WO2014177090A1 - 一种切换方法、主控基站及受控基站 - Google Patents

一种切换方法、主控基站及受控基站 Download PDF

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Publication number
WO2014177090A1
WO2014177090A1 PCT/CN2014/077788 CN2014077788W WO2014177090A1 WO 2014177090 A1 WO2014177090 A1 WO 2014177090A1 CN 2014077788 W CN2014077788 W CN 2014077788W WO 2014177090 A1 WO2014177090 A1 WO 2014177090A1
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Prior art keywords
senb
menb
handover
target menb
target
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PCT/CN2014/077788
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English (en)
French (fr)
Inventor
和峰
黄亚达
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中兴通讯股份有限公司
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Priority to EP14792000.3A priority Critical patent/EP3035735B1/en
Priority to US14/910,256 priority patent/US9906994B2/en
Publication of WO2014177090A1 publication Critical patent/WO2014177090A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/16Performing reselection for specific purposes
    • H04W36/22Performing reselection for specific purposes for handling the traffic
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • H04W36/0064Transmission or use of information for re-establishing the radio link of control information between different access points
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • H04W36/0069Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/08Reselecting an access point
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/08Reselecting an access point
    • H04W36/087Reselecting an access point between radio units of access points
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/16Performing reselection for specific purposes
    • H04W36/18Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04Large scale networks; Deep hierarchical networks
    • H04W84/042Public Land Mobile systems, e.g. cellular systems
    • H04W84/045Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • H04W36/0069Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00695Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using split of the control plane or user plane

Definitions

  • the present invention relates to a long term evolution system, and more particularly to a handover method, a master base station, and a controlled base station.
  • LTE Long Term Evolution
  • LTE Advanced enhanced LTE
  • the user plane data protocol stack of the related LTE is as shown in FIG. 1.
  • the downlink data received from the core network through the user plane GPRS Tunneling Protocol (GTP-U, GPRS Tunneling Protocol for the User Plane) is aggregated by the packet data after being unpacked.
  • Protocol Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Media Access Control
  • PHY physical layer
  • UE User Equipment
  • the transmission of uplink data is the opposite of the downlink data.
  • the data transmission link between the network and the UE is a one-to-one dedicated link, so the signal quality of the link and the size of the resources used determine the data transmission performance between the two. If the resources used by the link are limited or the signal quality is poor, the user experience of the UE will decrease. This is a huge challenge that mobile operators are facing now. Although the network capacity is expanding year by year, it still cannot keep up with the increase in the number of user terminals. And the user's demand for data traffic.
  • LPNs low-power nodes
  • a small cell or a micro base station (Pico eNB) is used for hotspot enhancement.
  • the network deployment environment becomes more complex and brings some problems.
  • LPN cells because the coverage of the LPN cell is much smaller than that of the Macro Cell, and the capacity is relatively small, some LPN cells may be easily occupied by users and cause excessive load, thus affecting user data.
  • Throughput while other LPN cells or macro cells will be at a relatively low load level. If the load is to be balanced, the network side needs to perform load balancing operations, but the process is not flexible enough, especially when there are many cells. The uneven load caused by the lack of sex is even more serious.
  • Dual Connectivity is one of them.
  • the dual-connected terminal can simultaneously and two (or more than two, the double connection described in this article is only a generic term, and does not limit the number of connections).
  • the network node remains connected, as shown in Figure 2, where the primary node is called MeNB.
  • SeNB Secondary eNB, generally referred to as a micro base station or a low power node
  • the UE maintains both the macro cell and the LPN cell.
  • Connection when the network load is unbalanced, the network side can adjust the amount of transmission data of the terminal on the MeNB and the SeNB node in real time, and if the UE moves or other reasons cause the SeNB cell to change, another cell can still maintain the connection, and this Changes do not result in excessive signaling impact.
  • the offload anchor may be placed in the serving gateway (S-GW), as shown in FIG. 3(A); or may be placed in the MeNB, if placed in the MeNB, According to its specific shunting level, it continues to be refined into shunting cooperation between different levels, such as shunting on the PDCP layer, shunting between PDCP layers, etc., as shown in Figure 3(B), 3(C), 3 (D), 3(E).
  • the above-mentioned dual-connection method is enhanced when the SeNB changes frequently.
  • all the contexts of the UE are involved, including some configuration information carried on the SeNB, etc., which cannot be performed according to the existing handover method.
  • Switch between dual connections The MeNB can only reclaim the connection bearer on the SeNB, convert it to a single connection, and then after the MeNB handover is completed, The new MeNB reselects the SeNB for offloading. This will increase the probability of data service interruptions and dropped calls, so further optimization is still needed. Summary of the invention
  • the technical problem to be solved by the present invention is to provide a handover method, a master control base station, and a controlled base station, which can implement handover of a master control base station of a UE in a multi-connection scenario of the UE to avoid data service interruption and dropped calls.
  • a handover method of the present invention is applied to a UE handover UE in a multi-connection scenario in which a user equipment UE is connected to a master base station MeNB and a controlled base station SeNB, including:
  • the source MeNB initiates a handover, and after receiving the corresponding response, sends a handover command to the UE, and the handover command instructs the UE to switch the MeNB and maintain the connection with the SeNB; after the UE successfully accesses the target MeNB, The source MeNB or the target MeNB sends a handover indication message to the SeNB connected to the UE, and the SeNB connected by the UE establishes an association with the target MeNB according to the handover indication message.
  • the method further includes:
  • the source MeNB initiates the handover, and the source MeNB sends a handover request message or a handover request message, where the message carries the bearer information on the SeNB connected to the UE and the context configuration information of the bearer on the SeNB.
  • the target MeNB After receiving the bearer information on the SeNB connected to the UE and the context configuration information of the bearer on the SeNB, the target MeNB performs admission admission control according to the bearer information on the SeNB connected to the UE, and saves the SeNB.
  • the context configuration information of the bearer After receiving the bearer information on the SeNB connected to the UE and the context configuration information of the bearer on the SeNB, the target MeNB performs admission admission control according to the bearer information on the SeNB connected to the UE, and saves the SeNB.
  • the context configuration information of the bearer is the context configuration information of the bearer.
  • the method further includes:
  • the source MeNB further carries the identifier information of the SeNB connected by the UE in the sent handover request message or the handover request message;
  • the target MeNB sends a handover indication message to the SeNB connected to the UE
  • the target MeNB sends the handover indication message to the SeNB connected to the UE according to the identifier information of the SeNB connected by the UE.
  • the SeNB that is connected to the UE establishes an association with the target MeNB according to the handover indication message, and includes:
  • the SeNB connected to the UE confirms that the control plane management of the UE has been handed over to the target MeNB according to the UE identity information carried in the handover indication message.
  • the shunt anchor point between the target MeNB and the SeNB connected to the UE is a target
  • the method further includes:
  • the sending, by the source MeNB or the target MeNB, the handover indication message to the SeNB connected to the UE includes: carrying, in the handover indication message, port information of the offload tunnel between the target MeNB and the SeNB connected to the UE;
  • the method further includes: the source MeNB or the target MeNB
  • the sending the handover indication message to the SeNB connected to the UE includes: carrying the context configuration information of the bearer on the target MeNB in the handover indication message.
  • a master control base station includes: a handover request unit, where:
  • the handover requesting unit is configured to: initiate a handover, and after receiving the corresponding response, send a handover command to the user equipment UE, where the handover command is used to instruct the UE to switch to the master base station MeNB, and maintain the controlled base station SeNB connection.
  • the handover requesting unit is configured to: initiate a handover, and include: sending a handover request message or a handover request message, where the message carries the bearer information on the controlled base station SeNB and the context configuration information of the bearer on the SeNB.
  • a master base station includes: a switching unit, where:
  • the switching unit is configured to: after the user equipment UE successfully accesses, send a handover indication message to the controlled base station SeNB connected to the UE, and indicate that the SeNB connected to the UE establishes a target master base station MeNB according to the handover indication message. The association.
  • the handover indication message carries UE identification information;
  • the switching unit is further configured to: when the offload anchor point between the target MeNB and the SeNB connected to the UE is the target MeNB, the handover indication message carries the SeNB of the target MeNB and the UE connected Port information of the split tunnel.
  • the switching unit is further configured to: when the offload anchor point between the target MeNB and the SeNB connected to the UE is the target MeNB, and the protocol layer of the target MeNB is used as the shunt layer, in the handover
  • the indication message also carries the context configuration information of the bearer on the target MeNB.
  • the master control base station further includes a receiving unit and a context configuration processing unit, where: the receiving unit is configured to: after receiving the bearer information on the SeNB connected to the UE, before the UE successfully accesses, Performing admission control according to bearer information on the SeNB connected to the UE;
  • the context configuration processing unit is configured to: after receiving the context configuration information of the bearer on the SeNB, save the context configuration information of the bearer on the SeNB.
