CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a 371 of International Application No. PCT/KR2018/006768 filed on Jun. 15, 2018, which claims priority to Korean Patent Application No. 10-2017-0075896 filed on Jun. 15, 2017, the disclosures of which are herein incorporated by reference in their entirety.

1. FIELD

The disclosure relates generally to a wireless communication system and, more specifically, to an apparatus and method for transmitting a downlink control channel in a wireless communication system.

2. DESCRIPTION OF RELATED ART

To meet the demand for wireless data traffic having increased since deployment of 4thgeneration (4G) communication systems, efforts have been made to develop an improved 5thgeneration (5G) or pre-5G communication system. Therefore, the 5G or pre-5G communication system is also called a ‘Beyond 4G Network’ or a ‘Post Long Term Evolution (LTE) System’.

The 5G communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 60 GHz bands, so as to accomplish higher data rates. To decrease propagation loss of the radio waves and increase the transmission distance, the beamforming, massive multiple-input multiple-output (MIMO), Full Dimensional MIMO (FD-MIMO), array antenna, an analog beam forming, large scale antenna techniques are discussed in 5G communication systems.

In addition, in 5G communication systems, development for system network improvement is under way based on advanced small cells, cloud Radio Access Networks (RANs), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), reception-end interference cancellation and the like.

In the 5G system, Hybrid frequency shift keying (FSK) and quadrature amplitude modulation (FQAM) and sliding window superposition coding (SWSC) as an advanced coding modulation (ACM), and filter bank multi carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as an advanced access technology have been developed.

In the 5G system, the introduction of beamforming technology has been discussed in order to improve channel gain. Accordingly, beamforming may be performed on a signal transmitted through various channels such as a control channel and a data channel.

SUMMARY

On the basis of the aforementioned discussion, the disclosure provides an apparatus and method for transmitting a downlink control channel in a wireless communication system by using beamforming.

In addition, the disclosure provides an apparatus and method for performing beamforming in consideration of the characteristic of a channel in a wireless communication system.

In addition, the disclosure provides an apparatus and method for transmitting a downlink control channel by using a plurality of transmission beams in a wireless communication system.

In addition, the disclosure provides an apparatus and method for providing information of beams allocated to a control channel in a wireless communication system.

In addition, the disclosure provides an apparatus and method for transmitting a data channel corresponding to a downlink control channel transmitted by using a plurality of transmission beams in a wireless communication system.

In addition, the disclosure provides an apparatus and method for feeding back an acknowledgement (ACK)/negative ACK (HACK) relating to a data channel corresponding to a downlink control channel transmitted by using a plurality of transmission beams in a wireless communication system.

According to various embodiments of the disclosure, a method for operating a base station in a wireless communication system includes: transmitting information regarding a configuration of a control channel using a plurality of transmission beams; transmitting control information through the control channel by using the plurality of transmission beams; and transmitting data through a data channel allocated by the control information, by using at least one of the plurality of transmission beams.

According to various embodiments of the disclosure, a method for operating a terminal in a wireless communication system includes: receiving information regarding a configuration of a control channel using a plurality of transmission beams; receiving control information through the control channel by using at least one of a plurality of reception beams paired with the plurality of transmission beams; and receiving data through a data channel allocated by the control information, by using at least one of the plurality of reception beams.

According to various embodiments of the disclosure, an apparatus for a base station in a wireless communication system includes: at least one processor; and a transceiver coupled to the at least one processor. The transceiver is configured to: transmit information regarding a configuration of a control channel using a plurality of transmission beams; transmit control information through the control channel by using the plurality of transmission beams; and transmit data through a data channel allocated by the control information, by using at least one of the plurality of transmission beams.

According to various embodiments of the disclosure, an apparatus for a terminal in a wireless communication system includes: at least one processor; and a transceiver coupled to the at least one processor. The transceiver is configured to: receive information regarding a configuration of a control channel using a plurality of transmission beams; receive control information through the control channel by using at least one of a plurality of reception beams paired with the plurality of transmission beams; and receive data through a data channel allocated by the control information, by using at least one of the plurality of reception beams.

The information regarding the configuration of the control channel may include at least one of: information indicating whether the plurality of transmission beams are used; information regarding a transmission pattern of the control channel; information regarding beam allocation for each transmission instance of the control channel; information regarding at least one of a transmission beam for transmission of the control channel and a reception beam for reception of the control channel; information regarding resource allocation for the control channel; information regarding at least one of a transmission beam for transmission of the data channel and a reception beam for reception of the data channel; and information indicating whether pieces of control information included in control channels transmitted by using the plurality of transmission beams are equal.

According to an apparatus and method according to various embodiments of the disclosure, downlink control information is transmitted by using a plurality of beams, whereby a downlink control channel can be efficiently transmitted.

Effects which can be acquired by the disclosure are not limited to the above described effects, and other effects that have not been mentioned may be clearly understood by those skilled in the art from the following description.

