Communication device, communication method, integrated circuit, and base station

Abstract

To provide a technology that enables a terminal to properly detect control information.SOLUTION: A first process (Step 4) of aligning the size of control information between a first format for a first search space and a second format for a second search space, and a second process (Procedure B) of aligning the size of control information between a third format and the first format or the second format are performed in stages.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a communication device, a communication method, an integrated circuit, and a base station. [Background technology]

[0002] A communications system known as the fifth-generation mobile communications system (5G) is currently being considered. For example, it is being considered to flexibly provide functions for individual use cases that require increased communication traffic, an increasing number of connected devices, high reliability, and low latency.

[0003] Three representative examples of services include enhanced Mobile Broadband (eMBB), massive Machine Type Communications (mMTC), and Ultra Reliable and Low Latency Communication (URLLC).

[0004] The Third Generation Partnership Project (3GPP) (registered trademark), an international standardization organization, is studying the advancement of communication systems from the perspectives of both the advancement of LTE (Long Term Evolution) systems and New Radio (NR). [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] R1-1903349 “Summary of 7.2.6.1.1 Potential enhancements to PDCCH,” Huawei, 3GPP TSG RAN WG1 Meeting #96, February 25 - March 1, 2019. [Non-patent document 2] 3GPP TS38.213 V15.5.0 (2019-03) Summary of the Invention

[0006] In order for a terminal to properly detect control information transmitted from a base station, there is room for consideration regarding size adjustment of control information for which multiple formats are defined.

[0007] Non-limiting examples of the present disclosure contribute to providing an improved base station, terminal, and communication method that allow a terminal to properly detect control information.

[0008] A base station according to one embodiment of the present disclosure includes: a control circuit that performs, in a stepwise manner, a first process of aligning a size of control information between a first format for a first search space and a second format for a second search space; and a second process of aligning a size of the control information between a third format and the first format or the second format; a transmission circuit for transmitting the control information.

[0009] A terminal according to one embodiment of the present disclosure includes a control circuit that controls reception of the control information based on information regarding application of a first process that aligns the size of control information between a first format and a second format, and a second process that aligns the size of the control information between a third format and the first format or the second format, and a receiving circuit that receives the control information in accordance with the control.

[0010] A communication method for a base station according to one embodiment of the present disclosure comprises sequentially performing a first process of aligning the size of control information between a first format for a first search space and a second format for a second search space, and a second process of aligning the size of the control information between a third format and the first format or the second format, and transmitting the control information.

[0011] A communication method for a terminal according to one embodiment of the present disclosure controls reception of the control information based on information regarding the application of a first process for aligning the size of control information between a first format for a first search space and a second format for a second search space, and a second process for aligning the size of the control information between a third format and the first format or the second format, and receives the control information in accordance with the control.

[0012] These comprehensive or specific aspects may be realized as a system, an apparatus, a method, an integrated circuit, a computer program, or a recording medium, or may be realized as any combination of a system, an apparatus, a method, an integrated circuit, a computer program, and a recording medium.

[0013] According to one aspect of the present disclosure, a terminal can properly detect control information.

[0014] Further advantages and benefits of certain aspects of the present disclosure will become apparent from the specification and drawings. Such advantages and / or benefits may be provided by some of the embodiments and features described in the specification and drawings, respectively, but not necessarily all of them may be provided to obtain one or more identical features. [Brief explanation of the drawings]

[0015] [Figure 1] Flowchart showing operation example 1-1 according to embodiment 1 [Figure 2] Flowchart showing operation example 1-2 according to embodiment 1 [Figure 3] Flowchart showing operation example 1-3 according to embodiment 1 [Figure 4] Block diagram showing an example of the configuration of a base station [Figure 5] Block diagram showing an example of a terminal configuration [Figure 6] Block diagram showing an example of the configuration of a base station [Figure 7] Block diagram showing an example of a terminal configuration [Figure 8]Flowchart showing an example of operation according to the second embodiment [Figure 9] 10 is a flowchart showing another example of operation according to the second embodiment. [Figure 10] Flowchart showing operation example 2-1-1 according to embodiment 2 [Figure 11] Flowchart showing operation example 2-1-3 according to embodiment 2 [Figure 12] Flowchart showing an example of a method for determining the size of a DCI (Downlink control information) format DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed description of well-known matters or redundant description of substantially identical configurations may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art.

[0017] The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0018] In NR, a control resource set (CORESET) and a search space are configured for a terminal (e.g., User Equipment (UE)) as a PDCCH region, which is one of the control channels that transmits downlink control information (DCI). The UE monitors the search space, which is the location of physical downlink control channel (PDCCH) candidates within the CORESET, to detect DCI. The following eight types of DCI formats are available (e.g., Non-Patent Document 2):

[0019] DCI format 0_0 for the scheduling PUSCH DCI format 0_1 ​​for the scheduling PUSCH DCI format 1_0 for the scheduling PDSCH DCI format 1_1 for the scheduling PDSCH DCI format 2_0 for notifying slot format DCI format 2_1 for preemption DCI format 2_2 for TPC commands for PUCCH and PUSCH DCI format 2_2 for a group of TPC commands for SRS

[0020] Note that "PUSCH" is an abbreviation for "physical uplink shared channel," and "PDSCH" is an abbreviation for "physical downlink shared channel." Also, "TPC" is an abbreviation for "transmission power control," and "SRS" is an abbreviation for "sounding reference signal." Also, in the following, " / " in expressions such as "DCI format 0_0 / 1_0" and "DCI format 0_1 / 1_1" means "and / or."

[0021] DCI format 0_0 / 1_0 may have different DCI format sizes in a common search space (CSS) and a UE specific search space (USS). DCI format 2_2 and DCI format 2_2 are defined to have the same size as DCI format 0_0 / 1_0 in CSS. One of the CSS and the USS may correspond to an example of a first search space, and the other of the CSS and the USS may correspond to an example of a second search space.

[0022] A UE monitors DCI formats that are configured to be monitored by a base station (e.g., gNB). The base station can also cause each UE to monitor a different DCI format. Non-Patent Document 2 specifies that a UE does not need to monitor more than four DCI formats of different sizes. Furthermore, with regard to DCI formats that are masked (in other words, scrambled) by a C-RNTI (cell-radio network temporary identifier), a UE does not need to monitor more than three DCI formats of different sizes. Therefore, the base station configures the DCI format in accordance with these specifications.

[0023] URLLC requires ultra-reliability and low latency, so it is necessary to reduce the error rate of the PDSCH, which is an example of a downlink (DL) data channel. To reduce the error rate of the data channel, it is necessary to reduce the error rate of the PDCCH, which is an example of a control channel. By correctly detecting the PDCCH, the UE can correctly recognize the allocation of the PDSCH, which reduces the error rate of the PDSCH.

[0024] As an example of a method for reducing the error rate of the PDCCH, a method of reducing the size of DCI transmitted in the PDCCH by approximately 10 to 16 bits compared to DCI format 0_0 / 1_0 is being considered (for example, Non-Patent Document 1). On the other hand, a method of making the fields included in the DCI variable by configuring a higher layer and setting the size larger than that of DCI format 0_0 / 1_0 is also being considered.

[0025] Here, if the base station configures a DCI format with a size different from that of an existing (or legacy) DCI format, the number of times the UE attempts to detect the DCI, in other words, the number of blind detections (BDs), may increase.

[0026] In the embodiment described below, an example will be described in which proper DCI detection is achieved in a UE when a base station sets a DCI format with a size different from existing DCI formats.

[0027] (Embodiment 1) In the first embodiment, the sizes of DCI formats are adjusted in stages. For example, in the first stage of processing, the sizes of CSS DCI format 0_0 / 1_0 and USS DCI format 0_0 / 1_0 are made the same. In the second stage of processing, the sizes of a DCI format (hereinafter referred to as a "new DCI format" for convenience) whose extension for URLLC is being considered and other DCI format(s) are made the same. Note that the process of making the sizes of DCI formats the same may be understood as matching, making equal, or aligning the sizes of both.

[0028] According to the two-stage processing, if the total number of different DCI format sizes is less than the standard in the first stage processing, the second stage processing can be skipped (or bypassed). By being able to skip the second stage processing, the DCI size can be maintained at a size suitable for operation.

[0029] Therefore, for example, the error rate of the PDCCH can be reduced. By reducing the error rate of the PDCCH, the error rate of the PDSCH can also be reduced. As a result, the reception quality of the PDCCH and PDSCH at the UE can be improved, and the DL throughput can be improved.

[0030] (An example of how to determine the DCI format size without considering the new DCI format) In DCI format 0_0 / 1_0, the number of bits used for frequency domain resource assignment may vary depending on the expected bandwidth (e.g., band width part, BWP) value. Therefore, the size of DCI format 0_0 / 1_0 is determined according to the BWP value. Furthermore, in DCI format 0_1 / 1_1, in addition to the frequency domain resource assignment bits, there is a field whose number of bits is variable depending on higher layer signaling. Therefore, the size of the DCI format can also be varied depending on higher layer signaling.

[0031] When the new DCI format is not taken into consideration, the method illustrated in the flowchart of Fig. 12 can be considered as an example of a method for determining the size of the DCI format. Fig. 12 illustrates five steps (Steps 0-4).

[0032] In Step 0, the sizes of DCI format 0_0 and DCI format 1_0 in CSS are determined. For example, the size of DCI format 0_0 is determined based on the value of the initial UL BWP (Band width part). Note that "UL" is an abbreviation for "uplink."

[0033] On the other hand, the size of DCI format 1_0 is determined based on the bandwidth of CORESET#0 or the value of the initial DL BWP. If the sizes of DCI format 0_0 and DCI format 1_0 are different from each other, for example, the size of DCI format 0_0 is adjusted (or made uniform) to the size of DCI format 1_0.

[0034] For example, if the size of DCI format 0_0 is smaller than the size of DCI format 1_0, bit 0 is added to DCI format 0_0. If the size of DCI format 0_0 is larger than the size of DCI format 1_0, some of the resource allocation bits in the frequency direction are deleted from DCI format 0_0.

[0035] Note that "adding" bit 0 may be interpreted as other terms such as "padding," "insert," or "prepend." "Deleting" bits may be interpreted as other terms such as "truncation" or "dropping."

[0036] In Step 1, the sizes of DCI format 0_0 and DCI format 1_0 for the USS are determined. For example, the size of DCI format 0_0 is determined based on the value of an active UL BWP, and the size of DCI format 1_0 is determined based on the value of an active DL BWP. If the sizes of DCI format 0_0 and DCI format 1_0 are different from each other, bit 0 is added to the smaller DCI format to match the larger DCI format.

[0037] In Step 2, the sizes of DCI format 0_1 ​​and DCI format 1_1 for the USS are determined. The size of DCI format 0_1 ​​is determined based on the value of the active UL BWP. Note that the size of DCI format 0_1 ​​is set to a size different from the size of DCI format 0_0 in USS. The size of DCI format 1_1 is determined based on the value of the active DL BWP. Note that the size of DCI format 1_1 is set to a size different from the size of DCI format 1_0 in USS.

[0038] In Step 3, the following two conditions are checked. If both conditions are met, the process can end. If either of the two conditions is not met, the process proceeds to Step 4. (Condition A) The total number of different DCI format sizes is not greater than X1. (Condition B) The total number of different DCI format sizes monitored using the C-RNTI is not greater than X2. It should be noted that X1 and X2 are both integers of 1 or more, and in Non-Patent Document 2, X1=4 and X2=3.

[0039] In Step 4, the size of the CSS DCI format 0_0 / 1_0 and the size of the USS DCI format 0_0 / 1_0 are adjusted to match each other. For example, the size of the CSS DCI format 0_0 / 1_0 is adjusted to match (align) with the size of the USS DCI format 0_0 / 1_0. The USS DCI format 0_0 / 1_0 is assumed to have the same BWP as the CSS.

[0040] (Example 1-1) Next, an operation example 1-1 according to the first embodiment will be described with reference to the flowchart in FIG.

[0041] As illustrated in Fig. 1, in Operation Example 1-1, Step 2.1 is executed between Step 2 and Step 3 shown in Fig. 12. Step 2.1 corresponds to the process of determining the size of a new DCI format. Furthermore, in Operation Example 1-1, Procedure A (Step 5) and Procedure B (Step 6) are executed after Step 4 shown in Fig. 12.

[0042] Procedure A (Step 5) corresponds to a process of determining whether or not to align the size of the new DCI format with other DCI formats. Procedure B (Step 6) corresponds to a process of aligning the size of the new DCI format with other DCI format(s) (hereinafter, this may be referred to as a "size adjustment process"), depending on the determination result of "align the size" in Procedure A (Step 5). An example of the "other DCI format(s)" will be described later. Note that in Operation Example 1-1, the new DCI format is, for example, masked (scrambled) by an RNTI different from the C-RNTI.

[0043] In Step 2.1 of Figure 1, the size of the new DCI format is determined. The new DCI format is monitored by a terminal (e.g., UE) that has received a monitoring instruction from a base station (e.g., gNB) at a higher layer. It is assumed that the new DCI format is monitored in one or both of the USS and the CSS. The UE may be instructed by higher layer signaling, for example, as to which search space of the USS or the CSS the UE will monitor the new DCI format in.

[0044] Also, it is possible to assume that the new DCI format is supported only for one of USS and CSS (e.g., USS). Also, it is possible to assume that the New DCI format supports one or both of a control signal (e.g., DL assignment) for allocating DL PDSCH and a control signal (e.g., UL grant) for allocating UL PUSCH. Therefore, for the UE, it is assumed that both control signals are monitored and that only one of the two control signals is monitored. Note that "control signal" may be read as "control information".

[0045] Also, the size of the New DCI format can be different depending on the field set by the upper layer. For example, the size of the DCI format is variable depending on the number of bits used in each of the 20 fields illustrated below.

[0046] <An example of a field set for the New DCI format> (1)Frequency domain resource assignment (2)Time domain resource assignment (3)Modulation and coding scheme (4)HARQ process number (5)Redundancy version (6)PUCCH resource indicator (7)PDSCH-to-HARQ_feedback timing indicator (8)Downlink assignment index (9)Antenna port(s) (10)Transmission configuration indication (11)Rate matching indicator (12) SRS request (13)PRB bundling size indicator (14) Carrier indicator (15) CSI request (16) ZP CSI-RS triggering (17) Beta offset indicator (18) SRS resource indicator (19) Repetition factor (20) Priority indication

[0047] Note that "HARQ" is an abbreviation for "hybrid automatic repeat request," "PRB" is an abbreviation for "physical resource block," "CSI" is an abbreviation for "channel state information," and "ZP CSI-RS" is an abbreviation for "zero power channel state information - reference signal."

[0048] The settings for the above fields may be the same or different between DL assignment and DL grant. The size may also differ depending on the settings of UL BWP and DL BWP. If the BWP differs between CSS and USS, the size of the New DCI format for CSS and USS may also differ.

[0049] After Step 2.1, Step 3 is executed, and if Step 3 is judged as NO, Step 4 is executed, and then Step 5 (Procedure A) is executed. In Step 5 (Procedure A), for example, condition A "the total number of different DCI format sizes is not greater than X1" is confirmed.

[0050] In addition, in operation example 1-1, it is assumed that the new DCI format is masked by an RNTI different from the C-RNTI, and therefore, in Step 5 (Procedure A), judgment condition B regarding X2 in Step 3 (the total number of sizes of different DCI formats monitored using the C-RNTI is not larger than X2) does not need to be included. If the new DCI format is masked by the C-RNTI, judgment condition B regarding X2 in Step 3 may be included in Step 5 (Procedure A).

[0051] In Step 5 (Procedure A), if it is determined that Condition A is satisfied (Step 5; YES), the processing of Operation Example 1-1 may end. On the other hand, if it is determined that Condition A is not satisfied (Step 5; NO), the processing proceeds to Step 6 (Procedure B).

[0052] In Step 6 (Procedure B), the size of the new DCI format is aligned with the sizes of other DCI format(s). For example, the size of the new DCI format is aligned with the size of one or more of the DCI format(s) listed below. DCI format 0_0 / 1_0 in CSS DCI format 0_0 / 1_0 in USS DCI format 0_1 ​​in USS DCI format 1_1 in USS

[0053] Also, if Step 4 is performed before moving to Procedure B (Step 6), DCI format 0_0 / 1_0 in CSS and DCI format 0_0 / 1_0 in USS are considered to be the same size.

[0054] Furthermore, in Procedure B, the fact that the size of the new DCI format and the size of the other DCI format(s) are aligned can also be understood as the fact that the size of the other DCI format(s) is aligned with the size of the new DCI format.

[0055] As described above, in operation example 1-1, after the process of adjusting the size of DCI format 0_0 / 1_0 of the CSS and the size of DCI format 0_0 / 1_0 of the USS (Step 4), the process of adjusting the size of the new DCI format with other DCI formats (Step 6; Procedure B) is performed. In other words, the process of adjusting the size of DCI format 0_0 / 1_0 of the CSS and the size of DCI format 0_0 / 1_0 of the USS is performed before the process of adjusting the size of the new DCI format with other DCI formats.

[0056] Therefore, if it is determined in the first determination process (Step 3) that the total number of DCI formats of different sizes exceeds the specified value X1 (NO), the process of "aligning the size of DCI format 0_0 / 1_0 in CSS with the size of DCI format 0_0 / 1_0 in USS" in Step 4 is performed preferentially.

[0057] Therefore, if it is determined in the second determination process (Step 5) that the total number of DCI formats of different sizes is within the specified value X1, Step 6 (Procedure B) is skipped (or bypassed).

[0058] By skipping Step 6 (Procedure B), the size of the new DCI format does not need to be changed (or adjusted). Therefore, for example, if a DCI (which may be conveniently referred to as "Compact DCI") having a size smaller than the sizes of other DCI formats is set in the new DCI format for URLLC, the new DCI format can be operated with its small size. This makes it possible to maintain the reception quality of the new DCI format at the UE. In other words, it is possible to suppress or prevent a decrease in the reception quality of the new DCI format at the UE due to size adjustment of the new DCI format.

[0059] (Example 1-2) Next, an operation example 1-2 according to the first embodiment will be described with reference to the flowchart in FIG.

[0060] In operation example 1-2, unlike operation example 1-1, a determination process (Step 2.2; Procedure A) and a size adjustment process (Step 2.3; Procedure B) are executed before Step 4 (for example, between Step 2 and Step 3).

[0061] Step 2.2 (Procedure A) corresponds to a process of determining whether or not to align the size of the new DCI format with other DCI formats, and Step 2.3 (Procedure B) corresponds to a process of aligning the size of the new DCI format with other DCI formats. Note that in Fig. 2, Step 2.1 is the same as Step 2.1 in Operation Example 1-1 in Fig. 1.

[0062] In the operation example 1-2, similarly to the operation example 1-1, it is assumed that the new DCI format is masked (scrambled) by an RNTI different from the C-RNTI. Below, an operation example focusing on processes (Step 2.2 and Step 2.3) different from the operation example 1-1 will be described.

[0063] In Step 2.2 (Procedure A), for example, Condition A "the total number of different DCI format sizes is not greater than X1" is confirmed.

[0064] Note that, in operation example 1-2 as well, similarly to operation example 1-1, it is assumed that the new DCI format is masked by an RNTI different from the C-RNTI, and therefore, in Step 2.2 (Procedure A), judgment condition B regarding X2 (the total number of sizes of different DCI formats monitored using the C-RNTI is not larger than X2) does not need to be included. When the new DCI format is masked by the C-RNTI, judgment condition B regarding X2 may be included in Step 2.2 (Procedure A).

[0065] In Step 2.2 (Procedure A), if it is determined that Condition A is satisfied (Step 2.2; YES), the processing of Operation Example 1-2 may end. On the other hand, if it is determined that Condition A is not satisfied (Step 2.2; NO), the processing proceeds to Step 2.3 (Procedure B).

