A0002 3g Interfaces RNC Dimensioning

RNC & 3G InterfacesRNC & 3G InterfacesDimensioningDimensioning

Ramesh Babu

Nokia Networks

3G&IP Network Planning - APAC

AGENDA

• Dimensioning of 3G Interfaces & RNC

• Common Issues

• Example Dimensioning

MSC/VLR GMSC

CS Domain

PacketnetworkPSTN

SMSC

HLR

Service & subscriber management

3G Network Architecture

Gr Gd

CG

Gn

GGSN

3G-SGSN

InternetIP Backbone

PS Domain

DNS

RADIUSDHCP

Iu

Iu

Iu

Iu

Iur

RNCNode BUm

Iub

Node BATM

Packetnetwork

SS7Network

ChargingCenter

NMS

BG

OtherPLMN

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

Uu

User Equipment(UE)

User 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

Required Inputs for Dimensioning

• Radio Network Planning Output:• Number of Node Bs• Node B Configuration• Total number of Subscribers in each area• RF Planning assumptions (Blocking %, Soft Handover %,..)

• Rollout Plan

• Geographical Area Distribution or Regions

• Different Type of Traffic Usage• Real-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

RAN & Core dimensioning StepsRAN & 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

NokiaRNC

NokiaUltraSiteWDCMA

BTS

Iub

Nokia MSC

Iu-cs

Iu-ps

Nokia

3GSGSN

RANAP on AAL5

AAL2 SIG on AAL5

USER PLANE on AAL2

RANAP on AAL5

USER PLANE on AAL5

AAL2 USER PLANE

AAL2 SIG on AAL5

O&M on AAL5

ATM Module

Interfaces – 3G PP StandardsInterfaces – 3G PP Standards

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

Each different service require different overheadEach 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 13.5silent 0 4.1

RT7.95 (AMR) DL active 7.95 12.6silent 0 0.0

RT14.4 active 14.4 18.7RT28.8 active 28.8 36.3RT32 active 32 39.9RT33.6 active 33.6 41.7RT56.7 active 56.7 69.8RT64 active 64 78.7 23%

NRT64 64 85.7 34%NRT128 128 166.9NRT256 256 329.3NRT256 320 410.4NRT384 384 491.6 28%

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

ATM Overhead in Iub Real Time CS Data 64 kbps

(78.7 – 64) -------------- 64

= 23 %

Non Real Time PS Data 128 kbps

(166.9 – 128) ----------------- 128

= 30 %

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

IubIub dimensioning 1/4 dimensioning 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) / BSAMR rate 12.2 kbit/s

Voice IubBit rate (kbps) / BS

ATM OH voice +73%

Using Erlang B Table

((IubIub dimensioning 2/4dimensioning 2/4

CS Data 64 kbpsCS Data 64 kbps ))

Input : Traffic ( mErl) / cell / region

BSConfig/ region

Method : Traffic (Erl ) / BS

# TCh / BS

Bit rate (kbps) / BS

Output : CS IubBit rate (kbps) / BS

@ BH@ BH

Activity Factor 100%SHO factor 40%

Line rate 64 kbps

# TCh (CS_data) / BS

ATM OH 64k +23%

(IubIub dimensioning 3/4dimensioning 3/4

(PS DataPS Data ))

Input : Traffic (kbits) / cell / region

BSConfig/ region

Method : Bit rate (kbps) / BS

Output : PS IubBit rate (kbps) / BS

@ BH@ BH

Activity Factor 100%SHO factor 40%ATM OH (64k +28%, 128k +25%, 384k +23%)

L1 adaptation rate 26.5%

For each service

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

X Kbps

Soft Handover - 40%

X Kbps

L1 Data Rate – 26.5%

ATM Overhead - 25%

X Kbps

X Kbps

Total Traffic = No of Subscribers X Traffic

Iub Throughput Calculation

Circuit Switched Traffic (CS Voice and CS Data) =

Packet Switched Traffic =

X Physical Channels required

X Subscribers

Total Iub Traffic = Circuit Switched Traffic + Packet Switched Traffic

10% Signalling Overheadin BSS

Iur Dimensioning

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

Iub

RNC

RNC

RNC

Iur

Iur

SS DS DS

S

Base Station

Serving RNC D Drifting RNC

Soft Handover

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 SHOs 5% 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

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

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

• Studies inside Nokia shows that Iur is about 7 – 8 % of Iub (user plane traffic). For dimensioning Nokia adopts 7.5 %.

