RU2671845C1 - Data transmission method, base station and user equipment - Google Patents

Abstract

FIELD: wireless communication equipment.

SUBSTANCE: invention relates to wireless communication. Method comprises: sending by a first base station of a request to a second base station for configuring a second cell, comprising information on the configuration of a DRB radio channel containing the quality of service parameter QoS of an enhanced E-RAB radio access channel and a DRB identifier. Reception by the first base station of a response from the second base station, containing information about the resources of the second cell; sending by the first base station of information of the resources of the second cell to the UE; receiving by the first base station of an RRC connection reconfiguration completion message from the UE; sending by the first base station of a configuration completion message to the second base station; and the first base station separates the DRB data that has been sent to the second base station.

EFFECT: technical result consists in better separation of DRB data sent to the second base station.

10 cl, 40 dwg

Description

FIELD OF TECHNOLOGY

[0001] The present invention relates to the field of communication technology, and in particular to a method for transmitting data, to a base station, and to user equipment.

BACKGROUND

[0002] With the corresponding development of mobile communication technologies and broadband wireless access, the services of the two technologies penetrate deeply into each other. In order to satisfy the demands of mobile broadband and solve the complex problems of mobile broadband, the working group of the third generation partnership project (3rd generation partnership project, 3GPP) raises higher performance requirements for communication systems, for example, higher requirements for peak speed and system bandwidth. To meet these requirements, the Advanced Long Term Evolution (Advanced Long Term Evolution, LTE-A) 3GPP system represents carrier aggregation (carrier aggregation, CA).

[0003] With CA, a large bandwidth can be obtained by aggregating multiple continuous or discontinuous component carriers (component carriers, CC), thereby improving the peak data rate and system throughput, as well as solving the problem of discontinuous operator spectra. A user equipment (user equipment, UE) may support aggregation of multiple CCs in the uplink and in the downlink individually, and the CCs may be in the same range (s) or in different ranges. CCs aggregated by a UE are provided by the same base station, for example, a plurality of CCs located in one place are provided by a base station, or a plurality of CCs not located in one place are separately provided by a base station and remote radio equipment (remote radio equipment, RRH) base station.

[0004] Conventional LTE-A technology only supports CC aggregation provided by the same base station, and CA cannot be performed when CC different base stations have a common coverage area. Therefore, a UE located in the common CC coverage area of various base stations requires handover (handover) to a cell (cell) with good radio conditions during the movement procedure, and the handover procedure may delay or interrupt the service, and may reduce peak speed and bandwidth.

SUMMARY OF THE INVENTION

[0005] Embodiments of the present invention provide a data transmission method, a base station, and user equipment that can improve the peak speed and throughput of the UE.

[0006] According to a first aspect, a data transmission method is provided, including: generating, using a first base station, protocol data units PDU of a downlink RLC radio link control; sending, with the first base station, the first part of the downlink RLC PDUs to the downlink RLC PDUs to the user equipment UE and sending the second part of the downlink RLC PDUs to the downlink RLC PDUs to the second base station so that the second base station sends the second part of the downlink RLC PDU in the UE.

[0007] With reference to the first aspect, in a first possible embodiment, the method further includes: receiving, with the first base station, from the UE the first part of the uplink RLC PDUs in the uplink RLC PDUs generated by the UE, and receiving from the second the base station of the second part of the uplink RLC PDUs in the uplink RLC PDUs, wherein the second part of the uplink RLC PDUs is received by the second base station from the UE.

[0008] With reference to the first aspect, in a second possible embodiment, the method further includes: receiving, with the first base station, a first RLC status report from the UE; when the first RLC status report indicates RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs, retransmission by the first base station to the RLC UEs to be retransmitted in the first part of the downlink RLC PDUs; and sending, with the first base station, the first RLC status report to the second base station, the first RLC status report indicating RLC PDUs to be retransmitted in the second part of the downlink RLC PDU, or sending a retransmission message with the first base station to a second base station, wherein a retransmission message is generated by the first base station according to the first RLC status report, and the retransmission message indicates RLC PDUs to be retransmitted in the second part of the downlink RLC PDU.

[0009] With reference to the first aspect, in a third possible embodiment, the method further includes: receiving, with the first base station, a first RLC status report from a second base station, wherein the first RLC status report is received using the second base station from the UE; determining using the first base station according to the first RLC status report RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs; and retransmission to the UE with the first base station RLC PDUs that are to be retransmitted in the first part of the downlink RLC PDU.

[0010] With reference to a first possible embodiment of the first aspect, a fourth possible embodiment, the method further includes: generating, with a first base station, a second RLC status report according to reception situations of a first part of an uplink RLC PDU and a second part of an uplink RLC PDU communication lines and sending to the UE the second RLC status report; and receiving, with the first base station, an RLC PDU in the uplink retransmission set determined by the UE according to the second RLC status report, wherein the uplink retransmission set includes RLC PDUs to be retransmitted in the first part of the RLC PDU uplink communication, and / or RLC PDUs to be retransmitted in the second part of the uplink RLC PDU.

[0011] With reference to a fourth possible embodiment of the first aspect, the fifth possible embodiment, receiving with the first base station an RLC PDU in an uplink retransmission set determined by the UE according to the second RLC status report, includes: receiving using the first RLC PDU base station in the uplink retransmission set from the UE; or receiving, with the first base station, an RLC PDU in the first subset of the uplink retransmission from the UE, and receiving an RLC PDU in the second subset of the uplink retransmission from the second base station, wherein the RLC PDUs in the second subset of the uplink retransmission are received from using the second base station from the UE, and the first subset of the uplink retransmission and the second subset of the uplink retransmission is obtained by the UE by dividing the uplink retransmission set research institutes of communication; or receiving, with the first base station, an RLC PDU in the uplink retransmission set from the second base station, wherein the RLC PDUs in the uplink retransmission set are received using the second base station from the UE.

[0012] According to a second aspect, a data transmission method is provided, including: receiving, by a second base station, from a first base station a second portion of a downlink RLC PDU in a protocol data unit of a downlink RLC radio control PDU generated by a first base station and sending, using the second base station, the second part of the downlink RLC PDU to the user equipment UE.

[0013] With reference to the second aspect, in a first possible embodiment, the method further includes: receiving, by the second base station, from the UE the second portion of the uplink RLC PDUs in the uplink RLC PDUs generated by the UE; and sending, using the second base station, the second part of the uplink RLC PDU to the first base station.

[0014] With reference to the second aspect, in a second possible embodiment, the method further includes: receiving, with the second base station, a first RLC status report from the first base station, determining according to the first RLC status report RLC PDUs to be retransmitted to a second part of the downlink RLC PDUs, and retransmission to the ULCs of the RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs; or receiving, using the second base station, a retransmission message from the first base station, and retransmission to the UE according to the retransmission message of the RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs, the first retransmission message indicating RLC PDUs that must be retransmitted in the second part of the downlink RLC PDU.

[0015] With reference to the second aspect, in a third possible embodiment, the method further includes: receiving, with a second base station, a first RLC status report from the UE; sending, by the second base station, the first RLC status report to the first base station so that when the first RLC status report indicates RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs, the first base station retransmits the RLC PDUs to the UE to be retransmitted in the first part of the downlink RLC PDU; and when the first RLC status report indicates RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs, retransmission to the UE by the second base station RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs.

[0016] With reference to a first possible embodiment of the second aspect, a fourth possible embodiment, the method further includes: receiving, with the second base station, an RLC PDU in the uplink retransmission set from the UE, and sending an RLC PDU in the uplink retransmission set lines of communication to the first base station, wherein the uplink retransmission set includes RLC PDUs that are to be retransmitted in the first part of the uplink RLC PDUs and / or RLC PDUs that are to be retransmitted tsya second part PDU RLC uplink; or receiving, with the second base station, an RLC PDU in the second subset of the uplink retransmission from the UE, and sending the RLC PDUs in the second subset of the uplink retransmission to the first base station, wherein the second subset of the uplink retransmission is obtained by the UE using dividing the uplink retransmission set.

[0017] According to a third aspect, a data transmission method is provided, including: receiving, using a user equipment UE, from a first base station a first portion of a downlink RLC PDU in protocol data units of a downlink RLC radio control PDU generated by the first base stations, and receiving from the second base station the second part of the downlink RLC PDUs in the downlink RLC PDUs, wherein the second part of the downlink RLC PDUs are received using the second base station from the first bases station.

[0018] With reference to a third aspect, in a first possible embodiment, the method further includes: generating, with the UE, an uplink RLC PDU; and sending, using the UE, the first part of the uplink RLC PDUs to the uplink RLC PDUs to the first base station and sending the second part of the uplink RLC PDUs to the uplink RLC PDUs to the second base station.

[0019] With reference to a third aspect, in a second possible embodiment, the method further includes: generating, by the UE, a first RLC status report according to reception situations of a first part of a downlink RLC PDU and a second part of a downlink RLC PDU, the first report the RLC status indicates RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs and / or RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs; sending, using the UE, the first RLC status report to the first base station or to the second base station; and receiving, by the UE, RLC PDUs that are to be retransmitted in the first part of the downlink RLC PDUs from the first base station, and / or receiving RLC PDUs that are to be retransmitted in the second part of the downlink RLC PDUs from the second base station.

[0020] With reference to a first possible embodiment of the third aspect, a fourth possible embodiment, the method further includes: receiving, by the UE, a second RLC status report from the first base station; determining by the UE the uplink retransmission set according to the second RLC status report, wherein the uplink retransmission set includes RLC PDUs to be retransmitted in the first part of the uplink RLC PDUs and / or RLC PDUs which should be retransmitted in the second part of the uplink RLC PDUs; sending an RLC UE PDU in the uplink retransmission set to the first base station, or sending an RLC PDU in the uplink retransmission set to the second base station, or sending an RLC PDU in the first subset of the uplink retransmission to the first base station and sending the RLC PDUs in the second subset of the uplink retransmission to the second base station, wherein the first subset of the uplink retransmission and the second subset of the uplink retransmission ides are obtained by the UE by dividing the uplink retransmission set.

[0021] According to a fourth aspect, a base station is provided, including: a generating unit configured to generate protocol data units of a downlink RLC radio link control PDU; a sending unit configured to send the first part of the downlink RLC PDU to the downlink RLC PDUs to the user equipment UE and to send the second part of the downlink RLC PDUs to the downlink RLC PDU to the second base station so that the second base station sends in the UE, the second part of the downlink RLC PDU.

[0022] With reference to a fourth aspect, in a first possible embodiment, the base station further includes: a first receiving unit configured to receive from the UE a first portion of the uplink RLC PDUs in the uplink RLC PDUs generated by the UE and receive from the second base station of the second part of the uplink RLC PDUs in the uplink RLC PDUs, the second part of the uplink RLC PDUs being received by the second base station from the UE.

[0023] With reference to a fourth aspect, in a second possible embodiment, the base station further includes: a second receiving unit, the second receiving unit being configured to receive a first RLC status report from the UE; the sending unit is further configured: when the first RLC status report indicates RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs, retransmitted to the RLC UUs to be retransmitted in the first part of the downlink RLC PDUs; and the sending unit is further configured to send a first RLC status report to the second base station, the first RLC status report indicating RLC PDUs to be retransmitted in the second part of the downlink RLC PDU, or to send a retransmission message to the second base station wherein the retransmission message is generated by the first base station according to the first RLC status report, and the retransmission message indicates the RLC PDUs to be retransmitted in the second hour STI PDU RLC downlink.

[0024] With reference to a fourth aspect, in a third possible embodiment, the base station further includes a third reception unit and a first determination unit, the third receiving unit being configured to receive a first RLC status report from a second base station, the first RLC status report received by the second base station from the UE; the first determining unit is configured to determine according to the first RLC status report RLC PDUs to be retransmitted in the first part of the downlink RLC PDU; and the sending unit is further configured to retransmit to the RLC PDUs UE, which are to be retransmitted in the first part of the downlink RLC PDUs.

[0025] With reference to a first possible embodiment of the fourth aspect, in a fourth possible embodiment, the base station further includes a fourth receiving unit, the generating unit being further configured to generate a second RLC status report according to reception situations of the first portion of the uplink RLC PDU and the second part of the uplink RLC PDU, and the sending unit is further configured to send a second RLC status report to the UE; and the fourth receiving unit is configured to receive RLC PDUs in the uplink retransmission set determined by the UE according to the second RLC status report, wherein the uplink retransmission set includes RLC PDUs to be retransmitted in the first part of the RLC PDU uplink communication, and / or RLC PDUs to be retransmitted in the second part of the uplink RLC PDU.

[0026] With reference to the fourth possible embodiment of the fourth aspect, the fifth possible embodiment of the fourth receiving unit is specifically configured to receive RLC PDUs in the uplink retransmission set from the UE; or for receiving RLC PDUs in the first subset of the uplink retransmission from the UE and for receiving RLC PDUs in the second subset of the uplink retransmission from the second base station, wherein the RLC PDUs in the second subset of the uplink retransmission are received using the second base station from the UE, and the first uplink retransmission subset and the second uplink retransmission subset are obtained by the UE by dividing the uplink retransmission set; or for receiving RLC PDUs in the uplink retransmission set from the second base station, wherein RLC PDUs in the uplink retransmission set are received using the second base station from the UE.

[0027] According to a fifth aspect, a base station is provided, including: a reception unit configured to receive a second portion of a downlink RLC PDU from a first base station in a downlink RLC radio link control PDU data units generated by a first base station ; and a sending unit configured to send the second part of the downlink RLC PDU to the user equipment UE.

[0028] With reference to the fifth aspect, in a first possible embodiment, the reception unit is further configured to receive from the UE the second part of the uplink RLC PDUs in the uplink RLC PDUs generated by the UE; and the sending unit is further configured to send the second part of the uplink RLC PDU to the first base station.

[0029] With reference to the fifth aspect, in a second possible embodiment, the base station further includes a first determination unit, wherein the reception unit is further configured to receive a first RLC status report from the first base station, the first determination unit is configured to determine according to the first report the state of the RLC RLC PDUs that are to be retransmitted in the second part of the downlink RLC PDUs, and the sending unit is further configured to retransmit to the RLC UE PDUs that are to be retransmitted transmitted in the second part of the downlink RLC PDU; or the receiving unit is further configured to receive the retransmission message from the first base station, and the sending unit is further configured to retransmit to the UE according to the retransmission message of the RLC PDUs to be retransmitted in the second part of the downlink RLC PDU, the first retransmission message indicates the RLC PDUs to be retransmitted in the second part of the downlink RLC PDU.

[0030] With reference to the fifth aspect, in a third possible embodiment, the reception unit is further configured to receive a first RLC status report from the UE; and the sending unit is further configured to send the first RLC status report to the first base station so that when the first RLC status report indicates RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs, the first base station retransmits PDUs to the UE RLCs to be retransmitted in the first part of the downlink RLC PDU; and the sending unit is further configured: when the first RLC status report indicates RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs, are retransmitted to the UE RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs.

[0031] With reference to a first possible embodiment of the fifth aspect, a fourth possible embodiment, the reception unit is further configured to receive RLC PDUs in the uplink retransmission set from the UE, and the sending unit is further configured to send RLC PDUs in the uplink retransmission set communication to the first base station, wherein the uplink retransmission set includes RLC PDUs that are to be retransmitted in the first part of the uplink RLC PDUs and / or RLC PDUs that are up to false are retransmitted in the second part of the uplink RLC PDUs; or the receiving unit is further configured to receive RLC PDUs in the second subset of the uplink retransmission from the UE, and the sending unit is further configured to send RLC PDUs in the second subset of the uplink retransmission to the first base station, the second subset of the uplink retransmission obtained by the UE by dividing the uplink retransmission set.

[0032] According to a sixth aspect, user equipment is provided, including: a reception unit configured to receive from a first base station a first portion of a downlink RLC PDU in a downlink RLC radio link control PDU data blocks generated by a first base station and for receiving from the second base station a second part of the downlink RLC PDUs in the downlink RLC PDUs, the second part of the downlink RLC PDUs being received by the second base station from th base station; and a first generation unit configured to reassemble the first part of the downlink RLC PDUs and the second part of the downlink RLC PDUs to form service data downlink RLC SDUs.

[0033] With reference to a sixth aspect, in a first possible embodiment, the user equipment further includes: a first sending unit, the first generating unit being further configured to generate an uplink RLC PDU; and the first sending unit is configured to send the first part of the uplink RLC PDUs to the uplink RLC PDUs to the first base station and to send the second part of the uplink RLC PDUs to the uplink RLC PDUs to the second base station.

[0034] With reference to a sixth aspect, in a second possible embodiment, the user equipment further includes a second generation unit and a second sending unit, the second generation unit being configured to generate a first RLC status report according to reception situations of the first part of the downlink RLC PDUs and the second part of the downlink RLC PDUs, the first RLC status report indicating RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs and / or RLC PDUs to be retransmitted redavatsya second part PDU RLC downlink; the second sending unit is configured to send the first RLC status report to the first base station or to the second base station; and the receiving unit is further configured to receive RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs from the first base station and / or to receive RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs from the second base station.

[0035] With reference to a first possible embodiment of the sixth aspect, a third possible embodiment, the user equipment further includes a determining unit and a third sending unit, the receiving unit being further configured to receive a second RLC status report from the first base station; the determining unit is configured to determine the uplink retransmission set according to the second RLC status report, wherein the uplink retransmission set includes RLC PDUs to be retransmitted in the first part of the uplink RLC PDU and / or RLC PDU, which should be retransmitted in the second part of the uplink RLC PDUs; and the third sending unit is configured to send the RLC PDUs in the uplink retransmission set to the first base station, or to send the RLC PDUs in the uplink retransmission set to the second base station, or to send the RLC PDUs in the first uplink retransmission set communicating to the first base station and sending RLC PDUs in the second subset of the uplink retransmission to the second base station, wherein the first subset of the uplink retransmission and the second subset of the retransmission uplink transmissions are obtained by the UE by dividing the uplink retransmission set.

[0036] According to a seventh aspect, a base station is provided, including: a processor configured to generate protocol data units of a downlink RLC radio link control PDU; a transmitter configured to send the first part of the downlink RLC PDUs to the downlink RLC PDUs to the user equipment UE and to send the second part of the downlink RLC PDUs to the downlink RLC PDU to the second base station so that the second base station sends to UE is the second part of the downlink RLC PDU.

[0037] With reference to a seventh aspect, in a first possible embodiment, the base station further includes: a receiver configured to receive from the UE the first portion of the uplink RLC PDUs in the uplink RLC PDUs generated by the UE and receive from the second the base station of the second part of the uplink RLC PDUs in the uplink RLC PDUs, wherein the second part of the uplink RLC PDUs is received by the second base station from the UE.

[0038] With reference to a seventh aspect, in a second possible embodiment, the base station further includes a receiver, the receiver being configured to receive a first RLC status report from the UE; the transmitter is further configured: when the first RLC status report indicates RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs, retransmitted to the UE RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs; and the transmitter is further configured to send the first RLC status report to the second base station, wherein the first RLC status report indicates RLC PDUs to be retransmitted in the second part of the downlink RLC PDU, or send a retransmission message that is generated by the base station according to the first RLC status report, to the second base station, the retransmission message indicating RLC PDUs to be retransmitted in the second part of the downlink RLC PDU.

[0039] With reference to a seventh aspect, in a third possible embodiment, the base station further includes a receiver, the receiver being configured to receive a first RLC status report from a second base station, wherein the first RLC status report is received by a second base station from the UE ; the processor is further configured to determine according to the first RLC status report RLC PDUs to be retransmitted in the first part of the downlink RLC PDU; and the transmitter is further configured to retransmit to the RLC UE PDUs that are to be retransmitted in the first part of the downlink RLC PDU.

[0040] With reference to a first possible embodiment of the seventh aspect, in a fourth possible embodiment, the processor is further configured to generate a second RLC status report according to reception situations of the first part of the uplink RLC PDU and the second part of the uplink RLC PDU, and the transmitter is further configured for sending to the UE a second RLC status report; and the receiver is further configured to receive RLC PDUs in the uplink retransmission set determined by the UE according to the second RLC status report, wherein the uplink retransmission set includes RLC PDUs to be retransmitted in the first part of the uplink RLC PDU communication lines and / or RLC PDUs to be retransmitted in the second part of the uplink RLC PDU.

[0041] With reference to a fourth possible embodiment of the seventh aspect, in a fifth possible embodiment, the receiver is specifically configured to receive RLC PDUs in the uplink retransmission set from the UE; or for receiving RLC PDUs in the first subset of the uplink retransmission from the UE and for receiving RLC PDUs in the second subset of the uplink retransmission from the second base station, wherein the RLC PDUs in the second subset of the uplink retransmission are received using the second base station from the UE, and the first uplink retransmission subset and the second uplink retransmission subset are obtained by the UE by dividing the uplink retransmission set; or for receiving RLC PDUs in the uplink retransmission set from the second base station, wherein RLC PDUs in the uplink retransmission set are received using the second base station from the UE.

[0042] According to an eighth aspect, a base station is provided, including: a receiver configured to receive from a first base station a second portion of a downlink RLC PDU in the downlink RLC radio link control PDU data blocks generated by the first base station; and a transmitter configured to send the second part of the downlink RLC PDU to the user equipment UE.

[0043] With reference to the eighth aspect, in a first possible embodiment, the receiver is further configured to receive from the UE a second portion of the uplink RLC PDUs in the uplink RLC PDUs generated by the UE; and the transmitter is further configured to send the second part of the uplink RLC PDU to the first base station.

[0044] With reference to the eighth aspect, in a second possible embodiment, the base station further includes a processor, wherein the receiver is further configured to receive a first RLC status report from the first base station, the processor is configured to determine, according to the first RLC status report, RLC PDUs, which are to be retransmitted in the second part of the downlink RLC PDUs, and the transmitter is further configured to retransmit to the RLC UEs to be retransmitted in the second part of the PDU Downlink RLC; or the receiver is further configured to receive the retransmission message from the first base station, and the transmitter is further configured to retransmit to the UE according to the retransmission message of the RLC PDUs to be retransmitted in the second part of the downlink RLC PDU, the first retransmission message indicating the PDU RLCs to be retransmitted in the second part of the downlink RLC PDU.

[0045] With reference to the eighth aspect, in a third possible embodiment, the receiver is further configured to receive a first RLC status report from the UE; and the transmitter is further configured to send the first RLC status report to the first base station so that when the first RLC status report indicates RLC PDUs to be retransmitted in the first part of the downlink RLC PDU, the first base station retransmits the RLC PDUs to the UE to be retransmitted in the first part of the downlink RLC PDU; and the transmitter is further configured: when the first RLC status report indicates RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs, are retransmitted to the UE RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs.

[0046] With reference to a first possible embodiment of the eighth aspect, in a fourth possible embodiment, the receiver is further configured to receive RLC PDUs in the uplink retransmission set from the UE, and the transmitter is further configured to send RLC PDUs in the uplink retransmission set in a first base station, wherein the uplink retransmission set includes RLC PDUs that must be retransmitted in the first part of the uplink RLC PDUs and / or RLC PDUs that must s retransmitted in the second part of the uplink RLC PDUs; or the receiver is further configured to receive RLC PDUs in the second uplink retransmission subset from the UE, and the transmitter is further configured to send RLC PDUs in the second uplink retransmission subset to the first base station, wherein the second uplink retransmission subset is obtained from by the UE by dividing the uplink retransmission set.

[0047] According to a ninth aspect, user equipment is provided, including: a receiver configured to receive from a first base station a first portion of a downlink RLC PDU in protocol data units of a downlink RLC radio control PDU generated by the first base station , and receives from the second base station a second part of the downlink RLC PDUs in the downlink RLC PDUs, the second part of the downlink RLC PDUs being received by the second base station from the first th base station; and a processor configured to reassemble the first part of the downlink RLC PDUs and the second part of the downlink RLC PDUs to form service data downlink RLC SDUs.

