WO2016138798A1 - 一种在切换程序中传输数据的方法、装置和系统 - Google Patents

一种在切换程序中传输数据的方法、装置和系统 Download PDF

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Publication number
WO2016138798A1
WO2016138798A1 PCT/CN2016/070313 CN2016070313W WO2016138798A1 WO 2016138798 A1 WO2016138798 A1 WO 2016138798A1 CN 2016070313 W CN2016070313 W CN 2016070313W WO 2016138798 A1 WO2016138798 A1 WO 2016138798A1
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Prior art keywords
base station
primary base
terminal
secondary base
pdcp
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English (en)
French (fr)
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王昕�
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ZTE Corp
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ZTE Corp
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Priority to EP16758415.0A priority Critical patent/EP3253122A4/en
Priority to US15/555,659 priority patent/US20180049091A1/en
Publication of WO2016138798A1 publication Critical patent/WO2016138798A1/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • 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
    • H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
    • 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
    • H04W36/00695—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using split of the control plane or user plane
    • 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
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • 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
    • 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
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections

Definitions

  • This document relates to, but is not limited to, the field of mobile communication technologies, and in particular, to a method, device and system for transmitting data in a handover procedure.
  • the Third Generation Partnership Projects (3GPP) considers that the deployment of a small cell (a cell established by a low-power base station, a cell that is different from a macro cell established by a macro base station, and a small cell is usually called a Small Cell) Enhancements in capabilities are one of the most interesting topics in the future development of communication networks.
  • a heterogeneous network deployment scenario generally recognized by the communications industry is to deploy low-power nodes within the coverage or boundary of the macro base station, and together form an evolved universal terrestrial radio access network (Evolved Universal Terrestrial Radio Access Network).
  • the access network (Radio Access Network, RAN for short) in the E-UTRAN system provides a joint data transmission service for User Equipment (UE).
  • UE User Equipment
  • an mobility management entity MME for short
  • MME mobility management Entity
  • CN core network
  • S1-MME interface 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).
  • MeNB master base station
  • SeNB secondary base station
  • a wireless Uu interface is built between the UE and the MeNB and the SeNB. The interface can transmit control plane signaling and user plane data. This state is also called the dual connectivity state (DC).
  • DC dual connectivity state
  • the system architecture shown in FIG. 1 enables two (or even multiple) base stations to simultaneously provide radio resources for one UE to perform communication services, and the data throughput of the network is greatly improved, and the user can try to satisfy the increasing data of the user. The need for speed.
  • Evolved Packet System (EPS) bearer #1 (bearer#1)
  • S-GW Serving Gateway
  • MeNB sends the data packet to the MeNB through the S1-U interface
  • MeNB sends the data packet to the UE through the Uu interface
  • this EPS bearer #1 is only located in the MeNB and only uses the bearer of the MeNB resource, called MCG bearer.
  • EPS bearer #2 (bearer#2) indicates a data stream set up between the S-GW and the UE.
  • the data stream needs to pass through the base station in the access network.
  • the transmission of EPS bearer#2 is passed by the S-GW.
  • the S1-U interface sends the data packet to the MeNB
  • the MeNB sends only part of the data packet of the bearer to the UE through the Uu interface, and another part of the data packet is delivered to the SeNB through the X2 interface, and then the SeNB transmits the part through the Uu interface.
  • the data packet is sent to the UE; the bearer of the EPS bearer #2 is located in the MeNB and the SeNB, and the bearer needs to use the resources of the MeNB and the SeNB for transmission, and is called a split bearer.
  • the Split bearer configures a Packet Data Convergence Protocol (PDCP) entity located in the MeNB, and two sets of independent radio link control respectively configured in the MeNB and the SeNB ( Radio Link Control (RLC) entity, Medium Access Control (MAC) entity, and Physical Layer (PHY).
  • RLC Radio Link Control
  • MAC Medium Access Control
  • PHY Physical Layer
  • each received RLC PDU is delivered to a unified PDCP entity to perform further transmission operations.
  • eNB referred to as target base station, target eNB
  • the two scenarios need to be intra-eNB handover (the intra-eNB handover, the UE still establishes a connection with the same eNB before and after the handover, only some parameters are re-allocated) or inter-eNB handover (inter-eNB handover, A program is established in which the UE establishes a connection with a different eNB before and after the handover.
  • the SeNB of the UE when the MeNB of the UE in the DC state needs to perform handover, according to the related technology, the SeNB of the UE is released before the handover procedure or during the handover procedure. If, after the UE accesses the target eNB (for the intra-eNB handover, the target eNB is the original MeNB), there is still a base station node with suitable service requirements and conditions, and the target eNB adds the SeNB to the UE.
  • the MeNB may simultaneously carry the (intra-) handover information of the MeNB and the release of the SeNB in one control plane signaling. The information is further added, that is, the UE is instructed to reconfigure the resources of the two eNBs by using only one air interface control plane signaling.
  • the user plane data transmission between the UE and the SeNB is interrupted due to the MeNB handover of the UE.
  • the Intra-MeNB handover procedure 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 also 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, and the overall service performance of the network is also degraded.
  • Embodiments of the present invention provide a method, apparatus, and system for transmitting data in a handover procedure to maintain user plane data transmission in a handover procedure.
  • the embodiment of the invention provides a method for transmitting data in a handover procedure, which is applied to a terminal, and includes:
  • Radio resource control signaling sent by the source primary base station, where the radio resource control signaling carries first resource configuration information corresponding to the target primary base station to be accessed by the terminal, and corresponding to the secondary base station that the terminal has accessed Second resource configuration information;
  • the terminal leaves the serving cell covered by the source primary base station, maintaining a wireless connection with the serving cell of the secondary base station according to the second resource configuration information, and retaining the shared bearer corresponding to the secondary base
  • the protocol layer of the station is unchanged, and random access is initiated to the target primary base station according to the first resource configuration information.
  • the reserved bearer is further included:
  • initiating random access to the target primary base station according to the first resource configuration information includes:
  • the serving cell of the target primary base station initiates random access.
  • the transmitting, by the secondary base station, the user plane data of the shared bearer includes:
  • the embodiment of the invention further provides a method for transmitting data in a handover procedure, which is applied to a target primary base station, and includes:
  • the method further includes: receiving, by the source primary base station, a service data unit SDU of the unsuccessfully transmitted data packet convergence protocol PDCP, a buffered PDCP SDU, and a subsequently received PDCP SDU, the unsuccessfully transmitted PDCP SDU Included that the PDCP sublayer located at the source primary base station does not receive the PDCP SDU indicating that the terminal or the secondary base station indicates successful transmission, and the buffered PDCP SDU includes the PDCP sublayer buffer located at the source primary base station not transmitted to the a PDCP SDU of the RLC sublayer of the terminal or the secondary base station, where the subsequently received PDCP SDU includes a PDCP SDU received by the terminal from the serving gateway after leaving the serving cell covered by the source primary base station.
  • the method further includes: receiving, by the source primary base station, a PDCP SDU corresponding to the shared bearer, and receiving the received PDCP SDU corresponding to the shared bearer by the target primary base station. After the PDCP sublayer of the shared bearer is processed, it is forwarded to the secondary base station.
  • the embodiment of the invention further provides a method for transmitting data in a handover procedure, which is applied to a secondary base station, and includes:
  • the wireless connection with the terminal is maintained according to the second resource configuration information corresponding to the secondary base station that the terminal has accessed, and the protocol layer of the shared base station remains unchanged.
  • the method further includes: receiving a notification of the target primary base station, and deleting the protocol layer of the shared bearer at the secondary base station.
  • deleting the protocol layer of the shared bearer in the secondary base station includes:
  • the base station shares the resources of the bearer.
  • the method further includes: receiving a PDCP PDU sent by the target primary base station, and sending the PDCP PDU to the terminal by using a wireless connection with the terminal.
  • the embodiment of the invention further provides an apparatus for transmitting data in a switching program, which is installed in the terminal, and includes:
  • the receiving module is configured to receive the radio resource control signaling sent by the source primary base station, where the radio resource control signaling carries the first resource configuration information corresponding to the target primary base station to be accessed by the terminal, and is connected to the terminal Second resource configuration information corresponding to the entered secondary base station;
  • a transmission module configured to: when the terminal leaves the serving cell covered by the source primary base station, maintain a wireless connection with the serving cell of the secondary base station according to the second resource configuration information, and reserve the shared bearer corresponding to the secondary base station The protocol layer is unchanged;
  • the access module is configured to initiate random access to the target primary base station according to the first resource configuration information when the terminal leaves the serving cell covered by the source primary base station.
  • the transmission module is further configured to:
  • the access module is set to:
  • the transmitting module is configured to perform transmission of user plane data of the shared bearer with the secondary base station by:
  • the embodiment of the invention further provides an apparatus for transmitting data in a handover procedure, which is set in the target primary base station, and includes:
  • An allocation module configured to allocate resources according to a judgment result obtained in a preparation phase of the terminal switching procedure
  • a sending unit configured to send a handover request acknowledgement message to the source primary base station, where the handover request acknowledgement carries the first resource configuration information corresponding to the target primary base station and the second resource corresponding to the secondary base station that the terminal has accessed Configuration information.
  • the apparatus further includes: a first communication module, configured to receive a service data unit SDU, a buffered PDCP SDU, and a subsequently received PDCP SDU of the data packet aggregation protocol PDCP that the source primary base station sends unsuccessfully transmitted,
  • the PDCP SDU that is not successfully transmitted includes a PDCP SDU that is not received by the PDCP sublayer of the source primary base station or that indicates the successful transmission by the secondary base station, and the buffered PDCP SDU includes the PDCP located at the source primary base station.
  • the sub-layer buffer is not transmitted to the terminal or the PDCP SDU of the RLC sub-layer of the secondary base station, and the subsequently received PDCP SDU includes the terminal receiving the serving cell covered by the source primary base station and receiving from the serving gateway To the PDCP SDU.
  • the first communication module is further configured to receive a PDCP SDU corresponding to the shared bearer sent by the source primary base station, and receive the received PDCP SDU corresponding to the shared bearer through the target primary base station. After the PDCP sublayer processing of the shared bearer is processed, it is forwarded to the secondary base station.
  • the embodiment of the invention further provides an apparatus for transmitting data in a handover procedure, which is set in the secondary base station, and includes:
  • the processing module is configured to save the second resource configuration information corresponding to the secondary base station that the terminal has accessed.
  • the wireless connection with the terminal is maintained, and the protocol layer of the secondary bearer remains unchanged.
  • the device further includes a release module, configured to accept the notification of the target primary base station, and delete the protocol layer of the shared bearer at the secondary base station.
  • a release module configured to accept the notification of the target primary base station, and delete the protocol layer of the shared bearer at the secondary base station.
