US 11,799,916 B2
Handling radio link failure in a narrow bandwidth internet of things control plane
Vesa Lehtovirta, Espoo (FI); Christine Jost, Lund (SE); and Monica Wifvesson, Lund (SE)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Appl. No. 16/347,660
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Nov. 2, 2017, PCT No. PCT/EP2017/078012
§ 371(c)(1), (2) Date May 6, 2019,
PCT Pub. No. WO2018/083151, PCT Pub. Date May 11, 2018.
Claims priority of provisional application 62/418,487, filed on Nov. 7, 2016.
Prior Publication US 2019/0320318 A1, Oct. 17, 2019
Int. Cl. H04L 9/00 (2022.01); H04L 9/40 (2022.01); H04W 12/041 (2021.01); H04W 12/106 (2021.01); H04W 12/108 (2021.01)
CPC H04L 63/205 (2013.01) [H04W 12/041 (2021.01); H04W 12/106 (2021.01); H04W 12/108 (2021.01)] 18 Claims
OG exemplary drawing
 
1. A method of operating a user equipment (“UE”) comprising:
establishing a radio resource control (“RRC”) connection with a source base station;
subsequent to establishing the RRC connection, sending an indication of a security capability of the UE to the source base station;
subsequent to sending the indication, receiving a non-access stratum (“NAS”) message from the source base station, the NAS message includes an identifier of a selected security algorithm;
responsive to receiving the NAS message, generating an access stratum security key based on the identifier of the selected security algorithm;
generating an RRC integrity token using the selected security algorithm and the access stratum key;
in response to a link failure between the UE and the source base station, transmitting the RRC integrity token to a target base station, wherein the source base station then receives the RRC integrity token from the target base station and verifies the RRC integrity token.