WO2016131344A1 - 一种设备到设备发送、接收、调度方法和相应装置 - Google Patents

一种设备到设备发送、接收、调度方法和相应装置 Download PDF

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WO2016131344A1
WO2016131344A1 PCT/CN2015/100208 CN2015100208W WO2016131344A1 WO 2016131344 A1 WO2016131344 A1 WO 2016131344A1 CN 2015100208 W CN2015100208 W CN 2015100208W WO 2016131344 A1 WO2016131344 A1 WO 2016131344A1
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Prior art keywords
subframe
data packet
feedback
retransmission
interval
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PCT/CN2015/100208
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English (en)
French (fr)
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吴栓栓
戴博
陈琳
郁光辉
贺海港
黄莹
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中兴通讯股份有限公司
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Publication of WO2016131344A1 publication Critical patent/WO2016131344A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling

Definitions

  • This application relates to, but is not limited to, the field of wireless communications.
  • D2D Device-to-Device
  • Proximity Service Proximity Service
  • the user equipment User Equipment, UE for short
  • D2D not only saves wireless spectrum resources, but also reduces the data transmission pressure of the core network.
  • Wireless communication typically includes communication modes such as broadcast, groupcast, and unicast. Broadcasting usually does not have a specific receiving end. For example, a device interested in the service sent by the transmitting end can receive the service; multicast is another one-to-many communication, and the terminal constituting one communication group can receive the sending by the transmitting end. Service; unicast is to send a service to a specific receiver.
  • LTE Rel-12 defines D2D broadcast communication at the physical layer.
  • the broadcast communication of LTE Rel-12 includes two communication modes: mode 1 and mode 2.
  • the former is a broadcast communication based on eNB scheduling; the latter is autonomously selected by the UE in the D2D communication resource pool for D2D transmission.
  • D2D broadcast communication is characterized by no HARQ ACK feedback, which is obviously not optimal for unicast communication.
  • This paper provides a device-to-device sending, receiving, scheduling method and corresponding device to implement HARQ feedback and improve the transmission efficiency of D2D communication.
  • a device-to-device D2D data packet receiving method includes:
  • the first UE checks the received D2D data packet and sends feedback information indicating a check result, where the feedback information is an acknowledgement ACK or a non-acknowledgement NACK, and if the feedback information is a NACK, the receiving station Retransmission of D2D packets.
  • the subframe that sends the feedback information is a feedback subframe
  • the method further includes: determining, by the first UE, a location of the feedback subframe according to a preset rule or determining according to an indication in the first control signaling. The position of the feedback subframe.
  • the determining, by the first UE, the location of the feedback subframe according to a preset rule where the preset rule is that the feedback subframe and the subframe that receives the D2D data packet have a a first preset interval, where the first preset interval is a fixed time domain interval or a minimum time domain interval, and the first UE determines, according to the subframe position of receiving the D2D data packet and the first preset interval The position of the feedback subframe.
  • the method further includes: when the determined feedback subframe has a D2D When the data is received, the first UE abandons the D2D data reception; when the determined feedback subframe has a D2D data transmission requirement and the target UE of the D2D data transmission is not the second UE, the first UE gives up D2D data transmission; when the determined feedback subframe has a D2D data transmission requirement and the target UE of the D2D data transmission is the second UE, the first UE multiplexes the feedback information with the D2D data After sending in the feedback subframe.
  • the determining, by the first UE, the location of the feedback subframe according to the indication in the first control signaling that: the indication in the first control signaling includes a parameter used to indicate a location of the feedback subframe, Or including a parameter for indicating a first feedback interval, where the feedback subframe has a first feedback interval between the subframes that receive the D2D data packet, the first feedback interval is a fixed time domain interval, or is a minimum time domain.
  • the first UE determines the location of the feedback subframe according to the indication in the first control signaling.
  • determining, by the first UE, the location of the feedback subframe according to the minimum time domain interval including: determining that the first available feedback subframe that meets the minimum time domain interval is a feedback for sending feedback information a subframe, the first available feedback subframe refers to a subframe that satisfies at least one of the following conditions: a subframe configured with a feedback information transmission resource or indicated as a feedback information transmission subframe, and a cell not the first UE
  • the communication data receives or transmits a subframe, and is not a D2D data receiving or transmitting subframe of the first UE, and is not a random access subframe of the first UE.
  • the receiving, by the first UE, the retransmission of the D2D data packet includes: the first UE receiving a retransmission of the D2D data packet according to a scheduling of a network side device or a second UE; or The first UE receives the retransmission of the D2D data packet in the same hybrid automatic retransmission HARQ process; or the first UE determines the retransmission position of the D2D data according to the location of the feedback subframe and the second preset interval, The second preset interval is a fixed time domain interval, and the first UE receives retransmission of the D2D data packet at the retransmission position of the D2D data.
  • the first UE receives the retransmission of the D2D data packet according to the scheduling of the network side device or the second UE, where the first UE receives the second control signaling sent by the network side device or the second The second control signaling sent by the UE in the resource for the D2D scheduling allocation SA retransmission, the second control signaling is used to schedule retransmission of the D2D data packet, and the first UE follows the second control The indication of signaling receives a retransmission of the D2D data packet.
  • the second control signaling includes part or all of the following parameters, used to indicate retransmission of the D2D data packet: a HARQ process ID, a new data indicating an NDI, a redundancy version RV, and a time domain of data retransmission And/or frequency domain resource allocation parameters.
  • the first UE receives the retransmission of the D2D data packet in the same hybrid automatic retransmission HARQ process, including: the first UE receiving the D2D data in a subframe corresponding to the same HARQ process.
  • the subframe corresponding to the same HARQ process is a subframe corresponding to the HARQ process of the cellular communication uplink transmission or a subframe corresponding to the HARQ process of the D2D communication.
  • the first UE receives the D2D data packet sent by the second UE, where the first UE receives the D2D data packet in the subframe indicated by the bitmap, and the first UE receives the D2D data packet.
  • the retransmission includes: the first UE receives retransmission of the D2D data packet in a subframe indicated by the bitmap; each bit in the bitmap corresponds to one HARQ process.
  • a D2D data packet receiving apparatus includes a first D2D data packet receiving module, a verification module, a first sending module, and a second D2D data packet receiving module, wherein:
  • the first D2D data packet receiving module is configured to: receive a D2D data packet sent by the second UE;
  • the verification module is configured to: verify the D2D data packet
  • the first sending module is configured to: send feedback information indicating a check result, where the feedback information is an acknowledgement ACK or a non-acknowledgement NACK;
  • the second D2D data packet receiving module is configured to: when the feedback information is a NACK, receive a retransmission of the D2D data packet.
  • a D2D data packet sending method includes:
  • the feedback information used to indicate the verification result and the feedback information is a non-acknowledgement NACK, or receiving the authorization information sent by the network side device to indicate the D2D data packet retransmission, to the The first UE retransmits the D2D data packet.
  • the subframe in which the first UE sends the feedback information is a feedback subframe
  • the method further includes: determining, by the second UE, a location of the feedback subframe according to a preset rule or according to the first control signal The indication in the order determines the location of the feedback subframe, and the feedback information is received in the feedback subframe.
  • a first preset interval where the first preset interval is a fixed time domain interval or a minimum time domain interval, and the second UE determines, according to the subframe position that sends the D2D data packet and the first preset interval Feedback subframe position.
  • the determining, by the second UE, the location of the feedback subframe according to the indication in the first control signaling that: the indication in the first control signaling includes a location for indicating the feedback subframe position a parameter, or a parameter for indicating a first feedback interval, where the feedback subframe has a first feedback interval between the subframes that send the D2D data packet, and the first feedback interval is between fixed time intervals
  • the second UE determines the location of the feedback subframe according to an indication in the first control signaling.
  • the determining, by the second UE, the location of the feedback subframe according to the minimum time domain interval including: determining that the second available feedback subframe that meets the minimum time domain interval is a feedback subframe that receives feedback information, where The second available feedback subframe refers to a subframe that satisfies at least one of the following conditions: a feedback information transmission resource is configured, and a D2D data reception or transmission subframe that is not the second UE is not randomly connected to the second UE.
  • the second available feedback subframe refers to a subframe that satisfies at least one of the following conditions: a feedback information transmission resource is configured, and a D2D data reception or transmission subframe that is not the second UE is not randomly connected to the second UE.
  • the retransmitting the D2D data packet to the first UE includes: determining, by the second UE, a resource for D2D data packet retransmission according to second control signaling sent by the network side device, where Retransmitting the D2D data packet in the resource for D2D data packet retransmission; or the second UE determining a resource for D2D data packet retransmission, sending the first UE to send the The second control signaling of the D2D data packet retransmission, and retransmitting the D2D data packet in the resource for D2D data packet retransmission.
  • the retransmitting the D2D data packet to the first UE includes: the second UE retransmitting the D2D data packet in a same hybrid automatic retransmission HARQ process, the same HARQ
  • the subframe corresponding to the process is a subframe corresponding to the HARQ process of the cellular communication uplink transmission or a subframe corresponding to the HARQ process of the D2D communication; or the second UE is configured according to the location of the feedback subframe and the second preset And determining, by the interval, a retransmission position of the D2D data, where the second preset interval is an interval between the feedback subframe and a retransmission subframe of the D2D data packet, where the second preset interval is a fixed time domain interval, where The second UE retransmits the D2D data packet at a retransmission location of the D2D data.
  • the second UE determines a resource for D2D data packet retransmission, and sends, to the first UE, second control signaling for scheduling the D2D data packet retransmission, where the function is used for D2D Retransmitting the D2D data packet in a resource retransmitted by the data packet, including: sending, by the second UE, a resource for D2D scheduling allocation SA retransmission to the first UE, for scheduling, retransmitting the D2D data packet
  • the second control signaling, the second UE retransmits the D2D data packet on the retransmission resource indicated by the second control signaling.
  • the second control signaling includes part or all of the following parameters, used to indicate retransmission of the D2D data packet: a HARQ process ID, a new data indicating an NDI, a redundancy version RV, and data Time domain and/or frequency domain resource allocation parameters for retransmission.
  • the transmitting, by the second UE, the D2D data packet to the first UE includes: the second UE transmitting a D2D data packet in a subframe indicated by the bitmap; and the second UE retransmitting to the first UE
  • the D2D data packet includes: the second UE retransmits the D2D data packet in a subframe indicated by the bitmap; each bit in the bitmap corresponds to one HARQ process.
  • a device-to-device D2D data packet transmitting apparatus includes a transmission module and a retransmission module, wherein:
  • the transmitting module is configured to: transmit a D2D data packet to the first UE;
  • the retransmission module is configured to: when receiving feedback information for indicating a verification result sent by the first UE, and the feedback information is a non-acknowledgement NACK, or receiving a D2D data packet sent by the network side device Retransmitting the authorization information, retransmitting the D2D data packet to the first UE.
  • a D2D communication scheduling method includes:
  • the network side device sends the first authorization information to the second user equipment UE, where the first authorization information is used to schedule the second UE to send the D2D data packet to the first UE;
  • the received feedback information is a NACK
  • receiving, by the first UE, feedback information, which is used to indicate the D2D data packet verification result includes: the network side device determining, and determining, by using the first preset between the subframes for transmitting the D2D data packet
  • the interval subframe is a feedback subframe in which the first UE sends feedback information, where the first preset interval is a fixed time domain interval or a minimum time domain interval, and the network side device receives the first subframe in the feedback subframe.
  • the network side device determines a subframe that has a first preset interval between the subframes that send the D2D data packet, and sends a feedback subframe to the first UE, where the network side device includes: the network side device Determining, by the first UE, a subframe of a D2D data packet, a subframe of a fixed time interval as a feedback subframe for receiving feedback information; or determining, by the network side device, a D2D data packet with the first UE
  • the third available feedback subframe that satisfies the minimum time domain interval of the subframe is a feedback subframe that receives feedback information
  • the third available feedback subframe refers to a subframe that satisfies at least one of the following conditions: configured with feedback information transmission
  • the resource is not the D2D data receiving or transmitting subframe of the first UE, and the D2D data receiving or transmitting subframe of the second UE is not a random access subframe.
  • the method further includes: the network side device sending a second control signaling to the first UE, where the second control signaling is used to schedule the first
  • the UE receives the retransmission of the D2D data packet; the second control signaling includes part or all of the following parameters, and is used to indicate the retransmission of the D2D data packet: the HARQ process number, the new data indicating the NDI, the redundancy version RV, and the data. Time domain and/or frequency domain resource allocation parameters for retransmission.
  • a device-to-device D2D communication scheduling device includes a first scheduling module, a feedback information receiving module, and a second scheduling module, wherein:
  • the first scheduling module is configured to send first authorization information to the second user equipment UE, where the first authorization information is used to schedule the second UE to send a D2D data packet to the first UE;
  • the feedback information receiving module is configured to: receive feedback information sent by the first UE to indicate the D2D data packet check result, where the feedback information is an acknowledgement ACK or a non-acknowledgement NACK;
  • the second scheduling module is configured to: when the feedback information received by the feedback information receiving module is a NACK, send second authorization information to the second UE, where the second authorization information is used to schedule the The second UE retransmits the D2D data packet.
  • the embodiment of the present invention can implement the implementation of the existing D2D communication as much as possible, and can introduce the HARQ ACK/NACK feedback and the feedback based retransmission based on the existing D2D transmission mode without significantly increasing the terminal implementation complexity and signaling overhead.
  • the D2D unicast communication improves the spectral efficiency of D2D through HARQ-based unicast communication and expands the application range of D2D communication.
  • FIG. 1 is a schematic diagram of a cellular network deployment in the related art
  • FIG. 2 is a schematic diagram of a radio resource structure in the related art
  • FIG. 3 is a flowchart of a method for receiving a D2D data packet according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a method for transmitting a D2D data packet according to Embodiment 2 of the present invention.
  • FIG. 5 is a flowchart of a third D2D communication scheduling method according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a fourth scheduling apparatus according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a receiving apparatus according to Embodiment 4 of the present invention.
  • FIG. 8 is a schematic structural diagram of a transmitting apparatus according to Embodiment 4 of the present invention.
  • 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
  • a radio resource for communication is a form of time-frequency two-dimensional.
  • uplink and downlink communication resources are divided in units of radio frames in the time direction, and each radio frame has a length of 10 ms, including There are 10 sub-frames of length 1 ms, each of which includes two slots of length 0.5 ms. Normally, the number of subframes in the radio frame is 0-9; the number of radio frames is 0-1023. As shown in Figure 1.
  • 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.
  • the two PRBs adjacent to each other in the time domain of the subframe are called PRB pairs.
  • a resource corresponding to one subcarrier on each OFDM/SC-FDM symbol is referred to as a Resource Element (RE).
  • RE Resource Element
  • FIG. 2 shows a schematic diagram of network deployment of a cellular wireless communication system.
  • the figure shown may be a 3GPP LTE/LTE-A system, or other cellular wireless communication technology.
  • 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), or an evolved Node B (eNB), or an enhanced node. B (eNB) or other network entity or network element. 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 also includes a low power node (LPN) in the network, such as a femto cell or a home base station (pico, relay, femto, HeNB, etc.), and may also be collectively referred to as a small cell. (small cell).
  • LPN low power node
  • Figure 2 shows only three base stations.
  • the base station provides a certain wireless signal coverage, and a terminal (either a user equipment (UE) or a device) in the coverage area can perform wireless communication with the base station.
  • the radio signal coverage area of a base station may be divided into one or more cell cells or sector sectors based on some criteria, for example, may be three cells.
  • This embodiment provides a device-to-device data packet receiving method, as shown in FIG. 3, including the following steps:
  • Step 110 The first UE receives the D2D data packet sent by the second UE.
  • the first UE may determine, according to an indication in the control signaling sent by the network side device or the second UE, a resource for receiving the D2D data packet, where the D2D data packet sent by the second UE is received.
  • the control signaling sent by the network side device or the second UE carries a parameter for indicating that the D2D data packet is received.
  • the parameter used to indicate receipt of the D2D data packet may be a bitmap indicating the location of the subframe in which the D2D data packet is received.
  • Step 120 The first UE checks the received D2D data packet and sends feedback information for indicating a verification result, where the feedback information is an acknowledgement (ACK) or a negative acknowledgement. , referred to as NACK); if the feedback information is NACK, receive retransmission of the D2D data packet.
  • ACK acknowledgement
  • NACK negative acknowledgement
  • the first UE may send feedback information to the second UE or to the network side device.
  • a subframe in which ACK or NACK (hereinafter referred to as ACK/NACK) feedback information is transmitted is a feedback subframe.
  • the feedback subframe is one of the following subframes: an uplink subframe or a downlink subframe of the cellular communication system, and the uplink of the feedback resource (ie, the feedback information transmission resource) is configured.
  • Subframe or downlink subframe a subframe indicated by the first control signaling.
  • the feedback subframe is one of the following subframes: an uplink subframe of the cellular communication system, and an uplink subframe configured with a feedback resource (ie, a feedback information transmission resource); The subframe indicated by the control signaling.
  • the HARQ feedback information of the D2D data packet is transmitted in the SA period in which the data transmission is located.
  • the rule that each packet in Rel-12 is blindly retransmitted 4 times needs to be redefined: whether the retransmission depends on the received ACK/NACK feedback, if the check result is ACK, no retransmission is needed, if the check result For NACK, feedback information is sent in the feedback subframe.
  • the feedback subframe may be determined according to a preset rule, or may be determined according to an indication in the first control signaling. The following description will be respectively made.
  • the first UE determines the location of the feedback subframe according to a preset rule.
  • the preset rule has a first preset between the feedback subframe and the subframe receiving the D2D data packet. Interval, the first preset interval is a fixed time domain interval.
  • the user equipment receives the D2D data packet in subframe n, it determines that a subframe n+k with a fixed interval k between the D2D data packet is used for transmitting ACK/NACK feedback information, where k is an integer. .
  • k takes a value of 3 or 4 or 5, and so on.
  • the value of k is related to the duplex mode.
  • the values of the frequency division duplex FDD system and the time division duplex TDD system may be different; for the TDD system, the value of k may be a fixed value, or the value of k.
  • the k values of different TDD uplink-downlink configurations may be different.
  • the subframe n and the subframe n+k referred to herein may be for all subframes (such as all uplink subframes or all downlink subframes), or for subframes in a specific subframe set.
  • the actual interval may be different from the k value.
  • the ACK/NACK feedback of the D2D UE has the highest priority, that is, if other transmissions collide, other transmissions are discarded. For example, if the feedback finds that there is a packet that needs to be received, the UE considers this to be an error case; if there is a packet that needs to be sent when the feedback is sent, if it is sent to the same UE, the ACK/NACK can be complexed. After transmission, if it is sent to other UEs, the transmission of other UEs is canceled. among them:
  • the first UE When the first UE has a D2D reception requirement while transmitting the subframe of the feedback information, for example, the determined feedback subframe is n+k, but the control signaling sent by the base station or other UE indicates the subframe n+ k is a D2D reception subframe of the first UE, and the first UE may only transmit ACK/NACK feedback information and abandon D2D reception.
  • the first UE When the first UE has a D2D transmission requirement while transmitting the subframe of the feedback information, for example, the determined feedback subframe is n+k, but the control signaling sent by the base station or other UE indicates the subframe n+ k is a D2D data transmission subframe of the first UE, and the transmitted target UE and the feedback If the target user equipment of the information transmission is different (in this example, the second UE is not the second UE), the first UE may send only the ACK/NACK feedback information and abandon the transmission of the D2D data to the non-feedback information target UE.
  • the first UE When the first UE has a D2D transmission requirement while transmitting the subframe of the feedback information, for example, the determined feedback subframe is n+k, but the control signaling sent by the base station or other UE indicates the subframe n+ k is a D2D data transmission subframe of the first UE, and the target UE to be transmitted is the same as the target UE to which the feedback information is transmitted (in this example, the second UE), and the first UE may use the ACK/NACK
  • the feedback information is multiplexed with the D2D data and sent.
  • the multiplexing mode may be similar to the multiplexing mode of the ACK/NACK information in the Physical Uplink Shared Channel (PUSCH) in the LTE system.
  • PUSCH Physical Uplink Shared Channel
  • the preset rule is that there is a first preset interval between the feedback subframe and the subframe that receives the D2D data packet, and the first preset interval is a minimum time domain interval.
  • a first available feedback subframe that satisfies the minimum time domain interval is determined, and ACK/NACK feedback information is transmitted in the first feedback subframe.
  • the first available feedback subframe refers to a subframe that satisfies at least one of the following conditions: a subframe configured with a feedback information transmission resource or indicated as a feedback information transmission subframe; and a cellular communication data reception that is not the first UE Or transmitting a subframe; a D2D data receiving or transmitting subframe that is not the first UE; and a random access subframe that is not the first UE.
  • the first available feedback subframe is determined to be a subframe position of the feedback information transmission, that is, the UE transmits the feedback information in the first subframe that does not conflict with the D2D transmission/reception.
  • the minimum time domain interval is k (may be a positive integer, such as 3 or 4 or 5, etc.).
  • the first one The ACK/NACK feedback information of the D2D data may be transmitted in a feedback subframe.
  • the subframe transmits ACK/NACK information. Since the first available feedback subframe after the subframe 4 is the subframe 6, the first user equipment transmits the feedback information in the subframe 6.
  • a subframe configured with a feedback information transmission resource refers to a resource configured for network side device configuration or pre-configured for D2D feedback information transmission in the subframe.
  • the feedback information transmission resources may be configured in a partial subframe, such as the network side configuration or pre-configuring a part of the subframes with the feedback information transmission resource, or all the subframes (all downlink subframes, or all uplink subframes) Have this feedback Information transmission resources.
  • Manner 2 The first UE determines the location of the feedback subframe according to the indication in the first control signaling
  • the indication in the first control signaling sent by the eNB or the sending end UE includes a parameter for indicating a location of the feedback subframe or a parameter for indicating a first feedback interval.
  • the first feedback interval may be a fixed time domain interval or a minimum time domain interval, and the first UE determines the location of the feedback subframe according to the indication in the first control signaling. .
  • the subframe in which the ACK/NACK feedback information is sent is a feedback subframe indicated by the first control signaling.
  • the first UE receives the first control signaling sent by the network side device or the second UE, where the first control signaling carries a parameter for indicating a subframe position for transmitting the feedback information;
  • the device sends the feedback information according to the indication of the parameter.
  • a subframe position indicating transmission of the feedback information is indicated by a bitmap;
  • the bitmap may be a bitmap indicating a D2D data transmission subframe (ie, a subframe indicating reception of a D2D data packet) (eg, LTE Release- The T-RPT (Time-Resource Pattern of Transmission) in 12D2D is the same parameter, or it can be a different parameter. If the bitmap is the same parameter as the bitmap indicating the D2D data transmission subframe, it may be agreed that "1" in the bitmap for indicating a specific bit position indicates the position of the feedback information transmission subframe.
  • the last "1" in the bitmap indicates the feedback information transmission subframe position; or, the "1" of the odd (or even) position in the bitmap indicates the feedback information transmission subframe position, wherein the odd position refers to the bitmap position m "1" corresponding subframe position, m is an odd number, or the subframe position corresponding to the mth bit in the bitmap, m is an odd number; or, "1" appearing in the second half of the bitmap indicates feedback information transmission Subframe position (such as bitmap length is 8 bits, the second half refers to the last 4 bits);
  • the subframe for transmitting the ACK/NACK feedback information is determined according to the indication of the first control signaling, where the first control signaling includes a parameter for indicating the first feedback interval.
  • the first user equipment receives the first control signaling sent by the network side device or the second user equipment, where the first control signaling carries a parameter for indicating a first feedback interval, the first feedback
  • the interval represents an interval between the subframe in which the feedback information is transmitted and the data transmission subframe (ie, the subframe in which the first UE receives the D2D data packet); the first UE determines the subframe position of the transmission feedback information according to the interval.
  • the feedback information is transmitted in the subframe.
  • the first feedback interval that is indicated may be similarly defined with the first preset interval in the first mode, that is, the first feedback interval herein may be a fixed time domain interval or a minimum time domain interval, but
  • the difference between the first feedback interval and the foregoing first preset interval is that the first feedback interval is an interval value indicated by the first control signaling, and the first preset interval is predefined or Pre-configured one interval value; after determining the interval value based on the indicated first feedback interval, the manner of determining the feedback subframe may be the same as the foregoing manner of determining the feedback subframe based on the first preset interval.
  • the first control signaling indicating that the first feedback interval is sent by the network side device may be physical layer signaling, such as being carried in DCI (Downlink Control Information); It can also be high-level signaling, such as being carried in dedicated RRC (Radio Resource Control) signaling, or carried in, for example, broadcast signaling (SIB).
  • DCI Downlink Control Information
  • RRC Radio Resource Control
  • the first UE After the first UE receives the D2D data packet and sends the feedback information, if the feedback information is NACK, it waits to receive the retransmission of the data packet. There are three ways to determine the location of a retransmission.
  • Manner 1 After the first UE sends the feedback information, the retransmission and reception are performed according to the scheduling of the network side device or the second UE.
  • the first UE detects second control signaling for scheduling the retransmission of the data packet.
  • the second control signaling may be sent by the base station, for example, the base station sends Downlink Control Information (DCI) to schedule data transmission and retransmission of the D2D link, or is sent by the second UE.
  • DCI Downlink Control Information
  • SCI Sidelink Control Information
  • SA Scheduling Assignment
  • the second control signaling may include part or all of the following parameters: a HARQ process number of the D2D link, a New Data Indicator (NDI), and a redundancy version (RV). a time domain and/or a frequency domain resource allocation parameter of the data retransmission, an Orthogonal Cover Code (OCC), an identifier (Identifier, ID) of the transmitting end (eg, the second UE) of the D2D data packet, The ID of the receiving end (for example, the first UE) of the D2D data packet.
  • OCC Orthogonal Cover Code
  • the D2D data packet transmitting end UE sends the second control signaling, and the second control signaling (SA) for scheduling the D2D data packet retransmission may be sent in the resource for the D2D SA retransmission.
  • SA the second control signaling
  • the SA is transmitted twice in each SA period, then the first transmitted SA is used to schedule the first transmission of the D2D data packet, and the second transmitted SA (that is, the retransmitted SA) is used. Rescheduling the D2D data packet.
  • each SA in the period can be transmitted p times (or at most p times), where The first transmission can be used to schedule the first transmission of the D2D data packet, and the remaining transmissions are used to schedule retransmission of the D2D data packet.
  • the D2D packet is received correctly at the first transmission (ie, the feedback information is ACK), then other D2D packets may be transmitted during the period; or, it is agreed that only one D2D packet will be transmitted in each cycle, if the first transmission is performed. The D2D packet is received correctly, and it is necessary to wait until the next cycle to transfer other D2D packets.
  • the other transmission subframes corresponding to the HARQ process in the cycle may continue to perform other The transmission of the D2D data packet; or, it is agreed that only one D2D data packet is transmitted for each HARQ process in each period. If the D2D data packet is received correctly at the first transmission, the next period is required to be in the subframe corresponding to the HARQ process. Perform other D2D packet transmissions.
  • the p value can be fixed, for example, regardless of the SA period, the p value takes the phase. Or, the p value is determined according to the size of the SA period. For example, when the SA period is 40 ms, the p value is 4, and when the SA period is 80 ms, the p value is 8, and so on.
  • the second control signaling carries a new data indication, which is used to indicate the first transmission or the retransmission, and the number of bits indicated by the new data may be determined according to the number of determinable HARQ processes. For example, a maximum of eight HARQ processes can be scheduled, and the length of the NDI indication signaling is 8 bits, and each bit corresponds to one HARQ process.
  • the new data indication may also be used in combination with the bitmap indicating the HARQ process, for example, by using an 8-bit bitmap to indicate whether the corresponding HARQ process has data scheduled, and then determining, according to the NDI, whether the scheduled HARQ process is a first transmission or a retransmission.
  • the first pass or retransmission may also be implicitly indicated by RV.
  • the RV order of the contracted data packet transmission is [0213], and the first transmission of the D2D data packet is indicated when the indicated RV version is 0, and the second transmission of the D2D data packet is indicated when the RV version is 1. That is, the first retransmission), and so on.
  • the second control signaling includes a time domain and/or a frequency domain resource allocation parameter of data retransmission, and the D2D data packet is transmitted in a time domain and/or a frequency domain resource indicated by the resource allocation parameter.
  • the time domain and/or the frequency domain resource allocation parameter of the data retransmission is not included in the second control signaling, the time domain and/or the frequency domain resource of the D2D data packet transmission is the same as the location of the first transmission. If the time domain resource allocation parameter is not included, the time domain resource in the D2D data packet retransmission is the same as the first transmission; if the frequency domain resource allocation parameter is not included, the frequency domain resource in the D2D data packet retransmission is the same as the first transmission; And so on.
  • the same time domain means that the subframe in which the D2D data packet is transmitted is a subframe corresponding to the same HARQ process (here, the HARQ process refers to a D2D HARQ process, or a cellular communication HARQ process, such as a cellular link uplink. HARQ process); or, means that the subframe in which the D2D data packet is transmitted is in the same position in the transmission period, for example, the first transmission is in the first subframe in the transmission period, and then the retransmission is in the next transmission period. In the first subframe, the transmission period can be kept the same as the SA period, or the SA period can be divided.
  • the same frequency domain means that the frequency domain location for transmitting the D2D data packet is the same as the frequency domain location used for the initial transmission or the last transmission, or according to the location of the initial transmission or the last transmission and the frequency hopping rule. determine.
  • Manner 2 After the first UE sends the feedback information, if the feedback information is NACK, the retransmission is strictly performed synchronously, that is, the first UE receives the retransmission of the D2D data packet in the same HARQ process, and the HARQ RTT (Round Trip Time) , round trip time) is fixed;
  • the HARQ transmission adopts a synchronous HARQ transmission mode, and the synchronization means that the subframe position of the multiple data transmission corresponding to the same HARQ process is fixed.
  • the first UE receives retransmission of the D2D data in a subframe corresponding to the same HARQ process. If the control signaling includes a parameter indicating the HARQ process number, the retransmission has the same HARQ process number as the first transmission.
  • the subframe corresponding to the same HARQ process is a subframe corresponding to the HARQ process of the cellular communication uplink transmission.
  • a subframe with 8 subframes belongs to the same HARQ process, for example, subframe n, subframe n+8, subframe n+16, ... belong to the same HARQ process. Therefore, when the check result of the D2D data packet received by the UE in the subframe n is NACK, the data packet is retransmitted in the subframe n+8, and the transmitting end and the receiving end UE respectively transmit the sum in the subframe n+8. Receiving a retransmission of the D2D data packet.
