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Adaptive end-to-end QoS for multimedia over heterogeneous wireless networks

机译：异构无线网络上多媒体的自适应端到端QoS

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摘要

There has been a surge of interest for multimedia applications over wireless networks in recent years. A colossal number of ways have been proposed to decrease delay, delay jitter and loss in wireless networks and good user-perceived quality in video over Internet. This paper studies the multimedia over heterogeneous wireless networks, requirements and problems, and proposes a new scheme to overcome the obstacles. The proposed scheme, takes into account the effects of Application-Level Wireless Multilevel ECN marking (AWMECN), thus helps us overcome the congestion/loss mistake problems. For handoff, handover and lossy link problems, it is considered that a freezing mechanism is in use in application layer and assumed that the upper layers can be aware of disconnection periods to make the rate adaptation decisions. Also a new scheme has been added to receiver to gracefully degrade the quality when no other action is available to combat the long delays without data which is caused by handoffs and wireless temporary disconnections. The transport layer mechanism is chosen to be UDP for avoiding TCP regarding problems. We believe that obtaining a good quality of video depends on good performance of all layers and tried to use the best mechanism in each layer.
机译：近年来，对通过无线网络的多媒体应用的兴趣激增。已经提出了许多种方法来减少无线网络中的延迟，延迟抖动和损失以及互联网上视频中用户良好的感知质量。本文研究了异构无线网络上的多媒体技术，需求和问题，并提出了克服障碍的新方案。该方案考虑了应用级无线多级ECN标记（AWMECN）的影响，从而帮助我们克服了拥塞/丢失错误的问题。对于越区切换，越区切换和有损链路问题，可以考虑在应用层中使用冻结机制，并假设上层可以知道断开时间段，从而做出速率调整决策。当没有其他动作可用于应对由于切换和无线临时断开而导致的无数据的长时延时，还向接收器添加了新的方案，以适度降低质量。选择传输层机制为UDP，以避免出现TCP相关问题。我们认为，获得高质量的视频取决于所有层的良好性能，并尝试在每个层中使用最佳机制。

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