CN104581755A

CN104581755A - Time synchronization method between direct-communication UE (user equipment) and UE

Info

Publication number: CN104581755A
Application number: CN201310485852.XA
Authority: CN
Inventors: 张维良
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2013-10-16
Filing date: 2013-10-16
Publication date: 2015-04-29
Also published as: WO2015055056A1

Abstract

An embodiment of the invention discloses a time synchronization method between direct-communication UE (user equipment) and UE. The method comprises the steps as follows: when first UE and second UE build a direct-communication link, a configuration parameter sent by a base station is received, wherein the configuration parameter comprises a second time-frequency resource position where the second UE sends a detection signal; a second detection signal sent by the second UE is obtained according to first downlink fixed time between the first UE and the base station; the second detection signal is detected through correlation of the signals to obtain a first time deviation; time synchronization of the first UE and the second UE is performed according to the first time deviation. Data transmitting fixed time of the UE at the transmission end between the direct-communication UE is adjusted through the detection signals between the direct-communication UE so as to keep consistent with data receiving fixed time of the UE at the receiving end, data can be transmitted regularly and synchronously between the direct-communication UE according to adjusted time, the data transmission accuracy between the direct-communication UE is guaranteed and the frequency utilization efficiency of the system is improved.

Description

Method for synchronizing time between straight-through UE and UE

Technical field

The present invention relates to communication technical field, the method for synchronizing time particularly between direct user equipment (User Equipment, UE) and UE.

Background technology

Wireless communication technology obtains huge development in recent years, and existing conventional cordless communication network comprises cellular network.In cellular networks, when transmitting packet between the UE that two transmission ranges are far away, this packets need is transferred to base station from the UE that makes a start, then from base-station transmission to receiving end UE, above-mentioned transmitting procedure needs to take twice interface-free resources.When between two UE, transmission range is nearer, in order to save air interface transmission resource, reduce the expense of base station control signal, device-to-device (Device to Device can be passed through, D2D) mode communicates, i.e. direct communication between UE, and forward without the need to base station, the UE of direct communication is called straight-through UE.

Inventor finds in the research process of prior art, when communicating between UE with base station, in order to realize the time synchronized between UE and base station, offset whole order when being issued to UE by base station unification, UE according to time offset whole order adjustment send timing, to carry out uplink synchronous with base station, and send upstream data according to the transmission timing after adjustment to base station; But, due to cannot time synchronizing method between direct multiplexing existing UE and base station between straight-through UE, when therefore transmitting data between straight-through UE, may because time irreversibility, cause being difficult to receiving the data that opposite end UE directly transmits.

Summary of the invention

Provide the method for synchronizing time between straight-through UE and UE in the embodiment of the present invention, in prior art, between straight-through UE, be difficult to carry out the problem of time synchronized to solve.

In order to solve the problems of the technologies described above, the embodiment of the invention discloses following technical scheme:

First aspect, provide the method for synchronizing time between a kind of straight-through UE, described method comprises:

When setting up straight-through link between the one UE and the 2nd UE, receive the configuration parameter that base station sends, described configuration parameter comprises the second running time-frequency resource position that described 2nd UE sends detectable signal;

The second detectable signal that a described UE sends according to the 2nd UE described in the descending timing acquisition of first between described base station, described second detectable signal be described 2nd UE in described second running time-frequency resource position, according to the detectable signal of the up timed sending of second between described base station;

A described UE detects described second detectable signal by signal correlation, and obtain very first time deviation, described very first time deviation is the time deviation between described second up timing and described first descending timing;

A described UE carries out time synchronized according to described very first time deviation and described 2nd UE, consistent with the data receiver timing of described 2nd UE to make the data of a described UE send timing.

In conjunction with first aspect, in the first possible implementation of first aspect, described configuration parameter also comprises the first running time-frequency resource position that a described UE sends detectable signal;

After the configuration parameter that described reception base station sends, described method also comprises: described configuration parameter also comprises the first running time-frequency resource position that a described UE sends detectable signal.

In conjunction with in the first possible implementation of first aspect, in the implementation that the second of first aspect is possible, a described UE carries out time synchronized according to described very first time deviation and described 2nd UE, comprising:

A described UE calculates described first up timing and the difference of described very first time deviation, described difference is defined as the first up timing after upgrading;

The 4th detectable signal that a described UE sends according to the 2nd UE described in described first descending timing acquisition, described 4th detectable signal is that described 2nd UE is in described second running time-frequency resource position, according to the detectable signal of the second up timed sending after upgrading, the after described renewal second up timing is described second up timing and the difference of described second time deviation;

A described UE detects described 4th detectable signal by signal correlation, obtains the 3rd time deviation, and described 3rd time deviation is the second up timing after described renewal and the time deviation between described first descending timing;

Difference between up for after described renewal first timing and described 3rd time deviation is defined as the time synchronized timing between a described UE and the 2nd UE by a described UE.

In conjunction with the implementation that the second of first aspect is possible, in the third possible implementation of first aspect, described method also comprises:

A described UE is in described first running time-frequency resource position, according to the up timed sending of first after described renewal the 3rd detectable signal, to make described 2nd UE according to after the 3rd detectable signal described in described second descending timing acquisition, described 3rd detectable signal is detected by signal correlation, obtain the 4th time deviation, and the time synchronized timing difference between up for second after described renewal timing and described 4th time deviation is defined as between described 2nd UE and a described UE, described 4th time deviation is the first up timing after described renewal and the time deviation between described second descending timing,

After a described UE obtains described 3rd time deviation, send first of the described UE entry time synchronous regime of instruction to described 2nd UE synchronously to indicate, and receive described 2nd UE and obtain after described 4th time deviation, second of the described 2nd UE entry time synchronous regime of instruction sent to a described UE synchronously indicates.

