A New Multi-Channel Mesh Architecture with DCF-Based Inter-AP Communication and Radio-Aware Packet Forwarding for IEEE802.11-Compliant WLANs(Terrestrial Radio Communications)

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The mesh topology based on the standard IEEE802.11 for wireless LANs (WLANs) appears to be a very promising architecture on the way to realizing an ubiquitous high-speed wireless Internet access in the future. However, the current IEEE802.11 protocol is aimed at single Access Point (AP) environments and many problems related to the wireless meshed interconnection of APs and Mobile Terminals (MTs) remain unsolved. Some proposed solutions to build such mesh architectures are based on ad-hoc-oriented single-channel schemes that modify IEEE802.11 protocol. The main problem with this type of schemes, however, lies in the very low performance of the single-channel architecture itself when the network becomes larger or the offered traffic load increases. The task group IEEE802.11s is currently discussing and working out a standard for IEEE802.11-compliant mesh architectures for various usage scenarios including residential, office and campus/community/public access network but much work is ahead since the group was recently established. In this paper we propose a new multi-radio multi-channel mesh architecture for WLAN hot spots, which works using a Distributed Coordination Function (DCF)-based technique for interconnecting APs, and also a radio-aware packet forwarding scheme among APs. A major advantage of the system is that, putting routing issues aside, it introduces no changes into the MAC protocol of IEEE802.11. The simulation results obtained in OPNET v.10.0 show the great potential of our mesh architecture to support real-time traffic with any packet size, and the effectiveness of the radio-aware forwarding scheme in improving the delay performance of the mesh network.
社団法人電子情報通信学会の論文
2007-01-01

A New Multi-Channel Mesh Architecture with DCF-Based Inter-AP Communication and Radio-Aware Packet Forwarding for IEEE802.11-Compliant WLANs(Terrestrial Radio Communications)

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