PTRS Resource Mapping for DMRS Interference Randomization
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Solution Overview
Problem
In new radio (NR) communication systems, the demodulation reference signal (DMRS) and phase tracking reference signal (PTRS) experience interference due to mutual mapping on the same resource elements, affecting phase noise estimation.
Innovation Solution
A method to determine resource block and resource element offsets based on DMRS port numbers, radio network temporary identifiers, and configuration types to randomize PTRS interference by mapping PTRSs to different resource blocks and elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If PTRS is mapped to resource elements in resource blocks with fixed quantity, then the mapping process is simple, but mutual interference occurs between PTRS of different DMRS ports affecting phase noise estimation
Solution Approach 1:
The patent applies dynamics by making the resource block offset dynamic rather than fixed. The offset is determined based on the DMRS port number, terminal device identifier, and configuration information, allowing the mapping position to vary adaptively. This dynamic adjustment prevents fixed-position interference while maintaining systematic mapping, thereby improving phase noise estimation accuracy without overly complicating the mapping process.
Solution Approach 2:
The patent changes the parameter of resource block offset based on multiple factors including DMRS port number, terminal device identifier, and configuration information. By varying this parameter dynamically, the system randomizes the interference pattern of PTRS across different resource blocks, transforming the harmful fixed interference into randomized interference that averages out, thus improving estimation accuracy.
2Device complexity
If PTRS mapping position is fixed, then implementation is straightforward, but interference randomization degree is insufficient
Solution Approach 1:
The patent implements parameter changes by determining the resource block offset based on multiple variables: DMRS port number, terminal device identifier, and configuration information. This multi-parameter approach increases interference randomization effectiveness while keeping the implementation relatively simple through systematic calculation rules, achieving a balance between complexity and measurement precision.
Solution Approach 2:
The patent uses the terminal device identifier (such as RNTI) as a copying mechanism to generate different offset values. The identifier acts as a template that produces varied mapping positions through mathematical operations (modulo, division), creating randomized interference patterns without requiring complex random number generators or sophisticated algorithms.
3Quantity of substance
If multiple PTRS map to the same resource element, then resource utilization is high, but mutual interference occurs and phase noise estimation is affected
Solution Approach 1:
The patent applies segmentation by dividing the resource block into different offset groups based on DMRS port numbers. Different DMRS ports are assigned different resource block offsets, effectively segmenting the resource elements into distinct groups. This segmentation prevents multiple PTRS from mapping to the same resource element, eliminating mutual interference while maintaining efficient resource utilization through systematic distribution.
Solution Approach 2:
The patent implements local quality by assigning different mapping characteristics to different DMRS ports. Each port receives a customized offset value based on its port number, terminal identifier, and configuration, creating locally optimized mapping positions. This ensures that interference is minimized for each specific port while maintaining overall system efficiency.
Data Source
AI summary
This application discloses a communication method, including: obtaining a demodulation reference signal port number, where the demodulation reference signal port number is for determining a resource block offset and a resource element offset; determining a resource element of a phase tracking reference signal based on the resource block offset and the resource element offset; and sending or receiving the phase tracking reference signal based on the resource element of the phase tracking reference signal. In various embodiments, PTRSs corresponding to different DMRS port numbers may be mapped to different resource blocks.