Abstract
AbstractPartially overlapped channels (POCs)-based design has been identified recently as an emerging technology to further eliminate interference and improve network capacity. However, there are only few studies of channel assignment algorithms for POCs. In this paper, we research on utilizing POCs to improve network capacity and propose a traffic-irrelevant channel assignment algorithm, which assigns channels for all links in the network while minimizing total network interference. Theoretical calculation approach is utilized to obtain the direct relationship between interference ranges and channel separations, which can be easily applied to mesh networks with various configurations without modification. As traffic between the Internet and clients is considered to be dominant, distance from the gateway, number of neighbors, and interference are used to determine the channel assignment order of links. Simulation results reveal that network throughput and end-to-end delay performance can be dramatically improved by fully exploiting POCs as well as orthogonal channels.
Highlights
Wireless mesh networks (WMNs), which can extend the coverage of current wireless networks, draw close attention from academic community and industry in recent years [1]
The following problems may exist in the above greedy partially overlapped channel assignment algorithm: (1) Interference ranges are obtained by field measurement; (2) When deciding channel assignment order, the algorithm gives higher priority to the link that has minimum expected interference with other links, but if there are several links whose expected interference values are equivalent, how to break the tie is still unknown; (3) If several channels all satisfy the minimum interference requirement, random channel selection may not yield good performance; and (4) The algorithm assumes that WMNs have dynamic traffic, that is, the connection demands have random sources, destinations, and arrival times, i.e., peer-to-peer traffic is dominant
Α, 0 < d(p, l) ≤ R (τ ) else where ir(p, l) denotes the channel interference ratio between links p and l; Al denotes set of links that have already been assigned a channel; R (τ ) denotes the reduced interference range observed on channel with a separation of τ, which can be obtained through theoretical calculation; d(p, l) denotes the distance between links p and l; and α is a constant used to quantify the interference degree between Partially overlapped channels (POCs) of different interfaces on the same node, which is usually set to a large value, say 10, to avoid the utilization of POCs on the same node as possible
Summary
Wireless mesh networks (WMNs), which can extend the coverage of current wireless networks, draw close attention from academic community and industry in recent years [1].
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