Coverage Enhancement in TDD-OFDMA Downlink by Using Simple-Relays with Resource Allocation and Throughput Guarantee Scheduler(Wireless Communication Technologies)

概要

論文の詳細を見る
Simple-relay aided resource allocation (SRARA) schemes are incorporated with throughput guarantee scheduling (TGS) in IEEE802.16 type time division duplex-orthogonal frequency division multiple access (TDD-OFDMA) downlink in order to enhance service coverage, where the amount of resources at each relay is limited due to either its available power which is much smaller than base station (BS) power or the required overhead. The performance of SRARA schemes is evaluated with both proportional fair (PF) and TGS schedulers at 64kbps and 128kbps user throughput requirements when total RS power is set to 500mW or 1W. For SRARA with RSs of relatively lower power (500mW), schemes that put total power into only one subchannel offer larger coverage than when both subchnnels are used with equal power allocation, while the RS with evenly power-allocated two subchannels could provide larger coverage gain for a relatively higher power (1W). Depending upon the target throughputs it is shown which of the relay scheme or scheduler design would play more important role in improving coverage. In a lower target (64kbps), more improvement comes from relay scheme rather than scheduler design. For a relatively higher level (128kbps), it comes from scheduler design rather than relay due to the fact that simple relay can't help using strictly limited amount of resources.
2007-12-01