CN103068049B - Method of avoiding interference to device-to-device (D2D) communications caused by cellular communications in honeycomb and D2D hybrid network - Google Patents

Abstract

In a cellular-to-terminal direct-to-D2D hybrid network, a method for avoiding interference of cellular communication to D2D communication is as follows: according to the interference information reported by the D2D UE and the history information of the uplink scheduling stored by the base station itself, the base station identifies a specific D2D After the UE causes harmful interference to the cellular user CeUE, the base station provides the interfered D2D UE with the wireless network temporary identifier RNTI of the interfering CeUE and related information to assist the D2D UE in decoding the information of the interfering CeUE; In this way, the D2D UE can predict the interference situation of the CeUE in the corresponding transmission time interval TTI, and perform corresponding radio resource management operations, so as to avoid the harmful interference caused by the CeUE to the subsequent D2D mode communication. With the assistance of the base station in the present invention, the calculation and decoding of the PDCCH by the D2D UE is simple, flexible and convenient, and is practical in the LTE/LTE-A system.

Description

Method for avoiding interference of cellular communication to D2D communication in cellular and D2D hybrid network

technical field

The invention relates to a method for avoiding interference of cellular communication to D2D communication in a D2D (Device-to-Device) hybrid network connecting cells and terminals, and belongs to the technical field of wireless communication.

Background technique

The current wireless communication network is mainly divided into two types: cellular network and Ad-hoc (point-to-point) network. The communication characteristics of these two networks are introduced as follows:

Cellular network: its coverage area is divided into multiple cells, and each cell has its own base station working at different frequencies. The user terminal UE (User Equipment) communicates with other user terminals through the base station, and this communication mode is called cellular mode. Even when the distance between the receiving and transmitting terminals is very close, communication must be carried out through the base station.

Ad-hoc network: It is a mobile network without wired infrastructure support, and all its nodes are composed of mobile terminals. Each UE directly communicates through direct connection (or by means of a relay), and this communication mode is called a D2D mode.

In the cellular mode, since the base station eNodeB (Evolved Node B) centrally controls the transmission between UEs, it can easily manage and control the wireless resources and interference of the network, but its significant disadvantage is that it cannot effectively use wireless resources. For example, the wireless resources used by two UEs in close distance to communicate in the cellular mode are twice that of the D2D mode. Therefore, in order to obtain higher system throughput, the wireless network in the future is likely to be in a coexistence state of multiple networks including cellular networks and Ad-hoc networks.

Referring to Figure 1, a hybrid network reference model of cellular and D2D is introduced. Among them, the UE can work in the cellular mode and send data to other UEs through the base station, or directly send data to other UEs in the D2D mode. Compared with a single cellular network, this hybrid network can achieve better system performance.

In order to meet the requirement that the maximum bandwidth should be greater than 100MHz, 3GPP proposed carrier aggregation CA (Carrier Aggregation) technology, which is to aggregate multiple component carriers CC (Component Carriers) to provide the required bandwidth (the CCs here may be discontinuous) , which can improve the performance of LTE-A cellular networks. The D2D mode communication can reuse the LTE-A network radio resources using the CA technology, but it also has the interference problem caused by the resource reuse.

The following introduces the existing technical situation of D2D mode communication interference avoidance to cellular communication in the cellular and D2D hybrid network: This technical solution is in the hybrid communication network scenario of D2D mode and cellular mode, D2D users multiplex cellular user uplink A method for avoiding interference caused by a cellular user terminal CeUE (Cellular User Equipment) to a D2D user terminal D2D UE (D2D Equipment,) when using road resources.

Its application scenarios are as follows: UE can work in both D2D mode and traditional cellular mode. The cellular network refers to a WiMAX (Worldwide Interoperability for Microwave Access) cellular network, and user terminals can share resources in D2D mode and cellular mode. In this technical solution, since the uplink UL (Uplink) radio resource management RRM (Radio Resource Management) information of the CeUE, that is, the uplink mapping UL-MAP (Uplink-MAP) based on the WiMAX system can be decoded by the D2D UE, D2D UE can use the uplink radio resource management information to effectively allocate resources, so as to avoid interference from CeUE.

