Multi-TRP Feedback Configuration Using DCI Indicators
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Solution Overview
Problem
Existing wireless communication systems with multiple transmission reception points (TRPs) face challenges in coordinating configurations that introduce latency and increase signaling overhead due to inefficient feedback mechanisms.
Innovation Solution
A UE is configured with a coordinated transmission mode using downlink control signaling to determine feedback configurations, including indicators for DAI, ARI, and feedback gap, allowing it to transmit feedback messages without additional signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TRPs coordinate different configurations for communications using backhaul links, then communication coordination is improved, but latency increases and signaling overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple coordinated transmission modes (first, second, third modes) with different channel combinations before actual communication occurs. The UE stores these pre-defined modes and can quickly select and switch between them based on current communication needs, eliminating the need for real-time coordination signaling between TRPs and reducing latency while maintaining coordination effectiveness
2Reliability
If TRPs coordinate different configurations for communications using backhaul links, then communication coordination is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts the coordination information from complex backhaul link signaling and embeds it directly into the downlink control information (DCI) that the UE already receives for scheduling. By taking out the coordination configuration and integrating it with existing control signals, the system reduces separate coordination signaling overhead while maintaining effective TRP coordination
Solution Approach 2:
The patent makes the downlink control information serve multiple functions: it not only schedules the downlink transmission but also carries coordination configuration information for multi-TRP operation. This multi-functional approach eliminates the need for separate coordination signaling channels, reducing overall signaling overhead while maintaining coordination capabilities
3Adaptability or versatility
If multiple coordinated transmission modes are configured for multi-TRP communication, then communication flexibility is improved, but feedback configuration complexity increases
Solution Approach 1:
The patent applies self-service by enabling the UE to autonomously determine feedback configuration based on the received DCI and pre-configured transmission modes. The UE independently identifies which transmission mode was used and configures appropriate feedback without requiring additional feedback configuration signaling from the network, simplifying the feedback path while maintaining flexibility
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a configuration message configuring the UE to communicate coordinated transmissions with multiple transmission reception points (TRPs) using a first coordinated transmission mode of a set of different coordinated transmission modes. The UE may receive, based on the configuration message, downlink control information including at least one indicator and receive a first coordinated transmission communicated in accordance with the first coordinated transmission mode. The UE may transmit, in accordance with a feedback configuration corresponding to the at least one indicator and the first coordinated transmission mode, a feedback message for the first coordinated transmission to at least one of the multiple TRPs.