3g interfaces rnc dimensioning

8/12/2019 3G Interfaces RNC Dimensioning

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RNC & 3G InterfacesDimensioning

Ramesh Babu

Nokia Networks

3G&IP Network Planning - APAC


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AGENDA

Dimens ionin g o f 3G Interfaces & RNC

Common Issues

Example Dimensioning


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MSC/VLR GMSC

CS Domain

Packetnetwork

PSTN

SMSC

HLR

Service & subscriber management

3G Network Architecture

GrGd

CG

Gn

GGSN

3G-SGSN

InternetIPBackbone

PS Domain

DNS

RADIUS

DHCP

Iu

Iu

Iu

Iu

Iur

RNCNode BUm

Iub

Node B

ATMPacketnetwork

SS7Network

ChargingCenter

NMS

BG

OtherPLMN


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3G MSCand/or

3G SGSN

Iur

Iu

RNC

BSBS

Iub

BS

RNC

BSBS

Iub

BS

RNC

BSBS

Iub

BS

Iu Iu

RNC

BSBS

Iub

BS

IurIur

IuIur

3G MSCand/or

3G SGSN

RAN

UuUser Equipment

(UE)

3G Interfaces in RAN

ATM is used as a transport solution in Radio Access Network (3GPP Rel.99)

ATM is standardised as transport bearer in Iub, Iur and Iu

ATM can be over PDH or SDH links


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Required Inputs for Dimensioning

Radio Network Planning Output:Number of Node Bs

Node B ConfigurationTotal number of Subscribers in each areaRF Planning assumptions (Blocking %, Soft Handover %,..)

Rollout Plan

Geographical Area Distribution or Regions

Different Type of Traffic UsageReal-time traffic (Voice and Circuit Switched Data)Non real-time traffic (All kind of packet data)Number of active PDP contexts per subscriber

Simultaneous Data Subscribers during busy hour

Equipment Location


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RAN & Core dimensioning Steps

INPUTS

Traffic

Hypothesis/Assumptions

INTERFACES

Iub_Voice

Iub_PS

Iub_CS Total_Iub

RNCIu_CS

Iu_PS

Circuit Core Dimensioning

Iur

Packet Core Dimensioning

3G-MSC

DNS, CG, ....

xGSN

MSS / GW


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Nokia

RNC

Nokia

UltraSite

WDCMA

BTS

Iub

NokiaMSC

Iu-cs

Iu-ps

Nokia

3G

SGSN

AAL2 USER PLANE

AAL2 SIG on AAL5

O&M on AAL5

ATM Module

Interfaces3G PP Standards


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Different OH for Different Traffic ClassesIub/Iur/Iu-CS Interface Overhead

Each different service require different overhead

Voice services Activity Service bit rate Bit rate below ATM TOTAL

kbps 12.76% OH

RT12.2 (AMR) UL active 12.2 18.9 73.00%

silent 0 4.5

RT12.2 (AMR) DL active 12.2 18.0 47.88%

silent 0 0.0

RT7.95 (AMR) UL active 7.95 13.5

silent 0 4.1

RT7.95 (AMR) DL active 7.95 12.6

silent 0 0.0

RT14.4 active 14.4 18.7

RT28.8 active 28.8 36.3

RT32 active 32 39.9

RT33.6 active 33.6 41.7

RT56.7 active 56.7 69.8

RT64 active 64 78.7 23%

NRT64 64 85.7 34%

NRT128 128 166.9

NRT256 256 329.3

NRT256 320 410.4

NRT384 384 491.6 28%

ATM O h d i I b


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ATM Overhead in Iub

For Voice Activity Factor of 65%

((18.9 x 65%) + (4.5 x 35%))

((12.2 x 65%) + (0 x 35%))--------------------------------------------------------------------------

((12.2 x 65%) + (0 x 35%))

= 73.7 %

For Voice Activity Factor of 50%

((18.9 x 50%) + (4.5 x 50%))((12.2 x 50%) + (0 x 50%))--------------------------------------------------------------------------

((12.2 x 50%) + (0 x 50%))

= 92 %

Real Time Voice @ 12.2 kbps


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ATM Overhead in IubReal Time CS Data 64 kbps

(78.764)

