Ascending data synchronization method for TDD system

A technology of time division duplex system and data synchronization, which is applied in the direction of communication between multiple stations, and can solve the problems of data link impact, impact on RRU, link collapse, etc.

Active Publication Date: 2009-07-01
TD TECH COMM TECH LTD
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Problems solved by technology

[0007] The problem with this method is that every time data passes through one level of RRU, the delay will increase by 5ms. If there are 6 levels of cascading in the system, the data of the last level of RRU will generate an additional 30ms time delay, so that the last level Due to the long processing delay of the RRU, the mobile phone cannot be connected, which is unacceptable for the TD system
[0009] The problem with this method is that the state of the subsequent level of RRU (for ex

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  • Ascending data synchronization method for TDD system
  • Ascending data synchronization method for TDD system
  • Ascending data synchronization method for TDD system

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[0037] In order to make the purpose, technical means and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0038] The basic idea of ​​the present invention is: in the system, it is guaranteed that the data sent by all RRUs arrives at the BBU with the same amount of delay time relative to the air interface time.

[0039] The overall process of the uplink data synchronization method provided by the present invention includes:

[0040] In step 1, the baseband pool BBU in the system sends a preset delay time amount to all remote radio units RRU to which the baseband pool belongs.

[0041] Step 2: All RRUs determine the data buffering time of the RRU according to the uplink transmission delay from the RRU to the BBU and the received delay time.

[0042] Step 3, all RRUs cache and send the received user data according to the determined data cache time of their own RRUs.

[0...

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Abstract

The invention discloses a method for synchronizing uplink data in a time duplex division (TDD) system. The method comprises the following steps: a base band unit (BBU) in the TDD system transmits a preset delay time quantum to all the radio-frequency remote radio units (RRUs) that share the BBU; all the RRUs determine the data cache time of each RRU according to the uplink transmission delay fromeach RRU to the BBU and the received preset delay time quantum; and all the RRUs cache and transmit the received user data according to the determined data cache time of each RRU. The method achievesthe effect of data synchronization of all the RRUs that share the same BBU in the TDD system and prevents the state interference among the RRUs.

Description

technical field [0001] The invention relates to a data synchronization technology in a communication system, in particular to an uplink data synchronization method in a time division duplex system. Background technique [0002] In the existing TD-SCDMA system, in order to reduce the occupied area of ​​the equipment room, the baseband processing unit and the radio frequency processing unit of the base station are set up in the way of optical fiber remote. Specifically, the baseband processing units are centrally arranged to form a baseband pool (BBU), the radio frequency processing unit is connected to the BBU through an optical fiber, and the remote radio frequency processing unit through the optical fiber is called a remote radio unit (RRU). figure 1 It is a typical connection schematic diagram of the cascaded application of BBU and RRU in the TD-SCDMA system. In the fiber-distance TD-SCDMA system, RRU1, RRU2 and RRU3 share the BBU, the direction in which data is sent from...

Claims

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Application Information

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IPC IPC(8): H04B7/26
Inventor 沈春胜王涛卢山金文华李蓉
Owner TD TECH COMM TECH LTD
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