A distributed uplink multi-user random access method

Abstract

The invention provides a distributed uplink multi-user random access method, which belongs to the communication field. The method includes: a user having an access requirement randomly selects a pilot sequence from a set of pilot sequences and sends it to the base station, and initiates an access request to the base station; The associated offset adjustment standard adjusts its own offset accordingly. After adding the adjusted offset on the basis of its own signal power, it judges whether it can compete for the same pilot sequence according to the strong user decision criterion. The user who wins the competition resends the selected pilot sequence to the base station; the base station estimates the channel information to demodulate the user identification code according to the received secondary pilot information, and assigns a dedicated pilot to the successfully demodulated user resource. By adopting the present invention, it is possible to ensure that the user access to the base station is basically fair, and at the same time, the user access efficiency and conflict resolution probability are improved, and the access delay is reduced.

Description

technical field [0001] The present invention relates to the communication field, in particular to a distributed uplink multi-user random access method. Background technique [0002] Random access refers to the process in which the user sends a random access preamble, from trying to establish a connection with the base station to successfully transmitting signaling. It is the first step for the user to establish an uplink communication connection with the base station. It has two main purposes: The base station establishes an uplink synchronization relationship; the second is to request the base station to allocate uplink resources for data transmission. [0003] The traditional contention-based random access scheme means that users send randomly selected pilot sequences to the base station. When multiple users choose the same pilot sequence and pilot collision occurs, the base station centrally solves the problem of pilot collision. The goal is to minimize the probability o...

AI Technical Summary

Problems solved by technology

However, facing the communication needs of massive users, the problem of pilot collision becomes more and more obvious. The centralized method of base station to solve the pilot collision occupies too high bandwidth, resulting in long user access delay, low efficiency, and unfair access to the base station. And other issues

Therefore, the traditional centralized random access scheme for solving pilot conflicts can no longer meet the needs of massive user access scenarios, and it is urgent to propose a novel and efficient random access scheme

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