WO2016019734A1 - D2d的通信方法及装置 - Google Patents
D2d的通信方法及装置 Download PDFInfo
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- WO2016019734A1 WO2016019734A1 PCT/CN2015/075418 CN2015075418W WO2016019734A1 WO 2016019734 A1 WO2016019734 A1 WO 2016019734A1 CN 2015075418 W CN2015075418 W CN 2015075418W WO 2016019734 A1 WO2016019734 A1 WO 2016019734A1
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- synchronization signal
- resource
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0025—Synchronization between nodes synchronizing potentially movable access points
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/27—Transitions between radio resource control [RRC] states
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
Definitions
- the present invention relates to the field of communications, and in particular to a device-to-device (D2D) communication method and apparatus.
- D2D device-to-device
- FIG. 1a is a schematic diagram of cellular communication and D2D communication of a UE located in the same base station cell according to the related art.
- FIG. 1b is a schematic diagram of cellular communication and D2D communication of a UE located in the same base station cell according to the related art. As shown in FIG. 1b, D2D refers to that service data is not forwarded by the base station and the core network, and is directly transmitted by the source user equipment through the air interface.
- Proximity Service Proximity Service
- D2D For users of short-range communication, D2D not only saves wireless spectrum resources, but also reduces the data transmission pressure of the core network.
- 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.
- the D2D UE For the signal communication of the D2D UE in the same cell, it is natural to obtain the timing synchronization according to the downlink synchronization signal sent by the base station corresponding to the cell to which the cell belongs or related to the TA value, so as to implement the transmission of the D2D UE and the reception.
- Timing synchronization between D2D UEs For the signal communication of the D2D UE between cells, it is different depending on the situation. For the synchronous deployment network, the timing reference of different base stations is strictly synchronized.
- the D2D UEs between adjacent cells can also obtain timing synchronization according to the same method of the D2D UEs in the cell, and complete communication between different D2D UEs between adjacent cells.
- the timing references of different base stations are not strictly aligned.
- the D2D UEs belonging to the neighboring cells under different base stations cannot implement timing synchronization according to the synchronization signal or the TA value sent by the respective base stations.
- the embodiment of the invention provides a D2D communication method and device, so as to solve at least the problem that the D2D UEs belonging to neighboring cells under different base stations cannot achieve timing synchronization in the related art.
- a device-to-device D2D communication method comprising: a D2D terminal UE determining whether to transmit a D2D synchronization signal within a current D2D resource period; if yes, the D2D UE transmitting the D2D a synchronization signal; wherein the manner in which the D2D UE determines whether to transmit the D2D synchronization signal in the current D2D resource period includes at least one of the following: received indication signaling; a priority rule.
- determining, by the D2D UE, whether to send the D2D synchronization signal according to the indication signaling includes: if the indication signaling indicates a D2D resource period for sending the D2D synchronization signal, if the current D2D resource The period is a D2D resource period indicated by the indication signaling, and the UE sends the D2D synchronization signal.
- the indication signaling includes: a parameter used to indicate a D2D synchronization signal transmission period and/or a D2D synchronization signal transmission offset; and the D2D UE determines, according to the parameter, to send the D2D synchronization signal. D2D resource cycle.
- the indication signaling further includes: a parameter used to indicate a valid time of the content in the indication signaling; and the D2D UE updates the indication signaling according to the parameter of the valid time content.
- the D2D synchronization signal transmission period is N times the D2D resource period, and N is a positive integer; and/or the D2D synchronization signal transmission offset is the D2D where the D2D UE sends the D2D synchronization signal.
- the offset of the resource period in the D2D synchronization signal transmission period, and the D2D resource period as the offset granularity.
- the method further includes: the D2D synchronization signal sending offset may also be calculated by using an identifier of the D2D UE and a parameter indicating a sending period of the D2D synchronization signal.
- the indication signaling further includes: a parameter for indicating a location of the radio resource of the D2D UE to send the D2D signal; where the D2D UE sends the radio resource location corresponding to the parameter of the radio resource location D2D signal.
- determining, by the D2D UE, whether to send the D2D synchronization signal according to the indication signaling further includes: when the indication signaling indicates a reference signal received power RSRP threshold for transmitting the D2D synchronization signal, If the RSRP received by the current D2D UE satisfies the RSRP threshold, the UE sends the D2D synchronization signal.
- the indication signaling is included in a broadcast message; or the indication signaling is UE-specific signaling, which is included in dedicated RRC signaling or physical layer signaling.
- determining, by the D2D UE, whether to send the D2D synchronization signal according to the priority rule further includes: when the D2D UE needs to send a D2D signal, the D2D UE determines a resource used to send the D2D signal. a location; and, if the radio resource transmitting the D2D signal collides with a radio resource that transmits the D2D synchronization signal, the D2D UE is transmitting the D2D synchronization signal during a D2D resource period in which the D2D synchronization signal is transmitted.
- the D2D signal is not sent in the time domain resource; or if the radio resource that sends the D2D signal conflicts with the radio resource that sends the D2D synchronization signal, the D2D UE does not send the D2D resource period a D2D synchronization signal; or, if the radio resource that transmits the D2D signal collides with a radio resource that transmits the D2D synchronization signal, the D2D UE does not send the D2D in the D2D resource unit that includes the D2D synchronization signal time domain resource A signal, the D2D resource unit is a minimum resource for transmitting a D2D signal.
- determining, by the D2D UE, whether to send the D2D synchronization signal according to the priority rule further includes: when the UE needs to send a D2D signal, the UE determines a resource location for sending the D2D signal; And if the radio resource that sends the D2D signal conflicts with the radio resource used to send the D2D synchronization signal, the D2D signal is not sent within the conflicting radio resource.
- the method further includes: the base station selects a radio resource to control the RRC connection state of the D2D UE, and all or all of the UEs send the D2D synchronization signal; the base station sends the indication signaling according to the selection result.
- the method further includes: for the D2D UE that sends the D2D synchronization signal, the base station specifies, by using a semi-persistent scheduling manner, the radio resource that sends the D2D signal in the D2D resource period in the D2D resource period, and is in the time domain. Avoid radio resources used to transmit D2D sync signals.
- a device-to-device D2D communication method comprising: a current D2D terminal UE receiving a D2D synchronization signal from a neighboring cell D2D UE, wherein the current D2D UE is received according to the received
- the indication signaling determines whether a D2D synchronization signal is received within a current D2D resource period; the current D2D UE implements synchronization of D2D communication with the neighboring cell D2D UE according to the D2D synchronization signal.
- the method further includes: the current D2D UE does not receive the D2D signal in the resource that receives the D2D synchronization signal.
- a device-to-device D2D communication device which is located in a D2D terminal UE, and includes: a determining module, configured to determine whether to transmit a D2D synchronization signal in a current D2D resource period; and a sending module, The method is configured to: when the determination result of the determining module is yes, send the D2D synchronization signal; wherein, the manner in which the D2D UE determines whether to send a D2D synchronization signal in a current D2D resource period includes at least one of: receiving Indication signaling to; priority rule.
- the determining module is further configured to: if the indication signaling indicates a D2D resource period for sending the D2D synchronization signal, if the current D2D resource period is the D2D indicated by the indication signaling The resource period determines that the D2D synchronization signal is transmitted.
- the indication signaling includes: a parameter used to indicate a D2D synchronization signal transmission period and/or a D2D synchronization signal transmission offset; and the D2D UE determines, according to the parameter, to send the D2D synchronization signal. D2D resource cycle.
- the indication signaling further includes: a parameter used to indicate a valid time of the content in the indication signaling; and the D2D UE updates the indication signaling according to the parameter of the valid time content.
- the D2D synchronization signal transmission period is N times the D2D resource period, and N is a positive integer; and/or the D2D synchronization signal transmission offset is the D2D resource where the D2D UE sends the D2D synchronization signal.
- the offset of the period in the D2D synchronization signal transmission period is the offset granularity of the D2D resource period.
- the apparatus further includes: a calculating module, configured to calculate, by using an identifier number of the D2D UE and a parameter indicating a sending period of the D2D synchronization signal, the D2D synchronization signal transmission offset.
- a calculating module configured to calculate, by using an identifier number of the D2D UE and a parameter indicating a sending period of the D2D synchronization signal, the D2D synchronization signal transmission offset.
- the indication signaling further includes: a parameter for indicating a location of the radio resource of the D2D UE to send the D2D signal; where the D2D UE sends the radio resource location corresponding to the parameter of the radio resource location D2D signal.
- the determining module is further configured to: if the indication signaling indicates a reference signal receiving power RSRP threshold for transmitting the D2D synchronization signal, if the RSRP received by the current D2D UE satisfies the RSRP The threshold, the UE sends the D2D synchronization signal.
- the indication signaling is included in a broadcast message; or the indication signaling is UE-specific signaling, which is included in dedicated RRC signaling or physical layer signaling.
- the determining module is further configured to: when the D2D UE needs to send a D2D signal, determine a resource location for transmitting the D2D signal; and if the radio resource and the sending of the D2D signal are sent a radio resource conflict of the D2D synchronization signal, in the D2D resource period in which the D2D synchronization signal is transmitted, not transmitting the D2D signal in a time domain resource that sends the D2D synchronization signal; or, if the D2D signal is sent The radio resource does not transmit the D2D synchronization signal in the D2D resource period when the radio resource conflicts with the radio resource that sends the D2D synchronization signal; or if the radio resource of the D2D signal is sent and the D2D synchronization signal is sent If the radio resource conflicts, the D2D signal is not transmitted in the D2D resource unit that includes the D2D synchronization signal time domain resource, and the D2D resource unit is the minimum resource for transmitting the D2D signal.
- the determining module is further configured to: when the UE has a D2D signal to be transmitted, the UE determines a resource location for transmitting the D2D signal; and if the radio resource of the D2D signal is sent In conflict with the radio resource used to transmit the D2D synchronization signal, the D2D signal is not transmitted within the conflicting radio resource.
- a device-to-device D2D communication device which is located in a D2D terminal UE, and includes: a receiving module, configured to receive a D2D synchronization signal from a neighboring cell D2D UE, where The current D2D UE determines whether to receive the D2D synchronization signal in the current D2D resource period according to the received indication signaling; the synchronization module is configured to implement synchronization of the D2D communication with the neighboring cell D2D UE according to the D2D synchronization signal.
- the receiving module is further configured to not receive the D2D signal in the resource that receives the D2D synchronization signal.
- the D2D UE is used to determine whether to transmit the D2D synchronization signal in the current D2D resource period; if yes, the D2D UE sends the D2D synchronization signal; wherein the D2D UE determines whether it is in the current D2D resource period.
- the manner of transmitting the D2D synchronization signal includes at least one of the following: received.
- the D2D synchronization signal is transmitted for synchronization, and the D2D resource period for transmitting the D2D synchronization signal is considered, which provides a technical basis for reducing the influence of transmitting the D2D synchronization signal on the D2D communication.
- 1a is a schematic diagram 1 of cellular communication and D2D communication of a UE located in a same base station cell according to the related art
- 1b is a second schematic diagram of cellular communication and D2D communication of a UE located in the same base station cell according to the related art
- FIG. 2 is a flowchart of a D2D communication method according to an embodiment of the present invention.
- FIG. 3 is a block diagram showing the structure of a D2D communication apparatus according to an embodiment of the present invention.
- FIG. 4 is a schematic flow chart of a D2D signal communication method according to a preferred embodiment of the present invention.
- FIG. 5 is a schematic diagram of a radio resource structure in accordance with a preferred embodiment of the present invention.
- FIG. 6 is a schematic diagram of a cellular network deployment in accordance with a preferred embodiment of the present invention.
- FIG. 7a is a first schematic diagram of D2D synchronization signal transmission according to a preferred embodiment of the present invention.
- FIG. 7b is a second schematic diagram of D2D synchronization signal transmission according to a preferred embodiment of the present invention.
- FIG. 8 is a schematic diagram of D2D synchronization signal transmission according to a preferred embodiment 2 of the present invention.
- FIG. 9 is a first schematic diagram of D2D synchronization signal transmission according to a preferred embodiment 3 of the present invention.
- FIG. 10 is a schematic diagram 2 of D2D synchronization signal transmission according to a preferred embodiment 3 of the present invention.
- FIG. 11 is a third schematic diagram of D2D synchronization signal transmission according to a preferred embodiment 3 of the present invention.
- FIG. 12 is a flowchart of another D2D communication method according to an embodiment of the present invention.
- FIG. 13 is a block diagram showing the structure of another D2D communication apparatus according to an embodiment of the present invention.
- the D2D UE may obtain the neighboring D2D signal transmission timing by detecting the synchronization signal sent by the neighboring cell D2D UE, but the synchronization signal sent by the D2D UE may cause the D2D signal and the cellular signal transmission. Impact, choose different UEs to send synchronization signals or use different transmission methods, the degree of this impact will be different.
- This embodiment proposes a solution to the above problem, achieving synchronization of D2D communication between cells while minimizing the impact on D2D signals and cellular signal transmission.
- FIG. 2 is a flowchart of a D2D communication method according to an embodiment of the present invention. As shown in FIG. 2, the method includes the following steps:
- Step S202 The D2D terminal (User Equipment, UE for short) determines whether to send the D2D synchronization signal in the current D2D resource period.
- the D2D terminal User Equipment, UE for short
- Step S204 if yes, the D2D UE sends the D2D synchronization signal
- the manner in which the D2D UE determines whether to send a D2D synchronization signal in a current D2D resource period includes at least one of the following:
- the D2D UE determines whether to send the D2D synchronization signal in the current D2D resource period, and then sends the D2D synchronization signal in the case that the D2D synchronization signal is sent in the current D2D resource period, thereby solving the related art.
- the D2D UEs of the neighboring cells in different base stations cannot implement the timing synchronization problem, and the D2D UEs that are adjacent to the neighboring cells of different base stations are configured to transmit the D2D synchronization signal during the D2D resource period in which the D2D synchronization signal is transmitted, and The D2D resource period for transmitting the D2D synchronization signal is considered, which provides a technical basis for reducing the influence of transmitting the D2D synchronization signal on the D2D communication.
- the received indication signaling and/or priority rule may be used to enable the D2D UE to simultaneously transmit the D2D synchronization signal and the D2D signal on the same resource, so that the D2D synchronization can be avoided. Signals have an impact on D2D communication.
- determining, by the D2D UE, whether the D2D synchronization signal is sent according to the indication signaling may include:
- the UE may send the D2D synchronization. signal.
- the indication signaling may include: a parameter used to indicate a D2D synchronization signal transmission period and/or a D2D synchronization signal transmission offset; and the D2D UE determines, according to the parameter, to send the D2D.
- the D2D resource period of the sync signal may include: a parameter used to indicate a D2D synchronization signal transmission period and/or a D2D synchronization signal transmission offset; and the D2D UE determines, according to the parameter, to send the D2D.
- the D2D resource period of the sync signal may include: a parameter used to indicate a D2D synchronization signal transmission period and/or a D2D synchronization signal transmission offset
- the indication signaling may further include: a parameter for indicating a valid time of the content in the indication signaling; the D2D UE updating the content in the indication signaling according to the parameter of the valid time .
- the content in the indication signaling may include, for example, a parameter for indicating a D2D synchronization signal transmission period and/or a D2D synchronization signal transmission offset, and the like.
- the D2D synchronization signal transmission period may be N times the D2D resource period, and N is a positive integer; and/or the D2D synchronization signal transmission offset may be a D2D resource period in which the D2D UE sends the D2D synchronization signal.
- the offset in the D2D synchronization signal transmission period is described by the D2D resource period as the offset granularity.
- the D2D synchronization signal transmission offset may be calculated by using an identifier number of the D2D UE and a parameter indicating a transmission period of the D2D synchronization signal.
- the D2D UEs may be divided into different groups according to the result value of the modulo operation of the D2D UE.
- the indication signaling may further include: a parameter for instructing the D2D UE to send a radio resource location of the D2D signal; and a radio resource corresponding to the parameter of the D2D UE in the radio resource location The location transmits a D2D signal to avoid collision with the D2D sync signal.
- the indication signaling indicates a reference signal receiving power (RSRP) threshold for transmitting the D2D synchronization signal
- RSRP reference signal receiving power
- the indication signaling may be included in a broadcast message; or the indication signaling may be UE-specific signaling, including in dedicated RRC signaling or physical layer signaling.
- determining, by the D2D UE, whether to send the D2D synchronization signal according to the priority rule may include:
- the D2D UE determines a resource location for transmitting the D2D signal.
- the D2D UE is in the time domain resource that sends the D2D synchronization signal during the D2D resource period in which the D2D synchronization signal is sent. Not transmitting the D2D signal;
- the D2D UE does not send the D2D synchronization signal in the D2D resource period
- the D2D UE does not send a D2D signal in a D2D resource unit that includes the D2D synchronization signal time domain resource
- the D2D resource unit is the smallest resource for transmitting D2D signals.
- the minimum unit of the D2D resource unit in the time domain is a subframe, that is, only the D2D signal is not transmitted on the subframe where the D2D synchronization signal is located.
- the UE determines a resource location for transmitting the D2D signal; and if the radio resource of the D2D signal is sent and the D2D synchronization signal is sent If the radio resources collide, the D2D signal is not transmitted within the conflicting radio resources.
- the foregoing radio resources may include time domain resources and frequency domain resources.
- the foregoing conflict may be a radio resource that selectively transmits a D2D synchronization signal or transmits a D2D signal, and overlaps with a radio resource that itself or other D2D UE may transmit a D2D synchronization signal or transmit a D2D signal.
- the D2D UE described in the above is mainly a D2D UE in an idle (IDLE) state.
- the D2D UE receives an indication of the base station. Signaling, and determining whether to allow transmission of the D2D synchronization signal according to the indication signaling.
- RRC Radio Resource Control
- the base station Before the D2D UE determines whether to send the D2D synchronization signal according to the indication signaling, the base station selects a part or all of the D2D UEs of the radio resource control RRC connected state to send a D2D synchronization signal, and the base station sends the D2D synchronization signal according to the selection result. Indication signaling.
- the signaling may include at least one of the following: RRC dedicated signaling, where the RRC dedicated signaling may include adding information and adding RRC signaling in the existing RRC signaling; and adding downlink control information (Downlink Control) Information, referred to as DCI), the wireless network temporary identifier of the newly added DCI (Radio Network) Tempory Identity (referred to as RNTI) can correspond to D2D synchronization signals.
- the content indicated by the signaling may include whether the D2D UE transmits a D2D synchronization signal, and/or a period of transmitting a D2D synchronization signal, and/or an offset of transmitting a D2D synchronization signal, and/or an effective time for transmitting a D2D synchronization signal. .
- the base station may also select a D2D UE that sends the D2D synchronization signal in a scheduling manner.
- the base station may sequentially select one or more UEs of the RRC connected state D2D UE to send a D2D synchronization signal according to a polling manner; or, the base station may also use a channel quality indicator (Channel Quality Indicator) for the cellular uplink.
- the D2D UE that sends the D2D synchronization signal is selected for the value of the CQI) and/or the Modulation and Coding Scheme (MCS); or the base station may also measure the uplink corresponding to the D2D UE of the RRC connected state.
- the path loss is selected, and the UE transmitting the D2D synchronization signal is selected according to the value of the corresponding uplink path loss.
- the base station may specify, by using the semi-persistent scheduling manner, the radio resource that sends the D2D signal in the D2D resource period in the D2D UE period, and avoid the time domain to avoid A radio resource that transmits a D2D sync signal.
- the base station may also specify the radio resource for transmitting the D2D signal in the D2D resource period by using the D2D UE in a semi-persistent scheduling manner, and enable the radio resource that sends the D2D signal to be in the time domain.
- the D2D signal is not transmitted on the time domain resource that conflicts between the transmission D2D signal and the transmission D2D synchronization signal; and/or In the D2D resource period in which the D2D UE does not transmit the D2D synchronization signal, if the radio resource that transmits the D2D signal conflicts with the time domain and/or frequency domain resources used to transmit the D2D synchronization signal, then in the conflict time domain and / or D2D signal is not sent on the frequency domain resource.
- a D2D communication device is also provided, which is located in the D2D UE.
- the device is configured to implement the above-mentioned embodiments and preferred embodiments, and the description thereof has been omitted.
- 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. 3 is a structural block diagram of a D2D communication apparatus according to an embodiment of the present invention. As shown in FIG. 3, the apparatus includes a determination module 32 and a transmission module 34. The following describes each module in detail:
- the determining module 32 is configured to determine whether to send the D2D synchronization signal in the current D2D resource period; the sending module 34 is connected to the determining module 32, and is configured to send the D2D if the determining result of the determining module 32 is yes. a synchronization signal; wherein the manner in which the D2D UE determines whether to transmit the D2D synchronization signal in the current D2D resource period includes at least one of the following: received indication signaling; a priority rule.
- the determining module 32 may be further configured to: if the indication signaling indicates a D2D resource period for transmitting the D2D synchronization signal, if the current D2D resource period is the D2D indicated by the indication signaling The resource period determines that the D2D synchronization signal is transmitted.
- the indication signaling may include: a parameter for indicating a D2D synchronization signal transmission period and/or a D2D synchronization signal transmission offset; the D2D UE determining, according to the parameter, a method for transmitting the D2D synchronization signal. D2D resource cycle.
- the indication signaling may further include: a parameter for indicating a valid time of the content in the indication signaling; the D2D UE updating the content in the indication signaling according to the parameter of the valid time .
- the D2D synchronization signal transmission period is N times a D2D resource period, and N is a positive integer; and/or the D2D synchronization signal transmission offset is a D2D resource period in which the D2D UE transmits a D2D synchronization signal.
- the D2D synchronization signal transmits an offset within a period, and the D2D resource period is an offset granularity.
- the device further includes: a calculation module, connected to the determining module 32, configured to calculate the D2D synchronization signal transmission offset by using an identifier number of the D2D UE and a parameter indicating the D2D synchronization signal transmission period.
- a calculation module connected to the determining module 32, configured to calculate the D2D synchronization signal transmission offset by using an identifier number of the D2D UE and a parameter indicating the D2D synchronization signal transmission period.
- the indication signaling may further include: a parameter for instructing the D2D UE to send a radio resource location of the D2D signal; and the D2D UE sending the D2D in a radio resource location corresponding to the parameter of the radio resource location. signal.
- the determining module 32 is further configured to: if the indication signaling indicates a reference signal received power RSRP threshold for transmitting the D2D synchronization signal, if the RSRP received by the current D2D UE satisfies the RSRP The threshold, the UE sends the D2D synchronization signal.
- the indication signaling may be included in a broadcast message; or the indication signaling may be UE-specific signaling, including in dedicated RRC signaling or physical layer signaling.
- the determining module 32 is further configured to: when the D2D UE needs to transmit a D2D signal, determine a resource location for transmitting the D2D signal; and if the radio resource and the sending of the D2D signal are sent a radio resource conflict of the D2D synchronization signal, in the D2D resource period in which the D2D synchronization signal is transmitted, not transmitting the D2D signal in a time domain resource that sends the D2D synchronization signal; or, if the D2D signal is sent The radio resource does not transmit the D2D synchronization signal in the D2D resource period when the radio resource conflicts with the radio resource that sends the D2D synchronization signal; or if the radio resource of the D2D signal is sent and the D2D synchronization signal is sent Radio resource conflict, when the D2D synchronization signal is included The D2D signal is not transmitted within the D2D resource unit of the resource, and the D2D resource unit is the smallest resource for transmitting the D2D signal
- the determining module 32 may be further configured to: when the UE has a D2D signal to be transmitted, the UE determines a resource location for transmitting the D2D signal; and if the radio resource of the D2D signal is sent In conflict with the radio resource used to transmit the D2D synchronization signal, the D2D signal is not transmitted within the conflicting radio resource.
- FIG. 12 is a flowchart of another D2D communication method according to an embodiment of the present invention. As shown in FIG. 12, the method includes the following steps:
- Step S1202 The current D2D terminal UE receives the D2D synchronization signal from the neighboring cell D2D UE, where the current D2D UE determines, according to the received indication signaling, whether to receive the D2D synchronization signal in the current D2D resource period.
- Step S1204 The current D2D UE implements synchronization with D2D communication of the neighboring cell D2D UE according to the D2D synchronization signal.
- the current D2D UE may not receive the D2D signal within the resource that receives the D2D synchronization signal.
- FIG. 13 is a structure of another D2D communication device according to an embodiment of the present invention.
- the block diagram, as shown in Figure 13, includes:
- the receiving module 132 is configured to receive a D2D synchronization signal from the neighboring cell D2D UE, where the current D2D UE determines, according to the received indication signaling, whether to receive the D2D synchronization signal in the current D2D resource period; the synchronization module 134, and The receiving module 132 is connected to be configured to implement synchronization of D2D communication with the neighboring cell D2D UE according to the D2D synchronization signal.
- the receiving module 132 may be further configured to not receive the D2D signal within the resource that receives the D2D synchronization signal.
- the timing is not Alignment can cause the UE to not correctly receive D2D signals from neighboring cells.
- the UE To correctly receive the D2D signal of the neighboring UE, the UE must first know the reference timing of the signal sent by the neighboring UE and the resource allocation information of the neighboring D2D UE.
- the following preferred embodiments provide a device-to-device signal communication method, which solves the problem of synchronization of D2D communication between adjacent cells of different base stations in an asynchronous network deployment.
- the method includes: the neighboring area D2D UE sends the synchronization signal according to a predetermined criterion or signaling indication, and the D2D UE acquires the transmission timing of the neighboring area D2D signal by using the synchronization signal sent by the neighboring area D2D UE, and combines the neighboring area D2D resource allocation information to implement the neighboring neighbor.
- the reception of the zone D2D signal includes: the neighboring area D2D UE sends the synchronization signal according to a predetermined criterion or signaling indication, and the D2D UE acquires the transmission timing of the neighboring area D2D signal by using the synchronization signal sent by the neighboring area D2D UE, and combines the neighboring area D2D resource allocation information to implement the neighboring neighbor.
- the cell to which the D2D UE belongs is a reference cell
- the neighboring cell is a neighboring cell that is not in the same eNB as the reference cell
- the neighboring D2D UE determines whether to send a synchronization signal according to a predefined criterion or signaling indication.
