WO2007112684A1 - Procédé et système et appareil de commutation indépendant de supports pour la détection et la signalisation d'environnement de réseau sans fil dans le transfert de réseau - Google Patents

Procédé et système et appareil de commutation indépendant de supports pour la détection et la signalisation d'environnement de réseau sans fil dans le transfert de réseau Download PDF

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Publication number
WO2007112684A1
WO2007112684A1 PCT/CN2007/001042 CN2007001042W WO2007112684A1 WO 2007112684 A1 WO2007112684 A1 WO 2007112684A1 CN 2007001042 W CN2007001042 W CN 2007001042W WO 2007112684 A1 WO2007112684 A1 WO 2007112684A1
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Prior art keywords
network
mihf
terminal side
terminal
upper layer
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PCT/CN2007/001042
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English (en)
French (fr)
Inventor
Yuan Liu
Hui Zhong
Shu Wang
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Huawei Technologies Co. Ltd.
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Application filed by Huawei Technologies Co. Ltd. filed Critical Huawei Technologies Co. Ltd.
Priority to EP07720616A priority Critical patent/EP2003918A4/en
Publication of WO2007112684A1 publication Critical patent/WO2007112684A1/zh
Priority to US12/206,267 priority patent/US8125957B2/en

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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
    • H04W36/005—Control or signalling for completing the hand-off involving radio access media independent information, e.g. MIH [Media independent Hand-off]
    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation

Definitions

  • the present invention relates to the field of media independent handover (MM), and in particular, to a method, system and device for detecting and reporting a terminal-side wireless network environment during media independent handover.
  • MM media independent handover
  • 802.11-defined WLANs 802.16 protocol-defined wireless metropolitan area networks
  • 3GPP 3rd Generation Mobile Communications Standardization Partnership Project
  • 802.21 is proposed to solve the above problems.
  • the IEEE (Independent Institute of Electrical and Electronics Engineers) 802.21 (Media Independent Switching Service) protocol is a standard that provides auxiliary switching functions for upper layers in heterogeneous networks to optimize the network switching process. . It is used to meet the requirements of hardware and software switching between different media and the corresponding mechanism to achieve switching. The goal is to finally enable the client device to automatically select the best network connection type and access when roaming between networks. Point and enable seamless switching without user intervention, enhancing the user experience of mobile devices by supporting switching between heterogeneous networks.
  • network switching can be divided into two types, one initiated by the terminal side and initiated by the other network side.
  • the network side In the handover initiated by the network side, the network side must know the wireless network environment around the terminal, including the base stations existing around the terminal and the wireless parameters of the base stations perceived by the terminal. Only when this information is known, the network side can correctly select the target base station to be switched, otherwise the decision on the network side is inaccurate.
  • the system adopts the mode of terminal assisted handover, that is, the terminal performs the monitoring decision, and the MSC (Mobile Switching Center) controls the handover process, and both the base station and the terminal participate in the handover.
  • the terminal continuously detects the wireless environment parameters of the base station and the neighboring cell base station during the call, and periodically reports to the base station of the current cell; the base station base station determines according to the received report of the terminal. Whether a handoff should be made, when the handover condition is met, the base station issues a handoff request to the terminal.
  • the wireless environment detection and reporting on the terminal side is the basis for the network side to initiate the handover, and is very important for the network-side dominant handover.
  • the cross-cell handover of GSM is only between homogeneous networks and does not involve heterogeneous networks.
  • the 802.21 protocol can support the switching between the homogeneous and heterogeneous networks.
  • the network side needs to notify the terminal side to perform the detection of the wireless environment, and feed back the detection result to the network side as the basis for the selection of the handover target.
  • the terminal can support the detection and reporting of multiple network media type information.
  • the current method is as follows: The network side can send a scan request to the terminal, and the terminal side detects the surrounding network after receiving the request, and reports the scanned access point to the network side by responding, but the current standard about the terminal side wireless
  • the mechanism for environmental parameter detection and reporting is not perfect, mainly reflected in:
  • the information of the network neighbor is provided by the MIH information server, but the information is static information, such as the network type, address, carrier, etc. of the access point (POA). Dynamic content including POA signal strength and power cannot provide comprehensive and effective information for network-initiated handover.
