CN103686689B - The discovery method and communication terminal of communication terminal in a kind of device-to-device communication - Google Patents

Abstract

The invention discloses the discovery method of communication terminal in a kind of communication of device-to-device and communication terminal, this method includes：First communication terminal determines that equipment finds the transfer resource of signal according to the information including the device identification of itself, and transmission equipment finds signal in the transfer resource；Second communication terminal determines that the first communication terminal transmission equipment finds the transfer resource of signal, and find signal in the equipment that the transfer resource receives first communication terminal transmission according to the information including the device identification of the first communication terminal.By the above-mentioned means, so that the second communication terminal is without needing network-assisted can just realize the function of the first communication terminal in the range of discovering device to equipment communication.

Description

The discovery method and communication terminal of communication terminal in a kind of device-to-device communication

Technical field

The present invention relates to communication technical field, the discovery side of communication terminal in more particularly to a kind of device-to-device communication Method and communication terminal.

Background technology

D2D (Device to Device, device-to-device) communications are direct communication between communication terminal without appointing Direct communication between serving BS in the middle of what, communication terminal can efficiently reduce the expense of base station control signaling, more effectively Frequency spectrum resource is utilized to rate, the capacity of communication system is improved.

Present inventor has found in long interim research：The key of D2D communications how about is found in oneself communication range Communication terminal.

A kind of prior art occurred at present is：The D2D method for discovering equipment of network assistance.As shown in figure 1, communication terminal 1 and communication terminal 2 with cellular communications networks set up communicate to connect.Network according to the position of communication terminal 1 and communication terminal 2, The possibility that there is two communication terminals D2D to communicate is determined, now, base station meeting dispatching communication terminal 1 sends equipment and finds signal, And communication terminal 1 is sent to the time announcement communication terminal 2 of device signal, communication terminal 2 sends equipment in communication terminal 1 and found The time of signal goes receiving device to find signal, if it is possible to which the equipment that successfully be detected communication terminal 1 finds signal, then it is assumed that Communication terminal 1 and communication terminal 2 can perform D2D communications in mutual D2D communication ranges.This method requirement two is led to Believe that terminal is all set up with base station to communicate to connect, and require base station scheduling and notify terminal device to find the time of signal, it is necessary to base Stand auxiliary.If base station does not have auxiliary equipment discovery feature, or terminal can not be set up with base station and communicate to connect, then can not carry out Equipment is found.

The content of the invention

The present invention solves the technical problem of the discovery side for providing the communication terminal in a kind of device-to-device communication Method and communication terminal embodiment, enable to a communication terminal without needing network-assisted can just realize discovering device to equipment The function of another communication terminal in communication range.

In order to solve the above technical problems, one aspect of the present invention is：A kind of device-to-device communication is provided Communication terminal discovery method, this method includes：First communication terminal according to the information including the device identification of itself, it is determined that Equipment in device-to-device communication finds the transfer resource of signal, and transmits in the transfer resource setting for the first communication terminal The existing signal of preparation.

In order to solve the above technical problems, another technical solution used in the present invention is：A kind of device-to-device is provided to lead to The discovery method of communication terminal in letter, this method includes：Second terminal determines the device identification of the first communication terminal；Second communication Terminal determines that the first communication terminal transmission equipment finds the biography of signal according to the information including the device identification of the first communication terminal Defeated resource；Second communication terminal receives first terminal in identified first communication terminal device finds signal transmission resource Equipment finds signal.

In order to solve the above technical problems, another technical scheme that the present invention is used is：A kind of communication terminal is provided, this leads to Letter terminal includes：Acquisition module, for the information including the device identification according to communication terminal, is determined in device-to-device communication Equipment find signal transfer resource；Transport module, for the transmission equipment discovery signal in transfer resource.

In order to solve the above technical problems, another technical scheme that the present invention is used is：A kind of communication terminal is provided, including Processor and antenna；The information that processor is used for including the device identification according to communication terminal, is determined in device-to-device communication Equipment find signal transfer resource, and in transfer resource pass through antenna transmission equipment find signal.

In order to solve the above technical problems, another technical scheme that the present invention is used is：A kind of communication terminal is provided, including Determining module, the device identification for determining another communication terminal to be searched；Acquisition module, for according to another communication terminal Device identification including information, determine that another communication terminal transmission equipment finds the transfer resource of signal；Receiving module, is used for The equipment is received in the first time predefined after the transfer resource or the transfer resource and finds signal.

In order to solve the above technical problems, another technical scheme that the present invention is used is：A kind of communication terminal is provided, including Including processor and antenna；The information that processor is used for including the device identification according to another communication terminal, determines another communication Terminal transmission equipment finds the transfer resource of signal, and receives in transfer resource the equipment by antenna and find signal.

The beneficial effect of embodiment of the present invention is：It is different from the situation of prior art, embodiment of the present invention One communication terminal determines that equipment finds the transfer resource of signal according to the information including the device identification of itself, and in the equipment It was found that transmission equipment finds signal in the transfer resource of signal；On the other hand, the second communication terminal is according to the first communication terminal Information including device identification, determines that the first communication terminal transmission equipment finds the transfer resource of signal, and in the transfer resource Receive the equipment and find signal.And above-mentioned whole process, the first communication terminal and the second communication terminal need not be built with network Vertical connection, and the second communication terminal determines that the first communication terminal transmission equipment finds the transfer resource and the first communication terminal of signal Determine that transmission equipment finds that the transfer resource of signal is identical so that the second communication terminal is without needing network-assisted can just realize hair The function of the first communication terminal in existing device-to-device communication range.

Brief description of the drawings

Fig. 1 is the structural representation of prior art mobile radio communication；

Fig. 2 is the flow chart of present device discovery method first embodiment of communication terminal into equipment communication；

Fig. 3 is that into equipment communication, transfer resource is present device in the discovery method first embodiment of communication terminal Transfer resource schematic diagram during transmission time；

Fig. 4 is that into equipment communication, transfer resource is present device in the discovery method first embodiment of communication terminal Transfer resource schematic diagram when transmission time and transmission frequency；

Fig. 5 is that present device into equipment communication, believe in the discovery method first embodiment of communication terminal by timing Number schematic diagram；

Fig. 6 is that into equipment communication, equipment finds letter to present device in the discovery method first embodiment of communication terminal Number a kind of form schematic diagram；

Fig. 7 is that into equipment communication, equipment finds letter to present device in the discovery method first embodiment of communication terminal Number another form schematic diagram；

Fig. 8 is the flow chart of present device discovery method second embodiment of communication terminal into equipment communication；

Fig. 9 is that into equipment communication, beep-page message is passed present device in the discovery method second embodiment of communication terminal The schematic diagram of defeated chance；

The flow chart of Figure 10 present devices embodiment of discovery method the 3rd of communication terminal into equipment communication；

Figure 11 is the flow chart of present device embodiment of discovery method the 4th of communication terminal into equipment communication；

Figure 12 is the structural representation of communication terminal first embodiment of the present invention；

Figure 13 is the structural representation of communication terminal second embodiment of the present invention；

Figure 14 is the structural representation of the embodiment of communication terminal the 3rd of the present invention；

Figure 15 is the structural representation of the embodiment of communication terminal the 4th of the present invention.

Embodiment

The present invention is described in detail with embodiment below in conjunction with the accompanying drawings.

Referring to Fig. 2, Fig. 2 is the discovery method first embodiment of present device communication terminal into equipment communication Flow chart.As illustrated, methods described includes：

Step S101：First communication terminal determines that device-to-device communicates according to the information including the device identification of itself In equipment find signal transfer resource；

The device identification of first communication terminal reveals the first communication for that can reveal to other communication terminals without causing The individual privacy of terminal and the mark of security, for example：Telephone number or pre-defined mark.Wherein, the first communication terminal It is predefined be designated the special identifier distributed according to business function, and the quantity of the predefined mark of the first communication terminal can Think multiple, the quantity of the predefined mark of same business function can also be it is multiple, for example：First communication terminal is transmitted During advertising message business, when device identification is 15bit, then the predefined mark of the first communication terminal could be arranged to F FFFF FFFF FFFF FFFF are set to F FFFF FFFF FFFFFFF0~F FFFF FFFF FFFF FFFF, the first communication When terminal carries out friend-making business, then the predefined mark of the first communication terminal could be arranged to FFFF FFFF FFFF FFF1, the When one communication terminal progress picture shares business, then the predefined mark of the first communication terminal could be arranged to FFFFF FFFF FFFF FFF2 etc..

Transfer resource is wireless communication resources, and wireless communication resources include transmission time, transmission frequency, transmission code, transmission Beam direction etc., in embodiments of the present invention, transfer resource can be transmission time, or transfer resource be transmission frequency, Combination of at least one in transmission code, transmission beam direction with transmission time.

