CN104852880A - Synchronization method and terminal for direct communication between LTE terminal - Google Patents
Synchronization method and terminal for direct communication between LTE terminal Download PDFInfo
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- CN104852880A CN104852880A CN201510189869.XA CN201510189869A CN104852880A CN 104852880 A CN104852880 A CN 104852880A CN 201510189869 A CN201510189869 A CN 201510189869A CN 104852880 A CN104852880 A CN 104852880A
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Abstract
The present invention provides a synchronization method and terminal for direct communication between LTE terminals. The method comprises that unique identifications are distributed to terminals in a system, and the terminals set their own primary synchronization signal (PSS) and secondary synchronization signal (SSS) sequences according to the identifications and issue their own PSS and SSS sequences according to timing sequence cycles; when a calling terminal needs to communicate with other terminals, signal synchronization of the calling terminal and a target terminal is realized by the calling terminal receiving the PSS and SSS sequences of the target terminal; the calling terminal calls a called terminal one cyclic prefix (CP) in advance at a timing point when the target terminal sends out signal synchronization; because the terminal direct communication distance is not long, the CP technology can ensure that the target terminal successfully resolve information sent by the calling terminal so as to realize signal synchronization with the calling terminal, two terminals for following direct communication see each other as a base station and synchronize signals sent by the two terminals without adjusting signals sent by themselves, thereby realizing time synchronization of direct communication between the LTE terminals.
Description
Technical field
The present invention relates to the communications field, particularly relate to synchronous method straight-through between a kind of LTE terminal and terminal.
Background technology
Between terminal, the technology of direct communication is also in 2G level at present, and what transmit between terminal also only rests on speech business, far can not meet actual requirement, also be faced with the demands such as data traffic transmission between terminal.
Current public network has entered the LTE epoch, and existing emergency system all realizes emergency communication by building emergent Access Network temporarily.But inherently there is the risk of being attacked by secondary in the emergent Access Network started under special circumstances.Meanwhile, be not any moment, emergency system all successfully can be built in any place, and the demand that therefore LTE terminal is straight-through is obvious especially.
Higher requirement is there is in LTE technology to the time.In wireless transmission process, when LTE technical requirement incoming end receives the data that transmit leg sends, receive moment error that moment of data and transmit leg data arrive at a CP(Cyclic Prefix, Cyclic Prefix) scope in; Be no more than a CP in error, receiving terminal can pass through prior art, accurately resolves the data received.When error is more than a CP, receiving terminal not only correctly may cannot resolve the data of this transmission, but also may affect the transmission of adjacent sub-frame.
Summary of the invention
To the invention provides between LTE terminal straight-through synchronous method and terminal, synchronous owing to realizing for solving existing LTE terminal, and the problem that leads directly to cannot be carried out.
To achieve these goals, synchronous method straight-through between a kind of LTE terminal provided by the invention, comprising:
System is the unique mark of straight-through terminal distribution, mark described in terminal and the PSS(Primary Synchronization Signal oneself issued, first synchronizing signal) and SSS(Secondary Synchronization Signal, second synchronizing signal) sequence is corresponding one by one, described terminal is according to sequential, the method of similar base station, the cycle issues PSS and SSS signal.
When calling terminal needs to communicate with other-end, this terminal is by receiving PSS and SSS described in terminal called, and the signal sent realizing self reception and terminal called is synchronous.
Calling terminal is sending the synchronous time point of signal with terminal called, carries previous CP and calls out terminal called; Because the distance of terminal direct connection is not far, CP technology is enough to guarantee the information that terminal called is successfully resolved calling terminal and sent, realize and signal that calling terminal sends synchronous.
The other side is all considered as base station, the signal that synchronization counterpart sends by follow-up straight-through terminal both sides, and the signal that self sends does not adjust, and achieves time synchronized straight-through between LTE terminal.
To achieve these goals, synchronous method straight-through between LTE terminal provided by the invention, comprising:
In advance for needing straight-through described terminal to arrange unique mark, described terminal obtains unique PSS and SSS combined sequence according to unique mark.
