Terminal, base station, and wireless communication system

Abstract

This terminal comprises a reception unit and a control unit. The reception unit receives, from the base station, a first signal including first information pertaining to the number of repeated transmissions of a second signal. The control unit configures a plurality of CORESETs corresponding to the number of repeated transmissions of the second signal in accordance with first information included in the received first signal and pertaining to the number of repeated transmissions of the second signal. In addition, the control unit performs control so as to monitor the second signal that is repeatedly transmitted in each of the plurality of configured CORESETs.

Description

Terminals, base stations, and wireless communication systems

[0001] This invention relates to a terminal, a base station, and a wireless communication system.

[0002] Currently, mobile device traffic (smartphones and feature phones) accounts for the majority of network resources. Furthermore, the amount of traffic used by mobile devices is expected to continue to increase.

[0003] Furthermore, in addition to traffic used by mobile devices, IoT (Internet of Things) services (e.g., traffic systems, smart meters, monitoring systems for devices, etc.) are also being deployed. Therefore, networks are required to support services with diverse requirements. To support such diverse services, for example, the communication standards for fifth-generation mobile communications (5G or NR (New Radio)) (e.g., Non-Patent Documents 1-14) have been formulated with support for many use cases classified as eMBB (Enhanced Mobile Broadband), Massive MTC (Machine Type Communications), and URLLC (Ultra-Reliable and Low Latency Communications) in mind.

[0004] In 3GPP (3rd Generation Partnership Project®), technologies are being considered to enable communication even in areas such as mountainous regions and at sea by applying NR to non-terrestrial networks (NTN: Non-Terrestrial Networks) (for example, Non-Patent Document 15).

[0005] Furthermore, in 3GPP, for example, repeat transmission is being considered in NTN's downlink communication (Non-Patent Document 16). Non-Patent Document 16 specifically examines the repeat transmission of the PDCCH (Physical Downlink Control Channel).

[0006] 3GPP TS 37.324 V18.0.03GPP TS 37.340 V18.2.03GPP TS 38.201 V18.0.03GPP TS 38.202 V18.3.03GPP TS 38.211 V18.3.03GPP TS 38.212 V18.3.03GPP TS 38.213 V18.3.03GPP TS 38.214 V18.3.03GPP TS 38.215 V18.3.03GPP TS 38.300 V18.2.03GPP TS 38.321 V18.2.03GPP TS 38.322 V18.1.03GPP TS 38.323 V18.2.03GPP TS 38.331 V18.2.03GPP TR 38.821 V16.2.0R1-2407768

[0007] The terminal receives PDCCH via the search space within the configured CORESET (Control Resource Set). CORESET is the resource for receiving PDCCH. The search space, for example, indicates the resources within CORESET that the terminal monitors.

[0008] However, when PDCCH is transmitted repeatedly, the resource to which the repeatedly transmitted PDCCH is mapped is not determined. For example, even if we assume that the search space for the initial transmission of a PDCCH is the same as the search space for a non-repeated transmission, the search space for the second and subsequent transmissions of the PDCCH remains unknown. Therefore, for example, the benefits of repeated transmission of a PDCCH (e.g., expanded coverage) cannot be obtained. The same can be considered for signals similar to PDCCH.

[0009] The disclosed technology, made in view of the above, provides a method for determining the position of a repeatedly transmitted signal when the signal is repeatedly transmitted.

[0010] In one aspect, the present invention provides a terminal having a receiving unit that receives a first signal from a base station containing first information regarding the number of times a second signal is repeatedly transmitted, and a control unit that sets up a plurality of CORESETs corresponding to the number of times the second signal is repeatedly transmitted according to the first information, and controls each of the plurality of CORESETs to monitor the repeatedly transmitted second signal.

[0011] Furthermore, in one aspect, the present invention provides a base station having a transmitting unit that transmits a first signal to a terminal, which includes first information relating to the number of times a second signal is repeatedly transmitted, and a control unit that, in accordance with the first information, controls each of a plurality of CORESETs corresponding to the number of times a second signal is repeatedly transmitted to transmit the second signal.

[0012] When a signal is repeatedly transmitted, it becomes possible to determine the location of the repeatedly transmitted signal.

