ACCESS TRANSMISSION NETWORK UPGRADE IN A NATIONWIDE MOBILE NETWORK MODERNIZATION PROJECT FOR EDGE...

7/30/2019 ACCESS TRANSMISSION NETWORK UPGRADE IN A NATIONWIDE MOBILE NETWORK MODERNIZATION PROJECT FOR EDGE DEPLOYMENT

1/31

Dr.Attila HILT, Pter PETRS

Dean EMSLEY, Grzegorz RYBARCZYK

Nokia Siemens Networks,NPO, Network Planning and Optimization

H-1092 Budapest, Kztelek utca 6. Hungary,

[email protected]

ACCESS TRANSMISSION NETWORK UPGRADE IN ANATIONWIDE MOBILE NETWORK MODERNIZATIONPROJECT FOR EDGE DEPLOYMENT

1 2008 Nokia Siemens Networks - HILT Attila - Budapest , 1-Oct-2008.


2/31

INTRODUCTION

there is a continuous demand for capacity increase :

new sites, new services, deployment ofEDGE, UMTS

microwave access networks become very dense

most of the networks expanded historically not optimal

planning rules were not always kept - planning mistakes

several access networks are tipically 510 years old

modernization & network optimization projects

to meet subscribers expectations

better spectral efficiency reduced frequency fees

to adopt changing regulations, stricter standards

to increase quality and reliability of the network



3/31

UNOFFICIAL INTRODUCTION

no complicated equations

before coffe break please


real life

project

learnings

I tE E

E E tE

t

E Et

Et

P Do p t R F

R F o p t R FR F

R F

R F o p to p t R F

R Fo p t

( ) c o s c o s

c o s ( ) c o s

2 2 2

2

2

2 22

22

22

( ) ( )I k E E kP D R F o u t j o p t j o u t j k o p t j R Fk

N j

j

N( )

, ,*

, ,= +

+

=

=

01


4/31

NETWORK MODERNIZATION & OPTIMIZATION

GSM networks developed originally for voice data was not supported

most of the GSM networks are tipically 515 years old

example ofnationwide modernization of operators GSM network

simultaneous deployment of EDGE (in parallel with UMTS roll-out)

operators goal was to achive a high speed mobile data network

not technology specific (EGDE or UMTS) but service oriented

modernization projects offer the possibility ofnetwork optimization

in RF: high mobile data rates (100120 kbit/s typical), better KPIs

in TRS: massive capacity upgrades meanwhile:

adopting changing regulations, stricter standards, NW assessment, increasing quality and reliability

removing historical constraints/planning mistakes

in RF&TRS: less interference, better spectral efficiency



5/31

GSM Network Architecture EGPRS supports data

GnGGSN

Gb

SGSN

A.bis

MSC (or MSS)BSC

A

Core Network

BTS

BTS

AccessTransmission

Network

Radio Network

EDGE : Enhanced Data Rates for GSM Evolution



6/31

Evolution of Mobile Data Rates : 1997-

UMTS

2002

2003

GPRS

General Packet Radio Service EDGE

Enhanced Data Rates for GSM Evolution

High Speed Circuit Switched Data

Wireless Application Protocol

Universal Mobile Telecommunication Services

Short

Message

Service

SMS

1997

1999

1998~40 kbit/s

48 kbit/s(CS.2)

High Speed Downlink/Uplink

Packet Access

HSUPA

GSM

Evolution

2000WAP, HSCSD 236.8 kbit/s(MCS.9)

HSDPA

3.6 Mbit/s

2007

384 kbit/s

2008



7/31

EDGE Modulation and Throughput

(0,0,1)

(1,0,1)

(0,0,0) (0,1,0)

(0,1,1)

(1,1,1)

(1,1,0)

(1,0,0)

8 PSK

(0,0)

(0,1)

(1,1)

(1,0)

GMSK

236.856Max.user TP/air-4TSL [kbit/s]

59.214User TP/air-TSL [kbit/s]

69.622.8Gross rate/air-TSL [kbit/s]

348114Air IF burst size [bits]

270.833270.833Symbol rate [ksymbol/s]

31Number of bits [bit/symbol]

8-PSKGMSKModulation method

EDGEGPRS



8/31

1.) Software upgrade/activationof existing, EDGE capable TRXs inexisting UltraSites

2.) TRX upgradesin existing UltraSites

(EDGE capable TRXs)

3.) Swap of entire BTS cabinet:Citytalk UltraSite andFlexitalk EDGE capable MetroSite

EDGE upgrade : SW activation or HW swap



9/31

Network Modernization Example : Site Swaps/Upgrades

more than 2000 BTS were swapped and/or upgraded

red dots :

EDGE deloyment

on existingTRS NW (D1)

green squares :

TRS NW upgrade

was necessary

(D2D7)



