Feeds

WTF is... White Space radio networking?

Channel surfing

Top 5 reasons to deploy VMware with Tegile

Is it safe to play here?

The problem is that the device running at point X has to know the frequencies that transmitter A is using, and while various detect-and-avoid technologies have been tried only an online look-up table of locations listed against available frequencies has been shown to actually work.

So a White Space device, regardless of the protocol it will eventually use, has to first query a database to establish which frequencies are available at its current location. If a star topology is being used - such as a single Access Point providing internet connectivity to nearby clients - then only the centre of the star needs to check with the database, the clients can take guidance from the hub.

White Space geo-database model

To use White Space frequencies, you router and devices may have to check there's available capacity from multiple databases
Source: Ofcom

Until the first of these databases was established, in December 2011, broadcast TV had exclusive usage of every White Space frequency. The US broadcast trade body, the NAB, recruited the pneumatic Dolly Parton and an evil, animated telephone to its campaign against the exploitation of White Space, claiming that White Space usage would inevitably interfere with broadcast pictures, despite the US Federal Communications Commission's insistence that there was room for everyone to play.

The angry phone

An angry, White Space-phobic phone, yesterday

In the UK, the Church of England and Andrew Lloyd Webber were roped in to support a similar campaign, centred not on the claim that White Space would knock out broadcast TV but that the White Spaces had hitherto been the exclusive preserve of wireless microphone users.

Professional wireless mics, used in everything from West End shows to Celebrity Big Brother, already use a similar database system to allocate frequencies by region, but the limited quantity of microphones in use has never required real-time dynamic allocations. Touring shows generally know were they're going to be well ahead of time.

Lily Allen and Sennheiser radio mic

A popular radio mic user is undaunted by White Space networking
Source: Sennheiser/John Marshall

The Joint Frequency Managers Group (JFMG), an organisation set up specifically to manage those bands for wireless microphone users, has run the monopoly database for years but has done so with the willing co-operation of the whole entertainment industry.

In the US, the White Space rules conceded a couple of channels for exclusive use by wireless microphones. Something similar will probably happen over here. The entertainment business may feel a bit squeezed, but the rest of us get masses more bandwidth to play with.

Choosing a cloud hosting partner with confidence

Next page: Radio Waives

More from The Register

next story
FCC, Google cast eye over millimetre wireless
The smaller the wave, the bigger 5G's chances of success
It's even GRIMMER up North after MEGA SKY BROADBAND OUTAGE
By 'eck! Eccles cake production thrown into jeopardy
Mobile coverage on trains really is pants
You thought it was just *insert your provider here*, but now we have numbers
Don't mess with Texas ('cos it's getting Google Fiber and you're not)
A bit late, but company says 1Gbps Austin network almost ready to compete with AT&T
prev story

Whitepapers

Forging a new future with identity relationship management
Learn about ForgeRock's next generation IRM platform and how it is designed to empower CEOS's and enterprises to engage with consumers.
Why and how to choose the right cloud vendor
The benefits of cloud-based storage in your processes. Eliminate onsite, disk-based backup and archiving in favor of cloud-based data protection.
Three 1TB solid state scorchers up for grabs
Big SSDs can be expensive but think big and think free because you could be the lucky winner of one of three 1TB Samsung SSD 840 EVO drives that we’re giving away worth over £300 apiece.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.