WO2015184889A1 - 一种用户设备切换基站的方法及基站、用户设备 - Google Patents

一种用户设备切换基站的方法及基站、用户设备 Download PDF

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Publication number
WO2015184889A1
WO2015184889A1 PCT/CN2015/074644 CN2015074644W WO2015184889A1 WO 2015184889 A1 WO2015184889 A1 WO 2015184889A1 CN 2015074644 W CN2015074644 W CN 2015074644W WO 2015184889 A1 WO2015184889 A1 WO 2015184889A1
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WIPO (PCT)
Prior art keywords
base station
connection
configuration
secondary base
primary
Prior art date
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PCT/CN2015/074644
Other languages
English (en)
French (fr)
Inventor
王昕�
和峰
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to US15/508,194 priority Critical patent/US10512009B2/en
Priority to EP15803810.9A priority patent/EP3177071A4/en
Priority to JP2017512304A priority patent/JP6405454B2/ja
Publication of WO2015184889A1 publication Critical patent/WO2015184889A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to a mobile communication system, and more particularly to a method, a base station, and a user equipment for a user equipment to switch base stations in a mobile communication system deployed in a heterogeneous network.
  • E- UTRAN Evolved Universal Terrestrial Radio Access Network
  • UE User Equipment
  • a mobility management entity MME for short
  • MME mobility Management Entity
  • CN core network
  • MME mobility management entity
  • a base station that is regarded as a mobile anchor point is called a master base station (MeNB); a node that is connected to the MeNB and is connected to the X2 interface to provide additional radio resources to the UE, which is called a secondary base station (Secondary eNB, SeNB for short).
  • MME Mobility Management Entity
  • SeNB secondary base station
  • a wireless Uu interface is built between the UE and the MeNB and the SeNB, and the control plane signaling and the user plane data can be transmitted. This is also called the dual connectivity state (Dual Connectivity, DC for short). Because this system architecture enables two (or even multiple) base stations to simultaneously provide wireless resources for one UE to communicate services, the data throughput of the network has been greatly improved.
  • the user plane transmission and protocol stack form under this system architecture can be seen in Figure 2.
  • the following line data is taken as an example.
  • the transmission process is shown in Figure 2(a).
  • the transmission operation of the EPS bearer (EPS bearer) #1 is the same as the related standard, that is, the Serving Gateway (S-GW) passes the S1-U interface.
  • Sending the data packet to the MeNB, and then transmitting, by the MeNB, the data packet to the UE through the Uu interface; and the transmission of the EPS bearer #2 is after the data packet is sent by the S-GW to the MeNB through the S1-U interface, and the MeNB only Part of the data packet of the bearer is sent to the UE through the Uu port, and another part of the data packet is passed.
  • the X2 interface is delivered to the SeNB, and the SeNB sends the partial data packet to the UE through the Uu interface.
  • FIG. 2 (b) shows the configurable protocol stack form of the offload bearer (EPS bearer #2), that is, EPS bearer #2 has a Packet Data Convergence Protocol (PDCP) entity and two independent wireless sets.
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • the PDCP entity located in the MeNB delivers a part of the PDCP Protocol Data Unit (PDU) to the RLC entity located in the SeNB to transmit, and another part of the PDCP PDU is represented by the MeNB's own RLC entity (and the following protocol) Entity) to send.
  • the two RLC entities respectively process the received RLC PDUs and submit them to the unified PDCP entity to perform further operations.
  • a variable in a protocol layer is accumulated to a certain threshold, some configuration parameters of the UE need to be modified;
  • the serving base station of the UE needs to switch from the currently connected eNB (referred to as source base station, source eNB) to another suitable eNB (referred to as target base station, target eNB).
  • intra-base station intra-eNB change
  • inter-eNB change inter-eNB change
  • the SeNB of the UE when the MeNB of the UE needs to be changed, according to the related technology, the SeNB of the UE is released before the change procedure or the preparation phase of the change procedure. If after the UE accesses the target eNB (for the intra-eNB change, the target eNB is the original MeNB), there are still nodes with suitable service requirements and conditions, and the target eNB adds the SeNB to the UE.
  • the MeNB may simultaneously carry the (intra-) change information of the MeNB and the release and re-addition of the SeNB in one control plane signaling. The information, that is, the UE is instructed to reconfigure the resources of the two eNBs by only one signaling.
  • the user plane data transmission between the UE and the SeNB is interrupted due to the change of the MeNB of the UE. If the time taken by the UE to access the target eNB cell is long, the user plane data interruption time between the UE and the SeNB is lengthened. This means that the wireless resources that the network can provide for the UE are vacant, that is, the data throughput that the UE can be upgraded is limited. In turn, the overall performance of the network has also declined.
  • the embodiment of the present invention provides a method for a user equipment to switch a base station, and a base station and a user equipment, to solve the problem that the user plane data between the UE and the accessed secondary base station is interrupted when the primary base station accessed by the UE is changed.
  • the embodiment of the present invention discloses a method for a user equipment to switch a base station, including:
  • the target base station determines that the UE maintains connection and configuration with the secondary base station;
  • the target base station establishes a connection with the UE while the UE maintains connection and configuration with the secondary base station.
  • the determining, by the target base station, that the UE maintains a connection and configuration with the secondary base station includes:
  • the target base station receives the handover request sent by the primary base station and the secondary base station information of the UE, and determines, according to the secondary base station information of the UE, whether the UE maintains connection and configuration with the secondary base station after the base station is switched, and if the determination result is yes And determining that the UE maintains connection and configuration with the secondary base station.
  • the receiving, by the target base station, the handover request sent by the primary base station and the secondary base station information of the UE includes:
  • the target base station receives the handover request message sent by the primary base station, where the handover request message carries the secondary base station information of the UE.
  • the foregoing method further includes:
  • the target base station determines that the UE maintains the connection and configuration with the secondary base station after the handover of the base station, first establish an interface connection with the secondary base station, and then feed back the handover request acknowledgement to the primary base station and allow the UE to reserve the connection with the secondary base station. Configuration instructions.
  • the indication information that the target base station feeds back the handover request acknowledgement to the primary base station and allows the UE to reserve the connection and configuration with the secondary base station includes:
  • the target base station feeds back a handover request acknowledgement message to the primary base station, where the handover request acknowledgement message carries indication information that allows the UE to reserve connection and configuration with the secondary base station.
  • the foregoing method further includes:
  • the target base station establishes a connection with the UE, and after the UE has accessed the target cell and enables the new configuration, performs data scheduling on the user plane of the UE, where the target base station performs data scheduling on the user plane of the UE, including
  • the target base station transmits data via a Uu interface between itself and the UE, and the target base station transmits a partial packet data convergence protocol (PDCP) data unit (PDU) to the UE through the secondary base station.
  • PDCP packet data convergence protocol
  • the foregoing method further includes:
  • the primary base station After receiving, by the target base station, the indication information that allows the UE to reserve the connection and configuration with the secondary base station, the primary base station performs the original configuration of the offloaded bearer according to the indication that the UE is allowed to maintain the connection and configuration with the secondary base station.
  • the data packet continues to be delivered to the secondary base station.
  • the foregoing method further includes:
  • the primary base station continues to deliver the originally configured data packet of the offloaded bearer to the secondary base station, the data packet is sent to the target base station;
  • the primary base station continues to deliver the originally configured data packet of the offloaded bearer to the secondary base station, and stops receiving data packets to the secondary base station and starts to the target base station when receiving the information that the UE has enabled the new configuration. Send a packet.
  • the foregoing method further includes:
  • the secondary base station sends the received data packet to the UE in sequence, where the secondary base station receives the newly configured data packet of the offloaded bearer sent by the target base station, and the data packet in the buffer area is not sent yet.
  • the secondary base station discards the data packets in the buffer area.
  • the embodiment of the invention further discloses a method for a user equipment to switch a base station, including:
  • the UE When a handover occurs between a primary base station of a dual-link user equipment (UE), the UE maintains a connection and configuration with the secondary base station while establishing a connection with the target base station.
  • UE dual-link user equipment
  • the UE maintains a connection and configuration with the secondary base station, and establishing a connection with the target base station includes:
  • Radio resource control RRC
  • the UE leaves the source primary cell and accesses the target cell according to the RRC connection reconfiguration, and maintains the connection and configuration with the secondary base station according to the indication of the connection and configuration between the secondary base station and the secondary base station.
  • the receiving, by the UE, the RRC connection reconfiguration sent by the primary base station, and maintaining the connection and configuration with the secondary base station include:
  • the UE receives an RRC connection reconfiguration message, where the RRC connection reconfiguration message includes an indication of maintaining a connection and configuration with the secondary base station.
  • the foregoing method further includes:
  • the information about the newly configured information is fed back to the primary base station and/or the secondary base station.
  • the embodiment of the invention further discloses a method for a user equipment to switch a base station, including:
  • the primary base station determines that the UE maintains connection and configuration with the secondary base station;
  • the primary base station instructs the UE to leave the source cell and the access target cell while maintaining connection and configuration with the secondary base station.
  • the determining, by the primary base station, that the UE leaves the source cell and the access target cell while maintaining the connection and configuration with the secondary base station includes:
  • the primary base station transmits a radio resource control (RRC) connection reconfiguration to the UE and an indication to maintain connection and configuration with the secondary base station.
  • RRC radio resource control
  • the indication that the primary base station sends an RRC connection reconfiguration to the UE and maintains a connection and configuration with the secondary base station includes:
  • the primary base station sends an RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration
  • the set message carries an indication of maintaining a connection and configuration with the secondary base station.
  • the embodiment of the invention further discloses a method for a user equipment to switch a base station, including:
  • the UE When the primary cell of the dual-link user equipment (UE) switches, the UE maintains the connection and configuration with the secondary base station, and leaves the source cell and the access target cell at the same time.
  • the primary cell of the dual-link user equipment UE
  • the UE maintains a connection and configuration with the secondary base station, and the leaving the source cell and the access target cell includes:
  • Radio resource control Receiving, by the UE, a radio resource control (RRC) connection reconfiguration and an indication of maintaining a connection and configuration with a secondary base station, where the UE leaves the source cell and the access target cell according to the RRC, and simultaneously according to the RRC
  • RRC radio resource control
  • the indication that the UE receives the RRC connection reconfiguration sent by the primary base station and maintains the connection and configuration with the secondary base station includes:
  • the UE receives an RRC connection reconfiguration message sent by the primary base station, where the RRC connection reconfiguration message carries an indication of maintaining connection and configuration with the secondary base station.
  • the embodiment of the invention further discloses a base station device, including:
  • a first unit configured to determine, when the primary base station of the dual-link user equipment (UE) switches to the base station, to establish a connection and configuration between the UE and the secondary base station;
  • UE dual-link user equipment
  • the second unit is configured to establish a connection with the UE while maintaining the connection and configuration between the UE and the secondary base station.
  • the first unit includes:
  • a receiving module configured to receive a handover request sent by the primary base station and secondary base station information of the UE
  • the determining module is configured to determine, according to the secondary base station information of the UE, whether the UE maintains the connection and configuration with the secondary base station after the base station is switched; if the determination result is yes, when the primary base station of the dual-link UE switches to the local base station, determine the UE. Maintain connection and configuration with the secondary base station.
  • the receiving, by the receiving module, the handover request sent by the primary base station and the secondary base station information of the UE includes:
  • the first unit further includes:
  • An inter-base-station-building module is configured to establish an interface connection with the secondary base station, and then provide a handover request acknowledgement to the primary base station and allow the UE to reserve, when the determining module determines that the UE maintains the connection and configuration between the secondary base station and the secondary base station. Indication information for connection and configuration with the secondary base station.
  • the indication information that the inter-base station building chain module feeds back the handover request acknowledgement to the primary base station and allows the UE to reserve connection and configuration with the secondary base station includes:
  • a handover request acknowledgement message carries indication information that allows the UE to reserve connection and configuration with the secondary base station.
  • the second unit is further configured to perform a user plane data scheduling on the UE after establishing a connection with the UE, after the UE has accessed the target cell and enabled the new configuration.
  • the data unit scheduling of the user plane by the second unit includes transmitting data through a Uu interface between the device and the UE, and passing a partial packet data convergence protocol (PDCP) data unit (PDU) through the The base station transmits to the UE.
  • PDCP packet data convergence protocol
  • the foregoing base station device further includes:
  • a third unit configured to: when the primary base station that is the dual-link UE of the device is handed over to the target base station, receive indication information that is sent by the target base station to allow the UE to reserve connection and configuration with the secondary base station, and keep the UE in accordance with the And the indication of the connection and the configuration between the secondary base station, and the data packet of the originally configured offloaded bearer is continuously delivered to the secondary base station.
  • the third unit is further configured to: when the data packet of the originally configured offloaded bearer is continuously delivered to the secondary base station, further send a data packet to the target base station; or configure the original configuration
  • the data packet of the offloaded bearer continues to be delivered to the secondary base station, until receiving the information that the UE has enabled the new configuration, first stopping sending data packets to the secondary base station, and then sending data packets to the target base station.
  • the foregoing base station device further includes:
  • the fourth unit is configured to: when the device is a secondary base station of the dual-link UE, receive the data packet of the originally configured offload bearer from the primary base station, and receive the newly configured offloaded bearer from the target base station.
  • the data packet is sent to the UE in sequence, and when the data packet of the newly configured offload bearer sent by the target base station is received, if there are still data packets in the buffer area that are not sent, Drop the packets in the buffer.