In conjunction with the first possible implementation of first aspect, in the 4th kind of possible implementation of first aspect, a described UE carries out time synchronized according to described very first time deviation and described 2nd UE, comprising:

Described very first time deviation is reported to described base station by a described UE, to make described base station that described very first time deviation is transmitted to described 2nd UE, the time synchronized timing of described very first time deviation for making described 2nd UE the difference between described second up timing and described very first time deviation be defined as between described 2nd UE and a described UE;

A described UE receives first of described base station transmission and has configured message, described first to have configured message be described 2nd UE send confirm to receive the acknowledge message of described very first time deviation to described base station after, sent to the message of a described UE by base station; And,

A described UE receives the second time deviation that described base station forwards, and described second time deviation is the time deviation that described 2nd UE reports to described base station;

A described UE sends the acknowledge message confirming to receive described second time deviation to described base station, send second configured message to make described base station to described 2nd UE;

Difference between described first up timing and described second time deviation is defined as the time synchronized timing between a described UE and described 2nd UE by a described UE.

In conjunction with the third possible implementation of first aspect, or the 4th of first aspect the kind of possible implementation, in the 5th kind of possible implementation of first aspect, after a described UE carries out time synchronized according to described very first time deviation and described 2nd UE, described method also comprises:

A described UE sends data according to the time synchronized timing between a described UE and the 2nd UE to described 2nd UE;

A described UE receives the data that described 2nd UE sends to a described UE according to the time timing between a described 2nd UE and UE.

Second aspect, provides a kind of UE, and described UE, as the UE between straight-through UE, comprising:

Dispensing unit, during for setting up straight-through link between a described UE and the 2nd UE, receives the configuration parameter that base station sends, and described configuration parameter comprises the second running time-frequency resource position that described 2nd UE sends detectable signal;

Acquiring unit, for the second detectable signal sent according to the 2nd UE described in the first descending timing acquisition between a described UE and described base station, described second detectable signal be described 2nd UE in described running time-frequency resource position, according to the detectable signal of the up timed sending of second between described base station;

Detecting unit, for being detected described second detectable signal that described acquiring unit gets by signal correlation, obtain very first time deviation, described very first time deviation is the time deviation between described second up timing and described first descending timing;

Lock unit, carries out time synchronized for the described very first time deviation that obtains according to described detecting unit and described 2nd UE, consistent with the data receiver timing of described 2nd UE to make the data of a described UE send timing.

In conjunction with second aspect, in the first possible implementation of second aspect, the configuration parameter that described dispensing unit receives also comprises the first running time-frequency resource position that a described UE sends detectable signal;

Described UE also comprises:

Transmitting element, for receive at described dispensing unit base station send configuration parameter after, in described first running time-frequency resource position, according to up timed sending first detectable signal of first between a described UE and described base station, to make described 2nd UE according to after the first detectable signal described in the descending timing acquisition of second between described base station, described first detectable signal is detected by signal correlation, obtain the second time deviation, and carry out time synchronized according to described second time deviation and a described UE, consistent with the data receiver timing of a described UE to make the data of described 2nd UE send timing, wherein, described second time deviation is the time deviation between described first up timing and described second descending timing.

In conjunction with in the first possible implementation of second aspect, in the implementation that the second of second aspect is possible, described lock unit comprises:

Mathematic interpolation subelement, for calculating the difference of the very first time deviation that described first up timing obtains with described detecting unit, is defined as the first up timing after upgrading by described difference;

Transmitting element, for receive at described dispensing unit base station send configuration parameter after, in described first running time-frequency resource position, according to up timed sending first detectable signal of first between a described UE and described base station, to make described 2nd UE according to after the first detectable signal described in the descending timing acquisition of second between described base station, described first detectable signal is detected by signal correlation, obtain the second time deviation, and carry out time synchronized according to described second time deviation and a described UE, consistent with the data receiver timing of a described UE to make the data of described 2nd UE send timing, wherein, described second time deviation is the time deviation between described first up timing and described second descending timing,

Separate-blas estimation subelement, for being detected described 4th detectable signal that described signal acquisition subelement gets by signal correlation, obtain the 3rd time deviation, described 3rd time deviation is the second up timing after described renewal and the time deviation between described first descending timing;

The very first time synchronous subelement, is defined as the time synchronized timing between a described UE and the 2nd UE for the difference between described 3rd time deviation that the first up timing after the described renewal determined by described mathematic interpolation subelement and described separate-blas estimation subelement obtain.

In conjunction with the implementation that the second of second aspect is possible, in the third possible implementation of second aspect, described lock unit also comprises:

Signal sends subelement, for in described first running time-frequency resource position, the first up timed sending the 3rd detectable signal after the described renewal determined according to described mathematic interpolation subelement, to make described 2nd UE according to after the 3rd detectable signal described in described second descending timing acquisition, described 3rd detectable signal is detected by signal correlation, obtain the 4th time deviation, and the time synchronized timing difference between up for second after described renewal timing and described 4th time deviation is defined as between described 2nd UE and a described UE, described 4th time deviation is the first up timing after described renewal and the time deviation between described second descending timing,

Instruction sends subelement, after obtaining described 3rd time deviation, sends first of the described UE entry time synchronous regime of instruction synchronously indicate to described 2nd UE for described separate-blas estimation subelement;

Instruction receives subelement, obtains after described 4th time deviation for receiving described 2nd UE, and second of the described 2nd UE entry time synchronous regime of instruction sent to a described UE synchronously indicates.

In conjunction with the first possible implementation of second aspect, in the 4th kind of possible implementation of second aspect, described lock unit also comprises:

Signal sends subelement, for in the subframe of described first pointer instruction, the first up timed sending the 3rd detectable signal after the described renewal determined according to described mathematic interpolation subelement, to make described 2nd UE according to after the 3rd detectable signal described in described second descending timing receipt, the 4th time deviation is obtained by the correlation detecting described 3rd detectable signal, and the time synchronized timing difference between up for second after described renewal timing and described 4th time deviation is defined as between described 2nd UE and a described UE, described 4th time deviation is the time deviation that a described UE sends between time of reception that the transmitting time of described 3rd detectable signal and described 2nd UE receive described 3rd detectable signal,

In conjunction with the third possible implementation of second aspect, or the 4th of second aspect the kind of possible implementation, in the 5th kind of possible implementation of second aspect, described UE also comprises:

Transmission unit, for sending data according to the time synchronized timing between a described UE and the 2nd UE to described 2nd UE, and receives the data that described 2nd UE regularly sends to a described UE according to the time between a described 2nd UE and UE.

