Access Barring Alleviation in Wireless User Devices
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Solution Overview
Problem
Current access control mechanisms in wireless communication systems, such as Unified Access Control (UAC), fail to completely and selectively shut down user equipment (UE) message transmissions for specific access categories, leading to inefficient network congestion management when the barring factor is set to maximize access barring probability, as UEs may transmit messages after a timer expires even when the network intends to prevent them.
Innovation Solution
User devices implement additional checks and actions based on the barring factor value, such as suspending message transmissions indefinitely if the barring factor corresponds to the maximum probability, and only considering access alleviation when a new barring factor value is received, to ensure that messages are not transmitted when the network intends to bar access completely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network sets the barring factor to maximum probability (p00) to completely block access, then access control reliability is improved, but UEs may still transmit messages after timer expiration, causing access control to fail
Solution Approach 1:
The patent applies preliminary action by having the UE check the barring factor value before starting the barring timer. When the barring factor indicates maximum barring probability (p00), the UE performs a preliminary check that prevents the timer from expiring and allowing access, thus proactively preventing the undesired transmission before it can occur.
Solution Approach 2:
The patent implements feedback by having the UE continuously monitor the barring factor value and adjust its transmission behavior accordingly. When the barring factor changes from p00 to a lower value, the UE receives feedback that access barring is alleviated and can resume transmissions. This closed-loop feedback mechanism ensures access control reliability while maintaining simple UE logic.
2Adaptability or versatility
If the UE implements timer-based access barring alleviation, then UE can resume transmission after congestion, but UEs may transmit messages even when network intends to completely block access
Solution Approach 1:
The patent applies preliminary action by checking the barring factor value before allowing timer expiration to trigger access alleviation. The UE performs a preliminary verification that the barring factor is no longer at maximum probability before resuming transmissions, preventing unauthorized access while maintaining legitimate transmission adaptability.
Solution Approach 2:
The patent uses parameter changes by having the UE monitor changes in the barring factor parameter. When the network changes the barring factor from p00 to a lower value, the UE detects this parameter change and adjusts its transmission behavior accordingly, enabling adaptability while ensuring network control effectiveness.
3Productivity
If the network uses probabilistic access control with barring factor, then network congestion is reduced, but network loses flexibility to completely shut down transmissions for specific access categories
Solution Approach 1:
The patent applies local quality by making the access control behavior specific to different barring factor values. The network can set the barring factor to p00 for access categories that need complete blocking, while using lower values for categories that need probabilistic control. This localized differentiation provides both congestion reduction and complete shutdown capability.
Solution Approach 2:
The patent implements dynamics by making the access control mechanism adaptable to changing network conditions through dynamic barring factor adjustments. The network can change the barring factor value in real-time to achieve different control objectives, providing flexibility to completely shut down transmissions when needed while maintaining probabilistic control for normal operation.
Data Source
AI summary
A method for avoiding undesired message transmissions from a user device to a RAN is implemented in a user device. The method includes receiving (202 or 302), from the RAN, a first value of the barring factor, and determining (206 and 210 or 306 and 310), based on a first probability corresponding to the first value, that access barring applies to a message transmission. The method also includes suspending (214 or 314) the message transmission while running a first timer (216 or 316) and, after the first timer expires or stops, either (1) if the first value does not correspond to a maximum probability of the different probabilities, determining (222 or 322) that the access barring is alleviated, or (2) if the first value corresponds to the maximum probability, continuing to suspend (224 or 326) the message transmission.