CN104812089A - D2d communication method and ue - Google Patents

D2d communication method and ue Download PDF

Info

Publication number
CN104812089A
CN104812089A CN201410042165.5A CN201410042165A CN104812089A CN 104812089 A CN104812089 A CN 104812089A CN 201410042165 A CN201410042165 A CN 201410042165A CN 104812089 A CN104812089 A CN 104812089A
Authority
CN
China
Prior art keywords
community
signal
timing
resource allocation
base station
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201410042165.5A
Other languages
Chinese (zh)
Other versions
CN104812089B (en
Inventor
黄双红
吴栓栓
王文焕
杨瑾
袁明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZTE Corp
Original Assignee
ZTE Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Priority to CN201410042165.5A priority Critical patent/CN104812089B/en
Publication of CN104812089A publication Critical patent/CN104812089A/en
Application granted granted Critical
Publication of CN104812089B publication Critical patent/CN104812089B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a D2D communication method and UE. The method includes the following steps: D2D UE in a first cell determines reception timing of a D2D finding signal in a second cell and obtains resource distribution information corresponding to the D2D finding signal and then receives the D2D finding signal according to the reception timing and the resource distribution information. Through the D2D communication method and the UE, a problem, which exists in a related technology, that during D2D finding, timing synchronization of all pieces of UE in cells is hard to realize so that an effect of timing synchronization of the pieces of UE in the cells during D2D finding is achieved.

