US 11,856,035 B2
Network nodes and methods performed therein for handling discovery of entrance points to an IP multimedia subsystem
Liangliang Guo, Shanghai (CN); and George Foti, Dollard-des-Ormeaux (CA)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Appl. No. 17/597,194
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Jul. 1, 2019, PCT No. PCT/CN2019/094249
§ 371(c)(1), (2) Date Dec. 29, 2021,
PCT Pub. No. WO2021/000229, PCT Pub. Date Jan. 7, 2021.
Prior Publication US 2022/0247798 A1, Aug. 4, 2022
Int. Cl. H04L 65/1069 (2022.01); H04L 65/1016 (2022.01); H04L 65/1045 (2022.01); H04L 65/1073 (2022.01)
CPC H04L 65/1069 (2013.01) [H04L 65/1016 (2013.01); H04L 65/1045 (2022.05); H04L 65/1073 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method performed by a network node in a communications network, for handling of discovery of entrance points of a User Equipment (UE) to an IP Multimedia Subsystem (IMS) network, during an IMS Protocol Data Unit (PDU) session setup, wherein the method comprises:
obtaining a list of IMS entrance point instances in which each IMS entrance point instance is a Proxy Call Serving Call Control Function (P-CSCF) instance, wherein the list of IMS entrance point instances comprises an address of each IMS entrance point instance and one or more transport protocols supported by each IMS entrance point instance, and wherein the list of IMS entrance point instances is obtained by retrieving the list from a Network Repository Function (NRF);
generating, based on the obtained list of IMS entrance point instances, a configuration message for IMS entrance point discovery, comprising addresses of the IMS entrance point instances of the list and the one or more transport protocols supported by each IMS entrance point instance; and
providing, to the UE, the generated configuration message comprising the addresses of the IMS entrance point instances of the list and the one or more transport protocols supported by each IMS entrance point instance.