WO2018133004A1 - 数据重传方法及装置 - Google Patents

数据重传方法及装置 Download PDF

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Publication number
WO2018133004A1
WO2018133004A1 PCT/CN2017/071698 CN2017071698W WO2018133004A1 WO 2018133004 A1 WO2018133004 A1 WO 2018133004A1 CN 2017071698 W CN2017071698 W CN 2017071698W WO 2018133004 A1 WO2018133004 A1 WO 2018133004A1
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Prior art keywords
pdu
sequence number
determining
received
serial number
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PCT/CN2017/071698
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English (en)
French (fr)
Inventor
常俊仁
冯淑兰
张亮亮
张向东
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华为技术有限公司
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Priority to PCT/CN2017/071698 priority Critical patent/WO2018133004A1/zh
Publication of WO2018133004A1 publication Critical patent/WO2018133004A1/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

Definitions

  • the embodiments of the present invention relate to the field of communications technologies, and in particular, to a data retransmission method and apparatus.
  • the transmitting end may perform data retransmission, that is, retransmit the data to the receiving end.
  • data retransmission by a transmitting end is mainly performed based on an automatic repeat request (ARQ) mechanism.
  • ARQ automatic repeat request
  • the transmitting end sends data to the receiving end in the form of a Protocol Data Unit (PDU).
  • PDU Protocol Data Unit
  • the process of performing data retransmission based on the ARQ mechanism may be: in the process of sending a PDU to the receiving end, each PDU has its corresponding serial number, and the serial number of each PDU is sent according to the first time. The order of the PDUs increases in turn.
  • the receiving end detects that the sequence number of the currently received PUD is not consecutive before the current time and the sequence number of the PDU received last time from the current time, the receiving end starts the reordering timer.
  • the sequence number is smaller than the above.
  • the PDU of the currently received PUD and the PDU that has not been received is called the target PDU.
  • the receiving end When the time of the reordering timer arrives, if the receiving end still does not receive the target PDU, the receiving end will send the above to the transmitting end.
  • the status report of the target PDU when the sending end receives the status report for the target PDU, retransmits the target PDU to the receiving end to ensure that the receiving end can receive the target PDU.
  • whether the transmitting end performs PDU retransmission depends on the status report sent by the receiving end, and the status report sent by the receiving end arrives at the time of the reordering timer and has not received the status.
  • the transmitting end needs to wait for at least one reordering timer to retransmit the PDU to the receiving end, which affects the data transmission in the wireless communication system. effectiveness.
  • the embodiment of the present invention provides a data retransmission method and device.
  • the technical solution is as follows:
  • a data retransmission method comprising:
  • HARQ Hybrid Automatic Repeat Request
  • ACK reception acknowledgement
  • RLC Radio Link Control
  • PDCP Packet Data Convergence Protocol
  • the data retransmission method is used by the sending end, and the sending end is used to send the PDU to the receiving end. Therefore, in the embodiment of the present invention, the first PDU to be retransmitted is determined, and is resent to the receiving end. The first PDU does not need to wait for the receiving end to send a status report for the first PDU, which shortens the time for the transmitting end to retransmit the first PDU, thereby improving The efficiency of data transmission in a wireless communication system.
  • the determining, according to the currently sent PDU, the at least one PDU that does not receive the HARQ ACK includes:
  • first sequence number is a maximum sequence number in a sequence number of the currently consecutively received PDU
  • second sequence number is a sequence number of a current next PDU to be transmitted
  • determining, according to the at least one PDU that does not receive the HARQ ACK, the first PDU to be retransmitted including:
  • At least one PDU whose sequence number is between the first sequence number and the second sequence number that does not receive the HARQ ACK is determined as the first PDU.
  • the first PDU is determined according to the first sequence number and the second sequence number, and the range of the PDU to be retransmitted can be increased.
  • the determining, according to the currently sent PDU, the at least one PDU that does not receive the HARQ ACK includes:
  • determining, according to the at least one PDU that does not receive the HARQ ACK, the first PDU to be retransmitted including:
  • the transmitting end may determine at least one PDU that does not receive the HARQ ACK between the first sequence number and the third sequence number as the first PDU, or the serial number in the first serial number.
  • the PDU corresponding to the smallest sequence number between the third serial number is determined as the first PDU, which increases the flexibility of the transmitting end to determine the first PDU.
  • the determining, according to the currently sent PDU, the at least one PDU that does not receive the HARQ ACK includes:
  • determining, according to the at least one PDU that does not receive the HARQ ACK, the first PDU to be retransmitted including:
  • the transmitting end may determine, as the first PDU, at least one PDU that does not receive the HARQ ACK before the third serial number, or the PDU corresponding to the smallest serial number before the third serial number. Determined as the first PDU, the flexibility of the transmitting end to determine the first PDU is increased.
  • the determining, according to the at least one PDU that does not receive the HARQ ACK, determining the first PDU to be retransmitted, and resending the first PDU to the receiving end includes:
  • the transmission opportunity After determining the first PDU to be retransmitted according to the at least one PDU that does not receive the HARQ ACK, performing retransmission of the first PDU to the receiving end, or when determining that there is currently a transmission opportunity, The transmission opportunity sends the first PDU to the receiving end.
  • the first PDU is retransmitted to the receiving end to shorten the duration of retransmitting the first PDU.
  • the method further includes:
  • the transmitting end determines the first PDU, only when the number of the first PDU is greater than or equal to the first preset number, the receiving end Resending the first PDU; or, after determining the first PDU, setting a first timing time, when the first timing time arrives, if the number of the first PDU is greater than or equal to the first preset number, to the receiving end Resending the first PDU.
  • the resending the first PDU to the receiving end includes:
  • the first PDU is not immediately sent to the receiving end, but the timing is set. After the timing is reached, if the first PDU still exists, there is no receiving.
  • the PDU of the HARQ ACK is received, and the number of PDUs that have not received the HARQ ACK is greater than or equal to the second preset number, the PDU that has not received the HARQ ACK in the first PDU is retransmitted to the receiving end. The number of times the transmitting end retransmits the PDU to the receiving end is reduced, thereby reducing the load of the wireless communication system.
  • the method further includes:
  • the PDU that has not received the HARQ ACK is retransmitted to the receiving end.
  • a third timing time may be set, and when the third timing time arrives, There is still a PDU in the PDU that has not received the HARQ ACK, and the sender re-transmits the HARQ ACK to the receiver. PDU.
  • a data retransmission method comprising:
  • the data retransmission method is used by the receiving end, and the receiving end is configured to receive the PDU sent by the sending end.
  • the receiving end needs to be directly determined without waiting for the retiming timer to arrive. Retransmitting the second PDU, and sending a status report for the second PDU to the transmitting end, so that the transmitting end receives the status report of the second PDU, resending the second PDU, and shortening the status of the PDU sent by the receiving end to the sending end.
  • the time of reporting thereby increasing the efficiency of data transmission in wireless communication systems.
  • the sending by the sending end, a status report for the second PDU, to enable the sending end to receive the status report of the second PDU, and resending the second PDU, including:
  • the status report for the second PDU is sent to the sending end, or when the current transmission opportunity exists, the status report of the second PDU is sent to the sending end by using the transmission opportunity.
  • the status report for the second PDU is sent to the sending end to reduce the length of time for the transmitting end to retransmit the second PDU.
  • the determining, according to the sequence number of the currently received protocol data unit PDU, the second PDU that needs to be retransmitted by the sending end includes:
  • the second serial number and the fifth serial number Determining, by the second serial number and the fifth serial number, at least one PDU that is not received as the second PDU, where the fourth serial number is a maximum serial number of the currently continuously received PDU, The fifth serial number is the largest serial number in the serial number of the currently received PDU; or
  • the seventh serial number is the serial number of the PDU that is currently not correctly received.
  • the receiving end may determine the second PDU according to one or more of the fourth sequence number, the fifth sequence number, the sixth sequence number, and the seventh sequence number, and increase the receiving end to determine the second PDU. flexibility.
  • the method before determining, according to the sequence number of the currently received PDU, the second PDU that needs to be retransmitted by the sending end, the method further includes:
  • the receiving end in order to reduce the frequency at which the receiving end sends the status report to the transmitting end, only the number of PDUs whose sequence number is between the fourth sequence number and the fifth sequence number and not received is greater than or equal to the third.
  • the number is preset, the second PDU that needs to be retransmitted by the transmitting end is determined.
  • the method further includes:
  • the fourth timing time is set.
  • the fourth timing time arrives, if the receiving end does not all receive the second PDU, the corresponding sending is sent to the sending end. There is still no status report of the received PDU in the second PDU to ensure that the receiving end receives all the PDUs in the second PDU.
  • a data retransmission apparatus having a function of implementing the behavior of the data retransmission method in the first aspect described above.
  • the data retransmission device includes at least one module for implementing the data retransmission method provided by the above first aspect.
  • a data retransmission apparatus having a function of implementing the behavior of the data retransmission method in the second aspect.
  • the data retransmission device includes at least one module for implementing the data retransmission method provided by the second aspect above.
  • a fifth aspect a data retransmission apparatus is provided, the structure of the data retransmission apparatus comprising a processor and a memory, wherein the memory is used to store the support data retransmission apparatus to perform the foregoing first aspect or the second aspect
  • the processor is configured to execute a program stored in the memory.
  • the operating device of the storage device may further include a communication bus for establishing a connection between the processor and the memory.
  • an embodiment of the present invention provides a computer storage medium for storing computer software instructions used by the data retransmission apparatus provided in the third aspect and the fourth aspect, or stored for performing the foregoing third aspect.
  • the fourth aspect is a program designed for a data retransmission device.
  • the technical solution provided by the embodiment of the present invention has the beneficial effects that the transmitting end determines the first PDU to be retransmitted, and resends the first PDU to the receiving end, without waiting for the receiving end to send a status report for the first PDU, shortening
  • the time at which the transmitting end retransmits the first PDU improves the efficiency of data transmission in the wireless communication system.
  • the receiving end does not need to wait for the timing of the reordering timer to arrive, directly determines the second PDU that needs to be retransmitted by the transmitting end, and sends a status report for the second PDU to the transmitting end, so that the transmitting end receives the second PDU.
  • the status report resends the second PDU, shortening the time when the receiving end sends the PDU status report to the transmitting end, and also improves the data transmission in the wireless communication system. effectiveness.
  • FIG. 1 is a schematic diagram of a data retransmission system according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a network device according to an embodiment of the present invention.
  • 3A is a flowchart of a data retransmission method according to an embodiment of the present invention.
  • FIG. 3B is a schematic diagram of a sending window maintained by a sender according to an embodiment of the present invention.
  • 4A is a flowchart of another data retransmission method according to an embodiment of the present invention.
  • FIG. 4B is a schematic diagram of a receiving window maintained by a receiving end according to an embodiment of the present invention.
  • FIG. 5 is a block diagram of a data retransmission apparatus according to an embodiment of the present invention.
  • FIG. 6 is a block diagram of another data retransmission device according to an embodiment of the present invention.
  • the data retransmission system includes a transmitting end 101 and a receiving end 102, and the transmitting end 101 is configured to send a PDU to the receiving end 102, and receive The terminal 102 is configured to receive the PDU sent by the sending end 101, and send a status report to the sending end 101 for the unreceived PDU.
  • the transmitting end 101 receives the status report for the PDU sent by the receiving end 102
  • the transmitting end 101 retransmits the status report to the receiving end 102.
  • the PDU The transmitting end and the receiving end can communicate by using a wireless or wired manner.
  • the transmitting end and the receiving end can be based on long term evolution (LTE).
  • LTE long term evolution
  • the network performs wireless communication, and can also perform wireless communication based on other networks such as Wideband Code Division Multiple Access (WCDMA) networks.
  • WCDMA Wideband Code Division Multiple Access
  • both the transmitting end and the receiving end are network devices.
  • the network device is a sending end
  • the network device is used to receive data
  • the network device is used.
  • the sending end may be a network device such as a user equipment (UE) or a base station
  • the receiving end may also be a network device such as a UE or a base station, which is not limited in detail in the embodiment of the present invention, in a possible case.
  • the transmitting end is the UE
  • the receiving end is the base station; or when the transmitting end is the base station, the receiving end is the UE.
  • the network device may be the transmitting end 101 or the receiving end 102 shown in FIG. 1.
  • the network device includes a transmitter 201, a receiver 202, a memory 203, a processor 204, and a communication bus 205.
  • the transmitter 201 can be used to transmit data and/or signaling and the like.
  • the receiver 202 can be configured to receive data and/or signaling, etc., when the network device transmits data through the transmitter 201, the network device is a transmitting end, and when the network device receives the device through the receiver 202, the network device is Receiving end.
  • the control planes of the transmitter 201 and the receiver 202 both include an upper layer and a lower layer.
  • the upper layer is used to send instructions to the lower layer and receive information reported by the lower layer, and the lower layer is used to receive the instructions issued by the upper layer. Data transfer.
  • the upper layer may be a Radio Resource Control (RRC) layer or a PDCP layer
  • the lower layer may be a medium access control (Medium). Access Control, MAC) layer and physical layer.
  • RRC Radio Resource Control
  • MAC medium access control
  • the transmitter of the transmitting end receives the target data to be transmitted from the upper layer
  • the target data is integrated into a PDU, and then the PDU is transmitted to the receiver of the receiving end through the lower layer.
  • the receiver at the receiving end receives the PDU through the lower layer, integrates the PDU to obtain the target data, and reports the target to the upper layer to complete the transmission process of the target data from the transmitter at the transmitting end to the receiver at the receiving end.
  • the memory 203 can be used to store one or more software programs and/or modules.
  • the memory 203 may be a read-only memory (ROM), a random access memory (RAM), an electrically erasable programmable read-only memory (EEPROM), or a read-only memory.
  • ROM read-only memory
  • RAM random access memory
  • EEPROM electrically erasable programmable read-only memory
  • CD-ROM Compact Disc Read-Only Memory
  • magnetic disk storage medium or any other medium that can be used to carry or store desired program code in the form of an instruction or data structure and accessible by the integrated circuit, but not Limited to this.
  • the processor 204 can be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more program programs for controlling the present invention. Execution of the integrated circuit.
  • the processor 204 can implement the data retransmission method provided by the embodiments of Figures 3A and 4A described below by running software programs and/or modules stored in the memory 203, as well as invoking data stored in the memory 203.
  • the communication bus 205 can include a path for communicating information between the components.
  • FIG. 3A is a flowchart of a data retransmission method according to an embodiment of the present invention.
  • the data retransmission method is used by a sending end, and the sending end is used to send a PDU to a receiving end.
  • the data retransmission method includes the following steps:
  • Step 301 Determine, according to the currently transmitted PDU, at least one PDU that does not receive the HARQ ACK, and the sent PDU is an RLC PDU or a PDCP PDU.
  • the transmitting end may be based on Forward Error Correction (FEC).
  • FEC Forward Error Correction
  • the mechanism that is, the HARQ mechanism, sends the PDU to the receiving end, that is, when the lower layer of the transmitting end receives the PDU delivered by the upper layer, the PDU is integrated to obtain a transport block, and the error correction capability is encoded for the transport block. Modulation, and then generating a radio frequency signal through the baseband signal, and transmitting the radio frequency signal to the receiving end.
  • the lower layer of the transmitting end buffers the transporting block.