  • the existing handover-related commands and events do not support the dynamic detection and reporting of the terminal-side wireless network environment parameters.
  • the primitives supporting link parameter detection in 802.21 include MIH-Link-Parameters-Report and (MIH Link Parameter Report) MIH-Get-Status (MIH Link State Acquisition Command); primitives supporting neighbor access point discovery. Includes MIH-Scan (MIH Scan Command) and MIH-Link_Detected (MIH Link Discovery).
  • the MIH_Link_Parameters-Report is an event, and the MIH-Get-Status is a command, but only the parameters of the link currently being used can be obtained, and the wireless parameter information of the access point of the unestablished link cannot be obtained through it;
  • the MIH-Scan command is initiated by the upper layer to scan the access points, but the information about these access points cannot be further obtained.
  • the MIH-Link-Detected event is a notification when a new PoA is discovered, including only The static information of the PoA is also unable to complete the related functions.
  • An object of the present invention is to provide a wireless network environment detection and reporting method, a system, and a media independent switching device in a network handover, to solve the problem that the mechanism for detecting and reporting the wireless environment parameters of the terminal side is imperfect in the prior art.
  • the present invention provides an embodiment of a method for detecting and reporting a wireless network environment in network switching, including the following steps:
  • the terminal side MIHF receives the network scanning indication, initiates a network scanning, and generates a wireless network environment parameter 4 surrounding the terminal, where the parameter report includes dynamic information and static information of the PoA around the terminal; b. the terminal side MIHF will perform the wireless The network environment parameter report is sent to the upper layer of the terminal side or the MIHFe of the network side.
  • the media independent switching device embodiment provided by the present invention includes a network scanning and processing module, configured for network scanning indication, initiating network scanning, and receiving network scanning information, and generating wireless information around the terminal including dynamic information and static information of the scanned POA.
  • the network environment parameter report sends the wireless network environment parameter report to the terminal side upper layer or the network side MIHF.
  • the embodiment of the invention provides a system for detecting and reporting a wireless network environment in a network handover, including a terminal side MIHF and a network side MIHF, where the terminal side MIHF is configured to receive a network scan indication, initiate a network scan, and generate a wireless surrounding the terminal.
  • the network environment parameter report includes the dynamic information and the static information of the PoA around the terminal, and sends the wireless network environment parameter report to the terminal side upper layer or the network side MIHF.
  • the present invention overcomes the deficiencies of the prior art, and uses the terminal side MIHF to scan the surrounding wireless network environment to obtain the dynamic information and static information of the scanned POA, and then report the event through the media independent scan response or through the registered media independent wireless network environment parameter.
  • the MIHF sent to the network side is used by the network side handover decision module to perform the handover decision, which solves the problem that the network side cannot initiate detection and report to the terminal side dynamic wireless network environment when the network side initiates the handover.
  • the technical solution of the invention simultaneously supports the homogeneous and heterogeneous network environment, improves the accuracy of selecting the target access point when the network side initiates the handover, and improves the network switching efficiency.
  • Figure 1 is a MIHF architecture diagram
  • 2 is a flow chart of Embodiment 1 of the method of the present invention
  • Embodiment 3 is a flow chart of Embodiment 2 of the method of the present invention.
  • the present invention provides an embodiment of a system capable of detecting and reporting a wireless network environment in a network handover, including a terminal side MIHF and a network side MIHF, and the MIHF on the terminal side initiates a network after receiving a network scan request or indication (MIH_Scan). After the scanning is completed, a report of the isomorphic or heterogeneous wireless network environment parameters surrounding the terminal is generated and sent to the MIHF of the network side or the upper layer of the terminal side. For the network side, the network side MIHF sends the wireless network environment parameter report to the upper layer of the network side. .
  • the handover decision module is sent to the network side or the upper layer of the terminal side, where the wireless network environment parameter report includes the dynamic information of the scanned PQA; the upper layer of the terminal side or the upper layer of the network side may be the terminal side or the terminal side MIHF.
  • the upper MIH—SAP and MIH user layers refer to Figure 1.
  • Figure 1 shows the architecture of MIHF.
  • the upper part of MIHF is the upper layer of MIHF, and the entity MIHLSAP of MIHF interface is the MIH service access point.
