An uplink data transmission method for cascaded RF remote unit

A technology of remote radio unit and data transmission method, which is applied in the field of communication, can solve the problems that RRU cannot calculate data offset independently, RRU cannot know, and RRU interferes with each other, so as to improve stability, ensure high efficiency, and ensure link Effect

Inactive Publication Date: 2008-04-30
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the insertion position is confused, the cascaded RRUs will interfere with each other, affecting normal services
However, RRUs at all levels cannot know which level they are on the HDLC link, and RRUs cannot independently calculate the offset of their respective data in the 10ms frame

Method used

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  • An uplink data transmission method for cascaded RF remote unit
  • An uplink data transmission method for cascaded RF remote unit
  • An uplink data transmission method for cascaded RF remote unit

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Embodiment Construction

[0037] The basic idea of ​​the present invention is that the delay between the downlink input and uplink output ports of the RRUs at all levels decreases as the distance between the RRU and the BBU increases, that is, the delay of the RRU directly connected to the BBU is the largest, and then every Cascading, the delay is reduced in turn. Therefore, through the cooperation of the BBU and the RRU, the IQ data of the RRUs at all levels are arranged in the reverse order in the IQ data subframe, that is, the IQ data of the last stage of RRUs are arranged at the beginning of the subframe, followed by the penultimate stage. The data of the RRU, and finally the data of the first-level RRU. In this way, each level of RRU can directly insert its own data into the correct position without buffering the entire subframe. In theory, the cache is no longer needed. Of course, if the system delay caused by the internal processing of the RRU or the error that may be generated in the calculati...

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Abstract

The invention discloses an uplink data transmission method of a cascade remote RF unit (RRU), which ensures the interdependence of the uplink data of each RRU and saves caching. Through the cooperative work of BBU and RRU, the invention exchanges respective information thereof, and eventually calculates out the deviation of the IQ data thereof in a data frame for each cascade of RRU, and configures the deviation to the RRU as the configuration parameters. The method includes the following steps: the RRU calculates out the time delay from a downlink input interface to an uplink output interface, and the time delay refers as Toffset; when the uplink transmits data, the RRU determines the time of the Toffset plus the conclusion of the uplink data frame as the starting time of data transmission; when the starting time comes, the invention inserts an uplink data package to be transmitted into the uplink data frame.

Description

technical field [0001] The invention relates to the field of communication, in particular to a communication method between a baseband pool unit and a remote radio unit in a base station of a TD-SCDMA system. Background technique [0002] The entire TD-SCDMA system consists of four parts: base station (Node B), radio network controller (RNC), core network system (CN) and user equipment (UE). The baseband signal processing and the mid-RF processing are separated, and the mid-RF part is pulled away through optical fibers. In the base station, the main control part and the baseband processing part are called BBU (BaseBand Unit, baseband pool unit), and the digital intermediate frequency processing and radio frequency part are called RRU (RadioRemote Unit, remote radio unit). One BBU can manage and control multiple RRUs. Now it has been proposed to cascade several RRUs together in a chain-like manner, and use optical fibers to connect with the BBU to realize the sending and rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04L1/00
Inventor 叶涛刘红军王红霞
Owner ZTE CORP
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