CN108633065B - Data transmission method and corresponding user equipment - Google Patents

Abstract

The disclosure provides a data transmission method executed at a first User Equipment (UE) and a corresponding first UE. The method comprises the following steps: detecting a bypass control channel, PSCCH, transmitted by the second UE on one or more carriers; compensating a demodulation reference channel (PSSCH-RSRP) of the second UE according to the detected PSCCH on each carrier; determining available candidate single-subframe resources on each carrier according to the compensated PSSCH-RSRP; and transmitting the bypass data channel PSSCH with at least one of the determined available candidate single subframe resources on all carriers. The disclosure also provides two other methods performed at the first UE and the corresponding first UE.

Description

Data sending methods and corresponding user equipment

Technical field

The present disclosure relates to the field of communication technology. Specifically, the present disclosure relates to a data sending method and corresponding user equipment, such as in vehicle-to-external V2X communication.

Background technique

In the 3GPP standard, the direct communication link between the device and the device is called the sidelink. Similar to the uplink and downlink, there are also control channels and data channels on the sidelink. The former is called the bypass control channel. (PhysicalSidelink Control CHannel, PSCCH for short), the latter is called the bypass data channel (Physical SidelinkShared CHannel, PSSCH for short). PSCCH is used to indicate the time-frequency domain resource location, modulation and coding mode, and priority of data carried in PSSCH for PSSCH transmission. PSSCH is used to carry data.

Control information and data in Vehicle to Vehicle/Perdestrian/Infrastructure/Network (V2X for short) can be transmitted through the bypass. At this time, V2X communication includes two transmission modes, namely transmission mode 3 (Mode 3) and transmission mode 4 (Mode 4). For Mode 3, the PSCCH and PSSCH transmission resources of a UE (generally referred to as V2X UE in this article) are allocated by the evolved NodeB (eNB), and the UE receives the bypass sent by the eNB through the PDCCH or EPDCCH. Resource allocation indication to determine the transmission resources of PSCCH and PSSCH. In Mode 4, the transmission resources of PSCCH and PSSCH are autonomously selected by the UE based on the channel detection results. If the UE using Mode 4 has V2X data that needs to be sent in subframe n (that is, the V2X data packet arrives at the UE radio access layer no later than subframe n) and meets the conditions for resource selection or reselection, the UE will use the resource The time-frequency resources within the selection window [n+T1, n+T2] are regarded as candidate single subframe resources (the values of T1 and T2 are determined by the UE implementation, but they need to satisfy T1≤4, 20≤T2≤100), and then the UE Determine available candidate single subframe resources within the resource selection window. In the process of determining the available candidate single subframe resources, the UE first determines the time-frequency resource location and priority of the scheduled PSSCH by receiving the PSCCH sent by other UEs, and then further detects the demodulation reference channel received power of the scheduled PSSCH ( PSSCH-RSRP), and exclude resources with PSSCH-RSRP higher than the predetermined threshold (hereinafter referred to as resource selection step 2); the UE then calculates the average received energy (S-RSSI) of the remaining resources, and X% of the units with the lowest S-RSSI The frame resource is the available candidate single subframe resource (hereinafter referred to as resource selection step 3). In the 3GPP Rel-14 standard, the value of X is 20. It should be noted that the X% is the proportion of available candidate single subframe resources to all single subframe resources in the resource selection window. The UE will randomly select a resource from the available candidate single subframe resources as a sending resource.

In the 3GPP Rel-14 standard, the minimum data transmission delay that V2X communication can support is 20ms. However, this delay cannot meet the needs of all application scenarios in vehicle-to-external communication. For example, in the autonomous driving fleet (Platooning) application scenario, the sending delay requirement of some data packets is 10ms. For this reason, when Mode 4 UE determines the resource selection window during the resource selection or reselection process, the minimum value of T2 should not be greater than 10, thereby ensuring that the interval between the selected resource and the time when the resource selection or reselection is performed does not exceed the time of data transmission. Delay requirements. However, if there are multiple UEs performing resource selection or reselection in subframe n at the same time, the narrowed resource selection window will increase the possibility that the UE selects the same resource, resulting in a degradation of V2X system performance.

In addition, multi-antenna technology has not yet been used in current V2X communications, so the V2X equipment of 3GPP Rel-14 (called the first type of V2X UE) only uses a single antenna to transmit. However, in order to further improve the data reception success rate in V2X communication, multi-antenna technology is a very necessary choice. In order to ensure backward compatibility (for example, to enable the coexistence of Category 1 V2X UEs and LTE Rel-15 or subsequent versions of V2X devices (called Category 2 V2X UEs, which can use either multi-antenna transmission or single-antenna transmission) ), in the next evolution process of V2X, the second type of V2X UE that uses multi-antenna transmission may work with the UE that only uses a single antenna to transmit (including the first type of V2X UE and the second type of V2X UE that uses a single antenna to send) within the same resource pool. However, when the UE uses multiple antennas to transmit, the transmit power of each transmit antenna will be lower than when only a single antenna transmits. According to the current channel detection method of 3GPP Rel-14 UE, the PSSCH-RSRP detected by the first type V2X UE of the second type V2X UE using multi-antenna transmission is also higher than that of the UE using single antenna transmission in the same state (including single antenna transmission). The detected PSSCH-RSRP of the first type of V2X UE and the second type of V2X UE) is low, which causes the resources of the second type of V2X UE that uses multi-antenna transmission to be more easily preempted by the first type of V2X UE, ultimately affecting V2X communication. The performance of multi-antenna technology is fully realized.

From the above analysis, we can see that if we want to support applications with more demanding latency requirements and improve the data reception success rate in V2X communications, it is necessary to reduce the minimum data transmission delay in V2X communications and adopt multi-antenna transmission technology. However, there is currently no ideal solution to the many problems caused by this.

Contents of the invention

In order to solve the above problem, the present disclosure proposes to reduce the possibility that the resources of such UEs are occupied by compensating the PSSCH-RSRP of the second type of V2X UE that uses multi-antenna transmission.

Specifically, according to the first aspect of the present disclosure, a data sending method performed at the first user equipment UE is provided, and the method is performed at the first user equipment UE. The method includes: detecting the bypass control channel PSCCH sent by the second UE on one or more working carriers; and determining the demodulation reference channel received power PSSCH- of the second UE according to the detected PSCCH on each working carrier. RSRP to compensate; determine available candidate single subframe resources based on the compensated PSSCH-RSRP on each working carrier; and use at least one of the available candidate single subframe resources determined on one or more working carriers to send bypass data Channel PSSCH.

In some embodiments, the detected PSCCH includes at least one of the following: an indication that the second UE uses multiple antennas for transmission; or an indication of PSSCH-RSRP compensation for the second UE.

In some embodiments, determining available candidate single subframe resources on one or more carriers according to the comparison results includes: determining a specific proportion of single subframe resources within the resource selection window on each carrier as available candidate single subframe resources.

In some embodiments, using at least one of the determined available candidate single subframe resources to transmit the bypass data channel PSSCH includes: selecting an initial index value m of the modulation coding scheme MCS; based on min (m + d, 28) or min (m+d, 31) Determine the index value m' of the effective MCS, determine the transport block size index according to the mapping rule between m' and the predetermined MCS index value and the transport block size index, and determine the transport block size index based on m' and the predetermined MCS index value and The mapping rule of the modulation order determines the modulation order, wherein the value of d is configured or preconfigured by the base station; and transmits the PSSCH on at least one of the determined available candidate single subframe resources according to the determined transport block size index and the modulation order. .

In some embodiments, using the determined available candidate single subframe resources to send the bypass data channel PSSCH includes: selecting an initial index value m of the modulation and coding scheme MCS; and mapping the m and the predetermined MCS index value to the transport block size index. The rules determine the transport block size index, and determine the modulation order Q' according to m and the predetermined MCS index value and the modulation order mapping rule; and according to the determined transport block size index and Q on the determined available candidate single subframe resources Send data where Q=max(4,Q').

In some embodiments, the second UE supports multi-antenna transmission.

In some embodiments, determining the available candidate single subframe resources on one or more carriers according to the compensated PSSCH-RSRP includes: comparing the compensated PSSCH-RSRP with a predetermined threshold; and determining the available candidate single subframe resources according to the comparison result. .

In some embodiments, the first UE and the second UE are vehicle-to-external communication V2X devices that communicate directly with each other through a bypass connection.

According to a second aspect of the present disclosure, a data sending method performed at the first user equipment UE is provided, and the method is performed at the first user equipment UE. The method includes: detecting the bypass control channel PSCCH sent by the second UE on one or more carriers; adjusting a predetermined threshold according to the detected PSCCH on one or more carriers and comparing the PSSCH-RSRP with the adjusted predetermined The threshold is compared; the available candidate single subframe resources on each carrier are determined according to the comparison result; and the bypass data channel PSSCH is transmitted using at least one of the determined available candidate single subframe resources.

In some embodiments, the detected PSCCH contains a priority offset indication for indicating an actual priority of the second UE to transmit data and a priority of the second UE to be scheduled for data transmission. The offset, and adjusting the predetermined threshold according to the detected PSCCH includes: adjusting the predetermined threshold according to the priority offset indication.

In some embodiments, determining available candidate single subframe resources on one or more carriers according to the comparison results includes: determining a specific proportion of single subframe resources within each carrier resource selection window as available candidate single subframe resources.

In some embodiments, using at least one of the determined available candidate single subframe resources to transmit the bypass data channel PSSCH includes: selecting an initial index value m of the modulation coding scheme MCS; based on min (m + d, 28) or min (m+d, 31) Determine the index value m' of the effective MCS, determine the transport block size index according to the mapping rule between m' and the predetermined MCS index value and the transport block size index, and determine the transport block size index based on m' and the predetermined MCS index value and The mapping rule of the modulation order determines the modulation order, wherein the value of d is configured or preconfigured by the base station; and transmits the PSSCH on at least one of the determined available candidate single subframe resources according to the determined transport block size index and the modulation order. .

