Supporting Quality of Service and Mobility Management of Media Casting over Wireless Networks
Date Issued
2006
Date
2006
Author(s)
Yang, He-Kai
DOI
zh-TW
Abstract
With the widely deployed wireless networks, people have another choice to access the Internet. Therefore, many applications originally provided on wired networks will be used over wireless environment, and multimedia services may be the most popular one in the near future.
Delivering multimedia content via multicast in our system saves unnecessary bandwidth wastage and uses limited wireless resource more efficiently. Besides, we compress video content through the adaptive mechanism─scalable video coding according to the video quality users need.
However, nodes in wireless networks move anytime and multimedia services may disconnect during handoff, mobility management issues must be considered when providing seamless services. Moreover, real-time applications are sensitive to delay and jitter, Quality of Service (QoS) guarantee need to be provided. We propose “pre-download” scheme in order to pre-construct multicast tree, then MN will not suffer from delay and could always get basic quality content during handoff. Besides, our most important contribution is to design “preemption” scheme. Through the flexibility provided by scalable video coding, we let handoff MN preempt others’ high quality enhancement layer (EL) stream to continually download basic quality content when system resource insufficient. Therefore, we not only favor handoff MN than new arrival one to keep handoff dropping probability low but also utilize the channel. In the end, we propose concept of Full quality Utilization (FU) on admission control unit to manage the resource adaptively.
We evaluate both our mobility management scheme and MAC mechanism used to provide QoS on AP (IEEE 802.11e MAC). In the simulation results, our scheme outperforms previous work favor handoff MN by bandwidth reservation on three important performance metrics : utilization、new blocking probability and handoff dropping probability.
Subjects
多點傳播
網際網路群組管理協定
可調性視訊編碼標準
多媒體
行動管理
服務品質保證
允入控制
802.11e
multicast
IGMP
scalable video coding
multimedia
mobility management
Quality of Service
admission control
Type
other
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