Network Selection via PLMN CSG ID Combination Parameter
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Solution Overview
Problem
Users cannot access desired CSG cells if they are not on a network with an access priority, leading to restricted network services.
Innovation Solution
A method for network selection that involves obtaining a PLMN/CSG ID combination parameter, querying an allowed CSG list, and selecting a network based on the query result, including prioritization and auxiliary parameters such as access technology and time, to ensure access to preferred CSG cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE follows traditional network selection procedures (PLMN selection first, then cell selection), then the network selection process is simple and follows standard protocols, but the user cannot access desired CSG cells if they are not on a network with access priority
Solution Approach 1:
The patent segments the network selection process into two distinct modes: traditional PLMN-based selection and CSG-based selection. The UE can switch between these modes based on whether a desired CSG cell is available. This segmentation allows the system to access CSG cells without being constrained by traditional PLMN priority rules, thereby improving CSG cell access capability while maintaining manageable complexity through structured process division.
Solution Approach 2:
The patent introduces dynamic adaptability in the network selection process by allowing the UE to change selection criteria based on real-time conditions. When a desired CSG cell is detected, the UE dynamically switches from PLMN-based selection to CSG-based selection, bypassing traditional priority constraints. This dynamic approach enables flexible access to CSG cells while maintaining the ability to follow standard protocols when CSG cells are not available.
2Ease of operation
If the UE prioritizes access to CSG cells regardless of network priority, then the user can access desired CSG cells, but the network selection process becomes more complex and may conflict with existing PLMN selection rules
Solution Approach 1:
The patent applies preliminary action by having the UE check for desired CSG cells before finalizing network selection. The UE identifies available CSG cells in advance and determines whether they should be prioritized over PLMN selection criteria. This preliminary check ensures that CSG cell access is facilitated when desired, while maintaining reliability by following established PLMN selection rules when CSG cells are not available or not desired.
Solution Approach 2:
The patent introduces an intermediary decision-making mechanism that mediates between CSG cell access desires and traditional PLMN selection rules. This intermediary layer evaluates multiple factors including user preferences, signal quality, and network availability to determine the optimal selection path. By acting as a mediator, the system balances ease of CSG cell access with reliability of network selection, avoiding direct conflicts with existing protocols.
3Measurement precision
If the UE checks CSG ID against allowed CSG list after cell selection, then the access control is maintained, but the user cannot access CSG cells on non-priority networks and must reselect another cell
Solution Approach 1:
The patent applies preliminary action by integrating CSG list verification into the cell selection phase rather than performing it after cell selection. The UE checks whether the detected cell is a CSG cell and verifies the CSG ID against the allowed CSG list during the selection process itself. This preliminary verification prevents wasted time on cells that cannot be accessed, while maintaining precise access control by ensuring only authorized CSG cells are selected.
Solution Approach 2:
The patent enables the UE to skip unnecessary reselection steps by performing CSG verification early in the selection process. When a desired CSG cell is identified and verified against the allowed CSG list, the UE can directly camp on that cell without undergoing additional reselection procedures. This skipping mechanism reduces network selection time while maintaining access control precision by ensuring verification occurs before final selection.
Data Source
AI summary
A method, user equipment (UE) and system relates to communications technologies, and in particular, to a network selection technology for a UE on a mobile communication network. The method includes obtaining a public land mobile network and closed subscriber group identity (PLMN/CSG ID) combination parameter of a network that covers a current location; querying an allowed CSG list according to the PLMN/CSG ID combination parameter; and selecting a network according to a query result.