Method and apparatus for transmitting data and communication system

An apparatus for transmitting data of vehicle communication (V2X) services, configured in a network device, the apparatus comprising:

• a memory that stores a plurality of instructions;
• processor circuitry that couples to the memory and that is configured to execute the instructions to:
• generate indication information used for configuring or indicating transmission modes for transmitting data of a terminal equipment, wherein the transmission modes comprise unicast, groupcast, or broadcast;
• and
• transmit the indication information to the terminal equipment from the network device that is a network device of an access network via system information or via dedicated radio resource control (RRC) signaling, and the indication information is used, by the terminal equipment, to configure the transmission mode for a sidelink Radio Bearer,
• wherein the terminal equipment generates at least one protocol data unit (PDU) in a way that transmission modes to which service data units (SDU) contained in a PDU correspond are identical in a media access control (MAC) layer and transmits the PDU to a physical layer of the terminal equipment, and notify, in separate information from the PDU, the transmission mode to which the PDU corresponds to the physical layer,
• wherein the terminal equipment sets the transmission modes according to received indication information indicating the transmission modes.

A communication system, comprising a network device and a terminal equipment;

• wherein the network device comprises a first apparatus for transmitting data of vehicle communication (V2X) services, configured in the network device, the first apparatus comprising:
• first processor circuitry configured to:
• generate indication information used for indicating transmission modes for transmitting data of a terminal equipment, wherein the transmission modes comprise unicast, groupcast, or broadcast;
• and
• transmit the indication information to the terminal equipment from the network device that is a network device of an access network via system information or via dedicated radio resource control (RRC) signaling, and the indication information is used, by the terminal equipment, to configure the transmission mode for a sidelink Radio Bearer;
• and
• the terminal equipment comprises a second apparatus for transmitting data of V2X services, configured in the terminal equipment, the second apparatus comprising:
• second processor circuitry configured to:
• configure a media access control (MAC) layer of the terminal equipment to generate at least one protocol data unit (PDU) in a way that transmission modes to which service data units (SDU) contained in a PDU correspond are identical;
• and
• configure the MAC layer to transmit the PDU to a physical layer of the terminal equipment, and notify, in separate information from the PDU, the transmission mode to which the PDU corresponds to the physical layer;
• and
• set the transmission mode according to received indication information indicating the transmission mode.