US 12,177,212 B2
Enhanced N17 interface between IMS network and 5G-EIR
A. Karl Corona, Maple Valley, WA (US); Jim Udom, Woodinville, WA (US); and Shujaur Mufti, Snoqualmie, WA (US)
Assigned to T-Mobile USA, Inc., Bellevue, WA (US)
Filed by T-Mobile USA, Inc., Bellevue, WA (US)
Filed on Oct. 15, 2020, as Appl. No. 17/071,664.
Prior Publication US 2022/0124091 A1, Apr. 21, 2022
Int. Cl. H04L 9/40 (2022.01); H04L 65/1016 (2022.01); H04L 65/1066 (2022.01); H04L 65/1104 (2022.01); H04L 67/02 (2022.01); H04W 8/04 (2009.01); H04W 84/04 (2009.01)
CPC H04L 63/0876 (2013.01) [H04L 65/1016 (2013.01); H04L 65/1066 (2013.01); H04L 65/1104 (2022.05); H04L 67/02 (2013.01); H04W 8/04 (2013.01); H04W 84/042 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method comprising:
receiving, at a Serving-Call Session Control Function (S-CSCF), a Session Initiation Protocol (SIP) INVITE message associated with a user equipment (UE);
sending, based at least in part on the SIP INVITE message and to a Home Subscriber Server (HSS), a first request for subscriber data;
receiving, from the HSS and based at least in part on the first request, the subscriber data, the subscriber data including a permanent equipment identifier (PEI) associated with the UE;
sending, by the S-CSCF, based at least in part on the subscriber data, and to a Fifth-Generation (5G) Equipment Identity Register (EIR) via an N17′ interface, a second request for identity data,
wherein the endpoints of the N17′ interface are the S-CSCF and the 5G EIR and the second request includes the PEI, and
wherein the sending comprises determining to send the second request via the N17′ interface rather than a S13 Diameter interface;
receiving, by the S-CSCF, based at least in part on the second request, and from the 5G-EIR via the N17′ interface, the identity data, wherein the identity data is based on the PEI and comprises an indication that the UE is authorized, not authorized, partially authorized, or unknown; and
evaluating an authenticity of the UE based at least in part on the identity data, wherein the evaluating includes determining if the UE is associated with a fraud list or a blocked list.