Future generation cellular networks are expected to provide ubiquitous broadband access to a continuously growing number of mobile users. In this context, LTE systems represent an important milestone towards the so called 4G cellular networks. A key feature of LTE is the adoption of advanced Radio Resource Management procedures in order to increase the system performance up to the Shannon limit.Packet scheduling mechanisms, in particular, play a fundamental role, because they are responsible for choosing, with fine time and frequency resolutions, how to distribute radio resources among different stations, taking into account channel condition and QoS requirements. This goal should be accomplished

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Computational complexity of Public Key Cryptography over sensor nodes is not anymore a blocking concern in modern devices which natively (and efficiently) support Elliptic Curve Cryptography. The problem has rather shifted towards the significant airtime consumption required to exchange multiple messages and certificates so as to perform authentication and key agreement. This letter addresses such problem by exploiting implicit certificates (Elliptic Curve Qu-Vanstone). We specifically propose a novel Key Management Protocol which suitably integrates implicit certificates with a standard Elliptic Curve Diffie-Hellman exchange, and performs authentication and key derivation. As confirmed by a proof-of-concept implementation and relevant experimental results, the proposed Key Management Protocol guarantees maximal airtime savings (up to 86,7%) with respect to conventional approaches, robust key negotiation, fast re-keying, and efficient protection against replay attacks.

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