In some embodiments, using at least one of the determined available candidate single subframe resources to transmit the bypass data channel PSSCH includes: selecting an initial index value m of the modulation coding scheme MCS; The mapping rule of the size index determines the transport block size index, and determines the modulation order Q' according to m and the predetermined MCS index value and the modulation order mapping rule; and determines the available candidates according to the determined transport block size index and Q Data is sent on a single subframe resource, where Q=max(4, Q').

In some embodiments, the second UE supports multi-antenna transmission.

In some embodiments, the first UE and the second UE are vehicle-to-external communication V2X devices that communicate directly with each other through a bypass connection.

According to a third aspect of the present disclosure, a data sending method performed at the first user equipment UE is provided, and the method is performed at the first user equipment UE. The method includes: detecting the bypass control channel PSCCH sent by the second UE on one or more carriers; compensating the PSSCH-RSRP according to the detected PSCCH and adjusting the predetermined threshold on each working carrier; Compare the compensated PSSCH-RSRP with the adjusted predetermined threshold on the working carrier; determine available candidate single subframe resources based on the comparison results on each working carrier; and utilize the available candidate single subframe resources determined on one or more working carriers. At least one of the frame resources is used to transmit the bypass data channel PSSCH.

In some embodiments, compensating the PSSCH-RSRP according to the detected PSCCH includes: compensating the PSSCH-RSRP according to at least one of the following: an indication that the second UE uses multi-antenna transmission; or performing PSSCH on the second UE. -Indication of RSRP compensation.

In some embodiments, the detected PSCCH contains a priority offset indication for indicating an actual priority of the second UE to transmit data and a priority of the second UE to be scheduled for data transmission. The offset, and adjusting the predetermined threshold according to the detected PSCCH includes: adjusting the predetermined threshold according to the priority offset indication.

According to a fourth aspect of the present disclosure, a first user equipment UE is provided. The first UE includes: a transceiver; a processor; and a memory storing computer-executable instructions. When executed by the processor, the computer-executable instructions cause the first UE to execute the first solution and the second solution. and the method described in any one of the third embodiment.

According to a fifth aspect of the present disclosure, a computer storage medium is provided, storing computer-executable instructions. The computer-executable instructions, when executed by the processor of the first user equipment UE, cause the first UE to perform the method according to any one of the first solution, the second solution and the third solution.

According to the above-mentioned embodiments of the present disclosure, the present disclosure provides a new UE relative to the first type of V2X UE (as mentioned above, it can also be called the second type of V2X UE, supporting both single-antenna transmission and multi-antenna transmission) And the data sending method executed on the new UE can improve the performance of the V2X communication system with minor standard changes. Specifically, the new UE determines that the UE adopts multi-antenna transmission based on the PSCCH of the second type V2X UE (for example, the second type V2X UE using multi-antenna transmission) detected on one or more working carriers, and then the UE PSSCH-RSRP compensation or equivalent compensation (adjust the predetermined threshold compared with PSSCH-RSRP when determining available candidate resources), thereby reducing the possibility that the transmission resources of the second type of V2X UE using multi-antenna transmission are occupied. In addition, when the new UE has a small delay requirement for sending data and needs to reduce the resource selection window, the new UE can use a higher modulation and coding method to reduce the required single subframe resources, and use a method that increases possible candidate single subframe resources. Ratio, multi-carrier resource selection and other methods are used to increase the number of candidate single subframe resources available within the resource selection window to avoid the possibility of selecting the same resources between different UEs.

Description of the drawings

The above and/or additional aspects and advantages of the present disclosure will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

FIG. 1 shows a schematic flowchart of a data sending method 100 performed at a first user equipment UE according to an exemplary embodiment of the present disclosure;

Figure 2 shows a schematic flowchart of a data sending method 200 performed at a first user equipment UE according to an exemplary embodiment of the present disclosure;

Figure 3 shows a schematic flowchart of a data sending method 300 performed at a first user equipment UE according to an exemplary embodiment of the present disclosure;

Figure 4 shows a schematic flowchart of a data sending method 400 performed at the first UE according to an embodiment of the present disclosure;

Figure 5 shows a schematic flowchart of a data sending method 500 performed at the first UE according to an embodiment of the present disclosure;

Figure 6 shows a schematic structural diagram of a UE 600 according to an embodiment of the present disclosure.

Detailed ways

Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present disclosure and cannot be construed as limiting the present disclosure.

Those skilled in the art will understand that, unless expressly stated otherwise, the singular forms "a", "an", "the" and "the" used herein may also include the plural form. It should be further understood that the word "comprising" as used in the description of the present disclosure refers to the presence of stated features, integers, steps, operations, elements and/or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components and/or groups thereof. It will be understood that when we refer to an element being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Additionally, "connected" or "coupled" as used herein may include wireless connections or wireless couplings. As used herein, the term "and/or" includes all or any unit and all combinations of one or more of the associated listed items.

It can be understood by one of ordinary skill in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It should also be understood that terms, such as those defined in general dictionaries, are to be understood to have meanings consistent with their meaning in the context of the prior art, and are not to be used in an idealistic or overly descriptive manner unless specifically defined as here. to explain the formal meaning.

Those skilled in the art can understand that the "user equipment" and "UE" used here include both devices with wireless signal receivers, devices that only have wireless signal receivers without transmission capabilities, and devices with receiving and transmitting hardware. A device having receiving and transmitting hardware capable of conducting two-way communications over a two-way communication link. Such equipment may include: cellular or other communication equipment with a single line display or a multi-line display or a cellular or other communication equipment without a multi-line display; PCS (Personal Communications Service, personal communication system), which can combine voice, data Processing, fax and/or data communication capabilities; PDA (Personal Digital Assistant), which may include a radio frequency receiver, pager, Internet/Intranet access, web browser, notepad, calendar and/or GPS (Global Positioning System (Global Positioning System) receiver; a conventional laptop and/or palmtop computer or other device having and/or including a radio frequency receiver. As used herein, "User Equipment", "UE" may be portable, transportable, installed in a vehicle (air, maritime and/or land), or adapted and/or configured to operate locally, and/or In distributed form, operating anywhere on Earth and/or space. The "user equipment" and "UE" used here can also be communication terminals, Internet access terminals, music/video playback terminals, for example, they can be PDA, MID (Mobile Internet Device, mobile Internet device) and/or have music/video playback capabilities. Functional mobile phones can also be smart TVs, set-top boxes and other devices.

In order to support applications with more stringent latency requirements and improve data reception success rates, it is necessary to further reduce the minimum latency supported by the V2X system and further support multi-antenna transmission technology. In this case, in order to avoid an increase in the resource collision probability between different UEs (for example, between the first type of V2X UE and the second type of V2X UE that uses multi-antenna transmission) while reducing the probability of the second type of V2X UE that uses multi-antenna transmission. The possibility of resources being preempted by backward UEs (such as the first type of V2X UE), this disclosure proposes a direct communication method.

FIG. 1 shows a schematic flowchart of a data sending method 100 performed at a first user equipment UE according to an exemplary embodiment of the present disclosure. The first UE may directly communicate with the second UE, and the first UE and the second UE may be V2X devices that directly communicate with each other, ie, V2X UEs, for example, through a bypass connection. For example, the first UE may be a second type V2X UE, and may use either a single antenna or multiple antennas to transmit. The following describes exemplary embodiments of the present disclosure by taking a V2X communication scenario as an example. However, it should be understood that the method 100 can be applied to direct communication between any two UEs.

In step S110, the first UE detects the bypass control channel PSCCH sent by the second UE on one or more carriers. The detected PSCCH may include information such as the priority of the second UE to send data and the resource reservation interval of the second UE.

In an exemplary embodiment, the UE may detect the PSCCH sent by the second UE on only one carrier. If the UE has only one optional carrier, the carrier is the current working carrier of the UE.

Instead, the carrier is selected by the UE among multiple optional carriers. An optional method is that the carrier can be randomly selected by the UE from the plurality of optional carriers with equal probability. An optional method is that the carrier is randomly selected by the UE according to the carrier-specific probability Pc, where Pc is the probability of the UE selecting carrier c. Preferably, Pc is the channel occupancy ratio (CBRc) on carrier c and the above Function of CBR on multiple optional carriers, e.g. N is the number of optional carriers, CBR _i is the CBR on the i-th carrier, c=0, 1, 2,...N-1. Another optional method is that the carrier is randomly selected by the UE from m carriers with the lowest CBR among the multiple optional carriers, or the carrier is the carrier with the lowest CBR, where 1≤m≤N, the UE The value of m is determined by receiving signaling instructions from the eNB, preconfiguration or standard definition.

In an exemplary embodiment, the UE may detect the PSCCH transmitted by the second UE on each of all optional carriers.

In an exemplary embodiment, the detected PSCCH includes: an indication that the second UE uses multiple antennas for transmission; or an indication that PSSCH-RSRP compensation is performed on the second UE.

In step S120, the first UE compensates the PSSCH-RSRP of the second UE according to the detected PSCCH. When the detected PSCCH contains an indication that the second UE uses multiple antennas for transmission or an indication to perform PSSCH-RSRP compensation on the second UE, the first UE may compensate the PSSCH-RSRP of the second UE. That is to say, when the second UE is a second type of V2X UE that uses multi-antenna transmission, the first UE can compensate the PSSCH-RSRP of the second UE.

In step S130, the first UE determines available candidate single subframe resources according to the comparison result.

In an exemplary embodiment, step S130 may include: comparing the compensated PSSCH-RSRP with a predetermined threshold (step S131); and determining available candidate single subframe resources according to the comparison result (step S132).

Step S130 can be performed according to resource selection step 2 and resource selection step 3 in the existing standard. The main difference is that the PSSCH-RSRP is the compensated PSSCH-RSRP. Specifically, the corresponding single subframe resource may be excluded based on the comparison result between the compensated PSSCH-RSRP and the predetermined threshold. For example, single subframe resources whose PSSCH-RSRP is higher than a predetermined threshold can be excluded, and then X% single subframe resources with the lowest S-RSSI among the remaining resources are used as available candidate single subframe resources.

