CSI Reporting for Multi-Configuration Carrier Aggregation
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Solution Overview
Problem
Current wireless communication networks face challenges in efficiently managing channel state information (CSI) reporting for multiple component carriers (CCs) with different system configurations, such as FDD and TDD, which complicates the determination of available subframes for CSI transmission, leading to potential CSI dropping or delays.
Innovation Solution
The techniques involve configuring UE to periodically report CSI for multiple CCs with different system configurations by arranging CCs into groups with the same configuration, selecting a designated CC for CSI transmission based on available subframes, or using specific periodicity and offset settings, allowing CSI to be sent on a CC with the highest priority or a primary CC, thereby ensuring CSI reporting flexibility and reducing the likelihood of CSI being dropped.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple CCs with different system configurations are supported, then carrier aggregation flexibility is improved, but CSI reporting complexity increases due to different available subframe sets
Solution Approach 1:
The patent segments CCs into different groups based on their system configurations (FDD, TDD, or TDD with different uplink-downlink configurations). Each group shares common CSI reporting characteristics, allowing the UE to determine available subframes for CSI reporting based on the group rather than processing each CC individually. This segmentation reduces complexity while maintaining support for multiple configurations.
Solution Approach 2:
The patent establishes a universal approach where the available subframes for CSI reporting on a given CC are determined based on the system configuration of another CC (the 'reference CC'). This multi-functionality allows a single determination mechanism to apply across different CC configurations, simplifying the CSI reporting process while supporting carrier aggregation with diverse system configurations.
2Reliability
If periodic CSI reporting is configured for multiple CCs, then CSI reporting completeness is improved, but risk of CSI dropping increases due to subframe availability conflicts
Solution Approach 1:
The patent performs preliminary determination of available subframes for CSI reporting based on the system configuration of a reference CC before actual CSI transmission occurs. By pre-calculating which subframes are available for CSI reporting on each CC, the UE can proactively schedule CSI reports in advance, avoiding conflicts and dropping issues that would arise from attempting to report CSI simultaneously on multiple CCs with different configurations.
3Ease of operation
If CSI for multiple CCs is reported on a single designated CC, then uplink control information transmission is simplified, but subframe utilization efficiency decreases
Solution Approach 1:
The patent applies local quality by allowing different CCs to have different available subframe sets based on their individual system configurations. Rather than forcing all CCs to share a single uniform subframe schedule, each CC can utilize its locally optimal subframes for CSI reporting. This enables more efficient subframe utilization across the aggregate of multiple CCs while maintaining manageable complexity through group-based determination.
Data Source
AI summary
Techniques to support periodic reporting of channel state information (CSI) for multiple component carriers (CCs) with different system configurations are disclosed. A user equipment (UE) is configured with multiple CCs for carrier aggregation. Each CC is associated with a particular system configuration, which indicates whether FDD or TDD is utilized and, if TDD is utilized, a particular uplink-downlink configuration for the CC. Each CC is associated with a set of subframes available to send CSI on that CC, which is determined based on the system configuration of the CC. The multiple CCs configured for the UE include at least two CCs associated with different system configurations and different sets of subframes available to send CSI. The UE sends CSI for a first CC on a second CC based on a set of subframes available to send CSI on the second CC.