WO2011012050A1 - 切换控制方法、装置和系统 - Google Patents

切换控制方法、装置和系统 Download PDF

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Publication number
WO2011012050A1
WO2011012050A1 PCT/CN2010/075182 CN2010075182W WO2011012050A1 WO 2011012050 A1 WO2011012050 A1 WO 2011012050A1 CN 2010075182 W CN2010075182 W CN 2010075182W WO 2011012050 A1 WO2011012050 A1 WO 2011012050A1
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WO
WIPO (PCT)
Prior art keywords
access point
handover
target access
user equipment
target
Prior art date
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PCT/CN2010/075182
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English (en)
French (fr)
Inventor
朱伟
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 BR112012001994A priority Critical patent/BR112012001994A2/pt
Priority to EP10803883.7A priority patent/EP2461625B1/en
Publication of WO2011012050A1 publication Critical patent/WO2011012050A1/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
    • H04W36/0055Transmission 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
    • 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
    • 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
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/12Access point controller devices

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a handover control method, apparatus, and system. Background technique
  • a femtocell also known as a home base station or a 3G access point
  • a femtocell is a solution for extending indoor coverage of mobile communications, and can transmit voice and data calls from user equipment (UE) to A 3rd generation mobile communication technology (The 3rd Generation ⁇ G) core network based on a standard interface, and its home access point (AP) plug and play, can be connected to any existing IP-based transport network .
  • UE user equipment
  • AP home access point
  • 3G works in the 2GHz band, and its wireless propagation characteristics, especially the building penetration characteristics, are poor, resulting in a decline in indoor service quality.
  • the emergence of Femtocell can effectively improve indoor coverage and service quality.
  • the inventors of the present invention have found that, under the femto architecture defined by 3GPP R8, the handover of the user equipment AP to the AP is not currently supported. Because the coverage of the AP is small, the process of switching the user equipment from one AP to another is more frequent. If the handover process from the access point to the macro network is used to implement AP-to-AP handover, the handover control needs to be performed by the core network (Core Network). , CN) Node completion, will have a large load impact on the core network equipment. Summary of the invention
  • Embodiments of the present invention provide a handover control method, apparatus, and system, which can reduce a core network load.
  • the access gateway receives a handover request message sent by the source access point of the user equipment, where the handover request message includes a target access point identifier;
  • the access gateway controls the handover of the user equipment from the source access point to the target access point according to the pre-acquired handover control parameter.
  • a handover control apparatus provided by an embodiment of the present invention, where the apparatus is an access gateway, includes: a handover request receiving unit, configured to receive a handover request message sent by a source access point of the user equipment, where the handover request message includes a target connection Entry point identifier;
  • a handover control unit configured to control, according to the pre-acquired handover control parameter, the handover of the user equipment from the source access point to the target access point.
  • a handover control system includes: the foregoing handover control apparatus, and a source access point and a target access point in communication with the handover control apparatus.
  • the access gateway controls the switching of the user equipment from the source access point to the target access point according to the pre-acquired handover control parameter. Switching control through the access gateway can reduce the load on the core network device, make the system run more stable, and reduce the signaling interaction between the access gateway and the core network, thereby saving bandwidth.
  • FIG. 1 is a flowchart of a handover control method according to Embodiment 1 of the present invention.
  • FIG. 2 is a flowchart of obtaining an security mode parameter in an process in which a security gateway initiates a security mode in a core network according to an embodiment of the present invention
  • FIG. 3 is a flow chart of obtaining, by the access gateway, an RAB parameter in an RAB assignment process according to an embodiment of the present invention
  • FIG. 6 is a schematic flowchart of modifying a service bearer of a core network side in an embodiment of the present invention
  • FIG. 7 is a flowchart of releasing a service that is not supported by a target access point according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a switching control apparatus according to Embodiment 3 of the present invention.
  • FIG. 9 is a schematic structural diagram of a switching control apparatus according to Embodiment 4 of the present invention. detailed description
  • Embodiments of the present invention provide a handover control method, apparatus, and system, which are described in detail below.
  • WCDMA Wideband Code Division Multiple Access
  • GSM Global System For Mobile Communications
  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access
  • WIMAX Worldwide Interoperability for Microwave Access
  • LTE Long Term Evolution
  • Embodiment 1 A switching control method, which is shown in FIG. 1 and includes:
  • an access gateway receives a handover request message sent by a source access point of the user equipment, where the handover request message includes a target access point identifier;
  • the access gateway controls handover of the user equipment from the source access point to the target access point according to the pre-acquired handover control parameter.
  • the access gateway acquires the handover control parameter in advance, and controls the handover of the user equipment from the source access point to the target access point according to the handover control parameter, and implements handover control by using the access gateway, thereby reducing the core network.
  • the load of the device makes the system run more stable, and at the same time reduces the signaling interaction between the access gateway and the core network, saving bandwidth.
  • the solution of the embodiment of the present invention may further include: determining whether the target access point is within the management scope of the access gateway, and if not, transmitting the handover request message to the core network, and performing handover control by the core network.
  • the access gateway records the access points managed by the access gateway to implement data forwarding, and the specific recording mode is implemented by saving the access point identifier list or the routing table managed by the access gateway. Therefore, when the access gateway receives the handover control request of the user equipment carrying the target access point identifier, the access gateway may determine, according to the identifier of the target access point, whether the target access point is within the range managed by the access gateway.
  • the handover control parameter in the embodiment of the present invention may include: a security mode parameter of the user equipment and a RAB parameter of the user equipment. It can be understood that the handover control parameter may also include other parameters of the existing access gateway in the prior art or parameters that the access gateway can obtain through the prior art.
  • the embodiment of the present invention emphasizes that the acquired handover control parameter is in the prior art. Access gateway in the middle is not obtained And the parameters that need to be used during the switching control process.
  • Obtaining the security mode parameter of the user equipment may be obtained by the access gateway in the process of initiating the security mode of the core network, and the specific process is as shown in FIG. 2, including:
  • the core network (CN) node sends a security mode command message (Security Mode Command) to the AG to the Iu interface (the interface between the RNC/AG and the CN node), and the message includes the security mode parameter;
  • a security mode command message Security Mode Command
  • the core network node may be a Mobile Switching Center (MSC) or a Serving GPRS Support Node (SGSN) or a core network device with similar network control functions.
  • MSC Mobile Switching Center
  • SGSN Serving GPRS Support Node
  • the security mode parameters can be: "Integrity Protection Information” cells and "Encryption Information” cells, which are in the Radio Access Network Application Protocol (RANAP) protocol are shown in Table 1:
  • the B2 After receiving the security mode command message of the CN node, the B2 saves the security mode parameter in Table 1 above.
  • the AG sends a security mode command message (Security Mode Command) of the Iuh interface (the interface between the AP and the AG) to the AP, and the RANAP content in the message is from the Iu interface security mode command message in step B1.
  • a security mode command message Security Mode Command
  • the AP performs network configuration according to the content in the security mode command message.
  • the AP sends a Radio Resource Control (RRC) Security Mode Command message to the UE.
  • RRC Radio Resource Control
  • the UE performs local configuration according to the RRC security mode command, and sends an RRC security mode complete message (Security Mode Complete) to the AP after the configuration is complete.
  • the AP sends a security mode complete message (Security Mode Complete) of the Iuh interface to the AG.
  • the security mode completion message may include: a cell (IE) "chosen Integrity Protection Algorithm” and a “chosen Encryption Algorithm",
  • IE a cell
  • Chosen Integrity Protection Algorithm a cell
  • Chosen Encryption Algorithm The definition of cells in the RANAP protocol is shown in Table 2:
  • the security mode parameters are negotiated between the core network and the access network (the UE and the access point), and the security mode parameters sent by the UE for the core network (see Table 1). Returns the security mode parameters that are supported (or selected) by themselves (see Table 2).
  • the AG After receiving the security mode completion message from the AP, the AG updates the saved security mode parameters sent by the core network according to the security mode parameters selected by the AP and the UE.
  • the parameters to be saved are shown in Table 2.
  • the AG sends a Security Mode Complete message to the core network (CN), and the message content is the same as the security mode completion message of step B7.
  • the radio access bear (RAB) assignment is first performed.
  • the RAB parameter of the user equipment can be obtained in the RAB assignment process initiated by the core network. As shown in Figure 3, the RAB assignment process is as follows:
  • the core network (CN) sends an RAB Assignment Request message (RAB Assignment Request) of the Iu interface to the AG, and the message includes the RAB parameter.
  • RAB parameter is represented by a RABs To Be Setup Or Modified List (GC) parameter, and the parameters in the cell are used to configure parameters such as user plane address and service rate when establishing a service bearer.
  • GC RABs To Be Setup Or Modified List
  • the RABs To Be Setup Or Modified List cells are defined in the RANAP protocol as shown in Table 3:
  • the AG sends an RAB Assignment Request message (RAB Assignment Request) of the Iuh interface to the AP.
  • RAB Assignment Request RAB Assignment Request
  • the RANAP content in the message comes from the Iu interface RAB Assignment Request message in step C1.
  • the AP completes the network configuration according to the RAB parameters.
  • the AP sends an RB setup message (RB Setup) to the UE.
  • C6 The UE sends an RB Setup Complete message (RB Setup Complete) to the AP.
  • the AP sends an RAB Assignment Response message of the Iuh interface to the AG.
  • the RAB assignment response message includes: a cell (IE) "RABs Setup Or Modified List", which is defined in the RANAP protocol as shown in Table 4 below:
  • the negotiation between the core network and the access network (the UE and the access point) for the RAB parameters is implemented by the step C1 to the step C7, and the UE returns the selection for the RAB parameters (see Table 3) delivered by the core network.
  • RAB parameters see Table 4).
  • the RAB parameter is updated according to the AP returning the RAB parameter selected by the AP, and the RAB parameters to be recorded are shown in Table 4.
  • the AG sends an RAB Assignment Response message of the Iu interface to the core network (CN), and the content of the message is the same as the RAB assignment response message in step C7.
  • the RAB parameters saved by the AG will be used by the AG during the AP-AP handover process described later.
  • the handover control parameter is obtained by the foregoing security mode process and the RAB assignment process, so that the acquisition process of the handover control parameter is simple and easy, but the method for acquiring the handover control parameter is not unique, and it can be understood that
  • the core network may also send the handover control parameters required by the AG to the AG.
  • the specific delivery mode may be implemented by using an existing message or a newly added message, as long as the delivered message format can conform to the core network and the AG.
  • the interface specification is sufficient and does not constitute a limitation of the present invention.
  • Embodiment 2 A switching control method, as shown in FIG. 4, includes:
  • the access gateway receives the handover request message sent by the source access point of the user equipment, and switches
  • the request message includes a target access point identifier
  • the access gateway sends a handover request message to the target access point according to the target access point identifier, where the handover request message includes a pre-acquired handover control parameter.
  • D4 Receive an air interface reconfiguration complete message returned by the target access point, and establish a user plane bearer that the user equipment receives or sends data through the target access point.
  • the establishment process of the specific user plane bearer includes: the user plane of the AG new and the target AP bears, removes the user plane of the AP2, and connects the user plane of the Iu interface with the user plane lifetime of the Iuh interface.
  • the application example of the second embodiment of the present invention is applied to the 3GPP protocol.
  • the signaling flowchart is shown in Figure 5.
  • the source access point is API and the target access point is AP2.
  • the process includes:
  • the source AP sends an Iuh interface migration request message (Relocation Required) to the AG, where the message includes the wireless configuration information of the service that the UE has established.
  • the F2 After receiving the Relocation Required message, the F2 constructs a migration request message (Relocation Request) of the Iuh interface;
  • IE Cell
  • the message cells that need to be supplemented are shown in the table titled "Bold":
  • the "cell name” column is the part that needs to be filled in by the AG in the migration request message
  • the "data source” column is the information source of the cell filled in by the AG.
  • "0" is an optional cell
  • "M” is a mandatory cell
  • "C-ifPS” is a mandatory cell for a packet switched (PS) domain.
  • the "bold” font in the table is the parameter acquired by the AG during the security mode process and during the RAB assignment process, and the parameter of the ordinary font is the parameter that the AG can obtain by the prior art.