[0048] With reference to a ninth aspect, in a first possible embodiment, the user equipment further includes a transmitter, the processor further configured to generate uplink RLC PDUs; and the transmitter is configured to send the first part of the uplink RLC PDUs to the uplink RLC PDUs to the first base station and to send the second part of the uplink RLC PDUs to the uplink RLC PDUs to the second base station.

[0049] With reference to a ninth aspect, in a second possible embodiment, the user equipment further includes a transmitter, wherein the processor is further configured to generate a first RLC status report according to reception situations of a first part of a downlink RLC PDU and a second part of a downlink RLC PDU wherein the first RLC status report indicates RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs and / or RLC PDUs to be retransmitted in the second part of the PDUs Downlink RLC; the transmitter is configured to send a first RLC status report to the first base station or to the second base station; and the receiver is further configured to receive RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs from the first base station and / or to receive RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs from the second base station.

[0050] With reference to a first possible embodiment of the ninth aspect, in a third possible embodiment, the receiver is further configured to receive a second RLC status report from the first base station; the processor is further configured to determine an uplink retransmission set according to the second RLC status report, wherein the uplink retransmission set includes RLC PDUs to be retransmitted in the first part of the uplink RLC PDU and / or RLC PDUs, which should be retransmitted in the second part of the uplink RLC PDUs; and the transmitter is further configured to send the RLC PDUs in the uplink retransmission set to the first base station, or to send the RLC PDUs in the uplink retransmission set to the second base station, or to send the RLC PDUs in the first uplink retransmission subset to the first base station and for sending RLC PDUs in the second subset of the uplink retransmission to the second base station, the first subset of the uplink retransmission and the second subset retry Uplink transmissions are obtained by the UE by dividing the uplink retransmission set.

[0051] In embodiments of the present invention, the first base station sends the first part of the downlink RLC PDUs to the downlink RLC PDUs to the UE, and sends the second part of the downlink RLC PDUs to the second base station to the downlink RLC PDU, and the second the base station sends the second part of the downlink RLC PDUs to the UE so that the first base station and the second base station have the ability to send data together to the UE, thereby improving the peak speed and throughput of the UE.

BRIEF DESCRIPTION OF THE DRAWINGS

[0052] To describe the technical solutions in embodiments of the present invention more clearly, the following briefly presents the accompanying drawings required to describe embodiments of the present invention. Obviously, the accompanying drawings in the following description merely show some embodiments of the present invention, and one skilled in the art can still obtain other drawings according to these accompanying drawings without creative efforts.

[0053] FIG. 1a is a schematic diagram of an example scenario in which an embodiment of the present invention may be applied;

[0054] FIG. 1b is a schematic diagram of another example scenario in which an embodiment of the present invention may be applied;

[0055] FIG. 1c is a schematic diagram of another example scenario in which an embodiment of the present invention may be applied;

[0056] FIG. 1d is a schematic diagram of another example scenario in which an embodiment of the present invention may be applied;

[0057] FIG. 2a is a schematic flowchart of a data transmission method according to an embodiment of the present invention;

[0058] FIG. 2b is a schematic flowchart of a data transmission method according to an embodiment of the present invention;

[0059] FIG. 3 is a schematic flowchart of a data transmission method according to an embodiment of the present invention;

[0060] FIG. 4 is a schematic flowchart of a data transmission method according to an embodiment of the present invention;

[0061] FIG. 5 is a schematic diagram of a data transmission procedure according to an embodiment of the present invention;

[0062] FIG. 6 is a schematic flowchart of a data sharing configuration procedure according to an embodiment of the present invention;

[0063] FIG. 7 is a schematic diagram of a data transmission procedure according to an embodiment of the present invention;

[0064] FIG. 8 is a schematic flowchart of a data sharing configuration procedure according to an embodiment of the present invention;

[0065] FIG. 9 is a schematic diagram of an example protocol stack of a control plane according to an embodiment of the present invention;

[0066] FIG. 10 is a schematic diagram of an example user plane protocol stack according to an embodiment of the present invention;

[0067] FIG. 11 is a schematic block diagram of a level 2 protocol stack of a macro base station according to an embodiment of the present invention;

[0068] FIG. 12 is a schematic block diagram of a level 2 protocol stack of a micro base station according to an embodiment of the present invention;

[0069] FIG. 13 is a schematic block diagram of a layer 2 in a protocol stack of a UE according to an embodiment of the present invention;

[0070] FIG. 14 is a schematic flowchart of a procedure of a data transmission method according to an embodiment of the present invention;

[0071] FIG. 15 is a schematic flowchart of a downlink signal retransmission procedure according to an embodiment of the present invention;

[0072] FIG. 16 is a schematic flowchart of a downlink signal retransmission procedure according to an embodiment of the present invention;

[0073] FIG. 17 is a schematic flowchart of a procedure of a data transmission method according to an embodiment of the present invention;

[0074] FIG. 18 is a schematic flowchart of an uplink data retransmission procedure according to an embodiment of the present invention;

[0075] FIG. 19 is a schematic flowchart of an uplink data retransmission procedure according to an embodiment of the present invention;

[0076] FIG. 20 is a schematic flowchart of an uplink data retransmission procedure according to an embodiment of the present invention;

[0077] FIG. 21 is a schematic flowchart of an RRC connection re-creation procedure according to an embodiment of the present invention;

[0078] FIG. 22 is a schematic structural diagram of a base station according to an embodiment of the present invention;

[0079] FIG. 23 is a schematic structural diagram of a base station according to an embodiment of the present invention;

[0080] FIG. 24 is a schematic block diagram of a UE according to an embodiment of the present invention;

[0081] FIG. 25 is a schematic structural diagram of a base station according to an embodiment of the present invention;

[0082] FIG. 26 is a schematic structural diagram of a base station according to an embodiment of the present invention;

[0083] FIG. 27 is a schematic block diagram of a UE according to an embodiment of the present invention;

[0084] FIG. 28 is a schematic structural diagram of a base station according to an embodiment of the present invention;

[0085] FIG. 29 is a schematic structural diagram of a base station according to an embodiment of the present invention;

[0086] FIG. 30 is a schematic structural diagram of a UE according to an embodiment of the present invention;

[0087] FIG. 31 is a schematic flowchart of a cell resource management method according to an embodiment of the present invention;

[0088] FIG. 32 is a schematic flowchart of a cell resource management method according to an embodiment of the present invention;

[0089] FIG. 33 is a schematic flowchart of a cell resource management method according to an embodiment of the present invention;

[0090] FIG. 34 is a schematic flowchart of a cell resource management method according to an embodiment of the present invention;

[0091] FIG. 35 is a schematic flowchart of an uplink power adjustment method according to an embodiment of the present invention; and

[0092] FIG. 36 is a schematic flowchart of an uplink power adjustment method according to an embodiment of the present invention.

Description of Embodiments

[0093] The following clearly describes technical solutions in embodiments of the present invention with reference to the accompanying drawings in embodiments of the present invention. Obviously, the embodiments that will be described are simply part, not all, of the embodiments of the present invention. All other embodiments obtained by one skilled in the art, based on the embodiments of the present invention without creative efforts, should be within the protection scope of the present invention.

[0094] The following examples are used to describe in detail a scenario in which embodiments of the present invention may be applied. It should be noted that these examples are merely intended to help one skilled in the art better understand the embodiments of the present invention, but are not intended to limit the scope of the embodiments of the present invention.

[0095] FIG. 1a is a schematic diagram of an example scenario in which an embodiment of the present invention can be applied.

[0096] FIG. 1a may be an LTE-A system scenario. In FIG. 1a, a macro base station (macro eNB (eNodeB)) 110a may have CC1 whose frequency is f1, a micro base station (pico eNB) 120a may have CC2 whose frequency is f2, and the coverage area of CC2 may be within the coverage area of CC1. UE 130a may be located in the area covered by CC2, that is, located in a common coverage area of CC1 and CC2. Then, according to an embodiment of the present invention, after the CA is performed on CC1 and CC2, the macro base station 110a and the micro base station 120a can jointly transmit data to the UE 130a, so that the service of the UE 130a should not be transmitted between the macro base station 110a and micro base station 120a.

[0097] For example, if UE 130a currently has a radio resource control (Radio Resource Control, RRC) connection with macro base station 110a, during aggregation of CC1 and CC2, CC1 can be used as primary CC (primary CC, PCC), and CC2 can used as secondary CC (secondary CC, SCC). A PCC may be used for mobility management, and an SCC may provide a separation service. Since the macro base station has a large coverage, using the macro base station as a PCC for mobility management can reduce the occurrence of handoffs. If the UE 130a currently has an RRC connection with the micro base station 120a, during the aggregation of CC1 and CC2, CC2 can be used as a PCC, and CC1 can be used as SCC.

[0098] FIG. 1b is a schematic diagram of another example scenario in which an embodiment of the present invention may be applied.

[0099] FIG. 1b may be another LTE-A system scenario. In FIG. 1b, the macro base station 110b may have CC1 whose frequency is f1, and the micro base station 120b may have CC2 whose frequency is f2. CC1 and CC2 have a common coverage area. UE 130b may be located in a common coverage area of CC1 and CC2. Similarly to FIG. 1a, according to an embodiment of the present invention, after the CA is performed on CC1 and CC2, the macro base station 110b and the micro base station 120b can also jointly transmit data to the UE 130b, and service of the UE 130b should not be transmitted between the macro base station 110b and micro base station 120b.

[0100] FIG. 1c is a schematic diagram of another example scenario in which an embodiment of the present invention may be applied.

[0101] FIG. 1c may be another LTE-A system scenario. In FIG. 1c, the micro base station 110c may have CC1 whose frequency is f1, and the micro base station 120c may have CC2 whose frequency is f2. The coverage area of CC2 may be within the coverage area of CC1. UE 130c may be located in the area covered by CC2, that is, located in a common coverage area of CC1 and CC2. Similarly to FIG. 1a, according to an embodiment of the present invention, after the CA is performed on CC1 and CC2, the micro base station 110c and the micro base station 120c can also jointly transmit data to the UE 130c, and service of the UE 130c should not be transmitted between the micro base station 110c and micro base station 120c.

[0102] It should be noted that although FIG. 1c describes a scenario of two micro base stations, an embodiment of the present invention can also be applied to a scenario of two macro base stations, namely, a scenario in which the coverage area of one macro base station may be within the coverage area of another macro base station. Other procedures are similar to those described in FIG. 1c, and are not described repeatedly in this paper to avoid repetition.

[0103] FIG. 1d is a schematic diagram of another example scenario in which an embodiment of the present invention may be applied.

[0104] FIG. 1d may be another LTE-A system scenario. In FIG. 1d, the micro base station 110d may have CC1 whose frequency is f1, and the micro base station 120d may have CC2 whose frequency is f2. CC1 and CC2 have a common coverage area. UE 130d may be located in a common coverage area of CC1 and CC2. Similarly to FIG. 1a, according to an embodiment of the present invention, after the CA is performed on CC1 and CC2, the micro base station 110d and the micro base station 120d can also jointly transmit data to the UE 130d, and service of the UE 130d should not be transmitted between the micro base station 110d and micro base station 120d.

[0105] It should be noted that although FIG. 1d describes a scenario of two micro base stations, an embodiment of the present invention can also be applied to a scenario of two macro base stations, namely, a scenario in which two macro base stations have a common coverage area. Other procedures are similar to those described in FIG. 1d, and are not described repeatedly in this paper to avoid repetition.

[0106] It should be noted that although FIG. 1a - FIG. 1d describe two CCs, an embodiment of the present invention can also be applied to a scenario in which each of two or more base stations has a plurality of CCs and a plurality of CCs have a common coverage area; and multiple CCs of two base stations have different frequencies, or have overlapping frequencies. For example, each of the two base stations provides a carrier whose frequency is f1 and a carrier whose frequency is f2, and carrier f1 and carrier f2 of each of these two base stations have a common coverage area; and the UE may perform CA by aggregating f1 of the first base station and f2 of the second base station, or perform CA by aggregating f2 of the first base station and f1 of the second base station. The case where the UE can perform the CA by aggregating f1 of the first base station and f1 of the second base station may also be referred to as coordinated multipoint (coordinated multipoint, CoMP) transmission / reception (transmission / reception), wherein the first base station and the second base station support communicating with the UE in a coordinated scheduling method that is not limited to an embodiment of the present invention.

[0107] FIG. 2a is a schematic flowchart of a data transmission method according to an embodiment of the present invention. The method of FIG. 2a is performed using the first base station.

[0108] 210a: the first base station generates downlink radio control data units (protocol data units, PDUs) of a radio link control (radio link control, RLC).

[0109] 220a: the first base station sends the first part of the downlink RLC PDUs to the downlink RLC PDUs to the user equipment (user equipment, UE) and sends the second part of the downlink RLC PDUs to the downlink RLC PDUs to the second base station so that the second base station sends the second portion of the downlink RLC PDUs to the UE.

[0110] In an embodiment of the present invention, the first base station may serve as an anchor point (anchor point) of the user plane and be responsible for dividing the downlink signal. For example, the first base station may be one of the macro base station 110a and the micro base station 120a in FIG. 1a, and the second base station may be different. The first base station may also be one of the macro base station 120a and the micro base station 120b in FIG. 1b, and the second base station may be different. The first base station may also be one of the micro base station 110c and the micro base station 120c in FIG. 1c, and the second base station may be different. The first base station may also be one of the micro base station 110d and the micro base station 120d in FIG. 1d, and the second base station may be different. The UE may also be referred to as a mobile terminal (mobile terminal, MT), mobile user equipment, and so on, for example, a mobile phone (or called a “cell phone”) and a computer having a mobile terminal.

[0111] It should be noted that the first base station can serve as an anchor point for the user plane, and its packet data convergence protocol (packet data convergence protocol, PDCP) layer receives from the application layer an Internet Protocol (Internet Protocol, IP) data packet from the serving gateway ( serving gateway, SGW), and uses the IP data packet as a service data unit (service data unit, SDU) PDCP; and after processing at the PDCP layer, PDCP PDUs are generated and forwarded to the RLC layer to serve as RLC SDUs. It should be understood that after generating the downlink RLC PDUs according to the RLC SDUs, the first base station can divide the generated downlink RLC PDUs into a first part of a downlink RLC PDU and a second part of a downlink RLC PDU. In addition, the first base station can also first divide the RLC SDUs into the first part of the RLC SDUs and the second part of the RLC SDUs, and after generating the downlink RLC PDUs, use RLC PDUs that are in the downlink RLC PDUs and correspond to the first part of the RLC SDUs, as the first part of the downlink RLC PDUs, and use the RLC PDUs that are in the downlink RLC PDUs and correspond to the second part of the RLC SDUs, as the second part of the downlink RLC PDUs.

[0112] It should be understood that the first part of the downlink RLC PDUs may include one or more RLC PDUs, and the second part of the downlink RLC PDUs may also include one or more RLC PDUs.

[0113] That the first base station sends the first part of the downlink RLC PDU to the UE may relate to the first base station sends the first part of the downlink RLC PDU to the UE after the first part of the downlink RLC PDU It is processed at various protocol levels. For example, the first base station can send the first part of the downlink RLC PDUs to the UE after the first part of the downlink RLC PDUs is processed at the medium access control (medium access control, MAC) and physical (physical) , PHY) level. Similarly, the second base station sends the second part of the downlink RLC PDU to the UE, may refer to the second base station sends the second part of the downlink RLC PDU to the UE after the second part of the downlink RLC PDU It is processed at various protocol levels. For example, the second base station may send the second part of the downlink RLC PDUs to the UE after the second part of the downlink RLC PDUs is processed at the MAC level and at the PHY level.

[0114] In an embodiment of the present invention, the first base station sends the first part of the downlink RLC PDUs to the downlink RLC PDUs and sends the second part of the downlink RLC PDUs to the second base station to the downlink RLC PDUs, and the second base the station sends the second portion of the downlink RLC PDUs to the UE so that the first base station and the second base station can send data together to the UE, thereby improving the peak speed and throughput of the UE.

[0115] Thus, the service of the UE should not be transferred between two base stations, thus also avoiding the delay or interruption of the service caused by the handover.

[0116] Additionally, as an embodiment, the first base station may receive from the UE the first part of the uplink RLC PDUs in the uplink RLC PDUs generated by the UE, and receive from the second base station the second part of the uplink RLC PDUs in the PDU The uplink RLC, wherein the second part of the uplink RLC PDUs are received by the second base station from the UE.

[0117] It should be understood that the first part of the uplink RLC PDUs may include one or more RLC PDUs, and the second part of the uplink RLC PDUs may also include one or more RLC PDUs.

[0118] In the uplink direction, the first base station may receive a first portion of the uplink RLC PDUs from the UE, and receive from the second base station a second portion of the uplink RLC PDUs sent by the UE to the second base station; and the first base station can reassemble the two parts of the uplink RLC PDUs to generate RLC SDUs and route the RLC SDUs to the PDCP layer in sequence, the RLC SDUs being used as PDCP PDUs and the PDCP PDUs sent to the SGW after sequential processing.

[0119] It should be noted that the first base station receives the first part of the uplink RLC PDUs from the UE, may relate to the fact that the first base station receives the first part of uplink data packets from the UE, and receives the first part of the RLC PDU uplink communication after the first part of the uplink data packets is processed at various protocol layers. For example, the first base station may receive the first part of the uplink RLC PDUs after the first part of the uplink data packets is processed at the PHY and MAC level. The procedure in which the second base station receives the second part of the uplink RLC PDUs from the UE is similar to the case of the first base station, and it is not described again in this paper to avoid repetition.

[0120] Further, as another embodiment, in the acknowledgment mode (acknowledgment mode, AM) of the RLC, the first base station may receive a first RLC status report from the UE. When the first RLC status report indicates RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs, the first base station can retransmit to the ULC RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs. The first base station may send the first RLC status report to the second base station, the first RLC status report may be used to indicate RLC PDUs to be retransmitted in the second part of the downlink RLC PDU, or the first base station may send a retransmission message to a second base station, wherein a retransmission message is generated by the first base station according to the first RLC status report, and the retransmission message may indicate RLC PDUs that should transmitted in the second part of the downlink RLC PDU.

[0121] When the first RLC status report indicates an RLC PDU, which, as confirmed by the UE, is successfully received, the first base station updates the RLC AM transmission window and the corresponding status variable so as to continue sending a new RLC PDU.

[0122] The UE may generate a first RLC status report according to reception situations of a first part of a downlink RLC PDU and a second part of a downlink RLC PDU.

[0123] The first base station may determine, according to the first RLC status report, whether the first part of the downlink RLC PDU and the second part of the downlink RLC PDU have any RLC PDUs to be retransmitted. When the RLC PDUs to be retransmitted exist in the first part of the downlink RLC PDUs, the first base station can retransmit to the RLC PDUs UE to be retransmitted in the first part of the downlink RLC PDUs. When RLC PDUs to be retransmitted exist in the second part of the downlink RLC PDUs, the first base station must notify the second base station of RLC PDUs that must be retransmitted in the second part of the downlink RLC PDUs. For example, the first base station may send the first RLC status report to the second base station, or the first base station may generate a retransmission message according to the first RLC status report, and indicate to the second base station using the retransmission message of the RLC PDUs that should be retransmitted transmitted in the second part of the downlink RLC PDU.

[0124] It should be understood that in embodiments of the present invention, the RLC status report and related retransmission materials of the RLC PDUs can only be applied to AM RLC; and the procedures for generating, sending, and receiving RLC PDUs can be applied to both the AM RLC and the no acknowledgment mode (no acknowledgment mode, UM) of the RLC.

[0125] Further, as another embodiment, in the AM RLC, the first base station may determine the retransmission set of the downlink RLC PDUs according to the first RLC status report, wherein the retransmission set of the downlink RLC PDUs may include RLC PDUs that must be retransmitted in the first part of the downlink RLC PDUs, and / or RLC PDUs, which must be retransmitted in the second part of the downlink RLC PDUs. The first base station can divide the retransmission set of the downlink RLC PDUs into a first subset of the downlink retransmission and a second subset of the downlink retransmission. The first base station may retransmit to the RLC UE PDUs in the first downlink retransmission subset. The first base station may generate a second retransmission message and send a second retransmission message to the second base station, the second retransmission message may indicate a second subset of the downlink retransmission. If one or more RLC PDUs in the second downlink retransmission subset belongs to the original first part of the downlink RLC PDUs, because the first base station is initially responsible for transmitting the first part of the downlink RLC PDUs, and the second base station does not have this part of the RLC PDU, the first base station must additionally send these RLC PDUs to the second base station.

[0126] Thus, the first base station can re-share the RLC PDUs to be retransmitted and determine that part of the RLC PDUs are retransmitted with the first base station and the other part of the RLC PDUs are retransmitted with the second base station. This method can adapt to the real-time radio resource situation of the first base station and the second base station and satisfy the requirement of quality of service (quality of service, QoS) services, and therefore, retransmission efficiency can be improved.

[0127] Additionally, as another embodiment, in the AM RLC, the first base station may receive a first RLC status report from the second base station, wherein the first RLC status report is received by the second base station from the UE. The first base station may determine, according to the first RLC status report, RLC PDUs to be retransmitted in the first part of the downlink RLC PDU. The first base station may retransmit RLC PDUs that are to be retransmitted to the UE in the first part of the downlink RLC PDU.

[0128] When the first RLC status report indicates the RLC PDU, which, as confirmed by the UE, is received successfully, the first base station updates the RLC AM transmission window and the corresponding status variable so as to continue sending the new RLC PDU. Since the UE sends the first RLC status report according to the uplink resource situation, when the first RLC status report is sent through the second base station, the first base station must receive the first RLC status report sent by the second base station.

[0129] In the AM RLC, after generating the first RLC status report, the UE may send the first RLC status report to the second base station, and the second base station sends the first RLC status report to the first base station. The first base station may retransmit to the UE according to the first RLC status report of the RLC PDUs to be retransmitted in the first part of the downlink RLC PDU.

[0130] Further, as another embodiment, in the AM RLC, the first base station may generate a second RLC status report according to reception situations of the first part of the uplink RLC PDUs and the second part of the uplink RLC PDUs and send the second RLC status report to the UE . The first base station may receive RLC PDUs in the uplink retransmission set determined by the UE according to the second RLC status report, wherein the uplink retransmission set may include RLC PDUs to be retransmitted in the first part of the uplink RLC PDU communication lines and / or RLC PDUs to be retransmitted in the second part of the uplink RLC PDU.

[0131] Further, as another embodiment, in the AM RLC, the first base station may generate a second RLC status report according to reception situations of the first part of the uplink RLC PDUs and the second part of the uplink RLC PDUs and send the second RLC status report to the second the base station so that the second base station sends a second RLC status report to the UE. The first base station may receive RLC PDUs in the uplink retransmission set determined by the UE according to the second RLC status report, wherein the uplink retransmission set may include RLC PDUs to be retransmitted in the first part of the uplink RLC PDU communication lines and / or RLC PDUs to be retransmitted in the second part of the uplink RLC PDU.

[0132] When the first base station has a heavy load or poor radio conditions, while the second base station has a light load or good radio conditions, the second base station sends a second RLC status report to the UE so that it is reliable to send a second status report RLC could improve.

[0133] Further, as another embodiment, in an AM RLC, the first base station may receive RLC PDUs in the uplink retransmission set from the UE. Alternatively, the first base station may receive RLC PDUs in the first subset of the uplink retransmission from the UE and receive RLC PDUs in the second subset of the uplink retransmission from the second base station, wherein the second subset of the uplink retransmission is received using the second base station from the UE, and the first uplink retransmission subset and the second uplink retransmission subset are obtained by the UE by dividing the uplink retransmission set yaschey link. Alternatively, the first base station may receive RLC PDUs in the uplink retransmission set from the second base station, wherein RLC PDUs in the uplink retransmission set are received using the second base station from the UE.

[0134] In the AM RLC, the first base station may generate a second RLC status report according to reception situations of the first part of the uplink RLC PDUs and the second part of the uplink RLC PDUs and send a second RLC status report to the UE. The UE may determine, according to the second RLC status report, RLC PDUs to be retransmitted, that is, determine an uplink retransmission set.

