US 9,814,009 B2
Multiple carrier attachment establishment and maintenance
Scott Bartlett, Oakland, CA (US)
Assigned to Google LLC, Mountain View, CA (US)
Filed by Google Inc., Mountain View, CA (US)
Filed on Aug. 1, 2014, as Appl. No. 14/450,031.
Prior Publication US 2016/0037470 A1, Feb. 4, 2016
Int. Cl. G01R 31/08 (2006.01); H04L 1/00 (2006.01); H04W 60/00 (2009.01); H04W 36/00 (2009.01); H04W 88/06 (2009.01); H04W 76/02 (2009.01)
CPC H04W 60/005 (2013.01) [H04W 36/0022 (2013.01); H04W 36/0066 (2013.01); H04W 76/025 (2013.01); H04W 88/06 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method, executed by a mobile station (MS) attached to a supporting wireless wide area network (WWAN), for attaching to a target WWAN while maintaining the attachment to the supporting WWAN, the method comprising:
transmitting, via a physical uplink channel with a radio access network (RAN) of the supporting WWAN, an attach request message to be forwarded by a core network gateway of the supporting WWAN to a generic access network controller of a generic access network (GAN) of the target WWAN via another network;
receiving, via a physical downlink channel with the RAN of the supporting WWAN, an attach accept message forwarded by the core network gateway of the supporting WWAN from the generic access network controller of the GAN of the target WWAN via the another network; and
after receiving the attach accept message, transmitting, via the physical uplink channel with the RAN of the supporting WWAN, a handover request message to be forwarded by the core network gateway of the supporting WWAN to the generic access network controller of the GAN of the target WWAN via the another network.