WO2016161981A1 - 设备到设备d2d传输方法及装置 - Google Patents

设备到设备d2d传输方法及装置 Download PDF

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Publication number
WO2016161981A1
WO2016161981A1 PCT/CN2016/078904 CN2016078904W WO2016161981A1 WO 2016161981 A1 WO2016161981 A1 WO 2016161981A1 CN 2016078904 W CN2016078904 W CN 2016078904W WO 2016161981 A1 WO2016161981 A1 WO 2016161981A1
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synchronization signal
resource
synchronization
period
searched
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PCT/CN2016/078904
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English (en)
French (fr)
Inventor
黄双红
吴栓栓
卢有雄
袁弋非
杨瑾
王文焕
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中兴通讯股份有限公司
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Publication of WO2016161981A1 publication Critical patent/WO2016161981A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the present invention relates to the field of communications, and in particular to a device to device D2D transmission method and apparatus.
  • the service data of the user equipment 1 (UE1) to the user equipment 2 (UE2) is first transmitted to the air interface through the air interface.
  • a base station also referred to as a BS, or a Node B, or an evolved Node B
  • the base station transmits the user data to the base station of the cell where the UE2 is located through the core network, and the base station
  • the foregoing service data is transmitted to the UE2 through the air interface.
  • the service data transmission from UE2 to UE1 adopts a similar processing flow. As shown in FIG. 1, FIG.
  • FIG. 1 is a schematic diagram of cellular communication of a UE located in the same base station cell in the related art.
  • UE1 and UE2 are located in the same cell, although two UEs are covered by a cell of the same base station, data transmission remains. Need to transit through the core network, and one data transmission still consumes two wireless spectrum resources.
  • FIG. 2 is a schematic diagram of D2D communication of a UE in the same base station cell in the related art.
  • the D2D refers to that the service data is not forwarded by the base station and the core network, and is directly transmitted by the source user equipment to the target user equipment through the air interface. It can also be called Proximity Service (ProSe).
  • ProSe Proximity Service
  • D2D includes discovery and communication, where discovery includes Type 1 and type 2, and communication includes mode 1 and mode 2.
  • LTE Long Term Evolution
  • R12 Long Term Evolution, LTE for short
  • 3GPP 3rd Generation Partnership Project
  • RAN1 Radio Access Network Work Group 1
  • the applicable scenarios of communication include network coverage, network coverage, and network half coverage scenarios. For discovery, it only works for coverage scenarios.
  • D2D discovery is only applicable to in-coverage scenarios.
  • the base station configures the resource parameters for the UE to be discovered by using the RRC parameter, so that the resource configuration parameters of the UE at the receiving end and the UE at the transmitting end are the same. If the D2D discovery of the half-coverage scenario and the out-of-coverage scenario is to be implemented, the timing synchronization between the discovery UEs of the half-coverage scenario and the out-of-coverage scenario is first solved, and the problem of finding the resource pool alignment between the transmitting UE and the receiving UE is solved.
  • the 3GPP Technical Standards Group proposes the need to apply Type 1 discovery in semi-coverage scenarios and out-of-coverage scenarios.
  • TSG Technical Standards Group
  • the half-coverage scenario and the out-of-coverage scenario are supported at present.
  • the standard conference does not propose an explicit solution to solve the problem.
  • the out-of-band UE obtain the resource pool information of the UE in the coverage to implement the resource pool with the UE in the coverage? Alignment issues. If the above problem is not solved, the out-of-coverage UE and the in-cover discovery UE cannot achieve mutual discovery, and the D2D discovery signal transmitted by the outer UE may also interfere with the cellular communication service. There is currently no definitive solution on this issue.
  • the present invention provides a device-to-device D2D transmission method and apparatus, so as to at least solve the problem of D2D discovery between devices in the related art that cannot implement half coverage and coverage scenarios.
  • a device-to-device D2D transmission method including: a device searching for a first synchronization signal, determining whether to transmit a second synchronization signal according to a search result; and searching for the first synchronization signal by the device
  • the resources for D2D transmission are determined on the basis; D2D signals and/or D2D data are transmitted on the resources.
  • the device searches for the first synchronization signal, and determining, according to the search result, whether to send the second synchronization signal comprises at least one of: if the first synchronization signal is not searched after searching a scanning window, The device searches for the first synchronization signal in a next scan window; if the first synchronization signal is not searched after searching a scan window, the device transmits the second synchronization signal as an independent synchronization source; The first synchronization signal is not searched after a traversal search of the scan window within one cycle, and the device transmits the second synchronization signal as an independent synchronization source.
  • the period length of the one period is a period length of the D2D discovery resource pool period and/or a period length of the D2D communication resource pool period; and the traversing search includes completing the one period in a time unit by using a scan window. Search for all time periods within the length of the cycle.
  • the device searching for the first synchronization signal, determining whether to send the second synchronization signal according to the search result includes: the device selecting a synchronization source after searching the first synchronization signal, and Searching for a new synchronization signal in the scan window; if a new synchronization signal is searched, the device selects a device with a higher priority from the selected synchronization source and the device that sends the new synchronization signal as a new synchronization source; The device transmits the second synchronization signal, wherein a timing at which the second synchronization signal is transmitted is a timing of the new synchronization source.
  • the length of the scan window is a fixed value or a pre-configured value
  • the distribution period of the scan window is a fixed value or a pre-configured value
  • the search range of the device is the length of one scan window.
  • determining, by the device, whether to send the second synchronization signal according to the search result includes: determining, by the device, whether a transmission condition for sending the second synchronization signal is met, where the sending condition includes: The device needs to transmit the D2D signal and/or the D2D data, and the power of the first synchronization signal that is pre-searched by the device is lower than a preset threshold.
  • the sending, by the device, the second synchronization signal according to the first synchronization signal that is previously searched by the device includes: synchronizing the device with a synchronization resource different from a pre-searched first synchronization signal. Send the number on the resource Two sync signals.
  • the second synchronization signal sent by the device is the same as the sequence of the first synchronization signal that is pre-searched by the device.
  • the device further includes at least one of the following: The device terminates transmitting the synchronization signal in a D2D resource pool period in which no D2D signal and/or D2D data is to be transmitted; the device terminates transmitting the synchronization signal after transmitting the synchronization signal; the device terminates transmission after re-searching for the synchronization signal a synchronization signal; the device terminates transmitting the synchronization signal after the timing of the pre-searched synchronization signal expires.
  • the device sends the second synchronization signal in each D2D synchronization signal resource period or D2D synchronization signal resource in a D2D resource pool period, where the D2D resource pool is used to send D2D signals and/or D2D data,
  • the D2D synchronization signal resource is used to send a D2D synchronization signal, and the D2D synchronization signal includes: a second synchronization signal; or
  • the device sends the second synchronization signal in a resource or period of at least one of: a synchronization signal resource period in a D2D resource pool period, a D2D synchronization signal resource, and a latest one before a D2D resource pool period start position a synchronization signal resource period, a synchronization signal resource, the D2D resource pool is used to transmit a D2D signal and/or D2D data, the D2D synchronization signal resource is used to transmit a D2D synchronization signal, and the D2D synchronization signal includes a second synchronization signal.
  • the method further includes: sending the D2D broadcast channel PSBCH.
  • the determining, by the device, the resource for the D2D transmission includes at least one of: the device determining the resource according to the indication message, where the indication message is carried in a physical channel used for resource information indication, or And the indication message is carried in the D2D broadcast channel, where the physical channel includes a newly defined physical channel; the device determines the resource according to the first synchronization signal that is searched; Determining, by the synchronization signal and the indication message, the resource, where the indication message is carried in a physical channel for resource information indication, or the indication message is carried in the D2D broadcast channel, where the physical channel includes a new Defining a physical channel; the device determining the resource based on pre-configured resource parameters.
  • the sending of the physical channel indicated by the resource information includes at least one of: a resource occupied by the sending of the physical channel is a first D2D subframe after the first synchronization signal, The period of the physical channel is greater than or equal to the period of the transmission of the synchronization signal; the resource occupied by the transmission of the physical channel is a pre-configured resource, wherein the pre-configured resource has a predetermined period and a predetermined offset.
  • the transmission priority of the physical channel is lower than the transmission priority of the cellular signal and/or the channel and higher than the transmission priority of the D2D signal and/or the D2D data; the time domain resource occupied by the transmission of the physical channel is used for the transmission a predetermined subframe of the synchronization resource of the first synchronization signal, where the frequency domain resource is a PRB other than a predetermined number of physical resource blocks PRB; and the time domain resource occupied by the transmission of the physical channel is not sent in the synchronization resource A subframe of a synchronization signal, the frequency domain resource is a PRB other than a predetermined number of physical resource pools PRB.
  • determining, by the device, the resource according to the first synchronization signal that is searched includes: determining, by the device, the resource according to a location of a subframe of the first synchronization signal that is searched.
  • the starting position of the resource is within a predetermined offset range after the searched subframe in which the first synchronization signal is located.
  • the determining, by the device, the resource according to the first synchronization signal and the indication message that is searched includes: after searching, by the device, the first synchronization signal, where the first synchronization signal is found
  • the subframe is a reference, and the resource is determined in conjunction with the content of the indication message.
  • a device-to-device D2D transmission device comprising: a search module configured to search for a first synchronization signal, and determining whether to transmit a second synchronization signal according to a search result And a determining module configured to determine a resource for D2D transmission on the basis of searching for the first synchronization signal; and a transmission module configured to transmit the D2D signal and/or D2D data on the resource.
  • the search module includes at least one of: if the first synchronization signal is not searched after searching a scan window, the device searches for the first synchronization signal in a next scan window; The first synchronization signal is not searched after a scan window, and the device transmits the second synchronization signal as an independent synchronization source; if the first synchronization is not found after completing the traversal search for the scan window in one cycle Signal, the device transmitting the second synchronization signal as an independent synchronization source.
  • the period length of the one period is a period length of the D2D discovery resource pool period and/or a period length of the D2D communication resource pool period; and the traversing search includes completing the one period in a time unit by using a scan window. Search for all time periods within the length of the cycle.
  • the search module includes: a search unit configured to select a synchronization source after searching the first synchronization signal, and search for a new synchronization signal in the scan window; and select a unit to set to search for a new one a synchronization signal, selecting, from the selected synchronization source and the device transmitting the new synchronization signal, a device with a higher priority as a new synchronization source; and a transmitting unit configured to transmit the second synchronization signal, where The timing of the second synchronization signal is the timing of the new synchronization source.
  • the length of the scan window is a fixed value or a pre-configured value
  • the distribution period of the scan window is a fixed value or a pre-configured value
  • the search range of the device is the length of one scan window.
  • determining, by the device, whether to send the second synchronization signal according to the search result includes: determining, by the device, whether a transmission condition for sending the second synchronization signal is met, where the sending condition includes: The device needs to transmit the D2D signal and/or the D2D data, and the power of the first synchronization signal that is pre-searched by the device is lower than a preset threshold.
  • the sending, by the device, the second synchronization signal according to the first synchronization signal that is previously searched by the device includes: synchronizing the device with a synchronization resource different from a pre-searched first synchronization signal.
  • the second synchronization signal is transmitted on a resource.
  • the second synchronization signal sent by the device is the same as the sequence of the first synchronization signal that is pre-searched by the device.
  • the device is previously sent by the device according to the first synchronization signal or the device has been sent After transmitting the second synchronization signal, the apparatus further includes at least one of: the device terminating transmitting the synchronization signal in a D2D resource pool period in which no D2D signal and/or D2D data is to be transmitted; the device The transmission of the synchronization signal is terminated after the transmission of the synchronization signal; the device terminates the transmission of the synchronization signal after re-searching for the synchronization signal; the device terminates the transmission of the synchronization signal after the timing of the previously searched synchronization signal expires.
  • the device sends the second synchronization signal in each D2D synchronization signal resource period or D2D synchronization signal resource in a D2D resource pool period, where the D2D resource pool is used to send D2D signals and/or D2D data,
  • the D2D synchronization signal resource is used to send a D2D synchronization signal, and the D2D synchronization signal includes: a second synchronization signal; or
  • the device sends the second synchronization signal in a resource or period of at least one of: a synchronization signal resource period in a D2D resource pool period, a D2D synchronization signal resource, and a latest one before a D2D resource pool period start position a synchronization signal resource period, a synchronization signal resource, the D2D resource pool is used to transmit a D2D signal and/or D2D data, the D2D synchronization signal resource is used to transmit a D2D synchronization signal, and the D2D synchronization signal includes a second synchronization signal.
  • the apparatus further comprises a sending module configured to transmit the D2D broadcast channel PSBCH.
  • the determining module includes at least one of the following: the device determines the resource according to the indication message, where the indication message is carried in a physical channel used for resource information indication, or the indication message bearer In the D2D broadcast channel, the physical channel includes a newly defined physical channel; the device determines the resource according to the first synchronization signal that is searched; the device according to the first synchronization signal and the indication message that are searched Determining the resource, where the indication message is carried in a physical channel for resource information indication, or the indication message is carried in the D2D broadcast channel, where the physical channel includes a newly defined physical channel; The device determines the resource based on the pre-configured resource parameters.
  • the sending of the physical channel indicated by the resource information includes at least one of: a resource occupied by the sending of the physical channel is a first D2D subframe after the first synchronization signal, The period of the physical channel is greater than or equal to the period of the transmission of the synchronization signal; the resource occupied by the transmission of the physical channel is a pre-configured resource, wherein the pre-configured resource has a predetermined period and a predetermined offset.
  • the transmission priority of the physical channel is lower than the transmission priority of the cellular signal and/or the channel and higher than the transmission priority of the D2D signal and/or the D2D data; the time domain resource occupied by the transmission of the physical channel is used for the transmission a predetermined subframe of the synchronization resource of the first synchronization signal, where the frequency domain resource is a PRB other than a predetermined number of physical resource blocks PRB; and the time domain resource occupied by the transmission of the physical channel is not sent in the synchronization resource A subframe of a synchronization signal, the frequency domain resource is a PRB other than a predetermined number of physical resource pools PRB.
  • determining, by the device, the resource according to the first synchronization signal that is searched includes: determining, by the device, the resource according to a location of a subframe of the first synchronization signal that is searched.
  • the starting position of the resource is within a predetermined offset range after the searched subframe in which the first synchronization signal is located.
  • the determining, by the device, the resource according to the first synchronization signal and the indication message that is searched includes: after searching, by the device, the first synchronization signal, where the first synchronization signal is found
  • the subframe is a reference, and the resource is determined in conjunction with the content of the indication message.
  • Another embodiment of the present invention provides a computer storage medium storing execution instructions for performing the method described above.
  • the device searches for a first synchronization signal, and determines whether to transmit a second synchronization signal according to the search result; the device determines a resource for D2D transmission based on the search for the first synchronization signal; D2D signal and/or D2D Data is transmitted on the resource.
  • FIG. 1 is a schematic diagram of cellular communication of a UE located in a same base station cell in the related art
  • FIG. 2 is a schematic diagram of D2D communication of UEs located in the same base station cell in the related art
  • FIG. 3 is a schematic diagram of a radio resource structure in the related art
  • FIG. 4 is a schematic diagram of network deployment of a cellular wireless communication system in the related art
  • FIG. 5 is a flowchart of a D2D transmission method according to an embodiment of the present invention.
  • FIG. 6 is a structural block diagram of a D2D transmission apparatus according to an embodiment of the present invention.
  • FIG. 7 is a structural block diagram of a synchronization module 62 in a D2D transmission apparatus according to an embodiment of the present invention.
  • FIG. 8 is a block diagram showing a preferred structure of a D2D transmission apparatus according to an embodiment of the present invention.
  • FIG. 9 is a first schematic diagram 1 showing a scan window width and a period distribution of a D2D sync signal according to a first embodiment of the present invention.
