CN-114982339-B - Terminal and communication method

Abstract

The terminal includes a receiving unit that receives scheduling information for one or more second component carriers among a plurality of component carriers constituting carrier aggregation via a first component carrier, and a control unit that activates any BWP among a plurality of BWPs set for the one or more second component carriers based on identification information of a Bandwidth part (BWP) included in the scheduling information.

Inventors

• HARADA HIROYASU
• NAGATA AKIRA
• WANG LIHUI

Assignees

• 株式会社NTT都科摩

Dates

Publication Date

20260505

Application Date

20200110

Claims (4)

1. 1.A terminal, the terminal having: a receiving unit for receiving 1 st downlink control information 1 st DCI which is single for scheduling in a plurality of cells, and A control unit configured to set BWP to be activated in the plurality of cells based on a BWP indicator field which is a single bandwidth part indicator field included in the 1 st DCI, The BWP number is set by a higher layer, The control unit determines the bit size of the single BWP indicator field to be the maximum value of the BWP numbers set for the respective cells, The receiving part also receives the 2 nd DCI of scheduling one cell, The bit size of the BWP indicator field contained in the 2 DCI th bit and the bit size of the BWP indicator field contained in the 1 st DCI bit are each 0 bit, 1 bit, or 2 bits.
2. 2. The terminal of claim 1, wherein, The terminal further has a transmission section that transmits PUSCH in the plurality of cells using the activated BWP.
3. 3. A communication method of a terminal, comprising the steps of: a receiving step of receiving 1 st downlink control information 1 st DCI which is a single downlink control information for scheduling in a plurality of cells, and A control step of setting BWP to be activated in the plurality of cells based on a single bandwidth part indicator field, i.e., BWP indicator field, included in the 1 st DCI, In the control step, the BWP number is set by a higher layer, In the controlling step, the bit size of the single BWP indicator field is determined to be the maximum value of the BWP number set for each of the plurality of cells, In the receiving step, 2 nd DCI of scheduling a cell is also received, The bit size of the BWP indicator field contained in the 2 DCI th bit and the bit size of the BWP indicator field contained in the 1 st DCI bit are each 0 bit, 1 bit, or 2 bits.
4. 4. A base station, the base station having: a control unit that uses a single bandwidth part indicator field, i.e., BWP indicator field, in 1 st downlink control information, i.e., 1 st DCI, for scheduling in a plurality of cells in which BWP to be activated is set, A transmission unit that transmits the single 1 st DCI for scheduling in a plurality of cells, The control section sets the BWP number by a higher layer, The control section sets the bit size of the single BWP indicator field to a maximum value among BWP numbers set for each of the plurality of cells, The transmitting part also transmits the 2 nd DCI of scheduling one cell, The bit size of the BWP indicator field contained in the 2 DCI th bit and the bit size of the BWP indicator field contained in the 1 st DCI bit are each 0 bit, 1 bit, or 2 bits.

Description

Terminal and communication method Technical Field The present invention relates to a terminal and a communication method in a wireless communication system. Background NR (New Radio: new air interface) dynamic Spectrum sharing (Dynamic spectrum sharing: DSS) refers to the manner in which LTE (Long Term Evolution: long term evolution) and NR are used in the same carrier. In a system of LTE, CRS (CELL SPECIFIC REFERENCE SIGNAL: cell-specific reference signal), PDCCH (Physical Downlink Control Channel: physical downlink control channel), etc. are transmitted for LTE users. Therefore, in DSS, PDCCH and data of NR are transmitted while avoiding time resources for transmitting signals to LTE users. In release 17 of 3GPP, the implementation of DSS extension (enhancement) was studied. As specific details of the extension of DSS, for example, cross-carrier scheduling (cross-carrier scheduling) of a Physical downlink shared channel (Physical Downlink SHARED CHANNEL: PDSCH) or a Physical Uplink shared channel (Physical Uplink SHARED CHANNEL: PUSCH) of a PCell (or primary secondary Cell: primary and secondary cells (PSCell)) by using a Physical downlink control channel (Physical Downlink Control Channel: PDCCH) of a secondary cell (SCell) of CA has been studied. Further, it has been studied to schedule PDSCH of a plurality of cells using single downlink control information (Downlink Control Information: DCI) for PDCCH of P (S) Cell/SCell. Prior art literature Non-patent literature Non-patent document 1:3GPP TSG RAN Meeting#86,RP-193260,Sitges,Spain,December 9-12,2019 Non-patent document 2:3GPP TS38.213 V15.7.0 (2019-09) Disclosure of Invention Problems to be solved by the invention Minimizing the size of a single DCI used in scheduling for multiple cells has been studied. On the other hand, by including the BWP indication field (BWP indication field) in the DCI, an activated BWP can be designated to the terminal. In the case of scheduling for a plurality of cells, a method of efficiently designating an activated BWP to a terminal is required. Means for solving the problems According to one aspect of the present invention, there is provided a terminal including a receiving unit that receives scheduling information for one or more second component carriers among a plurality of component carriers constituting carrier aggregation via a first component carrier among the plurality of component carriers, and a control unit that activates any BWP among the plurality of BWP set for the one or more second component carriers based on identification information of a Bandwidth part (BWP) included in the scheduling information. Effects of the invention According to an embodiment, a method of efficiently designating an activated BWP to a terminal in case of scheduling for a plurality of cells is provided. Drawings Fig. 1 is a block diagram of a communication system in the present embodiment. Fig. 2 is a diagram showing an example of scheduling for a plurality of cells. Fig. 3 is a diagram showing an example of association between bit values of BWP indicator field and combinations of BWP activated in each CC. Fig. 4 is a diagram showing an example of joint coding of CIFs and BWP indication field. Fig. 5 is a diagram showing an example of a functional configuration of a terminal. Fig. 6 is a diagram showing an example of a functional configuration of a base station. Fig. 7 is a diagram showing an example of a hardware configuration of a terminal and a base station. Detailed Description Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are examples, and the embodiments to which the present invention is applied are not limited to the following embodiments. The case where the radio communication system in the following embodiment basically depends on NR is assumed, but this is only an example, and the radio communication system in the present embodiment may partially or entirely depend on a radio communication system other than NR (e.g., LTE). (System overall Structure) Fig. 1 shows a configuration diagram of a wireless communication system according to the present embodiment. As shown in fig. 1, the radio communication system according to the present embodiment includes a terminal 10 and a base station 20. In fig. 1, 1 terminal 10 and 1 base station 20 are shown, respectively, but this is only an example, and may have a plurality of terminals, respectively. The terminal 10 is a communication device having a wireless communication function, such as a smart phone, a mobile phone, a tablet computer, a wearable terminal, and a Machine-to-Machine (M2M) communication module. The terminal 10 receives a control signal or data from the base station 20 through DL and transmits the control signal or data to the base station 20 through UL, thereby utilizing various communication services provided by the wireless communication system. For example, the channel transmitte