HARQ-ACK Feedback for SPS Release and Same-Slot PDSCH
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Solution Overview
Problem
The existing New Radio (NR) technology lacks a clear solution for Hybrid Automatic Repeat Request (HARQ) acknowledgment feedback when a Physical Downlink Control Channel (PDCCH) indicating Semi-Persistent Scheduling (SPS) resource release occurs simultaneously with an SPS PDSCH in the same slot, leading to redundant HARQ-ACK feedback issues.
Innovation Solution
A method and apparatus for determining to feed back HARQ-ACK information for the PDCCH indicating SPS resource release while not feeding back for specific SPS PDSCHs within the same slot, using cases like priority, carrier, or configuration index to manage HARQ-ACK feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal receives both a PDCCH indicating SPS resource release and an SPS PDSCH in the same slot, then the terminal needs to transmit HARQ-ACK feedback for both, but there is no redundant HARQ-ACK feedback position available in the semi-static HARQ-ACK codebook
Solution Approach 1:
The patent extracts the HARQ-ACK feedback for the PDCCH indicating SPS resource release from the traditional HARQ-ACK codebook structure. Instead of including it in the codebook, the feedback is transmitted separately through a dedicated PUCCH resource, thereby resolving the conflict between maintaining codebook structure and providing complete feedback
Solution Approach 2:
The patent introduces a new intermediary mechanism: a separate PUCCH resource specifically for transmitting HARQ-ACK feedback of PDCCH indicating SPS resource release. This intermediary channel acts as a mediator between the conflicting requirements of codebook structure and feedback completeness
2Reliability
If the terminal transmits HARQ-ACK feedback for both PDCCH indicating SPS resource release and SPS PDSCH in the same slot, then feedback completeness is improved, but the feedback position becomes ambiguous and unclear
Solution Approach 1:
The patent segments the HARQ-ACK feedback transmission into two distinct parts: (1) HARQ-ACK for SPS PDSCH transmitted through the HARQ-ACK codebook in PUCCH, and (2) HARQ-ACK for PDCCH indicating SPS resource release transmitted through a separate dedicated PUCCH resource. This segmentation eliminates position ambiguity by providing clear separation between the two feedback types
3Adaptability or versatility
If the terminal supports receiving at most A unicast PDSCHs in one slot and A SPS PDSCHs are transmitted, then the terminal reaches its reception capacity limit, but adding PDCCH indicating SPS resource release exceeds the available HARQ-ACK feedback positions
Solution Approach 1:
The patent adds another dimension to the feedback transmission by introducing a separate PUCCH resource dimension. Instead of trying to fit all feedback into the single HARQ-ACK codebook dimension, the feedback for PDCCH indicating SPS resource release is transmitted in a different dimension (separate PUCCH), thereby increasing the total capacity without changing the terminal's PDSCH reception capability
Data Source
AI summary
Disclosed in the present application are an information transmission method and apparatus, used for feeding back hybrid automatic repeat request-acknowledge information to a physical downlink control channel (PDCCH) when the PDCCH indicating a semi-persistent scheduling (SPS) physical downlink shared channel (PDSCH) release and an SPS PDSCH are transmitted in a same time slot. The method provided in the present application includes when the PDCCH indicating the SPS resource release is received in a time slot in which the SPS PDSCH is needed to be received, determining to feed back the hybrid automatic repeat request-acknowledge information to the PDCCH, and not to feed back the hybrid automatic repeat request-acknowledge information to a predetermined SPS PDSCH feedback in the SPS PDSCHs; and transmitting a hybrid automatic repeat request-acknowledgement sequence including the hybrid automatic repeat request-acknowledgement information of the PDCCH.