Security optimization for ims/mmd architecture

H - Electricity – 04 – W

Patent

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H04W 12/00 (2009.01) H04W 8/02 (2009.01)

Patent

CA 2663046

A mechanism by which handoff delay can be minimized while not compromising the IMS/MMD security and also protecting the media if required by certain applications is presented. Methods for mitigating delay during SA re-association and mitigating the IPSec tunnel overhead for signaling and media at the Mobile Node are given. In one embodiment, SA keys can be transferred from the old P-CSCF to new P-CSCF, enabling the establishment of SAs before Mobile Node physically moves to the new subnet in a network. Proactive handover is used. In another embodiment, SA keys are transferred from S-CSCF to new P-CSCF. In this case, the SA keys are transferred to the new P- CSCF by S-CSCF through a context transfer mechanism well in advance so that SAs may be established before Mobile Node physically moves to new subnet. In another embodiment, methods for mitigating IPSec tunnel overhead are presented.

L'invention concerne un mécanisme au terme duquel on peut minimiser le délai de transfert sans pour autant compromettre la sécurité IMS/MMD et tout en protégeant le support si certaines applications l'exigent. L'invention concerne également des procédés d'atténuation de délai pendant la ré-association SA et d'atténuation des surcharges du tunnel IPSec pour la signalisation et les multimédia au niveau du noeud mobile. Dans un mode de réalisation, les clés SA peuvent être transférées de l'ancien P-CSCF au nouveau P-CSCF, ce qui permet l'établissement de SA avant que le noeud mobile se déplace physiquement vers le nouveau sous-réseau dans un réseau. Un transfert proactif est utilisé. Dans un autre mode de réalisation, Les clés SA sont transférées du S-CSCF au nouveau P-CSCF. En l'occurrence, les clés SA sont transférées bien en avance vers le nouveau P-CSCF par le S-CSCF par le biais d'un mécanisme de transfert contextuel, ce qui permet d'établir des SA avant que le noeud mobile se déplace physiquement vers le nouveau sous-réseau. Dans un autre mode de réalisation encore, l'invention concerne des procédés permettant d'atténuer les surcharges du tunnel IPSec.

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