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taki

2009-06-01, 09:01 PM

Hi all, I'm facing a big problem, I have a big number of SDC C H drop per cell in my area which decrease C SSR (nokia product). Please advise electron

2009-06-01, 09:08 PM

C heck the hardware (i mean TRXs)!!! kais

2009-06-01, 11:34 PM

C heck the hardware (i mean TRXs)!!! change SD to ather TRX !!! gprastomo

2009-06-02, 12:01 AM

Hi all, I'm facing a big problem, I have a big number of SDC C H drop per cell in my area which decrease C SSR (nokia product). Please advise Hi, 1. Kindly check the alarms whether there is alarms on TRX, C ombiner, etc 2. C heck Interference, (C o/Adj BC C H or other freq), change the ARFC N to the clean one. 3. Finally, you can move the SDC C H C hannel to the other Trx which is clean br taki

2009-06-02, 12:10 AM

Thanks friends for your suggestions but I tried all thinks mentionned without success !!!! :confused: gprastomo

2009-06-02, 01:26 AM

Thanks friends for your suggestions but I tried all thinks mentionned without success !!!! :confused: Tell me the specific problem, you give general data taki

2009-06-02, 01:51 AM

Tell me the specific problem, you give general data Hi gprastomo, I'm facing a SDC C H drop problem for about 200 cells !!!! -I tried to change SD from trx to another one but no success -The frequency plan is good -No HW problem So what's the problem Please help armagedd0n

2009-06-02, 02:02 AM

maybe it is N7 link problem,can you see some counter about A (BSC -MSC ) interface? hassen

2009-06-02, 07:38 AM

Hi all, I'm facing a big problem, I have a big number of SDC C H drop per cell in my area which decrease C SSR (nokia product). Please advise hi taki i suspect transmission link ,and i advice you to ask for investigation A interface with protocole analyzer,maybe there is hardware problem in bsc level matrix responsible to make connection through transmission link between bsc and bts devices during immediate assignmente. have a look ! http://www.finetopix.com/showthread.php?t=1664 br hassen taki

2009-06-02, 09:51 AM

hi taki i suspect transmission link ,and i advice you to ask for investigation A interface with protocole analyzer,maybe there is hardware problem in bsc level matrix responsible to make connection through transmission link between bsc and bts devices during immediate assignmente. have a look ! http://www.finetopix.com/showthread.php?t=1664 br hassen Hi Hassen thanks a lot for your help, take care kahnoie

2009-06-13, 10:20 PM

Wrong t3212 timer value for few cells is lower than other cells would result in more periodic LU by MS results in high SDC C H load. SDC C H drops are linked to interference from other cells or due to large cell coverage (many subscribers at the cell border, with low RXLEV). Steps that can be taken to reduce SDC C H blocking are: 1. Increase T3212 from every 4 hours to every 6 or 8 hours.

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2. SDC C H HO should be disabled as it does not improve the QoS 3. Try to reduce TA filter from 64 (32km) to 15 (7.5km) for a few hours. 4. Try to increase RXLEV_AC C ESS_MIN from -104dBm to -98dBm for a few hours and observe the result. kais

2009-06-18, 03:17 AM

Hi gprastomo, I'm facing a SDC C H drop problem for about 200 cells !!!! -I tried to change SD from trx to another one but no success -The frequency plan is good -No HW problem So what's the problem Please help activate HO SD feature and chek for improvement. Khairul

2009-06-18, 03:21 AM

activate HO SD feature and chek for improvement. Brother.. Drill into the cause of the SDC C H drop.. is it RF or Non RF reason.. and plans your way from there.. most of the problem could be easily resolved by knowing what cause it.. if it planning, maintenance, traffic driven and only then.. you would resolved and optimized.. Best regards, krule adriansyah

2009-09-03, 02:33 AM

try to help: 1. 2. 3. 4. 5. 6.

C heck Timeslot status (Maybe faulty) C heck TRX C heck C ombiner C heck Site status (maybe equip / hw error) C heck Transmission link (maybe congestion in a interface) Try to tracing in OMC , and check mobile originating steps , which step it fault (which part , fail like : ran , core and etc)

ghassen

2009-09-03, 03:08 AM

Hi all, I'm facing a big problem, I have a big number of SDC C H drop per cell in my area which decrease C SSR (nokia product). Please advise try to increase the C RH it can work simmus0300

2009-09-03, 02:01 PM

try to help: 1. 2. 3. 4. 5. 6.

