Mobile Device Camping Failure Tracking to Access Point

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Solution Overview

Problem

User equipment (UE) in wireless cellular radio systems experiences significant delays and potential voice call drops when transitioning from connected to idle mode, especially during radio link failures or circuit-switched fallback from LTE, due to inefficient cell selection processes on frequencies allocated for connected mode operations, leading to repeated failed camping attempts on barred frequencies.

Innovation Solution

A method where the UE marks failed camping frequencies with an indicium, or 'penalty,' to discourage future attempts, allowing it to prioritize unpenalized frequencies for camping, thereby accelerating cell selection and reducing delays.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE attempts to camp on cells on frequencies allocated for connected mode operations during idle mode transition, then the UE may find suitable cells for camping, but the UE experiences significant delays and repeated failed camping attempts on barred frequencies

Engineering Contradiction:

Improvecell camping successVSAvoidcell selection time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The network performs preliminary actions by providing frequency information to the UE before the mode transition occurs. The RRC connection release message includes a list of frequencies suitable for idle mode camping, allowing the UE to prepare and immediately camp on appropriate frequencies without trial-and-error attempts, thus resolving the contradiction between camping success and time delay

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The network provides feedback to the UE about which frequencies are appropriate for idle mode camping. By including frequency information in the RRC connection release message, the network guides the UE to select from pre-approved frequencies, preventing failed attempts on barred frequencies and reducing cell selection time while ensuring reliable camping

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If the UE repeatedly attempts to camp on barred frequencies during cell selection, then the UE exhausts all possible camping options, but this results in user-perceived voice call drops and increased battery consumption

Engineering Contradiction:

Improvecell selection optionsVSAvoidvoice call continuity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The network performs preliminary filtering of frequencies and provides only suitable frequencies to the UE in the RRC connection release message. This prevents the UE from attempting to camp on barred frequencies in the first place, ensuring voice call continuity and reducing battery consumption while maintaining adaptability through the provided frequency list

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent converts the potential harm of repeated failed camping attempts into benefit by having the network pre-identify and communicate suitable frequencies to the UE. This transforms what would be a harmful trial-and-error process into a beneficial guided selection process, improving voice call reliability and reducing energy consumption

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS9967814B2Automatic tracking of mobile device camping failure to an access point

Publication Date: 2018.05.08 MALIKIE INNOVATIONS LTD

AI summary

A method and apparatus for a device in which when an attempt on a frequency to camp on a cell fails, there is an indication stored in relation to the frequency of the failed camping attempt.