Dynamic PLMN/NPN Service Unsubscription for Resource and DoS Control
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Solution Overview
Problem
There is currently no option for a UE to unsubscribe from PLMN/NPN services or credentials, especially in NR-U deployments for local area networks, leading to inefficient resource consumption and potential DoS attacks.
Innovation Solution
A UE can unsubscribe from PLMN/NPN services through captive portal-based or direct unsubscribe processes, involving redirection to a captive portal for payment or CRM system interaction, or direct deregistration via AMF and UDM nodes, respectively, with capabilities indicated in registration messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE continuously maintains PLMN/NPN service subscription, then service availability is ensured, but resource consumption increases and DoS attack risk rises
Solution Approach 1:
The patent implements dynamic subscription management by enabling UEs to switch between subscribed and unsubscribed states based on real-time conditions. The network dynamically updates subscription status through deregistration procedures, allowing the system to adapt from a static continuous subscription model to a dynamic conditional subscription model, thereby reducing resource consumption while maintaining service availability when needed.
Solution Approach 2:
The patent establishes feedback mechanisms where the network monitors UE behavior and service conditions, then provides feedback through deregistration requests and acceptance messages. This feedback loop allows the system to automatically adjust subscription status based on actual usage patterns and network conditions, preventing unnecessary resource consumption while ensuring service availability when required.
2Reliability
If a UE continuously maintains PLMN/NPN service subscription, then service availability is ensured, but vulnerability to DoS attacks increases
Solution Approach 1:
The patent applies dynamics by enabling the subscription state to change from a fixed continuous state to a flexible conditional state. UEs can dynamically deregister from services when conditions change, which prevents attackers from exploiting continuously active subscriptions. This dynamic state management reduces the attack surface while maintaining service availability for legitimate users.
Solution Approach 2:
The patent implements preliminary anti-action by allowing UEs to proactively deregister from services before malicious actors can exploit them. The system provides mechanisms for UEs to preemptively terminate subscriptions under certain conditions, countering potential DoS attacks before they can succeed. This preventive approach reduces vulnerability while preserving service availability through controlled deregistration procedures.
3Loss of energy
If dynamic unsubscribe capability is added to PLMN/NPN services, then resource efficiency improves, but system complexity increases
Solution Approach 1:
The patent applies universality by designing the deregistration mechanism to serve multiple functions: it enables resource efficiency by allowing selective unsubscribing, provides security by enabling DoS protection, and maintains backward compatibility with existing PLMN/NPN services. The same deregistration procedure handles various scenarios including voluntary unsubscribing, condition-based termination, and security responses, thereby achieving resource efficiency without proportionally increasing system complexity.
Solution Approach 2:
The patent introduces intermediary elements such as dedicated information elements in signaling messages and intermediate processing steps in the deregistration procedure. These intermediaries simplify the overall system architecture by providing standardized interfaces and controlled transition points, making the dynamic unsubscribe capability easier to integrate and manage despite the added functionality.
4Quantity of substance
If unsubscribe process requires captive portal redirection, then billing control is improved, but operation time increases
Solution Approach 1:
The patent applies partial action by implementing selective redirection to captive portals only when necessary for billing control, rather than requiring redirection for all unsubscribe operations. The system can process simple deregistrations directly without captive portal involvement, while reserving captive portal redirection for cases where billing verification is required. This partial application of the captive portal mechanism reduces operation time while maintaining billing control where needed.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for dynamically unsubscribing from a public land mobile network (PLMN)/non-private network (NPN) service. In example embodiments, a method is provided. The method comprises transmitting, by a user equipment (UE), at least one first message (112, 114) associated with registering with at least one network, wherein the at least one first message (112, 114) includes first information that indicates whether the user equipment (UE) is capable of unsubscribing from one or more services associated with the at least one network; and receiving, by the user equipment (UE), at least one second message (124) associated with accepting registration of the user equipment (UE) with the at least one network, wherein the at least one second message (124) includes second information that indicates whether the user equipment (UE) is allowed to unsubscribe from the one or more services.