Setting out its plans for the 2016/17 operational year, including activities relating to the expansion of DAB digital radio, the regulator revealed that it had been approached by the Welsh Government over concerns that the signals carrying the BBC's two radio stations for Wales don't cover all areas sufficiently.
Acknowledging that the availability of BBC Radio Cymru and BBC Radio Wales is primarily a matter for the BBC, it noted that while FM coverage of BBC Radio Cymru was high, BBC Radio Wales could only reach 81% of households on FM.
With the BBC currently exploring options for improving BBC Radio Wales FM coverage, Ofcom confirmed that it saw no reasons why the existing BBC National DAB multiplex, which carries all of the BBC's UK-wide stations, can't be re-configured to add BBC Radio Cymru and BBC Radio Wales via 14 unnamed transmitter sites in mid-Wales.
BBC National DAB reaches 97% of the UK. Adding BBC Radio Cymru and Wales would affect the amount of space available for other BBC stations in mid-Wales.
Meanwhile, in South, south-west Wales and North Wales, various local DAB multiplexes are currently being expanded to reach more people. These multiplexes already carry BBC Radio Cymru and BBC Radio Wales, which would complement any re-configuration in mid-Wales and any gaps in FM coverage.
Due to the way the BBC National DAB multiplex is broadcast as a single frequency network across the country, a solution that is being portrayed by Ofcom for mountainous mid-Wales is unlikely to be viable in other parts of the UK. BBC Local Radio in England and BBC radio stations for Scotland and Northern Ireland are carried on a network of local DAB multiplexes, operated by commercial organisations.
Ofcom does not plan to force any changes; it says that it is "a matter for the BBC to decide" on whether they will move forward with these proposals. The Welsh Government has said that it "looks forward to receiving further information on the options on the table in due course and to a suitable solution being put in place during the forthcoming year."