Interference in Wireless Multi-hop Ad-hoc Networks
Ramin Hekmat, Piet Van Mieghem · 2002
In this paper we propose a new model to calculate interference levels in wireless multi-hop ad-hoc networks. This model computes the expected value of Carrier to Interference ratio (C/I) by taking into account the number of nodes, density of nodes, radio propagation aspects, multi-hop characteristics of the network, and the amount of relay traffic. Our model uses a regular lattice for possible locations of mobile nodes. This enables us to calculate the expected values of C/I , without having detailed information about movement patterns and exact location of all nodes at any moment. Based on this model we have evaluated effects of variations in the network size, network density and traffic load on C/I , and consequently throughput of the network. Our calculations suggest that interference is upper-bounded in wireless ad-hoc networks that use carrier sensing for medium access. Further, our calculations indicate that in large networks traffic increase due to routing overhead does not have a significant impact on network throughput.