CN1738285A - 错误指示报文处理方法 - Google Patents
错误指示报文处理方法 Download PDFInfo
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- CN1738285A CN1738285A CNA2004100537802A CN200410053780A CN1738285A CN 1738285 A CN1738285 A CN 1738285A CN A2004100537802 A CNA2004100537802 A CN A2004100537802A CN 200410053780 A CN200410053780 A CN 200410053780A CN 1738285 A CN1738285 A CN 1738285A
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Abstract
本发明涉及通信领域,公开了一种ErrorIndication报文处理方法,该方法能够有效防止非法攻击者通过Error Indication报文对通信网络进行破坏。本发明的原理在于,在源GSN或RNC本地PDP上下文和RAB上下文中增加了时间戳项,用于表示源GSN或RNC向目的GSN或RNC发送G-PDU报文的时刻。当收到来自目的GSN或RNC的Error Indication报文后,比较接收时刻与时间戳中的时刻的时间差是否小于预先设置的阈值,由此判断最近是否发送过与此PDP上下文或RAB上下文相联系的G-PDU报文,将非法Error Indication报文找出来并丢弃。
Description
技术领域
本发明涉及通信领域,特别涉及第三代移动通信(The Third Generation,简称“3G”)系统中的安全技术。
背景技术
随着以通信技术和计算机技术为标志的高科技的发展,蜂窝移动通信给人们带来极大的便利,目前其发展经历了三代,而今的第三代蜂窝移动通信已经取得了突破性进展,经过各种电信化标准组织的讨论和研究,它形成了三个主要的世界标准,宽带码分多址(Wideband Code Division MultipieAccess,简称“WCDMA”)就是其中最具潜力的技术之一。
WCDMA通信系统采用了无线接入网络(Radio Access Network,简称“RAN”)加核心网络(Core Network,简称“CN”)的结构。其中RAN用于处理所有与无线有关的功能,而CN处理WCDMA系统内所有的话音呼叫和数据连接,并实现与外部网络的交换和路由功能。通常也把通用移动通信系统(Universal Mobile Telecommunications System,简称“UMTS”)系统称为WCDMA通信系统。在WCDMA核心网中,UMTS/通用分组无线业务(General Packet Radio Service,简称“GPRS”)骨干网与通用无线分组服务支持节点(GPRS Support Node,简称“GSN”)之间的用户数据传输采用的是通用无线分组服务隧道协议用户面协议(GPRS Tunneling ProtocolUser,简称“GTP-U”)。同时,在无线网络控制器(Radio Network Controller,简称“RNC”)和通用分组无线业务服务支持节点(Serving GPRS SupportNode,简称“SGSN”)之间用户数据传输也采用了GTP-U协议承载。
熟悉本领域的技术人员知道,CN从逻辑上分为电路交换(CircuitSwitched,简称“CS”)域和分组交换(Packet Switched,简称“PS”)域。而第三代移动通信合作项目(The Third Generation Partnership Project,简称“3GPP”)TS 23.060中规定,3G用户在需要进行PS业务时,必须首先在3G网络中发起分组数据协议(Packet Data Protocol,简称“PDP”)上下文激活流程,即UMTS网络中通过该流程在移动台(Mobile Station,简称“MS”)和通用分组无线业务网关支持节点(GPRS Gateway Support Node,简称“GGSN”)之间创建一条供数据传输的通用无线分组服务隧道协议(GPRSTunneling Protocal,简称“GTP”)隧道。为了便于比较说明,把GPRS网络下和UMTS网络下的PDP上下文激活流程对比,二者有类似之处也有不同之处,下面结合图1,先描述协议中GPRS网络下MS激活PDP上下文的流程:
