Method, equipment and terminal for establishing uplink synchronization in multi-cell long-term evolution system

Abstract

The invention discloses a method, equipment and terminal for establishing uplink synchronization in a multi-cell long-term evolution system, wherein the method can be used for reducing the control channel spending of the system, increasing the resource utilization rate, shortening the waiting time required for performing uplink and downlink data transmission between the terminal and a base station and guaranteeing the service normal operation. The method for establishing the uplink synchronization in the multi-cell long-term evolution system, provided in the embodiment of the invention comprises the following steps: the base station sends an activating / deactivating command to the terminal so as to inform the terminal to initiate a random access process on an appointed secondary cell in activated secondary cells while activating one or more secondary cells in a terminal TA (Timing Advance) group, wherein an random access command is carried in the activating / deactivating command; and, after the appointed secondary cell is activated, the terminal instantly executes the random access process of the appointed secondary cell and the base station according to the received random access command so as to establish the uplink synchronization.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method for establishing uplink synchronization in a multi-cell long-term evolution system, a network device and a terminal. Background technique [0002] The Third Generation Partnership Project (The Third Generation Partner Project, 3GPP) proposed new functions such as carrier aggregation in Release 10, which can support user equipment (User Equipment, UE) to simultaneously perform uplink and downlink data transmission on multiple cells , to obtain a higher peak rate through a larger bandwidth (for example, the maximum bandwidth can reach 100MHz). [0003] A UE can be configured to work in a primary cell (Primary Cell, PCell) and several secondary cells (Secondary Cell, SCell) at the same time, and each cell it works in can contain one downlink component carrier, zero or one uplink component carrier, This multi-cell operation may also be called carrier ...

AI Technical Summary

Problems solved by technology

[0007] In the existing mechanism, the activation of the secondary cell and the initiation of random access need to be implemented by two independent signalings, resulting in more wireless resources to be occupied and low resource utilization; and the activation of the secondary cell Finally, the random access process can only be initiated after the network response time and the PDCCH command delivery time, resulting in a long delay from activation to uplink synchronization of the secondary cell, and the UE and the base station need to wait for a long time The corresponding secondary cell can be used to transmit uplink and downlink data. This delay may affect the normal operation of the service. When the network environment is poor, it may even cause service interruption, resulting in poor user experience.

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