Mobile Station Adaptive Modulation Control After Handover

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Solution Overview

Problem

In the HSDPA system, during handover, the radio base station as the handover destination often fails to receive CQI information in a timely manner, leading to disruptions in adaptive modulation control, which is critical for maintaining high-speed data transmission.

Innovation Solution

The mobile station transmits CQI parameters in a timing that initially does not satisfy the predetermined conditions after channel switching due to handover, and then adjusts back to the predetermined timing, ensuring smooth adaptive modulation control and quick resumption of high-speed data transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the mobile station transmits CQI information only at predetermined timing after handover, then the transmission timing is standardized and easy to manage, but the radio base station as handover destination cannot receive CQI information in a timely manner, causing disruption in adaptive modulation control

Engineering Contradiction:

Improveadaptive modulation control continuityVSAvoidCQI information reception delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The mobile station transmits CQI information in advance at the first available timing after handover, even before the predetermined timing condition is met. This preliminary transmission ensures the radio base station receives CQI information immediately after handover, preventing disruption in adaptive modulation control while maintaining standardized timing management.

Inventive Principle:

Principle #10Preliminary action

2Loss of time

If the mobile station transmits CQI information at the first available timing after handover, then the radio base station receives CQI information quickly, but the transmission timing becomes irregular and deviates from predetermined conditions

Engineering Contradiction:

ImproveCQI information reception delayVSAvoidtransmission timing regularity

Core Design Contradiction:

Loss of timeVSStability of the object's composition

Solution Approach 1:

The mobile station dynamically adjusts transmission timing based on the handover state. After handover, it transmits CQI information at the first available timing (irregular timing) to ensure quick reception. Afterward, it returns to transmitting at predetermined intervals (regular timing), thus dynamically switching between irregular and regular timing to balance quick information delivery with standardized timing management.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The CQI information transmission process is segmented into two phases: an initial phase after handover where transmission occurs at the first available timing, and a subsequent phase where transmission follows predetermined intervals. This segmentation allows the system to prioritize quick CQI delivery immediately after handover while maintaining standardized timing for normal operation.

Inventive Principle:

Principle #1Segmentation

3Reliability

If the mobile station transmits CQI information frequently, then the adaptive modulation control is maintained continuously, but the transmission overhead increases

Engineering Contradiction:

Improveadaptive modulation control continuityVSAvoidtransmission overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The mobile station transmits CQI information periodically at predetermined intervals during normal operation, reducing transmission overhead while maintaining adaptive modulation control. After handover, it performs an additional transmission at the first available timing, ensuring continuous control without significantly increasing overall transmission overhead.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS7502597B2Radio base station, mobile station

Publication Date: 2009.03.10 FUJITSU LTD

AI summary

To realize smooth adaptive modulation control after handover even when the transmission frequency of parameters is lowered with transmission of the parameters used for the adaptive modulation control with timing satisfying predetermined conditions. As the mobile station for transmitting the parameters used for the adaptive modulation control in the timing satisfying the predetermined conditions, a mobile station comprises a transmitting unit for transmitting the parameters with the timing not satisfying the predetermined conditions.