如图1所示,该过程涉及到GPRS系统中的4个组成部分和两种算法处理过程,分别为移动台10、基站子系统(Base Station System,简称“BSS”)11、第二代通用分组无线业务服务支持节点(2G-Serving GPRS Support Node,简称“2G-SGSN”)12、第二代通用分组无线业务网关支持节点(2G-GPRSGateway Support Node,简称“2G-GGSN”)13,以及小区选择算法C1算法14和小区重选算法C2算法15。其中C1算法在图1中的步骤101与步骤102间被运用,C2算法在步骤106与步骤107间被运用。
首先在步骤101,MS10向2G-SGSN12发送分组数据协议上下文激活请求,即“Activate PDP Context Request”消息。需要说明的是,这个激活请求报文是经过BSS11的GTP协议建立的隧道传送的,相当于经基站系统11透传。
接下来,在步骤102,执行安全性检查,即2G-SGSN12进行MS身份鉴别和设备检查。
随后,在步骤103,2G-SGSN12发送“Invoke Trace”到BSS11,即调用路径。
此后,在步骤104,若身份鉴别和设备检查都通过了,2G-SGSN12通过MS10提供的PDP报文信息来建立和2G-GGSN12间的PDP上下文请求。
在步骤105,2G-SGSN12对2G-GGSN13建立PDP协议上下文请求的响应。
接着,在步骤106,BSS11和2G-SGSN12执行基站分组流上下文过程。
最后,到步骤107,2G-SGSN12在它的PDP context中的GGSN地址后插入网络业务接入点标识(Network Service Access Point Identifier,简称“NSAPI”)。并向MS10返回PDP协议上下文激活完成消息,即“Activate PDPContext Aceept”。同时PDP上下文激活流程结束,一条供数据传输的GTP隧道在MS10和2G-GGSN13之间被创建。
接下来结合图2,描述协议中UMTS网络下MS激活PDP上下文的流程:
如图2所示,该过程涉及到UTMS系统中的4个组成部分和两种算法处理过程,分别为移动台20、UMTS陆地无线接入网21、第三代通用分组无线业务服务支持节点(3G-Serving GPRS Support Node,简称“3G-SGSN”)22、第三代通用分组无线业务网关支持节点(3G-GPRS Gateway Support Node,简称“3G-GGSN”)23,以及小区选择算法C1算法24和小区重选算法C2算法25。其中C1算法在图2中的步骤201与步骤202间被运用,C2算法在步骤208与步骤209间被运用。
同样,UMTS网络中,步骤201,MS20向3G-SGSN22发送分组数据协议上下文激活请求,即“Activate PDP Context Request”消息。
此后,在步骤202,3G-SGSN22通过MS20提供的PDP报文信息来建立和3G-GGSN23间的分组数据协议上下文请求。
步骤203,就是3G-GGSN23对3G-SGSN22建立PDP协议上下文请求的响应。
接下来,在步骤204,通过RAB Assignment procedure建立无线接入承载(Radio Access Bearer,简称“RAB”)。
而后步骤205中,3G-SGSN22应发送“Invoke Trace”消息,即调用路径到UTRAN21。
此后,如果在步骤202和步骤203的上下文连接中QoS属性被降低,步骤206,3G-SGSN22应通过更新PDP协议上下文请求,即“Update PDP ContextRequest”消息通知相关的3G-GGSN23。
随后步骤207,3G-GGSN23通过返回更新PDP协议上下文响应,即“Update PDP Context Response”消息证实新的服务质量(Quality of Service,简称“QoS”)属性。
