User Terminal CSI Collision Handling on Uplink Channels
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Solution Overview
Problem
Future radio communication systems face challenges in managing collisions between different types of CSI reports, such as periodic, aperiodic, and semi-persistent CSI reports, which can lead to reduced throughput if not appropriately handled.
Innovation Solution
A method is introduced to control CSI reports by dropping or multiplexing them based on priority and type, using specific priority calculation formulas and multi-CSI-PUCCH resources to manage collisions effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If multiple types of CSI reports (periodic, aperiodic, semi-persistent) are transmitted simultaneously, then the comprehensiveness of channel state information reporting is improved, but resource collisions occur leading to reduced throughput
Solution Approach 1:
The patent segments CSI reports into different types (periodic, aperiodic, semi-persistent) with different priorities, and further segments the handling mechanism into collision detection, priority determination, and selective transmission/dropping. This segmentation allows the system to manage multiple CSI reports systematically without resource collisions
Solution Approach 2:
The patent introduces priority parameters for different CSI report types and changes the transmission parameter based on collision detection. When collisions are detected, the system changes the transmission parameter by selectively dropping lower-priority reports, thereby resolving the contradiction between information completeness and throughput
2Loss of information
If all CSI reports are transmitted without priority-based filtering, then information completeness is maintained, but resource waste increases due to collisions and retransmissions
Solution Approach 1:
The patent performs preliminary collision detection and priority determination before actual CSI report transmission. By proactively identifying potential collisions and determining which reports to drop based on priority, the system avoids wasted transmission resources while ensuring critical CSI information is delivered
Solution Approach 2:
The patent selectively discards lower-priority CSI reports when collisions are detected, based on priority parameters. This discarding mechanism prevents resource waste from transmitting conflicting reports, while the system recovers by ensuring higher-priority CSI reports are transmitted successfully
3Productivity
If priority-based selective dropping of CSI reports is implemented, then resource utilization is optimized, but the complexity of collision management increases
Solution Approach 1:
The patent manages collision management complexity by changing and utilizing priority parameters assigned to different CSI report types. This parameter-based approach provides a systematic and standardized method for collision resolution, making the complex management process more tractable through clear priority rules
4Adaptability or versatility
If semi-persistent CSI reports are introduced in addition to periodic and aperiodic reports, then reporting flexibility is improved, but the likelihood of collisions between different report types increases
Solution Approach 1:
The patent segments CSI reports into three distinct types (periodic, aperiodic, semi-persistent) with different characteristics and priorities. This segmentation allows the system to maintain reporting flexibility through diverse report types while managing collision risk through priority-based differentiation
Solution Approach 2:
The patent assigns different priority parameters to different CSI report types, particularly giving semi-persistent reports appropriate priority levels. This parameter differentiation enables the system to maintain reliability during collisions by systematically determining which reports to transmit and which to drop
Data Source
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AI summary
To appropriately control a plurality of CSI reports of different types, a user terminal according to one aspect of the present disclosure includes: a transmitting section that transmits channel state information (CSI) reports of different types; and a control section that, when transmission durations of a plurality of the CSI reports overlap, drops a given CSI report according to priority or multiplexes a given CSI report on a given uplink channel, based on a type of each of the plurality of the CSI reports and a type of an uplink channel used for transmission of each of the plurality of the CSI reports.