OpenBSC March 2024

openbsc@lists.osmocom.org

13 participants
15 discussions

by mosbah abdelkader

> I don't understand. This callback will be called with data you need to write > to the network. In case of MTP Level3 you will need to wrap that around the > msgb you got. I means: is the interaction with mtp3 layer implemented (is sending sccp data by mtp3 implemented by the library?)? Also, what about the reception of data from mtp3 layer. is that implemented in the sccp lib. I am asking these questions because I see the code of mtp3 in the lib but no significant call is present in the sccp part of the lib. Thank you for your help.

4 weeks

dynamic traffic channels

by Neels Hofmeyr

On Tue, Jun 28, 2016 at 10:05:28AM +0200, Harald Welte wrote: > [translated from german] > is it certain that we switch a channel to PDCH only when > gprs mode != none? A TS can be GSM_PCHAN_TCH_F_PDCH; those are the only ones for which we send a PDCH ACT message. We send a PDCH ACT message - during init (CHANNEL OML's state changed to enabled -> send PDCH ACT), - and upon channel release ack when pchan == GSM_PCHAN_TCH_F_PDCH. So the question is, when we receive a channel release ack, could that be the PDCH release and we switch PDCH right back on by accident? No, because we only receive a chan rel ack when the *TCH/F* is being released. That is because the PDCH release is initiated "internally" from the PDCH DEACT, and thus this condition in common/rsl.c rsl_tx_rf_rel_ack() catches on, which existed before dyn PDCH: if (lchan->rel_act_kind != LCHAN_REL_ACT_RSL) { LOGP(DRSL, LOGL_NOTICE, "%s not sending REL ACK\n", gsm_lchan_name(lchan)); return 0; } In rsl_rx_rf_chan_rel() the rel_act_kind is set to LCHAN_REL_ACT_RSL, but not in the rsl_rx_dyn_pdch(). This is analogous to the ip.access way -- the ip.access nanobts replies to a PDCH DEACT with a PDCH DEACT ACK and doesn't send a separate channel release ack. Maybe we could set rel_act_kind to some new LCHAN_REL_ACT_IPAC_DYN_PDCH for clarity? (But we shouldn't actually send a release ack, to stay compatible.) Even though it works as-is, we should indeed add another flag check: - We do check the flags that no ACT/DEACT is already pending; - And we do send a PDCH DEACT only if ts->flags & TS_F_PDCH_ACTIVE; - But we would send a PDCH ACT despite ts->flags & TS_F_PDCH_ACTIVE. This should never happen, but it would make sense to ensure that. ~Neels

1 month

GSMTAP new version (3?)

by Mauro Levra

Dear Osmocom developers, In our project we have been using the gsmtap pseudo-header to store UMTS and LTE signalling traces in pcapng format. This is very efficient compared to our previous implementation based on DLT_USER, and thanks to the gsmtap dissector, it allows any *shark app to read our output file. When looking for the proper type and sub_type for NR signalling traces, I discovered they are not yet part of the standard. I found several threads of discussion about this, from about 2017 onwards, and I understand it is a matter of time and resources if the version 3 of GSMTAP has not been released. The most interesting feature I have read about is the ability to extend the header with a TLV approach. EARFCN, eNodeB-ID, PCI, are useful metadata we would like to add to our traces. In an ideal world, I would like things to be put in motion so that a new version of GSMTAP could see the light. More humbly, I ask you what kind of help is needed. Are you waiting for a draft specification? Are all requirements well known? I suppose that LTE and NR are not the main focus today for liboscmocore development, but there are many projects out there waiting for the GSMTAP format to be updated. Thanks! Mauro

1 year, 1 month

Channel Requests not being responded when running CS-only 2G network

by JPichel

Hi, I am trying to setup a simple Network In The Box 2G network. I am only interested in CS capabilities (voice calls, SMS, USSD). I am currently running the following elements with the default configurations: - osmo-bts-trx (connecting to osmo-trx-uhd driving a USRP B205mini-i) - osmo-bsc - osmo-msc - osmo-hlr - osmo-mgw - osmo-stp I built all the programs from source on Ubuntu 22.04. Everything is running locally on one machine. Everything seems to function correctly at first, but I noticed that sometimes when I try to execute an USSD code or make a call, my Channel Requests are not being responded. I noticed when this happens, osmo-bts shows the following notice: DPCU notice PCU socket not connected, dropping message (pcu_sock.c:1018) As I understand from the documentation (https://osmocom.org/projects/cellular-infrastructure/wiki/Osmocom_Network_I…), this component is not required for circuit switched services as the ones I am requesting, so I do not understand why this is happening. I assume something in the configuration files is telling the BTS or some network element that the PS side of the network is active, but I haven't found anything related to PCU in any of configuration files.

