WTRU Mobility Enforcement via PCI-AID Mapping
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Solution Overview
Problem
Existing 5G network technologies face challenges in enforcing limited mobility for wireless transmit/receive units (WTRUs), particularly in ensuring that WTRUs do not access restricted areas without proper authorization.
Innovation Solution
The implementation of a system where WTRUs receive a list of mappings between physical cell IDs (PCIs) of neighbor cells and area identifications (AIDs), allowing them to determine whether a target cell is in an allowed or restricted area, and thereby enforcing limited mobility by excluding restricted cells from cell selection candidates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If WTRUs are allowed to freely select and access any neighbor cells, then network coverage and accessibility are improved, but unauthorized access to restricted areas cannot be prevented
Solution Approach 1:
The network performs preliminary configuration by providing WTRUs with a list of mappings between PCIs and AIDs before cell selection occurs. This allows WTRUs to proactively identify and exclude restricted cells from their selection candidates, preventing unauthorized access before it happens while maintaining free selection within allowed areas
Solution Approach 2:
The patent introduces an intermediary mechanism (the PCI-to-AID mapping list) that mediates between the WTRU's cell selection desires and the network's area restriction requirements. This intermediary enables WTRUs to make informed selection decisions that satisfy both accessibility needs and security constraints
2Reliability
If WTRUs implement area restriction checks using PCI to AID mappings, then unauthorized access to restricted areas is prevented, but processing complexity and control signaling increase
Solution Approach 1:
The patent implements self-service by enabling WTRUs to autonomously perform area restriction checks using the provided PCI-to-AID mapping list. Each WTRU independently determines whether candidate cells are restricted or allowed, eliminating the need for continuous network intervention and reducing control signaling complexity
Solution Approach 2:
The patent applies partial action by implementing area restriction checks only for WTRUs that require limited mobility support. Not all WTRUs need to perform these checks, allowing the network to selectively enable this functionality based on subscription data or specific service requirements, thereby reducing overall system complexity
Data Source
AI summary
Systems, methods, and instrumentalities are disclosed for enforcing limited mobility in a mobile network. For example, a wireless transmit/receive unit (WTRU) may receive (e.g., receive from a network) a mapping of physical cell identifications (PCIs) to area identifications (AIDs). The WTRU may determine a first PCI associated with a first neighbor cell. The WTRU may determine, based on the first PCI and the PCIs to AIDs mapping, whether the WTRU is allowed to access the first neighbor cell. The WTRU may perform cell selection or reselection with the first neighbor cell as a cell selection or reselection candidate. The WTRU may perform cell selection or reselection based on the WTRU determining that the WTRU is allowed to access the first neighbor cell. The WTRU may determine that the WTRU is allowed to access the first neighbor cell based on the first PCI and the PCIs to AIDs mapping.