An Overview of High-speed Packet Data Transport in CDMA Systems

摘要

Rapid growth of data services in wireless communication systems requires an efficient means for high speed data transport. Modern CDMA systems have evolved to support this need. This paper presents an overview of the key techniques for improving high speed data transport in the following standards: 1xEV-DO (IS-856 Rev A), 1xEV-DV (cdma2000 Rev D), and HSDPA & EUL (WCDMA FDD Release 6). The emphasis is on identifying the common themes for high speed data transport in all these systems: adaptive modulation and coding, incremental redundancy and hybrid ARQ, smart scheduling to exploit channel variations, limited downlink macro-diversity aided by fast sector switching, and the use of shared channels to improve perceived latency.