--------------64

= 23 %

Non Real Time PS Data 128 kbps

(166.9128)-----------------

128

= 30 %

I b Di i i


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Iub Dimensioning

Iub is the interface between Base Station and Radio Network Controller

Iub Traffic is the total of both Circuit Switched (Voice & data) and Packet Switched data

IubBS

BS

BS

Iur

Iub

Iub

RNC

RNC


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IubIub dimensioning 1/4dimensioning 1/4((VoiceVoice))

Input : Traffic ( mErl) / cell / region

BSConfig/ region

Method : Traffic (Erl) / BS

# TCh/ BS

Bit rate (kbps) / BS

Output :

@ BH@ BH

Activity Factor 50%SHO factor 40%

# TCh(voice) / BS

AMR rate 12.2 kbit/s

VoiceIub Bit rate (kbps) / BS

ATM OH voice +73%

Using Erlang B Table


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((

IubIubdimensioning 2/4dimensioning 2/4CS Data 64 kbpsCS Data 64 kbps))

Input : Traffic ( mErl) / cell / region

BSConfig/ region

Method : Traffic (Erl) / BS

# TCh/ BS

Bit rate (kbps) / BS

Output : CSIub Bit rate (kbps) / BS

@ BH@ BH


Line rate 64 kbps

# TCh(CS_data) / BS

ATM OH 64k +23%


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(

IubIubdimensioning 3/4dimensioning 3/4

(PS DataPS Data))

Input : Traffic ( kbits) / cell / regionBSConfig/ region

Method : Bit rate (kbps) / BS

Output : PSIub Bit rate (kbps) / BS

@ BH@ BH


ATM OH (64k +28%, 128k +25%, 384k +23%)

L1 adaptation rate 26.5%

For each service

I b Th h t C l l ti


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Iub Throughput Calculation

Circuit Switched Traffic (RT)

Voice AMR Data Rate - 12.2 Kbps

12.2 Kbps

Soft Handover - 40%

17.08 Kbps

ATM Overhead - 73%

29.54 Kbps

DTX - 50%

14.77 Kbps

Total Traffic =14.77 X Physical Channels required

Packet Switched Traffic (NRT)

Data Bearer 128 Kbps

XKbps

Soft Handover - 40%

XKbps

L1 Data Rate26.5%

ATM Overhead - 25%

XKbps

XKbps

Total Traffic =No of Subscribers X Traffic


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Iur Dimensioning


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Iur Dimensioning

Iur interface is the traffic between two different RNCs. Eg for Soft Handover

Iub

RNC

RNC

RNC

Iur

Iur


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SS DS DS

S

Base Station

Serving RNC D Drifting RNC

Soft Handover

Soft Handover


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Soft Handover

Soft Handover is assumed to be 40 %

Assumption

35% of the Mobiles are connected to two or more Base Stations at the same time.

30% of the Mobiles are in two way SHOs5% of the Mobiles are in three way SHOs

Consequently on average every Call occupies

65% x 1 + 30% x 2 + 5% x 3 = 1.4 Physical Channels

If One RNC handles 100 Voice Calls, it needs 140 Physical Channels (100 x 1.4)

Iur Dimensioning


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Iur Dimensioning

Iur traffic mainly depends on the pattern of RNC to RNC handover trafficParameters involved - Velocity of the Mobile, RNC area etc.

Each RNC will be connected to the adjacent RNC directly. One RNC could beconnected to many different RNCs.

Studies inside Nokia shows that Iur is about 78 % of Iub (user plane traffic).For dimensioning Nokia adopts 7.5 %.

MSC

IurRNC

BSBS

Iub

BS

RNC

BSBS BS

RNC

BSBS BS

Iu

Iur

MSCSGSN

IuIu

Iub Iub


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Example RNC Iur Interface Connection

RNC2

RNC3

RNC1

RNC5

RNC4

RNC Region 1

RNC Region 2

Example RNC Iur Interface Connection


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Example RNC Iur Interface ConnectionReal Case Example

RNC2

RNC3

RNC1

RNC5

RNC4

RNC Region 1

RNC Region 2

SINGAPORE

Why No Iur Connectionbetween

RNC2RNC4RNC3RNC1


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Iu Interface Dimensioning (1/3)

RNC

MGW

SGSN

Iu interface

Iu interface is split in to two parts

>Between RNC and MGW for Circuit Switched Traffic - Payload carried over AAL2>Between RNC and SGSN for Packet Switched Traffic - Payload carried over AAL5

