A combined channel assignment mechanism for hierarchical cellular systems1This paper was presented at ICUPC'97, San Diego, CA, USA.1

Authors:
Kuen-Rong Lo;Chung-Ju Chang;Cooper Chang;C.Bernard Shung
Affiliations:
Department of Electronics Engineering, National Chiao Tung University, Hsinchu 300, Taiwan, ROC and Network Planning Department, Telecommunications Laboratories, Chunghwa Telecom Co. Ltd, Taoyuan ...;Department of Communication Engineering, National Chiao Tung University, Hsinchu 300, Taiwan, ROC;Department of Communication Engineering, National Chiao Tung University, Hsinchu 300, Taiwan, ROC;Department of Electronics Engineering, National Chiao Tung University, Hsinchu 300, Taiwan, ROC
Venue:
Computer Communications
Year:
1998

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Abstract

This paper proposes a combined channel assignment (CCA) mechanism for hierarchical cellular systems with overlaying macrocells and overlaid microcells. The proposed CCA mechanism combines overflow, underflow, and reversible schemes, where new or handoff calls having no available channel to use in the overlaid microcell can overflow to use free channels in the overlaying macrocell, handoff calls from a neighboring macrocell can underflow to use free channels in the overlaid microcell, and handoff attempts from a macrocell-only region to an overlaid microcell can be reversed to use free channels in the microcell. We apply the CCA mechanism in two different hierarchical cellular systems of Strip type and Manhattan type and compare the CCA with the overflow channel assignment (OCA) scheme. Simulation results show that the CCA mechanism outperforms the OCA scheme by once in forced termination probability, by several times in new call blocking probability, and by 4.7% in system utilization for a hierarchical cellular system, and the CCA mechanism is more suitable for the Manhattan type than for the Strip type.