在支援行動台( Mobile station，MS )的IEEE 802.16e 網路環境之下，對於行動台來說，所有的運作都是依靠有限的電池電能，所以如何有效利用電能是非常重要的研究議題。在IEEE 802.16e 系統中，行動台被准許進入睡眠模式以節省電能，截至目前為止，有各種不同的省電機制之研究被提出，可是都只針對單播服務連線的應用環境，對於MS同時具有多個即時單播與多播廣播服務 ( Multicast Broadcast Services ) 連線之應用環境，並未提出有效的節能排程機制。因此本論文除了考慮即時單播連線之外並同時考慮於多播廣播服務的應用環境之下，提出一個有效的節能排程機制，以降低一個細胞(cell)內的MS之總耗電量，同時滿足即時連線的服務品質（Quality of Service，QoS）之要求。本研究使用封包聚集的方法將可於同一個訊框之中同時接收多播連線與單播連線封包的行動台個數最大化，使得行動台能夠於接收多播連線與單播連線封包後立即進入睡眠狀態，以增加睡眠時間，節省行動台的電能消耗。

Broadband wireless access systems usually provide flexible sleep-mode operations for mobile stations to conserve their energy during sleep or active mode. i.e. the IEEE 802.16e,offers several power-saving classes that can be associated with different types of network connections to minimize power consumption of mobile stations. Unfortunately, previous studies did not fully utilize the sleep-mode features to save the energy of a mobile station with unicast and muticast connections. In this pape, a energy-efficient packet scheduling algorithms for both unicast and multicast services without violating the quality of services (QoSs) of real-time unicast connections. Thes chemes not only guarantee the quality of services (QoSs) of real-time connections but also improve energy efficiency of the whole system in which multicast traffic and unicast traffic.

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