Abstract
In this paper the IEEE 802.16 standard based Mobile WiMAX (Worldwide Interoperability for Microwave Access) system is investigated for the purpose of Quality of Service provisioning. As a potential solution, scheduling algorithms have been taken into major concern. Within the pool of scheduling algorithms and for the purpose Contention based bandwidth request resolution, the Modified Contention Based BW Resolution algorithm (MCB-BWR-Scheme) is proposed. Supported by the fact that the standard does not emphasize a specific scheduling algorithm for contention period based services, therefore, the choice of the scheduling algorithm for the WiMAX systems is very important. There are several scheduling algorithms for WiMAX in the literature, however, studies show that an efficient, fair and robust scheduling algorithm for WiMAX systems is still an open research area and hence a well thought out algorithm will be of great contribution to the area under investigation. Results from the OPNET Modeler simulation program show that the adjusted algorithm works well with delay and throughput constraints. It is also in consistent with the quality of service demands of the video and voice traffic.
Highlights
1.1 Worldwide Interoperability of Microwave Access (WiMAX)Broadband Wireless Access (BWA) has become the easiest way for wireless communication and a solution to rapid requirement of internet connection for data, voice and video service
In this paper a new theory of Inverse Transformation Method has been considered in order to generate request randomly
In literature survey it has been observed that not much attention has been paid towards this area till date
Summary
Broadband Wireless Access (BWA) has become the easiest way for wireless communication and a solution to rapid requirement of internet connection for data, voice and video service. If more than one station tries to transmit in the same TO, collision happens Since it is not practically possible for SSs to sense the UL channel to detect a collision, the SSs can only know of the success of their BW request transmission if they receive a response in the form of a BW grant in the subsequent frames. The collision resolution and avoidance regulation of 802.16 MAC requires each SS to wait a random number of TOs before attempting a transmission in the contention period. This number is called the random back-off number and is chosen from an interval of (0, CW − 1), in which CW is the contention window size and is initially
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