  • a controlled base station includes: a receiving unit and an association establishing unit, where:
  • the receiving unit is configured to: receive a handover indication message
  • the association establishing unit is configured to: after the receiving unit receives the handover indication message, establish an association with the target master base station MeNB according to the handover indication message.
  • the association establishing unit is configured to: establish an association with the target MeNB according to the handover indication message, including: determining, according to the handover indication message, that the control information of the UE has been switched to the Target MeNB.
  • the association establishing unit is configured to: establish and target according to the handover indication message
  • the association of the MeNB further includes: when the offload anchor point between the target MeNB and the SeNB is the target MeNB, establishing a split tunnel with the target MeNB according to the port information of the offload tunnel carried in the handover indication message, and When the offload anchor between the target MeNB and the SeNB is the target MeNB, and the protocol layer of the target MeNB is used as the offload layer, the context configuration information of the bearer on the target MeNB carried in the handover indication message is saved. Switching performance at the time. During the handover process, part of the user plane data is not interrupted, and signaling overhead is also saved on the air interface, and the backward compatibility of the protocol is also ensured to the greatest extent. BRIEF abstract
  • FIG. 1 is a schematic diagram of an LTE user plane protocol stack in the related art
  • FIG. 2 is a schematic diagram of a data multi-stream transmission architecture in the related art
  • 3(A) to 3(E) are schematic diagrams of a data offload protocol stack in the related art
  • FIG. 4 is a schematic diagram of a specific implementation scenario of an embodiment of the present application.
  • FIG. 5 is a flowchart of Embodiment 1 of the embodiment of the present application.
  • FIG. 9 is a structural diagram of a main control base station according to an embodiment of the present application.
  • FIG. 10 is a structural diagram of a controlled base station according to an embodiment of the present application. Preferred embodiment of the invention
  • the MeNB1 or the MeNB2 needs to send a handover indication message to the SeNB. That is, when the dual-connected UE performs handover at the MeNB, the connection on the SeNB in the coverage overlap area of the source MeNB and the target MeNB may remain unchanged, and the SeNB re-associates with the target MeNB after the handover is completed.
  • the source MeNB initiates a handover, and after receiving the corresponding response, sends a handover command to the UE, instructs the UE to switch the MeNB through the handover command, and maintains the connection with the SeNB; after the UE successfully accesses the target MeNB, the source MeNB Or the target MeNB sends the SeNB connected to the UE.
  • Sending a handover indication message indicating to the SeNB connected to the UE that the UE has switched from the source MeNB to the target MeNB, and the SeNB connected by the UE establishes association with the target MeNB according to the handover indication message.
  • the source MeNB sends a handover request message to the target MeNB, where the bearer information on the SeNB connected to the UE, the identity information of the SeNB, and the context configuration information of the bearer on the SeNB are carried, and the bearer is configured on the source MeNB. And carrying the bearer information on the source MeNB; the target MeNB sends a handover command and optional data preamble information to the source MeNB, and the source MeNB sends a handover command to the UE, where the UE is instructed to perform only the MeNB handover; the target MeNB confirms the UE.
  • the path switching message is sent to the core network to complete the path switching of the user plane, and the handover indication message is sent to the SeNB. Finally, the SeNB sends a response message to the target MeNB to establish an association between the SeNB and the target MeNB.
  • the target MeNB sends a handover indication message to the SeNB connected to the UE, where the handover indication message carries the UE identity information allocated by the target MeNB for the UE, indicating that the control plane management of the UE has been transferred to the target MeNB;
  • the handover indication message may also carry the target MeNB.
  • the contextual configuration information is transmitted by the target MeNB to the SeNB, and the SeNB can obtain the configuration information of the shunt layer on the MeNB and the configuration information of the upper layer of the shunt layer.
  • the SeNB can obtain the configuration information of the SeNB.
  • the data packet is correctly transmitted, and the bearer on the target MeNB changes with respect to the source MeNB after the UE is switched to the target MeNB.
  • the SeNB cannot obtain the configuration information of the shunt layer on the target MeNB and the configuration information of the upper layer of the shunt layer.
  • the upper layer of the shunt layer and the upper layer of the shunt layer cannot process the data packets sent by the SeNB, so that the data packets of the SeNB cannot be sent normally.
  • the handover indication message may further carry the port information of the offload tunnel between the target MeNB and the SeNB, to establish a relationship between the SeNB and the target MeNB. Diversion tunnel.
  • the SeNB establishes association with the target MeNB, which means that the SeNB confirms that the control plane management of the UE has been transferred to the target MeNB according to the UE identification information in the handover indication message, and the target MeNB manages the SeNB to continue the offload transmission.
  • the sub-target MeNB is connected to the SeNB connected to the UE
  • the flow anchor point is the target MeNB, that is, the SeNB is a traffic offload from the target MeNB
  • the association further includes the SeNB connected by the UE establishing a split tunnel with the target MeNB according to the port information of the split tunnel.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the serving gateway (S-GW) as the offloading anchor point As an example, the bearer user plane of the UE on the MeNB and the SeNB is directly connected to the S-GW, as shown in FIG. 3(A).
  • the source MeNB initiates a handover to the target MeNB, as shown in FIG. 5, including:
  • Step 501 The source MeNB sends a handover request message to the target MeNB, where the bearer information on the SeNB connected to the UE, the identifier information of the SeNB, and the context configuration information of the bearer on the SeNB are carried, and the source MeNB also carries the source MeNB when there is a bearer on the source MeNB. Bearer information;
  • the bearer information includes one or more of the bearer identification information, the bearer quality of service (QoS) parameter, the bearer data preamble information, and the uplink port address information of the service gateway.
  • QoS quality of service
  • the context configuration information of the bearer on the SeNB includes bearer corresponding radio resource control (RRC) configuration information, layer 2 (including PDCP, RLC, and MAC) configuration information, physical layer configuration information, security capability information, and Security key information.
  • RRC radio resource control
  • layer 2 including PDCP, RLC, and MAC
  • Step 502 After receiving the handover request message, the target MeNB performs admission admission control according to the bearer information, and performs bearer context configuration processing according to the context configuration information of the bearer on the SeNB, where the target is consistent with the bearer configuration on the SeNB.
  • the MeNB needs to save the bearer context configuration information on the SeNB in the request message, and after the success, sends a handover response to the source MeNB, where the handover command and the data pre-transmission information are carried;
  • the data preamble information refers to preamble tunnel port information established for performing data forwarding between the source MeNB and the target MeNB.
  • Step 503 After receiving the handover response, the source MeNB establishes a data pre-transmission tunnel with the target MeNB, and performs data pre-transmission, and the source MeNB sends a handover command to the UE, where the handover command instructs the UE to perform only the MeNB handover, and maintains the connection on the SeNB. Do not switch;
  • Step 504 After receiving the handover command, the UE obtains synchronization with the target MeNB, and sends a handover complete message to the target MeNB.
  • Step 505 After the target MeNB confirms that the UE is successfully accessed, it sends a path switch message (ath switch) to the core network, instructing the core network to switch the SI port bearer to the target MeNB.
  • Step 506 The target MeNB sends a handover indication message to the SeNB according to the identifier information of the SeNB, and carries the UE identifier information allocated by the target MeNB for the UE, and is used to indicate that the control plane management of the UE by the SeNB has been transferred to the target MeNB.
  • Step 507 The SeNB updates the locally stored UE context according to the indication, and sends a success response to the target MeNB to complete association between the SeNB and the target MeNB.
  • Step 508 The target MeNB sends a context release message to the source MeNB, indicating that the source MeNB successfully switches, and the corresponding resource may be released.
  • the above procedure takes the X2 handover between the MeNBs as an example. If the S1 handover occurs in practice, the above principle still applies, except that the name and path of the sent message are different.
  • the handover indication message sent to the SeNB may also be sent by the source MeNB.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the MeNB Take the MeNB as the shunt anchor as an example.
  • the data is split on the PDCP layer and sent to the MeNB and the SeNB for transmission, as shown in Figure 3(B).
  • the source MeNB initiates a handover to the target MeNB, as shown in FIG. 6, including:
  • Step 601 The source MeNB sends a handover request message to the target MeNB, where the bearer information on the SeNB connected to the UE, the identity information of the SeNB, and the context configuration information of the bearer on the SeNB are carried.
  • Step 602 After receiving the handover request message, the target MeNB performs the admission admission control and the bearer context configuration process, where the target MeNB needs to save the bearer context configuration on the SeNB in the request message, in order to ensure consistency with the bearer configuration on the SeNB.
