Huawei CS Fallback(CSFB) Solution vTraining.pdf

Huawei CS Fallback(CSFB) Solution Author/ Email: lihaifeng/[email protected] Version: v1.8(20130425) HUAWEI TECHNOLOGIES CO., LTD.

Content 

Why CS Fallback



CS Fallback Solution Overview



Flexible Deployment in Core Network



Successful Story

Major Deployment Options of LTE Voice VoLTE (LTE for data & voice)

LTE voice solution

IMS based LTE voice

• Rich services experience

Provide voice service based on LTE network, support inter-work with 2G/3G

• Less connection time than CS • >3 times frequency efficiency

CS fallback

• Fast supply basic voice service for LTE users • Longer connection time

Attach LTE first, switch to CS for voice

Reuse CS （LTE for data only）

SVLTE Attach to 2G/3G & LTE simultaneously, 2G/3G for voice

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• Less impact to network • High cost & power consumption of terminal • Traditional service in CS

Page 3

Content 

Why CS Fallback



CS Fallback Solution Overview



Flexible Deployment in Core Network



Successful Story

CS Fallback Solution Overview Terminal • CSFB capable terminal

LI

Billing Center

OSS

Radio network • Optional upgrade of BSC/RNC

HLR/HSS Reused

according to CSFB mechanism

Core network

GMSC

VMSC

• Upgrade VMSC to support CSFB MME

S/P-GW

SGs

function. Or deploy CSFB proxy CS

• New SGs interface connect to MME

EPC/PS

Provision • Convergent HLR/HSS for 2G/3G/4G

CS fallback

user is recommended.

GERAN/UTRAN

LTE

• No change to LI and charging Renewed

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Page 5

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

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Surging Smart Phones Capable of CS Fallback

HTC Raider™ 4G LTE smart-phone

HTC Vivid LTE smart-phone

LG Nitro LTE smart-phone

Arrows X LTE F-05D

700MHz/AWS

2100MHz

iPhone 5 700/AWS/2.6GHz

700MHz/AWS

700MHz/AWS 800/1800/2600MHz NEC Medias LTE N-04D (02-2012)

Pantech HSPA+/LTE smartphone

2100MHz

700/850MHz AWS

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Samsung Galaxy S II /S lll LTE

850MHz LG Optimus LTE smart-phone

2100MHz

700/AWS

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Page 7

2100MHz

850MHz

Various CSFB Mechanisms and Impacts

LTE CSFB to 2G(GERAN)

LTE CSFB to 3G(UTRAN)

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)

•

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.

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Service Provision Overview Provision system USIM data

Convergent HSS 4G user data

2G/3G user data

CS data

Routing data

PS data

STP(FNR)

Deploy convergent HSS for all data of 4G user

2G/3G user data

Subscription data provision for 2G/3G/4G

Existing HLR

CS data

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

PS data

Keep existing HLR no change for legacy 2G/3G user HUAWEI TECHNOLOGIES CO., LTD.

Convergent HSS

HLR

EPS data

SIM/USIM data

All data of 4G user

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

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Page 9

Flexible CSFB Deployments in Core Network Huawei innovation

Standard Deployment

Proxy Deployment

SGs

SGs

upgrade

MME

MME CSFB Proxy

Existing MSCs

Enhanced MSCs with CSFB

Existing MSCs

• 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

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FOR ATCA MSC ONLY

Flexible Evolution Protect Your Investment Pre-VoLTE

VoLTE

ICS

Standard deployment

IMS

EPC EPC

• Enhanced MSCs with CSFB

IMS

+

• Enhanced with SRVCC/MGCF/VIG

Pre-VoLTE

EPC

• Enhanced MSCs with mAGCF

VoLTE

IPX

Proxy deployment IMS EPC MGW MSCs • Deploy MSC-S as CSFB proxy

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EPC

MSCs

+

CS/EPC/IMS /PSTN/… MGW MSCs

• Enhanced with SRVCC/MGCF/VIG

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• Enhanced with GMSC/IBCF/IBGF/ISBC

Page 11

End-to-end Multi-vendor

C/D

A/Iu

Um/Uu

Comprehensive integration experiences ensure fast TTM MSC

RAN

S6a

S1

LTE-Uu

SGs

CSFB UE

LTE

Interface

Equipment Vendor(Partial)

SGs

MME

Huawei, Cisco, Ericsson, NSN

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/LTEUu

UE

Huawei(P1/D1), Apple(iPhone 5), Samsung(Galaxy II/III), HTC

MME

HLR/HSS

Reference(Partial)

Mechanism 3GPP R8 Redirection

Malaysia

Hongkong

Netherlands

Saudi Arabia

Norway

South Africa

Russia

Saudi Arabia

China

The interfaces are same for both CSFB and CSFB Proxy deployment HUAWEI TECHNOLOGIES CO., LTD.

