Communication system, primary station and method of transmit power control
AssigneeKoninklijke Philips Electronics N.V.
InventorsMatthew Baker, Timothy Moulsley
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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).
Claims22
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.
A communication system (50) comprising a primary station (100) and a plurality of secondary stations (200), each secondary station (200) comprising:
- 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.
A primary station (100) for use in a communication system (50) comprising a plurality of secondary stations (200), the primary station comprising:
- 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.
Dependencies are inferred from the claim text.