Communication equipment, communication methods, integrated circuits, and base stations

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 Art

[0002] A communication system called the 5th generation mobile communication system (5G) is being studied. For example, it is being considered to flexibly provide functions for each individual use case that requires an increase in communication traffic, an increase in the number of connected terminals, high reliability, and low latency.

[0003] As an example of typical services, there are three: enhanced Mobile Broadband (eMBB), massive Machine Type Communications (mMTC), and Ultra Reliable and Low Latency Communication (URLLC).

[0004] The 3GPP (Third Generation Partnership Project) (registered trademark), which is an international standardization organization, is studying the advancement of communication systems from both aspects of the advancement of the LTE (Long Term Evolution) system and New Radio (NR).

Prior Art Documents

Non-Patent Documents

[0005]

Non-Patent Document 1

Non-Patent Document 2

[0006] In order for terminals to properly detect control information transmitted from base stations, there is room for consideration regarding the size adjustment of control information, which is provided in multiple formats.

[0007] Non-limiting embodiments of this disclosure contribute to providing improved base stations, terminals, and communication methods that enable terminals to properly detect control information.

[0008] A base station according to one aspect of the present disclosure includes a control circuit that sequentially performs 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 or second format. The system includes a transmitting circuit for transmitting the aforementioned control information.

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

[0010] A communication method for a base station according to one aspect of the present disclosure involves 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 or second format, and then transmitting the control information.

[0011] A communication method for a terminal according to one aspect of the present disclosure controls the reception of control information based on information relating to 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 or second format, and receives the control information in accordance with the control.

[0012] These comprehensive or specific embodiments may be implemented as systems, devices, methods, integrated circuits, computer programs, or recording media, or as any combination of systems, devices, methods, integrated circuits, computer programs, and recording media.

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

[0014] Further advantages and effects of one aspect of this disclosure will be made apparent from the specification and drawings. Such advantages and / or effects are provided by several embodiments and features described in the specification and drawings, but not all of them are necessarily provided in order to obtain one or more identical features. [Brief explanation of the drawing]

[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 a base station configuration. [Figure 5] Block diagram showing an example of terminal configuration [Figure 6] Block diagram showing an example of a base station configuration. [Figure 7] Block diagram showing an example of terminal configuration [Figure 8]Flowchart showing an operation example according to Embodiment 2 [Figure 9] Flowchart showing another operation example according to Embodiment 2 [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 the DCI (Downlink control information) format

Mode for Carrying Out the Invention

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

[0017] Note that the attached drawings and the following description are provided for 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, as a PDCCH region, which is one of the control channels for transmitting DCI (downlink control information), a control resource set (CORESET) and a search space are set for a terminal (for example, a UE (User Equipment)). The UE monitors the search space, which is the position of PDCCH (physical downlink control channel) candidates in the CORESET, and detects DCI. Eight types of DCI formats are prepared as follows (for example, 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." Furthermore, in the following notations such as "DCI format 0_0 / 1_0" and "DCI format 0_1 / 1_1," the " / " means "and / or."

[0021] The DCI format 0_0 / 1_0 may have different sizes depending on whether it is used for CSS (common search space) or USS (UE specific search space). Furthermore, DCI format 2_2 and DCI format 2_2 are defined to have the same size as DCI format 0_0 / 1_0 for CSS. Note that one of CSS or USS may correspond to an example of the first search space, and the other of CSS or USS may correspond to an example of the second search space.

[0022] The UE monitors the DCI format configured to be monitored by the base station (e.g., gNB). The base station can also monitor different DCI formats for each UE. Non-patent document 2 specifies that the UE does not need to monitor more than four different sized DCI formats. Furthermore, with respect to DCI formats masked (or scrambled) by C-RNTI (cell-radio network temporary identifier), the UE does not need to monitor more than three different sized DCI formats. Therefore, the base station configures the DCI format according to these specifications.

[0023] URLLC requires extremely high reliability and low latency, thus necessitating a reduction in the error rate of the PDSCH, 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, an example of a control channel. The UE can correctly recognize the PDSCH assignment by correctly detecting the PDCCH, thereby reducing the PDSCH error rate.

[0024] One method for reducing the error rate of PDCCH is to reduce the size of the DCI transmitted in PDCCH by about 10 to 16 bits compared to the DCI format 0_0 / 1_0 (for example, Non-Patent Document 1). On the other hand, it is also possible to make the fields included in the DCI variable by configuring the upper layer, and to make the size larger than the DCI format 0_0 / 1_0.

[0025] If the base station sets a DCI format of a different size than the 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] The embodiment described below illustrates how proper DCI detection can be achieved in the UE when the base station sets a DCI format of a different size than the existing DCI format.

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

[0028] With a two-stage processing method, if the total number of different DCI format sizes is less than the threshold in the first stage of processing, the second stage can be skipped (or bypassed). By skipping the second stage, the DCI size can be kept or 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. Thus, 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 size of the DCI format when the new DCI format is not considered) In DCI format 0_0 / 1_0, the number of bits used for frequency domain resource assignment can vary depending on the expected bandwidth (e.g., bandwidth part, BWP). Therefore, the size of DCI format 0_0 / 1_0 is determined by the BWP value. In addition, in DCI format 0_1 / 1_1, there are fields with a variable number of bits, in addition to the frequency domain resource assignment bits, due to signaling from higher layers. Therefore, the size of the DCI format is also variable due to signaling from higher layers.

[0031] If the new DCI format is not considered, one example of a method for determining the size of the DCI format is the method illustrated in the flowchart in Figure 12. Figure 12 illustrates five steps (Steps 0-4).

[0032] Step 0 determines the sizes of the CSS DCI format 0_0 and DCI format 1_0. For example, the size of DCI format 0_0 is determined based on the value of the initial UL BWP (Band width part). "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 initial DL BWP value. If the sizes of DCI format 0_0 and DCI format 1_0 are different, for example, the size of DCI format 0_0 will be adjusted to match (or aligned with) 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 frequency-direction resource allocation bits are removed from DCI format 0_0.

[0035] Note that "adding" bit 0 may be rephrased as "padding," "insert," or "prepend." "Deleting" a bit may be rephrased as "truncation" or "drop."