Described terminal issues the resource allocation method of PSS and SSS with reference to existing base station, issues PSS and SSS sequence in the interface-free resources cycle of correspondence.
When described calling terminal needs to communicate with described terminal called, this terminal is by receiving PSS and SSS described in terminal called, and the signal sent realizing self reception and terminal called is synchronous.
Described calling terminal is according to the mark of described terminal called, calculate PSS and the SSS sequence of described terminal called, then at PSS and SSS of removal search identical sequence that eat dishes without rice or wine, described calling terminal is according to after receiving PSS and SSS sequence that described target terminal sends, adopt prior art, allow described calling terminal receive direction and described terminal called sender carry out synchronously.
Described calling terminal is sending the synchronous time point of signal with described terminal called, carries previous CP and calls out described terminal called; Because the distance of terminal direct connection is not far, CP technology is enough to guarantee the information that described terminal called is successfully resolved described calling terminal and sent, so realize and signal that described calling terminal sends synchronous.
Described calling terminal and described terminal called is follow-up all the other side is considered as base station, the signal that synchronization counterpart sends, the signal simultaneously self sent does not adjust.Achieve LTE terminal lead directly between time synchronized.
To achieve these goals, a kind of terminal provided by the invention, comprising:
Sequence generating module: for the mark according to terminal, generates unique PSS and SSS combined sequence;
Sending module: described terminal periodic sends the sequence of PSS and SSS of self, sequence period sends by described terminal called;
Receiver module: receive described terminal and issue PSS and SSS sequence;
Synchronization module: the information according to receiving Correspondent Node is measured, according to oneself the time of reception of information adjustment measured, realizes the receiver module of oneself and the transmitting of opposite end is carried out synchronously.
The invention provides synchronous method straight-through between a kind of LTE terminal and terminal, method comprises for the unique mark of the terminal distribution in system, terminal arranges PSS and the SSS sequence of oneself according to described mark, and described terminal issues PSS and the SSS sequence of oneself according to timing cycles; When calling terminal needs to communicate with other-end, this terminal is by PSS and the SSS sequence described in receiving target terminal, and the signal sent realizing self reception and target terminal is synchronous; Calling terminal sends the synchronous time point of signal at target terminal, carries previous CP and calls out terminal called; Because the distance of terminal direct connection is not far, CP technology guarantees the information that target terminal successfully parses calling terminal and sends, and then realize and the signal that sends of calling terminal synchronous, the other side is all considered as base station by follow-up straight-through terminal both sides, the signal that synchronization counterpart sends, and the signal that self sends does not adjust, achieve time synchronized straight-through between LTE terminal.
Accompanying drawing explanation
The schematic flow sheet that the calling terminal of synchronous method straight-through between a kind of LTE terminal that Fig. 1 provides for the embodiment of the present invention one is synchronous;
The schematic flow sheet that the terminal called of synchronous method straight-through between a kind of LTE terminal that Fig. 2 provides for the embodiment of the present invention two is synchronous;
The structural representation of the terminal of synchronous method straight-through between a kind of LTE terminal that Fig. 3 provides for the embodiment of the present invention three.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.
Fig. 1 is the embodiment of the present invention one, the schematic flow sheet that the calling terminal of synchronous method straight-through between a kind of LTE terminal is synchronous.As shown in Figure 1, this synchronous method comprises the following steps:
The mark of the terminal called 101, will called out according to calling terminal, obtains PSS and the SSS combined sequence that described terminal called issued in the cycle of eating dishes without rice or wine, and in search PSS and SSS sequence of eating dishes without rice or wine.
Wherein, the mark of described terminal called participates in mark unique among straight-through all terminals, and that is, any one mark does not exist two or more terminal and corresponds, and is tackle one by one between terminal and mark.Its PSS sequence and be also corresponding one by one between SSS combined sequence and terminal iidentification.
