Terminal, base station, and wireless communication system

Abstract

A terminal according to the present invention comprises a reception unit, a control unit, and a transmission unit. The reception unit receives a first signal including first information that sets a resource for transmitting a second signal of a random access procedure, said first information being for setting at least one first resource of a first group set on an uplink region set on a downlink section or a flexible section within a plurality of sections and at least one second resource of a second group set on an uplink section or the flexible section within the plurality of sections. The control unit: selects, from among said at least one first resource and said at least one second resource, a resource that transmits the second signal; uses a first method to control the second signal when the selected resource is included in said at least one first resource; and uses a second method to control the second signal when the selected resource is included in said at least one second resource. The transmission unit uses the selected resource to transmit the second signal.

Description

Terminal, base station and wireless communication system

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

[0002] In today's networks, traffic from mobile devices (smartphones and feature phones) accounts for the majority of network resources, and traffic from mobile devices is expected to continue to grow.

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

[0004] In addition, in the working group of the 3rd Generation Partnership Project (3GPP (registered trademark)), an international standardization project, extension technologies for the above communication standards are currently being continuously studied and standardized.

[0005] For example, a 3GPP working group is considering the introduction of a technology called SBFD (Subband Full Duplex) (Non-Patent Document 15). This is a technology that improves uplink latency and expands coverage by configuring uplink resources (UL (Uplink) subbands) on downlink symbols and / or flexible symbols.

[0006] Furthermore, a working group of 3GPP has proposed allocating RACH (Random Access Channel) occasions on the configured UL subband in SBFD (Non-Patent Document 16).

[0007] 3GPP TS 37.324 V17.0.03GPP TS 37.340 V18.0.03GPP TS 38.201 V18.0.03GPP TS 38.202 V18.1.03GPP TS 38.211 V18.1.03GPP TS 38.212 V18.1.03GPP TS 38.213 V18.1.03GPP TS 38.214 V18.1.03GPP TS 38.215 V18.1.03GPP TS 38.300 V18.0.03GPP TS 38.321 V18.0.03GPP TS 38.322 V18.0.03GPP TS 38.323 V18.0.03GPP TS 38.331 V18.0.03GPP TR 38.858 V18.0.0R1-2401676

[0008] Incidentally, it is expected that the impact on signals transmitted or received by other terminals will be different when transmitting signals related to the random access procedure on the UL subband and when transmitting signals related to the random access procedure on a subband other than the UL subband.

[0009] For example, when a terminal configured with SBFD transmits a signal related to a random access procedure on the UL subband, the signal uses a nearby frequency domain (e.g., an adjacent frequency domain) in the same time domain (e.g., within the same slot), which increases the likelihood of affecting other terminals. For example, the signal related to the random access procedure transmitted by the terminal configured with SBFD is likely to interfere with signals received by other terminals. Furthermore, for example, the signal related to the random access procedure transmitted by the terminal configured with SBFD is likely to be interfered with by signals transmitted or received by other terminals, which increases the likelihood of the reception quality of the signal related to the random access procedure transmitted from the terminal configured with SBFD and received by the base station being reduced.

[0010] Therefore, a control method is required for transmitting signals related to the random access procedure to a terminal for which SBFD is set, taking into consideration the impact on other terminals.

[0011] The disclosed technology has been made in view of the above, and provides a method for controlling transmission of signals related to a random access procedure of a terminal in which SBFD is configured.

[0012] In one aspect, a terminal is provided that includes: a receiving unit that receives a first signal including first information for setting resources for transmitting a second signal, which is a signal for a random access procedure, the first information being for setting one or more first resources of a first group that are set on an uplink area that is set on a downlink section or a flexible section within a plurality of sections, and one or more second resources of a second group that are set on an uplink section or a flexible section within the plurality of sections; a control unit that selects a resource for transmitting the second signal from the one or more first resources and the one or more second resources, and controls the second signal using a first method if the selected resource is included in the one or more first resources, and controls the second signal using a second method if the selected resource is included in the one or more second resources; and a transmitting unit that transmits the second signal using the selected resource.

[0013] It is possible to provide a method for controlling the transmission of signals related to the random access procedure of a terminal configured with SBFD, taking into consideration the impact on other terminals.

[0014] FIG. 1 is a diagram showing an example of a network configuration according to a first embodiment. FIG. 2 is a functional block diagram of a base station in a wireless communication system according to the first embodiment. FIG. 3 is a functional block diagram of a terminal in the wireless communication system according to the first embodiment. FIG. 4 is a diagram showing an example of the position of an RO set in a terminal in which SBFD is set. FIG. 5 is a diagram showing an example of a sequence in a wireless communication system according to the first embodiment. FIG. 6 is a diagram showing an example of a control flow of a terminal in the first embodiment. FIG. 7 is a diagram showing an example of a sequence in a communication system according to the second embodiment. FIG. 8 is a diagram showing an example of a control flow method of a terminal 200 in the second embodiment. FIG. 9 is a diagram showing an example of a delta preamble value. FIG. 10 is a diagram showing an example of an RO set in a terminal 200 in which SBFD is set. FIG. 11 is a diagram showing an example of the hardware configuration of a base station. FIG. 12 is a diagram showing an example of the hardware configuration of a terminal.

[0015] The present embodiment will be described in detail below with reference to the drawings. The problems and examples in this specification are merely examples and do not limit the scope of the rights of the present application. In particular, even if the expressions used are different, the technology of the present application can be applied as long as they are technically equivalent, and do not limit the scope of the rights. Furthermore, each embodiment can be combined as appropriate within the scope of not causing any contradiction in the processing content.

