WO2012022203A1 - 一种实现切换的方法及系统 - Google Patents

一种实现切换的方法及系统 Download PDF

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Publication number
WO2012022203A1
WO2012022203A1 PCT/CN2011/076867 CN2011076867W WO2012022203A1 WO 2012022203 A1 WO2012022203 A1 WO 2012022203A1 CN 2011076867 W CN2011076867 W CN 2011076867W WO 2012022203 A1 WO2012022203 A1 WO 2012022203A1
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WIPO (PCT)
Prior art keywords
network element
target
base station
handover
switching network
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PCT/CN2011/076867
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English (en)
French (fr)
Inventor
王昇明
刘磊
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中兴通讯股份有限公司
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Publication of WO2012022203A1 publication Critical patent/WO2012022203A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0079—Transmission or use of information for re-establishing the radio link in case of hand-off failure or rejection

Definitions

  • the present invention relates to a home base station technology, and more particularly to a method and system for implementing handover. Background technique
  • the home base station is a small, low-power base station deployed in indoor places such as homes and offices. Its main function is to provide users with higher service rates and lower the cost of using high-speed services. At the same time, it compensates for the existing distribution. Insufficient coverage of cellular wireless communication systems.
  • the advantages of home base stations are affordability, convenience, low power output, plug and play, and more.
  • the home base station user is connected to the home (evolved) base station access network (H(e)NB AN, Home (e) NodeB Access Network, referred to herein as the home base station access network).
  • the core network network where the H(e)NB AN is composed of a home (evolved) base station (H(e)NB, Home (e)NodeB, referred to herein as a home base station) and a home (evolved) base station gateway (H(e) NB GW, Home (e) NodeB Gateway, referred to herein as the home base station gateway).
  • HeNB evolved home base station
  • the HeNB may directly connect to the MME without passing through the HeNB GW.
  • the main functions of the H(e)NB GW include: processing registration and access control of the home base station, verifying the home base station, and exchanging data of the core network and the home base station.
  • the home (evolved) base station management system (H(e)MS, referred to herein as the home base station management system) performs operation and maintenance management on the home base station, and configures and controls the home base station according to the operator's requirements, the most important being H(e)NB.
  • the configuration management function is implemented, including verification of location information, parameter configuration for H(e)NB, mainly related to parameter configuration at the core network level, parameter configuration on the radio access network side, and parameter configuration of radio frequency (RF).
  • RF radio frequency
  • CSG Closed Subscriber Group
  • the access modes of the cell are classified into three types: a Closed access mode, a Hybrid access mode, and an Open access mode, which are used to describe a cell having a CSG attribute.
  • a closed access mode a cell is also called a CSG cell.
  • CSG cell only users who have signed a CSG with the cell can access the CSG cell.
  • the CSG cell cannot be accessed.
  • Hybrid access mode For the Hybrid access mode.
  • a cell also called a Hybrid cell, for a Hybrid cell, except that the user who subscribes to the CSG of the cell can access, there is no sign and the charging is different; for the Open mode cell, any user can access, in the connection
  • the incoming control is the same as the normal macro (Macro) cell.
  • the inter-cell interference is increased, which brings new challenges to the processing of interference. For example, for a CSG cell that the UE cannot access, the UE can view it as an interference cell.
  • the working location of the home base station is likely to be in the coverage area of the macro base station, so that it is impossible to predict the relationship between the home base station and the macro base station from the perspective of network planning. Interference, so that the pre-configuration of parameters cannot be used to avoid interference.
  • the Non-CSG terminal is a terminal that does not have a CSG attribute, that is, the Non-CSG terminal cannot identify the CSG cell, and cannot perform initial access judgment on the CSG cell.
  • the initial access or handover is not initiated in the case that the access cannot be performed, so that the CSG cell cannot be in this case.
  • the existence of interference is found by the failure condition of the above handover to the CSG cell.
  • the currently available method is: The macro cell collects the measurement report of the terminal, determines whether there is interference caused by the CSG cell, and transmits the measurement result to the CSG cell by the CSG. The cell calculates the judgment and makes a corresponding processing of the interference.
  • the number of messages transmitted on the network side is excessive.
  • a state of a new home base station (including any CSG cell) is also proposed in the prior art.
  • the home base station allows all terminals (including subscription and The non-subscription terminal accesses, but does not provide services for the terminal, and uses the measurement reporting information of the terminal during the period of the terminal access, the home base station can detect the interference to the neighboring neighboring area, and adjust the transmission of the home base station itself.
  • the prevention of interference by power and frequency called this new state is the state of training (TRAINNING). Since the Hybrid access mode and the cell of the Open access mode allow all terminals to access, no large interference is caused, and only the CSG cell is considered herein.
  • the home base station in the TRAINNING state performs normal broadcast on the air interface, and from the terminal point of view, the CSG cell is changed. It is treated as a Hybrid cell, which allows access to all terminals.
  • the terminal (including the home base station cell) in the Macro cell still performs measurement and measurement reporting on the cell, and inevitably initiates handover to the home base station cell.
  • most of the terminals in the connected state of the source cell have services.
  • the handover to the home base station occurs, the home base station cannot provide the corresponding service, thereby causing the handover failure. That is to say, in the prior art, only the handover determination is performed according to the measurement of the terminal, and the source base station may initiate an invalid handover to the home base station in the TRAINNING state.
  • the main purpose of the present invention is to provide a method and system for implementing handover, which can avoid repeated generation of invalid handover, and reduce the number of invalid handovers initiated by the source switching network element. Thereby improving network performance.
  • a method for implementing handover, when the handover fails includes:
  • the source switching network element receives the failure information, determines that the failure information includes the target base station status information, and suspends the request handover.
  • the method further includes: the target switching network element notifying the source switching network element of the failure information. Notifying the source switching network element of the failure information to the target switching network element includes:
  • the target switching network element notifies the core network element of the failure information, and the core network element notifies the source switching network element of the failure information obtained.
  • the receiving, by the source switching network element, the failure information includes: the core network element directly notifying the failure information to the source switching network element.
  • the failure information is carried in a handover failure response message
  • the handover failure response message is: a handover failure message, or a handover preparation failure message, or a relocation failure message, or a relocation preparation failure message.
