WCDMA-HSDPA的问题分析及其改进方案

高速下行分组接入（HSDPA）方式理论上能在小区内利用一个载波给多个用户同时提供高速数据和语音业务，但显然此时要求提供的下行业务容量应比单独提供语音业务时更大。证明了HSDPA缺乏技术理论基础，同时提出了一种利用码分多址/时分多址的HSDPA改进方案，它将利用码分多址区分语音和高速数据业务信道，在高速数据业务信道中再选用时分多址方式。这种方法可改进WCDMA标准上下行容量基本对称的技术问题，使其符合移动因特网的需求。 

Analysis of problem and improved scheme for WCDMA-HSDPA

High speed downlink packages access (HSDPA) should provide high speed data and voice services for multi-users simultaneously by an single carrier in the cellular, and apparently, the required down link traffic capacity is much heavier than that for mere voice service. This paper proves that HSDPA is short of theoretical basis, and it introduces a meliorated HSDPA scheme by combining CDMA technique with TDMA, in which CDMA is used to distinguish voice and high speed data traffic channels. Furthermore, TDMA mode is employed in high speed data traffic channels. This method could improve the technical defect of the symmetric up/down link capacity for WCDMA standard to meet the requirement of wireless Internet service.