First communication terminal determines setting in device-to-device communication according to the information including the device identification of itself Preparation shows the transfer resource of signal, and one of which implementation is：

S=D_UE_ID mod N

S is the numbering of transfer resource, and D_UE_ID is the device identification of the first communication terminal, and N is the sum of transfer resource, Found to the transmission period of signal as the first communication terminal transmission equipment, by this transmission period periodic a period of time Be arranged to Nt sub- transmission periods, and in this transmission period, by frequency band be arranged to Nf transmission frequencies section and/or It is provided with Nc transmission code and/or spatial domain and is provided with N b transmission beams direction, Nt, Nf, Nc and Nb is whole more than zero Number, if equipment finds that signal transmission resource does not account for the multiplexing on frequency domain, Nf=1, if equipment finds signal transmission Resource does not account for the multiplexing in code domain, then Nc=1, if equipment finds that signal transmission resource does not account for answering on spatial domain With then Nb=1, one sub- transmission period can be used as a transfer resource, or sub- transmission frequency section, a transmission code At least one in Shu Fangxiang is transmitted with the combination of a sub- transmission period as a transfer resource with one, and therefore, N is equal to Nt, either N is equal to Nt and the product of product or N equal to Nt and Nf, Nc and Nb of at least one in Nf, Nc and Nb, Mei Yichuan Defeated resource is provided with unduplicated numbering, and numbers corresponding with the integer between 0~N-1.As shown in figure 3, transmission money When source is transmission time, then S=D_UE_ID mod Nt, or S=D_UE_ID mod N, wherein N=Nf*Nt*Nb*Nc, Nf= Nb=Nc=1；As shown in figure 4, when transfer resource is transmission time and transmission frequency, then S=D UE ID mod Nt*Nf, or S= D_UE_ID mod N, wherein N=Nf*Nt*Nb*Nc, Nb=Nc=1.

First communication terminal determines setting in device-to-device communication according to the information including the device identification of itself The transfer resource of the existing signal of preparation, wherein another implementation is：Wherein, each transfer resource is provided with numbering, D_ UE_ID is the device identification of the first communication terminal, and according to the total N of transfer resource, the total N maximums two for calculating transfer resource are entered Bit number processed, is set to Nx, and Nx bits are intercepted from D_UE_ID binary identification, and this partial bit is converted into binary number institute Corresponding decimal number, as selected transfer resource numbering S.Such as N is that 256, Nx is that 8, D_UE_ID maximum number bits are 16, it is assumed that D_UE_ID is FEE2, middle 8 bits of interception are hexadecimal number EE as S, i.e. S, and decimal number 238 selects 238th resource as the first communication terminal transfer resource.

Further, equipment finds that the transmission period of signal is less than or equal to equipment and finds signal transmission intercal Tsch, equipment finds that signal transmission intercal refers to that same equipment sends the time that equipment finds signal twice, and equipment finds signal Output time section refers to find to keep for the time of transmission equipment discovery signal, equipment discovery letter in signal transmission intercal in equipment Number transmission period be less than equipment find signal transmission intercal, then equipment find signal transmission intercal in except equipment find letter The time of number transmission period can be used for the communication of other purposes, such as paging or the transmission of user data.Equipment It was found that the transmission period and equipment of signal find that the transmission intercal of signal can be preset or each small by network Area each sets and notifies communication terminal by broadcasting the message.

First communication terminal again can be from mobile radio communication, internet or GPS（Global Positioning System, Global positioning system）Obtain the signal of timing, it is preferred that the first communication terminal obtains the letter of timing from cellular basestation Number.As shown in figure 5, timing includes System Frame Number, subframe numbers, frame timing and subframe timing.Frame timing is used to indicate system The initial time of each frame, can determine the size of system-frame according to frame timing.Subframe timing is used to indicate each system subframe Initial time, can determine the size of system subframe, and can determine system according to frame timing and subframe timing according to subframe timing The magnitude relationship of frame and system subframe.First communication terminal can combine device identification and the timing of itself again, it is determined that transmission Resource, therefore, step S101 can be specially again：Device identification and timing of first communication terminal according to itself, it is determined that setting The standby equipment into equipment communication finds the transfer resource of signal.Wherein, transfer resource can be individually for transmission time, or transmission Combination of the resource at least one in transmission frequency, transmission code and transmission beam direction with transmission time.In one system-frame A subframe be defined as the transmission time of a transfer resource, further, frequency band can be arranged to Nf son transmission Frequency band and/or Nb transmission beam direction of setting on Nc transmission code and/or spatial domain is set, transfer resource can be with Only it is a system subframe in a system-frame, or the system subframe and a son in a system subframe are transmitted Frequency band, transmission code, the combination of at least one of transmission direction.

Wherein, the system subframe in system-frame and system-frame is obtained by following calculation：

Sys_F_Num mod(Tsch/M)=D_UE_ID/M mod(Tsch/M)

Sub_F_Num=D_UE_ID mod M

Or be：

Sys_F_Num mod Tsch=D_UE_ID mod Tsch

Sub_F_Num=D_UE_ID mod M

Or be：

Sys_F_Num mod Tsch=D_UE_ID mod Tsch

Sub F Num are the random integers in 0~M-1

Or be：

(Sys_F_Num*M+Sub_F_Num)mod Tsch=D_UE_ID mod Tsch

Or be：

Sys_F_Num mod Tsch/M=D_UE ID mod Tsch/M

Sub F Num are the random integers in 0~M-1；

Or be：

(Sys_F_Num*M+Sub_F_Num)mod Tsch=D_UE_ID/Nb/Nc/Nf mod Tsch

Or be：

(Sys_F_Num*M+Sub_F_Num)mod Tsch=D_UE_ID/Nf mod Tsch

Or be：

(Sys_F_Num*M+Sub_F_Num)mod Tsch=D_UE_ID/Nb mod Tsch

Or be：

(Sys_F_Num*M+Sub_F_Num)mod Tsch=D_UE_ID/Nc mod Tsch

Or be：

(Sys_F_Num*M+Sub_F_Num)mod Tsch=D_UE_ID/Nb/Nc mod Tsch

Or be：

(Sys_F_Num*M+Sub_F_Num)mod Tsch=D_UE_ID/Nc/Nf mod Tsch

Or be：

(Sys_F_Num*M+Sub_F_Num)mod Tsch=D_UE_ID/Nb/Nf mod Tsch

Sub- transmission frequency section is obtained by following calculation：

Sub_Brand_Num=(D_UE_ID/Tsch)mod Nf

Or be：

Sub_Brand_Num=D_UE_ID mod Nf

Or be：

Sub_Brand_Num=（D_UE_ID/Tsch/Nc）mod Nf

Or be：

Sub_Brand_Num=（D_UE_ID/Tsch/Nb）mod Nf

Or be：

Sub_Brand_Num=（D_UE_ID/Nc/Nb）mod Nf

Or be：

Sub_Brand_Num=（D_UE_ID/Tsch/Nc/Nb）mod Nf

Or be：

Sub_Brand_Num=（D_UE_ID/Nb）mod Nf

Or be：

Sub_Brand_Num=（D_UE_ID/Nc）mod Nf

Transmission code is obtained by following calculation：

Sub_Code_Num=D_UE_ID mod Nc

Or be：

Sub_Code_Num=(D_UE_ID/Nf)mod Nc

Or be：

Sub_Code_Num=(D_UE_ID/Tsch/Nf)mod Nc

Or be：

Sub_Code_Num=(D_UE_ID/Tsch)mod Nc

Or be：

Sub_Code_Num=(D_UE_ID/Nb)mod Nc

Or be：

Sub_Code_Num=(D_UE_ID/Nf/Nb)mod Nc

Or be：

Sub_Code_Num=(D_UE_ID/Tsch/Nb)mod Nc

Or be：

Sub_Code_Num=(D_UE_ID/Tsch/Nb/Nf)mod Nc

Transmission beam direction is obtained by following calculation：

Sub_B eam_Num=(D_UE_ID/Tsch)mod Nb

Or be：

Sub_Beam_Num=(D_UE_ID/Tsch/Nc)mod Nb

Or be：

Sub_Beam_Num=(D_UE_ID/Tsch/Nf)mod Nb

Or be：

Sub_Beam_Num=(D_UE_ID/Nf/Nc)mod Nb

Or be：

Sub_Beam_Num=(D_UE_ID/Tsch/Nc/Nf)mod Nb

Or be：

Sub_Beam_Num=(D_UE_ID/Nc)mod Nb

Or be：

Sub_Beam_Num=(D_UE_ID/Nb)mod Nb

Sys_F_Num and Sub_F_Num be respectively the first communication terminal transmission equipment find signal when System Frame Number and System subframe number, Tsch is the Transmission Time Interval that equipment finds signal, and Tsch is that in units of system subframe, M is to be The sum of the system subframe for frame in of uniting, M system subframe is equal to a system-frame, and D_UE_ID is the equipment of the first communication terminal Mark, wherein, Nf is has found the quantity of the sub- transmission frequency section of signal for equipment, and each sub- transmission frequency section is respectively provided with There is unduplicated numbering, Sub_Brand_Num is one of them sub- transmission frequency segment number, and Nc is the sum of transmission code, and often One transmission code is provided with unduplicated numbering, and Sub_Code_Num is one of transmission code number, and Nb is transmission beam direction Sum, and each beam direction is provided with unduplicated numbering, and Sub_Beam_Num is one of transmission beam side Xiang Hao.

