在無線非同步傳輸模式網路的環境中，如何設計一個適當的媒介擷取控制通訊協定是很重要的。在這篇論文中，我們設計了一個具有高效能的媒介擷取控制通訊協定，可以根據不同的訊務類別來分配時槽並提供服務品質保證。
同時，考慮到無線頻道是一個易於發生錯誤的環境，因此我們使用固定分配的控制迷你時槽（mini-slot）給變速率（VBR）的訊務以保證其延遲時間並限制其延遲界線（delay bound）。另外，我們也設計了一個排序程式（scheduling algorithm）用來分配資料時槽；我們並使用滲漏漏斗（leaky bucket）來提高排序程式的效能、降低其複雜度。我們的方法，在低負載時能對及時性訊務可以提供低的延遲時間，在高負載時可以有效率的分配時槽給所有的使用者，同時對不同的訊務類別間亦維持其分配的公平性。

透過軟體模擬，與其它的方法比較起來，我們的方法無論在高負載或低負載時都可以對及時性訊務提供延遲限制同時保證所有訊務所要求的服務品質。

In this paper, we propose and analyze a new media access control (MAC) protocol that can support various ATM traffics efficiently in wireless ATM network environment. Since wireless channel is error-prone and wireless bandwidth is scarce, it becomes an important issue to devise an appropriate MAC protocol to allocate limiting resources to each user efficiently as well as to meet the desired QoS of each connection. The aim of our MAC protocol is to reduce and bound the delay time of real time traffics while maintain the QoS requirements of other traffics. Besides, we also design an efficient scheduling algorithm that supports variable characteristics of VBR traffic well and allocates data slots fair. We use leaky bucket functionality in the base station (BS) to improve the performance and reduce the complexity of the scheduling algorithm. The simulation results show that our protocol has better performance both when the system is in low load and heavy load.

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http://www.ee.ucla.edu/~jeanf/
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