HUAWEI TECHNOLOGIES CO., LTD.

Huawei CS Fallback(CSFB) Solution

Author/ Email: lihaifeng/mac.li@huawei.com

Version: v1.8(20130425)

Content

Why CS Fallback

CS Fallback Solution Overview

Flexible Deployment in Core Network

Successful Story

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 3

Major Deployment Options of LTE Voice

• Rich services experience

• Less connection time than CS

• >3 times frequency efficiency

• Fast supply basic voice service for

LTE users

• Longer connection time

• Less impact to network

• High cost & power consumption

of terminal

• Traditional service in CS

LTE voice solution

VoLTE (LTE for data & voice)

Reuse CS （LTE for data only）

IMS based LTE voice Provide voice service based on

LTE network, support inter-work

with 2G/3G

CS fallback Attach LTE first, switch to CS

for voice

SVLTE Attach to 2G/3G & LTE

simultaneously, 2G/3G for voice

Content

Why CS Fallback

CS Fallback Solution Overview

Flexible Deployment in Core Network

Successful Story

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 5

CS Fallback Solution Overview

GERAN/UTRAN

HLR/HSS

S/P-GW MME

GMSC

SGs

LTE

OSS LI Billing Center

Terminal

• CSFB capable terminal

Radio network

• Optional upgrade of BSC/RNC

according to CSFB mechanism

Core network

• Upgrade VMSC to support CSFB

function. Or deploy CSFB proxy

• New SGs interface connect to MME

Provision

• Convergent HLR/HSS for 2G/3G/4G

user is recommended.

• No change to LI and charging

VMSC

CS fallback

CS EPC/PS

Reused

Renewed

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 6

NEs List in CSFB Deployment

NE Function Description

HSS/HLR Support 2G/3G/4G subscription data. Convergent HSS for 2G/3G/4G recommended to get a simple user data

management

MSC Support CSFB function, or deploy a new MSC as CSFB proxy

SGSN No requirements if using R8 Redirection fallback mechanism

RNC/BSS

1. Support sending the page response to MSC when the page request sent by MME, not through the BSC/RNC

2. Support 3GPP R8 phase and can broadcast 4G adjacent area information

3. Fast return to LTE after CS service is recommended to be triggered by BSC/RNC for better user experience

SCP/RBT/SMC NA

STP Support FNR(flexible number routing) function while using different HLR/HSS for 2G/3G and 4G user

MME All the new MME should support CSFB and select a MSC in the Pool base on IMSI-Hash

eNodeB Support CSFB function and R8 redirection fallback mechanism in blind mode at least

Provision

1. Support sending data to HSS or HLR based on the user’s type. If the user is 4G, the data should send to HSS and

STP with FNR. if the user is 2G/3G ,the data should send to HLR

2. Delete the 3G /2G data in HLR when user upgrade to 4G in HSS

3. Reuse existing CS for LI and charging

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 7

HTC Raider™ 4G LTE smart-phone

Samsung Galaxy S II /S lll LTE

HTC Vivid LTE smart-phone

LG Optimus LTE smart-phone NEC Medias LTE N-04D

(02-2012)

2100MHz 700/AWS/2.6GHz 700MHz/AWS

700/AWS 850MHz 2100MHz 2100MHz

850MHz

2100MHz

700MHz/AWS

800/1800/2600MHz

LG Nitro LTE smart-phone

700MHz/AWS

Arrows X LTE F-05D

700/850MHz AWS

Pantech HSPA+/LTE smart-phone

Surging Smart Phones Capable of CS Fallback

iPhone 5

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 8

Various CSFB Mechanisms and Impacts

CSFB

Mechanism

Impacts on

UTRAN/GERAN Impacts on PS

Impacts on

terminal

Impacts on CS

core Network

R8 CCO with

NACC Yes Yes Yes No(1)

PS Handover Yes Yes Yes No(1)

R8 redirection No No Yes No(1)

R9 redirection

with SIB Yes Yes Yes No(1)

LTE CSFB to

2G(GERAN)

LTE CSFB to

3G(UTRAN)

• Different mechanisms result in different call set-up delays and deployment

• 3GPP R8 redirection recommended for fast deployment without extra requirements on BSC/RNC

