Soft hand-off in cellular mobile communications networks
AssigneeFujitsu Limited
InventorBehzad Mohebbi
Life of this patent
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Abstract
In a cellular mobile communications network a mobile station is capable of receiving a downlink signal from each of a plurality of base stations and transmitting an uplink signal to the plurality of the base stations through a wireless channel. The mobile station produces a measure of signal quality of the downlink signals from the plurality of base stations to the mobile station and selects a base station from which the downlink signal shows a preferred signal quality. The mobile station transmits an uplink signal indicating the selected base station among the plurality of base stations for subsequent communications with the mobile station. Each base station processes the uplink signal to identify the selected base station from among the plurality of base stations.
Claims6
Control circuitry, for use in a base station which transmits a downlink signal to a mobile station and receives an uplink signal from the mobile station through a wireless channel, said mobile station capable of receiving downlink signals from other base stations as well, said control circuitry comprising:
- a controller to identify if the base station is a selected base station upon the base station receiving from the mobile station an uplink signal indicating the selected base station for a subsequent communication with the mobile station, said selected base station from which a downlink signal shows a preferred signal quality as received at the mobile station,
- wherein when said base station is the selected base station, said base station transmits the next downlink signal, otherwise said base station maintains the soft hand-off mode with the mobile station without sending the next downlink signal.
Dependencies are inferred from the claim text.