Can You Run an Open GSM Network?
OpenCell asks: "Here in Vancouver, cellphone companies are charging ridiculous amounts for basic cellphone plans. I'm wondering if it's possible to run an open/almost free GSM network on a small college campus. Assuming we could find the hardware and get the rights, is there open source software out there to handle most aspects for something like this?"
To run the GSM network, you need frequencies in the right range, you'd have to get phones tuned to that frequency and a license from the FCC (Vancouver, WA) or the Canadian equivalent (Vancouver, BC).
You might be able to use 900Mhz or 2.4.Ghz, but you still need specially made phones and cells, and coverage would be poor.
I don't think amateur cell phones are possible.
WiFi phones may be possible, but coverage would be bad.
Which would you prefer, invisible tubes or transparent pipes?
09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C1 bottles of beer on the wall. Take one down, pass it round... Oh, umm...
Aside from the red tape, and all such crap there are a few solutions that will allow you to have a MSC+HLR+BSC+BTS but will not scale well, and since , OpenSS7 is barely usable, if at all, there is no way to scale.
oh, and forget about roaming to your local provider when not in coverage if you do not sign a roaming agreement (highly unlikely).
Grab a phone from nokia or others that dose the wi-fi to gsm trick, use voice over IP to lower costs, deploy a comprehensive wi-fi network in your campus, and you will be better served...
Oh, and by the way, six years of experience in the second (734-02) GSM operator in Venezuela (in the telecomms area, just in case someone was wandering)
http://www.digitel.com.ve/
*** Suerte a todos y Feliz dia!
The idea of an open gsm network would make for an interesting real world pilot project. Unfortunately, just about every nation considers the radio bands you'd normally want to work in to be big buck$. The parent Canadian poster can do a quick Google search regarding frequency assignments in her/his nation, and it's the same situation just about everywhere. You'd be charged a huge sum to license the bands, and/or an additional sum to be licensed as one of a limited number of com providers on those bands.
Theoretically, you could try this on - say - the ISM bands, but they aren't going to give you the same performance as the cell bands. In addition, purpose-built cell equipment isn't designed nor licensed to operate outside of the cell bands, so you'd have a lot of DIY on the hardware side. Not so bad on the provider side so much as on the user side... where're you gonna get the handsets? Yes, there are ISM YoIP handsets, but they aren't really set up for portable use. While ISM ain't what you asked for, it's really all you have available.
Luke, help me take this mask off
The GSM spec allows for a type of cell called a pico-cell. Pico-cells are very low power and allow your cell phone to act like a cordless phone, and route calls throught your landline. Never seen one in north america, but I think Nokia offers it in Europe. Problem is different frequencies and I think it needs an ISDN connection.
Asterix PBX (google is your friend)
Out of curiosity, which university are you talking about? I'm guessing UBC, as I seem to recall SFU having some sort of deal with major cell phone companies.
This I think, would not be possible.
You might be able to dig up, slap togeather and in some way get into an operating state, the needed basic components for a GSM network (MSC, HLR/VLR, SMSC etc) but you will most probably not be allowed to transmit on any frequency that normal handsets can use, and even if your country doesnt regulate or give you permission to do it you will still be faced with the issues of getting an IMSI range, a number series, implementning number portability (it applicable), producing SIM-cards etc. And as pointed out already, you will probably not be able to get a roaming agreement with any operator, thus your users would have to change SIM to use your network (or have a second handset).
All in all I think its best to leave this project be. GSM networks are not cheap or open. Period.
When in danger, whewn in doubt! Run in circles, scream and shout!
I sure wish the major cell phone companies would Shut the Fuck Up, or at least that some of their customers would...
VoIP is popular in Australia, with companies (cf MyNetFone.com.au) offering service with NO monthly fees (& about 10 cents/2 hr call, to landlines in Oz)... and the COOL thing is: Free SIP to SIP fone
Why not skip the phone numbers & go SIP to SIP - on Community Mesh
Networks? Or, if you must dial those outside the SIP circle, use a
VoIP carrier (like MNF) & pay 10 cents per call, instead of 30c/min
If its open and free its used to trade child pornography!
or even worse, pirated music! SOMEBODY, THINK OF THE CHILDREN!