  • the embodiment of the invention further discloses a user equipment, including:
  • the first unit is configured to maintain a connection and configuration with the secondary base station in the dual link when the primary base station of the device switches;
  • the second unit is configured to establish a connection with the switched target base station while maintaining the connection and configuration between the first unit and the secondary base station.
  • the foregoing user equipment further includes:
  • a transceiver unit configured to receive a radio resource control (RRC) connection reconfiguration sent by the primary base station and an indication of maintaining a connection and configuration with the secondary base station;
  • RRC radio resource control
  • the first unit is configured to maintain a connection and configuration with the secondary base station in the dual link according to the indication of the connection and configuration between the primary base station and the secondary base station when the primary base station of the device is switched;
  • the second unit is configured to leave the source cell and access the target cell according to the RRC connection reconfiguration, while maintaining the connection and configuration between the first unit and the secondary base station.
  • the receiving, receiving, by the transceiver unit, the RRC connection reconfiguration sent by the primary base station, and maintaining the connection and configuration with the secondary base station include:
  • the transceiver unit receives an RRC connection reconfiguration message, where the RRC connection reconfiguration message carries an indication of maintaining connection and configuration with the secondary base station.
  • the transceiver unit is further configured to: after the local device accesses the target cell, feed back information about the new configuration that is enabled to the primary base station and/or the secondary base station.
  • the embodiment of the invention further discloses a base station device, including:
  • a first unit configured to determine, when the dual-link user equipment (UE) switches in the primary cell of the local base station, to establish a connection and configuration between the UE and the secondary base station;
  • UE dual-link user equipment
  • a second unit configured to: when the first unit determines that the UE maintains a connection and configuration between the UE and the secondary base station, instructing the UE to leave the source cell and the access target cell while maintaining the connection with the secondary base station Connection and configuration.
  • the second unit indicates that the UE leaves the source cell and the access target cell, and the connection and configuration between the second base station and the secondary base station are:
  • the second unit is configured to send a radio resource control (RRC) connection reconfiguration to the UE, and maintain an indication and connection with the secondary base station.
  • RRC radio resource control
  • the second unit is configured to send an RRC connection reconfiguration to the UE, where the RRC connection reconfiguration message carries an indication of maintaining a connection and configuration with the secondary base station.
  • the embodiment of the invention further discloses a user equipment, including:
  • the first unit is configured to maintain a connection and configuration with the secondary base station when the primary cell is switched under the primary base station of the device;
  • the second unit is configured to leave the source cell and the access target cell while the first unit maintains the connection and configuration with the secondary base station.
  • the foregoing user equipment further includes:
  • a receiving unit configured to receive a radio resource control (RRC) connection reconfiguration sent by the primary base station, and an indication of maintaining a connection and configuration with the secondary base station;
  • RRC radio resource control
  • the first unit is configured to maintain a connection and configuration with the secondary base station according to an indication of maintaining connection and configuration between the secondary base station;
  • the second unit is configured to leave the source cell and the access target cell according to the RRC connection reconfiguration message while maintaining the connection and configuration between the first unit and the secondary base station.
  • the receiving unit is configured to receive an RRC connection reconfiguration sent by the primary base station, and the indication of maintaining a connection and configuration with the secondary base station includes:
  • the receiving unit is configured to receive a connection reconfiguration message sent by the RRC primary base station, where the RRC connection reconfiguration message carries an indication of maintaining connection and configuration with the secondary base station.
  • the embodiment of the invention further discloses a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the above method.
  • the solution for improving the data transmission performance of the user equipment in the heterogeneous network is applicable to all types of base stations, and all types and performance interfaces between the base stations.
  • the user plane between the UE and the accessed secondary base station may continue to transmit data without interruption. Thereby improving the performance and throughput of the user equipment to transmit data, and improving the use efficiency of the wireless resources.
  • FIG. 1 is a schematic diagram of deployment of a related heterogeneous network
  • FIG. 2(a) is a schematic diagram of downlink data transmission in the heterogeneous network shown in FIG. 1;
  • FIG. 2(b) is a schematic diagram of a configurable protocol stack of a offloading bearer in the heterogeneous network shown in FIG. 1;
  • FIG. 3 is a diagram showing an example of a scenario to which the solution of the embodiment of the present invention is applied;
  • Embodiment 1 of the present invention is a schematic flow chart of Embodiment 1 of the present invention.
  • FIG. 5 is a schematic flowchart of Embodiment 2 of the present invention.
  • FIG. 6 is a schematic diagram of a message according to Embodiment 3 of the present invention.
  • FIG. 7 is a block diagram of a base station device according to an embodiment of the present invention.
  • FIG. 8 is a block diagram of a user equipment according to an embodiment of the present invention.
  • FIG. 9 is a block diagram of another base station device according to an embodiment of the present invention.
  • FIG. 10 is a block diagram of another user equipment according to an embodiment of the present invention.
  • the inventor of the present application proposes that in the process of the UE moving, the primary base station may need to be changed.
  • the serving cell of the UE and the first base station (referred to as the source base station in the mobile scenario) is called
  • the signal quality decreases between the source cell and the cell with the third base station (referred to as the target base station) (referred to as the target cell); at the same time, the UE is always within the coverage of the second base station, that is, the UE and the second base station The signal quality between the two remains good.
  • the source base station instructs the UE to leave the source cell and the access target cell, and needs to instruct the UE to continue to perform data transmission with the second base station after accessing the target cell (ie, maintain the DC state). ) to maintain data transmission between the UE and the second base station. That is, the target base station becomes the new primary base station of the UE, and the X2 interface is established between the target base station and the second base station, and is responsible for transmitting control plane signaling and user plane data with each node of the core network.
  • the embodiment provides a method for a user equipment to switch a base station, which is mainly described from the network side operation, and includes the following operations:
  • the target base station determines that the UE maintains connection and configuration with the secondary base station;
  • the target base station establishes a connection with the UE while the UE maintains connection and configuration with the secondary base station.
  • the determining, by the target base station, the connection and configuration between the UE and the secondary base station includes:
  • the target base station receives the handover request (also referred to as the resource request message) sent by the primary base station and the secondary base station information of the UE, and determines, according to the secondary base station information of the UE, whether the UE maintains the connection and configuration with the secondary base station after the base station is switched, that is, determines to accept the UE. Whether the cell and the configuration of the secondary base station access are still reserved for the UE, and if the determination result is yes, it is determined that the UE maintains the connection and configuration with the secondary base station.
  • the secondary base station information of the UE includes the secondary base station cell information accessed by the UE, the signal quality measurement result of the UE to the secondary base station cell, and the resource configuration information of the UE on the secondary base station side.
  • the information about the secondary base station of the UE that is received by the target base station in this embodiment may be included in the handover request message sent by the primary base station, or may include the existing base station configuration update message sent by the primary base station, Add messages or add special messages.
  • the target base station After the target base station determines that the UE is allowed to maintain the connection and configuration with the secondary base station after the handover of the base station, the target base station first establishes an interface connection with the secondary base station, that is, initiates a process of adding the secondary base station to the secondary base station, and the main process of the process The goal is to establish a dual connectivity service for the UE. Collaboration interface, including control plane and user plane tunnel. Then, the target base station returns a handover request acknowledgement to the primary base station and indication information allowing the UE to reserve connection and configuration with the secondary base station.
  • the indication information that allows the UE to reserve the connection and configuration with the secondary base station may be included in the handover request acknowledgement message (also referred to as an admission acknowledgement message), or may be included in an existing base station configuration update message, a new message, or a new one. In a dedicated message.
  • the UE when receiving the handover request acknowledgement (also referred to as admission acknowledgement) message fed back by the target base station and the indication information that allows the UE to reserve connection and configuration with the secondary base station, the UE is notified to leave according to the handover request acknowledgement message.
  • the source cell and the access target cell according to the indication information that allows the UE to reserve the connection and configuration with the secondary base station, instruct the UE to maintain the connection and configuration with the secondary base station during the handover process, and confirm (ie, accept the acknowledgement) message according to the handover request.
  • the new resource configuration information constitutes control plane signaling for the UE and is forwarded to the UE.
  • the target base station can perform user plane data scheduling on the UE as the primary base station of the UE.
  • the sending of the offloaded bearer includes that the target base station transmits via the Uu interface between itself and the UE, and the target base station delivers the partial PDCP PDU to the secondary base station for transmission.
  • the target base station configures the UE to feed back a Packet Data Convergence Protocol (PDCP) status report after the access is successful
  • the target base station performs the retransmission or discard operation of the data packet after receiving the PDCP status report.
  • PDCP Packet Data Convergence Protocol
  • the primary base station forms the UE-oriented control plane signaling according to the received information and sends the signal to the UE
  • the user plane data packet transmission between the base stations mainly includes the data packet and the primary base station sends the data packet to the secondary base station.
  • the data packet sent by the primary base station to the secondary base station includes: the primary base station has not received the PDCP PDU indicating that the RLC entity has successfully transmitted, and the primary base station has not transmitted the PDCP physical buffer area when transmitting the control plane signaling to the UE.
  • the sending behavior ends when the source base station receives information indicating that the UE has enabled the new configuration.
  • the data packet forwarded by the primary base station to the target base station includes: the primary base station not receiving the RCP entity (including the RLC entity located at the primary base station or the secondary base station) indicating that the PDCP SDU has been successfully transmitted, when the control plane signaling is sent to the UE,
  • the primary base station has not been transmitted in the PDCP physical buffer area. SDU, and subsequent PDCP SDU newly received from the S-GW.
  • the forwarding behavior starts after the primary base station sends the control plane signaling of the base station change to the UE, or starts when the production base station receives the information indicating that the UE has enabled the new configuration; the forwarding behavior ends when the primary base station has forwarded all the data packets of the UE. Time.
  • the secondary base station first receives the PDCP PDU from the primary base station, and then receives the PDCP PDU from the target base station, and the secondary base station sequentially processes the data packets through the lower layer protocol entity and then sends the data packets to the UE. If the secondary base station receives the PDCP PDU from the target base station, there are still data packets in the RLC entity buffer area that have not been transmitted, and the secondary base station discards the data packets and does not transmit them.
  • the target base station or the UE may indicate the information that the UE has enabled the new configuration to the secondary base station through the X2 port or the Uu port; after receiving the information, the secondary base station may discard all the data packets from the primary base station in the RLC entity buffer area. Instead of sending.
  • the primary base station may send a termination flag information to the secondary base station to indicate that the secondary base station does not need to send the data packet to the UE again.
  • the indication information of the termination flag may be an indicator of a control plane or a user plane, or may be a control plane message requesting the secondary base station to release a transmission tunnel with the primary base station.
  • the UE does not immediately enable the new configuration when receiving the base station change signaling from the primary base station, but continues to work using the original configuration; After entering the target cell and replying to the signaling indicating that the new configuration is enabled, the PDCP entity of the UE starts to enable the new configuration, while the underlying entity configuration remains unchanged, and the decryption fails or duplicated packet is discarded.
  • the specific implementation manner is exemplified by the following data transmission, and for the transmission of the uplink data (if the uplink bearer is transmitted via the second base station), the UE will enable after receiving the air interface control plane signaling.
  • the uplink data of the bearer is transmitted according to the uplink transmission resource allocated by the second base station; the secondary base station delivers the received uplink data to the primary base station. After the secondary base station acquires the information that the UE has enabled the new configuration, the received uplink data is delivered to the target base station.
  • the following embodiment further provides a method for the user equipment to switch the base station, which is mainly described from the operation of the user side, and the method includes:
  • the UE When the primary base station of the dual-link UE switches, the UE maintains the connection and configuration with the secondary base station, and establishes a connection with the target base station of the handover.
  • the UE maintains the connection and configuration with the secondary base station, and establishes a connection with the target base station to be switched, including:
  • the UE leaves the source cell and accesses the target cell, and maintains the connection and configuration with the secondary base station according to the indication of the connection and configuration between the secondary base station and the secondary base station.
  • the indication that the UE receives the connection and configuration between the secondary base station and the secondary base station may be included in the RRC connection reconfiguration message, or may be included in the newly added dedicated message. There are no restrictions here.
  • the information about the newly configured configuration may be fed back to the primary base station and/or the secondary base station.
  • the primary base station may send a termination indication to the secondary base station, indicating that the secondary base station discards all the data packets of the buffered primary base station to improve the secondary base station resource usage rate.
  • the secondary base station can directly discard all the data packets buffered in the local primary base station, and also improve the resource utilization rate.
  • the complete base station handover procedure includes the operations on the network side and the user side.
  • the target base station determines that the UE can continue to perform data transmission with the second base station after the UE accesses the target cell, that is, maintains the DC state.
  • the source base station continues to deliver the PDCP PDU of the offloaded bearer to the second base station, so that the UE can continue to perform user plane data between the second base station and the second base station during the inter-base station change procedure of the first base station. transmission.
  • the UE starts to enable the new configuration after accessing the target cell.
  • the specific process is shown in Figure 4.
  • the first base station (ie, the primary base station, also referred to as the source base station in this scenario) performs a pre-program change UE User plane data transmission path (as mentioned above, the following line EPS Bearer #2 is configured as the offload mode as an example): the source base station receives the EPS Bearer #2 data packet from the S-GW, and the PDCP entity pair located at the source base station The data packet is subjected to a packaging operation such as encryption.
  • the PDCP entity sends a part of the PDCP PDU to the UE through the Uu interface between the source base station and the UE, and sends another part of the PDCP PDU through the X2 port between the source base station and the second base station (ie, the secondary base station).