The advantage of this solution is: because the solution is mainly based on the WiMAX cellular network, the WiMAX system signaling is open, so the computational burden of decoding the PDCCH (Physical Downlink Control CHannel) signaling of the CeUE is not very large. Its disadvantages are as follows:

In the LTE-A cellular system, signaling is not open like in WiMAX, so only PDCCH can be solved blindly, which will bring a large amount of calculation. In addition, due to the introduction of CA technology, the PDCCH on a CC may contain control information of other carriers; decoding the PDCCH on a CC cannot obtain all the control information of a CeUE. Therefore, the D2D UE needs to decode the PDCCHs of all carriers and perform a large number of decoding operations, which is very impractical for practical applications. If after the CA technology is introduced, the above solution is still used to perform full-blind decoding of the PDCCH of the CeUE, which requires high hardware requirements, consumes a lot of power, and reduces the benefits of decoding the PDCCH.

In a hybrid network of cellular mode and D2D mode, D2D UEs can autonomously reuse CeUE resources. In the above solution, the D2D UE reuses the uplink communication resources of the CeUE. However, when D2D UEs multiplex CCs, there is a problem of mutual interference between them and the CeUEs using these CCs.

Referring to Figure 2, it introduces an example of D2D UE being interfered by CeUE when multiplexing the CC of CeUE: Among them, D2D TxUE and D2D RxUE are D2D sending user equipment (User Equipment of Transmission) and receiving user equipment (User Equipment of Reception) respectively. . In the figure, when D2DTxUE uses CC No. 1 to communicate in D2D mode, D2D RxUE will detect the interference of CeUE. This is because nearby CeUEs are using CCs No. 1 and No. 3 for uplink transmission.

In the above example, after the CA technology is introduced in the mixed network of LTE-A cellular mode and D2D mode, decoding the PDCCH on a CC cannot obtain all the control information of a CeUE, and the D2D UE needs to decode the PDCCH of all carriers. Such calculation The amount will be very large, which is unrealistic. Therefore, how D2D UE decodes the interfering CeUE information, so as to avoid the interference of CeUE to D2D UE, is an urgent problem to be solved, and it is also a focus of attention of technical personnel in the industry.

Contents of the invention

In view of this, the purpose of the present invention is to provide a method for avoiding the interference of cellular communication to D2D communication in a cellular-to-terminal direct D2D hybrid network. The method can effectively avoid the interference of CeUE uplink communication to D2D mode by introducing CA technology. communication interference, moreover, the operation is simple and the computational complexity is significantly reduced.

In order to achieve the above-mentioned purpose, the present invention provides a method for avoiding interference caused by cellular communication to D2D communication in a D2D (Device-to-Device) hybrid network directly connecting the cell and the terminal, wherein the method is characterized in that: the base station reports the interference information according to the D2D UE After identifying the cellular user CeUE that causes harmful interference to a specific D2D UE, the base station provides the interfered D2D UE with the radio network temporary identifier RNTI of the interfering CeUE ( Radio Network Temporary Identifier) information is used to assist the D2D UE to interfere with the CeUE information; in this way, the D2D UE can predict the interference situation of the CeUE in the corresponding transmission time interval TTI (Transmission Time Interval), And perform corresponding radio resource management operations to avoid interference; the method includes the following steps:

(1) The base station stores the uplink scheduling history information, and broadcasts the storage duration T _record parameter of the uplink scheduling history information to the D2D UE;

(2) D2D UE periodically sends interference reports to the base station: D2D UE measures the received power of each radio resource block RB (Resource Block) allocated to CeUE on the CC, and classifies the interference caused by CeUE according to the threshold T _harmInt to record Time-frequency location information of resources where harmful interference occurs, and periodically report to the base station; the threshold T _harmInt is determined by the D2D UE according to factors including channel status, service quality requirements, and transmission power, and is used to divide the interference caused by CeUE into The following two categories: harmful interference above T _harmInt and harmless interference below T _harmInt ;