[0016] Furthermore, the terms used and technical contents described in this specification may be those described in specifications and contributions as standards related to communications, such as 3GPP, as appropriate. Examples of such specifications include those described in Non-Patent Documents 1 to 14.

[0017] Hereinafter, embodiments of a base station, a terminal, a wireless communication system, and a communication method disclosed in the present application will be described in detail with reference to the accompanying drawings. Note that the disclosed technology is not limited to the following embodiments. First Embodiment

[0018] 1 is a diagram showing an example of a wireless communication system 1 according to the first embodiment. The wireless communication system 1 includes a base station 100, a terminal 200A, and a terminal 200B. The base station 100 forms a cell C10. The terminals 200A and 200B are present in the cell C10. When there is no need to distinguish between the terminals 200A and 200B, they will be simply referred to as terminal 200.

[0019] The base station 100 may be, for example, a small wireless base station such as a macro wireless base station or a pico wireless base station (including a micro wireless base station, a femto wireless base station, etc.), or may be a wireless base station of various scales, and may be referred to as a wireless communication device, a communication device, a transmitting device, etc. The terminal 200 may be, for example, a wireless terminal such as various devices having a wireless communication function, such as a mobile phone, a smartphone, a PDA (Personal Digital Assistant), a personal computer, a vehicle, an airplane, a drone, or a device (sensor device, etc.) mounted on a robot, AV equipment, home appliances, office equipment, vending machines, other household equipment, industrial equipment, etc., and may be referred to as a wireless communication device, a communication device, a receiving device, a mobile station, etc.

[0020] The base station 100 is connected to a network device (a higher-level device or another base station) not shown in the figure via a wired connection. Note that the base station 100 may be connected to the network device wirelessly instead of via a wired connection.

[0021] The base station 100 may be configured such that the wireless communication function with the terminal 200 and the digital signal processing and control functions are separated into separate devices. In this case, the device having the wireless communication function can be called an RRH (Remote Radio Head), and the device having the digital signal processing and control functions can be called a BBU (Base Band Unit). The RRHs may be installed extending from the BBU, and they may be connected by a wired connection such as optical fiber. Alternatively, they may be connected wirelessly. Instead of the aforementioned RRH and BBU, the base station 100 may be separated into, for example, a Central Unit (CU), a Distributed Unit (DU), and a Radio Unit (RU). The DU includes, for example, a MAC (Media Access Control) layer function. The DU may also include, for example, a function of an RLC (Radio Link Control) layer. The RU includes at least an RF wireless circuit. The DU and RU may also be integrated into one unit.

[0022] On the other hand, the terminal 200 communicates with the base station 100 via wireless communication.

[0023] Next, the base station 100 will be described. Fig. 2 is a diagram showing an example of a functional configuration diagram of the base station 100. The base station 100 has a wireless communication unit 110, a control unit 120, a storage unit 130, and a communication unit 140.

[0024] The wireless communication unit 110 is composed of a transmitting unit 111 and a receiving unit 112, and performs wireless communication with the terminal 200. Specifically, the transmitting unit 111 transmits to the terminal 200 downlink signals such as measurement signals (e.g., SSB, reference signals) that the terminal is to measure, random access procedure signals, RRC layer signals, downlink data signals, and downlink control signals.

[0025] The receiving unit 112 can receive uplink signals transmitted from the terminal 200, such as signals of a random access procedure, signals of an RRC layer, uplink data signals, and uplink control signals.

[0026] The control unit 120 controls the base station 100. Specifically, the control unit 120 can control the establishment of an RRC connection with the terminal 200, signal processing of signals received by the receiving unit 112, creation of transmission blocks (TBs), mapping of the transmission blocks to radio resources, etc. The control unit 120 can also control the setting of SBFD (Subband Full Duplex).

[0027] The storage unit 130 can store, for example, downstream data signals.

[0028] The communication unit 140 connects to a network device (e.g., a higher-level device or another base station device) via a wired or wireless connection to communicate with the device. Data signals received by the communication unit 140 and directed to the terminal 200 can be stored in the storage unit 130. The wireless communication unit 110 and the communication unit 140 may be collectively referred to as the communication unit.

[0029] Next, the terminal 200 will be described. Fig. 3 is a diagram showing an example of a 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 components are connected to each other so as to enable unidirectional or bidirectional input and output of signals and data. The communication unit 210 can be described as being divided into a transmission unit 211 and a reception unit 212.

[0030] The transmitter 211 transmits data signals and control signals by wireless communication via an antenna. Note that the antenna may be common for both transmission and reception. The transmitter 211 transmits uplink signals such as random access procedure signals, RRC layer signals, uplink data signals, and uplink control signals, for example.

[0031] The receiver 212 receives downlink signals such as a random access procedure signal, a downlink data signal, a downlink control signal, etc. transmitted from the base station 100. The received signals may also include reference signals used for channel estimation and demodulation, for example.

[0032] The control unit 220 controls the terminal 200. Specifically, the control unit 220 can control the establishment of an RRC connection with the base station 100, signal processing of signals received by the receiving unit 212, creation of transmission blocks (TBs), mapping of the transmission blocks to radio resources, etc. The control unit 220 can also perform control related to SBFD.

