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PPEERRFFOORRMMAANNCCEE IIMMPPRROOVVEEMMEENNTTCSSRCDR After TCH ASSHOSRTCH Call Block BH & SDCCH Block BHULQ0-5 & DLQ0-5

11.. RReedduuccee TTCCHH BBlloocckkiinngg Activate DualRate (TCHF TCHD) In Blocking Cells Reduce SD Chanel In DualRate (TCHD) Cells With No SD Block Traffic Share

22.. QQuuaalliittyy OOff TTRRXX PPrroobblleemm UUnnbbaallaannccee UULL--DDLL QQuuaalliittyy ((NNDD 119966)) Swap BCCH Into Better Quality TRX Fix Hardware Problem Poor ULQ may be caused By Overshooting Poor DLQ may be caused By Coo-Chanel / Interference

33.. CCoovveerraaggee AAddjjuussttmmeenntt TTiimmiinngg AAddvvaannccee ((NNDD223322)) Data Cell Distance Range Distribution Per Cell Rx Level Plot List Propose Mechanical Adjustment

44.. DDeeccrreeaassee DDrroopp CCaallll RRaattee Fix Hw Problem Verify Hw Problem On Pendem1 And Sengkaling3 Coverage Adjustment (ND232) Change Mechanical Adjustment (Tilt And Reorientation) Audit TRP - Trx_Priority_In_Tch_Alloc (ZEQO) Push Traffic Camped In Better Quality TRX Audit Adjacent Set HO Parameter in Sites Which Has Low HOSR (ND153)

55.. DDeeccrreeaassee CCaallll DDrroopp WWiitthh AAddjjuusstt VVooiiccee MMoorree PPrriioorriittyy TThheenn DDaattaa GGPPRRSS Setting TRX with the best quality as priority voice (ZEQO parameter TRP) Setting TRX with less quality TRX as priority for data service (ZEQO, ZEQV parameter BFG) Activate GTRX just only on TRX with less quality so traffic data GPRS only available on it

(ZERO) Adjust parameter CDED & CDEF for GPRS capacity, so availability for GPRS can be constantly

(ZEQO)66.. IInntteerrffeerreennccee

Check adjacent frequency Check MAL list, BSIC, MAIO Step Check TO_B1 Tunning power control

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MMMMLL CCOOMMMMAANNDD && NNDD AANNAALLYYSSIISS ffoorr OOPPTTIIMMIIZZAATTIIOONN1. ZERO, ZEQO, ZEAO, ZEEI, ZEHO collect data parameter2. ND153 : Check ADJACENT3. ND196 : Check TRX Quality4. ND232 : Check Timing Advance

MMMMLL CCOOMMMMAANNDD TTRROOUUBBLLEESSHHOOOOTTIINNGG::ZEOH:2008-07-04:NR=xxxx;ZERS:BTS=xxxx,TRX=xx,CH=xx:U;ZERS:BTS= xxxx,TRX= xx:L;ZDTI:::PCM=ET; Status LAPDZDTC:T0769: SignalingZEEI::BCSU; Kapasitas trx per BCSUZUSI:BCSU; Status spare BCSUZEQO:BTS=XX:MIS; Check configure FRL/FRUZEAO; Adjcent cellZYMO: Status transmisi BER

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Air Abis A-Ter A

AAccttiioonn ffoorr OOppttiimmiizzaattiioonn1. KPI2. Consistency Check3. Parameter :

Default: HO margin, Retrans_max, Rx_Tx Power, Ms_Tx Power. Planning: Adjacent, Freq./Channel, MAL (Mobile Allocation List), HSN (Hopping Sequence

Number), BSIC (Base Station Indicator Code), MAIO (Mobile Allocation Indication Offset).