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Page 12

Call Setup Time Reference (R8)

Under CSFB standard deployment

2G calls 2G, no fallback

Reusing

2G

6.06 s 2.79

4G calls 2G, fallback to 2G

8.85 s 5.58

4G calls 4G, fallback to 2G

3G calls 3G, no fallback Reusing

3G

4G calls 3G, fallback to 3G

4G calls 4G, fallback to 3G

11.64 s

4.85 s 1.02

5.87 s

2.02

6.87 s

Note:

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

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

Page 13

Call Setup Time Reference (R9)

Under CSFB standard deployment

2G calls 2G, no fallback

Reusing

2G

6.06 s 0.79

4G calls 2G, fallback to 2G

6.85 s

1.58

4G calls 4G, fallback to 2G

7.64 s

3G calls 3G, no fallback Reusing

3G

4G calls 3G, fallback to 3G

4G calls 4G, fallback to 3G Note:

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

4.85 s 0.64

5.49 s

1.24

6.09 s

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

Page 14

Content 







Why CS Fallback CS Fallback Solution Overview

Standard Deployment Option 1 SGs

Flexible Deployment in Core Network Successful Story

upgrade Existing MSCs

MME Enhanced MSCs with CSFB

Deployment

Procedure

CSFB Standard Deployment in CS

HLR(2G/3G)

HSS (4G)

Deployment principle STP(FNR)

CS core network 

C/D

Upgrade all MSC Server in Pool to the target software version



All MSC Servers enable CSFB function to

SGs

VMSC

support both CS and CSFB user access

A/Iu

HLR/HSS 

Deploy convergent HSS for 4G user to get a

BSC/RNC

simple user data management 

Keep existing HLR no change



Use STP with FNR function to select HLR or

BTS eNodeB

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

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MME

Deployment

Procedure

SGs Associated Location Update Convergent HSS

MSS1

General routingin MME • TA1 -> LAI1 -> MSS1 • TA2 -> LAI1 -> MSS1 • TA3 -> LAI2 -> MSS2

MSS2

Insert user data 2

Routing towards MSC pool • IMSI Hash -> MSS x

Location update

MME MME

MSC

TA1

SGs

TA2

TA3

EPC

CS

LAI1 1

LAI2

TAU Request

LTE

CSFB capable LTE terminal

• 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

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Deployment

Procedure

Basic Call Procedure 1

MME

MSC

SGs

SGs EPC

CS 3

4

LTE

MO Procedures • UE receive fallback indication after CS service request • UE fallback to 2G/3G • UE initiate CS service request as normal CS procedure

2

2G/3G

LTE 3

2

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EPC

CS

1

2G/3G

MME

MSC

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

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Page 18

Deployment

Procedure

Basic SMS Procedure SMC/SMC-Gateway

SMC

SMS over SGs

MSC

MME

SMS over SGs

MSC

SGs

SGs

LTE

LTE

• Originating SMS over SGs without fallback procedure

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EPC

CS

EPC

CS

MME

• Terminated SMS over SGs without fallback procedure

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Page 19

Deployment

Procedure

MTRF Improves Call Complete Rate for CSFB calls HLR

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

5. Location Update

6. Cancel Location

Description VMSC1 1. IAM(MSRN)

• 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.