[0033] The storage unit 230 can store, for example, uplink data signals, and can also store configuration information (or setting information) related to wireless communication transmitted from the base station 100.

[0034] A description will be given of a method for configuring SBFD and a method for configuring RO (RACH Occasion) in embodiment 1. Note that RO is, for example, a resource capable of transmitting a signal for a random access procedure.

[0035] The transmitter 111 of the base station 100 transmits, to the terminal 200, first information, which is information regarding the configuration of a random access procedure, and second information, which is information regarding the configuration of SBFD. The transmitter 111 of the base station 100 may also transmit third information, which is information for configuring the uplink and downlink segments of each slot or the uplink and downlink segments of symbols included in each slot. The terminal 200 receives the first information and the second information from the base station 100. The terminal 200 may also receive the third information from the base station 100. The first information and the second information may be transmitted in the same signal or in different signals. The first information may also be rephrased as information for configuring the uplink and downlink segments in multiple segments. The second information includes, for example, at least information for configuring RO, and includes, for example, information regarding the configuration of RO on the UL subband of SBFD and information regarding the configuration of RO in areas where SBFD is not configured.

[0036] An example of a set RO will now be described with reference to Fig. 4. Fig. 4 is a diagram showing an example of the location of an RO set in terminal 200 for which SBFD is set.

[0037] In Fig. 4, the UL (Uplink), DL (Downlink), and F (Flexible) of each of sections S1 to S5 are set, for example, by the third information. The frequency corresponding to sections S1 to S5 is frequency F1. The UL subbands on the DL (Downlink) and F (Flexible) are set, for example, by the second information. In Fig. 4, the frequency of the UL subband is frequency F2.

[0038] Furthermore, RO1-1 and RO1-2 capable of transmitting a random access procedure signal on the UL subband, and RO2-1, RO2-2, and RO2-3 capable of transmitting a random access procedure signal on the area where SBFD is not configured, are configured by the first information. Hereinafter, resources capable of transmitting a random access procedure signal on the UL subband are collectively referred to as the first RO region, and resources capable of transmitting a random access procedure signal on the area where UL subband is not configured are collectively referred to as the second RO region. The first RO region and the second RO region may be configured using separate information elements or the same information element. The first RO region and the second RO region may be configured using separate messages or the same message. The resources (RO) included in the first RO region are an example of one or more first resources belonging to a first group. The resources (RO) included in the second RO region are an example of one or more second resources belonging to a second group.

[0039] The flow of processing up to when terminal 200 transmits a signal of the random access procedure will be described with reference to Fig. 5. Fig. 5 is a diagram showing an example of a sequence of the wireless communication system in embodiment 1. Note that in the sequence diagram shown in Fig. 5, steps S10 to S30 may be included as part of the random access procedure.

[0040] The transmitter 111 of the base station 100 transmits a first signal (step S10). The first signal includes, for example, at least first information. The receiver 212 of the terminal 200 receives the first signal. Note that the first signal is, for example, a Radio Resource Control (RRC) layer signal. The first signal is, for example, a Master Information Block (MIB) message or a System Information Block (SIB) 1. Note that the transmitter 111 of the base station 100 may include at least one of the second information and the third information in the first signal, or may transmit the second information and the third information in separate RRC layer signals.

[0041] When determining to execute a random access procedure or retransmit a second signal, the control unit 220 of the terminal 200 controls to execute a first process (step S20). The first process is a process of selecting resources for transmitting a signal of the random access procedure from the first RO region and / or the second RO region. For example, the control unit 220 of the terminal 200 determines to execute the random access procedure when, for example, receiving a message 0 from the base station 100. Here, the message 0 may be a PDCCH order or a handover command instructing a cell change. Furthermore, when the terminal 200 attempts to connect (camp on) to a cell for the first time and receives the message 0 from the base station 100, the control unit 220 of the terminal 200 may determine to execute the random access procedure. Furthermore, for example, when the control unit 220 of the terminal 200 cannot receive a response signal to the second signal, the control unit 220 determines to retransmit the second signal. Note that FIG. 5 illustrates an example of when it is determined that the random access procedure has been executed. In short, step S30 in FIG. 5 indicates the initial transmission of the second signal.

[0042] The transmitter 211 of the terminal 200 transmits a second signal, which is a signal for the random access procedure, using the resource selected in the first process (step S30). Note that, for example, if the first process selects RO1-1 belonging to the first RO region, the transmitter 211 of the terminal 200 transmits the second signal using a first setting for transmitting a signal for the random access procedure on the UL subband. Note that, for example, if the first process selects RO2-1 belonging to the second RO region, the transmitter 211 of the terminal 200 transmits the second signal using a second setting for transmitting a signal for the random access procedure on a region where no UL subband is set.

[0043] The first setting is, for example, a setting for controlling a signal of a random access procedure using a first method. The second setting is, for example, a setting for controlling a signal of a random access procedure using a second method. The first setting may be, for example, included in the first information and transmitted, or may be defined in advance. For example, a part of the first setting may be included in the first information and transmitted, and the remaining setting part that is not transmitted may be defined in advance.

[0044] The first process will now be described with reference to Fig. 6. Fig. 6 is a diagram showing an example of a control flow of terminal 200 in the first embodiment.

[0045] When the control unit 220 of the terminal 200 determines to execute the random access procedure, the control unit 220 determines whether to transmit a second signal (e.g., PRACH) using resources of the first RO region (step S21). Note that the selection of the first RO region or the second RO may be based on, for example, a measurement result of a reference signal transmitted from the base station 100, or the type of uplink data (e.g., whether the data is highly urgent), or may be randomly selected.

