WO2014075210A1 - 传输数据的方法、基站和用户设备 - Google Patents
传输数据的方法、基站和用户设备 Download PDFInfo
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- WO2014075210A1 WO2014075210A1 PCT/CN2012/084506 CN2012084506W WO2014075210A1 WO 2014075210 A1 WO2014075210 A1 WO 2014075210A1 CN 2012084506 W CN2012084506 W CN 2012084506W WO 2014075210 A1 WO2014075210 A1 WO 2014075210A1
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- base station
- rlc
- rlc pdu
- downlink
- uplink
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H04W72/12—Wireless traffic scheduling
- H04W72/1221—Wireless traffic scheduling based on age of data to be sent
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- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/24—Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
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- H04W52/04—Transmission power control [TPC]
- H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
- H04W52/36—Transmission power control [TPC] using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
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- H04W72/27—Control channels or signalling for resource management between access points
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- H—ELECTRICITY
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- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
Definitions
- the present invention relates to the field of communications and, in particular, to a method of transmitting data, a base station, and a user equipment. Background technique
- the 3rd generation partnership project (the 3rd generation partnership)
- 3GPP 3rd generation partnership
- LTE-A 3rd Generation Partnership Project Advanced Term Evolution Advanced
- CA Carrier Aggregation
- the CA can obtain larger bandwidth by aggregating multiple consecutive or non-contiguous component carriers (CCs), thereby increasing the peak data rate and system throughput, and also solving the problem of carrier spectrum discontinuity.
- a user equipment (UE) can support multiple CC aggregations in the downlink and uplink, and the CCs can be in the same frequency band or different frequency bands.
- the CCs aggregated by the UE are provided by the same base station, for example, multiple CCs of the co-site provided by the base station or multiple CCs of the non-co-sites provided by the base station and its remote radio head (RRH), respectively.
- RRH remote radio head
- the existing LTE-A technology only supports the CA provided by the same base station, and the CA cannot be performed when the CCs of different base stations have a common coverage area. Therefore, the UEs in the area jointly covered by the CCs of different base stations need to switch during the mobile process. ) To a cell with better radio conditions, the handover process will cause service delay or interruption, reducing peak rate and throughput.
- the embodiments of the present invention provide a method for transmitting data, a base station, and a user equipment, which can improve the peak rate and throughput of the UE.
- a first aspect provides a method for transmitting data, including: a first base station generates a downlink radio link control RLC protocol data unit PDU; and the first base station sends a first partial downlink RLC PDU in the downlink RLC PDU to a user equipment UE. And transmitting the downlink RLC PDU to the second base station The second part of the downlink RLC PDU is sent by the second base station to the UE for the second partial downlink RLC PDU.
- the method further includes: receiving, by the first base station, a first partial uplink RLC PDU in the uplink RLC PDU generated by the UE from the UE, and receiving the uplink from the second base station A second partial uplink RLC PDU in the RLC PDU, wherein the second partial uplink RLC PDU is received by the second base station from the UE.
- the method further includes: the first base station receiving a first RLC status report from the UE; and the first RLC status report indicating that the first part of the downlink RLC PDU needs to be retransmitted
- the first base station retransmits the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU to the UE; the first base station forwards the first RLC status report to the second base station, the first RLC status
- the report indicates the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU, or the first base station sends a retransmission message generated by the first base station according to the first RLC state 4 to the second base station, and the retransmission is performed.
- the message indicates the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU.
- the method further includes: the first base station receiving a first RLC status report from the second base station, where the first RLC status report is that the second base station receives from the UE The first base station determines, according to the first RLC status report, the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU; the first base station retransmits the RLC that needs to be retransmitted in the first part of the downlink RLC PDU to the UE PDU.
- the method further includes: the first base station generating, according to the receiving condition of the first partial uplink RLC PDU and the second partial uplink RLC PDU a second RLC status report, and sending the second RLC status report to the UE; the first base station receives an RLC PDU of the uplink retransmission set determined by the UE according to the second RLC status report, where the uplink retransmission set includes the The RLC PDU that needs to be retransmitted in a part of the uplink RLC PDU and/or the RLC PDU that needs to be retransmitted in the second part of the uplink RLC PDU.
- the first base station receives, by the UE, the RLC PDU of the uplink retransmission set determined by the UE according to the second RLC status report, including: The first base station receives the RLC PDU of the uplink retransmission set from the UE; or the first base station receives the RLC PDU of the first uplink retransmission sub-set from the UE, and receives the second uplink retransmission from the second base station An RLC PDU in the set, where the RLC PDU of the second uplink retransmission sub-set is received by the second base station from the UE, the first uplink retransmission sub-collection and the The second uplink retransmission sub-set is obtained by the UE by dividing the uplink retransmission set; or, the first base station receives, from the second base station, the RLC PDU of the uplink retransmission set, and the RLC PDU of the
- the second aspect provides a method for transmitting data, including: receiving, by a second base station, a second partial downlink RLC PDU in a downlink radio link control RLC protocol data unit PDU generated by the first base station from the first base station; The second base station sends the second partial downlink RLC PDU to the user equipment UE.
- the method further includes: the second base station receiving, from the UE, a second partial uplink RLC PDU in the uplink RLC PDU generated by the UE; The base station transmits the second partial uplink RLC PDU.
- the method further includes: the second base station receiving, by the first base station, a first RLC status report, and determining, according to the first RLC status report, the second part of the downlink RLC PDU.
- the second base station receives the retransmission message from the first base station, and according to the retransmission message And retransmitting, to the UE, the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU, where the first retransmission message indicates the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU.
- the method further includes: the second base station receiving a first RLC status report from the UE; the second base station forwarding the first RLC status report to the first base station, When the first RLC status report indicates the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU, the first base station retransmits the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU to the UE; in the first RLC status report indication When the second part of the downlink RLC PDU needs to be retransmitted, the second base station retransmits the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU to the UE.
- the method further includes: the second base station receiving, by the UE, an RLC PDU of an uplink retransmission set, and transmitting the RLC PDU to the first base station Retransmitting the RLC PDU of the uplink, the uplink retransmission set includes the RLC PDU that needs to be retransmitted in the first part of the uplink RLC PDU and/or the RLC PDU that needs to be retransmitted in the second part of the uplink RLC PDU; or the second The base station receives the RLC PDU of the second uplink retransmission sub-set from the UE, and sends the RLC PDU of the second uplink retransmission sub-set to the first base station, where the second uplink re-transmission sub-set is that the UE is heavy on the uplink
- the collection is divided by the collection.
- a method for transmitting data including: receiving, by a user equipment, a first part of downlink RLC PDUs in a downlink radio link control RLC protocol data unit PDU generated by the first base station from a first base station, and The second base station receives the second partial downlink RLC PDU in the downlink RLC PDU, where the second partial downlink RLC PDU is received by the second base station from the first base station.
- the method further includes: the UE generating an uplink RLC PDU; the UE transmitting, by the first base station, the first part of the uplink RLC PDU in the uplink RLC PDU, and to the second base station Sending a second partial uplink RLC PDU in the uplink RLC PDU.
- the method further includes: the UE generating a first RLC status report according to the receiving status of the first part downlink RLC PDU and the second part downlink RLC PDU, the first RLC The status report indicates the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU and/or the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU; the UE sends the first to the first base station or the second base station
- the RLC status report the UE receives, from the first base station, the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU and/or receives the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU from the second base station.
- the method further includes: the UE receiving a second RLC status report from the first base station; the UE reporting according to the second RLC status, Determining an uplink retransmission set, where the uplink retransmission set includes an RLC PDU that needs to be retransmitted in the first partial uplink RLC PDU and/or an RLC PDU that needs to be retransmitted in the second partial uplink RLC PDU; the UE is to the first base station Sending the RLC PDU of the uplink retransmission set, or sending the RLC PDU of the uplink retransmission set to the second base station, or sending the RLC PDU of the first uplink retransmission subset to the first base station and sending the RLC PDU to the second base station
- the RLC PDU of the second uplink retransmission sub-set, where the first uplink retransmission sub-set and the second uplink re-transmission sub-set are obtained by
- a base station including: a generating unit, configured to generate a downlink radio link control RLC protocol data unit PDU, and a sending unit, configured to send, to the user equipment UE, the first part of the downlink RLC PDU in the downlink RLC PDU And transmitting, to the second base station, the second part of the downlink RLC PDU in the downlink RLC PDU, so that the second part of the downlink RLC PDU is sent by the second base station to the UE.
- a generating unit configured to generate a downlink radio link control RLC protocol data unit PDU
- a sending unit configured to send, to the user equipment UE, the first part of the downlink RLC PDU in the downlink RLC PDU And transmitting, to the second base station, the second part of the downlink RLC PDU in the downlink RLC PDU, so that the second part of the downlink RLC PDU is sent by the second base station to the UE.
- the method further includes: a first receiving unit, configured to receive, from the UE, a first part of the uplink RLC PDU in the uplink RLC PDU generated by the UE, And receiving, from the second base station, a second partial uplink RLC PDU in the uplink RLC PDU, where the second partial uplink RLC PDU is received by the second base station from the UE.
- the second receiving unit is further configured to receive a first RLC status report from the UE, where the sending unit is further configured to When the RLC status report indicates the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU, retransmit the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU to the UE; the sending unit is further used to send the second The base station forwards the first RLC status report, where the first RLC status report indicates the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU, or sends the second base station to generate, according to the first RLC status report, the first base station generates Retransmitting the message, the retransmission message indicating the RLC PDU in the second part of the downlink RLC PDU that needs to be retransmitted.
- the third receiving unit and the first determining unit the third receiving unit is configured to receive, by the second base station, a first RLC status report, where the An RLC status report is received by the second base station from the UE; the first determining unit is configured to determine, according to the first RLC status report, an RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU; the sending unit, The RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU is also retransmitted to the UE.
- the method further includes a fourth receiving unit, where the generating unit is further configured to use the first partial uplink RLC PDU and the second partial uplink RLC a receiving status of the PDU, generating a second RLC status report, the sending unit is further configured to send the second RLC status report to the UE; the fourth receiving unit is further configured to receive, by the UE, the second RLC status report.
- the uplink retransmission set includes an RLC PDU that needs to be retransmitted in the first part of the uplink RLC PDU and/or an RLC PDU that needs to be retransmitted in the second part of the uplink RLC PDU.
- the fourth receiving unit is specifically configured to receive, by the UE, an RLC PDU of the uplink retransmission set; or receive the first Retransmitting the RLC PDU of the sub-set and receiving, from the second base station, the RLC PDU in the second uplink retransmission sub-set, where the RLC PDU of the second uplink re-transmission sub-set is received by the second base station from the UE
- the first uplink retransmission sub-set and the second uplink retransmission sub-set are obtained by the UE to the uplink retransmission set; or the RLC PDU of the upload retransmission set is received from the second base station, where The RLC PDU of the uplink retransmission set is received by the second base station from the UE.
- a base station including: a receiving unit, configured to receive, from a first base station, a second partial downlink RLC PDU in a downlink radio link control RLC protocol data unit PDU generated by the first base station; And configured to send the second partial downlink RLC PDU to the user equipment UE.
- the receiving unit is further configured to receive, by the UE, a second partial uplink RLC PDU in the uplink RLC PDU generated by the UE, where the sending unit is further configured to A base station transmits the second partial uplink RLC PDU.
- the method further includes a first determining unit, where the receiving unit is further configured to receive a first RLC status report from the first base station, where the first determining unit is configured to use, according to the first An RLC status report determines an RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU, and the sending unit is further configured to retransmit the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU to the UE; or, the receiving The unit is further configured to receive a retransmission message from the first base station, where the sending unit is further configured to retransmit the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU according to the retransmission message, where the first weight The message indicates the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU.
- the receiving unit is further configured to use the
- the UE receives the first RLC status report; the sending unit is further configured to forward the first RLC status report to the first base station, when the first RLC status report indicates the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU, The first base station retransmits the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU to the UE; the sending unit is further configured to: when the first RLC status report indicates the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU, Retransmitting the RLC PDU that needs to be retransmitted in the second partial downlink RLC PDU to the UE.
- the receiving unit is further configured to receive an RLC PDU of an uplink retransmission set from the UE, where the sending unit is further used to Sending, by the base station, the RLC PDU of the uplink retransmission set, where the uplink retransmission set includes an RLC PDU that needs to be retransmitted in the first part of the uplink RLC PDU and/or an RLC PDU that needs to be retransmitted in the second part of the uplink RLC PDU; or The receiving unit is further configured to receive, by the UE, an RLC PDU of the second uplink retransmission sub-set, where the sending unit is further configured to send, to the first base station, the RLC PDU of the second uplink retransmission sub-set, the second uplink The retransmission sub-collection is obtained by the UE dividing the uplink retransmission set.
- a user equipment including: a receiving unit, configured to receive, from a first base station, a first part of a downlink radio link control RLC protocol data unit PDU generated by the first base station Dividing a downlink RLC PDU, and receiving, from the second base station, a second partial downlink RLC PDU in the downlink RLC PDU, where the second partial downlink RLC PDU is received by the second base station from the first base station; And configured to reassemble the first partial downlink RLC PDU and the second partial downlink RLC PDU to form a downlink RLC service data unit SDU.
- a receiving unit configured to receive, from a first base station, a first part of a downlink radio link control RLC protocol data unit PDU generated by the first base station Dividing a downlink RLC PDU, and receiving, from the second base station, a second partial downlink RLC PDU in the downlink RLC PDU, where the second partial downlink RLC PDU is received by the second base station from the first base station;
- the method further includes: a first sending unit; the first generating unit is further configured to generate an uplink RLC PDU; the first sending unit is configured to send the uplink RLC to the first base station The first part of the PDU uplinks the RLC PDU and sends the second part of the uplink RLC PDU of the uplink RLC PDU to the second base station.
- the second generating unit and the second sending unit are further configured to use, according to the first partial downlink RLC PDU and the second partial downlink RLC PDU.
- Receiving a first RLC status report the first RLC status report indicating an RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU and/or an RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU;
- a second sending unit configured to send the first RLC status report to the first base station or the second base station;
- the receiving unit is further configured to receive, from the first base station, an RLC PDU that needs to be retransmitted in the first partial downlink RLC PDU. And/or receiving, from the second base station, an RLC PDU that needs to be retransmitted in the second partial downlink RLC PDU.
- the method further includes a determining unit and a third sending unit, where the receiving unit is further configured to receive the second RLC status report from the first base station.
- the determining unit is configured to determine, according to the second RLC status report, an uplink retransmission set, where the uplink retransmission set includes an RLC PDU that needs to be retransmitted in the first part of the uplink RLC PDU and/or the second part of the uplink RLC PDU.
- the RLC PDU that needs to be retransmitted; the third sending unit is configured to send the RLC PDU of the uplink retransmission set to the first base station, or send the RLC PDU of the uplink retransmission set to the second base station, or to the first
- the base station sends the RLC PDU of the first uplink retransmission sub-set and sends the RLC PDU of the second uplink retransmission sub-set to the second base station, where the first uplink retransmission sub-set and the second uplink re-transmission sub-set are the UE pair
- the uplink retransmission set is divided.
- a base station including: a processor, configured to generate a downlink radio link control RLC protocol data unit PDU, and a transmitter, configured to send, to the user equipment UE, the first part of the downlink RLC PDU in the downlink RLC PDU And transmitting, to the second base station, a second part of the downlink RLC PDU in the downlink RLC PDU, so that the second part of the downlink RLC PDU is sent by the second base station to the UE.
- a processor configured to generate a downlink radio link control RLC protocol data unit PDU
- a transmitter configured to send, to the user equipment UE, the first part of the downlink RLC PDU in the downlink RLC PDU And transmitting, to the second base station, a second part of the downlink RLC PDU in the downlink RLC PDU, so that the second part of the downlink RLC PDU is sent by the second base station to the UE.
- the method further includes: a receiver, configured to receive, from the UE, a first partial uplink RLC PDU in the uplink RLC PDU generated by the UE, and receive the second RLC PDU from the second base station A second partial uplink RLC PDU in the uplink RLC PDU, wherein the second partial uplink RLC PDU is received by the second base station from the UE.
- a receiver is further included, a receiver is configured to receive a first RLC status report from the UE, and a transmitter is further configured to indicate the status in the first RLC status report.
- the transmitter is further configured to forward the first RLC status to the second base station.
- the first RLC status report indicates an RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU, or sends a retransmission message generated by the base station according to the first RLC status 4 to the second base station, the weight The message indicates the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU.
- the method further includes: a receiver, configured to receive a first RLC status report from the second base station, where the first RLC status report is the second base station
- the processor is further configured to: determine, according to the first RLC status report, the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU; the transmitter is further configured to retransmit the first part of the downlink RLC to the UE The RLC PDU that needs to be retransmitted in the PDU.
- the processor is further configured to generate, according to the receiving condition of the first partial uplink RLC PDU and the second partial uplink RLC PDU a second RLC status report, the transmitter is further configured to send the second RLC status report to the UE, and the receiver is further configured to receive an RLC PDU of the uplink retransmission set determined by the UE according to the second RLC status report, where the uplink weight is The transmission set includes RLC PDUs that need to be retransmitted in the first partial uplink RLC PDU and/or RLC PDUs that need to be retransmitted in the second partial uplink RLC PDU.
- the receiver is specifically configured to receive the RLC PDU of the uplink retransmission set from the UE, or receive the first uplink weight from the UE And transmitting, by the second base station, the RLC PDU in the second uplink retransmission subset, where the RLC PDU of the second uplink retransmission subset is received by the second base station from the UE, where The first uplink retransmission sub-set and the second uplink retransmission sub-set are obtained by the UE to the uplink retransmission set; or the RLC PDU of the upload retransmission set is received from the second base station, the uplink retransmission The aggregated RLC PDU is received by the second base station from the UE.
- a base station including: a receiver, configured to receive, from a first base station, a second partial downlink RLC PDU in a downlink radio link control RLC protocol data unit PDU generated by the first base station; And transmitting the second part of the downlink RLC PDIL to the user equipment UE.
- the receiver is further configured to receive, by the UE, the second part of the uplink RLC PDU generated by the UE.
- An uplink RLC PDU; the transmitter is further configured to send the second partial uplink RLC PDU to the first base station.
- the method further includes: a processor; the receiver is further configured to receive a first RLC status report from the first base station, where the processor is configured to determine, according to the first RLC status report, the first The RLC PDU that needs to be retransmitted in the two-part downlink RLC PDU, the transmitter is further configured to retransmit the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU to the UE; or, the receiver is further used from the first base station Receiving a retransmission message, the transmitter is further configured to retransmit the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU according to the retransmission message, where the first retransmission message indicates the second part of the downlink RLC PDU The RLC PDU that needs to be retransmitted.
- the receiver is further configured to receive the first RLC status report from the UE, and the transmitter is further configured to forward the first RLC status report to the first base station, where When the first RLC status report indicates the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU, the first base station retransmits the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU to the UE; When the first RLC status indicates the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU, the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU is retransmitted to the UE.
- the receiver is further configured to receive, by the UE, an RLC PDU of an uplink retransmission set, where the transmitter is further configured to use the first base station Transmitting, by the uplink retransmission set, an RLC PDU, where the uplink retransmission set includes an RLC PDU that needs to be retransmitted in the first partial uplink RLC PDU and/or an RLC PDU that needs to be retransmitted in the second partial uplink RLC PDU; or, receiving The device is further configured to receive, by the UE, an RLC PDU of the second uplink retransmission sub-set, and the transmitter is further configured to send, to the first base station, the RLC PDU of the second uplink retransmission sub-set, the second uplink re-transmission sub-collection It is obtained by the UE dividing the uplink retransmission set.
- a ninth aspect provides a user equipment, including: a receiver, configured to receive, from a first base station, a first part of downlink RLC PDUs in a downlink radio link control RLC protocol data unit PDU generated by the first base station, and Receiving, by the second base station, a second part of the downlink RLC PDU in the downlink RLC PDU, where the second part of the downlink RLC PDU is received by the second base station from the first base station;
- the processor is configured to reassemble the first partial downlink RLC PDU and the second partial downlink RLC PDU to form a downlink RLC service data unit SDU.
- a transmitter is further included, a processor is further configured to generate an uplink RLC PDU, and a transmitter is configured to send, to the first base station, the first part of the uplink RLC PDU. An RLC PDU, and transmitting a second partial uplink RLC PDU in the uplink RLC PDU to the second base station.
- the method further includes: a processor, configured to generate a first RLC state according to the receiving status of the first partial downlink RLC PDU and the second partial downlink RLC PDU Reporting, the first RLC status report indicates an RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU and/or an RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU; and a transmitter, configured to send to the first base station Or the second base station sends the first RLC status report; the receiver is further configured to receive, from the first base station, an RLC PDU that needs to be retransmitted in the first partial downlink RLC PDU and/or receive the first from the second base station The RLC PDU that needs to be retransmitted in the two-part downlink RLC PDU.
- a processor configured to generate a first RLC state according to the receiving status of the first partial downlink RLC PDU and the second partial downlink RLC PDU Reporting, the first RLC status
- the receiver is further configured to receive a second RLC status report from the first base station
- the processor is further configured to: a second RLC status report, determining an uplink retransmission set, where the uplink retransmission set includes an RLC PDU that needs to be retransmitted in the first part of the uplink RLC PDU and/or an RLC PDU that needs to be retransmitted in the second part of the uplink RLC PDU; And sending, to the first base station, the RLC PDU of the uplink retransmission set, or sending the RLC PDU of the uplink retransmission set to the second base station, or sending the first uplink retransmission subset to the first base station And the RLC PDU of the second uplink retransmission sub-set is sent to the second base station, where the first uplink retransmission sub-set and the second uplink re-transmission sub-set are that the UE divides the uplink
- the first base station sends the first part of the downlink RLC PDU in the downlink RLC PDU to the UE, and sends the second part of the downlink RLC PDU in the downlink RLC PDU to the second base station, where the second base station sends the second RLC PDU to the UE.
- the two-part downlink RLC PDU enables the first base station and the second base station to jointly transmit data to the UE, thereby improving the peak rate and throughput of the UE.
- FIG. 1a is a schematic diagram of an example of a scenario in which an embodiment of the present invention is applicable.
- Figure lb is a schematic illustration of another example of a scenario in which embodiments of the present invention may be applied.
- Figure lc is a schematic diagram of another example of a scenario in which embodiments of the present invention may be applied.
- Figure Id is a schematic illustration of another example of a scenario in which embodiments of the present invention may be applied.
- 2a is a schematic flow chart of a method of transmitting data according to an embodiment of the present invention.
- 2b is a schematic flow chart of a method of transmitting data according to an embodiment of the present invention.
- FIG. 3 is a schematic flowchart of a method of transmitting data according to an embodiment of the present invention.
- FIG. 4 is a schematic flow chart of a method of transmitting data according to an embodiment of the present invention.
- FIG. 5 is a schematic diagram of a data transmission process according to an embodiment of the present invention.
- FIG. 6 is a schematic flowchart of a data offload configuration process according to an embodiment of the present invention.
- FIG. 7 is a schematic diagram of a data transmission process according to an embodiment of the present invention.
- FIG. 8 is a schematic flowchart of a configuration process of data offloading according to an embodiment of the present invention.
- 9 is a schematic diagram of an example of a control plane protocol stack in accordance with an embodiment of the present invention.
- FIG. 10 is a schematic diagram of an example of a user plane protocol stack in accordance with an embodiment of the present invention.
- FIG. 11 is a schematic structural diagram of layer 2 in a protocol stack of a macro base station according to an embodiment of the present invention.
- FIG. 12 is a schematic structural diagram of layer 2 in a protocol stack of a micro base station according to an embodiment of the present invention.
- FIG. 13 is a schematic structural diagram of layer 2 in a protocol stack of a UE according to an embodiment of the present invention.
- FIG. 14 is a schematic flow chart of a process of a method of transmitting data according to an embodiment of the present invention.
- FIG. 15 is a schematic flowchart of a downlink data retransmission process according to an embodiment of the present invention.
- FIG. 16 is a schematic flowchart of a downlink data retransmission process according to an embodiment of the present invention.
- FIG. 17 is a schematic flowchart of a process of a method of transmitting data according to an embodiment of the present invention.
- FIG. 18 is a schematic flowchart of an uplink data retransmission process according to an embodiment of the present invention.
- FIG. 19 is a schematic flowchart of an uplink data retransmission process according to an embodiment of the present invention.
- FIG. 20 is a schematic flowchart of an uplink data retransmission process according to an embodiment of the present invention.
- FIG. 21 is a schematic flowchart of a process of RRC connection re-establishment according to an embodiment of the present invention.
- Figure 22 is a schematic block diagram of a base station in accordance with an embodiment of the present invention.
- FIG. 23 is a schematic block diagram of a base station in accordance with an embodiment of the present invention.
- Figure 24 is a schematic block diagram of a UE in accordance with an embodiment of the present invention.
- Figure 25 is a schematic block diagram of a base station in accordance with an embodiment of the present invention.
- Figure 26 is a schematic block diagram of a base station in accordance with an embodiment of the present invention.
- Figure 27 is a schematic block diagram of a UE in accordance with an embodiment of the present invention.
- FIG. 28 is a schematic block diagram of a base station in accordance with an embodiment of the present invention.
- 29 is a schematic block diagram of a base station in accordance with an embodiment of the present invention.
- Figure 30 is a schematic block diagram of a UE in accordance with an embodiment of the present invention.
- FIG. 31 is a schematic flowchart of a method for cell resource management according to an embodiment of the present invention.
- FIG. 32 is a schematic flowchart of a method for cell resource management according to an embodiment of the present invention.
- FIG. 33 is a schematic flowchart of a method for cell resource management according to an embodiment of the present invention.
- FIG. 34 is a schematic flowchart of a method for cell resource management according to an embodiment of the present invention.
- FIG. 35 is a schematic flowchart of an uplink power control method according to an embodiment of the present invention.
- FIG. 36 is a schematic flowchart of an uplink power control method according to an embodiment of the present invention. detailed description
- FIG. 1a is a schematic diagram of an example of a scenario in which an embodiment of the present invention is applicable.
- Figure la can be a scenario for the LTE-A system.
- a macro base station (Mact eNB (eNodeB)) 110a may have CC1 with a frequency of fl
- a pico eNB 120a may have CC2 with a frequency of f2
- a coverage area of CC2 may be located in a coverage area of CC1.
- the UE 130a may be in an area covered by CC2, that is, in a common coverage area of CC 1 and CC2.
- the macro base station 110a and the micro base station 120a can jointly transmit data with the UE 130a, so that the UE 130a does not need to switch between the macro base station 110a and the micro base station 120a. .
- CC1 may be used as the primary CC (Primary CC, PCC) and CC2 as the secondary CC when performing aggregation of CC1 and CC2.
- PCC Primary CC
- SCC Secondary CC
- PCC can be used for mobility management, and SCC can provide traffic distribution. Since the macro base station has a wide coverage, it can be used for mobility management as a PCC to reduce the occurrence of handover.
- CC2 may be used as the PCC and CC1 as the SCC.
- Figure lb is a schematic illustration of another example of a scenario in which embodiments of the present invention may be applied.
- Figure lb can be another scenario for the LTE-A system.
- macro base station 110b may have CC1 with frequency fl
- micro base station 120b may have CC2 with frequency f2.
- CC1 and CC2 There is a common coverage area between CC1 and CC2.
- UE 130b may be located in a common coverage area of CC1 and CC2.
- the macro base station 110b and the micro base station 110b can also jointly transmit data with the UE 130b, and the UE 130b does not need to be in the macro base station 110b and the micro base station 110b. Switch between.
- Figure 1c is a schematic illustration of another example of a scenario in which embodiments of the present invention may be applied.
- Figure lc can be another scenario of the LTE-A system.
- the micro base station 110c may have CC1 of frequency fl
- the micro base station 120c may have CC2 of frequency f2.
- the coverage area of CC2 can be located in the coverage area of CC1.
- the UE 130c may be in an area covered by CC2, that is, in a common coverage area of CC1 and CC2.
- the micro base station 110c and the micro base station 110c can also jointly transmit data with the UE 130c, and the UE 130c does not need to be in the micro base station 110c and the micro base station 110c. Switch between.
- Figure Id is a schematic illustration of another example of a scenario in which embodiments of the present invention may be applied.
- Figure Id can be another scenario for the LTE-A system.
- the micro base station 110d may have CC1 of frequency fl, and the micro base station 120d may have CC2 of frequency f2.
- the UE 130d may be located in a common coverage area of CC1 and CC2.
- the micro base station 110d and the micro base station 110d can also jointly transmit data with the UE 130d, and the UE 130d does not need to be in the micro base station 110d and the micro base station 110d. Switch between.
- FIG. 1D describes a scenario of two micro base stations
- the embodiment of the present invention may also A scenario applied to two macro base stations, that is, a scenario in which a common coverage area exists between two macro base stations.
- the other processes are similar to those described in FIG. 1D. To avoid repetition, details are not described herein.
- the embodiment of the present invention may also be applied to two base stations or more than two base stations respectively having multiple CCs, and multiple CCs have a common coverage area.
- multiple CC frequencies of two base stations are different or have frequency overlap.
- the two base stations respectively provide two carriers with the frequency of fl and f2, and the fl and f2 carriers of the two base stations have a common coverage area, and the UE can aggregate the fl of the first base station and the f2 of the second base station to perform CA, or aggregate.
- the f2 of the first base station and the fl of the second base station perform CA.
- the UE may aggregate the fl of the first base station and the fl of the second base station to perform CA. This situation may also be referred to as coordinated multi-point (CoMP) transmission/reception, the first base station and the second base station. Communicate with the UE by means of cooperative scheduling. This embodiment of the present invention does not limit this.
- FIG. 2a is a schematic flow chart of a method of transmitting data according to an embodiment of the present invention. The method of Figure 2a is performed by a first base station.
- the first base station generates a downlink radio link control (RLC) protocol data unit (PDU).
- RLC radio link control
- PDU protocol data unit
- the first base station sends a first part of the downlink RLC PDU in the downlink RLC PDU to the user equipment (UE), and sends the second part of the downlink RLC PDU in the downlink RLC PDU to the second base station, so as to be sent by the second base station to the second base station.
- the UE sends a second partial downlink RLC PDU.
- the first base station may serve as a user plane anchor point, and is responsible for offloading downlink data.
- the first base station may be one of the macro base station 110a and the micro base station 120a in FIG. Can be another one.
- the first base station may also be one of the macro base station 110a and the micro base station 120a in Figure lb, and the second base station may be another.
- 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 another one.
- the first base station may also be one of the micro base station 110d and the micro base station 120d in Fig. Id, and the second base station may be another one.
- the UE may also be referred to as a Mobile Terminal (MT), a mobile user equipment, etc., such as a mobile telephone (or "cellular" telephone) and a computer having a mobile terminal.
- MT Mobile Terminal
- a mobile user equipment such as a mobile telephone (or "cellular" telephone)
- the first base station can serve as a user plane anchor point, and its Packet Data Convergence Protocol (PDCP) layer receives Internet Protocol (IP) data from the Serving Gateway (SGW) from the application layer.
- IP Internet Protocol
- SGW Serving Gateway
- the packet as a PDCP service data unit (SDU), is processed by the PDCP protocol layer to generate PDCP.
- the PDU is submitted to the RLC layer as an RLC SDU.
- the first base station may be configured to separate the first partial downlink RLC PDU and the second partial downlink RLC PDU from the generated downlink RLC PDU after generating the downlink RLC PDU according to the RLC SDU.
- the first base station may further divide the RLC SDU into a first partial RLC SDU and a second partial RLC SDU, and after generating the downlink RLC PDU, use the RLC PDU corresponding to the first partial RLC SDU in the downlink RLC PDU as the first partial downlink RLC.
- the PDU, the RLC PDU corresponding to the second partial RLC SDU is used as the second partial downlink RLC PDU.
- first partial downlink RLC PDU may include one or more RLC PDUs
- second partial downlink RLC PDU may also include one or more RLC PDUs.
- the first base station sends the first part of the downlink RLC PDU to the UE, which may be that the first base station performs the protocol layer processing on the first part of the downlink RLC PDU, and then sends the message to the UE.
- the first base station may access the first part of the downlink RLC PDU through the medium.
- the Medium Access Control (MAC) layer and the Physical (PHY) layer are processed and sent to the UE.
- the second base station sends the second part of the downlink RLC PDU to the UE, which may be that the second base station performs the processing of each protocol layer on the second part of the downlink RLC PDU, and then sends the message to the UE.
- the second base station may perform the second part of the downlink RLC.
- the PDU is processed and sent to the UE through the MAC layer and the PHY layer.
- the first base station sends the first part of the downlink RLC PDU in the downlink RLC PDU to the UE, and sends the second part of the downlink RLC PDU in the downlink RLC PDU to the second base station, where the second base station sends the second RLC PDU to the UE.
- the two-part downlink RLC PDU enables the first base station and the second base station to jointly transmit data to the UE, thereby improving the peak rate and throughput of the UE.
- the UE does not need to switch between the two base stations, so that service delay or interruption due to handover can also be avoided.
- the first base station may receive, from the UE, a first partial uplink RLC PDU in the uplink RLC PDU generated by the UE, and receive, from the second base station, a second partial uplink RLC PDU in the uplink RLC PDU, where the first The two-part uplink RLC PDU is received by the second base station from the UE.
- first partial uplink RLC PDU may include one or more RLC PDUs
- second partial uplink RLC PDU may also include one or more RLC PDUs.
- the first base station may receive the first partial uplink RLC PDU from the UE, and receive the second partial uplink RLC PDU sent by the UE to the second base station from the second base station, where the first base station may reassemble the two parts of the uplink RLC PDU.
- the first base station receives the first part of the uplink RLC PDU from the UE, which may be that the first base station receives the first part of the uplink data packet from the UE, and the first part of the uplink data packet is processed by each protocol layer to obtain the first part of the uplink RLC PDU, for example.
- the first base station may process the first partial uplink data packet through the PHY layer and the MAC layer to obtain the first partial uplink RLC PDU.
- the process for the second base station to receive the second part of the uplink RLC PDU from the UE is similar to that of the first base station. To avoid repetition, details are not described herein.
- the first base station may receive the first RLC status report from the UE.
- the first base station may retransmit the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU to the UE.
- the first base station may forward the first RLC status report to the second base station, where the first RLC status report may be used to indicate the RLC PDU in the second part of the downlink RLC PDU that needs to be retransmitted, or the first base station may send the first to the second base station.
- the base station reports the generated retransmission message according to the first RLC status, and the retransmission message may indicate the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU.
- the first base station updates the RLC AM transmission window and the corresponding state variable to continue transmitting the new RLC PDU.
- the UE may generate a first RLC status report according to the received status of the first partial downlink RLC PDU and the second partial downlink RLC PDU.
- the first base station may determine, according to the first RLC status report, whether there is an RLC PDU that needs to be retransmitted in the first partial downlink RLC PDU and the second partial downlink RLC PDU.
- the first base station may retransmit the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU to the UE.
- the first base station needs to notify the second base station of the RLC PDIL that needs to be retransmitted in the second part of the downlink RLC PDU.
- the first base station can forward to the second base station.
- the first RLC status report or the first base station may generate a retransmission message according to the first RLC status report, and indicate, by using the retransmission message, the RLC PDU in the second part of the downlink RLC PDU that needs to be retransmitted.
- the RLC status report and the RLC PDU retransmission related content are only applicable to the RLC AM; the process of RLC PDU generation, transmission, and reception applies to both the RLC AM and the RLC unacknowledged mode (Unacknowledged Mode) , UM).
- the first base station may determine, according to the first RLC status report, a downlink RLC PDU retransmission set, where the downlink RLC PDU retransmission set may include a retransmission in the first partial downlink RLC PDU.
- the first base station may divide the downlink RLC PDU retransmission set into a first downlink retransmission sub-set and a second downlink retransmission sub-set.
- the first base station may retransmit the RLC PDIL of the first downlink retransmission subset to the UE.
- the first base station may generate a second retransmission message and send a second retransmission message to the second base station, where the second retransmission message may indicate the second Downstream retransmission sub-collection.
- the first base station since the first base station is responsible for the transmission of the first partial downlink RLC PDU, the second base station does not have the part of the RLC PDU. Therefore, the first base station also needs to send these RLC PDUs to the second base station.
- the first base station can re-divide the RLC PDUs that need to be retransmitted, and determine that one part is responsible for retransmission by the first base station, and the other part is responsible for retransmission by the second base station.
- This can adapt to the real-time radio resources of the first base station and the second base station and meet the quality of service (QoS) requirements of the service, thereby improving the retransmission efficiency.
- QoS quality of service
- the first base station may receive the first RLC status report from the second base station, where 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, an RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU.
- the first base station may retransmit the RLC PDIL that needs to be retransmitted in the first part of the downlink RLC PDU to the UE.
- the first base station updates the RLC AM transmission window and the corresponding state variable to continue transmitting the new RLC PDU.
- the first base station needs to receive the first RLC status report forwarded by the second base station, when the first RLC status report is sent by the second base station.
- the UE may send the first RLC status report to the second base station, and the second base station forwards the report to the first base station.
- the first base station may retransmit the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU to the UE according to the first RLC status report.
- the first base station may generate the second RLC status according to the receiving status of the first partial uplink RLC PDU and the second partial uplink RLC PDU. Reporting and sending a second RLC status report to the UE.
- the first base station may receive the RLC PDU of the uplink retransmission set determined by the UE according to the second RLC status report, where the uplink retransmission set may include the RLC PDU and/or the second partial uplink RLC PDU in the first partial uplink RLC PDU that needs to be retransmitted.
- the RLC PDU that needs to be retransmitted may be generated the second RLC status according to the receiving status of the first partial uplink RLC PDU and the second partial uplink RLC PDU.
- the first base station may generate a second RLC status report according to the receiving status of the first partial uplink RLC PDU and the second partial uplink RLC PDU, and send the second to the second base station.
- the RLC status report is such that the second base station forwards the second RLC status report to the UE.
- the first base station may receive the RLC PDU of the uplink retransmission set determined by the UE according to the second RLC status report, where the uplink retransmission set may include the RLC PDU and/or the second partial uplink RLC PDU in the first partial uplink RLC PDU that needs to be retransmitted.
- the RLC PDU that needs to be retransmitted may be generated a second RLC status report according to the receiving status of the first partial uplink RLC PDU and the second partial uplink RLC PDU, and send the second to the second base station.
- the RLC status report is such that the second base station forwards the second RLC status report to the UE.
- the first base station may
- forwarding the second RLC status report to the UE by using the second base station can improve the reliability of the second RLC status report transmission.
- the first base station may receive the RLC PDU of the uplink retransmission set from the UE.
- the first base station may receive the RLC PDU of the first uplink retransmission sub-set from the UE, and receive the RLC PDU in the second uplink retransmission sub-set from the second base station, where the second uplink re-transmission sub-set is the second base station.
