HARQ-ACK Codebook Construction for Multi-TRP Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving HARQ-ACK information across multiple transmission reception points (TRPs), which affects data transmission speed and reliability, especially with the increasing demand for higher data rates and low latency in next-generation mobile communication systems.
Innovation Solution
A method is introduced for constructing a HARQ-ACK codebook considering multi-TRP operations, where the user equipment (UE) receives configuration information about control resource sets, determines the physical uplink control channel (PUCCH) resource for transmitting HARQ-ACK information, and transmits it based on the determined resource, using quasi co-location (QCL) information and transmission configuration indication (TCI) related to each control resource set.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmission reception points (TRPs) are used to transmit data to a user equipment (UE), then data transmission speed and reliability are improved, but the complexity of constructing and managing HARQ-ACK codebooks increases
Solution Approach 1:
The patent segments the HARQ-ACK codebook construction process by introducing separate downlink assignment indicator (DAI) counters for each TRP. Each TRP maintains its own DAI counter to track the number of downlink assignments, allowing the UE to independently manage HARQ-ACK feedback for multiple TRPs. This segmentation reduces the complexity of constructing a unified codebook across multiple TRPs while maintaining improved data transmission speed and reliability.
2Productivity
If multiple TRPs transmit data to a UE simultaneously, then system capacity and data rate are increased, but the overhead for managing multiple HARQ-ACK codebooks increases
Solution Approach 1:
The patent merges the HARQ-ACK feedback mechanisms for multiple TRPs into a unified codebook structure. By combining the DAI counters and HARQ-ACK bits from different TRPs into a single codebook, the system reduces feedback overhead compared to maintaining separate codebooks for each TRP. This merging approach allows the UE to efficiently manage HARQ-ACK feedback for multiple TRPs while maintaining increased system capacity and data rate.
3Reliability
If separate HARQ-ACK codebooks are maintained for each TRP, then feedback accuracy is improved, but the time and resources required for codebook management increase
Solution Approach 1:
The patent implements preliminary action by pre-configuring the UE with multiple downlink assignment indicator (DAI) counters, one for each TRP, before data transmission begins. This pre-configuration allows the UE to efficiently track and manage downlink assignments from multiple TRPs without requiring complex real-time codebook construction. The preliminary setup maintains feedback accuracy while reducing the time and resources required for ongoing codebook management.
Data Source
AI summary
A method for transmitting and receiving HARQ-ACK information in a wireless communication system and a device therefor are disclosed. Specifically, a method of transmitting, by a user equipment (UE), HARQ-ACK information in a wireless communication system, the method comprising receiving configuration information related to a plurality of control resource sets; receiving first downlink control information (DCI) based on the first control resource set and second DCI based on the second control resource set via a physical downlink control channel (PDCCH); and transmitting the HARQ-ACK information based on the determined PUCCH resource, wherein an order of the first DCI and the second DCI is determined based on (i) an index of a monitoring occasion related to the PDCCH, (ii) a cell index, and (iii) an index of each control resource set pool, wherein the PUCCH resource is determined based on a last DCI among the first DCI and the second DCI.