P t l St k (I CS / I PS)
http://localhost/var/www/apps/Documents%20and%20Settings/Documents%20and%20Settings/rmateo/Local%20Settings/Temp/Introduction%20to%20ATM%20in%20RAN.ppt


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Protocol Stack (Iu CS / Iu PS)

AAL2

PHY

ATM

PHY

ATM

AAL2

FP

PHY

AAL2

PHY

ATM

LinkLayer

PHY

AAL2

PHY

ATM

WCDMAL1

FP

WCDMAL1

E.g.,Vocoder

PHY

PSTN/N-ISDN

AIuIubUu

IWU

RNC

Node B

UE

E

Iu-CS UPIu-CS UP

E.g.,Vocoder

LinkLayer

lawPCM,UDI,etc.

lawPCM,UDI,etc.

MSC

RLC-U

MAC

RLC-U

MAC

Circuit Switched ServicesIu CS

IP

AAL5

PHY

UDP

LLC/SNAP

GTP-U

ATM

PHY

ATM

AAL2

FP

PDCP

UDP

IP

Link

Layer

PHY

GTP

IP

AAL5

PHY

UDP

LLC/SNAP

GTP-U

ATM

UDP

IP

Link

Layer

PHY

GTP

AAL2

PHY

ATM

WCDMA

L1

FP

WCDMA

L1

PDCP

E.g.,IPv4, IPv6

PHY

E.g.,IPv4, IPv6

GnIuIubUuGGSN

3G-RNC

Node B

UEGi

RLC-U

MAC

RLC-U

MAC

Packet Switched ServicesIu PS

I f (2/3)I t f Di i i (2/3)


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IuIuInterface Dimensioning (2/3)Interface Dimensioning (2/3)((IuIuCS trafficCS traffic))

Input :

Method :

Output :

For each service (voice, CS 64 k, ..)

@ BH@ BH

Total Traffic (Erl) / RNC area

ErlangB (GOS-0.5%)

# TCh/ RNC area

Line rate (12,2; 64 k; )Activity Factor for voice:50%ATM OH (as inIub)Signalling overhead +1%

Traffic (Erl) / BS / region# BSs& Config/ region

Bit rate (kbps) / clutter


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Iu-PS Overhead - Example (1/3)


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128 bytes

8 bytesencapsulation

20 bytes

IP Header

8 bytesUDP

12 bytesGTP

8 bytesTrailer Bits

176 bytes

184 bytes

128 bytes




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48 bytes48 bytes 48 bytes 48 bytes

8 bytesPadding

184 bytes

48 bytes 48 bytes 48 bytes 48 bytes 48 bytes 48 bytes 48 bytes 48 bytes

48 bytes 48 bytes 48 bytes

48 48 48 40

48 bytes

192 bytes

5 bytesATM

Overhead

212 bytes


ATM Cells



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Iu PS Overhead Example (3/3)

128 bytes

212 bytes

Increase from Original 128 bytes to 212 bytes

Percentage of Increase - (212 128 / 128) * 100

65 % of Overhead for a IP Packet size of 128 Bytes

Iu-PS relative OH = (Packet size)


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( )

Iu Throughput Calculation


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g p

Circuit Switched Traffic to MSC

Voice AMR Data Rate - 12.2 Kbps

12.2 Kbps

ATM Overhead - 73%

23.54 Kbps

DTX - 50%

11.89 Kbps

Total Traffic =11.89 X Physical Channels required

Packet Switched Traffic to SGSN

Data Bearer 128 Kbps

XKbps

IP, ATM Overhead - 65%

XKbps

Signalling OH in SGSN - 1%

XKbps

Total Traffic =No of Subscribers X Traffic

Signalling OH in MSC - 1%

23.78 Kbps


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MSC/VLR GMSC

CS Domain

PacketnetworkPSTN

SMSC

HLR

Service & subscriber management

Gr

Gd

CG

Gn

GGSN

3G-SGSN

InternetIPBackbone

PS Domain

DNS

RADIUS

DHCP

Iu

Iu

Iu

Iu

Iur

RNCNode BUm

Iub

Node B

ATMPacketnetwork

SS7Network

ChargingCenter

NMS

BG

OtherPLMN

RNC Role


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RNC Role

Mobility Management Connection and Radio link Management

Ciphering and Integrity Checking

ATM and IP traffic management

Integrated Transmission Interfaces

Radio Network Controller (RNC)


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Rel.1 Release: 26-130 Mbit/s Dynamic Traffic Capacity

1 2

3

4

5

Release1 Phase 1

Conf ig.

