1. Benefits of VoLTE/RCS to Carriers and Subscribers
Quan Choi
Sr. Manager
Product Strategy

2. What is RCS?
Rich Communication Services (RCS), provides Mobile Network Operators with a means of transitioning circuit services (voice and SMS) into an all-IP and LTE world
Latest version of RCS is Release 5.1, bringing in support for IP Voice, IP Video, and Location Sharing
Voice over LTE (VoLTE) is an RCS service
Enabled by an IMS platform
Content Sharing
Video sharing
picture sharing
File transfer
Location sharing
Chat
1:1 chat
Group chat
Enhanced Address Book
Picture/ Portrait
Link
Status text
Availability
Location Information
Time zone
Voice and Video
VoLTE (with lower latency)
HD Voice
IP Video Call
Video Conferencing
Video Messaging/Video VM
Messaging
SMS
MMS
IMS platform

3. Challenges in Implementing VoLTE
Emergency services
SRVCC
Service Continuity
Complexity

4. Emergency/Regulatory Services
E911 over VoLTE network
CMAS over LTE
Wireless Prioritized Services on LTE
CALEA for lawful intercept

5. 3GPP 3GPP2 Voice Call Continuity AT&T and T-Mobile
Launched with eSRVCC
Call remains connected when mobile moves out of VoLTE network
Network and chipset support commercially available
3GPP2
Verizon depends on complete nationwide LTE coverage
Call will drop when device moves out of home VoLTE network
Very costly for network support and no device support

6. Service Continuity AT&T Fine Print
“The following features/services are currently incompatible with HD Voice service: prepaid service, Smart Limits, Ringback Tones, and OfficeDirect and OfficeReach (for business customers).”
Other services that may differ between IMS and legacy network
Conference calling (number of connections could vary)
Video calling and conferencing
Other enhanced messaging services
Simultaneous voice and LTE

7. Why not VoIP over LTE? Features on the device and RAN QoS and GBR
Call quality unaffected by congestion
QoS and GBR
Battery life savings
Maximized eNodeB resource utilization
Discontinuous Reception (DRX)
Reduced latency
Less error
Robust Header Compression (RoHC) for RTP profile
Optimizes for fixed interval transmissions, such as VoLTE
Reduced signaling overhead
Semi-Persistent Scheduling (SPS)
Optimizes cell edge coverage on the uplink
Reduces signaling overhead
Reduces error and latency
Transmission Time Interval (TTI) Bundling
Features on the device and RAN

8. VoLTE Status on Tier-1 Carriers in North America
VoLTE Launched nationwide in September 2014
Supported on GS5, LG G2, and iPhone 6
Part of their Advanced Calling 1.0, with VoLTE and video calling (except on the iPhone)
No SRVCC
Move off of CDMA ASAP
VoLTE launch in May 23, 2014 with HD Voice 3 in limited market with one device
Support SRVCC
Video calling support likely to follow Verizon in 2014.
Other RCS feature, such as enhanced messaging to follow
Expect VoLTE launch in 2015, market by market
Currently support HD voice through 1x-advanced
Very limited deployment
RCS support via Jibe in 2014
VoLTE launch in May 22, 2014, with HD voice, completed national deployment in July – Currently, four devices supported
Support SRVCC
They will likely continue to support “Joyn-like” RCS services, but will deploy full RCS services such as video and enhanced messaging
Mention that Sprint is doing Jibe for RCS. With AT&T to follow.

9. Benefits to Carriers Improve current offerings
Better voice experience to drive usage
Text and MMS improvements
New offerings
Compete with competitors as they start offering the new RCS features
Opportunity to offer new products that can increase ARPU
New revenue streams with APIs into RCS services (Think WebRTC)
Drive data usage
Video services and content sharing will use more data
Increase the perceived value of the data services
Compete with OTT
Better experience with LTE network support
Ease of use, communicate via phone number
Trusted and reliable, offered by the user’s service provider

10. Customer Benefits Better voice experience
HD Voice
Quicker call setup time
Simultaneous voice and LTE
Enriched Services using existing phone number
Video calling and enhanced messaging
Ease of use, communicate via phone number
Reliable and supported by the carrier
No change to billing
Voice and SMS charged in the same way
Other services, such as video and enhanced messaging charged as data

11. Real Benefits to Carriers
Lower OpEx and CapEx through a single network
Offer competitive services and products to reduce churn
Reduce the risk associated with drastically reduced pool of CDMA carriers
Achieve device cost savings from eliminating CDMA royalties and larger, more uniform device ecosystem
Open up more potential roaming partners

12. End state for VoLTE Interoperable services for VoLTE/RCS
Similar to when carriers had to encourage adoption of SMS/MMS
End-to-end inter-carrier HD voice and RCS
Interoperable services for VoLTE/RCS
Reuse spectrum currently used for circuit
Carrier aggregation to increase LTE capacity
Take advantage of LTE’s spectral efficiency
Refarm spectrum from legacy networks
Tighter partnerships with developers to create new products that take advantage of carrier assets
Converged communication services
Build up new services on IMS for new offerings
Voice over WiFi that offer telecommunication over multiple devices using the user’s number
Multi-device telephony services
Extend beyond cellular networks through IMS

13. Thank You