- the first uplink retransmission sub-set and the second uplink re-transmission sub-set received by the UE are obtained by the UE dividing the uplink retransmission set.
- the first base station may receive the RLC PDU of the uplink retransmission set from the second base station, and the RLC PDU of the uplink retransmission set is received by the second base station from the UE.
- the first base station may generate a second RLC status report according to the receiving status of the first part of the uplink RLC PDU and the second part of the uplink RLC PDU, and send the second RLC status report to the UE.
- the UE may determine, according to the second RLC status report, the RLC PDU that needs to be retransmitted, that is, determine the uplink retransmission set.
- the first base station may receive, from the UE, all the uplink RLC PDUs that need to be retransmitted, that is, the RLC PDIL of the uplink retransmission set, or the first base station may receive, from the UE, a part of the uplink RLC PDU that needs to be retransmitted, that is, the first uplink retransmission sub-collection
- the second base station of the RLC PDIL may receive another part of the uplink RLC PDU that needs to be retransmitted from the UE, and then send the part of the uplink RLC PDU to the first base station, that is, the RLC PDIL of the second uplink retransmission subset or the second base station may
- the UE receives all the uplink RLC PDUs that need to be retransmitted, that is, the RLC PDUs of the uplink retransmission set, and then sends the RLC PDUs to the first base. Station.
- the first base station may be located on the first cell of the first base station.
- the UE sends the first part of the downlink RLC PDU, and sends the second part of the downlink RLC PDU to the second base station, so that the second base station sends the second part of the downlink RLC PDU to the UE on the second cell of the second base station, where the first cell and the first cell The coverage of the second cell overlaps.
- the first base station has a first cell
- the second base station has a second cell
- the UE can be located in an area where the coverage of the first cell and the second cell overlap, so the carrier and the second base station
- the first base station may send the first partial downlink RLC PDU to the UE by using the first cell.
- the second base station may send the second partial downlink RLC PDU to the UE through the second cell.
- the first base station may send a first request message to the second base station, where the first request message may be used to indicate that the second base station configures the second cell for the UE.
- the first base station may receive a first response message from the second base station, where the first response message carries resource information of the second cell determined by the second base station according to the first request message, such as radio resource configuration common information and radio resource configuration of the second cell. Dedicated information.
- the first base station may send an RRC connection reconfiguration (RRCConnectionReconfiguration) message to the UE, where the RRC connection reconfiguration message carries the resource information of the second cell.
- the first base station may be a macro base station.
- the first base station may determine to increase the cell according to the measurement report of the UE or the measurement result of the Sounding Reference Signal (SRS), and the measurement report of the UE may include the reference signal received power of the current serving cell and the neighboring cell ( Reference Signal Received Power, RSRP) measurement results.
- the first base station may further determine, according to other measurement results, an increased cell, such as a Channel Quality Indication (CQI) reported by the UE.
- CQI Channel Quality Indication
- the first base station may indicate to the second base station that the second cell of the second base station is configured for the UE.
- the first base station may notify the UE of the resource information of the second cell by using an RRC connection reconfiguration message.
- the UE may perform RRC connection reconfiguration according to the resource information of the second cell.
- the first cell of the first base station may have an RRC connection and a Data Radio Bearer (DRB) between the UE and the UE.
- DRB Data Radio Bearer
- the first request message may be further used to indicate that the second base station establishes a DRB for the UE.
- the first base station can be based on the QoS parameters, traffic, throughput, and peak speed of the DRB. Rate information, etc., to determine whether the second base station is required to establish a DRB for the UE.
- the first base station may carry the DRB configuration information in the first request message, and the second base station may establish the RLC entity and the logical channel (LCH) corresponding to the DRB according to the DRB configuration information.
- the DRB configuration information may include at least one of the following: an Evolved Radio Access Bearer (E-RAB) identifier, an E-RAB Quality of Service (QoS) parameter, a DRB identifier, and an RLC configuration.
- E-RAB Evolved Radio Access Bearer
- QoS E-RAB Quality of Service
- the DRB configuration information may also include other related information.
- the E-RAB QoS parameter may be a QoS parameter after the first base station performs the offloading decision.
- the first base station may divide the Guaranteed Bit Rate (GBR), and the first base station DRB is shunted by 60%, and the second base station is shunted. 40%, the GBR parameter value sent to the second base station is 40% multiplied by the original GBR parameter value.
- the E-RAB quality of service parameter may also be that the first base station receives the original QoS parameter from the SGW, and the first base station and the second base station negotiate the offloading decision, and then the second base station adjusts the QoS parameter during scheduling.
- the first base station may carry the Signaling Radio Bearer (SRB) configuration information in the first request message.
- SRB Signaling Radio Bearer
- the second base station may establish an SRB corresponding according to the SRB configuration information. RLC entity and LCH.
- the first base station may receive the second request message from the second base station, where the second request message may be used to indicate that the first base station configures the first cell for the UE.
- the first base station may determine resource information of the first cell, such as radio resource configuration public information and radio resource configuration specific information of the first cell, according to the second request message.
- the first base station may send a second response message to the second base station, where 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.
- the first base station may configure the first cell for the UE according to the indication of the second base station.
- the second cell of the second base station may already have an RRC connection and a DRB with the UE.
- the first base station may configure the resource of the first cell for the UE according to the second request message, and may notify the second base station of the resource information of the first cell by using the second response message, and notify the UE of the resource information of the first cell by the second base station. So that the UE performs connection reconfiguration according to the resource information of the first cell.
- the second request message is further used to indicate that the first base station establishes a DRB for the UE.
- the first base station may establish, according to the second request message, a Packet Data Convergence Protocol (PDCP) entity, an RLC entity, and an LCH corresponding to the DRB.
- PDCP Packet Data Convergence Protocol
- the second request message may be further used to indicate that the first base station establishes an SRB for the UE.
- the first The base station may establish, according to the second request message, a PDCP entity, an RLC entity, and a logical channel corresponding to the SRB.
- the RLC entity may include a sender and a receiver, and the sender may include at least one of the following functional units: a transmission buffer, a retransmission buffer, a segmentation, and a cascade. (concatenation) unit, RLC PDU header information generating unit (add RLC header), and RLC control unit (RLC control) for automatic retransmission request (ARQ) function, etc.; wherein the RLC control unit may include at least the following A function: ARQ transmission window control and maintenance, ARQ receiving window control and maintenance, generating RLC status report transmission according to the receiving end entity receiving condition, and controlling the transmitting end retransmission according to the received RLC status report.
- the receiving end may include at least one of the following functional units: a routing unit, a reception buffer, a reordering function, a remove RLC header, an SDU reassembly unit, and the like;
- the routing unit includes functions of distinguishing between RLC PDUs and RLC status reports; wherein the reordering function is used to reorder the RLC PDUs that the MAC layer fails to deliver to the RLC layer in order, and the MAC layer is out of order because of the hybrid automatic repeat request ( Hybrid Automatic Repeat Request, HARQ)
- the sender can also support RLC PDU resegmentation.
- the RLC entity may be a sending entity or a receiving entity, and the sending entity may include at least one of the following functional units: a sending buffer, a segmentation and cascading unit, and an RLC PDU header information generating unit. Wait.
- the receiving entity may include at least one of the following functional units: receive buffer, reorder function, remove RLC header information, SDU reassembly unit, and the like.
- the second request message may be further used to indicate that the first base station is responsible for data offloading.
- the first base station may send a path switch request message to the Mobility Management Entity (MME) according to the second request message, so that the MME requests the SGW to switch the data transmission path to the path of the SGW to the first base station according to the path switch request message.
- MME Mobility Management Entity
- 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 hotspot coverage and capacity
- user service data transmission and reception are mainly performed by the micro base station
- the anchor can be Point migration to the micro base station to improve data transmission efficiency.
- the second base station may decide which base station to use as the user plane anchor point according to the status of the communication process, or the second base station and the first base station negotiate to determine which base station is used as the user plane anchor point, for example, the second base station.
- the user plane anchor point can be determined based on the splitting decision or the split ratio. If the split ratio occupied by the first base station is larger, for example, for the GBR, the second base station is offloaded by 30%, and the first base station is offloaded by 70%, the second base station may decide to use the first base station as the user plane anchor point. If the second base station is used as the user plane anchor point, then the anchor point migration, or path switch, is required to migrate the corresponding E-RAB to the interface between the first base station and the SGW.
- the first base station may send a path switch request message to the MME, and the MME sends a 7 change request message to the SGW, thereby completing the switching of the data transmission path.
- the shunt efficiency can be improved and the delay can be reduced.
- the second base station is a macro base station
- the first base station is a micro base station
- the radio condition of the UE at the micro base station is good
- the load of the micro base station is small
- the micro base station can bear a larger proportion of user service data, and then the The anchor is migrated to the micro base station to improve data transmission efficiency.
- the data volume of the foregoing first part of the downlink RLC PDU and the second part of the downlink RLC PDU may be statically configured or dynamically adjusted.
- the data volume of the first partial uplink RLC PDU and the second partial uplink RLC PDU may also be statically configured or dynamically adjusted.
- the first base station may send a capacity allocation request message to the second base station before requesting data offloading, requesting the second base station to prepare or reserve radio resources for transmitting the second partial downlink RLC PDU or receiving the second partial uplink RLC PDU.
- the second base station may reserve wireless resources for the second partial downlink RLC PDU or the second partial uplink RLC PDU in response to the capacity allocation request message of the first base station.
- the second base station may actively send a capacity allocation indication message to the first base station, where the capacity allocation indication message may indicate the capacity of the second base station or the reserved buffer information, so that the first base station sends the corresponding part or the buffered second part of the downlink RLC PDU.
- the capacity allocation indication message is used to learn the radio resource information that the second base station can allocate to the UE for sending the second partial uplink RLC PDU.
- the second base station may further send a capacity adjustment indication message to the first base station according to the scheduling capability and/or the buffer change status of the first base station, and notify the first base station of the information of reducing the capacity or increasing the capacity by using the capacity adjustment indication message.
- FIG. 2b is a schematic flow chart of a method of transmitting data according to an embodiment of the present invention. The method of Figure 2b is performed by the first base station.
- the first base station receives, from the UE, a first partial uplink RLC PDU in the uplink RLC PDU generated by the UE, and receives, from the second base station, a second partial uplink RLC PDU in the uplink RLC PDU, where the second partial uplink RLC PDU is the second.
- the base station receives from the UE.
- the first base station may receive the first part of the uplink RLC PDU. After the second part of the uplink RLC PDU, the first part of the uplink RLC PDU and the second part of the uplink RLC PDU are reassembled.
- the first base station may generate a second RLC status report according to the receiving status of the first partial uplink RLC PDU and the second partial uplink RLC PDU, and send a second RLC status report to the UE.
- the first base station may receive an RLC PDU of the uplink retransmission set determined by the UE according to the second RLC status report, where the uplink retransmission set includes the RLC PDU and/or the second partial uplink RLC PDU in the first partial uplink RLC PDU that needs to be retransmitted.
- the RLC PDU that needs to be retransmitted may be generated a second RLC status report according to the receiving status of the first partial uplink RLC PDU and the second partial uplink RLC PDU.
- the first base station may receive the RLC PDIL of the uplink retransmission set from the UE, or the first base station may receive the RLC PDU of the first uplink retransmission subset from the UE, and from the second The base station receives the RLC PDU in the second uplink retransmission sub-set, where the RLC PDU of the second uplink retransmission sub-set is received by the second base station from the UE, and the first uplink retransmission sub-set and the second uplink re-transmission sub-set are It is obtained by the UE dividing the uplink retransmission set.
- the first base station may receive the RLC PDU of the uplink retransmission set from the second base station, and the RLC PDU of the uplink retransmission set is received by the second base station from the UE.
- the first base station receives the first partial uplink RLC PDU in the uplink RLC PDU generated by the UE from the UE, and receives the second partial uplink RLC PDU in the uplink RLC PDU from the second base station, so that the first base station and the first base station
- the second base station can jointly transmit data with the UE, thereby being able to increase the peak rate and throughput of the UE.
- the UE does not need to switch between the two base stations, so that service delay or interruption due to handover can also be avoided.
- FIG. 3 is a schematic flowchart of a method of transmitting data according to an embodiment of the present invention. The method of Figure 3 is performed by a second base station.
- the second base station receives, from the first base station, a second partial downlink RLC PDU in the downlink RLC PDU generated by the first base station.
- the second base station sends a second partial downlink RLC PDU to the UE.
- the first base station may be a user plane anchor and is responsible for the offloading of data.
- the first base station may send the first partial downlink RLC PDU in the downlink RLC PDU to the UE, and send the second partial downlink RLC PDIL to the second base station.
- the second base station sends the second partial downlink RLC PDIL to the UE.
- the first base station may be a figure.
- One of the macro base station 110a and the micro base station 120a in la, the second base station may be another one.
- the first base station may also be one of the macro base station 110a and the micro base station 120a in FIG.
- the second base station can be another one.
- the second part of the downlink RLC PDU in the downlink RLC PDU generated by the first base station is sent by the second base station to the UE, which can improve the peak rate and throughput of the UE.
- the second base station may receive, from the UE, a second partial uplink RLC PDU in the uplink RLC PDU generated by the UE.
- the second base station can transmit a second partial uplink RLC PDU to the first base station.
- the second base station receives the second partial uplink RLC PDU from the UE, which may be that the second base station receives the second partial uplink data packet from the UE, and the second partial uplink data packet is processed by each protocol layer to obtain the second partial uplink RLC PDU.
- the second base station may process the second partial uplink data packet through the PHY layer and the MAC layer to obtain the second partial uplink RLC PDU.
- the second base station may receive the first RLC status report from the first base station, and determine, according to the first RLC status report, the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU. And retransmitting the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU to the UE.
- the second base station may receive the retransmission message from the first base station, and retransmit the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU according to the retransmission message, where the retransmission message indicates the second part of the downlink RLC PDU.
- the RLC PDU that needs to be retransmitted may be received from the first base station, and determine, according to the first RLC status report, the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU. And retransmitting the RLC PDU that needs to be retransmitted in the
- the second base station may retransmit the second part of the downlink RLC PDU to the UE according to the first RLC status report forwarded by the first base station or the retransmission message generated by the first base station according to the first RLC status report. Retransmitted RLC PDU.
- the second base station may receive the second retransmission message from the first base station, and the second retransmission message may indicate the second downlink retransmission sub-set.
- the second base station may retransmit the RLC PDU of the second downlink retransmission sub-set to the UE according to the second retransmission message.
- the first base station may determine, according to the first RLC status report, a downlink RLC PDU retransmission set, where the downlink RLC PDU retransmission set may include an RLC PDU and/or a retransmission in the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU.
- the first base station may divide the downlink RLC PDU retransmission set into a first downlink retransmission sub-set and a second downlink retransmission sub-set.
- the first base station may retransmit the RLC PDU of the first downlink retransmission sub-set to the UE, notify the second base station of the RLC PDU that the second base station needs to retransmit, by using the second retransmission message. If the one or more RLC PDUs in the second downlink retransmission sub-set belong to the original first partial downlink RLC PDU, since the first base station is responsible for the transmission of the first partial downlink RLC PDU, the second base station does not have the part of the RLC PDU. , then, the second base station still needs These RLC PDUs are to be received from the first base station.
- the real-time radio resources of the first base station and the second base station can be adapted and the quality of service (QoS) requirements of the service can be met, thereby improving the retransmission efficiency.
- QoS quality of service
- the second base station may receive the first RLC status report from the UE.
- the second base station may forward the first RLC status report to the first base station, where the first base station retransmits the first part of the downlink RLC PDU to the UE when the first RLC status report indicates the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU.
- the RLC PDU that needs to be retransmitted may be received.
- the second base station may retransmit the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU to the UE.
- the second base station may forward the first RLC status report to the first base station, and may enable the first base station to determine, according to the first RLC status report, that the first base station has a retransmission RLC PDU in the first part of the downlink RLC PDU, the first base station is heavy to the UE.
- the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU is transmitted.
- the second base station may receive the RLC PDU of the uplink retransmission set from the UE, and send the RLC PDU of the uplink retransmission set to the first base station, where the uplink retransmission set may include The RLC PDU that needs to be retransmitted in the first part of the uplink RLC PDU and/or the RLC PDU that needs to be retransmitted in the second partial uplink RLC PDU.
- the second base station may receive the RLC PDU of the second uplink retransmission sub-set from the UE, and send the RLC PDU of the second uplink retransmission sub-set to the first base station, where the second uplink retransmission sub-set is the UE-to-uplink retransmission
- the collection is divided.
- the UE may retransmit all the uplink RLC PDUs that need to be retransmitted to the second base station, and the second base station sends the uplink RLC PDUs that need to be retransmitted to the first base station.
- the UE may also divide the uplink RLC PDU that needs to be retransmitted into two parts, one part is retransmitted to the first base station, and the other part is retransmitted to the second base station, and the second base station sends the received part of the RLC PDU to the first base station. .
- the second base station may send the second partial downlink RLC PDU to the UE on the second cell of the second base station.
- the second base station may receive the first request message from the first base station, where the first request message may be used to indicate that the second base station configures the second cell for the UE.
- the second base station may determine resource information of the second cell according to the first request message.
- the second base station may send the first base station A response message, 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.
- the first request message may be further used to indicate that the second base station establishes a DRB for the UE.
- the second base station may establish an RLC entity and a logical channel corresponding to the DRB according to the first request message.
- the PDCP entity may not be established.
- the second base station may establish a PDCP entity. Since the function of the PDCP entity is not required, the PDCP entity may be closed after the establishment.
- the RLC entity may include a transmitting end and a receiving end, and the transmitting end may include at least one of the following functional units: a sending buffer, a retransmission buffer, and optionally, a segmentation unit, an RLC PDU header information generating unit, The RLC PDU re-segmentation function and the RLC header information may be generated by the re-segmentation; the transmission buffer is used to receive the RLC PDU sent by the first base station; and the retransmission buffer is used to save the RLC PDU that needs to be retransmitted, for example After the RLC PDU of the send buffer is sent to the UE for the first time, it is moved into the retransmission buffer.
- the RLC control unit controls RLC PDU retransmission of the second base station according to the RLC status report from the first base station; and controls RLC PDU retransmission of the second base station according to the RLC status report from the UE, and Forwarding the complete RLC status report control to the second base station; the RLC control unit does not generate the RLC status report itself, and does not need to maintain the ARQ transmission window and the reception window.
- the transmitting end may also include only a sending buffer, which is used to receive the RLC PDU sent by the first base station, and forwarded to the UE; the second base station does not need to support RLC PDU retransmission, or the first base station uses the RLC PDU that needs to be retransmitted as a new one.
- the RLC PDU is resent to the transmit buffer of the second base station for forwarding to the UE through the second base station.
- the receiving end may include at least one of the following functional units: a receiving buffer; optionally, including a reordering function; optionally, including a routing function; optionally, including an SDU reassembly unit, but set to a closed state.
- the RLC entity may be a sending entity or a receiving entity, and the sending entity may include at least one of the following functional units: a sending buffer, optionally, a fragmenting unit, an RLC PDU header information generating unit, and may only support RLC The PDU re-segmentation function and the RLC header information are generated by re-segmentation.
- the receiving entity may comprise at least one of the following functional units: a receive buffer, optionally including a reordering function; optionally, an SDU reassembly unit, but set to an off state.
- the second base station may send a second request message to the first base station, where the second request message may be used to indicate that the first base station configures the first cell of the first base station for the UE.