  • the parts below MIHF are media-related link layers, such as 802.11/802.16/3GPP, which interact with MIH-LINK-SAP and MIHF.
  • MIHF interacts with transport entities and network management entities through MIH_NET—SAP and MIH-NMS-SAP.
  • the network scan request or indication is from an upper layer on the network side or an upper layer on the terminal side.
  • the MIHF includes a network scanning and processing module, the network scanning and processing module, for network scanning indication, initiating Network scanning, and receiving network scan information, generating a wireless network environment parameter report around the terminal including dynamic information and static information of the scanned POA, and transmitting the wireless network environment parameter report to the terminal side upper layer or network side MIHFo
  • the network scanning and processing module sends the wireless network environment parameter report to the terminal side upper layer or the network side MIHF through the media independent scanning response or by the registered media independent wireless network environment parameter reporting event.
  • Embodiment 1 of the method of the present invention is as follows.
  • the MIHF on the terminal side After receiving the MIH-Scan request on the network side, the MIHF on the terminal side initiates a network scan. After the scan is completed, the MIHF generates a report of the isomorphic or heterogeneous wireless network environment parameters around the terminal and sends the report to the network side handover decision module.
  • the MIH-Scan sent by MIHF to the MIHF on the terminal side needs to be modified, as follows:
  • the original 802.21 MIH-Scan command request is defined as follows:
  • MIH_Scan.request (Sourceldentifier, Destinationldentifier,
  • the original MIH-Scan request parameters are defined as shown in the following table:
  • ScanResultSets (scan result set) is defined in the relevant protocol, but MIH-Scan is the upper layer to MIHF command, it should be media-independent, the specific information of the media protocol should be transparent to the upper layer, so the modified The new primitive is defined as follows:
  • MIH Scan.request (Sourceldentifier, Destinationldentifier, ScanRequestSets )
  • the modified MIH—Scan request parameters are defined as shown in the following table:
  • Source Identifier MIHF Identifier The identifier or group identifier of any legal independent originating requesting entity. This parameter can be empty if the command is local.
  • Destination Identifier MIHF Identifier MIH The destination ID of the LOCAL request or response
  • MIH— REMOTE which can be a local or peer MIH entity.
  • Scan Request Sets N/AN/A The changed primitives of the link list to be scanned are changed to ScanRequestSets.
  • ScanRequestSets is the list of links to be queried by the upper layer, including the type of link, such as 802.11, 802.16, 3GPP. And 3GPP2 and so on.
  • the MIH layer is responsible for initiating queries for obtaining access point information through a specific network protocol. The specific query process is transparent to the upper layer.
  • the original 802.21 MIH-Scan command response is defined as follows:
  • MIH Scan.response (Sourceldentifier, Destinationldentifier, Scan Response Sets)
  • the original MIH-Scan response parameters are defined as shown in the following table:
  • the revised new primitive is defined as follows:
  • the modified MIH-Scan response parameters are defined as shown in the following table:
  • Source Identifier MIHF Identifier The identifier of any legally independent or originating request entity. If the order is to Local, this parameter can be empty
  • MIHF identifier MIH The destination of the request or response for the LOCAL
  • MIH—REMOTE identifier which can be a local or peer MIH entity.
  • Scan Response Sets N/A Scan Response Set The response set includes the POA set detected by the terminal and related wireless environment parameter information.
  • the Scan Response Sets in the MIH-Scan response are only defined as the scanned POA set.
  • this parameter contains the static and dynamic wireless network environment of the scanned POA.
  • Information such as:
  • Static information of the POA such as network type, network identifier, POA address, and channel information.
  • Static information of the POA such as network type, network identifier, and carrier.
  • the handover decision module of the network side initiates the handover initialization: Since the network side obtains static information from the MIH capability discovery process or the MIH information server and is not comprehensive, the correct handover candidate POA cannot be selected for the terminal at this time;
  • the network side handover decision module sends the MIH_Scan request to its own MIHF, and the MIHF is sent to the MIHF of the terminal through the currently used link;
  • the MIHF on the terminal side can open the network interface of the powered-off network or wake up the interface in the dormant state to initiate a network scan. After the scan is completed, the MIHF generates a homogeneous or heterogeneous wireless network environment around the terminal. Report of parameters;
  • the terminal side MIHF sends the report to the network side MIHF through the MIH-Scan response via the current link, and the MIHF transmits it to the decision module, and the decision module extracts the report content for analysis. Switching decisions;
  • the above steps 2 to 4 can be repeatedly performed periodically, and the network side periodically detects the wireless network environment around the terminal.
