WO2015188357A1 - 一种控制承载切换的设备和控制方法 - Google Patents

一种控制承载切换的设备和控制方法 Download PDF

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Publication number
WO2015188357A1
WO2015188357A1 PCT/CN2014/079769 CN2014079769W WO2015188357A1 WO 2015188357 A1 WO2015188357 A1 WO 2015188357A1 CN 2014079769 W CN2014079769 W CN 2014079769W WO 2015188357 A1 WO2015188357 A1 WO 2015188357A1
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WO
WIPO (PCT)
Prior art keywords
bearer
needs
message
base station
switched
Prior art date
Application number
PCT/CN2014/079769
Other languages
English (en)
French (fr)
Inventor
时晓岩
张万强
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2014/079769 priority Critical patent/WO2015188357A1/zh
Priority to BR112016028954-4A priority patent/BR112016028954B1/pt
Priority to RU2017100454A priority patent/RU2667150C2/ru
Priority to MX2016016265A priority patent/MX362900B/es
Priority to EP14894317.8A priority patent/EP3145246B1/en
Priority to EP19191587.5A priority patent/EP3627900B1/en
Priority to CN201480037239.4A priority patent/CN105409285B/zh
Publication of WO2015188357A1 publication Critical patent/WO2015188357A1/zh
Priority to US15/376,214 priority patent/US10264501B2/en
Priority to US16/291,655 priority patent/US10660006B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters
    • H04W36/28—Reselection being triggered by specific parameters by agreed or negotiated communication parameters involving a plurality of connections, e.g. multi-call or multi-bearer connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H04W36/385—Reselection control by fixed network equipment of the core network

Definitions

  • the embodiments of the present invention relate to the field of communications, and in particular, to a device and a control method for controlling bearer switching.
  • Evolved Packet System The current Evolved Packet System (EPS) wireless network architecture is shown in Figure 1, where the main network entities function as follows: Evolved universal terrestrial radio access network (E-UTRAN) A network of multiple base stations (Evolved Node B, eNodeB, or eNB) implements wireless physical layer functions, resource scheduling and radio resource management, radio access control, and mobility management functions.
  • E-UTRAN Evolved universal terrestrial radio access network
  • eNodeB A network of multiple base stations (Evolved Node B, eNodeB, or eNB) implements wireless physical layer functions, resource scheduling and radio resource management, radio access control, and mobility management functions.
  • the eNodeB is connected to the S-GW through the user plane interface S 1 -U for transmitting user data.
  • the S1-AP is connected to the MME through the control plane interface, and the radio access bearer control function is implemented by using the S1-AP protocol.
  • the Mobility Management Entity is responsible for all control plane functions of user session management, including Non-Access-Stratified (NAS) signaling and security, and Tracking Area List. Management, selection of P-GW and S-GW, etc.
  • NAS Non-Access-Stratified
  • the serving gateway (S-GW, or SGW) is mainly responsible for data transmission, forwarding, and routing switching of user equipment (User Equipment, UE), and serves as a local mobility anchor point when the user equipment switches between eNodeBs. For each user equipment, there is only one S-GW serving each time.
  • PDN Gateway PDN Gateway, P_GW, or PGW
  • Packet Data Network Packet Data Network
  • PDN The anchor point of the connection, responsible for the IP address allocation of the user equipment, data packet filtering, rate control, and accounting information generation of the user equipment.
  • the user equipment accesses the EPS network and creates a PDN connection through the attaching process.
  • the PGW allocates a PDN address to the user equipment, and the user equipment connects to the external network through the PGW through the PDN address connection.
  • the UE can apply for an additional PDN connection to obtain an additional PDN address.
  • the specific process is similar to the attach process.
  • the UE can use the dual connectivity feature to increase the transmission rate between the UE and the base station. That is, the UE is simultaneously connected to two eNBs, and multiple bearers are transmitted on different eNBs.
  • the traditional bearer process does not have special control for dual connectivity.
  • the corresponding network side device When the first eNB transfers a part of the bearer of the UE to the second eNB, the corresponding network side device does not know the process of its dual connection, and thus still uses the traditional bearer for single connection to process. Obviously, this kind of processing for single connection is used in the dual-connected bearer, which cannot meet the processing requirements of the dual connection, which may cause communication abnormality. Summary of the invention
  • the embodiments of the present invention provide a device and a control method for controlling bearer switching, which can solve the problem of bearer loss in a multi-connection scenario.
  • An embodiment of the present invention provides a network side device, which is used to control bearer switching, where the network side device belongs to a wireless communication system, and the system further includes a source base station and a target base station, and all between the user equipment and the source base station. At least a part of the bearer needs to be handed over from the source base station to the target base station, where the network side device includes: a receiving unit, configured to receive a bearer switching message, and a processing unit, configured to determine, according to the bearer switching message, all the bearers The bearer that needs to be switched is such that the end marker End Marker message is sent to the source base station only for the bearer that needs to be handed over.
  • the network side device is a serving gateway SGW, where the receiving unit is configured to receive a bearer switching message
  • the receiving unit of the SGW is configured to receive at least one modification sent by the mobility management entity MME. a bearer request message, where the bearer context included in the at least one modified bearer request message corresponds to the bearer
  • the processing unit is configured to determine, according to the bearer switching message, a bearer that needs to be switched in all bearers, so that only And the sending, by the SGW, the processing unit, configured to determine, according to the bearer context in the at least one modified bearer request message, the bearer that needs to be switched, where the bearer that needs to be handed over sends the end tag End Marker message to the source base station
  • the SGW further includes a sending unit, configured to send the End Marker message to the source base station only for the bearer that needs to be handed over.
  • the processing unit of the SGW is configured to determine, according to the bearer context in the at least one modified bearer request message, the bearer that needs to be handed over, and the method includes: performing, by using, the bearer context in the at least one modified bearer request message
  • the Fulfilled Qualified Tunnel End Point Identifier (F-TEID) matches the F-TEID in the bearer context of the current self-contained bearer.
  • F-TEID Fulfilled Qualified Tunnel End Point Identifier
  • the base station address in the bearer context of the at least one modified bearer request message is matched with the base station address in the bearer context currently stored by itself, and when the bearer address of a bearer changes, the bearer is determined. For the bearer that needs to be switched.
  • the network side device is a serving gateway SGW, where the receiving unit is configured to receive a bearer switching message, where: the receiving unit of the SGW is configured to receive at least one modification sent by the mobility management entity MME. a bearer request message, where the modify bearer request message includes first indication information, where the first indication information indicates a bearer that needs to be handed over; and the processing unit is configured to determine, according to the bearer switching message, that the bearer needs to be switched according to the bearer switching message.
  • the bearer is configured to send the end marker End Marker message to the source base station only for the bearer that needs to be handed over, including: the processing unit of the SGW, configured to determine, according to the first indication information in the at least one modified bearer request message, The bearer that needs to be handed over; the SGW further includes a sending unit, configured to send the End Marker message to the source base station only for the bearer that needs to be handed over.
  • each modified bearer request message of the at least one modified bearer request message includes a first indication information, where the first indication information indicates that all bearers in the modified bearer request are bearers that need to be switched, or
  • Each of the modified bearer request messages includes a plurality of first indication information, where each bearer in the modified bearer request corresponds to a first indication information, and each indication information indicates whether the corresponding bearer is Need to switch.
  • the processing unit of the SGW is further configured to reserve a bearer context that does not need to be switched.
  • the network side device is a mobility management entity MME, where: the receiving unit is used by Receiving a bearer switching message, including: receiving, by the MME, a receiving, by the source base station, an evolved universal land-based radio access network radio access bearer E-RAB modification indication message; the E-RAB modification
  • the bearer context included in the indication message corresponds to all the bearers
  • the processing unit is configured to determine, according to the bearer handover message, all bearers that need to be handed over in the bearer, so that the bearer that needs to be handed over only sends the end to the source base station.
  • a processing unit configured to determine, according to the bearer context in the E-RAB modification indication message, a bearer that needs to be handed over; the MME further includes a sending unit, configured to send, to the SGW, a modified bearer.
  • the request message, the bearer context carried in the modify bearer request message includes only the bearer context of the bearer that needs to be handed over.
  • the processing unit of the MME is configured to determine, according to the bearer context in the E-RAB modification indication message, the bearer that needs to be handed over, and the method includes: used to modify all bearers in the E-RAB modification indication message
  • the F-TEID in the bearer context matches the F-TEID of the currently stored bearer context.
  • the bearer is determined to be a bearer that needs to be switched; or is used to modify the E-RAB.
  • the base station address in the bearer context of all bearers in the indication message matches the base station address in the bearer context currently stored in the bearer.
  • the bearer address of a bearer changes, the bearer is determined to be a bearer that needs to be handed over.
  • the network side device is a mobility management entity MME, where: the receiving unit is configured to receive a bearer switching message, where: the receiving unit of the MME is configured to receive an E- sent by the source base station The RAB modification indication message; the E-RAB modification indication message includes second indication information, where the second indication information indicates a bearer that needs to be handed over; the processing unit is configured to determine, according to the bearer switching message, all the bearers. The bearer that needs to be switched, so that the end marker End Marker message is sent to the source base station only for the bearer that needs to be handed over, including: the processing unit of the MME, configured to perform the second according to the E-RAB modification indication message.
  • the receiving unit is configured to receive a bearer switching message
  • the receiving unit of the MME is configured to receive an E- sent by the source base station The RAB modification indication message
  • the E-RAB modification indication message includes second indication information, where the second indication information indicates a bearer that needs to be handed over
  • the processing unit is configured to
  • the indication information is used to determine the bearer that needs to be handed over;
  • the MME further includes a sending unit, configured to send, to the SGW, at least one modify bearer request message, where the bearer context carried in the at least one modified bearer request message includes only the required handover Bearer context, or at least one of
  • the modify bearer request message includes first indication information, where the first indication information indicates a bearer that needs to be handed over.
  • the E-RAB modification indication message includes a second indication information, where the second indication information indicates that all bearers in the E-RAB modification indication message are bearers that need to be switched, or the E-RAB
  • the modification indication message includes a plurality of second indication information, where each bearer in the E-RAB modification indication message corresponds to a second indication information, and each indication information indicates whether the corresponding bearer needs to be switched.
  • each modified bearer request message of the at least one modified bearer request message includes a first indication information, where the first indication information indicates that all bearers in the modified bearer request are bearers that need to be switched, or
  • Each of the modified bearer request messages includes a plurality of first indication information, where each bearer in the modified bearer request corresponds to a first indication information, and each indication information indicates whether the corresponding bearer is Need to switch.
  • Embodiments of the present invention provide a control method for bearer switching.
  • the method is applicable to a wireless communication system, where the system includes a network side device, a source base station, and a target base station, and at least a part of all bearers between the user equipment and the source base station needs to be handed over from the source base station to the target base station.
  • the method includes the following steps: the network side device receives a bearer switching message; the network side device determines, according to the bearer switching message, the bearer that needs to be switched in all bearers, so that only the bearer that needs to be switched is used
  • the source base station sends an end marker End Marker message.
  • the network side device is a serving gateway SGW, where the network side device receives the bearer switching message, where the: the SGW receives the at least one modified bearer request message sent by the mobility management entity MME, where the at least one The bearer context included in the modify bearer request message corresponds to all the bearers; the network side device determines, according to the bearer handover message, the bearer that needs to be switched in all the bearers, so that the bearer only needs to be switched to the source base station.
  • the sending an end tag End Marker message includes: the SGW determining, according to the bearer context in the at least one modified bearer request message, a bearer that needs to be handed over; the SGW sending the End to the source base station only for the bearer that needs to be handed over Marker news.
  • the SGW is And determining, by the SGW, the F-TEID in the bearer context of the at least one modified bearer request message and the F-TEID in the bearer context currently stored by the SGW, when the F-TEID of the bearer is matched
  • the bearer is determined to be a bearer that needs to be handed over; or the SGW matches the base station address in the bearer context in the at least one modified bearer request message with the base station address in the bearer context currently stored by itself, when When the bearer address of the bearer changes, it is determined that the bearer is a bearer that needs to be switched.
  • the network side device is a serving gateway SGW, where the network side device receives the bearer switching message, and the method includes: the SGW receiving the at least one modified bearer request message sent by the mobility management entity MME, where the modified bearer
  • the request message includes first indication information, where the first indication information indicates a bearer that needs to be handed over; and the network side device determines, according to the bearer switching message, the bearer that needs to be switched in all the bearers, so that the bearer only needs to be switched.
  • the source base station sends the End M&rker message.
  • each modified bearer request message of the at least one modified bearer request message includes a first indication information, where the first indication information indicates that all bearers in the modified bearer request are bearers that need to be switched, or
  • Each of the modified bearer request messages of the at least one modified bearer request message includes a plurality of first indication information, where each bearer in the modified bearer request corresponds to a first indication information, and each first indication information indication corresponds to Whether the bearer needs to be switched.
  • control method further includes: the SGW retains a bearer context that does not need to be switched.
  • the network side device is a mobility management entity MME, where: the network side device receives the bearer switching message, and the method includes: the MME receiving the evolved universal land-based radio access network wirelessly sent by the source base station Accessing an E-RAB modification indication message; the E-RAB modification indication message includes a bearer And the network side device is configured to determine, according to the bearer switching message, the bearer that needs to be switched in all the bearers, so that the end marker End Marker message is sent to the source base station only for the bearer that needs to be handed over, including: Determining, by the MME, the bearer that needs to be handed over according to the bearer context in the E-RAB modification indication message; the MME sends a modify bearer request message to the SGW, where the bearer context carried in the modify bearer request message includes only the need The bearer context of the switch.
  • the network side device receives the bearer switching message, and the method includes: the MME receiving the evolved universal land-based radio access network wirelessly sent by the source base
  • the determining, by the MME, the bearer that needs to be handed over according to the bearer context in the E-RAB modification indication message including: the MME, in the bearer context of all bearers in the E-RAB modification indication message -
  • the TEID matches the F-TEID of the currently stored bearer context.
  • the bearer's F-TEID changes the bearer is determined to be the bearer to be handed over; or the MME will modify the E-RAB in the indication message.
  • the target base station address in the bearer context of all bearers matches the base station address in the bearer context currently stored in the bearer.
  • the bearer address of a bearer changes, the bearer is determined to be the bearer to be handed over.
  • the network side device is a mobility management entity MME, where: the network side device receives a bearer switching message, and the method includes: the MME receiving an E-RAB modification indication message sent by the source base station;
  • the RAB modification indication message includes the second indication information, where the second indication information indicates the bearer that needs to be handed over; the network side device determines, according to the bearer switching message, the bearer that needs to be switched in all the bearers, so that only the The bearer that needs to be handed over sends the end marker End Marker message to the source base station, where the MME determines, according to the second indication information in the E-RAB modification indication message, the bearer that needs to be handed over; the MME sends at least the SGW to the SGW.
  • the bearer context carried in the at least one modify bearer request message includes only the bearer context that needs to be switched, or the at least one modify bearer request message includes first indication information, and the first indication information Indicates the bearer that needs to be switched.
  • the E-RAB modification indication message includes a second indication information, where the indication information indicates that all bearers in the E-RAB modification indication message are bearers that need to be switched, or the E-RAB modification indication
  • the message includes a plurality of second indication information, where each E-RAB modification indicates a bearer pair in the message There should be a second indication information, and each indication information indicates whether the corresponding bearer needs to be switched.
  • each modify bearer request message of the modify bearer request message includes a first indication information, where the first indication information indicates that all bearers in the modify bearer request are bearers that need to be switched, or the at least
  • Each of the modified bearer request messages includes a plurality of first indication information, where each bearer in the modified bearer request corresponds to a first indication information, and each first indication information indicates whether the corresponding bearer is Need to switch.
  • the network-side device can determine the bearer that needs to be handed over, so that the end-mark message is sent only to the bearer that needs to be handed over, and the subsequent data of the non-handover bearer can be discarded, thereby ensuring the UE and the base station. Multiple connections between each other, thereby improving the stability of the system.
