PUCCH PUSCH DMRS Bundling Duration Phase Coherence
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in maintaining transmit phase coherence for demodulation reference signals (DMRS) during bundling, which affects channel estimation and overall communication efficiency.
Innovation Solution
The method involves transmitting a first indication of a maximum DMRS bundling duration to a network entity, receiving a second indication of DMRS bundling activation or duration, and transmitting uplink repetitions with bundled DMRS based on the received indications to maintain phase coherence and improve channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DMRS bundling duration is extended to improve channel estimation robustness, then measurement precision improves, but maintaining transmit phase coherence becomes more difficult
Solution Approach 1:
The patent implements dynamic DMRS bundling duration configuration where the network can adaptively adjust the bundling duration based on channel conditions and phase coherence requirements. The system transitions from fixed bundling duration to flexible, dynamically configurable duration that can be optimized for different scenarios, allowing longer bundling when phase coherence can be maintained and shorter bundling when phase coherence becomes difficult to maintain.
Solution Approach 2:
The patent introduces new configurable parameters including maximum DMRS bundling duration, actual DMRS bundling duration, and phase coherence indication parameters. These parameters enable fine-grained control over the DMRS bundling process, allowing the system to optimize the balance between channel estimation robustness and phase coherence maintenance by adjusting parameter values based on specific operational conditions.
2Measurement precision
If DMRS bundling is activated to enhance channel quality estimation, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent implements self-service mechanisms where the UE autonomously determines phase coherence based on preconfigured criteria and automatically adjusts DMRS bundling behavior without requiring complex network control. The system uses preconfigured maximum bundling durations and automatic phase coherence checks that enable the device to manage its own DMRS bundling process, reducing the complexity of coordination while maintaining measurement precision.
Solution Approach 2:
The patent segments the DMRS bundling management into distinct functional components: phase coherence determination, bundling duration selection, and actual DMRS transmission. This segmentation allows each component to be optimized independently, with the phase coherence check being a simple binary determination and the bundling duration being selected from preconfigured options, thereby reducing overall device complexity while maintaining channel quality estimation accuracy.
3Reliability
If maximum DMRS bundling duration is increased to maintain phase coherence, then reliability improves, but loss of time in signaling configuration increases
Solution Approach 1:
The patent implements preliminary configuration of maximum DMRS bundling duration and phase coherence parameters during connection setup or reconfiguration phases. By preconfiguring these parameters in advance, the system eliminates the need for frequent signaling exchanges during actual DMRS transmission, as the UE can autonomously apply the preconfigured settings. This preliminary action reduces signaling overhead while ensuring phase coherence is maintained through the predetermined maximum bundling duration.
Solution Approach 2:
The patent implements feedback mechanisms where the network receives phase coherence status reports from the UE and adjusts DMRS bundling configuration accordingly. The feedback loop allows the system to optimize the balance between phase coherence maintenance and signaling overhead by only adjusting parameters when necessary, rather than continuously signaling. The network can extend or reduce bundling duration based on actual phase coherence conditions, minimizing unnecessary signaling while maintaining reliability.
Data Source
AI summary
This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media, for PUCCH/PUSCH DMRS bundling. A UE may transmit, to a network entity, a first indication of a maximum DMRS bundling duration for maintaining transmit phase coherence for transmitted DMRS. The UE may receive, from the network entity based on the first indication of the maximum DMRS bundling duration, a second indication of at least one of a DMRS bundling activation or a DMRS bundling duration. Based on the at least one of the DMRS bundling activation or the DMRS bundling duration, the UE may transmit at least one UL repetition including bundled DMRS.