Description

The communication means of D2D and UE
Technical field
The present invention relates to the communications field, in particular to a kind of equipment to the communication means of equipment (Device to Device is called for short D2D) and subscriber equipment (User Equipment, referred to as UE).
Background technology
In a cellular communication system, when having business to transmit between two subscriber equipmenies, such as, subscriber equipment 1(UE1) to subscriber equipment 2(UE2) business datum, first by air interface transmission to the base station of community, UE1 place (Base Station, or be called Node B, or evolution (evolved) Node B), this base station by core net by this user data transmission to the base station of community, UE2 place, the base station of community, UE2 place again by above-mentioned business datum by air interface transmission to UE2.Fig. 1 is the cellular communication schematic diagram being positioned at the UE of same base station cell according to correlation technique, as shown in Figure 1, when UE1 and UE2 is positioned at same cellular cell, although two UE are by the MPS process of same base station, still need by core net transfer during transfer of data, and a data transfer still can consume two parts of radio spectrum resources.
As can be seen here, if UE1 and UE2 is positioned at same community and at a distance of comparatively near, so above-mentioned cellular communication method is not obviously optimum.Such as, and in fact, along with the variation of mobile communication business, the application such as social networks, E-Payment in a wireless communication system universal, makes the business closely between user transmit demand growing.Therefore, the communication pattern of D2D is subject to extensive concern day by day.Fig. 1 a is the D2D communication scheme being positioned at the UE of same base station cell according to correlation technique, D2D 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 adjacent service (Proximity Service is called for short ProSe) can be referred to as.As shown in Figure 1a, the business datum between two UE without base station and core net, but is directly transmitted between two UE.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, UE realizes the descending Timing Synchronization with base station by the downlink synchronous signal that base stations detected sends, by compensating timing advance (TimingAdvance, referred to as TA) realize the up Timing Synchronization with base station, wherein, synchronizing signal comprises master sync signal (PrimarySynchronous Signal, referred to as PSS) and auxiliary synchronous signals (Secondary Synchronous Signal, referred to as SSS).
Equally, in D2D communication system, D2D finds that signal sends UE and receives between UE also to be needed to realize Timing Synchronization, just likely correctly receives and demodulates D2D and finds signal.For the signal communication of the D2D UE in same community, very naturally, the compensation that the downlink synchronous signal that can send according to base station corresponding to affiliated subdistrict or carry out in conjunction with TA value is correlated with, obtains Timing Synchronization, to realize sending the Timing Synchronization between D2D UE and reception D2D UE.And the signal communication of D2D UE for minizone, different with regard to needs point situation.For synchronous on-premise network, the timing reference of different base station is stringent synchronization, D2D UE between neighbor cell, also can obtain Timing Synchronization according to the method that D2D UE in community is identical, complete between neighbor cell and communicate between different D2D UE.But for the network of asynchronous deployment, the timing reference of different base station is not close alignment, now, be subordinate to the D2D UE of neighbor cell under different base station, the downlink synchronous signal issued according to respective own base station or TA value can not realize Timing Synchronization.
Find that the subscriber equipment between small area is difficult to the problem realizing Timing Synchronization for D2D in correlation technique, not yet propose effective solution at present.
Summary of the invention
The invention provides communication means and the UE of a kind of D2D, find that between small area, subscriber equipment is difficult to realize the problem of Timing Synchronization at least to solve D2D in correlation technique.
According to an aspect of the present invention, provide a kind of D2D communication means, comprising: the D2D user equipment (UE) in the first community determines to find the D2D of the second community the reception timing of signal, and obtain resource allocation information corresponding to described D2D discovery signal; Described D2D UE receives described D2D according to described reception timing and described resource allocation information and finds signal.
Preferably, described D2D UE determines to find that the reception timing of signal comprises to the described D2D of described second community: described D2D UE detects the downlink synchronous signal of described second community; According to detected described downlink synchronous signal, described D2D UE determines that described D2D finds the transmission timing of signal, and described transmission timing is defined as described reception timing.
Preferably, described D2D UE determines to find that the reception timing of signal comprises to the described D2D of described second community: described D2D UE detects the downlink synchronous signal of described second community that at least one UE in described second community forwards, wherein, at least one UE described determines according to the Reference Signal Received Power RSRP of the UE in described second community or timing advance TA; According to detected described downlink synchronous signal, described D2D UE determines that described D2D finds the transmission timing of signal, and described transmission timing is defined as described reception timing.
Preferably, at least one UE described is comprising of determining according to RSRP or TA of the UE in described second community: at least one UE described is after the difference determined between the described first community RSRP that UE in described second community is corresponding and described second community RSRP of described second community own base station, the maximum M of a described difference UE is selected to obtain, wherein, described M is positive integer; Or at least one UE described is that after described second community own base station obtains UE in described second community TA value separately, select the maximum N number of UE of described TA value to obtain, wherein, described N is positive integer.
Preferably, described D2D UE determines to find that the reception timing of signal comprises to the described D2D of described second community: described D2D UE detects the downlink synchronous signal of described second community that other UE forward in described first community, wherein, other UE described are the UE of the downlink synchronous signal that described second community can be detected in described first community; According to detected described downlink synchronous signal, described D2D UE determines that described D2D finds the transmission timing of signal, and described transmission timing is defined as described reception timing.
Preferably, described D2D UE determines to find that Signal reception timing comprises to the described D2D of described second community: described D2DUE receives the Indication message of described D2D UE own base station, and wherein, described Indication message carries the timing information of described second community; Described D2D UE determines described reception timing according to described timing information.
Preferably, described timing information is obtained by following mode one of at least: obtained from described second community own base station alternately by the X2 interface between described first community own base station and described second community own base station; Obtained from described second community own base station by the radio open between described first community own base station and described second community own base station or non-standard interface; Obtain by the reporting information that the UE of the downlink synchronous signal of described second community can be detected in described first community.
Preferably, the timing information of described second community comprises: the standard deviation amount of described second community that the timing offset of described first community reported according at least one UE in described first community is determined, wherein, described timing offset obtains according to the downlink synchronous signal of described first community and the downlink synchronous signal of described second community.
Preferably, obtain described D2D and find that the described resource allocation information that signal is corresponding comprises: described D2D UE detects the broadcast message of described second community; Described D2D UE obtains described resource allocation information from described broadcast message.
Preferably, obtain described D2D and find that the described resource allocation information that signal is corresponding comprises: described D2D UE detects the downlink synchronous signal of described second community that at least one UE in described second community forwards, wherein, at least one UE described determines according to RSRP or TA of the UE in described second community; Described D2D UE forwarding the diverse location mapped respectively in subframe, obtains described resource allocation information according to the master sync signal PSS of detected described downlink synchronous signal and auxiliary synchronous signals SSS.
Preferably, obtain described D2D and find that the described resource allocation information that signal is corresponding comprises: described D2D UE detects the downlink synchronous signal of described second community that other UE forward in described first community, wherein, other UE described are the UE of the described downlink synchronous signal that described second community can be detected in described first community; Described D2D UE forwarding the diverse location mapped respectively in subframe, obtains described resource allocation information according to the master sync signal PSS of detected described downlink synchronous signal and auxiliary synchronous signals SSS.
Preferably, obtain described D2D and find that the described resource allocation information that signal is corresponding comprises: described D2D UE receives the Indication message of described D2D UE own base station, and wherein, described Indication message carries described resource allocation information; Described D2D UE obtains described resource allocation information from described Indication message.
Preferably, the described resource allocation information carried in described Indication message is got by following mode one of at least: obtained from described second community own base station alternately by the X2 interface between described first community own base station and described second community own base station; Obtained from described second community own base station alternately by the radio open between described first community own base station and described second community own base station or non-standard interface; Obtain by the reporting information that the UE of the described resource allocation information of described second community can be detected in described first community; Obtained from described second community own base station alternately by upper layer network, wherein, described upper layer network is the Web communication layer higher than described base station layer.
Preferably, obtain described D2D and find that the described resource allocation information that signal is corresponding comprises: the described resource allocation information that the UE receiving described second community directly forwards.
According to a further aspect in the invention, provide a kind of UE, comprising: determination module, for determining the reception timing D2D of the second community being found to signal; Acquisition module, finds for obtaining described D2D the resource allocation information that signal is corresponding; Receiver module, finds signal for receiving described D2D according to described reception timing and described resource allocation information.
Preferably, described determination module comprises: detecting unit, for detecting the downlink synchronous signal of described second community; Determining unit, for determining that according to detected described downlink synchronous signal described D2D finds the transmission timing of signal, and is defined as described reception timing by described transmission timing.
