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Hello. Can somebody help me? Which are the reasons for SDCCH drop. When SDCCH drop of one cell rises, then what will be the reason? The number of Location updates is the same as it was. So obviously the cell has a problem.
Thank youvery interesting questions…Hey guys help here…
hi,
if it rises by itself, even though you didn’t change anything on the radio or configuration side, then:
– external interferer
– faulty hw in the bts (or bsc ?)
– faulty transmission on abis
– faulty MSthat’s all i can think of. do you have other suggestions?
regards
pixHmm,no i haven’t.I check for interference, but it is like previously.I will check Abis interfece, but i am sure that this is not the problem .So may be i will try to looking for interference attentively.
Thank you any wayPix, what kind of interference do you mean? Interference from other cells(e.g. adjacent cell with bad frequency)or interference from different HW.And please define ulty MS.
Thkstommy,
external interference = interference from other systems (other operators, or other RF systems such as radards, TV, Radio, etc)
In my assumptions, i assume that NOTHING have changed on the radio interface (same freq. as before, same parameters, for all surrounding cells). Therefore there cannot be a sudden increase of SD Drop due to a sudden interference from a neighbour cell. Indeed, the frequencies were not changed!
JE – Ok. What about hw problems in the BTS?
HW problems in the BTS are one possible solution of the problem…for now i can’t check this so fast…but really this is the thing that i will try to understand. The cell is in big city so external interference is option.
Hi,
in a couple of cells suddenly the sdcch traffic increased from around 7 erlang to around 36 erlang. Sdcch congestion increased to more than 40%, sdcch assignment is normal under 3%. Sdcch duration average (mean holding time) increased from around 3 seconds to around 16 seconds. What could go wrong? Other indicators related to TCH are fine. I suspected in software (SUM card), but, please, any idea that might resolve this issue!
Thanks in advance poeople,
Dell.Anyone any idea?
hi dell,
please try to reset the TRX and/or the BTS and/or the SUM. I forgot which one will fix the thing. I think it’s the TRX that needs to be reset.
Best Regards
pixHi Pix,
thanks. We did all those actions mentioned by you. Still nothing. We even deleted cells and recreated, the same thing. I’m not sure what kind of services are they where sdcch mean holding time is 16 seconds. Maybe it’s real something in the air. I don’t know.
Thanks again,
DellIf nothing find, I suggest use Abis protocol analyzer in that cell to investigate the case.
Pls I want to know:
1.the main causes of the SDCCH congestion rate
2.what KPIs are affected by SDCCH congestion and what are these effects.
3.what are the basic steps to optimize SDCCH congestionHi,
we made drive test in the area of a cell which has high sddch duration. We noticed that between LU request and LU accept there is a duration of around 17 seconds. And for LU request normally there was no need because all cells around were in the same LAC. During entering the cell in Idle mode the signal loses (No Service) after a while it began with “Channel request, LU request etc.). Bellow you can see the layer three messages, if you have any idea why it might be happen like that. Could be any equipment nearby which can cause that (a government facility is situated only 100 meters from that cell). If yes, what equipment?MsgTime Dir. Layer Message
11:59:13:477 D RR System Information Type 3
11:59:13:733 D RR System Information Type 4
11:59:13:970 D RR System Information Type 13
