A Binary Time-Slot Assignment Algorithm for Time-Division Multiplexed (TDM) Hierarchical Switching Systems (HSS)

Boseob KWON  Kaoru SEZAKI  Young Man KIM  Hyunsoo YOON  

IEICE TRANSACTIONS on Communications   Vol.E80-B   No.5   pp.770-778
Publication Date: 1997/05/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Satellite Communication
communication networks and services,  switching and communication processing,  communication software,  

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A Time-Division Multiplexed (TDM) Hierarchical Switching System (HSS), proposed by Eng and Acampora [5], provides any size of bandwidth for a number of subscribers by allocating proper number of time-slots in a frame. In this paper, we present a binary time-slot assignment (TSA) algorithm by which a proper size of time-slots in the frame are allocated to each subscriber so as to meet its bandwidth requests. The time complexity of the proposed algorithm is O(NLlog2 L) in which N is the number of input/output links of the central switch and L is the number of time-slots allotted to each link in the frame. As the authors know, the most efficient algorithm proposed in the literature has time complexity of O(min(L, M2)min(N, M)M2), in which M is the number of subscribers that is larger than N in TDM/HSS system. To give a clear idea of relative efficiency between two algorithms, let us give a typical situation of M = L = O(N2). In this configuration our algorithm makes a significant improvement in time complexity by the order of O(M2/log2M).