[0066] In Step 2.3 (Procedure B), the size of the new DCI format is aligned with the size of other DCI format(s), similar to Step 6 in Fig. 1. For example, the size of the new DCI format is aligned with the size of one or more of the DCI format(s) exemplified below. DCI format 0_0 / 1_0 in CSS DCI format 0_0 / 1_0 in USS DCI format 0_1 ​​in USS DCI format 1_1 in USS

[0067] In the operational example 1-2, after Step 2.3 (Procedure B), Step 3 and Step 4 illustrated in FIG. 1 are executed.

[0068] As described above, in operation example 1-2, the process of aligning the size of the new DCI format with the sizes of other DCI formats (Step 2.3; Procedure B) is performed before Step 4 illustrated in Fig. 1. In other words, the process of aligning the size of the new DCI format with the sizes of other DCI formats is performed before the process of aligning the sizes of DCI format 0_0 / 1_0 of the CSS and DCI format 0_0 / 1_0 of the USS.

[0069] Therefore, if it is determined in the first judgment process (Step 2.2) that the total number of DCI formats of different sizes exceeds the specified value X1 (NO), the process of "aligning the size of the new DCI format with that of other DCI formats" in Step 2.3 is performed preferentially.

[0070] Therefore, if it is determined in Step 2.2 (Procedure A) that the total number of DCI formats of different sizes is within the specified value X1, Step 4 (Procedure B) is skipped (or bypassed).

[0071] By skipping Step 4, the sizes of the CSS DCI format 0_0 / 1_0 and the USS DCI format 0_0 / 1_0 do not need to be the same. Therefore, for example, if the USS BWP is wider than the CSS BWP, the BWP that can be specified in the USS DCI format 0_0 / 1_0 can be a separate BWP for the USS without matching it to the CSS BWP. Therefore, for example, flexible resource allocation is possible in the USS DCI format 0_0 / 1_0.

[0072] (Example 1-3) Next, operation examples 1-3 according to Embodiment 1 will be described with reference to the flowchart of FIG. 3. Operation examples 1-3 can be regarded as modified examples combining the elements of operation examples 1-1 and 1-2 described above.

[0073] For example, as shown in FIG. 3, in operation example 1-3, before Step 2.2 of operation example 1-2 (for example, between Step 2.1 and Step 2.2), Step 2.1.1 is executed. In Step 2.1.1, it is determined (or confirmed) whether or not condition B "the total number of sizes of different DCI formats monitored using C-RNTI is not greater than X2" is satisfied. This condition B corresponds to a part of the conditions in Step 3 in operation example 1-2. Therefore, in operation example 1-3, in Step 3.1, condition A among conditions A and B is confirmed.

[0074] If it is determined in Step 2.1.1 that condition B is satisfied (Step 2.1.1; YES), the process proceeds to Step 2.2 (Procedure A). On the other hand, if it is determined in Step 2.1.1 that condition B is not satisfied (Step 2.1.1; NO), the process proceeds to Step 4.1. Step 4.1 is the same process as Step 4 in operation examples 1-1 and 1-2.

[0075] In Step 2.2 (Procedure A), if it is determined that condition A is satisfied (Step 2.2; YES), the process of operation example 1-3 may end. On the other hand, if it is determined that condition A is not satisfied (Step 2.2; NO), the process proceeds to Step 2.3 (Procedure B).

[0076] In Step 2.3 (Procedure B), similar to operation example 1-2, the size of the new DCI format is aligned with the sizes of other DCI format(s).

[0077] After this size adjustment, in Step 3.1, it is again determined (or confirmed) whether or not Condition A "the total number of different DCI format sizes is not greater than X1" is satisfied. If it is determined that Condition A is satisfied (Step 3.1; YES), the process may end. If it is determined that Condition A is not satisfied (Step 3.1; NO), the process proceeds to Step 4.

[0078] In Step 4 and Step 4.1, similarly to Operational Example 1-1 and Operational Example 1-2, for example, the size of DCI format 0_0 / 1_0 of the CSS and the size of DCI format 0_0 / 1_0 of the USS are aligned.

[0079] The processing of Operation Example 1-3 may end after Step 4. Meanwhile, after Step 4.1, in Step 5 (Procedure A), for example, condition A "the total number of different DCI format sizes is not greater than X1" is determined (or confirmed).

[0080] In Step 5 (Procedure A), if it is determined that Condition A is satisfied (Step 5; YES), the processing of Operation Example 1-3 may end. On the other hand, if it is determined that Condition A is not satisfied (Step 5; NO), the processing proceeds to Step 6 (Procedure B).

[0081] In Step 6 (Procedure B), the size of the new DCI format is aligned with the size of the other DCI format(s). After Step 6 (Procedure B), the processing of Operation Example 1-3 may end.

[0082] The above has described operation example 1-3. In operation example 1-2, Step 2.2 (Procedure A) and Step 2.3 (Procedure B) are executed before Step 4. Therefore, regardless of the total number of different DCI format sizes monitored using C-RNTI, the size of the new DCI format is adjusted when the total number of different DCI format sizes is greater than X1.

[0083] In contrast, in operation example 1-3, before Step 4 and Step 4.1, it is checked whether part of the condition in Step 3 (condition B), that is, "the total number of sizes of different DCI formats monitored using C-RNTI is not greater than X2," is met.

[0084] If it is determined that condition B is not satisfied, the sizes of DCI format 0_0 / 1_0 in the CSS and DCI format 0_0 / 1_0 in the USS are aligned in Step 4 or Step 4.1. The reason why condition B is checked before condition A is that, if a new DCI format is not masked by the C-RNTI, size adjustment between different DCI formats monitored using the C-RNTI cannot be achieved by aligning the size of the new DCI format with other DCI format(s).

[0085] In addition, by aligning the sizes of CSS DCI format 0_0 / 1_0 and USS DCI format 0_0 / 1_0, the total number of different DCI format sizes can be reduced. Therefore, as described in Operation Example 1-1, it may be possible to complete the process by skipping Step 5 (Procedure A) to Step 6 (Procedure B).

[0086] Furthermore, in Operation Example 1-2 or Operation Example 1-3, before Step 4, the size of the new DCI format may be aligned with the size of DCI format 0_0 / 1_0 of the USS. Then, when proceeding to Step 4, the size of the new DCI format is also aligned with the size of the new DCI format of the CSS. For example, if the new DCI format is smaller than the size of DCI format 0_0 / 1_0 of the CSS, bits are added to the new DCI format to adjust the size of the new DCI format to the same size as DCI format 0_0 / 1_0 of the CSS. The added bits may be zero (zero padding) or other known bits (sequences). If the new DCI format is larger than the size of DCI format 0_0 / 1_0 of the CSS, the size of the new DCI format for CSS may be adjusted to that of DCI format 0_0 / 1_0 of the CSS by deleting specified bits, such as frequency allocation bits of the new DCI format. As mentioned above, the act of removing this bit is also called "truncation."

[0087] (Wireless communication system configuration) A wireless communication system according to one embodiment of the present disclosure includes, for example, a base station 100 (e.g., gNB) shown in FIGS. 4 and 6, and a terminal 200 (e.g., UE) shown in FIGS. 5 and 7.

[0088] In the base station 100 shown in FIG. 4, the control unit 112 determines the DCI format and adjusts the size of the DCI format according to, for example, operation example 1-1, operation example 1-2, or operation example 1-3, and generates DCI addressed to the terminal 200.

[0089] The transmitting unit 107 transmits the DCI generated by the control unit 112 to the terminal 200.

[0090] On the other hand, in terminal 200 shown in FIG. 5, receiving section 201 receives the DL signal transmitted by base station 100.

[0091] For example, the control unit 212 extracts a higher layer signal from a received DL signal, and sets the DCI format to be received based on information about the DCI format indicated by the higher layer signal, and adjusts the size of the DCI format according to the setting.

[0092] (Configuration of base station 100) The base station 100 shown in Fig. 6 includes, for example, a DCI format determination unit 101, a DCI format size adjustment unit 102, and a DCI generation unit 103. The DCI format determination unit 101, the DCI format size adjustment unit 102, and the DCI generation unit 103 may be considered to correspond to an example of the control unit 112 shown in Fig. 4. The base station 100 shown in Fig. 6 also includes, for example, an error correction coding unit 104, a modulation unit 105, a signal allocation unit 106, a transmission unit 107, a reception unit 108, a signal separation unit 109, a demodulation unit 110, and an error correction decoding unit 111.

[0093] The error correction coding unit 104, the modulation unit 105, the signal allocation unit 106, and the transmission unit 107 may be considered to correspond to an example of a transmission processing unit that performs DL transmission processing, and the reception unit 108, the signal separation unit 109, the demodulation unit 110, and the error correction decoding unit 111 may be considered to correspond to an example of a reception processing unit that performs UL reception processing.

[0094] For example, DCI format determination section 101 determines the DCI format that base station 100 uses for terminal 200 for each cell (for example, SpCell and SCell). Note that "SpCell" is an abbreviation for "special cell," and "SCell" is an abbreviation for secondary cell. An "SpCell" is, for example, a primary cell (PCell) or a primary secondary cell (PSCell).

[0095] Information about the DCI format determined for each cell by DCI format determination section 101 is output to, for example, error correction coding section 104 and DCI format size adjustment section 102. Note that the DCI format information output to error correction coding section 104 may be considered to correspond to an example of information notified to terminal 200 by higher layer signaling.

[0096] DCI format size adjustment section 102 determines which DCI format terminal 200 is to monitor for each cell, for example, based on DCI format information (hereinafter also referred to as "configuration information") input from DCI format determination section 101. For example, in the case of an SpCell, the DCI format configuration information may include configuration information such as "monitor DCI format 0_0 / 1_0 in CSS."

[0097] The DCI format size adjustment unit 102 determines whether to adjust the size of the DCI format based on the DCI format setting information, as shown in Operation Example 1-1, Operation Example 1-2, or Operation Example 1-3, and adjusts the size of the DCI format according to the determination result. Information on the DCI format after the size adjustment is output to, for example, the DCI generation unit 103.

[0098] Based on the DCI format information input from DCI format size adjustment section 102, DCI generation section 103 generates, for example, DCI that is a control signal for allocating DL data and DCI that is a control signal for allocating UL data.