- the base station receives the second response message from the first base station, where the second response message carries the resource information of the first cell determined by the first base station according to the second request message.
- the second base station sends an RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration message carries the resource information of the first cell.
- the second request message is further used to indicate that the first base station establishes a DRB for the UE.
- FIG. 4 is a schematic flow chart of a method of transmitting data according to an embodiment of the present invention.
- the method of Figure 4 is performed by the UE, e.g., UE 130a in Figure la or 130b in Figure lb.
- the UE receives a first partial downlink RLC PDU in the RLC PDU generated by the first base station from the first base station, and receives a second partial downlink RLC PDU in the downlink RLC PDU from the second base station, where the second partial downlink RLC PDU is the first
- the second base station receives from the first base station.
- the UE receives the first part of the downlink RLC PDU in the downlink RLC PDU from the first base station, and receives the second part of the downlink RLC PDU obtained by the second base station from the first base station from the second base station, so that the UE can
- the two base stations transmit data together, thereby increasing the peak rate and throughput of the UE.
- the UEs in the coverage area common to the two base stations do not need to switch between the two base stations, so that service delay or interruption due to handover can also be avoided.
- the UE may reassemble the first partial downlink RLC PDU and the second partial downlink RLC PDU to form a downlink RLC SDU.
- the UE may generate an uplink RLC PDU.
- the UE may send the first partial uplink RLC PDU in the uplink RLC PDU to the first base station, and send the second partial uplink RLC PDU in the uplink RLC PDU to the second base station.
- the PDCP layer of the UE may receive an IP data packet from the application layer as a PDCP SDU, and after processing by the PDCP protocol layer, generate a PDCP PDU and submit it to the RLC layer as an RLC SDU, and generate an uplink RLC PDU by the RLC SDU.
- the UE may send a 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 the part of the RLC PDU to the first base station, so as to improve the peak rate and throughput of the UE.
- the UE sends the first part of the uplink RLC PDU to the first base station, which may be that the UE performs the protocol layer processing on the first part of the uplink RLC PDU, and then sends the first RLC PDU to the first base station.
- the UE may perform the first part of the uplink RLC PDU through the MAC layer. And processing with the PHY layer and transmitting to the first base station.
- the process in which the UE sends the second partial uplink RLC PDU to the second base station is similar, in order to avoid Repeat, no longer repeat here.
- the UE generates a first RLC status report according to the receiving status of the first partial downlink RLC PDU and the second partial downlink RLC PDU, where the first RLC status report indicates that the first part of the downlink RLC PDU needs to be retransmitted. Retransmitted RLC PDUs in the RLC PDU and/or the second partial downlink RLC PDU.
- the UE may send a first RLC status report to the first base station or the second base station.
- the UE may receive, from the first base station, the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU and/or receive the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU from the second base station.
- the UE may generate a first RLC status report according to the reception status of the first partial downlink RLC PDU and the second partial downlink RLC PDU.
- the UE may send the first RLC status report to the first base station, or may send the first RLC status report to the second base station. If there is an RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU, the UE may receive, from the first base station, the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU.
- the UE may receive the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU from the second base station.
- the UE may also divide the first RLC status report into two segments according to the uplink resource condition, and send two first RLC status reports from the first base station and the second base station, and the second base station forwards to the first base station that it receives the first RLC status report. A section of the first RLC status report.
- the UE for the RLC AM, the UE generates a first RLC status report according to the receiving status of the first partial downlink RLC PDU and the second partial downlink RLC PDU, and sends a first RLC status report to the first base station. .
- the UE may receive the RLC PDU of the first downlink retransmission sub-set from the first base station, and receive the RLC PDU of the second downlink retransmission sub-set from the second base station, where the first downlink retransmission sub-set and the second downlink weight
- the downlink RLC PDU retransmission set may be determined by the first base station according to the first RLC status report, and the downlink RLC PDU retransmission set may include the first part of the downlink RLC.
- the RLC PDU that needs to be retransmitted in the PDU and/or the RLC PDU that needs to be retransmitted in the second partial downlink RLC PDU is received from the second base station.
- the UE may receive the second RLC status report from the first base station.
- the UE may determine, according to the second RLC status report, an uplink retransmission set, where the uplink retransmission set includes an RLC PDU that needs to be retransmitted in the first partial uplink RLC PDU and/or an RLC PDU that needs to be retransmitted in the second partial uplink RLC PDU.
- the UE sends the uplink weight to the first base station.
- the UE may determine the uplink that needs to be retransmitted according to the second RLC status report.
- the UE may decide how to retransmit the RLC PDU to be retransmitted according to the uplink grant.
- the UE may retransmit all RLC PDUs that need to be retransmitted to the first base station, or retransmit all RLC PDUs that need to be retransmitted to the second base station.
- the UE may divide the RLC PDU that needs to be retransmitted into two parts, that is, the first uplink retransmission sub-set and the second uplink retransmission sub-set, and retransmit the two sub-set RLC PDUs to the first base station and the second base station, respectively.
- the UE may report, according to the second RLC status report, that the first base station confirms that the RLC PDU is successfully received in the second RLC status report, the UE updates the RLC AM transmission window and the corresponding state variable to continue to send the new RLC. PDU.
- the UE receives the first partial downlink RLC PDU from the first cell of the first base station, and receives the second partial downlink RLC PDU from the second cell of the second base station, where the first cell and the second cell
- the cells are located on different carriers.
- the UE may perform data transmission by using the first cell on the carrier of the first base station and the second cell on the carrier of the second base station.
- the UE may receive an RRC connection reconfiguration message from the first base station, where the RRC connection reconfiguration message carries resource information of the second cell determined by the second base station.
- the UE may also receive an RRC connection reconfiguration message from the second base station, where the RRC connection reconfiguration message carries the resource information of the second cell determined by the second base station.
- the UE may receive an RRC connection reconfiguration message from the second base station, where the RRC connection reconfiguration message carries resource information of the first cell determined by the first base station.
- the UE may also receive an RRC connection reconfiguration message from the first base station, where the RRC connection reconfiguration message carries resource information of the first cell determined by the first base station.
- FIG. 5 is a schematic diagram of a data transmission process according to an embodiment of the present invention.
- the first base station may be the macro base station 110a in FIG. 1a or the macro base station 110b in FIG. 1b.
- the second base station may be the micro base station 120a in FIG. 1a or the micro base station 120b in FIG.
- the UE may be the UE 130a in FIG. 1a or the UE 130b in FIG.
- the macro base station acts as a user plane anchor.
- the macro base station can receive the downlink data sent by the packet data network (PGW) from the SGW through the S1-U interface, and offload the downlink data, part of which is sent to the UE through the Uu interface, and another part is sent by the micro base station to the UE.
- the macro base station can also receive the uplink data from the UE through the Uu interface, and receive the uplink data sent by the UE to the micro base station from the micro base station, process the two pieces of uplink data, send the data to the SGW through the S1-U interface, and send the data to the PGW.
- FIG. 6 is a schematic flowchart of a data offload configuration process according to an embodiment of the present invention.
- the UE has established an RRC connection with the macro base station, and the cell of the current macro base station serves the UE. While the data transmission between the macro base station and the UE is performed, the macro base station can complete the data distribution configuration process with the micro base station. This process will be described in detail below.
- the UE sends a measurement report to the macro base station.
- the UE may generate a measurement report based on a Cell Specific Reference Signal (CRS) or a Channel State Information Reference Signal (CSI-RS).
- the measurement report may include RSRP measurements of the cells and neighbors of the macro base station.
- the macro base station determines, according to the measurement report, to increase a cell of the micro base station and/or establish a DRB. Adding a second cell may refer to a cell in which the UE aggregates the micro base station.
- the establishment of the DRB may be performed by the micro base station to establish a DRB for the UE.
- the macro base station may further determine to add a small cell of the micro base station according to the measurement result of the SRS by the macro base station, and may also determine to increase the cell of the micro base station according to other measurement results, such as CQI reported by the UE.
- the macro base station may determine to establish a DRB according to information such as QoS parameters, traffic volume, throughput, and peak rate of the DRB.
- the macro base station determines that the process of adding the cell of the base station and determining the establishment of the DRB are performed in a non-sequential manner, or may be performed simultaneously. For example, the macro base station may determine to add the second cell and/or establish the DRB at the same time, or may first determine to increase the cell of the micro base station, and then determine to establish the DRB, or first determine to establish the DRB, and then determine to increase the cell of the base station. This embodiment of the invention does not Limited.
- the macro base station sends a first request message to the base station.
- the first request message may instruct the base station to configure a cell of the base station for the UE.
- the first request message may also instruct the base station to establish a DRB for the UE.
- the macro base station may instruct the micro base station to configure the cell of the base station and establish the DRB in the first request message, or may send the first request message to the base station twice, respectively, instructing the micro base station to configure the cell of the micro base station and establish the DRB. .
- the macro base station may carry the configuration information of the DRB in the first request message.
- the DRB configuration information may include at least one of the following: an Evolved Radio Access Bearer (E-RAB) identifier, an E-RAB QoS parameter, a DRB identifier, RLC configuration information, and logical channel configuration information.
- E-RAB Evolved Radio Access Bearer
- the DRB configuration information may also include other related information.
- the E-RAB QoS parameter may be a QoS parameter after the macro base station performs the offloading decision.
- the micro base station may divide the Guaranteed Bit Rate (GBR), the macro base station DRB is shunted by 60%, and the micro base station is shunted by 40%.
- the GBR parameter value sent to the micro base station is 40% multiplied by the original GBR parameter value.
- the micro base station configures a cell of the micro base station according to the first request message, and establishes a DRB for the UE.
- the micro base station can perform admission control according to the first request message, configure resources of the cell of the micro base station, and determine resource information of the cell of the micro base station.
- the micro base station may establish an RLC entity and a logical channel corresponding to the DRB according to the configuration information of the DRB carried in the first request message, and set the DRB parameter, the RLC parameter, the logical channel parameter, and QoS parameters, etc.
- the QoS parameter can be configured according to the split ratio carried in the first request message.
- the micro base station may not establish a PDCP entity.
- the micro base station can establish a PDCP entity and shut down the PDCP entity.
- the configuration of the micro base station's cell and the establishment of the DRB by the micro base station are two processes, and the execution is not sequential. However, in order to implement the subsequent data offloading process, both processes need to be completed.
- the micro base station sends a first response message to the macro base station.
- the first response message may carry resource information of a cell of the micro base station.
- the macro base station sends an RRC connection reconfiguration message to the UE.
- the RRC connection reconfiguration message may carry resource information of a cell of the micro base station.
- the DRB configuration of the UE can use the previous DRB configuration. If the DRB needs to be reconfigured for the UE, the macro base station may carry the configuration information of the DRB in the RRC connection reconfiguration message.
- the UE performs connection reconfiguration according to the RRC connection reconfiguration message.
- the UE may configure the cell-related radio resource of the base station according to the resource information of the cell of the micro base station carried in the RRC connection reconfiguration message.
- the UE may perform DRB reconfiguration according to the configuration information of the DRB.
- the UE sends an RRC connection reconfiguration complete message to the macro base station.
- the UE After the reconfiguration succeeds, the UE notifies the macro base station that the reconfiguration is complete.
- the macro base station sends a configuration complete message to the base station.
- the macro base station notifies the micro base station that the UE completes the connection reconfiguration by configuring the completion message.
- the UE performs a random access procedure with the micro base station to complete uplink synchronization with the micro base station. It should be noted that step 610 can also be performed between step 607 and step 608. If the UE completes the uplink synchronization with the micro base station after the step 608, the UE may also send the RRC connection reconfiguration complete message to the micro base station, and the micro base station forwards the RRC connection reconfiguration to the macro base station. Message. The UE may notify the macro base station after the random access of the micro base station is successful, so that the macro base station starts to offload data to the micro base station.
- the macro base station can acquire downlink data from the SGW and generate downlink RLC PDUs according to the downlink data.
- the macro base station may send the first part of the downlink RLC PDU in the downlink RLC PDU to the UE, and send the second part of the downlink RLC PDU in the downlink RLC PDU to the micro base station.
- the micro base station can send the second part of the downlink RLC PDIL to the UE.
- the UE may generate an uplink RLC PDU, send a first partial uplink RLC PDU in the uplink RLC PDU to the macro base station, and send a second partial uplink RLC in the uplink RLC PDU to the micro base station.
- the PDIL micro base station sends the second part to the macro base station.
- the uplink RLC PDIL is retransmitted by the macro base station to the two parts of the uplink RLC PDU and other processing, and then sent to the SGW.
- the macro base station is used as the user plane anchor point, so that the macro base station and the micro base station can jointly transmit data with the UE, thereby improving the peak rate and throughput of the UE.
- the UE does not need to switch between the macro base station and the micro base station, and can also avoid service delay or interruption due to switching.
- the macro base station is used as the user plane anchor point.
- the micro base station can also be used as the user plane anchor point. Description will be made below with reference to Figs. 7 and 8.
- FIG. 7 is a schematic diagram of a data transmission process according to an embodiment of the present invention.
- the first base station is a micro base station
- the second base station is a macro base station as an example.
- the first base station may be the micro base station 120a in Figure la or the micro base station 120b in Figure lb
- the second base station may be the macro base station 110a in Figure la or the macro base station 110b in Figure lb
- the UE may be UE 130a in Figure la or UE 130b in Figure lb.
- the micro base station acts as a user plane anchor.
- the micro base station can receive the downlink data sent by the PGW from the SGW through the S1-U interface, and offload the downlink data, part of which is sent to the UE through the Uu interface, and another part is sent by the macro base station to the UE.
- the micro base station can also receive the uplink data from the UE through the Uu interface, and receive the uplink data sent by the UE to the macro base station from the macro base station, process the two pieces of uplink data, send the data to the SGW through the S1-U interface, and send the data to the PGW.
- FIG. 8 is a schematic flowchart of a configuration process of data offloading according to an embodiment of the present invention.
- the UE has established an RRC connection with the macro base station, and the cell of the current macro base station serves the UE. While the macro base station and the UE can perform data transmission, the macro base station can complete the data offload configuration process with the micro base station. This process will be described in detail below.
- Step 801 is similar to step 601 in FIG. 6. To avoid repetition, details are not described herein again. 802.
- the macro base station determines, according to the measurement report, the cell of the micro base station to be added and/or establishes a DRB, and determines an anchor point migration.
- the macro base station determines that the process of adding the cell of the micro base station and establishing the DRB is similar to the step 602 in FIG. 6. To avoid repetition, details are not described herein again.
- the macro base station may determine the micro base station as an anchor point according to the traffic distribution policy or the split ratio based on the related information such as the measurement report. For example, if the proportion of the splitting of the micro base station is larger, for example, for the GBR, the macro base station is offloaded by 30%, and the base station is split by 70%, then the macro base station can determine the anchor point migration, and the micro base station acts as the user plane anchor point, that is, the path is performed. Switch to migrate the corresponding E-RAB to the micro base Station and SGW's Sl-U interface.
- the split ratios of the DRBs can be kept as consistent as possible.
- the split ratio can be a large split ratio of the micro base station and a split ratio of the macro base station. small.
- the macro base station sends a second request message to the base station.
- the second request message may instruct the base station to configure a cell of the base station for the UE.
- the second request message may also instruct the base station to establish a DRB for the UE.
- the second request message may also indicate that the base station is the user plane anchor.
- step 803 is similar to step 603 in FIG. 6. To avoid repetition, it will not be described here.
- the micro base station configures a cell of the micro base station according to the second request message, and establishes a DRB for the UE, and prepares a fault point migration.
- the process of configuring the cell of the micro base station for the UE by the micro base station is similar to the step 604 in FIG. 6. To avoid repetition, details are not described herein again.
- the micro base station may establish a PDCP entity, an RLC entity, and a logical channel corresponding to the DRB according to the configuration information of the DRB carried in the second request message, and set the DRB parameter, the PDCP parameter, and the RLC. Parameters, logical channel parameters, and QoS parameters.
- the QoS parameter may be configured according to the split ratio carried in the second request message.
- step 804 the micro base station needs to be quasi-point migration.
- the micro base station sends a second response message to the macro base station.
- the second response message may carry resource information of a cell of the micro base station.
- the second response message may also indicate that the micro base station is migrating.
- the macro base station sends an RRC connection reconfiguration message to the UE.
- the RRC connection reconfiguration message may carry resource information of a cell of the micro base station.
- the DRB configuration of the UE can use the previous DRB configuration. If the DRB needs to be reconfigured for the UE, the macro base station may carry the configuration information of the DRB in the RRC connection reconfiguration message.
- the UE performs RRC connection reconfiguration according to the RRC connection reconfiguration message.
- the UE may configure the cell-related radio resource of the base station according to the resource information of the cell of the micro base station carried in the RRC connection reconfiguration message. If the configuration information of the DRB is also carried in the RRC connection reconfiguration message, the UE may further perform DRB reconfiguration according to the configuration information of the DRB.
- the UE sends an RRC connection reconfiguration complete message to the macro base station.
- the UE After the reconfiguration succeeds, the UE notifies the macro base station that the reconfiguration is complete.
- the macro base station sends a configuration complete message to the base station.
- the macro base station notifies the micro base station that the UE completes the connection reconfiguration by configuring the completion message.
- the base station sends a path switch request message to ⁇ .
- the Path Switch Request message may indicate that the data transmission path is switched to the micro base station.
- the bearer change request message may request the SGW to switch the data transmission path.
- the SGW switches the path according to the bearer change request message.
- the SGW sends a change response message to the ⁇ .
- the MME sends a path switch response message to the base station.
- the UE performs a random access procedure with the micro base station to complete uplink synchronization with the micro base station.
- step 815 can be performed in parallel with the path switching process of steps 810 through 814.
- the macro base station may continue the data transmission process with the UE to complete the transmission of the already buffered data in the Radio Bearer (RB) (including the SRB and the DRB).
- RB Radio Bearer
- the data is transmitted between the micro base station and the UE, and the data is transmitted by the macro base station and the UE. Data is transmitted between the micro base station and the SGW.
- the micro base station can acquire downlink data from the SGW and generate downlink RLC PDUs according to the downlink data.
- the micro base station may send the first part of the downlink RLC PDU in the downlink RLC PDU to the UE, and send the second part of the downlink RLC PDU in the downlink RLC PDU to the macro base station.
- the macro base station may send the second part of the downlink RLC PDIL to the UE.
- the UE may generate an uplink RLC PDU, send a first partial uplink RLC PDU in the uplink RLC PDU to the micro base station, and send a second partial uplink RLC PDIL in the uplink RLC PDU to the macro base station.
- the macro base station sends the second part to the micro base station.
- the uplink RLC PDIL is reassembled by the micro base station for the two parts of the RLC PDU and is subsequently processed and sent to the SGW.
- the macro base station is used as the user plane anchor point, so that the macro base station and the micro base station can jointly transmit data with the UE, thereby improving the peak rate and throughput of the UE.
- the UE does not need to switch between the macro base station and the micro base station, and can also avoid service delay or interruption due to switching.
- FIG. 9 is a schematic diagram of an example of a control plane protocol stack in accordance with an embodiment of the present invention.
- control plane protocol stack of Fig. 9 can be applied to the examples of Figs. 5 to 8 described above.
- the UE and the macro base station have established an RRC connection, the control plane function is provided by the macro base station, and the control plane message transmission is between the macro base station and the UE, and the data of the signaling radio bearer (SRB) No splitting is done.
