Implementation and analytical modelling of modified optimised link state routing protocol for network lifetime improvement

Self-organising ad hoc networks need development of efficient routing protocols in terms of reliable routing and energy conservation. For dense ad hoc networks, optimised link state routing (OLSR) protocol is suitable owing to its multi-point relaying (MPR) feature. The authors have tried to make OLSR energy efficient by making effective neighbour selection based on residual battery energy of a node and traffic conditions that influence the drain rate of the node in the network. The authors have considered the multipath and source routing concept for route selection and a route recovery technique to tackle mobility issue efficiently. With these modifications the protocol becomes energy efficient and at the same time achieves balancing of network load. Simulation results of OLSR and the modified protocol OLSRM, show improvement in `Number of nodes alive` against variation in pause time, speed and node density. In this study, the authors have tried to model the network behaviour using R software. The work also describes analytical modelling of the protocol performance in terms of energy aware metric, `Number of nodes alive` with respect to simulation time as a common frame of reference. Using analytical modelling approach the authors can predict correct network behaviour for future instances.