Console Transmitter Identity Relay via Audio Frame Extraction
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Solution Overview
Problem
In wireless communication systems, particularly in public service environments, consoles lack the capability to provide transmitter identity during audio patching, leading to delays in identifying the transmitter, especially in conventional OTA PTT communications using the CAI P25 standard protocol, where the identity is not available until after the audio has begun to be patched, causing issues in Mission Critical situations.
Innovation Solution
A system and method where a console patches an audio stream and provides the transmitter identity to target devices by extracting and decoding the identity from control information embedded in the audio stream, minimizing audio delay and ensuring timely identification, even in scenarios with poor coverage or interference, by storing and decoding audio frames containing the transmitter identity before relaying the audio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the console patches audio stream immediately without waiting for transmitter identity extraction, then audio delay is minimized and real-time communication is maintained, but transmitter identity cannot be provided to receivers timely
Solution Approach 1:
The console extracts and decodes control information from audio frames in advance, before the audio patching is complete. By performing the identity extraction action preliminarily during the audio stream processing, the system ensures that transmitter identity is available immediately when needed, eliminating the delay between audio delivery and identity provision.
Solution Approach 2:
The console continuously processes audio frames and extracts control information throughout the audio patching operation. This continuous extraction and decoding process ensures that transmitter identity becomes available without interrupting the audio stream, maintaining both real-time communication and timely identity delivery.
2Measurement precision
If the console waits for transmitter identity to be extracted from audio frames before patching, then transmitter identity is provided accurately, but audio delay increases and real-time communication is compromised
Solution Approach 1:
The console performs transmitter identity extraction as a preliminary action during audio frame processing. By extracting control information from audio frames before finalizing the patch, the system ensures accurate identity delivery without waiting for the audio patching to complete, thus avoiding additional delay.
Solution Approach 2:
The console acts as an intermediary that processes audio frames and extracts control information including transmitter identity. This intermediary processing allows the system to obtain accurate transmitter identity data from the audio stream without requiring the audio patching to wait for identity extraction, thereby eliminating the trade-off between accuracy and delay.
3Loss of information
If control information is extracted from audio frames containing transmitter identity, then transmitter identity can be relayed to receivers, but audio processing complexity increases
Solution Approach 1:
The console extracts control information from audio frames that contain transmitter identity data. By taking out only the necessary control information (such as unit ID, unit name, and other identification data) from the audio stream, the system enables transmitter identity relay to receivers without processing the entire audio stream, thus reducing the complexity increase.
Solution Approach 2:
The console applies localized processing to specific portions of the audio stream where control information is embedded. Instead of processing the entire audio frame, the system focuses extraction operations on the specific control information segments containing transmitter identity, thereby minimizing the overall processing complexity while ensuring complete identity delivery.
Data Source
AI summary
A communication system, console, and method of patching a PTT call are provided. An audio stream and control messages are provided to the console, which patches the either or both to target devices. The identity of the audio stream source is embedded only in the audio stream. Initially, when the audio stream is first patched, the identity is not provided. While the audio stream is being patched, the identity is extracted and the control messages updated so that the identity is immediately relayed through the console without having to wait for the next periodic transmission of a control message from the console.