Terminal and monitoring method

Abstract

A terminal comprising: a reception unit for receiving, from a base station, an offset that indicates the misalignment of a frame boundary or a slot boundary between a first cell and a second cell; and a control unit for monitoring a downlink control channel within a range of limitations on a combination of corresponding first cell slots and second cell slots, the range being designated by the offset.

Description

[Technical Field]

[0001] The present invention relates to a terminal, a base station, and a monitoring method in a wireless communication system. [Background technology]

[0002] For NR (New Radio) (also known as "5G"), the successor system to LTE (Long Term Evolution), technologies are being considered that meet the requirements of a large-capacity system, high data transmission speeds, low latency, simultaneous connection of many terminals, low cost, and power saving. NR is also expected to use high frequency bands such as 24.25 to 52.6 GHz and 52.6 to 71 GHz.

[0003] Furthermore, in NR, in carrier aggregation (CA), scheduling of the PDSCH or PUSCH of the P(S)Cell on the PDCCH of the SCell is under consideration. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 38.213 V16.7.0(2021-09) [Non-patent document 2] 3GPP TS 38.331 V16.6.0(2021-09) Summary of the Invention [Problem to be solved by the invention]

[0005] When scheduling the PDSCH or PUSCH of the P(S)Cell using the PDCCH of the SCell, the terminal needs to consider both the scheduling in the P(S)Cell and the scheduling in the SCell, which may increase the load of PDCCH monitoring. In addition, there may be cases where the frame boundary or slot boundary differs between CCs (component carriers), and it is also necessary to deal with such cases.

[0006] In conventional technology, the operation of cross-carrier scheduling as described above is not specified in cases where the frame boundaries or slot boundaries between CCs are different, so there is a possibility that the terminal will not be able to properly perform PDCCH monitoring related to cross-carrier scheduling.

[0007] The present invention has been made in consideration of the above points, and aims to provide a technology that enables a terminal to appropriately perform PDCCH monitoring related to cross-carrier scheduling even in cases where the frame boundaries or slot boundaries differ between CCs. [Means for solving the problem]

[0008] According to the disclosed technology, a control unit monitors a downlink control channel within a limited range of a portion where time positions of a first cell and a second cell overlap each other, where there is a shift in a frame boundary or a slot boundary; a receiving unit that receives control information via the downlink control channel; A terminal comprising: [Effects of the Invention]

[0009] According to the disclosed technology, a technology is provided that enables a terminal to appropriately perform PDCCH monitoring related to cross-carrier scheduling even when frame boundaries or slot boundaries differ between CCs. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. [Figure 2] 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. [Figure 3] FIG. 10 is a diagram illustrating an example of cross-carrier scheduling. [Figure 4] FIG. 10 is a diagram illustrating an example in which frame boundaries differ between cells. [Figure 5] FIG. 10 is a diagram illustrating an example in which frame boundaries differ between cells. [Figure 6] FIG. 1 is a diagram illustrating an example of a basic operation of the system. [Figure 7] FIG. 1 is a diagram for explaining a first embodiment. [Figure 8] FIG. 1 is a diagram for explaining a first embodiment. [Figure 9] FIG. 1 is a diagram for explaining a first embodiment. [Figure 10] FIG. 1 is a diagram for explaining a first embodiment. [Figure 11] FIG. 1 is a diagram for explaining a first embodiment. [Figure 12] FIG. 1 is a diagram for explaining a first embodiment. [Figure 13] FIG. 1 is a diagram for explaining a first embodiment. [Figure 14] FIG. 10 is a diagram for explaining a second embodiment. [Figure 15] FIG. 10 is a diagram for explaining a second embodiment. [Figure 16] FIG. 10 is a diagram for explaining a second embodiment. [Figure 17] FIG. 10 is a diagram for explaining an example common to the first and second embodiments. [Figure 18] 2 is a diagram illustrating an example of a functional configuration of a base station 10 according to an embodiment of the present invention. [Figure 19] FIG. 2 is a diagram illustrating an example of a functional configuration of a terminal 20 according to the embodiment of the present invention. [Figure 20] 2 is a diagram illustrating an example of a hardware configuration of a base station 10 or a terminal 20 according to an embodiment of the present invention. [Figure 21] FIG. 1 is a diagram illustrating an example of the configuration of a vehicle. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0012] Existing technology is used as appropriate for the operation of the wireless communication system according to the embodiment of the present invention. The existing technology is, for example, the existing NR (e.g., Non-Patent Documents 1 and 2). The wireless communication system (base station 10 and terminal 20) according to the present embodiment can basically perform operations in accordance with existing regulations. However, in order to solve the problem, the base station 10 and terminal 20 also perform operations that are not in the existing regulations. In the explanation of the examples described below, operations that are not in the existing regulations are mainly explained. Note that all numerical values ​​described below are examples.

[0013] Furthermore, in the embodiments of the present invention, the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or other methods (for example, Flexible Duplex, etc.).

[0014] Furthermore, in the embodiments of the present invention, "configuring" radio parameters and the like may mean that predetermined values ​​are pre-configured, or that radio parameters notified from the base station 10 or the terminal 20 are set. Note that the notation "A / B" used in the present embodiments means "A or B, or A and B."

[0015] (System Configuration)

[0016] Fig. 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. As shown in Fig. 1, the wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20. Although Fig. 1 shows one base station 10 and one terminal 20, this is an example, and there may be a plurality of each.

[0017] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of a wireless signal are defined in the time domain and the frequency domain.

[0018] OFDM is used as the radio access scheme. In the frequency domain, subcarrier spacing (SCS) of at least 15 kHz, 30 kHz, 120 kHz, and 240 kHz is supported. In this embodiment, larger SCSs are supported. Regardless of the SCS, a resource block is formed by a predetermined number (e.g., 12) of consecutive subcarriers.

[0019] For example, when performing initial access to a cell, terminal 20 detects an SSB (SS / PBCH block) and identifies the SCS in the PDCCH, PDSCH, PUCCH, etc. based on the PBCH included in the SSB.

[0020] In the time domain, a slot is made up of multiple OFDM symbols (for example, 14 symbols regardless of the subcarrier spacing). Hereinafter, an OFDM symbol is called a "symbol." A slot is a scheduling unit. Subframes of 1 ms duration are defined, and a frame consisting of 10 subframes is defined. The number of symbols per slot is not limited to 14. Frames with a definition different from the one defined above may also be used.

