Terminal Camping via IMSI-Based ARFCN Table

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Solution Overview

Problem

In the Universal Mobile Telecommunications System (UMTS), terminals require extensive frequency scanning across all supported bands to locate a suitable Absolute Radio Frequency Channel Number (ARFCN) for camping, resulting in a lengthy process.

Innovation Solution

A terminal and control method that utilize an ARFCN table stored in a SIM card, based on International Mobile Subscriber Identity (IMSI) information, to selectively scan and camp on specific ARFCNs, reducing the need for comprehensive frequency scanning by using Mobile Country Code (MCC) and Mobile Network Code (MNC) information to identify suitable ARFCNs and perform camping.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If comprehensive frequency scanning across all bands is performed to locate a suitable ARFCN, then the terminal can ensure complete coverage of available frequency bands, but the scanning time and processing effort increase significantly

Engineering Contradiction:

Improveservice acquisition reliabilityVSAvoidcamping time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent stores ARFCN information in advance in the SIM card, organized by frequency bands. When the terminal needs to camp on a network, it retrieves the pre-stored ARFCN information corresponding to the current frequency band instead of performing comprehensive scanning, thus reducing camping time while ensuring reliable service acquisition

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent divides the frequency spectrum into multiple bands (e.g., Band I, Band II, Band IV) and stores ARFCN information specifically for each band in the SIM card. The terminal selects and uses only the ARFCN information corresponding to the current frequency band, avoiding unnecessary scanning of other bands while ensuring complete coverage of the relevant band

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If the terminal scans all frequency bands to ensure complete coverage, then no suitable ARFCN is missed, but the scanning complexity and processing load increase

Engineering Contradiction:

Improvefrequency band coverageVSAvoidscanning process complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the frequency spectrum into multiple bands and stores ARFCN information separately for each band in the SIM card. The terminal retrieves only the ARFCN information corresponding to the current frequency band, reducing scanning complexity while maintaining complete coverage adaptability across all supported bands

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces the SIM card as an intermediary that stores pre-configured ARFCN information for multiple frequency bands. The terminal uses this intermediary to obtain the appropriate ARFCN information without performing comprehensive scanning, thus reducing processing load while maintaining band coverage versatility

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS8295833B2Terminal performing camping based on IMSI information and control method thereof

Publication Date: 2012.10.23 SAMSUNG ELECTRONICS CO LTD

AI summary

A terminal and method are provided. The terminal includes an Absolute Radio Frequency Channel Number (ARFCN) table including at least one ARFCN information, and a controller for controlling a frequency scanning based on the ARFCN table to detect one or more ARFCNs from the ARFCN table and for controlling a camping on at least one of the detected one or more ARFCNs, such that the camping can be performed based on International Mobile Subscriber Identity (IMSI) information. The camping can be attempted without a scanning procedure for finding an available cell to reduce an amount of time for camping.