Terminal device, base station device, and wireless communication system

Abstract

The present invention includes: a reception unit that receives first information relating to the configuration of uplink sections, downlink sections, and flexible sections in a plurality of sections, second information relating to the configuration of an SBFD that configures an uplink section in at least a portion of the downlink sections and the flexible section configured by the first information, and third information which relates to RO; a control unit that, in accordance with the first information, the second information, and the third information, identifies, as the RO assigned to a host device, an RO for which an SSB associated with each RO by the host device and the SSB associated with each RO by another terminal device are not different from each other, from among the ROs configured respectively in the uplink sections corresponding to the first information and the uplink sections corresponding to the second information; and a transmission unit that transmits a PRACH to a base station device via the identified RO.

Description

Terminal device, base station device, and wireless communication system

[0001] The present disclosure relates to a terminal device, a base station device, 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 this trend is expected to continue. In addition to traffic from mobile devices, IoT (Internet of Things) services (e.g., transportation systems, smart meters, and monitoring systems for devices) are also being developed. Therefore, these networks are being required to support services with diverse requirements.

[0003] In order to accommodate such diverse services, communication standards for fifth-generation mobile communications (5G or NR (New Radio)) (for example, Non-Patent Documents 1 to 14) have been developed that assume support for many use cases classified as, for example, eMBB (Enhanced Mobile Broadband), Massive MTC (Machine Type Communications), and URLLC (Ultra-Reliable and Low Latency Communications).

[0004] The 3rd Generation Partnership Project (3GPP), an international standardization project, is currently continuously studying and standardizing technologies to extend the above communication standards.

[0005] For example, a 3GPP working group is considering the introduction of the SBFD (Subband Full Duplex) technology (Non-Patent Document 15), which aims to improve uplink latency and expand coverage by configuring uplink resources on downlink symbols and / or flexible symbols.

[0006] 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 V18.0.0

[0007] In the wireless communication system described above, for example, terminal devices that support SBFD and terminal devices that do not support SBFD may coexist.

[0008] However, for example, an operation method when a terminal device that supports SBFD and a terminal device that does not support SBFD each receive information corresponding to SBFD is still under consideration and has not yet been determined. Therefore, in the wireless communication system described above, for example, the mapping result between RO (Ratch Occasion) and SSB (Synchronization Signal Block) may differ between a terminal device that supports SBFD and a terminal device that does not support SBFD. Therefore, in the wireless communication system described above, for example, a PRACH (Physical Random Access Channel) may be transmitted to a base station device from multiple terminal devices that have different optimal beams for the same RO.

[0009] Therefore, one disclosure provides a terminal device, a base station device, and a wireless communication system that can prevent PRACH transmission from multiple terminal devices that have different optimal beams in the same RO.

[0010] a receiver that receives first information regarding configuration of an uplink segment, a downlink segment, and a flexible segment in a plurality of segments, second information regarding configuration of a Subband Non-Overlapping Full Duplex (SBFD) that configures an uplink segment in at least a portion of the downlink segment and the flexible segment configured by the first information, and third information that is information regarding an RO (Rach Occasion); a controller that, according to the first information, the second information, and the third information, identifies, as the RO allocated to the terminal device, an RO that is configured in the uplink segment corresponding to the first information and the uplink segment corresponding to the second information, and in which an SSB (Synchronization Signal Block) associated with each RO by the terminal device is not different from an SSB associated with each RO by another terminal device; and a controller that transmits a Physical Random Access Control (PRACH) via the identified RO. and a transmitting unit that transmits the access channel to the base station device.

[0011] One disclosure makes it possible to prevent PRACH transmission from multiple terminal devices with different optimal beams in the same RO.

[0012] FIG. 1 is a diagram illustrating an example of the configuration of a wireless communication system 10. FIG. 2 is a diagram illustrating an example of the configuration of a terminal device 100. FIG. 3 is a diagram illustrating an example of the configuration of a base station device 200. FIG. 4 is a diagram illustrating a specific example of RO. FIG. 5 is a diagram illustrating a specific example of RO. FIG. 6 is a diagram illustrating a specific example of RO. FIG. 7 is a diagram illustrating a specific example of RO. FIG. 8 is a diagram illustrating an example of a sequence of a mapping control process in the first embodiment. FIG. 9 is a diagram illustrating a specific example of RO. FIG. 10 is a diagram illustrating an example of a sequence in the second embodiment. FIG. 11 is a diagram illustrating an example of a sequence of a mapping control process in the second embodiment. FIG. 12 is a diagram illustrating a specific example of RO. FIG. 13 is a diagram illustrating a specific example of RO. FIG. 14 is a diagram illustrating a specific example of RO. FIG. 15 is a diagram illustrating a specific example of RO.

[0013] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. However, such descriptions should not be interpreted in a limiting sense, and do not limit the subject matter described in the claims. Furthermore, various changes, substitutions, and modifications can be made without departing from the spirit and scope of the present disclosure. Furthermore, different embodiments can be combined as appropriate.

[0014] [First embodiment] (Regarding wireless communication system 10) Fig. 1 is a diagram showing an example of the configuration of a wireless communication system 10. The wireless communication system 10 includes, for example, a terminal device 100a, a terminal device 100b, and a base station device 200. Hereinafter, the terminal device 100a and the terminal device 100b will also be collectively referred to simply as terminal device 100. Hereinafter, the terminal device 100a will also be referred to as a first terminal, and the terminal device 100b will also be referred to as a second terminal.

[0015] The terminal device 100a is, for example, a communication device that is wirelessly connected to the base station device 200 and transmits and receives data. Specifically, the terminal device 100a is, for example, a smartphone or a tablet terminal. Furthermore, the terminal device 100a is, for example, a terminal device 100 that supports SBFD.

[0016] The terminal device 100b is, for example, a communication device that is wirelessly connected to the base station device 200 and transmits and receives data. Specifically, the terminal device 100b is, for example, a smartphone or a tablet terminal. Furthermore, the terminal device 100b is, for example, a terminal device 100 that does not support SBFD.

[0017] The base station device 200 is, for example, a device that is wirelessly connected to the terminal device 100 and transmits and receives data. Specifically, the base station device 200 is, for example, an eNodeB or a gNodeB. The base station device 200 supports, for example, various communication generations (for example, 4G, 5G, or Beyond 5G). Furthermore, the base station device 200 may be, for example, configured as a single device, or may be configured as a plurality of devices such as a CU (Central Unit) and a DU (Distributed Unit).

[0018] 2 is a diagram showing an example of the configuration of the terminal device 100. The terminal device 100 includes, for example, a CPU (Central Processing Unit) 110, a storage 120, a memory 130, and a wireless communication circuit 150.

[0019] The storage 120 is, for example, an auxiliary storage device that stores programs and data, and is a flash memory, a hard disk drive (HDD), a solid state drive (SSD), etc. The storage 120 stores, for example, a terminal communication program 121 and a mapping control program 122.

[0020] The memory 130 is, for example, an area into which programs stored in the storage 120 are loaded. Note that the memory 130 may also be used, for example, as an area into which programs store data.

[0021] The wireless communication circuit 150 is, for example, a circuit that performs wireless communication with the base station device 200. The wireless communication circuit 150 has, for example, an antenna 151. The antenna 151 includes, for example, a directional antenna that can control the direction of transmission and reception of radio waves. The wireless communication circuit 150 is also, for example, capable of changing transmission power.

[0022] The CPU 110 is a processor that, for example, loads a program stored in the storage 120 into the memory 130 and executes it to configure each unit and realize each process.

[0023] The CPU 110 executes, for example, the terminal communication program 121 to configure a receiving unit and a transmitting unit and perform terminal communication processing. The terminal communication processing is processing for establishing a wireless connection with the base station device 200 and performing wireless communication.

[0024] The CPU 110 executes, for example, the mapping control program 122 to construct a mapping control unit (hereinafter also simply referred to as a control unit) and perform mapping control processing. The mapping control processing is, for example, processing to map (associate) RO (Ratch Occasion) and SSB (Synchronization Signal Block). Specifically, the mapping control is processing to map RO and SSB when SBFD (Subband non-overlapping Full Duplex) is performed.

[0025] 3 is a diagram showing an example of the configuration of the base station device 200. The base station device 200 includes a CPU 210, a storage 220, a memory 230, and a wireless communication circuit 250, for example.

[0026] The storage 220 is, for example, an auxiliary storage device that stores programs and data, and is a flash memory, HDD, SSD, etc. The storage 220 stores, for example, a base station communication program 221.

[0027] The memory 230 is, for example, an area into which programs stored in the storage 220 are loaded. Note that the memory 230 may also be used, for example, as an area into which programs store data.

[0028] The wireless communication circuit 250 is, for example, a device that performs wireless communication with the terminal device 100. The wireless communication circuit 250 has, for example, an antenna 251. The antenna 251 includes, for example, a directional antenna that can control the direction of transmission and reception of radio waves.

[0029] The CPU 210 is a processor that, for example, loads a program stored in the storage 220 into the memory 230 and executes it to configure each unit and realize each process.

[0030] The CPU 210 executes, for example, the base station communication program 221 to configure a receiving unit and a transmitting unit and perform base station communication processing. The base station communication processing is processing for performing wireless communication with the terminal device 100. Specifically, in the base station communication processing, the base station device 200 establishes a wireless connection with the terminal device 100, transmits data to the terminal device 100, and receives data from the terminal device 100.

[0031] (Specific Example of RO) Next, specific examples of RO will be described. Figures 4 to 7, 9 to 10, and 12 to 14 are diagrams for explaining specific examples of RO. Note that in Figures 4 to 7, 9 to 10, and 12 to 14, the horizontal axis corresponds to time and the vertical axis corresponds to frequency.

[0032] As shown in FIG. 4 , the base station device 200 broadcasts information (hereinafter also referred to as first information) instructing the use of, for example, each of sections S1, S2, S3, and S4 as DL (Down Link) resources (hereinafter also referred to as DL resources or simply DL) and section S5 as UL (Up Link) resources (hereinafter also referred to as UL resources or simply UL). Note that the first information may specify at least some sections as flexible sections. In short, the first information is information indicating, for example, whether each of a plurality of sections is a UL resource (UL section), a DL resource (DL section), or a flexible resource (flexible section).

[0033] Furthermore, as shown in FIG. 5 , the base station device 200 broadcasts information (hereinafter also referred to as second information) instructing the use of, for example, some (at least some) of the DL resources in each of sections S1, S2, S3, and S4 as UL resources. That is, the second information is, for example, information related to SBFD configuration, where each of sections S1 to S4 is, for example, an SBFD section, and section S5 is, for example, a non-SBFD section. Note that the second information may also be described as, for example, information instructing the use of at least some of the flexible resources as UL resources. Furthermore, the second information is, for example, information instructing the use of at least some of the DL resources and flexible resources as UL resources.

[0034] Furthermore, the base station device 200 broadcasts, for example, information related to ROs (hereinafter also referred to as third information). The third information is, for example, information including at least a PRACH configuration index, the number of FDMs (Frequency Division Multiplexes), and the number of SSBs allocated per RO. The number of FDMs is the number of ROs allocated at the same time. That is, the third information is, for example, information related to the configuration of the PRACH. Below, a case will be described in which the third information for a terminal device 100 that supports SBFD (for example, terminal device 100a) and the third information for a terminal device 100 that does not support SBFD (for example, terminal device 100b) are the same information (common information).

[0035] Here, the first information is, for example, information that can be recognized by each of the terminal device 100a and the terminal device 100b. Therefore, for example, when the terminal device 100a receives the first information and the second information broadcast from the base station device 200, the terminal device 100a can recognize the RO set in the UL resources in the intervals S1 to S4 and the RO set in the interval L5.

[0036] Therefore, in this case, as shown in Fig. 6, the terminal device 100a identifies, for example, the RO set in the UL resource in section S4 as a valid RO (i.e., a valid RO), sets the index of the RO to #0, and maps it to SSB #0. Also, in this case, as shown in Fig. 6, the terminal device 100a identifies, for example, the RO set in section S5 as a valid RO, sets the index of the RO to "#1," and maps it to "SSB #1."

[0037] In contrast, the second information is, for example, information that can be recognized by the terminal device 100a but cannot be recognized by the terminal device 100b (information whose syntax cannot be analyzed by the terminal device 100b due to a difference in the supported versions of the programs). Therefore, even if the terminal device 100a receives the first information and the second information broadcast from the base station device 200, the terminal device 100a cannot recognize the RO set in the UL resource in the intervals S1 to S4.

[0038] Therefore, in this case, as shown in FIG. 7, the terminal device 100a identifies the RO set in the section S5 as a valid RO, assigns the index of the RO to #0, and associates the RO with SSB #0.

[0039] 7, in the RO set in section S5, for example, the terminal device 100a performs mapping with SSB #0, and the terminal device 100b performs mapping with SSB #1. Therefore, in the RO set in section S5, for example, there is a possibility that PRACHs will be transmitted from a plurality of terminal devices 100 with different optimal beams.

[0040] Therefore, in this case, the base station device 200 may need to perform post-processing in response to reception of the PRACH transmitted from each terminal device 100, or may not be able to properly process the PRACH transmitted from each terminal device 100.

[0041] (Mapping control process in the first embodiment) Next, the mapping control process in the first embodiment will be described. Fig. 8 is a diagram showing an example of a sequence of the mapping control process in the first embodiment. Fig. 9 is a diagram explaining the mapping control process in the first embodiment. Specifically, Fig. 8 is a diagram showing an example of a sequence of the mapping control process when SBFD is performed between the base station device 200 and the terminal device 100a.

[0042] The terminal device 100a measures, for example, the RSRP (Reference Signal Received Power) of one or more SSBs broadcast from the base station device 200 (S11).

[0043] Then, the terminal device 100a performs a process of selecting an SSB with the highest measured RSRP from one or more SSBs (hereinafter also referred to as an SSB selection process) (S12).

[0044] Next, the terminal device 100a receives, for example, notification information broadcast from the base station device 200 (S13). The notification information is, for example, SIB1 (System Information Block Type 1). Furthermore, the notification information is, for example, a signal of the RRC (Radio Resource Control) layer. Specifically, the notification information may include, for example, first information, second information, and third information. Note that the first information, second information, and third information may each include, for example, different notification information, or may be included in different signals.

[0045] Then, the terminal device 100a performs, for example, a process of determining the position (time position and frequency position) of each RO (hereinafter also referred to as RO position determination process) (S14).

[0046] Specifically, the terminal device 100a determines the time position of each RO by, for example, referring to the PRACH Configuration index included in the third information. Also, the terminal device 100a determines the frequency position of each RO by, for example, referring to the number of FDMs included in the third information.

[0047] Next, the terminal device 100a performs the same process (hereinafter also referred to as the first RO identification process) as the process performed when a terminal device 100 that does not support SBFD (i.e., a terminal device 100 that cannot recognize the second information) identifies a valid RO (a valid RO for a terminal device 100 that does not support SBFD) for the RO whose position was determined in S14 (S15).

[0048] Specifically, the terminal device 100a, for example, refers to the first information and identifies the RO set in the UL resources in the non-SBFD section (section S5 in the example described in FIG. 4 etc.) among each section as a valid RO for the terminal device 100 that does not support SBFD.

