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Method, system and apparatus for frequency offset transmission and frequency offset precalibration

A transmission method and frequency calibration technology, applied in electrical components, wireless communication and other directions, can solve problems such as performance degradation and inability to obtain frequency offsets in target cells, and achieve the effect of improving link performance

Inactive Publication Date: 2010-12-29
CHINA ACAD OF TELECOMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Embodiments of the present invention provide a method, system, and device for frequency offset transmission and frequency offset pre-calibration, which are used to solve the problem that in the prior art, the target cell to which the terminal switches cannot obtain the frequency offset in the source cell before the terminal switches, and the The problem that the performance drops sharply after the source cell is switched to the target cell

Method used

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  • Method, system and apparatus for frequency offset transmission and frequency offset precalibration
  • Method, system and apparatus for frequency offset transmission and frequency offset precalibration
  • Method, system and apparatus for frequency offset transmission and frequency offset precalibration

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Embodiment 1

[0073] see image 3 , in this embodiment, the base station of the source cell and the base station of the target cell belong to the same RNC, and the specific process is as follows:

[0074] Step 30: After the terminal establishes a connection with the source cell base station (NodeB_S), the RNC sends an uplink frequency offset dedicated measurement report request (Dedicated Measurement Initiation Request) to the NodeB_S;

[0075] Step 31: NodeB_S returns an uplink frequency offset dedicated measurement report response message (Dedicated Measurement Initiation Response) to the RNC;

[0076] Step 32: NodeB_S regularly sends an uplink frequency offset dedicated measurement report (Dedicated Measurement Report) to the RNC according to the set period, and the uplink frequency offset dedicated measurement report carries the estimated frequency offset information (Frequency Offset Estimation, FOE) of the terminal;

[0077] Step 33: RNC decides to switch the terminal to the target c...

Embodiment 2

[0082] see Figure 4 , in this embodiment, the base station of the source cell and the base station of the target cell belong to different RNCs, and the specific process is as follows:

[0083] Step 40: After the terminal establishes a connection with the source cell base station (NodeB_S), the source RNC (RNC_S) sends an uplink frequency offset dedicated measurement report request (Dedicated Measurement Initiation Request) to the NodeB S;

[0084] Step 41: NodeB_S returns an uplink frequency offset dedicated measurement report response message (Dedicated Measurement Initiation Response) to RNC_S;

[0085] Step 42: NodeB_S regularly sends a dedicated measurement report (Dedicated Measurement Report) to RNC_S according to the set period, and the dedicated measurement report carries the estimated frequency offset information (Frequency Offset Estimation, FOE) of the terminal;

[0086] Step 43: RNC_S decides to switch the terminal to the target cell base station (NodeB_T), and N...

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Abstract

The embodiment of the invention discloses a method for frequency offset transmission and frequency offset precalibration, which comprises the steps that: a source cell base station reports estimated frequency offset of a terminal to network control equipment to which the source cell base station belongs; the network control apparatus transmits the received frequency offset to a target cell base station to which the terminal is switched; or, the source cell base station transmits the estimated frequency offset of the terminal to the target cell base station to which the terminal is switched; and after the terminal is switched to the target cell base station, the target cell base station performs frequency offset precalibration of the terminal according to the frequency offset. The embodiment of the invention further discloses a system and an apparatus for frequency offset transmission and frequency offset precalibration. With the method, the target cell can acquire the frequency offset, at source cell, of the terminal to further perform the frequency offset precalibration on data of the terminal according to the frequency offset and then transmits the data at rated carrier frequency, thereby effectively enhancing link performance after the terminal performs cell switching.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a frequency offset transmission and frequency offset pre-calibration method, system and equipment. Background technique [0002] When the terminal moves relative to the base station, a Doppler frequency shift will occur. The size of the Doppler frequency shift is related to the speed of the terminal movement, and the angle between the direction of the terminal movement and the direction of the incident wave. The Doppler frequency shift f d is defined as follows: [0003] f d = v c × f h × cos ( θ ) [0004] v is the moving speed of the terminal, c is the propagation speed of light in free space, θ is the angle between the moving direction of the terminal and the incident wave, f h is the car...

Claims

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Application Information

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IPC IPC(8): H04W36/32H04W88/08
Inventor 罗斐琼桑东升周海军张英胡海静
Owner CHINA ACAD OF TELECOMM TECH