  • FIG. 10 is a second schematic diagram of a scan window width and a period distribution of a D2D sync signal according to a first embodiment of the present invention
  • FIG. 11 is a first schematic diagram of transmitting a D2D synchronization signal according to a third embodiment of the present invention.
  • FIG. 12 is a second schematic diagram of transmitting a D2D synchronization signal according to Embodiment 3 of the present invention.
  • FIG. 13 is a first schematic diagram of transmitting a newly defined physical channel according to Embodiment 5 of the present invention.
  • FIG. 14 is a second schematic diagram of transmitting a newly defined physical channel according to Embodiment 5 of the present invention.
  • FIG. 15 is a third schematic diagram of transmitting a newly defined physical channel according to Embodiment 5 of the present invention.
  • the discussion of D2D discovery is only for coverage scenarios, and does not consider coverage outside coverage.
  • the WI for the coverage enhancement enhanced by half coverage and coverage has been passed at the #66 plenary. It is determined that the R13 phase is to extend the Type 1 discovery to the semi-coverage scenario and the out-of-coverage scenario as a public safety net application.
  • the problems to be solved are mainly the synchronization of the D2D UE and the determination of the discovery resource pool.
  • the UE can refer to the conclusion of R12 in some aspects, such as the configuration and period of the D2D synchronization signal resource, and the pre-configuration of the resource pool.
  • the out-of-coverage discovery UE needs to obtain timing synchronization with the intra-coverage discovery UE, and sends/receives a discovery signal within the resource aligned with the intra-coverage discovery resource pool, so as to achieve mutual discovery with the intra-coverage UE. At the same time, it does not interfere with cellular communication. It can be seen that to achieve the half-coverage scenario and the out-of-coverage scenario expansion of Type 1 discovery, the above problem needs to be solved.
  • a D2D discovery method is proposed to solve the problem of synchronization and discovery of Type 1 discovery in a half-coverage scenario and an out-of-coverage scenario application.
  • a common cellular radio communication system can be based on Code Division Multiplexing Access (CDMA) technology, Frequency Division Multiplexing Access (FDMA) technology, and orthogonal frequency division multiple access (Orthogonal-FDMA). , referred to as OFDMA) technology, single carrier frequency division multiple access (Single Carrier-FDMA, referred to as SC-FDMA) technology, and so on.
  • CDMA Code Division Multiplexing Access
  • FDMA Frequency Division Multiplexing Access
  • Orthogonal-FDMA orthogonal frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • a radio resource for communication is a form of time-frequency two-dimensional.
  • uplink and downlink communication resources are divided in units of radio frames in the time direction, and each radio frame has a length of 10 ms, including There are 10 sub-frames of length 1 ms, each of which includes two slots of 0.5 ms in length.
  • FIG. 3 is a schematic diagram of a radio resource structure in the related art.
  • each time slot may include 6 or 7 OFDM or SC-FDM symbols.
  • resources are divided into subcarriers.
  • the smallest unit of frequency domain resource allocation is a resource block (Resource Block, RB for short), and one physical resource block corresponding to a physical resource (Physical RB). , referred to as PRB).
  • a PRB contains 12 sub-carriers in the frequency domain, corresponding to one slot in the time domain.
  • a resource corresponding to one subcarrier on each OFDM/SC-FDM symbol is referred to as a Resource Element (RE).
  • RE Resource Element
  • the user equipment UE discovers the LTE network by detecting a synchronization signal (Synchronization Signal, SS for short).
  • the synchronization signal includes a primary synchronization signal (Primary SS, referred to as PSS) and a secondary synchronization signal (Secondary SS, SSS for short).
  • PSS Primary synchronization signal
  • SSS secondary synchronization signal
  • the UE obtains the same downlink frequency and time as the base station. step.
  • the synchronization signal carries the physical cell identity
  • detecting the synchronization signal also means that the UE discovers the LTE/LTE-A cell.
  • the UE On the uplink, when the UE has uplink data transmission, it is required to initiate random access (Random Access, RA for short) for uplink synchronization and establish a Radio Resource Control (RRC) connection, that is, from RRC idle ( The Idle) state enters the RRC Connected state.
  • RRC Radio Resource Control
  • the UE needs to send a random access preamble (preamble) during random access, and the network side detects the random access preamble in a specific time-frequency resource to implement identification of the UE and synchronization of the uplink.
  • FIG. 4 is a schematic diagram of network deployment of a cellular wireless communication system in the related art. Shown in Figure 4 may be a 3GPP LTE/LTE-A system, or other cellular wireless communication technology.
  • the network device In an access network of a cellular radio communication system, the network device generally includes a certain number of base stations (Base Station, or BS for short, or Node B, or evolved Node B, evolved Node B, referred to as An eNB, or an enhanced Node B, referred to as an eNB, and other network entities or network elements. Or, in general, it can also be collectively referred to as an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) in the 3GPP.
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • the base station mentioned here also includes a low power node (Low Power Node, LPN for short) in the network, such as a femto cell or a home base station (pico, relay, femto, HeNB, Home eNB, etc.).
  • LPN Low Power Node
  • Figure 4 shows only three base stations.
  • the base station provides a certain wireless signal coverage, and a terminal (also referred to as a user equipment, User Equipment, UE, or device) in the coverage area can perform wireless communication with the base station.
  • the radio signal coverage area of a base station may be divided into one or more cell cells or sector sectors based on certain criteria, for example, may be three cells.
  • the transmitting end UE and the receiving end UE refer to the same timing reference to complete the transmission and reception of the D2D signal/data.
  • the receiving end UE needs to be based on the same D2D resource configuration parameter as the transmitting end UE, otherwise the D2D signal/data reception cannot be completed correctly.
  • D2D discovery is only applicable to in-coverage scenarios.
  • the base station configures the resource parameters for the UE to be discovered by using the RRC parameter, so that the resource configuration parameters of the UE at the receiving end and the UE at the transmitting end are the same.
  • the timing synchronization between the discovery UEs of the half-coverage scenario and the out-of-coverage scenario is first solved, and the resource pool alignment between the transmitting UE and the receiving UE is found. problem.
  • the present invention provides a D2D discovery method, which solves the problem of synchronization and discovery resource pool determination of Type 1 discovery in the LTE R13 phase.
  • FIG. 5 is a flowchart of a D2D transmission method according to an embodiment of the present invention. As shown in FIG. 5, the flow includes the following steps:
  • Step S502 the device searches for the first synchronization signal, and determines whether to send the second synchronization signal according to the search result.
  • Step S504 the device determines a resource for D2D transmission on the basis of searching for the first synchronization signal
  • step S506 the D2D signal and/or the D2D data are transmitted on the resource.
  • the device performs D2D synchronization by searching for a synchronization signal and transmitting a synchronization signal, and After determining the resources for D2D transmission, the D2D signal and/or the D2D data may be transmitted on the determined resource, where the transmission of the D2D signal and/or the D2D data may be receiving the D2D signal and/or the D2D data.
  • the device searches for the first synchronization signal, and determining whether to send the second synchronization signal according to the search result may include at least one of the following: if the first synchronization signal is not searched after searching for one scanning window, the device searches in the next scanning window. a first synchronization signal; if the first synchronization signal is not searched after searching a scanning window, the device transmits the second synchronization signal as an independent synchronization source; if the traversal search for the scanning window in one cycle is completed, the first search is not found.
  • the synchronization signal the device transmits the second synchronization signal as an independent synchronization source.
  • the period length of the one cycle may be the period length of the D2D discovery resource pool period and/or the period length of the D2D communication resource pool period; the traversal search described above is performed by using the scan window as a time unit. A search for all time periods within the range of the period length of a cycle.
  • the foregoing device searches for the first synchronization signal, and determining whether to send the second synchronization signal according to the search result may include: the device selects a synchronization source after searching for the first synchronization signal, and is in the scan window. Searching for a new synchronization signal; if a new synchronization signal is searched, the device selects a device with a higher priority as a new synchronization source from the selected synchronization source and the device transmitting the new synchronization signal; the device transmits a second synchronization signal Wherein the timing at which the second synchronization signal is transmitted is the timing of the new synchronization source.
  • the length of the scanning window may be a fixed value or a pre-configured value; the distribution period of the scanning window is a fixed value or a pre-configured value; and the search range of the above device is the length of one scanning window.
  • the determining, by the device, whether to send the second synchronization signal according to the search result includes: determining, by the device, whether a transmission condition for transmitting the second synchronization signal is met, where the sending condition includes: the device needs to send the D2D Signal and/or D2D data, and the power of the first synchronization signal pre-searched by the device is lower than a preset threshold, and the device searches for two or more synchronization signals of different priorities; if the judgment result is yes, the device Transmitting a second synchronization signal according to a first synchronization signal that is pre-searched by the device or a synchronization signal that has been sent by the device, where the device is each D2D synchronization signal in a D2D resource pool period when transmitting the second synchronization signal.
  • the resource period or the D2D synchronization signal resource is used for transmitting the D2D signal and/or the D2D data, where the synchronization signal resource is used to send the synchronization signal; or, in the case that the determination result is yes, the device Transmitting a second synchronization signal, wherein the device is each synchronization in the D2D resource pool period when transmitting the second synchronization signal.
  • the resource period and/or the latest synchronization signal resource period or synchronization signal resource before the D2D synchronization signal resource and/or the D2D resource pool period start position is used for transmitting the D2D signal and/or the D2D data.
  • the synchronization signal resource is used to send a synchronization signal.
  • the sending, by the foregoing device, the second synchronization signal according to the first synchronization signal that is previously searched by the device includes: the device transmitting the second synchronization signal on a D2D synchronization resource different from the D2D synchronization resource that searches for the first synchronization signal in advance.
  • the second synchronization signal sent by the device is the same as the sequence of the first synchronization signal that the device searches for in advance.
  • the device further includes at least one of the following: The D2D signal and/or the D2D data are to be sent in the D2D resource pool period to terminate the transmission of the synchronization signal; the device terminates the transmission of the synchronization signal after transmitting the synchronization signal; the device terminates the transmission of the synchronization signal after re-searching for the synchronization signal; The transmission of the synchronization signal is terminated after the timing of the pre-searched synchronization signal expires.
  • the method further includes: sending a D2D broadcast channel (Physical Sidelink Broadcast Channel, PSBCH for short).
  • a D2D broadcast channel Physical Sidelink Broadcast Channel, PSBCH for short.
  • the sending of the D2D broadcast channel may be sent by the foregoing device.
  • the foregoing device determines that the resource used for the D2D transmission includes at least one of the following: the device determines the resource according to the indication message, where the indication message is carried in a physical channel used for the resource information indication, or the indication message is sent in advance.
  • the physical channel includes a newly defined physical channel; the device determines a resource according to the first synchronization signal that is searched; the device determines a resource according to the first synchronization signal and the indication message that is searched, wherein the indication message is used In the physical channel indicated by the resource information, or the indication message is carried in a pre-transmitted D2D broadcast channel PSBCH, the physical channel includes a newly defined physical channel; the device determines the resource according to the pre-configured resource parameter.
  • the sending of the physical channel for the resource information indication includes at least one of the following: the resource occupied by the sending of the physical channel is the first D2D subframe after the first synchronization signal, The sending period of the physical channel is greater than or equal to the period of sending the synchronization signal; the resource occupied by the sending of the physical channel is a pre-configured resource, wherein the pre-configured resource has a predetermined period and a predetermined offset, and the physical channel
  • the transmission priority is lower than the transmission priority of the cellular signal and/or the channel and is higher than the transmission priority of the D2D signal and/or the D2D data;
  • the time domain resource occupied by the transmission of the physical channel is the synchronization for transmitting the first synchronization signal a predetermined subframe of the resource, the frequency domain resource is a PRB other than the intermediate predetermined number of physical resource blocks PRB; the time domain resource occupied by the transmission of the physical channel is a subframe in which the first synchronization signal is not sent in the synchronization resource
  • the determining, by the device, the resource according to the first synchronization signal that is searched includes: the device determining the resource according to the location of the subframe of the first synchronization signal that is searched.
  • the starting position of the resource is within a predetermined offset range after the sub-frame in which the searched first synchronization signal is located.
  • Determining the resource according to the first synchronization signal and the indication message that is searched by the device after the device searches for the first synchronization signal, using the searched subframe of the first synchronization signal as a reference, and determining the content of the indication message Resources.
  • the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation.
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (eg, ROM/RAM, disk, and optical disk include instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the methods of various embodiments of the present invention.
  • a device-to-device D2D transmission device is further provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and has not been described again.
  • the term “module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 6 is a structural block diagram of a D2D transmission apparatus according to an embodiment of the present invention. As shown in FIG. 6, the apparatus is applied to a device, including a search module 62, a determination module 64, and a transmission module 66, which will be described below.
  • the searching module 62 is configured to search for the first synchronization signal, and determine whether to send the second synchronization signal according to the search result;
  • the determining module 64 is connected to the search module 62, and is configured to determine the D2D transmission based on the search for the first synchronization signal.
  • the resource module 66 is coupled to the determining module 64 and configured to transmit the D2D signal and/or the D2D data on the resource.
  • the search module 62 includes at least one of the following: if the first synchronization signal is not searched after searching a scan window, the device searches for the first synchronization signal in the next scan window; if the search window does not search after searching for a scan window a first synchronization signal, the device transmitting the second synchronization signal as an independent synchronization source; if the first synchronization signal is not searched after completing the traversal search for the scan window in one cycle, the device transmits the second synchronization signal as an independent synchronization source .
  • the period length of the foregoing one cycle is the period length of the D2D discovery resource pool period and/or the period length of the D2D communication resource pool period; the traversal search includes completing all the time in the period of the period length of one period by using the scan window as a time unit. Segment search.
  • FIG. 7 is a structural block diagram of a search module 62 in a D2D transmission apparatus according to an embodiment of the present invention. As shown in FIG. 7, the search module 62 includes a search unit 72, a selection unit 74, and a transmitting unit 76, which will be described below. .
  • the searching unit 72 is configured to select a synchronization source after searching for the first synchronization signal and search for a new synchronization signal in the scan window;
  • the selection unit 74 is connected to the search unit 72, and is set to if a new synchronization signal is searched, a device having a higher priority from the selected synchronization source and the device transmitting the new synchronization signal as a new synchronization source;
  • the transmitting unit 76 is connected to the selection unit 74, configured to transmit a second synchronization signal, wherein the second synchronization signal is transmitted
  • the timing of the sync signal is the timing of the new sync source.
  • the length of the scan window is a fixed value or a pre-configured value; the distribution period of the scan window is a fixed value or a pre-configured value; the above search range of the device is one.
  • the length of the scan window is a fixed value or a pre-configured value; the distribution period of the scan window is a fixed value or a pre-configured value; the above search range of the device is one. The length of the scan window.
  • determining, by the foregoing device, whether to send the second synchronization signal according to the search result comprises: determining, by the device, whether a transmission condition for transmitting the second synchronization signal is met, wherein the sending condition includes at least one of the following: The device needs to send a D2D signal and/or D2D data, and the power of the first synchronization signal that is pre-searched by the device is lower than a preset threshold, and the device searches for two or more synchronization signals of different priorities; In the case that the device sends a second synchronization signal according to the first synchronization signal pre-searched by the device or the synchronization signal that the device has sent, wherein the device is in the D2D resource pool period when transmitting the second synchronization signal.
  • Each D2D sync signal resource period or The D2D synchronization signal resource is used for transmitting, and the D2D resource pool is configured to send a D2D signal and/or D2D data, where the synchronization signal resource is used to send a synchronization signal; or, if the determination result is yes, the device sends a second synchronization.