Fido http://www.fido.ca/portal/en/packages/monthly.shtm l
h tmli ndex.shtml
/ plans_and_options.asp
Unlimited incoming: $25
Any time: $20
Fido to Fido: $25
Telus http://www.telusmobility.com/bc/plans/pcs/index.s
Talk a lot 20: $20
Urban Talk 30: $30
Or there's their prepaid plans which can be cheaper if you don't call much: http://www.telusmobility.com/bc/plans/payandtalk/
Rogers/Cantel http://www.shoprogers.com/store/wireless/services
MegaTime from $20
I'm not sure how much you expect cellphone service to cost; but $20-30/month (note each plan has a system access fee of about $8) is pretty reasonable, and many offer free or cheap phones.
Live simply, that others may simply live. -Gandhi
GSM is not designed for private networks, so forget it. What you want is DECT. DECT is a standard for cordless phones. It scales from a single cordless phone connected to a fixed line to business systems that cover a whole campus and connect to a PBX, making it easy to integrate to your existing infrastructure.
You can find dual DECT/GSM phones that seamlessly switch between the two networks. Here is a example of a DECT solutions vendor, which has a full range of offers: http://www.diacom.ie/kirk.htm.
Best bet would be a campus wide 802.11 network and use some wireless VOIP phones. Asterisk could connect it to the PSTN.
Get everyone to get a phone like this:t s_id=802
http://www.voipsupply.com/product_info.php?produc
Install Trixbox on a healthy server for your voip gateway:
http://www.trixbox.org/
If you put the server on the local campus network and the campus is covered with Wi-Fi, bam you are done. If you can put the server on a public static IP then everyone with one of these phones can make a call to someone else with one of these phones where ever VOIP can travel over the internet. If you really wanted to, you could add a few lines via VOIP suppliers to offer outbound calling. You could charge a small monthly and get unlimited minute VOIP lines for outbound calls. Inbound calls could be routed via DID but that is a lot bigger than you wanted.
I think you can use Asterisk paired with Celliax, with the right hardware. It comes as a channel module: http://www.celliax.org/
The question remains: if $30 a month is too much, just how much do you want to spend?
I have, or have had, relationships with the various providers. Not necessarily for cellphones.
Telus do my home phone and ADSL. I have no complaints. If I wanted a cellphone I'd give them first right of refusal.
Bell Mobility are OK if you're a consumer wanting a cellphone, but need to get their act together for anything else. I'm doing some Brew CDMA development at work and they are somewhat less than cooperative. So I drive down to the border and test things with Sprint.
Fido can go fuck themselves.
I've never gotten anything other than cable TV from Rogers.
...laura
I'm not sure about the US, but in Europe there are cell companies that give a special price plan when you are in the office.
The idea is to make businesses give up on the landline entirely. That could be an alternative to the DECT/GSM combo - if you can get such a deal.
Yes, I am a biological organism. All rumors to the contrary are just that, rumors.
I began working on some software about this about 18 months ago. I worked on it for about 2 months (in spare time) and found that it was possible but would require trust and 'goodwill'. Something that I dropped because of this.
.....
Anyhow, it worked in this way. Phones with bluetooth have about a ten metre range. A phone will maintain a list of those phones within its range (running the listening software). Then, just as 'router man' developed the router to route packets of data, the phone could route sms (or text) messages. Those people with bluetooth constantly turned on and with the right software installed could sms people where a direct line could be established from source to destination. Each phone could act as both a client and router. Battery time was vastly decreased.
The big problems I ran into was having to write new reversible walk algorithm for unstructured, deformable meshes. I know this is possible but, damn it, just am not that smart.
I'd love to get coding on this again. In a large city this could work very well, well enough for voice communication. I know that people do love to do stuff for the greater good, but whenever I get on the torrent network, I see at most 5 million people worldwide. You need more than this in each nation. You could also hijack other bluetooth networks, but
.
What are you smoking?
There are practically 4 companies: Cingular, T-Mobile, Verizon, and Sprint.
And all plans practically start at $40, while they charge you ridicilous amounts for text messaging -- a service that reduces stress off their network.....
I was told that in India the situation is much much better....
I would think that FRS radios would be the ideal solution for free wireless communication on a small college campus.
Fido/ROGERS (you forgot that they're the same company): $0.25 per minute if you do live on the 401 (about, I'd guess, 8% of Canada's population lives nearby it), $7.45 per month additional required fees. Note that while the GSM spec requires the transmission of caller ID, Fido/ROGERS scrubs it at the CO unless you pay about $5/monthly. You can avoid the $0.25 per minute fees by paying $5 monthly to access the ROGERS network that Fido/ROGERS owns anyways. Long distance is 6x the equivalent land-line plan.
