TETRA Speech Packet Multiplexing for Single Channel Transmission
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Solution Overview
Problem
Current TETRA mobile communications systems require multiple transmitters and receivers to support simultaneous speech and packet data transmission, which increases complexity, and using Voice-over-IP may not be practical due to end-to-end encryption limitations and compatibility issues with existing systems.
Innovation Solution
Encoding TETRA-encoded speech into data packets that can be transmitted on a TETRA channel, allowing simultaneous transmission of speech and data without the need for multiple transmitters and receivers, and enabling compatibility with standard TETRA communications stations through appropriate packaging and protocol management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple independent transmitters and receivers are used for simultaneous speech and packet data transmission, then simultaneous transmission capability is achieved, but device complexity increases
Solution Approach 1:
The patent combines speech transmission and packet data transmission into a single TETRA channel by multiplexing TETRA-encoded speech packets with other data packets. This merging approach eliminates the need for separate transmitters and receivers, thereby reducing device complexity while maintaining simultaneous transmission capability.
Solution Approach 2:
The TETRA channel is designed to perform multiple functions by carrying both speech packets and other data packets simultaneously. The channel structure is made universal to accommodate different types of traffic (speech and data) through packet multiplexing, allowing a single channel to serve multiple purposes without requiring dedicated separate channels.
2Device complexity
If Voice-over-IP is used for speech transmission on packet data channel, then single channel transmission is achieved, but compatibility with existing systems and end-to-end encryption are compromised
Solution Approach 1:
The patent changes the encoding parameter by using TETRA-encoded speech packets instead of VoIP-encoded speech packets. This parameter change maintains compatibility with existing TETRA systems and preserves end-to-end encryption capabilities while still allowing speech to be transmitted on the packet data channel alongside other data.
3Reliability
If TETRA-encoded speech is transmitted on circuit-mode voice channel, then speech quality is maintained, but simultaneous data transmission on the same channel is not possible
Solution Approach 1:
The patent segments the transmission medium by dividing the TETRA channel into multiple packets that can carry different types of content. Speech is segmented into TETRA-encoded speech packets that are multiplexed with other data packets on the same channel, allowing simultaneous transmission while maintaining speech quality through proper packet handling and prioritization.
Data Source
AI summary
In a TETRA mobile communications system, TETRA-encoded speech is packaged into TETRA data packets and the data packets containing the TETRA-encoded speech are then transmitted on a TETRA channel interspersed with data packets containing other data for transmission. This allows speech and packet data to be transmitted simultaneously on a single channel.