WO2018006871A1 - 一种进行数据重传的方法和设备 - Google Patents

一种进行数据重传的方法和设备 Download PDF

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Publication number
WO2018006871A1
WO2018006871A1 PCT/CN2017/092248 CN2017092248W WO2018006871A1 WO 2018006871 A1 WO2018006871 A1 WO 2018006871A1 CN 2017092248 W CN2017092248 W CN 2017092248W WO 2018006871 A1 WO2018006871 A1 WO 2018006871A1
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Prior art keywords
retransmission
data packet
node
transmission
protocol layer
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PCT/CN2017/092248
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English (en)
French (fr)
Inventor
赵亚利
刘佳敏
许芳丽
皮埃尔
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电信科学技术研究院
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Application filed by 电信科学技术研究院 filed Critical 电信科学技术研究院
Priority to JP2019500579A priority Critical patent/JP2019527503A/ja
Priority to KR1020197002406A priority patent/KR20190022741A/ko
Priority to EP17823683.2A priority patent/EP3484081B1/en
Priority to US16/316,341 priority patent/US11223449B2/en
Publication of WO2018006871A1 publication Critical patent/WO2018006871A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/189—Transmission or retransmission of more than one copy of a message
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1809—Selective-repeat protocols
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • 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
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1628—List acknowledgements, i.e. the acknowledgement message consisting of a list of identifiers, e.g. of sequence numbers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/188—Time-out mechanisms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/32—Flow control; Congestion control by discarding or delaying data units, e.g. packets or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols
    • 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
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1642—Formats specially adapted for sequence numbers

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method and device for performing data retransmission.
  • eMBB enhanced Mobile Broadband
  • Ultra-dense networking is a trend in the development of mobile communication systems in the future.
  • some protocol functions need to be processed centrally.
  • a two-layer structure of a centralized processing node and a distributed processing node is formed, and the distributed processing node is also called a TRP (Transmission Reception Point).
  • TRP Transmission Reception Point
  • the centralized processing node according to different functions, it can be further divided into a control plane of the centralized processing node and a user plane of the centralized processing node.
  • Dual connectivity means that the terminal has a connection with two base stations at the same time, and data transmission can be performed through two base stations.
  • the dual-connected user plane architecture is shown in Figure 1.
  • a typical difference between the dual connectivity of 5G and 3GPP Rel-12/13 is that among the multiple frequency points corresponding to multiple connections in the system in 5G, it is likely that some of the frequency points are high frequency points (such as 6 GHz) or unlicensed spectrum. .
  • the transmission characteristics are different from the traditional LTE (Long Term Evolution) frequency, and the signal transmission may be intermittent. Therefore, it is necessary to consider supporting ARQ across different connections in 5G. mechanism.
  • the present invention provides a method and device for performing data retransmission to solve the problem that there is currently no retransmission scheme supporting different connections existing in the prior art.
  • a method for performing data retransmission is provided by an embodiment of the present invention, where the method includes:
  • the target protocol layer responsible for the transmission management of the transmission node in the transmitting device selects at least one transmission node for the retransmission data packet corresponding to the terminal after determining that the transmission node corresponding to the terminal satisfies the retransmission condition of the transmission node;
  • the target protocol layer in the transmitting device performs data packet retransmission through the selected transport node.
  • the retransmitted data packet includes a PDU and/or a PDU segment corresponding to the target protocol layer.
  • the target protocol layer in the sending device performs data packet retransmission by using the selected transit node, including:
  • the target protocol layer in the transmitting device sends the retransmitted data packet to the selected transport node, so that the transport node sends the received retransmitted data packet.
  • the sending device is a network side device
  • the method further includes:
  • the target protocol layer in the sending device determines, according to the capability report information of the terminal, that the terminal supports the retransmission function across the transit node.
  • the sending device is a network side device
  • the method further includes:
  • the sending device notifies the terminal to enable the uplink and/or downlink cross-transport node retransmission function.
  • enabling the cross-transport node retransmission condition includes some or all of the following conditions:
  • the target protocol layer in the sending device determines, according to the received status report from the lower layer, that there is a data packet that is not successfully sent;
  • the target protocol layer in the sending device determines, according to the received status report from the receiving device, that the data packet is not successfully sent;
  • the target protocol layer in the sending device determines that there is a data packet that has not been successfully transmitted according to the retransmission determination timer timeout.
  • the status report of the receiving device is sent by the protocol layer of the target device layer in the receiving device and the target protocol layer in the sending device, after receiving the PDU including the probe indication; or
  • the status report of the receiving device is sent after the protocol layer of the target device layer peering in the receiving device and the transmitting device detects that the PDU is lost; or
  • the status report of the receiving device is sent after the protocol layer of the target device layer peering in the receiving device and the transmitting device receives the PDU segment loss indication sent by the lower layer.
  • the status report of the receiving device is segmented based on a target protocol layer PDU or a PDU corresponding to a target protocol layer PDU.
  • the target protocol layer in the sending device selects at least one transit node for the retransmission data packet corresponding to the terminal, including:
  • the target protocol layer in the sending device selects at least one transmitting node from other transmitting nodes except the specific transmitting node corresponding to the terminal, where the specific transmitting node is a transmitting node that fails to transmit and the current link is not restored. .
  • the method further includes:
  • the target protocol layer in the sending device determines that the number of transmission nodes that have been retransmitted does not exceed N, where N is a positive integer; and/or,
  • the target protocol layer in the sending device determines that the retransmission prohibition timer corresponding to the retransmission data packet does not time out.
  • the method further includes:
  • the target protocol layer in the sending device selects an initial transport data packet or a retransmitted data packet sent by the transport node from the transmission window in an order that the SN is from small to large.
  • the lower boundary of the sending window is that the sending device determines the maximum value of the SN in the discarded data packet and the SN in the correctly received data packet, and the sum of the step values;
  • the length of the transmission window is a set length.
  • the method further includes:
  • the sending device After the windowing condition is satisfied, the sending device performs a window pulling operation on the sending window;
  • windowing condition is part or all of the following:
  • the retransmission prohibition timer of the PDU corresponding to the lower boundary of the sending window is timed out
  • the PDU corresponding to the lower boundary of the sending window is retransmitted by the N transmitting nodes, and the retransmission fails, and N is a positive integer;
  • the PDU corresponding to the lower boundary of the transmission window is successfully transmitted.
  • the method further includes:
  • the transmitting device preferentially transmits the retransmission data packet.
  • a transmitting device for performing data retransmission is provided by the embodiment of the present invention, where the sending device includes: a processing module and a transmission module, where the processing module and the transmission module are located in a target protocol layer responsible for transmission management across the transmission node;
  • the processing module is configured to: after determining that the transmission node corresponding to the terminal satisfies the retransmission condition of the trans-transport node, select at least one transmission node for the retransmission data packet corresponding to the terminal;
  • the transmission module is configured to perform data packet retransmission by using a transmission node selected by the processing module.
  • the retransmitted data packet includes a PDU and/or a PDU segment corresponding to the target protocol layer.
  • the transmission module is specifically configured to:
  • the sending device is a network side device
  • the processing module is further configured to:
  • the sending device is a network side device
  • the processing module is further configured to:
  • At least one transmission node is selected for the retransmission data packet corresponding to the terminal.
  • enabling the cross-transport node retransmission condition includes some or all of the following conditions:
  • the retransmission decision timer timeout it is determined that there is a packet that has not been successfully transmitted.
  • the status report of the receiving device is sent by the protocol layer of the target device layer in the receiving device and the target protocol layer in the sending device, after receiving the PDU including the probe indication; or
  • the status report of the receiving device is sent after the protocol layer of the target device layer peering in the receiving device and the transmitting device detects that the PDU is lost; or
  • the status report of the receiving device is sent after the protocol layer of the target device layer peering in the receiving device and the transmitting device receives the PDU segment loss indication sent by the lower layer.
  • the status report of the receiving device is segmented based on a target protocol layer PDU or a PDU corresponding to a target protocol layer PDU.
  • processing module is specifically configured to:
  • processing module is further configured to:
  • the weight corresponding to the terminal is Transmitting a packet selects at least one transit node, where N is a positive integer; and/or,
  • At least one transmission node is selected for the retransmission data packet corresponding to the terminal.
  • the transmission module is further configured to:
  • the initial transport packet or retransmitted packet transmitted through the transport node is selected from the transmission window in the order of SN from small to large.
  • the lower boundary of the sending window is that the sending device determines the maximum value of the SN in the discarded data packet and the SN in the correctly received data packet, and the sum of the step values;
  • the length of the transmission window is a set length.
  • processing module is further configured to:
  • the window is opened for the sending window
  • windowing condition is part or all of the following:
  • the retransmission prohibition timer of the PDU corresponding to the lower boundary of the sending window is timed out
  • the PDU corresponding to the lower boundary of the sending window is retransmitted by the N transmitting nodes, and the retransmission fails, and N is a positive integer;
  • the PDU corresponding to the lower boundary of the transmission window is successfully transmitted.
  • the transmission module is further configured to:
  • the retransmission data packet is preferentially transmitted.
  • a transceiver for receiving and transmitting data under the control of a processor.
  • the target protocol layer responsible for transmission management across the transmission node is in the transmitting device. After the transmission node corresponding to the terminal satisfies the retransmission condition of the cross-transport node, at least one transmission node is selected for the retransmission data packet corresponding to the terminal; and the data packet retransmission is performed by the selected transmission node. After the transmission node corresponding to the terminal is determined to satisfy the retransmission condition of the cross-transport node, at least one transmission node is selected for the retransmission data packet corresponding to the terminal, thereby realizing retransmission across different connections.
  • 1 is a user plane architecture diagram of a dual connectivity in the background art
  • FIG. 2 is a schematic flowchart of a method for performing data retransmission according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a transmission window according to an embodiment of the present invention.
  • FIG. 4 is a schematic flowchart of a method for reporting and functioning a terminal according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a transmitting end according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a receiving end according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a transmitting device that performs data retransmission according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of another transmitting device for performing data retransmission according to an embodiment of the present invention.