Step S102：First communication terminal transmission equipment in the transfer resource finds signal；

First communication terminal transmission equipment in the transfer resource finds that signal is：First communication terminal is in step S101 Transmission equipment finds signal in the transfer resource of determination, for example：Transfer resource is transmission time, and the biography that step S101 is determined The defeated time is the second system subframe of second system frame in, then the first communication terminal is inferred to reach that second is according to timing The time of the second system subframe for frame in of uniting, and find signal in this time transmission equipment.

Equipment finds that the form of signal can be the form pre-defined, and the form pre-defined includes following It is one or several kinds of：Equipment finds reflecting for modulation system, coded system, data information content, data and the pilot signal of signal Penetrate relation etc..In embodiments of the present invention, equipment finds that the form of signal includes pilot portion and/or message part, wherein Pilot portion is pre-defined sequence, for example：Pre-defined pseudo-random sequence m-sequence, M sequence, Gold sequence etc., and or Person is the sequence with good autocorrelation performance and cross correlation, such as Zaddoff-Chu sequences, Walsh codes, pilot tone portion Dividing can be located at the leading part before message part or be located at the reference signal of before message part or centre again Rear pilot point either behind information, and the sequence of pilot portion can be all devices made an appointment all phases Same sequence, the complexity or different equipment that can so reduce search equipment uses different sequences, so may be used To reduce the probability of conflict.

Wherein, a kind of equipment finds that the form of signal only includes pilot portion.Wherein another equipment finds the lattice of signal Formula includes leading part and message part, and leading part is pre-defined sequence, for synchronization and/or channel estimation；Information Part is used to carry the information related to equipment discovery, and such as the first communication terminal device is identified, transimission power, as shown in Figure 6. Wherein another equipment finds that the form of signal includes reference signal time slot and information transmission time slots, reference signal time slot and information The quantity of transmission time slot is one or more, and the pre-defined sequence of reference signal time slot carrying is estimated for synchronization and channel Meter, information transmission time slots are used to carry the information related to equipment discovery, such as the first communication terminal device mark, transimission power Deng as shown in Figure 7.

In embodiments of the present invention, the first communication terminal determines equipment according to the information including the device identification of itself It was found that the transfer resource of signal, and transmission equipment finds signal in the transfer resource so that the second communication terminal also can basis Information including the device identification of first communication terminal determines that the first communication terminal transmission equipment finds the transfer resource of signal, and The equipment is received in the transfer resource and finds signal.The first communication terminal transmission equipment that second communication terminal is determined finds letter Number transfer resource find that the transfer resource of signal is identical with the communication terminal device of transmission first that the first communication terminal is determined, and Second communication terminal only searches for setting for the first communication terminal in the transfer resource that the first communication terminal transmission equipment finds signal The existing signal of preparation so that the second communication terminal is without needing network-assisted can just realize discovering device in the range of equipment communication The function of first communication terminal.

Referring to Fig. 8, Fig. 8 is the discovery method second embodiment of present device communication terminal into equipment communication Flow chart.As illustrated, methods described includes：

Step S201：First communication terminal determines that device-to-device communicates according to the information including the device identification of itself In equipment find signal transfer resource；

The device identification of first communication terminal can be telephone number or be the predefined mark distributed according to business function Know.First communication terminal is determined according to the information including the device identification of itself in the method and first embodiment of transfer resource First communication terminal determines that the method for transfer resource is identical according to the device identification of the first communication terminal, no longer goes to live in the household of one's in-laws on getting married one by one herein State.

Step S202：First communication terminal determines whether that the higher business of priority takes the transfer resource, and should Business can not find that signal takes the transfer resource jointly with equipment；

If the first communication terminal determine the transfer resource by priority it is higher and can not with equipment find signal account for jointly When being taken with the business of the transfer resource, for example：Priority is higher and needs to monopolize reception business of the transfer resource etc., then enters Enter step S203, otherwise into step S205.

Step S203：Search being capable of transmission equipment hair in the first time predefined after the transfer resource for first communication terminal Another transfer resource of existing signal；

Described first pre-defined time is for well known to all D2D communication terminals, and the first pre-defined time is not Can it is oversize, it is oversize, can cause increase by second the first communication terminal of communication terminal searches power consumption, can not be too short, too it is short then The transfer resource that suitable transmission equipment finds signal can not be found by being likely to result in the first communication terminal, be typically chosen first pre- The time is first defined no more than 8ms, it is preferred that this time is 4ms.If the first communication terminal searches to can transmission equipment find Another transmission time of signal, then into step S304, otherwise abandon this transfer resource, waits next transfer resource.

Step S204：When first communication terminal is by the transmission for being capable of transmission equipment discovery signal searched in step S203 Between transmission time in the transfer resource of signal is found as transmission equipment, its remainder in the transfer resource keeps constant, i.e., Transmission frequency and/or transmission code and/or transmission beam keep constant.

Step S205：First communication terminal transmission equipment in the transfer resource finds signal；

First communication terminal transmission equipment in the transfer resource finds that signal is：First communication terminal is in step S204 Or transmission equipment finds signal in the transfer resource of S201 determinations, for example：The transfer resource that step S204 or S201 are determined For the second system subframe of second system frame in, then the first communication terminal is sub in the second system of time arrival second system frame in During frame, signal is found in this time transmission equipment.

Further, the first communication terminal transmission equipment find signal business can be used alone the transfer resource or The business that first communication terminal transmission equipment signals can be used in conjunction with the transfer resource with other business, for example：First communication Terminal transmission equipment finds that the business of signal and the first communication terminal receive the transfer resource of the equipment discovery signal of other equipment Identical, then the first communication terminal is in the transfer resource, and the equipment that other equipment is received sometimes finds signal, and oneself is sent sometimes Equipment find signal, such as：Find that signal transmission resource suspends this equipment and finds signal transmission in an equipment, next time Equipment finds that signal transmission resource transmission equipment finds signal；Or find that signal transmission resource suspends this equipment in two secondary devices It was found that signal is transmitted, find that signal transmits the equipment discovery signal of this equipment in lower two secondary device.

Equipment finds that the form of signal includes pilot portion and/or message part, and wherein pilot portion is pre-defined Sequence, such as sequence with good autocorrelation performance and cross correlation.Pilot portion can be located at before message part Leading part be located at before message part or rear pilot of the middle reference signal either behind information Point, the sequence of pilot portion can be that all devices made an appointment all identical sequences or different equipment are adopted With different sequences.One of which equipment finds that the form of signal only includes pilot portion.Wherein another equipment finds signal Form include leading part and message part, the specific sequence that pre-defines of leading part carrying, for synchronous and letter Estimate that message part is used to carry the information related to equipment discovery, for example in road：First communication terminal device mark, transmission work( Rate etc..Wherein, another equipment finds that the form of signal includes reference signal time slot and information transmission time slots, during reference signal Gap carries reference signal, and reference signal is the specific sequence pre-defined, for synchronization and channel estimation, during information transfer Gap is used to carry the information related to equipment discovery, such as the first communication terminal device mark, transimission power.

Step S206：After being spaced for second scheduled time after the first communication terminal transmission equipment finds signal, the first communication Terminal receives the beep-page message from the second communication terminal in pre-defined beep-page message transmission opportunity, so that first is logical Letter terminal can determine the progress D2D communications between the second communication terminal, wherein, pre-define the quantity of beep-page message transmission opportunity At least one and one pre-defined beep-page message transmission opportunity carries a beep-page message；

As shown in Figure 9.Predefined beep-page message transmission opportunity is arranged at the first communication terminal transmission equipment and found after signal It is spaced after second scheduled time, second scheduled time is for well known to the communication terminal that all participation D2D communicate, and second makes a reservation for Time is unsuitable oversize, as long as finding the time of signal and generating beep-page message, example more than other communication terminal processing equipments It is such as 4ms after the first communication terminal transmission equipment discovery signal, such design can reduce by the first communication terminal and not receive The free time of signalling, save power consumption.The quantity of predefined beep-page message transmission opportunity is multiple, and as shown in Figure 9 totally 15 Individual beep-page message transmission opportunity, each beep-page message transmission opportunity carries a beep-page message, and the first communication terminal exists respectively All beep-page message receivers can receive beep-page message, wherein, setting multiple beep-page message transmission opportunitys to mitigate has many Conflict caused by the individual communication terminal of communication terminal paging first.

