CN107041001B - Method and device for determining communication resources - Google Patents

Abstract

The invention provides a method and device for determining communication resources. Wherein, the method includes: acquiring scheduling allocation SA indication information for device-to-device D2D communication; determining communication resources for transmitting the data packet to be transmitted according to a mapping rule between the SA indication information and the data packet to be transmitted. The present invention solves the problem of relatively large data transmission time delay caused by sending data through data resource pool cycles in D2D communication in the related art, thereby achieving the effect of shortening the data transmission time delay.

Description

Method and device for determining communication resources

technical field

The present invention relates to the communication field, in particular, to a method and device for determining communication resources.

Background technique

Device to Device (D2D for short) communication technology is a wireless communication method for data sharing and exchange with limited distance, range and capacity between devices. The type of business it undertakes generally does not require the source of business data to pass through the core network, and only needs to be completed between user terminals. More specifically, Vehicle to X communication (Vehicle to X, referred to as V2X) refers to the communication between a vehicle-mounted device and other devices (another vehicle-mounted device, roadside device, pedestrian handheld device, and the Internet) in accordance with the agreed communication protocol and data interaction standard. etc.) for wireless communication and information exchange. Vehicle networking communication can enable vehicles to obtain driving safety, improve traffic efficiency, and obtain convenience or entertainment information. Vehicle-to-vehicle communication includes three different types: communication between vehicles (Vehicle to Vehicle, V2V for short), communication between vehicles and roadside equipment (Vehicle to Infrastructure, V2I for short), and communication between vehicles and pedestrians (V2V for short). Vehicle to Pedestrian, referred to as V2P).

The Internet of Vehicles communication can realize the interconnection and intercommunication between vehicles and vehicles V2V, vehicles and people V2P, and vehicles and infrastructure V2I, and extract and share information effectively on the information network platform. Based on wireless channel communication, the Internet of Vehicles realizes real-time information interaction between vehicles and between vehicles and roadside infrastructure, and notifies them of their position, speed, acceleration, driving path and other information. It can also obtain road environment information, cooperate to perceive road danger conditions, and provide various collision warning information in time to prevent road traffic safety accidents and improve the safety of vehicles involved.

At present, the 3GPP organization has started V2X communication research based on Long Term Evolution (LTE for short), among which, the communication method based on Device-to-Device (D2D for short) is one of the ways to implement the V2X standard. one. D2D refers to that between user equipments (User Equipment, UE for short) that have service transmission, service data is directly transmitted from the source user equipment to the target user equipment through the air interface without being forwarded by the base station and the core network. This method is obviously different from the traditional cellular system communication. For the V2V communication of the Internet of Vehicles, the short-distance communication between vehicles can use the D2D communication method to save wireless spectrum resources and reduce the core network. The pressure of data transmission can reduce the occupation of system resources, increase the spectral efficiency of cellular communication systems, reduce the power consumption of terminal transmission, and save network operating costs to a large extent. The communication method based on the LTE cellular communication network link is another way to realize the V2X standard. In this way, the base station or/and the relay will participate in the V2X communication and transmit the V2X signal in the uplink and/or downlink .

However, it should be noted that in D2D communication, data is sent periodically through the data resource pool, which will inevitably lead to a large data sending delay.

In the related art, no effective solution has been proposed for the problem of relatively large data transmission delay caused by data transmission through the period of the data resource pool in the D2D communication.

Contents of the invention

The present invention provides a method and device for determining communication resources, so as to at least solve the problem of relatively large data transmission delay caused by data transmission through data resource pool cycles in D2D communication in the related art.

According to one aspect of the present invention, a method for determining communication resources is provided, including: acquiring scheduling allocation SA indication information for device-to-device D2D communication; according to a mapping rule between the SA indication information and data packets to be transmitted , determining a communication resource for transmitting the data packet to be transmitted.

Optionally, when the communication resource includes a frequency domain location, determining the communication resource used to transmit the data packet to be transmitted includes: configuring the SA indication information and the data packet to be transmitted in the D2D communication On different frequency domain resource positions divided by the bandwidth.

Optionally, when the communication resource includes a transmission subframe, determining the communication resource used to transmit the data packet to be transmitted includes: the first transmission and/or the last transmission of the subframe carrying the SA indication information and The transmission subframe is determined by a fixed subframe offset; or, the transmission subframe is determined by the position of the subframe offset indicated by the SA indication information, wherein the position of the subframe offset is The position of the subframe is predetermined number of times away from the position of the subframe carrying the SA indication information.

Optionally, determining the transmission subframe by using the subframe carrying the SA indication information of the first transmission and/or the last transmission and the fixed subframe offset includes: obtaining The position of the subframe carrying the SA indication information after the fixed subframe offset, where the value of the fixed subframe offset includes: the transmission period of the SA indication information, or any A positive integer; using the position as the starting point of subframe mapping, map the subframe set indicated by the SA indication information; use the subframe in the subframe set as the transmission subframe.

Optionally, the determining the transmission subframe based on the position of the subframe offset indicated by the SA indication information includes: according to the position of the subframe carrying the SA indication information and the SA The subframe mapping starting point is obtained from the position of the subframe offset indicated by the indication information; according to the subframe mapping starting point, the subframe set indicated by the SA indication information is mapped; the subframe in the subframe set is as the transmission subframe; or, divide the SA indication information into multiple SA resource subgroups in the time domain; according to the position of the boundary of the SA resource subgroup and the SA indication information indicated The position of the subframe offset is obtained to obtain the subframe mapping starting point; according to the subframe mapping starting point, map the subframe set indicated by the SA indication information; use the subframe in the subframe set as the transmission subframe frame.

Optionally, the mapping the subframe set indicated by the SA indication information includes: after obtaining the subframe mapping starting point, according to the number of data packets transmitted according to the SA indication information, the data packet The number of retransmissions and the transmission interval of the data packet determine the transmission subframes other than the initial transmission subframe indicated by the starting point of the subframe mapping, so as to obtain the subframe set.