[0135] The first base station may receive from the UE all uplink RLC PDUs that are to be retransmitted, that is, the RLC PDUs in the uplink retransmission set. Alternatively, the first base station may receive from the UE a portion of the uplink RLC PDUs to be retransmitted, that is, the RLC PDUs in the first uplink retransmission subset. The second base station may receive from the UE another portion of the uplink RLC PDUs that are to be retransmitted, and then send this portion of the uplink RLC PDUs, that is, the RLC PDUs in the second uplink retransmission subset, to the first base station. Alternatively, the second base station may receive from the UE all the uplink RLC PDUs to be retransmitted, that is, the RLC PDUs in the uplink retransmission set, and then send the RLC PDUs to the first base station.

[0136] Additionally, as another embodiment, the first base station may send the first part of the downlink RLC PDUs to the UE in the first cell of the first base station and send the second part of the downlink RLC PDUs to the second base station so that the second base station sends in the UE in the second cell of the second base station, the second part of the downlink RLC PDUs, wherein the coverage of the first cell and the second cell overlap.

[0137] A first cell exists on the carrier of the first base station, a second cell exists on the carrier of the second base station, and the UE may be located in the coverage area of the first cell and the coverage of the second cell. Therefore, after the CA is performed on the carrier of the first base station and on the carrier of the second base station, the first base station can send the first part of the downlink RLC PDUs to the UE through the first cell, and the second base station can send the second part of the RLC PDUs to the UE downlink through the second cell.

[0138] Further, as another embodiment, the first base station may send a first request message to a second base station, wherein the first request message may be used to instruct the second base station to configure a second cell for the UE. The first base station may receive a first response message from the second base station, wherein the first response message carries resource information of the second cell, such as general radio resource configuration information and specialized radio resource configuration information of the second cell, and resource information of the second cell is determined using the second base station according to the first message of the request. The first base station may send an RRC connection reconfiguration message (RRCConnectionReconfiguration) to the UE, the RRC connection reconfiguration message transferring resource information of the second cell. The first base station may be a macro base station.

[0139] For example, the first base station may determine to add a cell according to the UE measurement report or the measurement result of the uplink sounding reference signal (sounding reference signal, SRS), the UE measurement report may include a received power measurement result a reference signal (received reference signal power, RSRP) of the current serving cell and the neighboring cell. The first base station may also determine that a cell should be added according to other measurement results, such as a channel quality indicator (channel quality indicator, CQI) reported by the UE. Thus, after determining that a cell should be added for the UE to separate data, the first base station can instruct the second base station to configure the second cell of the second base station for the UE. After receiving the resource information of the second cell from the second base station, the first base station can notify using the RRC connection reconfiguration message of the UE about the resource information of the second cell. In this way, the UE can reconfigure the RRC connection according to the resource information of the second cell. In this case, an RRC connection and a radio data channel (data radio channel, DRB) may already exist between the first cell of the first base station and the UE.

[0140] Further, as another embodiment, the first request message may be further used to instruct the second base station to create DRBs for the UE.

[0141] For example, the first base station may determine according to DRB information, such as a QoS parameter, traffic volume, throughput and peak speed, whether or not the second base station should create DRBs for the UE. Thus, the first base station can add DRB configuration information in the first request message, and the second base station can create, according to the DRB configuration information, an RLC object and a logical channel (logical channel, LCH) that correspond to DRBs. For example, DRB configuration information may include at least one of the following: Enhanced Radio Access Channel Identifier (Enhanced Radio Access Channel, E-RAB), Quality of Service (Quality of Service, QoS) E-RAB, DRB Identifier, Configuration Information RLC and logical channel configuration information. In addition, DRB configuration information may also include other relevant information. The quality of service parameter E-RAB may be a QoS parameter after the first base station makes a split decision. For example, the first base station may segment a guaranteed data rate (guaranteed data rate, GBR); if 60% is allocated to the DRB of the first base station and 40% is allocated to the second base station, then the value of the GBR parameter sent to the second base station is 40% times the original value of the GBR parameter. The E-RAB QoS parameter may also be an initial QoS parameter received by the first base station from SGW, and after the first base station and the second base station agree on a split decision, the second base station adjusts the QoS parameter during scheduling. Similarly, the first base station can add configuration information of the signaling radio channel (signaling channel, SRB) in the first request message, and when the first base station is a user plane anchor point, the second base station can create RLC and LCH objects according to the SRB configuration information, which correspond to SRB.

[0142] Further, as another embodiment, the first base station may receive a second request message from the second base station, wherein the second request message may be used to instruct the first base station to configure the first cell for the UE. The first base station may determine, according to the second request message, resource information of the first cell, such as general radio resource configuration information and specialized radio resource configuration information of the first cell. The first base station may send a second response message to the second base station, wherein the second response message carries resource information of the first cell so that the second base station notifies the UE of the resource information of the first cell. The first base station may be a micro base station.

[0143] In particular, the first base station may configure the first cell for the UE according to the command of the second base station. In this case, an RRC and DRB connection may already exist between the second cell of the second base station and the UE. The first base station can configure the resources of the first cell for the UE according to the second request message and can notify the second base station of the resource information of the first cell by using the second response message, and the second base station notifies the UE of the resource information of the first cell so that the UE performs reconfiguring the connection according to resource information of the first cell.

[0144] Additionally, as another embodiment, the second request message may further be used to instruct the first base station to create DRBs for the UE. When the first base station is the user plane anchor point, the first base station can create a packet data convergence protocol object (packet data convergence protocol, PDCP) object, an RLC and LCH object that correspond to DRBs according to the second request message.

[0145] Similarly, the second request message can be further used to instruct the first base station to create an SRB for the UE. The first base station may create, according to the second request message, a PDCP entity, an RLC entity, and a logical channel that correspond to the SRBs.

[0146] In AM RLC, an RLC entity may include a transmitting side and a receiving side; the transmitting side may include at least one of the following functional blocks: a transmission buffer (transmission buffer), a retransmission buffer (retransmission buffer), a segmentation (segmentation) and combining (combining) unit, an RLC PDU header information generation unit (additions RLC header), an RLC control unit (RLC control) used for the automatic retransmission request function (automatic retransmission request, ARQ), and so on, wherein the RLC control unit may include at least one and the following functions: management and maintenance of transmission of the ARQ window, window management and maintenance of receiving the ARQ, the generation of the RLC status report according to the situation of the object receiving the receiving side and the sending of the RLC status report, and the retransmission control of the transmitting side according to the received report on the status of RLC. The receiving side may include at least one of the following functional blocks: a routing (routing) block, a receive buffer (receive buffer), a reordering (reordering) function block, an RLC header information deletion block (RLC header deletion), a reassembly block ( reassembly) SDU and so on; the routing unit includes a function block for distinguishing RLC PDUs from an RLC status report, and so on; the reordering function block is used to reorder RLC PDUs that the MAC layer does not have the ability to forward to the RLC layer, where the lack of order at the MAC layer occurs because the receiving side is not able to receive TB transport blocks in order due to the retransmission of the hybrid automatic retransmission request (hybrid automatic retransmission request, HARQ). The transmitter side may also support re-segmentation (re-segmentation) of the RLC PDUs.

[0147] In the non-acknowledgment mode (non-acknowledgment mode, UM) of the RLC, the RLC entity may be a sending entity or a receiving entity. The sending entity may include at least one of the following functional blocks: a transmission buffer, a segmentation unit, and a combining unit, an RLC PDU header information generation unit, and so on. The reception object may include at least one of the following functional blocks: a reception buffer, a reordering function block, an RLC header information deletion unit, an SDU reassembly unit, and so on.

[0148] Further, as another embodiment, the second request message may be further used to indicate that the first base station is responsible for sharing data. The first base station may send a path switching request message to a mobility management object (mobility management object, MME) according to the second request message, so that the MME requests, according to the SGW path switching request message, to switch the data path to the path from the SGW to the first base station.

[0149] For example, the second base station is a macro base station, the first base station is a micro base station, the macro base station provides wide coverage and mobility management, the micro base station provides coverage and capacity of the access point, and user service data is mainly sent and received using micro base station. In this case, the anchor point can be moved to the micro base station to improve data transfer efficiency.

[0150] The second base station may determine, according to the condition of the communication procedure, which base station will serve as the user plane anchor point, or the second base station and the first base station agree to determine which base station will serve as the user plane anchor point. For example, the second base station may determine a user plane anchor point according to a split decision or split ratio. If the first base station uses a larger split ratio, for example, 30% of the GBRs are allocated to the second base station, and 70% of the GBRs are allocated to the first base station, then the second base station can determine the first base station as the user plane anchor point. If the second base station previously served as an anchor point of the user plane, then the movement of the anchor point, or called path switching (path switching), should be performed in this case to move the corresponding E-RAB to the interface between the first base station and the SGW. The first base station may send a path switching request message to the MME, and the MME sends a channel change request message to the SGW, thereby completing the switching of the data path. Thus, by moving the anchor point, the separation efficiency can be improved, and the delay can be reduced.

[0151] For example, the second base station is a macro base station, the first base station is a micro base station, the UE has good radio conditions in the micro base station, and the micro base station has a small load, so the micro base station may have a larger user service ratio ; in this case, the anchor point can be moved to the micro base station to improve data transfer efficiency.

[0152] It should be noted that in the downlink direction, the data volumes of the first part of the downlink RLC PDU and the second part of the downlink RLC PDU can be statically configured and can also be dynamically adjusted. In the uplink direction, the data volumes of the first part of the uplink RLC PDUs and the second part of the uplink RLC PDUs can also be statically configured or dynamically adjusted.

[0153] For example, before dividing the data, the first base station may send a capacity allocation request message to the second base station to request the second base station to prepare or reserve radio resources to send the second part of the downlink RLC PDUs or to receive the second part of the uplink RLC PDUs. The second base station may reserve radio resources for the second part of the downlink RLC PDUs or the second part of the uplink RLC PDUs in response to a capacity allocation request message from the first base station. Alternatively, the second base station may actively send a capacity allocation indication message to the first base station, wherein the capacity allocation indication message may indicate capacity or reserved buffer information of the second base station so that the first base station sends a second portion of the downlink RLC PDU corresponding to capacity or a buffer, or the first base station learns from the message indicating the distribution of capacity information about radio resources that the second base station can predelyat for the UE to send the second part of the PDU RLC uplink.

[0154] Furthermore, the second base station may further send a capacity correction indication message to the first base station according to a situation of being able to schedule and / or change a buffer of the second base station, and notify the first base station of the capacity reduction information by using the capacity correction indication message. or about increasing capacity.

[0155] FIG. 2b is a schematic flowchart of a data transmission method according to an embodiment of the present invention. The method of FIG. 2b is performed using the first base station.

[0156] 210b: the first base station receives from the UE the first part of the uplink RLC PDUs in the uplink RLC PDUs generated by the UE, and receives from the second base station the second part of the uplink RLC PDUs in the uplink RLC PDU, wherein the second part of the uplink RLC PDU is received by the second base station from the UE.

[0157] Further, as an embodiment, after receiving the first part of the uplink RLC PDU and the second part of the uplink RLC PDU, the first base station can reassemble the first part of the uplink RLC PDU and the second part of the uplink RLC PDU.

[0158] Further, as another embodiment, the first base station may generate a second RLC status report according to reception situations of the first part of the uplink RLC PDUs and the second part of the uplink RLC PDUs and send a second RLC status report to the UE. The first base station may receive RLC PDUs in the uplink retransmission set determined by the UE according to the second RLC status report, wherein the uplink retransmission set includes RLC PDUs to be retransmitted in the first part of the uplink RLC PDU communications, and / or RLC PDUs to be retransmitted in the second part of the uplink RLC PDU.

[0159] Additionally, as another embodiment, the first base station may receive RLC PDUs in the uplink retransmission set from the UE. Alternatively, the first base station may receive RLC PDUs in the first subset of the uplink retransmission from the UE and receive RLC PDUs in the second subset of the uplink retransmission from the second base station, wherein the RLC PDUs in the second subset of the uplink retransmission are received using a second base station from the UE, and the first uplink retransmission subset and the second uplink retransmission subset are obtained by the UE by dividing the retransmission set and uplink. Alternatively, the first base station may receive RLC PDUs in the uplink retransmission set from the second base station, wherein RLC PDUs in the uplink retransmission set are received using the second base station from the UE.

[0160] In an embodiment of the present invention, the first base station receives from the UE the first part of the uplink RLC PDUs in the uplink RLC PDUs generated by the UE, and receives from the second base station the second part of the uplink RLC PDUs in the uplink RLC PDU communication lines so that the first base station and the second base station have the ability to combine data transmission to the UE, thereby improving the peak speed and throughput of the UE.

[0161] Thus, service of the UE should not be transferred between two base stations, whereby delays or interruptions of service caused by handover are also avoided.

[0162] FIG. 3 is a schematic flowchart of a data transmission method according to an embodiment of the present invention. The method of FIG. 3 is performed using a second base station.

[0163] 310: the second base station receives from the first base station a second portion of the downlink RLC PDUs in the downlink RLC PDUs generated by the first base station.

[0164] 320: the second base station sends the second portion of the downlink RLC PDUs to the UE.

[0165] The first base station may be an anchor point of a user plane responsible for sharing data. The first base station may send the first part of the downlink RLC PDUs to the UE in the downlink RLC PDUs and send the second part of the downlink RLC PDUs to the second base station. The second base station sends the second part of the downlink RLC PDU to the UE. For example, the first base station may be one of the macro base station 110a and the micro base station 120a in FIG. 1a, and the second base station may be different. The first base station may also be one of the macro base station 110b and the micro base station 120b in FIG. 1b, and the second base station may be different.

[0166] In an embodiment of the present invention, the second base station sends the second portion of the downlink RLC PDUs to the UE to the downlink RLC PDUs generated by the first base station, thereby improving the peak speed and throughput of the UE.

[0167] Further, as another embodiment, the second base station may receive from the UE the second portion of the uplink RLC PDUs in the uplink RLC PDUs generated by the UE. The second base station may send the second part of the uplink RLC PDUs to the first base station.

[0168] That the second base station receives the second part of the uplink RLC PDUs from the UE may relate to the fact that the second base station receives the second part of uplink data packets from the UE and receives the second part of the uplink RLC PDU after how the second part of the uplink data packets will undergo processing at various protocol layers. For example, the second base station may receive the second part of the uplink RLC PDUs after the second part of the uplink data packets is processed at the PHY and MAC level.

[0169] Further, as another embodiment, in the AM RLC, the second base station may receive the first RLC status report from the first base station, determine according to the first RLC status report the RLC PDUs to be retransmitted in the second part of the downlink RLC PDU , and retransmit to the RLC PDUs UE, which are to be retransmitted in the second part of the downlink RLC PDUs. Alternatively, the second base station may receive a retransmission message from the first base station and retransmit to the UE according to the retransmission message of the RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs, the retransmission message indicating the RLC PDUs to retransmit transmitted in the second part of the downlink RLC PDU.

[0170] In particular, in the AM RLC, the second base station may retransmit to the UE according to the first RLC status report sent by the first base station or a retransmission message generated by the first base station according to the first RLC status report, PDU RLCs to be retransmitted in the second part of the downlink RLC PDU.

[0171] Further, as another embodiment, in the AM RLC, the second base station may receive a second retransmission message from the first base station, the second retransmission message may indicate a second subset of the downlink retransmission. The second base station may retransmit to the UE according to the second RLC PDU retransmission message in the second downlink retransmission subset.

[0172] The first base station may determine the retransmission set of the downlink RLC PDUs according to the first RLC status report, wherein the retransmission set of the downlink RLC PDUs may include RLC PDUs to be retransmitted in the first part of the downlink RLC PDU communications, and / or RLC PDUs to be retransmitted in the second part of the downlink RLC PDU. The first base station can divide the retransmission set of the downlink RLC PDUs into a first subset of the downlink retransmission and a second subset of the downlink retransmission. The first base station can retransmit RLC PDUs in the first downlink retransmission subset to the UE and notify the second base station of the RLC PDUs using the second retransmission message, for which the second base station should be responsible for retransmission. If one or more RLC PDUs in the second downlink retransmission subset belongs to the original first part of the downlink RLC PDUs, because the first base station is initially responsible for transmitting the first part of the downlink RLC PDUs, and the second base station does not have this part of the RLC PDU, the second base station must additionally receive these RLC PDUs from the first base station.

[0173] This method can adapt to the real-time radio resource situation of the first base station and the second base station and satisfy the quality of service (quality of service, QoS) service requirements, and therefore, retransmission efficiency can be improved.

[0174] Further, as another embodiment, in the RLC AM, the second base station may receive a first RLC status report from the UE. The second base station may send the first RLC status report to the first base station so that when the first RLC status report indicates RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs, the first base station retransmits the RLC PDUs to the UE, to be retransmitted in the first part of the downlink RLC PDU. When the first RLC status report indicates RLC PDUs that are to be retransmitted in the second part of the downlink RLC PDUs, the second base station can retransmit to the ULC RLC PDUs that are to be retransmitted in the second part of the downlink RLC PDUs.

[0175] Furthermore, the second base station may send the first RLC status report to the first base station so that when the first base station determines according to the first RLC status report which RLC PDUs to be retransmitted exist in the first part of the PDU Downlink RLC, the first base station retransmits to the ULC RLC PDUs that are to be retransmitted in the first part of the downlink RLC PDU.

[0176] Further, as another embodiment, in the AM RLC, the second base station may receive RLC PDUs in the uplink retransmission set from the UE and send RLC PDUs in the uplink retransmission set to the first base station, wherein the uplink retransmission set the communication line may include RLC PDUs that are to be retransmitted in the first part of the uplink RLC PDUs and / or RLC PDUs that are to be retransmitted in the second part of the uplink RLC PDUs. Alternatively, the second base station may receive RLC PDUs in the second subset of the uplink retransmission from the UE and send RLC PDUs in the second subset of the uplink retransmission to the first base station, wherein the second subset of the uplink retransmission is obtained by the UE using dividing the uplink retransmission set.

[0177] In the AM RLC in the uplink direction, the UE can retransmit to the second base station all uplink RLC PDUs that are to be retransmitted, and the second base station sends these uplink RLC PDUs to the first base station that must be retransmitted be transmitted. The UE may also divide the uplink RLC PDUs to be retransmitted into two parts, one part being retransmitted to the first base station and the other part being retransmitted to the second base station; the second base station sends the received portion of the RLC PDUs to the first base station.

[0178] Further, as another embodiment, the second base station may send a second portion of the downlink RLC PDU to the UE in the second cell of the second base station.

[0179] Further, as another embodiment, the second base station may receive a first request message from the first base station, wherein the first request message can be used to instruct the second base station to configure the second cell for the UE. The second base station may determine the resource information of the second cell according to the first request message. The second base station may send the first response message to the first base station, wherein the first response message carries resource information of the second cell, so that the first base station notifies the UE of the resource information of the second cell.

[0180] Further, as another embodiment, the first request message may be further used to instruct the second base station to create DRBs for the UE. The second base station may create, according to the first request message, an RLC entity and a logical channel that correspond to DRBs.

[0181] The second base station does not serve as an anchor point for the user plane, and therefore, the PDCP entity cannot be created. Alternatively, the second base station may create a PDCP entity, and because the function of the PDCP entity is not necessary, the PDCP entity may be turned off after creation.

[0182] In AM RLC, an RLC entity may include a transmitting side and a receiving side; the transmitting side may include at least one of the following functional blocks: a transmission buffer and a retransmission buffer; and further, the transmitting side includes a segmentation unit and an RLC PDU header information generating unit, and can only support the function of re-segmenting the RLC PDUs and generating RLC header information due to repeated segmentation; a transmission buffer is used to receive RLC PDUs sent by the first base station; the retransmission buffer is used to store RLC PDUs that may possibly be retransmitted, for example, after sending to the UE for the first time, the RLC PDU in the transmission buffer is moved to the retransmission buffer. Further, the transmitting side includes an RLC control unit, wherein the RLC control unit controls retransmission of the RLC PDUs of the second base station according to the RLC status report from the first base station; the RLC control unit controls the retransmission of the RLC PDUs of the second base station according to the RLC status report from the UE and sends an RLC completion status report to the second base station; and the RLC control unit itself does not generate an RLC status report and does not need to support a transmission window or an ARQ reception window. The transmitting side may also include only a transmission buffer that is used to receive RLC PDUs sent by the first base station and send the RLC PDUs to the UE; the second base station should not support retransmission of RLC PDUs; or the first base station retransmits the RLC PDU, which is to be retransmitted, like a new RLC PDU to the transmission buffer of the second base station, so that the RLC PDU is directed by the second base station to the UE. The receiving side may include at least one of the following functional blocks: a receiving buffer; further, the receiving side includes a reordering function block; further, the receiving side includes a routing functional unit; further, the receiving side includes an SDU reassembly unit, but the SDU reassembly unit is set to an off state.

[0183] In an UM RLC, an RLC entity may be a send entity or a receive entity. A sending entity may include at least one of the following functional blocks: a transmission buffer; further, the sending entity further includes a segmentation unit and an RLC PDU header information generating unit, and can only support the function of re-segmenting the RLC PDUs and generating RLC header information due to the repeated segmentation. The receive object may include at least one of the following functional blocks: a receive buffer; further, the receiving entity includes a reordering function block; further, the receiving entity includes an SDU reassembly unit, but the SDU reassembly unit is set to an off state.

[0184] Further, as another embodiment, the second base station may send a second request message to the first base station, wherein the second request message can be used to instruct the first base station to configure the first cell of the first base station for the UE. The second base station receives a second response message from the first base station, wherein the second response message carries resource information of the first cell, and resource information of the first cell is determined using the first base station according to the second request message. The second base station sends an RRC connection reconfiguration message to the UE, wherein the RRC connection reconfiguration message carries resource information of the first cell.

[0185] Further, as another embodiment, the second request message may be further used to instruct the first base station to create DRBs for the UE.

[0186] FIG. 4 is a schematic flowchart of a data transmission method according to an embodiment of the present invention. The method of FIG. 4 is performed by a UE, which, for example, may be a UE 130a in FIG. 1a or UE 130b in FIG. 1b.

[0187] 410: the UE receives from the first base station a first part of a downlink RLC PDUs in the RLC PDUs generated by the first base station, and receives from a second base station a second part of a downlink RLC PDUs in a downlink RLC PDU, wherein the second part of the downlink RLC PDU is received by the second base station from the first base station.

[0188] In an embodiment of the present invention, the UE receives from the first base station a first portion of a downlink RLC PDU in a downlink RLC PDU and receives from a second base station a second portion of a downlink RLC PDU that are obtained by a second base station from the first the base station, so that the UE is able to transmit data to these two base stations together, thereby improving the peak speed and throughput of the UE.

[0189] Thus, the service of the UE located in the common coverage area of these two base stations should not be transferred between the two base stations, thus also avoiding the delay or interruption of the service caused by the handover.

[0190] Additionally, as an embodiment, the UE may reassemble the first part of the downlink RLC PDUs and the second part of the downlink RLC PDUs to form the downlink RLC SDUs.

[0191] Additionally, as another embodiment, the UE may generate uplink RLC PDUs. The UE may send the first part of the uplink RLC PDUs in the uplink RLC PDUs to the first base station and send the second part of the uplink RLC PDUs in the uplink RLC PDUs to the second base station.

[0192] PDCP layer. The UE may receive IP data packets from the application layer and use the IP data packets as PDCP SDUs; after processing at the PDCP level, PDCP PDUs are generated and forwarded to the RLC level; and the RLC layer uses PDCP PDUs as the RLC SDUs and generates uplink RLC PDUs from the RLC SDUs.

[0193] In the uplink direction, the UE can send part of the RLC PDU to the first base station and send another part of the RLC PDU to the second base station, and the second base station sends this part of the RLC PDU to the first base station, thereby improving peak speed and throughput UE ability.

