NTN Cell Barring via MIB SIB Bits for UE Network Selection
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in accurately distinguishing between terrestrial (TN) and non-terrestrial (NTN) networks, leading to inappropriate cell selection by user equipment (UE), which can result in suboptimal communication performance due to the lack of specific barring indications for NTN access.
Innovation Solution
The implementation of a method where user equipment (UE) and base stations use specific bits in Master Information Blocks (MIB) or System Information Blocks (SIB) to transmit and receive barring indications based on the supported network type, allowing them to skip or bar communication with cells that are not compatible with their network type, thereby preventing inappropriate cell camping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE selects cells without network type barring indications, then cell selection flexibility is improved, but network compatibility and communication performance deteriorate due to inappropriate TN/NTN cell access
Solution Approach 1:
The patent segments the cell selection process by introducing separate barring indication bits for TN cells and NTN cells in system information blocks. This allows the network to selectively bar access for specific network types, enabling UEs to make appropriate cell selection decisions based on their supported network types, thus resolving the contradiction between selection flexibility and network compatibility.
Solution Approach 2:
The patent changes the parameters of cell access control by introducing new barring indication parameters (barredMIB and barredSIB1 bits) that specifically differentiate between TN and NTN cell access. This parameter differentiation allows the system to maintain flexibility in cell selection while ensuring reliability through network-type-appropriate access control.
2Reliability
If specific barring indication bits are added to MIB and SIB for NTN access control, then network compatibility is improved, but system complexity increases due to additional information elements
Solution Approach 1:
The patent applies universality by using existing system information block structures (MIB and SIB1) to carry both traditional cell barring information and new NTN-specific barring information. The same information blocks serve multiple functions: traditional access control and NTN/TN network type differentiation, thereby improving network compatibility without significantly increasing system complexity.
3Ease of operation
If UE attempts to access incompatible cells (TN UE accessing NTN cell or NTN UE accessing TN cell), then cell selection freedom is improved, but communication performance deteriorates due to suboptimal network access
Solution Approach 1:
The patent implements preliminary action by providing barring indications to UEs before they attempt cell access. The network预先 sets the barredMIB and barredSIB1 bits in system information, allowing UEs to determine in advance whether they can access a cell based on their supported network type. This prevents inappropriate access attempts and ensures optimal communication performance while maintaining ease of operation.
Data Source
AI summary
A UE may receive, from at least one cell via at least one bit in a MIB or a SIB, a barring indication based on a supported network of the at least one cell and a supported network of the UE. The supported network of the at least one cell may correspond to a TN or an NTN, and the supported network of the UE may correspond to a TN or an NTN. The UE may skip, based on the received barring indication, a selection of the at least one cell for communication. Accordingly, the UE may not camp on the at least one cell. The barring indication for NTN-supporting UEs and for TN-supporting UEs may be separately indicated via the MIB or the SIB.