Communication Apparatus Beam Stability via Reference Signal Feedback
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Solution Overview
Problem
In wireless communication systems, particularly during the random access procedure, maintaining a stable wireless link between the base station and terminal apparatus is challenging due to unstable beam management, which can hinder the initiation of communication.
Innovation Solution
A communication apparatus and method that transmit multiple reference signals with different antenna information and acquire control information from the terminal apparatus after a random access response, allowing for selection and notification of the appropriate reference signals based on reception results to stabilize the communication link.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam management is performed to provide high-quality communication links, then communication quality is improved, but wireless link stability deteriorates during random access procedure
Solution Approach 1:
The base station transmits multiple reference signals with different antenna information before the random access procedure is completed. The terminal apparatus measures these reference signals in advance and reports the measurement results, allowing the base station to determine appropriate antenna information for subsequent communication before the link becomes unstable
Solution Approach 2:
The terminal apparatus feeds back control information containing measurement results of reference signals to the base station. This feedback mechanism allows the base station to adjust antenna information based on actual channel conditions, improving link stability while maintaining communication quality
2Reliability
If multiple reference signals with different antenna information are transmitted, then wireless link stability is improved, but device complexity increases
Solution Approach 1:
The reference signals are segmented and transmitted through different antenna ports with different antenna information. Each reference signal corresponds to specific antenna configuration, allowing the base station to manage complexity by organizing multiple signals in a structured manner rather than handling them as a single complex signal
3Measurement precision
If beam management is performed during random access procedure, then communication quality is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
Reference signals are transmitted in advance during the random access procedure, allowing the terminal apparatus to perform measurements before the actual communication begins. This preliminary measurement approach simplifies the detection process compared to attempting measurements during active communication when conditions are more variable
Data Source
AI summary
[Object] To provide a wireless link usable in a more stable manner in a situation where beam management is performed. A communication apparatus includes: a control unit that performs control such that a plurality of reference signals associated with pieces of antenna information different from each other is transmitted to a terminal apparatus; and an acquisition unit that acquires control information corresponding to at least any one of the plurality of reference signals from the terminal apparatus after a random access response in a random access procedure is transmitted to the terminal apparatus. The control unit controls following communication with the terminal apparatus on the basis of the antenna information corresponding to the acquired control information.