Communication system, primary station and method of transmit power control
First Claim
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1. A method of transmit power control in a communication system comprising a primary station and a plurality of secondary stations, the method comprising the steps of:
- at each secondary station;
receiving a first signal transmitted by the primary station;
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;
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 transmitting of the second signal takes place with a sub-unity probability such that there is a functional relationship between the sub-unity probability and the measured parameter of the first received signal and wherein parameters determining said functional relationship are signaled to a secondary station of the plurality of secondary stationswherein at each secondary station transmitting second signal comprises selecting a combination of spreading code, time period and frequency allocation from a plurality of combinations, the selection being dependent on a value of the measured parameter.
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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).
13 Citations
18 Claims
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1. A method of transmit power control in a communication system comprising a primary station and a plurality of secondary stations, the method comprising the steps of:
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at each secondary station; receiving a first signal transmitted by the primary station; 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; 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 transmitting of the second signal takes place with a sub-unity probability such that there is a functional relationship between the sub-unity probability and the measured parameter of the first received signal and wherein parameters determining said functional relationship are signaled to a secondary station of the plurality of secondary stations wherein at each secondary station transmitting second signal comprises selecting a combination of spreading code, time period and frequency allocation from a plurality of combinations, the selection being dependent on a value of the measured parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A communication system comprising a primary station and a plurality of secondary stations, each secondary station comprising:
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a receiver configured to receive a first signal transmitted by the primary station; a processor adapted to measure a parameter of the received first signal; the processor being further adapted to derive a second signal from the measured parameter; a transmitter configured to transmit the second signal; and the primary station comprising; a transmitter configured to transmit the first signal; a receiver configured to receive the second signals; a processor adapted to derive a power control signal from the received second signals; the processor being further adapted to control the transmit power of the first signal in accordance with the power control signal; wherein the transmitting of the second signal takes place with a sub-unity probability such that there is a functional relationship between the sub-unity probability and the measured parameter of the first received signal and wherein parameters determining said functional relationship are signaled to a secondary station of the plurality of secondary stations wherein the processor is further adapted to select a combination of spreading code, time period and frequency allocation from a plurality of combinations, the selection being dependent on a value of the measured parameter. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A primary station for use in a communication system comprising a plurality of secondary stations, the primary station comprising:
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a transmitter configured to transmit a first signal; a receiver configured to receive from secondary stations second signals; a processor adapted to derive a power control signal from the received second signals; the processor being further adapted to control the transmit power of the first signal in accordance with the power control signal; wherein the transmitting of the second signal takes place with a sub-unity probability such that there is a functional relationship between the sub-unity probability and the measured parameter of the first received signal and wherein parameters determining said functional relationship are signaled to a secondary station of the plurality of secondary stations, and wherein the second signals received from the secondary stations are transmitted by selecting a combination of spreading code, time period and frequency allocation from a plurality of combinations, the selection being dependent on a value of the measured parameter.
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Specification
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Current AssigneeKoninklijke Philips N.V.
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Original AssigneeKoninklijke Philips N.V.
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InventorsBaker, Matthew P. J., Moulsley, Timothy J.
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Primary Examiner(s)VIANA DI PRISCO, GERMAN
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Application NumberUS11/568,544Publication NumberTime in Patent Office3,715 DaysField of Search455/69, 455/423, 455/522, 370/332, 370/431, 370/318US Class Current1/1CPC Class CodesH04W 52/327 Power control of multicast ...