Optionally, the number of data packets transmitted indicated by the SA indication information and the number of retransmission times of the data packets are determined in the following manner: presetting a predetermined number of data packets and the number of retransmission times of each data packet; or receiving the number of data packets and the number of retransmission times of the data packets configured by the network side entity through high-level signaling and/or physical layer signaling; or, according to the load carried on the D2D communication bandwidth, The number of the data packets and the number of retransmission times of the data packets are selected.

Optionally, after mapping the subframe set indicated by the SA indication information, it further includes: respectively mapping the first transmission and retransmission of each data packet to the subframes included in the subframe set according to a predetermined rule ; Wherein, the predetermined rule is to first map the first transmission and retransmission of a data packet, and then map the first transmission and retransmission of the next data packet.

Optionally, the network side entity includes any one of the following: evolved base station eNB, relay station RN, cell coordination entity MCE, gateway GW, mobility management equipment MME, evolved universal terrestrial radio access network EUTRAN, operation management and Maintain the OAM manager.

According to another aspect of the present invention, there is provided an apparatus for determining communication resources, including: an acquiring module, configured to acquire scheduling allocation SA indication information for device-to-device D2D communication; a determining module, configured to use the SA indication The mapping rule between the information and the data packet to be transmitted determines the communication resources used to transmit the data packet to be transmitted.

Optionally, the determining module includes: a processing unit configured to configure the SA indication information and the data packet to be transmitted in the D2D communication bandwidth when the communication resource includes a frequency domain location. on different frequency domain resource locations.

Optionally, the determining module includes: a first determining unit, configured to, when the communication resource includes a transmission subframe, use the subframe carrying the SA indication information and the fixed subframe of the first transmission and/or the last transmission The frame offset determines the transmission subframe; or, the second determination unit is configured to determine the transmission subframe according to the position of the subframe offset indicated by the SA indication information, wherein the subframe offset is The shifted position is the position of a predetermined number of subframes away from the position of the subframe carrying the SA indication information.

Optionally, the first determining unit includes: a first acquiring subunit, configured to acquire the fixed subframe offset from the first transmission and/or the last transmission of the subframe carrying the SA indication information Wherein, the value of the fixed subframe offset includes: the transmission period of the SA indication information, or any positive integer; the first mapping subunit is used to use the position as a subframe mapping The starting point is to map the subframe set indicated by the SA indication information; the first setting subunit is configured to use a subframe in the subframe set as the transmission subframe.

Optionally, the second determining unit includes: a second obtaining subunit, configured to locate a subframe according to the position of the subframe carrying the SA indication information and the subframe offset indicated by the SA indication information. The position of the subframe mapping starting point is obtained; the second mapping subunit is used to map the subframe set indicated by the SA indication information according to the subframe mapping starting point; the second setting subunit is used to set the subframe The subframe in the set is used as the transmission subframe; or, the division subunit is used to divide the SA indication information into multiple SA resource subgroups in the time domain; the third acquisition subunit is used to divide the SA indication information into multiple SA resource subgroups according to the The position of the boundary of the SA resource subgroup and the position of the subframe offset indicated by the SA indication information obtain the subframe mapping starting point; the third mapping subunit is used to map according to the subframe mapping starting point The subframe set indicated by the SA indication information; the third setting subunit is configured to use a subframe in the subframe set as the transmission subframe.

Optionally, the first mapping subunit or the second mapping subunit or the third mapping subunit is further configured to transmit the data indicated by the SA indication information after obtaining the subframe mapping starting point The number of packets, the number of retransmission times of the data packet, and the transmission interval of the data packet determine the transmission subframes other than the initial transmission subframe indicated by the starting point of the subframe mapping, so as to obtain the subframe frame collection.

Optionally, the first mapping subunit or the second mapping subunit or the third mapping subunit is further configured to determine the number of data packets transmitted indicated by the SA indication information, the data The number of retransmissions of packets: pre-setting a predetermined number of data packets and the number of retransmissions of each data packet; or, receiving the number of data packets configured by the network side entity through high-level signaling and/or physical layer signaling and the number of retransmission times of the data packets; or, according to the load carried on the D2D communication bandwidth, select the number of the data packets and the number of retransmission times of the data packets.

Optionally, the first determining unit or the second determining unit is further configured to, after mapping the subframe set indicated by the SA indication information, map the first transmission and retransmission of each data packet according to a predetermined rule to the subframes included in the subframe set; wherein, the predetermined rule is to first map the initial transmission and retransmission of a data packet, and then map the initial transmission and retransmission of the next data packet.

Optionally, the network side entity includes any one of the following: evolved base station eNB, relay station RN, cell coordination entity MCE, gateway GW, mobility management equipment MME, evolved universal terrestrial radio access network EUTRAN, operation management and Maintain the OAM manager.

According to the present invention, the SA instruction information for device-to-device D2D communication is obtained; and the communication resource for transmitting the data packet to be transmitted is determined according to the mapping rule between the SA instruction information and the data packet to be transmitted. That is to say, the present invention removes the period of the data resource pool, but determines the communication resource used to transmit the data packet to be transmitted according to the mapping rule between the SA indication information and the data packet to be transmitted, thereby avoiding the The problem of large data transmission delay caused by sending data through the cycle of the data resource pool in the medium, and then achieves the effect of shortening the data transmission delay.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a flow chart of determining communication resources according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of D2D SA resources and data resources according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of an LTE system frame structure according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of an SA mapping a PSSCH subframe by indicating a TRP bitmap in a D2D communication system according to an embodiment of the present invention;

5 is a schematic diagram (1) of mapping subframes through a TRP bitmap sequence and mapping subframes through a fixed retransmission interval according to an embodiment of the present invention;

6 is a schematic diagram (2) of mapping subframes through a TRP bitmap sequence and mapping subframes through a fixed retransmission interval according to an embodiment of the present invention;

Fig. 7 is a structural block diagram of an apparatus for determining communication resources according to an embodiment of the present invention;

FIG. 8 is a structural block diagram (1) of an apparatus for determining communication resources according to an embodiment of the present invention;

FIG. 9 is a structural block diagram (2) of an apparatus for determining communication resources according to an embodiment of the present invention;

FIG. 10 is a structural block diagram (3) of an apparatus for determining communication resources according to an embodiment of the present invention;

Fig. 11 is a structural block diagram (4) of an apparatus for determining communication resources according to an embodiment of the present invention.