In the process of resource selection step 2 and resource selection step 3 in the existing standard, information indicated by the first UE high layer (referred to as high layer indication information for short) is also required.

The higher layer indication information may include: one or more carriers selected by the UE higher layer, the resource reservation interval P _{rsvp_TX assumed when determining available candidate single subframe resources on each carrier, and the assumed resource reservation interval P rsvp_TX} when determining available candidate single subframe resources on each carrier. One or more of the information including the number of subchannels L _subCH included in the single subframe resource, the data transmission priority prio _TX assumed when determining the available candidate single subframe resources on each carrier.

Here the single-subframe resource (single-subframe resource) R _{x, y} is the subframe L _subCH consecutive sub-channels starting from sub-channel x, where y represents the sub-frame/> Relative index within the resource pool.

If the first UE performs resource reselection in subframe n, the first UE shall select any subframe belonging to the resource pool within the resource selection window [n+T ₁ , n+T ₂ ] on one or more carriers. The consecutive L _{subCH sub} -channels are regarded as candidate single subframe resources, where T ₁ and T ₂ are determined by the UE implementation, and 0 < T ₁ ≤ a, b ≤ T ₂ ≤ c. The first UE may determine the values of a, b, and c according to base station configuration, preconfiguration, or standard definition. Preferably, if P _{rsvp_TX} is less than a specific value, the value of b should be no greater than P _{rsvp_TX} . Let the total number of single subframe resources on a single carrier be M _total , and the set of M _total candidate single subframe resources be S. It should be noted that the value of M _total on different carriers can be different.

Preferably, the value of L _subCH indicated by the higher layer should be within a specific range, which is defined by standards and configured or preconfigured by the base station. If P _{rsvp_TX} is less than a specific value, for example less than 20, the specific range is less than the optional range of L _subCH under the same situation defined in 3GPPRel-14.

If P _{rsvp_TX} is less than a specific value, such as less than 20, and if the UE currently only detects the PSCCH sent by the second UE on one carrier, it is finally determined that the proportion of available candidate single subframe resources to all single subframe resources in the resource selection window X% can be greater than The value (20%) defined in 3GPP Rel-14, thereby reducing the possibility of different UEs selecting the same resource. If the UE is currently detecting the PSCCH sent by the second UE on multiple carriers, the UE is on carrier c (c=0, 1, 2,...N-1, N is the number of carriers currently selected by the UE) The proportion X% of available candidate single subframe resources to all single subframe resources in the resource selection window can be equal to 20% × Rc, where Rc can be equal to 1, 1/N or Pc, and the specific value of Rc can be configured by the eNB. Configuration, or standard definition, so as to better balance the quality of available candidate resources and resource collision probability.

In step S140, the first UE transmits the bypass data channel PSSCH using at least one of the determined available candidate single subframe resources.

If the UE currently only detects the PSCCH sent by the second UE on one carrier, the first UE may randomly select a single subframe resource among the determined available candidate single subframe resources with medium probability for sending the PSSCH.

If the UE is currently detecting the PSCCH sent by the second UE on multiple carriers, according to an implementation manner of this application, the UE can finally determine all available candidate single subframe resources on all carriers and randomly select a single subframe resource for transmission with medium probability. PSSCH.

If the UE is currently detecting the PSCCH sent by the second UE on multiple carriers, according to another implementation manner of this application, the UE may first select a carrier c (0≤c≤N-1) among the multiple carriers, Then a single subframe resource is randomly selected from the available candidate single subframe resources on carrier c with medium probability for transmitting PSSCH. The UE can select carrier c according to the carrier-specific probability Sc, where Sc can be 1/N, or Pc, and the specific value can be configured by the eNB, pre-configured, or defined by the standard;

If the UE is currently detecting the PSCCH sent by the second UE on multiple carriers, according to another implementation manner of this application, the UE selects carrier c (0≤c≤ N-1), the channel quality of the available candidate single subframe resources may be at least one of the following information: the average S-RSSI on the available candidate single subframe resources estimated by the UE, the occupied available candidate single subframe resources estimated by the UE The priority of the UE to send data for each sub-channel, the PSSCH-RSRP of the UE that occupies each sub-channel in the available candidate single sub-frame resources estimated by the UE, the resource reservation of the UE that occupies each sub-channel in the available candidate single-sub-frame resources estimated by the UE cycle, etc. Preferably, in order to support the above operations, the UE physical layer should report at least one item of the above information to the higher layer.

The MCS may be selected by the first UE within a specific range. The specific range here is defined by standards and configured or pre-configured by the base station. Preferably, if P _{rsvp_TX} is less than a specific value, for example, less than 20, the specific range is less than the optional range of MCS defined in 3GPP Rel-14 under the same situation. Alternatively, the optional ranges of MCS are the same, but for the same MCS value, the modulation order adopted by the first UE is higher than the modulation order corresponding to the MCS defined in 3GPP Rel-14.

In an exemplary embodiment, step S140 includes: selecting the modulation and coding scheme MCS index value m; selecting the initial index value m of the modulation and coding scheme MCS; based on min(m+d, 28) or min(m+d, 31) Determine the index value m' of the effective MCS, determine the transport block size index according to the mapping rule between m' and the predetermined MCS index value and the transport block size index, and determine the transport block size index according to the mapping rule between m' and the predetermined MCS index value and the modulation order Modulation order, where the value of d is configured or preconfigured by the base station; and transmitting PSSCH on the determined available candidate single subframe resources according to the determined transport block size index and modulation order.

In another exemplary embodiment, step S140 includes: selecting an initial index value m of the modulation coding scheme MCS; determining the transport block size index according to m and the mapping rule between the predetermined MCS index value and the transport block size index, and determining the transport block size index according to m and the mapping rule of the predetermined MCS index value and the transport block size index. The predetermined MCS index value and the modulation order mapping rule determine the modulation order Q'; and send data on the determined available candidate single subframe resources according to the determined transport block size index and Q, where Q=max(4,Q ').

FIG. 2 shows a schematic flowchart of a data sending method 200 performed at the first user equipment UE according to an exemplary embodiment of the present disclosure. The first UE may directly communicate with the second UE, and the first UE and the second UE may be V2X devices that directly communicate with each other, ie, V2X UEs, for example, through a bypass connection. For example, the first UE may be a second type V2X UE, and may use either a single antenna or multiple antennas to transmit. The following describes exemplary embodiments of the present disclosure by taking the V2X communication scenario as an example. However, it should be understood that the method 200 can be applied to direct communication between any two UEs.

In step S210, the first UE detects the bypass control channel PSCCH sent by the second UE on one or more carriers. The detected PSCCH may include information such as the priority of the second UE to send data and the resource reservation interval of the second UE.

In an exemplary embodiment, the UE may detect the PSCCH sent by the second UE on only one carrier. If the UE has only one optional carrier, the carrier is the current working carrier of the UE.

Instead, the carrier is selected by the UE among multiple optional carriers. An optional method is that the carrier can be randomly selected by the UE from the plurality of optional carriers with equal probability. An optional method is that the carrier is randomly selected by the UE according to the carrier-specific probability Pc, where Pc is the probability of the UE selecting carrier c. Preferably, Pc is the channel occupancy ratio (CBRc) on carrier c and the above Function of CBR on multiple optional carriers, e.g. N is the number of optional carriers, CBR _i is the CBR on the i-th carrier, c=0, 1, 2,...N-1. Another optional method is that the carrier is randomly selected by the UE from m carriers with the lowest CBR among the multiple optional carriers, or the carrier is the carrier with the lowest CBR, where 1≤m≤N, the UE The value of m is determined by receiving signaling instructions from the eNB, preconfiguration or standard definition.

In an exemplary embodiment, the UE may detect the PSCCH transmitted by the second UE on each of all optional carriers.

In step S220, the first UE adjusts the predetermined threshold according to the detected PSCCH.

In an exemplary embodiment, the detected PSCCH contains a priority offset indication. The priority offset indication is used to indicate an offset between the actual priority of the second UE for transmitting data and the priority of the second UE for data transmission to be scheduled. Accordingly, step S220 may include adjusting the predetermined threshold according to the priority offset indication.

In step S230, the first UE compares the PSSCH-RSRP with the adjusted predetermined threshold.

Step S230 is similar to step S131, and can also be performed according to resource selection step 2 in the existing standard. The main difference between these two steps is that the PSSCH-RSRP in step S131 is compensated, while the predetermined threshold in step S230 is adjusted. That is to say, step S131 directly compensates PSSCH-RSRP, while step S230 equivalently compensates PSSCH-RSRP by adjusting a predetermined threshold. Therefore, the method of adjusting the predetermined threshold when determining available candidate resources can also be called equivalent compensation for PSSCH-RSRP.

In step S240, the first UE determines available candidate single subframe resources on each carrier according to the comparison result. Step S240 is similar to step S132, and can also be performed according to resource selection step 2 and resource selection step 3 in existing standards. Specifically, the corresponding single subframe resource may be excluded according to the comparison result. For example, single subframe resources whose PSSCH-RSRP is higher than a predetermined threshold can be excluded, and then X% single subframe resources with the lowest S-RSSI among the remaining resources are used as available candidate single subframe resources. If P _{rsvp_TX} is less than a specific value, such as less than 20, and if the UE currently only detects the PSCCH sent by the second UE on one carrier, it is finally determined that the proportion of available candidate single subframe resources to all single subframe resources in the resource selection window X% can be greater than The value (20%) defined in 3GPP Rel-14, thereby reducing the possibility of different UEs selecting the same resource. If the UE is currently detecting the PSCCH sent by the second UE on multiple carriers, the UE is on carrier (c=0, 1, 2,...N-1, N is the number of carriers currently selected by the UE) c The proportion X% of available candidate single subframe resources to all single subframe resources in the resource selection window can be equal to 20% × Rc, where Rc can be equal to 1, 1/N or Pc, and the specific value of Rc can be configured by the eNB. Configuration, or standard definition, so as to better balance the quality of available candidate resources and resource collision probability.

