Upload
ashar-saragih
View
226
Download
0
Embed Size (px)
Citation preview
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 1/86
1 © 2007 Nokia 13-468259 v1.0
Company Confidential
Network Configuration
Optimization
RANOP / 2007
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 2/86
2 © 2007 Nokia 13-468259 v1.0
Company Confidential
Summary
• CM Theory
• BSC Tables
• Default, Specific and Sensitive Parameters
• CM Process• Design default sets
• Consistency Checks
• Review Neighbour Plan
• Review Frequency Plan
• CM Examples
• Examples of wrong parameter set with impact on network
operation/performance
• CM Tools
• Nokia NetActTM Planner, Nokia NetActTM Optimizer and RAC Tools
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 3/86
3 © 2007 Nokia 13-468259 v1.0
Company Confidential
CM Theory
BSC Tables
Default, Specific and Sensitive Parameters
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 4/864 © 2007 Nokia 13-468259 v1.0
Company Confidential
BSC Tables
ADCE POCHOCTRX
BTS
BCF
BSC
RTSL
MA, BA
SEG
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 5/865 © 2007 Nokia 13-468259 v1.0
Company Confidential
Define Default sets
Default Parameters: Almost all parameters areset to default values
Specific Parameters: Are set during planning phase, e.g.frequency, BSIC etc.
Default, Specific, and Sensitive Parameters
Sensitive Parameters:Changes in some default parameters
are quite dangerous as they may
have a critical impact on the network.
Care must be taken.
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 6/866 © 2007 Nokia 13-468259 v1.0
Company Confidential
1. Default parameters
• BSC, BTS, HOC, POC, ADCE, TRX tables
Sensitive parameters
• BTS table: HOP, BAR, PLMN, ACC, RXP, TLC, PMAX, DMAX, TRP, IDLE, ACT, RDIV
• POC table: PMAX, UDR, UUR, LDR, LUD
• HOC table: EPB, HPP, LDWS, LUWS, QDWS, QUWS, QDR, QDP, QDN, QUR, QUP, QUN, LDR, LDP,
LDN, LUR, LUP, LUN,• ADCE table: PMRG, LMRG, QMRG, MRGS
2. Specific parameters
• BTS table: BSC id, BCF id, SEG id, BTS id, BTS NAME, Cell id, MCC, MNC, LAC, RAC, NCC, BCC, MAL,HSN1, HSN2, MO, MS, CDEF, CDED
• ADCE table: BSC id, BTS id, N-LAC, N-Cell id, N-BCCH, N-NCC, N-BCC, synchronised
• TRX table: BSC id, BTS id, TRX id, FREQ, TSC, TSL configuration
Microsoft Excel
Worksheet
Default, Specific and Sensitive Parameters
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 7/86
7 © 2007 Nokia 13-468259 v1.0
Company Confidential
CM Process
Design default sets
Consistency Checks
Review Neighbour Plan
Review Frequency Plan
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 8/86
8 © 2007 Nokia 13-468259 v1.0
Company Confidential
CM Process - Summary
• Design default sets
• Consistency Checks
1. Compare network design against network configuration
• Default Parameter Check• Specific Parameter Check
2. Database check
• Check inconsistencies between TRX, BTS table with ADCE table:
• Check Adjacencies to non-existing cells
3. Consistency parameter checking
• Neighbour cells with co-BSIC, co-BCCH ...
• Review Neighbour Plan
• Review Frequency Plan
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 9/86
9 © 2007 Nokia 13-468259 v1.0
Company Confidential
Design default sets
• Define default parameter sets - sector template
• Macro 850/900
• Macro 1900/1800
• Micro 850/900
• Micro 1900/1800
• Dense-Urban
• Rural
• Define default neighbour sets – adjacency template• Macro 850 – Macro 850
• Macro 850 – Macro 1900
• Macro 850 – Micro 850 ...
• Sector creation through dat or xml file according to:
• Sector template
• Sector specific parameters
D e f a u l t s e t s c o n s i s t o f
M M L d e f a u l t v a l u e s + r e c o m m e n d e d v a l u e s
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 10/86
10 © 2007 Nokia 13-468259 v1.0
Company Confidential
Consistency Checks
OSS
CM DatabaseCM Database
E x p o r t
Parameter file
Master configurationdatabase
actual default
planned
default
actual specific
NetAct Planner
Planning
database
Parameter file
export
import
I m p o r t
Consistency
check
Parameter file
I m p o r t E x p o
r t
Mapinfo
ODBC
Consistencycheck
Consistency
check
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 11/86
11 © 2007 Nokia 13-468259 v1.0
Company Confidential
CM Process
Compare network design against network configuration
Default Parameter Check
Specific Parameter Check
11 © 2007 Nokia 2. Network Configuration Optimization / 2007-05-31 / Initials
Company Confidential
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 12/86
12 © 2007 Nokia 13-468259 v1.0
Company Confidential
Compare network design against network
configuration
Configuration
analysis
Real system
configuration
Planned systemconfiguration
"What's in the system is not always what we planned to be there"
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 13/86
13 © 2007 Nokia 13-468259 v1.0
Company Confidential
OSS
Operational department
Planning department
Default parameter check
• Databases :
• Responsibilities :
BSC
BSC
BSC
actual default
planned
default
actual specific
Master configuration
database
Consistency
check
N o t e : V e r i f y d e f a u l t s e t t i n g s a r e
O K b e f o r e d o i n g c o n s i s t e n c y
c h e c k i n g i n c a s e p a r a m e t e r
p l a n n i n g w a s d o n e b y o t h e r s ! ! !
