Multi-Slot HARQ-ACK Codebook Scheduling for Efficient PDSCH Decoding
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in signal transmission and reception, particularly in 3GPP-based systems, due to limited resource allocation and high energy consumption in decoding physical downlink control channels, which are exacerbated by the need for improved latency and data transfer rates in 5G technologies.
Innovation Solution
A method and apparatus for transmitting a semi-static HARQ-ACK codebook in a wireless communication system, utilizing a user equipment and base station that determine PDSCH candidates based on TDRA tables and K1-sets, allowing efficient allocation and reception of HARQ-ACK codebooks through non-overlapping HARQ-ACK occasions and time domain bundling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple user equipments share PDCCH resources through CCE combinations, then resource allocation efficiency is improved, but decoding time and energy consumption increase
Solution Approach 1:
The patent segments the HARQ-ACK codebook into multiple parts, where each part corresponds to a specific PDSCH group or service type. This segmentation allows the UE to decode and process HARQ-ACK information for different segments independently, reducing the overall decoding time while maintaining efficient resource allocation through shared PDCCH resources.
Solution Approach 2:
The patent introduces dynamic HARQ-ACK codebook determination based on received DCI formats, where the codebook type (first type or second type) is dynamically selected according to the DCI format received. This dynamic approach enables flexible adaptation of decoding complexity and time requirements based on current resource allocation conditions, resolving the contradiction between efficient resource sharing and decoding time.
2Adaptability or versatility
If dynamic HARQ-ACK codebook determination is used, then adaptability to different scheduling scenarios is improved, but system complexity increases
Solution Approach 1:
The patent changes the parameter of HARQ-ACK codebook type based on received DCI formats, allowing the system to adapt between first-type and second-type codebooks depending on scheduling requirements. This parameter change approach provides high adaptability to different scheduling scenarios while maintaining manageable system complexity through standardized codebook structures and determination rules.
3Reliability
If HARQ-ACK codebooks are transmitted for all PDSCH candidates, then reliability of acknowledgment is improved, but uplink resource consumption increases
Solution Approach 1:
The patent extracts and processes only the necessary HARQ-ACK information for actually received PDSCHs by determining PDSCH candidates based on received DCI formats and extracting corresponding HARQ-ACK codebook parts. This extraction approach maintains acknowledgment reliability for received data while reducing uplink resource consumption by avoiding transmission of codebook entries for non-received PDSCHs.
Solution Approach 2:
The patent implements partial action by transmitting only the necessary portions of HARQ-ACK codebooks corresponding to actually received PDSCHs, rather than transmitting complete codebooks for all possible PDSCH candidates. This partial transmission approach maintains sufficient acknowledgment reliability while significantly reducing uplink resource consumption.
Data Source
AI summary
The present invention relates to a wireless communication system and, more particularly, to a method comprising the steps of: receiving a PDCCH for multi-slot scheduling; determining a PDSCH candidate for each slot on the basis of information in the PDCCH; and transmitting a semi-static HARQ-ACK codebook on the basis of the determined PDSCH candidate of each slot, and to an apparatus therefor.