Method, apparatus for determining behavior of terminal device, terminal device and network device

A terminal device, comprising:

• a transceiver, configured to receive configuration information of a Secondary Cell Group (SCG) from a network device, wherein the configuration information of the SCG comprises first indication information, the first indication information indicating whether the SCG is in an active state or in a deactivated state;
• and
• a processor, configured to, in a case that the first indication information indicates that the SCG is in the deactivated state, determine at least one of the following:
• a behavior after the SCG is deactivated;
• or
• whether to perform a random access procedure to a Primary Secondary cell (PSCell) after the SCG is deactivated.

A network device, comprising:

• a transceiver, configured to send configuration information of a Secondary Cell Group (SCG) to a terminal device, wherein the configuration information of the SCG comprises first indication information, the first indication information indicating whether the SCG is in an active state or in a deactivated state;
• wherein the configuration information of the SCG is used for the terminal device to determine at least one of the following:
• a behavior after the SCG is deactivated;
• or
• whether to perform a random access procedure to a Primary Secondary cell (PSCell) after the SCG is deactivated.