Ofcom released a consultation document today on ultra wideband (UWB) in the UK.
Given Ofcom’s statutory duties under the Communications Act 2003 to ensure the optimal use of the radio spectrum under its management, they should be keen on UWB.
The strength of UWB also causes its problems. By simultaneously transmitting over a wide range of frequencies (around 3.1 – 10.6GHz, if you’re interested), UWB is able to achieve higher data transfer rate than other wireless technologies.
By spreading over these frequencies it has the possibility of interfering with services that currently operate in or around these services, such as 3G, broadband fixed wireless access and radio astronomy.
Back in May 2004, Ofcom commissioned Mason Communications and DotEcon to produce an independent report in to UWB. Delivered in December 2004 (Read the final report, all 218 pages of PDF fun), it looked at the advantages to the UK economy of allowing UWB applications and the disadvantages of increased interference to existing radio spectrum users.
The report focuses on the use of UWB to create a Personal Area Network (PAN) with examples of usage being; providing wireless connections between DVD players, displays and speakers; and using them for high speed wireless links between digital cameras and computers.
While acknowledging interference is likely, it’s clear that Ofcom feels this should be weighed carefully against UWB’s potential benefits. To check this interference, the suggestion is to use a technical ‘mask’, controlling the amount of power that could be used at different frequencies, in an attempt to reduce the impact of interference.
The US regulator has already authorised UWB on a licence-exempt basis, but Ofcom consider the US specification to be inappropriate for the UK. Their proposal is that if UWB is allowed, it should be on a licence-exempt basis, but be limited to the same in-band power levels as permitted in the US, but have tighter out-of-band limits.
Ofcom point out that there is a need to come to a decision soon, fearing US-built UWB devices could be imported in to the UK.
All of these add up to a big pressure on the frequency users that would be affected. It will be interesting to see what their reaction will be during the consultation period which closes 24 March 2005.