  • the handover response is sent to the source MeNB, where the handover command, the data pre-transmission information, and the offload tunnel information and the UE identification information allocated by the target MeNB for the UE are carried;
  • the context configuration information of the bearer on the SeNB includes the bearer corresponding radio resources.
  • Source Control (RRC) configuration information includes the bearer corresponding radio resources.
  • Layer 2 including PDCP, RLC, and MAC
  • physical layer configuration information includes PDCP, RLC, and MAC
  • security capability information includes the context configuration information of the bearer on the SeNB.
  • Step 603 After receiving the handover response, the source MeNB establishes a data pre-transmission tunnel with the target MeNB, and performs data pre-transmission, and the source MeNB sends a handover command to the UE, where the handover command instructs the UE to perform only the MeNB handover, and maintains the connection on the SeNB. Do not switch;
  • Step 604 After receiving the handover command, the UE obtains synchronization with the target MeNB, and sends a handover completion message to the target MeNB.
  • Step 605 The source MeNB sends a handover indication message to the SeNB, and carries the UE identifier information allocated by the target MeNB for the UE, which is used to indicate that the control plane management of the UE of the SeNB has been transferred to the target MeNB; and carries the port information of the offload tunnel;
  • Step 606 After receiving the handover indication message, the SeNB confirms that the control plane management of the UE has been transferred to the target MeNB, and establishes a traffic distribution tunnel with the target MeNB according to the port information of the traffic distribution tunnel, and completes the offloading of the target MeNB to the SeNB, and the SeNB successfully establishes the traffic distribution tunnel. Afterwards, the SeNB sends a success response to the target MeNB to complete the association with the target MeNB.
  • Step 607 The target MeNB sends a path switch message to the core network, instructing the core network to switch the SI port bearer to the target MeNB.
  • Step 608 The target MeNB sends a context release message to the source MeNB, indicating that the source MeNB performs the handover successfully, and the corresponding resource may be released.
  • the above procedure takes the X2 handover between the MeNBs as an example. If the S1 handover occurs in practice, the above principle still applies, except that the name and path of the sent message are different.
  • the handover indication message sent to the SeNB may also be sent by the target MeNB.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • Step 701 The source MeNB sends a handover request message to the target MeNB, where the bearer information on the SeNB connected to the UE, the identifier information of the SeNB, and the context configuration information of the bearer on the SeNB are carried, and the source MeNB also carries the source MeNB when there is a bearer on the source MeNB.
  • the bearer information may also carry a downlink data preamble indication, etc.;
  • the context configuration information of the bearer on the SeNB includes bearer corresponding RRC configuration information and layer 2 (including PDCP, RLC, and MAC) configuration information.
  • Step 702 After receiving the handover request message, the target MeNB performs the admission admission control and the bearer context configuration process, where the target MeNB needs to save the bearer context configuration on the SeNB in the request message, in order to ensure consistency with the bearer configuration on the SeNB.
  • the handover response is sent to the source MeNB, where the handover command and the data pre-transmission information are carried;
  • Step 703 After receiving the handover response, the source MeNB establishes a data pre-transmission tunnel with the target MeNB, and performs data pre-transmission, and the source MeNB sends a handover command to the UE, where the handover command instructs the UE to perform only MeNB handover, and maintains the connection on the SeNB. Do not switch;
  • Step 704 The UE obtains synchronization with the target MeNB after receiving the handover, and sends a handover complete message to the target MeNB.
  • Step 705 After the target MeNB confirms that the UE successfully accesses, the target MeNB sends a context release message to the source MeNB, indicating that the source MeNB successfully switches, and the corresponding resource may be released.
  • Step 706 The target MeNB sends a handover indication message to the SeNB according to the identifier information of the SeNB, and carries the UE identifier information allocated by the target MeNB for the UE, and is used to indicate to the SeNB that the UE is connected that the control plane management of the UE has been transferred to the target MeNB, and Port information carrying the offload tunnel and context configuration information of the bearer on the target MeNB;
  • the context configuration information of the bearer on the target MeNB is, for example, the identifier newly assigned by the target MeNB to the UE.
  • the target MeNB sends the configuration information of the bearer on the MeNB to the SeNB, and the SeNB can obtain the configuration information of the shunt layer on the MeNB and the configuration information of the upper layer of the shunt layer.
  • the SeNB can use the shunt layer on the MeNB.
  • the configuration information and the configuration information of the upper layer of the shunt layer correctly transmit the data packet, and avoid the target MeNB after the UE is switched to the target MeNB.
  • the change occurs with respect to the source MeNB, and the SeNB cannot obtain the configuration information of the shunt layer and the configuration information of the upper layer of the shunt layer on the target MeNB, and the upper layer of the shunt layer and the upper layer of the shunt layer cannot process the data packets sent by the SeNB, so that the SeNB data packet Unable to send properly.
  • the STP on the MeNB is the PDCP layer of the MeNB
  • the target MeNB sends the configuration information of the bearer on the MeNB to the SeNB, so that the SeNB can obtain the configuration information of the PDCP layer on the MeNB.
  • the uplink data of the SeNB needs to be processed by the PDCP layer of the MeNB. Therefore, in order for the SeNB to normally transmit the uplink data, the SeNB needs to know the configuration information of the PDCP layer on the MeNB.
  • the STP on the MeNB is the PDCP layer of the MeNB
  • the target MeNB sends the configuration information of the bearer on the MeNB to the SeNB, so that the SeNB can obtain the configuration information of the PDCP layer on the MeNB.
  • the shunt layer on the MeNB is the RLC layer of the MeNB, and the upper layer of the shunt layer is
  • the target MeNB sends the configuration information of the bearer on the MeNB to the SeNB, and the SeNB can obtain the configuration information of the PDCP layer and the configuration information of the RLC layer on the MeNB.
  • Step 707 After receiving the handover indication message, the SeNB confirms that the control plane management of the UE has been handed over to the target MeNB according to the UE identifier information carried in the handover indication message, and establishes a offload tunnel with the target MeNB according to the port information of the offload tunnel to complete the target MeNB.
  • the offloading to the SeNB updates the locally saved corresponding context configuration according to the context configuration information of the bearer on the target MeNB, completes the association between the SeNB and the target MeNB, and sends a success response to the target MeNB to complete the association between the SeNB and the target MeNB.
  • Step 708 The target MeNB sends a path switch message to the core network, indicating that the core network switches the S1 port bearer to the target MeNB.
  • the above procedure takes the X2 handover between the MeNBs as an example. If the S1 handover occurs in practice, the above principle still applies, except that the name and path of the sent message are different.
  • the handover indication message sent to the SeNB may also be sent by the source MeNB.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • the MeNB Take the MeNB as a shunt anchor as an example, where data is shunted within the RLC layer, MeNB and SeNB.
  • the RLC entities are respectively referred to as the primary RLC and the secondary RLC, and the data is transmitted to the SeNB through the primary RLC for transmission, as shown in FIG. 3(E).
  • the source MeNB initiates a handover to the target MeNB, as shown in FIG. 8, including:
  • Step 801 The source MeNB initiates a handover request message to the core network, where the bearer information on the SeNB connected to the UE, the identifier information of the SeNB, and the context configuration information of the bearer on the SeNB are carried, and the source MeNB also carries the source MeNB when there is a bearer on the source MeNB. Bearer information;
  • the context configuration information of the bearer on the SeNB includes the configuration of the protocol carried on the SeNB side. As shown in FIG. 3(E), the context configuration information of the bearer on the SeNB includes RRC configuration information, RLC configuration information, and MAC configuration information.
  • Step 802 After receiving the handover request message, the core network sends a handover request message to the target MeNB.
  • the bearer context configuration process wherein, in order to ensure consistency with the bearer configuration on the SeNB, the target MeNB needs to save the bearer context configuration information on the SeNB in the request message, and successfully sends a handover request response to the core network, where the handover command and the data are carried.
  • Predecessor information Predecessor information
  • Step 804 After receiving the handover request response, the core network sends a handover response to the source MeNB, where the handover command and the data pre-transmission information are carried.
  • Step 805 After receiving the handover response, the source MeNB establishes a data pre-transmission tunnel with the target MeNB, and performs data pre-transmission, and the source MeNB sends a handover command to the UE, where the handover command instructs the UE to perform only the MeNB handover, and maintains the connection on the SeNB. Do not switch;
  • Step 806 After receiving the handover command, the UE obtains synchronization with the target MeNB, and sends a handover completion message to the target MeNB.
  • Step 807 The target MeNB confirms that the UE successfully accesses, and sends a handover complete message to the core network.
  • Step 808 The core network sends a context release message to the source MeNB, indicating that the source MeNB successfully switches, and the corresponding resource may be released.
