	US 7,577,411 B2
	Mobile station access and idle state antenna tuning systems and methods
Henry Chang, San Diego, Calif. (US); Gregory Poilasne, San Diego, Calif. (US); and Jorge Fabrega-Sanchez, San Diego, Calif. (US)
Assigned to Kyocera Corporation, Kyoto (Japan)
Filed on Feb. 17, 2005, as Appl. No. 11/62,242.
Prior Publication US 2006/0183443 A1, Aug. 17, 2006
Int. Cl. H04B 1/18 (2006.01)

U.S. Cl. 455—193.1 [455/248.1; 455/125]

16 Claims

1. A method for tuning a wireless communication device antenna matching circuit, the method comprising the steps of:

sending a first access probe at a first transmit power level to a base station;

receiving a receive signal quality indicator;

comparing the receive signal quality indicator with a predetermined threshold to determine whether a first condition is satisfied, wherein the first condition is satisfied if the receive signal quality is below the predetermined threshold, the first condition is not satisfied if the receive signal quality is above the predetermined threshold;

comparing a number of access probes with a threshold number to determine whether a second condition is satisfied, where the number of access probes is an integer value from zero to a predetermined value, the access probes performed by the wireless communication device, wherein the second condition is satisfied if the number of access probes is below the threshold number, the second condition is not satisfied if the number of access probes is above the threshold number; and

adjusting an impedance match of the antenna matching circuit by performing at least one of:

shifting an antenna efficiency toward a receive frequency if the first condition is not satisfied and the second condition is satisfied, and

shifting the antenna efficiency toward a transmit frequency if a first state or a second state exists, said first state exists if the first condition is not satisfied, the second condition is not satisfied, and a transmit power is greater than a maximum transmit power, said second state exists if the first condition is satisfied and the second condition is not satisfied.