In step S250, the first UE transmits the bypass data channel PSSCH using at least one of the determined available candidate single subframe resources. The implementation of step S250 is basically the same as that of step S140.

In an exemplary embodiment, step S250 includes: selecting the initial index value m of the modulation and coding scheme MCS; determining the index value m' of the effective MCS based on min(m+d, 28) or min(m+d, 31), The transport block size index is determined according to the mapping rule between m' and the predetermined MCS index value and the transport block size index, and the modulation order is determined according to the mapping rule between m' and the predetermined MCS index value and the modulation order, where the value of d is given by The base station configures or pre-configures; and transmits the PSSCH on the determined available candidate single subframe resources according to the determined transport block size index and modulation order.

In another exemplary embodiment, step S250 includes: selecting an initial index value m of the modulation coding scheme MCS; determining the transport block size index according to m and the mapping rule between the predetermined MCS index value and the transport block size index, and determining the transport block size index according to m and the predetermined MCS index value and the transport block size index. The predetermined MCS index value and the modulation order mapping rule determine the modulation order Q'; and send data on the determined available candidate single subframe resources according to the determined transport block size index and Q, where Q=max(4,Q ').

FIG. 3 shows a schematic flowchart of a data sending method 300 performed at the first user equipment UE according to an exemplary embodiment of the present disclosure. The first UE may directly communicate with the second UE, and the first UE and the second UE may be V2X devices that directly communicate with each other, ie, V2X UEs, for example, through a bypass connection. For example, the first UE may be a second type V2X UE, and may use either a single antenna or multiple antennas to transmit. The following describes exemplary embodiments of the present disclosure by taking the V2X communication scenario as an example. However, it should be understood that the method 300 can be applied to direct communication between any two UEs.

In step S310, the first UE detects the bypass control channel PSCCH sent by the second UE on one or more carriers. The detected PSCCH may include information such as the priority of the second UE to send data and the resource reservation interval of the second UE.

In an exemplary embodiment, the UE may detect the PSCCH sent by the second UE on only one carrier. If the UE has only one optional carrier, the carrier is the current working carrier of the UE.

Instead, the carrier is selected by the UE among multiple optional carriers. An optional method is that the carrier can be randomly selected by the UE from the plurality of optional carriers with equal probability. An optional method is that the carrier is randomly selected by the UE according to the carrier-specific probability Pc, where Pc is the probability of the UE selecting carrier c. Preferably, Pc is the channel occupancy ratio (CBRc) on carrier c and the above Function of CBR on multiple optional carriers, e.g. N is the number of optional carriers, CBR _i is the CBR on the i-th carrier, c=0, 1, 2,...N-1. Another optional method is that the carrier is randomly selected by the UE from m carriers with the lowest CBR among the multiple optional carriers, or the carrier is the carrier with the lowest CBR, where 1≤m≤N, the UE The value of m is determined by receiving signaling instructions from the eNB, preconfiguration or standard definition.

In an exemplary embodiment, the UE may detect the PSCCH transmitted by the second UE on each of all optional carriers.

In an exemplary embodiment, the detected PSCCH includes: an indication that the second UE uses multiple antennas for transmission; or an indication that PSSCH-RSRP compensation is performed on the second UE. Alternatively, the detected PSCCH may also contain a priority offset indication.

In step S320, the first UE compensates the demodulation reference channel received power PSSCH-RSRP of the second UE and adjusts the predetermined threshold according to the detected PSCCH.

In an exemplary embodiment, the first UE may compensate the PSSCH-RSRP of the second UE according to the second UE's instruction to use multi-antenna transmission or the instruction to perform PSSCH-RSRP compensation on the second UE. That is to say, when the second UE is a second type of V2X UE that uses multi-antenna transmission, the first UE can compensate the PSSCH-RSRP of the second UE.

In another exemplary embodiment, the first UE may adjust the predetermined threshold according to the priority offset indication.

In step S330, the first UE compares the compensated PSSCH-RSRP with the adjusted predetermined threshold.

Step S330 is similar to steps S131 and S230, and can also be performed according to resource selection step 2 in the existing standard. The main difference is that the PSSCH-RSRP in step S330 is compensated and the predetermined threshold in step S330 is adjusted. That is to say, step S330 not only directly compensates the PSSCH-RSRP, but also performs equivalent compensation by adjusting a predetermined threshold.

In step S340, the first UE determines available candidate single subframe resources on each carrier according to the comparison result. Step S340 is similar to steps S132 and S240, and will not be described again here.

In an exemplary embodiment, step S340 includes: if P _{rsvp_TX} is less than a specific value, for example, less than 20, and if the UE currently only detects the PSCCH sent by the second UE on one carrier, finally determine the available candidate single subframe resource accounting resource selection. The proportion X% of all single subframe resources in the window can be greater than the value defined in 3GPP Rel-14 (20%), thereby reducing the possibility of different UEs selecting the same resource. If the UE is currently detecting the PSCCH sent by the second UE on multiple carriers, the UE is on carrier c (c=0, 1, 2,...N-1, N is the number of carriers currently selected by the UE) The proportion X% of available candidate single subframe resources to all single subframe resources in the resource selection window can be equal to 20% × Rc, where Rc can be equal to 1, 1/N or Pc, and the specific value of Rc can be configured by the eNB. Configuration, or standard definition, so as to better balance the quality of available candidate resources and resource collision probability. .

In step S350, the first UE transmits the bypass data channel PSSCH using at least one of the determined available candidate single subframe resources. The implementation of step S350 is basically the same as that of steps S140 and S250.

In an exemplary embodiment, step S350 includes: selecting the initial index value m of the modulation and coding scheme MCS; determining the index value m' of the effective MCS based on min(m+d, 28) or min(m+d, 31), The transport block size index is determined according to the mapping rule between m' and the predetermined MCS index value and the transport block size index, and the modulation order is determined according to the mapping rule between m' and the predetermined MCS index value and the modulation order, where the value of d is given by The base station configures or pre-configures; and transmits the PSSCH on the determined available candidate single subframe resources according to the determined transport block size index and modulation order.

In another exemplary embodiment, step S350 includes: selecting an initial index value m of the modulation coding scheme MCS; determining the transport block size index according to m and the mapping rule between the predetermined MCS index value and the transport block size index, and determining the transport block size index according to m and the mapping rule of the predetermined MCS index value and the transport block size index. The predetermined MCS index value and the modulation order mapping rule determine the modulation order Q'; and send data on the determined available candidate single subframe resources according to the determined transport block size index and Q, where Q=max(4,Q ').

According to the above method 100, method 200 or method 300, the first UE determines whether the second UE uses multi-antenna transmission based on the detected PSCCH on one or more carriers, or obtains the PSSCH-RSRP compensation indication, and then determines the second When the UE uses multiple antennas to transmit or when it obtains a PSSCH-RSRP compensation indication, PSSCH-RSRP compensation is used to reduce the possibility that the first UE selects the resources occupied by the second UE. In addition, when the delay requirement for the first UE to send data is small and the resource selection window needs to be reduced, the first UE can use a higher modulation and coding method to reduce the required single subframe resources and increase the number of possible candidate single subframes. The ratio of resources and other methods can increase the number of candidate single subframe resources available within the resource selection window, and ultimately avoid the possibility of selecting the same resources between different UEs. Since there is no need to change the first type of V2X UE, the above method 100 or 200 can improve the performance of the V2X communication system with minor standard changes.

In order to facilitate understanding of the present disclosure, the above technical solutions of the present disclosure will be further described below in combination with specific application situations and in the mode of interaction between devices as follows:

Embodiment 1

According to this embodiment, the first UE may determine whether to compensate or equivalently compensate the PSSCH-RSRP of the second UE that sends the PSCCH based on the detected PSCCH on one or more carriers, and then based on the compensated PSSCH-RSRP Determine available candidate single subframe resources. Preferably, the following operations are performed only when the UE is working in a specific resource pool configured by the eNB. For example, the specific resource pool is a transmission resource pool configured for 3GPP version 14Mode 3 UE.

FIG. 4 shows a schematic flowchart of a data sending method 400 performed at the first UE according to an embodiment of the present disclosure.

In step S410, the first UE detects the PSCCH on one or more carriers, and compensates or equivalently compensates the PSSCH-RSRP of the second UE that sends the PSCCH according to the detection result.

In this embodiment, the UE may detect the PSCCH sent by the second UE on only one carrier. If the UE has only one optional carrier, this carrier is the current working carrier of the UE.

Instead, the carrier is selected by the UE among multiple optional carriers. According to an implementation manner of this embodiment, the carrier is randomly selected by the UE with a medium probability among the multiple optional carriers. According to another implementation of this embodiment, the carrier is randomly selected by the UE according to the carrier-specific probability Pc, where Pc is the probability of the UE selecting carrier c. Preferably, Pc is the channel occupancy ratio (CBRc) on carrier c. and a function of CBR on the multiple optional carriers, for example, N is the number of optional carriers, CBR _i is the CBR on the i-th carrier, c=0, 1, 2,...N-1. According to another implementation of this embodiment, the carrier is randomly selected by the UE from the m carriers with the lowest CBR among the multiple optional carriers with medium probability, or the carrier is the carrier with the lowest CBR, where 1≤m≤N , the UE determines the value of m by receiving the eNB's signaling indication, preconfiguration or standard definition.

Through the above method, the UE can select a carrier with a low CBR with a greater probability.

In this embodiment, the UE may also detect the PSCCH sent by the second UE on each carrier of all optional carriers.

Whether the UE detects the PSCCH on one carrier or multiple carriers can be configured, pre-configured, defined by standards by the eNB, or determined by the UE according to specific rules, and is not further limited in this application.

Preferably, in this embodiment, the bit fields contained in the PSCCH and the number of bits contained in each bit field are the same as the PSCCH format 1 (SCI 1) currently defined in 3GPP Rel-14.

