WO2014026543A1 - 一种数据转发方法及设备 - Google Patents

一种数据转发方法及设备 Download PDF

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Publication number
WO2014026543A1
WO2014026543A1 PCT/CN2013/080453 CN2013080453W WO2014026543A1 WO 2014026543 A1 WO2014026543 A1 WO 2014026543A1 CN 2013080453 W CN2013080453 W CN 2013080453W WO 2014026543 A1 WO2014026543 A1 WO 2014026543A1
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WO
WIPO (PCT)
Prior art keywords
base station
source macro
sequence number
macro base
local
Prior art date
Application number
PCT/CN2013/080453
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English (en)
French (fr)
Inventor
杨义
张大钧
鲍炜
Original Assignee
电信科学技术研究院
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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Application filed by 电信科学技术研究院 filed Critical 电信科学技术研究院
Priority to EP13829816.1A priority Critical patent/EP2887735B1/en
Priority to US14/420,665 priority patent/US9872208B2/en
Publication of WO2014026543A1 publication Critical patent/WO2014026543A1/zh

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Classifications

    • 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
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/34—Flow control; Congestion control ensuring sequence integrity, e.g. using sequence numbers
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a data forwarding method and device. Background technique
  • the network architecture of the Evolved Universal Terrestrial Radio Access Network is shown in Figure 1.
  • the E-UTRAN consists of an evolved base station (eNB).
  • a control plane interface (X2-C interface) exists between neighboring eNBs.
  • UE User Equipment
  • the source eNB and the target eNB may also establish a user plane interface (X2-U interface) for the UE. For data forwarding.
  • the Mobility Management Entity is connected to the eNB by using an S1-MME interface.
  • the eNB completes the access network function and communicates with the UE through the air interface.
  • MME Mobility Management Entity
  • the S 1 -MME interface provides the UE with control plane services, including mobility management and bearer management functions.
  • the Serving GW is connected to the eNB by using an S1-U interface. For each UE attached to the network, one S-GW serves the service.
  • the S-GW is called the serving SGW of the UE.
  • the S1-U interface provides the user plane service for the UE, and the user plane data of the UE is carried in the S-GW and the eNB through the General Packet Radio Service (GPRS) Tunneling Protocol (GTP) of the S1-U interface. Transfer between.
  • GPRS General Packet Radio Service
  • GTP General Packet Radio Service
  • the UE is connected to the same eNB on both the control plane and the user plane of the air interface. If the UE needs to switch from the source eNB to the target eNB, the source eNB needs to configure the measurement configuration information for the UE, and the source eNB performs a handover decision according to the measurement result reported by the UE, and if the source eNB decides to perform the handover, sends a handover request message to the target eNB; The target eNB performs an admission decision according to the quality of service (QoS) of the bearer to be received, and when determining to allow the UE to be admitted, performs an underlay configuration preparation handover, and returns a handover request response message to the source eNB, the message
  • a radio resource control (RRC) container is included, where the container specifically includes a handover command for triggering the UE to perform handover, and further includes a bearer accepted by the target eNB for performing uplink/downlink data forwarding, and
  • RRC radio resource
  • the layer address and the tunnel endpoint identifier (TEID); after the source eNB forwards the handover command to the UE, the UE stops transmitting data at the source eNB; the source eNB sends the serial number status information of the current data (if not successfully sent)
  • the serial number of the downlink data packet the first one that the target eNB can allocate
  • the sequence number is sent to the target eNB, and the sequence number status information further includes an identifier (such as an X2AP ID, an X2 interface application layer identifier) allocated to the UE before the protocol, so that the target eNB can distinguish the UE to which the received sequence number belongs. .
  • the source eNB may also send downlink data packets received from the core network but not yet transmitted to the UE to the target eNB for the target eNB to transmit to the UE.
  • the source eNB may also send the uplink data packet of the UE whose sequence number is discontinuous received from the air interface to the target eNB, so that the target eNB sends the serial number consecutive data packet to the core after receiving the missing data packet retransmitted by the UE.
  • the UE sends a preamble to the target eNB, and establishes uplink synchronization with the target eNB.
  • the target eNB allocates uplink resources to the UE and the timing advance of the UE.
  • the UE returns a handover complete message to the target eNB, and data can be sent and received between the two.
  • the target eNB sends a path switch request to the MME
  • the MME sends the user plane transport layer address and the downlink GTP tunnel end identifier assigned by the target eNB to the Evolved Packet System (EPS) of each UE to the SGW.
  • the SGW transfers the downlink data transmission path of the UE to the target eNB, and the SGW returns a bearer modification response to the MME, and after the MME returns a path switch response to the target eNB, the user plane and the control plane of the UE are both switched to the target eNB, that is, in the Uu.
  • the UE establishes a user plane and a control plane radio bearer with the target eNB, that is, the path handover process is completed, and the source eNB may release related resources allocated for the UE.
  • a macro cell provides a basic coverage
  • a local cell provides hotspot coverage
  • a data/signaling interface exists between the Local Cell and the Macro Cell (wired/ The radio interface)
  • the UE can work under the Macro eNB or the Local eNB. Since the coverage of the cell controlled by the Local eNB is small and the number of served UEs is small, the UE connected to the Local eNB can often obtain a better service shield, such as: obtaining a higher service rate and a higher shield link. However, due to the large number of local eNBs and small coverage, the UE may need to frequently switch between the cell controlled by the Macro eNB and the cell controlled by the Local eNB during the mobile process.
  • the present invention provides a data forwarding method and device for solving the problem of the risk of communication interruption when a UE performs handover in an existing hierarchical network.
  • a data forwarding method includes:
  • the source macro base station acquires sequence number transmission status information of the uplink and downlink direction packet data convergence protocol PDCP data packet of the local base station currently accessed by the user equipment UE, where the control plane of the UE is connected to the source macro base station, and the user plane is connected. To the local base station;
  • the source macro base station sends the sequence number transmission status information to the target base station to be handed over by the UE, and the target base station establishes a user plane connection with the UE according to the sequence number transmission status data.
  • a data forwarding method includes:
  • the local base station receives the handover indication sent by the source macro base station to indicate that the user equipment UE switches to the target base station.
  • the control plane of the UE is connected to the source macro base station, and the user plane is connected to the local base station; the local base station sends the acknowledgement status information of the PDCP data packet to the source macro base station, And obtaining, by the source macro base station, the uplink and downlink PDCP data packets of the UE from the data packet that is not obtained by the local base station and is successfully sent by the local base station according to the successfully sent acknowledgement status information.
  • the serial number transmits status information and is sent to the target base station.
  • a data forwarding method includes:
  • the local base station receives a handover indication message or a data forwarding command message sent by the source macro base station to indicate that the user equipment UE is handed over to the target base station, where the control plane of the UE is connected to the source macro base station, and the user plane is connected to the Local base station;
  • the local base station sends a sequence number status to the source macro base station, and the source macro base station obtains a sequence number transmission status of the uplink and downlink PDCP data packets of the UE from the sequence number status 4 report. Information is sent to the target base station.
  • a network side device including:
  • An acquiring unit configured to obtain sequence number sending status information of an uplink and downlink PDCP data packet of a local base station currently accessed by the user equipment UE, where a control plane of the UE is connected to the network side device, and a user plane is connected to the Local base station;
  • a processing unit configured to send the sequence number sending status information to the target base station to be handed over by the UE, and establish, by the target base station, a user plane connection with the UE according to the sequence number sending status data.
  • a network side device including:
  • a receiving unit configured to receive, by the source macro base station, a handover indication message, used to indicate that the user equipment UE is handed over to the target base station, where a control plane of the UE is connected to the source macro base station, and a user plane is connected to the network side.
  • a sending unit configured to send, to the source macro base station, the successful sending acknowledgement status information of the PDCP data packet, where the source macro base station includes, according to the successfully sent acknowledgement status information, the locally stored PDCP data packet In the data packet that does not obtain the indication of successful transmission of the local base station, the sequence number transmission status information of the uplink and downlink PDCP data packets of the UE is obtained, and is sent to the target base station.
  • a network side device including:
  • a receiving unit configured to receive a handover indication message or a data forwarding command message sent by the source macro base station to indicate that the user equipment UE switches to the target base station, where the control plane of the UE is connected to the source macro base station, and the user plane Connected to the network side device;
  • a sending unit configured to send a sequence number status report to the source macro base station, where the source macro base station obtains sequence number sending status information of the uplink and downlink PDCP data packets of the UE from the sequence number status 4 report, And sent to the target base station.
  • the control plane of the UE is connected to the source macro base station, and the UE is used.
  • the connection of the user plane to the local base station can effectively reduce the risk of communication interruption when the UE performs handover in the existing hierarchical network.
  • the source macro base station acquires the sequence number transmission status information of the PDCP data packet of the uplink and downlink direction of the local base station currently accessed by the UE, and sends the sequence number transmission status information to the target base station to be switched by the UE, according to the sequence of the target base station.
