Method and system for transmitting signal based on remote radiofrequency (RF) units

Abstract

The invention discloses a method and system for transmitting a signal based on remote RF units. The method for transmitting the signal sends information to a receiving terminal through a first remote RF unit and a second remote RF unit which are adjacent and within the transmitting area of the same base station, and comprises the following steps that the first remote RF unit sends the informationto the receiving terminal at a first moment; and the second remote RF unit also sends the information to the receiving terminal at the first moment, and sends the information again to the receiving terminal at a second moment after a preset period of time. The system and method for transmitting the signal can achieve the effect of reducing signal fading by adopting one of two adjacent RRUs withinthe same base station area to send the same information signal twice and making use of the signal sent for the second time to ensure that the signal received by the terminal has a direct current of higher power.

Description

technical field [0001] The present invention relates to the field of wireless communication technology, in particular to a signal transmission method based on BBU (Base Band Unit, baseband processing unit) + RRU (Radio Remote Unit, remote radio frequency unit) station layout method applied in high-speed scenarios and system. Background technique [0002] As my country's railway speeds up, it is an urgent need for the TD-SCDMA system to support normal communication in high-speed mobile scenarios. [0003] The station arrangement method of Shanghai maglev train track--BBU+RRU station arrangement method is a typical optimized method for base station arrangement in a high-speed mobile environment. The characteristics of the BBU+RRU station arrangement method include: linear station arrangement, BBU and RRU Separation, two RRUs belonging to the same cell send the same signal at the same time with equal power. Compared with the traditional base station, the BBU+RRU station deploy...

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Problems solved by technology

In addition, since the fading usually lasts the transmission time of 1 chip, it is about 234 meters long for TD-SCDMA. Considering that the current reference distance between two RRUs is usually 1500 meters, the fading is still in actual communication. It cannot be ignored. Therefore, some corresponding anti-fading algorithms must be adopted in the BBU+RRU station deployment method, otherwise the normal service of the receiving terminal 300 cannot be guaranteed.

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