WO2016070682A1 - Procédé et dispositif de traitement synchrone dans une communication d2d - Google Patents

Procédé et dispositif de traitement synchrone dans une communication d2d Download PDF

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Publication number
WO2016070682A1
WO2016070682A1 PCT/CN2015/089668 CN2015089668W WO2016070682A1 WO 2016070682 A1 WO2016070682 A1 WO 2016070682A1 CN 2015089668 W CN2015089668 W CN 2015089668W WO 2016070682 A1 WO2016070682 A1 WO 2016070682A1
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Prior art keywords
synchronization signal
synchronization
communication
resource
resources
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PCT/CN2015/089668
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English (en)
Chinese (zh)
Inventor
黄双红
吴栓栓
杨瑾
袁弋非
王文焕
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中兴通讯股份有限公司
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Publication of WO2016070682A1 publication Critical patent/WO2016070682A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes

Definitions

  • the present invention relates to the field of communications, and in particular, to a device-to-device (D2D) communication synchronization processing method and apparatus.
  • D2D device-to-device
  • 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 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 passes the service data through the air interface. Transfer to UE2.
  • the service data transmission from UE2 to UE1 adopts a similar processing flow.
  • D2D Device-to-Device
  • ProSe Proximity Service
  • the premise of data communication between the base station and the UE is to achieve timing synchronization between the two.
  • the UE detects the downlink synchronization signal sent by the base station, including the primary synchronization signal (PSS) and the secondary synchronization.
  • PSS primary synchronization signal
  • a signal (Secondary Synchronous Signal, SSS for short) is used to implement downlink timing synchronization with the base station; and Timing Advance (TA) is used to implement uplink timing synchronization with the base station.
  • SSS Primary Synchronous Signal
  • TA Timing Advance
  • timing synchronization is also required between the D2D signal transmitting UE and the receiving UE, so that it is possible to correctly receive and demodulate the D2D signal.
  • a natural choice is to achieve synchronous timing alignment through the downlink synchronization timing or uplink synchronization timing of the cellular network system.
  • the D2D system also adopts this method to implement UE timing synchronization within the coverage. For example, the Discovery UE of Type 1 obtains a timing reference based on the downlink synchronization signal, and implements timing synchronization.
  • the technical solution discussed in the conference includes: the UE sends a D2D Synchronous Signal (D2DS Synchronous Signal, D2DSS for short) to implement synchronization between D2D UEs.
  • the D2D communication also includes the transmission of a D2D Synchronization Channel (PD2DSCH).
  • RAN1#78bis achieves the following conclusions for the D2DSS resource cycle: for both in-cover and out-of-coverage scenarios, the D2DSS resource period is fixed to 40ms, and the D2DSS resources are configured through the parameter offset. And determining, for the UE in the coverage, if the Scheduling Assignment (SA) and the D2D data are sent, the D2DSS is sent on each D2DSS resource that satisfies the condition, and if the discovery discovery signal is sent, the discovery resource is The first subframe of the pool sends D2DSS (the first subframe is a D2DSS resource), or the D2DSS resource is sent by the most recent D2DSS resource before the discovery resource pool begins.
  • SA Scheduling Assignment
  • the above conditions are met: no time domain conflict with the cellular network data transmission, D2D data or signal transmission, and a reference signal receiving power (RSRP) threshold is met, and the eNB does not receive an indication that the eNB stops transmitting the D2DSS. .
  • RSRP reference signal receiving power
  • the number of resources of the D2DSS in each period is 2, and at most one is used to transmit the D2DSS.
  • the conclusion of the #78bis conference is not different for the specific transmission mode of the D2DSS, such as the D2DSS for discovering the discovery and the communication communication, and there is no conclusion about how to use the D2DSS resource in the coverage scenario, and the transmission of the D2DSS within the coverage.
  • the conditions are not completely determined.
  • an embodiment of the present invention provides a synchronization processing method and apparatus for D2D communication.
  • a synchronization processing method for D2D communication comprising: acquiring a current synchronization signal type of the D2D UE, wherein the synchronization signal type comprises at least one of the following: discovery a synchronization signal, a communication synchronization signal, a synchronization signal shared by the discovery and the communication; determining a transmission mode of the D2D UE synchronization signal according to the current synchronization signal type.
  • acquiring the current synchronization signal type of the D2D UE including: acquiring the current synchronization signal type by using a synchronization signal sent by another D2D UE in the synchronization area, where the other D2D UE and the D2D UE
  • the synchronization area includes: a serving cell in the coverage of the cellular network, a synchronization area formed by the D2D UE outside the coverage of the cellular network as an independent synchronization source, and the independent synchronization source is a D2D UE that does not forward other synchronizations.
  • the source D2D synchronization signal transmits the synchronization source of the D2D synchronization signal by itself.
  • determining, according to the current synchronization signal type, a manner of transmitting the D2D UE synchronization signal including: when the synchronization signal type is indicated as the discovery synchronization signal, the synchronization signal of the D2D UE
  • the sending mode is that only the synchronization signal corresponding to the discovery synchronization signal is sent; when the synchronization signal type is indicated as the communication synchronization signal, the synchronization signal of the D2D UE is sent in a manner of transmitting only the communication synchronization signal.
  • Corresponding synchronization signal when the synchronization signal type is indicated as the discovery synchronization signal, the synchronization signal of the D2D UE is sent in a manner of transmitting only the communication synchronization signal.
  • the method further includes: when the synchronization signal type does not distinguish the discovery synchronization signal and the communication synchronization signal, the synchronization signal of the D2D UE is sent by sending the discovery and Communication sharing Step signal.
  • the synchronization signal sequence used by the discovery synchronization signal and the synchronization signal sequence used by the communication synchronization signal are different.
  • the synchronization signal sequence used by the discovery synchronization signal and the communication synchronization signal are orthogonal to each other.