- the D2D UE determines the transmission timing of the neighboring area D2D signal by detecting the synchronization signal sent by the neighboring area D2D UE, and determines the starting position of the neighboring area D2D resource period according to the transmission timing of the neighboring area D2D signal.
- the D2D UE receives the neighboring D2D signal in the corresponding D2D resource period.
- the D2D signal communication method provided by the preferred embodiment is described in detail below:
- the device-to-device communication method can be used for D2D signal communication between cells, including:
- Step S402 the D2D UE determines the receiving timing of the corresponding neighboring area D2D signal by detecting the D2D synchronization signal sent by the neighboring area D2D UE.
- Step S404 the D2D UE acquires configuration information of the neighboring area D2D resource.
- Step S406 the D2D UE receives the neighboring D2D signal according to the determined D2D signal receiving timing and resource configuration information, and solves the D2D signal content.
- the D2D synchronization signal sent by the neighboring area D2D UE includes a D2D Synchronization Signal (PD2DSS) and a D2D Synchronization Signal (SD2DSS).
- the neighboring area D2D UE transmits a D2D synchronization signal in a fixed time domain and frequency domain radio resource in a D2D resource period.
- the D2D resource period refers to a period of resources dedicated to D2D communication delineated in a cellular communication resource.
- the D2D synchronization signal sent by the neighboring D2D UE includes all D2D UEs or part of D2D UEs to send D2D synchronization signals.
- the D2D UE or part of the D2D UE determines whether to transmit the D2D synchronization signal by using the received indication signaling or priority rule.
- the D2D synchronization signal transmission period is N times the D2D resource period, and N is a positive integer.
- the D2D synchronization signal transmission offset is an offset of the D2D resource period in which the D2D synchronization signal is transmitted by the D2D UE in the D2D synchronization signal transmission period, and the D2D resource period is an offset granularity.
- the D2D UE in the cell transmits the D2D synchronization signal according to the D2D synchronization signal transmission period and the D2D synchronization signal transmission offset, and each D2D UE has an opportunity to transmit the D2D synchronization signal once in each D2D synchronization signal transmission period.
- the description of the D2D synchronization signal transmission offset is as follows: the D2D resource period corresponding to the D2D synchronization signal transmission period is N times, and the D2D UE can be mapped to different groups according to the result value of the D2D UE identification number to the N modulo operation.
- the different groups of D2D UEs respectively correspond to different D2D synchronization signal transmission offsets, and the transmission offsets may be calculated according to the UE identifier, the current radio frame number, the number of radio frames included in the D2D resource period, and N.
- the identification number of the D2D UE may uniquely identify the UE, which is different from other UEs.
- the resource for transmitting the D2D synchronization signal and the resource for transmitting the D2D signal in the D2D resource period are processed according to a predetermined criterion, including: in the D2D resource period for transmitting the D2D synchronization signal, for transmitting the D2D synchronization signal resource for the same D2D UE.
- the D2D signal cannot be sent within the time domain resource.
- the D2D UE is in the D2D resource period for transmitting the D2D synchronization signal, and the D2D UE is The resources for transmitting the D2D signal are randomly selected on all the time domain resources in the D2D resource period. If the resource for transmitting the D2D signal and the resource for transmitting the D2D synchronization signal collide in the time domain, the time domain resource for transmitting the D2D synchronization signal is selected. Sending a D2D signal, the D2D UE cancels the D2D synchronization signal transmission in the D2D resource period.
- the D2D UE is in the D2D resource period for transmitting the D2D synchronization signal, and the D2D UE is The resources for transmitting the D2D signal are randomly selected on all the time domain resources in the D2D resource period. If the resource for transmitting the D2D signal and the resource for transmitting the D2D synchronization signal collide in the time domain, the time domain resource for transmitting the D2D synchronization signal is selected. When the D2D signal is transmitted, the D2D UE does not transmit the D2D signal on the time domain resource that conflicts between the transmission of the D2D signal and the transmission of the D2D synchronization signal.
- the resource for transmitting the D2D synchronization signal and the resource for transmitting the D2D signal in the D2D resource period are processed according to a predetermined criterion, and further include: in the D2D resource period for transmitting the D2D synchronization signal, for the same
- the D2D UE selects to transmit the D2D signal on the time domain resource including the D2D synchronization signal, and the D2D UE does not transmit the D2D signal on the time domain resource that transmits the D2D signal and the D2D synchronization signal.
- the D2D UE selects a resource for transmitting the D2D signal among all the time domain resources in the D2D resource period, if the D2D is transmitted.
- the radio resources of the signal collide with the time domain and/or frequency domain resources used to transmit the D2D synchronization signal, and the D2D signal is not transmitted on the conflicting time domain and/or frequency domain resources.
- the determining, by the received indication signaling, whether to send a D2D synchronization signal includes: for a RRC (Radio Resource Control, RRC for short) connection state D2D UE, the base station may indicate the RRC connection by using UE dedicated signaling.
- the D2D UE of the RRC connected state determines whether to transmit a D2D synchronization signal according to the content indicated by the UE dedicated signaling, and/or a period of transmitting the D2D synchronization signal, and/or transmitting an offset of the D2D synchronization signal.
- the D2D UE transmits a D2D synchronization signal in a fixed time domain and frequency domain resource in a D2D resource period.
- the signaling includes: RRC dedicated signaling and new downlink control information (DCI), where the RRC dedicated signaling includes adding information and adding an RRC letter to the existing RRC signaling. make.
- the Radio Network Tempory Identity (RNTI) of the newly added downlink control information corresponds to the D2D synchronization signal.
- the content of the signaling indication includes whether the D2D UE transmits a D2D synchronization signal, and/or a period of transmitting a D2D synchronization signal, and/or an offset of transmitting a D2D synchronization signal, and/or an effective time of transmitting a D2D synchronization signal.
- the content of the signaling indication is determined by the base station according to a certain manner, including: the base station randomly selects a part of the D2D UE of the RRC connected state to send a D2D synchronization signal, or selects the D2D UE of the RRC connected state. All transmit D2D sync signals.
- the content of the signaling indication is determined by the base station according to a certain manner, and further includes: the base station selects, by using a scheduling manner, the D2D UE that sends the D2D synchronization signal.
- the scheduling manner includes: the base station sequentially selects one or a part of the UEs of the RRC connected state D2D UE to send a D2D synchronization signal according to a polling manner; or the base station according to a channel quality indication parameter CQI of the cellular uplink (Channel Quality)
- the D2D UE that transmits the D2D synchronization signal is selected by the value of the indicator or the modulation coding mode parameter MCS (Modulation and Coding Scheme).
- the method for scheduling includes: the base station measures an uplink path loss corresponding to the D2D UE in the RRC connected state, and selects a UE that transmits the D2D synchronization signal according to the corresponding uplink path loss value.
- the transmitting, by the D2D UE, the D2D synchronization signal and/or the transmitting the D2D signal includes: for the D2D UE transmitting the D2D synchronization signal, the base station specifies, by using a semi-persistent scheduling manner, that the D2D UE sends the D2D signal in the D2D resource period. Resources, and avoiding radio resources for transmitting D2D synchronization signals in the time domain.
- the transmitting, by the D2D UE, the D2D synchronization signal and/or the transmitting the D2D signal further includes: for the D2D UE that sends the D2D synchronization signal, the base station specifies, by using a semi-persistent scheduling manner, that the D2D UE sends the D2D signal in the D2D resource period. Wireless resources. And the radio resource that transmits the D2D signal includes a radio resource that transmits the D2D synchronization signal in the time domain.
- the D2D signal is not transmitted on the time domain resource where the transmitting D2D signal and the transmitting D2D synchronization signal collide.
- a radio resource that transmits a D2D signal collides with a time domain and/or a frequency domain resource for transmitting a D2D synchronization signal, then in a conflicting time domain and/or The D2D signal is not sent on the frequency domain resource.
- the D2D UE acquires configuration information of the neighboring area D2D resource, where the D2D UE obtains the system message sent by the base station to which the serving cell belongs.
- the base station obtains configuration information of the neighboring area D2D resource by means of a high-layer network configuration.
- Common cellular wireless communication systems can be based on CDMA (Code Division Multiplexing Access) technology, FDMA (Frequency Division Multiplexing Access), and OFDMA (Orthogonal Frequency-Frequency Multiple Access) technology.
- SC-FDMA Single Carrier-FDMA, single carrier frequency division multiple access
- LTE Long Term Evolution
- LTE-A Long Term Evolution-A
- FIG. 5 is a schematic diagram of a radio resource structure according to a preferred embodiment of the present invention.
- uplink and downlink communication resources are wireless in time direction.
- the radio frame is divided into units. Each radio frame has a length of 10 ms and contains 10 sub-frames of length 1 ms. Each sub-frame includes two slots with a length of 0.5 ms. Slot). Root According to the configuration of the Cyclic Prefix (CP), each time slot may include 6 or 7 OFDM or SC-FDM symbols.
- CP Cyclic Prefix
- 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). As shown in Figure 5.
- 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 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 when the UE has uplink data transmission, it is required to initiate random access (Random Access, RA for short) for uplink synchronization and establish an RRC (Radio Resource Control, RRC for short) connection, that is, from RRC idle (Idle).
- RRC Radio Resource Control
- 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.
- FIG. 6 is a schematic diagram of a cellular network deployment according to a preferred embodiment of the present invention. As shown in FIG. 6, it may be a 3GPP LTE/LTE-A system, or other cellular wireless communication technologies.
- 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. Or, in general, it can also be collectively referred to as an E-UTRAN (Evolved Universal Terrestrial Radio Access Network) in 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
- the base station provides a certain wireless signal coverage, and a terminal (such as a user equipment, User Equipment, UE, or device) within 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 receiving end acquires the transmission timing of the corresponding D2D signal to determine the receiving timing of the corresponding D2D signal.
- the receiving UE can determine the D2D receiving timing of the corresponding neighboring cell by detecting the D2D synchronization signal sent by the neighboring D2D UE.
- the receiving end UE can obtain configuration information of the neighboring area D2D resource from the base station to which the serving cell belongs. On this basis, the receiving end UE can determine the resource location of the received D2D signal to solve the content of the corresponding D2D signal.
- the D2D synchronization signal sent by the neighboring D2D UE There are various implementations for the D2D synchronization signal sent by the neighboring D2D UE.
- a simple way to implement a D2D UE to send a synchronization signal is equivalent to the received indication signaling, where N is 1 and the transmission offset is 0. That is, all D2D UEs in the cell send D2D synchronization signals by default, that is, D2D UEs transmit D2D synchronization signals on fixed resources in each D2D resource period. Moreover, all D2D UEs in the cell transmit D2D synchronization signals based on the same transmission timing assumption, and a combining gain can be formed on the receiving UE side.
- the synchronization timing between adjacent cells is strictly aligned, and the D2D resource regions of the neighboring cells are also aligned.
- the synchronization timing between adjacent cells is not aligned, and the D2D resource regions of the neighboring cells may be aligned or unaligned. Therefore, the D2D sync signal may interfere with the D2D signal or/and the cellular signal.
- the D2D UE may transmit the D2D synchronization signals in a manner of reducing the transmission power.
- Described based on D2D discovery in order to avoid collision between the D2D synchronization signal and the D2D discovery signal, when the D2D UE selects to transmit the D2D discovery signal on the resource including the D2D synchronization signal, all frequency domains of the SC-FDM symbol corresponding to the D2D synchronization signal are transmitted. Resources are not used to send D2D signals.
- 7a and 7b are respectively schematic diagrams 1 and 2 of D2D synchronization signal transmission according to a preferred embodiment of the present invention, and an example of the embodiment is shown in FIGS. 7a and 7b, wherein FIG. 7a corresponds to one SC-FDM symbol transmission D2D.
- FIG. 7b corresponds to 2 SC-FDM symbols to transmit D2D synchronization signals.
- the number of SC-FDM symbols for transmitting the D2D synchronization signal may be more than two, and the SC-FDM symbols for transmitting the D2D synchronization signal may be continuous or discrete.
- 701 and 705 are subframes for transmitting a D2D synchronization signal in a discovery resource period.
- the first subframe is taken as an example, 702 and 706 are resource locations of the D2D synchronization signal, and 702 corresponds to a time domain of 1 SC-
- the FDM symbol, 706 corresponds to the time domain of 2 SC-FDM symbols, and the frequency domain is the middle 6 RBs of the bandwidth.
- 704 and 708 are SC-FDM symbols in which the D2D synchronization signal is located, 704 corresponds to one SC-FDM symbol, and 708 corresponds to two SC-FDM symbols.
- 703 and 707 are resource locations of the discovery signal, and the discovery signal is not transmitted on the SC-FDM symbol corresponding to the D2D synchronization signal, 704 (the discovery signal is one of the D2D signals).
- the received indication signaling includes a parameter N and a transmission offset, and all D2D UEs in the cell transmit a D2D synchronization signal according to a D2D synchronization signal transmission period of the N times D2D resource period, where N is a positive integer, in each D2D synchronization signal transmission period.
- Each D2D UE sends a D2D synchronization signal.
- Each D2D UE transmits a D2D synchronization signal in a corresponding D2D resource period in a D2D synchronization signal transmission period according to the transmission offset, so that the D2D UE corresponding to different transmission offsets transmits the synchronization signal in different D2D resource periods.