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 14/86
14 © 2007 Nokia 13-468259 v1.0
Company Confidential
Default parameter check
• Default parameter checking
• Export Actual Default Parameters from the OSS through a xml file, for e.g.
• Import xml file into a Database using for e.g. CM Plan Editor.
• Compare Planned Default Sets with Actual Default Parameters in the network.• Mark exceptions for each default parameter
• Show differences
• Select changes to be done
• Create dat file or xml file for correction
It is very important to verify if any changes to Default Parameters has
been done before any optimization, as this may result in undesired and
unexpected impacts on the network.
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 15/86
15 © 2007 Nokia 13-468259 v1.0
Company Confidential
OSS
Planning toole.g. NetAct
Operational department
Planning department
Specific parameter check
• Databases :
• Responsibilities :
BSC
BSC
BSC
actual default
planned
default
actual specific
Consistency
check
Master configuration
database
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 16/86
16 © 2007 Nokia 13-468259 v1.0
Company Confidential
Specific parameter check
• Specific sector parameter checking
• Export Actual Specific Parameters from the OSS through a xml file, for e.g. (this
can be done jointly with Default Parameters)
• Import xml file into a Database using for e.g. CM Plan Editor • Import Planned Specific Parameters from NetAct Planner
• Use GSM Cell Id as key
• Compare Planned Specific parameters with Actual Specific parameters from
OSS (mainly LAC, RAC, frequencies, hopping parameters and neighbours)
• Mark exceptions for each default parameter
• Show differences
• Select changes to be done• Create dat file or xml file for correction
It is very important to verify if Specific Parameters have been correctly
implemented before any optimization
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 17/86
17 © 2007 Nokia 13-468259 v1.0
Company Confidential
CM Process
Database check
17 © 2007 Nokia 2. Network Configuration Optimization / 2007-05-31 / Initials
Company Confidential
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 18/86
18 © 2007 Nokia 13-468259 v1.0
Company Confidential
Database check
OSS
BSC
BSC
BSC
•BTS•HOC•POC
•BTS•HOC•POC
•BTS•HOC•POC
ADCE ADCE
ADCE
Consistency
check
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 19/86
19 © 2007 Nokia 13-468259 v1.0
Company Confidential
BSC A BSC B
OSS 1
BSC C
OSS 2
Database check
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 20/86
20 © 2007 Nokia 13-468259 v1.0
Company Confidential
• Database check of Actual Parameters
• Export all Parameters from the OSS through a xml file, for e.g.
• Import xml file into a Database using for e.g. CM Plan Editor.
• Check inconsistencies between TRX, BTS table with ADCE table:• N-BCCH in ADCE table against FREQ in TRX table
• N-LAC, N-NCC, N-BCC in ADCE table against LAC, NCC, BCC in BTS table
• Check Adjacencies to non-existing cells
• Show differences
• Select changes to be done
• Create dat file or xml file for correction
Inconsistencies in tables can generate drop calls during HOs, for e.g.
f AB
Database check
Database check
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 21/86
21 © 2007 Nokia 13-468259 v1.0
Company Confidential
BSC id BTS id TRX id FREQ
f A
BSC id BTS id N-LAC N-Cell id N-BCCH
f AB
TRX
ADCE
N-Neighbour
Cell A Cell B
f AB
f A
applies also to other cell parameters !!
Database checkN-BCCH in ADCE table against FREQ in TRX table
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 22/86
Database check
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 23/86
23 © 2007 Nokia 13-468259 v1.0
Company Confidential
Cell A
Cell C
OMC 1 OMC 2
Cell B
• Cell B is deleted but incoming adjacencieswere not removed
• Cell C is not known in OMC Area 1 database
BSC 2
BSC 1
Database checkAdjacencies to non-existing cells
Database check
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 24/86
24 © 2007 Nokia 13-468259 v1.0
Company Confidential
=============================================================================== ADJ ACENCI ES TO NON- EXI STI NG OR FOREI GN CELLS= Net wor k: PLMN= Ar ea: Al l BTCHs sel ect ed= Sor t i ng key: sour ce BSC name, sour ce BTCH I D===============================================================================Nor mal l y ever y adj acency shoul d be t owar ds an exi st i ng cel l .I n t hi s r epor t al l adj acenci es ar e checked so t hat t he adj acent cel l
( c_bTCH: ci , l ac) r eal l y i s f ound i n t he Noki a Net Act dat abase i n t he c_bTCH t abl e.Di scr epanci es ar e r epor t ed.