  • the method before determining the sending manner of the D2D UE synchronization signal according to the current synchronization signal type, the method further includes: determining whether the D2D UE has a condition for transmitting a D2D synchronization signal, where the sending D2D synchronization
  • the condition of the signal includes: the D2D UE can receive other D2D UE discovery signals and/or communication data in the synchronization area.
  • the method further includes: determining, by using a plurality of D2D synchronization signal resources, a resource for transmitting the D2DUE synchronization signal, and before the step, the method further includes: synchronizing the resource period from the D2D Acquiring the plurality of D2D synchronization signal resources.
  • the determining, by using the resource for transmitting the D2D synchronization signal, the D2D UE synchronization signal includes:
  • the multiple D2D synchronization signal resources in the synchronization signal resource period are respectively set to correspond to a plurality of different time domain offsets.
  • the value of the time domain offset is determined by one of: adjusting a value of the time domain offset in advance, and setting a value of the time domain offset to be unconfigurable.
  • the determining, for transmitting the D2D synchronization signal resource, the sending the D2D UE synchronization signal includes: when the D2D UE is an independent synchronization source, in a value corresponding to multiple different time domain offsets Transmitting, by the D2D synchronization signal resource corresponding to the specified time domain offset value, the D2D synchronization signal, where the D2D UE detects the D2D synchronization signal in the D2D synchronization signal resource corresponding to the independent synchronization source, and the D2D UE Transmitting the synchronization signal on another D2D synchronization signal resource, where the other D2D synchronization signal resource is D2D in addition to the D2D synchronization signal resource corresponding to the independent synchronization source in the multiple D2D synchronization signal resources Synchronization signal resources.
  • the D2D synchronization signal forwarding power threshold is determined by one of the following methods: pre-adjusting the D2D synchronization signal forwarding power threshold, and setting the D2D synchronization signal forwarding power threshold to be unavailable. Configuration.
  • the synchronization signal of the D2D UE is sent by the synchronization signal resource, including: grouping the UE according to the group identifier ID or the UE identifier of the UE, and the different groups of UEs use the different D2D synchronization signal resources to send the synchronization.
  • the condition for transmitting the D2D synchronization signal comprises: the received power of the D2D synchronization signal is less than a D2D synchronization signal forwarding power threshold, and the other synchronization signal resources are a synchronization signal resource other than the synchronization signal resource corresponding to the specified time domain offset value, wherein the other synchronization source is the bee Synchronization in the nest network other than the D2D UE synchronization source; and/or for each M synchronization signal resource period, selecting a specified period does not transmit a D2D synchronization signal, a D2D discovery signal on the synchronization signal resource, and D2D communication data, the D2D
  • a synchronization processing method for device-to-device D2D communication comprising: receiving a synchronization signal sent by a D2D user equipment UE; determining, according to the synchronization signal, the D2D UE a current synchronization signal type, wherein the synchronization signal type includes at least one of: a discovery synchronization signal, a communication synchronization signal, a discovery and a communication sharing synchronization signal; and synchronizing the synchronization signal of the D2D UE according to the synchronization signal type .
  • the synchronization signal sequence used by the discovery synchronization signal and the synchronization signal sequence used by the communication synchronization signal are different.
  • the synchronization signal sequence used by the discovery synchronization signal and the synchronization signal sequence used by the communication synchronization signal are orthogonal to each other.
  • the method before receiving the synchronization signal sent by the D2D user equipment UE, the method further includes: setting, for the UE outside the coverage of the cellular network, multiple D2D synchronization signal resources in the synchronization period respectively corresponding to multiple different time domain offsets shift.
  • the method further includes: synchronizing a D2D synchronization signal in a synchronization signal resource corresponding to a time domain offset value corresponding to the plurality of different time domain offset values Selecting and/or reselecting the process; or, synchronizing the source selection and/or reselection process according to the synchronization signal resource corresponding to the D2D synchronization signal with the highest received power of the synchronization signal; and detecting the D2D synchronization signal on the other synchronization signal resources as The D2D data receiving synchronization reference, wherein the other synchronization resource is a synchronization signal resource other than the synchronization signal resource corresponding to the specified time domain offset value in the plurality of D2D synchronization signal resources.
  • the method further includes: detecting, by the D2D UE, a D2D synchronization signal in a synchronization signal resource corresponding to an independent synchronization source, and the received power of the D2D synchronization signal is smaller than a D2D synchronization signal forwarding power gate.
  • the D2D UE sends the synchronization signal on other synchronization signal resources, where the other synchronization signal resources are in the multiple D2D synchronization signal resources, except the specified time domain offset value a synchronization signal resource outside the corresponding synchronization signal resource; and/or selecting a synchronization signal resource corresponding to the specified time domain offset value to transmit the D2D synchronization signal, and selecting a value corresponding to the plurality of different time domain offsets, and Detecting, by the other synchronization signal resources, the D2D synchronization signal sent by the other synchronization source and/or the D2D UE, wherein the condition for transmitting the D2D synchronization signal comprises: the received power of the D2D synchronization signal is less than the D2D synchronization signal forwarding power threshold.
  • the other synchronization signal resource is a synchronization signal other than the synchronization signal resource corresponding to the specified time domain offset value in the plurality of D2D synchronization signal resources.
  • Source the other synchronization source is synchronization in the cellular network except the D2D UE synchronization source; and/or for each M synchronization signal resource period, selecting a specified period on the synchronization signal resource Transmitting a D2D synchronization signal, a D2D discovery signal, and D2D communication data, the D2D UE scanning D2D synchronization signals sent by other synchronization sources and/or D2D UEs in the synchronization period, where M is a positive integer.
  • the value of the time domain offset is determined by one of: adjusting a value of the time domain offset in advance, and setting a value of the time domain offset to be unconfigurable.
  • a device-to-device D2D communication synchronization processing apparatus comprising: an acquisition module configured to acquire a current synchronization signal type of the D2D UE, wherein the synchronization signal The type includes at least one of: a synchronization signal, a communication synchronization signal, a synchronization signal shared by the discovery and the communication; and a determination module configured to determine a transmission manner of the D2D UE synchronization signal according to the current synchronization signal type.
  • the acquiring module is configured to acquire the current synchronization signal type by using a synchronization signal sent by another D2D UE in the synchronization area, where the other D2D UE and the D2D UE belong to the same synchronization area.
  • the synchronization area includes: a serving cell in a coverage of the cellular network, and a synchronization area formed by the D2D UE outside the coverage of the cellular network as an independent synchronization source, where the independent synchronization source is a D2D synchronization signal that the D2D UE does not forward other synchronization sources,
  • the synchronization source of the D2D synchronization signal is sent by itself.
  • the determining module includes: a first sending unit, configured to: when the synchronization signal type indicates the discovery synchronization signal, the sending manner of the synchronization signal of the D2D UE is only a sending The synchronization signal corresponding to the synchronization signal is found; the second sending unit is configured to: when the synchronization signal type is indicated as the communication synchronization signal, the synchronization signal of the D2D UE is sent by transmitting only the communication synchronization signal Corresponding synchronization signal.
  • the device further includes: a setting module, configured to set, for the UE outside the coverage of the cellular network, multiple D2D synchronization signal resources in the synchronization signal resource period to correspond to different time domain offsets respectively .
  • a synchronization processing apparatus for device-to-device D2D communication, the apparatus comprising: a receiving module configured to receive a synchronization signal sent by a D2D user equipment UE; and a determining module configured to The synchronization signal determines a current synchronization signal type of the D2D UE, wherein the synchronization signal type includes at least one of: a discovery synchronization signal, a communication synchronization signal, a discovery and a communication sharing synchronization signal; and a synchronization processing module configured to The synchronization signal type performs synchronization processing on the synchronization signal of the D2D UE.
  • the device further includes: a setting module, configured to set, for the UE outside the coverage of the cellular network, the plurality of D2D synchronization signal resources in the synchronization period to correspond to the plurality of different time domain offsets respectively.
  • a setting module configured to set, for the UE outside the coverage of the cellular network, the plurality of D2D synchronization signal resources in the synchronization period to correspond to the plurality of different time domain offsets respectively.
  • the device further includes: a selecting module, configured to: specify D2D in the synchronization signal resource corresponding to the time domain offset value in the value corresponding to the plurality of different time domain offsets
  • the synchronization signal performs a synchronization source selection and/or a reselection process; and is further configured to perform a synchronization source selection and/or a reselection process according to the synchronization signal resource corresponding to the D2D synchronization signal with the highest received power of the synchronization signal; the processing module is set to be in other
  • the D2D synchronization signal detected on the synchronization signal resource is used as a D2D data reception synchronization reference, wherein the other synchronization resource is a synchronization signal corresponding to the specified time domain offset value in the plurality of D2D synchronization signal resources. Synchronization signal resources outside the resource.
  • a technical solution according to the current synchronization signal type of the D2D UE that is, the synchronization signal type is distinguished, and then the synchronization signal transmission manner is determined according to the synchronization signal type, and the D2D discovery and the difference in the related art are not implemented.
  • the transmission processing mode in the case of the D2D synchronization signal of communication enables the transmission mode of the D2D UE synchronization signal to be determined according to the synchronization signal type when the synchronization signal type is distinguished.
  • FIG. 1 is a schematic diagram 1 of cellular communication and D2D communication of a UE located in the same base station cell in the related art
  • FIG. 2 is a schematic diagram 2 of cellular communication and D2D communication of a UE 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 a cellular network deployment in the related art
  • FIG. 5 is a flowchart of a synchronization processing method of D2D communication according to an embodiment of the present invention.
  • FIG. 6 is a structural block diagram of a synchronization processing apparatus for D2D communication according to an embodiment of the present invention.
  • FIG. 7 is a block diagram showing still another structure of a synchronization processing apparatus for D2D communication according to an embodiment of the present invention.
  • FIG. 8 is still another flowchart of a synchronization processing method for D2D communication according to an embodiment of the present invention.
  • FIG. 9 is a block diagram showing still another structure of a synchronization processing apparatus for D2D communication according to an embodiment of the present invention.
  • FIG. 10 is a block diagram showing still another structure of a synchronization processing apparatus for D2D communication according to an embodiment of the present invention.
  • FIG. 11 is a diagram showing an example of an inter-cell D2D synchronization scenario according to a preferred embodiment of the present invention.
  • FIG. 12 is a diagram showing an example of D2DSS transmission conditions according to a preferred embodiment of the present invention.
  • FIG. 13 is a diagram showing an example of D2DSS transmission processing according to a preferred embodiment 2 of the present invention.
  • FIG. 14 is a diagram showing an example of distribution and use of D2DSS resources according to a preferred embodiment 3 of the present invention.
  • FIG. 15 is a diagram showing an example of an overlay external D2DSS transmission scenario according to a preferred embodiment 3 of the present invention.
  • Figure 16 is a diagram showing an example of synchronization source selection/reselection in accordance with a preferred embodiment 4 of the present invention.
  • 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, abbreviated as SC-FDMA) technology.
  • CDMA Code Division Multiplexing Access
  • FDMA Frequency Division Multiplexing Access
  • Orthogonal-FDMA orthogonal frequency division multiple access
  • OFDMA single carrier frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • LTE Long Term Evolution
  • LTE-A Advanced Long Term Evolution
  • downlink is based on OFDMA technology
  • uplink is based on SC-FDMA multiple access technology and it is also possible to support hybrid multiple access techniques on one link.
  • 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 length 0.5 ms, as shown in FIG.
  • each time slot may include 6 or 7 OFDM or SC-FDM symbols.
  • the resources are divided into subcarriers.
  • the smallest unit of frequency domain resource allocation is RB (Resource Block), and one PRB (Physical RB) of the corresponding physical resource. ).
