[osmocom-event-orga] good news everyone: BTS and bands

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Frank Rieger frank at ccc.de
Tue Nov 13 16:23:21 UTC 2018


I have no word from Deutsche Telekom so far. Has anyone else progress with other operators or the BNetzA?

Frank

---

> On 13. Nov 2018, at 17:10, Neels Hofmeyr <nhofmeyr at sysmocom.de> wrote:
> 
> So, today I rummaged throught the event pool boxes at sysmocom office.
> 
> Turns out:
> 
> a) I can find only two BTS in there. There are four amplifier+duplexer wooden
> boards, but only two of them have a BTS on them. Does anyone know where the
> other two went?
> 
> b) The good news is: both BTSes that I tested are quad band, i.e. they support
> whichever band we want. Lynxis and I also each have one quad-band sysmoBTS. So
> we have at least four BTS available now, I assume it will be six in the end.
> (Details: a sysmoBTS is physically limited to specific bands. Which bands are
> supported is indicated in the EEPROM, and if you configure osmo-bts.cfg with a
> band that isn't supported, you get, during osmo-bts startup:
> "DL1C <0006> l1_if.c:1453 BTS band GSM850 not supported by hw"
> i.e. the two that worked at AfRA on sunday positively support the 850 band.)
> 
> c) To transceive with 2W, we need amps and duplexers.
> 
> The current four amps in the event pool are 1800; sysmocom has more than enough
> lo-band amp boards that we could replace in these amps with "minimal mechanical
> effort".
> 
> Sysmocom has three 850 duplexers available that we can transfer to the event
> pool.
> 
> 
> In summary:
> 
> If we get 850MHz spectrum:
> We are limited by duplexers to three sysmoBTS 850MHz on 2W, and could setup
> another one to three sysmoBTS 850MHz on 200mW.
> 
> If we get 1800MHz spectrum:
> We can have four BTS on 2W like last year, and could setup two more on 200mW.
> There are also two 1800 nanoBTS in the pool.
> 
> This is pretty good news, it means that whichever spectrum we get, we can do 2G
> with at least three 2W cells. Now let's wait/hope for at least one license
> confirmation, I think that is quite likely to happen.
> 
> Maybe we can even get both 850 and 1800, then we could do 2G on 1800 and 3G on
> 850. There are eight nano3G in the event pool, plus some more from me, lynxis,
> maybe others.
> 
> ~N




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