CN103068049A - Method of avoiding interference to device-to-device (D2D) communications caused by cellular communications in honeycomb and D2D hybrid network - Google Patents
Method of avoiding interference to device-to-device (D2D) communications caused by cellular communications in honeycomb and D2D hybrid network Download PDFInfo
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Abstract
A method of avoiding interference to device-to-device (D2D) communications caused by cellular communications in a honeycomb and D2D hybrid network includes that according to interference information reported by D2D user equipment (EU) and historical information dispatched by uplink stored by a base station, after the base station distinguishes cellular user equipment (CeUE) of a cellular user which causes harmful interference to a particular D2D UE, the base station provides radio network temporary identifier (RNTI) causing the interference to the D2D UE and related information for the disturbed D2D UE to assist the D2D UE to decode CeUE information causing the interference to the D2D UE. By using the method, the D2D UE is capable of forecasting disturbed condition of the CeUE in a corresponding transmission time interval (TTI) and performing a corresponding radio resource management operation to avoid the harmful interference to the subsequent D2D mode communications caused by the CeUE. Through the assist of the base station, operation of calculating and decoding of a physical downlink control channel (PDCCH) by the D2D UE is simple, flexible and convenient and workable in a long term evolution (LTE)/LTE-A system.
Description
Technical field
The present invention relates to the straight-through D2D(Device-to-Device of a kind of honeycomb and terminal) in the hybrid network, communication causes the method for interference to D2D to avoid cellular communication, belongs to the technical field of radio communication.
Background technology
Present cordless communication network mainly is divided into two kinds: cellular network and Ad-hoc(are point-to-point) network.The communication characteristics of these two kinds of networks are described below respectively:
Cellular network: its overlay area is divided into a plurality of cellular cells, and each cellular cell has the base station that works in respectively separately different frequency.User terminal UE(User Equipment) communicate by base station and other user terminal, this communication mode is called honeycomb mode.Even when reception is very near with the distance that sends two terminals, also must communicate by the base station.
The Ad-hoc network: be the mobile network who does not have wired infrastructure to support, its all nodes are made of portable terminal.By direct-connected (or by relaying) direct communication, this communication mode is called the D2D pattern between each UE.
In honeycomb mode, because the transmission between base station eNodeB (Evolved Node B) the centralized control UE, therefore it can be managed and the Radio Resource of controlling network and interference easily, but its remarkable shortcoming is effectively to utilize Radio Resource.For example: two very near UE of distance communicate the twice that employed Radio Resource is the D2D pattern by honeycomb mode.Therefore, in order to obtain higher throughput of system, wireless network in the future is likely the multiple network coexisting state that comprises cellular network and Ad-hoc network.
Referring to Fig. 1, introduce the hybrid network reference model of a kind of honeycomb and D2D.Wherein, UE both can honeycomb mode work, data communication device is crossed the base station send to other UE, also can data directly be issued other UE by the D2D pattern.Compare with single cellular network, this hybrid network can obtain better systematic function.
Should be greater than the requirement of 100MHz in order to reach maximum bandwidth, 3GPP has proposed carrier aggregation CA(Carrier Aggregation) technology, be about to a plurality of member carrier CC(Component Carriers) polymerization, so that needed bandwidth (the CC here may be discontinuous) to be provided, it can improve the performance of LTE-A cellular network.The D2D pattern communication can multiplexingly adopt the LTE-A network radio resources of CA technology, and still, also there is the interference problem of introducing because of resource multiplex in it.
The below introduces in honeycomb and D2D hybrid network, the prior art situation that the D2D pattern communication is avoided the interference of cellular communication: this technical scheme is under the hybrid communication network scene of D2D pattern and honeycomb mode, during the multiplexing phone user's uplink resource of D2D user, avoid cellular user terminal CeUE(Cellular User Equipment) to D2D user terminal D2D UE(D2D Equipmen) cause the method for interference.
