WO2008025222A1 - Procédé pour traiter des erreurs de nœud de support de passerelle de domaine de paquets - Google Patents

Procédé pour traiter des erreurs de nœud de support de passerelle de domaine de paquets Download PDF

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Publication number
WO2008025222A1
WO2008025222A1 PCT/CN2007/002409 CN2007002409W WO2008025222A1 WO 2008025222 A1 WO2008025222 A1 WO 2008025222A1 CN 2007002409 W CN2007002409 W CN 2007002409W WO 2008025222 A1 WO2008025222 A1 WO 2008025222A1
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Prior art keywords
support node
gprs support
sgsn
serving gprs
message
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PCT/CN2007/002409
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English (en)
French (fr)
Inventor
Jinguo Zhu
Jiannan Cai
Xiliang Liu
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Zte Corporation
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Application filed by Zte Corporation filed Critical Zte Corporation
Priority to US12/377,811 priority Critical patent/US8116272B2/en
Priority to EP07785314A priority patent/EP2058987B1/en
Publication of WO2008025222A1 publication Critical patent/WO2008025222A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/32—Release of transport tunnels

Definitions

  • the present invention relates to a packet domain of a third generation mobile communication system, and in particular to a method for error handling when an abnormality occurs on a user plane of a gateway GPRS support node in a single tunnel scheme.
  • GPRS General Packet Radio Service
  • ETSI European Telecommunication Standards Institute
  • UMTS PS Universal Mobile Telecommunication System Packet Switch
  • Figure 1 The network architecture includes the following network elements:
  • NodeB Provides an air interface connection for the terminal.
  • Radio Network Controller mainly manages radio resources and controls the NodeB.
  • the NodeB and the RNC are called the Radio Network System (RNS).
  • the RNC and the NodeB are connected through the lub port, and the terminal is connected through the RNS.
  • Packet Core packet core network
  • the Service GPRS Support Node Serving GPRS Support Node Saves the user's routing area location information, responsible for security and access control.
  • the SGSN is connected to the RNS through the Iu port.
  • the Iu port includes an Iu-C port and an Iu-U port;
  • Gateway GPRS Support Node It is responsible for allocating the IP address of the terminal and the gateway function to the external network. It is connected to the SGSN through the Gn-C port and the Gn-U port.
  • HLR Home Location Register Home Location Register
  • Packet Data Network Provides a packet-based service network for users and connects to the GGSN through the Gi port.
  • the data transmitted in Figure 1 is divided into two types, user plane data and signaling plane data.
  • User face Responsible for transmitting user service data
  • the signaling plane is mainly responsible for managing user planes, including the establishment, release, and modification of user planes.
  • the user plane path from the user equipment/terminal User Equipment (UE) to the PDN in the UMTS PS system passes through at least three network elements: RNS 4, SGSN 2, and GGSN 3.
  • RNS 4 User Equipment
  • SGSN 2 Serving GPRS Tunneling Protocol
  • GTP GPRS Tunneling Protocol
  • the organization is studying to separate the SGSN from the user plane path.
  • the user plane contains only one tunnel: from the R S directly to the GTP-U tunnel of the GGSN. This scheme is called a single tunnel scheme.
  • the single tunnel scheme is shown in Figure 2.
  • a dual tunneling scheme is still required, such as a user roaming but needs to access the home GGSN, a lawful interception of the user plane in the SGSN, a user having an intelligent service, and a case where the GGSN does not support a single tunnel. Whether it is a single tunnel or a dual tunnel is determined by the SGSN.
  • the gateway support node GGSN when the gateway support node GGSN receives the SGSN uplink user plane data packet, if the GGSN determines that the user plane is abnormal, the GGSN discards the data packet and returns a user plane error indication message (Error Indication). Give the SGSN. After the SGSN receives it, the process is as shown in Figure 3, including the following steps:
  • the SGSN 2 sends an uplink data packet to the GGSN 3 according to the saved GGSN address and the tunnel number.
