Performance analysis of a developed admission control model in mobile ad-hoc network (MANET)

As wireless mobile network becomes widespread, the demand for user applications is higher and the services provided by the wired application is expected to be available in the wireless medium. Therefore, the users of these applications will expect the same Quality of Service (QoS) as obtained in wired network. Providing a reliable QoS in wireless medium, especially MANET, is quite challenging and remains an ongoing research trend. The key issue of MANET is its inability to accurately predict the needed resources, to avoid interference with an ongoing traffic flow. An essential solution to the issues posed by MANET is the introduction of an admission control component for a guaranteed QoS. Admission control helps to control the usage of resources when an additional service is requested. For an admission decision to be made for a new flow, the expected bandwidth consumption must be correctly predicted prior to admission not-withstanding the fact that wireless medium is shared, and nodes contends among themselves to access the medium. Some recent solutions considered the MAC layer back-off impact due to collision as well as the non-synchronization of the sender and receiver during the available bandwidth estimation process. This thesis therefore has three (3) objectives. Firstly, it investigates the various techniques for estimating bandwidth in MANET that gives better accuracy. Secondly, this thesis develops an efficient bandwidth estimation and admission control mechanism that limits the frequent bandwidth usage for achieving lesser network overhead during the retrieval of neighbouring bandwidth. Finally, this thesis investigates the key metrics necessary to be considered to ensure a guaranteed control of admission within the network. The novelty of this thesis is the proposed resource allocation and admission control in MANET (RAACM) solution which is an admission control scheme that estimates the available bandwidth needed within a network using a robust and accurate resource estimation technique. Furthermore, the various factors that must be considered for an effective estimation were highlighted and simulations were carried out using Riverbed 17.5. Results obtained from the simulation, studies and compared the throughput impact of a network that has no admission control implementation with our proposed RAACM protocol. RAACM throughput result shows accuracy in its result with less data drop. The throughput result obtained from RAACM was thereafter compared with other state-of-the art admission control protocol. RAACM’s admission control throughput analysis performance with respect to the HCF is high when compared with closely related research work. RAACM’s delay and data dropped analysis was also studied and comparison was made with the state-of-the art admission control protocols, RAACM however, provides efficiency and accuracy in its result. In conclusion, by giving a close attention to the channel idle time estimation between a sender and a receiver for available bandwidth estimation through analysing it with respect to overlapping and non-overlapping period as well as dependant node distribution, network accuracy and efficiency have been realised in this thesis.