ZP CSI-RS Location Determination in 5G NR SS Block Overlaps
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Solution Overview
Problem
In 5G NR communication systems, determining the resource location of a Zero Power Channel State Information Reference Signal (ZP CSI-RS) when it overlaps with a Synchronization Signal (SS) block is challenging due to inconsistencies in the Physical Resource Block (PRB) grids for data transmission.
Innovation Solution
A method where a terminal device determines whether a Resource Element (RE) includes a ZP CSI-RS by identifying overlaps with maximum-frequency and minimum-frequency PRBs, using configuration information and patterns to accurately locate the ZP CSI-RS even when the PRB grids for the SS block are inconsistent with common PRB grids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the PRB grid for SS block is not aligned with common PRB grid, then flexibility in resource allocation is improved, but difficulty in determining ZP CSI-RS resource location increases
Solution Approach 1:
The patent segments the PRB grid into two distinct types: SS block PRB grid and common PRB grid. By identifying which grid type is being used, the system can apply appropriate resource location determination methods for ZP CSI-RS, thus resolving the ambiguity caused by grid misalignment while maintaining allocation flexibility.
Solution Approach 2:
The patent changes the parameter of PRB grid alignment by allowing offset configurations between SS block PRB grid and common PRB grid. Through parameter settings (such as subcarrier spacing and frequency offsets), the system can adaptively determine ZP CSI-RS resource locations even when grids are not perfectly aligned, solving both flexibility and determination difficulty.
2Productivity
If ZP CSI-RS bandwidth overlaps with SS block bandwidth, then resource utilization is improved, but interference between signals increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring ZP CSI-RS resource locations based on the determined PRB grid type and offset parameters. By determining the grid type beforehand and calculating expected ZP CSI-RS locations in advance, the system can identify and avoid overlapping regions with SS block, thus preventing interference while maintaining high resource utilization.
Solution Approach 2:
The patent introduces an intermediary mechanism through the use of PRB grid type identification and offset parameters. This intermediary layer allows the system to mediate between ZP CSI-RS and SS block resource allocation, enabling overlap when beneficial for utilization while preventing overlap when it would cause interference, based on the specific grid configuration.
Data Source
AI summary
The application provides a signal transmission method, a terminal device and a network device. In the method, transmission of a Primary Synchronization Signal (PSS) in an SS block occupies M PRBs, a ZP CSI-RS is located on N PRBs. In a case where the ZP CSI-RS is located on a symbol occupied by the SS block, the terminal device determines that at least one first RE does not include the ZP CSI-RS or determines that the at least one first RE includes the ZP CSI-RS, the at least one first RE being at least one RE, except one or more REs overlapped with the maximum-frequency PRB in the M PRBs, in a first PRB, and/or, the at least one first RE being at least one RE, except one or more REs overlapped with the minimum-frequency PRB in the M PRBs, in a second PRB