- the synchronization signal is fixed in the first subframe transmission within the D2D resource period.
- the D2D UE may further calculate a transmission offset of the corresponding transmit D2D synchronization signal according to the parameter N in the received indication signaling and the parameters such as the UE identifier and the radio frame number.
- the D2D UE can be divided into N different groups according to the N, and the UE packet can be performed based on the UE identifier that can uniquely identify the UE, such as the IMSI (International Mobile Subscriber Identification Number) of the UE, or the ID assigned by the base station when scheduling the UE.
- mod is the modulo operation and / is the division operation
- SFN is the radio frame number index.
- the D2D UE may also implement D2D synchronization signal transmission according to the RSRP threshold parameter in the received indication signaling.
- different D2D synchronization signal transmission offsets of different UEs may be implemented in a grouping manner, for example, the RSRP threshold is divided into N groups, and N is a positive integer. Each group of thresholds corresponds to a group of UEs, and D2D UEs satisfying different thresholds are respectively assigned. To different groups.
- the RSRP threshold is sent by the base station to all D2D UEs through broadcast. For example, the decision threshold corresponding to the RSRP of the serving cell is divided into a threshold range 1 and a threshold range 2.
- the UE For a certain D2D UE, if the serving cell RSRP meets the threshold range 1, the UE is assigned to the first group, and if the threshold range 2 is met, the UE is assigned to the second group.
- Different groups of D2D UEs correspond to different D2D synchronization signal transmission periods and D2D synchronization signal transmission offsets.
- the D2D synchronization signal is transmitted in the first subframe of the D2D resource period.
- the D2D UE transmits the D2D signal (D2D discovery signal or D2D communication signal) on the first subframe, an overlap of the transmission resources occurs.
- the resource conflict between the D2D synchronization signal and the D2D signal transmission is as follows:
- the D2D synchronization signal is sent in preference to the D2D signal.
- the D2D signal is not transmitted on the subframe in which the D2D sync signal is transmitted.
- the D2D discovery selects the resource for transmitting the D2D discovery signal on other resources in the discovery resource period other than the first subframe.
- the D2D UE selects the resource for transmitting the D2D discovery signal in the entire discovery resource period.
- FIG. 9 is a first schematic diagram of D2D synchronization signal transmission according to a preferred embodiment 3 of the present invention. As shown in FIG. 9, 901 corresponds to a resource location of a D2D synchronization signal.
- the D2D signal is sent in preference to the D2D synchronization signal.
- the D2D resource period in which the D2D synchronization signal is transmitted if the D2D UE selects the resource of the first subframe to transmit the D2D signal, then in the D2D resource period, the D2D synchronization signal is discarded, and at the same time, the resource for transmitting the D2D signal is
- the resources transmitting the synchronization signal have conflicting time domain and frequency domain resources, and do not transmit D2D signals. That is, in the SC-FDM symbol corresponding to the D2D synchronization signal, the D2D signal is not transmitted on the frequency domain resource that transmits the D2D synchronization signal.
- the D2D UEs can be divided into three groups, and 1001, 1002, and 1003 respectively transmit D2D synchronization signals corresponding to the first group, the second group, and the third group of D2D UEs, and the resources for transmitting the D2D synchronization signals are fixed as Discover the first subframe of the resource period.
- the D2D synchronization signal is sent by the first group of D2D UEs in the discovery resource period, but since the discovery signal is to be sent in the first subframe, Send a D2D sync signal.
- the data of the discovery signal is not mapped at the resource location of the corresponding D2D synchronization signal corresponding to 1004 to avoid mutual interference with the D2D synchronization signals transmitted by other UEs in the first group of D2D UEs.
- Mode 3 The D2D signal and the synchronization signal are sent in a centralized manner.
- the resource period in which the D2D synchronization signal is transmitted when the D2D UE selects the resource for transmitting the D2D signal, the resource of the D2D signal is actively selected in the first subframe in the D2D resource period, and the D2D synchronization signal is correspondingly transmitted in the first subframe.
- the data of the D2D signal is not mapped on the SC-FDM symbol.
- the resource for transmitting the D2D signal is selected in the entire D2D resource period.
- the D2D signal When choosing to send a D2D signal When the resource conflicts with the resource that sends the synchronization signal, the D2D signal is not transmitted on the conflicting resource. That is, in the SC-FDM symbol corresponding to the D2D synchronization signal, the D2D signal is not transmitted on the frequency domain resource that transmits the D2D synchronization signal.
- FIG. 11 is a schematic diagram 3 of D2D synchronization signal transmission according to a preferred embodiment 3 of the present invention.
- 1100 and 1103 are the first subframe in the discovery resource period, for a certain one.
- the D2D UE, 1100 transmits a D2D synchronization signal, and 1103 does not transmit a D2D synchronization signal.
- 1102 and 1104 correspond to discovery signal resources.
- the D2D UE selects to transmit in the same subframe as the D2D synchronization signal.
- 1101 is the SC-FDM symbol where the D2D synchronization signal is located, and the data of the discovery signal is not mapped on the entire symbol where the D2D synchronization signal is located.
- the data of the discovery signal can be mapped on the frequency domain resource other than the frequency domain resource of the D2D synchronization signal in the SC-FDM symbol corresponding to the D2D synchronization signal resource position.
- the UE may select which UEs to send the D2D synchronization signal, and indicate the D2D UE by signaling.
- the base station may be determined by random selection transmission D2D synchronization signal the UE, such as the connected state from the RRC D2D UE randomly selects a D2D the UE, such as UE 1, transmits D2D synchronization signal, after a period of time, such as 10ms, 20ms, 50ms...etc., then select another D2D UE, such as UE 2 , to send a D2D synchronization signal.
- the base station may also select RRC connected state D2D UE the part of the UE transmits D2D synchronization signal, such as selecting UE 1, UE 2, ..., UE i transmits D2D synchronization signal, where i is less than K, K is the cell in RRC connected state D2D The number of UEs.
