The hybrid method of Listen-Before-Talk and Adaptive Frequency Hopping for coexistence of Bluetooth and WLAN 


Vol. 27,  No. 7, pp. 706-718, Jul.  2002


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  Abstract

In bluetooth system, there are two kinds of interference. One is the frequency static interference, for example 802.11 direct sequence, the interferer uses fixed frequency band. Another is frequency dynamic interference, for example other piconets or 802.11 frequency hopping, the interferer uses dynamic frequency channel and cant be estimated. In this paper we introduce a novel solution of hybrid method of Listen-Before-Talk (LBT) and Adaptive Frequency Hopping (AFH) to address the coexistence of bluetooth and Direct Sequence of wireless local area network (WLAN). Before any bluetooth packet transmission, in the turn around time of the current slot, both the sender and receiver sense the channel whether there is any transmission going on or not. If the channel is busy, packet transmission is withdrawn until another chance. This is the LBT in Bluetooth. Because of asymmetry sense ability of WLAN and bluetooth, AFH is introduced to combat the left front-edge packet collisions. In monitor period of AFH, LBT is performed to label the channels with static interference. Then, all the labeled noisy channels are not used in the followed bluetooth frequency hopping. In this way, both the frequency dynamic and frequency static interference are effectively mitigated. We evaluate the solution through packet collision analysis and a detail realistic simulation with IP traffic. It turns out that the hybrid method can combat both the frequency dynamic and frequency static interference. The packet collision analysis shows it almost doubles the maximal system aggregate throughput. The realistic simulation shows it has the least packet loss.
Index Terms: bluetooth, 802.11, WLAN, WPAN, coexistence, listen-before-talk, adaptive frequency hopping, performance evaluation

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  Cite this article

[IEEE Style]

Y. Kim, B. Zhen, K. Jang, K. H. Tchah, "The hybrid method of Listen-Before-Talk and Adaptive Frequency Hopping for coexistence of Bluetooth and WLAN," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 7, pp. 706-718, 2002. DOI: .

[ACM Style]

Yongk Kim, Bin Zhen, Kyunghun Jang, and Kyun Hyon Tchah. 2002. The hybrid method of Listen-Before-Talk and Adaptive Frequency Hopping for coexistence of Bluetooth and WLAN. The Journal of Korean Institute of Communications and Information Sciences, 27, 7, (2002), 706-718. DOI: .

[KICS Style]

Yongk Kim, Bin Zhen, Kyunghun Jang, Kyun Hyon Tchah, "The hybrid method of Listen-Before-Talk and Adaptive Frequency Hopping for coexistence of Bluetooth and WLAN," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 7, pp. 706-718, 7. 2002.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880