4G CSFB

1. © 2012 Qualcomm Technologies, Inc. All rights reserved. 1
CSFB Performance
October 2012

2. © 2012 Qualcomm Technologies, Inc. All rights reserved. 2
High-Level Multimode Options for LTE Voice
Long-Term Voice Solution
LTE VoIP Handsets
Initial Launches
Data Devices
Initial Voice Solution
LTE Data Handsets
2G/3G Coverage Continuity and Roaming
LTE for Data Only
LTE for Data
2G/3G for Voice
Simultaneous LTE VoIP
and Rich Data Services
LTE/3G/2G
Multimode
(Redirection,
PS Handover)
Dual-Radio
1x Voice + 4G Data
Circuit Switched
Fallback to 2G/3G
CS Voice and Data
VoLTE with Single Radio
Voice Call Continuity
VT and RCS-Enabled
Services and Apps
+ CSFB for Roaming

3. © 2012 Qualcomm Technologies, Inc. All rights reserved. 3
First Step for LTE Voice Support
Circuit Switched Fallback (CSFB)
 Enables global voice/SMS roaming and interworking for LTE devices
 Fully standardized for 2G and 3G
 Utilizes mature/ubiquitous 2G/3G networks for voice
 Commercially launched across all LTE regions
 Strong global ecosystem
 Reliability comparable to native CS calls
 Subsecond incremental call setup time in live networks
CSFB Enables Single Radio Device Architecture
with Better Cost, Power, and Form Factor

4. © 2012 Qualcomm Technologies, Inc. All rights reserved. 4
3GPP CSFB Network 3GPP2 CSFB Network
CSFB Network Architecture
S4
S3
SGs
S11
S1-C
S1-U
S5/S8 SGi
SGSN
MME
MSC/
VLR
P-GW
S-GW
E-UTRAN
S1-U
S102
S11
S1-C
A1
MME
MSC/
VLR
1x
IWS
P-GW
S-GW
E-UTRAN
S5/S8 SGi

5. © 2012 Qualcomm Technologies, Inc. All rights reserved. 5
CSFB Summary
 Device is registered for both CS and PS services via LTE
 CS voice pages are delivered over LTE
 Device remains on LTE except for voice calls
 SMS can be received over LTE
 For voice calls, UE falls back to UMTS/GSM/C2K
 Mobility methods supported:
Method Target Info Target Prepared Measurements LTE → W LTE → G LTE → C2K
Redirection Target Frequency No Optional Yes Yes Yes
Cell Change Order Target Cell No Required No Yes No
Handover-Based Target Cell Yes Required Yes Yes Yes

6. © 2012 Qualcomm Technologies, Inc. All rights reserved. 6
CSFB to UTRAN Call Setup Delay (Mobile-Originated)
Redirection-Based CSFB Call Setup Delay with
SI Tunneling Is Comparable to Legacy Call Setup Delay
4000 4000 4000
2530
530 380
0
1000
2000
3000
4000
5000
6000
7000
Redirection Rel 8 Redirection Rel 9 (SI Tunnel) PS Handover
Additional
CSFB Delay
UTRAN Legacy
Data shown redirection scenarios is based on results from LAB and field testing. Data shown for handover scenario is based on internal Qualcomm Technologies testing.
Call
Setup
Delay
(ms)

7. © 2012 Qualcomm Technologies, Inc. All rights reserved. 7
CSFB to UTRAN Call Setup Delay (Mobile-Terminated)
Redirection-Based CSFB Call Setup Delay with
SI Tunneling Is Comparable to Legacy Call Setup Delay
2640 2640 2640
2530
530 380
0
1000
2000
3000
4000
5000
6000
Redirection Rel 8 Redirection Rel 9 (SI Tunnel) PS Handover
Additional
CSFB Delay
UTRAN Legacy
Data shown redirection scenarios is based on results from LAB and field testing. Data shown for handover scenario is based on internal Qualcomm Technologies testing.
Call
Setup
Delay
(ms)

8. © 2012 Qualcomm Technologies, Inc. All rights reserved. 8
CSFB PS Data Interruption
The Handover Option Provides the Lowest Data Interruption Time;
For the Redirection Options, ISR Can Significantly Reduce Data Interruption Time
6770
4770
300
2770
770
300
0
1000
2000
3000
4000
5000
6000
7000
8000
Redirection Rel 8 Redirection Rel 9 (SI Tunnel) PS Handover
Without ISR
With ISR
Data shown redirection scenarios is based on results from LAB and field testing. Data shown for handover scenario is based on internal Qualcomm Technologies testing.
CSFB
PS
Data
Interruption
(ms)