[0099] The generated DCI is output as an example of transmission data to signal allocation section 106. For example, DCI for allocating DL data is output to signal allocation section 106. DCI for allocating UL data is output to signal separation section 109 in addition to signal allocation section 106 as an example of a control signal indicating the position where the UL data is allocated.

[0100] Error correction coding section 104 receives, for example, a transmission data signal (DL data signal) and higher layer signaling as input, performs error correction coding on the input signal, and outputs the result to modulation section 105 .

[0101] The modulation unit 105 performs modulation processing on the signal input from the error correction coding unit 104, for example, and outputs the modulated data signal to the signal allocation unit .

[0102] Signal allocating section 106 allocates, for example, a DL data signal and DCI, which is an example of a control signal input from DCI generating section 103, to radio resources to form a transmission signal. The formed transmission signal is output to transmitting section 107.

[0103] The transmitter 107 performs radio transmission processing such as up-conversion and amplification on the input signal from the signal allocation unit 106 to generate a radio signal, and transmits the radio signal from an antenna.

[0104] The receiving unit 108 receives, for example, an UL radio signal transmitted from the terminal 200 by an antenna, performs radio reception processing such as amplification and down-conversion on the received radio signal, and outputs the result to the signal separating unit 109.

[0105] Signal separating section 109 separates (or extracts) received signals (e.g., UL data signals) allocated to UL radio resources, based on, for example, UL resource allocation information input from DCI generating section 103. The separated UL data signals are output to demodulating section 110.

[0106] The demodulation unit 110 performs demodulation processing on the input signal from the signal separation unit 109 , for example, and outputs the demodulated signal to the error correction decoding unit 111 .

[0107] For example, error correction decoding section 111 decodes the input signal from demodulation section 110 and outputs a UL received data signal from terminal 200.

[0108] (Configuration of terminal 200) 7 includes, for example, receiving section 201, signal separating section 202, DCI receiving section 203, demodulating section 204, and error correction decoding section 205. Terminal 200 also includes, for example, DCI format setting receiving section 206, DCI format size adjusting section 207, error correction coding section 208, modulating section 209, signal allocating section 210, and transmitting section 211.

[0109] The receiving unit 201, signal separating unit 202, DCI receiving unit 203, demodulating unit 204, and error correction decoding unit 205 may be considered to correspond to an example of a receiving processing unit that performs DL receiving processing. The DCI format setting receiving unit 206 and DCI format size adjusting unit 207 may be considered to correspond to an example of the control unit 212 illustrated in Fig. 5. The error correction coding unit 208, modulating unit 209, signal allocating unit 210, and transmitting unit 211 may be considered to correspond to an example of a transmission processing unit that performs UL transmitting processing.

[0110] The receiving unit 201 receives a DL received signal by an antenna, performs radio reception processing such as amplification and down-conversion on the received signal, and then outputs the received signal to the signal separating unit 202.

[0111] For example, signal separating section 202 separates signals allocated to PDCCH candidate positions from the received signal input from receiving section 201, and outputs the separated signals to DCI receiving section 203. Furthermore, signal separating section 202 separates DL data signals from the received signal based on DL resource allocation information input from DCI receiving section 203, and outputs the separated DL data signals to demodulating section 204.

[0112] DCI receiving unit 203 detects DCI in the output of signal separating unit 202, based on, for example, information about the DCI format (for example, type and / or size) input from DCI format size adjusting unit 207. Furthermore, DCI receiving unit 203 decodes and receives the detected DCI.

[0113] The decoded DCI information is selectively output to, for example, signal separation section 202 and signal allocation section 210. For example, in the decoded DCI information, DL resource allocation information is output to signal separation section 202, and UL resource allocation information is output to signal allocation section 210.

[0114] The demodulation unit 204 performs demodulation processing on the input signal from the signal separation unit 202 , for example, and outputs the demodulated signal to the error correction decoding unit 205 .

[0115] The error correction decoding unit 205 decodes the demodulated signal input from the demodulation unit 204, and outputs a received data signal. Here, the signaling of the higher layer is output to the DCI format setting receiving unit 206, for example.

[0116] The DCI format setting receiver 206 sets the DCI format to be used for each cell based on, for example, higher layer signaling input from the error correction decoder 205 , and outputs the setting information to the DCI format size adjuster 207 .

[0117] DCI format size adjustment section 207 determines which DCI format to monitor for each cell, similar to base station 100, based on, for example, DCI format configuration information input from DCI format configuration receiver 206. Note that if the cell is an SpCell, the DCI format configuration information may include, for example, a setting to monitor DCI format 0_0 / 1_0 in the CSS.

[0118] After determining the DCI format to be monitored, the DCI format size adjustment unit 207 determines whether to adjust the size of the DCI format, and adjusts the size of the DCI format according to the result of the determination, as shown in, for example, operation example 1-1, operation example 1-2, or operation example 1-3. Information about the DCI format after the size adjustment is output to the DCI reception unit 203.

[0119] For example, the error correction coding section 208 receives as input a UL transmission data signal, performs error correction coding on the input transmission data signal, and outputs the coded signal to the modulation section 209 .

[0120] Modulation section 209 modulates the signal input from error correction coding section 208 and outputs the modulated signal to signal allocation section 210 .

[0121] For example, based on UL resource allocation information input from DCI receiving unit 203, signal allocation unit 210 identifies radio resources to be allocated to UL data signals, and allocates the UL data signals to the identified radio resources.

[0122] The transmitter 211 performs radio transmission processing such as up-conversion and amplification on the input signal from the signal allocation unit 210 to generate a radio signal, and transmits the radio signal from an antenna.

[0123] (Supplementary information for the first embodiment) Which of the above-described operation examples 1-1, 1-2, and 1-3 is to be used (or applied) in base station 100 and terminal 200 may be determined in advance or may be selected according to operation conditions. Also, which of operation examples 1-1 to 1-3 is to be used may be determined by signaling of an upper layer.

[0124] Furthermore, in the first embodiment, it is assumed that the new DCI format is masked by an RNTI different from the C-RNTI, but it may also be masked by the C-RNTI. In this case, information for distinguishing between the existing DCI format and the new DCI format (for example, an identification bit) may be added to one or both of the individual DCI formats. The identification bit makes it possible to identify or distinguish between the existing DCI format and the new DCI format even if they have the same size.

[0125] In addition, when the new DCI format is masked by the C-RNTI, "Procedure A" in Operation Example 1-1 and Operation Example 1-2 (Figure 2) may have the same judgment conditions as Step 3, with the addition of a restriction on the total number of different sizes related to the C-RNTI (Condition B).

[0126] Furthermore, in Operation Example 1-1, Operation Example 1-2, and Operation Example 1-3, the values ​​X1 and X2 relating to the total number of different DCI format sizes may be determined by a higher layer setting, or may be predetermined values.

[0127] Furthermore, in the first embodiment, a DCI format extended for URLLC is assumed as an example of a new DCI format, but a DCI format extended for other purposes or uses may also be considered a "new DCI format." Non-limiting examples of DCI formats extended for other purposes or uses include DCI formats for unlicensed bands, machine-type communication (MTC), narrowband-internet of things (NB-IoT), vehicle-to-everything (V2X), and multiple-input and multiple-output (MIMO).

[0128] In addition, in Operation Example 1-1 and Operation Example 1-2, in Step 3, if both of the following two conditions A and B are met, the process proceeds in the direction of "YES," and if either one of the two conditions A and B is not met, the process proceeds in the direction of "NO" (Step 4). (Condition A) The total number of different DCI format sizes is not greater than X1. (Condition B) The total number of different DCI format sizes monitored using C-RNTI is not greater than X2.

[0129] However, the same applies even if the conditions A and B are replaced with, for example, the following conditions A1 and B1, respectively. (Condition A1) The total number of different DCI format sizes is less than or equal to X1. (Condition B1) The total number of different DCI format sizes monitored using C-RNTI is less than or equal to X2

[0130] Alternatively, conditions A and B may be replaced with the following conditions A2 and B2, respectively, and if at least one of conditions A2 and B2 is satisfied, proceed to Step 4, and if neither condition A2 nor B2 is satisfied, proceed in the other direction. (Condition A2) The total number of different DCI format sizes is greater than X1 (Condition B2) The total number of different DCI format sizes monitored using C-RNTI is greater than X2

[0131] Also, in "Procedure A," if condition A "the total number of different DCI format sizes is not greater than X1" is met, the process proceeds to "YES," and if not, the process proceeds to "NO" (Procedure B). However, the same operation is possible even if condition A is replaced with condition A1 "the total number of different DCI format sizes is equal to or less than X1."

[0132] Also, in "Procedure A," if condition A2 "the total number of different DCI format sizes is greater than X1" is satisfied, the procedure may proceed in the direction of "Procedure B," and if the condition is not satisfied, the procedure may proceed in the other direction.

[0133] (Embodiment 2) In the second embodiment, an example of "Procedure B" in the first embodiment will be described. In Procedure B, the size of the new DCI format is made equal to that of other DCI format(s). This satisfies Condition A, which states that "the total number of different DCI format sizes is not greater than X1."

[0134] In the second embodiment, it is assumed that the following relationship exists between the sizes of the DCI formats. size of DCI format 0_0 / 1_0 in CSS <= size of DCI format 0_0 / 1_0 in USS <= size of DCI format 0_1 ​​and 1_1 in USS

[0135] Furthermore, when both a new DCI format for a DL grant and a new DCI format for a UL grant are configured, the following settings (1) to (3) are assumed.

[0136] (1) The new DCI format for DL ​​grants and the new DCI format for UL grants are set to the same size. This makes it possible to suppress the increase in size of different DCI formats due to the addition of new DCI formats.

[0137] (2) The new DCI format for the DL grant and the new DCI format for the UL grant can be set to different sizes, but they are adjusted to the same size before processing Procedure B. By making the new DCI format and the DCI format for the UL grant the same size before processing Procedure B, if Condition A, "the total number of different DCI format sizes is not greater than X1," is satisfied, Procedure B is skipped. In this way, if there is room for different DCI format sizes, different DCI format sizes can be set for the DL assignment and the UL grant, which can reduce padding bits, for example.