I nst r ucti ons:Remove t he i ncor r ect adj acenci es by t he Top- l evel User I nt er f ace af t er compar i ng the repor t t o the pl an.Not e t hat i f t he adj acent cel l exi sTCH i n anot her Noki a Net Act , no cor r ect i on i s needed.Not e: Runni ng t hi s r eport t akes a f ew mi nut es. Pat i ence pl ease.===============================================================================
Adj acenci es t o non- exi st i ng cel l sSour ce Sour ce Sour ce ADJ . CELL ADJ . CELLBSC ( BTCH i d) BCF/ BTCH BTCH i nt _i d LAC CI- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -BSC533( 48) BSC533 118112 22871 1022
Ci d 2413BSC552( 24) 102679 22870 3291BSC553( 1) 97461 22870 3301
BSC553( 2) 97769 22870 3301BSC553( 4) 98375 22870 3301BSC553( 10) 99316 22870 3142
Adjacencies to Non-existing or
Foreign Cells (065) - Example
Database checkAdjacencies to non-existing cells
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 25/86
25 © 2007 Nokia 13-468259 v1.0
Company Confidential
CM Process
Consistency parameter checking
25 © 2007 Nokia 2. Network Configuration Optimization / 2007-05-31 / Initials
Company Confidential
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 26/86
26 © 2007 Nokia 13-468259 v1.0
Company Confidential
• Check cells in MSC vs cells in BSC
• Check external adjacencies in MSC
• Cells with co-channel frequencies
• Cells with adj-channel frequencies• Non symmetrical adjacencies
• Neighbours with co-channel frequencies
• Neighbours with adj-channel frequencies
• Neighbours of a same cell with co-BSIC, co-BCCH
• Check BCCH-BSIC reuse distance
• Check BCCH reuse distance
• Check site with same MA List in different sectors and different HSN
• Check site with same MA List in different sectors and MAIO collision
• Synchronized HO
Consistency parameter checking
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 27/86
27 © 2007 Nokia 13-468259 v1.0
Company Confidential
Cell A Cell B
Cells with co-channel and adj-channel frequencies
FREQ=10 FREQ=9,10,11
• Co-channel frequencies: HO is not possible in case of co-BCCH
• Adj-channel frequencies: Ho is possible but might fail due to interference.
A
B
-6dB -9dB
N t i l dj i
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 28/86
28 © 2007 Nokia 13-468259 v1.0
Company Confidential
Cell A Cell B
Non symmetrical adjacencies
• Find all non symmetrical adjacencies :
• cell B is neighbour of Cell A
• cell A is not neighbour of Cell B
Neighbours with co-channel and adj-channel
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 29/86
29 © 2007 Nokia 13-468259 v1.0
Company Confidential
Neighbours with co channel and adj channel
frequencies or co-BSIC, co-BCCH
Cell A
f=24
Cell B
f=10, BSIC=2,2
f=24f=9,10,11
f=10
• Neighbours with co-BSIC, co-BCCH:
Might generate ghost-access andHO drop calls.
High sdcch abis failure and highhandover failure could be indicators
for this case.
• Neighbours with co-channel or
adjacent channel frequencies:
Will cause interference betweenneighbour cells
Cell C
f=10, BSIC=2,2
Ch k BCCH BSIC d BCCH di t
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 30/86
30 © 2007 Nokia 13-468259 v1.0
Company Confidential
Check BCCH-BSIC and BCCH reuse distance
• Small distances may be dangerous!
Reuse 4/12
FREQ = 234
BSIC = 42
FREQ = 234
BSIC = 42
FREQ = 234
S h i d h d
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 31/86
31 © 2007 Nokia 13-468259 v1.0
Company Confidential
Synchronised handover
Site BSite A
• Non-synchronised Handover
• MS sends access bursts (HO_ACCESS) (with varying TA) until it receives
PHYSICAL_INFO
• Synchronised Handover
• MS sends a few access bursts (HO_ACCESS) and then starts transmission with
previous TA
• Non-synchronised handover leads to a longer communication interruption than
synchronised handover (200ms vs. 100ms)
• Synchronized HO should be activated between sectors of the same site. If activated
on inter-site adjacencies the handover can fail
Synchronized HONon- Synchronized HO
CM Process
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 32/86
32 © 2007 Nokia 13-468259 v1.0
Company Confidential
CM Process
Review Neighbour Plan
32 © 2007 Nokia 2. Network Configuration Optimization / 2007-05-31 / Initials
Company Confidential
Review Neighbour plan
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 33/86
33 © 2007 Nokia 13-468259 v1.0
Company Confidential
Review Neighbour plan
• Neighbour planning• According to best server areas
• Neighbour optimisation adding
• Activate double BA List feature in cells to be integrated/optimised
• Analyse Undefined Adjacent Cell Measurements
• Activate channel finder measurements
• Add neighbour cells appearing with high RxLev and many occurences
• Neighbour optimisation deleting
• Activate handover adjacent cell measurements
• Find pair of cells with low number of attempts incoming and outgoing
• Delete corresponding adjacencies• Remark: number of adjacencies should be optimised (minimised) in order to
facilitate the measurement tasks performed by the handsets
Note: Even when Optimizer is used for automatic Neighbour Optimization, Double BA List and Channel Finder features needto be activated in order to collect measurements from the Network.