  • Step 809 The target MeNB sends a handover indication message to the SeNB according to the identifier information of the SeNB, and carries the identifier information allocated by the target MeNB for the UE, and is used for the SeNB connected to the UE. Instructing the control plane management of the UE to be transferred to the target MeNB, and carrying the port information of the offload tunnel and the context configuration information of the bearer on the target MeNB;
  • Step 810 The SeNB updates the locally saved context configuration according to the indication, and establishes a offload tunnel with the target MeNB according to the port information of the offload tunnel, completes offloading of the target MeNB to the SeNB, and sends a successful response to the target MeNB to complete the association between the SeNB and the target MeNB.
  • the above procedure takes the S1 handover between the MeNBs as an example. If the X2 handover occurs in practice, the above principle still applies, except that the name and path of the sent message are different.
  • the handover indication message sent to the SeNB may also be sent by the source MeNB.
  • the application also provides a master control base station, including: a handover request unit, where:
  • a handover requesting unit configured to initiate a handover, and after receiving the corresponding response, send a handover command to the user equipment UE, instruct the UE to switch the master base station MeNB by using the handover command, and maintain the connection with the controlled base station SeNB.
  • the handover requesting unit initiates the handover, and includes: sending a handover request message or a handover request message, where the message carries the bearer information on the controlled base station SeNB connected by the UE and the context configuration information of the bearer on the SeNB.
  • another main control base station includes: a handover unit, where: a handover unit, configured to send a handover indication message to a controlled base station SeNB connected to the UE after the user equipment UE successfully accesses The SeNB indicating the UE connection establishes an association with the target master base station MeNB according to the handover indication message.
  • the handover indication message carries the UE identification information
  • the switching unit is further configured to: when the offload anchor point between the target MeNB and the SeNB connected to the UE is the target MeNB, the handover indication message carries the port information of the offload tunnel between the target MeNB and the SeNB connected to the UE.
  • the switching unit is further configured to: when the offload anchor point between the target MeNB and the SeNB connected to the UE is the target MeNB, and the protocol layer of the target MeNB is used as the shunt layer, The message also carries the context configuration information of the bearer on the target MeNB.
  • the master base station further includes a receiving unit and a context configuration processing unit, where:
  • a receiving unit configured to perform admission admission control according to bearer information on the SeNB connected to the UE, after receiving the bearer information on the SeNB connected to the UE, before the UE successfully accesses;
  • the context configuration processing unit is configured to save context configuration information of the bearer on the SeNB after receiving the context configuration information of the bearer on the SeNB.
  • the present application further provides a controlled base station, including: a receiving unit and an associated establishing unit, where:
  • a receiving unit configured to receive a handover indication message
  • the association establishing unit is configured to establish an association with the target master base station MeNB according to the handover indication message after the receiving unit receives the handover indication message.
  • the establishing, by the association establishing unit, the association with the target MeNB according to the handover indication message includes: confirming that the control plane management of the UE has been handed over to the target MeNB according to the UE identifier information carried in the handover indication message.
