SRS Puncturing at Different SCS Boundaries
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the context of 5G New Radio (NR), there is a lack of effective methods for generating SRS code sequences when they are placed at boundaries between frequency resources with different subcarrier spacings or overlap with non-SRS channels, leading to inter-numerology interference and potential deterioration in CM/PAPR and cross-correlation properties.
Innovation Solution
A terminal and communication method that punctures the SRS at the boundary between frequency resources with different subcarrier spacings or overlaps with other channels, adjusting the puncture size based on parameters such as subcarrier spacing, extended part size, channel type, and power spectral density, and switches to alternative SRS generation methods to maintain properties like low PAPR and cross-correlation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SRS is placed at boundary between frequency resources of different SCSs, then frequency resource utilization is improved, but inter-numerology interference increases
Solution Approach 1:
The patent extracts and removes the interfering SRS signal components at the boundary regions between different SCS frequency resources. By identifying and eliminating the specific portions of SRS that cause inter-numerology interference, the system maintains high frequency resource utilization while preventing harmful interference to adjacent numerologies.
Solution Approach 2:
The patent applies different quality characteristics to different parts of the SRS signal. At boundary regions between different SCSs, the SRS signal is modified or removed to have lower power or different properties, while interior regions maintain full signal strength. This local differentiation resolves the contradiction by allowing high utilization in safe regions while minimizing interference at critical boundary zones.
2Object-affected harmful factors
If SRS is punctured to avoid overlap with other channels, then channel interference is reduced, but SRS transmission quality deteriorates
Solution Approach 1:
The patent performs preliminary identification of potential overlap regions between SRS and other channels before actual transmission. By pre-calculating and marking the puncture locations based on scheduled channel assignments, the system can prepare appropriate puncturing patterns in advance, minimizing the impact on SRS quality while ensuring no interference with other channels occurs.
Solution Approach 2:
The patent applies partial puncturing only to the extent necessary to avoid channel overlaps, rather than completely removing or severely degrading the SRS signal. By selectively puncturing only the overlapping portions while preserving the majority of the SRS transmission, the system reduces channel interference to the minimum required level while maintaining acceptable SRS transmission quality for reliable operation.
3Reliability
If Zadoff-Chu sequence is used for SRS, then CM/PAPR and cross-correlation properties are improved, but sequence generation becomes complex at boundaries
Solution Approach 1:
The patent segments the Zadoff-Chu sequence generation process into distinct regions: interior regions use the full complex Zadoff-Chu sequence for optimal CM/PAPR and cross-correlation properties, while boundary regions use simplified or truncated versions. This segmentation allows the system to maintain the desirable properties of Zadoff-Chu sequences where needed while reducing generation complexity at problematic boundary locations between different SCSs.
Data Source
AI summary
A terminal includes: a circuit that, on the basis of a parameter of a first frequency resource assigned a reference signal (SRS) and a parameter of a second frequency resource, adjacent to the first frequency resource, that uses a subcarrier spacing (SCS) which is different from that used by the first frequency resource, punctures the reference signal at a boundary between the first frequency resource and the second frequency resource; and a radio transmitter that transmits the reference signal thus punctured.