Conflict-free colorings of shallow discs

  • Authors:
  • Noga Alon;Shakhar Smorodinsky

  • Affiliations:
  • Tel Aviv University, Tel Aviv, Israel;New York University, New York, NY

  • Venue:
  • Proceedings of the twenty-second annual symposium on Computational geometry
  • Year:
  • 2006

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Abstract

We prove that any collection of n discs in which each one intersects at most k others, can be colored with at most O(log3k) colors so that for each point p in the union of all discs there is at least one disc in the collection containing p whose color differs from that of all other members of the collection that contain p. This is motivated by a problem on frequency assignments in cellular networks, and improves the best previously known upper bound of O(log n) when k is much smaller than n.