Detailed ways

Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence.

Example 1

In this embodiment, a method for determining communication resources is provided. FIG. 1 is a flowchart for determining communication resources according to an embodiment of the present invention. As shown in FIG. 1 , the process includes the following steps:

Step S102, acquiring the scheduling allocation SA indication information for device-to-device D2D communication;

Step S104, according to the mapping rule between the SA indication information and the data packet to be transmitted, determine the communication resources used to transmit the data packet to be transmitted.

Optionally, in this embodiment, the application scenarios of the above method for determining communication resources include but are not limited to: Vehicle to X communication (Vehicle to X, referred to as V2X for short), device-to-device (Device-to-Device, referred to as D2D) communication. In the above application scenario, acquire the scheduling allocation SA indication information used for device-to-device D2D communication; determine the communication resource used to transmit the data packet to be transmitted according to the mapping rule between the SA indication information and the data packet to be transmitted . That is to say, this embodiment removes the cycle of the data resource pool, but determines the communication resource used to transmit the data packet to be transmitted according to the mapping rule between the SA indication information and the data packet to be transmitted, thereby avoiding the In the communication, the problem of large data transmission delay caused by sending data through the period of the data resource pool, thereby achieving the effect of shortening the data transmission delay.

Optionally, in this embodiment, the aforementioned communication resources include but are not limited to any of the following: transmission subframes for transmitting data packets to be transmitted, frequency domain positions for transmitting data packets to be transmitted, transmission subframes for retransmission The frame and the manner of transmitting the data packet to be transmitted on the indicated subframe are not limited here.

In an optional implementation manner, when the communication resource includes a frequency domain location, determining the communication resource used to transmit the data packet to be transmitted includes the following steps:

Step S11, configuring the SA indication information and the data packets to be transmitted on different frequency domain resource positions divided by the D2D communication bandwidth.

Optionally, in this embodiment, the configuration of the SA indication information and the data packets to be transmitted in the frequency domain resource positions divided by the D2D communication bandwidth includes but is not limited to: the SA indication information and the data packets to be transmitted occupy the same resource block , or the SA indication information and the data packet to be transmitted occupy different resource blocks.

The relationship between the SA indication information and the resource block positions occupied by the data to be transmitted will be described below with reference to FIG. 2 .

As shown in FIG. 2 , in the time domain, the SA indication information and the data to be transmitted are located in different subframe positions; in the frequency domain, the SA indication information and the data to be transmitted occupy different resource blocks.

In an optional implementation manner, when the communication resource includes a transmission subframe, determining the communication resource used to transmit the data packet to be transmitted includes the following steps:

Step S21, determine the transmission subframe by the subframe carrying the SA indication information of the first transmission and/or the last transmission and the fixed subframe offset; or,

Step S22, determine the transmission subframe according to the position of the subframe offset indicated by the SA indication information, wherein the position of the subframe offset is the distance from the subframe carrying the SA indication information The position is the position where a predetermined number of subframes are located.

In this optional implementation manner, the transmission subframe is determined by the subframe carrying the SA indication information of the first transmission and/or the last transmission and the fixed subframe offset, or by the subframe offset indicated by the SA indication information The location determines the transmission subframe, and quickly determines the transmission subframe of the data packet to be transmitted, thereby increasing the transmission rate of the data packet.

In an optional implementation manner, determining the transmission subframe by using the subframe carrying the SA indication information of the first transmission and/or the last transmission and a fixed subframe offset includes the following steps:

Step S31, obtaining the position after the fixed subframe offset from the first and/or last transmitted subframe carrying the SA indication information, wherein the value of the fixed subframe offset includes: the SA Indicates the transmission period of the information, or any positive integer;

Step S32, taking the position as the starting point of subframe mapping, and mapping the subframe set indicated by the SA indication information;

In step S33, a subframe in the subframe set is used as the transmission subframe.

It should be noted that, in this optional implementation manner, the values of the fixed subframe offset include but are not limited to: 0, 1 and the transmission period of the SA indication information, which are not limited here.

In this optional implementation manner, first determine the subframe mapping start point, and map the subframe set indicated by the SA indication information according to the subframe mapping start point, and use the subframe in the subframe set as the above-mentioned transmission subframe, so that The effect of flexibly indicating the subframe of the data channel is realized.

In an optional implementation manner, determining the transmission subframe according to the position of the subframe offset indicated by the SA indication information includes the following steps:

Step S41, obtain the subframe mapping starting point according to the position of the subframe carrying the SA indication information and the position of the subframe offset indicated by the SA indication information; according to the subframe mapping starting point, map the SA indication The subframe set indicated by the information; the subframe in the subframe set is used as the transmission subframe; or,

Step S42, dividing the SA indication information into a plurality of SA resource subgroups in the time domain; according to the position of the boundary of the SA resource subgroup and the position of the subframe offset indicated by the SA indication information, the A subframe mapping starting point; according to the subframe mapping starting point, map the subframe set indicated by the SA indication information; use the subframe in the subframe set as the transmission subframe.

In this optional implementation, the transmission subframe is determined by the subframe offset indicated by the SA indication information, which further solves the data transmission delay caused by data transmission in the period of the data resource pool in the related art. Larger problems have achieved the effect of shortening the data transmission delay.

In an optional implementation manner, mapping the subframe set indicated by the SA indication information includes the following steps:

Step S51, after obtaining the starting point of the subframe mapping, according to the number of data packets transmitted indicated by the SA instruction information, the number of retransmission times of the data packets, and the transmission interval of the data packets, determine Transmission subframes other than the indicated starting transmission subframe to obtain the subframe set.

