Comms regulator Ofcom is considering the use of mesh radio technology as a means of improving the efficiency of radio spectrum usage.

A consortium has completed a research study on behalf of Ofcom to investigate the technical reality of mobile mesh networks as part of a wider spectrum efficiency scheme.

A mobile mesh network consists of a number of devices each receiving and transmitting its own traffic, while acting as a router and relay for other devices. A feature of such as mesh network is that it is able to adjust if a node becomes overloaded or unavailable.

According to Plextek, which led the research, mobile mesh networks should be an integral part of Ofcom’s plans for use of the spectrum for 4G wireless communications.

The study was focussed on mobile mesh networks at relatively low frequencies (below 3.5GHz) and suitability of present transport methods to mesh systems.  

The study found mobile mesh networks to be a good approach for extending network coverage when deployed with existing infrastructure, for WiFi hotspots or cellular multi-hopping, and for coverage extension in a city or urban areas, for example to transmit a signal around obstacles.

“Using a mesh network to extend coverage costs less than building new infrastructure and reduces the need for large cell sites and consequentially EM radiation,” said Plextek.

But the study also found that large mobile mesh networks will not be practical for real-time voice or video without additional infrastructure, due to the variable delays which can occur as a result of the way in which a mesh network operates.

Ofcom has also commissioned Plextek to look into the practicalities of using wireless technology as an alternative for the provision of the last mile communications to the home. Plextek will be analysing the feasibility of mesh networks, amongst others, for this type of application. The report is expected to be published at the end of this year.