  • the second base station sends the received PDCP PDU to the UE through the Uu interface after being processed by the lower layer protocol entity.
  • Inter-base station change procedure preparation phase of the first base station (steps 401-404): the source base station decides to change the primary serving base station of the UE to the target base station to continue to obtain the communication service according to the measurement report of the UE (or the result of other radio resource management functions). .
  • the source base station carries at least the secondary base station information of the UE, for example, the measurement result of the second base station cell signal of the UE, in the message 1 (handover request message) sent by the source base station to the target base station. And resource configuration information on the second base station side.
  • the source base station sends the message 1, it corresponds to the handover of the primary base station of the UE in the above method.
  • the target base station determines, according to the received information, if the target base station decides to reserve the connection of the second base station for the UE and the related configuration remains unchanged, the target base station requests the second base station to establish a transmittable split data packet (PDCP PDU).
  • PDCP PDU transmittable split data packet
  • User plane tunnel messages 2 and 3 in FIG. 4 are examples, and the main purpose of X2 control plane signaling for interaction between the target base station and the second base station is to establish a necessary interface to subsequently provide DC services for the UE).
  • the target base station After agreeing to the handover request of the source base station and preparing the interface with the second base station, the target base station replies to the source base station with a message 4 (Handover Request Acknowledgement message), where the message carries new resource configuration information, and the UE may The indication of the second base station is retained.
  • a message 4 Hydrophilicity Request Acknowledgement message
  • the inter-base-station change procedure execution phase of the first base station (steps 405-408): after receiving the acknowledgement reply from the target base station, the source base station sends a message 5 (RRC Connection Reconfiguration message, ie, radio resource control connection reconfiguration message) to the UE. And indicating that the UE leaves the source cell and the access target cell while maintaining connection and configuration with the second base station.
  • the message carries new configuration information indicated by the target base station.
  • the UE leaves the source cell on one hand and uses a random access procedure. Accessing the target cell of the target base station, on the other hand, the UE for the offloaded bearer (EPS Bearer #2) and the associated base station corresponding to the second base station still use the old configuration and continue to work. That is to say, the UE can continue to transmit data packets with the second base station while performing the inter-base station change procedure of the first base station, and the data packet is processed by the PDCP entity and then delivered to the upper layer.
  • EPS Bearer #2 offloaded bearer
  • the source base station After the source base station sends the message 5 to the UE, the source base station continues to deliver the data packet of the offload bearer (EPS Bearer #2) to the second base station for transmission, where the data packet includes: when the source base station sends the message 5
  • the PDCP PDU indicating that the RLC entity has successfully transmitted, the PDCP PDU that has not been transmitted in the source base station PDCP entity buffer, and the PDCP PDU newly received from the S-GW and processed by the PDCP entity are not received.
  • the second base station sends the received data packet to the UE through the Uu interface after being processed by the lower layer protocol entity.
  • the source base station sends a message 6a (number status message) to the target base station and performs data packet forwarding
  • the data packet includes: the source base station has not received the RLC entity when transmitting the message 5 (including the source base station and the second
  • the RLC entity of the base station indicates the PDCP SDU that has been successfully transmitted, the SDU that has not been transmitted in the source base station PDCP physical buffer, and the PDCP SDU that is newly received from the S-GW.
  • the UE After successfully accessing the target cell (step 407), the UE sends a message 8 (RRC Connection Reconfiguration Complete message, that is, a radio resource control connection reconfiguration complete message) to the target base station, indicating that the UE has enabled the new configuration.
  • the target base station may perform user plane transmission scheduling on the UE.
  • the sending of the offloaded bearer includes that the target base station transmits via the Uu interface between itself and the UE, and the target base station delivers the partial PDCP PDU to the second base station for transmission.
  • the target base station configures the UE to feed back the PDCP status report after the access is successful, the target base station performs the retransmission or discard operation of the data packet according to the information after receiving the status report.
  • the second base station After the inter-base-station change procedure of the first base station, the second base station first receives the originally configured PDCP PDU from the source base station, and then receives the newly configured PDCP PDU from the target base station, and the second base station sends the data packets in sequence. Give the UE. If the second base station receives the PDCP PDU from the target base station, and there are still data packets in the RLC entity buffer area that are not transmitted, the second base station discards the data packets and does not transmit. Optionally, the target base station or the UE may enable the new configuration of the UE. This information (in accordance with message 8) is indicated to the second base station through the X2 port or the Uu port; after receiving the information, the second base station will discard all the data packets from the source base station in the RLC entity buffer area. Send it.
  • This information (in accordance with message 8) is indicated to the second base station through the X2 port or the Uu port; after receiving the information, the second base station will discard
  • the first base station inter-base station change procedure completion stage (steps 409-410): the target base station requests the CN node (MME) to change the user plane downlink tunnel endpoint through the triggering procedure 9, and notifies the user of the information of the tunnel end point.
  • the CN After receiving the request message, the CN starts to send the downlink data packet to the target base station.
  • the target base station first transmits/retransmits the data packet forwarded from the source base station and retransmits the data packet from the CN (S-GW).
  • S-GW CN Context Release message
  • the target base station sends a message 10 (UE Context Release message) to the source base station to indicate successful completion of the change procedure between the base stations, and the source base station can forward the data packet. After deleting the context of the UE.
  • the system architecture, user plane mode, and mobile scene based on this scenario are the same as those in scenario 1.
  • the source base station continuously delivers the PDCP PDU of the offloaded bearer to the second base station; and after the source base station acquires the information that the UE has successfully accessed the target cell, starts to the target base station. Forward the packet. The UE starts to enable the new configuration after accessing the target cell.
  • the specific process is shown in Figure 5.
  • the user plane data transmission path of the UE before the first base station performs the change procedure and the change procedure preparation phase (step 501) between the first base station base station are the same as the application scenario 1.
  • the inter-base-station change procedure execution phase of the first base station (steps 502-506): after receiving the acknowledgment reply from the target base station, the source base station sends a message 2 (RRC Connection Reconfiguration message) to the UE, indicating that the UE leaves the source cell. And accessing the target cell while maintaining connection and configuration with the second base station.
  • the message carries new configuration information indicated by the target base station.
  • the UE leaves the source cell on one hand and accesses the target cell of the target base station through a random access procedure.
  • the UE associates the offloaded bearer (EPS Bearer #2) with the second base station.
  • EPS Bearer #2 offloaded bearer
  • the source base station After the source base station sends the message 2 to the UE, the source base station continues to deliver the data packet of the offload bearer (EPS Bearer #2) to the second base station for transmission, where the data packet includes: the source base station is transmitting the message.
  • the PDCP PDU indicating that the RLC entity has successfully transmitted
  • the PDCP PDU that has not been transmitted in the source base station PDCP physical buffer
  • the PDCP PDU newly received from the S-GW and processed by the PDCP entity have not been received yet.
  • the second base station sends the received data packet to the UE through the Uu interface after being processed by the lower layer protocol entity.
  • the source base station does not forward the data packet to the target base station at this time.
  • the UE After successfully accessing the target cell (step 503), the UE sends a message 4 (RRC Connection Reconfiguration Complete message) to the target base station, indicating that the UE has enabled the new configuration.
  • the target base station After receiving the message 4, the target base station sends control plane signaling (message 5) to the source base station, indicating that the UE has successfully completed the change procedure of the first base station and starts to enable the new configuration.
  • the second base station can obtain the information that the UE has enabled the new configuration by using the lower layer protocol entity, the information may be sent by the second base station to the source base station through the X2 interface.
  • the source base station After receiving the message 5, the source base station stops sending data packets to the second base station, and starts data forwarding to the target base station through the data forwarding tunnel established in the change procedure preparation phase, and sends a message 6a to the target base station. Status message).
  • the forwarded data packet includes: the source base station not receiving the PDCP SDU indicating that the RLC entity located at the second base station has successfully transmitted, the SDU that has not been transmitted in the source base station PDCP physical buffer area, and the subsequent A PDCP SDU newly received from the S-GW. In this way, the redundancy of the X2 port transmission data packet can be reduced.
  • the target base station may perform downlink transmission scheduling of the user plane to the UE.
  • the sending of the offloaded bearer includes that the target base station transmits via the Uu interface between itself and the UE, and the target base station delivers the partial PDCP PDU to the second base station for transmission.
  • the target base station configures the UE to feed back the PDCP status report after the access is successful, the target base station performs a retransmission or discard operation of the data packet according to the feedback information of the status report.
  • the second base station After the inter-base-station change procedure of the first base station, the second base station first receives the originally configured PDCP PDU from the source base station, and then receives the newly configured PDCP PDU from the target base station, and the second base station sends the data packets in sequence. Give the UE. If the second base station receives the PDCP PDU from the target base station, and there are still data packets in the RLC entity buffer area that are not transmitted, the second base station discards the data packets and does not transmit.
  • the target base station or the UE may indicate that the UE has enabled the new configuration (according to message 4) to the second base station through the X2 port or the Uu port; after receiving the information, the second base station receives the RLC.
  • the physical buffer area discards all data packets from the source base station and no longer transmits them. Or, optionally, the source base station obtains information that the UE has enabled the new configuration. After that, a message of the termination flag may be sent to the second base station to indicate that the second base station does not have to send the data packet to the UE again.
  • the indication information of the termination flag may be an indicator of a control plane or a user plane, or may be a control plane message requesting the second base station to release a transmission tunnel with the source base station.
  • the inter-base station change procedure completion phase of the first base station (step 507): the same as scenario one.
  • This embodiment provides a method for a user equipment to switch a base station, and the concept is the same as that of Embodiment 1 above. It is proposed for the case where the primary cell in the primary base station of the UE is changed, and is described from the operation of the primary base station side, and mainly includes the following operations:
  • the primary base station determines that the UE maintains connection and configuration with the secondary base station;
  • the primary base station instructs the UE to leave the source cell and the access target cell while maintaining connection and configuration with the secondary base station.
  • the primary base station sends an RRC to the UE and maintains an indication of the connection and configuration with the secondary base station, that is, the primary base station indicates that the UE leaves the source cell and the access target cell, and maintains the connection and configuration with the secondary base station.
  • the indication of maintaining connection and configuration with the secondary base station may be included in the RRC Connection Reconfiguration message.
  • the indication of maintaining the connection and configuration with the secondary base station may also be included in the newly added message, and is not particularly limited herein.
  • the primary base station uses the new resource configuration information to transmit data for the UE.
  • the embodiment further provides a method for the user equipment to switch the base station, which is corresponding to the foregoing method, and is mainly introduced from the operation of the UE side, and includes the following operations:
  • the UE When the primary cell of the dual-link UE is switched, the UE maintains the connection and configuration with the secondary base station, and leaves the source cell and the access target cell at the same time.
  • the UE receives the RRC sent by the primary base station and the indication of maintaining the connection and configuration with the secondary base station, and then leaves the source cell and the access target cell according to the RRC, and according to the indication of the connection and configuration between the secondary base station and the secondary base station, Maintain connection and configuration with the secondary base station.
  • the indication of the connection and configuration between the base stations may be included in the RRC connection reconfiguration message sent by the primary base station.
  • the indication of maintaining the connection and configuration with the secondary base station may also be included in the newly added message, which is not limited in this embodiment.
  • the process of implementing base station handover according to the above method will be described below in conjunction with a specific application scenario.
  • the complete base station handover procedure includes the operations of the base station and the UE side in the foregoing method.
  • the system architecture and user plane mode on which the application scenario is based are the same as those in the first embodiment.
  • the serving cell that the UE accesses in the first base station ie, the primary base station
  • the scenario according to this embodiment is used.
  • the UE is changed in the primary cell of the first base station, and the first base station therefore determines that the UE needs to be reconfigured for mobility. This is referred to as a case of intra-base station change in this patent.
  • the first base station continues to deliver the PDCP PDU of the offloaded bearer to the second base station.
  • the UE starts to enable the new configuration after re-accessing the cell of the first base station.
  • the specific process is shown in Figure 6.
  • the user plane data transmission path of the UE before the first base station performs the intra-base station change procedure is the same as that of the application scenario 1.
  • Step 601 The first base station determines, according to the measurement report information of the UE, that the (primary) serving cell (source cell) of the UE needs to be changed to another cell (target cell) in the first base station, while maintaining the UE access.
  • the second base station cell and the resource configuration on the second base station side are unchanged.
  • the first base station sends a message 1 (RRC Connection Reconfiguration message) to the UE, indicating that the UE leaves the source cell and the access target cell while maintaining connection and configuration with the second base station (ie, the secondary base station).
  • the message carries new configuration information.
  • the primary base station When the primary base station sends the message 1 to the UE, it is considered to be the time when the primary cell of the primary base station of the dual-link UE described in the foregoing method is switched.
  • the first base station continues to deliver the data packet of the offload bearer (EPS Bearer #2) to the second base station for transmission.
  • the data packet includes: the first base station has not received the indication that its own RLC entity has succeeded when sending the message 1.
  • the transmitted PDCP PDU the PDCP PDU that has not been transmitted in the source base station PDCP entity buffer area, and the PDCP that is newly received from the S-GW and processed by the PDCP entity. PDU.
  • the network side still uses the configuration of the old PDCP entity to encapsulate the data packet.
  • the second base station sends the received data packet to the UE through the Uu interface after being processed by the lower layer protocol entity.
  • Step 602 The UE leaves the source cell on the one hand and accesses the target cell through the random access procedure (step 602) according to the received indication of the message 1. On the other hand, the UE pairs the offload bearer (EPS Bearer #2). Each associated protocol entity corresponding to the second base station still uses the old configuration and continues to operate.
