Patent ID: 6839333

Claim:
A TDMA radio communication system combining time and frequency division duplex, said system comprising: a first base station having a first radio coverage area and transmitting in first down link frames on a first carrier frequency and receiving in first uplink frames, which have no time overlap with said first downlink frames, on a second, different carrier frequency; a second base station having a second radio coverage area and transmitting in second down link frames on said first carrier frequency and receiving in second uplink frames, which have no time overlap with said second downlink frames, on said second carrier frequency, said second radio coverage area partially overlapping said first radio coverage area, and said second base station being geographically separated from said first base station in order to prevent transmissions from either base station disturbing reception on radio terminals on the other base station; a network controller synchronizing transmission from said first and second base stations and offsetting transmission from said second base station by one downlink frame relative to transmission from said first base station, wherein mobile radio terminals monitor channel quality and offset on downlink frames from both base stations for performing mobile radio terminal controlled dynamic channel selection in connection with call setup and handover.