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Push-to-Talk Over Cellular: PoC Architecture & Features

Learn about Push-to-Talk over Cellular (PoC) architecture, user requirements, signaling flows, and list management in PoC Release 1.0. Understand the benefits, features, and user identification in PoC, as well as the PoC server and GLMS functionality.

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Push-to-Talk Over Cellular: PoC Architecture & Features

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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. Voice: RTP Voice: RTP What is Push-to-talk Talking SIP:Joan@voip.net Listen Listen Talking Johnson Joan Basically behaves like a Walkie-Talkie phone

  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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