Feeds

Boffins ponder wireless 'hetnets' as home backhaul helpers

There goes the neighbourhood

Mobile application security vulnerability report

Heterogeneous networks – hetnets, or WiFi offloading – are all the rage among carriers and equipment vendors, but it generally assumes the WiFi access point has a wired connection.

A group of Greek and UAE researchers has proposed a scheme for using wireless as the backhaul channel. The researchers are particularly looking at how offloading works in home settings, with the growing popularity of femtocells (eNB in the research paper) as ways for providers to stop customers straying off their networks to fixed connections. This is particularly pertinent in places where the fixed infrastructure is running behind mobile network deployment.

The problem is that with three different wireless networks in use (counting the home WiFi), there's a lot of potential for interference. As the Arxiv-hosted paper puts it:

“A UE [user equipment – El Reg] that is directly connected to the eNB, will experience interference caused by adjacent eNBs, which serve other UEs and APs at the same cellular frequencies. On the other hand, considering the eNB→AP→UE scenario, in the first phase, the AP will experience interference from adjacent eNBs which serve other UEs and the APs at the same cellular frequencies, while in the second phase the UE experiences the interference from other APs that serve UEs at the same WLAN frequencies.”

So the researchers want to minimise that interference, without demanding any changes to the cellular network.

Their paper suggests that channel selection, and therefore the interference problem, can be handled at the user-side alone.

The user station uses SINR – the signal to interference-plus-noise ratio – to make two selection choices:

  • Do I connect to the cellular network, the signal from the femtocell, or a WiFi network?
  • How do I select a non-interfering channel?
Home hetnet channel selection diagram

Choose the right channel to make the hetnet work. Image: http://arxiv.org/pdf/1311.2970v2.pdf

As well as helping performance where the user device has to choose between as many as three signals, the extremely maths-heavy paper suggests the scheme could also help relieve traffic from the cellular network. ®

Bridging the IT gap between rising business demands and ageing tools

More from The Register

next story
Manic malware Mayhem spreads through Linux, FreeBSD web servers
And how Google could cripple infection rate in a second
EU's top data cops to meet Google, Microsoft et al over 'right to be forgotten'
Plan to hammer out 'coherent' guidelines. Good luck chaps!
US judge: YES, cops or feds so can slurp an ENTIRE Gmail account
Crooks don't have folders labelled 'drug records', opines NY beak
FLAPE – the next BIG THING in storage
Find cold data with flash, transmit it from tape
Seagate chances ARM with NAS boxes for the SOHO crowd
There's an Atom-powered offering, too
Gartner: To the right, to the right – biz sync firms who've won in a box to the right...
Magic quadrant: Top marks for, er, completeness of vision, EMC
prev story

Whitepapers

Reducing security risks from open source software
Follow a few strategies and your organization can gain the full benefits of open source and the cloud without compromising the security of your applications.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
Application security programs and practises
Follow a few strategies and your organization can gain the full benefits of open source and the cloud without compromising the security of your applications.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.
Consolidation: the foundation for IT and business transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.