  • the subframe corresponding to the same HARQ process is a subframe corresponding to the HARQ process of the D2D communication.
  • the number of HARQ processes of the D2D link is N
  • the number of D2D subframes is 0, 1, 2, ...
  • D2D subframes may be all subframes within a certain start and end range, for example, all downlink subframes or All uplink subframes may also be partial subframes allocated in a cellular communication resource, for example, a part of a cellular uplink subframe is allocated as a D2D subframe, and the number of the D2D subframes is modulo N, and the same subframe is obtained. Belongs to the same D2D HARQ process.
  • the D2D link HARQ process number N 6, then for example, the D2D subframes numbered 1, 7, 13, ... belong to the same HARQ process. Therefore, when the check result of the D2D data packet transmitted in the D2D subframe 1 is NACK, the transmitting end of the D2D data packet performs retransmission of the D2D data packet in the D2D subframe 7, and the receiving end is The reception of the D2D data packet is performed in subframe 7.
  • the subframe of the D2D data transmission is indicated by using a bitmap, where each bit in the bitmap corresponds to one HARQ process.
  • the bitmap length is M
  • each bit in the bitmap corresponds to a set of 1 subframe.
  • the numbering modulo M of the D2D subframes corresponds to the result of the modulo mapping in the bitmap.
  • the retransmission position of the D2D data is determined according to the location of the feedback subframe and the second preset interval, and the retransmission reception is performed synchronously, where the second preset interval is the feedback sub
  • the second preset interval is the feedback sub
  • the interval between the frame and the retransmission subframe of the D2D data packet, the second preset interval is a fixed time domain interval, and the first UE receives the retransmission of the D2D data packet at the retransmission position of the D2D data (ie, under Receiving a retransmission in a subframe (or an available subframe) that satisfies the second preset interval;
  • the retransmission position of the D2D data is determined according to a subframe position transmitted by the feedback information, for example, the device to device communication is sent in a D2D subframe having a second predetermined interval with the feedback subframe.
  • the second predetermined interval may be a fixed interval value; the D2D subframe may be all subframes (such as all uplink subframes within a specific start and end range), or configured for D2D data transmission. Subframe. If the D2D subframe is all subframes, the D2D data packet is transmitted in a subframe having a fixed interval from the feedback information transmission subframe.
  • the D2D data packet is in a first (available) D2D data transmission subframe after a fixed interval of the feedback information transmission subframe Medium transmission; at this time, the fixed interval only calculates the subframe of the D2D data transmission, or calculates all the subframes, for example, all the uplink subframes.
  • the fixed interval only calculates the subframe of the D2D data transmission, that is, the D2D data packet is in the first (available) D2D data transmission subframe after the fixed interval D2D data transmission subframe of the feedback information transmission subframe.
  • fixed interval calculation of all uplink subframes means that the D2D data packet is in a fixed interval subframe of the feedback information transmission subframe (all uplink subframes, including the configured D2D data transmission subframe) A (available) D2D data transmission is transmitted in a sub-frame.
  • the first UE may receive the D2D data packet and the retransmission of the D2D data packet in the subframe indicated by the bitmap, and the indication manner of the bitmap is referred to the above description, each bit in the bitmap Corresponds to a HARQ process.
  • This embodiment provides a D2D data packet sending method, as shown in FIG. 4, including the following steps:
  • Step 210 The second UE transmits a D2D data packet to the first UE.
  • the second UE may transmit the D2D data packet to the first UE according to the scheduling of the base station.
  • Step 220 When the second UE receives the feedback information sent by the first UE to indicate the verification result and the feedback information is a NACK, or receives the authorization information sent by the network side device to indicate the retransmission of the D2D data packet. Retransmitting the D2D data packet to the first UE.
  • This embodiment is a transmission method corresponding to the receiving method of the first embodiment.
  • the two methods have the corresponding correspondence.
  • the subframe in which the first UE sends the feedback information is a feedback subframe. There are two ways to determine the position of the feedback subframe:
  • Manner 1 The second UE determines the location of the feedback subframe according to a preset rule, and receives the feedback information in the feedback subframe.
  • the preset rule has a first preset interval between the feedback subframe and a subframe in which the D2D data packet is sent, where the first preset interval is a fixed time interval or a minimum time interval.
  • the second UE determines a feedback subframe position according to the subframe position of the D2D data packet and the first preset interval.
  • the first preset interval preset for UE2 is the same as the first preset interval preset for UE1. For details, refer to the description and examples of the first preset interval in the first embodiment.
  • the second UE determines that the second available feedback subframe that satisfies the minimum time domain interval is a feedback subframe that receives feedback information, and the second available feedback subframe Refers to a subframe that satisfies at least one of the following conditions: a feedback information transmission resource is configured, a D2D data reception or transmission subframe that is not the second UE, and a random access subframe that is not the second UE.
  • Manner 2 The second UE determines the location of the feedback subframe according to the indication in the first control signaling, and receives the feedback information in the feedback subframe.
  • the indication in the first control signaling includes a parameter for indicating the location of the feedback subframe, or a parameter for indicating a first feedback interval, the feedback subframe and a subframe for transmitting the D2D data packet
  • a first feedback interval is a fixed time domain interval or a minimum time domain interval
  • the second UE determines a location of the feedback subframe according to an indication in the first control signaling.
  • the second UE determines that the second available feedback subframe that satisfies the minimum time domain interval is a feedback subframe that receives feedback information.
  • the second UE retransmits the D2D data packet to the first UE in one of the following manners:
  • the second UE determines, according to the second control signaling sent by the network side device, a resource for D2D data packet retransmission, and retransmits the D2D data packet in the resource for D2D data packet retransmission.
  • the base station sends a DCI scheduling D2D data retransmission
  • the DCI may carry part or all of the following parameters for indicating the retransmission resource location of the D2D data packet: the HARQ process number, the new data indicating the NDI, the redundancy version RV, and the data retransmission.
  • Time domain and / or frequency domain resource allocation parameters See the description in the first embodiment.
  • the second UE determines a resource for D2D data packet retransmission, and sends, to the first UE, second control signaling for scheduling the D2D data packet retransmission, where the data is used for D2D data.
  • the D2D data packet is retransmitted in the resource retransmitted by the packet.
  • the second UE may determine, according to the scheduling of the network side, the resource for D2D data packet retransmission, and send, to the first UE, the second UE for scheduling the D2D data packet retransmission in the resource for the D2D scheduling and the SA retransmission. Controlling signaling, while the second UE retransmits the D2D data packet on the retransmission resource indicated by the second control signaling.
  • the second UE retransmits the D2D data packet in the same HARQ process, and the subframe corresponding to the same HARQ process is a subframe corresponding to the HARQ process of the cellular communication uplink transmission or is a D2D communication. a subframe corresponding to the HARQ process;
  • the second UE determines a retransmission position of the D2D data according to the location of the feedback subframe and the second preset interval, where the second preset interval is a retransmission subframe of the feedback subframe and the D2D data packet.
  • the second preset interval is a fixed time domain interval, and the second UE retransmits the D2D data packet at the retransmission position of the D2D data.
  • the second preset interval preset for UE2 is the same as the second preset interval preset for UE1.
  • the second preset interval preset for UE1 refers to the description and examples of the second preset interval in the first embodiment.
  • the second UE sends a D2D data packet in a subframe indicated by the bitmap and The D2D data packet is retransmitted, and each bit in the bitmap corresponds to one HARQ process.
  • the second UE may use a non-adaptive retransmission mode when retransmitting the D2D data packet.
  • the RV may adopt a fixed RV order; the frequency domain resource location may be the same as the first transmission, or may be determined according to the first-pass frequency domain resource location and frequency hopping rules.
  • This embodiment provides a D2D communication scheduling method, as shown in FIG. 5, including:
  • Step 310 The network side device sends the first authorization information to the second UE, where the first authorization information is used to schedule the second UE to send the D2D data packet to the first UE.
  • Step 320 Receive feedback information sent by the first UE to indicate the D2D data packet check result, where the feedback information is ACK or NACK;
  • Step 330 If the received feedback information is a NACK, send the second authorization information to the second UE, where the second authorization information is used to schedule the second UE to retransmit the D2D data packet.
  • the network side device determines, in the subframe that has the first preset interval between the subframes that send the D2D data packet, the feedback subframe that sends the feedback information to the first UE, where the first preset interval is The network side device receives the feedback information sent by the first UE in the feedback subframe in the fixed time domain interval or the minimum time domain interval.
  • the feedback subframe is an uplink subframe or a downlink subframe of the cellular communication system, or an uplink subframe or a downlink subframe configured with a feedback resource, or the subframe in which the ACK/NACK feedback information is sent is the authorization information.
  • the indicated feedback subframe is an uplink subframe or a downlink subframe of the cellular communication system, or an uplink subframe or a downlink subframe configured with a feedback resource, or the subframe in which the ACK/NACK feedback information is sent is the authorization information.
  • the indicated feedback subframe is an uplink subframe or a downlink subframe of the cellular communication system, or an uplink
  • the network side device determines a subframe that is separated from the subframe in which the first UE sends the D2D data packet by a fixed time interval, and is a feedback subframe that receives feedback information; The feedback information is transmitted in the feedback resource of the feedback subframe; or the feedback information is multiplexed and transmitted in the cellular communication data or the cellular link uplink feedback information sent by the first UE to the network side device.
  • the network side device determines that the third available feedback subframe that meets the minimum time domain interval of the subframe in which the first UE transmits the D2D data packet is a feedback sub-received feedback information.
  • the third available feedback subframe is referred to as satisfying the following a subframe of at least one of the conditions: configured with a feedback information transmission resource, a D2D data receiving or transmitting subframe that is not the first UE, and a D2D data receiving or transmitting subframe that is not the second UE, and a non-random access subframe frame.
  • the method further includes the following steps: the network side device sends a second control signaling to the first UE, where the second control signaling is used to schedule the first UE to receive a D2D Retransmission of the data packet; the second control signaling includes part or all of the following parameters for indicating retransmission of the D2D data packet: HARQ process number, new data indicating NDI, redundancy version RV, data retransmission Time domain and / or frequency domain resource allocation parameters.
  • the transmission of the feedback information and the retransmission of the D2D data packet refer to the foregoing embodiment.
  • the embodiment provides a system for device-to-device communication, including: a network side device of a cellular network, a first user equipment, and a second user equipment.
  • a network side device of a cellular network including: a network side device of a cellular network, a first user equipment, and a second user equipment.
  • the network side device of the cellular network may be a base station as described in the previous examples.
  • the network side device includes a scheduling device as shown in FIG. 6.
  • the device may include at least: a first scheduling module 410, a feedback information receiving module 420, and a second scheduling module 430, where:
  • the first scheduling module 410 is configured to: send first authorization information to the second UE, where the first authorization information is used to schedule the second UE to send a D2D data packet to the first UE;
  • the feedback information receiving module 420 is configured to: receive feedback information sent by the first UE to indicate the D2D data packet verification result, where the feedback information is an acknowledgement ACK or a non-acknowledgement NACK;
  • the second scheduling module 430 is configured to: when the feedback information received by the feedback information receiving module 420 is a NACK, send second authorization information to the second UE, where the second authorization information is used for scheduling The second UE retransmits the D2D data packet.
  • the subframe in which the first UE sends the feedback information is a feedback subframe, where the feedback subframe is an uplink subframe or a downlink subframe of the cellular communication system, or an uplink subframe or a downlink configured with a feedback resource.
  • the subframe, or the subframe in which the ACK/NACK feedback information is sent, is a feedback subframe indicated by the grant information.
  • the feedback information receiving module 420 determines a subframe that has a first preset interval between the subframes that send the D2D data packet, and sends a feedback subframe for the first UE, where the first pre- The feedback information receiving module 420 receives the feedback information sent by the first UE in the feedback subframe by setting the interval to a fixed time domain interval or a minimum time domain interval.
  • the feedback information receiving module 420 determines that the subframe that is a fixed time interval of the subframe interval of the D2D data packet sent by the first UE is a feedback subframe that receives feedback information; or,
  • the feedback information receiving module 420 determines that the third available feedback subframe that meets the minimum time domain interval of the subframe in which the first UE transmits the D2D data packet is the receiving feedback.
  • a feedback subframe of the information where the third available feedback subframe refers to a subframe that satisfies at least one of the following conditions: a feedback information transmission resource is configured, and the D2D data is not received or transmitted by the first UE,
  • the D2D data receiving or transmitting subframe of the second UE is a non-random access subframe.
  • the second scheduling module 430 is further configured to: send, to the first UE, second control signaling, where the second control signaling is used by the scheduling device.
  • the first UE receives the retransmission of the D2D data packet;
  • the second control signaling includes part or all of the following parameters, and is used to indicate the retransmission of the D2D data packet: the HARQ process number, the new data indicating the NDI, and the redundancy version. RV, time domain and/or frequency domain resource allocation parameters for data retransmission.
  • the network side device may be a base station (base station or eNB), or other network access device, such as a small cell, or may be a higher layer network node, such as a gateway, or a mobility management entity.
  • base station base station or eNB
  • MME Mobility Management Entity
  • the network side device may also be a network unit temporarily deployed in an uncovered scenario.
  • the uncovered scenario refers to a scenario where the user equipment is in a blind spot of the cellular network coverage, such as a damaged cellular infrastructure, or covering a hollow area, and the like.
  • the network side device may also be a UE that acts as a cluster head or a primary UE, for example, in a specific scenario, such as a scenario without network coverage, by a specific user equipment. Discover the configuration of the resource.
  • the first UE includes the receiving device as shown in FIG. 7, and the receiving device may at least include: a first D2D data packet receiving module 510, a check module 520, a first sending module 530, and a second D2D.
  • a packet receiving module 540 wherein:
  • the first D2D data packet receiving module 510 is configured to: receive a D2D data packet sent by the second UE;
  • the verification module 520 is configured to: verify the D2D data packet
  • the first sending module 530 is configured to: send feedback information indicating a check result, where the feedback information is an acknowledgement ACK or a non-acknowledgement NACK;
  • the second D2D data packet receiving module 540 is configured to: when the feedback information is a NACK, receive a retransmission of the D2D data packet.
  • the subframe in which the feedback information is sent is a feedback subframe
  • the first sending module 530 is further configured to: determine a location of the feedback subframe according to a preset rule to determine a location of the feedback subframe.
  • the preset rule has a first preset interval between the feedback subframe and a subframe that receives the D2D data packet, where the first preset interval is a fixed time domain interval or a minimum time domain interval.
  • the first sending module 530 determines the location of the feedback subframe according to the subframe position of receiving the D2D data packet and the first preset interval.
  • the device further includes: a determining module 550, configured to: after the first sending module 530 determines the feedback subframe position according to the subframe position of receiving the D2D data packet and the first preset interval, Determining that if the determined feedback subframe has a D2D data reception requirement, notifying the first D2D data packet receiving module 510 and the second D2D data packet receiving module 540 to abandon D2D data reception; determining if the determined feedback subframe When there is a D2D data transmission request and the target UE that is sent by the D2D data is not the second UE, the first sending module 530 is notified to abandon the D2D data transmission; and if there is a D2D data transmission requirement in the determined feedback subframe, When the target UE that sends the D2D data is the second UE, notify the first sending module 530 to use the feedback.
  • the information is multiplexed with the D2D data and sent in a feedback subframe.
