CN105517139A - Synchronization method and user equipment of D2D communication - Google Patents
Synchronization method and user equipment of D2D communication Download PDFInfo
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- CN105517139A CN105517139A CN201410500097.2A CN201410500097A CN105517139A CN 105517139 A CN105517139 A CN 105517139A CN 201410500097 A CN201410500097 A CN 201410500097A CN 105517139 A CN105517139 A CN 105517139A
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Abstract
The invention discloses a synchronization method and user equipment of D2D communication. The synchronization method comprises that D2D user equipment receives a D2D synchronization signal from other D2D user equipment, a D2D synchronization channel is demodulated, and synchronization information is obtained; and the D2D user equipment selects a synchronization source from the other D2D user equipment according to the synchronization information in the priority criterion, and is synchronized with the synchronization source regularly. According to the scheme of the invention, the D2D user equipment obtains the synchronization information according to the D2D synchronization signal sent by the other D2D user equipment, selects the D2D user equipment as the synchronization source to realize regular synchronization, and thus, realizes D2D communication beyond the coverage range of a base station. Further, processing for maximal forwarding hop of the D2D synchronization signals, reselection of the synchronization source and synchronizations source negotiation among the D2D user equipment are also disclosed, and thus, response to different conditions of the D2D communication beyond the coverage range of the base station is provided.
Description
Technical field
The present invention relates to the communications field, particularly relate to synchronous method and the subscriber equipment of the communication of a kind of device-to-device.
Background technology
Along with the variation of mobile communication business, such as the application such as social networks, E-Payment in a wireless communication system universal, makes the business closely between user transmit demand growing.Occurred the communication pattern of device-to-device (Device-to-Device, referred to as D2D), and D2D communication pattern is subject to extensive concern day by day thereupon.As shown in Figure 1, D2D communication refers to the forwarding of business datum without base station and core net, directly by source user equipment by air interface transmission to target UE, also can be referred to as adjacent service (ProximityService is called for short ProSe).For the user of short-range communication, D2D not only saves radio spectrum resources, and reduces the transfer of data pressure of core net.
In cellular communications, the prerequisite that base station and UE carry out data communication be realize both Timing Synchronization in time, the downlink synchronous signal that UE is sent by base stations detected, comprise master sync signal (PrimarySynchronousSignal, referred to as PSS) and auxiliary synchronous signals (SecondarySynchronousSignal, referred to as SSS), realize the descending Timing Synchronization with base station; The up Timing Synchronization with base station is realized by compensating timing advance (TimingAdvance, referred to as TA).
In D2D communication system, need to realize Timing Synchronization between the transmission UE of D2D signal and reception UE, just likely correctly receive and demodulate D2D signal.D2DUE in cellular network is covered, very naturally selecting for one is realize synchronization timing alignment by the timing of the down-going synchronous of beehive network system or upstream synchronous timing, but, D2DUE outside cellular network is covered, namely the UE of D2D communication is adopted, owing to the synchronizing signal that base station sends can not be detected, the mode of the UE in thus can not covering according to cellular network obtains Timing Synchronization.
Summary of the invention
The technical problem that the present invention solves is to provide synchronous method and the subscriber equipment of the communication of a kind of device-to-device, can realize the D2D communication outside base station range.
For solving the problems of the technologies described above, the invention provides the synchronous method of a kind of device-to-device communication, comprising:
Device-to-device D2D subscriber equipment receives the D2D synchronizing signal that other D2D subscriber equipmenies send, demodulation D2D synchronizing channel, obtains synchronizing information;
Described D2D subscriber equipment is according to priority criteria and in other D2D subscriber equipmenies described, select synchronisation source according to described synchronizing information, carries out Timing Synchronization with described synchronisation source.
Preferably, described synchronizing information comprises: it is one or more that synchronisation source type, synchronisation source ID and D2D synchronizing signal forward in jumping figure;
Described priority rule comprises: described in corresponding with described synchronizing information, other D2D subscriber equipmenies are selected as the precedence of synchronisation source.
Preferably, when the D2D synchronizing signal that described synchronisation source sends comprises D2D synchronizing signal forwarding jumping figure and for presetting maximum hop count:
The D2D synchronizing signal that described D2D subscriber equipment sends based on described synchronisation source carries out Timing Synchronization, does not send D2D synchronizing signal to other D2D subscriber equipmenies; Or
New D2D synchronous signal sequence selected by described D2D subscriber equipment, based on the local clock of described D2D subscriber equipment to other D2D subscriber equipment timed sending D2D synchronizing signal; Or
The D2D synchronizing signal that described D2D subscriber equipment sends based on described synchronisation source carries out Timing Synchronization, selects new D2D synchronous signal sequence, and the timing of the D2D synchronizing signal sent based on described synchronisation source sends D2D synchronizing signal to other D2D subscriber equipmenies.
Preferably, the described local clock based on described D2D subscriber equipment comprises to other D2D subscriber equipment timed sending D2D synchronizing signal:
The timing of Stochastic choice local clock is alignd the original position of D2D resource; Or
The timing of local clock the earliest selecting to receive after the D2D synchronizing signal that described synchronisation source sends is alignd the original position of D2D resource.
Preferably, if described D2D subscriber equipment sends D2D data, then:
Described D2D subscriber equipment sends D2D data again after transmission N D2D synchronizing signal, and N is preset value; Wherein, have other D2D data to send if current, then described D2D subscriber equipment sends N D2D synchronizing signal after sending other D2D data described or while transmission other D2D data described, and then sends described D2D data.
