WO2015018009A1 - Procédé de retransmission automatique, équipement d'utilisateur et station de base - Google Patents

Procédé de retransmission automatique, équipement d'utilisateur et station de base Download PDF

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Publication number
WO2015018009A1
WO2015018009A1 PCT/CN2013/081006 CN2013081006W WO2015018009A1 WO 2015018009 A1 WO2015018009 A1 WO 2015018009A1 CN 2013081006 W CN2013081006 W CN 2013081006W WO 2015018009 A1 WO2015018009 A1 WO 2015018009A1
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WO
WIPO (PCT)
Prior art keywords
base station
rlc
status report
downlink
pdu
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2013/081006
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English (en)
Chinese (zh)
Inventor
张健
曾清海
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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 Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN201380001951.4A priority Critical patent/CN104641586A/zh
Priority to PCT/CN2013/081006 priority patent/WO2015018009A1/fr
Publication of WO2015018009A1 publication Critical patent/WO2015018009A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1806—Go-back-N protocols

Definitions

  • the present invention relates to the field of communications and, in particular, to methods, user equipment and base stations for automatic retransmission. Background technique
  • 3GPP 3rd generation partnership project
  • LTE-A 3rd generation partnership project
  • CA Carrier Aggregation
  • CoMP Coordinated Multi-Point
  • a UE can establish a wireless connection with a plurality of base stations to communicate with a serving cell provided by a plurality of base stations.
  • a base station responsible for data offloading or aggregation may send a part of downlink data, such as a Radio Link Control (RLC) Protocol Data Unit (PDU), to other base stations.
  • RLC Radio Link Control
  • PDU Protocol Data Unit
  • the base station sends the downlink data to the user equipment (UE) by other base stations.
  • data retransmission is an important mechanism to ensure data reliability.
  • inter-base station CA or CoMP technology there is no corresponding retransmission mechanism to implement automatic data retransmission. Summary of the invention
  • the embodiments of the present invention provide a method, a user equipment, and a base station for automatic retransmission, which can effectively implement automatic retransmission of data in a scenario of cooperation between base stations.
  • a method for automatic retransmission comprising: receiving, by a user equipment, a first partial downlink radio link control RLC protocol data unit PDU from a first base station, and receiving a second partial downlink RLC from a second base station a PDU; the UE generates a first RLC status report and a second RLC status report according to the received status of the first partial downlink RLC PDU and the received status of the second partial downlink RLC PDU, where the first RLC status report is And the second RLC status report includes feedback information of the first partial downlink RLC PDU and the second part And transmitting, by the UE, the first RLC status report to the first base station, and sending the second RLC status report to the second base station, so that the first base station is configured according to the The first RLC status report and the second base station determine whether to perform a retransmission operation according to the second RLC status report.
  • the method further includes: receiving, by the UE, first configuration information from the first base station, where the first configuration information is used to indicate sending to the first base station Decoding a first RLC status report and transmitting the second RLC status report to the second base station.
  • the method further includes: sending, by the UE, first adjustment information to the first base station according to the measurement information, where The first adjustment information is used to indicate that the proportion of the downlink RLC PDU that is sent by the second base station is adjusted, and the measurement information is used to indicate a radio condition of the first base station and a radio condition of the second base station.
  • the method further includes: sending, by the UE, the first part to the first base station Uplinking an RLC PDU and transmitting a second partial uplink RLC PDU to the second base station; the UE receiving a third RLC status report from the first base station, and receiving a fourth RLC status report from the second base station, where The third RLC status report includes feedback information of the first partial uplink RLC PDU, the fourth RLC status report includes feedback information of the second partial uplink RLC PDU, and the UE reports according to the third RLC status And the fourth RLC status report, determining whether to perform a retransmission operation.
  • the method further includes: receiving, by the UE, the first base station from the first base station Two configuration information, where the second configuration information is used to indicate that the UE is from the second base station Receiving the fourth RLC status report.
  • the method further includes: the UE reporting according to the fourth RLC status Determining whether there is a problem in the uplink of the second base station; if the UE determines that there is a problem in the uplink of the second base station, sending, by the UE, second adjustment information to the first base station, or The second base station sends the second adjustment information, where the second adjustment information is used to indicate that there is a problem in the uplink of the second base station.
  • the UE determines, according to the fourth RLC status report, whether there is a problem in the uplink of the second base station, including The UE determines, according to the fourth RLC status report, whether the number of uplink RLC PDUs not received in the second partial uplink RLC PDU is greater than a first threshold, to determine whether an uplink of the second base station exists.
  • the method includes: the UE does not receive the second part of the uplink RLC PDU.
  • the second adjustment information is sent to the first base station.
  • a second aspect provides a method for automatic retransmission, including: a first base station transmitting a first partial downlink radio link control RLC protocol data unit PDU to a user equipment UE; the first base station receiving two from the UE a first RLC status report in the RLC status report, where the second RLC status report in the two RLC status reports is sent by the UE to the second base station, the first RLC status report and the first
  • the second RLC status report includes feedback information of the first part of the downlink RLC PDU and feedback information of the second part of the downlink RLC PDU, where the second part of the downlink RLC PDU is sent by the second base station to the UE And determining, by the first base station, whether to perform a retransmission operation according to the first RLC status report.
  • the method further includes: the first base station sends first configuration information to the UE, and sends third configuration information to the second base station, where the first The configuration information is used to indicate that the first RLC status report is sent to the first base station, and the second RLC status report is sent to the second base station, where the third configuration information is used to indicate that the second base station is configured according to The second RLC status report determines whether a retransmission operation is performed.
  • the first base station sends first configuration information to the UE, and sends a third configuration to the second base station
  • the information includes: sending, by the first base station, the first configuration information to the UE, where the backhaul link between the first base station and the second base station does not meet a transmission requirement, and The second base station sends the third configuration information.
  • the method further includes: the first base station from the UE or the The second base station receives the first adjustment information, where the first adjustment information is used to indicate that the proportion of the downlink RLC PDU that is sent by the second base station is adjusted, and is adjusted by the second base station according to the first adjustment information.
  • the proportion of the downlink RLC PDU to be sent; or the first base station adjusts the proportion of the downlink RLC PDU that is sent by the second base station according to the first RLC status report.
  • the method further includes: The UE receives the first partial uplink RLC PDU; the first base station generates a third RLC status report according to the receiving status of the first partial uplink RLC PDU, where the third RLC status report includes the first partial uplink RLC PDU Feedback information: The first base station sends the third RLC status report to the UE.
  • the method further includes: the first base station receiving, by the second base station, a second partial uplink RLC PDU, where the second part An uplink RLC PDU is received by the second base station from the UE;
  • the first base station generates a third according to the receiving state of the first partial uplink RLC PDU.
  • the RLC status report includes: the first base station generates the third RLC status report according to the receiving status of the first partial uplink RLC PDU and the receiving status of the second partial uplink RLC PDU, where the third RLC status
  • the report includes feedback information of the first partial uplink RLC PDU and feedback information of the second partial uplink RLC PDU.
  • the method further includes: sending, by the first base station, second configuration information to the UE, and Sending fourth configuration information to the second base station, where the second configuration information is used to indicate that the UE receives a fourth RLC status report from the second base station, and the fourth configuration information is used to indicate the second The base station sends a fourth RLC status report to the UE.
  • the third RLC state information includes first indication information, where the first indication information is used to indicate The third RLC status report is generated by the first base station; the fourth RLC status report includes second indication information, where the second indication information is used to indicate that the fourth RLC status report is by the Generated by two base stations.
  • the method further includes: the first base station from the UE or the The second base station receives the second adjustment information, where the second adjustment information is used to indicate an uplink problem of the second base station; and the first base station adjusts to allocate the UE according to the second adjustment information.
  • the strategy of uplink resources is not limited to the first base station from the UE or the The second base station.
  • a third aspect provides a method for automatic retransmission, including: a second base station transmitting a second partial downlink radio link control RLC protocol data unit PDU to a user equipment UE; the second base station receiving from the UE a second RLC status report in the two RLC status reports, where the first RLC status report in the two RLC status reports is sent by the UE to the first base station, the first RLC status report and The second RLC status report includes feedback information of the first partial downlink RLC PDU and feedback information of the second partial downlink RLC PDU; and the second base station determines whether to perform heavy according to the second RLC status report. Pass the operation.
  • the method further includes: the second base station receiving third configuration information from the first base station, where the third configuration information is used to indicate that the second base station is configured according to The second RLC status report determines whether a retransmission operation is performed.
  • the method further includes: determining, by the second base station, the first adjustment information according to the second RLC status report, The first adjustment information is used to indicate that a proportion of downlink RLC PDUs that are sent by the second base station is adjusted; and the second base station sends the first adjustment information to the first base station.
  • the method further includes: The UE receives the second partial uplink RLC PDU; the second base station generates a fourth RLC status report according to the receiving status of the second partial uplink RLC PDU, where the fourth RLC status report includes the second part of the uplink RLC Feedback information of the PDU; the second base station sends the fourth RLC status report to the UE.
  • the method further includes: the second base station receiving fourth configuration information from the first base station, where the fourth configuration information is used And instructing the second base station to send a fourth RLC status report to the UE.
  • the fourth RLC state includes the second indication information, where the second indication information And configured to indicate that the fourth RLC status report is generated by the second base station.
  • the method further includes: detecting, by the second base station, the UE The second adjustment information is determined by the reference signal, or the second base station receives the second adjustment information from the UE, where the second adjustment information is used to indicate an uplink problem of the second base station; The second base station sends the second adjustment information to the first base station.
  • a fourth aspect provides a method for automatic retransmission, including: a first base station transmitting a first partial downlink radio link control RLC protocol data unit PDU to a user equipment UE, and transmitting a second partial downlink RLC to the second base station a PDU, so that the second base station sends the second partial downlink RLC PDU to the UE; the first base station receives an RLC status report, where the RLC status report includes feedback information of the second partial downlink RLC PDU; If the feedback information of the second part of the downlink RLC PDU indicates that the UE does not receive the second group of downlink RLC PDUs in the second part of the downlink RLC PDU, the first base station retransmits to the UE At least one downlink RLC PDU of the second group of downlink RLC PDUs.
  • the first base station retransmits the at least one downlink RLC PDU in the second group of downlink RLC PDUs to the UE, where: Retransmitting the downlink RLC PDU corresponding to the first variable in the second group of downlink RLC PDUs to the UE, if the first variable is not updated after the timer associated with the first variable expires, where the The first variable is the smallest sequence number in the sequence number of the downlink RLC PDU to be acknowledged in the second partial downlink RLC PDU in the transmission window.
  • a variable is the downlink to be confirmed in the second part of the downlink RLC PDU in the transmission window.
  • the smallest sequence number in the sequence number of the RLC PDU, and the second variable is the sequence number of the downlink RLC PDU to be transmitted in the transmission window.
  • a fifth aspect provides a method for automatic retransmission, including: receiving, by a second base station, a second partial downlink RLC PDU from a first base station; and sending, by the second base station, the second partial downlink RLC to a user equipment UE PDU; the second base station receives an RLC status report, where the RLC status report includes feedback information of the second part of the downlink RLC PDU; and the feedback information of the second base station in the second part of the downlink RLC PDU indicates If the UE does not receive the second group of downlink RLC PDUs in the second partial downlink RLC PDU, retransmitting the M downlink RLC PDUs in the second group of downlink RLC PDUs to the UE, where In addition to the two sets of downlink RLC PDUs
  • M is a positive integer and M is smaller than the number of the second group of downlink RLC PDUs.
  • the method further includes: the second base station adjusting the first variable according to the RLC PDU status report, and deleting the second partial downlink RLC PDU from the sending buffer The downlink RLC PDU except the second group of downlink RLC PDUs, where the first variable is the smallest sequence number in the sequence number of the downlink RLC PDU to be acknowledged in the second part of the downlink RLC PDU in the sending window.
  • the sixth aspect provides a user equipment, including: a receiving unit, configured to receive a first partial downlink radio link control RLC protocol data unit PDU from the first base station, and receive a second partial downlink RLC PDU from the second base station; a unit, configured to generate a first RLC status report and a second RLC status report according to the receiving status of the first partial downlink RLC PDU and the receiving status of the second partial downlink RLC PDU, where the first RLC status report and The second RLC status report includes the feedback information of the first part of the downlink RLC PDU and the feedback information of the second part of the downlink RLC PDU, and the sending unit is configured to send the first RLC status to the first base station. Reporting, and sending, to the second base station, the second RLC status report, so that the first base station determines, according to the first RLC status report, the second base station, according to the second RLC status report, whether to perform heavy Pass the operation.
