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EP-4738754-A2 - METHOD, APPARATUS AND SYSTEM FOR TRANSMITTING AND RECEIVING CONTROL CHANNEL OF WIRELESS COMMUNICATION SYSTEM

EP4738754A2EP 4738754 A2EP4738754 A2EP 4738754A2EP-4738754-A2

Abstract

The present invention relates to a wireless communication system. In particular, the present invention relates to a method including: receiving configuration information on a periodic signal through a higher layer signal, wherein a transmission/reception position of the periodic signal is configured to a first set of symbols within each slot which is set periodically; monitoring a PDCCH associated with a slot configuration of a first slot in order to receive slot configuration information for the first slot in which the transmission/reception position of the periodic signal is present; and performing a process for transmitting/receiving the periodic signal in the first slot, wherein when the first set of symbols within the first slot is designated as a flexible symbol by a higher layer, a transmission/reception of the periodic signal in the first slot is selectively performed according to a detection result of the PDCCH, and wherein the flexible symbol means a symbol whose purpose can be re-designated to DL, UL or flexible according to the slot configuration information of the PDCCH, and an apparatus therefor.

Inventors

  • CHOI, Kyungjun
  • NOH, MINSEOK
  • KWAK, JINSAM

Assignees

  • Wilus Institute of Standards and Technology Inc.

Dates

Publication Date
20260506
Application Date
20180326

Claims (16)