  • 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 called a resource element (RE element).
  • the user equipment UE discovers the LTE network by detecting a synchronization signal (Synchronization Signal, SS for short).
  • the synchronization signal includes PSS and SSS.
  • the UE obtains downlink frequency and time synchronization with the base station.
  • 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 needs to initiate random access (RA) for uplink synchronization and establish a Radio Resource Control (RRC) connection, that is, from RRC idle (Idle). The state enters the RRC Connected state.
  • 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.
  • RA Random access
  • RRC Radio Resource Control
  • a network device In an access network of a cellular radio communication system, a network device generally includes a certain number of base stations (also referred to as a Node B, a Node B, or an evolved Node B, an evolved Node B, an eNB, or an enhanced Node B, Enhanced Node B, eNB), and other network entities or network elements. Alternatively, it may 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 referred to herein also includes a Low Power Node (LPN) in the network, such as a femto cell or a home base station (pico, relay, femto, HeNB, Home eNB, etc.).
  • LPN Low Power Node
  • the base station provides a certain wireless signal coverage range, and the terminal (terminal, or user setting) within the coverage area
  • the User Equipment, UE, or device can communicate wirelessly 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 D2D UE acquires the transmission timing and/or the receiving timing of the corresponding D2D signal to complete the transmission and/or reception of the corresponding D2D signal.
  • the downlink synchronization signal sent by the base station is synchronized with the base station, so as to achieve synchronization between the UEs.
  • the synchronization between the UEs cannot be achieved by the synchronization signal of the base station, but the D2D synchronization is implemented by detecting the D2D synchronization signal sent by the D2D UE.
  • the D2D sync signal resource period is fixed at 40ms.
  • the synchronization of D2D also involves the transmission and detection processing of the D2D synchronization signal, but there is no consensus conclusion in the related art for the transmission processing method after the classification of the synchronization signal type.
  • FIG. 5 is a flowchart of a synchronization processing method for D2D communication according to an embodiment of the present invention. As shown in FIG. 5, the flow includes The following steps:
  • Step S502 Acquire a current synchronization signal type of the D2D UE, where the synchronization signal type includes at least one of: a synchronization signal, a communication synchronization signal, a synchronization signal shared by the discovery and the communication;
  • Step S504 determining a manner of transmitting the D2D UE synchronization signal according to the current synchronization signal type.
  • the transmission processing mode in the case of the D2D synchronization signal enables the transmission mode of the D2D UE synchronization signal to be determined according to the synchronization signal type when the synchronization signal type is distinguished.
  • the synchronization signal of the type of the synchronization signal being shared by the discovery and the communication can be understood as a technical solution for not distinguishing the synchronization signals. Whether the type of the synchronization signal is differentiated can be selected according to actual needs. .
  • the step S502 may be implemented in multiple manners.
  • the method may be implemented in the following manners: 1) acquiring the current synchronization signal type in a D2D resource period; 2) passing the synchronization area.
  • the synchronization signal sent by the other D2D UEs acquires the current synchronization signal type, where the other D2D UEs and the D2D UE belong to the same synchronization area, and the synchronization area includes: a serving cell in the coverage of the cellular network, and a D2D UE outside the coverage of the cellular network.
  • the independent synchronization source is a D2D synchronization signal that the D2D UE does not forward other synchronization sources, and the synchronization source of the D2D synchronization signal is sent by itself; 3) the synchronization signal obtained by other UEs in the coverage of the cellular network is obtained.
  • the current synchronization signal type wherein the other UEs and the D2D UEs are all within the coverage of the cellular network.
  • the synchronization signal of the D2D UE is sent by only transmitting the synchronization signal corresponding to the discovery synchronization signal;
  • the synchronization signal of the D2D UE is transmitted in a manner of transmitting only the synchronization signal corresponding to the communication synchronization signal.
  • the synchronization signal of the D2D UE is sent in the manner of transmitting the synchronization signal shared by the discovery and the communication.
  • the synchronization signal sequence used by the discovery synchronization signal is different from the synchronization signal sequence used by the communication synchronization signal, and the synchronization signal sequence used by the discovery synchronization signal and the communication synchronization signal may be different by mutually orthogonal manner.
  • step S504 After performing the technical solution of step S504, in the embodiment of the present invention, the following process may also be performed: transmitting the synchronization signal of the D2D UE in the synchronization signal resource.
  • the following technical process may be performed: determining whether the D2D UE has a condition for transmitting the D2D synchronization signal, where the condition for transmitting the D2D synchronization signal includes: the D2D UE can receive other D2D UE discovery signals in the synchronization area. And / or communication data.
  • the embodiment of the present invention further provides the following technical solution: before the synchronization signal resource sends the synchronization signal of the D2D UE, performing the following process: setting the synchronization signal resource period for the UE outside the coverage of the cellular network
  • the plurality of D2D synchronization signal resources respectively correspond to a plurality of different time domain offsets, wherein the value of the time domain offset may be adjusted in advance as needed, or the value of the time domain offset may be preset to be a fixed value.
  • the synchronization signal resource corresponding to the specified time domain offset value is selected to send the synchronization signal; it should be noted that the foregoing process of selecting a time domain offset value may have multiple implementation schemes, which may be multiple The maximum value of the values of the time domain offsets may also be selected as the minimum value. The process may be flexibly adjusted according to the actual situation.
  • the embodiments of the present invention are not limited to the above technical solutions.
  • the method further includes: determining, in the plurality of D2D synchronization signal resources, a resource for transmitting the D2DUE synchronization signal, and before the step, the method further includes: synchronizing the resource period from the D2D Acquiring the plurality of D2D synchronization signal resources.
  • the determining, by the resource for transmitting the D2D synchronization signal, the D2D UE synchronization signal includes: setting, for the D2D UE outside the coverage of the cellular network, multiple D2D synchronization signal resources in the synchronization signal resource period respectively corresponding to different Time domain offset.