  • the release module is configured to:
  • the base station shares the resources of the bearer.
  • the device further includes: a second communication module, configured to receive a PDCP PDU sent by the target primary base station, and send the PDCP PDU to the terminal by using a wireless connection with the terminal.
  • a second communication module configured to receive a PDCP PDU sent by the target primary base station, and send the PDCP PDU to the terminal by using a wireless connection with the terminal.
  • the embodiment of the invention further provides a system for transmitting data in a handover procedure, comprising: the foregoing terminal, a source primary base station, a target primary base station, and a secondary base station,
  • the source primary base station includes:
  • the communication module is configured to receive a handover request acknowledgement message sent by the target primary base station, and send the radio resource control signaling to the terminal.
  • the embodiment of the invention further provides 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 embodiment of the present invention can improve data transmission performance between the user equipment and the secondary base station when the primary serving base station of the user equipment performs handover, and is applicable to various types of base stations, and transmits data and/or in the DC state UE.
  • the primary serving base station accessed by the UE is switched, the user plane between the UE and the connected secondary base station can continue to transmit data without interruption.
  • the performance and throughput of the user equipment transmission data are improved, the use efficiency of the radio resources is improved, and control plane signaling is saved.
  • FIG. 1 is a schematic structural diagram of a heterogeneous network system according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a suitable user plane transmission and protocol stack according to an embodiment of the present invention
  • FIG. 3 is a diagram showing an example of an applicable inter-base station handover scenario according to an embodiment of the present invention.
  • FIG. 4 is a flowchart of a method for transmitting data in a handover procedure applied to a terminal according to an embodiment of the present invention
  • FIG. 5 is a flowchart of a method for transmitting data in a handover procedure applied to a source primary base station according to an embodiment of the present invention
  • FIG. 6 is a flowchart of a method for transmitting data in a handover procedure applied to a target primary base station according to an embodiment of the present invention
  • FIG. 7 is a flowchart of a method for transmitting data in a handover procedure applied to a secondary base station according to an embodiment of the present invention
  • FIG. 8 is a schematic structural diagram of an apparatus for transmitting data in a handover procedure provided in a terminal according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of an apparatus for transmitting data in a handover procedure provided to a source primary base station according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of an apparatus for transmitting data in a handover procedure provided to a target primary base station according to an embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of an apparatus for transmitting data in a handover procedure provided in a secondary base station according to an embodiment of the present invention.
  • FIG. 12 is a schematic flowchart of Embodiment 1 of the present invention.
  • FIG. 14 is a schematic diagram of a message according to Embodiment 3 of the present invention.
  • the source primary base station and the secondary base station have a wireless connection; the source primary base station and the secondary base station may be various types of base stations, and an interface (such as an X2 port) is established between the two.
  • Control plane signaling and user plane data may be transmitted between the UE and the source primary base station, and at least user plane data may be transmitted between the UE and the secondary base station.
  • the system architecture, the user plane transmission model, and the protocol stack format may be referred to the examples in FIG. 1 and FIG. 2 and related descriptions.
  • the source primary base station may be equivalent to the MeNB, and the secondary base station may be equivalent to the SeNB.
  • the solution in the embodiment of the present invention is not limited to the number of SeNBs, that is, if the UE accesses multiple base stations at the same time, the solution is also applicable.
  • the signal quality is degraded between the serving cell (referred to as the source cell) of the first base station (referred to as the source primary base station) and the third base station (referred to as the target primary base station).
  • the signal quality between the serving cell (referred to as the target cell) increases; at the same time, the UE is always within the coverage of the secondary base station, that is, the signal quality between the UE and the secondary base station cell remains good.
  • the source primary base station After requesting the consent of the target primary base station, the source primary base station instructs the UE to leave the source cell and the access target cell, and has an X2 interface between the target primary base station and the secondary base station, and is responsible for transmitting control planes to the UE between the nodes of the core network. Signaling and user plane data.
  • the handover procedure causes the target primary base station to become the new primary serving base station of the UE.
  • an embodiment of the present invention provides a method for transmitting data in a handover procedure, which is applied to a terminal, including:
  • Radio resource control signaling sent by the source primary base station, where the radio resource control signaling carries first resource configuration information corresponding to the target primary base station to be accessed by the terminal, and corresponding to the secondary base station that the terminal has accessed Second resource configuration information;
  • the first resource configuration information and the second resource configuration information include indication information for establishing or modifying or releasing a radio bearer, and modifying indication information of the MAC and PHY configuration.
  • the wireless connection with the serving cell of the secondary base station is maintained according to the second resource configuration information, and the protocol layer of the reserved bearer corresponding to the secondary base station remains unchanged. And initiating random access to the target primary base station according to the first resource configuration information.
  • the reserved bearer is further included:
  • initiating random access to the target primary base station according to the first resource configuration information includes:
  • the serving cell of the target primary base station initiates random access.
  • the transmitting, by the secondary base station, the user plane data of the shared bearer includes:
  • the embodiment of the invention further provides 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.
  • an embodiment of the present invention provides a method for transmitting data in a handover procedure, which is applied to a source primary base station, and includes:
  • the handover request acknowledgement carries first resource configuration information connected to the target primary base station and second resources of a secondary base station connected to both the source primary base station and the target primary base station Configuration information.
  • the first resource configuration information and the second resource configuration information include indication information for establishing or modifying or releasing a radio bearer, and modifying indication information of the MAC and PHY configuration.
  • the source primary base station further sends a data packet to the target primary base station, where the data packet includes: a service data unit (SDU) of the unsuccessfully transmitted data packet aggregation protocol PDCP, a buffered PDCP SDU, and a subsequent Received PDCP SDU;
  • SDU service data unit
  • the PDCP SDU that is not successfully transmitted includes a PDCP SDU that is not received by the PDCP sublayer of the source primary base station or that is successfully transmitted by the secondary base station; the buffered PDCP SDU includes a PDCP located at the source primary base station.
  • the sub-layer buffer is not transmitted to the terminal or the PDCP SDU of the RLC sub-layer of the secondary base station; the subsequently received PDCP SDU includes the terminal receiving the serving cell covered by the source primary base station and receiving from the serving gateway To the PDCP SDU.
  • the data packet forwarded by the source primary base station to the target primary base station includes: when the source primary base station sends the RRC signaling to the UE, the PDCP entity of each data bearer located at the source primary base station has not received the corresponding RLC entity (The RCP entity located at the secondary base station may be included to indicate the PDCP SDU that has been successfully transmitted, the SDU that has not been transmitted in the source primary base station PDCP physical buffer, and the PDCP SDU that is subsequently newly received from the S-GW.
  • the forwarding behavior ends when the source primary base station has forwarded all the data packets that need to be forwarded by the UE.
  • the embodiment of the invention further provides 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 embodiment of the present invention provides a method for transmitting data in a handover procedure, which is applied to a target primary base station, and includes:
  • the first resource configuration information and the second resource configuration information include indication information for establishing or modifying or releasing a radio bearer, and modifying indication information of the MAC and PHY configuration.
  • the target primary base station further receives a data packet sent by the source primary base station, where the data packet includes a service data unit SDU of the unsuccessfully transmitted data packet convergence protocol PDCP, a buffered PDCP SDU, and a subsequently received PDCP SDU. .
  • the data packet includes a service data unit SDU of the unsuccessfully transmitted data packet convergence protocol PDCP, a buffered PDCP SDU, and a subsequently received PDCP SDU.
  • the PDCP SDU that is not successfully transmitted includes a PDCP SDU that is not received by the PDCP sublayer of the source primary base station or that is successfully transmitted by the secondary base station; the buffered PDCP SDU includes a PDCP located at the source primary base station.
  • the sub-layer buffer is not transmitted to the terminal or the PDCP SDU of the RLC sub-layer of the secondary base station; the subsequently received PDCP SDU includes the terminal receiving the serving cell covered by the source primary base station and receiving from the serving gateway To the PDCP SDU.
  • the method further includes: the target primary base station receives the PDCP SDU corresponding to the shared bearer sent by the source primary base station; and the target primary base station passes the received PDCP SDU corresponding to the shared bearer to the target primary base station. After the PDCP sublayer of the shared bearer is processed, it is forwarded to the Said base station.
  • the target primary base station determines whether the UE is allowed to access in the preparation phase of the terminal handover procedure, whether there is a bearer to be deleted, and whether there is a change in the bearer type (for example, MCG bearer ⁇ ->split bearer).
  • the target primary base station transmits control plane signaling and user plane data to the terminal.
  • the target primary base station performs resource allocation according to the judgment result obtained in the preparation phase of the handover procedure, and returns a handover request acknowledgement message to the source primary base station, where the handover request acknowledgement message carries at least the UE in the target primary base station and the secondary base station.
  • Resource configuration information may simply indicate that the connection and the resource configuration are unchanged.
  • the source primary base station forms a Radio Resource Control (RRC) signaling for the UE according to the received message and sends the signal to the UE.
  • RRC Radio Resource Control
  • the UE leaves the serving cell of the source primary base station, and reconstructs/resets the protocol entity corresponding to the protocol stack of the source primary base station of the MCG bearer and the split bearer according to the new configuration, and Synchronizing with the target cell and initiating random access to the target cell; on the other hand, the UE maintains the wireless connection with the secondary base station cell and the protocol entity corresponding to the protocol stack of the secondary bearer that remains in the secondary base station remains unchanged
  • the transmission of the user plane data related to the Split bearer still remaining in the secondary base station may be continued according to the scheduling of the secondary base station.
  • the embodiment of the invention further provides 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.
  • an embodiment of the present invention provides a method for transmitting data in a handover procedure, which is applied to a secondary base station, including:
  • the wireless connection with the terminal is maintained according to the second resource configuration information, and the protocol layer of the secondary bearer remains unchanged.
  • the secondary base station further deletes the protocol layer that is carried in the secondary base station.
  • the deleting the protocol layer carried in the secondary base station includes:
  • the protocol data unit PDU and/or the resource corresponding to the shared bearer is allocated; the resource corresponding to the shared bearer refers to a resource that is no longer reserved in the secondary base station.
  • This step is made by the control plane and is determined by the target primary base station.
  • the secondary base station accepts the notification execution of the target primary base station.
  • the secondary base station receives the PDCP PDU sent by the target primary base station, and sends the PDCP PDU to the terminal by using a wireless connection with the terminal.
  • the SDU is a data packet that has just been received by the protocol sublayer and has not been encapsulated by the protocol layer.
  • the PDU is a data packet that is encapsulated by the protocol sublayer and is about to be sent to the next protocol sublayer.
  • the source primary base station sends the PDCP SDU to the target primary base station, and the target primary base station hands the processed PDCP PDUs to the secondary base station (RLC sublayer) for further transmission.
