Features for Optimization RN2022-14N RANOP – Radio Network Optimization Principles Features for...

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Features for Optimization

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1 © Nokia Siemens Networks RN20225EN14GLN0

RN2022-14NRANOP – Radio Network Optimization Principles


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Objectives

At the end of the this chapter participants will be able to

• know which features can be used in optimization process

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Contents of RANOP

• Introduction to optimization– What is network optimization– What should be taken into account when starting Network

Optimization?

• Assessment– Situation at the moment

• KPIs and Measurements– Measurement tables + KPIs

•Solution findings (optimization) and verification– Maximum gain in limited time– Bottlenecks

• Features to be consideredFeatures to be considered–– NSN recommended features to be used in optimizationNSN recommended features to be used in optimization

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Features to be considered– table of contents

•Features to be considered can be divided as follows– Traffic handling

– Interference handling

– (E)GPRS Features

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Features to be consideredTraffic handling

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Features to be considered -Traffic handling

• Traffic handling is needed when traffic handling based on strongest signal = based on dominance areas is not working good enough

• Traffic can be handled for example with following features– Umbrella

– CBCCH (Common BCCH)

– Traffic reason HO

– DFCA

– DADL/B (Direct Access to Desired Layer/Band )

– Soft channel capacity

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Features to be considered -Traffic handlingCommon BCCH• Combine signaling channels• Combine traffic channels, improve trunking gain• Tighter reuse of non-BCCH frequency band• Quality improvement due to decreased number of handovers

GSM 1800, TCH

GSM 900, TCH

GSM 900

BCCH, SDCCH

CBCCH ExampleBTS 1, 900 layer, BCCH frequency bandBTS 2, 1800 layer, non BCCH frequency band

Traffic can be pushed to other layer based on

Load

Signal level

PBGT

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Features to be considered -Traffic handlingCommon BCCH

BTS specific parameters

GSM 1800

BCCH

GSM 1800

GSM 900

BCF BCF

BTS BTS

SE

GM

EN

T

Segment specific parameters

BTS specific parameters

GSM 900

BCCH

GSM 900

GSM 1800

BCF BCF

BTS BTS

SE

GM

EN

T

Segment specific parameters

• Common segment specific parameters

• BTS specific parameters

Existing BTS parameters are divided into

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Features to be considered -Traffic handlingUmbrella between 2 cells

HO areacellA

cellB

When the signal is better than the umbrella threshold

(for example AUCL= -80dB) => Traffic will be pushed to other cell

HOs back to cellA• PBGT (should be adjusted higher)

• Level

• Quality

cellAcellB

Dominance area is now bigger

Note!These 2 cells can locate also in the same site

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Features to be considered Interference handling

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Features to be considered Interference handling

• Interference handling is needed when

• Interference can be handled with following features– AMR FR / HR ( also capacity feature)

– SAIC/DARP

– DFCA

– Frequency Hopping

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Features to be considered AMR FR / HR

AMR Full Rate (AMR Quality & Coverage)– AMR FR increases Spectral Efficiency (EFL)

– AMR FR increases indoor signal strength

– AMR FR increases the effective cell size

AMR Half Rate (AMR Capacity)– AMR enables the usage of the half-rate more users without a

decrease in the voice quality

4.7512.2

4.757.4

Handover

Handover

Linkadaption

7.95

5.9

AMR Half RateAMR Half Rate

AMR Full RateAMR Full Rate

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Features to be considered SAIC and DARP

SAIC = Single Antenna Interference Cancellation

Generic term for a receiver algorithm in a handset utilising one antenna

Nokia’s phase 1 SAIC is a proprietary algorithm

DARP = Downlink Advanced Receiver Performance

3GPP standardized feature for 2G utilising SAIC and uplink signalling

Introduced in Rel-6 as release independent feature

• Can be introduced to terminals supporting earlier 3GPP releases

Nokia’s phase 2 SAIC is 3GPP compliant DARP feature

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Features to be considered SAIC/DARP

SAIC is digital signal processing technique, which uses the correlation properties of a

GMSK modulated signal to perform an active cancellation of the interfering signals

SAIC is digital signal processing technique, which uses the correlation properties of a

GMSK modulated signal to perform an active cancellation of the interfering signals

In today's network the vast amount of traffic is GMSK modulated

In today's network the vast amount of traffic is GMSK modulated

GMSK modulated interferers SAIC gainGMSK modulated interferers SAIC gain

8-PSK modulated interferer No SAIC gain / No loss8-PSK modulated interferer No SAIC gain / No loss

Gains on both synchronized and non-synchronized networksGains on both synchronized and non-synchronized networks

EDGE (MCS5-9)8-PSK

FR, HR and EFR speechAMR speechGPRSEDGE (MCS1-4)Control channel

GMSK

Modulations:

SAIC does not improve coverageSAIC does not improve coverage

NeighborBTS

fc

ServingBTS

Owncell

Interferers are seen as colored noise, but most L1 algorithms assumes white noise contribuations. So SAIC basically tries to whiten the interfering signals and thereby improving performance of the algorithms.

