Authentication and roaming are two critical issues for the integration of heterogeneous networks, such as the integration of WLAN access networks and mobile cellular networks. Due to the strong points of mobile cellular networks, it is favorable to integrate the authentication mechanism ofWLAN access networks into that of mobile cellular networks. For GSM/GPRS networks, the subscriber identity ...

As deregulation, stew technologies, and new competitors open up the mobile telecommunications industry, churn prediction and management has become of great concern to mobile service providers: A mobile service provider wishing to retain its subscribers needs to be able to predict which of them may be at-risk of changing services and will make those subscribers the focus of customer retention ef...

To allow for wireless communications among a specific geographic area, base stations of communication network must be deployed to allow sufficient radio coverage to every mobile users. The base stations, successively, must be linked to a central hub called the MSC (mobile switching centre). The mobile switching centre allow connectivity among the PSTN (public switched telephone network) and the...

Streaming media distribution is a rapidly growing application. The increasing number of broadband internet subscribers, the growing market for smart in-home networks and the upcoming broadband mobile phone networks encourage this trend. In addition, the number of multimedia enabled mobile devices such as PDAs, smart embedded devices and notebooks is rapidly growing. MPEG-4 is one of the favorit...

Multimedia services such as streaming video and downloadable music are driving revenues and handset turnover in the 3G wireless world. The critical factor, as always, is the quality of the end-user experience. Users won't pay for premium services if the quality and functionality fall below their expectations. Extensive testing is the key to delivering high-quality services and devices. But mult...