Its application scenarios is as follows: UE both can work in the D2D pattern, also can work in traditional honeycomb mode.Described cellular network refers to worldwide interoperability for microwave access WiMAX(Worldwide Interoperability forMicrowave Access) cellular network, and user terminal can be shared the resource of D2D pattern and honeycomb mode.In this technical scheme, because the up link UL(Uplink of CeUE) RRM RRM(Radio Resource Management) information, namely based on the uplink map UL-MAP(Uplink-MAP of WiMAX system) can be decoded by D2D UE, D2D UE can utilize uplink radio resources management information that resource is effectively distributed, thereby avoids the interference from CeUE.
The advantage of this scheme is: because this scheme is mainly based on the WiMAX cellular network, the WiMAX system signaling is open, therefore, the computation burden of physical downlink control channel PDCCH (the Physical Downlink Control CHannel) signaling of decoding CeUE is not very large.Its inferior position is as follows:
In the LTE-A cellular system, signaling is not as being open among the WiMAX, therefore can only carry out blind solution to PDCCH, and this will bring a large amount of amounts of calculation.In addition, owing to having introduced the CA technology, the PDCCH on CC may comprise the control information of other carrier wave; The PDCCH on the CC of decoding can not obtain all control informations of a CeUE.Therefore the D2D UE PDCCH of all carrier waves that need to decode carry out a large amount of decoding computings, and this is not gear to actual circumstances to use very much.If after having introduced the CA technology, still use such scheme that the PDCCH of CeUE is carried out total blindness's solution, just, power consumption higher to hardware requirement will be quite large like that, and the income that decoding PDCCH brings also can reduce.
In the hybrid network of honeycomb mode and D2D pattern, the resource that D2D UE can autonomous multiplexing CeUE.In such scheme, D2D UE is exactly the uplink communication resource of multiplexing CeUE.Yet, when the multiplexing CC of D2D UE, itself and use between the CeUE of these CC and exist the problem that interferes with each other.
Referring to Fig. 2, when introducing the CC of the multiplexing CeUE of D2D UE, be subjected to the example that CeUE disturbs: wherein, D2D TxUE and D2D RxUE are respectively D2D and send user terminal (User Equipment of Transmission) and receive user terminal (User Equipment of Reception).Among the figure, when D2D TxUE used No. 1 CC to carry out the D2D pattern communication, D2D RxUE can detect the interference of CeUE.This is because near CeUE is using No. 1, No. 3 CC to carry out uplink.
In the above-mentioned example, introduced the CA technology in the hybrid network of LTE-A honeycomb mode and D2D pattern after, the PDCCH on the CC that decodes can not obtain whole control informations of a CeUE, need to the decode PDCCH of all carrier waves of D2DUE, such amount of calculation can be very large, is unpractical.Therefore, the CeUE information how D2D UE decodes and produce to disturb, and then avoid CeUE to the interference of D2D UE is a problem of needing solution badly, also is a focus problem paying close attention to of scientific and technical personnel in the industry.
Summary of the invention
In view of this, the purpose of this invention is to provide in the straight-through D2D hybrid network of a kind of honeycomb and terminal, cellular communication is to the interference avoidance method of D2D communication, the method is by after introducing the CA technology, can effectively avoid the CeUE uplink communication to the interference of D2D pattern communication, and easy and simple to handle, computation complexity significantly reduces.
In order to achieve the above object, the invention provides the straight-through D2D(Device-to-Device of a kind of honeycomb and terminal) in the hybrid network, avoid cellular communication that D2D is communicated by letter and cause the method for interference, it is characterized in that: the historical information of the uplink scheduling of the interfere information that the base station reports according to D2D UE and base station self storage, after identification causes the phone user CeUE of harmful interference to certain specific D2D UE, the base station provides the Radio Network Temporary Identifier RNTI(Radio Network Temporary Identifier that it is caused the CeUE of interference to disturbed D2D UE) and relevant information, be used for auxiliary this D2D UE the CeUE information that causes interference to it is decoded; Take this mode, D2D UE can predict at corresponding Transmission Time Interval TTI(Transmission Time Interval) in the disturbed condition of CeUE, and carry out corresponding radio resource management operations, to avoid interference.
