Modelling and analysing congestion in KNXnet/IP

The KNX standard for home and building automation has been recently updated by the definition of KNXnet/IP system. It allows integration of different KNX networks through IP using the KNXnet/IP Router. Due to the limited transmission speeds of the KNX, the KNXnet/IP Router may represent a bottleneck. The aim of the paper is to analyse the effect of congestion of KNXnet/IP Router on the information flow exchanged between different KNX networks; furthermore, the analysis will focus on the impact of the two policies available inside the KNXnet/IP Router to forward telegrams coming from IP towards the relevant KNX network.

► Effects of KNXnet/IP Router congestion on information flow between KNX devices.
► Modelling and simulation of KNXnet/IP communication system.
► KNXnet/IP Router may represent a bottleneck in congestion conditions.
► Need for the definition of efficient congestion control rules has been highlighted.
► Strong impact of the KNXnet/IP Router forwarding policies on the congestion.