[0013] Figure 1 is a diagram showing an example of a wireless communication system according to Embodiment 1. Figure 2 is a diagram showing an example of a functional configuration block diagram of a base station in the wireless communication system according to Embodiment 1. Figure 3 is a diagram showing an example of a functional configuration block diagram of a terminal in the wireless communication system according to Embodiment 1. Figure 4 is a diagram showing an example of a sequence of the wireless communication system in Embodiment 1. Figure 5 is a diagram showing an example of resource arrangement in Embodiment 1. Figure 6 is a diagram showing an example of resource arrangement in Embodiment 2. Figure 7 is a diagram showing an example of resource arrangement in Embodiment 3. Figure 8 is a diagram showing an example of resource arrangement in Embodiment 3. Figure 9 is a diagram showing an example of a functional configuration block diagram of a base station in Embodiment 4. Figure 10 is a diagram showing an example of the hardware configuration of a base station. Figure 11 is a diagram showing an example of the hardware configuration of a terminal.

[0014] Hereinafter, this embodiment will be described in detail with reference to the drawings. The problems and embodiments described herein are examples only and do not limit the scope of the rights of this application. In particular, even if the wording of the description is different, if it is technically equivalent, the technology of this application can be applied even with different wording and does not limit the scope of the rights. Furthermore, each embodiment can be appropriately combined as long as the processing content is not contradictory.

[0015] Furthermore, the terminology and technical content used in this specification may be appropriately adapted from the terminology and technical content described in specifications and contributions of communication standards such as 3GPP. Examples of such specifications are those described in Non-Patent Documents 1 to 15.

[0016] The following describes in detail, with reference to the drawings, embodiments of the base station, terminal, and wireless communication system disclosed in this application. The following embodiments are not intended to limit the disclosed technology. Embodiment 1

[0017] Figure 1 shows an example of a wireless communication system 1 in Embodiment 1. The wireless communication system 1 includes a base station 100 and terminals 200A and 200B. The base station 100 forms a cell C10. Terminals 200A and 200B are located within cell C10. When terminals 200A and 200B are not distinguished, they are simply referred to as terminal 200.

[0018] Furthermore, the base station 100 may be a small wireless base station (including micro wireless base stations, femto wireless base stations, etc.) such as a macro wireless base station or pico wireless base station, or a wireless base station of various sizes, and may be described as a wireless communication device, communication device, transmitting device, etc. Also, the terminal 200 may be a wireless terminal such as a mobile phone, smartphone, PDA (Personal Digital Assistant), personal computer, vehicle, airplane, drone, or other devices with wireless communication capabilities, or a device (sensor device, etc.) mounted on a robot, AV equipment, home appliances, office equipment, vending machine, other household equipment, industrial equipment, etc., and may be described as a wireless communication device, communication device, receiving device, mobile station, etc.

[0019] Base station 100 is connected to the network via wired connections with network devices (higher-level devices and other base stations) not shown in the diagram. Alternatively, base station 100 may be connected to the network devices wirelessly instead of via wired connections.

[0020] The base station 100 may separate its wireless communication function with the terminal 200 from its digital signal processing and control functions into separate devices. In this case, the device with wireless communication functionality can be called an RRH (Remote Radio Head), and the device with digital signal processing and control functions can be called a BBU (Base Band Unit). The RRH may be installed extending from the BBU, and they may be connected by a wired connection such as an optical fiber, or they may be connected wirelessly. Alternatively, instead of separating into RRH and BBU as described above, the base station may be separated into, for example, a Central Unit (CU), a Distributed Unit (DU), and a Radio Unit (RU). The DU may include, for example, the functions of the MAC (Media Access Control) layer. Furthermore, the DU may include, for example, the functionality of the RLC (Radio Link Control) layer. The RU may include at least an RF radio circuit. The DU and RU may be integrated into a single configuration.

[0021] Meanwhile, terminal 200 communicates with base station 100 via wireless communication.

[0022] Next, the base station 100 will be described. FIG. 2 is a diagram showing an example of the functional configuration diagram of the base station 100. The base station 100 includes a radio communication unit 110, a control unit 120, a storage unit 130, and a communication unit 140.

[0023] The radio communication unit 110 is composed of a transmission unit 111 and a reception unit 112, and performs radio communication with the terminal 200. Specifically, the transmission unit 111 transmits downlink signals such as a measurement signal (e.g., SSB, reference signal) for measurement to be measured by the terminal, a signal for the random access procedure, a signal of the RRC layer, a downlink data signal, and a downlink control signal to the terminal 200.

[0024] The reception unit 112 can receive uplink signals such as a signal for the random access procedure, a signal of the RRC layer, an uplink data signal, and an uplink control signal transmitted from the terminal 200.

[0025] The control unit 120 controls the base station 100. Specifically, the control unit 120 can control the establishment of the RRC connection with the terminal 200, the signal processing of the signal received by the reception unit 112, the creation of the transmission block (TB), the mapping of the transmission block to radio resources, etc.