  • the method for performing data retransmission in the embodiment of the present invention includes:
  • Step 200 The target protocol layer in the transmitting device responsible for transmission management across the transport node is determined at the end After the transmission node corresponding to the terminal satisfies the retransmission condition of the cross-transport node, at least one transmission node is selected for the retransmission data packet corresponding to the terminal;
  • Step 201 The target protocol layer in the sending device performs data packet retransmission through the selected transit node.
  • a target protocol layer responsible for transmission management of the transmission node may be added to the transmitting device, where the target protocol layer is the retransmission data corresponding to the terminal after the corresponding transmission node of the terminal satisfies the retransmission condition of the trans-transport node.
  • the packet selects at least one transport node and performs packet retransmission through the selected transport node. After the transmission node corresponding to the terminal is determined to satisfy the retransmission condition of the cross-transport node, at least one transmission node is selected for the retransmission data packet corresponding to the terminal, thereby realizing retransmission across different connections; further, the transmission can be improved. System transmission reliability and throughput.
  • the target protocol layer may be a logic protocol layer, implemented by software, which can obtain transmission states from different nodes, and then make a unified judgment to determine whether cross-node retransmission is required.
  • the function it is also possible to attach the function to other logical units or physical entities, and the function is implemented by the same, which is easily understood by those skilled in the art, and the following embodiments continue to explain the manner of increasing the target protocol layer.
  • the network side For determining that the corresponding transmission node of the terminal satisfies the retransmission condition of the cross-transport node, the network side looks at a different transmission carrier or a transceiver node on the network side; from the UE side, it is a different transmission channel configured, which can be characterized as a logical channel or Different RLC entities, etc.
  • the retransmission data packet corresponding to the terminal means that the "retransmission data packet" is a data packet retransmitted to the terminal or retransmitted by the terminal.
  • the sending device is a network side device
  • the receiving device is a terminal
  • the transmitting device is a terminal
  • the receiving device is a network side device.
  • the network side device in the embodiment of the present invention may be a base station (such as a macro base station, a home base station, etc.), or may be another network side device.
  • the terminal in the embodiment of the present invention may be a device such as a mobile phone or a pad.
  • the retransmission data packet may include a PDU (Packet Data Unit) corresponding to the target protocol layer; or may include a target protocol layer pair.
  • the PDU segment should be included; it may also include the PDU and PDU segment corresponding to the target protocol layer.
  • the target protocol layer in the sending device performs data packet retransmission through the selected transit node, specifically, the target protocol layer sends the retransmitted data packet to the selected transit node, so that the transmitting node sends the received packet. Retransmit the packet.
  • the target protocol layer in the network side device determines, according to the capability reporting information of the terminal, that the terminal supports the retransmission function corresponding to the terminal after supporting the retransmission function of the transmitting node. At least one transport node.
  • cross-node retransmission in the prior art can occur during the handover process, but the process involves an RRC process, and the entire retransmission process is slow.
  • the cross-node retransmission in the embodiment of the present invention corresponds to the underlying process of non-RRC process participation.
  • the main process of this function is to improve the data transmission success rate and speed under the configuration that multiple nodes simultaneously perform service transmission services for the UE.
  • the terminal needs to report to the network side whether it supports the retransmission function across the transit nodes.
  • the sending device If the sending device is a terminal, the sending device needs to report to the network side whether it supports the retransmission function across the transmitting node.
  • 1 bit can be used to indicate whether the terminal supports capability indication information for retransmission across the transit node, where 1 indicates support and 0 indicates no support.
  • the sending device selects at least one transmitting node for the retransmission data packet corresponding to the terminal after notifying the terminal to enable the uplink and/or downlink cross-transport node retransmission function.
  • the network side device may determine whether to use the multi-transport node to transmit according to the data volume of the terminal. When the terminal needs to use the multi-transport node to transmit, the terminal device determines whether the terminal re-transmission function is enabled.
  • the factors to be considered in determining whether to enable the retransmission function across the transmission node include one or a combination of the following:
  • the type of service of the terminal is the type of service of the terminal.
  • the network side when the network side decides that the terminal needs to use the multi-transport node to transmit, and the terminal capability supports retransmission across the transmission node, and the service to be transmitted uses the acknowledge mode (AM mode) in the access layer, and one of the transmission nodes corresponds to the high frequency point, Then, the network side can determine that the retransmission function of the cross-transport node is enabled for the terminal.
  • AM mode acknowledge mode
  • the sending device selects at least one transmission for the retransmission data packet corresponding to the terminal after the uplink and/or downlink cross-transmission node retransmission function is enabled according to the received notification from the network side device. node.
  • the retransmission condition of the cross-transport node in the embodiment of the present invention may include part or all of the following conditions:
  • the target protocol layer in the sending device determines, according to the received status report from the lower layer, that the data packet is not successfully sent;
  • the target protocol layer in the sending device determines, according to the received status report from the receiving device, that the data packet is not successfully sent;
  • the target protocol layer in the sending device determines, according to the retransmission determination timer timeout, that there is a data packet that is not successfully sent.
  • the lower layer in the transmitting device generates a status report based on the transmission result of the PDU and/or PDU segment, and sends a status report to the upper layer.
  • the status report here is based on the PDU segment corresponding to the target protocol layer PDU or the target protocol layer PDU. For example, if a PDU is sent, a status report is generated based on the PDU; and if, for example, a PDU segment is sent, a status report is generated based on the PDU segmentation.
  • the status report includes information on whether the corresponding PDU and/or PDU segment was sent successfully.
  • the receiving device For condition two, the receiving device generates a status report based on the transmission result of the PDU and/or PDU segment, and transmits a status report to the transmitting device.
  • the status report here is based on the PDU segment corresponding to the target protocol layer PDU or the target protocol layer PDU. For example, if a PDU is received, a status report is generated based on the PDU; and if, for example, a PDU segment is received, a status report is generated based on the PDU segmentation.
  • the status report includes information on whether the corresponding PDU and/or PDU segment was sent successfully.
  • the status report of the receiving device is in the receiving device and in the sending device.
  • the protocol layer of the standard protocol layer is sent after receiving the PDU containing the discovery indication; or
  • the status report of the receiving device is sent after the protocol layer of the target device layer peering in the receiving device and the transmitting device detects that the PDU is lost; or
  • the status report of the receiving device is sent after the protocol layer of the target device layer peering in the receiving device and the transmitting device receives the PDU segment loss indication sent by the lower layer.
  • the protocol layer of the target device layer in the receiving device and the target protocol layer in the transmitting device is the same protocol layer as the layer where the target device layer of the transmitting device is located.
  • the sending device After sending the data packet to the receiving device, the sending device sends a search indication to the receiving device;
  • the receiving device After receiving the PDU containing the discovery indication, the receiving device returns a status report for the received data packet to the sending device.
  • the link of the transmitting node that fails to transmit may have a problem, it may not be selected from such a transmitting node when performing the transmission.
  • the target protocol layer in the sending device selects at least one transmitting node from the other transmitting nodes except the specific transmitting node corresponding to the terminal, where the specific transmitting node fails to be sent and the current link is not restored. Transfer node.
  • the transmitting device may determine, according to the channel quality feedback result of the UE, the transmission status of other data packets, and the like, whether the current link of the transmitting node that failed to be transmitted is restored.
  • the above-mentioned other transmission nodes than the specific transmission node may be used for retransmission or for initial transmission.
  • the number N of transmission nodes allowing PDU retransmission may be limited or a retransmission prohibition timer may be introduced for the PDU.
  • the target protocol layer in the sending device selects at least one transport node for the retransmission data packet corresponding to the terminal after determining that the number of the transport nodes that have been retransmitted does not exceed N, where N is positive Integer; and/or,
  • the target protocol layer in the sending device selects at least one transmission node for the retransmission data packet corresponding to the terminal.
  • N 11
  • retransmission data packet A can continue to retransmit
  • Packet A cannot continue to retransmit.
  • the retransmission prohibition timer may be started after the initial transmission of the data packet, or may be started after the data packet is retransmitted for the first time.
  • the target protocol layer responsible for retransmission across the transport nodes in the transmitting device can also maintain a transmit window.
  • the send window maintenance can be in the pull window mode (PULL mode).
  • the lower boundary of the transmission window WINDOW_LOW is the sum of the maximum value of the SN in the discarded data packet and the SN in the correctly received data packet, and the step value;
  • the length of the transmission window is the set length WINDOW_LENGTH.
  • the WINDOW_LOW value of the lower boundary of the transmission window is determined by the sender to discard or has been correctly received by the receiver to obtain a continuous SN maximum value of +1.
  • the SNs in the discarded data packets are 3 and 6, and the SNs in the correctly received data packets are 1, 2, 4, 5, and 7, and the maximum value SN is 7.
  • the sending device performs a window pulling operation on the sending window after the windowing condition is satisfied;
  • windowing condition is part or all of the following:
  • the retransmission prohibition timer of the PDU corresponding to the lower boundary of the sending window is timed out
  • the PDU corresponding to the lower boundary of the sending window is retransmitted by the N transmitting nodes, and the retransmission fails, and N is a positive integer;
  • the PDU corresponding to the lower boundary of the transmission window is successfully transmitted.
  • the PDU corresponding to the lower boundary of the sending window is the PDU of the data packet corresponding to the lower boundary of the sending window.
  • the SNs in the discarded data packets are 3 and 6, and the SNs in the correctly received data packets are 1, 2, 4, 5, and 7.
  • the maximum value SN is 7, and the PDU corresponding to the lower boundary of the transmission window is the PDU of the data packet whose SN is 7.
  • the SN in the discarded data packet is 3 and 6, and the SN in the correctly received data packet
  • the PDU corresponding to the lower boundary of the transmission window is the PDU of the data packet whose SN is 6.
  • the target protocol layer in the sending device selects an initial transport data packet or a retransmitted data packet sent by the transport node from the sending window in an order that the SN is from small to large.
  • the sending window contains 3 data packets, and the SNs are 6, 8, and 9, respectively, the data packet with the SN of 6 is sent.
  • the transmitting device preferentially transmits the retransmission data packet.