[0021] As shown in Fig. 1, a base station 10 transmits control information or data to a terminal 20 in a DL (Downlink) and receives control information or data from the terminal 20 in an UL (Uplink). Both the base station 10 and the terminal 20 are capable of transmitting and receiving signals by performing beamforming. Furthermore, both the base station 10 and the terminal 20 are capable of applying MIMO (Multiple Input Multiple Output) communication to DL or UL. Furthermore, both the base station 10 and the terminal 20 may communicate via a SCell (Secondary Cell) and a PCell (Primary Cell) using CA (Carrier Aggregation).

[0022] The terminal 20 is a communication device equipped with a wireless communication function, such as a smartphone, a mobile phone, a tablet, a wearable terminal, an M2M (Machine-to-Machine) communication module, etc. As shown in Fig. 1, the terminal 20 receives control information or data from the base station 10 via DL and transmits control information or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system.

[0023] Fig. 2 shows an example of the configuration of a wireless communication system when NR-DC (NR-Dual connectivity) is implemented. As shown in Fig. 2, a base station 10A serving as an MN (Master Node) and a base station 10B serving as an SN (Secondary Node) are provided. The base station 10A and the base station 10B are each connected to a core network. The terminal 20 communicates with both the base station 10A and the base station 10B.

[0024] A cell group provided by the base station 10A, which is an MN, is called an MCG (Master Cell Group), and a cell group provided by the base station 10B, which is an SN, is called an SCG (Secondary Cell Group). A PCell in an MCG (Master Cell Group) may be called a PSCell. The operation in this embodiment may be performed in either the configuration of FIG. 1 or FIG. 2. Furthermore, the DC may be an NR-NR DC, an NR-LTE DC, or a DC other than these.

[0025] Furthermore, in DC, when CCs are multiplexed among multiple base stations for transmission and reception, this may also be called “carrier aggregation.” Furthermore, in this application, CCs and cells may be treated as synonyms.

[0026] In the wireless communication system according to the present embodiment, when an unlicensed band is used, LBT (Listen Before Talk) is executed. The base station 10 or the terminal 20 transmits when the LBT result is idle, and does not transmit when the LBT result is busy.

[0027] (About cross-carrier scheduling) In the wireless communication system of this embodiment, it is assumed that cross-carrier scheduling is performed, so first, an example of cross-carrier scheduling will be described with reference to FIG.

[0028] In the example shown in Fig. 3, CC#x (P(S)Cell), CC#y (SCell), and CC#z (SCell) are shown. The left side of Fig. 3 is an example in which scheduling by PDCCH is performed in each of CC#x and CC#y, rather than cross-carrier scheduling. Note that PDCCH is an example of a downlink control channel, and DCI transmitted by PDCCH is an example of control information.

[0029] Examples of cross-carrier scheduling are shown in the center and right side of Figure 3. Specifically, the example in the center shows scheduling from CC#x (P(S)Cell) to CC#y (SCell) and scheduling from CC#y (SCell) to CC#z (SCell).

[0030] In the example on the right side of Fig. 3, scheduling is performed from CC#y (SCell) to CC#x (P(S)Cell). In this example, terminal 20 receives PDCCH (DCI) on CC#y (SCell) and performs data reception or data transmission on CC#x (P(S)Cell) according to the information of the DCI.

[0031] In this embodiment, an example is described assuming cross-carrier scheduling from an SCell to a P(S)Cell, as in the example on the right side of Fig. 3. However, the technology according to the present invention is not limited to cross-carrier scheduling from an SCell to a P(S)Cell, and can also be applied to cross-carrier scheduling from a P(S)Cell to an SCell and cross-carrier scheduling from one SCell to another SCell.

[0032] (About the assignment) When scheduling the PDSCH or PUSCH of the P(S)Cell on the PDCCH of the SCell, the terminal needs to consider both the scheduling on the P(S)Cell and the scheduling on the SCell, which may increase the load of PDCCH monitoring.

[0033] Furthermore, in the wireless communication system of this embodiment, it is also possible to perform CA between CCs with different frame boundaries, and in that case, the difference in frame boundaries between CCs can be notified from base station 10 to terminal 20 as a slot offset (ca-SlotOffset) (Non-Patent Document 2). By notifying terminal 20 of this difference, terminal 20 can grasp the amount of timing deviation between CCs.

[0034] An example in which the frame boundary differs between the PCell and the SCell is shown in Fig. 4. Fig. 5 shows slot offsets in the case of Fig. 4.

[0035] It is also possible to perform CA between CCs with different slot boundaries, and in this case, the base station 10 can notify the terminal 20 of the difference in the slot boundaries between the CCs.

[0036] In the prior art, the operation of cross-carrier scheduling from SCell to PCell / PSCell in cases where the frame boundary / slot boundary differs between CCs is not specified, so there is a possibility that terminal 20 may not be able to properly perform PDCCH monitoring related to cross-carrier scheduling.

[0037] Examples of operations that solve the above problems will be described below as Example 1 and Example 2.

[0038] (Basic operation example) An example of a basic operation common to the first and second embodiments will be described with reference to Fig. 6. In S101, the terminal 20 transmits capability information (UE capability) to the base station 10. This capability information may include, for example, information on whether or not the function described in the first or second embodiment is supported.

[0039] In S102, the base station 10 transmits configuration information to the terminal 20. This configuration information is, for example, information for configuring cross-carrier scheduling from an SCell to a PCell / PSCell between CCs with different frame boundaries / slot boundaries. Furthermore, this configuration information or other configuration information may be used to notify, for each CC, an offset indicating the shift in the frame boundary between CCs, an offset indicating the shift in the slot boundary between CCs, or the like.

[0040] The configuration information may also include restriction information, as will be described later, i.e., the number of PDCCH blind detection (hereinafter referred to as BD) candidates (maximum number of BD candidates) / CCE limit number (maximum number of CCEs). Note that CCE is an abbreviation for channel control element, and PDCCH (DCI) is transmitted by one or more CCEs. A CCE may also be called a unit resource of PDCCH. Furthermore, the restriction information may be defined in specifications and not set by base station 10. Furthermore, the restriction information is not limited to the number of BD candidates and the number of CCE limits.

