Performance of resource allocation schemes in adaptively modulated TDMA network

In this paper we investigate performance of resource allocation schemes in WLANs of metropolitan area using HiperLAN type 2 standard. Inside the WLANs user moves from one place to another and user rates are dynamically adjusted based on its distance from the access point. To manage the wireless resources of the network we propose resource allocation schemes and evaluate their performance. We develop a generic simulation software for the network and use it for three resource allocation policies namely minimum overhead round robin (MORR), which does not depend on user's buffer condition, weighted minimum overhead round robin (WMORR) which is a function of user buffer as well as the waiting time for transmission opportunity and weighted round robin (WRR) which is a function of user buffer only. For performance comparison we evaluate average and variance of number of packets in the user buffer, user buffer overflow and overhead in the uplink phase. Our results show that the second adaptive resource allocation technique i.e., WMORR outperforms the other two.