RBS configuration and Faults Rectification

-Site Configuration Overview-Fault management of RBS-Taking BTS health checkup-Queries Session

Site Configuration OverviewUnderstanding the CDDUpdate in OSSIntegration and DIP provided from fieldLogical configuration and New Site loading.Remove Call bar and Site activationTaking Site health check up

Basic components of GSM system.

GSM system is divided into Two parts.BSSSS

BSS Includes your BTS and BSC ,where as SS includes your MSC/VLR,GMSC,HLR.

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BTS Logical Model: BTS Logical Model describes a logical representation of the BTS as viewed from the BSC for the purposes of O&M communication. The model comprises a structured hierarchy of instances of Managed Object (MO) of a given Managed Object Class.

Managed Object:

The class of all objects within the BTS Logical Model with which the BSC can communicate. A Managed Object (MO) is a logical representation of hardware units and software at the BTS site. Note that hardware can be shared between Managed Objects of different classes. The Transceiver Group is a special case as it does not have any hardware or software of its own. Instead, it consists of a set of Managed Objects from other managed object classes.

Logical Managed Object (MO)

TGTransceiver GroupTXTSCONRXTFTRXDPBSC/TRCMSCTXTSRXTRXTXTSRXTRXISCFTransceiver Group (TG), Central Functions (CF), Transceiver Controller (TRXC), Interface Switch (IS), LAPD Concentrator (CON), Timing Function (TF), Digital Path (DP), Transmitter (TX), Receiver (RX) and Timeslot (TS). BTS Logical Model G01 comprises one or more instances of MO of class: TG, TF, TRXC, TX, RX and TS.

BTS Logical Model:

BTS Logical Model describes a logical representation of the BTS as viewed from the BSC for the purposes of O&M communication. The model comprises a structured hierarchy of instances of Managed Object (MO) of a given Managed Object Class. BTS Logical Model G12 comprises one or more instances of MO of class: Transceiver Group (TG), Central Functions (CF), Transceiver Controller (TRXC), Interface Switch (IS), LAPD Concentrator (CON), Timing Function (TF), Digital Path (DP), Transmitter (TX), Receiver (RX) and Timeslot (TS). BTS Logical Model G01 comprises one or more instances of MO of class: TG, TF, TRXC, TX, RX and TS.

Cell Design Data steps:The parameters provided by RF Planning->Find the Undefined TG RXMOP:MO=RXOTG-1&&-511;->Find unused CBCH Code for the Cell RXMBP:ID=ALL,NOTEXT;->Defined the Cell and parameter using DT to the BSC

->Defined the Neighbor Of the CellRLNRP:CELL=ZUNBT1,CELLR=ALL,NODATA;

->Defined Site Details in MSC :(connect MSC )

MGCEP:CELL=KHUDE13;MGCEI:CELL=ZUNBT13,CGI= 404-16-26-26263,BSC=NEBDIM1;

Update In OSS by Adjustment Procedure

New Site Loading:rxtcp:moty=rxotg,cell=jonai01;rxcdp:mo=rxotg-59;dtstp:dip=jonai01;dtdip:dip=jonai01;ntcop:snt=etm2-0;exdai:dev=RBLT2-576&&-607;blode:dev=RBLT2-576&&-607;rxapi:mo=rxotg-59,dcp=1&&31,dev=RBLT2-577&&-607;rxesi:mo=rxotg-59,subord;rxble:mo=rxotg-59,subord;rxesi:mo=rxocf-59;rxble:mo=rxocf-59;rxmsp:mo=rxocf-59;

Active/Halt the Cell siteRLSBP:CELL=PIS0023;RLNRP:CELL=PIS0023,CELLR=ALL,NODATA;RLSTC:CELL=PIS0023,STATE=ACTIVE;

RLSTC:CELL=PIS0023,STATE=HALTED;

RBS FAULTS RectificationUnderstand Various faultsHow to follow the OPIApply the proper resolutionCoordinate with field Engineer

BTS Interfaces

Various device Defined

RBS faultsLOOP TEST FAILED, TS SYNC FAULTPERMANENT FAULTABIS PATH UNAVAILABLE BTS INT AFFECTED(FC+TT)

RBS faultsCF Loading failed (Site/cell is not coming up)TRX is/are not coming upRXOIS not coming upRXOTF not coming up/Not config.Site showing in Local ModeSite is down