  • the number of low-level ARQ retransmissions can be reduced, and RLF (Radio Link Failure) is not triggered when the low-level ARQ reaches the maximum number of times.
  • Embodiment 1 As shown in FIG. 4, a method for performing reporting and function opening in a terminal according to an embodiment of the present invention includes:
  • Step 1 The terminal reports the terminal capability to the network side.
  • the terminal capability reported by the terminal carries the capability indication information of whether the terminal supports retransmission across the transit node.
  • the capability indication information indicating whether the terminal supports retransmission across the transit node can be used, and 1 indicates support, and 0 indicates no support.
  • Step 2 The network side decides whether to enable the cross-transport node retransmission function for the terminal.
  • the network side determines whether to use the multi-transport node to transmit according to the data volume of the terminal. When the terminal needs to use the multi-transport node to transmit, it will judge whether the terminal enables the retransmission function across the transmission node.
  • the factors to be considered in determining whether to enable the retransmission function across the transmission node include one or a combination of the following:
  • the type of service of the terminal is the type of service of the terminal.
  • the network side decides that the terminal needs to use multi-transport node transmission, and the terminal capability supports cross-transmission
  • the transmission node retransmits, and the service to be transmitted uses the acknowledgment mode (AM mode) in the access layer, and one of the transmission nodes corresponds to the high frequency point, and the network side can determine that the terminal re-transmission function is enabled for the terminal.
  • AM mode acknowledgment mode
  • the network side may determine, according to the uplink and the downlink, whether the cross-transmission node retransmission function needs to be enabled for the terminal.
  • Step 3 If the network side determines that the terminal needs to enable the cross-transport node retransmission function, the configuration terminal starts the cross-transport node retransmission function.
  • the terminal transmission node retransmission function can be enabled by the signaling configuration terminal.
  • the network side can be separately configured based on the uplink and the downlink.
  • Embodiment 2 A status report based on local low layer feedback triggers retransmission across a transit node.
  • Step 1 The sending device sends data.
  • the transmitting device needs to add one or a combination operation of SN, header compression and encryption, data packet repetition or segmentation when performing data transmission, and then select at least one by a target protocol layer responsible for transmission management across the transmission node.
  • the transmitting node sends the data packet to the selected transport node.
  • Each transmitting node performs one or a combination of ARQ, segmentation/serialization, etc. after receiving the data packet, and performs MAC multiplexing, and then performs HARQ (Hybrid Automatic Repeat Request) if necessary. .
  • sender architecture shown in Figure 5 is only one possible implementation. Embodiments of the present invention are applicable to an architecture that includes a target protocol layer responsible for transmission management across transport nodes.
  • the transmitting device selects a PDU in the transmission window waiting for the initial transmission or waiting for retransmission across the node according to the criterion that the SN arrives from small.
  • the PDU is delivered to the lower layer, and the retransmission prohibition timer corresponding to the PDU can also be started.
  • Step 2 The sending device obtains local sending status feedback.
  • the target protocol layer of the sending device receives status reports from the lower layers.
  • Step 3 The transmitting device performs cross-node retransmission processing.
  • the transmitting device After the transmitting device determines that there is a data packet that is not successfully transmitted according to the received status report of the data packet transmitted from the lower layer for the transport node M, it is determined that the transport node M fails to successfully send the corresponding PDU or PDU segment, and determines that the need is needed. Perform cross-node retransmission processing.
  • the target protocol layer transmission node M responsible for transmission management across the transmission node has a radio link problem, and reconfirms the transmission node M link before recovery (such as UE-based channel quality feedback results or other transmissions through the transmission node)
  • the transmission condition of the data packet judges whether the transmission node M link is restored, and no new data (including initial transmission and retransmission data) is transmitted through the transmission node.
  • the target protocol layer selects a suitable transport node for the retransmitted data packet, and performs data packet retransmission through the selected transport node.
  • the unit of the data packet retransmitted across the node in this manner is the PDU or PDU segment corresponding to the protocol layer responsible for transmission management across the transport node.
  • the sending device performs maintenance on the sending window.
  • the retransmission prohibition timer of the PDU corresponding to the lower boundary of the sending window is timed out
  • the PDU corresponding to the lower boundary of the sending window is retransmitted by the N transmitting nodes, and the retransmission fails, and N is a positive integer;
  • the PDU corresponding to the lower boundary of the transmission window is successfully transmitted.
  • Embodiment 3 Triggering retransmission across a transit node based on a status report of a receiving device.
  • Step 1 The sending device sends data.
  • the transmitting device needs to add one or a combination operation of SN, header compression and encryption, data packet repetition or segmentation when performing data transmission, and then select at least one by a target protocol layer responsible for transmission management across the transmission node.
  • the transmitting node sends the data packet to the selected transport node.
  • Each transmitting node performs one or a combination of ARQ, segmentation/serialization, etc. after receiving the data packet, and performs MAC multiplexing, and then performs HARQ if necessary.
  • the transmitting device selects a PDU in the transmission window waiting for the initial transmission or waiting for retransmission across the node according to the criterion that the SN arrives from small.
  • the PDU is delivered to the lower layer, and the retransmission prohibition timer corresponding to the PDU can also be started.
  • Step 2 The sending device obtains local sending status feedback.
  • the target protocol layer of the transmitting device receives a status report from the receiving device.
  • the processing entity corresponding to the transmission node demultiplexes the data received through the HARQ, performs repeated detection and reordering, and then performs reassembly.
  • the receiving device repeatedly detects and reorders data packets received from a plurality of processing entities corresponding to the transmitting node, and then performs decryption and decompression.
  • receiver architecture shown in Figure 6 is only one possible implementation. Embodiments of the present invention are applicable to any architecture that is capable of receiving data transmitted by a transmitting node.
  • the feedback trigger condition includes some or all of the following:
  • a protocol layer in the receiving device and a target protocol layer peer in the transmitting device receives a PDU including a probe indication
  • the protocol layer of the target device layer peering in the receiving device and the transmitting device detects that the PDU is lost
  • the protocol layer of the target device layer peering in the receiving device and the transmitting device receives the PDU segment loss indication sent by the lower layer.
  • the content of the status report may be a PDU-based status report, or may be a status report based on a PDU segment.
  • Step 3 The sender performs cross-node retransmission processing.
  • the transmitting device After the transmitting device determines that there is a data packet that is not successfully transmitted according to the received status report of the data packet transmitted from the receiving device for the transmitting node M, it is determined that the transmitting node M fails to successfully send the corresponding PDU or PDU segment, and determines Cross-node retransmission processing is required.
  • the target protocol layer transmission node M responsible for transmission management across the transmission node has a radio link problem, and reconfirms the transmission node M link before recovery (such as UE-based channel quality feedback results or other transmissions through the transmission node)
  • the transmission condition of the data packet judges whether the transmission node M link is restored, and no new data (including initial transmission and retransmission data) is transmitted through the transmission node.
  • the target protocol layer selects a suitable transport node for the retransmitted data packet, and performs data packet retransmission through the selected transport node.
  • the unit of the data packet retransmitted across the node in this manner is the PDU or PDU segment corresponding to the protocol layer responsible for transmission management across the transport node.
  • the sending device performs maintenance on the sending window.
  • the retransmission prohibition timer of the PDU corresponding to the lower boundary of the sending window is timed out
  • the PDU corresponding to the lower boundary of the sending window is retransmitted by the N transmitting nodes, and the retransmission fails, and N is a positive integer;
  • the PDU corresponding to the lower boundary of the transmission window is successfully transmitted.
  • the embodiment of the present invention further provides a transmitting device for performing data retransmission. Since the principle of solving the problem is similar to the method for performing data retransmission in the embodiment of the present invention, the implementation of the device may be referred to. The implementation of the method, the repetition will not be repeated.
  • the transmitting device for performing data retransmission in the embodiment of the present invention includes: a processing module 700 and a transmission module 701, where the processing module 700 and the transmission module 701 are located in a target protocol layer responsible for transmission management across the transmission node;
  • the processing module 700 is configured to: after determining that the transmission node corresponding to the terminal satisfies the retransmission condition of the trans-transport node, select at least one transmission node for the retransmission data packet corresponding to the terminal;
  • the transmission module 701 is configured to perform data packet weight by using a transmission node selected by the processing module. pass.
  • the retransmitted data packet includes a PDU and/or a PDU segment corresponding to the target protocol layer.
  • the transmission module 701 is configured to:
  • the sending device is a network side device
  • the processing module 700 is further configured to:
  • the sending device is a network side device
  • the processing module 700 is further configured to:
  • At least one transmission node is selected for the retransmission data packet corresponding to the terminal.
  • enabling the cross-transport node retransmission condition includes some or all of the following conditions:
  • the retransmission decision timer timeout it is determined that there is a packet that has not been successfully transmitted.
  • the status report of the receiving device is sent by the protocol layer of the target device layer in the receiving device and the target protocol layer in the sending device, after receiving the PDU including the probe indication; or
  • the status report of the receiving device is sent after the protocol layer of the target device layer peering in the receiving device and the transmitting device detects that the PDU is lost; or
  • the status report of the receiving device is sent after the protocol layer of the target device layer peering in the receiving device and the transmitting device receives the PDU segment loss indication sent by the lower layer.
  • the status report of the receiving device is segmented based on a target protocol layer PDU or a PDU corresponding to a target protocol layer PDU.
  • processing module 700 is specifically configured to:
  • processing module 700 is further configured to:
  • N is a positive integer
  • At least one transmission node is selected for the retransmission data packet corresponding to the terminal.
  • the transmission module 701 is further configured to:
  • the initial transport packet or retransmitted packet transmitted through the transport node is selected from the transmission window in the order of SN from small to large.
  • the lower boundary of the sending window is that the sending device determines the maximum value of the SN in the discarded data packet and the SN in the correctly received data packet, and the sum of the step values;
  • the length of the transmission window is a set length.
  • processing module 700 is further configured to:
  • the window is opened for the sending window
  • windowing condition is part or all of the following:
  • the retransmission prohibition timer of the PDU corresponding to the lower boundary of the sending window is timed out
  • the PDU corresponding to the lower boundary of the sending window is retransmitted by the N transmitting nodes, and the retransmission fails, and N is a positive integer;
  • the PDU corresponding to the lower boundary of the transmission window is successfully transmitted.
