Concepts and algorithms studies the respective concepts and algorithms in detail. WP3 includes the dedicated tasks for the new functionalities required for the IoT. The use of light as a new wireless medium has the advantage that a guaranteed VLC bandwidth can be provided, not limited by interference from transmissions in other rooms. However, large rooms are normally covered by multiple luminaires which is also desired from a link reliability point of view. Accordingly, one major area in ELIOT is to combine several isolated VLC cells deployed in the same room into a networked solution. This approach has multiple advantages i) to enable positioning, ii) to allow mobility between the VLC cells and iii) to move between luminaires using MIMO multicast allow handover mitigate interference between adjacent luminaires. Moreover, an important issue is the ability of interworking between radio and VLC links ultimately targeting parallel operation in the same chipset at the device side. WP3 will further develop the open ELIoT architecture as a main outcome of the project, aligned to the outcome of WP2 on use cases and requirements. Leveraging the results of WP3 and WP4 on concepts, algorithms, and the design and implementation of advanced functions like positioning and multicasting, WP7 will develop a common open reference architecture in order to support the implementation of a reference model software. The open reference architecture and software will also play an important role in further dissemination activities, as it will visualize through a common representation the wide applicability of VLC across many network infrastructures and markets. Through the common representation of key players in the lighting and telecommunication sector, the open reference architecture is expected to play a crucial role in further product development.