WO2015127670A1 - 一种数据重传的方法和装置 - Google Patents

一种数据重传的方法和装置 Download PDF

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Publication number
WO2015127670A1
WO2015127670A1 PCT/CN2014/072753 CN2014072753W WO2015127670A1 WO 2015127670 A1 WO2015127670 A1 WO 2015127670A1 CN 2014072753 W CN2014072753 W CN 2014072753W WO 2015127670 A1 WO2015127670 A1 WO 2015127670A1
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WIPO (PCT)
Prior art keywords
data unit
link
data
sequence number
received
Prior art date
Application number
PCT/CN2014/072753
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English (en)
French (fr)
Inventor
曾清海
张健
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201480002802.4A priority Critical patent/CN105379342B/zh
Priority to PCT/CN2014/072753 priority patent/WO2015127670A1/zh
Priority to EP14883711.5A priority patent/EP3104641A4/en
Priority to KR1020167026398A priority patent/KR101881969B1/ko
Publication of WO2015127670A1 publication Critical patent/WO2015127670A1/zh
Priority to US15/248,458 priority patent/US20160366008A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06Management of faults, events, alarms or notifications
    • H04L41/0654Management of faults, events, alarms or notifications using network fault recovery
    • H04L41/0668Management of faults, events, alarms or notifications using network fault recovery by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1825Adaptation of specific ARQ protocol parameters according to transmission conditions
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829Arrangements specially adapted for the receiver end
    • H04L1/1832Details of sliding window management
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • H04L1/187Details of sliding window management
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • H04L1/1893Physical mapping arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00Arrangements for monitoring or testing data switching networks
    • H04L43/06Generation of reports
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/1607Details of the supervisory signal
    • H04L1/1685Details of the supervisory signal the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • H04L1/188Time-out mechanisms

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and apparatus for data retransmission. Background technique
  • the same terminal can communicate with multiple base stations simultaneously or in a time-sharing manner, wherein the plurality of base stations include one primary base station and at least one secondary base station.
  • the downlink data sent by the primary base station and the at least one secondary base station to the terminal at the same time or in a time-sharing manner is offloaded by the PDCP (Packet Data Convergence Protocol) layer of the primary base station, that is, the primary base station needs to transmit data to the terminal.
  • the data received by the terminal from different base stations is aggregated at the PDCP layer of the terminal; the data uplinked by the terminal to the base station is offloaded by the PDCP layer of the terminal, and the data received by the primary base station from the terminal and
  • the data received from the secondary base station is aggregated at the PDCP layer of the primary base station.
  • the PDCP layer supports the reordering function, so that when the data is aggregated, the data is delivered to the upper layer in an orderly manner.
  • both the downlink and the uplink may have a situation in which the overall transmission efficiency is affected by a problem of one base station.
  • the condition of the wireless network signal of the base station in question is poor, the chance of retransmission failure is also large, and the base station in question is constantly heavy. Transmission not only wastes bandwidth, but also increases latency, affecting the total data transmission rate of the terminal. Summary of the invention
  • the invention provides a method and device for data retransmission, which can improve the efficiency of data retransmission and reduce the retransmission delay.
  • the present invention uses the following technical solutions:
  • the first aspect provides a shunt device, including:
  • a sending unit configured to send data to the convergence device through the first link
  • An indicating unit configured to indicate that the first link stops transmitting, to the sink device, a data unit that is not received by the sink device; the data includes the data unit; and the sending unit is further configured to: The second link retransmits the data unit to the sink device.
  • the distribution device further includes a determining unit, configured to determine a sequence number of the data unit to be confirmed in the data, and a data to be sent in the branch device The serial number of the unit;
  • the distribution device further includes a determining unit, configured to determine a time when the serial number of the data unit to be confirmed in the data does not update;
  • the data unit corresponding to the sequence number of the to-be-confirmed data unit is the data unit not received by the convergence device .
  • the offloading device further includes a receiving unit, configured to receive a status report sent by the convergence device, where the status report includes the convergence device The indication information of the serial number of the data unit not received in the data;
  • the distribution device further includes a determining unit, configured to determine, according to the indication information, the data unit that is not received by the convergence device.
  • the sending unit is further configured to: perform wireless to the first link
  • the link control RL C layer sends a handover link message, where the handover link message includes an indication of a maximum sequence number of all sequence numbers of the data unit And the RL C layer stops transmitting the data unit corresponding to the maximum sequence number and the data unit whose sequence number is smaller than the maximum sequence number according to the indication information of the maximum sequence number.
  • the processing unit is configured to: adjust a state variable in a sending window of the RL C layer of the first link, where the state variable in the sending window includes a sequence number and a location of a next to-be-confirmed data unit in the data The serial number of the next data unit to be transmitted in the data;
  • the indication unit is further configured to: instruct the first link to adjust a state variable in a receiving window of the RL C layer of the first link.
  • the offloading device further includes a processing unit, if the first link is The RL C layer uses a non-acknowledgment mode, and the processing unit is configured to: adjust a state variable in a sending window of the RLC layer of the first link, where the state variable in the sending window includes the next in the data The serial number of a data unit to be transmitted.
  • the distribution device further includes a receiving unit, configured to receive the first link failure a message, where the first link failure message includes a first link failure message sent by the aggregation device or a first link failure message sent by the sending device corresponding to the first link;
  • the offloading device further includes a processing unit, configured to initiate a first link deletion process according to the first link failure message received by the receiving unit.
  • the data unit is a packet data convergence P DC P protocol data unit.
  • the second aspect provides a convergence end device, including: a sending unit, configured to send, to the distribution device, a status report indicating that the data unit is not received by the convergence device, so that the distribution device indicates that the first link stops transmitting to the aggregation device according to the status report The data unit, and retransmitting the data unit to the convergence device through a second link;
  • the status report includes indication information of a sequence number of the data unit, and the data sent by the distribution device to the aggregation device through the first link includes the data unit.
  • the convergence end device further includes a determining unit, configured to determine a sequence number of the data unit to be received in the data, and a data unit that the convergence end device has received Maximum serial number;
  • the convergence end device further includes a determining unit, configured to determine a time when the serial number of the data unit to be received in the data does not update;
  • the data unit corresponding to the sequence number of the to-be-received data unit is the data unit not received by the convergence device .
  • the convergence device further includes a processing unit, configured to adjust the first chain a state variable in a receiving window of the RL C layer of the path, the state variable in the receiving window including a sequence number of a next data unit to be received in the data and a maximum sequence number of the received data unit in the data .
  • the offloading device further includes an indication unit, configured to indicate that the first link adjusts an RL C layer of the first link The status variable in the send window.
  • the sending unit is further configured to send a first link failure message to the offloading device, so that the offloading device reports according to the status and the first The link failure message initiates the first link deletion process.
  • the data unit includes a P DC P protocol data unit.
  • the third aspect provides a base station, where the base station includes the offloading device according to any one of the possible implementations of the first aspect to the eighth possible implementation manner; or the base station includes the second aspect to the sixth A convergence end device as described in any of the possible implementations of the possible implementations.
  • the fourth aspect provides a terminal, where the terminal includes the offloading device according to any one of the possible implementations of the first aspect to the eighth possible implementation manner; or the terminal includes the second aspect to the sixth A convergence end device as described in any of the possible implementations of the possible implementations.
  • the fifth aspect provides a data retransmission method, including:
  • the distribution device transmits data to the convergence device through the first link
  • the distribution end device instructs the first link to stop transmitting, to the convergence end device, a data unit not received by the convergence end device, the data includes the data unit; and the distribution end device passes the second chain The path retransmits the data unit to the sink device.
  • the method further includes:
  • the method further includes: determining a time when the serial number of the to-be-confirmed data unit in the data is not updated;
  • the data unit corresponding to the sequence number of the to-be-confirmed data unit is the data unit not received by the convergence device .
  • the method further includes: receiving a status report sent by the aggregation device, where the status report includes a data unit that is not received by the convergence device in the data.
  • the indication of the serial number is not received by the convergence device in the data.
  • the indicating that the first link stops transmitting the The data units not received by the aggregation device include:
  • a handover link message Transmitting, to the RL C layer of the first link, a handover link message, where the handover link message includes indication information of a maximum sequence number of all sequence numbers of the data unit, so that the RLC layer is configured according to the maximum
  • the indication information of the serial number stops transmitting the data unit corresponding to the maximum sequence number and the data unit whose sequence number is smaller than the maximum sequence number.
  • the method further Includes:
  • the state variable in the transmission window including a sequence number of a next to-be-confirmed data unit in the data and a next one in the data Send the serial number of the data unit;
  • the method further includes:
  • a state variable in the transmit window includes a sequence number of a next data unit to be transmitted in the data.
  • the method further includes: receiving a first link failure message; The link failure message initiates the first link deletion process.
  • the data unit is a P DC P protocol data unit.
  • a sixth aspect provides a data retransmission method, including:
  • the convergence device sends a status report to the distribution device indicating that the data unit is not received by the aggregation device, so that the distribution device instructs the first link to stop transmitting the information to the convergence device according to the status report. a data unit, and retransmitting the data unit to the convergence device via a second link;
  • the status report includes indication information of a sequence number of the data unit, and the data sent by the distribution device to the aggregation device through the first link includes the data unit.
  • the method further includes:
  • the method further includes: determining, when the sequence number of the data unit to be received in the data is not updated; Determining, when the time when the sequence number of the to-be-received data unit is not updated, the data unit corresponding to the sequence number of the to-be-received data unit is the data unit not received by the convergence device .
  • the method further includes:
  • the method further includes:
  • the method further includes:
  • the data unit includes a P DC P protocol data unit.
  • the distribution device transmits data to the convergence device through the first link, and when it is determined that the data unit is not received by the convergence device, the distribution device indicates that the first link is stopped. Transmitting, to the sink device, a data unit not received by the sink device, and retransmitting the data unit to the sink device through the second link.
  • the branching device can transmit the data unit that is not sent to the aggregation device in the first link by using the second link with a higher transmission rate. Improve the efficiency of data retransmission and reduce the retransmission delay.
  • FIG. 1 is a schematic structural diagram of a power distribution device according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a convergence terminal device according to an embodiment of the present invention
  • FIG. 3 is another schematic diagram of a power distribution terminal according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of another convergence end device according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention
  • Figure 5b is a schematic structural diagram of another base station according to an embodiment of the present invention
  • Figure 6b is a schematic structural diagram of another base station according to an embodiment of the present invention
  • Figure 6b is another base station according to an embodiment of the present invention
  • FIG. 7 is a schematic structural diagram of a terminal according to an embodiment of the present invention
  • Figure 7b is a schematic structural diagram of another terminal according to an embodiment of the present invention
  • Figure 8b is a schematic structural diagram of another terminal according to an embodiment of the present invention
  • Figure 8b is another terminal provided by an embodiment of the present invention
  • FIG. 9 is a schematic flowchart diagram of a method for data retransmission according to an embodiment of the present invention
  • FIG. 10 is a schematic structural diagram of a system for a terminal to communicate with a plurality of base stations according to an embodiment of the present invention
  • FIG. 1 is a schematic flowchart of another method for data retransmission according to an embodiment of the present invention
  • FIG. 12 is a schematic flowchart of another method for data retransmission according to an embodiment of the present invention.
  • FIG. 13 is a schematic flowchart of another method for data retransmission provided by an embodiment of the present invention.
  • the embodiment of the present invention provides a shunt device 10, as shown in FIG. 1, the shunt device 10 includes:
  • the sending unit 1 1 is configured to send data to the convergence device through the first link.
  • the indicating unit 1 2 is configured to indicate that the first link stops transmitting, to the sink device, a data unit that is not received by the sink device.
  • the data includes the data unit.
  • the sending unit 1 is further configured to retransmit the data unit to the convergence device through the second link.
  • the distribution device when the distribution device sends data to the aggregation device, the distribution device diverts the data through the PDCP layer of the distribution device, and the distribution device passes the diverted data through different links. Send to the aggregation device.
  • the offloading device is a primary base station, and the convergence end device is a terminal.
  • the system in which the terminal communicates with multiple base stations includes a primary base station, at least one secondary base station, and a terminal, and when the primary base station and the secondary base station simultaneously or time-divisionally transmit data to the terminal, the primary base station passes the data.
  • the PDC layer of the primary base station performs offloading, and the split data is aggregated at the PDCP layer of the terminal.
  • the split end device is the primary base station, and the convergence end device is the terminal.
  • the primary base station sends the offloaded data to the terminal through the different links
  • the first link may be the secondary base station, and the secondary base station sends the offloaded data to the terminal.
  • the link may also be a link that the primary base station sends the offloaded data to the terminal.
  • the offloading device is a terminal
  • the convergence end device is a primary base station.
  • the terminal when the terminal transmits data to the base station, the data is shunted by the PDC layer of the terminal, and is aggregated at the PDCP layer of the primary base station, where the traffic is split.
  • the end device is the terminal, and the convergence end is installed
  • the first link may be the link that passes through the secondary base station, and the secondary base station sends the offloaded data to the primary base station, and the first link may also be after the terminal is to be offloaded.
  • the data is sent to the link of the primary base station.
  • the data unit that is not received by the aggregation device in the embodiment of the present invention is a data unit that needs to switch the link transmission; if the first link has a retransmission The mechanism, that is, the data that is not received by the sink device, the first link is retransmitted. In this case, the data unit not received by the sink device described in the embodiment of the present invention does not include the offload. The end device considers that it is necessary to continue the data unit retransmitted through the first link.
  • the branching device further includes a determining unit 13 configured to determine a sequence number of the data unit to be confirmed in the data and a sequence number of the data unit to be transmitted in the branching device, if the data unit to be confirmed is The interval between the sequence number and the sequence number of the to-be-sent data unit meets a preset difference condition, and then determines that the data unit corresponding to the sequence number of the to-be-confirmed data unit is the data unit that is not received by the convergence device.
  • a determining unit 13 configured to determine a sequence number of the data unit to be confirmed in the data and a sequence number of the data unit to be transmitted in the branching device, if the data unit to be confirmed is The interval between the sequence number and the sequence number of the to-be-sent data unit meets a preset difference condition, and then determines that the data unit corresponding to the sequence number of the to-be-confirmed data unit is the data unit that is not received by the convergence device.
  • the transmission window of the PDCP layer of the branching device includes a state variable VTs and a state variable VTa, where VTs represents the sequence number of the next data unit to be transmitted, and VTa represents the next data unit that is expected to receive the acknowledgment. Serial number.
  • the offloading device presets a threshold of a difference between VTs and VTa in a transmission window of a PDCP layer of the offloading device, if VTs and VTa in the sending window When the difference reaches the threshold, the branching device determines that the data unit corresponding to the VTa is a data unit that needs to switch the link transmission.
  • the branching device may also preset a threshold of a difference between VTs and VTa in a transmission window of the RLC layer of the branching device, if the RLC layer The difference between VTs and VTa in the transmission window reaches the threshold, and the branching device determines that the data unit corresponding to the VTa is a data unit that needs to be switched for link transmission.
  • the determining unit 13 is further configured to: determine, when the sequence number of the to-be-confirmed data unit in the data does not update, when the time when the sequence number of the to-be-confirmed data unit does not update meets the preset time threshold , determining the sequence of the data unit to be confirmed
  • the data unit corresponding to the number is a data unit that is not received by the sink device.
  • the branching device sets a corresponding timer for VTa in the transmission window of the PDCP layer in the branching device, and the timer sets a time threshold. After the VTa is updated, the timer starts or restarts to start timing. When the timer reaches the time threshold, if the VTa has not been updated, the branch device determines that the data unit corresponding to the VTa needs to be switched. The data unit of the transfer.
  • the sending window may also be the sending window of the RLC layer of the offloading device.
  • the distribution device further includes a receiving unit 14 configured to receive a status report sent by the aggregation device, where the status report includes indication information of a sequence number of the data unit not received by the convergence device in the data.
  • the determining unit 13 is further configured to determine, according to the indication information, the data unit that is not received by the convergence device.
  • the status report may be a PDCP status report, where the data unit is a PDCP protocol data unit, where the PDCP status report may be sent as a special MAC control unit in the air interface.
  • the PDCP status report may be triggered by the aggregation end device or the first link sender after the secondary base station radio link fails. At this time, the off-slot device will receive an indication message that the secondary base station radio link has failed. After receiving the failure indication message, the distribution device triggers the secondary base station deletion process.
  • the offloading end device may send a PDCP polling request message to the sinking end device, and receive a PDCP status report sent by the sinking end device according to the PDCP polling request message; the shunting end device may also receive the converging end device Self-triggered PDCP status report.
  • the receiving window of the PDCP layer of the convergence device includes a state variable VRr and a state variable VRh, wherein the VRr represents a sequence number of a next desired data unit, and the VRh represents a maximum sequence number in the received data unit. The next serial number.
  • the aggregation device may determine that the data unit corresponding to the VRr is a data unit that needs to be switched by the link when the difference between the VRr and the VRh in the receiving window meets the preset difference threshold; the convergence device may also At the time when the VRr has not been updated When the preset time threshold is sufficient, it is determined that the data unit corresponding to the VRr is a data unit that needs to switch the link transmission. And transmitting, by the PDCP status report, the sequence number of the data unit that needs to be switched by the link transmission to the branching device.
  • the first link is instructed to stop transmitting the data unit.
  • the sending unit 11 is further configured to send, to the RLC layer of the first link, a handover link message, where the handover link message includes indication information of a maximum sequence number of all sequence numbers of the data unit, so that The RLC layer stops transmitting the data unit corresponding to the maximum sequence number and the data unit whose sequence number is smaller than the maximum sequence number according to the indication information of the maximum sequence number.
  • the branch device needs to switch the data unit of the link transmission after determining the data transmitted by the first link.
  • the end device stops transmitting the PDCP protocol data unit corresponding to the maximum sequence number and the PDCP protocol data unit whose sequence number is smaller than the maximum sequence number, and if the PDCP layer has delivered the data unit to the RLC layer, sending a handover link message to the The RLC layer, the switch link message includes a maximum sequence number of all sequence numbers of the data unit, so that the RLC layer stops transmitting the RLC protocol data unit corresponding to the maximum sequence number according to the switch link message, and the sequence number is smaller than the maximum The RLC protocol data unit of the serial number.
  • the offloading device further includes a processing unit 15 configured to adjust a transmission window of the RLC layer of the first link if the RLC layer of the first link uses a non-acknowledgment mode State variable.
  • the state variable in the transmission window includes the sequence number of the next data unit to be transmitted in the data.
  • the VTs in the transmission window of the RLC layer is 5 before the first end link stops transmitting the data unit, and if all the data units of the link transmission need to be switched in the first link,
  • the maximum sequence number in the sequence number is 5, and after the branch device indicates that the first link stops transmitting the data unit, the RLC layer stops transmitting all data units whose sequence number is less than or equal to 5, so the RLC layer Under A data unit to be transmitted is a data unit whose sequence number is greater than 5, such as a data unit with sequence number 8.
  • the branch device indicates that the RLC layer updates the VTs in the transmission window from 5 to 8.
  • the processing unit 15 is further configured to: if the RLC layer of the first link uses an acknowledge mode, adjust a state variable in a sending window of the RLC layer in the first link, and the indicating unit 12 further uses And indicating that the first link adjusts a state variable in a receiving window of the RLC layer of the first link.
  • the state variable in the transmission window includes a sequence number of a next to-be-confirmed data unit in the data and a sequence number of a next to-be-sent data unit in the data.
