IMS Registration Recovery in Mobile Communication Systems
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Solution Overview
Problem
In the 5G communication era, terminals experience IMS registration failures due to weak signals or network issues, leading to loss of high-definition voice calls, and are unable to quickly recover these services even when moving to areas with stronger signals, affecting user experience.
Innovation Solution
A method and device that determine if a second cell meets conditions for IMS registration, such as signal strength or previous successful registration, and initiate an initial IMS registration, allowing for quick recovery of call services by restarting the protocol stack, re-establishing link connectivity, and switching network modes if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal waits for the re-registration timer to expire before attempting IMS registration again, then the terminal avoids unnecessary registration attempts in poor signal areas, but the terminal cannot quickly recover call service when moving to areas with strong signal
Solution Approach 1:
The patent makes the re-registration timer dynamic by allowing it to be adjusted based on terminal movement state. When the terminal detects that it has moved to a cell with better signal quality (e.g., based on reference signal received power or cell identity changes), it can reset or reduce the re-registration timer, enabling faster re-registration attempts without waiting for the original timer to expire. This dynamic adjustment resolves the contradiction by adapting the waiting period to actual network conditions.
Solution Approach 2:
The terminal autonomously monitors its own signal quality and movement state, and self-determines when to reset the re-registration timer without external network control. The terminal compares current cell parameters with previously stored parameters to detect movement, and independently decides to initiate re-registration when improvement is detected, enabling quick service recovery without network intervention.
2Speed
If the terminal continuously attempts IMS registration in poor signal areas, then the terminal can quickly try to recover service when signal improves, but the terminal wastes resources and cannot successfully register due to persistent failures
Solution Approach 1:
The patent implements a feedback mechanism where the terminal monitors the outcome of each IMS registration attempt and uses this information to adjust future behavior. When registration fails due to poor signal, the terminal stores the failure information and avoids immediate re-attempts in the same cell. When the terminal moves to a different cell or signal conditions improve (detected through feedback from signal quality measurements), it then initiates re-registration, optimizing the balance between recovery speed and energy consumption.
Solution Approach 2:
The terminal performs preliminary assessment of signal quality and cell conditions before initiating IMS registration attempts. By checking signal strength and comparing current cell parameters with stored parameters in advance, the terminal can determine whether conditions are suitable for registration, avoiding wasteful registration attempts in poor conditions while being ready to quickly attempt registration when conditions improve.
3Reliability
If the terminal is controlled by the re-registration timer and cannot immediately try to register after movement, then the terminal avoids premature registration attempts, but the terminal cannot take advantage of improved signal conditions in real-time
Solution Approach 1:
The patent makes the re-registration timer dynamic by allowing it to be adjusted or reset based on terminal movement state. When the terminal detects that it has moved to a cell with better signal quality (e.g., based on reference signal received power or cell identity changes), it can reset or reduce the re-registration timer, enabling faster re-registration attempts without waiting for the original timer to expire. This dynamic adjustment resolves the contradiction by adapting the waiting period to actual network conditions.
Solution Approach 2:
The terminal autonomously monitors its own signal quality and movement state, and self-determines when to reset the re-registration timer without external network control. The terminal compares current cell parameters with previously stored parameters to detect movement, and independently decides to initiate re-registration when improvement is detected, enabling quick service recovery without network intervention.
Data Source
AI summary
A method and a device for recovering a call service in a mobile communication system are provided. The method includes the following steps determining whether a second cell satisfies a condition for a terminal to perform an IP multimedia subsystem (IMS) registration when detecting that the terminal enters the second cell during a period in which the terminal waits for a next IMS registration due to an IMS registration failure in a first cell, initiating an initial IMS registration when determining that the second cell satisfies the condition, and recovering a call service of the terminal after the initial IMS registration is successful.