Mobile Station Cell Search Threshold Adjustment

Solution Overview

Problem

Existing communication methods for mobile stations face challenges in reducing processing time and power consumption during cell searches, particularly when frequency bands change or when noise and weak interfering waves are detected, leading to unnecessary synchronization processes.

Innovation Solution

A mobile station apparatus with a detection threshold changing unit that adjusts detection thresholds based on use environment information, a channel selecting unit that selects channels with higher reception levels, and a synchronization processing unit that performs synchronization only on selected channels, thereby reducing the number of channels subjected to synchronization processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional cell search is performed on all receivable channels, then the mobile station apparatus can discover available base stations, but the processing time and power consumption increase significantly

Engineering Contradiction:

Improvecell search completenessVSAvoidcell search time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by measuring reception strengths of all channels before performing synchronization processes. This preliminary measurement allows the system to identify and prioritize channels with higher reception strengths, thereby avoiding unnecessary synchronization processes on channels with poor reception. The measurement step is performed in advance to guide subsequent selective synchronization, reducing overall processing time while maintaining reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements partial action by performing synchronization processes only on channels whose reception strength exceeds a predetermined threshold, rather than on all receivable channels. This selective approach reduces the number of synchronization operations needed, directly decreasing processing time and power consumption while still ensuring that viable base stations are discovered.

Inventive Principle:

Principle #16Partial or excessive action

2Reliability

If a conventional cell search is performed on all receivable channels, then the mobile station apparatus can discover available base stations, but the power consumption increases significantly

Engineering Contradiction:

Improvecell search completenessVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies preliminary action by measuring reception strengths of all channels before performing synchronization processes. This preliminary measurement allows the system to identify and prioritize channels with higher reception strengths, thereby avoiding unnecessary synchronization processes on channels with poor reception. The measurement step is performed in advance to guide subsequent selective synchronization, reducing overall processing time and power consumption.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements partial action by performing synchronization processes only on channels whose reception strength exceeds a predetermined threshold, rather than on all receivable channels. This selective approach reduces the number of synchronization operations needed, directly decreasing power consumption while still ensuring that viable base stations are discovered.

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If the detection threshold is set low to detect weak signals, then more channels are detected, but unnecessary synchronization processes are performed on noise and weak interfering waves

Engineering Contradiction:

Improvesignal detection sensitivityVSAvoidsynchronization process efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies preliminary action by measuring reception strengths of all channels before performing synchronization processes. This preliminary measurement allows the system to identify and prioritize channels with higher reception strengths, thereby avoiding unnecessary synchronization processes on channels with poor reception. The measurement step is performed in advance to guide subsequent selective synchronization, reducing overall processing time while maintaining reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements partial action by performing synchronization processes only on channels whose reception strength exceeds a predetermined threshold, rather than on all receivable channels. This selective approach reduces the number of synchronization operations needed, directly decreasing processing time and power consumption while still ensuring that viable base stations are discovered.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS9585086B2Mobile station device for reducing processing time and power consumption related to a cell search

Publication Date: 2017.02.28 SHARP KK

AI summary

A detection threshold changing unit changes a detection threshold used for detecting a reception wave from a base station apparatus, on the basis of use environment information that represents a use environment of a mobile station apparatus. A channel selecting unit selects a channel having a reception level higher than the detection threshold from among channels that constitute the reception wave. A synchronization processing unit performs a synchronization process on a reception wave of the channel selected by the channel selecting unit. In this way, the processing time and power consumption related to a cell search is reduced.