PLMN Access Prohibition for Wireless Network Overload Control
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, there is a challenge in efficiently managing PLMN selection to prevent network overload and ensure service availability, as MTC devices often attempt to access the network simultaneously, leading to access restrictions and service disruptions due to overload in some PLMNs.
Innovation Solution
A method where user equipment receives a PLMN list and access prohibition information from the network, limiting access to specific PLMNs for a designated time duration, allowing for dynamic PLMN selection and re-selection processes, with the RRC layer reporting prohibition indicators to the NAS layer and excluding prohibited PLMNs from the selection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MTC devices attempt to access the network simultaneously, then service availability increases, but network overload occurs leading to access restrictions
Solution Approach 1:
The system performs preliminary action by prohibiting access to overloaded PLMNs before MTC devices attempt to access the network. The prohibition indicator is sent in advance through system information blocks, preventing devices from selecting overloaded networks and avoiding access restrictions before they occur.
Solution Approach 2:
The patent introduces an intermediary mechanism using prohibition indicators transmitted through system information blocks (SIBs) as a mediator between the network and MTC devices. This intermediary element conveys network status information without direct network-device interaction, enabling preventive access control.
2Object-generated harmful factors
If access restriction is applied to overloaded PLMNs, then network overload is reduced, but service availability may be impacted
Solution Approach 1:
The access restriction mechanism is dynamic rather than static. The prohibition indicator is transmitted periodically through system information blocks, allowing the network to dynamically adjust access restrictions based on real-time overload conditions. This dynamic approach enables the system to respond to changing network status while maintaining service availability when conditions improve.
3Ease of operation
If PLMN selection is restricted for a specific time duration, then access control is improved, but latency increases
Solution Approach 1:
The system implements periodic action by transmitting prohibition indicators through system information blocks at regular intervals. This periodic transmission allows devices to receive updated access control information without continuous interruption, balancing access control effectiveness with latency considerations through time-efficient information delivery.
Data Source
AI summary
Disclosed is a method of receiving PLMN (Public Land Mobile Network) information at a terminal in a wireless communication. In particular, the method of the present invention comprises the steps of receiving system information including a PLMN list and a prohibition indicator for limiting access to at least one PLMN of the PLMN list and performing access limitation to the specific network during a specific time.