- the base station may also select different D2D UEs to transmit D2D synchronization signals according to different transmission periods. For example, UE 1 , UE 2 , . . . , UE i transmits a D2D synchronization signal according to a transmission period N1, selects UE i+1 , UE i+2 , . . . , UE i+j transmits a D2D synchronization signal according to a transmission period N2.
- i+j is smaller than the number K of RRC connected state D2D UEs in the cell.
- the base station can also select the D2D UE that sends the D2D synchronization signal by scheduling, according to the following methods:
- Method 1 sequentially select one D2D UE to send a D2D synchronization signal by means of polling, or divide the RRC connected state D2D UE into three groups according to the UE ID, and select different groups of D2D UEs in the order of 1 ⁇ 2 ⁇ 3 ⁇ 1. Send D2D sync signals separately.
- Manner 2 According to the CQI of the cellular uplink, and/or the MCS of the uplink data, select N D2D UEs with larger CQI and/or MCS to send D2D synchronization signals, for example, take N as 2, 4, 8, 16, etc. .
- N D2D UEs with large path loss are selected to transmit the D2D synchronization signal, for example, N is 2, 4, 8, 16, .
- the base station specifies a dedicated resource for the RRC connected state D2D UE in a semi-static manner, and is configured to transmit a D2D signal.
- a dedicated resource for a D2D UE that transmits a D2D synchronization signal, when a base station allocates a dedicated resource, it avoids a subframe in which a D2D synchronization signal is transmitted, such as a first subframe in a D2D resource period.
- the base station may indicate the D2D UE by using RRC dedicated signaling, and indicate that the signaling indicates the indicated content through the bit string, including whether to transmit the D2D synchronization signal, the transmission period, and the effective time of transmitting the synchronization signal.
- it is represented by 16 bits, where 1 bit indicates whether to transmit a D2D synchronization signal, 7 bit indicates a transmission period, and a D2D resource period is used as a unit, and a maximum transmission period of 128 times D2D resource period can be supported, and 8 bits indicates an effective time for transmitting a synchronization signal. It can support up to 256 times the effective time of D2D resource period.
- the information indicating whether the base station indicates whether to transmit the D2D synchronization signal may also be indicated in the same signaling as the information indicating the D2D dedicated resource, and the validity period of the transmission synchronization signal may be consistent with the validity period of the D2D dedicated resource allocation.
- the base station may also indicate the D2D synchronization signal transmission information by adding a DCI format, and the RNTI of the DCI is newly added to the D2D synchronization signal, and the DCI content includes whether to transmit the D2D synchronization signal, the transmission period, and the effective time of transmitting the synchronization signal.
- a storage medium in which the above software is stored, including but not limited to an optical disk, a floppy disk, a hard disk, an erasable memory, and the like.
- 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 D2D communication method and apparatus have the following beneficial effects: the problem that the D2D UEs belonging to neighboring cells under different base stations cannot achieve timing synchronization in the related art is solved, and the implementation of the membership is achieved. Determining D2D for transmitting D2D synchronization signals between D2D UEs of neighboring cells under different base stations During the resource period, the D2D synchronization signal is transmitted for synchronization, and the D2D resource period for transmitting the D2D synchronization signal is considered, providing a technical basis for reducing the influence of transmitting the D2D synchronization signal on the D2D communication.
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Abstract
本发明公开了一种D2D的通信方法及装置,其中,该方法包括:D2D UE确定是否在当前D2D资源周期内发送D2D同步信号;如果是,则所述D2D UE发送所述D2D同步信号;其中,所述D2D UE确定是否在当前D2D资源周期内发送D2D同步信号的方式包括以下至少之一:接收到的指示信令;优先级规则。通过本发明,解决了相关技术中隶属不同基站下相邻小区的D2D UE无法实现定时同步的问题,实现了隶属不同基站下相邻小区的D2D UE之间在确定发送D2D同步信号的D2D资源周期内,发送D2D同步信号进行同步。
Description
本发明涉及通信领域,具体而言,涉及一种设备到设备(Device-to-Device,简称为D2D)的通信方法及装置。
在蜂窝通信***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,或者称为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。图1a是根据相关技术的位于同一基站小区的UE的蜂窝通信和D2D通信示意图一,如图1a所示,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***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。图1b是根据相关技术的位于同一基站小区的UE的蜂窝通信和D2D通信示意图二,如图1b所示,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。
在蜂窝通信中,基站与UE进行数据通信的前提是实现二者在时间上的定时同步,UE通过检测基站发送的下行同步信号,包括主同步信号(Primary Synchronous Signal,简称为PSS)和辅同步信号(Secondary Synchronous Signal,简称为SSS),来实现与基站的下行定时同步;通过补偿定时提前(Timing Advance,简称为TA)来实现与基站的上行定时同步。
同样,在D2D通信***中,D2D信号发送UE和接收UE之间也需要实现定时同步,才有可能正确地接收和解调D2D信号。对于在同一个小区内的D2D UE的信号通信,很自然地,可以根据所属小区对应的基站发送的下行同步信号或结合TA值进行相关的补偿,来获得定时同步,以实现发送D2D UE和接收D2D UE之间的定时同步。而对于小区间的D2D UE的信号通信,就要分情况而不同了。对于同步部署网络,不同基站的定时参考为严格同步的,因此,相邻小区间D2D UE,也可以按照小区内D2D UE相同的方法获得定时同步,完成相邻小区之间不同D2D UE之间通信。但是对于非同步部署的网络,不同基站的定时参考并不是严格对齐。此时,隶属不同基站下相邻小区的D2D UE,根据各自所属基站下发的同步信号或TA值并不能实现定时同步。
针对相关技术中隶属不同基站下相邻小区的D2D UE无法实现定时同步的问题,目前尚未提出有效的解决方案。
发明内容
本发明实施例提供了一种D2D的通信方法及装置,以至少解决相关技术中隶属不同基站下相邻小区的D2D UE无法实现定时同步的问题。
根据本发明的一个实施例,提供了一种设备到设备D2D的通信方法,包括:D2D终端UE确定是否在当前D2D资源周期内发送D2D同步信号;如果是,则所述D2D UE发送所述D2D同步信号;其中,所述D2D UE确定是否在当前D2D资源周期内发送D2D同步信号的方式包括以下至少之一:接收到的指示信令;优先级规则。
本实施例中,D2D UE根据所述指示信令确定是否发送所述D2D同步信号包括:在所述指示信令指示用于发送所述D2D同步信号的D2D资源周期的情况下,如果当前D2D资源周期是所述指示信令指示的D2D资源周期,则所述UE发送所述D2D同步信号。
本实施例中,所述指示信令中包括:用于指示D2D同步信号发送周期和/或D2D同步信号发送偏移的参数;所述D2D UE根据所述参数确定用于发送所述D2D同步信号的D2D资源周期。
本实施例中,所述指示信令中还包括:用于指示所述指示信令中的内容的有效时间的参数;所述D2D UE根据所述有效时间的参数更新所述指示信令中的内容。
本实施例中,所述D2D同步信号发送周期为N倍的D2D资源周期,N为正整数;和/或,所述D2D同步信号发送偏移为所述D2D UE发送D2D同步信号所在的D2D
资源周期在所述D2D同步信号发送周期内的偏移量,以所述D2D资源周期为偏移粒度。
本实施例中,还包括:所述D2D同步信号发送偏移还可以通过所述D2D UE的标识号和指示所述D2D同步信号发送周期的参数计算得到。
本实施例中,所述指示信令中还包括:用于指示所述D2D UE发送D2D信号的无线资源位置的参数;所述D2D UE在所述无线资源位置的参数所对应的无线资源位置发送D2D信号。
本实施例中,D2D UE根据所述指示信令确定是否发送所述D2D同步信号还包括:在所述指示信令指示用于发送所述D2D同步信号的参考信号接收功率RSRP门限的情况下,如果当前D2D UE接收的RSRP满足所述RSRP门限,则所述UE发送所述D2D同步信号。
本实施例中,所述指示信令包括在广播消息中;或者,所述指示信令为UE专用信令,包括在专用RRC信令或者物理层信令中。
本实施例中,D2D UE根据所述优先级规则确定是否发送所述D2D同步信号还包括:当所述D2D UE存在D2D信号需要发送时,所述D2D UE确定用于发送所述D2D信号的资源位置;以及,如果发送所述D2D信号的无线资源与发送所述D2D同步信号的无线资源冲突,在发送所述D2D同步信号的D2D资源周期内,所述D2D UE在发送所述D2D同步信号的时域资源内不发送所述D2D信号;或者,如果发送所述D2D信号的无线资源与发送所述D2D同步信号的无线资源冲突,则所述D2D UE在所述D2D资源周期内不发送所述D2D同步信号;或者,如果发送所述D2D信号的无线资源与发送所述D2D同步信号的无线资源冲突,则所述D2D UE在包含所述D2D同步信号时域资源的D2D资源单元内不发送D2D信号,所述D2D资源单元为发送D2D信号的最小资源。
本实施例中,D2D UE根据所述优先级规则确定是否发送所述D2D同步信号还包括:当所述UE存在D2D信号需要发送时,所述UE确定用于发送所述D2D信号的资源位置;以及,如果发送所述D2D信号的无线资源与用于发送所述D2D同步信号的无线资源相冲突,则在冲突的无线资源内不发送所述D2D信号。
本实施例中,还包括:基站选择无线资源控制RRC连接态的D2D UE的部分或者全部UE发送D2D同步信号;所述基站根据选择结果下发所述指示信令。
本实施例中,所述方法还包括:对于发送D2D同步信号的D2D UE,基站通过半静态调度的方式为所述D2D UE在D2D资源周期内指定发送D2D信号的无线资源,并且在时域上避开用于发送D2D同步信号的无线资源。
根据本发明的另一实施例,提供了一种设备到设备D2D的通信方法,包括:当前D2D终端UE接收来自相邻小区D2D UE的D2D同步信号,其中,所述当前D2D UE根据接收到的指示信令确定是否在当前D2D资源周期内接收D2D同步信号;所述当前D2D UE根据所述D2D同步信号实现与所述相邻小区D2D UE的D2D通信的同步。
本实施例中,所述方法还包括:所述当前D2D UE在接收D2D同步信号的资源内,不接收D2D信号。
根据本发明的再一实施例,提供了一种设备到设备D2D的通信装置,位于D2D终端UE中,包括:判断模块,设置为确定是否在当前D2D资源周期内发送D2D同步信号;发送模块,设置为在所述判断模块的判断结果为是的情况下,发送所述D2D同步信号;其中,所述D2D UE确定是否在当前D2D资源周期内发送D2D同步信号的方式包括以下至少之一:接收到的指示信令;优先级规则。
