CSI Feedback Packet Mapping for Flexible Uplink Control Resources
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently utilizing flexible uplink control resources for channel state information (CSI) feedback due to timing and sizing restrictions, which affect the scheduling and transmission of CSI feedback.
Innovation Solution
The system employs techniques such as single-slot CSI reporting with encoded packets of predetermined sizes, multi-slot CSI reporting with triggered transmissions, and flexible resource allocation to optimize CSI feedback transmission, including encoding and mapping CSI components across multiple slots or resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CSI feedback is transmitted using flexible uplink control resources with varying durations and frequency bandwidths, then resource utilization efficiency is improved, but timing and sizing restrictions are introduced that complicate scheduling and transmission
Solution Approach 1:
The patent implements dynamic CSI feedback transmission by allowing the UE to adaptively select transmission parameters (single-slot vs. multi-slot, number of encoded packets) based on the allocated uplink control resource characteristics. The system dynamically adjusts the CSI reporting strategy to match the flexible resource allocation, resolving the contradiction between resource utilization efficiency and scheduling complexity.
Solution Approach 2:
The patent changes key parameters of CSI feedback transmission including the time slot configuration (single or multiple slots), the number of encoded packets, and the resource allocation strategy. By varying these parameters based on the uplink control resource characteristics, the system achieves efficient resource utilization while maintaining manageable scheduling complexity.
2Loss of substance
If all CSI feedback components are encoded into a single encoded packet, then transmission overhead is reduced, but the packet size may exceed uplink control resource capacity
Solution Approach 1:
The patent segments the CSI feedback components into multiple encoded packets when the total feedback data exceeds the capacity of a single uplink control resource. The UE divides the CSI components (such as wideband CSI and narrowband CSI) into separate encoded packets, each fitting within the allocated resource constraints, thereby reducing transmission overhead while maintaining resource capacity adaptability.
Solution Approach 2:
The system dynamically determines the number of encoded packets based on the capacity of the allocated uplink control resources. When resources are abundant, all CSI components can be transmitted in fewer packets; when resources are limited, the system increases the number of packets to match the resource capacity, achieving both overhead reduction and adaptability.
3Loss of time
If CSI feedback components are transmitted in a single slot, then transmission time is reduced, but the uplink control resource allocation becomes more restrictive
Solution Approach 1:
The patent implements dynamic slot selection for CSI feedback transmission. The UE can transmit all CSI components in a single slot when uplink control resources are readily available, reducing transmission time. Conversely, when resource allocation is restrictive, the system adapts by spreading transmission across multiple slots, thereby maintaining resource allocation flexibility while managing transmission time efficiently.
Solution Approach 2:
The system changes the time slot configuration parameter based on uplink control resource availability. By allowing CSI feedback to be transmitted in either single-slot or multi-slot configurations, the system reduces transmission time when possible while maintaining flexibility to adapt to restrictive resource allocation scenarios.
4Productivity
If narrowband CSI feedback is reported for a limited number of subbands, then single-slot transmission is enabled, but the CSI feedback precision is reduced
Solution Approach 1:
The patent segments CSI feedback into wideband CSI components and narrowband CSI components, which can be transmitted in different encoded packets across one or multiple slots. This segmentation allows the system to maintain high transmission efficiency by prioritizing wideband CSI while optionally including narrowband CSI for enhanced precision when resources permit, thus balancing transmission efficiency and CSI feedback precision.
Solution Approach 2:
The system dynamically adjusts the number of subbands for narrowband CSI feedback based on available uplink control resources. When resources are abundant, more subbands are included to improve CSI precision; when resources are limited, the system reduces the number of subbands to maintain single-slot transmission efficiency, achieving an optimal balance between the two objectives.
Data Source
AI summary
Methods, systems, and devices are described for wireless communications that support transmitting channel state information (CSI) feedback utilizing flexible uplink control resources. A method may include determining a size of a frequency subband corresponding to components of a CSI feedback report based on configuration signaling or a size of allocated uplink control resources. A method may include encoding a CSI report into a single packet and transmitting the single packet over uplink control resources. A method may include encoding a first plurality of components of a CSI report in a first packet, encoding a second plurality of components of the CSI report in a second packet, and mapping the packets to uplink control resources. A method may include transmitting a first plurality of components of a CSI report on a first slot and a second plurality of components of the CSI report on one or more subsequent slots.