On-line joint QoS routing and channel assignment in multi-channel multi-radio wireless mesh networks

Review of channel assignment approaches in multi-radio multi-channel wireless mesh network

“…However, this approach assumes that the global information such as traffic profile is given as input to the algorithm. On the other hand, the on-line approach has been developed to adapt to traffic change by ensuring path stability constraint [4,17,[25][26][27]68] or avoiding link congestion [37,38]. Such approaches utilize the routing information to predict the channel condition.…”

“…In [38], a joint routing and channel assignment named Joint QoS Routing and Channel Assignment (JQRCA) has been proposed to maintain the feasibility of path based on path throughput and capacity. The proposed protocol consists of routing algorithm which aims to find a set of k-hop paths and on-demand channel (re) assignment that maintains the established path adapted to the network behavior and feasible.…”

“…In [37,38], traffic-aware channel interference has been proposed based on the channel load where a channel with least traffic load is selected to resolve the congested links. In [37], each node monitors the traffic load of ongoing links.…”

“…Once the node detects that one of its ongoing links becomes congested, it resolves the congested link by switching its corresponding interfaces for both link's nodes to the least load channel. In [38], a central node monitors the feasibility of the established path. If the path is not feasible, at least there is one link is congested, the node determines the bottleneck links along the path and assigns them with the least load channels.…”

“…This metric indicates the global impact of a certain channel assignment. In [37,38], the available bandwidth channel selection metric is proposed for channel selection where the channel is assigned to the link based on the available bandwidth. The metric is calculated based on the total channel load and the physical link capacity.…”