Described method comprises following operating procedure:
(1) base station stored uplink scheduling historical information, and with the storage duration T of uplink scheduling historical information
RecordParameter is broadcast to D2D UE;
(2) D2D UE sends jamming report to the base station cycle: D2D UE is by measuring each wireless resource block RB(Resource Block that distributes to CeUE on the CC) received power, and according to threshold value T
HarmIntThe interference that CeUE causes is classified, occur the resource time-frequency positional information of harmful interference with record, and the cycle reports to the base station;
(3) CeUE that D2D UE is caused harmful interference is differentiated in the base station: the CeUE that D2D UE is caused harmful interference is judged by the jamming report of relatively D2D UE transmission and the uplink scheduling historical information that comprises each RB that distributes to CeUE of himself storage in the base station;
(4) base station sends supplementary to D2D UE: in order to finish autonomous RRM and the interference of avoiding from CeUE in the D2D pattern communication, D2D UE is before decoding to PDCCH information, must obtain the supplementary from the base station, to reduce its decoding difficulty, and then know the CeUE ascending resource assignment information that causes harmful interference, so that can the predicted interference state; This supplementary comprises at least: the index of the CC in the uplink scheduling information and Radio Network Temporary Identifier RNTI value, and when considering a plurality of CC scheme in the LTE-A system, it is more remarkable that this supplementary reduces the improvement effect of D2D UE decoding difficulty;
(5) D2D UE decodes to PDCCH, and to avoid interference: by the supplementary of base station, D2D UE decoding obtains to contain the PDCCH that D2D RxUE is caused the CeUE uplink scheduling information of interference, and obtains corresponding resource distribution; Like this, D2D UE is just no longer multiplexing to cause the resource of the CeUE of harmful interference to it, but utilizes the remaining resource transmission data that do not have harmful interference, to avoid closing on the harmful interference that described CeUE produces.
(6) D2D UE monitors harmful interference: the supplementary that D2D UE uses timer and reference base station to send, time recording and one of structure cause the CeUE tabulation of harmful interference, whether can produce severe jamming to D2D UE in order to judge CeUE, and the PDCCH information and the resource allocation information that obtain described CeUE relevant according to this list-decoding; D2D UE recycles this information distribution Radio Resource, so that can avoid closing on the severe jamming that described CeUE produces;
(7) obtain Radio Resource by competitive way between a plurality of D2D UE and connect, then carry out transfer of data.
The main innovation advantage of the inventive method is following 4 points:
(A) pass through the auxiliary of base station, D2D UE can significantly reduce the decode operation task of PDCCH, can alleviate like this burden of D2D UE, simultaneously so that the flexible operation of interference avoidance method of the present invention, easy is practical in the LTE/LTE-A system.
(B) by causing the PDCCH of the CeUE of harmful interference to decode to the D2D pattern communication, D2D UE is before the transmission of data, just can know their resource allocation information, simultaneously by with data-mapping on the resource of quadrature, thereby avoid CeUE that subsequently D2D pattern communication is caused harmful interference.
(C) utilize timer to safeguard the CeUE tabulation of the corresponding PDCCH that needs decoding, D2D UE not only can survey and monitor new interference source, can also when these CeUE no longer cause harmful interference to its communication, stop the decoding to its PDCCH.So, D2D UE can be under the prerequisite that reduces the downlink signaling expense, finish the target (feedback that the minimizing of downlink signaling expense is based on the base station is adjustable, simultaneously also than directly having lacked much to the expense of D2D UE broadcast uplink schedule information) that effectively avoids interference.
(D) the inventive method can also be applied to the scene that CeUE does not use the CA technology, is about to CC in the such scheme with carrier wave or some specific Resource Block RBs(Resource Blocks) substitute and get final product.
