Radio Device Access Control Using Risk Indicators for Outdated AIT
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Solution Overview
Problem
In LTE cellular networks, user equipment (UE) may encounter latency and potential network misconfigurations due to outdated access information tables (AITs) and system signature sequences (SSSs), leading to inefficient access control and increased risk of access failures.
Innovation Solution
A method where a radio device receives an AIT with multiple configurations and an identifier from the cellular network, allowing it to select a configuration based on the identifier and determine whether to access the network using an associated indicator, which assesses the risk of using outdated AIT and SSI, enabling opportunistic access for non-risky configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the AIT is broadcasted with long periodicity to increase resource efficiency, then resource efficiency is improved, but the AIT may become outdated leading to access failures and network misconfigurations
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple configurations in the AIT and pre-assessing risk indicators for each configuration. When the AIT becomes outdated, the UE can immediately switch to a previously assessed safe configuration without waiting for network updates, thus maintaining reliability while keeping broadcast periodicity low for resource efficiency.
Solution Approach 2:
The patent changes the parameter of AIT update frequency by allowing the UE to operate with outdated AIT information by selecting from multiple pre-configured configurations. The risk indicator parameter enables the UE to identify which configurations remain safe to use even when the AIT is outdated, resolving the contradiction between infrequent updates and reliable access control.
2Reliability
If the UE waits for updated AIT and SSS before accessing the network, then access control reliability is improved, but access latency increases
Solution Approach 1:
The patent applies preliminary action by pre-assessing risk indicators for multiple configurations in advance and storing them in the AIT. When the UE needs to access the network, it can immediately select a configuration with a safe risk indicator without waiting for updated AIT or SSS from the network, thus reducing access latency while maintaining reliability through pre-validated configurations.
Solution Approach 2:
The patent enables self-service by allowing the UE to autonomously determine whether to access the network using stored configurations based on risk indicators. The UE independently assesses the validity of its cached AIT and SSS and can proceed with access using safe configurations without network intervention, reducing latency while maintaining access control reliability.
3Loss of time
If the UE uses outdated AIT and SSS for network access, then access latency is reduced, but the risk of access failures and network misconfigurations increases
Solution Approach 1:
The patent changes the reliability parameter by introducing risk indicators that quantify the safety of using outdated configurations. The UE can use outdated AIT and SSS with reduced latency while maintaining reliability by selecting only configurations whose risk indicators indicate they are safe to use, thus resolving the contradiction between speed and safety.
Solution Approach 2:
The patent introduces risk indicators as an intermediary mechanism between the outdated AIT/SSS and the access decision. The risk indicator acts as a mediator that enables the UE to safely use outdated information by filtering configurations through a safety assessment, allowing low latency access without compromising reliability.
4Adaptability or versatility
If multiple configurations are provided in the AIT to enable opportunistic access, then access flexibility is improved, but the AIT size and complexity increase
Solution Approach 1:
The patent applies segmentation by dividing the AIT into multiple independent configurations, each with its own risk indicator. This segmentation allows the UE to selectively use individual configurations based on their risk profiles without having to process the entire AIT, thus improving access flexibility while managing complexity through modular organization.
Solution Approach 2:
The patent manages AIT complexity by changing the parameter structure to include compact risk indicator parameters for each configuration. These parameters provide adaptability information in a concise format, allowing the UE to make flexible access decisions without being overwhelmed by the complexity of evaluating multiple full configuration sets.
Data Source
AI summary
A radio device receives an access information table from the cellular network. The access information table comprises parameters of a plurality of configurations for controlling access of the radio device to the cellular network. Further, the radio device receives an identifier from the cellular network. Depending on the identifier, the radio device selects one of the configurations from the access information table. In response to determining that at least one of the received access information table and the received identifier is outdated, the radio device determines, depending on an indicator associated with the selected configuration, whether to perform an access attempt to the cellular network on the basis of the selected configuration.