  • the receiving unit is further configured to receive, after the generating unit generates the first RLC status report and the second RLC status report, the first base station a configuration information, the first configuration information is used to indicate that the first RLC status report is sent to the first base station, and the second RLC status report is sent to the second base station.
  • the sending unit is further configured to send first adjustment information to the first base station according to the measurement information, where the first adjustment information is used to indicate that the downlink that is sent by the second base station is adjusted.
  • the RLC PDU ratio, the measurement information is used to indicate a radio condition of the first base station and a radio condition of the second base station.
  • the determining unit is further included;
  • the first base station sends a first partial uplink RLC PDU, and sends a second partial uplink RLC PDU to the second base station;
  • the receiving unit is further configured to receive a third RLC status report from the first base station, and
  • the second base station receives a fourth RLC status report, where the third RLC status report includes feedback information of the first partial uplink RLC PDU, and the fourth RLC status report includes feedback information of the second partial uplink RLC PDU
  • the determining unit is configured to determine whether to perform a retransmission operation according to the third RLC status report and the fourth RLC status report.
  • the receiving unit is further configured to receive second configuration information from the first base station, where the second configuration information is used by And instructing the UE to receive the fourth RLC status report from the second base station.
  • the determining unit is further configured to determine, according to the fourth RLC status report, Determining whether there is a problem in the uplink of the second base station; the sending unit is further configured to: when the determining unit determines that the uplink of the second base station has a problem, send the second to the first base station Adjusting the information, or sending the second adjustment information to the second base station, where the second adjustment information is used to indicate that there is a problem in the uplink of the second base station.
  • the determining unit is specifically configured to determine, according to the fourth RLC status report, that the second part of the uplink RLC PDU is not Whether the number of received uplink RLC PDUs is greater than a first threshold to determine whether there is a problem in the uplink of the second base station;
  • the sending unit is specifically configured to determine, in the determining unit, the second part of the uplink RLC When the number of uplink RLC PDUs not received in the PDU is greater than the first threshold, the second adjustment information is sent to the first base station.
  • a base station including: a sending unit, configured to send a first part downlink downlink link control RLC protocol data unit PDU to a user equipment UE, and a receiving unit, configured to receive two RLC status reports from the UE a first RLC status report, wherein the two The second RLC status report in the RLC status report is sent by the UE to the second base station, where the first RLC status report and the second RLC status report each include feedback information of the first part of the downlink RLC PDU.
  • the second part of the downlink RLC PDU is sent by the second base station to the UE, and the determining unit is configured to determine whether to perform according to the first RLC status report. Retransmission operation.
  • the sending unit is further configured to send first configuration information to the UE, and send third configuration information to the second base station, where the first The configuration information is used to indicate that the first RLC status message is sent to the base station, and the second RLC status message is sent to the second base station, where the third configuration information is used to indicate that the second base station is configured according to the The second RLC status report determines whether a retransmission operation is performed.
  • the sending unit is specifically configured to: the backhaul link between the base station and the second base station does not satisfy the transmission
  • the first configuration information is sent to the UE
  • the third configuration information is sent to the second base station.
  • the first adjusting unit is further included; Receiving, by the UE or the second base station, first adjustment information, where the first adjustment information is used to indicate that a ratio of a downlink RLC PDU that is sent by the second base station is adjusted, and the first adjustment unit is used by Adjusting, according to the first adjustment information, a proportion of a downlink RLC PDU that is sent by the second base station; or, the first adjusting unit, configured to be responsible for adjusting by the second base station according to the first RLC status report The proportion of downlink RLC PDUs sent.
  • the third possible implementation manner where the fourth possible implementation manner further includes: a generating unit, And a generating unit, configured to: generate, by the UE, a first RLC status report according to the receiving status of the first part of the uplink RLC PDU, where the third RLC status report includes The first part of the uplink RLC PDU feedback information; the sending unit is further configured to send the third RLC status report to the UE.
  • the receiving unit is further configured to receive, by the second base station, a second partial uplink RLC PDU, where the second part is The uplink RLC PDU is received by the second base station from the UE; the generating unit is specifically configured to: according to the receiving status of the first partial uplink RLC PDU and the second part of the uplink And generating, by the receiving status of the RLC PDU, the third RLC status report, where the third RLC status report includes feedback information of the first partial uplink RLC PDU and feedback information of the second partial uplink RLC PDU.
  • the sending unit is further configured to send the second configuration information to the UE, and Sending fourth configuration information to the second base station, where the second configuration information is used to indicate that the UE receives a fourth RLC status report from the second base station, and the fourth configuration information is used to indicate the second
  • the base station sends the fourth RLC status report to the UE, where the fourth RLC status report includes feedback information of the second part of the uplink RLC PDU.
  • the second adjustment unit is further included; Receiving, by the UE or the second base station, the second adjustment information, where the second adjustment information is used to indicate that the second base station has an uplink problem; the second adjustment unit is configured to The second adjustment information adjusts a policy for allocating uplink resources to the UE.
  • the eighth aspect provides a base station, including: a sending unit, configured to send a second partial downlink radio link control RLC protocol data unit PDU to the user equipment UE, and a receiving unit, configured to receive two RLC states from the UE a second RLC status report in the report, where the first RLC status report in the two RLC status reports is sent by the UE to the first base station, the first RLC status report and the second
  • the RLC status report includes the feedback information of the first part of the downlink RLC PDU and the feedback information of the second part of the downlink RLC PDU, where the first part of the downlink RLC PDU is sent by the first base station to the UE; Determining whether to perform a retransmission operation according to the second RLC status report.
  • the receiving unit is configured to receive third configuration information from the first base station, where the third configuration information is used to indicate that the second base station is configured according to the The second RLC status report determines whether a retransmission operation is performed.
  • the determining unit is further configured to determine, according to the second RLC status report, the first adjustment information,
  • the first adjustment information is used to indicate that the proportion of the downlink RLC PDUs that are sent by the second base station is adjusted.
  • the sending unit is further configured to send the first adjustment information to the first base station.
  • the generating unit is further configured to: the receiving unit is further configured to receive a second partial uplink RLC PDU from the UE, and the generating unit is configured to use, according to the second a fourth RLC status report is generated, where the fourth RLC status report includes feedback information of the second part of the uplink RLC PDU, and the sending unit is configured to send the Four RLC status reports.
  • the receiving unit is further configured to receive fourth configuration information from the first base station, where the fourth configuration information is used. And instructing the second base station to send a fourth RLC status report to the UE.
  • the determining unit is further configured to determine, according to the sounding reference signal of the UE, a second Adjusting the information, or the receiving unit is further configured to receive the second adjustment information from the UE, where the second adjustment information is used to indicate an uplink problem of the second base station; And sending the second adjustment information to the first base station.
  • a ninth aspect provides a base station, including: a sending unit, configured to send, to a user equipment UE, a first part downlink downlink link control RLC protocol data unit PDU, and send a second part downlink downlink RLC PDU to the second base station, so that The second base station sends the second partial downlink RLC PDU to the UE; the receiving unit is configured to receive an RLC status report, where the RLC status report includes feedback information of the second part of the downlink RLC PDU; And when the feedback information of the second partial downlink RLC PDU indicates that the UE does not receive the second group of downlink RLC PDUs in the second partial downlink RLC PDU, retransmitting the At least one downlink RLC PDU of the second set of downlink RLC PDUs.
  • the sending unit is specifically configured to retransmit the to the UE if the number of the second group of downlink RLC PDUs is greater than a second threshold The second set of downlink RLC PDUs.
  • the sending unit is specifically configured to: when the first variable is not updated after a timer associated with the first variable expires, Passing the downlink RLC PDU corresponding to the first variable in the second group of downlink RLC PDUs, where the first variable is the sequence number of the downlink RLC PDU to be confirmed in the second part of the downlink RLC PDU in the sending window.
  • the sending unit is specifically configured to retransmit to the UE if a difference between the first variable and the second variable is a third threshold Place a downlink RLC PDU corresponding to the first variable in the second group of downlink RLC PDUs, where the first variable is a minimum of a sequence number of the downlink RLC PDU to be acknowledged in the second part of the downlink RLC PDU in the sending window. a sequence number, where the second variable is a sequence number of a downlink RLC PDU to be sent in the sending window.
  • the tenth aspect provides a base station, including: a receiving unit, configured to receive a second partial downlink radio link control RLC protocol data unit PDU from the first base station, and a sending unit, configured to send the second to the user equipment UE a part of the downlink RLC PDU; the receiving unit is further configured to receive an RLC status report, where the RLC status report includes feedback information of the second part of the downlink RLC PDU; the sending unit is further configured to be in the second The feedback information of the part of the downlink RLC PDU indicates that the UE does not receive the second group of downlink RLC PDUs in the second part of the downlink RLC PDU, and retransmits the second group of downlink RLC PDUs to the UE.
  • the M downlink RLC downlink RLC PDUs are retransmitted by the first base station to the UE, where M is a positive integer and M is smaller than the number of the second group of downlink RLC PDUs.
  • the method further includes: the adjusting unit, configured to adjust, according to the RLC PDU status report, the first variable, and delete the second part from the sending buffer a downlink RLC PDU other than the second group of downlink RLC PDUs in the RLC PDU, the first variable being a minimum sequence in a sequence number of the downlink RLC PDU to be acknowledged in the second part of the downlink RLC PDU in the sending window number.
  • the adjusting unit configured to adjust, according to the RLC PDU status report, the first variable, and delete the second part from the sending buffer a downlink RLC PDU other than the second group of downlink RLC PDUs in the RLC PDU, the first variable being a minimum sequence in a sequence number of the downlink RLC PDU to be acknowledged in the second part of the downlink RLC PDU in the sending window number.
  • the first RLC status report and the second RLC status report are respectively generated by the UE, and the first RLC status report is sent to the first base station, and the second RLC status report is sent to the second base station, so that the first base station is configured according to the second base station.
  • the first RLC status report and the second base station can determine whether to perform a retransmission operation according to the second RLC status report, so that automatic retransmission of data in the inter-base station cooperation scenario can be effectively implemented.
  • FIG. 1 is a schematic diagram of a scenario in which an embodiment of the present invention may be applied.
  • 2 is a schematic flow chart of a method for automatic retransmission in accordance with one embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of a method for automatic retransmission according to another embodiment of the present invention.
  • 4 is a schematic flow chart of a method for automatic retransmission according to another embodiment of the present invention.
  • FIG. 5 is a schematic flow chart of a method for automatic retransmission according to an embodiment of the present invention.
  • FIG. 6 is a schematic flowchart of a method for automatic retransmission according to another embodiment of the present invention.
  • 7 is a schematic flow chart of a process of a method for automatic retransmission according to an embodiment of the present invention.
  • Figure 8 is a schematic illustration of a transmission window in accordance with one embodiment of the present invention.
  • FIG. 9 is a schematic flow diagram of a process of a method for automatic retransmission according to another embodiment of the present invention.
  • Figure 10 is a schematic block diagram of a UE in accordance with one embodiment of the present invention.
  • FIG. 11 is a schematic block diagram of a base station in accordance with one embodiment of the present invention.
  • Figure 12 is a schematic block diagram of a base station in accordance with one embodiment of the present invention.
  • FIG. 13 is a schematic block diagram of a base station according to another embodiment of the present invention.
  • FIG. 14 is a schematic block diagram of a base station according to another embodiment of the present invention.
  • Figure 15 is a schematic block diagram of a UE in accordance with one embodiment of the present invention.
  • Figure 16 is a schematic block diagram of a base station in accordance with one embodiment of the present invention.
  • Figure 17 is a schematic block diagram of a base station in accordance with one embodiment of the present invention.
  • FIG. 18 is a schematic block diagram of a base station according to another embodiment of the present invention.
  • FIG. 19 is a schematic block diagram of a base station according to another embodiment of the present invention. detailed description
  • the technical solution of the present invention can be applied to various communication systems, such as: Long Term Evolution (LTE) system, LTE-A system or Universal Mobile Telecommunications System (UMTS), code division multiple access ( Code Division Multiple Access (CDMA) system and Wideband Code Division Multiple Access Wireless (WCDMA).