  • the F3 and the AG send a migration request message (Relocation Request) of the Iuh interface to the target AP (AP2 in the figure).
  • the target AP establishes a wireless link according to parameters in the migration request message.
  • the target AP sends a Relocation Request Ack to the AG.
  • F6 After receiving the migration request response message of the target AP, the AG fills in a migration command message (Relocation Command), and sends the migration command message to the source AP.
  • Relocation Command a migration command message
  • the information in the migration command message can be found in both the migration request response and the AG itself information.
  • F7. The source AP sends an air interface reconfiguration message to the UE, where the air interface reconfiguration message is obtained from the migration command message.
  • an RB reconfiguration message (RB Reconfiguration) is taken as an example for description.
  • F8. After completing the UE side configuration according to the air interface reconfiguration message, the UE sends an air interface reconfiguration complete message to the target AP.
  • an RB reconfiguration complete message (RB Reconfiguration Complete) is taken as an example for description.
  • the target AP sends a migration complete message (Relocation Complete) to the AG.
  • the AG refreshes the association between the Iuh interface and the user plane of the Iu interface.
  • the AG When the AG receives the migration completion message sent by the target AP, the UE has switched to the target AP and can perform uplink and downlink services normally.
  • the AG needs to refresh the association between the Iu interface and the user plane of the Iuh interface, and associate the user plane of the Iu interface with the user plane of the newly established AG-target AP (corresponding to the Iuh interface).
  • the downlink user data from the CN node is sent from the user plane between the AG-target APs to the target AP, and the uplink user data from the target AP is sent from the Iu interface user plane to the CN, thereby restoring the user plane path. .
  • Fll, AG sends a release request to the API ( Release Command );
  • the API releases the resources of the UE
  • the RAB deletion process also uses the RAB assignment process. Similar to the RAB establishment process described above, the RAB information can be updated according to the deletion result in the RAB assignment response message. When the UE changes the established RAB service, the AG needs to update the corresponding RAB information, and the process is similar to the RAB establishment.
  • the target access point may not support the source access point capability. If this happens, you can switch between the following two ways:
  • the target access point establishes the service bearer supported by the target access point according to its own capability, and after the handover succeeds, the target access point initiates modification of the service bearer on the core network side, or releases the service that the target access point does not support.
  • the manner of modifying the service bearer may be preferably selected. If the capability of the target access point cannot be modified to modify the service bearer, then the manner of releasing the unsupported service is used to complete the final handover.
  • the target AP receives the migration request message (Relocation Request) of the Iuh interface. If the bearer requirement of the service in the migration request is not met, such as the rate requirement, the target AP may first establish an RAB bearer according to its own rate capability, and record The status "AP service bearer does not match CN request". After the target AP (AP2) sends the migration completion message (Relocation Complete) of the Iuh interface to the AG, the target AP determines whether its status record is "AP service bearer and CN request does not match”. If yes, the target AP initiates the RAB renegotiation process.
  • the modification of the service bearer refer to Figure 6 for the process of modifying the service bearer on the core network side, including:
  • the target AP sends an RAB modify Request message (RAB modify Request) of the Iuh interface to the AG.
  • the AG sends an RAB modify Request message of the Iu interface to the core network (CN) node.
  • CN core network
  • the core network (CN) node sends an RAB assignment request message of the Iu interface to the AG, and the message carries a new RAB parameter, such as a rate.
  • the AG sends an RAB Assignment Request message (RAB Assignment Request) of the Iuh interface to the target AP.
  • RAB Assignment Request RAB Assignment Request
  • the target AP After the target AP completes the reconfiguration according to the new RAB parameter, it sends an RAB Assignment Response message (RAB Assignment Response) of the Iuh interface to the AG.
  • RAB Assignment Response RAB Assignment Response
  • the AG sends an RAB Assignment Response message of the Iu interface to the core network (CN) node. At this point, the modification of the service bearer is completed.
  • CN core network
  • the process of releasing the service that is not supported by the target access point is as shown in FIG. 7, which includes: HI, the target AP (AP2) sends an RAB Release Request message (RAB Release Request) of the Iuh interface to the AG.
  • RAB Release Request RAB Release Request
  • the AG sends an RAB Release Request message of the Iu interface to the core network (CN) node.
  • CN core network
  • the core network (CN) node sends an RAB Assignment Request (RAB Assignment Request) of the Iu interface to the AG, and carries a new RAB parameter, such as a rate.
  • RAB Assignment Request RAB Assignment Request
  • the AG sends an RAB Assignment Request message (RAB Assignment Request) of the Iuh interface to the target AP.
  • RAB Assignment Request RAB Assignment Request
  • the target AP After the target AP completes the reconfiguration according to the new RAB parameter, it sends an RAB Assignment Response message (RAB Assignment Response) of the Iuh interface to the AG.
  • RAB Assignment Response RAB Assignment Response
  • Manner 2 The target access point returns a handover failure message to the access gateway, and the access gateway sends a handover request to the core network, and the core network performs handover control.
  • the AG receives the Iuh interface migration failure message (Relocation Failure) of the target AP, and performs a handover request process (Relocation Request) to the core network (CN-initiated) Iu interface, and attempts to complete the AP-AP handover process through the core network.
  • Relocation Failure the Iuh interface migration failure message
  • Relocation Request a handover request process
  • the mode 1 and the mode 2 can be freely selected to complete the handover.
  • the mode 1 can be preferentially selected to complete the handover.
  • the two modes are implemented to implement the handover, which may be a useful supplement to the method of the first embodiment, so that the solution is more complete and suitable for more. Complex networking scenarios.
  • the program can be stored in a computer readable storage medium.
  • the storage medium can include: ROM, RAM, disk or CD, etc.
  • Embodiment 3 A handover control apparatus, where the apparatus may be an access gateway, and a schematic structural diagram is shown in FIG. 8 , including:
  • the handover request receiving unit 610 is configured to receive a handover request message sent by a source access point of the user equipment, where the handover request message includes a target access point identifier;
  • the switching control unit 620 is configured to control, according to the pre-acquired handover control parameter, the handover of the user equipment from the source access point to the target access point.
