PUCCH Carrier Switching with Multiple HARQ-ACK Codebooks
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing physical uplink control channel (PUCCH) carrier switching for hybrid automatic repeat request acknowledgement (HARQ-ACK) codebooks, leading to suboptimal performance in handling downlink communications.
Innovation Solution
Implementing a configuration and indication mechanism for PUCCH carrier switching with multiple HARQ-ACK codebooks, enabling dynamic or semi-static switching based on carrier-specific configurations, to enhance HARQ feedback transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PUCCH carrier switching is implemented for HARQ-ACK codebooks, then HARQ feedback transmission efficiency is improved, but system complexity increases due to multiple codebook configurations
Solution Approach 1:
The patent segments the HARQ-ACK feedback mechanism by introducing multiple separate codebooks (first HARQ-ACK codebook and second HARQ-ACK codebook) instead of using a single codebook. Each codebook can be independently configured and switched, allowing the system to manage complexity by dividing the feedback function into distinct, manageable segments that can be activated based on specific conditions or carriers.
Solution Approach 2:
The patent implements dynamic PUCCH carrier switching capability where the system can dynamically select which PUCCH carrier to use for transmitting HARQ-ACK feedback based on the configured codebooks. This dynamic adaptation allows the system to optimize performance by switching carriers in response to changing channel conditions or traffic patterns, thereby improving feedback transmission efficiency without permanently increasing complexity across all operating states.
2Adaptability or versatility
If multiple HARQ-ACK codebooks are configured for different carriers, then adaptability to different carrier conditions is improved, but configuration and management complexity increases
Solution Approach 1:
The patent applies local quality by configuring different HARQ-ACK codebooks with specific properties tailored to individual carrier characteristics. Each codebook can be independently configured with parameters optimized for its associated carrier's conditions, such as different feedback timing, resource allocations, or modulation schemes. This allows each part of the system to have the specific quality needed for its local carrier environment rather than using a uniform configuration across all carriers.
Solution Approach 2:
The patent creates a universal framework where the PUCCH carrier switching mechanism can handle multiple HARQ-ACK codebooks through a common configuration and management structure. The base station and UE share a unified understanding of which codebook to use under which conditions, providing a multi-functional system that can adapt to different carrier conditions while maintaining consistent overall control and management procedures.
3Loss of time
If dynamic PUCCH carrier switching is implemented, then latency is reduced by selecting optimal carriers, but control signaling overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple HARQ-ACK codebooks and their associated PUCCH carrier mappings before actual data transmission begins. The base station provides advance configuration information to the UE about which codebooks are available and under what conditions they should be used. This preliminary setup eliminates the need for real-time negotiation or complex runtime decision-making, allowing the UE to quickly select the appropriate codebook and carrier based on pre-established rules, thereby reducing latency while keeping control signaling overhead manageable through efficient pre-planning.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a configuration of a first hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook and a second HARQ-ACK codebook, wherein the configuration indicates that physical uplink control channel (PUCCH) carrier switching is enabled for at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook. The UE may receive an indication of a PUCCH carrier switch for the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook. The UE may receive a downlink communication associated with the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook. The UE may transmit HARQ feedback a target PUCCH carrier based at least in part on the indication of the PUCCH carrier switch. Numerous other aspects are described.