  • FIG. 1 is a schematic diagram of an E-UTRAN network architecture in the prior art
  • FIG. 2 is a schematic diagram of a hierarchical network architecture in the prior art
  • FIG. 3 is a schematic diagram of a network architecture in which a user plane and a control plane are separated according to an embodiment of the present invention
  • FIG. 4 is a network architecture of a first control plane separated from a user plane according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a user plane protocol stack in a first network architecture according to an embodiment of the present invention
  • FIG. 6 is a network architecture of a second control plane separated from a user plane according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a user plane protocol stack in a second network architecture according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a control plane protocol stack in a second network architecture according to an embodiment of the present invention.
  • FIG. 9 is a flowchart of a method for performing data forwarding in a first embodiment of the present invention.
  • FIG. 10 is a flowchart of a method for performing data forwarding in a second embodiment of the present invention.
  • FIG. 11 is a flowchart of a method for performing data forwarding in a third embodiment of the present invention.
  • FIG. 13 is a flow chart of a method according to a second embodiment of the present invention.
  • FIG. 14A is a schematic structural diagram of a network side device according to an embodiment of the present invention.
  • 14B is a schematic structural diagram of a physical entity of a network side device according to an embodiment of the present invention.
  • 15A is a schematic structural diagram of another network side device according to an embodiment of the present invention.
  • 15B is a schematic structural diagram of another network side device according to an embodiment of the present disclosure.
  • 16A is a schematic structural diagram of another network side device according to an embodiment of the present invention.
  • FIG. 16B is a schematic structural diagram of another network side device according to an embodiment of the present invention.
  • DETAILED DESCRIPTION In order to reduce the frequency of UE handover between cells, a network deployment manner in which user planes and control planes are separated is introduced. As shown in FIG. 3, the macro base station (Macro eNB) provides basic coverage, and the local base station (Local eNB) provides hotspot coverage.
  • Mocro eNB macro base station
  • Local eNB local base station
  • the control plane and the user plane of the UE Both are connected to the Macro eNB; when the UE moves to the overlapping area of the Macro eNB cell and the Local eNB cell, all or part of the UE user plane is transferred to the Local eNB to obtain a higher service transmission rate;
  • the face connection remains in the Macro eNB to prevent the control plane from failing to switch and causing the UE to drop calls.
  • the Macro eNB may be an LTE macro base station; the Local eNB may use multiple implementation forms, such as a LTE micro base station (Pico eNB) or a home base station (Home eNB) or a relay (Relay) device.
  • LTE micro base station Pico eNB
  • Home eNB home base station
  • Relay relay
  • the UE is simultaneously connected to two e Bs.
  • the first control plane is separated from the user plane.
  • the signalling radio bearer (SRB) of the UE is reserved on the Macro eNB, and all or part of the user plane is connected.
  • Packet Data Convergence Protocol (PDCP) / Radio Link Control (RLC) / Medium Access Control (MAC) / Physical Layer (PHY) are maintained in the Local eNB, where ML
  • the interface represents a logical interface between the Macro eNB and the Local eNB, and may be newly defined or an existing X2 interface.
  • the Macro eNB has a complete user plane and control plane protocol stack, that is, a user plane protocol stack and a control plane protocol stack that are peered with the UE.
  • the Local eNB provides a user plane data transmission function for the UE, and has a complete user plane protocol stack.
  • FIG. 5 it is a schematic diagram of a user plane protocol stack between the UE and the Local eNB.
  • the network architecture of the second control plane is separated from the user plane, where the SRB of the UE remains on the Macro eNB, and all or part of the user plane connection (ie, Data Radio Bearer (DRB))
  • DRB Data Radio Bearer
  • the PDCP/RLC/MAC/PHY is maintained in the Local eNB, where the ML interface represents a logical interface between the Macro eNB and the Local eNB, which may be newly defined or an existing X2 interface.
  • the uplink/downlink data of the UE is sent to the UE or the SGW via the Macro eNB.
  • the user plane protocol stack of the UE is as shown in FIG. 7.
  • the PDCP layer in the user plane protocol stack is located in the Macro eNB instead of the Local eNB, and the control plane protocol stack of the UE is as shown in FIG. 8.
  • the UE is connected to the Macro eNB and the Local eNB at the same time to obtain the control plane and the user plane connection respectively. Specifically, part of the bearer of the user plane of the UE is separated from the control plane, or all bearers of the user plane of the UE are separated from the control plane.
  • the Macro eNB has a complete user plane and control plane protocol stack, that is, a user plane protocol stack and a control plane protocol stack that are peered with the UE.
  • the Local eNB provides the user plane data transmission function for the UE, and has a complete user plane protocol stack.
  • the embodiment of the present invention provides a data forwarding method for carrying a separate scenario, to avoid the UE from the source macro base station.
  • the local base station switches to the adjacent target base station, causing data loss.
  • the target base station may be a macro base station that provides basic coverage in another hierarchical network adjacent to the source macro base station, or may need to establish a user plane connection and a control plane connection with the UE in another non-hierarchical network.
  • Ordinary base station may be a macro base station that provides basic coverage in another hierarchical network adjacent to the source macro base station, or may need to establish a user plane connection and a control plane connection with the UE in another non-hierarchical network.
  • Ordinary base station may be a macro base station that provides basic coverage in another hierarchical network adjacent to the source macro base station, or may need to establish a user plane connection and a control plane connection with the UE in another non-hierarchical network.
  • the source macro base station controls the UE to switch from the local base station under the source macro base station to the adjacent target base station, and the detailed process of data forwarding is as follows:
  • Step 901 The source macro base station acquires sequence number transmission status information of the PDCP data packet of the uplink and downlink direction of the local base station currently accessed by the UE, where the control plane of the UE is connected to the source macro base station, and the user plane is connected to the local base station.
  • Step 902 The source macro base station sends the sequence number transmission status information to the target base station to be switched by the UE, and the target base station establishes a user plane connection with the UE according to the sequence number transmission status information.
  • the source macro base station obtains the sequence number transmission status information from the sequence number status report sent by the local base station; or the source macro base station receives the data packet from the locally saved PDCP data packet that is not successfully received by the local base station. Get the serial number to send status information.
  • the source macro base station after the source macro base station sends a data forwarding command message to the local base station, it receives a sequence number status report sent by the local base station, and the source macro base station obtains the sequence number transmission status information from the sequence number status report.
  • the local base station stops transmitting and receiving data of the uplink and the downlink of the UE.
  • the data forwarding command message carries at least the bearer identifier that needs to be forwarded by the data, and carries the identifier of the UE, the transport layer address of the forwarding tunnel, and the TEID.
  • the TEID is a GTP tunnel endpoint identifier.
  • the source macro base station after the source macro base station sends the handover indication message to the local base station, it receives the sequence number status report sent by the local base station, and the source macro base station obtains the sequence number transmission status information from the sequence number status report.
  • the handover indication message includes an identifier of the UE.
  • the source macro base station sends a handover indication message to the local base station, and after receiving the successful transmission acknowledgement status information of the PDCP data packet returned by the local base station, the local base station is not successfully obtained from the locally stored PDCP data packet.
  • the serial number transmission status information is obtained in the data packet that sends the confirmation indication.
  • the local base station After the source macro base station sends the handover indication message to the local base station, the local base station stops transmitting and receiving the uplink and downlink data of the UE.
  • the source macro base station controls the UE to switch from the local base station under the source macro base station to the adjacent target base station, and the detailed process of the local base station performing data forwarding is as follows:
  • Step 1001 The local base station receives a handover indication message sent by the source macro base station to instruct the UE to switch to the target base station, where the control plane of the UE is connected to the source macro base station, and the user plane is connected to the local base station.
  • the handover indication message includes an identifier of the UE.
  • Step 1002 The local base station sends the acknowledgement status information of the PDCP data packet to the source macro base station, and the source macro base station sends the acknowledgement status information according to the success, and the successfully sent from the locally saved PDCP data packet is not obtained by the local base station.
  • the serial number transmission status information of the uplink and downlink PDCP data packets of the UE is obtained, and is sent to the target base station.
  • the local base station stops transmitting and receiving the uplink and downlink data of the UE, and then sends the acknowledgement status information of the PDCP data packet to the source macro base station.
  • the source macro base station controls the UE to switch from the local base station under the source macro base station to the adjacent target base station, and the detailed process of the local base station performing data forwarding is as follows:
  • Step 1101 The local base station receives a handover indication message or a data forwarding command message sent by the source macro base station to indicate that the UE switches to the target base station, where the control plane of the UE is connected to the source macro base station, and the user plane is connected to the local base station.
  • the handover indication message includes an identifier of the UE.
  • the data forwarding command message carries at least the bearer identifier that needs to be forwarded by the data, and carries the identifier of the UE, the transport layer address of the forwarding tunnel, and the TEID.
  • Step 1102 The local base station sends a sequence number status report to the source macro base station, and the source macro base station obtains the sequence number transmission status information of the uplink and downlink PDCP data packets of the UE from the sequence number status report, and sends the status information to the target base station.
  • the local base station stops transmitting and receiving the uplink and downlink data of the UE.
