A communications method performed by a base station, the method comprising: • determining whether there is a quasi-co-location, QCL, relationship between a first logical antenna port of a first serving cell among two serving cells of a serving cell group and a second logical antenna port of a second serving cell, different to the first serving cell, among the two serving cells, wherein the first serving cell corresponds to a first component carrier, CC, and the second serving cell corresponds to a second CC different to the first CC, wherein the first logical antenna port corresponds to at least one physical antenna port and the second logical antenna port corresponds to at least one physical antenna port, wherein the serving cell group is a group predefined according to a preset rule or is a group obtained after the base station groups serving cells allocated to a user equipment, UE; • when the base station determines that there is the QCL relationship between the first logical antenna port and the second logical antenna port: ∘ sending QCL indication signaling used to indicate that there is the QCL relationship between the first logical antenna port and the second logical antenna port to the UE (step 401), wherein the determining whether there is the QCL relationship between the first logical antenna port and the second logical antenna port comprises: ∘ determining the QCL relationship based on a carrier frequency spacing between the first CC and the second CC, wherein the carrier frequency spacing is a carrier frequency spacing between the first CC and the second CC in a carrier aggregation, and the determining the QCL relationship based on the carrier frequency spacing between the first CC and the second CC comprises: ▪ if the first CC and the second CC are continuous in the frequency domain, determining that there is the QCL relationship between the first logical antenna port and the second logical antenna port; ▪ if the first CC and the second CC are discontinuous in the frequency domain, determining that there is no QCL relationship between the first logical antenna port and the second logical antenna port. • determining whether there is a quasi-co-location, QCL, relationship between a first logical antenna port of a first serving cell among two serving cells of a serving cell group and a second logical antenna port of a second serving cell, different to the first serving cell, among the two serving cells, wherein the first serving cell corresponds to a first component carrier, CC, and the second serving cell corresponds to a second CC different to the first CC, wherein the first logical antenna port corresponds to at least one physical antenna port and the second logical antenna port corresponds to at least one physical antenna port, wherein the serving cell group is a group predefined according to a preset rule or is a group obtained after the base station groups serving cells allocated to a user equipment, UE; wherein the first serving cell corresponds to a first component carrier, CC, and the second serving cell corresponds to a second CC different to the first CC, wherein the first logical antenna port corresponds to at least one physical antenna port and the second logical antenna port corresponds to at least one physical antenna port, wherein the serving cell group is a group predefined according to a preset rule or is a group obtained after the base station groups serving cells allocated to a user equipment, UE; • when the base station determines that there is the QCL relationship between the first logical antenna port and the second logical antenna port: ∘ sending QCL indication signaling used to indicate that there is the QCL relationship between the first logical antenna port and the second logical antenna port to the UE (step 401), ▪ if the first CC and the second CC are continuous in the frequency domain, determining that there is the QCL relationship between the first logical antenna port and the second logical antenna port; ▪ if the first CC and the second CC are discontinuous in the frequency domain, determining that there is no QCL relationship between the first logical antenna port and the second logical antenna port.