  • the source switching network element suspension request switching includes:
  • the source switching network element does not initiate a handover to the target cell within a preset duration; the failure information further includes a duration of a state of the target base station displayed by the target base station state information;
  • the source switching network element suspending request handover includes: the source switching network element no longer initiates handover to the target cell during the state duration.
  • the status of the target base station displayed by the target base station status information is: a training working status.
  • the source switching network element is a source base station, or a source home base station, or a source radio network controller RNC; the target switching network element is a target base station, or a target home base station, or a target RNC, or a target home base station gateway.
  • the core network element is a mobility management entity MME; in the universal mobile communication system UMTS, the core network element is a core network entity CN.
  • a system for implementing handover includes at least a source switching network element, configured to receive failure information, determine that the failure information includes target base station status information, and suspend request switching.
  • the system further includes a target switching network element, configured to notify the source switching network element of the failure information when the handover fails.
  • the system further includes a core network element, where the target switching network element is further configured to notify the core network element of the failure information;
  • the core network element is configured to notify the source switching network element of the obtained failure information.
  • the system also includes a core network element for directly reporting failure information to the source switching network element.
  • the source switching network element is a source base station, or a source home base station, or a source radio network controller RNC;
  • the target switching network element is a target base station, or a target home base station, or a target RNC, or a target home base station gateway.
  • the core network element is a mobility management entity MME; in the universal mobile communication system UMTS, the core network element is a core network entity CN.
  • the failure information further includes a duration of a state of the target base station displayed by the target base station state information;
  • the source switching network element is specifically configured to not initiate a handover to the target cell during the duration of the state.
  • the status of the target base station displayed by the target base station status information is: a training working status.
  • the source switching network element receives the failure information, determines that the failure information includes the target base station status information, and suspends the request handover.
  • the source switching network element learns that the reason for the handover failure is caused by the state of the target base station, so that the correct processing is performed for the failure reason, that is, the request switching is suspended, thus avoiding the repeated generation of the invalid handover, and reducing the source switching network. The number of invalid switches initiated by the element, thereby improving network performance.
  • 1 is a schematic structural diagram of a structure of an existing home base station access network
  • FIG. 2 is a schematic structural diagram of a structure of an existing home (evolved) base station access network
  • FIG. 3 is a flowchart of a method for implementing handover according to the present invention.
  • FIG. 4 is a schematic structural diagram of a system for implementing handover according to the present invention.
  • FIG. 5 is a schematic flowchart diagram of a first embodiment of a method for implementing handover according to the present invention
  • FIG. 6 is a schematic flowchart diagram of a second embodiment of a method for implementing handover according to the present invention.
  • FIG. 7 is a schematic flowchart diagram of a third embodiment of a method for implementing handover according to the present invention.
  • FIG. 8 is a schematic flowchart diagram of a fourth embodiment of a method for implementing handover according to the present invention. detailed description
  • FIG. 3 is a flowchart of a method for implementing handover according to the present invention. As shown in FIG. 3, the method includes the following steps: Step 300: When the handover fails, the target handover NE notifies the source handover NE of the failure information. The step further includes: the target switching network element notifying the core network element of the failure information, and the core network element notifying the source switching network element of the obtained failure information.
  • the failure information may be carried in the handover failure response message, and the handover failure response message may be: a handover failure message, or a handover preparation failure message, or a relocation failure message, or a relocation preparation failure message.
  • the failure information received by the source switching NE may be directly notified to the source switching NE by the core network element.
  • Step 301 The source switching network element determines that the failure information includes the target base station status information, and suspends the request to switch.
  • the target base station state information includes a state of the target base station that causes the handover to fail, such as a training working state. Further, the target base station state information further includes a time duration of the state.
  • the training working state refers to: When the base station is in the training working state, all users can access, even the CSG cell allows all users to access.
  • the source switching network element when the source switching network element fails to obtain the handover failure due to the state of the target base station, the source switching network element does not initiate a handover request to the target cell within a preset duration; or, if the target base station status information is The state duration of the state of the target base station displayed by the target base station state information is included, and then the source switching network element does not initiate handover to the target cell for the duration of the state.
  • the system of the present invention further provides a system for implementing handover, as shown in FIG. 4, which includes at least a source switching network element and a target switching network element, where
  • the target switching network element is configured to notify the source switching network element of the failure information to the source switching network element when the handover fails.
  • the target handover network element includes: a target base station, or a target home base station, or a target wireless network controller (RNC), or a target home base station gateway.
  • RNC target wireless network controller
  • the source switching network element is configured to determine that the failure information includes the target base station status information, and suspend the request handover.
  • the source switching network element includes: a source base station, or a source home base station, or a source RNC.
  • the failure information received by the source switching network element may also be directly from the core network element.
  • the system of the present invention further includes a core network element.
  • the target switching network element is further configured to notify the core network element of the failure information.
  • the core network element is configured to notify the source switching network element of the obtained failure information.
  • the core network element is a mobility management entity (MME).
  • MME mobility management entity
  • UMTS Universal Mobile Telecommunications System
  • the core network element is a core network entity (CN).
  • the target switching network element When the source switching network element is H(e)NB, and the target switching network element is H(e)NB, between the source switching network element and the target switching network element, or between the source switching network element and the core network element, or The core network element and the target switching network element further include an H(e)NB GW. At this time, the H(e)NB GW transparently transmits the received message.
  • the method of the present invention will be described in detail below with reference to the embodiments.
  • the method of the present invention is not only adapted to a home base station, but is also adapted to the case where the target is a CSG cell.
  • FIG. 5 is a schematic flowchart of a first embodiment of a method for implementing handover according to the present invention.
  • an LTE system is used as an example
  • a target handover network element is a target HeNB
  • a source switching network element is a source.
  • the HeNB, the target HeNB and the source HeNB are connected through a direct interface.
  • the method includes the following steps:
  • Step 500 The source HeNB determines that a handover procedure needs to be initiated to the target HeNB according to the measurement report result of the terminal, and sends a handover request message to the target HeNB through the direct interface.