[0046] When the control unit 220 of the terminal 200 determines that the signal of the random access procedure is to be transmitted in the first RO region (step S21: Yes), the control unit 220 selects a resource (e.g., RO1-1) from the first RO region to transmit the random access procedure (step S22).When the control unit 220 of the terminal 200 determines that the signal of the random access procedure is to be transmitted in the second RO region (step S21: No), the control unit 220 selects a resource (RO2-1) from the second RO to transmit the random access procedure (step S23).

[0047] As described above, in the first embodiment, the terminal 200 receives a first signal including first information for configuring resources for transmitting a second signal, which is a signal for a random access procedure, the first information being for configuring one or more first resources of a first group configured in an uplink region configured in a downlink region or a flexible region within one or more sections, and one or more second resources of a second group configured in an uplink region or a flexible region within the multiple sections. The terminal 200 also selects a resource for transmitting the second signal from the one or more first resources and the one or more second resources, and if the selected resource is included in the one or more first resources, controls the second signal using a first method, and if the selected resource is included in the one or more second resources, controls the second signal using a second method. In short, when transmitting a signal for a random access procedure, the terminal 200 controls transmission of the second signal according to the selected resource (RO). For example, if the terminal 200 selects a resource in a first RO region, it can control the second signal using the first method. Furthermore, for example, when terminal 200 selects a resource of the second RO, terminal 200 can control the second signal using the second method. Therefore, for example, when transmitting the second signal using the resource (RO) on the UL subband, the maximum transmission power can be set to a value that is set in consideration of the impact on other terminals. Therefore, it is possible to control transmission of a signal related to a random access procedure of terminal 200 for which SBFD is configured, taking into consideration the impact on other terminals. Embodiment 2

[0048] In the first embodiment, an example has been described in which terminal 200 controls the second signal using a first method when transmitting the second signal using resources on the UL subband, and controls the second signal using a second method when transmitting the second signal using resources other than the UL subband. In the second embodiment, an example of control when terminal 200 retransmits the second signal will be described. Note that in the second embodiment, the wireless communication system, base station, and terminal are the same as in the first embodiment, so description thereof will be omitted. Note that in the third embodiment, the wireless communication system, base station, and terminal are the same as in the first embodiment, so description thereof will be omitted.

[0049] The flow of processing in the second embodiment will be described with reference to Fig. 7. Fig. 7 is a diagram showing an example of a sequence of a communication system in the second embodiment. In Fig. 7, the same processing as in Fig. 5 is assigned the same step number.

[0050] Transmitter 211 of terminal 200 transmits the second signal to base station 100 (step S30). Note that the resource (RO) for transmitting the second signal may use the method described in the first embodiment or another method.

[0051] The control unit 220 of the terminal 200 controls the terminal 200 to perform a second process, which is a process for retransmitting the second signal when a response signal to the second signal cannot be received after transmitting the second signal (step S40). For example, the control unit 220 of the terminal 200 starts a monitoring period for the response signal in response to the transmission of the second signal, and determines that the response signal cannot be received when the response signal cannot be received within the monitoring period. The second process also includes a process for selecting a resource (RO) for retransmission. The second process may be combined with the first process described in the first embodiment as a single process. In other words, the second process can be described as part of the first process.

[0052] The transmitter 211 of the terminal 200 transmits the second signal via the resource selected in the second process (step S50). In short, step S50 indicates retransmission of the second signal.

[0053] If a resource belonging to a first RO region (e.g., region RO1-1 shown in FIG. 4) is selected in the second processing, the transmitter 211 of the terminal 200 transmits the second signal using the first configuration for transmitting a signal of the random access procedure on the UL subband. If a resource belonging to a second RO region (e.g., region RO2-1 shown in FIG. 4) is selected in the second processing, the transmitter 211 of the terminal 200 transmits the second signal using the second configuration for transmitting a signal of the random access procedure on a region where no UL subband is set.

[0054] The second process will now be described with reference to Fig. 8. Fig. 8 is a diagram showing an example of a control flow method of the terminal 200 in the second embodiment.

[0055] The control unit 220 of the terminal 200 determines that a response signal to the second signal has not been received (step S51) and determines whether to change the RO region for transmitting the second signal (step S52). For example, if the second signal was transmitted using resources (RO) of the first RO region in step S30, the control unit 220 determines whether to transmit the second signal in the second RO region. Note that, for example, the control unit 220 of the terminal 200 determines whether to change the region based on at least one of the number of failed transmissions of the second signal, the transmission power of the second signal, the transmission opportunity of the second signal, and the type of data being generated. For example, if the number of failed transmissions of the second signal is equal to or exceeds a predetermined value, the control unit 220 determines to switch the region for transmitting the second signal. Furthermore, for example, if the transmission power of the second signal is equal to or exceeds a predetermined value, the control unit 220 determines to switch the region for transmitting the second signal. Furthermore, if the transmission opportunity of the second signal is equal to or less than a predetermined value, the control unit 220 determines to switch the region for transmitting the second signal. Furthermore, the control unit 220 of the terminal 200 may determine whether to change the RO region using the relationship between the target power (first power) for the second signal on the UL subband and the target power (second power) for the second signal on a region other than the UL subband. For example, the control unit 220 of the terminal 200 determines to use the same region when the first power is equal to or lower than the second power. Furthermore, for example, the control unit 220 of the terminal 200 determines to switch the region for transmitting the second signal when the first power is greater than the second power. Furthermore, the control unit 220 of the terminal 200 may determine whether to change the RO region using the relationship between the maximum transmittable transmission power (third power) for the second signal on the UL subband and the maximum transmittable transmission power (fourth power) for the second signal on a region other than the UL subband. For example, the control unit 220 of the terminal 200 determines to switch the region for transmitting the second signal when the third power and the fourth power are equal and the second signal has been transmitted using resources (RO) of the first RO region. Also, for example, if the fourth power is greater than the third power, the control unit 220 of the terminal 200 determines that the same region is to be used.The first power, the second power, the third power, and the fourth power are set, for example, by information sent from the base station 100 to the terminal 200. Using the same region may mean not changing the RO region used for retransmission of the second signal.

