Distributed uplink multi-user random access method

Abstract

The invention provides a distributed uplink multi-user random access method, and belongs to the field of communication. The method comprises the following steps: enabling a user with an access requirement to randomly select a pilot sequence from a pilot sequence set and send the pilot sequence to a base station, and initiating an access request to the base station; enabling the user initiating theaccess request correspondingly to adjust the self offset according to the offset adjustment standard which is broadcast by the base station and associated with the proportional fairness index of theuser, and adding the adjusted offset on the basis of the self signal power; judging whether the users can compete for the same pilot frequency sequence or not according to a strong user judgment criterion, and retransmitting the selected pilot frequency sequence to the base station by the competed users; enabling the base station to estimate the channel information according to the received secondary pilot frequency information to demodulate the user identification code, and allocating the exclusive pilot frequency resources to the successfully demodulated user. By adopting the invention, theaccess efficiency and the conflict resolution probability of the user are improved while the basic fairness of accessing the base station by the user is ensured, and the access time 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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