4.Send Identification(*1) VMSC2

7. PRN(*2)/RSP 8. IAM 3.Location update

2.Paging via SGs

LAI1

Benefits

9.Paging

• Call complete rate(CCR) is improved for CSFB call • Better user experience

LAI2

CSFB call received on borders

MTRF(MSC mode) required on MSC only:

MTRF(HLR mode) required on both MSC and HLR:

*1: MTRF supported flag and New MSC/VLR number contained in G interface *2: MTRF indicator flag and Old MSC number contained

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

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Deployment

Procedure

Fast Return to LTE at the end of CSFB call Without fast return PS CSFB

Release call with CSFB indication LTE

PS Ready CS call

cell reselection

PS CSFB

GSM/UMTS

8s after UE idle with unreachable time

With fast return

Direct access

LTE

PS Ready

LTE

GSM/UMTS

CS call

frequency info. G/U

500ms after CS call

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)

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Deployment

Procedure

CSFB Backup and Recovery CSFB MSC

MME

PRN Convergence HSS/HLR

SGs paging Paging

MSC Pool

SGs

MME Pool

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

CS

EPC PRN SGs paging

RAN(2G/3G/4G)

Paging

High reliable networking for CSFB

Fault case 2: MME down

MSC Pool networking with real time backup of CSFB users

CSFB MSC reselect normal MME for terminated call

MME pool networking Immediate terminated call recovery in down time of CSFB/MME

VLR Real-time Backup HUAWEI TECHNOLOGIES CO., LTD.

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Content 

Why CS Fallback Proxy Deployment



CS Fallback Solution Overview

Option 2



Flexible Deployment in Core Network



Successful Story

+ Existing MSCs

SGs

CSFB Proxy

MME

Deployment

Procedure

Performance

CSFB Proxy, the most efficient way to initiate LTE voice Low TCO

HSS/HLR

• Deploy one MSC-S(no MGW) as CSFB Proxy • Evolve to SRVCC-IWF/MGCF in VoLTE phase

MSC-Server (as CSFB Proxy) SGs

CS

MME Pool

Fast TTM • Least impacts to existing CS, reusing BOSS, LI • Fastest 1 month

EPC

Full service inheritance RAN(2G/3G/4G)

• Fallback to existing CS for services handling • Free of worry

CSFB Proxy Network topology

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Page 24

Deployment

Procedure

Performance

SGs Associated Location Update Convergent HSS

CSFB MSS with common fake LAI

Routing policies in MME

Insert user data 2

• All TA -> common fake LAI -> CSFB MSS

Location update

MME CSFB proxy

VMSC

MME

TA1

SGs

TA2

TA3

EPC

CS

LAI1 1

LTE

CSFB capable LTE terminal

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LAI2

TAU Request •

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

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Page 25

Deployment

Procedure

Performance

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.

HLR MME

VMSC

CSFB proxy SGs EPC

CS

2G/3G

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LTE

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Page 26

Deployment

Procedure

Performance

Basic MT Call Procedure for Native User HLR

Proxy MME GMSC

SAE GW

VMSC

EPC

• 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 No requirements on the existing MSC and HLR Difficult in implementing 2nd SRI in international scenario

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Deployment

Procedure

Performance

Optimized MT Call Procedure for Native User Optimization required

HLR

Proxy MME GMSC

SAE GW

VMSC

EPC

• 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 2nd SRI procedure is avoided, optimized delay Fast service launch in international roaming scenario HUAWEI TECHNOLOGIES CO., LTD.

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Page 28

Deployment

Procedure

Performance

Basic SMS Procedure SMC/SMC-Gateway

SMC

SMS over SGs

Proxy

MME

SMS over SGs

Proxy

SGs

SGs

EPC

CS

EPC

CS

LTE

LTE

• Same procedure with that in standard deployment • Proxy can provide the SMS charging and LI service if not provided in SMSC HUAWEI TECHNOLOGIES CO., LTD.

MME

• Same procedure with that in standard deployment • Proxy can provide the SMS charge and LI service if not provided in SMSC

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Page 29

Deployment

Procedure

Performance

CSFB Proxy Backup and Recovery CSFB Proxy

MME

PRN Convergence HSS/HLR

SGs paging Paging

VLR Real-time Backup

Fault case 1: CSFB Proxy down HLR route terminated call to normal CSFB Proxy

SGs

CS

MME Pool

CSFB Proxy route the call to MME according to backup information

EPC PRN SGs paging

RAN(2G/3G/4G)

Paging

High reliable networking for CSFB 1+1 load share of CSFB Proxy with real time backup of CSFB users MME pool networking

Fault case 2: MME down CSFB Proxy reselect normal MME for terminated call

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

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Page 30

Deployment

Procedure

Performance

E2E well-proven optimizations ensure better user experience Optimization overview

CSFB Call additional procedure

Normal Call

MO Location Update

MO Fallback

7

2~6

MT Fallback

8

MT Location Update

Paging (4G)

MO Fallback

MT Fallback

MO/MT

2~6

7,8

Dual Fallback

1

Optimization Point

2~6

1

2~6

1

1

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 Page 31 Huawei Confidential and it does NOT represent with necessary optimization, any commitment.

