Dynamic PUCCH Carrier Selection for Timely HARQ-ACK Transmission
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Solution Overview
Problem
In current wireless communication systems, the transmission of physical uplink control channels (PUCCH) is limited to a single carrier, which can lead to delays in ultra-reliable low-latency communications due to slot configurations, particularly when hybrid automatic repeat request acknowledgments (HARQ-ACK PUCCH) cannot be transmitted in the uplink primary carrier.
Innovation Solution
The method involves using predefined bit fields in downlink control channels (DCI) to indicate carrier switching for PUCCH transmission, allowing PUCCH to be transmitted on secondary carriers, and configuring multiple carriers with the same or different subcarrier spacing to facilitate dynamic switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If PUCCH transmission is limited to a single carrier (uplink primary carrier), then device complexity is reduced and ease of operation is improved, but transmission latency increases and reliability deteriorates when the primary carrier is unavailable
Solution Approach 1:
The patent implements dynamic carrier selection for PUCCH transmission by enabling the terminal to switch between a first carrier (primary uplink carrier) and a second carrier (secondary uplink carrier) based on real-time availability. The terminal determines whether the first carrier is available for PUCCH transmission and dynamically selects the second carrier as an alternative when the first carrier is unavailable, thereby reducing transmission latency while maintaining manageable device complexity through rule-based switching logic.
2Reliability
If carrier aggregation with multiple carriers is configured for PUCCH transmission, then transmission reliability and latency are improved, but device complexity and configuration overhead increase
Solution Approach 1:
The patent segments the PUCCH transmission function across multiple carriers by designating a first carrier (primary uplink carrier) and a second carrier (secondary uplink carrier) with specific roles. The terminal is configured with separate carrier settings including subcarrier spacing configurations for each carrier, allowing independent optimization and simplified management of each carrier's function while achieving improved reliability through redundancy.
Solution Approach 2:
The patent utilizes parameter changes in carrier configuration, specifically different subcarrier spacing configurations for the first and second carriers. The terminal can be configured with first and second subcarrier spacings that may be the same or different, allowing flexible adaptation to various transmission requirements while maintaining clear distinction between carriers through parameter differentiation.
3Adaptability or versatility
If new DCI formats or bit fields are introduced to indicate carrier switching, then carrier switching capability is improved, but control signal complexity and overhead increase
Solution Approach 1:
The patent achieves carrier switching capability using existing DCI formats and bit fields that serve multiple functions. The downlink control information includes bit fields that can indicate both PDSCH scheduling information and PUCCH carrier selection, allowing a single DCI structure to perform multiple functions without introducing new formats or increasing overall control signal complexity.
Data Source
AI summary
The present document relates to methods, systems, and devices related to digital wireless communication, and more specifically, to techniques related to determining whether to switch a carrier of control channel resources such as a physical uplink control channel (PUCCH) resource. One example method includes transmitting, by a network node, a carrier indicator message to a terminal, the carrier indicator message indicating a carrier via a predefined bit field in a control indicator field. The method can also include receiving, by the network node, a second message from the terminal on the carrier indicated in the carrier indicator message.