OpenBSC July 2015

openbsc@lists.osmocom.org

14 participants
18 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

[PATCH 0/4] core/conv: Fast Viterbi decoding

by Thomas Tsou

Hi all, This patch set adds to libosmocore an optimized Viterbi decodeer for architecture specific (Intel SSE) and non-specific cases. The implementation covers codes with constraint lengths of K=5 and K=7 and rates 1/4 to 3/4, which make up the majority of GSM use cases. Speedup from the current implementation is in the range of 5 to 20 depending on the processor and code type. API is unchanged. Tested on Haswell (i7-4770K) and Atom (D2550). Additional test codes from osmo-bts are included. Further tests for AWGN bit-error-rate and benchmarks can be found in the following repository. https://github.com/ttsou/osmo-conv-test Here are some examples. Bit error test for GPRS CS2 with SNR of 5 dB and 100000 bursts. $ ./conv_test -c 2 -e -r 5 -i 100000 ================================================= [+] Testing: GPRS CS2 [.] Specs: (N=2, K=5, non-recursive, flushed, not punctured) [.] Input length : ret = 290 exp = 290 -> OK [.] Output length : ret = 588 exp = 588 -> OK [.] BER tests: [..] Testing base: [..] Input BER.......................... 0.042443 [..] Output BER......................... 0.000006 [..] Output FER......................... 0.001350 (135) [..] Testing SIMD: [..] Input BER.......................... 0.042460 [..] Output BER......................... 0.000005 [..] Output FER......................... 0.001240 (124) Timed AFS benchmark with 8 threads and 100000 bursts per thread. $ ./conv_test -b -c 10 -j 8 -i 100000 ================================================= [+] Testing: GSM TCH/AFS 6.7 [.] Specs: (N=4, K=5, recursive, flushed, punctured) [.] Input length : ret = 140 exp = 140 -> OK [.] Output length : ret = 448 exp = 448 -> OK [.] Performance benchmark: [..] Encoding / Decoding 800000 bursts on 8 thread(s): [..] Testing base: [..] Elapsed time....................... 4.320001 secs [..] Rate............................... 25.925920 Mbps [..] Testing SIMD: [..] Elapsed time....................... 0.458272 secs [..] Rate............................... 244.396341 Mbps [..] Speedup............................ 9.426718 -TT

9 years, 1 month

[PATCH libosmo-netif 00/18] add dummy padding support

by pablo＠gnumonks.org

From: Pablo Neira Ayuso <pablo(a)netfilter.org> The following patchset, although it looks a bit large, it is composed of many small incremental changes to improve the existing osmux infrastructure and to add dummy padding support. The dummy padding consists of a osmux header and payload that looks like this: OSMUX seq=000 ccid=002 ft=2 ctr=3 amr_f=0 amr_q=0 amr_ft=03 amr_cmr=00 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ] The frame type is OSMUX_FT_DUMMY (=2) in the batch that whose payload is padded with 0xff. Note that the message above is padding the circuit ID 2. This is used for early bandwidth preallocation in links that involve relatively slow dynamic bandwidth allocation such as Iridium/OpenPort. The osmux test infrastructure has been improved (to resolve some memleaks) and enhanced to cover this new dummy support. The OpenBSC changeset is composed of one very small patch that will come after this batch. If no major concerns, I'll push this initial batch soon into the repository. Thanks. Pablo Neira Ayuso (18): osmux: discard non voice osmux message osmux: add osmux_input_state structure osmux: add circuit helper functions osmux: rename struct batch_list_node to osmux_circuit osmux: rename circuit->list to circuit->rtp_list osmux: pass up struct osmux_batch osmux: count pending messages to be transformed in the batch osmux: introduce osmux_xfrm_input_close_circuit() osmux: introduce osmux_xfrm_input_open_circuit() tests: osmux: adapt it to use the new circuit API tests: osmux: factor out main test loop tests: osmux: test online deactivation of dummy padding tests: osmux: validate dummy padding with no voice data interaction tests: osmux: test circuit reopening after closure osmux: kill osmux_get_hdr() tests: osmux: fix msgb leaks tests: compile tests with debugging symbols, ie. -g tests: osmux: iterate 64 times in osmo_test_loop() include/osmocom/netif/osmux.h | 8 +- src/osmux.c | 374 ++++++++++++++++++++++++++--------------- tests/Makefile.am | 2 +- tests/osmux/osmux_test.c | 80 ++++++--- 4 files changed, 304 insertions(+), 160 deletions(-) -- 1.7.10.4

9 years, 10 months

Using GPRS

by OMAR RAMADAN

Hi list, I've installed omsocom for the first time on a USRP B200 and I'm interested in trying out the GPRS stack. I've followed a few pages on the wiki, namely http://openbsc.osmocom.org/trac/wiki/network_from_scratch and http://openbsc.osmocom.org/trac/wiki/OpenBSC_GPRS to get set up and I am not sure how up to date these tutorials are. I have calls working via the LCR, but I cannot get GPRS functioning. I see no activity on the BSC log when attempting GPRS attach using APN openbsc. I also see no traffic between the SGSN and the BSC (listening with tshark on 127.0.0.1:23000). Any help is appreciated. I am currently using osmo-trx/master, osmo-bsc/jolly/testing, libosmo-abis/jolly/multi-trx, omso-bts/jolly/trx, openggsn/master, and osmo-pcu/master. Best, Omar

9 years, 10 months

MNCC and LCR

by ☎

Hi all. One of the options for call routing for OpenBSC is LCR. They talk to each other over MNCC which is nice versioned protocol. What puzzles me most is the version difference: OpenBSC: openbsc/include/openbsc/mncc.h:166:#define MNCC_SOCK_VERSION 4 LCR: mncc.h:333:#define MNCC_SOCK_VERSION 5 The OpenBSC is latest from git://git.osmocom.org/openbsc master branch, the LCR is latest from git://git.misdn.eu/lcr.git, master branch as well. So, what am I missing? Where does this version difference comes from? On a related note - the MNCC code in OpenBSC is part of libbsc but there's no such package or library when I'm building .deb for example. If we could split off MNCC implementation into separate library (libmncc? libosmocore?) and use it from both LCR, OpenBSC (and whatever else we might want to use in future) than it would solve such versioning and compatibility issues once and for all. What do you think? -- best regards, Max, http://fairwaves.co

9 years, 10 months

[PATCH 1/2] nitb: Be less strict about the reject cause

by Holger Hans Peter Freyther

From: Holger Hans Peter Freyther <holger(a)moiji-mobile.com> When we can't find the TMSI then the subscriber is not in our VLR. We have not consulted with the HLR and it is better to not use such a severe error code. --- openbsc/src/libmsc/gsm_04_08.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/openbsc/src/libmsc/gsm_04_08.c b/openbsc/src/libmsc/gsm_04_08.c index 29ab2ba..e380d94 100644 --- a/openbsc/src/libmsc/gsm_04_08.c +++ b/openbsc/src/libmsc/gsm_04_08.c @@ -968,7 +968,7 @@ static int gsm48_rx_mm_serv_req(struct gsm_subscriber_connection *conn, struct m /* FIXME: if we don't know the TMSI, inquire abit IMSI and allocate new TMSI */ if (!subscr) return gsm48_tx_mm_serv_rej(conn, - GSM48_REJECT_IMSI_UNKNOWN_IN_HLR); + GSM48_REJECT_IMSI_UNKNOWN_IN_VLR); if (!conn->subscr) conn->subscr = subscr; -- 2.3.5

9 years, 10 months

OpenBSC + Huawei BTS 3900B

by Роман Жогов

Hi all. I'm working on probation on mobile operator as a student. Currently, I'm trying to create site for testing, using Huawei BTS 3900B and OpenBSC software. But I can't set up it. I have a several questions: 1) Huawei BTS uses Abis over IP, how can I connect this BTS to OpenBSC. 2) Are there any examples of configuration in this case? Thanks.