Preferably, described determination module comprises: detecting unit, for the downlink synchronous signal of described second community that at least one UE detected in described second community forwards, wherein, at least one UE described determines according to the Reference Signal Received Power RSRP of the UE in described second community or timing advance TA; Determining unit, for determining that according to detected described downlink synchronous signal described D2D finds the transmission timing of signal, and is defined as described reception timing by described transmission timing.
Preferably, described determination module comprises: detecting unit, for detecting the downlink synchronous signal of described second community that other UE forward in described first community, wherein, other UE described are the UE of the downlink synchronous signal that described second community can be detected in described first community; Determining unit, for determining that according to detected described downlink synchronous signal described D2D finds the transmission timing of signal, and is defined as described reception timing by described transmission timing.
Preferably, described determination module comprises: detecting unit, and for receiving the Indication message of described D2D UE own base station, wherein, described Indication message carries the timing information of described second community; Determining unit, for determining described reception timing according to described timing information.
Preferably, described acquisition module comprises: resources measurement unit, for detecting the broadcast message of described second community; Acquiring unit, for obtaining described resource allocation information from described broadcast message.
Preferably, described acquisition module comprises: resources measurement unit, for the downlink synchronous signal of described second community that at least one UE detected in described second community forwards, wherein, at least one UE described determines according to RSRP or TA of the UE in described second community; Acquiring unit, for the diverse location mapped respectively in forwarding subframe according to master sync signal PSS and the auxiliary synchronous signals SSS of detected described downlink synchronous signal, obtains described resource allocation information.
Preferably, described acquisition module comprises: resources measurement unit, for detecting the downlink synchronous signal of described second community that other UE forward in described first community, wherein, other UE described are the UE of the described downlink synchronous signal that described second community can be detected in described first community; Acquiring unit, for the diverse location mapped respectively in forwarding subframe according to master sync signal PSS and the auxiliary synchronous signals SSS of detected described downlink synchronous signal, obtains described resource allocation information.
Preferably, described acquisition module comprises: resources measurement unit, and for receiving the Indication message of described D2D UE own base station, wherein, described Indication message carries described resource allocation information; Acquiring unit, for obtaining described resource allocation information from described Indication message.
Preferably, described acquisition module comprises: acquiring unit, the described resource allocation information that the UE for receiving described second community directly forwards.
Pass through the present invention, the D2D UE in the first community is adopted to determine to find the D2D of the second community the reception timing of signal, and obtain resource allocation information corresponding to D2D discovery signal, then receive D2D according to reception timing and resource allocation information and find signal, solve D2D in correlation technique and find that the subscriber equipment between small area is difficult to the problem of Timing Synchronization, and then achieve the subscriber equipment Timing Synchronization between D2D discovery small area.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the cellular communication schematic diagram being positioned at the UE of same base station cell according to correlation technique;
Fig. 1 a is the D2D communication scheme being positioned at the UE of same base station cell according to correlation technique;
Fig. 2 is the flow chart of the D2D communication means according to the embodiment of the present invention;
Fig. 3 is the structured flowchart of the UE according to the embodiment of the present invention;
Fig. 3 a is the another kind of structured flowchart of the UE according to the embodiment of the present invention;
Fig. 3 b is another structured flowchart of the UE according to the embodiment of the present invention;
Fig. 4 is the schematic diagram of the Radio Resource structure according to correlation technique;
Fig. 4 a is the network design schematic diagram of the cellular radio Communication system according to correlation technique;
Fig. 5 be according to the preferred embodiment of the invention D2D find signal communication the first realize the schematic diagram of principle;
Fig. 6 is that D2D finds that the second of signal communication realizes the schematic diagram of principle according to the preferred embodiment of the invention;
Fig. 7 is the forwarding resource location exemplary plot of the pass-through mode one according to the embodiment of the present invention;
Fig. 8 is the Mapping Examples forwarding synchronizing signal according to a UE of the corresponding pass-through mode one of the embodiment of the present invention;
Fig. 9 is an example of the resource location of the forwarding synchronizing signal of corresponding pass-through mode two according to the embodiment of the present invention;
Figure 10 is the Mapping Examples forwarding synchronizing signal according to a UE of the corresponded manner two of the embodiment of the present invention;
Figure 11 be according to the preferred embodiment of the invention D2D find signal communication the third realize the schematic diagram of principle;
Figure 12 is that D2D finds the 4th kind of the signal communication schematic diagram realizing principle according to the preferred embodiment of the invention; And
Figure 13 is the D2D signal communication structure schematic diagram according to the embodiment of the present invention.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Provide a kind of D2D communication means in the present embodiment, Fig. 2 is the flow chart of the D2D communication means according to the embodiment of the present invention, and as shown in Figure 2, this flow process comprises the steps:
Step S202, the D2D UE in the first community determine the reception timing D2D of the second community being found to signal, and obtain resource allocation information corresponding to D2D discovery signal;
Step S204, D2D UE receives D2D according to reception timing and resource allocation information and finds signal.
By above-mentioned steps, solve the D2D subscriber equipment communicated between small area in correlation technique and be difficult to realize the problem of Timing Synchronization, and then reach the effect of the subscriber equipment Timing Synchronization between D2D communication small area.
Determine that the method receiving timing has a variety of, preferably, can be realized by following several mode:
Mode one, D2D UE detect the downlink synchronous signal of the second community, and determine that D2D finds the transmission timing of signal according to detected downlink synchronous signal, and transmission timing are defined as receiving timing.
Mode two, D2D UE detect the downlink synchronous signal of the second community that at least one UE in the second community forwards, and wherein, at least one UE determines according to RSRP or TA of the UE in the second community; According to detected downlink synchronous signal, D2D UE determines that D2D finds the transmission timing of signal, and this transmission timing be defined as receiving timing.
Preferably, after determining the difference between each self-corresponding adjacent area RSRP and Serving cell RSRP of UE that the mode of at least one UE can have following two kinds: second community own base station to determine in the second community, M the UE selecting described difference maximum is as at least one UE, and wherein, M is positive integer; Or after the second community own base station obtains UE in the second community TA value separately, the N number of UE selecting TA value maximum is as at least one UE, and wherein, N is positive integer.
Certainly, in other examples, can also determine that the RSRP of the Serving cell that the base station of at least one the UE: the second community reports according to UE and adjacent area safeguards a threshold value in the following way, and this threshold value is indicated to all UE in the second community by signaling, all UE in second community adjudicate according to the difference D of the Serving cell measured and adjacent cell RSRP, when D value is less than above-mentioned thresholding, UE just determines from as a member at least one UE, to forward the downlink synchronous signal of the second community further.
Mode three, D2D UE detect the downlink synchronous signal of the second community that other UE forward in the first community, and wherein, other UE are the UE of the downlink synchronous signal that the second community can be detected in the first community; According to detected downlink synchronous signal, D2D UE determines that D2D finds the transmission timing of signal, and transmission timing be defined as receiving timing.
Mode four, D2D UE receive the Indication message of D2D UE own base station, and wherein, this Indication message carries the timing information of the second community; D2D UE determines to receive timing according to timing information.Preferably, timing information can be obtained by following mode one of at least: obtained from the second community own base station alternately by the X2 interface between the first community own base station and the second community own base station; Obtained from the second community own base station by the radio open between the first community own base station and the second community own base station or non-standard interface; Obtain by the reporting information that the UE of the downlink synchronous signal of the second community can be detected in the first community.Wherein, the timing information of the second community can be the standard deviation amount of the second community that the timing offset of the first community reported according at least one UE in the first community is determined, this timing offset obtains according to the downlink synchronous signal of the first community and the downlink synchronous signal of described second community.
By above-mentioned several mode, the reception timing of the second community can be determined rapidly, thus realize the Timing Synchronization that D2D finds subscriber equipment between small area further.
The method of Gains resources assignment information also has a variety of, preferably, can be realized by following several mode:
Mode one, D2D UE detect the broadcast message of the second community, and from broadcast message Gains resources assignment information.
Mode two, D2D UE detect the downlink synchronous signal of the second community that at least one UE in the second community forwards, and wherein, at least one UE determines according to RSRP or TA of the UE in the second community; D2D UE is forwarding the diverse location mapped respectively in subframe, Gains resources assignment information according to PSS and SSS of detected downlink synchronous signal.
Mode three, D2D UE detect the downlink synchronous signal of the second community that other UE forward in the first community, and wherein, other UE are the UE of the downlink synchronous signal that the second community can be detected in the first community; D2D UE is forwarding the diverse location mapped respectively in subframe, Gains resources assignment information according to PSS and SSS of detected downlink synchronous signal.
Mode four, D2D UE receive the Indication message of D2D UE own base station, and wherein, Indication message carries resource allocation information; D2D UE is Gains resources assignment information from Indication message.Preferably, the resource allocation information carried in Indication message can be got by following mode one of at least: obtained by the X2 interface mutual Cong Suo bis-community own base station between the first community own base station and the second community own base station; Obtained from the second community own base station alternately by the radio open between the first community own base station and the second community own base station or non-standard interface; Obtain by the reporting information that the UE of the resource allocation information of the second community can be detected in the first community; Obtained from the second community own base station alternately by upper layer network, wherein, upper layer network is the Web communication layer higher than base station layer.