  • determining to send the D2D synchronization signal resource to send the D2D UE synchronization signal includes: when the D2D UE is an independent synchronization source, in multiple different time domain offsets And selecting, by the D2D synchronization signal resource corresponding to the specified time domain offset value, the D2D synchronization signal, where the D2D UE detects the D2D synchronization signal in the D2D synchronization signal resource corresponding to the independent synchronization source, And the D2D UE sends the synchronization signal on other D2D synchronization signal resources, where the other D2D synchronization signal resources are in the multiple In the D2D synchronization signal resource, a D2D synchronization signal resource other than the D2D synchronization signal resource corresponding to the independent synchronization source.
  • the following embodiments are provided, but are not limited thereto.
  • the embodiments of the present invention provide the following examples of how to transmit a synchronization signal on a synchronization signal resource.
  • the D2D UE detects the D2D synchronization signal in the synchronization signal resource corresponding to the independent synchronization source, and the received power of the D2D synchronization signal is less than the D2D synchronization signal forwarding power threshold, the D2D UE is in other synchronization signal resources.
  • the synchronization signal is transmitted based on the timing of the D2D synchronization signal, wherein the other synchronization signal resource is a synchronization signal resource other than the synchronization signal resource corresponding to the independent synchronization source among the plurality of D2D synchronization signal resources.
  • the D2D synchronization signal receiving power threshold may be adjusted in advance as needed, or may be set to be unconfigurable.
  • the UE is grouped according to the group ID or the UE identifier of the UE, and the UEs of different groups use the different D2D synchronization signal resources to send the synchronization signal.
  • the synchronization signal resource corresponding to the specified time domain offset value select the synchronization signal resource corresponding to the specified time domain offset value to send the D2D synchronization signal, and detect other synchronization sources and/or other synchronization signal resources.
  • the D2D synchronization signal sent by the D2D UE wherein the condition for transmitting the D2D synchronization signal comprises: the received power of the D2D synchronization signal is less than a D2D synchronization signal forwarding power threshold, and the other synchronization signal resources are resources of the multiple D2D synchronization signals.
  • selecting a designated period does not send a D2D synchronization signal, a D2D discovery signal, and D2D communication data on the synchronization signal resource, and the D2D UE scans other synchronization sources during the synchronization period.
  • a D2D synchronization signal sent by the D2D UE where M is a positive integer, for example, when M is equal to 4, in every four cycles, selecting one cycle does not send a D2D synchronization signal on the above-mentioned synchronization signal resource, and D2D discovery
  • the signal, and the D2D communication data preferably, may be selected to not transmit the D2D synchronization signal, the D2D discovery signal, and the D2D communication data on the synchronization signal resource on the fourth period of every four cycles.
  • the following technical solution may also be implemented: if the D2D synchronization signal resource overlaps with the transmission resource of the D2D signal and/or data, the D2D synchronization signal is preferentially transmitted; if the D2D synchronization signal resource and the D2D signal and/or If the receiving resources of the data overlap, the D2D synchronization signal is preferentially transmitted, but the technical solution of the embodiment of the present invention is not limited.
  • a synchronization processing device for D2D communication is also 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 synchronization processing apparatus for D2D communication according to an embodiment of the present invention. As shown in FIG. 6, the apparatus includes:
  • the obtaining module 60 is configured to acquire the current synchronization signal type of the D2D UE, where the synchronization signal type includes at least one of the following: a synchronization signal, a communication synchronization signal, a synchronization signal shared by the discovery and the communication;
  • the determining module 62 is connected to the obtaining module 60, and is configured to determine a sending manner of the D2D UE synchronization signal according to the current synchronization signal type.
  • the transmission processing mode in the case of discovering and communicating the D2D synchronization signal enables the transmission mode of the D2D UE synchronization signal to be determined according to the synchronization signal type when the synchronization signal type is distinguished.
  • the obtaining module 60 is further configured to acquire the current synchronization signal type in the D2D resource period; 2) the obtaining module 60 is further configured to acquire the current synchronization signal type by using a synchronization signal sent by another D2D UE in the synchronization area,
  • the other D2D UE and the D2D UE belong to the same synchronization area, and the synchronization area includes: a serving cell in the coverage of the cellular network, a synchronization area formed by the D2D UE outside the coverage of the cellular network as an independent synchronization source, and the independent synchronization source.
  • the D2D UE does not forward the D2D synchronization signal of the other synchronization source, and sends the synchronization source of the D2D synchronization signal by itself; 3) the acquisition module 60 is further configured to acquire the current synchronization signal type by using the synchronization signal sent by other UEs in the coverage of the cellular network, where The other UEs and the D2D UEs are all within the coverage of the cellular network.
  • the determining module 62 may further include: a first sending unit 620, configured to send, when the synchronization signal type indicates the discovery synchronization signal, that the synchronization signal of the D2D UE is sent only The synchronization signal corresponding to the synchronization signal is found; the second sending unit 622 is configured to: when the synchronization signal type is indicated as the communication synchronization signal, the synchronization signal of the D2D UE is sent by transmitting only the communication synchronization signal. Synchronization signal.
  • the foregoing apparatus further includes: a sending module 64, configured to send the synchronization signal of the D2D UE in the synchronization signal resource.
  • a sending module 64 configured to send the synchronization signal of the D2D UE in the synchronization signal resource.
  • the foregoing apparatus further includes: a setting module 66, configured to set, for the UE outside the coverage of the cellular network, multiple D2D synchronization signal resources in the synchronization signal resource period respectively. Different time domain offsets.
  • FIG. 8 is a D2D communication according to an embodiment of the present invention.
  • Step S802 receiving a synchronization signal sent by the D2D user equipment UE.