(3) The base station identifies the CeUE that causes harmful interference to the D2D UE: the base station judges that it causes harmful interference to the D2D UE by comparing the interference report sent by the D2D UE with the uplink scheduling history information stored by itself including each RB allocated to the CeUE. interfering CeUE;

(4) The base station sends auxiliary information to the D2D UE: In order to complete autonomous radio resource management and avoid interference from the CeUE in D2D mode communication, the D2D UE must obtain auxiliary information from the base station before decoding the PDCCH information to reduce Its decoding difficulty, and then know the CeUE uplink resource allocation information that causes harmful interference to it, so that the interference state can be predicted; the auxiliary information includes at least: the index of the CC in the uplink scheduling information and the wireless network temporary identifier RNTI value, in LTE -When multiple CC schemes are considered in the A system, the improvement effect of the auxiliary information on reducing the difficulty of D2D UE decoding is more significant;

(5) The D2D UE decodes the PDCCH to avoid interference: with the auxiliary information of the base station, the D2D UE decodes the PDCCH containing the CeUE uplink scheduling information that interferes with the D2D RxUE, and obtains the corresponding resource allocation; thus, The D2D UE no longer reuses the resources of the CeUE that causes harmful interference to it, but uses the remaining resources that do not have harmful interference to transmit data, so as to avoid harmful interference generated by the adjacent CeUE.

(6) D2D UE monitors harmful interference: D2D UE uses a timer and refers to the auxiliary information sent by the base station, regularly records and builds a CeUE list that causes harmful interference, so as to judge whether CeUE will cause serious interference to D2D UE, and according to The list decodes the relevant PDCCH information and obtains the resource allocation information of the CeUE; then uses the information to allocate radio resources, so that the D2D UE can avoid serious interference caused by the adjacent CeUE; the serious interference is based on the cellular user terminal list It is judged based on the resource allocation record of the resource allocation record, indicating that a certain CeUE has caused harmful interference to the D2D UE for a long time;

(7) Multiple D2D UEs compete to obtain wireless resources and establish connections, and then perform data transmission.

The main innovation advantage of the inventive method is following four points:

(A) With the assistance of the base station, the D2D UE's task of decoding the PDCCH will be greatly reduced, which can reduce the burden on the D2D UE, and at the same time make the operation of the interference avoidance method of the present invention flexible and simple. In the LTE/LTE-A system practical.

(B) By decoding the PDCCH of the CeUE that causes harmful interference in the D2D mode communication, the D2D UE can obtain their resource allocation information before transmitting data, and at the same time map the data to orthogonal resources, thereby avoiding the CeUE's interference. Subsequent D2D mode communications cause harmful interference.

(C) Using the timer to maintain the corresponding PDCCH CeUE list that needs to be decoded, the D2D UE can not only detect and monitor new interference sources, but also terminate its PDCCH when these CeUEs no longer cause harmful interference to its communication. decoding. Therefore, D2D UE can achieve the goal of effectively avoiding interference under the premise of reducing downlink signaling overhead (the reduction of downlink signaling overhead is adjustable based on the feedback from the base station, and it is also better than directly broadcasting uplink scheduling to D2D UE information overhead is much less).

(D) The method of the present invention can also be applied to the scenario where the CeUE does not use the CA technology, that is, the CC in the above scheme can be replaced by a carrier or some specific resource blocks (RBs).

Description of drawings

Figure 1 is a schematic diagram of a D2D and cellular hybrid network scenario.

Figure 2 is a schematic diagram of interference to D2D UEs caused by uplink communication in cellular mode based on CA technology.

Fig. 3 is a schematic diagram of interference caused by CeUE to D2D UE.

Fig. 4 is a schematic diagram of an interference report sent by a D2D UE to a base station.

Figure 5 is a schematic diagram of the base station identifying the CeUE that causes harmful interference to the D2D UE.

Fig. 6 is a schematic diagram of D2D UE avoiding interference from adjacent CeUE.

