ETWS Paging Request Segmentation for 4-Second Warning Delivery
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Solution Overview
Problem
Existing methods for transmitting Earthquake Tsunami Warning System (ETWS) primary notifications in 3GPP GSM Edge radio access networks are unable to deliver messages within the required 4-second timeframe due to the infrequent transmission of Cell Broadcast Channel (CBCH) messages and potential message loss, which can lead to delayed user equipment reception.
Innovation Solution
The solution involves introducing a new Mobile Identity within paging request messages to indicate ETWS notifications, allowing primary notification information to be included in multiple paging request messages, and using a new control message format to segment and prioritize the transmission of ETWS primary notifications on packet channels, ensuring timely delivery by setting the Page Mode IE to 'Extended paging' and utilizing non-discontinuous reception modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ETWS primary notification is transmitted via Cell Broadcast Channel (CBCH) after paging group indication, then authentication and reliability are improved, but transmission time exceeds 4 seconds due to infrequent CBCH message transmission
Solution Approach 1:
The patent segments the ETWS notification transmission into two parts: (1) Paging Request messages with Mobile Identity indicating ETWS status to alert users immediately, and (2) CBCH messages for detailed notification content. This segmentation allows the critical alert to be delivered within 4 seconds while maintaining reliability through authentication in the detailed notification.
Solution Approach 2:
The patent uses preliminary action by sending Paging Request messages before the actual ETWS notification. These paging messages with Mobile Identity set to indicate ETWS status prepare the user equipment and alert users in advance, enabling the full notification to be delivered within the 4-second requirement while maintaining reliability.
2Speed
If CBCH messages are transmitted frequently to reduce transmission time, then transmission speed is improved, but message loss probability increases and system resources are consumed
Solution Approach 1:
The patent segments the notification function between Paging Request messages (for immediate alert) and CBCH messages (for detailed notification with authentication). This allows the system to maintain reliable message delivery without requiring frequent CBCH transmissions, as the critical alert is already delivered through the paging mechanism.
3Reliability
If authentication information is included in primary notification to prevent fake messages, then security is improved, but message size exceeds single CCCH control message capacity
Solution Approach 1:
The patent segments the notification content into Paging Request messages that indicate ETWS status (with authentication) and separate CBCH messages that carry the detailed notification content. This segmentation allows authentication information to be included without exceeding CCCH control message capacity, as only the critical alert and authentication data are placed in the paging message.
Solution Approach 2:
The patent transitions from a single-dimensional message structure to a multi-dimensional communication approach by using both Paging Request messages and CBCH messages. This dimensional expansion allows the system to convey authentication information and detailed notification content separately, avoiding the size limitation of single CCCH control messages.
Data Source
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AI summary
The present invention relates to a communication network node, a user equipment and methods in the communication network node and user equipment respectively for transmitting/receiving an earthquake and/or tsunami warning message over a radio interface in a communication network system comprising communication network nodes each serving at least one cell in which said user equipments are situated. The Earthquake Tsunami Warning System (ETWS) primary notification message is sent within paging request messages.