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EP-3833135-B1 - BASE STATION DEVICE, TERMINAL DEVICE, AND COMMUNICATION METHOD

EP3833135B1EP 3833135 B1EP3833135 B1EP 3833135B1EP-3833135-B1

Inventors

  • LIU, LIQING
  • YAMADA, SHOHEI
  • TAKAHASHI, HIROKI
  • HOSHINO, MASAYUKI
  • TSUBOI, HIDEKAZU

Dates

Publication Date
20260506
Application Date
20190726

Claims (12)

  1. A terminal apparatus (1A, 1B), comprising: a receiving portion (10) configured to: receive a setting of an initial downlink, DL, bandwidth part, BWP, via a radio resource control, RRC, message, and receive a downlink control information, DCI, format that schedules a physical downlink shared channel, PDSCH, in an active DL BWP; a control portion (14) configured to identify, based on a field in the DCI format, a resource block set to which the PDSCH is allocated and which is indicated by a start resource block and a number of consecutively allocated resource blocks; and the receiving portion (10) configured to receive the PDSCH in the active DL BWP based on the DCI format, wherein: the setting of the initial DL BWP comprises a first parameter of a control resource set, CORESET, #0 and a second parameter, a value of an identifier of the CORESET#0 is 0, the first parameter represents a size of the CORESET#0, the second parameter represents a size of the initial DL BWP, a serving cell is configured with the initial DL BWP and an additional DL BWP, one of the initial DL BWP and the additional DL BWP is activated as the active DL BWP, a value of the field in the DCI format is determined based on a size of a DL BWP, the start resource block, and the number of the consecutively allocated resource blocks, and a size of the DCI format in a user equipment, UE, -specific search space, USS, is determined based on the size of the CORESET#0, and when the DCI format is applied to the active DL BWP, the size of the DL BWP is the size of the CORESET#0.
  2. The terminal apparatus (1A, 1B) according to claim 1, wherein: the value of the field in the DCI format is determined based on a value of a coefficient, when a size of the active DL BWP is greater than the size of the CORESET#0, the value of the coefficient is determined based on the size of the active DL BWP and the size of the CORESET#0, and when the size of the active DL BWP is less than the size of the CORESET#0, the value of the coefficient is 1.
  3. The terminal apparatus (1A, 1B) according to claim 1, wherein: the initial DL BWP is activated as the active DL BWP, and a size of the active DL BWP is the size of the initial DL BWP.
  4. The terminal apparatus (1A, 1B) according to claim 1, wherein: the setting of the first parameter is not included in a setting of a BWP other than the initial DL BWP, a field of the first parameter is 4 bits, and the initial DL BWP comprises the CORESET#0 in a frequency domain.
  5. A base station apparatus (3), comprising: a transmitting portion (30) configured to: transmit a setting of an initial downlink, DL, bandwidth part, BWP, via a radio resource control, RRC, message, and transmit a downlink control information, DCI, format that schedules a physical downlink shared channel, PDSCH, in an active DL BWP; a control portion (34) configured to set, in a field in the DCI format, a value corresponding to a resource block set to which the PDSCH is allocated and which is indicated by a start resource block and a number of consecutively allocated resource blocks; and the transmitting portion (30) configured to transmit the PDSCH in the active DL BWP based on the DCI format, wherein: the setting of the initial DL BWP comprises setting a first parameter of a control resource set, CORESET, #0 and a second parameter, a value of an identifier of the CORESET#0 is 0, the first parameter represents a size of the CORESET#0, the second parameter represents a size of the initial DL BWP, a serving cell is set with the initial DL BWP and an additional DL BWP, one of the initial DL BWP and the additional DL BWP is activated as the active DL BWP, a value of the field in the DCI format is determined based on the size of the DL BWP, the start resource block, and the number of the consecutively allocated resource blocks, and a size of the DCI format in a user equipment, UE, -specific search space, USS, is determined based on the size of the CORESET#0, and when the DCI format is applied to the active DL BWP, the size of the DL BWP is the size of the CORESET#0.
  6. The base station apparatus (3) according to claim 5, wherein: the value of the field in the DCI format is determined based on a value of a coefficient, when a size of the active DL BWP is greater than the size of the CORESET#0, the value of the coefficient is determined based on the size of the active DL BWP and the size of the CORESET#0, and when the size of the active DL BWP is less than the size of the CORESET#0, the value of the coefficient is 1.
  7. The base station apparatus (3) according to claim 5, wherein: the initial DL BWP is activated as the active DL BWP, and a size of the active DL BWP is the size of the initial DL BWP.
  8. The base station apparatus (3) according to claim 5, wherein: the setting of the first parameter is not included in a setting of a BWP other than the initial DL BWP; a field of the first parameter is 4 bits; and the initial DL BWP comprises the CORESET#0 in a frequency domain.
  9. A communication method for a terminal apparatus (1A, 1B), the communication method comprising: receiving a setting of an initial downlink, DL, bandwidth part, BWP, via a radio resource control, RRC, message, receiving a downlink control information, DCI, format that schedules a physical downlink shared channel, PDSCH, in an active DL BWP; and identifying, based on a field in the DCI format, a resource block set to which the PDSCH is allocated and which is indicated by a start resource block and a number of consecutively allocated resource blocks; and receiving the PDSCH in the active DL BWP based on the DCI format, wherein: the setting of the initial DL BWP comprises setting a first parameter of a control resource set, CORESET, #0 and a second parameter, a value of an identifier of the CORESET#0 is 0, the first parameter represents a size of the CORESET#0, the second parameter represents a size of the initial DL BWP, a serving cell is set with the initial DL BWP and an additional DL BWP, one of the initial DL BWP and the additional DL BWP is activated as the active DL BWP, a value of the field in the DCI format is determined based on a size of a DL BWP, the start resource block, and the number of the consecutively allocated resource blocks, and a size of the DCI format in a user equipment, UE, -specific search space, USS, is determined based on the size of the CORESET#0, and when the DCI format is applied to the active DL BWP, the size of the DL BWP is the size of the CORESET#0.
  10. The communication method according to claim 9, wherein: the value of the field in the DCI format is determined based on a value of a coefficient, when a size of the active DL BWP is greater than the size of the CORESET#0, the value of the coefficient is determined based on the size of the active DL BWP and the size of the CORESET#0, and when the size of the active DL BWP is less than the size of the CORESET#0, the value of the coefficient is 1.
  11. The communication method according to claim 9, wherein: the initial DL BWP is activated as the active DL BWP, and a size of the active DL BWP is the size of the initial DL BWP.
  12. The communication method according to claim 9, wherein: setting the first parameter is not included in a setting of a BWP other than the initial DL BWP, a field of the first parameter is 4 bits, and the initial DL BWP comprises the CORESET#0 in a frequency domain.

