Secure System Information Delivery Using Cell-Specific Scrambling
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Solution Overview
Problem
Existing wireless communication systems, particularly in 5G and beyond, are vulnerable to malicious entities intercepting or generating false system information (SI) due to the broadcast nature of physical cell identities, which can deceive UEs into connecting to unauthorized base stations, exposing sensitive information.
Innovation Solution
Implementing a security context shared between the network and registered UEs to derive cell-specific parameters for securing SI delivery, using hash functions with cell identity, synchronization signal frequency, and system frame number to scramble and protect downlink channels, ensuring only valid UEs can decode the protected information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If system information is broadcast using physical cell identity, then coverage and accessibility are improved, but security and authenticity are worsened
Solution Approach 1:
The patent segments system information into two parts: a first portion that can be accessed by all UEs (including those without security context) and a second portion that requires security verification. This segmentation allows broad accessibility while protecting critical information, resolving the contradiction between ease of access and security authenticity.
Solution Approach 2:
The patent implements preliminary security setup where UEs receive security context during registration with a first cell before accessing information from a second cell. This preliminary action establishes authentication credentials in advance, enabling secure SI delivery while maintaining accessibility for legitimate UEs.
2Reliability
If security parameters are implemented for SI protection, then security is improved, but device complexity is worsened
Solution Approach 1:
The patent applies partial security action by protecting only the second portion of system information that requires authentication, while leaving the first portion unprotected for broad access. This selective approach provides necessary security without imposing excessive complexity on the entire SI delivery mechanism.
Solution Approach 2:
The patent introduces security context as an intermediary element that mediates between the network and UEs. This security context, established during registration, serves as a credential that simplifies subsequent authentication processes while maintaining strong security, reducing the complexity burden on both network and UE devices.
Data Source
AI summary
Various aspects of the present disclosure relate to techniques for secure delivery of system information (SI). A user equipment is configured to receive a first set of security parameters during registration with a first cell, receive first SI associated with a second cell, and monitor a physical downlink control channel (PDCCH) for second SI associated with the second cell based at least in part on the first set of security parameters.