[0056] If it is determined to change the RO region for transmitting the second signal (step S52: Yes), control unit 220 of terminal 200 selects resources (RO) of a different region (step S53). For example, if terminal 200 has transmitted the second signal using resources (RO) of the first RO region in step S30, terminal 200 selects resources of the second RO region. Also, for example, if terminal 200 has transmitted the second signal using resources (RO) of the second RO region in step S30, terminal 200 selects resources of the first RO region.

[0057] If it is determined not to change the RO region for transmitting the second signal (step S52: No), control unit 220 of terminal 200 selects resources (RO) of the same region (step S54). For example, if terminal 200 transmitted the second signal using resources (RO) of the first RO region in step S30, terminal 200 selects resources (RO) of the first RO region. Also, for example, if terminal 200 transmitted the second signal using resources (RO) of the second RO region in step S30, terminal 200 selects resources (RO) of the second RO region.

[0058] When the terminal 200 changes the RO region for transmitting the second signal, the transmission power of the second signal may be calculated based on the transmission power of the previous transmission, or may be set to the maximum transmission power before or after the change. For example, the control unit 220 of the terminal 200 may calculate the transmission power by inheriting the value of a ramping counter used to calculate the transmission power of the previous transmission, or may calculate the transmission power by adding a predetermined value to the value of the ramping counter used to calculate the transmission power of the previous transmission. Here, the predetermined value may be an integer greater than or equal to 1. Furthermore, the control unit 220 of the terminal 200 may use a value corresponding to the reception target power (e.g., the transmission power of the previous transmission (or the maximum transmission power) - the reception target power) as an offset value from the transmission power of the previous transmission or the maximum transmission power to calculate the transmission power when the transmission power is changed. For example, after changing the RO region, the control unit 220 of the terminal 200 adds the offset value to the calculated transmission power.

[0059] Furthermore, when terminal 200 changes the region for transmitting the second signal, control unit 220 of terminal 200 may calculate the transmission power without considering the transmission power of the second signal transmitted in another RO region. In other words, for example, control unit 220 of terminal 200 calculates the transmission power without inheriting the value of the ramping counter used to calculate the transmission power of the previous transmission. In other words, the value of the ramping counter is set to its initial value (initialized). Here, the initial value may be 0, 1, or a value greater than 1.

[0060] Furthermore, when terminal 200 uses the resources of the same RO region in retransmission of the second signal, control unit 220 of terminal 200 may perform control to repeatedly transmit the second signal (Repetition Transmission). Note that the number of repeated transmissions is determined by, for example, SSB-RSRP (Synchronization Signal Block-Reference Signal Received Power).

[0061] Furthermore, when terminal 200 changes from the second RO region to the first RO region in retransmission of the second signal, control unit 220 of terminal 200 may control to repeatedly transmit the second signal (Repetition Transmission). Note that the number of repeated transmissions is determined by, for example, SSB-RSRP (Synchronization Signal Block-Reference Signal Received Power). Furthermore, in the determination of step S52, control unit 220 of terminal 200 may determine whether to change the region, taking into account whether repeated transmission is possible.

[0062] As described above, in the second embodiment, terminal 200 can determine whether to change the selected resource (RO) when retransmitting the second signal. Furthermore, for example, when terminal 200 changes to the resource of the first RO region, terminal 200 can perform power control of the second signal using the first method. Furthermore, for example, when terminal 200 changes to the resource of the second RO region, terminal 200 can perform power control of the second signal using the second method. Therefore, for example, terminal 200 can increase the probability of successful retransmission of the second signal. Furthermore, when transmitting the second signal using the resource (RO) on the UL subband, terminal 200 can set the maximum transmission power to a value that takes into consideration the impact on other terminals. Furthermore, for example, even if terminal 200 fails to transmit the second signal using the resource (RO) on the UL subband even at the maximum transmission power, terminal 200 can transmit the second signal using the resource of the second RO region. Therefore, it is possible to control the transmission of a signal related to a random access procedure of terminal 200 for which SBFD is configured, taking into consideration the impact on other terminals. Embodiment 3

[0063] In the first embodiment, an example has been described in which terminal 200 controls the second signal using a first method when transmitting the second signal using resources on the UL subband, and controls the second signal using a second method when transmitting the second signal using resources other than the UL subband. In the second embodiment, an example of control when terminal 200 retransmits the second signal has been described. In the third embodiment, an example of power control, which is one type of control of the second signal when transmitting or retransmitting the second signal, will be described. Note that in the third embodiment, the wireless communication system, base station, and terminal are the same as those in the first embodiment, and therefore description thereof will be omitted.

