Methods and systems for hfn handling at inter-base station...

Details Methods and systems for hfn handling at inter-base station... Methods and systems for hfn handling at inter-base station...

H - Electricity

04

W

H04W 36/02 (2009.01)

Patent

CA 2702259

Systems and methods for addressing the de-synchronization of the cryptsync between the network and the mobile stations (eNB) that can occur at mobility are addressed. De-synchronization is resolved by forwarding HFN and PDCP Sequence Number(s) from the source eNB to the target eNB. In order to avoid re-use of a crytosync for a given key, a backward offset from the initial COUNT value is used by the target eNB. These approaches do not require an over-the-air signaling and the COUNT value handling in the network is transparent to the mobile station.

L'invention concerne des systèmes et des procédés pour adresser la désynchronisation du cryptsync entre le réseau et les stations mobiles (eNB) qui peut se produire lors de la mobilité. La désynchronisation est résolue en acheminant un ou des numéros de séquence HFN et PDCP de la source eNB à la cible eNB. Afin d'éviter une réutilisation d'un crytosync pour une clé donnée, un décalage vers l'arrière de la valeur de DECOMPTE initiale est utilisé par l'eNB cible. Ces approches ne requièrent pas une signalisation radio et la manipulation de valeur de DECOMPTE dans réseau est transparente pour la station mobile.

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