5G • 5G-Advanced (Rel-18)
XR Jitter Mitigation
Radio-Layer Packet Delay Variation (PDV) Suppression
Jitter-reduction mechanism in gNodeB MAC schedulers that smooths packet inter-arrival times, preventing video decoder stutter.
Technical Explanation
Packet Delay Variation (jitter) forces video decoders to maintain large jitter buffers, introducing unwanted latency into interactive communications. Rel-18 introduces jitter mitigation algorithms in the gNodeB scheduler that dynamically adjust transmission grant priorities, delivering video packets with deterministic sub-millisecond arrival predictability.
Key Functions
- Suppresses radio packet delay variation (jitter) below 2 milliseconds
- Enables terminal video decoders to shrink jitter buffers, slashing total interactive latency
- Prevents periodic video frame stutter and audio distortion during multi-user cell congestion
- Optimizes packet de-jittering queues across both terminal and base station buffers
Specifications
3GPP TR 38.835, TS 38.300 (Rel-18)
Interfaces
Uu (MAC Layer)
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