[0064] When using resources in the first RO region, the control unit 220 of the terminal 200 determines power control in accordance with (Equation 1) and / or (Equation 2).

[0065] (Formula 1)

[0066] (Formula 2)

[0067] Furthermore, when using resources in the second RO region, the control unit 220 of the terminal 200 determines power control in accordance with (Equation 3).

[0068] (Formula 3)

[0069] Here, each parameter in (Equation 1), (Equation 2), and (Equation 3) will be explained. ＰＲＡＣＨ，ｆ，ｃ (i) denotes the transmit power on the active uplink BWP b of carrier f of serving cell c, for example, based on the downlink reference signal of serving cell c at transmission opportunity i. ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ (i) denotes the maximum transmit power of the second signal transmitted on the resource (RO) on the UL subband, for example. P ＰＲＡＣＨ，ｔａｒｇｅｔ，ｆ，ｃ indicates, for example, the target received power of the PRACH. ｂ，ｆ，ｃ indicates, for example, a path loss. The path loss may be based on an SSB or a downlink reference signal. ＣＭＡＸ，ｆ，ｃ (i) may indicate the maximum transmission power of the second signal transmitted in resources other than the UL subband (RO). ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ (i) and PＣＭＡＸ，ｆ，ｃ (i) may be set to the same value or may be set to a different value. ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ (i) and P ＣＭＡＸ，ｆ，ｃ (i) may be set using the same information or different information.

[0070] Here, min{X1, Y1} may be a function that outputs the smallest value among X1 and Y1, or min{X1, Y1, Z1} may be a function that outputs the smallest value among X1, Y1, and Z1.

[0071] In addition, P ＰＲＡＣＨ，ｔａｒｇｅｔ，ｆ，ｃ is determined based on the following (Equation 4), for example.

[0072] (Formula 4)

[0073] A1 is, for example, preambleReceivedTargetPower. For example, it is a value that can be set between -202 dB and -60 dB in 2 dB intervals. A2 is DELTA_PREAMBLE, and can take the values ​​shown in FIG. 9, for example. A3 is, for example, PREAMBLE_POWER_RAMPING_STEP. The maximum value of PREAMBLE_POWER_RAMPING_COUNTER is set, for example, by preambleTransMax.

[0074] 9A and 9B are diagrams showing examples of values ​​of the delta preamble (DELTA_PREAMBLE). Fig. 9A is a diagram showing examples of values ​​indicating the delta preamble value in the case of the long preamble format. Fig. 9B is a diagram showing examples of values ​​indicating the delta preamble value in the case of the short preamble format.

[0075] 9A and 9B, the value of the delta preamble may be determined depending on the preamble format, and μ is a parameter used to set the subcarrier spacing.

[0076] Here, three examples of a method for controlling transmission power for resources in the first RO region will be described. Note that the maximum transmission power included in the first method is an example of the first maximum transmission power, and the ramping counter included in the first method is an example of the first ramping counter. Note that the maximum transmission power included in the second method is an example of the second maximum transmission power, and the ramping counter included in the second method is an example of the second ramping counter.

[0077] The first example is P ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ The value of (i) is P ＣＭＡＸ，ｆ，ｃ (i) The following is an example. For example, P ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ The value of (i) and P ＣＭＡＸ，ｆ，ｃ (i) and (ii) may be set using separate information elements, or P ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ The value of (i) is P ＣＭＡＸ，ｆ，ｃ It may be obtained by multiplying (i) by a predetermined value (for example, a value selected between 0.5 and 1.0). ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ The value of (i) is P ＣＭＡＸ，ｆ，ｃ The predetermined value may be calculated by subtracting a predetermined value (e.g., a value selected to be equal to or greater than 0 dB) from (i). Note that the predetermined value may be notified from the base station 100 to the terminal 200, or may be determined according to the location of the resource (RO).

[0078] In the first example, P ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ The value of (i) may be changed. This case will be described using FIG. 10. FIG. 10 is a diagram showing an example of an RO set in terminal 200 in which SBFD is set. For example, as shown in FIG. 10, it is assumed that regions RO3-1, RO3-2, RO3-3, and RO3-4 are configured on the UL subband configured with frequency F3 in section S4. It is assumed that region RO3-2 and region RO3-4 are separated from the DL region by the same distance in the frequency domain.

[0079] In this case, for example, the control unit 220 of the terminal 200 determines the P ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ(i) is the closest of the four regions RO3-1, RO3-2, RO3-3, and RO3-4 to the DL region in the frequency domain, so it is used as the P of the other three regions RO3-2, RO3-3, and RO3-4. ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ (i) The following is true. For example, the control unit 220 of the terminal 200 determines the P ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ (i) is P of the region RO3-1 ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ (i) or more, and P of region RO3-3 ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ (i) The following is true: For example, the control unit 220 of the terminal 200 determines the P ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ (i) is the farthest from the DL region among the four regions RO3-1, RO3-2, RO3-3, and RO3-4, so the P of the other three regions RO3-2, RO3-3, and RO3-4 ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ (i) Ensure that it is equal to or greater than this.