• 3GPP R9 redirection with SIB(2) and PSHO recommended considering less latency

Note: 1.the various mechanism s are transparent towards CS core

2.3GPP R9 redirection also known as Flash CSFB in Huawei RAN solution

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 9

Service Provision Overview

USIM data

CS data

PS data

EPS data

4G user data

Convergent HSS

SIM/USIM

data

CS data

PS data

2G/3G user data Existing HLR

Convergent HSS

Provision system

HLR

STP(FNR)

2G/3G user data All data of 4G user

Routing data

Deploy convergent HSS for all data of 4G user

Keep existing HLR no change for legacy 2G/3G user

Subscription data provision for 2G/3G/4G 1. Provision system send data to HSS or HLR based on the user’s type. For 4G

user, all data is sent to HSS, for 2G/3G user, the data is sent to HLR

2. 2G/3G data in HLR is deleted when user upgraded to 4G

Flexible Number Routing for CSFB provisioning 1. STP should be enhanced with flexible number routing between 2G/3G(including

fallback user) and 4G user

2. Routing data is updated to STP when 4G user provisioning

3. STP route service message to HLR or HSS based on FNR

4. Support 4G migration without changing number in 2G/3G with FNR

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 10

Flexible CSFB Deployments in Core Network

• Upgrade all MSCs and enhanced with CSFB

• Expensive cost and heavy upgrade work in some cases

• The user experience is better for less latency

• Introduce new MSC as CSFB Proxy

• Fast deployment and shorten time-to-market

• A simple approach for 4G only operator to provide LTE voice

Operator has the flexible choice to realize the CSFB deployment

Existing MSCs Enhanced MSCs

with CSFB

upgrade MME

Standard Deployment

SGs

Existing MSCs CSFB Proxy

MME

Proxy Deployment

SGs

Huawei innovation

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 11

Flexible Evolution Protect Your Investment

• Enhanced MSCs with CSFB

EPC

• Enhanced with SRVCC/MGCF/VIG

• Enhanced MSCs with mAGCF

EPC

• Deploy MSC-S as CSFB proxy

EPC

Pre-VoLTE

MSCs

• Enhanced with SRVCC/MGCF/VIG

EPC

MSCs

• Enhanced with GMSC/IBCF/IBGF/ISBC

MSCs

IMS

IMS

EPC

IMS

VoLTE ICS

Pre-VoLTE VoLTE IPX

CS/EPC/IMS

/PSTN/…

MGW MGW

+

+

Standard deployment

Proxy deployment

FOR ATCA MSC ONLY

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 12

Comprehensive integration experiences ensure fast TTM

MSC C/D

SGs

S6

a

A/I

u

S1

Um

/Uu

LT

E-U

u

Interface Equipment Vendor(Partial) Reference(Partial) Mechanism

SGs MME Huawei, Cisco, Ericsson, NSN 3GPP R8 Redirection

C/D HLR(HSS) Huawei, Ericsson, NSN

S6a HSS Huawei, Ericsson, NSN

A/Iu BSC/RNC Huawei, Ericsson, NSN

S1 eNodeB Huawei, Ericsson, NSN

Um/Uu/LTE-

Uu

UE Huawei(P1/D1), Apple(iPhone 5),

Samsung(Galaxy II/III), HTC

End-to-end

Multi-vendor

CSFB UE LTE MME HLR/HSS

The interfaces are same for both CSFB and CSFB Proxy deployment

RAN

Russia

Saudi Arabia Norway

Saudi Arabia

Malaysia

South Africa

Hongkong Netherlands

China

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 13

Call Setup Time Reference (R8)

6.06 s

8.85 s

11.64 s

4.85 s

5.87 s

6.87 s

2G calls 2G, no fallback

4G calls 2G, fallback to 2G

4G calls 4G, fallback to 2G

3G calls 3G, no fallback

4G calls 3G, fallback to 3G

4G calls 4G, fallback to 3G

2.79

5.58

1.02

2.02

Reusing

2G

Reusing

3G

Source from Huawei lab under conditions: 3GPP Rel8 redirection, etc.

Under CSFB standard deployment

Note:

The latency information contained in this document depends on end-to-end network conditions with necessary optimization, and it should NOT represent any commitment.