Preferably, also comprise:
After described D2D subscriber equipment is synchronized to described synchronisation source, if described D2D subscriber equipment receives the D2D synchronizing signal that other equipment outside described synchronisation source sends, then:
Described D2D subscriber equipment according to the priority of the more described synchronisation source of described priority criteria and other equipment described, if the priority of other equipment described meets reselection conditions, then using other equipment described as new synchronisation source; Otherwise, keep described synchronisation source.
Preferably, corresponding first retaining zone of described synchronisation source, corresponding second retaining zone of other equipment described,
When the priority of other equipment described is discontented with sufficient reselection conditions, described D2D subscriber equipment selects the timing of described synchronisation source as the timing sending D2D data, selects the D2D data that timing corresponding to other equipment described sends as the D2D subscriber equipment received in the second retaining zone described in timing receipt.
Preferably, when described D2D subscriber equipment is using other equipment described as new synchronisation source, described D2D subscriber equipment, before being switched to described new synchronisation source, sending the indication information switched, makes other D2D subscriber equipmenies according to described indication information re-synchronization to other D2D subscriber equipmenies.
Preferably, described indication information comprises the timing differentials of described new synchronisation source and described synchronisation source and/or whether is switched to the instruction of described new synchronisation source.
Preferably, the enabling fashion of the content of described indication information comprises: come into force, come into force or come into force after indication information comes into force time delay after current D2D data send, wherein said indication information come into force time delay be the K in the transmission cycle of described D2D synchronizing signal doubly, K is positive integer.
Preferably, other D2D subscriber equipmenies comprise according to described indication information re-synchronization:
Other D2D subscriber equipmenies described rescan D2D synchronizing signal to select new synchronisation source after described indication information comes into force, or are directly synchronized to described new synchronisation source according to the timing differentials of described new synchronisation source and described synchronisation source.
Preferably, when described D2D subscriber equipment sends D2D synchronizing signal as independent synchronization source, described D2D subscriber equipment is also consulted as other D2D subscriber equipmenies in independent synchronization source with other D2D synchronizing signals of transmission, determines the D2D subscriber equipment as independent synchronization source.
Preferably, described D2D subscriber equipment is consulted with other D2D subscriber equipmenies sending other D2D synchronizing signals, determines that the D2D subscriber equipment as independent synchronization source comprises:
Described D2D subscriber equipment obtains the average power of the customer equipment identification of other D2D subscriber equipmenies or the described D2D synchronizing signal of other D2D subscriber equipmenies described reception, and the average power of the D2D synchronizing signal sent with self customer equipment identification or other D2D subscriber equipmenies described in self receiving compares, and determines the D2D subscriber equipment as synchronisation source according to comparative result.
The present invention also provides a kind of subscriber equipment for device-to-device communication, and be applied in said method, described subscriber equipment comprises:
Receiving element, for receiving the D2D synchronizing signal that other D2D subscriber equipmenies send, demodulation D2D synchronizing channel, obtains synchronizing information;
Receiving element, for receiving the D2D synchronizing signal that other D2D subscriber equipmenies send, demodulation D2D synchronizing channel, obtains synchronizing information;
Lock unit, the priority criteria pre-set for basis also selects synchronisation source according to the described synchronizing information that described receiving element obtains in other D2D subscriber equipmenies described, carries out Timing Synchronization with described synchronisation source.
Preferably, described lock unit also for:
When the D2D synchronizing signal that described synchronisation source sends comprises D2D synchronizing signal forwarding jumping figure and is default maximum hop count:
The D2D synchronizing signal sent based on described synchronisation source carries out Timing Synchronization, does not send D2D synchronizing signal to other D2D subscriber equipmenies; Or
Select new D2D synchronous signal sequence, based on the local clock of described D2D subscriber equipment to other D2D subscriber equipment timed sending D2D synchronizing signal; Or
The D2D synchronizing signal sent based on described synchronisation source carries out Timing Synchronization, selects new D2D synchronous signal sequence, and the timing of the D2D synchronizing signal sent based on described synchronisation source sends D2D synchronizing signal to other D2D subscriber equipmenies.
Preferably, described lock unit also for:
After described D2D subscriber equipment is synchronized to described synchronisation source, if described D2D subscriber equipment receives the D2D synchronizing signal that other equipment outside described synchronisation source sends, then:
According to the priority of the more described synchronisation source of described priority criteria and other equipment described, if the priority of other equipment described meets reselection conditions, then using other equipment described as new synchronisation source; Otherwise, keep described synchronisation source.
Preferably, described lock unit also for:
When described D2D subscriber equipment is using other equipment described as new synchronisation source, before described D2D subscriber equipment is switched to described new synchronisation source, send the indication information switched to other D2D subscriber equipmenies, make other D2D subscriber equipmenies according to described indication information re-synchronization.
Preferably, described lock unit also for:
When described D2D subscriber equipment sends D2D synchronizing signal as independent synchronization source, make described D2D subscriber equipment and send also consulting as other D2D subscriber equipmenies in independent synchronization source of other D2D synchronizing signals, determining the D2D subscriber equipment as independent synchronization source.
Technique scheme of the present invention has following beneficial effect:
Adopt the scheme that the embodiment of the present invention provides, the D2D synchronous signal obtaining synchronizing information that D2D subscriber equipment sends according to other D2D subscriber equipmenies, select D2D subscriber equipment to realize Timing Synchronization as synchronisation source, thus achieve the D2D communication outside base station range.Further, in the embodiment of the present invention, also disclose and the process consulting synchronisation source between maximum, the gravity treatment synchronisation source of jumping figure and D2D subscriber equipment is forwarded to D2D synchronizing signal, thus give corresponding processing scheme for the various situations of the D2D communication outside base station range.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in specification, claims and accompanying drawing and obtain.