[0036] Step 1 determines the sizes of the USS DCI format 0_0 and DCI format 1_0. For example, the size of DCI format 0_0 is determined based on the value of the active UL BWP. The size of DCI format 1_0 is determined based on the value of the active DL BWP. If the sizes of DCI format 0_0 and DCI format 1_0 are different, bit 0 is added to the smaller DCI format to make it match the larger DCI format.

[0037] In Step 2, the sizes of the USS DCI format 0_1 ​​and DCI format 1_1 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 different size from the size of USS's DCI format 0_0. 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 different size from the size of USS's DCI format 1_0.

[0038] Step 3 verifies the following two conditions. If both conditions are met, the process can be terminated. 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 formats monitored using C-RNTI is not greater than X2. Note that X1 and X2 are both integers greater than or equal to 1, and in Non-Patent Document 2, X1=4 and X2=3.

[0039] Step 4 involves resizing the CSS DCI format 0_0 / 1_0 to match the USS DCI format 0_0 / 1_0. For example, the CSS DCI format 0_0 / 1_0 is resized to match (aligned) the USS DCI format 0_0 / 1_0. The USS DCI format 0_0 / 1_0 is assumed to be BWP, similar to the CSS.

[0040] (Example of operation 1-1) Next, we will explain the operation example 1-1 according to Embodiment 1 with reference to the flowchart in Figure 1.

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

[0042] Procedure A (Step 5) corresponds to the process of determining whether or not to make the size of the new DCI format the same as other DCI formats. Procedure B (Step 6) corresponds to the process of making the size of the new DCI format the same as other DCI format(s) (hereinafter sometimes referred to as the "size adjustment process"), depending on the decision made in Procedure A (Step 5) to "make the size the same". An example of "other DCI format(s)" will be described later. In operation example 1-1, the new DCI format is, for illustrative purposes, masked (scrambled) by an RNTI different from 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 receives monitoring instructions from a base station (e.g., gNB) at a higher layer. The New DCI format is expected to be monitored in either the USS or CSS search space, or both. The UE may be instructed, for example, by higher-layer signaling, to monitor the New DCI format in either the USS or CSS search space.

[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, cases where monitoring of both of the two control signals is instructed and cases where monitoring of only one of the two control signals is instructed are assumed. Note that "control signal" may be read as "control information".

[0045] Also, the size of the New DCI format may be different depending on a field set by a higher 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," and "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 UL BWP and DL BWP settings. If the BWP differs between CSS and USS, the size of the New DCI format may also differ between CSS and USS.

[0049] After Step 2.1, Step 3 is executed. If Step 3 is determined to be NO, Step 4 is executed, followed by Step 5 (Procedure A). In Step 5 (Procedure A), for example, condition A, "The total number of different DCI format sizes is not greater than X1," is checked.

[0050] In example 1-1, it is assumed that the new DCI format is masked by an RNTI different from C-RNTI. Therefore, in Step 5 (Procedure A), the decision condition B regarding X2 in Step 3 (the total number of sizes of different DCI formats monitored using C-RNTI is not greater than X2) does not need to be included. If the new DCI format is masked by C-RNTI, the decision 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 met (Step 5; YES), the process in Example 1-1 may be terminated. On the other hand, if it is determined that condition A is not met (Step 5; NO), the process proceeds to Step 6 (Procedure B).

[0052] In Step 6 (Procedure B), the size of the new DCI format is made consistent with the sizes of the other DCI format(s). For example, the size of the new DCI format is made consistent 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

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

[0054] Furthermore, in Procedure B, the statement that the size of the new DCI format is aligned with the size of other DCI format(s) can also be interpreted as the size of other DCI format(s) being aligned with the size of the new DCI format.

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

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

[0057] Therefore, if the second decision process (Step 5) determines 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 smaller DCI size (which may be conveniently called "Compact DCI") is set for the new DCI format for URLLC than the sizes of other DCI formats, the new DCI format can be operated at its smaller size. Thus, the reception quality of the new DCI format at the UE can be maintained. In other words, the degradation of the reception quality of the new DCI format at the UE caused by adjusting the size of the new DCI format can be suppressed or prevented.

[0059] (Example 1-2) Next, we will explain the operation example 1-2 according to Embodiment 1 with reference to the flowchart in Figure 2.

[0060] In Operation Example 1-2, unlike Operation Example 1-1, the decision process (Step 2.2; Procedure A) and the 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 the process of deciding whether or not to make the size of the new DCI format the same as other DCI formats, and Step 2.3 (Procedure B) corresponds to the process of making the size of the new DCI format the same as other DCI formats. Note that in Figure 2, Step 2.1 is the same as Step 2.1 in Operation Example 1-1 in Figure 1.

[0062] In Operation Example 1-2, as in Operation Example 1-1, we assume that the new DCI format is masked (scrambled) by an RNTI different from C-RNTI. Below, we will describe an operation example that focuses on processing different from Operation Example 1-1 (Steps 2.2 and 2.3).

[0063] Step 2.2 (Procedure A) verifies, for example, that 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 in Operation Example 1-1, it is assumed that the new DCI format is masked by an RNTI different from C-RNTI, so in Step 2.2 (Procedure A), the decision condition B regarding X2 (the total number of sizes of different DCI formats monitored using C-RNTI is not greater than X2) does not need to be included. If the new DCI format is masked by C-RNTI, the decision 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 met (Step 2.2; YES), the process in Example 1-2 may be terminated. On the other hand, if it is determined that condition A is not met (Step 2.2; NO), the process proceeds to Step 2.3 (Procedure B).

[0066] In Step 2.3 (Procedure B), the size of the new DCI format is made consistent with the sizes of the other DCI format(s), similar to Step 6 in Figure 1. For example, the size of the new DCI format is made consistent 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 Operation Example 1-2, Steps 3 and 4, as illustrated in Figure 1, are executed after Step 2.3 (Procedure B).

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

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

[0070] Therefore, if in Step 2.2 (Procedure A) it is determined 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 match. Therefore, for example, if the BWP in USS is larger than the BWP in CSS, the BWP that can be specified in the USS DCI format 0_0 / 1_0 can be a separate BWP in USS, without having to match the BWP in CSS. Thus, for example, flexible resource allocation is possible in the USS DCI format 0_0 / 1_0.

[0072] (Examples of operation 1-3) Next, we will describe Operation Example 1-3 according to Embodiment 1 with reference to the flowchart in Figure 3. Operation Example 1-3 can be considered as a modified example that combines the elements of Operation Example 1-1 and Operation Example 1-2 described above.