  1. A user equipment (100), UE, configured to operate in a 3 rd generation partnership project, 3GPP,-based wireless communication system, the UE comprising: a communication module (120); and a processor (110), wherein the processor (110) is configured to: receive a radio resource control, RRC, signal including a semi-static downlink/uplink, DL/UL, assignment related to a slot configuration for a slot, wherein the semi-static DL/UL assignment provides a number X of downlink symbols in the slot and a number Y of uplink symbols in the slot; determine the slot configuration for the slot as being configured in an order of zero or more downlink symbols, zero or more flexible symbols and zero or more uplink symbols based on the semi-static DL/UL assignment, wherein remaining symbols in the slot, excluding X downlink symbols and Y uplink symbols, are identified as flexible symbols; monitor a group common physical downlink control channel, GC-PDCCH, including a slot format indicator, SFI, associated with the slot, wherein the SFI indicates each symbol type of the flexible symbols in the slot as one of downlink, uplink or flexible; and when the UE is configured by a higher layer to receive a downlink signal in a set of flexible symbols of the slot, receive the downlink signal in the set of flexible symbols of the slot only if the set of flexible symbols of the slot is indicated as downlink by the SFI.
  2. The UE (100) of claim 1, wherein the UE does not receive the downlink signal in the set of flexible symbols of the slot, 1) when the GC-PDCCH is not detected for the slot by the UE, or 2) when the SFI indicates the set of flexible symbols of the slot as flexible or uplink, if the GC-PDCCH is detected for the slot by the UE.
  3. The UE (100) of claim 1 or 2, wherein when the UE is configured by a higher layer to transmit an uplink signal in the set of flexible symbols of the slot, the UE transmits the uplink signal in the set of flexible symbols of the slot only if the set of flexible symbols of the slot is indicated as uplink by the SFI.
  4. The UE (100) of claim 3, wherein the UE does not transmit the uplink signal in the set of flexible symbols of the slot, 1) when the GC-PDCCH is not detected for the slot by the UE, or 2) when the SFI indicates the set of flexible symbols of the slot as flexible or downlink, if the GC-PDCCH is detected for the slot by the UE.
  5. A method performed by a user equipment (100), UE, configured to operate in a 3 rd generation partnership project, 3GPP,-based wireless communication system, the method comprising: receiving a radio resource control, RRC, signal including a semi-static downlink/uplink, DL/UL, assignment related to a slot configuration for a slot, wherein the semi-static DL/UL assignment provides a number X of downlink symbols in the slot and a number Y of uplink symbols in the slot; determining the slot configuration for the slot as being configured in an order of zero or more downlink symbols, zero or more flexible symbols and zero or more uplink symbols based on the semi-static DL/UL assignment, wherein remaining symbols in the slot, excluding X downlink symbols and Y uplink symbols, are identified as flexible symbols; monitoring a group common physical downlink control channel, GC-PDCCH, including a slot format indicator, SFI, associated with the slot, wherein the SFI indicates each symbol type of the flexible symbols in the slot as one of downlink, uplink or flexible; and when the UE is configured by a higher layer to receive a downlink signal in a set of flexible symbols of the slot, receiving the downlink signal in the set of flexible symbols of the slot only if the set of flexible symbols of the slot is indicated as downlink by the SFI.
  6. The method of claim 5, wherein the UE does not receive the downlink signal in the set of flexible symbols of the slot, 1) when the GC-PDCCH is not detected for the slot by the UE, or 2) when the SFI indicates the set of flexible symbols of the slot as flexible or uplink, if the GC-PDCCH is detected for the slot by the UE.
  7. The method of claim 5 or 6, wherein when the UE is configured by a higher layer to transmit an uplink signal in the set of flexible symbols of the slot, the UE transmits the uplink signal in the set of flexible symbols of the slot only if the set of flexible symbols of the slot is indicated as uplink by the SFI.
  8. The method of claim 7, wherein the UE does not transmit the uplink signal in the set of flexible symbols of the slot, 1) when the GC-PDCCH is not detected for the slot by the UE, or 2) when the SFI indicates the set of flexible symbols of the slot as flexible or downlink, if the GC-PDCCH is detected for the slot by the UE.
  9. A base station (200), BS, configured to operate in a 3 rd generation partnership project, 3GPP,-based wireless communication system, the BS comprising: a communication module (220); and a processor (210), wherein the processor (210) is configured to: transmit a radio resource control, RRC, signal including a semi-static downlink/uplink, DL/UL, assignment related to a slot configuration for a slot, wherein the semi-static DL/UL assignment provides a number X of downlink symbols in the slot and a number Y of uplink symbols in the slot; determine the slot configuration for the slot as being configured in an order of zero or more downlink symbols, zero or more flexible symbols and zero or more uplink symbols based on the semi-static DL/UL assignment, wherein remaining symbols in the slot, excluding X downlink symbols and Y uplink symbols, are identified as flexible symbols; determine whether to transmit a group common physical downlink control channel, GC-PDCCH, including a slot format indicator, SFI, associated with the slot, wherein the SFI indicates each symbol type of the flexible symbols in the slot as one of downlink, uplink or flexible; and when the BS is configured by a higher layer to transmit a downlink signal in a set of flexible symbols of the slot, transmit the downlink signal in the set of flexible symbols of the slot only if the set of flexible symbols of the slot is indicated as downlink by the SFI.
  10. The BS (200) of claim 9, wherein the BS does not transmit the downlink signal in the set of flexible symbols of the slot, 1) when the GC-PDCCH is not transmitted for the slot, or 2) when the SFI indicates the set of flexible symbols of the slot as flexible or uplink, if the GC-PDCCH is transmitted for the slot.
  11. The BS (200) of claim 9 or 10, wherein when the BS is configured by a higher layer to receive an uplink signal in the set of flexible symbols of the slot, the BS receives the uplink signal in the set of flexible symbols of the slot only if the set of flexible symbols of the slot is indicated as uplink by the SFI.
  12. The BS (200) of claim 11, wherein the BS does not receive the uplink signal in the set of flexible symbols of the slot, 1) when the GC-PDCCH is not transmitted for the slot, or 2) when the SFI indicates the set of flexible symbols of the slot as flexible or downlink, if the GC-PDCCH is transmitted for the slot.
  13. A method performed by a base station (200), BS, configured to operate in a 3 rd generation partnership project, 3GPP,-based wireless communication system, the method comprising: transmitting a radio resource control, RRC, signal including a semi-static downlink/uplink, DL/UL, assignment related to a slot configuration for a slot, wherein the semi-static DL/UL assignment provides a number X of downlink symbols in the slot and a number Y of uplink symbols in the slot; determining the slot configuration for the slot as being configured in an order of zero or more downlink symbols, zero or more flexible symbols and zero or more uplink symbols based on the semi-static DL/UL assignment, wherein remaining symbols in the slot, excluding X downlink symbols and Y uplink symbols, are identified as flexible symbols; determining whether to transmit a group common physical downlink control channel, GC-PDCCH, including a slot format indicator, SFI, associated with the slot, wherein the SFI indicates each symbol type of the flexible symbols in the slot as one of downlink, uplink or flexible; and when the BS is configured by a higher layer to transmit a downlink signal in a set of flexible symbols of the slot, transmitting the downlink signal in the set of flexible symbols of the slot only if the set of flexible symbols of the slot is indicated as downlink by the SFI.
  14. The method of claim 13, wherein the BS does not transmit the downlink signal in the set of flexible symbols of the slot, 1) when the GC-PDCCH is not transmitted for the slot, or 2) when the SFI indicates the set of flexible symbols of the slot as flexible or uplink, if the GC-PDCCH is transmitted for the slot.
  15. The method of claim 13 or 14, wherein when the BS is configured by a higher layer to receive an uplink signal in the set of flexible symbols of the slot, the BS receives the uplink signal in the set of flexible symbols of the slot only if the set of flexible symbols of the slot is indicated as uplink by the SFI.
  16. The method of claim 15, wherein the BS does not receive the uplink signal in the set of flexible symbols of the slot, 1) when the GC-PDCCH is not transmitted for the slot, or 2) when the SFI indicates the set of flexible symbols of the slot as flexible or downlink, if the GC-PDCCH is transmitted for the slot.

