한국통신학회논문지 (The Journal of Korean Institute of Communications and Information Sciences)

  • 제27권7B호
  • /
  • Pages.706-718
  • /
  • 2002
  • /
  • 1226-4717(pISSN)
  • /
  • 2287-3880(eISSN)
한국통신학회 (The Korean Institute of Commucations and Information Sciences)
권호 표지

블루투스 및 무선 LAN 시스템의 동시지원을 위해 Listen-Before-Talk 기법을 결합한 Adaptive Frequency Hopping 방식의 제안

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

  • 김용석 ((주) 삼성종합기술원 i-Networking Lab) ;
  • ;
  • 장경훈 ((주) 삼성종합기술원 i-Networking Lab) ;
  • 차균현 (고려대학교 전자공학과 차세대 이동통신 연구실)
  • 발행 : 2002.07.01
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초록

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 If the channel is busy, packet transmission is withdrawn until another chance.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.

키워드

참고문헌

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