  • the network side asynchronously acquires the report of the terminal wireless network environment by registering the MIH-Neighbor-Report event service on the terminal side.
  • the definition of the new primitive is as follows: Prototype: MIH_Neighbor— Report-indication
  • the MIH-Neighbor—Report primitive parameters are defined as shown in the following table:
  • the Neighborhood Reports in the primitives contain static and dynamic information about the POA scanned by the terminal.
  • the handover decision module on the network side initiates handover initialization. Since the network side obtains static information from the MIH capability discovery process or the MIH information server and is not comprehensive, the correct handover candidate POA cannot be selected for the terminal at this time; 2.
  • the network side handover decision module sends an MIH-Event_Register (MIH event registration) request to its own MIHF, and the MIHF sends the MIH-Neighbor-Report event registration to the terminal's MIHF through the currently used link, and carries the terminal for registration. Parameters such as the conditions of the network scan and the time interval reported to the network side.
  • MIH-Event_Register MIH event registration
  • the MIHF of the terminal side finds that the scanning condition is met, it performs periodic network scanning, and generates an obituary of the isomorphic or heterogeneous wireless network environment parameters around the terminal;
  • the terminal side MIHF sends the report to the network side MIHF through the MIH-Neighbor_Report event via the current link, and the MIHF transmits it to the decision module.
  • the decision module extracts the report content for analysis and is used to switch decisions. ⁇

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Description

无线网络环境检测和上报方法、 ***和媒体无关切换装置 本申请要求于 2006 年 4 月 3 日提交中国专利局、 申请号为 200610060160.0、 发明名称为 "一种网络切换中无线网络环境检测和上报的方 法"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
本发明涉及媒体无关切换（ MM, Media Independent Handover )技术领域， 具体来说， 涉及到媒体无关切换时终端侧无线网络环境的检测和上报的方法、 ***和设备。
