HARQ Feedback Scheduling Across Multiple Codebooks Under UE Timing Limits
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing hybrid automatic repeat request (HARQ) feedback due to timing ambiguities and insufficient processing time at the user equipment (UE), leading to inefficiencies and resource waste.
Innovation Solution
The UE determines whether to cancel or transmit HARQ feedback based on its minimum processing time and the time difference between reception and transmission intervals, using different HARQ codebooks to manage HARQ feedback communication effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE defers HARQ feedback transmission to a target TTI, then the likelihood of successful data reception is improved, but timing ambiguities and resource waste occur due to insufficient processing time
Solution Approach 1:
The patent makes the HARQ feedback transmission dynamic by allowing the UE to adaptively choose between deferred transmission and immediate transmission based on its processing capability. The UE dynamically adjusts its behavior by comparing the time difference between reception and target TTI with its minimum processing time, enabling flexible resource management while maintaining reliability.
Solution Approach 2:
The patent changes the transmission timing parameter based on the UE's processing capability. By introducing a threshold comparison (time difference vs. minimum processing time), the system transitions from a fixed deferred transmission approach to a variable timing approach, where the transmission time is adjusted according to the UE's ability to process the feedback in time.
2Productivity
If the UE transmits deferred HARQ feedback at the target TTI, then feedback is provided, but behavior ambiguity occurs when DCI triggers a different HARQ codebook
Solution Approach 1:
The patent applies preliminary action by having the UE evaluate its processing capability and determine the appropriate transmission behavior before the actual transmission occurs. The UE proactively compares the time difference with its minimum processing time and decides whether to cancel or transmit the deferred feedback, eliminating ambiguity by pre-determining the correct action based on capability assessment.
Solution Approach 2:
The patent introduces a feedback mechanism where the UE's capability (minimum processing time) feeds into the transmission decision. The UE uses its own capability information to determine whether it can meet the deferred transmission timing, creating a self-regulating system that resolves behavior ambiguity through capability-based decision-making.
3Reliability
If the UE uses multiple HARQ codebooks (type 1, type 2, type 3), then HARQ feedback communication is enhanced, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a unified decision-making framework that works across all three HARQ codebook types. The same capability-based comparison mechanism (time difference vs. minimum processing time) is used regardless of which codebook type is involved, allowing the UE to handle multiple codebook types through a single universal procedure, thereby reducing complexity while maintaining enhanced feedback capabilities.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may defer transmission of a first feedback message to a target transmission time interval (TTI). During a reception time interval, a base station may transmit, to the UE, downlink control information (DCI) that triggers the UE to schedule a second feedback message, where the first feedback message and the second feedback message are associated with different types of hybrid automatic repeat request (HARQ) codebooks. The UE may compare a minimum processing time of the UE with a time difference between the reception time interval and the target TTI and determine (e.g., evaluate) whether to cancel transmission of the first feedback message based on the comparison. In accordance with the determining, the UE may transmit at least one of the first feedback message or the second feedback message.