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 14

Call Setup Time Reference (R9)

6.06 s

6.85 s

7.64 s

4.85 s

5.49 s

6.09 s

2G calls 2G, no fallback

4G calls 2G, fallback to 2G

4G calls 4G, fallback to 2G

3G calls 3G, no fallback

4G calls 3G, fallback to 3G

4G calls 4G, fallback to 3G

0.79

1.58

0.64

1.24

Reusing

2G

Reusing

3G

Source from Huawei labunder conditions: 3GPP Rel9 redirection, etc.

Under CSFB standard deployment

Note:

The latency information contained in this document depends on end-to-end network conditions with necessary optimization, and it should NOT represent any commitment.

Content

Why CS Fallback

CS Fallback Solution Overview

Flexible Deployment in Core Network

Successful Story

Existing MSCs Enhanced MSCs

with CSFB

upgrade MME

Standard Deployment

SGs

Option 1

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 16

CSFB Standard Deployment in CS

Deployment principle

CS core network

Upgrade all MSC Server in Pool to the target

software version

All MSC Servers enable CSFB function to

support both CS and CSFB user access

HLR/HSS

Deploy convergent HSS for 4G user to get a

simple user data management

Keep existing HLR no change

Use STP with FNR function to select HLR or

HSS for 2G/3G/4G(fallback user)

Deployment Procedure

BSC/RNC

eNodeB

MME SGs

BTS

VMSC

A/Iu

STP(FNR)

HLR(2G/3G) HSS (4G)

C/D

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 17

SGs Associated Location Update

TA1 TA2

LAI1

MSS1

MME

LAI2

TA3

MSS2

MME

SGs

LTE

1

Location update 2

TAU Request

Convergent

HSS

MSC

CS EPC

General routingin MME

• TA1 -> LAI1 -> MSS1

• TA2 -> LAI1 -> MSS1

• TA3 -> LAI2 -> MSS2

Routing towards MSC pool

• IMSI Hash -> MSS x

CSFB capable

LTE terminal

Insert user data

• MME find CSFB VMSC number according to TA-LAI-MSC mapping

• After successful SGs location update, VMSC get ready for later CSFB procedure

• For MSC Pool, MME find VMSC based on IMSI hash table/TMSI in MME

* Only major procedures are presented in this slide for better understanding

Deployment Procedure

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 18

Basic Call Procedure

MME

SGs

LTE

1

MSC

CS EPC

2G/3G

2

3

MO Procedures

• UE receive fallback indication after CS service request

• UE fallback to 2G/3G

• UE initiate CS service request as normal CS procedure

MT Procedures

• MSS send paging over SGs after receiving incoming call

• MME trigger fallback indication

• UE fallback to 2G/3G

• UE send paging response to MSC as normal CS procedure

MME

SGs

LTE

1

MSC

CS EPC

2G/3G

2 4

3

Deployment Procedure

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 19

Basic SMS Procedure

MME

SGs

LTE

SMC

MSC

CS EPC

• Originating SMS over SGs without fallback procedure

MME

SGs

LTE

SMC/SMC-Gateway

MSC

CS EPC

• Terminated SMS over SGs without fallback procedure

SMS over SGs SMS over SGs

Deployment Procedure

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 20

MTRF Improves Call Complete Rate for CSFB calls

LAI1 LAI2

MTRF(MSC mode) required on MSC only: *1: MTRF supported flag and New MSC/VLR number contained in G interface

*2: MTRF indicator flag and Old MSC number contained

VMSC1 VMSC2

HLR

2.Paging via SGs 3.Location update

1. IAM(MSRN)

6. Cancel Location 5. Location Update

4.Send Identification(*1)

7. PRN(*2)/RSP

8. IAM

Description

• When receiving call on the borders of different

MSCs /Pools area, CSFB UE may roam to

neighbor MSC/VLR area, and the previous VMSC

can forward the call to current VMSC with MTRF

function.

