| Summary: | 碩士 === 國立中央大學 === 資訊工程研究所 === 94 === MAC layer power-saving (PS) protocols for IEEE 802.11-based MANETs can be classified into two types: synchronous and asynchronous ones. IEEE 802.11 standard proposes a synchronous PS protocol for single-hop MANETs. The protocol needs accurate clock synchronization and is not suitable for multi-hop MANETs. On the contrary, an asynchronous PS protocol needs no synchronized clocks and is suitable for multi-hop MANETs. However, it usually consumes more energy than the synchronous one. In this thesis, a hybrid PS protocol is proposed, which combines the advantages of the synchronous and the asynchronous PS protocols for IEEE 802.11 multi-hop MANETs. The protocol utilizes the concept of dual-channel and dual-transmission-range clustering. It divides all the hosts into clusters. Each cluster has a head and all the heads are organized as a virtual backbone to route data. The synchronous PS protocol is operated in an individual cluster, and the asynchronous PS protocol is operated among cluster heads. Simulation results demonstrate that the proposed protocol is more scalable and more power-efficient than related protocols.
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