The resource allocation information that mode five, the UE receiving the second community directly forward.
By above-mentioned several mode, D2D can be obtained rapidly and find the resource allocation information that signal is corresponding, thus realize the Timing Synchronization of subscriber equipment in D2D discovery.
Additionally provide a kind of UE in the present embodiment, this UE is used for realizing above-described embodiment and preferred implementation, has carried out repeating no more of explanation.As used below, term " module " can realize the software of predetermined function and/or the combination of hardware.Although the device described by following examples preferably realizes with software, hardware, or the realization of the combination of software and hardware also may and conceived.
Fig. 3 is the structured flowchart of the UE according to the embodiment of the present invention, and as shown in Figure 3, this UE comprises: determination module 32, for determining the reception timing D2D of the second community being found to signal; Acquisition module 34, finds for obtaining D2D the resource allocation information that signal is corresponding; Receiver module 36, finds signal for receiving D2D according to reception timing and resource allocation information.
Fig. 3 a is the another kind of structured flowchart of the UE according to the embodiment of the present invention, and as shown in Figure 3 a, this device is except comprising all modules shown in Fig. 3, and wherein, determination module 32 comprises detecting unit 322 and determining unit 324.
Preferably, detecting unit 322, for detecting the downlink synchronous signal of the second community; Determining unit 324, for determining that according to detected downlink synchronous signal D2D finds the transmission timing of signal, and is defined as receiving timing by transmission timing.
Preferably, detecting unit 322, the downlink synchronous signal of the second community that at least one UE for detecting in the second community forwards, wherein, at least one UE determines according to RSRP or TA of the UE in the second community; Determining unit 324, for determining that according to detected downlink synchronous signal D2D finds the transmission timing of signal, and is defined as receiving timing by transmission timing.
Preferably, detecting unit 322, for detecting the downlink synchronous signal of the second community that other UE forward in the first community, wherein, other UE are the UE of the downlink synchronous signal that the second community can be detected in the first community; Determining unit 324, for determining that according to detected downlink synchronous signal D2D finds the transmission timing of signal, and is defined as receiving timing by transmission timing.
Preferably, detecting unit 322, for receiving the Indication message of D2D UE own base station, wherein, Indication message carries the timing information of the second community; Determining unit 324, receives timing for determining according to timing information.
Fig. 3 b is another structured flowchart of the UE according to the embodiment of the present invention, and as shown in Figure 3 b, this device is except comprising all modules shown in Fig. 3, and wherein, acquisition module 34 comprises resources measurement unit 342 and acquiring unit 344.
Preferably, resources measurement unit 342, for detecting the broadcast message of the second community; Acquiring unit 344, for Gains resources assignment information from broadcast message.
Preferably, resources measurement unit 342, the downlink synchronous signal of the second community that at least one UE for detecting in the second community forwards, wherein, at least one UE determines according to RSRP or TA of the UE in the second community; Acquiring unit 344, is forwarding the diverse location mapped respectively in subframe, Gains resources assignment information for PSS and SSS according to detected downlink synchronous signal.
Preferably, resources measurement unit 342, for detecting the downlink synchronous signal of the second community that other UE forward in the first community, wherein, other UE described are the UE of the downlink synchronous signal that the second community can be detected in the first community; Acquiring unit 344, is forwarding the diverse location mapped respectively in subframe, Gains resources assignment information for PSS and SSS according to detected downlink synchronous signal.
Preferably, resources measurement unit 342, for receiving the Indication message of D2D UE own base station, wherein, Indication message carries resource allocation information; Acquiring unit 344, for Gains resources assignment information from Indication message.
Preferably, acquisition module 34 can also only comprise: acquiring unit 344, the resource allocation information that the UE for receiving the second community directly forwards.
Be described below in conjunction with preferred embodiment, following preferred embodiment combines above-described embodiment and preferred implementation thereof.
The embodiment of the present invention is applicable to cellular radio Communication system or network.Common cellular radio Communication system can based on code division multiple access (Code Division Multiplexing Access, referred to as CDMA) technology, frequency division multiple access (Frequency DivisionMultiplexing Access, referred to as FDMA) technology, OFDM (Orthogonal-FDMA, referred to as OFDMA) technology, single-carrier frequency division multiple access (Single Carrier-FDMA, referred to as SC-FDMA) technology etc.Such as, third generation partner program (3rd Generation Partnership Project, referred to as 3GPP) Long Term Evolution (Long Term Evolution, referred to as LTE)/senior Long Term Evolution (LTE-Advanced, referred to as LTE-A) 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 (Radio Resource) 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 (radio frame) on time orientation, each radio frames length is 10ms, comprise the subframe (sub-frame) that 10 length are 1ms, each subframe comprises two time slots (slot) that length is 0.5ms, as shown in Figure 4.And different according to the configuration of Cyclic Prefix (Cyclic Prefix, 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 Resource Block (Resource Block, referred to as RB), a PRB(Physical RB of corresponding physical resource, Physical Resource Block).A PRB comprises 12 subcarriers at frequency domain, corresponding to a time slot of time domain.On each OFDM/SC-FDM symbol, the resource of a corresponding subcarrier is called Resource Unit (Resource Element is called for short RE), as shown in Figure 4.
In LTE/LTE-A cellular communication, user equipment (UE) finds LTE network by detecting synchronizing signal (Synchronization Signal, referred to as SS).Synchronizing signal includes master sync signal and auxiliary synchronous signals.By detecting synchronizing signal, the downstream frequency of UE and 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 (Random Access, referred to as RA) carry out uplink synchronous and set up RRC(Radio Resource Control, referred to as 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.
Fig. 4 a is the network design schematic diagram of the cellular radio Communication system according to correlation technique, can be 3GPPLTE/LTE-A system shown in Fig. 4 a, or other cellular radio Communication technology.In the Access Network of cellular radio Communication system, the network equipment generally comprises base station (the base station of some, or be called Node B, Node B, or the Node B of evolution, evolvedNode B, eNB, or the Node B strengthened, enhanced Node B, and other network entity (networkentity) or network element (network element) eNB).Or, in short, also can be referred to as network side in 3 gpp, i.e. the universal terrestrial access network (Evolved Universal Terrestrial Radio Access Network, referred to as E-UTRAN) of evolution.Base station mentioned here also comprises the low power nodes (Low Power Node, referred to as LPN) in network, such as Femto cell or Home eNodeB (pico, Relay, femto, HeNB and Home eNB etc.).Simple for describing, merely illustrate three base stations in Fig. 4 a.Base station provides certain wireless signal coverage, and terminal in this coverage (terminal, or be called UE, or be called device) 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 finds, also there is the time synchronized between similar transmitting terminal UE and receiving terminal UE, namely receiving terminal gets the transmission timing that corresponding D2D finds signal, to determine that corresponding D2D finds the reception timing of signal.If the D2D UE of minizone communicates, it is that D2D finds the resource information that signal distributes that receiving terminal UE also needs to obtain adjacent area.On this basis, receiving terminal UE correctly could receive D2D and find signal, and solves the content that corresponding D2D finds signal.
In nonsynchronous network is disposed, there is timing offset between different base station, carry out equipment when communicating to device data between the UE of the neighbor cell of affiliated different base station, the D2D that UE can be caused cannot correctly to receive from adjacent area due to timing error finds signal.If UE needs the D2D of the correct adjacent area UE of reception to find signal, first must know that the D2D that adjacent area UE sends finds the reception timing of signal and the resource allocation information of adjacent area UE.
Embodiment one
In the present embodiment, D2D UE direct-detection neighbor synchronization signal also obtains adjacent area D2D resource allocation information and resource allocation information corresponding to D2D signal.
Fig. 5 be according to the preferred embodiment of the invention D2D find signal communication the first realize the schematic diagram of principle, as shown in Figure 5, Cell51, Cell52 and Cell53 is the cellular cell of corresponding different base station respectively, UE54, UE55 and UE56 is the UE being subordinate to above-mentioned three communities respectively, signal 57, signal 58 and signal 59 are respectively the downlink synchronous signal of three communities, signal 510, signal 511 is respectively the downlink synchronous signal of corresponding Cell52 and Cell53 that UE54 can detect, signal 512 and signal 513 are that the D2D that the corresponding UE 55 that receives of UE54 and UE56 send finds signal respectively.Wherein, Cell51 is equivalent to the first community, Cell53 or Cell52 is equivalent to the second community, and the UE54 in Cell51 is equivalent to D2D UE, UE55 or UE56 is equivalent to the UE in the second community.
If network is synchronous deployment, the timing alignment between the base station that three communities are corresponding, the timing reference of the downlink synchronous signal of three communities is synchronous.After such three UE and UE54, UE55 and UE56 determine to send timing by the downlink synchronous signal of respective Serving cell, the reception timing carrying out D2D discovery between three UE is naturally synchronous, therefore, the descending timing got from serving BS is directly defined as the reception timing D2D of Cell52 and Cell53 being found to signal by UE54, thus receives the D2D discovery signal that adjacent area UE sends as UE55 and UE56.Further, the D2D Resourse Distribute of three communities is consistent, and UE54 is according to this community D2D resource allocation information, and the D2D receiving UE55 and UE56 at the resource location of correspondence finds signal, and solves D2D discovery signal content.
If network is asynchronous deployment, the timing between the base station that three communities are corresponding does not line up, and the timing reference of the downlink synchronous signal of three communities exists deviation.UE54 will receive the D2D discovery signal that UE55 and UE56 sends, and first must determine corresponding reception timing.In the present embodiment, suppose that UE54 can directly detect the downlink synchronous signal of Cell52 and Cell53, in this case, can be determined by the mode detecting adjacent area downlink synchronous signal to receive timing.Specifically, UE54 finds the transmission timing of signal according to the D2D that the downlink synchronous signal of Cell52 is determined in Cell52, and the D2D of Cell52 is found the transmission timing of signal is as the reception timing D2D of Cell52 being found to signal, find signal with the D2D that the UE such as UE55 received in Cell52 sends.Determine that according to the downlink synchronous signal in Cell53 the reception timing of the D2D discovery signal of the UE transmission in Cell53 is similar with said process, repeat no more herein.