[0194] It should be noted that the UE sends the first part of the uplink RLC PDU to the first base station, may relate to the UE sending the first part of the uplink RLC PDU to the first base station after the first part of the RLC PDU the uplink is processed at various protocol layers, for example, the UE can send the first part of the uplink RLC PDUs to the first base station after the first part of the uplink RLC PDUs is processed at the MAC level and at the PHY level. The procedure in which the UE sends the second part of the uplink RLC PDU to the second base station is similar and is not described again in this paper to avoid repetition.

[0195] Further, as another embodiment, the UE generates a first RLC status report according to reception situations of a first part of a downlink RLC PDU and a second part of a downlink RLC PDU, wherein the first RLC status report indicates RLC PDUs to be retransmitted in a first part of a downlink RLC PDU, and / or RLC PDUs to be retransmitted in a second part of a downlink RLC PDU. The UE may send the first RLC status report to the first base station or to the second base station. The UE may receive RLC PDUs that must be retransmitted in the first part of the downlink RLC PDUs from the first base station and / or receive RLC PDUs that must be retransmitted in the second part of the downlink RLC PDUs from the second base station.

[0196] In AM RLC, the UE may generate a first RLC status report according to reception situations of a first part of a downlink RLC PDU and a second part of a downlink RLC PDU. The UE may send the first RLC status report to the first base station and may also send the first RLC status report to the second base station. If the RLC PDUs to be retransmitted exist in the first part of the downlink RLC PDUs, then the UE may receive the RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs from the first base station. If the RLC PDUs to be retransmitted exist in the second part of the downlink RLC PDUs, then the UE may receive the RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs from the second base station.

[0197] It should be noted that the UE may also divide the first RLC status report into two segments according to the uplink resource situation and send two segments of the first RLC status report to the first base station and the second base station at the same time; the second base station sends to the first base station a segment of the first RLC status report received by the second base station.

[0198] Further, as another embodiment, in the AM RLC, the UE generates a first RLC status report according to reception situations of the first part of the downlink RLC PDU and the second part of the downlink RLC PDU and sends the first RLC status report to the first base station. The UE may receive RLC PDUs in the first subset of the downlink retransmission from the first base station and receive RLC PDUs in the second subset of the downlink retransmission from the second base station, the first subset of the downlink retransmission and the second subset of the downlink retransmission obtained by the first base station by dividing the retransmission set of the downlink RLC PDUs, the retransmission set of the downlink RLC PDUs can be determined using the first base station according to the first RLC status report, and the retransmission set of the downlink RLC PDUs may include RLC PDUs that are to be retransmitted in the first part of the downlink RLC PDUs and / or RLC PDUs that are to be retransmitted to the second part of the downlink RLC PDUs received from the second base station.

[0199] Additionally, as another embodiment, in the RLC AM, the UE may receive a second RLC status report from the first base station. The UE may determine the uplink retransmission set according to the second RLC status report, wherein the uplink retransmission set includes RLC PDUs that are to be retransmitted in the first part of the uplink RLC PDUs and / or RLC PDUs that should retransmitted in the second part of the uplink RLC PDU. The UE sends the RLC PDUs in the uplink retransmission set to the first base station or sends the RLC PDUs in the uplink retransmission set to the second base station, or sends the RLC PDUs in the first uplink retransmission subset to the first base station and sends the PDU An RLC in a second subset of the uplink retransmission to the second base station, wherein the first subset of the uplink retransmission and the second subset of the uplink retransmission are obtained by the UE by dividing the uplink retransmission set.

[0200] In AM RLC, the UE may determine, according to the second RLC status report, RLC PDUs to be retransmitted, that is, an uplink retransmission set. The UE may determine, according to an uplink grant, how to retransmit RLC PDUs to be retransmitted. The UE may retransmit all RLC PDUs to be retransmitted to the first base station, and may also retransmit all RLC PDUs to be retransmitted to the second base station. Alternatively, the UE may divide the RLC PDUs to be retransmitted into two parts, i.e., a first uplink retransmission subset and a second uplink retransmission subset, and retransmit the RLC PDUs in these two subsets to the first base station and to the second base station, respectively.

[0201] In the AM RLC according to the second RLC status report, when the second RLC status report indicates the RLC PDU, which, as confirmed by the first base station, is successfully received, the UE can update the transmission window of the AM RLC and the corresponding state variable so that keep sending new RLC PDUs.

[0202] Further, as another embodiment, the UE receives the first part of the downlink RLC PDUs from the first cell of the first base station, and receives the second part of the downlink RLC PDUs from the second cell of the second base station, wherein the first cell and the second cell are located on different carriers.

[0203] After the CA is performed on the carrier of the first base station and the carrier of the second base station, the UE can transmit data through the first cell on the carrier of the first base station and through the second cell on the carrier of the second base station.

[0204] Additionally, as another embodiment, the UE may receive an RRC connection reconfiguration message from the first base station, wherein the RRC connection reconfiguration message carries resource information of the second cell, and resource information of the second cell is determined using the second base station.

[0205] It should be understood that the UE may also receive an RRC connection reconfiguration message from the second base station, wherein the RRC connection reconfiguration message carries resource information of the second cell, and resource information of the second cell is determined using the second base station.

[0206] Further, as another embodiment, the UE may receive an RRC connection reconfiguration message from a second base station, wherein the RRC connection reconfiguration message carries resource information of the first cell, and resource information of the first cell is determined using the first base station.

[0207] It should be understood that the UE may also receive an RRC connection reconfiguration message from the first base station, wherein the RRC connection reconfiguration message carries resource information of the first cell, and resource information of the first cell is determined using the first base station.

[0208] The following describes in detail an embodiment of the present invention with reference to specific examples; it should be noted that these examples are simply provided in order to help one skilled in the art understand the embodiment of the present invention better, but are not intended to limit the scope of the embodiment of the present invention.

[0209] FIG. 5 is a schematic diagram of a data transmission procedure according to an embodiment of the present invention.

[0210] In FIG. 5, the first base station, which is a macro base station, and the second base station, which is a micro base station, are used as an example for description. For example, the first base station may be a macro base station 110a in FIG. 1a or macro base station 110b in FIG. 1b, and the second base station may be the micro base station 120a in FIG. 1a or micro base station 120b in FIG. 1b. The UE may be UE 130a in FIG. 1a and may also be UE 130b in FIG. 1b.

[0211] In FIG. 5 macro base station serves as a reference point for the user plane. A macro base station can receive a downlink signal delivered by a packet data gateway (packet data gateway, PGW) via an S1-U interface and from SGW, and separate the downlink signal, with one part being sent to the UE via the Uu interface, and another part is sent to the UE using the micro base station. The macro base station may also receive uplink data from the UE via the Uu interface, receive uplink data sent by the UE from the micro base station to the micro base station, and send two pieces of uplink data to the SGW via the S1-U interface after processing two pieces of uplink data; two pieces of uplink data after processing are sent by SGW to PGW.

[0212] The following describes in detail the data splitting configuration procedure in FIG. 5 with reference to FIG. 6.

[0213] FIG. 6 is a schematic flowchart of a data sharing configuration procedure according to an embodiment of the present invention.

[0214] It is assumed that the UE has created an RRC connection with the macro base station, and the macro base station cell currently serves the UE. The macro base station may complete the data sharing configuration procedure with the micro base station by transmitting data to the UE. The following describes this procedure in detail.

[0215] 601: The UE sends a measurement report to the macro base station.

[0216] For example, the UE may generate a measurement report based on a cell-specific reference signal (cell-specific reference signal, CRS) or on a channel state information reference signal (channel state information reference signal, CSI-RS). The measurement report may include an RSRP measurement result of the cell of the macro base station and the neighboring cell.

[0217] 602: the macro base station determines according to the measurement report that a cell of the micro base station should be added and / or a DRB created.

[0218] Adding a second cell may relate to cell aggregation of the micro base station for the UE. The creation of a DRB may relate to the fact that the micro base station creates a DRB for the UE.

[0219] In addition, the macro base station may also determine according to the measurement result of the macro base station SRS that a cell of the micro base station should be added, and may also determine according to other measurement results, such as the CQI reported by the UE, that the cell should be added micro base station.

[0220] In addition, the macro base station may also determine according to the DRB information, such as the QoS parameter, the amount of traffic, throughput, and peak speed that the DRB should be created.

[0221] It should be noted that there is no specific sequence for performing the procedure in which the macro base station determines that the cell of the micro base station should be added, and the procedure in which the macro base station determines that the DRB should be created, and these two procedures can also run simultaneously. For example, a macro base station may simultaneously determine that a second cell should be added and / or create a DRB, and may also first determine that a cell of a micro base station should be added, and then determine that a DRB should be created, or first determine what should be created. DRB, and then determine that a cell of the micro base station should be added, which is not limited in the embodiment of the present invention.

[0222] 603: the macro base station sends the first request message to the micro base station.

[0223] The first request message may instruct the micro base station to configure the micro base station cell for the UE. The first request message may further instruct the micro base station to create a DRB for the UE.

[0224] According to the above step 602, the macro base station may instruct the micro base station in the first request message to configure the micro base station cell and create the DRB, and may also send the first request message to the micro base station twice to individually instruct the micro base a station to configure a cell of a micro base station and create a DRB.

[0225] When the first request message instructs the micro base station to create a DRB for the UE, the macro base station can add DRB configuration information in the first request message. For example, DRB configuration information may include at least one of the following: enhanced radio access channel identifier (enhanced radio access channel, E-RAB), E-RAB QoS parameter, DRB identifier, RLC configuration information, and logical channel configuration information . In addition, DRB configuration information may also include other relevant information. The quality of service parameter E-RAB may be a QoS parameter after the macro base station makes a split decision. For example, a micro base station can segment a guaranteed data rate (guaranteed data rate, GBR); if 60% are distributed by the macro base station DRB and 40% are allocated by the micro base station, then the value of the GBR parameter sent to the micro base station is 40% times the original value of the GBR parameter.

[0226] 604: the micro base station configures the cell of the micro base station and creates a DRB for the UE according to the first request message.

[0227] The micro base station may perform acknowledgment control according to the first request message, and configure cell resources of the micro base station to determine resource information of the micro base station cell.

[0228] If the first request message indicates the creation of a DRB for the UE, then the micro base station can create according to the DRB configuration information that is carried in the first request message, an RLC object and a logical channel that correspond to DRB, and creates DRB parameters, RLC parameter, logical channel parameter, QoS parameter, and so on. The QoS parameter can be configured according to the split ratio that is carried in the first request message.

[0229] It should be noted that the micro base station may not create a PDCP entity. Alternatively, the micro base station may create a PDCP entity and turn off the PDCP entity.

[0230] It should be further noted that the micro base station configures the cell of the micro base station and the micro base station creates DRBs are two procedures, and their execution sequence is not determined. However, to implement the above data separation procedure, both procedures must be completed.

[0231] 605: the micro base station sends the first response message to the macro base station.

[0232] The first response message may carry resource information of the micro base station cell.

[0233] 606: the macro base station sends an RRC connection reconfiguration message to the UE.

[0234] An RRC connection reconfiguration message may carry resource information of a micro base station cell.

[0235] In general, the above DRB configuration may be used as the DRB configuration of the UE. If the DRB of the UE is to be reconfigured, then the macro base station may add DRB configuration information in the RRC connection reconfiguration message.

[0236] 607: The UE performs a reconfiguration of the connection according to the RRC connection reconfiguration message.

[0237] The UE may configure the associated radio resources of the micro base station cell according to the resource information of the micro base station cell, which is carried in the RRC connection reconfiguration message.

[0238] If the RRC connection reconfiguration message further carries DRB configuration information, then the UE may further reconfigure DRB according to the DRB configuration information.

[0239] 608: The UE sends an RRC connection re-establishment completion message to the macro base station.

[0240] After the reconfiguration is completed successfully, the UE notifies the macro base station that the reconfiguration is completed.

[0241] 609: the macro base station sends a configuration completion message to the micro base station.

[0242] The macro base station notifies, using the configuration completion message, the micro base station that the UE is completing reconfiguration of the connection.

[0243] 610: The UE performs a random access procedure to the micro base station to complete uplink synchronization with the micro base station.

[0244] It should be noted that step 610 may also be performed between step 607 and step 608. If the UE completes uplink synchronization with the micro base station after step 608, then at step 608, the UE may also send an RRC connection reconfiguration completion message to the micro base station, and the micro base station sends an RRC connection reconfiguration completion message to the macro base station. The UE may notify the macro base station after the random access of the micro base station is completed successfully, so that the macro base station starts data distribution of the micro base station.

[0245] 611: a macro base station transmits data to a UE, and transmits data to a UE through a micro base station.

[0246] In the downlink direction, the macro base station may receive the downlink signal from the SGW and generate the downlink RLC PDU according to the downlink signal.

[0247] A macro base station can send the first part of the downlink RLC PDUs to the downlink RLC PDUs and send the second part of the downlink RLC PDUs to the micro base station to the downlink RLC PDU. The micro base station may send the second part of the downlink RLC PDUs to the UE.

[0248] In the uplink direction, the UE can generate uplink RLC PDUs, send the first part of the uplink RLC PDUs in the uplink RLC PDUs to the macro base station, and send the second part of the uplink RLC PDUs in the uplink RLC PDU to the micro base station. The micro base station sends the second part of the uplink RLC PDUs to the macro base station. The macro base station sends two parts of the uplink RLC PDUs to the SGW after reassembling and performing another processing of the two parts of the uplink RLC PDUs.

[0249] It should be understood that the sequence numbers of the above procedures do not indicate the sequence of execution. The sequence of procedures should be determined according to the functions and their internal logic, and should not constitute a limitation on the procedure for implementing the embodiment of the present invention.

[0250] In an embodiment of the present invention, the macro base station serves as an anchor point of the user plane, so that the macro base station and the micro base station have the ability to combine data transmission to the UE, thereby improving the peak speed and throughput of the UE.

[0251] In addition, UE service should not be transferred between the macro base station and the micro base station, thus also avoiding the delay or interruption of service caused by the handover.

[0252] In the above FIG. 5 and FIG. 6 macro base station serves as the anchor point of the user plane; in an embodiment of the present invention, the micro base station may also serve as a user plane anchor point. The following provides descriptions with reference to FIG. 7 and FIG. 8.

[0253] FIG. 7 is a schematic diagram of a data transmission procedure according to an embodiment of the present invention.

[0254] In FIG. 7, a first base station, which is a micro base station, and a second base station, which is a macro base station, are used as an example for description. For example, the first base station may be the micro base station 120a in FIG. 1a or micro base station 120b in FIG. 1b, and the second base station may be a macro base station 110a in FIG. 1a or macro base station 110b in FIG. 1b. The UE may be UE 130a in FIG. 1a or UE 130b in FIG. 1b.

[0255] In FIG. 7, the micro base station serves as a reference point for the user plane. The micro base station can receive the downlink signal delivered by the PGW through the S1-U interface and from the SGW, and separate the downlink signal, with one part being sent to the UE via the Uu interface and the other part being sent to the UE by the macro base station. The micro base station can also receive uplink data from the UE via the Uu interface, receive uplink data sent by the UE from the macro base station to the macro base station, and send two pieces of uplink data to the SGW via the S1-U interface after processing two pieces of uplink data; two pieces of uplink data after processing sends the SGW to the PGW.

[0256] The following describes in detail the data splitting configuration procedure in FIG. 7 with reference to FIG. 8.

[0257] FIG. 8 is a schematic flowchart of a data sharing configuration procedure according to an embodiment of the present invention.

[0258] It is assumed that the UE creates an RRC connection with the macro base station, and the macro base station cell currently serves the UE. The macro base station may complete the data sharing configuration procedure with the micro base station by transmitting data to the UE. The following describes this procedure in detail.

[0259] Step 801 is similar to step 601 in FIG. 6 and it is not described repeatedly in this paper in order to avoid repetition.

[0260] 802: the macro base station determines according to the measurement report that a cell of the micro base station should be added and / or a DRB is created, and determines that the anchor point should be moved.

[0261] The procedure in which the macro base station determines that a cell of the micro base station should be added and a DRB is created is similar to step 602 in FIG. 6, and is not described repeatedly in this paper to avoid repetition.

[0262] A macro base station may determine, based on relevant information, such as a measurement report and according to a separation policy or split ratio, a micro base station as an anchor point. For example, if the micro base station uses a larger separation ratio, for example, 30% of the GBR are allocated to the macro base station, and 70% of the GBR are allocated to the micro base station, then the macro base station can determine that the anchor point should be moved so that the micro base station served as the anchor point of the user plane, that is, perform a path switch, and the corresponding E-RAB moves to the S1-U interface between the micro base station and the SGW.

[0263] Furthermore, in the case where a plurality of DRBs are partitioned, the partition ratios of these DRBs can be kept consistent with the partitioning policy as much as possible, for example, in the case where two DRBs are partitioned, it can be determined for both DRBs in a partitioning policy that micro the base station uses a larger split ratio, and macro the base station uses a lower split ratio.

[0264] 803: the macro base station sends a second request message to the micro base station.

[0265] The second request message may instruct the micro base station to configure the micro base station cell for the UE. The second request message may further instruct the micro base station to create DRBs for the UE.

[0266] In addition, the second request message may further instruct the micro base station to serve as a user plane anchor point.

[0267] The procedure of step 803 is similar to the procedure of step 603 in FIG. 6, and it is not described repeatedly in this paper in order to avoid repetition.

[0268] 804: According to the second request message, the micro base station configures the micro base station cell, creates a DRB for the UE, and prepares to move the anchor point.

[0269] The procedure in which the micro base station configures the micro base station cell for the UE is similar to the procedure in step 604 of FIG. 6, and is not described repeatedly in this paper to avoid repetition.

[0270] If the second request message indicates the creation of a DRB for the UE, then the micro base station can create according to the DRB configuration information carried in the second request message, a PDCP entity, an RLC entity and a logical channel that correspond to DRB, and sets the DRB parameter, PDCP parameter, RLC parameter, logical channel parameter, QoS parameter, and so on. The QoS parameter may be configured according to the split ratio that is carried in the second request message.

[0271] Step 804 differs from step 604 in that the micro base station must prepare to move the anchor point.

[0272] 805: the micro base station sends a second response message to the macro base station.

[0273] The second response message may carry resource information of the micro base station cell. The second response message may further instruct the micro base station to prepare to move the anchor point.

[0274] 806: the macro base station sends an RRC connection reconfiguration message to the UE.

[0275] An RRC connection reconfiguration message may carry resource information of a micro base station cell.

[0276] In general, the above DRB configuration may be used as the DRB configuration of the UE. If the DRB of the UE is to be reconfigured, then the macro base station may add DRB configuration information in the RRC connection reconfiguration message.

[0277] 807: The UE performs an RRC connection reconfiguration according to an RRC connection reconfiguration message.

[0278] The UE may configure the associated radio resources of the micro base station cell according to the resource information of the micro base station cell, which is carried in the RRC connection reconfiguration message.

[0279] If the RRC connection reconfiguration message further carries DRB configuration information, then the UE may further reconfigure the DRB according to the DRB configuration information.

[0280] 808: The UE sends an RRC connection reconfiguration completion message to the macro base station.

[0281] After the reconfiguration is completed successfully, the UE notifies the macro base station that the reconfiguration is completed.

[0282] 809: the macro base station sends a configuration completion message to the micro base station.

[0283] The macro base station notifies, using the configuration completion message, the micro base station that the UE is completing reconfiguration of the connection.

[0284] 810: the micro base station sends a path switching request message to the MME.

[0285] The path switching request message may indicate a data path switching for the micro base station.

[0286] 811: The MME sends a channel change request message to the SGW.

[0287] The channel change request message may request the SGW to switch the data path.

[0288] 812: The SGW switches the path according to the channel change request message.

[0289] 813: The SGW sends a channel change response message to the MME.

[0290] 814: The MME sends a path switching response message to the micro base station.

[0291] 815: The UE performs a random access procedure to the micro base station to complete uplink synchronization with the micro base station.

[0292] It should be noted that step 815 may be performed in parallel with the path switching procedure of steps 810 to 814.

[0293] Before step 815, the macro base station can continue the data transmission procedure to the UE until all data that has been buffered on the radio channels (radio channels, RB) (including SRB and DRB) is completely passed through.

[0294] 816: the micro base station transmits data to the UE, and transmits data to the UE through the macro base station. Micro base station transmits data to SGW.

[0295] In the downlink direction, the micro base station may receive the downlink signal from the SGW and generate the downlink RLC PDU according to the downlink signal.

[0296] The micro base station can send the first part of the downlink RLC PDUs to the downlink RLC PDUs in the UE and send the second part of the downlink RLC PDUs in the downlink RLC PDU to the macro base station. The macro base station may send the second part of the downlink RLC PDUs to the UE.

[0297] In the uplink direction, the UE can generate uplink RLC PDUs, send the first part of the uplink RLC PDUs in the uplink RLC PDUs to the micro base station, and send the second part of the uplink RLC PDUs in the uplink RLC PDU to the macro base station. The macro base station sends the second part of the uplink RLC PDUs to the micro base station. The micro base station sends two parts of the RLC PDUs to the SGW after reassembling and completing the subsequent processing of the two parts of the RLC PDUs.

[0298] It should be understood that the sequence numbers of the above procedures do not indicate the sequence of execution. The sequence of procedures should be determined according to the functions and their internal logic, and should not constitute a limitation on the procedure for implementing the embodiment of the present invention.

[0299] In an embodiment of the present invention, the macro base station serves as an anchor point of the user plane, so that the macro base station and the micro base station have the ability to combine data transmission to the UE, thereby improving the peak speed and throughput of the UE.

[0300] Furthermore, service of the UE should not be transmitted between the macro base station and the micro base station, thus also avoiding the delay or interruption of the service caused by the handover.

[0301] FIG. 9 is a schematic diagram of an example protocol plane of a control plane according to an embodiment of the present invention.

[0302] An example of a protocol stack of a control plane in FIG. 9 can be applied to the examples in FIG. 5 - FIG. 8. It is assumed that initially the UE and the macro base station create an RRC connection; the control plane function is provided by the macro base station, all control plane messages are transmitted between the macro base station and the UE, and the data of the signaling radio channel (signaling channel, SRB) is not shared. Signaling related to the control plane can be transmitted between the macro base station and the micro base station via the X2 interface or through direct communication between the macro base station and the micro base station. It should be understood that although an SRB that is not partitioned is used as an example for the descriptions in FIG. 9, in an embodiment of the present invention, SRB data may also be partitioned.

[0303] As shown in FIG. 9, trunks between RRC layers, PDCP layers, RLC layers, MAC layers and PHY layers of the macro base station and the UE represent logical connections over the air interface between the macro base station and the UE, between peer protocol layers and represent that after data is sent at the levels of the protocol of the transmitting side, they are processed at equal levels of the protocol of the receiving side, data having the same format and the same content as the data on the transmitting side is formed.

[0304] For communication between the macro base station and the UE, the control plane data transmission procedure may be as follows: on the transmitting side after processing at the protocol layers, namely, at the PDCP layer, RLC layer, MAC layer and PHY layer, the RRC message is sent to the receiver side through the radio interface; control plane data received by the receiving side via the radio interface is first processed at the PHY level, and then forwarded to the MAC layer, RLC layer, PDCP layer and RRC layer sequentially for processing. It should be understood that in this work, if the transmitting side is a macro base station, then the receiving side is a UE. If the transmitting side is a UE, then the receiving side is a macro base station.

[0305] It is possible that no control plane data is transmitted between the micro base station and the UE.

[0306] It should be noted that in the example of FIG. 9, the control plane function provided by the macro base station is used as an example for descriptions. However, in an embodiment of the present invention, the control plane function can also be provided by the macro base station and the micro base station together, for example, in the case where a UE located in the common coverage area of the macro base station and the micro base station initially has RRC connections with both the macro base station and the micro base station, the control plane function can be provided together with the macro base station and the micro base station.

[0307] FIG. 10 is a schematic diagram of an example user plane protocol stack according to an embodiment of the present invention.

[0308] In FIG. 10, it is assumed that the macro base station is the anchor point of the user plane, and the two DRBs of the macro base station should be separated.

