WTIC assesses interference risks of 2.3GHz 4G LTE to WiFi and Bluetooth

WiFi and Bluetooth devices at 2.4GHz could be affected by new 4G LTE traffic in the 2.3GHz band after it’s auctioned later this year.

That’s the conclusion of research by the Wireless Test and Innovation Centre (WTIC) hosted by DTG Testing, to assess the impact of mobile broadband services on existing users.

The WTIC’s report recommends that WiFi receivers will need 2.3GHz LTE filtering or smart signal avoidance to ensure the best possible network performance.

Bluetooth and assistive listening device manufacturers specifically will need further research to fully assess and mitigate the risk of interference at very short distances.

Alex Buchan, Principal RF Engineer at DTG Testing, said: “This research will enable Ofcom to plan the release of new spectrum with the least possible interference to existing users, and to conduct further research where the WTIC has indicated a requirement.

“It further demonstrates the ability of DTG Testing to host a virtual test centre using facilities and expertise already established through more than a decade of RF testing and research work on behalf of the industry.”

In addition to identifying potential areas of interference to existing 2.4GHz spectrum users, the project also defined and implemented a TDD-LTE recording and playback methodology which should be adopted to reduce the time and cost of all future co-existence and interference testing. This complements the FDD-LTE test methodology derived from previous work.

The UK government is due to auction 40MHz of spectrum in the 2.3GHz band for use by proposed TDD-LTE services, which is separated by 10MHz from the 2.4GHz band used for WiFi, Bluetooth and other unlicensed wireless technology.

Reports and information on the WTIC can be found at wtic.org.uk.

DTG Staff  |  17.09.2015

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