HARQ-ACK Codebook Configuration for Multi-TRP PUCCH Transmission
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Solution Overview
Problem
Current 5G communication systems face challenges in managing spatial settings and transmitting physical uplink control channels (PUCCHs) effectively to multiple transmission-reception points (TRPs), which affects data rates and reliability.
Innovation Solution
A user equipment (UE) and base station configuration that includes a transceiver and processor to determine and transmit hybrid automatic repeat request acknowledgement (HARQ-ACK) information bits, using distinct HARQ-ACK codebooks for different CORESETs, enabling efficient PUCCH transmission with multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-TRP communication is implemented to enhance data rates and reliability, then communication performance is improved, but spatial settings management and PUCCH transmission complexity increase
Solution Approach 1:
The patent segments the spatial settings configuration by introducing a group index that divides CORESETs into multiple groups (first group and second group). Each group is associated with specific spatial settings, allowing the system to manage multiple TRPs by dividing the configuration space into manageable segments rather than handling all spatial settings simultaneously.
Solution Approach 2:
The patent adds a new dimension to the configuration space by introducing the group index parameter. This dimension allows the system to distinguish between different sets of spatial settings associated with different TRPs, transforming the management of spatial settings from a flat structure to a hierarchical structure with an additional grouping layer.
2Reliability
If multiple PUCCHs are transmitted to different TRPs, then communication reliability is improved, but transmission complexity and resource management difficulty increase
Solution Approach 1:
The patent applies local quality by associating specific spatial settings with specific groups of CORESETs. Each group (first group or second group) has its own dedicated spatial settings, allowing the UE to transmit PUCCHs with appropriate spatial characteristics tailored to each TRP's requirements, rather than using a uniform approach for all TRPs.
Solution Approach 2:
The patent segments the PUCCH transmission management by dividing CORESETs into groups and associating each group with specific spatial settings. This segmentation allows the system to handle multiple PUCCH transmissions to different TRPs by processing each group separately with its own spatial configuration, reducing the overall management complexity.
3Productivity
If HARQ-ACK information is transmitted with multiple spatial settings, then multi-TRP communication effectiveness is improved, but determination and transmission complexity increase
Solution Approach 1:
The patent applies preliminary action by configuring the group index and associated spatial settings in advance through RRC signaling. This pre-configuration allows the UE to efficiently determine which spatial settings to use for HARQ-ACK transmission based on the group index of the received PDCCH, without needing to make complex decisions at the moment of transmission.
Solution Approach 2:
The patent introduces dynamics by allowing the spatial settings for HARQ-ACK transmission to vary based on the group index. The system dynamically selects the appropriate spatial settings (first spatial settings for first group, second spatial settings for second group) based on which group's PDCCH scheduled the PDSCH, enabling flexible adaptation to different TRP configurations.
Data Source
AI summary
Methods and apparatuses for transmitting and receiving HARQ-ACK information. A method of operating a UE includes receiving: a configuration for a first group index for first control resource sets (CORESETs), physical downlink control channels (PDCCHs) in CORESETs, wherein the PDCCHs provide respective downlink control information (DCI) formats scheduling respective receptions of physical downlink shared channels (PDSCHs), and the PDSCHs corresponding to the PDCCHs. The method further includes determining HARQ-ACK information bits in response to a PDSCH reception. When a PDCCH reception is in a CORESET from the first CORESETs, the HARQ-ACK information bits are in a first HARQ-ACK codebook. When the PDCCH reception is not in a CORESET from the first CORESETs, the HARQ-ACK information bits are in a second HARQ-ACK codebook. The method further includes transmitting a first physical uplink control channel (PUCCH) with the first HARQ-ACK codebook and a second PUCCH with the second HARQ-ACK codebook.