  • the radio frequency signal is decoded, and the HARQ ACK/HARQ incorrect Acknowledgement (NACK) is obtained for the transport block, and the HARQ ACK/HARQ NACK is sent.
  • NACK HARQ ACK/HARQ incorrect Acknowledgement
  • the sender when the sender receives the HARQ NACK through the lower layer, it retransmits the buffered transport block and records the number of retransmissions.
  • the transmitting end receives the HARQ NACK for the transport block through the lower layer after retransmitting the transport block, and continues to retransmit the transport block until the HARQ ACK for the transport block is received or the number of retransmissions reaches a preset number of times, That is, the number of times the HARQ NACK for the PDU corresponding to the transport block is received reaches a preset number of times.
  • the lower layer reports the transport block transmission failure message to the upper layer, and when the upper layer of the transmitting end receives the transmission failure message, And determining, according to the correspondence between the stored transport block and the PDU, the PDU corresponding to the transport block, and retransmitting the PDU to the receiving end.
  • the transmitting end receives the HARQ ACK through the lower layer, the buffer for the transport block is cleared, and it is determined whether the PDU corresponding to the transport block is received by the receiving end, that is, the transmitting end determines whether the PDU is received.
  • the transmitting end may determine, according to the currently transmitted PDU and the transport block corresponding to each PDU, whether the HARQ ACK is received, and at least one PDU of the currently transmitted PDU that does not receive the HARQ ACK.
  • the lower layer of the transmitting end integrates the PDU to obtain a transport block, and stores a correspondence between the PDU and the transport block after the PDU is integrated.
  • the PDU may correspond to one transmission.
  • a block may also correspond to multiple transport blocks.
  • the preset number of times is a preset number of times, and the preset number of times may be 3 times, 5 times, or 7 times, and the like.
  • the PDU sent by the sending end may be a PDU of the RLC layer or a PDU of the PDCP layer, which is not specifically limited in this embodiment of the present invention.
  • the PDU that the PDU sent by the sender is specific to depends on which layer the ARQ function is located. For example, in an existing LTE network, the ARQ function is located at the RLC layer. Therefore, in the existing LTE network, the PDU is a PDU of the RLC layer.
  • each PDU sent by the sending end has its corresponding serial number.
  • the transmitting end After the transmitting end sends the PDU to the receiving end, the transmitting end maintains a sending window, and the lower boundary of the sending window is continuously received before the current time.
  • the maximum sequence number in the PDU to the HARQ ACK is incremented by 1, labeled VT(A), the upper boundary of the transmission window is the lower boundary plus the window size, labeled VT (MS), and the next PDU to be transmitted
  • the serial number is labeled VT(S).
  • the window size is a window size preset by the sender, and the window size is usually 512.
  • the transmitting end may determine, according to the current window, the at least one PDU that does not receive the HARQ ACK, specifically, determines that the HARQ ACK is not received.
  • At least one PDU can be implemented in the following three possible ways.
  • determining the first sequence number and the second sequence number determining that the sequence number is between the first sequence number and the second sequence number and not receiving at least one PDU of the HARQ ACK, where the first sequence number It is the largest sequence number in the serial number of the currently received PDU, and the second sequence number is the sequence number of the current next PDU to be transmitted.
  • the sending end may directly determine the first serial number and the second serial number; or may determine the first serial number and the second serial number when the upper layer of the transmitting end receives the transmission failure message for one transport block. That is, when the upper layer of the transmitting end receives the transmission failure message for one transport block, the transmitting end detects that the number of HARQ NACKs for the first target PDU reaches a preset number of times, and the first target PDU is corresponding to the transport block. PDU. At this time, the transmitting end needs to retransmit the PDU that has not received the HARQ ACK in the PDU that has been sent before the current time.
  • the transmitting end In order to determine the PDU that has not received the HARQ ACK in the PDU that was sent before the current time, the transmitting end needs to First, the first sequence number and the second sequence number are determined first, that is, the maximum sequence number in the sequence number of the PDU that continuously receives the HARQ ACK before the current time and the sequence number of the next PDU to be transmitted at the current time need to be determined first.
  • the sending end stores the receiving end corresponding to each PDU in the sending window, that is, for each PDU in the sending window,
  • the PDU is marked as a PDU that has been acknowledged to be received.
  • the transmitting end has not determined that the PUD is received by the receiving end, the PDU is marked as an unreceived PDU. Therefore, after determining the first sequence number and the second sequence number according to the sending window, the transmitting end may further mark the PDU according to each PDU in the sending window. In the case, it is determined that the sequence number is located in at least one PDU in which at least one PDU between the first sequence number and the second sequence number does not receive the HARQ ACK.
  • FIG. 3B is a schematic diagram of a transmission window maintained by a sender according to an embodiment of the present invention.
  • a block filled with a tight left diagonal stripe indicates a PDU that continuously receives a HARQ ACK before the current time, where the rightmost side
  • the closely packed left diagonally striped squares represent the PDU corresponding to the largest serial number in the serial number of the PDU that continuously receives the HARQ ACK before the current time, that is, the PUD corresponding to the first serial number;
  • the squared representation sequence of the evacuated left diagonal stripes The number is greater than the first serial number and determines the PDU that received the HARQ ACK;
  • the white-filled square indicates the PDU that was sent before the current time but did not receive the HARQ ACK;
  • the black-filled square indicates the PDU to be sent at the current time, that is, the first The PDU corresponding to the second serial number, and the serial number corresponding to the PDU is marked as VT(S).
  • the transmitting end determines the PDU indicated by the white-filled block between the PDU corresponding to the first sequence number and the PDU corresponding to the second sequence number, that is, determining that at least one PDU is not received. PDU to HARQ ACK.
  • determining a first sequence number and a third sequence number determining at least one PDU of the sequence number between the first sequence number and the third sequence number that does not receive the HARQ ACK, wherein the first sequence The number is the largest sequence number in the serial number of the currently received PDU, and the third sequence number is the smallest sequence number in the sequence number of the PDU that is larger than the first sequence number and receives the HARQ ACK.
  • the rightmost left-left diagonally-filled square indicates the PDU corresponding to the largest sequence number in the sequence number of the PDU that continuously receives the HARQ ACK before the current time, that is, the PUD corresponding to the first serial number
  • the most The square of the left left oblique stripe padding indicates that the sequence number is greater than the first sequence number and determines the smallest sequence number in the sequence number of the HARQ ACK received, that is, the PDU corresponding to the third sequence number, and therefore, according to the current transmission window,
  • the first serial number and the third serial number can be directly determined.
  • the third sequence number is determined, and at least one PDU whose sequence number is not before the third sequence number that does not receive the HARQ ACK is determined, where the third sequence number is the sequence number of the currently discontinuous received PDU.
  • the sending end may directly determine the third serial number according to the current sent window, and determine at least one PDU that does not receive the HARQ ACK before the third serial number, and increase the sending end determination.
  • the flexibility of at least one PDU that does not receive the HARQ ACK is determined.
  • the third sequence number is the smallest sequence number in the sequence number of the currently discontinuously received PDU, that is, the sequence number is greater than the first sequence number and determines the smallest sequence number in the sequence number of the HARQ ACK received.
  • Step 302 Determine, according to at least one PDU that does not receive the HARQ ACK, the first PDU to be retransmitted, and resend the first PDU to the receiving end.
  • step 301 since it is determined in step 301 that there are three possible implementation manners of at least one PDU that does not receive the HARQ ACK, accordingly, according to at least one PDU that does not receive the HARQ ACK, the first to be retransmitted is determined. There are also three possible ways for a PDU.
  • At least one PDU whose sequence number is between the first sequence number and the second sequence number that does not receive the HARQ ACK is determined as the first PDU. Since the sequence number is located in at least one PDU between the first sequence number and the second sequence number, there may be multiple PDUs that do not receive the HARQ ACK, and therefore, according to the PDU in the at least one PDU that does not receive the HARQ ACK, it is determined that the PDU is to be heavy.
  • the first PDU transmitted may be: at least one PDU All the PDUs that have not received the HARQ ACK are determined as the first PDU to be retransmitted; or the PDU whose smallest sequence number in the PDU of the at least one PDU that does not receive the HARQ ACK is determined as the first PDU to be retransmitted; or When there are at least two consecutive PDUs in the PDU that does not receive the HARQ ACK in the at least one PDU, and at least two consecutive PDUs include the PDU with the smallest sequence number in the PDU that does not receive the HARQ ACK in the at least one PDU, The at least two consecutive PDUs are determined to be the first PDU to be retransmitted.
  • the transmitting end may send, to the receiving end, all the PDUs that do not receive the HARQ ACK between the first sequence number and the second sequence number in the current sending window, or may send the first sequence number in the current sending window to the receiving end. All one or more PDUs in the PDU that do not receive the HARQ ACK between the second sequence numbers.
  • At least one PDU whose sequence number is between the first sequence number and the second sequence number that does not receive the HARQ ACK is determined as the first PDU, that is, the sequence numbers are in VT(S) and VT(A).
  • the PDU between and without receiving the HARQ ACK is determined as the first PDU.
  • the PDU whose sequence number is between VT(S) and VT(A) and does not receive the HARQ ACK may be directly determined as the first PDU, and may be VT(S)-VT(A) or When the first preset value is greater than or equal to, the PDU whose sequence number is between VT(S) and VT(A) and does not receive the HARQ ACK is determined as the first PDU, and the first PDU is retransmitted.
  • VT(S)-VT(A) when VT(S)-VT(A) is greater than 0, that is, there is at least one PDU that has been sent but does not receive the HARQ ACK between VT(S)-VT(A), start timer T1, and configure The maximum running time of timer T1 is K1. If VT(S)-VT(A) is greater than or equal to the second preset value when timer T1 times out, the serial number is in VT(S) and VT(A).
  • the PDUs that have not received the HARQ ACK are determined as the first PDU and retransmit the first PDU, otherwise if VT(S)-VT(A) is less than the second preset value but greater than zero when the timer T1 times out Then, the timer T1 is restarted.
  • At least one PDU that does not receive the HARQ ACK between the first sequence number and the third sequence number is determined as the first PDU, or the sequence number is in the first sequence number and The PDU corresponding to the smallest sequence number between the third sequence numbers is determined as the first PDU.
  • the transmitting end may determine, as the first PDU, a PDU that does not receive the HARQ ACK between the first sequence number and the third sequence number. Since there may be more than one PDU between the first sequence number and the third sequence number that does not receive the HARQ ACK, the sender may send the minimum sequence between the first sequence number and the third sequence number in the current transmission window to the receiving end.
  • the PDU corresponding to the number may also send one or more PDUs of all the PDUs between the first sequence number and the third sequence number in the current transmission window to the receiving end.
  • a third possible implementation manner is to determine at least one PDU that does not receive the HARQ ACK with the sequence number before the third sequence number as the first PDU, or determine the PDU corresponding to the smallest sequence number before the third sequence number as First PDU.
  • At least one PDU that does not receive the HARQ ACK with the sequence number before the third sequence number can be directly directly determined in the sending window that is currently maintained by the sending end.
  • the first PDU is determined as the first PDU, or the PDU corresponding to the smallest serial number before the third serial number is determined as the first PDU, and the first PDU is not determined by the first serial number.
  • the transmitting end in order to shorten the length of time for the transmitting end to retransmit the first PDU, when determining the first PDU to be retransmitted according to the at least one PDU that does not receive the HARQ ACK, performing the first retransmission to the receiving end is performed.
  • the PDU or when it is determined that there is currently a transmission opportunity, transmits the first PDU to the receiving end through the transmission opportunity.
  • the transmission opportunity is a resource for sending data allocated by the system to the sending end every preset time period, and the preset duration is usually 1 s.
  • the wireless communication system is overloaded. After the sender determines the first PDU, the following two strategies can be adopted.
  • the transmitting end may not resend the first PDU to the receiving end immediately, but when the number of the first PDU is greater than or equal to the first preset number. And then resend the first PDU to the receiving end.
  • the first preset number may be a preset number of the sending end, and the first preset number may be 2, 3, or 5, and the like.
  • the sending end resends the first PDU to the receiving end, and may be classified into the following two situations:
  • the sending end determines the first PDU
  • the number of the first PDU is determined.
  • the number of the first PDU is greater than or equal to the first preset number, performing the resending of the first PDU to the receiving end step.
  • the first preset number is 3.
  • the number of the first PDU is determined, if the first PDU If the number of the first PDU is less than or equal to 3, the transmitting end will not resend the first PDU to the receiving end. If the number of the first PDU is greater than or equal to 3, the transmitting end resends the first PDU to the receiving end.
  • the first timing time is set, and the timing is started.
  • the step of determining the first PDU to be retransmitted according to the at least one PDU that does not receive the HARQ ACK is re-executed, if the first When the number of PDUs is greater than or equal to the first preset number, the step of resending the first PDU to the receiving end is performed.
  • the lower boundary of the transmission window always keeps the maximum sequence number in the PDU that continuously receives the HARQ ACK before the current time plus 1, so if the sender is in the first timing time
  • the transmitting end updates the sending window of the current time according to the serial number of the PDU, that is, when the first timing time arrives, the transmitting end needs to re-execute according to the failure to receive the HARQ ACK.
  • At least one PDU the step of determining the first PDU to be retransmitted.
  • the operation of setting the first timing time and starting timing is re-executed.
  • the first timing time is a preset time set by the sending end, and the first timing time may be 1 ms or 2 ms.
  • the sender sets the first time and starts timing by starting the timer.
  • the first timing is 1 ms
  • the first preset number is 3.
  • the transmitting end starts the first timer when determining, in the at least one PDU, all the PDUs that do not receive the HARQ ACK as the first PDU to be retransmitted.
  • the timing of the first timer is 1 ms.
  • the time of 1 ms arrives, if the number of the first PDU is greater than or equal to 3, the first PDU is resent to the receiving end.
  • the first timer is restarted, and timing is started, and the above steps are cyclically executed.
  • the second strategy when the transmitting end determines the first PDU, does not immediately resend the first PDU to the receiving end, but delays sending the first PDU, that is, the transmitting end sets the second timing after determining the first PDU. Time, and start timing; when the second timing time arrives, it is determined whether there is a PDU in the first PDU that has not received the HARQ ACK; when there is a PDU in the first PDU that has not received the HARQ ACK, and has not received yet
  • the number of PDUs of the HARQ ACK is greater than or equal to the second preset number, the PDU that has not received the HARQ ACK in the first PDU is retransmitted to the receiving end; if the second timing time is reached, the transmitting end receives the PDU.
  • ACK of all PDUs in a PDU is not performed, no operation is performed; or when the number of PDUs that have not received the HARQ ACK is less than the second preset number when the second timing time arrives
  • the second time is a preset time in the sending end. It is noted that, in order to prevent the sending end from waiting for a long time after determining the first PDU, the second time is not too long, usually less than 1 ms. Due to The timing of the low latency timer is usually short, so the transmitter sets the second timing and starts timing by enabling the low latency timer.
  • the transmitting end may use the first policy or the second policy separately to prevent the sending end from retransmitting the PDU times to the receiving end too frequently, and may also use the first type of policy and the first Two strategies are to prevent the sender from retransmitting the PDU to the receiver too frequently.
  • N is a preset value
  • the transmitting end will N
  • the PDU that has been transmitted but has not received the HARQ ACK is determined to be the first PDU, that is, the sender determines to perform retransmission for the N PDUs that have received but not received the HARQ ACK.