Beep-page message includes pilot portion and message part, as equipment finds signal, and pilot portion includes predefined Sequence, such as pseudo-random sequence or Zadoff-Chu sequence.Pilot portion in beep-page message finds signal with equipment The sequence that pilot tone is transmitted can be with identical, can also be different.Realization can then be reduced to a certain extent using identical sequence multiple Miscellaneous degree.Erroneous judgement can be then avoided using different sequences.It is preferred that, the pilot portion and equipment of beep-page message find leading for signal Frequency part uses different sequences.Message part includes the device identification of the second communication terminal, for receiving beep-page message First communication terminal notifies the mark of the equipment of initiation paging, and message part can also include the device identification of the first communication terminal And/or second communication terminal transimission power, including the device identification of the first communication terminal can avoid other using the transmission Resource transmitting equipment finds that the communication terminal of signal responds the beep-page message, including the transimission power of the second communication terminal can be used for Transmission path estimation is lost to select suitable code modulation mode or carry out Power Control, interference control etc..

First communication terminal receives the paging from the second communication terminal in pre-defined beep-page message transmission opportunity Message, one of which specific implementation is：First communication terminal searches for beep-page message first in each transmission opportunity respectively In pilot portion, the beep-page message pilot frequency sequence being locally stored with the first communication terminal with beep-page message transmission opportunity Pilot signal is related, if correlation is higher than predetermined value, further, information portion of the demodulating and decoding in this beep-page message Point, if successfully decoded, then it is assumed that receive an effective beep-page message.Wherein, the first communication terminal is set in transmission basis The transmission resources for transmitting equipment that information including standby mark is determined finds the pre-defined beep-page message transmission opportunity after signal Beep-page message is received, if receiving beep-page message, then can be communicated with other equipment, can be with if do not received Into sleep to save power consumption, so as to the power consumption caused by avoiding the first communication terminal from being in reception state for a long time.

In embodiment party of the present invention applies, the first communication terminal determines equipment according to the information including the device identification of itself It was found that the transfer resource of signal, and transmission equipment finds signal in the transfer resource, another side, the second communication terminal also according to Information including the device identification of first communication terminal determines that the first communication terminal transmission equipment finds the transfer resource of signal, and The equipment is received in the transfer resource and finds signal.The first communication terminal transmission equipment that second communication is determined finds signal Transfer resource finds that the transfer resource of signal is identical with the communication terminal device of transmission first that the first communication terminal is determined, and second Communication terminal only finds that the transfer resource of signal searches for the equipment discovery of the first communication terminal in the first communication terminal transmission equipment Signal so that the second communication terminal without need it is network-assisted can just realize in the range of discovering device to equipment communication first lead to Believe the function of terminal.

The present invention provides a kind of discovery method embodiment of communication terminal in device-to-device communication again.Refer to figure 10, Figure 10 be the flow chart of present device embodiment of discovery method the 3rd of communication terminal into equipment communication.As schemed Show, methods described includes：

Step S301：Second communication terminal determines the device identification of the first communication terminal to be searched.

The device identification of first communication terminal can be telephone number or the predefined mark distributed according to business function. Second communication terminal determines the device identification of the first communication terminal to be searched, example according to the service request of the second communication terminal Such as：Second communication terminal will share photo with the first communication terminal, then the second communication terminal is according to the second user of communication terminal Selection determines the device identification of the first communication terminal to be searched for；If the second communication terminal will carry out receiving advertisement business, The device identification of the communication terminal for the advertising business that second terminal is pre-defined according to system, determines the first communication to be searched eventually The device identification at end；If the high-level business of the second communication terminal requires that the second communication terminal finds that what is oneself stored is related People, or part contact person, such as：The All Contacts of " university's classmate's group ", or being related in " business associate group " People etc., or search for specific contact person, such as searches for some friend, the second communication terminal according to high-rise service request, The device identification of all contact persons to be searched is determined, the second communication terminal can also take from specific equipment, such as D2D business Business device, obtains the Affiliates List of a certain business, is such as owned the Affiliates List in " KFC shops ", or all " Beijing civil powers Affiliates List of movie theatre " etc., D2D terminals obtain the device identification of each contact person to be searched according to Affiliates List, or The communication terminal of person second can obtain the equipment mark of a certain contact person directly from specific equipment, such as D2D service servers Know.

Step S302：Second communication terminal determines that first leads to according to the information including the device identification of the first communication terminal Believe that terminal transmission equipment finds the transfer resource of signal；

Second communication terminal determines transfer resource method and first embodiment according to the device identification of the first communication terminal In the first communication terminal determine that the method for transfer resource is identical according to the device identification of the first communication terminal, herein no longer one by one Repeat.

Second communication terminal can obtain the timing of the first communication terminal from this serving cell, neighbours' serving cell again, Or second communication terminal from network or obtained from other communication terminals between the first communication terminal and the second communication terminal and be System timing difference, so that it is determined that the timing of the first communication terminal.Timing includes the system at current time system The initial time of frame number and system subframe number, the frame timing of the initial time of the instruction each frame of system and instruction system subframe Subframe timing.Step S302 can be specially again：Device identification and timing of second communication terminal according to the first communication terminal, Determine that equipment equipment of the first communication terminal transmission equipment into equipment communication finds the transfer resource of signal.

Second communication terminal determines transfer resource method and the according to the device identification and timing of the first communication terminal The first communication terminal in one embodiment determines transfer resource according to the device identification and timing of the first communication terminal Method is identical, no longer repeats one by one herein.

Step S303：Second communication terminal is received in the first time predefined after the transfer resource or transfer resource The equipment of first communication terminal transmission finds signal；

Second communication terminal receiving device in transfer resource finds that signal is：Second communication terminal is true in step S302 The equipment that the transmission of the first communication terminal is received in fixed transfer resource finds signal, for example：Step S302 determines that the first communication is whole Transmission equipment is held to find that the transfer resource of signal is second system frame and second system subframe, then the second communication terminal is according to system The time interval for reaching second system frame and second system subframe is inferred in timing, and is in time arrival second system frame and second During subframe of uniting, receiving device finds signal.

Well known to all D2D communication terminals of first time predefined, and the first pre-defined time can not be oversize, too Long then search time is oversize, and easily conflicts with other communication equipments, can not be too short, too short, may can not find suitable biography Defeated time, the first pre-defined time that was typically chosen is no more than 8ms, it is preferred that this time is 4ms.

Equipment finds that the form of signal includes pilot portion and/or message part, and wherein pilot portion is pre-defined Sequence is the sequence with good autocorrelation performance and cross correlation.Pilot portion can be located at before message part Leading part be located at before message part or rear pilot of the middle reference signal either behind information Point, the sequence of pilot portion can be that all devices made an appointment all identical sequences or different equipment are adopted With different sequences.One of which equipment finds that the form of signal only includes pilot portion.Wherein another equipment finds signal Form include leading part and message part, leading part be used for synchronization and channel estimation, message part be used for carry and set The existing related information of preparation, for example：The relevant informations such as the first communication terminal device mark, transimission power.Wherein another equipment It was found that the form of signal includes reference signal time slot and information transmission time slots, reference signal time slot is used for synchronous and channel and estimated Meter, information transmission time slots are used to carry the information related to equipment discovery, such as the first communication terminal device mark, transimission power Deng.

Second communication terminal finds that the transfer resource of signal receives first in identified first communication terminal transmission equipment The equipment of communication terminal transmission finds that signal one of which method is：It is logical with first locally stored according to the agreement of system Equipment of the letter terminal in device-to-device communication finds the pilot signal that signal transmission resource is transmitted, for example：Targeting signal And/or reference signal, find that the transmission signal of signal transmission resource is related to equipment of first communication terminal in D2D communications, If correlation exceedes predefined thresholding, then it is assumed that search the first communication terminal；Wherein another method is：Second communication The equipment that terminal demodulated and/or decoded in the device-to-device communication of the first communication terminal finds that signal transmission resource is transmitted Message part, if device identification included in it is the device identification of the first communication terminal, then it is assumed that search first Communication terminal；Wherein another method is：First according to the agreement of system, with the first communication terminal locally stored in equipment Equipment into equipment communication finds the pilot signal that signal transmission resource is transmitted, for example：Targeting signal and/or reference letter Number, find that the transmission signal of signal transmission resource is related to equipment of first communication terminal in D2D communications, if correlation is super Predefined thresholding is crossed, then demodulates and/or decodes the equipment in the device-to-device communication of the first communication terminal and find signal The message part that transfer resource is transmitted, if the device identification included in it is the device identification of the first communication terminal, Think to search the first communication terminal.

Further, if the second communication terminal cannot obtain the timing of the first communication terminal, the second communication is eventually End terminal carries out multiple in the transfer resource that the device identification according to the timing of oneself and the whole terminal of the first communication is determined The first communication terminal is searched for, if the first communication terminal still can not be searched, the second communication terminal uses different neighbours successively The timing of cell is occupied, and in the device identification according to the first communication terminal and used neighbor cell timing institute really Repeatedly the first communication terminal of search is carried out in fixed transfer resource, until search the first communication terminal or using this cell and The timing of all neighbor cells can not search out the first communication terminal, then it is assumed that the first communication terminal is not whole in the second communication Hold in communication range.