10/31

Swap/Upgrade of the Base Stations for EDGE

very fast roll-out : 800 Sites in Phase 1, 1200 Sites in Phase 2

Sites swapped

per week

0

10

20

30

40

50

60

70

80

Week No

Sites Swapped 0 1 0 1 2 2 8 11 23 23 22 16 21 13 39 25 38 40 29 42 52 51 71 62 61 58 28 0 0 0 5 13 18 17 20 19 15 20 12 29 32 21 24 29 34 33 42 24 37 35 31 42 45 27 27 15 11 4 10 16 26 37 41 35 37 33 42 41 44 39 39

5/26

5/

2

7

5/

2

8

5/

2

9

5/

3

0

5/

3

1

5/

3

2

5/

3

3

5/

3

4

5/

3

5

5/

3

6

5/

3

7

5/

3

8

5/

3

9

5/

4

0

5/

4

1

5/

4

2

5/

4

3

5/

4

4

5/

4

5

5/

4

6

5/

4

7

5/

4

8

5/

4

9

5/

5

0

5/

5

1

5/

5

2

6/

1

6/

2

6/

3

6/

4

6/

5

6/

6

6/

7

6/

8

6/

9

6/

1

0

6/

1

1

6/

1

2

6/

1

3

6/

1

4

6/

1

5

6/

1

6

6/

1

7

6/

1

8

6/

1

9

6/

2

0

6/

2

1

6/

2

2

6/

2

3

6/

2

4

6/

2

5

6/

2

6

6/

2

7

6/

2

8

6/

2

9

6/

3

0

6/

3

1

6/

3

2

6/

3

3

6/

3

4

6/

3

5

6/

3

6

6/

3

7

6/

3

8

6/

3

9

6/

4

0

6/

4

1

6/

4

2

6/

4

3

6/

4

4

10 2008 Nokia Siemens Networks - HILT Attila - Budapest , 1-Oct-


11/31

Concept of Dynamic A-bis Pool (EDAP)

Two sites of 2+2+2 configurationgroomed into 1 E1

BTS1 ungroomed, space forfuture TRX upgrade, 6 TSL EDAP

BTS2 ungroomed, space forfuture TRX upgrade, 6 TSL EDAP

1 BTS per 1E1, 1 new 2 Mbit/sA-bis channel required

2 BTS sharing1E1 (2Mbit/s)



12/31

D1 : Easy swap site.

Existing TRS capacity is sufficient to activate EDGE after the site is swapped orupgraded. No additional E1 required.

D2 : New 2 Mbit/s path must be patched.

Patching means remote electrical or local physical cross connections via cables

on sites. Existing physical TRS capacity is sufficient, but the entire 2Mbit/s pathmust be estabilished and checked between BSC and BTS (A-bis) before EDGE

activation. Typical example is un-grooming of sites, where sites sharing the

same E1, but there is no available A-bis TSL for EDAP (EDGE Dynamic A-bis Pool)

D3 : SDH upgrade is required.

A-bis path contains SDH section, where 2 Mbit/s upgrade is needed for the BTS.SDH upgrade require activation of existing physical interfaces or insertion of

new cards may be required

D4 : MW link must be swapped or upgraded.

D5 : Leased Line upgrade required.

D6 : BSC problem :

No more free ET card available in actual BSC, PCU full-up,

frozen BSC : BSC rehoming or BSC SW upgrade.

D7 : Core NW upgrade is required

E.g. SGSN, or Gb interface capacity upgrade.

Classification of possible problems in EDGE upgrade of sites



13/31

Statistics of TRS problems/upgrades required for EDGE


0

100

200

300

400

500

D2

patching

D3

SDH

D4

MW

D5

LL

D6

BSC

21.3

%

13.3

%

10.9

%

2.4% 3.5%

TRS problems Total % of sites

D1 1486 74.2%

D2 427 21.3%

D3 267 13.3%

D4 219 10.9%D5 48 2.4%

D6 70 3.5%

No of problems 2517 125.7%


14/31

Statistics of TRS problem sites

Conclusions : Number of sites are not equal with the number of TRS problems.