Particularly, terminal, be associated completely between terminal iidentification and the combined sequence of PSS and SSS, the combined sequence of PSS and SSS and terminal iidentification are all the differences between terminal.Its PSS and SSS periodically issues in fixing interface-free resources, and its mode issued adopts existing base station to issue the method for PSS and SSS sequence.
102, described calling terminal is by the PSS sequence that receives and SSS sequence, realize the reception of described calling terminal and described terminal called send between carry out synchronous.
Calling terminal receives PSS and the SSS combined sequence that terminal called is eating dishes without rice or wine to issue, wherein the combined sequence antijamming capability of PSS and SSS is strong, terminal can search the combined sequence of PSS and SSS of terminal called from eating dishes without rice or wine, thus the transmitting terminal of the reception of calling terminal and terminal called can be made synchronous by prior art, concrete technology, see 36 serial protocols of 3GPP, no longer repeats herein.Thus can guarantee that described calling terminal correctly can receive and resolve the data that described terminal called sends.
103, described calling terminal is from receiving synchronous time point, carries previous CP and sends calling to terminal called.
Terminal needs straight-through distance not far, and this is not only the restriction of application scenarios, and is the result of transmitting power restriction of terminal.According to the result calculated, terminal direct connection use expansion CP receptible propagation delay time exceeded the emissivities of terminal and the demand of application scenarios, as long as therefore described calling terminal is receiving synchronous time point, carry previous CP and send calling to described terminal called, when the data that described calling terminal sends arrive described terminal called, its time deviation must within the scope of a CP.According to existing technology, described terminal called correctly can resolve the data that described calling terminal is sent, and the processing procedure of described terminal called asks for an interview embodiment two.
104, described terminal called is considered as base station by described calling terminal, and oneself is considered as terminal, the communication of both sides is considered as terminal with the communication between base station.Adjust voluntarily oneself time of reception, what keep receiving terminal and described terminal called to send is synchronous.
Wherein, described terminal called is considered as base station by described calling terminal, and oneself is considered as terminal; Described calling terminal receives and described terminal called transmission synchronous, and its synchronous method is as the down-going synchronous of terminal and base station, and concrete technology is see 3GPP serial protocols.In described calling and called terminal call process, described calling terminal also uses similar method, guarantees that the reception of described calling terminal and described terminal called send synchronous.
Described calling terminal be sent in first send calling after, no longer carry out any adjustment.In subsequent communications process, the transmitting portion of oneself is considered as the up of step-out never or forever can not receive the terminal of uplink synchronous notice.
The synchronous method that described calling terminal receives and described terminal called sends that the present embodiment provides, described calling terminal utilizes the strong interference immunity of PSS and SSS sequence, can solve the interference problem that many group sequences are being eated dishes without rice or wine.By described terminal called is considered as base station, make the transmission of the reception of the described calling terminal described terminal called that desynchronizes initiatively, thus the reception achieving described calling terminal is synchronous.
Described calling terminal passes through at the synchronous time point of its receiving terminal, carry previous CP and send calling, guarantee that its calling arrives the time error of described terminal called within the scope of a CP, guarantee that described terminal called can complete the data receiving described calling terminal and send.
Fig. 2 is the embodiment of the present invention two, the schematic flow sheet that the terminal called of synchronous method straight-through between a kind of LTE terminal is synchronous.As shown in Figure 2, this synchronous method comprises the following steps:
201, before terminal direct connection, be the unique mark of terminal configuration, and distribute unique PSS and SSS sequence according to mark.
Terminal, be associated completely between terminal iidentification and the combined sequence of PSS and SSS, the combined sequence of PSS and SSS and terminal iidentification are all the differences between terminal.Terminal has unique mark and described PSS and SSS combined sequence.
202, use similar base station to issue the method for PSS and SSS, periodically issue PSS and the SSS sequence of oneself.
Wherein, periodically issuing at terminal fixed resource of described combined sequence, described calling terminal also will according to its periodic receipt.