Accompanying drawing explanation
Accompanying drawing is used to provide the further understanding to technical solution of the present invention, and forms a part for specification, together with embodiments of the present invention for explaining technical scheme of the present invention, does not form the restriction to technical solution of the present invention.
Fig. 1 illustrates the schematic diagram of the D2D communication of prior art;
Fig. 2 illustrates the schematic diagram of the subframe in the LTE/LTE-A system of prior art;
Fig. 3 illustrates the network design schematic diagram of the cellular radio Communication system of prior art;
Fig. 4 illustrates the flow chart of the synchronous method of the device-to-device communication that the embodiment of the present invention provides;
Fig. 5 is the D2D synchronization scenarios schematic diagram of application example one;
Fig. 6 is the D2D synchronization scenarios schematic diagram of application example two;
Fig. 7 is the D2D synchronization scenarios schematic diagram of application example three;
Fig. 8 is the D2D synchronization scenarios schematic diagram of application example four;
Fig. 9 illustrates the structure chart of the subscriber equipment of the device-to-device communication that the embodiment of the present invention provides.
Embodiment
For making object of the invention process, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Described embodiment is the present invention's part embodiment, instead of whole embodiments.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Below in conjunction with accompanying drawing, embodiments of the invention are described in detail.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limiting the scope of the invention can not be interpreted as.
The techniques described herein are applicable to cellular radio Communication system or network.Common cellular radio Communication system can based on CDMA (CodeDivisionMultiplexingAccess, code division multiple access) technology, FDMA (FrequencyDivisionMultiplexingAccess, frequency division multiple access) technology, OFDMA (Orthogonal-FDMA, OFDM) technology, SC-FDMA (SingleCarrier-FDMA, single-carrier frequency division multiple access) technology etc.Such as, 3GPP (3rdGenerationPartnershipProject) LTE (LongTermEvolution, Long Term Evolution)/LTE-A (LTE-Advanced, senior Long Term Evolution) cellular communication system down link (or being called forward link) is based on OFDMA technology, and up link (or being called reverse link) is based on SC-FDMA multiple access technology.Following then likely support on a link mix multiple access technology.
In OFDMA/SC-FDMA system, when the Radio Resource (RadioResource) for communicating is-form of frequency bidimensional.Such as, for LTE/LTE-A system, the communication resource of uplink and downlink link is all for unit divides with radio frames (radioframe) on time orientation, each radio frames (radioframe) length is 10ms, comprise the subframe (sub-frame) that 10 length are 1ms, as shown in Figure 2, each subframe comprises two time slots (slot) that length is 0.5ms.And different according to the configuration of Cyclic Prefix (CyclicPrefix, CP), each time slot can comprise 6 or 7 OFDM or SC-FDM symbols.
In frequency direction, resource with subcarrier (subcarrier) for unit divide, specifically in the communications, the least unit that frequency domain resource is distributed is RB (ResourceBlock, Resource Block), a PRB (PhysicalRB, Physical Resource Block) of corresponding physical resource.A PRB comprises 12 subcarriers (sub-carrier) at frequency domain, corresponding to a time slot (slot) of time domain.On each OFDM/SC-FDM symbol, the resource of a corresponding subcarrier is called Resource Unit (ResourceElement, RE).
In LTE/LTE-A cellular communication, user equipment (UE) finds LTE network by detecting synchronizing signal (SynchronizationSignal, SS).Synchronizing signal includes master sync signal (PrimarySS, PSS) and auxiliary synchronous signals (SecondarySS, SSS).By detecting synchronizing signal, UE obtains and the downstream frequency of base station and time synchronized.Further, because synchronizing signal carries Physical Cell Identifier, detect synchronizing signal and also mean that UE finds LTE/LTE-A community.
In up link, when UE has transmitting uplink data, need to initiate Stochastic accessing (RandomAccess, RA) carry out uplink synchronous and set up RRC (RadioResourceControl, RRC) connect, namely enter RRC from RRC free time (Idle) state and connect (Connected) state.During Stochastic accessing, UE needs to send random access guiding (preamble), and network side, by detecting random access guiding in specific running time-frequency resource, realizes the identification of UE and the synchronous of up link.
Figure 3 shows that the network design schematic diagram of cellular radio Communication system.Can be 3GPPLTE/LTE-A system shown in figure, or other cellular radio Communication technology.In the Access Network of cellular radio Communication system, the network equipment generally comprises the base station (basestation of some, or be called Node B, NodeB, or the Node B of evolution, evolvedNodeB, eNB, or the Node B strengthened, enhancedNodeB, and other network entity (networkentity) or network element (networkelement) eNB).Or, in short, network side (E-UTRAN, EvolvedUniversalTerrestrialRadioAccessNetwork, the universal terrestrial access network of evolution) also can be referred to as in 3 gpp.Base station mentioned here also comprises the low power nodes (LowPowerNode, LPN) in network, such as Femto cell or Home eNodeB (pico, Relay, femto, HeNB and HomeeNB etc.).Simple for describing, merely illustrate 3 base stations in Fig. 3.Base station provides certain wireless signal coverage, and terminal in this coverage (terminal, or be called subscriber equipment, i.e. UserEquipment, is abbreviated as UE) radio communication can be carried out with this base station.The wireless signal overlay area of a base station may be divided into one or more community (cell) or sector (sector) based on some criterion, such as may Shi Sange community.
