baseband-devel April 2012

baseband-devel@lists.osmocom.org

33 participants
42 discussions

The mobile app error
by Chengcheng Gou 13 Apr '12

13 Apr '12

hello I run the mobile app, but the error occur: What about the cause of the error,and how to solve it? Thanks！ LOSS counter for ACCH 31 Dropping frame with 86 bit errors Dropping frame with 84 bit errors Dropping frame with 79 bit errors LOSS counter for ACCH 30 Dropping frame with 82 bit errors Dropping frame with 82 bit errors Dropping frame with 89 bit errors LOSS counter for ACCH 29 Dropping frame with 86 bit errors Dropping frame with 76 bit errors Dropping frame with 70 bit errors LOSS counter for ACCH 28 Dropping frame with 88 bit errors Dropping frame with 79 bit errors Dropping frame with 70 bit errors LOSS counter for ACCH 27

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Looks connected but no cells avaible ?
by nicki240 10 Apr '12

10 Apr '12

Hi If I insert show cell 1 , it will show me no cells . show cell 1 : ARFCN |MCC |MNC |LAC |cell ID|forb.LA|prio |min-db |max-pwr|rx-lev -------+-------+-------+-------+-------+-------+-------+-------+-------+------- OsmocomBB# But It found a signal and I have an IMSI For more Information and help with the Call rejected Problem here : http://baseband-devel.722152.n3.nabble.com/Call-has-been-rejected-tt3896636… Thanks and Sorry for bad English -- View this message in context: http://baseband-devel.722152.n3.nabble.com/Looks-connected-but-no-cells-ava… Sent from the baseband-devel mailing list archive at Nabble.com.

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Encrypted GSM phone
by Marek Stopka 10 Apr '12

10 Apr '12

Hi, I have been just wondering... would it be possible to use your project as a base for DIY encrypted cellphone? My idea is that if I could get hold to output data after voice is encoded by GSM EFR codec, I might just easily encrypt this digital stream using AES128 and build trully encrypted cellphone. Where does actual "analog voice from microphone to digital data" conversion happends? In a layer1 that runs in a chip, or layer23 that runs on a PC? If it would be in layer23, encrypting a data stream with AES 128 whould be doable, am I missing something? Thanks Marek -- S pozdravem / Best regards Marek Stopka Kontakty / Contacts Mobil/Cell phone:+420 608 149 955 WEB: www.stopkaconsulting.eu

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Call has been rejected
by nicki240 09 Apr '12

09 Apr '12

hi If I try to call someboady , I'll get in the telnet connection this Error : OsmocomBB# call 1 0176********** OsmocomBB# % (MS 1) % Call has been rejected .mobile : <0009> mnccms.c:570 Make call to 0176********** <0009> mnccms.c:150 support TCH/H also <0009> mnccms.c:174 support full rate v2 <0009> mnccms.c:178 support full rate v1 <0009> mnccms.c:187 support half rate v1 <0006> transaction.c:76 ms 1 allocates transaction (proto 3 trans_id 255 callref 2 mem 0x8cfdd28) <0006> gsm48_cc.c:243 new state NULL -> MM_CONNECTION_PEND <0006> gsm48_cc.c:507 Sending MMCC_EST_REQ <0005> gsm48_mm.c:3774 (ms 1) Received 'MMCC_EST_REQ' event in state MM idle <0005> gsm48_mm.c:3777 -> substate PLMN search <0005> gsm48_mm.c:3779 -> callref 2, transaction_id 255 <0005> gsm48_mm.c:3042 Init MM Connection, not in normal state. <0006> gsm48_cc.c:2161 (ms 1) Received 'MMCC_REL_IND' in CC state MM_CONNECTION_PEND <0006> gsm48_cc.c:196 (ms 1 ti ff) Sending 'MNCC_REL_IND' to MNCC. <0006> gsm48_cc.c:243 new state MM_CONNECTION_PEND -> NULL <0006> transaction.c:104 ms 1 frees transaction (mem 0x8cfdd28) <0009> mnccms.c:372 Call has been released (cause 21) <0009> mnccms.c:71 (call 2) Call removed. osmocon : 8a 00 80 00 00 00 00 00 00 90 00 SIM Request (7): a0 a4 00 00 02 7f 10 SIM Response (2): 9f 1e SIM Request (5): a0 c0 00 00 1e SIM Response (32): 00 00 00 20 7f 10 02 00 f4 4f ff 01 11 bb 01 0f 05 00 83 8a 83 8a 00 80 00 00 00 00 00 00 90 00 SIM Request (7): a0 a4 00 00 02 6f 40 SIM Response (2): 9f 0f SIM Request (5): a0 c0 00 00 0f SIM Response (17): 00 00 00 7c 6f 40 04 00 11 ff 44 01 02 01 1f 90 00 SIM Request (5): a0 b2 01 04 1f SIM Response (33): 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 90 00 SIM Request (7): a0 a4 00 00 02 6f 42 SIM Response (2): 9f 0f SIM Request (5): a0 c0 00 00 0f SIM Response (17): 00 00 00 e1 6f 42 04 00 11 ff 44 01 02 01 2d 90 00 SIM Request (5): a0 b2 01 04 2d SIM Response (47): ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff f1 ff ff ff ff ff ff ff ff ff ff ff ff 07 91 94 71 07 16 00 00 ff ff ff ff 00 00 ff 90 00 Can somebody help me ? thx nicki240 -- View this message in context: http://baseband-devel.722152.n3.nabble.com/Call-has-been-rejected-tp3896636… Sent from the baseband-devel mailing list archive at Nabble.com.

