Method for acquiring system frame number by terminal, terminal, and mobile communication system

A method by a second base station in a wireless communication system, the method comprising:

• determining to add at least one secondary cell including a primary secondary cell (PSCell) having a physical uplink control channel (PUCCH) resource, of the second base station;
• and
• transmitting, on the PSCell to a terminal, master information block (MIB) or physical broadcast channel (PBCH), the MIB or the PBCH includes a system frame number (SFN) which is applied to communicate with the at least one secondary cell of the second base station,
• wherein a radio resource control (RRC) message which is transmitted from a first base station to the terminal for adding the at least one secondary cell to the terminal includes information for the at least one secondary cell except for the SFN.

A method by a first base station in a wireless communication system, the method comprising:

• determining to add at least one secondary cell of a second base station to a terminal;
• and
• transmitting, to the terminal, a radio resource control (RRC) message for adding the at least one secondary cell of the second base station, wherein the RRC message includes information for the at least one secondary cell except for a system frame number (SFN),
• wherein the SFN which is applied to the at least one secondary cell of the second base station is transmitted to the terminal on master information block (MIB) or physical broadcast channel (PBCH) of a primary secondary cell (PSCell) of the second base station, and
• wherein the PSCell is configured with a physical uplink control channel (PUCCH) resource.

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

• a transceiver;
• and
• a controller coupled with the transceiver and configured to control to:
• receive, from a first base station, a radio resource control (RRC) message for adding at least one secondary cell of a second base station,
• receive, on a primary secondary cell (PSCell) of the second base station, master information block (MIB) or physical broadcast channel (PBCH), identify a system frame number (SFN) based on the MIB or the PBCH, and
• apply the identified SFN to communicate with the at least one secondary cell of the second base station,
• wherein the RRC message includes information for the at least one secondary cell except for the SFN, and
• wherein the PSCell is configured with a physical uplink control channel (PUCCH) resource.

A second base station in a wireless communication system, the second base station comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to control to:
• determine to add at least one secondary cell including a primary secondary cell (PSCell) having a physical uplink control channel (PUCCH) resource, of the second base station, and
• transmit, on the PSCell to a terminal, master information block (MIB) or physical broadcast channel (PBCH), the MIB or the PBCH includes a system frame number (SFN) which is applied to communicate with the at least one secondary cell of the second base station,
• wherein a radio resource control (RRC) message which is transmitted from a first base station to the terminal for adding the at least one secondary cell to the terminal includes information for the at least one secondary cell except for the SFN.

A first base station in a wireless communication system, the base station comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to control to:
• determine to add at least one secondary cell of a second base station to a terminal, and
• transmit, to the terminal, a radio resource control (RRC) message for adding the at least one secondary cell of the second base station,
• wherein the RRC message includes information for the at least one secondary cell except for a system frame number (SFN),
• wherein the SFN which is applied to the at least one secondary cell of the second base station is transmitted to the terminal on master information block (MIB) or physical broadcast channel (PBCH) of a primary secondary cell (PSCell) of the second base station, and
• wherein the PSCell is configured with a physical uplink control channel (PUCCH) resource.