背景技术
当前存在着许多不同架构的网络， 如 802.11定义的无线局域网、 802.16协 议定义的无线城域网、 3GPP (第三代移动通信标准化伙伴项目）定义的第三 代蜂窝移动通信网，对于应用来说很难在保证业务连续性的条件下方便地在异 构网络中进行切换和漫游。 802.21的提出正是为解决上述问题的， IEEE (美国 电子及电气工程师学会 )定义的 802.21(媒体无关切换服务)协议是一个在异构 网络中为上层提供辅助切换功能以优化网络切换过程的标准。它用于满足在不 同的媒体之间进行软硬件切换的要求以及实现切换的相应机制，其目标是最终 使客户端设备在网间漫游时能自动选择庸量最好的网络连接类型和接入点，而 且能在无须用户干预的情况下实现无缝切换，通过支持异构网络间的切换增强 移动设备的用户体验。
目前在 802.21 协议中， 网絡切换可以分为两种， 一种由终端侧发起， 另 一种网络侧发起。在由网络侧发起的切换中， 网络侧必须知道终端周围的无线 网絡环境，包括终端周围存在的基站以及终端感知到的这些基站的无线参数等 信息。 只有知道了这些信息， 网络侧才能正确地选择切换目标基站， 否则网络 侧的决策是不准确的。
例如在 GSM***中， ***采用了终端辅助切换的方式， 即由终端进行监 测判决， 由 MSC (移动交换中心）控制切换过程， 基站和终端均参与切换。 终端在通话过程中不断地检测本小区和相邻小区基站的无线环境参数，并周期 性地报告给当前小区的基站;本小区基站依据所接收到的该终端的报告来判断 是否应该进行越区切换， 当满足越区切换条件时，基站便向终端发出越区切换 请求。 由此可见， 终端侧的无线环境检测和报告是网絡侧发起切换的依据， 对 于网络侧主导的切换非常重要。 但 GSM的跨小区切换仅是同构网络之间的， 不涉及异构网络。
802.21协议能够支持同构及异构网络之间的切换， 在由网络侧发起的切 换中， 网络侧需要通知终端侧进行无线环境的检测， 并将检测结果反馈给网络 侧作为切换目标选择的依据。 在 802.21 中， 终端能够支持多种网絡媒体类型 信息的检测和上报。 目前采用的方法是： 网络侧可以发送扫描请求到终端， 终 端侧接到请求后检测周围的网络情况，并通过响应将扫描到的接入点上报给网 络侧，但目前标准中关于终端侧无线环境参数检测和报告的机制并不完善， 主 要体现在：
1、 目前 802.21 的网络邻居发现过程中， 网络邻居的信息是由 MIH信息 服务器提供的， 但这些信息都是静态信息， 如接入点（POA )的网络类型、 地 址、 运营商等内容， 不包括 POA信号强度、 功率等动态内容， 对于网络侧发 起的切换无法提供全面有效的信息。
2、 终端侧将自身的无线网络环境参数上报给网絡侧的流程不明确。 目前 802.21中在终端侧发起切换时，终端可以感知周围的无线网络环境并选择切换 候选 PoA但对于网络侧发起的切换， 这种方法不适用。 网络侧必须通过某种 途径得到终端周围的网络情况才能正确地为终端选择切换目标 POA, 而这个 问题在现有技术中尚未解决。
3、 现有切换相关的命令和事件不能很好地支持终端侧无线网絡环境参数 的动态检测和报告。 目前 802.21 中支持链路参数检测的原语包括 MIH— Link— Parameters— Report和（ MIH链路参数报告 ) MIH— Get—Status ( MIH 链路状态获取命令 )； 支持邻居接入点发现的原语包括 MIH—Scan ( MIH扫描 命 令 ） 和 MIH— Link_Detected ( MIH 链 路 发 现 ） 。 其 中 MIH— Link— Parameters— Report是事件， MIH— Get— Status为命令， 但都只能获取 当前正在使用的链路的参数，无法通过其得到未建立链路的接入点的无线参数 信息； MIH—Scan命令由上层发起， 用于扫描接入点， 但无法进一步得到这些 接入点的相关信息； MIH— Link— Detected事件是发现新 PoA时的通知， 仅包括 了 PoA的静态信息， 同样无法完成相关功能。
发明内容
本发明的目的在于提供一种网络切换中无线网络环境检测和上报方法、系 统和媒体无关切换装置，以解决现有技术中关于终端侧无线环境参数检测和报 告的机制不完善的问题。
为实现上述目的，本发明提供了一种网络切换中无线网络环境检测和上报 方法的实施例， 包括如下步驟：
a、 终端侧 MIHF接收网络扫描指示， 发起网络扫描， 生成终端周围无线 网络环境参数 4艮告， 所述参数报告包括终端周围 PoA的动态信息和静态信息； b、 终端侧 MIHF将所述的无线网络环境参数报告发送到终端侧上层或网 络侧 MIHFe
