Method, equipment and system for shrouding tunnel of TDD system

A time-division duplex system and tunnel technology, which is applied in communication between multiple stations, network planning, electrical components, etc., can solve the limitation of transmission power, reduce the coverage distance, and it is difficult to achieve the maximum gain effect by superimposing the power of two-way signals and other issues to achieve the effect of increasing the output power and increasing the coverage distance

Active Publication Date: 2009-04-22
CHINA MOBILE GROUP SHAIHAI +1
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Problems solved by technology

The problem with this method is: limited by the downlink transmission power of a single channel, it cannot meet the actual subway tunnel coverage requirements
[0006] The problem with this method is that since the phase relationship between the two signals is random, it is difficult for the superimposed power of the two signals to achieve the maximum gain effect, thereby affecting the actual downlink signal power output, thereby reducing the actual coverage distance

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  • Method, equipment and system for shrouding tunnel of TDD system
  • Method, equipment and system for shrouding tunnel of TDD system
  • Method, equipment and system for shrouding tunnel of TDD system

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Embodiment Construction

[0075] Although the existing method for tunnel coverage provides a method for calibrating the phase of the multiple output signals of the RUU, this method only considers the calibration of the multiple output signals of the RRU, and does not take into account the calibrated multiple output signals. The signal will still have a phase deviation in the subsequent transmission and combination, and this deviation cannot be compensated by periodic calibration. As a result, the actual downlink signal power output is affected, thereby reducing the actual coverage distance.

[0076] The basic idea of ​​the present invention is to calibrate the phases of RRU multi-channel output signals according to the phase deviation generated by signal transmission and combination, so as to increase the output power of the actual downlink signal and further increase the actual coverage distance.

[0077] In order to enable those skilled in the art to better understand the present invention, the techn...

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Abstract

The invention discloses a method for covering a tunnel in a TDD system, which includes the steps: RRU multipath output signals are combined into a single signal; the signal formed through combination is used for covering the tunnel and is partially fed back to the RRU; and the RRU calibrates the multipath output signals according to the signals which are fed back. The method has the technical scheme that the signal used for covering the tunnel can be partially coupled and fed back to the RRU, thus the RRU can calibrate the phase positions of the output signals according to the phase jitters generated by the transmission and the combination of the signals so as to realize the purpose of increasing the output power of the actual downlink signals and to increase the actual covering distance.The invention also provides equipment and a system which are used for covering the tunnel in the TDD system.

Description

technical field [0001] The present invention relates to a time division duplex (TDD) system, in particular to a method, device and system for covering tunnels in the TDD system. Background technique [0002] When networking a mobile communication system in a tunnel, it is generally not recommended to install active devices inside the tunnel, such as power amplifiers and optical fiber remote units, for reasons of safety and convenience for operation and maintenance. Since active equipment cannot be installed, the signal cannot be amplified by an active amplifier. Since the tunnel is generally longer, a longer feeder is required, which requires a higher transmission power of the information source. [0003] At present, when the TDD system is used to cover the tunnel, the remote baseband macro base station is usually used. [0004] figure 1 A method of overlaying a tunnel is shown. In this method, one output signal of a remote radio frequency unit (RRU, Remote RF Unit) S11 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04W16/26
Inventor 阴启明路成业孟忻高军段滔莫莉郭全成刘之浩许剑萍郑诗豪
Owner CHINA MOBILE GROUP SHAIHAI
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