Description

TECHNICAL FIELD The present invention relates to a terminal apparatus, a base station apparatus, and a communication method for a terminal apparatus. BACKGROUND ART At present, as a wireless access method and a wireless network technology oriented to a fifth-generation cellular system, in the Third Generation Partnership Project (3GPP), technical research and standard formulation have been conducted for the Long Term Evolution (LTE)-Advanced Pro (an extension standard of LTE, i.e., LTE-A Pro) and the New Radio technology (NR technology) (RP-161214, NTT DOCOMO, "Revision of SI: Study on New Radio Access Technology", June, 2016). In the fifth-generation cellular system, the following three scenarios are requested as assumptive scenarios of services: enhanced Mobile BroadBand (eMBB) for implementing high-speed/large-capacity transmission, Ultra-Reliable and Low Latency Communication (URLLC) for implementing low-latency/high-reliability communication, and massive Machine Type Communication (mMTC), such as the Internet of Things (IoT), in which a large number of machine type devices are connected. Nokia et al, "On the remaining issues for DCI format sizes and contents", 3GPP TSG RAN WG1 Meeting #93, Busan, Republic of Korea, 21 to 25 May 2018, 3GPP Draft R1-1806657, discusses the size alignment of different DCI formats and the interpretation of the frequency RA field, proposing inter alia that for format 1_0 in USS, in case the DCI size is determined using the initial BWP instead of the active BWP, one of the following options to be used for the interpretation of frequency RA filed: Derive the start position and length from RIV based on the initial BWP or a virtual BWP (the maximum bandwidth that can be supported by the bitwidth of the frequency RA field), and apply them to the active BWP, or Derive the start position and length from RIV based on the initial BWP, apply a scaling factor and then apply to the active BWP. MediaTek Inc., "Remaining Issues on DCI Contents and Formats", 3GPP TSG RAN WG1 Meeting #92bis, Sanya, China, 16 to 20 April, 2018, 3GPP Draft R1-1804045, discusses remaining issues on DCI formats and contents. Huawei et al, "Remaining issues on DCI contents and formats", 3GPP TSG RAN WG1 Meeting #92bis, Sanya, China, 16 to 20 April, 2018, 3GPP Draft R1-1803707, discusses remaining issues on DCI contents and formats, including the number of DCI sizes to be monitored, solutions to meet C-RNTI size and DCI size budget per slot, the interpretation of the frequency domain field in a DCI. Samsung, "DCI Contents and Formats", 3GPP TSG RAN WG1 Meeting #92bis, Sanya, China, 16 to 20 April, 2018, 3GPP Draft R1-1804372, discusses DCI contents and formats. SUMMARY OF INVENTION Problem to be solved by the invention An objective of a solution of the present invention is to provide a terminal apparatus, a base station apparatus, and a communication method for a terminal apparatus that can efficiently perform communication in a wireless communication system as described above. Technical solutions The above and other problems are solved by a terminal apparatus, a base station apparatus, and a communication method for a terminal apparatus as defined in the independent claims. Preferred embodiments are set forth in the dependent claims. Beneficial effect According to a solution of the present invention, a base station apparatus and a terminal apparatus can perform communication efficiently. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram showing the concept of a wireless communication system according to an implementation manner of the present invention.FIG. 2 is a diagram showing an example of an SS/PBCH block and an SS burst set according to an implementation manner of the present invention.FIG. 3 is a diagram showing an example of a schematic configuration of uplink and downlink slots according to an implementation manner of the present invention.FIG. 4 is a diagram showing relationships among subframes, slots, and minislots in a time domain according to an implementation manner of the present invention.FIG. 5 is a diagram showing an example of a slot or subframe according to an implementation manner of the present invention.FIG. 6 is a diagram showing an example of beamforming according to an implementation manner of the present invention.FIG. 7 is a diagram showing an example of BWP setting according to an implementation manner of the present invention.FIG. 8 is a diagram showing an example illustrating an uplink resource allocation type 1 for a BWP according to an implementation manner of the present embodiment.FIG. 9 is a diagram showing an example of calculating an RIV according to an implementation manner of the present invention.FIG. 10 is a schematic block diagram showing a configuration of a terminal apparatus 1 according to an implementation manner of the present invention.FIG. 11 is a schematic block diagram showing a configuration of a base station apparatus 3 according to an implementation manner