Design of a QoS Mechanism Based on IEEE 802.16 WirelessMAN Standard
碩士 === 國立中興大學 === 資訊科學與工程學系 === 96 === The main purpose of IEEE 802.16 Standard is to create “Last Mile” infrastructure for wireless broadband access in a complicated metropolitan environment. It can supply network services that are equivalent to xDSL or T1/E1 leased lines to subscribers. The primar...
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| Format: | Others |
| Language: | zh-TW |
| Online Access: | http://ndltd.ncl.edu.tw/handle/25299934164531809008 |
| Summary: | 碩士 === 國立中興大學 === 資訊科學與工程學系 === 96 === The main purpose of IEEE 802.16 Standard is to create “Last Mile” infrastructure for wireless broadband access in a complicated metropolitan environment. It can supply network services that are equivalent to xDSL or T1/E1 leased lines to subscribers. The primary cost and constructional difficulty of IEEE 802.16 implementation are lower than traditional wired PSTN. This makes IEEE 802.16 an attractive standard for developing countries and areas affected by natural disasters like tsunami or earthquake. IEEE 802.16 becomes the most important standard of wireless standards in recent years. The standard provides a QoS specification for five service classes with different parameter sets. The QoS is maintained by classifying bandwidth request and priority parameters. However, the standard does not define how the bandwidth is allocated for these service classes.
The purpose of this thesis is to design a bandwidth allocating mechanism on a IEEE 802.16 basis. This mechanism attempts to meet the demands of bandwidth requests of five classes. We have implemented an uplink packet scheduling simulator to evaluate the performance of the proposed mechanism with varying environment settings. The simulation results have demonstrated that our proposed mechanism is capable of achieving efficient bandwidth utilization and fair bandwidth allocation among different priority classes as well.
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