HARQ-ACK Codebook Segmentation for Multi-TRP Reliability
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Solution Overview
Problem
Current mobile communication networks face challenges in efficiently managing and optimizing communication protocols across multiple technologies and releases, particularly in 5G networks, leading to suboptimal performance and resource utilization due to outdated base station configurations and lack of adaptive bandwidth management.
Innovation Solution
The implementation of advanced protocol stacks and adaptive bandwidth management techniques, such as bandwidth parts (BWPs) and carrier aggregation, within the New Radio (NR) framework, allows for dynamic configuration of wireless devices and base stations to optimize data transmission and resource allocation based on traffic load and device capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transmission and reception points are used for MIMO operations, then data transmission reliability and throughput are improved, but codebook configuration complexity and resource overhead increase
Solution Approach 1:
The codebook is segmented into multiple codebook groups, each associated with specific TRPs. This allows the UE to report CSI for each group separately, reducing the overall complexity by dividing the large codebook into manageable segments that can be handled independently for each transmission point.
Solution Approach 2:
The patent implements dynamic codebook configuration where the codebook size and structure adapt based on the number of active TRPs and antenna ports. The codebook is dynamically selected from multiple configurations based on current channel conditions and TRP activity, optimizing the balance between reliability and complexity in real-time.
2Productivity
If codebook size is increased to support more antenna ports and TRPs, then MIMO performance is improved, but uplink signaling overhead and processing burden increase
Solution Approach 1:
CSI reporting is segmented by codebook group, allowing the UE to report only the necessary CRI, PMI, and CQI for each active TRP group rather than reporting a single comprehensive codebook. This segmentation reduces uplink signaling overhead while maintaining the ability to support multiple antenna ports and TRPs.
Solution Approach 2:
The patent implements partial codebook reporting where the UE reports CSI parameters only for the selected codebook group and active TRPs rather than all possible configurations. This partial action approach provides sufficient MIMO performance for current needs without the excessive overhead of reporting all possible codebook options.
3Productivity
If dynamic bandwidth allocation is implemented to adapt to traffic load, then resource utilization efficiency is improved, but base station configuration complexity and processing requirements increase
Solution Approach 1:
The base station implements dynamic bandwidth part (BWP) configuration where bandwidth allocation adapts to current traffic load and channel conditions. The gNB can dynamically activate or deactivate specific BWPs and adjust their parameters based on real-time network state, improving resource utilization while maintaining manageable complexity through standardized procedures.
Solution Approach 2:
The patent utilizes parameter changes in BWP configuration to adapt to varying traffic conditions. By modifying bandwidth parameters, subcarrier spacing, and cyclic prefix lengths of active BWPs based on traffic load, the system achieves efficient resource utilization without requiring complete reconfiguration of the base station architecture.
Data Source
AI summary
A wireless device may receive, via a first control resource set (coreset), of a cell, associated with a first physical cell index (PCI), a first downlink control information (DCI) comprising a first downlink assignment index (DAI) field with a first value. The wireless device may receive, via a second coreset, of the cell, associated with a second PCI, a second DCI comprising a second DAI field with a second value. The first value and the second value may be in an ascending order of the first PCI and the second PCI. The wireless device may transmit a hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook comprising a first acknowledgement information associated with the first DCI and a second acknowledgement information associated with the second DCI.