Evaluation and improvement of an autonomous access technique for a digital cordless telephone system

The author discusses the performance of an access technique in a digital cordless telephone system, often known as CT2 or telepoint. A telepoint system environment is simulated assuming typical fading statistics, and factors affecting access performance are examined. Due to contention among base stations, overall performance with spatially random access attempts is found to be very poor. Two modified access approaches, that can be used (while maintaining independence of ports´ response) individually or in combination to significantly improve performance, are proposed. The first approach is to allow the ports to select random time windows (or preassign the ports in time windows); the second is to retry access in case of a failed attempt. Using the two in combination virtually assures capture in no more than two access attempts for any reasonable number of ports. Hence, the inclusion of time windows in the system design may be a necessary option