  • the transmission module 701 is further configured to:
  • the retransmission data packet is preferentially transmitted.
  • another transmitting device for performing data retransmission includes:
  • the processor 801 located at the target protocol layer responsible for transmission management across the transport nodes, is used to read the programs in the memory 804 and perform the following processes:
  • the at least one transmission node is selected for the retransmission data packet; the data packet retransmission is performed by the selected transmission node;
  • the transceiver 802 is configured to receive and transmit data under the control of the processor 801.
  • the retransmitted data packet includes a PDU and/or a PDU segment corresponding to the target protocol layer.
  • the processor 801 is configured to:
  • the sending device is a network side device
  • the processor 801 is further configured to:
  • the sending device is a network side device
  • the processor 801 is further configured to:
  • At least one transmission node is selected for the retransmission data packet corresponding to the terminal.
  • enabling the cross-transport node retransmission condition includes some or all of the following conditions:
  • the retransmission decision timer timeout it is determined that there is a packet that has not been successfully transmitted.
  • the status report of the receiving device is sent by the protocol layer of the target device layer in the receiving device and the target protocol layer in the sending device, after receiving the PDU including the probe indication; or
  • the status report of the receiving device is sent after the protocol layer of the target device layer peering in the receiving device and the transmitting device detects that the PDU is lost; or
  • the status report of the receiving device is sent after the protocol layer of the target device layer peering in the receiving device and the transmitting device receives the PDU segment loss indication sent by the lower layer.
  • the status report of the receiving device is based on a target protocol layer PDU or a target protocol.
  • Layer PDU corresponding to the PDU segmentation.
  • the processor 801 is specifically configured to:
  • the processor 801 is further configured to:
  • N is a positive integer
  • At least one transmission node is selected for the retransmission data packet corresponding to the terminal.
  • the processor 801 is further configured to:
  • the initial transport packet or retransmitted packet transmitted through the transport node is selected from the transmission window in the order of SN from small to large.
  • the lower boundary of the sending window is that the sending device determines the maximum value of the SN in the discarded data packet and the SN in the correctly received data packet, and the sum of the step values;
  • the length of the transmission window is a set length.
  • the processor 801 is further configured to:
  • the window is opened for the sending window
  • windowing condition is part or all of the following:
  • the retransmission prohibition timer of the PDU corresponding to the lower boundary of the sending window is timed out
  • the PDU corresponding to the lower boundary of the sending window is retransmitted by the N transmitting nodes, and the retransmission fails, and N is a positive integer;
  • the PDU corresponding to the lower boundary of the transmission window is successfully transmitted.
  • the processor 801 is further configured to:
  • the retransmission data packet is preferentially transmitted.
  • bus 800 may include any number of interconnected buses and bridges, and bus 800 will include one or more processors represented by processor 801.
  • the various circuits of the memory represented by memory 804 are linked together.
  • the bus 800 can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art, and therefore, will not be further described herein.
  • Bus interface 803 provides an interface between bus 800 and transceiver 802.
  • Transceiver 802 can be an element or a plurality of elements, such as multiple receivers and transmitters, providing means for communicating with various other devices on a transmission medium.
  • Data processed by processor 801 is transmitted over wireless medium via antenna 805. Further, antenna 805 also receives the data and transmits the data to processor 801.
  • the processor 801 is responsible for managing the bus 800 and the usual processing, and can also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions.
  • the memory 804 can be used to store data used by the processor 801 when performing operations.
  • the processor 801 may be a CPU (Central Embedded Device), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a CPLD (Complex Programmable Logic Device). , complex programmable logic devices).
  • CPU Central Embedded Device
  • ASIC Application Specific Integrated Circuit
  • FPGA Field-Programmable Gate Array