MSC

IurRNC

BSBS

Iub

BS

RNC

BSBS BS

RNC

BSBS BS

Iu

Iur

MSC SGSN

IuIu

Iub Iub

Example RNC Iur Interface Connection

RNC2

RNC3

RNC1

RNC5

RNC4

RNC Region 1

RNC Region 2

Example RNC Iur Interface ConnectionReal Case Example

RNC2

RNC3

RNC1

RNC5

RNC4

RNC Region 1

RNC Region 2

SINGAPORE

Why No Iur Connection between

RNC2 – RNC4RNC3 – RNC1

Iu Interface Dimensioning (1/3)Iu Interface Dimensioning (1/3)

RNC

MGW SGSN

CS

PS

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

Protocol Stack (Iu CS / Iu PS)Protocol Stack (Iu CS / Iu PS)

D O C U M E N T T Y P E 1 ( 1 )

T y p e U n it O r D e p a r tm e n t H e r eT y p e Y o u r N a m e H e r e T y p e D a te H e r e

A A L 2

P H Y

A T M

P H Y

A T M

A A L 2

F P

P H Y

A A L 2

P H Y

A T M

L in kL a y e r

P H Y

A A L 2

P H Y

A T M

W C D M AL 1

F P

W C D M AL 1

E .g . ,V o c o d e r

P H Y

P S T N /N - IS D N

AI uIu bU u

IW U

R N C

N o d e B

U E

E

Iu - C S U PIu - C S U P

E .g . ,V o c o d e r

L in kL a y e r

la wP C M ,U D I ,e tc .

la wP C M ,U D I ,e tc .

M S C

R L C - U

M A C

R L C - U

M A C

Circuit Switched Services – Iu CS

D O C U M E N T T Y P E 1 ( 1 )

T y p e U n itO r D e p a r tm e n tH e r eT y p e Y o u r N a m e H e r e T y p e D a te H e r e

I P

A A L 5

P H Y

U D P

L L C / S N A P

G T P - U

A T M

P H Y

A T M

A A L 2

F P

P D C P

U D P

I P

L in kL a y e r

P H Y

G T P

I P

A A L 5

P H Y

U D P

L L C / S N A P

G T P - U

A T M

U D P

I P

L in kL a y e r

P H Y

G T P

A A L 2

P H Y

A T M

W C D M AL 1

F P

W C D M AL 1

P D C P

E .g . ,IP v 4 , IP v 6

P H Y

E .g . ,IP v 4 , IP v 6

G nIuIu bU uG G S N

3 G -S G S N

R N C

N o d e B

U EG i

R L C - U

M A C

R L C - U

M A C

Packet Switched Services – Iu PS

IuIu Interface Dimensioning (2/3)Interface Dimensioning (2/3)((IuIu CS 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 in Iub)

Signalling overhead + 1%

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

Bit rate (kbps) / clutter

IuIu Interface Dimensioning (3/3)Interface Dimensioning (3/3)((IuIu PS trafficPS traffic ))

Input : Traffic (kbits) / BS / region

#BSs&Config/ region

Method :

Output : Bit rate (kbps) / region

@ BH@ BH

ATM, AAL5, IP, UDP, GTP OH + 25%Signalling overhead + 1%

Bit rate (kbps) / clutter

For packet sizeOf 512 bytes

Iu-PS Calculation ExampleIu-PS Calculation ExampleFor Packet Switched traffic, OH varies with the length of the IP packet

1. Packet length = 128 Bytes

2. AAL5 PDU = (128 + 8 Encap+20 IP+ 8 UDP+ 12 GTP ) = 176 bytes

3. AAL5 PDU + trailer = (176+8) = 184

4. AAL5 Padding = roundup(184/48) x 48 = 192 (11 bytes padding)

5. Including ATM headers = 192/48 x 53 = 212 Bytes

Total OH required = 69% ((212-128)/128)

DOCUMENTTYPE

TypeUnitOrDepartmentHereTypeYourNameHere TypeDateHere

ATM AAL5 Encap IP UDP GTP ….Data

8 20 8 12 (packet length)

128 bytes

8 bytes encapsulation

20 bytes IP Header

8 bytes UDP

12 bytes GTP

8 bytes Trailer Bits

176 bytes

184 bytes

128 bytes

Iu-PS Overhead - Example (1/3)Iu-PS Overhead - Example (1/3)

48 bytes48 bytes 48 bytes 48 bytes

8 bytes Paddin

g

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 bytes ATM

Overhead

212 bytes


ATM Cells


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)

Iu Throughput Calculation• 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

X Kbps

IP, ATM Overhead - 65%

X Kbps

Signalling OH in SGSN - 1%

X Kbps

Total Traffic = No of Subscribers X Traffic

Signalling OH in MSC - 1%

23.78 Kbps

Radio Network Controller (RNC)

