US 12,262,438 B2
RRC connection establishment, re-establishment, and resumption in a wireless communication system
Oscar Ohlsson, Bromma (SE); Gunnar Mildh, Sollentuna (SE); and Malik Wahaj Arshad, Stockholm (SE)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Filed on Sep. 6, 2023, as Appl. No. 18/461,582.
Application 18/461,582 is a division of application No. 17/056,788, abandoned, previously published as PCT/SE2019/050464, filed on May 21, 2019.
Claims priority of provisional application 62/674,568, filed on May 21, 2018.
Prior Publication US 2023/0413363 A1, Dec. 21, 2023
Int. Cl. H04W 76/19 (2018.01); H04W 12/03 (2021.01); H04W 12/10 (2021.01); H04W 48/20 (2009.01); H04W 76/27 (2018.01); H04W 80/08 (2009.01)
CPC H04W 76/19 (2018.02) [H04W 12/03 (2021.01); H04W 12/10 (2013.01); H04W 48/20 (2013.01); H04W 76/27 (2018.02); H04W 80/08 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method performed by a radio network node, the method comprising:
receiving, from a wireless device, a radio resource control (RRC) connection request that requests re-establishment or resumption of an RRC connection;
responsive to the RRC connection request, attempting to retrieve a context for the wireless device for re-establishing or resuming the RRC connection; and
determining, based on said attempting to retrieve the context for the wireless device, a type of core network to which the wireless device selects to connect;
wherein either:
the method further comprises, before receiving the RRC connection request, releasing or suspending the RRC connection and storing core network type information in the context for the wireless device or in association with the context for the wireless device, wherein the core network type information indicates the type of core network to which the wireless device selected to connect for the RRC connection, wherein said determining comprises determining said type based on the core network type information stored in or in association with the retrieved context; or
the method further comprises, before receiving the RRC connection request, releasing or suspending the RRC connection and storing the context for the wireless device in one of multiple different possible storage locations respectively associated with different possible types of core networks selectable by the wireless device, wherein said attempting comprises attempting to retrieve the context from one or more of the multiple different possible storage locations and wherein said determining comprises determining said type based on from which possible storage location the context is successfully retrieved; or
said attempting comprises attempting to retrieve the context for the wireless device over one or more of multiple different types of interfaces to another radio network node respectively associated with different types of core networks, and said determining comprises determining said type based on over which type of interface the context is successfully retrieved.