CN103997788A

CN103997788A - Device discovery method, user equipment, and network side equipment used for device-to-device communication

Info

Publication number: CN103997788A
Application number: CN201310052679.4A
Authority: CN
Inventors: 吴栓栓; 梁枫; 戴博; 张峻峰
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2013-02-18
Filing date: 2013-02-18
Publication date: 2014-08-20
Anticipated expiration: 2033-02-18
Also published as: WO2014124608A1; CN103997788B

Abstract

The invention discloses a device discovery method, user equipment and network side equipment used for device-to-device communication, and relates to the field of wireless communication. The disclosed method includes the following steps: user equipment receives device discovery first configuration signaling sent by network side equipment; the user equipment determines device discovery resources used for device discovery signal transmission according to the first configuration signaling, and performing device discovery through the device discovery resources; and the first configuration signaling being sent in the form of broadcasting and at least including one or more of the following parameters: a time domain wireless resource configuration parameter used for indicating discovery of a frame and/or subframe by the device, a frequency domain wireless resource configuration parameter used for indicating discovery of a frequency band position by the device, and a sequence configuration parameter used for indicating discovery of a signal sequence by the device. The invention also discloses user equipment and network side equipment. The technical scheme of the application solves the problem of device discovery of device-to-device communication in a cellular communication system.

Description

The method for discovering equipment of communicating by letter for device-to-device and subscriber equipment, network equipment

Technical field

The present invention relates to wireless communication field, relate in particular to the device discovery that is applied to device-to-device communication in cellular radio Communication system.

Background technology

Cellular communication, owing to having realized multiplexing to limited frequency spectrum resource, has obtained wireless communication technology flourish.In cellular communication system, as two subscriber equipment (User Equipment, referred to as UE) between have business when transmission, subscriber equipment 1 (UE1) is to the business datum of subscriber equipment 2 (UE2), can first be transferred to base station (the Base Station of community, UE1 place by eating dishes without rice or wine, or be called Node B, evolved Node B, eNB), this base station by core net by this user data transmission the base station to community, UE2 place, this base station is transferred to above-mentioned business datum UE2 again by eating dishes without rice or wine.UE2 adopts similar handling process to the business data transmission of UE1.

Obviously,, when these two subscriber equipmenies are when nearer, this communication means is not optimum.For example, and in fact, along with the variation of mobile communication business,, social networks, E-Payment etc. is applied in universal in wireless communication system, make that closely the transmission of the business between user demand is growing.Therefore, the communication pattern of device-to-device (Device-to-Device, referred to as D2D) is subject to extensive concern day by day.So-called D2D, refers to the forwarding of business datum without base station and core net, is directly transferred to target UE by eating dishes without rice or wine by source user equipment.This communication pattern is different from the communication pattern of conventional cellular systems.For the user of short-range communication, D2D has not only saved radio spectrum resources, and has reduced the transfer of data pressure of core net.

In cellular communication, in the time that two UE communicate, generally UE self is without the position of knowing the other side UE, but for example, sets up the connection of two UE by network equipment (base station or equipment of the core network).And for device-to-device communication, the prerequisite establishing a communications link is the mutual discovery between UE, also can be referred to as device-to-device and finds or device discovery.But, for the device-to-device communication that is applied to cellular communication system, due to needs and cellular communication share spectrum resources, when device discovery and the interference problem of cellular communication just need to scrutinize, avoid device discovery and cellular communication to produce and disturb, and ensure further the efficiency of device discovery.

Summary of the invention

Technical problem to be solved by this invention is, provides a kind of method for discovering equipment of device-to-device communication and subscriber equipment, network equipment, to improve the reliability of device-to-device communication.

In order to solve the problems of the technologies described above, the invention discloses a kind of method for discovering equipment for device-to-device communication, comprising:

Subscriber equipment receives device discovery the first configuration signal that network equipment sends;

Described subscriber equipment is identified for the device discovery resource of device discovery signal transmission according to described the first configuration signal, and carries out device discovery by described device discovery resource;

Wherein, described the first configuration signal sends with the form of broadcast, at least comprises following one or more parameters:

Be used to indicate the time domain radio resource configuration parameters of device discovery frame and/or subframe;

Be used to indicate the frequency domain radio resource configuration parameters of device discovery frequency band position;

Be used to indicate the sequence configuration parameter of device discovery burst.

Preferably, in said method, described time domain radio resource configuration parameters comprises:

Indicating equipment is found the parameter of time-domain resource cycle, radio frames skew, subframe position, and described subscriber equipment is identified for the time-domain resource of device discovery according to described parameter; Or,

Indicating equipment is found the parameter of time-domain resource cycle, subframe skew, and described subscriber equipment is identified for the time-domain resource of device discovery according to described parameter; Or,

Indicating equipment is found the parameter of time-domain resource cycle, subframe position, and described subscriber equipment is identified for the time-domain resource of device discovery according to described parameter; Or,

Indicating equipment is found the parameter of subframe position, and described subscriber equipment is identified for the time-domain resource of device discovery according to described parameter.

Preferably, in said method, described frequency domain radio resource configuration parameters one in the following manner represents:

Predefined frequency domain resource configuration index; Or,

Based on the resource allocation parameters of the defined frequency domain resource piece of the Long Term Evolution LTE system method of salary distribution; Or,

For representing the parameter that frequency domain resource is initial.

Preferably, in said method, described subscriber equipment is identified for the device discovery resource of device discovery signal transmission according to described the first configuration signal, comprising:

Described subscriber equipment according to default rule in described device discovery resource determine discovery signals sending time slots, and in described sending time slots transmitting apparatus discovery signals, described default rule comprises:

Described subscriber equipment is the random time slot transmitting apparatus discovery signals of selecting in described time-domain resource; Or,

Described subscriber equipment is determined a time slot within the described time-domain resource cycle, transmitting apparatus discovery signals in described time slot, and described definite mode is random selection; Or,

Described subscriber equipment is determined the transmission cycle of discovery signals, and according to described transmission cycle transmitting apparatus discovery signals, wherein, the described transmission cycle is the integral multiple in described time domain public resource cycle; Or,

Described subscriber equipment, according to customer equipment identification and according to the sending time slots of the formula calculating discovery signals of agreement, sends discovery signals in described sending time slots.

