Automatic time-slot reassignment in a frequency reuse TDMA portable radio system

Measurement-based methods for the reassignment of a call to another time-slot with less cochannel interference on a time-division multiple access (TDMA) radio link are described and evaluated using a discrete-event simulation. Portable radio access, transfer triggering, and time-slot selection are modeled using an integrated radio and traffic call model. Results showed that link quality can be maintained with a low transfer rate, even under busy conditions. Regeneration of transfers was minimal. Performance was robust with respect to trigger measurement error, whereas the dynamic range of transmission quality measurement was found to be more critical in maintaining quality. Hysteresis reduced the rate of time-slot transfer while only minimally affecting quality