When D2D communicates, there is the time synchronized between transmitting terminal UE and receiving terminal UE, namely D2DUE gets the transmission timing of corresponding D2D signal and/or receives timing, to complete transmission and/or the reception of corresponding D2D signal.For the outer D2DUE of covering, do not have the synchronizing signal of base station for synchronously, D2DUE realizes the synchronous of D2D communication by the D2D synchronizing signal detecting D2DUE transmission.
The synchronous method that the embodiment of the present invention provides a kind of device-to-device to communicate, as shown in Figure 4, the method comprises:
Step 401, D2DUE receives the D2D synchronizing signal that other D2DUE send, demodulation D2D synchronizing channel, obtains synchronizing information;
Step 402, described D2DUE is according to the priority criteria pre-set and in other D2DUE described, select synchronisation source according to described synchronizing information, carries out Timing Synchronization with described synchronisation source.
Wherein, preferably, described synchronizing information can comprise: it is one or more that synchronisation source type, synchronisation source ID and D2D synchronizing signal forward in jumping figure.Described synchronisation source type comprises base station, independent synchronization source (I-SS) and relay synchronization source.Described independent synchronization source refers to that self sends the UE of D2D synchronizing signal and D2D synchronizing signal that non-forwarded receives, can have corresponding jumping figure 0 and jump.Described relay synchronization source refers to the UE forwarding the D2DSS received.The forwarding jumping figure of described synchronizing signal refers to the number of times that corresponding same D2DSS forwards, and it is 1 that first time forwards then corresponding jumping figure, the like.For D2D communication system, pre-configured D2DUE synchronizing signal the maximum of jumping figure, i.e. maximum hop count can be forwarded.
Described priority rule comprises: described in corresponding with described synchronizing information, other D2DUE are selected as the precedence of synchronisation source.Such as, priority order from high to low comprises: synchronisation source type, synchronizing signal forward jumping figure, synchronous signal receiver power average value.Wherein, synchronisation source type medium priority order is from high to low: base station, independent synchronization source, relay synchronization source.The height that the priority ratio jumping figure value that in synchronizing signal forwarding jumping figure, jumping figure value is little is large.Synchronous signal receiver is high-power higher than little priority.
Preferably, when the D2D synchronizing signal that described synchronisation source sends comprises D2D synchronizing signal forwarding jumping figure and for presetting maximum hop count:
The D2D synchronizing signal that described D2DUE sends based on described synchronisation source carries out Timing Synchronization, does not send D2D synchronizing signal to other D2DUE; Or
Described D2DUE selects new D2D synchronous signal sequence, based on the local clock of described D2DUE to other D2DUE timed sending D2D synchronizing signal; Or
The D2D synchronizing signal that described D2DUE sends based on described synchronisation source carries out Timing Synchronization, selects new D2D synchronous signal sequence, and the timing of the D2D synchronizing signal sent based on described synchronisation source sends D2D synchronizing signal to other D2DUE.
Preferably, the described local clock based on described D2DUE comprises to other D2DUE timed sending D2D synchronizing signal:
The timing of Stochastic choice local clock is alignd the original position of D2D resource; Or
The timing of local clock the earliest selecting to receive after the D2D synchronizing signal that described synchronisation source sends is alignd the original position of D2D resource.
Preferably, if described D2DUE sends D2D data, then:
Described D2DUE sends D2D data again after transmission N D2D synchronizing signal, and N is preset value; Wherein, have other D2D data to send if current, then described D2DUE sends N D2D synchronizing signal after sending other D2D data described or while transmission other D2D data described, and then sends described D2D data.
Preferably, the method also comprises:
After described D2DUE is synchronized to described synchronisation source, if described D2DUE receives the D2D synchronizing signal that other equipment outside described synchronisation source sends, then: described D2DUE is according to the priority of the more described synchronisation source of described priority criteria and other equipment described, if the priority of other equipment described meets reselection conditions, then using other equipment described as new synchronisation source; Otherwise, keep described synchronisation source.Described reselection conditions can comprise: in the decision window preset, the priority of the D2D synchronizing signal that other equipment sends is all the time higher than the D2D synchronizing signal that synchronisation source sends.After being switched to new synchronisation source, send D2D synchronizing signal based on described new synchronisation source.
Corresponding first retaining zone of wherein said synchronisation source, corresponding second retaining zone of other equipment described.This first retaining zone can be different from the second retaining zone.When the priority of described synchronisation source is discontented with sufficient reselection conditions, described D2DUE selects the timing of described synchronisation source as the timing sending D2D data, selects the D2D data that timing corresponding to other equipment described sends as the D2DUE received in the second retaining zone described in timing receipt.
Preferably, when described D2DUE is using other equipment described as new synchronisation source, described D2DUE, before being switched to described new synchronisation source, sending the indication information switched, makes other D2DUE according to described indication information re-synchronization to other D2DUE.
Preferably, described indication information comprises the timing differentials of described new synchronisation source and described synchronisation source and/or whether is switched to the instruction of described new synchronisation source.
Preferably, the enabling fashion of the content of described indication information comprises: come into force, come into force or come into force after indication information comes into force time delay after current D2D data send, wherein said indication information come into force time delay be the K in the transmission cycle of described D2D synchronizing signal doubly, K is positive integer.
