Multipath Extension for QUIC
draft-an-multipath-quic-00
QUIC Q. An
Internet-Draft Y. Liu
Intended status: Standards Track Y. Ma
Expires: April 25, 2021 Alibaba Inc.
Z. Li
ICT-CAS
October 22, 2020
Multipath Extension for QUIC
draft-an-multipath-quic-00
Abstract
This document specifies multipath extension for the QUIC protocol to
enable the simultaneous usage of multiple paths for a single
connection.
The extension is compliant with the single-path QUIC design. The
design principle is to support multipath by adding limited extension
to QUIC-Transport [I-D.ietf-quic-transport].
Status of This Memo
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on April 25, 2021.
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An, et al. Expires April 25, 2021 [Page 1]
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Notational Conventions . . . . . . . . . . . . . . . . . . . 3
3. Sub-Connection . . . . . . . . . . . . . . . . . . . . . . . 4
4. Enable Multipath QUIC - Handshake . . . . . . . . . . . . . . 5
5. Sub-connection Management . . . . . . . . . . . . . . . . . . 5
5.1. Multipath QUIC Interaction . . . . . . . . . . . . . . . 5
5.2. Path validation and sub-connection ID negotiation . . . . 8
5.3. New sub-connection establishment . . . . . . . . . . . . 9
5.4. Close sub-connection . . . . . . . . . . . . . . . . . . 9
5.5. Sub-connection Lookup . . . . . . . . . . . . . . . . . . 10
5.6. Sub-connection migration . . . . . . . . . . . . . . . . 10
5.7. Sub-connection state machine management . . . . . . . . . 10
5.8. Sender and Receiver Connection (Sub-connection) States . 11
5.9. Use load balancer in Multipath QUIC . . . . . . . . . . . 11
6. Packet scheduling . . . . . . . . . . . . . . . . . . . . . . 11
6.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 11
6.2. Basic Static Scheduling Strategy . . . . . . . . . . . . 12
6.3. Dynamic (feedback-based) Scheduling Strategy . . . . . . 13
6.4. Application Policy-Awareness . . . . . . . . . . . . . . 14
6.4.1. Per-connection Policy . . . . . . . . . . . . . . . . 15
6.4.2. Per-stream Policy . . . . . . . . . . . . . . . . . . 17
7. Congestion control and loss detect . . . . . . . . . . . . . 18
7.1. Congestion control . . . . . . . . . . . . . . . . . . . 18
7.2. Packet number space and acknowledgements . . . . . . . . 18
7.3. Flow control . . . . . . . . . . . . . . . . . . . . . . 18
8. New frames . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.1. MP_SUB_CONN_NEW frame . . . . . . . . . . . . . . . . . . 19
8.2. MP_SUB_CONN_ACCEPT frame . . . . . . . . . . . . . . . . 19
8.3. MP_SUB_CONN_CLOSE frame . . . . . . . . . . . . . . . . . 19
8.4. MP_ACK frame . . . . . . . . . . . . . . . . . . . . . . 20
8.5. MP_ADD_ADDRESS frame . . . . . . . . . . . . . . . . . . 21
8.6. MP_REMOVE_ADDRESS frame . . . . . . . . . . . . . . . . . 21
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 21
10. Informative References . . . . . . . . . . . . . . . . . . . 21
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