Method and arrangement in a telecommunication system

Details Method and arrangement in a telecommunication system Method and arrangement in a telecommunication system

H - Electricity

04

L

H04L 9/08 (2006.01) H04L 9/32 (2006.01) H04L 29/06 (2006.01)

Patent

CA 2699846

A security key, K_eNB, for protecting RRC/UP traffic between a User Equipment, UE, (11) and a serving eNodeB (12) is established by a method and an arrangement in a Mobility Management Entity (13), MME, and in said UE (11), of an Evolved Packet System, EPS. The MME and the UE derives the security key, K_eNB, from at least an NAS uplink sequence number, NAS_U_SEQ, sent from the UE to the MME, and from an Access Security Management Entity-key, K_ASME, shared between the MME and the UE.

Selon l'invention, une clé de sécurité, K_eNB, pour protéger un trafic RRC/UP entre un équipement utilisateur, UE, (11) et un nud B évolué de desserte (12) est établie par un procédé et un arrangement dans une entité de gestion de mobilité (13), MME, et dans ledit UE (11), d'un système par paquet évolué, EPS. La MME et le UE déduisent la clé de sécurité, K_eNB, à partir d'au moins un numéro de séquence de liaison montante NAS, NAS_U_SEQ, envoyé de l'UE à la MME, et à partir d'une clé d'entité de gestion de sécurité d'accès, K_ASME, partagée entre la MME et l'UE.

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