Huawei CS Fallback(CSFB) Solution
Author/ Email: lihaifeng/mac.li@huawei.com
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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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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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
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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
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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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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
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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
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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
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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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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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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
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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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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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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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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
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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
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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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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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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.
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conditions
Deployment
Procedure
Performance
Satisfied Performance From an European Live Network
3GPP R8 redirection based with fallback to 3G
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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
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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)
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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
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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
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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.
Huawei Confidential
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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