GPRS上网流程概述

1、GPRS上网流程概述,第一部分 PS域核心网架构 第二部分 GPRS上网原理概述 第三部分 测试实例,目录,2,PS域核心网架构,无线侧,2,3,控制面协议栈,4,用户面协议栈,5,手机如何上网？,第一部分 PS域核心网架构 第二部分 GPRS上网原理概述 第三部分 测试实例,目录,7,上网第一步：GPRS附着,MM上下文,存储在MS和SGSN中, HLR中也有部分内容,包括用户状态、位置数据、终端能力等,是移动性管理的基础,一个用户对应一个MM上下文,一个MM上下文可对应多个PDP上下文,MM上下文,9,以保存在SGSN中的MM上下文为例，MS中保存的MM上下文略有不同。,MM上下文内容,1

2、0,A/Gb Mode MM State,Idle状态：用户未附着。MS 和SGSN无有效的位置信息和路由信息。此时无法PS寻呼到用户。 Standby状态：用户已附着。SGSN中对MS的位置信息精确到路由区。SGSN若有下行信令或数据，需要下发寻呼。 Ready状态：用户已附着。 SGSN中对MS的位置信息精确到小区。SGSN向MS直接发送下行信令或数据，不需要寻呼。,11,Iu Mode MM State,PMM-DETACHED状态：MS 和SGSN无有效的位置信息和路由信息。此时无法PS寻呼不到用户。 SGSN的MM上下文中无有效的信息 PMM-IDLE状态：SGSN上MS的位置信息精

3、确到路由区，若要下发数据或信息，需要先进行寻呼。 SGSN与MS间不存在信令连接. PMM-CONNECTED状态：SGSN上MS的位置信息精确到Serving RNC。 SGSN与MS存在信令连接.,为什么在PS域定义多种业务状态？,连接建立,连接释放,CS域的业务特点：,时间,小时,秒,PS域的业务特点：,突发性,MS,New SGSN,Attach Request,Attach Accept,Old SGSN,Identification Request,Identification Response,Identity Response,Identity Request,GGSN,HLR

4、,Authentication,Delete PDP Context Request,Delete PDP Context Response,Update GPRS Location,Update GPRS Location ACK,Cancel Location,Insert Subscriber Data,Cancel Location ACK,Insert Subscriber Data ACK,Attach Complete,GPRS附着流程,Delete PDP Context Request,Delete PDP Context Response,GPRS附着流程,MS,New S

5、GSN,Attach Request,Attach Accept,HLR,Authentication,Update GPRS Location,Update GPRS Location ACK,Insert Subscriber Data,Insert Subscriber Data ACK,Attach Complete,场景： 用户首次附着，使用IMSI发起附着。,Attach Type IMSI Old RAI GPRS CKSN MS network capability MS Radio Access capabilty DRX parameter Requested READY

6、timer,IMSI SGSN address SGSN number GPRS enhancements support indicator,IMSI MSISDN ODB Regional Subscription Data NAM GPRS Subscription Data Subscribed Charging Characteristics Access Restriction Data,Attach result RAI Force to standby Periodic RA update timer Radio priority for SMS Radio priority

7、for TOM8 P-TMSI signature Allocated P-TMSI Negotiated READY timer Cell Notification,GPRS附着流程,MS,New SGSN,Attach Request,Attach Accept,HLR,Authentication,Attach Complete,场景二： 用户在本SGSN上附着过，其SGSN上已经建立的MM上下文还存在。,Attach Type P-TMSI P-TMSI signature Old RAI GPRS CKSN MS network capability MS Radio Access

8、capabilty DRX parameter Requested READY timer,GPRS附着流程,MS,New SGSN,Attach Request,Attach Accept,Identity Request,Identity Response,GGSN,HLR,Authentication,Update GPRS Location,Update GPRS Location ACK,Insert Subscriber Data,Insert Subscriber Data ACK,Attach Complete,场景三： 用户在本SGSN上附着过，但SGSN上的MM上下文已不存

9、在。,Attach Type P-TMSI P-TMSI signature Old RAI GPRS CKSN MS network capability MS Radio Access capabilty DRX parameter Requested READY timer,Identity type Force to standy,Mobile identity,GPRS附着流程,MS,New SGSN,Attach Request,Attach Accept,Old SGSN,Identification Request,Identification Response,Identit

