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General information1. Normal assignment = MTC and MOC
MOC = Mobile Originating Call : Request for calling
MTC = Mobile Terminating Call : Request for answering call
2. TCH assignment = Normal assignment + Incoming Handover assignment
3. Attempt = Request success with no blocking
4. Blocking = Attempt not success
5. Failure = Attempt success but not occupy
6. Drop = Loss of connection
7. Success = Calculate since request
8. EFR = Calculate since attempt success
Note: EFR = Ef ficiency Rate
9. Handover = Changing to new TCH channel in same cell or other cell which has good radio condition or special case
dB Transformation for Power and Voltage
dB Power dB Voltage Ratio Approximated value
6 12 x 3.98 4
5 10 x 3.16 3.2
4 8 x 2.51 2.5
3 6 x 1.99 2
2 4 x 1.58 1.6
1 2 x 1.26 1.3
0 0 1 1-1 -2 / 1.26 1.3
-2 -4 / 1.58 1.6
-3 -6 / 1.99 2
-4 -8 / 2.51 2.5
-5 -10 / 3.16 3.2
-6 -12 / 3.98 4
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dB Power dB Voltage Ratio Approximated value
. . . .
. . . .
1000 2000 1000 1000
100 200 100 100
. . . .
. . . .
20 40 20 20
10 20 10 10
0 0 1 1
-10 -20 -10 -10
-20 -40 -20 -20
. . . .
. . . .
-100 -200 -100 -100
-1000 -2000 -1000 -1000
. . . .
. . . .
Power (dB) = 10 log P P = 10^(Power (dB)/10)
Voltage(dB) = 20 log V V = 10^(Voltage (dB)/20)
dB is the difference of level but dBm is the unit in dB with reference from 1 milliwatt so we cannot use dBm to explain the
difference of level e.g. the different power between TRE 1(40 dBm) and TRE 2 (42 dBm) is 2 dB.
EIRP (Effective Isotropic Radiated Power) = Radiation power from Antenna with reference to Isotropic point source.ERP (Effective Radiated Power) = Radiation power from Antenna with reference to Dipole antenna.
EIRP = ERP + 2.15 dB
(Antenna)Gain = Maximum power in direction of maximum directivity.
Beam width (HPBW) = Width of antenna pattern at - 3 dB power decrease in direction of
maximum gain.
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Radio measurement
Rx Quality Rx level
Level Value in OMC-R Average BER Range of BER Power(dBm) FS(dBuV/m) Level number
0 14 0.14 <0.2 -110 27 0
1 28 0.28 0.2-0.4 -109 28 1
2 57 0.57 0.4-0.8 -108 29 23 113 1.13 0.8-1.6 . . .
4 226 2.26 1.6-3.2 . . .
5 453 4.53 3.2-6.4 . . .
6 905 9.05 6.4-12.8 . . .
7 1810 18.1 >12.8 -49 88 61
Color Power (dBm) -48 89 62
Brown -65 to -10 -47 90 63
Red -74 to -65Yellow -82 to -74
Green -92 to -82
Grey -106 to -92
Note:
1. Color bar is reference from drive test criteria (North Region)
2. Worst Rx quality is level 7.
3. Power (dBm) = 10 log (P/1mW)4. BER = Bit Error Rate
5. FS = Full ScaleStandard C/I =
Standard C/A =
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Interference band (Noise signal strength effecting to C/I)
Logicalname
HMI name B8 DefaultTAO_Macro
(B8)TAO_Micro
(B8)TAO_Indoor
(B8)Unit
INTFBD1Interferencebands 1-2 limit
-100 -100 -100 -100 dBm
INTFBD2Interferencebands 2-3 limit
-95 -95 -95 -95 dBm
INTFBD3Interferencebands 3-4 limit
-90 -90 -90 -90 dBm
INTFBD4Interferencebands 4-5 limit
-85 -85 -85 -85 dBm
INTFBD5Interferenceband 5 upperlimit
-47 -47 -47 -47 dBm
Interference can be from internal (512-574) or external (e.g. microwave, other PLMN).
