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Push-to-Talk over Cellular

References. Proposed by Ericsson, Motorola, Siemens, NokiaPush-to-talk over Cellular (PoC); User Requirements; PoC Release 1.0Push-to-Talk over Cellular (PoC); Architecture; PoC Release 1.0Push-to-Talk over Cellular (PoC); List Management and Do-not-Disturb; PoC Release 1.0Push-to-Talk over Cellular (PoC); Signaling Flows; PoC Release 1.0;Push-to-Talk over Cellular (PoC) User Plane; Transport Protocols; PoC Release 1.0;Push-to-Talk over Cellular (PoC) User Plane; (E)GPRS / UMTS Specificati197

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Push-to-Talk over Cellular

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    1. Push-to-Talk over Cellular

    2. References Proposed by Ericsson, Motorola, Siemens, Nokia Push-to-talk over Cellular (PoC); User Requirements; PoC Release 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 Release 1.0; Push-to-Talk over Cellular (PoC) User Plane; Transport Protocols; PoC Release 1.0; Push-to-Talk over Cellular (PoC) User Plane; (E)GPRS / UMTS Specification; PoC Release 1.0;

    3. What is Push-to-talk

    4. What is PoC Push-to-Talk over Cellular Based on 3GPP IP Multimedia Subsystem (IMS) Access Network utilizes UTMS GPRS network Support group talk Utilize RTCP for floor control

    5. Why PoC User’s view There’s usually one talking and another listening in a phone call Save bandwidth = save money Advanced services: group talk, auto-answer, floor control Operator’s view Advanced service: compete against other operator, increases revenue Users tend to use this service more often and longer = more money

    6. PoC Architecture

    7. 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

    8. User identification and addressing Email style (URI) Telephone number (TEL URL) Contact list management User list URI Display name Group identity URI Display name

    9. Access management Do-not-Disturb Reject list * URI Access list * URI

    10. 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

    11. 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

    12. High level procedures Early Session dialog establishment Early media procedure Late media procedure

    13. Early session and auto answer

    14. Early media and auto answer

    15. Late media and manual answer

    16. 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

    17. UE state transition diagram

    18. PoC server transition diagram

    19. Floor Request Procedure

    20. Nearly Simultaneous Floor Request

    21. Floor Release Procedure

    22. Example of an instant group talk session

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