Dropped Call Signal strength, Bad Quality, HardwareBlocked Call Capacity, Upgrade, Sharing TrafficHO Fail Signal Strength, Timer Expire, Inter MSC, Inter BSC, Synchronization FailCall Setup Fail Signal Strength, Bad Quality, Check NeighbourSDCCH MOC (Mobile Originating Call) / MTC(Mobile Terminating Call), LU (Location Update), IMSIAttach/Detach, SMS

MS BTS BSC TC MSC

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SSEETTTTIINNGG PPAARRAAMMEETTEERR SSHHAARRIINNGG TTRRAAFFFFIICC::Contoh setting parameter untuk sharing trafficcell A ke cell B dipermudah, cukup gunakan parameter SL dan PMRG

Adjacencydefault A B B A

PMRG 6 2 8SL -95 -98 -92

cell A ke cell B dipersulit, cukup gunakan parameter SL dan PMRGAdjacency

default A B B APMRG 6 10 2SL -95 -92 -98

Traffic Sharing GSM ke DCS, selain pake SL dan PMRG, aktifkan umbrella nya dengan commandZEHO dan gunakan parameter AUCL,GSM dipermudah ke DCS

Adjacencydefault GSM A DCS A DCS A GSM A

PMRG 6 2 10SL -95 -98 -92

AUCL -47 -88 -47GSM dipersulit ke DCS

Adjacencydefault GSM A DCS A DCS A GSM A

PMRG 6 10 2SL -95 -92 -98

AUCL -47 -80 -47PING-PONG HANDOVER:Aktifkan C2 untuk mengatasi HO terlalu cepat,CRO (-) mencegah HO, CRO (+) menpercepat HO1 temporary offset (T) = 20s maksimal T=31Parameter : TEO, PET,C2 berguna buat konfigurasi microcell selama utk mencegah perpindahan cepat MS dan membuatterjadinya cell reselection yang tidak perlu.OVERSHOOTINGParemeter TXP untuk membatasi coverage agar tidak terlalu melebar, parameter ini sebernya tidakdianjurkan karena dapat mempersempit coverage. nilai yang diijinkan adalah antara -104 s/d -101dBmPATHLOSSapabila yang terjadi adalah DCS pathloss nya lebih tinggi dari gsm, maka:

1. setting parameter C2 for GSM2. increase RXP3. menaikkan lower uplink power control4. mempersulit HO to GSM (HO,reselection,dgn logika DCS lebih bagus dr GSM)5. check tilting antenna

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CCaallll AAcccceessss

1. Cell Barred2. C1>03. MS class Allowed.

C1 = (Rx_lev Rx_lev_Access_Min) Max(MS_TxCCH,0 MS_Tx Power)Cell Reselect HysteresissHyst = 4 dB 14 dBCara membatasi coverage:

1. Down Tilt.2. MS_TxCCH.3. Rx_lev_Acces_min.4. Reduce Power.5. Adjacency.6. Negative C2 = C1 CRO (Cell Reselection Offset) with PT(Penalty Time) = 31.7. Coba: Retrans = 1.

D_max = 9 (Untuk membatasi coverage, due to rural area)

Parameter AccessNo = cell barredPLMN permitted : 0 7 active.Yang perlu diperhatikan untuk create handover target: LAC, CI, BSIC, BCCH. Jika antar MSC, loadingMML and RNW.TSC = BCC.Power control = disable.Layering:Untuk idle mode:

- Macro GSM- Macro DCS, C2 = C1 + CRO (10 dB with PT=10 detik)- Micro GSM- Micro DCS- Indoor.

Untuk Dedicated Mode- FMMS- AUCL = -80- FMT = 4 s.

A B

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HHAANNDDOOVVEERRNote: HO terjadi saat MS terkoneksi (dedicated), pada saat idle disebut Cell Selection atau CellReselectionTerjadinya HO pada Cell Server ditentukan oleh:

1. PBGT (Power Budget)2. Level DL / Level UL3. Quality4. Time Advance5. Umbrella6. FMMS (Fast Moving Mobile System)

Note: Normal HO di set sesuai Power Budget, Emergency HO di set sesuai Level, Quality, TimeAdvance, Umbrella, FMMSPada PBGT HO terjadi saat Source HO dan Target HO terjadi selisih 4 dbm hingga 10 dbm,tergantung Margin yang diset (Margin Minimum=4 db)Kondisi Server HO dan Target HO sebelum terjadi HO

Server N1 (Neighbour 1)BCCH 12 14Signal Strength -60 db -75 dbQuality 0 0TA 1 2Kondisi Server HO dan Target HO setelah terjadi HO

Server N1 (Neighbour 1)BCCH 12 14Signal Strength -75 db -60 dbQuality 0 0TA 2 1Signal Strength antara Server dan Target HO telah memenuhi syarat Margin 4-10 dbmPada Level DL/UL terjadinya HO di set sesuai tingkat level yg telah di set (-95 dbm Source harus HOke Target)Kondisi Server HO dan Target HO sebelum terjadi HO

