UE Capability Reporting for Narrow-Bandwidth Port Selection Codebooks
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing UE capability reporting for port selection codebooks, particularly in scenarios with limited bandwidth, leading to increased implementation complexity.
Innovation Solution
A method for UE and network devices to manage port selection codebook reporting by defining specific parameter combinations and thresholds, allowing for optimized reporting and configuration based on available bandwidth, thereby reducing implementation complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the UE reports port selection codebooks in narrow bandwidth scenarios (active BWP has less than threshold number of PRBs), then the reporting completeness is improved, but the UE implementation complexity increases
Solution Approach 1:
The patent applies local quality by differentiating the reporting behavior based on the active bandwidth part size. When the active BWP has less than a threshold number of PRBs, the UE assumes predefined values for a subset of parameters (M, α, β, R) instead of reporting them. This localized adaptation to narrow bandwidth conditions reduces the reporting overhead and UE complexity specifically in those scenarios while maintaining full reporting capability in wider bandwidth scenarios.
2Device complexity
If the UE operates according to the rule that it is not expected to report port selection codebooks in narrow bandwidth scenarios, then the UE implementation complexity is reduced, but the reporting completeness deteriorates
Solution Approach 1:
The patent changes the parameter reporting behavior based on the active BWP size. Specifically, when the active BWP has less than a threshold number of PRBs, the UE assumes predefined values for parameters M (number of selected frequency basis), α (percentage of number of selected ports), β (percentage of number of reported non-zero coefficients), and R (number of PMI sub-bands per CQI sub-band). This parameter change approach allows the system to adapt the reporting complexity to the available bandwidth, reducing UE implementation complexity in narrow bandwidth scenarios.
3Reliability
If the BS configures the UE with port selection codebooks in narrow bandwidth scenarios, then the system performance is improved, but the UE implementation complexity increases
Solution Approach 1:
The patent introduces dynamic behavior where the UE's reporting and assumption of parameters depends on the configured active bandwidth part size. The system dynamically adjusts between full reporting mode (when active BWP has sufficient PRBs) and assumption mode (when active BWP has less than threshold PRBs). This dynamic adaptation allows the system to optimize performance by using port selection codebooks when needed while managing UE complexity through conditional behavior.
Data Source
AI summary
Provided is a method for a user equipment (UE). The UE performs at least one of: reporting, to a base station (BS), a UE capability related to port selection codebooks, in accordance with a determination that an active bandwidth part (BWP) has less than a threshold number of physical resource blocks (PRBs), operating according to a rule that the UE is not expected to report, to the BS, the port selection codebooks, or in accordance with a determination that the active BWP has less than the threshold number of PRBs and that the UE is configured with the port selection codebooks by the BS, assuming that a subset of parameters has a predefined value, wherein the parameters comprise a number, M, of selected frequency basis, a percentage, α, of number of selected ports, a percentage, β, of number of reported non-zero coefficients, and a number, R, of precoding matrix indicator (PMI) sub-bands per channel quality information (CQI) sub-band.