Example : Noise level is in interference band 3 and RF signal level from serving cell is -85 dBm then C/I = 15 dB.
Microwave modulation
DXR 16 QAM
XP-4 QPSK
Eclipse 16 QAM
Note: QAM can check constellation to confirm Power distribution in each phase
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Upgrade work
UATRX Simple TRX upgrade
UASC Add second cabinet upgrade
UADO Double antenna upgrade
UADA Double antenna upgrade with second cabinet
UBAT Battery upgrade
UREC Rectifier module upgrade
UCANT Change antenna upgrade
UDON FSR upgrade phase SP11
Address mapping between OMC-R and BTS terminal program
Address of hardware in BTS cabinet=>Trad/Tadh uses 3 slots 1(81) 4(84) 7(87) 10(90) TREs Shelf 5 80
=>ANCD uses 4 slots 3(67) 7(71) ANCDs Shelf 4 64
=>SUMA uses 2 slots 1(49) 4(51) 7(55) 10(58) TREs Shelf 3 48
=>Trdh uses 4 slots 3(35) 7(39) ANCDs/SUMA Shelf 2 32
1(17) 4(20) 7(23) 10(26) TREs Shelf 1 16
See in Note
1 4 7 10
Address 1,2,7,10 For TRE
Address 3,11 For ANCAddress 7,11 For SUMA
Standard
Note: Add to default address as below to find real address in BTS terminal program
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MOC (No failure)
TEMS Comment GSM Standard Comment
1.Call AttemptChannel RequestNote: MS1
1.Radio LinkEstablishmentPhase
RACH for SDCCHNote : MS2 attempt to response Paging message
2.Dedicated Mode BCCH & BSIC 2.Since SDCCHphase
Use SDCCH for TCH assignment request
3.Call Setup Alerting3.Alert andConnecting phase
After TCH assignment complete sent from BSC toMSC in TCH assignment phase or TCH assignmentcompleted (No blocking or failure)
4.Call Establishment Connect Acknowledge4.Alert andConnecting phase
After received Alerting signal and connecting signalfrom MSC,MS will send connected acknowledge back to MSCthen the conversation begin
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Call Complete/No drop:CCRRequest (RACH) for Traffic channel(Mobile Originating Call :MOC)
Sdcch blocking( No available SDCCHresources )
Immediate Assignment(AGCH)
Assignment fail SDCCH
Attempt(Assignment success)
SDCCH PhaseDrop SDCCH
No TCH resources TCH assignment blocking
TCH assignment TCH assignment failure
TCH assignment success
C S S R
Using TCH channel
Request new channel(Same cell/Other cells)
Drop by radio condition or BSS problem
Changing to next TCH channel(Handover)
1-Drop between handover2.Handover failure
3.Handover blocking4.HO drop
Occuply new channel(No blocking, failure and drop)
Drop by radio condition or BSS problem
H
O S R
C
D R
( R L T / H O / B S S )
Call end by normal release CSR/CCR: No call drop
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During call:CDR
After TCH assignment success
Radio condition
Drop due to radio link failureTCH drop radio
Hardware Problem
Radio conditionDuring handover
(Cannot Retune to old channel) TCH drop HO
Hardware Problem
TCH drop BSS internalSome HW problem in BSS part
(Excluding Transcoder)
TCH drop BSS RTC
1.Faulty MT120 card (RTC)2.Transmission network problem3.Faulty TRE4.RSL error5.Faulty TCU
Call handle on Traffic channel
T y p e o f C a l l D r o p
BSS problem(Connection lossafter Air interface)
Call Completed/No drop call: Normal release
