UE Cell Reselection Delay for Background Data Calls

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Solution Overview

Problem

In wireless communication networks, frequent transitions from idle to connected mode for short duration background data calls often interrupt cell reselection processes, preventing UEs from switching to better available networks, especially when the time-to-trigger timer expires or new measurement results are not available.

Innovation Solution

The UE delays background data call setup procedures when a suitable LTE cell is detected, allowing for immediate cell reselection to LTE even if the time-to-trigger timer has not expired, ensuring completion of cell reselection procedures before initiating the data call.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the UE immediately sets up background data calls in idle mode, then call setup speed is improved, but cell reselection procedures are interrupted and network quality deteriorates

Engineering Contradiction:

Improvecall setup speedVSAvoidcell reselection completion

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The system checks cell reselection conditions (signal quality thresholds and timer status) before initiating call setup procedures. This preliminary check prevents interruption of ongoing cell reselection processes while still enabling rapid call setup when conditions permit, thus resolving the contradiction between speed and reliability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The call setup procedure is dynamically adjusted based on real-time cell reselection status. When a cell reselection timer is running or signal quality indicates potential reselection, the system delays call setup temporarily. This dynamic adaptation allows the system to optimize both call setup speed and cell reselection completion based on current network conditions

Inventive Principle:

Principle #15Dynamics

2Reliability

If the UE delays call setup to complete cell reselection, then network quality is improved, but call setup time increases

Engineering Contradiction:

Improvenetwork qualityVSAvoidcall setup time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system applies partial delay only when necessary - specifically when cell reselection timers are running or signal quality thresholds suggest potential reselection. In most cases where cell reselection is not needed, call setup proceeds immediately without delay. This selective application minimizes time loss while ensuring network quality improvement when actually required

Inventive Principle:

Principle #16Partial or excessive action

3Adaptability or versatility

If the UE frequently transitions between idle and connected modes for background data calls, then data service availability is improved, but cell reselection processes are continuously interrupted

Engineering Contradiction:

Improvedata service availabilityVSAvoidcell reselection completion

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system incorporates feedback mechanisms by continuously monitoring cell reselection timer status and signal quality conditions before each call setup attempt. This feedback loop allows the UE to adapt its call setup behavior based on current cell reselection state, preventing interruptions while maintaining data service availability through coordinated idle/connected mode transitions

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS9374738B2Enhanced inter-radio access technology (IRAT) cell reselection

Publication Date: 2016.06.21 QUALCOMM INC

AI summary

A cell reselection technique establishes a data call on a different radio access technology (RAT) when a background application requests initiation of a data call while camped on a serving RAT. Rather than setting up the data call immediately on the serving RAT, a user equipment (UE) determines signal quality of the other RAT. When the signal quality is good, the UE delays call setup until after reselecting to the other RAT.