- the control plane related signaling transmission between the macro base station and the micro base station can be performed through an X2 interface or a direct connection between the macro base station and the micro base station. It should be understood that although the SRB splitless flow is taken as an example in FIG. 9, in the embodiment of the present invention, the data of the SRB may also be split.
- the connection between the RRC, PDCP, RLC, MAC, and PHY layers of the macro base station and the UE indicates a logical connection of the peer protocol layer on the radio interface between the macro base station and the UE, indicating that the sender is in each
- the data sent by the protocol layer is processed by the peer-to-peer protocol layer at the receiving end to form data of the same format and content as the transmitting end.
- the control plane data transmission process may be as follows: on the transmitting end side, the RRC message is processed by the PDCP, RLC, MAC, and PHY protocol layers, and then sent to the receiving end through the wireless interface, and the receiving end passes the wireless interface.
- the received control plane data is first processed by the PHY layer and then submitted to the MAC, RLC, PDCP, and RRC layers for processing.
- the transmitting end is a macro base station, and then the receiving end is a UE.
- the transmitting end is a UE, and then the receiving end is a macro base station.
- control plane data There may be no transmission of control plane data between the micro base station and the UE.
- the macro base station provides a control plane function as an example for explanation.
- the macro base station and the micro base station may jointly provide a control plane function, for example, when the UE in the common coverage area of the macro base station and the micro base station has an RRC connection with the macro base station and the micro base station at an initial time,
- the control plane function can be provided jointly by the macro base station and the micro base station.
- FIG. 10 is a schematic diagram of an example of a user plane protocol stack in accordance with an embodiment of the present invention.
- the macro base station is a user plane anchor point, and the macro base station needs to be offloaded by two DRBs.
- the user plane protocol stack of the macro base station is described as follows:
- the DRB to be offloaded is DRB1 and DRB2, the PDCP entity PDCP1 corresponding to DRB1, the RLC entity RLC1, and the logical channel LCH1 are established; the PDCP2, RLC2, and LCH2 corresponding to DRB2 are established; the logical channel is located between the RLC layer and the MAC layer. , LCH1 and LCH2 are not shown in FIG. It is assumed that the carrier participating in the aggregation in the macro base station is CC1, the corresponding cell is the primary cell (PCell), the PCell is configured with one MAC layer MAC1 and one PHY layer PHY1, and one HARQ entity HARQ1 is set at the MAC layer.
- the carrier participating in the aggregation in the macro base station is CC1
- the corresponding cell is the primary cell (PCell)
- the PCell is configured with one MAC layer MAC1 and one PHY layer PHY1, and one HARQ entity HARQ1 is set at the MAC layer.
- the LCH1 corresponding to the DRB1 and the LCH2 corresponding to the DRB2 are mapped to the downlink shared transport channel (Downlink Share Channel, DL-SCH) DL-SCH1 or the uplink shared transport channel (UL-SCH) UL-SCH1 through the MAC layer.
- the channel is located between the MAC layer and the PHY layer, and DL-SCH1 and UL-SCH1 are not shown in FIG.
- the connection between the PDCP, the RLC, the MAC, and the PHY of the macro base station and the UE indicates the logical connection of the peer protocol layer on the radio interface between the macro base station and the UE, indicating that the data sent by the sender at each protocol layer is at the receiving end.
- the peer-to-peer protocol layer is processed to form data of the same format and content as the sender.
- the DRB1 of the macro base station corresponds to the DRB1 of the UE.
- PDCP1 and RLC1 in the macro base station correspond to PDCP1 and RLC1 of the UE;
- PDCP2 and RLC2 in the macro base station correspond to PDCP2 and RLC2 of the UE.
- connection between the macro base station and the micro base station at the RLC layer indicates that data splitting is performed at the RLC layer, and RLC1 and RLC2 of the macro base station correspond to RLC1 and RLC2 of the micro base station, respectively.
- the user plane data transmission process can be as follows:
- the Internet Protocol (IP) data packet from the SGW is sent to the UE through the radio interface after the macro base station processes the PDCP, RLC, MAC, and PHY protocol layers.
- the UE can process the data received through the wireless interface first through the PHY layer and then to the MAC, RLC, and PDCP layers for processing.
- the UE For uplink data, the UE passes IP packets from the application layer through PDCP, RLC, and MAC.
- the PHY protocol layers are processed and sent to the macro base station via the radio interface.
- the macro base station first processes the data received through the radio interface through the PHY layer, and then delivers it to the MAC, RLC and PDCP layers in turn.
- the DRB to be offloaded is DRB1 and DRB2, which are used to offload data of DRB1 and DRB2 of the macro base station, respectively, and the offloading is performed at the RLC layer.
- RLC layer of the micro base station Provides a send buffer and a retransmission buffer, and can support RLC PDU re-segmentation.
- DRB1 sets the corresponding RLC entity RLC1 and logical channel LCH1;
- DRB2 sets the corresponding RLC2 and LCH2; the logical channel is located between the RLC layer and the MAC layer, and LCH1 and LCH2 are not shown in FIG.
- the carrier participating in the aggregation in the base station is CC2, the corresponding cell is a secondary cell (Secondary Cell, SCell), the SCell is configured with one MAC layer MAC2 and one PHY layer PHY2, and one HARQ entity HARQ2 is set at the MAC layer.
- the logical channel of DRB1 and the logical channel of DRB2 are mapped to the transport channel DL-SCH2 or UL-SCH2 through the MAC layer, the transport channel is located between the MAC layer and the PHY layer, and DL-SCH2 and UL-SCH2 are not shown in FIG. .
- the connection between the micro base station and the RLC, MAC, and PHY of the UE indicates a logical connection of the peer protocol layer on the radio interface between the micro base station and the UE, indicating that the data sent by the sender at each protocol layer is peered at the receiving end.
- the protocol layer is processed to form data of the same format and content as the sender.
- the DRB1 of the micro base station corresponds to the DRB1 of the UE, and correspondingly, the RLC1 of the micro base station corresponds to the RLC1 of the UE; the RLC2 of the micro base station corresponds to the RLC2 of the UE.
- connection between the macro base station and the micro base station at the RLC layer indicates that data splitting is performed at the RLC layer, and RLC1 and RLC2 of the macro base station correspond to RLC1 and RLC2 of the micro base station, respectively.
- the user plane data transmission process can be as follows:
- the micro base station may store the RLC PDUs from the macro base station in the transmission buffer of the corresponding RLC entity for scheduling, and after being processed by the RLC, MAC, and PHY protocol layers, and sent to the UE through the radio interface. If the complete RLC PDU cannot be transmitted due to radio resource limitation when the RLC PDU is first transmitted, the RLC PDU may be segmented; it should be noted that the segmentation in this case is handled in the re-segmentation manner of the RLC PDU according to the existing protocol. Instead of segmenting the RLC SDUs according to existing protocols. The UE can process the data received through the wireless interface first through the PHY layer and then to the MAC, RLC, and PDCP layers for processing.
- the UE may process the IP data packets from the application layer through the PDCP, RLC, MAC, and PHY protocol layers and then send them to the micro base station through the radio interface.
- the data received by the micro base station through the wireless interface is first processed by the PHY layer, and then delivered to the MAC and the RLC in turn, and the RLC PDUs formed by the RLC layer are sent to the RLC entity corresponding to the macro base station through the X2 interface.
- the DRB is the DRB 1 and the DRB2, and the PDCP1, the RLC entity RLC1, and the logical channel LCH1 corresponding to the DRB1 are established; the PDCP2, the RLC2, and the LCH2 corresponding to the DRB2 are established; the logical channel is located between the RLC layer and the MAC layer, LCH1 And LCH2 is not in Figure 10 show.
- the UE may configure one MAC layer, including a multiplexing/demultiplexing entity, which is not shown in FIG.
- two HARQ entities are configured, which respectively correspond to the PCell of the macro base station and the SCell of the micro base station aggregated by the UE.
- the PCell is configured with a PHY layer PHY1
- the SCell is configured with a PHY layer PHY2 corresponding to the HARQ1 and HARQ2 of the MAC layer, respectively.
- the logical channel of DRB1 and the logical channel of DRB2 are mapped to the transport channel DL-SCH1 or UL-SCH1, or DL-SCH2 or UL-SCH2 through the MAC layer, and the transport channel is located between the MAC layer and the PHY layer, DL-SCH1, UL -SCH1, DL-SCH2, and UL-SCH2 are not shown in FIG.
- the communication method between the UE and the macro base station and the micro base station is similar to that described above on the macro base station and the micro base station side. To avoid repetition, details are not described herein again.
- layer 2 may include a PDCP layer, an RLC layer, and a MAC layer.
- FIG. 11 is a schematic structural diagram of layer 2 in a protocol stack of a macro base station according to an embodiment of the present invention.
- the main functions of the PDCP layer can include header compression (Robust Header).
- Security functions such as Compression, ROHC and security can include integrity protection and cyphering.
- the main functions of the RLC layer can include segmentation, re-segmentation, and automatic retransmission request (ARQ).
- ARQ automatic retransmission request
- the main functions of the MAC layer may include scheduling/priority processing, multiplexing/demultiplexing, and HARQ.
- the SAP between the PDCP layer and the upper application layer is provided by the SAP between the Service Access Point (SAP), the PDCP layer and the RLC layer.
- the SAP between the RLC layer and the MAC layer provides the LCH.
- the SAP between the MAC layer and the physical layer provides a Transport Channel, which may include DL-SCH and UL-SCH.
- the macro base station can provide a PCell for the UE, and its MAC layer can be configured with one HARQ entity.
- FIG. 12 is a schematic structural diagram of layer 2 in a protocol stack of a micro base station according to an embodiment of the present invention. In Fig. 12, the DRB shunting from the RLC layer is taken as an example. The PDCP entity and corresponding functions are not set at the micro base station.
- the RLC layer of the micro base station can be equivalent to the extension of the RLC layer of the macro base station, and provides some functions of the RLC layer, and does not need to provide all RLC functions.
- the micro base station receives the RLC PDU sent by the RLC layer of the macro base station through the X2 interface or the direct connection, and is stored in the transmission buffer of the RLC layer of the micro base station.
- the micro base station can also receive the RLC of the macro base station
- the layer reports the RLC status sent through the X2 interface or the direct connection, and retransmits the RLC PDU that needs to be retransmitted to the UE according to the RLC status report.
- the micro base station can receive the RLC PDU sent by the UE, store it in the receiving buffer of the RLC layer of the micro base station, and forward it to the macro base station.
- the function of the MAC layer is similar to that of the MAC layer of the macro base station in FIG. 11. To avoid repetition, details are not described herein again.
- the micro base station may provide a SCell for the UE, and its MAC layer sets one HARQ entity.
- FIG. 13 is a schematic structural diagram of layer 2 in a protocol stack of a UE according to an embodiment of the present invention.
- the functions of the PDCP, the RLC, and the MAC layer of the UE are similar to those of the corresponding protocol layer of the macro base station in FIG. 11. To avoid repetition, details are not described herein again.
- the MAC layer of the UE may be configured with two HARQ entities, which respectively correspond to CC1 provided by the macro base station and CC2 provided by the micro base station.
- the HARQ entity on CC1 can be mapped to DL-SCH and UL-SCH on CC1
- 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 CC1.
- two HARQ entities may be set in the MAC layer in the layer 2 structure of the macro base station, respectively.
- the structures of the PDCP and RLC layers are the same as those of the PDCP and RLC layers in FIG.
- the MAC layer in the layer 2 structure of the micro base station may be configured with two HARQ entities corresponding to two CCs provided by the base station, and the structure of the RLC layer is the same as that of the RLC layer in FIG.
- the MAC layer may be configured with four HARQ entities corresponding to two CCs provided by the macro base station and two CCs provided by the micro base station.
- FIG. 14 is a schematic flow chart of a process of a method of transmitting data according to an embodiment of the present invention.
- Fig. 14 the data transmission process in the downstream direction in step 611 of Fig. 6 will be described in detail.
- the macro base station generates a downlink PDCP PDU and submits it to the RLC layer.
- the macro base station uses the downlink IP data packet from the SGW as a PDCP SDU, and performs PDCP layer header compression, encryption, and addition of a PDCP sequence number (SN) to generate a PDCP PDU, and the PDCP PDU is delivered to the RLC layer as an RLC SDU.
- the macro base station delivers the PDCP PDU in PDCP1 to RLC1 and the PDCP PDU in PDCP2 to RLC2. 1402.
- the macro base station determines a first part of the downlink RLC PDU that is sent by the macro base station and a second part of the downlink RLC PDU that is sent by the micro base station.
- the macro base station can determine the amount of data to be offloaded according to the DRB offload policy and the QoS parameter configuration determined or negotiated in advance, that is, which downlink RLC SDUs are offloaded to the macro base station and which downlink RLC SDUs are offloaded to the micro base station.
- the MAC layer of the macro base station can determine the amount of data that can be scheduled by a certain Transmission Time Interval (TTI) according to the QoS requirement and the radio resource condition of the macro base station, indicating that the RLC layer is to be generated.
- TTI Transmission Time Interval
- the MAC layer may indicate the total size of one or more downlink RLC PDUs to be generated by the RLC layer; the RLC layer may segment, cascade, and downlink the RLC SDU according to the downlink RLC PDU size indicated by the MAC layer After the header information processing such as the RLC SN is added, the RLC1 and the RLC2 in the first part of the downlink RLC PDIL macro base station are generated to generate different downlink RLC PDUs. In some cases, one or more different downlink RLC PDUs may be generated in RLC1 and RLC2, or one or more different downlink RLC PDUs may be generated only by RLC1 or RLC2.
- the MAC layer of the macro base station may determine the amount of data that a certain port can be offloaded to the micro base station according to the offload decision and the QoS requirement, thereby indicating the size of the downlink RLC PDU to be generated by the RLC layer;
- the layer may indicate the total size of one or more downlink RLC PDUs to be generated by the RLC layer; the RLC layer may perform segmentation, cascading, and adding RLC SN and other header information processing on the downlink RLC SDU according to the downlink RLC PDU size indicated by the MAC layer. Then, the second part of the downlink RLC PDIL is generated.
- RLC1 and RLC2 may respectively generate one or more different RLC PDUs to be offloaded to the micro base station, or may generate one or more different ones only by RLC1 or RLC2.
- the macro base station sends the first part of the downlink RLC PDIL to the UE.
- the RLC layer of the macro base station may deliver the generated first partial downlink RLC PDU to the MAC layer of the macro base station as a MAC SDU, and perform multiplexing processing with the MAC SDU of the logical channel and/or other logical channels to generate a MAC PDU.
- the transport block (TB) the first part of the RLC PDUs in RLC1 and RLC2 can be multiplexed in the same TB.
- the macro base station sends the second part of the downlink RLC PDIL to the micro base station.
- the macro base station can connect the second part through the X2 interface between the macro base station and the micro base station or directly
- the downlink RLC PDU is sent to the micro base station.
- the micro base station prepares to deliver the second part of the downlink RLC PDU.
- the micro base station After receiving the second part of the downlink RLC PDU of the RLC1 of the macro base station, the micro base station can store it in the transmission buffer of the micro base station RLC1. After receiving the second partial downlink RLC PDU of the RLC2 of the macro base station, the micro base station can store it in the transmission buffer of the micro base station RLC2.
- the MAC layer of the micro base station determines the amount of data that can be scheduled according to the offload decision and QoS requirements, and indicates the size of the downlink RLC PDU to be generated by the RLC layer.
- the MAC layer may indicate to the RLC layer the total size of one or more downstream RLC PDUs.
- the MAC layer may indicate the original downlink RLC PDU size to the RLC layer, meaning that one or more original downlink RLC PDUs stored in the RLC transmission buffer are directly handed over to the MAC layer as a MAC SDU without any processing.
- the MAC layer may indicate to the RLC layer that the total downlink RLC PDU size is smaller than the original downlink RLC PDU size, which means that the downlink RLC PDU segment is generated after the original downlink RLC PDU is re-segmented, and the segment is delivered to the MAC layer, and the RLC layer does not have another Add force port RLC SN.
- the RLC layer of the micro base station does not need to support the RLC PDU cascading function. It should be noted that, in a certain TTI, one or more different original downlink RLC PDUs or downlink RLC PDU fragments may be respectively delivered to the MAC layer in both RLC1 and RLC2, and only the last downlink RLC PDU may be a downlink RLC PDU fragment. The downlink RLC PDU may also be delivered to the MAC layer only by RLC1 or RLC2.
- the micro base station can improve the priority of the UE in the inter-base station CA scenario to ensure the radio resources required for the offloading data, so that sufficient downlink resources can be allocated to transmit the original second partial downlink RLC PDIL to the micro base station or, if Due to the radio interface resource limitation, the radio resource allocated to the UE cannot accommodate the original second partial downlink RLC PDU, and the original second partial downlink RLC PDU needs to be re-segmented at the RLC layer of the micro base station.
- the micro base station sends a second part of the downlink RLC PDIL to the UE.
- the RLC layer of the base station may forward the original second partial downlink RLC PDU or the downlink RLC PDU segment re-segmented to the second partial downlink RLC PDU to the MAC layer of the micro base station as the MAC SDU, and the logical channel and/or After the MAC SDUs of other logical channels are multiplexed, a MAC PDU or a TB is generated, where the downlink RLC PDUs in RLC1 and RLC2 can be multiplexed in the same TB.
- the TB is delivered to the PHY layer of the micro base station, it is sent by the PHY layer to the UE on the PDSCH on the SCell.
- the micro base station can transmit the downlink RLC PDU in ascending order of the RLC SN. For RLC AM, the micro base station does not need to maintain the RLC AM transmission window.
- 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 a downlink RLC SDU.
- the UE After receiving the physical layer data on the PDSCH of the PCell and the PDSCH of the SCell, the UE delivers the corresponding TB to the HARQ1 and HARQ2 corresponding to the MAC layer after the PHY1 and PHY2 are processed successfully, and the MAC layer demultiplexes the TB and then the MAC SDU. That is, the RLC PDU is delivered to the corresponding RLC entities RLCl and RLC2.
- the RLC layer of the UE may be distinguished from the PCell and the SCell, and may be divided into RLC1 and RLC2 according to the DRB.
- the HARQ entity and the PHY layer of the MAC layer may be distinguished according to different serving cells, and are transparent to the RLC layer of the UE.
- the RLC layer of the UE may receive the RLC PDU delivered by the MAC layer, and the RLC1 and the RLC2 may perform the corresponding RLC PDU receiving process according to the RLC mode being the RLC UM or the RLC AM (each RLC entity is one of the two RLC modes).
- the successfully received RLC PDUs are sorted in ascending order by RLC SN to form an RLC SDU, which is delivered to the PDCP layer.
- step 1403 may be performed in parallel with step 1404 to step 1406, or step 1404 may be performed first, followed by step 1403.
- FIG. 15 is a schematic flowchart of a downlink data retransmission process according to an embodiment of the present invention.
- the UE receives the first part of the downlink RLC PDU and the second part of the downlink RLC PDU, and generates a first RLC status report according to the receiving status of the first part of the downlink RLC PDU and the second part of the downlink RLC PDU.
- the UE may generate a first RLC status report corresponding to the RLC1 according to the receiving status of the first part downlink RLC PDU and the second part downlink RLC PDU of the RLC1, and may perform the first part downlink RLC PDU and the second part downlink RLC according to the first part of the RLC2. PDU reception status, raw The first RLC status report corresponding to RLC2.
- the UE sends a first RLC status report to the macro base station.
- the UE may separately send a first RLC status report corresponding to RLC1 and a first RLC status report corresponding to RLC2 to the macro base station.