  • the first transceiver module 530 determines that the first available feedback subframe that meets the minimum time domain interval is a feedback subframe that sends feedback information, where
  • An available feedback subframe refers to a subframe that satisfies at least one of the following conditions: a subframe configured with a feedback information transmission resource or indicated as a feedback information transmission subframe, and a cellular communication data reception or transmission that is not the first UE
  • the frame is not a D2D data receiving or transmitting subframe of the first UE, and is not a random access subframe of the first UE.
  • the first sending module 530 is further configured to: determine a location of the feedback subframe according to an indication in the first control signaling.
  • the indication in the first control signaling includes a parameter for indicating a location of the feedback subframe, or a parameter for indicating a first feedback interval, where the first feedback interval is a feedback subframe and a sub-received D2D data packet.
  • the interval of the frame, the first feedback interval is a fixed time domain interval or a minimum time domain interval, and the first sending module 530 determines the location of the feedback subframe according to the indication in the first control signaling.
  • the first transceiver module 530 determines that the first available feedback subframe that meets the minimum time domain interval is a feedback subframe that sends feedback information.
  • the second D2D data packet receiving module 540 receives the retransmission of the D2D data packet in one of the following manners:
  • the second D2D data packet receiving module 540 receives the retransmission of the D2D data packet according to the scheduling of the network side device or the second UE.
  • the second D2D data packet receiving module 540 receives the second control signaling sent by the network side device or the second control signaling sent by the second UE in the resource for D2D SA retransmission, where the second control signaling is used. And for scheduling the retransmission of the D2D data packet, the second D2D data packet receiving module receives the retransmission of the D2D data packet according to the indication of the second control signaling.
  • the second control signaling includes part or all of the following parameters for indicating retransmission of the D2D data packet: the HARQ process number, the new data indicating the NDI, the redundancy version RV, and the time domain and/or frequency of the data retransmission. Domain resource allocation parameters.
  • the second D2D data packet receiving module 540 is in the same hybrid automatic retransmission Receiving retransmission of D2D data packets in the HARQ process;
  • the second D2D data packet receiving module 540 receives the retransmission of the D2D data in a subframe corresponding to the same HARQ process, where the subframe corresponding to the same HARQ process is a HARQ process of cellular communication uplink transmission.
  • the corresponding subframe is either a subframe corresponding to the HARQ process of D2D communication.
  • the second D2D data packet receiving module 540 determines a retransmission position of the D2D data according to the location of the feedback subframe and the second preset interval, where the second preset interval is the feedback subframe and the D2D.
  • the interval of the retransmission subframe of the data packet, the second preset interval is a fixed time domain interval, and the second D2D data packet receiving module 540 receives the retransmission of the D2D data packet at the retransmission position of the D2D data.
  • the first D2D data packet receiving module 510 receives the D2D data packet sent by the second UE, including: the first D2D data packet receiving module 510 receives the D2D data packet in a subframe indicated by the bitmap;
  • the second D2D data packet receiving module 540 receives the retransmission of the D2D data packet, including: the second D2D data packet receiving module 540 receives the retransmission of the D2D data packet in a subframe indicated by the bitmap
  • Each bit in the bitmap corresponds to one HARQ process.
  • the second UE is the sending device shown in FIG. 8, and the sending device may at least include: a transmitting module 610 and a retransmission module 620, where:
  • the transmitting module 610 is configured to: transmit a D2D data packet to the first UE;
  • the retransmission module 620 is configured to: when receiving feedback information for indicating a verification result sent by the first UE, and the feedback information is a non-acknowledgement NACK, or receiving the D2D data sent by the network side device The packet retransmitted authorization information retransmits the D2D data packet to the first UE.
  • the subframe in which the first UE sends the feedback information is a feedback subframe.
  • the retransmission module 620 determines a location of the feedback subframe according to a preset rule, and receives the feedback information in the feedback subframe.
  • the preset rule has a first preset interval between the feedback subframe and a subframe in which the D2D data packet is sent, where the first preset interval is a fixed time interval or a minimum time interval
  • the retransmission module 620 determines the feedback subframe position according to the subframe position of the D2D data packet and the first preset interval.
  • the retransmission module 620 determines that the second available feedback subframe that meets the minimum time domain interval is a feedback subframe that receives feedback information, and the second available feedback A subframe is a subframe that satisfies at least one of the following conditions: a feedback information transmission resource is configured, and a D2D data reception or transmission subframe that is not the second UE is not a random access subframe of the second UE.
  • the retransmission module 620 determines a location of the feedback subframe according to an indication in the first control signaling, and receives the feedback information in the feedback subframe.
  • the indication in the first control signaling includes a parameter for indicating the location of the feedback subframe, or a parameter for indicating a first feedback interval, the feedback subframe and a subframe for transmitting the D2D data packet There is a first feedback interval between the first feedback interval being a fixed time domain interval or a minimum time domain interval, and the retransmission module 620 determines the location of the feedback subframe according to the indication in the first control signaling.
  • the retransmission module 620 determines that the second available feedback subframe that satisfies the minimum time domain interval is a feedback subframe that receives feedback information.
  • the retransmission module 620 retransmits the D2D data packet to the first UE in the following manner:
  • the retransmission module 620 determines a resource for D2D data packet retransmission according to the second control signaling sent by the network side device, and retransmits the D2D data in the resource for D2D data packet retransmission. package;
  • the retransmission module 620 determines a resource for D2D data packet retransmission, and sends a second control signaling for scheduling the D2D data packet retransmission to the first UE, where the function is used for D2D
  • the D2D data packet is retransmitted in the resource retransmitted by the data packet.
  • the retransmission module 620 sends, to the first UE, second control signaling for scheduling the D2D data packet retransmission in the resource for the D2D scheduling allocation SA retransmission, where the retransmission module 620 is The D2D data packet is retransmitted on the retransmission resource indicated by the second control signaling.
