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Cell synchronizing method and device

A cell synchronization and secondary cell technology, applied in the field of communication, can solve problems such as undefined SCell uplink synchronization

Inactive Publication Date: 2011-10-19
CHINA ACAD OF TELECOMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it is not defined how to maintain uplink synchronization on SCell

Method used

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  • Cell synchronizing method and device

Examples

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Embodiment Construction

[0030] In the embodiment of the present invention, the base station judges whether the uplink TA of the SCell TA group needs to be adjusted according to the UE's uplink transmission on any SCell in the secondary cell timing advance group SCell TA group, and if necessary, the uplink TA of the SCell TA group The value is sent to the UE, instructing the UE to adjust the TA of the SCell TA group according to the relevant value of the TA, so as to realize the uplink synchronization of the SCell.

[0031] see image 3 In this embodiment, the method flow of cell uplink synchronization on the base station side is as follows:

[0032] Step 301: the base station judges whether to adjust the uplink TA of the SCell TA group according to the UE's uplink transmission on any SCell in the secondary cell timing advance group (SCell TA group).

[0033] Step 302: When the uplink TA of the SCell TA group needs to be adjusted, the base station determines the correlation value of the TA according ...

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Abstract

The invention discloses a cell synchronizing method for realizing synchronization of subsidiary cells. The method for a base station side comprises the following steps: a base station judges whether the uplink TA of a Scell TA group (subsidiary cell timing advance group) needs to be adjusted according to uplink transmission of UE (user equipment) on any Scell in the Scell TA group; when the uplink TA of the Scell in the Scell TA group needs to be adjusted, the base station determines the relevant value of the TA according to the uplink transmission on the Scell; and the base station transmits the relevant value of the TA to the UE. The method for a UE side comprises the following steps: the UE receives the relevant value of the TA of the Scell TA group transmitted by the base station; and the UE adjusts TA of the Scell TA group according to the received relevant value of the TA of the Scell TA group. The invention also discloses a device for realizing the method.

Description

technical field [0001] The present invention relates to the communication field, in particular to a cell synchronization method and device. Background technique [0002] The peak rate of LTE-A (LTE Advanced, upgraded long-term evolution) is much higher than that of LTE (long-term evolution), and it is required to reach 1Gbps downlink and 500Mbps uplink. At the same time, the LTE-A system requires good compatibility with the LTE system. The LTE-A system introduces a Carrier Aggregation (CA, Carrier Aggregation) technology based on the need to increase the peak rate, be compatible with the LTE system, and make full use of spectrum resources. The carrier aggregation technology refers to a mechanism in which a UE (user equipment) can simultaneously aggregate multiple cells (cells), and multiple cells can simultaneously provide data transmission services for the UE. Under carrier aggregation, the cell where the UE works is divided into a primary cell (PCell, Primary Cell) and s...

Claims

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Application Information

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IPC IPC(8): H04W56/00
CPCH04W56/0045
Inventor 赵亚利许芳丽
Owner CHINA ACAD OF TELECOMM TECH