Bug #2611

PCU does not properly handle TA adjustment

Added by mqng2 over 3 years ago. Updated over 3 years ago.

Target version:
Start date:
Due date:
% Done:


Spec Reference:


MS can not establish TBF when it is moving away from BTS more than 2 km. This problem is causing by wrong TA adjustment requested by the PCU.

Below is the PCU traces to indicate that the PCU was wrongly set TA from 6 bits to 0 causing no TBF establishment for given MS.

<0001> ../../git/src/pcu_l1_if.cpp:360 RACH request received: sapi=1 qta=24, ra=119, fn=786612
<0007> ../../git/src/gprs_rlcmac_meas.cpp:186 DL Bandwitdh of IMSI=901555000002022 / TLLI=0xf6342bc3: 2 KBits/s
<0009> ../../git/src/gprs_bssgp_pcu.cpp:183 LLC [SGSN -> PCU] = TLLI: 0xc949121b IMSI: 901555000002021 len: 62
<0007> ../../git/src/gprs_rlcmac_meas.cpp:104 UL RSSI of TLLI=0xc949121b: -94 dBm
<0007> ../../git/src/gprs_rlcmac_meas.cpp:159 DL packet loss of IMSI=901555000002022 / TLLI=0xf6342bc3: 0%
<0002> ../../git/src/bts.cpp:1426 MS supports EGPRS multislot class 10.
<0001> ../../git/src/bts.cpp:1664 [PH-DATA] Updating TA 6 -> 0 on TRX = 0, TS = 7, FN = 786695
<0009> ../../git/src/tbf_ul.cpp:388 LLC [PCU -> SGSN] TBF len=62
<0009> ../../git/src/tbf_ul.cpp:388 LLC [PCU -> SGSN] TBF len=1510
<0009> ../../git/src/tbf_ul.cpp:388 LLC [PCU -> SGSN] TBF len=81


#1 Updated by msuraev over 3 years ago

  • Status changed from New to In Progress

Related gerrit 4678 is under review.

#2 Updated by laforge over 3 years ago

  • Status changed from In Progress to Closed
  • Assignee set to msuraev

How can this be in progress while not being assigned to anyone? Why is the gerrit patch merged months ago but this issue not updated?

Related patch has been merged on November 20, see

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