CSI Multiplexing in PUSCH Repetitions Across Spatial Filters
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently multiplexing channel state information (CSI) reports in uplink channel repetitions, particularly in 4G and 5G networks, which can lead to inefficiencies in resource allocation and data transmission.
Innovation Solution
A method for a wireless device to transmit CSI reports on the earliest repetitions of physical uplink shared channel (PUSCH) transmissions using different spatial domain transmission filters, allowing for efficient multiplexing of CSI reports across multiple repetitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSI reports are transmitted on all PUSCH repetitions, then reliability of CSI delivery is improved, but resource overhead and transmission complexity increase
Solution Approach 1:
The patent segments the PUSCH repetitions into two groups: first repetitions (without CSI) and second repetitions (with CSI). This segmentation allows the system to avoid transmitting CSI on all repetitions while ensuring reliable delivery through selective repetition, thereby reducing resource overhead while maintaining reliability.
Solution Approach 2:
The patent applies preliminary action by transmitting the transport block on first repetitions without CSI reports, establishing a baseline transmission before adding CSI on subsequent repetitions. This prepares the receiver to correctly interpret and combine CSI information from selected repetitions without processing overhead from all repetitions.
2Productivity
If CSI reports are multiplexed on multiple PUSCH repetitions, then data transmission performance is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent divides repetitions into categories (first and second repetitions) with different CSI multiplexing rules. This segmentation simplifies device processing by providing clear criteria for selecting which repetitions carry CSI, reducing the complexity of determining CSI transmission opportunities while maintaining improved data transmission performance through selective multiplexing.
3Productivity
If spatial domain transmission filters are applied to different repetitions, then spectral efficiency is improved, but signal processing complexity increases
Solution Approach 1:
The patent applies local quality by assigning different spatial domain transmission filters to different repetition groups (first vs. second repetitions). This allows the system to optimize signal quality for CSI-bearing repetitions using appropriate filters while keeping the overall processing complexity manageable through the structured approach of applying filters based on repetition type rather than individually to each repetition.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A wireless device may receive downlink control information (DCI) scheduling transmission of a channel state information (CSI) report, one or more first repetitions of a physical uplink shared channel (PUSCH) transmission with a first spatial domain transmission filter, and one or more second repetitions of the PUSCH transmission with a second spatial domain transmission filter. The wireless device may multiplex the CSI report on an earliest repetition of the one or more first repetitions corresponding to the first spatial domain transmission filter and an earliest repetition of the one or more second repetitions corresponding to the second spatial domain transmission filter. The wireless device may, based on the multiplexing of the CSI report, transmit the one or more first repetitions and the one or more second repetitions.