In Coverage we are limited by own RF noisealready white no gain.

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• Loose interference control

• Relies on random spreading of the interference

• Loose interference control

• Relies on random spreading of the interference

BCCH

Random FH

Random FHover a fixed frequencylist

TRX 1

TRX 2

TRX 3

TRX 4

DFCA

TRX 1

TRX 2

TRX 3

TRX 4

BCCHCyclic FHover individually selectedfrequency lists and MAIOsfor each connection

C/I > C/I target

• Accurate interference control (C/I estimations)

• Each connection is assigned with the most suitableradio channel (MA list, MAIO, TSL)

• Accurate interference control (C/I estimations)

• Each connection is assigned with the most suitableradio channel (MA list, MAIO, TSL)

Features to be considered DFCA – (Dynamic frequency & channel allocation)

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Features to be considered (E)GPRS Features

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Features to be considered (E)GPRS Features

Example of (E)GPRS features– NCCR, NACC

– EDA (Extended Dynamic Allocation)

– HMC (High Multislot Classes)

– Extended cell for (E)GPRS

– Dynamic Scheduling for Ext UL TBF

– PCU pooling

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Features to be considered– (E)GPRS FeaturesNetwork Controlled Cell Reselection (NCCR)

• NCCR (Network Controlled Cell Reselection) enables the network to control the resource allocation when the MS performs the cell reselection.

• NCCR is an optional feature in Nokia BSC. Operator can enable/disable the feature on BSC level.

• Network Control Mode (NCM) defines how cell re-selection is performed:

EDGE

EDGE

GPRS

BTS EDGE

EDGE

BTS

Cell border with default values

Cell border with default values

Packet Transfer Mode• Offset 24 dB when going from EDGE to

GPRS cell

• Offset -12 dB when going from GPRS to EDGE cell

Result: EDGE MS does not enter GPRS cell.

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Features to be considered– (E)GPRS FeaturesNetwork Assisted Cell Change (NACC)

NACC shortens the cell reselection in two ways:

• Sending neighbour cell system information on PACCH to MS in packet transfer mode while it is camped on the serving cell

• By supporting PACKET SI STATUS procedure in a target cell

Cell Reselection DelaysTwo-phase access, Inter-RA, Inter-PCU

Nokia 6230i

0

1

2

3

4

5

6

NC0 NC0 + NACC

Network Control Mode

Tim

e(s

)

Application Outage

Data Outage

Cell Outage

38% drop inoutage times

NC0 = “normal” cell reselection

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Features to be considered– (E)GPRS Features Extended dynamic allocation (EDA)

Peak uplink throughput doubled to 236.8 kbit/s with 4 slots• Without EDA, 1 DL timeslot is needed for

each UL timeslot

• With EDA, 1 DL timeslot can control multiple UL timeslots

With Class 1-12 mobiles, no EDA– Maximum 4+1, 3+2 timeslots DL+UL

With Class 1-12 mobiles and EDA– Maximum 1+4, 2+3 timeslots DL+UL

With High Multislot mobiles and EDA– Maximum 2+4, 3+3 Timeslots DL+UL

0

50

100

150

200

250

300

350

GPRS GPRS CS3/4 EDGEk

bit

/s S11.5

S12

Peak uplinkthroughput

Extended Dynamic allocation increases

GPRS/EDGE peak uplink throughput to 236.8 kbit/s

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0

50

100

150

200

250

300

350

GPRS GPRS CS3/4 EDGE

kb

it/s S11.5

S12

Features to be considered– (E)GPRS Features High multislot classes (HMC)

Supports 3GPP Release 5 High Multislot Mobiles• Multi Slot Class 30 ... 45 Mobiles

• Maximum (Sum = 6): 5+1, 4+2 Timeslots DL+UL

• With Extended Dynamic Allocation also: 2+4, 3+3 Timeslots DL+UL

Increased Downlink data rates

• Improved Video streaming

• Faster Web content browsing

• Faster mail attachment download

Peak downlinkthroughput

High Multislot Classes increases GPRS/EDGE peak downlink throughput to 296

kbit/s

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