| Summary: | 碩士 === 國立中央大學 === 通訊工程研究所 === 97 === The Scalable Video Coding (SVC) is extended from the H.264/AVC video coding standard. It is very suitable for deployed on diverse access networks because of its network-friendly nature. Besides, by means of the spatial, temporal and quality scalabilities of SVC, a terminal station would receive the best suitable combination of these layer representations according to the radio channel condition and the capacity of the specific terminal station dynamically.
Under the concept of layer-separation of the OSI layer model, however, existing access network techniques would be upper layer unaware, that is, the PHY and MAC layer could not recognize the importance of dependency implied to each NAL Unit in decoding process. Thus, while the traffic loading in the access network becomes heavy, the video quality would degrade dramatically due to the upper layer-unaware nature of the existing systems.
Here, we propose a cross multi-layer mechanism to let the MAC layer of a IEEE 802.16e network system become aware to the importance of decoding dependency of each NAL Unit and make a suitable decision to the corresponding resource allocation. According to the simulation results, it is obvious that the video quality would be improved significantly.
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