[0073] For example, as shown in Figure 3, in Operation Example 1-3, Step 2.1.1 is executed before Step 2.2 of Operation Example 1-2 (for example, between Step 2.1 and Step 2.2). In Step 2.1.1, it is determined (or confirmed) whether condition B, "The total number of different DCI format sizes monitored using C-RNTI is not greater than X2," is met. This condition B corresponds to some of the conditions in Step 3 of Operation Example 1-2. Therefore, in Operation Example 1-3, in Step 3.1, condition A is confirmed out of conditions A and B.

[0074] If it is determined in Step 2.1.1 that condition B is met (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 met (Step 2.1.1; NO), the process proceeds to Step 4.1. Step 4.1 is equivalent to Step 4 in Operation Example 1-1 and Operation Example 1-2.

[0075] In Step 2.2 (Procedure A), if it is determined that condition A is met (Step 2.2; YES), the process in Example 1-3 may be terminated. On the other hand, if it is determined that condition A is not met (Step 2.2; NO), the process proceeds to Step 2.3 (Procedure B).

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

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

[0078] In Steps 4 and 4.1, similar to examples 1-1 and 1-2, the sizes of the DCI format 0_0 / 1_0 for CSS and the DCI format 0_0 / 1_0 for USS are made consistent.

[0079] After Step 4, the processing of Operation Example 1-3 may be terminated. On the other hand, 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 met (Step 5; YES), the process in Example 1-3 may be terminated. On the other hand, if it is determined that condition A is not met (Step 5; NO), the process proceeds to Step 6 (Procedure B).

[0081] In Step 6 (Procedure B), the size of the new DCI format is made consistent with the sizes of the other DCI format(s). After Step 6 (Procedure B), the processing in Example 1-3 can be terminated.

[0082] The above explains 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, so regardless of the total number of different DCI format sizes monitored using C-RNTI, the size of the new DCI format is adjusted if 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) is met, namely, "The total number of different DCI formats monitored using C-RNTI is not greater than X2."

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

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

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

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

[0088] In the base station 100 shown in Figure 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 a DCI addressed to the terminal 200.

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

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

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

[0092] (Configuration of base station 100) The base station 100 shown in Figure 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 can be considered as an example of the control unit 112 shown in Figure 4. The base station 100 shown in Figure 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, modulation unit 105, signal allocation unit 106, and transmission unit 107 can be considered as an example of a transmission processing unit that performs DL transmission processing. The reception unit 108, signal separation unit 109, demodulation unit 110, and error correction decoding unit 111 can be considered as an example of a reception processing unit that performs UL reception processing.

[0094] The DCI format determination unit 101 determines, for example, the DCI format that the base station 100 will use for the terminal 200 for each cell (e.g., SpCell and SCell). "SpCell" is an abbreviation for "special cell," and "SCell" is an abbreviation for "secondary cell." "SpCell" is, for example, a primary cell (PCell) or a primary secondary cell (PSCell).

[0095] The DCI format information determined for each cell by the DCI format determination unit 101 is output to, for example, the error correction coding unit 104 and the DCI format size adjustment unit 102. The DCI format information output to the error correction coding unit 104 can be considered as an example of information notified to the terminal 200 by signaling at a higher layer.

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

[0097] The DCI format size adjustment unit 102 determines whether or not 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. The DCI format information after size adjustment is output to, for example, the DCI generation unit 103.

[0098] The DCI generation unit 103 generates, for example, a DCI control signal for assigning DL data and a DCI control signal for assigning UL data, based on the DCI format information input from the DCI format size adjustment unit 102.

[0099] The generated DCI is output to the signal assignment unit 106 as an example of transmission data. For example, a DCI that assigns DL data is output to the signal assignment unit 106. A DCI that assigns UL data is output to the signal separation unit 109 in addition to the signal assignment unit 106 as an example of a control signal indicating the position where the UL data is assigned.

[0100] The error correction coding unit 104 takes, for example, the transmitted data signal (DL data signal) and the signaling from the upper layer as input, performs error correction coding on the input signals, and outputs them to the modulation unit 105.

[0101] The modulation unit 105, for example, applies modulation processing to the signal input from the error correction coding unit 104 and outputs the modulated data signal to the signal assignment unit 106.

[0102] The signal assignment unit 106 assigns, for example, the DL data signal and the DCI, which is an example of a control signal input from the DCI generation unit 103, to wireless resources to form a transmission signal. The formed transmission signal is output to the transmission unit 107.

[0103] The transmitting unit 107 generates a wireless signal by performing wireless transmission processing such as upconversion and amplification on the input signal from the signal assignment unit 106, and transmits the wireless signal from the antenna.

[0104] The receiving unit 108, for example, receives the UL wireless signal transmitted from the terminal 200 using its antenna, performs wireless reception processing such as amplification and down-conversion on the received wireless signal, and outputs it to the signal separation unit 109.

[0105] The signal separation unit 109 separates (or extracts) the received signals (e.g., UL data signals) that are allocated to UL's radio resources, based on UL's resource allocation information input from the DCI generation unit 103. The separated UL data signals are output to the demodulation unit 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] The error correction decoding unit 111, for example, decodes the input signal from the demodulation unit 110 and outputs the UL received data signal from the terminal 200.

[0108] (Configuration of terminal 200) The terminal 200 shown in Figure 7 includes, for example, a receiving unit 201, a signal separation unit 202, a DCI receiving unit 203, a demodulation unit 204, and an error correction decoding unit 205. The terminal 200 also includes, for example, a DCI format setting receiving unit 206, a DCI format size adjustment unit 207, an error correction encoding unit 208, a modulation unit 209, a signal assignment unit 210, and a transmission unit 211.

[0109] The receiving unit 201, signal separation unit 202, DCI receiving unit 203, demodulation unit 204, and error correction decoding unit 205 can be considered as an example of a receiving processing unit that performs DL receiving processing. The DCI format setting receiving unit 206 and DCI format size adjustment unit 207 can be considered as an example of a control unit 212 illustrated in Figure 5. The error correction coding unit 208, modulation unit 209, signal assignment unit 210, and transmission unit 211 can be considered as an example of a transmission processing unit that performs UL transmission processing.