  • Step S804 determining a current synchronization signal type of the D2D UE according to the synchronization signal, where the synchronization signal type includes at least one of: a discovery synchronization signal, a communication synchronization signal, a discovery and a communication sharing synchronization signal;
  • Step S806 synchronizing the synchronization signals of the D2D UE according to the synchronization signal type.
  • the synchronization signal sequence used by the discovery synchronization signal is different from the synchronization signal sequence used by the communication synchronization signal.
  • the synchronization signal sequence used by the discovery synchronization signal and the communication synchronization signal may be made in a mutually orthogonal manner.
  • the sync signal sequence used is different.
  • step S802 before performing step S802, the following process may also be performed: for a UE outside the coverage of the cellular network, setting a plurality of D2D synchronization signal resources in the synchronization period respectively correspond to a plurality of different Time domain offset.
  • the synchronization signal resource corresponding to the specified time domain offset value is selected to send the synchronization signal; it should be noted that the foregoing process of selecting a time domain offset value may have multiple implementation schemes, which may be multiple The maximum value of the values of the time domain offsets may also be selected as the minimum value. The process may be flexibly adjusted according to the actual situation.
  • the embodiments of the present invention are not limited to the above technical solutions.
  • the following examples are provided for the synchronization source selection and/or reselection process on the synchronization signal resource corresponding to the specified time domain offset value, but are not limited thereto.
  • the synchronization source selection and/or reselection process is performed according to the synchronization signal resource corresponding to the D2D synchronization signal with the highest received power of the synchronization signal; the D2D synchronization signal detected on the other synchronization signal resources is used as the D2D data reception synchronization reference, wherein
  • the other synchronization resource is a synchronization signal resource other than the synchronization signal resource corresponding to the specified time domain offset value among the plurality of D2D synchronization signal resources.
  • the synchronization signal resource corresponding to the specified time domain offset value select the synchronization signal resource corresponding to the specified time domain offset value to send the D2D synchronization signal, and detect other synchronization sources and/or other synchronization signal resources.
  • the D2D synchronization signal sent by the D2D UE wherein the condition for transmitting the D2D synchronization signal comprises: the received power of the D2D synchronization signal is less than a D2D synchronization signal forwarding power threshold, and the other synchronization signal resources are resources of the multiple D2D synchronization signals.
  • selecting a designated period does not send a D2D synchronization signal, a D2D discovery signal, and D2D communication data on the synchronization signal resource, and the D2D UE scans other synchronization sources during the synchronization period.
  • a D2D synchronization signal sent by the D2D UE where M is a positive integer, for example, when M is equal to 4, in every four cycles, selecting one cycle does not send a D2D synchronization signal on the above-mentioned synchronization signal resource, and D2D discovery
  • the signal, and the D2D communication data preferably, may be selected to not transmit the D2D synchronization signal, the D2D discovery signal, and the D2D communication data on the synchronization signal resource on the fourth period of every four cycles.
  • the D2D UE detects the D2D synchronization signal in the synchronization signal resource corresponding to the independent synchronization source, and the received power of the D2D synchronization signal is less than the D2D synchronization signal forwarding power threshold, the D2D UE is in other synchronization signal resources. And transmitting the synchronization signal, wherein the other synchronization signal resource is a synchronization signal resource other than the synchronization signal resource corresponding to the specified time domain offset value among the plurality of D2D synchronization signal resources.
  • the D2D synchronization signal forwarding power threshold may be adjusted in advance as needed, or may be set to be unconfigurable.
  • a synchronization processing device for D2D communication is also 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. 9 is still another structural block diagram of a synchronization processing apparatus for D2D communication according to an embodiment of the present invention. As shown in FIG. 9, the apparatus includes:
  • the receiving module 90 is configured to receive a synchronization signal sent by the D2D user equipment UE.
  • the determining module 92 is connected to the receiving module 90, and is configured to determine a current synchronization signal type of the D2D UE according to the synchronization signal, where the synchronization signal type includes at least one of the following: a discovery synchronization signal, a communication synchronization signal, a discovery, and a communication sharing. Synchronization signal
  • the synchronization processing module 94 is connected to the determination module 94 and configured to perform synchronization processing on the synchronization signal of the D2D UE according to the synchronization signal type.
  • the technical solution of synchronizing the synchronization signal of the D2D UE according to the type of the synchronization signal of the D2D UE, that is, the synchronization signal type of the D2D UE, and the synchronization signal type according to the synchronization signal type solves the related art in the related art.
  • the transmission processing mode in the case of distinguishing the D2D synchronization signal of D2D discovery and communication has not been implemented, so that when the synchronization signal type is distinguished, the transmission mode of the D2D UE synchronization signal can be determined according to the synchronization signal type.
  • the foregoing apparatus further includes: a setting module 96, configured to set, for a UE outside the coverage of the cellular network, a plurality of D2D synchronization signal resources in the synchronization period respectively corresponding to different times Domain offset.
  • a setting module 96 configured to set, for a UE outside the coverage of the cellular network, a plurality of D2D synchronization signal resources in the synchronization period respectively corresponding to different times Domain offset.
  • the foregoing apparatus further includes: a selecting module 98, configured to: in the synchronization signal resource corresponding to the time domain offset value specified in the value corresponding to the multiple different time domain offsets
  • the D2D synchronization signal performs a synchronization source selection and/or reselection process; and is further configured to perform a synchronization source selection and/or a reselection process according to the synchronization signal resource corresponding to the D2D synchronization signal with the highest received power of the synchronization signal;
  • the processing module 100 sets The D2D synchronization signal detected on the other synchronization signal resources is used as the D2D data reception synchronization reference, wherein the other synchronization resource is a synchronization signal corresponding to the specified time domain offset value in the plurality of D2D synchronization signal resources. Synchronization signal resources outside the resource.
  • the foregoing apparatus further includes: a sending module 102, configured to detect, in the D2D UE, a D2D synchronization signal in a synchronization signal resource corresponding to the independent synchronization source, and the received power of the D2D synchronization signal is less than a D2D synchronization signal.