  • Step 501 After receiving the handover request message, the target HeNB sends a handover preparation failure message to the source HeNB if the state of the target cell is in the TRAINNING state, and carries the failure information in the handover preparation failure message to the state that the target HeNB is in the TRAINNING state. Information, and the state duration of the target HeNB in the TRAINNING state;
  • the source HeNB After receiving the handover preparation failure message, the source HeNB acquires the state information of the target HeNB in the TRAINNING state, and the source HeNB does not switch to the target cell for the duration of the state in which the target HeNB is in the TRAINNING state.
  • the direct interface may be a direct interface between a macro eNB and a home base station, or a direct interface between the home base stations.
  • the direct interface may be a direct interface between the Macro RNC and the home base station, or may be a direct interface between the home base stations.
  • the process of implementing the handover of the present invention in the UMTS is similar to that in the LTE system described in the first embodiment. It is easy for those skilled in the art to implement the process shown in FIG. 5, and details are not described herein again.
  • RASAP Radio Network Subsystem Application Part
  • HNBAP Home Base Station Application Part
  • FIG. 6 is a schematic flowchart of a second embodiment of a method for implementing handover according to the present invention.
  • the second embodiment is a handover of a target HNB and a source HNB belonging to the same home base station gateway, referred to as Intra-GW handover, as shown in FIG. Includes the following steps:
  • Step 600 The source HNB determines, according to the measurement report result of the terminal, that a relocation is required to be sent to the target HNB, and sends a relocation request message to the HNB GW, where the relocation request message passes through the radio access network application part (RANAP, Radio Access Network Application Part) ) User Adaptation (RUA, RANAP User Adaption) message encapsulation.
  • RANAP Radio Access Network Application Part
  • UOA User Adaptation
  • Step 601 After receiving the relocation request message of the RUA encapsulation, the HNB GW determines that the target HNB and the source HNB belong to the same HNB GW, and sends a relocation request message of the RUA encapsulation to the target HNB.
  • Step 602 After receiving the relocation request message, the target HNB returns a relocation failure message to the HNB GW if it is in the TRAINNING state, and carries the failure information in the relocation failure message, the target cell is in the TRAINNING state, and the state continues. time.
  • Step 603 After receiving the relocation failure message, the HNB GW returns a relocation preparation failure message to the source HNB. After receiving the relocation preparation failure message, the source HNB acquires the status information of the target cell as a TRAINNING state, and continues in the state. No relocation occurs to the target cell during the time. If the state duration information is not carried in the relocation preparation failure message, the source HNB may not relocate to the target cell within a preset period of time.
  • step 601 after the HNB GW receives the relocation request message encapsulated by the RUA, if the HNB GW saves the state information of the target HNB, and the target HNB is in the TRAINNING state, the HNB GW directly returns to the source HNB GW.
  • the relocation preparation failure message carries the failure information in the relocation preparation failure message, and the target cell is in the TRAINNING state, and the duration of the state.
  • the message used in Figure 6 can use RUA messages, and can also use HNBAP, RANAP messages.
  • the processing procedure is the same as that shown in FIG. 6 , where the relocation request message corresponds to the handover request message and the relocation failure message in the HeNB.
  • the handover failure message, the relocation preparation message corresponds to the handover preparation failure message, and the specific implementation is easily implemented by those skilled in the art on the basis of FIG. 6, and details are not described herein again.
  • FIG. 7 is a schematic flowchart of a third embodiment of a method for implementing handover according to the present invention.
  • the LTE system is used as an example, and the HeNB is connected to the MME through the HeNB GW. It also includes the case where the HeNB is directly connected to the MME.
  • the method includes the following steps: Step 700: The source HeNB determines that a handover needs to be performed to the target cell according to the measurement report of the terminal, and sends a handover request message to the MME.
  • the handover request message is first sent to the home base station gateway (referred to as source HeNB GW in FIG. 7 ), and the source HeNB GW transparently transmits the received handover request message to the MME. MME.
  • Step 701 After receiving the handover request message, the MME performs access control on the terminal according to the CSG information of the target cell, and sends a handover request message to the target HeNB when the access is successful.
  • the MME first sends a handover request message to the target HeNB GW, and the target HeNB GW transmits the handover request message to the target.
  • Target HeNB the target HeNB
  • Step 702 After receiving the handover request message, the target HeNB returns a handover failure message to the MME if the target HeNB is in the TRAIN ING state, and carries the failure information in the handover failure message, the target cell is in the TRAINNING state, and the state duration.
  • the target HeNB when the target HeNB is connected to the MME through the target HeNB GW, the target HeNB first sends a handover request message to the target HeNB GW, and the target HeNB GW transmits the handover request message header to the MME.
  • the target HeNB GW saves the state information of the target cell
  • the target HeNB GW may also directly generate a handover failure message to the MME after receiving the handover request message, where the original information of the failure is carried.
  • the target cell is in the TRAINNING state, and the state duration, so that the target HeNB GW does not need to send the handover request message to the target HeNB.
  • Step 703 After receiving the handover failure message, the MME sends a handover preparation failure message to the source HeNB, and carries the failure information in the handover preparation failure message, the target cell is in the TRAINNING state, and the duration of the state.
  • the MME If the source HeNB is connected to the MME through the source HeNB GW, the MME first sends a handover preparation failure message to the source HeNB GW, and the source HeNB GW then prepares the handover preparation failure message. Transparent transmission to the source HeNB.
  • Step 704 After the source HeNB receives the handover preparation failure message, if the failure information indicates that the state of the target cell is the TRAIN ING state, the target base station state is recorded, and the handover is not initiated to the target cell during the state duration.
  • the information about the duration of the switch in the handover preparation failure message is taken as an example. If there is no state duration information, in this step, the source HeNB does not go to the target cell for a preset period of time. Initiate a switch.
  • step 701 after the MME receives the handover request message, if the MME stores the state information of the target cell, the MME directly returns a handover preparation failure message to the source HeNB, and carries the message in the message.
  • the failure information is that the target cell is in the TRANNING state, and the target cell is in the state duration of the state.
  • how the MME obtains the status information of the target cell does not belong to the protection scope of the present invention, and the method may be that the base station notifies the MME of the status information, or may be requested by the target base station, and then saved.
