NAS Signaling Request Handling in Wireless Communication Systems
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in processing non-access stratum (NAS) signaling requests when they fail or are rejected due to lower layer or network failures, leading to delayed services and unnecessary resource consumption.
Innovation Solution
A method is introduced where a user equipment (UE) receives a message indicating network failure, starts a network selection timer, and selects an alternative network or radio access technology (RAT) and public land mobile network (PLMN) while the timer runs, allowing for immediate RAT change or PLMN reselection without reattempting the NAS signaling request.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE reattempts the NAS signaling request procedure after failure or rejection, then the service delay increases and network resources are consumed unnecessarily, but the UE may eventually succeed in establishing connection
Solution Approach 1:
The UE performs PLMN reselection and RAT change before reattempting NAS signaling, proactively preparing alternative connection paths in advance. This preliminary action allows the UE to switch networks or access technologies when failure is detected, reducing the time spent on repeated attempts on the same failed network and improving overall connection establishment reliability.
2Loss of time
If the UE immediately switches to alternative network or RAT upon receiving network failure indication, then service delay is reduced, but the UE may miss potential recovery of the original network
Solution Approach 1:
The UE dynamically adjusts its network selection behavior based on the type of failure indication received. When receiving a network failure indication, the UE immediately performs PLMN reselection and RAT change. However, the UE maintains the capability to return to the original network if it recovers, creating a dynamic adaptation mechanism that balances speed of service restoration with connection stability.
3Loss of energy
If the UE performs PLMN reselection and RAT change upon network failure, then network resource consumption is reduced, but the device complexity increases
Solution Approach 1:
The UE applies different network selection strategies based on the specific failure scenario. When network failure is detected, the UE performs PLMN reselection and RAT change to switch to alternative networks. This localized adaptation to failure conditions allows the UE to conserve network resources by avoiding repeated attempts on a failed network, while the complexity is managed through condition-based decision-making rather than universal complexity.
Data Source
AI summary
The present invention relates to a wireless communication system, and more particularly, to a method and an apparatus for processing a NAS signaling request. A method for performing a non-access stratum (NAS) signaling process by means of a terminal in a wireless communication system according to one embodiment of the present invention comprises: a step of receiving a first message that includes information indicating a network failure from a network node of a first network; a step of starting a timer relating to a network selection; and a step of selecting a second network from among network candidates excluding the first network during the operation of the timer relating to a network selection.