In this optional implementation manner, the above subframe set is obtained by first mapping the initial transmission subframe, and then sequentially mapping the transmission subframes after the initial subframe, thereby improving the accuracy of determining the transmission subframe.

In an optional implementation manner, the number of data packets transmitted and the number of retransmission times of the data packets indicated by the SA indication information are determined in the following manner:

Step S61, preset a predetermined number of data packets and the number of retransmissions of each data packet; or,

Step S62, receiving the number of data packets and the number of retransmission times of the data packets configured by the network side entity through high-level signaling and/or physical layer signaling; or,

Step S63: Select the number of data packets and the number of retransmission times of the data packets according to the load carried by the D2D communication bandwidth.

It should be noted that, the above-mentioned predetermined numerical value includes but not limited to: 1, 2, 3, and there is no limitation here.

Through this optional implementation manner, the number of data packets transmitted and the number of retransmission times of the data packets indicated by the SA indication information are determined, which further improves the efficiency of determining the transmission subframe.

In an optional implementation manner, after mapping the subframe set indicated by the SA indication information, the following steps are further included:

Step S71, respectively map the first transmission and retransmission of each data packet to the subframes included in the subframe set according to a predetermined rule; wherein, the predetermined rule is to first map the first transmission and retransmission of a data packet and then Map the first transmission and retransmission of the next packet.

In this optional implementation, the data packets to be transmitted according to the above predetermined rules are sequentially mapped to the subframe set, so that each data packet can be transmitted in the corresponding transmission subframe, further improving the utilization of channel resources rate and data transfer rate.

In an optional implementation manner, the network side entity includes any of the following: evolved base station eNB, relay station RN, cell coordination entity MCE, gateway GW, mobility management equipment MME, evolved universal terrestrial radio access network EUTRAN, Operations management and maintenance OAM manager.

The embodiments are illustrated below in conjunction with specific examples.

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如图4所示，eNB可以灵活地根据UE需求动态调度配置所需的资源。In a traditional cellular communication system, UE wireless resources are controlled and scheduled by an evolved base station eNB (evolved NodeB). The eNB indicates the downlink or uplink resources configured by the UE. The transmitted data signal, or the signal transmitted to the eNB on the uplink resource. In the LTE system, radio resources are divided in units of radio frames in the time domain, and each radio frame is 10 ms and includes 10 subframes. Each subframe is 1ms long and divided into 2 time slots of 0.5ms. As shown in Figure 3, in the frequency domain, resources are divided in units of subcarriers, and each subcarrier contains 15kHz or 7.5kHz resources. According to the above resource units in time domain and frequency domain, the minimum unit for eNB to schedule time-frequency resources for UE is resource block (Resource Block, referred to as RB). RB is defined as one slot in the time domain and continuous in the frequency domain. of

subcarriers, />

As shown in Fig. 4, the eNB can flexibly schedule and configure required resources dynamically according to UE requirements.

As an implementation of device-to-device communication, LTE extends the corresponding wireless parameters. LTE uses a physical sidelink shared channel (Physical Sidelink Shared Channel, PSSCH for short) for D2D communication. The D2D transmitting UE that has D2D data to be sent can obtain the PSSCH subframe configuration from the eNB, or select a certain subframe in the system predefined resource pool as the PSSCH subframe, and the eNB configures and indicates the PSSCH subframe to the transmitting UE, or The UE at the transmitting end indicates the used PSSCH subframes to the UE at the receiving end, and indicates the used one or more PSSCH subframes by using a time domain resource pattern (Time Resource Pattern, TRP for short). In the device-to-device communication based on LTE extension, the frequency band of the network can be shared, or a dedicated frequency band can be used for communication.

In LTE D2D communication, the SCI control information provides the location information of resources. Wherein, the TRP is used to determine the transmission subframe of data. The TRP information can be indicated by DCI 5, that is, the D2D resource scheduling instruction dedicated control information format sent by the network, and the TRP is indicated in the side link (ie D2D link) control information (Sidelink Control Information, referred to as SCI). TRP information can also be sent by SA. The indicated TRP is 7-bit information, representing a TRP index. Each TRP index corresponds to a unique bitmap sequence. At present, the length of the bitmap sequence of LTE is N, where N=6, 7, 8, wherein the number of valid indicator bits is k, that is, the number of bits marked as "1" in the bitmap sequence. In FIG. 4, a bitmap is used to indicate the form of a subframe. For example, "11110000" is a bitmap sequence with N=8 and k=4. According to the bitmap sequence indicated by the TRP index, the corresponding subframe whose bit flag is "1" is indicated as a PSSCH subframe. In this embodiment, it focuses on how to indicate each subframe in a period when D2D resources are not configured. When there is a PSSCH resource pool configuration, the bitmap sequence indicated by the TRP is indicated in a one-to-one correspondence on logically continuous subframes included in the resource pool. In the embodiment, when indicating the data channel subframe by determining the number of times of TRP mapping and mapping the starting subframe, the mapping of the TRP bitmap sequence to the subframe is also applicable to the direct mapping indication of the actual physical subframe, and based on the logical subframe Mapping indication for a collection of frames.

In the device-to-device communication that can be applied to vehicles, the subframe mapping method without the TRP bitmap can also be used, and the transmission subframe can be determined in other ways. Reception can be terminated by the next dispatch command, or by a configurable number of repetitions.

The data channel subframes are determined respectively for TRP and non-TRP indications, and the specific methods include:

In an optional implementation manner of this embodiment, the bitmap corresponding to the TRP is used to map the data packet and the retransmission subframe.

When using the bitmap sequence corresponding to the TRP index to map the data packet of the data channel on the subframe, it is necessary to determine the starting position and the number of mapping times of the mapped bitmap sequence.