  • the specific implementation method is not intended to limit the scope of the present invention.
  • FIG. 8 is a schematic flowchart of a method for implementing a handover according to a fourth embodiment of the present invention.
  • the UMTS system is connected to the CN through the HNB GW.
  • the method includes:
  • Step 800 The source HNB/RNC determines that a handover needs to be performed to the target cell according to the measurement report of the terminal.
  • the source HNB sends a relocation request message to the CN.
  • the source HNB/RNC If the source HNB/RNC is connected to the CN through the HNB GW (represented as the source HNB GW in FIG. 8), the source HNB/RNC first sends a relocation request message to the source HNB GW, and the source HNB GW will again receive the handover request. The message was transparently transmitted to the CN.
  • Step 801 After receiving the relocation request message, the CN performs access control on the terminal according to the CSG information of the target cell, and sends a relocation request message to the target HNB/RNC when the access is successful.
  • the CN If the target HNB/RNC is connected to the CN through the HNB GW (referred to as the target HNB GW in FIG. 8), the CN first sends a relocation request message to the target HNB GW, the target HNB. The GW then transparently transmits the received relocation request message to the target HNB/RNC. At this time, if the target HNB GW saves the status information of the target HNB, when the target HNB is in the TRAINNING state, the target HNB GW may directly generate a relocation failure message, where the carrying failure information is that the target cell is in the TRAINNING state, and the status duration is , and send a relocation failure message to the CN. In this way, the target HNB GW does not need to send the received relocation request message to the target HNB.
  • Step 802 After receiving the relocation request message, the target HNB/RNC returns a relocation failure message to the target HNB GW if the target HNB/RNC is in the TRAINNING state, and carries the failure information in the message that the target cell is in the TRAINNING state. And the duration of this state.
  • the target HNB/RNC is connected to the CN through the target HNB GW, and the target HNB GW transparently transmits and receives the message.
  • Step 803 After receiving the relocation failure message, the CN sends a relocation preparation failure message to the source RNC, where the failure information carried in the relocation preparation failure message is that the target cell is in the TRAINNING state, and the duration of the state.
  • the step is: The CN first sends a handover preparation failure message to the source HNB GW, and the source HNB GW then transparently transmits the received handover preparation failure message to the source HNB.
  • Step 804 After receiving the relocation preparation failure message, if the status of the target cell is TRAINNING, the source HNB/RNC records the target cell status, and does not initiate relocation to the target cell within the duration of the status.