  • Embodiment 4 A handover control apparatus, as shown in FIG. 9, includes: a handover request receiving unit 710, configured to receive a handover request message sent by a source access point of a user equipment, where the handover request message includes a target access point Identification
  • the handover control parameter obtaining unit 730 is configured to acquire the handover control parameter for use by the handover control unit 720.
  • the handover control parameter includes: a security mode parameter of the user equipment and an RAB parameter of the user equipment.
  • the switching control unit 720 is configured to control, according to the pre-acquired handover control parameter, the handover of the user equipment from the source access point to the target access point.
  • the switching control unit 720 may specifically include:
  • a first subunit 721, configured to send a handover request message to the target access point, where the handover request message includes a pre-acquired handover control parameter;
  • the second sub-unit 722 is configured to: after receiving the message that the network access is configured according to the pre-acquired handover control parameter returned by the target access point, send an air interface reconfiguration message to the target access point;
  • the third subunit 723 is configured to receive an air interface reconfiguration complete message returned by the target access point, and establish a user plane bearer that the user equipment receives or sends data through the target access point.
  • a determining unit 740 configured to determine whether the target access point is within the management range of the switching control device
  • the handover control unit 720 is further configured to send a handover request message to the core network, and perform handover control by the core network.
  • the determining unit 740 can determine whether the target access point is within the management range of the handover control device according to the target access point identifier received by the handover request receiving unit 710.
  • the switching control apparatus provided in Embodiment 3 and Embodiment 4 of the present invention may be integrated on an access gateway or a similar access control device to implement a handover control function.
  • the present invention also provides a switching control system, including the cutting of the third or fourth embodiment. And a control device, and a source access point and a target access point in communication with the switching control device. It will be understood by those skilled in the art that all or part of the steps of implementing the foregoing embodiments may be performed by hardware related to program instructions.
  • the foregoing program may be stored in a computer readable storage medium, and when executed, the program includes The foregoing steps of the method embodiment; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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Description

切换控制方法、 装置和系统 本申请要求于 2009 年 7 月 29 日提交中国专利局、 申请号为 200910055821.4、 发明名称为"切换控制方法、 装置和系统"的中国专利申请 的优先权, 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域, 具体涉及切换控制方法、 装置和系统。 背景技术
