Tight Bounds for Deterministic h-Shot Broadcast in Ad-Hoc Directed Radio Networks

Authors Aris Pagourtzis , Tomasz Radzik

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Aris Pagourtzis
  • School of ECE, National Technical University of Athens, Athens, Greece
Tomasz Radzik
  • Department of Informatics, King’s College London, London, the United Kingdom

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Aris Pagourtzis and Tomasz Radzik. Tight Bounds for Deterministic h-Shot Broadcast in Ad-Hoc Directed Radio Networks. In 43rd International Symposium on Mathematical Foundations of Computer Science (MFCS 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 117, pp. 80:1-80:13, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)


We consider the classical broadcast problem in ad-hoc (that is, unknown topology) directed radio networks with no collision detection, under the additional assumption that at most h transmissions (shots) are available per node. We focus on adaptive deterministic protocols for small values of h. We provide asymptotically matching lower and upper bounds for the cases h=2 and h=3. While for h=2 our bound is quadratic, similar to the bound obtained for oblivious protocols, for h=3 we prove a sub-quadratic bound of Theta(n^2 log log n / log n), where n is the number of nodes in the network. The latter is the first result showing an adaptive algorithm which is asymptotically faster than oblivious h-shot broadcast protocols, for which a tight quadratic bound is known for every constant h. Our upper bound for h=3 is constructive, making use of constructions of graphs with large girth. We also show an improved upper bound of O(n^(1+alpha/sqrt{h})) for h >= 4, where alpha is an absolute constant independent of h. Our upper bound for h >= 4 is non-constructive.

Subject Classification

ACM Subject Classification
  • Theory of computation → Distributed algorithms
  • Mathematics of computing → Extremal graph theory
  • Ad-hoc radio networks
  • wireless networks
  • deterministic broadcast
  • adaptive protocols
  • limited transmissions


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