pplications (programming) interface from chapter 9 Device SyncML Location Bluetooth, IR management Messaging services Codec Codec SIP, SDP WWW/HTML IPv4, IPv6 OSPF, RIP, BGP Possibly IP Traffic classification, channet setup Header Terminal with QoS compression RFC 2507 TCP/IP from chapter 7 and compressed header/WAP from chapter 5 Link layer Transparent PDCP Non-transparent PDCP See also bearer networks in figure 10.12 and security MAC layer Speech channel Video channel Un-reliable data channel functions in figure 10.13 Reliable data channel Physical layer Figure 10.14 Example of terminal protocols. Operating system and execution environment are not incuded 10.11 THE FUTURE 'In the future computers will not only be increasingly mobile, but information will be accessible from any mobile position. Devices will recognize who we are and obtain information about us. There will be a mixture of interoperable fixed and mobile devices. A device will also be more aware of its user and more aware of its own environment. The terminal will be able to sense the presence of a user and calculate his/her current situation' (Wireless World Research Forum). Edge Nodes 11.1 INTRODUCTION 11.1.1 WHY A SEPARATE NODE-ORIENTED CHAPTER? Edge nodes/media gateways have developed into a key component in the new horizontal network in many types of networks embracing an impressing functionality capable of almost any type of conversion. They also operate at the payload level, with recoding capabilities. The media gateway constitutes a resource bank that is controlled by the media gateway control, for networks with such architecture. The typical position in the network is shown in Figure 11.1. Understanding media gateways and other similar edge nodes (CPN, Other network if any) Terminal Content Content Service network Appl.protocol, such Applications as HTTP Service enablers Access dependent SIP, H.323, BICC, ISUP signalling, or SIP, IW sign H.323 Gateway control protocol Access type 1 PNNI, OSPF, RIP Core connectivity Access type n Might be one