TECHNICAL FIELD

The present invention relates to a technique for configuring a slot, and more particularly, to a method for transmitting and receiving configuration information indicating a structure of a slot constituting a subframe in a communication system.

BACKGROUND ART

With the development of information and communication technology, various wireless communication technologies are being developed. Typical wireless communication technologies include long term evolution (LTE), new radio (NR), or the like defined as the 3rd generation partnership project (3GPP) standard. The LTE may be one of 4th generation (4G) wireless communication technologies, and the NR may be one of 5th generation (5G) wireless communication technologies.

A 5G communication system (e.g., communication system supporting the NR) using a frequency band (e.g., frequency band above 6 GHz) higher than a frequency band (e.g., frequency band below 6 GHz) of a 4G communication system (e.g., communication system supporting the LTE) as well as the frequency band of the 4G communication system has been considered for processing of wireless data which has rapidly increased since commercialization of the 4G communication system. The 5G communication system can support Enhanced Mobile Broadband (eMBB), Ultra-Reliable and Low-Latency Communication (URLLC), and massive Machine Type Communication (mMTC).

In order to support the services described above (e.g., eMBB, URLLC, mMTC, etc.) in the 5G communication system, it is necessary to support a flexible frame and slot structure. Accordingly, a structure of a slot constituting a subframe may be different for each slot. In this case, there is a need for an efficient signaling method for informing the terminal of configuration information indicating the slot structure.

Meanwhile, the technology as the background of the invention is intended to enhance understanding of the background of the invention, and may include contents that are not known to the person of ordinary skill in the art.

DISCLOSURE

Technical Problem

The objective of the present invention to solve the above-described problem is to provide a method for transmitting and receiving configuration information indicating a structure of a slot constituting a subframe in a communication system.

Technical Solution

An operation method of a UE, according to a first embodiment of the present invention for achieving the above-described objective, may comprise receiving from a base station a first upper layer message including an SFI indicating a format of a slot; receiving from the base station a second upper layer message or a DCI indicating a use of a flexible symbol belonging to the slot configured by the SFI; and determining the flexible symbol belonging to the slot as a DL symbol, a UL symbol, or a flexible symbol based on the second upper layer message or the DCI.

Here, the first upper layer message may further include information indicating a slot configuration period for which the SFI is applied.

Here, the SFI may indicate a number of DL symbols and a number of UL symbols included in the slot.

Here, the first upper layer message may be a cell-specific RRC message and the second upper layer message may be a UE-specific RRC message.

Here, the DCI may include scheduling information indicating whether the flexible symbol belonging to the slot is used for downlink transmission or uplink transmission.

Here, the slot configured by the SFI may include DL symbol, UL symbol, and flexible symbol.

Here, the operation method may further comprise, when the flexible symbol belonging to the slot is determined as a DL symbol, receiving from the base station at least one of a DL channel and a DL signal in the flexible symbol.

Here, the operation method may further comprise, when the flexible symbol belonging to the slot is determined as a UL symbol, transmitting to the base station at least one of a UL channel and a UL signal in the flexible symbol.

Here, an operation for transmitting or receiving a channel or a signal may not be performed in the flexible symbol when the flexible symbol belonging to the slot is determined to be maintained based on the second upper layer message or the DCI.

An operation method of a base station, according to a second embodiment of the present invention for achieving the above-described objective, may comprise transmitting a first upper layer message including an SFI indicating a format of a slot; and transmitting a second upper layer message or a DCI indicating a use of a flexible symbol belonging to the slot configured by the SFI, wherein the flexible symbol belonging to the slot is determined as a DL symbol, a UL symbol, or a flexible symbol based on the second upper layer message or the DCI.

Here, the first upper layer message may further include information indicating a slot configuration period for which the SFI is applied.

Here, the SFI may indicate a number of DL symbols and a number of UL symbols included in the slot.

Here, the first upper layer message may be a cell-specific RRC message and the second upper layer message is a UE-specific RRC message.

Here, the DCI may include scheduling information indicating whether the flexible symbol belonging to the slot is used for downlink transmission or uplink transmission.

Here, the operation method may further comprise, when the flexible symbol belonging to the slot is determined as a DL symbol, transmitting to the UE at least one of a DL channel and a DL signal in the flexible symbol.

Here, the operation method may further comprise, when the flexible symbol belonging to the slot is determined as a UL symbol, receiving from the UE at least one of a UL channel and a UL signal in the flexible symbol.

An operation method of a UE, according to a third embodiment of the present invention for achieving the above-described objective, may comprise receiving from a base station an SFI indicating a format of a slot #i belonging to a bandwidth part #1 having a subcarrier spacing of m kHz; determining types of symbols included in the slot #i based on the SFI; and determining types of symbols included in slots #j to #(j+2u−1) belonging to a bandwidth part #2 having a subcarrier spacing of 2u×m kHz based on the SFI, wherein m is 15, 30, 60, 120 or 240, u is an integer equal to or greater than 1, each of i and j is an integer equal to or greater than 0, and a type of each of the symbols is a DL symbol, a flexible symbol, or a UL symbol.

Here, types of 2u consecutive symbols included in the slots #j to #(j+2u−1), which are aligned in time axis with one symbol included in the slot #i, may be determined to be identical to a type of the one symbol included in the slot #i.

Here, a type of a symbol #p belonging to each of the slots #j to #(j+2u−1) may be determined to be identical to a type of a symbol #p belonging to the slot #i, a number of symbols belonging to each of the slots #j to #(j+2u−1) may be equal to a number of symbols belonging to the slot #i, and p may be an integer equal to or greater than 0.

Here, the SFI may be received from the base station through a downlink control information (DCI), and the DCI may further include information indicating a slot configuration period for which the SFI is applied.

Advantageous Effects

According to the present invention, a slot structure in a communication system may be configured dynamically by a base station. A slot may be classified into a downlink (DL) symbol, a flexible symbol, and an uplink (UL) symbol, and the use (e.g., downlink transmission or uplink transmission) of the flexible symbol included in the slot may be configured dynamically by the base station.

Also, when a plurality of bandwidth parts are configured in the communication system and the base station transmits information indicating a slot structure for one bandwidth part among the plurality of bandwidth parts, a user equipment (UE) may determine a slot structure of the remaining bandwidth parts based on the information indicating the slot structure of the one bandwidth part. Therefore, the performance of the communication system can be improved.