Preferably, if the second UE uses multiple antennas for transmission, the PSSCH-RSRP value of the second UE should be the average of the PSSCH-RSRP values measured on each transmitting antenna port. Preferably, the demodulation reference signal (DMRS) sequence of the second UE on each transmitting antenna port is the same, and the DMRS cyclic shift on the i-th antenna port is mod(CS ₀ +i*D, 12) , where CS ₀ represents the cyclic shift of DMRS on the 0th antenna port. The determination method of CS ₀ is the same as the definition in 3GPP Rel-14. The value of D is defined by the standard and configured or pre-configured by the base station, for example, D=3.

PSSCH-RSRP processing method 1 according to this embodiment:

The detected PSCCH contains an indication of whether the second UE uses multiple antennas for transmission. If the second UE adopts the multi-antenna transmission mode, the first UE compensates the PSSCH-RSRP of the second UE, or only when the first UE adopts the single-antenna transmission mode, the first UE compensates the PSSCH-RSRP of the second UE. . For example, if one or some bits in the detected reserved bit field in the PSCCH are 1, it means that the second UE uses multi-antenna transmission. If the first UE uses a single antenna to transmit, the first UE compensates the PSSCH-RSRP of the second UE by 3dB. Alternatively, the detected PSCCH may contain a direct or indirect indication of the number of transmit antenna ports. If the number of directly or indirectly indicated sending ports is N, then 10×log ₁₀ N dB is compensated based on the measured PSSCH-RSRP of the second UE.

Preferably, if the second UE adopts a single-antenna transmission mode and the first UE adopts a multi-antenna transmission mode, the first UE performs negative compensation on the PSSCH-RSRP of the second UE. For example, if one or some bits in the detected reserved bit field in the PSCCH are 0, it means that the second UE uses a single antenna for transmission. If the first UE uses multiple antennas to transmit, the first UE compensates the PSSCH-RSRP of the second UE by -3dB. Alternatively, the detected PSCCH may contain a direct or indirect indication of the number of transmit antenna ports. If the number of directly or indirectly indicated sending ports is N, then -10×log ₁₀ N dB is compensated based on the measured PSSCH-RSRP of the second UE.

PSSCH-RSRP processing method two according to this embodiment:

The detected PSCCH contains an indication of whether to perform PSSCH-RSRP compensation for the second UE. For example, specific 2 or 1 bits in the reserved bit field of PSCCH can be used for PSSCH-RSRP compensation indication. If it is 1 bit, 0 can be used to indicate that the second UE is not compensated for PSSCH-RSRP or the compensation is 0dB, 1 can be used to indicate that 3dB is compensated based on the measured PSSCH-RSRP, or 1 can be used to indicate that when the first UE adopts When transmitting from a single antenna, 3dB is compensated based on the measured PSSCH-RSRP. If it is 2 bits, the states 00, 01, 10, and 11 can be used to indicate that the compensation values are, for example, 0dB, 3dB, 6dB, and 9dB respectively, or the states 00, 01, 10, and 11 can be used when the first UE uses a single antenna to transmit. Respectively indicating the compensation values are, for example, 0dB, 3dB, 6dB and 9dB.

PSSCH-RSRP processing method three according to this embodiment:

There is an offset Δ (a value not less than zero) between the actual priority of the second UE sending data and the priority indicated in the PSCCH that schedules the sending data. The offset value can be determined by scheduling the sending data. Certain specific bit indications in the PSCCH are configured or pre-configured by the eNB. In addition, the PSCCH used to schedule the data transmission also indicates whether the second UE uses multi-antenna transmission. If the second UE uses multi-antenna transmission, when determining the available candidate resources, the first UE performs equivalent compensation on the PSSCH-RSRP of the second UE, or only when the first UE uses a single-antenna transmission mode, the first UE compensates the second UE for equal value. The UE’s PSSCH-RSRP is used for compensation. Specifically, the predetermined threshold is first adjusted by Δ, and then when the available candidate resources are determined, the PSSCH-RSRP of the second UE is compared with the adjusted predetermined threshold. PSSCH-RSRP processing method 3 can be used simultaneously with PSSCH-RSRP processing method 1 or PSSCH-RSRP processing method 2. In this case, the predetermined threshold is first adjusted by Δ, and then when the available candidate resources are determined, the second The UE's compensated PSSCH-RSRP is compared with the adjusted predetermined threshold.

Preferably, if the second UE uses a single antenna to transmit, when determining the available candidate resources, if the first UE uses multiple antennas to transmit, the first UE performs equivalent negative compensation on the PSSCH-RSRP of the second UE; specifically, first use ΔAdjust the predetermined threshold, and then compare the PSSCH-RSRP of the second UE with the adjusted predetermined threshold when determining available candidate resources.

PSSCH-RSRP processing method 3 can be used simultaneously with PSSCH-RSRP processing method 1 or PSSCH-RSRP processing method 2. In this case, the predetermined threshold is first adjusted by Δ, and then when the available candidate resources are determined, the second The UE's compensated PSSCH-RSRP is compared with the adjusted predetermined threshold.

PSSCH-RSRP processing method four according to this embodiment:

The detected PSCCH contains an indication of whether the second UE uses multi-antenna transmission. It is assumed that the value of the priority field contained in the PSCCH is prio _RX , and the data transmission priority of the first UE indicated by the high-level indication information of the first UE is prio _TX , the first UE compares PSSCH-RSRP with the predetermined threshold when determining available candidate resources. Compare; if both the first UE and the second UE adopt a single antenna transmission mode, then/> Represents the i-th SL-ThresPSSCH-RSRP in SL-ThresPSSCH-RSRP-List-r14 defined in 3GPP standard 36.331V14.1.0; if the second UE adopts multi-antenna transmission mode and the first UE adopts single-antenna transmission mode, then /> Indicates the i-th SL-ThresPSSCH-RSRP in SL-ThresPSSCH-RSRP-List-r15-1; if the second UE adopts a single-antenna transmission mode and the first UE adopts a multi-antenna transmission mode, then/> Indicates the i-th SL-ThresPSSCH-RSRP in SL-ThresPSSCH-RSRP-List-r15-2; if both the second UE and the first UE adopt the multi-antenna transmission mode, then/> Indicates the i-th SL-ThresPSSCH-RSRP in SL-ThresPSSCH-RSRP-List-r15-3, or indicates the i-th SL-ThresPSSCH-RSRP in SL-ThresPSSCH-RSRP-List-r14. Where i=prio _TX *8+prio _RX +1, SL-ThresPSSCH-RSRP-List-r15-1, SL-ThresPSSCH-RSRP-List-r15-2 and SL-ThresPSSCH-RSRP-List-r15-3 can be Redefined in the next version of 3GPP standard 36.331, moreover, the structures of SL-ThresPSSCH-RSRP-List-r15-1, SL-ThresPSSCH-RSRP-List-r15-2 and SL-ThresPSSCH-RSRP-List-r15-3 Same as SL-ThresPSSCH-RSRP-List-r14, through eNB configuration or pre-configuration, SL-ThresPSSCH-RSRP-List-r15-1, SL-ThresPSSCH-RSRP-List-r15-2, SL-ThresPSSCH-RSRP can be guaranteed -The value of the i-th SL-ThresPSSCH-RSRP in List-r15-3 and SL-ThresPSSCH-RSRP-List-r14 is not exactly the same. It should be noted that if both the second UE and the first UE adopt the multi-antenna transmission mode,/> Indicates the i-th SL-ThresPSSCH-RSRP in SL-ThresPSSCH-RSRP-List-r14, and there is no need to additionally define and configure SL-ThresPSSCH-RSRP-List-r15-3.

If PSSCH-RSRP processing method 1 or PSSCH-RSRP processing method 2 is adopted (that is, the detected PSCCH contains an instruction for the second UE to use multiple antennas to transmit or an instruction to perform PSSCH-RSRP compensation for the second UE), assuming that the PSCCH contains The value of the priority field is prio _RX , and the data transmission priority of the first UE indicated by the high-level indication information of the first UE is prio _TX , then the first UE will compensate the second UE when determining the available candidate resources. PSSCH-RSRP with predetermined threshold Compare. /> Represents the i-th SL-ThresPSSCH-RSRP in SL-ThresPSSCH-RSRP-List-r14 defined in 3GPP standard 36.331V14.1.0, where i=prio _TX *8+prio _RX +1.

If PSSCH-RSRP processing method 3 is adopted, assume that the value of the priority field contained in the PSCCH is prio _RX , and the data transmission priority of the first UE indicated by the high-level indication information of the first UE is prio _TX . If the second If the UE adopts the multi-antenna transmission mode, the first UE will compare the PSSCH-RSRP of the second UE with the predetermined threshold adjusted by Δ when determining the available candidate resources. Compare, or compare the PSSCH-RSRP of the second UE with the predetermined threshold adjusted by Δ only when the first UE uses a single antenna to transmit. Compare. /> Represents the i-th SL-ThresPSSCH-RSRP in SL-ThresPSSCH-RSRP-List-r14 defined in 3GPP standard 36.331V14.1.0, where i=prio _TX *8+(prio _RX -Δ)+1. In this case, for the second UE, preferably, prio _RX =prio′ _RX +Δ, where prio′ _RX represents the actual priority of the second UE in sending data. The value of Δ may be defined by the second UE according to the standard and determined by the base station configuration or pre-configuration. Preferably, in this case, if the first UE adopts a single-antenna transmission mode and the second UE adopts a multi-antenna transmission mode, the first UE compares the PSSCH-RSRP of the second UE with the Δ-adjusted value when determining the available candidate resources. predetermined threshold after Compare.

In other cases, the first UE does not compensate or equivalently compensate the PSSCH-RSRP of the second UE, or the compensation value and the threshold adjustment value (ie, Δ) are 0. The first UE performs resource selection step 2 in the same manner as defined by the 3GPP Rel-14 standard, that is, assuming that the value of the priority field contained in the PSCCH is prio _RX , and the data indicated by the high-layer indication information of the first UE is sent first The level is prio _TX , then the first UE compares the PSSCH-RSRP of the second UE with the predetermined threshold when determining the available candidate resources. Compare. /> Represents the i-th SL-ThresPSSCH-RSRP in SL-ThresPSSCH-RSRP-List-r14 defined in 3GPP standard 36.331 V14.1.0, where i=prio _TX *8+prio _RX +1.

In step S420, the first UE determines available candidate single subframe resources on each carrier according to the compensation or equivalent compensation result in step S410.

The first UE may continue to perform resource selection step 2 on each carrier in a manner defined in 3GPP Rel-14, and further perform resource selection step 3.

In step S430, the first UE selects a single subframe resource from available candidate single subframe resources of all carriers as a transmission resource.

Embodiment 2

According to this embodiment, the first UE may compensate or equivalently compensate the PSSCH-RSRP of the second UE based on the detected PSCCH on one or more carriers. The way in which the first UE determines whether to perform PSSCH-RSRP compensation or equivalent compensation and the method of performing compensation or equivalent compensation are the same as step S410, and will not be described again here. Alternatively, the first UE always performs resource selection step 2 according to the PSSCH-RSRP of the second UE, that is, the PSSCH-RSRP of the second UE is not compensated under any circumstances. For the first UE that sends data services with low latency requirements, for example, the latency requirement is less than 20, when determining available candidate resources, the proportion of the last remaining available candidate resources should be increased to reduce the probability of resource collision. Preferably, the following operations are performed only when the UE is working in a specific resource pool configured by the eNB. For example, the specific resource pool is a transmission resource pool configured for 3GPP version 14Mode 3 UE.

FIG. 5 shows a schematic flowchart of a data sending method 500 performed at the first UE according to an embodiment of the present disclosure.

In step S510, the first UE detects the PSCCH sent by the second UE on one or more carriers, and determines the PSSCH-RSRP of the second UE.

The manner in which the UE determines the one or more carriers is the same as in Embodiment 1, and will not be described again here.

The first UE determines whether to compensate or equivalently compensate the PSSCH-RSRP of the second UE according to the standard definition and the base station configuration or preconfiguration.

If the first UE needs to compensate or equivalently compensate the PSSCH-RSRP of the second UE, the operation mode of the first UE is the same as step S410, which will not be described again here. On the contrary, the first UE always performs resource selection step 2 according to the PSSCH-RSRP of the second UE.

In step S520, the first UE determines available candidate single subframe resources on each carrier, and selects one resource from the available candidate single subframe resources on all carriers as a transmission resource.

In this embodiment, if the first UE always determines the available candidate resources according to the PSSCH-RSRP of the second UE, or if the first UE adopts the PSSCH-RSRP processing method one or two in the first embodiment, it is assumed that in the detected PSCCH The value of the included priority field is prio _RX , and the data transmission priority indicated by the high-layer indication information of the first UE is prio _TX . When the first UE determines the available candidate resources, if it satisfies the PSSCH-RSRP processing method one or In the PSSCH-RSRP processing method, if the PSSCH-RSRP of the second UE is compensated, the compensated PSSCH-RSRP of the second UE is compared with the predetermined threshold. Compare. Then, the first UE excludes single subframe resources larger than the predetermined threshold from the set S. If the remaining resources in set S are less than X%, the first UE will/> Increase Y dB and re-perform the above comparison operation until the remaining resources in S are not less than X%, or/> The improvement amplitude is greater than (z-high amplitude) dB.

In this embodiment, if the first UE adopts PSSCH-RSRP processing method 3 in Embodiment 1, it is assumed that the value of the priority field contained in the detected PSCCH is prio _RX , and the high-layer indication information of the first UE indicates The data transmission priority is prio _TX . When the first UE determines the available candidate resources, if it meets the conditions for equal compensation for the PSSCH-RSRP of the second UE in the PSSCH-RSRP processing method 3, the second UE's PSSCH-RSRP will be compensated equally. PSSCH-RSRP and adjusted predetermined threshold Compare. /> Represents the i-th SL-ThresPSSCH-RSRP in SL-ThresPSSCH-RSRP-List-r14 defined in 3GPP standard 36.331 V14.1.0, where i=prio _TX *8+(prio _RX -Δ)+1. If the remaining resources in the last set S are less than X%, the first UE will/> Increase Y dB and re-perform the above comparison operation until the resources remaining in S are no less than X%, or/> The improvement amplitude is greater than (z-high amplitude) dB. Y is a specific value, defined by the standard, base station configuration or pre-configuration. For example, if the value of P _{rsvp_TX} is less than 20, Y is 2dB or 1dB. z is a specific value, defined by the standard, base station configuration or pre-configuration, for example, z is equal to 3.

In this embodiment, if the first UE adopts PSSCH-RSRP processing method 3 in Embodiment 1, it is assumed that the value of the priority field contained in the detected PSCCH is prio _RX , and the high-layer indication information of the first UE indicates The data transmission priority is prio _TX . When the first UE determines the available candidate resources, if it meets the conditions for equivalent negative compensation to the PSSCH-RSRP of the second UE in PSSCH-RSRP processing method 3, the second UE will PSSCH-RSRP and predetermined threshold adjusted by Δ To compare,/> Represents the i-th SL-ThresPSSCH-RSRP in SL-ThresPSSCH-RSRP-List-r14 defined in 3GPP standard 36.331 V14.1.0, where i=(prio _TX +Δ)*8+prio _RX +1. If the remaining resources in the final set S are less than X%, the first UE will/> Increase Y dB and re-perform the above comparison operation until the resources remaining in S are no less than X%, or/> The improvement amplitude is greater than (z-high amplitude) dB. Y is a specific value, defined by the standard, base station configuration or pre-configuration. For example, if the value of P _{rsvp_TX} is less than 20, Y is 2dB or 1dB. z is a specific value, defined by the standard, base station configuration or pre-configuration, for example, z is equal to 3.

In this embodiment, if the first UE adopts PSSCH-RSRP processing method 4 in Embodiment 1, it is assumed that the value of the priority field contained in the detected PSCCH is prio _RX , and the high-layer indication information of the first UE indicates The data transmission priority is prio _TX . When determining the available candidate resources, the first UE compares the PSSCH-RSRP of the second UE with the predetermined threshold. For comparison, according to the rules defined in PSSCH-RSRP processing method 4 in Embodiment 1, and the transmission methods of the first UE and the second UE,/> The value represents in SL-ThresPSSCH-RSRP-List-r15-1, SL-ThresPSSCH-RSRP-List-r15-2, SL-ThresPSSCH-RSRP-List-r15-3 or SL-ThresPSSCH-RSRP-List-r14 The i-th SL-ThresPSSCH-RSRP, where i=prio _TX *8+prio _RX +1. If the remaining resources in the last set S are less than X%, the first UE will/> Increase Y dB and re-perform the above comparison operation until the resources remaining in S are no less than X%, or/> The improvement amplitude is greater than (z-high amplitude) dB. Y is a specific value, defined by the standard, base station configuration or pre-configuration. For example, if the value of P _{rsvp_TX} is less than 20, Y is 2dB or 1dB. z is a specific value, defined by the standard, base station configuration or pre-configuration, for example, z is equal to 3.

Preferably, it is assumed that the high-layer indication information of the first UE includes the resource reservation interval P _{rsvp_TX} assumed when determining the available candidate single subframe resources. If the value of P _{rsvp_TX} is less than 20, if the UE currently only detects the transmission of the second UE on one carrier. PSCCH, then it is finally determined that the proportion X% of available candidate single subframe resources to all single subframe resources in the resource selection window can be greater than the value (20%) defined in 3GPP Rel-14, for example, 30% or 40%. Alternatively, X% can be 20/P _{rsvp_TX} × 20%. Alternatively, X% may be a base station configured or preconfigured value. In this way, the possibility of different UEs selecting the same resources can be reduced. If the UE is currently detecting the PSCCH sent by the second UE on multiple carriers, the UE is on carrier c (c=0, 1, 2,...N-1, N is the number of carriers currently selected by the UE) The proportion X% of available candidate single subframe resources to all single subframe resources in the resource selection window can be equal to 20% × Rc, where Rc can be equal to 1, 1/N or Pc, and the specific value of Rc can be configured by the eNB. Configuration, or standard definition, so as to better balance the quality of available candidate resources and resource collision probability.

The first UE should further perform resource selection step 3, and the proportion of available candidate single subframe resources finally determined on each carrier should not be less than min{X%, X'%}, where The proportion of remaining single subframe resources after that.

In step S530, the first UE sends the PSSCH on the selected single subframe resource according to the determined modulation and coding method.

Embodiment 3

According to this embodiment, step S530 in Embodiment 2 may further include determining the transport block size index ( _ITBS ) and modulation order, thereby ensuring that when P _{rsvp_TX} is less than 20, the MCS or modulation order of the first UE is higher than the same Under the condition that the first UE with P _{rsvp_TX} not less than 20 can finally increase the number of single subframe resources in the resource selection window and reduce the possibility of resource collision between different UEs. Preferably, the following operations are performed only when the UE is working in a specific resource pool configured by the eNB. For example, the specific resource pool is a transmission resource pool configured for 3GPP version 14Mode 3 UE.

Two exemplary implementations of transport block size index ( _ITBS ) and modulation order are introduced in detail below.

In the first implementation, the first UE selects the initial index value m of the MCS within the MCS range determined by the existing standard, and then uses min(m+d, 28) or min(m+d, 31) to determine the effective MCS The index value m' determines the transport block size index according to the mapping rule between m' and the predetermined MCS index value (for example, as defined by the current standard) and the transport block size index, and determines the transport block size index based on m' and the predetermined MCS index value and the modulation order. The modulation order is determined by the mapping rule of the number, where the value of d is configured or pre-configured by the base station.

In the second implementation, the first UE selects an initial index value m of the MCS within the MCS range determined by the existing standard, and then uses m and the predetermined MCS index value (for example, as defined by the current standard) with the transport block size index The transport block size index is determined based on the mapping rule of ( _ITBS ), and the modulation order Q' is determined based on m and the predetermined MCS index value and the modulation order mapping rule. Finally, the selected single subframe resource is selected based on the determined _ITBS and Q. Send data on, where Q=max(4, Q').

The structure of a UE according to an embodiment of the present disclosure will be described below with reference to FIG. 6 . Figure 6 shows a schematic structural diagram of a UE 600 according to an embodiment of the present disclosure. UE 600 may be in direct communication with a second UE, for example, both may be V2X devices communicating directly with each other over a bypass connection. For example, the UE 600 may be the first UE as described above (either a second type V2X UE supporting single-antenna transmission or a second type V2X UE supporting multi-antenna transmission). The second UE may be a second type of V2X UE supporting multi-antenna transmission. UE 600 may perform the methods described with reference to Figures 1-5.

As shown in Figure 6, the UE 600 includes a transceiver 601 for external communication; a processing unit or processor 603, which may be a single unit or a combination of multiple units for performing different steps of the method; a memory 605 , computer-executable instructions are stored therein, which when executed by the processor 603, cause the UE 600 to perform the following operations corresponding to the method 100: detecting the bypass control channel sent by the second UE on one or more carriers PSCCH; compensate the demodulation reference channel received power PSSCH-RSRP of the second UE according to the detected PSCCH on each carrier; determine available candidate single subframe resources according to the compensated PSSCH-RSRP; and via the transceiver 601 The bypass data channel PSSCH is transmitted using at least one of the determined available candidate single subframe resources on all carriers.

In an exemplary embodiment, the UE may detect the PSCCH sent by the second UE on only one carrier. If the UE has only one optional carrier, the carrier is the current working carrier of the UE.

Instead, the carrier is selected by the UE among multiple optional carriers. An optional method is that the carrier can be randomly selected by the UE from the plurality of optional carriers with equal probability. An optional method is that the carrier is randomly selected by the UE according to the carrier-specific probability Pc, where Pc is the probability of the UE selecting carrier c. Preferably, Pc is the channel occupancy ratio (CBRc) on carrier c and the above Function of CBR on multiple optional carriers, e.g. N is the number of optional carriers, CBR _i is the CBR on the i-th carrier, c=0, 1, 2,...N-1. Another optional method is that the carrier is randomly selected by the UE from m carriers with the lowest CBR among the multiple optional carriers, or the carrier is the carrier with the lowest CBR, where 1≤m≤N, the UE The value of m is determined by receiving signaling instructions from the eNB, preconfiguration or standard definition.

In an exemplary embodiment, the UE may detect the PSCCH transmitted by the second UE on each of all optional carriers.

In an exemplary embodiment, the detected PSCCH includes at least one of the following: an indication that the second UE uses multiple antennas for transmission; or an indication that PSSCH-RSRP compensation is performed on the second UE.

In an exemplary embodiment, determining the available candidate single subframe resources according to the comparison result includes: if the UE currently only detects the PSCCH sent by the second UE on one carrier, determining that greater than 20% of the single subframe resources in the resource selection window are available. Candidate single subframe resources, if the UE currently detects the PSCCH sent by the second UE on multiple carriers, the UE finally determines on carrier c that the proportion of available candidate single subframe resources to all single subframe resources in the resource selection window X% is equal to 20% ×Rc, where Rc is equal to 1,1/N or Pc, c=0,1,2,...N-1.

In an exemplary embodiment, transmitting the bypass data channel PSSCH using the determined available candidate single subframe resources includes: selecting an initial index value m of the modulation and coding scheme MCS; based on min(m+d, 28) or min(m +d, 31) Determine the index value m' of the effective MCS, determine the transport block size index according to the mapping rule between m' and the predetermined MCS index value and the transport block size index, and determine the transport block size index based on m' and the predetermined MCS index value and the modulation order The modulation order is determined based on the mapping rule of the number, where the value of d is configured or preconfigured by the base station; and the PSSCH is sent on the determined available candidate single subframe resources according to the determined transport block size index and modulation order.

In an exemplary embodiment, transmitting the bypass data channel PSSCH using at least one of the available candidate single subframe resources determined on all carriers includes: selecting an initial index value m of the modulation coding scheme MCS; according to m and a predetermined The transport block size index is determined based on the mapping rule between the MCS index value and the transport block size index, and the modulation order Q' is determined based on m and the predetermined mapping rule between the MCS index value and the modulation order; and the modulation order Q' is determined based on the determined transport block size index and Q Data is sent on the determined available candidate single subframe resources, where Q=max(4, Q').

In an exemplary embodiment, determining the available candidate single subframe resources according to the compensated PSSCH-RSRP includes: comparing the compensated PSSCH-RSRP with a predetermined threshold; and determining the available candidate single subframe resources according to the comparison result.

The memory 605 may also store computer-executable instructions that, when executed by the processor 603, cause the UE 600 to perform the following operations corresponding to the method 200: detecting a bypass transmitted by the second UE on one or more carriers. control channel PSCCH; adjust the predetermined threshold according to the detected PSCCH on each carrier and compare PSSCH-RSRP with the adjusted predetermined threshold; determine available candidate single subframe resources according to the comparison results; and utilize the transceiver 601 via the transceiver 601 The bypass data channel PSSCH is transmitted using at least one of the determined available candidate single subframe resources on all carriers.

In an exemplary embodiment, the detected PSCCH contains a priority offset indication for indicating the actual priority of the second UE to transmit data and the priority of the second UE to be scheduled for data transmission. and adjusting the predetermined threshold according to the detected PSCCH includes: adjusting the predetermined threshold according to the priority offset indication.

In an exemplary embodiment, determining the available candidate single subframe resources according to the comparison result includes: if the UE currently only detects the PSCCH sent by the second UE on one carrier, determining that greater than 20% of the single subframe resources in the resource selection window are available. Candidate single subframe resources. If the UE currently detects the PSCCH sent by the second UE on multiple carriers, the UE finally determines on carrier c that the proportion of available candidate single subframe resources to all single subframe resources in the resource selection window X% is equal to 20% × Rc, where Rc Equal to 1,1/N or Pc,c=0,1,2,...N-1.

In an exemplary embodiment, transmitting the bypass data channel PSSCH using at least one of the available candidate single subframe resources determined on all carriers includes: selecting an initial index value m of the modulation coding scheme MCS; based on min(m+ d, 28) or min (m + d, 31) determines the index value m' of the effective MCS, determines the transport block size index according to the mapping rule between m' and the predetermined MCS index value and the transport block size index, and determines the transport block size index according to m' and The mapping rule between the predetermined MCS index value and the modulation order determines the modulation order, where the value of d is configured or preconfigured by the base station; and based on the determined transport block size index and modulation order on the determined available candidate single subframe resources Send PSSCH.

In an exemplary embodiment, using the determined available candidate single subframe resources to transmit the bypass data channel PSSCH includes: selecting an initial index value m of the modulation and coding scheme MCS; according to m and the predetermined MCS index value and the transport block size index Determine the transport block size index according to the mapping rule, and determine the modulation order Q' according to m and the predetermined MCS index value and the modulation order mapping rule; and determine the available candidate single subframe according to the determined transport block size index and Q. Send data on the resource, where Q=max(4, Q').

The memory 605 may also store computer-executable instructions that, when executed by the processor 603, cause the UE 600 to perform the following operations corresponding to the method 300: detecting on one or more carriers sent by the second UE. Bypass the control channel PSCCH; compensate the demodulation reference channel received power PSSCH-RSRP of the second UE according to the detected PSCCH on each carrier and adjust the predetermined threshold; combine the compensated PSSCH-RSRP with the adjusted compare with a predetermined threshold; determine available candidate single subframe resources according to the comparison result; and transmit the bypass data channel PSSCH via the transceiver 601 using at least one of the determined available candidate single subframe resources on all carriers.

In an exemplary embodiment, compensating the PSSCH-RSRP according to the detected PSCCH includes: compensating the PSSCH-RSRP according to at least one of the following: an indication that the second UE uses multi-antenna transmission; or for the second UE Instructions to perform PSSCH-RSRP compensation.

In an exemplary embodiment, the detected PSCCH contains a priority offset indication for indicating the actual priority of the second UE to transmit data and the priority of the second UE to be scheduled for data transmission. and adjusting the predetermined threshold according to the detected PSCCH includes: adjusting the predetermined threshold according to the priority offset indication.

The present disclosure also provides at least one computer storage medium in the form of non-volatile or volatile memory, such as electrically erasable programmable read-only memory (EEPROM), flash memory, and hard drives. The computer-executable instructions, when executed by processor 603, cause UE 600 to perform actions such as the processes previously described in connection with Figures 1-5.

The processor may be a single CPU (Central Processing Unit), but may also include two or more processors. For example, a processor may include a general-purpose microprocessor; an instruction set processor and/or an associated chipset; and/or a special-purpose microprocessor (eg, an application specific integrated circuit (ASIC)). The processor may also include onboard memory for caching purposes. For example, the computer storage medium may be flash memory, random access memory (RAM), read only memory (ROM), or EEPROM.

According to the above-mentioned embodiments of the present disclosure, the present disclosure provides a new UE relative to the first type of V2X UE (as mentioned above, it can also be called the second type of V2X UE, supporting both single-antenna transmission and multi-antenna transmission) And the method executed on the new UE for direct communication with the second type of V2X UE using multi-antenna transmission can improve the performance of the V2X communication system with minor standard changes. Specifically, the new UE determines that the UE uses multi-antenna transmission based on the detected PSCCH of the second type of V2X UE, and then compensates or equivalently compensates the UE's PSSCH-RSRP (adjustment is performed with PSSCH-RSRP when determining available candidate resources). predetermined threshold for comparison), thereby reducing the possibility that the transmission resources of the second type of V2X UE using multi-antenna transmission are occupied. In addition, when the new UE has a small delay requirement for sending data and needs to reduce the resource selection window, the new UE can use a higher modulation and coding method to reduce the required single subframe resources, and use a method that increases possible candidate single subframe resources. The number of candidate single subframe resources available within the resource selection window is increased by proportional and other methods to avoid the possibility of selecting the same resources between different UEs.