  • EPS Bearer #2 the offload bearer
  • Step 603 After successfully accessing the target cell, the UE sends a message 3 (RRC Connection Reconfiguration Complete message) to the first base station, indicating that the UE has started to enable the new configuration. After receiving the message 3, the first base station starts to perform user plane transmission scheduling using the new configuration.
  • the sending of the offloaded bearer includes: the first base station sends the Uu interface between itself and the UE, and the first base station delivers the partial PDCP PDU to the second base station for sending.
  • the first base station configures the UE to feed back the PDCP status report after the access is successful, the first base station performs a retransmission or discard operation of the data packet according to the feedback information of the status report.
  • the second base station After the intra-base station change procedure of the first base station, the second base station receives the originally configured PDCP PDU from the first base station, and then receives the newly configured PDCP PDU, and the second base station sends the data packets to the sequence in sequence. UE.
  • the first base station or the UE may indicate to the UE that the new configuration has been enabled (according to message 3) through the X2 port or the Uu port.
  • the second base station After receiving the information, discards all the data packets to be stored in the RLC entity buffer area and does not transmit any more.
  • the indication information may be an indicator of a control plane or a user plane.
  • the embodiment provides a base station device, which can implement the method of the foregoing Embodiment 1, including the first unit and the second unit, as shown in FIG. 7.
  • a first unit configured to determine, when the primary base station of the dual-link UE switches to the local base station, to establish a connection and configuration between the UE and the secondary base station;
  • the first unit is divided into the following modules:
  • a receiving module configured to receive a handover request sent by the primary base station and secondary base station information of the UE
  • the handover request received by the receiving module and the secondary base station information of the UE may be included in a handover request message, or may obtain the secondary base station information of the UE from an existing base station configuration update message sent by the primary base station or a newly added message. .
  • the determining module is configured to determine, according to the secondary base station information of the UE, whether the UE maintains the connection and configuration with the secondary base station after the base station is switched; if the determination result is yes, when the primary base station of the dual-link UE switches to the local base station, determining that the UE remains Connection and configuration between secondary base stations.
  • the second unit is configured to establish a connection with the UE while maintaining the connection and configuration between the UE and the secondary base station.
  • the second unit is further configured to establish a connection with the UE. After the UE has accessed the target cell and enabled the new configuration, the user performs data scheduling on the user plane. It should be noted that if the base station configures the UE to feed back the PDCP status report after the access is successful, the second unit performs the user plane data scheduling on the UE after receiving the PDCP status report.
  • an inter-base station chain-building module is added to the base station device, and the module is configured to establish an interface connection with the secondary base station first, and then to the main node, when the determining module determines that the UE maintains the connection and configuration between the base station and the secondary base station.
  • the base station feeds back the handover request acknowledgement and indication information that allows the UE to reserve connection and configuration with the secondary base station.
  • the handover request acknowledgement message may be fed back to the primary base station, where the handover request acknowledgement message carries indication information that allows the UE to reserve connection and configuration with the secondary base station.
  • the indication information allowing the UE to reserve connection and configuration with the secondary base station may also be fed back to the primary base station through other messages.
  • the base station device may be used as the primary base station in addition to the target base station. Therefore, the third base unit is further configured to allow the UE to be reserved by the target base station when the primary base station of the dual-link UE is switched to the target base station.
  • the indication information of the connection and configuration with the secondary base station, and the data packet of the originally configured offloaded bearer is continuously delivered to the secondary base station according to the indication that the UE is allowed to maintain the connection and configuration with the secondary base station.
  • the foregoing third unit is further configured to continue to forward the data packet of the originally configured offloading bearer.
  • the data packet is sent to the target base station; or the data packet of the originally configured offloaded bearer is continuously delivered to the secondary base station, and when the information that the new configuration is enabled by the UE is received, the data packet is first sent to the secondary base station. The data packet is then sent to the target base station.
  • the base station device may be used as a secondary base station in addition to the target base station and the primary base station. Therefore, the base station device may further include a fourth unit configured to receive the original configuration from the primary base station when the local device is the secondary base station of the dual-link UE.
  • the data packet of the newly-configured offload bearer is received from the target base station, and the received data packet is sequentially sent to the UE, where the data of the newly configured offload bearer sent by the target base station is received. In the case of a packet, if there are still packets in the buffer area that have not been sent, the packets in the buffer area are discarded.
  • the embodiment further provides a user equipment, as shown in FIG. 8, which cooperates with the foregoing base station equipment to implement the base station handover method of the first embodiment.
  • the user equipment includes a first unit and a second unit.
  • the first unit is configured to maintain a connection and configuration with the secondary base station in the dual link when the primary base station of the device switches;
  • the second unit is configured to establish a connection with the switched target base station while maintaining the connection and configuration between the first unit and the secondary base station.
  • the user equipment further includes a transceiver unit configured to receive an RRC sent by the primary base station and an indication of maintaining connection and configuration with the secondary base station.
