RAN Access Control via Segmented Wait Times
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Solution Overview
Problem
In M2M/IoT networks, existing access control methods fail to distinguish between Radio Access Network (RAN) and Core Network (CN) overload conditions, leading to inadequate congestion management and increased failure ratios due to uniform wait times in RRC Connection Rejection messages.
Innovation Solution
The proposed solution involves determining and indicating separate wait times for RAN and CN overload conditions in access rejection messages, allowing for targeted access control and improved network congestion management by distinguishing between RAN and CN overload scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single wait time is used in RRC Connection Rejection message for both RAN and CN overload, then the access control mechanism is simple to implement, but the access control granularity is too rough and cannot effectively differentiate between RAN congestion and CN congestion
Solution Approach 1:
The patent divides the single wait time parameter into two separate wait time parameters: one for RAN overload (t302) and one for CN overload (t302). This segmentation allows the system to provide differentiated access control for different network conditions, improving access control granularity while maintaining implementation simplicity through the use of existing message structures.
Solution Approach 2:
The patent applies local quality by assigning different wait time values based on the specific network condition (RAN overload vs. CN overload). Instead of using a uniform wait time, the system tailors the wait time parameter to the local network state, enabling more precise access control that adapts to specific congestion scenarios.
2Speed
If a short wait time (e.g., 16 seconds in LTE) is used in access rejection, then UEs can quickly retry access, but network congestion is not effectively alleviated due to frequent re-access attempts
Solution Approach 1:
The patent implements dynamic wait time adjustment by setting different wait time durations based on the type of overload detected. For RAN overload, a longer wait time is applied to reduce immediate re-access attempts and alleviate congestion. For CN overload, a different wait time is used. This dynamic adaptation allows the system to balance quick access recovery with effective congestion management.
3Ease of operation
If uniform access control is applied without distinguishing RAN and CN overload, then the control mechanism is simple, but the effectiveness of congestion management is reduced due to inability to treat different congestion types differently
Solution Approach 1:
The patent segments the access control mechanism into two distinct paths: one for RAN overload handling and one for CN overload handling. Each path uses appropriate wait time parameters and rejection messages tailored to the specific overload type, enabling effective congestion management while maintaining operational simplicity through structured implementation.
Solution Approach 2:
The patent changes the wait time parameter values based on the detected overload condition. By adjusting this critical parameter dynamically - using different values for RAN versus CN overload - the system achieves effective differentiation and congestion management without requiring complex structural changes to the access control mechanism.
Data Source
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AI summary
Disclosed is an access control method, for use in implementing improved access control. The method comprises: during a random access process, on the basis of a current load of a random access network (RAN) and a core network (CN) and of terminal or service information reported by a user equipment (UE), the RAN judging whether or not access to the RAN and to the CN is allowed; when access is denied by at least one network between the RAN and the CN, the RAN transmitting to the UE an instruction message having attached therein a backoff time corresponding to the access denying network. Also disclosed is a device for implementing the method.