Patent ID: 8744014

Claim:
A cellular network comprising: a plurality of base stations each corresponding to a cell, each base station employing three directional antennas transmitting in three different directions using three different frequency bands, respectively, the three frequency bands used by the antennas of all base stations being the same three frequency bands; and at least one server connected to the plurality of base stations, wherein the server controls at least one group of three neighboring base stations among the plurality of base stations to coordinate their transmission within at least one of the three frequency bands in at least some time slots, wherein for each base station, the three directional antennas include a first antenna transmitting in a first direction using a first frequency band, a second antenna transmitting in a second direction using a second frequency band, and a third antenna transmitting in a third direction using a third frequency band, and wherein the server controls the at least one group of three base stations to coordinate their transmission within all three frequency bands during the at least some time slots, wherein the server controls a first group of three neighboring base stations among the plurality of base stations to coordinate their transmission within all three frequency bands in a first time slot, controls a second group of three neighboring base stations among the plurality of base stations to coordinate their transmission within all three frequency bands in a second time slot, and controls a third group of three neighboring base stations among the plurality of base stations to coordinate their transmission within all three frequency bands in a third time slot, the first, second and third group of three base stations have one common base station, wherein the first, second and third time slots are consecutive time slots.