近年來，越來越多無線網路設施被建立在我們周圍的環境中，例如IEEE 802.11無線區域網路 (Wireless Local Area Networks, WLANs) 與Bluetooth (BT) 等等的無線裝置。雖然他們使用不同的無線網路技術，但卻都有個共同的特性，就是運作在2.4 GHz ISM (Industrial, Scientific, and Medical) 頻帶上。在彼此的傳輸範圍內同時使用兩種無線網路科技，雖然它們各自有各自對付干擾的機制，卻還是免不了受到對方的影響。尤其在涵蓋範圍內越多無線設施同時存在，干擾問題會越來越嚴重。
在802.11 WLAN與Bluetooth共存 (coexistence) 的議題中，我們發現雖然WLAN與Bluetooth的“資料”傳輸生產量 (throughput) 均會降低，但以使用者的角度來看還在可以接受的範圍之內。然而，對於Bluetooth“聲音”連線 (SCO link) 的影響卻是很大的，嚴重時甚至會導致連線中斷。這種結果對於使用者來說是比較無法接受的。本篇論文將針對Bluetooth SCO連線，提出在WLAN滿佈的環境下確保藍牙語音通訊品質的方法。

Wireless network systems, such as IEEE 802.11 wireless local area networks (WLANs) and Bluetooth, are increasingly constructed in our surrounding environment. Although devices running these two wireless systems operate with different technologies, they both work in the 2.4 GHz ISM (Industrial, Scientific, and Medical) band, and therefore lead to interference. The problem of Bluetooth interfering with a WLAN is particularly serious with a Bluetooth device located in an area with more than one overlapping WLAN. Interference is not a significant problem if it only degrades data throughput. However, it is unacceptable if it causes disconnection of the Bluetooth SCO link (i.e., voice connection). This study presents mechanisms to sustain the quality of Bluetooth SCO link, under the interference, with only at a minor cost of WLAN’s data throughput.

中文摘要.....................................................................................................I
英文摘要...................................................................................................II
目錄..........................................................................................................III
圖目錄.......................................................................................................V
表格目錄.................................................................................................VII
字母縮寫對照表...................................................................................VIII
第一章 導論............................................................................................1
1.1 簡介...........................................................................................1
1.2 研究動機...................................................................................4
1.3 論文架構...................................................................................6
第二章 背景與相關研究........................................................................8
2.1 藍牙概述...................................................................................8
2.1.1 藍牙技術發展源流...........................................................9
2.1.2 藍牙通訊協定階層架構.................................................10
2.1.3 藍牙無線電.....................................................................12
2.1.4 藍牙主從式分時雙工.....................................................14
2.1.5 藍牙連線(link)類型之定義............................................15
2.1.6 藍牙網路結構.................................................................16
2.1.7 藍牙網路連線建立程序.................................................18
2.2 藍牙與WLAN相互干擾問題..................................................19
2.3 相關研究...................................................................................23
2.3.1 Alternating Wireless Medium Access..............................24
2.3.2 Packet Traffic Arbitration................................................24
2.3.3 Adaptive Frequency-Hopping.........................................25
2.3.4 Overlap Avoidance...........................................................26
2.3.5 Bluetooth Interference Aware Scheduling.......................27
2.3.6 Bluetooth Carrier Sense...................................................27
2.3.7 Interference Source Oriented AFH..................................28
第三章 藍牙SCO連線干擾消除機制.................................................29
3.1 BSIM機制...............................................................................30
3.1.1 可能碰撞的兩種情況.....................................................30
3.1.2 802.11 MAC CSMA/CA機制........................................33
3.1.3 實例說明.........................................................................35
3.2 E-BSIM機制...........................................................................36
3.2.1 EV型態封包...................................................................37
3.2.2 整合EV型態封包與BSIM機制......................................38
第四章 模擬結果及分析......................................................................40
4.1 藍牙模擬器UCBT簡介...........................................................40
4.2 實驗數據分析與討論.............................................................41
4.2.1 實驗一：WLAN對藍牙SCO連線所造成的影響......42
4.2.2 實驗二：藍牙SCO連線對WLAN所造成的影響.........45
4.2.3 實驗三：BSIM與E-BSIM效能評估..............................46
第五章 結論與未來展望......................................................................49
參考文獻..................................................................................................51