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 34/86
Double BA List
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 35/86
35 © 2007 Nokia 13-468259 v1.0
Company Confidential
Double BA List
Parameter Value
bCCHAllocation-ID 1 ... 255
bCCHAllocationList 1 ... 124 in GSM (max. 32 freq. for all bands)
idleStateBCCHAllocation 0 (BCCH list is taken from the adjacent cell)
1 ... 255 (number of the BCCH list used)
measurementBCCHAllocation ADJ (BCCH frequency list taken from adj. cell)IDLE (active MS uses same list as MS in IDLE mode)
initialFrequency 1..124 & 975..1023, 0; 512..885 GSM900;1800 (FREQ TRX)
Undefined Adjacent Cell Measurement
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 36/86
36 © 2007 Nokia 13-468259 v1.0
Company Confidential
Undefined Adjacent Cell Measurement
• Registers statistics on cells, which have not been defined as adjacent cells butwhich are among those six neighbouring cells, that the MS receives best
Source BTS
Defined Adjacencies in source BTS
Among the best measured Adjacencies by the Mobile but not
defined as adjacencies in the SourceBTS. These Adjacencies to bereported in the Undefined AdjacentCell Measurement
Both defined as Adjacencies in thesource BTSand among the 6 bestmeasured Adjacencies in the Mobile.These are the only one to make thehandover to if necessary.
Undefined Adjacent Cell Measurement
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 37/86
37 © 2007 Nokia 13-468259 v1.0
Company Confidential
Undefined Adjacent Cell Measurement
Average strength of the downlink signalreceived from an undefined adjacentcell
Number of samples for calculating the average DLsignal strength
BCCH, NCC, BCC of adjacent cell
Network Doctor 073
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 38/86
Channel finder measurement
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 39/86
39 © 2007 Nokia 13-468259 v1.0
Company Confidential
Measreport
Undefined Adjacent Cell dBm - Serving Cell dBm
(update current counter)
Counter 1
(dBm value below 0)
Counter 2
( 0 < dBm value < 6)
Counter 3
(dBm value >6)
500 5000 2000
Values after 1hour measurementperiod
Dominating Good candidate for a defined cell
3600 sec / 0.48 sec = 7500 samplings during one hour
Channel finder measurement
Decision mechanism
Adjacent cell measurements
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 40/86
40 © 2007 Nokia 13-468259 v1.0
Company Confidential
Adjacent cell measurements
Nbr of HO Attemptsoutgoing and incoming
In case Number of HO Attemptsis very low to a certain cell,consider removing this cell from
Adjacency list.
Network Doctor 153
CM Process
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 41/86
41 © 2007 Nokia 13-468259 v1.0
Company Confidential
CM Process
Review Frequency plan
41 © 2007 Nokia 2. Network Configuration Optimization / 2007-05-31 / Initials
Company Confidential
Review Frequency plan
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 42/86
42 © 2007 Nokia 13-468259 v1.0
Company Confidential
Review Frequency plan
• Optimise BCCH-BSIC reuse in cities ( no repetitions)
• Optimise BCCH reuse
• Implement new frequency plan with Optimizer using existing band splitting
strategy• Implement new frequency plan with Optimizer using existing band strategy
• Simulate new band strategies in simulation tool (1/1, 1/3, 3/3, heuristic RF
hopping with different number of frequencies)
• Implement the strategy that gives the best simulation result
Review Frequency plan
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 43/86
43 © 2007 Nokia 13-468259 v1.0
Company Confidential
BCCH-850
0
10
20
30
40
50
60
70
80
90
1 28 1 29 1 30 1 31 1 32 1 33 1 34 1 35 1 36 1 37 1 38 1 39 1 40 1 41 1 42 1 43 1 44 1 45 1 46 1 47 1 48 1 50 1 51 1 52 1 53 1 56 1 57
BCCH 850
#
q y p
BCCH-BSIC 850
0
2
4
6
8
10
12
14
16
18
20
1 2 8 - 0 0
1 2 8 - 4 7
1 2 9 - 1 6
1 2 9 - 6 3
1 3 0 - 3 2
1 3 1 - 0 1
1 3 1 - 4 8
1 3 2 - 1 7
1 3 2 - 6 4
1 3 3 - 3 3
1 3 4 - 0 2
1 3 4 - 4 9
1 3 5 - 1 8
1 3 5 - 6 5
1 3 6 - 3 4
1 3 7 - 0 3
1 3 7 - 5 0
1 3 8 - 1 9
1 3 8 - 6 6
1 3 9 - 3 5
1 4 0 - 0 4
1 4 0 - 5 1
1 4 1 - 2 0
1 4 1 - 6 7
1 4 2 - 3 6
1 4 3 - 0 5
1 4 3 - 5 2
1 4 4 - 2 1
1 4 4 - 6 8
1 4 5 - 3 7
1 4 6 - 0 6
1 4 6 - 5 3
1 4 7 - 2 2
1 4 7 - 6 9
1 4 8 - 3 8
1 5 0 - 0 7
1 5 0 - 5 4
1 5 1 - 2 3
1 5 1 - 7 0
1 5 2 - 3 9
1 5 3 - 0 8
1 5 3 - 5 5
1 5 6 - 2 4
1 5 6 - 7 1
1 5 7 - 4 0
BCCH-BSIC
#
Optimize BCCH-BSIC reuse in
cities (no repetitions)
Optimize BCCH reuse
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 44/86
44 © 2007 Nokia 13-468259 v1.0
