Comparative Radio Packet Scheduling Issues in cdma2000 1x and 1xEV Systems

摘要

Radio packet schedulers are currently being implemented in cdma2000 1x and 1xEV. cdma2000 1x stems from TIA/EIA-95 that was optimised to support circuit-based voice communications and is now extended to support high speed data transmission up to 153.6kbps. 1xEV is primarily for wireless Internet access and can support up to maximally 2.4 Mbps. Compared with other 3G mobile systems that focus on voice services and guaranteed quality of the services, 1xEV exploits the delay-tolerant transmission of the packet data services so as to achieve spectral efficiency and reduce the cost of providing such services. Supporting multimedia transfer including real-time as well as delay-tolerant data transmission, however, is a must in designing packet schedulers for future mobile systems. In this letter, we address design issues of a packet scheduler by comparing two existing different schedulers: WQDS (Weighted Queuing Rate Scheduler) for cdma2000 1x and PFRS (Proportional Fairness Rate Scheduler) for 1xEV. Comparisons are made on the structure of schedulers as well as by numerical evaluations of performance.