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Layer1 reset type
by Chengcheng Gou 09 Apr '12

09 Apr '12

hello can anyone explain the different in the three reset types? L1CTL_RES_T_BOOT L1CTL_RES_T_FULL L1CTL_RES_T_SCHED thanks!

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900MHz packet radio?
by Kristen Eisenberg 08 Apr '12

08 Apr '12

I hear what you are saying, and we are working to support inter-BTS meshing for OpenBTS and OpenBSC. However, there is also value in getting the phones to mesh, if only because there are plenty situations where you might not be able to get a BTS, or be able to use any BTS that is around. Kristen Eisenberg Billige Flüge Marketing GmbH Emanuelstr. 3, 10317 Berlin Deutschland Telefon: +49 (33) 5310967 Email: utebachmeier at gmail.com Site: http://flug.airego.de - Billige Flüge vergleichen

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unmerged patches
by jolly 08 Apr '12

08 Apr '12

hi, i just collected all my patches together that i would have merged: 1. i added two patches to jolly/battery branch of osmocombb. it will add a font with symbols and display them at rssi. since i did not receive a reply about that from christian, i pushed it in this seperate branch so far. christian, if you find the time, just look at it. 2. there are several patches in my "testing" branch at jolly/ui of osmocombb. these patches are tested and work quite well. the are not related to the ui. i think they could me mergend: commit 66c21b3b7d30db205202d46893032ae2a73992a2 layer23: Send SIM APDUs via GSMTAP Usefull to trace SIM messages together with Um messages. commit b9ff5044a5fcbd07e6a295d75e14c7c504259914 layer23: Be sure to close mncc socket on exit of mobile instance commit e30e351d66f07e6effee768412a9d8f31202b4ed layer1: Retry fist power measurement, if it seems to fail In some cases (e.g. after a call with TCH) the first power measurement after a full reset will always return 0 (-110dbm). In this case the measurment is repeated once again. This is just a workarround, and it will not fix the actual cause. 3. there are several additions and fixes at jolly/rtpmux branch of openbsc. commit db3a7dd357bd7cd842a80655e734a1b4afdb6f7c and commit 872c6c002add0a741514aa505df9379a6fcdb955 allow to exchange traffic via rtp with a given rtp endpoint. the destination can be controlled via mncc interface. the result is that the traffic is not routed via mncc interface, but directly exchanged with the given rtp endpoint. lcr supports that, so traffic between sip and openbsc is directly forwarded and not routed through lcr and mncc interface. commit 3d407e7c8e5c4e01dc07a530f910d29fac687809 and commit f47d13e55888576c9201a3a7fee04fc58f98ff66 will handle bad frames from e1 bts. if a frame is bad, the rtp packet is dropped (if forwarded via rtp). if the bad frame is received by lcr via mncc interface, lcr will extrapolate the missing audio by repeating last valid frame with reduced value. instead of having a distrorted sound, the audio stream will now be clear, even if some frames are bad. commit 0193b8a76824cdce9d9da3f7374a928efac6f96c allows dynamic payload types when forwarding rtp traffic to a given rtp endpoint. (used for EFR/AMR/HR) commit ea724c6af9e1a5b6df8d0e5965f357896834d3ce and commit a22e598c0a93f88433c6a00bd2acdde5c2f496d5 will fix the problems with delay and loosing audio at nanobts. it uses system clock as a basis to correct timestamp and sequence number of frames transmitted to the bts. commit bf14b25358f7ceb021e2397e90c2fb9484245b7b fixes problem with interruption of traffic, if packet transmission via rtp fails in the beginning. the result of all these patches is a reliable audio stream. the call waiting works, as well as hold/retrieve of calls without audio interruption or increasing/high delay. (even if database access makes openbsc stop for some time.) in conjuction with lcr, a sip gateway can directly exchange audio traffic with openbsc. the codec to be used is negotiated between SIP gateway and MS. (depending on support and preference) 4. long time ago i extraced the sms protocols "smc" and "smr" (TS 11.11) from openbsc and added a state machines. they are now part of libosmocore and are used for sending/receiving sms via osmocombb. i removed all that code from openbsc and use libosmocore instead. see jolly/sms for the 4 patches. i hope that was not too much at a time :) regards, andreas

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the ccch number
by Chengcheng Gou 08 Apr '12

08 Apr '12

hello 1.if a cell has multiple TRX, and the CCCH number >1,then can the phone request channel on other timeslot but timeslot 0 in the uplink; how does a real phone deal with it? 2.how to mitigate the RACH DOS in the GSM network? anyone can help me?

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detecting TMSI and Bursts relation?
by Simian Denson 08 Apr '12

08 Apr '12

Hi, is it technically possible to sniff the air traffic (for example with ccch_scan from the osmocombb burst_ind branch) and correlate the relationship between a burst and a paging request (which contains the tmsi of the mobile) ? Basically: What are the steps to determine which tmsi (mobile) did which burst ? Thank you for your information! cheers, Simian

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how to identify the BTS belong to which BSC
by Chengcheng Gou 05 Apr '12

05 Apr '12

I want to know if there is a method for that, Thanks!

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baseband-devel April 2012