  • the second control signaling includes part or all of the following parameters, and is used to indicate retransmission of the D2D data packet: The HARQ process number, the new data indicates the NDI, the redundancy version RV, the time domain and/or the frequency domain resource allocation parameters of the data retransmission.
  • the retransmission module 620 retransmits the D2D data packet in the same hybrid automatic retransmission HARQ process, and the subframe corresponding to the same HARQ process is a sub-field corresponding to the HARQ process of the cellular communication uplink transmission. a frame or a subframe corresponding to a HARQ process of D2D communication;
  • the retransmission module 620 determines a retransmission position of the D2D data according to the location of the feedback subframe and the second preset interval, where the second preset interval is a retransmission of the feedback subframe and the D2D data packet.
  • An interval between frames, the second preset interval is a fixed time domain interval, and the retransmission module retransmits the D2D data packet at a retransmission position of the D2D data.
  • the transmitting module 610 transmits the D2D data packet to the first UE, including: the transmitting module 610 sends a D2D data packet in a subframe indicated by the bitmap; the retransmission module 620 is to the first Retransmitting the D2D data packet by the UE, including the retransmission module 620 retransmitting the D2D data packet in a subframe indicated by the bitmap; each bit in the bitmap corresponds to one HARQ process.
  • all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve.
  • the devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.
  • the device/function module/functional unit in the above embodiment When the device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium.
  • the above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the embodiment of the present invention can implement the implementation of the existing D2D communication as much as possible, and can introduce the HARQ ACK/NACK feedback and the feedback based retransmission based on the existing D2D transmission mode without significantly increasing the terminal implementation complexity and signaling overhead.
  • the D2D unicast communication improves the spectral efficiency of D2D through HARQ-based unicast communication and expands the application range of D2D communication.

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Abstract

本文公布一种D2D发送、接收、调度方法和相应装置，接收方法：UE1接收UE2发送的D2D数据包；UE1对该D2D数据包进行校验并发送表示校验结果的反馈信息，反馈信息为ACK或NACK，若反馈信息是NACK，则接收D2D数据包的重传。发送方法：UE2向UE1传输D2D数据包；当UE2接收到UE1发送反馈信息为NACK，或者接收到网络侧设备发送的授权信息，向UE1重传输D2D数据包。调度方法：网络侧设备向UE2发送第一授权信息，调度UE2向UE1发送D2D数据包；若网络侧设备接收到UE1发送的反馈信息是NACK，向UE2发送第二授权信息，调度UE2重传输D2D数据包。

Description

一种设备到设备发送、接收、调度方法和相应装置 技术领域
本申请涉及但不限于无线通信领域。
背景技术
随着移动通信业务的多样化，例如，社交网络、电子支付等应用在无线通信系统中的普及，使得近距离用户之间的业务传输需求日益增长。因此，设备到设备(Device-to-Device，简称为D2D)的通信模式日益受到广泛关注。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(User Equipment，简称为UE)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。
无线通信通常包括广播(broadcast)、组播(groupcast)、单播(unicast)等通信模式。广播通常没有特定的接收端，例如对发送端发送的业务感兴趣的设备都可以接收该业务；组播是另一种一对多通信，组成一个通信组的终端可以接收到发送端所发送的业务；单播则是将业务发送给特定的一个接收端。LTE Rel-12在物理层定义了D2D广播通信。LTE Rel-12的广播通信包括两种通信模式：mode 1和mode 2。前者是基于eNB调度的广播通信；后者由UE在D2D通信资源池中自主选择资源进行D2D传输。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
D2D广播通信的特点是没有HARQ ACK反馈，而对于单播通信来说，这种方式显然不是最优的。
本文提供一种设备到设备发送、接收、调度方法和相应装置，实现HARQ反馈，提高D2D通信的传输效率。
一种设备到设备D2D数据包接收方法，包括：
第一用户设备UE接收第二UE发送的D2D数据包；
第一UE对接收到的所述D2D数据包进行校验并发送用于表示校验结果的反馈信息，所述反馈信息为确认ACK或非确认NACK，如果所述反馈信息是NACK，则接收所述D2D数据包的重传。
可选地，发送反馈信息的子帧为反馈子帧，所述方法还包括：所述第一UE根据预先设置的规则确定所述反馈子帧的位置或者根据第一控制信令中的指示确定所述反馈子帧的位置。
可选地，所述第一UE根据预先设置的规则确定所述反馈子帧的位置，包括：所述预先设置的规则为所述反馈子帧与接收所述D2D数据包的子帧之间具有第一预设间隔，所述第一预设间隔为固定时域间隔或者为最小时域间隔，所述第一UE根据接收所述D2D数据包的子帧位置以及所述第一预设间隔确定所述反馈子帧的位置。
可选地，所述第一UE根据接收所述D2D数据包的子帧位置以及所述第一预设间隔确定反馈子帧位置时，所述方法还包括：当在确定的反馈子帧有D2D数据接收需求时，所述第一UE放弃D2D数据接收；当在确定的反馈子帧有D2D数据发送需求且所述D2D数据发送的目标UE非所述第二UE时，所述第一UE放弃D2D数据发送；当在确定的反馈子帧有D2D数据发送需求且所述D2D数据发送的目标UE为所述第二UE时，所述第一UE将所述反馈信息与所述D2D数据复用后在反馈子帧发送。
可选地，所述第一UE根据第一控制信令中的指示确定所述反馈子帧的位置，包括：所述第一控制信令中的指示包括用于指示反馈子帧位置的参数，或者包括用于指示第一反馈间隔的参数，所述反馈子帧与接收所述D2D数据包的子帧之间具有第一反馈间隔所述第一反馈间隔为固定时域间隔或者为最小时域间隔，所述第一UE根据所述第一控制信令中的指示确定所述反馈子帧的位置。
可选地，所述第一UE根据最小时域间隔确定所述反馈子帧的位置，包括：确定满足所述最小时域间隔的第一可用反馈子帧为发送反馈信息的反馈 子帧，所述第一可用反馈子帧是指满足以下条件至少之一的子帧：配置有反馈信息传输资源或者被指示为反馈信息传输子帧的子帧，非所述第一UE的蜂窝通信数据接收或发送子帧，非所述第一UE的D2D数据接收或发送子帧，非所述第一UE的随机接入子帧。
可选地，所述第一UE接收所述D2D数据包的重传，包括：所述第一UE根据网络侧设备或者第二UE的调度接收所述D2D数据包的重传；或者，所述第一UE在同一个混合自动重传HARQ进程中接收D2D数据包的重传；或者，所述第一UE根据所述反馈子帧的位置以及第二预设间隔确定D2D数据的重传位置，所述第二预设间隔为固定时域间隔，所述第一UE在所述D2D数据的重传位置接收D2D数据包的重传。
可选地，所述第一UE根据网络侧设备或者第二UE的调度接收所述D2D数据包的重传，包括：所述第一UE接收网络侧设备发送的第二控制信令或者第二UE在用于D2D调度分配SA重传的资源发送的第二控制信令，所述第二控制信令用于调度所述D2D数据包的重传，所述第一UE按照所述第二控制信令的指示接收所述D2D数据包的重传。
可选地，所述第二控制信令中包括以下参数的部分或者全部，用于指示D2D数据包的重传：HARQ进程号，新数据指示NDI，冗余版本RV，数据重传的时域和/或频域资源分配参数。
可选地，所述第一UE在同一个混合自动重传HARQ进程中接收D2D数据包的重传，包括：所述第一UE在同一个HARQ进程所对应的子帧中接收所述D2D数据的重传，所述同一个HARQ进程所对应的子帧为蜂窝通信上行传输的HARQ进程所对应的子帧或者为D2D通信的HARQ进程所对应的子帧。
可选地，所述第一UE接收第二UE发送的D2D数据包，包括：所述第一UE在位图指示的子帧接收D2D数据包；所述第一UE接收所述D2D数据包的重传，包括：所述第一UE在所述位图指示的子帧接收所述D2D数据包的重传；所述位图中每个比特对应一个HARQ进程。
一种D2D数据包接收装置，包括第一D2D数据包接收模块、校验模块、第一发送模块和第二D2D数据包接收模块，其中：
所述第一D2D数据包接收模块，设置为：接收第二UE发送的D2D数据包；
所述校验模块，设置为：对所述D2D数据包进行校验；
所述第一发送模块，设置为：发送用于表示校验结果的反馈信息，所述反馈信息为确认ACK或非确认NACK；
所述第二D2D数据包接收模块，设置为：在所述反馈信息是NACK时，接收所述D2D数据包的重传。
一种D2D数据包发送方法，包括：
第二UE向第一UE传输D2D数据包；
当接收到所述第一UE发送的用于表示校验结果的反馈信息且反馈信息为非确认NACK，或者接收到网络侧设备发送的用于指示D2D数据包重传的授权信息，向所述第一UE重传输所述D2D数据包。
可选地，所述第一UE发送反馈信息的子帧为反馈子帧，所述方法还包括：所述第二UE根据预先设置的规则确定所述反馈子帧的位置或者根据第一控制信令中的指示确定所述反馈子帧的位置，在所述反馈子帧接收所述反馈信息。
可选地，所述第二UE根据预先设置的规则确定所述反馈子帧的位置，包括：所述预先设置的规则为所述反馈子帧与发送所述D2D数据包的子帧之间具有第一预设间隔，所述第一预设间隔为固定时域间隔或者为最小时域间隔，所述第二UE根据发送所述D2D数据包的子帧位置以及所述第一预设间隔确定反馈子帧位置。
可选地，所述第二UE根据第一控制信令中的指示确定所述反馈子帧的位置，包括：所述第一控制信令中的指示包括用于指示所述反馈子帧位置的参数，或者包括用于指示第一反馈间隔的参数，所述反馈子帧与发送所述D2D数据包的子帧之间具有第一反馈间隔，所述第一反馈间隔为固定时域间 隔或者为最小时域间隔，所述第二UE根据第一控制信令中的指示确定所述反馈子帧的位置。
可选地，所述第二UE根据最小时域间隔确定所述反馈子帧的位置，包括：确定满足所述最小时域间隔的第二可用反馈子帧为接收反馈信息的反馈子帧，所述第二可用反馈子帧是指满足以下条件至少之一的子帧：配置有反馈信息传输资源，非所述第二UE的D2D数据接收或发送子帧，非所述第二UE的随机接入子帧。
可选地，所述向所述第一UE重传输所述D2D数据包，包括：所述第二UE根据网络侧设备发送的第二控制信令确定用于D2D数据包重传的资源，在所述用于D2D数据包重传的资源中重传输所述D2D数据包；或者，所述第二UE确定用于D2D数据包重传的资源，向所述第一UE发送用于调度所述D2D数据包重传的第二控制信令，在所述用于D2D数据包重传的资源中重传输所述D2D数据包。
可选地，所述向所述第一UE重传输所述D2D数据包，包括：所述第二UE在同一个混合自动重传HARQ进程中重传输所述D2D数据包，所述同一个HARQ进程所对应的子帧为蜂窝通信上行传输的HARQ进程所对应的子帧或者为D2D通信的HARQ进程所对应的子帧；或者，所述第二UE根据反馈子帧的位置以及第二预设间隔确定D2D数据的重传位置，所述第二预设间隔为所述反馈子帧与D2D数据包的重传子帧之间的间隔，所述第二预设间隔为固定时域间隔，所述第二UE在所述D2D数据的重传位置重传输所述D2D数据包。
可选地，所述第二UE确定用于D2D数据包重传的资源，向所述第一UE发送用于调度所述D2D数据包重传的第二控制信令，在所述用于D2D数据包重传的资源中重传输所述D2D数据包，包括：所述第二UE在用于D2D调度分配SA重传的资源向所述第一UE发送用于调度所述D2D数据包重传的第二控制信令，所述第二UE在所述第二控制信令指示的重传资源上重传输所述D2D数据包。
可选地，所述第二控制信令中包括以下参数的部分或者全部，用于指示D2D数据包的重传：HARQ进程号，新数据指示NDI，冗余版本RV，数据 重传的时域和/或频域资源分配参数。
可选地，所述第二UE向第一UE传输D2D数据包，包括：所述第二UE在位图指示的子帧发送D2D数据包；所述第二UE向所述第一UE重传输所述D2D数据包，包括：所述第二UE在所述位图指示的子帧重传输所述D2D数据包；所述位图中每个比特对应一个HARQ进程。
一种设备到设备D2D数据包发送装置，包括传输模块和重传输模块，其中：
所述传输模块，设置为：向第一UE传输D2D数据包；
所述重传输模块，设置为：当接收到所述第一UE发送的用于表示校验结果的反馈信息且反馈信息为非确认NACK，或者接收到网络侧设备发送的用于指示D2D数据包重传的授权信息，向所述第一UE重传输所述D2D数据包。
一种D2D通信调度方法，包括：
网络侧设备向第二用户设备UE发送第一授权信息，所述第一授权信息用于调度所述第二UE向第一UE发送D2D数据包；
接收所述第一UE发送的用于表示所述D2D数据包校验结果的反馈信息，所述反馈信息为确认ACK或非确认NACK；
如果接收的所述反馈信息是NACK，向所述第二UE发送第二授权信息，所述第二授权信息用于调度所述第二UE重传输所述D2D数据包。
可选地，接收所述第一UE发送的用于表示所述D2D数据包校验结果的反馈信息，包括：所述网络侧设备确定与发送D2D数据包的子帧之间具有第一预设间隔的子帧为第一UE发送反馈信息的反馈子帧，所述第一预设间隔为固定时域间隔或者为最小时域间隔，所述网络侧设备在所述反馈子帧接收所述第一UE发送的反馈信息。
可选地，所述网络侧设备确定与发送D2D数据包的子帧之间具有第一预设间隔的子帧为第一UE发送反馈信息的反馈子帧，包括：所述网络侧设备 确定与所述第一UE发送D2D数据包的子帧间隔一固定时间间隔的子帧为接收反馈信息的反馈子帧；或者，所述网络侧设备确定与所述第一UE发送D2D数据包的子帧的间隔满足最小时域间隔的第三可用反馈子帧为接收反馈信息的反馈子帧，所述第三可用反馈子帧是指满足以下条件至少之一的子帧：配置有反馈信息传输资源，非所述第一UE的D2D数据接收或发送子帧，非所述第二UE的D2D数据接收或发送子帧，非随机接入子帧。
可选地，如果所述反馈信息是NACK，所述方法还包括：所述网络侧设备向所述第一UE发送第二控制信令，所述第二控制信令用于调度所述第一UE接收D2D数据包的重传；所述第二控制信令中包括以下参数的部分或者全部，用于指示D2D数据包的重传：HARQ进程号，新数据指示NDI，冗余版本RV，数据重传的时域和/或频域资源分配参数。