[0080] The control unit 220 of the terminal 200 associates each of the regions RO3-1, RO3-2, RO3-3, and RO3-4 with a frequency identifier, and calculates the P ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ For example, when the frequency identifier of the region RO3-1 is set to f1, the control unit 220 of the terminal 200 may obtain P ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ (i) to P ＣＭＡＸ，ｆ，ｃ (i)-K1. For example, when the frequency identifier of the region RO3-2 is set to f2, the control unit 220 of the terminal 200 sets P ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ (i) to P ＣＭＡＸ，ｆ，ｃ (i)-K2. For example, when the frequency identifier of the region RO3-3 is set to f3, the control unit 220 of the terminal 200 sets P ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ (i) to P ＣＭＡＸ，ｆ，ｃ For example, when the frequency identifier of the region RO3-2 is set to f4, the control unit 220 of the terminal 200 sets P ＣＭＡＸ，ＳＢＦＤ，ｆ，ｃ (i) to P ＣＭＡＸ，ｆ，ｃ (i)-K2 In the frequency domain, the maximum transmit power of each RO may be derived according to its distance from the DL domain, where the distance may be calculated in terms of the number of resource blocks.

[0081] Note that K3 may take the value 0. In this way, the set value of the maximum transmission power can be changed according to the location of the resource (RO), and the maximum transmission power can be lowered in areas where there is a high possibility of an impact on other terminals.

[0082] Next, a second example of a method for controlling transmission power for resources in the first RO region will be described.

[0083] The second example is an example in which the value of A3 in Equation 4 is made different between the method of controlling transmission power for resources of the first RO area (first method) and the method of controlling transmission power for resources of the second RO area (second method).

[0084] For example, the control unit 220 of the terminal 200 sets PREAMBLE_POWER_RAMPING_STEP for the first method, and also sets PREAMBLE_POWER_RAMPING_STEP for the second method. In short, the control unit 220 of the terminal 200 separately sets PREAMBLE_POWER_RAMPING_STEP for the first method and PREAMBLE_POWER_RAMPING_STEP for the second method.

[0085] In addition, for example, in the first method, the values ​​that PREAMBLE_POWER_RAMPING_STEP can take are set in 5 dB increments, such that it can be selected from 0 dB, 5 dB, 10 dB, and 15 dB, while in the second method, the values ​​that PREAMBLE_POWER_RAMPING_STEP can take are set in 3 dB increments, such that it can be selected from 0 dB, 3 dB, 6 dB, and 9 dB.

[0086] Furthermore, the control unit 220 of the terminal 200 may obtain the PREAMBLE_POWER_RAMPING_STEP for the first method from the PREAMBLE_POWER_RAMPING_STEP for the second method. For example, the control unit 220 of the terminal 200 may set the PREAMBLE_POWER_RAMPING_STEP for the first method to a value obtained by adding a predetermined value (for example, 10 dB) to the PREAMBLE_POWER_RAMPING_STEP for the second method.

[0087] By doing as described above, the control unit 220 of the terminal 200 can adjust PREAMBLE_POWER_RAMPING_STEP for the first method, and therefore can take into consideration the impact on other terminals when using the first method.

[0088] Next, a third example of a method for controlling transmission power for resources in the first RO region will be described.

[0089] The third example is an example in which PREAMBLE_POWER_RAMPING_COUNTER in Equation 4 is made different between the control method of transmission power for resources of the first RO region (first method) and the control method of transmission power for resources of the second RO region (second method).

[0090] For example, in the first method, PREAMBLE_POWER_RAMPING_COUNTER is set to PREAMBLE_POWER_RAMPING_COUNTER and SBFD_PREAMBLE_POWER_RAMPING_COUNTER. Also, in the first method, it is the same as described in Equation 4.

[0091] In this manner, when the first method is used, failure of transmission of the second signal in the UL subband is taken into consideration, while when the second method is used, failure of transmission of the second signal in the UL subband does not need to be taken into consideration. As a result, for example, when the RO region is changed from the first to the second RO region, the transmission power of the second signal does not need to be increased more than necessary. For example, when the terminal 200 fails to transmit the second signal due to interference, the terminal 200 may not need to increase the transmission power of the second signal. Therefore, when the region in which the second signal is transmitted is changed from the first RO region to the second RO region, the terminal 200 does not need to increase the transmission power of the second signal more than necessary. Therefore, the terminal 200 can reduce interference and can reduce power consumption of the terminal 200.

[0092] As described above, in the third embodiment, the terminal 200 can perform different power control depending on the RO region in which the second signal is transmitted. Therefore, the terminal 200 and / or the base station 100 can control transmission of a signal related to the random access procedure of the terminal 200 for which SBFD is configured, taking into consideration the impact on other terminals.

[0093] The contents described in the first to third embodiments can be combined as appropriate within the scope of no contradiction. For example, the transmission power when switching the RO region described in the second embodiment can be set based on the formula described in the third embodiment. Hardware configuration of each device in each embodiment

[0094] The hardware configuration of each device in the wireless communication system of each embodiment will be described with reference to FIGS.

[0095] Fig. 11 is a diagram showing an example of the hardware configuration of base station 100. As shown in Fig. 11, base station 100 has, as hardware components, for example, 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 so as to enable input and output of various signals and data signals. The memory 350 includes at least one of a RAM (Random Access Memory) such as an SDRAM (Synchronous Dynamic Random Access Memory), a ROM (Read Only Memory), and a flash memory, and stores programs, control information, and data signals.

[0096] The correspondence between the functional configuration of the base station 100 shown in Fig. 2 and the hardware configuration of the base station 100 shown in Fig. 11 will be described. The transmitter 111 and receiver 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, a digital electronic circuit (not shown), etc. Examples of the digital electronic circuit include an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), and an LSI (Large Scale Integration). The storage unit 130 is realized by, for example, the memory 350. The communication unit 140 is realized by, for example, the network IF 360 .

