HARQ-ACK Codebook Selection for Wireless Uplink Retransmissions
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Solution Overview
Problem
Current wireless communications networks face challenges in efficiently handling communications for a wide range of devices with different data traffic profiles and requirements, particularly in supporting high reliability and low latency for services like Ultra Reliable Low Latency Communications (URLLC).
Innovation Solution
The method involves receiving downlink transmissions in physical downlink shared channel resources, determining Hybrid Automatic Repeat Request (HARQ) acknowledgments, and selecting one of multiple configured HARQ-ACK codebooks to transmit cancelled HARQ-ACKs based on specific conditions, such as the number of cancelled HARQ-ACKs or HARQ Process Numbers, to optimize retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK retransmissions are handled using traditional methods, then all cancelled HARQ-ACKs are retransmitted, but this increases overhead and reduces communication efficiency
Solution Approach 1:
The patent extracts and identifies only the cancelled HARQ-ACK processes from the complete HARQ-ACK codebook, separating them from successfully transmitted ACKs. This allows selective retransmission of only the necessary feedback information, reducing overhead while maintaining reliability.
Solution Approach 2:
The patent introduces dynamic selection of HARQ-ACK codebook types (Type-1, Type-2, Type-3) based on the specific transmission scenario and cancellation status. This dynamic adaptation optimizes the balance between reliability and overhead for different communication conditions.
2Productivity
If multiple HARQ-ACK codebooks are configured for different scenarios, then communication efficiency is improved, but device complexity increases
Solution Approach 1:
The patent pre-configures multiple HARQ-ACK codebook types (Type-1, Type-2, Type-3) with different characteristics before actual transmission occurs. Each codebook type is prepared in advance for specific scenarios, allowing rapid selection without real-time computation, thus improving efficiency while managing complexity.
Solution Approach 2:
The patent changes the structure and content parameters of HARQ-ACK codebooks based on transmission requirements. Different codebook types have different formats, sizes, and content compositions, allowing optimization for specific scenarios without requiring a single complex universal structure.
Data Source
AI summary
A method of operating a communications device to receive data from a wireless communications network is provided. The method comprises receiving a plurality of downlink transmissions in physical downlink shared channel resources of a wireless access interface provided by the wireless communications network. Each downlink transmission is a transmission of a data unit transmitted according to a different Hybrid Automatic Repeat Request, HARQ, type process. The method comprises determining that an uplink transmission of the HARQ-ACKs, which is scheduled in uplink resources of the wireless access interface, is cancelled and cannot be transmitted in the scheduled uplink resources and receiving a trigger from the wireless communications network to transmit the cancelled HARQ-ACKs in subsequently scheduled uplink resources by selecting one of a plurality of configured HARQ-ACK codebooks to transmit the cancelled HARQ ACKs, wherein the configured HARQ-ACK codebook is selected based on one or more conditions.