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

A downlink data and antenna port technology, applied in the field of base station cell synchronization, can solve the problems of not allowing loopback detection channels, long distances, and inability to apply, and achieves the effect of avoiding delay uncertainty and ensuring the synchronization relationship.

Active Publication Date: 2009-07-22
SHANGHAI HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 discloses a method for keeping the downlink data synchronization of each antenna port of the same base station, comprising: RE rebuilding the RE according to the received CPRI frame and the delay time of the CPRI frame sent from the REC timing reference point to the RE timing recovery reference point. BFN timing reference; REC indicates the time when the downlink data arrives at the antenna port of the RE while sending the downlink data to the RE; RE reconstructs the BFN timing reference, send the downlink data, so that the time when the data arrives at the antenna port is the specified time. The method of the invention guarantees the synchronous relationship between the cells of the same base station at the antenna port, and avoids the delay uncertainty of downlink data transmission inside the 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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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26
Inventor 夏迎九
Owner SHANGHAI HUAWEI TECH CO LTD
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