Dynamic Channel Assignment in Shotgun Cellular Systems.pdfVIP

Appears in Proc. of 1999 IEEE Radio and Wireless Conference (RAWCON99), pg. 147–150. Dynamic Channel Assignment in Shotgun Cellular Systems Timothy X Brown1 Dept. of Electrical and Computer Engineering University of Colorado, Boulder, CO 80309-0530 Tel: (303) 492–1630 Fax: (303) 492–1112 timxb@colorado.edu Abstract This paper analyzes dynamic channel assignment in cellular systems where the base stations are placed at random. Using a simple dynamic channel assignment algorithm, random systems are compared to an ideal hexagonal systems. Under log-normal shadow fading the random system has capacity within 1dB of the hex- agonal system. This paper looks at both the uplink and downlink and finds that performance is similar to previous downlink analysis. Thus, at a modest cost in performance, deployment effort is greatly reduced. 1. Introduction 2. Model: Current cellular and PCS systems, with their small cell In the shotgun system, base stations are distributed as a sizes, depart significantly from the ideal hexagonal lay- 2-D Poisson process where the average density of sta- out due to terrain variations, difficulties in site acquisi- tions is λ and the probability of a base station in a small tion, and space variations in mobile station density. In area dA is λdA. All base stations have identical transmit quickly deployed ad hoc military or emergency commu- power, antenna gains, etc., and the path loss is an inverse nication systems, little or no planning may be possible. power