Random access method for base station and user equipment

Abstract

A base station and a random access method of user equipment are disclosed. The method comprises the following steps: during configuration of carrier aggregation for user equipment, sending carrier aggregation configuration information to the user equipment through an RRC (Radio Resource Control) connection reconfiguration signal, wherein the configuration information includes information of a first secondary cell sending random access response and an sTAG (Timing Advance Group) to which a secondary cell receiving random access response on the first secondary cell belongs; when RRC connection reconfiguration completion information sent by the user equipment is received, sending an activation order for activating the secondary cell belonging to the sTAG to the user equipment so the user equipment can monitor a downlink control instruction sent by the secondary cell belonging to the sTAG; and sending a random access trigger signal to the user equipment so the user equipment can initiate random access on the secondary cell belonging to the sTAG and receive random access response on the common search space of the first secondary cell. Through the scheme, the load of a primary cell during carrier aggregation can be reduced.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a random access method of a base station and user equipment. Background technique [0002] Carrier Aggregation (CA) is a technology introduced in the Long Term Evolution-Advanced (LTE-Advanced) system to increase the transmission bandwidth in order to meet the requirements of single-user peak rate and system capacity improvement. When the service requires, the base station will configure carrier aggregation for the user equipment (UE) in the connected state. The user equipment in the carrier aggregation state can simultaneously use the resources of multiple component carriers to achieve the purpose of high data transmission rate. [0003] In carrier aggregation, the user equipment has a primary cell (Primary Cell, PCell), and the user equipment obtains layer 3 control signaling such as system messages and paging messages from the primary cell, and other cells are ...

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Problems solved by technology

[0004] In the prior art, when the number of component carriers when carrier aggregation is configured for user equipment is large, the load of the primary cell may be overloaded, because the secondary cell belonging to the sTAG needs to initiate random access to obtain timing advance after activation, and random The access response is sent by the primary cell, which will lead to a heavy load on the primary cell to process random access, which will lead to the inability to successfully activate the secondary cell belonging to the sTAG

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