Priority and delay aware packet management framework for real-time video transport over 802.11e WLANs

Priority and delay aware packet management framework for real-time video transport over 802.11e WLANs
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用于通过 802.11e WLAN 进行实时视频传输的优先级和延迟感知数据包管理框架

DOI:
10.1007/s11042-012-1131-z
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发表时间:
2014-04
期刊:
Multimedia Tools Applications
影响因子:
--
通讯作者:
Guizhong Liu
Guizhong Liu
中科院分区:
其他
文献类型:
--
作者:
Haidong Wang;Guizhong Liu

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刚性时延约束是无线网络实时视频传输中最具挑战性的问题之一。过期的视频分组将变得对于解码和显示无用,即使它们在接收器处被正确地接收。由于每个视频数据包的重要性不同,因此在实时视频应用中,调度者不仅要考虑数据包的紧急性,还要考虑数据包的重要性。然而,现有的基于QoS的IEEE 802.11e MAC协议离开的紧迫性和视频数据包的重要性的考虑。本文提出了一种优先级和延迟感知分组管理框架(PDA-PMF),以提高IEEE 802.11e无线局域网上实时视频流的传输质量。在MAC层,该框架估计每个视频分组的延迟。随后,根据视频分组的重要性和延迟的估计值两者来发送或丢弃视频分组。仿真结果表明,该方案不仅可以减少丢包率,而且可以保护较重要的视频数据包,从而有效地提高了接收视频的质量。
The rigid delay constraint is one of the most challenging issues in real-time video delivery over wireless networks. The expired video packets will become useless for the decoding and display even if they are received correctly at the receiver. Because the significance of each video packet is different, the schedulers have to take into account not only the urgency of the packet but also its importance in the real-time video applications. However, the existing QoS-based IEEE 802.11e MAC protocol leaves the urgency and the importance of video packets out of consideration. This paper proposes a Priority and Delay Aware Packet Management Framework (PDA-PMF) to improve the transmission quality of real-time video streaming over IEEE 802.11e WLANs. In the MAC layer, this framework estimates the delay of each video packet. Subsequently, video packets are sent or dropped according to both the significance of the video packets and the estimation value of the delay. Simulation results show that the proposed scheme can not only reduce the packet losses, but also protect the more important video packets, so as to improve the received video quality effectively.
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