Performance evaluation of a modified RACE R2084 ATDMA access system

• Main Author: Chen, Lewis Wai Man
• Format: Others
• Language: English
• Published: 2009
• Online Access: http://hdl.handle.net/2429/7832

The telecommunications industry is experiencing an unprecedented demand for mobile communication services. It is expected that mobile subsribers will increasingly use multimedia services such as data, voice, and video applications. In this thesis, we study the access mechanism (medium access control (MAC) protocol and bandwidth allocation strategy) used in the RACE R2084 Advanced Time Division Multiple Access (ATDMA) system which focuses on the development of a third generation cellular system known as the Universal Mobile Telecommunication System (UMTS). In particular, we propose improvements to the ATDMA access mechanism which allow the base station to dynamically assign bandwidth to voice and video services based on their activity levels. The performance of the modified access mechanism is evaluated using the access delay and packet dropping probability experienced by the voice and video services under varying traffic-load conditions. For video service, it is shown that the modified access mechanism can increase the ATDMA system capacity by as much as 45% when compared to the original access mechanism. In supporting voice and video traffic simultaneously, simulation results show that the modified access mechanism can increase the system capacity, in general, while satisfying the QoS requirements for both voice and video services. === Applied Science, Faculty of === Electrical and Computer Engineering, Department of === Graduate