$k$-Robust Single-Message Transmission

  • Authors:
  • André Kündgen;Michael J. Pelsmajer;Radhika Ramamurthi

  • Affiliations:
  • akundgen@csusm.edu and ramamurt@csusm.edu;pelsmajer@iit.edu;-

  • Venue:
  • SIAM Journal on Discrete Mathematics
  • Year:
  • 2010

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Abstract

We consider the problem of transmitting a message from a sender $s$ to a receiver $r$ through a network in which edges may fail and cannot recover. In the transmission protocols we consider, we require that $r$ may not be “flooded” by infinitely many copies of this message. A routing protocol is $k$-robust if it ensures that a message sent by $s$ will be received by $r$ when at most $k$ edges fail, unless no $s,r$-path remains. Graphs which have a $k$-robust protocol for all $k$ were characterized in [F. E. Fich, A. Kündgen, M. J. Pelsmajer, and R. Ramamurthi, SIAM J. Discrete Math., 19 (2005), pp. 815-847]. For any other graph, its robustness is the maximum $k$ for which it has a $k$-robust protocol. We provide general lower bounds for robustness by improving a natural protocol obtained from Menger's theorem. We determine robustness for several examples, such as complete graphs, grids, and hypercubes.