9 years, 10 months

osmo-nitb hangs with large hlr.sqlite3 file

by F Abdu

Dear Experts, Hello, I am running a gsm system with followings: OpenBSC version: 0.13.0.319-30e0e LCR version 1.14 astersik version 1.8.10.1 The system is sited is a busy area. The system works fine for few days but hangs once the hlr.sqlite3 file size reaches near 12 MB and that causes the osmo-nitb to take 99% of the cpu usage. I used "./osmo-nitb -m -P -C" to run the system. The hlr.sqlite3 file increases @2MB/Day. The 'Subscriber' table of the hlr.sqlite3 file adds a large number of IMSI with authorized=0. Tables like Counters, Eqipment and EquipmentWatch are filling up with lots of data. Now the only solution to this problem is to manually delete the data from the tables. May I get some light to solve the issue form the experts like you all? With regards. [ Content from the openbsc.cfg file is as following: ! ! OpenBSC configuration saved from vty ! ! password foo ! line vty no login ! e1_input e1_line 0 driver ipa network network country code XXX mobile network code XX short name Test long name Test auth policy closed location updating reject cause 13 encryption a5 0 neci 1 rrlp mode none mm info 0 handover 0 handover window rxlev averaging 10 handover window rxqual averaging 1 handover window rxlev neighbor averaging 10 handover power budget interval 6 handover power budget hysteresis 3 handover maximum distance 9999 timer t3101 10 timer t3103 0 timer t3105 0 timer t3107 0 timer t3109 4 timer t3111 1 timer t3113 60 timer t3115 0 timer t3117 0 timer t3119 0 timer t3141 0 bts 0 type sysmobts band GSMXXX cell_identity X location_area_code X training_sequence_code 7 base_station_id_code 63 ms max power 30 cell reselection hysteresis 4 rxlev access min 0 periodic location update 100 channel allocator ascending rach tx integer 9 rach max transmission 7 ip.access unit_id XXXX 0 oml ip.access stream_id 255 line 0 gprs mode none trx 0 rf_locked 0 arfcn XXX nominal power 23 max_power_red XX rsl e1 tei 0 timeslot 0 phys_chan_config CCCH+SDCCH4 timeslot 1 phys_chan_config SDCCH8 timeslot 2 phys_chan_config TCH/F timeslot 3 phys_chan_config TCH/F timeslot 4 phys_chan_config TCH/F timeslot 5 phys_chan_config TCH/F timeslot 6 phys_chan_config TCH/F timeslot 7 phys_chan_config TCH/F

9 years, 10 months

[PATCH 1/3] use non-vararg functions if possible

by Max

Signed-off-by: Max <max.suraev(a)fairwaves.co> --- openbsc/src/libmsc/db.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/openbsc/src/libmsc/db.c b/openbsc/src/libmsc/db.c index 428f99b..035202d 100644 --- a/openbsc/src/libmsc/db.c +++ b/openbsc/src/libmsc/db.c @@ -301,7 +301,7 @@ static int update_db_revision_3(void) dbi_result_free(result); /* Cycle through old messages and convert them to the new format */ - result = dbi_conn_queryf(conn, "SELECT * FROM SMS_3"); + result = dbi_conn_query(conn, "SELECT * FROM SMS_3"); if (!result) { LOGP(DDB, LOGL_ERROR, "Failed fetch messages from the old SMS table (upgrade from rev 3).\n"); @@ -1095,8 +1095,8 @@ int db_subscriber_list_active(void (*cb)(struct gsm_subscriber*,void*), void *cl { dbi_result result; - result = dbi_conn_queryf(conn, - "SELECT * from Subscriber WHERE LAC != 0 AND authorized = 1"); + result = dbi_conn_query(conn, + "SELECT * from Subscriber WHERE LAC != 0 AND authorized = 1"); if (!result) { LOGP(DDB, LOGL_ERROR, "Failed to list active subscribers\n"); return -1; -- 2.1.4

9 years, 10 months

[PATCH openbsc] osmux: add option to pad the circuit with dummy messages

by pablo＠gnumonks.org

From: Pablo Neira Ayuso <pablo(a)soleta.eu> Iridium is a satellite network which operates a GPRS-like that allows you to get speeds up to 128kbit/s. However, it takes from 5 to 6 secs to get the bandwidth allocated, so the conversation is garbled during the time. This patch uses the new dummy padding support in libosmo-netif that is controlled through the osmux osmux_xfrm_input_open_circuit(). This includes a new VTY option for osmux. --- openbsc/include/openbsc/mgcp.h | 4 ++++ openbsc/src/libmgcp/mgcp_osmux.c | 7 +++++++ openbsc/src/libmgcp/mgcp_vty.c | 16 ++++++++++++++++ 3 files changed, 27 insertions(+) diff --git a/openbsc/include/openbsc/mgcp.h b/openbsc/include/openbsc/mgcp.h index f334ac8..1f63803 100644 --- a/openbsc/include/openbsc/mgcp.h +++ b/openbsc/include/openbsc/mgcp.h @@ -224,6 +224,10 @@ struct mgcp_config { int osmux_batch_size; /* osmux port */ uint16_t osmux_port; + /* Pad circuit with dummy messages until we see the first voice + * message. + */ + uint16_t osmux_dummy; }; /* config management */ diff --git a/openbsc/src/libmgcp/mgcp_osmux.c b/openbsc/src/libmgcp/mgcp_osmux.c index 7f61173..90b7368 100644 --- a/openbsc/src/libmgcp/mgcp_osmux.c +++ b/openbsc/src/libmgcp/mgcp_osmux.c @@ -462,6 +462,12 @@ int osmux_enable_endpoint(struct mgcp_endpoint *endp, int role, LOGP(DMGCP, LOGL_ERROR, "Cannot allocate input osmux handle\n"); return -1; } + if (!osmux_xfrm_input_open_circuit(endp->osmux.in, endp->osmux.cid, + endp->cfg->osmux_dummy)) { + LOGP(DMGCP, LOGL_ERROR, "Cannot open osmux circuit %u\n", + endp->osmux.cid); + return -1; + } switch (endp->cfg->role) { case MGCP_BSC_NAT: @@ -480,6 +486,7 @@ void osmux_disable_endpoint(struct mgcp_endpoint *endp) { LOGP(DMGCP, LOGL_INFO, "Releasing endpoint %u using Osmux CID %u\n", ENDPOINT_NUMBER(endp), endp->osmux.cid); + osmux_xfrm_input_close_circuit(endp->osmux.in, endp->osmux.cid); endp->osmux.state = OSMUX_STATE_DISABLED; endp->osmux.cid = -1; osmux_handle_put(endp->osmux.in); diff --git a/openbsc/src/libmgcp/mgcp_vty.c b/openbsc/src/libmgcp/mgcp_vty.c index dd21a15..8f6b10a 100644 --- a/openbsc/src/libmgcp/mgcp_vty.c +++ b/openbsc/src/libmgcp/mgcp_vty.c @@ -144,6 +144,8 @@ static int config_write_mgcp(struct vty *vty) g_cfg->osmux_batch_size, VTY_NEWLINE); vty_out(vty, " osmux port %u%s", g_cfg->osmux_port, VTY_NEWLINE); + vty_out(vty, " osmux dummy %s%s", + g_cfg->osmux_dummy ? "on" : "off", VTY_NEWLINE); } return CMD_SUCCESS; } @@ -1245,6 +1247,19 @@ DEFUN(cfg_mgcp_osmux_port, return CMD_SUCCESS; } +DEFUN(cfg_mgcp_osmux_dummy, + cfg_mgcp_osmux_dummy_cmd, + "osmux dummy (on|off)", + OSMUX_STR "Enable dummy padding\n" "Disable dummy padding\n") +{ + if (strcmp(argv[0], "on") == 0) + g_cfg->osmux_dummy = 1; + else if (strcmp(argv[0], "off") == 0) + g_cfg->osmux_dummy = 0; + + return CMD_SUCCESS; +} + int mgcp_vty_init(void) { install_element_ve(&show_mgcp_cmd); @@ -1304,6 +1319,7 @@ int mgcp_vty_init(void) install_element(MGCP_NODE, &cfg_mgcp_osmux_batch_factor_cmd); install_element(MGCP_NODE, &cfg_mgcp_osmux_batch_size_cmd); install_element(MGCP_NODE, &cfg_mgcp_osmux_port_cmd); + install_element(MGCP_NODE, &cfg_mgcp_osmux_dummy_cmd); install_element(MGCP_NODE, &cfg_mgcp_allow_transcoding_cmd); install_element(MGCP_NODE, &cfg_mgcp_no_allow_transcoding_cmd); -- 1.7.10.4

9 years, 11 months

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