Calibration method for intelligent antenna

Abstract

The present invention discloses a method for calibrating intelligent antenna. When a baseband pool unit (BBU) receives a request for establishing a cell carrier on a remote radiofrequency unit (RRU), the following steps are executed: A. determining whether the RRU is executed with initialization calibration, if the RRU is not executed with the initialization calibration, continuing for executing the step B, otherwise continuing for executing step C; B. executing initialization calibration to the RRU; C. establishing a corresponding cell carrier on the RRU according to the request for establishing cell carrier; and D. after the cell carrier is successfully established, executing a first periodic calibration to the corresponding cell carrier channel, and executing periodic calibration to the cell carrier channel according to the collocated calibrating period. The application of the invention can trigger the initialization calibration and periodic calibration in time for guaranteeing the service quality of wireless communication system.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a calibration method for a smart antenna. Background technique [0002] In the third-generation mobile communication system, smart antennas are widely used, and in the smart antenna technology, the calibration of the transmitting path and receiving path of the smart antenna is a key link. The calibration of the smart antenna can be divided into two steps: initial calibration and periodic calibration, also called pre-calibration and real-time calibration. The following sections of this document use the terms uniformly: initial calibration and periodic calibration. [0003] The initial calibration is mainly used to obtain the compensation coefficient of each antenna unit relative to the calibration antenna unit in the transmitting direction and receiving direction; the periodic calibration is to perform transmission calibration and reception calibration on each ante...

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Problems solved by technology

[0008] Since the periodic calibration is based on the carrier carried by the RRU, that is, the periodic calibration is for the carrier to provide services normally, and when to establish each carrier on the RRU depends on when the relevant radio network controller (RNC) initiates and communicates with the RRU The corresponding cells are established. However, in the existing periodic calibration scheme, the start time of periodic calibration is set by the operator through the OMC, which may cause the following problems in the periodic calibration of the RRU:

[0010] If the start time of the periodic calibration of the RRU is earlier than the establishment time of the carrier carried on the RRU, the parameters required for periodic calibration cannot be obtained, the periodic calibration cannot be performed normally, and the calibration results will not be available;

[0011] If the start time of periodic calibration of the RRU is much later than the establishment time of the carrier carried on the RRU, there will be no accurate antenna calibration results available for a long time after the carrier is established, and the carrier cannot carry services normally.

[0012] It can be seen from the above that the existing calibration methods for smart antennas cannot trigger initial calibration and periodic calibration in a timely manner, thus failing to guarantee the service quality of the wireless communication system

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