Method and apparatus for performing conditional reconfiguration in mobile wireless communication system

1 . A method by a terminal, the method comprising:

receiving, by the terminal from a base station, a Radio Resource Control (RRC) reconfiguration message, wherein the RRC reconfiguration message comprises one or more sets of conditional reconfiguration parameters, wherein each set of the one or more sets of conditional reconfiguration parameters comprises at least:

a parameter related to one or more events; and

an inner RRC reconfiguration message;

receiving, by the terminal from the base station, physical layer control information related to conditional reconfiguration; and

applying by the terminal the inner RRC reconfiguration message associated with a specific applicable cell based on:

whether the specific applicable cell is configured with a first parameter;

whether the physical layer control information related to conditional reconfiguration is received;

reference signal received power of the specific applicable cell; and

a specific bit of the physical layer control information; and

wherein each set of the one or more sets of conditional reconfiguration parameters is associated with an applicable cell.

2 . The method of claim 1 ,

wherein the first parameter is related to operation of the terminal in case that the physical layer control information is received.

3 . The method of claim 1 ,

wherein the applicable cell is associated with a set of conditional reconfiguration parameters in case that a cell identifier of the applicable cell is comprised in the inner RRC reconfiguration message of the set of conditional reconfiguration parameters.

4 . The method of claim 1 ,

wherein the terminal applies the inner RRC reconfiguration message associated with the specific applicable cell in case that:

the specific applicable cell is configured with the first parameter;

the physical layer control information related to conditional reconfiguration is received;

reference signal received power of the specific applicable cell is better than reference signal received power of a second specific cell; and

the specific bit of the physical layer control information is set to a first value.

5 . The method of claim 1 ,

wherein the terminal applies the inner RRC reconfiguration message associated with the specific applicable cell in case that:

all of one or more events determined from the parameter related to one or more events are fulfilled;

the physical layer control information related to conditional reconfiguration is received; and

the specific bit of the physical layer control information is set to a first value.

6 . The method of claim 1 ,

wherein the terminal determines a cell is the applicable cell of a set of conditional reconfiguration parameters in case that cell identifier of the cell matches the value indicated in a special cell configuration parameter set of the set of conditional reconfiguration parameters.

7 . The method of claim 6 ,

wherein the inner RRC reconfiguration message comprised in the set of conditional reconfiguration parameters comprises the special cell configuration parameter set, wherein the special cell configuration parameter set comprises one or more parameters for target cell configuration.

8 . The method of claim 1 , the method further comprising,

starting, by the terminal, conditional reconfiguration evaluation in case that:

the physical layer control information related to conditional reconfiguration is received; and

the specific bit of the physical layer control information is set to a first value.

9 . The method of claim 1 ,

wherein the terminal applies the inner RRC reconfiguration message associated with the specific applicable cell in case that one of a first execution condition and a second execution condition is fulfilled.

10 . The method of claim 9 ,

wherein the first execution condition and the second execution condition are associated with the inner RRC reconfiguration message.

11 . The method of claim 6 ,

wherein the terminal performs measurement for one or more applicable cells determined from the one or more sets of conditional reconfiguration parameters.

12 . The method of claim 11 ,

wherein, in case that a second parameter is not present in the set of conditional reconfiguration parameters, the terminal:

performs measurement, during a first time period, for an applicable cell associated with the set of conditional reconfiguration parameters; and

does not perform measurement, during a second time period, for the applicable cell associated with the set of conditional reconfiguration parameters.

13 . The method of claim 11 ,

wherein, in case that a second parameter is present in the set of conditional reconfiguration parameters, the terminal:

performs measurement, during a first time period, for an applicable cell associated with the set of conditional reconfiguration parameters; and

performs measurement, during a second time period, for the applicable cell associated with the set of conditional reconfiguration parameters.

14 . The method of claim 13 ,

wherein the first time period is a time period during which reference signal received power of a special cell after filtering is lower than a threshold, and

wherein the second time period is a time period during which reference signal received power of the special cell after filtering is higher than the threshold.

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

a transceiver configured to transmit and receive a signal, and

a controller configured to control the transceiver to:

receive from a base station a Radio Resource Control (RRC) reconfiguration message, wherein the RRC reconfiguration message comprises one or more sets of conditional reconfiguration parameters, wherein each set of the one or more sets of conditional reconfiguration parameters comprises at least:

a parameter related to one or more events; and

an inner RRC reconfiguration message;

receive from the base station physical layer control information related to conditional reconfiguration; and

apply the inner RRC reconfiguration message associated with a specific applicable cell based on:

whether the specific applicable cell is configured with a first parameter;

whether the physical layer control information related to conditional reconfiguration is received;

reference signal received power of the specific applicable cell; and

a specific bit of the physical layer control information; and

wherein each set of the one or more sets of conditional reconfiguration parameters is associated with an applicable cell.