CN106793154B

CN106793154B - D2D directly has found the selection method and system of resource

Info

Publication number: CN106793154B
Application number: CN201610618107.1A
Authority: CN
Inventors: 高兴航; 徐伟杰; 潘振岗
Original assignee: Beijing Spreadtrum Hi Tech Communications Technology Co Ltd
Current assignee: Beijing Ziguang Zhanrui Communication Technology Co Ltd
Priority date: 2016-07-29
Filing date: 2016-07-29
Publication date: 2018-10-16
Anticipated expiration: 2036-07-29
Also published as: CN106793154A

Abstract

A kind of D2D directly has found that the selection method and system of resource, the selection method include：Distance terminal and link terminal receive the direct discovery resource pool set of base station configuration respectively；Distance terminal, which determines, finds transfer resource, and on identified discovery transfer resource, is sent to link terminal and directly find request message；Link terminal, which receives, directly finds request message, obtains the terminal type of distance terminal；When distance terminal is narrowband terminal, link terminal selection from directly discovery resource pool set finds transfer resource pond, and is sent to distance terminal on the corresponding discovery transfer resource in selected discovery transfer resource pond and directly find response message；Distance terminal selection in directly finding resource pool set finds to receive resource pool, and receives to receive in resource in the corresponding discovery of selected discovery reception resource pool and directly find response message.Said program can ensure that narrowband terminal can carry out the direct discovery procedures of normal D2D.

Description

D2D directly has found the selection method and system of resource

Technical field

The present invention relates to selection methods and system that wireless communication field more particularly to a kind of D2D directly have found resource.

Background technology

In recent years, third generation cooperative partner program (The 3^rdGeneration Partnership Project, 3GPP) Long term evolution (Long Term Evolution, LTE) technology develops rapidly, and has been widely applied to each technical field.Terminal Straight-through (Device to Device, D2D) technology refers to allowing user equipment (User under a kind of control of communication system Equipment, UE) between the technology that is directly communicated by reuse pattern resource.D2D technologies can increase cellular communication system System spectrum efficiency, reduces UE transmission powers, solves the problems, such as that wireless communication system frequency spectrum resource is deficient to a certain extent.

With the development of technology of Internet of things, intelligent terminal is more universal.To accelerate the development of technology of Internet of things, 3GPP In R13 versions, be proposed enhanced machine type communication (enhanced Machine Type Communications, EMTC)/narrowband Internet of Things (Narrow Band Internet of Things, NB-IoT) technology.

In the R12 versions and R13 versions of 3GPP, D2D technologies only support broadband data transmission.Draw in R13 versions The eMTC/NB-IoT technologies entered only support narrow band data to transmit, and therefore, eMTC UE and NB-IoT UE can be described as narrowband end again End.The corresponding bandwidth of eMTC UE is 1.4MHz, at most in 6 Physical Resource Block (Physical in same subframe Resource Block, PRB) resource in transceiving data；The corresponding bandwidth of NB-IoT UE is 180KHz, in same subframe It is limited in transceiving data in the resource of most PRB.

In the prior art, in the direct discovery procedure of the terminal of D2D, used discovery transfer resource pond is provided with reception is found Source pond is all based on what broadband transmission was configured, and narrowband terminal uses the direct discovery procedures of existing D2D, possibly can not receive Required data.

Invention content

Present invention solves the technical problem that being that narrowband terminal how to be enable to carry out the direct discovery procedures of normal D2D.

In order to solve the above technical problems, the embodiment of the present invention provides a kind of D2D selection method for directly finding resource, packet It includes：Distance terminal and link terminal receive the direct discovery resource pool set of base station configuration respectively；The distance terminal determines It was found that resource, and in identified discovery resource, sent to the link terminal and directly find request message；The relaying is eventually End receives the direct discovery request message, obtains the terminal type of the distance terminal；When the distance terminal is that narrowband is whole When end, the link terminal directly finds that selection finds resource pool in resource pool set from described, and is provided in selected discovery It is sent to the distance terminal on the corresponding discovery transfer resource in source pond and directly finds response message；The distance terminal is described It directly finds that selection finds to receive resource pool in resource pool set, and receives the corresponding discovery of resource pool in selected discovery and connect It receives and receives the direct discovery response message in resource；Wherein, the selected discovery transfer resource pond of the link terminal and institute It is identical to state the selected discovery reception resource pool of distance terminal.

Optionally, the distance terminal, which determines, finds transfer resource, including：The distance terminal receives the base station configuration RRC signaling, the RRC signaling includes the special discovery transfer resource of the distance terminal of base station configuration；It is described Distance terminal reads the RRC signaling, therefrom obtains the special discovery transfer resource, transmits and provides as identified discovery Source.

Optionally, the distance terminal, which determines, finds transfer resource, including：The distance terminal directly finds money from described Any one resource pool is selected in the set of source pond, part resource is randomly choosed from the resource pool selected as identified discovery Transfer resource.

Optionally, find that transfer resource includes frequency domain position and time-domain position determined by the distance terminal.

Optionally, the narrowband terminal includes following any：EMTC terminals, NB-IoT terminals；When the distance terminal For eMTC terminals when, the frequency domain position of the discovery transfer resource of the distance terminal is that the Physical Resource Block call number of setting corresponds to Frequency domain position, the distance terminal finds Physical Resource Block call number corresponding physics money that transfer resource is the setting Source block and adjacent Physical Resource Block；When the distance terminal is NB-IoT terminals, the discovery of the distance terminal The frequency domain position of transfer resource is the corresponding frequency domain position of sub-carrier indices number of setting, the discovery transmission money of the distance terminal Sub-carrier indices number corresponding subcarrier and adjacent n subcarrier of the source for the setting, n and the discovery request message Data volume it is related.

Optionally, the link terminal receives the direct discovery request message, obtains the terminal class of the distance terminal Type, including：The link terminal receives the secondary link that the distance terminal is sent and directly finds that request message, the pair link are straight It includes the terminal type cell of the distance terminal and the identification information of the distance terminal that sending and receiving, which show request message, described remote The terminal type cell of end terminal is suitable to indicate that the terminal type of the distance terminal；The link terminal is straight from the secondary link Sending and receiving show the identification information of terminal type cell and the distance terminal that the distance terminal is read in request message, therefrom Obtain the terminal type of the distance terminal and the identification information of the distance terminal.Optionally, the link terminal is from institute It states and directly finds that selection finds transfer resource pond in resource pool set, and in the corresponding discovery in selected discovery transfer resource pond It is sent to the distance terminal on transfer resource and directly finds response message, including：The link terminal monitors the direct hair All resource pools in existing resource pool set；When the link terminal receives the direct discovery request message, from described Directly find to select the discoverys transfer resource pond in resource pool set, selected the discoverys transfer resource pond and it is described far That holds terminal determination finds that the resource pool residing for transfer resource is identical；The link terminal is in the selected discovery resource pool In, select frequency domain resource identical with the frequency domain resource position of discovery resource that the distance terminal determines；The link terminal The direct discovery response message is sent in the identical frequency domain resource, or in the identical frequency domain resource offset one The direct discovery response message is sent in the frequency domain resource of a offset parameter.

Optionally, the distance terminal directly finds to select to find to receive resource pool in resource pool set described, including： The distance terminal is directly found in resource pool set from described, is selected and the selected discovery transfer resource of the link terminal The identical resource pool in pond receives resource pool as the discovery.

Optionally, the link terminal directly finds to select discovery transfer resource pond in resource pool set from described, and Directly discovery response message is sent to the distance terminal on the corresponding discovery transfer resource in selected discovery transfer resource pond, Including：The link terminal selects institute according to the identification information of the distance terminal from the direct discovery resource pool set State selected discovery transfer resource pond；The link terminal is in the selected discovery transfer resource pond, selection and institute State the identical frequency domain resource in frequency domain resource position of the discovery transfer resource of distance terminal determination；The link terminal is in the phase The direct discovery response message is sent in same frequency domain resource, or deviates a biasing ginseng in the identical frequency domain resource The direct discovery response message is sent in several frequency domain resources.

Optionally, the link terminal directly finds resource pool collection according to the identification information of the distance terminal from described The discovery transfer resource pond is selected in conjunction, including：The link terminal is according to formula M₁=ID₁Mod N, from the direct hair The discovery transfer resource pond is selected in existing resource pool set, wherein：M₁For the call number in selected discovery transfer resource pond, ID₁For the identification information of the distance terminal, N is the resource pool sum directly found in resource pool set.

Optionally, the distance terminal directly finds to select to find to receive resource pool in resource pool set described, including： The distance terminal selects the discovery to receive resource according to the identification information of itself from the direct discovery resource pool set Pond.

Optionally, the distance terminal is selected according to the identification information of itself from the direct discovery resource pool set The discovery receives resource pool, including：The distance terminal is according to formula M₂=ID₁Mod N, from the direct discovery resource pool The discovery is selected to receive resource pool in set, wherein：M₂For the selected rope for finding transfer resource pond of the distance terminal Quotation marks, ID₁For the identification information of the distance terminal, N is the resource pool sum directly found in resource pool set.

Optionally, the identification information of the distance terminal is that the layer two that core net is the distance terminal configuration identifies.

Optionally, what the link terminal was sent directly finds in response message, includes the terminal class of the link terminal The identification information of type cell and the link terminal；Wherein, the terminal type cell of the link terminal is suitable to indicate that described The terminal type of link terminal.

Optionally, the identification information of the link terminal is that the layer two that core net is the link terminal configuration identifies.

Optionally, described directly to find request message and the direct hair when the distance terminal is NB-IoT terminals The occupied bandwidth of existing response message is less than or equal to the bandwidth that 1 PRB pair is answered.

Optionally, the direct discovery resource pool set of the base station configuration is transmitted by following any mode：By setting Surely the system information block transmission extended；Or, being transmitted with the relevant system information block of narrowband terminal by preset.

Optionally, the direct discovery resource pool set includes：EMTC terminals directly find resource pool set, the eMTC Terminal directly finds that any eMTC terminals in resource pool set directly find that resource pool includes：Subframe, starting subframe can be transmitted Position, frequency domain resource sum and starting frequency domain resource position.

Optionally, the eMTC terminals directly find that the bandwidth of resource pool is less than or equal to the bandwidth of 6 Physical Resource Block.

Optionally, the direct discovery resource pool set includes：NB-IoT terminals directly find resource pool set, described NB-IoT terminals directly find that any NB-IoT terminals in resource pool set directly find that resource pool includes：Can transmit subframe, Originate subframe position, frequency domain resource sum and starting frequency domain resource position.

Optionally, the NB-IoT terminals directly find that the bandwidth of resource pool is less than or equal to the band of 1 Physical Resource Block It is wide.

The embodiment of the present invention additionally provides the selection system that a kind of D2D directly has found resource, including：Base station, distance terminal And link terminal, wherein：The base station is suitable for preconfigured straight to the distance terminal and link terminal broadcast Sending and receiving show resource pool set；The distance terminal is adapted to determine that discovery transfer resource, and in identified discovery transfer resource On, it is sent to the link terminal and directly finds request message；And it directly finds to select to find in resource pool set described Resource pool is received, and is received in selected discovery and receives the direct discovery response in the corresponding discovery reception resource of resource pool Message；The link terminal is suitable for receiving the direct discovery request message, obtains the terminal type of the distance terminal；When When the distance terminal is narrowband terminal, the link terminal directly finds that selection finds transmission money in resource pool set from described Source pond, and send to the distance terminal on the corresponding discovery transfer resource in selected discovery transfer resource pond and directly find Response message；Wherein, the selected discovery transfer resource pond of the link terminal connects with the selected discovery of the distance terminal It is identical to receive resource pool.

Optionally, the distance terminal, suitable for receiving and reading the RRC signaling of the base station configuration, therefrom described in acquisition The special discovery transfer resource of the distance terminal of base station configuration is as identified discovery transfer resource.

Optionally, the distance terminal, suitable for selecting any one resource pool from the direct discovery resource pool set, Part resource is randomly choosed from the resource pool selected as identified discovery transfer resource.

Optionally, the link terminal directly finds request message suitable for receiving the secondary link that the distance terminal is sent, The pair link directly finds that request message includes the terminal type cell of the distance terminal and the mark of the distance terminal Know information, the terminal type cell of the distance terminal is suitable to indicate that the terminal type of the distance terminal；From the secondary link It directly finds to read the terminal type cell of the distance terminal and the identification information of the distance terminal in request message, from The identification information of the middle terminal type and the distance terminal for obtaining the distance terminal.

Optionally, the link terminal is suitable for when the distance terminal is narrowband terminal, monitors the directly discovery money All resource pools in the set of source pond；When receiving the direct discovery request message, resource pool collection is directly found from described The discovery transfer resource pond, the selected discovery for finding transfer resource pond and being determined with the distance terminal are selected in conjunction Resource pool residing for transfer resource is identical；In the selected discovery transfer resource pond, select true with the distance terminal The identical frequency domain resource in frequency domain resource position of fixed discovery transfer resource；It is sent in the identical frequency domain resource described straight Sending and receiving show response message, or send in the frequency domain resource that the identical frequency domain resource deviates an offset parameter described straight Sending and receiving show response message.

Optionally, the distance terminal is suitable for directly finding in resource pool set from described, selection and the link terminal The identical resource pool in selected discovery transfer resource pond receives resource pool as the discovery.

Optionally, the link terminal is suitable for the identification information according to the distance terminal, from the direct discovery resource The discovery transfer resource pond is selected in the set of pond；In the discovery transfer resource pond, selection is determined with the distance terminal Discovery transfer resource the identical frequency domain resource in frequency domain resource position；It is sent in the identical frequency domain resource described direct It was found that response message, or send in the frequency domain resource that the identical frequency domain resource deviates an offset parameter it is described directly It was found that response message.

Optionally, the link terminal is suitable for according to formula M₁=ID₁Mod N directly have found resource pool set from described The middle selection discovery transfer resource pond, wherein：M₁For the selected call number for finding transfer resource pond, ID₁It is described The identification information of distance terminal, N are the resource pool sum directly found in resource pool set.

Optionally, the distance terminal is suitable for, according to the identification information of itself, directly finding in resource pool set from described The discovery is selected to receive resource pool.

Optionally, the distance terminal is suitable for according to formula M₂=ID₁Mod N directly have found resource pool set from described The middle selection discovery receives resource pool, wherein：M₂For the selected call number for finding transfer resource pond of the distance terminal, ID₁For the identification information of the distance terminal, N is the resource pool sum directly found in resource pool set.

Compared with prior art, the technical solution of the embodiment of the present invention has the advantages that：

When distance terminal is narrowband terminal, the hair for being adapted for directly finding response message transmission of link terminal selection Resource pool is now received, the discovery reception resource pool phase for being adapted for directly finding response message and receiving with distance terminal selection Together.That is, when distance terminal is narrowband terminal, link terminal is chosen identical resource pool with distance terminal and is carried out directly It was found that the transmission and reception of response message, therefore distance terminal can know that link terminal transmission directly finds the position of response message It sets, response message is directly found so as to receive, therefore can ensure that narrowband terminal carries out normal D2D discovery procedures.

When distance terminal is narrowband terminal, link terminal carries out directly finding to send out on the same resource with distance terminal The transmission and reception of cloth message, thus distance terminal can be informed in which resource carry out directly give out information connect It receives, therefore can ensure that narrowband terminal carries out normal D2D discovery procedures.

Description of the drawings

Fig. 1 is the flow chart for the selection method that a kind of D2D in the embodiment of the present invention directly has found resource；

Fig. 2 is a kind of selected schematic diagram for finding transfer resource of link terminal in the embodiment of the present invention；

Fig. 3 is the flow chart for the selection method that another D2D in the embodiment of the present invention directly has found resource；

Fig. 4 is the structural schematic diagram for the selection system that a kind of D2D in the embodiment of the present invention directly has found resource.

Specific implementation mode

ProSe short distance business includes ProSe directly discovery and direct communication.In the prior art, D2D is directly had found There are two spike-type cultivars distribution types：Type1 is broadcast-type, directly finds that the distribution of resource occupied by signal is based on the special sides of non-UE Formula is independently selected by terminal, suitable for the UE in the covering and UE outside covering；Type2 is tailored version, directly finds signal institute The distribution for occupying resource is based on UE dedicated modes, is distributed by base station, suitable for the UE in covering.

In existing direct discovery, there are two kinds of discovery transmission modes：ModeA uses independent one discovery protocol message For directly finding publication (Announcement), belong to broadcast-type；ModeB has found protocol message for direct using two It was found that request and directly discovery response (Solicitation and Response).

In the existing direct discovery procedures of D2D, the transmitting-receiving resource of the UE of base station configuration does not carry out stringent limitation.It is in Find that receive resource is obtained by the system information of base station broadcast, covers in base station used in UE in base station range It is preconfigured that the discovery of UE outside range, which receives resource,.Needed for UE is received by monitoring all discovery reception resource pools Data.

However, since the transmitting-receiving ability of the narrowband terminals such as eMTC UE or NB-IoT UE is limited in bandwidth, if base station Configuration is found the total bandwidth for receiving resource pool more than narrow-band devices reception ability, then narrowband terminal is possibly to receive Required data cause narrowband terminal that can not be normally carried out the direct discovery procedures of D2D.

In embodiments of the present invention, when distance terminal is narrowband terminal, link terminal selection is adapted for directly sending out The discovery of now response message transmission receives resource pool, is adapted for what directly discovery response message received with what distance terminal selected It was found that it is identical to receive resource pool.That is, when distance terminal is narrowband terminal, link terminal is identical as distance terminal selection Resource pool carry out directly find response message transmission and reception, therefore distance terminal can know link terminal transmission directly It was found that the position of response message, response message is directly found so as to receive, therefore it is normal to ensure that narrowband terminal carries out D2D discovery procedures.

It is understandable to enable above-mentioned purpose, feature and the advantageous effect of the present invention to become apparent, below in conjunction with the accompanying drawings to this The specific embodiment of invention is described in detail.

Before the D2D provided in the embodiment of the present invention directly has found that the selection method of resource is described in detail, first Two kinds specified in existing 3GPP agreements direct discovery modes are briefly described respectively.

In the direct discovery modes of ModeA, link terminal transmission directly gives out information.Distance terminal can receive more Direct the giving out information of a link terminal transmission, according to multiple direct signal qualities to give out information, from multiple After the link terminal for selecting a signal quality best in terminal.Later, distance terminal can with selected link terminal into Row D2D direct communications.

In the direct discovery modes of ModeB, distance terminal sends to multiple relayings and directly finds request message.Multiple relayings Terminal sends to distance terminal after receiving directly discovery request message and directly finds response message.Distance terminal is receiving Response message is directly found to what multiple link terminals were sent, according to the signal qualities of multiple directly discovery response messages, from more The link terminal for selecting a signal quality best in a link terminal.Later, distance terminal can be with selected relaying eventually End carries out D2D direct communications.

An embodiment of the present invention provides the selection methods that a kind of D2D directly has found resource, referring to Fig.1, below by way of specific Step is described in detail.

Step S101, distance terminal and link terminal receive the direct discovery resource pool set of base station configuration respectively.

In specific implementation, base station configured it is direct find resource pool set can with the terminal type of distance terminal with And the terminal type of link terminal is related.When cell residing for the distance terminal supports narrowband terminal communication or link terminal institute When the cell at place supports narrowband terminal communication, base station can be in different system information block (System Information Block, SIB) in the corresponding direct discovery money of the corresponding direct discovery resource pool set of wide-band terminal, eMTC terminals is respectively configured Source pond, which is gathered, and NB-IoT terminals are corresponding directly finds resource pool set.

That is, base station can believe on the existing SIB for set by narrowband terminal, namely in same system On the different SIB of breath, the corresponding direct discovery resource pool set of different terminals type is respectively configured, and broadcasted.

In embodiments of the present invention, base station can also redefine the SIB of an extension, and the SIB of the extension is current The system information block not yet made in 3GPP agreements.For example, the SIB of extension is SIB21.It base station can be in the SIB21 newly defined Upper broadcast eMTC terminals directly find that resource pool set, or broadcast NB-IoT terminals directly find resource pool set.

In directly finding resource pool set, directly find that resource pool includes that can be used for transmitting or receive directly to find to disappear The resource of breath directly finds that resource pool can be referred to as to find when directly finding that resource pool is used for transmission directly discovery message Transfer resource pond；When directly finding that resource pool directly finds message for receiving, directly find that resource pool can be referred to as to send out Now receive resource pool.

Base station can be broadcast to all terminals after completing directly to find the configuration of resource pool by system information.In The direct discovery resource pool set of base station broadcast is received respectively after terminal and distance terminal, directly finds the money in resource pool set Source pond is used to carry link terminal and carries out the data that sidelink links are directly found with distance terminal.What it is due to base station broadcast is In message of uniting, it is understood that there may be following three kinds：That is the directly discovery money of the directly discovery resource pool set, eMTC terminals of wide-band terminal Source pond is gathered and the directly discovery resource pool set of NB-IoT terminals.Therefore, link terminal is receiving base with distance terminal When the system message broadcasted of standing, it can be obtained and the terminal class of itself from system message respectively according to the terminal type of itself Type is corresponding directly to find resource pool set.

For example, distance terminal is eMTC terminals, link terminal is wide-band terminal, then distance terminal is obtained from system message EMTC terminals directly find that resource pool set, link terminal obtain wide-band terminal from system message and directly find resource pool collection It closes.

In embodiments of the present invention, when distance terminal is eMTC terminals, base station configuration directly finds resource pool set Resource pool set is directly found for eMTC terminals.

In practical applications, eMTC terminals directly find in resource pool set to may include that one or more eMTC terminals are straight Sending and receiving show resource pool, each eMTC terminal directly finds that resource pool includes：subframeBitmap、offsetIndicator、 NumPRB, start PRB or end PRB, wherein：SubframeBitmap is used for the subframe that determination can be transmitted, OffsetIndicator is for determining starting subframe position, and numPRB is for determining frequency domain resource sum, start PRB or end Frequency domain resource positions of the PRB for determining starting.

That is, eMTC terminals, which directly find to be configured in resource pool, can transmit subframe, starting subframe position, frequency domain money Source sum and starting frequency domain resource position.

In embodiments of the present invention, since the bandwidth of eMTC terminals corresponds to 6 PRB, the eMTC terminals of base station configuration Directly find that the bandwidth of resource pool is less than or equal to the bandwidth of 6 PRB.

When distance terminal is NB-IoT terminals, to be combined into NB-IoT terminals direct for the direct discovery resource pool collection of base station configuration It was found that resource pool set.

In practical applications, NB-IoT terminals directly find in resource pool set to may include that multiple NB-IoT terminals are direct It was found that resource pool, each NB-IoT terminal directly finds that resource pool includes：subframeBitmap、offsetIndicator、 NumSubcarrier and start Subcarrier or end Subcarrier, wherein：SubframeBitmap is for determining The subframe that can be transmitted, offsetIndicator is for determining starting subframe position, and numSubcarrier is for determining that frequency domain provides Source sum, frequency domain resource positions of start Subcarrier or the end Subcarrier for determining starting.

That is, NB-IoT terminals, which directly find to be configured in resource pool, can transmit subframe, starting subframe position, frequency domain Total number resource and starting frequency domain resource position.

In embodiments of the present invention, since the bandwidth of NB-IoT terminals corresponds to 1 PRB, the NB-IoT of base station configuration Terminal directly finds that the bandwidth of resource pool is less than or equal to the bandwidth of 1 PRB.

Step S102, the distance terminal, which determines, finds transfer resource, and on identified discovery transfer resource, to institute It states link terminal and sends directly discovery request message.

For the direct discovery modes of ModeB, in the direct discovery procedures of D2D, what link terminal was sent directly finds message Type be directly find request message, distance terminal send directly find message type be directly discovery response message. For the direct discovery modes of ModeA, in the direct discovery procedures of D2D, the type for the direct discovery message that link terminal is sent is It directly gives out information, the direct type for finding message that distance terminal receives is directly to give out information.

In practical applications, message indication information element is carried in directly finding message, is used to indicate the direct discovery and disappears The type of breath is direct discovery request message, directly finds response message, or is directly given out information.

In specific implementation, in the direct discovery procedure of the direct discovery modes of ModeB, distance terminal is first to link terminal It sends and directly finds request message.In embodiments of the present invention, distance terminal, which can be determined first, finds transfer resource.It is determining It was found that after resource, distance terminal sends to link terminal in identified discovery resource and directly finds request message.

In specific implementation, what the distance terminal was sent directly finds that request message is that secondary link (sidelink) is direct It was found that request message.In sidelink directly has found request message, the terminal type letter of distance terminal can be previously provided with The identification information of member and distance terminal, wherein：The terminal type cell of distance terminal can serve to indicate that the end of distance terminal Hold type；The identification information of distance terminal can be the mark of layer two namely layer- that core-network side is distance terminal configuration 2ID。

In practical applications, the terminal type of distance terminal can be eMTC terminals, or NB-IoT terminals may be used also Think common wide-band terminal.Common wide-band terminal refers to the terminal removed except narrowband terminal, for example, intelligence on the market Mobile phone.

In the embodiment of the present invention, distance terminal is identified to find that transfer resource can be that distance terminal is independently chosen , can also be that base station is pre-configured, and is sent to distance terminal by base station.

In an embodiment of the present invention, base station configures the dedicated discovery transfer resource of distance terminal in RRC signaling, and will RRC signaling is sent to distance terminal.Distance terminal therefrom obtains special discovery and passes after the RRC signaling for receiving base station configuration Defeated resource, using the special discovery transfer resource got as identified discovery transfer resource.

In an alternative embodiment of the invention, distance terminal is arbitrary to select in the directly discovery resource pool set that base station configures A resource pool is selected, and in selected resource pool, the resource for selecting to be used for transmission directly discovery request message is true as institute Fixed discovery transfer resource.

When the discovery transfer resource of distance terminal is configured by base station, base station side can be that different distance terminals is distinguished Different discovery transfer resources is configured, can be sent out the case where the discovery transfer resource same to avoid multiple distance terminal simultaneous selections It is raw.

In specific implementation, find that transfer resource includes frequency domain position and time-domain position determined by distance terminal.

When distance terminal is eMTC terminals, find that the frequency domain position of transfer resource is setting determined by distance terminal The corresponding frequency domain position of PRB call numbers (index).At this point, finding that transfer resource is the PRB ropes of setting determined by distance terminal The corresponding Physical Resource Block of quotation marks and adjacent Physical Resource Block.That is, finding to pass determined by distance terminal Defeated resource includes two Physical Resource Block, and the call number of adjacent Physical Resource Block can add for the PRB call numbers of the setting 1, or the PRB call numbers of the setting subtract 1.

For example, finding that the corresponding PRB call numbers of frequency domain position of transfer resource are 2 determined by distance terminal, then distally Find that transfer resource is that call number is 2 corresponding Physical Resource Block and call number is 3 corresponding physics moneys determined by terminal Source block.For another example, find that the corresponding PRB call numbers of frequency domain position of transfer resource are 2 determined by distance terminal, then distance terminal Identified discovery transfer resource is that call number is 2 corresponding Physical Resource Block and call number is 1 corresponding Physical Resource Block.

When distance terminal is NB-IoT terminals, find that the frequency domain position of transfer resource is setting determined by distance terminal The corresponding frequency domain position of sub-carrier indices number (Subcarrier index).At this point, finding transmission determined by distance terminal Resource is the corresponding subcarrier of sub-carrier indices number of setting and adjacent n subcarrier, n and directly discovery request message Data volume is related, directly finds that the data volume of request message is bigger, n is bigger；Conversely, directly finding that the data volume of request message is got over Small, n is smaller.

For example, n=5, the sub-carrier indices number of setting are 4, then find that transfer resource is index determined by distance terminal Number to find that transfer resource be call number is 2~7 corresponding sub- loads determined by 4~9 corresponding subcarriers or distance terminal Wave.

Step S103, the link terminal receive the direct discovery request message, obtain the terminal of the distance terminal Type.

In specific implementation, link terminal directly finds request message in the sidelink for receiving distance terminal transmission Afterwards, the terminal type cell that reading distance terminal in request message is directly found from sidelink, so as to know distal end eventually End is what kind of terminal, is eMTC terminals or NB-IoT terminals or common wide-band terminal.

Step S104, when the distance terminal is narrowband terminal, the link terminal is from the direct discovery resource pool Selection finds transfer resource pond in set, and to described on the corresponding discovery transfer resource in selected discovery transfer resource pond Distance terminal, which is sent, directly finds response message.

In specific implementation, link terminal is directly found in request message from the sidelink received, reads distal end eventually The terminal type cell at end.When distance terminal is narrowband terminal, direct discovery of the link terminal from the base station configuration received Selection finds transfer resource pond in resource pool set.After selected discovery transfer resource pond, transmits and provide in selected discovery In the resource in source pond, is sent to distance terminal and directly find response message.

Link terminal can be taken when sending directly discovery response message to distance terminal in directly finding response message The identification information of terminal type cell and link terminal with link terminal.The terminal type cell of link terminal can be used In the terminal type of instruction link terminal, the identification information of link terminal can be the layer two that core-network side is link terminal configuration Mark namely layer-2ID.

Link terminal is selected below to find that the flow in transfer resource pond illustrates.

In specific implementation, link terminal can be wide-band terminal, that is to say, that link terminal can monitor direct discovery All resource pools in resource pool set, to receive the required data received.When link terminal is receiving distance terminal hair When the direct discovery request message sent, from directly discovery resource pool set, selection and discovery transmission determined by distance terminal The identical resource pool of the corresponding resource pool of resource, as discovery transfer resource pond.

After selected discovery transfer resource pond, link terminal is in the discovery transfer resource pond of selection, when that can transmit Machine, selection frequency domain resource identical with the frequency domain resource position of transfer resource is found determined by distance terminal, and in the phase It is sent in same frequency domain resource and directly finds response message.Link terminal can also in the discovery transfer resource pond of selection, Can transmission opportunity, with determined by distance terminal find transfer resource frequency domain position on deviate an offset parameter (offset) it is sent in frequency domain resource and directly finds response message.

For example, finding that the call number of the corresponding resource pool of transfer resource is 1 determined by distance terminal.Link terminal is connecing Receive distance terminal transmission direct discovery request message after, from directly discovery resource pool set in, select call number for 1 money Source pond is as discovery transfer resource pond.Later, link terminal is in the discovery transfer resource pond that call number is 1, when that can transmit On machine, sends in frequency domain resource identical with the frequency domain resource position of transfer resource is found determined by distance terminal and directly send out Existing response message.

With reference to Fig. 2, the selected signal for finding transfer resource of a kind of link terminal in the embodiment of the present invention is given Figure.With time division multiplexing (Time Division Duplexing, TDD) for uplink/downlink (uplink/ Downlink, UL/DL) configuration mode 0 for.

In Fig. 2, abscissa is time-domain position, as unit of subframe；Ordinate is frequency domain position, as unit of PRB.TDD 0 corresponding time-domain position of UL/DL configuration modes be embodied in the part subframe in subframeBitmap be 2,3,4,7,8, 9, frequency domain position is embodied in the resource that 6 PRB pairs of numPRB, start PRB or end PRB between PRB3~PRB9 are answered, Above-mentioned time-domain position and the corresponding resource of frequency domain position, which can be used for transmitting, directly finds message.In embodiments of the present invention, directly It is directly to give out information that sending and receiving, which show message,.

Base station is that the discovery transfer resource of distance terminal configuration is：Time-domain position is subframe 2, and frequency domain position is index Number be 5 and 6 PRB.Base station is that the corresponding discovery transfer resource pond P1 of discovery transfer resource of distance terminal configuration should be：Time domain Position is subframe 2,3,4,7,8,9, and frequency domain position is the PRB of call number 3~9.

Link terminal 1 and link terminal 2 receive the direct discovery request message of distance terminal transmission.Link terminal 1 It selects to find transfer resource pond P1 as discovery transfer resource in directly finding resource pool set respectively with link terminal 2 Pond.In finding transfer resource pond P1, transmission transfer resource that link terminal 1 selects for：Time-domain position is subframe 3, frequency Domain position is the PRB that call number is 5 and 6.Link terminal 2 select send transfer resource for：Time-domain position is subframe 4, frequency Domain position is the PRB that call number is 6 and 7.

It is understood that in specific implementation, link terminal 1 and 2 selected time-domain position of link terminal can also It is identical.For example, link terminal 1 and 2 selected time-domain position of link terminal are subframe 4.

When link terminal 1 is identical as 2 selected time-domain position of link terminal, the selected frequency domain position of the two can be with It, can also there is only empty sets there are intersection.

For example, 1 selected frequency domain position of link terminal is the PRB that call number is 6 and 7,2 selected frequency of link terminal Domain position is the PRB that call number is 4 and 5.For another example, 1 selected frequency domain position of link terminal is the PRB that call number is 6 and 7, 2 selected frequency domain position of link terminal is the PRB that call number is 5 and 6.

In specific implementation, link terminal can also be according to the identification information of distance terminal, from directly discovery resource pool collection Selection finds transfer resource pond in conjunction.After selecting to find transfer resource pond according to the identification information of distance terminal, selected In the discovery transfer resource pond selected, selection frequency identical with the frequency domain resource position of transfer resource is found determined by distance terminal Domain resource.

Link terminal can in selected discovery transfer resource pond, can transmission opportunity, selection with distance terminal institute It is sent in the identical frequency domain resource in frequency domain resource position of determining discovery transfer resource and directly finds response message.Link terminal Can also in selected discovery transfer resource pond, can transmission opportunity, selection with distance terminal determined by find transmit In the frequency domain resource of frequency domain resource position one offset parameter (offset) of identical frequency domain resource position offset of resource, send Directly find response message.

In an embodiment of the present invention, link terminal uses formula M₁=ID₁Mod N, from directly discovery resource pool set Selection finds resource pool, wherein M₁For the call number in selected discovery transfer resource pond, ID₁Believe for the mark of distance terminal Breath, N are the resource pool sum directly found in resource pool set.

In embodiments of the present invention, the identification information of distance terminal can be the mark of layer two of distance terminal, namely layer-2ID。

For example, ID₁It is 26 to be converted into decimal number, directly finds the resource pool sum N=6 in resource pool set, then M₁= 26 mod 6=2.That is, the resource pool that the discovery transfer resource pond that link terminal selects is 2 for call number.In call number In 2 resource pool, to select frequency domain resource position frequency domain resource identical with transfer resource is found determined by distance terminal. In selected frequency domain resource, link terminal sends to distance terminal and directly finds response message.

Step S105, the distance terminal directly find to select to find to receive resource pool in resource pool set described, and It is received in selected discovery and receives the direct discovery response message in the corresponding discovery reception resource of resource pool.

In specific implementation, distance terminal receives resource pool in from the discovery directly found selected in resource pool set It is identical after the selected discovery transfer resource pond of terminal.That is, distance terminal can know which link terminal selects in advance The resource of a resource pool directly finds response message to send, and without monitoring entire directly discovery resource pool set, only needs Selection discovery identical with the discovery transfer resource pond that link terminal selects resource is received from directly discovery resource pool set Pond, and monitor selected discovery and receive resource pool, you can it receives and directly finds response message.

In specific implementation, when link terminal is using the identification information choosing of the terminal type and distance terminal of distance terminal When selecting discovery transfer resource pond, distance terminal can be found to select in resource pool set according to the identification information of itself from direct It was found that receiving resource pool.

In an embodiment of the present invention, distance terminal uses formula M₂=ID₁Mod N, from directly discovery resource pool set Selection finds reception resource pool, wherein：M₂For the selected call number for finding transfer resource pond of distance terminal.As it can be seen that relaying The selected call number M for finding transfer resource pond of terminal₁, with the selected call number for finding to receive resource pool of distance terminal M₂It is identical.

For example, ID₁It is 26 to be converted into decimal number, directly finds the resource pool sum N=6 in resource pool set, then M₁= 26 mod 6=2, therefore, M₂=2 namely distance terminal it is selected find receive resource pool call number be 2.Distance terminal It only needs to monitor directly to find in resource pool set, the resource pool that call number is 2 directly finds resource pool without monitoring 6 all resource pools in set.

It can be seen that when distance terminal is narrowband terminal, the directly discovery response that is adapted for of link terminal selection disappears The discovery of breath transmission receives resource pool, is adapted for directly finding that the discovery that response message receives receives with what distance terminal selected Resource pool is identical.That is, when distance terminal is narrowband terminal, link terminal chooses identical resource pool with distance terminal Directly find the transmission and reception of response message, therefore distance terminal can know that link terminal transmission directly finds response The position of message directly finds response message so as to receive, therefore can ensure that narrowband terminal carries out normal D2D discoveries Process.

Directly find that the signaling process of the selection method of resource is carried out to the D2D provided in the above embodiment of the present invention below Explanation.With reference to Fig. 3, the selection methods for directly finding resource of another D2D in the embodiment of the present invention are given.

Step S31, base station broadcast directly find resource pool set.

When narrowband terminal communication is supported in the corresponding base station of cell residing for the distance terminal, the system message of base station broadcast In, may include wide-band terminal direct communication resource pool set, eMTC terminal direct communication resource pool set and NB-IoT whole Hold direct communication resource pool set.

Step S32, link terminal receive the directly discovery resource pool set of base station configuration.

Step S33, distance terminal receive the directly discovery resource pool set of base station configuration.

Step S34, distance terminal, which determines, finds transfer resource.

Step S35, distance terminal send to link terminal on determining discovery transfer resource and directly find that request disappears Breath.

Step S36, link terminal, which receives, directly finds request message.

Step S37, link terminal selection from directly discovery resource pool set find transfer resource pond.

Step S38, link terminal is on the corresponding discovery transfer resource in discovery transfer resource pond of selection to distance terminal It sends and directly finds response message.

Step S39, distance terminal selection in directly finding resource pool set find to receive resource pool.

Step S310, distance terminal are finding that receiving the corresponding discovery of resource pool receives reception directly discovery response in resource Message.

In the prior art, in the R12 versions of 3GPP agreements and R13 versions, directly find that message occupies two companies Continuous PRB is transmitted.For eMTC terminals, since the maximum transmission bandwidth that eMTC terminals are supported is 6 PRB, EMTC terminals being capable of the existing direct discovery message of normal use.

However, for NB-IoT terminals, since the maximum transmission bandwidth that NB-IoT terminals are supported is 1 PRB, because This, the existing direct demand for finding message and cannot be satisfied NB-IoT terminals.To solve the above problems, being carried in the embodiment of the present invention A kind of direct discovery message for NB-IoT terminals of new definition, the direct discovery for NB-IoT terminals newly defined are supplied The occupied bandwidth of message is less than or equal to the bandwidth that 1 PRB pair is answered.That is, the direct discovery modes of ModeB are directed to, What link terminal was sent directly finds that the occupied bandwidth of response message is less than or equal to the bandwidth of 1 PRB.

In the direct discovery message for NB-IoT terminals newly defined, including the terminal type of distance terminal and remote Hold the identification information of terminal.It can also include other information in the direct discovery message newly defined, be not repeated herein.

With reference to Fig. 4, an embodiment of the present invention provides the selection system that a kind of D2D directly has found resource, including base station 401, Distance terminal 402 and link terminal 403, wherein：

The base station 401, it is preconfigured straight suitable for being broadcasted to the distance terminal 402 and the link terminal 403 Sending and receiving show resource pool set；

The distance terminal 402 is adapted to determine that discovery transfer resource, and on identified discovery transfer resource, to institute It states link terminal 403 and sends directly discovery request message；And in the selection discovery reception in directly finding resource pool set Resource pool, and receive the corresponding discovery of resource pool in selected discovery and receive to receive the direct discovery in resource and respond and disappear Breath；

The link terminal 403 is suitable for receiving the direct discovery request message, obtains the end of the distance terminal 402 Hold type；When the distance terminal 402 is narrowband terminal, the link terminal 403 directly finds resource pool set from described Middle selection finds transfer resource pond, and to the distal end on the corresponding discovery transfer resource in selected discovery transfer resource pond Terminal 402, which is sent, directly finds response message；

Wherein, 403 selected discovery transfer resource pond of the link terminal and 402 selected hair of the distance terminal It is identical now to receive resource pool.

In specific implementation, the distance terminal 402 may be adapted to the RRC letters for receiving and reading the configuration of the base station 401 It enables, the special discovery transfer resource for therefrom obtaining the distance terminal of the configuration of the base station 401 is passed as identified discovery Defeated resource.

In specific implementation, the distance terminal 402 may be adapted to the selection from the direct discovery resource pool set and appoint One resource pool of meaning randomly chooses part resource as identified discovery transfer resource from the resource pool selected.

In specific implementation, find determined by the distance terminal 402 transfer resource may include frequency domain position and Time-domain position.

In specific implementation, the narrowband terminal may include following any：EMTC terminals, NB-IoT terminals；Work as institute When to state distance terminal 402 be eMTC terminals, the frequency domain position of the discoverys transfer resource of the distance terminal 402 is the physics set The corresponding frequency domain position of resource block call number, the distance terminal 402 find that transfer resource is the physical resource of the setting The corresponding Physical Resource Block of block call number and adjacent Physical Resource Block；When the distance terminal 402 is NB-IoT whole When end, the frequency domain position of the discovery transfer resource of the distance terminal 402 is the corresponding frequency domain position of sub-carrier indices number of setting It sets, the transfer resource that finds of the distance terminal 402 is the corresponding subcarrier of sub-carrier indices number of the setting and adjacent N subcarrier, n is related to the discovery data volume of request message.

In specific implementation, the link terminal 403 is suitable for receiving the secondary link that the distance terminal 402 is sent direct It was found that request message, the pair link directly find request message include the distance terminal 402 terminal type cell and The terminal type cell of the identification information of the distance terminal 402, the distance terminal 402 is suitable to indicate that the distance terminal 402 terminal type；Directly find to read the terminal type cell of the distance terminal 402 from the secondary link in request message And the identification information of the distance terminal 402, terminal type and the distal end for therefrom obtaining the distance terminal 402 are whole The identification information at end 402.

In specific implementation, the link terminal 403 may be adapted to, when the distance terminal is narrowband terminal, monitor All resource pools directly found in resource pool set；When receiving the direct discovery request message, from described straight Sending and receiving, which show, selects the discovery transfer resource pond in resource pool set, the selected discovery transfer resource pond and the distal end What terminal 402 determined finds that the resource pool residing for transfer resource is identical；In the selected discovery transfer resource pond, selection Frequency domain resource identical with the discovery frequency domain resource position of transfer resource that the distance terminal 402 determines；Described identical The direct discovery response message is sent in frequency domain resource, or in one offset parameter of the identical frequency domain resource offset The direct discovery response message is sent in frequency domain resource.

In specific implementation, the distance terminal 402 may be adapted to from the direct discovery resource pool set, selection Resource pool identical with the selected discovery transfer resource pond of the link terminal receives resource pool as the discovery.

In specific implementation, the link terminal 403 may be adapted to the identification information according to the distance terminal 402, from The discovery transfer resource pond is selected in the direct discovery resource pool set；In the discovery transfer resource pond, selection with The identical frequency domain resource in frequency domain resource position for the discovery transfer resource that the distance terminal 402 determines；In the identical frequency The direct discovery response message is sent in the resource of domain, or deviates the frequency of an offset parameter in the identical frequency domain resource The direct discovery response message is sent in the resource of domain.

In specific implementation, the link terminal 403 may be adapted to according to formula M₁=ID₁Mod N, from the direct hair The discovery transfer resource pond is selected in existing resource pool set, wherein：M₁For the selected rope for finding transfer resource pond Quotation marks, ID₁For the identification information of the distance terminal 402, N is the resource pool sum directly found in resource pool set.

In specific implementation, the distance terminal 402 may be adapted to the identification information according to itself, from the direct hair The discovery is selected to receive resource pool in existing resource pool set.

In specific implementation, the distance terminal 402 may be adapted to according to formula M₂=ID₁Mod N, from the direct hair The discovery is selected to receive resource pool in existing resource pool set, wherein：M₂For the selected discovery transmission money of the distance terminal The call number in source pond, ID₁For the identification information of the distance terminal, N is the resource pool directly found in resource pool set Sum.

In specific implementation, the identification information of the distance terminal 402 can be that the layer two of the distance terminal 402 is marked Know.

In specific implementation, described directly to find request message and institute when the distance terminal 402 is NB-IoT terminals It states and directly finds that the occupied bandwidth of response message is less than or equal to the bandwidth that 1 PRB pair is answered.

In specific implementation, the base station 401, being suitable for can be by the direct discovery of following any mode transmission configuration Resource pool set：By the system information block transmission for setting extension；Or, passing through the preset and relevant system information of narrowband terminal Block transmits.

In specific implementation, the direct discovery resource pool set may include following any：EMTC terminals are directly sent out Existing resource pool set, NB-IoT terminals directly find resource pool set, wherein：The eMTC terminals directly find resource pool set In any eMTC terminals directly find that resource pool includes：Subframe, starting subframe position, frequency domain resource sum can be transmitted and risen Beginning frequency domain resource position；The NB-IoT terminals directly find that any NB-IoT terminals in resource pool set directly find resource Pond includes：Subframe, starting subframe position, frequency domain resource sum and starting frequency domain resource position can be transmitted.

In specific implementation, the eMTC terminals directly find that the bandwidth of resource pool is less than or equal to 6 Physical Resource Block Bandwidth, the NB-IoT terminals directly find resource pool bandwidth be less than or equal to 1 Physical Resource Block bandwidth.

One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is can It is completed with instructing relevant hardware by program, which can be stored in a computer readable storage medium, storage Medium may include：ROM, RAM, disk or CD etc..

Although present disclosure is as above, present invention is not limited to this.Any those skilled in the art are not departing from this It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute Subject to the range of restriction.

Claims

1. a kind of D2D directly has found the selection method of resource, which is characterized in that including：

Distance terminal and link terminal receive the direct discovery resource pool set of base station configuration respectively；

The distance terminal, which determines, finds transfer resource, and on identified discovery transfer resource, is sent out to the link terminal It send and directly finds request message；

The link terminal receives the direct discovery request message, obtains the terminal type of the distance terminal；

When the distance terminal is narrowband terminal, the link terminal is according to the identification information of the distance terminal from described straight Sending and receiving show selection in resource pool set and find transfer resource pond, and in the corresponding discovery transmission in selected discovery transfer resource pond It is sent to the distance terminal in resource and directly finds response message；

The distance terminal is according to the identification information of itself in the selection discovery reception resource in directly finding resource pool set Pond, and received in selected discovery and receive the direct discovery response message in the corresponding discovery reception resource of resource pool；

Wherein, the selected discovery transfer resource pond of the link terminal receives resource with the selected discovery of the distance terminal Pond is identical.

2. D2D as described in claim 1 directly has found the selection method of resource, which is characterized in that the distance terminal determines It was found that transfer resource, including：

The distance terminal receives the RRC signaling of the base station configuration, and the RRC signaling includes the described of the base station configuration The special discovery transfer resource of distance terminal；

The distance terminal reads the RRC signaling, the special discovery transfer resource is therefrom obtained, as identified discovery Transfer resource.

3. D2D as described in claim 1 directly has found the selection method of resource, which is characterized in that the distance terminal determines It was found that transfer resource, including：

The distance terminal selects any one resource pool from the direct discovery resource pool set, from the resource pool of selection Part resource is randomly choosed as identified discovery transfer resource.

4. D2D as described in claim 1 directly has found the selection method of resource, which is characterized in that the distance terminal institute is really Fixed discovery transfer resource includes frequency domain position and time-domain position.

5. D2D as claimed in claim 4 directly has found the selection method of resource, which is characterized in that the narrowband terminal includes It is following any：EMTC terminals, NB-IoT terminals；

When the distance terminal is eMTC terminals, the frequency domain position of the discovery transfer resource of the distance terminal is the object of setting The corresponding frequency domain position of resource block call number is managed, the distance terminal finds that transfer resource is the Physical Resource Block of the setting The corresponding Physical Resource Block of call number and adjacent Physical Resource Block；

When the distance terminal is NB-IoT terminals, the frequency domain position of the discovery transfer resource of the distance terminal is setting The corresponding frequency domain position of sub-carrier indices number, the distance terminal find that transfer resource is the sub-carrier indices number of the setting Corresponding subcarrier and n adjacent subcarrier, n are related to the discovery data volume of request message.

6. D2D as described in claim 1 directly has found the selection method of resource, which is characterized in that the link terminal receives The direct discovery request message, obtains the terminal type of the distance terminal, including：

The link terminal receives the secondary link that the distance terminal is sent and directly finds that request message, the pair link are directly sent out Existing request message includes the terminal type cell of the distance terminal and the identification information of the distance terminal, and the distal end is whole The terminal type cell at end is suitable to indicate that the terminal type of the distance terminal；

The link terminal directly finds to read the terminal type cell of the distance terminal in request message from the secondary link And the identification information of the distance terminal, therefrom obtain the terminal type of the distance terminal and the mark of the distance terminal Know information.

7. D2D as claimed in claim 6 directly has found the selection method of resource, which is characterized in that the link terminal is from institute It states and directly finds that selection finds transfer resource pond in resource pool set, and in the corresponding discovery in selected discovery transfer resource pond It is sent to the distance terminal on transfer resource and directly finds response message, including：

The link terminal monitors the direct all resource pools found in resource pool set；

When the link terminal receives the direct discovery request message, selected from the direct discovery resource pool set The discovery transfer resource pond, the selected discovery transfer resource for finding transfer resource pond and being determined with the distance terminal Residing resource pool is identical；

In the selected discovery transfer resource pond, selection passes the link terminal with the discovery that the distance terminal determines The identical frequency domain resource in frequency domain resource position of defeated resource；

The link terminal sends the direct discovery response message in the identical frequency domain resource, or described identical Frequency domain resource deviate an offset parameter frequency domain resource on send the direct discovery response message.

8. D2D as claimed in claim 7 directly has found the selection method of resource, which is characterized in that the distance terminal is in institute It states and directly finds that selection finds to receive resource pool in resource pool set, including：

The distance terminal directly finds in resource pool set that selection is transmitted with the selected discovery of the link terminal from described The identical resource pool of resource pool receives resource pool as the discovery.

9. D2D as claimed in claim 6 directly has found the selection method of resource, which is characterized in that the link terminal is in institute It is sent to the distance terminal on the corresponding discovery transfer resource in discovery transfer resource pond of selection and directly finds response message, packet It includes：

10. D2D as claimed in claim 9 directly has found the selection method of resource, which is characterized in that the link terminal according to The identification information of the distance terminal selects the discovery transfer resource pond from the direct discovery resource pool set, including：

The link terminal is according to formula M₁=ID₁Mod N select the discovery to pass from the direct discovery resource pool set Defeated resource pool, wherein：M₁For the call number in selected discovery transfer resource pond, ID₁For the identification information of the distance terminal, N For the resource pool sum directly found in resource pool set.

11. D2D as claimed in claim 10 directly has found the selection method of resource, which is characterized in that the distance terminal root According to the identification information of itself, the discovery is selected to receive resource pool from the direct discovery resource pool set, including：

The distance terminal is according to formula M₂=ID₁Mod N select the discovery to connect from the direct discovery resource pool set Resource pool is received, wherein：M₂For the selected call number for finding transfer resource pond of the distance terminal, ID₁For the distance terminal Identification information, N be it is described directly find resource pool set in resource pool sum.

12. D2D as claimed in claim 9 directly has found the selection method of resource, which is characterized in that the mark of the distance terminal It is that the layer two that core net is the distance terminal configuration identifies to know information.

13. D2D as described in claim 1 directly has found the selection method of resource, which is characterized in that the link terminal is sent Directly find response message in, including the mark of the terminal type cell of the link terminal and the link terminal letter Breath；Wherein, the terminal type cell of the link terminal is suitable to indicate that the terminal type of the link terminal.

14. D2D as claimed in claim 13 directly has found the selection method of resource, which is characterized in that the link terminal Identification information is that the layer two that core net is the link terminal configuration identifies.

15. D2D as described in claim 1 directly has found the selection method of resource, which is characterized in that when the distance terminal is When NB-IoT terminals, the direct discovery request message and the occupied bandwidth of the direct discovery response message are less than or equal to The bandwidth that 1 PRB pair is answered.

16. D2D as described in claim 1 directly has found the selection method of resource, which is characterized in that the base station configures straight Sending and receiving show resource pool set and are transmitted by following any mode：

By the system information block transmission for setting extension；

Or, being transmitted with the relevant system information block of narrowband terminal by preset.

17. D2D as described in claim 1 directly has found the selection method of resource, which is characterized in that the direct discovery resource Gather in pond：

EMTC terminals directly find that resource pool set, the eMTC terminals directly find any eMTC terminals in resource pool set Directly find that resource pool includes：Subframe, starting subframe position, frequency domain resource sum and starting frequency domain resource position can be transmitted.

18. D2D as claimed in claim 17 directly has found the selection method of resource, which is characterized in that the eMTC terminals are straight Sending and receiving show bandwidth of the bandwidth less than or equal to 6 Physical Resource Block of resource pool.

19. D2D as described in claim 1 directly has found the selection method of resource, which is characterized in that the direct discovery resource Gather in pond：

NB-IoT terminals directly find resource pool set, wherein：The NB-IoT terminals directly find appointing in resource pool set One NB-IoT terminals directly find that resource pool includes：Subframe, starting subframe position, frequency domain resource sum and starting frequency can be transmitted Domain resource location.

20. D2D as claimed in claim 19 directly has found the selection method of resource, which is characterized in that the NB-IoT terminals Directly find that the bandwidth of resource pool is less than or equal to the bandwidth of 1 Physical Resource Block.

21. a kind of D2D directly has found the selection system of resource, which is characterized in that including：Base station, distance terminal and relaying are eventually End, wherein：

The base station is suitable for directly finding resource pool collection to the distance terminal and link terminal broadcast are preconfigured It closes；

The distance terminal is adapted to determine that discovery transfer resource, and on identified discovery transfer resource, eventually to the relaying End, which is sent, directly finds request message；And it directly finds to select to send out in resource pool set described according to the identification information of itself Resource pool is now received, and is received in selected discovery and receives the direct discovery sound in the corresponding discovery reception resource of resource pool Answer message；

The link terminal is suitable for receiving the direct discovery request message, obtains the terminal type of the distance terminal；Work as institute When to state distance terminal be narrowband terminal, the link terminal directly finds to provide according to the identification information of the distance terminal from described Selection finds transfer resource pond in the set of source pond, and on the corresponding discovery transfer resource in selected discovery transfer resource pond to The distance terminal, which is sent, directly finds response message；

22. D2D as claimed in claim 21 directly has found the selection system of resource, which is characterized in that the distance terminal is fitted In the RRC signaling for receiving and reading the base station configuration, the special hair of the distance terminal of the base station configuration is therefrom obtained Existing transfer resource is as identified discovery transfer resource.

23. D2D as claimed in claim 21 directly has found the selection system of resource, which is characterized in that the distance terminal is fitted In selecting any one resource pool from the direct discovery resource pool set, random selection part provides from the resource pool of selection Source is as identified discovery transfer resource.

24. D2D as claimed in claim 21 directly has found the selection system of resource, which is characterized in that the distance terminal institute Determining discovery transfer resource includes frequency domain position and time-domain position.

25. D2D as claimed in claim 24 directly has found the selection system of resource, which is characterized in that the narrowband terminal packet It includes following any：EMTC terminals, NB-IoT terminals；

26. D2D as claimed in claim 21 directly has found the selection system of resource, which is characterized in that the link terminal is fitted Directly find that request message, the pair link directly find that request message includes in receiving the secondary link that the distance terminal is sent The terminal type cell of the distance terminal and the identification information of the distance terminal, the terminal type letter of the distance terminal Member is suitable to indicate that the terminal type of the distance terminal；It directly finds to read the distal end end in request message from the secondary link The terminal type cell at end and the identification information of the distance terminal, therefrom obtain the distance terminal terminal type and The identification information of the distance terminal.

27. D2D as claimed in claim 26 directly has found the selection system of resource, which is characterized in that the link terminal is fitted In when the distance terminal be narrowband terminal when, monitor it is described directly find resource pool set in all resource pools；Work as reception When to the directly discovery request message, the discovery transfer resource pond, institute are selected from the direct discovery resource pool set It states selected discovery transfer resource pond and finds that the resource pool residing for transfer resource is identical with what the distance terminal determined；Institute It states in selected discovery transfer resource pond, the frequency domain resource position for the discovery transfer resource that selection is determined with the distance terminal Identical frequency domain resource；The direct discovery response message is sent in the identical frequency domain resource, or described identical Frequency domain resource deviate an offset parameter frequency domain resource on send the direct discovery response message.

28. D2D as claimed in claim 27 directly has found the selection system of resource, which is characterized in that the distance terminal is fitted It is directly found in resource pool set in from described, selects money identical with the selected discovery transfer resource pond of the link terminal Source pond receives resource pool as the discovery.

29. D2D as claimed in claim 26 directly has found the selection system of resource, which is characterized in that the link terminal is fitted In the frequency domain resource position phase for the discovery transfer resource in the discovery transfer resource pond, selecting to determine with the distance terminal Same frequency domain resource；The direct discovery response message is sent in the identical frequency domain resource, or described identical The direct discovery response message is sent in the frequency domain resource of frequency domain resource one offset parameter of offset.

30. D2D as claimed in claim 29 directly has found the selection system of resource, which is characterized in that the link terminal is fitted According to formula M₁=ID₁Mod N select the discovery transfer resource pond from the direct discovery resource pool set, wherein： M₁For the selected call number for finding transfer resource pond, ID₁For the identification information of the distance terminal, N is described direct It was found that the resource pool sum in resource pool set.

31. D2D as claimed in claim 30 directly has found the selection system of resource, which is characterized in that the distance terminal is fitted According to formula M₂=ID₁Mod N select the discovery to receive resource pool from the direct discovery resource pool set, wherein： M₂For the selected call number for finding transfer resource pond of the distance terminal, ID₁For the identification information of the distance terminal, N is The resource pool sum directly found in resource pool set.

32. D2D as claimed in claim 21 directly has found the selection system of resource, which is characterized in that when the distance terminal For NB-IoT terminals when, the direct discovery request message and the occupied bandwidth of the direct discovery response message are less than or wait In the bandwidth that 1 PRB pair is answered.