By Shlomi Dolev (auth.), Thomas Erlebach, Sotiris Nikoletseas, Pekka Orponen (eds.)
This ebook constitutes the completely refereed post-conference court cases of the seventh foreign Workshop on Algorithms for Sensor platforms, instant advert Hoc Networks, and self sufficient cellular Entities, ALGOSENSORS 2011, held in Saarbrücken, Germany, in September 2011. The sixteen revised complete papers awarded including invited keynote talks have been conscientiously reviewed and chosen from 31 submissions. The papers are prepared in tracks: sensor networks, overlaying subject matters comparable to localization, lifetime maximization, interference keep watch over, neighbor discovery, self-organization, detection, and aggregation; and advert hoc instant and cellular structures together with the subjects: routing, scheduling and ability optimization within the SINR version, non-stop tracking, and broadcasting.
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Additional resources for Algorithms for Sensor Systems: 7th International Symposium on Algorithms for Sensor Systems, Wireless Ad Hoc Networks and Autonomous Mobile Entities, ALGOSENSORS 2011, Saarbrücken, Germany, September 8-9, 2011, Revised Selected Papers
The normalized lifetime at this point is 4/3, a constant. This provides the same worst-case performance as RoundRobin. Load Balancing, Revisited. , k maintains 2j−1 parallel queues. Proper functioning of our algorithm requires balanced loads across these queues, but the hierarchical structure of log2 RoundRobin alleviates the load balancing issue if the Γk (j)’s are pushed onto a central stack in ascending order of j. To see this, suppse that the left half of Γk (2) runs out, while the right half is still going.
If the aﬀected node is part of the MIS, the node needs just to correct its invariant (which will possibly trigger role changes of other MIS nodes). Otherwise, the node does nothing. Second, the change invalidates (by adding or removing edges in the radius graph) the MIS. Here, nodes at which the MIS property is violated change their states to unmarked (and thus start executing the (5 + )-algorithm). The modiﬁcation of the (3+ )-algorithm is simpler: here, whenever the invariant of a decided node is violated, it just needs to change its state back to undecided.
2−β The approximation ratio of RoundRobin is thus at least 4(1−β) . – t(1,0,1) : With no sensors active in B, the worst case scenario for RoundRobin is a lifetime of n, with all n sensors at either 0 or 1. However, note that since β < 14 , OPT cannot achieve a lifetime of 2n under these conditions. ] In fact, the maximum network lifetime for OPT occurs when there are n2 pairs of sensors at β and 1 − β, each with radii set to 12 − β. Thus, the lifetime of 1 n OPT is at most n2 · 1 −β = 1−2β . The approximation ratio of RoundRobin is 2 thus at least 1 − 2β.