最后,在步骤208,3G-SGSN22在它的“PDP context”中的GGSN地址后插入网络业务接入点标识NSAPI。并向MS20返回PDP协议上下文激活完成消息,即“Activate PDP Context Accept”消息。同时PDP上下文激活流程结束,一条供数据传输的GTP隧道在MS和3G-GGSN之间被创建。
上述两种网络下某些具体的步骤不同是因为各子系统间接口的差异形成的,总体原理上类似。由以上情况可知,3G网络在一次成功的PDP上下文激活流程完成后,MS、SGSN和GGSN中都创建了相关的PDP上下文,在RNC中创建了RAB。随后这些PDP上下文指定的GTP逻辑隧道将传送各种用户数据。
在传送用户数据的过程中,当一个GSN或者RNC向另一个GSN或RNC发送GTP数据报文时,正常情况下目的GSN或RNC将根据GTP消息头中的隧道标识查找对应的PDP上下文或RAB,根据PDP上下文或RAB中的信息处理该报文。但是也有异常的情况下,如果根据隧道标识无法找到激活的PDP上下文或RAB,则向发送源GSN/RNC发送错误指示(Error Indication)报文。当源GSN/RNC接收到该Error Indication报文时,将删除该PDP上下文。具体的Error Indication报文包含的信息组成部分由协议3GPP TS 23.090定义,参见下表:
Information element(信息成分) | Presence requirement(存在要求) | Reference(涉及协议) |
Tunnel Endpoint Identifier Data I(隧道终端标志数据) | Mandatory(必选) | 7.7.13 |
GSN Address(GSN地址) | Mandatory(必选) | 7.7.32 |
Private Extension(私有扩展) | Optional(可选) | 7.7.44 |
通过上述描述可知,在WCDMA中的用户进行数据传送时,遇到异常情况,即根据隧道标识找不到激活的PDP上下文或RAB,那么需要启动向发送源GSN或RNC发送Error Indication报文的应急机制,以保证通信系统资源不会被异常信令或者通道占用。
现有技术方案中,对于这种Error Indication报文的处理,各大移动通信设备生产商的普遍做法如图3所示,目的GSN或RNC接收到一个通用无线分组服务隧道协议-协议数据单元(GPRS Tunneling Protocal-Protocol DataUnit,简称“G-PDU”)后,如果没有对应激活的PDP上下文或者RAB上下文,则立即发送Error Indication报文。Error Indication报文到达源GSN或RNC后,源GSN或RNC立即启动应急机制,删除本地对应的PDP上下文或者RAB上下文。
需要说明的是,GTP逻辑隧道建立后,在其中进行用户数据传送时,用户数据被分割成一个一个的PDP分组数据单元,即一个个的G-PDU数据包,按照顺序发送,所以目的GSN或RNC可以针对每个G-PDU查看对应的PDP上下文或者RAB上下文。数据传送时源GSN或RNC上始终有发送的G-PDU对应的PDP上下文或者RAB上下文,可是目的GSN或RNC上有可能在异常情况下没有对应激活的PDP上下文或者RAB上下文,所以Error Indication报文要发送反馈到源GSN或RNC,不然就会始终占用源GSN或RNC的系统资源以及和目的GSN或RNC间的信道。
而另一方面,在WCDMA组网方案中,通常通过为信令消息建立加密的隧道防止来自网络的非法报文攻击,从而确保GTP-C或RANAP信令消息的安全。但是为保证用户数据的转发效率,可能对用户面通道不进行加密处理。
在实际应用中,上述方案存在以下问题:无法有效保障通信网络的安全。
造成这种情况的主要原因在于,非法攻击者有可能针对用户面通道未进行加密处理的事实,成功地利用Error Indication报文对网络进行攻击。具体的说,非法攻击者可以伪造大量虚假Error Indication报文,通过公网向GSN或RNC发送,对GSN或RNC的所有隧道端点标识符逐个进行扫描,从而造成GSN或RNC大量删除用户PDP上下文或RAB上下文,导致整个设备瘫痪。
