Title: Effect of relay nodes and transmit power on end-to-end delay in multi-hop wireless ad hoc networks
Authors: Raja Vara Prasad Yerra; P. Rajalakshmi
Addresses: Research Lab, Electrical Engineering Department, IIT Hyderabad, Yeddumailaram, ODF Estate, Medak District-502205, Andhra Pradesh state, India ' Research Lab, Electrical Engineering Department, IIT Hyderabad, Yeddumailaram, ODF Estate, Medak District-502205, Andhra Pradesh state, India
Abstract: Channel access delay in a wireless multi-hop ad hoc network is the major source of delay while considering end-to-end delay. In this work, end-to-end delay is analysed considering silent relay nodes and effect of network parameters like node density and throughput. Given network parameter requirements and bound on end-to-end delay, optimal ranges of transmission radius and channel access probability can be obtained from the proposed analysis. Effect of silent relay nodes must be considered to maintain quality of service (QoS) metrics. Transmission power adaptability to reduce end-to-end delay is analysed considering the interference model. Increase in transmission power is not reducing end-to-end delay linearly. Simulation results show that increase in end-to-end delay due to channel access probability and throughput is onsiderably higher than node density. Also given the network parameters, end-to-end delay can be minimised only up to certain value irrespective of increase in transmit power.
Keywords: silent relay nodes; channel access probability; node density; end-to-end delay; interference modelling; ad hoc networks; multi-hop networks; wireless networks; quality of service; QoS; transmission power adaptability.
International Journal of Space-Based and Situated Computing, 2014 Vol.4 No.1, pp.26 - 38
Received: 15 Jul 2013
Accepted: 15 Dec 2013
Published online: 25 Apr 2014 *