Link-availability Forecast in Highly Dynamic Manets

W.G. Gikaru and A. Schill (Germany)

Keywords

Zone mobility, safe distance, linkfailure/availability forecast.

Abstract

Throughput, Latency and bandwidth availability are very important metrics in Ad hoc Networks that are not easy to achieve, especially when the Ad-hoc Network is highly dynamic. Increase in mobility in an Ad hoc network is normally associated with increase in the number of communication packets in the network. It also means an increase in the chances of a link break/failure between nodes, resulting in inavailability of routes/paths to destinations. This greatly affects the throughput and increased delay of packet delivery. It is important to have knowledge of the life-time of a route to avoid delays involved in route discovery protocols [1]. To tackle these problems, we analyse the concepts of safe distance and link status in highly dynamic mobile networks and forecast link availability. This idea is important especially in field applications e.g. students attending conferences in groups, rescue personnel handling a disaster in groups i.e. a groups of medical personnel, fire fighters, policemen, engineers or technicians etc. who can move in groups (zones). In our scheme, we use neighbouring mobile nodes’ history and predict their current/future locations relative to a host node thus forecast link status through computation. This helps us determine when to communicate with the neighbours and know how safe it would be to transmit to them prior to confirming a route. We have particularly considered zone routing protocols as they are flexible due to their hybrid potentiality. Approaches have been suggested on how to determine link status [2],[5],[9], but issues of increase in network traffic due to higher mobility (and when to transmit them) needs more attention.

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