  • the retransmission may be performed immediately, or a low delay timer may be set to determine the retransmission time, that is, if at least one of the N PDUs that have received but not received the HARQ ACK is still after the low delay timer expires If there is no successful transmission, that is, there are PDUs that have not received the HARQ ACK in the PDUs that have been sent but not received the HARQ ACK, and the transmitting end retransmits the PDU that has not received the HARQ ACK.
  • the first PDU may also be determined according to whether the PDU after the third sequence number receives the HARQ ACK. For example, if the current minimum PDU that has not been correctly transmitted, that is, the PDU corresponding to VT(A), or one X (X is a preset value) has received the PDU of the HARQ ACK, the sender determines that the current The smallest PDU that has not received the HARQ ACK, that is, the PDU whose sequence is VT(A), performs retransmission.
  • the currently smallest PDU that has not received the HARQ ACK that is, the PDU corresponding to VT (A) and the largest PDU that has received the HARQ ACK (that is, the PDU corresponding to the sequence number of VT (S)-1)
  • the PDU that has not received the HARQ ACK is retransmitted.
  • the transmitting end when the transmitting end resends the first PDU to the receiving end, the transmitting end may select the same link as the last PDU transmission for transmission.
  • the transmitting end may also select a different link from the last PDU transmission for transmission.
  • the transmitting end in order to ensure that the receiving end all receives the first PDU, after the transmitting end resends the first PDU to the receiving end, setting a third timing time and starting timing; when the third timing time arrives And determining, by the first PDU, whether there is a PDU that does not receive the HARQ ACK; when there is still a PDU that does not receive the HARQ ACK in the first PDU, retransmitting the PDU that has not received the HARQ ACK to the receiving end.
  • the third timing time is a preset timing time in the transmitting end, and the third timing time may be 2 ms or 3 ms.
  • the transmitting end determines the first PDU to be retransmitted, and resends the first PDU to the receiving end, without waiting for the receiving end to send a status report for the first PDU, shortening the retransmission of the transmitting end.
  • the time of a PDU thereby improving the efficiency of data transmission in a wireless communication system.
  • FIG. 4A is a flowchart of another data retransmission method according to an embodiment of the present invention.
  • the data retransmission method is used by a receiving end, and the receiving end is configured to receive a PDU sent by a sending end, as shown in FIG. 4A, where the data is heavy.
  • the method of transmission includes the following steps:
  • Step 401 Determine, according to the sequence number of the currently received PDU, a second PDU that needs to be retransmitted by the sending end, and the currently received PUD is an RLC PDU or a PDCP PDU.
  • the PDU is sent to the receiving end according to the FEC mechanism, that is, the HARQ mechanism, for the transmitting end.
  • the receiving end receives the radio frequency signal sent by the transmitting end through the lower layer, performs decoding processing on the radio frequency signal, obtains a transport block corresponding to the radio frequency signal, and determines a HARQ ACK HARQ/NACK for the transport block, when determining For the HARQ ACK of the transport block, the received transport block is processed to obtain the PDU corresponding to the transport block, and the PDU is sent to the upper layer, that is, the receiving end determines that the PDU is received.
  • the FEC mechanism that is, the HARQ mechanism
  • the receiving end when the receiving end receives the PDU sent by the transmitting end, according to the serial number of the received PDU, the receiving end maintains a receiving window, and the lower boundary of the receiving window is continuously received before the current time.
  • the maximum sequence number of the PDU is incremented by 1, labeled VR(R).
  • the upper boundary of the receive window is the lower boundary plus the window size, labeled VR(H).
  • the transmission window is updated, that is, VR(R) and VR(H) are updated.
  • the window size is a preset window size of the receiving end, and the receiving window has the same size as the sending window of the sending end, which is usually 512.
  • the receiving end determines that all the PDUs before a certain PDU are received, that is, when the receiving end determines the PDUs that are continuously received before the current time, the receiving end continuously receives the PDU through the layer where the current PDU is located.
  • the PDU is handed over to the upper layer. Therefore, in the receiving window maintained by the receiving end, the lower boundary of the receiving window is always maintained as the maximum sequence number of the PDU continuously received before the current time plus 1, that is, the receiving window maintained by the receiving end includes the incorrect receiving. PUD.
  • the receiving end may determine, according to the currently received receiving window, the second PDU that needs to be retransmitted by the transmitting end, that is, the receiving end determines, according to the currently maintained receiving window, the PDU that is not correctly received at the current time.
  • FIG. 4B is a schematic diagram of a receiving window maintained by a receiving end according to an embodiment of the present invention. As shown in FIG. 4B, a square-filled square indicates a PDU continuously received before the current time, where the rightmost horizontal stripe is filled.
  • the squares indicate the PDU corresponding to the maximum sequence number of the PDUs received consecutively before the current time, that is, the PDU corresponding to the fourth serial number; the squares filled with the oblique squares indicate that the serial number has been received before the current time and the serial number is greater than the fourth sequence.
  • the PDU of the number, wherein the last square filled with diagonal squares indicates the PDU with the largest serial number in the PDU received before the current time, that is, the PDU corresponding to the fifth serial number, and the leftmost is filled with oblique squares.
  • the squares indicate that the PDU of the PDU received before the current time is greater than the fourth serial number and the smallest PDU corresponding to the smallest serial number, that is, the PUD corresponding to the sixth serial number, and the sixth serial number may also be marked as VR. (L); the square filled by the right diagonal stripes indicates the PDU to be received at the current time, marked as VR(H); the white-filled square indicates that the serial number is smaller than the PDU to be received at the current time.
  • the column number is not received PDU received at which the leftmost white filled squares labeled seventh PDU corresponding to the sequence number, may be labeled labeled VR (MS).
  • the receiving end determines that the second PDU that needs to be retransmitted by the transmitting end can be classified into the following cases.
  • the at least one PDU whose sequence number is between the fourth sequence number and the fifth sequence number and is not received is determined as the second PDU, and the fourth sequence number is the maximum sequence number of the currently continuously received PDU.
  • the fifth sequence number is the largest sequence number in the serial number of the currently received PDU.
  • the receiving end when the receiving end determines the PDU that is continuously received before the current time, the receiving end hands over the continuously received PDU to the upper layer through the layer where the current PDU is located, and therefore, the fourth serial number It can also be the largest serial number in the PDU sequence number currently submitted to the upper layer.
  • the receiving end feeds back VR(R)-1 and VR to the transmitting end.
  • the at least one PDU whose sequence number is between the fourth sequence number and the sixth sequence number is determined as the second PDU, and the sixth sequence number is the sequence of the PDU with the smallest sequence number in the received PDU that is not currently connected. number.
  • the PDU corresponding to the fourth sequence number or the PDU whose sequence number is VR(R)-1) and the earliest correctly received PDU are currently stored.
  • the sequence number is triggered in VR(R)-1 and VR(L).
  • the status report feedback is not performed between the incorrectly received PDUs, that is, the receiving end sends a status report to the transmitting end for the incorrectly received PDUs with sequence numbers between VR(R)-1 and VR(L).
  • the receiving end may send the sequence number and sequence number of the PDU whose sequence number is between VR(R)-1 and VR(L) and the first one is not correctly received in VR(R)-1 and VR(L).
  • At least one PDU whose sequence number is before the fifth sequence number and is not received is determined as the second PDU.
  • At least one PDU whose sequence number is before the sixth serial number and is not received is determined as the second PDU.
  • the receiving end The sequence number of the incorrectly received PDU whose sequence number is before VR(L) is fed back to the sender.
  • the at least one PDU whose sequence number is the seventh serial number and whose sequence number is after the seventh serial number and is not received is determined as the second PDU, and the seventh serial number is the sequence of the PDU that is currently not correctly received.
  • the incorrect reception is performed.
  • the serial number of the first incorrectly received PDU is fed back to the transmitting end, or the first incorrectly received PDU and the subsequent serial number of the Y incorrectly received PDUs are fed back to the transmitting end.
  • the receiving end may use the reordering timer to perform the reordering operation, or may not use the reordering timer to perform the reordering operation.
  • the receiving end uses the reordering timer to perform the reordering operation, when the timing of the reordering timer is reached, if the receiving end has not received the PDU that failed to receive the triggering of the reordering timer, the receiving end will determine The incorrectly received PDU is a lost PDU. Therefore, the seventh serial number may also be the serial number of the PDU whose serial number is the smallest among the PDUs that have been determined to have been lost. When the seventh serial number is the serial number of the PDU whose serial number is the smallest among the PDUs that have been determined to have been lost, the seventh serial number is marked as VR(R).
  • the receiving end uses the reordering timer to perform the reordering operation, if the first one determines that the PDU that has been lost (that is, the PDU whose serial number is VR(R)), there is M (M is the preset value) which is incorrect. Receiving the PDU, feeding back to the transmitting end the first sequence number of the PDU that has been determined to be lost, or feeding back to the transmitting end the first PDU that has been determined to have been lost and the sequence number of the following M incorrectly received PDUs are sent to the transmitting end. .
  • M incorrectly received PDUs Includes PDUs that have been determined to be lost.
  • the PDU corresponding to the smallest sequence number between the fourth sequence number and the sixth sequence number is determined as the second PDU.
  • the fourth sequence, the fifth sequence, the sixth sequence, and the seventh sequence number are sequence numbers in the receiving window currently maintained by the receiving end, that is, in the embodiment of the present invention, the receiving end may be configured according to One or more of the fourth sequence, the fifth sequence, the sixth sequence, and the seventh sequence determine the second PDU.
  • the PDU received by the receiving end may be a PDU of the RLC layer, or may be a PDU of the PDCP layer, which is not specifically limited in this embodiment of the present invention.
  • the PDU that the PDU received by the receiving end is specific to depends on which layer the ARQ function is located. For example, in an existing LTE network, the ARQ function is located at the RLC layer. Therefore, in the existing LTE network, the PDU is a PDU of the RLC layer.
  • the second PDU may be directly determined, or the second PDU may be determined when the fourth serial number and the sixth serial number are not consecutive. That is, when the fourth sequence number and the sixth sequence number are not consecutive, it indicates that there is a PDU that has been sent by the sender but not received by the receiver at the current time. At this time, the receiver may send the PDU that was not correctly received before the current time. status report.
  • Step 402 Send a status report for the second PDU to the sending end, so that the sending end retransmits the second PDU after receiving the status report of the second PDU.
  • the receiving end may immediately perform the sending of the status for the second PDU to the transmitting end when determining the second PDU.
  • Reporting, or determining that a current transmission opportunity exists transmitting, by the transmission opportunity, a status report of the second PDU to the transmitting end, where the transmission opportunity is a resource allocated by the system for the receiving end to transmit data every preset time period, the preset The duration is usually 1s.
  • the receiving end may further determine the serial number in the first The number of PDUs between the four sequence numbers and the fifth sequence number that are not received; when the sequence number is between the fourth sequence number and the fifth sequence number and the number of unreceived PDUs is greater than or equal to the third pre- When the number is set, the second PDU that needs to be retransmitted by the transmitting end is determined according to the third serial number and the fourth serial number, and the status report for the second PDU is sent to the transmitting end.
  • the receiving end does not immediately determine the second PDU, but when determining that the sequence number is between the fourth sequence number and the fifth sequence number and the number of unreceived PDUs is greater than the second preset number, The second PDU is determined and a status report for the second PDU is sent to the sender.
  • the third preset number is a preset number in the receiving end, and the third preset number may be 2, 3, or 5, and the like.
  • the receiving end determines the number of PDUs whose sequence number is between the fourth sequence number and the fifth sequence number and does not receive, that is, determines the number of PDUs that were not correctly received before the current time, before the current time. If the number of PDUs that are not correctly received is greater than 3, the transmitting end may determine the second PDU according to the six conditions of the second PDU that is determined to be retransmitted by the transmitting end in step 401, and send a status report for the second PDU to the sending end. . Accordingly, when the number of PDUs that were not correctly received before the current time is less than or equal to 3, no operation is required.
  • the receiving end may further set the fourth timing time. And start timing; when the fourth timing time arrives, it is judged whether all the second PDUs are received; when not all the second PDUs are received, the status of the PDUs that have not been received in the second PDU is retransmitted to the transmitting end. report.
  • the fourth timing time is a preset time set by the receiving end, and the fourth timing time may be 1 ms, 2 ms or 3ms and so on.
  • the timer T2 is started, and before the timing time of the timer T2 arrives, the status report for the second PDU is not repeatedly sent to the sending end, if The timer T2 is terminated when the receiving end has determined that all the PDUs in the second PDU are correctly received before the timing of the timer T2 arrives. If at least one PDU in the second PDU is not correctly received when the timing of the timer T2 arrives, the status report is re-transmitted to the sender according to the latest receiving status, that is, the second PDU is sent to the sending end. Status report of PDUs that have not been received correctly.
  • the second PDU that needs to be retransmitted by the transmitting end is directly determined without waiting for the timing of the reordering timer to arrive.
  • the sending end sends a status report for the second PDU, so that the sending end re-transmits the second PDU when receiving the status report of the second PDU, shortening the time for the receiving end to send the PDU status report to the sending end, and the wireless communication is also improved. The efficiency of data transfer in the system.
  • FIG. 5 is a data retransmission device 500 according to an embodiment of the present invention.
  • the data retransmission device may be implemented as part or all of a network device by using software, hardware, or a combination of the two.
  • the network device may be as shown in FIG. 2 .
  • a first determining module 501 configured to perform step 301 in the embodiment of FIG. 3A;
  • the second determining module 502 is configured to perform step 302 in the embodiment of FIG. 3A.
  • the first determining module 501 includes a first determining unit and a second determining unit:
  • a first determining unit configured to determine a first serial number and a second serial number, where the first serial number is the largest serial number in the serial number of the currently consecutive received PDU, and the second serial number is the current next PDU to be sent.
  • a second determining unit configured to determine, by the first sequence number and the second serial number, the at least one PDU that does not receive the HARQ ACK;
  • the second determining module 502 includes a third determining unit:
  • a third determining unit configured to determine, as the first PDU, at least one PDU that does not receive the HARQ ACK between the first sequence number and the second sequence number.
  • the first determining module 501 includes a fourth determining unit and a fifth determining unit:
  • a fourth determining unit configured to determine a first serial number and a third serial number, where the first serial number is a maximum serial number in a serial number of the currently consecutive received PDU, and the third serial number is greater than the first serial number and received The smallest sequence number in the sequence number of the PDU to the HARQ ACK;
  • a fifth determining unit configured to determine, by the first sequence number and the third sequence number, the at least one PDU that does not receive the HARQ ACK;
  • the second determining module comprises a sixth determining unit:
  • a sixth determining unit configured to determine at least one PDU that does not receive the HARQ ACK between the first sequence number and the third sequence number as the first PDU, or the serial number in the first serial number and the first The PDU corresponding to the smallest sequence number between the three serial numbers is determined as the first PDU.
  • the first determining module includes a seventh determining unit and an eighth determining unit:
  • a seventh determining unit configured to determine a third serial number, where the third serial number is a minimum serial number in a serial number of the currently discontinuous received PDU;
  • An eighth determining unit configured to determine at least one PDU that does not receive the HARQ ACK with the sequence number before the third sequence number
  • the second determining module comprises a ninth determining unit:
  • a ninth determining unit configured to determine, as the first PDU, at least one PDU that does not receive the HARQ ACK with the sequence number before the third sequence number, or determine the PDU corresponding to the smallest sequence number before the third sequence number as the first PDU A PDU.
