07%2E UTRAN Design Process

7/29/2019 07%2E UTRAN Design Process

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UTRAN NETWORK DESIGN


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1Presentation name - Date - 1

1

UMTSUTRAN


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2

UMTS

UMTSUMTS(TRAFFIC)UMTS


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3

UMTS 4 classes of services

9 Model of applications

Basic browsingMobile office

internet

Info Service & E-

Commerce

Interactive

Background

E-mail

Video Streaming Audio Streaming

Streaming

Video Conference Speech CS Data

Conversational


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4

UMTS(Interactive / Background)

Interactive Background

Pattern :

Delay Constraints :

Error protection :

Request Answer Content Download

No delay constraint

End-user = humanNeeds reactivity

End user = machineDelivery time insensitive

Data mostly downlink

Error correction by retransmission protocols (RLC ack mode, TCP)

Preserve Payload Content


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5

UMTS(Streaming / Conversational)

Streaming Conversational

DL continuous data Both way continuous data

Acceptable delay variation Real time strong constraint

No Error Protection

No time to correct error by retransmission

(RLC unack mode, UDP)

Relatively non bursty traffic

End User = HumanSensitive to delay variation (Jitter)

Pattern :

Delay Constraints :

Error protection :

End User = Machine

Buffer at the receiving end

,,.


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()ON/ OFF model for PS application

Session description (ON / OFF model for packet arrival) :Nb of sessions / subs / BH

% of sessions with a file download

For each session : Nb of pages (or Email) Downlink Size of pages (or Email) in kBytes Size of file to download (kBytes)

ON period ONperiod

ON period

OFF period OFF period

Uplink

Downlink

One Session


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()ON/ OFF ()Interactive: Basic browsing

Background: E-mail

1st E-mail

received

E-mail

Reading

Uplink

OFF

120 s

E-mail Reading+

Preparing answer

8 KB

8 KB

ON OFF

45 s

8 KB

45 s

8 KB

OFF

45 s

8 KBDownlink

2 nd E-mail

received

E-mail

Reading

Downlink

Uplink

7 s 7 s

0.4 kB 0.4 kB 0.4 kB0.4 kB

50 KB 50 KB 50 KB 50 KB

7 s

0.4 kB

50 KB

OFF OFF OFF OFF

7 s

Uplink

request

Page

downloading

Page

reading

One Session


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() Duration of session

Application level (from user point of view)

Iu Connection duration = RAB duration

Example: Interactive Application (Ex. Basic Browsing)

RAB

Downlink

Uplink

7 s 7 s

0.4 kB 0.4 kB 0.4 kB

7 s

0.4 kB

50 KB 50 KB 50 KB 50 KB

7 s

0.4 kB

50 KB

7sec < Trelease

Iu Connection Duration = RAB duration

Session duration (user point of view)

A RAB is made of :

1 radio bearer UL1 radio bearer DL

1 Iu connection

oSignal. RANAP/SCCP +

o User plane


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: Activity Factor (1/2) Activity Factor Uplink and Downlink for PS services

Depends on ON/OFF model

Downlink AF = ON DL / (Iu Cnx duration), where Iu Cnx durationmeans Iu connection duration, this is the duration of the radiobearer.

Uplink AF = DL AF *(kbit/s UL)/ (kbit/s DL) * (data rate UL / Datarate DL)Assuming Page Request ON Uplink


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Idle

Downsized

RAB

Downlink

Uplink

7 s 7 s

0.4 kB 0.4 kB 0.4 kB

7 s

0.4 kB

50 KB 50 KB 50 KB 50 KB

7 s

0.4 kB

50 KB

7sec < Tdownsize

Iu Connection Duration = RAB duration

Session duration (user point of view)

: Activity Factor (2/2)

ON Downlink

Iu Connection

Duration

Session Duration

Ex of Interactive traffic (Basic Browsing) :


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1. Page/Email size (kBytes)

2. # of Page/Email (UL, DL)

3. Nb of Sessions/BH/attached subscriber


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4. % of sessions with attachment or file transfer

5. Attachment Size(kBytes)

6. Call Duration

,,

::


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()Throughput per sub

subErlAFratedataBearersubThroughput /..__/

3600

.#_..__/

SessiondurationSessionAFratedataBearersubThroughput

servicess

sThroughput

sThroughputsX)(

)()(

CS Traffic

PS Traffic

Traffic Mix

For example, Web browsing (DL):

Bearer_data_rate = 64K

AF = 45%

Session_duration = 85 s

#Session = 0.15 /BH

then, Throughput /sub = 64000*45%*(85*0.15)/3600 = 102 bit/s


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()-UTRAN Mobility Link with the UTRAN:

Parameters

%SHO = 30% (with %SofterHO=40% and %intraRNCSHO=45% and %InterRNCSHO = 15%)

