Random access method

Abstract

The invention provides a random access method. The method comprises steps: orthogonal segmentation is carried out on bandwidth resources of a channel, a basic transmission unit for random access is obtained according to all users in a base station coverage range, and the information of the basic transmission unit is broadcasted to all users; a random access lookup table is initialized, and the information of the random access lookup table is broadcasted to all users; at a transmitting end of the channel, active users obtain channel transmitting signals according to the random access lookup table, the information of the basic transmission unit, the self channel state information and transmission requirements; and at the receiving end of the channel, the base station carries out detection and demodulation on the obtained basic transmission unit receiving signals and pilot signals corresponding to the basic transmission unit, and the number of the active users, the channel state information of the active users and the transmitting information of the active users can be obtained. The base station control and the user access for random access are simple and effective, and the multiple access technology approaching the channel capacity can be made full use of.

Description

technical field [0001] The invention relates to the field of multiple access technology for digital information transmission, in particular to a random access method. Background technique [0002] In a typical mobile communication system, a base station needs to communicate with multiple users within coverage. Among them, for the random access scenario of the uplink multiple access channel, the access control strategy of the base station, the coding and modulation scheme approaching the multi-user channel capacity domain, and the coding and modulation mode selection of the information sent by active users have not been well resolved , especially in the face of the dual requirements of user load rate and total transmission rate in the case of massive small packet burst business scenarios. [0003] Traditional uplink multi-user random access adopts the combined mode of contention channel and data channel, which usually requires signaling support. Each user first uses the con...

AI Technical Summary

Problems solved by technology

According to theoretical calculations, in the case of transmission failure caused by contention collisions, the channel resource utilization rate (specifically, the average user load rate) of the traditional slotted ALOHA protocol will not exceed 36.8%, and when the user load rate is high, the channel resource utilization rate will be further reduced, thereby affecting the performance, reliability and stability of the entire system; and, with the improvement of channel resource utilization, the probability of packet loss after user data collisions increases sharply, resulting in a large number of user information retransmission requirements

[0008] 3. When a user accesses a contention channel through the traditional slotted ALOHA protocol, the transmission rate of different users is usually the same, and the rate is low, which does not take into account the different channel conditions of different users

At the same time, due to the spread spectrum processing, the calculation amount of each user information bit increases sharply

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