Closed-loop power controlled radio communication system
AssigneeKoninklijke Philips Electronics N.V.
InventorsMatthew Baker, Timothy Moulsley
Life of this patent
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Abstract
In a radio communication system (50) employing closed loop power control a primary station (100) adjusts its transmit power in response to control information including power control commands received from a secondary station (100). If the primary station (100) fails to obey the power control commands the secondary station modifies the control information and the primary station (100) uses the modified control information to adapt a characteristic of a transmission.
Claims19
A secondary station (200) for use in a communication system comprising a primary station (100) and a secondary station (200), the secondary station (200) comprising:
- receiver means (240) for receiving a first signal transmitted by the primary station (100);
- measurement means (250) for measuring a first characteristic of the received first signal;
- processing means (260) for deriving power control commands from the measured first characteristic,
- transmitter means (210) for transmitting control information comprising at least the power control commands to the primary station (100);
- further comprising control means (270) responsive to the primary station (100) failing to adjust its transmit power in compliance with the transmitted power control commands for modifying a parameter of the control information transmitted to the primary station (100).
A communication system (50) as claimed in claim 10, wherein the primary station control means (150) is adapted to generate an indication for transmission in response to failing to adjust the transmit power of the first signal in compliance with the received power control commands.
A primary station (100) for use in a communication system (50) comprising a primary station (100) and a secondary station (200), the primary station (100) comprising:
- transmitter means (110) for transmitting a first signal;
- receiver means (140) for receiving power control commands;
- control means (150) for adjusting the transmit power of the first signal in compliance with the received power control commands provided that the adjustment is within the contemporaneous capability of the primary station (100);
- wherein the control means (150) is adapted to generate an indication for transmission in response to failing to adjust the transmit power of the first signal in compliance with the received power control commands.
A method of operating a communication system (50) comprising a primary station (100) and a secondary station (200), the method comprising:
- transmitting a first signal from the primary station (100);
- at the secondary station (200),
- receiving the first signal;
- while receiving the first signal, measuring a first characteristic of the received first signal, deriving power control commands from the measured first characteristic, and transmitting control information comprising at least the power control commands;
- at the primary station (100),
- receiving the power control commands;
- adjusting the transmit power of the first signal in compliance with the received power control commands provided that the adjustment is within the contemporaneous capability of the primary station (100);
- further comprising,
- at the secondary station (200), in response to the primary station (100) failing to adjusting the transmit power in compliance with the received power control commands, modifying a parameter of the control information transmitted to the primary station (100), and
- at the primary station (100), in response to receiving the modified control information, adapting a characteristic of a transmission.
Dependencies are inferred from the claim text.