Nb of cells in SHO = 2

Average time between 2 HO = 10 sec

RNC3 RNC4RNC1

BS1 BS2 BS4 BS5

within the same BS =

- UTRAN : Softer Hand Over- CN : not seen

InterNodeB, within same RNC =

- UTRAN : Soft Hand Over

- CN : not seen

RNC2

BS3

Iur

InterNodeB, with 2 RNC (no Iur)=

- UTRAN : Hard HO

- CN : Hard HO

Impact CN

InterNodeB, with 2 RNC (Iur present)

=-UTRAN : Soft HO inter RNC

- CN : not seen

Macrodiversity and Handover :

Average number of Radio Links per user 1,3

Ratio of SofterHO / (SoftHO+SofterHO+interRNC SHO) 0,40

Ratio of InterRNC SHO / (SoftHO+SofterHO+interRNC SHO) 15%

Average time between 2 HO (s) 10,0

Soft HO:UTRANHard HO:UTRAN, CN


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()-PSPS Mobility Several types of RA updates : A) Intra SGSN RA updates ()

intra SGSN RA Update

B) Inter SGSN RA updates

Intra system (3G 3G) or Inter system (3G 2G)

Incoming or Outgoing inter SGSN RA Update

Mobile moves within the same SGSN(RA1 RA2)

Old-SGSN =

New-SGSN

RA1RA2

Old-SGSN New-SGSN

RA1 RA2

Mobile moves to a new SGSN(RA1 RA2)

Mobility ManagementPacket

SwitchedRouting Area update :

# of intra 3G-SGSN Routing Area Update 0,600

% of periodic RA update 70%

Inter SGSN RA Update outgoing : 3G--> 3G 0,040Inter SGSN RA Update outgoing : 2G--> 3G 0,010Inter SGSN RA Update incoming : 3G --> 3G 0,040Inter SGSN RA Update incoming : 3G --> 2G 0,010


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()-CSCS Mobility

User is not in communication : LA updates

A) Intra VLR LA updates (Periodic or not)

B) Inter VLR LA updates

User is in communication : Hand Over

Intra MSC intra MSC HO

Inter MSC HO intra system (3G 3G, 3G 2G) Incoming or Outgoing inter MSC HO

Subsequent HO :

Incoming (2G or 3G 3G 3G or 2G ) Outgoing (3G 3G or 2G 3G or 2G)

Mobile moves within the same VLR(LA1 LA2)

Old-VLR =

New-VLR

LA1 LA2

Old-VLRNew-VLR

LA1 LA2

Mobile moves to a new VLR(LA1 LA2)

MSC1 MSC2

Mobile moves to a new MSC while in call

- MSC1 : outgoing HO

- MSC2 : Incoming HOLand

MSC1 MSC2

Mobile moves to a new MSC while in call

- MSC1 : outgoing subsequent HO

- MSC3 : incoming subsequent HOLand

MSC3


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..

Traffic

Traffic per attached subs during

BH

Signaling Subscribers ratio

Detach, Attach, Active Sub ratio

Session Management

PDP context related

Mobility Management

Routing Area update

Location Area update

Hand OversCall Distribution Ratio

M-L, L-M, M-M


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UMTSUTRANUMTSUTRANIBTSIubNodeBRNC


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UMTS

,,,,

,

UnivityUnivity iBTSUnivity iBTS Univity iBTS

UnivityRNC


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UMTSUTRANUMTSUTRANBTSIubNodeBRNC


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#BTS, BTS type

Max Kbit/s per BTS

Call profile Coverage Radio conditions#carriers

Environment definitionEb/No target, BLER per service

SHO parameters...

Km2

per environment

Erlang per CS service

Kbit/s per PS service

#E1 Iub leaving the BTS

#STM1/E1 Iub

Kbit/s per RNC

Existing/forecasted

infrastructureTransmission

BLER,

SHOp

arameters

RNC dimensioning

Iub links dimensioning

Backhaul dimensioning

UTRAN

BTS dimensioning

Iu+Iur dimensioning


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Class (Conversational/Streming/Interactive/Background)Bearer data rate (UL and DL)

BLER

Soft hard over ratio# Cells in macro diversity

#carriers

Environment definitionEb/No target

RF linkbudget.


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#BTS, BTS type

Max Kbit/s per BTS


Environment definitionEb/No target, BLER per service

SHO parameters...