[0309] 1) The user protocol stack of the macro base station plane is described as follows:

[0310] On the macro side, the DRBs to be split are DRB1 and DRB2; creating a PDCP PDCP1, an RLC RLC1, and a logical channel LCH1, which correspond to DRB1; PDCP2, RLC2, and LCH2 are created that correspond to DRB2; a logical channel is located between the RLC layer and the MAC layer, and neither LCH1 nor LCH2 are shown in FIG. 10. It is assumed that in the macro base station, the carrier participating in the aggregation is CC1, and the corresponding cell is the primary cell (primary cell, PCell), MAC MAC1 and PHY PHY1 are created for PCell, and HARQ HARQ1 is created at MAC . LCH1 corresponding to DRB1 and LCH2 corresponding to DRB2 are both mapped to a downlink shared transport channel (DL-SCH shared channel) DL-SCH1 or to an uplink shared transport channel (uplink shared channel communication lines, UL-SCH) UL-SCH1 using MAC layer; a transport channel is located between the MAC layer and the PHY layer, and neither DL-SCH1 nor UL-SCH1 are shown in FIG. 10.

[0311] Trunks between PDCP layers, RLC layers, MAC layers and PHY layers of the macro base station and UE represent logical connections over the air interface between the macro base station and the UE, between peer protocol layers, and represent that after the data sent at the levels of the protocol of the transmitting side, they are processed at equal levels of the protocol of the receiving side, data having the same format and the same content as data on the transmitting side is generated. DRB1 macro base station corresponds to DRB1 UE, and accordingly, PDCP1 and RLC1 macro base station correspond to PDCP1 and RLC1 UE; PDCP2 and RLC2 of the macro base station correspond to PDCP2 and RLC2 of the UE.

[0312] The RLC level trunk between the macro base station and the micro base station represents that data separation is performed at the RLC level; RLC1 and RLC2 of the macro base station correspond to RLC1 and RLC2 of the micro base station, respectively.

[0313] For communication between the macro base station and the UE, the user plane data transmission procedure may be as follows:

[0314] For the downlink signal, an Internet Protocol (Internet Protocol, IP) data packet from the SGW is sent to the UE via the radio interface after processing at the protocol layers, namely, at the PDCP layer, RLC layer, MAC layer and PHY layer of the macro base station. The UE may first process the data that is received via the radio interface at the PHY level, and then forward the data to the MAC layer, RLC layer, and PDCP layer sequentially for processing.

[0315] For uplink data, after processing the IP data packet that arrives from the application layer at the protocol layers, namely, at the PDCP layer, RLC layer, MAC layer and PHY layer, the UE sends the processed IP data packet to the macro base station through the radio interface. The macro base station can first process the data that is received via the radio interface at the PHY level, and then forward the data to the MAC layer, RLC layer, and PDCP layer sequentially for processing.

[0316] 2) The protocol plane of the user plane of the micro base station is described as follows:

[0317] On the side of the micro base station, respectively, the DRBs to be partitioned are DRB1 and DRB2, which are used to separate the data DRB1 and the data DRB2 of the macro base station, respectively, and the division is performed at the RLC level. The micro base station RLC layer provides a transmission buffer and a retransmission buffer, and can support the re-segmentation function of RLC PDUs. The corresponding RLC entity RLC1 and logical channel LCH1 are created for DRB1; corresponding RLC2 and LCH2 are created for DRB2; a logical channel is located between the RLC layer and the MAC layer, and neither LCH1 nor LCH2 are shown in FIG. 10. In the micro base station, the carrier participating in the aggregation is CC2, and the corresponding cell is a secondary cell (secondary cell, SCell); MAC MAC2 and PHY PHY2 are created for SCell, and a HARQ HARQ2 is created at the MAC. The logical channel DRB1 and the logical channel DRB2 are both mapped to the DL-SCH2 or UL-SCH2 transport channel using the MAC layer; a transport channel is located between the MAC layer and the PHY layer, and neither DL-SCH2 nor UL-SCH2 are shown in FIG. 10.

[0318] Connections between RLC layers, MAC layers, and PHY layers of the micro base station and UE represent logical connections over the air interface between the micro base station and the UE, between peer protocol layers, and represent that after the data sent at the protocol layers of the transmitting side, are processed at equal levels of the protocol of the receiving side, data having the same format and the same content as the data on the transmitting side is generated. Micro base station DRB1 corresponds to DRB1 UE; accordingly, the RLC1 of the micro base station corresponds to the RLC1 of the UE; and RLC2 of the micro base station corresponds to RLC2 of the UE.

[0319] The RLC level trunk between the macro base station and the micro base station represents that data separation is performed at the RLC level; RLC1 and RLC2 of the macro base station correspond to RLC1 and RLC2 of the micro base station, respectively.

[0320] For communication between the micro base station and the UE, the user plane data transmission procedure may be as follows:

[0321] For a downlink signal, the micro base station can store in the transmission buffer the corresponding RLC object RLC PDUs from the macro base station to wait for scheduling and send the RLC PDUs to the UE via the radio interface after processing the RLC PDUs at protocol levels, namely, at the RLC level , MAC level, and PHY level. If the RLC PDUs cannot be sent completely due to radio resource limitations, when the RLC PDUs are sent for the first time, the RLC PDUs can be segmented; it should be noted that the segmentation in this case is performed according to the re-segmentation method for the RLC PDUs in the conventional protocol, and not the segmentation method for the RLC SDUs in the conventional protocol. The UE may first process the data that is received via the radio interface at the PHY level, and then forward the data to the MAC layer, the RLC layer, and the PDCP layer for processing.

[0322] For uplink data, after processing the IP data packet that arrives from the application layer at the protocol layers, namely, at the PDCP layer, RLC layer, MAC layer and PHY layer, the UE can send the IP data packet to the micro base station through the radio interface. Data received by the micro base station via the radio interface is first processed at the PHY level and then forwarded to the MAC and RLC sequentially; RLC PDUs are formed at the RLC level and sent via the X2 interface to the RLC entity corresponding to the macro base station.

[0323] 3) The protocol plane of the user plane of the UE is described as follows:

[0324] On the UE side, the DRBs are DRB1 and DRB2; creating a PDCP entity PDCP1, an RLC entity RLC1, and a logical channel LCH1 that correspond to DRB1; PDCP2, RLC2, and LCH2 are created that correspond to DRB2; a logical channel is located between the RLC layer and the MAC layer, and neither LCH1 nor LCH2 are shown in FIG. 10. The UE may be configured with a MAC layer, which includes a multiplexing / demultiplexing (multiplexing / demultiplexing) entity, and this entity is not shown in FIG. 10. After the multiplexing / demultiplexing entity, two HARQ objects HARQ1 and HARQ2 are configured, which respectively correspond to the PCell of the macro base station and the SCell of the micro base station, which are aggregated by the UE. PCell is configured with a PHY level of PHY1, and SCell is configured with a PHY level of PHY2, with PHY1 and PHY2 corresponding to HARQ1 and HARQ2 of the MAC level, respectively.

[0325] The logical channel DRB1 and the logical channel DRB2 are both mapped to the transport channel DL-SCH1 or UL-SCH1, or DL-SCH2 or UL-SCH2 using the MAC layer; a transport channel is located between the MAC layer and the PHY layer, and none of the DL-SCH1, UL-SCH1, DL-SCH2 and UL-SCH2 are shown in FIG. 10.

[0326] The method for communication between the UE, the macro base station and the micro base station is similar to the above descriptions of the macro base station side and the micro base station side, and is not described again in this paper to avoid repetition.

[0327] In the protocol stack of the control plane of FIG. 9 and the user plane protocol stack of FIG. 10 level 2 (level 2) may include a PDCP layer, an RLC layer, and a MAC layer.

[0328] FIG. 11 is a schematic block diagram of a level 2 protocol stack of a macro base station according to an embodiment of the present invention.

[0329] As shown in FIG. 11, the main functions of the PDCP layer may include header compression (reliable header compression, ROHC), security (security), and so on, and the security function may include integrity protection (integrity protection) and encryption (encryption).

[0330] The main functions of the RLC layer may include segmentation, re-segmentation, automatic retransmission request (automatic retransmission request, ARQ), and so on.

[0331] The main functions of the MAC layer may include scheduling / priority processing, multiplexing / demultiplexing, HARQ, and so on.

[0332] A service access point (service access point, SAP) between the PDCP layer and the upper application layer, and SAP between the PDCP layer and the RLC layer provides RB. SAP between the RLC layer and the MAC layer provides LCH. The SAP between the MAC layer and the physical layer provides a transport channel (transport channel), and the transport channel may include DL-SCH and UL-SCH.

[0333] A macro base station may provide PCell for the UE, and one HARQ entity may be created for the MAC layer of the macro base station.

[0334] FIG. 12 is a schematic block diagram of a level 2 protocol stack of a micro base station according to an embodiment of the present invention.

[0335] In FIG. 12 that DRB is split at the RLC level is used as an example for descriptions. Neither the PDCP entity nor the corresponding function is created for the micro base station. The RLC level of a micro base station may be equivalent to expanding the RLC level of a macro base station, provides part of the functions of the RLC level, and does not have to provide all of the RLC functions.

[0336] The micro base station receives RLC PDUs that send the RLC layer of the macro base station via the X2 interface or direct communication, and stores the RLC PDUs in the transmit buffer at the RLC level of the micro base station. The micro base station may further receive an RLC status report that sends the RLC layer to the macro base station via the X2 interface or direct communication and retransmit to the UE and according to the RLC status report the RLC PDUs to be retransmitted. The micro base station can receive RLC PDUs sent by the UE, store the RLC PDUs in the receive buffer at the RLC level of the micro base station, and route the RLC PDUs to the macro base station.

[0337] The functions of the MAC layer are similar to the functions of the MAC layer of the macro base station in FIG. 11, and are not described repeatedly in this work to avoid repetition.

[0338] The micro base station may provide SCell for the UE, and one HARQ entity is created for the MAC layer of the micro base station.

[0339] FIG. 13 is a schematic block diagram of a layer 2 in a protocol stack of a UE according to an embodiment of the present invention.

[0340] FIG. 13, the functions of the PDCP layer, the RLC layer, and the MAC layer of the UE are similar to the functions of the corresponding protocol layers of the macro base station in FIG. 11, and are not described repeatedly in this work to avoid repetition.

[0341] The MAC layer of the UE may be configured with two HARQ entities that correspond to CC1 provided by the macro base station and CC2 provided by the micro base station, respectively. Accordingly, the HARQ entity on CC1 can be mapped to DL-SCH and UL-SCH on CC1, and the HARQ entity on CC2 can be mapped to DL-SCH and UL-SCH on CC2. The logical channels LCH1 and LCH2 of the UE may be mapped to DL-SCH and UL-SCH on CC1, or DL-SCH and UL-SCH on CC2.

[0342] it Should be noted that if each macro base station and / or micro base station provides more CC, for example, if each macro base station and micro base station provides two CC, then two HARQ objects can be created at the MAC level at level 2 of the structure the macro base station, and accordingly, correspond to two CCs provided by the macro base station, wherein the structures of the PDCP layer and the RLC layer are the same as the structures of the PDCP layer and the RLC layer in FIG. 11. Two HARQ objects can be created at the MAC level at level 2 of the micro base station structure, and accordingly correspond to two CCs provided by the micro base station, the RLC layer structure being the same as the RLC layer structure in FIG. 12.

[0343] Four HARQ entities may be created at the MAC level at layer 2 of the UE structure, and accordingly, they correspond to two CCs provided by the macro base station and two CCs provided by the micro base station.

[0344] With reference to the user plane protocol stack in FIG. 10, the following describes in detail a downlink data transmission procedure according to an embodiment of the present invention. FIG. 14 is a schematic flowchart of a procedure of a data transmission method according to an embodiment of the present invention. In FIG. 14 of the downlink data transfer procedure in step 611 of FIG. 6 will be described in detail.

[0345] 1401: a macro base station generates downlink PDCP PDUs and forwards the downlink PDCP PDUs to the RLC layer.

[0346] A macro base station uses downlink IP data packets from SGW as a PDCP SDU, generates PDCP PDUs after processing, such as header compression, encryption and adding PDCP sequence number (sequence number, SN), at the PDCP layer, and forwards PDCP PDUs to the RLC layer to serve as RLC SDUs. The macro base station forwards the PDCP PDU in PDCP1 to RLC1, and forwards the PDCP PDU in PDCP2 to RLC2.

[0347] 1402: the macro base station determines the first part of the downlink RLC PDU for which the macro base station is responsible for supply, and the second part of the downlink RLC PDU for which the micro base station is responsible.

[0348] The macro base station may determine, according to the DRB partitioning policy and the QoS parameter configuration, which are determined or agreed in advance, the amount of data to be shared, that is, which downlink RLC SDUs are allocated to the macro base station and which downlink RLC SDUs Communications are distributed by the micro base station.

[0349] For the downlink RLC SDUs for which the macro base station is responsible, the MAC level of the macro base station can be determined according to QoS requirements and the radio resource situation of the macro base station, the amount of data that can be scheduled in a particular transmission time interval (transmission time interval) , TTI), and indicate for the RLC layer the size of the downlink RLC PDUs to be generated; the MAC layer may indicate for the RLC layer the total size of one or more downlink RLC PDUs to be generated; and the RLC layer may generate the first part of the downlink RLC PDUs after processing such as segmenting, combining and adding header information such as RLC SN, downlink RLC SDUs according to the downlink RLC PDU size indicated by the MAC layer. The RLC1 and RLC2 in the macro base station may individually generate different downlink RLC PDUs. In a particular TTI, each of RLC1 and RLC2 can generate one or more different downlink RLC PDUs, and it is also possible that only RLC1 or RLC2 generates one or more different downlink RLC PDUs.

[0350] For the downlink RLC SDUs to be allocated to the micro base station, the macro level of the macro base station can determine according to the separation policy and QoS requirement the amount of data that can be allocated to the micro base station in the TTI, and thus indicate the size for the RLC level The downlink RLC PDU to be generated; the MAC layer may indicate for the RLC layer the total size of one or more downlink RLC PDUs to be generated; the RLC layer can generate the second part of the downlink RLC PDUs after processing such as segmenting, combining and adding header information such as RLC SN, downlink RLC SDUs according to the downlink RLC PDU size indicated by the MAC layer. In a particular TTI, each of RLC1 and RLC2 can generate one or more different RLC PDUs that will be allocated to the micro base station, and it is also possible that only RLC1 or RLC2 will generate one or more different downlink RLC PDUs that will be distributed by micro base station.

[0351] 1403: the macro base station sends the first portion of the downlink RLC PDU to the UE.

[0352] The macro base station RLC layer may forward the generated first portion of the downlink RLC PDU to the macro layer of the macro base station; The MAC layer of the macro base station uses the first part of the downlink RLC PDU as a MAC SDU and generates a MAC PDU, which is also referred to as a transport unit (transport unit, TB), after multiplexing (multiplexing) the MAC SDU with the MAC SDU of the current logical channel and / or another logical channel; and the first part of the downlink RLC PDU in RLC1 and the first part of the downlink RLC PDU in RLC2 can be multiplexed in the same TB. After forwarded to the macro base station PHY level, the TB is sent to the UE using the PHY level of the physical downlink shared channel (physical downlink shared channel, PDSCH) in PCell.

[0353] 1404: the macro base station sends the second part of the downlink RLC PDUs to the micro base station.

[0354] The macro base station may send the second part of the downlink RLC PDUs to the micro base station via the X2 interface or direct communication between the macro base station and the micro base station.

[0355] 1405: the micro base station is preparing to deliver the second part of the downlink RLC PDU.

[0356] After receiving the second part of the downlink RLC PDUs from the macro base station RLC1, the micro base station may store the second part of the downlink RLC PDUs in the transmission buffer in the micro base station RLC1. After receiving the second part of the downlink RLC PDU from RLC2 of the macro base station, the micro base station may store the second part of the downlink RLC PDU in the transmission buffer in the RLC2 of the micro base station.

[0357] The MAC level of the micro base station determines, according to the separation policy and the QoS requirement, the amount of data that can be scheduled in a particular TTI, and indicates for the RLC level the size of the downlink RLC PDU to be generated.

[0358] The MAC layer may indicate for the RLC layer the total size of one or more downlink RLC PDUs. The MAC layer may indicate for the RLC layer the size of the source downlink RLC PDU, which implies that one or more source downlink RLC PDUs stored in the transmit buffer in the RLC are directly forwarded without any processing to the MAC layer and used in SDU MAC quality. Alternatively, the MAC layer may indicate for the RLC layer the total size of the downlink RLC PDUs is smaller than the original size of the downlink RLC PDUs, which implies that the original downlink RLC PDUs are re-segmented into segments (segments) of the downlink RLC PDUs, which must be forwarded to the MAC layer, and no additional RLC SNs are added at the RLC layer.

[0359] The RLC layer of the micro base station does not have to support the RLC PDU combining function. It should be noted that in a particular TTI, each of RLC1 and RLC2 can forward one or more different source downlink RLC PDUs or segments of a downlink RLC PDU to a MAC layer, with only the last downlink RLC PDU being a downlink RLC PDU segment link, or it is possible that only RLC1 or RLC2 forwards the downlink RLC PDU to the MAC layer.

[0360] A micro base station can increase the priority of a UE in a CA scenario between base stations to provide the radio resources required for data sharing, thereby allocating a sufficient amount of downlink resources to send the original second portion of the downlink RLC PDU allocated to the micro base station. Alternatively, if the radio resources allocated to the UE cannot accommodate the original second part of the downlink RLC PDUs due to resource limitations of the radio interface, at the RLC level of the micro base station, the original second part of the downlink RLC PDUs must be re-segmented.

[0361] 1406: the micro base station sends the second part of the downlink RLC PDUs to the UE.

[0362] The RLC level of the micro base station may forward the original second part of the downlink RLC PDUs or the segment of the downlink RLC PDUs obtained after re-segmentation of the second part of the downlink RLC PDUs to the MAC level of the micro base station to be used in MAC SDU quality; The MAC level of the micro base station generates a MAC PDU, or is called TB, after multiplexing the MAC SDU with the MAC SDU of the current logical channel and / or another logical channel, wherein the downlink RLC PDUs in RLC1 and the downlink RLC PDUs in RLC2 can be multiplexed in that same TB. After being forwarded to the PHY level of the micro base station, the TBs are sent to the UE using the PHY level of the PDSCH in SCell.

[0363] The micro base station may send downlink RLC PDUs in ascending order of RLC SN. In AM RLC, the micro base station does not need to support the AM RLC transmission window.

[0364] 1407: The UE receives the first part of the downlink RLC PDU and the second part of the downlink RLC PDU and reassembles the first part of the downlink RLC PDU and the second part of the downlink RLC PDU to form the downlink RLC SDU.

[0365] After receiving physical layer data on the PCell PDSCH and SCell PDSCH, the UE individually forwards the corresponding TBs to the corresponding HARQ1 and HARQ2 at the MAC layer after processing in PHY1 and PHY2 completes successfully; after separate TB channel separation, the MAC layer forwards the MAC SDU, namely the RLC PDU, to the respective RLC entities RLC1 and RLC2. The RLC level of the UE cannot be distinguished according to PCell and SCell, but it only differs as RLC1 and RLC2 according to DRB; the HARQ entity of the MAC layer and the PHY layer can be distinguished according to different serving cells, and it is transparent to the RLC level of the UE.

[0366] After the RLC layer of the UE receives RLC PDUs that forward the MAC layer, RLC1 and RLC2 can perform the corresponding procedure for receiving RLC PDUs according to whether the RLC mode is UM RLC or AM RLC (each RLC entity is in one of two RLC modes), form successfully received RLC PDUs in the RLC SDUs in ascending order of RLC SNs and forward the RLC SDUs to the PDCP layer.

[0367] It should be understood that the sequence numbers of the above procedures do not indicate the sequence of execution. The sequence of procedures should be determined according to the functions and their internal logic, and should not constitute a limitation on the procedure for implementing the embodiment of the present invention. For example, step 1403 may be performed in parallel with steps 1404 to 1406, or step 1404 may be performed before step 1403.

[0368] During the transmission procedure of the first part of the downlink RLC PDU and the second part of the downlink RLC PDU, a retransmission may be required due to the communication condition. The following describes in detail the data retransmission procedure with reference to FIG. 15 and FIG. 16.

[0369] FIG. 15 is a schematic flowchart of a downlink signal retransmission procedure according to an embodiment of the present invention.

[0370] FIG. 15 a procedure for retransmission of a downlink RLC PDU to an AM RLC in FIG. 14 will be described in detail.

[0371] 1501: The UE receives the first part of the downlink RLC PDU and the second part of the downlink RLC PDU and generates the first RLC status report according to reception situations of the first part of the downlink RLC PDU and the second part of the downlink RLC PDU.

[0372] It should be noted that the UE may generate a first RLC status report corresponding to RLC1 according to reception situations of a first part of a downlink RLC PDU and a second part of a downlink RLC PDU, and may generate a first RLC status report corresponding to RLC2 according to reception situations of a first part of a downlink RLC PDU and a second part of an RLC2 downlink RLC.

[0373] 1502: The UE sends the first RLC status report to the macro base station.

[0374] The UE may send a first RLC status report corresponding to RLC1 and a first RLC status report corresponding to RLC2 to the macro base station individually.

[0375] 1503: When the first RLC status report indicates RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs, the macro base station retransmits to the UE RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs . When the first RLC status report indicates an RLC PDU, which, as confirmed by the UE, is successfully received, the macro base station updates the RLC AM transmission window and the corresponding status variable so as to continue sending a new RLC PDU.

[0376] With reference to FIG. 10 and FIG. 14, the macro base station RLC1 and RLC2 may individually determine according to the respective first RLC status reports which RLC PDUs in the first part of the downlink RLC PDUs must be retransmitted (retransmitted) and which RLC PDUs in the second part of the downlink RLC PDU Communications must be retransmitted using the micro base station.

[0377] The macro base station RLC1 and RLC2 may individually retransmit to the RLC PDUs UE, which are to be retransmitted in the first parts of the downlink RLC PDUs corresponding to RLC1 and RLC2.

[0378] 1504: When the first RLC status report indicates RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs, the macro base station sends the first RLC status report or retransmission message to the micro base station.

[0379] The macro base station may send the first RLC status report to the micro base station via the X2 interface or direct communication.

[0380] A macro base station may also generate a retransmission message according to the first RLC status report, wherein the retransmission message may indicate RLC PDUs to be retransmitted in the second part of the downlink RLC PDU.

[0381] 1505: the micro base station retransmits to the UE according to the first RLC status report or retransmission message of the RLC PDUs to be retransmitted in the second part of the downlink RLC PDU.

[0382] With reference to FIG. 10 and FIG. 14, the RLC1 and RLC2 of the micro base station may individually determine according to the respective first RLC status reports that the RLC PDUs in the second parts of the downlink RLC PDUs must be retransmitted corresponding RLC1 and RLC2. The RLC1 and RLC2 of the micro base station can individually retransmit to the RLC PDUs UE, which are to be retransmitted in the second parts of the downlink RLC PDUs corresponding to RLC1 and RLC2.

[0383] For RLC PDUs to be retransmitted in the second part of the downlink RLC PDU, if the number of retransmission times of the micro base station reaches a predetermined number of times but does not reach the maximum number of retransmission times, the micro base station can notify the macro base station to complete the retransmission. The micro base station may send the second part of the downlink RLC PDU to be retransmitted to the macro base station, or the macro base station stores in the retransmission buffer copies for each RLC PDU in the second part of the downlink RLC PDU allocated to the micro base station, and the micro base station directly notifies the macro base station of the RLC SN PDUs to be retransmitted in the second part of the downlink RLC PDU.

[0384] Alternatively, when the macro base station receives the first RLC status report of the UE, the macro base station can retransmit when it is determined that the micro base station should retransmit and the number of times the retransmission in the micro base station reaches a predetermined number of times, but does not reach the maximum number of times a retransmission. In this case, the macro base station may instruct the micro base station to transmit the associated RLC PDUs to be retransmitted back to the macro base station, or the macro base station stores copies for each RLC PDU in the second part of the downlink RLC PDU in the retransmission buffer, distributed micro base station; in the case where the macro base station determines that a retransmission should be performed separately, the macro base station changes in the first RLC status report sent to the micro base station the state of the corresponding RLC PDU that will be retransmitted to the acknowledgment (acknowledgment, ACK).

