第二章有线网络CHAPTER 2 WIRED COMMUNICATION NETWORKS.pptx

第二章 下一代网络与MPLSChapter 2 Next Generation Network and MPLS;Main Contents;Main Contents;Main Contents;Background of NGN;;; Societal and Business trends Internet is becoming a major enabler of communications Consumers are embracing computing, mobile and digital technology in their everyday life Evolution of Business models require increased levels of personal mobility;Main Contents;Definition of NGN;Definition of NGN;Main Contents;Characteristics of NGN;Characteristics of NGN;Main Contents;Architecture Evolution;Architecture Evolution;Architecture Evolution;Architecture Evolution;Architecture Evolution;Architecture Evolution;The Players of NGN;Main Contents;3GPP Architecture of NGN with IMS;IMS is an open IP-based architecture using the Client-Server Network Computing model 3GPP originally specified IMS to enable real-time multimedia services over the IP bearer, in GSM and WCDMA networks. 3GPP2 specified the MMD architecture for CDMA2000 networks based on IMS. 3GPP2 requirements are part of Common IMS in IMS release 8. The xDSL access, specified by TISPAN, is integrated into IMS. The cable access specified by CableLabs in PacketCable 2.0 is part of IMS release 8. Interworking with WLAN was specified in IMS release 6, while the mobility with WiMAX has been addressed in EPC specifications. If IMS is not used: Multimedia communication at best effort Service roaming can be difficult to implement Provisioning and charging are service specific Compliance with LI requirements can be an issue;Main Contents;;NGN Architecture Principles;NGN Architecture Principles;;Common Components;Common Components;Common Components;;Transfer Functions;Transfer Functions;Transfer Functions;Transfer Functions;;RACS Functionality;RACS Functionality;RACS Architecture;RACS Architecture;RACS Architecture;RACS Architecture;;NASS Functionality;NASS Functionality;NASS Architecture;NASS Architecture;NASS Architecture;NASS Architecture;Service Layer;;IMS Architecture in NGN;NGN Impacts to IMS;I