Active Standby Gateway Redundancy for PMIPv6 Failover
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Solution Overview
Problem
In Proxy Mobile Internet Protocol version 6 (PMIPv6) networks, the assumption of a single mobile access gateway (MAG) leads to time-consuming failover and underutilization of network resources due to inefficient MAG redundancy mechanisms.
Innovation Solution
Implementing a system where a local mobility anchor (LMA) selects a primary and secondary MAG based on gateway selection criteria, allowing the secondary MAG to operate in active standby mode, enabling near-immediate failover and efficient resource utilization by distributing mobility sessions between two MAGs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single MAG is assumed in PMIPv6 networks, then the network architecture is simple, but failover time increases and network resource utilization decreases
Solution Approach 1:
The patent implements preliminary action by pre-establishing IP tunnels between the LMA and both primary and secondary MAGs before failover occurs. The secondary MAG maintains standby bindings and receives session requests in advance, so that when failover is needed, the transition is immediate rather than requiring time-consuming setup procedures. This resolves the contradiction by preparing the redundancy infrastructure ahead of time, reducing failover time without significantly increasing operational complexity.
2Device complexity
If a single MAG is assumed in PMIPv6 networks, then the configuration is simple, but network resource utilization decreases
Solution Approach 1:
The system performs preliminary actions by pre-configuring both primary and secondary MAGs with binding information and establishing IP tunnels in advance. The secondary MAG maintains standby bindings and is pre-positioned to take over immediately when needed. This allows network resources (MAG capacity, IP tunnel bandwidth) to be actively utilized by both gateways simultaneously - the primary handling active sessions while the secondary prepares and can immediately assume sessions, thereby improving overall resource utilization without complex reconfiguration during operation.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining active standby bindings at the secondary MAG that are ready to be activated immediately. The secondary MAG continuously monitors and maintains its readiness state, receiving and processing session requests in standby mode. This continuous preparation ensures that network resources remain productively engaged rather than idle, as the secondary MAG is constantly ready to take over, improving overall resource utilization while keeping the architecture relatively simple.
3Reliability
If traditional MAG redundancy is implemented, then failover capability is provided, but the switch over process is time-consuming
Solution Approach 1:
The patent applies preliminary action by pre-establishing all necessary failover infrastructure before it is needed: IP tunnels between LMA and both MAGs are created in advance, bindings are pre-configured at both primary and secondary MAGs, and the secondary MAG is pre-positioned in a standby state with all necessary session information. When failover occurs, the switch is immediate because everything is already prepared - no tunnel setup, no binding creation, no configuration changes are needed during the actual failover event, thus eliminating time-consuming switchover processes while maintaining full failover capability.
Solution Approach 2:
The system implements beforehand cushioning by maintaining standby bindings and pre-established IP tunnels that act as a cushion or buffer ready to absorb the failover transition. The secondary MAG holds pre-prepared session bindings that can immediately take over when the primary fails, cushioning the transition and preventing service interruption. This pre-positioned cushioning mechanism ensures rapid failover without time-consuming reconfiguration, as the cushioning infrastructure is already in place and ready to activate instantly.
Data Source
AI summary
A local mobility anchor (LMA) connected to a network receives session requests sent by first and second gateways on behalf of a mobile node seeking to establish a mobility session with the network. The LMA selects, based on a gateway selection criterion, either a first or a second gateway as active for actively handling the mobility session and the other gateway as standby. The LMA commands the active gateway to actively handle the mobility session and to configure the mobile node to use the active gateway for the mobility session. The LMA commands the standby gateway to not configure the mobile node and to operate in active standby to handle a failover of the mobility session from the primary gateway. The LMA establishes with the active gateway a first IP tunnel to be used for the mobility session.