[0385] It should be understood that the sequence numbers of the above procedures do not indicate the sequence of execution. The sequence of procedures should be determined according to the functions and their internal logic, and should not constitute a limitation on the procedure for implementing the embodiment of the present invention. For example, step 1503 may be performed in parallel with steps 1504 to 1505, or step 1504 and step 1505 may be performed before step 1503.

[0386] In FIG. 15 The UE may send the first RLC status report to the macro base station. In addition, the UE may also send the first RLC status report to the micro base station. The following provides descriptions with reference to FIG. 16.

[0387] FIG. 16 is a schematic flowchart of a downlink signal retransmission procedure according to an embodiment of the present invention.

[0388] In FIG. 16, a procedure for retransmission of a downlink RLC PDU to an AM RLC in FIG. 14 will be described in detail.

[0389] 1601: The UE generates a first RLC status report according to reception situations of a first part of a downlink RLC PDU and a second part of a downlink RLC PDU.

[0390] It should be noted that the UE may generate a first RLC status report corresponding to RLC1 according to reception situations of a first part of a downlink RLC PDU and a second part of a downlink RLC PDU, and may generate a first RLC status report corresponding to RLC2 according to reception situations of a first part of a downlink RLC PDU and a second part of an RLC2 downlink RLC.

[0391] 1602: The UE sends the first RLC status report to the micro base station.

[0392] If the SCell has uplink resources, then the UE may send the first RLC status report to the micro base station.

[0393] 1603: When the first RLC status report indicates RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs, the micro base station retransmits to the UE RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs .

[0394] With reference to FIG. 10 and FIG. 14, the micro base station RLC1 and RLC2 may individually determine according to the respective first RLC status reports that the RLC PDUs in the second parts of the downlink RLC PDUs corresponding to RLC1 and RLC2 should be retransmitted. The micro base station RLC1 and RLC2 may individually retransmit to the RLC PDUs to be retransmitted in the second parts of the downlink RLC PDUs corresponding to RLC1 and RLC2.

[0395] 1604: the micro base station sends the first RLC status report to the macro base station.

[0396] 1605: the macro base station retransmits to the UE according to the first RLC status report RLC PDUs to be retransmitted in the first part of the downlink RLC PDU.

[0397] When the first RLC status report indicates RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs, the macro base station retransmits to the UE RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs.

[0398] When the first RLC status report indicates an RLC PDU, which, as confirmed by the UE, is successfully received, the macro base station may be prompted to update the AM RLC transmission window and the corresponding status variable to continue sending the new RLC PDU.

[0399] With reference to FIG. 10 and FIG. 14, the macro base station RLC1 and RLC2 may individually determine according to the respective first RLC status reports that the RLC PDUs in the first parts of the downlink RLC PDUs must be retransmitted corresponding RLC1 and RLC2. The macro base station RLC1 and RLC2 may separately transmit to the RLC PDUs UE, which must be retransmitted in the first parts of the downlink RLC PDU corresponding to RLC1 and RLC2. For RLC PDUs to be retransmitted in the second part of the downlink RLC PDU, if the number of retransmission times of the micro base station reaches a predetermined number of times but does not reach the maximum number of retransmission times, then processing can be performed according to the method described in FIG. 15. To avoid repetition, descriptions are not provided repeatedly in this paper.

[0400] With reference to FIG. 15 and FIG. 16, it should be understood that the UE may individually send the first RLC status report corresponding to RLC1 to the macro base station and send the first RLC status report corresponding to RLC2 to the micro base station; alternatively, the UE may individually send the first RLC status report corresponding to RLC1 to the micro base station and send the first RLC status report corresponding to RLC2 to the macro base station.

[0401] It should be understood that the sequence numbers of the above procedures do not indicate the sequence of execution. The sequence of procedures should be determined according to the functions and their internal logic, and should not constitute a limitation on the procedure for implementing the embodiment of the present invention. For example, step 1603 may be performed in parallel with steps 1604 to 1605, or step 1604 and step 1605 may be performed before step 1603.

[0402] The following describes in detail a procedure for transmitting data in an uplink direction according to an embodiment of the present invention with reference to a user plane protocol stack in FIG. 10. FIG. 17 is a schematic flowchart of a procedure of a data transmission method according to an embodiment of the present invention. In FIG. 17, the data transmission procedure in the uplink direction in step 611 of FIG. 6 will be described in detail.

[0403] 1701: The UE sends a buffer status report (buffer status report, BSR) to the macro base station.

[0404] When the macro base station has available uplink resources, the UE may send the BSR to the macro base station.

[0405] It should be noted that, at step 1701, the UE can also send the BSR to the micro base station when the micro base station has available uplink resources.

[0406] In a particular TTI, a UE may send at most one BSR from a regular BSR (regular BSR) or a periodic BSR (periodic BSR) type. If in a particular TTI the macro base station and the micro base station both allocate an uplink grant for the UE, then the UE can send only one regular BSR or periodic BSR to the macro base station or micro base station, but it is not allowed to send a regular BSR or periodic BSR at the same time to the macro base station and to the micro base station.

[0407] The BSR reflects the available data volume of all logical channels in each logical channel group (logical channel group, LCG) of the UE after the MAC PDU is generated in a particular TTI, and usually there are a maximum of four logical channel groups. There are two ways to determine the buffer size level (buffer size level) of each LCG in the BSR, which includes the BSR and the extended BSR, wherein the BSR or the extended BSR can be configured by RRC.

[0408] BSR formats can be classified into long BSR (long BSR), short BSR (short BSR), or truncated BSR (truncated BSR). A long BSR may include the amount of buffer data of four LCGs; the buffer size (buffer size) corresponding to each logical channel group includes the available total data volume of all logical channels in the logical channel group, which includes the amounts of data that will be sent at the RLC level and at the PDCP level.

[0409] The types of BSR or extended BSR can be classified into regular BSR, periodic BSR and fill BSR (fill BSR). For example, when uplink data reaches a high priority logical channel, a regular BSR is triggered. When the periodic BSR timer expires, the periodic BSR starts. When the uplink resources allocated by the UE still have a pad bit (pad bit) after setting the MAC SDU, the pad bit can carry the pad BSR. The priority of the regular BSR and the priority of the periodic BSR are higher than the priority of the fill BSR.

[0410] 1702: a macro base station allocates uplink resources for a UE according to the BSR.

[0411] A macro base station may determine according to a DRB partitioning policy and QoS parameter configuration, which are determined or agreed upon in advance, the amount of data to be shared. Uplink resources are allocated to the UE according to the amount of data allocated to the current base station, radio conditions or QoS parameter, and so on.

[0412] 1703: the macro base station sends the first uplink grant information (UL grant) to the UE, wherein the first uplink grant information indicates the uplink resources allocated to the UE by the macro base station.

[0413] After allocating the uplink resources for the UE, the macro base station sends the first uplink grant information to the UE in the physical downlink control channel (physical downlink control channel, PDCCH).

[0414] 1704: a macro base station sends a BSR to a micro base station.

[0415] The macro base station may direct the BSR to the micro base station via an X2 interface or direct communication.

[0416] In addition, the macro base station may also change the amount of buffer data of the corresponding logical channel group in the BSR according to the amount of data to be allocated to the micro base station, and send the modified BSR to the micro base station. Macro base station can indicate in a message in the X2 interface whether the sent BSR is the original BSR or a modified BSR, or agree in advance which BSR to send, the original BSR, or a modified BSR.

[0417] 1705: the micro base station allocates uplink resources for the UE according to the BSR.

[0418] If the BSR received by the micro base station is the source BSR, then the amount of data to be allocated to the micro base station can be determined according to the DRB partitioning policy and QoS parameter configuration, which are determined or agreed upon in advance, and the buffer amount of data corresponding logical channel groups in the original BSR may vary.

[0419] If the BSR received by the micro base station is a modified BSR, then the buffer amount of data in the corresponding logical channel group in the changed BSR can be used directly, and uplink resources can be allocated to the UE according to the buffer amount of data, radio conditions, QoS parameter and so on.

[0420] 1706: the micro base station sends the second uplink grant information to the UE, wherein the second uplink grant information indicates the uplink resources allocated to the UE by the micro base station.

[0421] The micro base station may send second uplink grant information to the UE on the PDCCH.

[0422] 1707: The UE determines, according to the first uplink grant information and the second uplink grant information, the amount of data to be sent for each logical channel.

[0423] The UE may determine, based on the logical channel priority processing procedure, and according to the first uplink grant information and the second uplink grant information, the amount of data sent on the PCell and / or SCell uplink grant of each logical channel. The MAC indicates the size of the uplink RLC PDUs for RLC1 and / or RLC2. The MAC layer may indicate for the RLC layer the total size of one or more uplink RLC PDUs to be generated.

[0424] 1708: The UE generates an uplink RLC PDU.

[0425] After processing such as segmenting, combining and adding header information such as SN RLC, uplink RLC SDUs according to the size of the uplink RLC PDUs indicated by the MAC layer, the MAC UE may generate uplink RLC PDUs communication. RLC1 and RLC2 individually generate different uplink RLC PDUs. In a particular TTI, each of RLC1 and RLC2 can generate one or more different uplink RLC PDUs, and it is also possible that only RLC1 or RLC2 generates uplink RLC PDUs.

[0426] 1709: The UE sends to PCell the first part of the uplink RLC PDUs in the uplink RLC PDUs to the macro base station.

[0427] The RLC1 and RLC2 of the UEs can forward the uplink RLC PDUs that are generated according to the MAC direction to the MAC, and the uplink RLC PDUs are used as the uplink MAC SDU.

[0428] The MAC generates an uplink MAC PDU, or referred to as TB, after multiplexing an uplink MAC SDU with an SD SD MAC uplink of a current logical channel and / or another logical channel. RLC PDUs in RLC1 and RLC2 can be multiplexed in the same TB. The MAC generated TB for HARQ1 is forwarded to PHY1, and PHY1 sends a PCell TB to the macro base station on the physical uplink shared channel (physical uplink shared channel, PUSCH).

[0429] 1710: The UE sends to SCell a second portion of the uplink RLC PDUs in the uplink RLC PDUs to the micro base station.

[0430] The TB generated by the MAC UE for HARQ2 is forwarded to PHY2, and PHY2 sends to the PUSCH SCell TB to the micro base station.

[0431] 1711: the micro base station sends the second part of the uplink RLC PDUs to the macro base station.

[0432] After processing the data that is received in the SCELL PUSCH in PHY2 and MAC2, the micro base station forwards the MAC SDU, namely the RLC PDUs, to RLC1 and RLC2, and stores the RLC PDUs in the receive buffers corresponding to RLC1 and RLC2. In AM RLC, the micro base station does not have to support the AM RLC receive window or perform the reordering (reordering) function.

[0433] The micro base station can send the second part of the uplink RLC PDUs to the macro base station using X2 or direct communication.

[0434] A macro base station receives RLC PDUs from a micro base station and stores RLC PDUs in receive buffers corresponding to RLC1 and RLC2.

[0435] 1712: a macro base station receives a first part of an uplink RLC PDU and a second part of an uplink RLC PDU and reassembles a first part of an uplink RLC PDU and a second part of an uplink RLC PDU.

[0436] After processing the data received from the UE on the PUSCH PCell in PHY1 and MAC1, the macro base station forwards the MAC SDU, namely the first part of the uplink RLC PDU, to RLC1 and RLC2, and stores the first part of the uplink RLC PDU communications in receive buffers corresponding to RLC1 and RLC2.

[0437] The macro base station may also store the second portion of the uplink RLC PDUs that are received from the micro base station in receive buffers corresponding to RLC1 and RLC2.

[0438] A macro base station can reassemble the first part of the uplink RLC PDUs and the second part of the uplink RLC PDUs according to all receive situations in the receive buffers corresponding to RLC1 and RLC2, and deliver the first part of the uplink RLC PDUs and the second part of the PDU RLC uplink to PDCP layer in ascending order of RLC SN. RLC1 and RLC2 can perform the corresponding procedure for receiving RLC PDUs according to whether the RLC mode is UM RLC or AM RLC (each RLC entity is in one of two RLC modes), and forward uplink RLC PDUs that are successfully received to the PDCP layer in ascending order of SN RLC.

[0439] It should be noted that in the above procedure, if the UE sends the BSR to the micro base station, then the micro base station may forward the received BSR to the macro base station.

[0440] Additionally, because each macro base station and micro base station can receive BSRs sent by the UE and BSRs sent by another base station, given the delay of the X2 interface if the macro base station or micro base a station receives successively within a short period of time, or simultaneously, a plurality of BSRs sent in different directions, it may be difficult for a macro base station and a micro base station to determine which BSR is the last. To solve this problem, time information can be added to BSRs sent by the UE, for example, time information can be time stamp information (time stamp) or system frame number (system frame number, SFN) and PCell or SCell subframe number information (subframe) .

[0441] Furthermore, a method for a UE to send a BSR can also be: in a particular TTI, when uplink resources are allocated for both the PCell provided by the macro base station and the SCell provided by the micro base station, send using the UE, regular BSRs or periodic BSRs in PCell and SCell at the same time, indicating in the BSR a checkbox indicating whether direction is required or not, and setting the checkbox to “no direction required”. It is required that BSRs sent to PCell and SCell at the same time have the same buffer size level value for the same LCG. In the case where the macro base station and the micro base station each provide a plurality of CCs and when the uplink resources are allocated to the multiple CCs of the macro base station and the micro base station in a particular TTI, the UEs provide the ability to send only one regular BSR or periodic BSR on the uplink resources communications of all CC macro base stations, and provide the ability to send only one regular BSR or periodic BSR on the uplink resources of all CC micro base stations.

[0442] During the transmission procedure of the first part of the uplink RLC PDU and the second part of the uplink RLC PDU due to communication conditions, a retransmission may be required. The following describes in detail the data retransmission procedure with reference to FIG. 18 and FIG. 19.

[0443] FIG. 18 is a schematic flowchart of an uplink data retransmission procedure according to an embodiment of the present invention. In FIG. 18 the procedure for retransmission of the uplink RLC PDUs in the AM RLC in FIG. 17 will be described in detail.

[0444] 1801: a macro base station receives a first part of an uplink RLC PDU and a second part of an uplink RLC PDU and generates a second RLC status report according to reception situations of a first part of an uplink RLC PDU and a second part of an uplink RLC PDU.

[0445] 1802: the macro base station sends a second RLC status report to the UE.

[0446] 1803: the UE determines the uplink retransmission set according to the second RLC status report, wherein the uplink retransmission set includes RLC PDUs that are to be retransmitted in the first part of the uplink RLC PDU and / or PDU RLCs to be retransmitted in the second part of the uplink RLC PDU.

[0447] According to the second RLC status report, when the second RLC status report indicates the RLC PDU, which, as confirmed by the macro base station, is received successfully, the UE can update the RLC AM transmission window and the corresponding status variable so as to continue sending new RLC PDU.

[0448] The UE may divide the uplink retransmission set into a first uplink retransmission subset and a second uplink retransmission subset according to the first PCell uplink grant information and / or the second SCell uplink grant information, and determines that you should retransmit the first subset of the uplink retransmission to the macro base station and retransmit the second subset of the retransmission of the uplink to the micro base station.

[0449] 1804: The UE retransmits the RLC PDUs in the first subset of the uplink retransmission to the macro base station.

[0450] 1805: The UE retransmits the RLC PDUs in the second subset of the uplink retransmission to the micro base station.

[0451] FIG. 19 is a schematic flowchart of an uplink data retransmission procedure according to an embodiment of the present invention. In FIG. 19 a procedure for retransmission of an uplink RLC PDU in an AM RLC in FIG. 17 will be described in detail.

[0452] Steps 1901 to 1903 in FIG. 19 are similar to steps 1801 to 1803 in FIG. 18, and are not described repeatedly in this work to avoid repetition.

[0453] 1904: The UE sends an RLC PDU in an uplink retransmission set to a macro base station.

[0454] The UE may determine according to the first PCell uplink grant information and / or the second SCell uplink grant information that it should retransmit to the macro base station all uplink RLC PDUs that are to be retransmitted.

[0455] FIG. 20 is a schematic flowchart of an uplink data retransmission procedure according to an embodiment of the present invention. In FIG. 20 a procedure for retransmission of an uplink RLC PDU in an AM RLC in FIG. 17 will be described in detail.

[0456] Steps 2001-2003 of FIG. 20 are similar to steps 1801 to 1803 in FIG. 18, and are not described repeatedly in this work to avoid repetition.

[0457] 2004: The UE sends the RLC PDUs in the uplink retransmission set to the micro base station.

[0458] The UE may determine, according to the first PCell uplink grant information and / or the second SCell uplink grant information, that all uplink RLC PDUs to be retransmitted to the micro base station should be retransmitted.

[0459] 2005: the micro base station sends the RLC PDUs in the uplink retransmission set to the macro base station.

[0460] The micro base station may send to the macro base station via the X2 interface or through the direct communication of the uplink RLC PDUs to be retransmitted.

[0461] FIG. 21 is a schematic flowchart of an RRC connection re-creation procedure according to an embodiment of the present invention.

[0462] In FIG. 21, the first base station may be one of a macro base station and a micro base station, and the second base station may be another base station.

[0463] 2101: The UE sends an RRC connection re-creation request message to the macro base station.

[0464] In the case where the retransmission of the RLC PDU is performed a maximum number of times, or the PCL RLM determines that a radio link failure (radio link failure, RLF) is occurring, or the random access procedure on the PCell fails, or the reconfiguration of the RRC connection fails, or the check the integrity fails, or the handover fails, and so on, the UE may perform cell selection and still select PCell when the PCell radio conditions are good. In this case, the UE sends a RRC connection re-creation request message to the macro base station and initiates the RRC connection re-creation procedure, which includes pausing (pausing) all RBs except SRB0, resetting the MAC using the default physical channel configuration, using the specified the default is the main configuration of the MAC layer (main configuration of the MAC), and so on. Unlike the prior art, during the re-establishment of an RRC SCell connection provided by the micro base station cannot be released.

[0465] 2102: the macro base station sends a re-creation notification message to the micro base station.

[0466] The re-creation notification message may include a DRB-related parameter, and may instruct the micro base station to suspend the DRB that is being split.

[0467] 2103: the micro base station suspends according to the DRB re-creation notification message that is being split, and reconfigures the parameter associated with the DRB.

[0468] 2104: the macro base station sends an RRC connection re-creation message (RRCConnectionReestablishment) to the UE.

[0469] 2105: According to the RRC connection re-creation message, the UE re-creates the PDCP object and the RLC object SRB1, performs the radio resource configuration procedure, restores SRB1, and so on.

[0470] 2106: The UE sends an RRC connection re-establishment completion message (RRCConnectionReestablishmentComplete) to the macro base station.

[0471] 2107: the macro base station sends an RRC connection re-establishment completion message to the micro base station.

[0472] It should be understood that the sequence numbers of the above procedures do not indicate the sequence of execution. The sequence of procedures should be determined according to the functions and their internal logic, and should not constitute a limitation on the procedure for implementing the embodiment of the present invention. For example, step 2102 may be performed in parallel with steps 2103 to 2104, or step 2103 and step 2104 may be performed before step 2102.

[0473] FIG. 22 is a schematic structural diagram of a base station according to an embodiment of the present invention. Base station 2200 in FIG. 22 is the above first base station. Base station 2200 includes a generating unit 2201 and a sending unit 2202.

[0474] The generating unit 2201 generates RLC PDUs. Sending unit 2202 sends to the UE the first part of the downlink RLC PDUs in the downlink RLC PDUs and sends the second part of the downlink RLC PDUs to the second base station to the downlink RLC PDUs so that the second base station sends the second part to the UE Downlink RLC PDUs.

[0475] In an embodiment of the present invention, the first part of the downlink RLC PDUs in the downlink RLC PDUs are sent to the UE, the second part of the downlink RLC PDUs in the downlink RLC PDUs are sent to the second base station, and the second base station sends to The UE is the second part of the downlink RLC PDU, so that the two base stations have the ability to send data together to the UE, thereby improving the peak speed and throughput of the UE.

[0476] For other operations and functions of the base station 2200, reference may be made to procedures involving the first base station in the above embodiments of the method of FIG. 2a - FIG. 21, and to avoid repetition, descriptions are not provided repeatedly in this work.

[0477] Further, as another embodiment, the base station 2200 may further include a first receiving unit 2203.

[0478] The first receiving unit 2203 may receive the first part of the uplink RLC PDUs in the uplink RLC PDUs generated by the UE from the UE, and receive the second part of the uplink RLC PDUs in the uplink RLC PDUs from the second base station, wherein the second part of the uplink RLC PDU is received by the second base station from the UE.

[0479] Further, as another embodiment, the base station 2200 may further include a second reception unit 2204. The second receiving unit 2204 may receive a first RLC status report from the UE. When the first RLC status report indicates RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs, the sending unit 2202 can retransmit to the RLC UUs UEs to be retransmitted in the first part of the downlink RLC PDUs.

[0480] The sending unit 2202 may further send a first RLC status report to a second base station, the first RLC status report indicating RLC PDUs to be retransmitted in the second part of the downlink RLC PDU, or sending a retransmission message to the second base station, wherein a retransmission message is generated by the first base station according to the first RLC status report, and the retransmission message indicates RLC PDUs to be retransmitted in the second part of the RLC PDO yaschey link.

[0481] Additionally, as another embodiment, the base station 2200 may further include a third reception unit 2205 and a first determination unit 2206.

[0482] A third reception unit 2205 may receive a first RLC status report from a second base station, the first RLC status report being received by a second base station from the UE.

[0483] The first determination unit 2206 may determine according to the first RLC status report RLC PDUs to be retransmitted in the first part of the downlink RLC PDU.

[0484] The sending unit 2202 may further retransmit to the RLC PDUs UE, which are to be retransmitted in the first part of the downlink RLC PDU.

[0485] Further, as another embodiment, the base station 2200 may further include a fourth reception unit 2207.

[0486] The generating unit 2201 may further generate a second RLC status report according to reception situations of a first part of an uplink RLC PDU and a second part of an uplink RLC PDU. Sending unit 2202 may further send a second RLC status report to the UE.

[0487] The fourth reception unit 2207 may receive RLC PDUs in the uplink retransmission set determined by the UE according to the second RLC status report, wherein the uplink retransmission set includes RLC PDUs to be retransmitted in the first part The uplink RLC PDUs and / or RLC PDUs to be retransmitted in the second part of the uplink RLC PDUs.

[0488] Further, as another embodiment, the fourth reception unit 2207 may receive RLC PDUs in the uplink retransmission set from the UE; or receive RLC PDUs in the first subset of the uplink retransmission from the UE and receive RLC PDUs in the second subset of the uplink retransmission from the second base station, wherein the RLC PDUs in the second subset of the uplink retransmission are received using the second base station from the UE , and the first subset of the uplink retransmission and the second subset of the uplink retransmission are obtained by the UE by dividing the uplink retransmission set; or receive RLC PDUs in the uplink retransmission set from the second base station, wherein RLC PDUs in the uplink retransmission set are received using the second base station from the UE.

[0489] Additionally, as another embodiment, the sending unit 2202 may send in the first cell of the base station 2200 the first part of the downlink RLC PDUs to the UE and send the second part of the downlink RLC PDUs to the second base station so that the second base station sent to the UE in the second cell of the second base station the second part of the downlink RLC PDUs, wherein the coverage of the first cell and the second cell overlap.

[0490] Additionally, as another embodiment, base station 2200 may further include a fifth reception unit 2208.

[0491] The sending unit 2202 may further send the first request message to the second base station, the first request message being used to instruct the second base station to configure the second cell for the UE.

