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首页> 外文期刊>Discrete Applied Mathematics >Labeling bipartite permutation graphs with a condition at distance two
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Labeling bipartite permutation graphs with a condition at distance two

机译:用距离为2的条件标记二分置换图

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摘要

An L(p, q)-labeling of a graph G is an assignment f from vertices of G to the set of non-negative integers {0, 1,...,lambda} such that vertical bar f (u) - f(v)vertical bar >= p if u and v are adjacent, and vertical bar f(u) - f(v)vertical bar >= q if u and v are at distance 2 apart. The minimum value of lambda for which G has L(p, q)-labeling is denoted by lambda(p,q)(G). The L(p, q)-labeling problem is related to the channel assignment problem for wireless networks. In this paper, we present a polynomial time algorithm for computing L(p, q)-labeling of a bipartite permutation graph G such that the largest label is at most (2p-1)+q(bc(G)-2), where bc(G) is the biclique number of G. Since lambda(p,q)(G) >= p + q(bc(G) - 2) for any bipartite graph G, the upper bound is at most p - 1 far from optimal.
机译:图G的L(p,q)标注是从G的顶点到一组非负整数{0,1,...,lambda}的赋值f,以使竖线f(u)-f (v)如果u和v相邻,则竖线> = p,如果u和v相距2,则竖线f(u)-f(v)竖线> = q。 G具有L(p,q)标记的lambda的最小值由lambda(p,q)(G)表示。 L(p,q)标记问题与无线网络的信道分配问题有关。在本文中,我们提出了一种多项式时间算法,用于计算二分置换图G的L(p,q)-标记,使得最大标记最多为(2p-1)+ q(bc(G)-2),其中bc(G)是G的双斜数。由于任何二分图G的lambda(p,q)(G)> = p + q(bc(G)-2),所以上限最多为p-1远非最佳。

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