| Author | Gyawali, Samrat |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Information and Communications Technologies, School of Engineering and Technology
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| Publisher | Asian Institute of Technology |
| Abstract | Worldwide Interoperability of Microwave Access (WiMAX) is alluded to be one of the renowned broadband wireless technologies and is expected to foster as a viable surrogate to traditional wired broadband techniques. Being a burgeoning technology, WiMAX provides Quality of Service (QoS) that aids to support variety of real time and non-real time multimedia applications. The QoS framework ensures satisfactory transmission of multiclass traffic making it a suitable contender to nurture health networks, which generate traffic mix of different service classes. The guarantee of QoS for different flows is ascertained by scheduling algorithms that take account of the WiMAX QoS classes and service requirements. However, as the WiMAX standard does not define the mechanisms of QoS implementation and scheduling, they are left out for service and network providers to revel in the area. In this study, a novel two tier priority wise reserve based bandwidth allocation and scheduling technique is proposed in which the scheduler at base station (BS) ensures priority of the connections as well as their QoS requirements in bandwidth allocation for each service flow. Similarly, the scheduler at subscriber station (SS) provides flexible QoS support through class-wise scheduling to the different connections of the service classes. As QoS cannot account for the quality perceived by the end user, the study introduces and incorporates the Quality of Experience (QoE) metric in the bandwidth allocation and scheduling processes. To provide a dynamic bandwidth allocation scheme based on QoE, the QoE metric in terms of MOS is fed back from SS to BS to assess end user perception. According to the feedback, adaptive bandwidth allocation is done at BS such that connections with better experience are provided with higher portion of the bandwidth. Besides, QoE of end users is augmented by mapping the multiclass traffic mix from a single source into an equal priority queue such that the scheduling of all connection objects takes place sequentially. The performance of the system is evaluated in terms of throughput and delay, which depict that it is superior to the reference algorithms.
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| Year | 2013 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Information and Communication Technology (ICT) |
| Chairperson(s) | Ahmed, Kazi Mohiuddin ; |
| Examination Committee(s) | Poompat Saengudomlert ;Attaphongse Taparugssanagorn |
| Scholarship Donor(s) | AIT Fellowship |