Multi-TRP Downlink Channel Management via CORESET Pool Indexing
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Solution Overview
Problem
Current wireless communication systems face challenges in supporting explosive data traffic, high per-user data rates, a large number of connected devices, very low end-to-end latency, and high-energy efficiency, particularly in next-generation mobile communication systems.
Innovation Solution
The method involves a user equipment (UE) receiving and transmitting downlink channels using multiple transmission and reception points (TRPs), with specific techniques for configuring control resource sets, constructing HARQ-ACK codebooks, and determining uplink channel resources to efficiently manage HARQ-ACK information across multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmission reception points (TRPs) are used to support explosive data traffic and high per-user data rates, then the capacity and reliability of the wireless communication system are enhanced, but the device complexity and difficulty of managing downlink channels increase
Solution Approach 1:
The patent segments the downlink channel management by introducing separate control resource sets (CORESETs) for different TRPs. Each TRP is associated with a specific CORESET, allowing the UE to independently manage control information from multiple TRPs. This segmentation resolves the technical contradiction by organizing the complex multi-TRP system into manageable, independent units while maintaining high data traffic capacity.
Solution Approach 2:
The patent introduces a new dimension for distinguishing TRPs by assigning different CORESET pool indices to different TRPs. This dimensional approach allows the system to handle multiple TRPs without increasing temporal or spatial complexity, as each TRP can be identified through its unique CORESET pool index. This resolves the contradiction by adding an organizational dimension that simplifies multi-TRP management.
2Reliability
If multiple control resource sets are configured for different TRPs, then the reliability of downlink channel reception is improved, but the difficulty of detecting and measuring control resources increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple control resource sets with distinct CORESET pool indices before downlink channel reception. The UE is provided with configuration information that includes these pre-defined resource sets, allowing it to quickly and reliably detect control resources from multiple TRPs without complex real-time detection. This resolves the contradiction by preparing the detection framework in advance, ensuring reliability while simplifying the actual detection process.
3Reliability
If HARQ-ACK information is transmitted for multiple downlink channels from different TRPs, then the reliability of data transmission is enhanced, but the use of uplink channel resources increases
Solution Approach 1:
The patent merges HARQ-ACK information from multiple downlink channels into a single uplink transmission. By combining acknowledgment information for multiple TRPs into one unified HARQ-ACK message, the system maintains high data transmission reliability while reducing uplink channel resource usage. This resolves the contradiction by consolidating multiple feedback transmissions into a single efficient communication event.
Data Source
AI summary
A method for transmitting and receiving a downlink channel in a wireless communication system and a device therefor are disclosed. Specifically, a method of receiving, by a user equipment (UE), a downlink channel in a wireless communication system, the method comprising receiving configuration information related to a plurality of control resource sets, wherein an index of a control resource set group associated with each control resource set is indicated based on the configuration information; and receiving (i) a first downlink channel based on a first control resource set and (ii) a second downlink channel based on a second control resource set, wherein, based on that an index of a first control resource set group associated with the first control resource set is not indicated, the index of the first control resource set group is set to 0.