General Commands Used for Faults Rectification1)To view External Alarm of particular site:-Allip:acl =a1;Allip:acl =a2;Allip:acl =a3;2) To find out the TG Mo for particular site:-Run RXTCP:MOTY=RXOTG,CELL=3) To check Internal Alarm at site:-RXASP:MO=RXOTG-< TG NO>;Run RXMFP:MO=RXOCF-;It will give printout having Fault codes as :-2A:8-VSWR2A:33-RX DIVERSITY2A:41-LOST COMM. TO TRU2A:42-LOST COMM. TO CDU2B:10-SITE ON BATTERY2B:4 - TX SATURATION

What is Power Fail alarm? Mains supply fail is called power fail.In Delhi at many sites 3phase power supply is available and so many sites running on 1phase power supply.What happens when Power Fail occurs in a site? When power fail occurs then site (BTS) at first goes into battery then after a short while DG set on.A BTS (or RBS in Ericsson terminology) is running on +24 volts power supply.Actually here battery placed as battery bank ( i.e combination of many batteries). Battery bank voltage is about 23.5volts.Generally there are two battery banks are placed in the shelter.Total battery bank capacity is 800amph ( each have a capacity of 400amph).Depends on the condition of batteries this combined battery can serve supply to BTS for maximum 4hours.How a site can get its power and what are the power related faults? The detailed procedure is given below: The mains power supply at first enters into the PSU (Power Supply Unit).The RBS2000 series is based on standardized hardware units called Replaceable Unit (RU). The major RU are: (1) Power Supply Unit (PSU) or Power Interface Unit (PIU), (2) Combining and Distribution Unit (CDU),

Alarms:

4) To check no. of sites down in Particular BSC:- Run RLCRP:CELL=ALL;Check if BCCH=0,site is down

5) To check the running configuration of a site:-Run RLSLP:CELL=;Check for NCH where BCCH,SDCCH & TCH values are displayed.Run RXCDP:MO=RXOTG-;Check for the MOs which are in CONFIG & UNUSED,SELECT mode.This command also tells the frequencies alloted TRX wise.

6) To check the state of a cell:-Run RLSTP:CELL=;It will shown wheather site is in active or halted state

7) To check the software of BTS:-Run RXMOP:MO=RXOTG-;Check SWVERACT

General Commands Used for Faults Rectification

8) To check the BTS type:-Run RXMFP:MO=RXOCF-;Check for RULOGICALID type ,for 2206,2106,2204 it is mentioned in that parameter.

9) To check the DIP (digital Interface path) status:Run DTSTP:DIP=;It will print the status of dip as WO,ABL,LOS etc

10) To check the devices atttched to the TG:-Run RXAPP:MO=RXOTG-;

11) To check the status of TG,CF,TRX:-RXMSP:MO=RXOTG-; same for CFRXMSP:MO=rxotrx--,subord;

General Commands Used for Faults Rectification

General Commands Used for Faults RectificationTo change the Port A to CBlock and Out of service of TGrxape: mo=rxotg-36,dcp=all; RXAPI:MO=RXOTG-36,DCP=1&&31,DEV=RBLT2-4961&&-4991;(Port A)RXAPI:MO=RXOTG-36,DCP=287&&317,DEV=RBLT2-4961&&-4991; (Port C)

To change the DIPRXAPP:MO=RXOTG-36; (DCP=1&&31,DEV=RBLT2-4961&&-4991)rxape: mo=rxotg-36,dcp=all;(Block/De-block the Dev Keep 0 no DCP MBL, Reset the DIP and then Attached)RXAPI:MO=RXOTG-36,DCP=1&&31,DEV=RBLT2-1537&&-1567;

General Commands Used for Faults RectificationGive the loading to CF

RXBLI:MO=RXOTG-,SUBORD,FORCE;RXESE:MO=RXOTG-,SUBORD;RXESI:MO=RXOTG-,SUBORD;RXBLE:MO=RXOTG-,SUBORD;

