Voice iver LTE

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Voice and SMS in LTE Technical OverviewSpeaker NameDate

AGENDA1. Introduction 2. Solution Architecture Overview 3. End-User Services

You will have to modify the agenda based on the sections you include in your talk

4. Regulatory Services5. Provisioning / migrating subscribers 6. Roadmap 7. Supporting Sections

1. Introduction

Voice in LTE Introduction Initial LTE deployments were focused on data services- However, carriers are quickly expanding to voice services as well

In an attempt to ease introduction of voice in LTE, phased approaches are available:Circuit-Switched Fallback (CSFB) This method drops the UE from LTE to CDMA 1x any time a voice all is active Dual-Transceiver Handsets (SVLTE) Approach requiring specialized handsets has traction among CDMA operators

IMS with GSMA VoLTE This is the widely accepted target architecture for voice in LTE

Note there are other niche approaches that a small set of vendors and service providers are pursuing:- Use SIP UE with proprietary enhancements to MSCThis method enhances an existing MSC with a SIP Gm interface (i.e. NSN FastTrack)

- These approaches have limited traction in the market place. The supporting ecosystem is uncertain.5 COPYRIGHT 2011 ALCATEL-LUCENT. ALL RIGHTS RESERVED. ALCATEL-LUCENT INTERNAL PROPRIETARY USE PURSUANT TO COMPANY INSTRUCTION

Market and network trends impacting voice solution for LTE Voice remains important but no longer is the dominant service in terms of radio network load- Market will however split between legacy and rich services- Some operators targeting rich services only for power users with others planning to generalize rich services to all users - Legacy services expected to remain the only option for legacy terminals

LTE rollout will be similar to 3G- Gradual increase in covered area across network- Some operators targeting LTE coverage to exceed 3G deployment - Others planning to always have wider 3G coverage than LTE - May also depend on frequency bands allocated for LTE - i.e., higher bands may result in coverage holes indoors etc.

- Support for users roaming onto networks without LTE coverage will remain key requirement for at least 10 years

SMS solution typically required from day 1- Data only terminals MAY be an exception depending on configuration update mechanism

Assumed requirements for Voice and SMS over LTE capable terminals Services- Voice service continuity to be ensured during handover to CDMA access- Solution to support handover from CDMA to LTE requires standardization when, and if, agreed technical solution and need has been determined

- Voice service may be controlled using IMS servers and applications- Including when in CDMA circuit mode

- Voice service to be available while roaming on other LTE networks- Independent of preferred voice solution of visited network

Network- Voice specific functionality in E-UTRAN and EPC to be minimized- Header compression (RoHC) and Semi-Persistent Scheduling in E-UTRAN - Possibly CSFB and/or SRVCC support in MME

- Possibly CSFB and/or SRVCC support in MSCs

Options for Supporting Voice and SMS with LTEThere are three options we can discuss for voice/SMS services with LTE:Option CS Fall-back (CSFB) Description UE is registered in LTE and is paged over LTE but takes call in CDMA Circuit mode Comment Attractive as a means of re-using all the CS infrastructure. Note this option precludes simultaneous LTE data and voice (different carriers)

Simultaneous Voice and LTE (SVLTE)

UE maintains simultaneous registration on LTE network for data and legacy network for voice/SMS

Offered in the UE at the expense of greater complexity and shorter battery life.

Voice over LTE (VoLTE)

Uses a standard 3GPP IMS and LTE features to improve voice capacity Continuity Options: Hand-down to CDMA circuit domain LTE eHRPD PS HO required if VoIP over eHRPD is supported8

Call control for native LTE voice and SMS service is provided by IMS. IMSbased call control can be provided in the CDMA domain via the IMS anchoring for calls originated in CDMA circuit mode.

Voice with LTE and CDMA Networks Standards VoLTE Standards span 3GPP R8 (2008) to current release- All variants of CDMA (1x, 1x Advanced, EVDO Rev A, Multi-Carrier EVDO and DO Advanced) have been enhanced to allow delivery of voice in a mixed LTE/CDMA network including options for 1x CSFB, 1x SRVCC, 1x DRVCC, and VoIP handover via eHRPD PSHO.

Alcatel-Lucent is a very active participant in 3GPP and 3GPP2. 3GPP2 references include- C.S0087: E-UTRAN cdma2000 HRPD Connectivity and Inter-working Air Interface

- C.S0097: E-UTRAN cdma2000 1x Connectivity and Interworking Air Interface- A.S0022: IOS for eHRPD RAN Interfaces and Interworking with E-UTRAN - X.S0042: Voice Call Continuity Between IMS and Circuit Switched Systems - X.S0057: E-UTRAN eHRPD Connectivity and Interworking: Core Network Aspects

GSMA VoLTE (formerly referred to as OneVoice) GSM Association (GSMA) sponsored IR.92 profile is an industry effort to ease the introduction of VoLTE/VoIMS via specification of critical interworking requirements between UE and network vendors- Work initiated within standalone "One Voice" forum and transferred to GSMA IREG RiLTE in early 2010

Alcatel-Lucent was one of the original members of the One Voice forum and is an active participant within RiLTE working group managing this profile

We have completed an end-to-end evaluation of the GSMA VoLTE IR.92 Profile v2.0 specification across the ALU portfolio and ALU LTE Solution is currently ready for initial UE interoperability testing of this profile ALU is committed to supporting GSMA VoLTE IR.92 profile and IR.88

Primary Migration strategies for Voice and SMS services: Industry TrendsInitial LTE launchData modems only. Deploy 1H2011 Including smartphones; earliest test 1H2011; deploy 2H2011

Service Rollout

Full range of terminals; earliest test 2H2011; deploy 1H2012

Mass market

Network optimizationFull range of terminals 2013+

Option for data only devicesLTE only Data only devices LTE and eHRPD Data only devices LTE and eHRPD Data only devices LTE and eHRPD Data only devices

VoLTE with DRVCC SRVCC

IMS VoLTE (complete LTE coverage)

IMS VoLTE/VoIP over eHRPD

LTE with Dual Tx CSFBIP-Optimized solution

IMS VoLTE with S102 SRVCC CDMA

IP+Circuit solution11

Voice and SMS via S102 CSFB

2a. Solution Architecture Overview: Circuit-Switched Fallback

CS Fallback Approach

and SMS over S102- Voice call setup (either mobile originated or incoming page) triggers UE move from LTE to 1x to then support voice over CS

- SMS delivery over LTE using S102 interface

Handover- LTE->1x: Data session suspended during voice call

Key elements- Upgrade to MME, E-UTRAN and all MSCs (or installation of IWS) for S102 interface in LTE coverage area- Only selected MSC need be upgraded if only used for SMS over S102, e.g., for SMS to data-only endpoints

- CSFB client in terminal

Target usage- Operators with embedded 1x network building LTE overlay, or - Operators building LTE network and choosing SMS over S102CS Fallback and SMS over S102 are both defined in 3GPP TS 23.272. + 3GPP2 C.S0097

CS Fallback - High Level ArchitectureMSC CDMA 1X CS Network CDMA 1x MSC CS Network

E-UTRAN

New interface S102 from MSC to MMEPDN

E-UTRAN

MMEPDN

eNode B

Data Paging/SMS

eNode B

While carrying data only

Voice iver LTE

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Transcript of Voice iver LTE

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