In embodiments of the present invention, the first communication terminal determines equipment according to the information including the device identification of itself It was found that the transfer resource of signal, and transmission equipment finds signal in the transfer resource, on the other hand, the second communication terminal also root Determine that the first communication terminal transmission equipment finds the transfer resource of signal according to the information including the device identification of the first communication terminal, And equipment discovery signal is received in the transfer resource.The first communication terminal transmission equipment that second communication is determined finds signal Transfer resource find that the transfer resource of signal is identical with transmission equipment that the first communication terminal is determined, and the second communication terminal is only Find that the transfer resource of signal searches for the equipment discovery signal of the first communication terminal in the first communication terminal transmission equipment so that the Two communication terminals are without needing network-assisted can just realize the work(of the first communication terminal in the range of discovering device to equipment communication Energy.

Referring to Fig. 10, Figure 10 is the implementation of discovery method the 4th of communication terminal in a kind of device-to-device communication of the invention The flow chart of mode.As illustrated, methods described includes：

Step S401：Second communication terminal determines the device identification of the first communication terminal to be searched；

The device identification of first communication terminal can be telephone number or the predefined mark distributed according to business function.

Step S402：Second communication terminal determines that first leads to according to the information including the device identification of the first communication terminal Believe that equipment of the terminal transmission equipment into equipment communication finds the transfer resource of signal；

Second communication terminal determines that transfer resource method communicates with first embodiment first according to the first communication terminal Terminal determines that the method for transfer resource is identical according to the device identification of the first communication terminal, no longer repeats one by one herein.

Second communication terminal can obtain the timing of the first communication terminal from this serving cell, neighbours' serving cell, Or second communication terminal can obtain the first communication terminal and the second communication terminal from network or from other communication terminals again Timing it is poor, so that it is determined that the timing of the first communication terminal.Timing is included at current time system During the starting of System Frame Number and system subframe number, the frame timing of the initial time of the instruction each frame of system and instruction system subframe The subframe timing at quarter.Step S402 can be specially again：Device identification and system of second communication terminal according to the first communication terminal Regularly, determine that equipment equipment of the first communication terminal transmission equipment into equipment communication finds the transfer resource of signal.

Second communication terminal determines transfer resource method and the according to the device identification and timing of the first communication terminal The first communication terminal determines the side of transfer resource according to the device identification and timing of the first communication terminal in one embodiment Method is identical, no longer repeats one by one herein.

Step S403：Second communication terminal is received in the first time predefined after the transfer resource or transfer resource The equipment of first communication terminal transmission finds signal；

Second communication terminal receiving device in transfer resource finds that signal is：Second communication terminal is true in step S402 The equipment that the transmission of the first communication terminal is received in fixed transfer resource finds signal, for example：The transfer resource that step S402 is determined For second system frame and second system subframe, then the second communication terminal is inferred according to timing reaches second system frame and second The time interval of system subframe, and when the time reaching second system frame and second system subframe, receive the first communication terminal and pass Defeated equipment finds signal.

Well known to all D2D communication terminals of first time predefined, and the pre-defined time can not be oversize, it is oversize then Search time is oversize, and easily conflicts with other equipment, can not be too short, it is too short, suitable transmission time may be can not find, It was typically chosen for the first pre-defined time no more than 8ms, it is preferred that this time is 4ms.

Equipment finds that the form of signal includes pilot portion and/or message part, and wherein pilot portion is pre-defined Sequence is the sequence with good autocorrelation performance and cross correlation.Pilot portion can be located at before message part Leading before message part or rear pilot point either behind information of middle reference signal, frequency Partial sequence can be all devices made an appointment all identical sequence or different equipment using different Sequence.One of which equipment finds that the form of signal only includes pilot portion.Wherein another equipment finds the form bag of signal Leading part and message part are included, leading part is used for synchronization and channel estimation, and message part is used to carry finds phase with equipment The information of pass, for example：First communication terminal device mark, transimission power etc..Wherein another equipment finds the form of signal Including reference signal time slot and information transmission time slots, reference signal time slot is used for synchronization and channel estimation, and information transmission time slots are used In carrying the information related to equipment discovery, such as the first communication terminal device mark, transimission power.

Second communication terminal finds that the transfer resource of signal receives first in identified first communication terminal transmission equipment Communication terminal transmission equipment finds that signal one of which method is：According to the agreement of system, with the first communication locally stored Equipment of the terminal in device-to-device communication finds the pilot signal that signal transmission resource is transmitted, for example：Targeting signal and/ Or reference signal, find that the transmission signal of signal transmission resource is related to equipment of first communication terminal in D2D communications, if Correlation exceedes predefined thresholding, then it is assumed that search the first communication terminal；Wherein another method is：Second communication terminal Demodulation and/or the equipment decoded in the device-to-device communication of the first communication terminal find the letter that signal transmission resource is transmitted Part is ceased, if the device identification included in it is the device identification of the first communication terminal, then it is assumed that search the first communication Terminal；Wherein another method is：First according to the agreement of system, with the first communication terminal locally stored in equipment to setting Equipment in standby communication finds the pilot signal that signal transmission resource is transmitted, for example：Targeting signal and/or reference signal, with Equipment of first communication terminal in D2D communications finds that the transmission signal of signal transmission resource is related, if correlation exceedes in advance The thresholding of definition, then demodulate and/or decode the equipment in the device-to-device communication of the first communication terminal and find signal transmission The message part that resource is transmitted, if the device identification included in it is the device identification of the first communication terminal, then it is assumed that Search the first communication terminal.

Step S404：Second communication terminal finds that the interval second after signal is pre- in the equipment for receiving the first communication terminal A predefined beep-page message transmission opportunity is selected after the definition time, and sends and seeks in the predefined beep-page message transmission opportunity Message is exhaled to the first communication terminal.

Predefined beep-page message transmission opportunity, the beep-page message well known to communication terminal communicated for all participation D2D Transmission opportunity, and the quantity of beep-page message transmission opportunity is multiple, it is to avoid multiple second communication terminal beep-page message conveyers Conflict caused by meeting one beep-page message transmission opportunity of simultaneous selection, the second communication terminal selection beep-page message transmission opportunity Mode can be a variety of, and one way in which is：One is selected from multiple beep-page message transmission opportunitys at random；It is wherein another Mode is：According to the device id of the second communication terminal（Mark）Selection one, it is assumed for example that have L beep-page message transmission opportunity, X=D_UE_ID2mod L beep-page message transmission opportunity is then selected, wherein, D_UE_ID2 is the equipment mark of the second communication terminal Know.Second scheduled time is unsuitable oversize, as long as finding the time of signal and generating beep-page message more than communication terminal processing equipment , for example selection is 5ms, and such design can shorten the stand-by period of the second communication terminal, saves power consumption.

Beep-page message includes pilot portion and message part, as equipment finds signal, and pilot portion includes predefined Sequence, such as pseudo-random sequence or Zadoff-Chu sequence.Pilot portion in beep-page message finds signal with equipment The sequence that pilot tone is transmitted can be with identical, can also be different.Realization can then be reduced to a certain extent using identical sequence multiple Miscellaneous degree.Erroneous judgement can be then avoided using different sequences.It is preferred that, the pilot portion and equipment of beep-page message find leading for signal Frequency part uses different sequences.The sequence of the pilot portion of the beep-page message of distinct device can be with identical, can also be different, excellent Choosing, the pilot portion of the beep-page message of all devices uses identical sequence.Message part includes setting for the second communication terminal Standby mark, the mark of the equipment for notifying initiation paging to the first communication terminal for receiving beep-page message, message part may be used also With the device identification including the first communication terminal and/or the transimission power of the second communication terminal, including the first communication terminal is set Standby mark can avoid other making the transfer resource send equipment to find that the communication terminals of signal respond the beep-page message and include the The transimission power of two communication terminals can be used for transmission path estimation to be lost to select suitable code modulation mode or carry out work( Rate control, interference control etc..

Second communication terminal sends beep-page message to the first communication terminal, and the second communication terminal can be caused to find first After communication terminal, set up and communicate to connect with the first communication terminal.In an embodiment of the present invention, the first communication terminal is in transmission root The transmission resources for transmitting equipment determined according to the information including device identification finds the pre-defined beep-page message transmission after signal Chance receives beep-page message, if receiving beep-page message, then can be communicated with other equipment, if do not received, Sleep can be entered to save power consumption, so as to the work(caused by avoiding the first communication terminal from being in reception state for a long time Consumption.