  • the second determining module comprises an execution unit:
  • An execution unit configured to perform retransmission of the first PDU to the receiving end immediately after determining the first PDU to be retransmitted according to the at least one PDU that does not receive the HARQ ACK, or pass the transmission when it is determined that the current transmission opportunity exists The opportunity sends the first PDU to the receiving end.
  • the apparatus 500 further includes a third determining module and a first timing module:
  • a third determining module configured to determine a number of the first PDU, when the number of the first PDU is greater than or equal to the first preset number, performing resending the first target PDU to the receiving end;
  • a first timing module configured to set a first timing time, and start timing.
  • the first timing time arrives, re-execute the first PDU to be retransmitted according to at least one PDU that does not receive the HARQ ACK, if the first When the number of PDUs is greater than the first preset number, the first PDU is resent to the receiving end.
  • the second determining module 502 includes a timing unit, a determining unit, and a sending unit:
  • timing unit for setting a second timing time and starting timing
  • a determining unit configured to determine, when the second timing time arrives, whether there is a PDU in the first PDU that has not received the HARQ ACK;
  • a sending unit configured to resend to the receiving end when there is a PDU in the first PDU that has not received the HARQ ACK, and the number of PDUs that have not received the HARQ ACK is greater than or equal to the second preset number A PDU that has not received a HARQ ACK has been received in a PDU.
  • the apparatus 500 further includes a second timing module, a determining module, and a sending module:
  • a second timing module for setting a third timing time and starting timing
  • a determining module configured to determine, when the third timing time arrives, whether the first PDU has a PDU that does not receive the HARQ ACK;
  • a sending module configured to resend the PDU that has not received the HARQ ACK to the receiving end when there is still a PDU that does not receive the HARQ ACK in the first PDU.
  • the first PDU to be retransmitted is determined, and the first PDU is retransmitted to the receiving end, without waiting for the receiving end to send a status report for the first PDU, which shortens the retransmission of the first PDU by the transmitting end. Time, thereby increasing the efficiency of data transmission in a wireless communication system.
  • the data retransmission apparatus provided by the foregoing embodiment is used for data retransmission, only the division of the foregoing functional modules is illustrated. In actual applications, the foregoing function assignment may be completed by different functional modules as needed. The internal structure of the device is divided into different functional modules to perform all or part of the functions described above.
  • the data retransmission apparatus provided in the foregoing embodiment is the same as the data retransmission method provided in the embodiment of FIG. 3A, and the specific implementation process is detailed in the embodiment of FIG. 3A, and details are not described herein again.
  • FIG. 6 is a data retransmission device 600, which may be implemented as part or all of a network device by software, hardware, or a combination of the two.
  • the network device may be as shown in FIG. 2 .
  • Network design Ready Referring to FIG. 6, the apparatus includes a first determining module 601 and a transmitting module 602.
  • the sending module 602 is configured to perform step 402 in the embodiment of FIG. 4A.
  • the sending module 602 includes an execution unit:
  • an execution unit configured to immediately send a status report for the second PDU to the sending end, or determine, when the current transmission opportunity exists, send a status report of the second PDU to the sending end by using the transmission opportunity.
  • the first determining module 601 includes:
  • a first determining unit configured to determine at least one PDU whose sequence number is between the fourth sequence number and the fifth sequence number and not received as the second PDU, where the fourth sequence number is the maximum sequence of the currently consecutive received PDUs No., the fifth serial number is the largest serial number in the serial number of the currently received PDU;
  • a second determining unit configured to determine, as the second PDU, the at least one PDU whose sequence number is between the fourth serial number and the sixth serial number, where the sixth serial number is the PDU with the smallest sequence number in the received PDU that is not currently connected. Serial number; or,
  • a third determining unit configured to determine, as the second PDU, the at least one PDU whose sequence number is before the fifth serial number and that is not received;
  • a fourth determining unit configured to determine, as the second PDU, the at least one PDU whose sequence number is before the sixth serial number and that is not received;
  • a fifth determining unit configured to determine, as the second PDU, the at least one PDU whose sequence number is the seventh serial number and whose sequence number is after the seventh serial number, and the seventh serial number is the PDU that is not correctly received currently.
  • a sixth determining unit configured to determine a PDU corresponding to the smallest sequence number between the fourth sequence number and the sixth sequence number as the second PDU.
  • the apparatus 600 further includes a second determining module and an executing module:
  • a second determining module configured to determine a number of PDUs whose sequence number is between the fourth sequence number and the fifth sequence number and that are not received
  • An execution module configured to send, when the sequence number is between the fourth serial number and the fifth serial number, that the number of unreceived PDUs is greater than or equal to a third preset number, send a status to the second PDU to the sending end. report.
  • the device 600 further includes a timing module, a determining module, and a second sending module:
  • timing module for setting a fourth timing time and starting timing
  • a judging module configured to determine, when the fourth timing time arrives, whether the second PDU is all received
  • a second sending module configured to: when not all the second PDUs are received, send a status report to the sending end for the PDUs that are not yet received in the second PDU.
  • the receiving end does not need to wait for the timing of the reordering timer to arrive, directly determines the second PDU that needs to be retransmitted by the transmitting end, and sends a status report for the second PDU to the transmitting end, so that the sending end is Receiving the status report of the second PDU, resending the second PDU, shortening the time for the receiving end to send the PDU status report to the transmitting end, and improving the efficiency of data transmission in the wireless communication system.
  • the data retransmission apparatus provided by the foregoing embodiment is used for data retransmission, only the division of the foregoing functional modules is illustrated. In actual applications, the foregoing function assignment may be completed by different functional modules as needed. The internal structure of the device is divided into different functional modules to perform all or part of the functions described above.
  • the data retransmission apparatus provided in the foregoing embodiment is the same concept as the data retransmission method provided in the embodiment of FIG. 4A. The specific implementation process is detailed in the embodiment of FIG. 4A, and details are not described herein again.
