Method, device and system for covering tunnel in time division duplexing system

A technology of time-division duplex system and tunnel, which is applied in diversity/multi-antenna system, transmission system, communication between multiple stations, etc. It can solve the problems that the tunnel coverage requirements cannot be met and the downlink transmission power of single-channel signals is low.

Active Publication Date: 2009-04-29
DATANG MOBILE COMM EQUIP CO LTD +1
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0005] The problem with this method is that because the tunnel needs long-distance coverage, and the downlink transmission power of the single-channel signal is low, it cannot meet the actual tunnel coverage requirements.

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  • Method, device and system for covering tunnel in time division duplexing system
  • Method, device and system for covering tunnel in time division duplexing system
  • Method, device and system for covering tunnel in time division duplexing system

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Embodiment Construction

[0037] The existing tunnel coverage method cannot meet the actual tunnel coverage requirement because a single signal is used to cover the tunnel, and the downlink transmission power of the single signal is low. Even if the downlink transmission power of a single channel signal can be increased, the receiving sensitivity of the uplink signal cannot be improved in the uplink direction, and it is difficult to meet the tunnel coverage requirements.

[0038] The basic idea of ​​the present invention is to use two or even multiple output signals to cover the tunnel respectively, which can not only greatly increase the transmission power of the downlink signal, but also greatly increase the receiving gain of the uplink signal, thereby increasing the actual coverage distance and better satisfying Tunnel coverage requirements.

[0039] In order to enable those skilled in the art to better understand the present invention, the technical solutions provided by the present invention will ...

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Abstract

The invention discloses a method used for covering tunnels in a TDD system, comprising the steps as follows: a plurality of signals output by a remote radio frequency unit RRU are calibrated; two signals are selected out of a plurality of calibrated signals; the two signals are respectively used for covering tunnels. Two or more signals are used for covering tunnels, therefore, the emission power of the downlink signal can be greatly improved, the receiving gain of the uplink signal can be greatly improved, thus improving the practical coverage distance and meeting the coverage requirement better. The invention also provides equipment which is used for covering the tunnels in the TDD system, and a system which is used for covering the tunnels 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. figure 1 A method of overlaying a tunnel is shown. [0004] After the six output signals of the remote radio frequency unit (RRU) S11 are calibrated by th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/26H04B7/26H04B7/02H04B1/52
Inventor 高军王叶青莫莉蔡月民路成业孔健苏进喜
Owner DATANG MOBILE COMM EQUIP CO LTD
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