On-Demand Aborted HARQ Codebook Retransmission in 5G NR
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Solution Overview
Problem
In mobile communications, especially with 3GPP Release 16 New Radio (NR), there is a need to recover aborted lower-priority HARQ codebooks due to collisions with higher-priority codebooks, which leads to unnecessary retransmissions of downlink packets.
Innovation Solution
Implementing on-demand transmission schemes where the processor aborts the transmission of lower-priority messages, stores the payload, and retransmits it in subsequent slots or sub-slots, or reports the HARQ status upon request, allowing for autonomous retransmission using original or alternative resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lower-priority HARQ codebook transmission is aborted due to collision with higher-priority codebook, then higher-priority communication reliability is improved, but lower-priority communication efficiency deteriorates
Solution Approach 1:
The patent implements a mechanism where aborted HARQ codebooks are not permanently discarded but recovered through autonomous retransmission. The UE stores the aborted codebook information and automatically retransmits it in subsequent uplink opportunities, thereby recovering the lost lower-priority communication efficiency while maintaining the priority-based abortion mechanism for reliability-critical transmissions.
Solution Approach 2:
The patent employs preliminary action by pre-storing the aborted HARQ codebook payloads in the UE before they are needed for retransmission. This allows the UE to quickly recover and retransmit the aborted lower-priority data without requiring complex real-time processing or network coordination, thus efficiently resolving the productivity deterioration caused by the abortion.
2Loss of information
If all downlink packets in aborted HARQ codebook are retransmitted, then data completeness is improved, but network resource waste increases
Solution Approach 1:
The patent extracts only the necessary retransmission information from the aborted HARQ codebook and sends it selectively. Rather than retransmitting all downlink packets, the mechanism identifies and retransmits only the specific codebook information that was aborted, thereby maintaining data completeness while minimizing network resource waste through targeted retransmission.
Solution Approach 2:
The patent applies partial action by retransmitting only the portion of the HARQ codebook that was aborted rather than the entire codebook. This selective retransmission approach ensures data completeness for the affected packets while avoiding the excessive resource consumption that would result from retransmitting all packets in the original codebook.
3Productivity
If autonomous retransmission is implemented, then communication efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously manage the retransmission of aborted HARQ codebooks without requiring continuous network coordination. The UE independently stores, identifies, and retransmits the aborted codebook information using its own processing capabilities, thereby improving communication efficiency while limiting complexity growth to only what is necessary for the autonomous function.
Solution Approach 2:
The patent employs universality by designing the autonomous retransmission mechanism to leverage existing UE functionalities such as buffer storage, HARQ process management, and uplink transmission capabilities. By reusing existing multi-functional components rather than introducing dedicated new subsystems, the patent improves communication efficiency while minimizing the increase in device complexity.
Data Source
AI summary
An apparatus aborts a transmission of a first message of a first type of traffic in a first slot or sub-slot without resuming the transmission in the first slot or sub-slot. The apparatus then stores a payload of the first message. The apparatus later retransmits the payload in full in a second slot or sub-slot that is subsequent the first slot or sub-slot.