一种设备到设备D2D通信调度装置，包括第一调度模块、反馈信息接收模块和第二调度模块，其中：
所述第一调度模块，设置为：向第二用户设备UE发送第一授权信息，所述第一授权信息用于调度所述第二UE向第一UE发送D2D数据包；
所述反馈信息接收模块，设置为：接收所述第一UE发送的用于表示所述D2D数据包校验结果的反馈信息，所述反馈信息为确认ACK或非确认NACK；
所述第二调度模块，设置为：当所述反馈信息接收模块接收的所述反馈信息是NACK时，向所述第二UE发送第二授权信息，所述第二授权信息用于调度所述第二UE重传输所述D2D数据包。
本发明实施例尽可能沿用已有D2D通信的实现，可以在不显著增加终端实现复杂度及信令开销的前提下，基于已有D2D传输模式引入基于HARQ ACK/NACK反馈及基于反馈进行重传的D2D单播通信，通过基于HARQ的单播通信提高D2D的频谱效率，扩大D2D通信的应用范围。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
图1是相关技术中蜂窝网络部署示意图；
图2是相关技术中无线资源结构的示意图；
图3为本发明实施例一D2D数据包接收方法流程图；
图4为本发明实施例二D2D数据包发送方法流程图；
图5为本发明实施例三D2D通信调度方法流程图；
图6为本发明实施例四调度装置结构示意图；
图7为本发明实施例四接收装置结构示意图；
图8为本发明实施例四发送装置结构示意图。
本发明的实施方式
下文中将结合附图对本发明的实施方式进行详细说明。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任意组合。
在附图的流程图示出的步骤可以在诸如一组计算机可执行指令的计算机系统中执行。并且，虽然在流程图中示出了逻辑顺序，但是在一些情况下，可以以不同于此处的顺序执行所示出或描述的步骤。
本文所述的技术适用于蜂窝无线通信系统或网络。常见的蜂窝无线通信系统可以基于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)蜂窝通信系统下行链路(或称为前向链路)基于OFDMA技术，上行链路(或称为反向链路)基于SC-FDMA多址技术。未来则有可能在一个链路上支持混合的多址技术。
在OFDMA/SC-FDMA系统中，用于通信的无线资源(Radio Resource)是时-频两维的形式。例如，对于LTE/LTE-A系统来说，上行和下行链路的通信资源在时间方向上都是以无线帧(radio frame)为单位划分，每个无线帧(radio frame)长度为10ms，包含10个长度为1ms的子帧(sub-frame)，每个子帧包括长度为0.5ms的两个时隙(slot)。而通常子帧在无线帧内的编号为0-9；无线帧的编号为0-1023。如图1所示。
在频率方向，资源以子载波(subcarrier)为单位划分，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)。子帧内时域相邻的两个PRB称为PRB对(PRB pair)。每个OFDM/SC-FDM符号上对应一个子载波的资源称为资源元素(Resource Element，RE)。
图2所示为蜂窝无线通信系统的网络部署示意图。图中所示可以是3GPP LTE/LTE-A系统，或者其它的蜂窝无线通信技术。在蜂窝无线通信系统的接入网中，网络设备一般包括一定数量的基站(base station，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，LPN)，例如毫微微小区或家庭基站(pico，Relay，femto，HeNB即Home eNB等)等，也可统称其为小小区(small cell)。为描述简单，图2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一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。
实施例一
本实施例提供一种设备到设备数据包接收方法，如图3所示，包括以下步骤：
步骤110，第一UE接收第二UE发送的D2D数据包；
第一UE可以根据网络侧设备或者第二UE发送的控制信令中的指示确定用于接收D2D数据包的资源，在所述资源中接收第二UE发送的D2D数据包。网络侧设备或者第二UE发送的控制信令中携带有用于指示接收D2D数据包的参数。用于指示接收D2D数据包的参数可以是位图(bitmap)，指示接收D2D数据包的子帧位置。
步骤120，所述第一UE对接收到的所述D2D数据包进行校验并发送用于表示校验结果的反馈信息，所述反馈信息为确认(acknowledgement，简称ACK)或非确认(negative acknowledgement，简称NACK)；如果所述反馈信息是NACK，则接收所述D2D数据包的重传。
第一UE可以向第二UE或者向网络侧设备发送反馈信息。发送ACK或NACK(以下简称ACK/NACK)反馈信息的子帧为反馈子帧。当第一UE向第二UE发送反馈信息时，所述反馈子帧为以下子帧之一：蜂窝通信系统的上行子帧或者下行子帧，配置有反馈资源(即反馈信息传输资源)的上行子帧或者下行子帧；第一控制信令所指示的子帧。当第一UE向所属基站发送反馈信息时，所述反馈子帧为以下子帧之一：蜂窝通信系统的上行子帧，配置有反馈资源(即反馈信息传输资源)的上行子帧；第一控制信令所指示的子帧。
基于Rel-12D2D SA(Scheduling Assignment，调度分配)周期，D2D数据包的HARQ反馈信息在数据传输所在的SA周期内传输。但是，Rel-12中每个数据包盲重传4次的规则需要被重新定义：是否重传取决于接收到的ACK/NACK反馈，如果校验结果为ACK则无需重传，如果校验结果为NACK则在反馈子帧发送反馈信息。反馈子帧可以根据预先设置的规则确定，也可以根据第一控制信令中的指示确定。下面分别进行说明。
方式一，第一UE根据预先设置的规则确定反馈子帧的位置
1a：预设的规则为反馈子帧与接收D2D数据包的子帧之间具有第一预设 间隔，该第一预设间隔是固定的时域间隔。
例如，用户设备在子帧n接收到所述D2D数据包，则确定与所述D2D数据包之间具有固定间隔k的子帧n+k用于传输ACK/NACK反馈信息，k取值为整数。比如，k取值为3或4或5等等。或者，k的取值与双工方式相关，比如频分双工FDD系统和时分双工TDD系统的取值可能不同；而对于TDD系统，k值可以是一个固定的值，或者k的取值包括多个，不同的TDD上下行配置(UL-DL Configuration)的k值可能不同。
这里所说的子帧n和子帧n+k可以是针对所有的子帧(比如所有的上行子帧或者所有的下行子帧)，或者是针对一个特定的子帧集合中的子帧。对于前者，间隔k为实际的间隔，比如k＝4，那么在子帧时长1ms的假设下，子帧n和子帧n+k之间的间隔是4毫秒(ms)。对于后者，实际的间隔可能会与k值不同。比如在上行子帧中分配一部分子帧(这一部分子帧形成一个子帧集合)用于D2D通信(这一部分子帧可以是分配的用于D2D数据传输和反馈信息传输的，或者只用于反馈信息传输)，子帧n+k的位置基于该子帧集合中的子帧及k值确定。比如，该子帧集合中包括编号为1、2、4、6、8、9的子帧，那么对于子帧2中的D2D数据包的传输，如果k＝4，则其反馈信息在子帧9传输，即计算间隔k时只考虑该子帧集合中的子帧。
在本方式中，D2D UE的ACK/NACK反馈具有最高优先级，即如果与其他传输碰撞时，放弃其他传输。例如，如果该反馈时发现有需要接收的包，则UE认为这是调度出错(error case)；如果反馈时有需要发送的包，如果是发送给同一个UE的，则可将ACK/NACK复用后传输，如果是发送给其他UE的，则其他UE的发送取消。其中：
(1)当第一UE在发送所述反馈信息的子帧同时有D2D接收需求时，比如确定的反馈子帧为n+k，但基站或者其他UE发送的控制信令指示该子帧n+k是第一UE的D2D接收子帧，则第一UE可以只发送ACK/NACK反馈信息而放弃进行D2D接收。
(2)当第一UE在发送所述反馈信息的子帧同时有D2D发送需求时，比如确定的反馈子帧为n+k，但基站或者其他UE发送的控制信令指示该子帧n+k是第一UE的D2D数据发送子帧，且所述发送的目标UE与所述反馈 信息发送的目标用户设备不同(本例中即为非第二UE)，则第一UE可以只发送ACK/NACK反馈信息而放弃向非反馈信息目标UE发送D2D数据。
(3)当第一UE在发送所述反馈信息的子帧同时有D2D发送需求时，比如确定的反馈子帧为n+k，但基站或者其他UE发送的控制信令指示该子帧n+k是第一UE的D2D数据发送子帧，且所述发送的目标UE与所述反馈信息发送的目标UE相同(本例中为第二UE)，则第一UE可以将所述ACK/NACK反馈信息与所述D2D数据复用后发送。例如，所述复用方式可以类似LTE系统中ACK/NACK信息在物理上行共享信道(Physical Uplink Shared Channel，PUSCH)中的复用方式。
1b：预设的规则为反馈子帧与接收D2D数据包的子帧之间具有第一预设间隔，该第一预设间隔为一最小时域间隔。
在本方式中，确定满足该最小时域间隔的第一可用反馈子帧，并在所述第一反馈子帧中传输ACK/NACK反馈信息。所述第一可用反馈子帧是指满足以下条件至少之一的子帧：配置有反馈信息传输资源或者被指示为反馈信息传输子帧的子帧；非所述第一UE的蜂窝通信数据接收或发送子帧；非所述第一UE的D2D数据接收或发送子帧；非所述第一UE的随机接入子帧。可选地，确定第一个可用反馈子帧为反馈信息传输的子帧位置，即UE在第一个不与D2D发送/接收冲突的子帧中传输反馈信息。
例如，该最小时域间隔为k(可取值为正整数，例如3或4或5等)。用户设备在子帧n接收到D2D数据后，在子帧n+k之后(此处不包括n+k子帧本身，其他实施例中也可以包括，取决于k的取值)的第一个可用反馈子帧中传输所述D2D数据的ACK/NACK反馈信息。例如可用的反馈子帧为子帧1、2、4、6、8、9，并且k＝3；第一UE在子帧1接收到D2D数据后，在子帧4之后的第一个可用反馈子帧传输ACK/NACK信息，由于子帧4之后的第一个可用反馈子帧为子帧6，即第一用户设备在子帧6传输反馈信息。
配置有反馈信息传输资源的子帧，是指该子帧中有网络侧设备配置或者预配置的用于D2D反馈信息传输的资源。而这些反馈信息传输资源可以在部分子帧中配置，比如网络侧配置或者预配置一部分子帧中有该反馈信息传输资源，或者全部子帧(全部的下行子帧，或者全部的上行子帧)中有该反馈 信息传输资源。
例如，第一UE接收到D2D数据后需要发送相应的反馈信息给D2D数据发送端(第二UE)。假设子帧1、3、6、7、8配置有反馈资源，并且仍然假设k＝3。那么如果第一UE在子帧1接收到D2D数据，需要在子帧4之后发送相应的ACK/NACK反馈信息。同时假设子帧6是第一UE的D2D接收子帧，即子帧6需要接收其他UE(第二UE或其他UE)发送的D2D数据，那么子帧6无法用于反馈信息传输，即子帧6不是第一UE的可用反馈子帧，需要确定子帧6之后的子帧用于ACK/NACK反馈信息的传输。
方式二，第一UE根据第一控制信令中的指示确定反馈子帧位置
eNB或发送端UE发送的第一控制信令中的指示包括用于指示反馈子帧位置的参数或者包括用于指示第一反馈间隔的参数，在本方式中，所述反馈子帧与接收所述D2D数据包的子帧之间具有第一反馈间隔，第一反馈间隔可以是固定时域间隔或者为最小时域间隔，第一UE根据第一控制信令中的指示确定反馈子帧的位置。
2a：发送所述ACK/NACK反馈信息的子帧为第一控制信令所指示的反馈子帧。例如，所述第一UE接收网络侧设备或所述第二UE发送的第一控制信令，所述第一控制信令中携带有用于指示传输所述反馈信息的子帧位置的参数；用户设备按照所述参数的指示发送所述反馈信息。
例如，通过位图(bitmap)指示传输所述反馈信息的子帧位置；所述位图可以与指示D2D数据传输子帧(即指示接收D2D数据包的子帧)的位图(比如LTE Release-12D2D中的的T-RPT，Time-Resource Pattern of Transmission，时间资源传输图样)是同一个参数，或者也可以是不同的参数。如果所述位图与指示D2D数据传输子帧的位图是同一个参数，可以约定所述位图中用于指示特定的比特位置的“1”表示反馈信息传输子帧的位置。比如，位图中的最后一个“1”表示反馈信息传输子帧位置；或者，位图中奇数(或者偶数)位置的“1”表示反馈信息传输子帧位置，其中奇数位置指位图中第m个“1”对应的子帧位置，m为奇数，或者位图中第m个比特对应的子帧位置，m为奇数；或者，位图中后半部分出现的“1”表示反馈信息传输子帧位置(比如位图长度为8比特，后半部分指后4比特)；等。
2b：发送所述ACK/NACK反馈信息的子帧根据第一控制信令的指示确定，第一控制信令中包括用于指示第一反馈间隔的参数。例如，所述第一用户设备接收网络侧设备或所述第二用户设备发送的第一控制信令，所述第一控制信令中携带有用于指示第一反馈间隔的参数，该第一反馈间隔表示传输所述反馈信息的子帧与所述数据传输子帧(即第一UE接收D2D数据包的子帧)之间的间隔；第一UE按照该间隔确定传输反馈信息的子帧位置并在该子帧中发送所述反馈信息。
所指示的第一反馈间隔可以与方式一中的第一预设间隔进行类似的定义，即此处的第一反馈间隔既可以是固定的时域间隔，也可以是一个最小时域间隔，但此处所述的第一反馈间隔与前述的第一预设间隔的区别是，所述第一反馈间隔是通过第一控制信令指示的一个间隔值，而第一预设间隔是预定义或者预配置的一个间隔值；基于所指示的第一反馈间隔确定间隔值之后，确定反馈子帧的方式可以与前述的基于第一预设间隔确定反馈子帧的方式相同。
指示所述第一反馈间隔的第一控制信令如果由网络侧设备发送，则所述第一控制信令可以是物理层信令，比如承载于DCI(Downlink Control Information，下行控制信息)中；也可以是高层信令，如承载于专用RRC(Radio Resource Control，无线资源控制)信令中，或者比如承载于广播信令(SIB)中。
第一UE接收D2D数据包并发送反馈信息后，如果反馈信息是NACK，则等待接收所述数据包的重传。有以下三种确定重传位置的方式。
方式1：第一UE发送反馈信息后，根据网络侧设备或者第二UE的调度进行重传接收；
在本方式中，第一UE检测用于调度所述数据包重传的第二控制信令。所述第二控制信令可以是基站发送的，比如基站发送下行控制信息(Downlink Control Information，DCI)调度D2D链路的数据传输和重传；或者是发送端UE(即第二用户设备发送的)，比如侧行控制信息(Sidelink Control Information(简称SCI)，也可称为调度分配(Scheduling Assignment， 简称SA))。检测到所述第二控制信令后，所述第一UE按照所述第二控制信令的指示进行所述D2D重传数据的接收。
所述第二控制信令中可以包括以下参数的部分或者全部：D2D链路的HARQ进程号(HARQ process number)，新数据指示(New Data Indicator，NDI)，冗余版本(Redundancy Version，RV)，数据重传的时域和/或频域资源分配参数，正交掩码(Orthogonal Cover Code，OCC)，所述D2D数据包的发送端(例如第二UE)的标识(Identifier，ID)，所述D2D数据包的接收端(例如第一UE)的ID。上述参数并不是必须携带的，可以通过约定或者其他隐含方式确定。
1a：D2D数据包发送端UE发送第二控制信令，可在用于D2D SA重传的资源发送用于调度所述D2D数据包重传的第二控制信令(SA)。例如，D2D通信中SA在每个SA周期内会传输2次，那么第一次传输的SA用于调度所述D2D数据包的首传，第二次传输的SA(即重传的SA)用于调度所述D2D数据包的重传。
在上述实现方式的基础上，还可以有以下方式：
(1)增加周期内SA的传输次数以用于调度所述D2D数据包的重传。例如，假设D2D数据包允许的周期内最大传输次数为p(即周期内最多可以重传p-1次)，那么可以约定周期内每个SA可以传输p次(或者最多传输p次)，其中第一次传输可以用于调度所述D2D数据包的首传，其余的传输用于调度所述D2D数据包的重传。如果首传时D2D数据包接收正确(即反馈信息是ACK)，则该周期内可以继续进行其他D2D数据包的传输；或者，约定每个周期内只会传输一个D2D数据包，如果首传时D2D数据包接收正确，需要等到下一个周期才能进行其他D2D数据包的传输。当支持多个并行的HARQ进程时，对于一个HARQ进程，如果首传时D2D数据包接收正确(即反馈信息是ACK)，则该HARQ进程在周期内所对应的其他传输子帧可以继续进行其他D2D数据包的传输；或者，约定每个周期内每个HARQ进程只会传输一个D2D数据包，如果首传时D2D数据包接收正确，需要等到下一个周期才能在该HARQ进程所对应的子帧进行其他D2D数据包的传输。
需要说明的是，p值可以固定，比如无论SA周期是多少，p值取值相 同；或者，p值根据SA周期的大小确定，比如SA周期为40ms时，p值取值为4，SA周期为80ms时，p值取值为8，等。
(2)在第二控制信令中携带新数据指示，用于指示首传还是重传，所述新数据指示的比特数可以根据可调度的HARQ进程数确定。比如最多可调度8个HARQ进程，则NDI指示信令的长度为8比特，每个比特对应一个HARQ进程。
新数据指示也可以和指示HARQ进程的bitmap结合使用，例如通过8比特的bitmap表示所对应的HARQ进程是否有数据被调度，并进而根据NDI确定所调度的HARQ进程是首传还是重传。
(3)所述首传或重传也可以通过RV隐含指示。例如，约定数据包传输的RV顺序为[0213]，则当指示的RV版本为0时表示所述D2D数据包的首传，RV版本为1时表示所述D2D数据包的第二次传输(即第一次重传)，依次类推。
1b：所述第二控制信令中包括数据重传的时域和/或频域资源分配参数，所述D2D数据包在所述资源分配参数指示的时域和/或频域资源中传输。
