Private Cell Access via Public Sync Signals
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Solution Overview
Problem
Current wireless communication systems face challenges in hiding network presence and operation, particularly in enhanced security implementations where unauthorized devices can detect private or hidden networks by receiving unprotected synchronization messages.
Innovation Solution
User equipment (UE) detects hidden networks by receiving synchronization messages from public cells, using preconfigured functions to derive control resources for private cells, and decrypts system information using cell-specific broadcast keys, thereby minimizing detection by unauthorized devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If private cells broadcast unprotected synchronization messages to enable UE access, then UE can detect and access hidden networks, but unauthorized devices can also detect private network presence
Solution Approach 1:
The patent segments synchronization message transmission by separating public cell broadcasts (unencrypted, for UE discovery) from private cell system information (encrypted, for authorized access). This allows authorized UEs to detect private networks through public cell sync messages while preventing unauthorized devices from accessing private network details.
Solution Approach 2:
The patent introduces a public cell as an intermediary between unauthorized devices and private cells. The public cell broadcasts synchronization messages that authorized UEs can use to locate private cells, while the private cells themselves remain hidden from unauthorized devices through encrypted system information.
2Reliability
If private cells broadcast encrypted system information, then network security is enhanced, but authorized UEs cannot access the network without proper keys
Solution Approach 1:
The patent applies preliminary action by pre-provisioning authorized UEs with cell-specific broadcast keys before network access is needed. This allows UEs to decrypt private cell system information once they have located the cells through public cell synchronization messages, ensuring both security and authorized access.
Solution Approach 2:
The patent implements local quality by assigning different message protection levels to different cell types: public cells broadcast unencrypted synchronization messages for discovery, while private cells broadcast encrypted system information for secure access. This differentiated approach ensures security where needed while maintaining accessibility where appropriate.
3Object-affected harmful factors
If multiple private cells are hidden within public cell coverage, then network presence is concealed, but UE must derive control resources for multiple cells
Solution Approach 1:
The patent applies universality by using a single public cell synchronization message as the foundation for deriving control resources for multiple private cells. The UE uses the same public cell sync information input to functions that generate control resources for different private cells, reducing complexity compared to deriving resources independently for each hidden cell.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive synchronization messages from a public cell that indicates synchronization information. The UE may input information received from the one or more synchronization messages into one or more functions provisioned at the UE to derive a set of control resources associated with a private cell. The UE may monitor the set of control resources to receive encrypted system information from the private cell. The UE may decrypt the system information of the private cell by deriving a cell specific broadcast key associated with the private cell. In some examples, the UE may derive the cell specific broadcast key based on the one or more functions provisioned at the UE. As such, the UE may transmit to the private cell via the set of control resources a random access message indicating successful decryption of the system information.