UK telecoms and broadcasting regulator Ofcom has set out proposals aimed at preventing interference to DTT signals from soon to be rolled out 4G mobile services.

Likely be introduced in the UK by 2012, the 4G services will use the 800 MHz frequency band which sits adjacent to the frequencies used for digital terrestrial television (DTT) broadcasting in the UK.

Such proximity could cause the signals from mobile base stations to interfere with set top boxes and digital TVs. Ofcom calculates that the problem could potentially affect up to 3% of DTT viewers if no measures were put in place to solve the problem.

In a consultation document, Ofcom has proposed a number of ways to reduce this interference, such as in some cases viewers having to fit a filter to their TV aerial.

Yet Ofcom concedes that for less than 0.1% of DTT viewers, filters may not solve the problem.

The regulator stresses that it is considering a number of options to address the problem which may require some viewers to change platforms. It says that it is carrying out more research into this issue and expects to publish a further consultation in the autumn.