  • LTE Long Term Evolution
  • LTE-A Universal Mobile Telecommunications System
  • UMTS Universal Mobile Telecommunications System
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access Wireless
  • the UE may also be referred to as a mobile terminal (MT), a mobile user equipment, etc., and may communicate with one or more core networks via a radio access network (eg, Radio Access Network, RAN).
  • a radio access network eg, Radio Access Network, RAN
  • the user device can be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal, for example, a mobile device that can be portable, pocket-sized, handheld, computer-integrated, or in-vehicle.
  • the base station may be an evolved Node B (eNB or e-NodeB) in the LTE system or the LTE-A system, or may be a base station supporting High Speed Packet Access (HSPA) in the UMTS.
  • eNB evolved Node B
  • e-NodeB evolved Node B
  • HSPA High Speed Packet Access
  • FIG. 1 is a schematic diagram of a scenario in which an embodiment of the present invention may be applied.
  • the scenario shown in Figure 1 can be a scenario for an inter-base station CA.
  • Both the base station 110 and the base station 120 may be base stations in the LTE system, or may be base stations in the LTE-A system or base stations supporting HSPA in the UMTS.
  • Base station 110 may have CC1 of frequency fl and base station 120 may have CC2 of frequency f2. There is a common coverage area between CC1 and CC2. UE 130 may be located in a common coverage area of CC1 and CC2. After performing CA on CC1 and CC2, base station 110 and base station 120 can jointly transmit data with UE 130.
  • One of the two base stations can act as a user plane anchor, responsible for data splitting or aggregation, and the other base station acts as a split base station.
  • the scenario of the CoMP between the base stations is similar to the scenario shown in Figure 1, and is not described here.
  • FIG. 2 is a schematic flow chart of a method for automatic retransmission according to an embodiment of the present invention.
  • the method of Figure 2 is performed by a UE, such as may be performed by UE 130 of Figure 1.
  • the UE receives the first part of the downlink radio link control from the first base station (Radio Link
  • RLC Protocol Data Unit
  • the first base station can act as a user plane anchor and is responsible for data offloading or aggregation.
  • the second base station can function as a shunt base station.
  • the second partial downlink RLC PDU may be received by the second base station from the first base station.
  • the first base station can be the base station 110 of Figure 1
  • the second base station can be the base station 120.
  • the first base station may also be the base station 120 of Figure 1
  • the second base station may be the base station 110.
  • base station 110 can transmit a first portion of RLC PDUs to UE 130 and can transmit a second portion of downlink RLC PDUs to base station 120, which can transmit a second portion of downlink RLC PDUs to UEs 130.
  • the UE receives the downlink RLC PDU according to the first part and the second part of the downlink RLC.
  • Receiving status of the PDU generating a first RLC status report and a second RLC status report, where the first The RLC status report and the second RLC status report each include feedback information of the first part of the downlink RLC PDU and feedback information of the second part of the downlink RLC PDU.
  • the UE sends a first RLC status report to the first base station, and sends a second RLC status report to the second base station, so that the first base station determines whether to perform heavy according to the first RLC status report and the second base station according to the second RLC status report. Pass the operation.
  • the RLC status report is mainly used to provide information about the UE's reception status of the downlink RLC PDU.
  • the UE may generate a first RLC status report and a second RLC status report according to the receiving status of the first part of the downlink RLC PDU and the receiving status of the second part of the downlink RLC PDU.
  • Both the first RLC status report and the second RLC status report may include feedback information of the two parts of the downlink RLC PDU.
  • the first RLC status report may include Acknowledge (ACK) / Non Acknowledge (NACK) information of the first partial downlink RLC PDU and ACK/NACK information of the second partial downlink RLC PDU.
  • ACK Acknowledge
  • NACK Non Acknowledge
  • the first base station controls data offloading, and the first part of the downlink RLC PDU and the second part of the downlink RLC PDU are both generated by the first base station, so the first base station can perform the first part of the downlink RLC PDU and the second part of the downlink RLC PDU.
  • Uniform numbering so that the number of the two-part downlink RLC PDU is not repeated. Therefore, the first RLC status report and the second RLC status report may include the numbers of the two-part downlink RLC PDUs and their respective corresponding ACK or NACK information.
  • step 230 if there is no uplink resource in the uplink of the corresponding base station when the UE sends two RLC status reports, the UE may trigger a Buffer Status Report (BSR) and/or a Scheduling Request (Scheduling Request, SR), requesting an uplink resource for sending an RLC status report to the base station.
  • BSR Buffer Status Report
  • SR Scheduling Request
  • the first RLC status report and the second RLC status report are respectively generated by the UE, and the first RLC status report is sent to the first base station, and the second RLC status report is sent to the second base station, so that the first base station is configured according to the second base station.
  • the first RLC status report and the second base station can determine whether to perform a retransmission operation according to the second RLC status report, so that automatic retransmission of data in the inter-base station cooperation scenario can be effectively implemented. Since the UE sends the RLC status report to the two base stations respectively, the RLC status report needs to be forwarded through the inter-base station backhaul link to reach the destination base station, so that the delay of retransmission of the downlink data can be reduced.
  • the backhaul link between base stations usually has a delay, for example, 5 milliseconds to tens of milliseconds, it may cause a large delay in retransmission of downlink data.
  • the UE can send an RLC status report to one of a plurality of base stations of the communication according to the reception status of the downlink data.
  • the base station that receives the RLC status report forwards the RLC status report or notifies the retransmission data to the other base stations through the backhaul link between the base stations (Backhaul).
  • This solution can reduce the air interface overhead while reducing the complexity of the UE.
  • the UE sends the corresponding RLC status report to the first base station and the second base station, respectively, instead of only sending the RLC status report to one of the base stations, so that the base station does not need to forward the RLC status report through the backhaul link or Sending a retransmission indication, because the air interface delay is much smaller than the backhaul link delay, the two base stations can receive the RLC status report in time, and determine whether to trigger the retransmission of the downlink RLC PDU according to the corresponding RLC status report, thereby being able to reduce Retransmission delay of the downlink RLC PDU.
  • the UE may have received some downlink RLC PDUs from other base stations, and the RLC status report already contains The NACK information of these downlink RLC PDUs will result in unnecessary redundant retransmissions.
  • the UE sends a corresponding RLC status report to the first base station and the second base station, respectively, and the air interface delay is much smaller than the backhaul link delay, so both base stations can receive the RLC status 4 report in time, according to
  • the corresponding RLC status report determines whether to trigger retransmission of the downlink RLC PDU, which can significantly reduce redundant retransmission of the downlink RLC PDU.
  • the UE in order to enable the UE to more accurately feed back the status of the RLC PDU received from the two base stations and consider the influence of the backhaul link delay, it is necessary to set a larger weight.
  • the scheduling timer length is such that the UE receives the downlink RLC PDU through a more appropriate waiting time to avoid that some downlink RLC PDUs that are not yet on the way to the UE are falsely reported as NACK feedback.
  • a larger reordering timer can cause congestion in the transmit window and reduce throughput.
  • the UE since the UE sends the corresponding RLC status report to the first base station and the second base station, the UE can configure a normal reordering timer, and does not need to adopt a larger reordering timer to delay the RLC. Since the transmission time of the status report can reduce the congestion phenomenon of the transmission window of the base station and the reception window of the UE, the throughput of the system can be improved.
  • the first RLC status report may include only feedback information of the first partial downlink RLC PDU, and the second RLC status report may include only feedback information of the second partial downlink RLC PDU.
  • the first RLC status report may include feedback information of the first partial downlink RLC PDU and feedback information of the second partial downlink RLC PDU, where the second RLC status report may include only the second part of the downlink RLC. Feedback information of the PDU.
  • first RLC status report and the second RLC status report may be the same or different.
  • first RLC state 4 is different from the second RLC state, for example, the first
  • the RLC status report includes feedback information of the two parts of the downlink RLC PDU
  • the second RLC status report includes the feedback information of the second part of the downlink RLC PDU, which can reduce the air interface overhead of the first RLC status report and the second RLC status report to some extent.
  • the UE when generating the second RLC status report, the UE needs the Media Access Control (MAC) layer to indicate to the RLC layer which downlink RLC PDUs are successfully received from the second base station.
  • the second base station determines on its own which downlink RLC PDUs are not successfully received.
  • MAC Media Access Control
  • the second base station after receiving the second RLC status report, the second base station retransmits the RLC according to how many RLC PDUs are sent to the UE according to the total number of RLC PDUs, and the MAC layer and the RLC layer know which RLC PDUs are not successfully delivered to the UE. PDU. Therefore, the above method increases the complexity of UE and base station processing to some extent.
  • the first RLC status is the same as the second RLC status, for example, the first
  • the RLC status report and the second RLC status report respectively include feedback information of the first part of the downlink RLC PDU and feedback information of the second part of the downlink RLC PDU, and the UE may directly generate the two identical RLCs according to the receiving status of the two parts of the downlink RLC PDU.
  • the status report does not require the MAC layer to indicate, so the processing complexity of the UE can be reduced. However, since the two reports contain the same content, the air interface overhead is increased to some extent compared to the different RLC status reports.
  • the UE may receive first configuration information from the first base station, where the first configuration information is used to indicate that the first RLC status report is sent to the first base station, and the second base station is sent to the second base station. Two RLC status reports.
  • the first base station may configure a mode in which the UE sends an RLC status report.
  • the first base station may be configured by Radio Resource Control (RRC) connection reconfiguration (ConnectionReconfiguration) signaling, RLC control PDU, Media Access Control (MAC) control element (Control Element, CE), etc.
  • RRC Radio Resource Control
  • MAC Media Access Control
  • the RLC Control PDU may refer to a newly defined PDU for configuring the UE.
  • the mode of feeding back the RLC status report may include the first mode and the second mode.
  • the first mode may refer to a mode for respectively transmitting a corresponding RLC status report to the first base station and the second base station, where the second mode may point to one of the base stations transmitting the RLC status.
  • the mode of reporting may be configured by Radio Resource Control (RRC) connection reconfiguration (ConnectionReconfiguration) signaling, RLC control PDU, Media Access
  • the mode in which the UE sends the RLC status report may also be predefined.
  • the UE may send first adjustment information to the first base station according to the measurement information, where the first adjustment information is used to indicate that the proportion of the downlink RLC PDU that is sent by the second base station is adjusted, and the measurement information is used.
  • the wireless condition of the first base station and the wireless condition of the second base station are indicated.
  • the UE may be based on a reference signal received power (RSRP) or a channel quality indicator (CQI) of a cell reference signal (CRS) of the first base station, or based on channel state information reference.
  • RSRP reference signal received power
  • CQI channel quality indicator
  • CRS cell reference signal
  • CSI-RS Channel Status Information Reference Signal
  • the UE may also measure the radio condition of the second base station based on the RSRP or CQI of the CRS of the second base station, or the RSRP or CQI based on the CSI-RS.
  • the UE may notify the first base station of the adjusted offload policy according to the radio condition of the first base station and the radio condition of the second base station. For example, when the wireless condition of the first base station is higher than a preset threshold or the wireless condition of the second base station is lower than a preset threshold, the first adjustment information may indicate that the proportion of the downlink RLC PDU transmitted by the second base station is reduced. When the radio condition of the first base station is lower than a preset threshold or the radio condition of the second base station is higher than a preset threshold, the first adjustment information may indicate that the proportion of the downlink RLC PDU to be transmitted by the second base station is increased.
  • the UE may also notify the first base station of adding or deleting a cell of the second base station according to the radio condition of the first base station and the second base station radio condition, or activate or deactivate the cell of the second base station.
  • the base station responsible for data offloading or aggregation In the uplink transmission between the inter-base station CA or the inter-base station CoMP, for the RLC AM mode, the base station responsible for data offloading or aggregation generates an RLC status report, and then sends an RLC status report to the UE.
  • a base station responsible for data offloading or aggregation is referred to as a control base station.
  • the UE decides whether to perform a retransmission operation according to the received RLC status report.
  • the RLC status report when the RLC status report is generated by the base station responsible for data offloading or aggregation, some uplink RLC PDUs may have been correctly received by other base stations, but since the delay of the backhaul link has not arrived at the control base station, the RLC status report generated by the control base station may include Incorrect NACK information results in redundant retransmission of uplink RLC PDUs, wasting bandwidth, and thereby reducing throughput.