发明内容
有鉴于此,本发明的主要目的在于提供一种Error Indication报文处理方法,使得能够有效防止非法攻击者通过Error Indication报文对通信网络进行破坏。
为实现上述目的,本发明提供了一种错误指示报文处理方法,包含以下步骤:
A在源通用无线分组服务支持节点创建每一个本地分组数据协议上下文时,在该上下文中加入时间戳项,并在每次向目的通用无线分组服务支持节点发送通用无线分组服务隧道协议-协议数据单元报文后,在对应的所述分组数据协议上下文的所述时间戳上记录当前时刻;
B当所述源通用无线分组服务支持节点收到来自所述目的通用无线分组服务支持节点的错误指示报文时,判断该错误指示报文对应的分组数据协议上下文的所述时间戳项的时间,与当前时间之间的时间差是否小于预先设置的阈值,如果是,则执行正常处理,否则,丢弃该错误指示报文。
其中,所述步骤B中,当判定错误指示报文对应的分组数据协议上下文的所述时间戳项的时间与当前时间之间的时间差不小于预先设置的阈值时,还包含对此次错误指示报文丢弃事件记录日志的步骤。
本发明还提供了一种错误指示报文处理方法,包含以下步骤:
A在源无线网络控制器创建每一个本地无线接入承载上下文时,在该上下文中加入时间戳项,并在每次向目的无线网络控制器发送通用无线分组服务隧道协议-协议数据单元报文后,在对应的所述无线接入承载上下文的所述时间戳上记录当前时刻;
B当所述源无线网络控制器收到来自所述目的无线网络控制器的错误指示报文时,判断该错误指示报文对应的无线接入承载上下文的所述时间戳项的时间,与当前时间之间的时间差是否小于预先设置的阈值,如果是,则执行正常处理,否则,丢弃该错误指示报文。
其中,所述步骤B中,当判定错误指示报文对应的无线接入承载上下文的所述时间戳项的时间与当前时间之间的时间差不小于预先设置的阈值时,还包含对此次错误指示报文丢弃事件记录日志的步骤。
通过比较可以发现,本发明的技术方案与现有技术的区别在于,在源GSN或RNC本地PDP上下文和RAB上下文中增加了时间戳项,用于表示源GSN或RNC向目的GSN或RNC发送G-PDU报文的当前时刻。当收到来自目的GSN或RNC的Error Indication报文后,比较当前时刻和时间戳中的时刻的时间差,由此判断最近是否发送过与此PDP上下文或RAB上下文相联系的G-PDU报文,将非法Error Indication报文找出来并丢弃。
这种技术方案上的区别,带来了较为明显的有益效果,即有效防止非法攻击者通过Error Indication报文对通信网络进行攻击,提高了通信网络的安全性。
附图说明
图1是现有技术中GPRS网络下的PDP上下文激活流程示意图;
图2是现有技术中UMTS网络下的PDP上下文激活流程示意图;
图3是现有技术中Error Indication报文处理流程示意图;
图4是根据本发明的一个实施例的Error Indication报文处理方法的流程示意图。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚,下面将结合附图对本发明作进一步地详细描述。
总的来说,本发明的原理在于,通过在源GSN或RNC本地PDP上下文和RAB上下文中,增加用于表示源GSN或RNC向目的GSN或RNC发送G-PDU报文的当前时刻的时间戳,并在收到来自目的GSN或RNC的ErrorIndication报文后,比较当前时刻和时间戳中的时刻的时间差,由此判断最近是否发送过与此PDP上下文或RAB上下文相联系的G-PDU报文,如果没有,则可办定该Error Indication报文是非法的,并丢弃。从而确保了有效防止非法攻击者通过Error Indication报文对通信网络进行攻击。
下面结合图4,根据本发明的一个实施例展开,进一步解释和说明本发明提出的Error Indication报文处理方法的原理和工作流程。
