Multipath Real-Time Transport Protocol Based on Application-Level Relay (MPRTP-AR)
draft-leiwm-avtcore-mprtp-ar-07

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Network Working Group                                             W. Lei
Internet-Draft                                                  W. Zhang
Intended Status: Experimental                                     S. Liu
Expires: July 24, 2017                           Northeastern University
                                                        January 24, 2017

                 Multipath Real-Time Transport Protocol
              Based on Application-Level Relay (MPRTP-AR)
                    draft-leiwm-avtcore-mprtp-ar-07

Abstract

   Currently, most multimedia applications utilize a combination of 
   real-time transport protocol (RTP) and user datagram protocol (UDP). 
   Application programs at the source end format payload data into RTP 
   packets using RTP specifications and dispatch them using unreliable 
   UDP along a single path. Multipath transport is an important way to 
   improve the efficiency of data delivery. In order to apply the 
   framework of multipath transport system based on application-level 
   relay (MPTS-AR) to RTP-based multimedia applications, this document 
   defines a multipath real-time transport protocol based on 
   application-level relay (MPRTP-AR), which is a concrete 
   application-specific multipath transport protocol (MPTP). Packet 
   formats and packet types of MPRTP-AR follow the common rules 
   specified in MPTP profile. Based on MPRTP-AR, RTP-based multimedia 
   applications can make full use of the advantages brought by MPTS-AR.

Status of this Memo

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   This Internet-Draft will expire on July 24, 2017.

 
Leiwm, et al.            Expires July 24, 2017                  [Page 1]
Internet-Draft                  MPRTP-AR                January 24, 2017

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Table of Contents

   1. Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3. Overview  . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   4. MPRTP-AR User Agent Behavior  . . . . . . . . . . . . . . . . .  5
     4.1 Flow Partitioning  . . . . . . . . . . . . . . . . . . . . .  5
     4.2 Subflow Packaging  . . . . . . . . . . . . . . . . . . . . .  6
     4.3 Subflow and Flow Recombination . . . . . . . . . . . . . . .  6
     4.4 Subflow Reporting  . . . . . . . . . . . . . . . . . . . . .  6
     4.5 Flow Reporting . . . . . . . . . . . . . . . . . . . . . . .  7
   5. MPRTP-AR Packet Format  . . . . . . . . . . . . . . . . . . . .  8
     5.1 MPRTP-AR Data Packet . . . . . . . . . . . . . . . . . . . .  8
       5.1.1 MPRTP-AR Data Packet for RTP packet  . . . . . . . . . .  8
       5.1.2 MPRTP-AR Data Packet for RTCP packet . . . . . . . . . .  9
     5.2 MPRTP-AR Control Packet  . . . . . . . . . . . . . . . . . . 10
       5.2.1 MPRTP-AR Subflow Sender Report . . . . . . . . . . . . . 10
       5.2.2 MPRTP-AR Subflow Receiver Report . . . . . . . . . . . . 12
       5.2.3 MPRTP-AR keep-alive packet . . . . . . . . . . . . . . . 14
       5.2.4 MPRTP-AR Flow Recombination Report . . . . . . . . . . . 14
   6. SDP Considerations  . . . . . . . . . . . . . . . . . . . . . . 15
     6.1 Signaling MPTP Capability in SDP . . . . . . . . . . . . . . 16
     6.2 An Offer/Answer Example  . . . . . . . . . . . . . . . . . . 16
   7. Security Considerations . . . . . . . . . . . . . . . . . . . . 18
   8. References  . . . . . . . . . . . . . . . . . . . . . . . . . . 18
     8.1 Normative References . . . . . . . . . . . . . . . . . . . . 18
     8.2 Informative References . . . . . . . . . . . . . . . . . . . 18
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