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

A time-division duplex system and tunnel technology, which is applied in the radio relay system and communication between multiple stations, can solve the problems of inability to meet the tunnel coverage requirements and low downlink transmission power of single-channel signals

Inactive Publication Date: 2009-04-29
DATANG MOBILE COMM EQUIP CO LTD +1
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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.

Method used

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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

[0034] 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.

[0035] 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.

[0036] 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 present invention discloses a method for covering tunnels in a TDD system. The method comprises steps of selecting two paths of signals from multiple paths of signals output from a remote-end radio-frequency unit (RRU) and using the selected two paths of signals to cover the tunnels. By adopting the two paths of signals or even more paths of signals to cover the tunnels, not only the downlink signal transmitting power is improved greatly, but also the uplink signal receiving gain is greatly improved. Therefore, real cover distance is increased and tunnel cover requirement is satisfied preferably. The present invention also provides a device for covering tunnels in a TDD system and a system for covering tunnels in a 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] From the six output signals of the remote radio frequency unit (RRU) S11, one signal is select...

Claims

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Application Information

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IPC IPC(8): H04B7/14H04B7/26
Inventor 高军王叶青莫莉蔡月民路成业孔健苏进喜邹素玲任世岩
Owner DATANG MOBILE COMM EQUIP CO LTD
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