US 11,876,839 B2
Methods and apparatus for selecting a serving session control node in an internet protocol multimedia subsystem, IMS, telecommunication network for a user equipment
Emiliano Merino Vazquez, Madrid (ES); Cristina Ruiz Balmaseda, Madrid (ES); and Jesus Angel De Gregorio Rodriguez, Madrid (ES)
Assigned to Telefonaktiebolaget LM Ericsson (Publ), Stockholm (SE)
Appl. No. 17/781,979
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Apr. 1, 2020, PCT No. PCT/EP2020/059245
§ 371(c)(1), (2) Date Jun. 2, 2022,
PCT Pub. No. WO2021/110289, PCT Pub. Date Jun. 10, 2021.
Claims priority of application No. 19383087 (EP), filed on Dec. 5, 2019.
Prior Publication US 2023/0007055 A1, Jan. 5, 2023
Int. Cl. H04L 65/1016 (2022.01); H04L 65/1073 (2022.01); H04L 65/1046 (2022.01); H04L 65/1059 (2022.01)
CPC H04L 65/1046 (2013.01) [H04L 65/1016 (2013.01); H04L 65/1059 (2013.01); H04L 65/1073 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method of selecting a serving session control node in an Internet Protocol, IP, Multimedia Subsystem, IMS, telecommunication network, for a User Equipment, UE, the method comprising:
receiving, by an interrogating session control node, a Session Initiation Protocol, SIP register message for registering the UE in the IMS telecommunication network, the SIP register message comprising a UE capability feature mappable, by a Home Subscriber Server, HSS, to a UE initiated server capability supported by the serving session control node;
transmitting, by the interrogating session control node, to the HSS, a user authorization request message comprising the UE capability feature;
in response to the user authorization request message, receiving, by the interrogating session control node, from the HSS, a user authorization answer message comprising one or more UE initiated server capabilities supported by the serving session control node; and
selecting, by the interrogating session control node, the serving session control node based on the one or more received UE initiated server capabilities in the user authorization answer message.