11:59:14:207 D RR System Information Type 2
11:59:14:473 D RR System Information Type 3
11:59:14:683 D RR System Information Type 4
11:59:14:930 D RR System Information Type 1
11:59:14:987 D RR Paging Request Type 1
11:59:15:037 D RR Paging Request Type 1
11:59:15:037 D RR Paging Request Type 3
11:59:15:067 D RR Paging Request Type 1
11:59:15:087 D RR Paging Request Type 1
11:59:15:100 U RR Channel Request
11:59:15:107 D RR Paging Request Type 1
11:59:15:127 D RR Paging Request Type 1
11:59:15:160 D RR System Information Type 2
11:59:15:207 D RR Immediate Assignment
11:59:15:423 U MM Location Updating Request
11:59:15:537 D RR System Information Type 5
11:59:15:573 U RR Measurement Report
11:59:15:660 U RR Classmark Change
11:59:15:863 D MM Authentication Request
11:59:16:017 D RR System Information Type 6
11:59:16:047 U RR Measurement Report
11:59:16:137 U MM Authentication Response
11:59:16:347 D RR Ciphering Mode Command
11:59:16:493 D RR System Information Type 5
11:59:16:507 U RR Measurement Report
11:59:16:610 U RR Ciphering Mode Complete
11:59:16:967 D RR System Information Type 6
11:59:17:003 U RR Measurement Report
11:59:17:440 D RR System Information Type 5
11:59:17:473 U RR Measurement Report
11:59:17:917 D RR System Information Type 6
11:59:17:950 U RR Measurement Report
11:59:18:393 D RR System Information Type 5
11:59:18:427 U RR Measurement Report
11:59:18:867 D RR System Information Type 6
11:59:18:903 U RR Measurement Report
11:59:19:347 D RR System Information Type 5
11:59:19:373 U RR Measurement Report
11:59:19:820 D RR System Information Type 6
11:59:19:857 U RR Measurement Report
11:59:20:297 D RR System Information Type 5
11:59:20:330 U RR Measurement Report
11:59:20:773 D RR System Information Type 6
11:59:20:807 U RR Measurement Report
11:59:21:247 D RR System Information Type 5
11:59:21:283 U RR Measurement Report
11:59:21:753 D RR System Information Type 6
11:59:21:783 U RR Measurement Report
11:59:22:210 D RR System Information Type 5
11:59:22:233 U RR Measurement Report
11:59:22:677 D RR System Information Type 6
11:59:22:710 U RR Measurement Report
11:59:23:150 D RR System Information Type 5
11:59:23:187 U RR Measurement Report
11:59:23:627 D RR System Information Type 5
11:59:23:660 U RR Measurement Report
11:59:24:107 D RR System Information Type 6
11:59:24:137 U RR Measurement Report
11:59:24:583 D RR System Information Type 5
11:59:24:613 U RR Measurement Report
11:59:25:057 D RR System Information Type 6
11:59:25:090 U RR Measurement Report
11:59:25:530 D RR System Information Type 5
11:59:25:567 U RR Measurement Report
11:59:26:007 D RR System Information Type 6
11:59:26:040 U RR Measurement Report
11:59:26:483 D RR System Information Type 5
11:59:26:517 U RR Measurement Report
11:59:26:957 D RR System Information Type 6
11:59:26:993 U RR Measurement Report
11:59:27:433 D RR System Information Type 5
11:59:27:467 U RR Measurement Report
11:59:27:910 D RR System Information Type 6
11:59:27:943 U RR Measurement Report
11:59:28:387 D RR System Information Type 5
11:59:28:420 U RR Measurement Report
11:59:28:860 D RR System Information Type 6
11:59:28:897 U RR Measurement Report
11:59:29:337 D RR System Information Type 5
11:59:29:373 U RR Measurement Report
11:59:29:813 D RR System Information Type 6
11:59:29:847 U RR Measurement Report
11:59:30:317 D RR System Information Type 5
11:59:30:327 U RR Measurement Report
11:59:30:767 D RR System Information Type 6
11:59:30:800 U RR Measurement Report
11:59:31:243 D RR System Information Type 5
11:59:31:277 U RR Measurement Report
11:59:31:717 D RR System Information Type 6
11:59:31:750 U RR Measurement Report
11:59:32:047 D MM Location Updating Accept