The third aspect, provides a kind of UE, and described UE, as the UE between straight-through UE, comprising: radio receiving-transmitting unit and processor, wherein,

Described radio receiving-transmitting unit, during for setting up straight-through link between a described UE and the 2nd UE, receive the configuration parameter that base station sends, described configuration parameter comprises the second running time-frequency resource position that described 2nd UE sends detectable signal, and according to the second detectable signal that the 2nd UE described in the first descending timing acquisition between a described UE and described base station sends, described second detectable signal be described 2nd UE in described second running time-frequency resource position, according to the detectable signal of the up timed sending of second between described base station;

Described processor, for being detected described second detectable signal by signal correlation, obtain very first time deviation, and carry out time synchronized according to described very first time deviation and described 2nd UE, consistent with the data receiver timing of described 2nd UE to make the data of a described UE send timing, wherein, described very first time deviation is the time deviation between described second up timing and described first descending timing.

In conjunction with the third aspect, in the first possible implementation of the third aspect, described radio receiving-transmitting unit receives configuration parameter and also comprises the first running time-frequency resource position that a described UE sends detectable signal;

Described radio receiving-transmitting unit, also in described first running time-frequency resource position, according to up timed sending first detectable signal of first between a described UE and described base station, to make described 2nd UE according to after the first detectable signal described in the descending timing acquisition of second between described base station, described first detectable signal is detected by signal correlation, obtain the second time deviation, and carry out time synchronized according to described second time deviation and a described UE, consistent with the data receiver timing of a described UE to make the data of described 2nd UE send timing, wherein, described second time deviation is the time deviation between described first up timing and described second descending timing.

In conjunction with in the first possible implementation of the third aspect, in the implementation that the second of the third aspect is possible, described processor, specifically for calculating the difference of described first up timing and described very first time deviation, described difference is defined as the first up timing after upgrading, by the 4th detectable signal that described radio receiving-transmitting unit sends according to the 2nd UE described in described first descending timing acquisition, described 4th detectable signal is that described 2nd UE is in described second running time-frequency resource position, according to the detectable signal of the second up timed sending after renewal, after described renewal second up timing is described second up timing and the difference of described second time deviation, described 4th detectable signal is detected by signal correlation, obtain the 3rd time deviation, described 3rd time deviation is the second up timing after described renewal and the time deviation between described first descending timing, and the time synchronized timing difference between up for first after described renewal timing and described 3rd time deviation is defined as between a described UE and the 2nd UE.

In conjunction with the implementation that the second of the third aspect is possible, in the third possible implementation of the third aspect, described radio receiving-transmitting unit, also in described first running time-frequency resource position, according to the up timed sending of first after described renewal the 3rd detectable signal, to make described 2nd UE according to after the 3rd detectable signal described in described second descending timing acquisition, described 3rd detectable signal is detected by signal correlation, obtain the 4th time deviation, and the time synchronized timing difference between up for second after described renewal timing and described 4th time deviation is defined as between described 2nd UE and a described UE, described 4th time deviation is the first up timing after described renewal and the time deviation between described second descending timing, and, after obtaining described 3rd time deviation, send first of the described UE entry time synchronous regime of instruction to described 2nd UE synchronously to indicate, and receive described 2nd UE and obtain after described 4th time deviation, second of the described 2nd UE entry time synchronous regime of instruction sent to a described UE synchronously indicates.

In conjunction with the first possible implementation of the third aspect, in the 4th kind of possible implementation of the third aspect, described radio receiving-transmitting unit, also for described very first time deviation is reported to described base station, to make described base station that described very first time deviation is transmitted to described 2nd UE, the time synchronized timing of described very first time deviation for making described 2nd UE the difference between described second up timing and described very first time deviation be defined as between described 2nd UE and a described UE; What receive that described base station sends first configure message, and described first configure message be, after described 2nd UE receives the acknowledge message of described very first time deviation to the transmission confirmation of described base station, sent to the message of a described UE by base station; And receive the second time deviation that described base station forwards, described second time deviation is the time deviation that described 2nd UE reports to described base station; Send the acknowledge message confirming to receive described second time deviation to described base station, send second to make described base station to described 2nd UE and configured message;

Described processor, specifically for being defined as the time synchronized timing between a described UE and described 2nd UE by the difference between described first up timing and described second time deviation.

In conjunction with the third possible implementation of the third aspect, or the 4th of the third aspect the kind of possible implementation, in the 5th kind of possible implementation of the third aspect, described radio receiving-transmitting unit, also for sending data according to the time synchronized timing between a described UE and the 2nd UE to described 2nd UE; Receive the data that described 2nd UE sends to a described UE according to the time timing between a described 2nd UE and UE.

In the embodiment of the present invention, when setting up straight-through link between the one UE and the 2nd UE, receive the configuration parameter comprising the second running time-frequency resource position of the 2nd UE transmission detectable signal that base station sends, according to the second detectable signal that the descending timing acquisition of first between base station the 2nd UE sends, the second detectable signal is detected by signal correlation, obtain the very first time deviation between the second up timing and described first descending timing, time synchronized is carried out according to very first time deviation and the 2nd UE, consistent with the data receiver timing of the 2nd UE to make the data of a UE send timing.The application embodiment of the present invention, can by the detectable signal between straight-through UE, the data of UE of making a start between the straight-through UE of adjustment send timing, the timing of the data receiver of itself and receiving end UE is consistent, thus make between straight-through UE can according to the time synchronized timing transmission data after adjustment, ensure that the accuracy of transfer of data between straight-through UE, improve the efficiency of frequency employment of system.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, for those of ordinary skills, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the embodiment flow chart that the timing synchronous method between UE is led directly in the present invention;

Fig. 2 is another embodiment flow chart that the time time synchronization method between UE is led directly in the present invention;

Fig. 3 is another embodiment flow chart that the time time synchronization method between UE is led directly in the present invention;

Fig. 4 is an embodiment block diagram of UE of the present invention;

Fig. 5 is another embodiment block diagram of UE of the present invention;

Fig. 6 is another embodiment block diagram of UE of the present invention.

Embodiment

Technical scheme in the embodiment of the present invention is understood better in order to make those skilled in the art person, and enable the above-mentioned purpose of the embodiment of the present invention, feature and advantage become apparent more, below in conjunction with accompanying drawing, technical scheme in the embodiment of the present invention is described in further detail.

