Ciphered Random Access Preamble Index for Secure Paging
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Solution Overview
Problem
In wireless communication systems, the existing data transmission methods, such as LTE, face challenges in securing downlink data transmission during the early data transmission (EDT) process, particularly in machine type communication (MTC) and narrowband Internet of Things (NB-IoT) systems, where unauthorized devices can initiate data transmission, leading to incorrect data delivery.
Innovation Solution
The proposed solution involves ciphering and/or integrity protecting the random access preamble index using a security parameter, ensuring that only authorized devices can initiate the downlink early data transmission process, thereby preventing unauthorized access and ensuring secure data transmission to the correct terminal device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the paging message is broadcast to multiple terminal devices without security protection, then the coverage and accessibility of the downlink early data transmission process is improved, but the security of downlink data transmission deteriorates as unauthorized devices can initiate data transmission
Solution Approach 1:
The patent applies preliminary action by ciphering the random access preamble index before it is included in the broadcast paging message. This pre-security measure ensures that when the paging message is received by multiple terminal devices, only authorized devices can decode the protected index and initiate the downlink early data transmission process, thereby maintaining both wide coverage and transmission security
Solution Approach 2:
The patent introduces a security parameter as an intermediary element that mediates between the broadcast paging message and the terminal devices. The security parameter is used to cipher and integrity protect the random access preamble index, creating a secure layer that allows the paging message to be widely broadcast while preventing unauthorized access to the downlink data transmission process
2Device complexity
If the random access preamble index is transmitted in plaintext in the paging message, then the device complexity and processing overhead are reduced, but the security of the transmission deteriorates as unauthorized devices can steal and misuse the index
Solution Approach 1:
The patent applies preliminary action by performing ciphering and integrity protection on the random access preamble index before embedding it in the paging message. This pre-security processing adds a protective layer without significantly increasing the complexity of the overall system, as the security operations are integrated into the existing paging message generation process
Solution Approach 2:
The patent transforms the random access preamble index from a plaintext parameter to a ciphered and integrity-protected parameter. By changing the state of this parameter through security operations, the system maintains the simplicity of the paging message structure while significantly improving the security of the transmitted index
Data Source
AI summary
A data transmission method includes: A first access network device receives a first paging message from a core network device, where the first paging message includes a first security parameter. The first access network device sends a second paging message to a terminal device, where the second paging message includes a first random access preamble index that is ciphered and/or integrity protected by using the first security parameter. The first access network device receives a first random access preamble from the terminal device, and if the first random access preamble is a random access preamble indicated by the first random access preamble index, obtains downlink data of the terminal device. The first access network device sends the downlink data to the terminal device.