[0026] The storage unit 130 can store, for example, downlink data signals.

[0027] The communication unit 140 is connected to a network device (e.g., a higher-level device, another base station) via wired or wireless and communicates. The data signal directed to the terminal 200 received by the communication unit 140 can be stored in the storage unit 130. Note that the radio communication unit 110 and the communication unit 140 may be collectively described as a communication unit.

[0028] Next, the terminal 200 will be described. FIG. 3 is a diagram showing an example of the functional configuration diagram of the terminal 200. As shown in FIG. 3, the terminal 200 includes a communication unit 210, a control unit 220, and a storage unit 230. These respective components are connected so that signals and data can be input and output in one direction or two directions. Note that the communication unit 210 can be described separately as a transmission unit 211 and a reception unit 212.

[0029] The transmitting unit 211 transmits data signals and control signals via wireless communication using an antenna. Note that the antenna may be common for both transmission and reception. The transmitting unit 211 transmits, for example, uplink signals such as signals for random access procedures, RRC layer signals, uplink data signals, and uplink control signals.

[0030] The receiving unit 212 receives downlink signals such as signals for random access procedures, downlink data signals, and downlink control signals transmitted from the base station 100. Further, the received signals may include, for example, reference signals used for channel estimation and demodulation.

[0031] The control unit 220 controls the terminal 200. Specifically, the control unit 220 can control the establishment of the RRC connection with the base station 100, signal processing of the signals received by the receiving unit 212, creation of a transmission block (TB), mapping of the transmission block to radio resources, etc.

[0032] The storage unit 230 can store, for example, uplink data signals. Further, the storage unit 230 can store configuration information (or setting information) regarding wireless communication transmitted from the base station 100.

[0033] Next, with reference to FIG. 4, the processing flow of the wireless communication system 1 in Embodiment 1 will be described. FIG. 4 is an example of a sequence diagram of the wireless communication system 1.

[0034] The base station 100 transmits a first signal to the terminal 200 (step S10). Note that the first signal may include, for example, first information regarding the repeated transmission (Repetition Transmission) of a second signal. Note that the first signal is, for example, an RRC layer signal or a physical layer signal. Further, the second signal is, for example, a physical layer control signal. Note that the physical layer control signal is, for example, a Physical Downlink Control Channel (PDCCH).

[0035] Terminal 200 receives a first signal from base station 100 (step S10). Then, terminal 200 performs a first process (step S20). The first process is the process by which terminal 200 receives a second signal transmitted from base station 100 in accordance with the first information it receives. Details of the first process will be described later.

[0036] Furthermore, the base station 100 performs a second process (step S30). The second process is to transmit a second signal to the terminal 200 in accordance with the first information. Details of the second process will be described later.

[0037] The base station 100 repeatedly transmits a second signal in response to the first information (steps S40A, 40B). Although Figure 4 shows an example where the second signal is transmitted twice, it is not limited to this. For example, the number of repeated transmissions can be an integer of 2 or more. The number of possible repeated transmissions can also be an integer multiple of 2. The terminal 200 receives the second signal transmitted in response to the first information (steps S40A, 40B). Hereafter, if steps S40A and S40B are not distinguished, they will simply be referred to as step S40.

[0038] The first and second processes will now be explained using Figure 5. Figure 5 shows an example of resource arrangement in Embodiment 1. In Figure 5, the number of repeated transmissions will be assumed to be 2.

[0039] Figure 5(A) shows an example of arranging CORESETs consecutively according to the number of repeated transmissions. Note that Figure 5(A) illustrates an example where CORESETs are arranged from the beginning of each slot, but it is not necessary to place CORESETs in some of the slots.

[0040] In Figure 5(A), slot n is configured with CORESET#m, and slot n+1 is configured with CORESET#(m+1). Furthermore, CORESET#m is configured with CORESET#m Ａ And, CORESET#m Ｂ This includes, for example, CORESET#mＡ It is set with second information which is information for setting a CORESET. The second information includes, for example, the length in the time axis of the CORESET and the length in the frequency axis. The length in the time axis of the CORESET indicates, for example, the number of OFDM symbols. Also, the length in the frequency axis of the CORESET is indicated, for example, using frequencyDomainResources.

[0041] The terminal 200 determines the position of CORESET#m according to the second information, and then determines the position of CORESET#m according to the first information. Ａ Specifically, the terminal 200 uses the resource consecutive to CORESET#m as the start position of CORESET#m. Note that CORESET#m has the same size of resource as CORESET#m. Ｂ Ａ Ｂ Ｂ Ａ

[0042] And, for example, when the base station 100 transmits a second signal using CORESET#m, the terminal 200 receives the initial transmission of the second signal in the search space SS#m of CORESET#m (corresponding to step S40A in FIG. 4), and receives the second signal transmitted the second time in the search space SS#m of CORESET#m (corresponding to step S40B in FIG. 4). By doing so, when the second signal is transmitted multiple times in slot n, the terminal 200 can grasp the positions where each is transmitted. Note that two signals of CORESET#m and CORESET#m may be received in one search space. Also, two signals of the second signal transmitted the first time and the second signal transmitted the second time using one CORESET#m may be received. Ａ Ａ Ｂ Ｂ Ａ Ｂ

[0043] Also, CORESET#(m + 1) has CORESET#(m + 1) Ａ ​​​​​​​​​​​And, CORESET#(m+1) Ｂ This includes, for example, CORESET#(m+1) Ａ CORESET#m Ａ Similarly, it is set with the second piece of information. Then, terminal 200, according to the first piece of information, CORESET#(m+1) Ｂ Determine the position. Specifically, terminal 200 is CORESET#(m+1) Ａ From consecutive resources, CORESET#(m+1) Ｂ This will be the starting position. Note that CORESET#(m+1) Ｂ This is CORESET#(m+1) Ａ This will result in a resource of the same size.

[0044] For example, if base station 100 transmits a second signal with CORESET#(m+1), terminal 200 will transmit CORESET#(m+1) Ａ Search space SS#(m+1) Ａ In this process, the initial transmission of the second signal is received (corresponding to step S40A in Figure 4), and CORESET#(m+1) Ｂ Search space SS#(m+1) Ｂ In this case, the second signal transmitted for the second time is received (corresponding to step S40B in Figure 4). In this way, if the second signal is transmitted multiple times in slot n+1, terminal 200 can determine the position where each transmission occurs. Note that in one search space, CORESET#(m+1) Ａ and CORESET#(m+1) Ｂ You may receive two signals. Alternatively, you may receive two signals in one CORESET#m: the second signal transmitted the first time and the second signal transmitted the second time.

[0045] Figure 5(B) shows an example of arranging CORESETs at predetermined intervals according to the number of repeated transmissions. Note that while Figure 5(B) illustrates an example where CORESETs are arranged from the beginning of each slot, it is not necessary to place CORESETs in some slots. Furthermore, explanations similar to those in Figure 5(A) are omitted.

[0046] In Figure 5(B), the difference from Figure 5(A) is, for example, in slot n, CORESET#m Ａ and CORESET#m Ｂ This is the point where time T0 is away. Also, for example, in slot n+1, CORESET#(m+1) Ａ and CORESET#(m+1) Ｂ This is the point where time T0 is away.

[0047] Here, time T0 may be set by including a third piece of information indicating an offset value in the first signal, by using a value specified in the specifications beforehand, or by using a third signal different from the first signal. The third signal may be, for example, an RRC layer signal, a MAC layer signal, or a physical layer signal. The third piece of information may also be indicated by the length of the CORESET. For example, if the actual length of the CORESET is an X symbol, the value of X + Y may be notified as the CORESET length to be notified, and the value of Y may be used as the offset value.

[0048] As described above, in the first process, terminal 200 determines a CORESET and / or search space for receiving the second signal according to the first information. Therefore, terminal 200 can receive the repeatedly transmitted second signal. Also, if terminal 200 can decode the second signal before receiving all of the repeatedly transmitted second signals, it may perform signal processing before receiving the remaining second signals. For example, if the second signal is transmitted twice, terminal 200 does not need to perform reception processing for the second second signal if it successfully decodes the second signal the first time it is transmitted.

[0049] Furthermore, as described above, in the second processing, the base station 100 determines the location of the CORESET and / or search space configured in the terminal 200 for transmitting the second signal, according to the first information. Therefore, the base station 100 can repeatedly transmit the second signal.

[0050] As described above, in Embodiment 1, the base station 100 transmits a first signal to the terminal 200 that includes first information regarding the number of times the second signal is repeatedly transmitted, and determines the location of the resource for the second signal to be repeatedly transmitted according to the first information. The terminal 200 receives the first information and, according to the first information, sets up a plurality of CORESETs corresponding to the number of times the second signal is repeatedly transmitted, and controls the terminal 200 to monitor the second signal to be repeatedly transmitted on the plurality of CORESETs. In this way, the location of the resource for the second signal to be repeatedly transmitted can be shared between the base station 100 and the terminal 200, making it possible to know the location of the signal to be repeatedly transmitted when the signal is repeatedly transmitted. Embodiment 2

[0051] Embodiment 1 describes a method for transmitting first information regarding the number of repeated transmissions from the base station 100 to the terminal 200, and for identifying the location of the resource for the second signal to be repeatedly transmitted according to the first information. Embodiment 2 describes a method for setting a CORESET corresponding to the number of repeated transmissions. In Embodiment 2, the wireless communication system, base station, and terminal are the same as in Embodiment 1, so their description is omitted.

[0052] The first and second processes in Embodiment 2 will be explained with reference to Figure 6. Figure 6 is a diagram showing an example of resource arrangement in Embodiment 2. In Figure 6, the number of repeated transmissions will be assumed to be 2.

[0053] In Embodiment 2, the base station 100 sets a CORESET corresponding to the number of repeated transmissions using the first information.

[0054] In Figure 6, CORESET#A and CORESET#B are set in slots n and n+1. In short, CORESET#A and CORESET#B are set in each slot. CORESET#A is set using, for example, second information, which is information for setting the CORESET. This second information includes, for example, the length of the CORESET on the time axis and the length on the frequency axis. The length of the CORESET on the time axis indicates, for example, the number of OFDM symbols. The length of the CORESET on the frequency axis is indicated using, for example, frequencyDomainResources.

[0055] Furthermore, CORESET#B is set using first information, which is information regarding the number of repeated transmissions. This first information includes, for example, information for setting one CORESET if the number of repeated transmissions is two, and information for setting three CORESETs if the number of repeated transmissions is four. The information for setting the CORESET includes, for example, the length of the CORESET on the time axis and the length on the frequency axis. The length of the CORESET on the time axis indicates, for example, the number of OFDM symbols. The length of the CORESET on the frequency axis is indicated, for example, using frequencyDomainResources. The information for setting the CORESET may also include, for example, an offset value. The offset value may be from the beginning of the slot or from the previous CORESET.

[0056] Alternatively, the first and second pieces of information may be combined into a single piece of information. In this case, for example, if the number of repeated transmissions is 1, it will include information for setting one CORESET, and if the number of repeated transmissions is 2, it will include information for setting two CORESETs. The number of pieces of information for setting CORESETs will correspond to the number of repeated transmissions.

[0057] Furthermore, search space SS#A is set for CORESET#A, and search space SS#B is set for CORESET#B. Terminal 200 also monitors search space SS#A and search space SS#B for each slot.

[0058] Furthermore, if the base station 100 transmits a second signal twice in slot n, for example, the first transmission of the second signal is transmitted on search space SS#A, and the second transmission of the second signal is transmitted on search space SS#B.

[0059] As described above, in Embodiment 2, the base station 100 transmits a first signal to the terminal 200 that includes first information regarding the number of times the second signal is repeatedly transmitted, and determines the location of the resource for the second signal to be repeatedly transmitted according to the first information. The terminal 200 also receives the first information and, according to the first information, sets up a plurality of CORESETs corresponding to the number of times the second signal is repeatedly transmitted, and controls the terminal 200 to monitor the second signal to be repeatedly transmitted on the plurality of CORESETs. In this way, the location of the resource for the second signal to be repeatedly transmitted can be shared between the base station 100 and the terminal 200, making it possible to know the location of the signal to be repeatedly transmitted when the signal is repeatedly transmitted. Embodiment 3

[0060] Embodiment 1 describes a method for transmitting first information regarding the number of repeated transmissions from the base station 100 to the terminal 200, and for identifying the location of the resource of the second signal to be repeatedly transmitted according to the first information. Embodiment 2 describes a method for setting a CORESET corresponding to the number of repeated transmissions. Embodiment 3 describes an example of adjusting the set CORESET according to the number of repeated transmissions. In Embodiment 3, the wireless communication system 1, base station 100, and terminal 200 are the same as in Embodiment 1, so their description is omitted.

[0061] The first and second processes in Embodiment 3 will be explained with reference to Figure 7. Figure 7 is a diagram showing an example of resource arrangement in Embodiment 3. In Figure 7, the number of repeated transmissions will be assumed to be 2.

[0062] In Figure 7, CORESETs are set in slots n, n+1, n+2, and n+3, respectively. Specifically, CORESET#n0 is configured in slot n, CORESET#n1 in slot n+1, CORESET#n2 in slot n+2, and CORESET#n3 in slot n+3. Each CORESET is set using, for example, second information, which is information for setting the CORESET. This second information includes, for example, the length of the CORESET on the time axis and the length on the frequency axis. The length of the CORESET on the time axis indicates, for example, the number of OFDM symbols. The length of the CORESET on the frequency axis is indicated using, for example, frequencyDomainResources. Although not shown in the diagram, each CORESET has a search space set up.

