Adaptive Port Selection Codebook for Reliable Partial-Reciprocity CSI
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently configuring and triggering channel state information (CSI) reporting for partial reciprocity-based port selection codebooks, particularly in 5G New Radio (NR), due to limitations in uplink control signaling, resource allocation, and the high demand for trigger states, which can lead to unreliable CSI reporting and increased computational complexity.
Innovation Solution
A novel adaptive port-selection codebook configuration is introduced, which includes fields for partial-reciprocity based PMI reporting, associating CSI trigger states with SRS resource sets, and enabling dynamic activation/deactivation of partial reciprocity operations through downlink signaling, to optimize CSI reporting and reduce payload without impacting other uplink reference signal procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If partial reciprocity-based port selection codebook configuration is implemented, then beam direction estimation reliability is improved, but the number of CSI trigger states increases and computational complexity increases
Solution Approach 1:
The patent segments the codebook into two parts: a first codebook for wideband spatial support and a second codebook for frequency-selective information. This segmentation allows the UE to report only the necessary frequency-selective PMI information (partial reciprocity) rather than full wideband PMI, reducing the number of trigger states needed while maintaining beam direction estimation reliability.
Solution Approach 2:
The patent implements partial reciprocity by having the UE report only the frequency-selective PMI information from the second codebook rather than the complete wideband PMI from the first codebook. This partial action reduces the computational complexity and trigger state requirements while sufficient for maintaining reliable beam direction estimation in the context of downlink precoding.
2Reliability
If partial reciprocity-based port selection codebook configuration is implemented, then beam direction estimation reliability is improved, but computational complexity at UE increases
Solution Approach 1:
The codebook is segmented into wideband spatial support (first codebook) and frequency-selective information (second codebook). The UE only needs to process and report from the second codebook for frequency-selective PMI, significantly reducing computational complexity compared to processing the entire first codebook while maintaining estimation reliability.
Solution Approach 2:
The UE performs partial processing by only evaluating and reporting frequency-selective PMI information from the second codebook rather than performing complete codebook processing. This partial action reduces computational burden at the UE while maintaining sufficient reliability for beam direction estimation.
3Productivity
If adaptive port selection codebook configuration is used, then CSI reporting efficiency is improved, but configuration complexity increases
Solution Approach 1:
The patent creates a universal codebook configuration structure that serves multiple functions: the first codebook provides wideband spatial support for all scenarios, while the second codebook provides frequency-selective information for partial reciprocity operations. This multi-functional design improves CSI reporting efficiency across different scenarios without requiring separate configurations for each case.
Solution Approach 2:
The patent implements dynamic configuration where the network can adaptively select which codebook(s) to use based on the specific operational requirements. The gNB can dynamically determine whether to use full reciprocity (first codebook only) or partial reciprocity (second codebook only), providing flexibility that improves efficiency without requiring the UE to always handle the most complex configuration.
Data Source
AI summary
A method, apparatus, and a computer-readable storage medium are provided for partial reciprocity-based adaptive port selection codebook configuration. A method, apparatus, and a computer-readable storage medium are provided for partial reciprocity-based adaptive port selection codebook configuration. In an example implementation, the method may include a user equipment receiving at least one channel state information reporting configuration from a network node, the at least one channel state information reporting configuration including precoding matrix indicator as reporting quantity and an adaptive port selection codebook configuration for the precoding matrix indicator and determining whether partial reciprocity operations for adaptive port selection precoding matrix indicator are activated, the determining based at least on information in a sounding reference signal (SRS) request field of a downlink control information, an active semi-persistent SRS, or a periodic SRS configured by higher layers.