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1 引言HSDPA 的标准主要是由3GPP 组织制定的,用于在WCDMA 系统的下行链路中提供基于分组的数据业务,其数据传输速率可达10 Mbit/s,使用的是5 MHz 的信道带宽。它引入了一种全新的信道类型(高速下行链路共享信道),这种信道能够有效利用无线频率资源,并充分考虑到猝发分组数据的传输需求。这种传输信道在若干个用户之间共享多址码、传输功率和基础设施硬件。无线网络资源能够被有效利用来为用户访问猝发数据提供服务。用户可以通过时分
1 Introduction The HSDPA standard is primarily developed by the 3GPP organization to provide packet-based data services in the downlink of WCDMA systems with data rates up to 10 Mbit / s using a 5 MHz channel bandwidth. It introduces a new type of channel (High Speed Downlink Shared Channel) that efficiently utilizes wireless frequency resources and takes full account of burst packet data transmission requirements. This transport channel shares multiple access codes, transmit power, and infrastructure hardware among several users. Wireless network resources can be effectively utilized to provide users with access to burst data. Users can pass hours