隨著科技日益的創新，無線網路的發展,無疑對人們的生活帶來了重大的變化，讓許多人可以在隨時隨地的無線上網,查詢所需之資訊，不必為了尋找可用的網路線而傷腦筋，透過IEEE 802.16(WiMax) 標準，人們可以在城域地區悠遊的無線上網。而往後的無線通訊產品,若依據IEEE 802.16e 標準去設計，則所生產之產品代表支援可移動性。
有了可無線上網的便利性，相對的也帶動人們對於無線通訊產品的要求越來越高；不僅要求高度的可移動性，並且希望購買的產品能有較長的待機時間，因此省電的問題顯得十分重要。因為假如能夠節省電量，代表使用者能更有效率的使用產品。
IEEE 802.16e標準中為了達到省電的目的，定義了所謂的睡眠模式；讓我們行動用戶端(MSS)的設備在沒有下載東西時，為了降低功率消耗而進入所謂的睡眠狀態。但是，在IEEE 802.16e標準裡並沒有提供睡眠方式的選擇，因此我們針對人們最常使用的三種話務類型，分別是E-mail、WWW、FTP，個別的考慮其功率消耗以及因為進入睡眠模式而引起的時間延遲，提供適當的睡眠模式選擇。

As time goes on, the innovation of technology and the development of wireless network bring an important reformation for human life. Now, we can inquire the information we needed by wireless, without transmission line. Through the use of IEEE 802.16e technology, man can connect to the Internet in metropolitan area. The wireless communication products using the IEEE 802.16e standard, will support the mobility.
With the convenience of connecting to the Internet, it also means human will have many requirements with wireless communication products; therefore, we demand not only the higher mobility, but also the more battery life time. It’s a distinct issue for energy saving, if mobile devices have more life time. This means users can efficaciously use the wireless machine.
In addition, for the sake of energy saving, IEEE 802.16e defines the sleep mode; MSS can energy down when there is no traffics arrival in downloading time. Choosing sleep mode type for certain traffic type is outside of the scope of the standard. Hence, we propose a decision rule to choose an appropriate sleep mode for various traffic types including, individually, E-mail, WWW, and FTP. Energy consumption and delay are analysed in the research.

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