  • the RLC layer in the first link includes a transmitting end and a receiving end.
  • the acknowledgment mode after the sending end of the RLC layer sends data to the receiving end, the receiving end may request the receiving end to correctly receive the feedback. Therefore, the sequence number of the next to-be-confirmed data unit in the transmission window of the RLC layer corresponds to the sequence number of the next desired data unit in the RLC layer reception window, and the branch device adjusts the RLC.
  • the RLC control message is sent to the receiving end, and the receiving end instructs the receiving end to perform corresponding adjustment on the receiving window of the RLC layer according to the RLC control message. In order for the offloading device to continue to transmit data other than the data unit requiring the switching link transmission to the sinking end device through the first link.
  • the receiving unit 14 is further configured to: receive a first link failure message, where the processing unit 15 is further configured to initiate a first link deletion process according to the first link failure message.
  • the first link failure message includes a first link failure message sent by the aggregation device or a first link failure message sent by the sending device corresponding to the first link.
  • the offloading device stops sending data to the aggregation device through the first link, and sends the data to the aggregation.
  • the data unit switching link of the end device is retransmitted to the sink device. If the first link does not pass through the secondary base station, the first link failure message is sent by the terminal aggregation device, and if the first link passes the secondary base station, the first link is lost.
  • the defeat message may be sent by the aggregation device or may be sent by the secondary base station.
  • the shunt device transmits data to the sink device through the first link, and when it is determined that the data unit not received by the sink device exists in the data, the shunt device indicates the first The link stops transmitting the data unit not received by the sink device to the sink device, and retransmits the data unit to the sink device through the second link.
  • the branching device can transmit the data unit that is not sent to the aggregation device in the first link by using the second link with a higher transmission rate. Improve the efficiency of data retransmission and reduce the retransmission delay.
  • the embodiment of the present invention provides a convergence end device 20, as shown in FIG. 2, the convergence end device 20 includes:
  • the sending unit 2 1 is configured to send, to the distribution device, a status report indicating that the data unit is not received by the aggregation device, so that the distribution device indicates that the first link stops transmitting the data to the aggregation device according to the status report. And retransmitting the data unit to the sink device via the second link.
  • the status report includes indication information of a sequence number of the data unit, and the data sent by the distribution device to the aggregation device through the first link includes the data unit.
  • the offloading device sends data to the sinking device through the first link, and the shunt device diverts the data through the PDCP layer of the shunt device, and the shunt device passes the shunted data through different The link is sent to the sink device.
  • the offloading device is a primary base station, and the convergence end device is a terminal.
  • the system in which the terminal communicates with multiple base stations includes a primary base station, at least one secondary base station, and a terminal, and when the primary base station and the secondary base station simultaneously or time-divisionally transmit data to the terminal, the primary base station passes the data.
  • the P DC P layer of the primary base station performs offloading, and the split data is aggregated at the P DC P layer of the terminal.
  • the split end device is the primary base station, and the convergence end device is the terminal.
  • the primary base station divides the diverted data through different links.
  • the first link may be a link that passes through the secondary base station, and the secondary base station sends the offloaded data to the terminal, and the first link may also be split by the primary base station. The link that the data is sent to the terminal.
  • the offloading device is a terminal
  • the convergence end device is a primary base station.
  • the terminal when the terminal uplinks data to the base station, the data is split by the P DC P layer of the terminal, and is aggregated at the P DC P layer of the primary base station, where
  • the branching device is the terminal
  • the sinking device is the primary base station
  • the first link may be a link that passes through the secondary base station, and the secondary base station sends the offloaded data to the primary base station.
  • the first link may also be a link that the terminal transmits the offloaded data to the primary base station.
  • the convergence device determines a data unit not received by the convergence device before transmitting the status report to the distribution device.
  • the data unit that is not received by the convergence device in the data determined by the embodiment of the present invention is a data unit that needs to switch the link transmission; If the first link has a retransmission mechanism, that is, the convergence end device retransmits the first link in the unreceived data. In this case, the convergence end determined in the embodiment of the present invention The data unit not received by the device in the data does not include the data unit that the sink device considers need to continue to be retransmitted through the first link.
  • the aggregation device further includes a determining unit 2 2, configured to determine a sequence number of the data unit to be received in the data, and a maximum sequence number of the data unit that the sink device has received, if the data unit to be received The interval between the sequence number and the maximum sequence number of the received data unit satisfies the preset difference condition, and then determines that the data unit corresponding to the sequence number of the to-be-received data unit is a data unit that is not received by the convergence device.
  • a determining unit 2 2 configured to determine a sequence number of the data unit to be received in the data, and a maximum sequence number of the data unit that the sink device has received, if the data unit to be received The interval between the sequence number and the maximum sequence number of the received data unit satisfies the preset difference condition, and then determines that the data unit corresponding to the sequence number of the to-be-received data unit is a data unit that is not received by the convergence device.
  • the data unit is a P D C P protocol data unit, and the convergence end device sends a status report to the distribution device as a P DC P status report.
  • the convergence end device presets a threshold value of a difference between V Rh and VR r in a receiving window of a P DC P layer of the convergence end device, if the receiving window is If the difference between VRh and VR r reaches the threshold, the convergence device determines The data unit corresponding to the VRr is a data unit that needs to switch the link transmission.
  • the convergence device may also preset a transmission window corresponding to the RLC layer of the convergence device.
  • the threshold of the difference between VRh and VRr if the difference between VRh and VRr in the transmission window of the RLC layer reaches the threshold, the RLC layer indicates that the data unit corresponding to the VRr of the PDCP layer of the convergence device is required to be switched.
  • the data unit of the link transmission thereby triggering the PDCP to generate a PDCP status report.
  • the determining unit 22 is configured to determine, when the sequence number of the data unit to be received in the data does not update, when the time when the sequence number of the to-be-received data unit does not update meets the preset time threshold. And determining, by the data unit corresponding to the serial number of the to-be-received data unit, a data unit that is not received by the convergence device.
  • the convergence device sets a corresponding timer to the VRr in the receiving window of the DPCP layer in the convergence device, and the timer sets a time threshold. After the VRr is updated, the timer starts or restarts to start timing. When the timer reaches the time threshold, if the VRr has not been updated, the aggregation device determines that the data unit corresponding to the VRr needs to be switched. The data unit of the transfer.
  • the receiving window may also be a receiving window of the RLC layer corresponding to the first link in the convergence device, and the aggregation end is indicated by the RLC layer.
  • PDCP layer of the device The data unit corresponding to the VRr is a data unit that needs to switch the link transmission, thereby triggering the PDCP to generate a PDCP status report.
  • the sending unit 21 is further configured to send a first link failure message to the offloading device, so that the offloading device initiates a first link deletion process according to the status report and the first link failure message.
  • the offloading device stops sending data to the aggregation device through the first link, and sends the data to the aggregation.
  • the data unit switching link of the end device is retransmitted to the sink device.
  • the aggregation device further includes a processing unit 23, configured to: after receiving the data unit that is not received by the convergence device, adjust the receiving of the RLC layer of the first link. The state variable in the window.
  • the state variable in the receiving window includes a sequence number of a next data unit to be received in the data and a maximum sequence number of the received data unit in the data.
  • the RLC layer in the first link includes a transmitting end and a receiving end.
  • the acknowledgment mode after the sending end of the RLC layer sends data to the receiving end, the receiving end may request the receiving end to correctly receive the feedback. Therefore, the sequence number of the next to-be-confirmed data unit in the transmission window of the RLC layer corresponds to the sequence number of the next desired data unit in the RLC layer reception window.
  • the distribution device sends an RLC control message to the RLC layer of the first link, so that the RLC is used.
  • the layer adjusts the state variables in the transmit window of the RLC layer according to the RLC control message.
  • the aggregation device further includes an indication unit 24, after the adjusting the state variable in the receiving window of the RLC layer in the first link, indicating that the first link adjusts the first link State variables in the send window of the RLC layer. That is, the aggregation end device sends an RLC control message after adjusting the state variable in the receiving window of the RLC layer in the first link, so that the RLC layer adjusts the sending window of the RLC layer according to the RLC control message. State variable.
  • the distribution device transmits data to the aggregation device through the first link, and the convergence device sends a status report to the distribution device indicating that the data unit is not received by the convergence device, so that the The distribution device indicates that the first link stops transmitting the data unit to the aggregation device according to the status report, and retransmits the data unit to the convergence device through the second link.
  • the convergence device can notify the distribution device to switch the data unit not sent to the convergence device in the first link by the second chain with a higher transmission rate.
  • the path is transmitted, which improves the efficiency of data retransmission and reduces the retransmission delay.
  • the embodiment of the invention provides a shunt device 30, as shown in FIG. 3, the shunt terminal a processor 31, a communication interface 32, a memory 33, and a communication bus 34; wherein the processor 31, the communication interface 32, and the memory 33 pass the communication
  • the bus 34 completes communication with each other.
  • the processor 31 may be a multi-core CPU, or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.
  • ASIC Application Specific Integrated Circuit
  • the memory 33 is for storing program code including computer operation instructions and network flow diagrams.
  • Memory 33 may contain high speed RAM memory and may also include non-volatile memory, such as at least one disk storage. Memory 33 can also be a memory array.
  • the memory 33 may also be partitioned, and the blocks may be combined into a virtual volume according to certain rules.
  • the communication interface 32 is configured to implement connection communication between the devices.
  • the processor 31 is configured to execute program code in the memory 33 to:
  • the data unit is retransmitted to the sink device via a second link.
  • the operations further include: determining a sequence number of the data unit to be confirmed in the data and a sequence number of the data unit to be sent in the branching device;
  • the operations further include: determining a time when the serial number of the to-be-confirmed data unit in the data has not been updated;
  • the operation further includes: receiving a status report sent by the aggregation device, where the status report includes indication information of a sequence number of the data unit not received by the convergence device in the data;
  • the indicating that the first link stops transmitting the data unit that is not received by the aggregation device to the aggregation device includes:
  • a handover link message Transmitting, to the RL C layer of the first link, a handover link message, where the handover link message includes indication information of a maximum sequence number of all sequence numbers of the data unit, so that the RLC layer is configured according to the maximum
  • the indication information of the serial number stops transmitting the data unit corresponding to the maximum sequence number and the data unit whose sequence number is smaller than the maximum sequence number.
  • the operation further includes:
  • the state variable in the transmission window including a sequence number of a next to-be-confirmed data unit in the data and a next one in the data Send the serial number of the data unit;
  • the operations further include:
  • a state variable in the transmit window includes a sequence number of a next data unit to be transmitted in the data.
  • the operations further include: receiving a first link failure message; and initiating a first link deletion process according to the first link failure message.
  • the data unit is a P DC P protocol data unit.
  • the offloading device is a primary base station, and the convergence end device is a terminal.
  • the system in which the terminal communicates with multiple base stations includes a primary base station, at least one secondary base station, and a terminal, and the primary base station and the secondary base station downlink to the terminal simultaneously or in a time-sharing manner.
  • the primary base station divides the data through the PDCP layer of the primary base station, and the split data is aggregated at the PDCP layer of the terminal.
  • the split end device is the primary base station, and the convergence end device That is the terminal.
  • the primary base station sends the offloaded data to the terminal through the different links
  • the first link may be the secondary base station, and the secondary base station sends the offloaded data to the terminal.
  • the link may also be a link that the primary base station sends the offloaded data to the terminal.
  • the offloading device is a terminal
  • the convergence end device is a primary base station.
  • the terminal when the terminal transmits data to the base station, the data is offloaded by the PDCP layer of the terminal, and is aggregated at the PDCP layer of the primary base station, where the split end is
  • the device is the terminal, and the aggregation device is the primary base station
  • the first link may be a link that passes through the secondary base station, and the secondary base station sends the offloaded data to the primary base station, the first link.
  • the path may also be a link that the terminal sends the offloaded data to the primary base station.
  • the shunt device transmits data to the sink device through the first link, and when it is determined that the data unit not received by the sink device exists in the data, the shunt device indicates the first The link stops transmitting the data unit not received by the sink device to the sink device, and retransmits the data unit to the sink device through the second link.
  • the branching device can transmit the data unit that is not sent to the aggregation device in the first link by using the second link with a higher transmission rate. Improve the efficiency of data retransmission and reduce the retransmission delay.
  • the embodiment of the present invention provides a convergence end device 40. As shown in FIG. 4, the convergence end device 40 includes:
  • the processor 41 may be a multi-core CPU or an Application Specific Integrated Circuit (ASIC) or one or more integrated circuits configured to implement embodiments of the present invention.
  • ASIC Application Specific Integrated Circuit
  • the memory 43 is for storing program code, the program code including computer operation instructions and network flow diagrams.
  • Memory 43 may contain high speed RAM memory and may also include non-volatile memory, such as at least one disk storage. Memory 43 can also be a memory array.
  • the memory 43 may also be partitioned, and the blocks may be combined into a virtual volume according to certain rules.
  • the communication interface 42 is used to implement connection communication between these devices.
  • the processor 41 is configured to execute program code in the memory 43 to:
  • the status report includes indication information of a sequence number of the data unit, and the data sent by the distribution device to the aggregation device through the first link includes the data unit.
  • the operations further include: determining a sequence number of the data unit to be received in the data and a maximum sequence number of the data unit that the convergence device has received;
  • the operations further include: determining a time when the serial number of the data unit to be received in the data does not update;
  • the operations further include: adjusting a state variable in a receiving window of the RL C layer of the first link, where the state variable in the receiving window includes a next data unit to be received in the data The serial number and the maximum sequence number of the received data unit in the data.
  • the operations further include: sending, by the distribution device, a first link failure message, so that the distribution device initiates a first link deletion according to the status report and the first link failure message. process.
  • the operation before the adjusting the state variable in the receiving window of the RL C layer in the first link, the operation further includes:
  • the RL C layer in the first link assembles and submits all the complete RL C service data units to the P DC P layer of the sink device.
  • the operation further includes:
  • the data unit includes a P DC P protocol data unit.
  • the offloading device is a primary base station, and the convergence end device is a terminal.
  • the system in which the terminal communicates with multiple base stations includes a primary base station, at least one secondary base station, and a terminal, and when the primary base station and the secondary base station simultaneously or time-divisionally transmit data to the terminal, the primary base station passes the data.
  • the P DC P layer of the primary base station performs offloading, and the split data is aggregated at the P DC P layer of the terminal.
  • the split end device is the primary base station, and the convergence end device is the terminal.
  • the primary base station sends the offloaded data to the terminal through the different links
  • the first link may be the secondary base station, and the secondary base station sends the offloaded data to the terminal.
  • the link may also be a link that the primary base station sends the offloaded data to the terminal.
  • the offloading device is a terminal
  • the convergence end device is a primary base station.
  • the terminal when the terminal uplinks data to the base station, the data is shunted through the P DC P layer of the terminal, and is in the primary base.
  • the PDCP layer of the station is aggregated.
  • the branch device is the terminal, and the sink device is the primary base station.
  • the first link may be the secondary base station, and the secondary base station will split the data.
  • the link sent to the primary base station which may also be the link that the terminal sends the offloaded data to the primary base station.
  • the distribution device transmits data to the aggregation device through the first link, and the convergence device sends a status report to the distribution device indicating that the data unit is not received by the convergence device, so that the The distribution device indicates that the first link stops transmitting the data unit to the aggregation device according to the status report, and retransmits the data unit to the convergence device through the second link.
  • the convergence device can notify the distribution device to switch the data unit not sent to the convergence device in the first link by the second chain with a higher transmission rate.
  • the path is transmitted, which improves the efficiency of data retransmission and reduces the retransmission delay.
  • the embodiment of the present invention provides a base station 50, as shown in FIG. 5a or 5b, including the shunt device 10 shown in FIG. 1 (FIG. 5a) or the shunt device 30 shown in FIG. 3 (FIG. 5b).
  • a base station 50 as shown in FIG. 5a or 5b, including the shunt device 10 shown in FIG. 1 (FIG. 5a) or the shunt device 30 shown in FIG. 3 (FIG. 5b).
  • FIG. 5a or 5b for a detailed description of the shunt device, reference may be made to the corresponding description in the embodiment shown in FIG. 1 or FIG. 3 above.
  • the base station is configured to send data to the aggregation device by using the first link, and when determining that the data unit is not received by the convergence device, the base station indicates that the first link stops from the convergence.
  • the end device transmits the data unit that is not received by the sink device, and retransmits the data unit to the sink device through the second link.
  • the base station can transmit the data unit that is not sent to the aggregation device in the first link by the second link with a higher transmission rate, thereby improving The efficiency of data retransmission reduces the retransmission delay.
  • the embodiment of the present invention provides a base station 60, as shown in FIG. 6a or 6b, including the convergence end device 20 shown in FIG.
  • the distribution device uses the above base station to transmit data to the base station through the first link, and the base station sends a status report to the distribution device indicating that the data unit is not received by the base station, so that the distribution device reports the indication according to the status.
  • the first link stops transmitting the data unit to the base station and retransmits the data unit to the base station over the second link.
  • the base station may notify the branching device to transmit the data unit that is not sent to the base station in the first link by the second link with a higher transmission rate.
  • the embodiment of the present invention provides a terminal 70, as shown in FIG. 7a or 7b, including the shunt device 10 or FIG. 3 (FIG. 7b) shown in FIG. 1 (FIG. 7a).
  • FIG. 7a or 7b including the shunt device 10 or FIG. 3 (FIG. 7b) shown in FIG. 1 (FIG. 7a).
  • the terminal uses the terminal to send data to the sink device through the first link, and when it is determined that the data unit is not received by the sink device, the terminal indicates that the first link stops from the convergence.
  • the end device transmits the data unit that is not received by the sink device, and retransmits the data unit to the sink device through the second link.
  • the terminal can transmit the data unit that is not sent to the aggregation device in the first link by the second link with a higher transmission rate, thereby improving The efficiency of data retransmission reduces the retransmission delay.
  • the embodiment of the present invention provides a terminal 80, as shown in FIG. 8a or 8b, including the convergence end device 20 shown in FIG. 2 (FIG. 8a) or FIG. 4 (FIG. 8b).
  • Convergence end device 40 For a detailed description of the convergence end device, reference may be made to the corresponding description in the embodiment shown in Fig. 2 or Fig. 4 above.
  • the distribution device transmits data to the terminal through the first link, and the terminal sends a status report to the distribution device indicating that the data unit is not received by the terminal, so that the distribution device reports the indication according to the status.
  • the first link stops transmitting the data unit to the terminal and retransmits the data unit to the terminal over the second link. In this way, when there is a problem in the data transmission of the first link, the terminal can notify the branching device to switch the data unit not sent to the terminal in the first link by the transmission rate.
  • the high second link transmits, which improves the efficiency of data retransmission and reduces the retransmission delay.
  • An embodiment of the present invention provides a data retransmission method, where the method is applied to a system in which a terminal communicates with multiple base stations. As shown in FIG. 9, the method includes:
  • the distribution device sends data to the convergence device through the first link.
  • the system in which the terminal communicates with multiple base stations is as shown in FIG. 10, and includes at least one secondary base station, a primary base station, and a terminal, and the connection relationship is as shown in FIG. 10.