Server N1 (Neighbour 1)BCCH 12 14Signal Strength -60 db -75 dbQuality 0 0TA 1 2Kondisi Server HO dan Target HO setelah terjadi HO

Server N1 (Neighbour 1)BCCH 12 14Signal Strength -95 db -60 dbQuality 0 0TA 2 1Secara normal Source harus sudah HO ke Target, karena HO di set pada level -95 dbm maka HObelum bias terjadi, ketika level signal strength mencapai -95 dbm Source baru HO ke Target

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HHOO LLaayyeerriinngg ((UUmmbbrreellllaa ddaann FFMMMMSS))UmbrellaTerjadinya HO dari sistem GSM900 ke DCS1800 di tentukan oleh nilai AUCL (AUCL=-75 dbm), saatMS mendekati dual band site (GSM900 dan DCS1800) secara otomatis DCS1800 akan bertindaksebagai Server, setelah menjauh dari site baru GSM900 yang menjadi ServerFMMSDitentukan oleh nilai FMT (Fast Moving Threshold) FMT=5 detikCall Setup Connected HOGSM GSM DCSServer=-50 Server=-50 Server=-80N1 DCS=-90 N1 DCS=-80 N1=-55HO Saat IdleHO 1 = Cell SelectionHO 2 = Cell Recelection Hysterisis (CRH)HO 2 terjadi jika threshold = 6 dbm atau sesuai nilai CRO (Cell Reselect Offset) yg ditentukanC1 = Nilai Level Server yg sebenarnyaC2 = Nilai Level Server setelah dilogik dengan nilai CROServer=-74N1=-70Secara normal harus terjadi HO ke N1, tetapi CRO sudah diset 6 dbm maka secara logical level Servermenjadi -74 + CRO(6 dbm) sehingga tidak terjadi HO ke N1

KASUS-KASUS GSM1. Signal Strength Low2. Bad Quality3. HO Fail4. Call Drop5. Call Block6. Call Setup Fail

Signal Strength LowServer DCS = -97 GSM = -80Kemungkinan penyebab:

- New Site?- Antenna Tilting?- Antenna Clearance?- BTS Installation?

Server GSM lebih kuat dari DCS nyaKemungkinan penyebab:

- Neighbour belum di create- BCCH TRX bermasalah- BCCH TRX Low Power

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Server DCS lemah GSM kuatKemungkinan penyebab:

- AUCL terlalu kecilServer DCS kuat GSM lemahKemungkinan penyebab:

- TRX problem- DCS Insatallation problem

Server GSM kuat DCS lemahKemungkinan penyebab:

- DCS Installation problem- Umbrella (AUCL=-75)

Note: Kurangnya HO bisa mengakibatkan Signal Strength Low dan Bad Quality sehingga dapatmenyebabkan Dropped Call or Blocked Call.HO FailKemungkinan penyebab:

- Signal Strength Low- Timer Expire- Inter MSC- Inter BSC- Synchronization Fail (clock)

Call DropKemungkinan penyebab:

- Signal Strength Low- Bad Quality- Target HO belum di buat

Call Setup FailKemungkinan penyebab:

- Signal Strength Low- Bad Quality- Unpropper Neighbour (Tetangga yg tidak sesuai)

Call BlockKemungkinan penyebab:

- Signal Strength Low- Bad Quality- Target HO belum di buat

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Analisa Pada sesi drivetest, Untuk analisa sebaiknya kita gunakan Rx full atau sub? Perlu diketahuibahwa:

1. Bila DTX diaktifkan Maka perlu digunakan Rx sub2. Rx sub merupakan pengukuran lebih kecil dari Rx full untuk idenifikasi sinyal dengan data

kosong atau tidak.3. Jika DTX dimatikan pengukuran lebih valid dengan Rx full begitu juga sebaliknya.4. BER jelek mungkin ada gangguan signaling dari tx transmit, antara air interface BTS dan

yang diterima oleh ms5. angka half rate 0-17, full 17-26 enhance rate 26-306. MS power sebagai indikasi power yang dipancarkan oleh MS, jika nilainya 0 maka power

maksimal.

