SMS-IWF Reassignment for Link Outage Recovery
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Solution Overview
Problem
In wireless communication networks, link failures between Mobility Management Entities (MME) and SMS Inter-Working Function (SMS-IWF) devices can lead to delayed or undelivered Short Message Service (SMS) messages for Machine-Type Communication (MTC) devices, as the network floods with paging requests when trying to reroute messages, causing resource utilization and performance issues.
Innovation Solution
Implementing a mechanism where the MME re-associates a UE device with a reachable SMS-IWF upon detecting a link failure, ensuring pending SMS messages are delivered through a tracking area update request, and configuring the MME to monitor and manage SMS-IWF device links to prevent such failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network floods with paging requests to reroute SMS messages when link failure occurs, then message delivery is attempted, but network resource utilization increases and performance deteriorates
Solution Approach 1:
The MME proactively monitors the status of SMS-IWF device links and detects link failures before they impact SMS message delivery. By performing preliminary detection and automatically reassigning UE devices to alternative SMS-IWF devices upon link failure, the system prevents the need for flooding the network with paging requests, thus maintaining reliable message delivery while conserving network resources
Solution Approach 2:
The MME continuously monitors link status between SMS-IWF devices and implements a feedback mechanism where link failure detection triggers automatic reassignment of UE devices to alternative SMS-IWF devices. This closed-loop feedback system ensures SMS messages are reliably delivered through functioning paths while avoiding unnecessary network-wide paging requests that would consume excessive resources
2Reliability
If the network floods with paging requests when link failure occurs, then message routing is attempted, but message delivery time increases
Solution Approach 1:
The MME performs preliminary monitoring of SMS-IWF device links and maintains awareness of link status and alternative routing options. When a link failure is detected, the MME has already identified alternative SMS-IWF devices, enabling immediate reassignment of UE devices and continuous SMS message delivery without the time-consuming process of flooding the network with paging requests to discover alternative routes
Solution Approach 2:
The continuous feedback mechanism allows the MME to detect link failures in real-time and trigger immediate reassignment of UE devices to alternative SMS-IWF devices. This rapid feedback response ensures that SMS messages are routed through functioning paths without significant delay, maintaining both delivery reliability and timely message transmission
3Reliability
If the MME monitors and manages SMS-IWF device links to prevent failures, then message delivery reliability improves, but system complexity increases
Solution Approach 1:
The MME implements self-service monitoring and automatic self-healing capabilities for SMS-IWF device links. The system autonomously detects link failures, identifies alternative SMS-IWF devices, and performs automatic reassignment of UE devices without requiring external intervention or complex manual management procedures. This self-service approach maintains high delivery reliability while keeping system management complexity manageable
Solution Approach 2:
The MME acts as an intermediary between SMS-IWF devices and UE devices, managing link monitoring and failure recovery in a centralized manner. By serving as the intermediary that coordinates link status monitoring and orchestrates automatic reassignments, the MME simplifies the overall system architecture while ensuring reliable SMS message delivery, avoiding the need for complex distributed management across multiple network elements
Data Source
AI summary
A computer device may include a memory configured to store instructions and a processor configured to execute the instructions to receive a service request from a user equipment (UE) device via a wireless access network; identify a Short Message Service Inter-Working Function (SMS-IWF) device associated with the UE device; and determine that the identified SMS-IWF device is associated with a link failure. The processor may further be configured to instruct the UE device to detach based on determining that the identified SMS-IWF device is associated with a link failure; receive a re-attach request from the UE device, in response to instructing the UE device to detach; and assign a functioning SMS-IWF device to the UE device, in response to receiving the re-attach request.