Iub Mbit/s Node Bs Carriers STM-1 E1

1 26 85 256 4 64

2 52 128 384 4 96

3 78 170 512 4 128

4 104 213 640 4 160

5 130 256 768 4 192

Max. capaci ty in di f ferent co nf igurat ions

Iub traff ic capacity Interfaces

Radio Network Controller (RNC)


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Rel.2 Release: 48-196 Mbit/s Dynamic Traffic Capacity

1 2

3

4

5

Release 1 Phase 1.5

Conf ig.

Iub Mbit/s Node Bs Carriers STM-1 E1

1 48 128 384 4*4 6*16

2 85 192 576 4*4 8*16

3 122 256 768 4*4 10*16

4 159 320 960 4*4 12*16

5 196 384 1152 4*4 14*16

Iub traff ic capacity Interfaces

Max. capacity in different configu rations

RNC Area Planning


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RNC Area Planning

RNC

BS

GGSN

SGSN

MSC

ATMModule

BSBS

RNC Region-1

RNC

BS

BSBS

RNC Region-2

RNC Dimensioning


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Key limiting factors in RNC Dimensioning

Maximum Throughput

- Rel 1 130 Mbit/s

- Rel 2 196 Mbit/s

- Rel 3 400 Mbit/s

Maximum number or carriers

- Rel 1 768 Carriers



Maximum number of Node Bs

- Rel 1 256 BTS

- Rel 2 384 BTS

- Rel 3 768 BTS

depending on the case, one of the above limitations will apply

RNC Dimensioning Principle Summary


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Check the number of carriers per RNC

Check the number of NodeBs per RNC

RNC nominal traffic capacity

Carriers to be connectedCarriers connectivity per RNC * Fillrate

BTS to be connectedBTS connectivity capacity per RNC * Fillrate

Total user traffic in the area

Voice erlangs* 16kbit/s

CS-data erlangs* data rate

PS-data volume(busy hour)

* SHO overhead * SHO overhead * SHO overhead

Capacity Almost Independent of the Traffic Mix

RNC Dimensioning


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Dimensioning Crietria

Total throughput against the maximum throughput capacity of RNC

Total Carriers against the maximum carrier capacity of RNC

Total Base Stations against the maximum Node B capacity of RNC

Fill rate of 90%

Final No of RNC - Maximum value attained by the above three Criteria


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Common Issues

Throughput Capacity of RNC


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RNC throughput capacity expressed only in one direction and also represents only theCapacity of DMCU. O & M signalling is handled separately in OMU.

Nokia RNC could support 196 Mbps on UL and also 196 Mbps on DL.

Other Vendors mention the RNC throughput as 392 Mbps (UL + DL)

MGW

SGSN

196 Mbps

Iub

Iu

Traffic split between Voice & Data


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Throughput capacity of Nokia RNC is 196 Mbps.

What is the Traffic split between Voice and Data ?

Voice

Data

Combination of any percentage of Voice and Data

RNC upgrade from 196

400 Mbps


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196 Mbps 400 Mbps

Upgrade Path

No Upgrade path and cost defined yet.

400 Mbps RNC is provided as new boxes for the additional traffic for

Later phases.

Voice Channels - 16 kbps in RNC


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MGW

Voice Channel at 12.2 kbps or lesser

Voice Channel at 16 kbps

12.2 or lesser

Even lower bitrates requires as much processing capacity (user and control plane)Within RNC as a 16kbps channels.

In the Transmission it is taken as original bit rates.

Iur carried over Iu Interface


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RNC

BS

GGSN

SGSN

MSC

MGW

BSBS

RNC Region-1

RNC

BS

BSBS

RNC Region-2

RNC linked directly for Iur connection

Iur Traffic is carried through Iu over to core and then to RNC


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Interface Ports on RNC


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50 Node B- DU

50 X 0.33 E1

50 Node B- DU

50 X 0.33 E1

80 Node B- U

80 Node B- U

80 X 0.44 E1

80 X 0.44 E1

Star Configuration

No of E1 Interface required at RNC = 260

Available E1 Interface at RNC = 192 What is the Solution

AXC

AXC

AXC

AXC

1 X STM1

1 X STM11 X STM1

Introduce Multiplexing Equipment to Groom the Traffic


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ATM Overhead in RNC


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RNCNode B

ATM Transmission Medium

ATM OH added atNIU

ATM OH stripped offat the Interface unit

of RNC

ATM Overhead is considered only on the Transmission

The ATM OH is stripped off at the NIU of RNC

Hence traffic to RNC will not include ATM overhead.