Based on Nokia ATM Platform

3G Network Architecture

MSC/VLR GMSC

CS Domain

PacketnetworkPSTN

SMSC

HLR

Service & subscriber management

Gr Gd

CG

Gn

GGSN

3G-SGSN

InternetIP Backbone

PS Domain

DNS

RADIUSDHCP

Iu

Iu

Iu

Iu

Iur

RNCNode BUm

Iub

Node BATM

Packetnetwork

SS7Network

ChargingCenter

NMS

BG

OtherPLMN

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

1 2

3

4

5

Release1 Phase 1

Config.

Iub Mbit/s Node Bs Carriers STM-1 E11 26 85 256 4 642 52 128 384 4 963 78 170 512 4 1284 104 213 640 4 1605 130 256 768 4 192

Max. capacity in different configurationsIub traffic capacity Interfaces

Radio Network Controller (RNC)Rel.2 Release: 48-196 Mbit/s Dynamic Traffic Capacity

1 2

3

4

5

Release 1 Phase 1.5

Config.

Iub Mbit/s Node Bs Carriers STM-1 E11 48 128 384 4*4 6*162 85 192 576 4*4 8*163 122 256 768 4*4 10*164 159 320 960 4*4 12*165 196 384 1152 4*4 14*16

Iub traffic capacity InterfacesMax. capacity in different configurations

RNC Area Planning

RNCBS

GGSN

SGSN

MSC

ATM Module

BSBS

RNC Region-1

RNCBS

BSBS

RNC Region-2

RNC DimensioningRNC DimensioningKey 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 PrincipleRNC Dimensioning Principle Summary Summary

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 DimensioningRNC Dimensioning

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

Common IssuesCommon Issues

Throughput Capacity of RNCThroughput Capacity of RNC

RNC throughput capacity expressed only in one direction and also represents only the Capacity 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 & DataTraffic split between Voice & DataThroughput 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 MbpsRNC upgrade from 196 – 400 Mbps

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 RNCVoice Channels - 16 kbps in RNC

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 InterfaceIur carried over Iu Interface

RNCBS

GGSN

SGSN

MSC

MGW

BSBS

RNC Region-1

RNCBS

BSBS

RNC Region-2

RNC linked directly for Iur connection

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

Interface Ports on RNCInterface Ports on RNCTotal Traffic (Iub + Iu + Iur) must be considered to calculate the interface Requirement in RNC.

50 Node B- DU

50 X 0.33 E1

50 Node B- DU

50 X 0.66 E1

80 Node B- U

80 Node B- U

80 X 0.44 E1

80 X 0.88 E1

Daisy Chain Configuration

Interface Ports on RNCInterface Ports on RNC

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 = 192What is the Solution

AXCAXC

AXC

AXC

1 X STM1

1 X STM11 X STM1

Introduce Multiplexing Equipment to Groom the Traffic

RNC Dimensioning CriteriaRNC Dimensioning CriteriaNokia’s Dimensioning criteria for RNC

• Throughput• Carriers• Node B

Some Operators specify RNC to be dimensioned based on -

• Subscribers

• Number of Soft Handovers

• Cell broadcast message

• UE Positioning Request

• Number of Hard Handovers

• Iub, Iu, Iur and O&M Traffic

RNCNode B

ATM Transmission Medium

ATM Overhead in RNCATM Overhead in RNC

ATM OH added at NIU

ATM OH stripped off at 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.

Dimensioning Exercise Dimensioning Exercise

Objective

• Dimension the Interfaces Iub, Iu & Iur

• Determine the number of RNCs required

• Understand the output format from an IP Planner

Case StudyCase Study

3G RAN Network Dimensioning for an Operator in Singapore

SINGAPORE

Case StudyCase Study

Singapore classified in to four different regions Dense Urban Urban Suburban

Rural

DU UU SUSU

Indoor considered to be with in Dense Urban

.

.

.

.

.

.

.

.

..

. .

.

.

