| Ad hoc networks are autonomous systems composed of wireless nodes without fixed infrastructure. Each node auto-configures itself to serve as a router to forward packets originated from other nodes. The medium access control (MAC) protocol, which controls the way a node accesses the channel, is the key component for achieving an efficient network. In this thesis, we focus on two issues in the MAC layer: power efficiency for packet transmission and end-to-end fair bandwidth allocation. We first propose a power-efficient algorithm that can conserve energy, enhance system throughput, and interoperate with the standard IEEE 802.11 MAC protocol by using the minimum required transmission power for each packet transmission. In the second part, we present a two-phase algorithm to achieve the optimal bandwidth allocation strategies for end-to-end flows. Detailed analysis and simulation results show that both algorithms are able to achieve superior performances compared with the standard IEEE 802.11 MAC protocol. |