Company Confidential
CM Examples
Examples of wrong parameter set with impact on network
operation/performance
Examples of wrong parameter set with impact onnetwork operation/performance – call setup qual
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 45/86
45 © 2007 Nokia 13-468259 v1.0
Company Confidential
network operation/performance call setup, qual,
bands1. No calls happening in a cell
• Cell Barred
• Non existent (LAC, Cell ID) in MSC
• DMAX = 0
2. Very few calls happening in a cell
• RxLevAccesMin
• Wrong MNC, MCC, LAC declaration
3. Very low traffic in a cell
• msTxPwrMax = 0, bsTxPwrMax = 30
4. Bad quality in UL after rehoming
5. Few traffic in 1800 layer of a dual band 900/1800 network
Example 1a
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 46/86
46 © 2007 Nokia 13-468259 v1.0
Company Confidential
p
9
8
Handover
Call Setup
S Y S I N F O
3 ( B C C H )
( C e l l B a
r r A c c e s s = y e s )
• No calls happening in a cell:The cell has been barred
Example 1b
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 47/86
47 © 2007 Nokia 13-468259 v1.0
Company ConfidentialMSC does not find
(LAC, CI) in its
database
• No calls happening in a cell:
CI different between MSC and BSC or non existent (LAC, Cell ID) in MSC
Example 1c
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 48/86
48 © 2007 Nokia 13-468259 v1.0
Company Confidential
• No calls happening in a cell:MsMaxDistanceInCallSetup (DMAX) = 0
DMAX = 0
RxLevel =-70 dBm
8
Call Setup
Despite the coverageof the cell, no calls will
be established!
Example 2a
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 49/86
49 © 2007 Nokia 13-468259 v1.0
Company Confidential
• Very few calls happening in a cell:
RxLevAccesMin
Cell coverage
RxLevAccessMin = -47 dBm
Mapping OSS database BSS MML
Lowest range 0 -110 dBm
1 -109 dBm
... ...
62 -48 dBm
Highest range 63 -47 dBm
Be careful when setting
parameter through xml or datfile! OSS database unit should
be used to specify parameter
value!
Example 2b
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 50/86
50 © 2007 Nokia 13-468259 v1.0
Company Confidential
• Very few calls happening in a cell:Wrong MNC, MCC, LAC declaration in network - MNC: 01 ≠ 1 !!! (In OSS correct
value)
Example 3
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 51/86
51 © 2007 Nokia 13-468259 v1.0
Company Confidential
bsTxPwrMax 0 … 30 dB 0 dB
bsTxPwrMin 0 … 30 dB 30 dB
minMsTxPower 0 … 36 dBm 0 dB
msTxPwrMax 0 … 36 dBm
Parameter Value_______Default
value
BTS Max Power = BTS Power – (bsTxPwrMax = 0 dB)
BTS Min Power = BTS Power – (bsTxPwrMin = 30 dB)
Attenuation Values (dB)
Power Values (dBm)
MS Max Power = (msTxPwrMax = 33 dB)
MS Min Power = (minMsTxPower = 13 dB)
A b s o l u t
e
∆ D e l t a
• Very low traffic in a cell:msTxPwrMax = 0, bsTxPwrMax = 30
Example 4
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 52/86
52 © 2007 Nokia 13-468259 v1.0
Company Confidential
• Bad quality in UL after rehoming:DiversityUsed parameter not set to yes anymore
RDIV = Y
Uplink Diversityimproves quality of
signal received.
After rehoming
RDIV
parameter wasset to default
value (No) and
UL quality was
affected.
Example 5
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 53/86
53 © 2007 Nokia 13-468259 v1.0
Company Confidential
• Few traffic in 1800 layer of a dual band 900/1800 network:Idle Mode: C2 parameters not set properly (temporaryOffset, penaltyTime)
BCCHBCCH
fast moving mobileslow moving mobile
1800: micro-Layer 900: macro-layer
Examples of wrong parameter set with impact on
network operation/performance upgrade
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 54/86
54 © 2007 Nokia 13-468259 v1.0
Company Confidential
network operation/performance – upgrade
1. High drop call rate after upgrading a cell from 4 to 6 TRXs
• Update MAL, no update of MAIO offset
• TRXs with different power without ICE activated
Example 1a
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 55/86
55 © 2007 Nokia 13-468259 v1.0
Company Confidential
• High drop call rate after upgrading a cell from 4 to 6 TRXs:Update of the MAL with no update of the MAIO offset
Example 1b
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 56/86
56 © 2007 Nokia 13-468259 v1.0
Company Confidential
• High drop call rate after upgrading a cell from 4 to 6 TRXs:TRXs with different power without ICE activated
Coverage
BCCH - TRX
Capacity
MS in a region covered only by Coverage-TRX, ICE not activated.
Result: BTS may allocate a TSL in Capacity TRX. Call will drop.