  • the association establishing unit establishing, by the association establishing unit, the association with the target MeNB according to the handover indication message, further comprising: establishing, according to the port information of the offloaded tunnel carried in the handover indication message, the target MeNB, if the offload anchor point between the target MeNB and the SeNB is the target MeNB In the case of the offloading tunnel, and the offloading anchor between the target MeNB and the SeNB is the target MeNB, and the protocol layer of the target MeNB is used as the trafficking layer, the context configuration information of the bearer on the target MeNB carried in the handover indication message is saved.
  • part of the user plane data is not interrupted, and signaling overhead is also saved on the air interface, and the backward compatibility of the protocol is also ensured to the greatest extent.

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Abstract

一种切换方法、主控基站及受控基站,该方法应用于用户设备UE与主控基站MeNB和受控基站SeNB均有连接的多连接场景中为UE切换MeNB,包括:源MeNB发起切换,并在接收到相应的响应后,向UE发送切换命令,通过切换命令指示UE切换MeNB,并保持与SeNB的连接;在UE成功接入目标MeNB后,源MeNB或目标MeNB向UE连接的SeNB发送切换指示消息,UE连接的SeNB根据切换指示消息建立与目标MeNB的关联。本发明实施例在切换的过程中可以保证一部分的用户面数据不会受到中断,同时在空口上也节省了信令开销,也从最大程度上保证了协议的后向兼容性。

Description

一种切换方法、 主控基站及受控基站
技术领域
本发明涉及长期演进***, 尤其涉及一种切换方法、 主控基站及受控基 站。
背景技术
随着无线通信技术和标准的不断演进,移动分组业务得到了巨大的发展, 单终端的数据吞吐能力不断在提升。以长期演进(LTE, Long Term Evolution ) ***为例, 在 20M带宽内可以支持下行最大速率 100Mbps的数据传输, 后 续的增强的 LTE ( LTE Advanced ) 网络中, 数据的传输速率将进一步提升, 甚至可以达到 lGbps。
相关 LTE的用户面数据协议栈如图 1所示, 从核心网经用户层面 GPRS 隧道协议( GTP-U, GPRS Tunnelling Protocol for the User Plane )收到的下行 数据, 经解包后通过分组数据汇聚协议 ( PDCP , Packet Data Convergence Protocol )子层、 无线链路控制 (RLC, Radio Link Control )协议子层、 媒体 接入控制 ( MAC, Medium Access Control )协议子层和物理层(PHY )处理 后发送给用户设备(UE, User Equipment ) ; 上行数据的发送与下行数据正 好相反。
目前网络与 UE之间的数据传输链路是一对一的专用链接, 因此这条链 路的信号质量和使用的资源大小决定了两者间的数据传输性能。 如果链路使 用的资源受到限制或者信号质量比较差, 则 UE的用户体验就会下降, 这就 是现在移动运营商正在面临的巨大挑战, 虽然网络容量逐年扩增, 但仍赶不 上用户终端数量的增加和用户对数据业务量的需求。
为了满足数据业务量的增长需求, 以及业务在地域上不平均的特点, 运 营商在部署新一代通信网络(比如 LTE ) 的过程中, 也在增加低功率节点 ( LPN, Low Power Node )或称小小区 ( Small Cell )或微基站( Pico eNB ) 来进行热点增强。 随着 LPN小区的增加, 网络部署环境变得更加复杂, 同时 也带来了一些问题。 首先, 因为 LPN小区的覆盖范围相比于宏小区(Macro Cell )要小得多, 容量也相对较小, 某些 LPN小区可能会轻易被用户占满而导致负荷过高,从 而影响用户数据的吞吐量,而另外一些 LPN小区或宏小区会处在相对较低的 负荷水平上, 如果要平衡负荷, 需要网络侧执行负荷均衡操作, 但该过程不 够灵活, 尤其当小区较多时, 这种灵活性的缺乏导致的负荷不均就更严重。
另外, 由于 LPN小区数量比较多, 因此用户设备或称终端在网络内发生 移动时, 会导致频繁的小区间切换(Handover ) , 从而导致频繁的数据业务 中断甚至是掉话等问题, 这也会导致用户的数据吞吐量和用户体验的下降。 同时这种频繁的切换也会导致终端与网络, 尤其是核心网会收到大量的信令 冲击, 从而可能导致***资源拥塞甚至瘫痪。
随着将来运营商以及个人部署的 LPN小区数量的增加,上述情况会愈来 愈严重, 因此目前不少公司和运营商都倾向于寻求一种新的增强方案, 双连 接( Dual Connectivity )就是其中之一, 双连接下终端可以同时与两个(或两 个以上, 本文所述双连接只是一个泛称, 并不限制连接个数) 网络节点保持 连接, 如图 2所示, 其中主节点称为 MeNB ( Master eNB, —般指宏基站节 点)或主控基站, 而其他节点称为 SeNB ( Secondary eNB, 一般指微基站或 低功率节点)或受控基站, 比如 UE同时与宏小区和 LPN小区保持连接, 在 网络负荷不均衡时, 网络侧可以实时调控终端在 MeNB和 SeNB节点上的传 输数据量, 同时如果 UE移动或其他原因导致 SeNB小区变更时, 另外一个 小区还可以保持连接, 且这种变更不会导致过多的信令冲击。
在 MeNB和 SeNB之间的分流方式可以有很多种, 分流锚点可以放在服 务网关 (S-GW ) , 如图 3(A)所示; 也可以放在 MeNB, 如果放在 MeNB, 还可以根据其具体分流层次不同, 继续细化为不同层次之间的分流协作, 比 如在 PDCP层之上的分流, PDCP层之间的分流等等,如图 3(B)、 3(C), 3(D), 3(E)。
上述的双连接方式针对 SeNB频繁发生变更时进行了增强, 但在 MeNB 发生变更时, 涉及到 UE的所有上下文的迁移, 其中也包括 SeNB上承载的 部分配置信息等, 按照现有的切换方法无法进行双连接的切换。 MeNB只能 先收回 SeNB上的连接承载, 转换为单连接, 然后在 MeNB切换完成之后由 新的 MeNB重新选择 SeNB进行分流。 这就会增加数据业务中断以及掉话等 问题发生的概率, 因此, 仍然需要进一步优化。 发明内容
本发明要解决的技术问题是提供一种切换方法、 主控基站及受控基站, 能够在 UE的多连接场景中在避免数据业务中断以及掉话的情况下实现 UE 的主控基站的切换。
为解决上述技术问题, 本发明的一种切换方法, 应用于用户设备 UE与 主控基站 MeNB 和受控基站 SeNB 均有连接的多连接场景中为 UE 切换 MeNB, 包括:
源 MeNB发起切换, 并在接收到相应的响应后, 向所述 UE发送切换命 令, 通过所述切换命令指示所述 UE切换 MeNB, 并保持与 SeNB的连接; 在 UE成功接入目标 MeNB后 ,所述源 MeNB或目标 MeNB向 UE连接 的 SeNB发送切换指示消息, 所述 UE连接的 SeNB根据所述切换指示消息 建立与目标 MeNB的关联。
优选地, 所述方法还包括:
所述源 MeNB发起切换, 包括: 所述源 MeNB发送切换请求消息或切换 要求消息, 在消息中携带所述 UE连接的 SeNB上的承载信息和 SeNB上的 承载的上下文配置信息;
所述目标 MeNB在接收到所述 UE连接的 SeNB上的承载信息和 SeNB 上的承载的上下文配置信息后, 根据所述 UE连接的 SeNB上的承载信息进 行接纳准入控制, 并保存所述 SeNB上的承载的上下文配置信息。
优选地, 所述方法还包括:
所述源 MeNB在发送的切换请求消息或切换要求消息中还携带 UE连接 的 SeNB的标识信息;
在由所述目标 MeNB向 UE连接的 SeNB发送切换指示消息时, 所述目 标 MeNB根据所述 UE连接的 SeNB的标识信息向 UE连接的 SeNB发送所 述切换指示消息。 优选地,所述 UE连接的 SeNB根据所述切换指示消息建立与目标 MeNB 的关联, 包括:
所述 UE连接的 SeNB根据所述切换指示消息中携带的 UE标识信息, 确认所述 UE的控制面管理已经切换到所述目标 MeNB。
优选地, 在所述目标 MeNB与 UE连接的 SeNB之间的分流锚点为目标
MeNB的情况下 , 所述方法还包括:
所述源 MeNB或目标 MeNB向 UE连接的 SeNB发送切换指示消息包括: 在所述切换指示消息中携带目标 MeNB与所述 UE连接的 SeNB之间的分流 隧道的端口信息;
所述 UE连接的 SeNB根据所述切换指示消息建立与目标 MeNB的关联 还包括: 所述 UE 连接的 SeNB 根据所述分流隧道的端口信息与所述目标 MeNB建立分流隧道。
