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題名 | IEEE 802.16e MAC層的電源管理機制研究=Power Management Mechanism of IEEE 802.16e MAC |
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作者姓名(中文) | 余誌民; 陳宥霖; 曹孝櫟; | 書刊名 | 新新科技年刊 |
卷期 | 3 2007.01[民96.01] |
頁次 | 頁285-293 |
分類號 | 448.6 |
關鍵詞 | 電力管理; 服務品質; 排程方法; 睡眠模式; Power management; Quality of service; Scheduling method; Sleep mode; |
語文 | 中文(Chinese) |
中文摘要 | 在802.16e中,為行動終端裝置(Mobile Subscriber Station, MSS)提供了睡眠模式(Sleep Mode),並為不同的應用設計不同種類的省電類別(Power Saving Class)來達到省電的目的。每一種省電類別都有其獨特的睡眠行為來適應不同種類的應用,其中的參數是由MSS和基地臺(Base Station, BS)根據其應用程式所要求的服務溝通出來的。當MSS切換到睡眠模式時,MSS關閉它的無線網路介面來達到省電的目的,同時BS必須將在這段時間內要傳送給該MSS的資料暫存起來,直到當MSS醒來時才將資料傳送給它。很明顯的,當一個MSS沒有資料要收送時,它應該進入到睡眠模式來節省耗電,然而,當MSS擁有一個週期性會有資料需要處理的連結(connection)時,為了不違反該連結所要求的服務品質(Quality of Service, QoS),必須小心地設定睡眠模式的參數。因此,IEEE 802.16e提供了比以往一般無線區域網路更為彈性的睡眠模式,然而,並沒有一個方法能有效利用此睡眠模式來達到省電的效果。在本文中,提出固定睡眠週期和動態睡眠週期排程方法,也展示這兩個睡眠模式運作的排程方法,從電腦模擬分析結果顯示,這兩個方法均比標準中所定的方法更有效率,同時,也可以保證MSS原本所要求的QoS。 |
英文摘要 | The IEEE 802.16e defines the sleep mode for mobile subscriber stations (MSSs) and also specifies several power saving classes for different applications. Each power saving class specifies a particular sleep behavior of an MSS to accommodate the different characteristics of applications. The parameters of a power saving class are negotiated between an MSS and a base station (BS). If an MSS switches to the sleep mode, the MSS turns off its wireless interface to conserve the energy during the sleep period, and meanwhile the BS must buffer the incoming packets during that period. While the MSS wake up, the BS sends queued packets to the MSS. Obviously; an MSS should try to enter the sleep mode when it does not have packets to send or to receive. However, for an MSS with an active connection that generates packets periodically, the parameters such as the sleep periods should be carefully chosen in order not to violate the QoS requirements of that connection. IEEE 802.16e offers more flexible sleep mode operations than WLAN, but, unfortunately, the previous studies did not fully utilize the sleep modes in reducing power consumption of an MSS. In this paper, we present two scheduling schemes on sleep mode operations to maximize sleep time of an 802.16e MSS for multiple connections. Performance results show that these two scheduling methods not only achieve better sleep mode efficiency than the conventional methods but also guarantee the QoSs of connections for the MSS. |
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