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TD-SCDMA, proposed by China Wireless Telecommunications Standard Group (CWTS), is the low chip rate (LCR) TDD CDMA proposal in 3G. The Internet services will generate highly asymmetric data flow. The aim of TD-SCDMA downlink packet access (HSDPA) is to provide very high packet throughput and low packet delay in the downlink using the newly introduced high speed downlink shared channel (HS-DSCH). This paper presents the methodology we used to model HSDPA for TD-SCDMA in OPNET.