Modeling the performance of a wireless node in multihop ad-hoc networks

In this paper, we model a wireless node´s state transition using a Markov chain model in a multihop ad hoc network. To investigate how the metrics, such as transmit power, contention window size, and node density, affect a node´s performance with interference, our model takes into account the interfering nodes in the entire system. Most of the previous work either didn´t consider all the interfering nodes in the network or simply ignored interference. Based on a Markov chain model, we calculate a node´s throughput, consumed energy and delay time. From the numerical results, we conclude that: 1. transmit power, contention window size, and node density affects the network performance. 2. Throughput and energy can be optimized together, whereas optimizing delay time results in tradeoffs in throughput and consumed energy. 3. A high transmit power can not guarantee a low delay time.