[0138] (3) The new DCI format for the DL grant and the new DCI format for the UL grant can be set to different sizes, and Procedure B is performed for either the new DCI format for the DL grant or the new DCI format for the UL grant. If Condition A ("the total number of different DCI format sizes is not greater than X1") is satisfied, Procedure B for the other new DCI format is skipped. If Condition A ("the total number of different DCI format sizes is not greater than X1") is not satisfied, Procedure B is performed for the other new DCI format. It may be predetermined which of the new DCI formats for the DL grant or the UL grant Procedure B is performed (or applied) for first, or it may be specified that Procedure B is performed for the smaller or larger size. In this way, if Condition A ("the total number of different DCI format sizes is not greater than X1") is satisfied when adjusting the size of one of the new DCI formats, the other new DCI format can maintain its set size.

[0139] In addition, it is also possible that a setting is made to monitor both the new DCI format for USS and the new DCI format for CSS, and that their sizes are different. In this case, the following settings (1) to (3) are assumed, as in the case where the sizes are different between the DL assignment and the UL grant.

[0140] (1) The new DCI format for CSS and the new DCI format for USS are the same size. This reduces the size of different DCI formats that increases with the addition of new DCI formats.

[0141] (2) The new DCI format for CSS and the new DCI format for USS can be set to different sizes, but they are adjusted to the same size before processing Procedure B. If condition A "the total number of different DCI format sizes is not greater than X1" is satisfied by adjusting the new DCI formats for CSS and USS to the same size before processing Procedure B, Procedure B is skipped. In this way, if there is room for different DCI format sizes, the new DCI format for CSS and the new DCI format for USS can be set to different sizes, thereby reducing padding bits.

[0142] (3) The new DCI format for CSS and the new DCI format for USS can be set to different sizes, and Procedure B is performed for either the new DCI format for CSS or the new DCI format for USS. If condition A ("the total number of different DCI format sizes is not greater than X1") is satisfied, Procedure B for the other new DCI format is skipped. If condition A ("the total number of different DCI format sizes is not greater than X1") is not satisfied, Procedure B is performed for the other new DCI format. Which of the new DCI formats for CSS and USS is to be performed (or applied) first may be determined in advance, or it may be specified that Procedure B is performed for the new DCI format with the smaller or larger size. In this way, if condition A ("the total number of different DCI format sizes is not greater than X1") is satisfied when adjusting the size of one of the new DCI formats, the other new DCI format can maintain its set size.

[0143] FIG. 8 is a flowchart showing an example of operation according to the second embodiment.

[0144] In Procedure B-0, it is determined whether the size of the new DCI format is equal to or smaller than the size of DCI format 0_0 / 1_0 of the USS. If the size of the new DCI format is equal to or smaller than the size of DCI format 0_0 / 1_0 of the USS (YES), the process proceeds to Procedure B-1. If the size of the new DCI format is larger than the size of DCI format 0_0 / 1_0 of the USS (NO), the process proceeds to Procedure B-2.

[0145] In Procedure B-1, the size of the new DCI format is adjusted to the size of DCI format 0_0 / 1_0. An example of this will be explained in Operation Example 2-1 below.

[0146] In Procedure B-2, it is determined whether the size of the new DCI format is equal to or smaller than the size of the DCI format 0_1 / 1_1 of the USS. If the size of the new DCI format is equal to or smaller than the size of the DCI format 0_1 / 1_1 of the USS (YES), the process proceeds to Procedure B-3, and if the size is larger than the size of the DCI format 0_1 / 1_1 of the USS (NO), the process proceeds to B-4.

[0147] In Procedure B-3, the size of the new DCI format is adjusted to the size of DCI format 0_1 / 1_1. An example of this will be explained in Operation Example 2-2 below.

[0148] In Procedure B-4, the size of DCI format 0_1 ​​or DCI format 1_1 is adjusted to the size of the new DCI format. An example of this will be described later in Operation Example 2-3.

[0149] According to the operation shown in Figure 8, if the size of the new DCI format is smaller than the size of other DCI format(s), the size is adjusted to match the size of the DCI format that is larger than the size of the new DCI format but smaller among the other DCI format(s), thereby reducing the number of padding bits.

[0150] Furthermore, even if the size of a new DCI format is larger than the size of other DCI format(s), the size can be made the same as that of other DCI format(s) by using Procedure B-4. Therefore, the restrictions on the number of bits that can be set for the new DCI format can be reduced (in other words, relaxed).

[0151] Note that the above-described Procedure B-4 may be replaced by the following Procedure B-5, as illustrated in FIG. Procedure B-5: Delete some of the setting bits of the new DCI format to match the size of the new DCI format with the size of other DCI format(s). An example of this will be explained in operation example 2-4 below.

[0152] (Example 2-1) In Operation Example 2-1, an example of Procedure B-1 shown in Figures 8 and 9 will be described. Non-limiting examples of Operation Example 2-1 include three Operation Examples 2-1-1 to 2-1-3. Which of Operation Examples 2-1-1 to 2-1-3 is to be applied may be determined in advance or may be determined by signaling in a higher layer.

[0153] (Example 2-1-1) Operation example 2-1-1 can be applied to Step 2.3 (Procedure B) of operation example 1-2 and Step 2.3 (Procedure B) of operation example 1-3 in the first embodiment.

[0154] In operation example 2-1-1, it is assumed that DCI format_0_0 / 1_0 of the CSS and DCI format_0_0 / 1_0 of the USS have different sizes, and the size of DCI format_0_0 / 1_0 of the CSS is smaller than the size of DCI format_0_0 / 1_0 of the USS.

[0155] FIG. 10 shows a flowchart of the operation example 2-1-1. In Procedure B-1-1, it is determined whether the size of the new DCI format is equal to or smaller than the size of the CSS DCI format_0_0 / 1_0. If the size of the new DCI format is equal to or smaller than the size of the CSS DCI format_0_0 / 1_0 (YES), the process proceeds to Procedure B-1-2. If the size of the new DCI format is larger than the size of the CSS DCI format_0_0 / 1_0 (NO), the process proceeds to Procedure B-1-3.

[0156] In Procedure B-1-2, bits are added to the new DCI format to adjust the size of the new DCI format to the same size as DCI format 0_0 / 1_0 of the CSS. The added bits may be zero (zero padding) or other known bits (sequence). By adding zeros or known bits (sequence), for example, the UE can use the zeros or known bits (sequence) for error detection when detecting DCI. This reduces the reception error rate of DCI.

[0157] In Procedure B-1-3, bits are added to the new DCI format to adjust the size of the new DCI format to the same size as the USS DCI format 0_0 / 1_0. The added bits may be zero (zero padding) as in Procedure B-1-2, or other known bits (sequences).

[0158] In operation example 2-1-1, the size of the new DCI format is matched to a smaller DCI format, so the number of bits added to the new DCI format can be reduced, thereby improving the reception quality of the new DCI format compared to other operation examples.

[0159] When a USS and a CSS overlap each other, the number of blind detections (BDs) of DCI in the UE can be reduced by aligning the size of the new DCI format set in the USS with the size of the DCI format in the CSS. For example, the number of BDs of DCI can be counted as one if the DCI formats have the same size even if they have different RNTIs. When a USS and a CSS do not overlap each other, the total number of different DCI format sizes can be reduced by aligning the size of the new DCI format set in the USS with the size of the DCI format in the CSS.

[0160] (Example 2-1-2) Operation example 2-1-2 can be applied to all Procedure B in Operation examples 1-1, 1-2, and 1-3 in embodiment 1. In Operation example 2-1-2, Procedure B-1-3 shown in FIG. 10 is applied alone. In Procedure B-1-3, even if a new DCI format is set in the USS and a size smaller than the size of DCI format 0_0 / 1_0 in the CSS is set, the size can be made uniform to DCI format 0_0 / 1_0 in the USS. Therefore, when the USS and the CSS overlap each other, the number of times that the UE detects a BD can be reduced.

[0161] (Example 2-1-3) Operation example 2-1-3 can be applied to Step 2.3 (Procedure B) of operation example 1-2 and Step 2.3 (Procedure B) of operation example 1-3 in the first embodiment.

[0162] In operation example 2-1-3, it is assumed that the DCI format_0_0 / 1_0 of the CSS and the DCI format_0_0 / 1_0 of the USS are different sizes, and that the size of the DCI format_0_0 / 1_0 of the CSS is smaller than the size of the DCI format_0_0 / 1_0 of the USS. It is also assumed that a new DCI format can be set for the CSS, and that the sizes of the new DCI format and the new DCI format of the USS can differ from each other.

[0163] FIG. 11 shows a flowchart of the operation example 2-1-3. In Procedure B-1-1', it is determined whether the new DCI format is for CSS and whether the size of the new DCI format for CSS is equal to or smaller than the size of DCI format_0_0 / 1_0 for CSS. If the new DCI format is for CSS and the size of the new DCI format for CSS is equal to or smaller than the size of DCI format_0_0 / 1_0 for CSS (YES), the process proceeds to Procedure B-1-2'. If the size of the new DCI format for CSS is larger than the size of DCI format_0_0 / 1_0 for CSS (NO), the process proceeds to Procedure B-1-3. In other words, even if the new DCI format is for CSS, if its size is larger than DCI format_0_0 / 1_0 for CSS, the process proceeds to Procedure B-1-3. If the new DCI format is for USS, the process proceeds to Procedure B-1-3 regardless of its size.

[0164] In Procedure B-1-2', bits are added to the new DCI format for CSS to adjust the new DCI format for CSS to the same size as DCI format 0_0 / 1_0 for CSS. The added bits may be zero (zero padding) as in Procedure B-1-2, or other known bits (sequences).

[0165] Procedure B-1-3 is the same as Operational Example 2-1-1 and Operational Example 2-1-2. For example, Procedure B-1-3 adjusts the new DCI format to the same size as USS DCI format 0_0 / 1_0 by adding bits to the new DCI format. The added bits may be zero (zero padding), as in Procedure B-1-2, or may be other known bits (sequences).

