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Long term evolution (LTE) time adjustment method and base station

A time adjustment and base station technology, which is applied in the LTE time adjustment method and the base station field, can solve the problems of deteriorating uplink demodulation test signal performance, system throughput decline, and inaccuracy, so as to improve system throughput, improve accuracy, and avoid The effect of incorrect multiple adjustments

Inactive Publication Date: 2012-08-22
ZTE CORP
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Problems solved by technology

In the existing technology, when the uplink signal-to-noise ratio is high, the problem is not big, but at low signal-to-noise ratio, the measured instantaneous value becomes inaccurate because it is easily affected by noise and interference, and even the TA measured at adjacent time The results fluctuate in a wide range, so the adjustment of the time advance based on the existing technology will cause the base station to process the uplink received signal, and its Fourier transform (FFT) window contains the information of adjacent symbols, and the information between symbols will be introduced. Interference (ISI), which greatly deteriorates the performance of the uplink demodulation signal and reduces the system throughput

Method used

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  • Long term evolution (LTE) time adjustment method and base station
  • Long term evolution (LTE) time adjustment method and base station
  • Long term evolution (LTE) time adjustment method and base station

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Embodiment Construction

[0048] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0049] The embodiment of the present invention provides an LTE time adjustment method, and each step of the method is implemented by a base station, such as figure 1 As shown, the method includes steps:

[0050] S110. The base station starts the TA timer; in other embodiments, more specifically, the condition for starting the TA timer is: the user equipment completes the random access process, or the base station completes the timing advance adjustment command.

[0051] S120. Measure and record the instantaneous value of the time offset of the target user equipment;

[0052] In other embodiments,...

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Abstract

The invention relates to a long term evolution (LTE) time adjustment method and a base station. The LTE time adjustment method comprises the following steps of: starting a timing advance (TA) timer through the base station; measuring and recording a time bias instantaneous value of target user equipment; calculating a smooth time bias value of the target user equipment according to the time bias instantaneous value of the target user equipment; and transmitting a TA adjusting command before the TA timer is overtime according to the smooth time bias value of the target user equipment, and restarting the TA timer. Therefore, the precision and efficiency of TA adjustment are improved.

Description

Technical field [0001] The present invention relates to the field of wireless communication technology, in particular to an LTE time adjustment method and a base station. Background technique [0002] In the LTE (Long Term Evolution, Long Term Evolution) system, the Time Advance (TA) is used to characterize the timing deviation of the eNodeB (evolved NodeB, evolved base station) receiving the data sent by the UE (User Equipment, user equipment) Parameter. In order to maintain uplink synchronization, the eNodeB instructs the UE to send DMRS (Demodulation reference signal, uplink demodulation reference signal) or SRS (sounding reference signal) at a specified time point, and obtain TA through timing measurement. The eNodeB uses the physical downlink shared channel The time advance adjustment command is issued to the UE for adjustment to keep the uplink synchronization between the UE and the eNodeB. [0003] In LTE, the time advance adjustment command is relative to the current upli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00H04W88/08
CPCH04W56/0005H04W56/0055H04W92/10
Inventor 余秋星陈琼
Owner ZTE CORP
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