See Fig. 1, for an embodiment flow chart of the method for synchronizing time between UE is led directly in the present invention, this embodiment is described from a UE side of carrying out D2D communication:

Step 101: when setting up straight-through link between a UE and the 2nd UE, receives the configuration parameter that base station sends, and this configuration parameter comprises the second running time-frequency resource position that the 2nd UE sends detectable signal.

In the present embodiment, a UE and the 2nd UE carry out the straight-through UE that D2D communicates, and when setting up straight-through link between a UE and the 2nd UE, base station sends configuration parameter respectively to a UE and the 2nd UE.Wherein, base station includes the second running time-frequency resource position that the 2nd UE sends detectable signal, so that the detectable signal that a UE can send at the second running time-frequency resource position acquisition the 2nd UE according to this configuration parameter to the configuration parameter that a UE sends.Further, this configuration parameter can also comprise the first running time-frequency resource position that a UE sends detectable signal, so that a UE according to this configuration parameter, can send detectable signal in the first running time-frequency resource position.

Step 102: the second detectable signal that a UE sends according to the descending timing acquisition of first between base station the 2nd UE, this second detectable signal be the 2nd UE in the second running time-frequency resource position, according to the detectable signal of the up timed sending of second between base station.

In the present embodiment, one UE and the 2nd UE can respectively according to existing mode with carry out between base station synchronous, wherein obtain the first up timing and the first descending timing after a UE and base station synchronization, after the 2nd UE and base station synchronization, obtain the second up timing and the second descending timing.One UE is according to the first up timed sending first detectable signal, and according to the second detectable signal that the first descending timing acquisition the 2nd UE sends, accordingly, 2nd UE according to the second up timed sending second detectable signal, and according to second descending timing acquisition the one UE send the first detectable signal.

Wherein, the first running time-frequency resource position in abovementioned steps 101 indicates the subframe that a UE sends detectable signal, in this step first up timing specifically refers to that a UE which millisecond in the subframe sending detectable signal sends this detectable signal, and in like manner the second up timing specifically refers to that the 2nd UE which millisecond in the subframe sending detectable signal sends this detectable signal.

Step 103 a: UE detects the second detectable signal by signal correlation, obtain very first time deviation, this very first time deviation is the time deviation between the second up timing and the first descending timing.

When after the second detectable signal that a UE sends to the 2nd UE according to the first descending timing acquisition, the second detectable signal is detected by signal correlation, obtain very first time deviation, this very first time deviation is the time deviation that the 2nd UE sends between the first descending timing that the second up timing of the second detectable signal and a UE obtain the second detectable signal.In like manner, after the first detectable signal that 2nd UE sends to a UE according to the second descending timing acquisition, the first detectable signal is detected by signal correlation, obtain the second time deviation, this second time deviation is the time deviation that a UE sends between the second descending timing that the up timing of the first detectable signal and the 2nd UE obtain the first detectable signal.

Wherein, one UE is when detecting the second detectable signal by signal correlation, due to the first descending timing of UE known acquisition second detectable signal, and the 2nd UE send the second running time-frequency resource position pin of the second detectable signal, therefore very first time deviation can be obtained according to existing signal correlation detection mode, 2nd UE detect the process of the first detectable signal by signal correlation and a UE similar, do not repeat them here.

Step 104 a: UE carries out time synchronized according to very first time deviation and the 2nd UE is consistent with the data receiver timing of the 2nd UE to make the data of a UE send timing.

In an optional implementation: a UE can calculate the difference of the first up timing and described very first time deviation, difference is defined as the first up timing after upgrading, according to the 4th detectable signal that the first descending timing acquisition the 2nd UE sends, 4th detectable signal is that the 2nd UE is in described second running time-frequency resource position, according to the detectable signal of the second up timed sending after upgrading, the after renewal second up timing is the second up timing and the difference of described second time deviation; One UE detects the 4th detectable signal by signal correlation, obtain the 3rd time deviation, 3rd time deviation be upgrade after the second up timing and described first descending timing between time deviation, by upgrade after the first up timing and the 3rd time deviation between difference be defined as between a UE and the 2nd UE time synchronized timing.

In another optional implementation: very first time deviation can be reported to base station by a UE, very first time deviation is transmitted to the 2nd UE by base station, the time synchronized timing difference between the second up timing and very first time deviation being defined as between the 2nd UE and a UE to make the 2nd UE; What the one UE received that base station sends first configure message, and first configure message be, after the 2nd UE receives the acknowledge message of very first time deviation to base station transmission confirmation, sent to the message of a UE by base station; And, one UE receives the second time deviation that base station forwards, second time deviation is the time deviation that the 2nd UE reports to described base station, the acknowledge message confirming to receive the second time deviation is sent to base station, send second to make base station to the 2nd UE and configured message, the difference between the first up timing and the second time deviation is defined as the time synchronized timing between a UE and the 2nd UE by a UE.

When a UE determines the time synchronized timing between a UE and the 2nd UE, namely the data of a UE send regularly consistent with the data receiver timing of the 2nd UE, and the 2nd UE determine between the 2nd UE and a UE time synchronized timing, namely the data of the 2nd UE send timing consistent with the timing of the data receiver of a UE after, one UE sends data according to the time synchronized timing between a described UE and the 2nd UE to the 2nd UE, and receive the 2nd UE according to the data that send to a UE of time timing between the 2nd UE and a UE, in like manner, 2nd UE sends data according to the time synchronized timing between a described 2nd UE and UE to a UE, and accept a UE according to the data that send to the 2nd UE of time timing between a UE and the 2nd UE.

As seen from the above-described embodiment, this embodiment can by the detectable signal between straight-through UE, the data of UE of making a start between the straight-through UE of adjustment send timing, the timing of the data receiver of itself and receiving end UE is consistent, thus make between straight-through UE can according to the time synchronized timing transmission data after adjustment, ensure that the accuracy of transfer of data between straight-through UE, improve the efficiency of frequency employment of system.

See Fig. 2, for another embodiment flow chart of the method for synchronizing time between UE is led directly in the present invention, this example show the process of carrying out passing through to carry out alternately time synchronized between a UE of D2D communication and the 2nd UE:

When step 201a:UE1 and UE2 sets up straight-through link, base station sends configuration parameter to UE1, and this configuration parameter comprises the configuration parameter that UE1 sends detectable signal, and UE1 for detect UE2 send the configuration parameter of detectable signal.

