| Summary: | 碩士 === 國立臺灣大學 === 電機工程學研究所 === 95 === Multi-hop wireless network, such as IEEE 802.11b WLAN, is one of the popular communication technologies. However, the wireless features such as media sharing, interference, channel contention and link-loss, bound the network performance and cause low aggregate throughput in network. In resent researches, there are three basic PHY/MAC mechanisms improving the network throughput, transmit rate control, transmit power control and spatial reused control. In this thesis, we addressed the problem that there are rare routing protocols take all of the interference, spatial reuse and transmit rate and power control into account in multi-hop wireless network.
We propose an iterative cross-layer routing algorithm which is combined with 1) the transmit power and rate control algorithm: TXPR, which adjusts the transmit rate and power based on the estimated SINR value for each link, 2) the distributed spatial reuse algorithm: DSRC, which adjust the physical carrier sensing threshold based on the link quality for each transmission, and 3) the new routing metric: SRIR which selects high performance routing paths with high channel access frequency and low interference level. And the simulation experiments also show that our cross-layer routing algorithm with SRIR metric has better network performance in aggregate throughput than existing wireless routing metrics.
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