[0492] A fifth reception unit 2208 may receive a first response message from a second base station, wherein the first response message carries resource information of the second cell, and resource information of the second cell is determined using the second base station according to the first request message.

[0493] The sending unit 2202 may further send an RRC radio resource control connection reconfiguration message to the UE, the RRC connection reconfiguration message transferring resource information of the second cell.

[0494] Further, as another embodiment, the first request message may be further used to instruct the second base station to create DRBs for the UE.

[0495] Further, as another embodiment, the base station 2200 may further include a sixth reception unit 2209 and a second determination unit 2210.

[0496] The sixth receiving unit 2209 may receive a second request message from the second base station, the second request message being used to instruct the base station 2200 to configure the first cell for the UE.

[0497] The second determination unit 2210 may determine resource information of the first cell according to the second request message.

[0498] The sending unit 2201 may further send a second response message to the second base station, the second response message transferring resource information of the first cell, so that the second base station notifies the UE of the resource information of the first cell.

[0499] Additionally, as another embodiment, the base station 2200 may further include a creating unit 2211.

[0500] The second request message may be further used to instruct the base station to create a DRB for the UE, and the creating unit 2211 may create, according to the second request message, a PDCP entity, an RLC entity, and a logical channel that correspond to DRBs.

[0501] Additionally, as another embodiment, the second request message may be further used to instruct the base station 2200 to be responsible for sharing data.

[0502] The sending unit 2202 may further send a path switching request message to the MME according to the second request message, so that the MME requests, according to the path switching request message, the serving gateway to switch the data path to the path from the serving gateway to base station 2200.

[0503] Additionally, the aforementioned first reception unit - the sixth reception unit may be the same reception unit or identical reception units. For example, the operations of the first receiving unit - the sixth receiving unit can be completed using the receiver.

[0504] FIG. 23 is a schematic structural diagram of a base station according to an embodiment of the present invention. Base station 2300 is the aforementioned second base station. Base station 2300 includes a receiving unit 2310 and a sending unit 2320.

[0505] The reception unit 2310 receives from the first base station a second portion of the downlink RLC PDUs in the downlink RLC PDUs generated by the first base station. Block 2320 sends to the UE the second part of the downlink RLC PDU.

[0506] In an embodiment of the present invention, the second part of the downlink RLC PDUs in the downlink RLC PDUs generated by the first base station are sent to the UE, thereby improving the peak speed and throughput of the UE.

[0507] For other functions and operations of the base station 2300, reference may be made to procedures involving the second base station in the above embodiments of the method of FIG. 2a - FIG. 21, and to avoid repetition, descriptions are not provided repeatedly in this work.

[0508] Further, as another embodiment, the reception unit 2310 may further receive from the UE the second portion of the uplink RLC PDUs in the uplink RLC PDUs generated by the UE. Sending unit 2320 may further send the second portion of the uplink RLC PDUs to the first base station.

[0509] Further, as another embodiment, the base station 2300 may further include a first determination unit 2330.

[0510] The reception unit 2310 may receive a first RLC status report from the first base station; the first determining unit 2330 may determine according to the first RLC status report RLC PDUs to be retransmitted in the second part of the downlink RLC PDU; and the sending unit 2320 may further retransmit to the RLC PDUs UE, which are to be retransmitted in the second part of the downlink RLC PDU.

[0511] Alternatively, the receiving unit 2310 may further receive a retransmission message from the first base station, and the sending unit 2320 may further retransmit to the UE according to the retransmission message of the RLC PDUs to be retransmitted in the second part of the downlink RLC PDU, wherein the first retransmission message indicates RLC PDUs to be retransmitted in the second part of the downlink RLC PDU.

[0512] Additionally, as another embodiment, the receiving unit 2310 may further receive a first RLC status report from the UE. Sending unit 2320 may further send a first RLC status report to the first base station, so that when the first RLC status report indicates RLC PDUs to be retransmitted in the first part of the downlink RLC PDU, the first base station can retransmit to the UE RLC PDUs to be retransmitted in the first part of the downlink RLC PDU. When the first RLC status report indicates RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs, the sending unit 2320 may further retransmit to the RLC UUs that must be retransmitted in the second part of the downlink RLC PDUs.

[0513] Further, as another embodiment, the reception unit 2310 may further receive RLC PDUs in the uplink retransmission set from the UE, and the sending unit 2320 may further send RLC PDUs in the uplink retransmission set to the first base station, wherein the uplink retransmission set includes RLC PDUs to be retransmitted in the first part of the uplink RLC PDUs and / or RLC PDUs to be retransmitted in the second part of the uplink RLC PDUs communication.

[0514] Alternatively, the reception unit 2310 may further receive RLC PDUs in the second uplink retransmission subset from the UE, and the sending unit 2320 may further send RLC PDUs in the second uplink retransmission subset to the first base station, the second subset of the retransmission the uplink transmission is obtained by the UE by dividing the uplink retransmission set.

[0515] Additionally, as another embodiment, the sending unit 2320 may send to the UE in the second cell of the base station 2300 a second portion of the downlink RLC PDU.

[0516] Further, as another embodiment, the base station 2300 may further include a second determination unit 2340. The receiving unit 2310 may further receive a first request message from a first base station, the first request message being used to instruct the base station to configure a second cell for the UE.

[0517] The second determination unit 2340 may determine resource information of the second cell according to the first request message.

[0518] The sending unit 2320 may further send a first response message to the first base station, the first response message transferring resource information of the second cell, so that the first base station notifies the UE of the resource information of the second cell.

[0519] Additionally, as another embodiment, the base station 2300 may further include a creation unit 2350.

[0520] The first request message may be further used to instruct the base station 2300 to create a DRB for the UE. Block 2350 creation can create according to the first request message, the RLC object and the logical channel, which correspond to the DRB.

[0521] Further, as another embodiment, the sending unit 2320 may further send a second request message to the first base station, the second request message being used to instruct the first base station to configure the first cell of the first base station for the UE. The receiving unit 2310 may further receive a second response message from the first base station, wherein the second response message carries resource information of the first cell, and resource information of the first cell is determined using the first base station according to the second request message. Sending unit 2320 may further send an RRC radio resource control connection reconfiguration message to the UE, wherein the RRC connection reconfiguration message carries resource information of the first cell.

[0522] Further, as another embodiment, the second request message is further used to instruct the first base station to create DRBs for the UE.

[0523] FIG. 24 is a schematic block diagram of a UE according to an embodiment of the present invention. UE 2400 includes a reception unit 2410 and a first generation unit 2420.

[0524] The receiving unit 2410 receives from the first base station a first part of a downlink RLC PDU in a downlink RLC PDU generated by a first base station, and receives from a second base station a second part of a downlink RLC PDU in a downlink RLC PDU communication, the second part of the downlink RLC PDU being received by the second base station from the first base station. The first generation unit 2420 reassembles the first part of the downlink RLC PDU and the second part of the downlink RLC PDU to form the downlink RLC SDU.

[0525] In an embodiment of the present invention, the UE receives from the first base station a first part of a downlink RLC PDU in a downlink RLC PDU and receives from a second base station a second part of a downlink RLC PDU that are obtained by a second base station from the first the base station, so that the UE is able to transmit data to these two base stations together, thereby improving the peak speed and throughput of the UE.

[0526] For other functions and operations of the UE 2400, reference may be made to procedures involving the UE in the above embodiments of the method of FIG. 2a - FIG. 21, and to avoid repetition, descriptions are not provided repeatedly in this work.

[0527] Additionally, as another embodiment, the UE 2400 may further include a first sending unit 2430. The first generation unit 2420 may generate uplink RLC PDUs. The first sending unit 2440 may send the first part of the uplink RLC PDUs in the uplink RLC PDUs to the first base station and send the second part of the uplink RLC PDUs in the uplink RLC PDUs to the second base station.

[0528] Additionally, as another embodiment, the UE 2400 may further include a second generation unit 2440 and a second sending unit 2450.

[0529] The second generation unit 2440 may generate a first RLC status report according to reception situations of a first part of a downlink RLC PDU and a second part of a downlink RLC PDU, the first RLC status report indicating RLC PDUs to be retransmitted in the first part Downlink RLC PDUs and / or RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs.

[0530] The second sending unit 2450 may send the first RLC status report to the first base station or to the second base station.

[0531] The receiving unit 2410 may further receive RLC PDUs that must be retransmitted in the first part of the downlink RLC PDUs from the first base station, and / or receive RLC PDUs that must be retransmitted in the second part of the downlink RLC PDUs, from the second base station.

[0532] Additionally, as another embodiment, the UE 2400 may further include a determining unit 2460 and a third sending unit 2470.

[0533] The reception unit 2410 may further receive a second RLC status report from the first base station.

[0534] The determination unit 2460 may determine an uplink retransmission set according to a second RLC status report, wherein the uplink retransmission set includes RLC PDUs to be retransmitted in the first part of the uplink RLC PDU, and / or RLC PDUs to be retransmitted in the second part of the uplink RLC PDU.

[0535] The third sending unit 2470 may send RLC PDUs in the uplink retransmission set to the first base station or send RLC PDUs in the uplink retransmission set to the second base station, or send RLC PDUs in the first uplink retransmission subset to the first base station and send the RLC PDUs in the second uplink retransmission subset to the second base station, wherein the first uplink retransmission subset and the second retransmission subset to the downlink is obtained by the UE by dividing the uplink retransmission set.

[0536] Further, as another embodiment, the receiving unit 2410 may receive a first part of a downlink RLC PDU from a first cell of a first base station and receive a second part of a downlink RLC PDU from a second cell of a second base station, wherein the first cell and the second cover the cells overlap.

[0537] Additionally, as another embodiment, the reception unit 2410 may further receive a RRC radio resource control connection reconfiguration message from the first base station, wherein the RRC connection reconfiguration message carries resource information of the second cell, and resource information of the second cell is determined using the second base station.

[0538] Additionally, as another embodiment, the reception unit 2410 may further receive an RRC connection reconfiguration message from a second base station, wherein the RRC connection reconfiguration message carries resource information of the first cell, and resource information of the first cell is determined using the first base station.

[0539] Additionally, the above first sending unit — the third sending unit may be the same sending unit or identical sending units. For example, the operations of the first sending unit - the third sending unit can be completed using a transmitter.

[0540] FIG. 25 is a schematic structural diagram of a base station according to an embodiment of the present invention. Base station 2500 in FIG. 25 is the above first base station. Base station 2500 includes a processor 2510 and a transmitter 2520.

[0541] The processor 2510 generates RLC PDUs. The transmitter 2520 sends to the UE the first part of the downlink RLC PDUs in the downlink RLC PDUs and sends the second part of the downlink RLC PDUs to the second base station to the downlink RLC PDUs so that the second base station sends the second part of the PDUs to the UE Downlink RLC.

[0542] In an embodiment of the present invention, the first part of the downlink RLC PDU in the downlink RLC PDU is sent to the UE, the second part of the downlink RLC PDU in the downlink RLC PDU is sent to the second base station, and the second base station sends to The UE is the second part of the downlink RLC PDU, so that the two base stations have the ability to send data together to the UE, thereby improving the peak speed and throughput of the UE.

[0543] For other operations and functions of the base station 2500, reference may be made to procedures involving the first base station in the above embodiments of the method of FIG. 2a - FIG. 21, and to avoid repetition, descriptions are not provided repeatedly in this work.

[0544] Additionally, as another embodiment, the base station 2500 may further include a receiver 2530.

[0545] The receiver 2530 may receive the first part of the uplink RLC PDUs in the uplink RLC PDUs generated by the UE from the UE and receive the second part of the uplink RLC PDUs in the uplink RLC PDUs from the second base station, the second a portion of the uplink RLC PDU is received by the second base station from the UE.

[0546] Additionally, as another embodiment, the receiver 2530 may receive a first RLC status report from the UE. When the first RLC status report indicates RLC PDUs to be retransmitted in the first part of the downlink RLC PDUs, the transmitter 2520 may retransmit to the RLC UUs that must be retransmitted in the first part of the downlink RLC PDUs.

[0547] The transmitter 2520 may further send a first RLC status report to a second base station, the first RLC status report indicating RLC PDUs to be retransmitted in the second part of the downlink RLC PDU, or send a retransmission message to the second base station wherein the retransmission message is generated by the first base station according to the first RLC status report, and the retransmission message indicates the RLC PDUs to be retransmitted in the second part of the RLC downlink her communication lines.

[0548] Additionally, as another embodiment, the receiver 2530 may receive a first RLC status report from a second base station, wherein the first RLC status report is received using the second base station from the UE.

[0549] The processor 2510 may determine, according to the first RLC status report, RLC PDUs to be retransmitted in the first part of the downlink RLC PDU.

[0550] The transmitter 2520 may further retransmit to the RLC PDUs UE, which are to be retransmitted in the first part of the downlink RLC PDU.

[0551] Further, as another embodiment, the processor 2510 may further generate a second RLC status report according to reception situations of a first part of an uplink RLC PDU and a second part of an uplink RLC PDU. Transmitter 2520 may optionally send a second RLC status report to the UE.

[0552] The receiver 2530 may receive RLC PDUs in the uplink retransmission set determined by the UE according to the second RLC status report, wherein the uplink retransmission set includes RLC PDUs to be retransmitted in the first part of the PDU The uplink RLCs and / or RLC PDUs to be retransmitted in the second part of the uplink RLC PDUs.

[0553] Further, as another embodiment, the receiver 2530 may receive RLC PDUs in the uplink retransmission set from the UE; or receive RLC PDUs in the first subset of the uplink retransmission from the UE and receive RLC PDUs in the second subset of the uplink retransmission from the second base station, wherein the RLC PDUs in the second subset of the uplink retransmission are received using the second base station from the UE , and the first subset of the uplink retransmission and the second subset of the uplink retransmission are obtained by the UE by dividing the uplink retransmission set; or receive RLC PDUs in the uplink retransmission set from the second base station, wherein RLC PDUs in the uplink retransmission set are received using the second base station from the UE.

[0554] Additionally, as another embodiment, the transmitter 2520 can send the first part of the downlink RLC PDUs to the UE in the first cell of the base station 2500 and send the second part of the downlink RLC PDUs to the second base station so that the second base station sends in the UE in the second cell of the second base station, the second part of the downlink RLC PDUs, wherein the coverage of the first cell and the second cell overlap.

[0555] Further, as another embodiment, the transmitter 2520 may further send a first request message to a second base station, wherein the first request message may be used to instruct the second base station to configure a second cell for the UE.

[0556] A receiver 2530 may receive a first response message from a second base station, wherein the first response message carries resource information of the second cell, and resource information of the second cell is determined using the second base station according to the first request message.

[0557] The transmitter 2520 may further send an RRC Radio Resource Control Connection reconfiguration message to the UE, wherein the RRC Connection Reconfiguration message carries resource information of the second cell.

[0558] Further, as another embodiment, the first request message may be further used to instruct the second base station to create DRBs for the UE.

[0559] Further, as another embodiment, the receiver 2530 may receive a second request message from a second base station, the second request message being used to instruct base station 2500 to configure the first cell for the UE.

[0560] The processor 2510 may determine resource information of the first cell according to the second request message.

[0561] The transmitter 2520 may further send a second response message to the second base station, the second response message transferring resource information of the first cell, so that the second base station notifies the UE of the resource information of the first cell.

[0562] Further, as another embodiment, the second request message may be further used to instruct the base station to create DRBs for the UE. The processor 2510 may create, according to the second request message, a PDCP entity, an RLC entity, and a logical channel that correspond to DRBs.

[0563] Further, as another embodiment, the second request message may be further used to instruct base station 2200 to be responsible for sharing data.

[0564] The transmitter 2520 may further send a path switching request message to the MME according to the second request message, so that the MME requests, according to the path switching request message, the serving gateway to switch the data path to the path from the serving gateway to base station 2500.

[0565] FIG. 26 is a schematic block diagram of a base station according to an embodiment of the present invention. Base station 2600 is the aforementioned second base station. Base station 2600 includes a receiver 2610 and a transmitter 2620.

[0566] The receiver 2610 receives from the first base station a second portion of the downlink RLC PDUs in the downlink RLC PDUs generated by the first base station. A transmitter 2620 sends to the UE a second portion of the downlink RLC PDU.

[0567] In an embodiment of the present invention, the second part of the downlink RLC PDUs in the downlink RLC PDUs generated by the first base station are sent to the UE, thereby improving the peak speed and throughput of the UE.

[0568] For other functions and operations of base station 2600, reference may be made to procedures involving a second base station in the above embodiments of the method of FIG. 2a - FIG. 21, and to avoid repetition, descriptions are not provided repeatedly in this work.

[0569] Further, as another embodiment, the receiver 2610 may further receive from the UE a second portion of the uplink RLC PDUs in the uplink RLC PDUs generated by the UE. Transmitter 2620 may optionally send a second portion of the uplink RLC PDUs to the first base station.

[0570] Additionally, as another embodiment, base station 2600 may further include a processor 2630. Receiver 2610 may receive a first RLC status report from a first base station; the processor 2630 may determine according to the first RLC status report RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs; and the transmitter 2620 may further retransmit to the RLC PDUs UE, which are to be retransmitted in the second part of the downlink RLC PDU.

[0571] Alternatively, the receiver 2610 may further receive a retransmission message from the first base station, and the transmitter 2620 may further retransmit to the UE according to the retransmission message of the RLC PDUs to be retransmitted in the second part of the downlink RLC PDU, the first message retransmission indicates the RLC PDUs to be retransmitted in the second part of the downlink RLC PDU.

[0572] Further, as another embodiment, the receiver 2610 may further receive a first RLC status report from the UE. The transmitter 2620 may further send the first RLC status report to the first base station, so that when the first RLC status report indicates RLC PDUs to be retransmitted in the first part of the downlink RLC PDU, the first base station retransmits the RLC PDUs to the UE to be retransmitted in the first part of the downlink RLC PDU. When the first RLC status report indicates RLC PDUs that are to be retransmitted in the second part of the downlink RLC PDUs, the transmitter 2620 can further retransmit to the RLC UUs that must be retransmitted in the second part of the downlink RLC PDUs.

[0573] Further, as another embodiment, the receiver 2610 may further receive RLC PDUs in the uplink retransmission set from the UE, and transmitter 2620 may further send RLC PDUs in the uplink retransmission set to the first base station, wherein the retransmission set the uplink transmission includes RLC PDUs that must be retransmitted in the first part of the uplink RLC PDUs and / or RLC PDUs that must be retransmitted in the second part of the uplink RLC PDUs .

[0574] Alternatively, receiver 2610 may further receive RLC PDUs in the second uplink retransmission subset from the UE, and transmitter 2620 may further send RLC PDUs in the second uplink retransmission subset to the first base station, the second upstream retransmission subset the link is obtained by the UE by dividing the uplink retransmission set.

[0575] Additionally, as another embodiment, the transmitter 2620 may send in the second cell of the base station 2600 a second portion of the downlink RLC PDUs to the UE.

[0576] Further, as another embodiment, the receiver 2610 may further receive a first request message from a first base station, wherein the first request message can be used to instruct the base station to configure a second cell for the UE.

[0577] The processor 2630 may determine the resource information of the second cell according to the first request message.

[0578] The transmitter 2620 may further send a first response message to the first base station, wherein the first response message carries resource information of the second cell, so that the first base station notifies the UE of the resource information of the second cell.

[0579] Further, as another embodiment, the first request message may be further used to instruct base station 2600 to create DRBs for the UE. The processor 2630 may create, according to the first request message, an RLC entity and a logical channel that correspond to DRBs.

[0580] Further, as another embodiment, the transmitter 2620 may further send a second request message to the first base station, the second request message being used to instruct the first base station to configure the first cell of the first base station for the UE. The receiver 2610 may further receive a second response message from the first base station, wherein the second response message carries resource information of the first cell, and resource information of the first cell is determined using the first base station according to the second request message. The transmitter 2620 may further send an RRC Radio Resource Control Connection reconfiguration message to the UE, wherein the RRC Connection Reconfiguration message carries resource information of the first cell.

[0581] Further, as another embodiment, the second request message is further used to instruct the first base station to create DRBs for the UE.

[0582] FIG. 27 is a schematic block diagram of a UE according to an embodiment of the present invention. The UE 2700 includes a receiver 2710 and a processor 2720.

[0583] A receiver 2710 receives from a first base station a first portion of a downlink RLC PDU in a downlink RLC PDU generated by a first base station, and receives a second portion of a downlink RLC PDU from a second base station in a downlink RLC PDU wherein the second part of the downlink RLC PDU is received by the second base station from the first base station. The processor 2720 reassembles the first part of the downlink RLC PDUs and the second part of the downlink RLC PDUs to form a downlink RLC SDU.

[0584] In an embodiment of the present invention, the UE receives from the first base station a first portion of a downlink RLC PDU in a downlink RLC PDU and receives from a second base station a second portion of a downlink RLC PDU that are obtained by a second base station from the first the base station, so that the UE is able to transmit data to these two base stations together, thereby improving the peak speed and throughput of the UE.

[0585] For other functions and operations of the UE 2700, reference may be made to procedures involving the UE in the above embodiments of the method of FIG. 2a - FIG. 21, and to avoid repetition, descriptions are not provided repeatedly in this work.

[0586] Additionally, as another embodiment, the UE 2700 may further include a transmitter 2730. A processor 2720 may generate an uplink RLC PDU. The transmitter 2730 can send the first part of the uplink RLC PDUs in the uplink RLC PDUs to the first base station and send the second part of the uplink RLC PDUs in the uplink RLC PDUs to the second base station.

[0587] Additionally, as another embodiment, the processor 2720 may generate a first RLC status report according to reception situations of a first part of a downlink RLC PDU and a second part of a downlink RLC PDU, wherein the first RLC status report indicates RLC PDUs that should retransmitted in the first part of the downlink RLC PDUs and / or RLC PDUs to be retransmitted in the second part of the downlink RLC PDUs.

[0588] The transmitter 2730 may send a first RLC status report to the first base station or to the second base station.

[0589] The receiver 2710 may further receive RLC PDUs that must be retransmitted in the first part of the downlink RLC PDUs from the first base station and / or receive RLC PDUs that must be retransmitted in the second part of the downlink RLC PDUs from second base station.

[0590] Additionally, as another embodiment, the receiver 2710 may further receive a second RLC status report from the first base station.

[0591] The processor 2720 may determine an uplink retransmission set according to a second RLC status report, wherein the uplink retransmission set includes RLC PDUs that are to be retransmitted in the first part of the uplink RLC PDU and / or PDU RLCs to be retransmitted in the second part of the uplink RLC PDU.

[0592] The transmitter 2730 may send RLC PDUs in the uplink retransmission set to the first base station or send RLC PDUs in the uplink retransmission set to the second base station, or send RLC PDUs in the first uplink retransmission subset to the first the base station and send the RLC PDUs in the second uplink retransmission subset to the second base station, wherein the first uplink retransmission subset and the second uplink retransmission subset inii connection obtained via UE by dividing the set retransmission uplink.

[0593] Additionally, as another embodiment, the receiver 2710 may receive a first part of a downlink RLC PDU from a first cell of a first base station and receive a second part of a downlink RLC PDU from a second cell of a second base station, wherein the coverage of the first cell and second cell overlap.

[0594] Further, as another embodiment, the receiver 2710 may further receive an RRC radio resource control connection reconfiguration message from the first base station, wherein the RRC connection reconfiguration message carries resource information of the second cell, and resource information of the second cell is determined using the second base station .

[0595] Further, as another embodiment, the receiver 2710 may further receive an RRC connection reconfiguration message from the second base station, wherein the RRC connection reconfiguration message carries resource information of the first cell, and resource information of the first cell is determined using the first base station.

[0596] In an embodiment of the present invention, the UE receives from the first base station a first part of a downlink RLC PDU in a downlink RLC PDU and receives from a second base station a second part of a downlink RLC PDU that are obtained by a second base station from the first base station, thereby improving the peak speed and throughput of the UE.

[0597] FIG. 28 is a schematic structural diagram of a base station according to an embodiment of the present invention. Base station 2800 in FIG. 28 is the above first base station. Base station 2800 includes a reception unit 2810 and a reassembly unit 2820.