如果所述第二控制信令中不包括数据重传的时域和/或频域资源分配参数，所述D2D数据包传输的时域和/或频域资源与首传的位置相同。如果不包括时域资源分配参数，则D2D数据包重传时的时域资源与首传相同；如果不包括频域资源分配参数，则D2D数据包重传时的频域资源与首传相同；以此类推。所述的时域相同是指传输所述D2D数据包的子帧是同一个HARQ进程所对应的子帧(此处的HARQ进程指D2D HARQ进程，或者是蜂窝通信HARQ进程，比如蜂窝链路上行HARQ进程)；或者，是指传输所述D2D数据包的子帧在传输周期内的位置相同，例如首传是在传输周期内的第1个子帧中，那么重传时在下个传输周期内的第1个子帧中，传输周期可以保持与SA周期相同，或者是对SA周期进行划分得到。所述的频域相同是指传输所述D2D数据包的频域位置与初次传输或者上一次传输使用的频域位置相同，或者根据初次传输或者上一次传输的位置及跳频(frequency hopping)规则确定。
方式2：第一UE发送反馈信息后，如果反馈信息是NACK，则严格同步地进行重传接收，即第一UE在同一个HARQ进程中接收D2D数据包的重传，HARQ RTT(Round Trip Time，往返时间)是固定的；
所述HARQ传输采用同步的HARQ传输方式，同步是指同一个HARQ进程所对应的多次数据传输的子帧位置是固定的。
所述第一UE在同一个HARQ进程所对应的子帧中接收所述D2D数据的重传。如果控制信令中包括用于指示HARQ进程号的参数，则所述重传与首传具有相同HARQ进程号。
所述同一个HARQ进程所对应的子帧为蜂窝通信上行传输的HARQ进程所对应的子帧。例如对于FDD系统，上行链路总共有8个HARQ进程，即间隔8个子帧的子帧属于同一个HARQ进程，比如子帧n、子帧n+8、子帧n+16、…属于同一个HARQ进程。从而当UE在子帧n接收到的D2D数据包的校验结果是NACK时，在子帧n+8对该数据包进行重传，发送端和接收端UE分别在子帧n+8发送和接收所述D2D数据包的重传。
或者，所述同一个HARQ进程所对应的子帧为D2D通信的HARQ进程所对应的子帧。例如，D2D链路的HARQ进程数为N，D2D子帧的编号为0、1、2、…(D2D子帧可以是某个起始和结束范围内的所有子帧，例如所有下行子帧或者所有上行子帧，也可以是在蜂窝通信资源中分配的部分子帧，例如在蜂窝上行子帧中分配一部分作为D2D子帧)，则对D2D子帧的编号模N，结果相同的子帧都属于同一个D2D HARQ进程。例如D2D链路HARQ进程数N＝6，那么举个例子，编号为1、7、13、…的D2D子帧属于同一个HARQ进程。从而，当D2D子帧1中传输的D2D数据包的校验结果为NACK时，所述D2D数据包的发送端在D2D子帧7中进行所述D2D数据包的重发，所述接收端在子帧7中进行所述D2D数据包的接收。
所述D2D数据传输的子帧使用位图进行指示，所述位图中每个比特对应一个HARQ进程。比如，位图长度为M，位图中的每个比特对应1个子帧集合。假设D2D子帧的编号为0、1、2、…(D2D子帧的含义与上述例子中的可以相同)，则对D2D子帧的编号模M，取模的结果对应所述位图中的相应比特。假设M＝12，且调度D2D数据发送的位图为001000000000，则编号 为2、14、…的子帧对应的HARQ进程用于所述D2D数据包的传输，如果子帧2中传输的D2D数据包的校验结果为NACK，则其重传在子帧14中，依次类推，不再赘述。
方式3：第一UE发送反馈信息后，根据反馈子帧的位置以及第二预设间隔确定D2D数据的重传位置，同步地进行重传接收，所述第二预设间隔为所述反馈子帧与D2D数据包的重传子帧的间隔，所述第二预设间隔为固定时域间隔，所述第一UE在所述D2D数据的重传位置接收D2D数据包的重传(即在下一个满足第二预设间隔的子帧(或可用子帧)中接收重传)；
当校验结果为NACK时，所述D2D数据的重传位置根据反馈信息传输的子帧位置确定，比如与所述反馈子帧具有第二预定间隔的D2D子帧中发送所述设备到设备通信数据的重传。所述第二预定间隔可以是固定的间隔数值；所述D2D子帧可以是所有子帧(比如特定的起始和结束范围内的所有上行子帧)，或者是被配置的用于D2D数据传输的子帧。如果所述D2D子帧是所有子帧，则所述D2D数据包在与反馈信息传输子帧具有固定间隔的子帧中传输。如果所述D2D子帧是被配置的用于D2D数据传输的子帧，则所述D2D数据包在所述反馈信息传输子帧的固定间隔后的第一个(可用的)D2D数据传输子帧中传输；此时固定间隔只计算D2D数据传输的子帧，或者计算全部子帧，例如全部上行子帧。固定间隔只计算D2D数据传输的子帧是指，所述D2D数据包在所述反馈信息传输子帧的固定间隔个D2D数据传输子帧后的第一个(可用的)D2D数据传输子帧中传输；固定间隔计算全部上行子帧是指，所述D2D数据包在所述反馈信息传输子帧的固定间隔个子帧(所有上行子帧，其中也包括配置的D2D数据传输子帧)后的第一个(可用的)D2D数据传输子帧中传输。
在另一个实施例中，第一UE可以在位图指示的子帧接收D2D数据包以及所述D2D数据包的重传，位图的指示方式参照上文中描述，所述位图中每个比特对应一个HARQ进程。
实施例二
本实施例提供一种D2D数据包发送方法，如图4所示，包括以下步骤：
步骤210，第二UE向第一UE传输D2D数据包；
第二UE可以根据基站的调度向第一UE传输D2D数据包。
步骤220，当第二UE接收到所述第一UE发送的用于表示校验结果的反馈信息且反馈信息为NACK，或者接收到网络侧设备发送的用于指示D2D数据包重传的授权信息，向所述第一UE重传输所述D2D数据包。
本实施例为对应实施例一接收方法的发送方法，两方法具有相关对应性，本实施例方法中的实现方式可参照实施例一中的说明和举例。
第一UE发送反馈信息的子帧为反馈子帧。确定反馈子帧位置的方式有以下两种：
方式一：第二UE根据预先设置的规则确定所述反馈子帧的位置，在所述反馈子帧接收所述反馈信息。
所述预先设置的规则为所述反馈子帧与发送所述D2D数据包的子帧之间具有第一预设间隔，所述第一预设间隔为固定时域间隔或者为最小时域间隔，所述第二UE根据发送所述D2D数据包的子帧位置以及所述第一预设间隔确定反馈子帧位置。在同一次D2D数据传输过程中，为UE2预设的第一预设间隔与为UE1预设的第一预设间隔相同。可参见实施例一中第一预设间隔相关描述及举例。
当第一预设间隔为最小时域间隔时，所述第二UE确定满足所述最小时域间隔的第二可用反馈子帧为接收反馈信息的反馈子帧，所述第二可用反馈子帧是指满足以下条件至少之一的子帧：配置有反馈信息传输资源，非所述第二UE的D2D数据接收或发送子帧，非所述第二UE的随机接入子帧。
方式二：第二UE或者根据第一控制信令中的指示确定所述反馈子帧的位置，在所述反馈子帧接收所述反馈信息。
所述第一控制信令中的指示包括用于指示所述反馈子帧位置的参数，或者包括用于指示第一反馈间隔的参数，所述反馈子帧与发送所述D2D数据包的子帧之间具有第一反馈间隔，所述第一反馈间隔为固定时域间隔或者为最小时域间隔，所述第二UE根据第一控制信令中的指示确定所述反馈子帧的位置。可参见实施例一中第一反馈间隔相关描述及举例。
此时，当第一反馈间隔为最小时域间隔时，所述第二UE确定满足所述最小时域间隔的第二可用反馈子帧为接收反馈信息的反馈子帧。
第二UE采用以下方式之一向第一UE重传输所述D2D数据包：
方式一，所述第二UE根据网络侧设备发送的第二控制信令确定用于D2D数据包重传的资源，在所述用于D2D数据包重传的资源中重传输所述D2D数据包；
例如，基站发送DCI调度D2D数据重传，DCI中可以携带以下参数的部分或者全部用于指示D2D数据包的重传资源位置：HARQ进程号，新数据指示NDI，冗余版本RV，数据重传的时域和/或频域资源分配参数。可参见实施例一中描述。
方式二，所述第二UE确定用于D2D数据包重传的资源，向所述第一UE发送用于调度所述D2D数据包重传的第二控制信令，在所述用于D2D数据包重传的资源中重传输所述D2D数据包。
第二UE可根据网络侧的调度确定用于D2D数据包重传的资源，并在用于D2D调度分配SA重传的资源向第一UE发送用于调度所述D2D数据包重传的第二控制信令，同时第二UE在所述第二控制信令指示的重传资源上重传输所述D2D数据包。
方式三，所述第二UE在同一个HARQ进程中重传输所述D2D数据包，所述同一个HARQ进程所对应的子帧为蜂窝通信上行传输的HARQ进程所对应的子帧或者为D2D通信的HARQ进程所对应的子帧；
方式四，所述第二UE根据反馈子帧的位置以及第二预设间隔确定D2D数据的重传位置，所述第二预设间隔为所述反馈子帧与D2D数据包的重传子帧之间的间隔，所述第二预设间隔为固定时域间隔，所述第二UE在所述D2D数据的重传位置重传输所述D2D数据包。
在同一次D2D数据传输过程中，为UE2预设的第二预设间隔与为UE1预设的第二预设间隔相同。可参见实施例一中第二预设间隔相关描述及举例。
在一个实施例中，所述第二UE在位图指示的子帧发送D2D数据包以及 重传输所述D2D数据包，所述位图中每个比特对应一个HARQ进程。
在一个实施例中，第二UE在重传输D2D数据包时，可以使用非自适应重传的方式。当采用非自适应重传时，RV可以采用固定的RV顺序；频域资源位置可以与首传相同，或者根据首传的频域资源位置及跳频(frequency hopping)规则确定。
实施例三
本实施例提供一种D2D通信调度方法，如图5所示，包括：
步骤310，网络侧设备向第二UE发送第一授权信息，所述第一授权信息用于调度所述第二UE向第一UE发送D2D数据包；
步骤320，接收所述第一UE发送的用于表示所述D2D数据包校验结果的反馈信息，所述反馈信息为ACK或NACK；
步骤330，如果接收到的所述反馈信息是NACK，向所述第二UE发送第二授权信息，所述第二授权信息用于调度所述第二UE重传输所述D2D数据包。
上述步骤320中，所述网络侧设备确定与发送D2D数据包的子帧之间具有第一预设间隔的子帧为第一UE发送反馈信息的反馈子帧，所述第一预设间隔为固定时域间隔或者为最小时域间隔，所述网络侧设备在所述反馈子帧接收所述第一UE发送的反馈信息。所述反馈子帧为蜂窝通信系统的上行子帧或者下行子帧，或者配置有反馈资源的上行子帧或者下行子帧，或者，发送所述ACK/NACK反馈信息的子帧为所述授权信息所指示的反馈子帧。
第一预设间隔为固定时域间隔时，网络侧设备确定与所述第一UE发送D2D数据包的子帧间隔一固定时间间隔的子帧为接收反馈信息的反馈子帧；其中，所述反馈信息在所述反馈子帧的反馈资源中传输；或者，所述反馈信息复用在所述第一UE发送给所述网络侧设备的蜂窝通信数据或蜂窝链路上行反馈信息中进行传输。第一预设间隔为最小时域间隔时，网络侧设备确定与所述第一UE发送D2D数据包的子帧的间隔满足最小时域间隔的第三可用反馈子帧为接收反馈信息的反馈子帧，所述第三可用反馈子帧是指满足以下 条件至少之一的子帧：配置有反馈信息传输资源，非所述第一UE的D2D数据接收或发送子帧，非所述第二UE的D2D数据接收或发送子帧，非随机接入子帧。
关于第一预设间隔的实现方式参见实施例一中第一预设间隔的相关描述。
如果所述反馈信息是NACK，上述方法还包括以下步骤：所述网络侧设备向所述第一UE发送第二控制信令，所述第二控制信令用于调度所述第一UE接收D2D数据包的重传；所述第二控制信令中包括以下参数的部分或者全部，用于指示D2D数据包的重传：HARQ进程号，新数据指示NDI，冗余版本RV，数据重传的时域和/或频域资源分配参数。
所述反馈信息的传输与D2D数据包的重传参考前述实施例。
实施例四
本实施例提供一种用于设备到设备通信的系统，包括：蜂窝网络的网络侧设备、第一用户设备和第二用户设备。下面分别对上述实体进行说明。
一个实施例中，蜂窝网络的网络侧设备可以是如前述实例描述的基站。该网络侧设备包括如图6所示的调度装置，所述装置至少可以包括：第一调度模块410、反馈信息接收模块420和第二调度模块430，其中：
所述第一调度模块410，设置为：向第二UE发送第一授权信息，所述第一授权信息用于调度所述第二UE向第一UE发送D2D数据包；
所述反馈信息接收模块420，设置为：接收所述第一UE发送的用于表示所述D2D数据包校验结果的反馈信息，所述反馈信息为确认ACK或非确认NACK；
所述第二调度模块430，设置为：当所述反馈信息接收模块420接收的所述反馈信息是NACK时，向所述第二UE发送第二授权信息，所述第二授权信息用于调度所述第二UE重传输所述D2D数据包。
所述第一UE发送反馈信息的子帧为反馈子帧，所述反馈子帧为蜂窝通信系统的上行子帧或者下行子帧，或者配置有反馈资源的上行子帧或者下行 子帧，或者，发送所述ACK/NACK反馈信息的子帧为所述授权信息所指示的反馈子帧。
在一个实施例中，所述反馈信息接收模块420确定与发送D2D数据包的子帧之间具有第一预设间隔的子帧为第一UE发送反馈信息的反馈子帧，所述第一预设间隔为固定时域间隔或者为最小时域间隔，所述反馈信息接收模块420在所述反馈子帧接收所述第一UE发送的反馈信息。
第一预设间隔为固定时域间隔时，所述反馈信息接收模块420确定与所述第一UE发送D2D数据包的子帧间隔一固定时间间隔的子帧为接收反馈信息的反馈子帧；或者，
第一预设间隔为最小时域间隔时，所述反馈信息接收模块420确定与所述第一UE发送D2D数据包的子帧的间隔满足最小时域间隔的第三可用反馈子帧为接收反馈信息的反馈子帧，所述第三可用反馈子帧是指满足以下条件至少之一的子帧：配置有反馈信息传输资源，非所述第一UE的D2D数据接收或发送子帧，非所述第二UE的D2D数据接收或发送子帧，非随机接入子帧。
在一个实施例中，当所述反馈信息是NACK时，所述第二调度模块430还设置为：向所述第一UE发送第二控制信令，所述第二控制信令用于调度所述第一UE接收D2D数据包的重传；所述第二控制信令中包括以下参数的部分或者全部，用于指示D2D数据包的重传：HARQ进程号，新数据指示NDI，冗余版本RV，数据重传的时域和/或频域资源分配参数。
在一个实施方式中，网络侧设备可以是基站(base station或eNB)，或者其他的网络接入设备如小小区，也可以是更上层的网络节点，如网关(gateway)，或者移动性管理实体(Mobility Management Entity，MME)，或者为D2D提供服务的其他服务器或网络单元，或者同时包括上述节点的一个或者多个。
在另一个实施方式中，网络侧设备也可以是无覆盖场景中临时部署的网络单元。无覆盖场景是指用户设备处于蜂窝网络覆盖盲区的场景，例如蜂窝基础设施损坏，或者覆盖空洞区域，等。
在另一个实施方式中，网络侧设备也可以是担当簇头(Cluster Head)或者主UE(Primary UE)的UE，例如在一些特定场景比如无网络覆盖的场景中，由特定的用户设备进行设备发现资源的配置。
在一个实施例中，第一UE包括如图7所示的接收装置，所述接收装置至少可以包括：第一D2D数据包接收模块510、校验模块520、第一发送模块530和第二D2D数据包接收模块540，其中：
所述第一D2D数据包接收模块510，设置为：接收第二UE发送的D2D数据包；
所述校验模块520，设置为：对所述D2D数据包进行校验；
所述第一发送模块530，设置为：发送用于表示校验结果的反馈信息，所述反馈信息为确认ACK或非确认NACK；
所述第二D2D数据包接收模块540，设置为：在所述反馈信息是NACK时，接收所述D2D数据包的重传。
在一个实施例中，发送反馈信息的子帧为反馈子帧，所述第一发送模块530还设置为：根据预先设置的规则确定所述反馈子帧的位置确定所述反馈子帧的位置。所述预先设置的规则为所述反馈子帧与接收所述D2D数据包的子帧之间具有第一预设间隔，所述第一预设间隔为固定时域间隔或者为最小时域间隔，所述第一发送模块530根据接收所述D2D数据包的子帧位置以及所述第一预设间隔确定所述反馈子帧的位置。
可选地，所述装置还包括判断模块550，设置为：在所述第一发送模块530根据接收所述D2D数据包的子帧位置以及所述第一预设间隔确定反馈子帧位置后，判断如果在确定的反馈子帧有D2D数据接收需求，则通知所述第一D2D数据包接收模块510和所述第二D2D数据包接收模块540放弃D2D数据接收；判断如果在确定的反馈子帧有D2D数据发送需求且所述D2D数据发送的目标UE非所述第二UE时，通知所述第一发送模块530放弃D2D数据发送；判断如果在确定的反馈子帧有D2D数据发送需求且所述D2D数据发送的目标UE为所述第二UE时，通知所述第一发送模块530将所述反馈 信息与所述D2D数据复用后在反馈子帧发送。
可选地，第一预设间隔为最小时域间隔时，所述第一收发模块530确定满足所述最小时域间隔的第一可用反馈子帧为发送反馈信息的反馈子帧，所述第一可用反馈子帧是指满足以下条件至少之一的子帧：配置有反馈信息传输资源或者被指示为反馈信息传输子帧的子帧，非所述第一UE的蜂窝通信数据接收或发送子帧，非所述第一UE的D2D数据接收或发送子帧，非所述第一UE的随机接入子帧。
在另一个实施例中，所述第一发送模块530还设置为：根据第一控制信令中的指示确定所述反馈子帧的位置。所述第一控制信令中的指示包括用于指示反馈子帧位置的参数，或者包括用于指示第一反馈间隔的参数，所述第一反馈间隔为反馈子帧与接收D2D数据包的子帧的间隔，所述第一反馈间隔为固定时域间隔或者为最小时域间隔，所述第一发送模块530根据所述第一控制信令中的指示确定所述反馈子帧的位置。
可选地，所述第一反馈间隔为最小时域间隔时，所述第一收发模块530确定满足所述最小时域间隔的第一可用反馈子帧为发送反馈信息的反馈子帧。
在另一个实施例中，所述第二D2D数据包接收模块540采用以下方式之一接收所述D2D数据包的重传：
方式一，所述第二D2D数据包接收模块540根据网络侧设备或者第二UE的调度接收所述D2D数据包的重传；
所述第二D2D数据包接收模块540接收网络侧设备发送的第二控制信令或者第二UE在用于D2D SA重传的资源发送的第二控制信令，所述第二控制信令用于调度所述D2D数据包的重传，所述第二D2D数据包接收模块按照所述第二控制信令的指示接收所述D2D数据包的重传。所述第二控制信令中包括以下参数的部分或者全部，用于指示D2D数据包的重传：HARQ进程号，新数据指示NDI，冗余版本RV，数据重传的时域和/或频域资源分配参数。
方式二，所述第二D2D数据包接收模块540在同一个混合自动重传 HARQ进程中接收D2D数据包的重传；
所述第二D2D数据包接收模块540在同一个HARQ进程所对应的子帧中接收所述D2D数据的重传，所述同一个HARQ进程所对应的子帧为蜂窝通信上行传输的HARQ进程所对应的子帧或者为D2D通信的HARQ进程所对应的子帧。
