Random access method and device

Abstract

The invention provides a random access method and a device. According to one embodiment of the invention, the base station configures a plurality of targeting sequencing subgroups according to a predetermined condition, and configures at least one targeting sequencing for each of the targeting sequencing subgroups; targeting sequencing configuration information is broadcasted to each user device, and the targeting sequencing configuration information includes information related to each of the targeting sequencing subgroups; the user device, according to the received targeting sequencing configuration information and a communication bandwidth supported by the user device, selects a corresponding targeting sequencing subgroup, and selects randomly one targeting sequencing from the targeting sequencing subgroups and sends the one targeting sequencing to a base station; the base station, according to the received targeting sequencing, determines the communication bandwidth supported by the user device; and the base station and the user device carry out subsequent communication on the communication bandwidth supported by the user device. The random access method can easily and effectively support the communication of the narrowband user device in a comparably great system bandwidth, so that the application of the narrowband user device is widened.

Description

technical field [0001] The present invention relates to a communication system, in particular to a random access method and device. Background technique [0002] Machine Type Communication (MTC) is a newly introduced item in the Long Term Evolution LTE system. Today, many operators have shown increasing interest in machine type communication. [0003] For the current 3GPP LTE system, preambles are transmitted on six resource blocks in the central frequency band of the system bandwidth, so the base station can receive preambles from various user equipments without difficulty. However, for the message sent by the base station, such as a random access response, there is no limit to the communication bandwidth used to transmit the message, which can appear anywhere in the entire system bandwidth, and at this time the base station does not know the user The communication bandwidth supported by the device. On the other hand, narrowband user equipment, such as MTC user equipment...

AI Technical Summary

Problems solved by technology

On the other hand, narrowband user equipment, such as MTC user equipment, supports a limited communication bandwidth, such as 1.4MHz, so the narrowband user equipment may not be able to receive messages from the base station, thereby failing to complete the access process

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