The TDD mode differs from the FDD mode in that both the uplink and the downlink use the same frequency carrier. There are 15 time slots in a radio frame that can be dynamically allocated between uplink and downlink directions. Thus the channel capacity of these links can be different which is very advantageous especially when people are downloading stuff on their mobiles. The chip rate of the normal TDD mode is also 3.84 Mcps, but there exists also a “narrowband” version of TDD known as TD-SCDMA. The carrier bandwidth of TD-SCDMA is 1.6 MHz and the chip rate 1.28 Mcps. TD-SCDMA has been proposed by China and potentially has a large market share in China if implemented.

FAQ explaining TDD and FDD mode

TD-SCDMA: the Solution for TDD bands - Siemens

WCDMA and TD-SCDMA: European 3G vs. Chinese 3G

Further Vision on TD-SCDMA Evolution - LIU Guangyi, ZHANG Jianhua, ZHANG Ping

Datang Mobile & TD-SCDMA

10/03/06 China Mobile Might Want TD-SCDMA - DEAD
09/03/06 Qualcomm's TD-SCDMA royalty plans carry more weight
06/03/06 Poised for a 3G takeoff
03/03/06 China gets 3G TD-SCDMA Video Phone from Samsung
24/02/06 China seeks 3G glory with TD-SCDMA standard
21/11/05 Do-or-die trial set for China's homegrown 3G
11/11/05 IPMobile Wins Japanese 3G License
20/06/05 T-Mobile plans for UMTS TDD
14/04/05 Woosh triples UMTS TDD order


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