  • the GGSN 3 After receiving the data packet, the GGSN 3 finds that the corresponding user plane context cannot be found, and then returns a user plane message error indication message (Error Indication) to the SGSN 2;
  • Error Indication a user plane message error indication message
  • the UE After receiving the SGSN 2, the UE deactivates the PDP context procedure.
  • the SGSN When the SGSN receives the RC uplink user plane data packet, if the SGSN determines that the user plane is abnormal, the SGSN discards the data packet and returns a user plane error indication message to the RNC. After receiving the RNC, the radio access bearer Radio Access Bearer (RAB) will be released locally.
  • RNC Radio Access Bearer
  • the RNC 4 sends an uplink data packet to the SGSN 2 according to the saved SGSN address and the tunnel number;
  • the SGSN 2 After receiving the data packet, the SGSN 2 finds that the corresponding user plane context cannot be found, and then returns an error indication (Error Indication) to the RNC.
  • Error Indication an error indication
  • the RNC In the single tunnel scheme, no modifications are made to the RNC and GGSN. Therefore, after the single tunnel is established, if the RNC receives an error indication from the GGSN, the RNC still considers the error indication to come from the SGSN, and then directly releases the AB. In this way, although the RNC has detected that the PDP context does not exist in the GGSN, the SGSN and the UE cannot be notified of the release of the PDP context in time, and the user will not receive the downlink data for a long time, which brings a bad service experience to the user.
  • the present invention provides a method of transmitting a notification message to the SGSN after R C detects a GGSN anomaly. After receiving the SGSN, the UE initiates a deactivation PDP context procedure. This ensures that the PDP context states of the UE, SGSN, and GGSN are consistent.
  • the object of the present invention is to provide a method for processing a packet domain gateway supporting node error, which is to use the method after the RNC receives the error indication message of the GGSN.
  • the PDP contexts in the UE and the SGSN can be avoided, so that the PDP contexts of the UE, the SGSN, and the GGSN are consistent.
  • the present invention provides a packet domain gateway supporting node error processing method, including the following steps:
  • the radio network controller sends a notification message to the serving GPRS support node gateway according to the error indication message;
  • the service GPRS support node judges that in the case of a single tunnel, the serving GPRS support node initiates a deactivation packet data protocol context procedure according to the received notification message to the user equipment, deletes the user equipment and the service GPRS support node packet data protocol context, and maintains They are consistent with the Gateway GPRS Support Node Packet Data Protocol context state.
  • the notification message is a radio access bearer release request message, and the cause value of the message indicates that the radio network controller receives an error indication.
  • the serving GPRS support node knows whether the bearer is a single tunnel bearer according to the saved bearer attribute.
  • the serving GPRS support node determines whether the notification message is a gateway GPRS support node failure; if yes, initiates a deactivation of the packet data protocol context to the user equipment. process. Further, the step 1.2) specifically includes the serving GPRS support node initiating a deactivation packet data protocol context request to the user equipment and the user equipment returning a deactivated packet data protocol context response to the serving GPRS support node.
  • the processing method provided by the present invention sends a notification message to the SGSN after the RNC receives the error indication message of the GGSN, and the SGSN determines that the bearer is a single tunnel bearer, and then, according to the notification message, knows that the GGSN is abnormal, sends the message to the UE.
  • the PDP context process is activated, so that the PDP contexts in the SGSN and the UE are blocked for a long time, and the PDP context states of the UE, the SGS, and the GGSN are consistent.
  • Figure 2 is a system architecture diagram of a single tunnel scheme of UMTS/GPRS
  • FIG. 3 is a process of receiving a GGSN error indication message by the SGSN in the case of a dual tunnel
  • FIG. 4 is a process of receiving an SGSN error indication message by the RC in the case of a dual tunnel
  • FIG. 5 is a RC detection in the single tunnel solution provided by the present invention.
  • the GGSN has an abnormal error detection mechanism.
