阿朗 PS核心网参数及网络优化介绍

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新一代智能GGSNAlcatel内容计费解决方案MobileCommunicationGroupAlcatelShanghaiBellJuly2004PS核心网参数及网络优化介绍Oct.20092PresentationTitle—2Allrightsreserved©2003,AlcatelShanghaiBellPSCN部分参数介绍GTP的N3/T3设置MAP版本设置ARD控制参数APN扩展功能APN模糊匹配功能GGSN的负荷分担TrafficClassSubscriptionCheck说明3PresentationTitle—3Allrightsreserved©2003,AlcatelShanghaiBellGTP的N3/T3设置(1)为了保证GTP信令/数据的可靠传输,定义了N3计数器和T3定时器,包括:N3RequestEcho,T3ResponseEchoN3RequestCreate,T3ResponseCreateN3RequestDelete,T3ResponseDelete等N3是指消息最多重复发送的次数,T3表示等待对方回响应消息的最长时间;Echoreq/rsp消息是GSN之间,或GSN和RNC之间检测对端是否存活的消息,分为控制面Echo和用户面Echo;4PresentationTitle—4Allrightsreserved©2003,AlcatelShanghaiBellGTP的N3/T3设置(2)SGSNEchoRequestEchoResponseGGSNCreatePDPContextRequestCreatePDPContextResponseActivatePDPContextRequestActivatePDPContextResponse5PresentationTitle—5Allrightsreserved©2003,AlcatelShanghaiBellGTP的N3/T3设置(3)SGSN中各N3/T3的默认设置即为建议值,一般不更改,如:PARAMETERNAME=N3RequestCreateTYPE=INTEGERVALUE=5RANGE=5..5VISIBILITY=YesMODE=StaticDESCRIPTION=MaxnumberofattemptsmadebyGTP-CtosendaCreateRequestmessage(29.060)RESPONSIBILITY=Site/6PresentationTitle—6Allrightsreserved©2003,AlcatelShanghaiBellGTP的N3/T3设置(4)PARAMETERNAME=T3ResponseCreateTYPE=INTEGERVALUE=2RANGE=1..3VISIBILITY=YesMODE=StaticDESCRIPTION=MaxwaittimeforaresponseofaCreatePDPContextRequestmessage(29.060)RESPONSIBILITY=Site/其它:N3RequestEcho=5,T3ResponseEcho=10sN3RequestDelete=5,T3ResponseDelete=2sT3GtpuKeepAliveEcho=60s…7PresentationTitle—7Allrightsreserved©2003,AlcatelShanghaiBellMAP版本设置(1)参数MapAc_infoRetrieval用于设置SGSN的MAP版本:PARAMETERNAME=MapAc_infoRetrievalTYPE=INTEGERVALUE=3RANGE=0..3VISIBILITY=NoMODE=Read_onlyDESCRIPTION=ApplicationcontextversionforinfoRetrieval(29.002)RESPONSIBILITY=Product/8PresentationTitle—8Allrightsreserved©2003,AlcatelShanghaiBellMAP版本设置(2)在2008年的2G网络演进项目测试中,有一个用例测试2G/3G用户鉴权功能,需要修改MAP参数。该用例的测试目的是当2GSGSN支持AC版本为V3,验证3G用户成功登网后能漫游到2G网络,同时验证2GSGSN支持鉴权五元组转三元组功能。测试预置条件:1)用户为3G双模终端+USIM,登陆到3G网络中;2)用户已经签约HLR五元组,该用户可以漫游到2G网络;3)2G网络已完成鉴权AC版本改造,SGSN开启五元组鉴权功能,同时支持转化为2G鉴权和加密所需的参数;测试步骤:1)用户在2G网络开机,发起位置更新;2)用户发起鉴权请求;9PresentationTitle—9Allrightsreserved©2003,AlcatelShanghaiBellMAP版本设置(3)信令流程:HLR2GSGSN3GSGSNSend_authentication_info_reqSend_authentication_info_responseUpdate_GPRS_Location_req.Insert_Subscriber_dataInsert_Subscriber_dataackUpdate_GPRS_Location_ackCancel_LocationCancel_LocationackBSS/UEAttach_req.Authentication_req.Authentication_resp.Cipher_mode_commandCipher_mode_completeAttach_AcceptAttach_Complete10PresentationTitle—10Allrightsreserved©2003,AlcatelShanghaiBellMAP版本设置(4)测试结果:1)用户位置更新成功;2)SGSN鉴权请求的AC版本为V3;3)SGSN完成CK,IK-Kc的转换;4)Send_Authentication_Info_Reqsponse:HLR中返回的鉴权集为五元组;5)AuthenticateRequest消息中下发RAND,AUTN,AuthenticationResponse返回RES;HLR根据SGSN发起的MAP是V3版本请求消息Send_Authentication_Info_Req,向SGSNSend_Authentication_Info_Rsp中返回的鉴权集为五元组。