CSI Report Prioritization in Carrier Aggregation

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Solution Overview

Problem

In wireless communication systems, particularly with carrier aggregation in LTE-Advanced, there is a challenge in efficiently prioritizing multiple channel state information (CSI) reports to be transmitted in the same subframe, leading to collisions and potential dropping of reports due to the limited capacity of the physical uplink control channel (PUCCH).

Innovation Solution

A method is introduced to prioritize CSI reports based on feedback reporting modes, types, number of antenna ports, and priority numbers, allowing the user equipment (UE) to select and transmit the highest priority report using predefined rules and dynamic prioritization schemes, ensuring optimal resource allocation and minimizing report collisions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If multiple CSI reports are transmitted in the same subframe, then the amount of uplink control information increases, but the physical uplink control channel capacity is exceeded causing report collisions and drops

Engineering Contradiction:
Improveamount of uplink control informationVSAvoidreport transmission reliability
Core Design Contradiction:
Quantity of substanceVSReliability

Solution Approach 1:

The patent segments multiple CSI reports by assigning different priority levels (first priority, second priority, etc.) based on feedback reporting modes and types. This segmentation allows the system to handle multiple reports systematically by processing them in priority order, preventing channel capacity overflow while ensuring critical reports are transmitted reliably.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent changes the parameter of CSI report prioritization by introducing a hierarchical structure based on feedback reporting modes (first mode vs. second mode) and types (first type vs. second type). This parameter-based prioritization system transforms the uniform treatment of CSI reports into a differentiated approach, allowing the physical uplink control channel to accommodate multiple reports by selectively transmitting high-priority ones when capacity is limited.

Inventive Principle:
Principle #35Parameter changes

2Productivity

If carrier aggregation is implemented, then system capacity and coverage are improved, but the complexity of managing multiple CSI reports increases

Engineering Contradiction:
Improvesystem capacityVSAvoidCSI report management complexity
Core Design Contradiction:
ProductivityVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing CSI reports into distinct priority categories based on their feedback reporting mode and type. This segmentation simplifies the management of multiple CSI reports in carrier aggregation scenarios by providing a clear hierarchical structure, where the wireless communication device can systematically select and transmit reports according to their priority levels rather than managing them as a undifferentiated group.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent introduces parameter-based differentiation by assigning priority levels to CSI reports based on their feedback reporting mode (first or second mode) and type (first or second type). This parameter change transforms the complex management of multiple CSI reports across multiple component carriers into a structured process, where reports are automatically prioritized according to predefined rules, reducing management complexity despite increased system capacity.

Inventive Principle:
Principle #35Parameter changes

3Ease of operation

If all CSI reports are transmitted with equal priority, then simplicity is maintained, but critical information may be lost due to random dropping

Engineering Contradiction:
Improveoperational simplicityVSAvoidCSI report information loss
Core Design Contradiction:
Ease of operationVSLoss of information

Solution Approach 1:

The patent changes the priority parameter of CSI reports from uniform to differentiated based on feedback reporting mode and type. This parameter change ensures that critical information is preserved by assigning higher priority to certain report types, preventing random dropping. The system maintains operational simplicity through automated priority-based selection rules, eliminating the need for complex manual prioritization while ensuring important CSI information is transmitted reliably.

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentUS9143973B2Prioritizing multiple channel state information (CSI) reporting with carrier aggregation
Publication Date: 2015.09.22 SHARP KK
  • US9143973B2 patent drawing
  • US9143973B2 patent drawing
  • US9143973B2 patent drawing

AI summary

A method for reporting uplink control information (UCI) on a user equipment (UE) is described. Multiple channel state information (CSI) reports are generated for multiple component carriers (CCs) that are scheduled to be transmitted in a subframe. A method of prioritization for the CSI reports is selected. A highest priority CSI report of the multiple CSI reports is determined using the selected method of prioritization. The highest priority CSI report is transmitted.