Fig. 7 is a sequence diagram of operation steps of the method for D2D UE to avoid interference from CeUE according to the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

The method of the present invention can be applied to the following scenarios:

Cellular transmission adopts frequency division duplex FDD (Frequency Division Duplexing) or time division duplex TDD (Time Division Duplexing) transmission mode, D2D mode communication adopts TDD mode, and D2D UE multiplexes the uplink spectrum resource of CeUE.

The cellular transmission is based on the LTE-A cellular network, but it can also be applied to other hybrid networks based on Orthogonal Frequency Division Multiple Access (OFDMA) technology. Or the scenario where the CeUE does not use the CA technology, at this time, the CC is replaced by the carrier or some set resource blocks RBs (Resource Blocks).

The basic idea of the method of the present invention is: after the base station identifies the CeUE that causes harmful interference to a specific D2D UE according to the interference information reported by the D2D UE and the historical information of the uplink scheduling stored by the base station itself, the base station sends a message to the interfered D2D UE Provide the wireless network temporary identifier RNTI and related information of the interfering CeUE to assist the D2D UE in decoding the information of the interfering CeUE; in this way, the D2D UE can predict the RNTI in the corresponding transmission time interval TTI CeUE interference, and perform corresponding flexible radio resource management operations to avoid interference.

The concrete operating steps of the inventive method are as follows:

In step 1, the base station stores the uplink scheduling history information, and broadcasts the storage duration T _record parameter of the uplink scheduling history information to the D2D UE.

In this step, the base station stores the uplink scheduling history information with a duration of multiple subframes or frames set as T _record , which is used to determine the interference caused by the CeUE to the D2D mode communication. And the base station broadcasts the time length T _record parameter to the D2D UEs in the whole cell, so that the D2D UEs must report the interference information within the T _record time. And the duration T _record is set in the communication protocol, and can be reconfigured or fixed. Due to the characteristics of uplink scheduling in cellular mode communication, CeUE will be scheduled to other CCs due to changes in channel status and load after a set period of time. Therefore, the duration T _record of the uplink scheduling history information needs to be consistent with the uplink Corresponding to the scheduling period, that is, T _record should be set to an appropriate value (for example, 100ms) to adapt to the above changes. Moreover, the threshold T _harmInt is determined by the D2D UE according to factors including channel state, quality of service requirements and transmission power, and is used to divide the interference caused by CeUE into the following two categories: harmful interference higher than T _harmInt and harmful interference lower than T harmInt Harmless Interference by T _harmInt .

Step 2. The D2D UE periodically sends an interference report to the base station: the D2D UE measures the received power of each radio resource block RB allocated to the CeUE on the CC to determine the interference received, and calculates the interference caused by the CeUE according to the threshold T _harmInt Classification, to record the time-frequency location information of resources with harmful interference, and periodically report to the base station.

Referring to Figure 3, a practical example is introduced: D2D mode communication can choose to reuse the resources of 5 CeUEs, CeUE1 and CeUE5 far away from it will cause harmless interference to D2D mode communication, and harmful interference sources are CeUE2, CeUE3 and CeUE4. However, due to the lack of location information and the fact that autonomous D2D mode communication is not controlled by the base station, it is difficult for D2D RxUE to know which CeUEs interfere with its communication. In order to solve the above problems, the D2D UE can record the harmful interference within a set time period (the length of which is T _record ), and send it to the base station as an interference report, which includes the location of the interfered resource in the time domain and frequency domain (as shown in Fig. 4). The interference report reported by the D2D UE includes: the frequency domain information of the detected resource with harmful interference and its transmission time interval. In this example, the RB number is used to identify the frequency domain position of the interfered resource, and the TTI number is used to identify its time domain position.

Step 3, the base station identifies the CeUE that causes harmful interference to the D2D UE: the base station can easily determine the interference report sent by the D2D UE and its own stored uplink scheduling history information including the RBs allocated to the CeUE. CeUE causing harmful interference.

