A method performed by a terminal in a wireless communication system, the method comprising: receiving, from a base station, configuration information on physical resource block, PRB, bundling via higher layer signaling, the configuration information including first information indicating whether a preceding resource block group, PRG, size is indicated via downlink control information, DCI, or the PRG size is configured via the higher layer signaling and second information including one or more PRG size values among a set of PRG size values which include 2, 4, and an allocated bandwidth for the terminal; in case that the first information indicates that the PRG size is indicated via the DCI: receiving, from the base station, the DCI including a PRG size indicator on a physical downlink control channel, PDCCH, wherein the PRG size indicator is set as a value corresponding to a PRG size value which is one of the one or more PRG size values, and identifying the PRG size based on the PRG size indicator and the configuration information; in case that the first information indicates that the PRG size is configured via the higher layer signaling, identifying the PRG size based on the configuration information; and estimating a channel state based on an assumption that a same preceding is applied to PRBs based on the identified PRG size. receiving, from a base station, configuration information on physical resource block, PRB, bundling via higher layer signaling, the configuration information including first information indicating whether a preceding resource block group, PRG, size is indicated via downlink control information, DCI, or the PRG size is configured via the higher layer signaling and second information including one or more PRG size values among a set of PRG size values which include 2, 4, and an allocated bandwidth for the terminal; in case that the first information indicates that the PRG size is indicated via the DCI: receiving, from the base station, the DCI including a PRG size indicator on a physical downlink control channel, PDCCH, wherein the PRG size indicator is set as a value corresponding to a PRG size value which is one of the one or more PRG size values, and identifying the PRG size based on the PRG size indicator and the configuration information; in case that the first information indicates that the PRG size is configured via the higher layer signaling, identifying the PRG size based on the configuration information; and estimating a channel state based on an assumption that a same preceding is applied to PRBs based on the identified PRG size. receiving, from the base station, the DCI including a PRG size indicator on a physical downlink control channel, PDCCH, wherein the PRG size indicator is set as a value corresponding to a PRG size value which is one of the one or more PRG size values, and identifying the PRG size based on the PRG size indicator and the configuration information; in case that the first information indicates that the PRG size is configured via the higher layer signaling, identifying the PRG size based on the configuration information; and estimating a channel state based on an assumption that a same preceding is applied to PRBs based on the identified PRG size. <EOS>