Preferably, in said method, the frequency domain resource that described subscriber equipment sends described device discovery signal is the indicated frequency band of described the first configuration signal frequency domain radio resource configuration parameters.

Described subscriber equipment is checkout equipment discovery signals in described device discovery resource, finds target UE by described detection.

Preferably, said method also comprises:

Described subscriber equipment receives device discovery the second configuration signal that described network equipment sends, and be identified for the user equipment specific resource that device discovery signal transmits, transmitting apparatus discovery signals in described private resource according to described the first configuration signal and described the second configuration signal;

Wherein, described the second configuration signal at least comprises following one or more parameters:

Be used to indicate the device discovery frame of user equipment specific and/or the time domain radio resource configuration parameters of subframe;

Be used to indicate the frequency domain radio resource configuration parameters of the device discovery frequency band position of user equipment specific;

Be used to indicate the sequence configuration parameter of the device discovery burst of user equipment specific;

Be used to indicate the power contorl parameters of the device discovery signal transmitting power of user equipment specific.

Preferably, in said method, the time domain radio resource configuration parameters in described the second configuration signal at least comprises following one or more parameters:

Device discovery resource cycle, the radio frames that is used to indicate user equipment specific is offset, the parameter of subframe position;

Be used to indicate the device discovery period of sub-frame of user equipment specific, the parameter of subframe skew.

Preferably, in said method:

Described the second configuration signal is high-level signaling, by special RRC signaling bear; Or,

Described the second configuration signal is physical layer signaling, by Downlink Control Information or Physical Downlink Shared Channel carrying.

Preferably, said method also comprises:

Described subscriber equipment receives device discovery the second configuration signal that described network equipment sends, determine the transmission of device discovery signal or detect time slot according to described the first configuration signal and described the second configuration signal, in described time slot, sending or detect described device discovery signal;

Wherein, described the second configuration signal is used for triggering described subscriber equipment and sends or checkout equipment discovery signals, at least comprises following one or more parameters:

Be used to indicate the trigger parameter that subscriber equipment carries out the transmission of device discovery signal or detection;

Be used to indicate the parameter that device discovery signal sends the cycle;

Be used to indicate the indication parameter of device discovery signal transmission times or duration;

Be used to indicate the device discovery signal indexing parameter of device discovery burst;

Preferably, in said method, described the second configuration signal is physical layer signaling, by Downlink Control Information or Physical Downlink Shared Channel carrying.

Preferably, in said method:

Described Radio Resource distributes in the upstream band of FDD system; Or,

Described Radio Resource distributes in the sub-frame of uplink of TDD system; Or,

Described Radio Resource configures in dedicated frequency band, and described dedicated frequency band refers to that described frequency band is exclusively used in device-to-device communication.

The method for discovering equipment that the invention also discloses a kind of device-to-device communication, comprising:

Network equipment is found the first configuration signal to subscriber equipment transmitting apparatus, and described the first configuration signal is configured for the device discovery resource of device discovery signal transmission, and described subscriber equipment carries out device discovery by described device discovery resource;

Wherein, described the first configuration signal at least comprises following one or more parameters:

Preferably, said method also comprises:

Described network side sends the second configuration signal of the user equipment specific resource for determining the transmission of device discovery signal to subscriber equipment;

Preferably, said method also comprises:

Described network side sends the second configuration signal for triggering described subscriber equipment transmission or checkout equipment discovery signals to subscriber equipment;

Be used to indicate the triggering indication parameter that subscriber equipment carries out the transmission of device discovery signal or detection;

Be used to indicate the parameter that device discovery signal sends the cycle;

Be used to indicate subscriber equipment transmitting apparatus discovery signals number of times or the indication parameter of duration;

Be used to indicate the device discovery signal indexing parameter of described device discovery burst;

The invention also discloses a kind of subscriber equipment, comprising:

First communication module, receives device discovery the first configuration signal that network equipment sends, and wherein, described the first configuration signal at least comprises following one or more parameters:

Be used to indicate the sequence configuration parameter of device discovery burst;

Resource determination module, is identified for according to described the first configuration signal the device discovery resource that device discovery signal transmits;

Second communication module, by described device discovery resource transmitting equipment discovery signals or checkout equipment discovery signals, wherein, described device discovery signal is for the device discovery of device-to-device communication.

Preferably, in above-mentioned subscriber equipment, described resource determination module is identified for the device discovery resource of device discovery signal transmission according to described the first configuration signal, comprising:

Described resource determination module is determined discovery signals sending time slots in described device discovery resource according to default rule, wherein, described default rule comprises:

The random time slot of selecting for the transmission of device discovery signal in described time-domain resource; Or,

Within the described time-domain resource cycle, determine that a time slot sends for device discovery signal, determined mode is random selection; Or,

Determine the transmission cycle of discovery signals, and within the described transmission cycle, determine the transmission of a time slot for device discovery signal, wherein, the described transmission cycle is the integral multiple in described time domain public resource cycle; Or,

According to customer equipment identification and according to the sending time slots of the formula calculating discovery signals of agreement.

Preferably, in above-mentioned subscriber equipment, the frequency domain resource that sends described device discovery signal is the indicated frequency band of described the first configuration signal frequency domain radio resource configuration parameters.

Preferably, in above-mentioned subscriber equipment, described second communication module is checkout equipment discovery signals in described device discovery resource, finds target UE by described detection.

Preferably, in above-mentioned subscriber equipment, described first communication module, device discovery the second configuration signal also sending for receiving described network equipment, wherein, described the second configuration signal at least comprises following one or more parameters:

Be used to indicate the power contorl parameters of the device discovery signal transmitting power of user equipment specific;

Described resource determination module, is identified for according to described the first configuration signal and described the second configuration signal the user equipment specific resource that device discovery signal transmits;

Described second communication module, transmitting apparatus discovery signals in described private resource.

Preferably, in above-mentioned subscriber equipment:

Described first communication module, also for receive that described network equipment sends for triggering, subscriber equipment sends or device discovery second configuration signal of checkout equipment discovery signals, wherein, described the second configuration signal at least comprises following one or more parameters:

Be used to indicate the parameter that device discovery signal sends the cycle;

Described resource determination module, determines the transmission of device discovery signal or detects time slot according to described the first configuration signal and described the second configuration signal;

Described second communication module sends or detects described device discovery signal in described time slot.

The invention also discloses a kind of network equipment, comprising:

Resource distribution module, configuration device discovery resource also generates device discovery the first configuration signal, and wherein, described the first configuration signal at least comprises following one or more parameters:

Communication module, sends described device discovery the first configuration signal with the forms of broadcasting.

Preferably, in above-mentioned network equipment, described time domain radio resource configuration parameters comprises:

Preferably, in above-mentioned network equipment, described frequency domain radio resource configuration parameters one in the following manner represents:

Predefined frequency domain resource configuration index; Or,

Frequency domain resource initial parameters.

Preferably, in above-mentioned network equipment:

Described resource distribution module, sends after described the first configuration signal in described communication module, is also configured for the user equipment specific resource of device discovery and generates the second configuration signal;

Described communication module, sends described the second configuration signal to subscriber equipment, and wherein, described the second configuration signal at least comprises following one or more parameters:

Preferably, in above-mentioned network equipment, the time domain radio resource configuration parameters in described the second configuration signal at least comprises following one or more parameters:

Preferably, in above-mentioned network equipment,

Preferably, in above-mentioned network equipment, described resource distribution module, send after described the first configuration signal in described communication module, also generate the second configuration signal that triggers described subscriber equipment transmission or checkout equipment discovery signals, wherein, described the second configuration signal at least comprises following one or more parameters:

Be used to indicate the parameter that device discovery signal sends the cycle;

Described communication module, sends described the second configuration signal to described subscriber equipment.

Preferably, in above-mentioned network equipment, described the second configuration signal is physical layer signaling, by Downlink Control Information or Physical Downlink Shared Channel carrying.

Preferably, in above-mentioned network equipment,

Described Radio Resource distributes in the upstream band of FDD system; Or,

Present techniques scheme has solved the device discovery problem of device-to-device communication in cellular communication system, not only avoid producing and disturbing between the device discovery of device-to-device communication and cellular communication, also ensure the efficiency of device discovery, contributed to improve the popularity of device-to-device communications applications.

Embodiment

Fig. 1 is LTE/LTE-A system wireless frame structure schematic diagram;

Fig. 2 is LTE/LTE-A system physical resource structural representation;

Fig. 3 is the network design schematic diagram of cellular radio Communication system;

Fig. 4 is a kind of wireless frame structure schematic diagram that embodiment 1 proposes;

Fig. 5 is the another kind of wireless frame structure schematic diagram that embodiment 1 proposes;

Fig. 6 is the third wireless frame structure schematic diagram that embodiment 1 proposes;

Fig. 7 is wireless frame structure schematic diagram in a kind of execution mode of embodiment 4;

Fig. 8 is wireless frame structure schematic diagram in execution mode in another of embodiment 4;

Fig. 9 is the structural representation of the subscriber equipment that provides of embodiment 6;

Figure 10 is the structural representation of the network equipment that provides of embodiment 7;

Figure 11 is the structural representation of the network equipment that provides of embodiment 8.

Embodiment

For making the object, technical solutions and advantages of the present invention clearer, below in connection with accompanying drawing, technical solution of the present invention is described in further detail.It should be noted that, in the situation that not conflicting, the feature in the application's embodiment and embodiment can combine arbitrarily mutually.

The techniques described herein are applicable to cellular radio Communication system or network.Common cellular radio Communication system can be based on CDMA (Code Division Multiplexing Access, code division multiple access) technology, FDMA (Frequency Division Multiplexing Access, frequency division multiple access) technology, OFDMA (Orthogonal-FDMA, OFDM) technology, SC-FDMA (Single Carrier-FDMA, single-carrier frequency division multiple access) technology, etc.For example, 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution, Long Term Evolution)/LTE-A (LTE-Advanced, senior Long Term Evolution) cellular communication system down link (or being called forward link) is based on OFDMA technology, and up link (or being called reverse link) is based on SC-FDMA multiple access technology.Multiple access technology following that likely support mixes on a link.

In OFDMA/SC-FDMA system, when wireless communication resources is-form of bidimensional frequently.For example, for LTE/LTE-A system, the communication resource of uplink and downlink link is all to divide taking radio frames (radio frame) as unit on time orientation, each radio frames (radio frame) length is 10ms, comprise the subframe that 10 length are 1ms (sub-frame), each subframe comprises that length is two time slots (slot) of 0.5ms, as shown in Figure 1.And according to the configuration difference of Cyclic Prefix (Cyclic Prefix, CP), each time slot can comprise 6 or 7 OFDM or SC-FDM symbol.

In frequency direction, resource is divided taking subcarrier (subcarrier) as unit, specifically in communication, the least unit that frequency domain resource is distributed is RB (Resource Block, Resource Block), a PRB (Physical RB, Physical Resource Block) of corresponding physical resource.A PRB comprises 12 subcarriers (sub-carrier) at frequency domain, corresponding to a time slot (slot) of time domain.On each OFDM/SC-FDM symbol, the resource of a corresponding subcarrier is called Resource Unit (Resource Element, RE).As shown in Figure 2.

In LTE/LTE-A cellular communication, user equipment (UE) is found LTE network by detecting synchronizing signal (Synchronization Signal, SS).Synchronizing signal includes master sync signal (Primary SS, PSS) and auxiliary synchronous signals (Secondary SS, SSS).By detecting synchronizing signal, UE obtains downstream frequency and the time synchronized with base station.And, because synchronizing signal carries Physical Cell Identifier, detect synchronizing signal and also mean that UE finds LTE/LTE-A community.

In up link, in the time that UE has transmitting uplink data, need to initiate random access (Random Access, RA) carry out uplink synchronous and set up RRC (Radio Resource Control, RRC) connect, enter RRC from RRC free time (Idle) state and connect (Connected) state.When random access, UE need to send random access guiding (preamble), and network side is by detecting random access guiding in specific running time-frequency resource, realizes the synchronous of identification to UE and up link.

Figure 3 shows that the network design schematic diagram of cellular radio Communication system.Shown in figure, can be 3GPP LTE/LTE-A system, or other cellular radio Communication technology.In the Access Network of cellular radio Communication system, the network equipment generally comprises base station (the base station of some, or be called Node B, Node B, or the Node B of evolution, evolved Node B, eNB, or the Node B strengthening, enhanced Node B,, and other network entity (network entity) eNB).Or, in short, also can be referred to as network side E-UTRAN (Evolved Universal Terrestrial Radio Access Network, the universal terrestrial access network of evolution).Here said base station also comprises the low power nodes (Low Power Node, LPN) in network, and for example Femto cell or Home eNodeB (pico, Relay, femto, HeNB is Home eNB etc.).Simple for describing, in Fig. 3, only show 3 base stations.Base station provides certain wireless signal coverage, and terminal in this coverage (terminal, or be called subscriber equipment, User Equipment, UE, or device) can carry out radio communication with this base station.The wireless signal overlay area of a base station may be divided into one or more community cell or sector sector based on some criterion, for example may Shi Sange community, the radio communication of each community may have independently subsystem and process, for example radio frequency unit independently.

Carry out the device discovery of device-to-device communication in cellular communication system time, due to the Radio Resource of device discovery use cellular network, device discovery procedure may need the auxiliary of network side, by the auxiliary of network, device discovery is managed, avoid device discovery that cellular communication is produced and disturbed, and pass through the efficiency of the auxiliary raising device discovery of network.The network entity that Radio Resource is managed is generally base station, for example, can be used for by base station assigns the Radio Resource of device discovery, and the UE that carries out the device discovery of device-to-device communication sends or checkout equipment discovery signals in this Radio Resource.Or the distribution of above-mentioned Radio Resource can be also that carry out according to the instruction of upper layer network entity base station.

Concrete, the method for discovering equipment based on above-mentioned consideration comprises:

Subscriber equipment receives device discovery the first configuration signal that network side sends; Described subscriber equipment is identified for the device discovery resource of device discovery signal transmission according to described the first configuration signal, and carries out device discovery by described device discovery resource.Wherein, described the first configuration signal sends with the form of broadcast, comprise following one of at least: the time domain radio resource configuration parameters that is used to indicate device discovery frame and/or subframe; Be used to indicate the frequency domain radio resource configuration parameters of device discovery frequency band position; Be used to indicate the sequence configuration parameter of device discovery burst.

Below in conjunction with practical application, describe the implementation procedure of said method in detail.

Embodiment 1

In the first configuration signal, may comprise the time domain radio resource configuration parameters that is used to indicate device discovery frame and/or subframe, carry out the configuration of device discovery time-domain resource by this parameter.

Can be used in by time-domain resource cycle, radio frames skew point the radio frames of device discovery.For example, can define equipment find assignment period (Period) and the radio frames allocation offsets (Offset) of radio frames, as System Frame Number (the System Frame Number of radio frames, SFN) while meeting SFN mod Period=Offset, represent that this radio frames is the radio frames for device discovery, mod represents modulo operation.Such as, assignment period can be configurable, such as being 1,2,4,8,16,32,64, etc., allocation offsets can be configurable, such as being 0/1/2/3/4/5/6/7, etc.; Or assignment period can be arranged, such as 16, or 32, allocation offsets can be configurable, such as being 0-16, or 0-32, etc.It should be noted that, the numeral is here all for example, is not construed as limiting the invention.Above-mentioned digital value can be got any integer value in System Frame Number Serial Number Range.

By the aforesaid cycle, be offset configurable device discovery radio frames, in radio frames, configuration device is found subframe again, such as representing to be configured in radio frames by the form of bitmap the subframe of device discovery resource, the bitmap that can be for example m bit represents the device discovery subframe configuring in a radio frames, m is the maximum number of sub frames that can be configured to device discovery subframe in a radio frames, such as being 5 or 6 or 10; Or can multiple radio frames be also that base unit configuration device is found subframe, for example 2 or 4 or 8 or 16 or 32 radio frames are basic time unit, now the size of bitmap is respectively 2m, 4m, 8m, 16m and 32m bit, and m implication is the same.It should be noted that equally, 2/4/8/16/32 is all for example here, is not construed as limiting.To sum up can realize the configuration of device discovery time domain public resource.

An example as shown in Figure 4.The time-domain resource cycle that the first configuration signal configures is 4, represents that the time-domain resource cycle is 4 radio frames; The radio frames skew configuring is 1, represents that the radio frames that meets SFN mod4=1 is configured to device discovery radio frames; Bitmap is 0000001000, and indication equipment is found to be numbered in radio frames 6 subframe and is configured to device discovery subframe.

In another example, the time-domain resource cycle is the same with skew, but bitmap is 100000, and indication equipment finds that the subframe of the be configured to device discovery subframe that is numbered 1 in radio frames is configured to device discovery subframe.Such as, in TDD system, the subframe that can be configured to device discovery subframe is sub-frame of uplink, and in TDD system, the maximum set of sub-frame of uplink numbering is 2/3/4/7/8/9 (subframe numbering 0-9), and above-mentioned bitmap represents to number 2 subframe and is configured to device discovery subframe.

Or time-domain resource is configured by the mode of instruction cycle, subframe skew.For example, the assignment period (Period) of can define equipment finding resource, this assignment period can be found for indication equipment recurrence interval or the time of resource, for example assignment period can radio frames be unit, can be configured to 1,2,4,8,16,32, etc., indication equipment is found 1 or 2 or 4 of resource respectively ... radio frames repeats once.Assignment period can other times unit be also that unit is configured, such as being configured taking n radio frames as unit, (n is as being more than or equal to 1 integer, such as n=4), can be configured to 1,2,3,4, etc., indication equipment finds that the repetition period of resource is n, 2n respectively, 3n, 4n... radio frames; Or can subframe be also that unit is configured, for example, can be configured to 5,10,20,40,80,160, etc., indication equipment finds that the repetition period of resource is 5,10,20,40 respectively, 80,160 subframes.

This time-domain resource configures subframe skew (Offset) parameter comprising and is used to indicate concrete subframe position in time-domain resource assignment period.For example, subframe skew can be configured to 0/1/2/3/4/..., represents that respectively in time-domain resource assignment period, 1/2/3/4/5/... subframe is configured to device discovery resource.It should be noted that, the numeral is here all for example, is not construed as limiting the invention.

For example, find the resource cycle taking subframe as unit configuration device, an example determining concrete subframe position with subframe skew as shown in Figure 5.Under this configuration mode, in the time that subframe numbers (Subframe Number, SN) meets (SFN*10+SN) mod Period=Offset, represent that this subframe is configured to device discovery subframe.In Fig. 5, the cycle Period of the device discovery resource that the first configuration signal configures is 320 milliseconds, i.e. 320 subframes; Subframe skew Offset is 83, can determine that device discovery subframe is as shown in blue subframe in Fig. 5 based on this.

Or above-mentioned subframe skew also can represent that k the continuous subframe that interior 1/2/3/4/5/... the subframe of time-domain resource assignment period starts is configured to device discovery resource, k is more than or equal to 1 integer, can arrange by signal deployment or in system.For example, for the example of Fig. 5, if agreement or configuration k=2, the device discovery subframe of the first configuration signal configuration is as shown in the blue subframe in Fig. 6 so.

Or time-domain resource can be configured by the mode of instruction cycle, subframe position.The explanation in cycle as hereinbefore, repeats no more.

This time-domain resource configures the subframe position parameter comprising and is used to indicate concrete distributed subframe in time-domain resource assignment period.For example, subframe position can be configured by the mode of bitmap, and whether bitmap is put this corresponding subframe of 1 expression and whether be configured to device discovery subframe.

Or time-domain resource is determined by the mode of instruction subframe combination.For example, can arrange to belong to a uplink hybrid automatic repeat request (Hybrid Autonomous Repeat Request, HARQ) subframe of process (Process) is as a combination, so always have 8 combinations, use the bitmap of 8 bits to represent whether the subframe in corresponding combination is configured to device discovery subframe.Such as, the 1st bit in bitmap represents that the subframe of satisfied (SFN*10+SN) mod8=0 of subframe numbering SN is configured to device discovery subframe (SN span 0-9), the 2nd bit in bitmap represents that the subframe of satisfied (SFN*10+SN) mod8=1 of subframe numbering SN is configured to device discovery subframe, and the rest may be inferred.

Embodiment 2

In the first configuration signal, also may comprise the frequency domain radio resource configuration parameters that is used to indicate device discovery frequency band position, this frequency domain radio resource configuration parameters is found frequency domain resource for distributing equipment.

Frequency domain resource can be distributed by the frequency domain resource piece method of salary distribution in LTE system (the frequency domain radio configuration parameters in the first configuration signal is the resource allocation parameters based on the defined frequency domain resource piece of the LTE system method of salary distribution).For example, can distribute type 0 (Resource Allocation type0 by resource, RA type0), resource distribute Class1 (RA type1) or resource distribute type 2 (RA type2) carry out frequency domain resource distribution, repeat no more.

Or frequency domain resource can be distributed by the mode of bitmap (bitmap) (the frequency domain radio configuration parameters in the first configuration signal is predefined frequency domain resource configuration index).Such as, device discovery signal takies k Resource Block at frequency domain, and the length of bitmap is that (n/k rounds downwards so ) individual bit, the maximum bandwidth of the carrier wave that system bandwidth or the system that n is this frequency domain resource place carrier wave supported, unit is Resource Block.Whether the bit in bitmap puts 1, represents whether the frequency band of this bit representative is configured to device discovery resource.Or the length of bitmap can be n, each bit represents whether the Resource Block that this bit is corresponding is configured to device discovery resource.

Or, frequency domain resource is distributed by frequency offset parameters, the frequency domain radio configuration parameters in the first configuration signal is to represent the initial parameter of frequency domain resource, and now user can be identified for the frequency domain resource of device discovery in conjunction with the frequency domain resource bandwidth of arranging in advance according to the initial parameter of this frequency domain resource.Such as, device discovery signal takies k Resource Block at frequency domain, and the value of this frequency offset parameters is 0 to round downwards to n/k so, and the implication of n is with aforementioned.Get 0 expression Resource Block numbering and be configured to device discovery resource since 0 k Resource Block, getting 1 expression Resource Block numbers k the Resource Block starting from k+1 and is configured to device discovery resource, get 2 expression Resource Block number k the Resource Block starting from 2*k+1 be configured peripheral equipment find resource, by that analogy.Or, the value of this frequency offset parameters is 0 to n-k, get 0 expression Resource Block numbering and be configured to device discovery resource since 0 k Resource Block, get 1 expression Resource Block numbering and be configured to device discovery resource since 1 k Resource Block, get 2 expression Resource Block numberings and be configured peripheral equipment discovery resource since 2 k Resource Block, by that analogy.

Embodiment 3

The network equipment is found public resource according to above-mentioned configuration mode distributing equipment, and generates accordingly the first configuration signal, sends it to subscriber equipment.

The first configuration signal can send by the form of broadcast.For example, the first configuration signal can pass through system information (System Information, SI) and send, and is carried in system information block (SI Block, SIB).This system information block can be the SIB of existing system, and the SIB also newly increasing in system, for example, newly increase the SIB that is exclusively used in D2D communication.

Support D2D device discovery or have the subscriber equipment of D2D device discovery demand to receive the first configuration signal of above-mentioned broadcast transmission.

In the time that subscriber equipment has the demand of transmitting apparatus discovery signals, subscriber equipment is found time-domain resource set according to the above-mentioned broadcast signaling equipment receiving, and in this resource collection, determine the time-domain resource of self transmitting apparatus discovery signals according to default rule, such as being subframe.

Default rule can be the mode of domain discovery resource while selecting at random.For example, UE is in the one-period of device discovery resource, and in time-domain resource set, the random time-domain resource of selecting for example selects a subframe to carry out the transmission of device discovery signal, and UE carries out the transmission of device discovery signal taking cycle as the cycle of device discovery resource.Or, UE determines the transmission cycle of device discovery signal, this cycle is the multiple in device discovery resource cycle, within the device discovery signal transmission cycle, UE random time-domain resource of selecting in time-domain resource set for example selects a subframe to carry out the transmission of device discovery signal, and UE carries out the transmission of device discovery signal taking the specific factor in device discovery resource cycle as the cycle.

Default rule can be, subscriber equipment calculates domain discovery resource when spendable according to device identification (UE_ID).For example, suppose that the cycle of UE transmission discovery signals is identical with the cycle of device discovery time-domain resource, in each time-domain resource cycle, send a discovery signals, subscriber equipment calculates the time-domain resource position that sends discovery signals according to device identification.Suppose to be assigned N time-domain resource in the time-domain resource cycle or subframe is transmitted for discovery signals, can determine so the time domain subframe position of this subscriber equipment transmitting apparatus discovery signals with UE_ID mod N.

Or, the cycle that UE sends discovery signals can be the multiple in device discovery time-domain resource cycle, such as represent this multiple with i, desirable 1 the integer that is more than or equal to of i, can determine with UE_ID mod (i*N) the time domain subframe position of this subscriber equipment transmitting apparatus discovery signals.

Above-mentioned device identification (UE_ID) can be RNTI (the Radio Network Temporary Identification of subscriber equipment, Radio Network Temporary Identifier) or RNTI in partial bit, or partial bit in IMSI (International Mobile Subscriber Identification, IMSI International Mobile Subscriber Identity) or IMSI.Partial bit is such as can be to get a part wherein after above-mentioned mark binary system.Device identification can be also other mark, repeats no more.

Embodiment 4

In the present embodiment, indicate the device discovery resource collection distributing to subscriber equipment by the first configuration signal, carry out the transmission of device discovery signal by the second configuration signal triggering or authorized user device.

Particularly, in the present embodiment, the device discovery procedure of device-to-device communication is as follows:

Subscriber equipment receives by broadcast the first configuration signal that the network equipment sends, and subscriber equipment is determined the set of device discovery time-domain resource accordingly, and wherein the specific descriptions of the first configuration signal and send mode can reference examples 1; In the time that network equipment authorized user device is carried out the transmission of device discovery signal, the network equipment sends the second configuration signal to subscriber equipment, carries out the transmission of device discovery signal by the second configuration signal triggering or authorized user device.

A kind of execution mode is that the first configuration signal can be used for the configuration of device discovery common parameter, for example the set of configuration device discovery time domain public resource, frequency domain resource set; The second configuration signal can be used for the configuration of device discovery special parameters, the device discovery time domain private resource of for example configurable subscriber equipment.When time-domain resource is the subframe in the device discovery time-domain resource set of the first configuration signal configuration as subframe meets, while being again the user equipment specific device discovery subframe of the second configuration signal configuration, subscriber equipment is transmitting apparatus discovery signals in this subframe.

A concrete example as shown in Figure 7.The subframe that in figure, the device discovery time-domain resource set of the first configuration signal configuration is blue representative, the subframe that the user equipment specific device discovery resource of the second configuration signal configuration is red representative, both coincidences, the subframe of red representative is the subframe of subscriber equipment transmitting apparatus discovery signals.

Wherein, the second configuration signal can be found by configuration wireless frame period, radio frames skew the time domain radio frames position of resource with configuration UE special equipment, by bitmap, the device discovery subframe position in described radio frames is set.Example user equipment specific device discovery resource distribution as shown in Figure 7, the wireless frame period of the second configuration signal instruction is 2, and radio frames skew is 1, and bitmap is 0001000000.

Or the second configuration signal can be found subframe with configuration UE special equipment by configuration period of sub-frame, subframe skew.Example user equipment specific device discovery resource distribution as shown in Figure 7, the period of sub-frame of the second configuration signal instruction is 20, subframe skew is 13.

Or the second configuration signal can be found subframe with configuration UE special equipment by the transmission cycle of configuration device discovery signals and subframe skew.For example, the cycle of the device discovery time domain public resource configuring is expressed as Pr with radio frames, desirable 1 the integer that is more than or equal to of transmission cycle Pt configuring by the second configuration signal so, represents that the cycle of subscriber equipment transmitting apparatus discovery signals is expressed as Pt*Pr by radio frames; Subframe skew is found the position of subframe in transmission cycle for the special equipment that is expressed as subscriber equipment and configures.In example example as shown in Figure 7, Pr=1, Pt=2, the device discovery signal transmission cycle that the second configuration signal is user device configuration is 2 radio frames, subframe skew is 1, is illustrated in transmission cycle the 2nd device discovery subframe and is configured to the special subframe of device discovery of this subscriber equipment.

It should be noted that, each parameter that above-mentioned the second configuration signal configures can be used respectively independently parameter to represent in the second configuration signal, also can each parameter carry out combined coding, and the independent parameter obtaining by combined coding represents.

Described the second configuration signal of this example, can be high-level signaling, for example, send to user by RRC signaling.Also can be physical layer signaling, for example, send by the indicated Physical Downlink Shared Channel PDSCH of physical downlink control channel PDCCH; Or send by PDCCH, such as can or for the DCI of D2D communication scheduling, the second configuration signal being set at existing Downlink Control Information DCI, or in reuse system, some DCI form carries out the transmission of the second configuration signal, such as DCI form 0 or form 1A or form 3 or other existing forms are redefined, use described DCI form to carry out the carrying of the second configuration signal.

Subscriber equipment receives after the first configuration signal and the second configuration signal, determines device discovery subframe according to described configuration signal, and sends or checkout equipment discovery signals in described device discovery subframe.

In the time that the second configuration signal sends in the mode of physical layer signaling, the second configuration signal also carries out the transmission of device discovery signal for triggering subscriber equipment.

For example, in the second configuration signal, include triggering indication parameter, whether be triggered by the transmission of this trigger parameter indication equipment discovery signals.Can arrange, subscriber equipment receives after the second configuration signal at subframe m, first meet be more than or equal to the device discovery subframe of k with the interval of the second configuration signal transmission subframe in transmitting apparatus discovery signals, k is the integer of agreement, such as desirable k=4, or k=6, etc.

A concrete example as shown in Figure 8.In the drawings, the device discovery time-domain resource set of the first configuration signal configuration is as shown in the blue subframe in figure, and the second configuration signal sends in the subframe 9 (subframe numbering 0～9) of radio frames 4n+1.Subscriber equipment receives after the second configuration signal in the subframe 9 of radio frames 4n+1, first meet be more than or equal to the device discovery subframe of k with subframe 9 intervals of radio frames 4n+1 in transmitting apparatus discovery signals.Such as k=4, subscriber equipment is at the subframe 3 transmitting apparatus discovery signals of radio frames 4n+2 so; Such as k=6, subscriber equipment is at the subframe 3 transmitting apparatus discovery signals of radio frames 4 (n+1) so.

Subscriber equipment receives after the second configuration signal, and the number of times of transmitting apparatus discovery signals can be only to send out once, or sends repeatedly.Send repeatedly and can determine by the form of agreement, for example, arrange subscriber equipment and receive after the second configuration signal, in the available devices that next meets space requirement is found subframe, continue to send i time, i is more than or equal to 1 integer.The number of times sending also can be configured, for example, in the second configuration signal, comprise the parameter of the lasting transmission times that is used to indicate device discovery signal simultaneously, and subscriber equipment is determined the lasting transmission times of device discovery signal according to the instruction of this parameter.

When device discovery signal is while sending repeatedly, can in the each device discovery subframe that meets time interval requirement, send, also can send with cycle form, the for example cycle of equipment for indicating user transmitting apparatus discovery signals in the second configuration signal, this cycle can represent by the multiple in device discovery time-domain resource cycle, for example can be configured to 1/2/3/4..., the cycle that represents subscriber equipment transmitting apparatus discovery signals is 1/2/3/4... times of time-domain resource cycle.For the example in Fig. 8, the device discovery time-domain resource cycle is 20ms, and while being configured to 1/2/3/4... so, the cycle of transmitting apparatus discovery signals is 20/40/60/80...ms.

The power contorl parameters that also can comprise the device discovery signal transmitting power that is used to indicate user equipment specific in the second configuration signal, subscriber equipment is according to the transmitted power of this parameter setting device discovery signals.

Embodiment 5

The present embodiment provides a kind of method for discovering equipment for device-to-device communication, mainly comprises following operation:

Network equipment is found the first configuration signal to subscriber equipment transmitting apparatus, and this first configuration signal is configured for the device discovery resource of device discovery signal transmission, and subscriber equipment carries out device discovery by device discovery resource;

Wherein, the first configuration signal at least comprises following one or more parameters:

Particularly, in the first configuration signal, the description of included each parameter can, referring to the corresponding contents of above-described embodiment 1 and 2, not repeat them here.

Also have some schemes to propose, based on the above method, network side can also send to subscriber equipment the second configuration signal of the user equipment specific resource for determining the transmission of device discovery signal, and wherein, the second configuration signal at least comprises following one or more parameters:

Separately there are some schemes to propose, based on the above method, network side also can send the second configuration signal for triggering described subscriber equipment transmission or checkout equipment discovery signals to subscriber equipment, and wherein, the second configuration signal at least comprises following one or more parameters:

It should be noted that, the second involved configuration signal of above-mentioned two schemes can be high-level signaling, by special RRC signaling bear.Also can be physical layer signaling, by Downlink Control Information or Physical Downlink Shared Channel carrying.

Particularly, the time domain radio resource configuration parameters in the second configuration signal at least comprises following one or more parameters:

Embodiment 6

The present embodiment provides a kind of subscriber equipment, can realize the method for discovering equipment of above-described embodiment 1 and 2, and its structure as shown in Figure 9, comprises first communication module, resource determination module and second communication module.

First communication module, communicates with the network equipment, receives device discovery the first configuration signal that network equipment sends, and wherein, the first configuration signal at least comprises following one or more parameters:

Resource determination module, is identified for according to the first configuration signal the device discovery resource that device discovery signal transmits;

Particularly, above-mentioned resource determination module is identified for the device discovery resource of device discovery signal transmission according to the first configuration signal, comprising:

Second communication module, by device discovery resource transmitting equipment discovery signals or checkout equipment discovery signals, and the device discovery that carries out device-to-device communication according to device discovery signal.

Particularly, second communication module is checkout equipment discovery signals in device discovery resource, finds target UE by described detection.

Separately have some schemes to propose, the first communication module in subscriber equipment, can also receive device discovery the second configuration signal that network equipment sends, and wherein, the second configuration signal at least comprises following one or more parameters:

Now, resource determination module, is identified for according to the first configuration signal and described the second configuration signal the user equipment specific resource that device discovery signal transmits;

Second communication module, transmitting apparatus discovery signals in determined private resource.

Certainly also have some schemes to propose, first communication module in subscriber equipment, can also receive sending or device discovery second configuration signal of checkout equipment discovery signals for triggering subscriber equipment that network equipment sends, wherein, the second configuration signal at least comprises following one or more parameters:

Now, resource determination module, determines the transmission of device discovery signal or detects time slot according to the first configuration signal and the second configuration signal;

Second communication module sends or detects described device discovery signal in determined time slot.

In above-mentioned subscriber equipment, involved the first configuration signal and the concrete form of the second configuration signal all can, referring to the corresponding contents in above-described embodiment 1,2 and 3, not repeat them here.

Embodiment 7

The present embodiment provides a kind of network equipment, can realize the method for discovering equipment of above-described embodiment 1 to 3, and its structure as shown in figure 10, comprises resource distribution module and communication module.

Wherein, resource distribution module, finds resource and generates configuration signal for configuration device.Configuration signal comprises the first configuration signal, and the concrete form of the first configuration signal can, referring to the corresponding contents of above-described embodiment 1 to 3, repeat no more.

Communication module, for being broadcast to subscriber equipment by the first configuration signal of resource distribution block configuration;

Some schemes also propose, resource distribution module in network equipment, send after the first configuration signal in communication module, also configure the second configuration signal, the second configuration signal sends or checkout equipment discovery signals for the resource distributing user device-specific device discovery resource in the first configuration signal configuration or for triggering subscriber equipment.Now, the first configuration signal of resource distribution block configuration and the second configuration signal are sent to subscriber equipment by communication module.Wherein, the concrete form of the second configuration signal can, referring to the corresponding contents of above-described embodiment 1 to 3, repeat no more.

Embodiment 8

The present embodiment provides a kind of network equipment, and its structure as shown in figure 11, comprises resource distribution module, trigger module and communication module.

Resource distribution module, finds resource and generates the first configuration signal for configuration device.Repeat no more.

Trigger module, for triggering subscriber equipment transmission or checkout equipment discovery signals and generating the second configuration signal.

Communication module, for sending to subscriber equipment by the first configuration signal of resource distribution block configuration; And the second configuration signal that trigger module is generated sends to subscriber equipment.

Wherein, the second configuration signal at least comprises following one or more parameters:

Above-mentioned the second configuration signal can be physical layer signaling, by Downlink Control Information or Physical Downlink Shared Channel carrying.

And the Radio Resource that network side configures can distribute in the upstream band of FDD (Frequency Division Duplexing, Frequency Division Duplexing (FDD)) system; Or,

In the sub-frame of uplink of TDD (Time Division Duplexing, time division duplex) system, distribute; Or,

In dedicated frequency band, configure, this dedicated frequency band refers to be exclusively used in the frequency band of device-to-device communication.

One of ordinary skill in the art will appreciate that all or part of step in said method can carry out instruction related hardware by program and complete, described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits.Correspondingly, the each module/unit in above-described embodiment can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.The application is not restricted to the combination of the hardware and software of any particular form.

The above, be only preferred embodiments of the present invention, is not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims

1. for a method for discovering equipment for device-to-device communication, it is characterized in that, the method comprises:

2. the method for claim 1, is characterized in that, described time domain radio resource configuration parameters comprises:

3. the method for claim 1, is characterized in that, described frequency domain radio resource configuration parameters one in the following manner represents:

Predefined frequency domain resource configuration index; Or,

For representing the parameter that frequency domain resource is initial.

4. the method as described in claims 1 to 3 any one, is characterized in that, described subscriber equipment is identified for the device discovery resource of device discovery signal transmission according to described the first configuration signal, comprising:

5. method as claimed in claim 4, is characterized in that, the frequency domain resource that described subscriber equipment sends described device discovery signal is the indicated frequency band of described the first configuration signal frequency domain radio resource configuration parameters.

6. the method as described in claims 1 to 3 any one, is characterized in that, described subscriber equipment is identified for the device discovery resource of device discovery signal transmission according to described the first configuration signal, comprising:

7. the method as described in claims 1 to 3 any one, is characterized in that, the method also comprises:

8. method as claimed in claim 7, is characterized in that, the time domain radio resource configuration parameters in described the second configuration signal at least comprises following one or more parameters:

9. method as claimed in claim 7, is characterized in that,

10. the method as described in claims 1 to 3 any one, is characterized in that, the method also comprises:

Be used to indicate the parameter that device discovery signal sends the cycle;

11. methods as claimed in claim 10, is characterized in that,

12. methods as described in claim 1-3 any one, is characterized in that,

Described Radio Resource distributes in the upstream band of FDD system; Or,

The method for discovering equipment of 13. 1 kinds of device-to-device communications, is characterized in that, the method comprises:

14. methods as claimed in claim 13, is characterized in that, the method also comprises:

15. methods as claimed in claim 13, is characterized in that, the method also comprises:

Be used to indicate the parameter that device discovery signal sends the cycle;

16. 1 kinds of subscriber equipmenies, is characterized in that, this equipment comprises:

17. subscriber equipmenies as claimed in claim 16, is characterized in that, described resource determination module is identified for the device discovery resource of device discovery signal transmission according to described the first configuration signal, comprising:

18. subscriber equipmenies as claimed in claim 17, is characterized in that, the frequency domain resource that sends described device discovery signal is the indicated frequency band of described the first configuration signal frequency domain radio resource configuration parameters.

19. subscriber equipmenies as claimed in claim 16, is characterized in that,

Described second communication module is checkout equipment discovery signals in described device discovery resource, finds target UE by described detection.

20. subscriber equipmenies as described in claim 16 to 19 any one, is characterized in that,

Described first communication module, device discovery the second configuration signal also sending for receiving described network equipment, wherein, described the second configuration signal at least comprises following one or more parameters:

21. subscriber equipmenies as described in claim 16 to 19 any one, is characterized in that,

Be used to indicate the parameter that device discovery signal sends the cycle;

22. 1 kinds of network equipments, is characterized in that, this equipment comprises:

23. equipment as claimed in claim 22, is characterized in that, described time domain radio resource configuration parameters comprises:

24. equipment as claimed in claim 22, is characterized in that, described frequency domain radio resource configuration parameters one in the following manner represents:

Predefined frequency domain resource configuration index; Or,

Frequency domain resource initial parameters.

25. equipment as described in claim 22 to 24 any one, is characterized in that,

26. equipment as claimed in claim 25, is characterized in that, the time domain radio resource configuration parameters in described the second configuration signal at least comprises following one or more parameters:

27. equipment as claimed in claim 25, is characterized in that,

28. equipment as described in claim 22 to 24 any one, is characterized in that,

Described resource distribution module, send after described the first configuration signal in described communication module, also generate the second configuration signal that triggers described subscriber equipment transmission or checkout equipment discovery signals, wherein, described the second configuration signal at least comprises following one or more parameters:

Be used to indicate the parameter that device discovery signal sends the cycle;

29. equipment as claimed in claim 28, is characterized in that,

30. equipment as described in claim 22 to 24 any one, is characterized in that,

Described Radio Resource distributes in the upstream band of FDD system; Or,