熟悉本领域的技术人员知道,作为第三代移动通信系统(ThirdGeneration,简称“3G”)两大主流体制之一的宽带码分多址(Wide CodeDivision Multiple Access,简称“WCDMA”)系统,从功能上看,由三大部分组成:核心网(Core Network,简称“CN”)、UMTS地面无线接入网(UMTSTerrestrial Radio Access Network,简称“UTRAN”)和用户设备(UserEquipment,简称“UE”)。CN一般兼容无线分组服务(General Packet RadioService,简称“GPRS”)网,它包含的两个重要的网元分别是GPRS服务支持节点(Serving GPRS Support Node,简称“SGSN”)和GPRS网关支持节点(Gateway GPRS Support Node,简称“GGSN”)。UTRAN由一个或多个无线网络子系统(Radio Network Subsystem,简称“RNS”)构成,而一个RNS则由一个无线网络控制器(Radio Network Controller,简称“RNC”)和一个或者多个B节点构成。UE则是与用户的接口,一般是我们常见的手机。
当3G用户需要进行分组交换(Packet Switch,简称“PS”)业务时,必须首先连接到3G网络上,使得用户从空闲状态转变为就绪状态,该就绪状态就是用户已经连接到3G并处于启动分组数据协议(Packet Data Protocol,简称“PDP”)连接的状态。当用户处于就绪状态时,接着便将进入图4中本发明的流程。
如图4所示,首先在步骤501中发起并激活PDP上下文流程。在此流程中,用户首先向用户其所在的源网关支持节点(GPRS Support Node,简称“GSN”)发送一条激活PDP上下文请求的消息;当源GSN收到该消息后,将判断是否执行鉴权加密程序,如果为匿名接入则就不需要执行鉴权加密程序;执行完鉴权加密程序后,源GSN根据PDP上下文签约记录中相关内容来验证用户,然后向分组数据接受者所在的目的GSN发创建PDP上下文请求消息;目的GSN收到创建PDP上下文请求消息之后,将向源GSN返回一条创建PDP上下文响应消息;源GSN收到目的GSN发来的创建PDP上下文消息之后,接着向用户返回一条激活PDP上下文接受的消息,该消息中包含PDP类型,PDP地址,用户和目的GSN的路由等信息。用户收到源GSN发送过来的激活PDP上下文接受后,就进入了PDP激活状态。
随后执行步骤502。在本步骤中,源GSN或RNC创建相关本地PDP上下文或相关本地RAB上下文。需要说明的是,本发明中源GSN或RNC还在PDP上下文或RAB上下文中新增加了一个时间戳项。
该时间戳项的用处在于,当源GSN或RNC向目的GSN或RNC转发GPRS隧道协议(GPRS Tunnel Protocol,简称“GTP”)报文时,在时间戳项上记录当前转发时间。当目的GSN或RNC收到GTP报文却没有找到相对应的PDP上下文或RAB上下文,向源GSN或RNC反馈回错误提示(ErrorIndication,简称“EI”)消息时,就可以依据时间戳上记录的转发时间来判断最近是否转发过与该Error Indication报文所对应的GTP报文,如果最近确实转发过与此Error Indication报文对应的GTP报文,则对相应的PDP上下文或RAB上下文进行处理;如果没有转发过此EI对应的报文,则断定该EI为非法消息,并舍弃该Error Indication报文,这就有效的防止了黑客利用非法Error Indication报文进行的非法攻击;这实际上就是一种超时思想。而在现有技术中,由于本地PDP上下文或RAB上下文中没有时间戳项,因此即使当源GSN或RNC接收到非法Error Indication报文时,它也判定该非法ErrorIndication报文为合法,并依据该非法Error Indication报文删除相关本地PDP上下文或RAB上下文。
另外,本发明中,源GSN或RNC向目的GSN或RNC转发报文后,启动一个计数器,预先设置一个阀值,该阀值是源GSN或RNC判断接收到的Error Indication报文是否合法的依据。因此该阀值应该合理设置,既不能太大也不能太小。如果设定的阀值太大,则就可能将接收到的从其他公众网上发送过来的非法Error Indication报文判为合法,并删除对应的PDP上下文或RAB上下文,使系统设备瘫痪;如果设定的阀值太小,则就可能将接收到的从目的GSN或RNC反馈回来的合法Error Indication报文判为非法,并丢弃该合法Error Indication报文,继续保留本来应该删除的PDP上下文或RAB上下文,使得源GSN或RNC上的信息冗余。所以首先应当根据传输路径和当前网络传输拥塞情况,计算报文在源GSN或RNC和目的GSN或RNC之间来回传输所需要的平均时间,然后将阀值设置为等于或略大于该平均时间,这样就使得误判率尽可能的最小。源GSN或RNC设置好阀值后,就进入步骤503。
接着,在步骤503中,目的GSN或RNC收到源GSN或RNC发送过来的GTP报文,然后判断根据上述GTP报文是否能查找到对应的PDP上下文或RAB上下文。在该步骤中,目的GSN或RNC依据从GTP报文头部提取的隧道标志来查找是否有对应的PDP上下文或RAB上下文,该PDP上下文或RAB上下文在业务开始时由步骤501的激活流程创建。
如果目的GSN或RNC丢失了激活的PDP上下文或RAB上下文,则依据隧道标志查找不到对应的激活的PDP上下文或RAB上下文,进入步骤505;如果能找到对应的激活的PDP上下文或RAB上下文,则进入步骤504。
在步骤504中,目的GSN或RNC根据找到的PDP上下文或RAB上下文的信息对接收到的GTP报文进行处理,同时返回消息给源GSN或RNC,告诉源GSN或RNC目的GSN或RNC已经找到对应的PDP上下文或RAB上下文并正在将收到的GTP报文进行转发。然后,目的GSN或RNC首先将报文转发到目的用户所在的RNC,RNC接收到报文后,把报文转发到目的用户所在的B节点,最后通过B节点的无线接口发给目的用户,完成分组数据的传输。接着进入步骤509。
在步骤505中,由于目的GSN或RNC没有查到到对应的激活PDP上下文或RAB上下文,于是向源GSN或RNC发送Error Indication报文,该ErrorIndication报文包含隧道端点标志符数据、GSN地址、加密信息。其中隧道端点标志符数据项和GSN地址项必须填写,而加密项可填写可不填写,由对应的信令消息决定。如果信令消息传输的隧道是加密的,则加密项需要填写;如果信令消息传输的隧道没有加密,则加密项不需要填写。现有技术中为了保证用户数据的转发效率,一般没有对用户面通道进行加密处理,这就使得黑客伪造大量虚假Error Indication报文利用公众网进行非法攻击成为可能。
当源GSN或RNC收到由目的GSN或RNC发送过来的Error Indication报文后,进入步骤506,源GSN或RNC查看Error Indication报文对应的PDP上下文或RAB上下文上时间戳项由步骤502记录的时间,然后用当前时间减去时间戳项记录的时间得到一个时间差,比较该时间差和源GSN或RNC设置的阀值的大小,如果该时间差小于阀值,则进入步骤507;如果该时间差大于阀值,则进入步骤508。
在步骤507中,由于时间差小于阀值,而阀值是按照最小误判率设置的,所以我们认定该目的GSN或RNC发送过来的Error Indication报文是合法的,它同时也表明目的GSN或RNC对应的PDP上下文或RAB上下文由于某种特殊原因已经丢失,找不到分组数据的传输路径,分组业务不能继续下去。所以源GSN或RNC删除Error Indication报文对应的由步骤502发送的GTP所触发PDP上下文或RAB上下文,释放现已失效的PDP连接所占用的传输隧道以及为该失效的PDP连接所分配的资源,同时返回消息给发起本次分组交换业务的用户,告诉该用户此次连接已经失败,数据不能送达目的用户,接着系统查看资源等待队列信息。
在这种情况下,如果系统资源等待队列不为空,则将该用户加入资源等待队列链尾,并选中资源等待队列链头的用户,为链头用户发起的分组交换业务申请相关资源,同时返回消息给该用户告诉用户请稍后重新发起分组交换业务请求;如果系统资源等待队列为空,则将该用户加入资源等待队列链头并选中该用户,为该用户的此次分组交换业务重新申请相关资源,同时返回消息给该用户告诉该用户系统正在尝试重新连接,请该用户稍等。当然为了避免由于某种特殊原因(比如目的用户所在的GSN或RNC暂时不可用或突然损坏)而无限重连,系统应设定重连上限次数,重连次数超过次数上限就不再重连。