When network is asynchronous deployment, after determining the reception timing of D2D discovery signal of adjacent area, the resource allocation information obtaining adjacent area is also needed to find signal with the D2D receiving adjacent area.Determine that reception timing and Gains resources assignment information do not have dividing of sequencing, in other embodiments, also first can obtain the resource allocation information of adjacent area, then determine to receive timing.The mode of Gains resources assignment information has a variety of, in the present embodiment, finds that the mode of the resource allocation information that signal is corresponding obtains by increasing instruction this community D2D in the broadcast message of base station.Specifically, all carry instruction this community D2D in the broadcast message that the base station corresponding to Cell51, Cell52, Cell53 sends and find the resource allocation information that signal is corresponding.UE54, except the broadcast message of this community Cell51 being detected, can also detect the broadcast message of adjacent area Cell52 and Cell53, and the D2D that can obtain adjacent area further from the broadcast message of adjacent area finds the resource allocation information that signal is corresponding.
The D2D that the resource allocation information that UE54 is regularly corresponding with the D2D discovery signal of the different adjacent areas obtained according to the reception of the different adjacent area of the correspondence determined receives different adjacent area finds signal, and parses D2D discovery signal content.
Embodiment two
In the present embodiment, by the downlink synchronous signal that adjacent area UE forwards, D2D UE determines that the D2D of adjacent area finds the reception timing of signal.
Fig. 6 is that D2D finds that the second of signal communication realizes the schematic diagram of principle according to the preferred embodiment of the invention, as shown in Figure 6, UE64 can not detect the downlink synchronous signal of adjacent area, and the D2D of adjacent area finds the reception timing of signal to need the downlink synchronous signal forwarded according to adjacent area UE to determine.In figure 6, Cell61, Cell62 and Cell63 are the cellular cell of corresponding different base station respectively, UE64, UE65 and UE66 are the terminal being subordinate to above-mentioned three communities respectively, signal 67, signal 68 and signal 69 are respectively the downlink synchronous signal of three communities, signal 610, signal 611 are respectively the downlink synchronous signal that in Cell62 and Cell63, UE65 and UE66 forwards, and signal 612 and 613 is that the D2D of UE65 and the UE66 transmission that UE64 receives finds signal respectively.
Reference Signal Received Power (the Reference Signal ReceivingPower of the Serving cell that each base station reports according to UE and adjacent area, be called for short RSRP) safeguard a threshold value, and this threshold value is indicated to all UE in community by signaling, UE adjudicates according to the difference D of the Serving cell measured and adjacent cell RSRP, when D value is less than above-mentioned thresholding, UE just forwards the downlink synchronous signal of own base station.
For convenience, find that signal instruction UE forwards the resource distribution of synchronizing signal with D2D below.The present invention is not limited to the communication that D2D finds signal, also can be that other D2D find signal.Pass-through mode one described below and pass-through mode two are two kinds of optional downlink synchronous signal pass-through modes.
Pass-through mode one:
The downlink synchronous signal forwarded accounts for middle 6 RB on frequency domain, consistent with the synchronizing signal of LTE system.In time domain, converting downlink synchronizing signal in some discovery subframes in discovery resource period.Fig. 7 is the forwarding resource location exemplary plot of the pass-through mode one according to the embodiment of the present invention.In the figure 7, in each discovery resource period, first discovery subframe 71 forwards synchronizing signal.Other finds in subframe as 72,73 do not forward synchronizing signal.
Forward in synchronizing signal, PSS is fixedly mapped on the symbol k in forwarding subframe, and k is OFDM symbol index in a subframe, value 0 ~ 13.
SSS is mapped to (except k, i.e. l ≠ k) on other symbol l of the same subframe with PSS.With the D2D forwarding UE affiliated subdistrict, side-play amount between l and k finds that signal resource configuration index M exists the mapping relations determined.D2D described herein finds to distribute to the resource information that D2D finds signal in the corresponding community (namely forward the community at UE place, it is equivalent to the second community) of signal resource configuration index M, different call number M is corresponding different resource allocation information.Forward UE and place PSS/SSS respectively according to certain mapping principle, after reception UE detects PSS/SSS, obtain Timing Synchronization and adjacent area discovery resource distribution index M according to certain mapping principle, thus acquisition adjacent area D2D finds the resource allocation information that signal is concrete.
Particularly, when forwarding UE mapping PSS/SSS, first according to predefined k value, PSS is placed on symbol k; Again according to the value finding resource distribution call number M, obtain the side-play amount l ' of PSS and SSS place notation index, here M=0 ~ M '-1, M ≠ 1, M ' for maximum get 13 positive integer, M ≠ 1 is disturbed to not produce the synchronous search of adjacent area honeycomb UE.Notice that the side-play amount of notation index described here is one-way circulation side-play amount, namely only get side-play amount to a direction (as left), the side-play amount in another direction is transformed on corresponding cycle offset by the mode of delivery.As got cycle offset left, the call number that l is less than k value, can directly be obtained by k – l, the call number then k – l<0 that l is larger than k, for conventional CP, can pass through 14+ (k – l) and realize circulation skew.Therefore following corresponding relation is had:
L '=k – l (l≤k) (formula 1)
L '=14+ (k – l) (l>k) (formula 2)
The above-mentioned just explanation side-play amount l ' of notation index and the corresponding relation of PSS place notation index k and SSS place notation index l.And in forwarding UE side, the value of l be determined, then need to obtain l ' according to discovery resource distribution index M, and then obtain the value of l.
L ' with the corresponding relation of M is:
L '=M+1 (formula 3)
Can be obtained the notation index l of SSS mapping by l ', mapping relations are:
L=k – l ' (l '≤k) (formula 4)
L=l ' (l ' > k) (formula 5)
In reception UE side, after the PSS of forwarding being detected, the symbol k value at PSS place can be known according to predefine, and obtain subframe timing.In same subframe, detecting SSS, according to detecting that the notation index value l of SSS can obtain the symbol offset amount l ' of SSS and PSS, according to formula being:
L '=k – l (l≤k) (formula 6)
L '=14+ (k – l) (l>k) (formula 7)
After obtaining l ', adjacent area can be obtained according to l=l ’ – 1 and find resource distribution index M value.According to the subframe timing obtained and resource distribution corresponding to M, other that can obtain radio frames timing and find in resource period finds subframe position.
Fig. 8 is the Mapping Examples forwarding synchronizing signal according to a UE of the corresponding pass-through mode one of the embodiment of the present invention, and 82 and 83 is the mapping position of PSS, and 81 and 84 is the mapping position of SSS.Which show the following two kinds mapping mode:
（1）k=12，l=1，l’=11，M=10；
（2）k=3，l=11，l’=6，M=5；
Pass-through mode two:
Forward synchronizing signal on frequency domain, account for middle 6 RB, consistent with the PSS/SSS of LTE.In time domain, in discovery resource period, the subframe 0 that all correspondences are found the radio frames of subframe all forwards PSS and SSS; The subframe 5 of some special radio frames containing discovery subframe only forwards PSS.
Fig. 9 is an example of the resource location of the forwarding synchronizing signal of corresponding pass-through mode two according to the embodiment of the present invention, this example be to find in resource period first containing be found subframe radio frames subframe 5 on forward PSS.Correspond to Fig. 9, find that in resource period, the subframe 0 of 91 and 93 correspondences forwards PSS and SSS simultaneously at one, 92 corresponding subframes 5 forward PSS, and 94 corresponding subframes 5 do not forward synchronizing signal.
The mapping mode of PSS/SSS in a subframe that mode two forwards and aforesaid way one similar.In forwarding UE side, be first the sign map PSS of k according to predefined fixed form at the index containing the subframe 0 finding subframe radio frames, in same subframe 0, determine side-play amount l ' according to discovery resource distribution index M, then obtain the notation index l mapping SSS in conjunction with l ' and k.From M to l ' mapping equation that arrives l is again identical with mode 1.For in discovery resource period, in the subframe 5 of corresponding special radio frames, also map on PSS to symbol k according to the fixed form identical with subframe 0.Equally, in order to not produce interference to the synchronous search of adjacent area honeycomb UE, M ≠ 1 is got.
When adjacent area UE obtains reception timing, detect PSS/SSS, if PSS and SSS detected, then can get frame synchronization, adjacent area CellId and find resource distribution index M, again the radio frames being found subframe is detected, detect and only have PSS and without the subframe of SSS, can determine that in the cycle, start frame is with reference to timing according to its specific position.If first detect that subframe 5(only has PSS), then directly can determine that in the cycle, start frame is with reference to timing, then have the subframe 0 of PSS/SSS to detect adjacent area CellId and resource distribution index M by another.
Figure 10 is the Mapping Examples forwarding synchronizing signal according to a UE of the corresponded manner two of the embodiment of the present invention, and 102,103,104 and 106 is PSS mapping position, and 101 and 105 is SSS mapping position.Which show the following two kinds mapping mode:
（1）k=12，l=1，l’=11，M=10；
（2）k=3，l=12，l’=5，M=4；
Wherein, k is the notation index that PSS maps, and l is the notation index that SSS maps, and l ' is side-play amount, i.e. the notation index difference of PSS and SSS, and M is that D2D finds resource distribution index.
Embodiment three
In the present embodiment, D2D UE forwards the downlink synchronous signal of adjacent area thus the downlink synchronous signal of acquisition adjacent area by the UE in this community, and then determines that the D2D of adjacent area finds the reception timing of signal.
Figure 11 be according to the preferred embodiment of the invention D2D find signal communication the third realize the schematic diagram of principle, as shown in figure 11, UE113 can detect the downlink synchronous signal of adjacent area Cell111 and Cell112, and UE114 can not detect the downlink synchronous signal of adjacent area Cell111 and Cell112.
UE113 corresponding uplink time/frequency source forwards respectively the downlink synchronous signal of adjacent area Cell111 and Cell112 in the Serving cell of its correspondence, and forward signal is only mark a forward signal in 1114, figure in figure, but does not limit the number of signals that UE113 forwards.For the downlink synchronous signal of each adjacent area forwarded, the resource location of forward signal and the mapping mode of PSS/SSS can select the mode one in embodiment two or the method in mode two.But for each adjacent area, the cycle that corresponding synchronizing signal forwards may become large, such as: become original N times, N is the adjacent area number that UE113 will forward synchronizing signal, at the present embodiment, N=2.
Each base station increases the resource allocation information that instruction this community D2D finds signal in broadcast message, UE113 is by detecting the broadcast message of adjacent area Cell111 and Cell112, the D2D obtaining corresponding adjacent area finds the resource allocation information that signal is corresponding, and the D2D resource allocation information of adjacent area can be shared with other UE in community.Such as, by any one in following two kinds of modes, the D2D resource allocation information of adjacent area can be shared with other UE in this community:
Mode 1: according to certain mapping method, the D2D that the neighbor synchronization signal that UE113 forwards carries corresponding adjacent area finds the resource allocation information that signal is corresponding, and described certain mapping method can be the mapping method described in embodiment two.
Mode 2: if UE113 is RRC connect (RRC_Connected) state, then the D2D resource allocation information of adjacent area can be reported serving BS, the D2D of adjacent area, by carrying indication information in signaling is as broadcast, is found that the resource allocation information that signal is corresponding is indicated to other UE in community by base station.
The downlink synchronous signal of adjacent area Cell111 and Cell112 that UE114 forwards from the UE113 in same community obtains the transmission timing of the D2D discovery signal of corresponding adjacent area, determine that the D2D of corresponding adjacent area Cell111 and Cell112 finds the reception timing of signal, simultaneously by the way 1 or mode 2 D2D that obtains adjacent area Cell111 and Cell112 find the resource allocation information that signal is corresponding.Find that Signal reception timing and adjacent area D2D resource allocation information receive and parse the content that adjacent area D2D finds signal according to the D2D determined, the D2D sent as UE115 finds signal 1113.
Embodiment four
In the present embodiment, in this community of D2D UE, other UE calculate and the timing offset of reporting neighboring cell and D2D UE affiliated subdistrict, and base station calculates the standard deviation amount of adjacent area according to the timing offset that other UE report, and standard side-play amount is handed down to D2D UE.
Figure 12 is that D2D finds the 4th kind of the signal communication schematic diagram realizing principle according to the preferred embodiment of the invention, as shown in figure 12, Cell120, Cell121 and Cell122 are the cellular cell of corresponding different base station respectively, UE123, UE124 are under the jurisdiction of Cell120, UE125 and UE126 is subordinate to Cell121 and Cell122 respectively.UE123 can detect the downlink synchronous signal 1211 and 1212 of adjacent area Cell121 and Cell122, obtains the descending timing of adjacent area Cell121 and Cell122.And UE124 can not detect the downlink synchronous signal of adjacent area Cell121 and Cell122.
UE123 can obtain the descending timing of Serving cell according to the downlink synchronous signal 128 of Serving cell Cell120, and by calculating the timing offset δ T obtaining Serving cell Cell120 and adjacent area Cell121 and Cell122 respectively.Adjacent area CellId and corresponding δ T is reported base station corresponding to Serving cell Cell120 and serving BS by the UE being in RRC_Connected state.The δ T of each adjacent area that serving BS reports according to different UEs (the more than UE123 of possibility reports), the standard deviation amount of corresponding adjacent area is determined by default principle, called after δ T ', it should be noted that the description just conveniently in the present embodiment of naming standard side-play amount herein, the present invention is not construed as limiting.The standard deviation amount δ T of adjacent area Cell121 and Cell122 can be obtained like this 121' and δ T 122'.For above-mentioned default principle, preferably, this default principle can comprise: get the timing offset of timing correspondence arriving the earliest and receive UE, or gets the mean value of timing offset of all same adjacent areas reported.
Serving BS is such as broadcasted by signaling and is carried indication information, for UE all in community indicate the standard deviation amount δ T of adjacent area Cell121 and Cell122 121' and δ T 122'.For UE124, although the descending timing of adjacent area Cell121 and Cell122 directly can not be got, according to the indication information receiving serving BS and issue, the standard deviation amount δ T of corresponding adjacent area Cell121 and Cell122 can be obtained 121' and δ T 122'.Meanwhile, the descending timing T1 of serving BS is obtained according to the downlink synchronous signal 127 of Serving cell Cell120.By compensating the standard deviation amount of adjacent area on the basis of Serving cell timing, the timing of adjacent area can be determined.Such as use T1+ δ T respectively 121' and T1+ δ T 122' determine the descending timing of adjacent area Cell121 and Cell122, the reception timing of signal is found as the D2D receiving adjacent area Cell121 and Cell122.
UE123 can according to the criterion of mode 2 in embodiment three, the D2D obtaining adjacent area by detecting adjacent area broadcast message finds the resource allocation information that signal is corresponding, and the D2D of adjacent area is found that the resource allocation information that signal is corresponding reports serving BS, this resource allocation information, by carrying indication information in signaling as broadcasted, is indicated to other UE in community by base station.
Like this, to adjacent area D2D, UE124 can find that the reception of signal regularly receives with the adjacent area D2D resource allocation information got and solves the content that adjacent area D2D finds signal according to what determine, the D2D sent as UE125 finds signal 1215.
Embodiment five
For D2D, the present embodiment finds that signal illustrates that D2D finds the acquisition of the resource allocation information that signal is corresponding.Find that the acquisition of the resource allocation information that signal is corresponding can be realized by the signaling instruction of serving BS for this community D2D, the indication signaling of serving BS can be the existing signaling of LTE system, also can newly define signaling to indicate.Find that the acquisition of signal resource analytical information has description in above-described embodiment one to embodiment four to adjacent area D2D, the present embodiment is described further.
Figure 13 is the D2D signal communication structure schematic diagram according to the embodiment of the present invention, as shown in figure 13, UE133 and UE134 obtains D2D and finds the resource allocation information that signal is corresponding from the broadcast message SIB2 that Cell130 own base station issues, and the resource that resource allocation information is corresponding sends D2D and finds signal.Equally, UE135 and UE136 obtains D2D respectively and finds signal resource assignment information from the broadcast message SIB2 that Cell131 and Cell132 own base station issues, and corresponding resource sends D2D and finds signal.
Adjacent area D2D is found to the acquisition of the resource allocation information that signal is corresponding, have multiple method can realize, in the present embodiment, as shown in figure 13, be that Serving cell illustrates with Cell130, wherein, Cell130 is equivalent to the first community, Cell131 and Cell132 is equivalent to the second community.
Method 1: consistent with embodiment one, disposes for synchronizing network, according to this community D2D, UE133 and UE134 finds that the resource allocation information of signal receives the D2D that in Cell131 and Cell132 of adjacent area, UE sends and finds signal; Dispose for nonsynchronous network, the D2D that UE133 obtains adjacent area by the broadcast message of direct-detection adjacent area Cell131 and Cell132 finds the resource allocation information that signal is corresponding.
Method 2: consistent with embodiment two, UE134 is by resolving the downlink synchronous signal of the adjacent area of UE135 forwarding, and the D2D obtaining adjacent area Cell131 according to the mapping mode of PSS and SSS finds the resource allocation information that signal is corresponding.
Method 3: consistent with embodiment three, the downlink synchronous signal of the adjacent area that UE134 is forwarded by the UE133 resolving this community, the D2D obtaining adjacent area Cell131 and Cell132 according to the mapping mode of PSS and SSS finds the resource allocation information that signal is corresponding;
Method 4: consistent with embodiment four, the D2D that UE134 obtains adjacent area Cell131 and Cell132 by the signaling that the base station of Serving cell Cell130 issues finds the resource allocation information that signal is corresponding, and the D2D of adjacent area finds that the resource allocation information that signal is corresponding is got by the broadcast message of UE133 detection adjacent area Cell131 and Cell132.The resource allocation information detected is reported the base station of Cell130 by UE133.Or the D2D of adjacent area finds that the resource allocation information that signal is corresponding can also obtain in the following manner: the base station of Cell130 obtains D2D alternately with the base station of adjacent area Cell131 and Cell132 respectively by X2 interface or non-standard interface and finds the resource allocation information that signal is corresponding;
Method 5: in the Cell131 of adjacent area, the D2D of UE135 forwarding community Cell131 finds the resource allocation information that signal is corresponding, the D2D that UE134 obtains adjacent area Cell131 by the forward signal of UE135 finds the resource allocation information that signal is corresponding.
Embodiment six
The present embodiment solves in nonsynchronous network deployment, realizes D2D and find signal communication between the neighbor cell of different base station.Realize D2D in the present embodiment and find that the method for signal communication can comprise: the transmission timing obtaining adjacent area UE, and the resource allocation information of adjacent area UE, realize reception adjacent area D2D being found to signal, and the D2D correctly solving adjacent area finds signal.Wherein, adjacent area is equivalent to the second community, receives D2D and finds that the community at the subscriber equipment place of signal is the first community.
Specifically: D2D UE affiliated subdistrict is reference cell i.e. the first community, adjacent area is not in the neighbor cell of same eNB with reference cell, D2D UE gets according to predefined criterion the transmission timing that adjacent area D2D finds signal, sends timing receive adjacent area D2D discovery signal according to this; D2D UE obtains the resource allocation information of adjacent area D2D UE again according to predefined criterion, receive adjacent area D2D find signal in the resource that this resource allocation information is corresponding; Complete reception adjacent area D2D being found to signal, and the D2D solving the adjacent area received finds signal.
Above-mentioned acquisition adjacent area D2D finds that the criterion of the transmission timing of signal comprises:
(1) adjacent area UE forwards the downlink synchronous signal PSS/SSS of adjacent area respective base station, and D2D UE detects the downlink synchronous signal acquisition adjacent area D2D UE transmission timing that adjacent area UE forwards;
(2) D2D UE is by the downlink synchronous signal PSS/SSS of direct-detection adjacent area, gets the transmission timing of adjacent area D2D UE;
(3) the D2D UE directly detecting adjacent area downlink synchronous signal PSS/SSS forwards the downlink synchronous signal PSS/SSS of adjacent area in affiliated subdistrict, and the D2D UE that the D2D UE that in community, other can not directly detect adjacent area downlink synchronous signal obtains adjacent area by the adjacent area downlink synchronous signal that other UE in detected cells forwards sends timing;
(4) serving BS by X2 mouth or non-standard interface mutual, or feedback ratio such as the reporting information that can directly detect the UE of adjacent area downlink synchronous signal PSS/SSS in Serving cell obtains adjacent area timing information, and D2D UE obtains adjacent area timing information by serving BS.
Above-mentioned acquisition adjacent area D2D finds that the criterion of the resource allocation information that signal is corresponding comprises:
(1) configured by the different mapping of PSS and SSS forwarded adjacent area UE, carry the resource allocation information of adjacent area UE, after D2D UE detects PSS and SSS that adjacent area UE forwards, obtain the resource allocation information of adjacent area UE according to different mappings configuration;
(2) in the broadcast message of adjacent area, increase indication information D2D being found to the resource allocation information that signal is corresponding, D2D UE, by resolving adjacent area broadcast message, obtains the resource allocation information of adjacent area UE;
(3) D2D UE finds from acquisition adjacent area, the base station D2D of affiliated subdistrict the resource allocation information that signal is corresponding;
(4) adjacent area UE directly forwards adjacent area D2D and finds the resource allocation information that signal is corresponding.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (24)

