Restricted RAT Cell Selection for National Roaming QoS
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Solution Overview
Problem
Existing cellular communication technologies face issues with network congestion, quality of service concerns, and interoperability challenges during national roaming due to unrestricted use of radio access technologies (RATs), leading to inefficient network connections and resource wastage.
Innovation Solution
The network provides a list of restricted RATs to user equipment (UE) through non-access stratum messages and new information elements, enabling the UE to select available RATs proactively, reducing unnecessary scans and reconnection attempts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network restricts certain RATs for specific users in certain areas, then network congestion and quality of service are improved, but the device complexity and signaling overhead increase
Solution Approach 1:
The network proactively provides a list of restricted RATs to the UE before the UE attempts to connect. This preliminary action allows the UE to avoid scanning and attempting connection on restricted RATs, thereby preventing network congestion and quality of service degradation without requiring complex real-time decision-making at the device level.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network sends restricted RAT information through non-access stratum messages and information elements. This intermediary layer manages the complexity of RAT restriction control at the network side, shielding the UE from complex decision-making while maintaining quality of service through controlled access.
2Adaptability or versatility
If the UE scans all available RATs without restriction information, then the UE can find any available network, but connection delays and resource wastage increase
Solution Approach 1:
The network provides restricted RAT information to the UE in advance through non-access stratum messages. This preliminary information allows the UE to proactively exclude restricted RATs from its scanning list, maintaining adaptability to find available networks while significantly reducing connection delays and resource wastage by avoiding futile scanning attempts on restricted RATs.
3Productivity
If the network rejects UE connection attempts on restricted RATs, then RAT utilization is controlled, but signaling loads and reconnection attempts increase
Solution Approach 1:
Instead of passively rejecting UE connection attempts on restricted RATs, the network proactively provides restricted RAT information to the UE beforehand. This preliminary anti-action prevents the UE from attempting connections on restricted RATs in the first place, thereby controlling RAT utilization while significantly reducing signaling loads and unnecessary reconnection attempts.
4Ease of operation
If the UE uses unrestricted RAT selection, then the UE has maximum flexibility in network selection, but network congestion and resource wastage occur
Solution Approach 1:
The network provides restricted RAT information to the UE in advance, enabling the UE to maintain ease of operation with automatic RAT selection while preventing resource wastage. The UE continues to operate autonomously with maximum flexibility in selecting from available non-restricted RATs, while the preliminary restriction information prevents unnecessary scanning and connection attempts on restricted RATs that would cause network congestion and resource wastage.
Data Source
AI summary
Techniques are provided for restricted radio access technology-based cell selection. An example method can include processing information from a public land mobile network (PLMN) indicating a first restricted radio access technology (RAT). The method can further include accessing memory to identify a set of RATs for connecting with the PLMN. The method can further include selecting a second RAT instead of the first restricted RAT from the set of RATs-based on the indication of the first restricted RAT. The method can further include connecting with a cell of the PLMN using the second RAT.