Benefits • Call complete rate(CCR) is improved for CSFB call

• Better user experience

CSFB call received on borders

9.Paging

MTRF/MTRR: Mobile Terminated Roaming Forwarding/Retry, CCR: Call Complete Rate

MTRF(HLR mode) required on both MSC and HLR: Location Update: MTRF supported flag contained

Cancel Location: MTRF supported and Authorized flag and New MSC/VLR number contained

Deployment Procedure

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 21

Fast Return to LTE at the end of CSFB call

Direct access

Without fast return

With fast return

PS Ready

CS call cell

reselection

PS Ready

CS call

PS

PS

500ms after CS call

LTE

GSM/UMTS

GSM/UMTS

LTE

8s after UE idle with unreachable time

Description

• At the end of a CSFB call in GSM/UMTS network, the frequency information of LTE cell is sent in RRC Connection Release message

in order to instruct the UE to camp on the LTE cell instead of cell re-selection to LTE.

Benefits

• This feature accelerate the camping back to LTE after voice call release and reduce unreachable time of LTE user

• Avoid the impact to non-CSFB user(e.g. UE may be out of network when trying to access LTE for about 10 seconds)

LTE

G/U

Release call with CSFB indication

frequency info.

CSFB

CSFB

Deployment Procedure

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 22

CSFB Backup and Recovery

RAN(2G/3G/4G)

CS

Convergence

HSS/HLR

MME Pool

EPC

High reliable networking for CSFB

MSC Pool networking with real time backup of CSFB users

MME pool networking

Immediate terminated call recovery in down time of CSFB/MME

PRN

Fault case 1: CSFB MSC down

HLR route terminated call to normal CSFB MSC

CSFB MSC route the call to MME according to backup information

PRN

Fault case 2: MME down

CSFB MSC reselect normal MME for terminated call

SGs paging

Paging

SGs paging

Paging

SGs MSC Pool

VLR Real-time Backup

CSFB MSC MME

Deployment Procedure

Content

Why CS Fallback

CS Fallback Solution Overview

Flexible Deployment in Core Network

Successful Story

Existing MSCs CSFB Proxy

MME

Proxy Deployment

SGs +

Option 2

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 24

CSFB Proxy, the most efficient way to initiate LTE voice

Deployment Procedure Performance

Low TCO • Deploy one MSC-S(no MGW) as CSFB Proxy

• Evolve to SRVCC-IWF/MGCF in VoLTE phase

Fast TTM • Least impacts to existing CS, reusing BOSS, LI

• Fastest 1 month

Full service inheritance • Fallback to existing CS for services handling

• Free of worry RAN(2G/3G/4G)

CS

HSS/HLR

MME Pool EPC

SGs

MSC-Server

(as CSFB Proxy)

CSFB Proxy Network topology

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 25

SGs Associated Location Update

• MME find CSFB MSC number according to TA-LAI-MSC mapping

• After successful SGs location update, CSFB MSC get ready for later

CSFB procedure, and VMSC need extra implicit location update

TA1 TA2

LAI1

CSFB MSS with common fake LAI

MME

LAI2

TA3

MME

SGs

LTE

1

Location update 2

TAU Request

Convergent

HSS

CSFB proxy

CS EPC

Routing policies in MME

• All TA -> common fake LAI ->

CSFB MSS

CSFB capable

LTE terminal

VMSC

Insert user data

Deployment Procedure Performance

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 26

Basic MO Call Procedure

MO Procedures

• UE register to 2G/3G VMSC when fall back to the corresponding

physical LAI area.

• Location update is needed in CSFB proxy procedure and extra

latency is introduced compared with standard CSFB.