  • the primary base station includes a PDCP layer, an RLC layer, a MAC (Media Access Control) layer, and a PHY (Physical Layer Device);
  • the secondary base station includes an RLC layer, a MAC layer, and a PHY layer;
  • the terminal includes a PDCP layer And the RLC layer, the MAC layer, and the PHY layer corresponding to the link where the primary base station is located, and the RLC layer, the MAC layer, and the PHY layer corresponding to the link where the secondary base station is located.
  • the offloading device is a primary base station, and the convergence end device is a terminal.
  • the primary base station when the primary base station and the secondary base station send data to the terminal downlink or time-divisionally, the primary base station performs the traffic distribution on the PDCP layer of the primary base station, and the split data is aggregated in the PDCP layer of the terminal.
  • the branch device is the primary base station, and the sink device is the terminal.
  • the primary base station sends the offloaded data to the terminal through the different links
  • the first link may be the secondary base station, and the secondary base station sends the offloaded data to the terminal.
  • the link may also be a link that the primary base station sends the offloaded data to the terminal.
  • the offloading device is a terminal
  • the convergence end device is a primary base station.
  • the terminal when the terminal transmits data to the base station, the data is offloaded by the PDCP layer of the terminal, and is aggregated at the PDCP layer of the primary base station, where the split end is
  • the device is the terminal, and the aggregation device is the primary base station
  • the first link may be a link that passes through the secondary base station, and the secondary base station sends the offloaded data to the primary base station, the first link.
  • the path may also be a link that the terminal sends the offloaded data to the primary base station.
  • the distribution device indicates that the first link stops transmitting to the convergence device.
  • the data unit that the sink device does not receive.
  • the data includes the data unit.
  • the off-end device determines, before the first link stops transmitting the data unit that is not received by the sink device to the sink device, the data unit that is not received by the sink device.
  • the data unit that is not received by the convergence device is a data unit that needs to switch the link transmission; if the first link has a retransmission mechanism, That is, the first end link of the convergence end device is retransmitted in the unreceived data unit.
  • the data unit not received by the convergence end device is a data unit that needs to switch the link transmission, that is, The data unit does not include data units that the off-end device considers need to continue to be retransmitted over the first link.
  • the embodiment of the present invention includes the following three implementation manners:
  • the branching device determines a sequence number of the data unit to be confirmed in the data and a sequence number of the data unit to be transmitted in the branching device, and the serial number of the data unit to be transmitted and the data unit to be confirmed
  • the interval between the sequence numbers satisfies the preset difference condition, and the data unit corresponding to the sequence number of the to-be-confirmed data unit is determined to be a data unit that the sink device does not receive in the data.
  • the transmission window of the PDCP layer of the distribution device includes a state variable.
  • VTs and state variables VTa where VTs represents the sequence number of the next data unit to be transmitted, and VTa represents the sequence number of the next data unit desiring to receive the acknowledgment.
  • the branching device is a primary base station
  • the sinking end device is a terminal
  • the primary base station presets VTs and VTas in a sending window of the PDCP layer of the primary base station.
  • the threshold of the difference if the difference between the VTs and the VTa in the transmission window of the PDCP layer reaches the threshold, the primary base station determines that the data unit corresponding to the VTa is a data unit that needs to switch the link transmission.
  • the primary base station may also preset a threshold of the difference between the VTs and the VTa in the transmission window of the RLC layer of the primary base station, if the sending of the RLC layer If the difference between the VTs and the VTa in the window reaches the threshold, the primary base station determines that the data unit corresponding to the VTa is a data unit that needs to switch the link transmission; If the first link is a link that passes through the secondary base station, the secondary base station may determine, by using a state variable in the transmit window of the RLC layer in the secondary base station, and RLC protocol data unit generation information to determine a data unit that needs to switch the link transmission. And notifying the primary base station when a handover or secondary base station radio link failure or RLC re-establishment occurs.
  • the sink device is a terminal, and the sink device is a primary base station, and the terminal presets a difference between the VTs and the VTa in the transmit window of the PDCP layer of the terminal. Threshold, if the difference between VTs and VTa in the transmit window of the PDCP layer reaches the threshold, the terminal determines that the data unit corresponding to the VTa is a data unit that needs to switch the link transmission.
  • the terminal may further preset a threshold of the difference between the VTs and the VTa in the sending window of the RLC layer corresponding to the first link in the terminal, if the difference between the VTs and the VTa in the sending window of the RLC layer reaches the threshold Threshold, the terminal determines that the data unit corresponding to the VTa is a data unit that needs to switch the link transmission.
  • the branching device determines a time when the sequence number of the to-be-confirmed data unit in the data has not been updated, and determines that the time when the time when the sequence number of the to-be-confirmed data unit does not update meets the preset time threshold
  • the data unit corresponding to the serial number of the confirmation data unit is a data unit that the sink device does not receive in the data.
  • the shunt device sets a corresponding timer to VTa in the transmission window, and the timer sets a time threshold. After the VTa is updated, the timer starts or restarts to start timing. When the timer reaches the time threshold, if the VTa has not been updated, the branch device determines that the data unit corresponding to the VTa needs to be switched. The data unit of the transfer.
  • the send window may be the transmit window of the PDCP layer of the primary base station; if the split end device is the primary base station, the convergence end device is the terminal, The first link passes through the RLC layer of the primary base station, and the transmission window may be a transmission window of the RLC layer of the primary base station; if the distribution device is a terminal and the aggregation device is the primary base station, the sending window may be The transmission window corresponding to the PDCP layer of the terminal or the transmission window of the RLC layer corresponding to the first link in the terminal.
  • Manner 3 The distribution device receives a status report sent by the convergence device, and The status report includes a sequence number of the data unit that is not received by the sink device in the data, and the branch device determines, according to the sequence number, the data unit that the sink device does not receive in the data.
  • the data unit is a PDCP protocol data unit
  • the status report is a PDCP status report.
  • the offloading end device may send a PDCP polling request message to the sinking end device, and receive a PDCP status report sent by the sinking end device according to the PDCP polling request message; the shunting end device may also receive the converging end device Self-triggered PDCP status report.
  • the receiving window of the PDCP layer of the convergence device includes a state variable VRr and a state variable VRh, wherein the VRr represents a sequence number of a next desired data unit, and the VRh is represented in the received data unit.
  • the next serial number of the largest serial number is a state variable VRr and a state variable VRh, wherein the VRr represents a sequence number of a next desired data unit, and the VRh is represented in the received data unit.
  • the next serial number of the largest serial number is the receiving window of the PDCP layer of the convergence device.
  • the aggregation device may determine that the data unit corresponding to the VRr is a data unit that needs to be switched for transmission when the difference between the VRr and the VRh in the receiving window meets the preset difference threshold; the convergence device may also be in the When the time when the VRr has not been updated meets the preset time threshold, it is determined that the data unit corresponding to the VRr is a data unit that needs to be switched for link transmission.
  • the receiving window may be a receiving window of the RLC layer corresponding to the first link or a receiving window of the PDCP layer in the terminal, if the sinking device is the primary base station, and the sinking end device is the terminal; If the sink device is a terminal and the sink device is the primary base station, the receive window may be a receive window of the PDCP layer of the primary base station or a receive window of the RLC layer through which the first link passes.
  • the first mode and the second mode are the data units that are not received by the convergence end device determined by the distribution device itself.
  • the third method is that after the convergence device itself determines the unreceived data unit, the distribution device receives the aggregation device to send.
  • the PDCP status report, and the data unit not received by the convergence device is determined by the PDCP status report.
  • the split end sends a switch link message to the RLC layer in the first link, where the switch link message includes the data unit The index of the largest serial number in all serial numbers The information is displayed, so that the RLC layer stops transmitting the data unit corresponding to the maximum sequence number and the data unit whose sequence number is smaller than the maximum sequence number according to the indication information of the maximum sequence number.
  • the branch device needs to switch the data unit of the link transmission after determining the data transmitted by the first link.
  • the end device stops transmitting the corresponding maximum serial number
  • the first link is a link that the primary base station sends data to the terminal through the secondary base station, and the primary base station sends a handover link to the secondary base station after determining that the data unit of the link transmission needs to be switched in the first link.
  • the message indicates that the RLC layer in the secondary base station stops transmitting the RLC protocol data unit corresponding to the sequence number below the maximum sequence number.
  • the offloading device receives the first link failure message before instructing the first link to stop transmitting the data unit, and initiates a first link deletion process according to the first link failure message.
  • the first link failure message includes a first link failure message sent by the aggregation device or a first link failure message sent by the sending device corresponding to the first link.
  • the offloading device stops sending data to the aggregation device through the first link, and sends the data to the aggregation.
  • the data unit switching link of the end device is retransmitted to the sink device.
  • the offloading device adjusts the RLC layer in the first link after the indicating that the first link stops transmitting the data unit.
  • the status variable in the send window includes the sequence number of the next data unit to be transmitted in the data.
  • the VTs in the transmission window of the RLC layer is 5 before the first end link stops transmitting the data unit, and if all the data units of the link transmission need to be switched in the first link,
  • the maximum sequence number in the sequence number is 5, and after the branch device indicates that the first link stops transmitting the data unit, the RLC layer stops transmitting all data units whose sequence number is less than or equal to 5, so the RLC layer
  • the next data unit to be transmitted is a data unit whose sequence number is greater than 5, such as a data unit with sequence number 8, and the branch device indicates that the RLC layer updates the VTs in the transmission window from 5 to 8.
  • the offloading device adjusts the sending of the RLC layer in the first link after the indicating that the first link stops transmitting the data unit. a state variable in the window and indicating that the first link adjusts a state variable in a receive window of the RLC layer of the first link.
  • the state variable in the transmission window includes a sequence number of a next to-be-confirmed data unit in the data and a sequence number of a next to-be-sent data unit in the data.
  • the RLC layer in the first link includes a transmitting end and a receiving end.
  • the RLC layer in the secondary base station is the transmitting end
  • the RLC layer in the terminal is the receiving end
  • the sending window of the RLC layer is the sending window of the RLC layer in the secondary base station.
  • the receiving window of the RLC layer is the receiving window of the RLC layer in the terminal. If the RLC layer of the first link is in the acknowledge mode, the transmitting end of the RLC layer may request the receiving end after transmitting data to the receiving end.
  • the device After adjusting the sending window of the RLC layer, the device sends an RLC control message to the receiving end, instructing the receiving end to perform corresponding adjustment on the receiving window of the RLC layer according to the RLC control message. So that the branching device continues to transmit data other than the data unit that needs to be switched by the link to the sink device through the first link. S903. The distribution device retransmits the data unit to the convergence device through the second link.
  • the sink device is a terminal
  • the sink device is a master base station
  • the first link passes through the secondary base station
  • the wireless network signal between the secondary base station and the sink device is weak, causing the secondary base station to If there is a data unit that needs to switch the link transmission in the data sent by the terminal, the primary base station, after determining that there is a data unit that needs to switch the link transmission, indicates that the secondary base station stops transmitting the data unit, and the data unit is The primary base station sends the terminal to the terminal, that is, the second link is a link that passes through the primary base station.
  • the primary base station determines that there is a need to switch in the data. After the data unit of the link transmission, the secondary base station with a fast transmission rate is determined, and the data unit is sent to the terminal through the secondary base station.
  • MP TCP Multipath Transmission Control Protocol
  • TCP Transmission Control Protocol
  • UDP User Datagram Protocol
  • the scene of the layer For example, it is also applicable to IP as a shunt/convergence protocol layer.
  • the following maps to multiple LTE (Long Term Evolution) PDCPs, and even maps to the LTE PDCP and WiFi MAC layers.
  • the distribution device transmits data to the aggregation device through the first link, and when it is determined that the data unit is not received by the convergence device, the distribution device indicates that the first link is stopped. Transmitting, to the sink device, a data unit not received by the sink device, and retransmitting the data unit to the sink device through the second link.
  • the branching device can transmit the data unit that is not sent to the aggregation device in the first link by using the second link with a higher transmission rate. Improve the efficiency of data retransmission and reduce the retransmission delay.
  • An embodiment of the present invention provides another method for data retransmission. The method is applied to a system in which a terminal communicates with multiple base stations. As shown in FIG. 1 , the method includes:
  • the convergence device sends a status report indicating that the data unit is not received by the convergence device, so that the distribution device instructs the first link to stop transmitting the data unit to the convergence device according to the status report. And retransmitting the data unit to the sink device through the second link.
  • the status report includes indication information of a sequence number of the data unit, and the data sent by the distribution device to the aggregation device through the first link includes the data unit.
  • the offloading device sends data to the sinking device through the first link, and the shunt device diverts the data through the PDCP layer of the shunt device, and the shunt device passes the shunted data through different The link is sent to the sink device.
  • the offloading device is a primary base station, and the convergence end device is a terminal.
  • the system in which the terminal communicates with multiple base stations includes a primary base station, at least one secondary base station, and a terminal, and when the primary base station and the secondary base station simultaneously or time-divisionally transmit data to the terminal, the primary base station passes the data.
  • the PDCP layer of the primary base station performs offloading, and the split data is aggregated at the PDCP layer of the terminal.
  • the split end device is the primary base station, and the convergence end device is the terminal.
  • the primary base station sends the offloaded data to the terminal through the different links
  • the first link may be the secondary base station, and the secondary base station sends the offloaded data to the terminal.
  • the link may also be a link that the primary base station sends the offloaded data to the terminal.
  • the offloading device is a terminal
  • the convergence end device is a primary base station.
  • the terminal when the terminal transmits data to the base station, the data is offloaded by the PDCP layer of the terminal, and is aggregated at the PDCP layer of the primary base station, where the split end is
  • the device is the terminal, and the aggregation device is the primary base station, and the first link may be a link that passes through the secondary base station, and the secondary base station sends the offloaded data to the primary base station, the first link.
  • Road may also be by terminal The offloaded data is sent to the link of the primary base station.
  • the convergence device determines a data unit not received by the convergence device before transmitting the status report to the distribution device.
  • the data unit that is not received by the convergence device in the data determined by the embodiment of the present invention is a data unit that needs to switch the link transmission; If the first link has a retransmission mechanism, that is, the convergence end device retransmits the first link in the unreceived data. In this case, the convergence end determined in the embodiment of the present invention The data unit not received by the device in the data does not include the data unit that the sink device considers need to continue to be retransmitted through the first link.
  • the aggregation device determines a sequence number of the data unit to be received in the data and a maximum sequence number of the data unit that the sink device has received, if the sequence number of the data unit to be received and the received data unit The interval between the maximum sequence numbers satisfies the preset difference condition, and then determines that the data unit corresponding to the sequence number of the to-be-received data unit is a data unit that is not received by the convergence device.
  • the data unit is a PDCP protocol data unit
  • the convergence end device sends a status report to the distribution device as a PDC P status report.
  • the convergence end device presets a threshold value of a difference between VRh and VR r in a receiving window of a PDC layer of the convergence device, if the VRh in the receiving window is If the difference between VR r reaches the threshold, the aggregation device determines that the data unit corresponding to the VR r is a data unit that needs to switch the link transmission.
  • the aggregation device may also preset the transmission corresponding to the RLC layer of the convergence device.
  • the data unit is a data unit that needs to switch the link transmission, thereby triggering the PDCP to generate a PDCP status report.
  • the aggregation device determines a time when the sequence number of the data unit to be received in the data does not update, and does not update the sequence number of the to-be-received data unit. When the time meets the preset time threshold, it is determined that the data unit corresponding to the serial number of the data unit to be received is a data unit that is not received by the convergence device.
  • the convergence device sets a corresponding timer to the VRr in the receiving window of the DPCP layer in the convergence device, and the timer sets a time threshold. After the VRr is updated, the timer starts or restarts to start timing. When the timer reaches the time threshold, if the VRr has not been updated, the aggregation device determines that the data unit corresponding to the VRr needs to be switched. The data unit of the transfer.
  • the receiving window may also be a receiving window of the RLC layer corresponding to the first link in the convergence device, and the aggregation end is indicated by the RLC layer.
  • PDCP layer of the device The data unit corresponding to the VRr is a data unit that needs to switch the link transmission, thereby triggering the PDCP to generate a PDCP status report.
  • the convergence end device sends a first link failure message to the distribution end device, so that the distribution end device initiates a first link deletion process according to the status report and the first link failure message.
  • the offloading device stops sending data to the aggregation device through the first link, and sends the data to the aggregation.
  • the data unit switching link of the end device is retransmitted to the sink device.
  • the RLC layer in the first link includes a transmitting end and a receiving end.
  • the acknowledgment mode after the sending end of the RLC layer sends data to the receiving end, the receiving end may request the receiving end to correctly receive the feedback. Therefore, the sequence number of the next to-be-confirmed data unit in the transmission window of the RLC layer corresponds to the sequence number of the next desired data unit in the RLC layer reception window.
  • the offloading device After receiving the PDCP report sent by the aggregation end, the offloading device sends an RLC control message to the RLC layer in the first link, so that the RLC layer adjusts the sending window of the RLC layer according to the RLC control message.
  • the convergence end device after adjusting the state variable in the receiving window of the RLC layer in the first link, instructing the first link to adjust the first chain The state variable in the send window of the RLC layer of the road.
  • the aggregation end device sends an RLC control message after adjusting the state variable in the receiving window of the RLC layer in the first link, so that the RLC layer adjusts the sending window of the RL C layer according to the RLC control message.
  • the distribution device transmits data to the aggregation device through the first link, and the convergence device sends a status report to the distribution device indicating that the data unit is not received by the convergence device, so that the distribution end
  • the device instructs the first link to stop transmitting the data unit to the sink device according to the status report, and retransmits the data unit to the sink device through the second link.
  • the convergence device can notify the distribution device to switch the data unit not sent to the convergence device in the first link by the second chain with a higher transmission rate.
  • the path is transmitted, which improves the efficiency of data retransmission and reduces the retransmission delay.
  • the method is performed by using a primary base station as a distribution end device, and the terminal is used as a convergence end device, and the first link is a link that passes through the secondary base station, and includes:
  • the primary base station transmits data to the secondary base station.
  • the secondary base station sends the data to the terminal.
  • the data that is sent by the base station to the terminal in the downlink is offloaded in the PDCP layer of the primary base station, and the link that the split data transmits to the terminal through the secondary base station is the first link.
  • the terminal determines, according to the state variable in the receiving window, the data unit in the data that needs to be switched for the link transmission.
  • the terminal may determine that the data unit corresponding to the VR r is a data unit that needs to be switched by the link when the difference between the VR r and the VRh in the receiving window meets the preset difference threshold, or may be The time when the VR r has not been updated meets the preset time At the threshold, it is determined that the data unit corresponding to the VRr is a data unit that needs to switch the link transmission.
  • the receiving unit may be a receiving window of the RLC layer corresponding to the first link in the terminal, or may be a receiving window of the PDCP layer in the terminal.
  • the primary base station sends a PDCP polling request message to the terminal.
  • S1205 The terminal sends a PDCP status report to the primary base station according to the PDCP polling request message.
  • the primary base station determines, according to the PDCP status report, a data unit in the data that needs to be switched for link transmission.
  • the PDCP status report includes a sequence number of the data unit in the data that needs to be switched for the link transmission, and the primary base station determines the corresponding data unit by using the sequence number.
  • S1207 The primary base station sends a handover link message to the secondary base station.
  • the handover link message includes a maximum sequence number in all sequence numbers of data units that need to be switched for link transmission.
  • the secondary base station stops transmitting the data unit according to the handover link message. Specifically, after receiving the handover link message, the secondary base station stops transmitting the data unit corresponding to the maximum sequence number and the data unit whose sequence number is smaller than the maximum sequence number.
