OPTIMAL BANDWIDTH UTILIZATION IN WIRELESS TOKEN RING NETWORKS

ii iii PREFACE The Internet world is rapidly progressing from a wired era to a wireless era. New protocols are designed for this transition. Wireless Token Ring protocol (WTRP) is one such protocol that is based on a token scheme. Performance in WTRP is limited by the channel bandwidth as the channel is shared among many stations. Under normal operating conditions, MAC protocol must provide guarantees to achieve Quality of Service (QOS). To improve the performance of WTRP, three different improvements to the protocol are proposed. These are: 1) a token reverse mechanism; 2) a farthest-hop mechanism and finally 3) a secondary communication mechanism. Simulation results show that proposed approach uses the bandwidth effectively and minimizes the token rotation time. Furthermore, results show that this further reduces the message delay in each node and increases the number of messages passed