方式三，所述第二D2D数据包接收模块540根据所述反馈子帧的位置以及第二预设间隔确定D2D数据的重传位置，所述第二预设间隔为所述反馈子帧与D2D数据包的重传子帧的间隔，所述第二预设间隔为固定时域间隔，所述第二D2D数据包接收模块540在所述D2D数据的重传位置接收D2D数据包的重传。
在一个实施例中，所述第一D2D数据包接收模块510接收第二UE发送的D2D数据包，包括：所述第一D2D数据包接收模块510在位图指示的子帧接收D2D数据包；所述第二D2D数据包接收模块540接收所述D2D数据包的重传，包括：所述第二D2D数据包接收模块540在所述位图指示的子帧接收所述D2D数据包的重传；所述位图中每个比特对应一个HARQ进程。
在一个实施例中，第二UE如图8所示的发送装置，所述发送装置至少可以包括：传输模块610和重传输模块620，其中：
所述传输模块610，设置为：向第一UE传输D2D数据包；
所述重传输模块620，设置为：当接收到所述第一UE发送的用于表示校验结果的反馈信息且反馈信息为非确认NACK，或者接收到网络侧设备发送的用于指示D2D数据包重传的授权信息，向所述第一UE重传输所述D2D数据包。
所述第一UE发送反馈信息的子帧为反馈子帧。
在一个实施例中，所述重传输模块620根据预先设置的规则确定所述反馈子帧的位置，在所述反馈子帧接收所述反馈信息。
所述预先设置的规则为所述反馈子帧与发送所述D2D数据包的子帧之间具有第一预设间隔，所述第一预设间隔为固定时域间隔或者为最小时域间 隔，所述重传输模块620根据发送所述D2D数据包的子帧位置以及所述第一预设间隔确定反馈子帧位置。
所述第一预设间隔为最小时域间隔时，所述重传输模块620确定满足所述最小时域间隔的第二可用反馈子帧为接收反馈信息的反馈子帧，所述第二可用反馈子帧是指满足以下条件至少之一的子帧：配置有反馈信息传输资源，非所述第二UE的D2D数据接收或发送子帧，非所述第二UE的随机接入子帧。
在另一个实施例中，所述重传输模块620根据第一控制信令中的指示确定所述反馈子帧的位置，在所述反馈子帧接收所述反馈信息。
所述第一控制信令中的指示包括用于指示所述反馈子帧位置的参数，或者包括用于指示第一反馈间隔的参数，所述反馈子帧与发送所述D2D数据包的子帧之间具有第一反馈间隔，所述第一反馈间隔为固定时域间隔或者为最小时域间隔，所述重传输模块620根据第一控制信令中的指示确定所述反馈子帧的位置。
所述第一反馈间隔为最小时域间隔时，所述重传输模块620确定满足所述最小时域间隔的第二可用反馈子帧为接收反馈信息的反馈子帧。
在一个实施例中，所述重传输模块620采用以下方式向所述第一UE重传输所述D2D数据包：
方式一，所述重传输模块620根据网络侧设备发送的第二控制信令确定用于D2D数据包重传的资源，在所述用于D2D数据包重传的资源中重传输所述D2D数据包；
方式二，所述重传输模块620确定用于D2D数据包重传的资源，向所述第一UE发送用于调度所述D2D数据包重传的第二控制信令，在所述用于D2D数据包重传的资源中重传输所述D2D数据包。
所述重传输模块620在用于D2D调度分配SA重传的资源向所述第一UE发送用于调度所述D2D数据包重传的第二控制信令，所述重传输模块620在所述第二控制信令指示的重传资源上重传输所述D2D数据包。所述第二控制信令中包括以下参数的部分或者全部，用于指示D2D数据包的重传： HARQ进程号，新数据指示NDI，冗余版本RV，数据重传的时域和/或频域资源分配参数。
方式三，所述重传输模块620在同一个混合自动重传HARQ进程中重传输所述D2D数据包，所述同一个HARQ进程所对应的子帧为蜂窝通信上行传输的HARQ进程所对应的子帧或者为D2D通信的HARQ进程所对应的子帧；
方式四，所述重传输模块620根据反馈子帧的位置以及第二预设间隔确定D2D数据的重传位置，所述第二预设间隔为所述反馈子帧与D2D数据包的重传子帧之间的间隔，所述第二预设间隔为固定时域间隔，所述重传输模块在所述D2D数据的重传位置重传输所述D2D数据包。
在一个实施例中，所述传输模块610向第一UE传输D2D数据包，包括：所述传输模块610在位图指示的子帧发送D2D数据包；所述重传输模块620向所述第一UE重传输所述D2D数据包，包括所述重传输模块620在所述位图指示的子帧重传输所述D2D数据包；所述位图中每个比特对应一个HARQ进程。
本领域普通技术人员可以理解上述实施例的全部或部分步骤可以使用计算机程序流程来实现，所述计算机程序可以存储于一计算机可读存储介质中，所述计算机程序在相应的硬件平台上(如系统、设备、装置、器件等)执行，在执行时，包括方法实施例的步骤之一或其组合。
可选地，上述实施例的全部或部分步骤也可以使用集成电路来实现，这些步骤可以被分别制作成一个个集成电路模块，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。
上述实施例中的装置/功能模块/功能单元可以采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，也可以分布在多个计算装置所组成的网络上。
上述实施例中的装置/功能模块/功能单元以软件功能模块的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。 上述提到的计算机可读取存储介质可以是只读存储器，磁盘或光盘等。
工业实用性
本发明实施例尽可能沿用已有D2D通信的实现，可以在不显著增加终端实现复杂度及信令开销的前提下，基于已有D2D传输模式引入基于HARQ ACK/NACK反馈及基于反馈进行重传的D2D单播通信，通过基于HARQ的单播通信提高D2D的频谱效率，扩大D2D通信的应用范围。

Claims (29)

  1. 一种设备到设备D2D数据包接收方法，包括：
    第一用户设备UE接收第二UE发送的D2D数据包；
    第一UE对接收到的所述D2D数据包进行校验并发送用于表示校验结果的反馈信息，所述反馈信息为确认ACK或非确认NACK，如果所述反馈信息是NACK，则接收所述D2D数据包的重传。
  2. 根据权利要求1所述的方法，其中，
    发送反馈信息的子帧为反馈子帧，所述方法还包括：所述第一UE根据预先设置的规则确定所述反馈子帧的位置或者根据第一控制信令中的指示确定所述反馈子帧的位置。
  3. 根据权利要求2所述的方法，其中，
    所述第一UE根据预先设置的规则确定所述反馈子帧的位置，包括：
    所述预先设置的规则为所述反馈子帧与接收所述D2D数据包的子帧之间具有第一预设间隔，所述第一预设间隔为固定时域间隔或者为最小时域间隔，所述第一UE根据接收所述D2D数据包的子帧位置以及所述第一预设间隔确定所述反馈子帧的位置。
  4. 根据权利要求3所述的方法，其中，
    所述第一UE根据接收所述D2D数据包的子帧位置以及所述第一预设间隔确定反馈子帧位置时，所述方法还包括：
    当在确定的反馈子帧有D2D数据接收需求时，所述第一UE放弃D2D数据接收；当在确定的反馈子帧有D2D数据发送需求且所述D2D数据发送的目标UE非所述第二UE时，所述第一UE放弃D2D数据发送；当在确定的反馈子帧有D2D数据发送需求且所述D2D数据发送的目标UE为所述第二UE时，所述第一UE将所述反馈信息与所述D2D数据复用后在反馈子帧发送。
  5. 根据权利要求2所述的方法，其中，
    所述第一UE根据第一控制信令中的指示确定所述反馈子帧的位置，包 括：
    所述第一控制信令中的指示包括用于指示反馈子帧位置的参数，或者包括用于指示第一反馈间隔的参数，所述反馈子帧与接收所述D2D数据包的子帧之间具有第一反馈间隔，所述第一反馈间隔为固定时域间隔或者为最小时域间隔，所述第一UE根据所述第一控制信令中的指示确定所述反馈子帧的位置。
  6. 根据权利要求3或5所述的方法，其中，
    所述第一UE根据最小时域间隔确定所述反馈子帧的位置，包括：
    确定满足所述最小时域间隔的第一可用反馈子帧为发送反馈信息的反馈子帧，所述第一可用反馈子帧是指满足以下条件至少之一的子帧：配置有反馈信息传输资源或者被指示为反馈信息传输子帧的子帧，非所述第一UE的蜂窝通信数据接收或发送子帧，非所述第一UE的D2D数据接收或发送子帧，非所述第一UE的随机接入子帧。
  7. 根据权利要求1-5中任一权利要求所述的方法，其中，
    所述第一UE接收所述D2D数据包的重传，包括：
    所述第一UE根据网络侧设备或者第二UE的调度接收所述D2D数据包的重传；或者，
    所述第一UE在同一个混合自动重传HARQ进程中接收D2D数据包的重传；或者，
    所述第一UE根据所述反馈子帧的位置以及第二预设间隔确定D2D数据的重传位置，所述第二预设间隔为固定时域间隔，所述第一UE在所述D2D数据的重传位置接收D2D数据包的重传。
  8. 根据权利要求7所述的方法，其中，
    所述第一UE根据网络侧设备或者第二UE的调度接收所述D2D数据包的重传，包括：
    所述第一UE接收网络侧设备发送的第二控制信令或者第二UE在用于D2D调度分配SA重传的资源发送的第二控制信令，所述第二控制信令用于调度所述D2D数据包的重传，所述第一UE按照所述第二控制信令的指示接 收所述D2D数据包的重传。
  9. 根据权利要求8所述的方法，其中，
    所述第二控制信令中包括以下参数的部分或者全部，用于指示D2D数据包的重传：HARQ进程号，新数据指示NDI，冗余版本RV，数据重传的时域和/或频域资源分配参数。
  10. 根据权利要求7所述的方法，其中，
    所述第一UE在同一个混合自动重传HARQ进程中接收D2D数据包的重传，包括：
    所述第一UE在同一个HARQ进程所对应的子帧中接收所述D2D数据的重传，所述同一个HARQ进程所对应的子帧为蜂窝通信上行传输的HARQ进程所对应的子帧或者为D2D通信的HARQ进程所对应的子帧。
  11. 根据权利要求1所述的方法，其中，
    所述第一UE接收第二UE发送的D2D数据包，包括：所述第一UE在位图指示的子帧接收D2D数据包；
    所述第一UE接收所述D2D数据包的重传，包括：所述第一UE在所述位图指示的子帧接收所述D2D数据包的重传；
    所述位图中每个比特对应一个HARQ进程。
  12. 一种设备到设备D2D数据包发送方法，包括：
    第二UE向第一UE传输D2D数据包；
    当接收到所述第一UE发送的用于表示校验结果的反馈信息且反馈信息为非确认NACK，或者接收到网络侧设备发送的用于指示D2D数据包重传的授权信息，向所述第一UE重传输所述D2D数据包。
  13. 根据权利要求12所述的方法，其中，
    所述第一UE发送反馈信息的子帧为反馈子帧，所述方法还包括：所述第二UE根据预先设置的规则确定所述反馈子帧的位置或者根据第一控制信令中的指示确定所述反馈子帧的位置，在所述反馈子帧接收所述反馈信息。
  14. 根据权利要求13所述的方法，其中，
    所述第二UE根据预先设置的规则确定所述反馈子帧的位置，包括：
    所述预先设置的规则为所述反馈子帧与发送所述D2D数据包的子帧之间具有第一预设间隔，所述第一预设间隔为固定时域间隔或者为最小时域间隔，所述第二UE根据发送所述D2D数据包的子帧位置以及所述第一预设间隔确定反馈子帧位置。
  15. 根据权利要求13所述的方法，其中，
    所述第二UE根据第一控制信令中的指示确定所述反馈子帧的位置，包括：
    所述第一控制信令中的指示包括用于指示所述反馈子帧位置的参数，或者包括用于指示第一反馈间隔的参数，所述反馈子帧与发送所述D2D数据包的子帧之间具有第一反馈间隔，所述第一反馈间隔为固定时域间隔或者为最小时域间隔，所述第二UE根据第一控制信令中的指示确定所述反馈子帧的位置。
  16. 根据权利要求14或15所述的方法，其中，
    所述第二UE根据最小时域间隔确定所述反馈子帧的位置，包括：确定满足所述最小时域间隔的第二可用反馈子帧为接收反馈信息的反馈子帧，所述第二可用反馈子帧是指满足以下条件至少之一的子帧：配置有反馈信息传输资源，非所述第二UE的D2D数据接收或发送子帧，非所述第二UE的随机接入子帧。
  17. 根据权利要求12-15中任一权利要求所述的方法，其中，
    所述向所述第一UE重传输所述D2D数据包，包括：
    所述第二UE根据网络侧设备发送的第二控制信令确定用于D2D数据包重传的资源，在所述用于D2D数据包重传的资源中重传输所述D2D数据包；或者，
    所述第二UE确定用于D2D数据包重传的资源，向所述第一UE发送用于调度所述D2D数据包重传的第二控制信令，在所述用于D2D数据包重传的资源中重传输所述D2D数据包。
  18. 根据权利要求12-15任一权利要求所述的方法，其中，
    所述向所述第一UE重传输所述D2D数据包，包括：
    所述第二UE在同一个混合自动重传HARQ进程中重传输所述D2D数据包，所述同一个HARQ进程所对应的子帧为蜂窝通信上行传输的HARQ进程所对应的子帧或者为D2D通信的HARQ进程所对应的子帧；或者
    所述第二UE根据反馈子帧的位置以及第二预设间隔确定D2D数据的重传位置，所述第二预设间隔为固定时域间隔，所述第二UE在所述D2D数据的重传位置重传输所述D2D数据包。
  19. 根据权利要求17所述的方法，其中，
    所述第二UE确定用于D2D数据包重传的资源，向所述第一UE发送用于调度所述D2D数据包重传的第二控制信令，在所述用于D2D数据包重传的资源中重传输所述D2D数据包，包括：
    所述第二UE在用于D2D调度分配SA重传的资源向所述第一UE发送用于调度所述D2D数据包重传的第二控制信令，所述第二UE在所述第二控制信令指示的重传资源上重传输所述D2D数据包。
  20. 根据权利要求17所述的方法，其中，
    所述第二控制信令中包括以下参数的部分或者全部，用于指示D2D数据包的重传：HARQ进程号，新数据指示NDI，冗余版本RV，数据重传的时域和/或频域资源分配参数。
  21. 根据权利要求12所述的方法，其中，
    所述第二UE向第一UE传输D2D数据包，包括：所述第二UE在位图指示的子帧发送D2D数据包；
    所述第二UE向所述第一UE重传输所述D2D数据包，包括：所述第二UE在所述位图指示的子帧重传输所述D2D数据包；
    所述位图中每个比特对应一个HARQ进程。
  22. 一种设备到设备D2D通信调度方法，包括：
    网络侧设备向第二用户设备UE发送第一授权信息，所述第一授权信息用于调度所述第二UE向第一UE发送D2D数据包；
    接收所述第一UE发送的用于表示所述D2D数据包校验结果的反馈信息，所述反馈信息为确认ACK或非确认NACK；
    如果接收的所述反馈信息是NACK，向所述第二UE发送第二授权信息，所述第二授权信息用于调度所述第二UE重传输所述D2D数据包。
  23. 根据权利要求22所述的方法，其中，
    接收所述第一UE发送的用于表示所述D2D数据包校验结果的反馈信息，包括：
    所述网络侧设备确定与发送D2D数据包的子帧之间具有第一预设间隔的子帧为第一UE发送反馈信息的反馈子帧，所述第一预设间隔为固定时域间隔或者为最小时域间隔，所述网络侧设备在所述反馈子帧接收所述第一UE发送的反馈信息。
  24. 根据权利要求23所述的方法，其中，
    所述网络侧设备确定与发送D2D数据包的子帧之间具有第一预设间隔的子帧为第一UE发送反馈信息的反馈子帧，包括：
    所述网络侧设备确定与所述第一UE发送D2D数据包的子帧间隔一固定时间间隔的子帧为接收反馈信息的反馈子帧；或者，
    所述网络侧设备确定与所述第一UE发送D2D数据包的子帧的间隔满足最小时域间隔的第三可用反馈子帧为接收反馈信息的反馈子帧，所述第三可用反馈子帧是指满足以下条件至少之一的子帧：配置有反馈信息传输资源，非所述第一UE的D2D数据接收或发送子帧，非所述第二UE的D2D数据接收或发送子帧，非随机接入子帧。
  25. 根据权利要求22所述的方法，其中，
    如果所述反馈信息是NACK，所述方法还包括：所述网络侧设备向所述第一UE发送第二控制信令，所述第二控制信令用于调度所述第一UE接收D2D数据包的重传；
    所述第二控制信令中包括以下参数的部分或者全部，用于指示D2D数据包的重传：HARQ进程号，新数据指示NDI，冗余版本RV，数据重传的时域和/或频域资源分配参数。
  26. 一种设备到设备D2D数据包接收装置，包括第一D2D数据包接收模块、校验模块、第一发送模块和第二D2D数据包接收模块，其中：
    所述第一D2D数据包接收模块，设置为：接收第二UE发送的D2D数据包；
    所述校验模块，设置为：对所述D2D数据包进行校验；
    所述第一发送模块，设置为：发送用于表示校验结果的反馈信息，所述反馈信息为确认ACK或非确认NACK；
    所述第二D2D数据包接收模块，设置为：在所述反馈信息是NACK时，接收所述D2D数据包的重传。
  27. 一种设备到设备D2D数据包发送装置，包括传输模块和重传输模块，其中：
    所述传输模块，设置为：向第一UE传输D2D数据包；
    所述重传输模块，设置为：当接收到所述第一UE发送的用于表示校验结果的反馈信息且反馈信息为非确认NACK，或者接收到网络侧设备发送的用于指示D2D数据包重传的授权信息，向所述第一UE重传输所述D2D数据包。
  28. 一种设备到设备D2D通信调度装置，包括第一调度模块、反馈信息接收模块和第二调度模块，其中：
    所述第一调度模块，设置为：向第二用户设备UE发送第一授权信息，所述第一授权信息用于调度所述第二UE向第一UE发送D2D数据包；
    所述反馈信息接收模块，设置为：接收所述第一UE发送的用于表示所述D2D数据包校验结果的反馈信息，所述反馈信息为确认ACK或非确认NACK；
    所述第二调度模块，设置为：当所述反馈信息接收模块接收的所述反馈信息是NACK时，向所述第二UE发送第二授权信息，所述第二授权信息用于调度所述第二UE重传输所述D2D数据包。
  29. 一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令用于执行权利要求1-25任一项的方法。
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