Emergency Broadcast Scheduling in Broadcast-Multicast Service
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Solution Overview
Problem
Existing emergency notification systems in wireless communication systems consume significant power, necessitating a method to efficiently deliver emergency broadcast information without excessive resource utilization.
Innovation Solution
The method involves scheduling emergency broadcast information in designated control channel cycles within a broadcast-multicast service, where subscriber stations periodically wake up to check for notifications, compute a short-term key, and decrypt the information when present, minimizing power consumption and system impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If subscriber stations continuously monitor for emergency notifications, then emergency notification reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic monitoring by having subscriber stations wake up at predetermined intervals to check for emergency notifications on the forward link, rather than continuously monitoring. This periodic action maintains emergency notification reliability while significantly reducing power consumption during idle periods.
Solution Approach 2:
The system performs preliminary action by scheduling and transmitting emergency notification information in advance on the forward link control channel, allowing subscriber stations to efficiently check for pre-prepared notifications during their wake periods without needing to continuously monitor for unscheduled transmissions.
2Reliability
If emergency broadcast information is transmitted to all subscriber stations, then emergency notification coverage is improved, but system capacity is degraded
Solution Approach 1:
The patent segments the subscriber station population into different groups, each assigned to specific forward link control channels. This segmentation allows emergency notifications to be efficiently targeted to specific groups rather than broadcasting to all stations, improving coverage for notified groups while preserving overall system capacity.
Solution Approach 2:
The forward link control channel is designed with multi-functionality, serving both regular control purposes and emergency notification transmission. This universal channel design allows the system to maintain full system capacity for regular operations while efficiently delivering emergency notifications to all subscriber stations through the same infrastructure.
Data Source
AI summary
Methods, apparatus and media for receiving emergency broadcast information in a broadcast-multicast service of a communication system. The methods, apparatus and media include scheduling a broadcast of emergency broadcast information in designated control channel cycles for designated subscriber stations. The control channel cycles are transmitted with the designated control channel cycles including the emergency broadcast information. Subscriber stations awake according to their designated control channel cycle and receive the transmission of their designated control channel cycle on a broadcast-multicast service. The subscriber station determines if emergency broadcast information is in the control channel cycle assigned to the subscriber station and responds accordingly.