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Voice over LTE via Generic Access. Jyothi Nandikonda Supervisor: Olav Tirkkonen. Agenda. Study and Objectives Thesis scope Problem being studied and addressed Methodology used What is LTE? LTE migration path What LTE brings to Operators / End-users Voice over LTE – Challenges

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Voice over lte via generic access

Voice over LTE via Generic Access

Jyothi Nandikonda

Supervisor: Olav Tirkkonen


  • Study and Objectives

    • Thesis scope

    • Problem being studied and addressed

    • Methodology used

  • What is LTE?

    • LTE migration path

    • What LTE brings to Operators / End-users

  • Voice over LTE – Challenges

    • Lack of Standards

    • The problem of voice in LTE

    • Solution for the problem

  • Alternative Solutions

    • CSFB

    • VoLGA

    • IMS

    • Other

  • VoLGA

    • What is VoLGA and How it works?

    • Why VoLGA ?

  • Conclusions

Objectives scope
Objectives & Scope

  • To study and elaborate on the problem of bringing the Voice solution into LTE networks

  • To study the various alternatives available for the operators to implement the Voice in LTE networks

  • As an intermediate alternative, to study in detail the VoLGA solution and compare the against various other implementation choices

Long term evolution lte
Long Term Evolution (LTE)

  • LTE is a new radio access technology, next generation mobile broadband standard, and obvious successor to the 3G UMTS technologies

    • Known as 3.9G, a way forward to 4G

  • LTE brings improved spectral efficiency at lower latency and offers high peak data rates

    • Almost 100 times imrovement

  • A key aspect of LTE is it’s simplified, flat-network architecture based on all IP networks

    • Anywhere, anytime and always-on

  • Ideal for delivering Real-time services which require high speed data and high efficient radio

    • Multimedia, Streaming, IPTV, VoD

Long term evolution lte1
Long Term Evolution (LTE)

  • Operator benefits

    • Low CAPEX and OPEX + Highly efficient

    • Maximize Return on Investment

    • Low cost structure for all mobile services

    • Support of exisiting / profitable business models

    • Smooth migration path

    • LTE is an Investment safe technology

  • End-user Benefits

    • Reasonable costs with high data speeds

    • Seemless user experiance with always ON

    • Full interoperability support and international roaming support

  • 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)

Voice over lte challenges
Voice over LTE - Challenges

  • Lack of Standards

    • Clarity in standards missing to support the delivery of voice in LTE

  • The Real Problem

    • No Native Voice and SMS in LTE

    • IMS Telephony outside planning timeline

    • SMS is an essential for LTE data only deployments

  • Solution

    • Re-use existing Core Network Systems and mechanisms

    • Bring the primary revenue services (Voice/SMS) to LTE

    • Enable Long-Term Service evolution

    • Counter over the top VoIP Competetion

Alternative solutions
Alternative Solutions

  • CSFB – Circuit Switched Fallback

  • VoLGA – Voice over LTE via Generic Access

  • IMS – IP Multimedia Subsystem

  • Other

    • One Voice Initiative

    • Over the top VoIP

Circuit switched fallback
Circuit Switched Fallback

  • CS Fallback

    • LTE handsets reverts or ‘fallback’ to a 3G or 2G radio network whenever voice service are required

  • Costly and Complex

    • Must require MSC Upgrades

    • Increased signalling due to network switching (LTE->3G/2G)

  • Poor user experiance

    • Call setup times are high; > 1.5sec

    • Increased potential for call /network drops

    • No Parallel voice and data if legacy network is 2G

  • A Step away from IMS

    • No support for IMS RCS

    • No support for LTE Femtocells

Voice over lte via generic access1









Voice over LTE via Generic Access


Circuit Services

Packet Services

  • A technological approach for delivering Voice and SMS services over LTE access networks

  • Leverages a mobile operators existing core voice networks and investments

  • Build upon fully 3GPP compliant Rel-8 LTE/EPC network

  • Derived from the existing 3GPP GAN Standard

  • Supported by industry consortium known as VoLGA Forum




Ip multimedia subsystem
IP Multimedia Subsystem

  • IP Multimedia Subsystem

    • It’s not a technology, rather an architecture framework based on set of open standards developed by 3GPP

    • Enables the convergence of data, speech and mobile network technology over IP-based infrastructure

    • One of Key enabler for IMS is SIP protocol, which is used for establishing, managing and terminating sessions on IP networks

  • IMS is Costly and Complex

    • Solution availability and stability not feasible in time

    • Solution would consists of IMS platform, various application servers and requires major upgrade/changes to MSC servers

    • No eco-system in place yet for IMS Voice/SMS roaming and interconnect

What is volga









What is VoLGA?


Circuit Services

Packet Services

  • VoLGAdoesn’t fallback to 2G /3G network for Voice/SMS

  • Voice services are packetized and delivered natively over LTE

  • Excellent User Experiance

    • Same or faster call setup times as 3G

    • Full support of extended voice services

    • E.g: E911, prepaid

  • Minimal cost/complexity

    • No MSC upgrades

    • Introduces VANC (VoLGA access network controller)

  • A better path to IMS

    • Supports IMS RCS and Combinational Voice/Data services today

    • Supports LTE Femtocells




    How volga works
    How VoLGA Works?

    • The concept is to connect the already existing MSC to LTE Network via gateway known as VANC

    • VANC responsible for connecting the Packet Switched LTE network to Circuit Switched Core Network

    • UE registers with MME over LTE access network

    • UE establishes a connection with VANC via PDN Gateway over SGi interface

    • UE registers to the MSC through the Secure tunnel and the VANC.

    • VANC connects to GSM/UMTS MSC via A/Iu-cs interface respectively

    • All signalling and data traffic (UE-VANC) is transported via SGi interface

    • In case of handover, E-UTRAN initiates HO, and informs to UE

    • VANC triggers intra/inter MSC-Handover

    Why volga
    Why VoLGA?

    • VoLGA is Fastest , Low Cost and Low risk approach

      • Avoids MSC upgrades/changes

      • Provides IMS RCS services and Combinational of voice and data services

      • Provides long-term investment protection

      • Full service transparency with proven service core

    • For devices, VoLGA is the lowest impact design

      • Minimizes the impact on UE, especially User Interface

      • Supported by all major handset manufacturers

    • VoLGA delivers SMS over LTE

      • SMS is essential for early LTE data-only deployments

      • SMS is required for Subscriber Management/EU Roaming

      • SMS is a key for LTE dongles, datacards and netbooks

    • VoLGA is very robust and efficient

      • Based on 3GPP GAN Standard

      • Relies on many of same underlying technology as IMS for Voice

      • Uses RFC4867 for VoIP and Robust Header Compression -RoHC (like in IMS)


    • For many operators, the target architecture for voice over LTE is IMS

    • Sooner or later, operators move to IMS for their initial deployment

    • However, it is clear that there will be an interim period for other operators, who are not yet invested in IMS for voice, for those an interim solution is needed

    • VoLGA today

      • offers a less-intrusive, low cost and low risk approach

      • provides higher quality user experiance than CSFB

      • offers a better path towards IMS voice networks

      • supports IMS RCS and combinational voice / data services

      • provides long-term investment protection as well as short-term service acceleration designed to deliver profitable voice services

      • offers by far the best combination of simplicity and functionality