Referring to Figure 5, the uplink scheduling information (including CeUE, time domain and frequency domain information) stored in the base station is introduced, indicating which CeUE is on which resource (the time domain is represented by the transmission time interval number, and the frequency domain is represented by the RB number) is scheduled. The D2D UE's interference report includes information in the time domain (transmission time interval number) and frequency domain (RB number). The base station can identify the CeUE that causes harmful interference to the D2D UE by comparing the uplink scheduling information and the interference report. .

Step 4, the base station sends auxiliary information to the D2D UE: In order to complete autonomous radio resource management and avoid interference from the CeUE in D2D mode communication, the D2D UE must obtain auxiliary information from the base station before decoding the PDCCH information to reduce Its decoding difficulty, and then obtain the CeUE uplink resource allocation information that causes harmful interference, so as to be able to predict the interference state. Otherwise, for D2D UE, the computational complexity of blind decoding will be very high, especially when multiple CC schemes are considered in the LTE-A system, the improvement effect of the auxiliary information on reducing the difficulty of D2D UE decoding is more significant.

The auxiliary information provided by the base station is: a list of multiple CeUE information that causes harmful interference to the D2D UE, and each CeUE information that causes harmful interference includes at least the following content: the index of the CC in the uplink scheduling information and the temporary identifier of the wireless network RNTI value. And the following optional content: transmission mode/downlink control information format, radio network temporary identifier (RNTI) type (for example: cell radio network temporary identifier (C-RNTI), semi-persistent scheduling cell radio network temporary identifier (SPS-C- RNTI) and Random Access Radio Network Temporary Identifier (RA-RNTI, etc.) and the user's semi-persistent scheduling resources and periods.

Among them, the CC index in the uplink scheduling information can help the D2D UE find out the resource location (instantaneous domain and frequency domain information) of each CeUE uplink scheduling that causes harmful interference, so as to reduce the computational difficulty of decoding the PDCCH. The RNTI value of the CeUE causing harmful interference enables the D2D UE to decode the PDCCH in the same normal way as the CeUE. The RNTI type of the CeUE that causes harmful interference can facilitate the operation of the D2D UE when decoding the uplink scheduling information. For example, for a CeUE with a C-RNTI, uplink scheduling information is required to be sent in every TTI. This means that the D2D UE must try to decode the uplink scheduling information in each TTI to track the resource allocation of the CeUE. For a CeUE with SPS-C-RNTI, its resource allocation information is semi-static, so the uplink scheduling information is valid within a certain period of time, in other words, when the CeUE's uplink scheduling information is valid During the period, the D2D UE does not need to decode the uplink scheduling information of the CeUE multiple times.

Step 5, the D2D UE decodes the PDCCH to avoid interference: using the auxiliary information of the base station, the D2D UE decodes and obtains the PDCCH containing the CeUE uplink scheduling information that interferes with the D2D RxUE, and obtains the corresponding resource allocation; thus, The D2D UE no longer reuses the resources of the CeUE that causes harmful interference to it, but uses the remaining resources that do not have harmful interference to transmit data, so as to avoid harmful interference generated by the adjacent CeUE. This step includes the following operations:

(51) After the D2D UE receives the auxiliary information from the base station, before performing the radio resource management operation, the D2D sending and receiving ends TxUE and RxUE first exchange the RNTI information of the CeUE that causes harmful interference, and then coordinate the resources allocated by the two ( At least make the D2D RxUE aware of the interference status of the receiver), so that the D2D mode communication can better avoid interference.

(52) With the assistance of the base station, the D2D UE decodes to obtain the PDCCH containing the CeUE uplink scheduling information that interferes with the D2D RxUE, and obtains the corresponding resource allocation. In this way, the D2D UE no longer reuses the resources of the CeUE that causes harmful interference to it, but uses the remaining resources that do not have harmful interference to transmit data to avoid interference from adjacent CeUEs.

Referring to Figure 6, the principle of D2D UE avoiding harmful interference of CeUE is introduced. As already given in Figure 3, CeUE2, CeUE 3, and CeUE 4 can cause harmful interference to D2D UEs, and using resources allocated to CeUEs located far away will not cause harmful interference to D2D UEs, therefore, correspondingly in Figure 3 6 reflects the remote CeUE resources that D2D users can use.

