CSI Reporting for Multiple Power Offsets in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in dynamically adjusting downlink transmission power for user equipment (UEs) without affecting CSI-RS, as simultaneous power changes impact UEs at the cell edge, leading to inaccurate CSI feedback due to power offset modifications between PDSCH and CSI-RS.
Innovation Solution
User equipment (UEs) generate and report CSI measurements for multiple power offsets, allowing the gNB to dynamically adjust PDSCH and CSI-RS powers independently, ensuring accurate CSI feedback and efficient power management without affecting cell discovery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If PDSCH transmission power is dynamically reduced for cell center UEs to save energy, then power consumption is reduced, but CSI feedback accuracy deteriorates due to power offset changes between PDSCH and CSI-RS
Solution Approach 1:
The patent segments the power control into independent components: PDSCH power offset and CSI-RS power offset. By configuring separate powerOffsetPDSCH and powerOffsetCSI-RS parameters, the system allows dynamic adjustment of PDSCH power without necessarily changing CSI-RS power, thereby maintaining CSI feedback accuracy while enabling energy savings for cell center UEs.
Solution Approach 2:
The patent introduces multiple power offset parameters (powerOffsetPDSCH, powerOffsetCSI-RS, and their delta versions) that can be independently adjusted. These parameter changes enable fine-grained control over power relationships, allowing the system to optimize power consumption while preserving measurement accuracy by selectively modifying only the necessary parameters.
2Use of energy by moving object
If PDSCH power is dynamically changed to adapt to UE channel quality, then energy efficiency is improved, but UEs at cell edge experience degraded SINR performance
Solution Approach 1:
The patent applies local quality by enabling different power offset configurations for different UE groups or scenarios. Cell center UEs can benefit from reduced PDSCH power offsets for energy savings, while cell edge UEs can be configured with appropriate power offsets to maintain their SINR requirements. This localized optimization allows energy efficiency improvements without compromising cell edge performance.
3Stability of the object's composition
If CSI-RS power is changed to maintain power offset with PDSCH, then power offset consistency is maintained, but cell discovery performance deteriorates due to reduced SSB and CSI-RS power
Solution Approach 1:
The patent segments the power control functions by introducing independent parameters for PDSCH power offset and CSI-RS power offset. This segmentation breaks the mandatory coupling between PDSCH and CSI-RS power changes, allowing CSI-RS power to be maintained at levels suitable for cell discovery while PDSCH power is dynamically adjusted for energy efficiency.
Solution Approach 2:
The patent uses power offset parameters as intermediaries to manage power relationships. By configuring powerOffsetPDSCH and powerOffsetCSI-RS separately, these parameters act as intermediaries that decouple the power control of PDSCH and CSI-RS, enabling independent optimization of each signal's power level based on different requirements.
Data Source
AI summary
A system and a method are provided for enhanced channel state information (CSI) reporting. A user equipment (UE) generates CSI based on each of a plurality of power offsets. The UE transmits the CSI measurements in a CSI report to a base station (gNB). The UE receives, from the gNB, an indication of a channel state corresponding to a power offset of the plurality of offsets. Based on the indication of the channel state, the UE uses one or more particular resources to receive a physical downlink shared channel (PDSCH).