Method and system for data transmission among Ir interfaces of double-module base station

Abstract

The invention discloses a method and system for data transmission among Ir interfaces of double-module base station. The method comprises the steps that IQ modulation data to be transmitted are adjusted to an expected target value by adopting an AGC factor, are compressed according to a compression ratio and then are transmitted. An AGC module in the system is used for adjusting the IO modulation data to be transmitted to the expected target value by adopting the AGC factor. Through the adoption of the method and system for the data transmission among the Ir interfaces of the double-module base station, bandwidth occupied by data transmission between a BBU and an RRU is reduced, optical fiber occupied amount is reduced, and network deployment cost is lowered.

Description

technical field [0001] The present invention relates to the field of optical fiber data transmission between a base band unit (BBU, Base Band Unit) and a radio frequency unit (RRU, Radio Remote Unit) of mobile communication, in particular to a method and system for data transmission between Ir interfaces of a dual-mode base station. Background technique [0002] At present, wireless communication equipment generally adopts the remote baseband mode of BBU+RRU, and the interface between the BBU and the RRU is called an Ir interface. For example, baseband remote mode, such as 3G Time Division Synchronous Code Division Multiple Access (TD-SCDMA, Time Division-Synchronous Code Division Multiple Access) and 4G Time Division Long Term Evolution (TD-LTE, Time Division Long Term Evolution) , the base stations are deployed in a distributed manner, and the BBU and RRU are directly connected through optical fibers. The advantage of this deployment is that the BBU can be placed in the e...

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Problems solved by technology

However, this deployment also brings two problems: First, high-speed orthogonal modulation (IQ) data needs to be transmitted between the BBU and the RRU, which requires high bandwidth. TD-LTE8 antenna 20MHz single carrier requires 9.8304Gbps transmission bandwidth, which consumes a lot of Fiber resources between the BBU and RRU, and with the use of broadband RRU, such as 40M bandwidth RRU, this bandwidth demand will increase exponentially

The 6.144G optical module that is widely used now requires two pairs of optical fiber transmission. Even if a 10G optical module is used, two pairs of optical fiber transmission are required in a dual-mode scenario, and the cost increases.

[0006] (2) Insufficient use of optical fiber: in the existing technical solutions, a pair of two-core optical fibers is required to transmit and receive data. Each optical fiber only transmits one-way data, that is, each optical fiber can only receive or transmit. figure 2 As shown, since each fiber can only receive or transmit, the transmission bandwidth of the fiber is not fully utilized

The limitation is the rate of 6.144Gbps optical module, and the transmission bandwidth of the optical fiber itself is not fully utilized

[0007] (3) In actual engineering construction, for the construction of remote base stations, if the optical fiber demand of the Ir interface is relatively large, it will cause bottlenecks in transmission line pipeline resources in local areas, making it difficult to implement the project and increasing construction costs.

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