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Method for realizing transmitter diversity using two remote RF units

A technology of remote radio frequency unit and transmit diversity, which is applied in the direction of diversity/multi-antenna system and communication between multiple stations, and can solve problems such as no implementation method

Inactive Publication Date: 2007-09-19
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the BBU-RRU architecture system, usually considering the cost and technical difficulty of implementation, an RRU generally only supports single-antenna transmission
How to use two RRUs to realize the transmit diversity function, that is, how to realize the synchronous transmission of the two antennas of the two RRUs, has not yet been realized.

Method used

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  • Method for realizing transmitter diversity using two remote RF units
  • Method for realizing transmitter diversity using two remote RF units
  • Method for realizing transmitter diversity using two remote RF units

Examples

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Embodiment Construction

[0027] When a cell supports transmit diversity, the BBU will transmit two downlink IQ channel data to the RRU, one of which is the IQ channel data of the main set and the other is the IQ channel data of the diversity set. These two IQ channel data are in the BBU The outputs are fully synchronous.

[0028] The BBU transmits the signal to the RRU through the optical fiber. Because the RRU needs to go through different lengths of optical fibers and cascaded to reach the RRU, it will inevitably cause different delays. Moreover, due to the different manufacturing processes and implementation technologies adopted by the RRU, the delay of its downlink channel is also different. Not the same. Therefore, the present invention compensates the downlink delay on the RRU, so as to meet the requirement that the time difference of the signals on the antenna ports of the two RRUs does not exceed a certain length of time.

[0029] Below in conjunction with accompanying drawing and specific em...

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Abstract

The invention discloses a method of transmit diversity realized through two distal rf units comprising the following procedures: a. the time length needed to be compensated of the two rf units RRU is calculated by the baseband unit; b. BBU configurate the time parameter needed to be compensated to each RRU; c. RRU conducts descending time delay compensation according to the time delay parameter configurated by BBU. The invention can realize the transmit diversity function on the two RRU connected with the same BBU, and can also configurate casually two RRU to realize the transmit diversity function according to the needs of users and automatically realizes the measurement compensation of time delay through software, therefore reducing the workload of the hardware for debugging and calibration.

Description

technical field [0001] The invention relates to a BBU (Base Band Unit, base band unit) and an RRU (Remote Ratio Unit, remote radio frequency unit) of a wireless communication system, especially a method for realizing transmit diversity by using two RRUs. Background technique [0002] In recent years, the development of wireless communication system architecture has gradually evolved into such a trend: separate the BBU from the RRU, and connect the BBU to multiple RRUs through long-distance transmission means (such as optical fibers, cables), and then place the radio frequency unit in the Everywhere you need it. This architecture improves the flexibility of networking on the one hand, and reduces the maintenance cost of the network on the other hand. Therefore, this architecture is more and more recognized by users, and there are more and more application occasions. In recent years, this architecture has been written into certain industry standards, such as OBSAI and CPRI s...

Claims

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Application Information

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IPC IPC(8): H04B7/02H04B7/26
Inventor 赵国峰
Owner ZTE CORP
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