Multi-Mode Mobile Station Paging Cycle Scaling

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Multi-mode mobile stations with a single RF chain face challenges in listening to paging intervals from both CDMA and WiMAX networks simultaneously due to potential collisions between their respective paging cycles, leading to missed messages and failed paging retries.

Innovation Solution

A method to determine a WiMAX paging cycle based on a scaling factor and offset value applied to the CDMA paging cycle, ensuring that WiMAX paging intervals do not conflict with CDMA intervals, allowing a multi-mode mobile station to listen to both networks without missing paging messages.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a multi-mode mobile station with a single RF chain listens to paging intervals from both CDMA and WiMAX networks simultaneously, then the mobile station can maintain connectivity to both networks, but paging message collisions occur between the two networks causing missed messages and failed paging retries

Engineering Contradiction:

Improvemulti-mode operationVSAvoidpaging message reception

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent changes the timing parameters of the WiMAX paging cycle by applying a scaling factor (e.g., 2x) and an offset value to the CDMA paging cycle. This parameter transformation shifts the WiMAX paging intervals to non-colliding time slots, allowing the single RF chain to successfully receive paging messages from both CDMA and WiMAX networks without interference.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If paging intervals from CDMA and WiMAX networks are aligned without scaling, then the mobile station can use a single RF chain, but consecutive collisions between paging intervals occur leading to missed messages

Engineering Contradiction:

ImproveRF chain configurationVSAvoidpaging retry success

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent performs preliminary calculation and configuration of the scaled WiMAX paging cycle parameters before the mobile station enters idle mode. By pre-determining the scaling factor and offset value, the system ensures that paging intervals are non-colliding from the outset, preventing missed messages and ensuring reliable paging retries without requiring complex runtime adjustments.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If the mobile station uses separate RF chains for CDMA and WiMAX networks, then paging messages from both networks can be received simultaneously, but device complexity and cost increase

Engineering Contradiction:

Improvepaging message receptionVSAvoidRF chain configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements periodic paging intervals with carefully coordinated periods for CDMA and WiMAX networks. By scaling the WiMAX paging cycle to be a multiple of the CDMA paging cycle and applying an offset, the system creates a periodic schedule where paging opportunities from both networks occur at different times, allowing a single RF chain to sequentially receive both without collision.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS8265661B2Methods and systems for idle mode operation in multi-mode mobile stations

Publication Date: 2012.09.11 QUALCOMM INC

AI summary

Certain embodiments of the present disclosure provide techniques for a multi-mode mobile station to establish paging intervals in different radio access technology (RAT) networks in an effort to avoid consecutive collisions between paging intervals of a first and a second network.