TD-LTE Project

www.huawei.com

www.huawei.com

Interference InvestigationTD-LTE Radio Network Optimization

Author/ Email: Ray Khastur

Version: V1.0(20130727)

2

Author / ID Ray Khastur

Co-author / ID

Approver / ID

Description VVIP Area Interference Analysis

Interference Investigation

Using TD-LTE Spectrum Analyzer and eRAN

TDD FMA

4

M2000-Interference Monitoring

On the M2000 for site Imperial Arya Duta we can see there is high UL interference detected.

* UL Subframe 0 and 6 used for TDD Long Distance Interference Analysis

** UL Subframe 0 and 11 used for GPS Interference Analysis

5

Call History Log Analysis

Based on CHR Data,

Service Drop occur

when UL Radio

Condition detected

UL Interference

MatLAB Analysis

7

PCI Conflict Check

There is no PCI

conflict detected

8

Frame Structure

D D D D D DS

UUS

9

Animation of Interference on Special Subframe

Dw Dw Dw Dw Dw Dw Dw Dw Dw Dw GP GP Up Up

0 1 2 3 4 5 6 7 8 9 10 11 12 13

In Guard Period

should be there is

no activity detected

during this silent

period.

We can conclude

the Interference

occur in every time.

10

Animation of Interference on UL Subframe

F1

F2

F3

F4

Subframe 2 used

for UL Data, there

are 4 in band

external source with

different signal

strength of

Interference