Description of drawings
Fig. 1 is D2D and honeycomb hybrid network scene schematic diagram.
Fig. 2 is based on the honeycomb mode uplink communication of CA technology to the interference schematic diagram of D2D UE.
Fig. 3 is that CeUE produces the schematic diagram that disturbs to D2D UE.
Fig. 4 is the jamming report schematic diagram that D2D UE sends to the base station.
Fig. 5 is that the CeUE schematic diagram that D2D UE is caused harmful interference is differentiated in the base station.
Fig. 6 is the interference schematic diagram that D2D UE avoids closing on CeUE.
Fig. 7 is that D2D UE of the present invention avoids the operating procedure sequential chart from the method for CeUE interference.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
The inventive method can be applied to following scene:
Cellular transmission adopts the transmission means of FDD (Frequency Division Duplexing) or TDD (Time Division Duplexing), the D2D pattern communication adopts the TDD mode, and the uplink spectrum resource of the multiplexing CeUE of D2D UE.
Cellular transmission wherein still, also can be applicable to other based on OFDM OFDMA(Orthogonal Frequency Division Multiple Access based on the LTE-A cellular network) hybrid network of technology.Perhaps CeUE does not use the scene of CA technology, and at this moment, CC is set Resource Block RBs(Resource Blocks by carrier wave or some) substitute.
The basic ideas of the inventive method are: the historical information of the uplink scheduling of the interfere information that the base station reports according to D2D UE and base station self storage, after identification causes the CeUE of harmful interference to certain specific D2D UE, the base station provides Radio Network Temporary Identifier RNTI and the relevant information that it is caused the CeUE of interference to disturbed D2D UE, be used for auxiliary this D2D UE decoding it is caused the information of the CeUE of interference; Take this mode, D2D UE can predict the CeUE disturbed condition in corresponding Transmission Time Interval TTI, and carries out the radio resource management operations of respective flexible, to avoid interference.
The concrete operation step of the inventive method is as follows:
In this step, the duration that base station stored is set a plurality of subframes or frame is T
RecordThe uplink scheduling historical information, be used for to determine the interference that CeUE produces the D2D pattern communication.And by the base station with this duration T
RecordParameter is broadcast to the D2D UE in the whole residential quarter, so that D2D UE must be at T
RecordReport interfere information in time.And this duration T
RecordIn communication protocol, arrange, and can reconfigure or fix.Because of the characteristics of honeycomb mode communication uplink scheduling, CeUE can be scheduled for other CC because of the variation of channel status and load, therefore the duration T of this uplink scheduling historical information after setting the period
RecordNeed to be corresponding with the uplink scheduling cycle, namely will be with T
RecordBe set to a suitable value (for example 100ms), to adapt to above-mentioned variation.And, this threshold value T
HarmIntBe to be determined according to the factor that comprises channel status, quality of service requirement and through-put power by D2D UE, the interference that is used for CeUE is caused is divided into following two classes: be higher than T
HarmIntHarmful interference and be lower than T
HarmIntHarmless interference.
Referring to Fig. 3, introduce an actual example: the D2D pattern communication can be selected the resource of multiplexing 5 CeUE, from its far CeUE1 and CeUE5 the D2D pattern communication is produced harmless interference, and the harmful interference source is CeUE2, CeUE3 and CeUE4.Yet because shortage and the autonomous D2D pattern communication of positional information are not controlled by the base station, D2D RxUE is difficult to know which CeUE has produced interference to its communication.For addressing the above problem, D2D UE can record the setting-up time section, and (its time length is T
Record) in harmful interference, send to the base station as jamming report, comprise the time domain that is disturbed resource and the position (as shown in Figure 4) of frequency domain in the report.Include in the jamming report that D2D UE reports: frequency domain information and the Transmission Time Interval thereof of the resource that has harmful interference that detects.In this example, used the frequency domain position that identifies the resource that is interfered for RB number, identify its time-domain position with TTI number.