One single site may suffer several TRS problems

Solution of a single TRS problem can solve the TRS problem

of several sites


TRS problem Sites

D2 81 4.0%

D2D3 110 5.5%

D2D3D4 97 4.8%D2D3D4D6 7 0.3%D2D3D5 22 1.1%

D2D3D6 30 1.5%D2D4 26 1.3%

D2D4D6 7 0.3%D2D5 25 1.2%D2D5D6 1 0.0%D2D6

26 1.3%D4 84 4.2%

TRS Problem sites 516 25.8%

Sites without TRS problem 1486 74.2%Total 2002 100%

Total

0

50

100

150

D2

D2D3

D2D3D4

D2D3D

4D6

D2D3D5

D2D3D6 D

2D4

D2D

4D6 D2D5

D2D5D6 D

2D6 D4


15/31

Network Modernization Example : Topology, MW links (D4)



16/31

Modernization of MW Access Networks

Nokia Radio Type

Capacity 8x2 16x2 8x2 16x2 8x2 16x2 Mbit/s

Bandwidth 7 14 14 28 14 28 MHz

Pout (nominal TX power) 18 18 18 18 17 17 dBm

VHP2-220A (60 cm) antenna 40.1 40.1 dBi

VHLP2-220 (60 cm) antenna 40.1 40.1 dBi

VHLP2-23 (60 cm) antenna 40.4 40.4 dBi

BER=10-3 threshold, guaranteed -82 -79 -86 -83 -79 -76 dBm

BER=10-6 threshold, guaranteed -79 -76 -83 -80 -75 -72 dBmSystem Gain, (BER=10-3) 100 97 104 101 96 93 dB

System Gain, (BER=10-6) 97 94 101 98 92 89 dB

System & 2xAnt.Gain, (BER=10-3) 180.8 177.8 184.2 181.2 176.2 173.2 dB

System & 2xAnt.Gain, (BER=10-6) 177.8 174.8 181.2 178.2 172.2 169.2 dB

Gain increase compared to DH 4.6 4.6 8 8 0 0 dB

Gain increase compared to DH 5.6 5.6 9 9 0 0 dB

FlexiHopperPlus FlexiHopper DynaHopper

increased

system gain

23 GHz example :

better

antenna gain

double capacity in

same bandwidth



17/31

Basic Rules of Dense MW Access NW Design

set transmit power

as low as possible

proper use of

frequency bands

use high gainantennas

select proper

link polarization

avoid High-Low

conflict on sites

use high qualityMW radios

balance Received SignalLevels at sites

monitor

the results

30

70



18/31

Polarization and Distance Rule

Distance(km) 0.15 1 3 5 6 7.5 10 12 15

Vertical

Horizontal Vertical

Horizontal Vertical

Horizontal Vertical

23 GHz

13 GHz

52 or 58 GHz

38 GHz

always select the proper frequency band :

long links lower frequency bands (e.g. 13 or 15 GHz),

short links as high frequencies as possible (23, 26, 38 or 58 GHz).

in several countries there are local regulations forcing all network

operators for efficient band selection.

Swiss regulation is shown as an example:



19/31

ETSI defines RF channel raster and duplex distance in each frequency band.

(In some bands e.g. 15 GHz more duplex distances are standardized.)

1A 2A 3A 4A 5A 6A 7A 1B 2B 3B 4B 5B 6B 7B

Duplex (go-return) distance

f

Low sub-band High sub-band

Tx=4A

Tx=4B

L (Low TX)

H (High TX)

Rx=4BRx=4A

High and Low TX Radios



20/31

H

H

H L

L

near interference

should be avoided

H

HL

L

new freq. band

e.g. 32 or 38 GHz

new link must be added :

Solution 1 :add one more site into the loop

Solution 2 :introduce new frequency band

H

H

L

Avoiding High - Low Conflicts (near field interference)

H L

H

H L

L

High / Low TX channel allocation,all links are in the same band

e.g. 23 GHz



21/31

only high

output power

high and low

output power

Preferably try to use low output power

but high gain antennas, if possible.

Setting Transmit Power Properly

LLH

L

high output

power

low output

power

low outputpower

H

LLH

L

high output

power

low output

power

low outputpower

H

L

L

H

LH

high output

power high output

power

high output

power

interferencepath

L

L

H

LH

high output

power high output

power

high output

power

interferencepath

LLH

L

high output

power

low output

power

low outputpower

H

LLH

L

high output

power

low output

power

low outputpower

H

L

L

H

LH

high output

power high output

power

high output

power

interferencepath

L

L

H

LH

high output

power high output

power

high output

power

interferencepath

L

L

H

LH

high output

power high output

power

high output

power

interferencepath

L

L

H

LH

high output

power high output

power

high output

power

interferencepath



22/31

Selecting High Gain and High Performance Antennae

high performance antennahas better gain in main direction

and smaller sidelobes in

unwanted directions

StandardHigh

Performance

5-15 dB

Interfered site

Standard antenna

Un-interfered site

High Performance antenna



23/31

OSS Monitoring of the Link Parameters

PoutRSL

frequency

modulation mode

2Mbit/s cross

connections

IDU configuration



24/31

Roll-Out Speed of Access Network Modernization

links

planned

links

swapped

or

upgraded

links

frequency

licenced

links

to beswapped

or

upgraded

MW Link Swaps, Upgrades & New Links

1.

Sep.

29.

Sep.

27.

Oct.

2005

24.

Nov.

22.

Dec.

19.

Jan.

