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EP-4742802-A2 - METHOD FOR TRANSMITTING PHYSICAL DOWNLINK CONTROL CHANNEL AND DEVICE FOR SAME IN WIRELESS COMMUNICATION SYSTEM

EP4742802A2EP 4742802 A2EP4742802 A2EP 4742802A2EP-4742802-A2

Abstract

A method, which is performed by a terminal, for receiving a Physical Downlink Control Channel (PDCCH) in a wireless communication system comprises the steps of: receiving, from a base station, configuration information about a first control resource set (CORESET); receiving, from the base station, configuration information about a second CORESET; receiving, from the base station, a first PDCCH transmitted on the first CORESET; and receiving, from the base station, a second PDCCH transmitted on the second CORESET.

Inventors

  • SEOK, Geunyoung
  • CHOI, Kyungjun
  • NOH, MINSEOK
  • SON, JUHYUNG
  • KWAK, JINSAM

Assignees

  • Wilus Institute of Standards and Technology Inc.

Dates

Publication Date
20260513
Application Date
20210719

Claims (12)

  1. A wireless communication device configured to operate in a wireless communication system, the wireless communication device being a user equipment and comprising, a transceiver; and a processor configured to control the transceiver, wherein the processor is configured to: receive, from a base station, BS, information related to a first search space and a second search space, receive, from the BS, first downlink control information, DCI, included in a first physical downlink control channel, PDCCH, on the first search space, receive, from the BS, second DCI included in a second PDCCH on the second search space, wherein the first PDCCH and the second PDCCH are repeatedly received, wherein the first DCI and the second DCI are identical to each other, wherein the first search space and the second search space are of a same type, the type being a common search space or a UE specific search space, wherein the first search space and the second search space are configured in a same slot, transmit, to the BS, a physical uplink control channel, PUCCH, carrying hybrid automatic repeat request - acknowledgement, HARQ-ACK, information on a resource, wherein the resource is determined based on a PDCCH repetition corresponding to one of the first PDCCH and the second PDCCH, and wherein the PDCCH repetition is received on a search space having a smaller search space index among the first search space and the second search space.
  2. A wireless communication device configured to operate in a wireless communication system, the wireless communication device being a base station and comprising, a transceiver; and a processor configured to control the transceiver, wherein the processor is configured to: transmit, to a user equipment, UE, information related to a first search space and a second search space, transmit, to the UE, first downlink control information, DCI, included in a first physical downlink control channel, PDCCH, on the first search space, transmit, to the UE, second DCI included in a second PDCCH on the second search space, wherein the first PDCCH and the second PDCCH are repeatedly transmitted, wherein the first DCI and the second DCI are identical to each other, wherein the first search space and the second search space are of a same type, the type being a common search space or a UE specific search space, wherein the first search space and the second search space are configured in a same slot, receive, from the UE, a physical uplink control channel, PUCCH, carrying hybrid automatic repeat request - acknowledgement, HARQ-ACK, information on a resource, wherein the resource is determined based on a PDCCH repetition corresponding to one of the first PDCCH and the second PDCCH, and wherein the PDCCH repetition is received by the UE on a search space having a smaller search space index among the first search space and the second search space.
  3. The wireless communication device of claim 1 or 2, wherein the first PDCCH and the second PDCCH have a same aggregation level, AL.
  4. The wireless communication device of any one of claims 1 to 3, wherein the first DCI and the second DCI are each independently decoded.
  5. The wireless communication device of any one of claims 1 to 4, wherein the information includes an indicator, wherein the indicator is used to indicate that the first PDCCH and the second PDCCH are repeated PDCCHs.
  6. The wireless communication device of any one of claims 1 to 5, wherein a periodicity of the first search space and a periodicity of the second search space are identical to each other.
  7. A method performed by a user equipment configured to operate in a wireless communication system, comprising: receiving, from a base station, BS, information related to a first search space and a second search space; receiving, from the BS, first downlink control information, DCI, included in a first physical downlink control channel, PDCCH, on the first search space; receiving, from the BS, second DCI included in a second PDCCH on the second search space, wherein the first PDCCH and the second PDCCH are repeatedly received, wherein the first DCI and the second DCI are identical to each other, wherein the first search space and the second search space are of a same type, the type being a common search space or a UE specific search space, wherein the first search space and the second search space are configured in a same slot; transmitting, to the BS, a physical uplink control channel, PUCCH, carrying hybrid automatic repeat request - acknowledgement, HARQ-ACK, information on a resource, wherein the resource is determined based on a PDCCH repetition corresponding to one of the first PDCCH and the second PDCCH, and wherein the PDCCH repetition is received on a search space having a smaller search space index among the first search space and the second search space.
  8. A method performed by a base station configured to operate in a wireless communication system, the method comprising: transmitting, to a user equipment, UE, information related to a first search space and a second search space; transmitting, to the UE, first downlink control information, DCI, included in a first physical downlink control channel, PDCCH, on the first search space; transmitting, to the UE, second DCI included in a second PDCCH on the second search space, wherein the first PDCCH and the second PDCCH are repeatedly transmitted, wherein the first DCI and the second DCI are identical to each other, wherein the first search space and the second search space are of a same type, the type being a common search space or a UE specific search space, wherein the first search space and the second search space are configured in a same slot; receiving, from the UE, a physical uplink control channel, PUCCH, carrying hybrid automatic repeat request - acknowledgement, HARQ-ACK, information on a resource, wherein the resource is determined based on a PDCCH repetition corresponding to one of the first PDCCH and the second PDCCH, and wherein the PDCCH repetition is received by the UE on a search space having a smaller search space index among the first search space and the second search space.
  9. The method of claim 7 or 8, wherein the first PDCCH and the second PDCCH have a same aggregation level, AL.
  10. The method of any one of claims 7 to 9, wherein the first DCI and the second DCI are each independently decoded.
  11. The method of any one of claims 7 to 10, wherein the information including an indicator, wherein the indicator is used to indicate that the first PDCCH and the second PDCCH are repeated PDCCHs.
  12. The method of any one of claims 7 to 11, wherein a periodicity of the first search space and a periodicity of the second search space are identical to each other.

