PUSCH PTRS Port Mapping for Multi-Beam Phase Tracking
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Solution Overview
Problem
Existing 3GPP technical specifications face challenges in efficiently determining the number of phase tracking reference signal (PTRS) ports and their association with DMRS ports for physical uplink shared channel (PUSCH) transmissions, especially when multiple beams and precoders are used, leading to complications in phase noise compensation.
Innovation Solution
The solution involves determining the number of PTRS ports and their association with DMRS ports for each PUSCH repetition by employing various options, including using a single port for all repetitions, maintaining a consistent number of ports across all repetitions, or individually determining ports for each repetition, and utilizing control signaling such as DCI and RRC to manage PTRS-to-DMRS associations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple PTRS ports are used for PUSCH repetitions with multiple beams and precoders, then phase noise compensation accuracy is improved, but system complexity and difficulty in determining port associations increase
Solution Approach 1:
The patent segments the PUSCH repetitions into different repetition sets, where each set shares common SRI/TPMI configurations. For each repetition set, a specific number of PTRS ports is determined based on the beam and precoder characteristics of that set. This segmentation allows phase noise compensation to be optimized for each beam/precoder combination without requiring a single complex configuration for all repetitions, thereby improving compensation accuracy while managing system complexity through structured division.
Solution Approach 2:
The patent applies local quality by allowing different numbers of PTRS ports to be used for different repetition sets based on their specific beam and precoder configurations. Rather than uniformly applying the same PTRS port configuration across all repetitions, the system adapts the PTRS port count to match the local characteristics (beam direction, precoder type) of each repetition set, optimizing phase noise compensation for each local context while avoiding the complexity of a fully unified approach.
2Measurement precision
If PTRS ports are individually determined for each PUSCH repetition, then phase tracking accuracy is improved, but signaling overhead and control complexity increase
Solution Approach 1:
The patent merges the determination of PTRS port configurations at the repetition set level rather than at the individual repetition level. By grouping repetitions with common SRI/TPMI configurations into repetition sets and determining a single PTRS port count for each set, the system achieves phase tracking accuracy comparable to individual determination while significantly reducing signaling overhead. The base station signals the PTRS port configuration per repetition set rather than per repetition, eliminating redundant signaling for repetitions within the same set.
Solution Approach 2:
The patent implements universality by creating a unified PTRS port determination rule that applies to all repetitions within a repetition set. The same PTRS port configuration serves multiple repetitions that share common beam and precoder characteristics, making the PTRS ports multi-functional across different repetitions. This universal approach reduces the need for individual configuration signaling while maintaining effective phase tracking for all repetitions in the set.
3Device complexity
If consistent number of PTRS ports is used across all PUSCH repetitions, then system complexity is reduced, but phase noise compensation performance deteriorates when beams and precoders change
Solution Approach 1:
The patent introduces dynamics by allowing the number of PTRS ports to vary across different repetition sets based on their beam and precoder configurations. Rather than using a fixed uniform configuration, the system dynamically adapts the PTRS port count to match the characteristics of each repetition set. This dynamic approach maintains relatively simple signaling (one configuration per repetition set) while ensuring that phase noise compensation performance is optimized for each specific beam/precoder combination, avoiding the performance deterioration that would occur with a completely static configuration.
Data Source
AI summary
The present application relates to devices and components including apparatus, systems, and methods for physical uplink shared channel transmissions with repetitions on different transmit beams with phase tracking reference signals.