- the first RLC status report indicates that the first part of the downlink RLC PDU needs to be retransmitted.
- the macro base station retransmits the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU to the UE.
- the macro base station updates the RLC AM transmission window and the corresponding state variable to continue transmitting the new RLC PDU.
- RLC1 and RLC2 of the macro base station may respectively determine, according to the corresponding first RLC status report, which RLC PDUs in the first part of the downlink RLC PDU need to be retransmitted, and in the second part of the downlink RLC PDU. Which RLC PDUs need to be retransmitted by the micro base station.
- the RLC1 and the RLC2 of the macro base station may retransmit the RLC PDUs that need to be retransmitted in the corresponding first part of the downlink RLC PDUs to the UE respectively.
- the macro base station sends a first RLC status report or a retransmission message to the micro base station.
- the macro base station may send a first RLC status report to the micro base station through an X2 interface or a direct connection.
- the macro base station may also generate a retransmission message according to the first RLC status report, and the retransmission message may indicate the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU.
- the micro base station retransmits the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU according to the first RLC status report or the retransmission message.
- RLC1 and RLC2 of the micro base station may respectively determine which RLC PDUs in the corresponding second partial downlink RLC PDUs need to be retransmitted according to the corresponding first RLC status report.
- the RLC1 and the RLC2 of the micro base station may respectively retransmit the RLC PDUs that need to be retransmitted in the corresponding second partial downlink RLC PDUs to the UE.
- the micro base station may notify the macro base station to perform 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 reserves a backup in the retransmission buffer for each RLC PDU in the second part of the downlink RLC PDU that is offloaded to the micro base station.
- the micro base station directly notifies the RLC PDU SN of the second part of the downlink RLC PDU of the macro base station that needs to be retransmitted.
- the macro base station receives the first RLC status report of the UE, and the macro base station may perform retransmission for the case that the macro base station determines that the micro base station retransmission is required and the number of retransmissions of the micro base station has reached a predetermined number of times but the maximum number of retransmissions has not been reached yet. .
- the macro base station may notify the micro base station to transmit the relevant RLC PDU that needs to be retransmitted to the macro base station, or the macro base station buffers each RLC PDU in the second part of the downlink RLC PDU that is offloaded to the micro base station.
- a backup is reserved in the area; if the macro base station decides to perform the retransmission, the status of the corresponding RLC PDU to be retransmitted is changed to the acknowledgement status (Acknowledge, in the first RLC status report sent to the micro base station).
- ACK acknowledgement status
- step 1503 may be performed in parallel with steps 1504 through 1505, or step 1504 and step 1505 may be performed first, followed by step 1503.
- the UE may send a first RLC status report to the macro base station.
- the UE may also send a first RLC status report to the micro base station. Description will be made below with reference to Fig. 16.
- FIG. 16 is a schematic flowchart of a downlink data retransmission process according to an embodiment of the present invention.
- the UE generates a first RLC status report according to the receiving status of the first part of the downlink RLC PDU and the second part of the downlink RLC PDU.
- the UE may downlink the RLC PDU and the second part according to the first part of RLC1.
- the RLC PDU receives the first RLC status report corresponding to the RLC1, and generates a first RLC status report corresponding to the RLC2 according to the first part of the RLC2 downlink RLC PDU and the second part of the downlink RLC PDU.
- the UE sends a first RLC status report to the micro base station.
- the UE may send a first RLC status report to the micro base station.
- the micro base station retransmits the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU to the UE.
- the RLC1 and the RLC2 of the micro base station may respectively determine which RLC PDUs in the corresponding second partial downlink RLC PDUs need to be retransmitted according to the corresponding first RLC status report.
- the RLC1 and the RLC2 of the micro base station can retransmit the corresponding corresponding numbers to the UE respectively.
- the micro base station sends a first RLC status report to the macro base station.
- the macro base station retransmits, to the UE, the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU according to the first RLC status report.
- the macro base station retransmits the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU to the UE.
- the first base station may be caused to update the RLC AM transmission window and the corresponding state variable to continue to transmit the new RLC PDU.
- the RLC1 and RLC2 of the macro base station may be respectively according to the corresponding first
- the RLC status report determines which RLC PDUs in the corresponding first part of the downlink RLC PDU need to be retransmitted.
- the RLC1 and the RLC2 of the macro base station may retransmit the RLC PDUs that need to be retransmitted in the corresponding first part of the downlink RLC PDUs to the UE respectively.
- For the RLC PDUs that need to be retransmitted in the second part of the downlink RLC PDU if the number of retransmissions of the micro base station reaches the predetermined number of times but has not reached the maximum number of retransmissions, it can be processed as described in FIG. In order to avoid repetition, it will not be repeated here.
- the UE may send a first RLC status report corresponding to the RLC1 to the macro base station, and send a first RLC status report corresponding to the RLC2 to the micro base station; or the UE may separately send the RLC1 corresponding to the micro base station.
- the first RLC status report sends a first RLC status report corresponding to the RLC2 to the macro base station.
- step 1603 can be performed in parallel with step 1604 to step 1605, or step 1604 and step 1605 can be performed first, followed by step 1603.
- FIG. 17 is a schematic flow chart of a process of a method of transmitting data according to an embodiment of the present invention.
- Fig. 17 the data transmission process in the uplink direction in step 611 of Fig. 6 will be described in detail.
- the UE sends a Buffer Status Report (BSR) to the macro base station.
- BSR Buffer Status Report
- the UE may send a BSR to the macro base station.
- the UE may also go to the micro when the micro base station has available uplink resources.
- the base station sends a BSR.
- the UE can send at most one BSR (regular BSR) or periodic BSR (cyclic BSR) type BSR. If the macro base station and the micro base station all allocate uplink grants to the UE, the UE can only send one regular BSR or periodic BSR to the macro base station or the micro base station, but cannot simultaneously transmit to the macro base station and the micro base station.
- BSR regular BSR
- cyclic BSR periodic BSR
- the BSR reflects the amount of data available for all logical channels in each logical channel group (LCG) of the UE after a MAC PDU is generated. Usually, there are at most 4 logical channel groups. There are two ways to determine the buffer size level in each LCG in the BSR, including the BSR and the extended BSR, where the BSR or extended BSR can be configured by RRC.
- the BSR format can be classified into long BSR (long BSR), short BSR (short BSR) or truncated.
- Long BSR can contain the buffer data volume of 4 LCGs, and the buffer size corresponding to each logical channel group contains the total amount of data available in all logical channels in the logical channel group, including The amount of data to be transmitted of the RLC layer and the PDCP layer.
- the type of the BSR or the extended BSR can be classified into a regular BSR, a periodic BSR, and a padding BSR.
- the regular BSR is triggered.
- the periodic BSR timer expires, The periodic BSR is triggered.
- the uplink resource allocated by the UE has a padding bit after accommodating the MAC SDU, the padding bit may be carried in the padding bit.
- the regular BSR and the periodic BSR have higher priority than the padding BSR.
- the macro base station allocates an uplink resource to the UE according to the BSR.
- the macro base station can determine the amount of data to be offloaded according to the DRB offload policy and the QoS parameter configuration determined or negotiated in advance.
- the uplink resource is allocated to the UE according to the amount of data, the radio condition, or the QoS parameter that is offloaded to the base station.
- the macro base station sends a first uplink grant (UL grant) information to the UE, where the first uplink grant information indicates an uplink resource allocated by the macro base station to the UE.
- UL grant uplink grant
- the macro base station After allocating the uplink resource to the UE, the macro base station sends the first uplink grant information to the UE by using a physical downlink control channel (PDCCH).
- PDCH physical downlink control channel
- the macro base station sends a BSR to the micro base station.
- the macro base station can forward the BSR to the micro base station through the X2 interface or the direct connection.
- the macro base station may modify the buffer data amount of the corresponding logical channel group in the BSR according to the amount of data to be shunted to the micro base station, and send the modified BSR to the micro base station.
- the macro base station may indicate, in the foregoing X2 interface message, whether the sent BSR is an original BSR or a modified BSR. Or pre-negotiate whether to send the original BSR or the modified BSR.
- the micro base station allocates an uplink resource to the UE according to the BSR.
- the amount of data to be shunted by the micro base station may be determined according to the pre-determined or negotiated DRB offload policy and the QoS parameter configuration, and the buffer data of the corresponding logical channel group in the original BSR may be modified. the amount.
- the BSR received by the micro base station is a modified BSR
- the amount of buffer data of the corresponding logical channel group can be directly used, and the uplink resource is allocated to the UE according to the buffer data amount, the radio condition, and the QoS parameter.
- the micro base station sends the second uplink grant information to the UE, where the second uplink grant information indicates the uplink resource allocated by the micro base station to the UE. .
- the micro base station may send the second uplink grant information to the UE through the PDCCH.
- the UE determines, according to the first uplink grant information and the second uplink grant information, an amount of data to be sent for each logical channel.
- the UE may determine, according to the logical channel priority processing procedure, the amount of data to be sent of each logical channel on the uplink grant of the PCell and/or the SCell according to the first uplink grant information and the second uplink grant information.
- the uplink RLC PDU size is indicated by the MAC to RLC1 and/or RLC2.
- the MAC layer may indicate the total size of one or more upstream RLC PDUs that the RLC layer is to generate.
- the UE generates an uplink RLC PDIL
- the RLC layer of the UE may process the uplink RLC PDU according to the uplink RLC PDU size indicated by the MAC layer, and process the uplink RLC PDU by segmenting, cascading, and adding RLC SN.
- RLCl and RLC2 respectively generate different uplink RLC PDUs.
- one or more different uplink RLC PDUs may be generated in RLC1 and RLC2, or an uplink RLC PDU may be generated only by RLC1 or RLC2.
- the UE sends a first part of the uplink RLC PDU in the uplink RLC PDU to the macro base station on the PCell.
- the RLCl and RLC2 of the UE may forward the uplink RLC PDU generated according to the MAC indication to the MAC as the uplink MAC SDIL.
- an uplink MAC PDU or a TB is generated.
- the RLC PDUs in RLCl and RLC2 can be multiplexed in the same TB.
- the TB generated by the MAC for HARQ1 is delivered to PHY1, and the physical uplink shared channel of PHY1 at PCell (Physical uplink shared Channel, PUSCH) is sent to the macro base station.
- PCell Physical uplink shared Channel
- the UE sends a second part of the uplink RLC PDU in the uplink RLC PDU to the micro base station on the Scell.
- the MAC of the UE is delivered to the PHY2 for the HARB2 generated TB, and is sent by the PHY2 to the micro base station on the PUSCH of the SCell.
- the micro base station sends a second part of the uplink RLC PDIL to the macro base station.
- the micro base station will receive the data received on the PUSCH of the SCell, and after processing by PHY2 and MAC2, deliver the MAC SDU, that is, the RLC PDU, to RLCl and RLC2, and store them in the receiving buffers corresponding to RLCl and RLC2.
- the micro base station does not need to maintain the RLC AM receive window and perform re-ordering functions.
- the micro base station can transmit the second partial uplink RLC PDU to the macro base station through X2 or a direct connection.
- the macro base station receives the RLC PDUs from the micro base station and stores them in the receive buffers corresponding to RLCl, RLC2.
- the macro base station receives the first part of the uplink RLC PDU and the second part of the uplink RLC PDU, and reassembles the first part of the uplink RLC PDU and the second part of the uplink RLC PDU.
- the macro base station can process the data received from the UE on the PUSCH of the PCell, and after processing the PHY1 and the MAC1, the MAC SDU, that is, the first part of the uplink RLC PDU, is delivered to the RLC1 and the RLC2, and is stored in the receiving buffers corresponding to the RLC1 and the RLC2.
- the macro base station may also receive the second partial uplink RLC PDU received from the micro base station and store it in the receive buffers corresponding to RLC1 and RLC2.
- the macro base station may reassemble the first part of the uplink RLC PDU and the second part of the uplink RLC PDU according to the integrated reception condition in the RLC1 and RLC2 receive buffers, and submit the same to the PDCP layer in ascending order according to the RLC SN.
- RLC1 and RLC2 may perform a corresponding RLC PDU receiving process according to the RLC mode being RLC UM or RLC AM (each RLC entity is one of two RLC modes), and deliver the successfully received uplink RLC PDUs to the PDCP layer in ascending order of RLC SN. .
- the base station can forward the received BSR to the macro base station.
- the time information may be time stamp information or system frame number (SFN) and sub-frame (frame) information of the PCell or SCell.
- the method for the UE to send the BSR may be: when both the PCell provided by a cryptographic macro base station and the SCell provided by the micro base station are allocated with uplink resources, the UE simultaneously sends a regular BSR or a periodic BSR on the PCell and the SCell, and A flag indicating whether forwarding is required in the BSR, and the flag is set to not need to be forwarded. It is required that the BSRs sent simultaneously on PCell and SCell have the same buffer size level value for the same LCG.
- the UE can only send one regularity in the uplink resources of all CCs of the macro base station.
- a BSR or a periodic BSR can only send one regular BSR or periodic BSR in the uplink resources of all CCs of the micro base station.
- FIG. 18 is a schematic flowchart of an uplink data retransmission process according to an embodiment of the present invention.
- Fig. 18 the retransmission process of the uplink RLC PDU for RLC AM in Fig. 17 will be described in detail.
- the macro base station receives the first part of the uplink RLC PDU and the second part of the uplink RLC PDU, and generates a second RLC status report according to the receiving status of the first part of the uplink RLC PDU and the second part of the uplink RLC PDU.
- the macro base station sends a second RLC status report to the UE.
- the UE determines an uplink retransmission set according to the second RLC status report.
- the uplink retransmission set includes RLC PDUs that need to be retransmitted in the first part of the uplink RLC PDU and/or RLC PDUs that need to be retransmitted in the second part of the uplink RLC PDU.
- the UE may update the RLC AM transmission window and the corresponding state variable to continue to send the new RLC PDIL when the macro base station indicates that the successfully received RLC PDU is received in the second RLC status report according to the second RLC status report.
- the UE may divide the uplink retransmission set into a first uplink retransmission sub-set and a second uplink re-transmission sub-set according to the first uplink grant information of the PCell and/or the second uplink grant information on the SCell, and determine to the macro base station. Retransmitting the first uplink retransmission sub-set and retransmitting the second uplink retransmission sub-set to the micro base station.
- the UE retransmits the RLC PDU of the first uplink retransmission sub-set to the macro base station.
- FIG. 19 is a schematic flowchart of an uplink data retransmission process according to an embodiment of the present invention. In Fig. 19, the retransmission process of the uplink RLC PDU for RLC AM in Fig. 17 will be described in detail.
- Steps 1901 to 1903 in Fig. 19 are similar to steps 1801 to 1803 in Fig. 18. To avoid repetition, details are not described herein.
- the UE sends an RLC PDIL of the uplink retransmission set to the macro base station.
- the UE may determine to retransmit all uplink RLC PDUs that need to be retransmitted to the macro base station according to the first uplink grant information of the PCell and/or the second uplink grant information on the SCell.
- FIG. 20 is a schematic flowchart of an uplink data retransmission process according to an embodiment of the present invention.
- Fig. 20 the retransmission process of the uplink RLC PDU for RLC AM in Fig. 17 will be described in detail.
- Steps 2001 to 2003 in Fig. 20 are similar to steps 1801 to 1803 in Fig. 18. To avoid repetition, details are not described herein.
- the UE sends an RLC PDU of the uplink retransmission set to the micro base station.
- the UE may determine to retransmit all uplink RLC PDUs that need to be retransmitted to the micro base station according to the first uplink grant information of the PCell and/or the second uplink grant information on the SCell.
- the micro base station sends an RLC PDIL of the uplink retransmission set to the macro base station.
- the micro base station can send the uplink RLC PDU that needs to be retransmitted to the macro base station through the X2 interface or the direct connection.
- FIG. 21 is a schematic flowchart of a process of RRC connection re-establishment according to an embodiment of the present invention.
- the first base station may be one of a macro base station and a base station
- the second base station may be another base station.
- the UE sends an RRC connection re-establishment request message to the macro base station.
- RLF Radio Link Failure
- the UE can perform cell selection. If the PCell radio condition is good, the PCell is still selected. . Then, the UE sends an RRC connection re-establishment request message to the macro base station, and initializes an RRC connection re-establishment procedure, including suspend all RBs except SRB0, resets the MAC, uses the default physical channel configuration, and uses the default MAC layer master. Configuration (MAC main configuration), etc. Different from the prior art, when the RRC connection is re-established, the SCell provided by the micro base station may not be released.
- the macro base station sends a re-establishment notification message to the base station.
- the re-establishment notification message may include a DRB related parameter, and may indicate that the micro base station hangs Divided DRB.
- the micro base station suspends the diverted DRB according to the re-establishment notification message, and reconfigures the DRB related parameters.
- the Acer station sends an RRC Connection Reestablishment (RRCConnectionReestablishment) message to the UE.
- RRCConnectionReestablishment RRC Connection Reestablishment
- the UE re-establishes a message according to the RRC connection, re-establishes the PDCP entity and the RLC entity of the SRB1, performs a radio resource configuration process, and restores the SRB1.
- the UE sends an RRC Connection Reestablishment Complete (RRCConnectionReestablishmentComplete) message to the Acer station.
- RRCConnectionReestablishmentComplete RRC Connection Reestablishment Complete
- the macro base station sends an RRC connection re-establishment complete message to the micro base station.
- step 2102 may be performed in parallel with steps 2103 through 2104, or step 2103 and step 2104 may be performed first, followed by step 2102.
- FIG 22 is a schematic block diagram of a base station in accordance with an embodiment of the present invention.
- the base station 2200 of Fig. 22 is the first base station described above.
- the base station 2200 includes a generating unit 2201 and a transmitting unit 2202.
- the generating unit 2201 generates an RLC PDUo sending unit 2202, and sends a first partial downlink RLC PDU in the downlink RLC PDU to the UE, and sends a second partial downlink RLC PDU in the downlink RLC PDU to the second base station, so that the second base station sends the second RLC PDU to the UE. Two parts of the downlink RLC PDU.
- the first part of the downlink RLC in the downlink RLC PDU is sent to the UE.
- the base station 2200 may further include a first receiving unit 2203.
- the first receiving unit 2203 may receive, from the UE, a first partial uplink RLC PDU in the uplink RLC PDU generated by the UE, and receive a second partial uplink RLC PDU in the uplink RLC PDU from the second base station, where the second partial uplink RLC PDU is the first
- the second base station receives from the UE.
- the base station 2200 may further include a second receiving unit 2204.
- the second receiving unit 2204 can receive the first RLC status report from the UE.
- the sending unit 2202 can When the first RLC status report indicates the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU, the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU is retransmitted to the UE.
- the sending unit 2202 may further forward the first RLC status report to the second base station, where the first RLC status indicator indicates that the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU or sends the first base station to the second base station according to the first RLC status report.
- the generated retransmission message indicates the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU.
- the base station 2200 may further include a third receiving unit 2205 and a first determining unit 2206.
- the third receiving unit 2205 may receive a first RLC status report from the second base station, where the first RLC status report is received by the second base station from the UE.
- the first determining unit 2206 may determine, according to the first RLC status, an RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU;
- the sending unit 2202 may also retransmit the RLC PDU in the first part of the downlink RLC PDU that needs to be retransmitted to the UE.
- the base station 2200 may further include a fourth receiving unit 2207.
- the generating unit 2201 may further generate a second RLC status report according to the receiving status of the first partial uplink RLC PDU and the second partial uplink RLC PDU.