10、y Request,Identity Response,GGSN,HLR,Authentication,Delete PDP Context Request,Delete PDP Context Response,Update GPRS Location,Update GPRS Location ACK,Cancel Location,Insert Subscriber Data,Cancel Location ACK,Insert Subscriber Data ACK,Attach Complete,场景三： 用户在其他SGSN上附着过,上网第二步： MS发起的PDP激活过程,19,19,

11、会话管理的核心PDP上下文,PDP：Packet Data Protocol 分组数据协议 PDP上下文：一组与PDP相关的信息,PDP上下文的定义,21,以保存在SGSN中的PDP上下文为例：,PDP上下文的内容,22,Deactivate PDP Context MM State change to IDLE(Gb mode) or PMM-DETACHED(Iu mode),Activate PDP Context,PDP上下文的状态,MS,SGSN,GGSN,Activate PDP Context Request,DNS,Create PDP Context Request,Stan

12、dard Query,Standard Query Ack,Create PDP Context Response,OCS,CCR(I),CCA(I),RNC,RAB Assignment Reqeuast,RAB Assignment Response,Activate PDP Context Accept,MS发起的PDP上下文激活流程,MS,SGSN,GGSN,Activate PDP Context Request,DNS,Create PDP Context Request,Create PDP Context Response,OCS,BSC,Activate PDP Contex

13、t Accept,MS发起的PDP上下文激活（Gb模式）,场景一： MS从2G发起PDP激活,GTP header IMSI MSISDN End User Address Access Point Name NSAPI SGSN Address for signaling SGSN Address for user traffic TEID Data I TEID Control Plane Charging Characteristics QoS profile TFT RAT Type User Location Information IMEI(SV）,Negotiated LLC S

14、API Negotiated QoS Radio priority PDP Address Protocol configuration options,Requested NSAPI Requested LLC SAPI Requested QoS Requested PDP Address Access Point Name,GTP header Cause TEID Data I TEID Control Plane Charging ID End User Address GGSN Address for Control Plane GGSN Address for user traf

15、fic,MS,SGSN,GGSN,Activate PDP Context Request,DNS,Create PDP Context Request,Create PDP Context Response,OCS,RNC,RAB Assignment Reqeuast,RAB Assignment Response,Activate PDP Context Accept,MS发起的PDP上下文激活（Iu模式）,场景二： MS从3G发起PDP激活,26,PDP上下文其他场景,27,APN-Access Point Name,APN：GPRS网络到其他计算机的网关名,示例： uninet. m

16、nc001.mcc460. gprs,3gnet /3gwap /uninet /uniwap 用户向网络侧提供APN 用于SGSN选择接入哪个GGSN 用于GGSN选择接入哪个外部网络,28,APN扩展功能,示例： MSISDN: 8618601102531 uninet. 1860110. mnc001.mcc460. gprs,APN扩展： network id.*.mnc.mcc.gprs,SGSN可以对特定的用户上报的APN进行特定扩展处理：,第一部分 PS域核心网架构 第二部分 GPRS上网原理概述 第三部分 测试实例,目录,30,Attach Request(使用IMSI),At

17、tach Type IMSI Old RAI GPRS CKSN MS network capability MS Radio Access capabilty DRX parameter Requested READY timer,31,Update GPRS Information,IMSI SGSN address SGSN number GPRS enhancements support indicator,32,Insert Subscriber Data,IMSI MSISDN ODB Regional Subscription Data NAM GPRS Subscription

18、 Data Subscribed Charging Characteristics Access Restriction Data,33,Attach Accept,Attach result RAI Force to standby Periodic RA update timer Radio priority for SMS Radio priority for TOM8 P-TMSI signature Allocated P-TMSI Negotiated READY timer Cell Notification,34,Attach Complete,若SGSN为MS重分配了P-TM

19、SI，则MS要向SGSN发送Attach Complete消息予以确认,35,Requested NSAPI Requested LLC SAPI Requested QoS Requested PDP Address Access Point Name,Active PDP Context Request,36,GTP header IMSI MSISDN End User Address Access Point Name NSAPI SGSN Address for signaling SGSN Address for user traffic TEID Data I TEID Control Plane Charging Characteristics QoS profile TFT RAT Type User Location Information IME