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 with an access requirement randomly selects a pilot sequence from a set of pilot sequences according to an access strategy broadcast by the base station and sends it to the base station, and initiates an access request to the base station; the base station obtains a pilot sequence according to the received pilot signal. Normalize the downlink pilot signal and broadcast it to the users in the cell as random access response information; the user who initiates the access request combines the received random access response information with its own signal power and the broadcast strategy of the cell , to judge whether it can win among the users who compete for the same pilot sequence, and the user who wins the competition resends the selected pilot sequence to the base station; the base station estimates the channel information and demodulates the user identification code according to the received secondary pilot information , and assign dedicated pilot resources to users who successfully demodulate. By adopting the present invention, efficient access of multiple users can be realized.

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 is the first step for a user to establish an uplink communication connection with a base station. It has two main purposes: one is to establish an uplink synchronization relationship with the base station; the other 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 of pilot collision, thereby increasing the number of users who successfully access the network. However, facing the communication needs of massive users, the problem of...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a distributed uplink multi-user random access method, which uses a distributed pilot conflict resolution strategy to transfer the pilot conflict problem to the user end, and each user judges whether it wins the competition instead of the base station Specify which user wins the competition by replying to the contention resolution message, which can significantly improve the access efficiency of multiple users in the cell, alleviate the performance loss caused by the centralized solution of pilot conflicts by the base station, improve the probability of conflict resolution, and reduce the user access delay , so as to realize the efficient access of multiple users

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