Radio Controller Emergency Notification Channel Segmentation
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Solution Overview
Problem
In trunked radio access networks, it is challenging to reliably transmit emergency notifications to all group members and receive acknowledgments due to interference and collisions when members attempt to acknowledge the message simultaneously.
Innovation Solution
A method and apparatus that involve a radio controller identifying active channels for each base station serving the target group and broadcasting an emergency notification signaling packet requesting individual acknowledgment, allowing each subscriber device to transmit its acknowledgment within a specified window of time to avoid simultaneous transmissions and collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If all group members transmit acknowledgments simultaneously, then acknowledgment response time is reduced, but interference and collisions increase causing unreliable transmission
Solution Approach 1:
The patent segments the acknowledgment transmission process by dividing the total acknowledgment window into multiple time slots assigned to different group members. Each member is allocated a specific time slot, preventing simultaneous transmissions and eliminating collisions while ensuring all members can acknowledge within a controlled time framework.
Solution Approach 2:
The system performs preliminary action by pre-assigning time slots to each group member before the emergency notification is sent. This pre-scheduling of acknowledgment times prevents interference and collisions during the actual acknowledgment phase, ensuring reliable transmission without requiring simultaneous responses.
2Reliability
If a time window for acknowledgments is provided, then transmission reliability is improved by avoiding collisions, but acknowledgment processing time increases
Solution Approach 1:
The acknowledgment time window is segmented into discrete time slots, each assigned to a specific group member. This segmentation allows the system to maintain reliability by preventing collisions while controlling the total processing time through structured, sequential acknowledgment collection rather than unstructured simultaneous responses.
Solution Approach 2:
The system implements periodic action by establishing a repeating cycle where each group member transmits their acknowledgment in a predetermined periodic sequence. This periodic structure ensures reliable transmission through controlled timing while managing processing time through regular, predictable acknowledgment intervals rather than continuous monitoring.
3Reliability
If emergency notifications are broadcast on all active channels, then notification delivery is improved, but system complexity increases
Solution Approach 1:
The patent applies universality by enabling the emergency notification system to operate across multiple active channels simultaneously, ensuring comprehensive coverage of all group members regardless of which channel they are currently using. The system universally broadcasts on all active channels rather than being channel-specific, maximizing delivery reliability.
Solution Approach 2:
The system performs preliminary identification of all active channels before broadcasting the emergency notification. By pre-determining which channels are active and assigning appropriate time slots for each channel, the system simplifies the broadcasting process and avoids the complexity of real-time channel selection and coordination.
Data Source
AI summary
Group-based emergency notifications and acknowledgments are managed via a radio controller. A request to transmit an emergency notification with acknowledgment to an identified target group of subscriber devices is received at the radio controller from a requesting device. The radio controller identifies one or more base stations actively serving subscriber devices associated with the identified target group and identifies, for each of the identified one or more base stations, active channels including one or more of a control channel associated with the base station and active voice or data channels associated with the base station. The radio controller causes an emergency notification outbound signaling packet (OSP), requesting individual acknowledgment and identifying the target group of subscriber devices, to be broadcast on the identified active channels at the identified one or more base stations. Acknowledgments are forwarded back to one of the requesting device and a dispatch console.