Sub-group Communication in Direct Mode Operation
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Solution Overview
Problem
Current communication networks, such as TETRA, face issues where mobile stations receive unintended communications, leading to interference and blocking of intended communications within sub-groups, as all stations on a channel receive transmissions regardless of their intended recipients, causing interference and preventing sub-group communication efficiency.
Innovation Solution
The implementation of a mobile station system with a push-to-talk key and a controller that selectively adjusts transmission power levels based on the key's state, allowing for sub-group communication by distinguishing between network-wide and sub-group communications, and managing channel availability to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If mobile stations transmit communications on a shared channel without sub-group identification, then channel utilization is simplified, but interference and blocking increase as all stations receive all transmissions
Solution Approach 1:
The patent divides the communication channel into sub-channels by introducing sub-group identifiers. Mobile stations are organized into sub-groups, and each transmission includes a sub-group identifier that segments the audience. This allows the shared channel to function as multiple dedicated sub-channels simultaneously, reducing interference while maintaining channel utilization efficiency.
Solution Approach 2:
The patent applies local quality by making transmissions targeted to specific sub-groups through sub-group identifiers. Instead of uniform broadcasting to all stations, each transmission is customized with identifiers that match specific sub-groups. This allows different parts of the network (different sub-groups) to receive different content, reducing unwanted reception and interference for stations outside the target sub-group.
2Ease of operation
If mobile stations receive all communications on their channel regardless of intent, then reception simplicity is maintained, but communication efficiency decreases due to unwanted communications blocking intended ones
Solution Approach 1:
The patent implements preliminary action by having mobile stations pre-configured with sub-group identifiers before communication begins. Stations know in advance which sub-groups they belong to, allowing them to automatically filter and select only relevant transmissions without complex real-time processing. This pre-organization enables efficient reception while maintaining operational simplicity.
Solution Approach 2:
The patent employs feedback mechanisms where transmitting stations include sub-group identifiers in their transmissions, and receiving stations use this information to determine relevance. This feedback loop allows stations to efficiently identify and process only intended communications, improving productivity while maintaining simple reception operations through automatic filtering based on pre-established group identifiers.
3Speed
If transmit power is always set to maximum level, then communication range is maximized, but interference with other sub-groups increases
Solution Approach 1:
The patent applies dynamics by making transmit power adjustable rather than fixed at maximum. The system dynamically selects appropriate power levels based on the transmission distance and the presence of other sub-groups. This allows the system to optimize between communication range and interference reduction, adapting power settings to current operational conditions rather than using a static maximum power approach.
Solution Approach 2:
The patent implements parameter changes by varying the transmit power level as a controllable parameter. Instead of always operating at maximum power, the system changes the power parameter based on the specific communication scenario, sub-group identification, and distance factors. This parameter adjustment enables the system to achieve adequate communication range while minimizing interference to other sub-groups.
Data Source
AI summary
Sub-group communication during a direct mode of operation of mobile stations in a mobile communication network. A controller in a mobile station detects a request to transmit an outgoing communication and determines whether a push-to-talk key is in an activated state or in a deactivated state. The controller further selects a first power level when a determined state of the push-to-talk key is the activated state, and selects a second power level when the determined state of the push-to-talk key is the deactivated state. The controller also transmits, via the radio unit, the outgoing communication on a current operating channel to at least one other mobile station within a mobile communication network at the selected power level.