Emergency Detection in Wireless Base Stations
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Solution Overview
Problem
Conventional wireless communication systems take too long to detect base station isolation during emergencies, such as disasters, due to the reliance on periodic keep-alive message transmission and reception, which can delay the detection of line disconnection between the base station and the core network.
Innovation Solution
A method and apparatus that detect emergencies by monitoring the number of emergency call signals received from mobile stations, triggering a handover command to mobile stations, allowing the base station to enter standalone mode and maintain communication, and reporting the emergency to the core network through neighboring base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic keep-alive message transmission and reception is used to detect base station isolation, then the detection method is simple and reliable, but the detection time is too long (55 seconds or more)
Solution Approach 1:
The system performs preliminary actions by having mobile stations continuously monitor emergency call signals and prepare emergency handover information before isolation actually occurs. When isolation is detected, the handover can be executed immediately using pre-prepared information, eliminating the need for lengthy detection procedures.
Solution Approach 2:
The patent introduces mobile stations as intermediaries that monitor emergency call signals and detect isolation conditions. Instead of relying solely on periodic keep-alive messages between base station and core network, the mobile stations act as intermediate detectors that can identify isolation conditions much faster by monitoring the absence of emergency call signals.
2Speed
If the number of emergency call signals is monitored to detect emergency, then the detection speed is rapid, but the system complexity increases
Solution Approach 1:
Mobile stations perform self-service by autonomously monitoring emergency call signals and detecting isolation conditions without requiring complex centralized monitoring infrastructure. Each mobile station independently counts emergency call signals and determines when isolation has occurred, simplifying the overall system architecture while achieving rapid detection.
Solution Approach 2:
The emergency call signal monitoring mechanism serves multiple functions: it detects isolation conditions, triggers emergency handover procedures, and provides a basis for determining when to switch to standalone mode. This multi-functionality reduces the need for separate detection systems, thereby limiting complexity increase despite the rapid detection capability.
3Duration of action of stationary object
If base station enters standalone mode to maintain communication, then communication continuity is preserved, but the ability to report to core network is lost
Solution Approach 1:
Before entering standalone mode, the base station performs preliminary actions by selecting a neighboring base station as a reporting target and preparing emergency information for later transmission. This preliminary preparation ensures that once in standalone mode, the base station can quickly restore reporting capability through the pre-selected neighboring base station without losing communication continuity.
Solution Approach 2:
The patent uses a neighboring base station as an intermediary to relay information between the isolated base station and the core network. When the base station enters standalone mode, it can still report emergency information to the core network indirectly through the neighboring base station, which forwards the information on behalf of the isolated base station, thus preserving both communication continuity and reporting capability.
Data Source
AI summary
A method and an apparatus handle an emergency in a wireless communication system. A method of a serving Base Station (BS) for detecting an emergency in a wireless communication system includes receiving an emergency call signal from Mobile Stations (MSs) in a cell; determining whether the number of the received emergency call signals exceeds a threshold number of times; when the number of the received emergency call signals exceeds the threshold number of times, detecting an emergency of a BS; and transmitting a message indicating the emergency to an MS in the cell.