[Moq] New draft: Conditional Range Filters for MOQT

["Yu You (Nokia)" <[e-mail]>]

Hi all,


We would like to request comments on a new draft: "Conditional Range Filters for Media over QUIC Transport".


Link: https://datatracker.ietf.org/doc/draft-yuyou-conditional-filtering/


TL;DR

Currently, MOQT Range Filters are static. Any change to a filter requires a REQUEST_UPDATE round trip, which introduces reaction delays during network congestion. We propose a new RANGE_FILTER_CONDITION parameter that binds a Range Filter SetID to autonomous relay-side evaluation logic.

This allows a relay to dynamically activate or deactivate specific filter sets at group boundaries based on real-time metrics (like throughput thresholds) without requiring further signaling from the subscriber.


Key Technical Points

  *
Compatibility with Range Filter Sets: This proposal is designed to be fully compatible with existing MOQT SetID-based Range Filters. The conditional logic determines only whether a specific SetID participates in the established OR-combination at a given switching point. This preserves the core AND/OR semantics of the base protocol, allowing conditional and unconditional filter sets to coexist naturally within a single subscription.
  *   Explicit Signaling of Omissions: To help subscribers distinguish between network loss and intentional filtering, the draft introduces a new PRIOR_SUBGROUP_ID_GAP Object Property. This allows the relay to signal when subgroups have been skipped due to active filter conditions.
  *   Alignment with SSTS: The condition model intentionally reuses the design from Sender-Side Track Switching (SSTS). It applies the same threshold/weight/rank semantics and bandwidth allocation approach at the relay for intra-track filtering.


Implementation and Testing


To facilitate a better understanding of the proposal, we have implemented the conditional range filter feature in our MOQT V19 Relay server, including a simulated bandwidth API for testing.


Technical details and the API spec, plus a demo video can be found here: https://moqt.nokiaresearch.com:8080/static/open/range_filter_condition.html


Feedback is welcome on the list or via the GitHub issue tracker: https://github.com/yuyou/conditional_filtering.


Thanks,


Yu You