Mobile AD-HOC And Sensor Network
A new concept of a hybrid ad-hoc network is presented. We illustrate two message exchanging functions which
employ External Connection Updating (ECU) and Internal Connection Updating (ICU) messages to establish and maintain
connections between stationary and mobile nodes. By avoiding repeated connection updates and unnecessary pilot message
channel monitoring, it is possible to reduce the amount of energy used due to receiving and transmitting these messages.
By exploiting the expected distance to the transmission fringe of a connected node, a method to delay connection updates is
derived as a probabilistic equation, depending on received SNR, confidence factor, and certain environmental attributes. The
result does not depend on MAC level protocol specifics, and the results scale with transmission distance and required SNR.
The confidence factor will govern how conservative the movements will be. Then, by exploiting the proximity of the mobile
node to the stationary node, the probabilistic equation derived for the suspension of pilot channel monitoring was shown to
be similar to the earlier result. We conclude that for scenarios where multiple connections are possible, these power control
schemes are able to avoid connection maintenance and formation whenever possible if reliable connections are present. The
benefits of using such schemes become more apparent as the frame length or the mobile node velocity is reduced.
Furthermore, as past signal measurement information is used, there is an improvement in energy efficiency at the slight cost
of increased error rate.