- the sending unit 2202 can also send a second RLC status report to the UE.
- the fourth receiving unit 2207 may receive the RLC PDU of the uplink retransmission set determined by the UE according to the second RLC status report, where the uplink retransmission set includes the RLC PDU and/or the second partial uplink RLC PDU that need to be retransmitted in the first partial uplink RLC PDU.
- the RLC PDU that needs to be retransmitted may be received.
- the fourth receiving unit 2207 may receive the RLC PDU of the uplink retransmission set from the UE; or receive the RLC PDU of the first uplink retransmission subset from the UE, and receive the second from the second base station.
- the RLC PDU in the uplink retransmission sub-set where the RLC PDU of the second uplink retransmission sub-set is received by the second base station from the UE, and the first uplink retransmission sub-set and the second uplink re-transmission sub-set are uplinked by the UE Retransmitting the set of the retransmission; or receiving the RLC PDU of the retransmission set from the second base station, where the RLC PDU of the uplink retransmission set is received by the second base station from the UE.
- the sending unit 2202 may send the first partial downlink RLC PDU to the UE on the first cell of the base station 2200, and send the second partial downlink RLC PDU to the second base station, so that the second base station is in the second base station. Sending the second part of the downlink to the UE on the second cell of the second base station The RLC PDU, where the coverage of the first cell and the second cell overlap.
- the base station 2200 may further include a fifth receiving unit 2208, where the sending unit 2202 may further send a first request message to the second base station, where the first request message is used to indicate that the second base station is configured for the UE. Two cells.
- the fifth receiving unit 2208 may receive a first response message from the second base station, where the first response message carries resource information of the second cell determined by the second base station according to the first request message.
- the sending unit 2202 may further send a radio resource control RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration message carries the resource information of the second cell.
- the first request message may be further used to indicate that the second base station establishes a DRB for the UE.
- the base station 2200 may further include a sixth receiving unit 2209 and a second determining unit 2210.
- the sixth receiving unit 2209 may receive a second request message from the second base station, where the second request message is used to instruct the base station 2200 to configure the first cell for the UE.
- the second determining unit 2210 may determine resource information of the first cell according to the second request message.
- the sending unit 2201 may further send a second response message to the second base station, where the second response message carries the resource information of the first cell, so that the second base station notifies the UE of the resource information of the first cell.
- the base station 2200 may further include an establishing unit 2211.
- the second request message may also be used to indicate that the base station establishes a DRB for the UE, and the establishing unit 2211 may establish a PDCP entity, an RLC entity, and a logical channel corresponding to the DRB according to the second request message.
- the second request message may also be used to indicate that the base station 2200 is responsible for data offloading.
- the sending unit 2202 may further send a path switch request message to the MME according to the second request message, so that the MME requests the serving gateway to switch the data transmission path to the path of the serving gateway to the base station 2200 according to the path switch request message.
- the first receiving unit to the sixth receiving unit may be the same receiving unit or the same receiving unit.
- the actions of the first to sixth receiving units can be performed by one receiver.
- the base station 2300 is the above-described second base station.
- the base station 2300 includes a receiving unit 2310 and a transmitting unit 2320.
- the receiving unit 2310 receives, from the first base station, the second one of the downlink RLC PDUs generated by the first base station. Partial downlink RLC PDU.
- the sending unit 2320 transmits a second partial downlink RLC PDU to the UE. In the embodiment of the present invention, by transmitting the second partial downlink RLC PDU in the downlink RLC PDU generated by the first base station to the UE, the peak rate and throughput of the UE can be improved.
- the receiving unit 2310 may further receive, from the UE, a second partial uplink RLC PDU in the uplink RLC PDU generated by the UE.
- the transmitting unit 2320 may also send a second partial uplink RLC PDU to the first base station.
- the base station 2300 may further include a first determining unit 2330.
- the receiving unit 2310 may receive a first RLC status report from the first base station, where the first determining unit
- the 2330 may determine, according to the first RLC status report, the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU, and the sending unit 2320 may further retransmit the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU.
- the receiving unit 2310 may further receive a retransmission message from the first base station, and the sending unit 2320 may further retransmit the RLC PDU in the second part of the downlink RLC PDU that needs to be retransmitted according to the retransmission message, where the first retransmission message indicates The second part of the RLC PDU that needs to be retransmitted in the downlink RLC PDU.
- the receiving unit 2310 may further receive a first RLC status report from the UE.
- the sending unit 2320 may further forward the first RLC status report to the first base station, where the first base station may retransmit the first part of the downlink to the UE when the first RLC status report indicates the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU. RLC PDUs that need to be retransmitted in the RLC PDU.
- the sending unit 2320 may also retransmit the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU to the UE when the first RLC status report indicates the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU.
- the receiving unit 2310 may further receive an RLC PDU of an uplink retransmission set from the UE, and the sending unit 2320 may further send an RLC PDU of the uplink retransmission set to the first base station, where the uplink retransmission set includes The RLC PDU that needs to be retransmitted in a part of the uplink RLC PDU and/or the RLC PDU that needs to be retransmitted in the second partial uplink RLC PDU.
- the receiving unit 2310 may further receive the RLC PDU of the second uplink retransmission sub-set from the UE, and the sending unit 2320 may further send the RLC PDU of the second uplink retransmission sub-set to the first base station, where the second uplink re-transmission sub-set is The UE divides the uplink retransmission set.
- the sending unit 2320 may send the second partial downlink RLC PDU to the UE on the second cell of the base station 2300.
- the base station 2300 may further include a second determining unit 2340.
- the receiving unit 2340 may further receive a first request message from the first base station, where the first request message is used to indicate that the base station configures the second cell for the UE.
- the second determining unit 2340 may determine resource information of the second cell according to the first request message.
- the sending unit 2320 may further send a first response message to the first base station, where the first response message carries the resource information of the second cell, so that the first base station notifies the UE of the resource information of the second cell.
- the base station 2300 may further include an establishing unit 2350.
- the first request message may also be used to instruct the base station 2300 to establish a DRB for the UE.
- the establishing unit 2350 may establish an RLC entity and a logical channel corresponding to the DRB according to the first request message.
- the sending unit 2320 may further send a second request message to the first base station, where the second request message is used to indicate that the first base station configures 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, where the second response message carries resource information of the first cell determined by the first base station according to the second request message.
- the sending unit 2320 may further send a radio resource control RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration message carries the resource information of the first cell.
- the second request message is further used to indicate that the first base station establishes a mess for the UE.
- FIG. 24 is a schematic block diagram of a UE in accordance with an embodiment of the present invention.
- UE 2400 includes a receiving unit
- the receiving unit 2410 receives, from the first base station, the first partial downlink RLC PDU in the downlink RLC PDU generated by the first base station, and receives the second partial downlink RLC PDU in the downlink RLC PDU from the second base station, where the second partial downlink RLC PDU is The second base station receives from the first base station.
- the first generating unit 2420 reassembles the first partial downlink RLC PDU and the second partial downlink RLC PDU to form a downlink RLC SDU.
- the UE receives the first part of the downlink RLC PDU in the downlink RLC PDU from the first base station, and receives the second part of the downlink RLC PDU obtained by the second base station from the first base station from the second base station, so that the UE can
- the two base stations transmit data together, thereby increasing the peak rate and throughput of the UE.
- the UE 2400 may further include a first sending unit 2430.
- the first generating unit 2420 can generate an uplink RLC PDU.
- the first sending unit 2440 may send the first partial uplink RLC PDU in the uplink RLC PDU to the first base station, and send the second partial uplink RLC PDU in the uplink RLC PDU to the second base station.
- the UE 2400 may further include a second generating unit 2440 and a second sending unit 2450.
- the second generating unit 2440 may generate a first RLC status report according to the receiving status of the first partial downlink RLC PDU and the second partial downlink RLC PDU, where the first RLC status report indicates that the RLC PDU and the RLC PDU that need to be retransmitted in the first part of the downlink RLC PDU are Or the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU.
- the second sending unit 2450 may send the first RLC status report to the first base station or the second base station.
- the receiving unit 2410 may further receive, from the first base station, the RLC PDU that needs to be retransmitted in the first partial downlink RLC PDU and/or receive the RLC PDU that needs to be retransmitted in the second partial downlink RLC PDU from the second base station.
- the UE 2400 may further include a determining unit 2460 and a third sending unit 2470.
- the receiving unit 2410 can also receive a second RLC status report from the first base station.
- the determining unit 2460 may determine, according to the second RLC status report, an uplink retransmission set, where the uplink retransmission set includes an RLC PDU that needs to be retransmitted in the first partial uplink RLC PDU and/or an RLC PDU that needs to be retransmitted in the second partial uplink RLC PDU. .
- the third sending unit 2470 may send the RLC PDU of the uplink retransmission set to the first base station, or send the RLC PDU of the uplink retransmission set to the second base station, or send the RLC PDU of the first uplink retransmission subset to the first base station. And transmitting, by the second base station, the RLC PDU of the second uplink retransmission sub-set, where the first uplink retransmission sub-set and the second uplink re-transmission sub-set are obtained by the UE dividing the uplink retransmission set.
- the receiving unit 2410 may receive the first partial downlink RLC PDU from the first cell of the first base station, and receive the second partial downlink RLC PDU from the second cell of the second base station, where the first cell There is overlap with the coverage of the second cell.
- the receiving unit 2410 may further receive the wireless from the first base station.
- the resource control RRC connection reconfiguration message, and the RRC connection reconfiguration message carries the resource information of the second cell determined by the second base station.
- the receiving unit 2410 may further receive an RRC connection reconfiguration message from the second base station, where the RRC connection reconfiguration message carries resource information of the first cell determined by the first base station.
- the foregoing first sending unit to the third sending unit may be the same sending unit or the same sending unit.
- the actions of the first to third transmitting units can be performed by one transmitter.
- FIG. 25 is a schematic block diagram of a base station in accordance with an embodiment of the present invention.
- the base station 2500 of Fig. 25 is the first base station.
- Base station 2500 includes a processor 2510 and a transmitter 2520.
- the processor 2510 generates an RLC PDU.
- the transmitter 2520 sends the first partial downlink RLC PDU in the downlink RLC PDU to the UE, and sends the second partial downlink RLC PDU in the downlink RLC PDU to the second base station, so that the second base station sends the second partial downlink RLC PDU to the UE.
- the first part of the downlink RLC PDU in the downlink RLC PDU is sent to the UE, and 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 the second part of the downlink to the UE.
- the RLC PDU enables two base stations to jointly transmit data to the UE, thereby improving the peak rate and throughput of the UE.
- the base station 2500 may further include a receiver 2530.
- the receiver 2530 may receive, from the UE, a first partial uplink RLC PDU in the uplink RLC PDU generated by the UE, and receive a second partial uplink RLC PDU in the uplink RLC PDU from the second base station, where the second partial uplink RLC PDU is the second base station Received from the UE.
- the receiver 2530 may receive the first RLC status report from the UE.
- the transmitter 2520 may retransmit the RLC PDU in the first part of the downlink RLC PDU that needs to be retransmitted to the UE when the first RLC status report indicates the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU.
- the transmitter 2520 may further forward the first RLC status report to the second base station, where the first RLC status report indicates the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU, or sends the first base station according to the first RLC status to the second base station.
- the retransmission message generated by the report is reported, and the retransmission message indicates the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU.
- the receiver 2530 may receive a first RLC status report from the second base station, where the first RLC status report is received by the second base station from the UE.
- the processor 2510 may determine, according to the first RLC status report, an RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU.
- the transmitter 2520 may also retransmit the first part of the downlink RLC PDU to the UE that needs to be retransmitted.
- the processor 2510 may further generate a second RLC status report according to the receiving status of the first partial uplink RLC PDU and the second partial uplink RLC PDU.
- the transmitter 2520 can also send a second RLC status report to the UE.
- the receiver 2530 may receive the RLC PDU of the uplink retransmission set determined by the UE according to the second RLC status report, where the uplink retransmission set includes the RLC PDU to be retransmitted in the first partial uplink RLC PDU and/or the second part of the uplink RLC PDU. Retransmitted RLC PDU.
- the receiver 2530 may receive the RLC PDU of the uplink retransmission set from the UE, or receive the RLC PDU of the first uplink retransmission sub-set from the UE, and receive the second uplink weight from the second base station. And the RLC PDU in the second set of the retransmission sub-set is received by the second base station from the UE, and the first uplink retransmission sub-set and the second uplink re-transmission sub-set are retransmitted by the UE. The RLC PDU of the uplink retransmission set is received by the second base station, and the RLC PDU of the uplink retransmission set is received by the second base station from the UE.
- the transmitter 2520 may send the first partial downlink RLC PDU to the UE on the first cell of the base station 2500, and send the second partial downlink RLC PDU to the second base station, so that the second base station is in the second base station.
- a second part of the downlink RLC PDU is sent to the UE on the second cell of the second base station, where the coverage of the first cell and the second cell overlap.
- the transmitter 2520 may further send a first request message to the second base station, where the first request message is used to indicate that the second base station configures the second cell for the UE.
- the receiver 2530 may receive a first response message from the second base station, where the first response message carries resource information of the second cell determined by the second base station according to the first request message.
- the transmitter 2520 may further send a radio resource control RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration message carries resource information of the second cell.
- the first request message may be further used to indicate that the second base station establishes a DRB for the UE.
- the receiver 2530 may receive the second request from the second base station.
- the second request message is used to instruct the base station 2500 to configure the first cell for the UE.
- the processor 2510 may determine resource information of the first cell according to the second request message.
- the transmitter 2520 may further send a second response message to the second base station, where the second response message carries the resource information of the first cell, so that the second base station notifies the UE of the resource information of the first cell.
- the second request message may be further used to indicate that the base station establishes a DRB for the UE.
- the processor 2510 may establish, according to the second request message, a PDCP entity corresponding to the DRB,
- the second request message may also be used to indicate that the base station 2200 is responsible for data offloading.
- the transmitter 2520 may further send a path switch request message to the MME according to the second request message, so that the MME requests the serving gateway to switch the data transmission path to the path of the service gateway to the base station 2500 according to the path switch request message.
- Base station 2600 is the second base station described above.
- Base station 2600 includes a receiver 2610 and a transmitter 2620.
- the receiver 2610 receives, from the first base station, a second partial downlink RLC PDU of the downlink RLC PDUs generated by the first base station.
- Transmitter 2620 sends a second portion of the downlink RLC PDU to the UE.
- the peak rate and throughput of the UE can be improved.
- the receiver 2610 may further receive, from the UE, a second partial uplink RLC PDU in the uplink RLC PDU generated by the UE.
- Transmitter 2620 can also transmit a second portion of the uplink RLC PDU to the first base station.
- the base station 2600 may further include a processor 2630.
- the receiver 2610 may receive the first RLC status report from the first base station, and the processor 2630 may determine, according to the first RLC status report, the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU, and the transmitter 2620 may also retransmit to the UE.
- the receiver 2610 may further receive a retransmission message from the first base station, and the transmitter 2620 may further retransmit the RLC PDU in the second part of the downlink RLC PDU that needs to be retransmitted according to the retransmission message, where the first retransmission message indicates The second part of the RLC PDU that needs to be retransmitted in the downlink RLC PDU.
- the receiver 2610 may further receive a first RLC status report from the UE.
- the transmitter 2620 may further forward the first RLC status report to the first base station, where the first base station retransmits the first part of the downlink RLC to the UE when the first RLC status report indicates the RLC PDU that needs to be retransmitted in the first part of the downlink RLC PDU.
- the RLC PDU that needs to be retransmitted in the PDU may also retransmit the RLC PDU in the second partial downlink RLC PDU that needs to be retransmitted to the UE when the first RLC status report indicates the RLC PDU that needs to be retransmitted in the second part of the downlink RLC PDU.
- the receiver 2610 may further receive an RLC PDU of an uplink retransmission set from the UE, and the transmitter 2620 may further send an RLC PDU of the uplink retransmission set to the first base station, where the uplink retransmission set includes The RLC PDU that needs to be retransmitted in a part of the uplink RLC PDU and/or the RLC PDU that needs to be retransmitted in the second partial uplink RLC PDU.
- the receiver 2610 may further receive the RLC PDU of the second uplink retransmission sub-set from the UE, and the transmitter 2620 may further send the RLC PDU of the second uplink retransmission sub-set to the first base station, where the second uplink re-transmission sub-set is The UE divides the uplink retransmission set.
- the transmitter 2620 may send the second partial downlink RLC PDU to the UE on the second cell of the base station 2600.
- the receiver 2610 may further receive a first request message from the first base station, where the first request message may be used to indicate that the base station configures the second cell for the UE.
- the processor 2630 may determine resource information of the second cell according to the first request message.
- the transmitter 2620 may further send a first response message to the first base station, where 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.
- the first request message is further used to instruct the base station 2600 to establish a DRB for the UE.
- the processor 2630 can establish an RLC entity and a logical channel corresponding to the DRB according to the first request message.
- the transmitter 2620 may further send a second request message to the first base station, where the second request message is used to indicate that the first base station configures 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, where the second response message carries resource information of the first cell determined by the first base station according to the second request message.
- the transmitter 2620 may further send a radio resource control RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration message carries resource information of the first cell.
- the second request message is further used to indicate that the first base station is built for the UE. D chaos
- FIG. 27 is a schematic block diagram of a UE in accordance with an embodiment of the present invention.
- the UE 2700 includes a receiver 2710 and a processor 2720.
- the receiver 2710 receives, from the first base station, a first partial downlink RLC PDU in the downlink RLC PDU generated by the first base station, and receives a second partial downlink RLC PDU in the downlink RLC PDU from the second base station, where the second partial downlink RLC PDU is The second base station receives from the first base station.
- the processor 2720 reassembles the first partial downlink RLC PDU and the second partial downlink RLC PDU to form a downlink RLC SDU.
- the UE receives the first partial downlink RLC PDU in the downlink RLC PDU from the first base station, and receives the second partial downlink RLC PDU obtained by the second base station from the first base station from the second base station, so that the UE can
- the two base stations transmit data together, thereby increasing the peak rate and throughput of the UE.
- the UE 2400 may further include a transmitter 2730. processor
- the 2720 can generate an uplink RLC PDU.
- the transmitter 2730 may send the first partial uplink RLC PDU in the uplink RLC PDU to the first base station, and send the second partial uplink RLC PDU in the uplink RLC PDU to the second base station.
- the processor 2720 may generate a first RLC status report according to the receiving status of the first partial downlink RLC PDU and the second partial downlink RLC PDU, where the first RLC status report indicates the first part of the downlink RLC PDU.
- Transmitter 2730 can send a first RLC status report to the first base station or the second base station.
- the receiver 2710 may also receive, from the first base station, RLC PDUs that need to be retransmitted in the first partial downlink RLC PDU and/or receive RLC PDUs that need to be retransmitted in the second partial downlink RLC PDU from the second base station.
- the receiver 2710 may also receive a second RLC status report from the first base station.
- the processor 2720 may determine, according to the second RLC status report, an uplink retransmission set, where the uplink retransmission set includes an RLC PDU that needs to be retransmitted in the first partial uplink RLC PDU and/or an RLC PDU that needs to be retransmitted in the second partial uplink RLC PDU. .
- the transmitter 2730 may send the RLC PDU of the uplink retransmission set to the first base station, or send the RLC PDU of the uplink retransmission set to the second base station, or send the RLC PDU of the first uplink retransmission subset to the first base station and
- the second base station sends the RLC PDU of the second uplink retransmission sub-set, where the first uplink retransmission sub-set and the second uplink re-transmission sub-set are obtained by the UE dividing the uplink retransmission set.