[0063] Then, based on the first piece of information regarding the number of repeated transmissions, CORESET#n0, CORESET#n1, CORESET#n2, and CORESET#n3 are divided into groups.

[0064] Here, if the number of repeated transmissions is 2, terminal 200 recognizes, for example, CORESET#n0 and CORESET#n1 as a first group to which the same second signal is transmitted, and CORESET#n2 and CORESET#n3 as a second group to which the same second signal is transmitted, and processes them. Also, if the number of repeated transmissions is 4, terminal 200 recognizes, for example, CORESET#n0, CORESET#n1, CORESET#n2, and CORESET#n3 as a group to which the same second signal is transmitted.

[0065] In this way, the terminal 200 can recognize, based on the second information, which of the repeated transmissions a CORESET set in each slot is being used for.

[0066] Furthermore, a bitmap corresponding to the group length may be notified as the first piece of information. For example, when performing two repeated transmissions using the first and fourth CORESETs out of four CORESETs, the bit information "1001" is transmitted from the base station 100 to the terminal 200 as the first piece of information. Also, for example, when performing four repeated transmissions using all four CORESETs out of four CORESETs, the bit information "1111" is transmitted from the base station 100 to the terminal 200 as the first piece of information. Note that the same second signal is transmitted within multiple CORESETs corresponding to bit lengths.

[0067] Next, we will explain the position of the fourth signal scheduled by the second signal. Figure 8 is a diagram showing an example of resource arrangement in Embodiment 3. Note that in Figure 8, the same symbols are used for the same parts as in Figure 7, and the explanation is omitted. Also, Figure 8 is an example showing parts of slot n and slot n+1 in Figure 7. Furthermore, in the following explanation, the number of repeated transmissions will be assumed to be 2.

[0068] In Figure 8, if the number of repeated transmissions of the second signal is set to two, there are two CORESET#n0 where the first transmission is sent and CORESET#n1 where the second transmission of the second signal is sent. In this case, it is unclear to the base station 100 whether the region scheduled for the second signal refers to region S#0 in slot n or region S#1 in slot n+1.

[0069] Here, we will describe two examples of how a repeatedly transmitted second signal can schedule a fourth signal.

[0070] (First example) The first example schedules area S#0 included in the first CORESET#n0 that starts repeated transmission. For example, if terminal 200 fails to receive the second signal in CORESET#n0 but succeeds in receiving the second signal in CORESET#n1, it recognizes that the second signal received in CORESET#n1 is scheduling information for area S#0 and processes it. In short, terminal 200 uses CORESET#n0 as the reference for scheduling information of the second signal received in CORESET#n1.

[0071] (Second example) The second example schedules region S#1 included in the last CORESET#n1 of repeated transmissions. For example, if terminal 200 successfully receives the second signal in CORESET#n0, it recognizes that the second signal received in CORESET#n0 is scheduling information for region S#1 and processes it. In short, terminal 200 uses CORESET#n1 as the reference for scheduling information of the second signal received in CORESET#n0.

[0072] Furthermore, if you are performing more than two repeated transmissions, you may schedule the area after the intermediate CORESET.

[0073] In short, the scheduling information schedules the fourth signal based on one of the multiple CORESETs on which the second signal is repeatedly transmitted.

[0074] Furthermore, the area for scheduling may be defined in advance in the standard, or information specifying the area for scheduling may be notified from the base station 100 to the terminal 200. The information specifying the area for scheduling may be notified by the first signal, the second signal, or a signal different from the first signal and the second signal.

[0075] As described above, in Embodiment 3, the base station 100 transmits a first signal to the terminal 200 that includes first information regarding the number of times the second signal is repeatedly transmitted, and determines the location of the resource for the second signal to be repeatedly transmitted according to the first information. The terminal 200 also receives the first information and, according to the first information, sets up a plurality of CORESETs corresponding to the number of times the second signal is repeatedly transmitted, and controls the plurality of CORESETs to monitor the second signal that is repeatedly transmitted. In this way, the location of the resource for the second signal that is repeatedly transmitted can be shared between the base station 100 and the terminal 200, making it possible to know the location of the signal that is repeatedly transmitted when the signal is repeatedly transmitted.