Preferably, other D2DUE comprise according to described indication information re-synchronization:
Other D2DUE described rescan D2D synchronizing signal after described indication information comes into force, or are directly synchronized to described new synchronisation source according to the timing differentials of described new synchronisation source and described synchronisation source.
Wherein, preferably, described indication information carries in the current PD2DSCH of described D2DUE i.e. a PD2DSCH, and the content of indication information can comprise: whether described D2DUE have updated synchronisation source, the timing differentials of new synchronisation source and former synchronisation source.
Preferably, when described D2DUE receives the D2D synchronizing signal of other D2DUE transmission, when self also sends D2D synchronizing signal as independent synchronization source simultaneously, described D2DUE consults with other D2DUE sending other D2D synchronizing signals, determines the D2DUE as independent synchronization source.
Preferably, described D2DUE consults with other D2DUE sending other D2D synchronizing signals, determines that the D2DUE as independent synchronization source comprises:
Described D2D subscriber equipment obtains the average power of the customer equipment identification of other D2D subscriber equipmenies or the described D2D synchronizing signal of other D2D subscriber equipmenies described reception, and the average power of the D2D synchronizing signal sent with self customer equipment identification or other D2D subscriber equipmenies described in self receiving compares, determine that the D2D subscriber equipment as synchronisation source is preferred according to comparative result, the independent synchronization source that synchronisation source ID value is larger stops sending D2D synchronizing signal, exit independent synchronization source case, be synchronized to the other side's independent synchronization source; Independent synchronization source case is exited in the independent synchronization source that can certainly arrange synchronisation source ID value less, is synchronized to the other side's independent synchronization source.
Preferably, above-mentioned negotiation comprises: the synchronisation source ID that described new synchronisation source and former synchronisation source solve the other side's independent synchronization source from the PD2DSCH received holds consultation, and judges whether self exits synchronisation source role; Or described new synchronisation source and former synchronisation source are held consultation by interacting message information, judge whether self exits synchronisation source role.
Preferably, after described new synchronisation source and former synchronisation source complete described negotiation, before being switched to the other side's independent synchronization source, indicate other D2DUE by indication information.With described similar above, described indication information carries in described new synchronisation source and the current PD2DSCH of former synchronisation source, and its content can comprise: whether described D2DUE have updated the timing differentials in synchronisation source, described first independent synchronization source and the second independent synchronization source.The enabling fashion of the content of indication information is the same, can comprise: come into force, or comes into force after current D2D data send, or delays when indication information comes into force and come into force; Described indication information comes into force, and time delay is prewired is set to K times that D2D synchronizing signal sends the cycle, and K is positive integer.Correspondingly, other D2DUE is according to described indication information re-synchronization, comprise: if other D2DUE described resolves described current PD2DSCH obtain indication information, after described indication information comes into force, rescan D2D synchronizing signal, or be directly synchronized to described the other side's independent synchronization source according to the timing differentials of described new synchronisation source and former synchronisation source.
Below by four application examples more specifically scheme of providing of the bright embodiment of the present invention.
Application example one
The outer scene of D2D covering as shown in Figure 5, the 2nd of the corresponding I-SS0 of UE1, UE2 jumps and the 3rd jumping D2DSS forwards, and UE3 is merely able to the D2DSS detecting that UE2 sends, and does not receive the D2DSS of other synchronisation source or D2DUE transmission.Suppose that the pre-configured maximum hop count of D2D synchronizing signal is 3.
1) if UE3 does not have data to send, then UE3 and UE1, UE2 can have three kinds of modes to carry out selection/reselection to select synchronisation source.
The D2D data that mode 1:UE3 sends according to UE in the D2DSS timing receipt I-SS0 place retaining zone received, such as: the D2D data that UE2 sends.
Mode 2:UE3 selects new sequence based on autonomous timed sending D2DSS, the retaining zone that formation one is new like this, and the UE that UE3 is contiguous includes new retaining zone in.UE2, UE1 likely initiate to reselect synchronisation source flow process, the same with the gravity treatment synchronisation source scene of routine.
Wherein, when UE3 is based on the D2DSS that autonomous timed sending is new, local clock can be selected randomly to the original position of D2D resource of aliging.
The D2DSS that the timed sending of the D2DSS that mode 3:UE3 selects new sequence to send based on the UE2 that receives is new, but send the resource of D2DSS and the different of UE2.
Do the synchronisation source gravity treatment that may trigger UE1 and UE2 equally like this, but this stylish retaining zone is synchronous within the specific limits with the timing of old retaining zone, can reduce the interference between retaining zone.
Because now, the D2D resource aligning of UE3 and UE2, therefore UE3 is when selecting the resource sending D2DSS, can select to send resource with the D2DSS of UE2 stagger according to timing, receives with the reception of the D2DSS avoiding UE3 and UE2 the impact that half-duplex limits.
2) if UE3 has data to send, then UE3 and UE1, UE2 can have three kinds of modes to carry out selection/reselection to select synchronisation source.
Mode 1:UE3, based on the new D2DSS of autonomous timed sending, forms a new retaining zone.After transmission N (pre-configured) secondary D2DSS, send D2D data.
With above-mentioned 1) in mode 2 the same, this situation can form two overlapping nonsynchronous retaining zones of timing, may cause interference to the reception of data/signal.
The D2DSS that the timed sending of the D2DSS that mode 2:UE3 sends based on the UE2 that receives is new, forms a new retaining zone.Equally, after transmission N (pre-configured) secondary D2DSS, D2D data are sent.