  • the primary base station sends the data unit to the terminal by using a second link. Specifically, when the primary base station determines that there is a data unit that needs to switch the link transmission in the data sent by the secondary base station, the primary base station retransmits the data unit to the terminal by using the second link.
  • the primary base station when the primary base station determines that there is a data unit that needs to switch the link transmission, the primary base station sends the data unit to the terminal by itself, if the primary base station needs to switch the data unit of the link transmission.
  • the primary base station can switch the retransmission of the data unit to the terminal by the secondary base station with a high transmission rate.
  • the secondary base station adjusts a state variable in a sending window of the RLC layer of the secondary base station.
  • the VTs in the transmission window of the RLC layer is 5, if the link transmission needs to be switched in the first link. If the maximum sequence number of all the serial numbers of the data unit is 5, after the secondary base station stops transmitting the data unit, since the RLC layer stops transmitting all the data units whose sequence number is less than or equal to 5, the next waiting for the RLC layer
  • the transmitted data unit is a data unit with a sequence number greater than 5, such as a data unit with sequence number 8, and the secondary base station instructs the RLC layer to update the VTs in the transmission window from 5 to 8.
  • the transmitting end of the RLC layer may request the receiving end to correctly receive the data after transmitting the data to the receiving end, and the next to-be-confirmed data in the sending window of the RLC layer.
  • the sequence number of the unit corresponds to the sequence number of the next desired data unit in the RLC layer receive window. In this case, perform the following steps S1211 to S1212.
  • S1211 The secondary base station sends an RLC control message to the terminal.
  • S1212 The terminal adjusts a receiving variable in a receiving window of the RLC layer corresponding to the first link in the terminal according to the RLC control message, so that the secondary base station continues to send the data unit except the link transmission that needs to be switched to the terminal. External data.
  • the primary base station sends a handover link message to notify the secondary base station to adjust the transmission window of the RLC layer of the secondary base station, and then the secondary base station sends an RLC control message to notify the terminal to adjust the terminal accordingly.
  • the terminal may indicate the terminal after determining that the data unit of the link transmission needs to be switched in the data.
  • the RLC layer adjusts the state variable of the receiving window, and sends an RLC control message to the secondary base station to notify the secondary base station to adjust the transmission window of the RLC layer in the secondary base station accordingly.
  • the primary base station can perform the data unit switching in the secondary base station that needs to be switched to be transmitted by the second link with a higher transmission rate, thereby improving data retransmission. Efficiency, reducing retransmission delay.
  • the S130K terminal sends data to the secondary base station.
  • the secondary base station sends the data to the primary base station.
  • the data that the terminal sends uplink to the base station is offloaded at the PDCP layer of the terminal, and the link that the split data transmits to the primary base station through the secondary base station is the first link.
  • the terminal determines, according to a state variable in a transmit window of the PDCP layer, a data unit in the data that needs to be switched for link transmission.
  • the terminal presets a threshold of a difference between VTs and VTa in a transmit window of the PDCP layer or the RLC layer of the terminal, and if the difference between VTs and VTa in the transmit window reaches the threshold, the terminal determines the VTa
  • the corresponding data unit is a data unit that needs to switch the link transmission.
  • the terminal sets a corresponding timer for the VTa in the transmit window of the PDCP layer or the RLC layer of the terminal, and the timer sets a time threshold. After the VTa is updated, the timer starts or restarts to start timing. When the timer reaches the time threshold, if the VTa has not been updated, the terminal determines that the data unit corresponding to the VTa is a link transmission that needs to be switched. Data unit.
  • the PDCP layer in the terminal stops transmitting the PDCP protocol data unit to the RLC of the first link, and the PDCP layer stops passing the first chain. Transmitting, by the path, the data unit corresponding to the maximum sequence number and the data unit whose sequence number is smaller than the maximum sequence number, if the PDCP layer has delivered the data unit to the RLC layer, sending a handover link message to the RLC layer of the terminal, where The switching link message includes all the sequences of data units that need to be switched for link transmission.
  • the maximum sequence number in the column number, the RLC layer stops transmitting the RLC protocol data unit corresponding to the maximum sequence number through the first link, and the RLC protocol data unit whose sequence number is smaller than the maximum sequence number.
  • S1305 The terminal adjusts a state variable in a sending window of the RLC layer corresponding to the first link in the terminal.
  • the terminal sends an RLC control message to the secondary base station.
  • the secondary base station adjusts a state variable in a receiving window of the RLC layer in the secondary base station according to the RLC control message, so that the terminal continues to transmit data other than the data unit that needs to be switched by the link transmission through the first link. .
  • the terminal after adjusting the transmission window of the RLC layer corresponding to the first link in the terminal, the terminal sends an RLC control message to the secondary base station to notify the secondary base station of the RLC layer transmission window adjustment, so that the terminal The secondary base station adjusts the receiving window of the RLC layer in the secondary base station accordingly.
  • S1308 The terminal sends the data unit that needs to be switched by the link to the primary base station by using the second link.
  • the terminal can perform the data unit switching in the secondary base station that needs to be switched to be transmitted by the second link with a higher transmission rate, thereby improving the efficiency of data retransmission. , reduce the retransmission delay.

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Abstract

本发明实施例提供一种数据重传的方法和装置,涉及通信领域,能够提高数据重传的效率,降低重传延迟。该方法包括:分流端装置通过第一链路向汇聚端装置发送数据,并在确定该数据中存在该汇聚端装置未接收到的数据单元时,该分流端装置指示该第一链路停止向该汇聚端装置传输该汇聚端装置未接收到的数据单元,并通过第二链路将该数据单元重传至所述汇聚端装置。本发明实施例用于数据重传。

Description

一种数据重传的方法和装置
技术领域
本发明涉及通信领域, 尤其涉及一种数据重传的方法和装置。 背景技术
随着移动通信技术的发展, 第三代合作伙伴项目对峰值数据传 输速率以及系统带宽等提出了更高的要求。 为了满足这些要求, 现 有技术中, 同一个终端可以同时或分时与多个基站进行通信, 其中, 多个基站中包括一个主基站和至少一个辅基站。
该主基站和至少一个辅基站同时或分时向终端下行发送的数据 通过主基站的 PDCP ( Packet Data Convergence Protocol,分组数 据汇聚协议) 层进行分流, 即该主基站将需要传输至终端的数据分 配给不同的基站进行传输, 该终端从不同的基站接收的数据在终端 的 PDCP层进行汇聚;该终端向基站上行发送的数据通过终端的 PDCP 层进行分流, 该主基站从终端接收到的数据以及从辅基站接收到的 数据在该主基站的 PDCP层进行汇聚。 其中, 该 PDCP层支持重排序 功能, 以便在进行数据汇聚时, 实现按序向上层递交数据。
在上述过程中, 由于不同基站之间的无线网络信号的强度和传 输数据的速率存在差异, 若其中一个基站在传输数据时出现暂时丟 包的现象, 则该 PDCP层需要等待该基站重传丟包数据成功后才能重 排序成功。 因此下行和上行均可能存在由于一个基站出现问题而影 响整体传输效率的情况, 在出现问题的基站的无线网络信号条件很 差时, 重传失败的机会也较大, 则出现问题的基站不断重传不仅浪 费带宽、 而且增加延迟, 影响终端总的数据传输速率。 发明内容
本发明提供一种数据重传的方法和装置, 能够提高数据重传的 效率, 降低重传延迟。 为达到上述目的, 本发明釆用如下技术方案:
第一方面提供一种分流端装置, 包括:
发送单元, 用于通过第一链路向汇聚端装置发送数据;
指示单元, 用于指示所述第一链路停止向所述汇聚端装置传输 所述汇聚端装置未接收到的数据单元; 所述数据包括所述数据单元; 所述发送单元还用于, 通过第二链路将所述数据单元重传至所 述汇聚端装置。
在第一方面的第一种可能的实现方式中, 所述分流端装置还包 括确定单元, 用于确定所述数据中的待确认数据单元的序列号和所 述分流端装置中的待发送数据单元的序列号;
若所述待确认数据单元的序列号与所述待发送数据单元的序列 号之间的间隔满足预设差值条件, 则确定所述待确认数据单元的序 列号对应的数据单元为所述汇聚端装置未接收到的所述数据单元。
结合第一方面, 在第二种可能的实现方式中, 所述分流端装置 还包括确定单元, 用于确定所述数据中的待确认数据单元的序列号 未发生更新的时间;
在所述待确认数据单元的序列号未发生更新的时间满足预设时 间阈值时, 确定所述待确认数据单元的序列号对应的数据单元为所 述汇聚端装置未接收到的所述数据单元。
结合第一方面, 在第三种可能的实现方式中, 所述分流端装置 还包括接收单元, 用于接收所述汇聚端装置发送的状态报告, 所述 状态报告包含所述汇聚端装置在所述数据中未接收到的数据单元的 序列号的指示信息;
所述分流端装置还包括确定单元, 用于根据所述指示信息确定 所述汇聚端装置未接收到的所述数据单元。
结合第一方面至第三种可能的实现方式中的任一项可能的实现 方式, 在第四种可能的实现方式中, 所述发送单元还用于, 向所述 第一链路中的无线链路控制 RL C 层发送切换链路消息, 所述切换链 路消息包括所述数据单元的全部序列号中的最大序列号的指示信 息, 以便所述 RL C 层根据所述最大序列号的指示信息停止传输所述 最大序列号对应的数据单元以及序列号小于所述最大序列号的数据 单元。
结合第一方面至第四种可能的实现方式中的任一项可能的实现 方式, 在第五种可能的实现方式中, 若所述第一链路的 RL C 层釆用 确认模式, 则所述处理单元用于, 调整所述第一链路的 RL C 层的发 送窗口中的状态变量, 所述发送窗口中的状态变量包括所述数据中 的下一个待确认数据单元的序列号和所述数据中的下一个待发送数 据单元的序列号;
