Application-Level QoS AND QoE Assessment of a Cross-Layer Packet Scheduling Scheme for Audio-Video Transmission over Error-Prone IEEE 802.11e HCCA Wireless LANs
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概要
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This paper proposes a cross-layer packet scheduling scheme for QoS support in audio-video transmission with IEEE 802.11e HCCA and assesses application-level QoS and QoE of the scheduling scheme under lossy channel conditions. In the proposed scheme, the access point (AP) basically allocates transmission opportunity (TXOP) for each station in a service interval (SI) like the reference scheduler of the IEEE 802.11e standard, which is referred to as the TGe scheme in this paper. In the proposed scheme, however, the AP calculates the number of MAC service data units (MSDUs) arrived in an SI, considering the inter-arrival time of audio samples and that of video frames, which are referred to as media units (MUs), at the application layer. The AP then gives additional TXOP duration in the SI to stations which had audio or video MAC protocol data units (MPDUs) in their source buffers at the end of the previous TXOP. In addition, utilizing video frame information from the application layer, we propose video frame skipping at the MAC-level of a source station. If a station fails to transmit a video MPDU, it drops all the following video MPDUs in the source buffer until the next intra-coded frame comes to the head of the buffer. We compare the reference scheduler (TGe scheme), the proposed packet scheduling scheme with and without the video frame skipping at the source in terms of application-level QoS and QoE. We discuss the effectiveness of the proposed packet scheduling scheme from a viewpoint of QoE as well as QoS. Numerical results reveal that the proposed packet scheduling scheme can achieve higher quality than the TGe scheme under lossy channel conditions. We also show that the proposed scheduling scheme can improve the QoS and QoE by using the video frame skipping at the source. Furthermore, we also examine the effect of SI on the QoS and QoE of the proposed packet scheduling scheme and obtain that the appropriate value of SI is equal to the inter-arrival time of video frame.
- 2010-06-01
著者
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Suzuki Takahiro
Faculty of Health Sciences, Department of Human Care Engineering, Nihon Fukushi University
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Tasaka Shuji
Department of Computer Science and Engineering, Graduate School of Engineering, Nagoya Institute of
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Tasaka Shuji
Nagoya Inst. Technol.
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Tasaka Shuji
Department Of Computer Science And Engineering Graduate School Of Engineering Nagoya Institute Of Te
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Bin Muhamad
Department Of Computer Science And Engineering Nagoya Institute Of Technology
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Tasaka Shuji
The Graduate School Of Engineering Nagoya Institute Of Technology
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Suzuki Takahiro
Faculty Of Health Sciences Nihon Fukushi University
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Suzuki Takahiro
Faculty Of Health Sciences Department Of Human Care Engineering Nihon Fukushi University
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