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Ivan Kluchnikov Ivan.Kluchnikov at fairwaves.ruHi Holger, Can you send full pcu tbf debug log for this attach procedure? I want to understand, in which place of TBF MS starts use new TLLI. What do you mean by "no content resolution on the UL"? As I know, there are content resolution on network side and on MS side. The contention resolution at one phase access is successfully completed on the MS side when the mobile station receives a PACKET UPLINK ACK/NACK. The contention resolution at two phase access is completed at MS when it receives the second uplink assignment message with its TLLI included. Also I can't understand why we should use IMSI in pcu? Why it is not enough to use TLLI? 2013/10/27 Holger Hans Peter Freyther <hfreyther at sysmocom.de>: > Hi, > > I got this log from the pcu while using my E71 (the only sub in this > network). > > <0007> gprs_rlcmac_meas.cpp:103 UL RSSI of TLLI=0x88661bc6: -67 dBm > <0002> bts.cpp:945 Got ACK, but UL TBF is gone TLLI=0xe512eba3 > <0007> gprs_rlcmac_meas.cpp:158 DL packet loss of IMSI=274080000004765 / TLLI=0xe512eba3: 0% > <0002> tbf.cpp:668 TBF TFI=0 TLLI=0x88661bc6 T3169 timeout during transsmission > <0002> tbf.cpp:690 - Assignment was on PACCH > <0002> tbf.cpp:694 - No uplink data received yet > > So there is an ACK for TLLI=0xe512eba3 but at the same time the tlli > 0x88661bc6 is timing out. > > PCU->SGSN TLLI=0x88661bc6 Attach Request > SGSN->PCU TLLI=0x88661bc6 Attach Accept (new P-TMSI) > PCU->SGSN TLLI=0xe512eba3 Attach Complete (new TLLI) (6s later) > > Now the question is how the PCU should behave. I think the MS is > allowed to change the TLLI (after a P-TMSI assignment) after the > contention resolution is completed. From my reading there is no content > resolution on the UL. My E71 appears to run into a timeout and then > issue a RACH request to send the Attach Complete. I think I have > seen other equipment failing to transmit the Attach Complete at > all. > > > I think for the SGSN -> PCU side we should generally look things up > by IMSI (there is already a warning in the code), for the MS->PCU > side. I think we should store the old and new TLLI (and then put > new_tlli into tlli once the new one is being used). > > comments? > holger > > > -- > - Holger Freyther <hfreyther at sysmocom.de> http://www.sysmocom.de/ > ======================================================================= > * sysmocom - systems for mobile communications GmbH > * Schivelbeiner Str. 5 > * 10439 Berlin, Germany > * Sitz / Registered office: Berlin, HRB 134158 B > * Geschaeftsfuehrer / Managing Directors: Holger Freyther, Harald Welte > > -- Regards, Ivan Kluchnikov. http://fairwaves.ru