所述指示单元还用于, 指示所述第一链路调整所述第一链路的 RL C层的接收窗口中的状态变量。
结合第一方面至第四种可能的实现方式中的任一项可能的实现 方式, 在第六种可能的实现方式中, 所述分流端装置还包括处理单 元, 若所述第一链路的 RL C 层釆用非确认模式, 则所述处理单元用 于, 调整所述第一链路的 R L C 层的发送窗口中的状态变量, 所述发 送窗口中的状态变量包括所述数据中的下一个待发送数据单元的序 列号。
结合第一方面至第二种可能的实现方式中的任一项可能的实现 方式, 在第七种可能的实现方式中, 所述分流端装置还包括接收单 元, 用于接收第一链路失败消息, 其中, 所述第一链路失败消息包 括所述汇聚端装置发送的第一链路失败消息或者所述第一链路对应 的发送装置发送的第一链路失败消息;
所述分流端装置还包括处理单元, 用于根据所述接收单元接收 到的第一链路失败消息发起第一链路删除过程。
结合第一方面至第七种可能的实现方式中的任一项可能的实现 方式, 在第八种可能的实现方式中, 所述数据单元为分组数据汇聚 P DC P协议数据单元。 第二方面提供一种汇聚端装置, 包括: 发送单元, 用于向分流端装置发送指示所述汇聚端装置未接收 到的数据单元的状态报告, 以便所述分流端装置根据所述状态报告 指示第一链路停止向所述汇聚端装置传输所述数据单元, 并通过第 二链路将所述数据单元重传至所述汇聚端装置;
其中, 所述状态报告包含所述数据单元的序列号的指示信息, 所述分流端装置通过所述第一链路向所述汇聚端装置发送的数据包 括所述数据单元。
在第二方面的第一种可能的实现方式中, 所述汇聚端装置还包 括确定单元, 用于确定所述数据中的待接收数据单元的序列号和所 述汇聚端装置已接收数据单元的最大序列号;
若所述待接收数据单元的序列号与所述已接收数据单元的最大 序列号之间的间隔满足预设差值条件, 则确定所述待接收数据单元 的序列号对应的数据单元为所述汇聚端装置未接收到的所述数据单 元。
结合第二方面, 在第二种可能的实现方式中, 所述汇聚端装置 还包括确定单元, 用于确定所述数据中的待接收数据单元的序列号 未发生更新的时间;
在所述待接收数据单元的序列号未发生更新的时间满足预设时 间阈值时, 确定所述待接收数据单元的序列号对应的数据单元为所 述汇聚端装置未接收到的所述数据单元。
结合第一方面至第二种可能的实现方式中的任一项可能的实现 方式, 在第三种可能的实现方式中, 所述汇聚端装置还包括处理单 元, 用于调整所述第一链路的 RL C 层的接收窗口中的状态变量, 所 述接收窗口中的状态变量包括所述数据中的下一个待接收数据单元 的序列号和所述数据中的已接收数据单元的最大序列号。
结合第三种可能的实现方式, 在第四种可能的实现方式中, 所 述分流端装置还包括指示单元, 用于指示所述第一链路调整所述第 一链路的 RL C层的发送窗口中的状态变量。
结合第一方面至第二种可能的实现方式中的任一项可能的实现 方式, 在第五种可能的实现方式中, 所述发送单元还用于, 向所述 分流端装置发送第一链路失败消息, 以便所述分流端装置根据所述 状态报告和所述第一链路失败消息发起第一链路删除过程。
结合第一方面至第五种可能的实现方式中的任一项可能的实现 方式, 在第六种可能的实现方式中, 所述数据单元包括 P DC P协议数 据单元。 第三方面提供一种基站, 所述基站包括第一方面至第八种可能 的实现方式中任一项可能的实现方式所述的分流端装置; 或者所述 基站包括第二方面至第六种可能的实现方式中任一项可能的实现方 式所述的汇聚端装置。 第四方面提供一种终端, 所述终端包括第一方面至第八种可能 的实现方式中任一项可能的实现方式所述的分流端装置; 或者所述 终端包括第二方面至第六种可能的实现方式中任一项可能的实现方 式所述的汇聚端装置。 第五方面提供一种数据重传的方法, 包括:
分流端装置通过第一链路向汇聚端装置发送数据;
所述分流端装置指示所述第一链路停止向所述汇聚端装置传输 所述汇聚端装置未接收到的数据单元, 所述数据包括所述数据单元; 所述分流端装置通过第二链路将所述数据单元重传至所述汇聚 端装置。
在第五方面的第一种可能的实现方式中, 还包括:
确定所述数据中的待确认数据单元的序列号和所述分流端装置 中的待发送数据单元的序列号;
若所述待发送数据单元的序列号与所述待确认数据单元的序列 号之间的间隔满足预设差值条件, 则确定所述待确认数据单元的序 列号对应的数据单元为所述汇聚端装置未接收到的所述数据单元。 结合第五方面, 在第二种可能的实现方式中, 还包括: 确定所述数据中的待确认数据单元的序列号未发生更新的时 间;
在所述待确认数据单元的序列号未发生更新的时间满足预设时 间阈值时, 确定所述待确认数据单元的序列号对应的数据单元为所 述汇聚端装置未接收到的所述数据单元。
结合第五方面, 在第三种可能的实现方式中, 还包括: 接收所述汇聚端装置发送的状态报告, 所述状态报告包含所述 汇聚端装置在所述数据中未接收到的数据单元的序列号的指示信 息;
根据所述指示信息确定所述汇聚端装置未接收到的所述数据单 元。
结合第五方面至第三种可能的实现方式中的任一项可能的实现 方式, 在第四种可能实现方式中, 所述指示所述第一链路停止向所 述汇聚端装置传输所述汇聚端装置未接收到的数据单元包括:
向所述第一链路的 RL C 层发送切换链路消息, 所述切换链路消 息包括所述数据单元的全部序列号中的最大序列号的指示信息, 以 便所述 R L C 层根据所述最大序列号的指示信息停止传输所述最大序 列号对应的数据单元以及序列号小于所述最大序列号的数据单元。
结合第五方面至第四种可能的实现方式中的任一项可能的实现 方式, 在第五种可能实现方式中, 若所述第一链路的 R L C 层釆用确 认模式,所述方法还包括:
调整所述第一链路的 R L C 层的发送窗口中的状态变量, 所述发 送窗口中的状态变量包括所述数据中的下一个待确认数据单元的序 列号和所述数据中的下一个待发送数据单元的序列号;
指示所述第一链路调整所述第一链路的 RL C 层的接收窗口中的 状态变量。
结合第五方面至第四种可能的实现方式中的任一项可能的实现 方式, 在第六种可能实现方式中, 若所述第一链路的 R L C 层釆用非 确认模式,所述方法还包括:
调整所述第一链路的 R L C 层的发送窗口中的状态变量; 所述发 送窗口中的状态变量包括所述数据中的下一个待发送数据单元的序 列号。
结合第五方面至第二种可能的实现方式中的任一项可能的实现 方式, 在第七种可能实现方式中, 所述方法还包括, 接收第一链路 失败消息; 根据所述第一链路失败消息发起第一链路删除过程。
结合第五方面至第七种可能的实现方式中的任一项可能的实现 方式, 在第八种可能实现方式中, 所述数据单元为 P DC P协议数据单 元。 第六方面提供一种数据重传的方法, 包括:
汇聚端装置向分流端装置发送指示所述汇聚端装置未接收到的 数据单元的状态报告, 以便所述分流端装置根据所述状态报告指示 第一链路停止向所述汇聚端装置传输所述数据单元, 并通过第二链 路将所述数据单元重传至所述汇聚端装置;
其中, 所述状态报告包含所述数据单元的序列号的指示信息, 所述分流端装置通过所述第一链路向所述汇聚端装置发送的数据包 括所述数据单元。
在第六方面的第一种可能的实现方式中, 还包括:
确定所述数据中的待接收数据单元的序列号和所述汇聚端装置 已接收数据单元的最大序列号;
若所述待接收数据单元的序列号与所述已接收数据单元的最大 序列号之间的间隔满足预设差值条件, 则确定所述待接收数据单元 的序列号对应的数据单元为所述汇聚端装置未接收到的所述数据单 元。
结合第六方面, 在第二种可能的实现方式中, 还包括: 确定所述数据中的待接收数据单元的序列号未发生更新的时 间; 在所述待接收数据单元的序列号未发生更新的时间满足预设时 间阈值时, 确定所述待接收数据单元的序列号对应的数据单元为所 述汇聚端装置未接收到的所述数据单元。
结合第六方面至第二种可能的实现方式中的任一种可能的实现 方式, 在第三种可能的实现方式中, 还包括:
调整所述第一链路的 R L C 层的接收窗口中的状态变量, 所述接 收窗口中的状态变量包括所述数据中的下一个待接收数据单元的序 列号和所述数据中的已接收数据单元的最大序列号。
结合第三种可能的实现方式, 在第四种可能的实现方式中, 还 包括:
指示所述第一链路调整所述第一链路的 RL C 层的发送窗口中的 状态变量。
结合第六方面至第二种可能的实现方式中的任一种可能的实现 方式, 在第五种可能的实现方式中, 还包括:
向所述分流端装置发送第一链路失败消息, 以便所述分流端装 置根据所述状态报告和所述第一链路失败消息发起第一链路删除过 程。
结合第六方面至第五种可能的实现方式中的任一种可能的实现 方式, 在第六种可能的实现方式中, 所述数据单元包括 P DC P协议数 据单元。
釆用上述方案, 分流端装置通过第一链路向汇聚端装置发送数 据, 并在确定该数据中存在该汇聚端装置未接收到的数据单元时, 该分流端装置指示该第一链路停止向该汇聚端装置传输该汇聚端装 置未接收到的数据单元, 并通过第二链路将该数据单元重传至所述 汇聚端装置。 这样, 在该第一链路的数据传输出现问题时, 该分流 端装置可以将该第一链路中未发送至汇聚端装置的数据单元切换由 传输速率更高的第二链路进行传输, 提高了数据重传的效率, 降低 重传延迟。
附图说明 为了更清楚地说明本发明实施例的技术方案, 下面将对实施例 描述中所需要使用的附图作简单地介绍, 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, 对于本领域普通技术人员来讲, 在不付出创造性劳动的前提下, 还可以根据这些附图获得其他的附 图。
图 1 为本发明实施例提供的一种分流端装置的结构示意图; 图 2为本发明实施例提供的一种汇聚端装置的结构示意图; 图 3为本发明实施例提供的另一种分流端装置的结构示意图; 图 4为本发明实施例提供的另一种汇聚端装置的结构示意图; 图 5 a为本发明实施例提供的一种基站的结构示意图;
图 5 b为本发明实施例提供的另一种基站的结构示意图; 图 6 a为本发明实施例提供的另一种基站的结构示意图; 图 6 b为本发明实施例提供的另一种基站的结构示意图; 图 7 a为本发明实施例提供的一种终端的结构示意图;
图 7 b为本发明实施例提供的另一种终端的结构示意图; 图 8 a为本发明实施例提供的另一种终端的结构示意图; 图 8 b为本发明实施例提供的另一种终端的结构示意图; 图 9 为本发明实施例提供的一种数据重传的方法的流程示意 图;
图 1 0 为本发明实施例提供的一种终端与多个基站相互通信的 系统的结构示意图;
图 1 1 为本发明实施例提供的另一种数据重传的方法的流程示 意图;
图 1 2 为本发明实施例提供的另一种数据重传的方法的流程示 意图;
图 1 3 为本发明实施例提供的另一种数据重传的方法的流程示 意图。
具体实施方式
下面将结合本发明实施例中的附图, 对本发明实施例中的技术 方案进行清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明 一部分实施例, 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他 实施例, 都属于本发明保护的范围。
本发明实施例提供一种分流端装置 1 0 , 如图 1 所示, 该分流端 装置 1 0 包括:
发送单元 1 1 , 用于通过第一链路向汇聚端装置发送数据。
指示单元 1 2 , 用于指示该第一链路停止向该汇聚端装置传输该 汇聚端装置未接收到的数据单元。
其中, 该数据包括该数据单元。
该发送单元 1 1还用于, 通过第二链路将该数据单元重传至该汇 聚端装置。
需要说明的是, 该分流端装置向该汇聚端装置发送数据时, 该 分流端装置将该数据通过该分流端装置的 PDCP层进行分流, 该分流 端装置将分流后的数据通过不同的链路发送至该汇聚端装置。
可选地, 该分流端装置为主基站, 该汇聚端装置为终端。
具体地, 终端与多个基站进行通信的系统包括一个主基站、 至 少一个辅基站和终端, 则该主基站和辅基站同时或分时向终端下行 发送的数据时, 该主基站将该数据通过该主基站的 P DCP 层进行分 流, 分流后的数据在终端的 PDCP层进行汇聚, 此时, 该分流端装置 即为该主基站, 该汇聚端装置即为该终端。
另外, 该主基站将分流后的数据通过不同的链路将分流后的数 据发送至终端, 则该第一链路可能是经过该辅基站, 并由该辅基站 将分流后的数据发送至终端的链路, 该第一链路也可能是由主基站 将分流后的数据发送至终端的链路。
可选地, 该分流端装置为终端, 该汇聚端装置为主基站。
具体地, 该终端与多个基站进行通信的系统中, 该终端向基站 上行发送的数据时, 该数据通过终端的 PDC P层进行分流, 并在主基 站的 PDCP层进行汇聚, 此时该分流端装置即为该终端, 该汇聚端装 置即为该主基站, 该第一链路可能是经过该辅基站, 并由该辅基站 将分流后的数据发送至主基站的链路, 该第一链路也可能是由终端 将分流后的数据发送至主基站的链路。
另外, 若该第一链路无重传机制, 则本发明实施例中该汇聚端 装置未接收到的数据单元即为需要切换链路传输的数据单元; 该若 该第一链路具有重传机制, 也就是说, 该汇聚端装置未接收到的数 据该第一链路会进行重新发送, 此时, 本发明实施例中所描述的该 汇聚端装置未接收到的数据单元不包括该分流端装置认为需要继续 通过该第一链路重传的数据单元。
可选地, 该分流端装置还包括确定单元 13, 用于确定该数据中 的待确认数据单元的序列号和该分流端装置中的待发送数据单元的 序列号, 若该待确认数据单元的序列号与该待发送数据单元的序列 号之间的间隔满足预设差值条件, 则确定该待确认数据单元的序列 号对应的数据单元为该汇聚端装置未接收到的该数据单元。
需要说明的是, 分流端装置的 PDCP层的发送窗口包括状态变量 VTs和状态变量 VTa, 其中, VTs表示下一个即将发送的数据单元的 序列号, VTa表示下一个期望接收到确认的数据单元的序号。
在本发明实施例的一种可能的实现方式中, 该分流端装置预设 该分流端装置的 PDCP层的发送窗口中的 VTs与 VTa之差的阈值, 若 该发送窗口中的 VTs 与 VTa之差达到该阈值, 则该分流端装置确定 该 VTa 对应的数据单元为需要切换链路传输的数据单元。 另外, 若 该第一链路经过该分流端装置的 RLC 层, 则该分流端装置也可以预 设该分流端装置的 RLC层的发送窗口中的 VTs 与 VTa之差的阈值, 若该 RLC层的发送窗口中的 VTs 与 VTa之差达到该阈值, 则该分流 端装置确定该 VTa 对应的数据单元为需要切换链路传输的数据单 元。
可选地, 该确定单元 13还用于, 确定该数据中的待确认数据单 元的序列号未发生更新的时间, 在该待确认数据单元的序列号未发 生更新的时间满足预设时间阈值时, 确定该待确认数据单元的序列 号对应的数据单元为该汇聚端装置未接收到的数据单元。
示例地, 该分流端装置对该分流端装置中的 PDCP层的发送窗口 中的 VTa设置对应的定时器, 该定时器设定时间阈值。 在该 VTa 更 新后, 该定时器启动或重启开始计时, 在该定时器计时达到该时间 阈值时, 若该 VTa还没有更新, 则该分流端装置确定该 VTa 对应的 数据单元为需要切换链路传输的数据单元。 另外, 若该第一链路经 过该分流端装置的 RLC 层, 则该发送窗口也可以是该分流端装置的 RLC层的发送窗口。
可选地, 该分流端装置还包括接收单元 14, 用于接收该汇聚端 装置发送的状态报告, 该状态报告包括该汇聚端装置在该数据中未 接收到的数据单元的序列号的指示信息, 则该确定单元 13还用于, 根据该指示信息确定该汇聚端装置未接收到的该数据单元。
需要说明的是, 该状态报告可以为 PDCP状态报告, 该数据单元 即为 PDCP协议数据单元, 其中, 该 PDCP状态报告可能作为特殊的 MAC控制单元优先在空口发送。 该 PDCP状态报告有可能是汇聚端装 置或第一链路发送端在辅基站无线链路失败后触发的。 这时, 分流 端装置将接收到辅基站无线链路失败的指示消息。 分流端装置在接 收到该失败指示消息后, 将触发辅基站删除过程。
具体地, 该分流端装置可以向该汇聚端装置发送 PDCP轮询请求 消息, 并接收该汇聚端装置根据该 PDCP 轮询请求消息发送的 PDCP 状态报告; 该分流端装置也可以接收该汇聚端装置自身触发的 PDCP 状态报告。
其中, 汇聚端装置的 PDCP层的接收窗口包括状态变量 VRr和状 态变量 VRh, 其中, 该 VRr 表示下一个期望接收到的数据单元的序 列号, 该 VRh表示在接收到的数据单元中最大序列号的下一个序列 号。
则该汇聚端装置可以在接收窗口中的 VRr 与该 VRh之间的差值 满足预设差阈值时, 确定该 VRr 对应的数据单元为需要切换链路传 输的数据单元; 该汇聚端装置也可以在该 VRr 未发生更新的时间满 足预设时间阈值时, 确定该 VRr 对应的数据单元为需要切换链路传 输的数据单元。 并通过 PDCP状态报告将该需要切换链路传输的数据 单元的序列号发送至该分流端装置。
进一步地, 在确定该第一链路传输的数据中需要切换链路传输 的数据单元后, 指示该第一链路停止传输该数据单元。
可选地, 该发送单元 11还用于, 向该第一链路的 RLC层发送切 换链路消息,该切换链路消息包括该数据单元的全部序列号中的最 大序列号的指示信息, 以便该 RLC 层根据该最大序列号的指示信息 停止传输该最大序列号对应的数据单元以及序列号小于该最大序列 号的数据单元。
示例地, 若该第一链路为分流端装置直接发送数据至终端的链 路, 则该分流端装置在确定该第一链路传输的数据中需要切换链路 传输的数据单元后, 该分流端装置停止传输该最大序列号对应的 PDCP 协议数据单元以及序列号小于该最大序列号的 PDCP 协议数据 单元, 若该 PDCP层已经将数据单元已经递交给 RLC层, 则发送切换 链路消息至该 RLC 层, 该切换链路消息包括该数据单元的全部序列 号中的最大序列号, 以便该 RLC 层根据该切换链路消息停止传输该 最大序列号对应的 RLC 协议数据单元及序列号小于该最大序列号的 RLC协议数据单元。
可选地,该分流端装置还包括处理单元 15,若该第一链路的 RLC 层釆用非确认模式,则该处理单元 15 用于, 调整该第一链路的 RLC 层的发送窗口中的状态变量。
其中, 该发送窗口中的状态变量包括该数据中的下一个待发送 数据单元的序列号。
示例地, 该分流端装置在指示该第一链路停止传输该数据单元 之前, 该 RLC 层的发送窗口中的 VTs 为 5, 若该第一链路中需要切 换链路传输的数据单元的全部序列号中的最大序列号为 5, 则在该 分流端装置在指示该第一链路停止传输该数据单元之后,由于该 RLC 层停止传输序列号小于等于 5 的全部数据单元, 因此该 RLC层的下 一个待发送的数据单元为序列号大于 5的数据单元 , 如序列号为 8 的数据单元, 则该分流端装置指示该 RLC层将发送窗口中的 VTs 由 5更新为 8。
可选地, 该处理单元 15还用于, 若该第一链路的 RLC层釆用确 认模式, 调整该第一链路中的 RLC层的发送窗口中的状态变量,该指 示单元 12还用于, 指示该第一链路调整该第一链路的 RLC层的接收 窗口中的状态变量。
其中, 该发送窗口中的状态变量包括该数据中的下一个待确认 数据单元的序列号和该数据中的下一个待发送数据单元的序列号。
需要说明的是, 该第一链路中的 RLC 层包括发送端和接收端, 该 RLC 层在确认模式下, RLC 层的发送端在向接收端发送数据后, 可以要求接收端反馈是否正确接收, 因此, 该 RLC 层的发送窗口中 的下一个待确认数据单元的序列号与该 RLC 层接收窗口中的下一个 期望接收到的数据单元的序列号相对应,则该分流端装置在调整 RLC 层的发送窗口后, 向该接收端发送 RLC 控制消息, 指示接收端根据 该 RLC控制消息对 RLC层的接收窗口进行相应的调整。 以便该分流 端装置继续通过该第一链路向该汇聚端装置发送除该需要切换链路 传输的数据单元之外的数据。
可选地, 该接收单元 14还用于, 接收第一链路失败消息, 该处 理单元 15 还用于, 根据该第一链路失败消息发起第一链路删除过 程。
