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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

agenda
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
    • 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

Tel

SMS

VMS

EPC

VANC

BSC

RNC

MSC

Voice over LTE via Generic Access

1

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

GERAN

UTRAN

LTE

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

Tel

SMS

VMS

EPC

VANC

BSC

RNC

MSC

What is VoLGA?

1

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

GERAN

UTRAN

LTE

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)
conclusion
Conclusion
  • 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
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