Traffic - TRX
Example 1b
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 57/86
57 © 2007 Nokia 13-468259 v1.0
Company Confidential
• TRXs with different power
Dual Duplex UnitTRX RF Units
Antennas
TX
RXmaindiv
WBC
Receive Multicouplers& Wideband Combiners
TX/RX ant TX/RX-div
ant
XX
X
XX
X
TX
RXmaindiv
TX
RXmaindiv
TX
RXmaindiv
TX
RXmaindiv
TX
RX maindiv
WBC
D u pl ex er LNA
D u pl ex e
r LNA
D u
pl ex er LNA
D u pl ex er LNA
+3dB
Examples of wrong parameter set with impact on
network operation/performance – frequencies
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 58/86
58 © 2007 Nokia 13-468259 v1.0
Company Confidential
network operation/performance frequencies
1. Drop call rate increase after new frequency plan implementation
• Double BA List activated
2. Impossibility to unlock some BTS after a RF-frequency hopping
implementation
3. Impossibility to unlock some BTS after a frequency retune
• NON-EDGE TRX, with GTRX = Y
• TRX, with GTRX = Y, not attached to any EDAP pool
4. No handover happening after frequency retune between 2 cells from
different BSCs
• ADCE table has not been updated for other BSC
Example 1
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 59/86
59 © 2007 Nokia 13-468259 v1.0
Company Confidential
• Drop call rate increase after new frequency plan implementation:In the meantime, measurementBcchAllocation has been changed to idle and MA list
defined with old BCCH frequency band
BCCH TCH OLD FREQUENCY PLAN
BCCH TCH NEW FREQUENCY PLANTCH
OLD MA List
These BCCH frequencies will not be measured by old MA List
These TCH frequencies will be wrongly measured
Example 2
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 60/86
60 © 2007 Nokia 13-468259 v1.0
Company Confidential
• Impossibility to unlock some BTS after a RF-frequency hopping implementation: After frequency hopping retune, some BCCH frequency equal to TRX frequency
of non-BCCH TRXs
After changing TRX frequency, verify BSIC and TSC (Training Sequence Code)
is changed accordingly.
Example 3a
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 61/86
61 © 2007 Nokia 13-468259 v1.0
Company Confidential
• Impossibility to unlock some BTS after a frequency retune:NON-EDGE TRX, with GTRX = Y, in a cell with EGENA set to yes
B
BTS
NON-EDGETRX(s)
(E)GPRS territory
EGENA = Y
SEG
GTRX = Y
EDGE TRX(s)
BTS
NON-EDGETRX(s)
EGENA = Y
SEG
GTRX = N
EDGE TRX(s)
B
(E)GPRS territory
GTRX = Y GTRX = Y
Example 3b
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 62/86
62 © 2007 Nokia 13-468259 v1.0
Company Confidential
• Impossibility to unlock some BTS after a frequency retune:TRX, with GTRX = Y, not attached to any EDAP pool in a cell with EGENA set
to yes
BTS
NON-EDGE
TRX(s)
EGENA = Y
SEG
GTRX = N
EDGE TRX(s)B(E)GPRS territory
GTRX = Y
EDAP pool
1
2
Add TRX-1 to EDAP pool
Example 4
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 63/86
63 © 2007 Nokia 13-468259 v1.0
Company Confidential
• No handover happening after frequency retune between 2 cells from differentBSCs:
Frequency retune has been done with MML command. ADCE table has not been
updated for incoming adjacencies belonging to other BSCs
BSC id BTS id TRX id FREQ
f A
BSC id BTS id N-LAC N-Cell id N-BCCH
f AB
TRX
ADCE
N-Neighbour
Cell A Cell B
f AB
f A
Examples of wrong parameter set with impact on
network operation/performance – Handover
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 64/86
64 © 2007 Nokia 13-468259 v1.0
Company Confidential
p p
1. No handover from a cell towards all its neighbours• PLMN permitted = No
2. High Handover failures after implementation of new adjacency plan
• SYNC = YES
3. No handover happening from an interfered cell
• hoMarginQual set to 0
4. 100% of handover failures in an adjacency relation
• Co-BSIC co-BCCH declaration
5. High number of handovers
• hoThresholdsLevUL = hoThresholdsLevDL
6. Handover not happening when DL signal level of neighbour much greater thanserving cell
• POC DL activated
Example 1
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 65/86
65 © 2007 Nokia 13-468259 v1.0
Company Confidential
• No handover from a cell towards all its neighbours:PLMN permitted not set properly. MML Default value is the NCC of the BTS. So HOs will
not happen towards neighbours with different NCC.
Cell ANCC 3
Cell BNCC 4
Plmn permitted 0 = No
….
Plmn permitted 3 = Yes
Plmn permitted 4 = No…
Plmn permitted 7 = No
Set Plmn permitted 4 = Yes
PLMN permitted parameter consists actually of 8 parameters (0 …7) related to the NCCpart of the BSICs of neighbour cells. MS only reports measurements of cells with NCCpermitted (plmn permitted = YES).
