Communication method, communications node, and system

A communication apparatus configured for use as a donor base station, the communication apparatus comprising:

• a processor;
• and
• a memory configured to store computer readable instructions that, when executed by the processor, cause the communication apparatus to provide execution comprising:
• sending, after performing radio link control layer function processing and adaptation function processing, downlink data to a terminal device by using at least one relay node, wherein
• the downlink data sent to the terminal device includes at least one of:
• information about an identifier of the terminal device, information about an identifier of the at least one relay node, information about an identifier of a quality of service flow QoS flow, information about an identifier of a protocol data unit session, information about an identifier of a radio bearer of the terminal device, or information about an identifier of a logical channel of the terminal device.

A communication apparatus configured for use as a terminal device, the communication apparatus comprising:

• a processor;
• and
• a memory configured to store computer readable instructions that, when executed by the processor, cause the communication apparatus to provide execution comprising:
• sending, after performing radio link control layer function processing and adaptation function processing, uplink data to a donor base station by using at least one relay node, wherein
• the uplink data sent to the donor base station comprises at least one of:
• information about an identifier of the donor base station, information about an identifier of the terminal device, information about an identifier of the at least one relay node, information about an identifier of a quality of service flow QoS flow, information about an identifier of a protocol data unit session, information about an identifier of a radio bearer of the terminal device, and information about an identifier of a logical channel of the terminal device.