HARQ-ACK Codebook Handling Across Active UL BWP Changes
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Solution Overview
Problem
The challenge of handling HARQ-ACK codebook generation during active BWP changes in wireless communication systems, particularly in scenarios like UL, DL, and SL, is not adequately addressed, leading to complexity and cost issues.
Innovation Solution
A unified solution for determining HARQ-ACK codebooks in wireless communication systems, including methods for receiving and transmitting signals based on target serving cells and time units, to manage HARQ-ACK information bits effectively during BWP changes, reducing complexity and ensuring flexibility and reliability of scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a unified solution is adopted for determining HARQ-ACK codebooks during BWP changes, then device complexity and implementation costs are reduced, but the challenge of adequately addressing HARQ-ACK codebook generation in all scenarios (UL, DL, SL) remains
Solution Approach 1:
The patent applies universality by designing a unified HARQ-ACK codebook determination method that works across multiple scenarios (UL, DL, and SL communications). The same core mechanism using target serving cell identification and time unit determination is applied universally to different communication directions and types, reducing the need for separate handling logic for each scenario while maintaining adequate coverage of all cases.
2Reliability
If carrier switching functionality is supported in PUCCH for URLLC services, then low latency requirements are met, but the impact of active BWP changes on HARQ-ACK codebook generation becomes a key issue
Solution Approach 1:
The patent applies preliminary action by determining the target serving cell and first time unit before generating the HARQ-ACK codebook during BWP changes. This advance determination of key parameters (target serving cell via first signaling, and first time unit relative to BWP change boundary) allows the system to prepare the codebook generation process in advance, reducing the impact of BWP changes on URLLC service reliability while managing the complexity of carrier switching functionality.
3Reliability
If HARQ-ACK information bits are determined based on target serving cell during BWP changes, then feedback reliability is optimized, but the overhead and complexity of managing multiple serving cells increases
Solution Approach 1:
The patent applies local quality by making the HARQ-ACK codebook determination locally adaptive to the target serving cell identified through first signaling. Instead of using a uniform approach for all serving cells, the system determines the first time unit and HARQ-ACK information bits specifically based on the target serving cell's BWP change status. This localized adaptation optimizes feedback reliability for each serving cell while managing overhead through the unified determination mechanism.
Data Source
AI summary
The present disclosure provides a method and a device in a node used for wireless communications. A first receiver receives a first signaling, the first signaling being used to determine a target serving cell and a first time unit, where the target serving cell is either a first serving cell or a second serving cell; a first transmitter determines a first HARQ-ACK codebook and transmits a first signal in the first time unit on the target serving cell, the first signal carrying the first HARQ-ACK codebook; herein, a first time is a boundary time for an active UL BWP change on the first serving cell, a start time for the first time unit being no earlier than the first time; the target serving cell is used to determine whether the first HARQ-ACK codebook comprises a HARQ-ACK information bit for the second time unit on the first serving cell.