  • the first unit is configured to maintain the connection and configuration with the secondary base station in the dual link according to the indication of the connection and configuration between the secondary base station when the primary base station of the device is switched;
  • the method is configured to leave the source cell according to the RRC and access the target cell while maintaining the connection and configuration between the first unit and the secondary base station.
  • the indication that the transceiver unit receives the connection and configuration with the secondary base station may be included in the RRC connection reconfiguration message, or may be any other message.
  • the transceiver unit is further configured to: after the device accesses the target cell, feed back information about the newly configured configuration to the primary base station and/or the secondary base station.
  • the process of indirect indication by the primary base station includes that the primary base station receives the information that the new configuration is enabled, and sends a termination indication to the secondary base station according to the information.
  • the base station device and the user equipment can cooperate to complete the base station handover procedure, in actual applications, the base station device and the user equipment are independent, and are not limited to use, and may be used separately.
  • the embodiment provides a base station device. As shown in FIG. 9, the method of Embodiment 2 above may be implemented, which includes a first unit and a second unit.
  • a first unit configured to determine, when the dual-link UE switches in the primary cell of the local base station, to establish a connection and configuration between the UE and the secondary base station;
  • the second unit is configured to, when the first unit determines that the UE maintains the connection and configuration between the UE and the secondary base station, instruct the UE to leave the source cell and the access target cell, and maintain the connection and configuration with the secondary base station.
  • the second unit is configured to send an RRC to the UE, and maintain an indication of the connection and configuration with the secondary base station, thereby instructing the UE to leave the source cell and the access target cell while maintaining the connection with the secondary base station. And configuration.
  • the indication that the second unit sends to the UE to maintain the connection and configuration with the secondary base station may be included in the RRC connection reconfiguration message, or may be in any other message.
  • the method of the foregoing embodiment 2 can be implemented, and the detailed operation of each unit can be referred to the corresponding content of the foregoing embodiment 2, and details are not described herein again.
  • This embodiment further introduces a user equipment, which cooperates with the foregoing base station device to implement the method in Embodiment 2 above.
  • the user equipment includes a first unit and a second unit, as shown in FIG.
  • the first unit is configured to maintain a connection and configuration with the secondary base station when the primary cell is switched under the primary base station of the device;
  • the second unit is configured to leave the source cell and the access target cell while the first unit maintains the connection and configuration with the secondary base station.
  • the user equipment further includes a receiving unit, configured to receive the RRC sent by the primary base station, and maintain an indication of the connection and configuration with the secondary base station.
  • the first unit is arranged to maintain connection and configuration with the secondary base station in accordance with an indication of the connection and configuration between the secondary base station and the secondary base station.
  • the second unit is configured to leave the source cell and the access target cell according to the RRC message, while maintaining the connection and configuration between the first unit and the secondary base station.
  • the indication that the receiving unit receives the connection and configuration with the secondary base station may be included in the RRC connection reconfiguration message received by the receiving unit, or may be included in any other message.
  • the base station device and the user equipment can cooperate to complete the base station handover procedure, in actual applications, the base station device and the user equipment are independent, and are not limited to use, and may be used separately.
  • the above technical solution is applicable to all types of base stations, and all types and performances between base stations are connected. mouth.
  • the technical solution of the present application in the process of transmitting data and/or moving by the UE, when the primary base station accessed by the UE is changed, the user plane between the UE and the accessed secondary base station is not interrupted, and the data can be continuously transmitted. Improve the performance and throughput of user equipment transmission data, and improve the efficiency of wireless resources.

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  • Mobile Radio Communication Systems (AREA)

Abstract

一种用户设备切换基站的方法及基站、用户设备，涉及异构网络部署的移动通信系统。本发明实施例公开的一种用户设备切换基站的方法，包括：当双链接用户设备(UE)的主基站发生切换时，目标基站确定UE保持与次基站间的连接与配置；目标基站在所述UE保持与所述次基站间的连接与配置的同时，与UE建立连接。本发明实施例还公开了其他三种用户设备切换基站的方法及对应的基站、用户设备。本申请技术方案，在UE传输数据和/或移动的过程中，当UE接入的主基站发生变更时，UE与接入的次基站间的用户面不会中断、即可继续传输数据。从而提升了用户设备传输数据的性能及吞吐量，并提高了无线资源的使用效率。

Description

一种用户设备切换基站的方法及基站、用户设备 技术领域
本发明涉及在移动通信系统中，尤其是涉及在异构网络部署的移动通信系统中的一种用户设备切换基站的方法及基站、用户设备。
背景技术
第三代伙伴组织计划(Third Generation Partnership Projects，简称3GPP)认为，小小区(Small Cell)的部署及其能力方面的增强是未来通信网络发展中最令人感兴趣的课题之一。目前，通信业界普遍认同的一种场景是，在宏基站的覆盖范围内或边界处部署低功率节点、两者共同组成演进的通用陆地无线接入网(Evolved Universal Terrestrial Radio Access Network，简称E-UTRAN)系统中的接入网，从而为用户设备(User Equipment，简称UE)提供联合的数据传输服务。
这种典型的场景可参考图1所示的系统架构，其中，与核心网(Core Network，简称CN)中的移动性管理实体(Mobility Management Entity，简称MME)建有S1-MME接口、并被CN视作移动锚点的基站，称为主基站(Master eNB，简称MeNB)；与MeNB间以X2接口相连、为UE提供额外的无线资源的节点，称为次基站(Secondary eNB，简称SeNB)。UE与MeNB、SeNB间均建有无线Uu口，可传输控制面信令和用户面数据，这也称UE处于双连接态(Dual Connectivity，简称DC)。因为这种系统架构使得两个(甚至多个)基站可以同时提供无线资源为一个UE进行通讯服务，所以网络的数据吞吐量得到了极大的提升。
这种系统架构下的用户面传输及协议栈形式可以参见图2。以下行数据为例，传输过程如图2(a)所示，EPS承载(EPS bearer)#1的传输操作同相关标准，即由服务网关(Serving Gateway，简称S-GW)通过S1-U接口将数据包发送给MeNB、再由MeNB通过Uu口将数据包发送给UE；而EPS承载#2的传输是在由S-GW通过S1-U接口将数据包发送给MeNB后，MeNB仅将所述承载的部分数据包通过Uu口发送给UE，而另一部分数据包则通过 X2接口递交给SeNB、再由SeNB通过Uu口将这部分数据包发送给UE。
图2(b)所示为分流承载(EPS bearer#2)可配置的协议栈形式，即EPS bearer#2具备一个数据包汇聚协议(Packet Data Convergence Protocol，简称PDCP)实体、两套独立的无线链路控制(Radio Link Control，简称RLC)及以下协议实体。在数据的发送端，位于MeNB的PDCP实体将部分PDCP协议数据单元(Protocol Data Unit，简称PDU)递交给位于SeNB的RLC实体去发送、另一部分PDCP PDU则由MeNB自身的RLC实体(及以下协议实体)进行发送。在数据的接收端，两个RLC实体分别将接收到的RLC PDU处理后递交给统一的PDCP实体去执行进一步的操作。
在UE进行数据传输和/或移动的过程中会存在两种场景：一是例如当某协议层中的变量累计到一定的门限时，所述UE的某些配置参数需要进行修改；二是例如当信号质量下降到一定门限时，所述UE的服务基站需要从当前连接的eNB(称为源基站，source eNB)切换至另一个合适的eNB(称为目标基站，target eNB)。这两种场景需要通过基站内变更(intra-eNB change，变更前后UE仍与同一eNB建立连接，仅相关参数进行了重配)或基站间变更(inter-eNB change，变更前后UE与不同eNB建立连接)程序来实现。
在上述系统架构下，当UE的MeNB需要进行变更时，依据相关技术，UE的SeNB会在变更程序前、或变更程序的准备阶段中被释放掉。如果在UE接入target eNB后(对于intra-eNB change，target eNB就是原MeNB)仍存在业务需求及条件适合的节点，那么target eNB会为所述UE再添加SeNB。可选的，对于intra-eNB change来讲，如果原SeNB的条件一直满足门限，那么MeNB可以在一条控制面信令中同时携带MeNB的(intra-)change信息和所述SeNB的释放与再添加信息，即仅通过一条信令来指示UE对两个eNB的资源进行重配置。
可见，在网络相关的设计能力下，UE与SeNB间的用户面数据传输会因为UE的MeNB变更而中断。如果UE接入target eNB小区所花费的时间较长，那么UE与SeNB间的用户面数据中断时间会随之加长。这意味着网络能够为UE提供的无线资源被空置，即UE原本可以被提升的数据吞吐量受限， 进而网络的整体性能也下降了。
