Hi,
My intention is setting up a small dedicated box with a PC and some RF hardware for GSM1800. The usage will be mainly SMS and EDGE.
Is it still recommended using something like a nanoBTS, with the nitb setup? These are relative cheap, professionally designed. UmTRX looks great, but it is above the financial limit.
It will be an experimental setup, but more for demonstrational purpose, so I love the idea of some nice looking plug and play box. It is not intended to extend it, no hand over, no roaming stuff, no interconnection other than IP and maybe SIP.
For testing still I have my B210 and a BladeRF, but I do not want to waste such a versatile SDR for some stupid test BTS stuff :)
Thanks for any input!
Ralph.
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Ralph A. Schmid Mondstr. 10 90762 Fürth +49-171-3631223 ralph@schmid.xxx http://www.bclog.de/
Hi,
On 26.01.2016 12:51, Ralph A. Schmid, dk5ras wrote:
My intention is setting up a small dedicated box with a PC and some RF hardware for GSM1800. The usage will be mainly SMS and EDGE.
Which EDGE specific (in comparison to GPRS) features do you need?
Jacob
Hi,
Which EDGE specific (in comparison to GPRS) features do you need?
No specific features, EDGE just would be nice by means of throughput and latency. I do not intend to set up strange combinations. In case EDGE is not possible, GPRS will do just fine for demo purposes, too.
I have such a demo box already, but it is some prototype, development on it has stopped a time ago, so it is kind of "static". The demo box should not be updated with all untested features all the time, but no updates at all are a bit lame :-) Also its 19" form factor is not very portable, and the transceiver board is somehow bulky, too. I would have built it into a nice housing if it had a future, but it is a dead end now.
Jacob
Ralph.
Hi Ralph,
What we do at the university is just using the upper ARFCNs (882-885), because the 20MHz LTE the owner of this part of the band use is allowing almost 0.8MHz "free" spectrum. THe guard band is designed for high power transmitters, for testing we are using 100-200mW Tx power, so we are very far from bleeding into the actual used portion of the operator, so we are not creating any interference, and we always check the availability of the spectrum with analysis.
I think the key for short term low power proejcts is to always check for available spectrum, never create any interference, and newer try to mimic a commercial operator by using their MCCMNC code and/or the operator name, and if your network is out in the air, always make it a closed one and make sure the commercial users will be properly reject (with PLMN not allowed reject cause).
Of corse this is not a legal advice, but we are doing so for years now, and nobody ever complained :-)
If you check carefully, the law is actually not prohibiting the use of licensed portion of the spectrum (eg. interfering), but punishes the possible conseqences (loss of revenue, disturbing a public telephony service, someone dies because of your interference he/she cannot call the ambulance etc.). Until you do not meet any of those circumstances, you will be fine.
Regards, Csaba
----- Eredeti üzenet ----- Feladó: "Ralph A. Schmid, dk5ras" ralph@schmid.xxx Címzett: "Jacob Erlbeck" jerlbeck@sysmocom.de, openbsc@lists.osmocom.org Elküldött üzenetek: Kedd, 2016. Január 26. 14:32:33 Tárgy: RE: Hardware question
Hi,
Which EDGE specific (in comparison to GPRS) features do you need?
No specific features, EDGE just would be nice by means of throughput and latency. I do not intend to set up strange combinations. In case EDGE is not possible, GPRS will do just fine for demo purposes, too.
I have such a demo box already, but it is some prototype, development on it has stopped a time ago, so it is kind of "static". The demo box should not be updated with all untested features all the time, but no updates at all are a bit lame :-) Also its 19" form factor is not very portable, and the transceiver board is somehow bulky, too. I would have built it into a nice housing if it had a future, but it is a dead end now.
Jacob
Ralph.
-
Jacob Erlbeck -
Ralph A. Schmid, dk5ras -
Sipos Csaba