US Patent No. 9,554,359

DYNAMIC ANTENNA TUNER SETTING FOR CARRIER AGGREGATION SCENARIOS


Patent No. 9,554,359
Issue Date January 24, 2017
Title Dynamic Antenna Tuner Setting For Carrier Aggregation Scenarios
Inventorship Tarik Tabet, Los Gatos, CA (US)
Navid Damji, Cupertino, CA (US)
Ming Hu, Sunnyvale, CA (US)
Christian W. Mucke, Sunnyvale, CA (US)
Vinay R. Majjigi, Sunnyvale, CA (US)
Syed A. Mujtaba, Santa Clara, CA (US)
Johnson O. Sebeni, Fremont, CA (US)
Assignee Apple Inc., Cupertino, CA (US)

Claim of US Patent No. 9,554,359

1. A method to adjust radio frequency circuitry in a wireless communication device, the method comprising the wireless communication
device at least:
receiving one or more downlink communications from a wireless network;
determining whether carrier aggregation is enabled;
when carrier aggregation is not enabled, adjusting the radio frequency circuitry based on default setting values; and
when carrier aggregation is enabled:
evaluating radio frequency conditions for a primary component carrier and for a secondary component carrier used for carrier
aggregation;

determining whether uplink communication is power constrained;
when uplink communication is power constrained, adjusting the radio frequency circuitry to maximize power transfer over a
set of radio frequencies through the primary component carrier; and

when uplink communication is not power constrained, adjusting the radio frequency circuitry to maximize power transfer over
a set of radio frequencies through a combination of the primary component carrier and the secondary component carrier,

wherein the wireless communication device determines whether uplink communication is power constrained based at least in part
on whether:

an uplink performance metric is less than an uplink performance threshold and a downlink performance metric is greater than
a downlink performance threshold, or

a downlink received signal strength exceeds a downlink signal strength threshold and a number of uplink random access channel
(RACH) failures occur.