US 12,342,418 B2
Steering of roaming PLMN list update and management
Sridhar Prakasam, Fremont, CA (US); Qi He, San Jose, CA (US); Rohit Matolia, Surat (IN); Shashanka Totadamane Ramappa, Bengaluru (IN); Nirlesh Koshta, Karntaka (IN); Xiangpeng Jing, Palo Alto, CA (US); Krisztian Kiss, Hayward, CA (US); Nitin Kuppelur, Bangalore (IN); Kavya Ravikumar, San Diego, CA (US); Rajkumar Krishnaperumal, Bangalore (IN); Pradeep Pangi, Bengaluru (IN); Karthik Anantharaman, Cupertino, CA (US); Alosious Pradeep Prabhakar, Singapore (SG); Vijay Venkataraman, San Jose, CA (US); Lester Chan, Cupertino, CA (US); and Madhusudhan Cheripally, Bengaluru (IN)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on May 26, 2023, as Appl. No. 18/324,706.
Application 18/324,706 is a continuation of application No. 17/393,063, filed on Aug. 3, 2021, granted, now 11,696,114.
Claims priority of application No. 202041034686 (IN), filed on Aug. 12, 2020.
Prior Publication US 2023/0388775 A1, Nov. 30, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 8/12 (2009.01); H04W 8/20 (2009.01); H04W 8/28 (2009.01); H04W 84/04 (2009.01)
CPC H04W 8/12 (2013.01) [H04W 8/20 (2013.01); H04W 8/28 (2013.01); H04W 84/042 (2013.01)] 28 Claims
OG exemplary drawing
 
1. A method for remaining on a visited public land mobile network (PLMN), comprising:
when steering of roaming (SoR) information is received and a security check is successful, replacing, during visiting PLMN (VPLMN) registration and when the SoR information contains a list of preferred PLMN/access technology combinations, highest priority entries in an Operator Controlled PLMN Selector with Access Technology list stored in a user equipment (UE) with the list of preferred PLMN/access technology combinations;
wherein, when the UE is in an automatic network selection mode and determines that there is a higher priority PLMN than a current VPLMN, performing at least one of:
releasing a current N1 network access stratum (NAS) signaling connection locally and attempting to obtain service on a higher priority PLMN by acting as if a timer that controls periodic attempts has expired; or
maintaining the current N1 NAS signaling connection locally if a protocol data unit (PDU) session is established.