New Comment: dear customer,
it's just channel quality became bad on DUT MT side, so call drop due to RLF.
\\ call handover to GSM ok
14:27:59.774 WCDMA RRC/High [ rrciho.c 7262] Rvd Handover From UTRAN Command GSM
....
\\ here GSM internal handover to cell 53, and got new channel assigned ok
14:29:18.183 GSM L1/High [ l1_ded_if.c 1470] gs1:MPH_HANDOVER_REQ to Cell 53 BSIC:22
14:29:18.382 GSM L2/High [ l2_sapi0.c 119] L2 state:SAPI0_LINK_ESTABLISHED
14:31:16.785 GSM GPRS GRR/Sys Info [ rr_gprs_debug.c 4332] gs1:IMsg: ASSIGNMENT_COMMAND state RR_DATA_TRANSFER
14:31:17.304 GSM L2/High [ l2_sapi0.c 119] L2 state:SAPI0_LINK_ESTABLISHED
Then channel SNR became low, so many SACCH CRC failed. finally RLF.
2018 Nov 29 14:31:43.053 [E0] 0x5A6C GSM DSDS L1 Burst Metrics
| FN | CHAN |ARFCN | RSSI | PWR (dBm)| DC[I] | DC[Q] | FREQ | TIME | SNR (dB)|GAIN_STATE|BAND_CLASS |
| 699516| SACCH| 65| 940185| -81.25| 74| 72| -200| -8| 4.01| 2| 8 (GSM 900)|
| 699542| SACCH| 72| 1298136| -79.81| -24| -35| 200| -8| 0.65| 2| 8 (GSM 900)|
| 699568| SACCH| 73| 223614| -87.44| 326| -10| 24| 0| 6.22| 2| 8 (GSM 900)|
| 699594| SACCH| 70| 7713773| -72.06| -533| 3068| 200| 8| -0.96| 2| 8 (GSM 900)|
2018 Nov 29 14:32:07.533 [70] 0x5A6C GSM DSDS L1 Burst Metrics
| FN | CHAN |ARFCN | RSSI | PWR (dBm)| DC[I] | DC[Q] | FREQ | TIME | SNR (dB)|GAIN_STATE|BAND_CLASS |
| 704820| SACCH| 72| 82034| -91.81| 29| 76| 36| 4| 1.01| 2| 8 (GSM 900)|
| 704846| SACCH| 73| 14148987| -69.44| 5485| -1955| -200| -8| -1.96| 2| 8 (GSM 900)|
| 704872| SACCH| 68| 17857897| -68.44| -1897| -3635| -134| 0| 0.47| 2| 8 (GSM 900)|
| 704898| SACCH| 68| 3314472| -75.75| -1781| 46| -200| 4| 1.97| 2| 8 (GSM 900)|
2018 Nov 29 14:32:21.933 [10] 0x5A6C GSM DSDS L1 Burst Metrics
| FN | CHAN |ARFCN | RSSI | PWR (dBm)| DC[I] | DC[Q] | FREQ | TIME | SNR (dB)|GAIN_STATE|BAND_CLASS |
| 707940| SACCH| 69| 144292| -89.31| -261| 30| -73| 4| 0.56| 2| 8 (GSM 900)|
| 707966| SACCH| 71| 1448496| -79.38| -41| 581| 200| 4| 0.44| 2| 8 (GSM 900)|
| 707992| SACCH| 65| 372749| -85.25| 5| 186| 2| 12| -1.03| 2| 8 (GSM 900)|
| 708018| SACCH| 66| 115046421| -60.38| -4011| -4716| 73| 16| 0.45| 2| 8 (GSM 900)|
14:31:42.573 GSM L2/High [ l2_send.c 301] SACCH CRC failure: L1 buffer reset, treat SRO as 0
14:31:43.053 GSM L2/High [ l2_send.c 301] SACCH CRC failure: L1 buffer reset, treat SRO as 0
14:32:15.693 GSM L1/Medium [ l1_tch.c 5703] gs1:SACCH CRC's error rate 17/30
14:32:30.093 GSM L1/Medium [ l1_tch.c 5703] gs1:SACCH CRC's error rate 29/30
14:32:30.093 GSM GPRS GRR/High [ rr_control.c 16759] gs1:Radio Link Failure
GSM的掉话的分析
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转载自blog.csdn.net/keyanting_2018/article/details/84797637
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