User Equipment E-UTRAN Capability Management During PLMN Handover
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Solution Overview
Problem
User equipment (UE) faces challenges in managing E-UTRAN capability during mobility, particularly when switching between different radio access technologies (RATs) due to unavailability of circuit switched (CS) services, leading to inefficient network handovers and continued usage of suboptimal RATs despite better alternatives being available.
Innovation Solution
The UE method involves switching from a first RAT to a second RAT when CS services are not available, establishing a CS call session, receiving a handover command to move to a second PLMN, and enabling E-UTRAN capability after moving to connect with a fourth RAT available in the second PLMN, ensuring optimal network utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE disables E-UTRAN capability when CS services are unavailable in the current PLMN, then the UE can establish CS services through 2G/3G RAT, but the UE continues to remain in 2G/3G RAT even when E-UTRAN capability becomes available in the target PLMN after handover
Solution Approach 1:
The patent applies dynamics by making the E-UTRAN capability state changeable and context-dependent. The capability is dynamically enabled or disabled based on real-time network conditions and handover status, transitioning from a static disabled state to a dynamic state that adapts to network availability and UE location.
Solution Approach 2:
The patent implements feedback mechanisms where the network provides information about E-UTRAN capability availability in target PLMNs during handover procedures. The UE uses this feedback information to make informed decisions about whether to enable E-UTRAN capability in the target network, creating a closed-loop adaptive system.
2Reliability
If the UE remains in 2G/3G RAT after handover to a PLMN that supports E-UTRAN, then the UE maintains connectivity, but the UE fails to utilize the superior E-UTRAN network resources and capability
Solution Approach 1:
The patent uses network-provided feedback information about E-UTRAN capability availability in target PLMNs to guide the UE's capability enablement decisions. This feedback mechanism ensures the UE transitions to E-UTRAN when both connectivity and enhanced resources are available, optimizing network utilization.
Solution Approach 2:
The patent changes the parameter of E-UTRAN capability state from a fixed disabled state to a dynamic state that varies based on network conditions, handover status, and target PLMN capabilities. This parameter change enables the UE to adapt its behavior to maximize network resource utilization while maintaining connectivity.
3Adaptability or versatility
If the UE enables E-UTRAN capability immediately after handover to a new PLMN, then the UE can access enhanced network services, but the UE may fail to properly assess whether E-UTRAN is actually available or suitable in the target network
Solution Approach 1:
The patent applies preliminary action by having the network provide advance information about E-UTRAN capability availability in target PLMNs before the UE actually connects to them. This preliminary information exchange allows the UE to make informed decisions about capability enablement without risking connection to unsuitable networks.
Solution Approach 2:
The patent implements a feedback mechanism where the network explicitly informs the UE about E-UTRAN capability availability in target PLMNs during handover procedures. This feedback ensures the UE only enables E-UTRAN capability when it is actually available and suitable, verifying capability availability before utilization.
Data Source
AI summary
A method of managing evolved universal mobile telecommunication system terrestrial radio access network (E-UTRAN) capability of a user equipment (UE) is provided that includes switching from a first radio access technology (RAT) to a second RAT if the first RAT fails to provide circuit switched (CS) services to the UE, the first RAT and the second RAT being associated with a first public landline mobile network (PLMN). The UE establishes a CS call session with the second RAT. In the meanwhile, the UE receives a network handover command to move to a second PLMN. The UE may also perform a movement from the first PLMN to the second PLMN and connect with a third RAT associated with the second PLMN to continue the CS call session. The UE enables the E-UTRAN capability after moving to the second PLMN to connect with a fourth RAT available in the second PLMN.