  • the first specific embodiment as shown in FIG. 12, for the network architecture in which the control plane and the user plane are separated as shown in FIG. 4, the specific process of the UE switching from the local base station under the control of the source macro base station to the target base station is as follows:
  • Step 1201 The source macro base station configures measurement configuration information for the UE, and is used by the UE to perform measurement according to the measurement configuration information, and the UE reports the measurement result to the source e B, and the measurement result is used for the auxiliary source e B to perform handover decision (Handover Desision). .
  • Step 1202 The source macro base station performs a handover decision.
  • Step 1203 After determining the handover, the source macro base station sends a handover request message (Handover Request) to the target eNB, where the message includes handover preparation related information.
  • Handover Request a handover request message
  • Step 1204 The target base station refers to the handover request message, performs an admission decision according to the QoS information of the bearer to be admitted, and performs an initial configuration preparation handover after determining to allow the UE to be admitted.
  • Step 1205 The target base station returns a handover request response (Handover Request Ack) to the source macro base station.
  • Step 1206 The source macro base station sends a data forwarding command (Data Forward Command) to the local base station that establishes a user plane connection with the UE, where the data forwarding command carries at least an EPS radio access bearer (E-RAB) that needs to perform data forwarding.
  • ID identifier
  • the source macro base station may only send the bearer information of the local base station in the E-RAB bearer that needs to be forwarded to the local base station.
  • the identifier of the UE is used to distinguish the identifier of the UE between the local base station and the source macro base station, and the identifier may be that the source macro base station has already been the UE on the control plane interface between the local base station and the source macro base station before the UE handover.
  • the assigned identifier can be used directly in the data forwarding command.
  • Step 1207 The local base station returns a Data Forward Response message to the source macro base station.
  • Step 1208 After receiving the data forward response message, the source macro base station may send a handover command to the UE (this step may also be omitted, and the source macro base station determines when to send a handover command to the UE).
  • Step 1209 The local base station sends the status information of the sequence number of the current data to the source macro base station, where the sequence number transmission status information carries at least the sequence number of the unsuccessfully transmitted downlink data packet, and the first sequence that the target base station can allocate.
  • the number also carries an identifier capable of distinguishing the UE between the local base station and the source macro base station.
  • Step 1210 The source macro base station converts the identifier of the UE in the sequence number transmission status information into an X2 interface application layer identifier allocated by the source macro base station and the target base station in the handover preparation phase according to the previously received data forwarding response message, if the UE A partial user plane connection is established with the source macro base station, and the source macro base station may also add the serial number transmission status information of the user plane managed by the source e B to the target e B.
  • Step 1211 Establish uplink synchronization between the UE and the target base station, and randomly access the target cell under the target base station.
  • Step 1212 The UE returns an RRC Connection Reconfiguration Complete message to the target base station.
  • Step 1213 The target base station sends a path switch request to the MME, where the request carries the user plane transport layer address and the downlink GTP tunnel end point identifier allocated by the target base station for the EPS bearers of each UE.
  • Step 1214 The MME initiates a bearer modification request to the SGW, and notifies the SGW of the user plane transport layer address and the downlink GTP tunnel endpoint identifier allocated by the target base station for the EPS bearer of each UE, and the SGW performs path conversion, and transfers the downlink data transmission path of the UE to Target base station.
  • Step 1215 The SGW returns a bearer modification response to the MME, where the response carries the user plane transport layer address and the uplink GTP tunnel endpoint identifier allocated by the SGW for the EPS bearer of each UE.
  • Step 1216 The MME returns a path switch request response to the target base station, and carries the user plane transport layer address and the uplink GTP tunnel end point identifier allocated by the SGW for the EPS bearer of each UE.
  • the SGW sends the data packet to the user plane transport layer address specified by the corresponding target base station according to the bearer to which it belongs, and sets the downlink GTP tunnel endpoint identifier;
  • the target base station sends it to the user plane transport layer address specified by the corresponding SGW according to the bearer to which it belongs, and sets the uplink GTP tunnel end identifier.
  • Step 1217 The target base station sends a UE Context Release request to the source macro base station, and the source macro base station releases the related resources.
  • Step 1218 The source macro base station sends a UE context release (UE Context Release) request to the local base station, The base station releases related resources.
  • UE context release UE Context Release
  • the second embodiment as shown in FIG. 13, for the network architecture in which the control plane and the user plane are separated as shown in FIG. 6, the specific process of the UE switching from the local base station under the control of the source macro base station to the target base station is as follows:
  • Step 1301 The source macro base station configures measurement configuration information for the UE, and the UE performs measurement according to the measurement configuration information, and the UE reports the measurement result to the source e B, and the measurement result is used for the auxiliary source e B to perform handover decision (Handover Desision). .
  • Step 1302 The source macro base station performs a handover decision.
  • Step 1303 After determining the handover, the source macro base station sends a handover request message (Handover Request) to the target eNB, where the message includes handover preparation related information.
  • Handover Request a handover request message
  • Step 1304 The target base station refers to the handover request message, performs an admission decision according to the QoS information of the bearer to be admitted, and performs an underlay configuration preparation handover after determining to allow the UE to be admitted.
  • Step 1305 The target base station returns a handover request response (Handover Request Ack) to the source macro base station.
  • Step 1306 The source macro base station sends a handover indication (HO indication) message to the local base station that establishes a user plane connection with the UE, where the message carries at least an identifier capable of distinguishing the UE between the local base station and the source macro base station, and the identifier may be Before the UE is handed over, the source macro base station allocates an identifier to the UE on the control plane interface between the local base station and the source macro base station, and the identifier can be directly used in the handover indication message. After receiving the handover indication message, the local base station stops transmitting downlink data to the UE, and stops scheduling the UE to send uplink data.
  • HO indication handover indication
  • Step 1307 The local base station sends a sequence number status report (SN Status Report) to the source macro base station, where the sequence number status message carries the downlink RLC transmission and acknowledgement status information.
  • SN Status Report sequence number status report
  • Step 1308 The source macro base station sends an RRC connection reconfiguration message to the UE.
  • Step 1309 The source macro base station sends the sequence number transmission status information of the current data determined according to the sequence number status report to the target base station.
  • Step 1310 Establish uplink synchronization between the UE and the target base station, and randomly access the target cell under the target base station.
  • Step 1311 The UE returns an RRC connection reconfiguration complete message to the target base station.
  • Step 1312 The target base station sends a path switching request to the MME, where the request carries the user plane transport layer address and the downlink GTP tunnel end point identifier allocated by the target base station for the EPS bearers of each UE.
  • Step 1313 The MME initiates a bearer modification request to the SGW, and notifies the SGW of the user plane transport layer address and the downlink GTP tunnel endpoint identifier allocated by the target base station for the EPS bearer of each UE, and the SGW performs path conversion, and transfers the downlink data transmission path of the UE to Target base station.
  • Step 1314 The SGW returns a bearer modification response to the MME, where the response carries the user plane transport layer address and the uplink GTP tunnel endpoint identifier allocated by the SGW for each UE's EPS bearer.
  • Step 1315 The MME returns a path switch request response to the target base station, and carries the user plane transport layer address and the uplink GTP tunnel end point identifier allocated by the SGW for the EPS bearer of each UE.
  • Step 1316 The target base station sends a UE Context Release request to the source macro base station, and the source macro base station releases the related resource.
  • Step 1317 The source macro base station sends a UE Context Release request to the local base station, and the local base station releases the related resources.
  • the embodiment of the present invention further provides a network side device.
  • the network side device refer to the specific implementation of the source macro base station in the foregoing first embodiment. It is no longer mentioned that the network side device mainly includes the following units:
  • the acquiring unit 1401 is configured to obtain the sequence number sending status information of the PDCP data packet of the uplink and downlink direction of the local base station currently accessed by the UE, where the control plane of the UE is connected to the network side device, and the user plane is connected to the local base station;
  • the processing unit 1402 is configured to send the sequence number sending status information to the target base station to be switched by the UE, and the target base station establishes a user plane connection with the UE according to the sequence number sending status data.
  • the obtaining unit 1401 is specifically configured to:
  • the serial number transmission status information is obtained from a data packet included in the locally stored PDCP data packet that has not been successfully transmitted by the local base station.
  • the obtaining unit 1401 is further configured to: after sending the data forwarding command message to the local base station, receive a sequence number status report sent by the local base station.
  • the obtaining unit 1401 is further configured to: after sending the handover indication message to the local base station, receive a sequence number status report sent by the local base station.
  • the obtaining unit 1401 is further configured to send a handover indication to the local base station before obtaining the sequence number transmission status information from the data packet that is not received by the local base station and is sent by the locally saved PDCP data packet. Message.
  • the hardware acquiring unit 1401 may be a processor
  • the processing unit 1402 may be a signal transceiving device including a transmitting and receiving antenna.
  • the network side device provided by the embodiment of the present invention includes:
  • the processor 14010 is configured to obtain sequence number sending status information of the PDCP data packet of the uplink and downlink direction of the local base station currently accessed by the UE, where the control plane of the UE is connected to the network side device, and the user plane is connected to the local base station;
  • the signal transceiving device 14020 is configured to send the sequence number transmission status information to the target base station to be switched by the UE, and the target base station establishes a user plane connection with the UE according to the sequence number transmission status data.
  • the processor 14010 is specifically configured to:
  • the data packet that is not successfully received by the local base station is sent.
