Patent ID: 8798632
Filing Date: 2014-08-05
Classification: H04L,H04W

Abstract:
1. A non-transitory computer-readable storage medium with instructions that, when executed by at least one processor, provides operations comprising: receiving, at a network element, an indication of a handover of a remote device from a source system to a target system, wherein the target system implements a communications standard different from the source system; determining, at the network element, a sequence value of a security context maintained in the source system; deriving, at the network element, another security context for the target system based at least in part on the determined sequence value; and providing, by the network element, the other security context to the target system, wherein the source system implements an evolved universal terrestrial radio access network communications standard, wherein the determining comprises determining a non-access stratum downlink count, and wherein the deriving comprises calculating a cipher key and an integrity key based at least in part upon the determined non-access stratum downlink count.