QUIC Working Group D. Liu
Internet-Draft X. Yu
Intended status: Informational Alibaba Group
Expires: April 28, 2022 October 25, 2021
Multipath-QUIC Use Cases
draft-liu-quic-mpquic-usecase-00
Abstract
This draft introduces the use cases of multipath QUIC.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [1].
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 28, 2022.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Use Case 1: Redundant Transmission . . . . . . . . . . . . . 2
3. Use Case 2: bandwidth Aggregation . . . . . . . . . . . . . . 2
4. Use Case 3: Use Cases in 5G Core Network . . . . . . . . . . 2
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 3
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
7. Security Considerations . . . . . . . . . . . . . . . . . . . 4
8. Normative References . . . . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 4
1. Introduction
This draft introduces multipath QUIC use cases.
2. Use Case 1: Redundant Transmission
For applications such as Internet live video broadcasting, the user
experience is very sensitive to delay. Especially for outdoor
Internet live video broadcasting, the broadcasting device may equip
two more cellphone cards to enable stable and robust network
connection.
In this case, multipath QUIC can provide redundant transmission over
multiple network connections to improve user experience. For
example, when some broadcasting packets were lost in one network
connection, the redundant packets can be transmitted immediately by
another connection without waiting for the timeout of the
acknowledgements packets.
3. Use Case 2: bandwidth Aggregation
For applications such as file download etc., if the device has
multiple network access, for example, most smart phone today have
both Wi-Fi and cellular network access, multipath QUIC can be used
for bandwidth aggregation to accelerate the download speed.
4. Use Case 3: Use Cases in 5G Core Network
Use case 3.1: 5GS is required to extend the bandwidth for the
applications, such as high resolution video streaming. To achieve
this purpose, the application is enabled to be access via different
RAN, for example, different wireless access from PLMNs. Since 5GS
can only support multipath for TCP and can not support multipath
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functionality for non-TCP traffic, there is an urgent need for the
multipath transport protocol for non-TCP traffic. The traffic
splitting functionality in 5GS can be further enhanced by adopting
QUIC with multipath extension, ensuring the bandwidth requirement for
applications, such as high resolution video streaming.
The NF (e.g. UPF) within 5GC may take charge of the QUIC multipath
extension proxy functionality, which communicate with the multipath
functionality in the client by using the QUIC multipath extension
protocol.
The ongoing discussion on 3GPP SA2 ATSSS R18 study item covers the
research item and related requirement for the continue study of
traffic splitting by considering the QUIC with multipath extension.
The link for the draft of the study item is:
https://www.3gpp.org/ftp/tsg_sa/WG2_Arch/TSGS2_147E_Electronic_2021-
10/Docs/S2-2107635.zip
Use case 3.2: 5GS is required to ensure the reliability and QoE for
applications, such as live video streaming, video on demand, etc. To
achieve this purpose, the application is enabled to be accessed via
different wireless paths, for example, 5G and Wi-Fi. However, due to
the varied wireless environment, the packet sent by one path might be
lost because of the poor signal and/or wireless interference. In
this case, redundant transmission based on multipath is needed for
guaranteeing reliability and QoE once the performance of the original
path is deteriorated. The alternative path(s) may be able to send
duplicated packets to the client in order to ensure the QoE.
The NF (e.g. UPF) within 5GC may take charge of the QUIC multipath
extension proxy functionality, which communicate with the multipath
functionality in the client by using the QUIC multipath extension
protocol.
3GPP SA2 has an ongoing discussion on ATSSS R18 study item. The
redundant steering functionality has been written in the latest
draft, which reflects the requirement on the redundant transmission.
The link for the draft is: https://www.3gpp.org/ftp/tsg_sa/WG2_Arch/
TSGS2_147E_Electronic_2021-10/Docs/S2-2107635.zip
5. Acknowledgements
6. IANA Considerations
This memo includes no request to IANA.
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7. Security Considerations
None
8. Normative References
[1] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", March 1997,
<http://xml.resource.org/public/rfc/html/rfc2119.html>.
[2] Rose, M., "Writing I-Ds and RFCs using XML", RFC 2629,
DOI 10.17487/RFC2629, June 1999,
<https://www.rfc-editor.org/info/rfc2629>.
Authors' Addresses
Dapeng(Max) Liu
Alibaba Group
Email: max.ldp@alibaba-inc.com
Xiaobo Yu
Alibaba Group
Email: shibo.yxb@alibaba-inc.com
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