ACDC Category Mapping for Wireless Initial Access Congestion
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Solution Overview
Problem
Wireless communication systems face challenges in effectively transmitting application packets when the serving network is congested, particularly due to over traffic or mismatched ACDC categories between home and serving networks, leading to denied or deferred access.
Innovation Solution
The implementation of a method and apparatus for initial access based on the Application specific Congestion control for Data Communication (ACDC) category mapping scheme, which involves receiving ACDC configuration information and access parameters, performing initial access according to ACDC category access parameters, and using ACDC category mapping information to ensure compatibility and priority-based access even when networks are congested or categories are mismatched.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the serving network implements congestion control by denying or deferring initial access requests, then network overload is reduced, but application packet transmission is blocked during congestion
Solution Approach 1:
The patent segments the initial access procedure into multiple ACDC categories (e.g., category 0 with barring factor 0.66, category 1 with barring factor 0.33, category 2 with barring factor 0). This segmentation allows different application types to be treated differently during congestion, enabling critical applications to access the network while non-critical applications are throttled, thus maintaining both network stability and essential productivity
Solution Approach 2:
The patent applies different quality levels of access control to different ACDC categories locally. Each category has its own barring factor and barring time parameters, allowing the network to apply differentiated congestion control policies to specific application types rather than uniformly blocking all access requests, thereby preserving critical transmissions while managing overall load
2Ease of manufacture
If the serving network uses generic access control parameters, then implementation is simple, but ACDC category mismatch between home network and serving network causes access failures
Solution Approach 1:
The patent establishes a universal ACDC category mapping framework that works across different home networks and serving networks. The mapping table structure and category definitions are standardized, allowing the same ACDC mechanism to function universally across network boundaries while adapting to local congestion conditions, thus achieving both implementation simplicity and cross-network compatibility
Solution Approach 2:
The patent introduces ACDC category mapping information as an intermediary layer between the home network's ACDC configuration and the serving network's access control parameters. This mapping information, transmitted via NAS signaling or system information blocks, translates home network category requirements into serving network-compatible parameters, enabling seamless interoperability without complex direct integration
3Reliability
If the UE attempts initial access with high priority ACDC category during congestion, then critical application transmission is prioritized, but network congestion worsens due to increased access attempts
Solution Approach 1:
The patent changes the barring factor parameter for high-priority ACDC categories from the default value (e.g., category 0 has barring factor 0.66 instead of 1.0, category 2 has barring factor 0). This parameter modification allows critical applications to attempt access more frequently during congestion without completely blocking non-critical traffic, balancing service availability with congestion management by adjusting probabilistic access control parameters
Data Source
AI summary
The present invention provides methods and apparatus for performing initial access based on the Application specific Congestion control for Data Communication (ACDC) category mapping scheme. One of methods for performing initial access based on an Application specific Congestion control for Data Communication (ACDC) category in a wireless access system, the method performed by a user equipment (UE) and comprising: receiving, from a home network, ACDC configuration information representing ACDC categories supported by the home network; receiving, from a serving network, ACDC category access parameters including barring information of the serving network; and performing the initial access based on the ACDC configuration information and the ACDC category access parameters when an application packet to be transmitted is generated, wherein the barring information includes barring time value and barring factor value representing a probability of denied or deferred of the initial access according to ACDC category of the serving network.