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Dimens ion ing Exercise

Case Study


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Objective

Dimension the Interfaces Iub, Iu & Iur

Determine the number of RNCs required

Understand the output format from anIP Planner

3G RAN Network Dimensioning for an Operator in Singapore

Case Study


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SINGAPORE

Singapore classified in to four different regions Dense UrbanUrban

Suburban

Rural

DU UU SUSU

Indoor considered to be with in Dense Urban

.

.

.

.

.

.

.

.

..

. .

.

.

Inputs from Operator


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Subscriber Information

Subscribers Phase 1 Phase 2 Phase 3

Dense Urban 17477 45567 82478

Urban 15421 49055 109027

Suburban 1495 7674 20811

Rural 5607 32703 72685

Total 40000 135000 285000

Services to be offeredCircuit Switched

Voice 12.2 kbpsCS Data 14.4 kbpsCS Data 64 kbps

Packet Switched

PS Data 16 kbpsPS Data 64 kbpsPS Data 128 kbpsPS Data 384 kbps

kbps UL, Phase 1 Phase 2 Phase 3 kbps DL, Phase 1 Phase 2 Phase 3

Traffic for different Services


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PS 16 kbps/sub PS 16 kbps/sub

kbps/sub kbps/sub

Dense Urban 0.1760 0.2372 0.2778 Dense Urban 0.0176 0.0237 0.0278

Urban 0.3911 0.3954 0.3704 Urban 0.0391 0.0395 0.0370

Suburban 0.1956 0.2175 0.2223 Suburban 0.0196 0.0217 0.0222

Rural 0.2347 0.2768 0.2963 Rural 0 .0235 0.0277 0.0296

PS 64kbps UL,kbps/sub

Phase 1 Phase 2 Phase 3PS 64

kbps DL,kbps/sub

Phase 1 Phase 2 Phase 3

kbps/sub kbps/sub


Urban 0.0712 0.1014 0.1513 Urban 0.3735 0.3718 0.5095


Rural 0.0427 0.0709 0.1210 Rural 0 .2241 0.2603 0.4076

PS 128

kbps UL,

kbps/sub


PS 128

kbps DL,

kbps/sub


kbps/sub kbps/sub


Urban 0.3547 0.9239 2.1859 Urban 1.3745 2.0361 0.0Suburban 0.1773 0.5081 1.3115 Suburban 0.6873 1.1199 0.0

Rural 0.2128 0.6467 1.7487 Rural 0 .8247 1.4253 3.1681

PS 384

kbps UL,

kbps/sub


PS 384

kbps DL,

kbps/sub


kbps/sub kbps/sub


Urban 0.0 0.0 0.0 Urban 0.0 0.0 3.9602


Rural 0.0 0.0 0.0 Rural 0.0 0.0 0.0

CS Voice 12.2 Phase 1 Phase 2 Phase 3

mE/sub

27.0 32.0 56.0

CS Data 14.4 Phase 1 Phase 2 Phase 3

mE/sub

4.0 8.0 10.0

CS Data 64 Phase 1 Phase 2 Phase 3

mE/sub

0.0 0.0 8.0

Radio Planning Output


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Region Base Station Type Phase 1 Phase 2 Phase 3

Dense Urban UltraSite Optima Compact ROC 145 215 0

UltraSite Optima Compact CEC 0 0 215

Urban UltraSite Optima Compact CEC 302 604 900

Suburban UltraSite Optima Compact CEC 131 221 429

Rural MetroSite Node B 100 190 290

Other Radio Planning Parameters

Radio Blocking 2 %Voice Activity Factor (DTX) 67%Soft Handover Factor 40%Voice AMR Data Rate 12.2 kbps

Iub CalculationCS Voice Traffic


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ADD ATM OH forVoice 73%

Taking into

account only 67%of traffic due to

DTX.