  • CPLD Complex Programmable Logic Device
  • the application can also be implemented in hardware and/or software (including firmware, resident software, microcode, etc.). Still further, the application can take the form of a computer program product on a computer usable or computer readable storage medium having computer usable or computer readable program code embodied in a medium for use by an instruction execution system or Used in conjunction with the instruction execution system.
  • a computer usable or computer readable medium can be any medium that can contain, store, communicate, communicate, or transport a program for use by an instruction execution system, apparatus, or device. Use, or in conjunction with, an instruction to execute a system, device, or device.

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Abstract

一种进行数据重传的方法和设备，用以解决现有技术中存在的目前没有一种支持跨不同连接的重传方案的问题。本发明实施例发送设备中的负责跨传输节点传输管理的目标协议层在确定终端对应的传输节点满足跨传输节点重传条件后，为所述终端对应的重传数据包选择至少一个传输节点；并通过选择的传输节点进行数据包重传。由于能够在确定终端对应的传输节点满足跨传输节点重传条件后，为所述终端对应的重传数据包选择至少一个传输节点，从而实现了跨不同连接的重传；进一步提高系统传输的可靠性和吞吐量。

Description

一种进行数据重传的方法和设备
本申请要求在2016年7月8日提交中国专利局、申请号为201610539425.9、发明名称为“一种进行数据重传的方法和设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及无线通信技术领域，特别涉及一种进行数据重传的方法和设备。
背景技术
未来移动通信系统主要有三类业务：
eMBB(enhanced Mobile Broadband，增强型宽带通信)；
mMTC(massive Machine Type Communications，大量机器类型通信)；
URLLC(Ultra-Reliable and Low Latency Communications，高可靠低时延通信)。
超密集组网是未来移动通信系统发展的一个趋势，在超密集组网情况下，为了实现对大量分布式处理节点的统一控制面管理，需要将部分协议功能进行集中式处理。这样就形成了集中处理节点和分布式处理节点的双层结构，分布式处理节点也称为TRP(Transmission Reception Point，发送接收节点)。对于集中处理节点，根据功能不同，又可以进一步划分为集中处理节点的控制面和集中处理节点的用户面。
双连接是指终端同时和两个基站之间存在连接，可以通过两个基站进行数据传输。双连接的用户面架构图如图1所示。
对于3GPP Rel-12/13的双连接，仅支持每个传输节点内部RLC(Radio Link Control，无线链路控制)层的ARQ(Automatic Repeat reQuest，自动重传请求)重传，不支持跨不同传输节点的数据重传。
5G和3GPP Rel-12/13的双连接的一个典型不同之处在于5G中系统中多连接对应的多个频点之中很可能有部分频点是高频点(比如6GHz)或者非授权频谱。对于高频点以及非授权频谱，其传输特性不同于传统的LTE(Long Term Evolution，长期演进)频点，信号传输可能是时断时续的，因此需要考虑在5G中支持跨不同连接的ARQ机制。
综上所述，目前没有一种支持跨不同连接的重传方案。
发明内容
本发明提供一种进行数据重传的方法和设备，用以解决现有技术中存在的目前没有一种支持跨不同连接的重传方案的问题。
本发明实施例提供的一种进行数据重传的方法，该方法包括：
发送设备中的负责跨传输节点传输管理的目标协议层在确定终端对应的传输节点满足跨传输节点重传条件后，为所述终端对应的重传数据包选择至少一个传输节点；
所述发送设备中的目标协议层通过选择的传输节点进行数据包重传。
可选的，所述重传数据包包括所述目标协议层对应的PDU和/或PDU分段。
可选的，所述发送设备中的目标协议层通过选择的传输节点进行数据包重传，包括：
所述发送设备中的目标协议层将所述重传数据包发送给选择的传输节点，以使所述传输节点发送收到的重传数据包。
可选的，所述发送设备为网络侧设备；
所述发送设备中的所述目标协议层为所述终端对应的重传数据包选择至少一个传输节点之前，还包括：
所述发送设备中的所述目标协议层根据所述终端的能力上报信息确定所述终端支持跨传输节点重传功能。
可选的，所述发送设备为网络侧设备；
所述发送设备中的所述目标协议层为所述终端对应的重传数据包选择至少一个传输节点之前，还包括：
所述发送设备通知所述终端开启上行和/或下行跨传输节点重传功能。
可选的，开启所述跨传输节点重传条件包括下列条件中的部分或全部：
所述发送设备中的目标协议层根据收到的来自低层的状态报告确定有未发送成功的数据包；
所述发送设备中的目标协议层根据收到的来自接收设备的状态报告确定有未发送成功的数据包；
所述发送设备中的目标协议层根据重传判定定时器超时确定有未成功发送的数据包。
可选的，所述接收设备的状态报告是接收设备中和所述发送设备中的目标协议层对等的协议层接收到包含探寻指示的PDU后发送的；或，
所述接收设备的状态报告是所述接收设备中和所述发送设备中的目标协议层对等的协议层检测到PDU丢失后发送的；或，
所述接收设备的状态报告是所述接收设备中和所述发送设备中的目标协议层对等的协议层接收到低层发送的PDU分段丢失指示后发送的。
可选的，所述接收设备的状态报告是基于目标协议层PDU或者目标协议层PDU对应的PDU分段的。
可选的，所述发送设备中的目标协议层为所述终端对应的重传数据包选择至少一个传输节点，包括：
所述发送设备中的目标协议层从所述终端对应的除特定传输节点之外的其他传输节点中选择至少一个传输节点，其中所述特定传输节点为发送失败且当前链路未恢复的传输节点。
可选的，所述发送设备中的所述目标协议层为所述终端对应的重传数据包选择至少一个传输节点之前，还包括：
所述发送设备中的所述目标协议层确定已进行重传的传输节点的数量未超过N，其中N为正整数；和/或，
所述发送设备中的所述目标协议层确定所述重传数据包对应的重传禁止定时器未超时。
可选的，该方法还包括：
所述发送设备中的所述目标协议层按照SN从小到大的顺序从发送窗口中选择通过传输节点发送的初始传输数据包或重传数据包。
可选的，所述发送窗口下边界为发送设备确定丢弃的数据包中的SN和正确接收的数据包中的SN的最大值，与步长值的和；
所述发送窗口的长度为设定长度。
可选的，该方法还包括：
所述发送设备在拉窗条件满足后，对所述发送窗口进行拉窗操作；
其中，所述拉窗条件为下列中的部分或全部：
所述发送窗口下边界对应的PDU的重传禁止定时器超时；
所述发送窗口下边界对应的PDU通过N个传输节点进行重传，且重传失败，N为正整数；
所述发送窗口下边界对应的PDU传输成功。
可选的，该方法还包括：
若需要发送的数据包中包括重传数据包和初始数据包，所述发送设备优先传输重传数据包。
本发明实施例提供的一种进行数据重传的发送设备，该发送设备包括：处理模块和传输模块，所述处理模块和所述传输模块位于负责跨传输节点传输管理的目标协议层；
所述处理模块，用于在确定终端对应的传输节点满足跨传输节点重传条件后，为所述终端对应的重传数据包选择至少一个传输节点；
所述传输模块，用于通过所述处理模块选择的传输节点进行数据包重传。
可选的，所述重传数据包包括所述目标协议层对应的PDU和/或PDU分段。
可选的，所述传输模块具体用于：
将所述重传数据包发送给选择的传输节点，以使所述传输节点发送收到的重传数据包。
可选的，所述发送设备为网络侧设备；
所述处理模块还用于：
根据所述终端的能力上报信息确定所述终端支持跨传输节点重传功能后，为所述终端对应的重传数据包选择至少一个传输节点。
可选的，所述发送设备为网络侧设备；
所述处理模块还用于：
通知所述终端开启上行和/或下行跨传输节点重传功能后，为所述终端对应的重传数据包选择至少一个传输节点。
可选的，开启所述跨传输节点重传条件包括下列条件中的部分或全部：
根据收到的来自低层的状态报告确定有未发送成功的数据包；
根据收到的来自接收设备的状态报告确定有未发送成功的数据包；
根据重传判定定时器超时确定有未成功发送的数据包。
可选的，所述接收设备的状态报告是接收设备中和所述发送设备中的目标协议层对等的协议层接收到包含探寻指示的PDU后发送的；或，
所述接收设备的状态报告是所述接收设备中和所述发送设备中的目标协议层对等的协议层检测到PDU丢失后发送的；或，
所述接收设备的状态报告是所述接收设备中和所述发送设备中的目标协议层对等的协议层接收到低层发送的PDU分段丢失指示后发送的。
可选的，所述接收设备的状态报告是基于目标协议层PDU或者目标协议层PDU对应的PDU分段的。
可选的，所述处理模块具体用于：
从所述终端对应的除特定传输节点之外的其他传输节点中选择至少一个传输节点，其中所述特定传输节点为发送失败且当前链路未恢复的传输节点。
可选的，所述处理模块还用于：
在确定已进行重传的传输节点的数量未超过N后，为所述终端对应的重 传数据包选择至少一个传输节点，其中N为正整数；和/或，
在确定所述重传数据包对应的重传禁止定时器未超时后，为所述终端对应的重传数据包选择至少一个传输节点。
可选的，所述传输模块还用于：
按照SN从小到大的顺序从发送窗口中选择通过传输节点发送的初始传输数据包或重传数据包。
可选的，所述发送窗口下边界为发送设备确定丢弃的数据包中的SN和正确接收的数据包中的SN的最大值，与步长值的和；
所述发送窗口的长度为设定长度。
可选的，所述处理模块还用于：
在拉窗条件满足后，对所述发送窗口进行拉窗操作；
其中，所述拉窗条件为下列中的部分或全部：
所述发送窗口下边界对应的PDU的重传禁止定时器超时；
所述发送窗口下边界对应的PDU通过N个传输节点进行重传，且重传失败，N为正整数；
所述发送窗口下边界对应的PDU传输成功。
可选的，所述传输模块还用于：
若需要发送的数据包中包括重传数据包和初始数据包，优先传输重传数据包。
本发明实施例提供的另一种进行数据重传的发送设备包括：
位于负责跨传输节点传输管理的目标协议层的处理器，用于读取存储器中的程序，执行下列过程：
在确定终端对应的传输节点满足跨传输节点重传条件后，为所述终端对应的重传数据包选择至少一个传输节点；通过选择的传输节点进行数据包重传；
收发机，用于在处理器的控制下接收和发送数据。
