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Frequency synchronization method and apparatus thereof

A frequency synchronization and frequency technology, applied in the direction of synchronization devices, electrical components, wireless communication, etc., can solve the problems of complex frequency offset estimation process in cooperative cells, reduce the amount of information interaction, simplify the frequency offset estimation process, and simplify the interaction process Effect

Active Publication Date: 2013-12-25
HUAWEI TECH CO LTD
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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a frequency synchronization method, which aims to solve the problem of complex frequency offset estimation process of coordinated cells in the prior art

Method used

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  • Frequency synchronization method and apparatus thereof
  • Frequency synchronization method and apparatus thereof

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Embodiment approach

[0064] Figure 5 A preferred implementation manner of step S301 of the present invention is shown, which is described in detail as follows:

[0065] Before the first base station notifies each second base station to feed back the second frequency offset to the first base station, the method further includes:

[0066] Step S501: the first base station acquires a reference signal measurement value of the second base station measured by a UE served by the first base station.

[0067] In the cooperating set cell, since some UEs may be served by one or more of cell 0, cell 1, cell 2... At this time, UE0 can respectively measure the reference signal measurement values ​​of the above-mentioned three cell base stations, and send corresponding reference signal measurement information to each serving cell base station, thus, each base station can obtain the UE served by it. The reported reference signal measurement information of the cell where the base station is located and neighbor...

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Abstract

The invention is suitable for the mobile communication field and especially provides a frequency synchronization method and an apparatus thereof. The method is characterized in that a first base station acquires a first frequency offset and informs a second base station to feed back a second frequency offset to the first base station; the first frequency offset is a frequency difference of the first base station and UE which is served by the first base station; a pilot signal sent by the UE which is served by the first base station is measured and acquired through the first base station; the second frequency offset is a frequency difference of a second base station and UE which is served by the first base station or the second base station; a pilot signal sent by the UE which is served by the first base station or the second base station is measured and acquired through the second base station; the first base station acquires a frequency difference of the first base station and the second base station according to the first frequency offset and the second frequency offset so that the second base station synchronizes a frequency of the second base station to be the same with a frequency of the first base station according to the frequency difference. By using the method and the apparatus of the invention, under the condition that an existing protocol does not need to be changed, a frequency offset estimation process of a cooperation cell is greatly simplified.

Description

technical field [0001] The invention belongs to the field of mobile communication, and in particular relates to a frequency synchronization method and device. Background technique [0002] Coordinate Multi-Point Joint Process / Joint Transmission (Coordinate Multi-Point Joint Process / Joint Transmission, CoMP JP / JT) is an important feature of Long Term Evolution (LTE) Rel10. For frequency division duplex (Frequency Division Duplexing, FDD) and time division duplex (Time Division Duplexing, TDD) modes, under the CoMP JT scheme, the issue of frequency synchronization between the cooperative base stations is the key. The simulation results show that when the frequency deviation of the two base stations is 65 Hz, the performance of the high-order Modulation Coding Scheme (MCS) has deteriorated significantly. Therefore, it is necessary to control the frequency deviation between the cooperative base stations. [0003] by figure 1 The frequency error diagram of two coordinated base ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00
CPCH04W56/0035
Inventor 易雄书
Owner HUAWEI TECH CO LTD
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