A two-step random access channel design and signal detection method in a satellite scenario

Abstract

The invention discloses a two-step random access channel design and signal detection method in a satellite scene, belonging to the field of wireless communication. First, each user generates a random access message msgA including a preamble and a payload. When the user selects a preamble to send, determine the payload corresponding to the user and the time-frequency position of the DMRS mapping, and realize the preamble and the payload of the user. Corresponds to a one-to-one mapping between data parts. Multiple users initiate uplink access to the satellite, and send a message msgA to the satellite terminal. The transmitting terminal adopts non-orthogonal multiple access in the power domain, and uses a power allocation algorithm to allocate different power to each user. The satellite receiving end detects each user one by one according to the order of power from large to small, until the msgA data of each user is detected. According to the obtained information, the satellite generates a message msgB and sends it to the corresponding user to detect the access situation. The invention ensures correct detection of random access signals when multiple users simultaneously initiate two-step random access.

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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