[0110] The receiving unit 201, for example, receives the DL receiving signal with an antenna, performs wireless reception processing such as amplification and down-conversion on the received signal, and then outputs the received signal to the signal separation unit 202.

[0111] The signal separation unit 202 separates the signals assigned to PDCCH candidate positions in the received signal input from the receiving unit 201, for example, and outputs them to the DCI receiving unit 203. The signal separation unit 202 also separates the DL data signals from the received signal based on DL resource allocation information input from the DCI receiving unit 203, for example, and outputs them to the demodulation unit 204.

[0112] The DCI receiver 203 detects the DCI at the output of the signal separation unit 202 based on information about the DCI format (e.g., type and / or size) input from, for example, the DCI format size adjustment unit 207. The DCI receiver 203 also decodes and receives the detected DCI.

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

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

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

[0116] The DCI format setting receiving unit 206 sets the DCI format to be used for each cell based on, for example, the signaling from the upper layer input from the error correction decoding unit 205, and outputs the setting information to the DCI format size adjustment unit 207.

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

[0118] Furthermore, after determining the DCI format to be monitored, the DCI format size adjustment unit 207 determines whether or not to adjust the size of the DCI format, as shown in, for example, Operation Example 1-1, Operation Example 1-2, or Operation Example 1-3, and adjusts the size of the DCI format according to the result of the determination. The information of the DCI format after size adjustment is output to the DCI receiving unit 203.

[0119] The error correction coding unit 208, for example, takes the UL's transmitted data signal as input, performs error correction coding on the input transmitted data signal, and outputs it to the modulation unit 209.

[0120] The modulation unit 209 modulates the signal input from the error correction coding unit 208 and outputs the modulated signal to the signal assignment unit 210.

[0121] The signal assignment unit 210 identifies the radio resources to be assigned to the UL data signal based on the UL resource allocation information, which is input from the DCI receiver unit 203, and assigns the UL data signal to the identified radio resources.

[0122] The transmitting unit 211 generates a wireless signal by performing wireless transmission processing such as upconversion and amplification on the input signal from the signal assignment unit 210, and transmits the wireless signal from the antenna.

[0123] (Supplementary information for Embodiment 1) The choice of which of the aforementioned operation examples 1-1, 1-2, and 1-3 to be used (or applied) at the base station 100 and terminal 200 may be predetermined, or it may be selected based on the operational conditions. Alternatively, the choice of which of operation examples 1-1 to 1-3 to use may be determined by signaling at the upper layer.

[0124] Furthermore, in Embodiment 1, it was assumed that the new DCI format is masked by an RNTI different from C-RNTI, but it may also be masked by C-RNTI. In that case, information for distinguishing between the existing DCI format and the new DCI format (e.g., identification bits) may be added to one or both of the individual DCI formats. The identification bits allow for identification or distinction between the existing DCI format and the new DCI format, even if they have the same size.

[0125] Furthermore, if the new DCI format is masked by C-RNTI, "Procedure A" in Operation Example 1-1 and Operation Example 1-2 (Figure 2) may be the same judgment condition as in Step 3, with the addition of a limitation on the total number of different sizes related to 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 the settings of the upper layer, or they may be predetermined values.

[0127] Furthermore, in Embodiment 1, a DCI format extended for URLLC was assumed as an example of a new DCI format, but a DCI format extended for other purposes or applications may also qualify as a "new DCI format". Non-limiting examples of DCI formats extended for other purposes or applications include DCI formats for unlicensed bands, MTC (machine type communication), NB-IoT (narrow band-internet of things), V2X (vehicle-to-everything), and MIMO (multiple-input and multiple-output).

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

[0129] However, the same result can be obtained by replacing condition A and condition B with, for example, the following conditions A1 and B1. (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 formats to be monitored using C-RNTI is less than or equal to X2.

[0130] Alternatively, conditions A and B may be replaced with conditions A2 and B2 respectively, and if at least one of conditions A2 and B2 is met, the process proceeds to Step 4; if neither condition A2 nor B2 is met, the process proceeds 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 formats to be monitored using C-RNTI is greater than X2.

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

[0132] Alternatively, in "Procedure A," if condition A2, "The total number of different DCI format sizes is greater than X1," is met, the process may proceed in the direction of "Procedure B." If this condition is not met, the process may proceed in the other direction.

[0133] (Embodiment 2) Embodiment 2 describes an example of "Procedure B" in Embodiment 1. In Procedure B, the sizes of the new DCI format and other DCI format(s) are made equal. This satisfies condition A, which states that "the total number of different DCI format sizes is not greater than X1".

[0134] Furthermore, in Embodiment 2, it is assumed that the following relationship exists regarding the sizes of 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, if both a new DCI format for DL ​​grant and a new DCI format for UL grant are configured, the following settings (1) to (3) are assumed.

[0136] (1) The new DCI format for DL ​​grant and the new DCI format for UL grant should be the same size. This will reduce the size increase of different DCI formats that would otherwise occur due to the addition of the new DCI format.

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

[0138] (3) The new DCI format for DL ​​grants and the new DCI format for UL grants can be set to different sizes, and Procedure B is performed on either the DL grant or UL grant new DCI format. If condition A, "The total number of different DCI format sizes is not greater than X1", is met, Procedure B is skipped for the other new DCI format. If condition A, "The total number of different DCI format sizes is not greater than X1", is not met, Procedure B is performed for the other new DCI format. Whether Procedure B is performed (or applied) first to either the DL grant or UL grant new DCI format may be predetermined, or it may be specified that it is performed on the smaller size or the larger size. In this way, if condition A, "The total number of different DCI format sizes is not greater than X1", is met during the size adjustment of either new DCI format, the other new DCI format can maintain its set size.

[0139] Furthermore, it is possible that the system is configured to monitor both the new DCI format for USS and the new DCI format for CSS, and that their sizes may differ. In that case, the settings shown in (1) to (3) below are assumed, similar to the case where the sizes differ between DL assignment and UL grant.

[0140] (1) The new DCI format for CSS and the new DCI format for USS should be the same size. This will help to minimize the increase in size of different DCI formats that would otherwise be caused by the addition of the new DCI format.

[0141] (2) The new DCI format for CSS and the new DCI format for USS can be set to different sizes, but before processing Procedure B, they are adjusted to the same size. If the new DCI format for CSS and USS is adjusted to the same size before processing Procedure B, and condition A, "the total number of different DCI format sizes is not greater than X1", is met, 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 on 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 met, Procedure B is skipped for the other new DCI format. If condition A, "The total number of different DCI format sizes is not greater than X1", is not met, Procedure B is performed for the other new DCI format. Whether Procedure B is performed (or applied) first to either the new DCI format for CSS or the new DCI format for USS may be predetermined, or it may be specified that it be performed on the smaller size or the larger size new DCI format. In this way, if the condition A, "The total number of different DCI format sizes is not greater than X1", is met during the resizing of either new DCI format, the other new DCI format can maintain its set size.

[0143] Figure 8 shows an example of operation according to Embodiment 2 in a flowchart.

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

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

[0146] Procedure B-2 determines whether the size of the new DCI format is less than or equal to the size of the USS DCI format 0_1 / 1_1. If the size of the new DCI format is less than or equal to the size of the USS DCI format 0_1 / 1_1 (YES), the process proceeds to Procedure B-3. If the size is greater than the size of the USS DCI format 0_1 / 1_1 (NO), the process proceeds to B-4.

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

[0148] Procedure B-4 adjusts the size of DCI format 0_1 ​​or DCI format 1_1 to match the size of new DCI format. An example of this is explained in Operation Example 2-3 below.

[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 will be adjusted to match the smallest DCI format among the other DCI format(s) that is larger than the new DCI format. Therefore, the number of padding bits can be reduced.

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

[0151] Note that Procedure B-4 described above may be replaced by Procedure B-5 as illustrated in Figure 9. Procedure B-5: To make the size of the new DCI format the same as the sizes of other DCI format(s), some of the setting bits for the new DCI format are deleted. An example of this is explained in Operation Example 2-4 below.

[0152] (Example of operation 2-1) Example 2-1 describes an example of Procedure B-1 shown in Figures 8 and 9. Three non-limiting examples of Example 2-1 include Examples 2-1-1 to 2-1-3. Which of Examples 2-1-1 to 2-1-3 to apply may be predetermined or determined by signaling at the higher layer.

[0153] (Example of operation 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 Embodiment 1.

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

[0155] Figure 10 shows a flowchart of operation example 2-1-1. Procedure B-1-1 determines whether the size of the new DCI format is less than or equal to the size of the CSS DCI format_0_0 / 1_0. If the size of the new DCI format is less than or equal to 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 greater than the size of the CSS DCI format_0_0 / 1_0 (NO), the process proceeds to Procedure B-1-3.

[0156] Procedure B-1-2 adjusts the size of the new DCI format to be the same size as the CSS DCI format0_0 / 1_0 by adding bits to it. The added bits may be zero (zero padding) or other known bits (sequences). By adding zero or known bits (sequences), the UE can use the zero or known bits (sequences) for error detection when detecting the DCI. Therefore, the DCI reception error rate can be reduced.

[0157] Procedure B-1-3 adjusts the new DCI format to the same size as USS's DCI format0_0 / 1_0 by adding bits to it. The added bits may be zero (zero padding), as in Procedure B-1-2, or other known bits (sequences).

[0158] In example 2-1-1, the size of the new DCI format is adjusted to match the smaller DCI format, thus reducing the number of bits added to the new DCI format. Therefore, the reception quality of the new DCI format can be improved compared to other examples.

[0159] Furthermore, if USS and CSS overlap, the size of the new DCI format set in USS will be matched to the size of the DCI format in CSS, thereby reducing the number of blind detections (BDs) for DCI in UE. For example, even if the RNTIs are different, if the DCI formats are the same size, the number of DCI BDs may be counted as one. If USS and CSS do not overlap, the size of the new DCI format set in USS will be matched to the size of the DCI format in CSS, thereby reducing the total number of different DCI format sizes.

[0160] (Example of operation 2-1-2) Operation Example 2-1-2 is applicable to all Procedure B in Operation Examples 1-1, 1-2, and 1-3 of Embodiment 1. In Operation Example 2-1-2, Procedure B-1-3 shown in Figure 10 is applied independently. In Procedure B-1-3, even if the new DCI format is set in USS and a size smaller than the DCI format0_0 / 1_0 size of CSS is set, the size can be made to match the DCI format0_0 / 1_0 of USS. Therefore, when USS and CSS overlap each other, the number of BD detections by UE can be reduced.

[0161] (Example of operation 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 Embodiment 1.

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

[0163] Figure 11 shows a flowchart of operation example 2-1-3. Procedure B-1-1' determines whether the new DCI format is for CSS and whether the size of the CSS new DCI format is less than or equal to the size of the CSS DCI format_0_0 / 1_0. If the new DCI format is for CSS and the size of the CSS new DCI format is less than or equal to the size of the CSS DCI format_0_0 / 1_0 (YES), the process moves to Procedure B-1-2'. If the size of the CSS new DCI format is greater than the size of the CSS DCI format_0_0 / 1_0 (NO), the process moves to Procedure B-1-3. In other words, even if the new DCI format is for CSS, if its size is greater than the CSS DCI format0_0 / 1_0, the process moves to Procedure B-1-3, and if the new DCI format is for USS, the process moves to Procedure B-1-3 regardless of its size.

[0164] Procedure B-1-2' adjusts the new DCI format for CSS to the same size as DCI format0_0 / 1_0 for CSS by adding bits to it. The bits to be added 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 in operation examples 2-1-1 and 2-1-2. For example, in Procedure B-1-3, the new DCI format is adjusted to the same size as USS's DCI format0_0 / 1_0 by adding bits to the new DCI format. The bits to be added may be zero (zero padding), as in Procedure B-1-2, or other known bits (sequences).

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

[0167] In example 2-1-3, in Procedure B-1-1', the size of the new DCI format for CSS is compared to the size of the DCI format 0_0 / 1_0 for CSS. 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, the new DCI format for CSS is adjusted to the size of the DCI format 0_0 / 1_0 for USS. However, the new DCI format for CSS may be adjusted to the size of the 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 the DCI format 0_0 / 1_0 for CSS, the new DCI format for CSS may be made to the size of the DCI format 0_0 / 1_0 for CSS by removing specified bits, such as the frequency allocation bits of the new DCI format. This operation of removing bits is also called "truncation," as previously mentioned.