  • the present invention provides a method for receiving an error indication Error Indication of a GGSN at an RNC. Then, a notification message is sent to the SGSN to notify the SGSN that the GGSN user plane has an abnormality. The SGSN initiates a deactivation of the PDP context procedure so that both the UE and the SGSN's PDP context can be successfully released. Further, the notification message has an error reason, indicating that the GGSN user plane is abnormal.
  • the RNC After the RNC receives the error indication Error Indication, the RNC needs to determine whether the error indication message is from the SGSN or from the GGSN.
  • One solution currently exists is to include a flag in the RAB assignment request indicating whether a single tunnel is enabled. If a single tunnel is enabled, the RNC determines that the error indication message is from the GGSN, otherwise the error indicates that the message is from the SGSN. In another implementation manner, the RNC does not judge that the error indication message is from the SGSN or the GGSN, and the R C initiates the notification message to the SGSN as long as the error indication message is received.
  • the RNC determines that the error indication comes from the GGSN and needs to notify the SGSN.
  • One embodiment is to notify the SGSN using a RAB Release Request message. And add a new cause of error to the reason value carried.
  • the reason is the reason for the non-access stratum, the cause value is, for example, 85, and the cause value indicates that the RNC receives the error indication message.
  • the implementation, as shown in FIG. 5, includes the following steps:
  • the RNC 4 stores the stored GGSN address and tunnel number, and sends an uplink packet to the GGSN 3.
  • GGSN 3 After receiving the data packet, GGSN 3 finds that the corresponding user plane context cannot be found, and then returns to the RNC 4 user plane message error indication (Error Indication ⁇