Inputs from OperatorInputs from Operator

Subscriber Information

Subscribers Phase 1 Phase 2 Phase 3

Dense Urban 17477 45567 82478Urban 15421 49055 109027Suburban 1495 7674 20811Rural 5607 32703 72685Total 40000 135000 285000

Services to be offered

Circuit Switched • Voice 12.2 kbps• CS Data 14.4 kbps• CS Data 64 kbps

Packet Switched• PS Data 16 kbps• PS Data 64 kbps• PS Data 128 kbps• PS Data 384 kbps

PS 16 kbps UL, kbps/sub

Phase 1 Phase 2 Phase 3PS 16

kbps DL, kbps/sub

Phase 1 Phase 2 Phase 3

kbps/sub kbps/subDense Urban 0.1760 0.2372 0.2778 Dense Urban 0.0176 0.0237 0.0278Urban 0.3911 0.3954 0.3704 Urban 0.0391 0.0395 0.0370Suburban 0.1956 0.2175 0.2223 Suburban 0.0196 0.0217 0.0222Rural 0.2347 0.2768 0.2963 Rural 0.0235 0.0277 0.0296

PS 64kbps UL, kbps/sub


kbps DL, kbps/sub



PS 128kbps UL, kbps/sub


kbps DL, kbps/sub



PS 384 kbps UL, kbps/sub


kbps DL, kbps/sub



CS Voice 12.2 Phase 1 Phase 2 Phase 3mE/sub

27.0 32.0 56.0

CS Data 14.4 Phase 1 Phase 2 Phase 3mE/sub

4.0 8.0 10.0

CS Data 64 Phase 1 Phase 2 Phase 3mE/sub

0.0 0.0 8.0

Traffic for different ServicesTraffic for different Services

Radio Planning OutputRadio Planning Output

Region Base Station Type Phase 1 Phase 2 Phase 3Dense 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

ADD ATM OH for Voice 73%

Taking into account only

67% of traffic due to DTX.

Multiplied by AMR data rate of

12.2 kbps

Adding SHO factor of 40%

Using Erlang B Table with Blocking

probability of 2%

Voice Traffic of 27mErl multiplied

by the subs.

Dense Urban Urban Suburban Rural

Subs and BTS Sites BTS Configuration 111 111 111 111Number of Sites 145 302 131 100Total Number of Sites 145 302 131 100

CS VoiceNo of Subs 17,477 15,421 1,495 5,607Total Subs / BS 120.53 51.06 11.41 56.07Total Erl / BS 3.25 1.38 0.31 1.51Phy CH Req. 8 5 3 5SHO 11.20 7.00 4.20 7.00Bit Rate (Kbps) 136.64 85.40 51.24 85.40DTX 91.55 57.22 34.33 57.22Bit Rate (Kbps)+ATM O_H 158.38 98.99 59.39 98.99

Phase 1

Iub Calculation Iub Calculation CS Voice TrafficCS Voice Traffic

Voice + CS Data + 1% Sig OH in

MSC

ADD ATM OH for CS Data 25%

Multiplied by data rate of 144 kbps


Using Erlang B Table with Blocking

probability of 2%

CS Data of 4mErl multiplied by the

subs.

Iub CalculationIub CalculationCS Data TrafficCS Data Traffic

Dense Urban Urban Suburban RuralCS Data @ 14.4 kbpsSimultaneous Subscribers 7119 13959 677 3046Subscribers per BS 49.10 46.22 5.17 30.46Total Erl / BS 0.20 0.18 0.02 0.12Phy CH Req 2 2 2 2SHO 2.80 2.80 2.80 2.80Bit Rate (Kbps) 40.32 40.32 40.32 40.32Bit 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 49.59Total CS Traffic + Sig.OH 210.05 150.07 110.08 150.07

26.5% OH for retransmission &

bufferingADD ATM OH for PS Data 16 kbps

58%


PS 16 kbps data traffic. Max of UL

or DL

Total CS Traffic + Sig.OH 210.05 150.07 110.08 150.07

Iub Calculation Iub Calculation PS Data Traffic (16 kbps)PS Data Traffic (16 kbps)

PS Data 16 KbpsSimultaneous Subscribers 17477 15421 1495 5607Subscribers per BTS site 120.53 51.06 11.41 56.07Data Rate Kbps 21.21 19.97 2.23 13.16L1 Data Rate Kbps 28.28 26.63 2.98 17.55SHO 39.60 37.28 4.17 24.56Bit Rate (Kbps) + O_H 62.56 58.90 6.58 38.81

ADD ATM OH for PS Data 64 kbps

33%

PS 64 kbps data traffic. Max of UL

or DL

Total CS Traffic + Sig.OH 210.05 150.07 110.08 150.07


Total PS Data 16 kbps 62.56 58.90 6.58 38.81

33% OH for retransmission &

bufferingAdding SHO factor of 40%

PS Data 64 kbpsSimultaneous Subscribers 17477 15421 1495 5607Subscribers per BTS site 120.53 51.06 11.41 56.07Data Rate Kbps 20.26 19.07 2.13 12.57L1 Data Rate Kbps 27.01 25.43 2.84 16.75SHO 37.82 35.60 3.98 23.46Bit Rate (Kbps) + O_H 50.30 47.35 5.29 31.20

