ETWS Paging Indication for Wireless Terminal Power Optimization
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Solution Overview
Problem
In conventional Cell Broadcast Service (CBS) schemes, terminals waste significant battery power by continuously monitoring channels for disaster warning messages, even when no message is being broadcast, leading to unnecessary power consumption.
Innovation Solution
A method where a terminal monitors a paging message for an indication of warning message broadcasting and only receives the warning message through a downlink shared channel when the message is present, using a primary and secondary notification approach to minimize power usage, with the base station retransmitting the message using Hybrid Automatic Repeat reQuest (HARQ) and indicating message completion to terminate reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal continuously monitors channels for disaster warning messages in conventional CBS schemes, then the terminal can receive warning messages reliably, but the terminal consumes excessive battery power
Solution Approach 1:
The terminal transitions from continuous channel monitoring to periodic monitoring by waking up at specific paging occasions to check for warning message indications. The terminal monitors paging messages periodically and only activates the downlink shared channel when a warning message indication is detected, converting continuous power consumption into periodic, event-driven power consumption.
Solution Approach 2:
A paging message indication serves as an intermediary signal between the network and the terminal. The network sends a paging message containing a warning message indication, which triggers the terminal to activate the downlink shared channel. This intermediary mechanism allows the terminal to remain in a low-power state until actually needed, resolving the contradiction between reliable reception and power consumption.
2Reliability
If a terminal activates the downlink shared channel continuously to receive warning messages, then complete warning messages can be received, but unnecessary power is consumed when no message is present
Solution Approach 1:
The downlink shared channel is activated periodically only when a paging message indication is detected, rather than continuously. The terminal checks the paging message at predetermined intervals and activates the resource-intensive downlink shared channel only when necessary, reducing energy loss while maintaining reception completeness.
Solution Approach 2:
The network performs a preliminary action by sending a paging message with a warning message indication before the actual warning message is transmitted. This allows the terminal to prepare and activate the downlink shared channel only when needed, avoiding unnecessary activation and energy consumption when no warning message is present.
3Reliability
If a terminal uses a primary and secondary notification approach with HARQ retransmission, then warning messages are received reliably even in poor channel conditions, but the message reception process becomes more complex
Solution Approach 1:
The warning message transmission is segmented into a primary notification phase and a secondary notification phase. The primary notification contains essential warning information, while the secondary notification provides additional details or retransmissions. This segmentation allows the terminal to receive critical information quickly while maintaining the option to receive complete information, managing complexity through structured phases.
Solution Approach 2:
Hybrid Automatic Repeat reQuest (HARQ) feedback mechanisms are employed where the terminal acknowledges receipt of warning messages and the network retransmits if necessary. This feedback loop ensures reliable reception in poor channel conditions by automatically requesting retransmissions, managing complexity through standardized feedback protocols.
Data Source
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AI summary
Disclosed is a method of receiving an Earthquake and Tsunami Warning System (ETWS) message for a wireless communication system. A user equiment (UE) monitors a paging message transmitted from a network in order to determine the presence of the ETWS message. If the monitored paging message has an indication of the ETWS message, the UE receives the ETWS message through a downlink shared channel (DL-SCH).