  • the information about the duration of the switch is carried in the handover preparation failure message. If there is no state duration information, the source HNB/RNC is no longer in the pre-configured duration. The target cell initiates a handover.
  • step 801 after the CN receives the relocation request message, if the CN saves the state information of the target cell, the CN may directly return a relocation preparation failure message to the source HNB, where the bearer failure information is the target cell.
  • the TRAINNING state In the TRAINNING state, and the duration of the state.

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Abstract

本发明提供了一种实现切换的方法及系统，在源切换网元接收到失败信息，确定失败信息包含有目标基站状态信息，暂停请求切换。通过本发明方法，源切换网元获知了切换失败原因为目标基站的状态引起，从而针对该失败原因进行正确的处理即暂停请求切换，这样，避免了无效切换的重复产生，减少了源切换网元发起的无效切换的次数，从而提高了网络性能。

Description

一种实现切换的方法及系统 技术领域
本发明涉及家庭基站技术， 尤指一种实现切换的方法及系统。 背景技术
随着无线通信技术的发展， 无线通信系统中引入了家庭基站的概念。 家庭基站是一种小型、 低功率的基站， 部署在家庭及办公室等室内场所， 主要作用是为了给用户提供更高的业务速率并降低使用高速率服务所需要 的费用， 同时， 弥补已有分布式蜂窝无线通信系统覆盖的不足。 家庭基站 的优点是实惠、 便捷、 低功率输出、 即插即用等。
如图 1、图 2所示，家庭基站用户是通过家庭 (演进)基站接入网（H(e)NB AN, Home (e)NodeB Access Network, 本文中简称为家庭基站接入网）连 接到核心网网络的， 其中， H(e)NB AN由家庭 (演进)基站（ H(e)NB, Home (e)NodeB , 本文中简称为家庭基站）和家庭 (演进)基站网关 （ H(e)NB GW , Home (e)NodeB Gateway, 本文中简称为家庭基站网关）共同组成。 对于演 进的家庭基站（ HeNB )系统， HeNB可以不通过 HeNB GW,而直接与 MME 连接。
其中， H(e)NB GW的主要功能包括： 处理家庭基站的注册和接入控制， 对家庭基站进行验证， 负责交换核心网和家庭基站的数据。 家庭 (演进)基站 管理系统（H(e)MS , 本文中简称为家庭基站管理系统） ， 对家庭基站进行 运行维护管理， 根据运营商要求配置和控制家庭基站， 最主要为 H(e)NB实 现配置管理功能， 其中包括位置信息的核实、 为 H(e)NB进行参数配置， 主 要涉及到核心网级别的参数配置、 无线接入网侧的参数配置以及射频（RF ) 的参数配置等。 随着家庭基站技术的发展， 为了实现对用户进行分组管理， 引入了封 闭用户组（CSG, Closed Subscriber Group ) 的概念， 并且用接入模式来描 述小区。 其中小区的接入模式分为三种： 封闭 （Closed )接入模式、 混合 ( Hybrid )接入模式和开放（Open )接入模式， 这三种接入模式用于描述 具有 CSG属性的小区。 对于 Closed接入模式的小区， 也称为 CSG小区， 对于 CSG小区，只有与该小区的 CSG签约的用户才能够接入，对于没有签 约的用户不能接入该 CSG小区；对于 Hybrid接入模式的小区，也称为 Hybrid 小区， 对于 Hybrid小区， 除了与小区的 CSG签约的用户可以接入， 没有签 以及在计费上也有所不同； 对于 Open模式的小区， 任何用户都可以接入， 在接入控制上和正常宏 （Macro ) 小区相同。
引入了家庭基站的概念后， 增加了小区间干扰的情况， 对干扰的处理 带来了新的挑战。 比如： 对于 UE无法接入的 CSG小区， UE均可视其为干 扰小区。 另外， 由于家庭基站数目众多， 且其具有即插即用的特性， 家庭 基站的工作地点很可能处于宏基站的覆盖区域， 这样， 是无法从网络规划 的角度预知家庭基站与宏基站之间的干扰的， 从而无法通过参数的预配置 来避免干扰。
通过统计 Non-CSG终端对 CSG小区的接入失败情况以及 Non-CSG终 端向 CSG小区切换的失败情况，可以初步判断 CSG小区对周围小区的造成 干扰的情况， 从而通过控制 CSG小区的功率做到一定程度的干扰控制。 其 中， Non-CSG终端是不具有 CSG属性的终端， 也就是说， Non-CSG终端 无法识别 CSG小区， 同时无法进行对 CSG小区的初始接入判断。但是，对 于没有 Non-CSG终端存在的情况， 由于 CSG终端可以初始判断是否可以 接入 CSG小区， 对于无法接入的情况， 不会发起初始接入或者切换， 从而 在这种情况下 CSG小区无法通过上述向 CSG小区切换的失败情况来发现干 扰的存在。 对于 CSG小区对 Macro小区存在干扰的情况， 目前，可釆用的方法为： Macro小区收集终端的测量上报， 判断是否有 CSG小区对其造成了干扰， 从而将测量结果传递到 CSG小区，由 CSG小区计算判断并且做出对干扰的 相应处理。 但是， 这样存在网络侧传递的消息数目过多的问题。 为了避免 网络侧测量消息过多的问题， 现有技术中还提出了一种新的家庭基站 （包 括任何 CSG小区 )的状态，在这种新的状态下， 家庭基站允许所有终端（包 括签约和非签约终端）接入， 但是不为终端提供服务， 利用终端接入的这 段时间中终端的测量上报信息， 家庭基站可以检测出对附近邻区的干扰情 况， 并通过调整家庭基站自身的发射功率以及频率做到干扰的预防， 称这 种新的状态为训练工作 （TRAINNING )状态。 由于 Hybrid接入模式以及 Open接入模式的小区允许所有的终端接入， 因此不会造成大的干扰， 本文 中只考虑 CSG小区。