[0076] Furthermore, in Embodiment 3, the position of the fourth signal scheduled by the second signal is scheduled based on one of the multiple CORESETs. Therefore, the position of the resource to which the fourth signal is mapped becomes clear. Embodiment 4

[0077] Embodiment 1 describes a method for transmitting first information regarding the number of repeated transmissions from the base station 100 to the terminal 200, and for identifying the location of the resource of the second signal to be repeatedly transmitted according to the first information. Embodiment 2 describes a method for setting a CORESET corresponding to the number of repeated transmissions. Embodiment 3 describes an example of adjusting the set CORESET according to the number of repeated transmissions. Embodiment 4 describes an example adapted to NTN (Non-Terrestrial Network). In Embodiment 4, the wireless communication system 1 and the terminal 200 are the same as in Embodiment 1, so their description is omitted.

[0078] The base station 100 at NTN will be explained using Figure 9. Figure 9 is a diagram showing an example of a functional block configuration of the base station 100 in Embodiment 4. The base station 100 at NTN performs the same processing as the base station 100 described in Embodiments 1 to 3, for example.

[0079] In NTN, base station 100N includes a service link provision system 150 and the functions of a normal (TN) base station 100 (hereinafter referred to as ground station 160). The service link provision system 150 includes a gateway device 151 and an NTN payload unit 152. The gateway device 151 communicates with flying objects 153 (such as unmanned aerial vehicles and spacecraft) other than ground-based radio equipment (terminals 200 and base station 100). Flying objects 153 are, for example, unmanned aerial vehicles such as HAPS (High Altitude Platform Station) or spacecraft such as satellites, and include at least an NTN payload unit 152. Flying objects 153 receive signals from the gateway device 151 (or terminal 200) and transmit the received signals to terminal 200 (or gateway device 160) by operating as a repeater (e.g., repeater, relay station). Furthermore, the NTN payload unit 152 may also possess some of the functions of the ground station 160.

[0080] The communication path between the gateway device 151 and the NTN payload unit 152 is called the feeder link, and the communication path between the NTN payload unit 152 and the terminal 200 is called the service link. Note that the communication method used for the feeder link is not limited to NR; any communication method may be used.

[0081] Furthermore, the base station 100N in NTN may be configured as a CU (Centralized Unit) and a DU (Distributed Unit). The CU is connected to the core network, and the DU is connected to the terminal 200. The communication path between the CU and the DU may be connected via a fronthaul interface (F1 interface). Also, multiple DUs may be configured to be connected to one CU.

[0082] In the example shown in Figure 9, the data (DL data, downlink data) transmitted from the core network 300 to the terminal 200 is transmitted from the core network 300 to the ground station 160 of the base station 100N. The ground station 160 transmits the received data to the aircraft 153 via a feeder link from the gateway device 151. The aircraft 153 operates as a repeater and transmits (forwards) the received radio signal to the terminal 200 using a service link.

[0083] Furthermore, data (UL data, uplink data) transmitted from terminal 200 to core network 300 is transmitted from terminal 200 to base station 100N's flying object 153 using a service link. The flying object 153 then operates as a repeater and transmits (forwards) the received radio signal to gateway device 151 using a feeder link. The gateway device 151 then transmits the received radio signal to ground station 160. The ground station 160 then transmits the received data to core network 300.

[0084] As described above, in Embodiment 4, the method described in Embodiments 1 to 3 is applied to the base station 100N in NTN. By doing so, the position of the second signal, which is repeatedly transmitted between the base station 100N and the terminal 200 using the method described in Embodiments 1 to 3, can be determined. Hardware configuration of each device in each embodiment

[0085] The hardware configuration of each device in the wireless communication system of each embodiment will be described based on Figures 10 to 11.

[0086] Figure 10 shows an example of the hardware configuration of base station 100 (or base station 100N). As shown in Figure 10, base station 100 (or base station 100N) has the following hardware components: an RF (Radio Frequency) circuit 320 equipped with an antenna 310, a CPU (Central Processing Unit) 330, a DSP (Digital Signal Processor) 340, a memory 350, and a network IF (Interface) 360. The CPU is connected via a bus to enable input and output of various signals and data signals. The memory 350 includes, for example, at least one of RAM (Random Access Memory) such as SDRAM (Synchronous Dynamic Random Access Memory), ROM (Read Only Memory), and flash memory, and stores programs, control information, and data signals.

[0087] The correspondence between the functional configuration of the base station 100 shown in Figure 2 and the hardware configuration of the base station 100 shown in Figure 10 will be explained. The transmitting unit 111 and the receiving unit 112 (or wireless communication unit 110) are realized by, for example, an RF circuit 320, or an antenna 310 and an RF circuit 320. The control unit 120 is realized by, for example, a CPU 330, a DSP 340, a memory 350, and a digital electronic circuit (not shown). Examples of digital electronic circuits include ASIC (Application Specific Integrated Circuit), FPGA (Field Programmable Gate Array), and LSI (Large Scale Integration). The storage unit 130 is realized by, for example, a memory 350. Furthermore, the communication unit 140 is implemented, for example, by a network IF 360.