[0097] It should be noted that base station 100 may generate a plurality of data signals to be transmitted in a plurality of subbands, and the filters that generate these signals may be configured independently for each subband.

[0098] Fig. 12 is a diagram showing an example of the hardware configuration of terminal 200. As shown in Fig. 12, terminal 200 has, as hardware components, an RF circuit 420 including, for example, an antenna 410, a CPU 430, a DSP 440, and a memory 450. Memory 450 includes at least one of a RAM such as an SDRAM, a ROM, and a flash memory, and stores programs, control information, and data signals.

[0099] The correspondence between the functional configuration of the terminal 200 shown in Fig. 3 and the hardware configuration of the terminal 200 shown in Fig. 12 will be described. The transmitter 211 and receiver 212 (or 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, a digital electronic circuit (not shown), etc. Examples of the digital electronic circuit include an ASIC, an FPGA, and an LSI. The storage unit 230 is realized by, for example, the memory 450.

[0100] The embodiments may be combined as appropriate within a range that does not cause any contradiction.

[0101] In each embodiment, examples of a base station and a terminal are described, but the disclosed technology is not limited to this and can be applied to various devices such as electronic devices mounted on automobiles, trains, airplanes, artificial satellites, etc., electronic devices transported by drones, etc., robots, AV equipment, home appliances, office equipment, vending machines, and other household equipment.

[0102] Furthermore, although the embodiments have been described using fifth-generation mobile communications as an example, the application of the disclosed technology is not limited to this. For example, the disclosed technology may be applied to mobile communications of different generations, such as sixth and seventh generations.

[0103] 1 Wireless communication system 100 Base station C10 Cell 110 Wireless communication unit 111 Transmitter 112 Receiver 120 Control unit 130 Memory unit 140 Communication unit 200 200A 200B Terminal 210 Communication unit 211 Transmitter 212 Receiver 220 Control unit 230 Memory unit 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 including first information for setting resources for transmitting a second signal, which is a signal of a random access procedure, the first information being for setting one or more first resources of a first group set on an uplink area set on a downlink section or a flexible section within a plurality of sections, and one or more second resources of a second group set on an uplink section or a flexible section within the plurality of sections; a control unit that selects a resource for transmitting the second signal from the one or more first resources and the one or more second resources, and controls the second signal using a first method if the selected resource is included in the one or more first resources, and controls the second signal using a second method if the selected resource is included in the one or more second resources; and a transmitting unit that transmits the second signal using the selected resource.

2. The terminal according to claim 1, wherein the receiving unit receives second information that sets the uplink area on the downlink section or the flexible section, and third information that is information that sets the uplink section and the downlink section of the multiple sections.

3. The terminal according to claim 1, wherein, when transmission of the second signal fails and the second signal is to be retransmitted, the control unit determines whether to transmit the second signal using resources in a group different from the selected resources.

4. The terminal according to claim 3, wherein the control unit determines that transmission of the second signal has failed if a response signal is not received after a predetermined time has elapsed since transmitting the second signal, and the control unit determines whether to transmit using resources of a group different from the selected resources depending on the number of transmission failures of the second signal and the transmission power of the second signal that has failed to be transmitted.

5. The terminal according to claim 3, wherein, when the control unit determines to transmit using resources of a group different from the selected resources, the control unit determines the transmission power of the second signal to be retransmitted in accordance with parameters used for the transmission power of the failed second signal.

6. The terminal according to claim 3, wherein, when the control unit determines to transmit using resources of a group different from the selected resources, the control unit determines the transmission power of the second signal to be retransmitted without using parameters used for the transmission power of the failed second signal.

7. The terminal according to claim 1, wherein the first method is a method of controlling the transmission power of the second signal, which can be controlled using a first ramping counter and a first maximum transmission power, when the one or more first resources are used; and the second method is a method of controlling the transmission power of the second signal, which can be controlled using a second ramping counter and a second maximum transmission power, when the one or more first resources are used.

8. The terminal according to claim 7, wherein the first maximum transmission power and the second maximum transmission power are set to be different from each other.

9. The terminal of claim 7, wherein the first ramping counter and the second ramping counter are set differently.

10. A base station comprising: a transmitter that transmits a first signal including first information for setting resources for transmitting a second signal, which is a signal of a random access procedure, the first information being for setting one or more first resources of a first group set on an uplink area set on a downlink section or a flexible section within a plurality of sections, and one or more second resources of a second group set on an uplink section or a flexible section within the plurality of sections; and a receiver that receives the second signal, the receiver being controlled using a first method when a resource selected from the one or more first resources and the one or more second resources is included in the one or more first resources, and being controlled using a second method when the selected resource is included in the one or more second resources.

11. A wireless communication system comprising: a base station that transmits a first signal, the first signal including first information for setting resources for transmitting a second signal that is a signal of a random access procedure, the first information being for setting one or more first resources of a first group set on an uplink region set on a downlink section or a flexible section within a plurality of sections, and one or more second resources of a second group set on an uplink section or a flexible section within the plurality of sections; and a terminal that receives the first signal, selects a resource for transmitting the second signal from the one or more first resources and the one or more second resources, and controls the second signal using a first method if the selected resource is included in the one or more first resources, and controls the second signal using a second method if the selected resource is included in the one or more second resources, and transmits the second signal using the selected resource.

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