20 April 2023

Panduan Singkat Problem RTWP

Prepared by SME Team

Huawei Confidential

Pengukuran RTWP

RTWP adalah salah satu kriteria pengukuran kualitas

uplink channel

RTWP : Received Total Wideband Power (UE signal + UL

interference) Dikenal juga sebagai UL RSSI (Received Signal Strength Indicator) RTWP = Measured RTWP - GAIN Faktor2 yang mempengaruhi RTWP:

Air-interface signal (RTWP aktual yang diterima antenna) Feeder connection (RTWP aktual yang masuk ke TRX board) Internal parameter settings di TRX module (GAIN)

Note: Apabila terdapat external amplification unit (e.g TMA), GAIN dari

perangkat ini harus dimasukkan dalam perhitungan, sebagai channel

attenuation.

Page 2

Huawei Confidential

Setting standar untuk Attenuation di RX BranchPage 3

MO RxBranch

Parameter ID ATTEN

Parameter Name

Attenuation

NE NodeB

MML Command

MOD RXBRANCH

Meaning Indicates the attenuation of the RX channel of the RRU.

IsKey NO

Mandatory NO

Feature ID None

Feature Name None

Value Type Interval values

GUI Value Range

0~60

Enumeration Number/Bit

Not involved

Unit 0.5dB

Actual Value Range

0~30

Default Value 0

Recommended Value

When the TMA is not used, this parameter needs to be set to 0. When the 12 dB TMA is not used, this parameter needs to be set to 4 dB to 11 dB. When the 24 dB TMA is not used, this parameter needs to be set to 11 dB to 22 dB.

Cek keberadaan perangkat dual band

combiner di site :

No Combiner Site = 0

With Combiner Site = max 3 dB

(GUI value 6)

Note : Ada 2 tipe dual band combiner yg digunakan

di HCPT, yaitu Kathrein & Fingu.

Huawei Confidential

Problem Umum RTWP and Penyebabnya

Problem TypeProblem Location

Related Problem Description

Problem Uplink Channel

Air-interface channel

External interference

Space characteristics: regional external interference dan site interferenceTime characteristics: intermittent interference dan continuous interferenceSignal characteristics: inter-system interference

Antenna channel Plumbing issues Inter modulation interference, incorrect antenna dan feeder connection, faulty di antenna and feeder components dikarenakan poor antenna and feeder quality

Intra-TRX channel

Incorrect configurations

RF channel configurations : berefek ke RTWP di semua carrier dalam RF channel termasuk channel attenuation configuration, interconnection mode, distributed sector, and single-antenna/dual-antenna modeCarrier configurations: berefek ke RTWP di carrier tersebut termasuk initial RTWP value and desensitization intensity

Hardware failure Hardware failure di RF module termasuk RF Unit Hardware Fault

Problem Capacity Air-interface channel

Service capacity problems

Akibat dari heavy traffic, version upgrade, feature deployment, interference antar neighboring cells

Page 4

Huawei Confidential

Metode untuk Menemukan Problematic RTWP Cell Pilih counter Vs.MinRTWP karena counter in yang paling objektif di antara 3 RTWP counters (Vs.MinRTWP, Vs.MeanRTWP, Vs.MaxRTWP)

Ambil low hour (3 AM) sebagai periode pengamatan

Ambil nilai minimum Vs.MinRTWP dalam 7 hari di minggu yang sama

Taruh threshold >-90 dBm untuk menyusun cell list

Contoh distribusi permasalahan RTWP yang ditemukan di network

Source:

5Presentation title in footer 20 April 2023

Huawei Confidential

Cara Mengecek Configuration Problem dengan MML Command

Page 6

Parameter MML Impact Range Check Point or Recommended Value

RF channel attenuation value

DSP RXBRANCH Sector Diset berdasarkanTMA installation and feeder connection. Umumnya, channel attenuation value = TMA gain-feeder loss

RTWP Initial RTWP value

DSP RXBRANCH Cell Typical setting adalah 0.

RF desensitization value

LST RRU Sector Typical setting adalah 0.

Cell desensitization intensity

DSP DESENS Cell Typical setting adalah 0.

Interconnection mode

LST SEC Sector Diset berdasarkan physical connections and cek juga apakah hardware connection dalam kondisi normal

Cell mode LST SEC Sector Diset berbeda2 untuk single-antenna, dual-antenna, distributed scenarios

TMA gain value DSP TMASUBUNIT

Sector Diset sesuai denganTMA specifications atau settable value.

TMA mode DSP TMASUBUNIT

Sector Umumnya, TMA mode adalah Normal.

Current status on the antenna port

DSP ANTENNAPORT

Sector Umumnya, power switch ON.

