A TDMA radio communication system combines time and frequency division
duplex. It includes a first base station transmitting in first downlink
frames on a first carrier frequency in a first frequency band and
receiving in first uplink frames, which have no time overlap with the
first downlink frames, on a second carrier frequency in a second frequency
band, which has no frequency overlap with the first frequency band. The
system also includes a second base station, which has partially
overlapping radio coverage area with the first base station, but is
geographically separated from the first base station in order to avoid
transmission from one base station disturbing reception from radio
terminals on the other base station. The second base station transmits in
second downlink frames on the first carrier frequency and receives in
second uplink frames, which have no time overlap with the second downlink
frames, on the second carrier frequency. The first and second downlink
frames are offset to have no time overlap. A network controller
synchronizes transmission from the first and second base stations.
