藍芽、IEEE802.11及GPRS是目前普遍被一般使者所接受的三個無線通訊技術，其中藍芽是一個低價格及低耗電量的通訊技術，但其通訊距離較短，且傳輸速度也不是最佳的。IEEE 802.11的傳輸速度是其被使用者喜愛的原因，可是價格與耗電量均較藍芽晶片昂貴，雖然其通訊距離較藍芽技術遠，但仍不及GPRS技術。傳輸距離可說是無遠弗界的GPRS是其無可取代的優點，且提供高速移動中語音及資料通訊，然而價格、耗電量及傳輸速度卻是在三者中表現較差。如果能結合藍芽、IEEE802.11及GPRS的優點將使得無線通訊的好處發揮到最佳的狀態，將會满足大部份的使用者的需求。本論文將解決藍芽和IEEE802.11間的切換問題，使通訊中的行動主機能隨心所欲的連接、切斷藍芽或IEEE802.11的連線，如有必要還要能讓藍芽及IEEE802.11進入休眠模式。本論文將完成藍芽控制的實作，以支援行動主機在Windows的環境中能在藍芽、802.11與GPRS這三種網路中無間縫換手。

Bluetooth, IEEE802.11, and GPRS wireless technologies have been widely used nowadays. Bluetooth is a wireless communication technology that provides low cost, low power consumption, and short-range radio network connections. IEEE802.11 supports a higher (54Mbps) transmission rate, and longer (300meters) transmission range compared to Bluetooth. IEEE802.11 consumes more energy than Bluetooth, which limits the use of mobile device, powered by battery. On the other hand, GPRS technology enables mobile device connecting to Internet anywhere provided the existence of base stations and supports high-speed mobility during communication. However, the user is charged in using GPRS due to the use of licensed bandwidth and provides relative low transmission rate compared with Bluetooth and 802.11. Integrating the Bluetooth, IEEE802.11, and GPRS systems that take advantages from all of them will enable the efficient use of radio resource which provide the communication with high bandwidth and low cost. This paper proposes a novel mechanism for resolving the seamless handoff problem between Bluetooth and IEEE 802.11, providing advantages of lower power consumption from Bluetooth and high transmission rate from 802.11. A seamless platform has been implemented that support full functions of Bluetooth HCI driver on Windows operating system. The supported Bluetooth HCI driver facilitates functions for seamless handoff control including link connection and disconnection, monitoring link quality, and switching between active and sleep modes.

目錄
第一章、緒論				1
第二章、研究背景與系統架構			5
2.1研究背景				5
2.2研究動機與目的				9
2.3系統環境與問題描述			9
第三章、藍芽/IEEE802.11無間隙換手設計	12
第四章、支援藍芽/IEEE802.11無間隙換手的藍芽HCI driver實作					16
4.1建立連線				18
4.2中斷連線				20
4.3監測連線品質				21
第五章、效能測試與評估			22
5.1測試環境				22
5.2測試流程				22
參考文獻					24
附錄一：HCI driver header file		26

圖目錄
圖(一) ： 不同的無線通訊技術使用時機		3
圖(二) ： piconet 資料傳送的方式		6
圖(三) ： 藍芽建立連線過程			6
圖(四) ： IEEE802.11 CSMA/CA的運作		8
圖(五) ： 系統架構				10
圖(六) ： seamless handoff初始運作流程圖	13
圖(七) ： 藍芽系統架構			16
圖(八) ： HCI driver的架構			17
 
表目錄
表(一) ： HCI_Write_Scan_Enable 參數定義	18
表(二) ： 中斷連線的原因			20

[1]	J. Haartsen, M. Naghshineh, J. Inouye, O. Joeressen, and W. Allen, “Bluetooth: Vision, Goals, and Architecture”, Mobile Computing and Communications Review, Vol. 2, No. 4, ACM, October 1998, pp.38-45.
[2]	Mark Stemm and Randy H. Katz,  “Vertical Handoffs in Wireless Overlay Networks.”, ACM MONET 3(4), 1998.
[3]	Jean Tourilhes and Casey Carter, “P-HANDOFF : A PROTOCOL FOR FINE GRAINED PEER-TO-PEER VERTICAL HANDOFF”, PIMRC 2002.
[4]	Bluetooth SIG,  “Specification of the Bluetooth System Version 1.1”, February 2001.
[5]	IEEE802.11 : Wireless LAN medium access control(MAC) and physical layer(PHY) specifications, IEEE Std 802.11.
[6]	Extended Systems, inc. , “XTNDConnect Blue SDK for Windows”, 2002
[7] GSM WORLD, “Guidelines for IPv4 Addressing and AS Numbering for GPRS Network Infrastructure and Mobile Terminals”
[8] http://www.bluez.org
[9] http://developer.axis.com/software/bluetooth
[10] http://affix.sourceforge.net
[11] http://www.alphaworks.ibm.com/tech/bluedrekar