由於無線傳輸可使用的頻寬有限，如何在有限的頻寬資源下，使系統達到較高的流通量以支援最多的使用者是一個重要的研究課題。本論文提出一個具跨層級的子載波變換機制，同時設計排程與子載波之變換。希望為每個使用者選擇適當的子載波以組成合宜的子通道，進而增加系統的流通量，另外，由於同時考量服務流的排程，我們可以為各種不同的服務流，提供不同的QoS(Quality of Service)保證。藉由媒體存取控制(MAC)層與實體(PHY)層資料的交換，在子載波變換時將MAC層的用戶資料離開率加入考量以改善系統公平性，而在排程時將PHY層用戶通道狀況加入考量以改善系統流通量。
模擬結果顯示，系統在傳輸之流通量達到飽和時，跨層成比例公平子載波變換方法比IEEE 802.16e所規範的PUSC(Partial Usage of Subchannels)模式增加了28%的流通量。而在使用者容量上，跨層成比例公平子載波變換方法比IEEE 802.16e所規範的PUSC模式多出17%的使用者數量。此外跨層成比例公平子載波變換方法在不同服務流的模擬中，有較低的延遲時間，且在不同使用者間擁有長程公平性。藉由以上之模擬結果，驗證我們所提出之跨層成比例公平子載波變換方法能夠在滿足資料流QoS需求的同時提高系統的流通量及使用者數目。

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