Method and apparatus for supporting multiple partial frequency bands in wireless communication system

1. A method, performed by a terminal, of performing communication through multiple bandwidth parts (BWPs) in a wireless communication system, the method comprising:

receiving a terminal capability information request from a base station;

generating, based on the request, terminal capability information comprising capability information related to multiple active BWP of the terminal;

transmitting the generated terminal capability information to the base station;

receiving multiple active BWP configuration information configured in response to the capability information related to multiple active BWP of the terminal from the base station;

performing communication with the base station through multiple BWPs activated based on the multiple active BWP configuration information,

starting a BWP inactivity timer corresponding to the activated multiple BWPs; and

in case that communication of data transmitted and received through each of the activated multiple BWPs succeeds, starting the BWP inactivity timer,

wherein, in case that the BWP inactivity timer expires, at least one of an operation of stopping using all activated BWPs except an initial BWP and performing a random access procedure through the initial BWP, an operation of performing transition to an idle mode, an operation of performing transition to an inactive mode, a connected discontinuous reception (DRX) (CDRX) operation, a radio link failure (RLF) declaration operation, and a beam failure recovery operation is performed.

2. The method of claim 1 , further comprising:

receiving measurement reporting configuration information;

measuring a channel state at each of multiple BWPs activated based on the measurement reporting configuration information; and

reporting the measured channel state of each of the multiple BWPs.

3. The method of claim 2 , further comprising:

receiving control information for controlling at least some BWPs of the activated BWPs of the terminal, based on the channel state; and

controlling the at least some BWPs of the activated BWPs of the terminal, based on at least one of information on an inactive BWP and information on an active BWP included in the received control information.

4. The method of claim 3 , wherein the information on the inactive BWP comprises a to-be-deactivated BWP list or a to-be-deactivated BWP identifier, and the information on the active BWP comprises a to-be-activated BWP list and a to-be-activated BWP identifier,

wherein the controlling comprises controlling activation of a bandwidth on a list basis, based on at least one of the to-be-activated BWP list and the to-be-deactivated BWP list, or controlling activation of each BWP by comparing identifier information of a currently activated BWP with at least one of the to-be-activated BWP identifier and the to-be-deactivated BWP identifier.

5. The method of claim 3 , wherein the controlling comprises deactivating an activated BWP and activating a deactivated BWP by comparing a BWP identifier included in the control information with each of the activated multiple BWPs.

6. The method of claim 1 , wherein the multiple active BWP configuration information is received through a radio resource control (RRC) message or a system information block (SIB),

wherein the receiving of the multiple active BWP configuration information comprises receiving the SIB by selecting a control resource set (CORESET) which the terminal is capable of most quickly attempting to receive from among one or more CORESETs, receiving the SIB by selecting a CORESET determined to have best communication performance, receiving the SIB through all CORESETs, or receiving the SIB transmitted in case that a listen before talk (LBT) procedure performed by the base station first succeeds.

7. The method of claim 1 , wherein the performing of the communication comprises transmitting and receiving data through a BWP which the terminal is capable of most quickly attempting to receive from among the activated multiple BWPs, performing communication by selecting a BWP having best communication performance, performing communication through all BWPs, or performing communication through a BWP with which a listen before talk (LBT) procedure performed by the base station or the terminal first succeeds.

8. A method, performed by a base station, of performing communication through multiple bandwidth parts (BWPs) in a wireless communication system, the method comprising:

transmitting a terminal capability information request to a terminal;

receiving terminal capability information comprising capability information related to multiple active BWP of the terminal in response to the request;

transmitting multiple active BWP configuration information for configuring activation of multiple BWPs of the terminal based on the capability information related to multiple active BWP of the terminal; and

performing communication with the terminal through multiple BWPs activated based on the multiple active BWP configuration information,

starting a BWP inactivity timer corresponding to the activated multiple BWPs; and

in case that communication of data transmitted and received through each of the activated multiple BWPs succeeds, starting the BWP inactivity timer,

wherein, in case that the BWP inactivity timer expires, at least one of an operation of stopping using all activated BWPs except an initial BWP and performing a random access procedure through the initial BWP, an operation of performing transition to an idle mode, an operation of performing transition to an inactive mode, a connected discontinuous reception (DRX) (CDRX) operation, a radio link failure (RLF) declaration operation, and a beam failure recovery operation is performed.

9. The method of claim 8 , further comprising:

transmitting measurement reporting configuration information; and

receiving channel state information of each of the activated multiple BWPs measured based on the measurement reporting configuration information.

10. The method of claim 9 , further comprising transmitting control information for controlling at least some BWPs of the activated multiple BWPs of the terminal, based on the channel state information,

wherein information on an inactive BWP included in the transmitted control information comprises a to-be-deactivated BWP list or a to-be-deactivated BWP identifier, and

information on an active BWP included in the transmitted control information comprises a to-be-activated BWP list or a to-be-activated BWP identifier.

11. The method of claim 10 , wherein the control information is transmitted through a downlink control information (DCI) or radio resource control (RRC) message,

wherein the control information comprises information for controlling at least one BWP to be always active,

wherein the at least one BWP controlled to be always active is an initial BWP.

12. A terminal for performing communication through multiple bandwidth parts (BWPs), the terminal comprising:

a transceiver; and

at least one controller coupled to the transceiver, and configured to receive a terminal capability information request from a base station, generate, based on the request, terminal capability information comprising capability information related to multiple active BWP of the terminal, transmit the generated terminal capability information to the base station, receive multiple active BWP configuration information configured based on the capability information related to multiple active BWP of the terminal from the base station, and perform communication with the base station through multiple BWPs activated based on the multiple active BWP configuration information, start a BWP inactivity timer corresponding to the activated multiple BWPs, in case that communication of data transmitted and received through each of the activated multiple BWPs succeeds, starting the BWP inactivity timer, wherein, in case that the BWP inactivity timer expires, at least one of an operation of stopping using all activated BWPs except an initial BWP and performing a random access procedure through the initial BWP, an operation of performing transition to an idle mode, an operation of performing transition to an inactive mode, a connected discontinuous reception (DRX) (CDRX) operation, a radio link failure (RLF) declaration operation, and a beam failure recovery operation is performed.

13. The terminal of claim 12 , wherein the at least one controller is further configured to receive measurement reporting configuration information, measure a channel state at each of multiple BWPs activated based on the measurement reporting configuration information, and report the measured channel state of each of the multiple BWPs.

14. A base station for performing communication through multiple bandwidth parts (BWPs), the base station comprising:

a transceiver; and

at least one controller coupled to the transceiver, and configured to transmit a terminal capability information request to a terminal, receive, in response to the request, terminal capability information comprising capability information related to multiple active BWP of the terminal, transmit multiple active BWP configuration information for configuring activation of multiple BWPs of the terminal based on the capability information related to multiple active BWP of the terminal, and perform communication with the terminal through multiple BWPs activated based on the multiple active BWP configuration information, start a BWP inactivity timer corresponding to the activated multiple BWPs, in case that communication of data transmitted and received through each of the activated multiple BWPs succeeds, starting the BWP inactivity timer, wherein, in case that the BWP inactivity timer expires, at least one of an operation of stopping using all activated BWPs except an initial BWP and performing a random access procedure through the initial BWP, an operation of performing transition to an idle mode, an operation of performing transition to an inactive mode, a connected discontinuous reception (DRX) (CDRX) operation, a radio link failure (RLF) declaration operation, and a beam failure recovery operation is performed.