Wherein, the configuration parameter that UE1 sends detectable signal can comprise: UE1 sends the first running time-frequency resource position of detectable signal, and this first running time-frequency resource position includes the subframe that UE1 sends detectable signal; UE1 for detect UE2 send detectable signal configuration parameter can comprise: UE2 sends the second running time-frequency resource position of detectable signal, and this second running time-frequency resource position includes the subframe that UE2 sends detectable signal.

When step 201b:UE2 and UE1 sets up straight-through link, base station sends configuration parameter to UE2, and this configuration parameter comprises the configuration parameter that UE2 sends detectable signal, and UE2 for detect UE1 send the configuration parameter of detectable signal.

Wherein, the configuration parameter that UE2 sends detectable signal can comprise: UE2 sends the second running time-frequency resource position of detectable signal, and this second running time-frequency resource position includes the subframe that UE2 sends detectable signal; UE2 for detect UE1 send detectable signal configuration parameter can comprise: UE1 sends the first running time-frequency resource position of detectable signal, and this first running time-frequency resource position includes the subframe that UE1 sends detectable signal.

Step 202a:UE1 is according to the up timed sending first of first between base station detectable signal.

UE1 can carry out uplink synchronous according between existing mode and base station, obtains the first up timing, and sends detectable signal (beacon) according to the first up timed sending first.Wherein, the first running time-frequency resource position in abovementioned steps includes the subframe that UE1 sends detectable signal, and the in this step first up timing refers to that UE1 which millisecond in the subframe sending detectable signal sends this detectable signal.

Step 202b:UE2 is according to the up timed sending second of second between base station detectable signal.

UE2 can carry out uplink synchronous according between existing mode and base station, obtains the second up timing, and according to the second up timed sending second detectable signal (beacon).Wherein, the second running time-frequency resource position in abovementioned steps includes the subframe that UE2 sends detectable signal, and the in this step second up timing mainly refers to that UE2 which millisecond in the subframe sending detectable signal sends this detectable signal.

The second detectable signal that step 203a:UE1 sends according to the descending timing acquisition UE2 of first between base station, and detect the second detectable signal by signal correlation, obtain very first time deviation delta1.

UE1 can carry out down-going synchronous according between existing mode and base station, obtain the first descending timing, when after the second detectable signal sent to UE2 according to the first descending timing acquisition, this the second detectable signal is detected by signal correlation, obtaining very first time deviation delta1, this very first time deviation delta1 is the time deviation that UE2 sends between the first descending timing that the second up timing of the second detectable signal and UE1 obtain the second detectable signal.

Wherein, when detecting the second detectable signal by signal correlation, due to the first descending timing of UE1 known acquisition second detectable signal, and UE2 sends the second running time-frequency resource position of the second detectable signal, therefore can obtain very first time deviation delta1 according to existing correlation detection mode, concrete correlation detection process the present embodiment repeats no more.

The first detectable signal that step 203b:UE2 sends according to the descending timing acquisition UE1 of second between base station, and detect the first detectable signal by signal correlation, obtain the second time deviation delta2.

UE2 can carry out down-going synchronous according between existing mode and base station, obtain the second descending timing, when after the first detectable signal sent to UE1 according to the second descending timing acquisition, this the first detectable signal is detected by signal correlation, obtain the second time deviation delta2, this second time deviation delta2 is the time deviation that UE1 sends between the second descending timing that the first up timing of the first detectable signal and UE2 obtain the first detectable signal.

Wherein, when detecting the first detectable signal by signal correlation, due to the descending timing of UE2 known acquisition first detectable signal second, and UE1 sends the first running time-frequency resource position of the second detectable signal, therefore can obtain the second time deviation delta2 according to existing correlation detection mode, concrete correlation detection process the present embodiment repeats no more.

Step 204a:UE1 sends the 3rd detectable signal according to very first time deviation delta1.

After UE1 obtains very first time deviation delta1, calculate the difference of the first up timing and very first time deviation delta1, using this difference as the first up timing after renewal, and in the first running time-frequency resource position, according to the first up timed sending the 3rd detectable signal after renewal.

Step 204b:UE2 sends the 4th detectable signal according to the second time deviation delta2.

After UE2 obtains the second time deviation delta2, calculate the difference of the second up timing and the second time deviation delta2, using this difference as the second up timing after renewal, and in the second running time-frequency resource position, according to the second up timed sending the 4th detectable signal after renewal.

Step 205a:UE1 according to the first descending timing acquisition the 4th detectable signal, and detects the 4th detectable signal by signal correlation, obtains the 3rd time deviation delta3.

In this step, UE1 detects the 4th detectable signal by signal correlation and obtains UE1 in the process of the 3rd time deviation delta3 and abovementioned steps 203a to obtain the process of very first time deviation delta1 similar, does not repeat them here.

Step 205b:UE2 according to the second descending timing acquisition the 3rd detectable signal, and detects the 3rd detectable signal by signal correlation, obtains the 4th time deviation delta4.

In this step, UE2 detects the 3rd detectable signal by signal correlation and obtains UE2 in the process of the 4th time deviation delta4 and abovementioned steps 203b to obtain the process of the second time deviation delta2 similar, does not repeat them here.

After step 206a:UE1 determines entry time synchronous regime, send first to UE2 and synchronously indicate.

After UE1 obtains the 3rd time deviation delta3, determine entry time synchronous regime, now UE1 sends to UE2 and indicates first of UE1 entry time synchronous regime synchronously to indicate.

After step 206b:UE2 determines entry time synchronous regime, send second to UE1 and synchronously indicate.

After UE2 obtains the 4th time deviation delta4, determine entry time synchronous regime, now UE2 sends to UE1 and indicates second of UE2 entry time synchronous regime synchronously to indicate.

Step 207a:UE1 obtains the time synchronized timing of straight-through link between UE2 according to the 3rd time deviation delta3, and sends data according to this time synchronized timing to UE2.

Difference between up for after the renewal obtained in step 204a first timing and the 3rd time deviation delta3 is defined as the time synchronized timing between UE1 and UE2 by UE1, now the data of UE1 send regularly consistent with the data receiver timing of UE2, and follow-up UE1 sends data according to this time synchronized timing to UE2.