本发明实施例发送设备中的负责跨传输节点传输管理的目标协议层在确 定终端对应的传输节点满足跨传输节点重传条件后，为所述终端对应的重传数据包选择至少一个传输节点；并通过选择的传输节点进行数据包重传。由于能够在确定终端对应的传输节点满足跨传输节点重传条件后，为所述终端对应的重传数据包选择至少一个传输节点，从而实现了跨不同连接的重传。
进一步的，还提高了系统传输的可靠性和吞吐量。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简要介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域的普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为背景技术中双连接的用户面架构图；
图2为本发明实施例进行数据重传的方法流程示意图；
图3为本发明实施例发送窗口示意图；
图4为本发明实施例终端进行上报及功能开启的方法流程示意图；
图5为本发明实施例发送端的架构示意图；
图6为本发明实施例接收端的架构示意图；
图7为本发明实施例与进行数据重传的发送设备结构示意图；
图8为本发明实施例另一种进行数据重传的发送设备结构示意图。
具体实施方式
为了使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明作进一步地详细描述，显然，所描述的实施例仅仅是本发明一部份实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
如图2所示，本发明实施例进行数据重传的方法包括：
步骤200、发送设备中的负责跨传输节点传输管理的目标协议层在确定终 端对应的传输节点满足跨传输节点重传条件后，为所述终端对应的重传数据包选择至少一个传输节点；
步骤201、所述发送设备中的目标协议层通过选择的传输节点进行数据包重传。
具体实施中，可以在发送设备中增加一个负责跨传输节点传输管理的目标协议层，该目标协议层在终端对应的传输节点满足跨传输节点重传条件后，为所述终端对应的重传数据包选择至少一个传输节点，通过选择的传输节点进行数据包重传。由于能够在确定终端对应的传输节点满足跨传输节点重传条件后，为所述终端对应的重传数据包选择至少一个传输节点，从而实现了跨不同连接的重传；进一步的，还可以提高系统传输的可靠性和吞吐量。
具体的，目标协议层可以是一个逻辑协议层，用软件来实现，其可以获得来自不同节点的传输状态，然后做统一判断，判断是否需要跨节点重传。当然，也可以将该功能附加于其他逻辑单元或者物理实体上，由其实现该功能，这是本领域技术人员容易理解的，下面的实施中继续以增加目标协议层的方式进行说明。
对于“确定终端对应的传输节点满足跨传输节点重传条件”，网络侧看是不同的传输载波或者网络侧的收发节点；从UE侧看就是配置的不同的传输通道，可以表征为逻辑信道或者不同的RLC实体等。
对于“为所述终端对应的重传数据包选择至少一个传输节点”，终端对应的重传数据包是指该“重传数据包”是重传至该终端或者由该终端重发的数据包。
如果发送设备是网络侧设备，则接收设备是终端；
如果发送设备是终端，则接收设备是网络侧设备。
其中，本发明实施例的网络侧设备可以是基站(比如宏基站、家庭基站等)，也可以其它网络侧设备。本发明实施例的终端可以是手机、pad等设备。
发送设备中的目标协议层在进行重传时，重传数据包可以包括目标协议层对应的PDU(Packet Data Unit，协议数据单元)；也可以包括目标协议层对 应的PDU分段；还可以包括目标协议层对应的PDU和PDU分段。
可选的，发送设备中的目标协议层通过选择的传输节点进行数据包重传具体是目标协议层将所述重传数据包发送给选择的传输节点，以使所述传输节点发送收到的重传数据包。
如果发送设备为网络侧设备，则网络侧设备中的所述目标协议层根据所述终端的能力上报信息确定所述终端支持跨传输节点重传功能后为所述终端对应的重传数据包选择至少一个传输节点。
目前现有技术中的跨节点重传可以在切换过程中发生，但是该过程涉及RRC过程，整个重传过程速度很慢。本发明实施例中的跨节点重传对应的是非RRC过程参与的底层过程。该功能的主要过程是在有多个节点同时为UE进行业务传输服务的配置下，可以提高数据传输成功率和速度。
也就是说，终端需要向网络侧上报自身是否支持跨传输节点重传功能。
如果发送设备为终端，则发送设备需要向网络侧上报自身是否支持跨传输节点重传功能。
比如可以用1bit指示终端是否支持跨传输节点重传的能力指示信息，1表示支持，0表示不支持。
如果发送设备为网络侧设备，发送设备在通知所述终端开启上行和/或下行跨传输节点重传功能后，为所述终端对应的重传数据包选择至少一个传输节点。
其中，网络侧设备可以根据终端的数据量判决是否使用多传输节点传输，当判决终端需要使用多传输节点传输时，才会针对终端是否开启跨传输节点重传功能进行判断。
判断是否开启跨传输节点重传功能需要考虑的因素包括如下之一或者组合：
终端的能力；
终端使用的多连接对应的频点；
终端的业务类型。
比如当网络侧判决终端需要使用多传输节点传输，且终端能力支持跨传输节点重传，且要传输的业务在接入层使用确认模式(AM模式)，并且其中一个传输节点对应高频点，则网络侧可以确定为终端开启跨传输节点重传功能。
如果所述发送设备为终端，则发送设备根据收到的来自网络侧设备的通知，开启上行和/或下行跨传输节点重传功能后，为所述终端对应的重传数据包选择至少一个传输节点。
可选的，本发明实施例开启所述跨传输节点重传条件可以包括下列条件中的部分或全部：
条件一、所述发送设备中的目标协议层根据收到的来自低层的状态报告确定有未发送成功的数据包；
条件二、所述发送设备中的目标协议层根据收到的来自接收设备的状态报告确定有未发送成功的数据包；
条件三、所述发送设备中的目标协议层根据重传判定定时器超时确定有未成功发送的数据包。
对于条件一，发送设备中的低层会根据PDU和/或PDU分段的发送结果生成状态报告，并向上层发送状态报告。这里的状态报告是基于目标协议层PDU或者目标协议层PDU对应的PDU分段的。比如发送的是PDU，则基于PDU生成状态报告；还比如发送的是PDU分段，则基于PDU分段生成状态报告。
状态报告包括对应的PDU和/或PDU分段是否发送成功的信息。
对于条件二，接收设备根据PDU和/或PDU分段的发送结果生成状态报告，并向发送设备发送状态报告。这里的状态报告是基于目标协议层PDU或者目标协议层PDU对应的PDU分段的。比如接收的是PDU，则基于PDU生成状态报告；还比如接收的是PDU分段，则基于PDU分段生成状态报告。
状态报告包括对应的PDU和/或PDU分段是否发送成功的信息。
可选的，所述接收设备的状态报告是接收设备中和所述发送设备中的目 标协议层对等的协议层接收到包含探寻指示的PDU后发送的；或，
所述接收设备的状态报告是所述接收设备中和所述发送设备中的目标协议层对等的协议层检测到PDU丢失后发送的；或，
所述接收设备的状态报告是所述接收设备中和所述发送设备中的目标协议层对等的协议层接收到低层发送的PDU分段丢失指示后发送的。
所述接收设备中和所述发送设备中的目标协议层对等的协议层为与发送设备的目标协议层所处的层的位置相同的协议层。
发送设备在向接收设备发送数据包后，会向接收设备发送探寻指示；
相应的，接收设备在收到包含探寻指示的PDU后，会将针对收到的数据包的状态报告返回给发送设备。
可选的，由于发送失败的传输节点的链路会出现问题，所以在进行传输时可以不从这类传输节点中选择。
具体的，所述发送设备中的目标协议层从所述终端对应的除特定传输节点之外的其他传输节点中选择至少一个传输节点，其中所述特定传输节点为发送失败且当前链路未恢复的传输节点。
这里发送设备可以根据UE的信道质量反馈结果、其他数据包的传输情况等信息判断发送失败的传输节点当前链路是否恢复。
上述除特定传输节点之外的其他传输节点可以用于进行重传也可以用于进行初始传输。
为了避免负责跨传输节点传输管理的目标协议层无限制的在不同传输节点重传，可以限制允许进行PDU重传的传输节点个数N或者为该PDU引入一个重传禁止定时器。
具体的，所述发送设备中的所述目标协议层在确定已进行重传的传输节点的数量未超过N后，为所述终端对应的重传数据包选择至少一个传输节点，其中N为正整数；和/或，
所述发送设备中的所述目标协议层在确定所述重传数据包对应的重传禁止定时器未超时后，为所述终端对应的重传数据包选择至少一个传输节点。
比如N为11，如果重传数据包A的传输节点的数量为10个，则重传数据包A还可以继续重传；如果重传数据包A的传输节点的数量为12个，则重传数据包A不能继续重传。
其中，重传禁止定时器可以在数据包初始传输后启动，也可以在数据包进行第一次重传后启动。
为了支持跨传输节点重传，发送设备中的负责跨传输节点重传的目标协议层还可以维护一个发送窗口。发送窗口维护可以采用拉窗模式(PULL模式)。
如图3所示，所述发送窗口下边界WINDOW_LOW为发送设备确定丢弃的数据包中的SN和正确接收的数据包中的SN的最大值，与步长值的和；
所述发送窗口的长度为设定长度WINDOW_LENGTH。
比如步长值为1，则发送窗口下边界WINDOW_LOW取值为发送端确认丢弃或者已经被接收端正确接收到连续的SN最大值+1。
比如丢弃的数据包中的SN为3和6，正确接收的数据包中的SN为1、2、4、5和7，则最大值SN为7，发送窗口下边界WINDOW_LOW取值为7+1＝8。
还比如丢弃的数据包中的SN为3和6，正确接收的数据包中的SN为1、2、4和5，则最大值SN为6，发送窗口下边界WINDOW_LOW取值为6+1＝7。
可选的，所述发送设备在拉窗条件满足后，对所述发送窗口进行拉窗操作；
其中，所述拉窗条件为下列中的部分或全部：
所述发送窗口下边界对应的PDU的重传禁止定时器超时；
所述发送窗口下边界对应的PDU通过N个传输节点进行重传，且重传失败，N为正整数；
所述发送窗口下边界对应的PDU传输成功。
发送窗口下边界对应的PDU为发送窗口下边界对应的数据包的PDU，比如丢弃的数据包中的SN为3和6，正确接收的数据包中的SN为1、2、4、5和7，则最大值SN为7，则发送窗口下边界对应的PDU为SN是7的数据包的PDU；还比如丢弃的数据包中的SN为3和6，正确接收的数据包中的SN 为1、2、4和5，则最大值SN为6，则发送窗口下边界对应的PDU为SN是6的数据包的PDU。
可选的，所述发送设备中的所述目标协议层按照SN从小到大的顺序从发送窗口中选择通过传输节点发送的初始传输数据包或重传数据包。
比如发送窗口中包含有3个数据包，SN分别为6、8和9，则发送SN为6的数据包。
若需要发送的数据包中包括重传数据包和初始数据包，所述发送设备优先传输重传数据包。
为了降低数据重传时延，低层的ARQ重传次数可以缩减，并且当低层ARQ达到最大次数后不触发RLF(Radio Link Failure，无线链路失败)。
下面列举几个例子对本发明的方案进行详细说明。
实施例一、如图4所示，本发明实施例终端进行上报及功能开启的方法包括：
步骤1：终端向网络侧上报终端能力。
终端上报的终端能力中携带终端是否支持跨传输节点重传的能力指示信息，比如可以用1bit指示终端是否支持跨传输节点重传的能力指示信息，1表示支持，0表示不支持。
步骤2：网络侧判决是否针对终端开启跨传输节点重传功能。
网络侧根据终端的数据量判决是否使用多传输节点传输，当判决终端需要使用多传输节点传输时，才会针对终端是否开启跨传输节点重传功能进行判断。
判断是否开启跨传输节点重传功能需要考虑的因素包括如下之一或者组合：
终端的能力；
终端使用的多连接对应的频点；
终端的业务类型。
比如当网络侧判决终端需要使用多传输节点传输，且终端能力支持跨传 输节点重传，且要传输的业务在接入层使用确认模式(AM模式)，并且其中一个传输节点对应高频点，则网络侧可以确定为终端开启跨传输节点重传功能。
可选的，网络侧可以基于上行和下行分别判断是否需要针对终端开启跨传输节点重传功能。
