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11 High-speed DownlinkPacket AccessAntti Toskala, Harri Holma, Troels Kolding, Frank Frederiksenand Preben MogensenThis chapter presents High-speed Downlink Packet Access (HSDPA) for WCDMA thekey new feature included in Release 5 specifications. The HSDPA concept has beendesigned to increase packet data throughput by means of fast physical layer (L1) retrans-mission and transmission combining as well as fast link adaptation controlled by the NodeB (Base Transceiver Station (BTS)). This chapter is organised as follows: First, HSDPAkey aspects are presented and a comparison to Release 99 downlink packet access pos-sibilities is made. Next, the impact of HSDPA on the terminal uplink (user equipment(UE)) capability classes is summarised and an HSDPA performance analysis is presented,including a comparison to Release 99 packetdata capabilities.
280 WCDMA for UMTS service and packet data, the DCH capacity reserved is equal to the sum of the highest rate used for the AMR speech and the highest rate allowed to be sent simultaneously with full
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