Performance evaluation for the uplink packet scheduling schemes by latency variation in IEEE 802.16 systems

This paper is to compare the performance of uplink packet scheduling schemes by the variation of latency value in IEEE 802.16 systems. In order to compare the performance, we chosen 3 types of uplink packet scheduling schemes(UGS[IEEE 802.16 standard], S-1[reference 10], S-2[reference 12]). From these results, we know the fact that S-2 scheme increases the system capacity by about 100% more than in the UGS scheme and about 5–20% more than in the S-1 scheme. Also, S-2 scheme has effect to decrease average delay time, because an average scheduling interval is reduced in case of small ML value. This study is to execute the performance evaluation for the moving subscribers on service. In practical environment, however, both moving and stationary mobile station coexist. Therefore, the practical capacity should be optimized because the maximum throughput is decided by the proportion of moving and stationary device. This result can be used for calculating the system capacity in the base station in case of WMAX and for traffic engineering techniques in order to accommodate many subscribers per the base station.