Large-scale terminal random access method based on conflict estimation

Abstract

The invention relates to a large-scale terminal random access method based on conflict estimation, which solves the problem of multi-user overload access under limited preamble resources, is suitable for the scene of burst transmission of scattered small data packets of a large number of machine type devices, and specifically comprises the following steps of: firstly, performing random access; a large-scale random access protocol with low signaling overhead and controllable user conflicts is designed; then, a multi-preamble combination random access competition scheme is provided; and finally, designing an efficient channel resource allocation scheme based on conflict estimation. According to the invention, on the premise that the number of orthogonal preambles is not increased, large-scale terminal random access conflicts are reduced, the access success probability of users is improved, and the multiple access capability of a cellular network is improved.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a large-scale terminal random access method based on collision estimation. Background technique [0002] With the vigorous development of mobile Internet, the number of wireless terminal devices and mobile data traffic are growing rapidly. Massive Machine Type Communication (mMTC) is one of the three main scenarios of the fifth-generation cellular communication. Its goal is to solve the problem of connection and communication of large-scale devices. It is currently widely used in smart medical, smart home, smart manufacturing and intelligent transportation. Different from Human-to-Human (H2H) communication, mMTC communication presents completely new features: 1) the upstream data packets are shorter; 2) the data traffic of each device is sporadic and bursty at any given time Only a small number of devices are active on the frequency and frequency; 3) The numbe...

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Problems solved by technology

[0004] In order to solve the problem of multi-user overload access under limited preamble resources and improve the utilization efficiency of wireless resources, the present invention proposes a large-scale terminal random access scheme based on collision estimation, which is suitable for sporadic small data packet bursts of a large number of machine-type devices. For transmission and transmission scenarios, the present invention can reduce random access conflicts of large-scale terminals without increasing the number of orthogonal preambles, improve the success probability of user access, and improve the multiple access capability of the cellular network

[0007] Step 1: Aiming at the problem of high signaling overhead of traditional four-step random access protocol and high user conflict rate, design a three-step random access protocol to reduce random access signaling overhead;

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