本发明提供的媒体无关切换装置实施例， 包括网络扫描和处理模块， 用于 网络扫描指示， 发起网络扫描， 以及接收网络扫描信息， 生成包括扫描到的 POA 的动态信息和静态信息的终端周围无线网络环境参数艮告， 将所述的无 线网络环境参数报告发送到终端侧上层或网络侧 MIHF。
本发明提供的能够实现网络切换中无线网络环境检测和上报的***实施 例， 包括终端侧 MIHF和网络侧 MIHF， 其中， 终端侧 MIHF, 用于接收网络扫描 指示， 发起网络扫描， 生成终端周围无线网络环境参数报告， 所述参数报告包 括终端周围 PoA的动态信息和静态信息， 以及，将所述的无线网络环境参数报 告发送到终端侧上层或网络侧 MIHF。
本发明克服现有技术的不足，采用终端侧 MIHF对周围的无线网络环境扫 描获取扫描到的 POA的动态信息和静态信息后通过媒体无关扫描响应或者通 过注册的媒体无关的无线网络环境参数上报事件发送到网络侧的 MIHF, 供网 络侧切换决策模块进行切换决策，解决了现有技术中网络侧发起切换时不能检 测和上报终端侧动态无线网络环境的问题。本发明技术方案同时支持同构和异 构网络环境，提高了网络侧发起切换时选择目标接入点的准确性， 改进了网络 切换效率。
附图说明
图 1为 MIHF架构图； 图 2为本发明所述方法的实施例一流程图；
图 3为本发明所述方法的实施例二流程图。
具体实施方式
本发明提供了一种能够实现网络切换中无线网络环境检测和上报的*** 实施例， 包括终端侧 MIHF和网络侧 MIHF， 终端侧的 MIHF接收到网络扫描 请求或指示 （MIH— Scan )后发起网络扫描， 扫描完成后生成终端周围同构或 异构无线网絡环境参数报告，发送给网络侧 MIHF或终端侧上层,对于网络侧 来说， 网络侧 MIHF将该无线网络环境参数报告发送到网络侧上层。例如发送 到网络侧或终端侧上层的切换决策模块，其中， 所述的无线网络环境参数报告 包括扫描到的 PQA的动态信息； 所述终端侧上层或网络侧上层可以为终端侧 或终端侧 MIHF上层的 MIH— SAP和 MIH用户层， 参考图 1。 图 1为 MIHF的 架构图， 其中 MIHF以上的部分为 MIHF的上层（Upper Layer) , 和 MIHF的接口 的实体 MIHLSAP为 MIH服务接入点。 MIHF以下的部分是媒体相关的链路层， 如 802. 11/802. 16/3GPP等， 其通过 MIH一 LINK-SAP和 MIHF交互。 此外 MIHF 还通过 MIH_NET— SAP及 MIH-NMS-SAP和传输实体以及网絡管理实体交互。所述 网络扫描请求或指示来自网络侧上层或终端侧上层。
在这个***实施例中， 有一个媒体无关切换装置， 即 MIHF, 被设置在所 述终端侧，该 MIHF包括包括网络扫描和处理模块， 所述网络扫描和处理模块， 用于网络扫描指示， 发起网絡扫描， 以及接收网络扫描信息， 生成包括扫描到 的 POA的动态信息和静态信息的终端周围无线网络环境参数报告， 将所述的 无线网络环境参数报告发送到终端侧上层或网络侧 MIHFo
其中，所述网络扫描和处理模块通过媒体无关扫描响应，或者通过所注册 的媒体无关的无线网络环境参数上报事件，将所述的无线网络环境参数报告发 送到终端侧上层或网络侧 MIHF。
本发明所述方法实施例一如下所述。
终端侧的 MIHF接收到网络侧的 MIH— Scan请求后发起网络扫描，扫描完 成后 MIHF 生成终端周围同构或异构无线网络环境参数的报告发送给网络侧 切换决策模块。
首先， 为实现终端侧 MIHF扫描时获取 POA的动态信息， 需要对网络侧 MIHF发送给终端侧的 MIHF的 MIH—Scan需要进行参数修改， 具体如下： 原有 802.21的 MIH— Scan命令请求定义如下：
原 型 ： MIH_Scan.request (Sourceldentifier, Destinationldentifier,
ScanResultSets)
原有 MIH— Scan请求参数定义如下表所示:
Figure imgf000007_0001
原有原语中 ScanResultSets (扫描结果集合）是在相关协议中定义的， 但 MIH— Scan是上层到 MIHF的命令， 应该是媒体无关的， 媒体协议的特定信息 对于上层应该透明， 因此修改后的新原语定义如下：
原 型 ： MIH— Scan.request (Sourceldentifier, Destinationldentifier, ScanRequestSets )
修改后 MIH— Scan请求参数定义如下表所示:
名称 ', ■ ½型 ： 范围 「' 描速：
Source Identifier MIHF标识符任何合法的独立发起请求的实体的标识 或组标识符 符。 如果命令是到本地 的， 该参数可为空。