11:59:32:247 D RR System Information Type 5
11:59:32:250 U RR Measurement Report
11:59:32:317 U MM TMSI Reallocation Complete
11:59:32:533 D RR Channel Release
11:59:32:703 U RR Measurement Report
11:59:33:950 D RR Paging Request Type 1
11:59:34:143 D RR Paging Request Type 3
11:59:34:160 D RR Paging Request Type 1
11:59:34:193 D RR System Information Type 2
11:59:34:260 D RR Paging Request Type 1
11:59:34:287 D RR Paging Request Type 1
11:59:34:303 D RR Paging Request Type 1
11:59:34:323 D RR Paging Request Type 2
11:59:34:340 D RR Paging Request Type 1
11:59:34:353 D RR Paging Request Type 3
11:59:34:400 D RR Paging Request Type 1
11:59:34:420 U RR Channel Request
11:59:34:440 D RR System Information Type 3
11:59:34:497 D RR Paging Request Type 1
11:59:34:523 D RR Paging Request Type 3
11:59:34:550 D RR Paging Request Type 1
11:59:34:570 D RR Paging Request Type 3
11:59:34:590 D RR Paging Request Type 1
11:59:34:617 D RR Paging Request Type 1
11:59:34:637 D RR Paging Request Type 3
11:59:34:673 D RR System Information Type 4
11:59:34:690 D RR Immediate Assignment
11:59:34:933 U MM CM Service Request
11:59:35:047 D RR System Information Type 5
11:59:35:083 U RR Measurement Report
11:59:35:170 U RR Classmark Change
11:59:35:383 D RR Classmark Enquiry
11:59:35:523 D RR System Information Type 6
11:59:35:580 U RR Measurement Report
11:59:35:617 D RR Ciphering Mode Command
11:59:35:697 U RR Classmark Change
11:59:35:887 U RR Ciphering Mode Complete
11:59:36:013 D RR System Information Type 5
11:59:36:037 U RR Measurement Report
11:59:36:370 U CC Setup
11:59:36:477 D RR System Information Type 6
11:59:36:510 U RR Measurement Report
11:59:36:563 D CC Call Proceeding
11:59:36:803 D RR Assignment Command
11:59:36:997 U RR Assignment Complete
11:59:37:163 U RR Measurement Report
11:59:37:250 D CC Progress
11:59:37:480 D CC Alerting
11:59:37:540 D RR System Information Type 5
11:59:38:063 U RR Measurement Report
11:59:38:063 D CC Connect
11:59:38:063 U CC Connect Acknowledge
11:59:38:063 D RR System Information Type 6
11:59:38:170 U RR Measurement Report
11:59:38:520 D RR System Information Type 5
11:59:38:620 U RR Measurement Report
11:59:39:003 D RR System Information Type 6
11:59:39:103 U RR Measurement Report
11:59:39:490 D RR System Information Type 5
11:59:39:590 U RR Measurement Report
11:59:39:977 D RR System Information Type 6
11:59:40:073 U RR Measurement Report
11:59:40:460 D RR System Information Type 5
11:59:40:560 U RR Measurement Report
11:59:40:947 D RR System Information Type 6
11:59:41:043 U RR Measurement Report
11:59:41:430 D RR System Information Type 5
11:59:41:530 U RR Measurement Report
11:59:41:917 D RR System Information Type 6
11:59:42:017 U RR Measurement Report
11:59:42:407 D RR System Information Type 5
11:59:42:500 U RR Measurement Report
11:59:42:887 D RR System Information Type 6
11:59:42:987 U RR Measurement Report
11:59:43:370 D RR System Information Type 5
11:59:43:470 U RR Measurement Report
11:59:43:857 D RR System Information Type 6
11:59:43:957 U RR Measurement Report
11:59:44:067 D RR System Information Type 5
11:59:44:107 U RR Measurement Report
11:59:44:847 D RR System Information Type 6
11:59:44:877 U RR Measurement Report
11:59:45:307 D RR System Information Type 5
11:59:45:403 U RR Measurement Report
11:59:45:793 D RR System Information Type 6
11:59:45:890 U RR Measurement Report
11:59:46:277 D RR System Information Type 5
11:59:46:380 U RR Measurement Report
11:59:46:760 D RR System Information Type 6
11:59:46:860 U RR Measurement Report
11:59:47:233 D RR System Information Type 5
11:59:47:347 U RR Measurement Report
11:59:47:610 D RR Handover Command
11:59:47:887 U RR Handover Complete
11:59:48:013 U RR Measurement Report
