• Optimisation of 802.16m (WiMAX2) relay station for enhanced performance

      Ahmed, Naveed (University of Bedfordshire, 2012)
      The relay stations are widely used in major wireless technologies such as WiMAX (Worldwide Interoperability for Microwave Access) and LTE (Long term evolution) which provide cost effective service to the operators and end users. It is quite challenging to provide guaranteed Quality of Service (QoS) in WiMAX networks in cost effective manner. In this thesis the WiMAX RS (relay station) is investigated for the purpose of saving overall cost by decreasing the number of RS to cover the territory of base station and also to provide the services to mobile users out of the range of base station. Secondly, the throughput and delay matrices have been taken to enhance the system performance. In addition to cost effective deployment of RS and evaluation of throughput and delay using relay station, the third factor which is with comparison of QoS classes is also made in order to see the overall performance of WiMAX network. As a technical challenge, radio resource management, RS selection, and QoS parameters are also primarily considered. The main objective is to decrease the overall deployment cost in relay stations and utilize the available spectral resources as efficiently as possible to minimize the delay and improve throughput for end users with high demanding applications such as voice and video. Having in mind the cost and the increasingly more demanding applications with ever growing number of subscribers, main consideration of this thesis have set the parameters and contribute to the technology in cost effective way to improve QoS. Within the pool of scheduling algorithms and for the purpose of achieving efficient radio resource management, link adaptation methods, AMC scheme, cell sectoring and directional antenna have been studied in detail. Some of the IEEE802.16m standard parameters are not supported in current version of OPNET 16 due to new amendment and evolution of new techniques applied in WiMAX2.