OpenBSC October 2021

openbsc@lists.osmocom.org

11 participants
24 discussions

Amplifier Settings
by Henry Caga 18 Oct '21

18 Oct '21

Hello, im Using a default configuration for my osmo-bsc setup using B210. I managed to get a working amplifier with specifications below. My question is, what should be the best config that i should use in order to maximize tge power and range of my amplifier? What are the best configs for osmo-trx, osmo-bts, and other applications related to osmo-bsc. Proper settings such as osmotrx tx-attenuation, nominal power, ms max power and other related configurations that are valid or matched for my amplifier. Listed below is my amplifier's specification. AMPLIFIER SPECS: band: uplink 885-915MHz / downlink 930-960MHz Max output power: downlink 47±1dBm Max allow input power: uplink -10dBm / downlink +10dBm gain: Uplink 25±2dB Downlink 28 to 53±1dB ALC: Uplink ≥10dB Downlink ≥10dB SWR: Uplink ≤1.5 Downlink ≤1.5 Passband ripple: Uplink ≤2dB Downlink ≤2dB Noise floor: uplink ≤2dB third order intermodulation: Uplink ≤-55dBc@-8dBm/ch/2ch Downlink ≤-36dBc@2ch Voltage: 28V Currency: ≤4.5A Thanks a lot! Henry

1 0

Question about Virtual-Um implementation
by Ivan Babanov 08 Oct '21

08 Oct '21

Hello all, We trying to bring up set of BTS with virtual Um with different configurations: 1 BTS -> 1 TRX -> 1 MS works fine as expected 1 BTS -> 1 TRX -> 2 MS works fine as well But I see some unpredictable behaviour when I have 1 BTS -> 2 TRX(872,873) -> 1 MS MS can attach on one ARFCN (872) but when it tries to attach on 873 looks like PRACH does not reach BTS and I do not see Channel Request on BSC side. So, the question is it workable configuration: Several TRX to 1 MS with different power level to allow MS to choose a best cell to attach? I have just one idea: to have several virtphy instances for MS connected to different UDP ports. Thank you Vania

1 0

LCLS
by Keith 06 Oct '21

06 Oct '21

Hi All, I was again looking at advancing with LCLS support. I've made a couple of proposals, which at least get it to the stage where the global call reference it consistent from the A leg to B leg of a call, with both the internal mncc and external, and therefore osmo-bsc can make use of either the lcls-mode (mgw|bts)-loop. The implementation in the osmo-sip-connector doing nothing more than passing the GCR from leg to leg, but it's more complicated than this. We need to allow the PBX to have the audio streams until the PBX itself decides to remove itself from the stream. (as it is you won't even hear ringback) I know all this is spec-ed somewhere in LCLS, I'm just not sure where/how this SIP re-INVITE processing should be implemented, in the sip conn, or the MSC - which I guess, takes us back again to neels' long standing proposals for parsing SDP inside the MSC. Maybe it' s time to get that merged. Anyway.. I have some time scheduled to try to move this forward towards a definitive solution, just writing here in case anyone else can help. Thanks. k/

2 2

Nano 3G Femtocell request
by Americo Colella 04 Oct '21

04 Oct '21

Hello everyone,I would like to play eith the nano 3g femtocell, Is there anybody who want to give it away /sell one ? Thanks a lot, Americo

1 0

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

OpenBSC October 2021