  • the solution of the embodiment of the present invention can significantly reduce redundant retransmission of uplink RLC PDUs.
  • the UE may send the first part of the uplink RLC to the first base station.
  • the PDIL UE may receive from the first base station. And a fourth RLC status report, and receiving, by the second base station, a fourth RLC status report, where the third RLC status report includes feedback information of the first part of the uplink RLC PDU, and the fourth RLC status report includes feedback information of the second part of the uplink RLC PDU.
  • the UE may determine whether to perform a retransmission operation according to the third RLC status report and the fourth RLC status report.
  • the UE may send the first partial uplink RLC PDU to the first base station, and send the second partial uplink RLC PDU to the second base station, and the second base station sends the second uplink to the first base station.
  • the first base station can generate a third RLC status report according to the receiving status of the two parts of the uplink RLC PDU.
  • the third RLC status report may include ACK/NACK information for the first portion of the uplink RLC PDU.
  • the second base station may generate a fourth RLC status report according to the receiving status of the second part of the uplink RLC PDU.
  • the fourth RLC status report may include ACK and/or NACK information of the second partial uplink RLC PDU, or may only include ACK information of the uplink RLC PDU received by the second base station in the second partial uplink RLC PDU.
  • the UE receives the third RLC status report from the first base station and receives the fourth RLC status report from the second base station, and the UE can according to the fourth even if the third RLC status report includes the wrong NACK information.
  • the RLC status report determines whether a retransmission operation needs to be performed, so that redundant retransmission of the uplink RLC PDU can be avoided, thereby improving retransmission efficiency and uplink throughput.
  • the receiving end of the UE does not need to set a large reordering timer length to alleviate the delay of the backhaul link between the base stations.
  • the third RLC state may further include feedback information of the second part of the RLC PDU.
  • the third RLC status report may include not only ACK/NACK information of the first partial uplink RLC PDU, but also ACK/NACK information of the second partial uplink RLC PDU.
  • the UE may determine, according to the third RLC status report and the fourth RLC status report, which are the RLC PDILs that really need to be retransmitted, that is, for the uplink RLC PDU corresponding to the NACK information in the third RLC status report, if in the fourth In the RLC status report, these uplink RLC PDUs correspond to ACK information, then the UE does not need to retransmit these uplink RLC PDIL.
  • the NACK information in the third RLC status report may correspond to the second base station being forwarded to the first base station yet. Reaching the RLC PDU of the first base station, because the second base station has correctly received the RLC PDUs, and the ACK letters of the RLC PDUs are included in the fourth RLC status report. Therefore, the UE can decide to not retransmit these uplink RLC PDUs according to the fourth RLC status report.
  • the fourth RLC status report may further include feedback information of the first part of the uplink RLC PDU. That is, both the third RLC status report and the fourth RLC status report may include feedback information of the two parts of the uplink RLC PDU.
  • the specifics of the feedback in the two RLC status reports can be different.
  • the second base station may not know the receiving status of the first part of the uplink RLC PDU. Therefore, when generating the fourth RLC status report, the second base station may default that the first part of the uplink RLC PDUs correspond to the NACK information.
  • the third RLC status information may include first indication information, where the first indication information is used to indicate that the third RLC status report is generated by the first base station.
  • the fourth RLC status report may include second indication information, where the second indication information is used to indicate that the fourth RLC status report is generated by the second base station.
  • both the first indication information and the second indication information may occupy 1 bit (bit).
  • the first indication information may be set to "0" for indicating that the third RLC status report is generated by the first base station.
  • the second indication information may be set to "1" to indicate that the fourth RLC status report was generated by the second base station.
  • the UE may receive second configuration information from the first base station, where the second configuration information is used to indicate that the UE receives the fourth RLC status report from the second base station.
  • the first base station may configure the UE to receive and process the RLC status report of the second base station by using the RRC connection reconfiguration signaling, the RLC control PDU, the MAC CE, and the like to carry the second configuration information.
  • the UE may determine, according to the fourth RLC status report, whether there is a problem in the uplink of the second base station.
  • the UE may send the second adjustment information to the first base station or the second adjustment information to the second base station, where the second adjustment information is used to indicate the uplink of the second base station. There is a problem with the link.
  • the UE may determine the proportion of the uplink RLC PDU lost in the uplink radio link of the second base station according to the number of RLC PDUs it sends to the second base station and the ACK information in the fourth RLC status report, when the ratio is within a certain period of time. If a certain preset threshold is often exceeded, it is determined that there is a problem with the uplink of the second base station.
  • the first base station or the second base station may adjust a policy for allocating uplink resources to the UE. For example, the first base station may add uplink resources allocated to the UE, and the second base station may To reduce the uplink resources allocated to the UE.
  • the UE may determine, according to the fourth RLC status report, whether the number of uplink RLC PDUs not received in the second partial uplink RLC PDU is greater than a first threshold, to determine an uplink of the second base station. Is there a problem? The UE may send the second adjustment information to the first base station if it is determined that the number of uplink RLC PDUs not received in the second partial uplink RLC PDU is greater than the first threshold.
  • the MAC layer of the UE may indicate which uplink RLC PDUs of the RLC layer are transmitted through the uplink of the second base station, or which uplink RLC PDUs are transmitted through the uplink of the first base station.
  • the UE may determine, according to the fourth RLC status report, that the number of uplink RLC PDUs not received in the second partial uplink RLC PDU is greater than a first threshold. If the number of uplink RLC PDUs that are not received in the second part of the uplink RLC PDU is greater than the first threshold, it may indicate that the uplink status of the second base station is poor, that is, the uplink of the second base station has a problem.
  • the first threshold may be a predetermined threshold representing the number of uplink RLC PDUs lost on the uplink of the second base station. For example, the first threshold can be 8.
  • FIG. 3 is a schematic flowchart of a method for automatic retransmission according to another embodiment of the present invention.
  • the method of Figure 3 is performed by a base station responsible for data offloading or aggregation, such as by base station 110 or base station 120 of Figure 1.
  • the first base station sends the first part of the downlink RLC PDIL to the UE.
  • the first base station receives, from the UE, a first RLC status report in the two RLC status reports, where the second RLC status report in the two RLC status reports is sent by the UE to the second base station, and the first RLC status report is
  • the second RLC status report includes feedback information of the first part of the downlink RLC PDU and feedback information of the second part of the downlink RLC PDU, and the second part of the downlink RLC PDU is sent by the second base station to the UE.
  • the first base station determines, according to the first RLC status report, whether to perform a retransmission operation.
  • the first base station receives the first of the two RLC status reports from the UE.
  • the RLC status report determines whether to perform the retransmission operation according to the first RLC status report, so that automatic data retransmission in the inter-base station cooperation scenario can be effectively implemented.
  • the first RLC status report in the two RLC status reports is received by the first base station from the UE, and the second RLC status report in the two RLC status reports is sent by the UE to the second base station, so that the base stations do not need to pass.
  • the backhaul link forwards the RLC status report or the retransmission indication, thereby reducing the retransmission delay of the downlink RLC PDU.
  • the first base station may send the first configuration information to the UE, and send the third configuration information to the second base station, where the first configuration information is used to send the first RLC status report to the first base station, and And sending, by the second base station, a second RLC status report, where the third configuration information is used to indicate, by the second base station, whether to perform a retransmission operation according to the second RLC status report.
  • the first base station Before starting to transmit data, the first base station may configure a mode in which the UE feeds back the RLC status report, and needs to instruct the second base station to process the second RLC status report of the UE.
  • the first base station may send the first configuration information to the UE and send the first configuration information to the second base station if the backhaul link between the first base station and the second base station does not meet the transmission requirement.
  • Third configuration information may be used to send the first configuration information to the UE and send the first configuration information to the second base station if the backhaul link between the first base station and the second base station does not meet the transmission requirement.
  • the foregoing first mode may be adopted, that is, the UE sends a first RLC status report to the first base station, and sends a second RLC to the second base station.
  • the first base station may notify the UE of the first mode by using the first configuration information, and may indicate to the second base station that the second RLC status report of the UE is processed.
  • the first base station may receive the first adjustment information from the UE or the second base station, where the first adjustment information is used to indicate that the proportion of the downlink RLC PDU that is sent by the second base station is adjusted, and according to the first Adjust the information to adjust the proportion of downlink RLC PDUs that are sent by the second base station.
  • the first base station may adjust the proportion of downlink RLC PDUs sent by the second base station according to the first RLC status report.
  • Both the UE and the second base station may notify the first base station of adjusting the split ratio of the second base station.
  • the UE may determine the first adjustment information according to the measurement information.
  • the second base station may determine the first adjustment information according to the second RLC status report.
  • the first base station may adjust the proportion of the downlink RLC PDUs that are sent by the second base station according to the first adjustment information.
  • the first adjustment information may indicate a decrease in the proportion of downlink RLC PDUs that are transmitted by the second base station, and may also indicate an increase in the proportion of downlink RLC PDUs that are transmitted by the second base station.
  • the first base station may also adjust the proportion of downlink RLC PDUs that are sent by the second base station according to the first RLC status report. For example, if the number of downlink RLC PDUs that are not received by the UE in the second part of the downlink RLC PDU is greater than a preset threshold, the first base station may reduce the proportion of downlink RLC PDUs that are sent by the second base station. If the number of downlink RLC PDUs that are not received by the UE in the first part of the downlink RLC PDU is greater than a preset threshold, the first base station may increase the proportion of downlink RLC PDUs that are sent by the second base station.
  • the first base station may add or delete the second base station according to the first RLC status report.
  • the cell or activates or deactivates the cell of the second base station, and can notify the UE and the second base station of the manner of processing the cell of the second base station.
  • the first base station may receive the second partial uplink RLC PDU from the second base station, where the second partial uplink RLC PDU is received by the second base station from the UE.
  • the first base station may generate a third RLC status report according to the receiving status of the first part of the uplink RLC PDU and the receiving status of the second part of the uplink RLC PDU, where the third RLC status report includes the feedback information of the first part of the uplink RLC PDU and the second part of the uplink Feedback information of the RLC PDU.
  • the first base station may receive the first partial uplink RLC PDU from the UE, and receive the second partial uplink RLC PDU sent by the UE to the second base station from the second base station, so the first base station may according to the first part of the uplink RLC PDU.
  • the receiving state and the receiving state of the second partial uplink RLC PDU generate a third RLC status report.
  • the third RLC status report may include ACK/NACK information of the first part of the uplink RLC PDU and ACK/NACK information of the second part of the uplink RLC PDU. In this way, the UE can determine which are the RLC PDUs that really need to be retransmitted according to the third RLC status report and the fourth RLC status report, so that redundant retransmission can be avoided.
  • the first base station may send the second configuration information to the UE, and send the fourth configuration information to the second base station, where the second configuration information is used to indicate that the UE receives the fourth RLC status from the second base station.
  • the fourth configuration information is used to indicate that the second base station sends a fourth RLC status report to the UE, and the fourth RLC status report includes feedback information of the second part of the uplink RLC PDU.
  • the fourth RLC status report may include ACK/NACK information of the second part of the uplink RLC PDU, or may only include ACK information of the uplink RLC PDU received by the second base station in the second part of the uplink RLC PDU.
  • the third RLC status information may include first indication information, where the first indication information is used to indicate that the third RLC status report is generated by the first base station.
  • the fourth RLC status report may include second indication information, where the second indication information is used to indicate that the fourth RLC status report is generated by the second base station.
  • the first base station may receive second adjustment information from the UE or the second base station, where the second adjustment information is used to indicate that the second base station has an uplink problem.
  • First base station The policy for allocating uplink resources to the UE may be adjusted according to the second adjustment information.
  • the UE may determine the second adjustment information according to the fourth RLC status report, or the second base station may determine the second adjustment information according to the UE's Sounding Reference Signal (SRS).
  • the first base station may reduce the uplink resource of the second base station according to the second adjustment information, or delete or deactivate the cell of the second base station.
  • the first base station may notify the UE and the second base station of the processing manner of the uplink resource or the cell of the second base station.
  • FIG. 4 is a schematic flow chart of a method for automatic retransmission according to another embodiment of the present invention.
  • the method of Figure 4 is performed by a base station, such as by a shunt base station, such as base station 110 or base station 120 shown in FIG.
  • the second base station sends a second part of the downlink RLC PDIL to the UE.
  • the second base station receives, from the UE, a second RLC status report in the two RLC status reports, where the first RLC status report in the two RLC status reports is sent by the UE to the first base station, and the first RLC status report is
  • the second RLC status report includes feedback information of the first part of the downlink RLC PDU and feedback information of the second part of the downlink RLC PDU.
  • the second base station determines, according to the second RLC status report, whether to perform a retransmission operation.
  • the second base station may control retransmission of the second portion of the downlink RLC PDU according to the second RLC status report. For example, if the second base station reports according to the second RLC status, the second part of the downlink RLC is determined.
  • the second base station may retransmit the downlink RLC PDIL that is not received by the UE. If the second base station reports according to the second RLC status, it is determined that the second part of the downlink RLC PDU has been completely received by the UE. Then, the second base station does not need to perform a retransmission operation, and can continue to send a new downlink RLC PDU.
  • the second base station receives the second of the two RLC status reports from the UE.
  • the second base station may receive third configuration information from the first base station, where the third configuration information is used to instruct the second base station to determine whether to perform a retransmission operation according to the second RLC status report.
  • the second base station may determine, according to the second RLC status report, first adjustment information, where the first adjustment information is used to indicate that the proportion of the downlink RLC PDU that is sent by the second base station is adjusted. The second base station may send the first adjustment information to the first base station.
  • the second base station may receive the second partial uplink RLC PDU from the UE.
  • the second base station may generate a fourth RLC status report according to the receiving status of the second part of the uplink RLC PDU, where the fourth RLC status report includes feedback information of the second part of the uplink RLC PDU.
  • the second base station sends a fourth RLC status report to the UE.
  • the second base station may receive fourth configuration information from the first base station, where the fourth configuration information is used to instruct the second base station to send a fourth RLC status report to the UE.
  • the fourth RLC state report includes second indication information, where the second indication information is used to indicate that the fourth RLC status report is generated by the second base station.
  • the second base station may determine the second adjustment information according to the sounding reference signal of the UE, or the second base station may receive the second adjustment information from the UE, where the second adjustment information is used to indicate the second base station. There is a problem with the uplink. Then can be adjusted according to the second adjustment information
  • the first base station receives an RLC status report, where the RLC status report includes feedback information of the second part of the downlink RLC PDU.
  • the method for the UE to feed back the RLC status report may adopt the method of the foregoing embodiment of FIG. 2, or may adopt a method of the prior art.
  • the UE may send a first RLC status report to the first base station, and send a second RLC status report to the second base station, and then the RLC received by the first base station in step 520.
  • the status report is the first RLC status report.
  • the UE may only send the RLC status report to the first base station, or To send the RLC status report to the second base station, the RLC status report in step 520 may be received by the first base station directly from the UE, or may be received from the second base station.
  • the first base station retransmits the second group of downlink RLC PDUs to the UE. At least one downstream RLC PDU.
  • the first base station when the feedback information of the downlink RLC PDU in the second part indicates that the UE does not receive the second group of downlink RLC PDUs in the second part of the downlink RLC PDU, the first base station retransmits the second group to the UE.
  • At least one downlink RLC PDU in the downlink RLC PDU can improve the flexibility of the retransmission control and can improve the retransmission efficiency if the radio condition of the second base station is not good.
  • the first base station may retransmit the second group of downlink RLC PDIL to the UE if the number of the second group of downlink RLC PDUs is greater than the second threshold.
  • the number of RLC PDUs is greater than the second threshold, which may indicate that the downlink of the second base station is not good.
  • the first base station may retransmit the second group of downlink RLC PDUs for the second base station, thereby improving retransmission efficiency and ensuring normal operation.
  • the second threshold may be a predetermined threshold indicating the number of downlink RLC PDUs that the UE did not successfully receive.
  • the first variable may be the transmission variable low-end transmission variable (Acknowledged), VT(A), and the low-end variable VT(A) of the transmission window may be the downlink RLC to be confirmed in the second part of the downlink RLC PDU in the transmission window.
  • the smallest serial number in the serial number of the PDU Serial Numbers, SN), that is, the sequence number of the first downlink RLC PDU to be confirmed in the second part of the downlink RLC PDU in the transmission window.
  • the first base station may retransmit the downlink RLC PDU corresponding to the first variable to the second base station, that is, the foregoing Downstream RLC PDIL indicated by the minimum sequence number
  • the duration of the above timer may be preset. In this way, the retransmission efficiency can be improved, thereby ensuring normal data transmission.
  • the first base station may retransmit the first variable in the second group of downlink RLC PDUs to the UE if the difference between the first variable and the second variable is the third threshold.
  • the downlink RLC PDU where the first variable is the smallest sequence number in the sequence number of the downlink RLC PDU to be acknowledged in the second part of the downlink RLC PDU in the transmission window, and the second variable is the sequence of the downlink RLC PDU to be transmitted in the transmission window. number.
  • the first variable may be the low-end variable VT(A) of the transmission window, which is the smallest sequence number in the sequence number of the downlink RLC PDU to be acknowledged in the second part of the downlink RLC PDU in the transmission window, that is, the second part of the downlink RLC PDU.
  • the second variable may be the sequence number VT(S) of the first downstream RLC PDU waiting to be sent in the transmit window. Since the maximum value of the transmission window is determined, when the difference between the first variable and the second variable is the maximum value of the transmission window, the transmitting end cannot continue to send a new RLC PDU, causing the transmission window to be blocked, affecting the throughput.
  • a third threshold is set to avoid this. If the difference between the first variable and the second variable reaches a preset third threshold, indicating that the downlink radio link status of the second base station may be bad, the first base station may retransmit the downlink corresponding to the first variable for the second base station. RLC PDU.
  • the third threshold may be preset, for example, may be set to 10.
  • the first base station may send the first retransmission information to the second base station, where the first retransmission information is used to indicate that the second base station does not retransmit at least one of the second group of downlink RLC PDUs.
  • the first base station retransmits at least one downlink of the second part of the downlink RLC PDU for the second base station
  • the RLC PDU the first base station can notify the second base station that the downlink RLC PDUs that need to be retransmitted by the first base station are not required to be retransmitted to avoid redundant retransmission.
  • the first base station may receive second retransmission information from the second base station, where the second retransmission information is used to indicate that the first base station retransmits at least one of the second group of downlink RLC PDUs.
  • the first base station of the RLC PDIL may retransmit the second group of downlinks to the UE according to the second retransmission information.
  • the second base station may request the first base station to retransmit at least one downlink RLC PDU in the second group of downlink RLC PDUs according to its own radio condition or downlink state.
  • the second retransmission information may include a sequence number of at least one downlink RLC PDU that needs to be assisted for retransmission.
  • FIG. 6 is a schematic flowchart of a method for automatic retransmission according to another embodiment of the present invention.
  • the method of Figure 6 is performed by a shunt base station, such as base station 110 or base station 120 shown in FIG.
  • the second base station receives a second partial downlink RLC PDU from the first base station.
  • the second base station sends a second partial downlink RLC PDU to the UE.
  • the second base station receives an RLC status report, where the RLC status report includes feedback information of the second part of the downlink RLC PDU.
  • the method for the UE to feed back the RLC status report may adopt the method of the foregoing embodiment of Fig. 2, or may adopt the method of the prior art.
  • the UE may send a first RLC status report to the first base station and a second RLC status report to the second base station, and then the RLC status received by the second base station in step 630.
  • the report is the second RLC status report described above.
  • the UE may send the RLC status report only to the first base station, or may only send the RLC status report to the second base station.
  • the RLC status report in step 630 may be that the second base station directly receives from the UE. It can also be received from the first base station.
  • the RLC status report may include feedback information of the second part of the downlink RLC PDU, for example, may include ACK/NACK information of the second part of the downlink RLC PDU, and may also include the downlink RLC PDU received by the UE in the second part of the downlink RLC PDU. ACK information.
  • the RLC status report may further include feedback information of the first part of the downlink RLC PDU, for example, ACK/NACK information of the first part of the downlink RLC PDU.
  • the second base station retransmits the second group of downlink RLC PDUs to the UE, where the feedback information of the second part of the downlink RLC PDU indicates that the UE does not receive the second group of downlink RLC PDUs in the second part of the downlink RLC PDU.
  • M downlink RLC PDUs, the remaining downlink RLC PDUs except the M downlink RLC PDUs in the second group of downlink RLC PDUs are retransmitted by the first base station to the UE, M is a positive integer and M is smaller than the number of the second group of downlink RLC PDUs .
  • the second base station may retransmit the M downlink RLC PDUs to the UE, and the remaining downlink RLC PDUs other than the M downlink RLC PDUs in the second group of downlink RLC PDUs It can be retransmitted by the first base station to the UE.
  • the feedback information of the downlink RLC PDU in the second part of the second base station indicates that the UE does not receive the second group of downlink RLC PDUs in the second part of the downlink RLC PDU. And retransmitting, to the UE, the M downlink RLC PDUs in the second group of the downlink RLC PDUs, and the remaining downlink RLC PDUs in the second group of downlink RLC PDUs except the M downlink RLC PDUs are retransmitted by the first base station to the UE,
  • the flexibility of the retransmission control can be improved, and the retransmission efficiency can be improved in the case where the radio conditions of the second base station are not good.
  • the second base station may receive the first retransmission information from the first base station, where the first retransmission information is used to indicate that the second base station does not retransmit the second group of downlink RLC data. Retransmitting the information, and retransmitting the M downlink RLC PDUs in the second group of downlink RLC PDUs to the UE.
  • the first base station may retransmit the remaining downlink RLC PDUs except the M downlink RLC PDUs according to the radio condition or the downlink state of the second base station, and notify the second base station not to retransmit the downlink RLC PDUs.
  • the second base station may further send second retransmission information to the first base station, where the second retransmission information is used to indicate that the first base station retransmits the downlink of the second group of downlink RLC PDUs.
  • the second base station may request the first base station to retransmit a part of the downlink RLC PDU according to its own radio condition or downlink state.
  • the second retransmission information may carry the sequence numbers of the remaining downlink RLC PDUs other than the M downlink RLC PDUs.
  • the second base station may adjust the first variable according to the RLC PDU status report, and delete the downlink RLC of the second partial downlink RLC PDU except the second group of downlink RLC PDUs from the sending buffer.
  • the first variable is the smallest sequence number in the sequence number of the downlink RLC PDU to be acknowledged in the second part of the downlink RLC PDU in the transmission window.
  • the second base station can maintain the transmit window and the transmit buffer.
  • the first variable may be a low-end variable VT(A) of the transmission window, which is the smallest sequence number in the sequence number of the downlink RLC PDU to be confirmed in the second part of the downlink RLC PDU.
  • the second base station can adjust the transmit window low-end variable VT(A) according to the ACK/NACK information in the RLC status report.
  • the second base station may also delete the downlink RLC PDU that the UE has received in the second part of the downlink RLC PDU from the transmission buffer.
  • the first base station may simultaneously send the downlink data packet convergence protocol (PDCP) service data unit corresponding to the second partial downlink RLC PDU to the second base station.
  • PDCP downlink data packet convergence protocol
  • Service Data Unit The remaining time.
  • the second base station can determine the latest time to delete the second portion of the downlink RLC PDU from the transmit buffer.
  • the first base station may send, to the second base station, the remaining time of the drop timer corresponding to the PDCP SDU of the first base station in the downlink PDCP SDU corresponding to the second partial downlink RLC PDU, and the second base station may determine according to the remaining time. Scheduling delay.
  • the first base station may send, to the second base station, the remaining time of the drop timer corresponding to the downlink PDCP SDU corresponding to the second partial downlink RLC PDU, so that the second base station may separately determine to delete each downlink RLC PDU from the sending buffer. time.
  • the second base station may also maintain the transmission window and maintain only the transmission buffer. In this case, the second base station may not control the retransmission of the downlink RLC PDU, but only transmits the downlink RLC PDU received from the first base station to the UE. After transmitting the RLC PDU to the UE, the second base station may delete the downlink RLC PDIL that has been forwarded to the UE from the sending buffer. If there is a downlink RLC PDU that needs to be retransmitted, and the first base station determines to retransmit the second base station.