[0041] In S103, terminal 20 monitors the PDCCH in the SCell and PCell / PSCell within the scope of the restriction information.

[0042] As a result of the monitoring in S103, if a PDCCH (DCI) addressed to the terminal 20 is received, the terminal 20 performs data transmission / data reception in accordance with the DCI in S104.

[0043] In the following, a first embodiment will be described for a case between CCs with different frame boundaries, and a second embodiment will be described for a case between CCs with different slot boundaries. Note that a "frame" and a "slot" are both examples of a unit interval in the time domain. The technology described below can also be applied to unit intervals in the time domain other than a "frame" and a "slot."

[0044] Example 1 Hereinafter, a description will be given of Example 1. In Example 1, when cross-carrier scheduling from an SCell to a Pcell / PSCell between CCs with different frame boundaries is configured in terminal 20, the number of BD candidates / CCE limits of PDCCH that terminal 20 can monitor in a PCell / PSCell slot / SCell slot is specified / set.

[0045] For example, the number of BD candidates / CCE limits of PDCCH that terminal 20 can monitor in a PCell / PSCell slot / SCell slot may be defined in the specifications, and terminal 20 and base station 10 may operate in accordance with the definition.

[0046] The number of BD candidates / CCE limit numbers for the PDCCH described above may be specified for each SCS (or numerology μ) used by terminal 20. Furthermore, the "number of BD candidates / CCE limit numbers" may be only the number of BD candidates, only the number of CCE limits, or both the number of BD candidates and the number of CCE limits.

[0047] In addition, the number of PDCCH BD candidates / CCE limit numbers that terminal 20 can monitor in the PCell / PSCell slot / SCell slot may be notified to terminal 20 by RRC, MAC CE, or DCI from base station 10, and terminal 20 may operate in accordance with the notification.

[0048] In Example 1, options 1 to 3 will be explained. The outline of each is as follows.

[0049] Option 1: The number of PDCCH BD candidates / CCE limit that terminal 20 can monitor is specified / set for the combination of the corresponding PCell / PSCell slot and SCell slot specified by the slot offset.

[0050] Option 2: The number of PDCCH BD candidates / CCE limits that terminal 20 can monitor is specified / set for combinations of PCell / PSCell slots and SCell slots that overlap in time position.

[0051] Option 3: The number of PDCCH BD candidates / CCE limits that terminal 20 can monitor is specified / set for combinations of PCell / PSCell slots and SCell slots that include PCell / PSCell slots and SCell slots that have overlapping time positions and do not result in a combination of slots that cross a frame boundary.

[0052] Examples of each option will be described below. In all of the following examples, it is assumed that cross-carrier scheduling from an SCell of band Y to a PCell of band X is configured in terminal 20. It is also assumed that the SCS of the PCell is half the SCS of the SCell, and the slot length of the PCell is twice the slot length of the SCell. However, this assumption is merely an example. For example, the technology according to the present invention can also be applied when the SCS of the PCell is longer than the SCS of the SCell (when the slot length of the PCell is shorter than the slot length of the SCell). In addition, in the slot diagrams of the figures of each example, D, U, and S represent a downlink slot, an uplink slot, and a special slot, respectively. A special slot may include a downlink symbol.

[0053] <Example 1: Option 1> In option 1 of the first embodiment, the number of PDCCH BD candidates / CCE limit that terminal 20 can monitor is specified / set for the combination of the corresponding PCell / PSCell slot and SCell slot specified by the slot offset.

[0054] 7 shows Example 1 of Option 1. In Example 1, the start position (frame boundary) of slot #0 of the PCell and the start position (frame boundary) of slot #0 of the SCell are shifted by a slot offset. Terminal 20 receives the slot offset from base station 10, and can therefore determine from the frame boundary of the SCell that the frame boundary of the PCell (= the start position of slot #0) is the time after the slot offset.

[0055] In Example 1, the number of BDs / CCE limits that terminal 20 can monitor is specified / set for a combination of slot #0 of the PCell and corresponding slots #0 and #1 of the SCell. Regarding the number of BD candidates / CCE limits, for example, a certain value that is counted commonly for slot #0 of the PCell and slots #0 and #1 of the SCell is specified / set.

[0056] In Example 1, for example, if the number of BD candidates is specified / set as 44, terminal 20 monitors a maximum of 44 candidate PDCCHs in slot #0 of the PCell and slots #0 and #1 of the SCell.

[0057] If terminal 20 receives, as a result of monitoring, DCI addressed to terminal 20 that schedules data reception on the PCell in slot #0 of the SCell, data can be received in a certain slot on the PCell according to the information in the DCI.

[0058] Figure 8 shows Example 2 of Option 1. Example 2 differs from Example 1 in the slot offset. Terminal operation is the same as Example 1.

[0059] In option 1, terminal 20 may buffer the PDCCH signal received in the slot where the PDCCH is received earlier in the corresponding combination of PCell / PSCell slot and SCell slot, and perform (attempt to decode) the signal received in the PCell / PSCell slot and the signal received in the SCell slot at the time of the slot where the PDCCH is received later. This type of processing may be applied to all options where there is a time difference between the slots in the combination of PCell / PSCell slot and SCell slot.

[0060] <Example 1: Option 2> In option 2 of the first embodiment, the number of PDCCH BD candidates / CCE limits that terminal 20 can monitor is specified / set for combinations of PCell / PSCell slots and SCell slots that overlap in time position.

[0061] 9 shows Example 1 of Option 2. In Example 1, the start position (frame boundary) of slot #0 of the PCell and the start position (frame boundary) of slot #0 of the SCell are shifted by a slot offset. Terminal 20 receives the slot offset from base station 10, and can therefore determine from the frame boundary of the SCell that the frame boundary of the PCell is the time after the slot offset.

[0062] In Example 1, the number of BDs / CCE limits that terminal 20 can monitor is specified / set for a combination of slot #0 of PCell and slots #4 and #5 of SCell that overlap with slot #0 in time position.

[0063] In Example 1, for example, if the number of BD candidates is specified / set as 44, terminal 20 monitors a maximum of 44 PDCCH candidates in slot #0 of the PCell and slots #4 and #5 of the SCell.