2006

16.

Feb.

16.

Mar.

13.

Apr.

11.

May.

2006

8.

Jun.

6. 3.

Aug.

31.

Aug.

2006

28.

Sep.

26.

Oct.

23.

Nov.

2006

Jul.

PLANNED MW LINKS

FREQUENCY APPROVED LINKS

IMPLEMENTED MW LINKS

LINKS TO BE BUILT / SWAPPED

PLANNED MW LINKS




PLANNED MW LINKS




Numberofmicrowave

links

0

100

200

300

400

500

0

100

200

300

400

500

1. 29.



25/31

Topology of Repeater VS803

Optimized for AccessCapacity Increase



26/31

Repeater Optimization for Access Capacity IncreaseOllon Chavalon Chavalon VD954 Territet Chavalon Gion Chavalon La Chiesaz Chavalon Sully Chavalon Legier Chavalon Corseaux Chavalon Pelerin Chavalon Mollie Margo Chavalon

VD431 VS803 VS803 VD954 VD422 VS803 VD454 VS803 VD406 VS803 VD417 VS803 VD411 VS803 VD881 VS803 VD804 VS803 VD801 VS803

H:12 12912/13178V:13 12926/1319223429

53 22375.523383.5

Link 9 Link 10Link 5 Link 6 Link 7 Link 8

14.7 17.25 26.08

Site name

Site ID

Link number Link 1 Link 2 Link 3 Link 4

new fr. band 23 GHz 23 GHz 23 GHz 23 GHz 23 GHz 23 GHz

Vertical

FHP

FHPFH FHP FH

23 GHz

23 GHz 23 GHz 23 GHz 23 GHzold fr. band 23 GHz 23 GHz 23 GHz

yes yes yes no

16x2 16x2 16x2

Interference yes no no yes yes yes

4x2 4x2 4x2 8x2old capacity 4x2 4x2 4x2

Vertical Vertical VerticalVertical Vertical Vertical Vertical

FH FH FHFH FH DH FH

O

LD

old radio FH DH

old polarization Vertical Vertical

FHP X-polar FHP

Horizontal X-polar Vertical23 GHz 13 GHz 13 GHz

new radio FH FHP FH

Horizontal Vertical Horizontal Verticalnew polarization Vertical Horizontal Vertical

16x2

new channel [MHz] 1112898

1316423404.5

22375.5

23383.530

22421

new capacity 4x2 8x2 4x2 4x2 8x2 4x2 8x2

no

old channel [MHz]

interference

22431.5

23439.564

22452.5

23460.556

22396.5

no no nono no no

hop length [km] 11.03 9.4 9.11 11.33 14.49

NEW

11.29

22382.5

23390.557

22403.5

23411.561

13.25

23 GHz 23 GHz

no no no

16x2 32x2

53

FHP

13

52 22368.523376.5 57 22403.5 65 22459.523411.5 23467.5 49 22347.523355.5 59 22417.5 66 22466.523425.5 23474.5 14 22386 16 22442 6 1290523394 23450 13171

5922417.5

23425.554

links marked with yellow had interference (all links were Vertical)

some links were out of channel range preferred by Authority several links arriving to the repeater in a narrow angle

by systematic order of swapping link polarizations betweenHorizontal and Vertical (H, V, H, V, ) and by swapping out 5 links :

access capacity increased from 80x2 Mbit/s up to 104x2 Mbit/s26 2008 Nokia Siemens Networks - HILT Attila - Budapest , 1-Oct-2008.


27/31

How shouldnt we plan microwave links ?

Strong wind may influencethe network quality

e.g. by changing polarization

from vertical to horizontal



28/31

Sometimes the problem

may arise when the

wind does not blow

How shouldnt we plan microwave links ?



29/31

Try to keep the first Fresnel zone clear

The link was implemented firstbuilding reconstruction came later



30/31

CONCLUSION

several GSM networks are typically 515 years old

modernization with EDGE deployment in GSM networks

results of a successful EDGE deployment for a Swiss mobile operator

due to mobile systems microwave access networks became very dense

continuous demand for capacity increase

statistics of the required TRS network upgrades were presented several rules of dense access network design

modernization projects give opportunity also for network optimization

network optimization example of a repeater showed 24x2 Mbit/s

capacity increase for a microwave transmission node

Thank You for Your Attention !30 2008 Nokia Siemens Networks - HILT Attila - Budapest , 1-Oct-2008.


31/31

High altitude FlexiHopper radio : JungfrauJoch

FHP radio

at3571 m


Date post:	04-Apr-2018
Category:	Documents
Upload:	bomjitto
View:	224 times
Download:	0 times

ACCESS TRANSMISSION NETWORK UPGRADE IN A NATIONWIDE MOBILE NETWORK MODERNIZATION PROJECT FOR EDGE...

Documents