  • the signal transceiving device 14020 is further configured to receive a sequence number status report sent by the local base station after transmitting the data forwarding command message to the local base station.
  • the signal transceiving device 14020 is further configured to: after sending the handover indication message to the local base station, receive a sequence number status report sent by the local base station.
  • the signal transceiving device 14020 is further configured to send a handover to the local base station before obtaining the sequence number transmission status information from the data packet in the locally saved PDCP data packet that is not obtained by the local base station. Indicate the message.
  • the embodiment of the present invention further provides a network side device.
  • the network side device refer to the specific implementation of the local base station in the foregoing second embodiment, where the repetition is not
  • the network side device mainly includes the following units:
  • the receiving unit 1501 is configured to receive, by the source macro base station, a handover indication message, used to indicate that the UE is handed over to the target base station, where the control plane of the UE is connected to the source macro base station, and the user plane is connected to the network side device.
  • the sending unit 1502 is configured to send, to the source macro base station, the successful sending acknowledgement status information of the PDCP data packet, and the source macro base station sends the acknowledgement status information according to the success, and the successfully sent from the locally saved PDCP data packet is not obtained by the local base station.
  • the serial number transmission status information of the uplink and downlink PDCP data packets of the UE is obtained, and is sent to the target base station.
  • the receiving unit 1501 is further configured to: after receiving the handover indication message, stop transmitting and receiving uplink and downlink data of the UE.
  • the receiving unit 1501 on the hardware may be a signal receiving device including a receiving antenna or the like, and the sending unit
  • the network side device provided by the embodiment of the present invention includes:
  • the first signal receiving device 15010 is configured to receive, by the source macro base station, a handover indication message, used to indicate that the UE is handed over to the target base station, where the control plane of the UE is connected to the source macro base station, and the user plane is connected to the network side device;
  • the first signal sending device 15020 is configured to send the acknowledgement status information of the PDCP data packet to the source macro base station, and the source macro base station sends the acknowledgement status information according to the success, and the local base station included in the locally stored PDCP data packet is not obtained.
  • the sequence number transmission status information of the uplink and downlink PDCP data packets of the UE is obtained, and is sent to the target base station.
  • the first signal receiving device 15010 is further configured to: after receiving the handover indication message, stop transmitting and receiving the uplink and downlink data of the UE.
  • the embodiment of the present invention further provides a network side device.
  • the network side device refer to the specific implementation of the local base station in the foregoing third embodiment, where the repetition is not
  • the network side device mainly includes the following units:
  • the receiving unit 1601 is configured to receive, by the source macro base station, a handover indication that is used to indicate that the UE switches to the target base station.
  • the information or data forwarding command message where the control plane of the UE is connected to the source macro base station, and the user plane is connected to the network side device;
  • the sending unit 1602 is configured to send a sequence number status report to the source macro base station, and the source macro base station slave sequence
  • the status report transmits the sequence number transmission status information of the uplink and downlink PDCP data packets of the UE, and sends the status information to the target base station.
  • the receiving unit 1601 is further configured to: after receiving the handover indication message or the data forwarding command message sent by the source macro base station, stop receiving and sending the uplink and downlink data of the UE.
  • the receiving unit 1601 on the hardware may be a signal receiving device including a receiving antenna or the like, and the sending unit