  • RLC sublayer secondary base station
  • the release of the X2 interface related to the UE between the source primary base station and the secondary base station may be triggered by the active primary base station or the secondary base station.
  • the secondary base station clears the PDU.
  • the resource configuration is unchanged; for the split bearer that is no longer reserved in the secondary base station, the secondary base station releases the resources corresponding to the bearer.
  • the target primary base station For the Split bearer that still remains in the secondary base station transmission, the target primary base station performs PDCP processing and encapsulation on the received forwarding data packet, and delivers the data to the secondary base station for transmission. If the secondary base station receives the first PDCP PDU from the target primary base station, if there are still data packets in the RLC entity buffer corresponding to the Split bearer, the secondary base station discards the data packets and does not send them. That is, the secondary base station will transmit the data packet from the target primary base station as soon as possible.
  • the shared bearer remains in the original base station, then the secondary base station clears the buffered data packet at the appropriate time (at the latest when the data packet sent by the target primary base station is received), but the corresponding resource is not released, and will continue to work. ;
  • the shared bearer is no longer transmitted at the original base station after the handover of the primary base station (possibly only at the target primary base station or by other secondary base stations), then after receiving the control plane signaling of the target primary base station, the original base station is emptied. Packets and release resources;
  • the target primary base station If the shared bearer is not accepted by the target primary base station, that is, it is to be released as a whole, then after receiving the control plane signaling of the target primary base station, the original base station clears the data packet and releases the resource.
  • the method of the embodiment of the present invention is applicable to a handover procedure between a base station and a handover procedure between base stations.
  • the embodiment of the invention further provides 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.
  • an embodiment of the present invention provides an apparatus for transmitting data in a handover procedure, which is installed in a terminal, and includes:
  • the receiving module is configured to receive the radio resource control signaling sent by the source primary base station, where the radio resource control signaling carries the first resource configuration information corresponding to the target primary base station to be accessed by the terminal, and is connected to the terminal Second resource configuration information corresponding to the entered secondary base station;
  • a transmission module configured to: when the terminal leaves the serving cell covered by the source primary base station, maintain a wireless connection with the serving cell of the secondary base station according to the second resource configuration information, and reserve the shared bearer corresponding to the secondary base station The protocol layer is unchanged;
  • the access module is configured to initiate random access to the target primary base station according to the first resource configuration information when the terminal leaves the serving cell covered by the source primary base station.
  • the transmission module is further configured to:
  • the access module is set to:
  • the serving cell of the target primary base station initiates random access.
  • the transmission module is configured to perform transmission of user plane data of the shared bearer with the secondary base station by:
  • a device for transmitting data in a handover procedure is provided at a source primary base station, as shown in FIG. 9, and includes:
  • a communication module configured to receive a handover request acknowledgement message sent by the target primary base station, where the handover request acknowledges carrying the first resource configuration information of the target primary base station and the secondary base station connected to both the source primary base station and the target primary base station Second resource configuration information;
  • a storage module configured to store the handover request acknowledgement message.
  • the communication module is further configured to send a data packet to the target primary base station, the data packet including a PDCP SDU of the service data unit SDU buffer of the unsuccessfully transmitted data packet aggregation protocol PDCP and a subsequently received PDCP SDU.
  • the PDCP SDU that is not successfully transmitted includes a PDCP SDU that is not received by the PDCP sublayer of the source primary base station or that is successfully transmitted by the secondary base station; the buffered PDCP SDU includes a PDCP located at the source primary base station.
  • the sub-layer buffer is not transmitted to the terminal or the PDCP SDU of the RLC sub-layer of the secondary base station; the subsequently received PDCP SDU includes the terminal receiving the serving cell covered by the source primary base station and receiving from the serving gateway To the PDCP SDU.
  • An embodiment of the present invention provides an apparatus for transmitting data in a handover procedure, which is disposed on a target primary base station, as shown in FIG. 10, and includes:
  • An allocation module configured to allocate resources according to a judgment result obtained in a preparation phase of the terminal switching procedure
  • a sending unit configured to send a handover request acknowledgement message to the source primary base station, where the handover request acknowledgement carries the first resource configuration information corresponding to the target primary base station and the second resource corresponding to the secondary base station that the terminal has accessed Configuration information.
  • the device further includes: a first communication module, configured to receive a data packet sent by the source primary base station, where the data packet includes a service data unit SDU of the unsuccessfully transmitted data packet aggregation protocol PDCP, a buffered PDCP SDU, and a subsequent Received PDCP SDU.
  • a first communication module configured to receive a data packet sent by the source primary base station, where the data packet includes a service data unit SDU of the unsuccessfully transmitted data packet aggregation protocol PDCP, a buffered PDCP SDU, and a subsequent Received PDCP SDU.
  • the unsuccessfully transmitted PDCP SDU includes the PDCP sublayer located at the source primary base station not receiving the terminal or the secondary base station a PDCP SDU indicating successful transmission; the buffered PDCP SDU includes a PDCP SDU that is not transmitted to the RLC sublayer of the terminal or the secondary base station in a PDCP sublayer buffer located at the source primary base station; the subsequent reception The received PDCP SDU includes a PDCP SDU received from the serving gateway after the terminal leaves the serving cell covered by the source primary base station.
  • the first communication module is further configured to receive a PDCP SDU corresponding to the shared bearer sent by the source primary base station, and send the received PDCP SDU corresponding to the shared bearer to the PDCP of the shared bearer located in the target primary base station. After the sub-layer processing, it is forwarded to the secondary base station.
  • An embodiment of the present invention provides an apparatus for transmitting data in a handover procedure, which is configured in a secondary base station, as shown in FIG.
  • the processing module is configured to maintain a wireless connection with the terminal according to the second resource configuration information, and keep the protocol layer of the secondary bearer unchanged.
  • the apparatus further includes a release module configured to delete the protocol layer carried by the secondary base station.
  • the release module is configured to:
  • the base station shares the resources of the bearer.
  • the device further includes: a second communication module, configured to receive a PDCP PDU sent by the target primary base station, and send the PDCP PDU to the terminal by using a wireless connection with the terminal.
  • a second communication module configured to receive a PDCP PDU sent by the target primary base station, and send the PDCP PDU to the terminal by using a wireless connection with the terminal.
  • Embodiments of the present invention provide a system for transmitting data in a handover procedure, including the foregoing terminal, a source primary base station, a target primary base station, and a secondary base station.
  • the invention will now be further described in conjunction with various embodiments.
  • the specific embodiment is exemplified by downlink data transmission, and for uplink data transmission (if there is an uplink bearer transmitted via the secondary base station) Lose) is similar to the downlink data.
  • the UE keeps the connection with the secondary base station and the resource configuration according to the signaling indication; after receiving the data packet submitted by the target primary base station, the secondary base station performs user plane data transmission to the UE. Scheduling.
  • the specific process is shown in Figure 12.
  • the serving gateway sends the data packet of the MCG bearer (MCG bearer) to the first base station, and the first base station continues to send the data packet carried by the MCG to the user equipment;
  • the serving gateway sends the data packet of the split bearer (Split bearer) to the first base station.
  • the first base station sends a part of the data packet carried by the split to the user equipment, and sends a part of the data packet carried by the split to the second base station, and the second base station sends the data packet carried by the split to the user equipment;
  • the user equipment, the first base station, the second base station, and the target base station enter a handover preparation phase
  • Step 1 According to the acknowledgement message fed back by the target primary base station in the preparation phase of the inter-base station handover procedure, the first base station (source primary base station) transmits a radio resource control connection reconfiguration (RRC Connection Reconfiguration) message to the UE during the execution phase of the handover procedure. 1.
  • RRC Connection Reconfiguration radio resource control connection reconfiguration
  • the message 1 In addition to carrying the new resource configuration of the UE on the target primary base station side (similar to the definition of the relevant standard), the message 1 also needs to carry the connection between the UE and the secondary base station (ie, the second base station in the figure) and the resource configuration.
  • Related cells optionally, the cells are not included in the mobilityControlInfo.
  • the first base station may stop transmitting the data packet related to the Split bearer to the secondary base station.
  • the UE leaves the first base station cell, synchronizes with the target cell, and initiates random access to the target cell according to the indication of the message 1.
  • the protocol entity/protocol layer needs to be performed according to the new resource configuration.
  • the reconstruction/reset includes two parts, and the MCG bearer and the split bearer are located in the protocol stack of the first base station.
  • the UE maintains a connection with the secondary base station cell and corresponds to the configuration of each protocol entity/protocol layer of the secondary bearer corresponding to the split bearer.
  • Step 2 According to the indication sent by the target primary base station in the handover preparation phase, the first base station forwards the data packet of the bearer that needs to perform data packet forwarding to the target primary base station, and simultaneously sends the data packet number status information of the bearer.
  • the data forwarding needs to be performed on all the data bearers, and the forwarded data packet includes: when the first base station sends the message 1 to the UE, the first base station is located.
  • the PDCP entity of each data bearer of the first base station has not received the corresponding RLC entity (which may include the RLC entity located in the secondary base station for the Split bearer) indicating that the PDCP SDU has been successfully transmitted, and the first base station PDCP physical buffer area There are no transmitted SDUs, and subsequent PDCP SDUs newly received from the S-GW.
  • the corresponding RLC entity which may include the RLC entity located in the secondary base station for the Split bearer
  • the target primary base station After receiving the data packet forwarded by the first base station, the target primary base station performs PDCP processing and encapsulation on the data packet of the split bearer, and delivers the data packet to the secondary base station for transmission. If the secondary base station receives the first PDCP PDU from the target primary base station, if there are still data packets in the RLC entity buffer corresponding to the Split bearer, the secondary base station discards the data packets and does not send them. That is, the secondary base station will transmit the data packet from the target primary base station as soon as possible.
  • the UE After successfully accessing the target cell and the protocol entity/protocol layer successfully enables the new radio resource configuration, the UE sends a message 4 (RRC Connection Reconfiguration Complete) to the target primary base station. After receiving the message 4, the target primary base station can perform transmission scheduling of the user plane directly to the UE. In this way, the transmission of the Split bearer includes that the target primary base station transmits via the Uu interface between itself and the UE, and the target primary base station delivers part of the PDCP PDU to the secondary base station for transmission.
  • a message 4 RRC Connection Reconfiguration Complete
  • Step 3 In the path conversion procedure of the handover completion phase, the downlink data tunnel endpoints of all data bearers are switched from the first base station to the target primary base station.
  • the first base station instructs the secondary base station to release the X2 connection between the two nodes related to the UE by using the message 7, the message 7 can be
  • the X2 control plane message (such as the secondary base station release request message, SENB RELEASE REQUEST) defined in the relevant standard may also be a new message.