11:59:48:400 D RR System Information Type 5
11:59:48:500 U RR Measurement Report
11:59:48:897 D RR System Information Type 6
11:59:48:983 U RR Measurement Report
11:59:49:370 D RR System Information Type 5
11:59:49:473 U RR Measurement Report
11:59:49:857 D RR System Information Type 6
11:59:49:957 U RR Measurement Report
11:59:50:340 D RR System Information Type 5
11:59:50:440 U RR Measurement Report
11:59:50:827 D RR System Information Type 6
11:59:50:923 U RR Measurement Report
11:59:51:310 D RR System Information Type 5
11:59:51:410 U RR Measurement Report
11:59:51:797 D RR System Information Type 6
11:59:51:897 U RR Measurement Report
11:59:52:297 D RR System Information Type 5
11:59:52:380 U RR Measurement Report
11:59:52:767 D RR System Information Type 6
11:59:52:867 U RR Measurement Report
11:59:53:250 D RR System Information Type 5
11:59:53:350 U RR Measurement Report
11:59:53:737 D RR System Information Type 6
11:59:53:837 U RR Measurement Report
11:59:54:220 D RR System Information Type 5
11:59:54:320 U RR Measurement Report
11:59:54:707 D RR System Information Type 6
11:59:54:807 U RR Measurement Report
11:59:55:193 D RR System Information Type 5
11:59:55:333 U RR Measurement Report
11:59:55:677 D RR System Information Type 6
11:59:55:777 U RR Measurement Report
11:59:56:160 D RR System Information Type 5
11:59:56:260 U RR Measurement Report
11:59:56:657 D RR System Information Type 6
11:59:56:747 U RR Measurement Report
11:59:57:160 D RR System Information Type 5
11:59:57:207 U RR Measurement Report
11:59:57:547 D RR System Information Type 6
11:59:57:703 U RR Measurement Report
11:59:58:103 D RR System Information Type 5
11:59:58:203 U RR Measurement Report
11:59:58:590 D RR System Information Type 6
11:59:58:687 U RR Measurement Report
11:59:59:073 D RR System Information Type 5
11:59:59:173 U RR Measurement Report
11:59:59:557 D RR System Information Type 6
11:59:59:657 U RR Measurement Report
12:00:00:043 D RR System Information Type 5
12:00:00:143 U RR Measurement Report
12:00:00:530 D RR System Information Type 6
12:00:00:627 U RR Measurement Report
12:00:01:013 D RR System Information Type 5
12:00:01:113 U RR Measurement Report
12:00:01:500 D RR System Information Type 6
12:00:01:600 U RR Measurement Report
12:00:01:983 D RR System Information Type 5
12:00:02:083 U RR Measurement Report
12:00:02:477 D RR System Information Type 6
12:00:02:570 U RR Measurement Report
12:00:02:957 D RR System Information Type 5
12:00:03:057 U RR Measurement Report
12:00:03:440 D RR System Information Type 6
12:00:03:540 U RR Measurement Report
12:00:03:927 D RR System Information Type 5
12:00:04:023 U RR Measurement Report
12:00:04:413 D RR System Information Type 6
12:00:04:510 U RR Measurement Report
12:00:04:897 D RR System Information Type 5
12:00:04:997 U RR Measurement Report
12:00:05:380 D RR System Information Type 6
12:00:05:480 U RR Measurement Report
12:00:05:867 D RR System Information Type 5
12:00:05:970 U RR Measurement Report
12:00:06:350 D RR System Information Type 6
12:00:06:450 U RR Measurement Report
12:00:06:837 D RR System Information Type 5
12:00:06:937 U RR Measurement Report
12:00:07:323 D RR System Information Type 6
12:00:07:420 U RR Measurement Report
12:00:07:807 D RR System Information Type 5
12:00:07:907 U RR Measurement Report
12:00:08:290 D RR System Information Type 6
12:00:08:330 U RR Measurement Report
12:00:08:780 D RR System Information Type 5
12:00:08:877 U RR Measurement Report
12:00:09:263 D RR System Information Type 6
12:00:09:360 U RR Measurement Report
12:00:09:750 D RR System Information Type 5
12:00:09:847 U RR Measurement Report
12:00:10:233 D RR System Information Type 6
