Terminal QCL Configuration for Multi-TRP Wireless Data Transmission
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving data in cooperative communication networks, particularly in determining default quasi-co-location (QCL) settings for base stations and terminals.
Innovation Solution
A method and device for transmitting and receiving data in a wireless communication system, which involves receiving control signals from a base station, processing them, and transmitting processed signals back to the base station to determine default QCL settings based on MAC CE in Single/Multi-TRP scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cooperative communication is implemented in wireless communication systems, then network performance and data transmission reliability are improved, but determination of default QCL settings becomes complex and difficult
Solution Approach 1:
The terminal determines default QCL settings autonomously based on pre-configured QCL relationship information and MAC CE indication values, without requiring explicit base station signaling for each scenario. This self-determination mechanism reduces signaling overhead and simplifies the network side complexity while maintaining reliable cooperative communication.
Solution Approach 2:
QCL relationship information is pre-configured between transmission points and terminals before cooperative communication occurs. When MAC CE indication is received, the terminal can immediately apply the appropriate pre-configured QCL settings, avoiding real-time complex determination and reducing latency while ensuring transmission reliability.
2Reliability
If multiple TRPs are used for cooperative communication, then data transmission reliability is enhanced, but the complexity of determining default QCL settings increases
Solution Approach 1:
MAC CE indication values serve as intermediaries that simplify the mapping between multiple TRPs and their corresponding QCL settings. The terminal uses these indication values to select from pre-configured QCL relationship information, reducing the complexity of determining which TRP's QCL settings to apply in multi-TRP scenarios.
Solution Approach 2:
The QCL relationship information is segmented into multiple pre-configured options corresponding to different TRPs. Each segment contains QCL parameters for a specific TRP, allowing the terminal to selectively apply the appropriate segment based on MAC CE indication, thereby managing the complexity of multi-TRP QCL determination.
3Adaptability or versatility
If default QCL settings are determined without pre-configuration, then system adaptability is maintained, but data transmission reliability decreases
Solution Approach 1:
QCL relationship information is pre-configured to ensure reliable data transmission, while MAC CE dynamic indication maintains system adaptability. This combination allows the system to adapt to different transmission scenarios while relying on pre-configured reliable QCL settings for actual data transmission.
Solution Approach 2:
The system combines static pre-configured QCL relationship information with dynamic MAC CE indication. The pre-configuration ensures reliability, while the dynamic indication mechanism allows adaptation to different transmission points and scenarios, achieving both reliability and adaptability simultaneously.
Data Source
AI summary
A method of receiving a PDSCH, by a terminal, in a wireless communication system includes: receiving, from a base station through higher layer signaling, configuration information as to whether information of a transmission configuration indication (TCI) field included in downlink control information (DCI) is to be applied; receiving, from the base station, at least one physical downlink control channel (PDCCH) for scheduling a first PDSCH and a second PDSCH transmitted from different base stations from each other; and when it is configured to apply the TCI field, and when a scheduling time offset between the at least one PDCCH and at least one of the first PDSCH and the second PDSCH is longer than or equal to a beam switching time limit, receiving each of the first PDSCH and the second PDSCH based on a quasi co-location (QCL) parameter of a TCI state indicated by a codepoint of a TCI field included in DCI transmitted through the at least one PDCCH.