Available bandwidth measurement based on NAV in Ad Hoc network
YI Yun-hui · Systems engineering and electronics · 2007
A new definition of available bandwidth in Ad Hoc network to reflect the collision and contention between nodes is given.The investigated node obtains the NAV information of its neighbors within the measurement duration through CSMA/CA mechanism and stores the information into its routing buffers.To the node sending several packets during a single measurement duration,the sum of NAV values can be computed.The available bandwidth of the investigated node is obtained by calculating the ratio of its channel accessible time to the measurement duration,which should subtract the sum of NAV values of its neighbors and the backoff time itself from the measurement duration.Simulation shows the proposed scheme is accurate and can completely reflect the collision and contention between nodes.