  • a person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium.
  • the storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.

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  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

本发明实施例提供了一种数据重传方法，涉及通信技术领域，所述方法包括：发送端确定待重传的第一PDU，并向接收端重新发送该第一PDU，无需等待接收端发送针对该第一PDU的状态报告；接收端无需等待重排序计时器的计时时间到达，直接确定需要发送端重传的第二PDU，并向发送端送针对第二PDU的状态报告，使发送端向接收端重传第二PDU。本发明实施例提供的两种数据重传方法，都可以缩短发送端重传PDU的时间，从而提高无线通信系统中数据传输的效率。

Description

数据重传方法及装置 技术领域
本发明实施例涉及通信技术领域，特别涉及一种数据重传方法及装置。
背景技术
在无线通信系统中，当发送端向接收端发送数据之后，为了确保该数据能够被接收端接收到，发送端可能会进行数据重传，也即重新向接收端发送该数据。目前，在无线通信系统中，发送端进行数据重传主要是基于自动重传请求(Automatic Repeat Request，ARQ)机制完成的。
通常发送端是以协议数据单元(Protocol Data Unit，PDU)的形式向接收端发送数据。具体地，基于ARQ机制进行数据重传的实现过程可以为：在发送端向接收端发送PDU的过程中，每个PDU都有其对应的序列号，且每个PDU的序列号是按照首次发送该PDU的顺序依次增大。当接收端检测到当前接收的PUD的序列号和当前时间之前且距离当前时间最近一次接收的PDU的序列号不连续时，接收端将启动重排序计时器，为了便于说明，将序列号小于上述当前接收的PUD的序列号且还没有接收到的PDU称为目标PDU，当重排序计时器的时间到达时，若接收端仍没有接收到上述目标PDU，则接收端将向发送端发送针对上述目标PDU的状态报告，当发送端接收到针对该目标PDU的状态报告时，重新向接收端发送该目标PDU，以确保接收端可以接收到该目标PDU。
在基于ARQ机制进行数据重传的过程中，发送端是否进行PDU重传依赖于接收端发送的状态报告，而接收端发送的状态报告是在重排序计时器的时间到达且还没有接收到该PDU时发送，也即，当接收端检测到没有接收到PDU时，发送端至少还需等待一个重排序计时器的计时时间，才能向接收端重传该PDU，影响无线通信系统中数据传输的效率。
发明内容
为了解决基于ARQ机制进行数据重传过程中的时延较长的问题，本发明实施例提供了一种数据重传方法及装置。所述技术方案如下：
第一方面，提供了一种数据重传方法，所述方法包括：
根据当前已发送的协议数据单元PDU，确定没有接收到混合自动重传(Hybrid Automatic Repeat Request，HARQ)正确接收确认(Acknowledgement，ACK)的至少一个PDU，所述已发送的PDU为无线链路控制(Radio Link Control，RLC)PDU或者分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)PDU；
根据所述没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU，并向接收端重新发送所述第一PDU。
需要说明的是，该数据重传方法用于发送端，该发送端用于向接收端发送PDU，因此，在本发明实施例中，确定待重传的第一PDU，并向接收端重新发送该第一PDU，无需等待接收端发送针对该第一PDU的状态报告，缩短了发送端重传第一PDU的时间，从而提高 了无线通信系统中数据传输的效率。
可选地，所述根据当前已发送的PDU，确定没有接收到HARQ ACK的至少一个PDU，包括：
确定第一序列号和第二序列号，所述第一序列号为当前连续接收到的PDU的序列号中的最大序列号，所述第二序列号为当前下一个待发送的PDU的序列号；
确定序列号在所述第一序列号和所述第二序列号之间的没有接收到HARQ ACK的至少一个PDU；
相应地，所述根据所述没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU，包括：
将序列号在所述第一序列号和所述第二序列号之间的至少一个没有接收到HARQ ACK的PDU确定为第一PDU。
在本发明实施例中，由于第二序列号为当前下一个待发送的PDU的序列号，因此根据第一序列号和第二序列号确定第一PDU，可以增加待重传的PDU的范围。
可选地，所述根据当前已发送的PDU，确定没有接收到HARQ ACK的至少一个PDU，包括：
确定第一序列号和第三序列号，所述第一序列号为当前连续接收到的PDU的序列号中的最大序列号，所述第三序列号为大于所述第一序列号且接收到HARQ ACK的PDU的序列号中的最小序列号；
确定序列号在所述第一序列号和所述第三序列号之间的没有接收到HARQ ACK的至少一个PDU；
相应地，所述根据所述没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU，包括：
将序列号在所述第一序列号和所述第三序列号之间的至少一个没有接收到HARQ ACK的PDU确定为第一PDU，或者，将序列号在所述第一序列号和所述第三序列号之间的最小序列号对应的PDU确定为第一PDU。
在本发明实施例中，发送端可以将序列号在第一序列号和第三序列号之间的至少一个没有接收到HARQ ACK的PDU确定为第一PDU，或者将序列号在第一序列号和第三序列号之间的最小序列号对应的PDU确定为第一PDU，增加了发送端确定第一PDU的灵活性。
可选地，所述根据当前已发送的PDU，确定没有接收到HARQ ACK的至少一个PDU，包括：
确定第三序列号，所述第三序列号为当前不连续接收的PDU的序列号中的最小序列号；
确定序列号在所述第三序列号之前的没有接收到HARQ ACK的至少一个PDU；
相应地，所述根据所述没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU，包括：
将序列号在所述第三序列号之前的至少一个没有接收到HARQ ACK的PDU确定为第一PDU，或者，将所述第三序列号之前的最小序列号对应的PDU确定为第一PDU。
在本发明实施例中，发送端可以将序列号在第三序列号之前的至少一个没有接收到HARQ ACK的PDU确定为第一PDU，或者，将第三序列号之前的最小序列号对应的PDU确定为第一PDU，增加了发送端确定第一PDU的灵活性。
可选地，所述根据所述没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU，并向接收端重新发送所述第一PDU，包括：
当根据所述没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU后，立即执行向所述接收端重新发送所述第一PDU，或者当确定当前存在传输机会时,通过所述传输机会向所述接收端发送所述第一PDU。
在本发明实施例中，发送端确定第一PDU之后，立即执行向接收端重新发送第一PDU，以缩短重传第一PDU的时长。
可选地，所述根据所述至少一个PDU中没有接收到HARQ ACK的PDU，确定待重传的第一PDU之后，还包括：
确定所述第一PDU的个数，当所述第一PDU的个数大于或等于第一预设个数时，执行向所述接收端重新发送所述第一PDU；或者，
设置第一计时时间，并开始计时，当所述第一计时时间到达时重新执行根据所述没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU的步骤，若所述第一PDU的个数大于所述第一预设个数时，执行向所述接收端重新发送所述第一PDU。
在本发明实施例中，为了避免发送端频繁向接收端重传PDU，当发送端确定第一PDU之后，仅在第一PDU的个数大于或等于第一预设个数时，向接收端重新发送所述第一PDU；或者，在确定第一PDU之后，设置第一计时时间，当第一计时时间到达时，如果第一PDU的个数大于等于第一预设个数，向接收端重新发送所述第一PDU。
可选地，所述向所述接收端重新发送所述第一PDU，包括：
设置第二计时时间，并开始计时；
当所述第二计时时间到达时，判断所述第一PDU中是否存在还没有接收到HARQ ACK的PDU；
当所述第一PDU中存在还没有接收到HARQ ACK的PDU时，且所述还没有接收到HARQ ACK的PDU的个数大于或等于第二预设个数时，向所述接收端重新发送所述第一PDU中还没有接收到HARQ ACK的PDU。
在本发明实施例中，当发送端确定第一PDU之后，先不立即向接收端发送该第一PDU，而是设置计时时间，在计时时间到达之后，若该第一PDU中仍存在没有接收到HARQ ACK的PDU，且所述还没有接收到HARQ ACK的PDU的个数大于或等于第二预设个数时，向接收端重新发送所述第一PDU中还没有接收到HARQ ACK的PDU，减少了发送端向接收端重传PDU的次数，以此降低无线通信系统的负载。
可选地，所述向所述接收端重新发送所述第一PDU之后，还包括：
设置第三计时时间，并开始计时；
当所述第三计时时间到达时，判断所述第一PDU是否存在没有接收到HARQ ACK的PDU；
当所述第一PDU中仍存在没有接收到HARQ ACK的PDU时，向所述接收端重新发送所述仍没有接收到HARQ ACK的PDU。
在本发明实施例中，发送端向接收端重新发送第一PDU之后，为了保证该第一PDU都能被接收端接收到，可以设置第三计时时间，当第三计时时间到达时，若第一PDU中仍存在没有接收到HARQ ACK的PDU，发送端重新向接收端发送仍没有接收到HARQ ACK 的PDU。
第二方面，提供了一种数据重传方法，所述方法包括：
根据当前已接收到的协议数据单元PDU的序列号，确定需要发送端重传的第二PDU，所述当前已接收到的PUD为RLC PDU或者PDCP PDU；
向所述发送端发送针对所述第二PDU的状态报告，以使所述发送端在接收到所述第二PDU的状态报告，重新发送所述第二PDU。
需要说明的是，该数据重传方法用于接收端，该接收端用于接收发送端发送的PDU，在本发明实施例中，无需等待重排序计时器的计时时间到达，直接确定需要发送端重传的第二PDU，并向发送端送针对第二PDU的状态报告，以使发送端在接收到第二PDU的状态报告，重新发送第二PDU，缩短了接收端向发送端发送PDU状态报告的时间，从而提高了无线通信系统中数据传输的效率。
可选地，所述向所述发送端发送针对所述第二PDU的状态报告，以使所述发送端在接收到所述第二PDU的状态报告，重新发送所述第二PDU，包括：
立即执行向所述发送端发送针对所述第二PDU的状态报告，或者确定当前存在传输机会时，通过所述传输机会向所述发送端发送所述第二PDU的状态报告。
在本发明实施例中，当接收端确定第二PDU之后，立即向发送端发送针对第二PDU的状态报告，以减少发送端重传第二PDU的时长。
可选地，所述根据当前已接收到的协议数据单元PDU的序列号，确定需要发送端重传的第二PDU，包括：
将序列号在第四序列号和第五序列号之间且未接收到的至少一个PDU确定为所述第二PDU，所述第四序列号为当前连续接收到的PDU的最大序列号，所述第五序列号为当前已接收到的PDU的序列号中的最大序列号；或者，
将序列号在第四序列号和第六序列号之间的至少一个PDU确定为所述第二PDU，所述第六序列号为当前不连接接收到的PDU中序列号最小的PDU的序列号；或者，
将序列号在第五序列号之前的且未接收到的至少一个PDU确定为所述第二PDU；或者，
将序列号在第六序列号之前的且未接收到的至少一个PDU确定为所述第二PDU；或者，
将序列号为第七序列号及序列号在第七序列号之后的且未接收到的至少一个PDU确定为所述第二PDU，所述第七序列号为当前未正确接收的PDU中序列号最小的PDU的序列号，或者当前确定已经丢失的PDU中的序列号最小的PDU的序列号；或者，
将所述第四序列号和所述第六序列号之间的最小序列号对应的PDU确定为所述第二PDU。
在本发明实施例中，接收端可以根据第四序列号、第五序列号、第六序列号和第七序列号中的一个或多个确定第二PDU，增加了接收端确定第二PDU的灵活性。
可选地，所述根据当前已接收到的PDU的序列号，确定需要发送端重传的第二PDU之前，，还包括：
确定序列号在所述第四序列号和所述第五序列号之间且未接收到的PDU的个数；
当所述序列号在所述第四序列号和所述第五序列号之间且未接收到的PDU的个数大于或等于第三预设个数时，向所述发送端发送针对所述第二PDU的状态报告。
在本发明实施例中，为了降低接收端向发送端发送状态报告的频率，仅在序列号在第四序列号和第五序列号之间且未接收到的PDU的个数大于或等于第三预设个数时，确定需要发送端重传的第二PDU。
可选地，所述向所述发送端发送针对所述第二PDU的状态报告之后，还包括：
设置第四计时时间，并开始计时；
当所述第四计时时间到达时，判断是否全部接收到所述第二PDU；
当没有全部接收到所述第二PDU时，重新向所述发送端发送针对所述第二PDU中仍没有接收到的PDU的状态报告。
在本发明实施例中，在发送针对第二PDU的状态报告之后，设置第四计时时间，在第四计时时间到达时，若接收端没有全部接收到该第二PDU，重新向发送端发送针对第二PDU中仍没有接收到的PDU的状态报告，以确保接收端接收到第二PDU中的所有PDU。
第三方面，提供了一种数据重传装置，所述数据重传装置具有实现上述第一方面中数据重传方法行为的功能。该数据重传装置包括至少一个模块，该至少一个模块用于实现上述第一方面所提供的数据重传方法。
第四方面，提供了一种数据重传装置，所述数据重传装置具有实现上述第二方面中数据重传方法行为的功能。该数据重传装置包括至少一个模块，该至少一个模块用于实现上述第二方面所提供的数据重传方法。
第五方面，提供了一种数据重传装置，所述数据重传装置的结构中包括处理器和存储器，所述存储器用于存储支持数据重传装置执行上述第一方面或第二方面所提供的数据重传方法的程序，以及存储用于实现上述第一方面或第二方面所提供的数据重传方法所涉及的数据。所述处理器被配置为用于执行所述存储器中存储的程序。所述存储设备的操作装置还可以包括通信总线，该通信总线用于该处理器与存储器之间建立连接。
第六方面，本发明实施例提供了一种计算机存储介质，用于储存为上述第三方面和第四方面所提供的数据重传装置所用的计算机软件指令，或存储用于执行上述第三方面和第四方面为数据重传装置所设计的程序。
上述本发明实施例第三方面所获得的技术效果与第一方面中对应的技术手段获得的技术效果近似，在这里不再赘述。另外，上述本发明实施例第四方面所获得的技术效果与第二方面中对应的技术手段获得的技术效果近似，在这里同样不再赘述。
本发明实施例提供的技术方案的有益效果是：发送端确定待重传的第一PDU，并向接收端重新发送该第一PDU，无需等待接收端发送针对该第一PDU的状态报告，缩短了发送端重传第一PDU的时间，从而提高了无线通信系统中数据传输的效率。另外，接收端无需等待重排序计时器的计时时间到达，直接确定需要发送端重传的第二PDU，并向发送端送针对第二PDU的状态报告，以使发送端在接收到第二PDU的状态报告，重新发送第二PDU，缩短了接收端向发送端发送PDU状态报告的时间，同样提高了无线通信系统中数据传输的 效率。
附图说明
图1是本发明实施例提供的一种数据重传系统示意图；
图2是本发明实施例提供的一种网络设备的结构示意图；
图3A是本发明实施例提供的一种数据重传方法流程图；
图3B是本发明实施例提供的一种发送端维护的发送窗口示意图；
图4A是本发明实施例提供的另一种数据重传方法流程图；
图4B是本发明实施例提供的一种接收端维护的接收窗口示意图；
图5是本发明实施例提供的一种数据重传装置框图；
图6是本发明实施例提供的另一种数据重传装置框图。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明实施方式作进一步地详细描述。
图1是本发明实施例提供的一种数据重传系统示意图，如图1所示，该数据重传系统包括发送端101和接收端102，发送端101用于向接收端102发送PDU，接收端102用于接收发送端101发送的PDU，并针对未接收的PDU向发送端101发送状态报告，当发送端101接收到接收端102发送的针对PDU的状态报告时，向接收端102重传该PDU。其中，发送端和接收端之间可以通过无线或有线的方式进行通信，特别地，当发送端和接收端通过无线方式进行通信时，发送端和接收端可以基于长期演进(Long Term Evolutiong，LTE)网络进行无线通信，也可以基于其他网络如宽带码分多址(Wideband Code Division Multiple Access，WCDMA)网络进行无线通信。
需要说说明是，在本发明实施例中，发送端和接收端都为网络设备，当网络设备用于发送数据时，该网络设备为发送端，当网络设备用于接收数据时，该网络设备为接收端。例如，发送端可以为用户设备(User Equipment，UE)或基站等网络设备，接收端也可以为UE或基站等网络设备，本发明实施例在此不做详细限定，在一种可能的情况中，当发送端为UE时，接收端为基站；或者，当发送端为基站时，接收端为UE。
图2是本发明实施例提供的一种网络设备的结构示意图，该网络设备可以为图1所示的发送端101或接收端102。参见图2，该网络设备包括：发射机201、接收机202、存储器203、处理器204和通信总线205。
其中，发射机201可以用于发送数据和/或信令等。接收机202可以用于接收数据和/或信令等，当该网络设备通过发射机201发送数据时，该网络设备为发送端，当该网络设备通过接收机202接收设备时，该网络设备为接收端。另外，当该网络设备接入网络之后，发射机201和接收机202的控制平面都包括上层和下层，上层用于向下层下达指令并接收下层上报的信息，下层用于接收上层下达的指令并进行数据传输。其中，上层可以为无线资源控制(Radio Resource Control，RRC)层或PDCP层，下层可以为媒体访问控制(Medium  Access Control，MAC)层和物理层。当发送端的发射机接收来自上层的待发送的目标数据时，将目标数据整合得到PDU，然后通过下层将PDU发送给接收端的接收机。接收端的接收机通过下层接收到该PDU，将PDU整合后得到上述目标数据，并将该目标上报给上层，完成目标数据从发送端的发射机到接收端的接收机的发送过程。
