# On the shallow-light Steiner tree problem

Conference paper

Guo, Longkun, Liao, Kewen and Shen, Hong. (2014). On the shallow-light Steiner tree problem. 15th International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT 2014). Hong Kong, China 09 - 14 Dec 2014 IEEE Computer Society. pp. 56-60 https://doi.org/10.1109/PDCAT.2014.17
Authors Guo, Longkun, Liao, Kewen and Shen, Hong Conference paper Let G = (V, E) be a given graph with nonnegative integral edge cost and delay, S ⊆ V be a terminal set and r ∈ S be the selected root. The shallow-light Steiner tree (SLST) problem is to compute a minimum cost tree spanning the terminals of S, such that the delay between r and every other terminal is bounded by a given delay constraint D ∈ ℤ 0 + . It is known that the SLST problem is NP-hard and unless NP ⊆ DTIME(n log log n ) there exists no approximation algorithm with ratio (1, γ log2 n) for some fixed γ > 0 [12]. Nevertheless, under the same assumption it admits no approximation ratio better than (1, γ log 2 n) for some fixed γ > 0 even when D = 2 [2]. This paper first gives an exact algorithm with time complexity O(3 t nD + 2 t n 2 D 2 + n 3 D 3 ), where n and t are the numbers of vertices and terminals of the given graph respectively. This is a pseudo polynomial time parameterized algorithm with respect to the parameterization “number of terminals”. Later, this algorithm is improved to a parameterized approximation algorithm with a time complexity O(3 t n 2 /∈ + 2 t n 4 /∈ 2 + n 6 /∈ 3 ) and a bifactor approximation ratio (1 + ∈, 1). That is, for any small real number ∈ > 0, the algorithm computes a Steiner tree with delay and cost bounded by (1 + ∈)D and the optimum cost respectively. shallow light Steiner tree; parameterized approximation algorithm; exact algorithm; layer graph; pseudopolynomial time 2014 IEEE International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT) IEEE Computer Society 2379-5352 https://doi.org/10.1109/PDCAT.2014.17 2-s2.0-84946143842 LicenseAll rights reservedFile Access LevelControlled 2014 15th International Conference on Parallel and Distributed Computing, Applications and Technologies 56-60 9781479983346 https://doi.org/10.1109/PDCAT35871.2014 Published 03 Aug 2015 23 Jul 2021

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