Step 207b:UE2 obtains the time synchronized timing of straight-through link between UE1 according to the 4th time deviation delta4, and sends data according to this time synchronized timing to UE1.

Difference between up for after the renewal obtained in step 204b second timing and the 4th time deviation delta4 is defined as the time synchronized timing between UE2 and UE1 by UE2, now the data of UE2 send regularly consistent with the data receiver timing of UE1, and follow-up UE2 sends data according to this time synchronized timing to UE1.

Between step 208:UE1 and UE2, the follow-up timing cycle according to base station configuration repeats the timing synchronization procedure of aforementioned straight-through link.

See Fig. 3, for another embodiment flow chart of the method for synchronizing time between UE is led directly in the present invention, this example show the process of carrying out being carried out time synchronized between a UE of D2D communication and the 2nd UE by base station:

When step 301a:UE1 and UE2 sets up straight-through link, base station sends configuration parameter to UE1, and this configuration parameter comprises the configuration parameter that UE1 sends detectable signal, and UE1 for detect UE2 send the configuration parameter of detectable signal.

When step 301b:UE2 and UE1 sets up straight-through link, base station sends configuration parameter to UE2, and this configuration parameter comprises the configuration parameter that UE2 sends detectable signal, and UE2 for detect UE1 send the configuration parameter of detectable signal.

Step 302a:UE1 is according to the up timed sending first of first between base station detectable signal.

Step 302b:UE2 is according to the up timed sending second of second between base station detectable signal.

The second detectable signal that step 303a:UE1 sends according to the descending timing acquisition UE2 of first between base station, and detect the second detectable signal by signal correlation, obtain very first time deviation delta1.

The first detectable signal that step 303b:UE2 sends according to the descending timing acquisition UE1 of second between base station, and detect the first detectable signal by signal correlation, obtain the second time deviation delta2.

Step 304a:UE1 reports very first time deviation delta1 to base station.

Step 304b:UE2 reports the second time deviation delta2 to base station.

Step 305a: the very first time deviation delta1 of UE1 is transmitted to UE2 by base station.

Step 305b: the second time deviation delta2 of UE2 is transmitted to UE1 by base station.

Step 306a:UE1 sends the acknowledge message confirming to receive the second time deviation delta2 to base station.

Step 306b:UE2 sends the acknowledge message confirming to receive very first time deviation delta1 to base station.

Step 307a: after base station receives the acknowledge message of UE2 transmission, sends first to UE1 and has configured message.

Step 307b: after base station receives the acknowledge message of UE1 transmission, sends second to UE2 and has configured message.

Step 308a:UE1 receives after the first configuration completes message, confirms entry time synchronous regime between UE2.

Step 308b:UE2 receives after the second configuration completes message, confirms entry time synchronous regime between UE1.

Step 309a:UE1 obtains the time synchronized timing of straight-through link between UE2 according to the second time deviation delta2, and sends data according to this time synchronized timing to UE2.

The difference of the first up timing and the second time deviation delta2 is defined as the time synchronized of straight-through link between UE1 and UE2 regularly by UE1, now the data of UE1 send regularly consistent with the data receiver timing of UE2, and follow-up UE1 sends data according to this time synchronized timing to UE2.

Step 309b:UE2 obtains the time synchronized timing of straight-through link between UE1 according to very first time deviation delta1, and sends data according to this time synchronized timing to UE1.

The difference of the second up timing and very first time deviation delta1 is defined as the time synchronized of straight-through link between UE2 and UE1 regularly by UE2, now the data of UE2 send regularly consistent with the data receiver timing of UE1, and follow-up UE2 sends data according to this time synchronized timing to UE1.

Between step 310:UE1 and UE2, the follow-up timing cycle according to base station configuration repeats the timing synchronization procedure of aforementioned straight-through link.

Corresponding with the embodiment that the method for synchronizing time between UE is led directly in the present invention, present invention also offers the embodiment of UE.

See Fig. 4, an embodiment block diagram for UE of the present invention:

This UE comprises: dispensing unit 410, acquiring unit 420, detecting unit 430 and lock unit 440.

Wherein, dispensing unit 410, during for setting up straight-through link between a described UE and the 2nd UE, receives the configuration parameter that base station sends, and described configuration parameter comprises the second running time-frequency resource position that described 2nd UE sends detectable signal;

Acquiring unit 420, for the second detectable signal sent according to the 2nd UE described in the first descending timing acquisition between a described UE and described base station, described second detectable signal be described 2nd UE in described running time-frequency resource position, according to the detectable signal of the up timed sending of second between described base station;

Detecting unit 430, for being detected described second detectable signal that described acquiring unit 420 gets by signal correlation, obtain very first time deviation, described very first time deviation is the time deviation between described second up timing and described first descending timing;

Lock unit 440, carries out time synchronized for very first time deviation and described 2nd UE obtained according to described detecting unit 430, regularly consistent with the data receiver of described 2nd UE to make the data of a described UE send timing.

See Fig. 5, another embodiment block diagram for UE of the present invention:

This UE comprises: dispensing unit 510, transmitting element 520, acquiring unit 530, detecting unit 540 and lock unit 550.

Wherein, dispensing unit 510, during for setting up straight-through link between a described UE and the 2nd UE, receive the configuration parameter that base station sends, described configuration parameter comprises the second running time-frequency resource position that described 2nd UE sends detectable signal, and a described UE sends the first running time-frequency resource position of detectable signal;

Transmitting element 520, for in described first running time-frequency resource position, according to up timed sending first detectable signal of first between a described UE and described base station, to make described 2nd UE according to after the first detectable signal described in the descending timing acquisition of second between described base station, described first detectable signal is detected by signal correlation, obtain the second time deviation, and carry out time synchronized according to described second time deviation and a described UE, consistent with the data receiver timing of a described UE to make the data of described 2nd UE send timing, wherein, described second time deviation is the time deviation between described first up timing and described second descending timing,

Acquiring unit 530, for the second detectable signal sent according to the 2nd UE described in the first descending timing acquisition between a described UE and described base station, described second detectable signal be described 2nd UE in described running time-frequency resource position, according to the detectable signal of the up timed sending of second between described base station;

Detecting unit 540, for being detected described second detectable signal that described acquiring unit 530 gets by signal correlation, obtain very first time deviation, described very first time deviation is the time deviation between described second up timing and described first descending timing;

Lock unit 550, carries out time synchronized for very first time deviation and described 2nd UE obtained according to described detecting unit 540, regularly consistent with the data receiver of described 2nd UE to make the data of a described UE send timing.

