Multi-mode Device Network Coordination for Data Session Preservation
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Solution Overview
Problem
Dual-mode handsets face issues with dormant-to-active data transitions between CDMA and iDEN networks, leading to data loss due to simultaneous network engagement restrictions and power control limitations.
Innovation Solution
A method for managing communications in multi-mode devices involves advising the first wireless network of the device's multi-mode nature, allowing it to switch from a first dormant-to-active transition mode to a second mode that maintains data sessions and re-attempts transitions, even if the device is engaged in a dispatch call on another network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the handset ignores the CDMA page request while engaged in a dispatch call on iDEN, then the SAR guidelines are met and simultaneous transmission is avoided, but the data session cannot be re-established and data is lost
Solution Approach 1:
The handset proactively sends a message to the CDMA network indicating its multi-mode nature and current engagement in another network before the data session transition is attempted. This preliminary notification allows the network to adjust its behavior and avoid subsequent conflicts, preventing data loss while maintaining SAR compliance.
Solution Approach 2:
The system implements a feedback mechanism where the handset informs the CDMA network of its current state (engaged in dispatch call on iDEN). This feedback loop enables the network to make informed decisions about data session management, switching to a second dormant-to-active transition mode that accommodates the handset's constraints while preserving data integrity.
2Productivity
If the CDMA network continues to transmit page requests, then it attempts to re-establish the data session, but the handset continues to ignore requests and the PPP connection is torn down resulting in data loss
Solution Approach 1:
The feedback message from the handset to the CDMA network provides real-time information about the device's engagement status. This feedback enables the network to understand that continued page requests will be ignored and to take appropriate actions such as maintaining the data session in dormant state or using alternative re-establishment strategies, thereby preventing data loss.
Solution Approach 2:
By notifying the network in advance of the engagement status, the handset enables the network to take preliminary actions to preserve the data session or prepare alternative re-establishment methods before data loss can occur. This proactive approach prevents the PPP connection from being torn down unnecessarily.
3Adaptability or versatility
If the handset is camped on both CDMA and iDEN networks, then multi-network capability is utilized, but the handset cannot engage in active communications on two networks simultaneously due to power control constraints
Solution Approach 1:
The handset sends a preliminary message to the CDMA network indicating its multi-mode nature and current engagement status before the network attempts to activate a data session. This advance notification allows the network to coordinate its actions with the handset's current state, enabling seamless multi-network operation without requiring simultaneous active communications.
Solution Approach 2:
The message exchange acts as an intermediary mechanism that coordinates between the handset and CDMA network. This intermediary communication allows the network to understand the handset's constraints and adjust its data session management accordingly, enabling the handset to maintain multi-network capability while adhering to power control limitations.
Data Source
AI summary
The invention concerns a method (200) and system (100) for managing communications for a multi-mode communications device (130). The method can include the steps of establishing (210) communications with at least a first wireless network (110) and advising (216) the first wireless network of the multi-mode nature of the multi-mode communications device. As such, the first wireless network can be made aware that the multi-mode communications device is capable of communicating with a second wireless network (120).