Terminal TCI State Selection for Multi-TRP Downlink Control
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving downlink channels from multiple transmission and reception points (TRPs) while maintaining high energy efficiency and low latency, especially with the increasing demand for faster data services and a larger number of connected devices.
Innovation Solution
The method involves a terminal repeatedly receiving a downlink control channel with the same downlink control information from multiple TRPs and determining the transmission configuration indicator (TCI) based on a time offset, allowing for efficient transmission and reception of downlink signals from a single TRP using a default TCI state related to a search space set or control resource set with the lowest identifier in the latest slot monitored.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If downlink control channels are transmitted from multiple TRPs to handle increased data traffic, then system capacity and reliability are improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent segments the downlink control channel transmission by dividing it into multiple transmission occasions (TOs) from different TRPs. Each TO carries the same DCI but is transmitted separately, allowing the terminal to process them in stages rather than handling all transmissions simultaneously, thus reducing processing overhead while maintaining system capacity.
Solution Approach 2:
The patent applies preliminary action by having the terminal repeatedly receive and buffer downlink control information from multiple TRPs before making the final scheduling decision. The terminal stores the DCI from different TOs and uses the first valid DCI it encounters, allowing preprocessing and buffering that reduces real-time processing complexity.
2Reliability
If downlink control channels are repeatedly transmitted from multiple TRPs to improve reliability, then transmission reliability is improved, but transmission time and latency increase
Solution Approach 1:
The patent applies partial action by having the terminal repeatedly receive DCI from multiple TRPs but only process the first valid DCI it encounters. The terminal does not need to process all repeated transmissions,而是 stops after finding the first valid one, thus achieving reliability through repetition while minimizing the time spent on processing.
Solution Approach 2:
The terminal skips processing subsequent DCI receptions once it has successfully received and processed the first valid DCI from any TRP. This rushing through approach allows the system to maintain high reliability through multiple transmission attempts while minimizing the time penalty by not processing redundant information.
3Adaptability or versatility
If the terminal monitors multiple search space sets and CORESETs to determine default TCI state, then adaptability and accuracy are improved, but device complexity increases
Solution Approach 1:
The patent segments the monitoring process by dividing search space sets and CORESETs into groups, with each group associated with specific TRPs. The terminal monitors these segmented groups separately and determines the default TCI state based on the lowest ID within the relevant group, reducing the complexity of monitoring all sets simultaneously while maintaining accuracy.
Solution Approach 2:
The patent applies local quality by having the terminal focus its monitoring efforts on specific search space sets and CORESETs that are locally relevant to each TRP. Instead of uniformly monitoring all sets with equal intensity, the terminal applies differentiated monitoring strategies based on the local configuration and requirements of each TRP group, reducing overall complexity while maintaining determination accuracy.
Data Source
AI summary
A method and a device of transmitting or receiving a downlink channel from multiple transmission and reception points in a wireless communication system is disclosed. A method of receiving a downlink signal by a terminal in a wireless communication system according to an embodiment of the present disclosure may include repeatedly receiving a downlink control channel including same downlink control information (DCI) in at least one transmission occasion (TO) from at least one transmission reception point (TRP); and based on the DCI including control information related to downlink signal reception, based on a time offset between a specific TO of the at least one TO and a receiving timing of a downlink signal related to the DCI being less than a predetermined threshold, receiving the downlink signal from a single TRP based on a default transmission configuration indicator (TCI) state and the default TCI state may be a TCI state related to a search space set or a control resource set (CORESET) having a lowest identifier in a latest slot that the terminal monitors.