Step 6, D2D UE monitors harmful interference: In order to keep monitoring those CeUEs that cause harmful interference, D2D UE uses a timer and refers to the auxiliary information sent by the base station, regularly records and builds a list of CeUEs that cause harmful interference (CeUE_list) , so as to judge whether the CeUE will cause serious interference to the D2D UE, and decode the relevant PDCCH information and obtain the resource allocation information of the CeUE according to the list. The information is then used to allocate radio resources, so that the D2D UE can avoid severe interference generated by the adjacent CeUE. The so-called "serious interference" is determined according to the resource allocation records in the cellular user terminal list, which is different from the usual "harmful interference", which means that a certain CeUE has caused harmful interference to the D2D UE for a long time.

This step includes the following operations:

(61) The D2D UE uses the timer and refers to the auxiliary information broadcast by the base station, stores the relevant information of the CeUE causing harmful interference in the cellular user terminal list (as shown in Table 1 below), and decides whether to select from the cellular user terminal list accordingly. Remove or keep CeUE. The content of the cellular user terminal list includes: serial numbers of cellular user terminals, timers and interference records. The value of the timer depends on an integer multiple of the time for measuring interference determined by actual needs, and the maximum value of the timer is T _record ; the interference record indicates whether the CeUE causes harmful interference to the D2D mode communication, if within the set time period , if the CeUE causes harmful interference to the D2D mode communication, it is recorded as "1", otherwise, it is recorded as "0". In addition, when a new CeUE causing harmful interference occurs, it should be entered in the table.

Table 1 List of cellular user terminals

(62) When the timer returns to zero, the D2D UE decides whether to continue to observe the CeUE or delete it from the list according to the interference records and judgment criteria in the CeUE list.

The decision criterion is the set decision threshold ε, which is used to judge whether the number of interference records in each timer setting period is not greater than ε for each CeUE. If so, it is considered that the CeUE will not cause serious damage to the D2D UE. Otherwise, the D2D UE should avoid the serious interference of the CeUE to it, and keep it in the list and continue to observe it.

The following example illustrates how the D2D UE uses the timer to maintain the list of cellular user terminals:

Assuming that the time of each measurement is 10ms, therefore, the timer is set to 100ms, and a total of 10 measurements are made. Let N be the number of occurrences of "0" in the interference record (0≤N≤10), and set ε=5. After the observation time of 100ms ends, if N<5 (as shown in CeUE1 and CeUE3 in Figure 7), then It is considered that the CeUE will cause severe interference to the communication in the D2D mode, and this CeUE needs to be kept in the list of cellular user terminals. Then the D2D UE restarts the timer and continues to observe it. On the contrary, if N≥5 (such as CeUE2 in Fig. 7), this CeUE will be deleted from the cellular user terminal list after the timer expires. After 100 ms, the list of cellular user terminals is updated as shown in Table 2 below.

Table 2 List of cellular user terminals

In step 7, multiple D2D UEs compete to obtain wireless resources and establish connections, and then perform data transmission.

Referring to Fig. 7, a sequence diagram of operation steps of the D2D UE-to-CeUE interference avoidance method of the present invention is introduced:

(1) The base station performs the operation stipulated in the communication protocol: broadcasting the parameter T _record to the D2D TxUE and the D2D RxUE.

(2) D2D RxUE perceives the interference from CeUE, measures the interference status on a specific CC, and then records the time-frequency information of harmful interference to D2D mode communication according to the threshold T _harmInt , and regularly reports such information to the base station.

(3) The base station stores uplink scheduling information within T _record time. According to the time-frequency interference information and the history information of uplink scheduling, the base station determines the CeUE causing harmful interference to a specific D2D UE.

(4) The base station broadcasts the RNTI and other auxiliary information of the CeUE to the interfered D2D RxUE.