其中，存储器203可以用于存储一个或多个软件程序和/或模块。存储器203可以是只读存储器(Read-only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、电可擦可编程只读存储器(Electrically Erasable Programmable Read-Only Memory，EEPROM)、只读光盘(Compact Disc Read-Only Memory，CD-ROM)、磁盘存储介质，或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由集成电路存取的任何其它介质，但不限于此。
其中，处理器204可以是一个通用中央处理器(Central Processing Unit，CPU)、微处理器、特定应用集成电路(Application-Specific Integrated Circuit，ASIC)，或一个或多个用于控制本发明方案程序执行的集成电路。处理器204可以通过运行存储在存储器203内的软件程序和/或模块，以及调用存储在存储器203内的数据，来实现下述图3A和图4A实施例所提供的数据重传方法。
其中，通信总线205可包括一通路，在上述组件之间传送信息。
图3A是本发明实施例提供的一种数据重传方法流程图，该数据重传方法用于发送端，该发送端用于向接收端发送PDU。如图3A所示，该数据重传方法包括以下几个步骤：
步骤301：根据当前已发送的PDU，确定没有接收到HARQ ACK的至少一个PDU，该已发送的PDU为RLC PDU或者PDCP PDU。
在本发明实施例中，当发送端通过下层将PDU发送给接收端后，为了使接收端可以快速向发送端反馈是否接收到该PDU，发送端可以基于前向纠错(Forward Error Correction，FEC)机制也即HARQ机制向接收端发送该PDU，也即，当发送端的下层接收到上层下发的PDU时，将该PDU进行整合得到传输块，并针对该传输块进行具有纠错能力的编码调制，然后通过基带信号产生射频信号，并向接收端发送该射频信号，值得注意的是，当发送端通过下层向接收端发送该射频信号之后，发送端的下层缓存有该传输块。当接收端通过下层接收到该射频信号时，对该射频信号进行解码处理，得到针对该传输块的HARQ ACK/HARQ非正确接收反馈(Non Acknowledgement，NACK)，并将该HARQ ACK/HARQ NACK发送给发送端，当发送端通过下层接收到HARQ NACK时，重传上述缓存的传输块，并记录重传次数。如果发送端在重传该传输块之后，仍通过下层接收到针对该传输块的HARQ NACK，继续重传该传输块，直至接收到针对该传输块的HARQ ACK或者重传次数达到预设次数，也即接收到针对该传输块对应的PDU的HARQ NACK的次数达到预设次数。当发送端通过下层接收到的针对该传输块对应的PDU的HARQ NACK的次数达到预设次数时，下层向上层上报该传输块传输失败消息，当发送端的上层接收到传输的传输失败消息时，根据存储的传输块和PDU的对应关系，确定该传输块对应的PDU，并向接收端重传该PDU。相应地，当发送端通过下层接收到HARQ ACK时，清理上述针对该传输块的缓存，并确定该传输块对应的PDU是否被接收端接收到，也即，发送端确定是否接收到该PDU对应的所有的传输块的HARQ ACK，当发送端接收到针对该PDU对应的所有的传输块的 HARQ ACK时，确定该PDU被接收端接收端到。因此，在本发明实施例中，发送端可以根据当前已发送的PDU和每个PDU对应的传输块是否接收到HARQ ACK，确定当前已发送的PDU中，没有接收到HARQ ACK的至少一个PDU。
其中，发送端的下层将该PDU进行整合得到传输块，并存储该PDU与该PDU整合之后的传输块之间的对应关系，需要说明的是，将该PDU进行整合之后，该PDU可能对应一个传输块，也可能对应多个传输块。当该PDU对应多个传输块时，当发送端的上层接收到针对其中一个传输块的传输失败消息时，确定该传输块对应的PDU传输失败，也即需要向接收端重传该PDU。另外，预设次数为预先设置的次数，该预设次数可以为3次、5次或7次等。
另外，在本发明实施例中，发送端发送的PDU可以为RLC层的PDU，也可以为PDCP层的PDU，本发明实施例不做具体限定。其中，发送端发送的PDU具体为哪一层的PDU取决于ARQ功能位于哪一层。例如，在现有的LTE网络中，ARQ功能位于RLC层，因此，在现有的LTE网络中，PDU为RLC层的PDU。
需要说明的是，发送端发送的每个PDU都有其对应的序列号，在发送端向接收端发送PDU之后，发送端将维护一个发送窗口，该发送窗口的下边界为当前时间之前连续接收到HARQ ACK的PDU中的最大序列号加1，标记为VT(A)，该发送窗口的上边界为下边界加上窗口大小，标记为VT(MS)，并将下一个待发送的PDU的序列号标记为VT(S)。其中，窗口大小为发送端预先设置的窗口大小，该窗口大小通常为512。值得注意的是，发送窗口的下边界总是维持在当前时间之前连续接收到HARQ ACK的PDU中的最大序列号加1，也即，在发送端维护的发送窗口中，包括当前不连续接收的PDU和未接收到HARQ ACK的PDU，因此，在本发明实施例中，发送端可以根据当前时间的发送窗口，确定没有接收到HARQ ACK的至少一个PDU，具体地，确定没有接收到HARQ ACK的至少一个PDU可以通过以下三种可能的方式实现。
第一种可能的方式，确定第一序列号和第二序列号，确定序列号在第一序列号和第二序列号之间的没有接收到HARQ ACK的至少一个PDU，其中，第一序列号为当前连续接收到的PDU的序列号中的最大序列号，第二序列号为当前下一个待发送的PDU的序列号。
在本发明实施例中，发送端可以直接确定第一序列号和第二序列号；也可以在发送端的上层接收到针对一个传输块的传输失败消息时，确定第一序列号和第二序列号，也即，当发送端的上层接收到针对一个传输块的传输失败消息时，发送端检测到针对第一目标PDU的HARQ NACK的次数达到预设次数，该第一目标PDU也即该传输块对应的PDU，此时，发送端需要针对当前时间之前已发送的PDU中没接收到HARQ ACK的PDU进行重传，为了确定当前时间之前已发送的PDU中没接收到HARQ ACK的PDU，发送端需要先确定第一序列号和第二序列号，也即，需要先确定当前时间之前连续接收到HARQ ACK的PDU的序列号中的最大序列号和当前时间下一个待发送的PDU的序列号。
在上述发送端维护的发送窗口中，对于处于发送窗口中的PDU，发送端存储有该发送窗口中的每个PDU对应的接收端接收情况，也即，对于处于发送窗口中的每个PDU，当发送端已经确定接收端接收到该PDU时，标记该PDU为已经确认接收的PDU，当发送端还没有确定该PUD被接收端接收时，标记该PDU为未被接收的PDU。因此，发送端在根据该发送窗口确定第一序列号和第二序列号之后，还可以根据该发送窗口中每个PDU的标记 情况，确定序列号位于第一序列号和第二序列号之间至少一个PDU中没有接收到HARQ ACK的至少一个PDU。
例如，图3B是本发明实施例提供的一种发送端维护的发送窗口示意图，如图3B所示，紧密左斜条纹填充的方块表示当前时间之前连续接收到HARQ ACK的PDU，其中，最右边的紧密左斜条纹填充的方块表示当前时间之前连续接收到HARQ ACK的PDU的序列号中的最大序列号对应的PDU，也即第一序列号对应的PUD；疏散左斜条纹填充的方块表示序列号大于第一序列号并且确定接收到HARQ ACK的PDU；白色填充的方块表示当前时间之前已经发送但是没有接收到HARQ ACK的PDU；黑点填充的方块表示当前时间即将发送的PDU，也即第二序列号对应的PDU，该PDU对应的序列号标记为VT(S)。另外，如图3B所示，将左边第一个白色填充的方块代表的PDU也即下一个即将接收到HARQ ACK的PDU对应的序列号标记为VT(A)。因此，根据图3B所示的发送窗口，发送端确定在第一序列号对应的PDU和第二序列号对应的PDU之间的白色填充的方块表示的PDU，也即确定至少一个PDU中没有接收到HARQ ACK的PDU。
第二种可能的方式，确定第一序列号和第三序列号，并确定序列号在第一序列号和第三序列号之间的没有接收到HARQ ACK的至少一个PDU，其中，第一序列号为当前连续接收到的PDU的序列号中的最大序列号，第三序列号为大于第一序列号且接收到HARQ ACK的PDU的序列号中的最小序列号。
如图3B所示，最右边的紧密左斜条纹填充的方块表示当前时间之前连续接收到HARQ ACK的PDU的序列号中的最大序列号对应的PDU，也即第一序列号对应的PUD，最左边疏散左斜条纹填充的方块表示序列号大于第一序列号并且确定接收到HARQ ACK的的序列号中的最小序列号，也即第三序列号对应的PDU，因此，根据当前的发送窗口，可以直接确定第一序列号和第三序列号。
第三种可能的方式，确定第三序列号，并确定序列号在第三序列号之前的没有接收到HARQ ACK的至少一个PDU，其中，第三序列号为当前不连续接收的PDU的序列号中的最小序列号。
在第三种可能的实现方式中，发送端可以根据当前的发送的窗口，直接确定第三序列号，并确定第三序列号之前的没有接收到HARQ ACK的至少一个PDU，增加了发送端确定确定没有接收到HARQ ACK的至少一个PDU的灵活性。其中，第三序列号为为当前不连续接收的PDU的序列号中的最小序列号，也即序列号大于第一序列号并且确定接收到HARQ ACK的的序列号中的最小序列号。
步骤302：根据没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU，并向接收端重新发送第一PDU。
在本发明实施例中，由于在步骤301中确定没有接收到HARQ ACK的至少一个PDU有三种可能的实现方式，因此相应地，根据没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU也有三种可能的方式。
第一种可能的实现的方式，将序列号在第一序列号和第二序列号之间的至少一个没有接收到HARQ ACK的PDU确定为第一PDU。由于序列号位于第一序列号和第二序列号之间至少一个PDU中可能存在多个没有接收到HARQ ACK的PDU，因此，根据该至少一个PDU中没有接收到HARQ ACK的PDU，确定待重传的第一PDU可以为：将至少一个PDU 中所有没有接收到HARQ ACK的PDU确定为待重传的第一PDU；或者，将至少一个PDU中没有接收到HARQ ACK的PDU中序列号最小的PDU确定为待重传的第一PDU；或者，当至少一个PDU中没有接收到HARQ ACK的PDU中存在至少两个连续的PDU，且至少两个连续的PDU包括至少一个PDU中没有接收到HARQ ACK的PDU中序列号最小的PDU时，将该至少两个连续的PDU确定为待重传的第一PDU。也即，发送端可以向接收端发送当前发送窗口中第一序列号和第二序列号之间的所有没有接收到HARQ ACK的PDU，也可以向接收端发送当前发送窗口中第一序列号和第二序列号之间的所有没有接收到HARQ ACK的PDU中的一个或多个PDU。
如图3B所示，将序列号在第一序列号和第二序列号之间的至少一个没有接收到HARQ ACK的PDU确定为第一PDU，也即将序列号在VT(S)和VT(A)之间且没有接收到HARQ ACK的PDU确定为第一PDU。在本发明实施例中，可以直接将序列号在VT(S)和VT(A)之间且没有接收到HARQ ACK的PDU确定为第一PDU，可以当VT(S)-VT(A)或大于等于第一预设值时，将序列号在VT(S)和VT(A)之间且没有接收到HARQ ACK的PDU确定为第一PDU，并重传第一PDU。或者，当VT(S)-VT(A)大于0时，即VT(S)-VT(A)之间存在至少一个已发送但没有接收到HARQ ACK的PDU时，启动定时器T1，并配置定时器T1的最长运行时间为K1，如果在定时器T1超时时，VT(S)-VT(A)大于或等于第二预设值时，将序列号在VT(S)和VT(A)之间且没有接收到HARQ ACK的PDU确定为第一PDU，并重传第一PDU，否则如果在定时器T1超时时，VT(S)-VT(A)小于第二预设值但大于零时，则重启定时器T1。
第二种可能的实现方式，将序列号在第一序列号和第三序列号之间的至少一个没有接收到HARQ ACK的PDU确定为第一PDU，或者，将序列号在第一序列号和第三序列号之间的最小序列号对应的PDU确定为第一PDU。
如图3B所示，发送端在确定第一序列号第三序列号之后，可以将第一序列号和第三序列号之间的没有接收到HARQ ACK的PDU确定为第一PDU。由于第一序列号和第三序列号之间的没有接收到HARQ ACK的PDU可能不止一个，因此发送端可以向接收端发送当前发送窗口中第一序列号和第三序列号之间的最小序列号对应的PDU，也可以向接收端发送当前发送窗口中第一序列号和第三序列号之间的所有PDU中的一个或多个PDU。
第三种可能的实现方式，将序列号在第三序列号之前的至少一个没有接收到HARQ ACK的PDU确定为第一PDU，或者，将第三序列号之前的最小序列号对应的PDU确定为第一PDU。
由于在发送端当前维护的发送窗口中，可以直接确定第三序列号，因此，在本发明实施例中，可以直接将将序列号在第三序列号之前的至少一个没有接收到HARQ ACK的PDU确定为第一PDU，或者，将第三序列号之前的最小序列号对应的PDU确定为第一PDU，无需通过第一序列号确定第一PDU。
在本发明实施例中，为了缩短发送端重传第一PDU的时长，当根据没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU后，立即执行向接收端重新发送第一PDU，或者当确定当前存在传输机会时,通过该传输机会向接收端发送第一PDU。其中，传输机会为系统在每隔预设时长为发送端分配的用于发送数据的资源，该预设时长通常为1s。
另外，为了避免发送端向接收端重传PDU次数过于频繁，导致无线通信系统负载过重， 当发送端确定第一PDU之后，可以采取以下两种策略。
第一种策略，发送端在确定待重传的第一PDU之后，可以不立即向接收端重新发送该第一PDU，而是在第一PDU的个数大于或等于第一预设个数时，再向接收端重新发送第一PDU。其中，第一预设个数可以为发送端预先设置的个数，该第一预设个数可以为2、3或5等。
具体地，发送端在第一PDU的个数大于或等于第一预设个数时，再向接收端重新发送第一PDU可以分为以下两种情况：
第一种情况，当发送端确定第一PDU时，确定第一PDU的个数，当第一PDU的个数大于或等于第一预设个数时，执行向接收端重新发送第一PDU的步骤。
例如，第一预设个数为3，当将至少一个PDU中所有没有接收到HARQ ACK的PDU确定为待重传的第一PDU时，确定该第一PDU的个数，如果该第一PDU的个数小于3，发送端将不向接收端重新发送该第一PDU，如果该第一PDU个数大于或等于3，发送端向接收端重新发送该第一PDU。
第二种情况，设置第一计时时间，并开始计时，当第一计时时间到达时，重新执行根据没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU的步骤，若第一PDU的个数大于或等于第一预设个数时，执行向接收端重新发送第一PDU的步骤。
需要说明的是，对于发送端维护的发送窗口，该发送窗口的下边界总保持为当前时间之前连续接收到HARQ ACK的PDU中的最大序列号加1，因此，如果发送端在第一计时时间内接收到一个PDU的HARQ ACK，发送端将根据该PDU的序列号，对当前时间的发送窗口进行更新，也即当第一计时时间到达时，发送端需要重新执行根据没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU的步骤。相应地，若第一PDU的个数小于第一预设个数时，重新执行设置第一计时时间并开始计时的操作。
其中，第一计时时间为发送端预先设置的时间，该第一计时时间可以为1ms或2ms等。发送端设置第一计时时间，并开始计时可以通过启动定时器实现，
例如，第一计时时间为1ms，第一预设个数为3，发送端在将至少一个PDU中所有没有接收到HARQ ACK的PDU确定为待重传的第一PDU时，启动第一定时器，该第一定时器的计时时间为1ms，当1ms的计时时间到达时，如果第一PDU的个数大于或等于3，向接收端重新发送第一PDU。相应地，如果1ms的定时时间到达时，该第一PDU的个数小于3时，重新启动第一定时器，并开始计时，循环执行以上步骤。
第二种策略，当发送端确定第一PDU时，先不立即向接收端重新发送第一PDU，而是延迟发送第一PDU，也即，发送端在确定第一PDU之后，设置第二计时时间，并开始计时；当第二计时时间到达时，判断第一PDU中是否存在还没有接收到HARQ ACK的PDU；当第一PDU中存在还没有接收到HARQ ACK的PDU，且还没有接收到HARQ ACK的PDU的个数大于或等于第二预设个数时，向接收端重新发送第一PDU中还没有接收到HARQ ACK的PDU；如果第二计时时间达到之前，发送端接收到该第一PDU中所有PDU的ACK时，将不执行任何操作；或者在第二计时时间到达时，还没有接收到HARQ ACK的PDU的个数小于第二预设个数时，将不执行任何操作。
其中，第二计时时间为发送端中预先设置的计时时间，值得注意的是，为了避免发送端在确定第一PDU之后，等待较长时间，该第二时间时间不宜过长，通常小于1ms。由于 低延迟计时器的计时时间通常较短，因此，发送端设置该第二计时时间，并开始计时可以通过启动低延迟定时器来实现。
需要说明的是，在本发明实施例中，发送端可以分别使用第一种策略或第二种策略来避免发送端向接收端重传PDU次数过于频繁，也可以同时使用第一种策略和第二种策略来避免发送端向接收端重传PDU次数过于频繁。
例如，当前最小的已经收到HARQ ACK的PDU也即第三序列号对应的PDU之前存在N(N为预设值)个已发送但未接收到HARQ ACK的PDU时，发送端将该N个已发送但未接收到HARQ ACK的PDU确定为第一PDU，也即发送方确定对该N个已发送但未接收到HARQ ACK的PDU执行重传。具体地，可以是立即执行重传，或者也可以设置一个低延迟定时器来确定重传时刻，即低延迟定时器超时后如果该N个已发送但未接收到HARQ ACK的PDU中至少一个还没有成功发送，也即该N个已发送但未接收到HARQ ACK的PDU中还存在未接收到HARQ ACK的PDU，发送端则重传该未接收到HARQ ACK的PDU。
可选地，在本发明实施例中，还可以根据第三序列号之后的PDU是否接收到HARQ ACK来确定第一PDU。例如，如果当前最小的还没有确定已经正确发送的PDU也即VT(A)对应的PDU之后存在一个或X个(X为预设值)已经接收到HARQ ACK的PDU时，发送方确定将当前最小的还没有接收到HARQ ACK的PDU也即序列为VT(A)的PDU执行重传。或者，将当前最小的还没有接收到HARQ ACK的PDU也即VT(A)对应的PDU和当前已经收到HARQ ACK的最大PDU(也即VT(S)-1的序列号对应的PDU)之间的未接收到HARQ ACK的PDU执行重传。
另外，在本发明实施例中，当发送端向接收端重新发送第一PDU时，发送端可以选择与上次PDU传输相同的链路进行传输。当然，如果当前存在多条链路可以进行数据传输时，且上次PDU传输的链路状态不太稳定时，发送端还可以选择与上次PDU传输不同的链路进行传输。
进一步地，在本发明实施例中，为了保证接收端全部接收到该第一PDU，发送端向接收端重新发送第一PDU之后，设置第三计时时间，并开始计时；当第三计时时间到达时，判断第一PDU是否存在没有接收到HARQ ACK的PDU；当第一PDU中仍存在没有接收到HARQ ACK的PDU时，向接收端重新发送仍没有接收到HARQ ACK的PDU。
其中，第三计时时间为发送端中预先设置的计时时间，该第三计时时间可以为2ms或3ms等。
在本发明实施例中，发送端确定待重传的第一PDU，并向接收端重新发送该第一PDU，无需等待接收端发送针对该第一PDU的状态报告，缩短了发送端重传第一PDU的时间，从而提高了无线通信系统中数据传输的效率。
图4A是本发明实施例提供的另一种数据重传方法流程图，该数据重传方法用于接收端，该接收端用于接收发送端发送的PDU，如图4A所示，该数据重传方法包括以下几个步骤：
步骤401：根据当前已接收到的PDU的序列号，确定需要发送端重传的第二PDU，当前已接收到的PUD为RLC PDU或者PDCP PDU。
根据上一个实施例中针对发送端基于FEC机制也即HARQ机制向接收端发送该PDU 的说明，当接收端通过下层接收到发送端发送的射频信号时，对该射频信号进行解码处理，得到该射频信号对应的传输块，并确定针对该传输块的HARQ ACK HARQ/NACK，当确定针对该传输块的HARQ ACK时，对接收到的传输块进行处理，得到该传输块对应的PDU，并向上层发送该PDU，也即接收端确定接收到该PDU。在本发明实施例中，当接收端接收到发送端发送的PDU时，根据已经接收到的PDU的序列号，接收端将维护一个接收窗口，该接收窗口的下边界为当前时间之前连续接收到的PDU的最大序列号加1，标记为VR(R)，该接收窗口的上边界为下边界加上窗口大小，标记为VR(H)，当接收端接收到当前时间之前连续接收到的PDU的最大序列号加1的序列号对应的PDU时，更新该发送窗口，也即更新VR(R)和VR(H)。其中，窗口大小为接收端预先设置的窗口大小，该接收端的接收窗口的大小和发送端的发送窗口的大小一致，通常为512。
值得注意的是，当接收端确定接收到某个PDU之前的所有PDU时，也即当接收端确定当前时间之前连续接收到的PDU时，接收端通过当前PDU所处的层将该连续接收到的PDU上交给上层。因此，在接收端维护的接收窗口中，该接收窗口的下边界总是维持为当前时间之前连续接收到的PDU的最大序列号加1，也即接收端维护的接收窗口中包括未正确接收的PUD。因此，在本发明实施例中，接收端可以根据当前维护的接收窗口确定需要发送端重传的第二PDU，也即接收端根据当前维护的接收窗口确定当前时间未正确接收的PDU。例如，图4B是本发明实施例提供的一种接收端维护的接收窗口示意图，如图4B所示，横条纹填充的方块表示当前时间之前连续接收到的PDU，其中，最右边一个横条纹填充的方块表示当前时间之前连续接收到的PDU的最大序列号对应的PDU，也即第四序列号对应的PDU；斜方格填充的方块表示当前时间之前已接收到的且序列号大于第四序列号的PDU，其中，最后边的用斜方格填充的方块表示当前时间之前已接收到的PDU中序列号最大的PDU，也即第五序列号对应的PDU，最左边的用斜方格填充的方块表示当前时间之前已接收到的PDU的序号中大于第四序列号且最小的序列号对应的PDU，也即第六序列号对应的PUD，将第六序列号也可以标记为标记为VR(L)；右斜条纹填充的方块表示当前时间即将接收的PDU，标记为VR(H)；白色填充的方块表示序列号小于当前时间即将接收的PDU的序列号但是未被接收端接收到的PDU，其中最左边白色填充的方块标记为第七序列号对应的PDU，也可以标记为标记为VR(MS)。
由于可能存在多个在当前时间之前未正确接收的PDU，因此接收端确定需要发送端重传的第二PDU，可以分为以下几种情况。
第一种情况，将序列号在第四序列号和第五序列号之间且未接收到的至少一个PDU确定为第二PDU，第四序列号为当前连续接收到的PDU的最大序列号，第五序列号为当前已接收到的PDU的序列号中的最大序列号。
由于，在本发明实施例中，当接收端确定当前时间之前连续接收到的PDU时，接收端通过当前PDU所处的层将该连续接收到的PDU上交给上层，因此，第四序列号也可以为当前向上层递交的PDU序列号中最大序列号。
如图4B所示，如果当前最后一个连续按序向上层递交的PDU(即第四序列号对应的PUD或序列号为VR(R)-1的PDU)与当前正确接收的PDU中序列号最大的PDU(即第五序列号对应的PDU或序列号为VR(H)-1的PDU)之间存在至少一个没有正确接收的PDU时，接收端向发送端反馈VR(R)-1与VR(H)-1之间的未正确接收到的PDU的序 列号。
第二种情况，将序列号在第四序列号和第六序列号之间的至少一个PDU确定为第二PDU，第六序列号为当前不连接接收到的PDU中序列号最小的PDU的序列号。
如图4B所示，如果当前最后一个连续按序向高层递交的PDU(即第四序列号对应的PDU或序列号为VR(R)-1的PDU)与当前存储的最早正确收到的PDU(也即第六序列号对应的PDU或序列号为VR(L)的PDU)之间存在至少一个未正确接收的PDU时，则触发对序列号在VR(R)-1和VR(L)之间的未正确接收的PDU进行状态报告反馈，也即接收端向发送端发送针对序列号在VR(R)-1和VR(L)之间的未正确接收的PDU的状态报告。具体地，接收端可以发送序列号在VR(R)-1和VR(L)之间且第一个未正确接收的PDU的序列号和序列号在VR(R)-1和VR(L)之间的PDU的个数，或者发送序列号序列号在VR(R)-1和VR(L)之间的各个未正确接收到的PDU的序列号。
第三种情况，将序列号在第五序列号之前的且未接收到的至少一个PDU确定为第二PDU。
如图4B所示，如果当前正确接收的PDU中序列号最大的PDU(即第五序列号对应的PDU或序列号为VR(H)-1的PDU)之前存在至少一个未正确接收的PDU时，接收端向发送端反馈序列号在VR(H)-1之前的未正确接收到的PDU的序列号，以使发送端重传序列号在VR(H)-1之前的至少一个未正确接收到的PDU。
第四种情况，将序列号在第六序列号之前的且未接收到的至少一个PDU确定为第二PDU。
如图4B所示，如果当前存储的最早正确收到的PDU(也即第六序列号对应的PDU或序列号为VR(L)的PDU)之前存在至少一个未正确接收的PDU时，接收端向发送端反馈序列号在VR(L)之前的未正确接收到的PDU的序列号。
第五种情况，将序列号为第七序列号及序列号在第七序列号之后的且未接收到的至少一个PDU确定为第二PDU，第七序列号为当前未正确接收的PDU中序列号最小的PDU的序列号，或者当前确定已经丢失的PDU中的序列号最小的PDU的序列号。
如图4B所示，如果第一个未正确接收的PDU(也即第七序列号对应的PUD或序列号为VR(MS)的PDU)之后存在Y(Y为预设值)个未正确接收的PDU时，向发送端反馈第一个未正确接收的PDU的序列号，或向发送端反馈第一个未正确接收的PDU及之后的Y个未正确接收的PDU的序列号。
在本发明实施例中，接收端可以使用重排序计时器来进行重排序操作，也可以不使用使用重排序计时器来进行重排序操作。当接收端使用重排序计时器来进行重排序操作时，当重排序计时器的计时时间达到时，如果接收端还没有接收到触发重排序计时器启动的未正确接收的PDU，接收端将确定该未正确接收的PDU为丢失的PDU，因此，第七序列号也可以为当前确定已经丢失的PDU中的序列号最小的PDU的序列号。当第七序列号为当前确定已经丢失的PDU中的序列号最小的PDU的序列号时，将第七序列号标记为VR(R)。
当接收端使用重排序计时器来进行重排序操作时，如果第一个确定已经丢失的PDU(即序列号为VR(R)的PDU)之后，存在M(M为预设值)个未正确接收的PDU时，向发送端反馈第一个确定已经丢失的PDU的序列号，或向发送端反馈第一个确定已经丢失的PDU以及之后的M个未正确接收的PDU的序列号给发送端。其中，M个未正确接收的PDU 包括已经确定为丢失的PDU。
第六种情况，将第四序列号和第六序列号之间的最小序列号对应的PDU确定为第二PDU。
在上述六种情况中，第四序列、第五序列、第六序列和第七序列号为接收端当前维护的接收窗口中的序列号，也即，在本发明实施例中，接收端可以根据第四序列、第五序列、第六序列和第七序列中的一个或多个确定第二PDU。
另外，在本发明实施例中，接收端接收的PDU可以为RLC层的PDU，也可以为PDCP层的PDU，本发明实施例不做具体限定。其中，接收端接收的PDU具体为哪一层的PDU取决于ARQ功能位于哪一层。例如，在现有的LTE网络中，ARQ功能位于RLC层，因此，在现有的LTE网络中，PDU为RLC层的PDU。
需要说明的是，在本发明实施例中，可以直接确定第二PDU，也可以在第四序列号和第六序列号不连续时，确定第二PDU。也即，当第四序列号和第六序列号不连续时，表明当前时间存在发送端已经发送但是接收端没有接收到的PDU，此时，接收端可以针对当前时间之前未正确接收的PDU发送状态报告。
步骤402：向发送端发送针对第二PDU的状态报告，以使发送端在接收到第二PDU的状态报告，重新发送第二PDU。
在本发明实施例中，当接收端确定第二PDU之后，为了减少发送端重传第二PDU的时长，接收端可以在确定第二PDU时，立即执行向发送端发送针对第二PDU的状态报告，或者确定当前存在传输机会时，通过传输机会向发送端发送第二PDU的状态报告，其中传输机会为系统在每隔预设时长为接收端分配的用于发送数据的资源，该预设时长通常为1s。
可选地，在本发明实施例中，为了避免接收端向发送端发送的状态报告次数过多，在接收端确定需要发送端重传的第二PDU之前，接收端还可以确定序列号在第四序列号和第五序列号之间且未接收到的PDU的个数；当序列号在第四序列号和第五序列号之间且未接收到的PDU的个数大于或等于第三预设个数时，执行根据第三序列号和第四序列号，确定需要发送端重传的第二PDU，并向发送端发送针对第二PDU的状态报告。也即，接收端并不立即确定该第二PDU，而是在确定序列号在第四序列号和第五序列号之间且未接收到的PDU的个数大于第二预设个数时，确定第二PDU，并向发送端发送针对第二PDU的状态报告。
其中，第三预设个数为接收端中预先设置的个数，该第三预设个数可以为2、3或5等。
例如，接收端确定确定序列号在第四序列号和第五序列号之间且未接收到的PDU的个数，也即确定当前时间之前未正确接收的PDU的个数，当该当前时间之前未正确接收的PDU的个数大于3时，发送端可以根据步骤401中确定需要发送端重传的第二PDU的六种情况确定第二PDU，并向发送端发送针对第二PDU的状态报告。相应地，当该当前时间之前未正确接收的PDU的个数小于或等于3时，无需执行任何操作。
进一步，在本发明实施例中，为了确保接收端可以接收到该第二PDU中的所有PDU，在接收端向发送端发送针对第二PDU的状态报告之后，接收端还可以设置第四计时时间，并开始计时；当第四计时时间到达时，判断是否全部接收到第二PDU；当没有全部接收到第二PDU时，重新向发送端发送针对第二PDU中仍没有接收到的PDU的状态报告。
其中，第四计时时间为接收端预先设置的时间，该第四计时时间可以为1ms、2ms或 3ms等。
例如，接收端在向发送端发送针对第二PDU的状态报告之后，启动定时器T2，在定时器T2的定时时间到达之前，不再重复向发送端发送针对该第二PDU的状态报告，如果在该定时器T2的定时时间到达之前，接收端已确定正确收到该第二PDU中的所有PDU，则终止该定时器T2。如果在定时器T2的定时时间到达时，该第二PDU中仍然有至少一个PDU未正确接收，则根据最新接收状态，重新向发送端发送状态报告，也即向发送端发送针对第二PDU中仍未正确接收的PDU的状态报告。
在本发明实施例中，当接收端检测到第三序列号和第四序列号不连续时，无需等待重排序计时器的计时时间到达，直接确定需要发送端重传的第二PDU，并向发送端送针对第二PDU的状态报告，以使发送端在接收到第二PDU的状态报告，重新发送第二PDU，缩短了接收端向发送端发送PDU状态报告的时间，同样提高了无线通信系统中数据传输的效率。
图5是本发明实施例提供的一种数据重传装置500，该数据重传装置可以由软件、硬件或者两者的结合实现成为网络设备的部分或者全部，该网络设备可以为图2所示的网络设备。参见图5，该装置包括第一确定模块501和第二确定模块502。
第一确定模块501，用于执行图3A实施例中的步骤301；
第二确定模块502，用于执行图3A实施例中的步骤302。
可选地，第一确定模块501包括第一确定单元和第二确定单元：
第一确定单元，用于确定第一序列号和第二序列号，第一序列号为当前连续接收到的PDU的序列号中的最大序列号，第二序列号为当前下一个待发送的PDU的序列号；
第二确定单元，用于确定序列号在第一序列号和第二序列号之间的没有接收到HARQ ACK的至少一个PDU；
相应地，第二确定模块502包括第三确定单元：
第三确定单元，用于将序列号在第一序列号和第二序列号之间的至少一个没有接收到HARQ ACK的PDU确定为第一PDU。
可选地，第一确定模块501包括第四确定单元和第五确定单元：
第四确定单元，用于确定第一序列号和第三序列号，第一序列号为当前连续接收到的PDU的序列号中的最大序列号，第三序列号为大于第一序列号且接收到HARQ ACK的PDU的序列号中的最小序列号；
第五确定单元，用于确定序列号在第一序列号和第三序列号之间的没有接收到HARQ ACK的至少一个PDU；
相应地，第二确定模块包括第六确定单元：
第六确定单元，用于将序列号在第一序列号和第三序列号之间的至少一个没有接收到HARQ ACK的PDU确定为第一PDU，或者，将序列号在第一序列号和第三序列号之间的最小序列号对应的PDU确定为第一PDU。
可选地，第一确定模块包括第七确定单元和第八确定单元：
第七确定单元，用于确定第三序列号，第三序列号为当前不连续接收的PDU的序列号中的最小序列号；
第八确定单元，用于确定序列号在第三序列号之前的没有接收到HARQ ACK的至少一个PDU；
相应地，第二确定模块包括第九确定单元：
第九确定单元，用于将序列号在第三序列号之前的至少一个没有接收到HARQ ACK的PDU确定为第一PDU，或者，将第三序列号之前的最小序列号对应的PDU确定为第一PDU。
可选地，第二确定模块包括执行单元：
执行单元，用于当根据没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU后，立即执行向接收端重新发送第一PDU，或者当确定当前存在传输机会时,通过该传输机会向接收端发送第一PDU。
可选地，该装置500还包括第三确定模块和第一计时模块：
第三确定模块，用于确定第一PDU的个数，当第一PDU的个数大于或等于第一预设个数时，执行向接收端重新发送第一目标PDU；或者，
第一计时模块，用于设置第一计时时间，并开始计时，当第一计时时间到达时，重新执行根据没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU，若第一PDU的个数大于第一预设个数时，执行向接收端重新发送第一PDU。
可选地，第二确定模块502包括计时单元、判断单元和发送单元：
计时单元，用于设置第二计时时间，并开始计时；
判断单元，用于当第二计时时间到达时，判断第一PDU中是否存在还没有接收到HARQ ACK的PDU；
发送单元，用于当第一PDU中存在还没有接收到HARQ ACK的PDU时，且还没有接收到HARQ ACK的PDU的个数大于或等于第二预设个数时，向接收端重新发送第一PDU中还没有接收到HARQ ACK的PDU。
可选地，装置500还包括第二计时模块、判断模块和发送模块：
第二计时模块，用于设置第三计时时间，并开始计时；
判断模块，用于当第三计时时间到达时，判断第一PDU是否存在没有接收到HARQ ACK的PDU；
发送模块，用于当第一PDU中仍存在没有接收到HARQ ACK的PDU时，向接收端重新发送该仍没有接收到HARQ ACK的PDU。
在本发明实施例中，确定待重传的第一PDU，并向接收端重新发送该第一PDU，无需等待接收端发送针对该第一PDU的状态报告，缩短了发送端重传第一PDU的时间，从而提高了无线通信系统中数据传输的效率。
需要说明的是：上述实施例提供的数据重传装置在数据重传时，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将装置的内部结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。另外，上述实施例提供的数据重传装置与图3A实施例提供的数据重传方法属于同一构思，其具体实现过程详见图3A实施例，这里不再赘述。
图6是本发明实施例提供的一种数据重传装置600，该数据重传装置可以由软件、硬件或者两者的结合实现成为网络设备的部分或者全部，该网络设备可以为图2所示的网络设 备。参见图6，该装置包括第一确定模块601和发送模块602。
第一确定模块601，用于执行图4A实施例中的步骤401；
发送模块602，用于执行图4A实施例中的步骤402。
可选地，该发送模块602包括执行单元：
