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.
Thursday, March 22, 2012
Thursday, March 8, 2012
Paper Reading #6: An efficient algorithm for scheduling in bluetooth piconets and scatternets
Ramana Reddy, G., Bhatnagar, S., Rakesh, V., and Chaturvedi, V. "An efficient algorithm for scheduling in bluetooth piconets and scatternets". Wireless Networks (10220038). Oct2010, Vol. 16 Issue 7, p1799-1816.
The expressed algorithm sought to get increased throughput and reduced packet delays in bluetooth piconets and scatternets all the while maintaining relatively fair traffic flow. Using multi-layered parameterized policies, the algorithm schedules on the slave nodes of the network. The way the group scheduled the packets was based on the two-timescale simultaneous perturbation stochastic approximation (SPSA) algorithm.
The algorithm showed better performance in both piconets and scatternets in polling and data rates for bluetooth over conventional algorithms. While the performance was greater, I don't think it necessary to necessarily using this algorithm because the performance increase was not astoundingly significant.
The expressed algorithm sought to get increased throughput and reduced packet delays in bluetooth piconets and scatternets all the while maintaining relatively fair traffic flow. Using multi-layered parameterized policies, the algorithm schedules on the slave nodes of the network. The way the group scheduled the packets was based on the two-timescale simultaneous perturbation stochastic approximation (SPSA) algorithm.
The algorithm showed better performance in both piconets and scatternets in polling and data rates for bluetooth over conventional algorithms. While the performance was greater, I don't think it necessary to necessarily using this algorithm because the performance increase was not astoundingly significant.
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