(5) D2D TxUE and D2D RxUE exchange the RNTI information of the CeUE causing harmful interference.

(6) D2D RxUE uses the auxiliary information from the base station to decode the scheduling information of PDCCH, learns the CeUE causing harmful interference, and regularly records it in a list. This method is used to allocate radio resources and avoid serious interference of the CeUE.

(7) D2D RxUE starts to transmit data to D2D TxUE.

The present invention has carried out many implementation tests, and the result of experiment is successful, has realized the purpose of the invention.

Claims (7)

1. A method for avoiding interference caused by cellular communication to D2D communication in a cellular-terminal direct-connected D2D hybrid network, characterized in that: the base station identifies the After the cellular user CeUE that causes harmful interference to a specific D2D UE, the base station provides the interfered D2D UE with the wireless network temporary identifier RNTI information of the interfering CeUE to assist the D2D UE in decoding the interfering CeUE information; in this way, the D2D UE can predict the interference situation of the CeUE in the corresponding transmission time interval TTI, and perform corresponding radio resource management operations to avoid interference; the method includes the following steps: (1) The base station stores the uplink scheduling history information, and broadcasts the storage duration T _record parameter of the uplink scheduling history information to the D2D UE; (2) D2D UE periodically sends interference reports to the base station: D2D UE measures the received power of each radio resource block RB allocated to CeUE on the CC, and classifies the interference caused by CeUE according to the threshold T _harmInt to record the occurrence of harmful interference Resource time-frequency location information, and periodically reported to the base station; the threshold T _harmInt is determined by the D2D UE according to factors including channel status, service quality requirements, and transmission power, and is used to divide the interference caused by CeUE into the following two categories : Harmful interference higher than T _harmInt and harmless interference lower than T _harmInt ; (3) The base station identifies the CeUE that causes harmful interference to the D2D UE: the base station judges that it causes harmful interference to the D2D UE by comparing the interference report sent by the D2D UE with the uplink scheduling history information stored by itself including each RB allocated to the CeUE. interfering CeUE; (4) The base station sends auxiliary information to the D2D UE: In order to complete autonomous radio resource management and avoid interference from the CeUE in D2D mode communication, the D2D UE must obtain auxiliary information from the base station before decoding the PDCCH information to reduce Its decoding difficulty, and then know the CeUE uplink resource allocation information that causes harmful interference to it, so that the interference state can be predicted; the auxiliary information includes at least: the index of the CC in the uplink scheduling information and the wireless network temporary identifier RNTI value, in LTE -When multiple CC schemes are considered in the A system, the improvement effect of the auxiliary information on reducing the difficulty of D2D UE decoding is more significant; (5) The D2D UE decodes the PDCCH to avoid interference: with the auxiliary information of the base station, the D2D UE decodes the PDCCH containing the CeUE uplink scheduling information that interferes with the D2D RxUE, and obtains the corresponding resource allocation; thus, The D2D UE no longer reuses the resources of the CeUE that causes harmful interference to it, but uses the remaining resources that do not have harmful interference to transmit data, so as to avoid harmful interference generated by the adjacent CeUE; (6) D2D UE monitors harmful interference: D2D UE uses a timer and refers to the auxiliary information sent by the base station, regularly records and builds a CeUE list that causes harmful interference, so as to judge whether CeUE will cause serious interference to D2D UE, and according to The list decodes the relevant PDCCH information and obtains the resource allocation information of the CeUE; then uses the information to allocate radio resources, so that the D2D UE can avoid serious interference caused by the adjacent CeUE; the serious interference is based on the cellular user terminal list It is judged based on the resource allocation record of the resource allocation record, indicating that a certain CeUE has caused harmful interference to the D2D UE for a long time; (7) Multiple D2D UEs compete to obtain wireless resources and establish connections, and then perform data transmission. 