China Mobile talks about 5G pre-transmission technology selection: semi-active OpenWDM solution has obvious advantages


C114 News July 4th news (Zhang Hailong) During the MWC19 Shanghai, the smart optical network innovation forum sponsored by Fiberhome Communications, Li Wei, deputy director of the China Mobile Research Institute Network and IT Technology Institute, said that it is geared towards 5G pre-transmission, semi-active The Open-WDM solution is an optimized solution that considers fiber saving, low cost, and controllability. China Mobile hopes that the joint partners will accelerate the maturity and application of the Open-WDM system.
Li Wei said that the 5G prequel network model is undergoing major changes. At present, the main body of China Mobile’s existing network is the D-RAN architecture, and one BBU is connected to 1-3 base stations. The 5G main body is a C-RAN architecture, and one DU is connected to 6-10 base stations. To this end, China Mobile is considering introducing WDM to adapt to the forward demand.
In order to meet the 5G prequel demand, China Mobile proposed the Open-WDM solution. According to Li Wei, the Open-WDM solution is a semi-active system, which mainly includes AAU color light module, AAU side passive wavelength division multiplexer, and DU side active WDM equipment, forming a pre-transmission network with unified control. It reduces fiber resource requirements and has the ability to manage and control.
Li Wei believes that the new Open-WDM solution is conducive to the division of maintenance interface and management domain between wireless and transmission; it is conducive to procurement specialization, centralized procurement and configuration of optical modules; facilitating maintenance flexibility, low-cost OAM mechanism .
At the same time, Li Wei believes that the 5G pre-transmission network’s demand for large-core fiber requires a new pre-transport network architecture, namely 5G C-RAN network architecture, which requires Open-WDM to adapt to different application requirements.
According to Li Wei, after applying Open-WDM, the aggregation and access can greatly reduce the deployment cost and fiber resource requirements. For example, the number of base stations in the integrated service aggregation room is about 10-30, the transmission distance exceeds 1KM, and the required fiber is 360. After Open-WDM, the number of fibers can be reduced to 30; in the service aggregation room, the fiber can be used. The number has been reduced from 120 to 10 fibers; the number of fibers can be reduced from 36 to 3 in the access room.
In terms of operation and maintenance, due to the new front-end network architecture, the interface between the wireless network system and the pre-transmission network system is re-divided, which requires a new operation and maintenance method.
Li Wei believes that Open-WDM enhances the pre-transmission network operation and maintenance compared with the traditional operation and maintenance. The changes are mainly reflected in four aspects. One is to divide the pre-transmission network management domain into two parts: wireless and transmission; second, the point-to-point pre-transmission network. Need to simplify management; third, no need for complex protection functions, need to simplify the protection function in specific scenarios; Fourth, the Open-WDM architecture in the division to purchase optical modules.

Tags : 5gChina MobileNetwork Architectureoptical fiberOptical module