A method of transferring data

Abstract

Disclosed is a data transmission method. The data transmission method includes that a base station eNB receives data ahead of A sample points; after subjecting all the received data to medium radio frequency processing, the eNB estimates timing offset of received PRACH (physical random access channel) data to be Nta_PRACH; UE's first timing initial lead is determined according to the Nta_PRACH and a predetermined numerical value TAGuard set in a system, and the eNB transmits the UE's first timing initial lead to UE; the UE transmits the data according to the first timing initial lead; TAGuard point data transit is performed on other physical channels to compensate timing offset caused by the fact that the base station eNB receives the data ahead of TAGuard sample points; timing estimation is performed through uplink pilot signals, timing offset between the eNB and the UE is estimated, and second timing initial lead is calculated and is updated continuously. After the data transmission method is applied, the eNB can avoid intersymbol interference and achieve minimizing of the timing offset.

Description

technical field [0001] The present application relates to the technical field of communications, and more specifically, to a method for transmitting data. Background technique [0002] In the LTE system, after the user (UE) receiver is synchronized with the base station (eNB), the eNB estimates the initial timing advance (TA) through a random access process, and the eNB sends the initial TA value to the UE. The UE adjusts the time when data arrives at the eNB by setting the initial TA issued by the eNB. After that, the eNB needs to estimate TA through the pilot sequence, and constantly update the TA value, and send the value, so that the UE can adjust the time of sending data to achieve the purpose of time synchronization with the eNB. [0003] The eNB receives the preamble sequence of the UE. The preamble sequence is correlated with the local sequence, and the time delay is calculated according to the difference between the correlation peak and the target peak position wi...

AI Technical Summary

Problems solved by technology

In the uplink signal of LTE system, there are code-divided channels, such as PUCCH, SRS, etc., when these channels have timing deviation, the orthogonality of orthogonal codes will deteriorate with the increase of timing deviation, and the performance loss will be relatively large. Big

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