Description

[Technical Field] The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving control channels in a wireless communication system supporting time division multiple access. [Background Art] The 3rd generation partnership project new radio (3GPP NR) system improves the spectral efficiency of the network, enabling operators to provide more data and voice services over a given bandwidth. As a result, the 3GPP NR system is designed to meet the demands for high-speed data and media transmissions in addition to supporting large volumes of voice. The advantages of the NR system are supports of high processing amount, low latency, frequency division duplex (FDD) and time division duplex (TDD) on the same platform, improved end user experience, and a simple architecture with low operating costs. For more efficient data processing, a Dynamic TDD of the NR system may use a method of varying the number of orthogonal frequency division multiplexing (OFDM) symbols that can be used for uplink/downlink according to data traffic directions of users of a cell. For example, the base station may allocate a plurality of downlink OFDM symbols to a slot (or subframe) when a downlink traffic of the cell is larger than an uplink traffic. The information on the slot configuration should be transmitted to the terminals. [Disclosure] [Technical Problem] An object of the present invention is to provide a method for informing a terminal of information on a slot configuration, a communication method according to the slot configuration, and an apparatus therefor. Technical objects desired to be achieved in the present invention are not limited to the aforementioned objects, and other technical objects not described above will be clearly understood by those skilled in the art from the following disclosure. [Technical Solution] A first aspect of the present invention provides a method for determining a reception of a downlink signal by a user equipment in a wireless communication system, the method including: receiving configuration information on a periodic signal through a higher layer signal, wherein a reception position of the periodic signal is configured to a first set of symbols within each slot which is set periodically; monitoring a physical downlink control channel (PDCCH) associated with a slot configuration of a first slot in order to receive slot configuration information for the first slot in which the reception position of the periodic signal is present; and performing a process for receiving the periodic signal in the first slot, wherein when the first set of symbols within the first slot is designated as a flexible symbol by a higher layer, a reception of the periodic signal in the first slot is selectively performed according to a detection result of the PDCCH, and wherein the flexible symbol means a symbol whose purpose can be re-designated to downlink (DL), uplink (UL) or flexible according to the slot configuration information of the PDCCH. A second aspect of the present invention provides a user equipment used for a wireless communication system, the user equipment including: a communication module; and a processor, wherein the processor receives configuration information on a periodic signal through a higher layer signal, wherein a reception position of the periodic signal is configured to a first set of symbols within each slot which is set periodically, monitors a physical downlink control channel (PDCCH) associated with a slot configuration of a first slot in order to receive slot configuration information for the first slot in which the reception position of the periodic signal is present, and performs a process for receiving the periodic signal in the first slot, wherein when the first set of symbols within the first slot is designated as a flexible symbol by a higher layer, a reception of the periodic signal in the first slot is selectively performed according to a detection result of the PDCCH, and wherein the flexible symbol means a symbol whose purpose can be re-designated to downlink (DL), uplink (UL) or flexible according to the slot configuration information of the PDCCH. In the first and second aspects, the periodic signal may include a channel status information reference signal (CSI-RS). In the first and second aspects, the PDCCH may include a group common (GC)-PDCCH having a slot configuration for the first slot, and when the first set of symbols within the first slot is designated as a flexible symbol by the higher layer and the GC-PDCCH is not detected, the reception of the periodic signal in the first slot may be skipped. In the first and second aspects, the PDCCH may include a group common (GC)-PDCCH having slot configuration information for the first slot, and when the first set of symbols within the first slot is designated as a flexible symbol by the higher layer and the slot configuration information detected f