Suppose that UE3 is merely able to the D2DSS detecting that UE2 sends herein, do not receive the D2DSS of other synchronisation source or forwarding UE transmission.The situation of the D2DSS that other UE sends can also be detected, see the explanation of application example two for UE3.
Application example two
The outer D2D scene of covering as shown in Figure 6, the retaining zone of I-SS0 and I-SS1 is contiguous, and adjacent UE such as UE2 and UE3 receives the D2DSS of the other side's transmission mutually.
UE3 receives the D2DSS from I-SS0 retaining zone, parse corresponding forwarding jumping figure, if reach maximum hop count, then UE3 does not carry out the operation of synchronisation source re-selection procedure, just timing corresponding for the D2DSS received is preserved, as the timing of the D2D data that D2DUE in the retaining zone of reception I-SS0 sends.Now, UE3 safeguards 2 timings, one from I-SS1 as this retaining zone sending/receiving timing, another from I-SS0 as adjacent sync region D2D data reception timing.Equally, UE2 also safeguards 2 timings.
If UE3 receives the D2DSS from I-SS0 retaining zone, the corresponding jumping figure that forwards does not reach maximum hop count, then UE3 is according to priority criteria, carries out the operation of synchronisation source re-selection procedure.First compare the synchronisation source type of the correspondence in current sync region and adjacent sync region, I-SS1 and I-SS0 is independent synchronization Source Type, then compare the forwarding jumping figure of the D2DSS receiving adjacent sync region and current sync region further.Such as, the forwarding jumping figure of current D2DSS is 1, and the forwarding jumping figure of the D2DSS of corresponding I-SS0 retaining zone is 2, and so according to priority criteria, UE3 does not upgrade synchronisation source, still keeps being synchronized to I-SS1.
And for UE2, the forwarding jumping figure receiving the D2DSS of I-SS0 retaining zone is 3, and the forwarding jumping figure receiving the D2DSS of I-SS1 retaining zone is also 2, then compare the received power mean value of D2DSS in comparison window further, wherein comparison window is a period of time.Suppose that the received power mean value of the D2DSS of I-SS1 retaining zone is greater than the received power mean value of the D2DSS of I-SS0 retaining zone, then according to priority criteria, UE2 carries out the operation of reselection procedure synchronisation source, upgrades synchronisation source to I-SS1.
Application example three
Scene as shown in Figure 7, if the UE1 in retaining zone detects new D2DSS, as from UE3, and judges that according to priority criteria the priority of the D2DSS that the priority ratio of the D2DSS made new advances is current is high, then triggering synchronous source update process.
Complete synchronisation source gravity treatment judgement at UE1, before being switched to new synchronisation source UE3, UE1 forwards in D2DSS/PD2DSCH at present increases indication information.For the situation new synchronisation source being detected, indicate new synchronisation source timing and the difference of current sync source timing with nbit, represent and will be updated to new timing.After the UE of down hop solves indication information, timing differentials corresponding according to nbit after m D2DSS sends all after dates or receive current data (receiving data), is switched to new timing, saves the scanning process reselecting synchronisation source.
Also have another kind of situation, after a certain forwarding UE loses current sync source, increase indication information in D2DSS/PD2DSCH, can indicate synchronisation source lastest imformation with 1bit, the UE of down hop, after solution to information, starts again to search for new synchronisation source.
Also instruction two kinds of situations can be unified by n+1bit.If highest order bit 0 represents that not making synchronisation source upgrades, if 1 represents and upgrades synchronisation source, if after nbit be F entirely, then expression needs again to search for synchronisation source, otherwise represents the timing differentials in new synchronisation source and current sync source.
Application example four
Cover outer scene as shown in Figure 8, when two independent synchronization source I-SS0 and I-SS1 near time, the role of one of them I-SS needs termination.In this example, need to judge that the role in which independent synchronization source stops according to certain criterion.
Comprise as under type based on the criterion judged:
1) judge based on synchronisation source ID, the termination I-SS role that ID value is little;
I-SS0 and I-SS1 solves the synchronisation source ID of the other side respectively, and compares with the synchronisation source ID of oneself, differentiate.This mode does not need interactive information, directly can solve and differentiate.The ID of two I-SS likely can be identical, and these standards lost efficacy in this case.In addition, the termination I-SS role that ID value is large can also be determined.
2) interactive information judges, according to mutual UE identification number (as IMSI), or received power judges.
Interactive information sends in D2D data, and UE mark is unique identification for UE, can guarantee the differentiation of I-SS priority.
After independent synchronization source I-SS0 or I-SS1 completes priority discrimination, before the role stopping independent synchronization source, based on current D2DSS timed sending indication information, be used to indicate other D2DUE and carry out synchronisation source selection/reselection and select.
Suppose that I-SS0 is according to priority discrimination, stop sending D2DSS, be resynchronized to I-SS1.Then before stopping sends D2DSS, send indication information, content comprises: whether I-SS0 upgrades synchronisation source, the timing differentials of new synchronisation source and I-SS1 and current sync source and I-SS0.If have other UE at current sync at I-SS0, so these UE carry out synchronisation source gravity treatment according to indication information.Carry out D2DSS scanning immediately after receiving indication information, or according to the timing differentials of I-SS1 and I-SS0, directly complete the Timing Synchronization to I-SS1.
Based on the technical conceive identical with said method embodiment, the embodiment of the present invention also provides a kind of subscriber equipment for device-to-device communication, and as shown in Figure 9, described subscriber equipment comprises:
Receiving element 10, for receiving the D2D synchronizing signal that other D2D subscriber equipmenies send, demodulation D2D synchronizing channel, obtains synchronizing information;
Lock unit 20, the priority criteria pre-set for basis also selects synchronisation source according to the described synchronizing information that described receiving element obtains in other D2D subscriber equipmenies described, carries out Timing Synchronization with described synchronisation source.