[0064] If terminal 20 receives, as a result of monitoring, DCI addressed to terminal 20 in slot #4 of the SCell that schedules data reception on the PCell, terminal 20 can receive data in a certain slot on the PCell according to the information in the DCI.

[0065] Figure 10 shows Example 2 of Option 2. Example 2 differs from Example 1 in the slot offset. Terminal operation is the same as Example 1.

[0066] In option 2, terminal 20 may assume that PDSCH / PUSCH in a PCell / PSCell is scheduled using a PDCCH (DCI) received in an SCell slot whose time position overlaps with a PCell / PSCell slot as a reference point, based on this PCell / PSCell slot. For example, if terminal 20 receives DCI indicating that data reception will be performed at an offset of "3 slots" in SCell slot #4 whose time position overlaps with PCell / PSCell slot #0, terminal 20 may assume that data will be received in slot #3, which is three slots after PCell / PSCell slot #0 as a reference point.

[0067] <Example 1: Option 3> In option 3 of the first embodiment, the number of PDCCH BD candidates / CCE limits that terminal 20 can monitor is specified / set for a combination of corresponding PCell / PSCell slots and SCell slots that includes PCell / PSCell slots and SCell slots that overlap in time position and does not include multiple slots that straddle a frame boundary.

[0068] Figure 11 shows Example 1 of Option 3. Example 1 of Option 3 operates in the same way as Example 1 of Option 2 (Figure 9).

[0069] Figure 12 shows Example 2 of Option 3. In Example 2, the corresponding combination of PCell slot and SCell slot is PCell slot #0 and SCell slots #2 and #3.

[0070] In Example 2, the number of BDs / CCE limits that terminal 20 can monitor is specified / set for the combination of slot #0 of the PCell and slots #2 and #3 of the SCell corresponding thereto.

[0071] In Example 2, for example, if the number of BD candidates is specified / configured as 44, terminal 20 monitors a maximum of 44 PDCCH candidates in slot #0 of the PCell and slots #2 and #3 of the SCell.

[0072] If terminal 20 receives, as a result of monitoring, DCI addressed to terminal 20 in slot #2 of the SCell that schedules data reception on the PCell, terminal 20 can receive data in a certain slot on the PCell according to the information in the DCI.

[0073] In Example 2, terminal 20 may buffer the PDCCH signal received in the slot where the PDCCH is received earlier in the corresponding combination of PCell / PSCell slot and SCell slot, and perform (attempt to decode) the signal received in the PCell / PSCell slot and the signal received in the SCell slot at the time of the slot where the PDCCH is received later.

[0074] Figure 13 shows Example 3 of Option 3. Example 3 differs from Example 2 in the way slots are combined. That is, in Example 2, an SCell slot that is earlier in time than the PCell slot is combined, whereas in Example 3, an SCell slot that is later in time than the PCell slot is combined. The operation is the same as that of Example 2.

[0075] The technology of the first embodiment described above enables a terminal to appropriately perform PDCCH monitoring related to cross-carrier scheduling without excessive load even when the frame boundaries are different between CCs.

[0076] Example 2 Next, a description will be given of Example 2. In Example 2, when cross-carrier scheduling from an SCell to a Pcell / PSCell between CCs with different slot boundaries is configured in terminal 20, the number of BD candidates / CCE limits of PDCCH that terminal 20 can monitor in a PCell / PSCell slot / SCell slot is specified / set.

[0077] For example, the number of BD candidates / CCE limits of PDCCH that terminal 20 can monitor in a PCell / PSCell slot / SCell slot may be defined in the specifications, and terminal 20 and base station 10 may operate in accordance with the definition.

[0078] The number of BD candidates / CCE limit numbers for the PDCCH described above may be specified for each SCS (or numerology μ) used by terminal 20. Furthermore, the "number of BD candidates / CCE limit numbers" may be only the number of BD candidates, only the number of CCE limits, or both the number of BD candidates and the number of CCE limits.

[0079] In addition, the number of PDCCH BD candidates / CCE limit numbers that terminal 20 can monitor in the PCell / PSCell slot / SCell slot may be notified to terminal 20 by RRC, MAC CE, or DCI from base station 10, and terminal 20 may operate in accordance with the notification.

[0080] In Example 2, options 1 to 3 will be explained. The outline of each is as follows.

[0081] Option 1: The number of PDCCH BD candidates / CCE limit that terminal 20 can monitor is specified / set for the combination of the corresponding PCell / PSCell slot and SCell slot specified by the offset between slot boundaries or the like.

[0082] Option 2: For portions where time positions overlap (for example, OFDM symbols where time positions overlap), the number of PDCCH BD candidates / CCE limit that terminal 20 can monitor is specified / set.

[0083] Option 3: For each combination of PCell / PSCell slots and SCell slots that have overlapping time positions (if there are multiple combinations, for each combination), the number of PDCCH BD candidates / CCE limit that terminal 20 can monitor is specified / set. Option 3 includes the following options 3-1 and 3-2.

[0084] Option 3-1: Terminal 20 may monitor all of the above-mentioned combinations so that the number of PDCCH BD candidates / CCE limit that terminal 20 can monitor is satisfied.

[0085] Option 3-2: For the above multiple combinations, terminal 20 may monitor any of the combinations (which combination may be specified / notified) so that the number of PDCCH BD candidates / CCE limit that terminal 20 can monitor is satisfied.

[0086] Examples of each option will be described below. In all of the following examples, it is assumed that cross-carrier scheduling from an SCell of band Y to a PCell of band X is configured in terminal 20. It is also assumed that the SCS of the PCell is half the SCS of the SCell, and that the slot length of the PCell is twice the slot length of the SCell. However, this assumption is merely an example. For example, the technology according to the present invention can also be applied when the SCS of the PCell is longer than the SCS of the SCell (when the slot length of the PCell is shorter than the slot length of the SCell). In addition, in the slot diagrams of the figures in each example, D, U, and S represent a downlink slot, an uplink slot, and a special slot, respectively. A special slot may include a downlink symbol. In addition, in the description of the following examples, it is assumed that frame boundaries are aligned between CCs.

[0087] <Example 2: Option 1> In option 1 of the first embodiment, the number of PDCCH BD candidates / CCE limit numbers that terminal 20 can monitor are specified / set for the combination of corresponding PCell / PSCell slots and SCell slots specified by the offset between slot boundaries or the like.