Referring to Fig. 5, introduce the uplink scheduling information (comprising CeUE, time domain and frequency domain information) of storing in the base station, show which CeUE is scheduled on which resource (time domain is with Transmission Time Interval number expression, and frequency domain represents with RB number).And the jamming report of D2D UE includes: the information of time domain (Transmission Time Interval number) and frequency domain (RB number), thus the base station can be by relatively uplink scheduling information and jamming report identify the CeUE that D2D UE is caused harmful interference.
The supplementary that the base station provides is: D2D UE is caused the tabulation of a plurality of CeUE information of harmful interference, cause each CeUE information of harmful interference to comprise at least following content: the index of the CC in the uplink scheduling information and Radio Network Temporary Identifier RNTI value.And following optional content: sending mode/descending control information format, Radio Network Temporary Identifier (RNTI) type (for example: Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (C-RNTI), semi-persistent scheduling Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (SPS-C-RNTI) and random access radio network temporary mark (RA-RNTI) etc.) and user's semi-static scheduling resources and cycle.
Wherein, the resource location (being time domain and frequency domain information) of each CeUE uplink scheduling that the CC index in the uplink scheduling information can help D2D UE to find out to cause harmful interference is to reduce the difficulty in computation that PDCCH is decoded.D2D UE causes the RNTI value of the CeUE of harmful interference, so that can adopt the normal mode decoding PDCCH identical with this CeUE.Operation when causing the RNTI type of the CeUE of harmful interference can help D2D UE to carry out the uplink scheduling information decoding is simple and easy.For example, for a CeUE with C-RNTI, uplink scheduling information requires to be sent out on each TTI.This just means D2D UE must attempt decoding uplink scheduling information among each TTI, and the resource that is used for following the tracks of CeUE is distributed.And for one with for the CeUE of SPS-C-RNTI, its resource allocation information is semi-static, therefore uplink scheduling information is effective within certain time period, in other words, in the effectual time of the uplink scheduling information of CeUE, D2D UE does not need repeatedly the uplink scheduling information of CeUE to be decoded.
(51) after D2D UE receives the supplementary of base station, before carrying out radio resource management operations, the transmitting-receiving two-end TxUE of D2D and RxUE cause first the RNTI information of the CeUE of harmful interference alternately, coordinate again the resource (at least so that D2D RxUE is known the disturbance regime of receiver) that both distribute separately, so that the D2D pattern communication avoids interference better.
(52) auxiliary by the base station, D2D UE decoding obtains to contain the PDCCH that D2D RxUE is caused the CeUE uplink scheduling information of interference, and obtains corresponding resource and distribute.Like this, D2D UE is just no longer multiplexing to cause the resource of the CeUE of harmful interference to it, and utilizes remaining, as not have harmful interference resource transmission data, to avoid the interference from the CeUE that closes on.
Referring to Fig. 6, introduce the principle that D2D UE avoids the harmful interference of CeUE.As what provided among Fig. 3, CeUE2, CeUE3, CeUE4 can cause harmful interference to D2D UE, be positioned at CeUE resource at a distance and just can not make D2D UE be subject to harmful interference and use to distribute to, therefore, the resource that correspondingly in Fig. 6, has reflected the operable distant place CeUE of D2D user.
Step 6, D2D UE monitors harmful interference: in order to keep those are caused the monitoring of the CeUE of harmful interference, the supplementary that D2D UE uses timer and reference base station to send, time recording and one of structure cause the CeUE tabulation (CeUE_list) of harmful interference, whether can produce severe jamming to D2DUE in order to judge CeUE, and the PDCCH information and the resource allocation information that obtain described CeUE relevant according to this list-decoding.D2D UE recycles this information distribution Radio Resource, so that can avoid closing on the severe jamming that described CeUE produces.So-called " severe jamming " is to judge according to the resource assignment record situation in the cellular user terminal tabulation, is different from common " harmful interference ", and it is that certain CeUE of expression produces harmful interference for a long time to this D2D UE.