It will be understood by those skilled in the art that the present disclosure includes devices for performing one or more of the operations described in the present disclosure. These devices may be specially designed and manufactured for the required purposes, or they may include devices known from general purpose computers. These devices have computer programs stored within them that are selectively activated or reconfigured. Such computer program may be stored on a device (eg, computer) readable medium or in any type of medium suitable for storing electronic instructions and respectively coupled to a bus, including, but not limited to, any Types of disks (including floppy disks, hard disks, optical disks, CD-ROMs, and magneto-optical disks), ROM (Read-Only Memory, read-only memory), RAM (Random Access Memory, random memory), EPROM (Erasable ProgrammableRead-Only Memory, Erasable programmable read-only memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash memory, magnetic card or light card. That is, readable media includes any medium that stores or transmits information in a form that can be read by a device (eg, a computer).

It will be understood by those skilled in the art that computer program instructions may be used to implement each block in the structural diagrams and/or block diagrams and/or flow diagrams, and combinations of blocks in the structural diagrams and/or block diagrams and/or flow diagrams. . Those skilled in the art can understand that these computer program instructions can be provided to a processor of a general-purpose computer, a professional computer or other programmable data processing methods for implementation, so that the present invention is executed by the processor of a computer or other programmable data processing methods. The solutions specified in a block or blocks of the disclosed structural diagram and/or block diagram and/or flow diagram are disclosed.

Those skilled in the art can understand that the steps, measures, and solutions in the various operations, methods, and processes that have been discussed in this disclosure can be alternated, changed, combined, or deleted. Further, other steps, measures, and solutions in the various operations, methods, and processes that have been discussed in this disclosure may also be alternated, changed, rearranged, decomposed, combined, or deleted. Furthermore, the steps, measures, and solutions in the various operations, methods, and processes disclosed in the present disclosure in the prior art can also be replaced, changed, rearranged, decomposed, combined, or deleted.

The above are only some of the embodiments of the present disclosure. It should be noted that those of ordinary skill in the art can also make several improvements and modifications without departing from the principles of the present disclosure. These improvements and modifications can also be made. should be regarded as the scope of protection of this disclosure.

Claims (16)

1. A data sending method, the method is executed at the first user equipment UE, the method includes: Detect the bypass control channel PSCCH sent by the UE on one or more carriers; Compensate the demodulation reference channel received power PSSCH-RSRP of the UE according to the detected PSCCH on each carrier; Determine available candidate single subframe resources based on the compensated PSSCH-RSRP on each carrier; and transmitting the bypass data channel PSSCH using at least one of the determined available candidate single subframe resources on all carriers, The detected PSCCH includes an indication that the UE uses multiple antennas for transmission. 2. The method according to claim 1, wherein the detected PSCCH further includes an indication of PSSCH-RSRP compensation for the first UE. 3. The method according to claim 1 or 2, wherein determining available candidate single subframe resources according to the compensated PSSCH-RSRP includes: If the first UE currently only detects the PSCCH sent by the second UE on one carrier, determine that greater than 20% of single subframe resources within the resource selection window are available candidate single subframe resources; If the first UE currently detects the PSCCH sent by the second UE on multiple carriers, determine the single subframe resources of 20%×Rc within the resource selection window as available candidate single subframe resources, where Rc is equal to 1,1/N or Pc,N is the number of carriers currently selected by the UE and N is a natural number greater than 1, Pc is the probability that the first UE selects carrier c and CBR _i is the channel occupancy ratio CBR on the i-th carrier, CBR _c is the CBR on carrier c, c=0, 1, 2,...N-1. 4. The method according to claim 1 or 2, wherein transmitting the bypass data channel PSSCH using the determined available candidate single subframe resources includes: Select the initial index value m of the modulation coding method MCS; Determine the index value m' of the effective MCS based on min(m+d, 28) or min(m+d, 31), and determine the transport block size index according to the mapping rule between m' and the predetermined MCS index value and the transport block size index, And determine the modulation order according to the mapping rule between m' and the predetermined MCS index value and the modulation order, where the value of d is configured or preconfigured by the base station; and The PSSCH is sent on the determined available candidate single subframe resources according to the determined transport block size index and modulation order. 5. The method according to claim 1 or 2, wherein transmitting the bypass data channel PSSCH using the determined available candidate single subframe resources includes: Select the initial index value m of the modulation coding method MCS; Determine the transport block size index according to the mapping rule between m and the predetermined MCS index value and the transport block size index, and determine the modulation order Q’ according to the mapping rule between m and the predetermined MCS index value and the modulation order; and Data is sent on the determined available candidate single subframe resources according to the determined transport block size index and modulation order Q, where Q=max(4, Q'). 6. A data sending method, the method is executed at the first user equipment UE, the method includes: Detect the bypass control channel PSCCH sent by the second UE on one or more carriers; Adjust the predetermined threshold based on the detected PSCCH on each carrier; Compare the demodulation reference channel received power PSSCH-RSRP of the second UE with the adjusted predetermined threshold; Determine available candidate single subframe resources based on the comparison results; and transmitting the bypass data channel PSSCH using at least one of the determined available candidate single subframe resources on all carriers, Wherein, the detected PSCCH contains a priority offset indication, used to indicate an offset between the actual priority of the second UE to send data and the priority of the second UE to be scheduled for data transmission, and Adjusting the predetermined threshold according to the detected PSCCH includes: adjusting the predetermined threshold according to the priority offset indication. 7. The method according to claim 6, wherein determining the available candidate single subframe resources according to the comparison result includes: If the first UE currently only detects the PSCCH sent by the second UE on one carrier, determine that greater than 20% of single subframe resources within the resource selection window are available candidate single subframe resources; If the first UE currently detects the PSCCH sent by the second UE on multiple carriers, determine the single subframe resources of 20%×Rc within the resource selection window as available candidate single subframe resources, where Rc is equal to 1,1/N or Pc,N is the number of carriers currently selected by the UE and N is a natural number greater than 1, Pc is the probability that the first UE selects carrier c and CBR _i is the channel occupancy ratio CBR on the i-th carrier, CBR _c is the CBR on carrier c, c=0, 1, 2,...N-1. 8. The method according to claim 6 or 7, wherein transmitting the bypass data channel PSSCH using the determined available candidate single subframe resources includes: Select the initial index value m of the modulation coding method MCS; Determine the index value m' of the effective MCS based on min(m+d, 28) or min(m+d, 31), and determine the transport block size index according to the mapping rule between m' and the predetermined MCS index value and the transport block size index, And determine the modulation order according to the mapping rule between m' and the predetermined MCS index value and the modulation order, where the value of d is configured or preconfigured by the base station; and The PSSCH is sent on the determined available candidate single subframe resources according to the determined transport block size index and modulation order. 9. The method according to claim 6 or 7, wherein transmitting the bypass data channel PSSCH using the determined available candidate single subframe resources includes: Select the initial index value m of the modulation coding method MCS; Determine the transport block size index according to the mapping rule between m and the predetermined MCS index value and the transport block size index, and determine the modulation order Q’ according to the mapping rule between m and the predetermined MCS index value and the modulation order; and Data is sent on the determined available candidate single subframe resources according to the determined transport block size index and modulation order Q, where Q=max(4, Q'). 10. A data sending method, the method is executed at the first user equipment UE, the method includes: Detect the bypass control channel PSCCH sent by the second UE on one or more carriers; Compensate the demodulation reference channel received power PSSCH-RSRP of the second UE according to the detected PSCCH on each carrier and adjust the predetermined threshold; Compare the compensated PSSCH-RSRP with the adjusted predetermined threshold; Determine available candidate single subframe resources based on the comparison results; and The bypass data channel PSSCH is transmitted using the determined available candidate single subframe resources on all carriers, Wherein, compensating the PSSCH-RSRP according to the detected PSCCH includes compensating the PSSCH-RSRP according to the instruction of the second UE to use multi-antenna transmission. 11. The method of claim 10, wherein the compensating the PSSCH-RSRP according to the detected PSCCH further comprises: compensating the PSSCH-RSRP according to an instruction to perform PSSCH-RSRP compensation on the second UE. 12. The method according to claim 10 or 11, wherein the detected PSCCH contains a priority offset indication for indicating that the actual priority of the second UE to send data is different from that of the second UE to be scheduled. The offset between the priorities of data transmission, and adjusting the predetermined threshold according to the detected PSCCH includes: adjusting the predetermined threshold according to the priority offset indication. 13. A data sending method, the method is executed at the first user equipment UE, the method includes: Detect the bypass control channel PSCCH sent by the second UE on one or more carriers; Compensate the demodulation reference channel received power PSSCH-RSRP of the second UE according to the detected PSCCH on each carrier and adjust the predetermined threshold; Compare the compensated PSSCH-RSRP with the adjusted predetermined threshold; Determine available candidate single subframe resources based on the comparison results; and The bypass data channel PSSCH is transmitted using the determined available candidate single subframe resources on all carriers, Wherein, the detected PSCCH contains a priority offset indication, used to indicate an offset between the actual priority of the second UE to send data and the priority of the second UE to be scheduled for data transmission, and Adjusting the predetermined threshold according to the detected PSCCH includes: adjusting the predetermined threshold according to the priority offset indication. 14. The method of claim 13, wherein compensating the PSSCH-RSRP according to the detected PSCCH comprises: compensating the PSSCH-RSRP according to at least one of the following: The second UE uses multiple antennas to send instructions; or Instructions to perform PSSCH-RSRP compensation on the second UE. 15. A first user equipment UE, including: transceiver; processor; and The memory stores computer-executable instructions that, when executed by the processor, cause the first UE to perform the method according to any one of claims 1 to 14. 16. A computer storage medium storing computer-executable instructions. When executed by a processor of a first user equipment UE, the computer-executable instructions cause the first UE to execute the method according to any one of claims 1 to 14. method described in the item.