[0088] 14 shows an example of Option 1. In this example, the start position (slot boundary) of slot #0 of the PCell and the start position (slot boundary) of slot #0 of the SCell are shifted by an offset. By receiving the offset from base station 10, for example, terminal 20 can determine from the slot boundary of the SCell that the slot boundary of the PCell is after the offset time.

[0089] In the example of FIG. 14, the number of BDs / CCE limits that terminal 20 can monitor is specified / set for the combination of slot #0 of the PCell and slots #0 and #1 of the SCell corresponding thereto.

[0090] In this example, if the number of BD candidates is specified / set as 44, terminal 20 monitors a maximum of 44 PDCCH candidates in slot #0 of the PCell and slots #0 and #1 of the SCell.

[0091] If terminal 20 receives, as a result of monitoring, a DCI addressed to terminal 20 that schedules data reception on the PCell in slot #0 of the SCell, terminal 20 can receive data in a certain slot on the PCell according to the information in the DCI.

[0092] In option 1, terminal 20 may buffer the PDCCH signal received in the slot where the PDCCH is received earlier in the corresponding combination of PCell / PSCell slot and SCell slot, and perform (attempt to decode) the signal received in the PCell / PSCell slot and the signal received in the SCell slot at the time of the slot where the PDCCH is received later.

[0093] <Example 2: Option 2> In option 2 of the second embodiment, the number of PDCCH BD candidates / CCE limit that terminal 20 can monitor is specified / set for the portion where time positions overlap (for example, OFDM symbols where time positions overlap).

[0094] 15 shows an example of option 2. In this example, the start position (slot boundary) of slot #0 of the PCell and the start position (slot boundary) of slot #0 of the SCell are shifted by an offset. By receiving the offset from base station 10, for example, terminal 20 can determine from the slot boundary of the SCell that the slot boundary of the PCell is after the offset time.

[0095] In this example, the portion of the SCell slot that overlaps in time position with slot #0 of the PCell is a portion of slots #0 to #2 of the SCell, as shown in the figure. Note that in this example, the entire PCell slot #0 and the portion of slots #0 to #2 of the SCell are referred to as the "portion that overlaps in time position," but this is an example. For example, the "portion that overlaps in time position" may be a portion of one or more slots of the PCell and the entire one or more slots of the SCell.

[0096] In addition, if the "portion of overlapping time positions" in a PCell slot or an SCell slot is small (for example, if it is below a certain threshold or if it is one symbol), that small portion may be excluded from the "portion of overlapping time positions".

[0097] In this example, the number of BDs / CCE limits that terminal 20 can monitor are specified / set for the "portion where the time positions of the PCell slot and SCell slot overlap."

[0098] In this example, if the number of BD candidates is specified / set as 44, the terminal 20 monitors a maximum of 44 candidate PDCCHs in the "portion where the time positions overlap."

[0099] If terminal 20 receives DCI addressed to terminal 20 that schedules data reception on the PCell as a result of monitoring in the "overlapping time position portion" in slot #0 of the SCell, data can be received in a certain slot on the PCell according to the information in the DCI.

[0100] In option 2, terminal 20 may assume that PDSCH / PUSCH in a PCell / PSCell based on a PCell / PSCell slot is scheduled based on a PDCCH (DCI) received in (all or part of) an SCell slot whose time position overlaps with a PCell / PSCell slot. For example, if terminal 20 receives DCI indicating that data reception will be performed at an offset of "3 slots" in a part of SCell slot #0 whose time position overlaps with PCell / PSCell slot #0, terminal 20 may assume that data will be received in a slot three slots after PCell / PSCell slot #0.

[0101] <Example 2: Option 3> In option 3 of the second embodiment, the number of PDCCH BD candidates / CCE limit that terminal 20 can monitor may be specified / set for each combination of PCell / PSCell slot and SCell slot that has overlapping time positions (for each combination if there are multiple combinations). Option 3 includes the following options 3-1 and 3-2.

[0102] Option 3-1: For all of the above-mentioned combinations, terminal 20 may monitor so that the number of PDCCH BD candidates / CCE limit that terminal 20 can monitor is satisfied.

[0103] Option 3-2: For the above multiple combinations, terminal 20 may monitor any of the combinations (which combination may be specified / notified) so that the number of PDCCH BD candidates / CCE limit that terminal 20 can monitor is satisfied.

[0104] 16 shows an example of option 3. In this example, the start position (slot boundary) of slot #0 of the PCell and the start position (slot boundary) of slot #0 of the SCell are shifted by an offset. By receiving the offset from base station 10, for example, terminal 20 can determine from the slot boundary of the SCell that the slot boundary of the PCell is after the offset time.

[0105] In this example, there are two combinations of PCell / PSCell slots and SCell slots that have overlapping time positions: "the combination of PCell slot #0 and SCell slots #0 and #1" and "the combination of PCell slot #0 and SCell slots #1 and #2."

[0106] In this case, the number of BDs / CCE limits that terminal 20 can monitor is specified / set for the "combination of PCell slot #0 and SCell slots #0 and #1," and the number of BDs / CCE limits that terminal 20 can monitor is specified / set for the "combination of PCell slot #0 and SCell slots #1 and #2."

[0107] In addition, the number of BDs / CCE limits that terminal 20 can monitor may be specified / set for (the combination of "PCell slot #0 and SCell slots #0 and #1" and the combination of "PCell slot #0 and SCell slots #1 and #2").

[0108] The above option 3-1 corresponds to "and" in Fig. 16. In this case, for example, the number of BDs / CCE limits that terminal 20 can monitor are specified / set for (the "combination of PCell slot #0 and SCell slots #0 and #1" and the "combination of PCell slot #0 and SCell slots #1 and #2"). Terminal 20 then monitors within the range of the specified / set number of BDs / CCE limits when monitoring the "combination of PCell slot #0 and SCell slots #0 and #1" and the "combination of PCell slot #0 and SCell slots #1 and #2" (i.e., monitoring PCell slot #0 and SCell slots #0 to #2).

[0109] The above option 3-2 corresponds to "or" in Fig. 16. In this case, for example, the number of BDs / CCE limits that terminal 20 can monitor is specified / set for the "combination of slot #0 of PCell and slots #0 and #1 of SCell," and the number of BDs / CCE limits that terminal 20 can monitor is specified / set for the "combination of slot #0 of PCell and slots #1 and #2 of SCell."

