Example antenna port configuration methods and apparatuses are provided. One example method includes obtaining, by an access network device, M reference signal received power RSRP differences, where the M RSRP differences indicate radio signal strengths of N radio remote units RRUs, and both M and N are positive integers greater than 1. Based on the M RSRP differences, the access network device can determine an order of traversing the N RRUs. For any RRU of the N RRUs, the access network device can configure same antenna ports for two RRUs in the traversal order that are adjacent to the RRU, and can configure different antenna ports for the RRU and the RRUs adjacent to the RRU.