  • the release procedure does not affect the user plane data scheduling and resource configuration related to the UE by the secondary base station, and does not affect the context related to the UE saved on the secondary base station.
  • the UE keeps the connection with the secondary base station and the resource configuration unchanged according to the signaling indication; after indicating the handover to the UE, the first base station submits the data packet processed by the new configuration to the secondary base station for further transmission.
  • the specific process is shown in Figure 13.
  • the serving gateway sends the data packet of the MCG bearer (MCG bearer) to the first base station, and the first base station continues to send the data packet carried by the MCG to the user equipment; the serving gateway sends the data packet of the split bearer (Split bearer) to the first base station.
  • MCG bearer MCG bearer
  • split bearer split bearer
  • Step 1 The first base station decides to initiate an intra-base station handover procedure, and at the same time determines the connection and resource configuration between the UE and the secondary base station.
  • the first base station sends an RRC Connection Reconfiguration message 1 to the UE, where the message 1 carries the new resource configuration (similar to the definition of the relevant standard) of the UE, and carries the connection and resources between the UE and the secondary base station.
  • Configured related cells optionally, the cells are not included in the mobilityControlInfo.
  • the UE leaves the first base station cell and synchronizes with the target cell and initiates random access to the target cell according to the indication of the message 1. From the perspective of the protocol stack, each UE needs to be configured according to the new resource.
  • the protocol entity/protocol layer performs reconstruction/reset including two parts, and the MCG bearer and the split bearer are located in the protocol stack of the first base station.
  • the UE maintains a connection with the secondary base station cell and corresponds to the configuration of each protocol entity/protocol layer of the secondary bearer corresponding to the split bearer.
  • Step 2 After the message 1 is sent to the UE, the PDCP PDU that the first base station submits to the secondary base station should be a PDU that is encapsulated and processed by the newly configured (ie, reconstructed) PDCP entity.
  • the PDU may include: when the first base station sends the message 1 to the UE, the PDCP entity whose Split bearer is located at the first base station has not received the corresponding RLC entity (which may include the RLC entity located at the secondary base station) indicating that the message has been successfully transmitted.
  • the secondary base station If the secondary base station receives the first PDCP PDU processed by the new configuration from the first base station, if the data packet is not sent in the RLC entity buffer corresponding to the Split bearer, the secondary base station will send the data. The packet is discarded and no longer transmitted, ie the secondary base station will transmit the data packet from the target primary base station as soon as possible.
  • the discarding behavior can be triggered in two ways: 1) the first base station sends a control plane message 2 to the secondary base station, and the example shows the name of the “master base station handover indication”, which can be defined by the relevant standard.
  • the SENB MODIFICATION REQUEST message or other X2 message may also be a new message; 2)
  • the first PDCP PDU processed in the new configuration carries an indicator indicating that it is the first A newly configured packet.
  • Step 3 After successfully accessing the target cell and the protocol entity/protocol layer successfully enables the new radio resource configuration, the UE sends a message 4 (RRC Connection Reconfiguration Complete) to the target primary base station. After receiving the message 4, the first base station can resume the user plane transmission scheduling for the UE.
  • a message 4 RRC Connection Reconfiguration Complete
  • the UE is configured with three data bearers as an example.
  • the EPS bearer 1 and the EPS bearer 2 belong to the MCG bearer and the EPS bearer 3 belongs to the split bearer.
  • the target primary base station decides to request the secondary base station to add some resources to provide services for the EPS bearer 2, that is, the EPS bearer 2 is converted into a split bearer, while keeping the EPS bearer 3 in the protocol stack resource configuration of the secondary base station unchanged.
  • the specific process is shown in Figure 14.
  • Step 1 The first base station sends an RRC Connection Reconfiguration message 1 to the UE, and the UE leaves the first base station cell, synchronizes with the target cell, and initiates random access to the target cell according to the indication of the message 1, while maintaining and The connection between base station cells.
  • the UE allocates new resources according to the target primary base station to each protocol entity/protocol layer corresponding to the EPS bearer1 and each protocol entity/protocol layer corresponding to the protocol stack of the EPS bearer3 on the target primary base station side.
  • the resource configuration is reconstructed/reset, and the configuration of each protocol entity/protocol layer corresponding to the protocol stack of the EPS bearer3 located on the secondary base station side remains unchanged.
  • the UE may first release the corresponding resource, and then reconstruct the protocol stack corresponding to the target primary base station according to the new resource resource configuration allocated by the target primary base station, and reconstruct the corresponding new resource resource configuration according to the secondary base station.
  • the protocol stack of the base station is the protocol stack of the base station.
  • Step 2 After receiving the acknowledgement message replied by the target primary base station in the handover preparation phase, the first base station may send a message 2 to the secondary base station to instruct the secondary base station to release the X2 connection related to the UE between the two nodes.
  • Message 2 may be by means of an X2 control plane message (such as a secondary base station release request message, SENB RELEASE REQUEST) as defined in the relevant standard, or may be a new message.
  • the secondary base station caches the RLC entity corresponding to the EPS bearer 3. In the area, the data packet from the first base station is not sent, and the secondary base station discards all the data packets.
  • the first base station forwards the data packet of the bearer that needs to perform data packet forwarding to the target primary base station, and simultaneously transmits the data packet number status information of the bearer.
  • the data forwarding needs to be performed on all the data bearers.
  • the forwarded data packet includes: when the first base station sends the message 1 to the UE, the PDCP entity of each data bearer located in the first base station has not received yet.
  • the corresponding RLC entity (which may include the RLC entity located in the secondary base station for the EPS bearer 3) indicating the PDCP SDU that has been successfully transmitted, the SDU that has not been transmitted in the first base station PDCP physical buffer, and the subsequent new from the S-GW Received PDCP SDU.
  • the target primary base station After receiving the data packet forwarded by the first base station, the target primary base station processes and encapsulates the data packets of the EPS bearer2 and the EPS bearer3 through the PDCP entity, and delivers the data packet to the secondary base station for transmission. If the secondary base station receives the first PDCP PDU from the target primary base station, if there are still data packets in the RLC entity buffer corresponding to the Split bearer, the secondary base station discards the data packets and does not send them. That is, the secondary base station will transmit the data packet from the target primary base station as soon as possible.
  • the UE After successfully accessing the target cell and the protocol entity/protocol layer successfully enables the new radio resource configuration, the UE sends a message 5 (RRC Connection Reconfiguration Complete) to the target primary base station. After receiving the message 5, the target primary base station can perform transmission scheduling of the user plane directly to the UE. In this way, the transmission of the Split bearer includes that the target primary base station transmits via the Uu interface between itself and the UE, and the target primary base station delivers part of the PDCP PDU to the secondary base station for transmission.
  • a message 5 RRC Connection Reconfiguration Complete
  • Step 3 In the path conversion procedure of the handover completion phase, the downlink data tunnel endpoints of all data bearers are switched from the first base station to the target primary base station.
  • the target primary base station Upon receiving the acknowledgment message of the core network regarding the successful path conversion, the target primary base station instructs the first base station to release the context associated with the UE.
  • the Split bearer transmitted by the secondary base station before the handover procedure may also be determined by the target primary base station to switch to the target primary base station in the handover procedure to continue transmission (ie, converted to MCG bearer), but still transmitted by the secondary base station.
  • the resource configuration of the bearer part is unchanged, and the connection between the UE and the secondary base station is maintained during the handover process.
  • the secondary base station may continue to perform user plane data transmission scheduling corresponding to the reserved Split bearer in the handover process.
  • each module/unit in the above embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, executing a program stored in the memory by a processor. / instruction to achieve its corresponding function.
  • the invention is not limited to any specific form of combination of hardware and software.
  • the foregoing technical solution can improve data transmission performance between the user equipment and the secondary base station when the primary serving base station of the user equipment performs handover, and is applicable to various types of base stations, in the process of transmitting data and/or moving in the DC state UE, when When the primary serving base station accessed by the UE is switched, the user plane between the UE and the connected secondary base station can 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 resource. And save control plane signaling.

