Mass events duplicate delivery
Everyone watches the same bits, but unicast sends them user-by-user.
For mass events & live streaming
Stop sending the same stream millions of times.
QUICast combines the efficiency of multicast with QUIC’s modern transport features: secure verification metadata, reliability mechanisms, and seamless unicast fallback.
Efficiency
Network replication
Security
Unicast verification
Resilience
Unicast fallback
Experience
Better synchronization
The problem
Unicast streaming scales cost linearly with viewers — exactly when demand peaks.
Infrastructure strain
Origins, CDNs and backbones need expensive overprovisioning for peak hours.
Delay spread
Unicast variability creates large viewer-to-viewer latency differences.
The solution
Multicast efficiency upgraded with QUIC-era security, verification, and reliability patterns.
One-to-many transport
Send once. Let the network replicate packets efficiently to many receivers.
Secure verification channel
Send verification metadata via secure unicast; clients validate multicast payloads.
Graceful fallback
When multicast isn’t available, clients switch to unicast without breaking playback.
Bandwidth & cost savings
Open standards
Secure verification
Hybrid multicast + unicast
Mass-scale synchronization
How it works
A practical architecture: multicast payload delivery plus unicast verification and fallback.
Components
- Server-side QUIC extension integrated with existing QUIC stacks
- Client support (apps and/or browsers) to join multicast and validate packets
Goal: deployable in real networks — multicast where available, unicast everywhere else.
High-level flow
Publisher
→
Multicast network
→
Viewers
Secure unicast metadata
→
Validate + fallback
Unicast delivers verification metadata; clients validate multicast packets and switch to unicast if needed.
Development status
Research exists — commercialization needs hardening, tooling, and client integrations.
Current state
QUIC multicast extensions exist today but are not yet production-ready at scale.
What’s needed
Robust client implementations, operational tooling, and real-world operator/ISP pilots.
Next steps
Pilots focused on measurable bandwidth savings and synchronization improvements.
Contact
Want a pilot discussion, integration path, or technical deep dive?
© QUICast