Thursday, March 22, 2012

Paper Reading #7: Calculation of probabilistic worst-case response-time for message in bluetooth

Umadevi Chezhian, U., Ramar, K., and Geetha, S. "Calculation of probabilistic worst-case response-time for message in bluetooth". Indian Journal of Science & Technology. Jul 2010. Vol. 3 Issue 7, p770-773.

This paper calculates the worst case response time for bluetooth transmission using calculations from the time relationship between 802.11 packets and bluetooth hops and the frequency distinction between a normal 802.11 direct sequence standard and the bluetooth frequency hops themselves.

There has been a release for bluetooth for adaptive frequency hopping (AFH) which decreased the number of collisions for packets.  Once the interference and frequencies are calculated, bluetooth message sending will work just as if there were no interference in the network.  The problem with this is the overhead it takes to establish this criteria.

In calculating the worst case, the first way they calculate is measuring the overlap in the packet sizes.  The other way the overlap in the time period based on the frequency.

Their conclusion is that the number of bluetooth hop overlaps depends on packet length and time offset.

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