  • FIG. 1 is a schematic diagram of a wireless network architecture in the prior art
  • FIG. 2 is a schematic diagram of a UE establishing a bearer through an attach procedure
  • Figure 3 is a schematic diagram of switching for a single connection bearer
  • FIG. 4 is a block diagram of a network side device according to a first embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a technical solution for controlling bearer switching according to a second embodiment of the present invention.
  • Figure 6 is a block diagram of an SGW of a second embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a technical solution for controlling bearer switching according to a third embodiment of the present invention.
  • FIG. 8 is a block diagram of an MME according to a third embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a method for controlling bearer switching according to a fourth embodiment of the present invention.
  • 10 is a schematic diagram of a method for controlling bearer switching according to a fifth embodiment of the present invention
  • FIG. 11 is a schematic diagram of a method for controlling bearer switching according to a sixth embodiment of the present invention.
  • Figure 12 is a block diagram of a network side device of a ninth embodiment of the present invention.
  • Figure 13 is a block diagram of an SGW of a tenth embodiment of the present invention.
  • Figure 14 is a block diagram of an MME according to an eleventh embodiment of the present invention.
  • the base station mentioned in the present invention may be a base station of a Long Term Evolution (LTE) system, a base station of a Universal Mobile Telecommunications System (UMTS) system, or a base station of other systems,
  • LTE Long Term Evolution
  • UMTS Universal Mobile Telecommunications System
  • the invention is not limited.
  • FIG. 2 shows a communication system including entities such as a source base station, a target base station, and user equipment.
  • entities such as a source base station, a target base station, and user equipment.
  • HSS Home Subscriber Server
  • Step 201 The UE sends an attach request to the MME by using the eNB.
  • Step 202 The MME sends the selected SGW and the PGW, and sends a create session request to the SGW.
  • Step 203 The SGW creates default bearer context information and creates a session request to the PGW.
  • Step 204 The PGW creates default bearer context information, and creates a session response message to the SGW.
  • Step 206 The MME sends an attach accept message to the eNB.
  • Step 207 The eNB completes an attach procedure with the UE by using an RRC connection reconfiguration message.
  • each entity that the bearer passes through can save the bearer context and related information, and record them in the memory of the corresponding entity.
  • the UE After the bearer is successfully established, the UE establishes at least one bearer with the PGW.
  • the SGW stores the bearer context of all bearers corresponding to the UE. Specifically, there is one PDN connection between one UE and one PGW; one UE can establish multiple PDN connections with multiple PGWs.
  • a communication system includes a source base station, a target base station, and a user equipment, and at least a part of all bearers between the user equipment and the source base station needs to be handed over from the source base station to the target base station.
  • the implementation process can be as follows.
  • Step 301 The first eNB (Master eNB in FIG. 3) initiates a second eNB modification procedure, and transmits a bearer context of those bearers that need to be switched to the second eNB to the second eNB.
  • the bearer context includes information such as an identifier, a QoS, an address of the uplink data, and a TEID;
  • Step 302 The first eNodeB sends an E-RAB modification indication message to the MME, where the message carries the bearer context of all bearers of the user equipment, including the eNB address and TEID information corresponding to each bearer, where those that need to be handed over to the second eNB Carrying the bearer context of the bearer carrying the address and TEID of the second eNB, and carrying the original eNB and the TEID in the bearer context of the bearer that does not need to be handed over;
  • Step 303 The MME sends a modify bearer request message to the SGW, where the message carries a bearer context, where the bearer context includes the bearer corresponding eNB address and TEID information.
  • Step 304 The SGW returns a modify bearer response message to the MME.
  • Step 305 The MME sends an E-RAB modification confirmation message to the first eNB.
  • Step 306 After the SGW, the SGW sends an End marker message to the first eNB to all the bearers on the old path, and the SGW updates the eNB address and the TEID corresponding to all the bearers according to the modify bearer request message.
  • the first eNB receives the End. After the marker message, the corresponding bearer is forwarded to the second eNB. The first eNB forwards the end markers of these bearers to the second eNB. Because these End marker messages correspond to all bearers, after receiving the End Marker, the first eNB stops accepting all the corresponding bearers. Continued message. This causes the first eNB to discard the subsequent downlink data of the non-handover bearer, resulting in interruption of the user service, and the second eNB does not expect to accept the bearer that does not need to be handed over, causing service conflicts.
  • the embodiment of the present invention provides a corresponding implementation scheme for controlling bearer switching. These implementations are described in detail below.
  • an embodiment of the present invention provides a network side device for controlling bearer switching.
  • the network side device belongs to a wireless communication system, the system further includes a source base station and a target base station, and at least a part of all bearers between the user equipment and the source base station needs to be handed over from the source base station to the target base station, where
  • the network side device 400 includes:
  • the receiving unit 403 is configured to receive a bearer switching message.
  • the processing unit 401 is configured to determine, according to the bearer switching message, a bearer that needs to be switched in all bearers, so that an end marker End Marker message is sent to the source base station only for a bearer that needs to be handed over.
  • the network-side device can determine the bearer that needs to be handed over, so that the end-mark message is sent only to the bearer that needs to be handed over, and the subsequent data of the non-handover bearer can be discarded, thereby ensuring the UE and the base station. Multiple connections between each other, thereby improving the stability of the system.
  • the network side device in this embodiment may be a serving gateway SGW or a mobility management entity MME, which is specifically described below.
  • This embodiment describes a technical solution in which the network side device is an SGW.
  • This embodiment provides a technical solution, in which the UE maintains communication with the source base station, and prepares to switch a part of the bearer to the target base station according to the condition of the bearer. Specifically, as shown in FIG. 5, the solution may include the following steps:
  • Step 501 The source base station may determine, by using parameters such as a Qos of the UE or the source base station or a load condition between the base stations, a bearer that needs to be switched. These bearers that need to be switched can be one bearer or multiple bearers.
  • Step 502 The source eNB sends an E-RAB modification indication message to the MME to the MME, where the E-RAB modification indication message includes the bearer context corresponding to all the bearers, and the MME sends at least one modification according to the E-RAB modification indication message.
  • the bearer request message is sent to the SGW, and the bearer context included in the at least one modified bearer request message corresponds to all the bearers.
  • the at least one modify bearer request message sent by the MME may include multiple pieces of modify bearer request messages.
  • Each of the modified bearer request messages corresponds to a PDN connection
  • the bearer corresponding to the context included in each of the modify bearer request messages corresponds to the PDN connection corresponding to the modify bearer request message, and all the modified bearer request messages are included in the message.
  • the context corresponds to all of the bearers described.
  • Step 503 The SGW may receive the at least one modified bearer request message sent by the mobility management entity MME, where the bearer context included in the at least one modified bearer request message corresponds to all the bearers, and the SGW may be according to the at least one Modify the bearer context in the bearer request message to determine the bearer that needs to be switched.
  • the SGW may send a modify bearer response message to the MME, and the MME may send an E-RAB modification acknowledgement message to the source base station, and details are not described herein.
  • Step 504 The SGW may send the End M&rker message to the source base station only for the bearer that needs to be handed over.
  • Step 505 After receiving the End Marker message, the source base station may forward the received End Marker message to the target base station.
  • the End Marker message received by the source base station only corresponds to a bearer that needs to be switched, and does not include a bearer that does not need to be switched.
  • the source base station retains the bearer that does not need to be handed over, and stops subsequent packets of the bearer that needs to be handed over.
  • the source base station transfers the bearer that needs to be handed over to the target base station.
  • the source base station may also forward the received End Marker message to the target base station.
  • the target base station may confirm that the data stream of the bearer that needs to be handed over has been sent by the source base station, and start the target base station and the corresponding UE and the network. Communication of the network side device.
  • the SGW 600 may include: a receiving unit 603, configured to receive at least one modified bearer request message sent by the mobility management entity MME, where the at least one modified bearer request message includes a bearer context Corresponding to all the bearers;
  • the processing unit 601 is configured to determine, according to the bearer context in the at least one modified bearer request message, a bearer that needs to be switched;
  • the sending unit 602 is configured to send the End Marker message to the source base station only for the bearer that needs to be handed over.
  • the End Marker message is sent only to the bearer that needs to be handed over, and the End Marker message is sent to the bearer that needs to be handed over, and the End Marker message is not sent to the bearer that does not need to be handed over.
  • the bearer refers to a transmission channel between the user equipment and the PGW.
  • the transmission channel includes an entity such as a user equipment, a base station, an MME, an SGW, a PGW, and the like.
  • the SGW sends the End Marker message, in order to prevent the End Marker from being lost, at least one End Marker may be sent for each bearer.
  • the SGW can determine the bearer that needs to be handed over for the scenario of the multi-connection, so that the SGW sends the end tag message only to the bearer that needs to be handed over, and can prevent the subsequent data of the non-handover bearer from being discarded, thereby ensuring the UE and the base station.
  • Multiple connections which in turn improve the stability of the system.
  • the bearer context included in the at least one modification bearer request message includes an F-TEID.
  • Each bearer context corresponds to an F-TEID.
  • the SGW matches the received F-TEID of the bearer context with the F-TEID in the corresponding bearer context obtained when the bearer is established.
  • F-TEID typically includes base station address and TEID information.
  • the SGW can also obtain a bearer that needs to be handed over by matching only the change of the base station address.
  • the SGW can also obtain the bearer that needs to be switched by matching the change of the base station address and the TEID information.
  • the processing unit of the SGW is configured to determine, according to the bearer context in the at least one modified bearer request message, the bearer that needs to be handed over, and is configured to: in the bearer context in the at least one modified bearer request message
  • the F-TEID matches the F-TEID in the bearer context of the current self-storage. When the bearer's F-TEID changes, it is determined that the bearer is a bearer that needs to be switched; or
  • the base station address in the bearer context of the at least one modified bearer request message is matched with the base station address in the bearer context that is currently stored by itself, and when the bearer address of the bearer changes, determining that the bearer needs to be switched Hosted.
  • processing unit of the SGW is further configured to reserve a bearer context that does not need to be switched. In this way, the SGW can maintain normal communication of the original bearer.
  • the above solution can determine the bearer that needs to be switched by matching the F-TEID or the change of the base station address, so as to facilitate the subsequent transmission of the corresponding End Marker only for the bearer that needs to be switched. This solution does not need to add additional signaling, saving the letter. Make resources.
  • the SGW may obtain a bearer that needs to be switched without matching the F-TEID or the change of the base station address.
  • the SGW may indicate the bearer that needs to be handed over by the indication information.
  • the source base station may include the second indication information in the E-RAB modification indication message sent to the MME, where the second indication information indicates the bearer that needs to be switched.
  • the MME generates, according to the foregoing E-RAB modification indication message and the corresponding second indication information, at least one modification bearer request message, where the modify bearer request message includes first indication information, where the first indication information indicates a bearer that needs to be switched.
  • the MME sends the at least one modified bearer request message to the SGW.
  • the SGW may receive the at least one modified bearer request message sent by the mobility management entity MME, where the modify bearer request message includes first indication information, the first indication information indicates a bearer that needs to be switched, and the bearer request message is modified according to the at least one The first indication information in the determining the bearer that needs to be switched; sending the End Marker message to the source base station only for the bearer that needs to be handed over.
  • the process of the source base station and the target base station is consistent with the foregoing scheme of matching the F-TEID or the base station address, and details are not described herein again.
  • the receiving unit configured to receive a bearer switching message, includes: a receiving unit, configured to receive at least one modified bearer request message sent by the mobility management entity MME, where the modify bearer request message includes first indication information, where The first indication information indicates a bearer that needs to be switched;
  • a processing unit configured to determine, according to the first indication information in the at least one modified bearer request message, a bearer that needs to be switched;
  • a sending unit configured to send the End Marker message to the source base station only for a bearer that needs to be handed over.
  • the SGW may not be required to perform another matching action, which saves computing resources.
  • the MME notifies the SGW that the first indication information in the modify bearer request message may take a different granularity, including: a modify bearer request message includes a first indication information, where the first indication information indicates in the modify bearer request Each bearer that is required to be handed over; or each of the at least one modified bearer request message includes a plurality of first indication information, where each bearer in the modified bearer request corresponds to a first indication information, Each indication information indicates whether the corresponding bearer needs to be switched. Both of the above solutions can indicate the bearer that needs to be switched.
  • the first scheme uses one indication information to indicate multiple bearers, which can save signaling; the second scheme can accurately indicate whether each bearer needs to be switched, and the indication is more accurate.
  • processing unit of the SGW is further configured to reserve a bearer context that does not need to be switched. In this way, the SGW can maintain normal communication of the original bearer.
  • This embodiment describes a technical solution in which the network side device is an MME.
  • the illustrated solution may include the following steps:
  • Step 701 The source base station determines a bearer that needs to be handed over, and sends an E-RAB modification indication message to the MME.
  • the bearer context included in the E-RAB modification indication message corresponds to all bearers.
  • Step 702 The MME determines, according to the bearer context in the E-RAB modification indication message, a bearer that needs to be switched.
  • Step 703 The MME sends a modify bearer request message to the SGW, where the bearer context carried in the modify bearer request message includes only the bearer context that needs to be switched.
  • Step 704 The SGW sends the End Marker message to the source base station only for the bearer that needs to be handed over according to the bearer context carried in the received modify bearer request message.
  • the MME stores the bearer context of all bearers.
  • the SGW does not delete the context of the bearer that is not included in the modify bearer request message sent by the MME, and retains the part of the bearer as a bearer that does not need to be switched.
  • the MME 800 may include:
  • the receiving unit 803 is configured to receive an E-RAB modification indication message sent by the source base station, where the bearer context included in the E-RAB modification indication message corresponds to all the bearers.
  • the processing unit 801 is configured to determine, according to the bearer context in the E-RAB modification indication message, a bearer that needs to be switched;
  • the sending unit 802 is configured to send a modify bearer request message to the SGW, where the bearer context carried in the modify bearer request message includes only the bearer context of the bearer that needs to be handed over.
  • the receiving unit of the SGW is configured to receive a modify bearer request message, where the modify bearer request message indicates a bearer that needs to be handed over and a context of a bearer that needs to be switched;
  • a processing unit of the SGW configured to generate an End Marker message for the bearer that needs to be switched according to the modify bearer request message
  • the sending unit of the SGW sends an End Marker message to the bearer that needs to be handed over.
  • the processing unit of the SGW is further configured to reserve a bearer context that does not need to be switched.
  • the MME can determine the bearer that needs to be handed over for the multi-connection scenario, so that the SGW can only send the end tag message to the bearer that needs to be handed over, and can prevent the subsequent data of the non-handover bearer from being discarded, thereby ensuring the UE and the base station. Multiple connections between each other, thereby improving the stability of the system.
  • the bearer context included in the E-RAB modification indication message includes an F-TEID.
  • the MME matches the received F-TEID of the bearer context with the F-TEID in the corresponding bearer context obtained when the bearer is established.
  • F-TEID F-TEID
  • the MME may obtain a corresponding bearer context when the bearer is established, and is saved in a memory in the MME. Similar to the second embodiment, the MME can also obtain a bearer that needs to be handed over by matching only the change of the base station address. The MME can also obtain the bearer that needs to be switched by matching the change of the base station address and the TEID information.
  • the processing unit of the MME is configured to determine, according to the bearer context in the E-RAB modification indication message, a bearer that needs to be handed over, and includes: a bearer used to modify all bearers in the E-RAB modification indication message
  • the F-TEID in the context matches the F-TEID of the currently stored bearer context.
  • the bearer is determined to be a bearer that needs to be switched; or
  • the base station address in the bearer context of all bearers in the E-RAB modification indication message is matched with the base station address in the bearer context currently stored in the bearer, and when the bearer address of a bearer changes, the bearer is determined to be The bearer that needs to be switched.
  • the bearer that needs to be switched can be determined, and the multi-connection scenario requirement can be satisfied without adding additional signaling.
  • the MME may obtain a bearer that needs to be switched without matching the F-TEID or the change of the base station address.
  • the MME may indicate the bearer that needs to be switched by using the indication information.
  • the source base station may include the second indication information in the E-RAB modification indication message sent to the MME, where the second indication information indicates the bearer that needs to be switched.