  • the first base station may send the downlink RLC PDUs that need to be retransmitted by the second base station to the second base station, and the second base station sends the downlink RLC PDUs to the UE.
  • Figure 7 is a schematic flow diagram of a process for a method of automatic requesting, in accordance with one embodiment of the present invention.
  • the first base station sends first configuration information to the UE, where the first configuration information is used to indicate sending the first RLC status report to the first base station, and sending the second to the second base station.
  • the first base station sends third configuration information to the second base station, where the third configuration information is used to indicate that the second base station receives and processes the second RLC status report sent by the UE.
  • the first base station may configure the UE to feed back the mode of the RLC status report and notify the second base station of the mode.
  • the first base station sends a first partial downlink RLC PDU to the UE. 704.
  • the first base station sends a second partial downlink RLC PDU to the second base station.
  • the second base station sends a second partial downlink RLC PDU to the UE.
  • the UE generates a first RLC status report and a second RLC status report according to the receiving status of the first part of the downlink RLC PDU and the receiving status of the second part of the downlink RLC PDU.
  • the first RLC status report may include feedback information of the first partial downlink RLC PDU and feedback information of the second partial downlink RLC PDU
  • the second RLC status report may include feedback information of the first partial downlink RLC PDU and the second part of the downlink information Feedback information of the RLC PDU.
  • the first RLC status report may include feedback information of the first partial downlink RLC PDU and feedback information of the second partial downlink RLC PDU
  • the second RLC status report may include only feedback information of the second partial downlink RLC PDU
  • the UE sends a first RLC status report to the first base station.
  • the UE sends a second RLC status report to the second base station.
  • the first base station determines, according to the first RLC status report, that the UE does not receive the first group of downlink RLC PDUs in the first part of the downlink RLC PDUs and the second group of downlink RLC PDUs in the second part of the downlink RLC PDUs.
  • the first base station retransmits the first group of downlink RLC PDUs to the UE.
  • the first base station retransmits, to the UE, the remaining downlink RLC PDUs except the M downlink RLC PDUs in the second group of downlink RLC PDUs, where M is a positive integer, and M is smaller than the number of the second group of downlink RLC PDUs.
  • the first base station may retransmit the downlink RLC PDU corresponding to the first variable in the second group of downlink RLC PDUs, where the first variable is not updated, after the timer associated with the first variable expires.
  • the first base station may retransmit the downlink RLC PDU corresponding to the first variable in the second group of downlink RLC PDUs to the UE, where the difference between the first variable and the second variable is the third threshold, where A variable is the smallest sequence number in the sequence number of the downlink RLC PDU to be acknowledged in the second part of the downlink RLC PDU in the transmission window, and the second variable is the sequence number of the downlink RLC PDU to be transmitted in the transmission window.
  • the first base station sends the first retransmission information to the second base station, where the first retransmission information indicates the second RLC PDU.
  • the second base station retransmits the M downlink RLC PDUs in the second group of downlink RLC PDUs to the UE according to the first retransmission information.
  • step 701 and step 702 may be performed in parallel, or step 702 may be performed first, and then step 701 is performed.
  • step 707 and step 708 may be performed in parallel, or step 708 may be performed first, and then step 707 is performed.
  • the first RLC status report and the second RLC status report are respectively generated by the UE, and the first RLC status report is sent to the first base station, and the second RLC status report is sent to the second base station, so that the first base station is configured according to the second base station.
  • the first RLC status report and the second base station can determine whether to perform a retransmission operation according to the second RLC status report, so that automatic retransmission of data in the inter-base station cooperation scenario can be effectively implemented.
  • the first RLC status report and the second RLC status report are generated by the UE, and the first RLC status report is sent to the first base station, and the second RLC status report is sent to the second base station, so that the base stations do not need to pass.
  • the backhaul link forwards the RLC status report or the retransmission indication, thereby reducing the retransmission delay of the downlink RLC PDU.
  • Figure 8 is a schematic illustration of a transmission window in accordance with one embodiment of the present invention.
  • the first base station can maintain a total transmission window
  • the second base station can maintain a transmission window related to the downlink RLC PDU that it is responsible for transmitting.
  • the first base station has sent the downlink RLC PDU with the SN being 1 ⁇ 5, wherein the first base station sends the downlink RLC PDU with the SN of 1 to the UE, and sends the downlink RLC PDU with the SN of 2 ⁇ 5 to the second base station. .
  • the second base station After receiving the downlink RLC PDU with the SN of 2 ⁇ 5 sent by the first base station, the second base station sends a downlink RLC PDU with the SN of 2 ⁇ 4 to the UE.
  • the low-end variable of the transmission window of the first base station is VT1(A), and VT1(A) is the smallest SN of the SNs of the downlink RLC PDU to be acknowledged.
  • the state variable of the first base station is VT1(S), and VT1(S) is the SN of the next downlink RLC PDU to be transmitted.
  • the low-end variable of the transmission window of the second base station is VT2(A), and VT1(A) is the smallest SN of the SNs of the downlink RLC PDU to be acknowledged in the downlink RLC PDU that is responsible for the second base station. It is also assumed that the state variable of the second base station is VT2(S), and VT2(S) is the SN of the next downlink RLC PDU to be transmitted in the downlink RLC PDU transmitted by the second base station.
  • VT1(A) 1 for the first base station.
  • VT1(S) 6.
  • FIG. 9 is a schematic flow diagram of a process of a method for automatic retransmission according to another embodiment of the present invention.
  • the first base station sends second configuration information to the UE, where the second configuration information is used to instruct the UE to receive and process the fourth RLC status report sent by the second base station.
  • the first base station may configure the first base station and the second base station to provide feedback to the UE.
  • the UE sends a first part of the uplink RLC PDU to the first base station.
  • the UE sends a second partial uplink RLC PDU to the second base station.
  • the second base station sends a second partial uplink RLC PDU to the first base station.
  • the second base station can maintain the receiving window according to the prior art. After the RLC AM entity receiving end reordering timer expires, the second base station sends the received uplink RLC PDU to the first base station.
  • the first base station generates a third RLC status report according to the receiving status of the first part of the uplink RLC PDU and the receiving status of the second part of the uplink RLC PDU.
  • the third RLC status report may include feedback information of the first partial uplink RLC PDU and feedback information of the second partial uplink RLC PDU.
  • the third RLC status report may include the first part The feedback information of the uplink RLC PDU is divided.
  • the first base station sends a third RLC status report to the UE.
  • the second base station generates a fourth RLC status report according to the receiving status of the second part of the uplink RLC PDU.
  • the fourth RLC status report may include feedback information of the second part of the uplink RLC PDU.
  • the second base station sends a second RLC status report to the UE.
  • the UE determines, according to the second RLC status report, that the number of uplink RLC PDUs that are not received by the UE in the second part of the uplink RLC PDU is greater than a first threshold, determining that there is a problem in the uplink of the second base station.
  • the UE sends second adjustment information to the first base station, where the second adjustment information is used to indicate that there is a problem in the uplink of the second base station.
  • the first base station adjusts, according to the second adjustment information, a policy for allocating uplink resources to the UE.
  • the UE may also send the second adjustment information to the second base station without transmitting the second adjustment information to the first base station. That is, after step 910, steps 913 through 915 may be performed without performing steps 911 and 912.
  • the UE sends second adjustment information to the second base station, where the second adjustment information is used to indicate that there is a problem in the uplink of the second base station.
  • the second base station sends second adjustment information to the first base station.
  • the first base station adjusts, according to the second adjustment information, a policy for allocating uplink resources to the UE.
  • a policy for allocating uplink resources to the UE.
  • FIG. 9 the procedure for the UE to retransmit the uplink RLC PDU to the first base station and the second base station is not shown. The process may refer to the prior art, and details are not described herein again.
  • step 901 and step 902 may be performed in parallel, or step 902 may be performed first, and then step 901 is performed.
  • steps 906 and 907 may be performed in parallel with steps 908 and 909, or steps 908 and 909 may be performed first, and then steps 906 and 907 may be performed.
  • the UE receives the third RLC status report from the first base station, and receives the fourth RLC status report from the second base station, and the UE can be based on the fourth RLC status even if the third RLC status report includes the fake NACK information.
  • the report determines whether a retransmission operation needs to be performed, so that redundant retransmission of the uplink RLC PDU can be avoided, thereby improving retransmission efficiency and uplink throughput.
  • FIG. 10 is a schematic block diagram of a UE in accordance with one embodiment of the present invention.
  • UE 1000 includes a receipt Element 1010, generating unit 1020 and transmitting unit 1030.
  • the receiving unit 1010 receives the first partial downlink RLC PDU from the first base station and the second partial downlink RLC PDU from the second base station.
  • the generating unit 1020 generates a first RLC status report and a second RLC status report according to the receiving status of the first partial downlink RLC PDU and the receiving status of the second partial downlink RLC PDU, where the first RLC status report and the second RLC status report are both included
  • the sending unit 1030 sends a first RLC status report to the first base station, and sends a second RLC status report to the second base station, so that the first base station determines whether to perform heavy according to the first RLC status report and the second base station according to the second RLC status report. Pass the operation.
  • the first RLC status report and the second RLC status report are respectively generated by the UE, and the first RLC status report is sent to the first base station, and the second RLC status report is sent to the second base station, so that the first base station is configured according to the second base station.
  • the first RLC status report and the second base station can determine whether to perform a retransmission operation according to the second RLC status report, so that automatic retransmission of data in the inter-base station cooperation scenario can be effectively implemented.
  • the first RLC status report and the second RLC status report are generated by the UE, and the first RLC status report is sent to the first base station, and the second RLC status report is sent to the second base station, so that There is no need to forward the RLC status report or retransmission indication over the backhaul link, thereby reducing the retransmission delay of the downlink RLC PDU.
  • the receiving unit 1010 may further receive first configuration information, where the first configuration information is used to send the first RLC status report to the first base station and the second base station to the second base station. RLC status report.
  • the sending unit 1030 may further send first adjustment information to the first base station according to the measurement information, where the first adjustment information is used to indicate that the proportion of the downlink RLC PDU that is sent by the second base station is adjusted, and the measurement is performed.
  • the information is used to indicate the wireless condition of the first base station and the wireless condition of the second base station.
  • the UE 1000 may further include a determining unit 1040.
  • the sending unit 1030 may further send the first partial uplink RLC PDU to the first base station, and send the second partial uplink RLC to the second base station.
  • the PDIL receiving unit 1010 may also receive the third RLC status report from the first base station, and may obtain the third RLC status report from the second base station. Receiving a fourth RLC status report, where the third RLC status report includes feedback information of the first part of the uplink RLC PDU, and the fourth RLC status report includes feedback information of the second part of the uplink RLC PDU.
  • the determining unit 1040 can be based on the third The RLC status report and the fourth RLC status report determine whether to perform a retransmission operation.
  • the third RLC state may further include feedback information of the second part of the RLC PDU.
  • the receiving unit 1010 may further receive second configuration information from the first base station, where the second configuration information is used to indicate that the UE receives the fourth RLC status report from the second base station.
  • the third RLC status information may include first indication information, where the first indication information is used to indicate that the third RLC status report is generated by the first base station.
  • the fourth RLC status report may include second indication information, where the second indication information is used to indicate that the fourth RLC status report is generated by the second base station.
  • the determining unit 1040 may further determine, according to the fourth RLC status report, whether there is a problem in the uplink of the second base station.
  • the sending unit 1030 may further send the second adjustment information to the first base station or the second adjustment information to the second base station, where the determining unit 1040 determines that there is a problem of the uplink of the second base station, where the second adjustment information is used. There is a problem indicating that the uplink of the second base station.
  • the base station 1100 is the first base station described above.
  • the base station 1100 includes a transmitting unit 1110, a receiving unit 1120, and a determining unit 1130.
  • the transmitting unit 1110 transmits the first partial downlink RLC PDU to the UE.
  • the receiving unit 1120 receives the first RLC status report in the two RLC status reports from the UE, where the second RLC status report in the two RLC status reports is sent by the UE to the second base station, the first RLC status report and the second
  • the RLC status report includes feedback information of the first part of the downlink RLC PDU and feedback information of the second part of the downlink RLC PDU, and the second part of the downlink RLC PDU is sent by the second base station to the UE.
  • the determining unit 1130 determines whether to perform a retransmission operation according to the first RLC status report.