This step comprises following content of operation:
(61) D2D UE uses the supplementary of timer and reference base station broadcasting, the relevant information that causes the CeUE of harmful interference is stored in cellular user terminal tabulation (as shown in table 1 below), and determines accordingly whether from the cellular user terminal tabulation, to remove or keep CeUE.This cellular user terminal list content comprises: cellular user terminal sequence number, timer and disturbance records.Timer numerical value depends on the integral multiple of the time of the one-shot measurement interference that actual needs determines, and the maximum of timer is T
RecordDescribed disturbance records represents whether CeUE causes harmful interference to the D2D pattern communication, if in the setting-up time section, CeUE has caused harmful interference to the D2D pattern communication, and then it is recorded as " 1 ", otherwise, be designated as " 0 ".In addition, when occur one new when causing the CeUE of harmful interference, it should be inserted form.
The tabulation of table 1 cellular user terminal
(62) when timer makes zero, D2D UE determines whether to continue to observe this CeUE according to disturbance records and decision rule in the CeUE tabulation, perhaps from this tabulation with its deletion.
Decision rule is the decision threshold ε that arranges, and is used for each CeUE is judged whether its number of times that occurs disturbance records within each timer setting cycle time is not more than ε, if think that then this CeUE can not cause severe jamming and delete it D2D UE; Otherwise D2D UE just should avoid this CeUE to its severe jamming, and it is retained in this tabulation and continues observation.
The below illustrates D2D UE and how to safeguard the cellular user terminal tabulation with timer:
Suppose that each time of measuring is 10ms, therefore, time of timer is set as 100ms, measure altogether 10 times.If N is the number of times (0≤N≤10) of the appearance of " 0 " in the disturbance records, and establishes ε=5.After the observation time of 100ms finishes, if the CeUE1 among N＜5(such as Fig. 7 and CeUE3), think that then CeUE can cause severe jamming to the D2D pattern communication, this CeUE need to be retained in the cellular user terminal tabulation.Then D2D UE is restarted timer, and continues it is observed.Otherwise, if the CeUE2 among N 〉=5(such as Fig. 7), then after timer finishes, this CeUE is deleted from the cellular user terminal tabulation.Cellular user terminal tabulation behind the 100ms is through upgrading the situation as shown in table 2 below that becomes.
The tabulation of table 2 cellular user terminal
Step 7 obtains Radio Resource by competitive way between a plurality of D2D UE and connects, and then carries out transfer of data.
Referring to Fig. 7, introduce D2D UE of the present invention to the operating procedure sequential chart of the interference avoidance method of CeUE:
(1) operation of base station executive communication agreement regulation: to D2D TxUE and D2D RxUE broadcast parameter T
Record
(2) D2D RxUE perceives the interference from CeUE, and measures the disturbance regime on specific CC, again according to threshold value T
HarmIntRecord produces the Time-Frequency Information of harmful interference to the D2D pattern communication, regularly report this type of information to the base station.
(3) base station is at T
RecordTime memory storage uplink scheduling information.According to the historical information of time-frequency interfere information and uplink scheduling, the CeUE of harmful interference is determined specific D2D UE is caused in the base station.
(4) base station is to the D2D RxUE broadcasting RNTI that is disturbed and other supplementary of CeUE.
(5) D2D TxUE and D2D RxUE exchange the RNTI information of the CeUE that causes harmful interference mutually.
(6) D2D RxUE uses the schedule information from the supplementary decoding PDCCH of base station, knows the CeUE that causes harmful interference, and periodically it is recorded in the tabulation.Make the distribution that realizes in this way Radio Resource, avoid the severe jamming of CeUE.
(7) D2D RxUE begins the transmission of data to D2D TxUE.
The present invention has carried out repeatedly implementing test, and the result of experiment is successfully, has realized goal of the invention.
