Wireless Relay Audio Retransmission Using Identifier Lists
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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 communication service areas, making reliable signal transmission challenging.
Innovation Solution
A wireless relay apparatus that records and manages sound signals with identifiers, evaluates signal quality, and facilitates retransmission when necessary, while providing 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 area is expanded, but reliability of connection confirmation deteriorates
Solution Approach 1:
The transmitting terminal apparatus transmits sound signals together with identification information in advance, and the relay apparatus stores these signals. When a receiving terminal enters the service area, it can immediately request and receive the stored sound signals without needing real-time connection confirmation, thus resolving the contradiction between expanded coverage and reliable connection confirmation.
Solution Approach 2:
A relay apparatus is introduced as an intermediary between transmitting and receiving terminal apparatuses. The relay apparatus stores sound signals and their identification information, managing the distribution to receiving terminals. This intermediary enables reliable connection confirmation and signal delivery across expanded geographic areas where direct terminal-to-terminal communication would be unreliable.
2Speed
If sound signals are transmitted without storage, then communication speed is maintained, but accuracy of signal delivery deteriorates
Solution Approach 1:
Sound signals and their identification information are stored in advance at the relay apparatus before being requested by receiving terminals. This preliminary storage ensures that when terminals connect, accurate signals are immediately available for transmission without delay, maintaining communication speed while ensuring delivery accuracy through pre-verified signal storage.
3Device complexity
If retransmission control is not implemented, then device complexity is reduced, but reliability of communication deteriorates
Solution Approach 1:
The system implements feedback through identification information that links transmitting, relay, and receiving terminal apparatuses. When sound signals are transmitted, the receiving terminal can request retransmission by referencing the stored identification information if signals are not properly received, providing reliable communication control without excessive complexity.
4Loss of information
If all sound signals are transmitted to all terminals, then completeness of information is improved, but loss of time increases
Solution Approach 1:
Sound signals are stored in advance at the relay apparatus with their identification information. When a receiving terminal enters the service area, it requests only the specific sound signals it needs by referencing the identification information, rather than receiving all transmitted signals. This ensures information completeness while minimizing transmission time through targeted retrieval.
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
When a second communication unit 214 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 254 causes the second communication unit 214 to transmit a list of identifiers recorded in a recording unit 260 after the last identifier to the second terminal apparatus, and that, when the second communication unit 214 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 260 and causes the recording unit 260 to transmit the first sound signal extracted to the second terminal apparatus as the second sound signal.