毫微微蜂窝基站(Femtocell, 也被称作家庭基站或 3G接入点 )技术是 一种扩展移动通信室内覆盖的解决方案,可以把用户设备( User Equipment, UE )发出的话音和数据呼叫传输到基于标准接口的第三代移动通信技术 ( The 3rd Generation^ G )核心网络,且它的家庭接入点( Access point, AP ) 即插即用, 可连接到任何现有的基于 IP的传送网络。
3G工作在 2GHz频段, 其无线传播特性特别是建筑物穿透特性较差, 导致室内服务质量的下降。 而 Femtocell的出现可以有效提高室内覆盖范围 和服务质量。
在对现有技术的研究和实践过程中,本发明的发明人发现,在 3GPP R8 定义的毫微微蜂窝( femto )架构下, 目前不支持用户设备 AP到 AP的切换。 由于 AP的覆盖范围小, 用户设备从一个 AP切换到另一个 AP的过程比较 频繁, 如果借鉴接入点到宏网络的切换流程来实现 AP到 AP的切换, 切换 控制需要由核心网 (Core Network, CN )节点完成, 会对核心网设备产生 较大的负载影响。 发明内容
本发明实施例提供切切换控制方法、 装置和系统, 可以降低核心网负 载。
本发明实施例提供的一种切换控制方法, 包括:
接入网关接收用户设备的源接入点发送的切换请求消息, 所述切换请 求消息包含目标接入点标识; 所述接入网关根据预先获取的切换控制参数, 对所述用户设备从所述 源接入点到目标接入点的切换进行控制。
本发明实施例提供的一种切换控制装置, 该装置为接入网关, 包括: 切换请求接收单元, 用于接收用户设备的源接入点发送的切换请求消 息, 所述切换请求消息包含目标接入点标识;
切换控制单元, 用于根据预先获取的切换控制参数, 对所述用户设备 从所述源接入点到目标接入点的切换进行控制。
本发明实施例提供的一种切换控制系统, 包括: 前述的切换控制装置, 以及与该切换控制装置通信的源接入点和目标接入点。
本发明实施例中, 接入网关根据预先获取的切换控制参数, 对用户设 备从源接入点到目标接入点的切换进行控制。 通过接入网关实现切换控制, 可以降低核心网设备的负载, 使得系统运行更加稳定, 同时减少接入网关 和核心网的信令交互, 节约了带宽。 附图说明
图 1是本发明实施例一切换控制方法的流程图;
图 2是本发明实施例中接入网关在核心网发起安全模式过程中获取安 全模式参数的流程图;
图 3是本发明实施例中接入网关在 RAB指配流程中获取 RAB参数的流 程图;
图 4是本发明实施例二切换控制方法的流程图;
图 5是本发明实施例二应用例的信令流程图;
图 6本发明实施例中修改核心网侧的业务承载的信令流程图;
图 7为本发明实施例中释放目标接入点不支持的业务的流程;
图 8是本发明实施例三切换控制装置的结构示意图;
图 9是本发明实施例四切换控制装置的结构示意图。 具体实施方式
本发明实施例提供切换控制方法、 装置和系统, 以下分别进行详细说 明。 值得说明的是, 本发明实施例主要以宽带码分多址 (Wideband Code Division Multiple Access, 简称: WCDMA ) 系统为例进行描述。 但可以理 解的是, 在其他系统, 比如全球移动通信系统(Global System For Mobile Communications , 简 称 : GSM )、 时分 - 同 步码分多 址(Time Division- Synchronous Code Division Multiple Access , 简称: TD-SCDMA)、 码分多址 CDMA2000、 全球微波互联接入(Worldwide Interoperability for Microwave Access, 简称: WIMAX )和长期演进系统 ( Long Term Evolution, 简称: LTE )等系统中, 本实施例提供的方案同样可以釆用。
实施例一、 一种切换控制方法, 流程如图 1所示, 包括:
A1 , 接入网关 ( Access Gateway, AG )接收用户设备的源接入点发送 的切换请求消息, 切换请求消息包含目标接入点标识;
A2, 接入网关根据预先获取的切换控制参数, 对用户设备从源接入点 到目标接入点的切换进行控制。
本发明实施例中, 接入网关预先获取切换控制参数, 并根据切换控制 参数对用户设备从源接入点到目标接入点的切换进行控制, 通过接入网关 实现切换控制, 可以降低核心网设备的负载, 使得系统运行更加稳定, 同 时减少接入网关和核心网的信令交互, 节约了带宽。
可以理解, 本发明实施例的方案可以进一步包括: 判断目标接入点是 否在接入网关的管理范围内, 若不在, 则将切换请求消息发送给核心网, 由核心网进行切换控制。
可以理解, 接入网关对于其管理的接入点均进行记录以实现数据的转 发, 具体的记录方式通过保存其管理的接入点标识列表或者路由表的方式 实现。 因此, 当接入网关收到用户设备的携带目标接入点标识的切换控制 请求, 则可以根据目标接入点的标识判断得出该目标接入点是否在该接入 网关管理的范围内。
下面对本发明实施例中, 获取切换控制参数的过程进行详细描述, 本 发明实施例中的切换控制参数可以包括: 用户设备的安全模式参数和用户 设备的 RAB参数。 可以理解, 切换控制参数还可以包括其他现有技术中接 入网关自身已有的参数或者接入网关通过已有技术可以获得的参数, 本发 明实施例强调获取的切换控制参数是在现有技术中的接入网关没有获得 的、 并且在切换控制过程中需要使用的参数。
获取用户设备的安全模式参数可以是接入网关在核心网发起安全模式 过程中获取, 具体流程如图 2所示, 包括:
Bl、 核心网 (CN ) 节点向 AG发送 Iu接口(RNC/AG和 CN节点之间的接 口)的安全模式命令消息 ( Security Mode Command ), 消息中包含安全模式 参数;
本实施例中, 核心网节点可以是移动交换中心 ( Mobile Switching Center, MSC )或者服务 GPRS业务支持节点( Serving GPRS Support Node , SGSN )或具有类似网络控制功能的核心网设备。
本例中, 安全模式参数可以为: "完整性保护信息 ( Integrity Protection Information )" 信元和 "力口密信息 (Encryption Information)" 信元, 这两个信 元在无线接入网应用协议 ( Radio Access Network Application Protocol , RANAP )协议中的定义如表 1所示:
Figure imgf000006_0001
Figure imgf000006_0002
B2、 AG收到 CN节点的安全模式命令消息之后, 保存上述表 1中的安全 模式参数。
B3、 AG向 AP发送 Iuh接口(AP和 AG之间的接口)的安全模式命令消息 ( Security Mode Command ), 该消息中的 RANAP内容来自步骤 B1中的 Iu接 口安全模式命令消息。
B4、 AP根据安全模式命令消息中的内容进行网络配置。
本实施例中, AP进行网络配置的过程釆用现有的常规方式实现, 此处 不再赘述。
B5、 AP向 UE发送无线资源控制 (Radio Resource Control, RRC)安全模 式命令消息 ( Security Mode Command );
