PUCCH Cell Switching for Accurate CSI Reporting
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing channel state information (CSI) reporting, particularly when wireless devices are configured with physical uplink control channel (PUCCH) cell switching, which can lead to suboptimal performance and resource utilization.
Innovation Solution
Enhancements in CSI reporting mechanisms are introduced to improve efficiency when PUCCH cell switching is employed, optimizing channel state information reporting to enhance system performance and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PUCCH cell switching is configured to enable flexible resource allocation, then resource utilization improves, but CSI reporting accuracy deteriorates due to suboptimal reporting performance
Solution Approach 1:
The patent implements dynamic PUCCH cell switching where the wireless device can switch between different serving cells for PUCCH transmission based on downlink data reception. This dynamic behavior allows the system to adapt resource allocation to varying channel conditions while maintaining accurate CSI reporting by ensuring CSI is reported on the appropriate serving cell where the PDSCH was actually received
Solution Approach 2:
The patent changes the parameter of PUCCH serving cell selection dynamically based on downlink assignment indicators. When a downlink PDSCH is received on a non-PUCCH serving cell, the device switches to use that cell for PUCCH transmission, and accordingly reports CSI on that same cell. This parameter change ensures CSI accuracy while enabling flexible resource utilization across multiple serving cells
2Measurement precision
If CSI reporting is performed on non-PUCCH serving cells to improve accuracy, then measurement precision improves, but device complexity increases due to additional configuration requirements
Solution Approach 1:
The patent makes serving cells universal by enabling any configured serving cell to function as a PUCCH transmitting cell under appropriate conditions. Instead of designating fixed PUCCH cells, any serving cell can handle PUCCH transmission when downlink data is received on that cell, simplifying the configuration by removing the need for special PUCCH cell designations while maintaining reporting accuracy
3Device complexity
If PUCCH transmission is restricted to designated serving cells only, then device complexity is reduced, but resource utilization deteriorates due to limited flexibility
Solution Approach 1:
The patent introduces dynamic PUCCH cell selection where the set of PUCCH transmitting cells is not fixed but changes based on downlink reception patterns. This dynamic approach increases resource utilization by allowing flexible use of all configured serving cells for PUCCH transmission while keeping configuration relatively simple through standard RRC signaling that indicates which cells should transmit PUCCH under specific conditions
Data Source
AI summary
A base station may transmit CSI report configuration parameters for CSI reports via a first cell. The base station may further transmit a time pattern configuration parameter indicating first timings that the first cell is a PUCCH cell and second timings that a second cell is the PUCCH cell. The base station may receive a CSI report, scheduled for transmission in a report timing via the first cell, based on the report timing being within the first timings and based on the report timing not being within the second timings.