12:00:10:340 U RR Measurement Report
12:00:10:717 D RR System Information Type 5
12:00:10:817 U RR Measurement Report
12:00:11:203 D RR System Information Type 6
12:00:11:303 U RR Measurement Report
12:00:11:687 D RR System Information Type 5
12:00:11:787 U RR Measurement Report
12:00:12:177 D RR System Information Type 6
12:00:12:270 U RR Measurement Report
12:00:12:657 D RR System Information Type 5
12:00:12:757 U RR Measurement Report
12:00:13:153 D RR System Information Type 6
12:00:13:177 U RR Measurement Report
12:00:13:627 D RR System Information Type 5
12:00:13:727 U RR Measurement Report
12:00:14:113 D RR System Information Type 6
12:00:14:213 U RR Measurement Report
12:00:14:603 D RR System Information Type 5
12:00:14:697 U RR Measurement Report
12:00:15:083 D RR System Information Type 6
12:00:15:183 U RR Measurement Report
12:00:15:580 D RR System Information Type 5
12:00:15:667 U RR Measurement Report
12:00:16:057 D RR System Information Type 6
12:00:16:153 U RR Measurement Report
12:00:16:540 D RR System Information Type 5
12:00:16:643 U RR Measurement Report
12:00:17:023 D RR System Information Type 6
12:00:17:123 U RR Measurement Report
12:00:17:510 D RR System Information Type 5
12:00:17:607 U RR Measurement Report
12:00:17:993 D RR System Information Type 6
12:00:18:103 U RR Measurement Report
12:00:18:480 D RR System Information Type 5
12:00:18:580 U RR Measurement Report
12:00:18:970 D RR System Information Type 6
12:00:19:067 U RR Measurement Report
12:00:19:450 D RR System Information Type 5
12:00:19:550 U RR Measurement Report
12:00:19:937 D RR System Information Type 6
12:00:20:037 U RR Measurement Report
12:00:20:423 D RR System Information Type 5
12:00:20:520 U RR Measurement Report
12:00:20:910 D RR System Information Type 6
12:00:21:007 U RR Measurement Report
12:00:21:390 D RR System Information Type 5
12:00:21:490 U RR Measurement Report
12:00:21:877 D RR System Information Type 6
12:00:21:977 U RR Measurement Report
12:00:22:360 D RR System Information Type 5
12:00:22:463 U RR Measurement Report
12:00:22:847 D RR System Information Type 6
12:00:22:960 U RR Measurement Report
12:00:23:330 D RR System Information Type 5
12:00:23:430 U RR Measurement Report
12:00:23:817 D RR System Information Type 6
12:00:23:850 U RR Measurement Report
12:00:24:303 D RR System Information Type 5
12:00:24:403 U RR Measurement Report
12:00:24:787 D RR System Information Type 6
12:00:24:887 U RR Measurement Report
12:00:25:247 D RR Handover Command
12:00:25:273 D RR System Information Type 5
12:00:25:457 D RR Physical Information
12:00:25:517 D RR Physical Information
12:00:25:577 U RR Handover Complete
12:00:25:597 D RR Physical Information
12:00:25:723 U RR Measurement Report
12:00:26:103 D RR System Information Type 5
12:00:26:207 U RR Measurement Report
12:00:26:600 D RR System Information Type 6
12:00:26:690 U RR Measurement Report
12:00:27:077 D RR System Information Type 5
12:00:27:177 U RR Measurement Report
12:00:27:560 D RR System Information Type 6
12:00:27:660 U RR Measurement Report
12:00:28:047 D RR System Information Type 5
12:00:28:147 U RR Measurement Report
12:00:28:523 D RR System Information Type 6
12:00:28:630 U RR Measurement Report
12:00:29:017 D RR System Information Type 5
12:00:29:117 U RR Measurement Report
12:00:29:500 D RR System Information Type 6
12:00:29:600 U RR Measurement Report
12:00:29:987 D RR System Information Type 5
12:00:30:087 U RR Measurement Report
12:00:30:473 D RR System Information Type 6
12:00:30:570 U RR Measurement Report
12:00:30:970 D RR System Information Type 5
12:00:31:057 U RR Measurement Report
12:00:31:443 D RR System Information Type 6
12:00:31:547 U RR Measurement Report
