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Push To Talk Over Cellular: Still Searcing The Flow Of Success. Research Seminar on Telecommunications Business II Seminar presentation 12.4. 2005 Raili Koivisto Helsinki University of Technology . Contents. Introduction Benefits for end-users and operators

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push to talk over cellular still searcing the flow of success

Push To Talk Over Cellular: Still Searcing The Flow Of Success

Research Seminar on Telecommunications Business II

Seminar presentation 12.4. 2005

Raili Koivisto

Helsinki University of Technology

contents
Contents
  • Introduction
  • Benefits for end-users and operators
  • Technology options and substitutes
  • Performance
  • Vendor and operator strategies
  • Pricing
  • Regulation
  • Conclusions
introduction
Introduction
  • PTT is a half-duplex voice service
  • PTT available since World War II with limited coverage but minimum charges
  • In 1996 Nextel begins to rollout iDEN
  • PTT in cellular networks is called Push-To-Talk over Cellular (PoC)
poc building blocks
PoC building blocks
  • PoC Server for floor control and speech traffic
  • SIP IP Core for signalling
  • GLMS for group management
  • Presence Server
  • PoC Client in terminal
benefits for end users
Benefits for end-users
  • Immediate wireless contact to a pre-defined person or group
  • Worldwide network
  • Suitable for group of friends, hunters, small businesses
benefits for operators
Benefits for operators
  • Enables to compete with existing PTT services
  • Enhanced voice services
  • New usage models -> more usage -> increased ARPU in developed markets
  • New users in developing markets
  • Efficient way of using network resources
technology options
Technology options
  • OMA PoC by Ericsson, FastMobile, Motorola, Nokia, Siemens, Sonim
    • CDMA, GSM, WLAN, client-only implementation
    • IMS architecture based
  • iDEN by Motorola
    • Fast ”chirp to talk” times
    • Proven solution
  • QChat by Qualcomm
    • CDMA only
    • BREW client-only implementations
  • Circuit-based PoC by Kodiak Networks
    • Network agnostic
    • Circuit connection after call set-up -> cost, radio resource use
substitutes
Substitutes
  • Conference call
    • No savings in cost or radio resource, slow to set up
  • Fastchat
    • Client integrated in Symbian
  • SKYPE + PDA + WLAN
    • Peer-to-peer, no central host, limited user base
    • Smaller savings in cost or radio resource

Push-To-Talk over Bluetooth

    • Short range only
    • Free of charge
    • Hybrid with PoC possible
  • Instant Messenger solutions
    • Limited terminal selection
performance
Performance
  • Circuit-switched PoC over 6x more expensive than PoC over GPRS
  • PoC over GPRS 5x more efficient, PoC over EGPRS 14x more efficient than over GSM
  • Latencies remarkable in GPRS
  • Voice quality on GSM level, BER quite high
  • Performance depends on end-to-end tuning
vendor strategies
Vendor strategies
  • Several camps beside OMA standardization work, other technologies also further developed
  • Use of pre-standards to colonize markets
  • Clients available in phones
  • Trials with operators ongoing
operator strategies
Operator strategies
  • 35 operators using pre-standard solutions now, 14 of them using Kodiak in CS
  • Others waiting for OMA standard?
    • Or thinking positioning/pricing/target groups?
    • Or gathering money for new investments?
    • Or denying to cannibalize existing business?
  • Charging requires interconnection agreements
  • Lacking walkie-talkie culture in Europe
pricing
Pricing
  • OMA architecture supports several pricing methods
  • In US subscription fee includes certain no of minutes
  • In Australia normal call charge doubled
  • Simple pricing model encourages users
  • Pricing now – pricing in future
regulation
Regulation
  • Is PoC a voice service which should be regulated (legal interception)?
  • EU wants to encourage, not restrain diffusion of VoIP, FCC on same way but…
  • Privacy of user data, presence, location, group lists has to be regulated
  • Regulation needed for competition issues
  • Not applicable for emergency services
conclusion
Conclusion
  • Technology push but no dominant design yet
  • High performance and worldwide interoperability require standard based solutions
  • Proven use case in US but does it work in Europe or Asia?
  • Is there enough attractiveness before multimedia convergence and virtual reality solutions?