Wireless Device Call Setup Integrity During RAT Transfer

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Solution Overview

Problem

Wireless communication devices face challenges in maintaining connection establishment during call setup procedures, particularly when transferring between different radio access technologies (RATs), which can lead to interrupted calls and reduced success rates in circuit-switched fallback (CSFB) scenarios.

Innovation Solution

The device refrains from transferring to a second RAT, such as LTE, until the connection establishment procedure on the first RAT, like WCDMA, is completed, even if transfer criteria are met, to ensure successful call completion and improve key performance indicators (KPIs).

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the device transfers to a second RAT when transfer criteria are met, then the device can access better network coverage or faster data rates, but the connection establishment procedure may be interrupted and call setup may fail

Engineering Contradiction:

Improvedata rateVSAvoidcall setup success rate

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The device checks whether a connection establishment procedure is currently being performed before executing the RAT transfer. This preliminary check prevents interruption of ongoing call setup procedures, ensuring that the transfer only occurs when it is safe to do so, thus maintaining call setup success rate while still enabling access to better network conditions

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the device refrains from transferring to a second RAT during connection establishment, then call setup success rate is improved, but network access speed and responsiveness are reduced

Engineering Contradiction:

Improvecall setup success rateVSAvoidcall setup delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The device dynamically adjusts its transfer behavior based on the current operational state. When a connection establishment procedure is detected, the device temporarily suspends transfer operations to ensure success. When no such procedure is ongoing, the device readily performs transfers when criteria are met. This dynamic state-dependent behavior resolves the contradiction by being restrictive only when necessary

Inventive Principle:

Principle #15Dynamics

3Productivity

If the device monitors transfer criteria continuously, then the device can quickly respond to network conditions, but unnecessary signaling and power consumption increase

Engineering Contradiction:

Improveresponse speedVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The device leverages existing network signaling and internal state information to determine whether a connection establishment procedure is ongoing. Rather than continuously monitoring for this condition, the device uses available self-information and existing protocol exchanges to make informed decisions, reducing unnecessary monitoring while maintaining responsive behavior

Inventive Principle:

Principle #25Self-service

Data Source

PatentEP3369270B1Techniques and apparatuses for improved cell transfer during call setup procedure

Publication Date: 2019.09.04 QUALCOMM INC

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AI summary

Certain aspects of the present disclosure generally relate to wireless communications. In some aspects, a wireless communication device may determine, in a particular state, that a wireless communication device is performing a connection establishment procedure. The wireless communication device may refrain from transferring from a first radio access technology (RAT) to a second RAT until completing the connection establishment procedure. The second RAT may satisfy a set of transfer criteria associated with performing a transfer from the first RAT to the second RAT.