A communications method for use in a power system comprising a distribution grid and a communications system, comprising: determining a first frequency band and a second frequency band in an operating frequency band, wherein the first and second frequency bands are authorized to the power system; and transmitting a first-type frame in the first frequency band, and transmitting a second-type frame in the second frequency band, wherein the first-type frame is used to carry a first-type service, the second-type frame is used to carry a second-type service, and the second-type frame and the first-type frame have different frame structures, wherein the first-type service is a distribution automation service and the second-type service is an online monitoring service for the distribution grid; wherein the first-type frame comprises a first indication information used to indicate a range of the first frequency band; and/or the second-type frame comprises a second indication information used to indicate a range of the second frequency band; wherein the method further comprises: dynamically adjusting ranges of the first frequency band and the second frequency band based on a service requirement of the first-type service and/or an obtaining status of a spectrum resource, wherein sensitivity of the first-type service to a transmission latency is higher than sensitivity of the second-type service to a transmission latency, and a frame length of the first-type frame is less than a frame length of the second-type frame and a width of each OFDM subcarrier in the first frequency band is greater than a width of each OFDM subcarrier in the second frequency band. determining a first frequency band and a second frequency band in an operating frequency band, wherein the first and second frequency bands are authorized to the power system; and transmitting a first-type frame in the first frequency band, and transmitting a second-type frame in the second frequency band, wherein the first-type frame is used to carry a first-type service, the second-type frame is used to carry a second-type service, and the second-type frame and the first-type frame have different frame structures, wherein the first-type service is a distribution automation service and the second-type service is an online monitoring service for the distribution grid; wherein the first-type frame comprises a first indication information used to indicate a range of the first frequency band; and/or the second-type frame comprises a second indication information used to indicate a range of the second frequency band; wherein the method further comprises: dynamically adjusting ranges of the first frequency band and the second frequency band based on a service requirement of the first-type service and/or an obtaining status of a spectrum resource, wherein sensitivity of the first-type service to a transmission latency is higher than sensitivity of the second-type service to a transmission latency, and a frame length of the first-type frame is less than a frame length of the second-type frame and a width of each OFDM subcarrier in the first frequency band is greater than a width of each OFDM subcarrier in the second frequency band.