  • the first base station receives the first of the two RLC status reports from the UE.
  • the sending unit 1110 may further send the first configuration information to the UE, and send the third configuration information to the second base station, where the first configuration information is used to indicate that the first RLC status report is sent to the base station, and And sending, by the second base station, a second RLC status report, where the third configuration information is used to indicate, by the second base station, whether to perform a retransmission operation according to the second RLC status report.
  • the sending unit 1110 may send the first configuration information to the UE, and send the first configuration information to the second base station, if the backhaul link between the base station 1100 and the second base station does not meet the transmission requirement.
  • the base station 1100 may further include a first adjusting unit 1140.
  • the receiving unit 1120 may receive first adjustment information from the UE or the second base station, where the first adjustment information is used to indicate that the proportion of the downlink RLC PDUs that are sent by the second base station is adjusted.
  • the first adjusting unit 1140 may adjust a downlink RLC PDU ratio that is sent by the second base station according to the first adjustment information.
  • the first adjusting unit 1140 may adjust the proportion of the downlink RLC PDUs that are sent by the second base station according to the first RLC status report.
  • the base station 1100 may further include a generating unit 1150.
  • the receiving unit 1120 may further receive a second partial uplink RLC PDU from the second base station, where the second partial uplink RLC PDU is received by the second base station from the UE.
  • the generating unit 1150 may generate a third RLC status report according to the receiving status of the first partial uplink RLC PDU and the receiving status of the second partial uplink RLC PDU, where the third RLC status report may include feedback information of the first partial uplink RLC PDU and the second part Feedback information of the uplink RLC PDU.
  • the sending unit 1110 may further send the second configuration information to the UE, and send the fourth configuration information to the second base station, where the second configuration information is used to indicate that the UE is from the second base.
  • the station receives the fourth RLC status report, where the fourth configuration information is used to indicate that the second base station sends a fourth RLC status report to the UE, and the fourth RLC status report includes feedback information of the second part of the uplink RLC PDU.
  • the base station 1100 may further include a second adjusting unit 1160.
  • the receiving unit 1120 may further receive second adjustment information from the UE or the second base station, where the second adjustment information is used to indicate that the second base station has an uplink problem.
  • the second adjusting unit 1160 may adjust a policy for allocating uplink resources to the UE according to the second adjustment information.
  • FIG. 12 is a schematic block diagram of a base station in accordance with one embodiment of the present invention.
  • Base station 1200 is the second base station described above.
  • the base station 1200 includes a transmitting unit 1210, a receiving unit 1220, and a determining unit 1230.
  • the second base station receives the second RLC status report in the two RLC status reports from the UE, and determines whether to perform the retransmission operation according to the second RLC status report, so that data in the inter-base station cooperation scenario can be implemented. Automatic retransmission.
  • the second RLC status report in the two RLC status reports is received by the second base station, and the first RLC status report in the two RLC status reports is sent by the UE to the first base station.
  • the RLC status report or the retransmission indication is not required to be forwarded between the base stations through the backhaul link, so that the retransmission delay of the downlink RLC PDU can be reduced.
  • the receiving unit 1220 may receive third configuration information from the first base station, where the third configuration information is used to instruct the second base station to determine whether to perform a retransmission operation according to the second RLC status report.
  • the determining unit 1230 may further determine, according to the second RLC status report, the first adjustment information, where the first adjustment information is used to indicate that the proportion of the downlink RLC PDU that is sent by the second base station is adjusted.
  • the sending unit 1210 may further send the first adjustment information to the first base station.
  • the base station 1200 may further include a generating unit 1240.
  • the receiving unit 1220 can also receive the second partial uplink RLC PDU from the UE.
  • the generating unit 1240 may generate a fourth RLC status report according to the receiving status of the second part of the uplink RLC PDU, where the fourth RLC status report includes feedback information of the second part of the uplink RLC PDU.
  • the sending unit 1210 may send a fourth RLC status report to the UE.
  • the receiving unit 1220 may further receive fourth configuration information from the first base station, where the fourth configuration information is used to instruct the second base station to send a fourth RLC status report to the UE.
  • the determining unit 1230 may further determine the second adjustment information according to the sounding reference signal of the UE, or the receiving unit 1220 may further receive the second adjustment information from the UE, where the second adjustment information is used to indicate the first There is a problem with the uplink of the two base stations.
  • the sending unit 1210 may also send second adjustment information to the first base station.
  • FIG. 13 is a schematic block diagram of a base station according to another embodiment of the present invention.
  • the base station 1300 is the first base station described above.
  • the base station 1300 includes a transmitting unit 1310 and a receiving unit 1320.
  • the sending unit 1310 sends the first partial downlink RLC PDU to the UE, and sends the second partial downlink RLC PDU to the second base station, so that the second base station sends the second partial downlink RLC PDU to the UE.
  • the receiving unit 1320 can receive an RLC status report, where the RLC status report includes feedback information of the second part of the downlink RLC PDU.
  • the sending unit 1310 further retransmits at least one of the second group of downlink RLC PDUs to the UE, if the feedback information of the second part of the downlink RLC PDU indicates that the UE does not receive the second group of downlink RLC PDUs in the second part of the downlink RLC PDU.
  • a downstream RLC PDU is retransmits at least one of the second group of downlink RLC PDUs to the UE, if the feedback information of the second part of the downlink RLC PDU indicates that the UE does not receive the second group of downlink RLC PDUs in the second part
  • the first base station when the feedback information of the downlink RLC PDU in the second part indicates that the UE does not receive the second group of downlink RLC PDUs in the second part of the downlink RLC PDU, the first base station retransmits the second group to the UE.
  • At least one downlink RLC PDU in the downlink RLC PDU can improve the flexibility of the retransmission control and can improve the retransmission efficiency if the radio condition of the second base station is not good.
  • the sending unit 1310 may retransmit the second group of downlink RLC PDILs to the UE if the number of the second group of downlink RLC PDUs is greater than the second threshold.
  • the sending unit 1310 may retransmit the second group of downlink RLC PDUs to the UE if the first variable has not been updated after the timer associated with the first variable expires.
  • the sending unit 1310 may retransmit the first variable in the second group of downlink RLC PDUs to the UE if the difference between the first variable and the second variable is the third threshold.
  • the downlink RLC PDU where the first variable is the smallest sequence number in the sequence number of the downlink RLC PDU to be acknowledged in the second part of the downlink RLC PDU in the transmission window, and the second variable is the sequence of the downlink RLC PDU to be transmitted in the transmission window. number.
  • the sending unit 1310 may further send the first retransmission information to the second base station, where the first retransmission information is used to indicate that the second base station does not retransmit at least one of the second group of downlink RLC PDUs.
  • Downstream RLC PDIL Downstream RLC PDIL
  • the receiving unit 1320 may further receive second retransmission information from the second base station, where the second retransmission information is used to indicate that the first base station retransmits at least one of the second group of downlink RLC PDUs. Downstream RLC PDU.
  • the sending unit 1310 may retransmit the at least one downlink RLC PDU of the second group of downlink RLC PDUs to the UE according to the second retransmission information.
  • the receiving unit 1410 receives the second partial downlink RLC PDU from the first base station.
  • the sending unit 1420 sends a second partial downlink RLC PDU to the UE.
  • the receiving unit 1410 also receives an RLC status report, where the RLC status report includes feedback information of the second part of the downlink RLC PDU.
  • the sending unit 1420 further retransmits the M in the second group of downlink RLC PDUs to the UE if the feedback information of the second part of the downlink RLC PDU indicates that the UE does not receive the second group of downlink RLC PDUs in the second part of the downlink RLC PDU.
  • the downlink RLC PDUs, the remaining downlink RLC PDUs except the M downlink RLC PDUs in the second group of downlink RLC PDUs are retransmitted by the first base station to the UE, where M is a positive integer and M is smaller than the number of the second group of downlink RLC PDUs.
  • the second base station when the feedback information of the downlink RLC PDU in the second part indicates that the UE does not receive the second group of downlink RLC PDUs in the second part of the downlink RLC PDU, the second base station retransmits the second group to the UE.
  • the M downlink RLC PDUs in the downlink RLC PDU, and the remaining downlink RLC PDUs except the M downlink RLC PDUs in the second group of downlink RLC PDUs are retransmitted by the first base station to the UE, which can improve the flexibility of the retransmission control.
  • the wireless strip at the second base station In case of poor condition, the retransmission efficiency can be improved.
  • the receiving unit 1410 may further receive the first retransmission information from the first base station, before the sending unit 1420 retransmits the M downlink RLC PDUs in the second group of downlink RLC PDUs to the UE.
  • the retransmission information is used to indicate that the second base station does not retransmit the remaining downlink RLC PDUs except the M downlink RLC PDUs in the second group of downlink RLC PDUs.
  • the sending unit 1420 may retransmit the M downlink RLC PDUs in the second group of downlink RLC PDUs to the UE according to the first retransmission information.
  • the sending unit 1420 may further send, to the first base station, second retransmission information, where the second retransmission information is used to instruct the first base station to retransmit the M downlink in the second group of downlink RLC PDUs.
  • the base station 1400 may further include an adjusting unit 1430.
  • the adjusting unit 1430 may adjust the first variable according to the RLC PDU status report, and delete the downlink RLC PDU of the second partial downlink RLC PDU except the second group of downlink RLC PDUs from the sending buffer, where the first variable is the first in the sending window.
  • FIG. 15 is a schematic block diagram of a UE in accordance with one embodiment of the present invention.
  • the UE 1500 includes a receiver 1510, a processor 1520, and a transmitter 1530.
  • the receiver 1510 receives the first partial downlink RLC PDU from the first base station and the second partial downlink RLC PDU from the second base station.
  • the processor 1520 generates a first RLC status report and a second RLC status report according to the receiving status of the first partial downlink RLC PDU and the receiving status of the second partial downlink RLC PDU, where the first RLC status report and the second RLC status report are both included.
  • the transmitter 1530 sends a first RLC status report to the first base station, and sends a second RLC status report to the second base station, so that the first base station determines whether to perform heavy according to the first RLC status report and the second base station according to the second RLC status report. Pass the operation.
  • the first RLC status report and the second RLC status report are respectively generated by the UE, and the first RLC status report is sent to the first base station, and the second RLC status report is sent to the second base station, so that the first base station is configured according to the second base station.
  • the first RLC status report and the second base station can determine whether to perform a retransmission operation according to the second RLC status report, so that the inter-base station cooperation scenario can be effectively implemented. Automatic retransmission of the next data.
  • the first RLC status report and the second RLC status report are generated by the UE, and the first RLC status report is sent to the first base station, and the second RLC status report is sent to the second base station, so that There is no need to forward the RLC status report or retransmission indication over the backhaul link, thereby reducing the retransmission delay of the downlink RLC PDU.
  • the receiver 1510 may further receive first configuration information from the first base station before the processor 1520 generates the first RLC status report and the second RLC status report, where the first configuration information is used to indicate The first base station transmits a first RLC status report and sends a second RLC status report to the second base station.
  • the transmitter 1530 may further send first adjustment information to the first base station according to the measurement information, where the first adjustment information is used to indicate that the proportion of the downlink RLC PDU that is sent by the second base station is adjusted, and the measurement is performed.
  • the information is used to indicate the wireless condition of the first base station and the wireless condition of the second base station.
  • the transmitter 1530 may further send the first partial uplink RLC PDU to the first base station and the second partial uplink RLC PDU to the second base station.
  • the receiver 1510 may also receive a third RLC status report from the first base station, and may receive a fourth RLC status report from the second base station, where the third RLC status report includes feedback information of the first partial uplink RLC PDU, and the fourth RLC status report The feedback information of the second part of the uplink RLC PDU is included.
  • the processor 1520 can determine whether to perform a retransmission operation according to the third RLC status report and the fourth RLC status report.
  • the third RLC state may further include feedback information of the second part of the RLC PDU.
  • the processor 1520 may further determine, according to the fourth RLC status report, whether there is a problem in the uplink of the second base station.
  • the transmitter 1530 may further send the second adjustment information to the first base station or the second adjustment information to the second base station, where the processor 1520 determines that there is a problem with the uplink of the second base station, where the second adjustment information is used. There is a problem indicating that the uplink of the second base station.