Km2

per environment



#E1 Iub leaving the BS

#STM1/E1 Iub

Kbit/s per RNC

Existing/forecasted

infrastructureTransmission

BLER,

SHOp

arameters

RNC dimensioning

BTS Iub links dimensioning


UTRAN

BTS dimensioning

Iu+Iur dimensioning


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UMTSUTRANUMTSUTRANBTSIubNodeBRNC


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Univity iBTS


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Univity iBTS

Network

Interface

CCM (0)CCM (0)

SYNC (0)

(option)

TRM

TRM

TRM

/

CEM

CEM

CEM

CEM

CEM

CEM

WCDMA

CE

CESF

PA

PA

PA

6

6

6

f2f1,f2,f3

D

D

D

D

D

D

PA

PA

PA

f3

f1,f2,f3

f1

30W

45W

-

f2

f1,f2,f3


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UNIVITY iBTS CEM

CEM

N+1

CCM,

1+1

TRM GPSAMGPS MCPA DDM


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iBTS


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iBTS: Xa-b-c-d (eg.S3-1-128-3 STSR1)

X = BTS sectorisation Possible values : O (Omni) or S (Sectorial)

a = number of Sectors

Possible values = 1, 2, 3 or 6

b = number of RF Carriers Possible values = 1, 2, 3

c = number of spreading codes

Possible values = 64, 128 and multiples

d = number of Power Amplifiers

Possible values = 1, 2, 3 or 6

TD = Transmit Diversity (optional)


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CEM-CEMRF

CEM64 CEM128

RAB UL/DL kbps + SRB UL SF DL SFNumber of

links

Number of

links

CE per

link

Conversational/Speech

CS RAB 12.2/12.2 kbps + SRB 3.4 kbps 1x64 1x128 64 128 1

Conversational/Unknown

CS RAB 64/64 kbps + SRB 3.4 kbps 1x16 1x32 16 32 4

Streaming/Unknown

CS RAB 14.4/14.4 kbps + SRB 3.4 kbps 1x64 1x128 64 128 1

Interactive or Background

PS RAB 32/8 kbps + SRB 3,4 kbps 1x32 1x128 32 64 2





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BTS

W-CDMA trade-off

(4)()

(micro, indoor, ..)


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BTS Step1.

Based on the Link Budget (eg. Cell Radius per environment) Increase the number of sites if dimensioning is capacity-based

Step2.NodeB UL Load Radio UL capacity

PA Radio DL capacity

TRM Codes DL capacity

CEM CEM UL/DL capacity

Step3.BTS

NodeB


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Presentation name - Date - 3636

iBTSCall profile Radio conditions

#carriersEnvironment definition (TU50..)

Eb/No target, BLER per service

SHO parameters...



Traffic mix x(s)

Radio UL/DL

capacity per service

CEM UL/DL


Hardware

limitation

Service

definition

Carrier DL


BTS capacity in UL and DL

BTSCEM


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#BTS, BTS type

Max Kbit/s per BTS


Environment definition (TU50..)Eb/No target, BLER per service

SHO parameters...

Km2

per environment



#E1 Iub leaving the BTS

#STM1/E1 Iub

Kbit/s per RNC

Existing/forecasted

infrastructureGSM/GPRSTransmission

BLER,

SHOpa

rameters

RNC dimensioning

BTS Iub links dimensioning


UTRAN

BTS dimensioning

Iu+Iur dimensioning


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Iub

Signalliing + OaM

Iub main traffic

Iub diversity traffic

=f(BTS average capacity, Headers+BLER)

=f(SHO parameters)

Iub

=f(Signalling/OaM)

Node B(BTS) RNC

Iub

Iub_traffic = Iub_traffic_main + Iub_traffic_diversity + Iub_Sig_OaM


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Soft Handover

RNC RNC

Node B

UE

Core Network

InterNodeB

SHO

InterRNC

SHO

Case 1 : Softer

handover

Case 2 : Soft handover

2Iub

Case 3 : Inter RNC soft

Handover

2Iub

1Iur

Iub_traffic_diversity =

Iub_traffic_main x %SHO_Iub


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Main

+diversity

+OAMTraffic main

Iub Links

(E1s)Physical layer

Iub Interface Dimensioning

part for Macro DiversityNote: depends on traffic mix, SHO parameters

part for Signalling+OaM

30% Eng margin

Protocol headers + radio retransmissions

Note: depends on the traffic mix, BLER and service definition

Iub

RLCMAC-d

ATM

PHY

PHY

Dch FP

AAL2

Headers + Radio

retransmissions impact

Note: depends on service definition,

traffic mix and BLER

Traffic offered

by the BS

#Iub_linkIubE1,


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NodeB-RNC

1. (PP7K)---BTS.

2. E1---MUX(: TN-1X)

N d B RNC


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NodeB-RNC

RNC

-

-

NodeBN2

UMTS IBTS1 Fract E1

15 TS

E1E1

UMTS IBTS

1 Fract E1

15 TS

NodeB

N1

NodeBE1.

3. Drop&Insert E1

..

#1 #2#1


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Iub

:UMTS.

PP7KConcentration site

E1 Iub STM1 Iub

RNC site

PP7K:

BS

(PP7K)

20% eng.

margin

Traffic

offered bythe BS

BSE1

RNC

STM-1

Average traffic handled by

the BS :

Main + Diversity + Signalling

+ OaM

Layer 1+ radio

retransmissions30%


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07%2E UTRAN Design Process

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