- the receiver 2710 may receive the first partial downlink RLC PDU from the first cell of the first base station, and receive the second partial downlink RLC PDU from the second cell of the second base station, where the first cell There is overlap with the coverage of the second cell.
- the receiver 2710 may further receive a radio resource control RRC connection reconfiguration message from the first base station, where the RRC connection reconfiguration message carries resource information of the second cell determined by the second base station.
- the receiver 2710 may further receive an RRC connection reconfiguration message from the second base station, where the RRC connection reconfiguration message carries the resource information of the first cell determined by the first base station.
- the UE receives the first part of the downlink RLC PDU in the downlink RLC PDU from the first base station, and receives the second part of the downlink RLC PDU obtained by the second base station from the first base station from the second base station, which can improve the UE. Peak rate and throughput.
- the base station 2800 of Figure 28 can be the first base station described above.
- the base station 2800 includes a receiving unit 2810 and a recombining unit 2820.
- the receiving unit 2810 receives, from the UE, the first part of the uplink RLC PDU generated by the UE.
- Reassembly unit 2820 reassembles the first portion of the uplink RLC PDU and the second portion of the RLC PDU.
- the first part of the uplink RLC PDU in the uplink RLC PDU generated by the UE is received from the UE, and the second part of the uplink RLC PDU is received from the second base station.
- the RLC PDU enables two base stations to jointly transmit data with the UE, thereby improving the peak rate and throughput of the UE.
- the base station may further include a generating unit 2830 and a sending unit.
- the generating unit 2830 may be configured according to the first part uplink RLC PDU and the second part uplink RLC
- the receiving status of the PDU generates a second RLC status report.
- the sending unit 2840 can send a second RLC status report to the UE.
- the receiving unit 2810 may receive the RLC PDU of the uplink retransmission set determined by the UE according to the second RLC status report, where the uplink retransmission set includes the RLC PDU and/or the second partial uplink RLC PDU in the first partial uplink RLC PDU that needs to be retransmitted.
- the RLC PDU that needs to be retransmitted The RLC PDU that needs to be retransmitted.
- the receiving unit 2810 may receive the RLC PDIL of the uplink retransmission set from the UE, or the receiving unit 2810 may receive the RLC PDU of the first uplink retransmission subset from the UE, and from the second The base station receives the RLC PDU in the second uplink retransmission sub-set, where the RLC PDU of the second uplink retransmission sub-set is received by the second base station from the UE, and the first uplink retransmission sub-set and the second uplink re-transmission sub-set are It is obtained by the UE dividing the uplink retransmission set.
- the receiving unit 2810 may receive an RLC PDU that uploads a retransmission set from the second base station, where the RLC PDU of the uplink retransmission set is received by the second base station from the UE.
- the base station 2900 of Figure 29 is a schematic block diagram of a base station in accordance with an embodiment of the present invention.
- the base station 2900 of Figure 29 can be the second base station described above.
- the base station 2900 includes a receiving unit 2910 and a transmitting unit 2920.
- the receiving unit 2910 receives, from the UE, the second part of the uplink RLC PDU generated by the UE.
- the transmitting unit 2920 transmits a second partial uplink RLC PDU to the first base station.
- the peak rate and throughput of the UE can be improved.
- the receiving unit 2910 may further receive an RLC PDU of the uplink retransmission set from the UE.
- the sending unit 2920 may further send, to the first base station, an RLC PDU of an uplink retransmission set, where the uplink retransmission set includes an RLC PDU that needs to be retransmitted in the first partial uplink RLC PDU and/or a second part of the uplink RLC PDU that needs to be retransmitted RLC PDU.
- the receiving unit 2910 may receive the RLC PDU of the second uplink retransmission sub-set from the UE, and send the RLC PDU of the second uplink retransmission sub-set to the first base station, where the second uplink re-transmission sub-set is the uplink of the UE Retransmission of the set of partitions.
- FIG. 30 is a schematic block diagram of a UE in accordance with an embodiment of the present invention.
- the UE 3000 includes a generating unit 3010 and a transmitting unit 3020.
- the generating unit 3010 generates an uplink RLC PDU.
- the sending unit 3020 sends the first part of the uplink RLC PDU in the uplink RLC PDU to the first base station, and sends the second part of the uplink RLC PDU in the uplink RLC PDU to the second base station, so that the second base station sends the second part of the uplink to the first base station.
- RLC PDU the UE sends the first part of the uplink RLC PDU in the uplink RLC PDU to the first base station, and sends the second part of the uplink RLC PDU to the second base station, and the second base station sends the second part of the uplink to the first base station.
- the RLC PDU enables the UE to transmit data together with the two base stations, thereby improving the peak rate and throughput of the UE.
- the UE 3000 may further include a receiving unit 3030 and a determining unit 3040.
- the receiving unit 3030 can receive a second RLC status report from the first base station.
- the determining unit 3040 may determine, according to the second RLC status report, an uplink retransmission set, where the uplink retransmission set includes an RLC PDU that needs to be retransmitted in the first partial uplink RLC PDU and/or an RLC PDU that needs to be retransmitted in the second partial uplink RLC PDU. .
- the sending unit 3020 may further send the RLC PDU of the uplink retransmission set to the first base station, or send the RLC PDU of the uplink retransmission set to the second base station, or send the RLC PDU of the first uplink retransmission sub-set to the first base station and
- the second base station sends the RLC PDU of the second uplink retransmission sub-set, where the first uplink retransmission sub-set and the second uplink re-transmission sub-set are obtained by the UE dividing the uplink retransmission set.
- the UE can transmit data to each base station on the cell aggregated by each base station.
- the UE traffic is reduced or the radio conditions of the cells in which the cells are aggregated are deteriorated, the UE also needs to monitor the channels of the cells, which may cause waste of the UE power.
- Embodiments of the present invention provide a method for cell resource management.
- FIG. 31 is a schematic flowchart of a method for cell resource management according to an embodiment of the present invention. The method of Figure 31 is performed by a base station.
- the first base station determines an activation time or a deactivation time of the second cell of the second base station, where the first base station is a primary base station, and the second base station is a secondary base station.
- the first base station is the primary base station, and the second base station is the secondary base station, and then the second cell of the second base station is the SCell.
- the first base station may be a macro base station, and the second base station may be a micro base station.
- the indication signaling may be activation signaling.
- the indication signaling indicates the deactivation time of the second cell, the indication signaling may be deactivation signaling.
- the activation signaling and the deactivation signaling may be a MAC CE (Control Element).
- the first base station separately informs the second base station and the UE of an activation time or a deactivation time of the second cell.
- the first base station sends an indication signaling to the second base station and the UE respectively, where the indication signaling may be used to indicate an activation time or a deactivation time of the second cell.
- the first base station may send indication signaling to the second base station, to The second base station sends indication signaling to the UE, and the indication signaling may be used to indicate an activation time or a deactivation time of the second cell.
- the second base station may send, to the first base station, the unacknowledged RLC PDU or the untransmitted RLC PDU in the RLC transmission buffer of the second cell, and the RLC PDU in the RLC receiving buffer. Or notifying the first base station of the SN of the RLC PDU.
- the activation time or the deactivation time of the second cell of the second base station is determined by the first base station, and the activation time or the deactivation time of the second cell is notified to the UE, so that the UE can activate or deactivate the second The cell can thus save the power of the UE.
- the first base station can ensure that the activation time of the activation or deactivation is consistent between the second base station and the UE by notifying the second base station and the UE of the activation time or the deactivation time of the second cell, respectively.
- the delay of transmitting the indication signaling by the first base station and the second base station on the X2 interface can be solved.
- FIG. 32 is a schematic flowchart of a method for cell resource management according to an embodiment of the present invention. The method of Figure 32 is performed by the UE.
- the UE receives the indication signaling from the first base station or the second base station, where the indication signaling may be used to indicate an activation time or a deactivation time of the second cell of the second base station, where the first base station is the primary base station, and the second base station is The secondary base station, the activation time or the deactivation time of the second cell is determined by the first base station.
- the UE performs an activation operation on the second cell when the activation time arrives, or the UE performs a deactivation operation on the second cell when the deactivation time arrives.
- 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, so that the power of the UE can be saved.
- FIG. 33 is a schematic flowchart of a method for cell resource management according to an embodiment of the present invention. The method of Figure 33 is performed by a base station.
- the second base station determines an activation time or a deactivation time of the second cell of the second base station.
- the second base station notifies the first base station and the UE of the activation time or the deactivation time of the second cell, where the first base station is the primary base station, and the second base station is the secondary base station.
- the first base station is the primary base station, and the second base station is the secondary base station, and then the second cell of the second base station is the SCell.
- the first base station may be a macro base station, and the second base station may be a micro base station.
- the second base station sends indication signaling to the first base station and the UE respectively, where the indication signaling may be used to indicate an activation time or a deactivation time of the second cell.
- the second base station may send the indication signaling to the first base station, so that the first base station sends the indication signaling to the UE, where the indication signaling may be used to indicate the activation time or deactivation of the second cell. time.
- the second base station may send an unacknowledged RLC PDU or an untransmitted RLC PDU in the RLC of the second cell, and an RLC in the RLC receiving buffer.
- the PDU is sent to the first base station, or the first base station is notified of the SN of the RLC PDU.
- the second base station determines the activation time or the deactivation time of the second cell of the second base station, and notifies the UE of the activation time or the deactivation time of the second cell, so that the UE can activate or deactivate the second
- the cell can thus save the power of the UE.
- FIG. 34 is a schematic flowchart of a method for cell resource management according to an embodiment of the present invention. The method of Figure 34 is performed by the UE.
- the UE receives the indication signaling from the second base station or the first base station, where the indication signaling may be used to indicate an activation time or a deactivation time of the second cell of the second base station, where the first base station is the primary base station, and the second base station is The secondary base station, wherein the activation time or the deactivation time of the second cell is determined by the second base station.
- the UE performs an activation operation on the second cell when the activation time arrives, or the UE performs a deactivation operation on the second cell when the deactivation time arrives.
- 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, so that the power of the UE can be saved.
- the UE may further maintain a deactivation timer of the second cell corresponding to the second base station, when the deactivation timer expires, the UE deactivates the second cell of the second base station, and A base station and a second base station send indication signaling, and the indication signaling may be used to indicate that the second cell has been deactivated.
- the first base station may be a primary base station
- the second base station may be a secondary base station.
- the second base station may send, by the second base station, an unacknowledged RLC PDU or an untransmitted RLC PDU in the RLC transmission buffer of the second cell, and an RLC PDU in the RLC receiving buffer.
- a base station or notifying the first base station of the SN of the RLC PDU.
- the first base station is a macro base station and the second base station is a micro base station.
- the macro base station is the primary base station
- the micro base station is the secondary base station.
- the micro base station provides two carriers CC1 and CC2, and the corresponding serving cells are SCelll and SCell2 respectively, and the signaling signals for SCelll and SCell2 can pass through the Acer.
- the PCell on the station and the activated SCelll or SCell2 are sent to the UE.
- PUCCH is configured on SCelll
- SCelll can be deactivated only after SCell2 is deactivated.
- SCelll should also be activated first. In this case, SCelll and SCell2 can also be activated or deactivated simultaneously.
- the RLC PDUs that are offloaded to the RLC1 and RLC2 of the micro base station can all be mapped to SCelll for transmission or reception.
- the unacknowledged RLC PDU in the transmission buffers of the RLC1 and RLC2 of the micro base station needs to be transmitted back to the macro base station, or the SN indicating the RLC PDU corresponding to the macro base station (need to be An original RLC PDU is reserved in the transmit buffer or retransmission buffer of the macro base station.
- the RLC PDUs in the RLC1 and RLC2 transmission buffers of the micro base station need to be sent back to the macro base station, or the SN of the RLC PDU corresponding to the macro base station (requires a transmission buffer or retransmission buffer in the macro base station). A copy of the original RLC PDU is kept in the zone).
- the RLC PDUs in the RLC1 and RLC2 receive buffers need to be sent to the macro base station.
- the RLC PDUs in the RLC1 and RLC2 of the macro base station are no longer sent to the micro base station.
- the first RLC status report of the UE received by the macro base station is also no longer sent to the micro base station.
- the UE may report, by using a Power Headroom Reporting (PHR), the minimum transmit power of the nominal UE on the serving cell of each active state and the estimated transmit power on the UL-SCH.
- PHR Power Headroom Reporting
- the difference information may also report difference information between the nominal maximum transmit power of the UE and the estimated transmit power of the UL-SCH and the Physical Uplink Control Channel (PUCCH) on the primary serving cell (PCell).
- PHR Power Headroom Reporting
- the inter-base station CA if the cells aggregated by the two base stations are configured with the PUCCH, and the UE is configured to transmit the PUSCH and the PUCCH on the aggregated cell, there is no corresponding mechanism to implement the uplink of the two base stations. Power Control.
- FIG. 35 is a schematic flowchart of an uplink power control method according to an embodiment of the present invention. The method of Figure 35 is performed by the UE.
- the UE generates an extended PHR, where the extended PHR includes a first type of power headroom (PH) information and a second type of PH information of the first cell of the first base station, and a first type of the second cell of the second base station.
- PH information and second type PH information are included in the case of a CA between base stations.
- the first base station may be the primary base station and the second base station may be the secondary base station.
- the first cell may be a PCell
- the second cell may be an SCell.
- the first base station may also be a secondary base station, and the second base station may be a primary base station.
- the first cell may be an SCell
- the second cell may be a Pcell. This embodiment of the present invention does not limit this.
- the PH can include Type 1 (Type 1 ) PH and Type 2 (Type 2) PH.
- Type 1 PH may be equal to the maximum transmit power P CMAX configured by the UE on each active state serving cell, and C minus its PUSCH transmit power, which may be expressed as equation (1):
- Type 1 PH PCMAX
- Type 2 PH can be equal to the maximum transmit power P CMAX configured on the serving cell, C minus its PUCCH transmit power and PUSCH transmit power, which can be expressed as equation (2) :
- Type 2 PH PCMAX, C - PUCCH Transmit Power - PUSCH Transmit Power (2)
- the first type PH information may include type 1 PH
- the second type PH information may include type 2 PH.
- the first type of PH information of the first cell may further include the maximum transmit power of the first cell.
- the first type of PH information of the second cell may further include the maximum transmit power of the second cell.
- the condition that the UE triggers the PHR may include the PHR triggered by the downlink path loss exceeding the preset threshold, the PHR triggered by the periodic PHR timer timeout, and the UE triggered by the power management parameter (P-MPRc) changing beyond the preset threshold. PHR and so on.
- the UE sends an 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 control according to the extended PHR.
- the UE may send the extended PHR to the first base station according to the uplink resource of the first cell.
- the first base station may send the extended PHR to the second base station through the X2 interface. After the first base station and the second base station receive the extended PHR, the first base station and the second base station may perform uplink power control according to the extended PHR.
- the PHR timer (offPHR-Timer) may be started or restarted, and the UE may not transmit the extended PHR again when the PHR timer is disabled.
- the length of the PHR timer is generally far greater than the delay of the X2 interface. Therefore, the first base station or the second base station does not continuously receive the extended PHR sent by the UE and the PHR forwarded by another base station in a short time. It is difficult for the second base station to determine which extended PHR is the latest ambiguity problem.
- the extended PHR is generated by the UE, and the extended PHR includes the PH information of the first cell of the first base station and the PH information of the second cell of the second base station, so the UE sends the extended PHR to the first base station, After the base station sends the extended PHR to the second base station, the first base station and the second base station can perform uplink power control according to the extended PHR.
- FIG. 36 is a schematic flowchart of an uplink power control method according to an embodiment of the present invention.
- the method of 36 is performed by a base station.
- the first base station receives an extended PHR, where the extended PHR includes the first type PH information and the second type PH information of the first cell of the first base station, and the first type PH information and the second cell of the second cell of the second base station. Two types of PH information.
- the first base station may be the primary base station and the second base station may be the secondary base station.
- the first cell may be a PCell, and the second cell may be a SCell.
- the first base station may also be a secondary base station, and the second base station may be a primary base station.
- the first cell may be a SCell, and the second cell may be a Pcell. This embodiment of the present invention does not limit this.
- the first type PH information may include a type 1 PH
- the second type PH information may include a type 2 PH.
- the first base station performs uplink power control according to the extended PHR, and sends an extended PHR to the second base station, so that the second base station performs uplink power control according to the extended PHR.
- the first base station receives the extended PHR from the UE, and sends the extended PHR to the second base station, where the extended PHR includes the PH information of the first cell of the first base station and the PH of the second cell of the second base station.
- the information enables both the first base station and the second base station to perform uplink power control according to the extended PHR.
- the disclosed systems, devices, and methods may be implemented in other ways.
- the device embodiments described above are merely illustrative
- the division of the unit is only a logical function division, and the actual implementation may have another division manner, for example, multiple units or components may be combined or may be integrated into another system, or some features may be Ignore, or not execute.
- the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
- the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiment.
- each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
- the functions, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium.
- the technical solution of the present invention which is essential to the prior art or part of the technical solution, may be embodied in the form of a software product stored in a storage medium, including
- the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
- the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. .
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PCT/CN2012/084506 WO2014075210A1 (zh) | 2012-11-13 | 2012-11-13 | 传输数据的方法、基站和用户设备 |
EP12888440.0A EP2908570B1 (en) | 2012-11-13 | 2012-11-13 | Method and base station for transmitting data |
CN201710812863.2A CN107819546B (zh) | 2012-11-13 | 2012-11-13 | 传输数据的方法、基站和用户设备 |
MX2015006001A MX344890B (es) | 2012-11-13 | 2012-11-13 | Metodo, estacion base y equipo de usuario de transmision de datos. |
BR112015010763-0A BR112015010763B1 (pt) | 2012-11-13 | 2012-11-13 | Método e aparelho de transmissão de dados |
CN201710812827.6A CN107750064B (zh) | 2012-11-13 | 2012-11-13 | 传输数据的方法、基站和用户设备 |
CN201280028139.6A CN104041102A (zh) | 2012-11-13 | 2012-11-13 | 传输数据的方法、基站和用户设备 |
RU2015122423A RU2622110C2 (ru) | 2012-11-13 | 2012-11-13 | Способ передачи данных, базовая станция и пользовательское оборудование |
US14/709,922 US10110282B2 (en) | 2012-11-13 | 2015-05-12 | Data transmission method, base station, and user equipment |
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US16/142,525 US20190028151A1 (en) | 2012-11-13 | 2018-09-26 | Data transmission method, base station, and user equipment |
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Publication number | Publication date |
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EP2908570A1 (en) | 2015-08-19 |
CN107819546A (zh) | 2018-03-20 |
CN107750064B (zh) | 2020-08-14 |
EP2908570B1 (en) | 2019-06-19 |
RU2622110C2 (ru) | 2017-06-13 |
BR112015010763B1 (pt) | 2022-04-26 |
RU2015122423A (ru) | 2017-01-10 |
CN107819546B (zh) | 2023-07-11 |
MX344890B (es) | 2017-01-10 |
US20150244429A1 (en) | 2015-08-27 |
ZA201503592B (en) | 2020-02-26 |
EP2908570A4 (en) | 2016-04-06 |
BR112015010763A2 (pt) | 2017-07-11 |
CN107750064A (zh) | 2018-03-02 |
MX2015006001A (es) | 2015-10-29 |
US20190028151A1 (en) | 2019-01-24 |
US10110282B2 (en) | 2018-10-23 |
CN104041102A (zh) | 2014-09-10 |
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