131376877 ERICSSON Optimization Guide

8/20/2019 131376877 ERICSSON Optimization Guide

http://slidepdf.com/reader/full/131376877-ericsson-optimization-guide 1/5

TCH assign failure congestion

Problem detection:

TCH assign. Congestion max. > 2 % (Critical , action needed)

TCH Load BH (Erlang / capacity ) > 90 % (forecast)

Investigation:

Check for hardware availability bycomparing:RTCH_nb (TCRRN) withRTCH_available_avg (TCAVAN)

Any TRXsdown or not

carryingtraffic?

Report to BSS support

team

Any neighborsite(s) down

not carryingtraffic?

Check through thematic map

TCH load BH on cell neighbors.

HO Inc congestion on neighbors.

All neighbors

are loaded(> 80%) + High

Inc HOcon estion

Request for upgrades,Calculate # of combiners needed and check with

RNP if there will be no coverage problem ifadditional combiner is used

Request for Densification sites

RNP

Check with RNP if

planned coverage

overlap with

neighbors is sufficient

for smooth HO flow.

Densification sites needed

Check better condition parameters for each

couple.

Check High HO Inc execution failure onneighbors, if yes follow same investigation in

call drop HO sheet.

Check through drive test (RMS) coverage for

serving loaded cell vs. neighbor free cell.

Antenna optimization needed?

Hardware check needed?

Traffic sharing

Enable FDR on serving cell

Enable Traffic HO for each couple and adjust

relevant parameters according to drive test

analysis. (or leave default values according to # of

TRX)

Enable Fast traffic HO, but monitor HO/callrate and call drop HO specially for cells with

many inter BSC adjacencies

Yes

NO

NO Yes

Yes

NO

NO

Yes



Call drop HO

Problem detection:

1. High call drop rate on the cell > 1 %.

2. % HO drops > 30% of total dropped calls on the cell.

Investigation:

High HO out

execution failurerate? >40 %

No Yes

Majority of

failure isInter BSC?

Check for BCCH/BSICduplication in celladjacencies

For neighbors in different

OMC-R , check if relation isdefined correctly (externalcells)

Check for synchronization problems

Check neighbor plan for

unnecessary (Far) neighbor

declarations.

Yes

Check forBCCH/BSIC duplicationin cell adjacencies

Check for database

inconsistency betweenOMC-R and BSC

NO

Identify critical pair ofcells, (with Out HOdrop > 5 %) usingType 26 (on demand

counter)

High% ROC?

Check DL Qual / UL Qualon target cell to locate

interference problem.

Check DL Lev /UL Lev on

target cell for coverage problem

Check DL Qual / UL Qual on both serving & target cell to locateinterference problem.

Check DL Lev /UL Lev on both

serving & target cell for coverage problem

Yes

NO

Good % of better

condition (>40%)

Yes

NO

*Check better conditions

parameters.*Check for severe

interference on serving cell

* Check for coveragecontinuity

131376877 ERICSSON Optimization Guide

Documents

Transcript of 131376877 ERICSSON Optimization Guide