With the dramatic development and expansion of 3G cellular networks all over the world, a profound evolution is taking place in the UMTS networks and continuing to unfold towards wider bandwidth, lower latency and packet-optimized radio access technology with highly improved peak data rate capability, in order to meet the rapidly growing demand for bandwidth and mobility of the global nomadic users. This chapter will give a brief introduction of the evolution of the UMTS standard, from its first release (Release 99) to the latest Release 8 (still being standardized). The purpose of this chapter is to provide background knowledge of the evolution of the UMTS to help understand the new requirements of the evolved UMTS radio access networks.
KeywordsUser Equipment Internet Protocol Asynchronous Transfer Mode Universal Mobile Telecommunication System Visitor Location Register
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