Uplink synchronization method and uplink synchronization system in multi-carrier communication system
A technology of multi-carrier communication and line synchronization, applied in the directions of synchronization devices, wireless communication, electrical components, etc., can solve problems such as data loss, and achieve fast, simple and effective methods
Inactive Publication Date: 2012-10-31
ZTE CORP
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Therefore, when the UE is in the RRC connection state, sending uplink data on some cells that have not completed uplink synchronization will cause data loss
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[0053] The basic idea of the present invention is: when it is necessary to add a secondary cell (cell to be aggregated) for the UE, the network side first needs to instruct the UE to be in a state of receiving downlink messages in the cell to be aggregated through the current serving cell of the UE, Then send resources for random access, such as a random access preamble, to the UE, so that the UE completes the random access process in the secondary cell to be added. The network side then uses the random access response to indicate the uplink synchronization indication time (TA) for the UE to perform uplink synchronization on the secondary cell to be added, so that the UE completes uplink synchronization on the secondary cell to be added.
[0054] In order to better understand the present invention, the technical solution of the present invention is further described in detail.
[0055] The definition of two states is given in the present invention:
[0056] State 1: The ser...
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The invention discloses an uplink synchronization method in a multi-carrier communication system. The uplink synchronization method comprises the following steps of: indicating UE (User Equipment) to be in a state capable of receiving downlink information in a cell to be aggregated by a network side according to a current serving cell of the UE; sending uplink synchronization indicating time information of the uplink synchronization to the UE after the random access of the UE in the cell to be aggregated is finished by the network side; and normally carrying out uplink and downlink data receiving and sending after the uplink synchronization of the uplink synchronization indicating time information is finished in the cell to be aggregated by the UE. The invention simultaneously discloses an uplink synchronization system in the multi-carrier communication system. According to the uplink synchronization method and the uplink synchronization system, disclosed by the invention, the uplink synchronization of an auxiliary cell in an LTE (Long Term Evolution)-Advanced system is realized, and the method is simple and quick.
Description
technical field [0001] The present invention relates to an uplink synchronization technology, in particular to an uplink synchronization method and system of a secondary cell in a multi-carrier communication system. Background technique [0002] The Long Term Evolution Advanced (LTE-Advanced, Long Term Evolution Advanced) system is an organization of the 3rd Generation Partnership Project (3GPP, the 3rd Generation Partner Project) in order to meet the requirements of the International Telecommunication Union (ITU, International Telecommunication Union), Advanced International Mobile Telecommunications (IMT -Advanced, International Mobile Telecommunication-Advanced) requirements. The LTE-Advanced system is an evolved version based on the Long Term Evolution (LTE, Long Term Evolution) system. It introduces many new technologies to meet the high-speed transmission requirements of IMT-Advanced. The most important of the introduced technologies is Carrier aggregation technology....
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IPC IPC(8): H04W56/00H04W74/08
CPCH04W74/0833H04L5/001H04W56/0005
Inventor 万璐黄亚达陈中明
Owner ZTE CORP