Radio condition: 1. Coverage (Downlink) 2. Frequency (Interference) 3.Unbalance PBGT (Uplink)
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Assignment call:CSSRNo Sdcch resource due to HW
failure
No Sdcch trafficCannot allocate SDCCH
Congestion on sdcch channel
Sdcch immediate assign block
Sdcch assign fail radioDue to radio conditon(Include
HW
problem for Motorola)
Sdcch assign fail BSS Due to BSS problem
Request for SDCCH
Sdcch immediate assignment failure
Sdcch drop radio Due to radio condition
Sdcch drop HO: not activate now
Sdcch drop BSS Due to BSS problem
SDCCH assignment success Sdcch drop
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Cannot allocate TCHSector locked or hardware
locked
TCH assign blocking(Congestion on TCH channel) No TCH resource available
TCH assign fail radio Due to radio condition
TCH assign fail BSSPreparation phase
TCH assign fail BSS_internal
TCH assign fail BSS_RTC
TCH assign failure
TCH assignment success =>Call Setup Success (No any failure)<=
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Handover Process: HOSR
Relate withincoming HOblocking
No new TCHchannel
at target cell
High traffic at targetcell
Cannot allocate new TCH channelRequest for new TCH channel
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Hardware problem
at target cell
Co BSIC&BCCHRelate with
incoming handoverfail radio
Interferenceat target cell
Handover failure Reverse toold
channel
HOdrop radio
RF lossbetween handover
Handover drop(HO cmd sent but no HO accesss)
HOdrop BSS
BSS problembetween HO
Handover notsuccess
(Only outgoing)
Request success/Handover is inprogress
Handover notsuccess both inand out in every
sectors
Handover failure both incoming andoutgoing beween source and target
(two ways)
Incoming handover fail andoutgoing handover ROC at the
same time
in every sectors
Hardware problem(Processer unit)
Occupied new TCH at target cell Handover success
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Minor KPI Comment KPI
SDCCH(Signalling channel in Idle mode) From idle mode to dedicated mode
SDCCH Assignment request
SDCCH (immediate) assignment blocking Cannot assign/no SDCCH resource
SDCCH (immediate) assignment failure (Radio) Assignment is in progress but radio problem occur
SDCCH (immediate) assignment failure (BSS) Assignment is in progress but BSS problem occur
SDCCH Assignment completed Remains in SDCCH channel.
SDCCH drop (Radio) Assigned SDCCH but radio problem occur
SDCCH drop (BSS) Assigned SDCCH but BSS problem occur
SDCCH drop (HO) Not activate now
TCH(Traffic Channel) From SDCCH to TCH with no SDCCH drop
TCH Assignment is in progress
TCH assignment blocking Cannot assign/no TCH resource
TCH assignment fail (Radio) Assignment is in progress but radio problem occur
TCH assignment fail (BSS) Assignment is in progress but BSS problem occur
TCH assignment fail (PREP BSS) Not include BSS problem and congestion problem
C a l l S e t u p
S u c c e s s R a t e ( C S S R
)
TCH Assignment completed Occupied TCH channelTCH drop (Radio) Radio problem occur while handle call in dedicated mode
TCH drop (BSS_INT) BSS(internal BSS part) problem occur while handle call in dedicated mode
