Radio Terminal ACDC Category Mapping for Access Control
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Solution Overview
Problem
The interaction among the application layer, NAS layer, and RRC layer for implementing ACDC in UEs is unclear when the number of ACDC categories configured in the UE is not the same as the number of categories broadcasted by the serving network, particularly in cases where the serving network broadcasts fewer categories, leading to unmatched ACDC categories.
Innovation Solution
The NAS layer or RRC layer replaces an unmatched ACDC category with a particular category broadcasted by the serving network, passing this information along with a session establishment message to the AS layer for access control, ensuring that access attempts are evaluated based on the available barring information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the serving network broadcasts fewer ACDC categories than configured in the UE, then the network can reduce broadcast overhead and simplify category management, but unmatched ACDC categories cannot be properly evaluated for access control
Solution Approach 1:
The patent introduces an intermediary mapping mechanism where the UE maintains a mapping table that associates ACDC categories broadcast by the serving network with the categories configured in the UE. When an application triggers an access attempt, the UE uses this mapping to find the corresponding broadcast category for proper access control evaluation, thus resolving the mismatch between configured and broadcast categories
Solution Approach 2:
The patent changes the parameter representation by introducing category mapping relationships. Instead of directly comparing ACDC category values, the system transforms the category identification through mapping tables that adapt the configured categories to the broadcast categories, allowing reliable access control even when the number of categories differs
2Adaptability or versatility
If the UE configures multiple ACDC categories for different applications, then fine-grained access control can be achieved, but the interaction among NAS layer, RRC layer, and application layer becomes unclear and complex
Solution Approach 1:
The patent segments the ACDC implementation into distinct functional layers: the NAS layer handles ACDC category configuration and application-layer triggering, the RRC layer manages ACDC category broadcasting and access control decisions, and the application layer provides access attempts. This clear segmentation defines specific responsibilities for each layer, reducing interaction complexity while maintaining fine-grained control
Solution Approach 2:
The patent introduces an intermediary ACDC control entity that coordinates between the NAS layer, RRC layer, and application layer. This intermediary manages the ACDC category mappings and coordinates access control decisions, providing a clear interface between layers and simplifying the overall interaction while enabling fine-grained control
3Reliability
If the serving network broadcasts ACDC barring information for all configured categories, then complete access control coverage is achieved, but broadcast overhead and network signaling increase
Solution Approach 1:
The patent makes the ACDC category mapping mechanism universal, allowing the same mapping table to handle multiple scenarios: when the number of broadcast categories equals configured categories, when broadcast categories are fewer, and when they are more. This universal approach enables complete access control coverage through a single efficient mechanism rather than requiring separate handling for each scenario
Solution Approach 2:
The patent changes the parameter representation by using mapped category identifiers instead of direct category values. The UE transforms application-triggered ACDC category evaluations into the corresponding broadcast category space through parameter mapping, enabling complete access control coverage while the network broadcasts information only for its configured categories, reducing broadcast overhead
Data Source
AI summary
In one implementation, a NAS layer (202) of a radio terminal (1) obtains, from an AS layer (208) of the radio terminal (1), either or both of: information regarding one or more access barring categories (401) broadcasted by a serving network (2); and the number of the one or more access barring categories. If barring information corresponding to a first access barring category (404) to which an application that triggers a session establishment (403) belongs is not broadcasted by an eNB (2), the NAS layer (202) replaces the first access barring category (404) with a particular access barring category among the one or more access barring categories (401) broadcasted by the serving network (202).