Antenna Selection via Random Access Preamble Reception
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Solution Overview
Problem
There is no established procedure for efficiently establishing a connection between a base station apparatus and a terminal apparatus in a wireless communication system using high-density antennas, where some antennas are selectively used for communication.
Innovation Solution
A control apparatus connected to multiple antennas performs communication with a terminal apparatus using selected antennas based on the reception state of a random access preamble, allowing for efficient antenna selection and user data communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-density antennas are arranged and selectively used for communication, then communication quality uniformity is improved, but connection establishment procedure is undefined
Solution Approach 1:
The system performs preliminary actions by having all antennas simultaneously detect the random access preamble before connection establishment is finalized. This preliminary detection phase allows the system to pre-identify suitable antennas based on reception quality, so that when connection establishment occurs, the appropriate antenna is already selected. This resolves the contradiction by preparing the antenna selection in advance, making the connection procedure well-defined while maintaining communication quality uniformity.
Solution Approach 2:
The system implements dynamic antenna selection where the choice of which antenna to use for communication is not fixed but determined in real-time based on the detected reception state of the random access preamble. This dynamic approach allows the system to adapt to varying channel conditions and terminal positions, ensuring uniform communication quality across the cell while establishing clear connection procedures through standardized selection criteria.
2Reliability
If multiple antennas are used for communication, then communication stability is improved, but antenna selection complexity increases
Solution Approach 1:
The system uses feedback from the random access preamble detection process to guide antenna selection. Each antenna's reception state of the preamble serves as feedback information that indicates its suitability for communication. This feedback mechanism simplifies the selection complexity by providing clear, measurable criteria (reception quality) rather than requiring complex evaluations of multiple antenna parameters simultaneously.
Solution Approach 2:
The system changes the selection parameter from complex multi-dimensional evaluations to a single key parameter: the reception state of the random access preamble. By focusing antenna selection on this specific parameter (preamble reception quality), the system reduces selection complexity while still achieving reliable communication stability through diverse antenna options.
3Speed
If antenna selection is performed after connection establishment, then connection speed is improved, but communication quality may be compromised
Solution Approach 1:
The system performs the antenna evaluation action preliminarily during the random access preamble detection phase, which occurs before final connection establishment. By assessing antenna reception quality in this preliminary stage, the system ensures both fast connection establishment (since selection is already made) and high communication quality (since selection is based on actual reception measurements).
Solution Approach 2:
The random access preamble serves as an intermediary signal that enables the system to evaluate antenna performance without requiring full communication setup. This intermediary approach allows the system to gather necessary selection information quickly during the random access phase, balancing connection speed with communication quality by using the preamble as a proxy for channel quality assessment.
Data Source
AI summary
A control apparatus that is connected to a plurality of antennas and performs communication of user data with a terminal apparatus using at least one of the plurality of antennas, specifies a reception state of a random access preamble transmitted from the terminal apparatus for establishing connection with the control apparatus, at each of the plurality of antennas, selects an antenna to be used when performing communication of user data with the terminal apparatus, from the plurality of antennas based on the respective reception states at the plurality of antennas, and performs control such that communication of user data is performed with the terminal apparatus using the selected antenna.