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标题:
ims架构
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时间:
2015-2-3 09:53
作者:
ythaijun
标题:
ims架构
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[size=256px]总体架构
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[size=179px]
如上图所示,
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[size=169px]
IMS
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[size=179px]
总体架构通常分为三层,接入层、呼叫控制层、业务应用层:
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[size=193px]接入层:
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[size=193px]接入层将各种接入网络汇总到
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[size=193px]IMS
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[size=193px]核心网中,
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[size=193px]完成对现有网络的
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[size=193px]互通及完成对承载的控制。
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[size=160px]
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[size=169px]呼叫控制层:
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[size=169px]IMS
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[size=169px]的核心层,完成呼叫控制、安全管理、业务触发、资源控制、网
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[size=169px]络互通等核心功能。
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[size=160px]
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[size=169px]业务应用层:
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[size=169px]提供各种业务实现,
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[size=169px]如
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[size=169px]PSTN
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[size=169px]仿真业务集、
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[size=169px]Centrex
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[size=169px]业务集、
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[size=169px]呈现业务、
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[size=169px]即时消息业务等。
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上图中,
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[size=169px]
IMS
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[size=179px]
网络主要网元功能说明如下:
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[size=193px]SIP
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[size=193px]Terminals
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[size=193px]:
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[size=193px]包括
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[size=193px]SIP
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[size=193px]软终端、
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[size=193px]SIP
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[size=193px]硬终端、
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[size=193px]SIP
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[size=193px]IAD
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[size=193px]接入设备、
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[size=193px]SIP
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[size=193px]AG
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[size=193px]接入设备等,当前我们设备就属于这一类。
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[size=160px]
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[size=169px]GGSN
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[size=169px]:
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[size=169px]GGSN
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[size=169px]是
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[size=169px]GPRS
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[size=169px]网络中的关键部分,用于
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[size=169px]GPRS
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[size=169px]网络和
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[size=169px]IP
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[size=169px]网络的交互。
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[size=160px]
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[size=169px]PDF
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[size=169px]:
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[size=169px]PDF
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[size=169px]是策略决策功能模块,基于策略控制完成鉴权、业务请求许可、
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[size=169px]Qos
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[size=169px]、资
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[size=169px]源预留等功能。
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[size=160px]
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[size=169px]BGCF
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[size=169px]:
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[size=169px]BGCF
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[size=169px]是出口网关控制功能,
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[size=169px]BGCF
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[size=169px]有基于电话号码的路由功能,用来选择与
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[size=169px]PSTN
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[size=169px]网络的接口点,当
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[size=169px]BGCF
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[size=169px]发现被叫网络位于一个
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[size=169px]PSTN
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[size=169px]网络时,负责
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[size=169px]IMS
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[size=169px]网络
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[size=169px]到
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[size=169px]CS/PSTN
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[size=169px]网络呼叫选择合适的
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[size=169px]MGCF
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[size=169px]。
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[size=160px]
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[size=169px]MGCF
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[size=169px]:媒体网关控制功能,负责
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[size=169px]IMS
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[size=169px]网络与
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[size=169px]CS
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[size=169px]网络之间进行通信
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[size=160px]
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[size=169px]IM-MGW
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[size=169px]:
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[size=169px]IMS
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[size=169px]多媒体网关提供
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[size=169px]CS
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[size=169px]与
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[size=169px]IMS
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[size=169px]之间的用户平面链路转换,类似
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[size=169px]H248
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[size=169px]终
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[size=169px]端设备就是属于这一类。
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[size=160px]
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[size=169px]P-CSCF
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[size=169px]:代理呼叫控制功能模块,是
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[size=169px]IMS
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[size=169px]核心网络与用户终端的接口网元;与用户
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[size=169px]终端侧配合完成
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[size=169px]AKA
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[size=169px]鉴权、安全机制协商、
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[size=169px]IPSec
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[size=169px]加密保护、信令压缩等功能,在与
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[size=169px]有
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[size=169px]PDF
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[size=169px]功能模块的接入终端还可以配合完成资源预留功能;
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[size=169px]与
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[size=169px]I-CSCF/S-CSCF
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[size=169px]侧配合
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[size=169px]完成呼叫的接续处理。
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[size=160px]
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[size=169px]I-CSCF
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[size=169px]:问询呼叫控制功能模块,为归属网络中
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[size=169px]P-CSCF
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[size=169px]的呼入选择
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[size=169px]合适的
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[size=169px]S-CSCF
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[size=169px],
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[size=169px]为拜访网络的外部
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[size=169px]IMS
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[size=169px]网提供接入。
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[size=160px]
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[size=169px]S-CSCF
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[size=169px]:
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[size=169px]服务呼叫控制功能模块,
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[size=169px]IMS
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[size=169px]核心网中呼叫控制核心模块,
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[size=169px]负责对终端的注
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[size=169px]册鉴权、会话控制、用户业务信息管理及向
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[size=169px]AS
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[size=169px]触发指定业务等功能。
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[size=160px]
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[size=169px]HSS
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[size=169px]:归属用户服务模块,
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[size=169px]IMS
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[size=169px]网络中核心用户数据库,保存归属网络中
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[size=169px]IMS
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[size=169px]用户的
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[size=169px]签约信息,包括基本标识、路由信息、业务签约信息等。
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[size=160px]
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[size=169px]SLF
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[size=169px]:签约数据定位功能模块,当运营商网络中存在多个
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[size=169px]HSS
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[size=169px]时,为
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[size=169px]I-CSCF/S-CSCF
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[size=169px]选择合适的
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[size=169px]HSS
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[size=169px]。
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[size=160px]
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[size=169px]MRFC
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[size=169px]:媒体资源功能控制器,解析来自
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[size=169px]S-CSCF
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[size=169px]、
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[size=169px]AS
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[size=169px]的资源控制命令,并控制
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[size=169px]MRFP
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[size=169px]提供媒体资源,如三方会议混音、通告音等。
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[size=160px]
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[size=169px]MRFP
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[size=169px]:媒体资源功能处理器,在
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[size=169px]MRFC
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[size=169px]控制下,为终端提供媒体资源。
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[size=160px]
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[size=169px]SIP AS
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[size=169px]:
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[size=169px]SIP
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[size=169px]应用服务器,提供各种业务处理,如仿真
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[size=169px]PSTN
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[size=169px]业务、
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[size=169px]Centrex
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[size=169px]业务等
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