Preferably, described lock unit 20 also for:
When the D2D synchronizing signal that described synchronisation source sends comprises D2D synchronizing signal forwarding jumping figure and is default maximum hop count:
The D2D synchronizing signal sent based on described synchronisation source carries out Timing Synchronization, does not send D2D synchronizing signal to other D2D subscriber equipmenies; Or
Select new D2D synchronous signal sequence, based on the local clock of described D2D subscriber equipment to other D2D subscriber equipment timed sending D2D synchronizing signal; Or
The D2D synchronizing signal sent based on described synchronisation source carries out Timing Synchronization, selects new D2D synchronous signal sequence, and the timing of the D2D synchronizing signal sent based on described synchronisation source sends D2D synchronizing signal to other D2D subscriber equipmenies.
Preferably, described lock unit 20 also for:
After described D2D subscriber equipment is synchronized to described synchronisation source, if described D2D subscriber equipment receives the D2D synchronizing signal that other equipment outside described synchronisation source sends, then:
According to the priority of the more described synchronisation source of described priority criteria and other equipment described, if the priority of other equipment described meets reselection conditions, then using other equipment described as new synchronisation source; Otherwise, keep described synchronisation source.
Preferably, described lock unit 20 also for:
When described D2D subscriber equipment is using other equipment described as new synchronisation source, before described D2D subscriber equipment is switched to described new synchronisation source, send the indication information switched to other D2D subscriber equipmenies, make other D2D subscriber equipmenies according to described indication information re-synchronization.
Preferably, described lock unit 20 also for:
When described D2D subscriber equipment also sends D2D synchronizing signal as independent synchronization source, described D2D subscriber equipment is consulted with other D2D subscriber equipmenies sending other D2D synchronizing signals, determines the D2D subscriber equipment as independent synchronization source.
Adopt the scheme that the embodiment of the present invention provides, the D2D synchronous signal obtaining synchronizing information that D2D subscriber equipment sends according to other D2D subscriber equipmenies, select D2D subscriber equipment to realize Timing Synchronization as synchronisation source, thus achieve the D2D communication outside base station range.Further, in the embodiment of the present invention, also disclose and the process consulting synchronisation source between maximum, the gravity treatment synchronisation source of jumping figure and D2D subscriber equipment is forwarded to D2D synchronizing signal, thus give corresponding processing scheme for the various situations of the D2D communication outside base station range.
The terminal provided by adopting the embodiment of the present invention and method, recorded by the processor of terminal and the process of application-specific is operated, and operate according to the process of operation play instruction executive logging, thus terminal self can be utilized perform the operation of repeatability, user is not needed in person to operate, thus terminal can be made automatically to repeat certain certain operations, the outpost of the tax office game etc. of such as e-book page turning, webpage page turning, repeatability, and do not need user to do repetitive work.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of request of the present invention protection.
Claims (18)
1. a synchronous method for device-to-device communication, is characterized in that, comprising:
Device-to-device D2D subscriber equipment receives the D2D synchronizing signal that other D2D subscriber equipmenies send, demodulation D2D synchronizing channel, obtains synchronizing information;
Described D2D subscriber equipment is according to priority criteria and in other D2D subscriber equipmenies described, select synchronisation source according to described synchronizing information, carries out Timing Synchronization with described synchronisation source.
2. the method for claim 1, is characterized in that, described synchronizing information comprises: it is one or more that synchronisation source type, synchronisation source ID and D2D synchronizing signal forward in jumping figure;
Described priority rule comprises: described in corresponding with described synchronizing information, other D2D subscriber equipmenies are selected as the precedence of synchronisation source.
3. the method for claim 1, is characterized in that, when the D2D synchronizing signal that described synchronisation source sends comprises D2D synchronizing signal forwarding jumping figure and is default maximum hop count:
The D2D synchronizing signal that described D2D subscriber equipment sends based on described synchronisation source carries out Timing Synchronization, does not send D2D synchronizing signal to other D2D subscriber equipmenies; Or
New D2D synchronous signal sequence selected by described D2D subscriber equipment, based on the local clock of described D2D subscriber equipment to other D2D subscriber equipment timed sending D2D synchronizing signal; Or
The D2D synchronizing signal that described D2D subscriber equipment sends based on described synchronisation source carries out Timing Synchronization, selects new D2D synchronous signal sequence, and the timing of the D2D synchronizing signal sent based on described synchronisation source sends D2D synchronizing signal to other D2D subscriber equipmenies.
4. method as claimed in claim 3, it is characterized in that, the described local clock based on described D2D subscriber equipment comprises to other D2D subscriber equipment timed sending D2D synchronizing signal:
The timing of Stochastic choice local clock is alignd the original position of D2D resource; Or
The timing of local clock the earliest selecting to receive after the D2D synchronizing signal that described synchronisation source sends is alignd the original position of D2D resource.
5. method as claimed in claim 3, is characterized in that, if described D2D subscriber equipment sends D2D data, then:
Described D2D subscriber equipment sends D2D data again after transmission N D2D synchronizing signal, and N is preset value; Wherein, have other D2D data to send if current, then described D2D subscriber equipment sends N D2D synchronizing signal after sending other D2D data described or while transmission other D2D data described, and then sends described D2D data.
