초록 ▼

The present invention provides a method and an apparatus for using power of a pilot channel to control an output power from a transmitter, such as a base station transmitting spread spectrum signals. In one embodiment, a method for controlling an output power from a transmitter associated with a co

The present invention provides a method and an apparatus for using power of a pilot channel to control an output power from a transmitter, such as a base station transmitting spread spectrum signals. In one embodiment, a method for controlling an output power from a transmitter associated with a communication node (e.g., Node B) in a wireless network, such as a digital cellular network is provided. The method comprises extracting an indication of a pilot channel power from a portion of an output signal of the transmitter and controlling a control loop having one or more control devices in the transmitter based on the indication of a pilot channel power such that the pilot channel power stays substantially constant over a period of time. In this manner, using a closed power loop controller, a transmitter may overcome the problem of measuring the power of a non-constant spread spectrum signal and a traffic independent measure may control a cell size. Compared to a gain control loop, a relatively more precise control of the cell size may be provided using a significantly less measurement components.

대표청구항 ▼

I claim: 1. A method for controlling an output power of a spread spectrum signal having a non-constant power envelope that is transmitted from a transmitter associated with a communication node in a wireless network, the spread spectrum signal configured to support a plurality of channels including

I claim: 1. A method for controlling an output power of a spread spectrum signal having a non-constant power envelope that is transmitted from a transmitter associated with a communication node in a wireless network, the spread spectrum signal configured to support a plurality of channels including a pilot channel, the method comprising: extracting an indication of a pilot channel power used to transmit signals on the pilot channel from the spread spectrum signals transmitted by said transmitter; and adjusting a gain applied to the spread spectrum signal transmitted by the transmitter based on the indication of the pilot channel power such that the pilot channel power stays substantially constant when the output power of the spread spectrum signal having the non-constant power envelope varies. 2. A method, as set forth in claim 1, further comprising: setting a signal metric of at least one control device a control loop that is used to adjust the gain of said transmitter in response to the indication of a pilot channel power. 3. A method, as set forth in claim 2, wherein setting a signal metric further comprising: controlling at least one of gain and attenuation of said at least one control device. 4. A method, as set forth in claim 1, wherein controlling a control loop further comprising: controlling the output power of a base station transmitting spread spectrum signals. 5. A method, as set forth in claim 4, wherein controlling the output power of a base station further comprising: controlling the output power of a non-constant spread spectrum signal from said base station, wherein the non-constant spread spectrum signal is defined at least in part by a 3G mobile communication standard based on a Universal Mobile Telecommunications System protocol. 6. A method, as set forth in claim 1, further comprising: analyzing the modulation content of the output signal defined at least in part by a Universal Mobile Telecommunications System protocol to derive a pilot channel. 7. A method, as set forth in claim 6, further comprising: measuring the output power of the output signal from a non-constant power envelope to derive a measure of power for a cell in the wireless network. 8. A method, as set forth in claim 7, further comprising: setting the measure of power for said cell in the wireless network such that the output power from said transmitter covers a predetermined cell size. 9. A method, as set forth in claim 6, further comprising: determining a code domain power of the pilot channel to establish said control loop. 10. A method, as set forth in claim 9, further comprising: controlling a size of a cell in the wireless network based on a measure that is independent of traffic in a communication with a mobile device. 11. A transmitter associated with a communication node in a wireless network to communicate with a mobile device, the transmitter being configured to generate a spread spectrum signal that has an output power that carries in time, the spread spectrum signal configured to support a plurality of channels including a pilot channel, said transmitter comprising: an extractor to derive an indication of a pilot channel power used to transmit signals on the pilot channel from the spread spectrum signals transmitted by said transmitter; and a control device coupled to said extractor, said control device to control a control loop in said transmitter to adjust a gain applied to the spread spectrum signal transmitted by the transmitter based on the indication of the pilot channel power such that the pilot channel power stays substantially constant when the output power of the spread spectrum signal having the non-constant power envelope varies. 12. A transmitter, as set forth in claim 11, further comprising: a closed loop controller that sets a signal metric of said control device in response to the indication of a pilot channel power. 13. A transmitter, as set forth in claim 12, wherein said closed loop controller controls at least one of gain and attenuation of said control device. 14. A transmitter, as set forth in claim 11, wherein said transmitter is a base station transmitter that transmits spread spectrum signals. 15. A transmitter, as set forth in claim 14, wherein said spread spectrum signals include a non-constant spread spectrum signal defined at least in part by a 3G mobile communication standard based on a Universal Mobile Telecommunications System protocol.