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研究生： 陳凱修
Kai-Hsiu Chen
論文名稱： 3GPP與WLAN整合系統之省電機制
Energy Conservation in 3GPP/WLAN Integrated Networks
指導教授： 陳志成
Jyh-Cheng Chen
口試委員:
學位類別： 碩士
Master
系所名稱： 電機資訊學院 - 資訊工程學系
Computer Science
論文出版年： 2005
畢業學年度： 93
語文別： 英文
論文頁數： 40
中文關鍵詞： 封包壓縮 、第三代行動通訊技術 、無線區域網路 、行動管理
外文關鍵詞： ROHC, 3GPP, WLAN, Mobility management, Paging, PDG
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    • 在快速封包交換網路裡，如無線區域網路與第三代行動網路，行動裝置的省電機制是非常重要的，因為快速地傳送與接收封包，會損耗很多的電能，而導致行動裝置無法持久使用；在此論文中，以3GPP (3rd Generation Partnership Project)所提出的整合架構為基礎，提出兩個方法來幫助行動裝置的省電，分別是ROHC (RObust Header Compression)與無線區域網路下的Paging。
    ROHC以壓縮封包header大小來節省頻寬的使用，因為封包縮小，所以原本所需的傳輸時間縮短，傳送與接收封包所耗的電能亦隨之減少，因此封包壓縮對於無線介面也具有省電的功效。
    另一方面，無線區域網路是屬於分散式系統，缺乏良好設計的中控核心網路，來服務個別的行動裝置，行動管理機制也就無法做到；所幸，3GPP提出了3GPP核心網路與無線區域網路的整合架構與機制，無線區域網路下的行動管理機制與Paging服務，都能由3GPP新提出的核心網路節點來達成，本論文所提出的無線區域網路Paging方法，能讓行動裝置不論連上3GPP核心網路，或是無線區域網路，都能夠在沒有封包傳輸的時候，進入休眠模式，並由核心網路偵測是否有封包要傳送給休眠中的行動裝置，如果有，就根據行動管理機制所記錄的行動裝置位置，甦醒行動裝置來接收封包，因此，休眠使得行動裝置得以省電。

    Energy conservation is very important to mobile devices in high-speed packet data networks, such as WLAN and 3GPP packet-switching networks. Both RObust Header Compression
    (ROHC) and WLAN Paging are helpful for energy saving. This thesis presents the design and implementation of the two schemes in the 3GPP/WLAN integrated networks.
    ROHC is designed for bandwidth saving originally by reducing packet header size. Because the header size is reduced, the transmission time could be shorten. Thus, energy could be conserved. Therefore, header compression is useful for energy saving.
    On the other hand, location management for mobile devices is usually hard to achieve in WLANs because of lacking a well-designed core network. Because 3GPP has proposed
    an architecture for the 3GPP/WLAN integrated networks, WLAN paging and location management could be done by the newly introduced components in the 3GPP core network. With
    the WLAN paging proposed in this thesis, mobile devices could sleep no matter they connect to 3GPP or WLAN system. Energy, thus, is conserved.

    Acknowledgments Abstract List of Tables List of Figures 1. Introduction 1.1. Motivation 1.2. Related Work 1.2.1. Header Compression 1.2.2. Paging 1.3. Organization of the Thesis 2. ROHC 2.1. Overview2.2. Design and Implementation 2.2.1. States and Modes 2.2.2. ROHC Packet Format 2.2.3. Window-Based LSB (W-LSB) Encoding 2.2.4. RTP Fields 2.3. Performance Analysis 3. Paging 3.1. Overview 3.2. Design and Implementation 3.2.1. IEEE 802.11 Consideration 3.2.2. Testbed 3.2.3. Power Management States 4. Conclusion Bibliography

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    [22] Charlie Kaufman, “Internet Key Exchange (IKEv2) Protocol.” IETF draft-ietf-ipsecikev2-17.txt, Mar. 2005.

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