RESOURCE-ALLOCATION FOR CELLULAR RADIO SYSTEMS

High terminal traffic densities are expected in urban multiuser radio systems. An efficient allocation of resources is the key to high syste m capacity. In this paper, a distributed dynamic resource allocation ( DDRA) scheme based on local signal and interference measurements is pr oposed for multiuser radio networks. It offers ''soft capacity'' for t ime division multiple access (TDMA) and frequency division multiple ac cess (FDMA) systems, bounded above by N per base station, where N is t he total number of channels in the system. The decisions are made loca l to a terminal and its base and are essentially independent of the re st of the system. A distributed dynamic channel assignment scheme is u sed to assign channels to new calls. This scheme assigns a channel tha t offers the maximum carrier to interference ratio (CIR) to a new call . A distributed constrained power control (DCPC) scheme based on CIR m easurements is used for power control. The channel assignment scheme a nd the power control scheme are coupled to obtain an interactive resou rce allocation scheme. We compare the capacity of a system which uses the distributed dynamic resource allocation scheme described above wit h the capacity of a system which uses the channel assignment scheme al one. The system capacity is measured by simulation as the number of te rminals that can be served by the system with a CIR above an acceptabl e minimum. Our results for a one-dimensional cellular system show that coupling the channel assignment scheme with power control offers a hi gher system capacity than when the channel assignment scheme is used a lone. Simulations were also used to show the effect of varying the max imum transmitter power on system capacity.