6. the method for claim 1, is characterized in that, also comprises:
After described D2D subscriber equipment is synchronized to described synchronisation source, if described D2D subscriber equipment receives the D2D synchronizing signal that other equipment outside described synchronisation source sends, then:
Described D2D subscriber equipment according to the priority of the more described synchronisation source of described priority criteria and other equipment described, if the priority of other equipment described meets reselection conditions, then using other equipment described as new synchronisation source; Otherwise, keep described synchronisation source.
7. method as claimed in claim 6, is characterized in that, corresponding first retaining zone of described synchronisation source, corresponding second retaining zone of other equipment described,
When the priority of other equipment described is discontented with sufficient reselection conditions, described D2D subscriber equipment selects the timing of described synchronisation source as the timing sending D2D data, selects the D2D data that timing corresponding to other equipment described sends as the D2D subscriber equipment received in the second retaining zone described in timing receipt.
8. method as claimed in claim 6, it is characterized in that, when described D2D subscriber equipment is using other equipment described as new synchronisation source, described D2D subscriber equipment is before being switched to described new synchronisation source, send the indication information switched to other D2D subscriber equipmenies, make other D2D subscriber equipmenies according to described indication information re-synchronization.
9. method as claimed in claim 8, it is characterized in that, described indication information comprises the timing differentials of described new synchronisation source and described synchronisation source and/or whether is switched to the instruction of described new synchronisation source.
10. method as claimed in claim 8, it is characterized in that, the enabling fashion of the content of described indication information comprises: come into force, come into force or come into force after indication information comes into force time delay after current D2D data send, wherein said indication information come into force time delay be the K in the transmission cycle of described D2D synchronizing signal doubly, K is positive integer.
11. methods as claimed in claim 8, it is characterized in that, other D2D subscriber equipmenies comprise according to described indication information re-synchronization:
Other D2D subscriber equipmenies described rescan D2D synchronizing signal to select new synchronisation source after described indication information comes into force, or are directly synchronized to described new synchronisation source according to the timing differentials of described new synchronisation source and described synchronisation source.
12. the method for claim 1, it is characterized in that, when described D2D subscriber equipment sends D2D synchronizing signal as independent synchronization source, described D2D subscriber equipment is also consulted as other D2D subscriber equipmenies in independent synchronization source with other D2D synchronizing signals of transmission, determines the D2D subscriber equipment as independent synchronization source.
13. methods as claimed in claim 12, is characterized in that, described D2D subscriber equipment is consulted with other D2D subscriber equipmenies sending other D2D synchronizing signals, determines that the D2D subscriber equipment as independent synchronization source comprises:
Described D2D subscriber equipment obtains the average power of the customer equipment identification of other D2D subscriber equipmenies or the described D2D synchronizing signal of other D2D subscriber equipmenies described reception, and the average power of the D2D synchronizing signal sent with self customer equipment identification or other D2D subscriber equipmenies described in self receiving compares, and determines the D2D subscriber equipment as synchronisation source according to comparative result.
14. 1 kinds, for the subscriber equipmenies of device-to-device communication, is characterized in that, in method described in any one being applied to claim 1-13, described subscriber equipment comprises:
Receiving element, for receiving the D2D synchronizing signal that other D2D subscriber equipmenies send, demodulation D2D synchronizing channel, obtains synchronizing information;
Lock unit, the priority criteria pre-set for basis also selects synchronisation source according to the described synchronizing information that described receiving element obtains in other D2D subscriber equipmenies described, carries out Timing Synchronization with described synchronisation source.
15. subscriber equipmenies as claimed in claim 14, is characterized in that, described lock unit also for:
When the D2D synchronizing signal that described synchronisation source sends comprises D2D synchronizing signal forwarding jumping figure and is default maximum hop count:
The D2D synchronizing signal sent based on described synchronisation source carries out Timing Synchronization, does not send D2D synchronizing signal to other D2D subscriber equipmenies; Or
Select new D2D synchronous signal sequence, based on the local clock of described D2D subscriber equipment to other D2D subscriber equipment timed sending D2D synchronizing signal; Or
The D2D synchronizing signal sent based on described synchronisation source carries out Timing Synchronization, selects new D2D synchronous signal sequence, and the timing of the D2D synchronizing signal sent based on described synchronisation source sends D2D synchronizing signal to other D2D subscriber equipmenies.
16. subscriber equipmenies as claimed in claim 14, is characterized in that, described lock unit also for:
After described D2D subscriber equipment is synchronized to described synchronisation source, if described D2D subscriber equipment receives the D2D synchronizing signal that other equipment outside described synchronisation source sends, then:
According to the priority of the more described synchronisation source of described priority criteria and other equipment described, if the priority of other equipment described meets reselection conditions, then using other equipment described as new synchronisation source; Otherwise, keep described synchronisation source.
17. subscriber equipmenies as claimed in claim 16, is characterized in that, described lock unit also for:
When described D2D subscriber equipment is using other equipment described as new synchronisation source, before described D2D subscriber equipment is switched to described new synchronisation source, send the indication information switched to other D2D subscriber equipmenies, make other D2D subscriber equipmenies according to described indication information re-synchronization.
18. subscriber equipmenies as claimed in claim 16, is characterized in that, described lock unit also for:
When described D2D subscriber equipment sends D2D synchronizing signal as independent synchronization source, make described D2D subscriber equipment and send also consulting as other D2D subscriber equipmenies in independent synchronization source of other D2D synchronizing signals, determining the D2D subscriber equipment as independent synchronization source.
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