Channel correction method, channel mutual correction method, device and system

Abstract

Provided are a correction method for channels, and a mutual correction method, device and system for channels. The correction method for channels comprises: conducting downlink digitization processing on a correction sequence received from an RRU; sending the sequence after the downlink digitization processing to a BBU, so as to enable the BBU to calculate correction coefficients corresponding to all sending channels of the RRU based on a predetermined sending channel reference sequence according to the sequence after downlink digitization processing; conducting uplink digitization processing on the correction sequence received from the BBU; and sending the sequence after the uplink digitization processing to the RRU, so as to enable the RRU to return the received sequence after the uplink digitization processing to the BBU, and enable the BBU to calculate correction coefficients corresponding to all receiving channels of the RRU based on a predetermined receiving channel reference sequence according to the sequence after the uplink digitization processing returned by the RRU. The embodiments of the present invention are high in channel correction accuracy.

Description

technical field [0001] The present invention relates to communication technology, in particular to a channel correction method, a channel mutual correction method, device and system. Background technique [0002] Coordinated Multiple Point (COMP) technology was introduced in Long Term Evolution (LTE for short), which improves throughput through coordinated transmission of base stations, especially for users at the cell edge, thereby improving cell edge coverage and enhancing user experience. In a communication system using COMP technology, the base station side can include a base band unit (Base Band Unit, referred to as BBU), and each BBU can be connected to multiple remote radio frequency units (Remote Radio Unit, referred to as RRU), and one RRU corresponds to one cell. When the COMP communication system implements Joint Transmission (JT for short) performance, the BBU can control multiple RRUs to transmit downlink signals to the same user equipment through inter-cell co...

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Problems solved by technology

[0004] In the inter-calibration phase, the RRU exchanges channel information between itself and the other party through the air interface or other means, which will inevitably introduce connection or air interface noise, and due to the time-varying nature of the analog channel, phase noise will also be introduced, which will affect the channel The results of joint calibration

In particular, when the two interacting RRUs are in a non-co-sited state (that is, the two interacting RRUs are the RRUs of the two base stations), the various noises on the interactive channel will increase significantly, which will bring a negative effect on the channel correction. There are more uncertainty factors, resulting in a significant reduction in the accuracy of the channel joint calibration results

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