Physical layer key generation method and update method for one-to-one proximity communication

Abstract

The invention discloses a method for generating and updating a physical layer key for one-to-one proximity communication. A first mobile terminal sends a direct communication request to a second mobile terminal; the second mobile terminal receives the direct communication request sent by the first mobile terminal, And reply the direct security mode command to the first mobile terminal, the second mobile terminal analyzes its received signal at the physical layer, and uses the received signal as the received signal processed by the second mobile terminal; the first mobile terminal analyzes its own received signal at the physical layer The received signal of the first mobile terminal performs channel estimation calculation, and the result of the channel estimation calculation is multiplied by the transmission signal corresponding to the direct communication request to obtain the received signal processed by the first mobile terminal; the present invention only needs to write in the mobile terminal The software algorithm modules related to key generation such as quantization of initial key bits and key negotiation information generation do not need to modify the signaling process specified in the 3GPP standard protocol, and are compatible with related protocols of adjacent communication standards.

Description

technical field [0001] The invention belongs to the technical field of security protection of mobile communication systems, and in particular relates to a method for generating and updating a physical layer key for one-to-one proximity communication. Background technique [0002] Device-to-device (D2D) communication is a new communication technology, which has a wide range of applications in the Internet of Things and other fields. As early as the advent of 4G, 3GPP conducted in-depth research on D2D communication, and made it clear that "providing D2D communication" is an important communication service in mobile communication systems, and named this service Proximity Communication (ProSe). [0003] Proximity communication means that when two mobile terminals communicate at close distances, user data is directly transmitted on the wireless channel between the two mobile terminals without passing through the base station and the core network. The process of proximity commun...

AI Technical Summary

Problems solved by technology

However, the high computational complexity brought about by completing this process can only be borne by these two mobile terminals, which is a great challenge for mobile terminals with low power consumption and low complexity. With the advent of the 5G era, low The proposal of highly reliable time delay (URLLC) and massive machine-type communication (mMTC) scenarios requires mobile terminals to have the characteristics of low power consumption, low complexity, and high security. The above-mentioned security establishment process has been unable to meet such requirements.

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