  • the MME to the SGW Sending at least one modify bearer request message, the bearer context carried in the at least one modify bearer request message includes only the bearer context that needs to be switched, or the at least one modify bearer request message includes first indication information, where the first The indication information indicates the bearer that needs to be switched.
  • the SGW may receive the at least one modified bearer request message sent by the mobility management entity MME, and send the End Marker message to the source base station only for the bearer that needs to be handed over. The process of the source base station and the target base station is consistent with the foregoing scheme of matching the F-TEID or the base station address, and details are not described herein again.
  • the receiving unit of the MME is configured to receive a bearer switching message, and includes:
  • a receiving unit configured to receive an E-RAB modification indication message sent by the source base station;
  • the E-RAB modification indication message includes second indication information, where the second indication information indicates a bearer that needs to be switched;
  • the processing unit is configured to determine, according to the bearer switching message, the bearer that needs to be switched in all the bearers, so that the end marker End Marker message is sent to the source base station only for the bearer that needs to be handed over, including:
  • a processing unit configured to determine, according to the second indication information in the E-RAB modification indication message, a bearer that needs to be switched;
  • a sending unit configured to send, to the SGW, at least one modify bearer request message, where the bearer context carried in the at least one modified bearer request message includes only the bearer context that needs to be switched, or the at least one modified bearer request message includes An indication message indicating the bearer that needs to be handed over.
  • the MME By adding the second indication information to the E-RAB modification indication message to determine the bearer that needs to be switched, the MME is not required to perform another matching action, which saves computing resources.
  • the source station indicates that the second indication information in the E-RAB modification indication message of the MME may take a different granularity, including: the E-RAB modification indication message includes a second indication information, where the second The indication information indicates that all bearers in the E-RAB modification indication message are bearers that need to be handed over, or the E-RAB modification indication message includes multiple second indication information, where the E-RAB modification indication is cancelled.
  • Each bearer in the information corresponds to a second indication information, and each indication information indicates whether the corresponding bearer needs to be switched. Both of the above solutions can indicate the bearer that needs to be switched.
  • the first scheme uses one indication information to indicate multiple bearers, which can save signaling.
  • the second scheme can accurately indicate whether each bearer needs to be switched, and the indication is more accurate.
  • the MME notifies the SGW that the first indication information in the Modify Bearer Request message can also take a different granularity.
  • the modify bearer request message includes a first indication information, and the first indication information indicates that all bearers in the modify bearer request are required to be switched.
  • Each bearer, or the at least one modified bearer request message includes a plurality of first indication information, where each bearer in the modify bearer request corresponds to a first indication information, and each indication information indicates Whether the corresponding bearer needs to be switched.
  • Embodiments of the present invention provide a control method for bearer switching.
  • the method is applicable to a wireless communication system, where the system includes a network side device, a source base station, a target base station, and a user equipment, and at least a part of all bearers between the user equipment and the source base station needs to be switched from the source base station. Go to the target base station.
  • the method includes the following steps:
  • the network side device receives a bearer switching message.
  • the network side device determines, according to the bearer switching message, a bearer that needs to be switched in all bearers, so that an end marker End Marker message is sent to the source base station only for a bearer that needs to be handed over.
  • the network-side device can determine the bearer that needs to be handed over, so that the end-mark message is sent only to the bearer that needs to be handed over, and the subsequent data of the non-handover bearer can be discarded, thereby ensuring the UE and the base station. Multiple connections between each other, thereby improving the stability of the system.
  • This embodiment describes a method for controlling the network side device as an SGW.
  • the network side device is a serving gateway SGW, including,
  • the SGW receives the at least one modified bearer request message sent by the mobility management entity MME, where the bearer context included in the at least one modified bearer request message corresponds to all bearers;
  • the SGW determines, according to the bearer context in the at least one modified bearer request message, a bearer that needs to be switched.
  • the SGW sends the End Marker message to the source base station only for a bearer that needs to be handed over.
  • the SGW can determine the bearer that needs to be handed over for the multi-connection scenario, so that the end tag message is sent only to the bearer that needs to be handed over, and the subsequent data of the non-handover bearer can be discarded, thereby ensuring the between the UE and the base station. Multiple connections, which in turn improve the stability of the system.
  • the bearer context included in the at least one modification bearer request message includes an F-TEID. See the second embodiment for the specific principle.
  • the SGW determines, according to the bearer context in the at least one modified bearer request message, the bearer that needs to be switched, including:
  • the SGW matches the F-TEID in the bearer context of the at least one modified bearer request message with the F-TEID in the bearer context currently stored by the SGW, and determines the bearer when the F-TEID of the bearer changes. For the bearer that needs to be switched; or
  • the SGW matches the base station address in the bearer context of the at least one modified bearer request message with the base station address in the bearer context currently stored by the SGW, and determines that the bearer needs to be switched when the bearer address of the bearer changes. Hosting.
  • the SGW may reserve a bearer context that does not need to be handed over. In this way, the SGW can maintain the normal communication of the original bearer.
  • the bearer that needs to be switched can be determined, and the multi-connection scenario requirement can be satisfied without adding additional signaling.
  • the SGW may obtain a bearer that needs to be switched without matching the F-TEID or the change of the base station address.
  • the SGW may indicate the bearer that needs to be switched by using the indication information. The specific principle is described in the second embodiment.
  • the network side device is a serving gateway SGW, where the network side device receives the bearer switching message, and includes:
  • the SGW receives the at least one modified bearer request message sent by the mobility management entity MME, where the modify bearer request message includes first indication information, where the first indication information indicates a bearer that needs to be handed over;
  • the bearer switching message is used to determine the bearer that needs to be switched in all the bearers, so that the end marker End Marker message is sent to the source base station only for the bearer that needs to be handed over, including:
  • the SGW sends the End Marker message to the source base station only for the bearer that needs to be handed over. By adding the first indication information to the modify bearer request message to determine the bearer that needs to be switched, the SGW may not be required to perform another matching action, which saves computing resources.
  • the MME may notify the SGW that the first indication information in the modify bearer request message may take a different granularity, including: a modify bearer request message includes a first indication information, where the first indication information indicates all bearers in the modify bearer request.
  • Each of the modified bearer request messages of the at least one modified bearer request message includes a plurality of first indication information, where each bearer in the modified bearer request corresponds to a first indication information, each The indication information indicates whether the corresponding bearer needs to be switched.
  • Both of the above solutions can indicate the bearer that needs to be switched.
  • the first scheme uses one indication information to indicate multiple bearers, which can save signaling; the second scheme can accurately indicate whether each bearer needs to be used. To switch, the indication is more accurate.
  • the SGW may reserve a bearer context that does not need to be switched. In this way, the SGW can maintain the normal communication of the original bearer.
  • This embodiment describes a method for controlling the network side device as an MME.
  • the MME stores the bearer context of all bearers.
  • the SGW does not delete the context of the bearer that is not included in the modify bearer request message sent by the MME, and retains the part of the bearer as a bearer that does not need to be switched.
  • the network side device is a mobility management entity MME, and includes:
  • the MME receives an E-RAB modification indication message sent by the source base station, and the bearer context included in the E-RAB modification indication message corresponds to all the bearers.
  • the MME determines, according to the bearer context in the E-RAB modification indication message, a bearer that needs to be switched.
  • the MME sends a modify bearer request message to the SGW, where the bearer context carried in the modify bearer request message includes only the bearer context that needs to be switched.
  • control method of the SGW is:
  • the method for controlling the SGW further includes: the SGW retains a bearer context that does not need to be switched.
  • the MME can determine the bearer that needs to be handed over for the multi-connection scenario, so that the SGW can only send the end tag message to the bearer that needs to be handed over, and can prevent the subsequent data of the non-handover bearer from being discarded, thereby ensuring the UE and the base station. Multiple connections between each other, thereby improving the stability of the system.
  • the bearer context included in the E-RAB modification indication message includes an F-TEID. See the third embodiment for the specific principle.
  • the MME determines, according to the bearer context in the E-RAB modification indication message, the bearer that needs to be switched, including:
  • the MME matches the F-TEID in the bearer context of all the bearers in the E-RAB modification indication message with the F-TEID of the currently stored bearer context, and when the F-TEID of the bearer changes, determining the The bearer is a bearer that needs to be switched; or
  • the MME matches the target base station address in the bearer context of all bearers in the E-RAB modification indication message with the base station address in the bearer context currently stored by itself, and determines when the base station address of a bearer changes.
  • the bearer is a bearer that needs to be switched.
  • the bearer that needs to be switched can be determined, and the multi-connection scenario requirement can be satisfied without adding additional signaling.
  • the MME may obtain a bearer that needs to be switched without matching the F-TEID or the change of the base station address.
  • the MME may indicate the bearer that needs to be handed over by the indication information.
  • the specific principle is shown in the third embodiment.
  • the network side device is a mobility management entity MME, where:
  • the method includes: the MME receiving an E-RAB modification indication message sent by the source base station; the E-RAB modification indication message includes second indication information, where the second indication information indicates The bearer that needs to be switched;
  • the MME sends the at least one modified bearer request message to the SGW, where the bearer context carried in the at least one modified bearer request message includes only the bearer context that needs to be switched, or the at least one modified bearer request message includes a first indication.
  • Information the first indication information indicating a bearer that needs to be switched.
  • the MME By adding the second indication information to the E-RAB modification indication message to determine the bearer that needs to be switched, the MME is not required to perform another matching action, which saves computing resources.
  • the source base station notifying the MME that the second indication information in the E-RAB modification indication message may take a different granularity
  • the method includes: the E-RAB modification indication message includes a second indication information,
  • the indication information indicates that all bearers in the E-RAB modification indication message are bearers that need to be handed over, or the E-RAB modification indication message includes multiple second indication information, where each of the E-RAB modification indication messages
  • Each bearer corresponds to a second indication information, and each indication information indicates whether the corresponding bearer needs to be switched.
  • Both of the above solutions can indicate the bearer that needs to be switched.
  • the first scheme uses one indication information to indicate multiple bearers, which can save signaling; the second scheme can accurately indicate whether each bearer needs to be switched, and the indication is more accurate.
  • the first indication information in the modification bearer request message notified by the MME to the SGW may also adopt a different granularity as the first embodiment.
  • the modify bearer request message includes a first indication information, and the first indication information indicates that all bearers in the modify bearer request need to be switched.
  • Each bearer, or each modified bearer request message of the at least one modify bearer request message includes a plurality of first indication information, where each bearer in the modify bearer request corresponds to a first indication information, each first indication The information indicates whether the corresponding bearer needs to be switched. Seventh embodiment
  • the above embodiments are mainly improvements for the SGW or the MME.
  • the technical scheme of the source base station is described below. This solution can also implement bearer control in a multi-connection scenario.
  • the UE maintains communication with the source base station and prepares to switch a part of the bearer to the target base station according to the condition of the bearer.
  • the source base station may determine a bearer that needs to be switched by using parameters such as a Qos of the UE or the source base station or a load condition between them.
  • the bearer context obtained by the source base station, the MME, and the SGW corresponds to all bearers.
  • the End Marker message sent by the SGW corresponds to all bearers, that is, bearers that need to be switched, and bearers that do not need to be switched.
  • the source base station may discard the End Marker message corresponding to the bearer that does not need to be switched according to the bearer that needs to be switched.
  • the bearer that does not need to be handed over is reserved, and the UE continues to communicate on the bearer of the source base station.
  • the source base station forwards the End Marker message to the target base station.
  • the End Marker message forwarded in this part corresponds to the bearer that needs to be switched.
  • the target base station can confirm that the bearer that needs to be handed over has been sent by the source base station, and start communication between the target base station and the corresponding UE and the network side device.
  • this embodiment provides a base station, which is used for bearer switching.
  • the base station is a wireless communication system, and the system includes an SGW, a target base station, and at least a part of all bearers of the user equipment and the base station needs to be handed over from the base station to the target base station, where the base station includes:
  • a receiving unit configured to receive an End Marker message sent by the SGW, where the End Marker message is an End Marker message corresponding to all bearers;
  • a processing unit configured to determine a bearer that needs to be switched
  • the base station may further include a sending unit, configured to forward the End Marker message corresponding to the bearer that needs to be handed over to the target base station.
  • the bearer context that needs to be switched may be stored in a memory of the base station.
  • the processing unit of the base station is configured to match the bearer corresponding to the End Marker message with the determined bearer that needs to be handed over. When the two are inconsistent, the End Marker message corresponding to the bearer is discarded. When the two are consistent, the End Marker message corresponding to the bearer is forwarded to the target base station. In this way, the base station reserves the bearer that does not need to be switched, so that the communication is not broken.
  • this embodiment provides a base station, which is used for bearer switching.
  • the base station is a wireless communication system, and the system includes an SGW and a target base station, and at least a part of all bearers of the user equipment and the base station need to be handed over from the base station to the target base station, where the base station includes:
  • a receiver configured to receive an End Marker message sent by the SGW, where the End Marker message is an End Marker message corresponding to all bearers;
  • a processor configured to determine a bearer that needs to be switched
  • the base station further includes a transmitter, configured to forward the End Marker message corresponding to the bearer that needs to be handed over to the target base station.
  • the bearer context that needs to be switched may be stored in a memory of the base station.
  • the processing unit of the base station is configured to match the bearer corresponding to the End Marker message with the determined bearer that needs to be switched. If the two are inconsistent, the End Marker message corresponding to the bearer is discarded. When the two are consistent, the End Marker message corresponding to the bearer is forwarded to the target base station. In this way, the base station reserves the bearer that does not need to be switched, so that the communication is not broken.
  • This embodiment provides a control method used by a base station.
  • the method is applicable to a wireless communication system, where the system includes an SGW, a source base station, and a target base station, and at least a part of all bearers of the user equipment and the source base station need to be handed over from the source base station to the target base station, the method
  • the method includes the following steps: the source base station receives an End Marker message, where the End Marker message is all the bearer pairs End Marker message;
  • the source base station determines a bearer that needs to be switched
  • the source base station discards the End Marker message corresponding to the bearer that does not need to be switched according to the determined bearer that needs to be switched.
  • the End Marker message corresponding to the bearer that needs to be handed over may be forwarded to the target base station.
  • the source base station matches the bearer corresponding to the End Marker message with the determined bearer that needs to be switched, and discards the End Marker message corresponding to the bearer when the two are inconsistent.
  • the End Marker message corresponding to the bearer is forwarded to the target base station. In this way, the source base station will retain the bearers that do not need to be switched, so that communication disconnection will not occur.
  • the base station can determine the bearer that needs to be handed over, and discard the end tag message corresponding to the bearer that does not need to be handed over, and can prevent the subsequent data of the non-handover bearer from being discarded, thereby ensuring the UE and the base station. Multiple connections between each other, thereby improving the stability of the system.
  • This embodiment is also a modification of the source base station.
  • This solution can also implement bearer control in a multi-connection scenario.
  • the UE maintains communication with the source base station and prepares to switch a part of the bearer to the target base station according to the condition of the bearer.
  • the source base station may determine a bearer that needs to be switched by using parameters such as a Qos of the UE or the source base station or a load condition between them.
  • the source base station sends an E-RAB modification indication message corresponding to the bearer that needs to be handed over to the MME.
  • the MME sends a modify bearer request to the SGW according to the E-RAB modification indication message, where the modify bearer request only corresponds to the bearer that needs to be handed over; the SGW sends an End Marker message to the source base station according to the modify bearer request.
  • the End Marker message only corresponds to the bearer that needs to be handed over; it should be noted that the SGW and/or the MME need to reserve the context of the bearer that does not need to be handed over.
  • the End Marker message received by the source base station only corresponds to the need The bearer of the handover does not include the bearer that does not need to be switched.
  • the source base station retains the bearer that does not need to be handed over, and stops subsequent packets of the bearer that needs to be handed over.
  • the source base station transfers the bearer that needs to be handed over to the target base station.
  • the source base station may also forward the received End Marker message to the target base station.
  • the target base station may confirm that the bearer that needs to be handed over has been sent by the source base station, and start communication between the target base station and the corresponding UE and the network side device. .
  • this embodiment provides a base station, which is used for bearer switching.