Select a fixed subframe offset position relative to the first or last SA subframe to start mapping the subframe indicated by the bitmap indicated in the SA. The fixed subframe offset can take a value of 1, an SA transmission period, or other integer values. The first or last SA subframe is used to determine the transmission subframe of the data channel. Or determine the transmission subframe that the bitmap starts to map through the offset of the SA scheduling indication

Determine the number of required data packets and the number of data packet transmissions in the following manner. The number of transmitted data packets is Pt, and the number of times each data packet is transmitted is Rt times. Generally, a data packet is transmitted using one subframe at a time:

Set a fixed number of data packets, and or the number of retransmissions of data packets; or,

Configure the number of data packets scheduled by one SA of the device by high-level signaling and/or physical layer signaling, and or the number of retransmissions of the data packets; or,

According to the load of the channel, the device autonomously and dynamically selects the number of data packets scheduled to be transmitted by an SA, and/or the number of retransmission times of the data packets;

The bitmap indicated in the SA is mapped times from the start frame to M=Ceiling(Pt*Rt/k). The mapped Bitmaps M times may be connected or may be at a certain subframe interval. .

The device sequentially maps to the set of subframes selected by the aforementioned bitmap based on the determined number of transmission data packets and the number of retransmission times of the data packets. The device sequentially maps the first transmission and retransmission of each data packet on the set of subframes it belongs to. The order of mapping is performed according to the specified first transmission and retransmission times of one data packet, and then the first transmission and retransmission of another data packet are mapped. When all data packets are mapped, the remaining subframes of the subframe set are no longer mapped.

In another optional implementation manner of this embodiment, the transmission subframe is determined by the number of data packet transmissions, the number of retransmission times, and the transmission interval.

When the bitmap sequence corresponding to the TRP index is not used to map the data packet of the data channel on the subframe, it is necessary to determine the start position, interval and frequency of the mapped subframe.

Select a fixed subframe offset position relative to the first or last SA subframe to start mapping the subframe indicated by the bitmap indicated in the SA. The fixed subframe offset can take a value of 1, an SA transmission period, or other integer values. The first or last SA subframe is used to determine the transmission subframe of the data channel. Alternatively, the transmission subframe to which the bitmap starts to map is determined through the offset of the scheduling indication of the SA, hereinafter referred to as the start frame.

Determine the number of required data packets and the number of data packet transmissions in the following manner. The number of transmitted data packets is Pt, and the number of times each data packet is transmitted is Rt times. Generally, a data packet is transmitted using one subframe at a time:

Set a fixed number of data packets, and or the number of retransmissions of data packets; or,

Configure the number of data packets scheduled by one SA of the device by high-level signaling and/or physical layer signaling, and or the number of retransmissions of the data packets; or,

According to the load of the channel, the device autonomously and dynamically selects the number of data packets scheduled to be transmitted by an SA, and/or the number of retransmission times of the data packets;

The M times of Bitmaps mapped from the initial frame by the bitmap indicated in the SA may be contiguous, or may be at a certain subframe interval. .

The device sequentially maps to the set of subframes selected by the aforementioned bitmap based on the determined number of transmission data packets and the number of retransmission times of the data packets. The device sequentially maps the first transmission and retransmission of each data packet on the set of subframes it belongs to. The order of mapping is based on the specified first transmission and retransmission times of a data packet, and then the first transmission and retransmission of another data packet are mapped. The number of times of mapping from the start frame is Pt*Rt times. The interval between the first transmission and retransmission of each data packet is X. The interval between packets is Y. Both X and Y are positive integers set by the system.

The above various methods of indicating the data channel subframe set by mapping the starting position can be used in any combination under the condition of no conflict, and are further described through optional embodiments below.

Optional embodiment one

In the device-to-device communication system, the number of data packets transmitted is Pt, and the number of times each data packet is transmitted is Rt times. The device sets a fixed number of data packets as Pt=3. Wherein, the number of retransmissions of the data packet is Rt=2, that is, one initial transmission plus one retransmission. The mapping interval of Bitmap is 0.

The mapping start subframe of the predefined TRP is the SA scheduling offset of 4 subframes, and the corresponding TRP bitmap sequence mapping indicates the effect of the data channel subframe as shown in FIG. 5 . According to the indicated TRP index, it can be determined that the corresponding bitmap sequence is "10101000". Bitmap sequence k value is 3. Therefore, the Bitmap needs to be mapped twice. The Bitmap sequence is mapped from the first subframe and mapped twice in total, correspondingly indicating that 6 subframes are data channel subframes. It can be seen that by setting predefined rules, effective mapping of TRP indications can be realized without any signaling indication.

Optional embodiment two

In the device-to-device communication system, the number of data packets transmitted is Pt, and the number of times each data packet is transmitted is Rt times. The device sets a fixed number of data packets as Pt=1. Wherein, the number of retransmissions of the data packet is Rt=3, that is, one initial transmission plus two retransmissions. The retransmission interval between packets is 1.

The mapping start subframe of the predefined TRP is the SA scheduling offset of 15 subframes, and the effect of mapping the indicated data channel subframe is shown in the lower part of Figure 5 . The device starts mapping from the first subframe, and maps 3 times in total, indicating that 3 subframes are data channel subframes. The use of data subframes can be realized through simple retransmission rules.

Optional embodiment three

In order to reuse the SA retransmission mechanism of D2D to solve the half-duplex problem in the case of frequency division multiplexing (FDM) resource pool configuration, and define the corresponding relationship between SA and Data more simply, further The frequency domain resources of the SA are divided.

As shown in Figure 6, the frequency division of SA and Data divides the SA resource pool into subgroups. In each subgroup, SA uses a pattern similar to D2D to solve the half-duplex problem and also limits the maximum retransmission interval of SA. Reduced latency.

The Data indicated by the SA is transmitted on certain subframes of the Data resource pool. The subframe for transmitting Data can be indicated by a method similar to T-RPT, or by a method of fixed offset + interval. (for example optional embodiment one and two)

Optional Embodiment Four

In the device-to-device communication system, the maximum number of data packets transmitted in one SA scheduling is Pt, and the maximum number of transmissions of each data packet is Rt times. Assume that Pt=2 in this implementation example, and the number of retransmissions Rt=4 of the data packet. That is, 1 first pass plus 2 retransmissions. The retransmission interval between packets is 0.