优选地, 在所述目标 MeNB与 UE连接的 SeNB之间的分流锚点为目标 MeNB, 并且由目标 MeNB的协议层作为分流层的情况下,所述方法还包括: 所述源 MeNB或目标 MeNB向 UE连接的 SeNB发送切换指示消息包括: 在所述切换指示消息中携带目标 MeNB上的承载的上下文配置信息。
一种主控基站, 包括: 切换请求单元, 其中:
所述切换请求单元, 设置为: 发起切换, 并在接收到相应的响应后, 向 用户设备 UE发送切换命令, 通过所述切换命令指示所述 UE切换主控基站 MeNB, 并保持与受控基站 SeNB的连接。
优选地, 所述切换请求单元设置为: 发起切换, 包括: 发送切换请求消 息或切换要求消息, 在消息中携带 UE连接的受控基站 SeNB上的承载信息 和 SeNB上的承载的上下文配置信息。
一种主控基站, 包括: 切换单元, 其中:
所述切换单元, 设置为: 在用户设备 UE成功接入后, 向 UE连接的受 控基站 SeNB发送切换指示消息, 指示所述 UE连接的 SeNB根据所述切换 指示消息建立与目标主控基站 MeNB的关联。
优选地, 所述切换指示消息中携带有 UE标识信息; 所述切换单元, 还设置为: 在所述目标 MeNB与 UE连接的 SeNB之间 的分流锚点为目标 MeNB的情况下, 在所述切换指示消息中携带目标 MeNB 与所述 UE连接的 SeNB之间的分流隧道的端口信息。
优选地,所述切换单元,还设置为:在所述目标 MeNB与 UE连接的 SeNB 之间的分流锚点为目标 MeNB, 并且由目标 MeNB的协议层作为分流层的情 况下,在所述切换指示消息中还携带目标 MeNB上的承载的上下文配置信息。
优选地, 所述主控基站还包括接纳单元和上下文配置处理单元, 其中: 所述接纳单元, 设置为: 在 UE成功接入前, 在接收到所述 UE连接的 SeNB上的承载信息后,根据所述 UE连接的 SeNB上的承载信息进行接纳准 入控制;
所述上下文配置处理单元, 设置为: 在接收到 SeNB上的承载的上下文 配置信息后, 保存所述 SeNB上的承载的上下文配置信息。
一种受控基站, 包括: 接收单元和关联建立单元, 其中:
所述接收单元, 设置为: 接收切换指示消息;
所述关联建立单元, 设置为: 在所述接收单元接收到所述切换指示消息 后, 根据所述切换指示消息建立与目标主控基站 MeNB的关联。
优选地, 所述关联建立单元设置为: 根据所述切换指示消息建立与目标 MeNB的关联包括: 根据所述切换指示消息中携带 UE标识信息, 确认所述 UE的控制面管理已经切换到所述目标 MeNB。
优选地, 所述关联建立单元设置为: 根据所述切换指示消息建立与目标
MeNB 的关联还包括: 在所述目标 MeNB与 SeNB之间的分流锚点为目标 MeNB的情况下, 根据所述切换指示消息中携带的分流隧道的端口信息与所 述目标 MeNB建立分流隧道,以及在所述目标 MeNB与 SeNB之间的分流锚 点为目标 MeNB, 并且由目标 MeNB的协议层作为分流层的情况下, 保存所 述切换指示消息中携带的目标 MeNB上的承载的上下文配置信息。 时的切换性能。在切换的过程中可以保证一部分的用户面数据不会受到中断, 同时在空口上也节省了信令开销,也从最大程度上保证了协议的后向兼容性。 附图概述
图 1是相关技术中 LTE用户面协议栈的示意图;
图 2是相关技术中数据多流传输架构的示意图;
图 3(A)〜图 3(E)是相关技术中数据分流协议栈的示意图;
图 4是本申请实施方式的具体实施场景的示意图;
图 5是本申请实施方式的实施例一的流程图;
图 6是本申请实施方式的实施例二的流程图;
图 7是本申请实施方式的实施例三的流程图;
图 8是本申请实施方式的实施例四的流程图;
图 9是本申请实施方式的一种主控基站的架构图;
图 10是本申请实施方式的受控基站的架构图。 本发明的较佳实施方式
如图 4所示, 当 SeNB处于两个 MeNB的覆盖交叠区域时, 如果 UE正 连接到 MeNBl和 SeNB,此时因为 UE移动,需要从 MeNBl切换到 MeNB2, 随之控制面信令和 UE的所有上下文信息都会转移到 MeNB2上。 本申请中 考虑到在 UE需要从 MeNBl切换到 MeNB2时, 因为 UE并没有移出 SeNB 的覆盖范围, 因此切换时可以保持 SeNB侧的连接, 则 UE在 SeNB上的连 接就不会受到影响。 为了保证后续 SeNB能与 MeNB2进行正常的分流交互, 在切换完成之后, MeNBl或 MeNB2需要发送切换指示消息给 SeNB。 即: 当执行双连接的 UE在 MeNB发生切换时,在源 MeNB和目标 MeNB的覆盖 重叠区域的 SeNB上的连接可以保持不动, 在切换完成后 SeNB重新与目标 MeNB建立关联。
本申请中, 源 MeNB发起切换, 并在接收到相应的响应后, 向 UE发送 切换命令, 通过切换命令指示 UE切换 MeNB, 并保持与 SeNB的连接; 在 UE成功接入目标 MeNB后, 源 MeNB或目标 MeNB向 UE连接的 SeNB发 送切换指示消息, 向 UE连接的 SeNB指示 UE 已从源 MeNB切换到目标 MeNB, UE连接的 SeNB根据切换指示消息建立与目标 MeNB的关联。
本申请中, 针对 X2切换, 源 MeNB向目标 MeNB发送切换请求消息, 其中携带 UE连接的 SeNB上的承载信息、 SeNB的标识信息和 SeNB上的承 载的上下文配置信息,在源 MeNB上有承载时,还携带源 MeNB上的承载信 息; 目标 MeNB向源 MeNB发送切换命令和可选的数据前传信息, 并由源 MeNB向 UE发送切换命令,其中指示 UE只进行 MeNB的切换;在目标 MeNB 确认 UE成功切换到目标 MeNB后, 向核心网发送路径切换消息完成用户面 的路径切换, 同时向 SeNB发送切换指示消息, 最后 SeNB向目标 MeNB发 送响应消息, 建立 SeNB与目标 MeNB的关联。
目标 MeNB向 UE连接的 SeNB发送切换指示消息, 其中切换指示消息 中携带目标 MeNB为 UE分配的 UE标识信息, 指示 SeNB该 UE的控制面 管理已经转移到目标 MeNB;
在目标 MeNB与 UE连接的 SeNB之间的分流锚点为目标 MeNB, 并且 由目标 MeNB的协议层作为分流层的情况下,切换指示消息中还可以携带目 标 MeNB上的? 载的上下文配置信息; 目标 MeNB将 MeNB上的 7 载的上 下文配置信息发送给 SeNB, 可以使 SeNB获得在 MeNB上的分流层的配置 信息以及分流层上层的配置信息, SeNB在需要发送上行数据时,根据 MeNB 上的分流层的配置信息及分流层上层的配置信息正确的进行数据包的发送, 避免了由于 UE在切换到目标 MeNB上后, 目标 MeNB上的承载相对于源 MeNB发生改变, 而 SeNB无法获得目标 MeNB上的分流层的配置信息和分 流层上层的配置信息, 导致的分流层和分流层上层无法处理 SeNB发送的数 据包, 以致 SeNB的数据包无法正常发送。
在目标 MeNB与 UE连接的 SeNB之间的分流锚点为目标 MeNB的情况 下, 切换指示消息中还可以携带目标 MeNB与 SeNB之间的分流隧道的端口 信息, 用以建立 SeNB和目标 MeNB之间的分流隧道。
SeNB建立与目标 MeNB的关联,是指 SeNB根据切换指示消息中的 UE 标识信息确认 UE的控制面管理已经转移到目标 MeNB, 由目标 MeNB管理 SeNB继续分流传输。 同时如果分目标 MeNB与 UE连接的 SeNB之间的分 流锚点为目标 MeNB, 即 SeNB是从目标 MeNB #文分流, 该关联还包括 UE 连接的 SeNB根据分流隧道的端口信息与目标 MeNB建立分流隧道。
下面结合不同的实施例对本申请进行进一步的说明。
实施例一:
以服务网关( S-GW )做分流锚点为例, UE在 MeNB和 SeNB上的承载 用户面直接连接到 S-GW,如图 3(A)。源 MeNB要发起向目标 MeNB的切换, 如图 5所示, 包括:
步骤 501 : 源 MeNB向目标 MeNB发送切换请求消息, 其中携带 UE连 接的 SeNB上的承载信息、 SeNB的标识信息和 SeNB上的承载的上下文配置 信息, 在源 MeNB上有承载时还携带源 MeNB上的承载信息;
承载信息包含承载的标识信息、 承载的服务质量(QoS )参数、 承载的 数据前传信息和上行 Λ良务网关的端口地址信息中的一种或多种。
针对图 3(A), SeNB上的承载的上下文配置信息包括承载对应的无线资 源控制 (RRC )配置信息、 层 2 (包括 PDCP、 RLC和 MAC )配置信息、 物 理层配置信息、 安全能力信息和安全密钥信息。
步骤 502: 目标 MeNB收到切换请求消息后, 根据承载信息进行接纳准 入控制, 根据 SeNB上的承载的上下文配置信息进行承载上下文配置处理, 其中, 为了保证与 SeNB上的承载配置保持一致, 目标 MeNB需要保存请求 消息中的 SeNB上的承载上下文配置信息,成功后向源 MeNB发送切换响应, 其中携带切换命令和数据前传信息;
数据前传信息是指为执行源 MeNB和目标 MeNB之间的数据前传( data forwarding ) 而建立的前传隧道端口信息。
步骤 503:源 MeNB收到切换响应后,与目标 MeNB建立数据前传隧道, 并进行数据前传, 同时源 MeNB向 UE发送切换命令, 其中通过切换命令指 示 UE只进行 MeNB的切换, 保持 SeNB上的连接不做切换;
步骤 504: UE收到切换命令后与目标 MeNB获得同步, 并发送切换完 成消息给目标 MeNB; 步骤 505: 目标 MeNB确认 UE成功接入后, 向核心网发送路径切换消 息 ( ath switch ) , 指示核心网将 SI口承载切换到目标 MeNB;
步骤 506: 同时目标 MeNB根据 SeNB的标识信息向 SeNB发送切换指 示消息, 携带目标 MeNB为该 UE分配的 UE标识信息, 用于指示 SeNB所 述 UE的控制面管理已经转移到目标 MeNB;
