WCDMA和TD-SCDMA中HSDPA的比较

高速下行分组接入(HSDPA)技术是针对第三代移动通信系统上、下行链路业务量不平衡的特点提出的,能够大幅提高下行传输速率。在R5版本中WCDMA和TD-SCDMA分别引入了HSDPA。两系统中的HSDPA技术在MAC层、物理层和技术上有一致性,但同时二者在物理层信令参数、物理信道种类、时隙调整、技术和整体性能上存在着一些差异,而差异的产生源于WCDMA和TD-SCDMA系统本身特点的不同。主要阐述了WCDMA和TD-SCDMA HSDPA的异同,并进行分析。

Comparison of HSDPA in WCDMA and in TD-SCDMA

High Speed Down-link Packet Access(HSDPA), which can highly increase the downlink data rate is presented for the unsymmetrical service of uplink and downlink in the 3rd generation mobile communication system. In R5, HSDPA was adopted in both WCDMA and TD-SCDMA systems. WCDMA HSDPA and TD-SCDMA HSDPA have some differences in the parameters of physical layer, the types of physical channels, the adjustment of time slots, techniques and the capabilities on the whole, while sameness exist in some aspects such as MAC layer, physical layer and techniques. And the differences are resulted from the differences in WCDMA and TD-SCDMA systems. This paper details the sameness and differences between WCDMA HSDPA and TD-SCDMA HSDPA, and then makes some analysis.