Wireless broadband networks (such as WiMAX) provide more bandwidth for video streaming applications. However, too many streaming services over WiMAX would lead to congestion in the wireless links. How to relax the traffic on WiMAX links and provide users with a better QoS of streaming services is a worthy studying problem. In this thesis, we propose packet replication and duplication mechanisms for video streaming with the same connection requests to decrease traffic load over WiMAX links. Besides, we propose admission control and low-priority dropping mechanisms for video streaming with different priority levels. We reject low-priority video requests to guarantee QoS for high-priority video streams. If the network is congested, we decrease the bit rate through statistically dropping the low-priority video packets, which consequently improves the quality of high-priority video streams.
A subscriber gateway is implemented on Linux platform to demonstrate the above-mentioned three mechanisms. In the implementations, we classified the video priority levels and developed a scheme to drop low-priority packets in a multimedia streaming server. Finally, from the experimental results, we have shown that our mechanisms can decrease the traffic load over WiMAX links and provide users with different levels of service quality in multimedia streaming.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0717108-120311 |
| Date | 17 July 2008 |
| Creators | Yang, Hui-fan |
| Contributors | Wei Kuang Lai, Ren-Hung Hwang, Cheng-Shong Wu, Ce-Kuen Shieh, Tsang-Ling Sheu |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0717108-120311 |
| Rights | campus_withheld, Copyright information available at source archive |
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