步骤 507 : SeNB根据指示更新本地存储的 UE上下文, 并向目标 MeNB 发送成功响应, 完成 SeNB与目标 MeNB的关联。
步骤 508: 目标 MeNB向源 MeNB发送上下文释放消息 , 指示源 MeNB 切换成功, 可以释放相应资源。
上述过程以 MeNB之间的 X2切换为例, 实际中如果发生的是 S1切换, 上述原理仍适用, 只是所发消息名称和路径有所不同。
上述步骤 505、 506和 507、 508的先后顺序可以随意调整, 具体以实现 而定。
上述向 SeNB发送的切换指示消息, 也可以由源 MeNB发送。
实施例二:
以 MeNB做分流锚点为例, 其中数据在 PDCP层之上发生分流, 分别发 送给 MeNB和 SeNB进行传递,如图 3(B)所示。源 MeNB要发起向目标 MeNB 的切换, 如图 6所示, 包括:
步骤 601 : 源 MeNB向目标 MeNB发送切换请求消息, 其中携带 UE连 接的 SeNB上的承载信息、 SeNB的标识信息和 SeNB上的承载的上下文配置 信息;
步骤 602 : 目标 MeNB收到切换请求消息后, 进行接纳准入控制和承载 上下文配置处理, 其中, 为了保证与 SeNB 上的承载配置保持一致, 目标 MeNB需要保存请求消息中的 SeNB上的承载上下文配置信息, 成功后向源 MeNB 发送切换响应, 其中携带切换命令、 数据前传信息和目标 MeNB 为 UE分配的分流隧道信息和 UE标识信息;
针对图 3(B) , SeNB上的承载的上下文配置信息包括承载对应的无线资 源控制 (RRC )配置信息、 层 2 (包括 PDCP、 RLC和 MAC )配置信息、 物 理层配置信息、 安全能力信息和安全密钥信息。
步骤 603 :源 MeNB收到切换响应后,与目标 MeNB建立数据前传隧道, 并进行数据前传, 同时源 MeNB向 UE发送切换命令, 其中通过切换命令指 示 UE只进行 MeNB的切换, 保持 SeNB上的连接不做切换;
步骤 604 : UE收到切换命令后与目标 MeNB获得同步, 并发送切换完 成消息给目标 MeNB ;
步骤 605: 同时源 MeNB向 SeNB发送切换指示消息, 携带目标 MeNB 为该 UE分配的 UE标识信息,用于指示 SeNB所述 UE的控制面管理已经转 移到目标 MeNB; 并携带分流隧道的端口信息;
步骤 606: SeNB收到切换指示消息后, 确认 UE的控制面管理已经转移 到目标 MeNB , 并根据分流隧道的端口信息与目标 MeNB建立分流隧道, 完 成目标 MeNB向 SeNB的分流, SeNB成功建立分流隧道之后, SeNB向目标 MeNB发送成功响应, 完成与目标 MeNB之间的关联;
步骤 607: 同时目标 MeNB向核心网发送路径切换消息 ( path switch ) , 指示核心网将 SI口承载切换到目标 MeNB;
步骤 608: 目标 MeNB向源 MeNB发送上下文释放消息 , 指示源 MeNB 切换成功, 可以释放相应资源。
上述过程以 MeNB之间的 X2切换为例, 实际中如果发生的是 S1切换, 上述原理仍适用, 只是所发消息名称和路径有所不同。
上述步骤 605和 606、 607、 608的先后顺序可以随意调整, 具体以实现 而定。
上述向 SeNB发送的切换指示消息, 也可以由目标 MeNB发送。
实施例三:
以 MeNB做分流锚点为例, 其中数据在 PDCP层与 RLC层之间发生分 流, 分别发送给 MeNB和 SeNB进行传递, 如图 3(D)所示。 源 MeNB要发起 向目标 MeNB的切换, 如图 7所示, 包括: 步骤 701 : 源 MeNB向目标 MeNB发送切换请求消息, 其中携带 UE连 接的 SeNB上的承载信息、 SeNB的标识信息和 SeNB上的承载的上下文配置 信息,在源 MeNB上有承载时还携带源 MeNB上的承载信息,还可以携带下 行数据前传指示等;
针对图 3(D), SeNB上的承载的上下文配置信息包括承载对应的 RRC配 置信息和层 2 (包括 PDCP、 RLC和 MAC ) 配置信息。
步骤 702: 目标 MeNB收到切换请求消息后, 进行接纳准入控制和承载 上下文配置处理, 其中, 为了保证与 SeNB 上的承载配置保持一致, 目标 MeNB需要保存请求消息中的 SeNB上的承载上下文配置信息, 成功后向源 MeNB发送切换响应, 其中携带切换命令和数据前传信息;
步骤 703:源 MeNB收到切换响应后,与目标 MeNB建立数据前传隧道, 并进行数据前传, 同时源 MeNB向 UE发送切换命令, 其中通过切换命令指 示 UE只进行 MeNB的切换, 保持 SeNB上的连接不做切换;
步骤 704: UE收到切换后与目标 MeNB获得同步, 并发送切换完成消 息给目标 MeNB;
步骤 705: 目标 MeNB确认 UE成功接入后, 向源 MeNB发送上下文释 放消息, 指示源 MeNB切换成功, 可以释放相应资源;
步骤 706: 同时目标 MeNB根据 SeNB的标识信息向 SeNB发送切换指 示消息, 携带目标 MeNB为该 UE分配的 UE标识信息, 用于向 UE连接的 SeNB指示 UE的控制面管理已经转移到目标 MeNB,并携带分流隧道的端口 信息和目标 MeNB上的承载的上下文配置信息;
目标 MeNB上的 7 载的上下文配置信息,比如是目标 MeNB为 UE新分 配的标识等。目标 MeNB将 MeNB上的承载的上下文配置信息发送给 SeNB, 可以使 SeNB获得在 MeNB上的分流层的配置信息以及分流层上层的配置信 息, SeNB在需要发送上行数据时, 根据 MeNB上的分流层的配置信息及分 流层上层的配置信息正确的进行数据包的发送, 避免了由于 UE在切换到目 标 MeNB上后, 目标 MeNB上的? 载相对于源 MeNB发生改变, 而 SeNB 无法获得目标 MeNB上的分流层的配置信息和分流层上层的配置信息,导致 的分流层和分流层上层无法处理 SeNB发送的数据包, 以致 SeNB的数据包 无法正常发送。
如图 3(C >所示, MeNB上的分流层为 MeNB的 PDCP层, 目标 MeNB 将 MeNB 上的承载的上下文配置信息发送给 SeNB , 可以使 SeNB 获得在 MeNB上的 PDCP层的配置信息,由于 SeNB的上行数据需要 MeNB的 PDCP 层处理, 因此, 为使 SeNB正常发送上行数据, 需要使 SeNB获知 MeNB上 的 PDCP层的配置信息。
如图 3(D)所示, MeNB上的分流层为 MeNB的 PDCP层, 目标 MeNB 将 MeNB 上的承载的上下文配置信息发送给 SeNB , 可以使 SeNB 获得在 MeNB上的 PDCP层的配置信息。
如图 3(E)所示, MeNB上的分流层为 MeNB的 RLC层, 分流层上层为
PDCP层, 目标 MeNB将 MeNB上的承载的上下文配置信息发送给 SeNB , 可以使 SeNB获得在 MeNB上的 PDCP层的配置信息和 RLC层的配置信息。
步骤 707: SeNB收到切换指示消息后, 根据切换指示消息中携带的 UE 标识信息, 确认 UE的控制面管理已经切换到目标 MeNB , 根据分流隧道的 端口信息与目标 MeNB建立分流隧道, 完成目标 MeNB向 SeNB的分流,根 据目标 MeNB 上的承载的上下文配置信息更新本地保存的相应的上下文配 置, 完成 SeNB与目标 MeNB的关联, 并向目标 MeNB发送成功响应, 完成 SeNB与目标 MeNB的关联。
步骤 708: 目标 MeNB向核心网发送路径切换消息 (path switch ) , 指 示核心网将 S1口承载切换到目标 MeNB。
上述过程以 MeNB之间的 X2切换为例, 实际中如果发生的是 S1切换, 上述原理仍适用, 只是所发消息名称和路径有所不同。
上述步骤 705、 706和 707、 708的先后顺序可以随意调整, 具体以实现 而定。
上述向 SeNB发送的切换指示消息, 也可以由源 MeNB发送。
实施例四:
以 MeNB做分流锚点为例,其中数据在 RLC层之内分流, MeNB和 SeNB 的 RLC实体分别称为主 RLC和从 RLC,数据通过主 RLC发送给 SeNB进行 传递, 如图 3(E)所示。 源 MeNB要发起向目标 MeNB的切换, 如图 8所示, 包括:
步骤 801: 源 MeNB向核心网发起切换要求消息, 其中携带 UE连接的 SeNB上的承载信息、 SeNB的标识信息和 SeNB上的承载的上下文配置信息, 在源 MeNB上有承载时还携带源 MeNB上的承载信息;
SeNB上的承载的上下文配置信息包括承载在 SeNB侧的协议曾的配置, 如图 3(E), SeNB上的承载的上下文配置信息包括 RRC配置信息、 RLC配置 信息和 MAC配置信息。
步骤 802:核心网收到切换要求消息后向目标 MeNB发送切换请求消息; 步骤 803: 目标 MeNB收到切换请求消息后, 根据承载信息进行接纳准 入控制, 根据 SeNB上的承载的上下文配置信息进行承载上下文配置处理, 其中, 为了保证与 SeNB上的承载配置保持一致, 目标 MeNB需要保存请求 消息中的 SeNB上的承载上下文配置信息, 成功后向核心网发送切换请求响 应, 其中携带切换命令和数据前传信息;
步骤 804: 核心网收到切换请求响应后, 向源 MeNB发送切换响应, 其 中携带切换命令和数据前传信息;
步骤 805:源 MeNB收到切换响应后,与目标 MeNB建立数据前传隧道, 并进行数据前传, 同时源 MeNB向 UE发送切换命令, 其中通过切换命令指 示 UE只进行 MeNB的切换, 保持 SeNB上的连接不做切换;
步骤 806: UE收到切换命令后与目标 MeNB获得同步, 并发送切换完 成消息给目标 MeNB;
步骤 807: 目标 MeNB确认 UE成功接入后, 向核心网发送切换完成消 息;
步骤 808: 核心网向源 MeNB发送上下文释放消息, 指示源 MeNB切换 成功, 可以释放相应资源;
步骤 809: 同时目标 MeNB根据 SeNB的标识信息向 SeNB发送切换指 示消息, 携带目标 MeNB为 UE分配的标识信息, 用于向 UE连接的 SeNB 指示 UE的控制面管理已经转移到目标 MeNB, 并携带分流隧道的端口信息 和目标 MeNB上的承载的上下文配置信息;
