PUCCH Power Using Last PDSCH for Stable HARQ-ACK Feedback
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Solution Overview
Problem
The challenge in wireless communication systems is to efficiently manage uplink transmission and reception, particularly in determining the transmission power of a Physical Uplink Control Channel (PUCCH) with Hybrid Automatic Repeat Request-Acknowledgment (HARQ-ACK) information when time domain bundling is configured, to ensure stable HARQ-ACK feedback.
Innovation Solution
A method and apparatus for transmitting and receiving PUCCH in a wireless communication system, where the transmission power for PUCCH is determined based on a specific Physical Downlink Shared Channel (PDSCH) associated with the last Start and Length Indicator Value (SLIV) within the Time Domain Resource Allocation (TDRA) row indicated by Downlink Control Information (DCI).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power for PUCCH is determined based on multiple PDSCHs in time domain bundling, then HARQ-ACK feedback coverage is improved, but transmission power determination complexity increases
Solution Approach 1:
The patent extracts the power determination reference from multiple PDSCHs and focuses on a specific representative PDSCH (the last PDSCH in time domain bundling). This reduces the complexity of evaluating multiple PDSCHs while maintaining the reliability of HARQ-ACK feedback by using the last PDSCH's characteristics as the reference for power determination.
Solution Approach 2:
The patent establishes a predetermined rule that the last PDSCH in time domain bundling serves as the reference for power determination. This preliminary assignment of reference status simplifies the power determination process by eliminating the need for complex real-time evaluation of multiple PDSCHs.
2Reliability
If transmission power is increased for PUCCH with HARQ-ACK information, then feedback reliability is improved, but uplink energy consumption increases
Solution Approach 1:
The patent changes the reference parameter for power determination from multiple PDSCHs to a specific single PDSCH (the last one in time domain bundling). This parameter change allows for more efficient power calculation based on a single reference point, reducing unnecessary energy expenditure while maintaining the required feedback reliability.
3Productivity
If time domain bundling is configured for multiple PDSCHs, then resource utilization efficiency is improved, but power control complexity increases
Solution Approach 1:
The patent extracts a single reference PDSCH (the last one) from the time domain bundled PDSCHs for power control purposes. This extraction approach maintains the resource utilization benefits of time domain bundling while simplifying power control by focusing on one representative PDSCH rather than managing power for all bundled PDSCHs individually.
Data Source
AI summary
A method and apparatus for transmitting a PUCCH in a wireless communication system are disclosed. According to an embodiment of the present disclosure, the method includes receiving, from a base station, first configuration information related to time domain bundling, receiving, from the base station, at least one PDSCH in at least one PDSCH reception occasion, and transmitting, to the base station, a PUCCH including HARQ-ACK information for the at least one PDSCH, and transmission power for the PUCCH is based on a specific PDSCH among the at least one PDSCH, and the specific PDSCH is associated with a last SLIV among at least one SLIV included in a TDRA row indicated by DCI.