No Measurement reports of CellB are sent to BSC. So no HOs
occur from Cell A to Cell B
Example 2
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 66/86
66 © 2007 Nokia 13-468259 v1.0
Company Confidential
• High Handover failures after implementation of new adjacency plan All adjacencies have been implemented with synchronised parameter set
to yes. HOs between cells of different sites will probably fail.
SYNC = YE
SYNC = NONew Channel, New Cell
ACTIVE CALL
HANDO CMD
HANDO ACC
HANDO COM
ACTIVE CALL
MS NETWORK
Old Channel, Old Cell
PHYS INFOx
Synchronized Handover Set SYNC = YES
only between
sectors of the
same site.
Recommendation is to have Sync HO within BTSs in the
same BCF and Non Sync HO between BTSs in differentBCFs.
Example 3
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 67/86
67 © 2007 Nokia 13-468259 v1.0
Company Confidential
• No handover happening from an interfered cellhoMarginQual set to 0
• In an interfered cell, despite high signal strength, quality is not good. So HO Margin Qual
should permit HO to a cell that despite it’s lower signal strength, may have a better quality.
A
B
PBGT margin = 6dBHo Margin Qual = -4
Ho Margin Qual = 0
(MML Default)
Example 4
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 68/86
68 © 2007 Nokia 13-468259 v1.0
Company Confidential
• 100% of handover failures in an adjacency relationCo-BSIC co-BCCH declaration
Cell A Cell B
FREQ=10BSIC = 33
FREQ=10BSIC = 33
8
Example 5
Hi h b f h d h Th h ld L UL h Th h ld L DL
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 69/86
69 © 2007 Nokia 13-468259 v1.0
Company Confidential
0
1
2
3
4
5
6
7
- 1 1 0
- 1 0 8
- 1 0 6
- 1 0 4
- 1 0 2
- 1 0 0
- 9 8
- 9 6
- 9 4
- 9 2
- 9 0
- 8 8
- 8 6
- 8 4
- 8 2
- 8 0
- 7 8
- 7 6
- 7 4
- 7 2
- 7 0
- 6 8
- 6 6
- 6 4
- 6 2
- 6 0
- 5 8
- 5 6
- 5 4
- 5 2
- 5 0
dBmdBm
QualityQuality
HoThresholdLevUL/DL
HoThresholdInterferenceUL/DL
Interference HoInterference Ho
No Action NeededNo Action Needed
Quality HoQuality Ho
Level HoLevel Ho
HoThresholdLevDLHoThresholdLevUL
• High number of handovers. hoThresholdsLevUL = hoThresholdsLevDL
hoThresholdsLevUL,
high thresholds will
anticipate HOs:
-95 -> -100
hoThresholdsLevDL:
-95 -> -90
Example 6
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 70/86
70 © 2007 Nokia 13-468259 v1.0
Company Confidential
• Handover not happening when DL signal level of neighbour much greater thanserving cell
Power control DL activated
A
B
-6dB
-3dB
Power Control
-9dB
Examples of wrong parameter set with impact on
network operation/performance – Background Plan
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 71/86
71 © 2007 Nokia 13-468259 v1.0
Company Confidential
OSS
BSC
BSC
BSC
Plan
8
8
Background Loading of
Radio Network Plan
Examples of wrong parameter set with impact on
network operation/performance – Background Plan
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 72/86
72 © 2007 Nokia 13-468259 v1.0
Company Confidential
1. Few handovers after implementation of new adjacency plan
• Only half of the plan has been downloaded. Half of the adjacencies missing.
2. High drop call rate in some sites after frequency hopping activation• Some sites did not hop as some frequencies were not correctly set!
Important to verify network parameters through MML command!
In case not all parameters were changed correctly, use MML to
implement the changes!
Examples of wrong parameter set with impact onnetwork operation/performance – PRFILE, MSC,
SGSN
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 73/86
73 © 2007 Nokia 13-468259 v1.0
Company Confidential
BTS BSC
MSC
SGSN GGSN Internet
PSTN
GPRSBackboneIP Network
GPRS Core
PARAMETERS
PRFILE+
PARAMETERS
PARAMETERS
SGS
Examples of wrong parameter set with impact onnetwork operation/performance – PRFILE, MSC,
SGSN
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 74/86
74 © 2007 Nokia 13-468259 v1.0
Company Confidential
1. No queuing happening after activating it with BTS parameters.
• Queuing should be activated also in BSC PRFILE (PREEMPT_USAGE parameter set
to FF) and in MSC!
2. No rejection due to distance when activating the parameter
msMaxDistanceInCallSetup.
• The parameter DISTANCE_VERIFYING should be set to FF in BSC PRFILE
3. Tremendous amount of GPRS attaches.
• The detach timer set to 01h00 in the SGSN! Verify parameters in SGSN related to
implicit detach.
4. Mal functioning MS and Bad RxQual DL.
• DL DTX is activated in BSC level and by MSC parameters in cell level. It is not
recommended to activate DL DTX, specially when BB Hopping is being used.
Examples of wrong parameter set with impact on
network operation/performance – PRFILE, MSC, SGSN
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 75/86
75 © 2007 Nokia 13-468259 v1.0
Company Confidential
5. Paging request decrease after msPeriodicLocationUpdate settingDEREGISTRATION TIMER < msPeriodicLocationUpdate!
Verify the parameters in BSC and MSC are correctly set.