In embodiments of the present invention, the second communication terminal is according to the information including the device identification of the first communication terminal, Determine that the first communication terminal transmission equipment finds the transfer resource of signal, and receive in the transfer resource the first communication terminal Transfer resource is determined according to the information including the device identification of itself, and signal is found in the equipment of the transmission resources for transmitting.The The first communication terminal transmission equipment that two communication terminals are determined finds the biography that the transfer resource and the first communication terminal of signal are determined Transfer device finds that the transfer resource of signal is identical, and the second communication terminal only finds signal in the first communication terminal transmission equipment Transfer resource search for the first communication terminal equipment find signal so that the second communication terminal without need it is network-assisted just can be real It is now discovered that the function of the first communication terminal in device-to-device communication range.

Invention further provides a kind of communication terminal embodiment.Figure 12 is referred to, Figure 12 is that a kind of communication of the invention is whole Hold the structural representation of embodiment.As illustrated, the communication terminal 50 includes acquisition module 51 and transport module 55.Obtain The information that module 51 is used for including the device identification according to communication terminal 50, determines the communication terminal 50 in device-to-device communication Transmission equipment finds the transfer resource of signal.Wherein, device identification is chosen as telephone number or distributes pre- according to business function Definition mark.Transfer resource can with transmission time, or transfer resource be in transmission frequency, transmission code, transmission beam direction extremely Lack the combination of one and transmission time, wherein, acquisition module 51 determines transfer resource according to the device identification of communication terminal 50 Method determines that the method for transfer resource is identical with the first communication terminal in first embodiment according to the device identification of itself, to locate No longer repeat one by one.

Further, referring to Fig. 5.Timing includes System Frame Number, system subframe number, for indicating each system The subframe timing when frame timing of the initial time for subframe of uniting and starting for indicating each frame of system.Communication terminal 50 again can Timing is obtained by mobile radio communication, internet or GPS.Acquisition module 50 again can be specifically for according to communication terminal 50 Device identification and timing, determine equipment find signal transfer resource, wherein, acquisition module 50 is according to communication terminal 50 Device identification and timing determine the first communication terminal in the method and first embodiment of transfer resource according to itself Device identification is identical with the method that timing determines transfer resource, no longer repeats one by one herein.

Transport module 52 is used for the transmission equipment in the transfer resource that acquisition module 51 is determined and finds signal.Of the invention real Apply in mode, equipment finds that the form of signal includes pilot portion and/or message part, and pilot portion is pre-defined sequence Or be the sequence with good autocorrelation performance and cross correlation, before pilot portion can be located at before message part Lead before message part or middle reference signal or the rear pilot point behind information, it is described to lead The sequence of frequency part can be all devices made an appointment all identical sequences or different equipment is using different Sequence.One of which equipment finds that the form of signal only includes pilot portion.Wherein another equipment finds the form of signal Including leading part and message part, leading part is used for synchronization and/or channel estimation, and message part is used to carry to be sent out with equipment Existing related information, such as device identification of communication terminal 50, transimission power.As shown in fig. 7, wherein another equipment finds letter Number form include reference signal time slot and information transmission time slots, reference signal be used for synchronization and channel estimation, during information transfer Gap is used to carry the information related to equipment discovery, such as the device identification of communication terminal 50, transimission power.

Referring to Figure 12, communication terminal 50 further comprises：Judge module 52, search module 53, reset module 54, Beep-page message receiving module 56.Acquisition module 51 determines that the transmission equipment of communication terminal 50 finds the transfer resource of signal.

Judge module 52 determines whether that priority is higher and can not find that signal takes the transfer resource jointly with equipment Business take the transfer resource.If so, then entering search module 53, transmission time of the search module 53 in the transfer resource Another transfer resource of transmission equipment discovery signal is capable of in search in the first time predefined afterwards, wherein, first is fixed in advance The adopted time is for well known to all D2D communication terminals, and the first pre-defined time can not be oversize, can not be too short, typically The pre-defined time of selection first is no more than 8ms, it is preferred that this time is 4ms.Module 54 is reset to search in search module 53 During to another transmission time, by using the transmission time searched as the transmission time in transfer resource, its in transfer resource Remainder keeps constant.

If judge module 52 determine no priority it is higher and can not with equipment find signal take jointly the transmission money The business in source takes the transfer resource, then is directly entered transport module 55.The transmission equipment on the transfer resource of transport module 55 It was found that signal, wherein, transport module 55 can be used alone transmission money, can also be total to other business in communication terminal 50 It is same to use the transfer resource.

After beep-page message receiving module 56 is spaced the second time predefined after the transmission equipment of communication terminal 50 discovery signal, The beep-page message from another communication terminal 57 is received in pre-defined beep-page message transmission opportunity, wherein, second makes a reservation for The adopted time for well known to all D2D communication terminals, for example：5ms, the quantity of pre-defined beep-page message transmission opportunity is many It is individual, and each pre-defined beep-page message transmission opportunity carries a beep-page message.Beep-page message receiving module 56 exists Pre-defined beep-page message transmission opportunity receives the beep-page message from another communication terminal 57, and one of which is implemented Mode is：The pilot portion that beep-page message receiving module 56 is searched in beep-page message first in each transmission opportunity respectively, is used The beep-page message pilot frequency sequence that communication terminal 50 is locally stored is related to the pilot signal in beep-page message transmission opportunity, if Correlation is higher than predetermined value, then further, message part of the demodulating and decoding in this beep-page message, if successfully decoded, Then receive an effective beep-page message.Beep-page message includes pilot portion and message part, and message part includes second and led to Believe the device identification of terminal, the mark of the equipment for notifying initiation paging to the first communication terminal for receiving beep-page message, letter Breath part can also include the device identification of the first communication terminal and/or the transimission power of the second communication terminal, including first leads to The device identification of letter terminal can avoid other communication terminals for making the transfer resource send equipment discovery signal from responding the paging Message, including the transimission power of the second communication terminal can be used for transmission path estimation to be lost to select suitable code modulation mode And Power Control.

In embodiments of the present invention, acquisition module 51 is according to the information including the device identification of communication terminal 50, it is determined that The transfer resource of equipment discovery signal, and the transmission equipment discovery signal in the transfer resource of transport module 55, another side, separately One communication terminal 57 determines that the transmission equipment of communication terminal 50 finds letter also according to the information including the device identification of communication terminal 50 Number transfer resource, and receive in the transfer resource equipment and find signal.The communication terminal 50 that acquisition module 51 is determined is passed Transfer device finds that the transfer resource of signal is identical with the transfer resource that another communication terminal 57 is determined, and another communication terminal 57 is only Find that the equipment of the transfer resource search communication terminal 50 of signal finds signal in the transmission equipment of communication terminal 50 so that Ling Yitong Letter terminal 57 is without needing network-assisted can just realize the function of the communication terminal 50 in the range of discovering device to equipment communication.

The present invention provides a kind of embodiment of communication terminal again.As shown in figure 13.Communication terminal 60 includes processor 601 With antenna 602.Processor 601 is used for according to the information including the device identification of itself, determines setting in device-to-device communication The transfer resource of the existing signal of preparation, and signal is found by the transmission equipment of antenna 602 in the transfer resource.

Wherein, the above-mentioned processing procedure that processor 601 is performed can be completed by programme-control, and program deposits in memory In, when communication terminal needs to carry out aforesaid operations, program is called in into processor, is controlled to complete by processor.Certainly, above-mentioned place Reason process can also be to be completed by hardware.

The present invention provides a kind of communication terminal embodiment again.Figure 14 is referred to, Figure 14 is communication terminal the 3rd of the present invention The structural representation of embodiment.As illustrated, the communication terminal 70 includes determining module 71, acquisition module 72 and receives mould Block 73.Determining module 71 is used for the device identification for determining another communication terminal 75 to be searched.Wherein, another communication terminal 75 Device identification can be telephone number or the predefined mark distributed according to business function.Acquisition module 72 is according to another communication Information including the device identification of terminal 75, determines that another transmission equipment of communication terminal 75 finds the transfer resource of signal.Wherein, Acquisition module 72 is determined according to the device identification of another communication terminal 75 first in the method and first embodiment of transfer resource Communication terminal determines that the method for transfer resource is identical according to the device identification of itself, to locate no longer to repeat one by one.Of the invention real During Shi Fang is applied, equipment finds that the form of signal includes pilot portion and/or message part, and pilot portion can be located at information portion Point above leading before message part or middle reference signal either behind information after lead Part, one of which equipment finds that the form of signal only includes pilot portion.Wherein another equipment finds the form bag of signal Leading part and message part are included, leading part is used for synchronization and channel estimation, and message part is used to carry finds phase with equipment The information of pass, wherein another equipment find that the form of signal includes reference signal time slot and information transmission time slots.

Further, referring to Fig. 5, timing includes System Frame Number and system subframe number, for indicating each system The subframe timing when frame timing of the initial time of subframe and starting for indicating each frame of system.Communication terminal 70 can pass through Mobile radio communication, internet or GPS obtain timing.Acquisition module 72 again can be specifically for according to another communication terminal 75 Device identification and timing, determine that another transmission equipment of communication terminal 75 finds the transfer resource of signal.Wherein, mould is obtained Block 72 is determined in the method and first embodiment of transfer resource according to the device identification and timing of another communication terminal 75 First communication terminal is identical with the method that timing determines transfer resource according to the device identification of itself, no longer goes to live in the household of one's in-laws on getting married one by one herein State.

