CSI-RS Processing Relaxation for Full Duplex Overlap
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Solution Overview
Problem
In full duplex (FD) operation mode, channel state information-reference signals (CSI-RS) often collide with uplink subbands, leading to challenges in CSI computation time and CPU occupation, particularly when gNB switches between different spatial or power domains for network energy saving, and existing solutions do not adequately address the impact on processing timelines and resource allocation.
Innovation Solution
The proposed solution involves adjusting processing times and CPU occupation by monitoring conditions such as CSI-RS or PDSCH overlapping with uplink subbands, and implementing algorithms to handle non-contiguous CSI-RS, different spatial or power patterns, and wideband precoding resource groups, thereby relaxing processing requirements and accurately reflecting CPU usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If CSI-RS is configured to span wide frequency band in FD operation, then CSI measurement coverage is improved, but resource collision with UL subband increases and processing complexity increases
Solution Approach 1:
The patent segments the wideband CSI-RS configuration into multiple options: (1) dividing into two contiguous CSI-RS resources linked to one CSI report, (2) using non-contiguous CSI-RS resource allocation, or (3) using contiguous CSI-RS with skipping mechanisms. This segmentation allows the system to maintain wideband measurement coverage while managing processing complexity through structured resource division and selective processing.
2Adaptability or versatility
If contiguous CSI-RS is configured to overlap with UL subband, then resource allocation flexibility is improved, but CSI reporting accuracy deteriorates due to collisions
Solution Approach 1:
The patent applies local quality by enabling selective CSI reporting based on collision detection. When CSI-RS resources collide with UL subbands, the system can skip reporting for specific colliding subbands (Option 3-2) or configure reporting settings to exclude colliding subbands (Option 3-3). This allows accurate CSI reporting in non-colliding regions while maintaining flexible resource allocation overall.
3Use of energy by moving object
If processing requirements are relaxed for non-contiguous CSI-RS, then CPU occupation is reduced, but processing time increases
Solution Approach 1:
The patent implements partial action by allowing the UE to skip processing and reporting for CSI-RS resources that collide with UL subbands. Instead of processing all configured CSI-RS resources, the system selectively processes only the non-colliding portions, thereby reducing CPU occupation and energy consumption while accepting that some CSI measurement opportunities are foregone in colliding regions.
4Productivity
If same CSI-RS port is transmitted in both SBFD and non-SBFD symbols, then resource efficiency is improved, but CSI measurement accuracy deteriorates due to different antenna patterns and power levels
Solution Approach 1:
The patent applies dynamics by making the CSI-RS transmission configuration adaptable to different symbol types. The system can dynamically adjust whether the same CSI-RS port is used in SBFD and non-SBFD symbols based on whether different antenna patterns or power levels are applied. This dynamic approach maintains resource efficiency when patterns are consistent while ensuring measurement accuracy when patterns differ.
Data Source
AI summary
A system and a method are disclosed for a terminal in a wireless communication system. The method includes monitoring for at least one of a first condition or a second condition, wherein the first condition includes a CSI-RS or a PDSCH overlapping with an uplink subband in a subband full-duplex operation and becoming non-contiguous in a frequency domain, and wherein the second condition includes different network antenna patterns or power patterns being used in a network energy saving operation for transmission of the CSI-RS; and relaxing processing requirements related to at least one of a processing timeline or occupied computational resources, in response to the first condition or the second condition occurring.