Through time domain observation, typical wireless signal strength values seems to exhibit some forms of mean-reverting and discontinuous ''jumps'' behaviour. Motivated by this fact, we propose a wireless link prediction and triggering (LPT) technique using a modified mean-reverting Ornstein-Uhlenbeck (OU) jump diffusion process. The proposed technique which we refer as OU-LPT is an integral component of wireless mesh network monitoring system developed by ICT FP7 CARrier grade wireless MEsh Network project. In particular, we demonstrate how this technique can be applied in the context of wireless mesh networks to support link switching or handover in the event of predicted link degradation or failure. The proposed technique has also been implemented and evaluated in a real-time experimental testbed. The results show that OU-LPT technique can significantly enhance the reliability of wireless links by reducing the rate of false triggers compared to a conventional linear prediction technique and therefore offers a new direction on how wireless link prediction, triggering and switching process can be conducted in the future.
In a composite radio environment, different radio technologies can be co-operating components of a combined heterogeneous infrastructure, managed by an advanced service and network management system. This paper presents an architecture that aims to maximize the derived benefits, by managing efficiently the performance of the underlying networks.
The paper describes a network architecture, studied within the Daidalos EU project, which supports seamless communication mobility across multiple technologies at the IP layer. The architecture implements an approach to heterogeneity management in which supporting functions are distributed among the end-devices and the network infrastructure. It supports both mobile-and network-initiated handovers, managed in a technology-independent way. The architecture incorporates a cross-layer design of supporting functions, resulting in enhanced reliability and good performance. A high degree of security is achieved with a combination of security protocols that govern terminal bootstrapping, user registration in the network and handover process.The solution is generic. It is being tested in different network environments of single-hop radio access networks (802.11, 802.16, TD-CDMA) and broadcast networks (DVB-T). It will also be tested soon in multi-hop ad-hoc (802.11e) and in moving networks (NEMO).
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