因為目前大家對於以無線的方式來傳輸資料愈來愈需要，而資料封包在傳輸過程中難免會遺失或延遲，如網路語音( VoIP )的封包很容易在傳輸過程中與其他資料封包爭取網路上有限的頻寬，因傳輸延遲造成品質不佳的後果，再加上視訊會議及影像傳輸的需求與日遽增，確保各種資料傳輸的服務品質( QoS )，為當前急需解決的課題之一。
因此，在 802.16a 通訊系統中，如何達到用戶服務品質的要求，是相關研究的一大重心。本篇論文中將針對 802.16a 所定義的 UGS、rtPS、nrtPS、BE 這四種資料型態，如何有效的傳送以滿足各 traffic 不同的需求特性，提出 QoS-based 允入控制分析模型，可以藉由我們的允入控制分析模型來調整系統內的服務品質要求。
最後，結合中央大學校園 IP Network 與 802.16a Base Station ( BS ) 及 Subscriber Station ( SS ) 設備，使用 NetIQ 所推出的 Qcheck 3.0 版模擬軟體，設定模擬參數來送出 UDP 、TCP 封包，其中 UDP Streaming 測試可以模擬出像是影像廣播等的串流應用狀況，像是 Voice-over IP 或是網路影音；而 Response Time 可以模擬出一般網路環境應用程式，透過 TCP、UDP 協定送出資料所需時間。透過這些應用服務，實驗測試網路服務品質的效能。

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