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Dedicated physical control channel (DPCCH): The uplink DPCCH is used to carry control information consisting of pilot bits to support channel estimation for coherent detection, TPC commands, and some feedback information. Unlike the downlink case, the DPDCH and DPCCH are not time multiplexed; instead, they are fed into the I and Q inputs of a complex spreader. 3 HSDPA To meet the increasing demand for high data rates in multimedia services over networks supporting WCDMA, the Third Generation Partnership Project (3GPP) has released a new high-speed data transfer protocol named HSDPA [26–29].

Reverse supplemental channel (R-SCH) Used to support high data rates for RC3 and RC4. There can be zero to two channels. 18 Reverse power control subchannel IS-2000 reverse link pilot frame structure. current 3G operators in Japan and Korea as well as in the United States are already experiencing great success with their data services. KTK in Korea has reported that 34% of its ARPU was related to data usage for the third quarter of 2003, particularly after the deployment of 1xEV-DO. The 1xEV-DO standard [12–20] is optimized for wireless high-speed packet data services.

In link level performance, we are mainly concerned with a single link between a mobile station and the base station; this link is typically based on the physical layer structure of the air interface. The physical layer is the layer that carries the actual RF transmissions. On the other hand, in system level performance the impact of the upper layers and their interactions with the physical layer has to be taken into consideration. Functions performed by the upper layers include radio resource management, admission control, and so on.

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