Analysis and Improvement in Power Control MAC Protocol for Ad Hoc Networks

10.6302/JITA.201106_5(2).0002

Ping Ding；JoAnne Holliday；Aslihan Celik

Ad Hoc networks ； Interference ； Honey grid model ； node state transitions ； Markov Chain model ； DEMAC ； energy efficient ； performance

Journal of Information Technology and Applications(資訊科技與應用期刊)

5卷2期（2011 / 06 / 01）

57 - 74

英文

Transmit Power Control (TPC) protocols have been proposed to address the limited power supplies in ad hoc networks. However, most of the previous work minimizes the transmit power without considering both the energy consumed in collisions and the energy disbursed to overcome the interference from all the interfering nodes in the network. We create a honey grid model to model the upper bound network interference, and then calculate the throughput and the consumed energy with such interference using a Markov Chain Model. From the numerical results, we conclude that the maximum throughput and the per frame minimum consumed energy occurs at an optimal transmit power which is sufficient to avoid the interference, and causes the least contention between nodes. Furthermore, we propose a novel per-frame-based TPC protocol, DEMAC (adaptive energy efficient MAC), in ad hoc networks using IEEE 802.11 with low PHY rate. To avoid interference, improve throughput, and save energy, DEMAC adaptively looks for the optimal transmit power based on the network interference and data payload. DEMAC is valid through simulations and outperforms several proposed TPC protocols.