Routing hysteresis impact on traffic adaptation
Publish date: 2006-01-01
Report number: FOI-R--2166--SE
Written in: English
The efficiency of multiple access (MAC) protocols is an essential issue in order to improve the capacity and service reliability of tactical mobile ad hoc networks. Traffic adaptivity in the MAC-layer is a way to increase the network throughput, i.e., bottleneck nodes in the network are assigned more channel resources than other nodes. Changes in resource requirements, due to the mobility must be communicated among the nodes in order to get a good traffic adaptivity. There is a risk that this rescheduling overhead, due to frequent route changes, will be too high to motivate the achieved throughput gain. Introducing a hysteresis threshold in the routing decision will reduce the route instability and thus also the rescheduling overhead at the expense of lower capacity on the routes. We introduce a measure of adaptation efficiency which we use to evaluate simulated networks of different sizes with fixed and variable link data rate. The networks have random mobility. We show that small threshold values improves the user throughput in these networks.