Multi-RAT Service Access Switching Under Access Class Barring
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Solution Overview
Problem
Access class barring techniques in wireless communications systems often frustrate a user's ability to access a barred service due to local cell congestion, despite UEs supporting multiple radio access technologies (RATs) that could provide alternative access.
Innovation Solution
A UE selectively switches between different RATs (e.g., 4G LTE and 5G NR) based on the current barring factor threshold to access a service, switching to a higher power-consuming but less congested RAT when the barring factor exceeds a threshold and back to the default RAT when it falls below a reconnect threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If access class barring is implemented to limit the number of UEs attempting access to a cell, then network resource utilization is controlled, but user access to services is impeded
Solution Approach 1:
The patent changes the parameter being monitored from a simple barring factor to a composite metric that includes both the barring factor and the UE's current RAT. This allows the system to maintain network resource control while enabling UEs to access services through alternative RATs when their home RAT is congested, thus resolving the contradiction between resource control and user access.
Solution Approach 2:
The patent introduces an intermediary decision-making process that evaluates multiple factors (barring factor, RAT type, service requirements) before determining access behavior. This intermediary layer allows the system to balance network resource protection with user access needs by making nuanced decisions rather than simple binary barring.
2Loss of time
If a UE switches to a different RAT to access a service when the home RAT is barred, then service access latency is reduced, but power consumption increases
Solution Approach 1:
The patent makes the RAT selection dynamic by continuously monitoring the barring factor and service requirements. The UE adapts its behavior based on current network conditions, switching to alternative RATs only when necessary (when barring factor exceeds threshold and service requirements are met), rather than maintaining a fixed switching strategy. This dynamic approach minimizes unnecessary switches and associated power consumption while still reducing latency when needed.
Solution Approach 2:
The patent changes the decision parameter from a static barring threshold to a dynamic threshold that considers service requirements. Different services have different thresholds, allowing critical services to access alternative RATs more readily (reducing latency) while less critical services maintain lower power consumption by being more restrictive about switching.
3Reliability
If a UE monitors and responds to barring factor changes by switching RATs, then service access reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the complex decision-making process into distinct, manageable components: (1) monitoring the barring factor, (2) comparing it against service-specific thresholds, (3) determining RAT switching based on the comparison, and (4) executing the switch. This segmentation makes the overall system more manageable and implementable despite the increased functionality required for multi-RAT operation.
Data Source
AI summary
Access class barring can provide latency for accessing a barred service using a radio access technology (RAT) due to congestion of a local cell accessed via that RAT. A user equipment (UE) supports multiple RATs and the same service may be accessible via a separate cell accessed using a different RAT. Various aspects of the present disclosure describe techniques for configuring the UE to selectively switch between RATs to access a service based on a barring factor employed for a particular RAT, thereby reducing latency for accessing the service. The UEs may operate to monitor a current value of a barring factor for a service the UE seeks to access via a preferred, or default, RAT. In the event that the current value of the barring factor exceeds a specified threshold, the UE switches over to using a different RAT to access this service.