Mobile Wireless Device Connection State Synchronization

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Solution Overview

Problem

Mobile wireless devices with single chip technology face connection state misalignment issues when switching between LTE and CDMA 2000 1x networks, leading to interrupted data transfers and signaling message drops, which affect higher layer application performance.

Innovation Solution

A method for mobile wireless devices to detect connection state synchronization failures by analyzing paging messages and adjust their internal states to realign RRC connections, allowing them to release and re-establish connections with the wireless access network to maintain synchronized states.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a mobile wireless device with single chip technology switches between LTE and CDMA 2000 1x networks, then the device can access multiple wireless networks for service continuity, but connection state misalignment occurs causing data transfer interruption and signaling message drops

Engineering Contradiction:

Improveability to access multiple wireless networksVSAvoidconnection state synchronization

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The mobile device monitors downlink signaling messages from the LTE network and compares its internal RRC state with the network's expected state. When a mismatch is detected (e.g., device believes it's in RRC_CONNECTED while network expects RRC_IDLE), the device receives feedback through paging messages or system information and automatically triggers state realignment by releasing and re-establishing the RRC connection, ensuring continuous synchronization between device and network states

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

Before switching between networks, the device maintains registration on both LTE and CDMA 2000 1x networks simultaneously. When switching to CDMA 2000 1x, the device preliminarily preserves its LTE network registration state, allowing it to quickly detect and correct any connection state misalignment that occurs during the switch, preventing data transfer interruptions

Inventive Principle:

Principle #10Preliminary action

2Duration of action of stationary object

If the mobile device maintains continuous connection to the LTE network, then data transfer continuity is ensured, but the device cannot simultaneously monitor CDMA 2000 1x paging messages

Engineering Contradiction:

Improvedata transfer continuityVSAvoidability to monitor multiple networks

Core Design Contradiction:

Duration of action of stationary objectVSAdaptability or versatility

Solution Approach 1:

The device implements periodic monitoring of CDMA 2000 1x paging messages by temporarily suspending LTE data transfers at scheduled intervals. During these periodic monitoring windows, the device tunes to the CDMA 2000 1x network to check for paging messages, then resumes LTE data transfer. This periodic action ensures both data transfer continuity and the ability to monitor multiple networks

Inventive Principle:

Principle #19Periodic action

3Reliability

If the device releases and re-establishes RRC connection to realign states, then connection state synchronization is restored, but data transfer interruption occurs during the re-establishment process

Engineering Contradiction:

Improveconnection state synchronizationVSAvoiddata transfer interruption time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

Before releasing the RRC connection for state realignment, the device preliminarily buffers outgoing data and prepares uplink transmissions. The device also maintains downlink data buffering capabilities during the brief re-establishment process. This preliminary preparation minimizes data transfer interruption time by allowing quick resumption of data flows once the RRC connection is re-established

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The device rapidly executes the RRC connection release and re-establishment sequence by skipping non-essential procedures and using accelerated state transition mechanisms. The device rushes through the state realignment process in the minimum possible time, reducing the interruption duration to only what is absolutely necessary for state synchronization

Inventive Principle:

Principle #21Skipping (Rushing through)

Data Source

PatentUS8682283B2Adjusting connection states of a mobile wireless device

Publication Date: 2014.03.25 APPLE INC

AI summary

Methods, apparatuses and computer readable media are described that adjust connection states between a mobile wireless device and a wireless network upon detection of a connection state synchronization failure. After an interruption of a connection between the mobile wireless device and the wireless network, the mobile wireless device responds to a paging message received from the wireless network to establish a new radio resource control (RRC) connection or to re-establish an RRC connection with the wireless network, when an internal state of the mobile wireless device an at least a portion of contents of the paging message indicate the connection state synchronization failure.