Reception Device Identifying Terminals via Orthogonal Identification Signals
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Solution Overview
Problem
In contention-based radio communication techniques, multiple terminal apparatuses sharing a frequency resource often experience data signal collisions, making it difficult for base stations to identify which terminal apparatus has performed data transmission, especially when the number of terminal apparatuses exceeds the number of receive antennas.
Innovation Solution
A communication method that allows the base station to identify terminal apparatuses using contention-based radio communication by employing identification signals and orthogonal resource allocation, reducing data transmission collisions and overhead through efficient resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple terminal apparatuses share a frequency resource in contention-based radio communication, then the proportion of control information overhead increases, but the ability to identify transmitting terminal apparatuses deteriorates
Solution Approach 1:
The frequency resource is segmented into multiple orthogonal resources (different frequencies, time slots, or code sequences). Each terminal apparatus is assigned a unique orthogonal resource for transmitting identification signals, which divides the identification problem into separable segments that can be independently detected without collision
Solution Approach 2:
An identification signal is introduced as an intermediary element between the data signal and the base station's identification process. This separate identification signal carries terminal-specific information in a structured format that facilitates reliable detection even when multiple terminals transmit simultaneously on the same frequency resource
2Productivity
If contention-based radio communication is used to reduce control information overhead, then data transmission efficiency improves, but data signal collisions increase
Solution Approach 1:
Terminal apparatuses perform preliminary actions by transmitting identification signals before or along with data signals. The base station uses these pre-transmitted identification signals to identify the transmitting terminal and prepare appropriate reception processing, enabling collision resolution before the actual data extraction process
Solution Approach 2:
The system implements feedback mechanisms where the base station detects identification signals, determines the transmitting terminal apparatus, and uses this information to adjust reception processing parameters. This feedback loop enables dynamic adaptation to collision scenarios and improves the reliability of data transmission in contention-based environments
Data Source
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AI summary
In a case of a contention-based radio communication technique, it is necessary to identify a terminal apparatus that has performed data transmission among terminal apparatuses sharing a frequency resource. There is a problem that it is difficult to identify the terminal apparatus that has performed data transmission in a case with a large number of terminal apparatuses that are non-orthogonally spatial multiplexed. Included are: a reception processing unit possible to perform first data reception of receiving a data signal transmitted without SR reception and control information of transmission permission and second data reception of receiving a data signal transmitted after SR reception or transmission of control information of transmission permission; an identification signal separator configured to separate an identification signal; a transmission terminal identification unit configured to identify the transmission device, based on the identification signal; a control information transmitting unit configured to transmit in advance a transmission parameter; and a reference signal separator configured to separate a DMRS. The transmission terminal identification unit identifies the transmission device, based on the identification signal only in the first data reception, and the reference signal separator separates the DMRS only in the second data reception.