Multiplied byAMR data rate of

12.2 kbps

Adding SHOfactor of 40%

Using Erlang BTable withBlocking

probability of 2%

Voice Traffic of27mErl multiplied

by the subs.

Dense Urban Urban Suburban Rural

Subs and BTS SitesBTS Configuration 111 111 111 111

Number of Sites 145 302 131 100

Total Number of Sites 145 302 131 100

CS Voice

No of Subs 17,477 15,421 1,495 5,607

Total Subs / BS 120.53 51.06 11.41 56.07

Total Erl / BS 3.25 1.38 0.31 1.51

Phy CH Req. 8 5 3 5SHO 11.20 7.00 4.20 7.00

Bit Rate (Kbps) 136.64 85.40 51.24 85.40

DTX 91.55 57.22 34.33 57.22

Bit Rate (Kbps)+ATM O_H 158.38 98.99 59.39 98.99

Phase 1

Iub CalculationCS Data Traffic


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Voice + CS Data+ 1% Sig OH in

MSC

ADD ATM OH forCS Data 25%

Multiplied by datarate of 144 kbps


Using Erlang BTable withBlocking

probability of 2%

CS Data of 4mErlmultiplied by the

subs.

Dense Urban Urban Suburban Rural

CS Data @ 14.4 kbpsSimultaneous Subscribers 7119 13959 677 3046

Subscribers per BS 49.10 46.22 5.17 30.46

Total Erl / BS 0.20 0.18 0.02 0.12

Phy CH Req 2 2 2 2

SHO 2.80 2.80 2.80 2.80

Bit Rate (Kbps) 40.32 40.32 40.32 40.32

Bit Rate (Kbps)+ATM O_H 49.59 49.59 49.59 49.59

Phase 1

Total CS Voice 158.38 98.99 59.39 98.99Total CS Data 49.59 49.59 49.59 49.59

Total CS Traffic + Sig.OH 210.05 150.07 110.08 150.07

Iub CalculationPS Data Traffic (16 kbps)


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26.5% OH for

retransmission &bufferingADD ATM OH for

PS Data 16 kbps58%


PS 16 kbps datatraffic. Max of UL

or DL


PS Data 16 Kbps

Simultaneous Subscribers 17477 15421 1495 5607Subscribers per BTS site 120.53 51.06 11.41 56.07

Data Rate Kbps 21.21 19.97 2.23 13.16

L1 Data Rate Kbps 28.28 26.63 2.98 17.55

SHO 39.60 37.28 4.17 24.56

Bit Rate (Kbps) + O_H 62.56 58.90 6.58 38.81



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ADD ATM OH forPS Data 64 kbps

33%

PS 64 kbps datatraffic. Max of UL

or DL


Total PS Data 16 kbps 62.56 58.90 6.58 38.81

33% OH forretransmission &

buffering

Adding SHO

factor of 40%

PS Data 64 kbps

Simultaneous Subscribers 17477 15421 1495 5607

Subscribers per BTS site 120.53 51.06 11.41 56.07Data Rate Kbps 20.26 19.07 2.13 12.57

L1 Data Rate Kbps 27.01 25.43 2.84 16.75

SHO 37.82 35.60 3.98 23.46

Bit Rate (Kbps) + O_H 50.30 47.35 5.29 31.20



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ADD ATM OH forPS Data 64 kbps

30%

PS 128 kbps data

traffic. Max of ULor DL33% OH forretransmission &buffering





PS Data 128 kbps

Simultaneous Subscribers 17477 15421 1495 5607

Subscribers per BTS site 120.53 51.06 11.41 56.07

Data Rate Kbps 74.55 70.19 7.84 46.24

L1 Data Rate Kbps 99.40 93.58 10.46 61.66

SHO 139.15 131.01 14.64 86.32

Bit Rate (Kbps) + O_H 180.90 170.32 19.03 112.22

Iub Calculation


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Total Iub + 10%Signalling OH

Total CS + PSTotal CS Traffic + Sig.OH 210.05 150.07 110.08 150.07Total PS Data 16 kbps 62.56 58.90 6.58 38.81



Total Traffic Per BS kbps 503.82 426.63 140.98 332.29

BS Traffic + Sig OH in Mbps 0.55 0.47 0.16 0.37

RNC

DU U SU Rural

0.55 Mbps

0.47 Mbps 0.16 Mbps

0.37 Mbps

Iu CalculationIu CS Voice


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Multiplied byAMR data rate of

12.2 kbps

Using Erlang BTable with

Blocking prob of0.5%

Total Voice Trafficirrespective of No

of BS as in IubCS Voice

No of Subscribers 17477 15421 1495 5607Total V_Erl (Erl) 471.88 416.37 40.37 151.39

CSV_CH 508 451 56 176

Total Voice in kbps 6197.6 5502.2 683.2 2147.2

Total traffic + O_H Mbps 10.72 9.52 1.18 3.71

Note : No Soft Handover in Iu interface.

