Push to talk over cellular still searcing the flow of success
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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

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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)


Push to talk over cellular still searcing the flow of success

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?


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