Dynamic Reuse Partitioning Within Cells Based on Local Channel and Arrival Rate Fluctuations

It is possible to improve the spectral efficiency of cellular systems by dynamically repartitioning the available bandwidth between different interfering and noninterfering subareas within and among sectors. Here, we investigate the problem of maximizing the expected system throughput in a two-sector area by dynamic bandwidth partitioning between two transmission modes: 1) reusing bandwidth in the low-interference area near either of the base stations and 2) using bandwidth for macrodiversity or single-base station transmission to avoid interference. Mode 2 is typically useful for giving users near the cell border higher bit rates. The suggested solution adapts the bandwidth partitioning to reflect local transmission capacities and bandwidth demands. Thus, it automatically decides on whether both transmission modes should be used and how much bandwidth should be used in each mode. The solution requires only limited knowledge of the future arrival rates and channel qualities and uses probability theory to find a robust bandwidth partitioning. Finally, we discuss access control and when to switch a user between the transmission modes to achieve high spectral efficiency and some minimum average quality of service.