UE CS Registration During PS Failure State
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Solution Overview
Problem
Mobile devices experience performance degradation due to network congestion, coverage issues, and other failures in 3GPP, LTE, and LTE-A networks, leading to poor user experience.
Innovation Solution
The solution involves a method where a User Equipment (UE) determines a failure state in a packet-switched communication session and transitions to establish a circuit-switched communication session by transmitting a CS registration message to a CS base station, while refraining from transmitting messages to the PS network, to ensure continuous communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continues to transmit registration messages to the PS network in a failure state, then the PS network registration process is followed, but this results in network congestion, coverage issues, and poor user experience
Solution Approach 1:
Instead of attempting to register with the PS network when in a failure state, the UE inverts the approach by directly selecting and registering with a CS network. This reverse strategy avoids the problematic PS registration process entirely and establishes communication through the alternative CS pathway, thereby improving reliability without sacrificing network performance
Solution Approach 2:
The UE introduces an intermediary decision-making process that monitors PS network failure states and triggers a CS network registration alternative. This intermediary mechanism acts as a mediator between the communication need and the available networks, selecting the appropriate pathway (CS instead of PS) when the primary pathway fails, thus maintaining reliability while avoiding degradation of overall network performance
2Reliability
If the UE switches to CS network for registration, then communication continuity is maintained, but this requires additional network selection logic and multi-mode operation capability
Solution Approach 1:
The UE performs preliminary monitoring of PS network registration status and pre-conditions for CS network selection. By detecting failure states in advance and preparing to switch to CS mode before complete communication failure occurs, the system maintains communication continuity while using straightforward failure-detection-and-switch logic rather than complex continuous multi-mode management
Solution Approach 2:
The UE autonomously monitors its own PS network registration state and self-determines when to switch to CS network without requiring complex external coordination. This self-service approach simplifies the system by making the device independently capable of detecting failures and selecting alternative networks, maintaining reliability through simple autonomous decision-making rather than complex coordinated control
Data Source
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AI summary
Embodiments of a User Equipment (UE) and methods for communication in multi-mode environments are generally described herein. The UE may operate in a failure state as part of a packet-switched (PS) communication session with a PS network, such as a 3GPP LTE network. The UE may determine that a circuit-switched (CS) communication session with a CS network is to be established. The UE may transmit, while operating in the failure state of the PS communication session, a CS registration message to a CS base station of the CS network as part of an establishment of the CS communication session. The UE may refrain from transmission, while operating in the failure state, of messages to the PS network for the establishment of the CS communication session.