In an optional implementation:

Described lock unit 550 can comprise (not shown in Fig. 5):

Signal acquisition subelement, for the 4th detectable signal sent according to the 2nd UE described in described first descending timing acquisition, described 4th detectable signal is that described 2nd UE is in described second running time-frequency resource position, according to the detectable signal of the second up timed sending after upgrading, the after described renewal second up timing is described second up timing and the difference of described second time deviation;

Further, described lock unit 550 can also comprise:

In another optional implementation:

Described lock unit 550 can comprise (not shown in Fig. 5):

Deviation reports subelement, described very first time deviation for being obtained by described detecting unit reports to described base station, to make described base station that described very first time deviation is transmitted to described 2nd UE, the time synchronized timing of described very first time deviation for making described 2nd UE the difference between described second up timing and described very first time deviation be defined as between described 2nd UE and a described UE;

Message sink subelement, send for receiving described base station first has configured message, described first to have configured message be described 2nd UE send confirm to receive the acknowledge message of described very first time deviation to described base station after, sent to the message of a described UE by base station;

Deviation receives subelement, and for receiving the second time deviation that described base station forwards, described second time deviation is the time deviation that described 2nd UE reports to described base station;

Message sends subelement, confirming that described deviation receives the acknowledge message that subelement receives described second time deviation, sending second configured message to make described base station to described 2nd UE for sending to described base station;

Second time synchronized subelement, is defined as the time synchronized timing between a described UE and described 2nd UE for the difference described first up timing and described deviation received between described second time deviation that subelement receives.

In another optional implementation:

Described UE can also comprise (not shown in Fig. 5): transmission unit, for sending data according to the time synchronized timing between a described UE and the 2nd UE to described 2nd UE, and receive the data that described 2nd UE regularly sends to a described UE according to the time between a described 2nd UE and UE.

See Fig. 6, another embodiment block diagram for UE of the present invention:

This UE comprises: radio receiving-transmitting unit 610 and processor 620.

Wherein, described radio receiving-transmitting unit 610, during for setting up straight-through link between a described UE and the 2nd UE, receive the configuration parameter that base station sends, described configuration parameter comprises the second running time-frequency resource position that described 2nd UE sends detectable signal, and according to the second detectable signal that the 2nd UE described in the first descending timing acquisition between a described UE and described base station sends, described second detectable signal be described 2nd UE in described second running time-frequency resource position, according to the detectable signal of the up timed sending of second between described base station;

Described processor 620, for being detected described second detectable signal by signal correlation, obtain very first time deviation, and carry out time synchronized according to described very first time deviation and described 2nd UE, consistent with the data receiver timing of described 2nd UE to make the data of a described UE send timing, wherein, described very first time deviation is the time deviation between described second up timing and described first descending timing.

In an optional implementation:

Described radio receiving-transmitting unit 610 receives configuration parameter can also comprise the first running time-frequency resource position that a described UE sends detectable signal;

Described radio receiving-transmitting unit 610, can also be used in described first running time-frequency resource position, according to up timed sending first detectable signal of first between a described UE and described base station, to make described 2nd UE according to after the first detectable signal described in the descending timing acquisition of second between described base station, described first detectable signal is detected by signal correlation, obtain the second time deviation, and carry out time synchronized according to described second time deviation and a described UE, consistent with the data receiver timing of a described UE to make the data of described 2nd UE send timing, wherein, described second time deviation is the time deviation between described first up timing and described second descending timing.

In another optional implementation:

Described processor 620, can specifically for calculating the difference of described first up timing and described very first time deviation, described difference is defined as the first up timing after upgrading, by the 4th detectable signal that described radio receiving-transmitting unit sends according to the 2nd UE described in described first descending timing acquisition, described 4th detectable signal is that described 2nd UE is in described second running time-frequency resource position, according to the detectable signal of the second up timed sending after renewal, after described renewal second up timing is described second up timing and the difference of described second time deviation, described 4th detectable signal is detected by signal correlation, obtain the 3rd time deviation, described 3rd time deviation is the second up timing after described renewal and the time deviation between described first descending timing, and the time synchronized timing difference between up for first after described renewal timing and described 3rd time deviation is defined as between a described UE and the 2nd UE.

In another optional implementation:

Described radio receiving-transmitting unit 610, can also be used in described first running time-frequency resource position, according to the up timed sending of first after described renewal the 3rd detectable signal, to make described 2nd UE according to after the 3rd detectable signal described in described second descending timing acquisition, described 3rd detectable signal is detected by signal correlation, obtain the 4th time deviation, and the time synchronized timing difference between up for second after described renewal timing and described 4th time deviation is defined as between described 2nd UE and a described UE, described 4th time deviation is the first up timing after described renewal and the time deviation between described second descending timing, and, after obtaining described 3rd time deviation, send first of the described UE entry time synchronous regime of instruction to described 2nd UE synchronously to indicate, and receive described 2nd UE and obtain after described 4th time deviation, second of the described 2nd UE entry time synchronous regime of instruction sent to a described UE synchronously indicates.

In another optional implementation:

Described radio receiving-transmitting unit 610, described very first time deviation can also be used for report to described base station, to make described base station that described very first time deviation is transmitted to described 2nd UE, the time synchronized timing of described very first time deviation for making described 2nd UE the difference between described second up timing and described very first time deviation be defined as between described 2nd UE and a described UE; What receive that described base station sends first configure message, and described first configure message be, after described 2nd UE receives the acknowledge message of described very first time deviation to the transmission confirmation of described base station, sent to the message of a described UE by base station; And receive the second time deviation that described base station forwards, described second time deviation is the time deviation that described 2nd UE reports to described base station; Send the acknowledge message confirming to receive described second time deviation to described base station, send second to make described base station to described 2nd UE and configured message;

Described processor 620, can specifically for being defined as the time synchronized timing between a described UE and described 2nd UE by the difference between described first up timing and described second time deviation.

In another optional implementation:

Described radio receiving-transmitting unit 610, the time synchronized timing between can also being used for according to a described UE and the 2nd UE sends data to described 2nd UE; Receive the data that described 2nd UE sends to a described UE according to the time timing between a described 2nd UE and UE.