在新增 TRAINNING状态下引入上述解决干扰的方法后， 会对现有标 准有一定的影响： 处在 TRAINNING状态下的家庭基站在空口进行正常的 广播， 从终端来看， 就是将一个 CSG小区变成了一个 Hybrid小区来对待， 该 CSG小区允许所有终端的接入。 在这种情况下， 处在 Macro小区的终端 (包括家庭基站小区）仍然会对该小区进行测量以及测量上报， 不可避免 地会发起向该家庭基站小区的切换。 此时， 在源小区处于连接态的终端大 多是有业务的， 在发生切换到该家庭基站时， 家庭基站无法提供相应的服 务， 从而造成了切换的失败。 也就是说， 现有技术中， 仅仅根据终端的测 量进行切换判断， 源基站可能会向处于 TRAINNING状态的家庭基站发起 无效的切换。 发明内容
有鉴于此， 本发明的主要目的在于提供一种实现切换的方法及系统， 能够避免无效切换的重复产生， 减少源切换网元发起的无效切换的次数， 从而提高网络性能。
为达到上述目的， 本发明的技术方案是这样实现的：
一种实现切换的方法， 在切换失败时， 包括：
源切换网元接收到失败信息， 确定失败信息包含有目标基站状态信息， 暂停请求切换。
该方法之前还包括： 目标切换网元将失败信息通知给所述源切换网元。 所述目标切换网元将失败信息通知给所述源切换网元包括：
所述目标切换网元将失败信息通知给核心网网元， 核心网网元将获得 的失败信息通知给所述源切换网元。
所述源切换网元接收到失败信息包括： 核心网网元直接将失败信息通 知给所述源切换网元。
所述失败信息携带在切换失败响应消息中；
所述切换失败响应消息为： 切换失败消息、 或切换准备失败消息、 或 重定位失败消息、 或重定位准备失败消息。
所述源切换网元暂停请求切换包括：
所述源切换网元在预先设置的时长内， 不再向目标小区发起切换； 所述失败信息中还包括所述目标基站状态信息显示的目标基站的状态 的持续时间；
所述源切换网元暂停请求切换包括： 所述源切换网元在该状态持续时 间内不再向目标小区发起切换。
所述目标基站状态信息显示的目标基站的状态为： 训练工作状态。 所述源切换网元为源基站、或源家庭基站、或源无线网络控制器 RNC; 所述目标切换网元为目标基站、 或目标家庭基站、 或目标 RNC、 或目 标家庭基站网关。
在长期演进 LTE系统中， 所述核心网网元为移动管理实体 MME; 在通用移动通信系统 UMTS中， 所述核心网网元为核心网实体 CN。 一种实现切换的系统， 至少包括源切换网元， 用于接收失败信息， 确 定失败信息包含有目标基站状态信息， 暂停请求切换。
该系统还包括目标切换网元， 用于在切换失败时， 将失败信息通知给 源切换网元。
该系统还包括核心网网元， 此时， 所述目标切换网元， 还用于将失败 信息通知核心网网元；
核心网网元， 用于将获得的失败信息通知给源切换网元。
该系统还包括核心网网元， 用于直接将失败信息通知给所述源切换网 元。
所述源切换网元为源基站、或源家庭基站、或源无线网络控制器 RNC; 所述目标切换网元为目标基站、 或目标家庭基站、 或目标 RNC、 或目 标家庭基站网关。
在长期演进 LTE系统中， 所述核心网网元为移动管理实体 MME; 在通用移动通信系统 UMTS中， 所述核心网网元为核心网实体 CN。 所述失败信息中还包括所述目标基站状态信息显示的目标基站的状态 的持续时间；
所述源切换网元， 具体用于在该状态持续时间内不再向目标小区发起 切换。
所述目标基站状态信息显示的目标基站的状态为： 训练工作状态。 从上述本发明提供的技术方案可以看出， 在源切换网元接收到失败信 息， 确定失败信息包含有目标基站状态信息， 暂停请求切换。 通过本发明 方法， 源切换网元获知了切换失败原因为目标基站的状态引起， 从而针对 该失败原因进行正确的处理即暂停请求切换， 这样， 避免了无效切换的重 复产生， 减少了源切换网元发起的无效切换的次数， 从而提高了网络性能。 附图说明
图 1为现有家庭基站接入网的组成结构示意图；
图 2为现有家庭 (演进)基站接入网的组成结构示意图；
图 3为本发明实现切换的方法的流程图；
图 4为本发明实现切换的系统的组成结构示意图；
图 5为本发明实现切换的方法的第一实施例的流程示意图；
图 6为本发明实现切换的方法的第二实施例的流程示意图；
图 7为本发明实现切换的方法的第三实施例的流程示意图；
图 8为本发明实现切换的方法的第四实施例的流程示意图。 具体实施方式
图 3为本发明实现切换的方法的流程图， 如图 3所示， 包括以下步骤： 步骤 300: 切换失败时， 目标切换网元将失败信息通知给源切换网元。 本步骤中还进一步包括： 目标切换网元将失败信息通知给核心网网元， 核心网网元再将获得的失败信息通知给源切换网元。
失败信息可以携带在切换失败响应消息中， 切换失败响应消息可以是： 切换失败消息、 或切换准备失败消息、 或重定位失败消息、 或重定位准备 失败消息等。
需要说明的是， 本步骤中， 源切换网元收到的失败信息也可以是核心 网网元直接通知给源切换网元的。
步骤 301 : 源切换网元确定失败信息包含有目标基站状态信息， 暂停请 求切换。
其中， 目标基站状态信息包括引起切换失败的目标基站的状态， 比如 训练工作状态； 进一步地， 目标基站状态信息还包括该状态持续的时间。 这里， 训练工作状态是指： 在基站处于训练工作状态下， 所有用户都能够 接入， 即使是 CSG小区也允许所有用户接入。 本步骤中， 源切换网元在获得由于目标基站的状态而引起的切换失败 时， 源切换网元在预先设置的时长内， 不再向目标小区发起切换请求； 或者， 如果目标基站状态信息中包括有目标基站状态信息所显示的目 标基站的状态的状态持续时间， 那么， 源切换网元在该状态持续时间内不 再向目标小区发起切换。
针对本发明方法还提供一种实现切换的系统， 如图 4所示， 至少包括 源切换网元和目标切换网元， 其中，
目标切换网元， 用于在切换失败时， 目标切换网元将失败信息通知给 源切换网元。 目标切换网元包括： 目标基站、 或目标家庭基站、 或目标无 线网络控制器（RNC ) 、 或目标家庭基站网关。
源切换网元， 用于确定失败信息包含有目标基站状态信息， 暂停请求 切换。 源切换网元包括： 源基站、 或源家庭基站、 或源 RNC。
另外， 源切换网元接收到的失败信息也可以是直接来自核心网网元的。 本发明系统还包括核心网网元， 此时， 目标切换网元， 还用于将失败 信息通知核心网网元；
核心网网元， 用于将获得的失败信息通知给源切换网元。 在 LTE系统 中， 核心网网元为移动管理实体（MME ) , 在通用移动通信系统（UMTS ) 中， 核心网网元为核心网实体（CN ) 。
在源切换网元为 H(e)NB, 目标切换网元为 H(e)NB时， 源切换网元与 目标切换网元之间， 或源切换网元与核心网网元之间， 或核心网网元与目 标切换网元之间， 还进一步包括 H(e)NB GW。 此时， H(e)NB GW对接收到 的消息进行透传。
下面结合实施例对本发明方法进行详细描述。 本发明方法不仅适应于 家庭基站， 而且适应于目标为 CSG小区的情况。
图 5 为本发明实现切换的方法的第一实施例的流程示意图， 第一实施 例中， 以 LTE 系统为例， 目标切换网元为目标 HeNB , 源切换网元为源 HeNB, 目标 HeNB与源 HeNB间通过直接接口连接， 如图 5所示， 包括以 下步骤：
