Two-step random access channel design and signal detection method in satellite scene

Abstract

The invention discloses a two-step random access channel design and signal detection method in a satellite scene, and belongs to the field of wireless communication. Firstly, each user generates a random access message msgA comprising a preamble and a payload, and when the user selects one preamble to send, the payload corresponding to the user and the time-frequency position of DMRS mapping are determined, and one-to-one mapping between the preamble of the user and a corresponding data part is realized. A plurality of users initiate uplink access to a satellite, a message msgA is sent to a satellite end, the sending end adopts power domain non-orthogonal multiple access, and a power distribution algorithm is adopted to distribute different powers to each user. And the satellite receivingend detects the users one by one according to the descending order of the power until the msgA data of each user is detected. And the satellite generates a message msgB according to the obtained information, sends the message msgB to the corresponding user and detects the access situation. According to the invention, when multiple users initiate two-step random access at the same time, correct detection of random access signals is ensured.

Description

technical field [0001] The invention belongs to the field of wireless communication, in particular to a two-step random access channel design and signal detection method in a satellite scene. Background technique [0002] In a wireless communication scenario, before the terminal communicates with the network, the uplink transmission time of the terminal is not synchronized with the network, and the terminal needs to adjust its sending frame timing to align with the uplink frame of the network, which requires the terminal to perform random access first. . [0003] As the first step for a terminal to connect to a network communication, random access is an important factor that affects whether the entire communication process can be established. The random access mechanism currently used in the satellite system is the traditional four-step random access scheme, that is, four messages are sent back and forth between the user and the satellite to establish a connection. The mess...

AI Technical Summary

Problems solved by technology

[0006] The present invention proposes a two-step random access channel design and signal detection method in a satellite scenario, aiming at the problem that the existing ground two-step random access channel design is faced with multi-antenna systems and cannot be applied to single-antenna port satellites , the present invention proposes a two-step random access channel design scheme based on terrestrial 5G technology and considering the characteristics of satellite scenarios; in view of the problem that data signals may collide when multiple users initiate two-step random access at the same time, a suitable The signal detection method of the channel design scheme

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