HUAWEI TECHNOLOGIES CO., LTD. conditions

Deployment

Procedure

Performance

Satisfied Performance From an European Live Network

3GPP R8 redirection based with fallback to 3G HUAWEI TECHNOLOGIES CO., LTD.

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Page 32

Deployment

Procedure

Performance

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

Single call

Fast return LTE

5s 5s CSFB

3G

Download movie

3G

• calls 117 when downloading • the downloading goes on

7s

117 Time service CSFB

117

3G

• Same call experience • A user is not aware of the fallback Note: adopt 3GPP R8 redirection based CSFB, fall back to 3G HUAWEI TECHNOLOGIES CO., LTD.

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Page 33

Content 

Why CS Fallback



CS Fallback Solution Overview



Flexible Deployment in Core Network



Successful Story

Worldwide References References for CSFB Standard Deployment

Hongkong

Malaysia

CMHK

Kuwait

Philippine

Saudi Arabia

Saudi Arabia

Namibia

Philippine Smart Norway

UAE

Russia

South Africa

Venezuela

Sri Lanka

Thailand BFKT

Sri Lanka Dialog

Russia

Paraguay Tigo

References for CSFB Proxy Deployment

Netherlands

Saudi Arabia

Romania

Colombia

Spain

Oman

Mexico

Oman

Total projects operating: 75 (Standard deployment: 35, Proxy deployment:33) HUAWEI TECHNOLOGIES CO., LTD.

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Page 35

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 comparing with that in Kuwait OPCO Pageby36 HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

Commercial CSFB in Hong Kong PCCW (Feb. 2012) 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

Convergent HSS (4G)

C/D

SGs

MSC POOL

BSC/RNC

Benefits BTS

• Fast deployment in 1 month, short TTM

eNodeB

• 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.

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Page 37

MME

KPN, Step Forward Confidently with Huawei KPN awards Huawei a bonus for excellent delivery CSFB Proxy Existing CS

EPC

• Fast TTM(in 3 months) • Fast Fallback to CS • Fast Return to LTE

Case DNA 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. 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. 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 HUAWEI TECHNOLOGIES CO., LTD.

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Page 38

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.

Deployment

Procedure

Performance

Call Setup Time Reference for CSFB Proxy (R8) Evaluation required for commercial launch 2G calls 2G, no fallback

Reusing

2G

6.06 s 5.76

4G calls 2G, fallback to 2G

8.17

4G calls 4G, fallback to 2G

3G calls 3G, no fallback Reusing

4G calls 3G, fallback to 3G

Note:

14.23 s

4.85 s 2.22

7.07 s

3G 4G calls 4G, fallback to 3G

11.82 s

4.61

9.46 s

Source from Huawei lab under conditions: 3GPP Rel8 redirection, CSMT, etc. The latency information contained in this document depends on end-to-end network conditions with necessary optimization, and it should NOT represent any Page 40 HUAWEI TECHNOLOGIES CO.,commitment. LTD. Huawei Confidential

Deployment

Procedure

Performance

Call Setup Time Reference for CSFB Proxy (R9) 2G calls 2G, no fallback

Reusing

2G

6.06 s 3.76

4G calls 2G, fallback to 2G

4.17

4G calls 4G, fallback to 2G

3G calls 3G, no fallback Reusing

4G calls 3G, fallback to 3G

Note:

10.23 s

4.85 s 1.84

6.69 s

3G 4G calls 4G, fallback to 3G

9.82 s

4.23

9.08 s

Source from Huawei lab under conditions: 3GPP Rel9 redirection, CSMT, etc. The latency information contained in this document depends on end-to-end network conditions with necessary optimization, and it should NOT represent any Page 41 HUAWEI TECHNOLOGIES CO.,commitment. LTD. Huawei Confidential