Mobile Station Handover Timing for Intermittent Communication

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Solution Overview

Problem

Conventional handover techniques in mobile communication systems require a longer delay and may fail due to the prolonged time needed to transition from an intermittent communication state to an active state during handovers in LTE systems, especially when the transition request is sent at intermittent transmission timings.

Innovation Solution

A method where the mobile station transmits a state transition request as L1 information using a common channel, such as a random access channel, at a timing different from the intermittent transmission timing, allowing for immediate transition to an active state and reducing the time required for the handover process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the mobile station transmits the state transition request at the next intermittent transmission timing, then the communication state can be changed from intermittent to active, but the handover delay time increases

Engineering Contradiction:

Improvehandover completion reliabilityVSAvoidhandover delay time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The mobile station transmits the state transition request immediately when handover is determined to be necessary, rather than waiting for the next intermittent transmission timing. This preliminary action initiates the state change from intermittent to active communication state earlier, reducing the overall handover delay time while ensuring reliable handover completion.

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If the communication state is changed to active state before handover, then the handover process can be executed, but the handover may not be complete within predetermined duration

Engineering Contradiction:

Improvehandover execution capabilityVSAvoidhandover completion duration

Core Design Contradiction:

Ease of operationVSDuration of action of moving object

Solution Approach 1:

The mobile station performs the state transition to active state immediately when handover is determined necessary, without waiting for the next intermittent transmission timing. This preliminary state change enables the handover process to start earlier and complete within the predetermined duration, while maintaining the ease of handover execution.

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If the mobile station waits for intermittent transmission timing to send state transition request, then the communication protocol is followed, but the power consumption increases due to prolonged active state

Engineering Contradiction:

Improveprotocol complianceVSAvoidmobile station power consumption

Core Design Contradiction:

Ease of manufactureVSUse of energy by moving object

Solution Approach 1:

The mobile station transmits the state transition request immediately when handover is determined necessary, rather than waiting for the next intermittent transmission timing. This preliminary action reduces the duration of the intermittent communication state and minimizes power consumption while still maintaining protocol compliance through proper signal transmission.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP2597928B1Discontinuous communication

Publication Date: 2016.05.18 FUJITSU LTD

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AI summary

In a method for an intermittent communication system where an intermittent communication can be made between a base station apparatus and a mobile station apparatus, the mobile station apparatus changes a period of the intermittent communication and transmits a signal in the changed period.