Dynamic Access Control for RRC Inactive UEs in New Radio
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Solution Overview
Problem
Current access control schemes in 4G wireless networks fail to effectively manage RRC_INACTIVE UEs, leading to network overload due to underestimated traffic conditions, as they do not account for UEs capable of direct uplink data transmission without transitioning to RRC_CONNECTED state, resulting in excessive radio resource consumption and processing capacity issues.
Innovation Solution
A method and system for dynamic access control in new radio wireless networks that utilize a multi-layer access control information structure, where a first layer indicates whether access is allowed based on access categories, and a second layer provides specific parameters for access attempts, allowing for categorization and sub-categorization of UEs based on RRC states, quality of service, and data size, to manage traffic conditions and conserve radio resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If legacy 4G access control schemes are used to manage RRC_IDLE UEs, then RRC_IDLE UEs can be effectively barred from accessing the network during overload, but RRC_INACTIVE UEs cannot be managed, leading to network overload
Solution Approach 1:
The access control mechanism is segmented into multiple layers: a first layer providing coarse-grained access control indicators for different access categories, and a second layer providing fine-grained specific parameters. This segmentation allows the system to efficiently manage different RRC states (RRC_IDLE and RRC_INACTIVE) separately, addressing the adaptability issue while maintaining reliability through the structured control approach.
Solution Approach 2:
The access control parameters are made dynamic rather than static. The base station can dynamically adjust access control indicators and specific parameters based on current network conditions, allowing the system to adapt to varying traffic conditions and effectively manage different RRC states. This dynamic adjustment capability enables the system to respond to overload conditions by selectively barring RRC_INACTIVE UEs while maintaining control over RRC_IDLE UEs.
2Use of energy by moving object
If RRC_INACTIVE UEs are allowed to transmit data directly without transitioning to RRC_CONNECTED state, then radio resource consumption is reduced, but network traffic conditions become underestimated and overload occurs
Solution Approach 1:
The system implements feedback mechanisms where the base station monitors actual network traffic conditions and adjusts access control parameters accordingly. When RRC_INACTIVE UEs transmit data directly, the base station receives this traffic and uses it to update its traffic condition assessment. This feedback loop ensures that the base station maintains accurate knowledge of total network traffic (including direct RRC_INACTIVE transmissions) and can adjust access control to prevent overload, while still allowing the energy-efficient direct transmission mode.
3Ease of operation
If access control parameters are provided in a detailed manner, then precise control over different access categories is achieved, but signaling overhead and system complexity increase
Solution Approach 1:
The access control information is segmented into two distinct layers: a first layer containing access control indicators that provide high-level control decisions, and a second layer containing specific parameters that provide detailed control. This segmentation allows the system to maintain precision by providing detailed parameters when needed while reducing overall complexity through the hierarchical structure. The first layer can be processed independently for quick decisions, while the second layer provides additional detail only when required.
Solution Approach 2:
The access control information structure transitions from a single-dimensional detailed parameter set to a two-dimensional hierarchical structure. The first layer operates at a higher abstraction level with general access control indicators, while the second layer operates at a lower abstraction level with specific parameters. This dimensional change allows the system to achieve precise control through the combination of both layers while managing complexity through the hierarchical organization, where not all detailed parameters need to be processed in all cases.
Data Source
AI summary
A method for a wireless device to establish an RRC connection with a network for accessing a network slice of the network is provided. The method receives, from the network, an access control parameter configuration of an access category associated with the network slice while the wireless device is in a Radio Resource Control (RRC) inactive state (RRC INACTIVE). The method then initiates a random access procedure for establishing the RRC connection with the network to access the network slice according to an access control indicator of the access control parameter configuration of the access category.