 the information they exchange. The group has a system-wide view, and decides on how new functions integrate with the existing network entities. SA WG3 (Security) This group is responsible for the security of the 3GPP system, performing analyses of potential security threats to the system, considering the new threats introduced by the IP based services and systems, and setting the security requirements for the overall 3GPP system. SA WG4 (Codec) This group deals with the specifications for speech, audio, video, and multimedia codecs, in both circuit-switched and packet- switched environments. SA WG5 (Telecom Management) This group specifies the management framework and requirements for the management of the 3G system, delivering architecture descriptions of the telecommunication management network and coordinating across other working groups all work pertinent to the 3G system telecom management. Core Network and Terminals CT WG1 This group is responsible for the 3GPP specifications that define This group is responsible for the user equipment - core network Layer 3 radio protocols and specifying terminal interfaces, the core network side of the reference points. terminal capabilities, and the core CT WG3 network part of 3GPP systems. This group specifies the bearer capabilities for circuit- and packet-switched data services, the necessary interworking functions towards both, and the user equipment and terminal equipment in the external network. CT WG4 This group defines stage 2 and stage 3 aspects within the core network focusing on supplementary services, basic call processing, mobility management within the core network, bearer independent architecture, GPRS between network entities, transcoder free operation, etc. CT WG6 This group is responsible for the development and maintenance of specifications and associated test specifications for the 3GPP smart card applications, and the interface with the mobile terminal. "http://www.3gpp.org/Specification-Groups CHAPTER 1 Introduction to Mobile Broadband Wireless Acc