VoLGA (Voice over LTE via Generic Access) Bringing Voice and SMS to LTE Steve Shaw VP Marketing Kineto Wireless sshaw@kineto.com

The Voice over LTE Problem LTE Objectives: Maximize return on LTE investment Lower cost structure for all mobile services Migrate mainstream voice subscribers to LTE Problem: Voice (and SMS) was not built-in to LTE Telephony is an overlay (IMS, VoLGA, …) IMS Telephony outside planning timeline Work still required to match existing voice svcs Solution: Bring primary revenue services to LTE Counter over-the-top VoIP competition PSTN is the largest comms network ever created >4 billion active mobile connections at end-2008; >6 billion by 2014 By 2014, 77% of revenue globally is voice & SMS (vs. 86% in 2009)

Mobile Network Evolution 1990s 2000s 2010s GSM 3G/HSPA RAN LTE Telephony Core network remains as long as there is a GSM or 3G RAN Voice over LTE GAP IMS Telephony? VOICE CORE Telephony Options: 1. VoLGA 2. CS Fallback

Mobile Operator Options Pre-IMS Voice Options: VoLGA Voice over LTE via Generic Access Packetize existing Voice and SMS services and deliver over LTE CS Fallback Instruct handsets to ‘fallback’ to a 3G or 2G network whenever voice service are required Tel SMS VMS 1 Circuit Services Packet Services VANC MSC 1 GERAN UTRAN LTE BSC RNC EPC 2 2

CS Fallback… Falls short Tel SMS VMS Poor user experience Minimum 30% increase in post-dial delays Increased potential for call/network drops Costly and complex Must upgrade MSC network Increased signaling due to network switching A ‘stop-gap’ solution A step away from IMS No RCS, required MSC upgrades, … No support for LTE femtocells Circuit Services Packet Services MSC GERAN UTRAN LTE BSC RNC EPC 1 Not actually voice over LTE

VoLGA Delivers Voice over LTE Tel SMS VMS Excellent user experience Same or faster call setup times Full support of all voice features E911, pre-paid,… Minimal cost/complexity “Doesn’t touch MSC” External controller available from variety of TEMs A better path to IMS Supports combinational voice/ IMS data today Uses RFC 4867 and RoHC for voice transport As planned for IMS telephony Supports LTE femtocells Voice delivered natively via LTE Circuit Services Packet Services VANC MSC GERAN UTRAN LTE BSC RNC EPC

SMS Required for First LTE Deployments Subscriber Setup Notifications Dongle Configurations Data Plan Setup Roaming Support for SMS over LTE is required at initial launch SMS is not intrinsic part of LTE SMS is essential for subscriber management Dongles, netbooks, datacards,… SMS needed for roaming EU roaming regulations VoLGA overcomes SMS over LTE roadblocks In time for initial deployments Regulatory Warnings Subscriber Regulator Notification OTA OTC Svs Bill Shock Warning PLMN Selection Roaming Tariff Notification Premium Stop Service Cell ID Interrogation SM-SC Data-only LTE/3G Devices VoLGA is Visited Network Independent

Validation of SMS over LTE Requirement Dismissal of CSFB as solution Submissions to 3GPP SA2 on June 1, 2009 Co-signed by Vodafone, China Mobile, ALU, Huawei, Starent, ZTE. Rules out CS Fallback and IMS as valid options for SMS over LTE Proposes alternative solution to SMS over LTE Still requires visited network support VoLGA Forum investigating ( http://www.3gpp.org/ftp/tsg_sa/TSG_SA/TSGS_44/Docs/SP-090429.zip)

Voice over LTE via Generic Access 13.08.2007 Autor / Thema der Präsentation 9 Voice over LTE via Generic Access

VoLGA Momentum Stage 2 specifications published 13.08.2007 Autor / Thema der Präsentation 10 Stage 2 specifications published T-Mobile/VoLGA Forum webinar Added 8 new members Genband, HTC, Mavenir, Sonus, Starent, Tecore, Ulticom, WiChorus Considerable news coverage Forum launched March 31, 2009

Path to Standardization 2008 2009 T-Mobile and Kineto complete initial feasibility study Companies initiate promotion and standardization efforts VoLGA Development Agreement Released 1st Output Stage 1 Completed March 2nd Output Stage 2 Complete in June 3rd Output Stage 3 completed by Sep 2009 Introduced into 3GPP CSoEPS TR study item Agreed as preferred way forward in CSoEPS TR summary Next Step Introduce to 3GPP 11

Four things to know about VoLGA VoLGA delivers SMS over LTE SMS over LTE is critical for early data-only deployments Key requirement for LTE dongles, datacards and netbooks For devices, VoLGA is the lowest impact design VoLGA packetizes and transports existing messages CS Fallback requires modification to GSM/3G protocol stacks, new interfaces IMS Telephony is a totally new call control system VoLGA is very efficient Uses RFC 4867 and RoHC (just like IMS) VoLGA does not tunnel user traffic VoLGA is a better path to IMS than CSFB Avoid MSC upgrades for CSFB Deploy IMS-based RCS (Rich Communications Suite) combinational voice/data services Start IMS evolution today 12

About Kineto Wireless Focus: Enabling mobile operators to embrace broadband access FMC: Dual-mode handsets, femtocells, terminal adaptors, soft mobiles Voice over LTE: Extending mobile voice and SMS services over LTE Key innovator behind key industry standards 3GPP UMA/GAN 3GPP HNB (Femtocell) 3GPP CSoEPS (VoLGA) Leading provider of FMC and Voice over LTE technology to major wireless infrastructure and devices suppliers