Destination Identifier MIHF标识符 MIH— LOCAL 请求或响应的目的标识
MIH— REMOTE 符， 可以是本地或对端 的 MIH实体。 Scan Request Sets N/A N/A 上层要扫描的链路列表 改后的原语将 ScanResultSets改为 ScanRequestSets, ScanRequestSets为 上层要查询的链路的列表， 包含了链路的类型， 如 802.11， 802.16, 3GPP和 3GPP2等。 MIH层负责通过特定的网络协议去发起获取接入点信息的查询。 具体的查询过程对于上层来说是透明的。
原有 802.21的 MIH— Scan命令响应定义如下：
原型： MIH— Scan.response (Sourceldentifier, Destinationldentifier, Scan Response Sets)
原有 MIH— Scan响应参数定义如下表所示：
Figure imgf000008_0001
修改后的新原语定义如下：
原型： MIH Scan. confirm (Sourceldentifier, Destinationldentifier, Scan
Response Sets)
修改后 MIH— Scan响应参数定义如下表所示:
' 名称 类型 ' ,' '范围， , ' ：： 描述
Source Identifier MIHF标识符 任何合法的独立或发起请求的实体的标 组标识符 识符。 如果命令是到 本地的， 该参数可为 空
Destination Identifier MIHF标识符 MIH— LOCAL 请求或响应的目的标
MIH— REMOTE 识符， 可以是本地或 对端的 MIH实体。
Scan Response Sets N/A 扫描响应集合 响应集合包括了终端 检测到的 POA 集合 和相关的无线环境参 数信息。 在原有协议中， MIH— Scan响应中 Scan Response Sets (扫描响应集合）只 定义为扫描到的 POA集合， 在修改后的原语中， 该参数包含了扫描到的 POA 的静态和动态无线网络环境信息， 如：
POA的静态信息， 如网络类型、 网络标识、 POA地址和信道等信息 POA 的静态信息， 如网络类型、 网络标识和运营商等信息；
扫描时 POA的信号强度信息；
扫描时 POA的功率信息；
特定媒体的相关信息（可选） 。
网络侧主动发起的查询终端无线网络环境流程如附图 2所示：
1、 网络侧的切换决策模块发起切换初始化: 由于网络侧从 MIH能力发现 过程或 MIH信息服务器得到的是静态信息而且不全面， 因此此时无法为终端 选择正确的切换候选 POA;
2、 网络侧切换决策模块发送 MIH_Scan请求到自身的 MIHF, MIHF通过 当前使用的链路发送到终端的 MIHF;
3、 终端侧的 MIHF接收到 MIH— Scan请求后可以将已下电的网络设备接 口开启或将休眠状态的接口唤醒，发起网络扫描，扫描完成后 MIHF生成终端 周围同构或异构无线网络环境参数的报告；
4、 终端侧 MIHF经由当前链路将报告通过 MIH—Scan响应发送到网络侧 MIHF, MIHF再将其传送到决策模块， 决策模块提取报告内容进行分析， 用 于切换决策；
上述步骤 2 ~ 4可周期性重复执行， 用于网络侧周期性地检测终端周围的 无线网络环境。
本发明所述方法实施例二如下所述：
网络侧通过在终端侧注册 MIH— Neighbor— Report ( MIH无线网络环境参数 上报）事件服务来异步地获取终端无线网络环境的报告。新增原语的定义如下: 原型： MIH_Neighbor— Report-indication
MIH— Neighbor— Report原语参数定义如下表所示:
Figure imgf000010_0001
原语中 Neighborhood Reports和 MIH— Scan中的 Scan Response Sets一样, 包含了终端扫描到的 POA的静态和动态信息。
由网络侧注册，终端通过事件向网络侧报告自身无线网络环境的流程如附 图 3所示：
1、 网络侧的切换决策模块发起切换初始化。 由于网絡侧从 MIH能力发现 过程或 MIH信息服务器得到的是静态信息而且不全面， 因此此时无法为终端 选择正确的切换候选 POA; 2、 网络侧切换决策模块发送 MIH一 Event— Register ( MIH事件注册）请求 到自身的 MIHF , MIHF 通过当前使用的链路发送到终端的 MIHF 进行 MIH— Neighbor— Report事件注册， 注册时携带终端进行网络扫描的条件及向网 络侧报告的时间间隔等参数。