B6、 UE根据 RRC安全模式命令进行本地配置, 配置完成后向 AP发送 RRC安全模式完成消息 ( Security Mode Complete )。 B7、 AP向 AG发送 Iuh接口的安全模式完成消息 ( Security Mode Complete );
本发明实施例中, 安全模式完成消息可以包括: 信元(IE ) "选中的完 整性保护算法" ( Chosen Integrity Protection Algorithm )和 "选中的力口密算 法 " ( Chosen Encryption Algorithm ) , 这两个信元在 RANAP协议中的定义如 表 2所示:
Figure imgf000007_0001
Figure imgf000007_0002
"选中的完整性保护算法" ( Chosen Integrity Protection Algorithm )和 "选中的力口密算法" ( Chosen Encryption Algorithm ) , 这两个信元的内容是
UE和 ΑΡ根据核心网下发的安全模式参数选择的安全模式的结果。
可以理解,通过步骤 Β 1至步骤 Β7实现了核心网和接入网( UE和接入点) 之间针对安全模式参数的协商, UE针对核心网下发的安全模式参数(参见 表 1 ) , 返回自身支持(或选择) 的安全模式参数 (参见表 2 )。
Β8、 当 AG收到来自 AP的安全模式完成消息之后, 根据 AP和 UE选择的 安全模式参数, 更新保存的核心网下发的安全模式参数, 需要保存的参数 参见表 2所示。
B9、 AG向核心网( CN )发送 Iu接口的安全模式完成消息( Security Mode Complete ) , 消息内容与步骤 B7的安全模式完成消息相同。
保存的安全模式参数在后续描述的 AP-AP切换过程中,将被 AG所使用。 基于现有的 3GPP流程, 当用户使用业务的时候, 首先进行无线接入承 载(Radio Access Bear, RAB )指配。 本发明实施例中, 用户设备的 RAB参 数可以在核心网发起的 RAB指配过程中获取, 如图 3所示, RAB指配流程如 下:
Cl、 核心网 (CN ) 向 AG发送 Iu接口的 RAB指配请求消息 ( RAB Assignment Request ) , 消息中包含 RAB参数。 本例中 , RAB参数通过将要建立或更改的 RAB列表( RABs To Be Setup Or Modified List )信元表示,该信元中的参数用于建立业务承载时配置用户 面地址、业务速率等参数。 RABs To Be Setup Or Modified List信元在 RANAP 协议中的定义如表 3所示:
Figure imgf000008_0001
Figure imgf000008_0002
C2、 AG收到 RAB指配请求消息之后, AG记录 RAB参数, 记录的参数 参见表 3。
C3、 AG向 AP发送 Iuh接口的 RAB指配请求消息 ( RAB Assignment Request )。
该消息中的 RANAP内容来自步骤 C1中的 Iu接口 RAB指配请求消息。
C4、 AP根据 RAB参数完成网络配置。
C5、 AP向 UE发送 RB建立消息 ( RB Setup )。 C6、 UE向 AP发送 RB建立完成消息 ( RB Setup Complete )。
C7、 AP向 AG发送 Iuh接口的 RAB指配响应消息 ( RAB Assignment Response )。
该 RAB指配响应消息中包括:信元( IE ) "已经建立或更改的 RAB列表" ( RABs Setup Or Modified List ), 这个信元在 RANAP协议中的定义如下表 4 所示:
Figure imgf000009_0001
Figure imgf000009_0002
可以理解,通过步骤 C 1至步骤 C7实现了核心网和接入网( UE和接入点) 之间针对 RAB参数的协商, UE针对核心网下发的 RAB参数(参见表 3 ), 返 回选择的 RAB参数 (参见表 4 )。
C8、 当 AG收到来自 AP的 RAB指配响应消息之后, 根据 AP返回用户选 择的 RAB参数, 更新记录的 RAB参数, 需要记录的 RAB参数参见表 4。
C9、 AG向核心网 ( CN ) 发送 Iu接口的 RAB指配响应消息 ( RAB Assignment Response ), 消息内容与步骤 C7中的 RAB指配响应消息相同。
AG保存的 RAB参数在后续描述的 AP-AP切换过程中, 将被 AG所使用。 本发明实施例中, 切换控制参数通过上述的安全模式过程和 RAB指配 过程获取, 使得切换控制参数的获取流程简单易行, 但是这种获取切换控 制参数的方法并不是唯一的, 可以理解, 也可以由核心网将 AG需要的切换 控制参数下发给 AG, 具体的下发方式可以釆用现有的消息或者新增的消息 实现, 只要下发的消息格式可以符合核心网和 AG之间的接口规范即可, 不 构成对本发明的限制。
实施例二、 一种切换控制方法, 流程图如图 4所示, 包括:
D1 , 接入网关接收用户设备的源接入点发送的切换请求消息, 切换请 求消息包含目标接入点标识;
D2,接入网关根据该目标接入点标识向目标接入点发送切换请求消息, 切换请求消息包含预先获取的切换控制参数;
D3 , 接收目标接入点返回的根据切换控制参数完成网络配置的消息, 并向目标接入点发送空口重配置消息;
D4, 接收目标接入点返回的空口重新配置完成消息, 建立用户设备通 过目标接入点接收或发送数据的用户面承载。
具体用户面承载的建立过程包括: AG新建和目标 AP的用户面承载, 拆 除和 AP2的用户面 载, 并且将 Iu接口的用户面 载和 Iuh接口的用户面寿 载相连接。
本发明实施例二应用于 3GPP协议的应用例, 信令流程图如图 5所示, 图中源接入点为 API , 目标接入点为 AP2 , 流程包括:
Fl、 源 AP (图中的 API ) 向 AG发送 Iuh接口迁移请求消息 (Relocation Required ),消息中包含该 UE已经建立业务的无线配置信息。
F2、 AG收到 Relocation Required消息之后, 构造 Iuh接口的迁移请求消 息 ( Relocation Request );
Relocation Request中的部分信元 ( IE ) 可以从 Relocation Required中获 取,其余部分可以由 AG根据之前保存的该 UE的 RAB参数和安全模式参数进 行补充。 需要补充的消息信元如表 5 "加粗" 字体所示:
Figure imgf000010_0001
Figure imgf000010_0002
RABs To Be Setup List O
>RABs To Be Setup Item
IEs
»RAB ID M AG保存的 RAB建立信息
»NAS Synchronisation
O AG保存的 RAB建立信息
Indicator
AG保存的 RAB建立信息, 加上更新
»RAB Parameters M
的 RAB响应消息中信元
»Data Volume
Reporting C - ifPS AG保存的 RAB建立信息
Indication
» PDP Type
C - ifPS AG保存的 RAB建立信息
Information
»User Plane
M
Information
»>User Plane Mode M AG保存的 RAB建立信息
»>UP Mode Versions M AG保存的 RAB建立信息
»Transport Layer
M 根据 AG自己的用户面填写