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Abstract

一种在切换程序中传输数据的方法、装置和系统，涉及移动通信技术领域。包括：接收源主基站发送的无线资源控制信令，所述无线资源控制信令携带与所述终端待接入的目标主基站对应的第一资源配置信息和与所述终端已接入的次基站对应的第二资源配置信息；当所述终端离开所述源主基站覆盖的服务小区时，按照所述第二资源配置信息保持与所述次基站的服务小区的无线连接，保留分担承载对应于次基站的协议层不变，并按照所述第一资源配置信息向所述目标主基站发起随机接入。上述技术方案在用户设备的主服务基站进行切换时，UE与连接的次基站间的用户面不会中断，能够提升用户设备与次基站间的数据传输性能。

Description

一种在切换程序中传输数据的方法、装置和系统 技术领域
本文涉及但不限于移动通信技术领域，尤其涉及一种在切换程序中传输数据的方法、装置和系统。
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(由低功率基站建立的小区，区别于宏基站建立的小区Macro Cell，小小区通常称为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异构网络部署场景是，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(Radio Access Network，简称RAN)，从而为用户设备(User Equipment，简称UE)提供联合的数据传输服务。
这种典型场景下的系统架构可参考图1，在RAN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，所述接口上可传输控制面信令和用户面数据，这种状态也称UE处于双连接态(Dual Connectivity，简称DC)。如图1所示的系统架构使得两个(甚至多个)基站可以同时为一个UE提供无线资源进行通讯服务，网络的数据吞吐量得到了极大的提升，可以尽力满足用户日益增长的对数据速率的需求。
图1所示的系统架构下用户面传输模式及协议栈可以参见图2。以下行数据为例，演进分组系统(Evolved Packet System，简称EPS)承载#1(bearer#1) 的传输模式与单链接系统的标准模式相同，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；在DC中，这种EPS承载#1仅位于MeNB且仅使用MeNB资源的承载，称为MCG bearer。EPS承载#2(bearer#2)表示搭建于S-GW与UE间的一条数据流，该数据流的传输需经过接入网中的基站，EPS bearer#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，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；这种EPS承载#2位于MeNB和SeNB、需使用MeNB和SeNB的资源去进行传输的承载，称为Split bearer。
从协议栈的角度，在网络侧，Split bearer配置一个位于MeNB的数据包汇聚协议(Packet Data Convergence Protocol，简称PDCP)实体，以及两套独立的、分别配置在MeNB和SeNB的无线链路控制(Radio Link Control，简称RLC)实体、媒体接入控制(Medium Access Control，简称MAC)实体和物理层(Physical layer，简称PHY)。以Split bearer的下行数据发送为例，位于MeNB的PDCP实体将部分PDCP协议数据单元(Protocol Data Unit，简称PDU)通过X2接口递交给位于SeNB的RLC实体去进一步发送、另一部分PDCP PDU则由MeNB自身的RLC实体(及以下每个协议层)进行发送。在Split bearer的下行数据接收端，即UE侧(其协议实体可以与网络侧一一对应、于UE内部实现)，两个分别对应于MeNB和SeNB的RLC实体(及以下每个协议层)将各自接收到的RLC PDU进行解封装等一系列处理后、递交给统一的PDCP实体去执行进一步的传输操作。
在UE进行数据传输和/或移动的过程中会存在两种场景：一是例如当某协议实体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；二是例如当无线信号质量下降到一定门限或当前服务基站的负荷过重时，所述UE的服务基站需要从当前连接的eNB(称为源基站、或源主基站，source eNB)切换至另一个条件合适的eNB(称为目标基站，target eNB)。这两种场景需要通过基站内切换(intra-eNB handover，切换前后UE仍与同一eNB建立连接，仅部分参数进行了重配)或基站间切换(inter-eNB handover， 切换前后UE与不同eNB建立连接)的程序来实现。
在图1所示的系统架构下，当处于DC态的UE的MeNB需要进行切换时，依据相关技术，UE的SeNB会在切换程序前或切换程序过程中被释放掉。如果在所述UE接入target eNB后(对于intra-eNB handover，target eNB就是原MeNB)仍存在业务需求及条件适合的基站节点，那么target eNB会为所述UE再添加SeNB。可选的，对于intra-eNB handover来讲，如果原SeNB的条件一直满足设定门限，那么MeNB可以在一条控制面信令中同时携带MeNB的(intra-)handover信息和所述SeNB的释放与再添加信息，即仅通过一条空口控制面信令来指示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切换而中断。即使在Intra-MeNB handover程序中，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也会随之加长。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因故受限，进而网络的整体服务性能也下降。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
本发明实施例提供一种在切换程序中传输数据的方法、装置和系统，以实现在切换程序中保持用户面部分数据传输。
本发明实施例提供了一种在切换程序中传输数据的方法，应用于终端，包括：
接收源主基站发送的无线资源控制信令，所述无线资源控制信令携带与所述终端待接入的目标主基站对应的第一资源配置信息和与所述终端已接入的次基站对应的第二资源配置信息；
当所述终端离开所述源主基站覆盖的服务小区时，按照所述第二资源配置信息保持与所述次基站的服务小区的无线连接，保留分担承载对应于次基 站的协议层不变，并按照所述第一资源配置信息向所述目标主基站发起随机接入。
可选地，保留分担承载对应于次基站的协议层的部分不变之后还包括：
与所述次基站进行所述分担承载的用户面数据的传输。
可选地，按照所述第一资源配置信息向所述目标主基站发起随机接入包括：
按照所述第一资源配置信息将主小区组MCG承载的协议层和分担承载对应于所述目标主基站的协议层进行重建或者复位，并与所述目标主基站的服务小区进行同步，向所述目标主基站的服务小区发起随机接入。
可选地，与所述次基站进行所述分担承载的用户面数据的传输包括：
接收所述次基站的调度信息；
根据所述调度信息与所述次基站进行所述分担承载上的用户面数据的传输。
本发明实施例还提供了一种在切换程序中传输数据的方法，应用于目标主基站，包括：
根据在终端切换程序的准备阶段中得出的判断结果进行资源分配，并向源主基站发送切换请求确认消息，所述切换请求确认携带与所述目标主基站对应的第一资源配置信息和与所述终端已接入的次基站对应的第二资源配置信息。
可选地，所述方法还包括：接收源主基站发送未成功传输的数据包汇聚协议PDCP的服务数据单元SDU、缓存的PDCP SDU以及后续接收到的PDCP SDU，所述未成功传输的PDCP SDU包括位于源主基站的PDCP子层未收到所述终端或者所述次基站指示成功传输的PDCP SDU，所述缓存的PDCP SDU包括位于所述源主基站的PDCP子层缓存区未传输至所述终端或者所述次基站的RLC子层的PDCP SDU，所述后续接收到的PDCP SDU包括所述终端离开所述源主基站覆盖的服务小区后从服务网关接收到的PDCP SDU。
可选地，所述方法还包括：接收源主基站发送的与分担承载对应的PDCP SDU，将接收到的与所述分担承载对应的PDCP SDU经位于所述目标主基站 的所述分担承载的PDCP子层处理后，转发至所述次基站。
本发明实施例还提供了一种在切换程序中传输数据的方法，应用于次基站，包括：
按照终端已接入的次基站对应的第二资源配置信息保持与所述终端的无线连接，保留分担承载在次基站的协议层不变。
可选地，所述方法还包括：接受目标主基站的通知，删除所述分担承载在次基站的协议层。
可选地，删除所述分担承载在次基站的协议层包括：
清空所述源主基站发送的缓存在RLC子层中的数据包汇聚协议PDCP的协议数据单元PDU和/或释放所述分担承载对应的资源；所述分担承载对应的资源指不再保留在次基站的分担承载的资源。
可选地，所述方法还包括：接收目标主基站发送的PDCP PDU，通过与所述终端的无线连接，将所述PDCP PDU发送至所述终端。
本发明实施例还提供了一种在切换程序中传输数据的装置，设置于终端，包括：
接收模块，设置为接收源主基站发送的无线资源控制信令，所述无线资源控制信令携带与所述终端待接入的目标主基站对应的第一资源配置信息和与所述终端已接入的次基站对应的第二资源配置信息；
传输模块，设置为当所述终端离开所述源主基站覆盖的服务小区时，按照所述第二资源配置信息保持与所述次基站的服务小区的无线连接，保留分担承载对应于次基站的协议层不变；
接入模块，设置为当所述终端离开所述源主基站覆盖的服务小区时，按照所述第一资源配置信息向所述目标主基站发起随机接入。
可选地，所述传输模块还设置为：
与所述次基站进行所述分担承载的用户面数据的传输。
可选地，接入模块是设置为：
按照所述第一资源配置信息将主小区组MCG承载的协议层和分担承载 对应于所述目标主基站的协议层进行重建或者复位，并与所述目标主基站的服务小区进行同步，向所述目标主基站的服务小区发起随机接入。
可选地，所述传输模块是设置为通过如下方式实现与所述次基站进行所述分担承载的用户面数据的传输：
接收所述次基站的调度信息；
根据所述调度信息与所述次基站进行所述分担承载上的用户面数据的传输。
本发明实施例还提供了一种在切换程序中传输数据的装置，设置于目标主基站，包括：
分配模块，设置为根据在终端切换程序的准备阶段中得出的判断结果进行资源分配，
发送单元，设置为向源主基站发送切换请求确认消息，所述切换请求确认携带与所述目标主基站对应的第一资源配置信息和与所述终端已接入的次基站对应的第二资源配置信息。
可选地，所述装置还包括：第一通信模块，设置为接收源主基站发送未成功传输的数据包汇聚协议PDCP的服务数据单元SDU、缓存的PDCP SDU以及后续接收到的PDCP SDU，所述未成功传输的PDCP SDU包括位于源主基站的PDCP子层未收到所述终端或者所述次基站指示成功传输的PDCP SDU，所述缓存的PDCP SDU包括与位于所述源主基站的PDCP子层缓存区未传输至所述终端或者所述次基站的RLC子层的PDCP SDU，所述后续接收到的PDCP SDU包括所述终端离开所述源主基站覆盖的服务小区后从服务网关接收到的PDCP SDU。
可选地，所述第一通信模块，还设置为接收源主基站发送的与分担承载对应的PDCP SDU，将接收到的与所述分担承载对应的PDCP SDU经位于所述目标主基站的所述分担承载的PDCP子层处理后，转发至所述次基站。
本发明实施例还提供了一种在切换程序中传输数据的装置，设置于次基站，包括：
处理模块，设置为按照终端已接入的次基站对应的第二资源配置信息保 持与所述终端的无线连接，保留分担承载在次基站的协议层不变。
可选地，所述装置还包括释放模块，设置为接受目标主基站的通知，删除所述分担承载在次基站的协议层。