  • the RNC 4 After receiving the error indication, the RNC 4 judges that the single tunnel is enabled, and thus knows that the error indication is from the GGSN 3. A RAB release request is then initiated to the SGSN 2 with a cause value in the request: The RNC 4 receives an error indication message. The RNC 4 can also directly initiate an RAB release request without determining that a single tunnel is enabled, with a cause value in the request: The RNC receives an error indication message.
  • the PDP context of the UE and the SGSN is also deleted.
  • the UE may then re-initiate the Activate PDP Context Request message to reconstruct the PDP context.
  • the RNC can notify the SGSN that the GGSN is abnormal according to the method of the present invention.
  • the SGSN can send a deactivated PDP context procedure to the UE according to the received message, thereby ensuring that the PDP context states of the UE, the SGSN, and the GGSN are consistent.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Description

一种分组域网关支持节点错误的处理方法
技术领域
本发明涉及第三代移动通信系统分组域，具体涉及一种单隧道方案中网 关 GPRS支持节点用户面发生异常时候的错误处理方法。
背景技术
通用分组无线业务 General Packet Radio Service (简称 GPRS)是一个基于 包交换的第二代移动通信网络， 相关标准是由欧洲通信标准化委员会 European Telecommunication Standards Institute (简称 ETSI)来制定的。到了第 三代移动通信系统， GPRS 演进为通用移动通信系统分组交换 Universal Mobile Telecommunication System Packet Switch (筒称 UMTS PS)域。 UMTS PS的网络架构如图 1所示。 该网络架构中包含如下网元：
NodeB: 为终端提供空口连接。
无线网络控制器 Radio Network Controller (简称 RNC): 主要管理无线资 源以及控制 NodeB, NodeB 和 RNC 总共叫无线网络系统 Radio Network System (简称 RNS), RNC与 NodeB之间通过 lub口连接， 终端通过 RNS接 入 UMTS的分组核心网（Packet Core)。
服务 GPRS支持节点 Serving GPRS Support Node (简称 SGSN): 保存用 户的路由区位置信息， 负责安全和接入控制。 SGSN通过 Iu口和 RNS相连。 Iu口包括 Iu-C口、 Iu-U口；
网关 GPRS支持节点 Gateway GPRS Support Node (简称 GGSN):负责分 配终端的 IP地址和到外部网络的网关功能， 在内部通过 Gn-C口、 Gn-U口 和 SGSN相连。
归属位置寄存器 Home Location Register (筒称 HLR):保存用户的签约数 据和当前所在的 SGSN地址。
分组数据网络 Packet Data Network (简称 PDN): 为用户提供基于分组的 业务网， 通过 Gi口与 GGSN相连。
在图 1中传输的数据分为两种， 用户面数据和信令面数据。 用户面主要 负责传输用户业务数据，而信令面主要负责管理用户面，包括用户面的建立、 释放、 修改等。 在 UMTS PS系统中从用户设备 /终端 User Equipment (简称 UE)到 PDN的用户面路径至少经过 3个网元： RNS 4、 SGSN 2和 GGSN 3。 对应有两个隧道： RNS到 SGSN的隧道和 SGSN到 GGSN的隧道， 因此被称 为双隧道方案。 这两个隧道都是基于 GPRS 隧道协议 GPRS Tunneling Protocol (简称 GTP)协议， 该隧道也被称为 GTP-U隧道。
随着 IP多媒体子系统 IP Multimedia Subsystem (筒称 IMS)业务的逐步开 展以及其他多媒体业务的推广， 业务对传输层的延迟和性能要求越来越高。 组织正在研究将 SGSN从用户面路径中剥离开来， 作为单独的信令面网元， 用户面只包含一个隧道： 从 R S直接到 GGSN的 GTP-U隧道。 该方案被称 为单隧道方案。 单隧道方案如图 2所示。
