Hysteresis Timer for Access Terminal Pre-Registration

Solution Overview

Problem

Wireless access terminals face significant power consumption issues due to frequent pre-registration attempts when switching between different communication networks, which can lead to battery drainage and resource wastage.

Innovation Solution

Implementing a hysteresis timer in access terminals to restrict pre-registration attempts and utilizing pre-registration zones and secondary pre-registration zone lists to determine when pre-registration is necessary, thereby conserving power and reducing unnecessary attempts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the access terminal performs frequent pre-registration attempts when switching between communication networks, then the network handoff reliability is improved, but the power consumption increases significantly

Engineering Contradiction:

Improvenetwork handoff reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements a hysteresis timer that creates periodic action by preventing pre-registration attempts during a restricted time window after a successful pre-registration. The timer forces a waiting period before another pre-registration can be attempted, transforming continuous frequent attempts into controlled periodic actions spaced by the timer duration. This resolves the contradiction by maintaining necessary pre-registration reliability while eliminating excessive power-consuming attempts during the hysteresis period.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent applies preliminary action by performing pre-registration in advance when the terminal is still connected to the first network, before actually needing to handoff to the second network. This preliminary pre-registration establishes network access ahead of time, so that when handoff is needed, the terminal can quickly re-use the pre-established connection rather than performing repeated pre-registration attempts, thereby reducing power consumption while ensuring reliable network access.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If the access terminal implements dual mode or multi mode capabilities to switch between different communication networks, then the adaptability is improved, but the device complexity increases

Engineering Contradiction:

Improvenetwork switching capabilityVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies dynamics by implementing a dynamic hysteresis timer mechanism that adapts its behavior based on the terminal's pre-registration state and current network conditions. The timer is started after successful pre-registration and dynamically prevents further attempts during its runtime, while allowing abort conditions to reset it. This dynamic control simplifies the management of multi-mode capabilities by providing automated, state-dependent regulation of pre-registration behavior, reducing the complexity of managing network switching across different communication standards.

Inventive Principle:

Principle #15Dynamics

3Speed

If the access terminal allows pre-registration attempts without restriction, then the network access speed is improved, but the loss of energy increases

Engineering Contradiction:

Improvenetwork access speedVSAvoidenergy loss

Core Design Contradiction:

SpeedVSLoss of energy

Solution Approach 1:

The patent applies preliminary action by performing pre-registration in advance when the terminal is still connected to the first network, before actually needing to handoff to the second network. This preliminary pre-registration establishes network access ahead of time, so that when handoff is needed, the terminal can quickly re-use the pre-established connection rather than performing repeated pre-registration attempts, thereby reducing power consumption while ensuring reliable network access.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements a hysteresis timer that creates periodic action by preventing pre-registration attempts during a restricted time window after a successful pre-registration. The timer forces a waiting period before another pre-registration can be attempted, transforming continuous frequent attempts into controlled periodic actions spaced by the timer duration. This resolves the contradiction by maintaining necessary pre-registration reliability while eliminating excessive power-consuming attempts during the hysteresis period.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS9883477B2Method and apparatus for reducing successive pre-registration attempts by access terminals

Publication Date: 2018.01.30 QUALCOMM INC

AI summary

An access terminal pre-registers with a second access network via a first access network to ensure a quick handover in the future. Frequent pre-registration attempts are avoided by implementing a hysteresis timer that restricts when a pre-registration process can be initiated. The hysteresis timer is started when pre-registration is initiated by the access terminal. No new pre-registration attempts are permitted if the hysteresis timer has not expired. An abort condition can cause the hysteresis timer to be aborted early, and a new pre-registration can be initiated. Access points in the first access network may be grouped into one or more pre-registration zones. If the access terminal moves from a first access point to a second access point, a new pre-registration is skipped if the first and second access points have the same pre-registration zone or the second access point is aware of the pre-registration zone for the first access point.