TCH drop (BSS_RTC) BSS (Transcoder) problem occur while handle call in dedicated mode
TCH drop (HO) Drop while handover from source to target cell C a l l D r o p R a t e ( C D R )
Changing TCH channel/HandoverReselect new traffic channel due to better or conditionfrom handover cause split
Outgoing handover fail ROC(Reverse to Old Channel)Cannot occupy new traffic channel due to failure at target cellbut no drop (can return to old source cell)
Outgoing handover drop Cannot occupy new traffic channel and drop, radio is the main cause
Outgoing handover fail no alloc(not allocate new TCH)Cannot occupy new traffic channel due to no TCH resource at target cell
Outgoing handover fail BSS Cannot occupy new traffic channel due to BSS problem H a n d o v e r
S u c c e s s R a t e ( H O S R )
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Main KPI Counter
1.Traffic channelTCH assign failure
TCH assign fail radio =>MC746B
TCH assign blocking =>MC812
TCH assign fail prep BSS =>MC140A-MC140B-MC812
TCH_HO_Succ => MC642+MC652 (Ext HO+INT HO): Incoming HO success
TCH_Ass_Succ => MC718: Normal assign success per TRX (MOC)
Call drop
Call drop radio (RLT) =>MC736
Call drop BSS_RTC =>MC739
Call drop BSS_INT =>MC14C
Call drop HO =>MC621
2.SDCCH channel
SDCCH assign failureSDCCH assign fail radio =>MC149
SDCCH assign blocking => MC04
SDCCH drop
SDCCH drop radio => MC138
SDCCH drop HO => MC07
SDCCH drop BSS => MC137
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Basic concept
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SDCCH Template
#TRX STD(Normal) ADD(Extended) STDDYN(Normal Dynamic) ADDDYN(Extended dynamic)
1 8 Static 8 Static 8 Static 8 Static1 TRX can have only 1 SDCCH
timeslot
2 8 Static 16 Static 16(Standard+new 8 dynamic) 16 Static Normal Dynamic
3 16 Static 24 Static 24(Standard+new 8 dynamic) 24 Static Normal Dynamic
4 16 Static 24 Static 24(Standard+new 8 dynamic)32(Normal dynamic/static+new 8
dynamic)Extended dynamic
5 16 Static 24 Static 24(Standard+new 8 dynamic)32(Normal dynamic/static+new 8
dynamic)Extended dynamic
6 24 Static 32 Static 32(Standard+new 8 dynamic)40(Normal dynamic/static+new 8
dynamic)Extended dynamic
7 32 Static 40 Static 40(Standard+new 8 dynamic)48(Normal dynamic/static+new 8
dynamic)Extended dynamic
8 32 Static 40 Static 40(Standard+new 8 dynamic)48(Normal dynamic/static+new 8
dynamic)Extended dynamic
Same number of SDCCH but difference
functional
Condition for SDCCH configuration.
SDStatic SDCCH (Config with odd TRX e.g. TRX 1, 2,3etc.)
SDExtended SDCCH : Add more due to not enoughSDCCH
Dyn SD Standard dynamic SDCCH (Normal dynamic)Dyn SD Extended dynamic SDCCH
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SDCCHconfiguration
Number of TRX TS definition for micro and macro cell
TS0 TS1 TS2 TS3 TS4 TS5 TS6 TS7 TRX_PREF_MARK
1 TRX TRX 1 BCC TCH TCH TCH TCH TCH TCH SD 0
TS0 TS1 TS2 TS3 TS4 TS5 TS6 TS7
2 TRX TRX 1 BCC TCH TCH TCH TCH TCH TCH SD 0
TRX 2 Dyn SD /SD TCH TCH TCH TCH TCH TCH TCH 0
TS0 TS1 TS2 TS3 TS4 TS5 TS6 TS7
3 TRX TRX 1 BCC TCH TCH TCH TCH TCH TCH SD 0
TRX 2 Dyn SD /SD TCH TCH TCH TCH TCH TCH TCH 0
TRX 3 SD TCH TCH TCH TCH TCH TCH TCH 0
TS0 TS1 TS2 TS3 TS4 TS5 TS6 TS7
4 TRX TRX 1 BCC TCH TCH TCH TCH TCH TCH SD 0