步骤 810: SeNB根据指示更新本地保存的上下文配置, 并根据分流隧 道的端口信息与目标 MeNB建立分流隧道,完成目标 MeNB向 SeNB的分流, 并向目标 MeNB发送成功响应, 完成 SeNB与目标 MeNB的关联。
上述过程以 MeNB之间的 S1切换为例, 实际中如果发生的是 X2切换, 上述原理仍适用, 只是所发消息名称和路径有所不同。
上述向 SeNB发送的切换指示消息, 也可以由源 MeNB发送。
本申请还提供了一种主控基站, 包括: 切换请求单元, 其中:
切换请求单元, 用于发起切换, 并在接收到相应的响应后, 向用户设备 UE发送切换命令, 通过切换命令指示 UE切换主控基站 MeNB, 并保持与受 控基站 SeNB的连接。
切换请求单元发起切换, 包括: 发送切换请求消息或切换要求消息, 在 消息中携带 UE连接的受控基站 SeNB上的承载信息和 SeNB上的承载的上 下文配置信息。
如图 9所示, 本申请提供的另一种主控基站, 包括: 切换单元, 其中: 切换单元,用于在用户设备 UE成功接入后,向 UE连接的受控基站 SeNB 发送切换指示消息, 指示 UE连接的 SeNB根据切换指示消息建立与目标主 控基站 MeNB的关联。
切换指示消息中携带有 UE标识信息;
切换单元, 还用于在目标 MeNB与 UE连接的 SeNB之间的分流锚点为 目标 MeNB的情况下,在切换指示消息中携带目标 MeNB与 UE连接的 SeNB 之间的分流隧道的端口信息。
切换单元, 还用于在目标 MeNB与 UE连接的 SeNB之间的分流锚点为 目标 MeNB, 并且由目标 MeNB的协议层作为分流层的情况下, 在切换指示 消息中还携带目标 MeNB上的承载的上下文配置信息。
主控基站还包括接纳单元和上下文配置处理单元, 其中:
接纳单元, 用于在 UE成功接入前, 在接收到 UE连接的 SeNB上的承 载信息后, 根据 UE连接的 SeNB上的承载信息进行接纳准入控制;
上下文配置处理单元, 用于在接收到 SeNB上的承载的上下文配置信息 后, 保存 SeNB上的承载的上下文配置信息。
如图 10所示, 本申请还提供了一种受控基站, 包括: 接收单元和关联建 立单元, 其中:
接收单元, 用于接收切换指示消息;
关联建立单元, 用于在接收单元接收到切换指示消息后, 根据切换指示 消息建立与目标主控基站 MeNB的关联。
关联建立单元根据切换指示消息建立与目标 MeNB的关联包括:根据切 换指示消息中携带 UE 标识信息, 确认 UE 的控制面管理已经切换到目标 MeNB。
关联建立单元根据切换指示消息建立与目标 MeNB的关联还包括: 在目 标 MeNB与 SeNB之间的分流锚点为目标 MeNB的情况下,根据切换指示消 息中携带的分流隧道的端口信息与目标 MeNB 建立分流隧道, 以及在目标 MeNB与 SeNB之间的分流锚点为目标 MeNB, 并且由目标 MeNB的协议层 作为分流层的情况下,保存切换指示消息中携带的目标 MeNB上的承载的上 下文配置信息。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成, 所述程序可以存储于计算机可读存储介质中, 如只读 存储器、 磁盘或光盘等。 可选地, 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地, 上述实施例中的各模块 /单元可以釆用 硬件的形式实现, 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。 当然, 本发明还可有其他多种实施例, 在不背离本发明精神及其实质的 但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。
工业实用 4生
能。 在切换的过程中可以保证一部分的用户面数据不会受到中断, 同时在空 口上也节省了信令开销, 也从最大程度上保证了协议的后向兼容性。

Claims

权 利 要 求 书
1、 一种切换方法, 其特征在于, 应用于用户设备 UE与主控基站 MeNB 和受控基站 SeNB均有连接的多连接场景中为 UE切换 MeNB , 包括:
源 MeNB发起切换, 并在接收到相应的响应后, 向所述 UE发送切换命 令, 通过所述切换命令指示所述 UE切换 MeNB, 并保持与 SeNB的连接; 在 UE成功接入目标 MeNB后 ,所述源 MeNB或目标 MeNB向 UE连接 的 SeNB发送切换指示消息, 所述 UE连接的 SeNB根据所述切换指示消息 建立与目标 MeNB的关联。
2、 如权利要求 1所述的方法, 其中, 所述方法还包括:
所述源 MeNB发起切换, 包括: 所述源 MeNB发送切换请求消息或切换 要求消息, 在消息中携带所述 UE连接的 SeNB上的承载信息和 SeNB上的 承载的上下文配置信息;
所述目标 MeNB在接收到所述 UE连接的 SeNB上的承载信息和 SeNB 上的承载的上下文配置信息后, 根据所述 UE连接的 SeNB上的承载信息进 行接纳准入控制, 并保存所述 SeNB上的承载的上下文配置信息。
3、 如权利要求 2所述的方法, 其中, 所述方法还包括:
所述源 MeNB在发送的切换请求消息或切换要求消息中还携带 UE连接 的 SeNB的标识信息;
在由所述目标 MeNB向 UE连接的 SeNB发送切换指示消息时, 所述目 标 MeNB根据所述 UE连接的 SeNB的标识信息向 UE连接的 SeNB发送所 述切换指示消息。
4、 如权利要求 1所述的方法, 其中, 所述 UE连接的 SeNB根据所述切 换指示消息建立与目标 MeNB的关联, 包括:
所述 UE连接的 SeNB根据所述切换指示消息中携带的 UE标识信息, 确认所述 UE的控制面管理已经切换到所述目标 MeNB。
5、 如权利要求 4所述的方法, 其中, 在所述目标 MeNB与 UE连接的 SeNB之间的分流锚点为目标 MeNB的情况下, 所述方法还包括: 所述源 MeNB或目标 MeNB向 UE连接的 SeNB发送切换指示消息包括: 在所述切换指示消息中携带目标 MeNB与所述 UE连接的 SeNB之间的分流 隧道的端口信息;
所述 UE连接的 SeNB根据所述切换指示消息建立与目标 MeNB的关联 还包括: 所述 UE 连接的 SeNB 根据所述分流隧道的端口信息与所述目标 MeNB建立分流隧道。
6、 如权利要求 1所述的方法, 其中, 在所述目标 MeNB与 UE连接的 SeNB之间的分流锚点为目标 MeNB, 并且由目标 MeNB的协议层作为分流 层的情况下, 所述方法还包括:
所述源 MeNB或目标 MeNB向 UE连接的 SeNB发送切换指示消息包括: 在所述切换指示消息中携带目标 MeNB上的承载的上下文配置信息。
7、 一种主控基站, 包括: 切换请求单元, 所述切换请求单元, 设置为: 发起切换, 并在接收到相应的响应后, 向用户设备 UE发送切换命令, 通过 所述切换命令指示所述 UE切换主控基站 MeNB, 并保持与受控基站 SeNB 的连接。
8、 如权利要求 7 所述的主控基站, 其中, 所述切换请求单元设置为: 发起切换, 包括: 发送切换请求消息或切换要求消息, 在消息中携带 UE连 接的受控基站 SeNB上的承载信息和 SeNB上的承载的上下文配置信息。
9、 一种主控基站, 包括: 切换单元, 所述切换单元, 设置为: 在用户 设备 UE成功接入后, 向 UE连接的受控基站 SeNB发送切换指示消息, 指 示所述 UE连接的 SeNB根据所述切换指示消息建立与目标主控基站 MeNB 的关联。
10、 如权利要求 9所述的主控基站, 其中,
所述切换指示消息中携带有 UE标识信息;
所述切换单元, 还设置为: 在所述目标 MeNB与 UE连接的 SeNB之间 的分流锚点为目标 MeNB的情况下, 在所述切换指示消息中携带目标 MeNB 与所述 UE连接的 SeNB之间的分流隧道的端口信息。
11、 如权利要求 10所述的主控基站, 其中,
所述切换单元, 还设置为: 在所述目标 MeNB与 UE连接的 SeNB之间 的分流锚点为目标 MeNB,并且由目标 MeNB的协议层作为分流层的情况下, 在所述切换指示消息中还携带目标 MeNB上的承载的上下文配置信息。
12、 如权利要求 9所述的主控基站, 其中, 所述主控基站还包括接纳单 元和上下文配置处理单元, 其中: 所述接纳单元, 设置为: 在 UE成功接入 前, 在接收到所述 UE连接的 SeNB上的承载信息后, 根据所述 UE连接的 SeNB上的承载信息进行接纳准入控制;
所述上下文配置处理单元, 设置为: 在接收到 SeNB上的承载的上下文 配置信息后, 保存所述 SeNB上的承载的上下文配置信息。
13、 一种受控基站, 包括: 接收单元和关联建立单元, 其中:
所述接收单元, 设置为: 接收切换指示消息;
所述关联建立单元, 设置为: 在所述接收单元接收到所述切换指示消息 后, 根据所述切换指示消息建立与目标主控基站 MeNB的关联。
14、 如权利要求 13所述的受控基站, 其中, 所述关联建立单元设置为: 根据所述切换指示消息建立与目标 MeNB的关联包括:根据所述切换指示消 息中携带 UE 标识信息, 确认所述 UE 的控制面管理已经切换到所述目标 MeNB。
15、 如权利要求 14所述的受控基站, 其中, 所述关联建立单元设置为: 根据所述切换指示消息建立与目标 MeNB的关联还包括: 在所述目标 MeNB 与 SeNB之间的分流锚点为目标 MeNB的情况下, 根据所述切换指示消息中 携带的分流隧道的端口信息与所述目标 MeNB建立分流隧道, 以及在所述目 标 MeNB与 SeNB之间的分流锚点为目标 MeNB ,并且由目标 MeNB的协议 层作为分流层的情况下,保存所述切换指示消息中携带的目标 MeNB上的承 载的上下文配置信息。
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