Optimal Frequency-time Allocation in Cognitive Radio Wireless Mesh Networks

AbstractThe open spectrum allocation scheme is an effective approach to provide enhanced-capacity, flexible and reliable wireless networks. However, due to interference and coexistence with primary users, new spectrum management and network coordination technologies are required. Wireless mesh networks (WMNs) are currently the key technologies for providing Internet access as well as effective networking services in local and metropolitan areas. However, because a large number of nodes are involved in wireless networks and there is limited bandwidth, traffic congestion limits performance. Dynamic spectrum access and cognitive radio (CR) are enabling technologies to solve performance degradation problems in WMNs. In this paper, we suggest a cross-layer optimization scheme for opportunistic spectrum and time sharing in CR-based WMNs. The problem was formulated using linear programming and solved by the simplex-II method. The flow optimization problem was first developed for grid topology and random topology...