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: 2010-06-16
ZTE CORP
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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
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[0037] The basic idea of the present invention is that since the delay between the downlink input and uplink output ports of RRUs at all levels decreases as the distance between the RRU and the BBU increases, that is, the time delay of the RRU directly connected to the BBU is the largest. The cascading of stages reduces the delay in turn. Therefore, through the cooperation of BBU and RRU, the IQ data of RRUs at all levels are arranged in reverse order in the IQ data subframe, that is, the IQ data of the last level RRU is arranged at the beginning of the subframe, followed by the penultimate level 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, and there is no need to cache the entire subframe. Theoretically, the cache is no longer needed. Of course, if the system delay caused by the internal processing of the RRU or the possible calculation errors are considered in p...
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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 communication field, in particular to a communication method between a baseband pool unit and a remote radio unit in a TD-SCDMA system base station. Background technique [0002] The whole TD-SCDMA system consists of four parts: base station (Node B), radio network controller (RNC), core network system (CN) and user equipment (UE). With the development of radio frequency technology, the development of base station tends to The baseband signal processing and the mid-radio frequency processing are separated, and the mid-radio frequency part is pulled away through the optical fiber. In the base station, the main control part and 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, radio remote unit). One BBU can manage and control multiple RRUs. Now it has been proposed to cascade several RRUs t...
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IPC IPC(8): H04B7/26H04L1/00
Inventor 叶涛刘红军王红霞
Owner ZTE CORP