[0088] Figure 11 shows an example of the hardware configuration of terminal 200. As shown in Figure 11, terminal 200 has, as hardware components, an RF circuit 420 equipped with an antenna 410, a CPU 430, a DSP 440, and a memory 450. The memory 450 includes at least one of RAM such as SDRAM, ROM, and flash memory, and stores programs, control information, and data signals.

[0089] The correspondence between the functional configuration of terminal 200 shown in Figure 3 and the hardware configuration of terminal 200 shown in Figure 11 will be explained. The transmitting unit 211 and the receiving unit 212 (or the communication unit 210) are realized by, for example, an RF circuit 420, or an antenna 410 and an RF circuit 420. The control unit 220 is realized by, for example, a CPU 430, a DSP 440, a memory 450, and a digital electronic circuit (not shown). Examples of digital electronic circuits include ASICs, FPGAs, and LSIs. The storage unit 230 is realized by, for example, a memory 450.

[0090] Furthermore, each embodiment may be combined as appropriate, within the bounds of consistency.

[0091] Although each embodiment describes an example of a base station and a terminal, the disclosed technology is not limited to these examples and can be applied to various devices such as electronic equipment mounted on automobiles, trains, airplanes, satellites, electronic equipment transported by drones, robots, AV equipment, home appliances, office equipment, vending machines, and other everyday devices.

[0092] Furthermore, although each embodiment was explained using fifth-generation mobile communication as an example, the disclosed technology is not limited to these. For example, the disclosed technology may be applied to mobile communication of different generations, such as sixth-generation or seventh-generation.

[0093] 1 Wireless Communication System 100 100N Base Station C10 Cell 110 Wireless Communication Unit 111 Transmitter Unit 112 Receiver Unit 120 Control Unit 130 Memory Unit 140 Communication Unit 150 Service Link Provisioning System 151 Gateway Device 152 NTN Payload Unit 153 Flying Object 160 Ground Station 200 Terminal 210 Communication Unit 211 Transmitter Unit 212 Receiver Unit 220 Control Unit 230 Memory Unit 300 Core Network 310 Antenna 320 RF Circuit 330 CPU 340 DSP 350 Memory 360 Network IF 410 Antenna 420 RF Circuit 430 CPU 440 DSP 450 Memory

Claims

1. A terminal having: a receiving unit that receives a first signal from a base station that includes first information relating to the number of times a second signal is repeatedly transmitted; and a control unit that sets up a plurality of CORESETs corresponding to the number of times the second signal is repeatedly transmitted according to the first information, and controls each of the plurality of CORESETs to monitor the repeatedly transmitted second signal.

2. The terminal according to claim 1, wherein the first signal is a signal of the RRC layer and the second signal is PDCCH.

3. The terminal according to claim 1, wherein each of the plurality of CORESETs is configured with a search space for monitoring the second signal.

4. The terminal according to claim 1, wherein the plurality of CORESETs are configured within the same slot.

5. The terminal according to claim 1, wherein the plurality of CORESETs are spaced apart at predetermined intervals.

6. The terminal according to claim 5, wherein the receiving unit receives information of an offset value corresponding to the predetermined interval via the first signal or a third signal different from the first signal.

7. The terminal according to claim 1, wherein the first information is comprised of a bit length corresponding to the plurality of CORESETs, each of the plurality of bits included in the bit length corresponds to each of the plurality of CORESETs, and each of the plurality of bits indicates whether the corresponding CORESET among the plurality of CORESETs is enabled or disabled.

8. The terminal according to claim 1, wherein the second signal includes scheduling information for scheduling the fourth signal, and the scheduling information is scheduling information based on any of the plurality of CORESETs.

9. A base station comprising: a transmitting unit that transmits a first signal to a terminal, which includes first information relating to the number of times the second signal is repeatedly transmitted; and a control unit that, in accordance with the first information, controls each of a plurality of CORESETs corresponding to the number of times the second signal is repeatedly transmitted to transmit the second signal.

10. The base station according to claim 9, wherein the base station corresponds to a non-terrestrial communication system.

11. A wireless communication system comprising: a base station that transmits a first signal including first information relating to the number of times a second signal is repeatedly transmitted; and a terminal that receives the first signal, sets up a plurality of CORESETs corresponding to the number of times the second signal is repeatedly transmitted according to the first information, and controls each of the plurality of CORESETs to monitor the repeatedly transmitted second signal.

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