  • a sending module 102 configured to detect, in the D2D UE, a D2D synchronization signal in a synchronization signal resource corresponding to the independent synchronization source, and the received power of the D2D synchronization signal is less than a D2D synchronization signal.
  • the D2D UE Receiving the power threshold, the D2D UE transmitting the synchronization signal on another synchronization signal resource, where the other synchronization signal resource is in the multiple D2D synchronization signal resources, except for the specified time domain offset value Synchronization signal resources outside the synchronization signal resource.
  • FIG. 11 is a diagram showing an example of an inter-cell D2D synchronization scenario according to a preferred embodiment of the present invention, such as the inter-cell D2D scenario shown in FIG. It is assumed that UE1, UE2, and UE3 are both close to the cell edge, and UE1 has a discovery signal to be transmitted, but the corresponding RSRP value is greater than the RSRP threshold for transmitting the D2DSS; UE2 does not find the signal to be transmitted, and the corresponding RSRP value is smaller than the RSRP threshold for transmitting the D2DSS. In addition, it is assumed that both UE1 and UE2 satisfy other conditions for transmitting D2DSS.
  • the subframe corresponding to the resource for transmitting the D2DSS does not collide with the cellular signal, and does not collide with the detection D2DSS.
  • UE1 and UE2 have the capability of transmitting D2DSS, and have not received the stop. Send D2DSS instructions, etc.
  • the D2DSS Since the RSRP of the UE1 does not satisfy the threshold decision, the D2DSS is not transmitted. In this case, if the UE3 cannot detect the D2DSS transmitted by other UEs of the Cell 1, the D2D discovery signal transmitted by the UE1 cannot be received.
  • the UE2 satisfies the RSRP threshold decision.
  • the UE2 does not have the D2D discovery signal transmission, if the UE1 discovery signal can be received, the D2DSS is transmitted.
  • the UE3 can detect the D2DSS sent by the UE2, obtain the D2D discovery signal transmission timing of the Cell 1, and receive the D2D discovery signal sent by the UE1.
  • the D2DSS resource overlaps with the D2D discovery signal transmission resource or/and the reception resource.
  • 500 and 503 are D2D discovery signal transmission resources and reception resources, respectively, and 501 and 502 respectively represent D2DSS resources that conflict with D2D discovery signal transmission resources and reception resources.
  • the D2DSS resources corresponding to 501 and 502 are preferentially transmitted.
  • the D2D discovery UE and the communication UE select a sequence to transmit D2DSS from different groups, such as Group 1 and Group 2, and the sequences in Group 1 and Group 2 are orthogonal to each other.
  • the D2D discovery UE determines the D2DSS transmission condition according to the corresponding discovery, and if the condition is met, selects the sequence in the group 1 to transmit the D2DSS; likewise, the D2D communication UE decides according to the D2DSS transmission condition of the corresponding communication, if the condition is met, Then select the sequence in group 2 to send D2DSS.
  • the D2D UE has both D2D discovery requirements
  • there is a D2D communication requirement and the decision is made according to the found D2DSS transmission condition and the D2DSS transmission condition of the communication. If the D2DSS transmission conditions of the discovery and communication are both satisfied, the D2D UE transmits both the D2DSS corresponding to the sequence in the group 1 and the D2DSS corresponding to the sequence in the group 2.
  • the D2DSS transmission condition of the corresponding communication is satisfied, and in the corresponding discovery period, the corresponding discovered D2DSS transmission condition is also satisfied, such that, in the D2DSS resource 600, There are both the D2DSS of the sequence in Group 1 and the D2DSS of the sequence in Group 2.
  • the D2DSS transmission conditions for D2D communication are satisfied, and only D2DSS for D2D communication is transmitted.
  • only the D2DSS transmission condition found by D2D is satisfied, and only the D2DSS discovered by D2D is transmitted.
  • the D2D UE can detect the D2DSS of the D2D discovery and the D2DSS of the D2D communication in the D2DSS resource 600, and then detect the receiving resource pool and the communication receiving resource pool in the corresponding D2D to detect
  • the D2DSS to the synchronous reference receives the D2D discovery signal and communication data.
  • only the D2DSS of the D2D communication can be detected, so that the receiving UE only receives the D2D communication data in the D2D communication receiving resource pool; likewise, in 603, only the D2D discovery D2DSS can be detected, so that the receiving UE only discovers the receiving resource in the D2D.
  • the pool receives the D2D discovery signal.
  • the D2D discovery UE decides according to the corresponding D2DSS transmission condition, and if the condition is met, transmits the D2DSS; likewise, the D2D communication UE decides according to the D2DSS transmission condition of the corresponding communication. If the condition is met, the D2DSS is sent; if the D2D UE has both the D2D discovery requirement and the D2D communication requirement, the D2DSS transmission condition and the D2DSS transmission condition of the communication are respectively determined, and the judgment result of the two is logically ORed. An operation is performed to obtain a result of whether the D2D UE transmits the D2DSS. That is, for the found D2DSS transmission condition and the D2DSS transmission condition decision of the communication, the D2D UE transmits the D2DSS as long as one is satisfied.
  • FIG. 1 An example of the distribution and use of the out-of-band D2DSS resources is shown in FIG.
  • the D2DSS resources 700 and 701 respectively correspond to the time offset 1 and the time offset 2, respectively, in time, 700 before, and 701 after, respectively, in the first half and the second half of the D2DSS resource period.
  • D2DSS resources 700 and 701 respectively correspond to the time offset 1 and the time offset 2, respectively, in time, 700 before, and 701 after, respectively, in the first half and the second half of the D2DSS resource period.
  • FIG. SS800 and SS801 are independent synchronization sources D2DUE, which form their own synchronization areas.
  • the UE 802 and the UE 803 belong to the synchronization area of the SS 800, and the UE 804 belongs to the synchronization area of the SS 801.