Optionally, described terminal expands the cycle issuing described PSS and SSS combined sequence, time discrete terminal being issued each other the combined sequence of described PSS and SSS is opened, guarantee that its discrete rule can be derived by the mark of this terminal, that is, described calling terminal, according to the mark of the described terminal called that will call out, can derive the approximate time that this terminal called issues PSS and SSS sequence.Eating dishes without rice or wine to search for again within the time period calculated.Reduce further the interference between described PSS and SSS combined sequence like this.
203, described terminal called receives the signal of described calling terminal, according to the time that described calling terminal signal arrives, calculates the lock in time that described terminal called receives and described calling terminal sends.
Wherein, the calling first of described calling terminal arrives the time error of described terminal called existence less than a CP, time of reception may shift to an earlier date, equally also may be delayed, but its useful signal time is fixed all the time, and receiving-transmitting sides is identical, therefore must have or front or rearly completely fall into receive window, can according to this measurement result, adjustment receives, realize receiving with send between synchronous.
204, calling terminal is considered as base station, oneself is considered as terminal, only oneself time of reception is adjusted, keep the synchronous of receiving terminal and opposite end.
Described terminal called does not carry out any adjustment after transmission.In subsequent communications process, the transmitting portion of oneself is considered as the up of step-out never or forever can not receive the terminal of uplink synchronous notice.
The synchronous method that described terminal called receives and described calling terminal sends that the present embodiment provides, described calling terminal receives on synchronous foundation at it, carry previous CP, also ensure that described terminal called can correctly be resolved, but described terminal called receives with the inclined extent of described calling terminal transmitting time, impact is existed on the antijamming capability in wireless transmission process, therefore, described terminal called receives and described calling terminal send be necessary to realize more accurate synchronous; Described terminal called makes full use of the time that described calling terminal signal arrives described terminal called, realize described terminal called receive and described calling terminal transmission synchronous.
Fig. 3 is the embodiment of the present invention three, the structural representation of the terminal of synchronous method straight-through between a kind of LTE terminal provided.As shown in Figure 3, this terminal comprises: PSS and SSS combined sequence generation module 31, sending module 32, receiver module 33 and reception synchronization module 34.
Wherein, PSS and SSS combined sequence generation module 31, when described terminal is in called state, for calculating PSS and the SSS combined sequence of oneself according to the mark of oneself, and according to the time that oneself will issue, the result notice sending module that oneself is calculated; When described terminal be in caller state will make a call time, the terminal iidentification that described PSS and SSS combined sequence generation module is called out according to this terminal, PSS and the SSS combined sequence of the terminal that calculating will be called out and its delivery time of eating dishes without rice or wine, by the result notice receiver module calculated.
Sending module 32, when described terminal is in called state, for the result calculated by PSS and SSS combined sequence generation module 31, is issued the method for PSS and SSS combined sequence, is issued to and eats dishes without rice or wine by similar base station.When described terminal is in caller state, described sending module 32, according to the result of described synchronization module 34, is carried previous CP and is sent calling to described terminal called.
Receiver module 33, when described terminal is in called state, for receiving the calling that described calling terminal is initiated; When described terminal is in caller state, PSS and the SSS sequence that the terminal that this terminal of reception will be called out issues by receiver module.
Synchronization module 34, when described terminal is in called state, for measuring the time that described calling terminal arrives, and according to the time that it arrives, the reception of adjustment receiver module, the sending module realizing receiver module and opposite end is synchronous; When described terminal is in caller state, it is synchronous that described calling terminal carries out reception according to PSS and the SSS of wanted calling terminal, and its synchronous method is consistent with regulation in 36 serial protocols of 3GPP.
Each functional module of the terminal that the present embodiment provides can be used for performing synchronous method flow process straight-through between LTE terminal shown in above-described embodiment one and embodiment two, refers to the description of embodiment of the method.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. synchronous method straight-through between LTE terminal and a terminal, is characterized in that, comprising:
Directintermination in system distributes unique mark, and described in terminal, mark is corresponding one by one with PSS and the SSS sequence of oneself, and described terminal issues PSS and SSS sequence according to timing cycles;
When calling terminal needs to communicate with other-end, this terminal is by receiving PSS and SSS described in terminal called, and the signal sent realizing self reception and terminal called is synchronous;
Calling terminal sends the synchronous time point of signal at terminal called, carries previous CP and calls out terminal called; Because the distance of terminal direct connection is not far, CP technology is enough to guarantee the information that terminal called is successfully resolved calling terminal and sent, thus realize and signal that calling terminal sends synchronous;
The other side is all considered as base station, the signal that synchronization counterpart sends by follow-up straight-through terminal both sides, and the signal that self sends does not adjust, and achieves time synchronized straight-through between LTE terminal.