ADD ATM OH for PS Data 64 kbps

30%

PS 128 kbps data traffic. Max

of UL or DL 33% OH for

retransmission & buffering



Total CS Traffic + Sig.OH 210.05 150.07 110.08 150.07Total PS Data 16 kbps 62.56 58.90 6.58 38.81Total PS Data 64 kbps 50.30 47.35 5.29 31.20

PS Data 128 kbpsSimultaneous Subscribers 17477 15421 1495 5607Subscribers per BTS site 120.53 51.06 11.41 56.07Data Rate Kbps 74.55 70.19 7.84 46.24L1 Data Rate Kbps 99.40 93.58 10.46 61.66SHO 139.15 131.01 14.64 86.32Bit Rate (Kbps) + O_H 180.90 170.32 19.03 112.22

Total Iub + 10% Signalling OH

Iub Calculation Iub Calculation

Total CS + PS Total CS Traffic + Sig.OH 210.05 150.07 110.08 150.07Total PS Data 16 kbps 62.56 58.90 6.58 38.81Total PS Data 64 kbps 50.30 47.35 5.29 31.20Total PS Data 128 kbps 180.90 170.32 19.03 112.22Total 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



12.2 kbps

Using Erlang B Table with

Blocking prob of 0.5%

Total Voice Traffic

irrespective of No of BS as in Iub

Iu Calculation Iu Calculation Iu CS Voice Iu CS Voice

CS VoiceNo of Subscribers 17477 15421 1495 5607Total V_Erl (Erl) 471.88 416.37 40.37 151.39CSV_CH 508 451 56 176Total Voice in kbps 6197.6 5502.2 683.2 2147.2Total traffic + O_H Mbps 10.72 9.52 1.18 3.71

Note : No Soft Handover in Iu interface.

Voice with DTX + CS Data & 1&

Sig in MSC



12.2 kbps

Using Erlang B Table with

Blocking prob of 0.5%

Total CS Data Traffic

irrespective of No of BS as in Iub

Iu Calculation Iu Calculation Iu CS Data Iu CS Data

CS Data @ 14.4 KbpsSubscribers 7119 13959 677 3046Total V_Erl (Erl) 28.48 55.84 2.71 12.18CSD_CH 42.00 73.00 8.00 22.00Total CS Data in kbps 604.80 1051.20 115.20 316.80Total 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 0.39RNC ---> MSC Mbps 8.01 7.75 0.94 2.91

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

Add 1% Signalling OH in

SGSN

Add IP/ATM Traffic OH based on Packet size

Total PS Data of all services. Max

of UL/DL

Iu Calculation Iu Calculation Iu PS Data Iu PS Data

Iu PS TrafficRNC to SGSN Traffic 16.82 14.84 1.44 5.40PD Traffic + O_H Mbps 18.67 16.48 1.60 5.99Traffic 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


Projected Time Schedule

Phases Roll Out RNC

Phase 1 2H 2002Phase 2 2H 2003Phase 3 2H 2004

196 Mbps196 Mbps400 Mbps

What Release of RNC to be proposed ?


Total Traffic without ATM

Overhead

Note: ROC BS Type for DU

which is only 1 Carrier

Addl Traffic after deducting the

capacity of RNC in Phase2

Area BS Type #Sites (BS)Total Iub per site

Total BS trafficto RNC

Total RNCTraffic (Mbps)

Total Carriers

(Mbps) Mbps

Phase 1 216.5 1,744DU 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

678Phase 2 897.4 3,705DU 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

1235Phase 3 3893.6 5,562DU 111 215 6.4 1,005.36 U 111 900 2.8 1,863.35 SU 111 429 0.9 295.42 Addl TrafficRural 111 310 3.2 729.50 2982.4

1854

Fill Rate of 80% Used

# RNC LimitedCarriers

Required # of RNC

FullConfig on Last RNC

1.89 1.38 2.21 2.21 2 1 0 3

#RNC Limited by NodeB

# RNC LimitedProcessing Capacity

RNC 1

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

3

4

51

2

3

4

5

X 5

1

2

3

4Phase 2 Configuration

1

2

3

4

5

X 5

1

2

3

4Phase 3 Config

X 10 - 400 Mbps

A0002 3g Interfaces RNC Dimensioning

Documents

radio network

dns dhcp radius

ps domain

dl retransmission

aal2 atm phy

circuit switched

iu interface

node bfpwcdma