Abstract:
This thesis considers the problem of channel reservation techniques for contention-based MAC protocols in wireless communication networks. Two important issues are addressed, i.e., prioritization mechanisms and misbehaviors. In the first part of this thesis, five new channel reservation techniques, designed to support two-class services, are proposed, namely FPT+MP, FPT+MLT, FPT+PCP, FPT+SCS, and FPT+HFF. QoS metric (γ ) is defined to illustrate the deficit of different priorities. To achieve the goal, the thesis finds a channel reservation technique that can satisfy the level of QoS requirement, i.e., γ while maximizing the bandwidth utilization. Numerical results show that the combined technique of FPT+MP and FPT+SCS is the most effective. In the second part, the problem of misbehaviors on an existing contention reservation protocol, known as CFP, is investigated. The misbehaviors cause some impacts on the system performance, especially to those well-behaved users. Three different misbehaving scenarios, referred to as CPP, CPP+MT and CPP+SRT, are examined. Accordingly, the mathematical formulations for CPP and CPP+SRT scenarios are derived in closed forms. Moreover, the problem of misbehaviors for the FPT is investigated by simulation. Misbehaving can change permission probability and shifted number of reservation slots. The simulation results show that in the system with more than one misbehaved user, no users gain any advantage regardless of misbehaving techniques being employed.