  • the processor 1520 may determine, according to the fourth RLC status, whether the number of uplink RLC PDUs not received in the second partial uplink RLC PDU is greater than a first threshold, to determine an uplink of the second base station. Is there a problem with the link? Transmitter 1530 can be everywhere The processor 1520 determines that the second adjustment information is sent to the first base station if the number of uplink RLC PDUs not received in the second partial uplink RLC PDU is greater than the first threshold.
  • FIG 16 is a schematic block diagram of a base station in accordance with one embodiment of the present invention.
  • Base station 1600 is the first base station described above.
  • Base station 1600 includes a transmitter 1610, a receiver 1620, and a processor 1630.
  • the transmitter 1610 transmits a first partial downlink RLC PDU to the UE, and transmits a second partial downlink RLC PDU to the second base station.
  • the receiver 1620 receives the first RLC status report in the two RLC status reports from the UE, where the second RLC status report in the two RLC status reports is sent by the UE to the second base station, the first RLC status report and the second
  • the RLC status report includes feedback information of the first part of the downlink RLC PDU and feedback information of the second part of the downlink RLC PDU.
  • the processor 1630 determines whether to perform a retransmission operation based on the first RLC status report.
  • the first base station receives the first RLC status report in the two RLC status reports from the UE, and determines whether to perform the retransmission operation according to the first RLC status report, so that the inter-base station cooperation scenario can be effectively implemented. Automatic retransmission of data.
  • the first RLC status report in the two RLC status reports is received by the first base station, and the second RLC status report in the two RLC status reports is sent by the UE to the second base station.
  • the RLC status report or the retransmission indication is not required to be forwarded between the base stations through the backhaul link, so that the retransmission delay of the downlink RLC PDU can be reduced.
  • the transmitter 1610 may send the first configuration information to the UE, and send the first configuration information to the second base station, if the backhaul link between the base station 1600 and the second base station does not meet the transmission requirement.
  • the receiver 1620 may receive first adjustment information from the UE or the second base station, where the first adjustment information is used to indicate that the proportion of the downlink RLC PDU that is sent by the second base station is adjusted.
  • the processor 1630 can adjust the proportion of the downlink RLC PDUs that are sent by the second base station according to the first adjustment information.
  • the processor 1630 may adjust the proportion of the downlink RLC PDUs that are sent by the second base station according to the first RLC status report.
  • the receiver 1620 may further receive the first partial uplink RLC PDU from the UE.
  • the processor 1630 may generate a third RLC status report according to the receiving status of the first part of the uplink RLC PDU, where the third RLC status report includes feedback information of the first part of the uplink RLC PDU.
  • the sender 1610 can also send a third RLC status report to the UE.
  • the receiver 1620 may further receive a second partial uplink RLC PDU from the second base station, where the second partial uplink RLC PDU is received by the second base station from the UE.
  • the processor 1630 may generate a third RLC status report according to the receiving status of the first partial uplink RLC PDU and the receiving status of the second partial uplink RLC PDU, where the third RLC status report includes feedback information of the first part of the uplink RLC PDU and the second part of the uplink Feedback information of the RLC PDU.
  • the transmitter 1610 may further send the second configuration information to the UE, and send the fourth configuration information to the second base station, where the second configuration information is used to instruct the UE to receive the fourth RLC from the second base station.
  • the status report, the fourth configuration information is used to instruct the second base station to send a fourth RLC status report to the UE.
  • the receiver 1620 may further receive second adjustment information from the UE or the second base station, where the second adjustment information is used to indicate that the second base station has an uplink problem.
  • the processor 1630 can adjust a policy for allocating uplink resources to the UE according to the second adjustment information.
  • FIG 17 is a schematic block diagram of a base station in accordance with one embodiment of the present invention.
  • the base station 1700 is the second base station described above.
  • Base station 1700 includes a transmitter 1710, a receiver 1720, and a processor 1730.
  • the transmitter 1710 transmits a second partial downlink RLC PDU to the UE.
  • the receiver 1720 receives the second RLC status report in the two RLC status reports from the UE, where the first RLC status report in the two RLC status reports is sent by the UE to the first base station, the first RLC status report and the second
  • the RLC status report includes feedback information of the first part of the downlink RLC PDU and feedback information of the second part of the downlink RLC PDU, where the first part of the downlink RLC PDU is sent by the first base station to the UE.
  • the processor 1730 can determine whether to perform a retransmission operation according to the second RLC status report.
  • the second base station receives the second RLC status report in the two RLC status reports from the UE, and determines whether to perform the retransmission operation according to the second RLC status report, so that data in the inter-base station cooperation scenario can be implemented. Automatic retransmission.
  • the second base station receives the second of the two RLC status reports from the UE.
  • the RLC status report, and the first RLC status report in the two RLC status reports is sent by the UE to the first base station, so that the base station does not need to forward the RLC status report or the retransmission indication through the backhaul link, thereby reducing the downlink RLC.
  • the retransmission delay of the PDU is not required to forward the RLC status report or the retransmission indication through the backhaul link, thereby reducing the downlink RLC.
  • the receiver 1720 may receive third configuration information from the first base station, where the third configuration information is used to instruct the second base station to determine whether to perform a retransmission operation according to the second RLC status report.
  • the processor 1730 may further determine, according to the second RLC status report, first adjustment information, where the first adjustment information is used to indicate that the proportion of the downlink RLC PDU that is sent by the second base station is adjusted.
  • the transmitter 1710 can also send the first adjustment information to the first base station.
  • the receiver 1720 may further receive the second part of the uplink RLC PDU from the UE.
  • the processor 1730 may generate a fourth RLC status report according to the receiving status of the second part of the uplink RLC PDU, where the fourth RLC status report includes feedback information of the second part of the uplink RLC PDU.
  • Transmitter 1720 can send a fourth RLC status report to the UE.
  • the receiver 1720 may further receive fourth configuration information from the first base station, where the fourth configuration information is used to instruct the second base station to send a fourth RLC status report to the UE.
  • the processor 1730 may further determine second adjustment information according to the sounding reference signal of the UE, or the receiver 1720 may further receive second adjustment information from the UE, where the second adjustment information is used to indicate There is a problem with the uplink of the two base stations.
  • the transmitter 1710 can also transmit second adjustment information to the first base station.
  • the transmitter 1810 sends the first partial downlink RLC PDU to the UE, and sends the second partial downlink RLC PDU to the second base station, so that the second base station sends the second partial downlink RLC PDU to the UE.
  • Receiver 1820 can receive an RLC status report, where the RLC status report includes feedback information for the second portion of the downlink RLC PDU.
  • the transmitter 1810 may further retransmit the second group of downlink RLC PDUs to the UE if the feedback information of the second part of the downlink RLC PDU indicates that the UE does not receive the second group of downlink RLC PDUs in the second part of the downlink RLC PDU. At least one downstream RLC PDU.
  • the UE is indicated by the feedback information of the downlink RLC PDU in the second part. If the second group of downlink RLC PDUs in the second part of the downlink RLC PDU are not received, the first base station retransmits at least one downlink RLC PDU in the second group of downlink RLC PDUs to the UE, which can improve the flexibility of retransmission control. And the retransmission efficiency can be improved in the case where the radio conditions of the second base station are not good.
  • the transmitter 1810 may retransmit the second group of downlink RLC PDILs to the UE if the number of the second group of downlink RLC PDUs is greater than the second threshold.
  • the transmitter 1810 may retransmit the first variable in the second group of downlink RLC PDUs to the UE, after the timer associated with the first variable expires, and the first variable has not been updated.
  • the transmitter 1810 may retransmit the first variable in the second group of downlink RLC PDUs to the UE if the difference between the first variable and the second variable is the third threshold.
  • the downlink RLC PDU where the first variable is the smallest sequence number in the sequence number of the downlink RLC PDU to be acknowledged in the second part of the downlink RLC PDU in the transmission window, and the second variable is the sequence of the downlink RLC PDU to be transmitted in the transmission window. number.
  • the transmitter 1810 may further send, to the second base station, first retransmission information, where the first retransmission information is used to indicate that the second base station does not retransmit at least one of the second group of downlink RLC PDUs. Downstream RLC PDU.
  • the receiver 1820 may further receive second retransmission information from the second base station, where the second retransmission information is used to indicate that the first base station retransmits at least one of the second group of downlink RLC PDUs.
  • the downlink RLC PDIL transmitter 1810 may retransmit at least one downlink RLC PDU of the second group of downlink RLC PDUs to the UE according to the second retransmission information.
  • FIG. 19 is a schematic block diagram of a base station according to another embodiment of the present invention.
  • the base station 1900 is the above second base station.
  • Base station 1900 includes a receiver 1910 and a transmitter 1920.
  • Receiver 1910 receives a second portion of downlink RLC PDUs from the first base station.
  • Transmitter 1920 transmits a second partial downlink RLC PDU to the UE.
  • Receiver 1910 also receives an RLC status report from the UE, wherein the RLC status report includes feedback information for the second portion of the downlink RLC PDU.
  • the transmitter 1920 further retransmits the second group of downlink RLCs to the UE if the feedback information of the second part of the downlink RLC PDU indicates that the UE does not receive the second group of downlink RLC PDUs in the second part of the downlink RLC PDU.
  • M downlink RLC PDUs in the PDU, and the remaining downlink RLC PDUs except the M downlink RLC PDUs in the second group of downlink RLC PDUs are retransmitted by the first base station to the UE, where M is a positive integer and M is smaller than the second group of downlink RLCs The number of PDUs.
  • the second base station when the feedback information of the downlink RLC PDU in the second part indicates that the UE does not receive the second group of downlink RLC PDUs in the second part of the downlink RLC PDU, the second base station retransmits the second group to the UE.
  • the M downlink RLC PDUs in the downlink RLC PDU, and the remaining downlink RLC PDUs except the M downlink RLC PDUs in the second group of downlink RLC PDUs are retransmitted by the first base station to the UE, which can improve the flexibility of the retransmission control. And the retransmission efficiency can be improved in the case where the radio conditions of the second base station are not good.
  • the receiver 1910 may further receive the first retransmission information from the first base station, before the transmitter 1920 retransmits the M downlink RLC PDUs in the second group of downlink RLC PDUs to the UE.
  • the retransmission information is used to indicate that the second base station does not retransmit the first retransmission information of the second group of downlink RLC PDUs, and retransmits the M downlink RLC PDUs in the second group of downlink RLC PDUs to the UE.
  • the transmitter 1920 may further send second retransmission information to the first base station, where the second retransmission information is used to instruct the first base station to retransmit the downlink of the second group of downlink RLC PDUs.
  • the base station 1900 may further include a processor 1930.
  • processor 1930 may further include a processor 1930.
  • the first variable may be adjusted according to the RLC PDU status report, and the downlink RLC PDU except the second group of downlink RLC PDUs in the second part of the downlink RLC PDU is deleted from the sending buffer, where the first variable is the second part of the sending window.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
  • the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.
  • the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiment.
  • the functions, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium.
  • the technical solution of the present invention which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. .

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Abstract

L'invention porte sur un procédé de retransmission automatique, un équipement d'utilisateur et une station de base. Le procédé selon l'invention comprend : la réception, par un équipement d'utilisateur (UE), d'une première unité PDU RLC partielle de liaison descendante en provenance d'une première station de base et la réception, par l'équipement UE, d'une deuxième unité PDU RLC partielle de liaison descendante en provenance d'une deuxième station de base; la génération, par l'équipement UE, d'un premier rapport d'état RLC et d'un deuxième rapport d'état RLC en fonction de l'état de réception de la première unité PDU RLC partielle de liaison descendante et l'état de réception de la deuxième unité PDU RLC partielle de liaison descendante, le premier rapport d'état RLC et le deuxième rapport d'état RLC contenant tous deux un retour d'information sur la première unité PDU RLC partielle de liaison descendante et un retour d'information sur la deuxième unité PDU RLC partielle de liaison descendante; et la transmission, par l'équipement UE, du premier rapport d'état RLC à la première station de base et du deuxième rapport d'état RLC à la deuxième station de base. Le mode de réalisation de la présente invention permet d'assurer une retransmission automatique efficace de données dans le contexte d'une coordination entre des stations de base.
PCT/CN2013/081006 2013-08-07 2013-08-07 Procédé de retransmission automatique, équipement d'utilisateur et station de base Ceased WO2015018009A1 (fr)

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