TRX 2 Dyn SD /SD TCH TCH TCH TCH TCH TCH TCH 0
TRX 3 SD TCH TCH TCH TCH TCH TCH TCH 0
TRX 4 TCH/ Dyn SD TCH TCHTCH TCH TCH TCH TCH 0
TS0 TS1 TS2 TS3 TS4 TS5 TS6 TS7 5 TRX TRX 1 BCC TCH TCH TCH TCH TCH TCH SD 0
TRX 2 Dyn SD /SD TCH TCH TCH TCH TCH TCH TCH 0
TRX 3 SD TCH TCH TCH TCH TCH TCH TCH 0
TRX 4 TCH/ Dyn SD TCH TCHTCH TCH TCH TCH TCH 0
TRX 5 SD TCH TCH TCH TCH TCH TCH TCH 0
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TS0 TS1 TS2 TS3 TS4 TS5 TS6 TS7
6 TRX TRX 1 BCC TCH TCH TCH TCH TCH TCH SD 0TRX 2 Dyn SD /SD TCH TCH TCH TCH TCH TCH TCH 0
TRX 3 SD TCH TCH TCH TCH TCH TCH TCH 0
TRX 4 TCH/ Dyn SD TCH TCHTCH TCH TCH TCH TCH 0
TRX 5 SD TCH TCH TCH TCH TCH TCH TCH 0
TRX 6 TCH TCH TCH TCH TCH TCH TCH TCH 0
TS0 TS1 TS2 TS3 TS4 TS5 TS6 TS7
7 TRX TRX 1 BCC TCH TCH TCH TCH TCH TCH SD 0TRX 2 Dyn SD /SD TCH TCH TCH TCH TCH TCH TCH 0
TRX 3 SD TCH TCH TCH TCH TCH TCH TCH 0
TRX 4 TCH/ Dyn SD TCH TCHTCH TCH TCH TCH TCH 0
TRX 5 SD TCH TCH TCH TCH TCH TCH TCH 0
TRX 6 TCH TCH TCH TCH TCH TCH TCH TCH 0
TRX 7 SD TCH TCH TCH TCH TCH TCH TCH 0
TS0 TS1 TS2 TS3 TS4 TS5 TS6 TS7 8 TRX TRX 1 BCC TCH TCH TCH TCH TCH TCH SD 0
TRX 2 Dyn SD /SD TCH TCH TCH TCH TCH TCH TCH 0
TRX 3 SD TCH TCH TCH TCH TCH TCH TCH 0
TRX 4 TCH/ Dyn SD TCH TCHTCH TCH TCH TCH TCH 0
TRX 5 SD TCH TCH TCH TCH TCH TCH TCH 0
TRX 6 TCH TCH TCH TCH TCH TCH TCH TCH 0
TRX 7 SD TCH TCH TCH TCH TCH TCH TCH 0
TRX 8 TCH TCH TCH TCH TCH TCH TCH TCH 0
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TMA concept
TMA is using for amplifier Rx level from mobile (MS) in uplink path.
TMA help to improve call drop due to radio condition (low UL level) and also improve TCH assignment both normal
assignment (MOC/MTC) and incoming handover.
However TMA not help for cell which has no uplink level problem, by the way the downlink level will be decreased from
TMA.
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BTS cabinet for Indoor
MBI 3 => 8 TRXsMBI 5 => 12 TRXs
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BTS cabinet for Outdoor
MBO 1 => 8 TRXs
MBO 2 => 12 TRXs
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There are 2 modes for TRX configuration with ANC, one is Non-combining mode or Low loss mode and another one is
Combining mode.The first one is using for configuration up to 2 TRXs and another one is using for configuration up to 4 TRXs (Per 1 ANC).
1. Configuration for low loss mode.
2. Configuration for combining mode.
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1. Low loss configuration loss 1.8 dB.
Note: For 1 ANCD and TRE up to 2
2. Combining configuration loss 5.1 dB.
Note: For 1 ANCD and TRE up to 4
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Data from Site Inspection work.
EDGE type TREs which are Tadhe and Trade help improve TX power in DL.
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Micro BTS configuration
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Basic knowledge to analyze BTS hardware problem.
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BSS Abbreviation
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Reference: 1.GSM_Trouble_Shooting.xls 2.Alcatel BSS Description.pdf 3.PM Counters.pdf 4.B8Clist.pdf 5.BSS Telecom Parameters.pdf