A data transmission method, baseband unit and remote radio frequency unit

Abstract

The embodiment of the present application discloses a data transmission method. When transmitting data between the BBU and the RRU, only the data of the effective downlink RBs and the data of the effective uplink RBs need to be sent, which can reduce the communication between the BBU and the RRU. The bandwidth used to transmit data, which in turn can reduce deployment costs and deployment difficulties. The method is applied to a communication system, and the communication system includes a baseband unit BBU and a remote radio frequency unit RRU. The method in the embodiment of the present application includes: the BBU receives multiple downlink user data; the BBU receives data from multiple downlink users; The data and the preset scheduling rules generate the data of the downlink effective RB; the BBU sends the data of the downlink effective resource block RB to the RRU, and sends the downlink effective RB indication information, and the downlink effective RB indication information is used for The RRU correspondingly fills the data of the effective downlink RBs into the set of idle RBs determined by the RRU.

Description

technical field [0001] The present application relates to the communication field, and in particular to a data transmission method, a baseband unit and a remote radio frequency unit. Background technique [0002] In existing wireless cellular communication systems, distributed base stations are currently one of the most important deployment forms. In a distributed base station, the remote radio unit (Remote Radio Unit, RRU) and the baseband unit (Baseband Unit, BBU) are generally interconnected through cables to implement the communication interface standard (Common Public RadioInterface, CPRI) between the baseband unit and the remote radio unit. ) signal connection. [0003] The fronthaul data transmission between the BBU and the RRU is carried out through the CPRI protocol. The amount of data transmitted on the CPRI is proportional to the air interface bandwidth supported by the cell and the number of receiving and transmitting antennas, and has nothing to do with the act...

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Problems solved by technology

[0003] The fronthaul data transmission between the BBU and the RRU is carried out through the CPRI protocol. The amount of data transmitted on the CPRI is proportional to the air interface bandwidth supported by the cell and the number of receiving and transmitting antennas, and has nothing to do with the actual traffic changes. (Multiple-Input Multiple-Output, MIMO) After the introduction of multiple antennas and large air interface bandwidth, the demand for CPRI bandwidth is huge, which brings about a significant increase in deployment costs and increased deployment difficulties.

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