可选地，所述释放模块是设置为：
清空所述源主基站发送的缓存在RLC子层中的数据包汇聚协议PDCP的协议数据单元PDU和/或释放所述分担承载对应的资源；所述分担承载对应的资源指不再保留在次基站的分担承载的资源。
可选地，所述装置还包括：第二通信模块，设置为接收目标主基站发送的PDCP PDU，通过与所述终端的无线连接，将所述PDCP PDU发送至所述终端。
本发明实施例还提供了一种在切换程序中传输数据的系统，包括：上述的终端、源主基站、目标主基站和次基站，
所述源主基站包括：
通信模块，设置为接收目标主基站发送的切换请求确认消息，并向所述终端发送无线资源控制信令。
本发明实施例还提供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的方法。
与相关技术相比，本发明实施例在用户设备的主服务基站进行切换时，能够提升用户设备与次基站间的数据传输性能，适用于各种类型的基站，在DC态UE传输数据和/或移动的过程中，当UE接入的主服务基站发生切换时，UE与连接的次基站间的用户面不会中断、即可继续传输数据。提升了用户设备传输数据的性能及吞吐量、提高了无线资源的使用效率，并节省了控制面信令。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
图1为本发明实施例的适用的异构网络系统架构示意图；
图2是本发明实施例的适用的用户面传输及协议栈示意图；
图3是本发明实施例的适用的基站间切换场景示例图；
图4是本发明实施例的应用于终端的在切换程序中传输数据的方法的流程图；
图5是本发明实施例的应用于源主基站的在切换程序中传输数据的方法流程图；
图6是本发明实施例应用于目标主基站的在切换程序中传输数据的方法流程图；
图7是本发明实施例应用于次基站的在切换程序中传输数据的方法流程图；
图8为本发明实施例的设置于终端的在切换程序中传输数据的装置的结构示意图；
图9为本发明实施例的设置于源主基站的在切换程序中传输数据的装置的结构示意图；
图10为本发明实施例的设置于目标主基站的在切换程序中传输数据的装置的结构示意图；
图11为本发明实施例的设置于次基站的在切换程序中传输数据的装置的结构示意图；
图12为本发明实施例一的流程示意图；
图13是本发明实施例二的流程示意图；
图14是本发明实施例三的消息示意图。
本发明的实施方式
下文中将结合附图对本发明实施例进行详细说明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互任意组合。
在3GPP系统中，包括UE、接入网、核心网，其中，UE同时与接入网 中的源主基站和次基站建有无线连接；源主基站、次基站可以是各种类型的基站，两者间建有接口(如X2口)。UE与源主基站间可传输控制面信令和用户面数据，UE与次基站间至少可传输用户面数据。
所述系统架构、用户面传输模型以及协议栈形式可参考图1、图2的示例及相关阐述，其中，源主基站可相当于MeNB，次基站可相当于SeNB。本发明实施例所述方案并不局限于SeNB的数目，即若UE同时接入多个基站，那么本方案同样适用。
本发明实施例应用的场景是：
参考图3的示例，UE在移动的过程中，与第一基站(称为源主基站)的服务小区(称为源小区)间信号质量下降、与第三基站(称为目标主基站)的服务小区(称为目标小区)间信号质量上升；同时，UE始终处于次基站的覆盖范围内，即UE与次基站小区间的信号质量保持良好。
源主基站在请求目标主基站的同意后，指示UE离开源小区、接入目标小区，目标主基站与次基站间建有X2接口、并负责与核心网的节点间为所述UE传输控制面信令和用户面数据。所述切换程序使得目标主基站成为UE新的主服务基站。
如图4所示，本发明实施例提供一种在切换程序中传输数据的方法，应用于终端，包括：
接收源主基站发送的无线资源控制信令，所述无线资源控制信令携带与所述终端待接入的目标主基站对应的第一资源配置信息和与所述终端已接入的次基站对应的第二资源配置信息；
可选的，所述第一资源配置信息、第二资源配置信息包括建立或修改或释放无线承载的指示信息，以及修正MAC与PHY配置的指示信息。
当所述终端离开所述源主基站覆盖的服务小区时，按照所述第二资源配置信息保持与所述次基站的服务小区的无线连接，保留分担承载对应于次基站的协议层不变，并按照所述第一资源配置信息向所述目标主基站发起随机接入。
可选地，保留分担承载对应于次基站的协议层的部分不变之后还包括：
与所述次基站进行所述分担承载的用户面数据的传输。
可选地，按照所述第一资源配置信息向所述目标主基站发起随机接入包括：
按照所述第一资源配置信息将主小区组MCG承载的协议层和分担承载对应于所述目标主基站的协议层进行重建或者复位，并与所述目标主基站的服务小区进行同步，向所述目标主基站的服务小区发起随机接入。
可选地，与所述次基站进行所述分担承载的用户面数据的传输包括：
接收所述次基站的调度信息；
根据所述调度信息与所述次基站进行所述分担承载上的用户面数据的传输。
本发明实施例还提供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的方法。
如图5所示，本发明实施例提供一种在切换程序中传输数据的方法，应用于源主基站，包括：
接收目标主基站发送的切换请求确认消息，所述切换请求确认携带与所述目标主基站连接的第一资源配置信息和与所述源主基站和目标主基站均连接的次基站的第二资源配置信息。
可选的，所述第一资源配置信息、第二资源配置信息包括建立或修改或释放无线承载的指示信息，以及修正MAC与PHY配置的指示信息。
可选的，所述源主基站还向目标主基站发送数据包，所述数据包包括：未成功传输的数据包汇聚协议PDCP的服务数据单元SDU(Service Data Unit)、缓存的PDCP SDU以及后续接收到的PDCP SDU；
所述未成功传输的PDCP SDU包括位于源主基站的PDCP子层未收到所述终端或者所述次基站指示成功传输的PDCP SDU；所述缓存的PDCP SDU包括位于所述源主基站的PDCP子层缓存区未传输至所述终端或者所述次基站的RLC子层的PDCP SDU；所述后续接收到的PDCP SDU包括所述终端离开所述源主基站覆盖的服务小区后从服务网关接收到的PDCP SDU。
具体地，上述源主基站对目标主基站转发的数据包包括：源主基站在向UE发送RRC信令时，位于源主基站的每个数据承载的PDCP实体还没有收到对应的RLC实体(可以包括位于次基站的RLC实体)指示已成功传输的PDCP SDU、源主基站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。转发行为结束于源主基站已经将所述UE的所有需要转发的数据包转发完毕时。
本发明实施例还提供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的方法。
如图6所示，本发明实施例提供一种在切换程序中传输数据的方法，应用于目标主基站，包括：
根据在终端切换程序的准备阶段中得出的判断结果进行资源分配，并向源主基站发送切换请求确认消息，所述切换请求确认携带与所述目标主基站对应的第一资源配置信息和与所述终端已接入的次基站对应的第二资源配置信息。
可选的，所述第一资源配置信息、第二资源配置信息包括建立或修改或释放无线承载的指示信息，以及修正MAC与PHY配置的指示信息。
可选地，所述目标主基站还接收源主基站发送的数据包，所述数据包包括未成功传输的数据包汇聚协议PDCP的服务数据单元SDU、缓存的PDCP SDU以及后续接收到的PDCP SDU。
所述未成功传输的PDCP SDU包括位于源主基站的PDCP子层未收到所述终端或者所述次基站指示成功传输的PDCP SDU；所述缓存的PDCP SDU包括位于所述源主基站的PDCP子层缓存区未传输至所述终端或者所述次基站的RLC子层的PDCP SDU；所述后续接收到的PDCP SDU包括所述终端离开所述源主基站覆盖的服务小区后从服务网关接收到的PDCP SDU。
可选地，所述方法还包括：目标主基站接收源主基站发送的与分担承载对应的PDCP SDU；所述目标主基站将接收到的与分担承载对应的PDCP SDU经位于所述目标主基站的所述分担承载的PDCP子层处理后，转发至所 述次基站。
所述目标主基站在终端切换程序的准备阶段中判断是否允许UE的接入，是否有承载要删除，是否有承载类型的改变(例如MCG bearer<—>split bearer)。
可选地，在所述终端随机接入成功后，目标主基站为所述终端传输控制面信令和用户面数据。
目标主基站根据在切换程序的准备阶段中得出的判断结果进行资源分配，并向源主基站回复切换请求确认消息，所述切换请求确认消息中至少携带所述UE在目标主基站和次基站的资源配置信息，可选的，对于所述UE在次基站的资源配置，所述目标主基站可简单的指示连接与资源配置不变。源主基站根据接收到的消息组成面向UE的无线资源控制(Radio Resource Control，简称RRC)信令并发送给UE。
UE按照所述RRC信令中携带的信息，一方面离开源主基站的服务小区、按照新的配置对与MCG bearer和Split bearer在源主基站的协议栈对应的协议实体进行重建/复位，并与目标小区进行同步、向目标小区发起随机接入；另一方面，UE保持与次基站小区间的无线连接及与仍然保留在次基站的Split bearer在次基站的协议栈对应的协议实体不变，可选的，可按照次基站的调度继续与仍然保留在次基站的Split bearer相关的用户面数据的传输。
本发明实施例还提供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的方法。
如图7所示，本发明实施例提供一种在切换程序中传输数据的方法，应用于次基站，包括：
按照第二资源配置信息保持与所述终端的无线连接，保留分担承载在次基站的协议层不变。
可选地，所述次基站还删除所述分担承载在次基站的协议层。
其中，删除所述分担承载在次基站的协议层包括：
清空所述源主基站发送的缓存在RLC子层中的数据包汇聚协议PDCP的 协议数据单元PDU和/或释放所述分担承载对应的资源；所述分担承载对应的资源指不再保留在次基站的分担承载的资源。
此步骤由控制面进行制定，是由目标主基站决定的，次基站接受目标主基站的通知执行。
可选地，所述次基站接收目标主基站发送的PDCP PDU，通过与所述终端的无线连接，将所述PDCP PDU发送至所述终端。
其中，SDU是一个协议子层刚收到、尚未进行该协议层封装的数据包，PDU是协议子层已封装、即将发送给下一协议子层的数据包。
如对PDCP(主要负责加密)来讲，源主基站将PDCP SDU发送给目标主基站，目标主基站将加密等处理后的PDCP PDU交给次基站(RLC子层)去进一步传输。
源主基站与次基站间释放与所述UE相关的X2接口可以有源主基站触发或次基站触发两种方式。所述释放程序完成后，对仍然保留在次基站的Split bearer，如果与所述承载对应的RLC实体缓存区内仍有来自于源主基站递交来的PDCP PDU，次基站将所述PDU清空，但资源配置不变；对于不再保留在次基站的Split bearer，次基站将与所述承载对应的资源释放。
对于仍然保留在次基站传输的Split bearer，目标主基站将接收到的转发数据包进行PDCP的处理封装，并递交给次基站去进行传输。如果次基站在接收到来自目标主基站的首个PDCP PDU时，与所述Split bearer对应的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，即次基站会尽可能快的发送来自于目标主基站的数据包。
这里表达的是三种情况：
1.分担承载仍保留在原次基站，那么次基站在适当的时机(最晚在收到目标主基站发送的数据包时)清空缓存的数据包，但对应的资源并不释放，即会继续工作；
2.分担承载在主基站切换后不再在原次基站传输(可能只在目标主基站传输或由其他次基站负责)，那么在收到目标主基站的控制面信令后，原次基站就清空数据包并释放资源了；
3.分担承载没有被目标主基站接受、即要被整体释放了，那么在收到目标主基站的控制面信令后，原次基站就清空数据包并释放资源了。
对于情况2和3，次基站对控制面信令的解读和相关操作是相同的。
本发明实施例的方法适用于基站内切换程序与基站间切换程序。