  • the network side device provided by the embodiment of the present invention includes:
  • the second signal receiving device 16010 is configured to receive, by the source macro base station, a handover indication message or a data forwarding command message for instructing the UE to switch to the target base station, where the control plane of the UE is connected to the source macro base station, and the user plane is connected to Network side device;
  • the second signal sending device 16020 is configured to send a sequence number status report to the source macro base station, and the source macro base station obtains sequence number transmission status information of the uplink and downlink PDCP data packets of the UE from the sequence number status report, and sends the status information to the target base station.
  • the second signal receiving device 16010 is further configured to: after receiving the handover indication message or the data forwarding command message sent by the source macro base station, stop transmitting and receiving the uplink and downlink data of the UE.
  • the control plane of the UE is connected to the source macro base station, and the user plane of the UE is connected to the local base station, which can effectively reduce the communication interruption when the UE performs handover in the existing hierarchical network. risk.
  • the source macro base station acquires the sequence number transmission status information of the PDCP data packet of the uplink and downlink direction of the local base station currently accessed by the UE, and sends the sequence number transmission status information to the target base station to be switched by the UE, according to the sequence of the target base station.
  • the number transmission status data establishes a user plane connection with the UE, so that the UE can switch the user plane connection from the local base station to the adjacent target base station, and can avoid data loss caused by the handover process.

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Abstract

本申请公开了一种数据转发方法及设备，用以解决现有的分层网络中UE进行切换时发生通信中断的风险的问题。该方法包括：源宏基站获取用户设备UE当前接入的本地基站的上下行方向PDCP数据包的序列号发送状态信息，其中，所述UE的控制面连接至所述源宏基站，用户面连接至所述本地基站；所述源宏基站将所述序列号发送状态信息发送给所述UE待切换的目标基站，由所述目标基站根据所述序列号发送状态数据建立与所述UE的用户面连接。

Description

一种数据转发方法及设备 本申请要求在 2012年 08月 15 日提交中国专利局、 申请号为 201210291254.4、 发明 名称为"一种数据转发方法及设备"的中国专利申请的优先权， 其全部内容通过引用结合在 本申请中。 技术领域
本发明涉及通信技术领域， 尤其涉及一种数据转发方法及设备。 背景技术
演进的通用陆地无线接入网 （Evolved Universal Terrestrial Radio Access Network, E-UTRAN )的网络架构如图 1所示， E-UTRAN由演进基站（eNB )组成。 相邻 eNB之间 存在控制面接口 （X2-C接口）， 在用户设备（User Equipment， UE )切换时， 源 eNB和目 标 eNB还可能为该 UE建立用户面接口 （X2-U接口）， 用于数据转发。
移动性管理实体 ( Mobility Management Entity, MME )与 eNB之间采用 S1-MME接 口相连； eNB完成接入网功能， 与 UE通过空口通信。 对于每一个附着到网络的 UE, 有 一个 MME为其提供服务， 该 MME称为 UE的服务 MME。 S 1 -MME接口为 UE提供对控 制面服务， 包括移动性管理和承载管理功能。
服务网关（ Serving GW, SGW )与 eNB之间采用 S1-U接口相连， 对于每一个附着到 网络的 UE, 有一个 S-GW为其提供服务， 该 S-GW称为 UE的服务 SGW。 S1-U接口为 UE 提供用户面服务， UE 的用户面数据通过 S1-U 接口的通用分组无线业务 ( General Packet Radio Service, GPRS ) 隧道协议（ GPRS Tunneling Protocol , GTP )承载 在 S-GW和 eNB之间传输。
E-UTRAN网络架构中， UE在空口的控制面和用户面都连接至同一个 eNB。 若 UE需 要从源 eNB切换至目标 eNB, 源 eNB需要对 UE配置测量配置信息， 源 eNB根据 UE上 报的测量结果进行切换判决， 若源 eNB决定要进行切换， 则向目标 eNB发送切换请求消 息； 目标 eNB根据该待接纳的承载的服务质量（ Quality of Service, QoS )等信息进行接纳 判决， 在确定允许接纳该 UE时， 进行底层配置准备切换， 并向源 eNB返回切换请求响应 消息， 该消息中包含一个无线资源控制 （ Radio Resource Control, RRC )容器， 该容器具 体包含用于触发 UE进行切换的切换命令，还包含目标 eNB所接受的进行上行 /下行数据转 发的承载，以及转发隧道的传输层地址和隧道端点标识（ Tunnel Endpoint Identifier, TEID ); 源 eNB将切换命令转发给 UE后， UE停止在源 eNB进行数据收发； 源 eNB将当前数据发 送的序列号状态信息（如未成功发送的下行数据包的序列号、 目标 eNB可以分配的第一个 序列号等）发送给目标 eNB, 该序列号状态信息中还包括协议之前为 UE分配的标识（如 X2AP ID, X2接口应用层标识）， 以使目标 eNB能够区分收到的序列号所属的 UE。源 eNB 还可以将从核心网接收的但尚未发送给 UE的下行数据包发送给目标 eNB, 以便目标 eNB 将其传输给 UE。 源 eNB还可以将从空口收到的序列号不连续的 UE的上行数据包发送给 目标 eNB , 以便目标 eNB在接收到 UE重发的缺少的数据包后， 将序号连续的数据包发送 给核心网； UE向目标 eNB发送前导码， 建立与目标 eNB的上行同步， 目标 eNB为 UE 分配上行资源以及 UE的定时提前量， UE向目标 eNB返回切换完成消息， 两者之间即可 进行数据收发； 之后， 目标 eNB向 MME发起路径转换请求， MME再将目标 eNB为各 UE的演进型分组系统（ Evolved Packet System, EPS )承载分配的用户面传输层地址和下 行 GTP隧道端点标识发送给 SGW, 由 SGW将 UE的下行数据传输路径转移至目标 eNB, SGW向 MME返回承载修改响应， 以及 MME向目标 eNB返回路径切换响应后， 将 UE 的用户面和控制面都切换到目标 eNB, 即在 Uu口， UE与目标 eNB建立用户面和控制面 无线承载， 即路径切换过程完成， 源 eNB可释放为该 UE所分配的相关资源。
在如图 2所示的现有分层网络中，宏小区（ Macro cell )提供基础覆盖，本地小区（ Local cell )提供热点覆盖， Local Cell与 Macro Cell之间存在数据 /信令接口 （有线 /无线接口）， UE可以工作在 Macro eNB或 Local eNB下。 由于 Local eNB控制的小区覆盖范围小、 服 务的 UE少， 所以， 连接到 Local eNB的 UE往往能获得更好的服务盾量， 如： 获得更高 的业务速率， 更高盾量的链路。 但是， 由于 Local eNB数量多、 覆盖小， 导致 UE在移动 过程中可能需要频繁在 Macro eNB控制的小区和 Local eNB控制的小区之间切换。 由于 UE的切换频率和次数都大大增加， 从而增加了 UE在进行切换时发生通信中断的风险。 发明内容 本发明提供一种数据转发方法及设备， 用以解决现有的分层网络中 UE进行切换时发 生通信中断的风险的问题。
本发明实施例提供的具体技术方案如下：
一种数据转发方法， 包括：
源宏基站获取用户设备 UE 当前接入的本地基站的上下行方向分组数据汇聚协议 PDCP数据包的序列号发送状态信息， 其中， 所述 UE的控制面连接至所述源宏基站， 用 户面连接至所述本地基站；
所述源宏基站将所述序列号发送状态信息发送给所述 UE待切换的目标基站， 由所述 目标基站根据所述序列号发送状态数据建立与所述 UE的用户面连接。
一种数据转发方法， 包括：