发明内容
本发明实施例提供一种用户设备切换基站的方法及基站、用户设备，以解决UE接入的主基站发生变更时，UE与接入的次基站间的用户面数据中断的问题。
为了解决上述技术问题，本发明实施例公开了一种用户设备切换基站的方法，包括：
当双链接用户设备(UE)的主基站发生切换时，目标基站确定UE保持与次基站间的连接与配置；
目标基站在所述UE保持与所述次基站间的连接与配置的同时，与UE建立连接。
可选地，上述方法中，所述目标基站确定所述UE保持与次基站间的连接与配置包括：
所述目标基站接收所述主基站发送的切换请求以及所述UE的次基站信息，根据所述UE的次基站信息判断切换基站后UE是否保持与次基站的连接与配置，如果判断结果为是，则确定所述UE保持与次基站间的连接与配置。
可选地，上述方法中，所述目标基站接收所述主基站发送的切换请求以及所述UE的次基站信息包括：
所述目标基站接收所述主基站发送的切换请求消息，该切换请求消息中携带有UE的次基站信息。
可选地，上述方法还包括：
若所述目标基站判断切换基站后UE保持与次基站的连接与配置，则先与所述次基站建立接口连接，再向所述主基站反馈切换请求确认以及允许UE保留与次基站的连接与配置的指示信息。
可选地，上述方法中，所述目标基站向所述主基站反馈切换请求确认以及允许UE保留与次基站的连接与配置的指示信息包括：
所述目标基站向所述主基站反馈切换请求确认消息，该切换请求确认消息中携带允许UE保留与次基站的连接与配置的指示信息。
可选地，上述方法还包括：
所述目标基站与所述UE建立连接，在所述UE已接入目标小区并启用新配置后，对UE进行用户面的数据调度，其中，所述目标基站对UE进行用户面的数据调度包括，所述目标基站经由自身与UE间的Uu口发送数据，以及所述目标基站将部分分组数据汇聚协议(PDCP)数据单元(PDU)通过所述次基站发送给所述UE。
可选地，上述方法还包括：
所述主基站接收所述目标基站发送的允许UE保留与次基站的连接与配置的指示信息后，按照所述允许UE保持与次基站间的连接及配置的指示，将原配置的分流承载的数据包继续递交给所述次基站。
可选地，上述方法还包括：
所述主基站将原配置的分流承载的数据包继续递交给所述次基站时，向所述目标基站发送数据包；或者
所述主基站将原配置的分流承载的数据包继续递交给所述次基站，直到收到UE已启用新配置的信息时，停止向所述次基站发送数据包，并开始向所述目标基站发送数据包。
可选地，上述方法还包括:
所述次基站从所述主基站接收原配置的分流承载的数据包，再从所述目标基站接收到新配置的分流承载的数据包；
所述次基站将收到的数据包按序发送给UE，其中，所述次基站接收到所述目标基站发送的新配置的分流承载的数据包，且缓存区中还有数据包未发送完时，所述次基站将缓存区中的数据包丢弃。
本发明实施例还公开了一种用户设备切换基站的方法，包括：
当双链接用户设备(UE)的主基站发生切换时，所述UE保持与次基站间的连接与配置，同时与目标基站建立连接。
可选地，上述方法中，所述UE保持与次基站间的连接与配置，同时与目标基站建立连接包括：
所述UE接收所述主基站发送的无线资源控制(RRC)连接重配置，以及保持与次基站间的连接及配置的指示；
所述UE根据该RRC连接重配置，离开源主小区，接入目标小区，同时根据保持与次基站间的连接及配置的指示保持与次基站间的连接及配置。
可选地，上述方法中，所述UE接收所述主基站发送的RRC连接重配置，以及保持与次基站间的连接及配置的指示包括：
所述UE接收RRC连接重配置消息，所述RRC连接重配置消息中包含保持与次基站间的连接及配置的指示。
可选地，上述方法还包括：
所述UE接入目标小区后，向所述主基站和/或次基站反馈已启用新配置的信息。
本发明实施例还公开了一种用户设备切换基站的方法，包括：
当双链接用户设备(UE)的主基站下主小区发生切换时，所述主基站确定所述UE保持与次基站间的连接与配置；
所述主基站指示所述UE离开源小区、接入目标小区，同时保持与次基站间的连接及配置。
可选地，上述方法中，所述主基站指示所述UE离开源小区、接入目标小区，同时保持与次基站间的连接及配置包括：
所述主基站向所述UE发送无线资源控制(RRC)连接重配置以及保持与次基站间的连接及配置的指示。
可选地，上述方法中，所述主基站向所述UE发送RRC连接重配置以及保持与次基站间的连接及配置的指示包括：
所述主基站向所述UE发送RRC连接重配置消息，所述RRC连接重配 置消息中携带保持与次基站间的连接及配置的指示。
本发明实施例还公开了一种用户设备切换基站的方法，包括：
双链接用户设备(UE)的主基站下主小区发生切换时，所述UE保持与次基站间的连接与配置，同时离开源小区、接入目标小区。
可选地，上述方法中，所述UE保持与次基站间的连接与配置，同时离开源小区、接入目标小区包括：
所述UE接收所述主基站发送的无线资源控制(RRC)连接重配置及保持与次基站间的连接及配置的指示，所述UE根据所述RRC离开源小区、接入目标小区，同时按照保持与次基站间的连接及配置的指示，保持与次基站间的连接及配置。
可选地，上述方法中，所述UE接收所述主基站发送的RRC连接重配置及保持与次基站间的连接及配置的指示包括：
所述UE接收所述主基站发送的RRC连接重配置消息，所述RRC连接重配置消息中携带保持与次基站间的连接及配置的指示。
本发明实施例还公开了一种基站设备，包括：
第一单元，设置为在双链接用户设备(UE)的主基站切换到本基站时，确定UE保持与次基站间的连接与配置；
第二单元，设置为在所述UE保持与次基站间的连接与配置的同时，与所述UE建立连接。
可选地，上述基站设备中，所述第一单元包括：
接收模块，设置为接收所述主基站发送的切换请求以及所述UE的次基站信息；
判断模块，设置为根据所述UE的次基站信息判断切换基站后UE是否保持与次基站的连接与配置；如果判断结果为是，则在双链接UE的主基站切换到本基站时，确定UE保持与次基站间的连接与配置。
可选地，上述基站设备中，所述接收模块接收所述主基站发送的切换请求以及所述UE的次基站信息包括：
接收所述主基站发送的切换请求消息，该切换请求消息中携带有UE的次基站信息。
可选地，上述基站设备中，所述第一单元还包括：
基站间建链模块，设置为在所述判断模块确定UE保持与次基站间的连接与配置时，先与所述次基站建立接口连接，再向所述主基站反馈切换请求确认以及允许UE保留与次基站的连接与配置的指示信息。
可选地，上述基站设备中，所述基站间建链模块向所述主基站反馈切换请求确认以及允许UE保留与次基站的连接与配置的指示信息包括：
向所述主基站反馈切换请求确认消息，该切换请求确认消息中携带允许UE保留与次基站的连接与配置的指示信息。
可选地，上述基站设备中，所述第二单元，还设置为在与所述UE建立连接，所述UE已接入目标小区并启用新配置后，对所述UE进行用户面的数据调度,其中，所述第二单元目对UE进行用户面的数据调度包括，经由本设备与UE间的Uu口发送数据，以及将部分分组数据汇聚协议(PDCP)数据单元(PDU)通过所述次基站发送给所述UE。
可选地，上述基站设备还包括：
第三单元，设置为在本设备为双链接UE的主基站切换到目标基站时，接收所述目标基站发送的允许UE保留与次基站的连接与配置的指示信息，并按照所述允许UE保持与次基站间的连接及配置的指示，将原配置的分流承载的数据包继续递交给所述次基站。
可选地，上述基站设备中，所述第三单元，还设置为将原配置的分流承载的数据包继续递交给所述次基站时，还向所述目标基站发送数据包；或者将原配置的分流承载的数据包继续递交给所述次基站，直到收到UE已启用新配置的信息时，先停止向所述次基站发送数据包，再向所述目标基站发送数据包。
可选地，上述基站设备还包括:
第四单元，设置为在本设备为双链接UE的次基站时，从所述主基站接收原配置的分流承载的数据包，再从所述目标基站接收新配置的分流承载的 数据包，并将收到的数据包按序发送给UE，其中，在接收到所述目标基站发送的新配置的分流承载的数据包时，若缓存区中还有数据包未发送完，则将缓存区中的数据包丢弃。
本发明实施例还公开了一种用户设备，包括：
第一单元，设置为在本设备的主基站发生切换时，保持与双链接中的次基站间的连接与配置；
第二单元，设置为在所述第一单元保持与次基站间的连接与配置的同时，与切换的目标基站建立连接。
可选地，上述用户设备还包括：
收发单元，设置为接收所述主基站发送的无线资源控制(RRC)连接重配置以及保持与次基站间的连接及配置的指示；
所述第一单元，是设置为在本设备的主基站发生切换时，按照所述保持与次基站间的连接及配置的指示，保持与双链接中的次基站间的连接与配置；
所述第二单元，是设置为在所述第一单元保持与次基站间的连接与配置的同时，按照所述RRC连接重配置离开源小区，接入目标小区。
可选地，上述用户设备中，所述收发单元接收所述主基站发送的RRC连接重配置以及保持与次基站间的连接及配置的指示包括：
所述收发单元接收RRC连接重配置消息，所述RRC连接重配置消息中携带保持与次基站间的连接及配置的指示。
可选地，上述用户设备中，所述收发单元，还设置为在本设备接入目标小区后，向所述主基站和/或次基站反馈已启用新配置的信息。
本发明实施例还公开了一种基站设备，包括：
第一单元，设置为当双链接用户设备(UE)在本基站下主小区发生切换时，确定所述UE保持与次基站间的连接与配置；
第二单元，设置为在所述第一单元确定所述UE保持与次基站间的连接与配置时，指示所述UE离开源小区、接入目标小区，同时保持与次基站间 的连接及配置。
可选地，上述基站设备中，所述第二单元指示所述UE离开源小区、接入目标小区，同时保持与次基站间的连接及配置包括：
所述第二单元，是设置为向所述UE发送无线资源控制(RRC)连接重配置，以及保持与次基站间的连接及配置的指示。
可选地，上述基站设备中，所述第二单元，是设置为向所述UE发送RRC连接重配置，，所述RRC连接重配置消息中携带保持与次基站间的连接及配置的指示。
本发明实施例还公开了一种用户设备，包括：
第一单元，设置为在本设备的主基站下主小区发生切换时，保持与次基站间的连接与配置；
第二单元，设置为在所述第一单元保持与次基站间的连接与配置的同时，离开源小区、接入目标小区。
可选地，上述用户设备还包括：
接收单元，设置为接收所述主基站发送的无线资源控制(RRC)连接重配置，以及保持与次基站间的连接及配置的指示；
所述第一单元，是设置为根据保持与次基站间的连接及配置的指示，保持与次基站间的连接与配置；
所述第二单元，是设置为在所述第一单元保持与次基站间的连接与配置的同时，根据所述RRC连接重配置消息，离开源小区、接入目标小区。
可选地，上述用户设备中，所述接收单元，设置为接收所述主基站发送的RRC连接重配置，以及保持与次基站间的连接及配置的指示包括：
所述接收单元，是设置为接收RRC主基站发送的连接重配置消息，所述RRC连接重配置消息中携带保持与次基站间的连接及配置的指示。
本发明实施例还公开了一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行上述方法。
本申请技术方案提供的异构网络中提升用户设备的数据传输性能的方案，适用于所有类型的基站，以及基站间所有类型、性能的接口。本申请技术方案，在UE传输数据和/或移动的过程中，当UE接入的主基站发生变更时，UE与接入的次基站间的用户面不会中断、即可继续传输数据。从而提升了用户设备传输数据的性能及吞吐量，并提高了无线资源的使用效率。
附图概述
图1是相关异构网络部署示意图；
图2(a)是图1所示异构网络中下行数据传输示意图；
图2(b)是图1所示异构网络中分流承载可配置的协议栈示意图；
图3是本发明实施例方案适用的场景示例图；
图4是本发明实施例一的流程示意图；
图5是本发明实施例二的流程示意图；
图6是本发明实施例三的消息示意图；
图7是本发明实施例的基站设备模块图；
图8是本发明实施例的用户设备模块图；
图9是本发明实施例的另一基站设备模块图；
图10是本发明实施例的另一用户设备模块图。
本发明的较佳实施方式
下文将结合附图对本发明实施例技术方案作进一步详细说明。需要说明的是，在不冲突的情况下，本申请的实施例和实施例中的特征可以任意相互组合。
实施例1
本申请发明人提出，UE在移动的过程中，可能会发生主基站需要变更的情况，例如图3所示，UE与第一基站(移动场景中称其为源基站)的服务小区(称为源小区)间信号质量下降、与第三基站(称为目标基站)的小区(称为目标小区)间信号质量上升；同时，UE始终处于第二基站的覆盖范围内，即UE与第二基站间的信号质量保持良好。此种情况下，源基站在请求目标基站的同意后，指示UE离开源小区、接入目标小区，并且需要指示UE接入目标小区后仍可继续与第二基站进行数据传输(即保持DC态)，以保持UE与第二基站间的数据传输。即使得目标基站成为UE新的主基站，且目标基站与第二基站间建有X2接口、并负责与核心网的每个节点间传输控制面信令和用户面数据。
基于上述思想，本实施例提供一种用户设备切换基站的方法，主要从网络侧操作进行说明，包括如下操作：
双链接UE的主基站发生切换时，目标基站确定该UE保持与次基站间的连接与配置；
目标基站在该UE保持与次基站间的连接与配置的同时，与UE建立连接。
其中，可选的，目标基站确定UE保持与次基站间的连接与配置包括：
目标基站接收主基站发送的切换请求(也可以是资源请求消息)以及该UE的次基站信息，根据UE的次基站信息判断切换基站后UE是否保持与次基站的连接与配置，即判断接纳UE后是否仍为UE保留其在次基站接入的小区及配置，如果判断结果为是，则确定UE保持与次基站间的连接与配置。其中，UE的次基站信息包括UE接入的次基站小区信息、UE对次基站小区的信号质量测量结果、以及UE在次基站侧的资源配置信息。可选地，本实施例中目标基站所收到的UE的次基站信息，可以包括在主基站所发送的切换请求消息中，也可以包括在主基站发送的现有的基站配置更新消息、新增消息或新增专用消息等。
按照上述流程操作后，如果目标基站判断切换基站后允许UE保持与次基站的连接与配置，则目标基站先与次基站建立接口连接，即向次基站发起添加辅助基站的流程，该流程的主要目的是建立能够为UE提供双连接服务 的协作接口，包括控制面与用户面隧道。然后，目标基站再向主基站回复切换请求确认以及允许UE保留与次基站的连接与配置的指示信息。而允许UE保留与次基站的连接与配置的指示信息可以包含在切换请求确认消息(也可称为接纳确认消息)中，也可以包含在现有的基站配置更新消息、新增消息或新增专用消息中。
另外，对于主基站而言，收到目标基站反馈的切换请求确认(也可称为接纳确认)消息以及允许UE保留与次基站的连接与配置的指示信息时，根据切换请求确认消息指示UE离开源小区、接入目标小区，根据允许UE保留与次基站的连接与配置的指示信息，指示UE在切换过程中保持与次基站间的连接及配置，并根据切换请求确认(即接纳确认)消息中新的资源配置信息组成面向UE的控制面信令并转发给UE。
在上述方法的基础上，当UE已接入目标小区并启用新配置后，目标基站作为该UE的主基站即可对UE进行用户面的数据调度。其中，对分流承载的发送，包括了目标基站经由自身与UE间的Uu口进行发送、以及目标基站将部分PDCP PDU递交给次基站去发送。
可选地，如果目标基站配置了UE在接入成功后会反馈分组数据汇聚协议(PDCP)状态报告，那么目标基站在接收到PDCP状态报告后，才进行数据包的重传或丢弃操作。
还要说明的是，主基站根据接收到的信息组成面向UE的控制面信令并发送给UE时，对于基站间的用户面数据包发送，主要包括主基站发送给次基站的数据包和转发给目标基站的数据包。
所述主基站发送给次基站的数据包包括：主基站在向UE发送控制面信令时还没有收到自身RLC实体指示已成功传输的PDCP PDU、主基站PDCP实体缓存区中还没有传输过的PDCP PDU、以及后续从S-GW新接收到并由PDCP实体处理后的PDCP PDU。发送行为截止于源基站收到指示UE已启用新配置的信息时。
所述主基站转发给目标基站的数据包包括：主基站在向UE发送控制面信令时还没有收到RLC实体(包括位于主基站或次基站的RLC实体)指示已成功传输的PDCP SDU、主基站PDCP实体缓存区中还没有传输过的 SDU、以及后续从S-GW新接收到的PDCP SDU。转发行为开始于主基站向UE发送基站变更的控制面信令后、或开始于产基站收到指示UE已启用新配置的信息时；转发行为结束于主基站已经将UE的所有数据包转发完毕时。
在上述流程中，次基站会先从主基站接收到PDCP PDU、再从目标基站接收到PDCP PDU，而次基站会按序将这些数据包经低层协议实体处理后发送给UE。如果次基站在接收到来自目标基站的PDCP PDU时，RLC实体缓存区中还有数据包没有发送完，次基站会将这些数据包丢弃而不再进行发送。
目标基站或UE可以将UE已启用新配置的这一信息通过X2口或Uu口指示给次基站；次基站接收到这一信息后，其RLC实体缓存区即将来自于主基站的数据包全部丢弃而不再进行发送。
可选的，主基站在获取了UE已启用新配置的信息后，可以向次基站发送一个终止标志的信息，以指示次基站不必再向UE发送数据包。该终止标志的指示信息可以是一个控制面或用户面的指示符，也可以是请求次基站释放与主基站间传输隧道的控制面消息。
对分流承载中与次基站对应的协议实体部分(包括PDCP实体)，UE在接收到的来自主基站的基站变更信令时不会立刻启用新配置，而是使用原有配置继续工作；在接入目标小区并回复了指示已启用新配置的信令后，UE的PDCP实体开始启用新的配置、而底层实体配置保持不变，对解密失败或重复的数据包丢弃。
需要说明的是，具体实施方式都是以下行数据传输来举例的，而对于上行数据的传输(若有上行承载经由第二基站传输)，UE会在接收到空口控制面信令后、至启用新的配置期间，根据第二基站分配的上行传输资源而传输承载的上行数据；次基站将接收到的上行数据递交给主基站。在次基站获取了UE已启用新配置的信息后，将接收到的上行数据递交给目标基站。
