Frequency Domain Resource Allocation for Multipoint Transmission
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Solution Overview
Problem
Existing frequency domain resource allocation methods in new radio (NR) systems, particularly in multipoint transmission scenarios, often lead to deteriorated signal received quality for terminal devices due to interference from neighboring cells and inconsistent precoding and equalization across different transmission reception points (TRPs).
Innovation Solution
A method and apparatus for frequency domain resource allocation that ensures PRBs in the same Precoding Resource Group (PRG) are not allocated to different TRPs, using a predetermined frequency domain resource allocation rule that associates each frequency domain resource with unique Quasi Co-Location (QCL) information and allocates resources in units of a frequency domain resource allocation unit, with a minimum granularity of x consecutive Resource Blocks (RBs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency domain resources are allocated to multiple TRPs using a same FD-RA indication field in DCI, then spectrum utilization is improved and multipoint transmission is supported, but signal received quality deteriorates due to interference and inconsistent precoding
Solution Approach 1:
The patent segments the frequency domain resources by introducing a minimum granularity (x consecutive RBs) for resource allocation units. This segmentation ensures that PRBs within the same PRG are not allocated to different TRPs, thereby maintaining consistent precoding matrices for each segment while still enabling multipoint transmission across multiple segments.
Solution Approach 2:
The patent applies local quality by ensuring that each frequency domain resource allocation unit maintains consistent precoding properties locally (within the same PRG), while allowing different TRPs to use different precoding matrices for different allocation units. This local consistency resolves the signal quality issue while maintaining overall system productivity.
2Adaptability or versatility
If PRBs are allocated to different TRPs without granularity constraints, then resource allocation flexibility is improved, but precoding consistency is violated and signal quality deteriorates
Solution Approach 1:
The patent introduces segmentation at the PRG level by defining minimum granularity as x consecutive RBs. This segmentation preserves precoding consistency within each segment while allowing flexible allocation across segments, thus maintaining both adaptability and manufacturing precision.
Solution Approach 2:
The patent changes the allocation parameter from individual PRB level to PRG level (x consecutive RBs). This parameter change maintains precoding consistency by ensuring entire PRGs are allocated together to the same TRP, while still providing flexibility through configurable granularity size x.
Data Source
AI summary
Example frequency domain resource allocation methods and apparatus are described. One example method includes determining M frequency domain resources according to a predetermined frequency domain resource allocation rule, and performing communication on one or more of the M frequency domain resources. Any two of the M frequency domain resources do not overlap. Each of the M frequency domain resources is associated with one piece of quasi-colocation (QCL) information, and any two of the M frequency domain resources are associated with different QCL information.