本地基站接收源宏基站发送的用于指示用户设备 UE 切换至目标基站的切换指示消 息， 其中， 所述 UE的控制面连接至所述源宏基站， 用户面连接至所述本地基站； 所述本地基站将 PDCP数据包的成功发送确认状态信息发送给所述源宏基站， 由所述 源宏基站根据所述成功发送确认状态信息， 从本地保存的 PDCP数据包中包含的未得到所 述本地基站的成功发送确认指示的数据包中， 获得所述 UE的上下行 PDCP数据包的序列 号发送状态信息， 并发送给所述目标基站。
一种数据转发方法， 包括：
本地基站接收源宏基站发送的用于指示用户设备 UE切换至目标基站的切换指示消息 或数据前转命令消息， 其中， 所述 UE的控制面连接至所述源宏基站， 用户面连接至所述 本地基站；
所述本地基站向所述源宏基站发送序列号状态 ·ί艮告 , 由所述源宏基站从所述序列号状 态 4艮告中获取所述 UE的上下行 PDCP数据包的序列号发送状态信息， 并发送给所述目标 基站。
一种网络侧设备， 包括：
获取单元， 用于获取用户设备 UE当前接入的本地基站的上下行方向 PDCP数据包的 序列号发送状态信息， 其中， 所述 UE的控制面连接至所述网络侧设备， 用户面连接至所 述本地基站；
处理单元， 用于将所述序列号发送状态信息发送给所述 UE待切换的目标基站， 由所 述目标基站根据所述序列号发送状态数据建立与所述 UE的用户面连接。
一种网络侧设备， 包括：
接收单元， 用于接收源宏基站发送的用于指示用户设备 UE切换至目标基站的切换指 示消息， 其中， 所述 UE的控制面连接至所述源宏基站， 用户面连接至所述网络侧设备； 发送单元， 用于将 PDCP数据包的成功发送确认状态信息发送给所述源宏基站， 由所 述源宏基站根据所述成功发送确认状态信息， 从本地保存的 PDCP数据包中包含的未得到 所述本地基站的成功发送确认指示的数据包中， 获得所述 UE的上下行 PDCP数据包的序 列号发送状态信息， 并发送给所述目标基站。
一种网络侧设备， 包括：
接收单元， 用于接收源宏基站发送的用于指示用户设备 UE切换至目标基站的切换指 示消息或数据前转命令消息， 其中， 所述 UE的控制面连接至所述源宏基站， 用户面连接 至所述网络侧设备；
发送单元， 用于向所述源宏基站发送序列号状态报告 , 由所述源宏基站从所述序列号 状态 4艮告中获取所述 UE的上下行 PDCP数据包的序列号发送状态信息， 并发送给所述目 标基站。
基于上述技术方案， 本发明实施例中， 将 UE的控制面连接至源宏基站， 将 UE的用 户面连接至本地基站， 能够有效降低现有的分层网络中 UE进行切换时发生通信中断的风 险。 并且， 源宏基站获取 UE当前接入的本地基站的上下行方向 PDCP数据包的序列号发 送状态信息， 并将该序列号发送状态信息发送给 UE待切换的目标基站， 由目标基站根据 该序列号发送状态数据建立与 UE的用户面连接， 从而能够实现 UE将用户面连接从本地 基站切换至相邻的目标基站， 且能够避免切换过程中导致数据丢失。 附图说明 图 1为现有技术中 E-UTRAN网络架构示意图；
图 2为现有技术中分层网络架构示意图；
图 3为本发明实施例中用户面和控制面分离的网络架构示意图；
图 4为本发明实施例中第一种控制面与用户面分离的网络架构；
图 5为本发明实施例中第一网络架构下的用户面协议栈示意图；
图 6为本发明实施例中第二种控制面与用户面分离的网络架构；
图 7为本发明实施例中第二种网络架构下用户面协议栈示意图；
图 8为本发明实施例中第二种网络架构下控制面协议栈示意图；
图 9为本发明第一实施例中进行数据转发的方法流程图；
图 10为本发明第二实施例中进行数据转发的方法流程图；
图 11为本发明第三实施例中进行数据转发的方法流程图；
图 12为本发明第一具体实施例的方法流程图；
图 13为本发明第二具体实施例的方法流程图；
图 14A为本发明实施例中网络侧设备的功能结构示意图；
图 14B为本发明实施例中网络侧设备的实体结构示意图；
图 15 A为本发明实施例中另一网络侧设备的功能结构示意图；
图 15B为本发明实施例中另一网络侧设备的实体结构示意图；
图 16 A为本发明实施例中另一网络侧设备的功能结构示意图；
图 16B为本发明实施例中另一网络侧设备的实体结构示意图。 具体实施方式 为了降低 UE在小区之间进行切换的频率， 一种用户面和控制面分离的网络部署方式 被引入。 如附图 3所示， 宏基站（Macro eNB )提供基础覆盖， 本地基站（ Local eNB )提 供热点覆盖， 在该方式下， 当 UE在只有 Macro eNB小区覆盖的区域， UE的控制面和用 户面都连接到 Macro eNB； 当 UE移动到 Macro eNB小区和 Local eNB小区重叠覆盖区域 时， UE用户面全部或者部分承载被转移到 Local eNB , 以获得更高的业务传输速率； 控制 面连接仍然保持在 Macro eNB , 以防止控制面连接切换失败造成 UE掉话。
其中， Macro eNB可以是 LTE宏基站； Local eNB是可以釆用多种实现形式， 比如 LTE 的微基站（Pico eNB )或家庭基站（Home eNB )或中继 （Relay)设备等。
在 UE用户面和控制面分离的情况下， UE同时连接到两个 e B。 如附图 4所示为第 一种控制面与用户面分离的网络架构，其中， UE的信令无线承载（ Signalling Radio Bearer, SRB )保留在 Macro eNB上， 而全部或部分用户面连接的分组数据汇聚协议（ Packet Data Convergence Protocol, PDCP ) /无线链路控制 ( Radio Link Control, RLC ) /媒体接入控制 层（Medium Access Control, MAC ) /物理层（PHY )保持在 Local eNB, 其中， M-L接口 表示 Macro eNB与 Local eNB之间的逻辑接口， 可以是新定义的， 也可以是已有的 X2接 口。 UE的上行数据到达 Local eNB之后直接发往 SGW, UE的下行数据到达 SGW之后， 直接发往 Local eNB, 从而减少了 Macro eNB对 UE数据包的处理负担。
该架构中， Macro eNB具有完整的用户面和控制面协议栈， 即与 UE对等的用户面协 议栈和控制面协议栈。 Local eNB为 UE提供用户面数据传输功能，具有完整的用户面协议 栈， 如附图 5所示为 UE与 Local eNB之间的用户面协议栈示意图。
如附图 6所示为第二种控制面与用户面分离的网络架构， 其中， UE 的 SRB保留在 Macro eNB上， 而全部或部分用户面连接（即数据无线承载（ Data Radio Bearer, DRB ) ) 的 PDCP/RLC/MAC/PHY保持在 Local eNB ,其中， M-L接口表示 Macro eNB与 Local eNB 之间的逻辑接口， 可以是新定义的， 也可以是已有的 X2接口。 UE的上 /下行数据都是经 Macro eNB发往 UE或者 SGW。
该架构中， UE的用户面协议栈如附图 7所示，该用户面协议栈中 PDCP层位于 Macro eNB而不是 Local eNB, UE的控制面协议栈如附图 8所示。
在用户面与控制面分离的网络架构下， UE同时与 Macro eNB和 Local eNB相连， 分 别获得控制面和用户面连接。 具体可以为， UE 的用户面的部分承载与控制面分离， 或者 UE的用户面的全部承载与控制面分离。
用户面和控制面分离情况下， Macro eNB具有完整的用户面和控制面协议栈，即与 UE 对等的用户面协议栈和控制面协议栈。 Local eNB为 UE提供用户面数据传输功能，具有完 整的用户面协议栈。
在用户面和控制面分离的分层网络架构中， 当 UE从 Local eNB移动到相邻的 Macro eNB的覆盖范围时， UE需要在 Local eNB与该相邻的 Macro eNB之间进行切换， 但是， 由于 UE仅与 Local eNB建立用户面连接，控制面连接仍然保持在源 Macro eNB ,使得 Local eNB与相邻 Macro eNB之间并不存在直接的控制面接口 （即 X2-C接口）， 无法直接与相 邻宏基站建立数据转发隧道， 从而在 UE切换过程中， 可能会导致数据丢失。 鉴于此， 本 发明实施例提供了一种用于承载分离场景的数据转发方法， 用以避免 UE从源宏基站下的 本地基站切换至相邻的目标基站过程中， 导致数据丢失。
下面结合附图对本发明优选的实施方式进行详细说明。
以下实施例中， 目标基站可以是与源宏基站相邻的另一分层网络中提供基础覆盖的宏 基站， 也可以是另一非分层网络中需要与 UE建立用户面连接和控制面连接的普通基站。
本发明第一实施例中， 如附图 9所示， 源宏基站控制 UE从源宏基站下的本地基站切 换至相邻的目标基站过程中， 进行数据转发的详细过程如下：
步骤 901 : 源宏基站获取 UE当前接入的本地基站的上下行方向 PDCP数据包的序列 号发送状态信息， 其中， UE的控制面连接至源宏基站， 用户面连接至本地基站。
步骤 902: 源宏基站将该序列号发送状态信息发送给 UE待切换的目标基站， 由该目 标基站根据序列号发送状态信息建立与 UE的用户面连接。
具体地， 源宏基站从本地基站发送的序列号状态报告中获取序列号发送状态信息； 或 者， 源宏基站从本地保存的 PDCP数据包中包含的未得到本地基站的成功发送确认指示的 数据包中获得序列号发送状态信息。
在一个具体实现中， 源宏基站向本地基站发送数据前转命令消息后， 接收本地基站发 送的序列号状态报告 , 源宏基站再从该序列号状态报告中获取序列号发送状态信息。
优选地， 源宏基站向本地基站发送数据前转命令消息后， 本地基站停止对 UE的上下 行数据的收发。
其中， 数据前转命令消息中至少携带有需要数据前转的承载标识， 除此之外， 还携带 有 UE的标识、 转发隧道的传输层地址以及 TEID等。 较佳地， 该 TEID为 GTP隧道端点 标识。
在另一个具体实现中， 源宏基站向本地基站发送切换指示消息后， 接收本地基站发送 的序列号状态报告， 源宏基站从该序列号状态报告中获取序列号发送状态信息。
其中， 切换指示消息中包含 UE的标识。
在另一个具体实现中， 源宏基站向本地基站发送切换指示消息， 接收本地基站返回的 PDCP数据包的成功发送确认状态信息后， 从本地保存的 PDCP数据包中包含的未得到本 地基站的成功发送确认指示的数据包中获得序列号发送状态信息。
其中， 源宏基站向本地基站发送切换指示消息之后， 本地基站停止对 UE的上下行数 据的收发。
本发明第二实施例中， 如附图 10所示， 源宏基站控制 UE从源宏基站下的本地基站切 换至相邻的目标基站过程中， 本地基站进行数据转发的详细过程如下：
步骤 1001 : 本地基站接收源宏基站发送的用于指示 UE切换至目标基站的切换指示消 息， 其中， UE的控制面连接至源宏基站， 用户面连接至本地基站。
其中， 切换指示消息中包含 UE的标识。 步骤 1002: 本地基站将 PDCP数据包的成功发送确认状态信息发送给源宏基站， 由源 宏基站根据该成功发送确认状态信息， 从本地保存的 PDCP数据包中包含的未得到本地基 站的成功发送确认指示的数据包中， 获得 UE的上下行 PDCP数据包的序列号发送状态信 息， 并发送给目标基站。