Address
»Iu Transport
M 根据 AG自己的用户面填写
Association
»Service Handover O AG保存的 RAB建立信息
» Alternative RAB
O 不填写
Parameter Values
»GERAN BSC
Container o AG保存的 RAB建立信息
Integrity Protection
Information o AG保存的安全模式信息
Encryption Information o AG保存的安全模式信息
Iu Signalling Connection
M 由 AG管理和分配该标识
Identifier
Global CN-ID 0 不填写
SNA Access Information 0 不填写
UESBI-Iu 0 不填写
表 5中, "信元名称" 列是在迁移请求消息中需要 AG填写的部分, "数 据来源" 列是 AG填写的信元的信息来源。 其中 "0" 为可选信元, "M" 为 必选信元, "C-ifPS" 为分组交换(PS )域必选信元。 表中 "加粗" 字体为 在安全模式过程中和 RAB指配过程中 AG获取的参数, 而普通字体的参数为 AG可以通过现有技术获得的参数。 F3、 AG完成迁移请求消息填写之后, 向目标 AP (图中的 AP2 )发送 Iuh 接口的迁移请求消息 ( Relocation Request )。
F4、 目标 AP根据迁移请求消息中的参数建立无线链路。
F5、 目标 AP向 AG发送迁移请求应答消息 ( Relocation Request Ack )。 F6、 当 AG收到目标 AP的迁移请求应答消息之后, 填写迁移命令消息 ( Relocation Command ), 并向源 AP发送该迁移命令消息。
迁移命令消息中的信息在迁移请求应答和 AG本身信息中都可以找到。 F7、 源 AP向 UE发送空口重配置消息, 该空口重配置消息是从迁移命令 消息中获取的。
在本实施例中以 RB重配置消息 ( RB Reconfiguration )为例进行说明。 F8、 UE根据空口重配置消息完成 UE侧配置之后, 向目标 AP发送空口 重配置完成消息。
在本实施例中以 RB重配置完成消息( RB Reconfiguration Complete )为 例进行描述。
F9、 目标 AP向 AG发送迁移完成消息 ( Relocation Complete )。
F 10、 AG刷新 Iuh接口和 Iu接口用户面的关联。
当 AG收到目标 AP发送的迁移完成消息, 说明 UE已经切换到目标 AP, 能够正常进行上下行业务。 AG需要刷新 Iu接口和 Iuh接口用户面的关联, 将 Iu接口用户面和新建立的 AG-目标 AP (对应 Iuh接口)用户面关联起来。 关 联刷新之后, 下行来自 CN节点的用户数据会从 AG-目标 AP之间的用户面发 给目标 AP, 上行来自目标 AP的用户数据会从 Iu接口用户面发给 CN,从而恢 复用户面的通路。
Fll , AG向 API发送释放请求( Release Command );
F12, API释放该 UE的资源;
F13 , API向 AG返回释放完成响应 ( Release Complete )。
当 UE释放已经建立的 RAB业务的时候, AG需要删除对应的 RAB信息, 保持和 UE实际业务一致。 RAB删除过程也是使用 RAB指配流程, 和前面描 述的 RAB建立过程相似, 根据 RAB指配响应消息中的删除结果更新 RAB信 息即可。 当 UE更改已经建立的 RAB业务的时候, AG需要更新对应的 RAB信息 , 流程和 RAB建立类似。
本发明实施例中, 目标接入点收到切换请求消息后, 可能会出现目标 接入点不支持源接入点能力的情况。 如果出现这种情况, 可以釆取以下两 种方式实现切换:
方式一、 目标接入点按照自身的能力建立目标接入点支持的业务承载, 并在切换成功之后, 目标接入点发起修改核心网侧的业务承载, 或者释放 目标接入点不支持的业务。 可以理解在实际应用时, 可以优选选择修改业 务承载的方式, 若目标接入点的能力无法实现修改业务承载, 则再釆用释 放不支持的业务的方式以完成最终的切换。
本实施例中, 目标 AP 收到 Iuh接口的迁移请求消息 (Relocation Request ), 如果无法满足迁移请求中业务的承载要求, 比如速率要求, 目标 AP可以先按照自己的速率能力建立 RAB承载, 并记录该状态 "AP业务承 载和 CN请求不符"。 目标 AP ( AP2 ) 向 AG发送 Iuh接口的迁移完成消息 ( Relocation Complete )之后, 目标 AP判断自己的状态记录是否是 "AP业 务承载和 CN请求不符", 如果是, 目标 AP发起 RAB重协商过程以实现对 业务承载的修改, 对于修改核心网侧的业务承载的过程参见图 6所示, 包 括:
G1、目标 AP( AP2 )向 AG发送 Iuh接口的 RAB修改请求消息( RAB modify Request )。
G2、 AG向核心网 (CN ) 节点发送 Iu接口的 RAB修改请求消息 ( RAB modify Request )。
G3、 核心网 (CN ) 节点向 AG发送 Iu接口的 RAB指配请求消息, 消息 中携带新的 RAB参数, 比如速率等。
G4、 AG向目标 AP发送 Iuh接口的 RAB指配请求消息 ( RAB Assignment Request )。
G5、目标 AP按照新 RAB参数完成重配置之后,向 AG发送 Iuh接口的 RAB 指配响应消息 ( RAB Assignment Response )。
G6、 AG向核心网 (CN ) 节点发送 Iu接口的 RAB指配响应消息 ( RAB Assignment Response )。 至此, 完成了对业务承载的修改。
本实施例中, 释放目标接入点不支持的业务的流程如图 7所示, 包括: HI、 目标 AP ( AP2 ) 向 AG发送 Iuh接口的 RAB释放请求消息 ( RAB Release Request )。
H2、 AG向核心网 (CN ) 节点发送 Iu接口的 RAB释放请求消息 ( RAB Release Request )。
H3、 核心网 ( CN ) 节点向 AG发送 Iu接口的 RAB指配消息 ( RAB Assignment Request ), 携带新的 RAB参数, 比如速率等。
H4、 AG向目标 AP发送 Iuh接口的 RAB指配请求消息 ( RAB Assignment Request )。
H5、目标 AP按照新 RAB参数完成重配置之后,向 AG发送 Iuh接口的 RAB 指配响应消息 ( RAB Assignment Response )。
H6、 AG向核心网 (CN ) 节点发送 Iu接口的 RAB指配响应消息 ( RAB Assignment Response ), 完成业务修改。
方式二、 目标接入点向接入网关返回切换失败消息, 接入网关向核心 网发送切换请求, 由核心网进行切换控制。
具体的, AG收到目标 AP的 Iuh接口迁移失败消息( Relocation Failure ), 向核心网 ( CN发起 ) Iu接口的迁移请求消息( Relocation Request ), 尝试经 过核心网完成 AP-AP的切换过程。
可以理解, 本发明实施例中, 可以自由选择方式一和方式二完成切换, 为了尽量不加重核心网的负担, 可以优先选择方式一完成切换。