  • the device transmits the second synchronization signal as the most recent synchronization signal before each synchronization signal resource period and/or D2D synchronization signal resource and/or D2D resource pool period start position within the D2D resource pool period
  • the resource period or synchronization signal resource is sent, and the D2D resource pool is used to send a D2D signal and/or D2D data, and the synchronization signal resource is used to send a synchronization signal.
  • the transmitting, by the foregoing device, the second synchronization signal according to the first synchronization signal that is pre-searched by the device includes: the device transmitting the second synchronization signal on a synchronization resource different from the pre-searched first synchronization signal.
  • the second synchronization signal sent by the device is the same as the sequence of the first synchronization signal that the device searches for in advance.
  • the device further includes at least one of the following: the device Terminating the transmission of the D2D synchronization signal in the D2D resource pool period in which no D2D signal and/or D2D data is to be transmitted; the device terminates transmitting the synchronization signal after transmitting the synchronization signal; the device terminates transmitting the synchronization signal after re-searching for the synchronization signal The device terminates transmitting the synchronization signal after the timing of the pre-searched synchronization signal expires.
  • FIG. 8 is a block diagram showing a preferred structure of a D2D transmission apparatus according to an embodiment of the present invention.
  • the apparatus includes a transmitting module 82, the transmitting module 82, and FIG. 6 in addition to all the modules shown in FIG.
  • the location relationship of each module may be various. The following is to first transmit the D2D broadcast channel and then determine the resource for explanation.
  • the sending module 82 is connected to the above determining module 64 and configured to transmit the PSBCH of the D2D broadcast channel.
  • the determining module 64 includes at least one of: determining a resource according to the indication message, where the indication message is carried in a physical channel for indicating the resource information, or the indication message is carried on the In the pre-transmitted D2D broadcast channel PSBCH, the physical channel includes a newly defined physical channel; the resource is determined according to the searched first synchronization signal; and the resource is determined according to the searched first synchronization signal and the indication message, wherein the indication message is carried in the In the physical channel indicated by the resource information, or the indication message is carried in a pre-transmitted D2D broadcast channel PSBCH, the physical channel includes a newly defined physical channel; and the resource is determined according to the pre-configured resource parameter.
  • the foregoing sending of the physical channel for the resource information indication includes at least one of the following: the resource occupied by the transmission of the physical channel is the first D2D subframe after the first synchronization signal, where the transmission period of the physical channel is greater than or Equal to the period in which the D2D synchronization signal is sent; the resource occupied by the transmission of the physical channel is a pre-configured resource, wherein the pre-configured resource has a predetermined period and a predetermined offset, and the physical channel has a lower transmission priority than the cellular signal and/or The transmission priority of the channel is higher than the transmission priority of the D2D signal and/or the D2D data; the time domain resource occupied by the transmission of the physical channel is a predetermined subframe for transmitting the synchronization resource of the first synchronization signal, and the frequency domain resource is a PRB other than the predetermined number of physical resource blocks PRB; the time domain resource occupied by the transmission of the physical channel is a subframe in which the first synchronization signal is not sent in the
  • the determining, by the device, the resource according to the first synchronization signal that is searched includes: determining, by the device, the resource according to the location of the subframe of the first synchronization signal that is searched.
  • the starting position of the above resource is within a predetermined offset range after the sub-frame in which the searched first synchronization signal is located.
  • the foregoing determining, by the device, the foregoing resource according to the first synchronization signal and the indication message that is: after the device searches for the first synchronization signal, the subframe in which the first synchronization signal is searched is Referring to the content of the indication message, the above resources are determined.
  • each of the above modules may be implemented by software or hardware.
  • the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are located in multiple In the processor.
  • Embodiments of the present invention also provide a storage medium.
  • the foregoing storage medium may be configured to store program code for performing the following steps:
  • the device searches for the first synchronization signal, and determines whether to send the second synchronization signal according to the search result.
  • the device determines a resource used for D2D transmission on the basis of searching for the first synchronization signal
  • the foregoing storage medium may include, but is not limited to, a USB flash drive, a Read-Only Memory (ROM), and a Random Access Memory (RAM).
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • the out-of-band D2D UE (the same as the above-mentioned device) can search for the D2D synchronization signal by continuously scanning the frequency domain in which the D2D synchronization signal is located to obtain the D2D synchronization source without currently obtaining the synchronization source.
  • the synchronization source obtained by the D2D UE is a D2D UE.
  • the out-of-coverage UE preferentially synchronizes to the synchronization source within the coverage, including the discovery UE and/or the communication UE.
  • the intra-coverage discovery UE transmits the D2D synchronization signal at most once in one discovery resource pool period.
  • the out-of-coverage UE searches for D2D synchronization through continuous scanning. If you signal, the search will take a long time. Therefore, the out-of-coverage UE can also search for the D2D synchronization signal by scanning by scanning window. For example, setting the period of the scan window and the scan window distribution, the coverage discovery UE scans and searches for the D2D synchronization signal within the scan window according to the scan window distribution period, and the range of each scan search is the length of one scan window, and the length and distribution of the scan window.
  • the period can be set to a fixed value or pre-configured.
  • the length of the scan window can be set to 40ms, 80ms, 100ms, 120ms, 160ms, 320ms, etc.
  • the distribution period of the scan window can be set to 40ms, 80ms, 160ms, 320ms, 640ms, 1280ms, 2560ms, 5120ms, 10240ms, etc.
  • FIG. 9 is a first schematic diagram of a scan window width and a period distribution of a D2D sync signal according to a first embodiment of the present invention
  • FIG. 10 is a second schematic diagram of a scan window width and period distribution of a D2D sync signal according to a first embodiment of the present invention
  • FIG. 9 and FIG. 10 is shown
  • the scanning window has a length of 40 ms
  • the scanning window has a distribution period of (10240 + 40) ms.
  • the scanning window has a length of 40 ms
  • the scanning window has a distribution period of 80 ms.
  • the offset of the scan window relative to the start position of the 10240 ms period differs by plus or minus 40 ms.
  • the UE searches for the D2D synchronization signal by scanning in the scan window.
  • One solution is to find that the UE scans in the scan window in turn until the D2D synchronization signal is searched. If the traversal search for the discovery resource pool period length is completed and the D2D synchronization signal has not been searched, the out-of-coverage UE is sent as an independent synchronization source to transmit the D2D synchronization signal in the D2D discovery resource pool period to which the D2D discovery signal is to be transmitted, or Sending a D2D synchronization signal and a D2D broadcast channel (PSBCH for short), after the D2D discovery resource pool period to be transmitted by the D2D discovery signal is ended, the D2D synchronization signal is stopped, or the D2D synchronization signal is stopped.
  • PSBCH D2D broadcast channel
  • a D2D broadcast channel Physical Sidelink Broadcast Channel, PSBCH for short
  • PSBCH Physical Sidelink Broadcast Channel
  • the traversal search for the discovery resource pool period length is completed, that is, the scan window covers all time domain segments within the discovery resource pool period length. For example, for a discovery resource pool period of 10240 ms, if the scan window width of 40 ms is used, and the scan window distribution period of (10240+40) ms, then after 256 scans, the scan window has covered the discovery resource pool period (10240 ms). All time domain ranges in the middle, that is, the search for all time domain ranges in the length of 10240ms is completed.
  • the D2D discovery signal is used as the independent synchronization source.
  • the scan window is set to a length of 40 ms, and the distribution period of the scan window is (320+40) ms.
  • the discovery UE sends the D2D as an independent synchronization source. Synchronization signal, or transmit D2D synchronization signal and D2D broadcast channel (PSBCH).
  • PSBCH D2D broadcast channel
  • the new D2D synchronization signal searched in the scan window is based on the timing reference of the synchronization source obtained. If the new D2D synchronization signal is searched, the D2D UE is based on the synchronization source. Priority criteria, reselect the synchronization source.
  • the length and distribution period of the scanning window are fixed or pre-configured, and the width of the scanning window can be set to 40ms, 60ms, 80ms, 100ms, 120ms, 160ms, etc., and the distribution period of the scanning window can be set to 40ms, 80ms, 160ms, 320ms, 640ms, 1280ms, 2560ms, 5120ms, 10240ms, etc.
  • the D2D UE In searching for time domain resources within the scan window of the new D2D synchronization signal, the D2D UE does not transmit D2D synchronization signals and/or channels and D2D signals and/or data.
  • the coverage of the internal synchronization source UE is superior
  • the priority is higher than the coverage external synchronization source UE.
  • the synchronization source UE corresponding to the detected D2D synchronization signal with high received power has a higher priority.
  • the synchronization source UE here is a discovery UE and/or a communication UE.
  • the D2D UE synchronizes to the synchronization source with a higher priority according to the priority criterion. For example, if the UE is found to search for a high-priority synchronization source within a certain discovery resource pool period, the UE is found to complete the transmission and reception of the discovery signal in the current discovery resource pool period, and stops after the current discovery resource pool period ends.
  • D2D synchronization signal sent by the current synchronization source, or stop transmitting the D2D synchronization signal and the D2D broadcast channel (Physical Sidelink Broadcast Channel, PSBCH for short), and switch to a new synchronization source.
  • D2D broadcast channel Physical Sidelink Broadcast Channel, PSBCH for short
  • the UE In parallel, if the UE is found to be out of coverage (the discovery UE of R13) moves into the coverage, it is found that the UE preferentially synchronizes to the base station through the downlink synchronization signal of the cellular system.
  • the D2D synchronization resource period is periodically set, for example, 40 ms, 80 ms, or 160 ms, and one D2D synchronization resource is configured for each D2D synchronization resource period, and multiple D2D synchronization resources, such as two or three, may also be configured. . If one D2D synchronization resource is configured for each D2D synchronization resource period, the offset of the D2D synchronization resource is the same as the offset of the D2D synchronization resource of the UE within the R12 coverage.
  • the offset of the D2D synchronization resource is SFN (System Frame Number).
  • the offset of the D2D synchronization resource relative to SFN#0 or DFN#0 in the first D2D synchronization resource period in the DFN (Direct Frame Number) cycle with a granularity of 1 subframe. If two D2D synchronization resources are configured for each D2D synchronization resource period, the offset of the first D2D synchronization resource in the D2D synchronization resource period is the same as the offset of the D2D synchronization resource of the UE within the R12 coverage.
  • the period of discovery that the UE transmits the D2D synchronization resource is that the D2D synchronization signal is sent at most once in each discovery resource period. If more than one D2D synchronization resource is configured in each D2D synchronization resource period, a D2D synchronization resource is arbitrarily selected to transmit a D2D synchronization signal, or is fixed in one D2D synchronization resource, such as a first D2D synchronization resource.
  • the out-of-coverage discovery UE sends the D2D synchronization resource period to send the D2D synchronization signal once for the N D2D synchronization resource periods, where N may be a positive integer.
  • the resource sends a D2D sync signal.
  • a D2D synchronization resource period is left, and the D2D synchronization signal is transmitted.
  • the D2D synchronization signal may be selected to be transmitted in the first D2D synchronization resource in the D2D synchronization resource period, or the second D2D synchronization resource in the D2D synchronization resource period may be selected to transmit the D2D synchronization signal.
  • the transmitting D2D synchronization signal described above also includes simultaneous transmission Send D2D broadcast channel (PSBCH).
  • PSBCH simultaneous transmission Send D2D broadcast channel
  • the out-of-coverage UE may send the D2D synchronization signal according to the detected D2D synchronization signal, and the following options are available:
  • Mode 1 If the out-of-coverage discovery UE can detect the D2D synchronization signal in the D2D synchronization resource, the discovery UE transmits the D2D synchronization signal in the next D2D synchronization resource or the D2D synchronization resource period of the D2D synchronization resource that detects the D2D synchronization signal, or Sending a D2D synchronization signal and a D2D broadcast channel (Physical Sidelink Broadcast Channel, PSBCH for short), stopping transmitting the D2D synchronization signal once after transmitting, or stopping transmitting the D2D synchronization signal and the Physical Sidelink Broadcast Channel (PSBCH), and Re-detect the D2D sync signal.
  • a D2D broadcast channel Physical Sidelink Broadcast Channel, PSBCH for short
  • PSBCH Physical Sidelink Broadcast Channel
  • the transmit D2D sync signal is based on the timing reference of the detected D2D sync signal, and the sequence of the transmitted D2D sync signal is the same as the sequence of the detected D2D sync signal. If the UE is found to not detect the D2D synchronization signal in the D2D synchronization resource, it is found that the UE does not transmit the D2D synchronization signal in the next D or D D2D synchronization resource or the D2D synchronization resource period of the D2D synchronization resource that does not detect the D2D synchronization signal.
  • M may be a positive integer, or all D2D synchronization resources after the D2D synchronization resource that does not detect the D2D synchronization signal within the current discovery resource pool period does not transmit the D2D synchronization signal, nor does not send the D2D. Broadcast Channel (PSBCH).
  • PSBCH Broadcast Channel
  • FIG. 11 is a schematic diagram 1 of transmitting a D2D synchronization signal according to Embodiment 3 of the present invention.
  • the D2D synchronization resource period is 40 ms, and the D2D synchronization of the UE is found in the D2D synchronization resource period.
  • the resource detects the D2D synchronization signal the D2D synchronization signal is transmitted in the next D2D synchronization resource, and the transmitted D2D synchronization signal is the same as the detected D2D synchronization signal sequence; if the D2D synchronization signal is not detected, the D2D synchronization resource is not transmitted in the next D2D synchronization resource. Synchronization signal.
  • one D2D synchronization resource may be configured in one D2D synchronization resource period, and the D2D synchronization resources and the D2D synchronization resources for transmitting the D2D synchronization signal are respectively detected. Synchronize resource cycles in different D2D.
  • the transmission of the D2D synchronization signal in this example description includes transmitting a D2D synchronization signal, or transmitting a D2D synchronization signal and a D2D broadcast channel (PSBCH).
  • PSBCH D2D broadcast channel
  • the UE if the UE is found to be able to detect the D2D synchronization signal in the D2D synchronization resource, it is found that the UE transmits the D2D synchronization signal or the D2D synchronization resource in the next D2D synchronization resource of the D2D synchronization resource of the D2D synchronization signal, or sends the D2D synchronization signal.
  • the D2D synchronization signal and the D2D synchronization channel stop transmitting the D2D synchronization signal after one transmission, or stop transmitting the D2D synchronization signal and the D2D broadcast channel (Physical Sidelink Broadcast Channel, PSBCH for short), and re-detect the D2D synchronization signal.
  • PSBCH Physical Sidelink Broadcast Channel
  • the transmit D2D sync signal is based on the timing reference of the detected D2D sync signal, and the sequence of the transmitted D2D sync signal is the same as the sequence of the detected D2D sync signal. If the UE is found to not detect the D2D synchronization signal in the D2D synchronization resource, it is found that the UE repeatedly transmits the D2D synchronization resource period in which the D2D synchronization resource of the D2D synchronization signal is not detected and the next or M D2D synchronization resource period.
  • the D2D synchronization signal and the D2D broadcast channel Physical Sidelink Broadcast Channel, PSBCH for short
  • the next or M D2D synchronization resources of the resource repeatedly transmit the D2D synchronization signal transmitted before the D2D synchronization resource that does not detect the D2D synchronization signal, or transmit the D2D synchronization signal and the D2D broadcast channel (Physical Sidelink Broadcast Channel, PSBCH for short)
  • M is a positive integer
  • the previously transmitted D2D synchronization signal may be the most recently before the D2D synchronization resource of the D2D synchronization signal is detected.
  • the D2D synchronization signal detected at one time may also be a D2D synchronization signal that is repeatedly transmitted before the D2D synchronization resource of the D2D synchronization signal is not detected.
  • the transmission of the D2D synchronization signal is terminated after the timing of the D2D synchronization signal transmitted before the D2D synchronization resource of the D2D synchronization signal is detected is timed out.