2. The method according to claim 1, characterized in that: the method is applicable to the following scenarios: LTE-A-based cellular transmission adopts frequency division duplex FDD or time division duplex TDD mode, D2D mode communication adopts TDD mode , and the D2D UE reuses the uplink spectrum resources of the CeUE. 3. The method according to claim 1, characterized in that: the method is applicable to the following scenarios: a hybrid network based on Orthogonal Frequency Division Multiple Access (OFDMA) technology, or a scenario where CeUE does not use CA technology, at this time, CC Replaced by the carrier or some set resource block RBs. 4. The method according to claim 1, characterized in that: the base station stores uplink scheduling history information with a duration of multiple subframes or frames set as T _record , which is used to determine the interference caused by CeUE to D2D mode communication ; and the base station broadcasts the duration T _record parameter to the D2D UEs in the entire cell, so that the D2D UE must report the interference information within the T _record time; the duration T _record is set in the protocol and can be reconfigured or Fixed; due to the characteristics of uplink scheduling in cellular mode communication, CeUE will be scheduled to other CCs after a set period of time due to changes in channel status and load, so the duration T _record of the uplink scheduling history information must be the same as The uplink scheduling period corresponds to adapt to the above changes. 5. The method according to claim 1, characterized in that: in the step (4), the auxiliary information from the base station is a list of multiple CeUE information that causes harmful interference to the D2D UE, and each of the CeUE information that causes harmful interference Each CeUE information includes at least: the index of the CC in the uplink scheduling information and the value of the radio network temporary identifier RNTI, and the following optional content: transmission mode/downlink control information format, including the cell radio network temporary identifier (C- RNTI), semi-persistent scheduling cell radio network temporary identifier (SPS-C-RNTI) and random access radio network temporary identifier (RA-RNTI) wireless network temporary identifier type and user's semi-persistent scheduling resource and cycle; wherein, The CC index in the uplink scheduling information is used to help the D2D UE find out the resource position of each CeUE uplink scheduling that causes harmful interference, so as to reduce the calculation difficulty of decoding the PDCCH; The RNTI value of the CeUE causing harmful interference enables the D2D UE to decode the PDCCH in the same manner as the CeUE; The RNTI type of the CeUE causing harmful interference is helpful for the D2D UE to simplify the operation when decoding the uplink scheduling information. 6. The method according to claim 1, characterized in that: said step (5) comprises the following operations: (51) After the D2D UE receives the auxiliary information from the base station, before performing radio resource management operations, the D2D sending and receiving ends TxUE and RxUE first exchange the RNTI information of the CeUE that causes harmful interference, and then coordinate the resources allocated by the two, To enable D2D mode communication to better avoid interference; (52) With the assistance of the base station, the D2D UE decodes and obtains the PDCCH containing the CeUE uplink scheduling information that interferes with the D2D RxUE, and obtains the corresponding resource allocation; in this way, the D2D UE will no longer multiplex and cause harmful interference to it The resources of the CeUE are used, and the remaining resources without harmful interference are used to transmit data, so as to avoid interference from adjacent CeUEs. 7. The method according to claim 1, characterized in that: said step (6) comprises the following operations: (61) The D2D UE uses the timer and refers to the auxiliary information broadcast by the base station, stores the relevant information of the CeUE causing harmful interference in the cellular user terminal list, and decides whether to remove or retain the CeUE from the cellular user terminal list; The content of the list of cellular user terminals includes: serial numbers of cellular user terminals, timers and interference records; the timer value depends on the integer multiple of the time for a measurement of interference determined by actual needs, and the maximum value of the timer is T _record ; The interference record indicates whether the CeUE causes harmful interference to the D2D mode communication. If the CeUE causes harmful interference to the D2D mode communication within the set time period, the record is "1", otherwise, it is recorded as "0"; (62) When the timer returns to zero, the D2D UE decides whether to continue to observe the CeUE or delete it from the list according to the interference records and decision criteria in the CeUE list; the decision criterion is the set decision threshold ε, It is used to judge for each CeUE whether the number of interference records in each timer setting period is not greater than ε, if so, it is considered that the CeUE will not cause serious interference to the D2D UE and delete it; otherwise, the D2D UE It should avoid the serious interference of the CeUE to it, but keep it in the list and continue to observe it.