Claims (10)
1. in the straight-through D2D hybrid network of a honeycomb and terminal, avoid cellular communication that D2D is communicated by letter and cause the method for interference, it is characterized in that: the historical information of the uplink scheduling of the interfere information that the base station reports according to D2D UE and base station self storage, after identification causes the phone user CeUE of harmful interference to certain specific D2D UE, the base station provides Radio Network Temporary Identifier RNTI and the relevant information that it is caused the CeUE of interference to disturbed D2D UE, be used for auxiliary this D2D UE decoding it is caused the information of the CeUE of interference; Take this mode, D2D UE can predict the disturbed condition of the CeUE in corresponding Transmission Time Interval TTI, and carries out corresponding radio resource management operations, to avoid interference.
2. method according to claim 1, it is characterized in that: described method comprises following operating procedure:
(1) base station stored uplink scheduling historical information, and with the storage duration T of uplink scheduling historical information
RecordParameter is broadcast to D2D UE;
(2) D2D UE sends jamming report to the base station cycle: D2D UE is by measuring the received power of distributing to each wireless resource block RB of CeUE on the CC, and according to threshold value T
HarmIntThe interference that CeUE causes is classified, occur the resource time-frequency positional information of harmful interference with record, and the cycle reports to the base station;
(3) CeUE that D2D UE is caused harmful interference is differentiated in the base station: the CeUE that D2D UE is caused harmful interference is judged by the jamming report of relatively D2D UE transmission and the uplink scheduling historical information that comprises each RB that distributes to CeUE of himself storage in the base station;
(4) base station sends supplementary to D2D UE: in order to finish autonomous RRM and the interference of avoiding from CeUE in the D2D pattern communication, D2D UE is before decoding to PDCCH information, must obtain the supplementary from the base station, to reduce its decoding difficulty, and then know the CeUE ascending resource assignment information that it is caused harmful interference, so that can the predicted interference state; This supplementary comprises at least: the index of the CC in the uplink scheduling information and Radio Network Temporary Identifier RNTI value, and when considering a plurality of CC scheme in the LTE-A system, it is more remarkable that this supplementary reduces the improvement effect of D2D UE decoding difficulty;
(5) D2D UE decodes to PDCCH, and to avoid interference: by the supplementary of base station, D2D UE decoding obtains to contain the PDCCH that D2D RxUE is caused the CeUE uplink scheduling information of interference, and obtains corresponding resource distribution; Like this, D2D UE is just no longer multiplexing to cause the resource of the CeUE of harmful interference to it, but utilizes the remaining resource transmission data that do not have harmful interference, to avoid closing on the harmful interference that described CeUE produces.
(6) D2D UE monitors harmful interference: the supplementary that D2D UE uses timer and reference base station to send, time recording and one of structure cause the CeUE tabulation of harmful interference, whether can produce severe jamming to D2D UE in order to judge CeUE, and the PDCCH information and the resource allocation information that obtain described CeUE relevant according to this list-decoding; D2D UE recycles this information distribution Radio Resource, so that can avoid closing on the severe jamming that described CeUE produces;
(7) obtain Radio Resource by competitive way between a plurality of D2D UE and connect, then carry out transfer of data.
3. method according to claim 1, it is characterized in that: described method is applicable to following scene: the cellular transmission based on LTE-A adopts FDD or TDD mode, the D2D pattern communication adopts the TDD mode, and the uplink spectrum resource of the multiplexing CeUE of D2D UE.
4. method according to claim 1, it is characterized in that: described method is applicable to following scene: based on the hybrid network of OFDM OFDMA technology, perhaps CeUE does not use the scene of CA technology, and at this moment, CC is substituted by carrier wave or some setting Resource Block RBs.
5. method according to claim 2, it is characterized in that: the duration that described base station stored is set a plurality of subframes or frame is T
RecordThe uplink scheduling historical information, be used for to determine the interference that CeUE produces the D2D pattern communication; And by the base station with this duration T
RecordParameter is broadcast to the D2D UE in the whole residential quarter, so that D2D UE must be at T
RecordReport interfere information in time; Described duration T
RecordIn agreement, arrange, and can reconfigure or fix; Because of the characteristics of honeycomb mode communication uplink scheduling, CeUE can be scheduled for other CC because of the variation of channel status and load, therefore the duration T of this uplink scheduling historical information after setting the period
RecordCorresponding with the uplink scheduling cycle, to adapt to above-mentioned variation.