本实施例中,所述判断模块还设置为:在所述指示信令指示用于发送所述D2D同步信号的D2D资源周期的情况下,如果当前D2D资源周期是所述指示信令指示的D2D资源周期,则确定发送所述D2D同步信号。
本实施例中,所述指示信令中包括:用于指示D2D同步信号发送周期和/或D2D同步信号发送偏移的参数;所述D2D UE根据所述参数确定用于发送所述D2D同步信号的D2D资源周期。
本实施例中,所述指示信令中还包括:用于指示所述指示信令中的内容的有效时间的参数;所述D2D UE根据所述有效时间的参数更新所述指示信令中的内容。
本实施例中,所述D2D同步信号发送周期为N倍的D2D资源周期,N为正整数;和/或,所述D2D同步信号发送偏移为所述D2D UE发送D2D同步信号所在的D2D资源周期在所述D2D同步信号发送周期内的偏移量,以所述D2D资源周期为偏移粒度。
本实施例中,所述装置还包括:计算模块,设置为通过所述D2D UE的标识号和指示所述D2D同步信号发送周期的参数计算得到所述D2D同步信号发送偏移。
本实施例中,所述指示信令中还包括:用于指示所述D2D UE发送D2D信号的无线资源位置的参数;所述D2D UE在所述无线资源位置的参数所对应的无线资源位置发送D2D信号。
本实施例中,所述判断模块还设置为:在所述指示信令指示用于发送所述D2D同步信号的参考信号接收功率RSRP门限的情况下,如果当前D2D UE接收的RSRP满足所述RSRP门限,则所述UE发送所述D2D同步信号。
本实施例中,所述指示信令包括在广播消息中;或者,所述指示信令为UE专用信令,包括在专用RRC信令或者物理层信令中。
本实施例中,所述判断模块还设置为:当所述D2D UE存在D2D信号需要发送时,确定用于发送所述D2D信号的资源位置;以及,如果发送所述D2D信号的无线资源与发送所述D2D同步信号的无线资源冲突,在发送所述D2D同步信号的D2D资源周期内,在发送所述D2D同步信号的时域资源内不发送所述D2D信号;或者,如果发送所述D2D信号的无线资源与发送所述D2D同步信号的无线资源冲突,则在所述D2D资源周期内不发送所述D2D同步信号;或者,如果发送所述D2D信号的无线资源与发送所述D2D同步信号的无线资源冲突,则在包含所述D2D同步信号时域资源的D2D资源单元内不发送D2D信号,所述D2D资源单元为发送D2D信号的最小资源。
本实施例中,所述判断模块还设置为:当所述UE存在D2D信号需要发送时,所述UE确定用于发送所述D2D信号的资源位置;以及,如果发送所述D2D信号的无线资源与用于发送所述D2D同步信号的无线资源相冲突,则在冲突的无线资源内不发送所述D2D信号。
根据本发明的再一实施例,还提供了一种设备到设备D2D的通信装置,位于D2D终端UE中,包括:接收模块,设置为接收来自相邻小区D2D UE的D2D同步信号,其中,所述当前D2D UE根据接收到的指示信令确定是否在当前D2D资源周期内接收D2D同步信号;同步模块,设置为根据所述D2D同步信号实现与所述相邻小区D2D UE的D2D通信的同步。
本实施例中,所述接收模块还设置为:在接收D2D同步信号的资源内,不接收D2D信号。
通过本发明实施例,采用D2D UE确定是否在当前D2D资源周期内发送D2D同步信号;如果是,则所述D2D UE发送所述D2D同步信号;其中,所述D2D UE确定是否在当前D2D资源周期内发送D2D同步信号的方式包括以下至少之一:接收到的
指示信令;优先级规则的方式,解决了相关技术中隶属不同基站下相邻小区的D2D UE无法实现定时同步的问题,实现了隶属不同基站下相邻小区的D2D UE之间在确定发送D2D同步信号的D2D资源周期内,发送D2D同步信号进行同步,并且考虑了发送D2D同步信号的D2D资源周期,为减小发送D2D同步信号对D2D通信产生的影响提供了技术基础。
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1a是根据相关技术的位于同一基站小区的UE的蜂窝通信和D2D通信示意图一;
图1b是根据相关技术的位于同一基站小区的UE的蜂窝通信和D2D通信示意图二;
图2是根据本发明实施例的D2D的通信方法的流程图;
图3是根据本发明实施例的D2D的通信装置的结构框图;
图4是根据本发明优选实施例的D2D信号通信方法的流程示意图;
图5是根据本发明优选实施例的无线资源结构的示意图;
图6是根据本发明优选实施例的蜂窝网络部署示意图;
图7a是根据本发明优选实施例一的D2D同步信号发送的示意图一;
图7b是根据本发明优选实施例一的D2D同步信号发送的示意图二;
图8是根据本发明优选实施例二的D2D同步信号发送的示意图;
图9是根据本发明优选实施例三的D2D同步信号发送的示意图一;
图10是根据本发明优选实施例三的D2D同步信号发送示意图二;
图11是根据本发明优选实施例三的D2D同步信号发送的示意图三;
图12是根据本发明实施例的另一种D2D的通信方法的流程图;
图13是根据本发明实施例的另一种D2D的通信装置的结构框图。
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。
对于非同步部署网络小区间D2D通信同步,D2D UE可以通过检测邻小区D2D UE发送的同步信号获得邻区D2D信号发送定时,但D2D UE发送的同步信号对D2D信号和蜂窝信号的传输可能会造成影响,选择不同的UE发送同步信号或者采用不同的发送方式,这种影响的程度会不同。
本实施例针对上述问题提出一种解决方案,实现小区之间D2D通信的同步,同时尽可能地减小对于D2D信号和蜂窝信号传输的影响。
在本实施例中,提供了一种D2D的通信方法,图2是根据本发明实施例的D2D的通信方法的流程图,如图2所示,该方法包括如下步骤:
步骤S202,D2D终端(User Equipment,简称为UE)确定是否在当前D2D资源周期内发送D2D同步信号;
步骤S204,如果是,则所述D2D UE发送所述D2D同步信号;
其中,所述D2D UE确定是否在当前D2D资源周期内发送D2D同步信号的方式包括以下至少之一:
接收到的指示信令;优先级规则。
本实施例通过上述步骤,D2D UE确定是否在当前D2D资源周期内发送D2D同步信号,在确定是在当前D2D资源周期内发送D2D同步信号的情况下再发送D2D同步信号,解决了相关技术中隶属不同基站下相邻小区的D2D UE无法实现定时同步的问题,实现了隶属不同基站下相邻小区的D2D UE之间在确定发送D2D同步信号的D2D资源周期内,发送D2D同步信号进行同步,并且考虑了发送D2D同步信号的D2D资源周期,为减小发送D2D同步信号对D2D通信产生的影响提供了技术基础。
进一步地,在本实施例中,所述接收到的指示信令和/或优先级规则,可以用于使D2D UE不在相同资源上同时发送D2D同步信号与D2D信号,这样就能够避免发送D2D同步信号对D2D通信产生影响。
在本实施例中,D2D UE根据所述指示信令确定是否发送所述D2D同步信号可以包括:
在所述指示信令指示用于发送所述D2D同步信号的D2D资源周期的情况下,如果当前D2D资源周期是所述指示信令指示的D2D资源周期,则所述UE可以发送所述D2D同步信号。
在本实施例中,所述指示信令中可以包括:用于指示D2D同步信号发送周期和/或D2D同步信号发送偏移的参数;所述D2D UE根据所述参数确定用于发送所述D2D同步信号的D2D资源周期。
优选地,所述指示信令中还可以包括:用于指示所述指示信令中的内容的有效时间的参数;所述D2D UE根据所述有效时间的参数更新所述指示信令中的内容。其中,指示信令中的内容例如可以包括用于指示D2D同步信号发送周期和/或D2D同步信号发送偏移的参数等。
其中,所述D2D同步信号发送周期可以为N倍的D2D资源周期,N为正整数;和/或,所述D2D同步信号发送偏移可以为D2D UE发送D2D同步信号所在的D2D资源周期在所述D2D同步信号发送周期内的偏移量,以D2D资源周期为偏移粒度。
在本实施例中,所述D2D同步信号发送偏移可以通过所述D2D UE的标识号和指示所述D2D同步信号发送周期的参数计算得到。例如,可以根据所述D2D UE的标识号对N取模运算的结果值,将所述D2D UE分为不同组。
在本实施例中,所述指示信令中还可以包括:用于指示所述D2D UE发送D2D信号的无线资源位置的参数;所述D2D UE在所述无线资源位置的参数所对应的无线资源位置发送D2D信号,以避免与所述D2D同步信号冲突。
本实施例中,在所述指示信令指示用于发送所述D2D同步信号的参考信号接收功率(Reference Signal Receiving Power,简称为RSRP)门限的情况下,如果当前D2D UE接收的RSRP满足所述RSRP门限,则所述UE发送所述D2D同步信号。
在本实施例中,所述指示信令可以包括在广播消息中;或者,所述指示信令可以为UE专用信令,包括在专用RRC信令或者物理层信令中。
本实施例中,D2D UE根据所述优先级规则确定是否发送所述D2D同步信号可以包括:
当所述D2D UE存在D2D信号需要发送时,所述D2D UE确定用于发送所述D2D信号的资源位置;以及,
如果发送所述D2D信号的无线资源与发送所述D2D同步信号的无线资源冲突,在发送所述D2D同步信号的D2D资源周期内,所述D2D UE在发送所述D2D同步信号的时域资源内不发送所述D2D信号;
或者,如果发送所述D2D信号的无线资源与发送所述D2D同步信号的无线资源冲突,则所述D2D UE在所述D2D资源周期内不发送所述D2D同步信号;
或者,如果发送所述D2D信号的无线资源与发送所述D2D同步信号的无线资源冲突,则所述D2D UE在包含所述D2D同步信号时域资源的D2D资源单元内不发送D2D信号,所述D2D资源单元为发送D2D信号的最小资源。例如,D2D资源单元在时域的最小单位为子帧,即只是在D2D同步信号所在的子帧上不发D2D信号。
优选地,当所述UE存在D2D信号需要发送时,所述UE确定用于发送所述D2D信号的资源位置;以及,如果发送所述D2D信号的无线资源与用于发送所述D2D同步信号的无线资源相冲突,则在冲突的无线资源内不发送所述D2D信号。
其中,上述无线资源可以包括时域资源与频域资源。上述冲突可以为选择发送D2D同步信号或者发送D2D信号的无线资源,与自身或者其他D2D UE可能发送D2D同步信号或者发送D2D信号的无线资源相重叠。
上文中描述的D2D UE主要为空闲(IDLE)态的D2D UE,在本实施例中,对于无线资源控制(Radio Resource Control,简称为RRC)连接态的D2D UE,所述D2D UE接收基站的指示信令,并根据所述指示信令确定是否允许发送D2D同步信号。上述方案的基站侧描述具体如下:
在D2D UE根据所述指示信令确定是否发送所述D2D同步信号之前,基站选择无线资源控制RRC连接态的D2D UE的部分或者全部UE发送D2D同步信号;所述基站根据选择结果下发所述指示信令。
其中,所述信令可以包括以下至少之一:RRC专用信令,该RRC专用信令可以包括在现有RRC信令中增加信息和新增RRC信令;新增的下行控制信息(Downlink Control Information,简称为DCI),所述新增的DCI的无线网络临时标识(Radio Network
Tempory Identity,简称为RNTI)可以对应D2D同步信号。所述信令指示的内容可以包括所述D2D UE是否发送D2D同步信号,和/或发送D2D同步信号的周期,和/或发送D2D同步信号的偏移,和/或发送D2D同步信号的有效时间。
本实施例中,基站还可以通过调度的方式选择发送D2D同步信号的D2D UE。其中,基站可以根据轮询的方式依次选择所述RRC连接态D2D UE的一个或多个UE发送D2D同步信号;或者,基站也可以根据蜂窝上行链路的信道质量指示参数(Channel Quality Indicator,简称为CQI)和/或调制编码方式参数(Modulation and Coding Scheme,简称为MCS)的值,选择发送D2D同步信号的D2D UE;或者,基站还可以测量所述RRC连接态的D2D UE对应的上行链路路损,并根据对应的上行链路路损的值选择发送D2D同步信号的UE。
在本实施例中,对于发送D2D同步信号的D2D UE,基站可以通过半静态调度的方式为所述D2D UE在D2D资源周期内指定发送D2D信号的无线资源,并且在时域上避开用于发送D2D同步信号的无线资源。
或者,对于发送D2D同步信号的D2D UE,基站也可以通过半静态调度的方式为所述D2D UE在D2D资源周期内指定发送D2D信号的无线资源,并且使发送D2D信号的无线资源在时域上包含发送D2D同步信号的无线资源;其中,在所述D2D UE发送D2D同步信号的D2D资源周期内,在发送D2D信号与发送D2D同步信号相冲突的时域资源上不发送D2D信号;和/或,在所述D2D UE不发送D2D同步信号的D2D资源周期内,如果发送D2D信号的无线资源与用于发送D2D同步信号的时域和/或频域资源相冲突,则在冲突的时域和/或频域资源上不发送D2D信号。
对应于上述方法,在本实施例中还提供了一种D2D的通信装置,位于D2D UE中,该装置设置为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3是根据本发明实施例的D2D的通信装置的结构框图,如图3所示,该装置包括判断模块32和发送模块34,下面对各个模块进行详细说明:
判断模块32,设置为确定是否在当前D2D资源周期内发送D2D同步信号;发送模块34,与判断模块32相连,设置为在所述判断模块32的判断结果为是的情况下,发送所述D2D同步信号;其中,所述D2D UE确定是否在当前D2D资源周期内发送D2D同步信号的方式包括以下至少之一:接收到的指示信令;优先级规则。
优选地,所述判断模块32还可以设置为:在所述指示信令指示用于发送所述D2D同步信号的D2D资源周期的情况下,如果当前D2D资源周期是所述指示信令指示的D2D资源周期,则确定发送所述D2D同步信号。
优选地,所述指示信令中可以包括:用于指示D2D同步信号发送周期和/或D2D同步信号发送偏移的参数;所述D2D UE根据所述参数确定用于发送所述D2D同步信号的D2D资源周期。
优选地,所述指示信令中还可以包括:用于指示所述指示信令中的内容的有效时间的参数;所述D2D UE根据所述有效时间的参数更新所述指示信令中的内容。
优选地,所述D2D同步信号发送周期为N倍的D2D资源周期,N为正整数;和/或,所述D2D同步信号发送偏移为所述D2D UE发送D2D同步信号所在的D2D资源周期在所述D2D同步信号发送周期内的偏移量,以所述D2D资源周期为偏移粒度。
优选地,所述装置还包括:计算模块,与判断模块32相连,设置为通过所述D2D UE的标识号和指示所述D2D同步信号发送周期的参数计算得到所述D2D同步信号发送偏移。
优选地,所述指示信令中还可以包括:用于指示所述D2D UE发送D2D信号的无线资源位置的参数;所述D2D UE在所述无线资源位置的参数所对应的无线资源位置发送D2D信号。
优选地,所述判断模块32还可以设置为:在所述指示信令指示用于发送所述D2D同步信号的参考信号接收功率RSRP门限的情况下,如果当前D2D UE接收的RSRP满足所述RSRP门限,则所述UE发送所述D2D同步信号。
优选地,所述指示信令可以包括在广播消息中;或者,所述指示信令可以为UE专用信令,包括在专用RRC信令或者物理层信令中。
优选地,所述判断模块32还可以设置为:当所述D2D UE存在D2D信号需要发送时,确定用于发送所述D2D信号的资源位置;以及,如果发送所述D2D信号的无线资源与发送所述D2D同步信号的无线资源冲突,在发送所述D2D同步信号的D2D资源周期内,在发送所述D2D同步信号的时域资源内不发送所述D2D信号;或者,如果发送所述D2D信号的无线资源与发送所述D2D同步信号的无线资源冲突,则在所述D2D资源周期内不发送所述D2D同步信号;或者,如果发送所述D2D信号的无线资源与发送所述D2D同步信号的无线资源冲突,则在包含所述D2D同步信号时域
资源的D2D资源单元内不发送D2D信号,所述D2D资源单元为发送D2D信号的最小资源。例如,D2D资源单元在时域的最小单位为子帧,即只是在D2D同步信号所在的子帧上不发D2D信号。
优选地,所述判断模块32还可以设置为:当所述UE存在D2D信号需要发送时,所述UE确定用于发送所述D2D信号的资源位置;以及,如果发送所述D2D信号的无线资源与用于发送所述D2D同步信号的无线资源相冲突,则在冲突的无线资源内不发送所述D2D信号。
在本实施例中,还提供了另一种D2D的通信方法,图12是根据本发明实施例的另一种D2D的通信方法的流程图,如图12所示,该方法包括如下步骤:
步骤S1202,当前D2D终端UE接收来自相邻小区D2D UE的D2D同步信号,其中,所述当前D2D UE根据接收到的指示信令确定是否在当前D2D资源周期内接收D2D同步信号;