在SGSN中完成了鉴权五元组到三元组的转换,然后跟2G无线完成了鉴权交互。11PresentationTitle—11Allrightsreserved©2003,AlcatelShanghaiBellARD控制参数(1)ARD参数用以控制每个用户是否可以从2G无线或者3G无线登记入网;用户的ARD参数在HLR中设置,通过ISD消息通知SGSN/MSC,由SGSN/MSC控制用户的接入行为。12PresentationTitle—12Allrightsreserved©2003,AlcatelShanghaiBellARD控制参数(2)某用户在HLR中签约有ARD数据,ARD=UTRANNotAllowed/GREANAllowed;用户开机试图登入3G无线网络HLR3GSGSNUpdate_LocationInsert_Subscriber_data(ARD=#80)Insert_Subscriber_dataackUpdate_LocationackRNC/UEAttachreq.Attach_Rejcet(#15)13PresentationTitle—13Allrightsreserved©2003,AlcatelShanghaiBellARD控制参数(3)3GSGSN根据用户的ARD设置,将该用户拒绝,原因值为NoSuitableCellsInLocationArea如果本区域还有2G网络,用户应可重新发起位置更新请求通过BSS接入SGSN:HLR3GSGSNUpdate_LocationInsert_Subscriber_data(ARD=#80)Insert_Subscriber_dataackUpdate_LocationackRNC/UEAttachreq.Attach_Rejcet(#15)14PresentationTitle—14Allrightsreserved©2003,AlcatelShanghaiBellARD控制参数(4)2008年4月在网络演进项目测试中,发现当用户在阿朗HLR中签约ARD取值为ARD=UTRANAllowed/GREANAllowed时,HLR发出的ISD消息中不含有ARD字段。根据3GPPTS23.012(V720)中的说明,只有当网络需要限制用户使用某些特定的无线资源时,HLR才会在ISD消息中带出ARD字段,反之则不带;IftheHPLMNappliestheAdministrativeRestrictionofSubscribers’Accessfeature,theHLRshallconveythesubscriberaccessrestrictionparameter(AccessRestrictionData)totheVLR.TheVLRshallcheckthissubscriptionparameteragainsttheradioaccesstechnologythatsupportstheLA/RAinwhichtheUEisroamingtodecidewhetherthelocationupdateshouldbeallowedorrejected.15PresentationTitle—15Allrightsreserved©2003,AlcatelShanghaiBellARD控制参数(5)因此当ARD=UTRANAllowed/GERANAllowed的用户发起注册请求时,阿朗的HLR回的ISD中没有带ARD字段。同时,根据3GPPTS29.002(V850)中的说明,当ISD消息里不带ARD字段时,VLR/SGSN就认为该用户没有UTRAN或GERAN的限制,无须对用户使用的无线资源加以限制。ThisparameterindicatestheallowedRATaccordingtosubscriptiondata.(seeclause7.6.3.96)IftheVLR/SGSNsupportstheAccessRestrictionfeaturebutdoesnotreceivetheAccessRestrictionDataparameterfromtheHLRatlocationupdatingorrestoration,theVLR/SGSNshallassumethatthesubscriber'sprofiledoesnothaveanyrestrictionsenabled.16PresentationTitle—16Allrightsreserved©2003,AlcatelShanghaiBellAPN扩展功能(1)用户在激活PDP时,SGSN在APN上添加MSISDN的部分字段,DNS通过这个字段,实现归属GGSN解析,使该用户可以回归属地GGSN激活PDP。该功能涉及到得参数有:PARAMETERNAME=HPLMN_CC_LengthTYPE=INTEGERVALUE=2RANGE=1..3VISIBILITY=YesMODE=DynamicDESCRIPTION=lengthofMSISDN.CCRESPONSIBILITY=Site/该参数定义了国家码长度,中国CC=86,是两位。17PresentationTit

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