Downlink data transmission method and apparatus

A downlink data transmission apparatus, comprising:

• a receiver configured to receive carrier aggregation (CA) capability indication information from a terminal device, wherein the CA capability indication information indicates to a network device that the terminal device supports a first-type intra-band non-contiguous (NC) CA combination on a first frequency band and a maximum downlink spectrum width supported by the terminal device;
• a processor coupled to the receiver and configured to determine, based on the CA capability indication information received by the receiver, a first CA combination from at least one first-type intra-band NC CA combination of the first frequency band, the first CA combination comprising at least two component carriers (CCs), wherein the at least two CCs comprise a license-free frequency band (B46 band), wherein the B46 band comprises a component carrier 1 (CC1), a component carrier 2 (CC2), a component carrier 3 (CC3), and a component carrier 4 (CC4), wherein the at least two CCs comprise a combination of two of the CC1, the CC2, the CC3, and the CC4, and wherein a spectrum width of the first CA combination is less than or equal to the maximum downlink spectrum width supported by the terminal device;
• and
• a transmitter coupled to the processor and configured to send downlink data to the terminal device using the first CA combination determined by the processor.

A downlink data transmission apparatus, comprising:

• a processor;
• and
• a transmitter coupled to the processor and configured to:
• send carrier aggregation (CA) capability indication information to a network device, wherein the CA capability indication information indicates to the network device that a terminal device supports a first-type intra-band non-contiguous (NC) CA combination on a first frequency band and a maximum downlink spectrum width supported by the terminal device;
• and
• receive downlink data from the network device using at least two component carriers (CCs), wherein the at least two CCs comprise a license-free frequency band (B46 band), wherein the B46 band comprises a component carrier 1 (CC1), a component carrier 2 (CC2), a component carrier 3 (CC3), and a component carrier 4 (CC4), wherein the at least two CCs comprise a combination of two of the CC1, the CC2, the CC3, and the CC4, and wherein a spectrum width of the first CA combination is less than or equal to the maximum downlink spectrum width supported by the terminal device.