[1] Bluetooth SIG, “Bluetooth Specification”, http://www.bluetooth.com.
[2] IEEE Std. 802.11, “IEEE Standard for Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specification,” June 1997.
[3] IEEE 802.15.2-2003, “IEEE Recommended Practice for Information Technology — Part 15.2: Coexistence of Wireless Personal Area Networks with Other Wireless Devices Operating in the Unlicensed Frequency Bands,” 2003.
[4] IEEE 802.11b-1999, “Supplement to IEEE Standard for Information technology — Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Higher-Speed Physical Layer Extension in the 2.4 GHz Band,” 1999.
[5] IEEE 802.11g-2003, “IEEE Standard for Information technology — Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications Amendment 4: Further Higher Data Rate Extension in the 2.4 GHz Band,” 2003.
[6] C.F. Chiasserini, and R. R. Rao, “Coexistence mechanisms for interference mitigation in the 2.4-GHz ISM band,” IEEE Transactions on Wireless Communications, Volume: 2, Issue: 5, Sept. 2003.
[7] C.F. Chiasserini, and R. R. Rao, “Coexistence mechanisms for interference mitigation between IEEE 802.11 WLANs and Bluetooth,” in Proceedings of the IEEE INFOCOM 2002, Volume: 2, 23-27 June 2002, pp. 590–598.
[8] N. Golmie, N. Chevrollier, and O. Rebala, “Bluetooth and WLAN coexistence: challenges and solutions,” IEEE Wireless Communications, [see also IEEE Personal Communications], Volume: 10, Issue: 6, Dec. 2003, pp. 22–29.
[9] M. Cho-Hoi Chek and Yu-Kwong Kwok, “On adaptive frequency hopping to combat coexistence interference between Bluetooth and IEEE 802.11b with practical resource constraints,” in Proceedings of 7th International Symposium on Parallel Architectures, Algorithms and Networks, 10-12 May 2004, pp. 391–396.
[10] Carlos de M. Cordeiro, Sachin Abhyankar, Rishi Toshiwal, and Dharma P. Agrawal, “A Novel Architecture and Coexistence Method to Provide Global Access to/from Bluetooth WPANs by IEEE 802.11 WLANs,” in Proceedings of the 2003 IEEE International Performance, Computing, and Communications Conference, 9-11 April 2003, pp. 23–30.
[11] Hoi Kit Yip and Yu-Kwong Kwok, “A performance study of packet scheduling algorithms for coordinating colocated Bluetooth and IEEE 802.11b in a Linux machine,” in Proceedings of 7th International Symposium on Parallel Architectures, Algorithms and Networks, 10-12 May 2004, pp. 533–538.
[12] A.E. Salloum Salazar, “Positioning Bluetooth and Wi-Fi Systems,” IEEE Transactions on Consumer Electronics, Volume: 50, Issue: 1, Feb 2004, pp. 151–157.
[13] A.K. Arumugam, A. Doufexi, A.R. Nix, and P.N. Fletcher, “An Investigation of the Coexistence of 802.11g WLAN and High Data Rate Bluetooth Enabled Consumer Electronic Devices in Indoor Home and Office Environments,” IEEE Transactions on Consumer Electronics, Volume: 49, Issue: 3, Aug. 2003, pp. 587–596.
[14] Ns-2 simulator. http://www.isi.edu/nsnam/ns/
[15] UCBT simulator. http://www.ececs.uc.edu/~cdmc/ucbt/
[16] 802.11無線網路技術通論
Matthew S. Gast著 黃裕彰譯 O’Reilly 2003
[17] 無線藍芽技術—深入探討
禹帆編著 文魁資訊股份有限公司 2001
[18] 無線通訊技術—探索藍芽
Michael Miller著 李純、周開波、童兆豐譯 邱國書校訂
五南圖書出版公司 2003
[19] 藍芽技術解說
杉浦彰彥原著 蘇慶輝、蘇慶宏編著
全華科技圖書股份有限公司 2001