D2D communication physical layer group key generation method based on base station control

Abstract

The invention discloses a method for generating a D2D communication group key based on a physical layer, which mainly solves the security problem of the D2D group communication under the control of a base station. The implementation steps are: 1) The user equipment participating in the group communication first generates a random phase, and generates a user detection signal based on the phase and sends it to the base station; 2) The base station measures the signal-to-noise ratio when using full-power transmission signals, and according to the signal-to-noise ratio Calculate the power allocation coefficient; 3) The base station estimates the phase of the received user sounding signal, generates the base station sounding signal according to the phase estimation value and the power allocation coefficient and sends it to the user equipment; 4) The user equipment interferes with the received base station sounding signal Eliminate and estimate the phase, and combine the random phase generated by 1) to calculate the group key. The invention reduces the interaction with the core network, reduces the load of the core network, can alleviate the signaling congestion caused by large-scale access, and can be used in the non-orthogonal multiple access NOMA communication environment of power multiplexing.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a method for generating an end-to-end D2D physical layer group key, which can be used in a NOMA communication environment of power multiplexing non-orthogonal multiple access. Background technique [0002] As an important way of future mobile communication, D2D communication has attracted more and more attention from the industry and academia, among which group communication is the main application scenario of D2D communication. NOMA is one of the key candidate technologies for 5G, and whether it can realize secure D2D group communication under this modulation mode is one of the determining factors whether it can be formally adopted by the 5G standard. Existing D2D security research mainly focuses on the link layer, and such solutions will cause signaling congestion in the core network during large-scale access. [0003] The paper "Collaborative Group Key Extraction ...

AI Technical Summary

Problems solved by technology

This scheme proposes the practical application method of generating the group key at the physical layer, but the key generation method based on the strength of the received signal has a low key generation rate, especially when the devices participating in the group communication remain static, it is difficult to achieve the required encryption. key generation rate

Using the key generation method based on signal strength, the quantization process is more complicated and the calculation complexity is higher

Without the participation of the base station in the key generation process, the security of the identity of the user equipment participating in the group communication is difficult to be authenticated

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