Extended Access Barring for MTC Congestion Control
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing machine-type communication (MTC) devices due to congestion and overload issues, particularly in scenarios where a large number of MTC devices need to access the network simultaneously, leading to potential network overload and degraded performance for human-to-human communication.
Innovation Solution
The implementation of extended access barring (EAB) mechanisms in wireless communication systems, which include determining whether EAB information is applied by checking 'eabApplication' information in the random access response, allowing MTC devices to perform random access procedures based on EAB information, and adjusting access attempts according to EAB settings to prevent network overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If MTC devices perform random access procedures without access barring, then access simplicity is maintained, but network overload occurs due to simultaneous access attempts from large numbers of MTC devices
Solution Approach 1:
The patent applies parameter changes by introducing access barring parameters (ac-BarringFactor, ac-BarringTime) that dynamically control the probability and timing of random access attempts. MTC devices evaluate these parameters to determine whether to defer access, thereby adjusting the access rate to prevent network overload while maintaining operational simplicity through standardized procedures.
Solution Approach 2:
The patent implements dynamics through time-based access control where devices use random backoff timers (ac-BarringTime) to stagger their access attempts. This dynamic timing mechanism transforms static access restrictions into adaptive behavior, allowing the network to handle varying loads by controlling when devices attempt access rather than permanently blocking them.
2Reliability
If access barring is applied to control MTC device access, then network overload is prevented, but access delay increases for legitimate MTC devices
Solution Approach 1:
The patent applies partial action by implementing probabilistic access barring where not all devices are blocked, but rather a controlled proportion (ac-BarringFactor) is restricted. This partial restriction prevents complete access denial while still reducing overall access attempts to acceptable levels, balancing network protection with device access needs.
Solution Approach 2:
The patent uses periodic action through random backoff timers that create staggered access attempts over time. Devices that are barred retry after random intervals (ac-BarringTime), creating a periodic pattern of access attempts that distributes load over time rather than concentrating it, thereby reducing peak network stress while allowing eventual access.
3Measurement precision
If extended access barring information is transmitted to all devices, then access control precision is improved, but signaling overhead increases
Solution Approach 1:
The patent applies segmentation by dividing access control information into device-specific parameters (ac-BarringFactor, ac-BarringTime) that are evaluated locally by each MTC device. This segmentation allows precise control for different device types and scenarios without requiring continuous centralized signaling, as devices autonomously apply the parameters to their access decisions.
Solution Approach 2:
The patent implements preliminary action by pre-configuring access barring parameters in system information blocks before devices need to access the network. Devices receive and store these parameters in advance, allowing them to make immediate access decisions without real-time signaling, thereby achieving precise control with minimal ongoing signaling overhead.
Data Source
AI summary
A method and apparatus for extended access barring (EAB) in a wireless communication system. In the proposed method, EAB application information is defined. Further, a base station is configured to send random access (RA) response within RA response window if it receives any random access preamble, so RA response window should be set as the minimum time duration UE should check the existence of RA response. In the proposed method, the UE configured with EAB should wait the duration of RA response window to receive RA response before skipping initial EAB checking. If RA response window passed and no RA response received, UE skips EAB checking in case of initial random access preamble transmission.