Cellular Registration Frequency Adjustment for Access Probe Collisions

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Solution Overview

Problem

In cellular wireless communication systems, access probe collisions occur due to high usage during peak events, leading to unsuccessful registrations and impaired communication services, as multiple mobile stations attempting to register simultaneously overwhelm the air interface, causing collisions and retries.

Innovation Solution

Implement a method to dynamically adjust the radio frequency registration periods based on transmission-success rates and air interface load conditions, increasing registration frequency when success rates are low and load is below a threshold to ensure proper paging of mobile stations, thereby reducing collisions and overload.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple mobile stations attempt to register simultaneously during peak events, then the system handles high demand, but access probe collisions increase and registration success rate decreases

Engineering Contradiction:

Improvesystem capacity to handle registrationsVSAvoidregistration success rate

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements dynamic adjustment of registration parameters based on real-time system conditions. The base station monitors access probe collision rates and registration success rates, then dynamically modifies registration acceptance decisions. When collision rates exceed thresholds, the base station selectively rejects access probes from certain mobile stations to reduce overall collision probability and maintain system reliability during high-demand periods.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system continuously monitors registration outcomes including access probe collision rates and success rates. This feedback information is used by the base station to make real-time decisions about accepting or rejecting access probes. The feedback loop enables the system to adapt to changing traffic conditions and maintain optimal performance by adjusting registration acceptance based on observed collision patterns and success rates.

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If the base station accepts all access probes during high usage, then mobile stations can register, but air interface load increases causing overload and collisions

Engineering Contradiction:

Improvesystem ability to accommodate mobile stationsVSAvoidair interface overload and collisions

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the parameter of access probe acceptance from a static always-accept policy to a dynamic decision based on monitored system parameters. The base station measures access probe collision rates, registration success rates, and air interface load conditions. Based on these parameter measurements, the base station dynamically adjusts whether to accept or reject access probes, thereby changing the system's operational parameters to avoid overload while maintaining adaptability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The base station autonomously monitors system conditions and makes real-time decisions about access probe acceptance without external intervention. The system self-regulates by comparing measured collision rates and success rates against thresholds, then automatically adjusting its acceptance behavior. This self-service mechanism enables the base station to maintain optimal performance and prevent overload conditions through autonomous adaptive control.

Inventive Principle:

Principle #25Self-service

3Object-affected harmful factors

If the base station rejects access probes to reduce load, then air interface collisions decrease, but mobile station registration success rate decreases

Engineering Contradiction:

Improveair interface collision rateVSAvoidmobile station registration success

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

Instead of uniformly accepting or rejecting all access probes, the base station applies partial action by selectively accepting some access probes while rejecting others based on real-time conditions. The base station compares measured collision rates and success rates against thresholds and makes nuanced decisions about individual access probe acceptance. This partial action approach optimizes the balance between reducing collisions and maintaining registration success by applying rejection only when and where necessary.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS8290490B2Paging success rate mechanism

Publication Date: 2012.10.16 SPRINT SPECTRUM LLC

AI summary

A method for handling registration requests in a cellular wireless communication system. The method includes determining that a transmission-success rate of messages sent via the forward-link of an air interface is less than a threshold success rate. The method further includes, in response to the determination that the system has less than a threshold transmission success rate, increasing a frequency at which mobile stations register with the cellular wireless communication system via the air interface.