1 year, 2 months

DevCon: CSFB proposol / a general playground

by Keith

While I'm here looking at the mailing list, I have been thinking about asking about the following, and no need to delay it, I suppose - Upcoming OsmoDevCon attendees may have noticed the proposed and scheduled session on CSFB testing. Well, since - and sort of because that session was accepted, (and also an iPhone 6 that supports the band of an eNB I have at home dropped into my possession) - I've been prompted to advance my knowledge and understanding of issues, and the iPhone (6 at least) is now doing MO CSFB perfectly, and I think I see what some other observed issues are about. I'm still happy if there's interest to do the session of course, although maybe some might question whether it is more productive to just file tickets/issues and work them out the usual way. This email is not to suggest in any way to cancel the session, but rather to ask if maybe we might expand the scope. I'm thinking for example also testing 2G data. The older basic 2G + GPRS "chocolate bar" type phones I have don't work anymore, they used to. (not sure what one might actually do with such a device and GPRS these days, but that's not the point, right?) Someone (vadim?) brought a 2G (was it a credit card?) terminal once to devcon. Does it work? that kind of thing. So thinking about all this, I'm asking the question of whether there is interest to have a kind of events style setup during the conference. lynxis I think has a server for that, or maybe it's only a VM? I don't mean a distracting always-on setup, and I don't mean to put emphasis on cellular projects. But if we did want to have something multi RAT, available for anybody who might want to glance in that direction (during a USSE for example), then some (small) amount of logistics preparation is necessary, no? Thanks. k.

1 year, 2 months

PyHSS / pyhss-tool

by Harald Welte

Hi all, While working with open5gs + kamailio, one traditionally always needed two HSS: * the open5gs one with its mongodb and nodejs hell * the FHoSS one for the kamailio IMS core For some time there's now PyHSS, which supports both EPS and IMS subscriptions, which is of course nice. docker_open5gs meanwhile also has switched to using it as default. The big problem is that it doesn't actually state which license it is under, which makes it legally impossible to [re]distribute it, or to even make a fork of the repository, as that would be a violation of copyright. At least German users are abel to legally use it, as under German copyright law you don't need a license from the copyright holder to use a program that you have obtained legally. In order to automatize the steps described in the open5gs_docker to create subscribers, I've just hacked up a small tool, see https://gitea.osmocom.org/laforge/pyhss-tool/src/branch/master/pyhss-tool.py Using that tool, it's as easy as pyhss-tool.py subscriber-create --imsi 001011111111111 --msisdn 1111 --k 000102030405060708090a0b0c0d0e0f --opc 00000000000000000000000000000000 or pyhss-tool.py subscriber-delete --imsi 001011111111111 to add/remove subscribers. You will still need to manually create the internet and ims APNs via the REST interface; I'll probably also add that capability to the tool. Once it's a bit more tested, I also would like to contribute it upstream, at least once that is possible. To do that I'd have to make a pull request, and making that pull request requires me to create a fork, which is a copyright violation. wtf. If that legal situation has cleared up, it might be worth considering either adding native GSUP support to PyHSS (so it can be used by osmo-{msc,sgsn}, or to have a converter like osmo_gsup2dia (the inverse of the existing osmo_dia2gsup). Regards, Harald -- - Harald Welte <laforge(a)osmocom.org> https://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

1 year, 3 months

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1 year, 3 months

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1 year, 3 months

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1 year, 3 months

Excel in NURS FPX 4010 Assessments with Our Expert Online Tutoring

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1 year, 3 months

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OpenBSC March 2024