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RREEFFEERREENNSSII NNEETTWWOORRKK DDOOCCTTOORRNOKIA ND BROWSER OSS4.1=======================================================Fault Management027 BTS outages breakdown over 10 daysConfiguration ManagementFind Cell042 Whole radio networks sorted out by BSC, BCF, BTS (042)043 All cells with LAC and CI (043)050 Find locked BCFs, BTSs, TRXs and channels (050)051 Find cells having GPRS enabled TRXs (051)Adjacencies070 BTSs with maximum number of adjacencies (070)071 Cells with minimum number of adjacencies (071)074 Adjacencies of cells (074)Network Entities090 Network configuration summary (090)054 Segment configuration (054)Frequencies111 Frequency plan (111)Checks065 Adjacencies to non-existing or foreign cells (slow, 065)060 Adjacency discrepancies (060)061 Non-symmetrical adjacencies (061)062 Frequency check of adjacent cells (062)069 Adjacent cell double frequencies (069)076 Adjacent cells with the same NCC, BCC and frequency (076)067 Handover synchronization (067)068 BTS parameter survey (068)063 BTS audit (063)Performance Management BSSSDCCH and TCH Access, availability134 Cells having RACH rejections (134)130 Cells having SDCCH congestion (130)135 Cells having TCH congestion (135)138 Cells having TCH blocking, raw and call blocking (138)139 Cells having unavailable radio timeslots (139)Handover150 Cells having high HO failure ratio (150)153 Adjacencies having high HO failure ratio (153)154 Handover cause distribution, by cells (154)151 Common BCCH, Multi-BCF HO, cell-level (151)151 Common BCCH, Multi-BCF HO, BSC-level (151)

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282 Cell Reselection, BTS level (282)288 Cell Reselection, adjacency level (288)Drop Call163 Cells having high TCH drop call ratio (163)164 Transcoder failures (164)166 SDCCH Drop ratio per cell (166)167 Cells having high drop call count in handovers (167)Traffic and Load182 Busy hour traffic for all cells (182)181 Daily TCH traffic profile for a BTS (181)185 Cells having maximum TCH traffic (185)186 Cells having maximum paging traffic (186)189 Cells sorted out by SDCCH or TCH holding time (189)Interference, Quality and Link Balance190 Cells having UL interference, 24-hour/10-day breakdowns (190)196 UL and DL quality and UL interference per TRX, 24-hour/10-day breakdowns (196)197 UL and DL quality per TRX (197)244 Distribution of call samples by codecs and quality classes (BER) (244)245 Distribution of call samples by codecs and quality classes (FER) (245)246 AMR call time and quality, dynamic time and object aggregation (246)195 Cells by DL and UL level balance (195)191 Cells having bad link balance (191)208 Link balance per TRX (208)(E)GPRS229 GPRS KPI (229)226 (E)GPRS KPIs, enhancements from 229 (226)235 GPRS counters (235)275 EGPRS RLC statistics (275)280 Dynamic Abis (280)257 Sleeping GPRS BTSs (257)284 Gb Over IP (284)(E)QoS270 Quality of Service (270)281 EQoS (281)289 EQoS Quality Control (289)AMR244 Distribution of call samples by codecs and quality classes (BER) (244)245 Distribution of call samples by codecs and quality classes (FER) (245)246 AMR call time and quality, dynamic time and object aggregation (246)247 Transcoder failure ratio (247)248 Codec set modification failure ratio (248)PBS260 Position based services (260)DFCA

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276 DFCA (276)277 DFCA Assignment Quality (277)Other BSS PM203 Location update success ratio per BSC (203)522 BSC ET Profile (522)278 Wireless Priority Services PI (278)Benchmark and analysis213 BTS Doctor. (213)

BTS doctor with all selectionsBTS doctor with configuration and parametersBTS doctor with adjacencies or alarmsBTS doctor with performance statistics

216 BTS analyser (216)BTS analyser with all or cell performance profile selectionBTS analyser with configuration and parametersBTS analyser with performance statisticsBTS analyser with adjacency checks or alarm statistics

290 Planning and Optimisation KPIs (290)802 (E)GPRS Benchmark KPIs (802)204 Network benchmark statistics (heavy, use small area, 204)800 Quality survey (800)205 BTS GSM KPI/PI table, dynamic object and time aggregation (205)206 TRX level GSM KPI/PI table, dynamic object and time aggregation (206)212 BSC doctor (212)Extra022 Active base station alarms (022)234 Timing advance distribution per TRX (234)