单隧道方案对于两个隧道方案来说， 由于在用户面少了一个节点， 因此 数据的延迟比较小， 更加有利于传输多媒体业务。 但是在某些时候， 仍然需 要双隧道方案， 比如用户漫游但是需要接入到归属的 GGSN、 需要在 SGSN 合法监听用户面、 用户具有智能业务以及 GGSN不支持单隧道的情况。 具 体是采用单隧道还是双隧道是由 SGSN来判断的。
在目前的双隧道方案中， 当网关支持节点 GGSN收到 SGSN上行行用 户面数据包的时候， 如果 GGSN判断用户面出现异常， 则丢弃该数据包， 并返回用户面错误指示消息 (Error Indication)给 SGSN。 SGSN收到之后， 将 过程如图 3所示， 包括以下步驟：
301 ) SGSN 2根据保存的 GGSN地址和隧道号，向该 GGSN 3发送上行 数据包；
302 ) GGSN 3 收到数据包之后， 发现找不到相应的用户面上下文， 于 是返回给 SGSN 2一个用户面消息错误指示消息 (Error Indication);
303 ) SGSN 2收到之后， 向 UE 1发起去激活 PDP上下文过程。
当 SGSN收到 R C上行用户面数据包的时候， 如果 SGSN判断用户面 出现异常， 则丟弃该数据包， 并返回用户面错误指示消息给 RNC。 RNC收 到之后， 将本地释放无线接入承载 Radio Access Bearer (简称 RAB)。 该过程 如图 4所示， 包括以下步骤：
401 ) RNC 4根据保存的 SGSN地址和隧道号， 向该 SGSN 2发送上行 数据包；
402 ) SGSN 2收到数据包之后， 发现找不到相应的用户面上下文， 于是 返回给 RNC—个用户面消息错误指示 (Error Indication);
403 ) RNC 4收到之后， 将本地释放 AB。
在单隧道方案中， 对 RNC和 GGSN不做任何修改。 因此当单隧道建立 之后， 如果 RNC收到 GGSN的错误指示之后， RNC还是认为该错误指示来 自于 SGSN,于是直接释放 AB。这样虽然 RNC已经检测到 GGSN中该 PDP 上下文已经不存在，但是无法及时通知 SGSN和 UE释放该 PDP上下文，用 户将长时间无法收到下行数据， 给用户带来不好的业务体验。
本发明提供了一种方法， 在 R C检测到 GGSN异常之后， 向 SGSN发 起通知消息。 SGSN收到之后， 向 UE发起去激活 PDP上下文过程。 这样就 保证了 UE、 SGSN和 GGSN的 PDP上下文状态一致。 发明内容 针对现有技术存在的缺陷和不足， 本发明的目的是： 提供一种分组域网 关支持节点错误的处理方法,其目的在于， 当 RNC收到 GGSN的错误指示消 息之后， 利用该方法， 可以避免 UE和 SGSN中的 PDP上下文被挂住， 从而 保证 UE、 SGSN和 GGSN的 PDP上下文状态一致。 为达到上述目的，本发明提供的一种分组域网关支持节点错误的处理方 法， 包括以下步骤：
1.1)无线网络控制器根据错误指示消息向服务 GPRS支持节点网关发送 通知消息；
1.2)服务 GPRS支持节点判断是在单隧道情况下，则服务 GPRS支持节 点根据接收的通知消息向用户设备发起去激活分组数据协议上下文过程，删 除用户设备和服务 GPRS 支持节点分组数据协议上下文、 保持它们与网关 GPRS支持节点分组数据协议上下文状态一致。 进一步，所述步骤 1.1)中，所述通知消息是无线接入承载释放请求消息， 并且该消息所带的原因值表明无线网络控制器收到了错误指示。 进一步， 所述步骤 1.2)中， 服务 GPRS支持节点根据保存的承载属性知 道该承载是否是单隧道承载。 进一步， 所述步骤 1.2)中， 在单隧道承载情况下， 服务 GPRS支持节点 对所述通知消息进行判断， 是否是网关 GPRS支持节点失败； 如果是， 则向 用户设备发起去激活分组数据协议上下文过程。 进一步， 所述步骤 1.2)具体包括服务 GPRS支持节点向用户设备发起去 激活分组数据协议上下文请求和用户设备向服务 GPRS 支持节点返回去激 活分组数据协议上下文响应。 本发明提供的处理方法， 在 RNC收到 GGSN的错误指示消息之后， 向 SGSN发送通知消息， SGSN判断该承载是单隧道承载， 然后根据该通知消 息， 知道 GGSN发生了异常， 则向 UE发去激活 PDP上下文过程， 从而避 免了 SGSN和 UE中的 PDP上下文长时间被挂住，保证 UE、 SGS 和 GGSN 的 PDP上下文状态一致。 附图概述 以下结合附图和具体实施例对本发明作进一步详细说明。 图 1是 UMTS/GPRS的双隧道方案系统架构图；
图 2是 UMTS/GPRS的单隧道方案系统架构图；
图 3是双隧道情况下 SGSN收到 GGSN错误指示消息的处理过程； 图 4是双隧道情况下 R C收到 SGSN错误指示消息的处理过程； 图 5是本发明提供的单隧道方案中 R C检测到 GGSN出现异常的错误 检测机制。 本发明的较佳实施方式
本发明提供了一种方法，在 RNC收到 GGSN的错误指示 Error Indication 之后， 向 SGSN发起一个通知消息， 通知 SGSN所述的 GGSN用户面发生 了异常。 SGSN发起去激活 PDP上下文过程， 这样 UE和 SGSN的 PDP上 下文都可以被成功释放。 更进一步， 所述通知消息中带有错误原因， 指示 GGSN用户面出现异常。
