[信息与通信]tems基础知识.ppt

August 11, 2000
Jim Luan, Lin Mubao
Drive Test Log analysis
2018/2/15
1
Drive Test Procedure
Drive Test
Netplan
FICS
Statistics Analysis
Problem Finding
VOT/GEP
Preparation
2018/2/15
2
Preparation (1)
Definition File
Without it, it is impossible to observe overshooing neighbors
can convert FP to definition file
Neighbor list with definition file
Neighbor list without definition file
2018/2/15
3
Preparation (2)
Frequency Plan & Configuration map
Software:TEMS, FICS, GEP, VOT
Hardware: TEMS, GPS, Portable PC
Test Problem Sheet
Route
Map
2018/2/15
4
Drive Test
For Benchmark
2 minutes per call
10 – 15 minutes a log files
Force to appropriate band (GSM only, DCS only or Dual)
For Special Problem
Planning route
No limitation
2018/2/15
5
TEMS Introduction
Interface
Functions
2018/2/15
6
Log File Process
TEMS Log File
NetPlan
FICS
VOT/GEP
.CSV
.FMT
Route Map
.STA
Excel VB
.NP/.TXT
Much shorter cycle time by VOT and GEP.
2018/2/15
7
TEMS .log file Analysis
Undecoded BCCH
BSIC Undecode in Other Site
No Handover
Delay Handover
Ping Pong Handover
Negative Handover
Overshooting
High Overlapping
No Dominant Server
Poor Coverage
Unreasonable Serving Area
Interference
Handover Failure
Handover Loss
UL Drop
Drop Call
Sudden Power Drop
MS Power Rapid Increase
Below mon problems which can be observed from Drive Test Log.
2018/2/15
8
Undecoded BCCH (1)
Description:
BSICs can’t be decoded in 5s
Usually consider 3 strongest neighbors
Reason:
GCLK shift, only decode same site BSICs
Channel interference
Non-BCCH carrier, no dedicated spectrum for BCCH
2018/2/15
9
Undecoded BCCH (2)
2018/2/15
10