  • the base station is a wireless communication system, and the system includes an SGW, an MME, and a target base station, and at least a part of all bearers of the user equipment and the base station need to be handed over from the source base station to the target base station, where the base station includes:
  • a receiving unit configured to determine a bearer that needs to be switched
  • a sending unit configured to send an E-RAB modification indication message to the MME, where the E-RAB modification indication message includes only a context of the bearer that needs to be handed over;
  • the receiving unit is further configured to receive an End Marker message sent by the SGW, where the End Marker message only corresponds to a bearer that needs to be switched.
  • the sending unit of the base station is further configured to forward the End Marker message corresponding to the bearer that needs to be handed over to the target base station.
  • this embodiment provides a base station, which is used for bearer switching.
  • the base station is a wireless communication system, and the system includes an SGW, an MME, and a target base station, and at least a part of all bearers of the user equipment and the base station need to be handed over from the source base station to the target base station, where the base station includes:
  • a receiver configured to determine a bearer that needs to be switched
  • a transmitter configured to send an E-RAB modification indication message to the MME, where the E-RAB modification indication message includes only a context of the bearer that needs to be handed over;
  • the receiver is further configured to receive an End Marker message sent by the SGW, where the End Marker message only corresponds to a bearer that needs to be switched.
  • the transmitter of the base station is further configured to use an End Marker corresponding to the bearer that needs to be switched.
  • the message is forwarded to the target base station.
  • This embodiment provides a control method used by a base station.
  • the method is applicable to a wireless communication system, where the system includes an SGW, an MME, a source base station, and a target base station, and at least a part of all bearers of the user equipment and the source base station need to be handed over from the source base station to the target base station.
  • the method includes the following steps:
  • the source base station determines a bearer that needs to be switched
  • the source base station sends an E-RAB modification indication message to the MME, where the E-RAB modification indication message includes only the context of the bearer that needs to be handed over;
  • the source base station receives an End Marker message sent by the SGW, and the End Marker message only corresponds to a bearer that needs to be switched. Further, the End Marker message corresponding to the bearer that needs to be handed over may be forwarded to the target base station.
  • this embodiment provides a communication system for carrying handover.
  • the system includes an SGW, an MME, a source base station, and a target base station, and at least a part of all bearers of the user equipment and the source base station need to be handed over from the source base station to the target base station, where the source base station is in this embodiment.
  • the base station includes an SGW, an MME, a source base station, and a target base station, and at least a part of all bearers of the user equipment and the source base station need to be handed over from the source base station to the target base station, where the source base station is in this embodiment.
  • the base station is not limited to carry handover.
  • the source base station can avoid the discarding of subsequent data of the non-handover bearer for the multi-connection scenario, and ensure multiple connections between the UE and the base station, thereby improving system stability.
  • Embodiments of the present invention provide a network side device for controlling bearer switching.
  • the network side device belongs to a wireless communication system, and the system further includes a source base station and a target base station, and at least a part of all bearers between the user equipment and the source base station needs to be handed over from the source base station to the target base station.
  • the network side device 1200 includes:
  • the receiver 1203 is configured to receive a bearer switching message.
  • the processor 1201 is configured to determine, according to the bearer switching message, a bearer that needs to be switched in all bearers, so that an end marker End Marker message is sent to the source base station only for a bearer that needs to be handed over.
  • the processor 1201 may perform all the functions of the processing unit in the first embodiment, or perform the same steps.
  • the receiver 1203 may perform all the functions of the receiving unit in the first embodiment, or perform the same steps.
  • the processor and the receiver connection relationship are consistent with the connection relationship between the processing unit and the receiving unit of the first embodiment.
  • the network-side device can determine the bearer that needs to be handed over, so that the end-mark message is sent only to the bearer that needs to be handed over, and the subsequent data of the non-handover bearer can be discarded, thereby ensuring the UE and the base station. Multiple connections between each other, thereby improving the stability of the system.
  • This embodiment describes a technical solution in which the network side device is an SGW.
  • the SGW 1300 may include: a receiver 1303, configured to receive at least one modify bearer request message sent by a mobility management entity MME, where a bearer context included in the at least one modify bearer request message corresponds to the All bearers;
  • the processor 1301 is configured to determine, according to the bearer context in the at least one modified bearer request message, a bearer that needs to be switched;
  • the transmitter 1302 is configured to send the End Marker message to the source base station only for a bearer that needs to be handed over.
  • the processor 1301 may perform all the functions of the processing unit in the second embodiment, or perform the same steps; the receiver 1303 may complete all the functions of the receiving unit in the second embodiment, or perform the same steps; The transmitter 1302 can perform all the functions of the receiving unit in the second embodiment, or perform the same steps.
  • the connection relationship between the processor, the receiver, and the transmitter is consistent with the connection relationship between the processing unit, the receiving unit, and the transmitting unit of the second embodiment.
  • the SGW can determine the bearer that needs to be handed over for the scenario of the multi-connection, so that the SGW sends the end tag message only to the bearer that needs to be handed over, and can prevent the subsequent data of the non-handover bearer from being discarded, thereby ensuring the UE and the base station.
  • Multiple connections which in turn improve the stability of the system.
  • This embodiment describes a technical solution in which the network side device is an MME.
  • the MME 1400 may include:
  • the receiver 1403 is configured to receive an E-RAB modification indication message sent by the source base station, where the bearer context included in the E-RAB modification indication message corresponds to all the bearers.
  • the processor 1401 is configured to determine, according to the bearer context in the E-RAB modification indication message, a bearer that needs to be switched;
  • the transmitter 1402 is configured to send a modify bearer request message to the SGW, where the bearer context carried in the modify bearer request message includes only the bearer context of the bearer that needs to be handed over.
  • the processor 1401 may perform all the functions of the processing unit in the third embodiment, or perform the same steps; the receiver 1403 may complete all the functions of the receiving unit in the third embodiment, or perform the same steps; The transmitter 1402 can perform all the functions of the receiving unit in the third embodiment, or perform the same steps.
