US 11,991,623 B2
Choosing core network types
Chih-Hsiang Wu, Taoyuan (TW)
Assigned to GOOGLE LLC, Mountain View, CA (US)
Appl. No. 17/285,850
Filed by GOOGLE LLC, Mountain View, CA (US)
PCT Filed Oct. 15, 2019, PCT No. PCT/US2019/056307
§ 371(c)(1), (2) Date Apr. 15, 2021,
PCT Pub. No. WO2020/081555, PCT Pub. Date Apr. 23, 2020.
Claims priority of provisional application 62/746,761, filed on Oct. 17, 2018.
Prior Publication US 2021/0377848 A1, Dec. 2, 2021
Int. Cl. H04W 48/18 (2009.01); H04W 48/12 (2009.01); H04W 76/20 (2018.01)
CPC H04W 48/18 (2013.01) [H04W 48/12 (2013.01); H04W 76/20 (2018.02)] 36 Claims
OG exemplary drawing
 
1. A method in a user device that supports an air interface for connecting to core networks (CNs) of different types, the method comprising:
receiving system information from a first base station or a second base station, wherein receiving the system information includes either (i) receiving the system information from the first base station after the user device selects a cell associated with the first base station, or (ii) receiving the system information, with a redirection command, from the second base station;
determining, based on the received system information, at least two CN types of respective CNs to which the first base station is connected;
choosing, and at a layer above a radio resource control (RRC) layer of a communication protocol stack, a CN type from among the at least two CN types; and
performing a mobility management (MM) procedure with a CN of the chosen CN type via the first base station.