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2013-10-15 09:26:46
By Frank Swain
Our hunger for wireless data is threatening to crash our communication networks
- but there are ways to avoid disaster.
If you think city streets are congested and badly planned, consider the air
surrounding them. It is infused with data, pouring forth from phone masts,
radio towers, wi-fi routers, bluetooth, taxi radios, airport beacons, even
remote control garage doors. Our lives have become so saturated with data the
fear is that communication networks could grind to a standstill entirely - it s
known as the spectrum crunch. Yet could we find ways to avoid this looming
data-geddon?
The problem is that so many wireless devices nowadays use the radio spectrum to
transmit and receive data. When this spectrum was first divided up between
different users, the authorities treated it like empty land. Swathes were
allocated for different uses, including radio, television, navigation,
astronomy, maritime services, aeronautics, military and of course,
telecommunications. However, some of these industries grew much faster than
others. For instance, while much of the military spectrum remains unused, the
part reserved for telecommunications is bursting at the seams. For instance,
while much of the military spectrum remains unused, the part reserved for
telecommunications is bursting at the seams.
The situation for telecoms became so dire that in 2012, London faced the very
real threat that its wireless communications network would fail under heavy
load. During the 2012 Olympic Games, British communications regulator Ofcom had
to borrow part of the military spectrum to ensure the audio, visual and sensor
feeds didn t grind to a halt as the athletes were sprinting across the finish
line.
Our demand for data is poised to rise in the coming years, so Ofcom and many
other communications regulators worldwide are concerned. There's a significant
risk of a spectrum crunch by 2020, says Simon Saunders, director of technology
at Real Wireless, an independent consultancy based in Pulborough, UK. If the
problem is not addressed, in local areas with intense demand there is a risk
everything will slow down.
Many governments, then, are looking for ways to alleviate the problem before
the wireless signal to our electronic devices starts failing. So far, the
principle strategy has been to find more spectrum. That s not easy. As a finite
resource, we can no more create extra spectrum than we can create extra land.
Instead, spectrum allocated to one party can be reassigned to another, but this
process involves evicting the current tenant, and that isn t something to be
taken lightly. Many countries were given much-needed breathing room by the
switchover to digital television, which freed up the 800MHz band previously
allocated to analogue TV. But this shift required all televisions to be
augmented or replaced.
The body responsible for regulating the radio spectrum, the International
Telecommunication Union, will meet in 2015 to discuss the problem at the World
Radio Conference in Geneva in 2015. There, it s likely that the assembled
parties will flag additional parts of the spectrum they want to see freed up
for telecommunications. Some countries are already forging ahead. In the UK,
for instance, Ofcom is eyeing up some of the under-used military spectrum to
sell off, with the proceeds going to the Ministry of Defence. And in 2012, the
US Federal Communications Commission approved a plan to encourage broadcasters
to sell under-used parts of their allocated spectrum to other users. The first
of those auctions is to be held in January next year, when the 10MHz H band
is expected to go for at least $1.56bn.
However, there are only so many land grabs and sales available. Additional
spectrum may double capacity in the next ten years, warns Saunders, but it
will not be enough to feed demand.
In a report published this month, Ofcom warned that data demand in the UK could
increase 80-fold over the next two decades, driven primarily by the increase in
mobile broadband.
What other options are on the table? Already, mobile service providers practice
intensive and complex traffic management to ensure you get a steady signal.
This includes throttling data allowances in real time, but this strategy only
works when low impact use such as voice calls can be prioritised over
high-resource uses such as streaming video. Throttling preserves a strong
connection to a cell tower and avoids dropped calls or blackspots, but at the
cost of reducing bandwidth available to each person. This might not be an
acceptable compromise if you expect and pay for a reliable, high speed data
connection.
Arguably the most important strategy in avoiding a spectrum crunch is resource
sharing. Spectrum-sensing devices that can automatically detect congestion and
switch to a less polluted radio band hold a lot of promise, but this technology
is still some way in the future.
A temporary fix to reduce local congestion is to increase the number of mobile
towers and thus reduce the size of cells. This allows operators to serve more
users without needing any additional spectrum space, much the same way as
opening more checkouts in a busy supermarket. But more towers means more
infrastructure to build and maintain, and less revenue per tower. And as more
and more data-hungry devices are added to the grid, the number of towers needed
grows. It will become harder and harder to build more cells to accommodate
traffic, says Saunders.
Another way to shrink the electromagnetic footprint of our digital
communications is to piggyback one service on top of another. From the customer
s point of view, streaming video content to a digital television is no
different than streaming it to a mobile phone, so it makes little sense that
these two services should be forced to operate in different bands. For example,
Microsoft has provided broadband to people in rural areas of Africa by using
the white spaces of the TV spectrum essentially, the unused frequencies.
This type of doubling up also offers the best chance for a cost-effective
development of the much vaunted Internet of Things. So far, no one knows who is
going to pay for the infrastructure to connect billions of devices, each of
which offers the mobile operator a tiny fraction of the revenue that a
smartphone customer would generate. Allowing the Internet of Things to run on
the back of another service, rather than in a dedicated spectrum space of its
own, might be the only way to finance it.
This kind of spectrum sharing comes with its own problems. US company
LightSquared came to blows with the satnav industry over its attempts to roll
out 40,000 transmitters to provide blanket wireless broadband coverage to its
customers. The powerful transmitters threatened to drown out the weak GPS
signals which operated in the adjacent band. Eventually, the FCC ruled that
LightSquared could not operate in that part of the spectrum, and the company
filed for bankruptcy. (It has since relaunched, intending to move to a
different part of the spectrum with more accommodating neighbours).
As our apparently insatiable demand for data continues to grow faster than the
space allocated for it, we should expect to see more friction between these
neighbouring spectrum bands. The more densely you pack users, the more
problems you'll have with noisy neighbours, says Saunders. 4G has barely
started to roll out in the UK, but it s already known that it will inflict some
interference on digital TV. So far the effect seems to be small, but it s
further evidence that the harmony between different spectrum users rests on
strong regulation.
For the spectrum crunch to be avoided, careful management of our
electromagnetic space will be required, just as pressures on land fostered an
intricate web of laws and regulations that continues to shape our cities today.
This is possible, and widespread outages can be avoided, but governments cannot
rest idle. There is enough spectrum for everyone, says Saunders. So long as
it is in the right hands, in the right place, at the right time.