2. synchronous method straight-through between LTE terminal according to claim 1, is characterized in that,
In advance for needing straight-through described terminal to arrange unique mark, described terminal obtains unique PSS and SSS combined sequence according to unique mark, comprising:
Described terminal issues the resource delivery method of PSS and SSS with reference to existing base station, issues PSS and SSS in the interface-free resources cycle of correspondence.
3. method synchronous between LTE directintermination according to claim 1, is characterized in that,
When described calling terminal needs to communicate with described terminal called, described PSS and SSS that this calling terminal sends by receiving terminal called, and the signal sent of terminal called is synchronous, comprising:
Described calling terminal is according to the mark of described terminal called, calculate PSS and the SSS sequence of described terminal called, then at PSS and SSS of removal search identical sequence that eat dishes without rice or wine, described calling terminal is according to after receiving PSS and SSS sequence that described terminal called sends, adopt prior art, allow the reception of described calling terminal and described terminal called send and carry out synchronously.
4. synchronous method straight-through between LTE terminal according to claim 1, is characterized in that,
Described calling terminal is sending the synchronous time point of signal with described terminal called, carries previous CP and calls out described terminal called; Because the distance of terminal direct connection is shorter, air interface transmission time delay is no more than a CP, comprising:
Described terminal called successfully can resolve the information of described calling terminal, so realize and the signal that sends of described calling terminal synchronous.
5. synchronous method straight-through between LTE terminal according to claim 1, is characterized in that,
Described calling terminal and described terminal called is follow-up all the other side is considered as base station, comprising: the signal that synchronization counterpart sends, the signal simultaneously self sent does not adjust;
Achieve LTE terminal lead directly between time synchronized.
6. a terminal, is characterized in that, comprising:
Sequence generating module: for the mark according to terminal, generates unique PSS and SSS combined sequence;
Sending module: described terminal periodic sends the sequence of PSS and SSS of self, sequence period sends by described terminal called;
Receiver module: receive described terminal and issue PSS and SSS sequence;
Synchronization module: the information according to receiving Correspondent Node is measured, according to oneself the time of reception of information adjustment measured, realizes the receiver module of oneself and the transmitting of opposite end is carried out synchronously.
7. terminal according to claim 6, it is characterized in that, the mark that described sequence generating module is preset according to directintermination or the mark of terminal that will communicate, obtain the combined sequence of unique PSS and SSS, described combined sequence identifies a terminal uniquely in straight-through system.
8. terminal according to claim 6, is characterized in that, the combined sequence obtained according to claim 7 is adopted the method for similar base station by described sending module, and the running time-frequency resource of PSS and SSS of correspondence issues.
9. terminal according to claim 6, is characterized in that, described receiver module, when as caller, according to the mark of terminal called, calculates and receives called PSS and SSS combined sequence.
10. terminal according to claim 6, is characterized in that, described synchronization module, when doing caller, according to called PSS and SSS, adjusts the receiving terminal of oneself, make the receiving terminal of oneself and called transmitting terminal synchronous; As time called, according to the calling of caller, adjust the receiving terminal of oneself, make the transmitting terminal of oneself receiving terminal and caller synchronous.
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| CN201510189869.XA CN104852880A (en) | 2015-04-21 | 2015-04-21 | Synchronization method and terminal for direct communication between LTE terminal |
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| CN201510189869.XA CN104852880A (en) | 2015-04-21 | 2015-04-21 | Synchronization method and terminal for direct communication between LTE terminal |
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