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In cognitive multimedia mesh networks (CMMNs), unlicensed users (secondary users, SUs) can share the spectrum with licensed users (primary users, PUs) on a non-interfering basis. The main challenge in CMMN is how to implement an efficient optimal control policy that can allocate spectrum and transmission powers for the SUs efficiently and how to adapt these resources to the changing network conditions...
Next generation wireless networks will be heterogeneous, where several primary users (PU e.g. licensed users) and secondary users (SU e.g. unlicensed users) can operate in the same dynamic and reconfigurable networks at a given time. The major challenge in this heterogeneous radio environment is to enable the coexistence between PU and SU which will further improve the efficient use of radio spectrum...
Future wireless networks are evolving towards a heterogeneous cooperative and cognitive architecture to support broadband communication needs of different types of traffic. Future wireless networks will allocate network resources based on cooperative techniques. Resource controllers will apply the cognitive principle to find out status of various networks. We propose a predictive resource allocation...
The following topics are dealt with: wireless communications; wireless networks; networks convergence; social mobility; mobile technology; wireless technology; protocols; mobile network deployment; cognitive vehicular networks; cooperative networks; security; spectrum allocation; radio interfaces; traffic and congestion control; QoS; and resource management.
This paper proposes a spatial time-division multiple access (STDMA) based scheme (STBS) to enhance the system throughput in cognitive radio wireless networks. Especially, the proposed scheme is suitable for the situation when the available number of channels is far less than the number of secondary users (SUs). The system design includes: 1) a novel criterion based on SINR constraint (SC) to determine...
Today's wireless networks are characterized by a fixed spectrum assignment policy. However, a large portion of the assigned spectrum is utilized from 15% to 85% with a high variance in time. Cognitive radio can improved the spectrum efficient through dynamic spectrum access. In this paper, a scheme is proposed in which cognitive radio networks (CRN) collaborate with primary radio networks (PRN) to...
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