Base Station Access Control for 5G Core Network Overload
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Solution Overview
Problem
In 5G communication systems, the core network faces overload issues due to the maintenance of NG connections for UEs in the RRC inactive state, making it difficult to manage and control access effectively, as the core network cannot accurately determine the RRC state of each UE.
Innovation Solution
The method involves the base station receiving information from the core network on restricted RRC connection procedures for UEs in an RRC inactive state and transmitting messages to restrict or allow specific RRC connection procedures, such as paging area updates, RAN-based area updates, mo-data, and early data transmission, to manage access and prevent overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the core network maintains NG connections for UEs in RRC inactive state, then the UE can generate minimal signaling and minimize power consumption, but the core network falls into a severely overloaded state
Solution Approach 1:
The base station acts as an intermediary between the core network and UEs in RRC inactive state. It receives access restriction information from the core network and enforces it by rejecting specific RRC connection procedures from inactive UEs, thereby protecting the core network from overload while allowing the inactive state to continue benefiting UEs
Solution Approach 2:
The access control function is segmented into two parts: the core network generates access restriction information based on overload conditions, and the base station executes the actual access control by evaluating RRC connection requests against these restrictions. This segmentation allows the core network to avoid direct overhead of tracking individual UE states
2Reliability
If the core network restricts access of RRC inactive UE, then the overload state is prevented, but the core network cannot accurately determine the RRC state of each UE
Solution Approach 1:
The base station serves as an intermediary that has access to both the core network's overload status and the actual RRC states of UEs. It receives access restriction information from the core network and uses its local knowledge of UE RRC states to enforce appropriate access control, bridging the information gap between core network and UE state management
3Productivity
If the base station receives access restriction information from the core network, then the core network can control UE access without checking RRC state of each UE, but the base station must evaluate each RRC connection request
Solution Approach 1:
The core network performs preliminary action by generating and transmitting access restriction information to the base station before actual RRC connection requests arrive. This pre-configured restriction information allows the base station to quickly evaluate incoming requests without real-time complex analysis, improving processing efficiency
Solution Approach 2:
The system implements feedback mechanisms where the base station reports RRC connection procedure outcomes to the core network, and the core network adjusts access restriction information based on network conditions. This feedback loop enables dynamic optimization of access control parameters without requiring the core network to continuously monitor individual UE states
Data Source
AI summary
Provided are a method by which a base station controls the access of a terminal, and a device for supporting the same. The method comprises the steps of: receiving, from a core network, information on an RRC connection procedure in which access in an RRC inactive state is restricted; receiving a request for executing the RRC connection procedure from a terminal which is in the RRC inactive state; and transmitting, to the terminal, a message notifying that the requested execution of the RRC connection procedure has been restricted, when the RRC connection procedure requested from the terminal corresponds to the RRC connection procedure in which the access is restricted.