HARQ-ACK Codebook Segmentation for Multi-TRP Wireless Nodes
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing HARQ feedback for multicast and broadcast transmissions, leading to inefficiencies in resource utilization and increased signaling overhead, particularly in scenarios with multiple traffic types and parallel downlink transmissions.
Innovation Solution
The proposed method involves a unified solution for wireless communications that includes receiving and transmitting information blocks to determine HARQ-ACK bits, using PDCCHs to identify cell groups and resource pools, and employing orthogonal time-domain resources to optimize HARQ-ACK codebook construction and multiplexing, thereby reducing overhead and improving resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate HARQ-ACK codebooks are used for multiple TRPs, then reliability of HARQ-ACK transmission is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent segments the HARQ-ACK codebook into multiple sub-codebooks, where each sub-codebook corresponds to a specific TRP. This segmentation allows separate management of HARQ-ACK feedback for different TRPs while maintaining overall system reliability. The UE constructs multiple sub-codebooks based on PDCCH monitoring in different search space sets, enabling targeted retransmission handling without managing a single complex codebook.
Solution Approach 2:
The patent introduces search space set configurations as an intermediary mechanism to associate PDCCH monitoring with specific TRPs. By configuring multiple search space sets with different monitoring parameters, the system indirectly manages multiple TRP connections without requiring direct complex interactions between TRPs and the UE, simplifying the overall control structure.
2Adaptability or versatility
If multiple search space sets are configured for different TRPs, then adaptability to multi-TRP scenarios is improved, but device complexity increases
Solution Approach 1:
The patent makes search space sets multi-functional by enabling them to serve both as PDCCH monitoring structures and as TRP identification mechanisms. Each search space set is configured with parameters that allow it to be associated with a specific TRP, making the same structural element perform multiple functions: controlling PDCCH monitoring and identifying the serving TRP, thereby reducing the need for separate configuration structures.
Solution Approach 2:
The patent utilizes parameter changes in search space set configurations to differentiate TRPs. By modifying monitoring parameters such as monitoring periodicity, offset, and duration in different search space sets, the system adapts to different TRP characteristics without adding new structural elements. This parameter-based differentiation enables flexible adaptation to various multi-TRP scenarios while maintaining a unified configuration framework.
Data Source
AI summary
The present disclosure provides a method and device in a node used for wireless communications. A node receives a first information block, receives a first PDCCH, the first PDCCH belongs to a first search space set; transmits W bit sets, the first information block is used to determine the W bit sets; the first search space set is associated with a first control resource set, the first control resource set belongs to a first control resource pool; the first control resource pool is used to determine a first bit set out of the W bit sets, the first bit set comprises X bit subsets; the X bit subsets are respectively for X cell groups, and the first PDCCH is used for a first serving cell; the first PDCCH is used to determine a first identifier. The present disclosure guarantees the successful transmission of HARQ.