具体地，本地基站接收切换指示消息后，停止对 UE的上下行数据的收发，然后将 PDCP 数据包的成功发送确认状态信息发送给源宏基站。
本发明第三实施例中， 如附图 11所示， 源宏基站控制 UE从源宏基站下的本地基站切 换至相邻的目标基站过程中， 本地基站进行数据转发的详细过程如下：
步骤 1101 : 本地基站接收源宏基站发送的用于指示 UE切换至目标基站的切换指示消 息或数据前转命令消息， 其中， UE的控制面连接至源宏基站， 用户面连接至本地基站。
其中， 切换指示消息中包含 UE的标识。
其中， 数据前转命令消息中至少携带有需要数据前转的承载标识， 除此之外还携带有 UE的标识、 转发隧道的传输层地址以及 TEID。
步骤 1102： 本地基站向源宏基站发送序列号状态报告 , 由源宏基站从序列号状态报告 中获取 UE的上下行 PDCP数据包的序列号发送状态信息， 并发送给目标基站。
较佳地， 本地基站接收源宏基站发送的切换指示消息或数据前转命令消息后， 停止对 UE的上下行数据的收发。
以下通过两个具体实施例对本发明上述实施例中提供的 UE从源宏基站下的本地基站 切换至相邻基站的具体过程进行详细说明。
第一具体实施例， 如附图 12所示， 针对附图 4所示的控制面与用户面分离的网络架 构， UE从源宏基站控制下的本地基站切换至目标基站的具体过程如下：
步骤 1201： 源宏基站对 UE配置测量配置信息， 以用于 UE根据该测量配置信息执行 测量， UE上报测量结果给源 e B, 该测量结果用于辅助源 e B进行切换判决 （Handover Desision )。
步骤 1202： 源宏基站进行切换判决。
步骤 1203: 源宏基站在决定进行切换后， 向目标 eNB发送切换请求消息 （Handover Request ), 该消息中包含切换准备相关信息。
步骤 1204: 目标基站参考该切换请求消息， 根据待接纳的承载的 QoS信息进行接纳 判决， 并在确定允许接纳该 UE后， 进行底层配置准备切换。
步骤 1205: 目标基站向源宏基站返回切换请求响应 （ Handover Request Ack )。
步骤 1206: 源宏基站向与 UE 建立用户面连接的本地基站发送数据前转命令 ( Data Forward Command ), 该数据前转命令中至少携带需要进行数据转发的 EPS无线接入承载 ( E-RAB )承载信息以及 UE的标识， 该 E-RAB承载信息包括： 承载的标识（ID )、 下行 转发隧道的传输层地址和隧道 TEID, 上行转发隧道的传输层地址和隧道 TEID。 较佳地， 源宏基站可以只将需要转发的 E-RAB承载中位于本地基站的承载信息发送给本地基站。 UE的标识是用于在本地基站和源宏基站之间区分 UE的标识，该标识可以是在 UE切换之 前， 源宏基站已经在本地基站和源宏基站之间的控制面接口上为该 UE分配的标识， 数据 前转命令中可直接使用该标识。
步骤 1207: 本地基站向源宏基站返回数据前转响应 （ Data Forward Response ) 消息。 步骤 1208: 源宏基站在收到该数据前转响应消息后， 可向 UE发送切换命令（该步骤 也可省略， 源宏基站决定何时向 UE发送切换命令）。
步骤 1209: 本地基站向当前数据的序列号发送状态信息发送给源宏基站， 该序列号发 送状态信息中至少携带有未成功发送的下行数据包的序列号， 目标基站可以分配的第一个 序列号等， 还携带能够在本地基站和源宏基站之间区分 UE的标识。
步骤 1210: 源宏基站根据之前收到的数据前转响应消息， 将序列号发送状态信息中的 UE的标识转化为源宏基站和目标基站在切换准备阶段分配的 X2接口应用层标识， 若 UE 与源宏基站建立了部分用户面连接， 则源宏基站还可以在序列号发送状态信息中加入源 e B管理的用户面的序列号发送状态信息， 发送给目标 e B。
步骤 1211： UE与目标基站之间建立上行同步， 随机接入目标基站下的目标小区。 步骤 1212: UE向目标基站返回 RRC连接重配完成消息。
步骤 1213： 目标基站向 MME发起路径转换请求， 该请求中携带目标基站为各 UE的 EPS承载分配的用户面传输层地址和下行 GTP隧道端点标识。
步骤 1214: MME向 SGW发起承载修改请求， 将目标基站为各 UE的 EPS承载分配 的用户面传输层地址和下行 GTP隧道端点标识通知 SGW, SGW进行路径转换， 将 UE的 下行数据传输路径转移至目标基站。
步骤 1215: SGW向 MME返回承载修改响应， 该响应中携带 SGW为各 UE的 EPS 承载分配的用户面传输层地址和上行 GTP隧道端点标识。
步骤 1216: MME向目标基站返回路径转换请求响应， 携带 SGW为各 UE的 EPS承 载分配的用户面传输层地址和上行 GTP隧道端点标识。
至此， 路径转换过程完成， 此后发送 UE的下行数据包括： SGW根据其所属承载将该 数据包发送到对应的目标基站指定的用户面传输层地址， 并设置下行 GTP隧道端点标识； 对于 UE发出的上行数据包， 目标基站会根据其所属承载将其发送到对应的 SGW指定的 用户面传输层地址， 并设置上行 GTP隧道端点标识。
步骤 1217： 目标基站向源宏基站发送 UE上下文释放 ( UE Context Release )请求， 源 宏基站释放相关资源。
步骤 1218： 源宏基站向本地基站发送 UE上下文释放 ( UE Context Release )请求， 本 地基站释放相关资源。
第二具体实施例， 如附图 13所示， 针对附图 6所示的控制面与用户面分离的网络架 构， UE从源宏基站控制下的本地基站切换至目标基站的具体过程如下：
步骤 1301： 源宏基站对 UE配置测量配置信息， 以用于 UE根据该测量配置信息执行 测量， UE上报测量结果给源 e B, 该测量结果用于辅助源 e B进行切换判决 （Handover Desision )。
步骤 1302： 源宏基站进行切换判决。
步骤 1303: 源宏基站在决定进行切换后， 向目标 eNB发送切换请求消息 （Handover Request ), 该消息中包含切换准备相关信息。
步骤 1304: 目标基站参考该切换请求消息， 根据待接纳的承载的 QoS信息进行接纳 判决， 并在确定允许接纳该 UE后， 进行底层配置准备切换。
步骤 1305: 目标基站向源宏基站返回切换请求响应 （ Handover Request Ack )。
步骤 1306:源宏基站向与 UE建立用户面连接的本地基站发送切换指示（ HO indication ) 消息， 该消息中至少携带能够在本地基站和源宏基站之间区分 UE的标识， 该标识可以是 在 UE切换之前， 源宏基站在本地基站和源宏基站之间的控制面接口上为该 UE分配的标 识， 切换指示消息中可直接使用该标识。 本地基站在收到该切换指示消息后， 停止对 UE 发送下行数据 , 以及停止调度 UE发送上行数据。
步骤 1307: 本地基站向源宏基站发送序列号状态报告（SN Status Report ), 该序列号 状态 4艮告中携带下行 RLC的发送和确认状态信息。
步骤 1308: 源宏基站向 UE发送 RRC连接重配消息。
步骤 1309: 源宏基站将根据序列号状态报告确定的当前数据的序列号发送状态信息发 送给目标基站。
步骤 1310： UE与目标基站之间建立上行同步， 随机接入目标基站下的目标小区。 步骤 1311： UE向目标基站返回 RRC连接重配完成消息。
步骤 1312： 目标基站向 MME发起路径转换请求， 该请求中携带目标基站为各 UE的 EPS承载分配的用户面传输层地址和下行 GTP隧道端点标识。
步骤 1313: MME向 SGW发起承载修改请求， 将目标基站为各 UE的 EPS承载分配 的用户面传输层地址和下行 GTP隧道端点标识通知 SGW, SGW进行路径转换， 将 UE的 下行数据传输路径转移至目标基站。
步骤 1314: SGW向 MME返回承载修改响应， 该响应中携带 SGW为各 UE的 EPS 承载分配的用户面传输层地址和上行 GTP隧道端点标识。
步骤 1315: MME向目标基站返回路径转换请求响应， 携带 SGW为各 UE的 EPS承 载分配的用户面传输层地址和上行 GTP隧道端点标识。 步骤 1316： 目标基站向源宏基站发送 UE上下文释放 ( UE Context Release )请求， 源 宏基站释放相关资源。
步骤 1317： 源宏基站向本地基站发送 UE上下文释放 ( UE Context Release )请求， 本 地基站释放相关资源。
基于同一发明构思， 如附图 14A所示， 本发明实施例还提供了一种网络侧设备， 该网 络侧设备的具体实施可参见上述第一实施例中源宏基站的具体实施， 重复之处不再赞述， 该网络侧设备主要包括以下单元：
获取单元 1401 , 用于获取 UE当前接入的本地基站的上下行方向 PDCP数据包的序列 号发送状态信息， 其中， UE的控制面连接至网络侧设备， 用户面连接至本地基站；
处理单元 1402, 用于将序列号发送状态信息发送给 UE待切换的目标基站， 由目标基 站根据序列号发送状态数据建立与 UE的用户面连接。
其中， 获取单元 1401具体用于：
从本地基站发送的序列号状态报告中获取序列号发送状态信息；
或者，
从本地保存的 PDCP数据包中包含的未得到本地基站的成功发送确认指示的数据包中 获得序列号发送状态信息。
在一个具体实现中， 获取单元 1401 还用于向本地基站发送数据前转命令消息后， 接 收本地基站发送的序列号状态报告。
在另一个具体实现中， 获取单元 1401 还用于向本地基站发送切换指示消息后， 接收 本地基站发送的序列号状态报告。
在另一个具体实现中， 获取单元 1401还用于从本地保存的 PDCP数据包中包含的未 得到本地基站的成功发送确认指示的数据包中获得序列号发送状态信息之前， 向本地基站 发送切换指示消息。
具体的， 在硬件上获取单元 1401可以是处理器， 处理单元 1402可以是包含收发天线 等的信号收发装置， 此时， 如图 14B所示， 本发明实施例提供的网络侧设备包括：
处理器 14010, 用于获取 UE当前接入的本地基站的上下行方向 PDCP数据包的序列 号发送状态信息， 其中， UE的控制面连接至网络侧设备， 用户面连接至本地基站；
信号收发装置 14020, 用于将序列号发送状态信息发送给 UE待切换的目标基站， 由 目标基站根据序列号发送状态数据建立与 UE的用户面连接。
其中， 处理器 14010具体用于：
从本地基站发送的序列号状态报告中获取序列号发送状态信息；
或者，
从本地保存的 PDCP数据包中包含的未得到本地基站的成功发送确认指示的数据包中 获得序列号发送状态信息。
在一个具体实现中， 信号收发装置 14020还用于在向本地基站发送数据前转命令消息 后， 接收本地基站发送的序列号状态报告。
在另一个具体实现中， 信号收发装置 14020还用于向本地基站发送切换指示消息后， 接收本地基站发送的序列号状态报告。
在另一个具体实现中， 信号收发装置 14020还用于从本地保存的 PDCP数据包中包含 的未得到本地基站的成功发送确认指示的数据包中获得序列号发送状态信息之前， 向本地 基站发送切换指示消息。
