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Data transmission method and device

A data transmission method and narrowband data technology, which are applied in the field of data transmission methods and devices, can solve problems such as the inability to transmit narrowband data in CPRI basic frames, and achieve the effect of flexible IQ data sampling rate and improved transmission bandwidth

Active Publication Date: 2021-10-19
HYTERA COMM CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This application provides a data transmission method and device to solve the problem in the prior art that the CPRI basic frame cannot be used to transmit narrowband data

Method used

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  • Data transmission method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0077] Taking the CPRI interface rate as 9.8304Gbps as an example, the PDT service data is transmitted in the Fast C&M, and the LTE (Long Term Evolution, Long Term Evolution) data is transmitted in the IQ DataBlock part.

[0078] For PDT, it is assumed that IQ data with 2 antennas, 2 carriers, and no field strength needs to be transmitted:

[0079] PDT single IQ data sampling rate (32bit): Fs=76.8khz;

[0080] The chip rate of each basic frame of CPRI: Fc=3840khz;

[0081] The number of bytes contained in the control word of each basic frame of CPRI: such as 9.8304Gbps, Ny=128bit / 8=16;

[0082] Chip rate of 1 / 4 superframe: Fc / 64=60khz;

[0083] The sampling rate (32bit) of the control word part of 1 / 4 superframe: (Ny / 4)*(Fc / 64)=(Ny*Fc) / 256=240khz;

[0084] Number of narrowband antenna carriers A×C: Na=antenna number x carrier number x(1+field strength number*i)=4, i=0;

[0085] Narrowband A×C sampling rate (32bit): Na*Fs=307.2khz;

[0086] In each 1 / 4 superframe, the numb...

Embodiment 2

[0094] Taking the CPRI interface rate as 9.8304Gbps as an example, TETRA service data is transmitted in Fast C&M.

[0095] For TETRA, it is assumed that 4 antennas, 4 carriers, and IQ data with field strength need to be transmitted:

[0096] TETRA single IQ data sampling rate (32bit): Fs=230.4khz;

[0097] The chip rate of each basic frame of CPRI: Fc=3840khz;

[0098] The number of bytes contained in the control word of each basic frame of CPRI: Ny=16;

[0099] Chip rate of 1 / 4 superframe: Fc / 64=60khz;

[0100] The sampling rate (32bit) of the control word part of 1 / 4 superframe: (Ny*Fc) / 256=240khz;

[0101] Number of narrowband antenna carriers A×C: Na=antenna number x carrier number x(1+field strength number*i)=32, i=1;

[0102] Narrowband A×C sampling rate: Na*Fs=7372.8khz;

[0103] In each 1 / 4 superframe, the number of Fast C&Ms that need to be used:

[0104] Ncm=ceil[(Na*Fs) / (Ny*Fc / 256)]=ceil[(256Na*Fs) / (Ny*Fc)]=31;

[0105] For the remaining 44-Ncm=13 lines, the ...

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Abstract

The invention discloses a data transmission method and device. The data transmission method comprises the following steps: when constructing a common public radio interface superframe, mapping narrowband data to a rapid control management connection part of a control word part of the common public radio interface superframe; and transmitting the generic public radio interface superframe over a generic public radio interface. According to the data transmission method provided by the invention, the narrowband data can be transmitted by using the rapid control management connection part of the common public radio interface superframe, so that the transmission bandwidth of the data is improved.

Description

technical field [0001] The present application relates to the technical field of data transmission, in particular to a data transmission method and device. Background technique [0002] Under the general trend of broadband and narrowband integration, CPRI (Common Public Radio Interface, Common Public Radio Interface) needs to transmit broadband and narrowband data at the same time. The traditional method is to use the IQ DataBlock part in the CPRI basic frame to transmit broadband data and narrowband data at the same time. However, the amount of broadband data is often large. If it is necessary to transmit 8-antenna single-carrier 20M bandwidth data, or 20M bandwidth 4-level 2-antenna RRU cascaded IQ data, the broadband data will occupy the entire bandwidth of the IQ DataBlock, and no other data can be transmitted. space to transmit narrowband data. Contents of the invention [0003] The present application provides a data transmission method and device to solve the prob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06
CPCH04L69/26H04L69/06Y02D30/70
Inventor 谢喆杨小刚李沛
Owner HYTERA COMM CORP
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