另一方面,在步骤508中,由于时间差大于阀值,而阀值是按照最小误判率设置的,所以我们认定源GSN或RNC接收的该Error Indication报文是非法的,于是继续保留由步骤502所创建的PDP上下文或RAB上下文,并丢弃该非法Error Indication报文并记录日志。
当然,这样操作还是有可能将由于某种特殊原因(比如网络拥塞)而到达源GSN或RNC时超过计数初值的合法Error Indication报文丢弃,使得源GSN或RNC继续保留已经失效的PDP上下文或RAB上下文,浪费系统资源。为了避免这种情况发生,当超过计数初值时,系统还没有接收到目的GSN或RNC返回的找到对应PDP上下文或RAB上下文的信息,就重新发送GTP报文。另一方面,系统也可设定一个重发次数上限,重发次数超过次数上限时就不再重发,系统此时也认定目的GSN或RNC已经丢失了对应的PDP上下文或RAB上下文,于是源GSN或RNC删除对应的PDP上下文或RAB上下文,释放本次现已失效的PDP连接所占用的传输隧道以及为该已经失效的PDP连接所分配的资源,同时返回消息给发起本次分组交换业务的用户,告诉该用户此次连接已经失败,数据不能送达目的用户。
接下来的操作和步骤507完全一样,系统查看资源等待队列,如果队列不为空则选取队列头用户为他申请相关资源;如果为空则选中该用户为该用户重新申请资源。具体操作细节这里就不再累述。
在步骤509中,分组数据已经正确到达目的用户,此次分组数据交换业务已经完成,于是系统去激活PDP上下文。具体的说,首先用户发送去激活PDP上下文请求给它所在的源GSN;然后源GSN执行鉴权加密程序来验证用户,接着向目的用户所在的目的GSN发送删除PDP上下文请求;目的GSN收到删除PDP上下文请求消息之后,将向源GSN返回一条删除PDP上下文响应消息;源GSN收到目的GSN发来的删除PDP上下文响应消息之后,接着向用户返回一条删除PDP上下文接受的消息;用户收到删除PDP上下文接受的消息后就完成了PDP上下文的去激活流程,系统释放为本次分组交换业务分配的所有资源。
虽然通过参照本发明的某些优选实施例,已经对本发明进行了图示和描述,但本领域的普通技术人员应该明白,可以在形式上和细节上对其作各种各样的改变,而不偏离所附权利要求书所限定的本发明的精神和范围。
Claims (4)
1.一种错误指示报文处理方法,其特征在于,包含以下步骤:
A在源通用无线分组服务支持节点创建每一个本地分组数据协议上下文时,在该上下文中加入时间戳项,并在每次向目的通用无线分组服务支持节点发送通用无线分组服务隧道协议-协议数据单元报文后,在对应的所述分组数据协议上下文的所述时间戳上记录当前时刻;
B当所述源通用无线分组服务支持节点收到来自所述目的通用无线分组服务支持节点的错误指示报文时,判断该错误指示报文对应的分组数据协议上下文的所述时间戳项的时间与当前时间之间的时间差,是否小于预先设置的阈值,如果是,则执行正常处理,否则,丢弃该错误指示报文。
2.根据权利要求1所述的错误指示报文处理方法,其特征在于,所述步骤B中,当判定错误指示报文对应的分组数据协议上下文的所述时间戳项的时间与当前时间之间的时间差不小于预先设置的阈值时,还包含对此次错误指示报文丢弃事件记录日志的步骤。
3.一种错误指示报文处理方法,其特征在于,包含以下步骤:
A在源无线网络控制器创建每一个本地无线接入承载上下文时,在该上下文中加入时间戳项,并在每次向目的无线网络控制器发送通用无线分组服务隧道协议-协议数据单元报文后,在对应的所述无线接入承载上下文的所述时间戳上记录当前时刻;
B当所述源无线网络控制器收到来自所述目的无线网络控制器的错误指示报文时,判断该错误指示报文对应的无线接入承载上下文的所述时间戳项的时间与当前时间之间的时间差,是否小于预先设置的阈值,如果是,则执行正常处理,否则,丢弃该错误指示报文。
4.根据权利要求3所述的错误指示报文处理方法,其特征在于,所述步骤B中,当判定错误指示报文对应的无线接入承载上下文的所述时间戳项的时间与当前时间之间的时间差不小于预先设置的阈值时,还包含对此次错误指示报文丢弃事件记录日志的步骤。
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