Cellular system employing base station transmit diversity according to transmission quality level
First Claim
1. In a radio communications system having at least one fixed base station and a plurality of remote stations, the base station transmitting signals to the remote stations over one or more forward radio channels each forward channel being assigned to at least one of the remote stations, and the remote stations transmitting signals to the base station over one or more reverse radio channels, a method for improving the quality of transmissions from the base station to a remote station comprising:
- monitoring the quality of the signals received over a reverse channel from a selected one of the plurality of remote stations;
identifying a forward channel associated with the selected remote station;
receiving from the selected remote station a report of the quality of signals received by the selected remote station from the base station on the forward channel; and
employing diversity transmission for transmitting signals from the base station to the selected remote station over the identified forward channel in response to the monitored quality of the received signals and the report received from the selected remote station.
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Accused Products
Abstract
A cellular system has base stations in which diversity transmission is controllably employed to improve voice communications as needed. Normal signal transmission is employed in each voice channel unless it is detected that quality has dropped to a point where diversity transmission is needed to enhance the quality. When it is detected that a voice channel needs diversity transmission, a diversity (delayed) signal is automatically transmitted for that channel over an independent path. A common diversity transmitter is employed for all channels, whereas individual transmitters are employed for the normally transmitted signals in the respective voice channels.
59 Citations
24 Claims
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1. In a radio communications system having at least one fixed base station and a plurality of remote stations, the base station transmitting signals to the remote stations over one or more forward radio channels each forward channel being assigned to at least one of the remote stations, and the remote stations transmitting signals to the base station over one or more reverse radio channels, a method for improving the quality of transmissions from the base station to a remote station comprising:
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monitoring the quality of the signals received over a reverse channel from a selected one of the plurality of remote stations; identifying a forward channel associated with the selected remote station; receiving from the selected remote station a report of the quality of signals received by the selected remote station from the base station on the forward channel; and employing diversity transmission for transmitting signals from the base station to the selected remote station over the identified forward channel in response to the monitored quality of the received signals and the report received from the selected remote station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. In a radio communications system having a fixed base station and a plurality of remote stations, the base station transmitting signals to the remote stations over one or more forward radio channels each forward channel being assigned to at least one of the remote stations, and the remote stations transmitting signals to the base station over one or more reverse radio channels, the base station having a plurality of primary transmitters each assigned to at least one forward channel and at least one diversity transmitter, the diversity transmitters being fewer in number than the primary transmitters, a method for improving the quality of transmissions from the base station to a remote station comprising:
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monitoring the quality of the radio signal path between the base station and a selected one of the plurality of remote stations; identifying the forward channel associated with the monitored radio signal path associated with the selected remote station; assigning a diversity transmitter of the at least one diversity transmitters to the identified forward channel to augment the assigned primary transmitter for the identified forward channel in response to the monitored quality of the radio signal path; and transmitting signals from the base station to the selected remote station over the identified forward channel using both the primary and the assigned diversity transmitters simultaneously. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification