Constrained Application Protocol (CoAP) Block-Wise Transfer Options for Faster Transmission
draft-ietf-core-new-block-02
CORE M. Boucadair
Internet-Draft Orange
Intended status: Standards Track J. Shallow
Expires: May 2, 2021 October 29, 2020
Constrained Application Protocol (CoAP) Block-Wise Transfer Options for
Faster Transmission
draft-ietf-core-new-block-02
Abstract
This document specifies alternative Constrained Application Protocol
(CoAP) Block-Wise transfer options: Q-Block1 and Q-Block2 Options.
These options are similar to the CoAP Block1 and Block2 Options, not
a replacement for them, but do enable faster transmission rates for
large amounts of data with less packet interchanges as well as
supporting faster recovery should any of the blocks get lost in
transmission.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Existing CoAP Block-Wise Transfer Options . . . . . . . . 3
1.2. Alternative CoAP Block-Wise Transfer Options . . . . . . 3
1.3. Updated CoAP Response Code (4.08) . . . . . . . . . . . . 4
1.4. Applicability Scope . . . . . . . . . . . . . . . . . . . 5
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. The Q-Block1 and Q-Block2 Options . . . . . . . . . . . . . . 6
3.1. Properties of Q-Block1 and Q-Block2 Options . . . . . . . 6
3.2. Structure of Q-Block1 and Q-Block2 Options . . . . . . . 7
3.3. Using the Q-Block1 Option . . . . . . . . . . . . . . . . 8
3.4. Using the Q-Block2 Option . . . . . . . . . . . . . . . . 9
3.5. Working with Observe and Q-Block2 Options . . . . . . . . 11
3.6. Working with Size1 and Size2 Options . . . . . . . . . . 11
3.7. Use of Q-Block1 and Q-Block2 Options Together . . . . . . 11
4. The Use of 4.08 (Request Entity Incomplete) Response Code . . 11
5. The Use of Tokens . . . . . . . . . . . . . . . . . . . . . . 13
6. Congestion Control . . . . . . . . . . . . . . . . . . . . . 13
7. Caching Considerations . . . . . . . . . . . . . . . . . . . 14
8. HTTP-Mapping Considerations . . . . . . . . . . . . . . . . . 15
9. Examples of Selective Block Recovery . . . . . . . . . . . . 15
9.1. Q-Block1 Option: Non-Confirmable Example . . . . . . . . 16
9.2. Q-Block2 Option: Non-Confirmable Example . . . . . . . . 17
10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 19
10.1. New CoAP Options . . . . . . . . . . . . . . . . . . . . 19
10.2. New Content Format . . . . . . . . . . . . . . . . . . . 20
11. Security Considerations . . . . . . . . . . . . . . . . . . . 20
12. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 20
13. References . . . . . . . . . . . . . . . . . . . . . . . . . 20
13.1. Normative References . . . . . . . . . . . . . . . . . . 20
13.2. Informative References . . . . . . . . . . . . . . . . . 22
Appendix A. Examples with Confirmable Messages . . . . . . . . . 22
A.1. Q-Block1 Option . . . . . . . . . . . . . . . . . . . . . 22
A.2. Q-Block2 Option . . . . . . . . . . . . . . . . . . . . . 24
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 25
1. Introduction
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