[0110] Then, terminal 20 monitors within the range of the above-mentioned specified / set number of BDs / CCE limits when monitoring "the combination of PCell slot #0 and SCell slots #0 and #1." Alternatively, terminal 20 monitors within the range of the above-mentioned specified / set number of BDs / CCE limits when monitoring "the combination of PCell slot #0 and SCell slots #1 and #2."

[0111] The technology of the second embodiment described above enables a terminal to appropriately perform PDCCH monitoring related to cross-carrier scheduling without excessive load even when slot boundaries differ between CCs.

[0112] (Example common to Examples 1 and 2) For example, in a case where the frame boundaries are shifted between CCs and the slot boundaries are also shifted, the first and second embodiments may be combined and implemented.

[0113] Specifically, any of the options in the first embodiment may be applied to the difference in frame boundaries, and any of the options in the second embodiment may be applied to the difference in slot boundaries.

[0114] Furthermore, for the combination or time range of PCell / PSCell slots and SCell slots in Examples 1 and 2, not only the number of PDCCH BD candidates / CCE limits that terminal 20 can monitor, but also other restrictions, common operations, and common parameters may be specified / configured. For example, the reference point of the scheduling offset when performing cross-carrier scheduling may be specified / configured. For example, the reference point may be the first slot (or the last slot) of the PCell in the combination of PCell / PSCell slots and SCell slots.

[0115] Furthermore, the number of PDCCH BD candidates / CCE limits that terminal 20 can monitor for a combination of PCell / PSCell slots and SCell slots or a time range in Examples 1 and 2 may be any of the following (1) to (2). (1) to (2) will be described with reference to FIG. 17.

[0116] (1) As shown in the examples of Figures 17(a) and (b), the number of BD candidates / CCE limits that terminal 20 can monitor for each PCell / PSCell slot and the number of BDs / CCE limits that terminal 20 can monitor for each SCell slot are respectively determined.

[0117] In the example of FIG. 17(a), the number of BD candidates / CCE limits per slot of the PCell is set to 22, and the number of BD candidates / CCE limits per slot of the SCell (for example, downlink) is set to 22.

[0118] In the example of Figure 17(b), the number of BD candidates / CCE limits per slot of PCell is set to 22, and the number of BD candidates / CCE limits for SCell slots (two slots in the example) combined with one slot of PCell is also set to 22.

[0119] (2) As shown in the example of FIG. 17(c), the number of BD candidates / CCE limits that terminal 20 can monitor, which are counted commonly for PCells and SCells, are specified / set for the above combinations / time ranges.

[0120] 17(c), the number of BD candidates / number of CCE limits is specified / set as 44, and terminal 20 performs monitoring within the illustrated time range, assuming that the total number of BD candidates / number of CCE limits for PCells and SCells is a maximum of 44. In the examples described in the first and second embodiments, such a method is assumed.

[0121] In addition to the above (1) and (2), the number of BD candidates / CCE limit specified / set for one cell (e.g., PCell) may also be applied to the other cell (e.g., SCell).

[0122] Furthermore, multiple options may be combined in both Example 1 and Example 2. For example, terminal 20 may perform monitoring so that the number of PDCCH BD candidates / CCE limit number that terminal 20 can monitor in multiple options is satisfied.

[0123] In both the first and second embodiments, the NW (base station 10) may notify which option to implement. Alternatively, the base station 10 may select which option to implement depending on the UE capability or the contents of the UE report, and set the option to the terminal 20.

[0124] Furthermore, UE capabilities related to this embodiment may be defined, and terminal 20 may notify base station 10 of these capabilities. Examples of UE capabilities include the following (1) to (4).

[0125] (1) UE capabilities may be defined for each of the first and second embodiments, or a common UE capability may be defined.

[0126] As an example, when UE capabilities are defined for each of Example 1 and Example 2, if a terminal 20 reports a UE capability indicating that it has the functionality of Example 1 but does not have the functionality of Example 2 to the base station 10, the base station 10 configures cross-carrier scheduling for the terminal 20 only between CCs where the deviation of the slot boundary is smaller than a threshold value, for example.

[0127] (2) In each of the first and second embodiments, a UE capability may be defined for each option in the embodiment, or a common UE capability may be defined for the options.

[0128] (3) UE capability may be defined for the difference in frame boundary between CCs or the difference in slot boundary between CCs. For example, in relation to the operation of the first embodiment, if the terminal 20 reports to the base station 10 a UE capability indicating that a difference in frame boundary between CCs up to X is acceptable, the base station 10 configures cross-carrier scheduling for the terminal 20 only between CCs whose frame boundary deviation is smaller than X.

[0129] (4) UE capability may be specified for each SCS, each FR, each band, the size of the SCS between the PCell / PSCell and the SCell, each band combination, etc.

[0130] (Device configuration) Next, an example of the functional configuration of the base station 10 and the terminal 20 that execute the processes and operations described above will be described.

[0131] <Base station 10> Fig. 18 is a diagram showing an example of the functional configuration of the base station 10. As shown in Fig. 18, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Fig. 18 is merely an example. The names of the functional divisions and functional units may be any as long as they can execute the operations according to the embodiment of the present invention. Furthermore, the transmitting unit 110 and the receiving unit 120 may be collectively referred to as a communication unit.

[0132] The transmitter 110 has a function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The receiver 120 has a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information of a higher layer from the received signals. The transmitter 110 also has a function of transmitting, to the terminal 20, an NR-PSS, an NR-SSS, an NR-PBCH, a DL / UL control signal, DCI via a PDCCH, data via a PDSCH, and the like.

[0133] The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 in a storage device provided in the setting unit 130, and reads out the information from the storage device as needed.

[0134] The control unit 140 schedules DL reception or UL transmission of the terminal 20 via the transmission unit 110. The control unit 140 also includes a function for performing LBT. The functional unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and the functional unit related to signal reception in the control unit 140 may be included in the reception unit 120. The transmission unit 110 may also be called a transmitter, and the reception unit 120 may also be called a receiver.

[0135] <Terminal 20> Fig. 19 is a diagram showing an example of the functional configuration of the terminal 20. As shown in Fig. 19, the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Fig. 19 is merely an example. As long as the operations related to the embodiment of the present invention can be performed, the names of the functional divisions and functional units may be any. The transmitting unit 210 and the receiving unit 220 may be collectively referred to as a communication unit.

