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Seamless redundancy

Seamless redundancy is a set of techniques in which the same data packet is transmitted on different channels. With seamless redundancy, the likelihood that the packet arrives to the destination increases, and at the same time communication latencies decrease. Both reliability and latency are indispensable characteristics of today's industrial, and other types of networks.

In the context of my research, seamless redundancy techniques were applied to IEEE 802.11 (Wi-Fi) in order to implement frequency diversity.

We firstly introduced seamless redundancy in papers [J10] and [P22].

Seamless redundancy was then theoretically analyzed in [J12], with the hypothesis that the physical channels used by the transmitters have an uncorrelated behavior. This hypothesis holds in practice only if the Wi-Fi network and adapters are configured following the guidelines reported in [J13].

One of the main problems of seamless redundancy is bandwidth consumption, because the same data packet is transmitted in more than one channel (i.e., in the case of double redundancy, bandwidth consumption is twice). Techniques aimed at reducing bandwidth consumption, in which packets are not always transmitted in all the channels, were initially analyzed in [J14].

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