Multi-Beam PDCCH Transmission with Preconfigured TCI States
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Solution Overview
Problem
In high-frequency communication scenarios, the reliability of control channel transmission is a critical issue that needs to be enhanced, particularly in ultra-reliable and low latency communications (URLLC), due to potential beam occlusion and other factors that can block the physical downlink control channel (PDCCH), leading to unsuccessful data scheduling.
Innovation Solution
A transmission method and apparatus that determine control channel information and activated Transmission Configuration Indicator (TCI) to establish a correspondence, enabling reliable reception of control channels by mapping PDCCH to resource elements and configuring TCI states to enhance reliability, including grouping monitoring time units and frequency domain resources based on specific parameters and signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-beam control channel transmission is used, then device complexity is reduced, but transmission reliability deteriorates due to beam occlusion blocking the PDCCH
Solution Approach 1:
The patent divides the control channel transmission into multiple independent beams (first control channel beam and second control channel beam), each transmitted through different transmission configuration indicator (TCI) states. This segmentation allows the system to transmit control channel information through multiple paths, ensuring that if one beam is blocked by occlusion, the other beam can still deliver the control information, thereby improving transmission reliability without requiring complex multi-beam coordination protocols
Solution Approach 2:
The patent pre-configures multiple TCI states (first TCI state and second TCI state) before control channel transmission. These TCI states contain predetermined beamforming parameters and transmission configurations that are prepared in advance. When control channel transmission is needed, the system can immediately select from the pre-configured TCI states based on beam occlusion detection, avoiding the need for complex real-time beam configuration and reducing transmission latency
2Reliability
If multiple TCI states are configured for control channel transmission, then transmission reliability improves through diversity, but information processing complexity increases
Solution Approach 1:
The patent assigns different local qualities (distinct beamforming parameters and transmission characteristics) to different TCI states. The first TCI state is optimized for one beam direction while the second TCI state is optimized for another beam direction. This local optimization allows each TCI state to be specifically tuned for its intended transmission path, improving reliability through diversity while keeping each individual TCI state configuration relatively simple and manageable
Solution Approach 2:
The patent configures and maintains multiple TCI states (excessive action) beyond what a single-beam system would use, but the system activates and processes only the necessary subset at any given time based on beam occlusion conditions. This approach provides the reliability benefits of multiple configurations while avoiding the full complexity of managing and processing all possible TCI states simultaneously, as the UE only needs to monitor and decode control channels on the currently active beam
Data Source
AI summary
Provided are a transmission method and apparatus, a communication node, and a storage medium. The transmission method includes: determining control channel information and activated Transmission Configuration Indicator (TCI); determining a correspondence between the control channel information and the activated TCI; and receiving a control channel corresponding to the control channel information based on the correspondence and the activated TCI.