Mobile Station Emergency Information Reception via Triggered Scheduling

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Solution Overview

Problem

Conventional Earthquake and Tsunami Warning Systems (ETWS) and Public Warning Systems (PWS) face delays in notifying mobile stations of emergency information due to the need for radio base stations to wait until the next modification period starts, even after detecting emergency information, which hinders immediate transmission.

Innovation Solution

The method involves mobile stations receiving scheduling information at the current modification period upon detecting a predetermined trigger, allowing them to receive emergency information notifications without waiting for the next period, using a radio base station's scheduling-information-notification system information and emergency-information-notification system information via a broadcast channel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the radio base station transmits multiple types of system information repeatedly within a modification period, then the system information can be updated periodically, but the emergency information cannot be transmitted immediately and must wait until the next modification period starts

Engineering Contradiction:

Improvesystem information update reliabilityVSAvoidemergency information transmission delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent segments the system information transmission into two independent parts: (1) periodic transmission of multiple system information types (SIB1-SIB8) within modification periods, and (2) on-demand transmission of emergency information through trigger mechanisms. This segmentation allows the periodic update mechanism to maintain reliability while the emergency trigger mechanism eliminates transmission delays.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements preliminary action by having the radio base station prepare and notify mobile stations about emergency information transmission in advance. When emergency information is detected, the base station notifies mobile stations through the broadcast channel before the actual emergency information transmission, allowing mobile stations to prepare reception resources and ensuring immediate transmission without waiting for the next modification period.

Inventive Principle:

Principle #10Preliminary action

2Stability of the object's composition

If the radio base station waits until the next modification period starts to transmit emergency information, then the periodic transmission schedule is maintained, but the emergency notification speed is reduced

Engineering Contradiction:

Improvemodification period schedule stabilityVSAvoidemergency information notification speed

Core Design Contradiction:

Stability of the object's compositionVSSpeed

Solution Approach 1:

The patent applies dynamics by making the system flexible rather than rigid. While the periodic modification period schedule remains stable for normal operations, the emergency information transmission dynamically adapts to immediate needs. The trigger mechanism allows the system to switch from periodic mode to immediate mode when emergency information is detected, maintaining both schedule stability and notification speed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent introduces a trigger mechanism as an intermediary between the periodic transmission schedule and emergency information transmission. This intermediary (trigger) coordinates between the stable modification period schedule and the need for immediate emergency notification, allowing the base station to notify mobile stations about emergency information transmission without disrupting the periodic schedule or waiting for the next period to start.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Loss of information

If mobile stations receive system information continuously during the modification period, then information availability is improved, but the broadcast channel load increases

Engineering Contradiction:

Improvesystem information availabilityVSAvoidbroadcast channel load

Core Design Contradiction:

Loss of informationVSQuantity of substance

Solution Approach 1:

The patent applies partial action by having mobile stations receive only the necessary system information blocks (SIB1-SIB8) during periodic transmission, rather than continuously receiving all possible information. The trigger mechanism ensures that emergency information is transmitted only when needed, avoiding excessive broadcast channel load while maintaining information availability through selective reception based on triggers and periodic schedules.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS8849236B2Emergency-information receiving method, mobile station, and radio base station

Publication Date: 2014.09.30 NTT DOCOMO INC

AI summary

An emergency-information receiving method according to the present invention includes: starting, at mobile stations (UE), receiving scheduling-information-notification system information at a current modification period without waiting until a next modification period starts, when detecting a predetermined trigger; and receiving, at the mobile stations (UE), emergency-information-notification system information on the basis of scheduling information notified by the received scheduling-information-notification system information.