步骤 500: 源 HeNB根据终端的测量上报结果， 判断需要向目标 HeNB 发起切换过程， 通过直接接口向目标 HeNB发送切换请求消息。
步骤 501 : 目标 HeNB收到切换请求消息后，如果目标小区的状态处于 TRAINNING状态，则向源 HeNB发送切换准备失败消息，并且在该切换准 备失败消息中携带失败信息为目标 HeNB处于 TRAINNING状态的状态信 息 , 以及目标 HeNB处于 TRAINNING状态的状态持续时间；
源 HeNB 收到切换准备失败消息后， 获取目标 HeNB 的状态信息为 TRAINNING状态， 源 HeNB在目标 HeNB处于 TRAINNING状态的状态 持续时间内不向目标小区发生切换。
本实施例中， 直接接口可以是宏基站（ Macro eNB )到家庭基站的直接 接口，也可以是家庭基站之间的直接接口。对于 UMTS下的家庭基站系统， 该直接接口可以是 Macro RNC到家庭基站之间的直接接口， 也可以是家庭 基站之间的直接接口。
UMTS中实现本发明切换的流程与第一实施例所述的 LTE系统中的类 似， 对于本领域技术人员来讲， 在图 5 所示流程的基础上实现是容易的， 这里不再赘述。 UMTS 中， 在消息使用上， 可以使用无线网络子系统应用 部分（ RASAP ) 消息， 也可以使用家庭基站应用部分（ HNBAP ) 消息。
图 6为本发明实现切换的方法的第二实施例的流程示意图， 第二实施 例为目标 HNB与源 HNB属于同一家庭基站网关下的切换，简称为 Intra-GW 切换， 如图 6所示， 包括以下步骤：
步骤 600: 源 HNB根据终端的测量上报结果， 判断需要向目标 HNB 发起重定位， 向 HNB GW发送重定位要求消息， 该重定位要求消息通过无 线接入网络应用部分 ( RANAP, Radio Access Network Application Part )用 户适配（RUA, RANAP User Adaption ) 消息封装。 步骤 601 : HNB GW收到 RUA封装的重定位要求消息后， 判断出目标 HNB和源 HNB属于同一 HNB GW, 向目标 HNB发送 RUA封装的重定位 请求消息。
步骤 602 : 目标 HNB 收到重定位请求消息后， 如果自身处于 TRAINNING状态， 则向 HNB GW返回重定位失败消息， 在该重定位失败 消息中携带失败信息为目标小区处于 TRAINNING状态， 以及该状态持续 时间。
步骤 603： HNB GW在收到重定位失败消息后 , 向源 HNB返回重定位 准备失败消息； 源 HNB在收到重定位准备失败消息后， 获取目标小区的状 态信息为 TRAINNING状态， 在该状态持续时间内不向目标小区发生重定 位。 如果在重定位准备失败消息中未携带状态持续时间信息， 则源 HNB可 以在自身预先设置的一段时间内， 不向目标小区发生重定位。
需要说明的是，在步骤 601中， HNB GW收到 RUA封装的重定位要求 消息后， 如果 HNB GW保存有目标 HNB的状态信息， 且目标 HNB处于 TRAINNING状态时， HNB GW直接向源 HNB GW返回重定位准备失败消 息， 并在该重定位准备失败消息中携带失败信息为目标小区处于 TRAINNING 态， 以及该^ 态持续时间。
图 6中使用的消息可以釆用 RUA消息， 也可以釆用 HNBAP、 RANAP 消息。
对于 LTE系统， 当源家庭基站和目标家庭基站属于相同的家庭基站网 关时， 其处理流程与图 6所示的相同， 其中的重定位请求消息对应 HeNB 中的切换请求消息、 重定位失败消息对应切换失败消息， 重定位准备消息 对应切换准备失败消息， 具体实现， 在图 6基础上， 对于本领域技术人员 来讲是容易实现的， 这里不再赘述。
图 7为本发明实现切换的方法的第三实施例的流程示意图， 第三实施 例中， 以 LTE系统为例， 包含 HeNB通过 HeNB GW与 MME相连的情况， 也包含 HeNB与 MME直接相连的情况。 如图 7所示， 包括以下步骤： 步骤 700: 源 HeNB根据终端的测量上报，判断出需要向目标小区发生 切换， 向 MME发送切换要求消息。
本步骤中， 如果源 HeNB通过 HeNB GW与 MME相连， 则首先将切 换要求消息发送给家庭基站网关（图 7中称为源 HeNB GW ) ,源 HeNB GW 再将收到的切换要求消息透传到 MME。
步骤 701： MME收到切换要求消息后，根据目标小区的 CSG信息对终 端做接入控制， 并在接入成功时， 向目标 HeNB发送切换请求消息。
本步骤中，如果目标 HeNB通过 HeNB GW(图 7中称为目标 HeNB GW ) 与 MME相连， 那么， MME先将切换请求消息发送到目标 HeNB GW, 目 标 HeNB GW再将该切换请求消息透传到目标 HeNB。
步骤 702: 目标 HeNB 收到切换请求消息后， 如果目标 HeNB 处在 TRAIN ING状态， 向 MME返回切换失败消息， 在该切换失败消息中携带 失败信息为目标小区处于 TRAINNING状态， 以及该状态持续时间。
本步骤中， 当目标 HeNB通过目标 HeNB GW与 MME相连时， 目标 HeNB先将切换请求消息发送给目标 HeNB GW, 目标 HeNB GW再将该切 换请求消息头传到 MME。 此时， 如果目标 HeNB GW保存有目标小区的状 态信息， 在目标小区处于 TRAINNING状态时， 目标 HeNB GW也可以在 收到切换请求消息后， 直接生成切换失败消息发送到 MME, 其中携带失败 原信息目标小区处于 TRAINNING状态， 以及该状态持续时间， 这样， 目 标 HeNB GW就不需要将再将该切换请求消息发送给目标 HeNB。
步骤 703: MME在收到切换失败消息后， 向源 HeNB发送切换准备失 败消息， 并在该切换准备失败消息中携带失败信息为目标小区处于 TRAINNING 态， 以及该^ 态持续时间。
如果源 HeNB通过源 HeNB GW与 MME相连， 那么， MME先将切换 准备失败消息发送到源 HeNB GW,源 HeNB GW再将该切换准备失败消息 透传到源 HeNB。
步骤 704: 源 HeNB收到切换准备失败消息后，如果失败信息显示目标 小区的状态为 TRAIN ING状态， 则记录目标基站状态， 在该状态持续时 间内不再向目标小区发起切换。
本实施例中， 是以切换准备失败消息中携带有转台持续时间信息为例 进行描述的， 如果没有状态持续时间信息， 那么， 本步骤中， 源 HeNB在 预先配置的时长内不再向目标小区发起切换。
需要说明的是， 在步骤 701中， 在 MME在收到切换要求消息后， 如果 MME中保存有目标小区的状态信息， 那么， MME直接向源 HeNB返回切 换准备失败消息， 并在该消息中携带失败信息为目标小区处于 TRANNING 状态， 以及目标小区处于该状态的状态持续时间。 这里， MME如何获得目 标小区的状态信息不属于本发明的保护范围， 其釆用的方法可以是基站将 其状态信息通知到 MME的，也可以是通过向目标基站请求并获得后保存的 等， 具体实现方法并不用于限定本发明的保护范围。
