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UBC Theses and Dissertations

A novel scheduling algorithm for video flows in high-rate WPANs Moradi, Shahab


The emerging high-rate wireless personal area network (WPAN) technology is capable of supporting high-speed and high-quality real-time multimedia applications. In particular, video streams are deemed to be a widespread traffic type, and require quality of service (QoS) support. However, in the current IEEE 802.15.3 standard for MAC (media access control) of high-rate WPANs, the implementation details of some key issues such as scheduling and QoS provisioning have not been addressed. Moreover, the hierarchical structure of video streams calls for special measures at the MAC layer in order to improve the QoS. In the first part of this thesis, we propose a frame-decodability aware (FDA) technique to make the scheduling algorithms aware of the hierarchical structure and decoding dependencies in video streams. Simulation results show that the FDA technique can significantly improve the performance of F-SRPT [1] and EDD+SRPT [2] schedulers by up to 61% and 60%, respectively. We also compare two common performance metrics and investigate which one is a more accurate indicator of the QoS given to video streams. In the second part of this thesis, we first propose a mathematical model for the optimal scheduling scheme for video flows in high-rate WPANs. Using this model, we then propose a scheduler that incorporates reinforcement learning (RL). Simulation results show that our proposed scheduler is nearly optimal and performs 42%, 49%, and 53% better than EDD+SRPT [2], PAP [3], and F-SRPT [1] schedulers, respectively.

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