本发明实施例二中, 当出现目标接入点不支持源接入点能力的情况时, 给出了两种方式实现切换, 可以作为实施例一方法的有益补充, 使得方案 更加完整, 适合更加复杂的组网场景。
本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分 步骤是可以通过程序来指令相关的硬件来完成, 该程序可以存储于一计算 机可读存储介质中, 存储介质可以包括: ROM、 RAM, 磁盘或光盘等。
实施例三、 一种切换控制装置, 该装置可以是接入网关, 结构示意图 如图 8所示, 包括: 切换请求接收单元 610, 用于接收用户设备的源接入点发送的切换请求 消息, 切换请求消息包含目标接入点标识;
切换控制单元 620 , 用于根据预先获取的切换控制参数对用户设备从源 接入点到目标接入点的切换进行控制。
实施例四、 一种切换控制装置, 结构示意图如图 9所示, 包括: 切换请求接收单元 710, 用于接收用户设备的源接入点发送的切换请求 消息, 切换请求消息包含目标接入点标识;
切换控制参数获取单元 730 , 用于获取切换控制参数供切换控制单元 720使用, 切换控制参数包括: 用户设备的安全模式参数和用户设备的 RAB 参数。
切换控制单元 720 , 用于根据预先获取的切换控制参数对用户设备从源 接入点到目标接入点的切换进行控制。
具体实现时, 切换控制单元 720可以具体包括:
第一子单元 721 , 用于向目标接入点发送切换请求消息, 该切换请求消 息包含预先获取的切换控制参数;
第二子单元 722, 用于接收目标接入点返回的根据预先获取的切换控制 参数完成网络配置的消息后, 向目标接入点发送空口重配置消息;
第三子单元 723 , 用于接收目标接入点返回的空口重新配置完成消息 , 建立用户设备通过目标接入点接收或发送数据的用户面承载。
可以理解, 本实施例中的切换控制装置还可以包括:
判断单元 740 , 用于判断目标接入点是否在切换控制装置的管理范围 内;
若判断单元的判断结果为否, 则切换控制单元 720还用于将切换请求 消息发送给核心网, 由核心网进行切换控制。
可以理解, 本实施例中, 判断单元 740可以根据切换请求接收单元 710 接收的目标接入点标识判断目标接入点是否在切换控制装置的管理范围 内。
本发明实施例三和实施例四提供的切换控制装置可以集成于接入网关 或类似的接入控制设备上实现切换控制功能。
可以理解, 本发明还提供一种切换控制系统, 包括实施例三或四的切 换控制装置, 以及与上述切换控制装置通信的源接入点和目标接入点。 本领域普通技术人员可以理解: 实现上述实施例的全部或部分步骤可 以通过程序指令相关的硬件来完成, 前述的程序可以存储于一计算机可读 取存储介质中, 该程序在执行时, 执行包括上述方法实施例的步骤; 而前 述的存储介质包括: ROM、 RAM, 磁碟或者光盘等各种可以存储程序代码 的介质。
以上对本发明实施例所提供的切换控制方法、 装置和系统进行了详细 上实施例的说明只是用于帮助理解本发明的方法及其核心思想; 同时, 对 于本领域的一般技术人员, 依据本发明的思想, 在具体实施方式及应用范 围上均会有改变之处, 综上所述, 本说明书内容不应理解为对本发明的限 制。

Claims

权 利 要求 书
1、 一种切换控制方法, 其特征在于, 包括:
接入网关接收用户设备的源接入点发送的切换请求消息, 所述切换请 求消息包含目标接入点标识;
所述接入网关根据预先获取的切换控制参数, 对所述用户设备从所述 源接入点到目标接入点的切换进行控制。
2、 如权利要求 1所述的方法, 其特征在于, 所述接入网关根据预先获 取的切换控制参数, 对所述用户设备从所述源接入点到目标接入点的切换 进行控制包括:
向目标接入点发送切换请求消息, 所述切换请求消息包含所述预先获 取的切换控制参数;
接收所述目标接入点返回的根据所述切换控制参数完成网络配置的消 息, 并向所述目标接入点发送空口重配置消息;
接收目标接入点返回的空口重新配置完成消息, 建立所述用户设备通 过所述目标接入点接收或发送数据的用户面承载。
3、 如权利要求 1所述的方法, 其特征在于, 所述切换控制参数包括: 所述用户设备的安全模式参数和用户设备的无线接入承载 RAB参数。
4、 如权利要求 3所述的方法, 其特征在于, 还包括: 所述接入网关在 核心网发起安全模式过程中, 获取所述用户设备的安全模式参数。
5、 如权利要求 3所述的方法, 其特征在于, 还包括: 所述接入网关在 核心网发起的 RAB指配过程中, 获取所述用户设备的 RAB参数。
6、 如权利要求 1至 5任一项所述的方法, 其特征在于, 接入网关接收 用户设备的源接入点发送的切换请求消息之后, 进一步包括:
判断目标接入点是否在所述接入网关的管理范围内, 若不在, 则将所 述切换请求消息发送给核心网, 由核心网进行切换控制。
7、 如权利要求 1至 5任一项所述的方法, 其特征在于, 所述目标接入 点收到所述切换请求消息后, 若目标接入点不支持所述源接入点的能力, 则目标接入点按照自身的能力建立目标接入点支持的业务承载, 并在切换 成功之后,发起修改核心网侧的业务承载, 或者释放目标接入点不支持的业 务。
8、 如权利要求 1至 5任一项所述的方法, 其特征在于, 若目标接入点 向所述接入网关返回切换失败消息, 则所述接入网关向核心网发送切换请 求, 由所述核心网进行切换控制。
9、 如权利要求 1至 8任一项所述的方法, 其特征在于, 所述接入点为 毫微微蜂窝基站。
10、 如权利要求 1至 9任一项所述的方法, 其特征在于, 所述接入网 关为管理接入点的接入网关。
11、 一种切换控制装置, 所述切换控制装置为接入网关, 其特征在于, 包括:
切换请求接收单元, 用于接收用户设备的源接入点发送的切换请求消 息, 所述切换请求消息包含目标接入点标识;
切换控制单元, 用于根据预先获取的切换控制参数, 对所述用户设备 从所述源接入点到目标接入点的切换进行控制。
12、 如权利要求 11所述的切换控制装置, 其特征在于, 切换控制单元 包括:
第一子单元, 用于向目标接入点发送切换请求消息, 所述切换请求消 息包含所述预先获取的切换控制参数;
第二子单元, 用于接收所述目标接入点返回的根据所述切换控制参数 完成网络配置的消息后, 向所述目标接入点发送空口重配置消息;
第三子单元, 用于接收目标接入点返回的空口重新配置完成消息, 建 立所述用户设备通过所述目标接入点接收或发送数据的用户面承载。
13、 如权利要求 11所述的切换控制装置, 其特征在于, 还包括: 切换控制参数获取单元, 用于获取切换控制参数供所述切换控制单元 使用,所述切换控制参数包括:用户设备的安全模式参数和用户设备的 RAB 参数。
14、 如权利要求 11至 13任一项所述的切换控制装置, 其特征在于, 还包括:
判断单元, 用于判断所述目标接入点是否在所述接入网关的管理范围 内;
若所述判断单元的判断结果为否, 则所述切换控制单元还用于将所述 切换请求消息发送给核心网, 由核心网进行切换控制。
15、 如权利要求 11至 14任一项所述的切换控制装置, 其特征在于, 所述接入点为毫微微蜂窝基站。
16、 如权利要求 11至 15任一项所述的切换控制装置, 其特征在于, 所述接入网关为管理接入点的接入网关。
17、 一种切换控制系统, 其特征在于, 包括: 如权利要求 11至 16任 一项所述的切换控制装置, 以及与所述切换控制装置通信的源接入点和目 标接入点。
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