Pptc Push to Tack

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    Push-to-Talk over Cellular

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    References Proposed by Ericsson, Motorola, Siemens, Nokia

    Push-to-talk over Cellular (PoC); User Requirements; PoCRelease 1.0

    Push-to-Talk over Cellular (PoC); Architecture; PoC Release 1.0

    Push-to-Talk over Cellular (PoC); List Management and Do-not-Disturb; PoC Release 1.0

    Push-to-Talk over Cellular (PoC); Signaling Flows; PoC Release1.0;

    Push-to-Talk over Cellular (PoC) User Plane; Transport Protocols;PoC Release 1.0;

    Push-to-Talk over Cellular (PoC) User Plane; (E)GPRS / UMTSSpecification; PoC Release 1.0;

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    What is Push-to-talk

    SIP:[email protected]

    Basically behaves like a Walkie-Talkie phone

    Voice: RTP

    Voice:RTP

    TalkingListenTalking

    Listen

    JoanJohnson

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    What is PoC Push-to-Talk over Cellular

    Based on 3GPP IP MultimediaSubsystem (IMS)

    Access Network utilizes UTMS GPRSnetwork

    Support group talk

    Utilize RTCP for floor control

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    Why PoC Users view

    Theres usually one talking and another listeningin a phone call

    Save bandwidth = save money Advanced services: group talk, auto-answer, floor

    control

    Operators view

    Advanced service: compete against other operator,increases revenue Users tend to use this service more often and

    longer = more money

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    PoC Architecture

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    Summary of basic features 1-to-1 communication feature

    Instant personal talk

    Request to talk

    Group talk features Chat group talk

    Instant group talk Ad-hoc instant group talk

    Instant personal alert

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    User identification and

    addressing Email style (URI)

    Telephone number (TEL URL)

    Contact list management

    User list

    URI

    Display name

    Group identity URI

    Display name

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    Access management Do-not-Disturb

    Reject list *

    URI

    Access list

    *

    URI

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    PoC Server SIP signaling

    SIP session handling RTP and RTCP signaling

    Policy control for access to groups

    Group session handling Do not disturb functionality

    Floor control functionality

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    GLMS (Group and List

    Management Server) Users use GLMS to manage groups, contact lists and

    access lists and Do-not-Disturb indication

    contact list : a kind of address book group list : users can define PoC group

    access list : who is allowed to initiate talk session(Only used by PoC server)

    Do-not-Disturb (DnD) : set to block all incoming talk

    session request UE-GLMS interface : HTTP/XML protocols shall be

    used or WAP

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    High level procedures Early Session dialog establishment

    Early media procedure Late media procedure

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    Early session and auto answer

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    Early media and auto answer

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    Late media and manual answer

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    Floor control Utilize RTCP to ensure singular access to the

    PoC media resource

    Floor request : UE requests PoC server Floor grant : PoC server notifies UE Floor taken : PoC server notifies UE Floor deny : PoC server notifies UE

    Floor release : UE notifies PoC server Floor idle : PoC server notifies UE Floor revoke : PoC server revokes the media

    resource

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    UE state transition diagram

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    PoC server transition diagram

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    Floor Request Procedure

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    Nearly Simultaneous Floor

    Request

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    Floor Release Procedure

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    Example of an instant group talk session