ACCESS NETWORK SYSTEM, TRANSPORT METHOD, AND RELATED APPARATUS

Embodiments of this application disclose an access network system, a transmission method, and a related device, to reduce access network devices on a backhaul access ring, and improve efficiency of managing and controlling service data by the access ring. At least one first access network device and at least two second access network devices are included, where the first access network device includes a first baseband unit BBU, and the second base station includes a second baseband unit BBU. At least one first baseband unit BBU and at least two second baseband units BBUs are connected in series to form a closed loop. The second baseband unit BBU is configured to determine a bandwidth requirement of the second access network device. The first baseband unit BBU is configured to: obtain, from a plurality of second baseband units BBUs, bandwidth requirements of second access network devices corresponding to the second baseband units BBUs, and determine a bandwidth available to each second access network device.