其中, 该第一链路失败消息包括该汇聚端装置发送的第一链路 失败消息或者该第一链路对应的发送装置发送的第一链路失败消 息。
示例地, 该分流端装置在接收到该第一链路反馈的第一链路失 败消息后, 停止通过该第一链路向该汇聚端装置发送数据, 并将该 数据中未发送至该汇聚端装置的数据单元切换链路重传至该汇聚端 装置。 其中, 若该第一链路不经过辅基站, 则该第一链路失败消息 由终汇聚端装置发送, 若该第一链路经过辅基站, 则该第一链路失 败消息可以由汇聚端装置发送, 也可以由该辅基站发送。
釆用上述分流端装置, 该分流端装置通过第一链路向汇聚端装 置发送数据, 并在确定该数据中存在该汇聚端装置未接收到的数据 单元时, 该分流端装置指示该第一链路停止向该汇聚端装置传输该 汇聚端装置未接收到的数据单元, 并通过第二链路将该数据单元重 传至所述汇聚端装置。 这样, 在该第一链路的数据传输出现问题时, 该分流端装置可以将该第一链路中未发送至汇聚端装置的数据单元 切换由传输速率更高的第二链路进行传输, 提高了数据重传的效率, 降低重传延迟。 本发明实施例提供一种汇聚端装置 2 0 , 如图 2所示, 该汇聚端 装置 2 0 包括:
发送单元 2 1 , 用于向分流端装置发送指示该汇聚端装置未接收 到的数据单元的状态报告, 以便该分流端装置根据该状态报告指示 第一链路停止向该汇聚端装置传输该数据单元, 并通过第二链路将 该数据单元重传至该汇聚端装置。
其中, 该状态报告包含该数据单元的序列号的指示信息, 该分 流端装置通过该第一链路向该汇聚端装置发送的数据包括该数据单 元。
具体地, 该分流端装置通过第一链路向该汇聚端装置发送数据, 该分流端装置将该数据通过该分流端装置的 P D C P层进行分流, 该分 流端装置将分流后的数据通过不同的链路发送至该汇聚端装置。
可选地, 该分流端装置为主基站, 该汇聚端装置为终端。
具体地, 终端与多个基站进行通信的系统包括一个主基站、 至 少一个辅基站和终端, 则该主基站和辅基站同时或分时向终端下行 发送的数据时, 该主基站将该数据通过该主基站的 P DC P 层进行分 流, 分流后的数据在终端的 P DC P层进行汇聚, 此时, 该分流端装置 即为该主基站, 该汇聚端装置即为该终端。
另外, 该主基站将分流后的数据通过不同的链路将分流后的数 据发送至终端, 则该第一链路可能是经过该辅基站, 并由该辅基站 将分流后的数据发送至终端的链路, 该第一链路也可能是由主基站 将分流后的数据发送至终端的链路。
可选地, 该分流端装置为终端, 该汇聚端装置为主基站。
具体地, 该终端与多个基站进行通信的系统中, 该终端向基站 上行发送的数据时, 该数据通过终端的 P DC P层进行分流, 并在主基 站的 P DC P层进行汇聚, 此时该分流端装置即为该终端, 该汇聚端装 置即为该主基站, 该第一链路可能是经过该辅基站, 并由该辅基站 将分流后的数据发送至主基站的链路, 该第一链路也可能是由终端 将分流后的数据发送至主基站的链路。
进一步地, 该汇聚端装置在向该分流端装置发送该状态报告之 前, 确定该汇聚端装置未接收到的数据单元。
需要说明的是, 若该第一链路无重传机制, 则本发明实施例中 所确定的该汇聚端装置在该数据中未接收到的数据单元即为需要切 换链路传输的数据单元; 该若该第一链路具有重传机制, 也就是说, 该汇聚端装置在未接收到的数据该第一链路会进行重新发送, 此时, 本发明实施例中所确定的该汇聚端装置在该数据中未接收到的数据 单元不包括该汇聚端装置认为需要继续通过该第一链路重传的数据 单元。
可选地, 该汇聚端装置还包括确定单元 2 2 , 用于确定该数据中 的待接收数据单元的序列号和该汇聚端装置已接收数据单元的最大 序列号, 若该待接收数据单元的序列号与该已接收数据单元的最大 序列号之间的间隔满足预设差值条件, 则确定该待接收数据单元的 序列号对应的数据单元为该汇聚端装置未接收到的数据单元。
其中, 该数据单元为 P D C P协议数据单元, 该汇聚端装置向该分 流端装置发送状态报告为 P DC P状态报告。
在本发明实施例的一种可能的实现方式中, 该汇聚端装置预设 该汇聚端装置的 P DC P层的接收窗口中的 V Rh与 VR r之差的阈值, 若 该接收窗口中的 VRh与 VR r之差达到该阈值, 则该汇聚端装置确定 该 VRr对应的数据单元为需要切换链路传输的数据单元。
在本发明实施例的另一种可能的实现方式中, 若该第一链路经 过该汇聚端装置的 RLC 层, 则该汇聚端装置也可以预设该汇聚端装 置的 RLC层对应的发送窗口中的 VRh与 VRr之差的阈值, 若该 RLC 层的该发送窗口中的 VRh与 VRr之差达到该阈值, 则该 RLC层指示 该汇聚端装置的 PDCP层该 VRr对应的数据单元为需要切换链路传输 的数据单元, 从而触发该 PDCP生成 PDCP状态报告。
可选地, 该确定单元 22用于, 确定该数据中的待接收数据单元 的序列号未发生更新的时间, 则在该待接收数据单元的序列号未发 生更新的时间满足预设时间阈值时, 确定该待接收数据单元的序列 号对应的数据单元为该汇聚端装置未接收到的数据单元。
示例地, 该汇聚端装置对该汇聚端装置中的 DPCP层的接收窗口 中的 VRr设置对应的定时器, 该定时器设定时间阈值。 在该 VRr 更 新后, 该定时器启动或重启开始计时, 在该定时器计时达到该时间 阈值时, 若该 VRr还没有更新, 则该汇聚端装置确定该 VRr 对应的 数据单元为需要切换链路传输的数据单元。 另外, 若该第一链路经 过该汇聚端装置的 RLC 层, 则该接收窗口也可以是该汇聚端装置中 对应该第一链路的 RLC层的接收窗口, 由该 RLC层指示该汇聚端装 置的 PDCP 层该 VRr 对应的数据单元为需要切换链路传输的数据单 元, 从而触发该 PDCP生成 PDCP状态报告。
可选地, 该发送单元 21还用于, 向该分流端装置发送第一链路 失败消息, 以便该分流端装置根据该状态报告和该第一链路失败消 息发起第一链路删除过程。
示例地, 该分流端装置在接收到该第一链路反馈的第一链路失 败消息后, 停止通过该第一链路向该汇聚端装置发送数据, 并将该 数据中未发送至该汇聚端装置的数据单元切换链路重传至该汇聚端 装置。
可选地, 该汇聚端装置还包括处理单元 23, 用于在确定该汇聚 端装置未接收到的数据单元之后, 调整该第一链路的 RLC 层的接收 窗口中的状态变量。
其中, 该接收窗口中的状态变量包括该数据中的下一个待接收 数据单元的序列号和该数据中的已接收数据单元的最大序列号。
需要说明的是, 该第一链路中的 RLC 层包括发送端和接收端, 该 RLC 层在确认模式下, RLC 层的发送端在向接收端发送数据后, 可以要求接收端反馈是否正确接收, 因此, 该 RLC 层的发送窗口中 的下一个待确认数据单元的序列号与该 RLC 层接收窗口中的下一个 期望接收到的数据单元的序列号相对应。
在本发明实施例一种可能的实现方式中, 该汇聚端装置在向分 流端装置发送 PDCP 状态报告后, 由该分流端装置向该第一链路的 RLC层发送 RLC控制消息, 以便该 RLC层根据该 RLC控制消息调整 该 RLC层的发送窗口中的状态变量。
可选地, 该汇聚端装置还包括指示单元 24, 用于在该调整该第 一链路中的 RLC 层的接收窗口中的状态变量之后, 指示该第一链路 调整该第一链路的 RLC 层的发送窗口中的状态变量。 也就是说, 由 该汇聚端装置在调整该第一链路中的 RLC 层的接收窗口中的状态变 量之后发送 RLC控制消息, 以便该 RLC层根据该 RLC控制消息调整 该 RLC层的发送窗口中的状态变量。
釆用上述汇聚端装置, 分流端装置通过第一链路向该汇聚端装 置发送数据, 该汇聚端装置向该分流端装置发送指示该汇聚端装置 未接收到的数据单元的状态报告, 以便该分流端装置根据该状态报 告指示第一链路停止向该汇聚端装置传输该数据单元, 并通过第二 链路将该数据单元重传至该汇聚端装置。 这样, 在该第一链路的数 据传输出现问题时, 该汇聚端装置可以通知分流端装置将该第一链 路中未发送至汇聚端装置的数据单元切换由传输速率更高的第二链 路进行传输, 提高了数据重传的效率, 降低重传延迟。 本发明实施例提供一种分流端装置 30, 如图 3所示, 该分流端 处理器( processor )31、通信接口 ( Commun i ca tions Interface ) 32、 存储器 ( memory ) 33 和通信总线 34; 其中, 所述处理器 31、 所述通信接口 32和所述存储器 33通过所述通信总线 34完成相互间 的通信。
处理器 31可能是一个多核中央处理器 CPU, 或者是特定集成电 路 ASIC ( Application Specific Integrated Circuit ) , 或者是被 配置成实施本发明实施例的一个或多个集成电路。
存储器 33用于存放程序代码, 所述程序代码包括计算机操作指 令和网络流图。 存储器 33可能包含高速 RAM存储器, 也可能还包括 非易失性存储器 ( non- volatile memory ), 例如至少一个磁盘存储 器。 存储器 33也可以是存储器阵列。 存储器 33还可能被分块, 并 且所述块可按一定的规则组合成虚拟卷。
所述通信接口 32, 用于实现这些装置之间的连接通信。
所述处理器 31 用于执行所述存储器 33 中的程序代码, 以实现 以下操作:
通过第一链路向汇聚端装置发送数据;
指示所述第一链路停止向所述汇聚端装置传输所述汇聚端装置 未接收到的数据单元, 所述数据包括所述数据单元;
通过第二链路将所述数据单元重传至所述汇聚端装置。
可选地, 所述操作还包括, 确定所述数据中的待确认数据单元 的序列号和所述分流端装置中的待发送数据单元的序列号;
若所述待发送数据单元的序列号与所述待确认数据单元的序列 号之间的间隔满足预设差值条件, 则确定所述待确认数据单元的序 列号对应的数据单元为所述汇聚端装置未接收到的所述数据单元。
可选地, 所述操作还包括, 确定所述数据中的待确认数据单元 的序列号未发生更新的时间;
在所述待确认数据单元的序列号未发生更新的时间满足预设时 间阈值时, 确定所述待确认数据单元的序列号对应的数据单元为所 述汇聚端装置未接收到的所述数据单元。 可选地, 所述操作还包括, 接收所述汇聚端装置发送的状态报 告, 所述状态报告包含所述汇聚端装置在所述数据中未接收到的数 据单元的序列号的指示信息;
根据所述指示信息确定所述汇聚端装置未接收到的所述数据单 元。
可选地, 所述指示所述第一链路停止向所述汇聚端装置传输所 述汇聚端装置未接收到的数据单元具体包括:
向所述第一链路的 RL C 层发送切换链路消息, 所述切换链路消 息包括所述数据单元的全部序列号中的最大序列号的指示信息, 以 便所述 R L C 层根据所述最大序列号的指示信息停止传输所述最大序 列号对应的数据单元以及序列号小于所述最大序列号的数据单元。
可选地, 若所述第一链路的 RL C层釆用确认模式,所述操作还包 括:
调整所述第一链路的 R L C 层的发送窗口中的状态变量, 所述发 送窗口中的状态变量包括所述数据中的下一个待确认数据单元的序 列号和所述数据中的下一个待发送数据单元的序列号;
指示所述第一链路调整所述第一链路的 RL C 层的接收窗口中的 状态变量。
可选地, 若所述第一链路的 RL C层釆用非确认模式,所述操作还 包括:
调整所述第一链路的 R L C 层的发送窗口中的状态变量; 所述发 送窗口中的状态变量包括所述数据中的下一个待发送数据单元的序 列号。
可选地, 所述操作还包括, 接收第一链路失败消息; 根据所述 第一链路失败消息发起第一链路删除过程。
可选地, 所述数据单元为 P DC P协议数据单元。
可选地, 该分流端装置为主基站, 该汇聚端装置为终端。
具体地, 终端与多个基站进行通信的系统包括一个主基站、 至 少一个辅基站和终端, 则该主基站和辅基站同时或分时向终端下行 发送的数据时, 该主基站将该数据通过该主基站的 PDCP 层进行分 流, 分流后的数据在终端的 PDCP层进行汇聚, 此时, 该分流端装置 即为该主基站, 该汇聚端装置即为该终端。
另外, 该主基站将分流后的数据通过不同的链路将分流后的数 据发送至终端, 则该第一链路可能是经过该辅基站, 并由该辅基站 将分流后的数据发送至终端的链路, 该第一链路也可能是由主基站 将分流后的数据发送至终端的链路。
可选地, 该分流端装置为终端, 该汇聚端装置为主基站。
具体地, 该终端与多个基站进行通信的系统中, 该终端向基站 上行发送的数据时, 该数据通过终端的 PDCP层进行分流, 并在主基 站的 PDCP层进行汇聚, 此时该分流端装置即为该终端, 该汇聚端装 置即为该主基站, 该第一链路可能是经过该辅基站, 并由该辅基站 将分流后的数据发送至主基站的链路, 该第一链路也可能是由终端 将分流后的数据发送至主基站的链路。
釆用上述分流端装置, 该分流端装置通过第一链路向汇聚端装 置发送数据, 并在确定该数据中存在该汇聚端装置未接收到的数据 单元时, 该分流端装置指示该第一链路停止向该汇聚端装置传输该 汇聚端装置未接收到的数据单元, 并通过第二链路将该数据单元重 传至所述汇聚端装置。 这样, 在该第一链路的数据传输出现问题时, 该分流端装置可以将该第一链路中未发送至汇聚端装置的数据单元 切换由传输速率更高的第二链路进行传输, 提高了数据重传的效率, 降低重传延迟。 本发明实施例提供一种汇聚端装置 40, 如图 4所示, 该汇聚端 装置 40 包括:
处理器( processor )41、通信接口 ( Commun i ca tions Interface ) 42、 存储器 ( memory ) 43 和通信总线 44; 其中, 所述处理器 41、 所述通信接口 42和所述存储器 43通过所述通信总线 44完成相互间 的通信。 处理器 41可能是一个多核中央处理器 CPU, 或者是特定集成电 路 ASIC ( Application Specific Integrated Circuit ) , 或者是被 配置成实施本发明实施例的一个或多个集成电路。
存储器 43用于存放程序代码, 所述程序代码包括计算机操作指 令和网络流图。 存储器 43可能包含高速 RAM存储器, 也可能还包括 非易失性存储器 ( non- volatile memory ), 例如至少一个磁盘存储 器。 存储器 43也可以是存储器阵列。 存储器 43还可能被分块, 并 且所述块可按一定的规则组合成虚拟卷。
所述通信接口 42, 用于实现这些装置之间的连接通信。
所述处理器 41 用于执行所述存储器 43 中的程序代码, 以实现 以下操作:
向分流端装置发送指示所述汇聚端装置未接收到的数据单元的 状态报告, 以便所述分流端装置根据所述状态报告指示第一链路停 止向所述汇聚端装置传输所述数据单元, 并通过第二链路将所述数 据单元重传至所述汇聚端装置。
其中, 所述状态报告包含所述数据单元的序列号的指示信息, 所述分流端装置通过所述第一链路向所述汇聚端装置发送的数据包 括所述数据单元。
可选地, 所述操作还包括, 确定所述数据中的待接收数据单元 的序列号和所述汇聚端装置已接收数据单元的最大序列号;
若所述待接收数据单元的序列号与所述已接收数据单元的最大 序列号之间的间隔满足预设差值条件, 则确定所述待接收数据单元 的序列号对应的数据单元为所述汇聚端装置未接收到的所述数据单 元。
可选地, 所述操作还包括, 确定所述数据中的待接收数据单元 的序列号未发生更新的时间;
在所述待接收数据单元的序列号未发生更新的时间满足预设时 间阈值时, 确定所述待接收数据单元的序列号对应的数据单元为所 述汇聚端装置未接收到的所述数据单元。 可选地, 所述操作还包括, 调整所述第一链路的 RL C 层的接收 窗口中的状态变量, 所述接收窗口中的状态变量包括所述数据中的 下一个待接收数据单元的序列号和所述数据中的已接收数据单元的 最大序列号。
可选地, 所述操作还包括, 向所述分流端装置发送第一链路失 败消息, 以便所述分流端装置根据所述状态报告和所述第一链路失 败消息发起第一链路删除过程。
可选地, 在所述调整所述第一链路中的 RL C 层的接收窗口中的 状态变量之前, 所述操作还包括:
所述第一链路中的 RL C层组装并提交所有完整的 RL C业务数据 单元给汇聚端装置的 P DC P层。
可选地, 在所述调整所述第一链路中的 RL C 层的接收窗口中的 状态变量之后, 所述操作还包括:
指示所述第一链路调整所述第一链路的 RL C 层的发送窗口中的 状态变量。
可选地, 所述数据单元包括 P DC P协议数据单元。
可选地, 该分流端装置为主基站, 该汇聚端装置为终端。
具体地, 终端与多个基站进行通信的系统包括一个主基站、 至 少一个辅基站和终端, 则该主基站和辅基站同时或分时向终端下行 发送的数据时, 该主基站将该数据通过该主基站的 P DC P 层进行分 流, 分流后的数据在终端的 P DC P层进行汇聚, 此时, 该分流端装置 即为该主基站, 该汇聚端装置即为该终端。
另外, 该主基站将分流后的数据通过不同的链路将分流后的数 据发送至终端, 则该第一链路可能是经过该辅基站, 并由该辅基站 将分流后的数据发送至终端的链路, 该第一链路也可能是由主基站 将分流后的数据发送至终端的链路。
可选地, 该分流端装置为终端, 该汇聚端装置为主基站。
具体地, 该终端与多个基站进行通信的系统中, 该终端向基站 上行发送的数据时, 该数据通过终端的 P DC P层进行分流, 并在主基 站的 PDCP层进行汇聚, 此时该分流端装置即为该终端, 该汇聚端装 置即为该主基站, 该第一链路可能是经过该辅基站, 并由该辅基站 将分流后的数据发送至主基站的链路, 该第一链路也可能是由终端 将分流后的数据发送至主基站的链路。
釆用上述汇聚端装置, 分流端装置通过第一链路向该汇聚端装 置发送数据, 该汇聚端装置向该分流端装置发送指示该汇聚端装置 未接收到的数据单元的状态报告, 以便该分流端装置根据该状态报 告指示第一链路停止向该汇聚端装置传输该数据单元, 并通过第二 链路将该数据单元重传至该汇聚端装置。 这样, 在该第一链路的数 据传输出现问题时, 该汇聚端装置可以通知分流端装置将该第一链 路中未发送至汇聚端装置的数据单元切换由传输速率更高的第二链 路进行传输, 提高了数据重传的效率, 降低重传延迟。 本发明实施例提供一种基站 50, 如图 5a或 5b所示, 包括上述 图 1 (如图 5a ) 所示的分流端装置 10或者图 3 (如图 5b ) 所示的分 流端装置 30, 该分流端装置具体的描述可以参照上述图 1或图 3所 示实施例中的对应描述。
釆用上述基站, 该基站通过第一链路向汇聚端装置发送数据, 并在确定该数据中存在该汇聚端装置未接收到的数据单元时, 该基 站指示该第一链路停止向该汇聚端装置传输该汇聚端装置未接收到 的数据单元, 并通过第二链路将该数据单元重传至所述汇聚端装置。 这样, 在该第一链路的数据传输出现问题时, 该基站可以将该第一 链路中未发送至汇聚端装置的数据单元切换由传输速率更高的第二 链路进行传输, 提高了数据重传的效率, 降低重传延迟。 本发明实施例提供一种基站 60, 如图 6a 或 6b, 包括上述图 2 (如图 6a ) 所示的汇聚端装置 20 或者图 4 (如图 6b ) 所示的汇聚 端装置 40。 该汇聚端装置具体的描述可以参照上述图 2或图 4所示 实施例中的对应描述。 釆用上述基站, 分流端装置通过第一链路向该基站发送数据, 该基站向该分流端装置发送指示该基站未接收到的数据单元的状态 报告, 以便该分流端装置根据该状态报告指示第一链路停止向该基 站传输该数据单元, 并通过第二链路将该数据单元重传至该基站。 这样, 在该第一链路的数据传输出现问题时, 该基站可以通知分流 端装置将该第一链路中未发送至基站的数据单元切换由传输速率更 高的第二链路进行传输, 提高了数据重传的效率, 降低重传延迟。 本发明实施例提供一种终端 7 0 , 如图 7 a或 7 b所示, 包括上述 图 1 (如图 7 a ) 所示的分流端装置 1 0或者图 3 (如图 7 b ) 所示的分 流端装置 3 0 , 该分流端装置具体的描述可以参照上述图 1或图 3所 示实施例中的对应描述。
釆用上述终端, 该终端通过第一链路向汇聚端装置发送数据, 并在确定该数据中存在该汇聚端装置未接收到的数据单元时, 该终 端指示该第一链路停止向该汇聚端装置传输该汇聚端装置未接收到 的数据单元, 并通过第二链路将该数据单元重传至所述汇聚端装置。 这样, 在该第一链路的数据传输出现问题时, 该终端可以将该第一 链路中未发送至汇聚端装置的数据单元切换由传输速率更高的第二 链路进行传输, 提高了数据重传的效率, 降低重传延迟。