Description

Technical Field The present specification relates to a wireless communication system and, more specifically, to a method for transmitting a physical downlink control channel and an apparatus therefor. Background Art After commercialization of 4th generation (4G) communication system, in order to meet the increasing demand for wireless data traffic, efforts are being made to develop new 5th generation (5G) communication systems. The 5G communication system is called as a beyond 4G network communication system, a post LTE system, or a new radio (NR) system. In order to achieve a high data transfer rate, 5G communication systems include systems operated using the millimeter wave (mmWave) band of 6 GHz or more, and include a communication system operated using a frequency band of 6 GHz or less in terms of ensuring coverage so that implementations in base stations and terminals are under consideration. A 3rd generation partnership project (3GPP) NR system enhances spectral efficiency of a network and enables a communication provider to provide more data and voice services over a given bandwidth. Accordingly, the 3GPP NR system is designed to meet the demands for high-speed data and media transmission in addition to supports for large volumes of voice. The advantages of the NR system are to have a higher throughput and a lower latency in an identical platform, support for frequency division duplex (FDD) and time division duplex (TDD), and a low operation cost with an enhanced end-user environment and a simple architecture. For more efficient data processing, dynamic TDD of the NR system may use a method for varying the number of orthogonal frequency division multiplexing (OFDM) symbols that may be used in an uplink and downlink according to data traffic directions of cell users. For example, when the downlink traffic of the cell is larger than the uplink traffic, the base station may allocate a plurality of downlink OFDM symbols to a slot (or subframe). Information about the slot configuration should be transmitted to the terminals. In order to alleviate the path loss of radio waves and increase the transmission distance of radio waves in the mmWave band, in 5G communication systems, beamforming, massive multiple input/output (massive MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beam-forming, hybrid beamforming that combines analog beamforming and digital beamforming, and large scale antenna technologies are discussed. In addition, for network improvement of the system, in the 5G communication system, technology developments related to evolved small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense network, device to device communication (D2D), vehicle to everything communication (V2X), wireless backhaul, non-terrestrial network communication (NTN), moving network, cooperative communication, coordinated multi-points (CoMP), interference cancellation, and the like are being made. In addition, in the 5G system, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), which are advanced coding modulation (ACM) schemes, and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA), which are advanced connectivity technologies, are being developed. Meanwhile, in a human-centric connection network where humans generate and consume information, the Internet has evolved into the Internet of Things (IoT) network, which exchanges information among distributed components such as objects. Internet of Everything (IoE) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required, so that in recent years, technologies such as sensor network, machine to machine (M2M), and machine type communication (MTC) have been studied for connection between objects. In the IoT environment, an intelligent internet technology (IT) service that collects and analyzes data generated from connected objects to create new value in human life can be provided. Through the fusion and mixture of existing information technology (IT) and various industries, IoT can be applied to fields such as smart home, smart building, smart city, smart car or connected car, smart grid, healthcare, smart home appliance, and advanced medical service. Accordingly, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as a sensor network, a machine to machine (M2M), and a machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antennas. The application of the cloud RAN as the big data processing technology described above is an example of the fusion of 5G technology and