Home Agent Redundancy via Service Checkpoint Messages
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Solution Overview
Problem
Wireless mobile data networks lack redundancy in Home Agent services, leading to potential service disruptions if a Home Agent fails, as they were primarily designed for voice communications and lack mechanisms for seamless switchover in case of failures.
Innovation Solution
Implementing a redundant Home Agent system where a primary Home Agent can initiate a switchover to a secondary Home Agent through Hello Messages and Service Checkpoint Messages, ensuring continuous service by maintaining communication and synchronizing subscriber sessions, even in case of network or software failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single Home Agent is used to service packet data communications, then the system is simpler to manage and operate, but the system lacks redundancy and may experience service disruptions if the Home Agent fails
Solution Approach 1:
The patent implements preliminary action by pre-configuring a secondary Home Agent with all necessary system attributes and subscriber session information before any failure occurs. The secondary Home Agent is kept in standby mode with synchronized data, ready to immediately take over if the primary Home Agent fails, thus ensuring service continuity without requiring complex real-time failover mechanisms
Solution Approach 2:
The patent applies copying by creating a redundant copy of the Home Agent system. The secondary Home Agent is essentially a copy of the primary Home Agent with identical system attributes and subscriber session information. This copy can immediately replace the primary Home Agent in case of failure, providing reliability without significantly increasing operational complexity
2Reliability
If redundancy is implemented with multiple Home Agents, then service continuity is improved, but the system requires complex communication protocols and message exchanges
Solution Approach 1:
The patent extracts the essential failover mechanism from complex distributed system protocols. Instead of implementing full distributed consensus protocols, it extracts only the necessary elements: Hello Messages for liveness detection and Service Checkpoint Messages for state synchronization. This simplified approach provides redundancy while avoiding the complexity of full distributed system protocols
Solution Approach 2:
The patent implements feedback through periodic Hello Messages exchanged between primary and secondary Home Agents. The secondary Home Agent monitors the primary by receiving these feedback messages, and can detect failure when messages stop arriving. This simple feedback mechanism enables automatic failover without complex monitoring infrastructure
3Reliability
If a secondary Home Agent is maintained in standby mode, then seamless switchover is enabled, but system resources are consumed by the standby agent
Solution Approach 1:
The patent applies partial action by having the secondary Home Agent maintain only the essential components needed for failover: system attributes and subscriber session information. Rather than running full Home Agent services continuously, the standby agent maintains minimal state and can activate fully only when needed, thus reducing resource consumption while preserving failover capability
Data Source
AI summary
Methods and systems for providing redundancy in servicing packet data communications within wireless mobile data networks are disclosed. More particularly, the method and system provide a redundant Home Agent with the ability to assume the role of the primary Home Agent in the event of a primary Home Agent network, software, or other failure. The redundancy allows the Home Agent services to remain functional even in the event of a failure of one of the Home Agents in the redundant group, which may be composed of one or more Home Agents. The Home Agents can use a service redundancy protocol which is composed of messages that are sent between the redundant group of Home Agents. The messages allow the Home Agents to, for example, back up call session information, check on the status of one another, and share priority information.