步骤3：如果网络侧确定需要终端开启跨传输节点重传功能，则配置终端开启跨传输节点重传功能。
一旦步骤2中网络侧确定终端需要开启跨传输节点的重传功能，则可以通过信令配置终端开启块传输节点重传功能。
可选的，网络侧可以基于上行和下行分别进行配置。
实施例2：基于本地低层反馈的状态报告触发跨传输节点重传。
步骤1：发送设备发送数据。
如图5所示，发送设备在进行数据发送时需要添加SN、头压缩和加密、数据包重复或者分段中之一或者组合操作，之后通过负责跨传输节点传输管理的目标协议层选择至少一个传输节点，将数据包发送给选择的传输节点。
每个传输节点在收到数据包后要进行ARQ、分段/串接等操作之一或者组合，并进行MAC复用，之后如果需要还会进行HARQ(Hybrid Automatic Repeat Request，混合自动重复请求)。
需要说明的是，图5给出的发送端架构只是一种可能的实现方式。只要包含负责跨传输节点传输管理的目标协议层的架构都适用本发明实施例。
当低层有传输机会时，发送设备按照SN从小到达的准则选择发送窗口内等待初传或者等待跨节点重传的PDU。以图3为例，假设当前发送窗口内SN＝WINDOW_LOW已经在传输，那么传输节点M有传输机会时，发送设备将选择SN＝WINDOW_LOW+1进行传输，并且一旦将SN为SN＝WINDOW_LOW+1的PDU递交到低层，还可以启动该PDU对应的重传禁止定时器。
步骤2：发送设备获得本地发送状态反馈。
发送设备的目标协议层接收来自低层的状态报告。
步骤3：发送设备进行跨节点重传处理。
当发送设备根据收到的来自低层的针对传输节点M传输的数据包的状态报告确定有未发送成功的数据包后，确定传输节点M未能成功发送对应的PDU或者PDU分段，并确定需要进行跨节点重传处理。
进一步的，负责跨传输节点传输管理的目标协议层输节点M存在无线链路问题，并再确认传输节点M链路恢复之前(比如基于UE的信道质量反馈结果或者其他通过该传输节点传输的其他数据包的传输情况判断传输节点M链路是否恢复)，不再通过该传输节点传输新的数据(包括初传和重传数据)。
同时，目标协议层为该重传数据包选择合适的传输节点，并通过所选择的传输节点进行数据包重传。
该方式下跨节点重传的数据包的单位为负责跨传输节点传输管理的协议层对应的PDU或者PDU分段。
可选的，发送设备对发送窗口进行维护。
一旦满足如下任何一个条件，则发送窗下边届WINDOW_LOW执行推窗操作，即WINDOW_LOW＝WINDOW_LOW+1：
所述发送窗口下边界对应的PDU的重传禁止定时器超时；
所述发送窗口下边界对应的PDU通过N个传输节点进行重传，且重传失败，N为正整数；
所述发送窗口下边界对应的PDU传输成功。
实施例3：基于接收设备的状态报告触发跨传输节点重传。
步骤1：发送设备发送数据。
如图5所示，发送设备在进行数据发送时需要添加SN、头压缩和加密、数据包重复或者分段中之一或者组合操作，之后通过负责跨传输节点传输管理的目标协议层选择至少一个传输节点，将数据包发送给选择的传输节点。
每个传输节点在收到数据包后要进行ARQ、分段/串接等操作之一或者组合，并进行MAC复用，之后如果需要还会进行HARQ。
当低层有传输机会时，发送设备按照SN从小到达的准则选择发送窗口内等待初传或者等待跨节点重传的PDU。以图3为例，假设当前发送窗口内SN＝WINDOW_LOW已经在传输，那么传输节点M有传输机会时，发送设备将选择SN＝WINDOW_LOW+1进行传输，并且一旦将SN为SN＝WINDOW_LOW+1的PDU递交到低层，还可以启动该PDU对应的重传禁止定时器。
步骤2：发送设备获得本地发送状态反馈。
发送设备的目标协议层接收来自接收设备的状态报告。
如图6所示，与传输节点对应的处理实体对通过HARQ接收到的数据进行解复用，并进行重复检测和重排序，之后进行重组。接收设备将从多个与传输节点对应的处理实体收到的数据包进行重复检测和重排序，之后进行解密和解压缩。
需要说明的是，图6给出的接收端架构只是一种可能的实现方式。只要能够接收传输节点发送的数据的架构都适用本发明实施例。
接收设备中与发送端负责跨传输节点传输管理的协议层对等的协议层执行重复检测和重排序，根据重排序结果确定接收情况，并在满足反馈触发条件后生成状态报告，并反馈给发送设备：
所述反馈触发条件包括下列中的部分或全部：
接收设备中和所述发送设备中的目标协议层对等的协议层接收到包含探寻指示的PDU；
所述接收设备中和所述发送设备中的目标协议层对等的协议层检测到PDU丢失；
所述接收设备中和所述发送设备中的目标协议层对等的协议层接收到低层发送的PDU分段丢失指示。
可选的，状态报告的内容：可以是基于PDU的状态报告，也可以是基于PDU分段的状态报告。
步骤3：发送端进行跨节点重传处理。
当发送设备根据收到的来自接收设备的针对传输节点M传输的数据包的状态报告确定有未发送成功的数据包后，确定传输节点M未能成功发送对应的PDU或者PDU分段，并确定需要进行跨节点重传处理。
进一步的，负责跨传输节点传输管理的目标协议层输节点M存在无线链路问题，并再确认传输节点M链路恢复之前(比如基于UE的信道质量反馈结果或者其他通过该传输节点传输的其他数据包的传输情况判断传输节点M链路是否恢复)，不再通过该传输节点传输新的数据(包括初传和重传数据)。
同时，目标协议层为该重传数据包选择合适的传输节点，并通过所选择的传输节点进行数据包重传。
该方式下跨节点重传的数据包的单位为负责跨传输节点传输管理的协议层对应的PDU或者PDU分段。
可选的，发送设备对发送窗口进行维护。
一旦满足如下任何一个条件，则发送窗下边届WINDOW_LOW执行推窗操作，即WINDOW_LOW＝WINDOW_LOW+1：
所述发送窗口下边界对应的PDU的重传禁止定时器超时；
所述发送窗口下边界对应的PDU通过N个传输节点进行重传，且重传失败，N为正整数；
所述发送窗口下边界对应的PDU传输成功。
基于同一发明构思，本发明实施例中还提供了一种进行数据重传的发送设备，由于该设备解决问题的原理与本发明实施例进行数据重传的方法相似，因此该设备的实施可以参见方法的实施，重复之处不再赘述。
如图7所示，本发明实施例进行数据重传的发送设备包括：处理模块700和传输模块701，所述处理模块700和所述传输模块701位于负责跨传输节点传输管理的目标协议层；
所述处理模块700，用于在确定终端对应的传输节点满足跨传输节点重传条件后，为所述终端对应的重传数据包选择至少一个传输节点；
所述传输模块701，用于通过所述处理模块选择的传输节点进行数据包重 传。
可选的，所述重传数据包包括所述目标协议层对应的PDU和/或PDU分段。
可选的，所述传输模块701体用于：
将所述重传数据包发送给选择的传输节点，以使所述传输节点发送收到的重传数据包。
可选的，所述发送设备为网络侧设备；
所述处理模块700还用于：
根据所述终端的能力上报信息确定所述终端支持跨传输节点重传功能后，为所述终端对应的重传数据包选择至少一个传输节点
可选的，所述发送设备为网络侧设备；
所述处理模块700还用于：
通知所述终端开启上行和/或下行跨传输节点重传功能后，为所述终端对应的重传数据包选择至少一个传输节点。
可选的，开启所述跨传输节点重传条件包括下列条件中的部分或全部：
根据收到的来自低层的状态报告确定有未发送成功的数据包；
根据收到的来自接收设备的状态报告确定有未发送成功的数据包；
根据重传判定定时器超时确定有未成功发送的数据包。
可选的，所述接收设备的状态报告是接收设备中和所述发送设备中的目标协议层对等的协议层接收到包含探寻指示的PDU后发送的；或，
所述接收设备的状态报告是所述接收设备中和所述发送设备中的目标协议层对等的协议层检测到PDU丢失后发送的；或，
所述接收设备的状态报告是所述接收设备中和所述发送设备中的目标协议层对等的协议层接收到低层发送的PDU分段丢失指示后发送的。
可选的，所述接收设备的状态报告是基于目标协议层PDU或者目标协议层PDU对应的PDU分段的。
可选的，所述处理模块700具体用于：
从所述终端对应的除特定传输节点之外的其他传输节点中选择至少一个传输节点，其中所述特定传输节点为发送失败且当前链路未恢复的传输节点。
可选的，所述处理模块700还用于：
在确定已进行重传的传输节点的数量未超过N后，为所述终端对应的重传数据包选择至少一个传输节点，其中N为正整数；和/或，
在确定所述重传数据包对应的重传禁止定时器未超时后，为所述终端对应的重传数据包选择至少一个传输节点。
可选的，所述传输模块701还用于：
按照SN从小到大的顺序从发送窗口中选择通过传输节点发送的初始传输数据包或重传数据包。
可选的，所述发送窗口下边界为发送设备确定丢弃的数据包中的SN和正确接收的数据包中的SN的最大值，与步长值的和；
所述发送窗口的长度为设定长度。
可选的，所述处理模块700还用于：
在拉窗条件满足后，对所述发送窗口进行拉窗操作；
其中，所述拉窗条件为下列中的部分或全部：
所述发送窗口下边界对应的PDU的重传禁止定时器超时；
所述发送窗口下边界对应的PDU通过N个传输节点进行重传，且重传失败，N为正整数；
所述发送窗口下边界对应的PDU传输成功。
可选的，所述传输模块701还用于：
若需要发送的数据包中包括重传数据包和初始数据包，优先传输重传数据包。
如图8所示，本发明实施例另一种进行数据重传的发送设备包括：
位于负责跨传输节点传输管理的目标协议层的处理器801，用于读取存储器804中的程序，执行下列过程：
在确定终端对应的传输节点满足跨传输节点重传条件后，为所述终端对 应的重传数据包选择至少一个传输节点；通过选择的传输节点进行数据包重传；
收发机802，用于在处理器801的控制下接收和发送数据。
可选的，所述重传数据包包括所述目标协议层对应的PDU和/或PDU分段。
可选的，所述处理器801体用于：
将所述重传数据包发送给选择的传输节点，以使所述传输节点发送收到的重传数据包。
可选的，所述发送设备为网络侧设备；
所述处理器801还用于：
根据所述终端的能力上报信息确定所述终端支持跨传输节点重传功能后，为所述终端对应的重传数据包选择至少一个传输节点。
可选的，所述发送设备为网络侧设备；
所述处理器801还用于：
通知所述终端开启上行和/或下行跨传输节点重传功能后，为所述终端对应的重传数据包选择至少一个传输节点。
可选的，开启所述跨传输节点重传条件包括下列条件中的部分或全部：
根据收到的来自低层的状态报告确定有未发送成功的数据包；
根据收到的来自接收设备的状态报告确定有未发送成功的数据包；
根据重传判定定时器超时确定有未成功发送的数据包。
可选的，所述接收设备的状态报告是接收设备中和所述发送设备中的目标协议层对等的协议层接收到包含探寻指示的PDU后发送的；或，
所述接收设备的状态报告是所述接收设备中和所述发送设备中的目标协议层对等的协议层检测到PDU丢失后发送的；或，
所述接收设备的状态报告是所述接收设备中和所述发送设备中的目标协议层对等的协议层接收到低层发送的PDU分段丢失指示后发送的。
可选的，所述接收设备的状态报告是基于目标协议层PDU或者目标协议 层PDU对应的PDU分段的。
可选的，所述处理器801具体用于：
从所述终端对应的除特定传输节点之外的其他传输节点中选择至少一个传输节点，其中所述特定传输节点为发送失败且当前链路未恢复的传输节点。
可选的，所述处理器801还用于：
在确定已进行重传的传输节点的数量未超过N后，为所述终端对应的重传数据包选择至少一个传输节点，其中N为正整数；和/或，
在确定所述重传数据包对应的重传禁止定时器未超时后，为所述终端对应的重传数据包选择至少一个传输节点。
可选的，所述处理器801还用于：
按照SN从小到大的顺序从发送窗口中选择通过传输节点发送的初始传输数据包或重传数据包。
可选的，所述发送窗口下边界为发送设备确定丢弃的数据包中的SN和正确接收的数据包中的SN的最大值，与步长值的和；