下面本实施例再提供一种用户设备切换基站的方法，其主要从用户侧的操作进行说明，该方法包括：
当双链接UE的主基站发生切换时，UE保持与次基站间的连接与配置，同时与切换的目标基站建立连接。
其中，UE保持与次基站间的连接与配置，同时与切换的目标基站建立连接，包括：
UE接收主基站发送的RRC消息以及保持与次基站间的连接及配置的指示；
UE根据该RRC消息，离开源小区，接入目标小区，同时按照保持与次基站间的连接及配置的指示，保持与次基站间的连接及配置。
在本实施例中，UE所接收的保持与次基站间的连接及配置的指示，可以包含在RRC连接重配置消息中，也可以包含在新增专用消息中。在此不作限制。
另外，考虑到次基站以及主基站的资源使用率，可以在UE接入目标小区后，向主基站和/或次基站反馈已启用新配置的信息。这样，主基站收到已启用新配置的信息后，即可向次基站发终止指示，指示次基站将缓存的主基站的数据包全部丢弃，以提高次基站资源使用率。同样地，次基站收到已启用新配置的信息后，即可直接将缓存在本地的主基站的数据包全部丢弃，同样提高资源使用率。
下面结合不同的应用场景对基站切换的整个流程(包括基站间变更程序准备阶段、基站间变更程序执行阶段以及基站间变更程序完成阶段)进行详细说明。其中，完整的基站切换流程包含了上述网络侧和用户侧的操作。
应用场景一：
在上述系统架构下，目标基站决定UE接入目标小区后仍可继续与第二基站进行数据传输，即保持DC态。源基站收到目标基站的消息后，将分流承载的PDCP PDU继续递交给第二基站，使得UE在执行第一基站的基站间变更程序期间，仍可持续与第二基站间进行用户面的数据传输。UE在接入目标小区后开始启用新的配置。具体流程如图4所示。
第一基站(即主基站，在此场景中也称为源基站)进行变更程序前UE 的用户面数据传输路径(如前所述，以下行EPS Bearer#2配置为所述分流模式为例)：源基站接收来自S-GW的EPS Bearer#2数据包，位于源基站的PDCP实体对所述数据包进行加密等封装操作。依据设定的分流策略，所述PDCP实体将部分PDCP PDU经过源基站与UE间的Uu口发送给UE、将另一部分PDCP PDU经过源基站与第二基站(即次基站)间的X2口发送给第二基站。第二基站将接收到的所述PDCP PDU经低层协议实体处理后，通过Uu口发送给UE。
第一基站的基站间变更程序准备阶段(步骤401～404)：源基站根据UE的测量上报(或其他无线资源管理功能的结果)决定将UE的主服务基站变更到目标基站去继续获得通信服务。源基站在发送给目标基站的消息1(切换请求消息)中，除了携带UE在源基站侧的资源配置等信息外，还至少携带UE的次基站信息，例如UE第二基站小区信号的测量结果、以及在第二基站侧的资源配置信息。
其中，源基站发送消息1时，相当于上述方法中UE的主基站发生切换时，可认为进入切换流程。
目标基站根据接收到的信息进行判断，如果所述目标基站决定为所述UE保留第二基站的连接且相关配置不变，则目标基站向第二基站请求建立可传输分流数据包(PDCP PDU)的用户面隧道(图4中的消息2、3为示例，目标基站与第二基站间交互的X2控制面信令的主要目的是建立必要接口，以便后续为所述UE提供DC服务)。
在同意了源基站的切换请求并与第二基站做好接口准备后，目标基站向源基站回复消息4(切换请求确认消息)，所述消息中携带新的资源配置信息、以及所述UE可继续保留第二基站的指示。
第一基站的基站间变更程序执行阶段(步骤405～408)：在收到目标基站的确认回复后，源基站向所述UE发送消息5(RRC Connection Reconfiguration消息，即无线资源控制连接重配置消息)，指示所述UE离开源小区、接入目标小区，同时保持与第二基站间的连接及配置。所述消息中携带了目标基站指示的新配置信息。
根据所述消息5的指示，UE一方面离开源小区、通过随机接入程序来 接入目标基站的目标小区，另一方面，UE对分流承载(EPS Bearer#2)与第二基站对应的相关每个协议实体仍使用旧有配置并继续工作。也就是说，UE在执行第一基站的基站间变更程序的期间，仍可继续与第二基站进行数据包的传输，并对所述数据包经由PDCP实体处理后递交给上层。
在源基站向所述UE发送了消息5后，源基站将分流承载(EPS Bearer#2)的数据包继续递交给第二基站去传输，所述数据包包括：源基站在发送消息5时还没有收到自身RLC实体指示已成功传输的PDCP PDU、源基站PDCP实体缓存区中还没有传输过的PDCP PDU、以及后续从S-GW新接收到并由PDCP实体处理后的PDCP PDU。第二基站将接收到的数据包经低层协议实体处理后通过Uu口发送给UE。
另一方面，源基站向目标基站发送消息6a(编号状态消息)并进行数据包转发，所述数据包包括：源基站在发送消息5时还没有收到RLC实体(包括位于源基站和第二基站的RLC实体)指示已成功传输的PDCP SDU、源基站PDCP实体缓存区中还没有传输过的SDU、以及后续从S-GW新接收到的PDCP SDU。这样，可以保证UE在接入目标小区后，目标基站存有数据包可以立刻发送给UE，减少了UE在用户面的等待时间。
所述UE在成功接入目标小区(步骤407)后，向目标基站发送消息8(RRC Connection Reconfiguration Complete消息，即无线资源控制连接重配置完成消息)，指示UE已启用新的配置。在收到消息8后，目标基站可以对UE进行用户面的传输调度。其中，对所述分流承载的发送，包括了目标基站经由自身与UE间的Uu口进行发送、以及目标基站将部分PDCP PDU递交给第二基站去发送。可选的，如果目标基站配置了UE在接入成功后会反馈PDCP状态报告，那么目标基站在接收到所述状态报告后，才根据所述信息进行数据包的重传或丢弃操作。
经过第一基站的基站间变更程序，第二基站会先从源基站接收到原配置的PDCP PDU、再从目标基站接收到新配置的PDCP PDU，而第二基站会按序将这些数据包发送给UE。如果第二基站在接收到来自目标基站的PDCPPDU时，RLC实体缓存区中还有数据包没有发送完，第二基站会将这些数据包丢弃而不再进行发送。可选的，目标基站或UE可以将所述UE已启用新配 置的这一信息(根据消息8)通过X2口或Uu口指示给第二基站；第二基站接收到这一信息后，其RLC实体缓存区即将来自于源基站的数据包全部丢弃而不再进行发送。
第一基站基站间变更程序完成阶段(步骤409～410)：目标基站通过触发流程9向CN节点(MME)请求用户面下行隧道端点的变更，并通知用户面上行隧道端点的信息。CN收到所述请求消息后，开始将下行数据包发送给目标基站。目标基站首先传输/重传从源基站转发来的数据包、再传输来自CN(S-GW)的数据包。在控制面上，目标基站在收到CN返回的确认消息后，向源基站发送消息10(UE上下文释放消息)，以指示基站间变更程序的成功完成、且源基站可在将数据包转发完毕后删除UE的上下文。
应用场景二：
本场景所依据的系统架构、用户面模式及移动场景同场景一相同。在UE进行第一基站的基站间变更程序的执行阶段，源基站向第二基站持续递交分流承载的PDCP PDU；而在源基站获取了UE已成功接入目标小区的信息后，开始向目标基站转发数据包。UE在接入目标小区后开始启用新的配置。具体流程如图5所示。
第一基站进行变更程序前UE的用户面数据传输路径和第一基站基站间变更程序准备阶段(步骤501)同应用场景一所述。
第一基站的基站间变更程序执行阶段(步骤502～506)：在收到目标基站的确认回复后，源基站向所述UE发送消息2(RRC Connection Reconfiguration消息)，指示所述UE离开源小区、接入目标小区，同时保持与第二基站间的连接及配置。所述消息中携带了目标基站指示的新配置信息。
根据所述消息2的指示，UE一方面离开源小区、通过随机接入程序来接入目标基站的目标小区，另一方面，UE对分流承载(EPS Bearer#2)与第二基站对应的相关每个协议实体仍使用旧有配置并继续工作。
在源基站向所述UE发送了消息2后，源基站将分流承载(EPS Bearer#2)的数据包继续递交给第二基站去传输，所述数据包包括：源基站在发送消息 2时还没有收到自身RLC实体指示已成功传输的PDCP PDU、源基站PDCP实体缓存区中还没有传输过的PDCP PDU、以及后续从S-GW新接收到并由PDCP实体处理后的PDCP PDU。第二基站将接收到的数据包经低层协议实体处理后通过Uu口发送给UE。源基站此时不会向目标基站转发数据包。
所述UE在成功接入目标小区(步骤503)后，向目标基站发送消息4(RRC Connection Reconfiguration Complete消息)，指示UE已启用新的配置。在收到消息4后，目标基站向源基站发送控制面信令(消息5)，指示UE已成功完成第一基站的变更程序且开始启用新的配置。可选的，如果第二基站通过低层协议实体可获取UE已启用新配置的这一信息，那么也可以由第二基站通过X2接口将所述信息发送给源基站。
源基站接收到所述消息5后，停止向第二基站递交数据包，并通过在变更程序准备阶段中已建立的数据转发隧道开始向目标基站进行数据转发，以及向目标基站发送消息6a(编号状态消息)。所述转发的数据包包括：源基站在发送消息5时还没有收到位于第二基站的RLC实体指示已成功传输的PDCP SDU、源基站PDCP实体缓存区中还没有传输过的SDU、以及后续从S-GW新接收到的PDCP SDU。这样，可以降低X2口传输数据包的冗余。
目标基站在接收到数据包后可以对UE进行用户面的下行传输调度。其中，对所述分流承载的发送，包括了目标基站经由自身与UE间的Uu口进行发送、以及目标基站将部分PDCP PDU递交给第二基站去发送。可选的，如果目标基站配置了UE在接入成功后会反馈PDCP状态报告，那么目标基站会根据所述状态报告的反馈信息进行数据包的重传或丢弃操作。
经过第一基站的基站间变更程序，第二基站会先从源基站接收到原配置的PDCP PDU、再从目标基站接收到新配置的PDCP PDU，而第二基站会按序将这些数据包发送给UE。如果第二基站在接收到来自目标基站的PDCPPDU时，RLC实体缓存区中还有数据包没有发送完，第二基站会将这些数据包丢弃而不再进行发送。可选的，目标基站或UE可以将所述UE已启用新配置的这一信息(根据消息4)通过X2口或Uu口指示给第二基站；第二基站接收到这一信息后，其RLC实体缓存区即将来自于源基站的数据包全部丢弃而不再进行发送。或者，可选的，源基站在获取了UE已启用新配置的信息 后，可以向第二基站发送一个终止标志的信息，以指示第二基站不必再向UE发送数据包。所述终止标志的指示信息可以是一个控制面或用户面的指示符，也可以是请求第二基站释放与源基站间传输隧道的控制面消息。
第一基站的基站间变更程序完成阶段(步骤507)：同场景一相同。
实施例2
本实施例提供一种用户设备切换基站的方法，其构思与上述实施例1相同。其是针对UE的主基站内的主小区发生变更的情况提出的，其从主基站侧的操作进行描述，主要包括如下操作：
双链接UE在主基站下主小区发生切换时，主基站确定所述UE保持与次基站间的连接与配置；
主基站指示UE离开源小区、接入目标小区，同时保持与次基站间的连接及配置。
其中，主基站向UE发送RRC以及保持与次基站间的连接及配置的指示，即认为主基站指示UE离开源小区、接入目标小区，同时保持与次基站间的连接及配置。可选地，保持与次基站间的连接及配置的指示可以包含在RRC连接重配置消息中。在其他实施例中，保持与次基站间的连接及配置的指示也可以包含在新增消息中，在此不再特别限制。
当UE已接入目标小区并启用新配置后，主基站使用新的资源配置信息为UE传输数据即可。
本实施例再提供一种用户设备切换基站的方法，与上述方法相对应，其主要从UE侧的操作进行介绍，包括如下操作：
双链接UE的主基站下主小区发生切换时，UE保持与次基站间的连接与配置，同时离开源小区、接入目标小区。
可选地，UE接收主基站发送的RRC及保持与次基站间的连接及配置的指示，然后根据RRC离开源小区、接入目标小区，同时按照保持与次基站间的连接及配置的指示，保持与次基站间的连接及配置。其中，保持与次 基站间的连接及配置的指示可以包含在主基站发送的RRC连接重配置消息中。当然，保持与次基站间的连接及配置的指示也可以包含在新增消息中，本实施例不作限制。
下面结合具体应用场景说明按照上述方法实现基站切换的过程。其中，完整的基站切换流程包含了上述方法中的基站及UE侧的操作。
本应用场景所依据的系统架构和用户面模式同实施例1中的应用场景一相同。在UE移动的过程中，所述UE在第一基站(即主基站)接入的服务小区可能要发生变更(如果所述UE在第一基站配置了载波聚合，那么本实施例所依据的场景是所述UE在第一基站的主小区发生变更)，第一基站因此决定需要对所述UE进行移动性重配置，这在本专利中称为基站内变更的一种情况。在UE进行第一基站的基站内变更程序的执行阶段，第一基站仍持续向第二基站递交分流承载的PDCP PDU。UE在重新接入第一基站的小区后开始启用新的配置。具体流程如图6所示。
第一基站进行基站内变更程序前UE的用户面数据传输路径同应用场景一相同。
步骤601：第一基站根据UE的测量上报信息，决定需要将所述UE的(主)服务小区(源小区)变更为第一基站内的其他小区(目标小区)、同时保持所述UE接入的第二基站小区及在第二基站侧的资源配置不变。第一基站向UE发送消息1(RRC Connection Reconfiguration消息)，指示所述UE离开源小区、接入目标小区，同时保持与第二基站(即次基站)间的连接及配置。所述消息中携带了新的配置信息。
其中，主基站向UE发送消息1时，即认为是上述方法中所描述的双链接UE的主基站下主小区发生切换的时刻。
同时，第一基站将分流承载(EPS Bearer#2)的数据包继续递交给第二基站去传输，所述数据包包括：第一基站在发送消息1时还没有收到自身RLC实体指示已成功传输的PDCP PDU、源基站PDCP实体缓存区中还没有传输过的PDCP PDU、以及后续从S-GW新接收到并由PDCP实体处理后的PDCP PDU。需要说明的是，网络侧此时仍采用旧有PDCP实体的配置对数据包进行封装处理。第二基站将接收到的数据包经低层协议实体处理后通过Uu口发送给UE。
步骤602：所述UE根据接收到的消息1的指示，一方面离开源小区、通过随机接入程序(步骤602)来接入目标小区，另一方面，UE对分流承载(EPS Bearer#2)与第二基站对应的相关每个协议实体仍使用旧有配置并继续工作。
步骤603，所述UE在成功接入目标小区后，向第一基站发送消息3(RRC Connection Reconfiguration Complete消息)，指示UE已开始启用新的配置。第一基站在收到所述消息3后开始使用新的配置对UE进行用户面的传输调度。其中，对所述分流承载的发送，包括了第一基站经由自身与UE间的Uu口进行发送、以及第一基站将部分PDCP PDU递交给第二基站去发送。可选的，如果第一基站配置了UE在接入成功后会反馈PDCP状态报告，那么第一基站会根据所述状态报告的反馈信息进行数据包的重传或丢弃操作。
经过第一基站的基站内变更程序，第二基站会从第一基站接先收到原配置的PDCP PDU、再接收到新配置的PDCP PDU，而第二基站会按序将这些数据包发送给UE。为了使第二基站能够将接收到的新配置PDCP PDU尽快发送给UE，第一基站或UE可以将所述UE已启用新配置的这一信息(根据消息3)通过X2口或Uu口指示给第二基站；第二基站接收到这一信息后，其RLC实体缓存区即将存储的数据包全部丢弃而不再进行发送。所述指示信息可以是一个控制面或用户面的指示符。
实施例3
本实施例提供一种基站设备，其可实现上述实施例1的方法，包括如第一单元和第二单元，如图7所示。
第一单元，设置为在双链接UE的主基站切换到本基站时，确定UE保持与次基站间的连接与配置；
其中，第一单元分为如下模块：
接收模块，设置为接收主基站发送的切换请求以及UE的次基站信息；
接收模块所接收的切换请求以及UE的次基站信息均可以包含在一条切换请求消息中，也可以从主基站所发送的现有的基站配置更新消息、或新增消息中获取UE的次基站信息。
判断模块，设置为根据UE的次基站信息判断切换基站后UE是否保持与次基站的连接与配置；如果判断结果为是，则在双链接UE的主基站切换到本基站时，确定UE保持与次基站间的连接与配置。
第二单元，设置为在UE保持与次基站间的连接与配置的同时，与UE建立连接。
其中，第二单元，还设置为与UE建立连接，UE已接入目标小区并启用新配置后，对UE进行用户面的数据调度。需要说明是，若本基站配置UE在接入成功后反馈PDCP状态报告，则该第二单元在接收到所述PDCP状态报告后，才对UE进行用户面的数据调度。
还有一些方案中，在基站设备中增加了基站间建链模块，该模块，设置为在判断模块确定UE保持与次基站间的连接与配置时，先与次基站建立接口连接，再向主基站反馈切换请求确认以及允许UE保留与次基站的连接与配置的指示信息。可选地，可向主基站反馈切换请求确认消息，该切换请求确认消息中携带允许UE保留与次基站的连接与配置的指示信息。也可以通过其他消息向主基站反馈允许UE保留与次基站的连接与配置的指示信息。而该模块的其他详细操作过程可参见实施例1的相应的内容，在此不再赘述。
上述基站设备，除了作为目标基站外，也可能作为主基站，因此，还包括第三单元，设置为在本设备为双链接UE的主基站切换到目标基站时，接收目标基站发送的允许UE保留与次基站的连接与配置的指示信息，并按照允许UE保持与次基站间的连接及配置的指示，将原配置的分流承载的数据包继续递交给次基站。