When a Site is down:-DO RCA Find TG no.Check rxmsp if CF is in noop state.Check the status of dipFind dip connected to TG :-RXMDP:MO=RXOCF-;(check device connected to CF)RXAPP:MO=RXOTG-;(Check the Dev connected to TG)RADEP:DEV=RBLT2-;(check the SNT of device)NTCOP:SNT=ETM2-3;(check the dip name verifying that device in that SNT)DTSTP:DIP=;If dip is break escalate to FM engineer.If Dip is working check the external alarm at siteIf no alarm is there and CF is still in noop state, Try to reload the CF

How to remove Abis path unavailable

Find the missing RBLT2 devices byRxmdp:moty=rxots,dev=rblt2-3406;

rxmdp:moty=rxots,dev=rblt2-3406;RADIO X-CEIVER ADMINISTRATIONMANAGED OBJECT DEVICE INFORMATION

MO DEVS DEVT SDEVRXOTS-88-9-3 RBLT2-3406 0010RXOTS-88-9-4 RBLT2-3406 0001

Find rxapp for TG 88.RXAPP:MO=RXOTG-88;RXOTG-88

DEV DCP APUSAGE APSTATE 64K TEIRBLT2-3393 1 MPLEX16 SPEECH/DATA NO MPLEX16 SPEECH/DATA NO MPLEX16 SPEECH/DATA NO MPLEX16 SPEECH/DATA NORBLT2-3406 14 MPLEX16 SPEECH/DATA NO MPLEX16 SPEECH/DATA NO MPLEX32 IDLE NORBLT2-3407 15 UNDEF IDLE NORBLT2-3408 16 UNDEF IDLE NO

How to remove Abis path unavailable

Remove the undef idle devices from Tg and attach it to TG 222Rxape:mo=rxotg-88,dcp=15&16;Rxapi:mo=rxotg-222,dcp=15&16,dev=rblt2-3407&-3408;Check again rxasp:mo=rxotg-222;

TS SYNC FAULTWHY..??Synchronization has been lost on the uplink or downlink Transcoder and Rate Adaptation Unit (TRAU) channels.

How to resolve the Problem..Check Abis path DCP mapping.Devices should be defined on correct DCPs w.r.t the Port A,B,C or D at RBS side.If 2-DIPs are given & 1-DIP needs to be cascaded between two cabinets, then always define both DIPs to Master cabinet & then cascade one of them with another cabinet.In case of MBC site there should not be mismatch in devices and DCPs i.e., fault will occur if 900 Mhz band devices attach on 1800 Mhz band devices.

Commands used to resolve TS SYNC fault..RXAPP:MO=RXOTG-;// Check ABIS print & find wrong deviceRXMDP:MO=RXOTS---;// Find wrong Device associated with TSRXBLI:MO=RXOTS---;// Block the TSRXESE:MO=RXOTS---;// Out of Service TSRXAPE:MO=RXOTG-,DCP=;// Remove the deviceRXAPP:MO=RXOTG-;// Check ABIS printRXASP:MO=RXOTG-;// Check Alarm Status

LOOP TEST FAILEDWHY..??An automatic loop test of the traffic carrying capabilities has failed.

Commands used to resolve LOOP TEST FAILED..RXBLI:MO=RXOTS---;// Block TSRXLTI:MO=RXOTS---;// Loop Test on TSRXBLE:MO=RXOTS---;// Deblock TS

PERMANENT FAULTWHY..??A MO is classified as being permanently faulty when fault situations have occurred, and have been cleared, a certain number of times within a certain period of time. Manual intervention is required to bring such equipment back into operation.

How to resolve the Problem..Give soft reset (Block/Deblock)Give hard resetIf alarm not disappear, Change the Hardware (H/W Faulty)

Commands used to resolve PERMANENT FAULT..RXBLI:MO=RXOTRX--,SUBORD,FORCE;// Block MORXESE:MO=RXOTRX--,SUBORD;// Out of Service MORXESI:MO=RXOTRX--,SUBORD;// In Service MORXBLE:MO=RXOTRX--,SUBORD;// Deblock MORXASP:MO=RXOTG-;// Check alarm againRXMFP:MO=RXOTRX--;// Check Fault codeRXMSP:MO=RXOTG-,SUBORD;// Check MO state

LOCAL MODEWHY..??The MO is in Local Mode or the MO has subsequently changed from Local to Remote Mode and a fault exists in the communication link between the BSC and the BTS.

