Random access method, device and user equipment

Abstract

The invention provides a random access method, a random access device and user equipment. The method includes the following steps that: a system message sent by a base station is received on the default sub-band of a serving cell where user equipment is located, wherein the system message contains the random access configurations of a plurality of sub-bands of the serving cell and the applicable bandwidth thereof; preambles are selected from the random access resources of sub-bands corresponding to random access configurations of which the applicable bandwidth is lower than or equal to the bandwidth capability of the user equipment; on the sub-bands corresponding to the selected preambles, the preambles are sent to the base station according to the random access configurations of the sub-bands; and a random access response fed back by the base station is received on the sub-bands corresponding to the selected preambles. With the random access method, the random access device and the user equipment of the invention adopted, the load balance of random access can be realized; and a problem that an intelligent terminal cannot access a network smoothly due to the access of a large number of low-cost terminals to the network can be avoided.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a random access method, device and user equipment. Background technique [0002] When a UE (User Equipment, user equipment) accesses the network, it needs to initiate random access to obtain uplink synchronization. The UE in the connected state also needs to initiate random access in some scenarios. For example, when the uplink is out of sync, if the UE has uplink data to transmit, the UE needs to send contention based random access (Contention based Random Access Procedure); when When the uplink is out of sync, if the base station needs to send data to the UE, the base station can trigger the UE to perform contention or non-contention random access through physical downlink control signaling; after the UE sends scheduling requests reaching the preset threshold times, if the base station still No uplink scheduling grant (UL Grant) is sent to the UE, and th...

AI Technical Summary

Problems solved by technology

[0008] The random access method, device, and user equipment provided by the present invention can realize random access load balancing, and at the same time avoid the problem that smart terminals cannot smoothly access the network caused by a large number of low-cost terminals.

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