Iu CalculationIu CS Data


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Voice with DTX +CS Data & 1&

Sig in MSC


Multiplied by

AMR data rate of12.2 kbps

Using Erlang BTable with

Blocking prob of0.5%

Total CS DataTraffic

irrespective of Noof BS as in Iub

CS Data @ 14.4 Kbps

Subscribers 7119 13959 677 3046

Total V_Erl (Erl) 28.48 55.84 2.71 12.18

CSD_CH 42.00 73.00 8.00 22.00

Total CS Data in kbps 604.80 1051.20 115.20 316.80

Total CS Data + O_H Mbps 0.74 1.29 0.14 0.39

Total Iu CS Voice 10.72 9.52 1.18 3.71

Total Iu CS Traffic

Total Iu CS Data 0.74 1.29 0.14 0.39

RNC ---> MSC Mbps 8.01 7.75 0.94 2.91

Total Iu CS Traffic for Singapore for Phase 1 = 19.61 Mbps

Iu CalculationIu PS Data


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Add 1%Signalling OH in

SGSN

Add IP/ATMTraffic OH basedon Packet size

Total PS Data ofall services. Max

of UL/DLIu PS Traffic

RNC to SGSN Traffic 16.82 14.84 1.44 5.40

PD Traffic + O_H Mbps 18.67 16.48 1.60 5.99

Traffic to SGSN + Sig OH 18.86 16.64 1.61 6.05

Total Iu PS Traffic for Singapore for Phase 1 = 43.16 Mbps

RNC

Iu CS 19.61 Mbps

Iu PS 43.61 Mbps

MGW

SGSN

RNC Dimensioning


68/70

Projected Time Schedule

Phases Roll Out RNC

Phase 1 2H 2002

Phase 2 2H 2003

Phase 3 2H 2004

196 Mbps

196 Mbps

400 Mbps

What Release of RNC to be proposed ?

RNC Dimensioning

A BS T #Sit (BS)

Total Iub

it

Total BS

traffic

t RNC

Total RNC

Traffic

(Mb )

Total

C i

# RNC

Limited

C i

Required

# f RNC

#RNC

Limited by

N d B

# RNC

Limited

P i

RNC 1

RNC 2 T t l


69/70

Total Trafficwithout ATMOverhead

Note: ROC BSType for DU

which is only 1Carrier

Addl Traffic after

deducting thecapacity of RNC

in Phase2

Area BS Type #Sites (BS) per site to RNC (Mbps) Carriers

(Mbps) Mbps

Phase 1 216.5 1,744

DU 111 ROC 145 0.6 63.23

U 111 302 0.5 107.58

SU 111 131 0.2 17.07

Rural 111 100 0.4 28.67

678

Phase 2 897.4 3,705

DU 111 CEC 215 1.7 270.16

U 111 604 0.9 387.93

SU 111 221 0.3 55.75

Rural 111 195 1.3 183.57

1235

Phase 3 3893.6 5,562

DU 111 215 6.4 1,005.36

U 111 900 2.8 1,863.35

SU 111 429 0.9 295.42 Addl Traffic

Rural 111 310 3.2 729.50 2982.4

1854

Fill Rate of 80% Used

Carriers # of RNC

Full

Config on

Last RNC

1.89 1.38 2.21 2.21 2 1 0 3

NodeBProcessing

Capacity

RNC 2 Total

4.02 5.72 4.02 5.72 5 4 0 6

5 4 10 16

9.32 9.32

1

2

3

4

5 1

Phase 1 Configuration

1

2

34

51

2

34

5

X 5

1

2

34

Phase 2 Configuration

1

2

34

5

X 5

1

2

34 Phase 3 Config

X 10 - 400 Mbps


70/70