Receiving module 73 is in the first time predefined after the transfer resource or transfer resource that acquisition module 72 is determined Receive the equipment discovery signal that another communication terminal 75 is transmitted.First time predefined is for well known to all communication terminals.Connecing Receive after module 73 receives equipment discovery signal and be spaced after the second time predefined, sending module 74 selects a predefined paging Message transmission opportunity simultaneously sends beep-page message in the predefined beep-page message transmission opportunity.Wherein the second time predefined is institute Have well known to communication terminal, predefine the quantity of beep-page message transmission opportunity to be multiple, and each predefined beep-page message is passed Defeated chance carries a beep-page message.Beep-page message includes pilot portion and message part, and message part includes the second communication terminal Device identification, for receive beep-page message the first communication terminal notify initiate paging equipment mark, message part The device identification of the first communication terminal and/or the transimission power of the second communication terminal can also be included, it is to avoid others make the biography Defeated resource transmitting equipment finds that the communication terminal of signal responds the beep-page message and is lost to select for transmission path estimation Suitable code modulation mode and Power Control.

Communication terminal 70 further comprises beep-page message sending module 74, and beep-page message sending module 74 is in receiving module 73 Being spaced after the equipment discovery signal for receiving another communication terminal 75 after the second time predefined selects a predefined paging to disappear Transmission opportunity is ceased, and beep-page message is sent to another communication terminal 75 in the predefined beep-page message transmission opportunity.Wherein, in advance The beep-page message transmission opportunity of definition, the beep-page message transmission opportunity well known to communication terminal communicated for all participation D2D, and And the quantity of beep-page message transmission opportunity is multiple, it is to avoid multiple beep-page message transmission opportunity simultaneous selections one of communication terminal 70 Conflict caused by beep-page message transmission opportunity.Beep-page message includes pilot portion and message part.Pilot tone in beep-page message Part and equipment find that the sequence transmitted of pilot tone of signal can be with identical, can also be different.Then can be using identical sequence Implementation complexity is reduced to a certain extent.Erroneous judgement can be then avoided using different sequences.It is preferred that, the pilot tone portion of beep-page message Divide and equipment finds that the pilot portion of signal uses different sequences.The sequence of the pilot portion of the beep-page message of distinct device can , can also be different, it is preferred that the pilot portion of the beep-page message of all devices uses identical sequence with identical.Message part Include the device identification of communication terminal 70, for notifying the equipment for initiating paging to another communication terminal 75 for receiving beep-page message Mark, message part can also include another communication terminal 75 device identification and/or communication terminal 70 transimission power, bag Other communication terminal responses for making the transfer resource send equipment discovery signal can be avoided by including the device identification of communication terminal 70 The transimission power that the beep-page message includes another communication terminal 75 can be used for transmission path estimation to be lost to select suitable coding Modulation system carries out Power Control, interference control etc..

In embodiments of the present invention, the acquisition module 72 of communication terminal 70 is according to the device identification of another communication terminal 75 Information inside, determines that the transmission equipment of another communication terminal 75 finds the transfer resource of signal, receiving module 72 is in the transmission Another communication terminal 75 is received in resource transfer resource is determined according to the information including the device identification of itself, and in the transmission The equipment of resource transmission finds signal.The equipment that communication terminal 70 is determined finds the transfer resource and another communication terminal 75 of signal The equipment of determination finds that the transfer resource of signal is identical, and communication terminal 70 only finds to believe in another transmission equipment of communication terminal 75 Number transfer resource search for the equipment of another communication terminal 75 and find signal so that communication terminal 70 without need it is network-assisted can To realize the function of another communication terminal 75 in the range of discovering device to equipment communication.

The present invention provides a kind of communication terminal embodiment again.As shown in figure 15, the communication terminal 80 includes processor 801 and antenna 802.The information that processor 801 is used for including the device identification according to another communication terminal 81, determines another communication The transmission equipment of terminal 81 finds the transfer resource of signal, and equipment discovery signal is received in the transfer resource by antenna.

Wherein, the above-mentioned processing procedure that processor 801 is performed is typically to be completed by one section of programme-control, and program is deposited in In reservoir, when communication terminal needs to carry out above-mentioned action, program is called in into processor, is controlled to complete by processor.Certainly, on State processing procedure and can also be and completed by hardware.

The modules of communication terminal of the present invention, can be realized by hardware, can be realized by software.

Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair Equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills Art field, is included within the scope of the present invention.

Claims (24)

1. a kind of discovery method of communication terminal in device-to-device communication, it is characterised in that methods described includes：

First communication terminal determines that the equipment in device-to-device communication finds letter according to the information including the device identification of itself Number transfer resource, wherein, the transfer resource at least include transmission time；

First communication terminal determines whether that the higher business of priority takes the transfer resource, and the business is not It can find that signal takes the transfer resource jointly with equipment；

If the first communication terminal determines priority, higher business takes the transfer resource, first communication terminal In the first time predefined after the transfer resource, another transmission time of transmission equipment discovery signal is capable of in search, If searching out another transmission time, first communication terminal regard the transmission time searched as the transfer resource In transmission time, its remainder in the transfer resource keeps constant, and transmission equipment is sent out in the transfer resource with this Existing signal；

If the first communication terminal is determined takes the transfer resource without the higher business of priority, first communication is eventually Transmission equipment finds signal directly in the transfer resource at end.

2. according to the method described in claim 1, it is characterised in that the device identification is telephone number or is according to business The predefined mark of function distribution.

3. according to the method described in claim 1, it is characterised in that the transfer resource is transmission time, or transfer resource Combination at least one in transmission frequency, transmission code and transmission beam direction with transmission time.

4. according to the method described in claim 1, it is characterised in that first communication terminal exists according to the device identification of itself Interior information, determines that the step of equipment in device-to-device communication finds the transfer resource of signal is specially:

Device identification and timing of first communication terminal according to itself, determine the equipment hair in device-to-device communication The transfer resource of existing signal, wherein, timing includes：The System Frame Number at current time, system subframe number, for indicating system The frame timing of the initial time of each frame and for the subframe timing for the initial time for indicating system subframe.

5. according to the method described in claim 1, it is characterised in that the transfer resource is obtained by following calculation:

S=D_UE_ID mod N

S is the numbering of the transfer resource, and D_UE_ID is the device identification of the first communication terminal, and N is the sum of transfer resource, Found to the transmission period of signal as the first communication terminal transmission equipment, by this transmission period periodic a period of time Be arranged to Nt sub- transmission periods, and in this transmission period, by frequency band be arranged to Nf transmission frequencies section and/or It is provided with Nc transmission code and/or spatial domain and is provided with Nb transmission beam direction, Nt, Nf, Nc and Nb is whole more than zero Number, a sub- transmission period as a transfer resource, or a sub- transmission period and a sub- transmission frequency section, one The combination of at least one is as a transfer resource in transmission code and a transmission Shu Fangxiang, and N is equal to Nt, or N be equal to Nt with The product of at least one in Nf, Nc and Nb, each transfer resource is provided with unduplicated numbering, and number with 0~N-1 it Between integer it is corresponding.

6. according to the method described in claim 1, it is characterised in that methods described further comprises：

After the second time predefined is spaced after the first communication terminal transmission equipment finds signal, the first communication terminal is pre- The beep-page message for other communication terminals searched in the beep-page message transmission opportunity first defined beyond the first communication terminal, its In, the quantity of pre-defined beep-page message transmission opportunity is at least one and one predefined beep-page message transmission opportunity and held Carry a beep-page message.

7. a kind of discovery method of communication terminal in device-to-device communication, it is characterised in that：

Second communication terminal determines the device identification of the first communication terminal to be searched；

Second communication terminal determines first communication according to the information including the device identification of first communication terminal Terminal transmission equipment finds the transfer resource of signal, wherein, the transfer resource at least includes transmission time；

Second communication terminal finds the transfer resource or described first of signal in the first communication terminal transmission equipment Communication terminal transmission equipment finds to receive first communication terminal in the first time predefined after the transfer resource of signal Equipment finds signal, wherein, determine the higher business of priority in first communication terminal and take the transfer resource When, first communication terminal is in the first time predefined after the transfer resource, and search being capable of transmission equipment discovery Another transmission time of signal, and when searching out another transmission time, using the transmission time searched as described Its remainder in transmission time, the transfer resource in transfer resource keeps constant, and sends second communication terminal to.

8. method according to claim 7, it is characterised in that the device identification is telephone number or is according to business The predefined mark of function distribution.

9. method according to claim 7, it is characterised in that the transfer resource is transmission time, or transfer resource Combination at least one in transmission frequency, transmission code and transmission beam direction with transmission time.

