Communication system, primary station and method of transmit power control
First Claim
Patent Images
1. A method of transmit power control in a communication system (50) comprising a primary station (100) and a plurality of secondary stations (200), the method comprising at each secondary station (200):
- receiving a first signal transmitted by the primary station (100);
measuring a parameter of the received first signal;
deriving a second signal from the measured parameter;
transmitting the second signal; and
at the primary station (100);
transmitting the first signal;
receiving the second signals;
deriving a power control signal from the received second signals;
controlling the transmit power of the first signal in accordance with the power control signal;
wherein the transmission of the second signals comprises a plurality of the secondary stations (200) transmitting common signals in a common time period in a common frequency allocation.
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Abstract
A transmit power control scheme for use in point-to-multipoint communication uses a random access channel for power control signals transmitted by the receiving stations (200).
38 Citations
22 Claims
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1. A method of transmit power control in a communication system (50) comprising a primary station (100) and a plurality of secondary stations (200), the method comprising at each secondary station (200):
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receiving a first signal transmitted by the primary station (100);
measuring a parameter of the received first signal;
deriving a second signal from the measured parameter;
transmitting the second signal; and
at the primary station (100);
transmitting the first signal;
receiving the second signals;
deriving a power control signal from the received second signals;
controlling the transmit power of the first signal in accordance with the power control signal;
wherein the transmission of the second signals comprises a plurality of the secondary stations (200) transmitting common signals in a common time period in a common frequency allocation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A communication system (50) comprising a primary station (100) and a plurality of secondary stations (200), each secondary station (200) comprising:
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means (240) for receiving a first signal transmitted by the primary station (100);
means (250) for measuring a parameter of the received first signal;
means (250) for deriving a second signal from the measured parameter;
means (210) for transmitting the second signal; and
the primary station (100) comprising;
means (110) for transmitting the first signal;
means (140) for receiving the second signals;
means (150) for deriving a power control signal from the received second signals;
means (160) for controlling the transmit power of the first signal in accordance with the power control signal;
wherein the means (210) for transmitting the second signals are adapted to transmit a common signal in a common time period in a common frequency allocation. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A primary station (100) for use in a communication system (50) comprising a plurality of secondary stations (200), the primary station comprising:
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means (110) for transmitting a first signal;
means (140) for receiving from secondary stations (200) second signals comprising a plurality of common signals received in a common time period in a common frequency allocation;
means (150) for deriving a power control signal from the received second signals;
means (160) for controlling the transmit power of the first signal in accordance with the power control signal.
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Specification