The predefined mapping start subframe is the first transmission of SA and the scheduling offset is 10 subframes, then the mapping indicates that the subframe of the data channel is mapped from the 10th subframe after the first transmission of SA inferred according to the detection. The device judges whether all data packets and all retransmissions have been transmitted based on the detected network congestion. Reduce the number of retransmissions and packets according to specific rules when congestion is detected.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products are stored in a storage medium (such as ROM/RAM, disk, CD) contains several instructions to enable a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in various embodiments of the present invention.

Example 2

This embodiment also provides a device for determining communication resources, which is used to implement the above embodiments and preferred implementation modes, and what has already been described will not be repeated. As used below, the term "module" may be a combination of software and/or hardware that realizes a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementations in hardware, or a combination of software and hardware are also possible and contemplated.

FIG. 7 is a structural block diagram of an apparatus for determining communication resources according to an embodiment of the present invention. As shown in FIG. 7, the apparatus includes:

1) An acquisition module 72, configured to acquire scheduling assignment SA indication information for device-to-device D2D communication;

2) A determination module 74, configured to determine the communication resource used to transmit the data packet to be transmitted according to the mapping rule between the SA indication information and the data packet to be transmitted.

Optionally, in this embodiment, the application scenarios of the above method for determining communication resources include but are not limited to: Vehicle to X communication (Vehicle to X, referred to as V2X for short), device-to-device (Device-to-Device, referred to as D2D) communication. In the above application scenario, acquire the scheduling allocation SA indication information used for device-to-device D2D communication; determine the communication resource used to transmit the data packet to be transmitted according to the mapping rule between the SA indication information and the data packet to be transmitted . That is to say, this embodiment removes the cycle of the data resource pool, but determines the communication resource used to transmit the data packet to be transmitted according to the mapping rule between the SA indication information and the data packet to be transmitted, thereby avoiding the In the communication, the problem of large data transmission delay caused by sending data through the period of the data resource pool, thereby achieving the effect of shortening the data transmission delay.

Optionally, in this embodiment, the aforementioned communication resources include but are not limited to any of the following: transmission subframes for transmitting data packets to be transmitted, frequency domain positions for transmitting data packets to be transmitted, transmission subframes for retransmission The frame and the manner of transmitting the data packet to be transmitted on the indicated subframe are not limited here.

In an optional implementation manner, FIG. 8 is a structural block diagram (1) of an apparatus for determining communication resources according to an embodiment of the present invention. As shown in FIG. 8 , the determining module 74 includes:

1) The processing unit 82 is configured to configure the SA indication information and the data packet to be transmitted on different frequency domain resource positions divided by the D2D communication bandwidth when the communication resource includes a frequency domain position.

Optionally, in this embodiment, the configuration of the SA indication information and the data packets to be transmitted in the frequency domain resource positions divided by the D2D communication bandwidth includes but is not limited to: the SA indication information and the data packets to be transmitted occupy the same resource block , or the SA indication information and the data packet to be transmitted occupy different resource blocks.

The relationship between the SA indication information and the resource block positions occupied by the data to be transmitted will be described below with reference to FIG. 2 .

As shown in FIG. 2 , in the time domain, the SA indication information and the data to be transmitted are located in different subframe positions; in the frequency domain, the SA indication information and the data to be transmitted occupy different resource blocks.

In an optional implementation manner, FIG. 9 is a structural block diagram (2) of an apparatus for determining communication resources according to an embodiment of the present invention. As shown in FIG. 9 , the determining module 74 includes:

1) The first determining unit 92 is configured to determine the transmission subframe by using the subframe carrying the SA indication information of the first transmission and/or the last transmission and a fixed subframe offset when the communication resource includes a transmission subframe; or,

2) The second determining unit 94 is configured to determine the transmission subframe according to the position of the subframe offset indicated by the SA indication information, wherein the position of the subframe offset is a distance from the subframe carrying the SA The location of the subframe of the indication information is the location of a predetermined number of subframes.

In this optional implementation manner, the transmission subframe is determined by the subframe carrying the SA indication information of the first transmission and/or the last transmission and the fixed subframe offset, or by the subframe offset indicated by the SA indication information The location determines the transmission subframe, and quickly determines the transmission subframe of the data packet to be transmitted, thereby increasing the transmission rate of the data packet.

In an optional implementation manner, FIG. 10 is a structural block diagram (3) of an apparatus for determining communication resources according to an embodiment of the present invention. As shown in FIG. 10 , the first determining unit 92 includes:

1) The first acquiring subunit 102 is configured to acquire the position after the first transmission and/or the last transmission of the subframe carrying the SA indication information is offset from the fixed subframe, wherein the fixed subframe The value of the offset includes: the transmission period of the SA indication information, or any positive integer;

2) The first mapping subunit 104 is configured to map the subframe set indicated by the SA indication information with the position as the starting point of subframe mapping;

3) The first setting subunit 106 is configured to use a subframe in the subframe set as the transmission subframe.

It should be noted that, in this optional implementation manner, the values of the fixed subframe offset include but are not limited to: 0, 1 and the transmission period of the SA indication information, which are not limited here.

In this optional implementation manner, first determine the subframe mapping start point, and map the subframe set indicated by the SA indication information according to the subframe mapping start point, and use the subframe in the subframe set as the above-mentioned transmission subframe, so that The effect of flexibly indicating the subframe of the data channel is realized.

In an optional implementation manner, FIG. 11 is a structural block diagram (4) of an apparatus for determining communication resources according to an embodiment of the present invention. As shown in FIG. 11 , the second determining unit 94 includes:

1) The second obtaining subunit 112 is used to obtain the subframe mapping starting point according to the position of the subframe carrying the SA indication information and the position of the subframe offset indicated by the SA indication information; 2) the second The second mapping subunit 114 is configured to map the subframe set indicated by the SA indication information according to the subframe mapping starting point; 3) the second setting subunit 116 is configured to use the subframe in the subframe set as the transmission subframe; or,

4) The division subunit 118 is used to divide the SA indication information into multiple SA resource subgroups in the time domain; 5) The third acquisition subunit 120 is used to divide the SA resource subgroup according to the position of the boundary of the SA resource subgroup and the position of the subframe offset indicated by the SA indication information to obtain the subframe mapping starting point; 6) The third mapping subunit 122 is used to map the subframe indicated by the SA indication information according to the subframe mapping starting point set; 7) The third setting subunit 124 is configured to use the subframe in the subframe set as the transmission subframe.

In this optional implementation, the transmission subframe is determined by the subframe offset indicated by the SA indication information, which further solves the data transmission delay caused by data transmission in the period of the data resource pool in the related art. Larger problems have achieved the effect of shortening the data transmission delay.

In an optional implementation manner, the first mapping subunit 104 or the second mapping subunit 114 or the third mapping subunit 122 is further configured to, after obtaining the subframe mapping starting point, transmit The number of data packets, the number of retransmission times of the data packet, and the transmission interval of the data packet determine the transmission subframes other than the initial transmission subframe indicated by the starting point of the subframe mapping, so as to obtain the subframe set .

In this optional implementation manner, the above subframe set is obtained by first mapping the initial transmission subframe, and then sequentially mapping the transmission subframes after the initial subframe, thereby improving the accuracy of determining the transmission subframe.

In an optional implementation manner, the first mapping subunit 104 or the second mapping subunit 114 or the third mapping subunit 122 is further configured to determine the number of data packets transmitted indicated by the SA indication information in the following manner, Number of retransmissions for this packet:

Presetting a predetermined number of data packets and the number of retransmissions of each data packet; or,

Receive the number of data packets and the number of retransmission times of the data packets configured by the network side entity through high-level signaling and/or physical layer signaling; or,

According to the load carried by the D2D communication bandwidth, the number of the data packets and the number of retransmission times of the data packets are selected.

It should be noted that, the above-mentioned predetermined numerical value includes but not limited to: 1, 2, 3, and there is no limitation here.

Through this optional implementation manner, the number of data packets transmitted and the number of retransmission times of the data packets indicated by the SA indication information are determined, which further improves the efficiency of determining the transmission subframe.

In an optional implementation manner, the first determining unit 92 or the second determining unit 94 is further configured to, after mapping the subframe set indicated by the SA indication information, combine the initial transmission and The retransmissions are respectively mapped to the subframes included in the subframe set; wherein, the predetermined rule is to first map the first transmission and retransmission of a data packet, and then map the first transmission and retransmission of the next data packet.

In this optional implementation, the data packets to be transmitted according to the above predetermined rules are sequentially mapped to the subframe set, so that each data packet can be transmitted on the corresponding transmission subframe, further improving the utilization of channel resources rate and data transfer rate.

In an optional implementation manner, the network side entity includes any one of the following: evolved base station eNB, relay station RN, cell coordination entity MCE, gateway GW, mobility management equipment MME, evolved universal terrestrial radio access network EUTRAN , Operation Management and Maintenance OAM Manager.

It should be noted that each of the above-mentioned modules can be implemented by software or hardware. For the latter, it can be implemented in the following manner, but not limited to this: the above-mentioned modules are all located in the same processor; or, the above-mentioned modules are respectively located in multiple in the processor.

Example 3

The embodiment of the invention also provides a storage medium. Optionally, in this embodiment, the above-mentioned storage medium may be configured to store program codes for performing the following steps:

S1. Acquire scheduling and allocation SA indication information for device-to-device D2D communication;

S2. Determine a communication resource for transmitting the data packet to be transmitted according to a mapping rule between the SA indication information and the data packet to be transmitted.

Optionally, in this embodiment, the above-mentioned storage medium may include but not limited to: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk Various media that can store program codes such as discs or optical discs.

Optionally, in this embodiment, the processor executes the above steps S1 and S2 according to the program code stored in the storage medium.

Optionally, for specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments and optional implementation manners, and details are not repeated in this embodiment.

Obviously, those skilled in the art should understand that each module or each step of the present invention described above can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Alternatively, they may be implemented in program code executable by a computing device so that they may be stored in a storage device to be executed by a computing device, and in some cases in an order different from that shown here The steps shown or described are carried out, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps among them are fabricated into a single integrated circuit module for implementation. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (16)

1. A method for determining a communication resource, comprising:

acquiring scheduling assignment SA indication information for device-to-device (D2D) communication;

determining communication resources for transmitting the data packet to be transmitted according to the mapping rule between the SA indication information and the data packet to be transmitted;

when the communication resource includes a transmission subframe, determining the communication resource for transmitting the data packet to be transmitted includes:

determining the transmission subframe through a subframe carrying the SA indication information and a fixed subframe offset transmitted for the first time and/or transmitted for the last time; or,

and determining the transmission subframe according to the position of the subframe offset indicated by the SA indication information, wherein the position of the subframe offset is a position of a subframe with a preset numerical value from the position of the subframe carrying the SA indication information.

2. The method of claim 1, wherein determining the communication resources for transmitting the data packet to be transmitted when the communication resources comprise frequency domain locations comprises:

and configuring the SA indication information and the data packet to be transmitted on different frequency domain resource positions divided by the communication bandwidth of the D2D.

3. The method according to claim 1, wherein the determining the transmission subframe by the first transmission and/or the last transmission of the subframe carrying the SA indication information and a fixed subframe offset comprises:

acquiring the position of the subframe carrying the SA indication information, which is transmitted for the first time and/or transmitted for the last time, from the fixed subframe offset, wherein the fixed subframe offset comprises the following values: the SA indicates the transmission period of information, or any positive integer;

mapping the subframe set indicated by the SA indication information by taking the position as a subframe mapping starting point;

and taking the subframes in the subframe set as the transmission subframes.

4. The method of claim 1, wherein the determining the transmission subframe by the location of the subframe offset indicated by the SA indication information comprises:

obtaining a subframe mapping starting point according to the position of the subframe carrying the SA indication information and the position of the subframe offset indicated by the SA indication information; mapping the subframe set indicated by the SA indication information according to the subframe mapping starting point; taking subframes in the subframe set as the transmission subframes; or,

Dividing the SA indication information into a plurality of SA resource subgroups in a time domain; obtaining a subframe mapping starting point according to the position of the boundary of the SA resource subgroup and the position of the subframe offset indicated by the SA indication information, and mapping a subframe set indicated by the SA indication information according to the subframe mapping starting point; and taking the subframes in the subframe set as the transmission subframes.

5. The method according to claim 3 or 4, wherein said mapping the set of subframes indicated by the SA indication information comprises:

after the subframe mapping starting point is obtained, determining transmission subframes except for the starting transmission subframe indicated by the subframe mapping starting point according to the number of data packets indicated by the SA indication information, the retransmission times of the data packets and the transmission interval of the data packets so as to obtain the subframe set.

6. The method of claim 5, wherein the number of data packets indicated by the SA indication information and the number of retransmissions of the data packets are determined by:

presetting a preset number of data packets and retransmission times of each data packet; or,

Receiving the number of the data packets configured by a network side entity through higher layer signaling and/or physical layer signaling and the retransmission times of the data packets; or,

and selecting the number of the data packets and the retransmission times of the data packets according to the load borne on the D2D communication bandwidth.

7. The method according to claim 3 or 4, further comprising, after mapping the set of subframes indicated by the SA indication information:

respectively mapping the first transmission and retransmission of each data packet to subframes included in the subframe set according to a preset rule; wherein, the predetermined rule is that first transmission and retransmission of one data packet are mapped and first transmission and retransmission of the next data packet are mapped.

8. The method of claim 6, wherein the network side entity comprises any one of:

the system comprises an evolution base station eNB, a relay station RN, a cell cooperation entity MCE, a gateway GW, mobility management equipment MME, an evolution universal terrestrial radio access network EUTRAN, operation management and maintenance OAM manager.

9. A communication resource determining apparatus, comprising:

an acquisition module, configured to acquire scheduling assignment SA indication information for device-to-device D2D communication;

The determining module is used for determining communication resources for transmitting the data packet to be transmitted according to the mapping rule between the SA indication information and the data packet to be transmitted;

the determining module includes:

a first determining unit, configured to determine, when the communication resource includes a transmission subframe, the transmission subframe by a subframe carrying the SA indication information and a fixed subframe offset transmitted for the first time and/or transmitted for the last time; or,

and a second determining unit, configured to determine the transmission subframe according to a position where a subframe offset indicated by the SA indication information is located, where the position where the subframe offset is located is a position where a subframe with a predetermined value from the position where the subframe carrying the SA indication information is located.

10. The apparatus of claim 9, wherein the determining module comprises:

and the processing unit is used for configuring the SA indication information and the data packet to be transmitted on different frequency domain resource positions divided by the communication bandwidth of the D2D when the communication resource comprises the frequency domain position.

11. The apparatus according to claim 9, wherein the first determining unit comprises:

The first obtaining subunit is configured to obtain a position where the subframe carrying the SA indication information transmitted for the first time and/or the last time is located after the subframe is offset from the fixed subframe, where the value of the fixed subframe offset includes: the SA indicates the transmission period of information, or any positive integer;

a first mapping subunit, configured to map the subframe set indicated by the SA indication information with the location as a subframe mapping start point;

and the first setting subunit is used for taking the subframes in the subframe set as the transmission subframes.

12. The apparatus according to claim 9, wherein the second determining unit includes:

a second obtaining subunit, configured to obtain a subframe mapping starting point according to a position where a subframe carrying the SA indication information is located and a position where a subframe offset indicated by the SA indication information is located; a second mapping subunit, configured to map, according to the subframe mapping start point, the subframe set indicated by the SA indication information; a second setting subunit, configured to use a subframe in the subframe set as the transmission subframe; or,

a dividing subunit, configured to divide the SA indication information into a plurality of SA resource subgroups in a time domain; a third obtaining subunit, configured to obtain a subframe mapping starting point according to a position where a boundary of the SA resource subgroup is located and a position where a subframe offset indicated by the SA indication information is located; a third mapping subunit, configured to map, according to the subframe mapping start point, the subframe set indicated by the SA indication information; and a third setting subunit, configured to take a subframe in the subframe set as the transmission subframe.

13. The apparatus according to claim 11 or 12, wherein the first mapping subunit or the second mapping subunit or the third mapping subunit is further configured to determine, after obtaining the subframe mapping starting point, a transmission subframe other than the starting transmission subframe indicated by the subframe mapping starting point according to the number of data packets indicated to be transmitted by the SA indication information, the number of retransmissions of the data packets, and the transmission interval of the data packets, so as to obtain the subframe set.

14. The apparatus of claim 13, wherein the first mapping subunit or the second mapping subunit or the third mapping subunit is further configured to determine the number of data packets indicated for transmission by the SA indication information and the number of retransmissions of the data packets by:

presetting a preset number of data packets and retransmission times of each data packet; or,

receiving the number of the data packets configured by a network side entity through higher layer signaling and/or physical layer signaling and the retransmission times of the data packets; or,

and selecting the number of the data packets and the retransmission times of the data packets according to the load borne on the D2D communication bandwidth.

15. The apparatus according to claim 11 or 12, wherein the first determining unit or the second determining unit is further configured to map, after mapping the subframe set indicated by the SA indication information, a first transmission and a retransmission of each data packet onto subframes included in the subframe set, respectively, according to a predetermined rule; wherein, the predetermined rule is that first transmission and retransmission of one data packet are mapped and first transmission and retransmission of the next data packet are mapped.

16. The apparatus of claim 14, wherein the network side entity comprises any one of:

the system comprises an evolution base station eNB, a relay station RN, a cell cooperation entity MCE, a gateway GW, mobility management equipment MME, an evolution universal terrestrial radio access network EUTRAN, operation management and maintenance OAM manager.

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