3、 当终端侧的 MIHF发现满足扫描条件时， 其进行周期性地网络扫描， 并生成终端周围同构或异构无线网络环境参数的 艮告；
4、 终端侧 MIHF经由当前链路将报告通过 MIH— Neighbor—Report事件发 送到网络侧 MIHF, MIHF再将其传送到决策模块。 决策模块提取报告内容进 行分析， 用于切换决策。 ―

Claims

权 利 要 求
1、 一种网络切换中无线网络环境检测和上报方法， 其特征在于， 所述的 方法包括如下步骤：
a、 终端侧 MIHF接收网络扫描指示， 发起网络扫描， 生成终端周围无线 网络环境参数报告， 所述参数报告包括终端周围 PoA的动态信息和静态信息； b、 终端侧 MIHF将所述的无线网络环境参数报告发送到终端侧上层或网 络侧 MIHFo
2、 根据权利要求 1所述的方法， 其特征在于， 网络侧 MIHF将从其上层 收到的媒体无关扫描命令发送到终端侧 MIHF或者，终端侧上层将媒体无关扫 描命令发送到终端侧 MIHF ,指示终端侧 MIHF发起网络扫描； 以及，
终端侧 MIHF通过媒体无关扫描响应将所述的无线网络环境参数报告发 送到终端侧上层或网络侧 MIHF。
3、根据权利要求 1所述的方法， 其特征在于， 网络侧 MIHF将从其上层收 到的媒体无关的无线网絡环境参数上报事件的注册请求发送到终端侧 MIHF， 或者终端侧上层发送媒体无关的无线网络环境参数上报事件的注册请求到终 端侧 MIHF, 终端侧 MIHF进行所述的上报事件的注册， 并根据所注册的媒体无 关的无线网络环境参数上报事件发起网络扫描； 以及，
终端侧 MIHF将所述的无线网络环境参数报告通过所注册的媒体无关的 无线网络环境参数上报事件发送到所述的终端侧上层或 网络侧 MIHF。
4、 根据权利要求 2所述的方法， 其特征在于， 所述媒体无关扫描命令中 携带要求终端侧 MIHF扫描的链路列表包含链路信息。
5、根据权利要求 2或者 3所述的方法，其特征在于还包括： 终端侧 MIHF 发起网络扫描时将已下电的网络设备接口开启或将休眠状态的接口唤醒。
6、根据权利要求 2或者 3所述的方法，其特征在于，所述的扫描到的 POA 的动态信息包括下面信息的一种或多种： POA的信号强度信息、 功率信息和 媒体相关的动态网络信息；所述的扫描到的静态信息包括下面信息的一种或多 种： 网络类型、 网络标识、 POA地址和信道。
7、 根据权利要求 3所述的方法， 其特征在于， 所述终端侧 MIHF进行媒 体无关的无线网络环境参数上报事件注册时携带终端进行网络扫描的条件和 / 或向网络侧报告的时间间隔参数。
8、 一种媒体无关切换装置， 包括网络扫描和处理模块， 其特征在于： 所述网络扫描和处理模块， 用于网络扫描指示， 发起网络扫描， 以及接收 网络扫描信息， 生成包括扫描到的 POA的动态信息和静态信息的终端周围无 线网络环境参数报告，将所述的无线网络环境参数报告发送到终端侧上层或网 络侧 MIHF。
9、 根据权利要求 8所述的方法， 其特征在于， 所述网络扫描指示来自终 端侧上层或网络侧上层。
10、一种能够实现网络切换中无线网絡环境检测和上报的***， 包括终端 侧 MIHF和网络侧 MIHF, 其特征在于： 终端侧 MIHF， 用于接收网络扫描指 示， 发起网絡扫描， 生成终端周围无线网络环境参数报告， 所述参数报告包括 终端周围 PoA的动态信息和静态信息， 以及，将所述的无线网络环境参数报告 发送到终端侧上层或网络侧 MIHF。
11、根据权利要求 10所述的方法， 其特征在于， 所述网络扫描指示来自 终端侧上层或网络侧上层。
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KR20060013058A (ko) * 2004-08-05 2006-02-09 에스케이텔레시스 주식회사 이동통신시스템에서 이동통신단말기의 핸드오버수행방법, 이동통신단말기, 이동통신시스템에서 기지국의핸드오버 수행방법, 이동통신시스템의 기지국 및이동통신시스템
CN1859750A (zh) * 2005-12-30 2006-11-08 华为技术有限公司 多模终端使用多链路时的切换方法
CN1881919A (zh) * 2006-02-18 2006-12-20 华为技术有限公司 一种异构网络间切换的方法

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EP2003918A1 (en) 2008-12-17
US20090036132A1 (en) 2009-02-05
CN100455128C (zh) 2009-01-21

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