Separation of Data Path and Data Flow Sublayers in the Transport Layer
draft-asai-tsvwg-transport-review-00

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Network Working Group                                            H. Asai
Internet-Draft                                        Preferred Networks
Intended status: Standards Track                         2 November 2020
Expires: 6 May 2021

 Separation of Data Path and Data Flow Sublayers in the Transport Layer
                  draft-asai-tsvwg-transport-review-00

Abstract

   This document reviews the architectural design of the transport
   layer.  In particular, this document separates the transport layer
   into two sublayers; the data path and the data flow layers.  The data
   path layer provides functionality on the data path, such as
   connection handling, path quality and trajectory monitoring, waypoint
   management, and congestion control.  The data flow layer provides
   additional functionality upon the data path layer, such as flow
   control for the receive buffer management, retransmission for
   reliable data delivery, and transport layer security.  The data path
   layer multiplexes multiple data flow layer protocols and provides
   data path information to the data flow layer to control data
   transmissions, such as prioritization and inverse multiplexing for
   multipath protocols.

Status of This Memo

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   This Internet-Draft will expire on 6 May 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Asai                       Expires 6 May 2021                   [Page 1]
Internet-Draft       Data Path and Data Flow Layers        November 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Transport Layer Functionality Review  . . . . . . . . . . . .   3
     2.1.  Conventional Layering . . . . . . . . . . . . . . . . . .   3
     2.2.  Data Path-aware Networking  . . . . . . . . . . . . . . .   4
     2.3.  Resource Management: Flow Control and Congestion
           Control . . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.4.  Multipath Protocols . . . . . . . . . . . . . . . . . . .   6
     2.5.  Reliable Data Communication . . . . . . . . . . . . . . .   6
     2.6.  Security  . . . . . . . . . . . . . . . . . . . . . . . .   7
     2.7.  Summary . . . . . . . . . . . . . . . . . . . . . . . . .   7
   3.  Specifications of Data Path Layer and Data Flow Layer . . . .   8
     3.1.  Data Path Layer . . . . . . . . . . . . . . . . . . . . .   8
       3.1.1.  In-band trajectory monitoring . . . . . . . . . . . .   8
       3.1.2.  Waypoint management . . . . . . . . . . . . . . . . .   9
       3.1.3.  Bidirectional connection establishment  . . . . . . .   9
       3.1.4.  Data path quality (congestion) monitoring and
               congestion control  . . . . . . . . . . . . . . . . .  10
       3.1.5.  Data flow multiplexing  . . . . . . . . . . . . . . .  10
       3.1.6.  Packet Duplication  . . . . . . . . . . . . . . . . .  10
     3.2.  Data Flow Layer . . . . . . . . . . . . . . . . . . . . .  10
       3.2.1.  Retransmission for reliable data communication  . . .  11
       3.2.2.  Flow control for receive-buffer management  . . . . .  11
       3.2.3.  Flow prioritization . . . . . . . . . . . . . . . . .  11
       3.2.4.  End-to-end security . . . . . . . . . . . . . . . . .  11
       3.2.5.  Inverse multiplexing for multipath protocols  . . . .  11
   4.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .  12
     4.1.  Multipath Transport Protocols . . . . . . . . . . . . . .  12
     4.2.  Congestion Control Acceleration . . . . . . . . . . . . .  13
     4.3.  In-Network Computing  . . . . . . . . . . . . . . . . . .  14
     4.4.  Flow Arbitration  . . . . . . . . . . . . . . . . . . . .  15
   5.  Implementation Considerations . . . . . . . . . . . . . . . .  16