图 8为本发明实现切换的方法的第四实施例的流程示意图， 第四实施 例中， 以 UMTS系统为例， HNB/RNC通过 HNB GW与 CN相连， 如图 8 所示， 包括：
步骤 800: 源 HNB/RNC根据终端的测量上报， 判断出需要向目标小区 发生切换。 源 HNB向 CN发送重定位要求消息。
如果源 HNB/RNC通过 HNB GW (图 8中表示为源 HNB GW )与 CN 相连，那么，源 HNB/RNC先将重定位要求消息发送给源 HNB GW,源 HNB GW再将收到的切换要求消息透传到 CN。
步骤 801 : CN收到重定位要求消息后，根据目标小区的 CSG信息对终 端做接入控制， 在接入成功时， 向目标 HNB/RNC发送重定位请求消息。
如果目标 HNB/RNC通过 HNB GW (图 8中称为目标 HNB GW )与 CN相连， 那么， CN先将重定位请求消息发送到目标 HNB GW, 目标 HNB GW再将收到的重定位请求消息透传到目标 HNB/RNC。 此时， 如果目标 HNB GW保存有目标 HNB的状态信息， 在目标 HNB处于 TRAINNING状 态时， 目标 HNB GW可以直接生成重定位失败消息， 其中携带失败信息是 目标小区处于 TRAINNING状态， 以及该状态持续时间， 并将重定位失败 消息发送给 CN。 这样， 目标 HNB GW就不需要将再将收到重定位请求消 息发送给目标 HNB。
步骤 802:目标 HNB/RNC收到重定位请求消息后 ,如果目标 HNB/RNC 处在 TRAINNING状态， 则向目标 HNB GW返回重定位失败消息， 在该消 息中携带失败信息为目标小区处于 TRAINNING状态， 以及该状态持续时 间。 这里， 以目标 HNB/RNC与 CN间通过目标 HNB GW相连， 目标 HNB GW对收发的消息进行透传。
步骤 803 : CN收到重定位失败消息后， 向源 RNC发送重定位准备失 败消息， 在该重定位准备失败消息中携带的失败信息为目标小区处于 TRAINNING 态， 以及该^ 态持续时间。
对于源 HNB,本步骤为： CN先向源 HNB GW发送切换准备失败消息， 源 HNB GW再将收到的切换准备失败消息透传到源 HNB。
步骤 804: 源 HNB/RNC收到重定位准备失败消息后， 如果目标小区的 状态为 TRAINNING状态， 那么， 记录目标小区状态， 并且在该状态持续 时间内不再向目标小区发起重定位。
本实施例中， 是以切换准备失败消息中携带有转台持续时间信息为例 进行描述的， 如果没有状态持续时间信息， 那么， 本步骤中， 源 HNB/RNC 在预先配置的时长内不再向目标小区发起切换。
需要说明的是， 在步骤 801中， 在 CN接收到重定位要求消息后， 如果 CN保存有目标小区的状态信息， CN可以直接向源 HNB返回重定位准备失 败消息， 其中携带失败信息是目标小区处于 TRAINNING状态， 以及该状 态持续时间。 以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围， 凡在本发明的精神和原则之内所作的任何修改、 等同替换和改进 等， 均应包含在本发明的保护范围之内。

Claims

权利要求书
1、 一种实现切换的方法， 其特征在于， 在切换失败时， 包括： 源切换网元接收到失败信息， 确定失败信息包含有目标基站状态信息， 暂停请求切换。
2、 根据权利要求 1所述的方法， 其特征在于， 该方法之前还包括： 目 标切换网元将失败信息通知给所述源切换网元。
3、 根据权利要求 2所述的方法， 其特征在于， 所述目标切换网元将失 败信息通知给所述源切换网元包括：
所述目标切换网元将失败信息通知给核心网网元， 核心网网元将获得 的失败信息通知给所述源切换网元。
4、 根据权利要求 1所述的方法， 其特征在于， 所述源切换网元接收到 失败信息包括： 核心网网元直接将失败信息通知给所述源切换网元。
5、 根据权利要求 1~4任一项所述的方法， 其特征在于， 所述失败信息 携带在切换失败响应消息中；
所述切换失败响应消息为： 切换失败消息、 或切换准备失败消息、 或 重定位失败消息、 或重定位准备失败消息。
6、 根据权利要求 1~4任一项所述的方法， 其特征在于， 所述源切换网 元暂停请求切换包括：
所述源切换网元在预先设置的时长内， 不再向目标小区发起切换；
7、 根据权利要求 1~4任一项所述的方法， 其特征在于， 所述失败信息 中还包括所述目标基站状态信息显示的目标基站的状态的持续时间；
所述源切换网元暂停请求切换包括： 所述源切换网元在该状态持续时 间内不再向目标小区发起切换。
8、 根据权利要求 1~4任一项所述的方法， 其特征在于， 所述目标基站 状态信息显示的目标基站的状态为： 训练工作状态。
9、 根据权利要求 1所述的方法， 其特征在于， 所述源切换网元为源基 站、 或源家庭基站、 或源无线网络控制器 RNC;
所述目标切换网元为目标基站、 或目标家庭基站、 或目标 RNC、 或目 标家庭基站网关。
10、 根据权利要求 3或 4所述的方法， 其特征在于， 在长期演进 LTE 系统中， 所述核心网网元为移动管理实体 MME;
在通用移动通信系统 UMTS中， 所述核心网网元为核心网实体 CN。
11、 一种实现切换的系统， 其特征在于， 至少包括源切换网元， 用于 接收失败信息， 确定失败信息包含有目标基站状态信息， 暂停请求切换。
12、 根据权利要求 11所述的系统， 其特征在于， 该系统还包括目标切 换网元， 用于在切换失败时， 将失败信息通知给源切换网元。
13、 根据权利要求 12所述的系统， 其特征在于， 该系统还包括核心网 网元， 此时， 所述目标切换网元， 还用于将失败信息通知核心网网元； 核心网网元， 用于将获得的失败信息通知给源切换网元。
14、 根据权利要求 11所述的系统， 其特征在于， 该系统还包括核心网 网元， 用于直接将失败信息通知给所述源切换网元。
15、 根据权利要求 12或 14所述的系统， 其特征在于， 所述源切换网 元为源基站、 或源家庭基站、 或源无线网络控制器 RNC;
所述目标切换网元为目标基站、 或目标家庭基站、 或目标 RNC、 或目 标家庭基站网关。
16、根据权利要求 13或 14所述的系统，其特征在于，在长期演进 LTE 系统中， 所述核心网网元为移动管理实体 MME;
在通用移动通信系统 UMTS中， 所述核心网网元为核心网实体 CN。
17、 根据权利要求 11~14任一项所述的系统， 其特征在于， 所述失败 信息中还包括所述目标基站状态信息显示的目标基站的状态的持续时间； 所述源切换网元， 具体用于在该状态持续时间内不再向目标小区发起 切换。
18、 根据权利要求 17所述的系统， 其特征在于， 所述目标基站状态信 息显示的目标基站的状态为： 训练工作状态。
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