As seen from the above-described embodiment, when setting up straight-through link between the one UE and the 2nd UE, receive the configuration parameter comprising the second running time-frequency resource position of the 2nd UE transmission detectable signal that base station sends, according to the second detectable signal that the descending timing acquisition of first between base station the 2nd UE sends, the second detectable signal is detected by signal correlation, obtain the very first time deviation between the second up timing and described first descending timing, time synchronized is carried out according to very first time deviation and the 2nd UE, consistent with the data receiver timing of the 2nd UE to make the data of a UE send timing.The application embodiment of the present invention, can by the detectable signal between straight-through UE, the data of UE of making a start between the straight-through UE of adjustment send timing, the timing of the data receiver of itself and receiving end UE is consistent, thus make between straight-through UE can according to the time synchronized timing transmission data after adjustment, ensure that the accuracy of transfer of data between straight-through UE, improve the efficiency of frequency employment of system.

Those skilled in the art can be well understood to the mode that technology in the embodiment of the present invention can add required general hardware platform by software and realize.Based on such understanding, technical scheme in the embodiment of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment of the present invention or embodiment.

Each embodiment in this specification all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for system embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.

Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any amendment done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims

1. the method for synchronizing time between direct user equipment UE, is characterized in that, described method comprises:

2. method according to claim 1, is characterized in that, described configuration parameter also comprises the first running time-frequency resource position that a described UE sends detectable signal;

After the configuration parameter that described reception base station sends, described method also comprises: a described UE is in described first running time-frequency resource position, according to the up timed sending first of first between described base station detectable signal, to make described 2nd UE according to after the first detectable signal described in the descending timing acquisition of second between described base station, described first detectable signal is detected by signal correlation, obtain the second time deviation, and carry out time synchronized according to described second time deviation and a described UE, consistent with the data receiver timing of a described UE to make the data of described 2nd UE send timing, wherein, described second time deviation is the time deviation between described first up timing and described second descending timing.

3. method according to claim 2, is characterized in that, a described UE carries out time synchronized according to described very first time deviation and described 2nd UE, comprising:

4. method according to claim 3, is characterized in that, described method also comprises:

5. method according to claim 2, is characterized in that, a described UE carries out time synchronized according to described very first time deviation and described 2nd UE, comprising:

A described UE receives first of described base station transmission and has configured message, described first to have configured message be described 2nd UE send confirm to receive the acknowledge message of described very first time deviation to described base station after, sent to the message of a described UE by base station;

And,

6. the method according to claim 4 or 5, is characterized in that, after a described UE carries out time synchronized according to described very first time deviation and described 2nd UE, described method also comprises:

7. a UE, is characterized in that, described UE, as the UE between straight-through UE, comprising:

8. UE according to claim 7, is characterized in that, the configuration parameter that described dispensing unit receives also comprises the first running time-frequency resource position that a described UE sends detectable signal;

Described UE also comprises:

9. UE according to claim 8, is characterized in that, described lock unit comprises:

10. UE according to claim 9, is characterized in that, described lock unit also comprises:

11. UE according to claim 8, is characterized in that, described lock unit comprises:

12. UE according to claim 10 or 11, it is characterized in that, described UE also comprises:

13. 1 kinds of UE, is characterized in that, described UE, as the UE between straight-through UE, comprising: radio receiving-transmitting unit and processor, wherein,

14. UE according to claim 13, is characterized in that, described radio receiving-transmitting unit receives configuration parameter and also comprises the first running time-frequency resource position that a described UE sends detectable signal;

15. UE according to claim 14, is characterized in that,

Described processor, specifically for calculating the difference of described first up timing and described very first time deviation, described difference is defined as the first up timing after upgrading, by the 4th detectable signal that described radio receiving-transmitting unit sends according to the 2nd UE described in described first descending timing acquisition, described 4th detectable signal is that described 2nd UE is in described second running time-frequency resource position, according to the detectable signal of the second up timed sending after renewal, after described renewal second up timing is described second up timing and the difference of described second time deviation, described 4th detectable signal is detected by signal correlation, obtain the 3rd time deviation, described 3rd time deviation is the second up timing after described renewal and the time deviation between described first descending timing, and the time synchronized timing difference between up for first after described renewal timing and described 3rd time deviation is defined as between a described UE and the 2nd UE.

16. UE according to claim 15, is characterized in that,

Described radio receiving-transmitting unit, also in described first running time-frequency resource position, according to the up timed sending of first after described renewal the 3rd detectable signal, to make described 2nd UE according to after the 3rd detectable signal described in described second descending timing acquisition, described 3rd detectable signal is detected by signal correlation, obtain the 4th time deviation, and the time synchronized timing difference between up for second after described renewal timing and described 4th time deviation is defined as between described 2nd UE and a described UE, described 4th time deviation is the first up timing after described renewal and the time deviation between described second descending timing, and, after obtaining described 3rd time deviation, send first of the described UE entry time synchronous regime of instruction to described 2nd UE synchronously to indicate, and receive described 2nd UE and obtain after described 4th time deviation, second of the described 2nd UE entry time synchronous regime of instruction sent to a described UE synchronously indicates.

17. UE according to claim 14, is characterized in that,

Described radio receiving-transmitting unit, also for described very first time deviation is reported to described base station, to make described base station that described very first time deviation is transmitted to described 2nd UE, the time synchronized timing of described very first time deviation for making described 2nd UE the difference between described second up timing and described very first time deviation be defined as between described 2nd UE and a described UE; What receive that described base station sends first configure message, and described first configure message be, after described 2nd UE receives the acknowledge message of described very first time deviation to the transmission confirmation of described base station, sent to the message of a described UE by base station; And receive the second time deviation that described base station forwards, described second time deviation is the time deviation that described 2nd UE reports to described base station; Send the acknowledge message confirming to receive described second time deviation to described base station, send second to make described base station to described 2nd UE and configured message;

18. UE according to claim 16 or 17, is characterized in that,

Described radio receiving-transmitting unit, also for sending data according to the time synchronized timing between a described UE and the 2nd UE to described 2nd UE; Receive the data that described 2nd UE sends to a described UE according to the time timing between a described 2nd UE and UE.