为使得本发明的目的、技术方案和有点更加清楚， 下面将结合附图对本 发明作进一步地详细描述。
RNC在用户面收到错误指示 Error Indication之后，需要判断该错误指示 消息是来自 SGSN还是来自 GGSN。 目前存在的一种方案是在 RAB指配请 求中带上一个标记， 指示是否启用了单隧道。 如果启用了单隧道， 则 RNC 判断错误指示消息来自 GGSN, 否则该错误指示消息来自 SGSN。 另外一种 实施方式是 RNC不判断该错误指示消息来自 SGSN或者是 GGSN, 只要收 到错误指示消息， R C都向 SGSN发起通知消息。
RNC判断该错误指示来自于 GGSN之后， 需要通知 SGSN。 一个实施 例是使用 RAB释放请求消息来通知 SGSN。 并在所携带的原因值中新增一 个错误原因。该原因是非接入层的原因，原因值比如 85,该原因值表示 RNC 收到错误指示消息。 该实施例如图 5所示， 包括以下步骤：
501 ) RNC 4 居保存的 GGSN地址和隧道号， 向该 GGSN 3发送上行 数据包。
502 ) GGSN 3 收到数据包之后， 发现找不到相应的用户面上下文， 于 是返回给 RNC 4—个用户面消息错误指示 (Error Indication^
503 ) RNC 4收到错误指示之后， 判断启用了单隧道， 于是知道该错误 指示来自 GGSN 3。 于是向 SGSN 2发起一个 RAB释放请求， 该请求中带有 原因值： RNC 4收到错误指示消息。 RNC 4也可以不用判断启用了单隧道而 直接发起 RAB释放请求， 该请求中带有原因值： RNC收到错误指示消息。
504 ) SGSN 2收到之后，根据保存的承载属性判断该承载启用了单隧道 方案， 而且 RNC 4指示的原因是 RNC收到错误指示消息， 于是知道 GGSN 中上下文已经失败了， 则直接向 UE 1发起去激活 PDP上下文过程。 通过该 过程， RNC 4和 SGSN 2之间的 RAB被释放掉。 505 ) UE 1向 SGSN 2发送去激活 PDP上下文响应。
通过去激活 PDP上下文过程， UE和 SGSN的 PDP上下文也被删除了。 之后 UE可能重新发起激活 PDP上下文请求消息来重建 PDP上下文。
综上所述， 采用本发明的方法， RNC可以通知 SGSN GGSN发生了异 常， SGSN根据收到的消息， 可以向 UE发去激活 PDP上下文过程， 从而保 证 UE、 SGSN和 GGSN的 PDP上下文状态一致。
本领域的技术人员在不脱离权利要求书确定的本发明的精神和范围的 条件下，还可以对以上内容进行各种各样的修改。 因此本发明的范围并不仅 限于以上的说明， 而是由权利要求书的范围来确定的。

Claims

权 利 要 求 书
1、 一种分组域网关支持节点错误的处理方法， 其特征在于， 包括以下 步驟：
1.1)无线网络控制器 (4)根据错误指示消息向服务 GPRS支持节点 (2)发送 通知消息；
1.2)在单隧道情况下， 服务 GPRS 支持节点 (2)根据接收的通知消息向 用户设备 (1)发起去激活分组数据协议上下文过程， 保持用户设备 (1)和服务 GPRS支持节点 (2)与网关 GPRS支持节点 (3)分组数据协议上下文状态一致。
2、 如权利要求 1所述处理方法， 其特征在于， 所述步骤 1.1)中， 所述 通知消息是无线接入承载释放请求消息，并且该消息所带的原因值表明无线 网络控制器 (4)收到了错误指示。
3、 如权利要求 1所述处理方法， 起特征在于， 所述步驟 1.2)中， 服务 GPRS支持节点根据保存的承载属性知道该承载是否是单隧道承载。
4、 如权利要求 1所述处理方法， 起特征在于， 所述步骤 1.2)中， 在单 隧道承载情况下，服务 GPRS支持节点 (2)对所述通知消息进行判断，是否是 无线网络控制器 (4)收到了错误指示； 如果是， 则向用户设备 (1)发起去激活 分组数据协议上下文过程。
5、 如权利要求 1所述处理方法， 其特征在于， 所述步骤 1.2)具体包括 服务 GPRS支持节点 (2)向用户设备 (1)发起去激活分组数据协议上下文请求 和用户设备 (1)向服务 GPRS 支持节点 (2)返回去激活分组数据协议上下文响 应。
PCT/CN2007/002409 2006-08-21 2007-08-10 Procédé pour traiter des erreurs de nœud de support de passerelle de domaine de paquets WO2008025222A1 (fr)

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EP2058987A4 (en) 2011-09-14
US20100046362A1 (en) 2010-02-25
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