【整理】RCS相关协议学习：IR.90-v16.0.pdf RCS Interworking Guidelines

• RCS NNI
• RCS的NNI，用的是：IMS NNI
• 也可以用其他替代品：
• Mw/Gi/SGi接口
• Ici/Izi接口
• IMS NNI架构
• RCS NNI之所以要用IMS NNI是因为
• （3GPP定义的）IMS核心系统 实现了很多关键功能
• 比如
• SIP的
• 信号传输signalling
• 认证authentication
• 授权authorization
• 收费charging
• 路由支持routing support
• 详见
• IR65中的Interworking Guidelines
• IPX=IP eXchange=IP Packet Exchange=IP数据包交换
• 简介
• 一句话简介
• an inter-service Provider IP backbone
• IPX is a global, private, IP network which supports end-to-end quality of service and the principle of cascading interconnect payments
• 详细解释
• IPX is completely separated from the public Internet
• The IPX architecture consists of different IPX Providers connecting together via an IPX peering point for traffic exchange
• Both signalling (such as SIP) and media (such as Real-time Transport Protocol (RTP) is transported within the IPX network
• In IPX all parties are bound by the end-to-end SLA
• IPX can be used to transport any IP based service between Service Providers, both in roaming and interworking scenarios.
• 架构
• High-Level View of IPX
• 
• Capability Discovery=能力发现
• 2种方式
• 基于SIP OPTIONS
• 基于Presence
• 消息Messaging和文件传输File Transfer
• 概述
• 单独消息Standalone messaging、单聊Chat、群聊Group Chat、文件传输File Transfer，都要用到：
• （1个或多个）SIP的头header的字段field
• 其是由：OMA CPM 定义的
• 其在NNI中需要特殊处理
• 注：
• 文件传输用到了（OMA CPM中定义的）MSRP
• 但是仅用于打电话期间的地理位置推送Geolocation Push

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