[0136] The transmitter 210 creates a transmission signal from transmission data and transmits the transmission signal wirelessly. The receiver 220 wirelessly receives various signals and acquires a higher layer signal from the received physical layer signal. The receiver 220 also has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals, DCI via PDCCH, data via PDSCH, and the like transmitted from the base station 10. For example, the transmitter 210 may transmit a PSCCH (Physical Sidelink Control Channel), a PSSCH (Physical Sidelink Shared Channel), a PSDCH (Physical Sidelink Discovery Channel), a PSBCH (Physical Sidelink Broadcast Channel), and the like to another terminal 20 as D2D communication, and the receiver 120 may receive the PSCCH, PSSCH, PSDCH, PSBCH, and the like from the other terminal 20.

[0137] The setting unit 230 stores various pieces of setting information received from the base station 10 or other terminals by the receiving unit 220 in a storage device provided in the setting unit 230, and reads the information from the storage device as needed. The setting unit 230 also stores setting information that is set in advance.

[0138] The control unit 240 controls the terminal 20. The functional unit in the control unit 240 related to signal transmission may be included in the transmission unit 210, and the functional unit in the control unit 240 related to signal reception may be included in the reception unit 220. Furthermore, the transmission unit 210 may be called a transmitter, and the reception unit 220 may be called a receiver.

[0139] <Additional Notes> This embodiment provides at least the terminal, base station, and monitoring method shown in the following items 1 to 6. (Section 1) a receiving unit that receives an offset indicating a shift of a frame boundary or a slot boundary between a first cell and a second cell from a base station; a control unit that monitors a downlink control channel within a range of restrictions on a combination of a slot of the first cell and a slot of the second cell, which is specified by the offset; A terminal comprising: (Section 2) a control unit that monitors a downlink control channel within a limited range of a portion where time positions of a first cell and a second cell overlap each other, where there is a shift in a frame boundary or a slot boundary; a receiving unit that receives control information via the downlink control channel; A terminal comprising: (Section 3) a control unit that monitors a downlink control channel within a range of restrictions on a combination of slots of a first cell and a second cell that have a portion where time positions overlap, in a first cell and a second cell that have a shift in a frame boundary or a slot boundary; a receiving unit that receives control information via the downlink control channel; A terminal comprising: (Section 4) Scheduling in the first cell is performed by a downlink control channel in the second cell, and the restriction is a maximum number of candidates for the downlink control channel or a maximum number of unit resources for the downlink control channel. A terminal according to any one of paragraphs 1 to 3. (Section 5) a transmitter that transmits an offset indicating a deviation of a frame boundary or a slot boundary between the first cell and the second cell to a terminal; a control unit that performs scheduling in the first cell using a downlink control channel in the second cell; In the terminal, monitoring of a downlink control channel is performed within a range of restrictions on a combination of the slot of the first cell and the slot of the second cell corresponding to the combination specified by the offset. Base station. (Section 6) receiving an offset from a base station indicating a shift in a frame boundary or slot boundary between the first cell and the second cell; Monitoring a downlink control channel within a range of restrictions on a combination of the slot of the first cell and the slot of the second cell, which is specified by the offset. The monitoring method that the device performs.

[0140] Any of the clauses 1 to 6 provides a technique for a terminal to appropriately perform PDCCH monitoring related to cross-carrier scheduling even when the frame boundary or slot boundary differs between CCs. Clause 4 allows the use of the maximum number of downlink control channel candidates, the maximum number of unit resources for the downlink control channel, etc. as restrictions.

[0141] (Hardware configuration) The block diagrams (FIGS. 18 and 19) used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are connected directly or indirectly (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining the single device or the multiple devices with software.

[0142] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocation, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0143] For example, the base station 10, the terminal 20, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 20 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and the terminal 20 described above may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0144] In the following description, the term "apparatus" can be read as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0145] Each function in the base station 10 and the terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001, the memory device 1002, etc., so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing data in the memory device 1002 and the auxiliary memory device 1003.

[0146] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0147] Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 18 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 19 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0148] The storage device 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The storage device 1002 may also be called a register, a cache, a main memory, etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

[0149] The secondary storage device 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. The above-mentioned storage medium may be, for example, a database, a server, or other suitable medium including at least one of the storage device 1002 and the secondary storage device 1003.

[0150] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, a transmission / reception antenna, an amplifier unit, a transmission / reception unit, a transmission path interface, etc. may be realized by the communication device 1004. The transmission / reception unit may be implemented as a transmission unit and a reception unit that are physically or logically separated.

[0151] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0152] Furthermore, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0153] Furthermore, base station 10 and terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

[0154] Furthermore, the terminal 20 or the base station 10 may be provided in a vehicle 2001. FIG. 21 shows a configuration example of the vehicle 2001. As shown in FIG. 21, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013. Each aspect / embodiment described in the present disclosure may be applied to a communication device mounted on the vehicle 2001, and may be applied to the communication module 2013, for example. The functions of the terminal 20 may be mounted on the communication module 2013.

[0155] The drive unit 2002 is configured, for example, by an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a handle), and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.

[0156] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals are input to the electronic control unit 2010 from various sensors 2021 to 2029 provided in the vehicle 2001. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0157] The signals from the various sensors 2021 to 2029 include a current signal from a current sensor 2021 that senses the current of the motor, a rotation speed signal of the front and rear wheels obtained by a rotation speed sensor 2022, an air pressure signal of the front and rear wheels obtained by an air pressure sensor 2023, a vehicle speed signal obtained by a vehicle speed sensor 2024, an acceleration signal obtained by an acceleration sensor 2025, an accelerator pedal depression amount signal obtained by an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by a brake pedal sensor 2026, a shift lever operation signal obtained by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 2028.

[0158] The information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing various types of information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 2012 uses information obtained from external devices via the communication module 2013, etc., to provide various types of multimedia information and multimedia services to the occupants of the vehicle 2001.

