WiMAX 微基站服務換手加速機制之研究

A study on mechanism for accelerating wimax femtocell handover

潘欣侑(Hsin-Yu Pan)

指導教授 ： 許超雲

大同大學/電機資訊學院/通訊工程研究所/碩士(2012年)

摘要

消費者對無線通訊的需求，驅動了技術不段的往前演進，通稱為WiMAX的全球互通微波存取技術應運而生，並且受到特定市場的歡迎。為了解決室內穿透不足的問題，近年標準組織將Femtocell微基站納入WiMAX的網路架構中，已提供在室內環境的滿意服務。
本論文針對WiMAX網路系統中Femtocell與Macrocell共存的情境，研究期間服務換手(Handover)協定訊息機制，並提出改良方法，以縮短換手過程的處理時間。
本論文所提出的建議方案，可讓Femtocell微基站提早向Macrocell基地台取得用戶台的連線参數設定值，以預作換手的準備；此方案經軟體實作WiMAX模擬網路之驗證，並藉由網路封包偵測工具的序息紀錄分析，發現平均可縮短換手過程處理時間約61%較果顯著，並可以確保原有換手功能之順利完成。

關鍵字

微基站 ； 換手 ； 全球互通微波存取 ； 加速機制

並列摘要

Demands from consumers drive the evolution of wireless communication technology. Worldwide Interoperability for Microwave Access, known as WiMAX, therefore emerged, and is welcome by particular markets. In order to provide satisfactory service in indoor environments, femtocell base stations are introduced into WiMAX network system.
This thesis analyzes the handover mechanism between femtocell and macrocell of WiMAX network, and proposes an improvement solution to shorten the processing time of handover.
The proposed solution will make femtocell get the configuration parameters of mobile stations from macrocell in early stage, to prepare the handover process in advance. This solution is realized and verified by a WiMAX simulation system. By means of message log analysis through a network sniffing tool, we found the handover processing time can be shortened by 61%, and the regular handover function is conformed.

並列關鍵字

WiMAX ； Handover ； Accelerating Mechanism ； Femtocell

參考文獻

[35] 葉富銘，「WiMAX FemtoBS 的發展策略與課題」，正文科技股份有限公司，2011 年 8 月。

[3] IEEE, IEEE Standard for Local and Metropolitan Area Networks - Part 16: Air Interface for Fixed Broadband Wireless Access Systems (IEEE 802.16-2004), IEEE, Oct 2004.

[7] M. Ma, Current Technology Developments of WiMax Systems, Springer Netherlands, 2009.

[8] R. Singoria and T. Oliveira, “Reducing Unnecessary Handovers: Call Admission Control Mechanism for Handover between WiMAX Macrocells and Femtocells”, Technical Report No. 002.12.2010, University of Cincinnati, 2010.

[9] S. Choi, Gyung-Ho Hwang, Taesoo Kwon, Ae-Ri Lim, and Dong-Ho Cho “Fast Handover Scheme for Real-time Downlink Services in IEEE 802.16e BWA Systems”, Proceedings of the IEEE 61st Vehicular Technology Conference, 2005.