MME

SGs

LTE

VMSC

CS EPC

2G/3G

HLR

CSFB proxy

Deployment Procedure Performance

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 27

Basic MT Call Procedure for Native User

• Proxy Send paging over SGs when receiving the PRN from HLR

• LTE terminal fallback and register to VMSC

• Proxy trigger the 2nd SRI procedure when receiving the Cancel

Location from HLR and respond roaming number to GMSC

• Bearer is established bypassing proxy MSC

Deployment Procedure Performance

EPC

MME SAE GW

GMSC VMSC

Proxy

HLR

No requirements on the existing MSC and HLR

Difficult in implementing 2nd SRI in international scenario

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 28

Optimized MT Call Procedure for Native User

Deployment Procedure Performance

• Proxy Send paging over SGs when receiving the PRN from HLR,

and trigger the fallback of MS from LTE to 2G/3G

• LTE terminal register to VMSC and HLR, cancel location from proxy

• Proxy trigger PRN procedure directly to VMSC and respond roaming

number to GMSC

• Bearer is established bypassing proxy MSC

HLR

EPC

MME SAE GW

GMSC VMSC

Proxy

2nd SRI procedure is avoided, optimized delay

Fast service launch in international roaming scenario

Optimization

required

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 29

Basic SMS Procedure

MME

SGs

LTE

SMC

Proxy

CS EPC

• Same procedure with that in standard deployment

• Proxy can provide the SMS charging and LI service if

not provided in SMSC

MME

SGs

LTE

SMC/SMC-Gateway

Proxy

CS EPC

• Same procedure with that in standard deployment

• Proxy can provide the SMS charge and LI service if not provided

in SMSC

SMS over SGs SMS over SGs

Deployment Procedure Performance

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 30

CSFB Proxy Backup and Recovery

RAN(2G/3G/4G)

CS

Convergence

HSS/HLR

MME Pool

VLR Real-time

Backup

EPC

High reliable networking for CSFB

1+1 load share of CSFB Proxy with real time backup of CSFB users

MME pool networking

Immediate terminated call recovery in down time of CSFB Proxy/MME

PRN

Fault case 1: CSFB Proxy down

HLR route terminated call to normal CSFB Proxy

CSFB Proxy route the call to MME according to backup information

PRN

Fault case 2: MME down

CSFB Proxy reselect normal MME for terminated call

SGs paging

Paging

SGs paging

Paging

SGs

CSFB Proxy MME

Deployment Procedure Performance

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 31

E2E well-proven optimizations ensure better user experience

Optimization overview CSFB Call additional procedure

Normal Call MO Location Update MT Location Update Paging (4G) MO Fallback MT Fallback

MO/MT

MO Fallback 7 2~6 1

MT Fallback 8 2~6 1

Dual Fallback 7,8 2~6 2~6 1 1

Optimization Point Related Field Reduced latency in live network

1 Skip SIBs & SIB schedule adjust UE/RNC 0.7s

2 Skip Send IMSI CSFB Proxy 0.1s

3 Shorten Send authentication VMSC 0.4s

4 Skip check IMEI VMSC or MME

5 Skip TMSI reallocation VMSC 0.2s

6 Shorten Cipher Latency RAN 0.6s

7 Calling party Follow ON VMSC/UE 1.1s

8 Called party with CSMT support UE/VMSC 1.5s

Note: The latency information contained in this document depends on end-to-end network conditions with necessary optimization, and it does NOT represent any commitment.

Deployment Procedure Performance

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 32

Satisfied Performance From an European Live Network

Deployment Procedure Performance

3GPP R8 redirection based with fallback to 3G

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 33

Demo in F5 live center: CSFB Proxy – fast call setup & return

CSFB • calls 117 when downloading

• the downloading goes on

5s

7s

5s

117

Time service

3G 3G

CSFB 3G

• Same call experience

• A user is not aware of the fallback

Single call Concurrent calls Fast return LTE

Download movie

Note: adopt 3GPP R8 redirection based CSFB, fall back to 3G

117

Deployment Procedure Performance

Content

Why CS Fallback

CS Fallback Solution Overview

Flexible Deployment in Core Network

Successful Story

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 35

Worldwide References

References for CSFB Proxy Deployment

References for CSFB Standard Deployment

Hongkong Saudi Arabia

Norway UAE

Saudi Arabia Malaysia

Netherlands

Russia South Africa

Mexico Oman Romania Saudi Arabia

Philippine

Colombia Spain

Namibia

Venezuela

CMHK Kuwait

Sri Lanka

Oman

Russia

Philippine

Smart

Sri Lanka

Dialog

Thailand

BFKT

Paraguay

Tigo

Total projects operating: 75 (Standard deployment: 35, Proxy deployment:33)

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 36

Some customer feedbacks sharing 2012.12 Holland KPN, CSFP Proxy deployment

Dear Victor,

I would like to take this opportunity to formally express my appreciation to you and your team for the effort and excellent

performance within the LTE program of KPN. Furthermore I want to congratulate you and your team with the current result.

During the last couple of months we discussed the performance of the Huawei EPC team on several different management levels

and I want to express how pleased KPN is with the efforts and achievements of the Huawei team.

Huawei delivered the EPC project in the shortest timeline possible. All milestones are met on time or even before the deadline.

The Huawei project team has shown tremendous commitment and perseverance in realizing project targets and requirements and

succeeded in delivering this strategic project for KPN in a very controlled manor.

