CSI Report Collision Handling in Carrier Aggregation
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in transmitting control information, particularly in carrier aggregated situations, where periodic and aperiodic Channel State Information (CSI) reports often collide, leading to dropped reports and inefficient resource utilization.
Innovation Solution
A method and apparatus that prioritize and manage CSI reports by dropping or piggybacking periodic reports onto aperiodic reports based on priority and cell configuration, ensuring efficient transmission of control information on uplink shared channels, especially in carrier aggregated scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If periodic CSI reports are transmitted for multiple cells, then channel state information coverage is improved, but report collision and resource conflict increase
Solution Approach 1:
The patent segments the handling of periodic CSI reports by cell priority. High-priority cells maintain their periodic reporting, while low-priority cells have their reports piggybacked on aperiodic reports or dropped during collisions. This segmentation allows the system to preserve essential CSI information while reducing overall collision frequency and improving resource utilization.
Solution Approach 2:
The patent implements nesting by piggybacking low-priority periodic CSI reports onto aperiodic CSI report channels. Instead of transmitting separate periodic reports that would collide, the periodic report content is embedded within the aperiodic report structure, allowing multiple layers of information to be transmitted through a single channel resource.
2Measurement precision
If aperiodic CSI reports are prioritized during collision, then reporting accuracy for specific cells is improved, but periodic reporting for other cells is dropped
Solution Approach 1:
The patent applies local quality by differentiating treatment based on cell priority. High-priority cells receive guaranteed periodic reporting resources, while low-priority cells accept piggybacking or dropping. This localized quality adjustment ensures that critical CSI information is preserved with high accuracy while non-critical information is managed efficiently during resource conflicts.
Solution Approach 2:
The patent changes the transmission parameter state of periodic CSI reports dynamically. When collision detection occurs, the transmission mode parameter changes from independent periodic transmission to piggybacking on aperiodic reports or dropping, based on priority configuration. This parameter change allows flexible adaptation to resource availability while maintaining measurement precision for high-priority cells.
3Reliability
If multiple periodic CSI reports are transmitted simultaneously, then comprehensive channel monitoring is improved, but collision probability increases
Solution Approach 1:
The patent introduces dynamics by making the periodic CSI report transmission behavior adaptive rather than static. The system dynamically adjusts between three states (normal periodic transmission, piggybacking on aperiodic reports, and dropping) based on real-time collision detection and priority configuration. This dynamic adjustment maintains reliable channel monitoring while minimizing collision time losses.
Solution Approach 2:
The patent implements feedback mechanisms where the system monitors for collisions between periodic and aperiodic reports. When collisions are detected, the feedback triggers a change in transmission behavior for subsequent reports, adjusting the timing and channel selection based on the collision outcome and priority levels to prevent future conflicts.
Data Source
AI summary
Channel state information (CSI) reporting is described. CSI configuration information for a plurality of cells, and information requesting an aperiodic CSI report for a first cell are received. A periodic CSI report for a second cell different from the first cell with the aperiodic CSI report for the first cell in a corresponding subframe is transmitted. If a physical uplink control channel (PUCCH) and a physical uplink shared channel (PUSCH) are transmitted in the corresponding subframe simultaneously, the periodic CSI report for the second cell is transmitted via the PUCCH and the aperiodic CSI report for the first cell is transmitted via the PUSCH in the corresponding subframe. Otherwise, the periodic CSI report for the second cell is piggybacked on the PUSCH and the periodic CSI report for the second cell and the aperiodic CSI report for the first cell are transmitted via the PUSCH in the corresponding subframe.