Wireless Relay Audio Retrieval for Simplex Group Calls
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Solution Overview
Problem
In simplex communication systems, it is difficult to confirm whether terminal apparatuses are connected, especially in group calls, and miscalls can occur due to varying reception quality and movement of terminal apparatuses within communication service areas.
Innovation Solution
A wireless relay apparatus that records and manages sound signals with identifiers, evaluates signal quality, and requests retransmissions when necessary, while transmitting a list of recorded identifiers to ensure accurate delivery to terminal apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If simplex communication is used for group calls, then communication coverage is improved, but connection confirmation becomes difficult
Solution Approach 1:
The system performs preliminary actions by having the transmitting terminal transmit its identifier before sound signal transmission, and having the relay apparatus store this identifier information in advance. This allows the receiving terminal to proactively request sound signals by transmitting the identifier, solving the connection confirmation problem in simplex group calls while maintaining wide communication coverage.
Solution Approach 2:
The relay apparatus acts as an intermediary between transmitting and receiving terminals. It stores identifier information from transmitting terminals and provides this information to receiving terminals upon request. This intermediary function enables connection confirmation and sound signal retrieval without requiring bidirectional communication, thus maintaining simplex operation benefits.
2Adaptability or versatility
If terminal apparatuses move within communication service areas, then communication flexibility is improved, but reception quality varies causing miscalls
Solution Approach 1:
The relay apparatus performs preliminary action by storing identifier information from transmitting terminals before sound signal transmission begins. When receiving terminals move into service areas and experience varying reception quality, they can request sound signals using the pre-stored identifier information, ensuring reliable retrieval even when real-time transmission quality fluctuates due to terminal movement.
3Speed
If sound signals are transmitted without confirmation, then transmission speed is improved, but miscalls occur due to unverified connections
Solution Approach 1:
The system performs preliminary verification by having transmitting terminals transmit their identifiers before actual sound signal transmission. The relay apparatus stores these identifiers in advance, allowing receiving terminals to verify connection validity by requesting and checking identifier information before receiving sound signals, thus preventing miscalls while maintaining efficient transmission.
Solution Approach 2:
The system implements feedback mechanism where receiving terminals can request identifier information from the relay apparatus to verify transmitting terminal identity before receiving sound signals. This feedback loop ensures call accuracy by allowing receiving terminals to confirm they are receiving signals from the intended transmitter, preventing miscalls while maintaining transmission speed.
Data Source
AI summary
When a second communication unit receives an identifier received last in time by a second terminal apparatus from the second terminal apparatus as a last identifier, a relay recording control unit causes the second communication unit to transmit a list of identifiers recorded in a recording unit after the last identifier to the second terminal apparatus, and that, when the second communication unit receives the identifier included in the list from the second terminal apparatus as a transmission request identifier, extracts a first sound signal corresponding to the transmission request identifier from the recording unit and causes the recording unit to transmit the first sound signal extracted to the second terminal apparatus as the second sound signal.