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Modeling Channel Conflict Probabilities between IEEE 802.11b and IEEE 802.15.1 Networks

Modeling Channel Conflict Probabilities between IEEE 802.11b and IEEE 802.15.1 Networks. Ling-Jyh Chen and Ting-Kai Huang Institute of Information Science, Academia Sinica. Outline. Introduction Overview of WLAN & WPAN standards Coexistence issues Analysis Conclusion. Introduction.

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Modeling Channel Conflict Probabilities between IEEE 802.11b and IEEE 802.15.1 Networks

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  1. Modeling Channel Conflict Probabilities between IEEE 802.11b and IEEE 802.15.1 Networks Ling-Jyh Chen and Ting-Kai Huang Institute of Information Science, Academia Sinica

  2. Outline • Introduction • Overview of WLAN & WPAN standards • Coexistence issues • Analysis • Conclusion

  3. Introduction • With the increasingly deployed WPAN devices, channel conflict has become very frequent and severe. • Previous studies focus on modeling packet/frame error rates and/or measuring data throughput when channel conflicts are present. • In this paper, we study the prob of channel conflicts when WPAN/WLAN devices coexist.

  4. Channel allocation of IEEE 802.11/15 standards

  5. Channel allocation of IEEE 802.15 standards • IEEE 802.11b • IEEE 802.15.1

  6. Coexistence issues • Coexistence:The ability of one system to perform a task in a given shared environment where other systems have an ability to perform their tasks and may or may not be using the same set of rules. • IEEE 802.15.2:Coexistence of Wireless Personal Area Networks with Other Wireless Devices Operating in Unlicensed Frequency Bands

  7. Analysis • 3 cases • One 802.15.1 + One 802.11b • One 802.15.1 + Two 802.11b • One 802.15.1 + Three 802.11b

  8. Frequency Hopping in Bluetooth • Hopping cycle (32 slots) is defined as: FH kernel selects a segment of 64 adjacent channels out of 79, and then 32 of them are used one at a time without repetition in a random order • Next, a different 32-hop sequence is chosen from another segment of 64 adjacent channels 32 of them are chosen

  9. Analysis 1: one 15.1 & one 11.b • P[R=r]: the prob that there are r conflicting channels in the selected segment of 64 adjacent channels • P[K=k|R=r]: the prob that, given r conflicted channels in the 64 adjacent channels, k out of the selected 32 hop sequence are conflicted • S=1: the selected channel (out of the 32 hop sequence) is conflicted

  10. Analysis 1: one 15.1 & one 11.b

  11. Analysis 2: one 15.1 & two 11.b

  12. Analysis 3: one 15.1 & 3 11.b

  13. Conclusion • The channel conflict probability increases linearly as the number of IEEE 802.11b networks increases. • The proposed model is simple and applicable to calculating channel conflict probabilities of other wireless technologies. • Future work is to take the error models (e.g., SNR vs PER) into account, and extend our analysis to model the packet/frame error rates for multiple coexisting WPAN/WLAN networks.

  14. Thanks!http://www.iis.sinica.edu.tw/~cclljj/http://nrl.iis.sinica.edu.tw/Thanks!http://www.iis.sinica.edu.tw/~cclljj/http://nrl.iis.sinica.edu.tw/

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