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Method for holding every antenna port downlink data synchronization of the same base station

A technology of downlink data and each antenna, which is applied in the field of base station cell synchronization, can solve the problems of not allowing loopback detection channels, long distances, and inapplicability, so as to achieve the effect of ensuring synchronization relationship and avoiding delay uncertainty

Active Publication Date: 2006-12-20
SHANGHAI HUAWEI TECH CO LTD
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  • Abstract
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Problems solved by technology

[0005] This solution requires that a dedicated timing reference loopback detection channel must be established between REC and RE. However, the CPRI protocol does not define a similar loopback channel between REC and RE, and the actual distance between REC and RE may be far away. , are often connected through optical fibers, and a separate loopback detection channel is not allowed, so in this case, the above solution cannot be applied

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  • Method for holding every antenna port downlink data synchronization of the same base station
  • Method for holding every antenna port downlink data synchronization of the same base station
  • Method for holding every antenna port downlink data synchronization of the same base station

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Considering that in the base station system using the CPRI protocol, the data interaction between the REC and the RE is realized through the continuous exchange of CPRI frames, so the idea of ​​the present invention is: firstly use the CPRI frame sent by the REC to the RE to reconstruct the two Synchronized timing reference, and then based on the synchronous timing reference, REC specifies the time when the downlink data arrives at the RE antenna port when sending downlink data to RE, so that the downlink data sent by REC arrives at the RE antenna keep in sync.

[0029] According to the CPRI protocol, the control field of the CPRI frame exchanged between REC and RE in the base station includes the frame number (BFN) of Node B and the hyperframe number (HFN) of CPRI, and the frame period of a BFN is 10 milliseconds (ms) , each ...

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Abstract

The invention relates to a method for keeping the descending data synchronous of each antenna port in one base station, which comprises: RE, based received CPRI frame and the delay time that sending CPRI frame from the REC timed reference point to the RE timed return reference point, builds the BFN timed reference of RE; REC builds the time that said descending data reaches the RE antenna port when sending descending data to RE; RE, based on said time, and the rebuilt BRF timed reference, sends out the descending data, to make the time that the data reaches antenna port as the appointed time. The invention can confirm the synchronization between the antenna ports of each region of one base station, to avoid the descending data transmission delay inside REC.

Description

technical field [0001] The invention relates to base station cell synchronization technology, in particular to a method for keeping the downlink data synchronization of each antenna port of the same base station when the common public radio interface (CPRI) protocol is adopted. Background technique [0002] In a wideband code division multiple access (WCDMA) system, the delay time of the wireless frame timing of each cell of the same base station (NodeB) is an integer multiple of 256Tc, and Tc is a cycle of a chip (Chip). The inaccuracy of radio frame timing in different cells will affect the performance of mobile phones searching cell synchronization channels (SCH channels) and positioning services. In order to support the transmit diversity function, the deviation of the two branches of transmit diversity in a cell is required to be within a small range, for example: WCDMA stipulates that the deviation range is within 1 / 4Tc, which puts forward a higher requirement for down...

Claims

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Application Information

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IPC IPC(8): H04B7/26
Inventor 夏迎九
Owner SHANGHAI HUAWEI TECH CO LTD
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