执行单元，用于立即执行向发送端发送针对第二PDU的状态报告，或者确定当前存在传输机会时，通过该传输机会向发送端发送第二PDU的状态报告。
可选地，该第一确定模块601包括：
第一确定单元，用于将序列号在第四序列号和第五序列号之间且未接收到的至少一个PDU确定为第二PDU，第四序列号为当前连续接收到的PDU的最大序列号，第五序列号为当前已接收到的PDU的序列号中的最大序列号；或者，
第二确定单元，用于将序列号在第四序列号和第六序列号之间的至少一个PDU确定为第二PDU，第六序列号为当前不连接接收到的PDU中序列号最小的PDU的序列号；或者，
第三确定单元，用于将序列号在第五序列号之前的且未接收到的至少一个PDU确定为第二PDU；或者，
第四确定单元，用于将序列号在第六序列号之前的且未接收到的至少一个PDU确定为第二PDU；或者，
第五确定单元，用于将序列号为第七序列号及序列号在第七序列号之后的且未接收到的至少一个PDU确定为第二PDU，第七序列号为当前未正确接收的PDU中序列号最小的PDU的序列号，或者当前确定已经丢失的PDU中的序列号最小的PDU的序列号；或者，
第六确定单元，用于将第四序列号和第六序列号之间的最小序列号对应的PDU确定为第二PDU。
可选地，该装置600还包括第二确定模块和执行模块：
第二确定模块，用于确定序列号在第四序列号和第五序列号之间且未接收到的PDU的个数；
执行模块，用于当序列号在第四序列号和第五序列号之间且未接收到的PDU的个数大于或等于第三预设个数时，向发送端发送针对第二PDU的状态报告。
可选地，装置600还包括计时模块、判断模块和第二发送模块：
计时模块，用于设置第四计时时间，并开始计时；
判断模块，用于当第四计时时间到达时，判断是否全部接收到第二PDU；
第二发送模块，用于当没有全部接收到第二PDU时，重新向发送端发送针对该第二PDU中仍没有接收到的PDU的状态报告。
在本发明实施例中，接收端无需等待重排序计时器的计时时间到达，直接确定需要发送端重传的第二PDU，并向发送端送针对第二PDU的状态报告，以使发送端在接收到第二PDU的状态报告，重新发送第二PDU，缩短了接收端向发送端发送PDU状态报告的时间，同样提高了无线通信系统中数据传输的效率。
需要说明的是：上述实施例提供的数据重传装置在数据重传时，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将装置的内部结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。另外，上述实施例提供的数据重传装置与图4A实施例提供的数据重传方法属于同一构思， 其具体实现过程详见图4A实施例，这里不再赘述。
本领域普通技术人员可以理解实现上述实施例的全部或部分步骤可以通过硬件来完成，也可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，上述提到的存储介质可以是只读存储器，磁盘或光盘等。
以上所述仅为本发明的较佳实施例，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (26)

  1. 一种数据重传方法，其特征在于，所述方法包括：
    根据当前已发送的协议数据单元PDU，确定没有接收到混合自动重传正确接收确认HARQ ACK的至少一个PDU，所述已发送的PDU为无线链路控制RLC PDU或者分组数据汇聚协议PDCP PDU；
    根据所述没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU，并向接收端重新发送所述第一PDU。
  2. 如权利要求1所述的方法，其特征在于，所述根据当前已发送的PDU，确定没有接收到HARQ ACK的至少一个PDU，包括：
    确定第一序列号和第二序列号，所述第一序列号为当前连续接收到的PDU的序列号中的最大序列号，所述第二序列号为当前下一个待发送的PDU的序列号；
    确定序列号在所述第一序列号和所述第二序列号之间的没有接收到HARQ ACK的至少一个PDU；
    相应地，所述根据所述没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU，包括：
    将序列号在所述第一序列号和所述第二序列号之间的至少一个没有接收到HARQ ACK的PDU确定为第一PDU。
  3. 如权利要求1所述的方法，其特征在于，所述根据当前已发送的PDU，确定没有接收到HARQ ACK的至少一个PDU，包括：
    确定第一序列号和第三序列号，所述第一序列号为当前连续接收到的PDU的序列号中的最大序列号，所述第三序列号为大于所述第一序列号且接收到HARQ ACK的PDU的序列号中的最小序列号；
    确定序列号在所述第一序列号和所述第三序列号之间的没有接收到HARQ ACK的至少一个PDU；
    相应地，所述根据所述没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU，包括：
    将序列号在所述第一序列号和所述第三序列号之间的至少一个没有接收到HARQ ACK的PDU确定为第一PDU，或者，将序列号在所述第一序列号和所述第三序列号之间的最小序列号对应的PDU确定为第一PDU。
  4. 如权利要求1所述的方法，其特征在于，所述根据当前已发送的PDU，确定没有接收到HARQ ACK的至少一个PDU，包括：
    确定第三序列号，所述第三序列号为当前不连续接收的PDU的序列号中的最小序列号；
    确定序列号在所述第三序列号之前的没有接收到HARQ ACK的至少一个PDU；
    相应地，所述根据所述没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU，包括：
    将序列号在所述第三序列号之前的至少一个没有接收到HARQ ACK的PDU确定为第一PDU，或者，将所述第三序列号之前的最小序列号对应的PDU确定为第一PDU。
  5. 如权利要求1所述的方法，其特征在于，所述根据所述没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU，并向接收端重新发送所述第一PDU，包括：
    当根据所述没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU后，立即执行向所述接收端重新发送所述第一PDU，或者当确定当前存在传输机会时,通过所述传输机会向所述接收端发送所述第一PDU。
  6. 如权利要求1所述的方法，其特征在于，所述根据所述至少一个PDU中没有接收到HARQ ACK的PDU，确定待重传的第一PDU之后，还包括：
    确定所述第一PDU的个数，当所述第一PDU的个数大于或等于第一预设个数时，执行向所述接收端重新发送所述第一PDU；或者，
    设置第一计时时间，并开始计时，当所述第一计时时间到达时，重新执行根据所述没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU的步骤，若所述第一PDU的个数大于或等于所述第一预设个数，执行向所述接收端重新发送所述第一PDU。
  7. 如权利要求1至6任一所述的方法，其特征在于，所述向所述接收端重新发送所述第一PDU，包括：
    设置第二计时时间，并开始计时；
    当所述第二计时时间到达时，判断所述第一PDU中是否存在还没有接收到HARQ ACK的PDU；
    当所述第一PDU中存在还没有接收到HARQ ACK的PDU，且所述还没有接收到HARQ ACK的PDU的个数大于或等于第二预设个数时，向所述接收端重新发送所述第一PDU中还没有接收到HARQ ACK的PDU。
  8. 如权利要求1至7任一所述的方法，其特征在于，所述向所述接收端重新发送所述第一PDU之后，还包括：
    设置第三计时时间，并开始计时；
    当所述第三计时时间到达时，判断所述第一PDU是否存在没有接收到HARQ ACK的PDU；
    当所述第一PDU中仍存在没有接收到HARQ ACK的PDU时，向所述接收端重新发送所述仍没有接收到HARQ ACK的PDU。
  9. 一种数据重传方法，其特征在于，所述方法包括：
    根据当前已接收到的协议数据单元PDU的序列号，确定需要发送端重传的第二PDU，所述当前已接收到的PUD为无线链路控制RLC PDU或者分组数据汇聚协议PDCP PDU；
    向所述发送端发送针对所述第二PDU的状态报告，以使所述发送端在接收到所述第二PDU的状态报告，重新发送所述第二PDU。
  10. 根据权利要求9所述的方法，其特征在于，所述向所述发送端发送针对所述第二PDU的状态报告，以使所述发送端在接收到所述第二PDU的状态报告，重新发送所述第二PDU，包括：
    立即执行向所述发送端发送针对所述第二PDU的状态报告，或者确定当前存在传输机会时，通过所述传输机会向所述发送端发送所述第二PDU的状态报告。
  11. 如权利要求9所述的方法，其特征在于，所述根据当前已接收到的协议数据单元PDU的序列号，确定需要发送端重传的第二PDU，包括：
    将序列号在第四序列号和第五序列号之间且未接收到的至少一个PDU确定为所述第二PDU，所述第四序列号为当前连续接收到的PDU的最大序列号，所述第五序列号为当前已接收到的PDU的序列号中的最大序列号；或者，
    将序列号在第四序列号和第六序列号之间的至少一个PDU确定为所述第二PDU，所述第六序列号为当前不连接接收到的PDU中序列号最小的PDU的序列号；或者，
    将序列号在第五序列号之前的且未接收到的至少一个PDU确定为所述第二PDU；或者，
    将序列号在第六序列号之前的且未接收到的至少一个PDU确定为所述第二PDU；或者，
    将序列号为第七序列号及序列号在第七序列号之后的且未接收到的至少一个PDU确定为所述第二PDU，所述第七序列号为当前未正确接收的PDU中序列号最小的PDU的序列号，或者当前确定已经丢失的PDU中的序列号最小的PDU的序列号；或者，
    将所述第四序列号和所述第六序列号之间的最小序列号对应的PDU确定为所述第二PDU。
  12. 如权利要求9所述的方法，其特征在于，所述根据当前已接收到的PDU的序列号，确定需要发送端重传的第二PDU之前，还包括：
    确定序列号在所述第四序列号和所述第五序列号之间且未接收到的PDU的个数；
    当所述序列号在所述第四序列号和所述第五序列号之间且未接收到的PDU的个数大于或等于第三预设个数时，向所述发送端发送针对所述第二PDU的状态报告。
  13. 如权利要求9至12任一所述的方法，其特征在于，所述向所述发送端发送针对所述第二PDU的状态报告之后，还包括：
    设置第四计时时间，并开始计时；
    当所述第四计时时间到达时，判断是否全部接收到所述第二PDU；
    当没有全部接收到所述第二PDU时，重新向所述发送端发送针对所述第二PDU中仍没有接收到的PDU的状态报告。
  14. 一种数据重传装置，其特征在于，所述装置包括：
    第一确定模块，用于根据当前已发送的协议数据单元PDU，确定没有接收到混合自动重传正确接收确认HARQ ACK的至少一个PDU，所述已发送的PDU为无线链路控制RLC PDU或者分组数据汇聚协议PDCP PDU；
    第二确定模块，用于根据所述没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU，并向接收端重新发送所述第一PDU。
  15. 如权利要求14所述的装置，其特征在于，所述第一确定模块包括：
    第一确定单元，用于确定第一序列号和第二序列号，所述第一序列号为当前连续接收到的PDU的序列号中的最大序列号，所述第二序列号为当前下一个待发送的PDU的序列号；
    第二确定单元，用于确定序列号在所述第一序列号和所述第二序列号之间的没有接收到HARQ ACK的至少一个PDU；
    相应地，所述第二确定模块包括：
    第三确定单元，用于将序列号在所述第一序列号和所述第二序列号之间的至少一个没有接收到HARQ ACK的PDU确定为第一PDU。
  16. 如权利要求14所述的装置，其特征在于，所述第一确定模块包括：
    第四确定单元，用于确定第一序列号和第三序列号，所述第一序列号为当前连续接收到的PDU的序列号中的最大序列号，所述第三序列号为大于所述第一序列号且接收到HARQ ACK的PDU的序列号中的最小序列号；
    第五确定单元，用于确定序列号在所述第一序列号和所述第三序列号之间的没有接收到HARQ ACK的至少一个PDU；
    相应地，所述第二确定模块包括：
    第六确定单元，用于将序列号在所述第一序列号和所述第三序列号之间的至少一个没有接收到HARQ ACK的PDU确定为第一PDU，或者，将序列号在所述第一序列号和所述第三序列号之间的最小序列号对应的PDU确定为第一PDU。
  17. 如权利要求14所述的装置，其特征在于，所述第一确定模块包括：
    第七确定单元，用于确定第三序列号，所述第三序列号为当前不连续接收的PDU的序列号中的最小序列号；
    第八确定单元，用于确定序列号在所述第三序列号之前的没有接收到HARQ ACK的至少一个PDU；
    相应地，所述第二确定模块包括：
    第九确定单元，用于将序列号在所述第三序列号之前的至少一个没有接收到HARQ ACK的PDU确定为第一PDU，或者，将所述第三序列号之前的最小序列号对应的PDU确定为第一PDU。
  18. 如权利要求14所述的装置，其特征在于，所述第二确定模块包括：
    执行单元，用于当根据所述没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU后，立即执行向所述接收端重新发送所述第一PDU，或者当确定当前存在传输机会时,通过所述传输机会向所述接收端发送所述第一PDU。
  19. 如权利要求14所述的装置，其特征在于，所述装置还包括：
    第三确定模块，用于确定所述第一PDU的个数，当所述第一PDU的个数大于或等于第一预设个数时，执行向所述接收端重新发送所述第一PDU；或者，
    第一计时模块，用于设置第一计时时间，并开始计时，当所述第一计时时间到达时，重新执行根据所述没有接收到HARQ ACK的至少一个PDU，确定待重传的第一PDU的步骤，若所述第一PDU的个数大于或等于所述第一预设个数时，执行向所述接收端重新发送所述第一PDU。
  20. 如权利要求14至19任一所述的装置，其特征在于，所述第二确定模块包括：
    计时单元，用于设置第二计时时间，并开始计时；
    判断单元，用于当所述第二计时时间到达时，判断所述第一PDU中是否存在还没有接收到HARQ ACK的PDU；
    发送单元，用于当所述第一PDU中存在还没有接收到HARQ ACK的PDU时，且所述还没有接收到HARQ ACK的PDU的个数大于或等于第二预设个数时，向所述接收端重新发送所述第一PDU中还没有接收到HARQ ACK的PDU。
  21. 如权利要求14至20任一所述的装置，其特征在于，所述装置还包括：
    第二计时模块，用于设置第三计时时间，并开始计时；
    判断模块，用于当所述第三计时时间到达时，判断所述第一PDU是否存在没有接收到HARQ ACK的PDU；
    发送模块，用于当所述第一PDU中仍存在没有接收到HARQ ACK的PDU时，向所述接收端重新发送所述仍没有接收到HARQ ACK的PDU。
  22. 一种数据重传装置，其特征在于，所述装置包括：
    第一确定模块，用于根据当前已接收到的协议数据单元PDU的序列号，确定需要发送端重传的第二PDU，所述当前已接收到的PUD为无线链路控制RLC PDU或者分组数据汇聚协议PDCP PDU；
    发送模块，用于向所述发送端发送针对所述第二PDU的状态报告，以使所述发送端在接收到所述第二PDU的状态报告，重新发送所述第二PDU。
  23. 根据权利要求22所述的装置，其特征在于，所述发送模块包括：
    执行单元，用于立即执行向所述发送端发送针对所述第二PDU的状态报告，或者确定当前存在传输机会时，通过所述传输机会向所述发送端发送所述第二PDU的状态报告。
  24. 根据权利要求22所述的装置，其特征在于，所述第一确定模块包括：
    第一确定单元，用于将序列号在第四序列号和第五序列号之间且未接收到的至少一个PDU确定为所述第二PDU，所述第四序列号为当前连续接收到的PDU的最大序列号，所述第五序列号为当前已接收到的PDU的序列号中的最大序列号；或者，
    第二确定单元，用于将序列号在第四序列号和第六序列号之间的至少一个PDU确定为所述第二PDU，所述第六序列号为当前不连接接收到的PDU中序列号最小的PDU的序列号； 或者，
    第三确定单元，用于将序列号在第五序列号之前的且未接收到的至少一个PDU确定为所述第二PDU；或者，
    第四确定单元，用于将序列号在第六序列号之前的且未接收到的至少一个PDU确定为所述第二PDU；或者，
    第五确定单元，用于将序列号为第七序列号及序列号在第七序列号之后的且未接收到的至少一个PDU确定为所述第二PDU，所述第七序列号为当前未正确接收的PDU中序列号最小的PDU的序列号，或者当前确定已经丢失的PDU中的序列号最小的PDU的序列号；或者，
    第六确定单元，用于将所述第四序列号和所述第六序列号之间的最小序列号对应的PDU确定为所述第二PDU。
  25. 如权利要求22所述的装置，其特征在于，所述装置还包括：
    第二确定模块，用于确定序列号在所述第四序列号和所述第五序列号之间且未接收到的PDU的个数；
    执行模块，用于当所述序列号在所述第四序列号和所述第五序列号之间且未接收到的PDU的个数大于或等于第三预设个数时，向所述发送端发送针对所述第二PDU的状态报告。
  26. 如权利要求22至25任一所述的装置，其特征在于，所述装置还包括：
    计时模块，用于设置第四计时时间，并开始计时；
    判断模块，用于当所述第四计时时间到达时，判断是否全部接收到所述第二PDU；
    第二发送模块，用于当没有全部接收到所述第二PDU时，重新向所述发送端发送针对所述第二PDU中仍没有接收到的PDU的状态报告。
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