本发明实施例提供一种终端 8 0 , 如图 8 a或 8 b所示, 包括上述 图 2 (如图 8 a ) 所示的汇聚端装置 2 0或者图 4 (如图 8 b ) 所示的汇 聚端装置 4 0。 该汇聚端装置具体的描述可以参照上述图 2或图 4所 示实施例中的对应描述。
釆用上述终端, 分流端装置通过第一链路向该终端发送数据, 该终端向该分流端装置发送指示该终端未接收到的数据单元的状态 报告, 以便该分流端装置根据该状态报告指示第一链路停止向该终 端传输该数据单元, 并通过第二链路将该数据单元重传至该终端。 这样, 在该第一链路的数据传输出现问题时, 该终端可以通知分流 端装置将该第一链路中未发送至终端的数据单元切换由传输速率更 高的第二链路进行传输, 提高了数据重传的效率, 降低重传延迟。 本发明实施例提供一种数据重传的方法, 该方法应用于终端与 多个基站进行通信的系统, 如图 9所示, 该方法包括:
S901、 分流端装置通过第一链路向汇聚端装置发送数据。
需要说明的是, 终端与多个基站进行通信的系统如图 10所示, 包括至少一个辅基站、 主基站和终端, 连接关系如图 10所示。 该主 基站包括 PDCP 层、 RLC 层、 MAC ( Media Access Control , 介质访 问控制 ) 层和 PHY ( Physical Layer Device, 物理层); 该辅基站 包括 RLC层、 MAC层和 PHY层; 该终端包括 PDCP层, 以及对应该主 基站所在链路的 RLC 层、 MAC 层和 PHY 层, 以及对应该辅基站所在 链路的 RLC层、 MAC层和 PHY层。
可选地, 该分流端装置为主基站, 该汇聚端装置为终端。
具体地, 主基站和辅基站同时或分时向终端下行发送的数据时, 该主基站将该数据通过该主基站的 PDCP层进行分流, 分流后的数据 在终端的 PDCP层进行汇聚, 此时, 该分流端装置即为该主基站, 该 汇聚端装置即为该终端。
另外, 该主基站将分流后的数据通过不同的链路将分流后的数 据发送至终端, 则该第一链路可能是经过该辅基站, 并由该辅基站 将分流后的数据发送至终端的链路, 该第一链路也可能是由主基站 将分流后的数据发送至终端的链路。
可选地, 该分流端装置为终端, 该汇聚端装置为主基站。
具体地, 该终端与多个基站进行通信的系统中, 该终端向基站 上行发送的数据时, 该数据通过终端的 PDCP层进行分流, 并在主基 站的 PDCP层进行汇聚, 此时该分流端装置即为该终端, 该汇聚端装 置即为该主基站, 该第一链路可能是经过该辅基站, 并由该辅基站 将分流后的数据发送至主基站的链路, 该第一链路也可能是由终端 将分流后的数据发送至主基站的链路。
S902、 该分流端装置指示该第一链路停止向该汇聚端装置传输 该汇聚端装置未接收到的数据单元。
其中, 该数据包括该数据单元。
具体地, 该分流端装置在指示该第一链路停止向该汇聚端装置 传输该汇聚端装置未接收到的数据单元之前, 确定该汇聚端装置未 接收到的数据单元。
需要说明的是, 若该第一链路无重传机制, 则该汇聚端装置未 接收到的该数据单元即为需要切换链路传输的数据单元; 若该第一 链路具有重传机制, 也就是说, 该汇聚端装置在未接收到的数据单 元该第一链路会进行重新发送, 此时, 该汇聚端装置未接收到的该 数据单元为需要切换链路传输的数据单元, 即该数据单元不包括该 分流端装置认为需要继续通过该第一链路重传的数据单元。
具体地, 本发明实施例包括以下三种实现方式:
方式一、 该分流端装置确定该数据中的待确认数据单元的序列 号和该分流端装置中的待发送数据单元的序列号, 并在该待发送数 据单元的序列号与该待确认数据单元的序列号之间的间隔满足预设 差值条件, 确定该待确认数据单元的序列号对应的数据单元为该汇 聚端装置在该数据中未接收到的数据单元。
需要说明的是, 分流端装置的 PDCP层的发送窗口包括状态变量
VTs和状态变量 VTa, 其中, VTs表示下一个即将发送的数据单元的 序列号, VTa表示下一个期望接收到确认的数据单元的序号。
在本发明实施例的一种可能的实现方式中, 该分流端装置为主 基站, 该汇聚端装置为终端, 则该主基站预设该主基站的 PDCP层的 发送窗口中的 VTs与 VTa之差的阈值, 若该 PDCP层该发送窗口中的 VTs 与 VTa 之差达到该阈值, 则该主基站确定该 VTa 对应的数据单 元为需要切换链路传输的数据单元。
另外, 若该第一链路经过该主基站的 RLC 层, 则该主基站也可 以预设该主基站的 RLC层的发送窗口中的 VTs 与 VTa之差的阈值, 若该 RLC层的该发送窗口中的 VTs 与 VTa之差达到该阈值, 则该主 基站确定该 VTa 对应的数据单元为需要切换链路传输的数据单元; 若该第一链路为经过辅基站的链路, 则可由该辅基站通过该辅基站 中的 RLC层的发送窗口中的状态变量和 RLC协议数据单元生成信息 确定需要切换链路传输的数据单元, 并在发生切换或辅基站无线链 路失败或 RLC重建时通知该主基站。
在本发明实施例的另一种可能的实现方式中, 该分流端装置为 终端, 该汇聚端装置为主基站, 则该终端预设该终端的 PDCP层的发 送窗口中的 VTs 与 VTa 之差的阈值, 若该 PDCP 层该发送窗口中的 VTs 与 VTa 之差达到该阈值, 则该终端确定该 VTa 对应的数据单元 为需要切换链路传输的数据单元。
另外, 该终端还可以预设该终端中对应该第一链路的 RLC 层的 发送窗口中的 VTs 与 VTa之差的阈值, 若该 RLC层的该发送窗口中 的 VTs 与 VTa之差达到该阈值, 则该终端确定该 VTa对应的数据单 元为需要切换链路传输的数据单元。
方式二、 该分流端装置确定该数据中的待确认数据单元的序列 号未发生更新的时间, 并在该待确认数据单元的序列号未发生更新 的时间满足预设时间阈值时, 确定该待确认数据单元的序列号对应 的数据单元为该汇聚端装置在该数据中未接收到的数据单元。
示例地, 该分流端装置对发送窗口中的 VTa设置对应的定时器, 该定时器设定时间阈值。 在该 VTa 更新后, 该定时器启动或重启开 始计时, 在该定时器计时达到该时间阈值时, 若该 VTa还没有更新, 则该分流端装置确定该 VTa 对应的数据单元为需要切换链路传输的 数据单元。 其中, 若该分流端装置为主基站, 该汇聚端装置为终端, 则该发送窗口可以为该主基站的 PDCP层的发送窗口; 若该分流端装 置为主基站, 该汇聚端装置为终端, 该第一链路经过该主基站的 RLC 层, 该发送窗口可以为该主基站的 RLC 层的发送窗口; 若该分流端 装置为终端, 该汇聚端装置为主基站, 则该发送窗口可以为该终端 的 PDCP层对应的发送窗口或者该终端中对应该第一链路的 RLC层的 发送窗口 。
方式三、 该分流端装置接收该汇聚端装置发送的状态报告, 其 中, 该状态报告包括该汇聚端装置在该数据中未接收到的数据单元 的序列号, 则该分流端装置根据该序列号确定该汇聚端装置在该数 据中未接收到的数据单元。
可选地, 该数据单元为 PDCP协议数据单元, 该状态报告为 PDCP 状态报告。
具体地, 该分流端装置可以向该汇聚端装置发送 PDCP轮询请求 消息, 并接收该汇聚端装置根据该 PDCP 轮询请求消息发送的 PDCP 状态报告; 该分流端装置也可以接收该汇聚端装置自身触发的 PDCP 状态报告。
需要说明的是, 汇聚端装置的 PDCP层的接收窗口包括状态变量 VRr和状态变量 VRh, 其中, 该 VRr表示下一个期望接收到的数据单 元的序列号, 该 VRh表示在接收到的数据单元中最大序列号的下一 个序列号。
该汇聚端装置可以在接收窗口中的 VRr 与该 VRh之间的差值满 足预设差阈值时, 确定该 VRr 对应的数据单元为需要切换链路传输 的数据单元; 该汇聚端装置也可以在该 VRr 未发生更新的时间满足 预设时间阈值时, 确定该 VRr 对应的数据单元为需要切换链路传输 的数据单元。 其中, 若该分流端装置为主基站, 该汇聚端装置为终 端, 则该接收窗口可以为该终端中对应该第一链路的 RLC 层的接收 窗口或者该终端中的 PDCP层的接收窗口; 若该分流端装置为终端, 该汇聚端装置为主基站, 则该接收窗口可以为该主基站的 PDCP层的 接收窗口或者该第一链路经过的 RLC层的接收窗口。
方式一和方式二是分流端装置自身确定的该汇聚端装置未接收 到的数据单元; 方式三是在汇聚端装置自身确定未接收到的数据单 元后, 该分流端装置接收该汇聚端装置发送的 PDCP状态报告, 并通 过该 PDCP状态报告确定的该汇聚端装置未接收到的数据单元。
进一步地, 该分流端在指示该第一链路停止向该汇聚端装置传 输该数据单元之后, 向该第一链路中的 RLC 层发送切换链路消息, 该切换链路消息包括该数据单元的全部序列号中的最大序列号的指 示信息, 以便该 RLC 层根据该最大序列号的指示信息停止传输该最 大序列号对应的数据单元以及序列号小于该最大序列号的数据单 元。
示例地, 若该第一链路为分流端装置直接发送数据至终端的链 路, 则该分流端装置在确定该第一链路传输的数据中需要切换链路 传输的数据单元后, 该分流端装置停止传输该最大序列号对应的
PDCP 协议数据单元以及序列号小于该最大序列号的 PDCP 协议数据 单元, 若该 PDCP层已经将数据单元已经递交给 RLC层, 则发送切换 链路消息至该 RLC 层, 该切换链路消息包括该数据单元的全部序列 号中的最大序列号, 以便该 RLC 层根据该切换链路消息停止传输该 最大序列号对应的 RLC 协议数据单元及序列号小于该最大序列号的 RLC 协议数据单元; 若该第一链路是该主基站通过辅基站向该终端 发送数据的链路, 则该主基站在确定该第一链路中需要切换链路传 输的数据单元后, 向该辅基站发送切换链路消息, 指示该辅基站中 的 RLC层停止传输该最大序列号以下的序列号对应的 RLC协议数据 单元。
可选地, 该分流端装置在该指示该第一链路停止传输该数据单 元之前, 接收第一链路失败消息, 并根据该第一链路失败消息发起 第一链路删除过程。
其中, 该第一链路失败消息包括该汇聚端装置发送的第一链路 失败消息或者该第一链路对应的发送装置发送的第一链路失败消 息。
示例地, 该分流端装置在接收到该第一链路反馈的第一链路失 败消息后, 停止通过该第一链路向该汇聚端装置发送数据, 并将该 数据中未发送至该汇聚端装置的数据单元切换链路重传至该汇聚端 装置。
可选地, 若该第一链路的 RLC层釆用非确认模式,则该分流端装 置在该指示该第一链路停止传输该数据单元之后, 调整该第一链路 中的 RLC层的发送窗口中的状态变量。 其中, 该发送窗口中的状态变量包括该数据中的下一个待发送 数据单元的序列号。
示例地, 该分流端装置在指示该第一链路停止传输该数据单元 之前, 该 RLC 层的发送窗口中的 VTs 为 5, 若该第一链路中需要切 换链路传输的数据单元的全部序列号中的最大序列号为 5, 则在该 分流端装置在指示该第一链路停止传输该数据单元之后,由于该 RLC 层停止传输序列号小于等于 5 的全部数据单元, 因此该 RLC层的下 一个待发送的数据单元为序列号大于 5的数据单元 , 如序列号为 8 的数据单元, 则该分流端装置指示该 RLC层将发送窗口中的 VTs 由 5更新为 8。
可选地, 若该第一链路的 RLC层釆用确认模式,则该分流端装置 在该指示该第一链路停止传输该数据单元之后, 调整该第一链路中 的 RLC 层的发送窗口中的状态变量, 并指示该第一链路调整该第一 链路的 RLC层的接收窗口中的状态变量。
其中, 该发送窗口中的状态变量包括该数据中的下一个待确认 数据单元的序列号和该数据中的下一个待发送数据单元的序列号。
需要说明的是, 该第一链路中的 RLC 层包括发送端和接收端, 如图 10所示, 如该第一链路为经过该辅基站, 并由该辅基站将分流 后的数据发送至终端的链路, 则该辅基站中的 RLC层即为该发送端, 该终端中的 RLC层即为该接收端, 该 RLC层的发送窗口即为该辅基 站中的 RLC层的发送窗口,该 RLC层的接收窗口即为该终端中的 RLC 层的接收窗口, 若该第一链路的 RLC 层在确认模式下, RLC 层的发 送端在向接收端发送数据后, 可以要求接收端反馈是否正确接收, 因此, 该 RLC 层的发送窗口中的下一个待确认数据单元的序列号与 该 RLC 层接收窗口中的下一个期望接收到的数据单元的序列号相对 应, 则该分流端装置在调整 RLC 层的发送窗口后, 向该接收端发送 RLC控制消息, 指示接收端根据该 RLC控制消息对 RLC 层的接收窗 口进行相应的调整。 以便该分流端装置继续通过该第一链路向该汇 聚端装置发送除该需要切换链路传输的数据单元之外的数据。 S903、 该分流端装置通过第二链路将该数据单元重传至该汇聚 端装置。
示例地, 该分流端装置为终端, 该汇聚端装置为主基站, 且该 第一链路经过辅基站, 该辅基站与该汇聚端装置之间的无线网络信 号较弱导致该辅基站向该终端发送的数据中存在需要切换链路传输 的数据单元, 则该主基站在确定该数据中存在需要切换链路传输的 数据单元后, 指示该辅基站停止传输该数据单元, 并将该数据单元 通过该主基站发送至该终端, 即该第二链路为经过该主基站的链路。
另外, 若在终端与多个基站进行通信的系统中, 存在多个辅基 站, 且该第一链路为通过主基站发送该数据的链路时, 该主基站在 确定该数据中存在需要切换链路传输的数据单元后, 确定传输速率 快的辅基站, 并通过该辅基站将该数据单元发送至该终端。
需要说明的是, 本发明实施例揭示的机制适用于任何将一路数 据分流到多个链路进行传输再汇聚的场景。 比如, 它同样适用于
MP TCP ( Multi path Transmission Control Protocol , 多路径传输 控制 协议 ) 作为 分流 I汇聚协议层 , 下 面 映射到 多 个 TCP ( Transmission Control Protocol, 传输控制十办议 )或 UDP ( User Datagram Protocol, 用户数据包协议)层的场景。 再比如, 它同样 适用于 IP作为分流 /汇聚协议层, 下面映射到多个 LTE ( Long Term Evolution,长期演进技术 ) PDCP,甚至映射到 LTE PDCP和 WiFi MAC 层的场景。
釆用上述方法, 分流端装置通过第一链路向汇聚端装置发送数 据, 并在确定该数据中存在该汇聚端装置未接收到的数据单元时, 该分流端装置指示该第一链路停止向该汇聚端装置传输该汇聚端装 置未接收到的数据单元, 并通过第二链路将该数据单元重传至所述 汇聚端装置。 这样, 在该第一链路的数据传输出现问题时, 该分流 端装置可以将该第一链路中未发送至汇聚端装置的数据单元切换由 传输速率更高的第二链路进行传输, 提高了数据重传的效率, 降低 重传延迟。 本发明实施例提供另一种数据重传的方法, 该方法应用于终端 与多个基站进行通信的系统, 如图 1 1 所示, 该方法包括:
S l l l、 汇聚端装置向分流端装置发送指示该汇聚端装置未接收 到的数据单元的状态报告, 以便该分流端装置根据该状态报告指示 第一链路停止向该汇聚端装置传输该数据单元, 并通过第二链路将 该数据单元重传至该汇聚端装置。
其中, 该状态报告包含该数据单元的序列号的指示信息, 该分 流端装置通过该第一链路向该汇聚端装置发送的数据包括该数据单 元。
具体地, 该分流端装置通过第一链路向该汇聚端装置发送数据, 该分流端装置将该数据通过该分流端装置的 PDCP层进行分流, 该分 流端装置将分流后的数据通过不同的链路发送至该汇聚端装置。
可选地, 该分流端装置为主基站, 该汇聚端装置为终端。
具体地, 终端与多个基站进行通信的系统包括一个主基站、 至 少一个辅基站和终端, 则该主基站和辅基站同时或分时向终端下行 发送的数据时, 该主基站将该数据通过该主基站的 PDCP 层进行分 流, 分流后的数据在终端的 PDCP层进行汇聚, 此时, 该分流端装置 即为该主基站, 该汇聚端装置即为该终端。
另外, 该主基站将分流后的数据通过不同的链路将分流后的数 据发送至终端, 则该第一链路可能是经过该辅基站, 并由该辅基站 将分流后的数据发送至终端的链路, 该第一链路也可能是由主基站 将分流后的数据发送至终端的链路。
可选地, 该分流端装置为终端, 该汇聚端装置为主基站。
具体地, 该终端与多个基站进行通信的系统中, 该终端向基站 上行发送的数据时, 该数据通过终端的 PDCP层进行分流, 并在主基 站的 PDCP层进行汇聚, 此时该分流端装置即为该终端, 该汇聚端装 置即为该主基站, 该第一链路可能是经过该辅基站, 并由该辅基站 将分流后的数据发送至主基站的链路, 该第一链路也可能是由终端 将分流后的数据发送至主基站的链路。
进一步地, 该汇聚端装置在向该分流端装置发送该状态报告之 前, 确定该汇聚端装置未接收到的数据单元。
需要说明的是, 若该第一链路无重传机制, 则本发明实施例中 所确定的该汇聚端装置在该数据中未接收到的数据单元即为需要切 换链路传输的数据单元; 该若该第一链路具有重传机制, 也就是说, 该汇聚端装置在未接收到的数据该第一链路会进行重新发送, 此时, 本发明实施例中所确定的该汇聚端装置在该数据中未接收到的数据 单元不包括该汇聚端装置认为需要继续通过该第一链路重传的数据 单元。
可选地, 该汇聚端装置确定该数据中的待接收数据单元的序列 号和该汇聚端装置已接收数据单元的最大序列号, 若该待接收数据 单元的序列号与该已接收数据单元的最大序列号之间的间隔满足预 设差值条件, 则确定该待接收数据单元的序列号对应的数据单元为 该汇聚端装置未接收到的数据单元。
可选地, 该数据单元为 PDCP协议数据单元, 该汇聚端装置向该 分流端装置发送状态报告为 PDC P状态报告。
在本发明实施例的一种可能的实现方式中, 该汇聚端装置预设 该汇聚端装置的 PDC P层的接收窗口中的 VRh与 VR r之差的阈值, 若 该接收窗口中的 VRh与 VR r之差达到该阈值, 则该汇聚端装置确定 该 VR r对应的数据单元为需要切换链路传输的数据单元。
在本发明实施例的另一种可能的实现方式中, 若该第一链路经 过该汇聚端装置的 RL C 层, 则该汇聚端装置也可以预设该汇聚端装 置的 RLC层对应的发送窗口中的 VRh与 VR r之差的阈值, 若该 RLC 层的该发送窗口中的 VRh与 VR r之差达到该阈值, 则该 RL C层指示 该汇聚端装置的 P DCP层该 VR r对应的数据单元为需要切换链路传输 的数据单元, 从而触发该 PDCP生成 PDCP状态报告。
可选地, 该汇聚端装置确定该数据中的待接收数据单元的序列 号未发生更新的时间, 并在该待接收数据单元的序列号未发生更新 的时间满足预设时间阈值时, 确定该待接收数据单元的序列号对应 的数据单元为该汇聚端装置未接收到的数据单元。
示例地, 该汇聚端装置对该汇聚端装置中的 DPCP层的接收窗口 中的 VRr设置对应的定时器, 该定时器设定时间阈值。 在该 VRr 更 新后, 该定时器启动或重启开始计时, 在该定时器计时达到该时间 阈值时, 若该 VRr还没有更新, 则该汇聚端装置确定该 VRr 对应的 数据单元为需要切换链路传输的数据单元。 另外, 若该第一链路经 过该汇聚端装置的 RLC 层, 则该接收窗口也可以是该汇聚端装置中 对应该第一链路的 RLC层的接收窗口, 由该 RLC层指示该汇聚端装 置的 PDCP 层该 VRr 对应的数据单元为需要切换链路传输的数据单 元, 从而触发该 PDCP生成 PDCP状态报告。
可选地, 该汇聚端装置向该分流端装置发送第一链路失败消息, 以便该分流端装置根据该状态报告和该第一链路失败消息发起第一 链路删除过程。
示例地, 该分流端装置在接收到该第一链路反馈的第一链路失 败消息后, 停止通过该第一链路向该汇聚端装置发送数据, 并将该 数据中未发送至该汇聚端装置的数据单元切换链路重传至该汇聚端 装置。
需要说明的是, 该第一链路中的 RLC 层包括发送端和接收端, 该 RLC 层在确认模式下, RLC 层的发送端在向接收端发送数据后, 可以要求接收端反馈是否正确接收, 因此, 该 RLC 层的发送窗口中 的下一个待确认数据单元的序列号与该 RLC 层接收窗口中的下一个 期望接收到的数据单元的序列号相对应。
