Real-Life Multi-Hop Multi-Radio Multi-Channel Wireless Mesh Network Experiments: 802.11n Is Not Any Better Than 802.11a!
Wireless Mesh Network (WMN) has become a popular access network architecture in the community due to its low cost and readily deployable nature. However, it is well known that multi-hop transmission in WMN is vulnerable to bandwidth degradation, primarily due to contention and radio interference. A straightforward solution to this problem is to use mesh nodes with multiple radios and channels. In this paper, the authors demonstrate through real-world experiments that the use of multiple radios and channels solely cannot solve the multi-hop TCP throughput degradation problem in IEEE 802.11n mesh networks.