[0166] According to operation example 2-1-3, when the sizes of DCI format 0_0 / 1_0 for CSS and DCI format 0_0 / 1_0 for USS are different, the new DCI format for CSS can be adjusted to the size of DCI format 0_0 / 1_0 for CSS, and the new DCI format for USS can be adjusted to the size of DCI format 0_0 / 1_0 for USS. When the search spaces of the new DCI format and DCI format 0_0 / 1_0 in CSS and USS overlap, respectively, the number of BDs performed by the UE can be reduced.

[0167] In operation example 2-1-3, in procedure B-1-1', the size of the new DCI format for CSS is compared with the size of DCI format 0_0 / 1_0 for CSS. If the size of the new DCI format for CSS is larger than the size of DCI format 0_0 / 1_0 for CSS, the new DCI format for CSS is adjusted to the size of DCI format 0_0 / 1_0 for USS. However, the new DCI format for CSS may also be adjusted to the size of DCI format 0_1 / 1_0 for CSS regardless of its size.

[0168] Furthermore, if the size of the new DCI format for CSS is larger than that of DCI format 0_0 / 1_0 for CSS, the size of the new DCI format for CSS may be adjusted to that of DCI format 0_0 / 1_0 for CSS by deleting specified bits, such as frequency allocation bits of the new DCI format. This operation of deleting bits is also called "truncation," as described above.

[0169] Furthermore, if the size of the new DCI format for CSS is larger than the size of the DCI format 0_0 / 1_0 for CSS, detection of the new DCI format for CSS may be stopped.

[0170] The bit deletion and DCI detection stop methods do not change the size of the CSS DCI format 0_0 / 1_0. Therefore, even if the UE does not detect (or cannot read) the DCI format for USS due to, for example, reconfiguration of the upper layer, the UE can continue communication using the CSS DCI format 0_0 / 1_0.

[0171] In the operational example 2-1, it is assumed that the size of DCI format 0_0 / 1_0 in CSS <= the size of DCI format 0_0 / 1_0 in USS <= the size of DCI format 0_1 ​​and 1_1 in USS, but the relationship between the sizes of each DCI format is not limited to this assumption.

[0172] For example, the relationship may be assumed: size of new DCI format < size of DCI formats 0_1 and 1_1 in USS < size of DCI formats 0_0 and 1_0 in USS. In this case, in Procedure B3, the new DCI format may be adjusted to the size of DCI formats 0_1 and 1_1 in USS.

[0173] (Example 2-2) In Operation Example 2-2, an example of Procedure B-3 shown in Figures 8 and 9 will be described. Non-limiting examples of Operation Example 2-2 include five Operation Examples 2-2-1 to 2-2-5. Which of Operation Examples 2-2-1 to 2-2-5 is to be applied may be determined in advance or may be determined by signaling in a higher layer.

[0174] (Example 2-2-1) In operation example 2-2-1, the new DCI format for DL ​​assignment or the new DCI format for UL grant is larger than the new DCI format, and its size is adjusted to the smaller of DCI format 0_1 ​​(for UL grant) and DCI format 1_1 (for DL ​​assignment).

[0175] Therefore, size adjustment is performed on both the new DCI format for DL ​​assignment and the new DCI format for UL grant. If the size of the new DCI format is smaller than the smaller of DCI format 0_1 ​​and DCI format 1_1, the new DCI formats for DL ​​assignment and UL grant will have the same size.

[0176] According to the operational example 2-2-1, the size of the new DCI format is adjusted to the smaller size of DCI format 0_1 ​​or DCI format 1_1, so that the padding bits can be reduced.

[0177] (Example 2-2-2) In operation example 2-2-2, the size of the new DCI format for DL ​​assignment is adjusted to DCI format 1_1 (DL assignment), and the size of the new DCI format for UL grant is adjusted to DCI format 0_1 ​​(for UL grant). If DCI format 1_1 or DCI format 0_1 ​​is not configured, the size of the new DCI format may be adjusted to the size of the configured DCI format.

[0178] According to Operation Example 2-2-2, the size of DL control signals can be adjusted, and the size of UL control signals can be adjusted. Therefore, even if the UL BWP is changed, the size of DL control signals can be continuously used without being changed. In other words, the UE can continue blind detection of DL control signals.

[0179] (Example 2-2-3) In operation example 2-2-3, the size of both the new DCI format for DL ​​assignment and the new DCI format for UL grant is adjusted to match that of DCI format 1_1. If DCI format 1_1 is not set, or if the size of the new DCI format is larger than that of DCI format 1_1 and is equal to or smaller than that of DCI format 0_1, the size of the new DCI format DCI for DL ​​assignment and the new DCI format for UL grant may be adjusted to match that of format 0_1.

[0180] According to operation example 2-2-3, even if the UL BWP is changed, there are cases where size change does not need to be performed if the new DCI format for the UL grant is matched to the size of DCI format 1_1.

[0181] (Example 2-2-4) In operation example 2-2-4, the size of the new DCI format for DL ​​assignment is matched to that of DCI format 0_1 ​​(for UL grant), and the size of the new DCI format for UL grant is matched to that of DCI format 1_1 (for DL ​​assignment). If DCI format 1_1 or DCI format 0_1 ​​is not configured, the new DCI format DCI may be matched to the configured DCI format.

[0182] According to Operation Example 2-2-4, the size of the DL control signal and the UL control signal are matched. If the size of the DL control signal and the UL control signal are close (for example, if the difference in size is equal to or less than a threshold), the number of padding bits may be reduced.

[0183] (Example 2-2-5) In operation example 2-2-5, the size of both the new DCI format for DL ​​assignment and the new DCI format for UL grant is adjusted to match that of DCI format 0_1. If DCI format 0_1 ​​is not set, or if the size of the new DCI format is larger than that of DCI format 0_1 ​​and equal to or smaller than that of DCI format 1_1, the size of the new DCI format DCI for DL ​​assignment and the new DCI format for UL grant may be adjusted to match that of format 1_1.

[0184] According to operation example 2-2-5, even if the DL BWP is changed, there are cases where size change does not need to be performed if the new DCI format for the UL grant is matched to the size of DCI format 0_1.

[0185] (Example 2-3) In Operation Example 2-3, an example of Procedure B-4 shown in Fig. 8 will be described. Non-limiting examples of Operation Example 2-3 include five Operation Examples 2-3-1 to 2-3-5. Which of Operation Examples 2-3-1 to 2-3-5 is to be applied may be determined in advance or may be determined by signaling of a higher layer.

[0186] (Example 2-3-1) In operation example 2-3-1, DCI format 0_1 ​​(for UL grant) or DCI format 1_1 (for DL ​​assignment) is larger than DCI format 0_1 ​​(for UL grant) or DCI format 1_1 (for DL ​​assignment), and its size is adjusted to the smaller of DCI format 0_1 ​​(for UL grant) and DCI format 1_1 (for DL ​​assignment).

[0187] Therefore, when size adjustment is performed for both DCI format 1_1 and DCI format 0_1, and the size of the smaller of the new DCI formats is also smaller than DCI format 1_1, DCI format 1_1 and DCI format 0_1 ​​will have the same size.

[0188] According to operation example 2-3-1, the size of DCI format 0_1 ​​(for UL grant) or DCI format 1_1 (for DL ​​assignment) is adjusted to the new DCI format of smaller size, thereby reducing padding bits.

[0189] (Example 2-3-2) In operation example 2-3-2, the size of the new DCI format for DL ​​assignment is matched to DCI format 1_1 (for DL ​​assignment), and the size of the new DCI format for UL grant is matched to DCI format 0_1 ​​(for UL grant). If DCI format 1_1 or DCI format 0_1 ​​is not configured, the size of the new DCI format may be matched to the size of the configured DCI format.

[0190] According to Operation Example 2-3-2, the sizes of the DL control signals are adjusted to match each other, and the sizes of the UL control signals are adjusted to match each other, so even if the UL BWP is changed, the DL control signals can continue to be used without being changed in size. In other words, the UE can continue blind detection of the DL control signals.

[0191] (Example 2-3-3) In operation example 2-3-3, the sizes of both DCI format 1_1 and DCI format 0_1 ​​are adjusted to match the new DCI format for DL ​​assignment. If a new DCI format for DL ​​assignment has not been configured, or if the size of DCI format 1_1 or DCI format 0_1 ​​is larger than the size of the new DCI format for DL ​​assignment and equal to or smaller than the size of the DCI format for UL grant, the sizes of DCI format 1_1 and DCI format 0_1 ​​may be adjusted to match the new DCI format for UL grant.

[0192] According to operation example 2-3-3, even if there is a change in UL BWP, there may be cases where it is not necessary to change the size if the size of DCI format 0_1 ​​is matched with the size of DCI for DL ​​assignment.

[0193] (Example 2-3-4) In operation example 2-3-4, the size of the new DCI format for DL ​​assignment is matched to DCI format 0_1 ​​(for UL grant), and the size of the new DCI format for UL grant is matched to DCI format 1_1 (for DL ​​assignment). If DCI format 1_1 or DCI format 0_1 ​​is not configured, the size of the new DCI format may be matched to the configured DCI format.

[0194] According to Operation Example 2-3-4, the size of the DL control signal and the UL control signal are matched. If the size of the DL control signal and the UL control signal are close (for example, if the difference in size is equal to or less than a threshold), the number of padding bits may be reduced.

[0195] (Example 2-3-5) In operation example 2-3-3, the sizes of both DCI format 1_1 and DCI format 0_1 ​​are adjusted to match the new DCI format for UL grant. If a new DCI format for UL grant has not been configured, or if the size of DCI format 1_1 or DCI format 0_1 ​​is larger than the size of the new DCI format for UL grant and equal to or smaller than the size of the DCI format for DL ​​assignment, the sizes of DCI format 1_1 and DCI format 0_1 ​​may be adjusted to match the new DCI format for DL ​​assignment.

[0196] According to operation example 2-3-5, even if there is a change in DL BWP, there may be cases where it is not necessary to change the size if the size of DCI format 0_1 ​​is matched with the size of DCI for UL grant.