可选地，上述第三单元，还设置为将原配置的分流承载的数据包继续递 交给次基站时，向目标基站发送数据包；或者将原配置的分流承载的数据包继续递交给次基站，直到收到UE已启用新配置的信息时，先停止向次基站发送数据包，再向目标基站发送数据包。
上述基站设备，除了作为目标基站、主基站外，也可能作为次基站，因此，其还可以包括第四单元，设置为在本设备为双链接UE的次基站时，从主基站接收原配置的分流承载的数据包，再从目标基站接收到新配置的分流承载的数据包，并将收到的数据包按序发送给UE，其中，在接收到目标基站发送的新配置的分流承载的数据包时，若缓存区中还有数据包未发送完，则将缓存区中的数据包丢弃。
另外，本实施例再提供一种用户设备，如图8所示，其与上述基站设备配合操作，可实现上述实施例1的基站切换方法。该用户设备包括第一单元和第二单元。
第一单元，设置为在本设备的主基站发生切换时，保持与双链接中的次基站间的连接与配置；
第二单元，设置为在第一单元保持与次基站间的连接与配置的同时，与切换的目标基站建立连接。
实际应用中，上述用户设备还包括收发单元，设置为接收主基站发送的RRC以及保持与次基站间的连接及配置的指示。此时，第一单元，是设置为在本设备的主基站发生切换时，按照保持与次基站间的连接及配置的指示，保持与双链接中的次基站间的连接与配置；第二单元，是设置为在第一单元保持与次基站间的连接与配置的同时，按照RRC离开源小区，接入目标小区。
其中，收发单元所接收的保持与次基站间的连接及配置的指示，可以是包含在RRC连接重配置消息中，也可以是其他任何消息中。
可选地，上述收发单元，还设置为在本设备接入目标小区后，向主基站和/或次基站反馈已启用新配置的信息。发送已启用新配置的信息，主要是间接或直接指示次基站将缓存的主基站的数据包全部丢弃，以提高次基站资 源使用率。通过主基站间接进行指示的过程包括，主基站接收已启用新配置的信息，根据此信息向次基站发终止指示。
需要说明的是，虽然上述基站设备和用户设备可以配合操作完成基站切换流程，但在实际应用中，上述基站设备和用户设备为独立的，并不限于配套使用，也可分离使用。
实施例4
本实施例提供一种基站设备，如图9所示，可实现上述实施例2的方法，其包括第一单元和第二单元。
第一单元，设置为当双链接UE在本基站下主小区发生切换时，确定UE保持与次基站间的连接与配置；
第二单元，设置为在第一单元确定UE保持与次基站间的连接与配置时，指示UE离开源小区、接入目标小区，同时保持与次基站间的连接及配置。
可选地，第二单元是设置为向UE发送RRC，以及保持与次基站间的连接及配置的指示，从而指示所述UE离开源小区、接入目标小区，同时保持与次基站间的连接及配置。而第二单元向UE发送的保持与次基站间的连接及配置的指示可以包含在RRC连接重配置消息中，也可以是其它任何消息中。
由于上述基站设备可实现上述实施例2的方法，故其每个单元的详细操作可参见上述实施例2的相应内容，在此不再赘述。
本实施例再介绍一种用户设备，其与上述基站设备配合操作实现上述实施例2的方法。该用户设备包括第一单元和第二单元，如图10所示。
第一单元，设置为在本设备的主基站下主小区发生切换时，保持与次基站间的连接与配置；
第二单元，设置为在第一单元保持与次基站间的连接与配置的同时，离开源小区、接入目标小区。
可选地，该用户设备还包括接收单元，设置为接收主基站发送的RRC，以及保持与次基站间的连接及配置的指示。这样，第一单元，是设置为根据保持与次基站间的连接及配置的指示，保持与次基站间的连接与配置。第二单元，是设置为在第一单元保持与次基站间的连接与配置的同时，根据RRC消息，离开源小区、接入目标小区。
其中，接收单元所接收的保持与次基站间的连接及配置的指示，可以是在接收单元接收的RRC连接重配置消息中包含的，也可以是在其他任意消息中包含的。
还要说明的是，虽然上述基站设备和用户设备可以配合操作完成基站切换流程，但在实际应用中，上述基站设备和用户设备为独立的，并不限于配套使用，也可分离使用。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序来指令相关硬件完成，所述程序可以存储于计算机可读存储介质中，如只读存储器、磁盘或光盘等。可选地，上述实施例的全部或部分步骤也可以使用一个或多个集成电路来实现。相应地，上述实施例中的各模块/单元可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。本申请不限制于任何特定形式的硬件和软件的结合。
以上所述，仅为本发明的较佳实例而已，并非用于限定本发明的保护范围。凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
工业实用性
上述技术方案适用于所有类型的基站，以及基站间所有类型、性能的接 口。本申请技术方案，在UE传输数据和/或移动的过程中，当UE接入的主基站发生变更时，UE与接入的次基站间的用户面不会中断、即可继续传输数据，从而提升了用户设备传输数据的性能及吞吐量，并提高了无线资源的使用效率。

Claims (42)

  1. 一种用户设备切换基站的方法，包括：
    当双链接用户设备(UE)的主基站发生切换时，目标基站确定所述UE保持与次基站间的连接与配置；
    所述目标基站在所述UE保持与所述次基站间的连接与配置的同时，与所述UE建立连接。
  2. 如权利要求1所述的方法，其中，所述目标基站确定所述UE保持与次基站间的连接与配置，包括：
    所述目标基站接收所述主基站发送的切换请求以及所述UE的次基站信息，根据所述UE的次基站信息判断切换基站后UE是否保持与次基站的连接与配置，如果判断结果为是，则确定所述UE保持与次基站间的连接与配置。
  3. 如权利要求2所述的方法，其中，所述目标基站接收所述主基站发送的切换请求以及所述UE的次基站信息包括：
    所述目标基站接收所述主基站发送的切换请求消息，该切换请求消息中携带有UE的次基站信息。
  4. 如权利要求2或3所述的方法，该方法还包括：
    若所述目标基站判断切换基站后UE保持与次基站的连接与配置，则先与所述次基站建立接口连接，再向所述主基站反馈切换请求确认以及允许UE保留与次基站的连接与配置的指示信息。
  5. 如权利要求4所述的方法，其中，所述目标基站向所述主基站反馈切换请求确认以及允许UE保留与次基站的连接与配置的指示信息包括：
    所述目标基站向所述主基站反馈切换请求确认消息，该切换请求确认消息中携带允许UE保留与次基站的连接与配置的指示信息。
  6. 如权利要求4所述的方法，该方法还包括：
    所述目标基站与所述UE建立连接，在所述UE已接入目标小区并启用新配置后，对UE进行用户面的数据调度，其中，所述目标基站对UE进行用户面的数据调度包括，所述目标基站经由自身与UE间的Uu口发送数据，以及所述目标基站将部分分组数据汇聚协议(PDCP)数据单元(PDU)通过所述次基站发送给所述UE。
  7. 如权利要求4所述的方法，该方法还包括：
    所述主基站接收所述目标基站发送的允许UE保留与次基站的连接与配置的指示信息后，按照所述允许UE保持与次基站间的连接及配置的指示，将原配置的分流承载的数据包继续递交给所述次基站。
  8. 如权利要求7所述的方法，该方法还包括：
    所述主基站将原配置的分流承载的数据包继续递交给所述次基站时，向所述目标基站发送数据包；或者
    所述主基站将原配置的分流承载的数据包继续递交给所述次基站，直到收到UE已启用新配置的信息时，停止向所述次基站发送数据包，并开始向所述目标基站发送数据包。
  9. 如权利要求7所述的方法，该方法还包括:
    所述次基站从所述主基站接收原配置的分流承载的数据包，再从所述目标基站接收到新配置的分流承载的数据包；
    所述次基站将收到的数据包按序发送给UE，其中，所述次基站接收到所述目标基站发送的新配置的分流承载的数据包，且缓存区中还有数据包未发送完时，所述次基站将缓存区中的数据包丢弃。
  10. 一种用户设备切换基站的方法，包括：
    当双链接用户设备(UE)的主基站发生切换时，所述UE保持与次基站间的连接与配置，同时与目标基站建立连接。
  11. 如权利要求10所述的方法，其中，所述UE保持与次基站间的连接与配置，同时与目标基站建立连接包括：
    所述UE接收所述主基站发送的无线资源控制(RRC)连接重配置，以及保持与次基站间的连接及配置的指示；
    所述UE根据该RRC连接重配置，离开源主小区，接入目标小区，同时根据保持与次基站间的连接及配置的指示保持与次基站间的连接及配置。
  12. 如权利要求10或11所述的方法，其中，所述UE接收所述主基站发送的RRC连接重配置，以及保持与次基站间的连接及配置的指示包括：
    所述UE接收RRC连接重配置消息，所述RRC连接重配置消息中包含保持与次基站间的连接及配置的指示。
  13. 如权利要求10所述的方法，该方法还包括：
    所述UE接入目标小区后，向所述主基站和/或次基站反馈已启用新配置的信息。
  14. 一种用户设备切换基站的方法，包括：
    当双链接用户设备(UE)的主基站下主小区发生切换时，所述主基站确定所述UE保持与次基站间的连接与配置；
    所述主基站指示所述UE离开源小区、接入目标小区，同时保持与次基站间的连接及配置。
  15. 如权利要求14所述的方法，其中，所述主基站指示所述UE离开源小区、接入目标小区，同时保持与次基站间的连接及配置包括：
    所述主基站向所述UE发送无线资源控制(RRC)连接重配置以及保持与次基站间的连接及配置的指示。
  16. 如权利要求15所述的方法，其中，所述主基站向所述UE发送RRC连接重配置以及保持与次基站间的连接及配置的指示包括：
    所述主基站向所述UE发送RRC连接重配置消息，所述RRC连接重配置消息中携带保持与次基站间的连接及配置的指示。
  17. 一种用户设备切换基站的方法，包括：
    双链接用户设备(UE)的主基站下主小区发生切换时，所述UE保持与次基站间的连接与配置，同时离开源小区、接入目标小区。
  18. 如权利要求17所述的方法，其中，所述UE保持与次基站间的连接与配置，同时离开源小区、接入目标小区包括：
    所述UE接收所述主基站发送的无线资源控制(RRC)连接重配置及保持与次基站间的连接及配置的指示，所述UE根据所述RRC离开源小区、接入目标小区，同时按照保持与次基站间的连接及配置的指示，保持与次基站间的连接及配置。
  19. 如权利要求18所述的方法，其中，所述UE接收所述主基站发送的RRC连接重配置及保持与次基站间的连接及配置的指示包括：
    所述UE接收所述主基站发送的RRC连接重配置消息，所述RRC连接重配置消息中携带保持与次基站间的连接及配置的指示。
  20. 一种基站设备，包括：
    第一单元，设置为在双链接用户设备(UE)的主基站切换到本基站时，确定UE保持与次基站间的连接与配置；
    第二单元，设置为在所述UE保持与次基站间的连接与配置的同时，与所述UE建立连接。
  21. 如权利要求20所述的设备，其中，所述第一单元包括：
    接收模块，设置为接收所述主基站发送的切换请求以及所述UE的次基站信息；
    判断模块，设置为根据所述UE的次基站信息判断切换基站后UE是否保持与次基站的连接与配置；如果判断结果为是，则在双链接UE的主基站切换到本基站时，确定UE保持与次基站间的连接与配置。
  22. 如权利要求21所述的设备，其中，所述接收模块接收所述主基站发送的切换请求以及所述UE的次基站信息包括：
    接收所述主基站发送的切换请求消息，该切换请求消息中携带有UE的 次基站信息。
  23. 如权利要求21或22所述的设备，所述第一单元还包括：
    基站间建链模块，设置为在所述判断模块确定UE保持与次基站间的连接与配置时，先与所述次基站建立接口连接，再向所述主基站反馈切换请求确认以及允许UE保留与次基站的连接与配置的指示信息。
  24. 如权利要求23所述的设备，其中，所述基站间建链模块向所述主基站反馈切换请求确认以及允许UE保留与次基站的连接与配置的指示信息包括：
    向所述主基站反馈切换请求确认消息，该切换请求确认消息中携带允许UE保留与次基站的连接与配置的指示信息。
  25. 如权利要求23所述的设备，
    所述第二单元，还设置为在与所述UE建立连接，所述UE已接入目标小区并启用新配置后，对所述UE进行用户面的数据调度,其中，所述第二单元目对UE进行用户面的数据调度包括，经由本设备与UE间的Uu口发送数据，以及将部分分组数据汇聚协议(PDCP)数据单元(PDU)通过所述次基站发送给所述UE。
  26. 如权利要求23所述的设备，还包括：
    第三单元，设置为在本设备为双链接UE的主基站切换到目标基站时，接收所述目标基站发送的允许UE保留与次基站的连接与配置的指示信息，并按照所述允许UE保持与次基站间的连接及配置的指示，将原配置的分流承载的数据包继续递交给所述次基站。
  27. 如权利要求26所述的设备，
    所述第三单元，还设置为将原配置的分流承载的数据包继续递交给所述次基站时，还向所述目标基站发送数据包；或者将原配置的分流承载的数据包继续递交给所述次基站，直到收到UE已启用新配置的信息时，先停止向所述次基站发送数据包，再向所述目标基站发送数据包。
  28. 如权利要求23所述的设备，还包括:
    第四单元，设置为在本设备为双链接UE的次基站时，从所述主基站接收原配置的分流承载的数据包，再从所述目标基站接收新配置的分流承载的数据包，并将收到的数据包按序发送给UE，其中，在接收到所述目标基站发送的新配置的分流承载的数据包时，若缓存区中还有数据包未发送完，则将缓存区中的数据包丢弃。
  29. 一种用户设备，包括：
    第一单元，设置为在本设备的主基站发生切换时，保持与双链接中的次基站间的连接与配置；
    第二单元，设置为在所述第一单元保持与次基站间的连接与配置的同时，与切换的目标基站建立连接。
  30. 如权利要求29所述的设备，还包括：
    收发单元，设置为接收所述主基站发送的无线资源控制(RRC)连接重配置以及保持与次基站间的连接及配置的指示；
    所述第一单元，是设置为在本设备的主基站发生切换时，按照所述保持与次基站间的连接及配置的指示，保持与双链接中的次基站间的连接与配置；
    所述第二单元，是设置为在所述第一单元保持与次基站间的连接与配置的同时，按照所述RRC连接重配置离开源小区，接入目标小区。
  31. 如权利要求30所述的设备，其中，所述收发单元接收所述主基站发送的RRC连接重配置以及保持与次基站间的连接及配置的指示包括：
    所述收发单元接收RRC连接重配置消息，所述RRC连接重配置消息中携带保持与次基站间的连接及配置的指示。
  32. 如权利要求31所述的设备，
    所述收发单元，还设置为在本设备接入目标小区后，向所述主基站和/或次基站反馈已启用新配置的信息。
  33. 一种基站设备，包括：
    第一单元，设置为当双链接用户设备(UE)在本基站下主小区发生切换时，确定所述UE保持与次基站间的连接与配置；
    第二单元，设置为在所述第一单元确定所述UE保持与次基站间的连接与配置时，指示所述UE离开源小区、接入目标小区，同时保持与次基站间的连接及配置。
  34. 如权利要求33所述的设备，其中，所述第二单元指示所述UE离开源小区、接入目标小区，同时保持与次基站间的连接及配置包括：
    所述第二单元，是设置为向所述UE发送无线资源控制(RRC)连接重配置，以及保持与次基站间的连接及配置的指示。
  35. 如权利要求34所述的设备，其中，
    第二单元，是设置为向UE发送RRC连接重配置消息，所述RRC连接重配置消息中携带保持与次基站间的连接及配置的指示。
  36. 一种用户设备，包括：
    第一单元，设置为在本设备的主基站下主小区发生切换时，保持与次基站间的连接与配置；
    第二单元，设置为在所述第一单元保持与次基站间的连接与配置的同时，离开源小区、接入目标小区。
  37. 如权利要求36所述的设备，还包括：
    接收单元，设置为接收所述主基站发送的无线资源控制(RRC)连接重配置，以及保持与次基站间的连接及配置的指示；
    所述第一单元，是设置为根据保持与次基站间的连接及配置的指示，保持与次基站间的连接与配置；
    所述第二单元，是设置为在所述第一单元保持与次基站间的连接与配置的同时，根据所述RRC连接重配置消息，离开源小区、接入目标小区。
  38. 如权利要求37所述的设备，其中，所述接收单元，设置为接收所述主基站发送的RRC连接重配置，以及保持与次基站间的连接及配置的指示包括：
    所述接收单元，是设置为接收主基站发送的RRC连接重配置消息，所述RRC连接重配置消息中携带保持与次基站间的连接及配置的指示。
  39. 一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行权利要求1～9中任一项所述的方法。
  40. 一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行权利要求10～13中任一项所述的方法。
  41. 一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行权利要求14～16中任一项所述的方法。
  42. 一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行权利要求17～19中任一项所述的方法。
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