C heck Timeslot status (Maybe faulty) C heck TRX C heck C ombiner C heck Site status (maybe equip / hw error) C heck Transmission link (maybe congestion in a interface) Try to tracing in OMC , and check mobile originating steps , which step it fault (which part , fail like : ran , core and etc)

share the commands in nokia with parameters to checking above mentioned suggestions. simmus0300

2009-09-03, 02:02 PM

Hi, 1. Kindly check the alarms whether there is alarms on TRX, C ombiner, etc 2. C heck Interference, (C o/Adj BC C H or other freq), change the ARFC N to the clean one. 3. Finally, you can move the SDC C H C hannel to the other Trx which is clean br Pl share the commands in nokia with parameters to checking above mentioned suggestions. diankestiwi

2009-09-03, 02:51 PM

i think maybe u can change sdcch kanal to the best kanal at that slot ghassen

2009-09-03, 07:17 PM

Hi all, I'm facing a big problem, I have a big number of SDC C H drop per cell in my area which decrease C SSR (nokia product). Please advise also you can check some counters simmus0300

2009-09-04, 12:25 AM

also you can check some counters uote: Originally Posted by gprastomo View Post Hi, 1. Kindly check the alarms whether there is alarms on TRX, C ombiner, etc 2. C heck Interference, (C o/Adj BC C H or other freq), change the ARFC N to the clean one. 3. Finally, you can move the SDC C H C hannel to the other Trx which is clean br Pl share the commands in nokia with parameters to checking above mentioned suggestions. atese

2009-09-28, 03:05 AM

Hi Taki. Try to check this: 1. timing advance of cell in urban areas, if you have exssesive propagation try to fix it by downtilt, many times the SDC C H drop is originated by some co-channel co-bsic that meet in long distance. 2. C heck the rxLevAccesMin and try to set it no more than -102 dB, sometimes we force the mobiles to get the cell in poor RF conditions, around -110. This a SDC C H DC by lost of radiolink during signaling phase. kais

2009-09-28, 04:15 AM

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chek this case : SD DROP RADIO rate is HIGH then IF SD DURATION AVG > 6 PER TRX; --------> A TRX HARDWARE PROBLEM ( RESET AND/OR REPLAC E TRX) nabil el haddani

2009-09-28, 05:09 AM

Probable Reasons of Drops on SDC C H : Low Signal Strength on Down or Uplink The reason for poor coverage could be too few sites, wrong output power, shadowing, no indoor coverage or network equipment failure. Action: C heck coverage plots.C heck output power. Perform drive tests. C heck BTS error log Solution: Add new sites. Increase output power. Repair faulty equipment. Poor Quality on Down or Uplink Action: C heck C /I and C /A plots. C heck frequency plan. Perform drive tests. Solution: C hange frequency. Use available radio features. Too High Timing Advance Action: C heck if the cell parameter TALIM is < 63. C heck if the co-channel cells are over-heard. Solution: Set TALIM to a value close to 63. Tilt antenna/reduce antenna height/output power, etc. for co-channel cells. Mobile Error Some old mobiles may cause dropped calls if certain radio network features are used. Another reason is that the MS is damaged and not working properly. Action: .C heck MS fleet. Solution: Inform operator. Subscriber Behavior Poorly educated subscribers could use their handsets incorrectly by not raising antennas, choosing ill-advised locations to attempt calls, etc. Action: C heck customer complaints and their MS. Battery Flaw When a subscriber runs out of battery during a conversation, the call will be registered as dropped call due to low signal strength or others. Action: C heck if MS power regulation is used. C heck if DTX uplink is used. C ongestion on TC H The SDC C H is dropped when congestion on TC H. Action: C heck TC H congestion Solution: Increase capacity on TC H or using features like Assignment to another cell, C ell Load Sharing, HC S, Dynamic Half-Rate Allocation and FR-HR Mode Adaptation etc. capcipcup

2009-12-09, 03:41 PM

i think maybe u can change sdcch kanal to the best kanal at that slot how do we know which one is the best kanal ? diankestiwi

2010-01-05, 09:21 PM

how do we know which one is the best kanal ? as i know we can use batrana for siemens ( and we can calculate from the statistic data ) so we compare each kanal where are better than other. kadou26

2010-05-28, 01:25 AM

Please every body i want to know what mean this two sentence "SDC C H lost radio connections (error indication) " "SDC C H lost radio connections (connection failure)" in Huawei system (BSC ) and I to resolve it. it's the most important SDC C H drop reason in our network that affect seriously the C SSR Thanks capcipcup

2010-06-03, 04:31 PM

as i know we can use batrana for siemens ( and we can calculate from the statistic data ) so we compare each kanal where are better than other. would you tell me which statistic data should i get thanks kadou26

2010-06-03, 07:18 PM

Ok Thank to all mp9413

2010-06-05, 01:56 PM

Hi, Abis trace would be useful. Observe the messages flow and identify the abnormal release in SDC C H should give you some hints. mp OptimiNSN

2010-06-06, 03:39 AM

Dear I recommend that you sent us the report ND204 of the BSC or BTS, who have problems, so we can help you.

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