Network Switching Fallback Configuration for Disaster Roaming
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently managing network switching operations, particularly during disasters or when networks become congested, leading to service interruptions and overload in other networks.
Innovation Solution
Implementing techniques that allow networks to broadcast availability messages, configure user equipment (UE) with fallback network lists and access identities, and dynamically adjust congestion management to prevent overload, such as switching between acceptance and rejection modes based on congestion thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a network broadcasts availability to accept non-subscriber UEs during a disaster, then service coverage is improved, but network congestion and overload occur
Solution Approach 1:
The patent applies local quality by configuring different access identities and priorities for different networks in the fallback configuration. Each network is assigned specific characteristics (access identity, priority level) that determine its local role in handling disaster inbound roamers. This allows the system to distribute load locally across multiple networks rather than concentrating all roaming UEs on a single available network.
Solution Approach 2:
The patent implements dynamics through the dynamic selection process where UEs continuously evaluate multiple available networks based on their fallback configuration and currently selected network status. The system dynamically adjusts network selection as networks become available or unavailable during the disaster, allowing flexible redistribution of load rather than static assignment.
2Ease of operation
If multiple UEs attempt to connect to the same available network simultaneously, then service accessibility is improved, but network congestion increases
Solution Approach 1:
The patent applies segmentation by dividing the population of disaster inbound roamers into different groups based on their calculated access identities. Each UE calculates its access identity using a hash function that distributes UEs across multiple networks. This segmentation prevents all UEs from simultaneously targeting the same network, thereby reducing congestion while maintaining accessibility.
Solution Approach 2:
The patent uses parameter changes by implementing a hash function that transforms UE identifiers into access identity parameters. This parameter transformation dynamically determines which network each UE should attempt to access, changing the network selection parameter based on UE characteristics rather than using a fixed assignment scheme.
3Stability of the object's composition
If a network rejects non-subscriber UEs to avoid overload, then network stability is improved, but service availability decreases
Solution Approach 1:
The patent applies preliminary action by pre-configuring UEs with a fallback configuration that includes multiple available networks and their associated parameters before the disaster occurs. This preliminary preparation ensures that when a disaster strikes and the home network becomes unavailable, UEs can immediately begin attempting to connect to alternative networks without delay, maintaining service availability while distributing load to preserve network stability.
Solution Approach 2:
The patent implements feedback through the network selection process where UEs monitor the status of available networks and adjust their selection based on current conditions. The system provides feedback mechanisms that allow UEs to determine which networks are currently accepting connections, enabling dynamic adaptation to network stability conditions while maintaining service availability.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment, UE, may identify (305) that the UE is not connected with a first network to which the UE subscribes, and identify a fallback configuration (310). The UE may determine (315), based on the fallback configuration, a second network of one or more other networks with which the UE is to connect. The UE may attempt (320) to connect with the second network based on the fallback configuration and the UE not being connected with the first network. In some cases, a base station of a network may establish a connection with UEs based on receiving registration messages from the UEs in response to transmitting an indication that the network is available as a fallback network, identify a congestion level of the network and switch to a non-subscriber rejection mode in which the base station rejects connection with non-subscriber UEs.