Dynamic PTRS Mapping for Phase Noise Compensation
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Solution Overview
Problem
Current phase-tracking reference signal (PTRS) mapping techniques are insufficient in dynamic scenarios, such as slot aggregation with or without DMRS subsampling, leading to inadequate phase noise compensation in wireless communication networks.
Innovation Solution
The proposed solution involves determining whether a PTRS will not be transmitted based on a first mapping value and identifying an alternative mapping value or mapping the PTRS relative to a symbol where a DMRS is muted, allowing for dynamic PTRS mapping to ensure effective phase noise compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If PTRS mapping is performed using a fixed mapping value, then the mapping process is simple, but phase noise compensation becomes inadequate in dynamic scenarios such as slot aggregation with DMRS subsampling
Solution Approach 1:
The patent implements dynamic PTRS mapping by determining whether to transmit PTRS based on the relationship between mapping values and DMRS symbol positions. The system adapts the PTRS transmission decision according to dynamic slot aggregation configurations and DMRS subsampling patterns, rather than using a fixed mapping approach. This resolves the contradiction by making the mapping process dynamic rather than static, ensuring reliable phase noise compensation in varying network conditions.
Solution Approach 2:
The patent changes the parameter of PTRS mapping by introducing a determination step that compares the mapping value with the position of DMRS symbols. When the mapping value indicates a DMRS symbol position (especially when DMRS is muted or subsampled), the system changes the PTRS transmission parameter to avoid transmission, preventing gaps in phase tracking. This parameter adaptation ensures reliable phase noise compensation without requiring complex dynamic remapping.
2Ease of manufacture
If PTRS is transmitted according to a mapping value that aligns with DMRS symbols, then mapping is straightforward, but gaps in PTRS transmission occur when DMRS is muted or subsampled
Solution Approach 1:
The patent applies preliminary anti-action by determining in advance whether a PTRS transmission would coincide with a muted or subsampled DMRS symbol before actually transmitting PTRS. The system preemptively identifies potential gaps in phase tracking coverage and prevents PTRS transmission in those specific resource elements. This approach maintains straightforward mapping configuration while ensuring transmission continuity by avoiding positions where PTRS would be ineffective.
Solution Approach 2:
The patent introduces an intermediary determination step that acts as a mediator between the PTRS mapping configuration and the actual transmission. This intermediary layer checks whether the mapped PTRS position aligns with muted or subsampled DMRS symbols and adjusts the transmission decision accordingly. This intermediary mechanism ensures PTRS transmission continuity without requiring complex remapping, maintaining ease of configuration while preventing transmission gaps.
3Device complexity
If a single mapping value is used for PTRS transmission, then configuration is simple, but performance degrades in dynamic scenarios with slot aggregation and DMRS subsampling
Solution Approach 1:
The patent implements dynamics by making the PTRS transmission decision adaptive to the actual downlink slot aggregation configuration and DMRS subsampling pattern. Instead of relying on a single fixed mapping value, the system dynamically determines whether to transmit PTRS based on the relationship between the mapping value and the actual positions of DMRS symbols in the aggregated slot. This dynamic approach maintains simple configuration while significantly improving phase noise compensation performance in dynamic scenarios.
Solution Approach 2:
The patent changes the transmission parameter of PTRS based on the determined relationship between mapping values and DMRS symbol positions. When the mapping value indicates a position where DMRS is muted or subsampled, the system changes the PTRS transmission parameter to prevent transmission at that position. This parameter adaptation allows the system to maintain simple single-value mapping configuration while achieving reliable phase noise compensation performance in dynamic slot aggregation scenarios.
Data Source
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AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may determine that a phase-tracking reference signal (PTRS) will not be transmitted based at least in part on a mapping value associated with transmitting the PTRS, and may identify another mapping value associated with transmitting the PTRS, wherein the other mapping value is different from the mapping value. In some aspects, a wireless communication device may identify a symbol in which a demodulation reference signal (DMRS) is to be muted, and may map, based at least in part on a mapping value configured on the wireless communication device, a PTRS relative to the symbol in which the DMRS is to be muted. Numerous other aspects are provided.