  • the D2DSS is first scanned at the corresponding D2DSS resource 700. If the valid D2DSS can be detected, that is, the threshold decision that becomes the independent synchronization source is not satisfied, the D2D data is transmitted with the detected D2DSS as the synchronization reference; and if the valid D2DSS is not detected, the threshold determination that becomes the independent synchronization source is satisfied, then The D2DSS is sent at resource 700.
  • S800 and SS801 can only send D2DSS in D2DSS resource 700, and UEs 802 and 803 can detect D2DSS sent by SS800 in D2DSS resource 700, then select SS800 as synchronization source, and send and receive D2D data with corresponding synchronization reference.
  • the D2D UE After detecting the D2DSS of the synchronization source, the D2D UE determines the average received power of the D2DSS based on the D2DSS forwarding threshold, and forwards the D2DSS to the D2DSS resource 701 if the decision condition is met, and the value of the forwarding threshold is pre-configured or fixed. value. For example, the UE 802 detects the D2DSS of the SS800 at 700, compares the average received power of the D2DSS with the forwarding threshold, and determines that it is less than the forwarding threshold, and then forwards the D2DSS from the SS800 at 701.
  • the UE 804 can detect the D2DSS forwarded by the UE 802, the D2D data sent by the UE 802 can be received.
  • the UE 803 is close to the center of the synchronization area. If it is detected that the D2DSS of the SS800 does not satisfy the forwarding condition, the D2DSS is not forwarded.
  • the offset values corresponding to the D2DSS resources 700 and 701, that is, the values of the time offset 1 and the time offset 2, are pre-configured or fixed values.
  • the UE determines the time offset of the detected D2DSS corresponding resource according to the periodic configuration of the D2DSS resource and the DFN obtained from the D2D synchronization channel, and compares it with the time offset 1 and the time offset 2, It can be determined whether the resource corresponding to the detected D2DSS is 700 or 701.
  • the D2D UE can only select/reselect the synchronization source process based on the D2DSS detected by the resource 700 in FIG.
  • FIG. 1 An example of selecting/reselecting a synchronization source is shown in FIG.
  • the UE 901 forwards the D2DSS at the resource 701.
  • the UE 902 may simultaneously detect the D2DSS sent by the SS900 and the UE 901, but on different resources. Assuming that the UE 902 is an isolated D2D UE and does not detect the D2DSS sent by other UEs, the D2DSS detected on the resource 700 is directly selected as the synchronization reference.
  • the UE 902 If the UE 902 has a synchronization source, or can detect other D2DSS at the same time, compare the D2DSS detected at 700 with the existing D2DSS or other D2DSS, and determine a new synchronization source according to the synchronization source selection criteria. For the D2DSS detected on the resource 701, the UE 902 only uses it as a synchronization reference for receiving the D2D data sent by the UE 901 and other UEs in the synchronization area.
  • the UE 902 can only detect the D2DSS forwarded by the UE 901, and no other D2DSS is detected in the resource 700. If the UE 902 has D2D data to be transmitted, the UE 902 sends the D2DSS in the resource 700 to become an independent synchronization source; if the UE 902 does not have D2D data transmission, Then, the detected D2DSS is used as a synchronization reference, and the synchronization reference of the D2D data sent by the UE 901 and other UEs in the synchronization area is received.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve. Thus, the invention is not limited to any specific combination of hardware and software.
  • a storage medium is further provided, wherein the software includes the above-mentioned software, including but not limited to: an optical disk, a floppy disk, a hard disk, an erasable memory, and the like.
  • the embodiment of the present invention achieves the following technical effects: the transmission processing mode in the case of the D2D synchronization signal in which the D2D discovery and communication are not realized in the related art is solved, so that the synchronization signal type can also be realized when the synchronization signal type is distinguished. Determine how the D2D UE synchronization signal is sent.
  • 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 technical solution provided by the embodiment of the present invention can be applied to a synchronization process of D2D communication, and adopts a technology according to a current synchronization signal type of a D2D UE, that is, a synchronization signal type is distinguished, and then a synchronization signal transmission mode is determined according to a synchronization signal type.
  • the solution solves the transmission processing mode in the case of the D2D synchronization signal in which the D2D discovery and communication are not realized in the related art, so that when the synchronization signal type is distinguished, the transmission mode of the D2D UE synchronization signal according to the synchronization signal type can also be implemented. .

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Abstract

La présente invention concerne un procédé et un dispositif de traitement synchrone dans une communication de dispositif à dispositif (D2D). Le procédé consiste à : obtenir un type de signal synchrone en cours d'un équipement utilisateur (UE) D2D, le type de signal synchrone comprenant au moins un signal synchrone de découverte, un signal synchrone de communication, ou un signal synchrone utilisé conjointement pour la découverte et pour la communication ; et déterminer un procédé de transmission du signal synchrone de l'UE D2D selon le type de signal synchrone en cours. La solution technique de la présente invention aborde le problème du procédé transmission du signal synchrone D2D (D2DSS) sans faire de distinction entre la découverte et la communication D2D, de telle sorte que lorsque le type de signal synchrone est distingué, le procédé de transmission du signal synchrone de l'UE D2D peut être déterminé selon le type de signal synchrone.
PCT/CN2015/089668 2014-11-06 2015-09-15 Procédé et dispositif de traitement synchrone dans une communication d2d WO2016070682A1 (fr)

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CN108064435A (zh) * 2017-10-25 2018-05-22 北京小米移动软件有限公司 用于发送和接收同步信号的方法、装置、发射机和接收机

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WO2013172678A1 (fr) * 2012-05-16 2013-11-21 Samsung Electronics Co., Ltd. Procédé et appareil permettant d'effectuer une synchronisation dans un réseau dispositif à dispositif
WO2014035805A1 (fr) * 2012-08-29 2014-03-06 Alcatel Lucent Découverte de dispositif pour communication de dispositif à dispositif

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