步骤S1204,所述当前D2D UE根据所述D2D同步信号实现与所述相邻小区D2D UE的D2D通信的同步。
在本实施例中,所述当前D2D UE可以在接收D2D同步信号的资源内,不接收D2D信号。
对应于上述另一种D2D的通信方法,在本实施例中还提供了另一种D2D的通信装置,位于D2D UE中,图13是根据本发明实施例的另一种D2D的通信装置的结构框图,如图13所示,该装置包括:
接收模块132,设置为接收来自相邻小区D2D UE的D2D同步信号,其中,所述当前D2D UE根据接收到的指示信令确定是否在当前D2D资源周期内接收D2D同步信号;同步模块134,与接收模块132相连,设置为根据所述D2D同步信号实现与所述相邻小区D2D UE的D2D通信的同步。
优选地,所述接收模块132还可以设置为:在接收D2D同步信号的资源内,不接收D2D信号。
下面结合优选实施例进行说明,以下优选实施例结合了上述实施例及其优选实施方式。
在以下优选实施例中,考虑到在inter-cell D2D通信尤其是非同步网络部署中,不同基站之间存在定时偏差,所属不同基站的相邻小区的UE之间进行D2D数据通信时,由于定时不对齐会导致UE无法正确接收来自邻区的D2D信号。UE要想正确接收邻区UE的D2D信号,必须先知道邻区UE发送的信号的参考定时和邻区D2D UE的资源分配信息。
基于上述考虑,以下优选实施例提供了一种设备到设备的信号通信方法,解决非同步网络部署中,不同基站的相邻小区之间D2D通信的同步问题。包括:邻区D2D UE按照预定的准则或信令指示发送同步信号,D2D UE通过邻区D2D UE发送的同步信号获取邻区D2D信号的发送定时,再结合邻区D2D资源分配信息,实现对邻区D2D信号的接收。
该方法具体描述为:所述D2D UE所属小区为参考小区,邻区为与参考小区不在同一eNB的相邻小区,所述邻区D2D UE根据预定义的准则或信令指示确定是否发送同步信号,D2D UE通过检测邻区D2D UE发送的同步信号来确定邻区D2D信号的发送定时,并依据邻区D2D信号的发送定时确定邻区D2D资源周期的起始位置。结合D2D资源周期的配置信息,所述D2D UE相应的D2D资源周期内完成对邻区D2D信号的接收。
下面对本优选实施例提供的D2D信号通信方法进行详细说明:
图4是根据本发明优选实施例的D2D信号通信方法的流程示意图,如图4所示,该设备到设备的通信方法,可用于小区间的D2D信号通信,包括:
步骤S402,D2D UE通过检测邻区D2D UE发送的D2D同步信号,确定对应邻区D2D信号的接收定时;
步骤S404,D2D UE获取邻区D2D资源的配置信息;
步骤S406,D2D UE根据确定的D2D信号接收定时和资源配置信息接收邻区D2D信号,并解出D2D信号内容。
其中,所述邻区D2D UE发送的D2D同步信号,包括D2D主同步信号(Primary D2D Synchronization Signal,简称为PD2DSS)和D2D辅同步信号(Secondary D2D Synchronization Signal,简称为SD2DSS)。所述邻区D2D UE在D2D资源周期内固定的时域和频域无线资源发送D2D同步信号。所述D2D资源周期是指蜂窝通信资源中划定的专门用于D2D通信的资源的周期。
其中,所述邻区D2D UE发送的D2D同步信号,包括全部的D2D UE或部分的D2D UE发送D2D同步信号。所述全部的D2D UE或部分的D2D UE通过接收的指示信令或优先级规则来确定是否发送D2D同步信号。
其中,所述通过接收的指示信令来确定是否发送D2D同步信号,所述接收的指示信令指示的内容包括参数N和发送偏移。所述D2D同步信号发送周期为N倍的D2D资源周期,N为正整数。所述D2D同步信号发送偏移为D2D UE发送D2D同步信号所在的D2D资源周期在D2D同步信号发送周期内的偏移量,以D2D资源周期为偏移粒度。小区内的D2D UE根据D2D同步信号发送周期和D2D同步信号发送偏移来发送D2D同步信号,每个D2D UE在每个D2D同步信号发送周期内有一次发送D2D同步信号的机会。对于上述D2D同步信号发送偏移的描述详细如下:对应D2D同步信号发送周期为N倍的D2D资源周期,根据D2D UE的标识号对N取模运算的结果值,可将D2D UE对应到不同组,不同组的D2D UE分别对应不同的D2D同步信号发送偏移,此发送偏移可以根据UE标识、当前无线帧号、D2D资源周期包含的无线帧数以及N计算得到。所述D2D UE的标识号可以唯一标识UE,与其他UE相区别。
其中,对于D2D资源周期内发送D2D同步信号的资源和发送D2D信号的资源,按照预定的准则处理,包括:在发送D2D同步信号的D2D资源周期内,对于同一D2D UE,包含发送D2D同步信号资源的时域资源内不能发送D2D信号。
其中,对于D2D资源周期内发送D2D同步信号的资源和发送D2D信号的资源,按照预定的准则处理,还包括:在发送D2D同步信号的D2D资源周期内,对于同一D2D UE,所述D2D UE在所述D2D资源周期内所有时域资源上随机选择发送D2D信号的资源,如果选择发送D2D信号的资源与发送D2D同步信号的资源在时域相冲突,即选择到了发送D2D同步信号的时域资源发送D2D信号,则所述D2D UE在所述D2D资源周期中取消D2D同步信号发送。
其中,对于D2D资源周期内发送D2D同步信号的资源和发送D2D信号的资源,按照预定的准则处理,还包括:在发送D2D同步信号的D2D资源周期内,对于同一D2D UE,所述D2D UE在所述D2D资源周期内所有时域资源上随机选择发送D2D信号的资源,如果选择发送D2D信号的资源与发送D2D同步信号的资源在时域相冲突,即选择到了发送D2D同步信号的时域资源发送D2D信号,则所述D2D UE在发送D2D信号与发送D2D同步信号相冲突的时域资源上,不发送D2D信号。
其中,对于D2D资源周期内发送D2D同步信号的资源和发送D2D信号的资源,按照预定的准则处理,还包括:在发送D2D同步信号的D2D资源周期内,对于同一
D2D UE,所述D2D UE选择在包含D2D同步信号的时域资源上发送D2D信号,则所述D2D UE在发送D2D信号与发送D2D同步信号相冲突的时域资源上,不发送D2D信号。
对于上述三种D2D信号及D2D同步信号的发送方式,在不发送D2D同步信号的D2D资源周期中,所述D2D UE在D2D资源周期内所有时域资源中选择发送D2D信号的资源,如果发送D2D信号的无线资源与用于发送D2D同步信号的时域和/或频域资源相冲突,则在冲突的时域和/或频域资源上不发送D2D信号。
其中,所述通过接收的指示信令来确定是否发送D2D同步信号,包括:对于RRC(Radio Resource Control,简称为RRC)连接态的D2D UE,基站可以通过UE专用信令来指示所述RRC连接态的D2D UE,所述RRC连接态的D2D UE根据UE专用信令指示的内容确定是否发送D2D同步信号,和/或发送D2D同步信号的周期,和/或发送D2D同步信号的偏移。所述D2D UE在D2D资源周期中固定的时域和频域资源发送D2D同步信号。
其中,所述信令包括:RRC专用信令和新增的下行控制信息(downlink control information,简称为DCI),所述RRC专用信令包括在现有RRC信令中增加信息和新增RRC信令。所述新增的下行控制信息的无线网络临时标识(Radio Network Tempory Identity,简称为RNTI)对应D2D同步信号。所述信令指示的内容包括所述D2D UE是否发送D2D同步信号,和/或发送D2D同步信号的周期,和/或发送D2D同步信号的偏移,和/或发送D2D同步信号的有效时间。
其中,所述信令指示的内容由基站按照一定的方式确定,包括:基站随机地选择所述RRC连接态的D2D UE的部分UE发送D2D同步信号,或者选择所述RRC连接态的D2D UE的全部发送D2D同步信号。
其中,所述信令指示的内容由基站按照一定的方式确定,还包括:基站通过调度的方式来选择发送D2D同步信号的D2D UE。其中,所述调度的方式包括:基站根据轮询的方式依次选择所述RRC连接态D2D UE的一个或一部分UE发送D2D同步信号;或者基站根据蜂窝上行链路的信道质量指示参数CQI(Channel Quality Indicator)或/和调制编码方式参数MCS(Modulation and Coding Scheme)的值,来选择发送D2D同步信号的D2D UE。其中,所述调度的方式还包括:基站测量所述RRC连接态的D2D UE对应的上行链路路损,根据对应的上行链路路损值来选择发送D2D同步信号的UE。
其中,对于D2D UE发送D2D同步信号和/或发送D2D信号,包括:对于发送D2D同步信号的D2D UE,基站通过半静态调度的方式为所述D2D UE在D2D资源周期内指定发送D2D信号的无线资源,并且在时域上避开用于发送D2D同步信号的无线资源。
其中,对于D2D UE发送D2D同步信号和/或发送D2D信号,还包括:对于发送D2D同步信号的D2D UE,基站通过半静态调度的方式为所述D2D UE在D2D资源周期内指定发送D2D信号的无线资源。并且使发送D2D信号的无线资源在时域上包含发送D2D同步信号的无线资源。在所述D2D UE发送D2D同步信号的D2D资源周期内,在发送D2D信号与发送D2D同步信号相冲突的时域资源上,不发送D2D信号。在所述D2D UE不发送D2D同步信号的D2D资源周期内,如果发送D2D信号的无线资源与用于发送D2D同步信号的时域和/或频域资源相冲突,则在冲突的时域和/或频域资源上不发送D2D信号。
在本实施例中,所述D2D UE获取邻区D2D资源的配置信息,包括:所述D2D UE从服务小区所属基站发送的***消息中获得。所述基站通过高层网络配置的方式获得邻区D2D资源的配置信息。
通过所述方法,能够实现小区间的D2D UE的信号通信。
下面结合附图及具体实施例详细说明本优选实施例提供的D2D信号通信方法。
本文所述的技术适用于蜂窝无线通信***或网络。常见的蜂窝无线通信***可以基于CDMA(Code Division Multiplexing Access,码分多址)技术、FDMA(Frequency Division Multiplexing Access,频分多址)技术、OFDMA(Orthogonal-FDMA,正交频分多址)技术、SC-FDMA(Single Carrier-FDMA,单载波频分多址)技术,等。例如,3GPP(3rd Generation Partnership Project)LTE(Long Term Evolution,长期演进)/LTE-A(LTE-Advanced,高级长期演进)蜂窝通信***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***中,用于通信的无线资源(Radio Resource)是时-频两维的形式。例如,图5是根据本发明优选实施例的无线资源结构的示意图,如图5所示,对于LTE/LTE-A***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)。而根
据循环前缀(Cyclic Prefix,简称为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RB(Resource Block,资源块),对应物理资源的一个PRB(Physical RB,物理资源块)。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,简称为RE)。如图5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RRC(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6是根据本发明优选实施例的蜂窝网络部署示意图,如图6所示,可以是3GPP LTE/LTE-A***,或者其它的蜂窝无线通信技术。在蜂窝无线通信***的接入网中,网络设备一般包括一定数量的基站(base station,或者称为节点B,Node B,或者演进的节点B,evolved Node B,eNB,或者增强的节点B,enhanced Node B,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(E-UTRAN,Evolved Universal Terrestrial Radio Access Network,演进的通用陆地无线接入网络)。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6中只示出了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,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之间的时间同步,即接收端获取到对应D2D信号的发送定时,以确定对应D2D信号的接收定时。对于小区间的D2D通信,接收端UE可以通过检测邻区D2D UE发送的D2D同步信号,来确定对应邻区的D2D接收定时。同时接收端UE可以从服务小区所属的基站获取到邻区D2D资源的配置信息。在此基础上,接收端UE才能确定接收到D2D信号的资源位置,以解出对应D2D信号的内容。对于邻区D2D UE发送的D2D同步信号,有多种实现方式。
实施例一
一种简单的实现D2D UE发送同步信号的方式,相当于接收的指示信令中,N为1,发送偏移为0。就是小区所有的D2D UE默认发送D2D同步信号,即在每个D2D资源周期内固定的资源上,D2D UE都发送D2D同步信号。并且,小区内所有D2D UE都基于相同的发送定时假设发送D2D同步信号,在接收UE侧可以形成合并增益。
对于同步部署网络,相邻小区之间的同步定时严格对齐,相邻小区的D2D资源区域也是对齐的。而对于非同步部署网络,相邻小区之间的同步定时不是对齐的,相邻小区的D2D资源区域可能是对齐的,也可能是不对齐的。因此,D2D同步信号可能会对D2D信号或/和蜂窝信号产生干扰。当所有D2D UE都发送D2D同步信号时,为了减小D2D同步信号对D2D信号或/和蜂窝信号的干扰,D2D UE可以采取降低发送功率的方式来发送D2D同步信号。
基于D2D发现来描述,为了避免D2D同步信号与D2D发现信号的冲突,当D2D UE选择在包含D2D同步信号的资源上发送D2D发现信号时,对应发送D2D同步信号的SC-FDM符号的所有频域资源,都不用于发送D2D信号。图7a和7b分别为根据本发明优选实施例一的D2D同步信号发送的示意图一和二,如图7a和7b所示为本实施例一个例子,其中图7a对应1个SC-FDM符号发送D2D同步信号,图7b对应2个SC-FDM符号发送D2D同步信号。此处仅仅是举例说明,发送D2D同步信号的SC-FDM符号数还可能大于2个,发送D2D同步信号的SC-FDM符号之间可能是连续的也可能是离散的。701、705为发现资源周期内固定用于发送D2D同步信号的子帧,图中以第一个子帧为例,702、706为D2D同步信号的资源位置,702对应时域为1个SC-FDM符号,706对应时域为2个SC-FDM符号,频域为带宽的中间6个RB。704、708为D2D同步信号所在的SC-FDM符号,704对应1个SC-FDM符号,708对应2个SC-FDM符号。703、707为发现信号的资源位置,对应D2D同步信号的SC-FDM符号即704上不发送发现信号(发现信号为D2D信号的一种)。
实施例二
接收的指示信令中包括参数N和发送偏移,小区内所有D2D UE按照N倍D2D资源周期的D2D同步信号发送周期发送D2D同步信号,N为正整数,在每个D2D同步信号发送周期内,每个D2D UE发送一次D2D同步信号。每个D2D UE根据发送偏移在D2D同步信号发送周期内对应的D2D资源周期内发送D2D同步信号,这样对应不同发送偏移的D2D UE就在不同的D2D资源周期内发送同步信号。同步信号固定在D2D资源周期内的第一个子帧发送。
D2D UE还可以根据接收的指示信令里的参数N,以及结合UE标识、无线帧号等参数计算出对应发送D2D同步信号的发送偏移。
根据N可以将D2D UE分到N个不同的组,UE分组可以基于能唯一标识UE的UE标识进行,比如UE的IMSI(International Mobile Subscriber Identification Number)号,或者基站调度UE时分配的ID。以discovery为例,假设discovery资源周期为M个无线帧,UE标识记为UEID,可以根据(UEID mod N)得到UE的分组索引j,j=0,1,…N-1。再根据((SFN/M)mod N)得到发送同步信号的周期索引k,分组在j组的D2D UE选择在周期索引k=j的周期内发送同步信号。其中mod为取模运算,/为除法运算,SFN为无线帧号索引。