I am also very pleased by way the Huawei project team members interacted with the KPN project members. All Huawei team

members demonstrated great professionalism and maintained a pleasant constructive attitude during formal and informal

discussions.

I look forward to continue working with Huawei project team in the next steps of the project and I have full confidence we will be

successful again. ---Rob Geurts, Program manager

2013.04 Malaysia Maxis, CSFB standard deployment

MAXIS THE FIRST TO ACTIVATE 4G LTE FOR APPLE DEVICES

All new and existing Maxis customers using iPhone 5, iPad mini and iPad 4 can now enjoy super fast internet on Maxis’ 4G LTE network

“Well done! We are undisputed speed king in Msia and always at forefront of technology. Thank you all for taking this to another level and for making history”

-- CS Yap, Head of Network

2013.03 Saudi Zain, CSFB Proxy deployment

The experience under Huawei CSFB Proxy is better than that in NSN CSFB standard deployment

-- from Zain Group after experience in Saudi OPCO by comparing with that in Kuwait OPCO

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 37

Commercial CSFB in Hong Kong PCCW (Feb. 2012)

MSC POOL

BSC/RNC

eNodeB

MME SGs

BTS

Convergent HSS

(4G)

C/D

HLR

(2G/3G) Field Solution

CS/PS/EPC Huawei

HLR/HSS Huawei

3G/LTE Huawei

LTE terminal SAMSUNG galaxy SII and HTC holiday

CS fallback mechanism R8 redirection

CS deployment Standard deployment(update all MSC to

support CSFB)

HSS deployment Convergent HSS for all data of 4G user

Benefits

• Fast deployment in 1 month, short TTM

• First LTE voice network in Hong Kong telecom market, increasing brand

• Brings successful market(10000sub in 2 months), win the beginning

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 38

Challenges: To win the competition edge, KPN needs to deploy commercial LTE voice network within 3 months

as the surging of smart phones capable of CS fallback.

Case DNA

Huawei solutions: 1 MSS as CSFB Proxy is deployed over the existing core network to meet the TTM, which

has no impacts on existing BSS, OSS and LI.

• Fast TTM(in 3 months)

• Fast Fallback to CS

• Fast Return to LTE

Benefits:

1) Reusing CS to provide voice/SMS service and saving CAPEX in the initial LTE phase

2) Fast launch of LTE voice before commercial VOLTE and win the competition edge

Existing

CS

CSFB Proxy

EPC

KPN awards Huawei a bonus for excellent delivery

KPN, Step Forward Confidently with Huawei

Thank you www.huawei.com

Copyright©2011 Huawei Technologies Co., Ltd. All Rights Reserved.

The information contained in this document is for reference purpose only, and is subject to

change or withdrawal according to specific customer requirements and conditions.

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 40

Call Setup Time Reference for CSFB Proxy (R8)

6.06 s

11.82 s

14.23 s

4.85 s

7.07 s

9.46 s

2G calls 2G, no fallback

4G calls 2G, fallback to 2G

4G calls 4G, fallback to 2G

3G calls 3G, no fallback

4G calls 3G, fallback to 3G

4G calls 4G, fallback to 3G

5.76

8.17

2.22

4.61

Reusing

2G

Reusing

3G

Source from Huawei lab under conditions: 3GPP Rel8 redirection, CSMT, etc.

Deployment Procedure Performance

Evaluation required for commercial launch

Note:

The latency information contained in this document depends on end-to-end network conditions with necessary optimization, and it should NOT represent any commitment.

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 41

Call Setup Time Reference for CSFB Proxy (R9)

6.06 s

9.82 s

10.23 s

4.85 s

6.69 s

9.08 s

2G calls 2G, no fallback

4G calls 2G, fallback to 2G

4G calls 4G, fallback to 2G

3G calls 3G, no fallback

4G calls 3G, fallback to 3G

4G calls 4G, fallback to 3G

3.76

4.17

1.84

4.23

Reusing

2G

Reusing

3G

Source from Huawei lab under conditions: 3GPP Rel9 redirection, CSMT, etc.

Deployment Procedure Performance

Note:

The latency information contained in this document depends on end-to-end network conditions with necessary optimization, and it should NOT represent any commitment.