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

[0170] The bit deletion and DCI detection disabling method does not change the size of the CSS DCI format 0_0 / 1_0. Therefore, even during periods when the UE does not detect (or cannot read) the DCI format for USS due to, for example, a reconfiguration of a higher layer, the UE can continue communication using the CSS DCI format 0_0 / 1_0.

[0171] Note that in example 2-1, the relationship between 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 was assumed, but the size relationships of each DCI format are not limited to this assumption.

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

[0173] (Example of operation 2-2) Example 2-2 describes an example of Procedure B-3 shown in Figures 8 and 9. Five non-restrictive examples of Example 2-2 include Examples 2-2-1 to 2-2-5. Which of Examples 2-2-1 to 2-2-5 to apply may be predetermined or determined by signaling at the higher layer.

[0174] (Example of operation 2-2-1) In 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 format1_1 (for DL ​​assignment).

[0175] Therefore, size adjustments are performed for 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, then the new DCI formats for DL ​​assignment and UL grant will be the same size.

[0176] According to example 2-2-1, the new DCI format can be sized to match the smaller DCI format 0_1 ​​or DCI format 1_1, thus reducing the number of padding bits.

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

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

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

[0180] According to example 2-2-3, even if the UL BWP is changed, resizing may not be necessary if the new DCI format for UL grant is matched to the size of DCI format 1_1.

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

[0182] According to example 2-2-4, the sizes of the control signals for DL ​​and UL are matched. When the sizes of the control signals for DL ​​and UL are similar (for example, when the size difference is less than or equal to a threshold), the number of padding bits may be reduced.

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

[0184] According to example 2-2-5, even if the DL BWP is changed, resizing may not be necessary if the new DCI format for UL grant is matched to the size of DCI format 0_1.

[0185] (Example of operation 2-3) Example 2-3 describes an example of Procedure B-4 shown in Figure 8. Five non-restrictive examples of Example 2-3 include Examples 2-3-1 to 2-3-5. Which of Examples 2-3-1 to 2-3-5 to apply may be predetermined or determined by signaling at the higher layer.

[0186] (Example of operation 2-3-1) In 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 the two DCI formats.

[0187] Therefore, if size adjustments are performed on both DCI format 1_1 and DCI format 0_1, and the smaller of the new DCI formats is also smaller, then DCI format 1_1 and DCI format 0_1 ​​will have the same size.

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

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

[0190] According to example 2-3-2, the sizes of DL control signals are matched, and the sizes of UL control signals are matched, so even if the UL BWP is changed, the DL control signals can continue to be used without being affected by the size change. In other words, the UE can continue blind detection of DL control signals.

[0191] (Example of operation 2-3-3) In example 2-3-3, both DCI format 1_1 and DCI format 0_1 ​​are sized to match the new DCI format for DL ​​assignment. If the new DCI format for DL ​​assignment is not set, and 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 less than or equal to the size of the DCI format for UL grant, then DCI format 1_1 and DCI format 0_1 ​​may be sized to match the new DCI format for UL grant.

[0192] According to example 2-3-3, even if there are changes to the UL BWP, resizing may not be necessary if the size of DCI format 0_1 ​​is matched to the size of the DCI used for DL ​​assignment.

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

[0194] According to example 2-3-4, the sizes of the DL control signal and the UL control signal are matched. When the sizes of the DL control signal and the UL control signal are similar (for example, when the size difference is less than or equal to a threshold), the number of padding bits may be reduced.

[0195] (Example of operation 2-3-5) In example 2-3-3, both DCI format 1_1 and DCI format 0_1 ​​are sized to match the new DCI format for UL grant. If the new DCI format for UL grant is not set, and 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 less than or equal to the size of the DCI format for DL ​​assignment, then DCI format 1_1 and DCI format 0_1 ​​may be sized to match the new DCI format for DL ​​assignment.

[0196] According to example 2-3-5, even if there are changes to the DL BWP, resizing may not be necessary if the size of DCI format 0_1 ​​is matched to the size of the DCI used for UL grant.

[0197] (Example of operation 2-4) Example 2-4 describes an example of Procedure B-5 shown in Figure 9. Five non-restrictive examples of Example 2-4 include Examples 2-4-1 to 2-4-5. Which of Examples 2-4-1 to 2-4-5 to apply may be predetermined or determined by signaling at the higher layer.

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

[0199] An example of a bit designated for deletion is the bit used for frequency-direction resource allocation. According to Operation Example 2-4-1, the size of the new DCI format can be adjusted to match the size of the larger DCI format, thus reducing the number of bits to be deleted.

[0200] (Example of operation 2-4-2) In example 2-4-2, the new DCI format for DL ​​assignment is sized to match DCI format 1_1 (for DL ​​assignment), and the new DCI format for UL grant is sized to match DCI format 0_1 ​​(for UL grant). If DCI format 1_1 or DCI format 0_1 ​​is not set, the new DCI format may be sized to match the set 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 example 2-4-2, the sizes of DL control signals are matched, and the sizes of UL control signals are matched, so even if the UL BWP is changed, the DL control signals can continue to be used without being affected by the size change. In other words, the UE can continue blind detection of DL control signals.

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

[0203] According to example 2-4-3, even if there is a change in UL BWP, resizing may not be necessary if the new DCI format for UL grant is matched to the size of DCI format 1_1.

[0204] (Example of operation 2-4-4) In example 2-4-4, the new DCI format for DL ​​assignment is sized to match DCI format 0_1 ​​(for UL grant), and the new DCI format for UL grant is sized to match DCI format 1_1 (for DL ​​assignment). If DCI format 1_1 or DCI format 0_1 ​​is not set, the new DCI format may be sized to match the set 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 example 2-4-4, the sizes of the DL control signal and the UL control signal will be made the same. When the sizes of the DL control signal and the UL control signal are similar (for example, when the size difference is less than or equal to a threshold), the number of padding bits may be reduced.

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

[0207] According to example 2-4-5, even if there are changes to the DL BWP, resizing may not be necessary if the new DCI format for DL ​​assignment is matched to the size of DCI format 0_1.

[0208] (Example of operation 2-5) In example 2-5, the DCI format(s) with the closest size among those shown below 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 granting • 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, if the DCI format 0_0 / 1_0 of CSS and the DCI format 0_0 / 1_0 of USS are different, the sizes of the DCI format 0_0 / 1_0 of CSS and the DCI format 0_0 / 1_0 of USS may be distinguished, and those with similar sizes may be adjusted to the same size.