图8是根据本发明优选实施例二的D2D同步信号发送的示意图,如图8所示,是N=3的UE分成3组的一个例子。D2D UE每隔3倍的D2D资源周期长度发送一次D2D同步信号。
D2D UE还可以根据接收的指示信令里的RSRP门限参数实现D2D同步信号发送。同时也可以通过分组方式实现不同UE对应不同的D2D同步信号发送偏移,比如:将RSRP门限分成N组,N为正整数,每一组门限对应一组UE,满足不同门限的D2D UE分别归属到不同组。RSRP门限值由基站通过广播下发给所有D2D UE。例如,将对应服务小区的RSRP对应的判决门限分成门限范围1和门限范围2。对某一个D2D UE,如果服务小区RSRP满足门限范围1则该UE分到第一组,如果满足门限范围2则该UE分到第二组。不同组的D2D UE对应不同的D2D同步信号发送周期和D2D同步信号发送偏移。当N=1时,则只有一个RSRP门限范围,只要UE满足一个门限范围就发送D2D同步信号。比如:UE的RSRP小于RSRP门限的话,就发送D2D同步信号。
实施例三
D2D同步信号在D2D资源周期的第一个子帧发送,当D2D UE在第一个子帧上有D2D信号(D2D发现信号或D2D通信信号)发送时,就会出现发送资源的重叠,对于发送D2D同步信号和发送D2D信号的资源冲突,解决方式有以下几种:
方式一:D2D同步信号优先于D2D信号发送。在发送D2D同步信号的子帧上不发送D2D信号。以D2D发现为例,在发送D2D同步信号的发现资源周期,D2D UE选择发送D2D发现信号的资源时,在第一个子帧之外的发现资源周期内其它资源上选择发送D2D发现信号的资源。而对于不发送D2D同步信号的发现资源周期,D2D UE在整个发现资源周期内选择发送D2D发现信号的资源。当选择发送D2D发现信号的资源与发送D2D同步信号的资源有冲突时,在D2D同步信号对应的SC-FDM符号内,发送D2D同步信号的频域资源上不发送D2D信号。图9是根据本发明优选实施例三的D2D同步信号发送的示意图一,如图9所示,901对应为D2D同步信号的资源位置。
方式二:D2D信号优先于D2D同步信号发送。在发送D2D同步信号的D2D资源周期内,如果D2D UE选择了第一个子帧的资源发送D2D信号,那么在这个D2D资源周期内,放弃发送D2D同步信号,同时,对于发送D2D信号的资源与发送同步信号的资源有冲突的时域和频域资源,不发送D2D信号。即在D2D同步信号对应的SC-FDM符号内,发送D2D同步信号的频域资源上不发送D2D信号。图10是根据本发明优选实施例三的D2D同步信号发送示意图二,如图10所示,为方式二的一个示例,D2D同步信号的发送周期为3倍的发现资源周期,即N=3。按照不同的D2D同步信号发送偏移,D2D UE可以分成3组,1001、1002和1003分别对应第一组、第二组和第三组D2D UE发送D2D同步信号,发送D2D同步信号的资源固定为发现资源周期的第一个子帧。1005对应有D2D UE选择在第一个子帧上发送发现信号,在这个发现资源周期对应第一组D2D UE发送D2D同步信号,但由于在第一个子帧上要发送发现信号,因此,放弃发送D2D同步信号。并且,在1004对应的发送D2D同步信号的资源位置,不映射发现信号的数据,以避免与第一组D2D UE中其它UE发送的D2D同步信号互相干扰。
方式三:D2D信号与同步信号集中发送。在发送D2D同步信号的资源周期,D2D UE选择发送D2D信号的资源时,主动将D2D信号的资源选择在D2D资源周期内第一个子帧,在第一个子帧中对应发送D2D同步信号的SC-FDM符号上不映射D2D信号的数据。而对于不发送D2D同步信号的资源周期,D2D UE选择发送D2D信号的资源时,在整个D2D资源周期内选择发送D2D信号的资源。当选择发送D2D信号的
资源与发送同步信号的资源有冲突时,在冲突的资源上不发送D2D信号。即在D2D同步信号对应的SC-FDM符号内,发送D2D同步信号的频域资源上不发送D2D信号。
图11是根据本发明优选实施例三的D2D同步信号发送的示意图三,如图11所示,为方式三的一个例子,1100和1103为发现资源周期中的第一个子帧,对某一D2D UE,1100中发送了D2D同步信号,1103中没有发送D2D同步信号。1102和1104对应为发现信号资源。在1100中,D2D UE选择与D2D同步信号在同一个子帧发送。1101为D2D同步信号所在SC-FDM符号,在D2D同步信号所在的整个符号上,都不映射发现信号的数据。在1103中,因为此D2D UE不发送D2D同步信号,在D2D同步信号资源位置对应的SC-FDM符号内,D2D同步信号的频域资源之外的频域资源上可以映射发现信号的数据。
实施例四
对于RRC连接态的D2D UE,可以通过基站选择哪些UE发送D2D同步信号,通过信令方式指示D2D UE。基站可以通过随机选择的方式来确定发送D2D同步信号的UE,如从RRC连接态的D2D UE中随机选择一个D2D UE,比如UE1,发送D2D同步信号,在一段时间后,如10ms,20ms,50ms…等等,再选择另外一个D2D UE,比如UE2,发送D2D同步信号。同样,基站还可以选择RRC连接态的D2D UE中一部分UE发送D2D同步信号,比如选择UE1,UE2,…,UEi发送D2D同步信号,这里i小于K,K为小区中RRC连接态D2D UE个数。另外,基站还可以选择不同的D2D UE按照不同的发送周期发送D2D同步信号。比如选择UE1,UE2,…,UEi按发送周期N1发送D2D同步信号,选择UEi+1,UEi+2,…,UEi+j按发送周期N2发送D2D同步信号。这里i+j要小于小区中RRC连接态D2D UE个数K。
基站还可以通过调度的方式来选择发送D2D同步信号的D2D UE,根据以下几种方式:
方式1:通过轮询的方式依次选择1个D2D UE发送D2D同步信号,或者根据UE ID将RRC连接态D2D UE分成3组,按照1→2→3→1的顺序,选择不同组的D2D UE分别发送D2D同步信号。
方式2:根据蜂窝上行链路的CQI,和/或上行数据的MCS,选择CQI和/或MCS较大的N个D2D UE发送D2D同步信号,例如取N为2,4,8,16…等。
方式3:根据测量蜂窝上行链路的路损,选择路损较大的N个D2D UE来发送D2D同步信号,例如取N为2,4,8,16…等。
基站通过半静态方式为RRC连接态D2D UE指定专用资源,设置为发送D2D信号。对于发送D2D同步信号的D2D UE,基站为其分配专用资源时,要避开发送D2D同步信号的子帧,比如D2D资源周期内的第一个子帧。
基站可以通过RRC专用信令指示D2D UE,指示信令通过bit串来表示指示的内容,包括是否发送D2D同步信号,发送周期,以及发送同步信号的有效时间。例如,用16bit来表示,其中1bit表示是否发送D2D同步信号,7bit表示发送周期,以D2D资源周期为单位,最大可支持128倍D2D资源周期长的发送周期,8bit表示发送同步信号的有效时间,最大可支持256倍D2D资源周期长的有效时间。基站指示是否发送D2D同步信号的信息也可以与指示D2D专用资源的信息放在同一信令中指示,发送同步信号的有效期可以与D2D专用资源分配的有效期一致。另外,基站还可以通过新增DCI格式来指示D2D同步信号发送信息,新增DCI的RNTI对应D2D同步信号,DCI内容包括是否发送D2D同步信号,发送周期,以及发送同步信号的有效时间。
在另外一个实施例中,还提供了一种软件,该软件用于执行上述实施例及优选实施例中描述的技术方案。
在另外一个实施例中,还提供了一种存储介质,该存储介质中存储有上述软件,该存储介质包括但不限于光盘、软盘、硬盘、可擦写存储器等。
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。
如上所述,本发明实施例提供的一种D2D的通信方法及装置,具有以下有益效果:解决了相关技术中隶属不同基站下相邻小区的D2D UE无法实现定时同步的问题,达到了实现隶属不同基站下相邻小区的D2D UE之间在确定发送D2D同步信号的D2D
资源周期内,发送D2D同步信号进行同步,并且考虑了发送D2D同步信号的D2D资源周期,为减小发送D2D同步信号对D2D通信产生的影响提供技术基础的效果。
Claims (28)
- 一种设备到设备D2D的通信方法,包括:D2D终端UE确定是否在当前D2D资源周期内发送D2D同步信号;如果是,则所述D2D UE发送所述D2D同步信号;其中,所述D2D UE确定是否在当前D2D资源周期内发送D2D同步信号的方式包括以下至少之一:接收到的指示信令;优先级规则。
- 根据权利要求1所述的方法,其中,D2D UE根据所述指示信令确定是否发送所述D2D同步信号包括:在所述指示信令指示用于发送所述D2D同步信号的D2D资源周期的情况下,如果当前D2D资源周期是所述指示信令指示的D2D资源周期,则所述UE发送所述D2D同步信号。
- 根据权利要求2所述的方法,其中,所述指示信令中包括:用于指示D2D同步信号发送周期和/或D2D同步信号发送偏移的参数;所述D2D UE根据所述参数确定用于发送所述D2D同步信号的D2D资源周期。
- 根据权利要求2所述的方法,其中,所述指示信令中还包括:用于指示所述指示信令中的内容的有效时间的参数;所述D2D UE根据所述有效时间的参数更新所述指示信令中的内容。
- 根据权利要求3或4所述的方法,其中,所述D2D同步信号发送周期为N倍的D2D资源周期,N为正整数;和/或,所述D2D同步信号发送偏移为所述D2D UE发送D2D同步信号所在的D2D资源周期在所述D2D同步信号发送周期内的偏移量,以所述D2D资源周期为偏移粒度。
- 根据权利要求3所述的方法,其中,还包括:所述D2D同步信号发送偏移还可以通过所述D2D UE的标识号和指示所述D2D同步信号发送周期的参数计算得到。
- 根据权利要求2所述的方法,其中,所述指示信令中还包括:用于指示所述D2D UE发送D2D信号的无线资源位置的参数;所述D2D UE在所述无线资源位置的参数所对应的无线资源位置发送D2D信号。
- 根据权利要求1所述的方法,其中,D2D UE根据所述指示信令确定是否发送所述D2D同步信号还包括:在所述指示信令指示用于发送所述D2D同步信号的参考信号接收功率RSRP门限的情况下,如果当前D2D UE接收的RSRP满足所述RSRP门限,则所述UE发送所述D2D同步信号。
- 根据权利要求1至8中任一项所述的方法,其中,所述指示信令包括在广播消息中;或者,所述指示信令为UE专用信令,包括在专用RRC信令或者物理层信令中。
- 根据权利要求1所述的方法,其中,D2D UE根据所述优先级规则确定是否发送所述D2D同步信号还包括:当所述D2D UE存在D2D信号需要发送时,所述D2D UE确定用于发送所述D2D信号的资源位置;以及,如果发送所述D2D信号的无线资源与发送所述D2D同步信号的无线资源冲突,在发送所述D2D同步信号的D2D资源周期内,所述D2D UE在发送所述D2D同步信号的时域资源内不发送所述D2D信号;或者,所述D2D UE在所述D2D资源周期内不发送所述D2D同步信号;或者,所述D2D UE在包含所述D2D同步信号时域资源的D2D资源单元内不发送D2D信号,所述D2D资源单元为发送D2D信号的最小资源。
- 根据权利要求1所述的方法,其中,D2D UE根据所述优先级规则确定是否发送所述D2D同步信号还包括:当所述UE存在D2D信号需要发送时,所述UE确定用于发送所述D2D信号的资源位置;以及,如果发送所述D2D信号的无线资源与用于发送所述D2D同步信号的无线资源相冲突,则在冲突的无线资源内不发送所述D2D信号。
- 根据权利要求1至11中任一项所述的方法,其中,还包括:基站选择无线资源控制RRC连接态的D2D UE的部分或者全部UE发送D2D同步信号;所述基站根据选择结果下发所述指示信令。
- 根据权利要求12所述的方法,其中,所述方法还包括:对于发送D2D同步信号的D2D UE,基站通过半静态调度的方式为所述D2D UE在D2D资源周期内指定发送D2D信号的无线资源,并且在时域上避开用于发送D2D同步信号的无线资源。
- 一种设备到设备D2D的通信方法,包括:当前D2D终端UE接收来自相邻小区D2D UE的D2D同步信号,其中,所述当前D2D UE根据接收到的指示信令确定是否在当前D2D资源周期内接收D2D同步信号;所述当前D2D UE根据所述D2D同步信号实现与所述相邻小区D2D UE的D2D通信的同步。
- 根据权利要求14所述的方法,其中,所述方法还包括:所述当前D2D UE在接收D2D同步信号的资源内,不接收D2D信号。
- 一种设备到设备D2D的通信装置,位于D2D终端UE中,包括:判断模块,设置为确定是否在当前D2D资源周期内发送D2D同步信号;发送模块,设置为在所述判断模块的判断结果为是的情况下,发送所述D2D同步信号;其中,所述D2D UE确定是否在当前D2D资源周期内发送D2D同步信号的方式包括以下至少之一:接收到的指示信令;优先级规则。
- 根据权利要求16所述的装置,其中,所述判断模块还设置为:在所述指示信令指示用于发送所述D2D同步信号的D2D资源周期的情况下,如果当前D2D资源周期是所述指示信令指示的D2D资源周期,则确定发送所述D2D同步信号。
- 根据权利要求17所述的装置,其中,所述指示信令中包括:用于指示D2D同步信号发送周期和/或D2D同步信号发送偏移的参数;所述D2D UE根据所述参数确定用于发送所述D2D同步信号的D2D资源周期。
- 根据权利要求17所述的装置,其中,所述指示信令中还包括:用于指示所述指示信令中的内容的有效时间的参数;所述D2D UE根据所述有效时间的参数更新所述指示信令中的内容。
- 根据权利要求18或19所述的装置,其中,所述D2D同步信号发送周期为N倍的D2D资源周期,N为正整数;和/或,所述D2D同步信号发送偏移为所述D2D UE发送D2D同步信号所在的D2D资源周期在所述D2D同步信号发送周期内的偏移量,以所述D2D资源周期为偏移粒度。
- 根据权利要求18所述的装置,其中,所述装置还包括:计算模块,设置为通过所述D2D UE的标识号和指示所述D2D同步信号发送周期的参数计算得到所述D2D同步信号发送偏移。
- 根据权利要求17所述的装置,其中,所述指示信令中还包括:用于指示所述D2D UE发送D2D信号的无线资源位置的参数;所述D2D UE在所述无线资源位置的参数所对应的无线资源位置发送D2D信号。
- 根据权利要求16所述的装置,其中,所述判断模块还设置为:在所述指示信令指示用于发送所述D2D同步信号的参考信号接收功率RSRP门限的情况下,如果当前D2D UE接收的RSRP满足所述RSRP门限,则所述UE发送所述D2D同步信号。
- 根据权利要求16至23中任一项所述的装置,其中,所述指示信令包括在广播消息中;或者,所述指示信令为UE专用信令,包括在专用RRC信令或者物理层信令中。
- 根据权利要求16所述的装置,其中,所述判断模块还设置为:当所述D2D UE存在D2D信号需要发送时,确定用于发送所述D2D信号的资源位置;以及,如果发送所述D2D信号的无线资源与发送所述D2D同步信号的无线资源冲突,在发送所述D2D同步信号的D2D资源周期内,在发送所述D2D同步信号的时域资源内不发送所述D2D信号;或者,在所述D2D资源周期内不发送所述D2D同步信号;或者,在包含所述D2D同步信号时域资源的D2D资源单元内不发送D2D信号,所述D2D资源单元为发送D2D信号的最小资源。
- 根据权利要求16所述的装置,其中,所述判断模块还设置为:当所述UE存在D2D信号需要发送时,所述UE确定用于发送所述D2D信号的资源位置;以及,如果发送所述D2D信号的无线资源与用于发送所述D2D同步信号的无线资源相冲突,则在冲突的无线资源内不发送所述D2D信号。
- 一种设备到设备D2D的通信装置,位于D2D终端UE中,包括:接收模块,设置为接收来自相邻小区D2D UE的D2D同步信号,其中,所述D2D UE根据接收到的指示信令确定是否在当前D2D资源周期内接收D2D同步信号;同步模块,设置为根据所述D2D同步信号实现与所述相邻小区D2D UE的D2D通信的同步。
- 根据权利要求27所述的装置,其中,所述接收模块还设置为:在接收D2D同步信号的资源内,不接收D2D信号。
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Also Published As
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US20170230923A1 (en) | 2017-08-10 |
EP3179789A4 (en) | 2017-08-16 |
CN104219758A (zh) | 2014-12-17 |
EP3179789A1 (en) | 2017-06-14 |
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