Mobile ad hoc network energy strategy
|School||Central South University|
|Course||Communication and Information System|
|Keywords||Ad Hoc network transmission delay 802.11PSM power management|
With the development of wireless communication and Internet, the demand for mobile information services is growing gradually. Anybody, at any time and any location need to get access to information and contact with others. Ad Hoc networks, due to its ability of self-orgnization and self-repairing, is becoming a strong competitor of the next generation wireless networks. To increase the energy efficiency is the most important aim of designing wireless network protocols. The energy saving mechanism at MAC is one of the important approaches of improving energy efficiency of wireless networks.This paper firstly summarized the recent research profile of Ad Hoc networks, introduced the problems of increasing energy efficiency, compared and analyzed different approaches of energy saving at MAC, and indicated the direction of future work, then described thoroughly the principles of energy saving mechanism at MAC.This work presented a new energy saving approach-802.11EPSM when the data load was not heavy, based on deep research of 802.11PSM. 802.11EPSM improves PSM model, which could only send one package in one BI, by sending as many packages as possible in one BI through the information exchanging of ATIM frame, and at the same timedramatically reduces transfer delay, and prolongs the life span of central nodes to save energy using central nodes alternant wake-up. The results of simulation shows that EPSM has better performance than PSM in terms of decreasing transportation delays, saving energy, and prolonging life span of nodes, and has low rate of producing BI data packets, and energy efficiency is more than 30% higher than 802.11PSM when the data packets transit through many interim nodes.