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Data transmission method and data transmission system

A data transmission method and frequency domain data technology, applied in the direction of digital transmission system, transmission system, multi-frequency code system, etc., to achieve the effect of reducing CPRI bandwidth and CPRI rate

Inactive Publication Date: 2014-01-29
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the above data transmission process, the CPRI between the baseband processing and the mid-RF processing transmits time-domain data fixedly. Once the system bandwidth and sampling rate are determined, the CPRI bandwidth is also fixed.

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  • Data transmission method and data transmission system

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Embodiment Construction

[0038] The technical solutions in the invention will be clearly and completely described below in conjunction with the description and drawings of the invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0039] Embodiments of the present invention provide a data transmission method and system for data transmission between a BBU and an RRU, especially frequency domain data transmission in CPRI. By implementing this embodiment, the CPRI rate can be significantly reduced, and the communication system can dynamically adjust the CPRI bandwidth according to the load and usage of frequency resources, thereby effectively reducing the CPRI bandwidth.

[0040] The CPRI in the prior art transmits time-domain ...

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Abstract

An embodiment of the invention discloses a data transmission method and a data transmission system which are used for data transmission between a BBU (base band unit) and an RRU (remote radio unit) and especially for frequency domain data transmission in CPRI (common public radio interface). The method includes that the BBU transmits frequency domain data of an MIMO (multiple input multiple output) coding to the RRU through the CPRI via multiple antennas; the RRU receives the frequency domain data transmitted by the BBU through the CPRI; the RRU performs OFDM (orthogonal frequency division multiplexing) symbol generating processing on the frequency domain data received by the CPRI so as to enable the frequency domain data to be converted into time domain data. By the data transmission method, speed of the CPRI can be remarkably decreased, a CPRI bandwidth can be dynamically adjusted by a communication system according to use condition of load and frequency resources, and accordingly the CPRI bandwidth can be lowered.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a data transmission method and system. Background technique [0002] The LTE (Long Term Evolution, long-term evolution plan) network uses a large number of distributed base station architectures. The distributed base station architecture combines the BBU (Base Band Unit, baseband processing unit) and RRU (Remote Radio Unit, radio remote unit) in the traditional macro base station Separated, the BBU and the RRU are generally connected by optical fibers, and a unified CPRI (Common Public Radio Interface, public open radio interface) standard is defined. [0003] Currently, the BBU in the distributed base station architecture mainly performs baseband processing, and the RRU mainly performs mid-radio frequency processing. See figure 1 In the data transmission process shown, the BBU first performs baseband processing on the downlink channel, and the RRU then p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L1/00H04L1/06
CPCH04L27/26H04L5/0023H04L1/00H04L27/2626H04L27/2647H04L5/143H04L1/0045H04L1/0041H04L27/2649H04L5/1423H04L27/2627
Inventor 刘云
Owner HUAWEI TECH CO LTD
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