Push-to-talk Terminal Automatic Transmission Priority
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Solution Overview
Problem
In mobile communications systems like TETRA, users are required to press and hold a Push-To-Talk (PTT) key to transmit, which is impractical in situations where hands-free operation is needed, such as driving or engaging in activities that prevent free-hand operation, and can lead to undesirable continuous transmission that excludes other users.
Innovation Solution
A communications terminal that can transmit without requiring the user to press or hold a PTT key, by receiving instructions to enter a mode where it automatically requests and maintains transmission on an allocated channel with a set priority, and automatically resumes transmission after interruptions, allowing other users with higher priority to take over the channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a user presses and holds a PTT key to transmit, then the user can maintain continuous transmission on the channel, but the user cannot operate hands-free and other users cannot access the channel
Solution Approach 1:
The terminal automatically requests and maintains transmission without requiring continuous user intervention. The system self-manages the transmission state by automatically requesting channel allocation and maintaining transmission until interrupted by higher priority traffic or user deactivation, enabling hands-free operation while allowing the system to serve itself.
Solution Approach 2:
The transmission mode is made dynamic by allowing automatic transmission that can be interrupted by higher priority users. The system transitions from static PTT-held state to a dynamic state where transmission automatically starts, maintains, and can be preempted, providing adaptability to changing communication needs.
2Productivity
If a terminal continuously transmits on an allocated channel, then hands-free transmission is enabled, but the channel is occupied and other users cannot access it
Solution Approach 1:
The system preemptively allows higher priority transmissions to interrupt the automatic transmission. By built-in priority handling mechanisms, the system prevents permanent channel occupation by low-priority automatic transmissions, ensuring that emergency or high-priority communications can always access the channel.
Solution Approach 2:
The transmission priority parameter is used to dynamically adjust channel access rights. The system changes the effective priority level based on incoming transmission requests, allowing automatic transmissions to be interrupted when higher priority needs arise, thus balancing continuous transmission with channel availability.
3Ease of operation
If automatic transmission is enabled without PTT key, then hands-free operation is achieved, but the system complexity increases due to automatic request and priority management
Solution Approach 1:
The automatic transmission feature leverages existing PTT logic and channel request mechanisms, making the existing system perform multiple functions. The same transmission request and priority handling infrastructure serves both traditional PTT operation and automatic transmission, reducing the need for separate complex subsystems.
Data Source
AI summary
A method of operating a communications terminal of a mobile communications system in which the terminal receives an instruction to enter a mode of operation in which the terminal will transmit without the need for the user to press or hold a key of the terminal. In response to receiving such an instruction, the terminal sends a request to transmit, together with an associated transmission priority setting, which when granted results in the terminal transmitting on the allocated channel without the need for the user to press or hold a key of the terminal. The terminal continues to transmit on this channel in this manner until either an instruction to stop is received, or another user requests to transmit on the same channel with a higher transmission priority setting.