10. method according to claim 7, it is characterised in that：Second communication terminal is whole according to the described first communication Information including the device identification at end, determines that the step of the first communication terminal transmission equipment finds the transfer resource of signal has Body is：

Device identification and timing of second communication terminal according to first communication terminal, determine the first communication terminal Transmission equipment finds the transfer resource of signal, and wherein timing includes：The System Frame Number at current time, system subframe number, refer to The subframe timing of the frame timing for showing the initial time of each frame of system and the initial time for indicating system subframe.

11. method according to claim 7, it is characterised in that the transfer resource is obtained by following calculation:

S=D_UE_ID mod N

S is the numbering of the transfer resource, and D_UE_ID is the device identification of the first communication terminal, and N is the sum of transfer resource, Found to the transmission period of signal as the first communication terminal transmission equipment, by this transmission period periodic a period of time Be arranged to Nt sub- transmission periods, and in this transmission period, by frequency band be arranged to Nf transmission frequencies section and/or It is provided with Nc transmission code and/or spatial domain and is provided with Nb transmission beam direction, Nt, Nf, Nc and Nb is whole more than zero Number, a sub- transmission period is used as a transfer resource, or a sub- transmission frequency section, a transmission code and a transmission beam The combination of at least one in direction and a sub- transmission period determines a transfer resource, and N is equal to Nt, or N be equal to Nt and Nf, The product of at least one in Nc and Nb, each transfer resource is provided with unduplicated numbering.

12. method according to claim 7, it is characterised in that methods described further comprises：

Second communication terminal after the equipment for receiving the first communication terminal finds signal after the second time predefined is spaced A predefined beep-page message transmission opportunity is selected, and transmission paging disappears in the predefined beep-page message transmission opportunity Cease to the first communication terminal, wherein, the quantity of pre-defined beep-page message transmission opportunity is at least one, and one makes a reservation for Adopted beep-page message transmission opportunity carries a beep-page message.

13. a kind of communication terminal, it is characterised in that the communication terminal includes：

Acquisition module, for the information including the device identification according to the communication terminal, is determined in device-to-device communication Equipment finds the transfer resource of signal, and the transfer resource at least includes transmission time；

Judge module, after determining transfer resource in acquisition module, determines whether that the higher business of priority takes institute Transfer resource is stated, and the business can not find that signal takes the transfer resource jointly with equipment；

Search module, for when judge module determines the higher business of priority and takes the transfer resource, described Another transfer resource of transmission equipment discovery signal is capable of in search in the first time predefined after transfer resource；

Reset module, for when search module searches another transfer resource, by it is described search can transmission equipment send out Transmission time in another transfer resource of existing signal is as the transmission time of the transfer resource, its in the transfer resource Remainder keeps constant；

Transport module, signal is found for transmitting the equipment after the replacement resume module in the transfer resource.

14. communication terminal according to claim 13, it is characterised in that the transfer resource is transmission time, Huo Zhechuan Combination of the defeated resource at least one in transmission frequency, transmission code and transmission beam direction with transmission time.

15. communication terminal according to claim 13, it is characterised in that：

The acquisition module determines that transmission equipment is found specifically for the device identification according to the communication terminal and timing The transfer resource of signal, the timing includes：The System Frame Number at current time, system subframe number, for indicating that system is every The frame timing of the initial time of one frame and for the subframe timing for the initial time for indicating system subframe.

16. communication terminal according to claim 13, it is characterised in that the transfer resource passes through following calculation Obtain:

S=D_UE_ID mod N

S is the numbering of the transfer resource, and D_UE_ID is the device identification of the first communication terminal, and N is the sum of transfer resource, Found to the transmission period of signal as the first communication terminal transmission equipment, by this transmission period periodic a period of time Be arranged to Nt sub- transmission periods, and in this transmission period, by frequency band be arranged to Nf transmission frequencies section and/or It is provided with Nc transmission code and/or spatial domain and is provided with Nb transmission beam direction, Nt, Nf, Nc and Nb is whole more than zero Number, a sub- transmission period is used as a transfer resource, or a sub- transmission frequency section, a transmission code and a transmission beam The combination of at least one in direction and a sub- transmission period determines a transfer resource, and N is equal to Nt, or N be equal to Nt and Nf, The product of at least one in Nc and Nb, each transfer resource is provided with unduplicated numbering.

17. the communication terminal according to claim 13, it is characterised in that：The communication terminal further comprises：Beep-page message Receiving module；

The beep-page message receiving module is used for when interval second is predefined after the transport module transmission equipment finds signal Between after, seeking for other communication terminals beyond the first communication terminal is received in pre-defined beep-page message transmission opportunity Message is exhaled, wherein the quantity of the pre-defined beep-page message transmission opportunity is at least one, and one pre-defined Beep-page message transmission opportunity carries a beep-page message.

18. a kind of communication terminal, it is characterised in that the communication terminal includes processor and antenna；

The processor is used for according to the information including the device identification of itself, determines that the equipment in device-to-device communication is found The transfer resource of signal, the transfer resource at least includes transmission time；

The processor is additionally operable to determine whether that the higher business of priority takes the transfer resource, and the business is not It can find that signal takes the transfer resource jointly with equipment；

If determining the higher business of priority takes the transfer resource, the processor is after the transfer resource The first time predefined in, search be capable of transmission equipment find signal another transmission time, if searching out another transmission Time, remaining using the transmission time searched as the transmission time in the transfer resource, in the transfer resource Keep it is constant, and in the transfer resource pass through the antenna transmission equipment find signal；

If the processor is determined takes the transfer resource without the higher business of priority, in the transfer resource Signal is found by the antenna transmission equipment.

19. a kind of communication terminal, it is characterised in that the communication terminal includes：

Determining module, the device identification for determining another communication terminal to be searched；

Acquisition module, for the information including the device identification according to another communication terminal, determines that another communication terminal is passed Transfer device finds the transfer resource of signal, wherein, the transfer resource at least includes transmission time；

Receiving module, for being set described in reception in the first time predefined after the transfer resource or the transfer resource The existing signal of preparation, wherein, when another communication terminal determines the higher business of priority and takes the transfer resource, Another communication terminal is in the first time predefined after the transfer resource, and search being capable of transmission equipment discovery signal Another transmission time, and when searching out another transmission time, regard the transmission time searched as the transmission Its remainder in transmission time, the transfer resource in resource keeps constant, and sends the communication terminal to.

20. communication terminal according to claim 19, it is characterised in that：

The transfer resource be transmission time, or transfer resource be transmission frequency, transmission code and transmission beam direction in extremely Lack the combination of one and transmission time.

21. communication terminal according to claim 19, it is characterised in that：

The acquisition module determines another communication terminal specifically for the device identification according to another communication terminal and timing Transmission equipment finds the transfer resource of signal, and the timing includes：The System Frame Number at current time, system subframe number, refer to The subframe timing of the frame timing for showing the initial time of each frame of system and the initial time for indicating system subframe.

22. communication terminal according to claim 20, it is characterised in that the transfer resource passes through following calculation Obtain:

S=D_UE_ID mod N

S is the numbering of the transfer resource, and D_UE_ID is the device identification of the first communication terminal, and N is the sum of transfer resource, Found to the transmission period of signal as the first communication terminal transmission equipment, by this transmission period periodic a period of time Be arranged to Nt sub- transmission periods, and in this transmission period, by frequency band be arranged to Nf transmission frequencies section and/or It is provided with Nc transmission code and/or spatial domain and is provided with Nb transmission beam direction, Nt, Nf, Nc and Nb is whole more than zero Number, a sub- transmission period is transmitted in Shu Fangxiang extremely as a transfer resource, or a sub- transmission frequency section, a transmission code and one The combination for lacking one and a sub- transmission period determines a transfer resource, and N is equal to Nt, or N is equal in Nt and Nf, Nc and Nb extremely Few one product, each transfer resource is provided with unduplicated numbering.

23. communication terminal according to claim 20, it is characterised in that the communication terminal further comprises：Paging disappears Sending module is ceased, is found for receiving equipment in receiving module after signal after the second time predefined, selects one to predefine Beep-page message transmission opportunity simultaneously sends beep-page message in the predefined beep-page message transmission opportunity, wherein, described predefine is sought The quantity of message transmission opportunity is exhaled to be at least one, and a predefined beep-page message transmission opportunity can carry a paging and disappear Breath.

24. a kind of communication terminal, it is characterised in that the communication terminal includes processor and antenna；

The information that the processor is used for including the device identification according to another communication terminal, determines that another communication terminal transmission is set The transfer resource of the existing signal of preparation, the transfer resource at least includes transmission time, and by antenna in the transfer resource Receive the equipment and find signal, wherein, determine the higher business occupancy of priority in another communication terminal described During transfer resource, another communication terminal is in the first time predefined after the transfer resource, and search can be transmitted Equipment finds another transmission time of signal, and when searching out another transmission time, by the transmission time searched Keep constant as its remainder in the transmission time in the transfer resource, the transfer resource, and send the communication to Terminal.