COMPARISON OF DIFFERENT DISTRIBUTED CHANNEL ASSIGNMENT ALGORITHMS FOR UFDMA
David Grace, Alister Graham Burr, Tim C. Tozer · 2007
Several different distributed channel assignment algorithms are compared using Unsupervised FDMA (UFDMA), a multiple access scheme for the land mobile radio environment. All algorithms make use of coexistence etiquettes which allow different users to share common frequency allocation. It is found that using the Least Interfered Channel (LIC) with call reassignment provides considerably better performance than LIC, and LIC better than First Available (FA). A tight interference level threshold, at the transmitter, improves the performance of the FA algorithm, but it is much better to use a loose interference threshold with the LIC algorithms. 1 Introduction Distributed channel assignment algorithms are gaining considerable attention as increasing cellular traffic requires the use of smaller and smaller cells, which mean that, due to localised fading, the port closest to the mobile may no longer be the most suitable transmitter to support the call. For this reason the Federal Communicat...