Dynamic Channel Assignment in Two-Dimensional Large-Scale Mobile Radio Systems

When a large pool of radio channels is available for use in a large-scale multiple base station mobile radio system, its assignment to individual base stations on the basis of instantaneous demand can improve systems performance. 1 - 3 Previous studies of coordinated dynamic channel assignment in one-dimensional systems (that may be used along an expressway or major air route for example) have shown that at blocking rates below 10 percent these assignment procedures produce increased channel occupancy over systems using the same channels but with channel allocation to each base station fixed. The most general form of dynamic channel assignment assumes that 1611 1612 T H E BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1972 any channel can be used at any base station. Efficient use of channels requires the simultaneous assignment (reuse) of the radio channel in radio coverage areas which are spaced as close together as possible without incurring excessive cochannel interference. Mobile radio systems which reuse channels within a metropolitan area often are referred to as small-cell or small coverage area systems. 3-0 The analysis of dynamic channel assignment systems which employ complex channel assignment algorithms appears to be intractable. For this reason, the performance of these systems is most readily determined by large-scale computer simulation. The overall system performance of two-dimensional dynamic channel assignment mobile radio systems is expected to be similar to that of the one-dimensional systems previously studied.