[0159] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driver's driving burden, such as a millimeter-wave radar, a LiDAR (Light Detection and Ranging), a camera, a positioning locator (e.g., GNSS, etc.), map information (e.g., high-definition (HD) map, autonomous vehicle (AV) map, etc.), a gyro system (e.g., an IMU (Inertial Measurement Unit), an INS (Inertial Navigation System), etc.), an AI (Artificial Intelligence) chip, and an AI processor, as well as one or more ECUs that control these devices. The driving assistance system unit 2030 also transmits and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0160] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via the communication port. For example, the communication module 2013 transmits and receives data via the communication port 2033 to and from the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 29, which are provided in the vehicle 2001.

[0161] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station, a mobile station, or the like.

[0162] The communication module 2013 transmits, via wireless communication to an external device, a current signal from the current sensor that is input to the electronic control unit 2010. The communication module 2013 also transmits, via wireless communication to an external device, the rotation speed signals of the front and rear wheels acquired by a rotation speed sensor 2022, the air pressure signals of the front and rear wheels acquired by an air pressure sensor 2023, the vehicle speed signal acquired by a vehicle speed sensor 2024, the acceleration signal acquired by an acceleration sensor 2025, the accelerator pedal depression amount signal acquired by an accelerator pedal sensor 2029, the brake pedal depression amount signal acquired by a brake pedal sensor 2026, the shift lever operation signal acquired by a shift lever sensor 2027, and the detection signals for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 2028, which are input to the electronic control unit 2010.

[0163] The communication module 2013 receives various information (traffic information, traffic signal information, inter-vehicle information, etc.) transmitted from external devices and displays it on an information service unit 2012 provided in the vehicle 2001. The communication module 2013 also stores the various information received from the external devices in a memory 2032 that can be used by the microprocessor 2031. Based on the information stored in the memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, sensors 2021 to 2029, etc. provided in the vehicle 2001.

[0164] (Supplementary explanation of the embodiment) Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention; two or more items may be combined as needed, and items described in one item may apply to items described in another item (unless inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries between physical components. The operations of multiple functional units may be performed by a single physical component, or the operations of a single functional unit may be performed by multiple physical components. The order of the processing steps described in the embodiments may be reversed as long as there is no contradiction. For convenience of processing description, the base station 10 and terminal 20 have been described using functional block diagrams. However, such devices may be implemented using hardware, software, or a combination thereof. The software operated by the processor of the base station 10 in accordance with an embodiment of the present invention and the software operated by the processor of the terminal 20 in accordance with an embodiment of the present invention may each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

[0165] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0166] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark), IEEE 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), or other appropriate systems, and next-generation systems extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.) may also be applied.

[0167] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order and are not limited to the particular order presented.

[0168] In this specification, a specific operation that is described as being performed by the base station 10 may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having the base station 10, it is clear that various operations performed for communication with the terminal 20 may be performed by at least one of the base station 10 and another network node other than the base station 10 (such as, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station 10, the other network node may be a combination of multiple other network nodes (such as an MME and an S-GW).

[0169] The information or signals described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0170] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be sent to another device.

[0171] In the present disclosure, the determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0172] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0173] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0174] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0175] Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0176] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0177] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0178] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0179] In this disclosure, terms such as "base station (BS)," "radio base station," "base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0180] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0181] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0182] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0183] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile body, or the mobile body itself. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0184] Furthermore, a base station in the present disclosure may be read as a terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a terminal is replaced with communication between a plurality of terminals 20 (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0185] Similarly, the term "terminal" in the present disclosure may be read as "base station." In this case, the base station may be configured to have the functions of the terminal described above.

[0186] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0187] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0188] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0189] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0190] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0191] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0192] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0193] A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0194] Numerology may be communication parameters that apply to at least one of transmission and reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, and specific windowing operations performed by the transceiver in the time domain.

[0195] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0196] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0197] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0198] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, or the like instead of a subframe. Furthermore, one slot may be called a unit time. The unit time may differ for each cell depending on the numerology.

[0199] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate wireless resources (such as frequency bandwidth and transmission power that can be used by each terminal 20) to each terminal 20 in TTI units. Note that the definition of TTI is not limited to this.

[0200] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0201] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0202] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0203] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0204] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0205] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0206] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0207] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0208] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0209] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0210] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0211] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0212] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0213] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0214] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0215] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Explanation of symbols]

[0216] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 terminals 210 Transmitter 220 Receiving unit 230 Setting Section 240 Control Unit 1001 processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication equipment 1005 Input Device 1006 Output Device 2001 Vehicle 2002 Drive unit 2003 Steering Section 2004 accelerator pedal 2005 brake pedal 2006 Shift Lever 2007 front wheel 2008 rear wheel 2009 Axle 2010 Electronic Control Unit 2012 Information Services Department 2013 Communication Module 2021 Current Sensor 2022 RPM Sensor 2023 Air Pressure Sensor 2024 Vehicle speed sensor 2025 Acceleration Sensor 2026 Brake pedal sensor 2027 Shift lever sensor 2028 Object Detection Sensor 2029 Accelerator pedal sensor 2030 Driving Assistance Systems Department 2031 microprocessor 2032 memory (ROM, RAM) 2033 Communication port (IO port)

Claims

1. a control unit that monitors a downlink control channel within a limited range of a portion where time positions of a first cell and a second cell overlap each other, where there is a shift in a frame boundary or a slot boundary; a receiving unit that receives control information via the downlink control channel; A terminal comprising:

2. a control unit that monitors a downlink control channel within a range of restrictions on a combination of slots of a first cell and a second cell that have a portion where time positions overlap, in the first cell and the second cell that have a shift in frame boundary or slot boundary; a receiving unit that receives control information via the downlink control channel; A terminal comprising:

3. Scheduling in the first cell is performed by a downlink control channel in the second cell, and the restriction is a maximum number of candidates for the downlink control channel or a maximum number of unit resources for the downlink control channel.

3. The terminal according to claim 1 or 2.

4. Monitoring a downlink control channel within a limit on the overlapping portion of time positions of a first cell and a second cell that have a shift in frame boundary or slot boundary; receiving control information via the downlink control channel; The monitoring method that the device performs.

5. Monitoring a downlink control channel within a range of restrictions on a combination of slots of a first cell and a second cell having a portion where the time positions of the first cell and the second cell are overlapped, where the frame boundary or slot boundary of the first cell and the second cell are misaligned; receiving control information via the downlink control channel; The monitoring method that the device performs.

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