Base Station HARQ-ACK Codebook Segmentation for Channel Access
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Solution Overview
Problem
Current wireless communication systems face limitations in flexibility and efficiency, particularly in improving communication capacity, speed, and flexibility, especially in the communication structure used between base stations and user equipment.
Innovation Solution
The implementation of new signaling procedures and configurations in base stations and user equipment, including semi-static Physical Downlink Shared Channel Hybrid Automatic Repeat Request-Acknowledgment (PDSCH HARQ-ACK) codebooks, maximum codewords scheduled by Downlink Control Information (DCI), and contention window adjustments based on HARQ-ACK feedback, to enhance channel access and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If new signaling procedures and configurations are implemented to improve communication flexibility and efficiency, then communication capacity and speed are improved, but device complexity and system complexity increase
Solution Approach 1:
The patent segments the HARQ-ACK codebook into multiple parts, where each part corresponds to different PDSCH reception scenarios. This segmentation allows the system to handle complex communication requirements through modular, manageable components rather than a monolithic complex structure, thereby improving communication capacity while controlling system complexity through organized modularity
Solution Approach 2:
The patent implements dynamic adjustments to the HARQ-ACK codebook structure based on actual PDSCH reception conditions and DCI formats. The codebook dynamically adapts its size and composition according to the number of PDSCHs received, the DCI format type, and other operational parameters, enabling the system to optimize communication efficiency while maintaining manageable complexity through adaptive rather than static configuration
2Productivity
If semi-static PDSCH HARQ-ACK codebooks are configured to improve communication efficiency, then resource allocation efficiency is improved, but adaptability to different communication scenarios decreases
Solution Approach 1:
The patent changes key parameters of the HARQ-ACK codebook based on communication scenario requirements. The codebook size, structure, and composition are adjusted as parameters according to the number of PDSCHs received, the DCI format type (type 1 or type 2), and other scenario-specific conditions. This parameter-based adaptation enables the system to maintain semi-static configuration efficiency while achieving dynamic adaptability to different communication scenarios
3Device complexity
If maximum codewords scheduled by DCI are limited to two to simplify system configuration, then device complexity is reduced, but communication flexibility is reduced
Solution Approach 1:
The patent applies partial action by setting the maximum codewords to two, which is sufficient for most communication scenarios without requiring full support for higher numbers of codewords. This partial implementation reduces configuration complexity while maintaining adequate communication flexibility for typical use cases, avoiding the need to support excessively high numbers of codewords that would increase system complexity without proportional benefit
Data Source
AI summary
A base station which communicates with a user equipment (UE) is described. The RRC configuration information may indicate that a maximum number of codewords scheduled by DCI is two. The base station may comprise transmitting circuitry configured to, after a channel access procedure, transmit, to the UE, a PDSCH which contains only a first transport block. The base station may further comprise receiving circuitry configured to receive, from the UE, a HARQ-ACK feedback including at least a first HARQ-ACK information bit and a second HARQ-ACK information bit. The first HARQ-ACK information bit may correspond to the first transport block of the PDSCH. The second HARQ-ACK information bit may be set to NACK. A contention window for the channel access procedure may be adjusted using the HARQ-ACK feedback, wherein the second HARQ-ACK information bit may be ignored.