This comparison was conducted towards investigating the optimum exploitation of such routing protocols in MANETs, in terms of their performance against the number of the nodes in the network.Ĭognitive radio (CR) bands following an interference-free opportunistic manner. In this context, this paper elaborates on a preliminary comparison study among different reactive protocols, such as the Ad hoc On-demand Distance Vector (AODV) and the Dynamic Source Routing (DSR). In addition, the routing protocols that are usually exploited in MANETs are characterized as proactive (Table-driven) and reactive (On-demand). Nodes failures and absence of centralized coordinators are also important challenges in such network configurations. Routing mechanisms in MANETs are considered as a major research challenge due to the nature of the network topology, where the nodes are able to move in any direction in the network showing unpredictable behavior. Mobile Ad hoc Networks (MANETs) are self-organized infrastructure-less networks, including wireless mobile systems, which have been thoroughly studied and widely used in a variety of applications. The simulations evaluate the performance of the algorithms in terms of energy consumption levels, the spectrum broker benefit, the end-to-end latency and the throughput response. The validity of the two energy-efficient algorithms is tested via several simulations, carried out under controlled conditions. The proposed approach follows a real-time spectrum trading scheme based on either a fixed-price or a combinatorial auction-based method, depending on the requirements for spectrum by the secondary systems. This is one strand of TVWS administration, while the chapter does not cover other use-cases for the exploitation of this spectrum part by microphone users or Wireless Internet Service Providers (WISPs). In this framework, this chapter is mainly focused on the effective use of TVWS as a part of the mobile operators' spectrum portfolio. The resource management can facilitate different mixes according to alternative context and needs. TVWS can be a mixed economy with licence-exempt use, or light-licensed or licensed approaches. Two optimisation algorithms are provided that enable the efficient use of TV White Spaces (TVWS) through a broker entity that coordinates the spectrum trading process among a number of wireless secondary systems. This chapter elaborates on radio resource management issues for an optimum frequency portion exploitation and maximum energy conservation in a centralised cognitive radio network architecture. Experimental tests that were carried-out under controlled conditions environment, verified the validity of the proposed framework, besides identifying fields for further research. This auction-based algorithm considers both frequency and time domain during TVWS allocation process which is defined as an optimization problem, where maximum payoff of Spectrum Broker is the optimization goal. Efficient RRM framework performance, as a matter of maximum-possible resources utilization and benefit of Spectrum Broker, is achieved by proposing, implementing and evaluating an auction-based algorithm. The proposed RRM framework is applied in a centralised Cognitive Radio (CR) network architecture, where exploitation of the available TVWS by Secondary Systems is orchestrated via a Spectrum Broker. This paper elaborates on the design, implementation and performance evaluation of a prototype Radio Resource Management (RRM) framework for opportunistic TV white spaces (TVWS) exploitation, under an auction-based approach.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |