Multi-radio Multi-channel Wireless Mesh Research Articles

Distributed optimal congestion control and channel assignment in wireless mesh networks

Wireless mesh networks have numerous advantages in terms of connectivity as well as reliability. Traditionally the nodes in wireless mesh networks are equipped with single radio, but the limitations are lower throughput and limited use of the available wireless channel. In order to overcome this, the recent advances in wireless mesh networks are based on multi-channel multi-radio approach. Channel assignment is a technique that selects the best channel for a node or to the entire network just to increase the network capacity. To maximize the throughput and the capacity of the network, multiple channels with multiple radios were introduced in these networks. In the proposed system, algorithms are developed to improve throughput, minimise delay, reduce average energy consumption and increase the residual energy for multi radio multi-channel wireless mesh networks. In literature, the existing channel assignment algorithms fail to consider both interflow and intra flow interferences. The limitations are inaccurate bandwidth estimation, throughput degradation under heavy traffic and unwanted energy consumption during low traffic and increase in delay. In order to improve the performance of the network distributed optimal congestion control and channel assignment algorithm (DOCCA) is proposed. In this algorithm, if congestion is identified, the information is given to previous node. According to the congestion level, the node adjusts itself to minimise congestion.

A Wireless Mesh Network Channel Assignment Method Based on Potential Game

To solve multi-radio multichannel (MRMC) wireless Mesh network channel assignment problems, we propose and study the PGCA (channel assignment based on potential game) method. PGCA takes each link of the network as a player by designing rational potential function. The action strategies between links select resources containing channel and space information. PGCA converts maximum network throughput into minimum network interference by joint game. Simulation results show PGCA algorithm has better performance in terms of convergence speed and the network throughput. The end-to-end delay has connected with the number of links.

Channel Assignment Strategy for Multi-radio Virtual Hierarchical Wireless Mesh Networks

A virtual hierarchical wireless mesh network architecture is studied in this paper, which gains fine user diversity and routing stability. As each node inside a cell is equipped with multiple radios and multiple channels are available, an efficient channel assignment algorithm based on this multi-radio multi-channel virtual hierarchical wireless mesh network is proposed, which combines the channel pre-allocation algorithm with the time-slot multi-graph decomposition algorithm, so as to increase channel resource utilization and ensure the fairness of channel allocation. In the channel preallocation algorithm, a generalized set T-coloring model based on graph theory is utilized. Then, the time-slot multi-graph decomposition algorithm is conducted according to the channel pre-assignment, which exploits spatial reuse features of a multi-channel multi-radio system to optimize the network performance. The algorithm analysis and simulation results show that the proposed channel assignment strategy can improve the network performance effectively with lower complexity and achieve higher channel utilization.