Leader Election Using Loneliness Detection
Name
MIT-CSAIL-TR-2011-045.pdf
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499.91 KB
Format
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Checksum (MD5)
61f51c2737b9d57e31b1c6b5c224b2f8
Author(s)
Ghaffari, Mohsen
Lynch, Nancy A.
Sastry, Srikanth
Advisor(s)
Nancy Lynch
Date Issued
October 12, 2011
Series/Report no.
MIT-CSAIL-TR-2011-045
Abstract
We consider the problem of leader election (LE) in single-hop radio networks with synchronized time slots for transmitting and receiving messages. We assume that the actual number n of processes is unknown, while the size u of the ID space is known, but is possibly much larger. We consider two types of collision detection: strong (SCD), whereby all processes detect collisions, and weak (WCD), whereby only non-transmitting processes detect collisions. We introduce loneliness detection (LD) as a key subproblem for solving LE in WCD systems. LD informs all processes whether the system contains exactly one process or more than one. We show that LD captures the difference in power between SCD and WCD, by providing an implementation of SCD over WCD and LD. We present two algorithms that solve deterministic and probabilistic LD in WCD systems with time costs of O(log(u/n)) and O(min(log(u/n), (log(1/epsilon)/n)), respectively, where epsilon is the error probability. We also provide matching lower bounds. We present two algorithms that solve deterministic and probabilistic LE in SCD systems with time costs of O(log u) and O(min(log u, loglog n + log(1/epsilon))), respectively, where epsilon is the error probability. We provide matching lower bounds.
Subjects
wireless networks
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