PUCCH Reporting Mode Selection for Multi-TRP HARQ Feedback
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Solution Overview
Problem
Existing multi-TRP/panel cooperative transmission in 5G systems lacks clear solutions for determining the reporting mode of physical uplink control channel (PUCCH) reporting, particularly in switching between joint and independent reporting, and determining the order of acknowledgement/negative acknowledgement (AN) information during joint reporting.
Innovation Solution
A method and apparatus that determine the PUCCH reporting mode based on time domain resources and higher-layer configuration, allowing for joint or independent reporting of HARQ feedback information, with specific mechanisms to handle different scenarios and configurations, including cascading or interleaving codebooks and using higher-layer identifiers to establish the order of AN information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple DCI schedule multiple PDSCHs in multi-TRP cooperative transmission, then network coverage and service balance are improved, but the PUCCH reporting mode becomes ambiguous and complex
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the PUCCH reporting mode based on the number of scheduled PDSCHs. When one or two PDSCHs are scheduled, joint reporting mode is used; when more than two PDSCHs are scheduled, independent reporting mode is used. This parameter-based adaptation resolves the ambiguity while maintaining system reliability.
Solution Approach 2:
The patent implements dynamics by making the PUCCH reporting mode flexible and adaptive rather than fixed. The reporting mode changes dynamically based on the scheduling scenario (number of PDSCHs), allowing the system to optimize between joint and independent reporting approaches according to real-time conditions.
2Loss of energy
If joint reporting mode is used for multiple PDSCHs, then signaling overhead is reduced, but the processing time for HARQ-ACK generation may be insufficient
Solution Approach 1:
The patent changes the reporting mode parameter based on processing time requirements. When the number of PDSCHs exceeds two, the system switches to independent reporting mode, which allows separate HARQ-ACK processing for each PDSCH, thereby ensuring sufficient processing time while managing signaling overhead appropriately.
Solution Approach 2:
The patent applies segmentation by dividing the HARQ-ACK reporting into separate independent reports for each PDSCH when the number of PDSCHs is large. This segmentation allows each HARQ-ACK to be processed independently with adequate time, rather than attempting to process multiple HARQ-ACKs jointly within insufficient time.
3Loss of time
If independent reporting mode is used for each PDSCH, then processing time requirements are met, but resource ambiguity increases
Solution Approach 1:
The patent uses parameter changes to determine when to switch from joint to independent reporting mode based on the number of PDSCHs. This threshold-based parameter adjustment ensures that independent reporting (which reduces processing time pressure) is only used when necessary, thereby minimizing resource ambiguity while meeting processing time requirements.
Data Source
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AI summary
The present application discloses an information transmission method and device, which are used to determine the PUCCH reporting method is joint reporting or independent reporting according to time domain resources and high-level configuration, and to use the determined reporting method to transmit PUCCH. On the terminal side, an information transmission method provided by the embodiment of the present application, includes: determining the actual reporting method of the physical uplink control channel PUCCH according to the reported time domain resources and high-level configuration, the actual reporting method is joint reporting or independent reporting; wherein, the high-level configuration includes indication information of the PUCCH reporting method configured on the network side; using the reporting method to transmit PUCCH, the PUCCH carries HARQ feedback information.