[0598] The receiving unit 2810 receives from the UE the first part of the uplink RLC PDUs in the uplink RLC PDUs generated by the UE, and receives from the second base station the second part of the uplink RLC PDUs in the uplink RLC PDU, the second a portion of the uplink RLC PDU is received by the second base station from the UE. The reassembly unit 2820 reassembles the first part of the uplink RLC PDUs and the second part of the uplink RLC PDUs.

[0599] In an embodiment of the present invention, the first part of the uplink RLC PDUs in the uplink RLC PDUs generated by the UE is received from the UE, and the second part of the uplink RLC PDUs in the uplink RLC PDUs are received from the second base station , so that these two base stations have the ability to combine data transmission in the UE, thereby improving the peak speed and throughput of the UE.

[0600] For other functions and operations of the base station 2800, reference may be made to the procedure of the above embodiment of the method of FIG. 2b, and to avoid repetition, descriptions are not provided repeatedly in this work.

[0601] Further, as an embodiment, the base station may further include a generating unit 2830 and a sending unit 2840. Generator 2830 may generate a second RLC status report according to reception situations of a first part of an uplink RLC PDU and a second part of an uplink RLC PDU. Sending unit 2840 may send a second RLC status report to the UE. The reception unit 2810 may receive RLC PDUs in the uplink retransmission set determined by the UE according to the second RLC status report, wherein the uplink retransmission set includes RLC PDUs to be retransmitted in the first part of the uplink RLC PDU communications, and / or RLC PDUs to be retransmitted in the second part of the uplink RLC PDU.

[0602] Further, as another embodiment, the reception unit 2810 may receive RLC PDUs in the uplink retransmission set from the UE. Alternatively, the reception unit 2810 may receive RLC PDUs in the first uplink retransmission subset from the UE and receive RLC PDUs in the second uplink retransmission subset from the second base station, wherein the RLC PDUs in the second uplink retransmission subset are received using a second base station from the UE, and the first uplink retransmission subset and the second uplink retransmission subset are obtained by the UE by dividing the sunrise retransmission set communication lines. Alternatively, the reception unit 2810 may receive RLC PDUs in the uplink retransmission set from the second base station, wherein RLC PDUs in the uplink retransmission set are received using the second base station from the UE.

[0603] FIG. 29 is a schematic structural diagram of a base station according to an embodiment of the present invention. Base station 2900 in FIG. 29 may be the aforementioned second base station. Base station 2900 includes a receiving unit 2910 and a sending unit 2920.

[0604] The reception unit 2910 receives from the UE the second part of the uplink RLC PDUs in the uplink RLC PDUs generated by the UE. Block 2920 sends the second part of the uplink RLC PDUs to the first base station.

[0605] In an embodiment of the present invention, the second part of the uplink RLC PDUs in the uplink RLC PDUs generated by the UE are sent to the first base station, thereby improving the peak speed and throughput of the UE.

[0606] Further, as an embodiment, the reception unit 2910 may further receive RLC PDUs in the uplink retransmission set from the UE. Sending unit 2920 may further send RLC PDUs in the uplink retransmission set to the first base station, wherein the uplink retransmission set includes RLC PDUs to be retransmitted in the first part of the uplink RLC PDU and / or PDU RLCs to be retransmitted in the second part of the uplink RLC PDU. Alternatively, the receiving unit 2910 may receive the RLC PDUs in the second subset of the uplink retransmission from the UE and send the RLCs in the second subset of the uplink retransmission to the first base station, wherein the second subset of the uplink retransmission is obtained by the UE using dividing the uplink retransmission set.

[0607] FIG. 30 is a schematic block diagram of a UE according to an embodiment of the present invention. UE 3000 includes a generation unit 3010 and a sending unit 3020.

[0608] The generating unit 3010 generates an uplink RLC PDU. The sending unit 3020 sends the first part of the uplink RLC PDUs in the uplink RLC PDUs to the first base station and sends the second part of the uplink RLC PDUs in the uplink RLC PDUs to the second base station so that the second base station sends the second part of the PDU RLC uplink to the first base station.

[0609] In an embodiment of the present invention, the UE sends a first part of an uplink RLC PDU to an uplink RLC PDU to a first base station and sends a second part of an uplink RLC PDU to a second base station, and a second base station sends a second part of an RLC PDU uplink to the first base station, so that the UE is able to transmit data to these two base stations together, thereby improving the peak speed and throughput of the UE.

[0610] Additionally, as an embodiment, the UE 3000 may further include a reception unit 3030 and a determination unit 3040. The reception unit 3030 may receive a second RLC status report from the first base station. The determining unit 3040 may determine the uplink retransmission set according to the second RLC status report, wherein the uplink retransmission set includes RLC PDUs to be retransmitted in the first part of the uplink RLC PDUs and / or RLC PDUs, which must be retransmitted in the second part of the uplink RLC PDUs. Sending unit 3020 may further send RLC PDUs in the uplink retransmission set to the first base station, or send RLC PDUs in the uplink retransmission set to the second base station, or send RLC PDUs in the first subset of the uplink retransmission to the first base station the station and send the RLC PDUs in the second uplink retransmission subset to the second base station, the first uplink retransmission subset and the second retransmission subset and the uplink are obtained by the UE by dividing the uplink retransmission set.

[0611] In the case of a CA between base stations, the UE may transmit data to each base station in cells aggregated by each base station. When the traffic volume of the UE decreases or the radio conditions of the aggregated cells deteriorate, the UE must additionally “listen” to the channels of these cells, which causes the power consumption of the UE. An embodiment of the present invention provides a method for managing cell resources.

[0612] FIG. 31 is a schematic flowchart of a cell resource management method according to an embodiment of the present invention. The method of FIG. 31 is performed using the base station.

[0613] 3110: the first base station determines the activation time or deactivation time of the second cell of the second base station, the first base station being the primary base station and the second base station being the secondary base station.

[0614] The first base station is a primary base station, and the second base station is a secondary base station; then the second cell of the second base station is SCell. For example, the first base station may be a macro base station, and the second base station may be a micro base station.

[0615] When the indication signaling indicates the activation time of the second cell, the indication signaling may be an activation signaling. When the indication signaling indicates the deactivation time of the second cell, the indication signaling may be a deactivation signaling. For example, the activation signaling and the deactivation signaling may be a MAC (control element, control element) of the MAC.

[0616] 3120: the first base station individually notifies the second base station and the UE of the activation time or deactivation time of the second cell.

[0617] Further, as another embodiment, the first base station individually sends an indication signaling to the second base station and to the UE, wherein the indication signaling can be used to indicate the activation time or the deactivation time of the second cell.

[0618] Further, as another embodiment, the first base station may send indication signaling to the second base station so that the second base station sends indication signals to the UE, wherein the indication signaling can be used to indicate activation time or deactivation time of the second cell.

[0619] It should be noted that before the deactivation time is reached, the second base station can send RLC PDUs in the second cell RLC transmission buffer and RLC PDUs in the second cell RLC without receiving acknowledgment to the first base station, or notify the first base station of SN of the above RLC PDUs.

[0620] In an embodiment of the present invention, the first base station determines the activation time or deactivation time of the second cell of the second base station and notifies the UE of the activation time or deactivation time of the second cell, so that the UE can activate or deactivate the second cell, thereby preserving the power of the UE .

[0621] Furthermore, in an embodiment of the present invention, the first base station individually notifies the second base station and the UE of the activation time or the deactivation time of the second cell, and therefore it can be ensured that the actual activation or deactivation times between the second base station and the UE are the same , and the delay that occurs when the first base station and the second base station send indication signaling via the X2 interface can be eliminated.

[0622] FIG. 32 is a schematic flowchart of a cell resource management method according to an embodiment of the present invention. The method of FIG. 32 is performed by the UE.

[0623] 3210: the UE receives indication signaling from the first base station or from the second base station, wherein the indication signaling can be used to indicate the activation time or deactivation time of the second cell of the second base station, the first base station is the primary base station, the second base station is the secondary the base station, and the activation time or deactivation time of the second cell is determined using the first base station.

[0624] 3220: The UE performs an activation operation in the second cell when the activation time is reached, or the UE performs the deactivation operation in the second cell when the deactivation time is reached.

[0625] In an embodiment of the present invention, the UE receives the indication signaling from the first base station, so that the UE can activate or deactivate the second cell according to the indication signaling, thereby saving the power of the UE.

[0626] FIG. 33 is a schematic flowchart of a cell resource management method according to an embodiment of the present invention. The method of FIG. 33 are performed using the base station.

[0627] 3310: the second base station determines the activation time or deactivation time of the second cell of the second base station.

[0628] 3320: the second base station individually notifies the first base station and the UE of the activation time or deactivation time of the second cell, the first base station being the primary base station and the second base station being the secondary base station.

[0629] The first base station is a primary base station, and the second base station is a secondary base station; then the second cell of the second base station is SCell. For example, the first base station may be a macro base station, and the second base station may be a micro base station.

[0630] Additionally, as another embodiment, the second base station individually sends an indication signaling to the first base station and to the UE, wherein the indication signaling can be used to indicate the activation time or the deactivation time of the second cell.

[0631] Further, as another embodiment, the second base station may send indication signaling to the first base station so that the first base station sends indication signals to the UE, wherein the indication signaling can be used to indicate the activation time or the deactivation time of the second cell.

[0632] Further, as another embodiment, before the deactivation time is reached, the second base station can send RLC PDUs to the first base station without acknowledgment or unsent RLC PDUs in the RLC transmit buffer of the second cell, and RLC PDUs in the RLC receive buffer, or notify the first base station is about SN of the above RLC PDUs.

[0633] In an embodiment of the present invention, the second base station determines the activation time or deactivation time of the second cell of the second base station and notifies the UE of the activation time or deactivation time of the second cell, so that the UE can activate or deactivate the second cell, thereby preserving the power of the UE .

[0634] FIG. 34 is a schematic flowchart of a cell resource management method according to an embodiment of the present invention. The method of FIG. 34 is performed by the UE.

[0635] 3410: The UE receives indication signaling from a second base station or a first base station, wherein the indication signaling can be used to indicate the activation time or deactivation time of the second cell of the second base station, the first base station is the primary base station, the second base station is the secondary base station, and the activation time or deactivation time of the second cell is determined using the second base station.

[0636] 3420: The UE performs an activation operation in the second cell when the activation time is reached, or the UE performs the deactivation operation in the second cell when the deactivation time is reached.

[0637] In an embodiment of the present invention, the UE receives indication signaling from the first base station so that the UE can activate or deactivate the second cell according to the indication signaling, thereby saving power of the UE.

[0638] Furthermore, in another embodiment, the UE may further maintain a deactivation timer corresponding to the second cell of the second base station, and when the deactivation timer expires, the UE deactivates the second cell of the second base station and sends indication signals to the first base station and to the second base station, and indication signaling may be used to indicate that the second cell is being deactivated. The first base station may be a primary base station, and the second base station may be a secondary base station. After the second base station receives the indication signaling, the second base station can send the RLC PDUs in the second cell RLC transmission buffer and the RLC PDUs in the RLC reception buffer to the first base station without acknowledgment or notify the first base station of the SN the above RLC PDUs.

[0639] The following describes in detail a cell resource management method with reference to a specific example.

[0640] For example, it is assumed that the first base station is a macro base station and the second base station is a micro base station. A macro base station is a primary base station, and a micro base station is a secondary base station. It is assumed that the micro base station provides two carriers, namely CC1 and CC2, which correspond to serving cells SCell1 and SCell2, respectively; then the indication signaling for SCell1 and SCell2 can be sent to the UE in PCell in the macro base station and in SCell1 in the activated state or in SCell2 in the activated state. Assuming SCell1 is configured with PUCCH, SCell1 can only be deactivated after SCell2 is deactivated; and during activation, SCell1 must first be activated. In this case, SCell1 and SCell2 can also be activated or deactivated at the same time.

[0641] After SCell2 is deactivated, all RLC PDUs in RLC1 and RLC2 that are allocated to the micro base station can be mapped to SCell1 and sent or received.

[0642] The following provides descriptions with reference to the protocol stack shown in FIG. 10. After SCell1 of the micro base station is deactivated, in the RLC AM RLC PDUs without transmit acknowledgment in the RLC1 and RLC2 transmit buffers, the micro base station must be sent back to the macro base station, or the SNs of the corresponding RLC PDUs must be indicated for the macro base station (copies source RLC PDUs must be stored in the transmission buffer or in the retransmission buffer of the macro base station). In UM RLCs, non-sent RLC PDUs in the RLC1 and RLC2 transmission buffers of the micro base station must be sent back to the macro base station, or the SNs of the corresponding RLC PDUs must be indicated for the macro base station (copies of the original RLC PDUs must be stored in the transmission buffer or in the macro retransmission buffer base station). In AM RLC and UM RLC, RLC PDUs in receive buffers RLC1 and RLC2 should be sent to the macro base station.

[0643] After SCell1 of the micro base station is deactivated, the RLC PDUs in RLC1 and RLC2 of the macro base station are no longer sent to the micro base station. The first RLC status report received by the macro base station from the UE is also no longer sent to the micro base station.

[0644] In the prior art, the UE can inform the serving base station and, using the power headroom message (power headroom message, PHR), information about the difference between the nominal (nominal) maximum transmit power of the UE in each serving cell in the activated state and the estimated power transmission on UL-SCH, and can also report information about the difference between the nominal maximum transmit power of the UE in the primary serving cell (PCell) and the estimated transmit power on the UL-SCH and the physical control channel in uplink (physical uplink control channel, PUCCH). Thus, the serving base station can perform uplink power adjustment according to the PHR. In the case of an CA between base stations, if all cells aggregated by two base stations are configured with PUCCH and the UE is configured to send PUSCH and PUCCH on all aggregated cells, no suitable mechanism for implementing uplink power control of the two base stations available now.

[0645] FIG. 35 is a schematic flowchart of an uplink power adjustment method according to an embodiment of the present invention. The method of FIG. 35 is performed by the UE.

[0646] 3510: The UE generates an extended PHR, wherein the extended PHR includes first-type power headroom (power headroom, PH) information, and second-type PH information of the first type of the first cell of the first base station, and first-type PH information and PH information of the second type of the second cell of the second base station.

[0647] It should be noted that in the case of a CA between base stations, the first base station may be a primary base station, and the second base station may be a secondary base station; then the first cell may be PCell, and the second cell may be SCell. In addition, the first base station may be a secondary base station, and the second base station may be a primary base station; then the first cell may be SCell, and the second cell may be Pcell. An embodiment of the present invention does not limit this.

[0648] A PH may include a Type 1 PH (Type 1) and a Type 2 PH (Type 2). Type 1 PH can be equal to the maximum transmit power P _{CMAX, c} , configured by the UE in each serving cell in the activated state, minus its transmit power PUSCH, and can be expressed as equation (1):

[0649] Type 1 PH = P _{CMAX, c} - PUSCH transmit power (1)

[0650] A type 2 PH may be equal to the maximum transmit power P _{CMAX, c} configured in the serving cell, minus the transmit power of its PUCCH and the transmit power of its PUSCH, and may be expressed as equation (2):

[0651] PH type 2 = P _{CMAX, c} - transmit power PUCCH - transmit power PUSCH (2)

[0652] In an embodiment of the present invention, the first type PH information may include a Type 1 PH, and the second type PH information may include a Type 2 PH.

[0653] It should be noted that when the first cell has uplink resources, the PH information of the first type of the first cell may further include the maximum transmit power of the first cell. When the second cell has uplink resources, the PH information of the first type of the second cell may further include the maximum transmit power of the second cell.

[0654] The condition for triggering the PHR by the UE may include that the change in the loss in the downlink transmission path exceeds a predetermined threshold value, that the periodic PHR timer expires, that the change in the power control parameter (P-MPRc ) exceeds a predefined threshold value and so on.

[0655] 3520: The UE sends the extended PHR to the first base station, so that the first base station sends the extended PHR to the second base station, and the first base station and the second base station perform uplink power adjustment according to the extended PHR.

[0656] After generating the extended PHR, the UE may send the extended PHR to the first base station according to the uplink resources of the first cell.

[0657] The first base station may send the extended PHR to the second base station via the X2 interface; and after the first base station and the second base station receive the extended PHR, the first base station and the second base station can perform uplink power adjustment according to the extended PHR.

[0658] It should be noted that after sending the extended PHR, the UE may enable or re-enable the PHR prohibit timer (PHR prohibit timer); and the UE cannot send the extended PHR again when the PHR prohibit timer is running. The duration of the PHR prohibition timer is generally much longer than the delay of the X2 interface. Therefore, the first base station or the second base station for a long time does not receive the extended PHR sent by the UE or the PHR sent by the other base station within a short period of time, and there is no uncertainty problem when, for example, for the first base station or for the second base station, it is difficult to determine which of the extended PHR is the last.

[0659] In an embodiment of the present invention, the UE generates an extended PHR; due to the fact that the extended PHR includes PH information of the first cell of the first base station and PH information of the second cell of the second base station, after the UE sends the extended PHR to the first base station, and the first base station sends the extended PHR to the second base station, the first base station and the second base station are able to perform uplink power adjustment according to the extended PHR.

[0660] FIG. 36 is a schematic flowchart of an uplink power adjustment method according to an embodiment of the present invention. The method of FIG. 36 is performed using the base station.

[0661] 3610: the first base station receives the extended PHR from the UE, wherein the extended PHR includes first type PH information and second type PH information of the first cell of the first base station, and first type PH information and second type PH information of the second cells of the second base station.

[0662] It should be noted that in the case of CA between base stations, the first base station may be a primary base station, and the second base station may be a secondary base station. Then the first cell may be PCell, and the second cell may be SCell. In addition, the first base station may further be a secondary base station, and the second base station may be a primary base station. Then the first cell may be SCell, and the second cell may be Pcell, which is not limited in the embodiment of the present invention.

[0663] In an embodiment of the present invention, the first type PH information may include type 1 PH, and the second type PH information may include type 2 PH.

[0664] 3620: the first base station performs uplink power adjustment according to the extended PHR and sends the extended PHR to the second base station so that the second base station performs uplink power adjustment according to the extended PHR.

[0665] In an embodiment of the present invention, the first base station receives the extended PHR from the UE, and sends the extended PHR to the second base station; due to the fact that the extended PHR includes PH information of the first cell of the first base station and PH information of the second cell of the second base station, and the first base station and the second base station are able to perform uplink power adjustment according to the extended PHR.

[0666] One skilled in the art may know that, in combination with the examples described in the embodiments disclosed herein, the blocks and steps of the algorithm may be implemented using electronic equipment or using a combination of software and electronic equipment. Whether such functions are performed using hardware or software depends on the specific applications and conditions of the design constraint of the technical solution. A person skilled in the art may use various ways of implementing the described functions for each particular application, but it cannot be considered that the embodiment is outside the scope of the present invention.

[0667] A person skilled in the art can clearly understand that for the purpose of a convenient and brief description for the detailed operating procedure of the above system, device and unit, reference can be made to the corresponding procedure in the above embodiments of the method, and the details are not described again in this work.

[0668] In some embodiments provided herein, it should be understood that the disclosed system, device, and method may be embodied in other ways. For example, the described hardware embodiments are merely exemplary. For example, a part of a block is simply part of a logical function and may be another part in the actual implementation. For example, many blocks or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the displayed or discussed mutual relations or direct connections or communication connections can be implemented through some interfaces. Indirect relationships or communications between devices or units may be embodied in electronic, mechanical, or other forms.

[0669] Blocks described as separate parts may or may not be physically separate, and parts displayed as blocks may or may not be physical blocks, may be located in one place, or may be distributed across multiple network blocks. Part or all of the blocks can be selected according to the actual needs of achieving the goals of the solutions of the embodiments. In addition, the functional blocks in the embodiments of the present invention may be integrated into one processor, or each of the blocks may exist physically separately, or two or more blocks may be integrated into one block.

[0670] When the functions are embodied in the form of a software function module and are sold or used as an independent product, the functions may be stored on a computer-readable storage medium. Based on this understanding, the technical solutions of the present invention essentially, or a part that contributes to the prior art, or a part of technical solutions, can be embodied in the form of a software product. The computer program product is stored on a storage medium and includes several instructions for instructing a computer device (which may be a personal computer, server, or network device) to perform all or part of the steps of the methods described in embodiments of the present invention. The above storage medium includes: any media that can save the program code, such as USB flash memory, removable hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk. The above descriptions are merely specific embodiments of the present invention, but are not intended to limit the scope of protection of the present invention. Any variation or substitution easily calculated by a person skilled in the art within the scope of the present invention should be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should depend on the scope of protection of the claims.

Claims (42)

1. A method comprising the steps of: sending, using the first base station, a request to the second base station for configuring the second cell, said request containing configuration information of the DRB data radio channel, wherein the DRB configuration information contains an QoS parameter of enhanced radio access channel E-RAB and a DRB identifier, and the QoS parameter E-RAB is the QoS parameter after the split decision made by the first base station; receive, using the first base station, a response from the second base station, said response containing information about the resources of the second cell; sending, using the first base station, resource information of the second cell to the user equipment of the UE; receiving, using the first base station, an RRC connection reconfiguration completion message from the UE; sending, using the first base station, a configuration completion message to the second base station; and sharing, using the first base station, DRB data that was sent to the second base station. 2. The method according to claim 1, further comprising stages in which: receiving, using the first base station, a message sent from the second base station, wherein the message is used to indicate buffer size information for buffered divided data to be sent from the first base station to the second base station; or receiving, using the first base station, a capacity allocation indication message sent from the second base station, wherein said capacity indication message is used to indicate capacity information or a reserved buffer of the second base station; or receiving, using the first base station, a capacity correction indication message sent from the second base station, wherein said capacity correction indication message is used to indicate a message about capacity reduction or capacity increase. 3. The method of claim 1, wherein said request is further used to instruct the second base station to create an SRB signaling radio channel for the UE. 4. The method of claim 1, further comprising the step of: receive, using the first base station, an extended power headroom PHR message, the PHR comprising: power reserve PH type 1 and PH type 2 of the first cell of the first base station; and Type 1 PH of the second cell of the second base station. 5. The method of claim 4, further comprising the step of: performing, using the first base station, uplink power adjustment according to the PHR; and send, using the first base station, the PHR to the second base station. 6. The device of the first base station, containing: a processor configured for: dividing the data with respect to the data of the radio channel (DRB) to be sent to the second base station; transmitter configured for: sending a request to the second base station for configuring the second cell, said request containing DRB configuration information, the DRB configuration information comprising an enhanced radio access channel QoS QoS parameter and an DRB identifier, and the E-RAB QoS parameter is a QoS parameter after the separation decision made by the first base station; sending a configuration completion message to the second base station after receiving the RRC connection reconfiguration completion message; receiver configured for: receiving a response from a second base station, said response containing resource information of a second cell; wherein said transmitter is further configured for: sending information about the resources of the second cell to the user equipment UE, receiving an RRC connection reconfiguration completion message from the UE; and sending the divided data to the second base station. 7. The device according to claim 6, in which: the receiver is further configured to receive a message sent from the second base station, wherein said message is used to indicate buffer size information for buffered divided data to be sent from the first base station to the second base station; or the receiver is further configured to receive a capacity allocation indication message sent from the second base station, wherein said capacity indication message is used to indicate capacity information or a reserved buffer of the second base station; or the receiver is further configured to receive a capacity correction indication message sent from the second base station, wherein said capacity correction indication message is used to indicate a message about capacity reduction or capacity increase. 8. The apparatus of claim 6, wherein said request is further used to instruct the second base station to create an SRB signaling radio channel for the UE. 9. The device according to claim 6, in which the receiver is further configured to receive an extended power headroom PHR message, the PHR comprising: power reserve PH type 1 and PH type 2 of the first cell of the base station; and Type 1 PH of the second cell of the second base station. 10. The device according to p. 9, in which the processor is further configured to perform uplink power adjustment according to the PHR; and the transmitter is further configured to send the PHR to the second base station.

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