  • the connection relationship between the processor, the receiver, and the transmitter is consistent with the connection relationship between the processing unit, the receiving unit, and the transmitting unit of the third embodiment.
  • This embodiment is a device claim similar to that of the third embodiment, and effects similar to those of the third embodiment can be achieved, and will not be described again.
  • the MME can determine the bearer that needs to be handed over for the multi-connection scenario, so that the SGW can only send the end tag message to the bearer that needs to be handed over, and can prevent the subsequent data of the non-handover bearer from being discarded, thereby ensuring the UE and the base station. Multiple connections between each other, thereby improving the stability of the system.
  • the method steps and elements can be implemented in electronic hardware, computer software, or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the steps of the various embodiments have been generally described in terms of function in the foregoing description. And composition.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a computer.
  • computer readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage media or other magnetic storage device, or can be used for carrying or storing in the form of an instruction or data structure.
  • the desired program code and any other medium that can be accessed by the computer may suitably be a computer readable medium.
  • any connection may suitably be a computer readable medium.
  • the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then Coaxial cables, fiber optic cables, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the fixing of the associated medium.
  • a disk and a disc include a compact disc (CD), a laser disc, a compact disc, a digital versatile disc (DVD), a floppy disc, and a Blu-ray disc, wherein the disc is usually magnetically copied, and the disc is The laser is used to optically replicate the data. Combinations of the above should also be included within the scope of the computer readable media.

Abstract

本发明实施例公开了一种控制承载切换的设备和控制方法。所述方法包括：所述网络侧设备接收承载切换消息；所述网络侧设备根据所述承载切换消息确定所述所有承载中需要切换的承载，以使得仅针对需要切换的承载向所述源基站发送结束标记End Marker消息。通过上述方案，针对多连接的场景，网络侧设备可以确定需要切换的承载，使得仅对需要切换的承载才发送结束标记消息，可以避免非切换承载的后续数据的丢弃，保证了UE与基站之间的多连接，进而提高系统的稳定性。

Description

一种控制承载切换的设备和控制方法 技术领域
本发明实施例涉及通信领域， 尤其涉及一种控制承载切换的设备和控制方 法。
背景技术
当前的演进分组系统 （Evolved Packet System, EPS) 无线网络架构如图 1 所示， 其中主要网络实体功能如下： 演进的通用陆基无线接入网 ( Evolved universal terrestrial radio access network, E-UTRAN) 由多个基站 (Evolved Node B， eNodeB, 或者 eNB) 组成的网络， 实现无线物理层功能、 资源调度和无线资源管理、无线接入控制以 及移动性管理功能。 eNodeB通过用户面接口 S 1 -U和 S-GW相连，用于传送用户数据； 通过控制面接口 S1-MME和 MME相连，采用 S1-AP协议实现无线接入承载控制等功能。
移动性管理实体 （Mobility Management Entity, MME) 主要负责用户会话 管理的所有控制平面功能， 包括非接入层 （Non-Access-Stratum, NAS) 信令及 安全， 跟踪区列表 （Tracking Area List)的管理， P-GW与 S-GW的选择等。
服务网关 （Serving Gateway, S-GW, 或者 SGW) 主要负责用户设备（User Equipment, UE)的数据传输、 转发以及路由切换等， 并作为用户设备在 eNodeB 之间切换时的本地移动性锚定点， 对于每一个用户设备， 每个时刻仅有一个 S-GW 为之服务。
PDN网关 (PDN Gateway, P_GW， 或者 PGW)作为分组数据网络（Packet Data
Network, PDN)连接的锚定点， 负责用户设备的 IP地址分配， 用户设备的数据报 文过滤、 速率控制、 生成计费信息等。
用户设备通过附着流程， 接入 EPS网络并创建 PDN连接， 在此过程中， PGW 为用户设备分配 PDN地址， 用户设备通过该 PDN地址连接通过 PGW实现与外部网络 的数据传输。附着流程结束后， UE可以申请额外的 PDN连接以获取额外的 PDN地址， 具体流程与附着流程类似。 为了解决空口传输的瓶颈问题， 人们期望 UE可以使用双连接（Dual connectivity)特性， 从而增加 UE与基站之间的传输速率。 即 UE同时连接至两个 eNB, 多个承载在不同的 eNB上传输。但是传统的承载过程没有针对双连接做特别 的控制。 当第一 eNB将 UE的一部分承载转移到第二 eNB的过程中， 对应的网络侧设 备并不知晓其双连接的过程，因而仍然会采用传统的针对单连接的承载进行处理。 显然， 这种针对单连接的处理方式运用在双连接的承载中， 无法满足双连接的处 理需求， 从而会导致通信异常。 发明内容
有鉴于此， 本发明实施例提供了一种控制承载切换的设备和控制方法， 可 以解决多连接场景下的承载丢失问题。
本发明的实施例提供一种网络侧设备， 用于控制承载切换， 所述网络侧设 备属于无线通信系统， 所述系统还包括源基站和目标基站， 用户设备与所述源基 站之间的所有承载的至少一部分需要从所述源基站切换到所述目标基站，所述网 络侧设备包括： 接收单元， 用于接收承载切换消息； 处理单元， 用于根据所述承 载切换消息确定所述所有承载中需要切换的承载，以使得仅针对需要切换的承载 向所述源基站发送结束标记 End Marker消息。
可选地， 所述网络侧设备为服务网关 SGW， 其中， 所述接收单元， 用于接收 承载切换消息， 包括： 所述 SGW的接收单元， 用于接收移动性管理实体 MME发送的 至少一个修改承载请求消息，所述至少一个修改承载请求消息中包括的承载上下 文对应所述所有承载； 所述处理单元， 用于根据所述承载切换消息确定所述所有 承载中需要切换的承载，以使得仅针对需要切换的承载向所述源基站发送结束标 记 End Marker消息， 包括： 所述 SGW的处理单元， 用于根据所述至少一个修改承 载请求消息中的承载上下文， 确定需要切换的承载； 所述 SGW进一步包括发送单 元， 用于仅对需要切换的承载向所述源基站发送所述 End Marker消息。 可选地， 所述 SGW的处理单元， 用于根据所述至少一个修改承载请求消息中 的承载上下文， 确定需要切换的承载， 包括： 用于将所述至少一个修改承载请求 消息中的承载上下文中的全称隧道端点标识（Fully Qualified Tunnel End Point Identifier, F-TEID)与当前自身存储的承载上下文中的 F-TEID匹配，当一个承载 的 F-TEID发生变化时， 确定所述承载为需要切换的承载； 或者用于将所述至少一 个修改承载请求消息中的承载上下文中的基站地址与当前自身存储的承载上下 文中的基站地址匹配， 当一个承载的基站地址发生变化时， 确定所述承载为需要 切换的承载。
可选地， 所述网络侧设备为服务网关 SGW， 其中， 所述接收单元， 用于接收 承载切换消息， 包括： 所述 SGW的接收单元， 用于接收移动性管理实体 MME发送的 至少一个修改承载请求消息， 所述修改承载请求消息包括第一指示信息， 所述第 一指示信息指示需要切换的承载； 所述处理单元， 用于根据所述承载切换消息确 定所述所有承载中需要切换的承载，以使得仅针对需要切换的承载向所述源基站 发送结束标记 End Marker消息， 包括： 所述 SGW的处理单元， 用于根据所述至少 一个修改承载请求消息中的第一指示信息， 确定需要切换的承载； 所述 SGW进一 步包括发送单元， 用于仅对需要切换的承载向所述源基站发送所述 End Marker 消息。
可选地， 所述至少一个修改承载请求消息的每个修改承载请求消息包含一 个第一指示信息，所述第一指示信息指示所述修改承载请求中的所有承载为需要 切换的承载，或者所述至少一个修改承载请求消息的每个修改承载请求消息包含 多个第一指示信息，其中所述修改承载请求中的每个承载对应一个第一指示信息， 每个指示信息指示所对应的承载是否需要切换。
可选地， 所述 SGW的处理单元， 还用于保留不需要切换的承载上下文。
可选地， 所述网络侧设备为移动性管理实体 MME， 其中： 所述接收单元， 用 于接收承载切换消息， 包括： 所述 MME的接收单元， 用于接收所述源基站发送的 演进的通用陆基无线接入网无线接入承载 E-RAB修改指示消息；所述 E-RAB修改指 示消息包括的承载上下文对应所述所有承载； 所述处理单元， 用于根据所述承载 切换消息确定所有的承载中需要切换的承载，以使得仅针对需要切换的承载向所 述源基站发送结束标记 End Marker消息， 包括： 所述 MME的处理单元， 用于根据 所述 E-RAB修改指示消息中的承载上下文确定需要切换的承载；所述 MME进一步包 括发送单元， 用于向 SGW发送修改承载请求消息， 所述修改承载请求消息中携带 的承载上下文， 只包括所述需要切换的承载的承载上下文。
可选地， 所述 MME的处理单元， 用于根据所述 E-RAB修改指示消息中的承载 上下文确定需要切换的承载， 包括： 用于将所述 E-RAB修改指示消息中的所有承 载的承载上下文中的 F-TEID与当前存储的承载上下文的 F-TEID匹配，当一个承载 的 F-TEID发生变化时， 确定所述承载为需要切换的承载； 或者用于将所述 E-RAB 修改指示消息中的所有承载的承载上下文中的基站地址与当前自身存储的承载 上下文中的基站地址匹配， 当一个承载的基站地址发生变化时， 确定所述承载为 需要切换的承载。
可选地， 所述网络侧设备为移动性管理实体 MME， 其中： 所述接收单元， 用 于接收承载切换消息， 包括： 所述 MME的接收单元， 用于接收所述源基站发送的 E-RAB修改指示消息； 所述 E-RAB修改指示消息包括第二指示信息， 所述第二指示 信息指示需要切换的承载； 所述处理单元， 用于根据所述承载切换消息确定所述 所有的承载中需要切换的承载，以使得仅针对需要切换的承载向所述源基站发送 结束标记 End Marker消息， 包括： 所述 MME的处理单元， 用于根据所述 E-RAB修改 指示消息中的第二指示信息， 确定需要切换的承载； 所述 MME进一步包括发送单 元， 用于向 SGW发送至少一个修改承载请求消息， 所述至少一个修改承载请求消 息中携带的承载上下文， 只包括所述需要切换的承载上下文， 或者所述至少一个 修改承载请求消息包括第一指示信息， 该第一指示信息指示需要切换的承载。 可选地， 所述 E-RAB修改指示消息包含一个第二指示信息， 所述第二指示信 息指示所述 E-RAB修改指示消息中的所有承载为需要切换的承载，或者所述 E-RAB 修改指示消息包含多个第二指示信息， 其中所述 E-RAB修改指示消息中的每个承 载对应一个第二指示信息， 每个指示信息指示所对应的承载是否需要切换。
可选地， 所述至少一个修改承载请求消息的每个修改承载请求消息包含一 个第一指示信息，所述第一指示信息指示所述修改承载请求中的所有承载为需要 切换的承载，或者所述至少一个修改承载请求消息的每个修改承载请求消息包含 多个第一指示信息，其中所述修改承载请求中的每个承载对应一个第一指示信息， 每个指示信息指示所对应的承载是否需要切换。
本发明的实施例提供一种承载切换的控制方法。 所述方法适用于无线通信 系统， 所述系统包括网络侧设备、源基站和目标基站， 用户设备与所述源基站之 间的所有承载的至少一部分需要从所述源基站切换到所述目标基站，所述方法包 括如下步骤： 所述网络侧设备接收承载切换消息； 所述网络侧设备根据所述承载 切换消息确定所述所有承载中需要切换的承载，以使得仅针对需要切换的承载向 所述源基站发送结束标记 End Marker消息。
可选地， 所述网络侧设备为服务网关 SGW， 其中， 所述网络侧设备接收承载 切换消息， 包括： 所述 SGW接收移动性管理实体 MME发送的至少一个修改承载请求 消息， 所述至少一个修改承载请求消息中包括的承载上下文对应所述所有承载； 所述网络侧设备根据所述承载切换消息确定所述所有承载中需要切换的承载，以 使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker消息， 包括： 所述 SGW根据所述至少一个修改承载请求消息中的承载上下文， 确定需要切换的 承载； 所述 SGW仅对需要切换的承载向所述源基站发送所述 End Marker消息。
可选地， 所述 SGW根据所述至少一个修改承载请求消息中的承载上下文， 确 定需要切换的承载， 包括： 所述 SGW将所述至少一个修改承载请求消息中的承载 上下文中的 F-TEID与当前自身存储的承载上下文中的 F-TEID匹配，当一个承载的 F-TEID发生变化时， 确定所述承载为需要切换的承载； 或者所述 SGW将所述至少 一个修改承载请求消息中的承载上下文中的基站地址与当前自身存储的承载上 下文中的基站地址匹配， 当一个承载的基站地址发生变化时， 确定所述承载为需 要切换的承载。
可选地， 所述网络侧设备为服务网关 SGW， 其中， 所述网络侧设备接收承载 切换消息， 包括： 所述 SGW接收移动性管理实体 MME发送的至少一个修改承载请求 消息， 所述修改承载请求消息包括第一指示信息， 所述第一指示信息指示需要切 换的承载；所述网络侧设备根据所述承载切换消息确定所述所有承载中需要切换 的承载， 以使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker 消息， 包括： 所述 SGW根据所述至少一个修改承载请求消息中的第一指示信息， 确定需要切换的承载； 所述 SGW仅对需要切换的承载向所述源基站发送所述 End M&rker消息。
可选地， 所述至少一个修改承载请求消息的每个修改承载请求消息包含一 个第一指示信息，所述第一指示信息指示所述修改承载请求中的所有承载为需要 切换的承载，或者所述至少一个修改承载请求消息的的每个修改承载请求消息包 含多个第一指示信息，其中所述修改承载请求中的每个承载对应一个第一指示信 息， 每个第一指示信息指示所对应的承载是否需要切换。
可选地， 所述控制方法， 进一步包括， 所述 SGW保留不需要切换的承载上下 文。
可选地， 所述网络侧设备为移动性管理实体 MME， 其中： 所述网络侧设备接 收承载切换消息， 包括： 所述 MME接收所述源基站发送的演进的通用陆基无线接 入网无线接入承载 E-RAB修改指示消息；所述 E-RAB修改指示消息包括的承载上下 文对应所述所有承载；所述网络侧设备根据所述承载切换消息确定所有的承载中 需要切换的承载， 以使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker消息， 包括： 所述 MME根据所述 E-RAB修改指示消息中的承载上下文确定需 要切换的承载； 所述 MME向 SGW发送修改承载请求消息， 所述修改承载请求消息中 携带的承载上下文， 只包括所述需要切换的承载上下文。
可选地， 所述 MME根据所述 E-RAB修改指示消息中的承载上下文确定需要切 换的承载， 包括： 所述 MME将所述 E-RAB修改指示消息中的所有承载的承载上下文 中的 F-TEID与当前存储的承载上下文的 F-TEID匹配，当一个承载的 F-TEID发生变 化时， 确定所述承载为需要切换的承载； 或者所述 MME将所述 E-RAB修改指示消息 中的所有承载的承载上下文中的目标基站地址与当前自身存储的承载上下文中 的基站地址匹配， 当一个承载的基站地址发生变化时， 确定所述承载为需要切换 的承载。
可选地， 所述网络侧设备为移动性管理实体 MME， 其中： 所述网络侧设备接 收承载切换消息， 包括： 所述 MME接收所述源基站发送的 E-RAB修改指示消息； 所 述 E-RAB修改指示消息包括第二指示信息， 所述第二指示信息指示需要切换的承 载；所述网络侧设备根据所述承载切换消息确定所述所有的承载中需要切换的承 载， 以使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker消息， 包括： 所述 MME根据所述 E-RAB修改指示消息中的第二指示信息， 确定需要切换的 承载； 所述 MME向 SGW发送至少一个修改承载请求消息， 所述至少一个修改承载请 求消息中携带的承载上下文， 只包括所述需要切换的承载上下文， 或者所述至少 一个修改承载请求消息包括第一指示信息，该第一指示信息指示需要切换的承载。
