In order to reduce the operating cost

the mobile company plans to build the base station C-RAN centralized networking

which poses a great challenge to the transmission bearer network. Combined with the current status of the mobile metropolitan transport network

the pre-transmission and backtransmission bearer schemes are analyzed

and a possible transmission network is proposed. Solution

in which C-RAN centralization will consume more fiber resources

in order to reduce the fiber consumption of C-RAN transmission access construction

it is proposed to use coarse wavelength division multiplexing technology

color light technology and other programs for research and practice.