Patent ID: 9179318
Filing Date: 2015-11-03
Classification: H04L,H04W

Abstract:
1. A method of handling mobility-related signaling in a communications system comprising a mobile node, a mobile router, and a peer node, the method comprising: providing the mobile router with a delegation certificate that is cryptographically signed by or on behalf of the mobile node; maintaining a first counter at the mobile router and incrementing the first counter for each mobility-related signaling exchange conducted by the mobile router with the peer node on behalf of the mobile node; at the mobile router for each mobility-related signaling exchange initiated with the peer node on behalf of the mobile node, providing to the peer node within this exchange, said delegation certificate or an identification of the certificate and a sequence number associated with the certificate as defined by the current value of said first counter; at the peer node, maintaining a second counter synchronized with said first counter maintained at the mobile router and, for each mobility-related signaling exchange conducted with the mobile router, comparing the received sequence number with a sequence number as defined by the current value of the second counter maintained by the peer node in respect of the delegation certificate, and authorizing the mobility-related signaling exchange in dependence upon the result of the comparison; and wherein the mobile router maintains the first counter which is dedicated to keeping track of a number of mobility-related signaling exchanges conducted by the mobile router with the peer node on behalf of the mobile node; and wherein the peer node maintains the second counter which is dedicated to keeping track of a number of mobility-related signaling exchanges conducted by the mobile router with the peer node on behalf of the mobile node.