[tsvwg] RFC 9897 on Datagram Congestion Control Protocol (DCCP) Extensions for Multipath Operation with Multiple Addresses

A new Request for Comments is now available in online RFC libraries.

        RFC 9897

        Title:      Datagram Congestion Control Protocol (DCCP) 
                    Extensions for Multipath Operation with Multiple 
                    Addresses 
        Author:     M. Amend, Ed.,
                    A. Brunstrom,
                    A. Kassler,
                    V. Rakocevic,
                    S. Johnson
        Status:     Standards Track
        Stream:     IETF
        Date:       January 2026
        Mailbox:    markus.amend@telekom.de,
                    anna.brunstrom@kau.se,
                    andreas.kassler@kau.se,
                    veselin.rakocevic.1@city.ac.uk,
                    stephen.h.johnson@bt.com
        Pages:      46
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-tsvwg-multipath-dccp-24.txt

        URL:        https://www.rfc-editor.org/info/rfc9897

        DOI:        10.17487/RFC9897

Datagram Congestion Control Protocol (DCCP) communications, as
defined in RFC 4340, are inherently restricted to a single path per
connection, despite the availability of multiple network paths
between peers. The ability to utilize multiple paths simultaneously
for a DCCP session can enhance network resource utilization, improve
throughput, and increase resilience to network failures, ultimately
enhancing the user experience.

Use cases for Multipath DCCP (MP-DCCP) include mobile devices (e.g.,
handsets and vehicles) and residential home gateways that maintain
simultaneous connections to distinct network types such as cellular
and Wireless Local Area Networks (WLANs) or cellular and fixed access
networks. Compared to existing multipath transport protocols, such as
Multipath TCP (MPTCP), MP-DCCP is particularly suited for
latency-sensitive applications with varying requirements for
reliability and in-order delivery.

This document specifies a set of protocol extensions to DCCP that
enable multipath operations. These extensions maintain the same
service model as DCCP while introducing mechanisms to establish and
utilize multiple concurrent DCCP flows across different network
paths.

This document is a product of the Transport and Services Working Group Working Group of the IETF.

This is now a Proposed Standard.

STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements.  Please refer to the current edition of the Official
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standardization state and status of this protocol.  Distribution of this 
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