1. a communication means of device-to-device D2D, is characterized in that, described method comprises:
D2D user equipment (UE) in first community determines the reception timing D2D of the second community being found to signal, and obtains resource allocation information corresponding to described D2D discovery signal;
Described D2D UE receives described D2D according to described reception timing and described resource allocation information and finds signal.
2. method according to claim 1, is characterized in that, described D2D UE determines to find that the reception timing of signal comprises to the described D2D of described second community:
Described D2D UE detects the downlink synchronous signal of described second community;
According to detected described downlink synchronous signal, described D2D UE determines that described D2D finds the transmission timing of signal, and described transmission timing is defined as described reception timing.
3. method according to claim 1, is characterized in that, described D2D UE determines to find that the reception timing of signal comprises to the described D2D of described second community:
Described D2D UE detects the downlink synchronous signal of described second community that at least one UE in described second community forwards, and wherein, at least one UE described determines according to the Reference Signal Received Power RSRP of the UE in described second community or timing advance TA;
According to detected described downlink synchronous signal, described D2D UE determines that described D2D finds the transmission timing of signal, and described transmission timing is defined as described reception timing.
4. method according to claim 3, is characterized in that, at least one UE described is comprising of determining according to RSRP or TA of the UE in described second community:
At least one UE described is after the difference determined between the described first community RSRP that UE in described second community is corresponding and described second community RSRP of described second community own base station, the maximum M of a described difference UE is selected to obtain, wherein, described M is positive integer; Or
At least one UE described is that after described second community own base station obtains UE in described second community TA value separately, select the maximum N number of UE of described TA value to obtain, wherein, described N is positive integer.
5. method according to claim 1, is characterized in that, described D2D UE determines to find that the reception timing of signal comprises to the described D2D of described second community:
Described D2D UE detects the downlink synchronous signal of described second community that other UE forward in described first community, and wherein, other UE described are the UE of the downlink synchronous signal that described second community can be detected in described first community;
According to detected described downlink synchronous signal, described D2D UE determines that described D2D finds the transmission timing of signal, and described transmission timing is defined as described reception timing.
6. method according to claim 1, is characterized in that, described D2D UE determines to find that Signal reception timing comprises to the described D2D of described second community:
Described D2D UE receives the Indication message of described D2D UE own base station, and wherein, described Indication message carries the timing information of described second community;
Described D2D UE determines described reception timing according to described timing information.
7. method according to claim 6, is characterized in that, described timing information is obtained by following mode one of at least:
Obtained from described second community own base station alternately by the X2 interface between described first community own base station and described second community own base station;
Obtained from described second community own base station by the radio open between described first community own base station and described second community own base station or non-standard interface;
Obtain by the reporting information that the UE of the downlink synchronous signal of described second community can be detected in described first community.
8. method according to claim 6, it is characterized in that, the timing information of described second community comprises: the standard deviation amount of described second community that the timing offset of described first community reported according at least one UE in described first community is determined, wherein, described timing offset obtains according to the downlink synchronous signal of described first community and the downlink synchronous signal of described second community.
9. method according to claim 1, is characterized in that, obtains described D2D and finds that the described resource allocation information that signal is corresponding comprises:
Described D2D UE detects the broadcast message of described second community;
Described D2D UE obtains described resource allocation information from described broadcast message.
10. method according to claim 1, is characterized in that, obtains described D2D and finds that the described resource allocation information that signal is corresponding comprises:
Described D2D UE detects the downlink synchronous signal of described second community that at least one UE in described second community forwards, and wherein, at least one UE described determines according to RSRP or TA of the UE in described second community;
Described D2D UE forwarding the diverse location mapped respectively in subframe, obtains described resource allocation information according to the master sync signal PSS of detected described downlink synchronous signal and auxiliary synchronous signals SSS.
11. methods according to claim 1, is characterized in that, obtain described D2D and find that the described resource allocation information that signal is corresponding comprises:
Described D2D UE detects the downlink synchronous signal of described second community that other UE forward in described first community, and wherein, other UE described are the UE of the described downlink synchronous signal that described second community can be detected in described first community;
Described D2D UE forwarding the diverse location mapped respectively in subframe, obtains described resource allocation information according to the master sync signal PSS of detected described downlink synchronous signal and auxiliary synchronous signals SSS.
12. methods according to claim 1, is characterized in that, obtain described D2D and find that the described resource allocation information that signal is corresponding comprises:
Described D2D UE receives the Indication message of described D2D UE own base station, and wherein, described Indication message carries described resource allocation information;
Described D2D UE obtains described resource allocation information from described Indication message.
13. methods according to claim 12, is characterized in that, the described resource allocation information carried in described Indication message is got by following mode one of at least:
Obtained from described second community own base station alternately by the X2 interface between described first community own base station and described second community own base station;
Obtained from described second community own base station alternately by the radio open between described first community own base station and described second community own base station or non-standard interface;
Obtain by the reporting information that the UE of the described resource allocation information of described second community can be detected in described first community;
Obtained from described second community own base station alternately by upper layer network, wherein, described upper layer network is the Web communication layer higher than described base station layer.
14. methods according to claim 1, is characterized in that, obtain described D2D and find that the described resource allocation information that signal is corresponding comprises: the described resource allocation information that the UE receiving described second community directly forwards.
15. 1 kinds of user equipment (UE)s, described UE is under the jurisdiction of the first community, it is characterized in that, comprising:
Determination module, for determining the reception timing D2D of the second community being found to signal;
Acquisition module, finds for obtaining described D2D the resource allocation information that signal is corresponding;
Receiver module, finds signal for receiving described D2D according to described reception timing and described resource allocation information.
16. UE according to claim 15, is characterized in that, described determination module comprises:
Detecting unit, for detecting the downlink synchronous signal of described second community;
Determining unit, for determining that according to detected described downlink synchronous signal described D2D finds the transmission timing of signal, and is defined as described reception timing by described transmission timing.
17. UE according to claim 15, is characterized in that, described determination module comprises:
Detecting unit, for the downlink synchronous signal of described second community that at least one UE detected in described second community forwards, wherein, at least one UE described determines according to the Reference Signal Received Power RSRP of the UE in described second community or timing advance TA;
Determining unit, for determining that according to detected described downlink synchronous signal described D2D finds the transmission timing of signal, and is defined as described reception timing by described transmission timing.
18. UE according to claim 15, is characterized in that, described determination module comprises:
Detecting unit, for detecting the downlink synchronous signal of described second community that other UE forward in described first community, wherein, other UE described are the UE of the downlink synchronous signal that described second community can be detected in described first community;
Determining unit, for determining that according to detected described downlink synchronous signal described D2D finds the transmission timing of signal, and is defined as described reception timing by described transmission timing.
19. UE according to claim 1, is characterized in that, described determination module comprises:
Detecting unit, for receiving the Indication message of described D2D UE own base station, wherein, described Indication message carries the timing information of described second community;
Determining unit, for determining described reception timing according to described timing information.
20. UE according to claim 1, is characterized in that, described acquisition module comprises:
Resources measurement unit, for detecting the broadcast message of described second community;
Acquiring unit, for obtaining described resource allocation information from described broadcast message.
21. UE according to claim 1, is characterized in that, described acquisition module comprises:
Resources measurement unit, the downlink synchronous signal of described second community that at least one UE for detecting in described second community forwards, wherein, at least one UE described determines according to RSRP or TA of the UE in described second community;
Acquiring unit, for the diverse location mapped respectively in forwarding subframe according to master sync signal PSS and the auxiliary synchronous signals SSS of detected described downlink synchronous signal, obtains described resource allocation information.
22. UE according to claim 1, is characterized in that, described acquisition module comprises:
Resources measurement unit, for detecting the downlink synchronous signal of described second community that other UE forward in described first community, wherein, other UE described are the UE of the described downlink synchronous signal that described second community can be detected in described first community;
Acquiring unit, for the diverse location mapped respectively in forwarding subframe according to master sync signal PSS and the auxiliary synchronous signals SSS of detected described downlink synchronous signal, obtains described resource allocation information.
23. UE according to claim 1, is characterized in that, described acquisition module comprises:
Resources measurement unit, for receiving the Indication message of described D2D UE own base station, wherein, described Indication message carries described resource allocation information;
Acquiring unit, for obtaining described resource allocation information from described Indication message.
24. UE according to claim 1, is characterized in that, described acquisition module comprises: acquiring unit, the described resource allocation information that the UE for receiving described second community directly forwards.
CN201410042165.5A 2014-01-28 2014-01-28 The communication means and UE of D2D Active CN104812089B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410042165.5A CN104812089B (en) 2014-01-28 2014-01-28 The communication means and UE of D2D