  • FIG. 12 is a schematic diagram 2 of transmitting a D2D synchronization signal according to Embodiment 3 of the present invention.
  • the D2D synchronization resource period is 40 ms, and the D2D synchronization of the UE is found in the D2D synchronization resource period.
  • the resource detects the D2D synchronization signal the D2D synchronization signal is transmitted on the next D2D synchronization resource, and the transmitted D2D synchronization signal is the same as the detected D2D synchronization signal sequence; if the D2D synchronization signal is not detected, the next D2D synchronization resource is repeatedly transmitted.
  • a D2D sync signal sent at a time.
  • the D2D synchronization signal is transmitted once in each D2D synchronization resource period.
  • the transmission of the D2D synchronization signal in this example description includes transmitting a D2D synchronization signal, or transmitting a D2D synchronization signal and a D2D broadcast channel (PSBCH).
  • PSBCH D2D broadcast channel
  • the UE when the UE is found to move into the coverage, the UE is found to send the D2D synchronization signal once for each D2D synchronization resource period corresponding to the discovery resource pool period with the discovery signal.
  • a method for transmitting a D2D synchronization signal, in a D2D resource pool period in which a D2D signal is to be transmitted the D2D UE transmits a D2D synchronization signal in each D2D synchronization signal resource period or D2D synchronization signal resource. For example, if the discovery UE in the network coverage determines that the D2D synchronization signal resource coincides with the first D2D subframe in the D2D discovery resource pool period, the discovery UE transmits the first D2D subframe in the D2D discovery resource pool period. The D2D synchronization signal, meanwhile, also transmits a D2D synchronization signal for all other D2D synchronization signal resource periods in the D2D discovery resource pool period.
  • the D2D UE transmits a D2D synchronization signal in each D2D synchronization signal resource period or D2D synchronization signal resource, and, in the D2D resource pool period in which the D2D signal is to be transmitted.
  • the D2D sync signal resource period or the D2D sync signal resource closest to the start position also transmits a D2D sync signal.
  • the discovery UE in the network coverage determines that the first D2D subframe in the D2D discovery resource pool period is not a D2D synchronization signal resource, then the discovery D2D synchronization signal resource of the UE before the D2D resource pool period start position is sent to the D2D.
  • the synchronization signal, and all D2D synchronization signal resource periods or D2D synchronization resources in the D2D resource pool period transmit D2D synchronization signals.
  • the resources for D2D transmission herein may also be referred to as D2D resource pools, and the D2D resource pools include D2D discovery resource pools or D2D communication resource pools.
  • the D2D UE transmits and/or receives D2D signals and/or data in D2D subframes within the D2D resource pool.
  • the D2D resource pool can be determined according to the following options.
  • the D2D resource pool is determined by the indication message, and the indication message carries the D2D resource pool configuration parameter, and the indication message is carried by the newly defined physical channel.
  • the newly defined physical channel can be sent with the D2D sync signal.
  • the transmitting end UE of the discovery signal is transmitting D2D.
  • the first D2D subframe after the synchronization signal transmits a newly defined physical channel, and the transmission period is the same as or greater than the transmission period of the D2D synchronization signal.
  • 13 is a first schematic diagram of transmitting a newly defined physical channel according to Embodiment 5 of the present invention.
  • the UE is found to transmit a D2D synchronization signal on the D2D synchronization resources 1300, 1302, and 1304, and then in the D2D subframes 1301 and 1303.
  • 1305 sends a newly defined physical channel, and carries an indication message of the discovery resource pool.
  • the newly defined physical channel can be sent at a determined period and offset.
  • the transmitting end UE of the discovery signal transmits a newly defined physical channel in a subframe corresponding to the determined period and offset, where the determined period and offset value may be fixed or pre-configured, wherein the granularity of the offset value is 1 subframe.
  • the newly defined physical channel transmission priority is lower than the cellular signal and channel, higher than the D2D signal and data, that is, when the subframe corresponding to the transmission of the newly defined physical channel is scheduled for transmitting cellular data, then the subframe is discarded.
  • the newly defined physical channel has a lower transmission priority than the cellular signal and channel, as well as the D2D signal and data.
  • FIG. 14 is a schematic diagram 2 of transmitting a newly defined physical channel according to Embodiment 5 of the present invention.
  • FIG. 14 is an example of transmitting a newly defined physical channel according to a determined period and an offset.
  • the UE is found in subframes 1400 and 1401.
  • the new defined physical channel is sent on 1402.
  • the period in which the newly defined physical channel is transmitted is N (positive integer) times of 40 ms, and the offset from the D2D synchronization resource subframe is K subframes, and K may be a positive integer.
  • the newly defined physical channel can be transmitted in a D2D synchronization resource subframe.
  • the transmitting end UE of the discovery signal transmits a newly defined physical channel in a subframe in which the synchronous resource of the D2D synchronization signal is not transmitted, and the time domain resource selects a subframe in which the D2D synchronization resource of the D2D synchronization signal is not transmitted, and the frequency domain resource selection intermediate 6 PRBs other than PRBs (in this embodiment, the middle 6 is a preferred embodiment, and PRBs other than a predetermined number of PRBs in the middle may also be selected).
  • 15 is a schematic diagram 3 of transmitting a newly defined physical channel according to Embodiment 5 of the present invention, and FIG.
  • FIG. 15 is an example of transmitting a newly defined physical channel in a D2D synchronization resource subframe, and FIG. 15 is found in the D2D synchronization resource sub.
  • the frames 900 and 903 transmit the D2D synchronization signal, and the D2D synchronization resource subframes 901, 902, and 904 do not transmit the D2D synchronization signal, but transmit the newly defined physical channel, and the frequency domain resource is a portion other than the middle 6 PRBs (also You can select a part other than the other predetermined number of PRBs in the middle).
  • the middle 6 PRBs also You can select a part other than the other predetermined number of PRBs in the middle.
  • all the subframes of the D2D synchronization resource that does not send the D2D synchronization signal are selected to transmit the newly defined physical channel, and a part of the D2D synchronization subframe transmission may also be selected, for example, after selecting the D2D synchronization subframe in which the D2D synchronization signal is transmitted.
  • the first D2D sync subframe is selected.
  • the transmitting end UE of the discovery signal transmits a newly defined physical channel in a subframe in which the synchronization resource of the D2D synchronization signal is transmitted, and the time domain resource selects the subframe in which the D2D synchronization signal resource of the D2D synchronization signal is transmitted or the discovery resource pool period
  • the first subframe in which the D2D synchronization signal resource of the D2D synchronization signal is transmitted transmits the newly defined physical channel.
  • the frequency domain resource selects a PRB other than the middle 6 PRBs (a PRB other than a predetermined number of other PRBs may also be selected).
  • the D2D resource pool is determined by detecting the D2D synchronization signal or/and the synchronization channel.
  • the UE After detecting the D2D synchronization signal, the UE can determine the subframe in which the D2D synchronization signal is located, and the D2D synchronization resource period is 40 ms.
  • the offset of the R12 discovery UE transmitting the D2D synchronization signal and the discovery resource pool is also less than 40 ms. Therefore, It can be determined that the starting subframe of the discovery resource pool is within a range of 40 ms after the subframe of the D2D synchronization signal, and the time domain range of the resource pool is discovered from the subframe of the D2D synchronization signal. It is found that after determining the D2D synchronization signal subframe, the UE can start to listen to the discovery signal, and it is possible to monitor the discovery signal within 40 ms.
  • the D2D resource pool is determined by combining the detection of the D2D synchronization signal or/and the synchronization channel with the indication message.
  • the UE can determine the subframe in which the D2D synchronization signal is located, and the D2D synchronization resource period is 40 ms.
  • the offset of the R12 discovery UE transmitting the D2D synchronization signal and the discovery resource pool is also It is less than 40 ms. Therefore, it is found that the UE can determine the starting position of the discovery resource pool within 40 ms after determining the D2D synchronization signal subframe according to the parameter content indicated by the indication message in combination with the indication message.
  • the UE determines the D2D discovery resource pool according to the pre-configured parameters by means of device pre-configuration.
  • the pre-configured parameters of the device can be consistent with the resource pool parameters configured in the coverage.
  • the value of the configuration parameter of the UE is kept as one of the optional parameter values.
  • the fixed resource pool period is set to 320ms, 640ms, and 1280ms.
  • the discovery resource pool period of the out-of-covery UE is pre-configured to one of the corresponding values.
  • transmitting the D2D synchronization signal in the description of the above embodiment includes transmitting the D2D synchronization signal, or transmitting the D2D synchronization signal and the D2D broadcast channel (PSBCH).
  • PSBCH D2D broadcast channel
  • Embodiments of the present invention also provide a storage medium.
  • an execution instruction is stored in the storage medium, and the execution instruction is used to execute the foregoing method.
  • the foregoing storage medium may include, but is not limited to, a USB flash drive, a Read-Only Memory (ROM), and a Random Access Memory (RAM).
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the device-to-device D2D transmission method and apparatus provided by the embodiments of the present invention have the following beneficial effects: solving the problem of D2D discovery between devices in a half-coverage and out-of-coverage scenario that cannot be implemented in the related art. In turn, the effect of achieving D2D discovery between devices is achieved.

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Abstract

本发明提供了一种设备到设备（D2D）传输方法及装置，其中，该方法包括：设备搜索第一同步信号，根据搜索结果确定是否发送第二同步信号；该设备在搜索第一同步信号的基础上确定用于D2D传输的资源；D2D信号和/或D2D数据在所述资源上传输。通过本发明，解决相关技术中存在的无法实现半覆盖和覆盖外场景下的设备之间的D2D发现的问题，进而达到了实现设备之间的D2D发现的效果。

Description

设备到设备D2D传输方法及装置 技术领域
本发明涉及通信领域，具体而言，涉及一种设备到设备D2D传输方法及装置。
背景技术
在蜂窝通信系统中，当两个用户设备(User Equipment，简称为UE)之间有业务传输时，例如，用户设备1(UE1)到用户设备2(UE2)的业务数据，首先通过空口传输给UE1所在小区的基站(Base Station，简称为BS，或者也可以称为Node B，或演进(evolved)Node B)，该基站通过核心网将该用户数据传输给UE2所在小区的基站，该基站再将上述业务数据通过空口传输给UE2。UE2到UE1的业务数据传输采用类似的处理流程。如图1所示，图1是相关技术中的位于同一基站小区的UE的蜂窝通信示意图，当UE1和UE2位于同一个蜂窝小区，虽然两个UE由同一个基站的小区覆盖，数据传输时仍然需要通过核心网中转，并且一次数据传输仍然会消耗两份无线频谱资源。
由此可见，如果用户设备1和用户设备2相距较近，那么上述的蜂窝通信方法显然不是最优的。而实际上，随着移动通信业务的多样化，例如，社交网络、电子支付等应用在无线通信系统中的普及，使得近距离用户之间的业务传输需求日益增长。因此，设备到设备(Device-to-Device，简称为D2D)的通信模式日益受到广泛关注。如图2所示，图2是相关技术中的位于同一基站小区的UE的D2D通信示意图，D2D是指业务数据不经过基站和核心网的转发，直接由源用户设备通过空口传输给目标用户设备，也可称之为邻近服务(Proximity Service，简称ProSe)。对于近距离通信的用户来说，D2D不但节省了无线频谱资源，而且降低了核心网的数据传输压力。
D2D的技术类型包括发现(discovery)和通信(communication)，其中discovery包括Type1和type 2两种类型，communication包括mode 1和mode 2两种类型。在第三代合作伙伴计划(3rd Generation Partnership Project，简称为3GPP)无线接入网工作组(Radio Access Network Work Group 1，简称为RAN1)讨论的长期演进(Long Term Evolution，简称为LTE)R12(Release12)阶段，communication的适用场景包括网络覆盖内、网络覆盖外、以及网络半覆盖场景。而对于discovery，只适用于覆盖内场景。
在LTE R12阶段，D2D发现只适用于覆盖内场景。对于网络覆盖内发现UE，基站通过RRC参数方式为发现UE配置资源参数，使得发现接收端UE与发送端UE的资源配置参数相同。如果要实现半覆盖场景和覆盖外场景的D2D发现，首先解决半覆盖场景和覆盖外场景的发现UE之间的定时同步，以及发送UE与接收UE之间发现资源池对齐的问题。
在R13阶段，3GPP技术规范组(Technology Standards Group，简称为TSG)提出在半覆盖场景和覆盖外场景应用Type 1 discovery的需求。对于半覆盖场景和覆盖外场景，目前，还 没有实现Type 1 discovery的同步和资源配置的方案。而对于communication，目前虽然支持半覆盖场景和覆盖外场景，但是对于半覆盖场景，标准会议也没有提出明确方案解决覆盖外UE如何获取覆盖内UE的资源池信息以实现与覆盖内UE的资源池对齐的问题。如果不解决上述问题，覆盖外发现UE与覆盖内发现UE无法实现相互发现，并且覆盖外UE发送的D2D发现信号还会对蜂窝通信业务形成干扰。目前在这个问题上还没有确定的方案。
针对相关技术中存在的无法实现半覆盖和覆盖外场景下的设备之间的D2D发现，目前尚未提出有效的解决方案。
发明内容
本发明提供了一种设备到设备D2D传输方法及装置，以至少解决相关技术中存在的无法实现半覆盖和覆盖外场景下的设备之间的D2D发现的问题。
根据本发明的一个方面，提供了一种设备到设备D2D传输方法，包括：设备搜索第一同步信号，根据搜索结果确定是否发送第二同步信号；所述设备在搜索所述第一同步信号的基础上确定用于D2D传输的资源；D2D信号和/或D2D数据在所述资源上传输。
可选地，所述设备搜索所述第一同步信号，根据搜索结果确定是否发送所述第二同步信号包括以下至少之一：如果搜索完一个扫描窗后没有搜索到所述第一同步信号，所述设备在下一个扫描窗内搜索所述第一同步信号；如果搜索完一个扫描窗后没有搜索到所述第一同步信号，所述设备作为独立同步源发送所述第二同步信号；如果完成对一个周期内的扫描窗的遍历搜索后没有搜索到所述第一同步信号，所述设备作为独立同步源发送所述第二同步信号。
可选地，所述一个周期的周期长度为D2D发现资源池周期的周期长度和/或D2D通信资源池周期的周期长度；所述遍历搜索包括以扫描窗为时间单位完成对所述一个周期的周期长度范围内所有时间段的搜索。
可选地，所述设备搜索所述第一同步信号，根据搜索结果确定是否发送所述第二同步信号包括，包括：所述设备在搜索到所述第一同步信号后选择同步源，并在扫描窗内搜索新的同步信号；如果搜索到新的同步信号，所述设备从选择的所述同步源和发送所述新的同步信号的设备中选择优先级高的设备作为新的同步源；所述设备发送所述第二同步信号，其中，发送所述第二同步信号的定时为所述新的同步源的定时。
可选地，所述扫描窗的长度为固定值或预配置的值；所述扫描窗的分布周期为固定值或预配置的值；所述设备每次的搜索范围为一个扫描窗的长度。
可选地，所述设备根据搜索结果确定是否发送所述第二同步信号包括：所述设备判断是否满足用于发送所述第二同步信号的发送条件，其中，所述发送条件包括：所述设备需要发送D2D信号和/或D2D数据且所述设备预先搜索到的所述第一同步信号的功率低于预设门限。
可选地，所述设备根据所述设备预先搜索到的所述第一同步信号发送所述第二同步信号包括：所述设备在不同于预先搜索到所述第一同步信号的同步资源的同步资源上发送所述第 二同步信号。
可选地，所述设备发送的所述第二同步信号与所述设备预先搜索到的所述第一同步信号的序列相同。
可选地，所述设备在根据所述设备预先搜索到的所述第一同步信号或所述设备已发送过的同步信号发送所述第二同步信号之后，还包括以下至少之一：所述设备在没有D2D信号和/或D2D数据要发送的D2D资源池周期中终止发送同步信号；所述设备在发送完一次同步信号后终止发送同步信号；所述设备在重新搜索到同步信号后终止发送同步信号；所述设备在预先搜索到的同步信号的定时超时后终止发送同步信号。
可选地，所述设备在D2D资源池周期内的每个D2D同步信号资源周期或D2D同步信号资源发送所述第二同步信号，所述D2D资源池用于发送D2D信号和/或D2D数据，所述D2D同步信号资源用于发送D2D同步信号，所述D2D同步信号：包括第二同步信号；或者，
所述设备在以下至少之一的资源或周期内发送所述第二同步信号：D2D资源池周期内的每个同步信号资源周期，D2D同步信号资源，D2D资源池周期起始位置之前的最近一个同步信号资源周期，同步信号资源，所述D2D资源池用于发送D2D信号和/或D2D数据，所述D2D同步信号资源用于发送D2D同步信号，所述D2D同步信号：包括第二同步信号。
可选地，还包括：D2D广播信道PSBCH的发送。
可选地，所述设备确定用于D2D传输的资源包括以下至少之一：所述设备根据指示消息确定所述资源，其中，所述指示消息承载于用于资源信息指示的物理信道中，或者，所述指示消息承载于所述D2D广播信道中，所述物理信道包括新定义物理信道；所述设备根据搜索的所述第一同步信号确定所述资源；所述设备根据搜索的所述第一同步信号和指示消息确定所述资源，其中，所述指示消息承载于用于资源信息指示的物理信道中，或者，所述指示消息承载于所述D2D广播信道中，所述物理信道包括新定义物理信道；所述设备根据预配置资源参数确定所述资源。
可选地，所述用于资源信息指示的所述物理信道的发送包括如下方式至少之一：所述物理信道的发送占用的资源为所述第一同步信号之后的第一个D2D子帧，其中，所述物理信道的发送周期大于或等于发送同步信号的周期；所述物理信道的发送占用的资源为预配置的资源，其中，所述预配置的资源具备预定周期和预定偏移，所述物理信道的发送优先级低于蜂窝信号和/或信道的发送优先级且高于D2D信号和/或D2D数据的发送优先级；所述物理信道的发送占用的时域资源为用于发送所述第一同步信号的同步资源的预定子帧，频域资源为中间预定数量的物理资源块PRB之外的PRB；所述物理信道的发送占用的时域资源为同步资源中没有发送所述第一同步信号的子帧，频域资源为中间预定数量的物理资源库PRB之外的PRB。
可选地，所述设备根据搜索的所述第一同步信号确定所述资源包括：所述设备根据搜索的所述第一同步信号的子帧的位置确定所述资源。
可选地，所述资源的起始位置位于搜索到的所述第一同步信号所在的子帧之后的预定偏移范围内。
可选地，所述设备根据搜索的所述第一同步信号和指示消息确定所述资源包括：所述设备在搜索到所述第一同步信号后，以搜索到的所述第一同步信号所在子帧为参考，结合所述指示消息的内容，确定所述资源。
根据本发明的另一方面，提供了一种设备到设备D2D传输装置，所述装置应用于设备中，包括：搜索模块，设置为搜索第一同步信号，根据搜索结果确定是否发送第二同步信号；确定模块，设置为在搜索所述第一同步信号的基础上确定用于D2D传输的资源；传输模块，设置为D2D信号和/或D2D数据在所述资源上传输。
可选地，所述搜索模块包括以下至少之一：如果搜索完一个扫描窗后没有搜索到所述第一同步信号，所述设备在下一个扫描窗内搜索所述第一同步信号；如果搜索完一个扫描窗后没有搜索到所述第一同步信号，所述设备作为独立同步源发送所述第二同步信号；如果完成对一个周期内的扫描窗的遍历搜索后没有搜索到所述第一同步信号，所述设备作为独立同步源发送所述第二同步信号。
可选地，所述一个周期的周期长度为D2D发现资源池周期的周期长度和/或D2D通信资源池周期的周期长度；所述遍历搜索包括以扫描窗为时间单位完成对所述一个周期的周期长度范围内所有时间段的搜索。
可选地，所述搜索模块包括：搜索单元，设置为在搜索到所述第一同步信号后选择同步源，并在扫描窗内搜索新的同步信号；选择单元，设置为如果搜索到新的同步信号，从选择的所述同步源和发送所述新的同步信号的设备中选择优先级高的设备作为新的同步源；发送单元，设置为发送所述第二同步信号，其中，发送所述第二同步信号的定时为所述新的同步源的定时。
可选地，所述扫描窗的长度为固定值或预配置的值；所述扫描窗的分布周期为固定值或预配置的值；所述设备每次的搜索范围为一个扫描窗的长度。
可选地，所述设备根据搜索结果确定是否发送所述第二同步信号包括：所述设备判断是否满足用于发送所述第二同步信号的发送条件，其中，所述发送条件包括：所述设备需要发送D2D信号和/或D2D数据且所述设备预先搜索到的所述第一同步信号的功率低于预设门限。
可选地，所述设备根据所述设备预先搜索到的所述第一同步信号发送所述第二同步信号包括：所述设备在不同于预先搜索到所述第一同步信号的同步资源的同步资源上发送所述第二同步信号。
可选地，所述设备发送的所述第二同步信号与所述设备预先搜索到的所述第一同步信号的序列相同。
可选地，所述设备在根据所述设备预先搜索到的所述第一同步信号或所述设备已发送过 的同步信号发送所述第二同步信号之后，所述装置还包括以下至少之一：所述设备在没有D2D信号和/或D2D数据要发送的D2D资源池周期中终止发送同步信号；所述设备在发送完一次同步信号后终止发送同步信号；所述设备在重新搜索到同步信号后终止发送同步信号；所述设备在预先搜索到的同步信号的定时超时后终止发送同步信号。
可选地，所述设备在D2D资源池周期内的每个D2D同步信号资源周期或D2D同步信号资源发送所述第二同步信号，所述D2D资源池用于发送D2D信号和/或D2D数据，所述D2D同步信号资源用于发送D2D同步信号，所述D2D同步信号：包括第二同步信号；或者，
所述设备在以下至少之一的资源或周期内发送所述第二同步信号：D2D资源池周期内的每个同步信号资源周期，D2D同步信号资源，D2D资源池周期起始位置之前的最近一个同步信号资源周期，同步信号资源，所述D2D资源池用于发送D2D信号和/或D2D数据，所述D2D同步信号资源用于发送D2D同步信号，所述D2D同步信号：包括第二同步信号。
可选地，所述装置还包括发送模块，设置为D2D广播信道PSBCH的发送。
可选地，所述确定模块包括以下至少之一：所述设备根据指示消息确定所述资源，其中，所述指示消息承载于用于资源信息指示的物理信道中，或者，所述指示消息承载于所述D2D广播信道中，所述物理信道包括新定义物理信道；所述设备根据搜索的所述第一同步信号确定所述资源；所述设备根据搜索的所述第一同步信号和指示消息确定所述资源，其中，所述指示消息承载于用于资源信息指示的物理信道中，或者，所述指示消息承载于所述D2D广播信道中，所述物理信道包括新定义物理信道；所述设备根据预配置资源参数确定所述资源。
可选地，所述用于资源信息指示的所述物理信道的发送包括如下方式至少之一：所述物理信道的发送占用的资源为所述第一同步信号之后的第一个D2D子帧，其中，所述物理信道的发送周期大于或等于发送同步信号的周期；所述物理信道的发送占用的资源为预配置的资源，其中，所述预配置的资源具备预定周期和预定偏移，所述物理信道的发送优先级低于蜂窝信号和/或信道的发送优先级且高于D2D信号和/或D2D数据的发送优先级；所述物理信道的发送占用的时域资源为用于发送所述第一同步信号的同步资源的预定子帧，频域资源为中间预定数量的物理资源块PRB之外的PRB；所述物理信道的发送占用的时域资源为同步资源中没有发送所述第一同步信号的子帧，频域资源为中间预定数量的物理资源库PRB之外的PRB。
可选地，所述设备根据搜索的所述第一同步信号确定所述资源包括：所述设备根据搜索的所述第一同步信号的子帧的位置确定所述资源。
可选地，所述资源的起始位置位于搜索到的所述第一同步信号所在的子帧之后的预定偏移范围内。
可选地，所述设备根据搜索的所述第一同步信号和指示消息确定所述资源包括：所述设备在搜索到所述第一同步信号后，以搜索到的所述第一同步信号所在子帧为参考，结合所述指示消息的内容，确定所述资源。
本发明另一实施例提供了一种计算机存储介质，所述计算机存储介质存储有执行指令，所述执行指令用于执行上述所述的方法。
通过本发明，设备搜索第一同步信号，根据搜索结果确定是否发送第二同步信号；所述设备在搜索所述第一同步信号的基础上确定用于D2D传输的资源；D2D信号和/或D2D数据在所述资源上传输。解决了相关技术中存在的无法实现半覆盖和覆盖外场景下的设备之间的D2D发现的问题，进而达到了实现设备之间的D2D发现的效果。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1是相关技术中的位于同一基站小区的UE的蜂窝通信示意图；
图2是相关技术中的位于同一基站小区的UE的D2D通信示意图；
图3是相关技术中的无线资源结构的示意图；
图4是相关技术中的蜂窝无线通信系统的网络部署示意图；
图5是根据本发明实施例的D2D传输方法的流程图；
图6是根据本发明实施例的D2D传输装置的结构框图；
图7是根据本发明实施例的D2D传输装置中同步模块62的结构框图；
图8是根据本发明实施例的D2D传输装置的优选结构框图；
图9是根据本发明实施例一的D2D同步信号扫描窗宽度和周期分布的示意图一；
图10是根据本发明实施例一的D2D同步信号扫描窗宽度和周期分布的示意图二；
图11是根据本发明实施例三的发送D2D同步信号的示意图一；
图12是根据本发明实施例三的发送D2D同步信号的示意图二；
图13是根据本发明实施例五的发送新定义的物理信道的示意图一；
图14是根据本发明实施例五的发送新定义的物理信道的示意图二；
图15是根据本发明实施例五的发送新定义的物理信道的示意图三。
具体实施方式
下文中将参考附图并结合实施例来详细说明本发明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
需要说明的是，本发明的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。
在LTE R12阶段，对于D2D discovery的讨论只针对覆盖内场景，没考虑覆盖外的discovery。R13阶段，对于半覆盖和覆盖外的discovery增强的WI已经在#66次全会上通过，确定R13阶段要扩展Type 1 discovery到半覆盖场景和覆盖外场景，作为公共安全网应用。
对于Type 1 discovery扩展到半覆盖场景和覆盖外场景，需要解决的问题主要是D2D UE的同步和对discovery资源池的确定。对于覆盖外场景，发现UE在部分方案上，比如D2D同步信号资源的配置和周期，以及资源池的预配置等方面，可以参考R12的结论。但是对于半覆盖场景，覆盖外的发现UE需要获得与覆盖内发现UE的定时同步，并且在与覆盖内发现资源池对齐的资源内发送/接收发现信号，才能与覆盖内发现UE实现相互发现，同时不对蜂窝通信形成干扰。可见，要实现Type 1 discovery的半覆盖场景和覆盖外场景扩展，还需要解决上述问题。
本发明实施例中针对上述问题，提出一种D2D发现方法，解决Type 1 discovery在半覆盖场景和覆盖外场景应用的同步和发现的问题。
本发明实施例中的技术方案可以适用于蜂窝无线通信系统或网络。常见的蜂窝无线通信系统可以基于码分多址(Code Division Multiplexing Access，简称为CDMA)技术、频分多址(Frequency Division Multiplexing Access，简称为FDMA)技术、正交频分多址(Orthogonal-FDMA，简称为OFDMA)技术、单载波频分多址(Single Carrier-FDMA，简称为SC-FDMA)技术，等。例如，3GPP LTE/高级长期演进(LTE-Advanced，简称为LTE-A)蜂窝通信系统下行链路(或称为前向链路)基于OFDMA技术，上行链路(或称为反向链路)基于SC-FDMA多址技术。未来则有可能在一个链路上支持混合的多址技术。
在OFDMA/SC-FDMA系统中，用于通信的无线资源(Radio Resource)是时-频两维的形式。例如，对于LTE/LTE-A系统来说，上行和下行链路的通信资源在时间方向上都是以无线帧(radio frame)为单位划分，每个无线帧(radio frame)长度为10ms，包含10个长度为1ms的子帧(sub-frame)，每个子帧包括长度为0.5ms的两个时隙(slot)，如图3所示，图3是相关技术中的无线资源结构的示意图。而根据循环前缀(Cyclic Prefix，CP)的配置不同，每个时隙可以包括6个或7个OFDM或SC-FDM符号。
在频率方向，资源以子载波(subcarrier)为单位划分，具体在通信中，频域资源分配的最小单位是资源块(Resource Block，简称为RB)，对应物理资源的一个物理资源块(Physical RB，简称为PRB)。一个PRB在频域包含12个子载波(sub-carrier)，对应于时域的一个时隙(slot)。每个OFDM/SC-FDM符号上对应一个子载波的资源称为资源单元(Resource Element，RE)。如图3所示。
在LTE/LTE-A蜂窝通信中，用户设备UE通过检测同步信号(Synchronization Signal，简称为SS)发现LTE网络。同步信号包括有主同步信号(Primary SS，简称为PSS)和辅同步信号(Secondary SS，简称为SSS)。通过检测同步信号，UE获得与基站的下行频率和时间同 步。并且，由于同步信号携带有物理小区标识，检测同步信号也意味着UE发现LTE/LTE-A小区。
在上行链路，当UE有上行数据传输时，需要发起随机接入(Random Access，简称为RA)进行上行同步并建立无线资源控制(Radio Resource Control，简称为RRC)连接，即从RRC空闲(Idle)状态进入RRC连接(Connected)状态。随机接入时UE需要发送随机接入前导(preamble)，网络侧通过在特定的时频资源中检测随机接入前导，实现对UE的识别和上行链路的同步。
图4是相关技术中的蜂窝无线通信系统的网络部署示意图。图4中所示可以是3GPP LTE/LTE-A系统，或者其它的蜂窝无线通信技术。在蜂窝无线通信系统的接入网中，网络设备一般包括一定数量的基站(Base Station，简称为BS，或者称为节点B，简称为Node B，或者演进的节点B，evolved Node B，简称为eNB，或者增强的节点B，enhanced Node B，简称为eNB)，以及其它的网络实体(network entity)或网络单元(network element)。或者，概括来说，在3GPP中也可以将其统称为网络侧演进的通用陆地无线接入网络(Evolved Universal Terrestrial Radio Access Network，简称为E-UTRAN)。这里所说的基站也包括网络中的低功率节点(Low Power Node，简称为LPN)，例如毫微微小区或家庭基站(pico，Relay，femto，HeNB即Home eNB等)。为描述简单，图4只示意出了3个基站。基站提供一定的无线信号覆盖范围，在该覆盖范围内的终端(terminal，或者称为用户设备，User Equipment，简称为UE，或者device)可以与该基站进行无线通信。一个基站的无线信号覆盖区域可能会基于某些准则被划分为一个或者多个小区cell或扇区sector，例如可能会是三个小区。
在D2D通信时，也存在类似的发送端UE与接收端UE之间的同步，即发送端UE与接收端UE参照相同的定时参考，完成对D2D信号/数据的发送和接收。同时，接收端UE需要与发送端UE基于相同的D2D资源配置参数，否则不能正确地完成D2D信号/数据的接收。
在LTE R12阶段，D2D发现只适用于覆盖内场景。对于网络覆盖内发现UE，基站通过RRC参数方式为发现UE配置资源参数，使得发现接收端UE与发送端UE的资源配置参数相同。在LTE R13阶段，如果要实现半覆盖场景和覆盖外场景的D2D发现，首先解决半覆盖场景和覆盖外场景的发现UE之间的定时同步，以及发送UE与接收UE之间发现资源池对齐的问题。这些问题在现有技术中没有解决方案，本发明提供了一种D2D发现方法，解决LTE R13阶段Type 1发现的同步和发现资源池确定问题。
针对上述问题，在发明本实施例中提供了一种设备到设备D2D传输方法，图5是根据本发明实施例的D2D传输方法的流程图，如图5所示，该流程包括如下步骤：
步骤S502，设备搜索第一同步信号，根据搜索结果确定是否发送第二同步信号；
步骤S504，该设备在搜索第一同步信号的基础上确定用于D2D传输的资源；
步骤S506，D2D信号和/或D2D数据在资源上传输。
通过上述步骤，设备通过搜索同步信号以及发送同步信号的方式进行D2D同步，并且， 设备在确定用于D2D传输的资源后，D2D信号和/或D2D数据可以在确定的资源上传输，其中，该D2D信号和/或D2D数据的传输可以是接收D2D信号和/或D2D数据也可以是发送D2D信号和/或D2D数据，从而有效的实现半覆盖场景和覆盖外场景下设备之间的定时同步，以及设备之间发现资源池对齐的问题，实现了设备之间的D2D发现，解决相关技术中存在的无法实现半覆盖和覆盖外场景下的设备之间的D2D发现的问题，进而达到了实现设备之间的D2D发现的效果。
其中，上述设备搜索第一同步信号，根据搜索结果确定是否发送第二同步信号可以包括以下至少之一：如果搜索完一个扫描窗后没有搜索到第一同步信号，该设备在下一个扫描窗内搜索第一同步信号；如果搜索完一个扫描窗后没有搜索到第一同步信号，该设备作为独立同步源发送第二同步信号；如果完成对一个周期内的扫描窗的遍历搜索后没有搜索到第一同步信号，该设备作为独立同步源发送第二同步信号。
在一个可选的实施例中，上述的一个周期的周期长度可以为D2D发现资源池周期的周期长度和/或D2D通信资源池周期的周期长度；上述的遍历搜索包括以扫描窗为时间单位完成对一个周期的周期长度范围内所有时间段的搜索。
在一个可选的实施例中，上述的设备搜索第一同步信号，根据搜索结果确定是否发送第二同步信号可以包括：上述设备在搜索到第一同步信号后选择同步源，并在扫描窗内搜索新的同步信号；如果搜索到新的同步信号，该设备从选中的同步源和发送该新的同步信号的设备中选择优先级高的设备作为新的同步源；该设备发送第二同步信号，其中，发送第二同步信号的定时为新的同步源的定时。
上述的扫描窗的长度可以为固定值或预配置的值；上述扫描窗的分布周期为固定值或预配置的值；上述的设备每次的搜索范围为一个扫描窗的长度。
在一个可选的实施例中，上述设备根据搜索结果确定是否发送第二同步信号包括：上述设备判断是否满足用于发送第二同步信号的发送条件，其中，该发送条件包括：设备需要发送D2D信号和/或D2D数据且该设备预先搜索到的第一同步信号的功率低于预设门限、该设备搜索到两个以上不同优先级的同步信号；在判断结果为是的情况下，该设备根据该设备预先搜索到的第一同步信号或该设备已发送过的同步信号发送第二同步信号，其中，该设备在发送第二同步信号时是在D2D资源池周期内的每个D2D同步信号资源周期或D2D同步信号资源进行发送的，该D2D资源池用于发送D2D信号和/或D2D数据，该同步信号资源用于发送同步信号；或者，在上述判断结果为是的情况下，该设备发送第二同步信号，其中，该设备在发送第二同步信号时是在D2D资源池周期内的每个同步信号资源周期和/或D2D同步信号资源和/或D2D资源池周期起始位置之前的最近一个同步信号资源周期或同步信号资源进行发送的，该D2D资源池用于发送D2D信号和/或D2D数据，该同步信号资源用于发送同步信号。
其中，上述设备根据该设备预先搜索到的第一同步信号发送第二同步信号包括：该设备在不同于预先搜索到第一同步信号的D2D同步资源的D2D同步资源上发送第二同步信号。
在一个可选的实施例中，上述的设备发送的第二同步信号与该设备预先搜索到的第一同步信号的序列相同。
在一个可选的实施例中，上述设备在根据该设备预先搜索到的第一同步信号或该设备已发送过的同步信号发送第二同步信号之后，还包括以下至少之一：该设备在没有D2D信号和/或D2D数据要发送的D2D资源池周期中终止发送同步信号；该设备在发送完一次同步信号后终止发送同步信号；该设备在重新搜索到同步信号后终止发送同步信号；该设备在预先搜索到的同步信号的定时超时后终止发送同步信号。
在一个可选的实施例中，还包括：D2D广播信道(Physical Sidelink Broadcast Channel，简称为PSBCH)的发送。其中，该D2D广播信道的发送可以是由上述设备发送的。
上述的设备确定用于D2D传输的资源包括以下至少之一：该设备根据指示消息确定资源，其中，该指示消息承载于用于资源信息指示的物理信道中，或者，该指示消息承载于预先发送的D2D广播信道PSBCH中，物理信道包括新定义物理信道；该设备根据搜索的第一同步信号确定资源；该设备根据搜索的第一同步信号和指示消息确定资源，其中，该指示消息承载于用于资源信息指示的物理信道中，或者，该指示消息承载于预先发送的D2D广播信道PSBCH中，该物理信道包括新定义物理信道；该设备根据预配置资源参数确定资源。
在一个可选的实施例中，上述的用于资源信息指示的物理信道的发送包括如下方式至少之一：上述物理信道的发送占用的资源为第一同步信号之后的第一个D2D子帧，其中，该物理信道的发送周期大于或等于发送同步信号的周期；该物理信道的发送占用的资源为预配置的资源上，其中，该预配置的资源具备预定周期和预定偏移，物理信道的发送优先级低于蜂窝信号和/或信道的发送优先级且高于D2D信号和/或D2D数据的发送优先级；该物理信道的发送占用的时域资源为用于发送第一同步信号的同步资源的预定子帧，频域资源为中间预定数量的物理资源块PRB之外的PRB；该物理信道的发送占用的时域资源为同步资源中没有发送第一同步信号的子帧，频域资源为中间预定数量的物理资源库PRB之外的PRB。
上述设备根据搜索的第一同步信号确定资源包括：该设备根据搜索的第一同步信号的子帧的位置确定资源。
在一个可选的实施例中，上述资源的起始位置位于搜索到的第一同步信号所在的子帧之后的预定偏移范围内。
上述的设备根据搜索的第一同步信号和指示消息确定资源包括：上述设备在搜索到第一同步信号后，以搜索到的第一同步信号所在子帧为参考，结合指示消息的内容，确定上述资源。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到根据上述实施例的方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如 ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端设备(可以是手机，计算机，服务器，或者网络设备等)执行本发明各个实施例的方法。
在本实施例中还提供了一种设备到设备D2D传输装置，该装置用于实现上述实施例及优选实施方式，已经进行过说明的不再赘述。如以下所使用的，术语“模块”可以实现预定功能的软件和/或硬件的组合。尽管以下实施例所描述的装置较佳地以软件来实现，但是硬件，或者软件和硬件的组合的实现也是可能并被构想的。
图6是根据本发明实施例的D2D传输装置的结构框图，如图6所示，该装置应用于设备中，包括搜索模块62、确定模块64和传输模块66，下面对该装置进行说明。
搜索模块62，设置为搜索第一同步信号，根据搜索结果确定是否发送第二同步信号；确定模块64，连接至上述搜索模块62，设置为在搜索第一同步信号的基础上确定用于D2D传输的资源；传输模块66，连接至上述确定模块64，设置为D2D信号和/或D2D数据在上述资源上传输。
其中，上述搜索模块62包括以下至少之一：如果搜索完一个扫描窗后没有搜索到第一同步信号，该设备在下一个扫描窗内搜索第一同步信号；如果搜索完一个扫描窗后没有搜索到第一同步信号，该设备作为独立同步源发送第二同步信号；如果完成对一个周期内的扫描窗的遍历搜索后没有搜索到第一同步信号时，该设备作为独立同步源发送第二同步信号。
其中，上述的一个周期的周期长度为D2D发现资源池周期的周期长度和/或D2D通信资源池周期的周期长度；遍历搜索包括以扫描窗为时间单位完成对一个周期的周期长度范围内所有时间段的搜索。图7是根据本发明实施例的D2D传输装置中搜索模块62的结构框图，如图7所示，该搜索模块62包括搜索单元72、选择单元74和发送单元76，下面对该装置进行说明。
搜索单元72，设置为在搜索到第一同步信号后选择同步源，并在扫描窗内搜索新的同步信号；选择单元74，连接至上述搜索单元72，设置为如果搜索到新的同步信号，从选择的同步源和发送新的同步信号的设备中优先级高的设备作为新的同步源；发送单元76，连接至上述选择单元74，设置为发送第二同步信号，其中，发送该第二同步信号的定时为新的同步源的定时。
在一个可选的实施例中，上述的扫描窗的长度为固定值或预配置的值；上述的扫描窗的分布周期为固定值或预配置的值；上述的设备每次的搜索范围为一个扫描窗的长度。
在一个可选的实施例中，上述设备根据搜索结果确定是否发送第二同步信号包括：该设备判断是否满足用于发送第二同步信号的发送条件，其中，该发送条件包括以下至少之一：该设备需要发送D2D信号和/或D2D数据且该设备预先搜索到的第一同步信号的功率低于预设门限、该设备搜索到两个以上不同优先级的同步信号；在判断结果为是的情况下，该设备根据该设备预先搜索到的第一同步信号或该设备已发送过的同步信号发送第二同步信号，其中，该设备在发送第二同步信号时是在D2D资源池周期内的每个D2D同步信号资源周期或 D2D同步信号资源进行发送的，该D2D资源池用于发送D2D信号和/或D2D数据，该同步信号资源用于发送同步信号；或者，在判断结果为是的情况下，该设备发送第二同步信号，其中，该设备在发送第二同步信号时是在D2D资源池周期内的每个同步信号资源周期和/或D2D同步信号资源和/或D2D资源池周期起始位置之前的最近一个同步信号资源周期或同步信号资源进行发送的，该D2D资源池用于发送D2D信号和/或D2D数据，该同步信号资源用于发送同步信号。
上述的设备根据该设备预先搜索到的第一同步信号发送第二同步信号包括：该设备在不同于预先搜索到第一同步信号的同步资源上发送第二同步信号。
上述的设备发送的第二同步信号与该设备预先搜索到的第一同步信号的序列相同。
在一个可选的实施例中，上述设备在根据该设备预先搜索到的第一同步信号或该设备已发送过的同步信号发送第二同步信号之后，该装置还包括以下至少之一：该设备在没有D2D信号和/或D2D数据要发送的D2D资源池周期中终止发送D2D同步信号；该设备在发送完一次同步信号后终止发送同步信号；该设备在重新搜索到同步信号后终止发送同步信号；该设备在预先搜索到的同步信号的定时超时后终止发送同步信号。
图8是根据本发明实施例的D2D传输装置的优选结构框图，如图8所示，该装置除包括图6所示的所有模块外，还包括发送模块82，该发送模块82和图6中的各模块的位置关系可以有多种，下面以先发送D2D广播信道再确定资源为了进行说明。
发送模块82，连接至上述确定模块64，设置为D2D广播信道的PSBCH的发送。
在一个可选的实施例中，上述的确定模块64包括以下至少之一：根据指示消息确定资源，其中，该指示消息承载于用于资源信息指示的物理信道中，或者，该指示消息承载于预先发送的D2D广播信道PSBCH中，物理信道包括新定义物理信道；根据搜索的第一同步信号确定资源；根据搜索的第一同步信号和指示消息确定上述资源，其中，该指示消息承载于用于资源信息指示的物理信道中，或者，该指示消息承载于预先发送的D2D广播信道PSBCH中，该物理信道包括新定义物理信道；根据预配置资源参数确定资源。
上述的用于资源信息指示的物理信道的发送包括如下方式至少之一：物理信道的发送占用的资源为第一同步信号之后的第一个D2D子帧，其中，该物理信道的发送周期大于或等于发送D2D同步信号的周期；该物理信道的发送占用的资源为预配置的资源，其中，该预配置的资源具备预定周期和预定偏移，物理信道的发送优先级低于蜂窝信号和/或信道的发送优先级且高于D2D信号和/或D2D数据的发送优先级；该物理信道的发送占用的时域资源为用于发送第一同步信号的同步资源的预定子帧，频域资源为中间预定数量的物理资源块PRB之外的PRB；该物理信道的发送占用的时域资源为同步资源中没有发送第一同步信号的子帧，频域资源为中间预定数量的物理资源库PRB之外的PRB。
其中，该设备根据搜索的第一同步信号确定资源包括：该设备根据搜索的第一同步信号的子帧的位置确定资源。
上述资源的的起始位置位于搜索到的第一同步信号所在的子帧之后的预定偏移范围内。
在一个可选的实施例中，上述的设备根据搜索的第一同步信号和指示消息确定上述资源包括：该设备在搜索到第一同步信号后，以搜索到的第一同步信号所在子帧为参考，结合指示消息的内容，确定上述资源。
需要说明的是，上述各个模块是可以通过软件或硬件来实现的，对于后者，可以通过以下方式实现，但不限于此：上述模块均位于同一处理器中；或者，上述模块分别位于多个处理器中。
本发明的实施例还提供了一种存储介质。可选地，在本实施例中，上述存储介质可以被设置为存储用于执行以下步骤的程序代码：
S1，设备搜索第一同步信号，根据搜索结果确定是否发送第二同步信号；
S2，该设备在搜索第一同步信号的基础上确定用于D2D传输的资源；
S3，D2D信号和/或D2D数据在上述资源上传输。
可选地，在本实施例中，上述存储介质可以包括但不限于：U盘、只读存储器(Read-Only Memory，简称为ROM)、随机存取存储器(Random Access Memory，简称为RAM)、移动硬盘、磁碟或者光盘等各种可以存储程序代码的介质。
下面结合具体实施例对本发明进行说明：
实施例一
覆盖外D2D UE(同上述的设备)在当前没有获得同步源的情况下，可以通过持续扫描D2D同步信号所在的频域来搜索D2D同步信号，以获得D2D同步源。在覆盖外场景，D2D UE获得的同步源为D2D UE。在半覆盖场景，覆盖外UE优先同步到覆盖内的同步源，包括发现UE和/或通信UE。
一种情况，如果覆盖内只有LTE R12阶段的发现UE，那么覆盖内发现UE在一个发现资源池周期内最多发送一次D2D同步信号，这种情况下，覆盖外发现UE通过持续扫描来搜索D2D同步信号的话，搜索的时间会比较长。因此，覆盖外发现UE还可以通过按扫描窗扫描的方式来搜索D2D同步信号。比如，设置扫描窗和扫描窗分布的周期，覆盖外发现UE根据扫描窗分布周期在扫描窗范围内扫描搜索D2D同步信号，每次扫描搜索的范围为一个扫描窗长度，扫描窗的长度和分布周期可以设置为固定值或预配置，例如，扫描窗的长度可以设置为40ms、80ms、100ms、120ms、160ms、320ms等，扫描窗的分布周期可以设置为40ms、80ms、160ms、320ms、640ms、1280ms、2560ms、5120ms、10240ms等。
图9是根据本发明实施例一的D2D同步信号扫描窗宽度和周期分布的示意图一，图10是根据本发明实施例一的D2D同步信号扫描窗宽度和周期分布的示意图二，图9和图10所示 为扫描窗长度和分布周期设置的两个例子，图9中，扫描窗长度为40ms，扫描窗的分布周期为(10240+40)ms。图10中，扫描窗长度为40ms，扫描窗的分布周期为80ms。在相邻的两个10240ms周期长度之间，扫描窗相对10240ms周期的起始位置的偏移相差正或负40ms。
对于覆盖外发现UE通过按扫描窗扫描的方式来搜索D2D同步信号，一种方案是覆盖外发现UE依次按扫描窗进行扫描，直到搜索到D2D同步信号。如果完成了对发现资源池周期长度的遍历搜索，还没有搜索到D2D同步信号，则覆盖外发现UE作为独立同步源在有D2D发现信号要发送的D2D发现资源池周期中发送D2D同步信号，或发送D2D同步信号和D2D广播信道(Physical Sidelink Broadcast Channel,简称为PSBCH)，上述的有D2D发现信号要发送的D2D发现资源池周期结束后，则停止发送D2D同步信号，或停止发送D2D同步信号和D2D广播信道(Physical Sidelink Broadcast Channel,简称为PSBCH)，并重新判断是否发送D2D同步信号。这里说的完成了对发现资源池周期长度的遍历搜索，也就是说扫描窗覆盖了发现资源池周期长度范围内的所有时域段。比如，针对10240ms的发现资源池周期，如果按40ms的扫描窗宽度，(10240+40)ms的扫描窗分布周期，那么，经过256次扫描之后，扫描窗已经覆盖了发现资源池周期(10240ms)中的所有时域范围，即完成了对10240ms长度中所有时域范围的搜索。
或者，对于覆盖外D2D UE通过按扫描窗扫描的方式来搜索D2D同步信号，覆盖外D2D UE扫描完一个扫描窗以后，如果没有搜索到D2D同步信号，则作为独立同步源在有D2D发现信号要发送的D2D发现资源池周期中发送D2D同步信号，或发送D2D同步信号和D2D广播信道(Physical Sidelink Broadcast Channel,简称为PSBCH)，上述的有D2D发现信号要发送的D2D发现资源池周期结束后，则停止发送D2D同步信号，或停止发送D2D同步信号和D2D广播信道(Physical Sidelink Broadcast Channel,简称为PSBCH)，并重新判断是否发送D2D同步信号。例如，设置扫描窗长度为40ms，扫描窗的分布周期为(320+40)ms，如果发现UE扫描一个扫描窗长度40ms后，没有搜索到D2D同步信号，则该发现UE作为独立同步源发送D2D同步信号，或发送D2D同步信号和D2D广播信道(PSBCH)。
实施例二
覆盖外D2D UE在已获得同步源的情况下，则基于已获得同步源的定时参考在扫描窗内所搜新的D2D同步信号，如果搜索到新的D2D同步信号，则该D2D UE根据同步源优先级准则，重新选择同步源。
扫描窗的长度和分布周期为固定值或预配置，扫描窗的宽度可以设为40ms、60ms、80ms、100ms、120ms、160ms等，扫描窗的分布周期可以设为40ms、80ms、160ms、320ms、640ms、1280ms、2560ms、5120ms、10240ms等。
在搜索新的D2D同步信号的扫描窗内的时域资源，D2D UE不发送D2D同步信号和/或信道与D2D信号和/或数据。
在D2D UE重新选择D2D同步源所遵循的同步源优先级准则中，覆盖内同步源UE的优 先级高于覆盖外同步源UE。同为覆盖内同步源UE或同为覆盖外同步源UE的情况下，检测到的接收功率高的D2D同步信号所对应的同步源UE的优先级更高。这里的同步源UE为发现UE和/或通信UE。
如果搜索到的新D2D同步信号所对应的同步源的优先级高于发现UE当前已获得的同步源，则D2D UE根据优先级准则，同步到优先级高的同步源。例如，如果发现UE在某一个发现资源池周期范围内搜索到优先级高的同步源，发现UE会完成当前发现资源池周期内的发现信号的发送和接收，在当前发现资源池周期结束之后停止基于当前同步源发送的D2D同步信号，或停止发送D2D同步信号和D2D广播信道(Physical Sidelink Broadcast Channel,简称为PSBCH)，并切换到新的同步源。
并列地，如果覆盖外发现UE(R13 的发现UE)移动到覆盖内，则发现UE优先通过蜂窝系统的下行同步信号同步到基站。
实施例三
对于覆盖外发现UE，周期地设置D2D同步资源周期，比如为40ms、80ms或者160ms，每个D2D同步资源周期配置1个D2D同步资源，也可以配置多个D2D同步资源，比如2个或3个。如果每个D2D同步资源周期配置1个D2D同步资源，则D2D同步资源的偏移与R12覆盖内UE的D2D同步资源的偏移相同，这里说的D2D同步资源的偏移为SFN(System Frame Number)或DFN(Direct Frame Number)循环内第一个D2D同步资源周期内D2D同步资源相对SFN#0或DFN#0的偏移量，以1个子帧为粒度。如果每个D2D同步资源周期配置2个D2D同步资源，则D2D同步资源周期内第一个D2D同步资源的偏移与R12覆盖内UE的D2D同步资源的偏移相同。
覆盖外发现UE发送D2D同步资源的周期为每个发现资源周期内最多发送一次D2D同步信号。如果每个D2D同步资源周期内配置的D2D同步资源超过1个，则任意选择一个D2D同步资源发送D2D同步信号，或固定在其中一个D2D同步资源发送，比如第1个D2D同步资源。
或者，覆盖外发现UE发送D2D同步资源的周期为N个D2D同步资源周期发送一次D2D同步信号，N可以为正整数。例如：覆盖外发现UE在每个D2D同步周期发送一次D2D同步信号，即N＝1。如果每个D2D同步资源周期配置2个D2D同步资源，则可以选择在D2D同步资源周期内的第一个D2D同步资源发送D2D同步信号，也可以选择在D2D同步资源周期内的第二个D2D同步资源发送D2D同步信号。又例如：覆盖外发现UE在两个D2D同步周期发送一次D2D同步信号，即N＝2。UE发送D2D同步信号后，空一个D2D同步资源周期，再发送D2D同步信号。可以选择在D2D同步资源周期内的第一个D2D同步资源发送D2D同步信号，也可以选择在D2D同步资源周期内的第二个D2D同步资源发送D2D同步信号。在发送上述D2D同步信号的D2D同步资源所在的D2D发现资源池周期结束后，则停止发送D2D同步信号，并重新判断是否发送D2D同步信号。上述描述的发送D2D同步信号还包括同时发 送D2D广播信道(PSBCH)。
或者，覆盖外发现UE根据检测到的D2D同步信号来发送D2D同步信号，有以下几种可选的方式：
方式1：如果覆盖外发现UE能够在D2D同步资源检测到D2D同步信号，则该发现UE在检测到D2D同步信号的D2D同步资源的下一个D2D同步资源或D2D同步资源周期发送D2D同步信号，或者发送D2D同步信号和D2D广播信道(Physical Sidelink Broadcast Channel,简称为PSBCH)，发送一次后停止发送D2D同步信号，或者停止发送D2D同步信号和D2D广播信道(Physical Sidelink Broadcast Channel,简称为PSBCH)，并重新检测D2D同步信号。发送D2D同步信号基于检测到的D2D同步信号的定时参考，发送的D2D同步信号的序列与检测到的D2D同步信号的序列相同。如果覆盖外发现UE在D2D同步资源没有检测到D2D同步信号，则发现UE在没有检测到D2D同步信号的D2D同步资源的下一个或M个D2D同步资源或D2D同步资源周期不发送D2D同步信号，也不发送D2D广播信道(PSBCH)，M可以为正整数，或者在当前发现资源池周期内没有检测到D2D同步信号的D2D同步资源之后的所有D2D同步资源不发送D2D同步信号，也不发送D2D广播信道(PSBCH)。
一个方式1的例子如图11所示，图11是根据本发明实施例三的发送D2D同步信号的示意图一，D2D同步资源周期为40ms，覆盖外发现UE如果在D2D同步资源周期中的D2D同步资源检测到D2D同步信号，则在下一个D2D同步资源发送D2D同步信号，发送的D2D同步信号与检测到的D2D同步信号序列相同；如果没有检测到D2D同步信号，则在下一个D2D同步资源不发送D2D同步信号。图11中示例的一个D2D同步资源周期中配置2个D2D同步资源的情况，也可以是一个D2D同步资源周期中配置1个D2D同步资源，检测D2D同步信号和发送D2D同步信号的D2D同步资源分别在不同D2D同步资源周期。本例子描述中发送D2D同步信号包括发送D2D同步信号，或者发送D2D同步信号和D2D广播信道(PSBCH)。
方式2，如果覆盖外发现UE能够在D2D同步资源检测到D2D同步信号，则发现UE在检测到D2D同步信号的D2D同步资源的下一个D2D同步资源或D2D同步资源周期发送D2D同步信号，或者发送D2D同步信号和D2D同步信道，发送一次后停止发送D2D同步信号，或停止发送D2D同步信号和D2D广播信道(Physical Sidelink Broadcast Channel,简称为PSBCH)，并重新检测D2D同步信号。发送D2D同步信号基于检测到的D2D同步信号的定时参考，发送的D2D同步信号的序列与检测到的D2D同步信号的序列相同。如果覆盖外发现UE在D2D同步资源没有检测到D2D同步信号，则发现UE在没有检测到D2D同步信号的D2D同步资源所在的D2D同步资源周期以及下一个或M个D2D同步资源周期重复发送在没有检测到D2D同步信号的D2D同步资源之前发送过的D2D同步信号，或发送D2D同步信号和D2D广播信道(Physical Sidelink Broadcast Channel,简称为PSBCH)，或者发现UE在没有检测到D2D同步信号的D2D同步资源的下一个或M个D2D同步资源重复发送在没有检测到D2D同步信号的D2D同步资源之前发送过的D2D同步信号，或发送D2D同步信号和D2D广播信道(Physical Sidelink Broadcast Channel,简称为PSBCH)，M为正整数，这里的之前发送过的D2D同步信号可能是在没有检测到D2D同步信号的D2D同步资源之前最近 一次检测到的D2D同步信号，也可能是在没有检测到D2D同步信号的D2D同步资源之前重复发送的D2D同步信号。或者，在没有检测到D2D同步信号的D2D同步资源之前发送过的D2D同步信号的定时超时后终止发送D2D同步信号。
一个方式2的例子如图12所示，图12是根据本发明实施例三的发送D2D同步信号的示意图二，D2D同步资源周期为40ms，覆盖外发现UE如果在D2D同步资源周期中的D2D同步资源检测到D2D同步信号，则在下一个D2D同步资源发送D2D同步信号，发送的D2D同步信号与检测到的D2D同步信号序列相同；如果没有检测到D2D同步信号，则在下一个D2D同步资源重复发送上一次发送的D2D同步信号。这样，在覆盖外UE有发现信号要发送的发现资源池周期内，每个D2D同步资源周期都发送一次D2D同步信号。本例子描述中发送D2D同步信号包括发送D2D同步信号，或者发送D2D同步信号和D2D广播信道(PSBCH)。
或者，当覆盖外发现UE移动到覆盖内，则发现UE在有发现信号发送的发现资源池周期对应的每个D2D同步资源周期都发送一次D2D同步信号。
实施例四
一种D2D同步信号的发送方法，在有D2D信号要发送的D2D资源池周期内，D2D UE在每一个D2D同步信号资源周期或D2D同步信号资源都发送D2D同步信号。例如：在网络覆盖内的发现UE确定D2D同步信号资源与D2D发现资源池周期中的第一个D2D子帧重合了，则该发现UE在D2D发现资源池周期中的第一个D2D子帧发送D2D同步信号，同时，还在D2D发现资源池周期中的其它所有的D2D同步信号资源周期都发送D2D同步信号。
或者，在有D2D信号要发送的D2D资源池周期内，D2D UE在每一个D2D同步信号资源周期或D2D同步信号资源都发送D2D同步信号，并且，在有D2D信号要发送的D2D资源池周期起始位置之前最近的D2D同步信号资源周期或D2D同步信号资源也发送D2D同步信号。例如：在网络覆盖内的发现UE确定D2D发现资源池周期中的第一个D2D子帧不是D2D同步信号资源，则该发现UE在D2D资源池周期起始位置之前最近的D2D同步信号资源发送D2D同步信号，并且，在D2D资源池周期中所有的D2D同步信号资源周期或D2D同步资源都发送D2D同步信号。
实施例五
D2D UE之间要实现相互发现或通信，需要确定用于D2D传输的资源，这里的用于D2D传输的资源也可以称为D2D资源池，D2D资源池包括D2D发现资源池或D2D通信资源池，D2D UE在D2D资源池内的D2D子帧发送和/或接收D2D信号和/或数据。可以根据以下几种可选方式确定D2D资源池。
方式1：通过指示消息来确定D2D资源池，指示消息中携带D2D资源池配置参数，指示消息通过新定义的物理信道来承载。
新定义的物理信道可以伴随D2D同步信号发送。比如，发现信号的发送端UE在发送D2D 同步信号之后的第一个D2D子帧发送新定义物理信道，发送周期与D2D同步信号相同或者大于D2D同步信号的发送周期。图13是根据本发明实施例五的发送新定义的物理信道的示意图一，图13中发现UE在D2D同步资源1300、1302、1304上发送了D2D同步信号，则在D2D子帧1301、1303、1305发送新定义的物理信道，承载发现资源池的指示消息。
或者，新定义的物理信道可以按确定的周期和偏移发送。比如，发现信号的发送端UE在确定的周期和偏移所对应的子帧发送新定义物理信道，这里的确定的周期和偏移值可以是固定的或预配置，其中偏移值的粒度为1个子帧。新定义物理信道发送优先级低于蜂窝信号和信道，高于D2D信号和数据，也就是说，当对应发送新定义物理信道的子帧被调度用于发送蜂窝数据时，则在该子帧放弃发送新定义物理信道。或者，新定义物理信道的发送优先级低于蜂窝信号和信道，以及D2D信号和数据。图14是根据本发明实施例五的发送新定义的物理信道的示意图二，图14中是按确定周期和偏移发送新定义物理信道的一个示例，图14中发现UE在子帧1400、1401、1402上发送新定义的物理信道。发送新定义物理信道的周期为40ms的N(正整数)倍，相对D2D同步资源子帧的偏移为K个子帧，K可以为正整数。
或者，新定义的物理信道可以在D2D同步资源子帧发送。比如，发现信号的发送端UE在没有发送D2D同步信号的同步资源的子帧发送新定义物理信道，时域资源选择不发送D2D同步信号的D2D同步资源所在的子帧，频域资源选择中间6个PRB之外的PRB(该实施例中，中间6为优选的实施例，也可以选择中间其他预定数量的PRB之外的PRB)。图15是根据本发明实施例五的发送新定义的物理信道的示意图三，图15所示为在D2D同步资源子帧发送新定义物理信道的一个示例，图15中发现UE在D2D同步资源子帧900和903发送了D2D同步信号，在D2D同步资源子帧901、902和904没有发送D2D同步信号，而是发送新定义的物理信道，频域资源为中间6个PRB之外的部分(也可以选择中间其他预定数量的PRB之外的部分)。图15示例中选择了所有没有发送D2D同步信号的D2D同步资源的子帧发送新定义物理信道，也可以从中选择部分D2D同步子帧发送，比如选择在发送了D2D同步信号的D2D同步子帧后的第一个D2D同步子帧。又或者，发现信号的发送端UE在发送D2D同步信号的同步资源的子帧发送新定义物理信道，时域资源选择发送了D2D同步信号的D2D同步信号资源所在的子帧或者发现资源池周期内第一个发送D2D同步信号的D2D同步信号资源所在子帧来发送新定义物理信道。频域资源选择中间6个PRB之外的PRB(也可以选择中间其他预定数量的PRB之外的PRB)。
方式2：通过对D2D同步信号或/和同步信道的检测确定D2D资源池。
发现UE通过检测D2D同步信号后，可以确定D2D同步信号所在的子帧，D2D同步资源周期为40ms，R12的发现UE发送D2D同步信号的子帧与发现资源池的偏移也小于40ms，因此，可以确定发现资源池的起始子帧在D2D同步信号的子帧之后40ms的范围内，从D2D同步信号的子帧往后，就是发现资源池的时域范围。发现UE在确定D2D同步信号子帧后，可以开始监听发现信号，在40ms内有可能监听到发现信号。
方式3：通过对D2D同步信号或/和同步信道的检测与通过指示消息相结合确定D2D资源池。
与方式2类似，发现UE通过检测D2D同步信号后，可以确定D2D同步信号所在的子帧，D2D同步资源周期为40ms，R12的发现UE发送D2D同步信号的子帧与发现资源池的偏移也小于40ms，因此，发现UE可以结合指示消息，根据指示消息指示的参数内容在确定D2D同步信号子帧后的40ms内确定发现资源池的起始位置。
方式4：通过预配置资源池参数确定D2D资源池。
UE通过设备预配置的方式，根据预配置的参数确定D2D发现资源池。设备预配置的参数可以保持与覆盖内配置的资源池参数一致，覆盖内发现UE配置参数值保持为可选参数值中的某一个值，比如发现资源池周期固定配置为320ms，640ms，1280ms，2560ms，5120ms或10240ms中的一个，覆盖外发现UE的发现资源池周期预配置为对应的其中一个值。
以上只是对覆盖外UE的发现资源池周期的预配置进行举例说明，其它发现资源池参数的预配置类似。同时，以上实施例描述中发送D2D同步信号包括发送D2D同步信号，或者发送D2D同步信号和D2D广播信道(PSBCH)。
以上实施例只是以D2D发现举例说明，但并不限定本发明的方法只限于D2D发现。
本发明的实施例还提供了一种存储介质。可选地，在本实施例中，上述存储介质中存储有执行指令，该执行指令用于执行上述的方法。
可选地，在本实施例中，上述存储介质可以包括但不限于：U盘、只读存储器(Read-Only Memory，简称为ROM)、随机存取存储器(Random Access Memory，简称为RAM)、移动硬盘、磁碟或者光盘等各种可以存储程序代码的介质。
显然，本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
工业实用性
如上所述，本发明实施例提供的一种设备到设备D2D传输方法及装置具有以下有益效果：解决相关技术中存在的无法实现半覆盖和覆盖外场景下的设备之间的D2D发现的问题，进而达到了实现设备之间的D2D发现的效果。

Claims (32)

  1. 一种设备到设备D2D传输方法，包括：
    设备搜索第一同步信号，根据搜索结果确定是否发送第二同步信号；
    所述设备在搜索所述第一同步信号的基础上确定用于D2D传输的资源；
    D2D信号和/或D2D数据在所述资源上传输。
  2. 根据权利要求1所述的方法，其中，所述设备搜索所述第一同步信号，根据搜索结果确定是否发送所述第二同步信号包括以下至少之一：
    如果搜索完一个扫描窗后没有搜索到所述第一同步信号，所述设备在下一个扫描窗内搜索所述第一同步信号；
    如果搜索完一个扫描窗后没有搜索到所述第一同步信号，所述设备作为独立同步源发送所述第二同步信号；
    如果完成对一个周期内的扫描窗的遍历搜索后没有搜索到所述第一同步信号，所述设备作为独立同步源发送所述第二同步信号。
  3. 根据权利要求2所述的方法，其中，包括以下至少之一：
    所述一个周期的周期长度为D2D发现资源池周期的周期长度和/或D2D通信资源池周期的周期长度；
    所述遍历搜索包括以扫描窗为时间单位完成对所述一个周期的周期长度范围内所有时间段的搜索。
  4. 根据权利要求1所述的方法，其中，所述设备搜索所述第一同步信号，根据搜索结果确定是否发送所述第二同步信号包括，包括：
    所述设备在搜索到所述第一同步信号后选择同步源，并在扫描窗内搜索新的同步信号；
    如果搜索到新的同步信号，所述设备从选择的所述同步源和发送所述新的同步信号的设备中选择优先级高的设备作为新的同步源；
    所述设备发送所述第二同步信号，其中，发送所述第二同步信号的定时为所述新的同步源的定时。
  5. 根据权利要求2至4中任一项所述的方法，其中，包括以下至少之一：
    所述扫描窗的长度为固定值或预配置的值；
    所述扫描窗的分布周期为固定值或预配置的值；
    所述设备每次的搜索范围为一个扫描窗的长度。
  6. 根据权利要求1所述的方法，其中，所述设备根据搜索结果确定是否发送所述第二同步信号之前，所述方法还包括：
    所述设备判断是否满足用于发送所述第二同步信号的发送条件，其中，所述发送条件包括：所述设备需要发送D2D信号和/或D2D数据且所述设备预先搜索到的所述第一同步信号的功率低于预设门限。
  7. 根据权利要求6所述的方法，其中，所述设备根据所述设备预先搜索到的所述第一同步信号发送所述第二同步信号包括：
    所述设备在不同于预先搜索到所述第一同步信号的同步资源的同步资源上发送所述第二同步信号。
  8. 根据权利要求6所述的方法，其中，包括：
    所述设备发送的所述第二同步信号与所述设备预先搜索到的所述第一同步信号的序列相同。
  9. 根据权利要求6所述的方法，其中，所述设备在根据所述设备预先搜索到的所述第一同步信号或所述设备已发送过的同步信号发送所述第二同步信号之后，还包括以下至少之一：
    所述设备在没有D2D信号和/或D2D数据要发送的D2D资源池周期中终止发送同步信号；
    所述设备在发送完一次同步信号后终止发送同步信号；
    所述设备在重新搜索到同步信号后终止发送同步信号；
    所述设备在预先搜索到的同步信号的定时超时后终止发送同步信号。
  10. 根据权利要求1所述的方法，其中，
    所述设备在D2D资源池周期内的每个D2D同步信号资源周期或D2D同步信号资源发送所述第二同步信号，所述D2D资源池用于发送D2D信号和/或D2D数据，所述D2D同步信号资源用于发送D2D同步信号，所述D2D同步信号：包括第二同步信号；或者，
    所述设备在以下至少之一的资源或周期内发送所述第二同步信号：D2D资源池周期内的每个同步信号资源周期，D2D同步信号资源，D2D资源池周期起始位置之前的最近一个同步信号资源周期，同步信号资源，所述D2D资源池用于发送D2D信号和/或D2D数据，所述D2D同步信号资源用于发送D2D同步信号，所述D2D同步信号：包括第二同步信号。
  11. 根据权利要求1所述的方法，其中，还包括：
    D2D广播信道PSBCH的发送。
  12. 根据权利要求1所述的方法，其中，所述设备确定用于D2D传输的资源包括以下至少之一：
    所述设备根据指示消息确定所述资源，其中，所述指示消息承载于用于资源信息指示的物理信道中，或者，所述指示消息承载于预先发送的D2D广播信道PSBCH中，所述物理信道包括新定义物理信道；
    所述设备根据搜索的所述第一同步信号确定所述资源；
    所述设备根据搜索的所述第一同步信号和指示消息确定所述资源，其中，所述指示消息承载于用于资源信息指示的物理信道中，或者，所述指示消息承载于预先发送的D2D广播信道PSBCH中，所述物理信道包括新定义物理信道；
    所述设备根据预配置资源参数确定所述资源。
  13. 根据权利要求12所述的方法，其中，所述用于资源信息指示的所述物理信道的发送包括如下方式至少之一：
    所述物理信道的发送占用的资源为所述第一同步信号之后的第一个D2D子帧，其中，所述物理信道的发送周期大于或等于发送同步信号的周期；
    所述物理信道的发送占用的资源为预配置的资源，其中，所述预配置的资源具备预定周期和预定偏移，所述物理信道的发送优先级低于蜂窝信号和/或信道的发送优先级且高于D2D信号和/或D2D数据的发送优先级；
    所述物理信道的发送占用的时域资源为用于发送所述第一同步信号的同步资源的预定子帧，频域资源为中间预定数量的物理资源块PRB之外的PRB；
    所述物理信道的发送占用的时域资源为同步资源中没有发送所述第一同步信号的子帧，频域资源为中间预定数量的物理资源库PRB之外的PRB。
  14. 根据权利要求12所述的方法，其中，所述设备根据搜索的所述第一同步信号确定所述资源包括：
    所述设备根据搜索的所述第一同步信号的子帧的位置确定所述资源。
  15. 根据权利要求14所述的方法，其中，所述资源的起始位置位于搜索到的所述第一同步信号所在的子帧之后的预定偏移范围内。
  16. 根据权利要求12所述的方法，其中，所述设备根据搜索的所述第一同步信号和指示消息确定所述资源包括：
    所述设备在搜索到所述第一同步信号后，以搜索到的所述第一同步信号所在子帧为参考，结合所述指示消息的内容，确定所述资源。
  17. 一种设备到设备D2D传输装置，应用于设备中，包括：
    搜索模块，设置为搜索第一同步信号，根据搜索结果确定是否发送第二同步信号；
    确定模块，设置为在搜索所述第一同步信号的基础上确定用于D2D传输的资源；
    传输模块，设置为D2D信号和/或D2D数据在所述资源上传输。
  18. 根据权利要求17所述的装置，其中，所述搜索模块包括以下至少之一：
    如果搜索完一个扫描窗后没有搜索到所述第一同步信号，所述设备在下一个扫描窗内搜索所述第一同步信号；
    如果搜索完一个扫描窗后没有搜索到所述第一同步信号，所述设备作为独立同步源发送所述第二同步信号；
    如果完成对一个周期内的扫描窗的遍历搜索后没有搜索到所述第一同步信号，所述设备作为独立同步源发送所述第二同步信号。
  19. 根据权利要求18所述的装置，其中，包括以下至少之一：
    所述一个周期的周期长度为D2D发现资源池周期的周期长度和/或D2D通信资源池周期的周期长度；
    所述遍历搜索包括以扫描窗为时间单位完成对所述一个周期的周期长度范围内所有时间段的搜索。
  20. 根据权利要求17所述的装置，其中，所述搜索模块包括：
    搜索单元，设置为在搜索到所述第一同步信号后选择同步源，并在扫描窗内搜索新的同步信号；
    选择单元，设置为如果搜索到新的同步信号，从选择的所述同步源和发送所述新的同步信号的设备中选择优先级高的设备作为新的同步源；
    发送单元，设置为发送所述第二同步信号，其中，发送所述第二同步信号的定时为所述新的同步源的定时。
  21. 根据权利要求18至20中任一项所述的装置，其中，包括以下至少之一：
    所述扫描窗的长度为固定值或预配置的值；
    所述扫描窗的分布周期为固定值或预配置的值；
    所述设备每次的搜索范围为一个扫描窗的长度。
  22. 根据权利要求17所述的装置，其中，所述设备根据搜索结果确定是否发送所述第二同步信号之前还包括：
    所述设备判断是否满足用于发送所述第二同步信号的发送条件，其中，所述发送条 件包括：所述设备需要发送D2D信号和/或D2D数据且所述设备预先搜索到的所述第一同步信号的功率低于预设门限。
  23. 根据权利要求22所述的装置，其中，所述设备根据所述设备预先搜索到的所述第一同步信号发送所述第二同步信号包括：
    所述设备在不同于预先搜索到所述第一同步信号的同步资源的同步资源上发送所述第二同步信号。
  24. 根据权利要求22所述的装置，其中，包括：
    所述设备发送的所述第二同步信号与所述设备预先搜索到的所述第一同步信号的序列相同。
  25. 根据权利要求22所述的装置，其中，所述设备在根据所述设备预先搜索到的所述第一同步信号或所述设备已发送过的同步信号发送所述第二同步信号之后，所述装置还包括以下至少之一：
    所述设备在没有D2D信号和/或D2D数据要发送的D2D资源池周期中终止发送同步信号；
    所述设备在发送完一次同步信号后终止发送同步信号；
    所述设备在重新搜索到同步信号后终止发送同步信号；
    所述设备在预先搜索到的同步信号的定时超时后终止发送同步信号。
  26. 根据权利要求17所述的装置，其中，
    所述设备在D2D资源池周期内的每个D2D同步信号资源周期或D2D同步信号资源发送所述第二同步信号，所述D2D资源池用于发送D2D信号和/或D2D数据，所述D2D同步信号资源用于发送D2D同步信号，所述D2D同步信号：包括第二同步信号；或者，
    所述设备在以下至少之一的资源或周期内发送所述第二同步信号：D2D资源池周期内的每个同步信号资源周期，D2D同步信号资源，D2D资源池周期起始位置之前的最近一个同步信号资源周期，同步信号资源，所述D2D资源池用于发送D2D信号和/或D2D数据，所述D2D同步信号资源用于发送D2D同步信号，所述D2D同步信号：包括第二同步信号。
  27. 根据权利要求17所述的装置，其中，还包括：
    发送模块，设置为D2D广播信道PSBCH的发送。
  28. 根据权利要求17所述的装置，其中，所述确定模块包括以下至少之一：
    所述设备根据指示消息确定所述资源，其中，所述指示消息承载于用于资源信息指示的物理信道中，或者，所述指示消息承载于预先发送的D2D广播信道PSBCH中，所 述物理信道包括新定义物理信道；
    所述设备根据搜索的所述第一同步信号确定所述资源；
    所述设备根据搜索的所述第一同步信号和指示消息确定所述资源，其中，所述指示消息承载于用于资源信息指示的物理信道中，或者，所述指示消息承载于预先发送的D2D广播信道PSBCH中，所述物理信道包括新定义物理信道；
    所述设备根据预配置资源参数确定所述资源。
  29. 根据权利要求27所述的装置，其中，所述用于资源信息指示的所述物理信道的发送包括如下方式至少之一：
    物理信道的发送占用的资源为所述第一同步信号之后的第一个D2D子帧，其中，所述物理信道的发送周期大于或等于发送同步信号的周期；
    所述物理信道的发送占用的资源为预配置的资源，其中，所述预配置的资源具备预定周期和预定偏移，所述物理信道的发送优先级低于蜂窝信号和/或信道的发送优先级且高于D2D信号和/或D2D数据的发送优先级；
    所述物理信道的发送占用的时域资源为用于发送所述第一同步信号的同步资源的预定子帧，频域资源为中间预定数量的物理资源块PRB之外的PRB；
    所述物理信道的发送占用的时域资源为同步资源中没有发送所述第一同步信号的子帧，频域资源为中间预定数量的物理资源库PRB之外的PRB。
  30. 根据权利要求27所述的装置，其中，所述设备根据搜索的所述第一同步信号确定所述资源包括：
    所述设备根据搜索的所述第一同步信号的子帧的位置确定所述资源。
  31. 根据权利要求29所述的装置，其中，所述资源的起始位置位于搜索到的所述第一同步信号所在的子帧之后的预定偏移范围内。
  32. 根据权利要求27所述的装置，其中，所述设备根据搜索的所述第一同步信号和指示消息确定所述资源包括：
    所述设备在搜索到所述第一同步信号后，以搜索到的所述第一同步信号所在子帧为参考，结合所述指示消息的内容，确定所述资源。
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