E.g. of values
BSC: msPeriodicLocationUpdate (BTS) 4-6hrsMSC: Implicit IMSI Detach Time Limit (VLR) 12 hrs
Loitering time (VLR) 24hrs
Examples of wrong parameter set with impact on
network operation/performance – BSC
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 76/86
76 © 2007 Nokia 13-468259 v1.0
Company Confidential
6. Tremendous amount of Location updatemsPeriodicLocationUpdate = 30 minutes
Too many
Location Updates
will causeSDCCH
congestion!
Conclusion
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 77/86
77 © 2007 Nokia 13-468259 v1.0
Company Confidential
• Do consistency checks: verify network parameters are as planned.
• Check configuration!
• Verify differences between OSS template and BSC default parameters!• In some cases recommended values should be used instead of default values (e.g.
msPeriodicLocationUpdate: 0.5 -> 6)
• Verify value of sensitive parameters (e.g. DMAX, RxLevAccessMin)
• Adjust parameters to balance traffic (e.g. C2 in idle mode)
• Inter-related parameters (e.g. New Frequency Plan + BA List)
• Activate parameters in PRFILE, MSC and SGSN (e.g. queuing)
• When downloading background database, verify parameters through MML command(e.g. new frequency plan)
Before suspecting anything, check the parameters active in the network!!!
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 78/86
78 © 2007 Nokia 13-468259 v1.0
Company Confidential
CM Tools (Optional)
Nokia NetActTM
Planner Nokia NetActTM Optimizer
RAC Tools
PLANNING & ROLLOUT OPTIMIZATIONOPERATIONS NetActSQM
Nokia NetAct™
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 79/86
79 © 2007 Nokia 13-468259 v1.0
Company Confidential
NetActMultiRadio
Planner
NetActOptimal Planner
NetActTransmission
Planner
NetActOptimal Planner
NetActOptimizer
NetActService Optimizer
NetActRAC
FieldMeasurements C
MD
B
NetActMonitor (FM)
NetActInspector
NetActReporter
NetActTraffica
F M
C D R
P a s s i v e P M
A c t i v e P M
P
MDB
Nokia NetActTM Planner
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 80/86
80 © 2007 Nokia 13-468259 v1.0
Company Confidential
• MultiRadio Planner
• Support GSM, GPRS, WCDMA Technology
• 2G-2.5G Radio network planning
• General Planning Support : coverage, capacity and frequency planning
• Microcellular network planning
• Dual-band planning• Frequency Hopping planning
• Data service planning
• AMR and HR support
• 3G Radio network planning
• Monte Carlo simulations
Nokia NetActTM Optimizer
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 81/86
81 © 2007 Nokia 13-468259 v1.0
Company Confidential
• Perform Frequency allocation
• BCCH and TCH allocation
• RF Hopping allocation: MA-lists MAIOparameters, HSN
• Other necessary parameters: TSC,
BSIC, all IDs
• Perform adjacency optimisation
• Automated adjacency creation based on measurements
• Automated adjacency deletion based on KPIs
RAC Tools - CM Plan Manager
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 82/86
82 © 2007 Nokia 13-468259 v1.0
Company Confidential
CM
Analyser
Radio Access Configurator Application Layer
CM
Provisioner
CM
Editor
CM Plan
Manager
Provided functionality:
• Plan import / export (XML file format)• Actual network data export
• Plan identification and browsing
• User-defined plan status visualization and control
• Plan deletion
RAC Tools - CM Editor
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 83/86
83 © 2007 Nokia 13-468259 v1.0
Company Confidential
CM
Analyser
Radio Access Configurator Application Layer
CM
Provisioner
CM
Editor
CM Plan
Manager
Provided functionality:
• Plan creation
• Plan content browsing
• Actual data visualization
• User configurable parameter views
• Parameter mass modification
• Template management
• Integrated GSM and 3G object/parameter editing
RAC Tools - CM Analyser
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 84/86
84 © 2007 Nokia 13-468259 v1.0
Company Confidential
CM
Analyser
Radio Access Configurator Application Layer
CM
Provisioner
CM
Editor
CM Plan
Manager
Provided functionality:
• Predefined rules for consistency checks
• Rule result status information
• Defined action property in rules - automated correction, automated
inconsistency reporting
• Integration with other Radio Access Configurator functionality• Support of simultaneous consistency check operations
RAC Tools - CM Provisioner
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 85/86
85 © 2007 Nokia 13-468259 v1.0
Company Confidential
CM
Analyser
Radio Access Configurator Application Layer
CM
Provisioner
CM
Editor
CM Plan
Manager
Provided functionality:
•User Requested / Scheduled Plan download to network
•Maintaining the timestamp and originator of the last download
•Download progress tracking and status feedback
•Support of simultaneous download operations• Access control and authorization
7/27/2019 Network Configuration Optimization
http://slidepdf.com/reader/full/network-configuration-optimization 86/86
86 © 2007 Nokia 13-468259 v1.0
Company Confidential
Thank you!
RANOP / 2007