6. method according to claim 2 is characterized in that: described threshold value T
HarmIntBe to be determined according to the factor that comprises channel status, quality of service requirement and through-put power by D2D UE, the interference that is used for CeUE is caused is divided into following two classes: be higher than T
HarmIntHarmful interference and be lower than T
HarmIntHarmless interference.
7. method according to claim 2, it is characterized in that: in the described step (4), supplementary from the base station is D2D UE to be caused the tabulation of a plurality of CeUE information of harmful interference, described each the CeUE information of harmful interference that causes comprises at least: the index of the CC in uplink scheduling information and Radio Network Temporary Identifier RNTI value, and optional following content: sending mode/descending control information format, comprise Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (C-RNTI), the Radio Network Temporary Identifier type of semi-persistent scheduling Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (SPS-C-RNTI) and random access radio network temporary mark (RA-RNTI) and user's semi-static scheduling resources and cycle; Wherein,
CC index in the described uplink scheduling information is used for helping D2D UE to find out the resource location of each the CeUE uplink scheduling that causes harmful interference, to reduce the difficulty in computation that PDCCH is decoded;
The RNTI value of the described CeUE that causes harmful interference is so that D2D UE can adopt the mode identical with this CeUE PDCCH that decodes;
Operation when the described RNTI type that causes the CeUE of harmful interference helps D2D UE to carry out the uplink scheduling information decoding is simple and easy.
8. method according to claim 2, it is characterized in that: described step (5) comprises following content of operation:
(51) after D2D UE receives the supplementary of base station, before carrying out radio resource management operations, the transmitting-receiving two-end TxUE of D2D and RxUE cause first the RNTI information of the CeUE of harmful interference alternately, coordinate the resource that both distribute separately, so that the D2D pattern communication avoids interference better again;
(52) auxiliary by the base station, D2D UE decoding obtains to contain the PDCCH that D2D RxUE is caused the CeUE uplink scheduling information of interference, and obtains corresponding resource and distribute; Like this, D2D UE is just no longer multiplexing to cause the resource of the CeUE of harmful interference to it, and utilizes remaining, as not have harmful interference resource transmission data, to avoid the interference from the CeUE that closes on.
9. method according to claim 2, it is characterized in that: described step (6) comprises following content of operation:
(61) D2D UE uses the supplementary of timer and reference base station broadcasting, and the relevant information that causes the CeUE of harmful interference is stored in the cellular user terminal tabulation, and determines accordingly whether to remove from the cellular user terminal tabulation or keep CeUE; This cellular user terminal list content comprises: cellular user terminal sequence number, timer and disturbance records; Described timer numerical value depends on the integral multiple of the time of the one-shot measurement interference that actual needs determines, and the maximum of timer is T
RecordDescribed disturbance records represents whether CeUE causes harmful interference to the D2D pattern communication, if in the setting-up time section, CeUE has caused harmful interference to the D2D pattern communication, and then it is recorded as " 1 ", otherwise, be designated as " 0 ";
(62) when timer makes zero, D2D UE determines whether to continue to observe this CeUE according to disturbance records and decision rule in the CeUE tabulation, or from this tabulation with its deletion; Described decision rule is the decision threshold ε that arranges, and is used for each CeUE is judged whether its number of times that occurs disturbance records within each timer setting cycle time is not more than ε, if think that then this CeUE can not cause severe jamming and delete it D2D UE; Otherwise D2D UE just should avoid this CeUE to its severe jamming, and it is retained in this tabulation and continues observation.
10. method according to claim 2 is characterized in that: described severe jamming is to judge according to the resource assignment record situation in the cellular user terminal tabulation, represents that certain CeUE produces harmful interference for a long time to this D2D UE.
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