Time Slot Assignment for Cellular SDMA/TDMA Systems with Adaptive Antennas

Yoshitaka HARA  Yunjian JIA  Toshihisa NABETANI  Shinsuke HARA  

IEICE TRANSACTIONS on Communications   Vol.E87-B    No.4    pp.858-865
Publication Date: 2004/04/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technology
SDMA,  slot assignment,  adaptive arrays,  land mobile radio cellular systems,  wireless communication,  

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This paper presents time slot assignment algorithms applicable to uplink of space division multiple access (SDMA)/time division multiple access (TDMA) systems with adaptive antennas. In the time slot assignment process for a new terminal in a cell, we consider not only the signal quality of the new terminal but also that of active terminals in the same cell. Intra-cell hand over is performed for an active terminal when its signal quality deteriorates. We evaluate the blocking and forced termination probabilities for pure TDMA systems, sectorized systems, and SDMA/TDMA systems in cellular environments by computer simulations. The simulation results show that the SDMA/TDMA systems have much better performance than the pure TDMA and sectorized systems.