US 11,991,565 B2
Dual radio operation between access systems using 3GPP radio access technology
Alexandre Saso Stojanovski, Paris (FR); and Muthaiah Venkatachalam, Beaverton, OR (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Sep. 30, 2021, as Appl. No. 17/490,211.
Application 17/490,211 is a continuation of application No. 16/867,357, filed on May 5, 2020, granted, now 11,172,413.
Application 16/867,357 is a continuation of application No. 15/766,052, granted, now 10,652,786, issued on May 12, 2020, previously published as PCT/US2016/054125, filed on Sep. 28, 2016.
Claims priority of provisional application 62/238,064, filed on Oct. 6, 2015.
Prior Publication US 2022/0022105 A1, Jan. 20, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 36/00 (2009.01); H04W 36/14 (2009.01); H04W 76/28 (2018.01); H04W 88/06 (2009.01); H04L 61/4588 (2022.01); H04L 61/5007 (2022.01); H04W 8/26 (2009.01); H04W 36/16 (2009.01); H04W 60/04 (2009.01)
CPC H04W 36/0022 (2013.01) [H04W 36/0027 (2013.01); H04W 36/0069 (2018.08); H04W 36/14 (2013.01); H04W 76/28 (2018.02); H04W 88/06 (2013.01); H04L 61/4588 (2022.05); H04L 61/5007 (2022.05); H04W 8/26 (2013.01); H04W 36/165 (2013.01); H04W 60/04 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising processing circuitry, wherein the processing circuitry is configured to cause a user equipment (UE) to:
perform attachment to a first core network of a first system via a first cell, wherein the first cell corresponds to a first radio access technology (RAT);
perform attachment to a second core network of a second system via a second cell, wherein the second cell corresponds to a second RAT, different from the first RAT;
determine whether internet protocol (IP) address preservation is required in association with moving a session from the first core network to the second core network;
select a first procedure type to perform to move the session from the first core network to the second core network based on a determination that IP address preservation is required, wherein the first procedure type is selected when IP address preservation is required and a second procedure type is selected when IP address preservation is not required; and
move the session from the first core network to the second core network according to the first procedure type which enables the second core network to retrieve a packet gateway (PGW) already selected by the first core network.