Signal transmission parameter control using channel sounding
First Claim
1. A method for correcting transmission parameters comprising:
- a base station wirelessly communicating with a client station;
the base station transmitting to the client station a sounding command to instruct the client station to transmit a sounding signal;
the base station receiving in an uplink the sounding signal from the client station;
the base station determining channel characteristics based at least partly on the sounding signal;
the base station determining one or more signal transmission correction parameters for at least one of timing adjustment, power adjustment, or frequency adjustment based at least partly on the determined channel characteristics;
the base station transmitting in a downlink to the client station a message including the one or more correction parameters;
the base station transmitting a second sounding command to the client station in order to perform a beamforming adjustment;
the base station receiving in an uplink a second sounding signal from the client station; and
the base station performing a beamforming adjustment for an antenna of the base station based at least partly on the second sounding signal.
4 Assignments
0 Petitions
Accused Products
Abstract
A base station (BTS) may instruct a client station (CS) to transmit sounding signals that the BTS may analyze to determine what adjustments, such as power, time, and/or frequency adjustment(s) should be made by the CS. The BTS may control when and how the sounding signals are sent by the CS. This helps reduce the possibility of adjustment signals transmitted by two or more CSs colliding. Thus, sounding signals transmitted by the CS in response to a request by the BTS can be received by the BTS with higher a probability of success. This permits the BTS to more accurately characterize the channel and to provide better adjustment of power level, frequency offset, and/or timing offset for more optimal communication. Such techniques can be used to reduce bit error rates and to improve the overall signal to noise ratio encountered by the system.
12 Citations
13 Claims
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1. A method for correcting transmission parameters comprising:
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a base station wirelessly communicating with a client station; the base station transmitting to the client station a sounding command to instruct the client station to transmit a sounding signal; the base station receiving in an uplink the sounding signal from the client station; the base station determining channel characteristics based at least partly on the sounding signal; the base station determining one or more signal transmission correction parameters for at least one of timing adjustment, power adjustment, or frequency adjustment based at least partly on the determined channel characteristics; the base station transmitting in a downlink to the client station a message including the one or more correction parameters; the base station transmitting a second sounding command to the client station in order to perform a beamforming adjustment; the base station receiving in an uplink a second sounding signal from the client station; and the base station performing a beamforming adjustment for an antenna of the base station based at least partly on the second sounding signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus comprising:
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a transmitter configured to process signals for transmission to a client station over a wireless transmission medium; a receiver configured to receive at least a sounding signal from the client station over the wireless transmission medium; and a control circuit in communication with the transmitter and the receiver, wherein the control circuit is configured to; cause the transmitter to request the client station to transmit the sounding signal over a wireless transmission medium; determine channel characteristics associated with the sounding signal; determine one or more signal transmission correction parameters for at least one of timing adjustment, power adjustment, or frequency adjustment based at least partly on the determined channel characteristics; cause the transmitter to transmit a ranging response message including the one or more correction parameters; transmit via the transmitter a second sounding command to the client station in order to perform a beamforming adjustment; receive via the receiver a second sounding signal from the client station; and perform a beamforming adjustment for an antenna of the base station based at least partly on the second sounding signal. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification