One-shot HARQ Feedback Buffer for Ambiguous ACK/NACK Mapping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is an ambiguity in the mapping of acknowledgement (ACK)/negative acknowledgement (NACK) status between user equipment (UE) and the network in one-shot hybrid automatic repeat request (HARQ) feedback, particularly when the same HARQ process ID is reused for multiple physical downlink shared channel (PDSCH) transmissions, leading to communication performance and reliability issues.
Innovation Solution
A user equipment (UE) with a processor configured to update the ACK/NACK status in a one-shot AN buffer based on the buffered status and PDSCH transmission status, reducing ambiguity by setting or maintaining statuses as pending, default, or frozen, depending on transmission types and outcomes, to ensure accurate feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one-shot HARQ feedback is used to simplify the feedback mechanism, then the feedback process is simplified, but ACK/NACK status ambiguity occurs when the same HARQ process ID is reused for multiple PDSCH transmissions
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with a one-shot HARQ feedback function and initializing the one-shot AN buffer before PDSCH transmissions occur. The UE proactively manages the ACK/NACK status by updating the buffer in advance based on scheduled transmissions, ensuring that when HARQ process ID is reused, the correct status is already prepared and mapped, preventing ambiguity before it occurs.
Solution Approach 2:
The patent implements feedback by having the UE continuously update the one-shot AN buffer with the latest ACK/NACK status for each HARQ process ID based on received PDSCH transmissions. This ongoing feedback mechanism ensures that the buffer always contains the most current and accurate status information, allowing the UE to correctly identify which transmission corresponds to which HARQ process ID even when IDs are reused.
2Productivity
If HARQ process ID is reused for multiple PDSCH transmissions to improve resource utilization, then spectrum efficiency is improved, but mapping ambiguity between UE and network increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with a one-shot HARQ feedback function and initializing the one-shot AN buffer before PDSCH transmissions occur. The UE proactively manages the ACK/NACK status by updating the buffer in advance based on scheduled transmissions, ensuring that when HARQ process ID is reused, the correct status is already prepared and mapped, preventing ambiguity before it occurs.
Solution Approach 2:
The patent implements feedback by having the UE continuously update the one-shot AN buffer with the latest ACK/NACK status for each HARQ process ID based on received PDSCH transmissions. This ongoing feedback mechanism ensures that the buffer always contains the most current and accurate status information, allowing the UE to correctly identify which transmission corresponds to which HARQ process ID even when IDs are reused.
3Measurement precision
If the UE buffers ACK/NACK status for multiple transmissions, then feedback accuracy is improved, but the buffer management complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the buffer management into discrete, manageable units - each HARQ process ID has its own dedicated entry in the one-shot AN buffer. This segmentation allows the UE to track and update individual transmission statuses independently, making the overall buffer management systematic and less complex despite handling multiple transmissions.
Solution Approach 2:
The patent implements self-service by having the UE automatically update its own buffer based on received PDSCH transmissions and scheduled HARQ processes. The UE autonomously manages the ACK/NACK status without requiring external intervention or complex coordination, simplifying the buffer management process while maintaining high feedback accuracy.
Data Source
AI summary
A user equipment (UE) and a method for one-shot hybrid automatic repeat request (HARQ) feedback of the same capable of reducing acknowledgement (ACK)/negative acknowledgement (NACK) (AN) status ambiguity between a network (e.g., gNB) and the UE are provided. The method includes being configured with a one-shot HARQ-ACK feedback function, receiving a physical downlink shared channel (PDSCH) transmission with an associated determined HARQ process identity (ID), and updating an AN status in a one-shot AN buffer for the associated determined HARQ process ID based on an already buffered AN status of the associated determined HARQ process ID and a PDSCH transmission status.