[0210] To match the size to CSS DCI format 0_0 / 1_0, remove bits from the other DCI format to match the size of CSS DCI format 0_0 / 1_0. For other combinations, add bits to the smaller DCI format to match the larger DCI format.

[0211] According to example 2-5, the number of padding bits used for resizing and the number of bits removed for resizing can be reduced.

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

[0213] If the New DCI format is larger than the size of the DCI format specified as being the same size, the following actions are possible for terminal 200: • Do not detect the new DCI format as an error case. • Truncation: Removes specified bits, such as frequency allocation bits, from the New DCI format to match the size of the specified DCI format. • Add bits to the DCI format specified as having the same size to match the size of the new DCI format.

[0214] (General supplementary information) If the new DCI format for DL ​​assignment and the new DCI format for UL grant are of the same size, a bit to distinguish between them (identification bit) may be added to one or both of the new DCI formats for DL ​​assignment and UL grant. Even if the new DCI format for DL ​​assignment and the new DCI format for UL grant are of different sizes, a bit to distinguish between them (identification bit) may be added to one or both of the new DCI formats for DL ​​assignment and UL grant in advance. If the identification bit is added in advance, even if size adjustment is not necessary, identification by the identification bit becomes possible, for example, in relation to a DCI format assigned later.

[0215] While the PDCCH signal was given as an example of a control signal, each of the embodiments described above may be applied to control signals with other names. For example, each of the embodiments described above may be applied to signals of control channels with other names such as EPDCCH (enhanced PDCCH), R-PDCCH (relay-PDCCH), and MPDCCH (MTC PDCCH).

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

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

[0218] The term "condition" may be replaced with other terms such as "criterion," "rule," "norm," or "method." Similarly, the term "judgment" may be replaced with other terms such as "decision," "verdict," "calculation," or "process."

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

[0220] Furthermore, the use of terms such as “first” and “second” as used in this disclosure (including the claims and abstract) is for convenience to distinguish 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, references to the first and second elements do not mean that only two elements may be adopted, nor do they mean that the first element must precede the second element.

[0221] This disclosure can be implemented in software, hardware, or software in conjunction with hardware. Each functional block used in the description of the above embodiments may be implemented in part or in whole as an integrated circuit (LSI), and each process described in the above embodiments may be controlled in part or in whole by a single LSI or a combination of LSIs. An LSI may consist of individual chips, or it may consist of a single chip that includes some or all of the functional blocks. An LSI may have data inputs and outputs. Depending on the degree of integration, LSIs may be referred to as ICs, system LSIs, super LSIs, or ultra LSIs.

[0222] Furthermore, the method of integration is not limited to LSIs, but may also be implemented using dedicated circuits, general-purpose processors, or dedicated processors. Alternatively, FPGAs (Field Programmable Gate Arrays) that can be programmed after LSI manufacturing, or reconfigurable processors that allow for the reconfiguration of the connections and settings of circuit cells within the LSI, may be used. This disclosure may also be implemented as digital or analog processing.

[0223] Furthermore, if advancements in semiconductor technology or related technologies lead to the emergence of integrated circuit technologies that replace LSIs, then naturally, these technologies can be used to integrate functional blocks. The application of biotechnology, for example, is a possible possibility.

[0224] This disclosure is applicable to all types of devices, systems, and equipment with communication capabilities (collectively referred to as communication devices). Non-exclusive examples of communication devices include telephones (mobile phones, smartphones, etc.), tablets, personal computers (PCs) (laptops, desktops, notebooks, etc.), cameras (digital still / video cameras, etc.), digital players (digital audio / video players, etc.), wearable devices (wearable cameras, smartwatches, tracking devices, etc.), game consoles, digital book readers, telehealth and telemedicine devices, vehicles or mobile transport with communication capabilities (automobiles, airplanes, ships, etc.), and combinations of the above-mentioned devices.

[0225] Communication devices are not limited to portable or movable devices, but also include all kinds of non-portable or fixed devices, devices, and systems, such as smart home devices (appliances, lighting equipment, smart meters or measuring instruments, control panels, etc.), vending machines, and any other "things" that may exist on an IoT (Internet of Things) network.

[0226] Communication includes data communication via cellular systems, wireless LAN systems, and communication satellite systems, as well as data communication using combinations of these.

[0227] Furthermore, the communication device also includes devices such as controllers and sensors that are connected to or linked to a communication device that performs the communication functions described in this disclosure. For example, this includes controllers and sensors that generate control signals and data signals used by the communication device that performs the communication functions of the communication device.

[0228] Furthermore, communication equipment includes infrastructure facilities such as base stations, access points, and any other devices, devices, and systems that communicate with or control the aforementioned non-limited types of equipment.

[0229] <Summary of this disclosure> The base station according to this disclosure includes a control circuit that sequentially performs 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 or second format, and a transmission circuit that transmits the control information.

[0230] In the base station relating to this disclosure, the control circuit may perform the first process before the second process.

[0231] Furthermore, in the base station relating to this disclosure, the control circuit may perform the second process before the first process.

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

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

[0234] Furthermore, in the base station relating to this disclosure, the control circuit may, in the second processing, adjust the control information to a size larger than the size of the third format, either the first or second format.

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

[0236] The terminal relating to this disclosure includes a control circuit that controls the reception of control information based on information relating to the application of a first process for aligning the size of control information between a first format and a second format, 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 a receiving circuit that receives the control information in accordance with the control.

[0237] The communication method for a base station according to this disclosure involves sequentially performing a first process to align 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 to align the size of the control information between a third format and the first or second format, and then transmitting the control information.

