Peer-to-Peer Streaming Tracker Protocol (PPSTP)
RFC 7846

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Internet Engineering Task Force (IETF)                           R. Cruz
Request for Comments: 7846                                      M. Nunes
Category: Standards Track                              IST/INESC-ID/INOV
ISSN: 2070-1721                                                   J. Xia
                                                           R. Huang, Ed.
                                                                  Huawei
                                                              J. Taveira
                                                                IST/INOV
                                                               D. Lingli
                                                            China Mobile
                                                                May 2016

            Peer-to-Peer Streaming Tracker Protocol (PPSTP)

Abstract

   This document specifies the base Peer-to-Peer Streaming Tracker
   Protocol (PPSTP) version 1, an application-layer control (signaling)
   protocol for the exchange of meta information between trackers and
   peers.  The specification outlines the architecture of the protocol
   and its functionality; it also describes message flows, message
   processing instructions, message formats, formal syntax, and
   semantics.  The PPSTP enables cooperating peers to form content-
   streaming overlay networks to support near real-time delivery of
   structured media content (audio, video, and associated timed text and
   metadata), such as adaptive multi-rate, layered (scalable), and
   multi-view (3D) videos in live, time-shifted, and on-demand modes.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7846.

Cruz, et al.                 Standards Track                    [Page 1]
RFC 7846                          PPSTP                         May 2016

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1. Introduction ....................................................4
      1.1. Terminology ................................................4
      1.2. Design Overview ............................................6
           1.2.1. Typical PPSP Session ................................7
           1.2.2. Example of a PPSP Session ...........................7
   2. Protocol Architecture and Functional View ......................10
      2.1. Messaging Model ...........................................10
      2.2. Request/Response Model ....................................10
      2.3. State Machines and Flows of the Protocol ..................12
           2.3.1. Normal Operation ...................................14
           2.3.2. Error Conditions ...................................15
   3. Protocol Specification .........................................16
      3.1. Presentation Language .....................................16
      3.2. Resource Element Types ....................................16
           3.2.1. Version ............................................16
           3.2.2. Peer Number Element ................................17
           3.2.3. Swarm Action Element ...............................18
           3.2.4. Peer Information Elements ..........................18
           3.2.5. Statistics and Status Information Element ..........20
      3.3. Requests and Responses ....................................21
           3.3.1. Request Types ......................................21
           3.3.2. Response Types .....................................21
           3.3.3. Request Element ....................................22
           3.3.4. Response Element ...................................23
      3.4. PPSTP Message Element .....................................24
   4. Protocol Specification: Encoding and Operation .................24
      4.1. Requests and Responses ....................................25