则在本发明实施例一种可能的实现方式中, 该汇聚端装置在确 定该汇聚端装置未接收到的数据单元之后,调整该第一链路中的 RLC 层的接收窗口中的状态变量, 且该分流端装置在接收到该汇聚端发 送的该 PDCP报告后, 向该第一链路中的 RLC层发送 RLC控制消息, 以便所述 RLC层根据该 RLC控制消息调整该 RLC层的发送窗口中的 状态变量。 在本发明实施例另一种可能的实现方式中, 该汇聚端装置在该 调整该第一链路中的 RLC 层的接收窗口中的状态变量之后, 指示该 第一链路调整该第一链路的 RLC 层的发送窗口中的状态变量。 也就 是说, 由该汇聚端装置在调整该第一链路中的 RLC 层的接收窗口中 的状态变量之后发送 RLC控制消息, 以便该 RLC层根据该 RLC控制 消息调整该 RL C层的发送窗口中的状态变量。
釆用上述方法, 分流端装置通过第一链路向该汇聚端装置发送 数据, 该汇聚端装置向该分流端装置发送指示该汇聚端装置未接收 到的数据单元的状态报告, 以便该分流端装置根据该状态报告指示 第一链路停止向该汇聚端装置传输该数据单元, 并通过第二链路将 该数据单元重传至该汇聚端装置。 这样, 在该第一链路的数据传输 出现问题时, 该汇聚端装置可以通知分流端装置将该第一链路中未 发送至汇聚端装置的数据单元切换由传输速率更高的第二链路进行 传输, 提高了数据重传的效率, 降低重传延迟。 为了使本领域技术人员能够更清楚地理解本发明实施例提供的 技术方案, 下面通过具体的实施例, 对本发明实施例提供的另一种 数据重传的方法进行详细说明, 如图 1 2所示, 该方法是以主基站作 为分流端装置, 终端作为汇聚端装置, 且该第一链路为经过辅基站 的链路进行说明的, 包括:
S 1 2 0 K 主基站向辅基站发送数据。
S 1 2 02 , 该辅基站向该终端发送该数据。
具体地, 基站向终端下行发送的数据在主基站的 PDCP层分流, 分流后的数据通过该辅基站发送至终端的链路即为第一链路。
S 1 2 0 3、 该终端根据接收窗口中的状态变量确定该数据中需要切 换链路传输的数据单元。
具体地, 该终端端可以在接收窗口中的 VR r 与该 VRh之间的差 值满足预设差阈值时, 确定该 VR r 对应的数据单元为需要切换链路 传输的数据单元, 也可以在该 VR r 未发生更新的时间满足预设时间 阈值时, 确定该 VRr 对应的数据单元为需要切换链路传输的数据单 元。 其中, 该接收单元可以为该终端中对应该第一链路的 RLC 层的 接收窗口, 也可以为该终端中的 PDCP层的接收窗口。
S1204 , 该主基站向该终端发送 PDCP轮询请求消息。
S1205 , 该终端根据该 PDCP轮询请求消息向该主基站发送 PDCP 状态报告。
S1206 , 该主基站根据该 PDCP 状态报告确定该数据中需要切换 链路传输的数据单元。
具体地, 该 PDCP状态报告中包括该数据中需要切换链路传输的 数据单元的序列号, 则该主基站通过该序列号确定对应的数据单元。
S1207 , 该主基站向该辅基站发送切换链路消息。
其中, 该切换链路消息包括需要切换链路传输的数据单元的全 部序列号中的最大序列号。
S1208 , 该辅基站根据该切换链路消息停止传输该数据单元。 具体地, 该辅基站在接收到该切换链路消息后, 停止传输上述 最大序列号对应的数据单元以及序列号小于该最大序列号的数据单 元。
S1209 , 该主基站将该数据单元通过第二链路发送至该终端。 具体地, 该主基站在确定该辅基站发送的数据中存在需要切换 链路传输的数据单元时, 该主基站将该数据单元通过第二链路重传 至该终端。
需要说明的是, 主基站在确定辅基站存在需要切换链路传输的 数据单元时, 该主基站将该数据单元通过自身发送至该终端, 若该 主基站存在需要切换链路传输的数据单元时, 该主基站可以切换由 传输速率高的辅基站将该数据单元重传至该终端。
S1210, 该辅基站调整该辅基站的 RLC层的发送窗口中的状态变 量。
示例地, 该辅基站的 RLC层在停止传输该数据单元之前, 该 RLC 层的发送窗口中的 VTs 为 5, 若该第一链路中需要切换链路传输的 数据单元的全部序列号中的最大序列号为 5, 则在该辅基站停止传 输该数据单元之后, 由于该 RLC层停止传输序列号小于等于 5 的全 部数据单元, 因此该 RLC 层的下一个待发送的数据单元为序列号大 于 5 的数据单元 , 如序列号为 8 的数据单元, 则该辅基站指示该 RLC层将发送窗口中的 VTs 由 5更新为 8。
需要说明的是, 若该 RLC 层在确认模式下, RLC 层的发送端在 向接收端发送数据后, 可以要求接收端反馈是否正确接收, 则该 RLC 层的发送窗口中的下一个待确认数据单元的序列号与该 RLC 层接收 窗口中的下一个期望接收到的数据单元的序列号相对应。 此时, 需 执行以下步骤 S1211 至步骤 S 1212。
S1211、 该辅基站向该终端发送 RLC控制消息。
S1212, 该终端根据该 RLC控制消息调整该终端中对应该第一链 路的 RLC 层的接收窗口中的接收变量, 以便该辅基站继续正常向该 终端发送除需要切换链路传输的数据单元之外的数据。
需要说明的是, 步骤 S1210 至步骤 S1212是由主基站发送切换 链路消息通知辅基站调整该辅基站的 RLC 层的发送窗口, 再由该辅 基站发送 RLC 控制消息通知该终端相应调整该终端中对应该第一链 路的 RLC 层的接收窗口, 其中, 在本发明实施例另一种可能的实现 方式中, 该终端在确定该数据中需要切换链路传输的数据单元后, 可以指示该终端中的 RLC 层调整接收窗口的状态变量, 并向辅基站 发送 RLC控制消息通知该辅基站相应调整该辅基站中的 RLC层的发 送窗口 。
这样, 在该辅基站的数据传输出现问题时, 该主基站可以将该 辅基站中需要切换链路传输的数据单元切换由传输速率更高的第二 链路进行传输, 提高了数据重传的效率, 降低重传延迟。
另外, 对于上述方法实施例, 为了简单描述, 故将其都表述为 一系列的动作组合, 但是本领域技术人员应该知悉, 本发明并不受 所描述的动作顺序的限制, 其次, 本领域技术人员也应该知悉, 说 明书中所描述的实施例均属于优选实施例, 所涉及的动作和模块并 不一定是本发明所必须的。 为了使本领域技术人员能够更清楚地理解本发明实施例提供的 技术方案, 下面通过具体的实施例, 对本发明实施例提供的另一种 数据重传的方法进行详细说明, 如图 13所示, 该方法是以终端作为 分流端装置, 主基站作为汇聚端装置, 且该第一链路为经过辅基站 的链路进行说明的, 包括:
S130K 终端向辅基站发送数据。
S1302 , 该辅基站向该主基站发送该数据。
具体地, 终端向基站上行发送的数据在该终端的 PDCP层分流, 分流后的数据通过该辅基站发送至主基站的链路即为第一链路。
S1303 , 该终端根据 PDCP 层的发送窗口中的状态变量确定该数 据中需要切换链路传输的数据单元。
可选地, 该终端预设该终端的 PDCP层或者 RLC层的发送窗口中 的 VTs 与 VTa之差的阈值, 若该发送窗口中的 VTs 与 VTa之差达到 该阈值, 则该终端确定该 VTa 对应的数据单元为需要切换链路传输 的数据单元。
可选地, 该终端对该终端的 PDCP层或者 RLC层的发送窗口中的 VTa设置对应的定时器, 该定时器设定时间阈值。 在该 VTa更新后, 该定时器启动或重启开始计时, 在该定时器计时达到该时间阈值时, 若该 VTa还没有更新, 则该终端确定该 VTa 对应的数据单元为需要 切换链路传输的数据单元。
S1304 , 该终端指示该第一链路停止传输该数据单元。
该终端在在确定该数据中需要切换链路传输的数据单元后, 该 终端中的 PDCP层停止向该第一链路的 RLC发送该 PDCP协议数据单 元, 则该 PDCP层停止通过该第一链路传输该最大序列号对应的数据 单元以及序列号小于该最大序列号的数据单元, 若该 PDCP层已将该 数据单元递交至 RLC层, 则向该终端的 RLC层发送切换链路消息, 其中, 该切换链路消息包括需要切换链路传输的数据单元的全部序 列号中的最大序列号, 则该 RLC 层停止通过该第一链路传输该最大 序列号对应的 RLC 协议数据单元以及序列号小于该最大序列号的 RLC协议数据单元。
S1305 , 该终端调整该终端中对应该第一链路的 RLC层的发送窗 口中的状态变量。
S1306、 该终端向该辅基站发送 RLC控制消息。
S1307、 该辅基站根据该 RLC控制消息调整该辅基站中的 RLC层 的接收窗口中的状态变量, 以便该终端继续通过该第一链路传输除 需要切换链路传输的数据单元之外的数据。
具体地, 该终端在调整该终端中对应该第一链路的 RLC 层的发 送窗口后, 通过向该辅基站发送 RLC控制消息, 以告知该辅基站 RLC 层发送窗口的调整情况,以使该辅基站相应的调整该辅基站中的 RLC 层的接收窗口。
S1308 , 该终端通过第二链路将该需要切换链路传输的数据单元 发送至该主基站。
另外, 对于上述方法实施例, 为了简单描述, 故将其都表述为 一系列的动作组合, 但是本领域技术人员应该知悉, 本发明并不受 所描述的动作顺序的限制, 其次, 本领域技术人员也应该知悉, 说 明书中所描述的实施例均属于优选实施例, 所涉及的动作和模块并 不一定是本发明所必须的。
这样, 在该辅基站的数据传输出现问题时, 该终端可以将该辅 基站中需要切换链路传输的数据单元切换由传输速率更高的第二链 路进行传输, 提高了数据重传的效率, 降低重传延迟。
以上所述, 仅为本发明的具体实施方式, 但本发明的保护范围 并不局限于此, 任何熟悉本技术领域的技术人员在本发明揭露的技 术范围内, 可轻易想到的变化或替换, 都应涵盖在本发明的保护范 围之内。 因此, 本发明的保护范围应以权利要求的保护范围为准。

Claims

权 利 要 求 书
1、 一种分流端装置, 其特征在于, 包括:
发送单元, 用于通过第一链路向汇聚端装置发送数据;
指示单元, 用于指示所述第一链路停止向所述汇聚端装置传输 所述汇聚端装置未接收到的数据单元,所述数据包括所述数据单元; 所述发送单元还用于, 通过第二链路将所述数据单元重传至所 述汇聚端装置。
2、 根据权利要求 1所述的分流端装置, 其特征在于, 所述分流 端装置还包括确定单元, 用于确定所述数据中的待确认数据单元的 序列号和所述分流端装置中的待发送数据单元的序列号;
若所述待确认数据单元的序列号与所述待发送数据单元的序列 号之间的间隔满足预设差值条件, 则确定所述待确认数据单元的序 列号对应的数据单元为所述汇聚端装置未接收到的所述数据单元。
3、 根据权利要求 1所述的分流端装置, 其特征在于, 所述分流 端装置还包括确定单元, 用于确定所述数据中的待确认数据单元的 序列号未发生更新的时间;
在所述待确认数据单元的序列号未发生更新的时间满足预设时 间阈值时, 确定所述待确认数据单元的序列号对应的数据单元为所 述汇聚端装置未接收到的所述数据单元。
4、 根据权利要求 1所述的分流端装置, 其特征在于, 所述分流 端装置还包括接收单元,用于接收所述汇聚端装置发送的状态报告, 所述状态报告包含所述汇聚端装置在所述数据中未接收到的数据单 元的序列号的指示信息;
所述分流端装置还包括确定单元, 用于根据所述指示信息确定 所述汇聚端装置未接收到的所述数据单元。
5、根据权利要求 1至 4任一项所述的分流端装置,其特征在于, 所述发送单元还用于, 向所述第一链路中的无线链路控制 RLC层发 送切换链路消息, 所述切换链路消息包括所述数据单元的全部序列 号中的最大序列号的指示信息, 以便所述 RLC层根据所述最大序列 号的指示信息停止传输所述最大序列号对应的数据单元以及序列号 小于所述最大序列号的数据单元。
6、根据权利要求 1至 5任一项所述的分流端装置,其特征在于, 所述分流端装置还包括处理单元, 若所述第一链路的 RLC层釆用确 认模式, 则所述处理单元用于, 调整所述第一链路的 RLC层的发送 窗口中的状态变量, 所述发送窗口中的状态变量包括所述数据中的 下一个待确认数据单元的序列号和所述数据中的下一个待发送数据 单元的序列号;
所述指示单元还用于, 指示所述第一链路调整所述第一链路的
RLC层的接收窗口中的状态变量。
7、根据权利要求 1至 5任一项所述的分流端装置,其特征在于, 所述分流端装置还包括处理单元, 若所述第一链路的 RLC层釆用非 确认模式, 则所述处理单元用于, 调整所述第一链路的 RLC层的发 送窗口中的状态变量, 所述发送窗口中的状态变量包括所述数据中 的下一个待发送数据单元的序列号。
8、根据权利要求 1至 3任一项所述的分流端装置,其特征在于, 所述分流端装置还包括接收单元, 用于接收第一链路失败消息, 其 中, 所述第一链路失败消息包括所述汇聚端装置发送的第一链路失 败消息或者所述第一链路对应的发送装置发送的第一链路失败消 息;
所述分流端装置还包括处理单元, 用于根据所述接收单元接收 到的第一链路失败消息发起第一链路删除过程。
9、根据权利要求 1至 8任一项所述的分流端装置,其特征在于, 所述数据单元为分组数据汇聚 PDCP协议数据单元。
1 0、 一种汇聚端装置, 其特征在于, 包括:
发送单元, 用于向分流端装置发送指示所述汇聚端装置未接收 到的数据单元的状态报告, 以便所述分流端装置根据所述状态报告 指示第一链路停止向所述汇聚端装置传输所述数据单元, 并通过第 二链路将所述数据单元重传至所述汇聚端装置;
其中, 所述状态报告包含所述数据单元的序列号的指示信息, 所述分流端装置通过所述第一链路向所述汇聚端装置发送的数据包 括所述数据单元。
1 1、 根据权利要求 1 0所述的汇聚端装置, 其特征在于, 所述汇 聚端装置还包括确定单元, 用于确定所述数据中的待接收数据单元 的序列号和所述汇聚端装置已接收数据单元的最大序列号; 若所述待接收数据单元的序列号与所述已接收数据单元的最大 序列号之间的间隔满足预设差值条件, 则确定所述待接收数据单元 的序列号对应的数据单元为所述汇聚端装置未接收到的所述数据单 元。
12、 根据权利要求 10所述的汇聚端装置, 其特征在于, 所述汇 聚端装置还包括确定单元, 用于确定所述数据中的待接收数据单元 的序列号未发生更新的时间;
在所述待接收数据单元的序列号未发生更新的时间满足预设时 间阈值时, 确定所述待接收数据单元的序列号对应的数据单元为所 述汇聚端装置未接收到的所述数据单元。
13、 根据权利要求 10至 12任一项所述的汇聚端装置, 其特征 在于, 所述汇聚端装置还包括处理单元, 用于调整所述第一链路的
RLC 层的接收窗口中的状态变量, 所述接收窗口中的状态变量包括 所述数据中的下一个待接收数据单元的序列号和所述数据中的已接 收数据单元的最大序列号。
14、 根据权利要求 13所述的汇聚端装置, 其特征在于, 所述分 流端装置还包括指示单元, 用于指示所述第一链路调整所述第一链 路的 RLC层的发送窗口中的状态变量。
15、 根据权利要求 10至 12任一项所述的汇聚端装置, 其特征 在于, 所述发送单元还用于, 向所述分流端装置发送第一链路失败 消息, 以便所述分流端装置根据所述状态报告和所述第一链路失败 消息发起第一链路删除过程。
16、 根据权利要求 10至 15任一项所述的汇聚端装置, 其特征 在于, 所述数据单元包括 PDCP协议数据单元。
17、 一种基站, 其特征在于, 所述基站包括权利要求 1 至 9 中 任一项所述的分流端装置; 或者所述基站包括权利要求 10至 16 中 任一项所述的汇聚端装置。
18、 一种终端, 其特征在于, 所述终端包括权利要求 1 至 9 中 任一项所述的分流端装置; 或者所述终端包括权利要求 10至 16 中 任一项所述的汇聚端装置。
1 9、 一种数据重传的方法, 其特征在于, 包括:
分流端装置通过第一链路向汇聚端装置发送数据;
所述分流端装置指示所述第一链路停止向所述汇聚端装置传输 所述汇聚端装置未接收到的数据单元,所述数据包括所述数据单元; 所述分流端装置通过第二链路将所述数据单元重传至所述汇聚 端装置。
2 0、 根据权利要求 1 9所述的方法, 其特征在于, 还包括: 确定所述数据中的待确认数据单元的序列号和所述分流端装置 中的待发送数据单元的序列号;
若所述待发送数据单元的序列号与所述待确认数据单元的序列 号之间的间隔满足预设差值条件, 则确定所述待确认数据单元的序 列号对应的数据单元为所述汇聚端装置未接收到的所述数据单元。
2 1、 根据权利要求 1 9所述的方法, 其特征在于, 还包括: 确定所述数据中的待确认数据单元的序列号未发生更新的时 间;
在所述待确认数据单元的序列号未发生更新的时间满足预设时 间阈值时, 确定所述待确认数据单元的序列号对应的数据单元为所 述汇聚端装置未接收到的所述数据单元。
2 2、 根据权利要求 1 9所述的方法, 其特征在于, 还包括: 接收所述汇聚端装置发送的状态报告, 所述状态报告包含所述 汇聚端装置在所述数据中未接收到的数据单元的序列号的指示信 息;
根据所述指示信息确定所述汇聚端装置未接收到的所述数据单 元。
2 3、 根据权利要求 1 9至 2 2任一项所述的方法, 其特征在于, 所述指示所述第一链路停止向所述汇聚端装置传输所述汇聚端装置 未接收到的数据单元包括:
向所述第一链路的 RL C层发送切换链路消息, 所述切换链路消 息包括所述数据单元的全部序列号中的最大序列号的指示信息, 以 便所述 RL C层根据所述最大序列号的指示信息停止传输所述最大序 列号对应的数据单元以及序列号小于所述最大序列号的数据单元。
24、 根据权利要求 1 9至 2 3任一项所述的方法, 其特征在于, 若所述第一链路的 RLC层釆用确认模式,所述方法还包括:
调整所述第一链路的 RLC层的发送窗口中的状态变量, 所述发 送窗口中的状态变量包括所述数据中的下一个待确认数据单元的序 列号和所述数据中的下一个待发送数据单元的序列号;
指示所述第一链路调整所述第一链路的 RLC层的接收窗口中的 状态变量。
25、 根据权利要求 1 9至 2 3任一项所述的方法, 其特征在于, 若所述第一链路的 RLC层釆用非确认模式,所述方法还包括:
调整所述第一链路的 RLC层的发送窗口中的状态变量; 所述发 送窗口中的状态变量包括所述数据中的下一个待发送数据单元的序 列号。
26、 根据权利要求 1 9至 2 1任一项所述的方法, 其特征在于, 所述方法还包括, 接收第一链路失败消息; 根据所述第一链路失败 消息发起第一链路删除过程。
27、 根据权利要求 1 9至 26任一项所述的方法, 其特征在于, 所述数据单元为 PDCP协议数据单元。
28、 一种数据重传的方法, 其特征在于, 包括:
汇聚端装置向分流端装置发送指示所述汇聚端装置未接收到的 数据单元的状态报告, 以便所述分流端装置根据所述状态报告指示 第一链路停止向所述汇聚端装置传输所述数据单元, 并通过第二链 路将所述数据单元重传至所述汇聚端装置;
其中, 所述状态报告包含所述数据单元的序列号的指示信息, 所述分流端装置通过所述第一链路向所述汇聚端装置发送的数据包 括所述数据单元。
29、 根据权利要求 28所述的方法, 其特征在于, 还包括: 确定所述数据中的待接收数据单元的序列号和所述汇聚端装置 已接收数据单元的最大序列号;
若所述待接收数据单元的序列号与所述已接收数据单元的最大 序列号之间的间隔满足预设差值条件, 则确定所述待接收数据单元 的序列号对应的数据单元为所述汇聚端装置未接收到的所述数据单 元。
30、 根据权利要求 28所述的方法, 其特征在于, 还包括: 确定所述数据中的待接收数据单元的序列号未发生更新的时 间;
在所述待接收数据单元的序列号未发生更新的时间满足预设时 间阈值时, 确定所述待接收数据单元的序列号对应的数据单元为所 述汇聚端装置未接收到的所述数据单元。
31、 根据权利要求 28至 30任一项所述的方法, 其特征在于, 还包括:
调整所述第一链路的 RLC层的接收窗口中的状态变量, 所述接 收窗口中的状态变量包括所述数据中的下一个待接收数据单元的序 列号和所述数据中的已接收数据单元的最大序列号。
32、 根据权利要求 31所述的方法, 其特征在于, 还包括: 指示所述第一链路调整所述第一链路的 RLC层的发送窗口中的 状态变量。
3 3、 根据权利要求 28至 30任一项所述的方法, 其特征在于, 还包括:
向所述分流端装置发送第一链路失败消息, 以便所述分流端装 置根据所述状态报告和所述第一链路失败消息发起第一链路删除过 程。
34、 根据权利要求 28至 3 3任一项所述的方法, 其特征在于, 所述数据单元包括 PDCP协议数据单元。
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