Maximizing the Reverse Link Throughput for CDMA2000 1XEV-DO using Particle Swarm Optimization

摘要

The capacity demands to handle the new services re cently offered by the current cellular market, such as data transmissions, video streaming, and Internet access, have led to a new era of wireless technologies. cdma2000 stan dards are considered to be the solution for the ever-growing demand of high-speed wireless packet data transmission. cdma2000 1xEV-DO standard has a distributed rate control on the reverse link in which the mobile station determines the data rate of the next frame in response to a reverse ac tivity bit broadcast by the base station and a pre-speci?ed set of (up and down) probabilities. The set of probabilities speci?ed by the standard is independent of the number of active mobile stations. In this paper we show that changing this set of prob abilities based on the number of active mobile stations, which is known by the base station, would improve the re verse link throughput. In particular, we use use the parti cle swarm optimization technique to determine the optimal sets of probabilities that maximizes the system throughput while satisfying the rise over thermal constraints. We vali date our proposed approach by simulation. We also derive an analytical upper bound on the reverse link throughput and compare the throughput of the proposed approach with this bound.