Download - How to Analyze CI BER and Intererence in DT
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Security Level:
Slide title :40-47pt Slide subtitle :26-30pt
Color::white Corporate Font :
FrutigerNext LT MediumFont to be used by customers and
partners : Arial
www.huawei.com
How to Analyze C/I,BER and Interference In DT
Content Page Title 35-40pt
Color: R153 G0 B0Corporate Font:
FrutigerNext LT MediumFont to be used by
customers and partners:
Arial
Content Page Text :28-30pt
Bullets level 2-520-30pt
Color:BlackCorporate Font:
FrutigerNext LT MediumFont to be used by
customers and partners:
Arial
Interference
Hardware Problem TRX Problem Feeder & Arrester Problem
Intra-Interference Adjacent channel & Co-channel Intermodulation Interference
Inter-Interference Other Equipment
Content Page Title 35-40pt
Color: R153 G0 B0Corporate Font:
FrutigerNext LT MediumFont to be used by
customers and partners:
Arial
Content Page Text :28-30pt
Bullets level 2-520-30pt
Color:BlackCorporate Font:
FrutigerNext LT MediumFont to be used by
customers and partners:
Arial
Co-Channel & Adjacent Channel Interference
As beside Figure show Station A~D, Supposing the frequency N have already allocated to cell A-3.so frequency N can not be allocate to A1 、 A2 、 B1 、 B2 、 B3 、 C1 、
C2 、 C3 、 D1 、 D2 、 D3; and frequency N±1 can not be allocated to cell A1 、 A2 、 A3 、 B1 、 C2 、 D1 、
D2 (No ,hoping)
Content Page Title 35-40pt
Color: R153 G0 B0Corporate Font:
FrutigerNext LT MediumFont to be used by
customers and partners:
Arial
Content Page Text :28-30pt
Bullets level 2-520-30pt
Color:BlackCorporate Font:
FrutigerNext LT MediumFont to be used by
customers and partners:
Arial
Co-Channel & Adjacent Channel Interference
As below, From the neighbor list ,BCCH 73 interfered BCCH 72,it is adjacent interference. When the co channel or adjacent channel happen
It will bring the strong interference. The typical phenomena:
High RxlevWorst Rxqual
Content Page Title 35-40pt
Color: R153 G0 B0Corporate Font:
FrutigerNext LT MediumFont to be used by
customers and partners:
Arial
Content Page Text :28-30pt
Bullets level 2-520-30pt
Color:BlackCorporate Font:
FrutigerNext LT MediumFont to be used by
customers and partners:
Arial
C/I Problem
C/I Definition C/I: Carry/Interference Optimize C/I method
Improve Coverage Decrease Interference
Content Page Title 35-40pt
Color: R153 G0 B0Corporate Font:
FrutigerNext LT MediumFont to be used by
customers and partners:
Arial
Content Page Text :28-30pt
Bullets level 2-520-30pt
Color:BlackCorporate Font:
FrutigerNext LT MediumFont to be used by
customers and partners:
Arial
C/I Problem due to poor coverage
RxLevel(Serving Cell) is about (or less than) -95 dBm;RxLevel(Neighbours Cell) is about (or less than) -95 dBm;Result: Worst C/I due to poor coverage.
HUAWEI TECHNOLOGIES CO., LTD. Page 7Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
C/I Problem due to poor coverage
RxLevel(Serving Cell) is about (or less than) -95 dBm;RxLevel(Neighbours Cell) is about (or less than) -95 dBm;Result: Worst C/I due to poor coverage.
HUAWEI TECHNOLOGIES CO., LTD. Page 8Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
BER
BER: Bit Rate Error
HUAWEI TECHNOLOGIES CO., LTD. Page 9Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
The solution to Interference,C/I,BER issue (1)
Interference Issue Solution
Serious interference due to Co-channel or Adjacent channel Adjust cell frenquency
Serious interference due to feeder or Arrester Problem
Check whether the Feeder and antenna tightening, or direct replacement its.
HUAWEI TECHNOLOGIES CO., LTD. Page 10Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
The solution to Interference,C/I,BER issue (1)
C/I Issue Solution
Worst C/I due to poor coverageImprove coverage by adjusting antenna azimuth and downtilt or add new sites
Worst C/I to interference Ensure the interference source and solution as interference solution.
HUAWEI TECHNOLOGIES CO., LTD. Page 11Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
The solution to Interference,C/I,BER issue (1)
BER Issue Solution
Worst BER due to poor coverageImprove coverage by adjusting antenna azimuth and downtilt or add new sites
Worst BER due to interference Ensure the interference source and solution as interference solution.
Worst BER due to Transmission Checking transmission alarm in M2000
Worst BER to TRX At first check equipment alarm in M2000,ensure which TRX is problem
Thank youwww.huawei.com