[0197] (Example 2-4) In operation example 2-4, an example of Procedure B-5 shown in Fig. 9 will be described. Non-limiting examples of operation example 2-4 include five operation examples 2-4-1 to 2-4-5. Which of operation examples 2-4-1 to 2-4-5 is to be applied may be determined in advance or may be determined by signaling of a higher layer.

[0198] (Example 2-4-1) In operation example 2-4-1, the size of the new DCI format is adjusted to the largest DCI format among DCI format 0_0 / 1_0 for CSS, DCI format 0_0 / 1_0 for USS, DCI format 0_1, and DCI format 1_1. Therefore, in operation example 2-4-1, by deleting specified bits in the fields of the new DCI format, the size of the new DCI format is adjusted to match that of the DCI format specified as the same size (truncation).

[0199] An example of a bit that is designated for deletion is a bit for resource allocation in the frequency direction. According to operation example 2-4-1, the size of the new DCI format is matched to the larger size DCI format, so the number of bits to be deleted can be reduced.

[0200] (Example 2-4-2) In operation example 2-4-2, the size of the new DCI format for DL ​​assignment is adjusted to match that of DCI format 1_1 (for DL ​​assignment), and the size of the new DCI format for UL grant is adjusted to match that of DCI format 0_1 ​​(for UL grant). If DCI format 1_1 or DCI format 0_1 ​​is not configured, the size of the new DCI format may be adjusted to match that of the configured DCI format. For example, the size of the new DCI format is adjusted by deleting specified bits in the fields of the new DCI format.

[0201] According to Operation Example 2-4-2, the sizes of the DL control signals are adjusted to match each other, and the sizes of the UL control signals are adjusted to match each other, so even if the UL BWP is changed, the DL control signals can continue to be used without being changed in size. In other words, the UE can continue blind detection of the DL control signals.

[0202] (Example 2-4-3) In operation example 2-4-3, the size of both the new DCI format for DL ​​assignmetn and the new DCI format for UL grant is adjusted to match that of DCI format 1_1. If DCI format 1_1 is not set, or if the size of the new DCI format is larger than that of DCI format 1_1 and equal to or smaller than that of DCI format 0_1, the size of the new DCI format may be adjusted to match that of DCI format 0_1. For example, the size of the new DCI format is adjusted by deleting specified bits in the fields of the new DCI format.

[0203] According to operation example 2-4-3, even if the UL BWP is changed, there are cases where the size change does not need to be performed if the new DCI format for the UL grant is adjusted to the size of DCI format 1_1.

[0204] (Example 2-4-4) In operation example 2-4-4, the size of the new DCI format for DL ​​assignment is adjusted to match that of DCI format 0_1 ​​(for UL grant), and the size of the new DCI format for UL grant is adjusted to match that of DCI format 1_1 (for DL ​​assignment). If DCI format 1_1 or DCI format 0_1 ​​is not configured, the size of the new DCI format may be adjusted to match that of the configured DCI format. For example, the size of the new DCI format is adjusted by deleting specified bits in the fields of the new DCI format.

[0205] According to the operation example 2-4-4, the size of the DL control signal and the UL control signal are made the same. If the size of the DL control signal and the UL control signal are close (for example, if the difference in size is equal to or less than a threshold), the number of padding bits may be reduced.

[0206] (Example 2-4-5) In operation example 2-4-5, the size of both the new DCI format for DL ​​assignmetn and the new DCI format for UL grant is adjusted to match that of DCI format 0_1. If DCI format 0_1 ​​is not set, or if the size of the new DCI format is larger than that of DCI format 0_1 ​​and equal to or smaller than that of DCI format 1_1, the size of the new DCI format may be adjusted to match that of DCI format 1_1. For example, the size of the new DCI format is adjusted by deleting specified bits in the fields of the new DCI format.

[0207] According to operation example 2-4-5, even if there is a change in DL BWP, there are cases where size change does not need to be performed if the new DCI format for DL ​​assignment is matched to the size of DCI format 0_1.

[0208] (Example 2-5) In operation example 2-5, among the DCI format(s) shown below, the ones with the closest sizes are adjusted to the same size. DCI format 0_0 / 1_0 DCI format 0_1 DCI format 1_1 New DCI format for UL grant New DCI format for DL ​​assignment

[0209] In Step 2.3 (Procedure B) of Operation Example 1-2 and Step 2.3 (Procedure B) of Operation Example 1-3 of Embodiment 1, if the DCI format 0_0 / 1_0 of the CSS and the DCI format 0_0 / 1_0 of the USS are different, the sizes of the DCI format 0_0 / 1_0 of the CSS and the DCI format 0_0 / 1_0 of the USS may be distinguished, and those with similar sizes may be adjusted to the same size.

[0210] When aligning the size to CSS DCI format 0_0 / 1_0, the bits of the other DCI format are reduced to align the size to CSS DCI format 0_0 / 1_0. For other combinations, bits are added to the smaller DCI format to align it to the larger DCI format.

[0211] According to the operational example 2-5, the number of padding bits used for size adjustment and the number of bits deleted for size adjustment can be reduced.

[0212] (Example 2-6) In operation example 2-6, information indicating which DCI format(s) the size of the new DCI format should be aligned with is notified to terminal 200 from base station 100 by higher layer signaling, for example.

[0213] If the new DCI format is larger than the size of a DCI format that is specified as the same size, the following operations may be performed by terminal 200. -Do not detect new DCI format as an error case. · Deletes specified bits, such as frequency allocation bits, of the new DCI format to match the size with the specified DCI format (truncation). Add bits to a DCI format that is specified as the same size to align it to the new DCI format.

[0214] (General supplementary information) When the new DCI format for DL ​​assignment and the new DCI format for UL grant are of the same size, a bit for distinguishing between them (identification bit) may be added to one or both of the new DCI formats for DL ​​assignment and UL grant. Also, even when the new DCI format for DL ​​assignment and the new DCI format for UL grant are of different sizes, a bit for distinguishing between them (identification bit) may be added in advance to one or both of the new DCI formats for DL ​​assignment and UL grant. Adding an identification bit in advance makes it possible to distinguish between the new DCI format for DL ​​assignment and the new DCI format for UL grant by the identification bit, for example, in relation to a DCI format assigned later, even when size adjustment is not required.

[0215] Although a PDCCH signal has been given as an example of a control signal, the above-described embodiments may be applied to control signals with other names. For example, the above-described embodiments may be applied to control channel signals with other names, such as an enhanced PDCCH (EPDCCH), a relay-PDCCH (R-PDCCH), or an MTC PDCCH (MPDCCH).

[0216] The PDCCH may be transmitted from the same carrier as the PDSCH, which is called self-carrier scheduling, or may be transmitted from a different carrier than the PDSCH, which is called cross-carrier scheduling.

[0217] A "carrier" may also be referred to as a "subcarrier" or a "component carrier." One or more BWPs may be configured for a UE within one carrier. Also, a "carrier" may be read as a "cell" or a "BWP."

[0218] The term "condition" may be replaced with other terms such as "criterion," "rule," "norm," or "method." Furthermore, the term "determination" may be replaced with other terms such as "decision," "assessment," "calculation," or "processing."

[0219] Furthermore, the notation "··· part" used in the above-described embodiments may be replaced with other notations, such as "··· circuitry," "··· device," "··· unit," or "··· module."

[0220] Furthermore, the use of terms such as "first" and "second" in this disclosure (including the claims and abstract) is merely for convenience in distinguishing between two or more elements to which the terms are attached, and does not limit the number (quantity) or order of each element. For example, a reference to a first and a second element does not mean that only two elements may be employed, or that the first element must precede the second element.

[0221] The present disclosure can be realized by software, hardware, or software linked to hardware. Each functional block used in the description of the above embodiments may be partially or entirely realized as an LSI, which is an integrated circuit, and each process described in the above embodiments may be partially or entirely controlled by a single LSI or a combination of LSIs. The LSI may be composed of individual chips, or may be composed of a single chip that includes some or all of the functional blocks. The LSI may have data input and output. Depending on the degree of integration, the LSI may be called an IC, system LSI, super LSI, or ultra LSI.

[0222] Furthermore, the method of integration is not limited to LSI, but may be realized by dedicated circuits, general-purpose processors, or dedicated processors. Also, FPGAs (Field Programmable Gate Arrays), which can be programmed after LSI manufacturing, or reconfigurable processors, which allow the connections and settings of circuit cells within LSIs to be reconfigured, may be used. The present disclosure may be realized as digital processing or analog processing.

[0223] Furthermore, if an integrated circuit technology that can replace LSI emerges due to advances in semiconductor technology or other derivative technologies, it is natural that such technology can be used to integrate functional blocks. The application of biotechnology, etc. is also a possibility.

[0224] The present disclosure may be implemented in any type of apparatus, device, or system with communications capabilities (collectively referred to as communications apparatus), including, but not limited to, telephones (e.g., cell phones, smartphones), tablets, personal computers (PCs) (e.g., laptops, desktops, notebooks), cameras (e.g., digital still / video cameras), digital players (e.g., digital audio / video players), wearable devices (e.g., wearable cameras, smartwatches, tracking devices), game consoles, digital book readers, telehealth / telemedicine devices, communications-enabled vehicles or mobile transportation (e.g., cars, airplanes, ships), and combinations of the above.

[0225] Communications equipment is not limited to portable or mobile equipment, but also includes non-portable or fixed equipment, devices, and systems of any kind, such as smart home devices (such as appliances, lighting equipment, smart meters or metering devices, control panels, etc.), vending machines, and any other "things" that may exist on an IoT (Internet of Things) network.

[0226] Communications include data communications via cellular systems, wireless LAN systems, communications satellite systems, etc., as well as data communications via combinations of these.

[0227] A communications apparatus also includes devices such as controllers and sensors connected or coupled to a communications device that performs the communications functions described in this disclosure, such as controllers and sensors that generate control and data signals used by the communications device to perform the communications functions of the communications apparatus.

[0228] The communication apparatus also includes infrastructure facilities, such as base stations, access points, and any other apparatus, device, or system that communicates with or controls the various apparatuses listed above, but are not limited to these.