所述发送窗口的长度为设定长度。
可选的，所述处理器801还用于：
在拉窗条件满足后，对所述发送窗口进行拉窗操作；
其中，所述拉窗条件为下列中的部分或全部：
所述发送窗口下边界对应的PDU的重传禁止定时器超时；
所述发送窗口下边界对应的PDU通过N个传输节点进行重传，且重传失败，N为正整数；
所述发送窗口下边界对应的PDU传输成功。
可选的，所述处理器801还用于：
若需要发送的数据包中包括重传数据包和初始数据包，优先传输重传数据包。
在图8中，总线架构(用总线800来代表)，总线800可以包括任意数量的互联的总线和桥，总线800将包括由处理器801代表的一个或多个处理器 和存储器804代表的存储器的各种电路链接在一起。总线800还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口803在总线800和收发机802之间提供接口。收发机802可以是一个元件，也可以是多个元件，比如多个接收器和发送器，提供用于在传输介质上与各种其他装置通信的单元。经处理器801处理的数据通过天线805在无线介质上进行传输，进一步，天线805还接收数据并将数据传送给处理器801。
处理器801负责管理总线800和通常的处理，还可以提供各种功能，包括定时，外围接口，电压调节、电源管理以及其他控制功能。而存储器804可以被用于存储处理器801在执行操作时所使用的数据。
可选的，处理器801可以是CPU(中央处埋器)、ASIC(Application Specific Integrated Circuit，专用集成电路)、FPGA(Field－Programmable Gate Array，现场可编程门阵列)或CPLD(Complex Programmable Logic Device，复杂可编程逻辑器件)。
以上参照示出根据本申请实施例的方法、装置(系统)和/或计算机程序产品的框图和/或流程图描述本申请。应理解，可以通过计算机程序指令来实现框图和/或流程图示图的一个块以及框图和/或流程图示图的块的组合。可以将这些计算机程序指令提供给通用计算机、专用计算机的处理器和/或其它可编程数据处理装置，以产生机器，使得经由计算机处理器和/或其它可编程数据处理装置执行的指令创建用于实现框图和/或流程图块中所指定的功能/动作的方法。
相应地，还可以用硬件和/或软件(包括固件、驻留软件、微码等)来实施本申请。更进一步地，本申请可以采取计算机可使用或计算机可读存储介质上的计算机程序产品的形式，其具有在介质中实现的计算机可使用或计算机可读程序代码，以由指令执行系统来使用或结合指令执行系统而使用。在本申请上下文中，计算机可使用或计算机可读介质可以是任意介质，其可以包含、存储、通信、传输、或传送程序，以由指令执行系统、装置或设备使 用，或结合指令执行系统、装置或设备使用。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (29)

  1. 一种进行数据重传的方法，其特征在于，该方法包括：
    发送设备中的负责跨传输节点传输管理的目标协议层在确定终端对应的传输节点满足跨传输节点重传条件后，为所述终端对应的重传数据包选择至少一个传输节点；
    所述发送设备中的目标协议层通过选择的传输节点进行数据包重传。
  2. 如权利要求1所述的方法，其特征在于，所述重传数据包包括所述目标协议层对应的协议数据单元PDU和/或PDU分段。
  3. 如权利要求1所述的方法，其特征在于，所述发送设备中的目标协议层通过选择的传输节点进行数据包重传，包括：
    所述发送设备中的目标协议层将所述重传数据包发送给选择的传输节点，以使所述传输节点发送收到的重传数据包。
  4. 如权利要求1所述的方法，其特征在于，所述发送设备为网络侧设备；
    所述发送设备中的所述目标协议层为所述终端对应的重传数据包选择至少一个传输节点之前，还包括：
    所述发送设备中的所述目标协议层根据所述终端的能力上报信息确定所述终端支持跨传输节点重传功能。
  5. 如权利要求1所述的方法，其特征在于，所述发送设备为网络侧设备；
    所述发送设备中的所述目标协议层为所述终端对应的重传数据包选择至少一个传输节点之前，还包括：
    所述发送设备通知所述终端开启上行和/或下行跨传输节点重传功能。
  6. 如权利要求1所述的方法，其特征在于，开启所述跨传输节点重传条件包括下列条件中的部分或全部：
    所述发送设备中的目标协议层根据收到的来自低层的状态报告确定有未发送成功的数据包；
    所述发送设备中的目标协议层根据收到的来自接收设备的状态报告确定 有未发送成功的数据包；
    所述发送设备中的目标协议层根据重传判定定时器超时确定有未成功发送的数据包。
  7. 如权利要求6所述的方法，其特征在于，所述接收设备的状态报告是接收设备中和所述发送设备中的目标协议层对等的协议层接收到包含探寻指示的PDU后发送的；或，
    所述接收设备的状态报告是所述接收设备中和所述发送设备中的目标协议层对等的协议层检测到PDU丢失后发送的；或，
    所述接收设备的状态报告是所述接收设备中和所述发送设备中的目标协议层对等的协议层接收到低层发送的PDU分段丢失指示后发送的。
  8. 如权利要求6或7所述的方法，其特征在于，所述接收设备的状态报告是基于目标协议层PDU或者目标协议层PDU对应的PDU分段的。
  9. 如权利要求1所述的方法，其特征在于，所述发送设备中的目标协议层为所述终端对应的重传数据包选择至少一个传输节点，包括：
    所述发送设备中的目标协议层从所述终端对应的除特定传输节点之外的其他传输节点中选择至少一个传输节点，其中所述特定传输节点为发送失败且当前链路未恢复的传输节点。
  10. 如权利要求1所述的方法，其特征在于，所述发送设备中的所述目标协议层为所述终端对应的重传数据包选择至少一个传输节点之前，还包括：
    所述发送设备中的所述目标协议层确定已进行重传的传输节点的数量未超过N，其中N为正整数；和/或，
    所述发送设备中的所述目标协议层确定所述重传数据包对应的重传禁止定时器未超时。
  11. 如权利要求1所述的方法，其特征在于，该方法还包括：
    所述发送设备中的所述目标协议层按照SN从小到大的顺序从发送窗口中选择通过传输节点发送的初始传输数据包或重传数据包。
  12. 如权利要求11所述的方法，其特征在于，所述发送窗口下边界为发 送设备确定丢弃的数据包中的SN和正确接收的数据包中的SN的最大值，与步长值的和；
    所述发送窗口的长度为设定长度。
  13. 如权利要求12所述的方法，其特征在于，该方法还包括：
    所述发送设备在拉窗条件满足后，对所述发送窗口进行拉窗操作；
    其中，所述拉窗条件为下列中的部分或全部：
    所述发送窗口下边界对应的PDU的重传禁止定时器超时；
    所述发送窗口下边界对应的PDU通过N个传输节点进行重传，且重传失败，N为正整数；
    所述发送窗口下边界对应的PDU传输成功。
  14. 如权利要求1～7、9～13任一所述的方法，其特征在于，该方法还包括：
    若需要发送的数据包中包括重传数据包和初始数据包，所述发送设备优先传输重传数据包。
  15. 一种进行数据重传的发送设备，其特征在于，该发送设备包括：处理模块和传输模块，所述处理模块和所述传输模块位于负责跨传输节点传输管理的目标协议层；
    所述处理模块，用于在确定终端对应的传输节点满足跨传输节点重传条件后，为所述终端对应的重传数据包选择至少一个传输节点；
    所述传输模块，用于通过所述处理模块选择的传输节点进行数据包重传。
  16. 如权利要求15所述的发送设备，其特征在于，所述重传数据包包括所述目标协议层对应的PDU和/或PDU分段。
  17. 如权利要求15所述的发送设备，其特征在于，所述传输模块具体用于：
    将所述重传数据包发送给选择的传输节点，以使所述传输节点发送收到的重传数据包。
  18. 如权利要求15所述的发送设备，其特征在于，所述发送设备为网络 侧设备；
    所述处理模块还用于：
    根据所述终端的能力上报信息确定所述终端支持跨传输节点重传功能后，为所述终端对应的重传数据包选择至少一个传输节点。
  19. 如权利要求15所述的发送设备，其特征在于，所述发送设备为网络侧设备；
    所述处理模块还用于：
    通知所述终端开启上行和/或下行跨传输节点重传功能后，为所述终端对应的重传数据包选择至少一个传输节点。
  20. 如权利要求15所述的发送设备，其特征在于，开启所述跨传输节点重传条件包括下列条件中的部分或全部：
    根据收到的来自低层的状态报告确定有未发送成功的数据包；
    根据收到的来自接收设备的状态报告确定有未发送成功的数据包；
    根据重传判定定时器超时确定有未成功发送的数据包。
  21. 如权利要求20所述的发送设备，其特征在于，所述接收设备的状态报告是接收设备中和所述发送设备中的目标协议层对等的协议层接收到包含探寻指示的PDU后发送的；或，
    所述接收设备的状态报告是所述接收设备中和所述发送设备中的目标协议层对等的协议层检测到PDU丢失后发送的；或，
    所述接收设备的状态报告是所述接收设备中和所述发送设备中的目标协议层对等的协议层接收到低层发送的PDU分段丢失指示后发送的。
  22. 如权利要求20或21所述的发送设备，其特征在于，所述接收设备的状态报告是基于目标协议层PDU或者目标协议层PDU对应的PDU分段的。
  23. 如权利要求15所述的发送设备，其特征在于，所述处理模块具体用于：
    从所述终端对应的除特定传输节点之外的其他传输节点中选择至少一个传输节点，其中所述特定传输节点为发送失败且当前链路未恢复的传输节点。
  24. 如权利要求15所述的发送设备，其特征在于，所述处理模块还用于：
    在确定已进行重传的传输节点的数量未超过N后，为所述终端对应的重传数据包选择至少一个传输节点，其中N为正整数；和/或，
    在确定所述重传数据包对应的重传禁止定时器未超时后，为所述终端对应的重传数据包选择至少一个传输节点。
  25. 如权利要求15所述的发送设备，其特征在于，所述传输模块还用于：
    按照SN从小到大的顺序从发送窗口中选择通过传输节点发送的初始传输数据包或重传数据包。
  26. 如权利要求25所述的发送设备，其特征在于，所述发送窗口下边界为发送设备确定丢弃的数据包中的SN和正确接收的数据包中的SN的最大值，与步长值的和；
    所述发送窗口的长度为设定长度。
  27. 如权利要求26所述的发送设备，其特征在于，所述处理模块还用于：
    在拉窗条件满足后，对所述发送窗口进行拉窗操作；
    其中，所述拉窗条件为下列中的部分或全部：
    所述发送窗口下边界对应的PDU的重传禁止定时器超时；
    所述发送窗口下边界对应的PDU通过N个传输节点进行重传，且重传失败，N为正整数；
    所述发送窗口下边界对应的PDU传输成功。
  28. 如权利要求15～21、22～27任一所述的发送设备，其特征在于，所述传输模块还用于：
    若需要发送的数据包中包括重传数据包和初始数据包，优先传输重传数据包。
  29. 一种进行数据重传的发送设备，其特征在于，包括：
    位于负责跨传输节点传输管理的目标协议层的处理器，用于读取存储器中的程序，执行下列过程：
    在确定终端对应的传输节点满足跨传输节点重传条件后，为所述终端对 应的重传数据包选择至少一个传输节点；通过选择的传输节点进行数据包重传；
    收发机，用于在处理器的控制下接收和发送数据。
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