[0238] A communication method for a terminal according to this disclosure controls the reception of control information based on information relating to 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 or second format, and receives the control information in accordance with the control. [Industrial applicability]

[0239] This disclosure is particularly suitable for, for example, wireless communication systems. [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 Encoding Unit 105 Modulation section 106 Signal Assignment Unit 107 Transmitter 108 Receiving Unit 109 Signal separation section 110 Demodulation Unit 111 Error Correction and Decoding Unit 200 terminals 201 Receiving Unit 202 Signal separation section 203 DCI Receiver 204 Demodulation Unit 205 Error Correction and Decoding Unit 206 DCI format setting receiver 207 DCI format size adjustment section 208 Error Correction Encoding Unit 209 Modulation section 210 Signal assignment section 211 Transmitter

Claims

1. A receiving unit that receives one or more signals during operation, A circuit unit connected to the receiving unit, which, during operation, monitors a plurality of downlink control information (DCI) formats, including the following, in one or more of the signals: Equipped with, The aforementioned multiple DCI formats include DCI format 0_0, DCI format 1_0, a first DCI format used for scheduling physical uplink shared channels (PUSCH), and a second DCI format used for scheduling physical downlink shared channels (PDSCH). The first DCI format and the second DCI format described above are different from any of the following DCI formats: DCI template 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 is that the first total number of different DCI sizes in the plurality of DCI formats is less than or equal to a predetermined first number, and a second condition is that the second total number of different DCI sizes in the plurality of DCI formats identified by the cell-radio network temporary identifier (C-RNTI) is less than or equal to a predetermined second number. or A third condition is that the size of DCI format 0_0 matches the size of DCI format 1_0, and a fourth condition is that the size of the first DCI format is determined based on the size of any of the multiple DCI formats. Satisfying any of the following conditions Communication device.

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 DCI format 1_0 are monitored in the 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 USS but not in the 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. A process of receiving one or more signals, The process of monitoring one or more of the aforementioned signals, including multiple downlink control information (DCI) formats, Includes, The aforementioned multiple DCI formats include DCI format 0_0, DCI format 1_0, a first DCI format used for scheduling physical uplink shared channels (PUSCH), and a second DCI format used for scheduling physical downlink shared channels (PDSCH). The first DCI format and the second DCI format described above are different from any of the following DCI formats: DCI template 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 multiple DCI formats that are monitored are: A first condition is that the first total number of different DCI sizes in the plurality of DCI formats is less than or equal to a predetermined first number, and a second condition is that the second total number of different DCI sizes in the plurality of DCI formats identified by the cell-radio network temporary identifier (C-RNTI) is less than or equal to a predetermined second number. or A third condition is that the size of DCI format 0_0 matches the size of DCI format 1_0, and a fourth condition is that the size of the first DCI format is determined based on the size of any of the multiple DCI formats. Satisfying any of the following conditions Communication method.

7. An integrated circuit that controls the processing of a communication device, wherein the processing is A process for receiving one or more signals, The process involves monitoring one or more of the aforementioned signals, including multiple downlink control information (DCI) formats, which include the following: Includes, The aforementioned multiple DCI formats include DCI format 0_0, DCI format 1_0, a first DCI format used for scheduling physical uplink shared channels (PUSCH), and a second DCI format used for scheduling physical downlink shared channels (PDSCH). The first DCI format and the second DCI format described above are different from any of the following DCI formats: DCI template 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 multiple DCI formats that are monitored are: A first condition is that the first total number of different DCI sizes in the plurality of DCI formats is less than or equal to a predetermined first number, and a second condition is that the second total number of different DCI sizes in the plurality of DCI formats identified by the cell-radio network temporary identifier (C-RNTI) is less than or equal to a predetermined second number. or A third condition is that the size of DCI format 0_0 matches the size of DCI format 1_0, and a fourth condition is that the size of the first DCI format is determined based on the size of any of the multiple DCI formats. Satisfying any of the following conditions Integrated circuit.

8. During operation, a circuit section determines multiple downlink control information (DCI) formats, including the following: It includes DCI format 0_0, DCI format 1_0, a first DCI format used for scheduling physical uplink shared channels (PUSCH), and a second DCI format used for scheduling physical downlink shared channels (PDSCH). The first DCI format and the second DCI format described above are different from any of the following DCI formats: DCI template 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 During operation, the system includes a transmitting unit that transmits the multiple DCI formats using one or more signals, Equipped with, The multiple DCI formats that are monitored are: A first condition is that the first total number of different DCI sizes in the plurality of DCI formats is less than or equal to a predetermined first number, and a second condition is that the second total number of different DCI sizes in the plurality of DCI formats identified by the cell-radio network temporary identifier (C-RNTI) is less than or equal to a predetermined second number. or A third condition is that the size of DCI format 0_0 matches the size of DCI format 1_0, and a fourth condition is that the size of the first DCI format is determined based on the size of any of the multiple DCI formats. Satisfying any of the following conditions Base station.

9. A process of receiving one or more signals, The process of determining multiple downlink control information (DCI) formats, including the following: It includes DCI format 0_0, DCI format 1_0, a first DCI format used for scheduling physical uplink shared channels (PUSCH), and a second DCI format used for scheduling physical downlink shared channels (PDSCH). The first DCI format and the second DCI format described above are different from any of the following DCI formats: DCI template 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 process of transmitting the multiple DCI formats using one or more signals, Includes, The multiple DCI formats that are monitored are: A first condition is that the first total number of different DCI sizes in the plurality of DCI formats is less than or equal to a predetermined first number, and a second condition is that the second total number of different DCI sizes in the plurality of DCI formats identified by the cell-radio network temporary identifier (C-RNTI) is less than or equal to a predetermined second number. or A third condition is that the size of DCI format 0_0 matches the size of DCI format 1_0, and a fourth condition is that the size of the first DCI format is determined based on the size of any of the multiple DCI formats. Satisfying any of the following conditions Communication method.

10. An integrated circuit that controls the processing of a base station, wherein the processing is The process of determining multiple downlink control information (DCI) formats, including the following, It includes DCI format 0_0, DCI format 1_0, a first DCI format used for scheduling physical uplink shared channels (PUSCH), and a second DCI format used for scheduling physical downlink shared channels (PDSCH). The first DCI format and the second DCI format described above are different from any of the following DCI formats: DCI template 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 process includes transmitting the aforementioned multiple DCI formats using one or more signals, The multiple DCI formats that are monitored are: A first condition is that the total number of different DCI sizes in the plurality of DCI formats is less than or equal to a predetermined first number, and a second condition is that the total number of different DCI sizes in the plurality of DCI formats identified by a cell-radio network temporary identifier (C-RNTI) is less than or equal to a predetermined second number. or A third condition is that the size of DCI format 0_0 matches the size of DCI format 1_0, and a fourth condition is that the size of the first DCI format is determined based on the size of any of the multiple DCI formats. Satisfying any of the following conditions Integrated circuit.

Images