Huawei Confidential

Alarm2 yang Terkait dengan Problem RTWP

Page 7

No. Alarm Name

1 ALM-26522 RF Unit RX Channel RTWP/RSSI Unbalanced

2 ALM-26521 RF Unit RX Channel RTWP/RSSI Too Low

3 ALM-26532 RF Unit Hardware Fault

4 ALM-26752 ALD Hardware Fault

5 ALM-26758 TMA Running Data and Configuration Mismatch

6 ALM-26755 TMA Bypass

7 ALM-26757 RET Antenna Running Data and Configuration Mismatch

8 ALM-26541 ALD Maintenance Link Failure

Huawei Confidential Page 8

1. ALM-26522 RF Unit RX Channel RTWP/RSSI UnbalancedTriggering condition: Apabila perbedaan antara RTWP main RX channel dana RTWP diversity RX channel melebihi 10 dB.

Suggested handling procedure:

Antara main dan diversity channels, salah satu memiliki high RTWP dan lainnya normal. Clear alarm sesuai prosedur troublosehooting high RTWP.

Main dan diversity channel memiliki high RTWP dan perbedaan keduanya melebihi 10 dB. Clear alarm sesuai prosedur troublosehooting high RTWP.

Antara main dan diversity channels, salah satu memiliki low RTWP dan lainnya normal. Clear alarm sesuai prosedur troublosehooting high RTWP.

2. ALM-26521 RF Unit RX Channel RTWP/RSSI Too LowTriggering cause: Apabila RTWP/RSSI RX channel di RF unit kurang dari -144 dBm.

Suggested handling procedure:

Salah satu di antara main dan diversity channel memiliki low RTWP. Clear alarm sesuai prosedur troublosehooting low RTWP.

Diversity channel memiliki low RTWP. Untuk indoor site, diversity channel umumnya tidak dikoneksikan ke antena. Apabila kedua RF modules berada di kabinet yang sama, RF interconnection mode bisa di-disable.

Main channel memiliko low RTWP. Untuk indoor site, RX dan TX channels terpisah akibatnya tidak ada uplink signal di main channel.

3. ALM-26532 RF Unit Hardware FaultTriggering cause: RF channel atau RX channel kemungkinan faulty, berakibat ke abnormal RTWP.

Suggested handling procedure: Lakukan soft dan hard reset RF module, cek apakah alarm hilang. Jika tidak, ganti RF module

Huawei Confidential Page 9

4. ALM-26752 ALD Hardware FaultTriggering Cause: TMA gain invalid.

Suggested handling procedure: Replace TMA.

5. ALM-26758 TMA Running Data and Configuration MismatchTriggering cause: TMA gain inconsistent dengan configuration, berakibat ke abnormal uplink TMA gains and RTWP problems.

Suggested handling procedure: Reset gain TMA atau working mode TMA.

6. ALM-26755 TMA BypassTriggering cause: TMA gain is invalid.

Suggested handling procedure: Cek apakah TMA faulty. Jika ya, replace TMA. Jika tidak, set working mode TMA ke normal mode.

7. ALM-26757 RET Antenna Running Data and Configuration MismatchTriggering cause: Tilt angle antenna inconsistent dengan configuration.

Suggested handling procedure: Reset tilt angle antenna terkait.

8. ALM-26541 ALD Maintenance Link FailureTriggering Cause: TMA maintenance links disconnected.

Suggested handling procedure: Cek TMA. Apabila maintenance links TMA tidak dapat di-restore, coba replace TMA.

Huawei Confidential

Cara Melakukan Pengecekan RTWP dengan LMT (sisi RNC)

Page 10

RTWP Real Time User Number di Cell

Huawei Confidential

Cara Melakukan Pengecekan RTWP dengan LMT (sisi Node-B)

Page 11

Petunjuk Setting RTWP Real Time Cell RTWP Tracing

Huawei Confidential Page 12

HCPT AXIS TSEL HCPT INDOSAT

Contoh RX Scanning melalui Node-B LMT (WRFU locked, prosedur penyelidikan External Interference)

Huawei Confidential

Contoh UL Measurement Result Menggunakan Spectrum Analyzer (+ Drive Test, prosedur penyelidikan External Interference)

00 = -100.4 dBm 300 = -131.4 dBm

600 = -125.7 dBm900 = -132.2 dBm

Huawei Confidential

Contoh skenario trial selama troubleshooting RTWP

WRFU Board Combiner AntennaJumper Feeder

Sector 2

A B C D

WRFU Board Combiner AntennaJumper Feeder

Sector 3

W X Y Z

Untuk mengecek Board and Combiner, swap titik B dan X lalu cek ulang nilai RTWP Untuk mengecek Combiner, swap titik C dan Y lalu cek ulang nilai RTWP

Huawei Confidential 15 20 April 2023