Patent ID: 6408169
Filing Date: 2002-06-18
Classification: H01Q,H04B,H04W

Abstract:
A base station of a radio system wherein frequency channels of the radio system are divided by a TDMA principle into logical channels, the base station including an antenna arrangement comprising:a receiving arrangement to receive signals associated with a same logical channel via at least two antenna beams; a measuring arrangement to measure a signal level of the signals received by the antenna beams; and a controlling unit to select at least one of the antenna beams and to supply the signals received via the at least one of the antenna beams to a receiver unit of the base station arranged at a distance from the antenna arrangement; and the base station comprises a clock generating arrangement to generate a clock signal indicating a change of time slots and to supply the clock signal to the controlling unit, and a quality measuring arrangement to measure a quality of the signals received by the receiver unit from the antenna arrangement and to generate a quality signal responsive to a quality of the signals and to supply the quality signal to the controlling unit, the antenna arrangement comprises means for receiving said quality signal from the base station and the controlling unit includes a memory to store information included in the quality signal separately for each of the time slots, the controlling unit being responsive to the clock signal for retrieving the information stored into the memory for a specific time slot and for utilizing the retrieved information in the selection of the at least one of the antenna beams when the clock signal indicates a time for a new time slot to receive, wherein another antenna beam is selected for use if the quality signal received from the base station indicates that the quality of the signals are below a predetermined reference level.