[0229] Summary of this disclosure A base station according to the present disclosure includes a control circuit that performs, in stages, a first process of aligning the size of control information between a first format for a first search space and a second format for a second search space, and a second process of aligning the size of the control information between a third format and the first format or the second format, and a transmission circuit that transmits the control information.

[0230] In the base station according to the present disclosure, the control circuit may perform the first processing before the second processing.

[0231] In the base station according to the present disclosure, the control circuit may perform the second process before the first process.

[0232] Furthermore, in a base station according to the present disclosure, the control circuit may determine, after the first processing, whether the condition that the total number of the different sizes does not exceed a predetermined value is satisfied, and may perform the second processing if the condition that the total number of the different sizes does not exceed a predetermined value is not satisfied.

[0233] Furthermore, in the base station according to the present disclosure, before the second processing, the control circuit determines whether the condition that the total number of the different sizes does not exceed a predetermined value is satisfied, and performs the second processing if the condition that the total number of the different sizes does not exceed a predetermined value is not satisfied.

[0234] Furthermore, in the base station according to the present disclosure, in the second processing, the control circuit may align the size of the control information to the size of the first format or the second format, which is larger than the size of the third format.

[0235] Furthermore, in a base station according to the present disclosure, in the second processing, the control circuit may align the size of the control information for downlink or uplink to a format that is larger than the size of the third format and is smaller than the size of the first format or the second format for downlink and uplink.

[0236] A terminal according to the present disclosure includes a control circuit that controls reception of the control information based on information regarding application of a first process that aligns the size of control information between a first format and a second format, and a second process that aligns the size of the control information between a third format and the first format or the second format, and a receiving circuit that receives the control information in accordance with the control.

[0237] A communication method for a base station according to the present disclosure transmits the control information by sequentially performing a first process of aligning the size of control information between a first format for a first search space and a second format for a second search space, and a second process of aligning the size of the control information between a third format and the first format or the second format.

[0238] A communication method for a terminal according to the present disclosure controls reception of the control information based on information regarding the application of a first process for aligning the size of control information between a first format for a first search space and a second format for a second search space, and a second process for aligning the size of the control information between a third format and the first format or the second format, and receives the control information in accordance with the control. [Industrial Applicability]

[0239] The present disclosure is suitable for, for example, a wireless communication system. [Explanation of symbols]

[0240] 100 base stations 101 DCI format determination section 102 DCI format size adjustment section 103 DCI generation section 104 Error correction coding unit 105 Modulation section 106 Signal allocation unit 107 Transmitter 108 Receiving unit 109 Signal separation section 110 Demodulation section 111 Error correction decoding unit 200 devices 201 Receiving unit 202 Signal separation section 203 DCI receiver 204 Demodulation section 205 Error correction decoding unit 206 DCI format setting receiver 207 DCI format size adjustment section 208 Error correction coding unit 209 Modulation section 210 Signal allocation unit 211 Transmitter

Claims

1. a receiver configured, in operation, to receive one or more signals; a circuit unit coupled to the receiver unit, the circuit unit configured, in operation, to monitor the one or more signals for a plurality of downlink control information (DCI) formats, including: Equipped with the plurality of DCI formats include DCI format 0_0, DCI format 1_0, a first DCI format used for scheduling a physical uplink shared channel (PUSCH), and a second DCI format used for scheduling a physical downlink shared channel (PDSCH); The first DCI format and the second DCI format are different from any of the following DCI formats: DCI format 0_0 DCI format 0_1 DCI format 1_0 DCI format 1_1 DCI format 2_0 DCI format 2_1 DCI format 2_2 The plurality of DCI formats monitored by the circuit unit are a first condition that a first total number of different DCI sizes in the plurality of DCI formats is equal to or less than a predetermined first number; and a second condition that a second total number of different DCI sizes in the plurality of DCI formats identified by a cell-radio network temporary identifier (C-RNTI) is equal to or less than a predetermined second number; or a third condition that the size of DCI format 0_0 is the same as the size of DCI format 1_0; and a fourth condition that the size of a first DCI format is determined based on the size of one of the plurality of DCI formats. Meet any of the following conditions: Communication equipment.

2. The size of the first DCI format is adjusted based on the size of the second DCI format. The communication device according to claim 1.

3. The DCI format 0_0 and the DCI format 1_0 are monitored in a user equipment (UE) specific search space (USS). The communication device according to claim 1 .

4. The first DCI format and the second DCI format are monitored in a USS and are not monitored in a common search space (CSS). The communication device according to claim 1 .

5. The first DCI format and the second DCI format are newer than any of the following DCI formats: DCI format 0_0, DCI format 0_1, DCI format 1_0, DCI format 1_1, DCI format 2_0, DCI format 2_1, DCI format 2_2, The communication device according to claim 1 .

6. receiving one or more signals; monitoring the one or more signals for a plurality of downlink control information (DCI) formats, including: Including, the plurality of DCI formats include DCI format 0_0, DCI format 1_0, a first DCI format used for scheduling a physical uplink shared channel (PUSCH), and a second DCI format used for scheduling a physical downlink shared channel (PDSCH); The first DCI format and the second DCI format are different from any of the following DCI formats: DCI format 0_0 DCI format 0_1 DCI format 1_0 DCI format 1_1 DCI format 2_0 DCI format 2_1 DCI format 2_2 The plurality of DCI formats to be monitored are a first condition that a first total number of different DCI sizes in the plurality of DCI formats is equal to or less than a predetermined first number; and a second condition that a second total number of different DCI sizes in the plurality of DCI formats identified by a cell-radio network temporary identifier (C-RNTI) is equal to or less than a predetermined second number; or a third condition that the size of DCI format 0_0 is the same as the size of DCI format 1_0; and a fourth condition that the size of a first DCI format is determined based on the size of one of the plurality of DCI formats. Meet any of the following conditions: Communication method.

7. An integrated circuit for controlling processing of a communication device, the processing comprising: receiving one or more signals; monitoring a plurality of downlink control information (DCI) formats in the one or more signals, including: Including, the plurality of DCI formats include DCI format 0_0, DCI format 1_0, a first DCI format used for scheduling a physical uplink shared channel (PUSCH), and a second DCI format used for scheduling a physical downlink shared channel (PDSCH); The first DCI format and the second DCI format are different from any of the following DCI formats: DCI format 0_0 DCI format 0_1 DCI format 1_0 DCI format 1_1 DCI format 2_0 DCI format 2_1 DCI format 2_2 The plurality of DCI formats to be monitored are a first condition that a first total number of different DCI sizes in the plurality of DCI formats is equal to or less than a predetermined first number; and a second condition that a second total number of different DCI sizes in the plurality of DCI formats identified by a cell-radio network temporary identifier (C-RNTI) is equal to or less than a predetermined second number; or a third condition that the size of DCI format 0_0 is the same as the size of DCI format 1_0; and a fourth condition that the size of a first DCI format is determined based on the size of one of the plurality of DCI formats. Meet any of the following conditions: Integrated circuit.

8. circuitry that, during operation, determines a plurality of downlink control information (DCI) formats, including: DCI format 0_0, DCI format 1_0, a first DCI format used for scheduling a physical uplink shared channel (PUSCH), and a second DCI format used for scheduling a physical downlink shared channel (PDSCH), The first DCI format and the second DCI format are different from any of the following DCI formats: DCI format 0_0 DCI format 0_1 DCI format 1_0 DCI format 1_1 DCI format 2_0 DCI format 2_1 DCI format 2_2 a transmitter that, during operation, transmits the plurality of DCI formats by one or more signals; Equipped with The plurality of DCI formats to be monitored are a first condition that a first total number of different DCI sizes in the plurality of DCI formats is equal to or less than a predetermined first number; and a second condition that a second total number of different DCI sizes in the plurality of DCI formats identified by a cell-radio network temporary identifier (C-RNTI) is equal to or less than a predetermined second number; or a third condition that the size of DCI format 0_0 is the same as the size of DCI format 1_0; and a fourth condition that the size of a first DCI format is determined based on the size of one of the plurality of DCI formats. Meet any of the following conditions: Base station.

9. receiving one or more signals; determining a plurality of downlink control information (DCI) formats, including: DCI format 0_0, DCI format 1_0, a first DCI format used for scheduling a physical uplink shared channel (PUSCH), and a second DCI format used for scheduling a physical downlink shared channel (PDSCH), The first DCI format and the second DCI format are different from any of the following DCI formats: DCI format 0_0 DCI format 0_1 DCI format 1_0 DCI format 1_1 DCI format 2_0 DCI format 2_1 DCI format 2_2 transmitting the plurality of DCI formats by the one or more signals; Including, The plurality of DCI formats to be monitored are a first condition that a first total number of different DCI sizes in the plurality of DCI formats is equal to or less than a predetermined first number; and a second condition that a second total number of different DCI sizes in the plurality of DCI formats identified by a cell-radio network temporary identifier (C-RNTI) is equal to or less than a predetermined second number; or a third condition that the size of DCI format 0_0 is the same as the size of DCI format 1_0; and a fourth condition that the size of a first DCI format is determined based on the size of one of the plurality of DCI formats. Meet any of the following conditions: Communication method.

10. An integrated circuit for controlling processing of a base station, the processing comprising: determining multiple downlink control information (DCI) formats, including: DCI format 0_0, DCI format 1_0, a first DCI format used for scheduling a physical uplink shared channel (PUSCH), and a second DCI format used for scheduling a physical downlink shared channel (PDSCH), The first DCI format and the second DCI format are different from any of the following DCI formats: DCI format 0_0 DCI format 0_1 DCI format 1_0 DCI format 1_1 DCI format 2_0 DCI format 2_1 DCI format 2_2 transmitting the plurality of DCI formats by one or more signals; The plurality of DCI formats to be monitored are a first condition that a first total number of different DCI sizes in the plurality of DCI formats is equal to or less than a predetermined first number; and a second condition that a second total number of different DCI sizes in the plurality of DCI formats identified by a cell-radio network temporary identifier (C-RNTI) is equal to or less than a predetermined second number. or a third condition that the size of DCI format 0_0 is the same as the size of DCI format 1_0; and a fourth condition that the size of a first DCI format is determined based on the size of one of the plurality of DCI formats. Meet any of the following conditions: Integrated circuit.

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