可选地， 所述 E-RAB修改指示消息包含一个第二指示信息， 所述指示信息指 示所述 E-RAB修改指示消息中的所有承载为需要切换的承载，或者所述 E-RAB修改 指示消息包含多个第二指示信息， 其中所述 E-RAB修改指示消息中的每个承载对 应一个第二指示信息， 每个指示信息指示所对应的承载是否需要切换。
可选地， 所述修改承载请求消息的每个修改承载请求消息包含一个第一指 示信息，所述第一指示信息指示所述修改承载请求中的所有承载为需要切换的承 载，或者所述至少一个修改承载请求消息的每个修改承载请求消息包含多个第一 指示信息， 其中所述修改承载请求中的每个承载对应一个第一指示信息， 每个第 一指示信息指示所对应的承载是否需要切换。
通过上述方案，针对多连接的场景，网络侧设备可以确定需要切换的承载， 使得仅对需要切换的承载才发送结束标记消息，可以避免非切换承载的后续数据 的丢弃， 保证了 UE与基站之间的多连接， 进而提高系统的稳定性。 附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对本发明实施例中所需 要使用的附图作简单地介绍， 显而易见地， 下面所描述的附图仅仅是本发明的一 些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还可 以根据这些附图获得其他的附图。
图 1是现有技术中无线网络架构的示意图；
图 2是 UE通过附着流程建立承载的示意图；
图 3是针对单连接承载切换的示意图；
图 4是本发明第一实施例的网络侧设备的框图；
图 5是本发明第二实施例的控制承载切换的技术方案的示意图；
图 6是本发明第二实施例的 SGW的框图；
图 7是本发明第三实施例的控制承载切换的技术方案的示意图；
图 8是本发明第三实施例的 MME的框图；
图 9是本发明第四实施例的承载切换的控制方法的示意图； 图 10是本发明第五实施例的承载切换的控制方法的示意图； 图 11是本发明第六实施例的承载切换的控制方法的示意图；
图 12是本发明第九实施例的网络侧设备的框图；
图 13是本发明第十实施例的 SGW的框图；
图 14是本发明第十一实施例的 MME的框图。
具体实施方式
下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进行清 楚、 完整地描述， 显然， 所描述的实施例是本发明的一部分实施例， 而不是全部 实施例。基于本发明中的实施例， 本领域普通技术人员在没有做出创造性劳动的 前提下所获得的所有其他实施例， 都应属于本发明保护的范围。
本发明中提到的基站， 可以是长期演进（Long Term Evolution ，LTE)系统 的基站， 也可以是通用移动通讯系统 （Universal Mobile Telecommunications System, UMTS) 系统的基站， 还可以其它系统的基站， 本发明不作限定。
图 2示出一种通信系统， 其包括源基站、 目标基站和用户设备等实体。 这里 参照图 2简要介绍一下用户设备通过传统的附着流程建立承载的过程。 这里的描 述只是示意性的，并且省略了一些实体和相关的处理，比如家乡签约服务器 (Home Subscriber Server， HSS)实体。 下述步骤的编号并不限定步骤的先后顺序。
步骤 201， UE通过 eNB发送附着请求给 MME。
步骤 202， MME发送选择对应的 SGW与 PGW， 发送创建会话请求给 SGW。
步骤 203， SGW创建缺省承载上下文信息并创建会话请求给 PGW。
步骤 204， PGW创建缺省承载上下文信息， 并创建会话应答消息给 SGW。 步骤 205， SGW返回创建会话响应给 MME。
步骤 206， MME发送附着接受消息给 eNB。
步骤 207， eNB与 UE通过 RRC连接重配置消息完成附着流程。 对应地， 上述承载所经过的各个实体可以对应保存承载上下文以及相关的 信息，并将它们记录在对应实体的存储器中。在建立承载成功之后， UE建立与 PGW 的至少一个承载。 SGW会存储该 UE对应的所有承载的承载上下文。 具体地， 一个 UE与一个 PGW之间存在一个 PDN连接； 一个 UE可以与多个 PGW建立多个 PDN连接。
如图 3所示， 一种通信系统包括源基站、 目标基站和用户设备， 所述用户设 备与所述源基站之间的所有承载的至少一部分需要从所述源基站切换到所述目 标基站。 在通过 E-RAB修改流程完成双连接的过程中， 如果采用现有针对单连接 的处理， 则实现过程可以如下。
步骤 301 : 第一 eNB (图 3中为 Master eNB)发起第二 eNB修改流程， 将需要切 换至第二 eNB的那些承载的承载上下文传输至第二 eNB。所述承载上下文中包括承 载标识， QoS， 上行数据的 SGW的地址以及 TEID等信息；
步骤 302: 第一 eNodeB发送 E-RAB修改指示消息至 MME， 所示消息中携带用户 设备所有承载的承载上下文， 包括每个承载对应的 eNB地址与 TEID信息， 其中需 要切换至第二 eNB的那些承载的承载上下文中携带第二 eNB的地址与 TEID,不需要 切换的那些承载的承载上下文中携带原有的 eNB与 TEID;
步骤 303: MME发送修改承载请求消息给 SGW， 消息中携带有承载上下文， 所 述承载上下文包括承载对应的 eNB地址与 TEID信息；
步骤 304： SGW返回修改承载响应消息给 MME；
步骤 305: MME发送 E-RAB修改确认消息给第一 eNB;
步骤 306: SGW在步骤 303后， 会在旧的路径上对所有承载发送 End marker消 息给第一 eNB， 同时 SGW根据修改承载请求消息更新所有承载对应的 eNB地址与 TEID; 第一 eNB收到 End marker消息后会将对应的承载转发至第二 eNB。 第一 eNB 转发这些承载的 End marker给第二 eNB。 因为这些 End marker消息对应的是所有 承载， 所以， 第一 eNB收到 End Marker后会停止接受对应的所有承载的所有的后 续报文。 这就导致第一 eNB对非切换承载的后续下行数据的丢弃， 导致用户业务 的中断， 而第二 eNB并不期望接受这部分不需要切换的承载， 造成业务矛盾。
基于上述方案中可能存在的数据丢失问题， 本发明实施例提供了相应的控 制承载切换的实现方案。 下面对这些实现方案进行详细说明。
第一实施例
如图 4所示， 本发明的实施例提供一种网络侧设备， 用于控制承载切换。 所 述网络侧设备属于无线通信系统， 所述系统还包括源基站和目标基站， 用户设备 与所述源基站之间的所有承载的至少一部分需要从所述源基站切换到所述目标 基站， 所述网络侧设备 400包括：
接收单元 403， 用于接收承载切换消息；
处理单元 401，用于根据所述承载切换消息确定所述所有承载中需要切换的 承载， 以使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker消息。
通过上述方案，针对多连接的场景，网络侧设备可以确定需要切换的承载， 使得仅对需要切换的承载才发送结束标记消息，可以避免非切换承载的后续数据 的丢弃， 保证了 UE与基站之间的多连接， 进而提高系统的稳定性。
本实施例中的网络侧设备可以是服务网关 SGW， 也可以是移动性管理实体 MME, 下文中具体介绍。
第二实施例
本实施例介绍该网络侧设备为 SGW的技术方案。
本实施例提供一种技术方案， 其中， UE与源基站保持通信， 并根据承载的 情况准备将一部分承载切换到目标基站。 具体地， 如图 5所示， 所述方案可以包 括如下步骤：
步骤 501， 源基站可以通过 UE或者源基站的 Qos或者他们之间的负载情况等 参数来确定需要切换的承载。 这些需要切换的承载可以是一个承载也可以是多个承载。
步骤 502， 源基站向 MME发送 E-RAB修改指示消息给 MME， 所述 E-RAB修改指示 消息中包含承载上下文对应所述所有承载；所述 MME根据上述 E-RAB修改指示消息 发送至少一个修改承载请求消息给 SGW， 所述至少一个修改承载请求消息中包括 的承载上下文对应所述所有承载。
其中 MME发送的至少一个修改承载请求消息可以包括多条修改承载请求消 息。 其中每个修改承载请求消息对应一个 PDN连接， 每个修改承载请求消息包括 的上下文所对应的承载， 对应于所述修改承载请求消息所对应的 PDN连接， 且所 有的修改承载请求消息中包括的上下文对应所述所有承载。
步骤 503，所述 SGW可以接收移动性管理实体 MME发送的至少一个修改承载请 求消息，所述至少一个修改承载请求消息中包括的承载上下文对应所述所有承载； 所述 SGW可以根据所述至少一个修改承载请求消息中的承载上下文， 确定需要切 换的承载。
后续所述 SGW则可以向 MME发送修改承载响应消息，所述 MME可以向源基站发 送 E-RAB修改确认消息， 在此不赘述。
步骤 504， 所述 SGW可以仅对需要切换的承载向所述源基站发送所述 End M&rker消息。
步骤 505， 所述源基站在接收 End Marker消息后， 可以将收到的所述 End Marker消息转发给目标基站。
所述源基站收到的所述 End Marker消息仅对应于需要切换的承载， 不包括 不需要切换的承载。对应地， 所述源基站保留了不需要切换的承载， 并停止需要 切换的承载的后续报文。源基站将需要切换的承载转移到目标基站。源基站也可 以将收到的所述 End Marker消息转发给目标基站， 目标基站收到该消息后可以确 认需要切换的承载的数据流已经由源基站发送完毕，开始目标基站与对应 UE和网 络侧设备的通信。
对应地， 如图 6所示， 所述 SGW 600可以包括： 接收单元 603， 用于接收移动 性管理实体 MME发送的至少一个修改承载请求消息， 所述至少一个修改承载请求 消息中包括的承载上下文对应所述所有承载；
处理单元 601， 用于根据所述至少一个修改承载请求消息中的承载上下文， 确定需要切换的承载；
发送单元 602， 用于仅对需要切换的承载向所述源基站发送所述 End Marker 消息。
所述仅对需要切换的承载发送 End Marker消息， 是指， 对需要切换的承载 发送 End Marker消息， 并且对不需要切换的承载不发送 End Marker消息。
所述承载是指用户设备与 PGW之间的传输通道。 该传输通道包括用户设备、 基站、 MME、 SGW, PGW等实体。 SGW在发送 End Marker消息的时候， 为了防止 End Marker丢失， 可以针对每个承载发送至少一个 End Marker。
通过上述方案，针对多连接的场景， SGW可以确定需要切换的承载，从而 SGW 仅对需要切换的承载才发送结束标记消息，可以避免非切换承载的后续数据的丢 弃， 保证了 UE与基站之间的多连接， 进而提高系统的稳定性。
进一步地， 所述至少一个修改承载请求消息中包含的承载上下文中含有 F-TEID。每个承载上下文对应一个 F-TEID。所述 SGW将收到的承载上下文的 F-TEID 与其建立承载时获得的对应的承载上下文中的 F-TEID进行匹配。 当一个承载的 F-TEID发生变化时， 确定所述承载为需要切换的承载。 通常所述 SGW可以在建立 承载时获得的对应的承载上下文， 并保存在 SGW中的存储器中。 所述 F-TEID通常 包括基站地址与 TEID信息。 SGW也可以通过仅匹配所述基站地址的变化来获得需 要切换的承载。 SGW也可以通过匹配所述基站地址与 TEID信息的变化来获得需要 切换的承载。 对应地， 所述 SGW的处理单元，用于根据所述至少一个修改承载请求消息中 的承载上下文， 确定需要切换的承载， 包括， 用于将所述至少一个修改承载请求 消息中的承载上下文中的 F-TEID与当前自身存储的承载上下文中的 F-TEID匹配， 当一个承载的 F-TEID发生变化时， 确定所述承载为需要切换的承载； 或者
用于将所述至少一个修改承载请求消息中的承载上下文中的基站地址与当 前自身存储的承载上下文中的基站地址匹配，当一个承载的基站地址发生变化时， 确定所述承载为需要切换的承载。
进一步地， 所述 SGW的处理单元， 还用于保留不需要切换的承载上下文。 这 样 SGW可以保持原承载的正常通信。
上述方案通过匹配 F-TEID或者基站地址的变化就可以确定需要切换的承载， 以方便后续仅对需要切换的承载才发送对应的 End Marker. 该方案不需要额外增 加新的信令， 节省了信令资源。
作为另一种可能的实现方式，所述 SGW可以不用匹配 F-TEID或者基站地址的 变化来获得需要切换的承载。所述 SGW可以通过指示信息来指示需要切换的承载。 具体地， 源基站可以在发送给 MME的 E-RAB修改指示消息中包含第二指示信息， 所 述第二指示信息指示需要切换的承载。所述 MME根据上述 E-RAB修改指示消息以及 对应的第二指示信息， 生成至少一个修改承载请求消息， 所述修改承载请求消息 包括第一指示信息， 所述第一指示信息指示需要切换的承载； 所述 MME将所述至 少一个修改承载请求消息发送给 SGW。 SGW可以接收移动性管理实体 MME发送的至 少一个修改承载请求消息， 所述修改承载请求消息包括第一指示信息， 所述第一 指示信息指示需要切换的承载；根据所述至少一个修改承载请求消息中的第一指 示信息， 确定需要切换的承载； 仅对需要切换的承载向所述源基站发送所述 End Marker消息。所述源基站和目标基站的过程与上述匹配 F-TEID或基站地址的方案 一致， 不再赘述。 对应的， 所述接收单元， 用于接收承载切换消息， 包括： 接收单元， 用于 接收移动性管理实体 MME发送的至少一个修改承载请求消息， 所述修改承载请求 消息包括第一指示信息， 所述第一指示信息指示需要切换的承载；
处理单元， 用于根据所述至少一个修改承载请求消息中的第一指示信息， 确定需要切换的承载；
发送单元， 用于仅对需要切换的承载向所述源基站发送所述 End Marker消 息。
通过在修改承载请求消息中增加第一指示信息来确定需要切换的承载， 可 以不需要 SGW做另外的匹配动作， 节约运算资源。
另外， MME通知 SGW的修改承载请求消息中的第一指示信息可以采取不同的 粒度， 包括： 一个修改承载请求消息包含一个第一指示信息， 所述第一指示信息 指示所述修改承载请求中的所有承载为需要切换的承载；或者所述至少一个修改 承载请求消息的每个修改承载请求消息包含多个第一指示信息，其中所述修改承 载请求中的每个承载对应一个第一指示信息，每个指示信息指示所对应的承载是 否需要切换。上述两种方案都可以指示需要切换的承载。第一种方案使用一个指 示信息指示多个承载， 可以节省信令； 采用第二种方案可以准确指示每一个承载 是否需要切换， 指示更准确。
进一步地， 所述 SGW的处理单元， 还用于保留不需要切换的承载上下文。 这 样 SGW可以保持原承载的正常通信。
第三实施例
本实施例介绍该网络侧设备为 MME的技术方案。
与图 5的方案类似， 本实例提供一种技术方案。 具体地， 所示方案可以包括 如下步骤：
步骤 701， 源基站确定需要切换的承载， 并向 MME发送 E-RAB修改指示消息， 所述 E-RAB修改指示消息中包括的承载上下文对应所述所有承载。
步骤 702，所述 MME根据所述 E-RAB修改指示消息中的承载上下文确定需要切 换的承载。
步骤 703， 所述 MME向 SGW发送修改承载请求消息， 所述修改承载请求消息中 携带的承载上下文， 只包括所述需要切换的承载上下文。
步骤 704， 所述 SGW根据收到的修改承载请求消息中携带的承载上下文仅对 需要切换的承载向所述源基站发送所述 End Marker消息。
所述源基站和目标基站的后续过程与图 5的方案一致， 不再赘述。
需要注意的是， 在本实施例中， MME在承载建立后， 要存储所有承载的承载 上下文。对应的， SGW不删除 MME传来的修改承载请求消息中未包含的承载的上下 文， 将这部分承载作为不需要切换的承载进行保留。
对应地， 如图 8所示， 所述 MME 800可以包括：
接收单元 803， 用于接收所述源基站发送的 E-RAB修改指示消息； 所述 E-RAB 修改指示消息包括的承载上下文对应所述所有承载；
处理单元 801， 用于根据所述 E-RAB修改指示消息中的承载上下文确定需要 切换的承载；
发送单元 802， 用于向 SGW发送修改承载请求消息， 所述修改承载请求消息 中携带的承载上下文， 只包括所述需要切换的承载的承载上下文。
对应地， SGW的接收单元， 用于接收修改承载请求消息， 所述修改承载请求 消息指示需要切换的承载以及需要切换的承载的上下文；
SGW的处理单元，用于根据所述修改承载请求消息针对需要切换的承载产生 End Marker消息；
SGW的发送单元， 对需要切换的承载发送 End Marker消息。
进一步地， 所述 SGW的处理单元， 还用于保留不需要切换的承载上下文。 通过上述方案，针对多连接的场景， MME可以确定需要切换的承载，使得 SGW 可以仅对需要切换的承载才发送结束标记消息，可以避免非切换承载的后续数据 的丢弃， 保证了 UE与基站之间的多连接， 进而提高系统的稳定性。
进一步地， 所述 E-RAB修改指示消息中包含的承载上下文中含有 F-TEID。所 述 MME将收到的承载上下文的 F-TEID与其建立承载时获得的对应的承载上下文中 的 F-TEID进行匹配。 当一个承载的 F-TEID发生变化时， 确定所述承载为需要切换 的承载。 通常所述 MME可以在建立承载时获得的对应的承载上下文，并保存在 MME 中的存储器中。 与第二实施例类似地， MME也可以通过仅匹配所述基站地址的变 化来获得需要切换的承载。 MME也可以通过匹配所述基站地址与 TEID信息的变化 来获得需要切换的承载。
对应地， 所述 MME的处理单元， 用于根据所述 E-RAB修改指示消息中的承载 上下文确定需要切换的承载， 包括： 用于将所述 E-RAB修改指示消息中的所有承 载的承载上下文中的 F-TEID与当前存储的承载上下文的 F-TEID匹配，当一个承载 的 F-TEID发生变化时， 确定所述承载为需要切换的承载； 或者
用于将所述 E-RAB修改指示消息中的所有承载的承载上下文中的基站地址 与当前自身存储的承载上下文中的基站地址匹配，当一个承载的基站地址发生变 化时， 确定所述承载为需要切换的承载。
通过匹配 F-TEID或者基站地址的变化就可以确定需要切换的承载， 不需要 额外增加新的信令， 就可以满足多连接的场景要求。
作为另一种可能的实现方式， 与第一实施例中类似的， 所述 MME可以不用匹 配 F-TEID或者基站地址的变化来获得需要切换的承载。 所述 MME可以通过指示信 息来指示需要切换的承载。具体地， 源基站可以在发送给 MME的 E-RAB修改指示消 息中包含第二指示信息， 所述第二指示信息指示需要切换的承载。 所述 MME根据 所述 E-RAB修改指示消息中的第二指示信息，确定需要切换的承载；所述 MME向 SGW 发送至少一个修改承载请求消息，所述至少一个修改承载请求消息中携带的承载 上下文， 只包括所述需要切换的承载上下文， 或者所述至少一个修改承载请求消 息包括第一指示信息， 该第一指示信息指示需要切换的承载。 SGW可以接收移动 性管理实体 MME发送的至少一个修改承载请求消息， 仅对需要切换的承载向所述 源基站发送所述 End Marker消息。 所述源基站和目标基站的过程与上述匹配 F-TEID或基站地址的方案一致， 不再赘述。
对应的， 所述 MME的接收单元， 用于接收承载切换消息， 包括：
接收单元， 用于接收所述源基站发送的 E-RAB修改指示消息； 所述 E-RAB修 改指示消息包括第二指示信息， 所述第二指示信息指示需要切换的承载；