本发明实施例还提供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的方法。
如图8所示，本发明实施例提供一种在切换程序中传输数据的装置，设置于终端，包括：
接收模块，设置为接收源主基站发送的无线资源控制信令，所述无线资源控制信令携带与所述终端待接入的目标主基站对应的第一资源配置信息和与所述终端已接入的次基站对应的第二资源配置信息；
传输模块，设置为当所述终端离开所述源主基站覆盖的服务小区时，按照所述第二资源配置信息保持与所述次基站的服务小区的无线连接，保留分担承载对应于次基站的协议层不变；
接入模块，设置为当所述终端离开所述源主基站覆盖的服务小区时，按照所述第一资源配置信息向所述目标主基站发起随机接入。
可选地，所述传输模块还设置为：
与所述次基站进行所述分担承载的用户面数据的传输。
可选地，接入模块是设置为：
按照所述第一资源配置信息将主小区组MCG承载的协议层和分担承载对应于所述目标主基站的协议层进行重建或者复位，并与所述目标主基站的服务小区进行同步，向所述目标主基站的服务小区发起随机接入。
所述传输模块是设置为通过如下方式实现与所述次基站进行所述分担承载的用户面数据的传输：
接收所述次基站的调度信息；
根据所述调度信息与所述次基站进行所述分担承载上的用户面数据的传 输。
一种在切换程序中传输数据的装置，设置于源主基站，如图9所示，包括：
通信模块，设置为接收目标主基站发送的切换请求确认消息，所述切换请求确认携带所述目标主基站的第一资源配置信息和与所述源主基站和目标主基站均连接的次基站的第二资源配置信息；
存储模块，设置为存储所述切换请求确认消息。
所述通信模块还设置为向目标主基站发送数据包，所述数据包包括未成功传输的数据包汇聚协议PDCP的服务数据单元SDU缓存的PDCP SDU以及后续接收到的PDCP SDU。所述未成功传输的PDCP SDU包括位于源主基站的PDCP子层未收到所述终端或者所述次基站指示成功传输的PDCP SDU；所述缓存的PDCP SDU包括位于所述源主基站的PDCP子层缓存区未传输至所述终端或者所述次基站的RLC子层的PDCP SDU；所述后续接收到的PDCP SDU包括所述终端离开所述源主基站覆盖的服务小区后从服务网关接收到的PDCP SDU。
本发明实施例提供一种在切换程序中传输数据的装置，设置于目标主基站，如图10所示，包括：
分配模块，设置为根据在终端切换程序的准备阶段中得出的判断结果进行资源分配，
发送单元，设置为向源主基站发送切换请求确认消息，所述切换请求确认携带与所述目标主基站对应的第一资源配置信息和与所述终端已接入的次基站对应的第二资源配置信息。
所述的装置，还包括：第一通信模块，设置为接收源主基站发送的数据包，所述数据包包括未成功传输的数据包汇聚协议PDCP的服务数据单元SDU、缓存的PDCP SDU以及后续接收到的PDCP SDU。所述未成功传输的PDCP SDU包括位于源主基站的PDCP子层未收到所述终端或者所述次基站 指示成功传输的PDCP SDU；所述缓存的PDCP SDU包括与位于所述源主基站的PDCP子层缓存区未传输至所述终端或者所述次基站的RLC子层的PDCP SDU；所述后续接收到的PDCP SDU包括所述终端离开所述源主基站覆盖的服务小区后从服务网关接收到的PDCP SDU。
所述第一通信模块还设置为接收源主基站发送的与分担承载对应的PDCP SDU，将接收到的与所述分担承载对应的PDCP SDU经位于所述目标主基站的所述分担承载的PDCP子层处理后，转发至所述次基站。
本发明实施例提供一种在切换程序中传输数据的装置，设置于次基站，如图11所示，包括：
处理模块，设置为按照第二资源配置信息保持与所述终端的无线连接，保留分担承载在次基站的协议层不变。
所述装置还包括释放模块，设置为删除所述分担承载在次基站的协议层。
所述释放模块是设置为：
清空所述源主基站发送的缓存在RLC子层中的数据包汇聚协议PDCP的协议数据单元PDU和/或释放所述分担承载对应的资源；所述分担承载对应的资源指不再保留在次基站的分担承载的资源。
所述装置还包括：第二通信模块，设置为接收目标主基站发送的PDCP PDU，通过与所述终端的无线连接，将所述PDCP PDU发送至所述终端。
本发明实施例提供一种在切换程序中传输数据的系统，包括上述终端、源主基站、目标主基站和次基站。
下面结合不同的实施例对本发明进行进一步的说明。具体实施例是以下行数据传输来举例的，而对于上行数据的传输(若有上行承载经由次基站传 输)与下行数据类似。
具体实施例一：
系统架构、用户面模式及场景如具体实施方式所述。在基站间切换程序中，UE按照信令指示保持与次基站间的连接及资源配置不变；在收到目标主基站递交来的数据包后，次基站对所述UE进行用户面的数据传输调度。具体流程如图12所示。
服务网关将MCG承载(MCG bearer)的数据包发送至第一基站，第一基站继续将MCG承载的数据包发送至用户设备；服务网关将Split承载(Split bearer)的数据包发送至第一基站，第一基站将Split承载的部分数据包发送至用户设备，还将Split承载的部分数据包发送至第二基站，由第二基站将Split承载的这部分数据包发送至用户设备；
用户设备、第一基站、第二基站和目标基站进入切换准备阶段；
步骤1：根据目标主基站在基站间切换程序的准备阶段中反馈的确认消息，第一基站(源主基站)在切换程序的执行阶段向UE发送无线资源控制连接重配置(RRC Connection Reconfiguration)消息1。所述消息1除携带UE在目标主基站侧的新资源配置(与相关标准定义类似)外，还需携带指示UE保留与次基站(即图中的第二基站)间的连接及资源配置的相关信元，可选的，所述信元不包括在mobilityControlInfo中。在发送所述消息1时，第一基站可停止向次基站发送与Split bearer相关的数据包。
所述UE根据所述消息1的指示，一方面离开第一基站小区、与目标小区进行同步并向所述目标小区发起随机接入；需按照新的资源配置对每个协议实体/协议层进行重建/复位的包括两部分，MCG bearer和Split bearer位于第一基站的协议栈。另一方面，UE保持与次基站小区间的连接，且对应于Split bearer位于次基站的每个协议实体/协议层配置不变。
步骤2：根据目标主基站在切换准备阶段发送的指示，第一基站对需要进行数据包转发的承载的数据包转发给目标主基站，同时发送的还有所述承载的数据包编号状态信息。本实施例以所有的数据承载都需要进行数据转发为例，那么转发的数据包包括：第一基站在向UE发送所述消息1时，位于 第一基站的每个数据承载的PDCP实体还没有收到对应的RLC实体(对于Split bearer而言可以包括位于次基站的RLC实体)指示已成功传输的PDCP SDU、第一基站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。
目标主基站收到第一基站转发的数据包后，将Split bearer的数据包进行PDCP的处理封装，并递交给次基站去进行传输。如果次基站在接收到来自目标主基站的首个PDCP PDU时，与所述Split bearer对应的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，即次基站会尽可能快的发送来自于目标主基站的数据包。
在成功接入目标小区且所述协议实体/协议层均成功启用新的无线资源配置后，所述UE向目标主基站发送消息4(RRC Connection Reconfiguration Complete)。在收到所述消息4后，目标主基站可以直接对UE进行用户面的传输调度。这样，对所述Split bearer的发送，包括了目标主基站经由自身与UE间的Uu口进行发送、以及目标主基站将部分PDCP PDU递交给次基站去发送。
步骤3：在切换完成阶段的路径转换程序中，所有数据承载的下行数据隧道端点会从第一基站转换到目标主基站。第一基站在收到目标主基站发送的消息6(UE上下文释放消息，UE CONTEXT RELEASE)后，通过消息7指示次基站释放两节点间与所述UE相关的X2连接，所述消息7可以借助于相关标准中定义的X2控制面消息(如次基站释放请求消息，SENB RELEASE REQUEST)，也可以是一条新的消息。所述释放程序不影响次基站对所述UE相关的用户面数据调度及资源配置，也不会影响次基站上保存的与所述UE相关的上下文。
具体实施例二：
系统架构、用户面模式及场景如具体实施方式所述。在基站内切换程序中，UE按照信令指示保持与次基站间的连接及资源配置不变；在向UE指示切换后，第一基站将以新配置处理的数据包递交给次基站去进一步传输。具体流程如图13示。
服务网关将MCG承载(MCG bearer)的数据包发送至第一基站，第一基站继续将MCG承载的数据包发送至用户设备；服务网关将Split承载(Split bearer)的数据包发送至第一基站，第一基站将Split承载的部分数据包发送至用户设备，还将Split承载的部分数据包发送至第二基站，由第二基站将Split承载的这部分数据包发送至用户设备。
步骤1：第一基站决定发起基站内切换程序，同时判决UE与次基站间的连接及资源配置不变。第一基站向UE发送RRC Connection Reconfiguration消息1，所述消息1除携带UE在第一基站的新资源配置(与相关标准定义类似)外，还需携带指示UE保留与次基站间的连接及资源配置的相关信元，可选的，所述信元不包括在mobilityControlInfo中。
所述UE根据所述消息1的指示，一方面离开第一基站小区、与目标小区进行同步并向所述目标小区发起随机接入；从协议栈的角度看，需按照新的资源配置对每个协议实体/协议层进行重建/复位的包括两部分，MCG bearer和Split bearer位于第一基站的协议栈。另一方面，UE保持与次基站小区间的连接，且对应于Split bearer位于次基站的每个协议实体/协议层配置不变。
步骤2：在向UE发送所述消息1后，第一基站向次基站递交的PDCP PDU应是以新配置的(即重建后的)PDCP实体进行封装处理后的PDU。所述PDU可以包括：第一基站在向UE发送所述消息1时，Split bearer位于第一基站的PDCP实体还没有收到对应的RLC实体(可以包括位于次基站的RLC实体)指示已成功传输的PDCP PDU、所述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。
如果次基站在接收到来自第一基站的首个以新配置进行处理的PDCP PDU时，与所述Split bearer对应的RLC实体缓存区中如果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，即次基站会尽可能快的发送来自于目标主基站的数据包。这一丢弃的行为可以有两种方式进行触发：1)第一基站向次基站发送一条控制面消息2，图示中以“主基站切换指示”为名称举例，这可以借助于相关标准中定义的次基站修正请求(SENB MODIFICATION REQUEST)消息或其他X2消息，也可以是一条新的消息；2)首个以新配置进行处理的PDCP PDU中携带一个指示符，表明自身是第 一个新配置的数据包。
步骤3：在成功接入目标小区且所述协议实体/协议层均成功启用新的无线资源配置后，所述UE向目标主基站发送消息4(RRC Connection Reconfiguration Complete)。在收到所述消息4后，第一基站可以恢复对UE的用户面传输调度。
具体实施例三：
系统架构、用户面模式及场景如具体实施方式所述，本实施例以UE配置有3个数据承载为例，其中，EPS bearer1与EPS bearer2属于MCG bearer、EPS bearer3属于Split bearer。在基站间切换程序中，目标主基站决定请求次基站再添加部分资源为EPS bearer2提供服务，即EPS bearer2转变为Split bearer，同时保持EPS bearer3在位于次基站的协议栈资源配置不变。具体流程如图14所示。
步骤1：第一基站向UE发送RRC Connection Reconfiguration消息1，所述UE根据消息1的指示，离开第一基站小区、与目标小区进行同步并向所述目标小区发起随机接入，同时保持与次基站小区间的连接。
