MME Paging Status Feedback for CS Fallback Call Reliability
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Solution Overview
Problem
In the CS fallback solution, users face delays in confirming voice calls due to manual interaction, leading to increased waiting times for MSCs, which can result in mistaken call failures and termination, affecting voice service quality.
Innovation Solution
The method involves the MME sending a paging notification message to the UE and returning a called-UE paging status message to the MSC, indicating receipt of the notification without waiting for a service request, thereby improving the success ratio of paging operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MSC waits for user confirmation of CS fallback operation, then the user can make an informed decision about interrupting data service, but the waiting time exceeds 10 seconds causing the MSC to mistakenly believe paging failed
Solution Approach 1:
The MME sends a paging status message to the MSC in advance, indicating that the UE has received the paging notification and is processing it. This preliminary action allows the MSC to know that paging is in progress before the user confirmation is complete, preventing the MSC from mistakenly timing out and terminating the call prematurely.
Solution Approach 2:
The system introduces a feedback mechanism where the MME continuously updates the MSC about the paging status. The paging status message provides real-time feedback to the MSC, allowing it to adjust its waiting behavior based on the actual state of the UE, thereby resolving the contradiction between waiting for user confirmation and avoiding false timeout errors.
2Productivity
If the MSC terminates the call after long waiting time, then the system avoids indefinite waiting, but it causes incorrect call termination when the UE is actually processing the paging notification
Solution Approach 1:
The paging status message serves as a feedback mechanism that informs the MSC whether the UE has successfully received and is processing the paging notification. This feedback allows the MSC to distinguish between genuine paging failures and normal processing delays, preventing incorrect call termination while maintaining efficient call setup.
Solution Approach 2:
By sending the paging status message before the user confirmation is complete, the system performs a preliminary action that prevents the MSC from making hasty termination decisions. This ensures that call termination only occurs when truly necessary, improving call completion accuracy without significantly impacting call setup efficiency.
3Reliability
If the calling party waits for ring back tone, then they know the call is being processed, but the long waiting time causes them to terminate the call actively
Solution Approach 1:
The MME sends the paging status message to the MSC in advance, enabling the MSC to provide earlier feedback to the calling party about call processing status. This preliminary information allows the calling party to understand that the call is being handled, reducing unnecessary call terminations while maintaining reasonable waiting times.
Data Source
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AI summary
A method, an apparatus, and a system for paging processing and information displaying are disclosed. The paging processing method includes: receiving a paging request message from a Mobile Switching Center (MSC) which a called User Equipment (UE) registers to; and when the called UE is connected, sending a paging notification message to the called UE, and returning a called-UE paging status message to the MSC. In the embodiments of the present invention, after the Mobility Management Entity (MME) receives the paging request message from the MSC, if the called UE is connected, the MME not only sends a Circuit-Switched (CS) paging notification message to the called UE, but also returns a paging status message to the MSC, indicating that the called UE has received the paging notification message.