所述处理单元， 用于根据所述承载切换消息确定所述所有的承载中需要切 换的承载， 以使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker 消息， 包括：
处理单元， 用于根据所述 E-RAB修改指示消息中的第二指示信息， 确定需要 切换的承载；
发送单元， 用于向 SGW发送至少一个修改承载请求消息， 所述至少一个修改 承载请求消息中携带的承载上下文， 只包括所述需要切换的承载上下文， 或者所 述至少一个修改承载请求消息包括第一指示信息，该第一指示信息指示需要切换 的承载。
通过在 E-RAB修改指示消息中增加第二指示信息来确定需要切换的承载，可 以不需要 MME做另外的匹配动作， 节约运算资源。
与第二实施例类似的， 源基站通知 MME的 E-RAB修改指示消息中的第二指示 信息可以采取不同的粒度， 包括： E-RAB修改指示消息包含一个第二指示信息， 所述第二指示信息指示所述 E-RAB修改指示消息中的所有承载为需要切换的承载， 或者所述 E-RAB修改指示消息包含多个第二指示信息，其中所述 E-RAB修改指示消 息中的每个承载对应一个第二指示信息，每个指示信息指示所对应的承载是否需 要切换。上述两种方案都可以指示需要切换的承载。第一种方案使用一个指示信 息指示多个承载， 可以节省信令； 采用第二种方案可以准确指示每一个承载是否 需要切换， 指示更准确。
与第一实施例相同 MME通知 SGW的修改承载请求消息中的第一指示信息也可 以采取不同的粒度。 具体地， 本实施例的网络设备中， 所述修改承载请求消息每 个修改承载请求消息包含一个第一指示信息，所述第一指示信息指示所述修改承 载请求中的所有承载为需要切换的承载，或者所述至少一个修改承载请求消息的 每个修改承载请求消息包含多个第一指示信息，其中所述修改承载请求中的每个 承载对应一个第一指示信息， 每个指示信息指示所对应的承载是否需要切换。
第四实施例
本发明的实施例提供一种承载切换的控制方法。 所述方法适用于无线通信 系统， 所述系统包括网络侧设备、 源基站、 目标基站和用户设备， 所述用户设备 与所述源基站之间的所有承载的至少一部分需要从所述源基站切换到所述目标 基站。 如图 9所示， 所述方法包括如下步骤：
901， 所述网络侧设备接收承载切换消息；
902，所述网络侧设备根据所述承载切换消息确定所述所有承载中需要切换 的承载， 以使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker 消息。
通过上述方案，针对多连接的场景，网络侧设备可以确定需要切换的承载， 使得仅对需要切换的承载才发送结束标记消息，可以避免非切换承载的后续数据 的丢弃， 保证了 UE与基站之间的多连接， 进而提高系统的稳定性。
所述承载的建立过程与第一实施例一致， 不再赘述。
第五实施例 本实施例介绍该网络侧设备为 SGW的控制方法。
本实施的原理以及相关实体的详细说明参见第二实施例， 不再赘述。
如图 10所示， 本实施例提供的控制方法， 所述网络侧设备为服务网关 SGW， 包括，
1001 ,所述 SGW接收移动性管理实体 MME发送的至少一个修改承载请求消息， 所述至少一个修改承载请求消息中包括的承载上下文对应所述所有承载；
1002， 所述 SGW根据所述至少一个修改承载请求消息中的承载上下文， 确定 需要切换的承载；
1003，所述 SGW仅对需要切换的承载向所述源基站发送所述 End Marker消息。 通过上述方案， 针对多连接的场景， SGW可以确定需要切换的承载， 使得仅 对需要切换的承载才发送结束标记消息，可以避免非切换承载的后续数据的丢弃， 保证了 UE与基站之间的多连接， 进而提高系统的稳定性。
进一步地， 所述至少一个修改承载请求消息中包含的承载上下文中含有 F-TEID。 具体原理参见第二实施例。
对应的本实施例的控制方法中，所述 SGW根据所述至少一个修改承载请求消 息中的承载上下文， 确定需要切换的承载， 包括：
所述 SGW将所述至少一个修改承载请求消息中的承载上下文中的 F-TEID与 当前自身存储的承载上下文中的 F-TEID匹配， 当一个承载的 F-TEID发生变化时， 确定所述承载为需要切换的承载； 或者
所述 SGW将所述至少一个修改承载请求消息中的承载上下文中的基站地址 与当前自身存储的承载上下文中的基站地址匹配，当一个承载的基站地址发生变 化时， 确定所述承载为需要切换的承载。
进一步地， 所述 SGW可以保留不需要切换的承载上下文。 这样 SGW可以保持 原承载的正常通信。 通过匹配 F-TEID或者基站地址的变化就可以确定需要切换的承载， 不需要 额外增加新的信令， 就可以满足多连接的场景要求。
作为另一种可能的实现方式，所述 SGW可以不用匹配 F-TEID或者基站地址的 变化来获得需要切换的承载。所述 SGW可以通过指示信息来指示需要切换的承载。 具体原理见第二实施例。
对应的， 本实例的控制方法中， 所述网络侧设备为服务网关 SGW， 其中， 所 述网络侧设备接收承载切换消息， 包括：
所述 SGW接收移动性管理实体 MME发送的至少一个修改承载请求消息， 所述 修改承载请求消息包括第一指示信息， 所述第一指示信息指示需要切换的承载； 所述网络侧设备根据所述承载切换消息确定所述所有承载中需要切换的承 载， 以使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker消息， 包括：
所述 SGW根据所述至少一个修改承载请求消息中的第一指示信息，确定需要 切换的承载；
所述 SGW仅对需要切换的承载向所述源基站发送所述 End Marker消息。 通过在修改承载请求消息中增加第一指示信息来确定需要切换的承载， 可 以不需要 SGW做另外的匹配动作， 节约运算资源。
MME通知 SGW的修改承载请求消息中的第一指示信息可以采取不同的粒度， 包括： 一个修改承载请求消息包含一个第一指示信息， 所述第一指示信息指示所 述修改承载请求中的所有承载为需要切换的承载；或者所述至少一个修改承载请 求消息的每个修改承载请求消息包含多个第一指示信息，其中所述修改承载请求 中的每个承载对应一个第一指示信息，每个指示信息指示所对应的承载是否需要 切换。上述两种方案都可以指示需要切换的承载。第一种方案使用一个指示信息 指示多个承载， 可以节省信令； 采用第二种方案可以准确指示每一个承载是否需 要切换， 指示更准确。
进一步地， 所述 SGW可以保留不需要切换的承载上下文。 这样 SGW可以保持 原承载的正常通信。
第六实施例
本实施例介绍该网络侧设备为 MME的控制方法。
本实施的原理以及相关实体的详细说明参见第三实施例， 不再赘述。
需要注意的是， 在本实施例中， MME在承载建立后， 要存储所有承载的承载 上下文。对应的， SGW不删除 MME传来的修改承载请求消息中未包含的承载的上下 文， 将这部分承载作为不需要切换的承载进行保留。
如图 11所示，本实施例的控制方法，所述网络侧设备为移动性管理实体 MME， 包括：
1101， 所述 MME接收所述源基站发送的 E-RAB修改指示消息； 所述 E-RAB修改 指示消息包括的承载上下文对应所述所有承载；
1102， 所述 MME根据所述 E-RAB修改指示消息中的承载上下文确定需要切换 的承载；
1103， 所述 MME向 SGW发送修改承载请求消息， 所述修改承载请求消息中携 带的承载上下文， 只包括所述需要切换的承载上下文。
对应地， SGW的控制方法为：
接收修改承载请求消息， 所述修改承载请求消息指示需要切换的承载以及 需要切换的承载的上下文；
根据所述修改承载请求消息针对需要切换的承载产生 End Marker消息； 对需要切换的承载发送 End Marker消息。
进一步地， 所述 SGW的控制方法， 还包括： SGW保留不需要切换的承载上下 文。 通过上述方案，针对多连接的场景， MME可以确定需要切换的承载，使得 SGW 可以仅对需要切换的承载才发送结束标记消息，可以避免非切换承载的后续数据 的丢弃， 保证了 UE与基站之间的多连接， 进而提高系统的稳定性。
进一步地， 所述 E-RAB修改指示消息中包含的承载上下文中含有 F-TEID。 具 体原理参见第三实施例。
对应的本实施例的控制方法中， 所述 MME根据所述 E-RAB修改指示消息中的 承载上下文确定需要切换的承载， 包括：
所述 MME将所述 E-RAB修改指示消息中的所有承载的承载上下文中的 F-TEID 与当前存储的承载上下文的 F-TEID匹配， 当一个承载的 F-TEID发生变化时， 确定 所述承载为需要切换的承载； 或者
所述 MME将所述 E-RAB修改指示消息中的所有承载的承载上下文中的目标基 站地址与当前自身存储的承载上下文中的基站地址匹配，当一个承载的基站地址 发生变化时， 确定所述承载为需要切换的承载。
通过匹配 F-TEID或者基站地址的变化就可以确定需要切换的承载， 不需要 额外增加新的信令， 就可以满足多连接的场景要求。
作为另一种可能的实现方式， 与第一实施例中类似的， 所述 MME可以不用匹 配 F-TEID或者基站地址的变化来获得需要切换的承载。 所述 MME可以通过指示信 息来指示需要切换的承载。 具体原理见第三实施例。
对应的， 本实例的控制方法中， 所述网络侧设备为移动性管理实体 MME， 其 中：
所述网络侧设备接收承载切换消息， 包括： 所述 MME接收所述源基站发送的 E-RAB修改指示消息； 所述 E-RAB修改指示消息包括第二指示信息， 所述第二指示 信息指示需要切换的承载；
所述网络侧设备根据所述承载切换消息确定所述所有的承载中需要切换的 承载， 以使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker消息， 包括：
所述 MME根据所述 E-RAB修改指示消息中的第二指示信息， 确定需要切换的 承载；
所述 MME向 SGW发送至少一个修改承载请求消息， 所述至少一个修改承载请 求消息中携带的承载上下文， 只包括所述需要切换的承载上下文， 或者所述至少 一个修改承载请求消息包括第一指示信息，该第一指示信息指示需要切换的承载。
通过在 E-RAB修改指示消息中增加第二指示信息来确定需要切换的承载，可 以不需要 MME做另外的匹配动作， 节约运算资源。
与第三实施例类似的， 源基站通知 MME的 E-RAB修改指示消息中的第二指示 信息可以采取不同的粒度， 包括： 所述 E-RAB修改指示消息包含一个第二指示信 息，所述指示信息指示所述 E-RAB修改指示消息中的所有承载为需要切换的承载， 或者所述 E-RAB修改指示消息包含多个第二指示信息，其中所述 E-RAB修改指示消 息中的每个承载对应一个第二指示信息，每个指示信息指示所对应的承载是否需 要切换。上述两种方案都可以指示需要切换的承载。第一种方案使用一个指示信 息指示多个承载， 可以节省信令； 采用第二种方案可以准确指示每一个承载是否 需要切换， 指示更准确。
与第一实施例相同 MME通知 SGW的修改承载请求消息中的第一指示信息也可 以采取不同的粒度。 具体地， 本实施例中的控制方法中， 所述修改承载请求消息 每个修改承载请求消息包含一个第一指示信息，所述第一指示信息指示所述修改 承载请求中的所有承载为需要切换的承载，或者所述至少一个修改承载请求消息 的每个修改承载请求消息包含多个第一指示信息，其中所述修改承载请求中的每 个承载对应一个第一指示信息，每个第一指示信息指示所对应的承载是否需要切 换。 第七实施例
以上实施例主要是针对 SGW或者 MME进行的改进。 下面介绍源基站的技术方 案。 该方案同样可以实现在多连接场景下的承载控制。
如第二实施例中描述的那样， UE与源基站保持通信， 并根据承载的情况准 备将一部分承载切换到目标基站。 具体地， 源基站可以通过 UE或者源基站的 Qos 或者他们之间的负载情况等参数来确定需要切换的承载。 本实施例中， 源基站、 MME、 SGW所获得的承载上下文对应所有承载。 相应地， 所述 SGW所发送的 End Marker消息对应于所有承载，即包括需要切换的承载，也包括不需要切换的承载。 本实施例中， 源基站可以根据其确定的需要切换的承载， 将不需要切换的承载对 应的 End Marker消息丢弃。 这样， 不需要切换的承载被保留， UE继续在源基站的 承载进行通信。 对应的， 源基站将 End Marker消息转发给目标基站。 这部分转发 的 End Marker消息对应的是需要切换的承载。 目标基站收到该消息后可以确认需 要切换的承载已经由源基站发送完毕，开始目标基站与对应 UE和网络侧设备的通 信。
对应地， 本实施例提供一种基站， 用于承载切换。 所述基站属于无线通信 系统， 所述系统包括 SGW、 目标基站， 用户设备与所述基站的所有承载的至少一 部分需要从所述基站切换到所述目标基站， 所述基站包括：
接收单元， 用于接收 SGW发送的 End Marker消息， 所述 End Marker消息为所 有承载对应的 End Marker消息；
处理单元， 用于确定需要切换的承载，
还用于根据所确定的需要切换的承载， 将不需要切换的承载对应的 End Marker消息丢弃。
进一步地， 所述基站还可以包括发送单元， 用于将需要切换的承载对应的 End Marker消息转发给目标基站。 可选地， 所述需要切换的承载上下文， 可以存储在该基站的存储器中。 具体地， 所述基站的处理单元， 用于将 End Marker消息对应的承载与所确 定的需要切换的承载进行匹配， 当二者不一致时， 将这个承载对应的 End Marker 消息丢弃。 当二者一致时， 将这个承载对应的 End Marker消息转发给目标基站。 这样， 所述基站就会保留不需要切换的承载， 从而不会造成通信断路。
另外， 本实施例提供一种基站， 用于承载切换。 所述基站属于无线通信系 统， 所述系统包括 SGW、 目标基站， 用户设备与所述基站的所有承载的至少一部 分需要从所述基站切换到所述目标基站， 所述基站包括：
接收机， 用于接收 SGW发送的 End Marker消息， 所述 End Marker消息为所有 承载对应的 End Marker消息；
处理器， 用于确定需要切换的承载，
还用于根据所确定的需要切换的承载， 将不需要切换的承载对应的 End Marker消息丢弃。
进一步地， 所述基站还包括发射机， 用于将需要切换的承载对应的 End Marker消息转发给目标基站。
可选地， 所述需要切换的承载上下文， 可以存储在该基站的存储器中。 具体地， 所述基站的处理单元， 用于将 End Marker消息对应的承载与所确 定的需要切换的承载进行匹配， 当二者不一致时， 将这个承载对应的 End Marker 消息丢弃。 当二者一致时， 将这个承载对应的 End Marker消息转发给目标基站。 这样， 所述基站就会保留不需要切换的承载， 从而不会造成通信断路。
本实施例提供一种基站所使用的控制方法。所述方法适用于无线通信系统， 所述系统包括 SGW、 源基站和目标基站， 用户设备与所述源基站的所有承载的至 少一部分需要从所述源基站切换到所述目标基站， 所述方法包括如下步骤： 所述源基站接收 End Marker消息， 所述 End Marker消息为所述所有承载对 应的 End Marker消息；
所述源基站确定需要切换的承载，
所述源基站根据所确定的需要切换的承载，将不需要切换的承载对应的 End Marker消息丢弃。
进一步地，可以将需要切换的承载对应的 End Marker消息转发给目标基站。 具体地， 所述源基站将 End Marker消息对应的承载与所确定的需要切换的 承载进行匹配， 当二者不一致时， 将这个承载对应的 End Marker消息丢弃。 当二 者一致时， 将这个承载对应的 End Marker消息转发给目标基站。 这样， 源基站就 会保留不需要切换的承载， 从而不会造成通信断路。
通过上述方案， 针对多连接的场景， 所述基站可以确定需要切换的承载， 丢弃不需要切换的承载所对应的结束标记消息，可以避免非切换承载的后续数据 的丢弃， 保证了 UE与基站之间的多连接， 进而提高系统的稳定性。
第八实施例
本实施例同样是源基站的改进方案。 该方案同样可以实现在多连接场景下 的承载控制。
如第二实施例中描述的那样， UE与源基站保持通信， 并根据承载的情况准 备将一部分承载切换到目标基站。 具体地， 源基站可以通过 UE或者源基站的 Qos 或者他们之间的负载情况等参数来确定需要切换的承载。本实施例中， 源基站仅 将需要切换的承载所对应的 E-RAB修改指示消息发送给 MME。 相应地， MME根据所 述 E-RAB修改指示消息发送修改承载请求给 SGW，所述修改承载请求只对应需要切 换的承载； SGW根据所述修改承载请求发送 End Marker消息给所述源基站， 所述 End Marker消息只对应需要切换的承载； 需要注意的， SGW和 /或 MME需要保留不 需要切换的承载的上下文。所述源基站收到的所述 End Marker消息仅对应于需要 切换的承载， 不包括不需要切换的承载。对应地， 所述源基站保留了不需要切换 的承载， 并停止需要切换的承载的后续报文。源基站通过将需要切换的承载转移 到目标基站。 源基站也可以将收到的所述 End Marker消息转发给目标基站， 目标 基站收到该消息后可以确认需要切换的承载已经由源基站发送完毕，开始目标基 站与对应 UE和网络侧设备的通信。
对应地， 本实施例提供一种基站， 用于承载切换。 所述基站属于无线通信 系统， 所述系统包括 SGW、 MME和目标基站， 用户设备与所述基站的所有承载的至 少一部分需要从所述源基站切换到所述目标基站， 所述基站包括：
接收单元， 用于确定需要切换的承载；
发送单元， 用于发送 E-RAB修改指示消息给所述 MME， 所述 E-RAB修改指示消 息只包括所述需要切换的承载的上下文；
所述接收单元，还用于接收所述 SGW发送的 End Marker消息，所述 End Marker 消息只对应需要切换的承载。
进一步地， 所述基站的发送单元， 还用于将需要切换的承载对应的 End Marker消息转发给目标基站。
另外， 本实施例提供一种基站， 用于承载切换。 所述基站属于无线通信系 统， 所述系统包括 SGW、 MME和目标基站， 用户设备与所述基站的所有承载的至少 一部分需要从所述源基站切换到所述目标基站， 所述基站包括：
接收机， 用于确定需要切换的承载；
发射机， 用于发送 E-RAB修改指示消息给所述 MME， 所述 E-RAB修改指示消息 只包括所述需要切换的承载的上下文；
所述接收机， 还用于接收所述 SGW发送的 End Marker消息， 所述 End Marker 消息只对应需要切换的承载。
进一步地，所述基站的发射机，还用于将需要切换的承载对应的 End Marker 消息转发给目标基站。
本实施例提供一种基站所使用的控制方法。所述方法适用于无线通信系统， 所述系统包括 SGW、 MME、源基站和目标基站， 所述用户设备与所述源基站的所有 承载的至少一部分需要从所述源基站切换到所述目标基站，所述方法包括如下步 骤：
所述源基站确定需要切换的承载；
所述源基站发送 E-RAB修改指示消息给所述 MME，所述 E-RAB修改指示消息只 包括所述需要切换的承载的上下文；
所述源基站接收所述 SGW发送的 End Marker消息， 所述 End Marker消息只对 应需要切换的承载。 进一步地， 可以将需要切换的承载对应的 End Marker消息转 发给目标基站。
对应地， 本实施例提供一种通信系统， 用于承载切换。 所述系统包括 SGW、 MME、 源基站、 目标基站， 用户设备与所述源基站的所有承载的至少一部分需要 从所述源基站切换到所述目标基站， 所述源基站为本实施例中的所述基站。
