US 9,813,916 B2
Carrier aggregation using unlicensed frequency bands
Tarik Tabet, Los Gatos, CA (US); Dawei Zhang, Saratoga, CA (US); and Wen Zhao, San Jose, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Dec. 20, 2016, as Appl. No. 15/384,652.
Application 15/384,652 is a continuation of application No. 14/095,277, filed on Dec. 3, 2013, granted, now 9,554,283.
Prior Publication US 2017/0105125 A1, Apr. 13, 2017
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 16/14 (2009.01); H04W 72/04 (2009.01)
CPC H04W 16/14 (2013.01) [H04W 72/0453 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method, comprising:
at a mobile station:
establishing a primary carrier with a base station according to a cellular communication technology, wherein the primary carrier is on a licensed frequency band;
receiving, from the base station, configuration information of first and second secondary carriers, wherein the first and second secondary carriers are configured according to the cellular communication technology, wherein the first and second secondary carriers are on an unlicensed frequency band, and wherein the first and second secondary carriers are initially inactive;
performing one or more first measurements on at least the first secondary carrier;
providing the one or more first measurements to the base station;
receiving an activation indication for the first secondary carrier in response to providing the one or more first measurements;
performing one or more second measurements of at least the first secondary carrier;
providing the one or more second measurements to the base station; and
in response to providing the one or more second measurements, performing handover from the first secondary carrier to the second secondary carrier, wherein said performing handover comprises:
receiving a deactivation indication for the first secondary carrier; and
receiving an activation indication for the second secondary carrier.