12:00:31:927 D RR System Information Type 5
12:00:32:027 U RR Measurement Report
12:00:32:387 D RR System Information Type 6
12:00:32:513 U RR Measurement Report
12:00:32:750 D RR System Information Type 5
12:00:32:997 U RR Measurement Report
12:00:33:180 D RR System Information Type 6
12:00:33:393 U RR Measurement Report
12:00:33:863 D RR System Information Type 5
12:00:33:963 U RR Measurement Report
12:00:34:350 D RR System Information Type 6
12:00:34:450 U RR Measurement Report
12:00:34:837 D RR System Information Type 5
12:00:34:933 U RR Measurement Report
12:00:35:320 D RR System Information Type 6
12:00:35:420 U RR Measurement Report
12:00:35:807 D RR System Information Type 5
12:00:35:907 U RR Measurement Report
12:00:36:290 D RR System Information Type 6
12:00:36:390 U RR Measurement Report
12:00:36:777 D RR System Information Type 5
12:00:36:873 U RR Measurement Report
12:00:37:260 D RR System Information Type 6
12:00:37:360 U RR Measurement Report
12:00:37:747 D RR System Information Type 5
12:00:37:847 U RR Measurement Report
12:00:38:107 D RR Handover Command
12:00:38:267 D RR Physical Information
12:00:38:290 U RR Measurement Report
12:00:38:347 D RR Physical Information
12:00:38:423 U RR Handover Complete
12:00:38:687 U CC Disconnect
12:00:38:687 D RR System Information Type 5
12:00:38:793 U RR Measurement Report
12:00:38:847 D CC Release
12:00:38:873 U CC Release Complete
12:00:39:087 D RR Channel Release
12:00:39:227 D RR System Information Type 5
12:00:39:277 U RR Measurement Report
12:00:39:437 D RR Paging Request Type 1
12:00:39:467 D RR Paging Request Type 1
12:00:39:487 D RR Paging Request Type 1
12:00:39:517 D RR Paging Request Type 1
12:00:39:533 D RR Paging Request Type 2
12:00:39:560 D RR Paging Request Type 1
12:00:39:580 D RR Paging Request Type 1
12:00:39:627 D RR System Information Type 13
12:00:39:677 D RR Paging Request Type 1
12:00:39:707 D RR Paging Request Type 3
12:00:39:723 D RR Paging Request Type 2
12:00:39:753 D RR Paging Request Type 1
12:00:39:777 D RR Paging Request Type 1
12:00:39:797 D RR Paging Request Type 1
12:00:39:817 D RR Paging Request Type 1
12:00:39:853 D RR System Information Type 2
12:00:39:917 D RR Paging Request Type 1
12:00:39:943 D RR Paging Request Type 1
12:00:39:963 D RR Paging Request Type 1
12:00:39:990 D RR Paging Request Type 1
12:00:40:007 D RR Paging Request Type 2
12:00:40:037 D RR Paging Request Type 1
12:00:40:057 D RR Paging Request Type 2
12:00:40:087 D RR System Information Type 3
12:00:40:153 D RR Paging Request Type 1
12:00:40:180 D RR Paging Request Type 1
12:00:40:200 D RR Paging Request Type 1
12:00:40:227 D RR Paging Request Type 1
12:00:40:247 D RR Paging Request Type 3
12:00:40:273 D RR Paging Request Type 1
12:00:40:293 D RR Paging Request Type 1
12:00:40:323 D RR System Information Type 4
12:00:40:390 D RR Paging Request Type 1
12:00:40:420 D RR Paging Request Type 2
12:00:40:437 D RR Paging Request Type 1
12:00:40:467 D RR Paging Request Type 1
12:00:40:483 D RR Paging Request Type 1
12:00:40:513 D RR Paging Request Type 1
12:00:40:533 D RR Paging Request Type 1
12:00:40:567 D RR System Information Type 1
12:00:41:710 D RR Paging Request Type 1
12:00:42:347 D RR System Information Type 3
12:00:42:943 D RR System Information Type 3
12:00:43:027 D RR System Information Type 3
12:00:43:900 D RR System Information Type 3
12:00:43:970 D RR System Information Type 4
12:00:44:623 D RR System Information Type 4
12:00:45:217 D RR System Information Type 3
12:00:46:927 D RR System Information Type 3
12:00:51:223 D RR Paging Request Type 1
12:00:53:603 D RR Paging Request Type 1Regards,
DellAnd according to indicators there is an increase of IMSI Detach rate from 2 percent to 13 percent.