9. © 2012 Qualcomm Technologies, Inc. All rights reserved. 9
CSFB to GERAN Call Setup Delay (Mobile-Originated)
RRC Release with SI Tunneling Provides the Best CSFB Solution
3900 3900 3900 3900
2560
560
2960 2660
0
1000
2000
3000
4000
5000
6000
7000
8000
Rel 8 RRC Release Rel 9 RRC Release
(SI Tunnel)
Rel 8/Rel 9 CCO/NACC Rel 8/Rel 9 Handover
Additional
CSFB Delay
GERAN
Legacy
Data shown is based on internal Qualcomm Technologies testing.
Call
Setup
Delay
(ms)

10. © 2012 Qualcomm Technologies, Inc. All rights reserved. 10
1xCSFB Call Setup Delay
e1xCSFB Offers the Shortest Call Setup Time
1700
4260
4000
4700
1650
2390
0
1000
2000
3000
4000
5000
Mobile-Originated Mobile Terminated
Native 1x
Rel 8 1xCSFB
e1xCSFB
1xCSFB
Call
Setup
Delay

11. © 2012 Qualcomm Technologies, Inc. All rights reserved. 11
Dual Radio vs. e1xCSFB
*Some 1x and LTE band combinations may need special attention. **If LTE roaming is not in place then the device will camp on 1x network, provided 1x roaming agreement is in place. *** Dependency on PRL configuration
Metric Dual Radio Solution e1xCSFB
Estimated MO Call Setup Delay 50ms+e1xCSFB Best
Estimated MT Call Setup Delay 1870ms+e1xCSFB Best
Standby Power Consumption 1x+LTE Idle Standby Best (LT-Only Standby)
User Experience Best (Simultaneous Voice and Data [SVD]) No SVD
Device Cost Higher Lower
Network Cost Lower (No Network Impact) Higher
Outbound Roaming No Network Impact* Needs LTE Roaming to Support e1xCSFB**
Inbound Roaming 1x voice, Data on EV-DO*** All Inbound Roamers Allowed
SMS Need IMS to Offload from 1x Network Reuse S102 to Offload from 1x n/w
Future Considerations VoLTE Will Require Nationwide LTE S102 Can Be Reused for SRVCC

12. © 2012 Qualcomm Technologies, Inc. All rights reserved. 12
In Conclusion
 CSFB offers a solution with the cost, size, and battery life advantages of single-radio solutions,
LTE data speeds, and reliability/ubiquity of 2G/3G voice
 Redirection-based CSFB using Release 9 SI Tunneling, for both 3G and 2G offer call delays
within subseconds of legacy call setup delay
 Redirection-based CSFB offers call reliability on par with legacy call setup reliability
 Compared to dual radio solution, e1xCSFB offers more cost effective device solution and also
with shorter call setup delay
 Additional details on CSFB are also available at:
http://www.qualcomm.com/media/documents/circuit-switched-fallback-first-phase-voice-
evolution-mobile-lte-devices

13. © 2012 Qualcomm Technologies, Inc. All rights reserved. 13
© 2012 Qualcomm Technologies, Inc. All rights reserved. Qualcomm, Snapdragon, and Gobi are trademarks of Qualcomm Incorporated, registered in the
United States and other countries. Trademarks of Qualcomm Incorporated are used with permission. Other products and brand names may be trademarks
or registered trademarks of their respective owners.
Qualcomm Technologies, Inc
5775 Morehouse Drive
San Diego, CA 92121-1714

14. 14
Agenda
1:30 pm The 1000x mobile data challenge
- 1:30 How do we enable 1000x? Rasmus Hellberg, Sr Director, Tech Marketing,
- 1:45 How do we get access to new spectrum to reach 1000x? Prakash Sangam Director, Tech Marketing
- 2:00 Taking HetNets to the next level for 1000x Rasmus Hellberg Sr Director, Tech Marketing
- 2:15 The small cell products to power 1000x Prakash Sangam Director, Tech Marketing
(3G/4G small cells, Wi-Fi)
2:45pm The Chipset evolution and multimode challenges
- 2:45 Smartphone signaling and power enhancements Sunil Patil, Director, Product Management
- 3:05 Solving the global multimode and carrier aggregation challenges Peter Carson ,Sr Director Marketing
- 3:25 Circuit switched fallback, performance and interworking Sunil Patil, Director, Product Management
(LTE FDD/TDD GSM, UMTS, TD-SCDMA, 1X)
3:45pm The Voice and data Service evolution—together with Ericsson
- 3:45 The latest on VoLTE Eric Parsons, Strategic Product Manager,
(RCS, SRVCC VoLTE, VoIP over other accesses), LTE, Ericsson
- 4:00 How do we achieve the Smart Pipe? (QoS and more) Peter Carson, Sr Director Marketing
- 4:10 LTE Broadcast services and opportunities Mazen Chmaytelli, Sr Dir, Business Dev.
4G World Wednesday October 31st 1:30pm to 4:30pm