在协议栈方面，所述UE对与EPS bearer1对应的每个协议实体/协议层、与EPS bearer3位于目标主基站侧的协议栈对应的每个协议实体/协议层按照目标主基站分配的新资源资源配置进行重建/复位，与EPS bearer3位于次基站侧的协议栈对应的每个协议实体/协议层配置保持不变。对于EPS bearer2，所述UE可先将对应的资源释放掉，再按照目标主基站分配的新资源资源配置重建对应于目标主基站的协议栈、按照次基站分配的新资源资源配置重建对应于次基站的协议栈。
步骤2：第一基站在切换准备阶段接收到目标主基站回复的确认消息后，一方面可向次基站发送通过消息2以指示次基站释放两节点间与所述UE相关的X2连接，所述消息2可以借助于相关标准中定义的X2控制面消息(如次基站释放请求消息，SENB RELEASE REQUEST)，也可以是一条新的消息。次基站在收到所述消息2后，如果与EPS bearer3对应的RLC实体缓存 区中还有来自于第一基站的数据包没有发送完毕，次基站会将所述数据包全部丢弃。
另一方面，按照目标主基站在切换准备阶段的指示，第一基站对需要进行数据包转发的承载的数据包转发给目标主基站，同时发送的还有所述承载的数据包编号状态信息。本实施例以所有的数据承载都需要进行数据转发为例，转发的数据包包括：第一基站在向UE发送所述消息1时，位于第一基站的每个数据承载的PDCP实体还没有收到对应的RLC实体(对于EPS bearer3而言可以包括位于次基站的RLC实体)指示已成功传输的PDCP SDU、第一基站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。
目标主基站收到第一基站转发的数据包后，将EPS bearer2和EPS bearer3的数据包通过PDCP实体进行处理封装，并递交给次基站去进行传输。如果次基站在接收到来自目标主基站的首个PDCP PDU时，与所述Split bearer对应的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，即次基站会尽可能快的发送来自于目标主基站的数据包。
在成功接入目标小区且所述协议实体/协议层均成功启用新的无线资源配置后，所述UE向目标主基站发送消息5(RRC Connection Reconfiguration Complete)。在收到所述消息5后，目标主基站可以直接对UE进行用户面的传输调度。这样，对所述Split bearer的发送，包括了目标主基站经由自身与UE间的Uu口进行发送、以及目标主基站将部分PDCP PDU递交给次基站去发送。
步骤3：在切换完成阶段的路径转换程序中，所有数据承载的下行数据隧道端点会从第一基站转换到目标主基站。在收到核心网关于路径转换成功的确认消息后，目标主基站指示第一基站释放与所述UE相关的上下文。
需要说明的是，切换程序前由次基站传输的Split bearer也可以由目标主基站决定在切换程序中转换到目标主基站去继续传输(即转换为MCG bearer)，但仍由次基站传输的Split bearer部分的资源配置不变、UE与次基站间的连接在切换过程中保持，可选的，次基站可在切换过程中继续对UE进行与保留的Split bearer对应的用户面数据传输调度。
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(例如处理器)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，例如通过集成电路来实现其相应功能，也可以采用软件功能模块的形式实现，例如通过处理器执行存储于存储器中的程序/指令来实现其相应功能。本发明不限制于任何特定形式的硬件和软件的结合。
本领域的普通技术人员应当理解，可以对本发明的技术方案进行修改或者等同替换，而不脱离本发明技术方案的精神和范围，均应涵盖在本发明的权利要求范围当中。
工业实用性
上述技术方案在用户设备的主服务基站进行切换时，能够提升用户设备与次基站间的数据传输性能，适用于各种类型的基站，在DC态UE传输数据和/或移动的过程中，当UE接入的主服务基站发生切换时，UE与连接的次基站间的用户面不会中断、即可继续传输数据，提升了用户设备传输数据的性能及吞吐量、提高了无线资源的使用效率，并节省了控制面信令。

Claims (26)

  1. 一种应用于终端的在切换程序中传输数据的方法，包括：
    接收源主基站发送的无线资源控制信令，所述无线资源控制信令携带与所述终端待接入的目标主基站对应的第一资源配置信息和与所述终端已接入的次基站对应的第二资源配置信息；
    当所述终端离开所述源主基站覆盖的服务小区时，按照所述第二资源配置信息保持与所述次基站的服务小区的无线连接，保留分担承载对应于次基站的协议层不变，并按照所述第一资源配置信息向所述目标主基站发起随机接入。
  2. 根据权利要求1所述的方法，还包括：
    保留分担承载对应于次基站的协议层的部分不变之后，与所述次基站进行所述分担承载的用户面数据的传输。
  3. 根据权利要求1所述的方法，其中，按照所述第一资源配置信息向所述目标主基站发起随机接入包括：
    按照所述第一资源配置信息将主小区组MCG承载的协议层和分担承载对应于所述目标主基站的协议层进行重建或者复位，并与所述目标主基站的服务小区进行同步，向所述目标主基站的服务小区发起随机接入。
  4. 根据权利要求2所述的方法，其中，与所述次基站进行所述分担承载的用户面数据的传输包括：
    接收所述次基站的调度信息；
    根据所述调度信息与所述次基站进行所述分担承载上的用户面数据的传输。
  5. 一种应用于目标主基站的在切换程序中传输数据的方法，包括：
    根据在终端切换程序的准备阶段中得出的判断结果进行资源分配，并向源主基站发送切换请求确认消息，所述切换请求确认携带与所述目标主基站对应的第一资源配置信息和与所述终端已接入的次基站对应的第二资源配置 信息。
  6. 根据权利要求5所述的方法，还包括：
    接收源主基站发送未成功传输的数据包汇聚协议PDCP的服务数据单元SDU、缓存的PDCP SDU以及后续接收到的PDCP SDU；
    所述未成功传输的PDCP SDU包括位于源主基站的PDCP子层未收到所述终端或者所述次基站指示成功传输的PDCP SDU，所述缓存的PDCP SDU包括位于所述源主基站的PDCP子层缓存区未传输至所述终端或者所述次基站的无线链路控制RLC子层的PDCP SDU，所述后续接收到的PDCP SDU包括所述终端离开所述源主基站覆盖的服务小区后从服务网关接收到的PDCP SDU。
  7. 根据权利要求6所述的方法，还包括：
    接收源主基站发送的与分担承载对应的PDCP SDU，将接收到的与所述分担承载对应的PDCP SDU经位于所述目标主基站的所述分担承载的PDCP子层处理后，转发至所述次基站。
  8. 一种应用于次基站的在切换程序中传输数据的方法，包括：
    按照终端已接入的次基站对应的第二资源配置信息保持与所述终端的无线连接，保留分担承载在次基站的协议层不变。
  9. 根据权利要求8所述的方法，还包括，
    接受目标主基站的通知，删除所述分担承载在次基站的协议层。
  10. 根据权利要求9所述的方法，其中，删除所述分担承载在次基站的协议层包括：
    清空所述源主基站发送的缓存在无线链路控制RLC子层中的数据包汇聚协议PDCP的协议数据单元PDU和/或释放所述分担承载对应的资源；所述分担承载对应的资源指不再保留在次基站的分担承载的资源。
  11. 根据权利要求8-10任一所述的方法，还包括：
    接收目标主基站发送的PDCP PDU，通过与所述终端的无线连接，将所述PDCP PDU发送至所述终端。
  12. 一种设置于终端的在切换程序中传输数据的装置，包括：
    接收模块，设置为接收源主基站发送的无线资源控制信令，所述无线资源控制信令携带与所述终端待接入的目标主基站对应的第一资源配置信息和与所述终端已接入的次基站对应的第二资源配置信息；
    传输模块，设置为当所述终端离开所述源主基站覆盖的服务小区时，按照所述第二资源配置信息保持与所述次基站的服务小区的无线连接，保留分担承载对应于次基站的协议层不变；
    接入模块，设置为当所述终端离开所述源主基站覆盖的服务小区时，按照所述第一资源配置信息向所述目标主基站发起随机接入。
  13. 根据权利要求12所述的装置，所述传输模块还设置为：
    与所述次基站进行所述分担承载的用户面数据的传输。
  14. 根据权利要求12所述的装置，其中，接入模块是设置为：
    按照所述第一资源配置信息将主小区组MCG承载的协议层和分担承载对应于所述目标主基站的协议层进行重建或者复位，并与所述目标主基站的服务小区进行同步，向所述目标主基站的服务小区发起随机接入。
  15. 根据权利要求13所述的装置，其中，所述传输模块是设置为通过如下方式实现与所述次基站进行所述分担承载的用户面数据的传输：
    接收所述次基站的调度信息；
    根据所述调度信息与所述次基站进行所述分担承载上的用户面数据的传输。
  16. 一种设置于目标主基站的在切换程序中传输数据的装置，包括：
    分配模块，设置为根据在终端切换程序的准备阶段中得出的判断结果进行资源分配，
    发送单元，设置为向源主基站发送切换请求确认消息，所述切换请求确认携带与所述目标主基站对应的第一资源配置信息和与所述终端已接入的次基站对应的第二资源配置信息。
  17. 根据权利要求16所述的装置，还包括：
    第一通信模块，设置为接收源主基站发送未成功传输的数据包汇聚协议PDCP的服务数据单元SDU、缓存的PDCP SDU以及后续接收到的PDCP SDU，所述未成功传输的PDCP SDU包括位于源主基站的PDCP子层未收到所述终端或者所述次基站指示成功传输的PDCP SDU，所述缓存的PDCP SDU包括与位于所述源主基站的PDCP子层缓存区未传输至所述终端或者所述次基站的无线链路控制RLC子层的PDCP SDU，所述后续接收到的PDCP SDU包括所述终端离开所述源主基站覆盖的服务小区后从服务网关接收到的PDCP SDU。
  18. 根据权利要求17所述的装置，
    所述第一通信模块，还设置为接收源主基站发送的与分担承载对应的PDCP SDU，将接收到的与所述分担承载对应的PDCP SDU经位于所述目标主基站的所述分担承载的PDCP子层处理后，转发至所述次基站。
  19. 一种设置于次基站的在切换程序中传输数据的装置，包括：
    处理模块，设置为按照终端已接入的次基站对应的第二资源配置信息保持与所述终端的无线连接，保留分担承载在次基站的协议层不变。
  20. 根据权利要求19所述的装置，还包括释放模块，设置为接受目标主基站的通知，删除所述分担承载在次基站的协议层。
  21. 根据权利要求20所述的装置，所述释放模块是设置为：
    清空所述源主基站发送的缓存在RLC子层中的数据包汇聚协议PDCP的协议数据单元PDU和/或释放所述分担承载对应的资源；所述分担承载对应的资源指不再保留在次基站的分担承载的资源。
  22. 根据权利要求19-21任一所述的装置，还包括：第二通信模块，设 置为接收目标主基站发送的PDCP PDU，通过与所述终端的无线连接，将所述PDCP PDU发送至所述终端。
  23. 一种在切换程序中传输数据的系统，包括：如权利要求12-15任一项所述的终端、源主基站、权利要求16-18任一项所述的目标主基站和权利要求19-22任一项所述的次基站，
    所述源主基站包括：
    通信模块，设置为接收目标主基站发送的切换请求确认消息，并向所述终端发送无线资源控制信令。
  24. 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1～4中任一项所述的方法。
  25. 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5～7中任一项所述的方法。
  26. 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8～11中任一项所述的方法。
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