osmocom-net-gprs February 2016

osmocom-net-gprs@lists.osmocom.org

13 participants
16 discussions

PCU scheduling and PACCH timeout question

by Max

Hello. I'm trying to debug issue with current OsmoPCU master when some basebands ignore polling requests. The debug output from RLCMAC layer and corresponding .pcap files are attached to ticket http://projects.osmocom.org/issues/1524 The issue appears somewhere after line 112 in debug.log The corresponding packet in pcu.pcapng is 6866 After receiving PACKET_CONTROL_ACK from phone we're trying to schedule polling at FN 1137123 (see packet 6869 in pcap) and than at FN 1137127 (packet 6874) which subsequently fails. This seems suspiciously close but I have not found in the spec yet if this is legitimate thing to do. There are several other occurrences like that in both log and pcap. Have you experienced something like this? Do you have an idea why only some basebands are affected while others work fine? -- Max Suraev <msuraev(a)sysmocom.de> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschaeftsfuehrer / Managing Directors: Holger Freyther, Harald Welte

9 years, 3 months

RE: [PATCH] fix for encoding of padding bits

by Saurabh Sharan

Hello Harald, We had tried the option of sending one patch through git send-email. This was our first attempt so wanted to confirm whether we followed the process correctly. Please note that I am unable to see this patch(mail below) in Archive maintained at http://lists.osmocom.org/pipermail/osmocom-net-gprs/ Regards Saurabh -----Original Message----- From: Saurabh Sharan [mailto:saurabh.sharan@radisys.com] Sent: Tuesday, February 23, 2016 4:29 PM To: osmocom-net-gprs(a)lists.osmocom.org Cc: Saurabh Sharan <Saurabh.Sharan(a)radisys.com> Subject: [PATCH] fix for encoding of padding bits --- src/csn1.cpp | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/src/csn1.cpp b/src/csn1.cpp index 54cc411..9262c81 100644 --- a/src/csn1.cpp +++ b/src/csn1.cpp @@ -2400,7 +2400,12 @@ gint16 csnStreamEncoder(csnStream_t* ar, const CSN_DESCR* pDescr, bitvec *vector guint8 bits_to_handle = remaining_bits_len%8; if (bits_to_handle > 0) { - guint8 fl = filler&(0xff>>(8-bits_to_handle)); + /*section 11 of 44.060 + *The padding bits may be the 'null' string. Otherwise, the + *padding bits starts with bit '0', followed by 'spare padding'. + *< padding bits > ::= { null | 0 < spare padding > ! < Ignore : 1 bit** = < no string > > } ; + */ + guint8 fl = filler&(0xff>>(8-bits_to_handle + 1)); bitvec_write_field(vector, writeIndex, fl, bits_to_handle); LOGPC(DCSN1, LOGL_NOTICE, "%u|", fl); remaining_bits_len -= bits_to_handle; -- 1.7.9.5

9 years, 3 months

Support for Fast Ack/Nack Report in osmoPCU

by Saurabh Sharan

Hello All, We are currently working on providing the support of FANR in osmoPCU. We are in design phase and will share the design details soon. Please provide your valuable feedback on the design. Regards Saurabh

9 years, 3 months

Support of Basic EGPRS in OsmoPCU

by Saurabh Sharan

Hello All, We would like to provide the information that since Dec-2015 we have been working on adding the EGPRS support in OsmoPCU. We have provided the support for Basic EGPRS feature, details of which explained below. We would like to make the code available in Public domain so that we receive the feedback from all and upon approval would contribute to the master branch. Following are the features added: 1) EGPRS MCS 1 to MCS 9 coding scheme support 2) Radio Link Control Block Structure Updates 3) MCS Selection 4) Transmission and reception data flows for MCS1 to MCS9 5) EGPRS incremental redundancy (IR) mode, RLC function 6) EGPRS Window selection 7) RLC Re-segmentation and split block support 8) RLC retransmission based on coding families A, A', B and C We have taken interim rebase from the master during Jan-2016. Regards, Saurabh

9 years, 3 months

EDGE over osmo-pcu

by Jacob Erlbeck

Hi everybody, we have just done the first download of an Internet page using the current bleeding EDGE development version of the OSMO-PCU. Supported are MCS-1 to MCS-9 in downlink and MCS-1 to MCS-4 in uplink direction. The download of 'www.osmocom.org' has been documented in a PCAP file and can be downloaded from https://openbsc.osmocom.org/trac/wiki/osmo-pcu To decode the data blocks, an experimental patch for the gsmtab dissector is also available from there. Cheers Jacob -- - Jacob Erlbeck <jerlbeck(a)sysmocom.de> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschaeftsfuehrer / Managing Directors: Holger Freyther, Harald Welte

9 years, 4 months

[PATCH 0/3] Fix handling PDP update messages

by Daniel Willmann

From: Daniel Willmann <daniel(a)totalueberwachung.de> Hello, it seems PDP context updates was never really used/tested to an Update PDP context would not go through. The following patches fix that (at least for gtpv1). Regards Daniel Daniel Willmann (3): gtp: Pass pdp along when calling gtp_req() in gtp_update_context() gtp: Make gtp_update_pdp_conf() work for gtp0 and gtp1 connections gtp: Handle gtpv1 in gtp_update_pdp_conf() correctly gtp/gtp.c | 162 +++++++++++++++++++++++++++++++++++++++++++++----------------- 1 file changed, 118 insertions(+), 44 deletions(-) -- 2.1.4 -- - Daniel Willmann <dwillmann(a)sysmocom.de> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschaeftsfuehrer / Managing Directors: Holger Freyther, Harald Welte

9 years, 4 months

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osmocom-net-gprs February 2016