Thrilled to share insights on an advanced feature that’s making a big difference in uplink performance—DMRS Interference Reduction for low-frequency TDD.
The Challenge
Cell-edge users in low-frequency TDD often suffer from uplink degradation due to poor DMRS (Demodulation Reference Signal) quality and increased interference—leading to reduced user experience.
The Solution
The base station adaptively allocates DMRS resources based on UE interference conditions:
High-interference UEs and low-interference UEs are given separate DMRS resources,
This minimizes resource collisions and improves demodulation accuracy,
Boosting uplink rates, especially in weak coverage.
The Results
When Uplink PRB Usage ≤ 30%:
Significant uplink performance gain at the cell edge
Greater interference = greater benefit
When Uplink PRB Usage > 30%:
No negative impact observed
How to Activate
Controlled via the parameter:
NRDUCellChnCovAlgo.UlCoverageAlgoSwitch → DMRS_RESOURCE_ADJ_SW
Part of a broader strategy under Reference Signal Interference Reduction, this feature aligns with Massive MIMO Uplink Boosting and Turbo Uplink efforts in modern 5G deployments.
Bottom Line:
A smart, adaptive enhancement that improves uplink for all—especially those on the edge of coverage—without compromising network-wide performance.
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