# 30 per minute: long-distance rate within Canada and to the U.S.
# Monthly system access fees of $6.95 (non-government fee), a monthly 911 emergency service fee (50), taxes, long-distance and roaming charges, as well as other charges are not included. Each additional minute of local calls costs 30, 35 for Couples packages and 10 with the 100/1000/Unlimited package. Unlimited packages and options are subject to Fido's Acceptable Use Policy. Some conditions apply. Fido is a registered trademark of Fido Solutions Inc. Unlimited local calls exclude calls made through Call Forwarding. Airtime used for calls made and received on the expanded network is not included in your monthly package and cost 25 per minute. Couples packages are available with a Fido Agreement per subscriber and can only be activated and shared among subscribers within the same local calling area. Unlimited local calls for Couple packages are between Couple subscribers within the same account. Couple packages can be shared by up to five subscribers with a Fido Agreement per subscriber but need, at all times, a minimum of two subscribers in the same account in order to remain activated. Subject to Fido's Acceptable Use Policy. Some conditions apply. Fido is a registered trademark of Fido Solutions Inc.
Telus: $20 buys you 50 minutes. Need I say more? Sure, why the hell not. First twelve months $10.62 additional, after that, $7.70 additional per month. Long distance 6x land-line prices.
additional charges
additional local minute rate: 30/minute
directory assistance 411 charge: $1.50 call plus airtime
one time account set-up charge: $35
long distance charges
Canada to Canada; Canada to U.S.: 30/minute
U.S. to U.S.; U.S. to Canada: 50/minute
U.S. roaming rate: 95/minute
monthly system access fee $6.95
monthly enhanced 911 emergency service access charge 75
Telus prepaid: $2.92 monthly charge for the first 12 months additional. $10/monthly minimum fee. $10 card buys you a maximum 23 minutes talk time. Slightly better price on long distance, only 5x land-line prices. What I do like about prepaid is the how BS like "System Access Fees" get put in the price like they should be when consumers have easy access to the information before buying time.
one time account set-up charge
full serve through client care: $35
monthly enhanced 911 emergency access charge 75/month
Rogers/Cantel: Add $10.87 monthly for the first year. Drops to about $7.50 additional per month after that. Long distance is "only" 6 times more expensive than with any regularly discounted land-line. Note that while the GSM spec requires the transmission of caller ID, Rogers/Cantel scrubs it at the CO unless you pay about $5/monthly.
Other Important Costs and Details:
A System Access Fee of $6.95/month is additional*
A 911 Fee of $0.50/month is additional
A one-time Activation Fee of $35.00 is additional
Additional airtime is $0.30 / minute
Wireless voice calls are billed by the minute
$0.30 per minute for long distance calls within Canada and to the U.S.
$0.95 (CDN)/minute for local calls from your Digital TDMA or GSM phone while roaming in the U.S. (wherever roaming is available).*
$1.25 (US)/min
http://www.mobilecomms-technology.com/contractors/ inbuilding/ip_access/
I've thought abt this, since it wud become an ideal solution for communication in rural areas (forgetting the spectrum issues!), with handset costs at an all time low !! Well, Vanu http://www.vanu.com/ has come up with a good solution, wherein high performance commodity PCs are used for software DSP. In the open domain, we have GnuRadio http://www.gnuradio.org/trac/ doing great work in developing algorithms. Also a project is underway for decoding GSM signals off the air http://www.thc.org/gsm/. May be someday, it can build up into a really working opensource BTS !! Cheers..
You can run it using ClusterKnoppix. I don't know if you have to download the package, but I do know that I saw it in the package list.
The college itself might be able to acquire some bandwidth licenses in the 450MHz spectrum from the government and then you could run CDMA450 cellphone equipment. CDMA450 is not used by any public carriers in the US or Canada, but is used in China, southeast Asia, Russia, eastern Europe, Central American and African countries using infrastructure equipment made by Nortel available today on the market and handsets are made by Nortel and Huawei. One benefit of the 450MHz spectrum is that it penetrates buildings much better and covers terrain and foliage much better than 850 thru 1900 MHz so you could probably cover an entire college campus area with only a single antenna site on the roof of a building on campus.