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TD-SCDMA (Time Division Synchronous Code Division Multiple Access), a new standard for 3G mobile networks. TD-SCDMA covers all application scenarios. It is designed to address all sizes of cells - from rural areas to hot spots and indoor applications in busy city centers. Since TD-SCDMA is based on the TDD principle and uses unpaired frequency bands, it offers optimum efficiency for both symmetric and asymmetric data services. Due to its small bandwidth of 1.6 MHz this technology allows flexible allocation of the spectrum. The main challenge for 3G mobile systems is mastering both symmetric circuit switched services such as speech or video as well as increasing asymmetric packet switched services such as mobile Internet access. In answer to this challenge, TD-SCDMA combines two leading technologies: designed as an advanced TDMA/TDD system with an adaptive CDMA component operating in synchronous mode, TD-SCDMA is well suited for all 3G applications.
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