Method and apparatus for on demand synchronization signal block transmission and reception in mobile wireless communication system

A terminal in a wireless communication system, the terminal comprising:

• a transceiver configured to transmit and receive signals;
• and
• a controller configured to control the transceiver to:
• receive, from a base station, a radio resource control (RRC) message, wherein the RRC message comprises one or more sets of configuration parameters for secondary cells;
• receive, from the base station, a specific Medium Access Control (MAC) Control Element (CE) related to activation of an on-demand Synchronization Signal Block (SSB);
• and
• determine, based on the specific MAC CE, activation of the on-demand SSB in a specific secondary cell,
• wherein:
• the specific secondary cell is determined based on first information of the specific MAC CE, the first information being associated with a secondary cell index of the specific secondary cell;
• a specific number of on-demand SSBs are transmitted in the secondary cell, the specific number being determined based on second information of the specific MAC CE;
• and
• at least one of the on-demand SSBs is transmitted in the specific secondary cell at a specific System Frame Number (SFN), the specific SFN being determined based on the second information of the specific MAC CE.

A method performed by a base station, the method comprising:

• transmitting, by the base station to a terminal, a radio resource control (RRC) message, wherein the RRC message comprises one or more sets of configuration parameters for secondary cells;
• transmitting, by the base station to the terminal, a specific Medium Access Control (MAC) Control Element (CE) related to activation of an on-demand Synchronization Signal Block (SSB);
• and
• performing, by the base station based on the specific MAC CE, activation of the on-demand SSB in a specific secondary cell,
• wherein:
• the specific secondary cell is determined based on first information of the specific MAC CE, the first information being associated with a secondary cell index of the specific secondary cell;
• a specific number of bursts of on-demand SSBs are transmitted in the secondary cell, the specific number being determined based on second information of the specific MAC CE;
• and
• at least one of the on-demand SSBs is transmitted in the specific secondary cell at a specific System Frame Number (SFN), the specific SFN being determined based on the second information of the specific MAC CE.