How to resolve the Problem.. Escalate to field engineer & get local mode changed to remote mode.Hard Reset at BTS site & Reload IDB & then Soft Reset.If from NOC end TRU is showing in local mode and Field engg. says at his end TRU is blinking (already in remote mode), then check..RXMSP:MO=RXOCON-; RXMSP:MO=RXOIS-; Check DCP1 & DCP2 defined on TRUs are correct using command RXMOP:MO=RXOTRX--;

If every parameter is properly defined then escalate to field engineer to recheck TRUs/DXU & related connection & load IDB again.

Change the Hardware

TF not SynchronizedWHY..??DIP not working or bad qualityDXU E1 Port FaultyDXU Faulty

How to Resolve the Problem..Give soft & hard reset to DXU or CFRXBLI, RXESE, RXESI, RXBLE

Check DIP status & DIP QualityDTSTP:DIP=;DTQUP:DIP=;

Reset DIP if error on DIP & Give soft ResetDTQSR:DIP=,ES,SES,SF;DTQSR:DIP=,DEGR,UNACC;

Ask FM engg. to check E1 port & connector at DXU & Reload IDB

If problem does not resolve change the E1 port A to Port B or C or D & Reload IDB

Lastly change DXU.

Managed Objects States

Replacement of Faulty DRU

DRU may gets faulty by TX saturation alarm, RF loop test fault, TX/RX min gain max gain violated, TX max power restricted, If dTRU has any hardware faulty then RED LED will start to glow. Following steps must be taken while replacing dTRU. Identify the faulty DRU by reading IDB Radio or Maintenanc MO faults.Loose all the screws of the DRU.Put DRU in local mode.Disconnect TX/RX cables from it.Power off DRU.Replace the faulty DRU by new one.Insert back DRU in its slot and connect all the cables back their position.Power up the DRU. Put DRU in remote mode.

Replacement of Faulty DXU-31

DXU-31 or its flash card may become faulty. BSC will no longer communicate with DXU. BSC will get DIP ABL and OML Fault. No external alarms will communicate to BSC. If DXU gets faulty RED LED on it will start to glow. Following steps must be taken while replacing DXU or flash card. Ensure whether OMT can be connected to DXU or not. IDB can be read or not.Loose all the screws of the DXU.Put DXU in local mode.Disconnect ESB cable, Y link cables and Port (A, B, C, D) cables from it.Power off DXU.Replace the faulty DXU by new one.Insert the flash card according to its orientation.Insert back DXU in its slot and connect all the cables back their position.Power up the DXU.

BST Health checkupRXTCP:MOTY=RXOTG,CELL=cell id;RXCDP:MO=RXOTG-tg no;RXASP:MO=RXOTG-tg no;RXMSP:MO=RXOTG-tg no,SUBORD;RXMFP:MO=RXOTG-tg no;RXAPP:MO=RXORG-tg no;RXCAP:MO=RXOTG-tg no,SUBORD;RXMOP:MO=RXOTG/CF/TRX/TX;

Cell Health Checkuprlncp:cell=xxx (to get neighbors) rlnrp:cell=xxx, cellr=xxx; (to get neighbors relation) rldgp:cell=xxx (to get GSM type and CHGR) rlmfp:cell=xxx (to get MBCCHNO, active and idle) rlcxp:cell=xxx (to get DTXD state) rlcpp:cell=xxx (to get power of cell) rlchp:cell=xxx (to get Configuration Frequency Hopping Data) rlcfp:cell=xxx (to get the DCHNO of cell) rlslp:cell=xxx (to get Supervision of Logical Channels Availability) rlbdp:cell=xxx (to get GPRS state). rldep:cell=xxx (to get Description Data). rlgap:cell=xxx (to get channel group allocation data) rllop:cell=xxx (to get all power) rlhpp:cell=xxx (to get channel allocation profile) rllpp:cell=xxx (to get cell locating penalty). rllfp:cell=xxx (to get cell locating filter). rlldp:cell=xxx (to get cell locating disconnect) rlihp:cell=xxx (to get system information Intracell handover) rlssp:cell=xxx (to get system information) rlsbp:cell=xxx (to get system info BCCH) rlbcp:cell=xxx (to get dynamic BTS power) rlprp:cell=xxx (to get differential channel allocation) rllcp:cell=xxx (to get cell load sharing) rlbdp:cell=xxx (to get radio control cell config BPC)