Village Telco and OpenBTS Networks: Technology Overview and Challenges

Published on: Oct 25 2010 by Steve Song
Share

Village Telco and OpenBTS are different technologies but they have a lot in common. One big thing they have in common is the belief that telephone networks don’t need to be run by top-down command and control organisations, that anyone with some expertise and comparatively modest resources should be able to start their own phone company.

I’ll give a brief summary of both and then explain the challenges that each face.

OpenBTS Overview

OpenBTS is an open source GSM base station. It is inexpensive. It costs 5-10% of what a commercial base station costs to deploy. It operates on less that 60W of power which means it’s OPEX is dramatically lower than a typical base station which can consume anywhere between 2000 – 8000W depending on its age. It has an equivalent range to commercial BTSes (~20km in 900MHz band).

It has an all IP back-end which makes every mobile phone look like a SIP phone. If ever there was a technology that said “instant phone company” this is it. The Daily Wireless posted a great summary of OpenBTS if you need more detail.

OpenBTS Challenges

The big challenge for OpenBTS is access to spectrum. In Africa, most of the available mobile spectrum in the 900MHz and 1800MHz bands have been locked up by mobile operators. They will fight tooth and nail at every turn to block something like OpenBTS disrupting their model. I think the hope for OpenBTS on this continent is to have one of the smaller hungrier mobile operators take up this technology and really focus on rural markets. That said, after Bharti-Airtel’s very aggressive moves on pricing in Kenya, perhaps they might interested in something like OpenBTS to further shake up the market. As it happens there is an operator in India called VNL which is using a similar strategy.

From a technological perspective, two limitations to OpenBTS is that it does not yet support GPRS but I gather that will shortly be available, and it does not support handoffs between cells. In terms of deployments, OpenBTS is being deployed for its 4th year at Burning Man but more importantly they have done a deployment on the island of Niue which is more of a real world demonstration of the technology. They may have others that I am not aware of.

Village Telco Overview

The Village Telco by comparison uses low-cost WiFi devices to create a wireless mesh, a cloud of connectivity where each device extends the range of the network. This sort of network has bee commercially deployed by companies like OpenMesh and Meraki in the US. What is unique about Village Telco is the development of a meshed WiFi access point mashed up with an Analogue Telephony Adaptor which is a device that translates the analogue voice signal of an ordinary telephone into digital communication that can be understood by the wireless access point.

This device, which we call the Mesh Potato, then allows you to plug an ordinary phone into it and start making calls. Each device has a range of about 400m on a flat plain or about half that in an urban environment. More on the Village Telco rural voice services business model.

Both OpenBTS and the Village Telco can operate autonomously or even better they can been connected to the VoIP services on the Internet or interconnected with the PSTN and mobile operators.

Village Telco Challenges

With the Village Telco, we deliberately chose unlicensed “WiFi” spectrum in order to drive around the whole spectrum regulatory issue. Although historically this has not been the case in Africa, increasingly Wifi is recognised as unlicensed spectrum by the majority of African countries. This means that you can set up a network without seeking permission from the regulator. Generally, it is only when you start charging money for the telecommunication services that you need to have a telecommunication operators license. In places like Kenya and South Africa you can seek exemption from that as a non-profit. Alternatively, you could affiliate a Village Telco network with an existing VoIP service provider and fly under their wing.

For the Village Telco, WiFi has limitations in that its range is shorter and transmission power is lower. That’s the trade-off for being unlicensed. WiFi spectrum doesn’t travel through concrete very well, thus WiFi connections ideally have line-of-sight or at least very modest obstacles. That’s why we designed the Mesh Potato with a rugged outdoor enclosure so the user can stick the device higher up outside the house if necessary.

For the Village Telco, the deployments to date are quite small because we have been working with a small run of about 200 beta Mesh Potatoes. There is a Village Telco network in Dili, East Timor which is being developed by a local NGO there. And we have small network in Cape Town. Both should grow quickly as soon as the commercial Mesh Potatoes are available. As it happens, they recentlty went on sale if you want one.

This post started as the OpenBTS and Village Telco – low-cost GSM networks email thread


.

Get ICTworks 3x a week – enter your email address:

For the last 2 years, I’ve been lucky enough to have a fellowship with the Shuttleworth Foundation to work on telecommunications and access issues in South Africa. Prior to joining the Foundation, I spent 10 years at the International Development Research Centre in Ottawa funding and engaging in research into Information and Communication Technology for Development (ICT4D) issues, mostly in Africa.
Stay current with ICTworks - enter your email address:

5 Comments to “Village Telco and OpenBTS Networks: Technology Overview and Challenges”

  1. Steve Song says:

    The OpenBTS folk gave me an update on what’s going on. They are going from strength to strength. Here’s a summary:

    * cell-to-cell handoff and roaming support is coming soon, March 2011, or sooner, depending how beta testing goes.  
    * GPRS support should be available around June 2011 and UMTS around September 2011.

    Range Networks who develop and deploy OpenBTS have over 200 systems installed now on every continent including Antarctica and over 7,000 copies of their software stack have been distributed.

    Pretty amazing!

  2. Wayan Vota says:

    We’d love to hear of your Village Telco successes as well, Steve. What’s the progress with growing Mesh Potatoes around the world?

  3. Steve Song says:

    Hi Wayan. Thanks for the prod. :-) Now that we have production Mesh Potatoes, we are just beginning to scale our pilot networks. The biggest network so far is in Dili, East Timor with nearly 100 nodes. Here in South Africa, the Bo-kaap network in Cape Town has about 25 active nodes. We should double that in the next couple of weeks. We’ve sold close to 400 Mesh Potatoes in the 1st month so stand by for more and bigger networks. :-)

  4. corradi sebastien says:

    I discover the project and see it as a tremendous opportunity for african countries and every uncovered places to join IP and phone.
    I’m radio GSM indoor out outdoor coverage and can help you for engeneering support.
    we’ve a good rf lab and can modifiy, tune and built rf system.
    sebastien

  5. Daniel Maina says:

    Meshed potato is a good technology, l was so excited ever since I come acrosss it…truly we donno what the future holds for us

Sorry, the comment form is closed at this time.