Default Beam Selection Using TCI States for PDCCH Links
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Solution Overview
Problem
In wireless communication, when a network side device does not send beam indication signaling, the terminal device faces challenges in determining the appropriate sending or receiving beam, particularly for channels with fast attenuation in high-frequency ranges.
Innovation Solution
The method involves determining one or multiple transmission configuration indication (TCI) states corresponding to a specific physical downlink control channel (PDCCH) to establish a default beam for communication, allowing the terminal device to communicate effectively without explicit network-side signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam indication signaling is sent by network side device, then terminal device can determine sending beam or receiving beam accurately, but communication reliability deteriorates when signaling is absent in high-frequency ranges
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple TCI states at the terminal device before beam indication signaling is needed. When signaling is absent, the terminal device can immediately select from pre-configured TCI states to determine the default beam, avoiding communication interruption. This resolves the contradiction by preparing beam determination options in advance, ensuring both accuracy and reliability.
Solution Approach 2:
The patent enables self-service by allowing the terminal device to autonomously determine the default beam using pre-configured TCI states when network side device signaling is unavailable. The terminal device independently selects appropriate TCI states based on its stored configuration, eliminating dependency on continuous network signaling and maintaining communication reliability in high-frequency ranges.
2Reliability
If multiple TCI states are configured for default beam determination, then communication reliability improves when signaling is absent, but device complexity increases
Solution Approach 1:
The patent applies universality by designing TCI states with multi-functionality - the same TCI state configuration serves both as beam indication when signaling is present and as default beam determination basis when signaling is absent. This universal configuration approach improves reliability without proportionally increasing device complexity, as the same structural elements serve multiple purposes.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the number of configured TCI states based on communication conditions. The terminal device can configure one or multiple TCI states depending on service requirements and channel conditions, allowing flexibility in balancing reliability improvement against device complexity. This parameter adaptability resolves the contradiction by enabling selective complexity deployment.
Data Source
AI summary
A method for determining a default beam, includes: determining one or multiple transmission configuration indication (TCI) states corresponding to a specific physical downlink control channel (PDCCH); and determining the default beam according to the one or multiple TCI states.