因为只有需要切换的承载才产生 End Marker消息， 而不需要切换的承载不 会产生对应的 End Marker消息， 从而不需要切换的承载不会造成通信断路。 通过 上述方案， 针对多连接的场景， 源基站可以避免非切换承载的后续数据的丢弃， 保证了 UE与基站之间的多连接， 进而提高系统的稳定性。
第九实施例
本发明的实施例提供一种网络侧设备， 用于控制承载切换。 所述网络侧设 备属于无线通信系统， 所述系统还包括源基站和目标基站， 用户设备与所述源基 站之间的所有承载的至少一部分需要从所述源基站切换到所述目标基站。如图 12 所示， 所述网络侧设备 1200包括：
接收机 1203， 用于接收承载切换消息； 处理器 1201， 用于根据所述承载切换消息确定所述所有承载中需要切换的 承载， 以使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker消息。
本实施例中， 处理器 1201可以完成第一实施例中处理单元的所有功能， 或 者执行相同的步骤； 接收机 1203， 可以完成第一实施例中接收单元的所有功能， 或者执行相同的步骤。 所述处理器、 接收机连接关系与第一实施例的处理单元、 接收单元的连接关系一致。本实施例是与第一实施例相似的装置权利要求， 可以 实现与第一实施例的相似的效果， 不再赘述。
通过上述方案，针对多连接的场景，网络侧设备可以确定需要切换的承载， 使得仅对需要切换的承载才发送结束标记消息，可以避免非切换承载的后续数据 的丢弃， 保证了 UE与基站之间的多连接， 进而提高系统的稳定性。
第十实施例
本实施例介绍该网络侧设备为 SGW的技术方案。
如图 13所示， 所述 SGW 1300可以包括： 接收机 1303， 用于接收移动性管理 实体 MME发送的至少一个修改承载请求消息， 所述至少一个修改承载请求消息中 包括的承载上下文对应所述所有承载；
处理器 1301， 用于根据所述至少一个修改承载请求消息中的承载上下文， 确定需要切换的承载；
发射机 1302， 用于仅对需要切换的承载向所述源基站发送所述 End Marker 消息。
本实施例中， 处理器 1301可以完成第二实施例中处理单元的所有功能， 或者 执行相同的步骤； 接收机 1303， 可以完成第二实施例中接收单元的所有功能， 或 者执行相同的步骤； 发射机 1302， 可以完成第二实施例中接收单元的所有功能， 或者执行相同的步骤。所述处理器、接收机、 发射机的连接关系与第二实施例的 处理单元、接收单元、 发送单元的连接关系一致。本实施例是与第二实施例相似 的装置权利要求， 可以实现与第二实施例的相似的效果， 不再赘述。
通过上述方案，针对多连接的场景， SGW可以确定需要切换的承载，从而 SGW 仅对需要切换的承载才发送结束标记消息，可以避免非切换承载的后续数据的丢 弃， 保证了 UE与基站之间的多连接， 进而提高系统的稳定性。
第十一实施例
本实施例介绍该网络侧设备为 MME的技术方案。
如图 14所示， 所述 MME 1400可以包括：
接收机 1403， 用于接收所述源基站发送的 E-RAB修改指示消息； 所述 E-RAB 修改指示消息包括的承载上下文对应所述所有承载；
处理器 1401，用于根据所述 E-RAB修改指示消息中的承载上下文确定需要切 换的承载；
发射机 1402， 用于向 SGW发送修改承载请求消息， 所述修改承载请求消息中 携带的承载上下文， 只包括所述需要切换的承载的承载上下文。
本实施例中， 处理器 1401可以完成第三实施例中处理单元的所有功能， 或 者执行相同的步骤； 接收机 1403， 可以完成第三实施例中接收单元的所有功能， 或者执行相同的步骤；发射机 1402，可以完成第三实施例中接收单元的所有功能， 或者执行相同的步骤。所述处理器、接收机、 发射机的连接关系与第三实施例的 处理单元、接收单元、 发送单元的连接关系一致。本实施例是与第三实施例相似 的装置权利要求， 可以实现与第三实施例的相似的效果， 不再赘述。
通过上述方案，针对多连接的场景， MME可以确定需要切换的承载，使得 SGW 可以仅对需要切换的承载才发送结束标记消息，可以避免非切换承载的后续数据 的丢弃， 保证了 UE与基站之间的多连接， 进而提高系统的稳定性。 本领域普通技术人员可以意识到， 结合本文中所公开的实施例中描述的各 方法步骤和单元， 能够以电子硬件、 计算机软件或者二者的结合来实现， 为了清 楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地描述了各 实施例的步骤及组成。这些功能究竟以硬件还是软件方式来执行， 取决于技术方 案的特定应用和设计约束条件。本领域普通技术人员可以对每个特定的应用来使 用不同方法来实现所描述的功能， 但是这种实现不应认为超出本发明的范围。 当 使用软件实现时，可以将上述功能存储在计算机可读介质中或作为计算机可读介 质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和 通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任 何介质。 存储介质可以是计算机能够存取的任何可用介质。 以此为例但不限于： 计算机可读介质可以包括 RAM、 ROM, EEPR0M、 CD-ROM或其他光盘存储、 磁盘存储 介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的 期望的程序代码并能够由计算机存取的任何其他介质。此外。任何连接可以适当 的成为计算机可读介质。 例如， 如果软件是使用同轴电缆、 光纤光缆、 双绞线、 数字用户线 （DSL) 或者诸如红外线、 无线电和微波之类的无线技术从网站、 月艮 务器或者其他远程源传输的， 那么同轴电缆、 光纤光缆、 双绞线、 DSL或者诸如 红外线、无线和微波之类的无线技术包括在所属介质的定影中。如本发明所使用 的， 盘 （Disk)和碟 （disc )包括压缩光碟 （CD) 、 激光碟、 光碟、 数字通用光 碟 （DVD) 、 软盘和蓝光光碟， 其中盘通常磁性的复制数据， 而碟则用激光来光 学的复制数据。 上面的组合也应当包括在计算机可读介质的保护范围之内。
尽管通过参考附图并结合优选实施例的方式对本发明进行了详细描述， 但 本发明并不限于此。在不脱离本发明的精神和实质的前提下， 本领域普通技术人 员可以对本发明的实施例进行各种等效的修改或替换，而这些修改或替换都应在 本发明的涵盖范围内。

Claims

权 利 要 求
1.一种网络侧设备， 其特征在于， 用于控制承载切换， 所述网络侧设备属 于无线通信系统， 所述系统还包括源基站和目标基站， 用户设备与所述源基站之 间的所有承载的至少一部分需要从所述源基站切换到所述目标基站，所述网络侧 设备包括：
接收单元， 用于接收承载切换消息；
处理单元， 用于根据所述承载切换消息确定所述所有承载中需要切换的承 载， 以使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker消息。
2.如权利要求 1所述的网络侧设备， 其特征在于， 所述网络侧设备为服务网 关 SGW， 其中，
所述接收单元， 用于接收承载切换消息， 包括： 所述 SGW的接收单元， 用于 接收移动性管理实体 MME发送的至少一个修改承载请求消息， 所述至少一个修改 承载请求消息中包括的承载上下文对应所述所有承载；
所述处理单元， 用于根据所述承载切换消息确定所述所有承载中需要切换 的承载， 以使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker 消息， 包括：
所述 SGW的处理单元，用于根据所述至少一个修改承载请求消息中的承载上 下文， 确定需要切换的承载；
所述 SGW进一步包括发送单元，用于仅对需要切换的承载向所述源基站发送 所述 End Marker消息。
3， 如权利要求 2所述的网络侧设备， 所述 SGW的处理单元， 用于根据所述至 少一个修改承载请求消息中的承载上下文， 确定需要切换的承载， 包括：
用于将所述至少一个修改承载请求消息中的承载上下文中的全称隧道端点 标识 F-TEID与当前自身存储的承载上下文中的 F-TEID匹配，当一个承载的 F-TEID 发生变化时， 确定所述承载为需要切换的承载； 或者
用于将所述至少一个修改承载请求消息中的承载上下文中的基站地址与当 前自身存储的承载上下文中的基站地址匹配，当一个承载的基站地址发生变化时， 确定所述承载为需要切换的承载。
4.如权利要求 1所述的网络侧设备， 其特征在于， 所述网络侧设备为服务网 关 SGW， 其中，
所述接收单元， 用于接收承载切换消息， 包括： 所述 SGW的接收单元， 用于 接收移动性管理实体 MME发送的至少一个修改承载请求消息， 所述修改承载请求 消息包括第一指示信息， 所述第一指示信息指示需要切换的承载；
所述处理单元， 用于根据所述承载切换消息确定所述所有承载中需要切换 的承载， 以使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker 消息， 包括：
所述 SGW的处理单元，用于根据所述至少一个修改承载请求消息中的第一指 示信息， 确定需要切换的承载；
所述 SGW进一步包括发送单元，用于仅对需要切换的承载向所述源基站发送 所述 End Marker消息。
5. 如权利要求 4所述的网络侧设备， 其特征在于，
所述至少一个修改承载请求消息的每个修改承载请求消息包含一个第一指 示信息，所述第一指示信息指示所述修改承载请求中的所有承载为需要切换的承 载， 或者
所述至少一个修改承载请求消息的每个修改承载请求消息包含多个第一指 示信息， 其中所述修改承载请求中的每个承载对应一个第一指示信息， 每个指示 信息指示所对应的承载是否需要切换。
6. 如权利要求 2-5之一的网络侧设备， 其特征在于， 所述 SGW的处理单元， 还用于保留不需要切换的承载上下文。
7. 如权利要求 1所述的网络侧设备， 其特征在于， 所述网络侧设备为移动 性管理实体 MME， 其中：
所述接收单元， 用于接收承载切换消息， 包括： 所述 MME的接收单元， 用于 接收所述源基站发送的演进的通用陆基无线接入网无线接入承载 E-RAB修改指示 消息； 所述 E-RAB修改指示消息包括的承载上下文对应所述所有承载；
所述处理单元， 用于根据所述承载切换消息确定所有的承载中需要切换的 承载， 以使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker消息， 包括：
所述 MME的处理单元， 用于根据所述 E-RAB修改指示消息中的承载上下文确 定需要切换的承载；
所述 MME进一步包括发送单元， 用于向 SGW发送修改承载请求消息， 所述修 改承载请求消息中携带的承载上下文，只包括所述需要切换的承载的承载上下文。
8. 如权利要求 7所述的网络侧设备， 所述 MME的处理单元， 用于根据所述
E-RAB修改指示消息中的承载上下文确定需要切换的承载， 包括：
用于将所述 E-RAB修改指示消息中的所有承载的承载上下文中的 F-TEID与 当前存储的承载上下文的 F-TEID匹配， 当一个承载的 F-TEID发生变化时， 确定所 述承载为需要切换的承载； 或者
用于将所述 E-RAB修改指示消息中的所有承载的承载上下文中的基站地址 与当前自身存储的承载上下文中的基站地址匹配，当一个承载的基站地址发生变 化时， 确定所述承载为需要切换的承载。
9.如权利要求 1所述的网络侧设备， 其特征在于， 所述网络侧设备为移动性 管理实体 MME， 其中： 所述接收单元， 用于接收承载切换消息， 包括： 所述 MME的接收单元， 用于 接收所述源基站发送的 E-RAB修改指示消息；所述 E-RAB修改指示消息包括第二指 示信息， 所述第二指示信息指示需要切换的承载；
所述处理单元， 用于根据所述承载切换消息确定所述所有的承载中需要切 换的承载， 以使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker 消息， 包括：
所述 MME的处理单元，用于根据所述 E-RAB修改指示消息中的第二指示信息， 确定需要切换的承载；
所述 MME进一步包括发送单元，用于向 SGW发送至少一个修改承载请求消息， 所述至少一个修改承载请求消息中携带的承载上下文，只包括所述需要切换的承 载上下文， 或者所述至少一个修改承载请求消息包括第一指示信息， 该第一指示 信息指示需要切换的承载。
10. 如权利要求 9所述的网络侧设备， 其特征在于，
所述 E-RAB修改指示消息包含一个第二指示信息，所述第二指示信息指示所 述 E-RAB修改指示消息中的所有承载为需要切换的承载， 或者
所述 E-RAB修改指示消息包含多个第二指示信息， 其中所述 E-RAB修改指示 消息中的每个承载对应一个第二指示信息，每个指示信息指示所对应的承载是否 需要切换。
11. 如权利要求 7-10之一所述的网络设备， 其特征在于，
所述至少一个修改承载请求消息的每个修改承载请求消息包含一个第一指 示信息，所述第一指示信息指示所述修改承载请求中的所有承载为需要切换的承 载， 或者
所述至少一个修改承载请求消息的每个修改承载请求消息包含多个第一指 示信息， 其中所述修改承载请求中的每个承载对应一个第一指示信息， 每个指示 信息指示所对应的承载是否需要切换。
12.—种承载切换的控制方法，其特征在于，所述方法适用于无线通信系统， 所述系统包括网络侧设备、源基站和目标基站， 用户设备与所述源基站之间的所 有承载的至少一部分需要从所述源基站切换到所述目标基站，所述方法包括如下 步骤：
所述网络侧设备接收承载切换消息；
所述网络侧设备根据所述承载切换消息确定所述所有承载中需要切换的承 载， 以使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker消息。
13.如权利要求 12所述的控制方法，所述网络侧设备为服务网关 SGW，其中， 所述网络侧设备接收承载切换消息，包括：所述 SGW接收移动性管理实体 MME 发送的至少一个修改承载请求消息，所述至少一个修改承载请求消息中包括的承 载上下文对应所述所有承载；
所述网络侧设备根据所述承载切换消息确定所述所有承载中需要切换的承 载， 以使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker消息， 包括：
所述 SGW根据所述至少一个修改承载请求消息中的承载上下文，确定需要切 换的承载；
所述 SGW仅对需要切换的承载向所述源基站发送所述 End Marker消息。
14， 如权利要求 13所述的控制方法， 所述 SGW根据所述至少一个修改承载请 求消息中的承载上下文， 确定需要切换的承载， 包括：
所述 SGW将所述至少一个修改承载请求消息中的承载上下文中的全称隧道 端点标识 F-TEID与当前自身存储的承载上下文中的 F-TEID匹配， 当一个承载的 F-TEID发生变化时， 确定所述承载为需要切换的承载； 或者
所述 SGW将所述至少一个修改承载请求消息中的承载上下文中的基站地址 与当前自身存储的承载上下文中的基站地址匹配，当一个承载的基站地址发生变 化时， 确定所述承载为需要切换的承载。
15.如权利要求 12所述的控制方法，所述网络侧设备为服务网关 SGW，其中， 所述网络侧设备接收承载切换消息，包括：所述 SGW接收移动性管理实体 MME 发送的至少一个修改承载请求消息， 所述修改承载请求消息包括第一指示信息， 所述第一指示信息指示需要切换的承载；
所述网络侧设备根据所述承载切换消息确定所述所有承载中需要切换的承 载， 以使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker消息， 包括：
所述 SGW根据所述至少一个修改承载请求消息中的第一指示信息，确定需要 切换的承载；
所述 SGW仅对需要切换的承载向所述源基站发送所述 End Marker消息。
16. 如权利要求 15所述的控制方法， 其特征在于，
所述至少一个修改承载请求消息的每个修改承载请求消息包含一个第一指 示信息，所述第一指示信息指示所述修改承载请求中的所有承载为需要切换的承 载， 或者
所述至少一个修改承载请求消息的的每个修改承载请求消息包含多个第一 指示信息， 其中所述修改承载请求中的每个承载对应一个第一指示信息， 每个第 一指示信息指示所对应的承载是否需要切换。
17. 如权利要求 13-16之一的控制方法， 进一步包括， 所述 SGW保留不需要 切换的承载上下文。
18. 如权利要求 12所述的控制方法，所述网络侧设备为移动性管理实体 MME， 其中：
所述网络侧设备接收承载切换消息， 包括： 所述 MME接收所述源基站发送的 演进的通用陆基无线接入网无线接入承载 E-RAB修改指示消息；所述 E-RAB修改指 示消息包括的承载上下文对应所述所有承载；
所述网络侧设备根据所述承载切换消息确定所有的承载中需要切换的承载， 以使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker消息， 包括： 所述 MME根据所述 E-RAB修改指示消息中的承载上下文确定需要切换的承载； 所述 MME向 SGW发送修改承载请求消息， 所述修改承载请求消息中携带的承 载上下文， 只包括所述需要切换的承载上下文。
19. 如权利要求 18所述的控制方法， 所述 MME根据所述 E-RAB修改指示消息 中的承载上下文确定需要切换的承载， 包括：
所述 MME将所述 E-RAB修改指示消息中的所有承载的承载上下文中的 F-TEID 与当前存储的承载上下文的 F-TEID匹配， 当一个承载的 F-TEID发生变化时， 确定 所述承载为需要切换的承载； 或者
所述 MME将所述 E-RAB修改指示消息中的所有承载的承载上下文中的目标基 站地址与当前自身存储的承载上下文中的基站地址匹配，当一个承载的基站地址 发生变化时， 确定所述承载为需要切换的承载。
20.如权利要求 12所述的控制方法，所述网络侧设备为移动性管理实体 MME， 其中：
所述网络侧设备接收承载切换消息， 包括： 所述 MME接收所述源基站发送的 E-RAB修改指示消息； 所述 E-RAB修改指示消息包括第二指示信息， 所述第二指示 信息指示需要切换的承载；
所述网络侧设备根据所述承载切换消息确定所述所有的承载中需要切换的 承载， 以使得仅针对需要切换的承载向所述源基站发送结束标记 End Marker消息， 包括：
所述 MME根据所述 E-RAB修改指示消息中的第二指示信息， 确定需要切换的 承载；
所述 MME向 SGW发送至少一个修改承载请求消息， 所述至少一个修改承载请 求消息中携带的承载上下文， 只包括所述需要切换的承载上下文， 或者所述至少 一个修改承载请求消息包括第一指示信息，该第一指示信息指示需要切换的承载。
21. 如权利要求 20所述的控制方法， 其特征在于，
所述 E-RAB修改指示消息包含一个第二指示信息， 所述指示信息指示所述 E-RAB修改指示消息中的所有承载为需要切换的承载， 或者
所述 E-RAB修改指示消息包含多个第二指示信息， 其中所述 E-RAB修改指示 消息中的每个承载对应一个第二指示信息，每个指示信息指示所对应的承载是否 需要切换。
22. 如权利要求 18-21之一所述的控制方法， 其特征在于，
所述修改承载请求消息的每个修改承载请求消息包含一个第一指示信息， 所述第一指示信息指示所述修改承载请求中的所有承载为需要切换的承载，或者 所述至少一个修改承载请求消息的每个修改承载请求消息包含多个第一指 示信息， 其中所述修改承载请求中的每个承载对应一个第一指示信息， 每个第一 指示信息指示所对应的承载是否需要切换。
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