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410042165.5A CN104812089B (en) 2014-01-28 2014-01-28 The communication means and UE of D2D

Publications (2)

Publication Number Publication Date
CN104812089A true CN104812089A (en) 2015-07-29
CN104812089B CN104812089B (en) 2019-07-02

Family

ID=53696432

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410042165.5A Active CN104812089B (en) 2014-01-28 2014-01-28 The communication means and UE of D2D

Country Status (1)

Country Link
CN (1) CN104812089B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017024890A1 (en) * 2015-08-13 2017-02-16 华为技术有限公司 Device-to-device communication method, apparatus and system
CN107926004A (en) * 2015-08-06 2018-04-17 三星电子株式会社 Method and apparatus for performing intercarrier D2D communications
CN107925977A (en) * 2015-08-21 2018-04-17 Lg电子株式会社 The method and apparatus for sending/receiving the signal of V2X terminals in a wireless communication system
WO2020029234A1 (en) * 2018-08-10 2020-02-13 Zte Corporation Method and apparatus for synchronization in sidelink communications

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103250435A (en) * 2012-12-31 2013-08-14 华为技术有限公司 Device to device communication method, apparatus and system
CN103338497A (en) * 2013-06-14 2013-10-02 北京交通大学 Autonomous equipment discovering method in D2D communication system
CN103379617A (en) * 2012-04-26 2013-10-30 华为技术有限公司 User equipment-to-user equipment communication method and user equipment
WO2013174091A1 (en) * 2012-05-23 2013-11-28 华为技术有限公司 Lte cellular communication system based d2d device discovering method and apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103379617A (en) * 2012-04-26 2013-10-30 华为技术有限公司 User equipment-to-user equipment communication method and user equipment
WO2013174091A1 (en) * 2012-05-23 2013-11-28 华为技术有限公司 Lte cellular communication system based d2d device discovering method and apparatus
CN103250435A (en) * 2012-12-31 2013-08-14 华为技术有限公司 Device to device communication method, apparatus and system
CN103338497A (en) * 2013-06-14 2013-10-02 北京交通大学 Autonomous equipment discovering method in D2D communication system

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107926004A (en) * 2015-08-06 2018-04-17 三星电子株式会社 Method and apparatus for performing intercarrier D2D communications
US11778448B2 (en) 2015-08-06 2023-10-03 Samsung Electronics Co., Ltd. Method and apparatus for performing inter-carrier D2D communication
CN107926004B (en) * 2015-08-06 2022-03-18 三星电子株式会社 Method and apparatus for performing inter-carrier D2D communication
US11228893B2 (en) 2015-08-06 2022-01-18 Samsung Electronics Co., Ltd. Method and apparatus for performing inter-carrier D2D communication
US11191114B2 (en) 2015-08-13 2021-11-30 Huawei Technologies Co., Ltd. Method, apparatus and system for obtaining device-to-device communication resource
CN106454746A (en) * 2015-08-13 2017-02-22 华为技术有限公司 Device-to-device communication method, device and communication system thereof
JP2018527817A (en) * 2015-08-13 2018-09-20 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． Inter-device communication method, device, and system
RU2678661C1 (en) * 2015-08-13 2019-01-30 Хуавэй Текнолоджиз Ко., Лтд. Device-device communication method, device and system
CN106454746B (en) * 2015-08-13 2020-06-26 华为技术有限公司 Device-to-device communication method, device and system
WO2017024890A1 (en) * 2015-08-13 2017-02-16 华为技术有限公司 Device-to-device communication method, apparatus and system
CN107925977B (en) * 2015-08-21 2021-02-26 Lg电子株式会社 Method and apparatus for transmitting/receiving signal of V2X terminal in wireless communication system
US11277826B2 (en) 2015-08-21 2022-03-15 Lg Electronics Inc. Method and device for transmitting/receiving signal of V2X terminal in wireless communication system
CN107925977A (en) * 2015-08-21 2018-04-17 Lg电子株式会社 The method and apparatus for sending/receiving the signal of V2X terminals in a wireless communication system
CN112544110A (en) * 2018-08-10 2021-03-23 中兴通讯股份有限公司 Method and apparatus for synchronization in link communications
WO2020029234A1 (en) * 2018-08-10 2020-02-13 Zte Corporation Method and apparatus for synchronization in sidelink communications
US11997625B2 (en) 2018-08-10 2024-05-28 Zte Corporation Method and apparatus for synchronization in sidelink communications

Also Published As

Publication number Publication date
CN104812089B (en) 2019-07-02

Similar Documents

Publication Publication Date Title
WO2016019734A1 (en) D2d communication method and device
US10863460B2 (en) Method and apparatus for synchronization operation in cellular internet of things networks
JP6641465B2 (en) Reference signal transmission method and terminal in D2D communication
CN104704898B (en) Method, user equipment and the base station of communication
CN103686985B (en) Method for discovering equipment and device for device-to-device communication
EP2319259B1 (en) Method and arrangement, cell id collision detection
JP6692641B2 (en) Inter-cell interference control compatible with machine type communication
CN103997788B (en) Method for discovering equipment and user equipment, network side equipment for device-to-device communication
US10382242B2 (en) Network listening method and device
CN104854949A (en) System and method for random access in heterogeneous communications systems
CN104349421A (en) Device discovery method, user equipment and network side device
CN103108405A (en) Method and system of wireless communication
WO2015184917A1 (en) Device-to-device communication method and device, and device-to-device communication control device
CN103997727B (en) A kind of method for discovering equipment and device
CN109891979B (en) Method and apparatus for performing multi-beam based random access procedure in wireless communication
WO2014101681A1 (en) Wireless communications method, user equipment, network device, and system
CN104885391A (en) Method of receiving downlink signal, user device, method of transmitting downlink signal, and base station
US10383025B2 (en) Method for controlling handover in wireless communication system, and device therefor
CN104812075A (en) Device discovery signal transmitting method, device and system
WO2015176517A1 (en) Device-to-device resource configuration method, network device, and user equipment
CN104737577A (en) Communication system, base station device and communication method
CN104812089A (en) D2d communication method and ue
KR101652929B1 (en) Method and Apparatus for transmitting/receiving a Synchronization signal in Wireless Communication System
CN104618985B (en) Sending method, device, equipment and the system of equipment discovery signal
WO2016070682A1 (en) Synchronous processing method and device in d2d communication

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant