PUCCH Resource Allocation for Colliding CSI Reports
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Solution Overview
Problem
The existing resource allocation schemes for transmitting multiple periodic channel state information reports on the physical uplink control channel (PUCCH) in wireless telecommunication systems, particularly in LTE-A, face challenges such as increased resource consumption with carrier aggregation and CoMP feedback, leading to inefficiencies in utilizing the PUCCH capacity.
Innovation Solution
A method and apparatus for determining colliding reports on an uplink resource and applying a resource selection policy to select the appropriate resource for transmitting multiple reports, including channel state information and hybrid automatic repeat request acknowledgments, while maintaining single carrier properties, by using standardized policies like selecting resources based on index or payload capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If per-cell reporting/configuration is used for carrier aggregation, then configuration modularity is improved, but physical uplink control channel resource consumption increases linearly with the number of cells
Solution Approach 1:
The patent combines multiple channel state information reports that collide in the same subframe into a single PUCCH transmission. By merging multiple reports (e.g., CQI, PMI, RI for different cells) into one unified transmission using Format 3 or Format 5, the system maintains per-cell reporting configuration while reducing the number of separate PUCCH resources needed, thus resolving the linear resource consumption growth.
Solution Approach 2:
The patent creates a universal resource selection policy that handles multiple types of channel state information reports (CQI, PMI, RI, PTI) and multiple cell configurations through a single standardized mechanism. This universal approach allows the same resource selection rules to apply regardless of the number of cells or report types, preventing resource consumption from scaling linearly with system complexity.
2Loss of information
If multiple periodic channel state information reports are transmitted in the same subframe, then reporting completeness is improved, but resource collision and PUCCH capacity utilization efficiency deteriorate
Solution Approach 1:
The patent resolves resource collisions by introducing a new dimension for resource selection based on report type and timing characteristics. Instead of treating all reports equally in time domain, the system differentiates between report types (CQI, PMI, RI, PTI) and applies specific resource selection policies, effectively adding a classification dimension that prevents collisions while maintaining complete reporting.
Solution Approach 2:
The patent implements dynamic resource selection where the PUCCH format and resource are chosen based on the specific combination of reports that need to be transmitted in each subframe. The system dynamically adapts between Format 3, Format 5, and other formats depending on the number and type of colliding reports, optimizing PUCCH capacity utilization for each transmission instance rather than using a static allocation.
3Adaptability or versatility
If carrier aggregation and CoMP feedback are combined, then system functionality is improved, but physical uplink control channel resource consumption increases considerably
Solution Approach 1:
The patent segments the channel state information reporting into different priority levels and types (CQI, PMI, RI, PTI for different cells and CoMP configurations). By segmenting reports according to their importance and characteristics, the system can apply different resource selection policies to different segments, ensuring critical reports are transmitted while reducing overall resource consumption through selective multiplexing.
Solution Approach 2:
The patent implements a nested structure where multiple channel state information reports are embedded within a single PUCCH transmission container. The reports from different cells and CoMP configurations are nested hierarchically, with higher-priority reports (like RI) potentially taking precedence over lower-priority ones (like CQI) when resources are constrained, allowing comprehensive reporting within limited PUCCH resources.
Data Source
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AI summary
Disclosed are a method and a corresponding apparatus relating to wireless telecommunication systems and more particularly to efficient resource allocation schemes supporting transmission of multiple periodic channel state information (CSI) reports on the physical uplink control channel (PUCCH) during the same subframe while maintaining single carrier properties of the transmitted signal. The method includes determining that at least two reports to be transmitted on an uplink resource collide with respect to the uplink resource, applying at least one resource selection policy to the at least two reports and selecting a resource to be used for transmitting a plurality of the at least two reports.