基于同一发明构思， 如附图 15A所示， 本发明实施例还提供了一种网络侧设备， 该网 络侧设备的具体实施可参见上述第二实施例中本地基站的具体实施， 重复之处不再赞述， 该网络侧设备主要包括以下单元：
接收单元 1501 , 用于接收源宏基站发送的用于指示 UE切换至目标基站的切换指示消 息， 其中， UE的控制面连接至源宏基站， 用户面连接至网络侧设备；
发送单元 1502, 用于将 PDCP数据包的成功发送确认状态信息发送给源宏基站， 由源 宏基站根据成功发送确认状态信息， 从本地保存的 PDCP数据包中包含的未得到本地基站 的成功发送确认指示的数据包中，获得 UE的上下行 PDCP数据包的序列号发送状态信息， 并发送给目标基站。
其中， 接收单元 1501还用于接收切换指示消息后， 停止对 UE的上下行数据的收发。 具体的， 在硬件上接收单元 1501 可以是包含接收天线等的信号接收装置， 发送单元
1502可以是包含发送天线等的信号发送装置， 此时， 如图 15B所示， 本发明实施例提供的 网络侧设备包括：
第一信号接收装置 15010, 用于接收源宏基站发送的用于指示 UE切换至目标基站的 切换指示消息， 其中， UE的控制面连接至源宏基站， 用户面连接至网络侧设备；
第一信号发送装置 15020, 用于将 PDCP数据包的成功发送确认状态信息发送给源宏 基站， 由源宏基站根据成功发送确认状态信息， 从本地保存的 PDCP数据包中包含的未得 到本地基站的成功发送确认指示的数据包中， 获得 UE的上下行 PDCP数据包的序列号发 送状态信息， 并发送给目标基站。
其中， 第一信号接收装置 15010还用于接收切换指示消息后， 停止对 UE的上下行数 据的收发。
基于同一发明构思， 如附图 16A所示， 本发明实施例还提供了一种网络侧设备， 该网 络侧设备的具体实施可参见上述第三实施例中本地基站的具体实施， 重复之处不再赞述， 该网络侧设备主要包括以下单元：
接收单元 1601 , 用于接收源宏基站发送的用于指示 UE切换至目标基站的切换指示消 息或数据前转命令消息， 其中， UE的控制面连接至源宏基站， 用户面连接至网络侧设备； 发送单元 1602, 用于向源宏基站发送序列号状态报告， 由源宏基站从序列号状态报告 中获取 UE的上下行 PDCP数据包的序列号发送状态信息， 并发送给目标基站。
其中， 接收单元 1601 还用于接收源宏基站发送的切换指示消息或数据前转命令消息 后， 停止对 UE的上下行数据的收发。
具体的， 在硬件上接收单元 1601 可以是包含接收天线等的信号接收装置， 发送单元
1602可以是包含发送天线等的信号发送装置， 此时， 如图 16B所示， 本发明实施例提供的 网络侧设备包括：
第二信号接收装置 16010, 用于接收源宏基站发送的用于指示 UE切换至目标基站的 切换指示消息或数据前转命令消息， 其中， UE 的控制面连接至源宏基站， 用户面连接至 网络侧设备；
第二信号发送装置 16020, 用于向源宏基站发送序列号状态报告， 由源宏基站从序列 号状态报告中获取 UE的上下行 PDCP数据包的序列号发送状态信息，并发送给目标基站。
其中， 第二信号接收装置 16010还用于接收源宏基站发送的切换指示消息或数据前转 命令消息后， 停止对 UE的上下行数据的收发。
基于上述技术方案， 本发明实施例中， 将 UE的控制面连接至源宏基站， 将 UE的用 户面连接至本地基站， 能够有效降低现有的分层网络中 UE进行切换时发生通信中断的风 险。 并且， 源宏基站获取 UE当前接入的本地基站的上下行方向 PDCP数据包的序列号发 送状态信息， 并将该序列号发送状态信息发送给 UE待切换的目标基站， 由目标基站根据 该序列号发送状态数据建立与 UE的用户面连接， 从而能够实现 UE将用户面连接从本地 基站切换至相邻的目标基站， 且能够避免切换过程中导致数据丢失。
显然， 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和 范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内， 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种数据转发方法， 其特征在于， 包括：
源宏基站获取用户设备 UE 当前接入的本地基站的上下行方向分组数据汇聚协议 PDCP数据包的序列号发送状态信息， 其中， 所述 UE的控制面连接至所述源宏基站， 用 户面连接至所述本地基站；
所述源宏基站将所述序列号发送状态信息发送给所述 UE待切换的目标基站， 由所述 目标基站根据所述序列号发送状态信息建立与所述 UE的用户面连接。
2、 如权利要求 1所述的方法， 其特征在于， 源宏基站获取用户设备 UE当前接入的本 地基站的上下行方向 PDCP数据包的序列号发送状态信息， 具体包括：
所述源宏基站从所述本地基站发送的序列号状态报告中获取所述序列号发送状态信 息；
或者，
所述源宏基站从本地保存的 PDCP数据包中包含的未得到所述本地基站的成功发送确 认指示的数据包中获得所述序列号发送状态信息。
3、 如权利要求 2 所述的方法， 其特征在于， 所述源宏基站从所述本地基站发送的序 列号状态报告中获取所述序列号发送状态信息之前， 还包括：
所述源宏基站向所述本地基站发送数据前转命令消息后， 接收所述本地基站发送的序 列号状态报告， 所述数据前转命令消息中携带有需要数据前转的承载标识、 UE 的标识、 转发隧道的传输层地址以及隧道端点标识 TEID。
4、 如权利要求 3 所述的方法， 其特征在于， 所述源宏基站向所述本地基站发送数据 前转命令消息后， 还包括：
所述本地基站停止对所述 UE的上下行数据的收发。
5、 如权利要求 2 所述的方法， 其特征在于， 所述源宏基站从所述本地基站发送的序 列号状态报告中获取所述序列号发送状态信息之前， 还包括：
所述源宏基站向所述本地基站发送切换指示消息后， 接收所述本地基站发送的序列号 状态报告。
6、如权利要求 5所述的方法，其特征在于，所述切换指示消息中包含所述 UE的标识。
7、 如权利要求 2所述的方法， 其特征在于， 所述源宏基站从本地保存的 PDCP数据 包中包含的未得到所述本地基站的成功发送确认指示的数据包中获得所述序列号发送状 态信息之前， 还包括：
所述源宏基站向所述本地基站发送切换指示消息。
8、 如权利要求 7 所述的方法， 其特征在于， 所述源宏基站向所述本地基站发送切换 指示消息之后， 还包括： 所述本地基站停止对所述 UE的上下行数据的收发。
9、 一种数据转发方法， 其特征在于， 包括：
本地基站接收源宏基站发送的用于指示用户设备 UE 切换至目标基站的切换指示消 息， 其中， 所述 UE的控制面连接至所述源宏基站， 用户面连接至所述本地基站；
所述本地基站将分组数据汇聚协议 PDCP数据包的成功发送确认状态信息发送给所述 源宏基站， 由所述源宏基站根据所述成功发送确认状态信息， 从本地保存的 PDCP数据包 中包含的未得到所述本地基站的成功发送确认指示的数据包中， 获得所述 UE 的上下行 PDCP数据包的序列号发送状态信息， 并发送给所述目标基站。
10、如权利要求 9所述的方法， 其特征在于， 所述本地基站接收所述切换指示消息后， 还包括：
所述本地基站停止对所述 UE的上下行数据的收发。
11、 一种数据转发方法， 其特征在于， 包括：
本地基站接收源宏基站发送的用于指示用户设备 UE切换至目标基站的切换指示消息 或数据前转命令消息， 其中， 所述 UE的控制面连接至所述源宏基站， 用户面连接至所述 本地基站；
所述本地基站向所述源宏基站发送序列号状态 ·ί艮告 , 由所述源宏基站从所述序列号状 态报告中获取所述 UE的上下行分组数据汇聚协议 PDCP数据包的序列号发送状态信息， 并发送给所述目标基站。
12、如权利要求 11所述的方法， 其特征在于， 所述数据前转命令消息中携带有需要数 据前转的承载标识、 所述 UE的标识、 转发隧道的传输层地址以及隧道端点标识 TEID。
13、如权利要求 11所述的方法， 其特征在于， 所述本地基站接收源宏基站发送的所述 切换指示消息或所述数据前转命令消息后， 还包括：
所述本地基站停止对所述 UE的上下行数据的收发。
14、 一种网络侧设备， 其特征在于， 包括：
获取单元， 用于获取用户设备 UE当前接入的本地基站的上下行方向 PDCP数据包的 序列号发送状态信息， 其中， 所述 UE的控制面连接至所述网络侧设备， 用户面连接至所 述本地基站；
处理单元， 用于将所述序列号发送状态信息发送给所述 UE待切换的目标基站， 由所 述目标基站根据所述序列号发送状态数据建立与所述 UE的用户面连接。
15、 如权利要求 14所述的网络侧设备， 其特征在于， 所述获取单元具体用于： 从所述本地基站发送的序列号状态报告中获取所述序列号发送状态信息；
或者，
从本地保存的 PDCP数据包中包含的未得到所述本地基站的成功发送确认指示的数据 包中获得所述序列号发送状态信息。
16、 如权利要求 15 所述的网络侧设备， 其特征在于， 所述获取单元还用于向所述本 地基站发送数据前转命令消息后， 接收所述本地基站发送的序列号状态报告。
17、 如权利要求 15 所述的网络侧设备， 其特征在于， 所述获取单元还用于向所述本 地基站发送切换指示消息后， 接收所述本地基站发送的序列号状态报告。
18、 如权利要求 15 所述的网络侧设备， 其特征在于， 所述获取单元还用于从本地保 存的 PDCP数据包中包含的未得到所述本地基站的成功发送确认指示的数据包中获得所述 序列号发送状态信息之前， 向所述本地基站发送切换指示消息。
19、 一种网络侧设备， 其特征在于， 包括：
接收单元， 用于接收源宏基站发送的用于指示用户设备 UE切换至目标基站的切换指 示消息， 其中， 所述 UE的控制面连接至所述源宏基站， 用户面连接至所述网络侧设备； 发送单元， 用于将分组数据汇聚协议 PDCP数据包的成功发送确认状态信息发送给所 述源宏基站， 由所述源宏基站根据所述成功发送确认状态信息， 从本地保存的 PDCP数据 包中包含的未得到所述本地基站的成功发送确认指示的数据包中， 获得所述 UE的上下行 PDCP数据包的序列号发送状态信息， 并发送给所述目标基站。
20、 如权利要求 19 所述的网络侧设备， 其特征在于， 所述接收单元还用于接收所述 切换指示消息后， 停止对所述 UE的上下行数据的收发。
21、 一种网络侧设备， 其特征在于， 包括：
接收单元， 用于接收源宏基站发送的用于指示用户设备 UE切换至目标基站的切换指 示消息或数据前转命令消息， 其中， 所述 UE的控制面连接至所述源宏基站， 用户面连接 至所述网络侧设备；
发送单元， 用于向所述源宏基站发送序列号状态报告 , 由所述源宏基站从所述序列号 状态报告中获取所述 UE的上下行分组数据汇聚协议 PDCP数据包的序列号发送状态信息， 并发送给所述目标基站。
22、 如权利要求 21 所述的网络侧设备， 其特征在于， 所述接收单元还用于接收源宏 基站发送的所述切换指示消息或所述数据前转命令消息后， 停止对所述 UE的上下行数据 的收发。
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