[0049] Then, the terminal device 100a, for example, refers to the second information and performs a process (hereinafter also referred to as a second RO determination process) to identify the RO set in the SBFD section (section S1 to section S4 in the example described in FIG. 4 etc.) among each section and the RO set in the non-SBFD section (section S5 in the example described in FIG. 4 etc.) among each section as valid RO candidates (hereinafter also simply referred to as candidates) for the terminal device 100a (the terminal device 100 corresponding to SBFD) (S16).

[0050] Furthermore, the terminal device 100a performs a process (hereinafter also referred to as a third RO identification process) to identify, as a valid RO for the terminal device 100a, from among the candidates identified in S16, an RO other than an RO having the same time and frequency as the RO identified in S15 as a valid RO for the terminal device 100 that does not support SBFD (S17).

[0051] Thereafter, the terminal device 100a performs a process of mapping each RO identified as a valid RO for the terminal device 100a in S17 to each SSB (hereinafter also referred to as a mapping process) (S18).

[0052] Specifically, the terminal device 100a allocates SSBs to each RO at the same time along the frequency direction by, for example, referring to the number of SSBs allocated per RO included in the third information. Then, for example, when the allocation of SSBs to each RO at the same time is completed, the terminal device 100a allocates SSBs to each RO at the next time.

[0053] Then, the terminal device 100a transmits a PRACH to the base station device 200, for example, in the RO corresponding to the SSB selected in S12 (S19).

[0054] Specifically, the terminal device 100a transmits the PRACH by using a preamble randomly selected from the preambles corresponding to the SSB selected in S12, for example.

[0055] In this way, the terminal device 100a in this embodiment receives, for example, first information regarding the configuration of uplink segments, downlink segments, and flexible segments in multiple segments, second information regarding the configuration of SBFD that configures uplink segments in at least some of the downlink segments and flexible segments configured in the first information, and third information that is information regarding ROs. Furthermore, the terminal device 100a in this embodiment, for example, in accordance with the first information, second information, and third information, identifies, as ROs assigned to itself, ROs configured in the uplink segments corresponding to the first information and the uplink segments corresponding to the second information, in which the SSBs associated with each RO by the terminal device 100a are the same as the SSBs associated with each RO by other terminal devices. Furthermore, the terminal device 100a in this embodiment transmits a PRACH to the base station device 200 via the identified ROs, for example.

[0056] Specifically, the terminal device 100a in this embodiment identifies, for example, an RO set in the uplink segment corresponding to the second information as an RO assigned to the terminal device 100a.

[0057] More specifically, in this embodiment, the terminal device 100a identifies, for example, among the ROs set in each of the uplink sections corresponding to the first information and the second information, ROs other than the RO assigned to the terminal device 100b as ROs assigned to the terminal device 100a itself.

[0058] That is, as shown in FIG. 9, the terminal device 100a in this embodiment does not identify, as a valid RO, an RO that a terminal device 100 that does not support SBFD (for example, the terminal device 100b) may identify as a valid RO corresponding to the terminal device itself.

[0059] As a result, the base station device 200 in this embodiment can prevent, for example, PRACHs from being transmitted from multiple terminal devices 100 that have different optimal beams. Therefore, the base station device 200 does not need to perform post-processing associated with receiving the PRACHs transmitted from each terminal device 100, for example, and can prevent the occurrence of a situation in which each PRACH cannot be received.

[0060] As shown in Figure 10, even if, for example, the third information for terminal device 100a and the third information for terminal device 100b are different information and the RO in which terminal device 100a performs mapping and the RO in which terminal device 100b performs mapping are different (different in the frequency direction), PRACH may be transmitted from multiple terminal devices 100 with different optimal beams at the same time.

[0061] Therefore, in S17, the terminal device 100a may identify, for example, from among the candidates identified in S16, an RO other than an RO that has the same time as the RO identified in S15 as a valid RO for the terminal device 100 that does not support SBFD, as a valid RO for the terminal device 100a itself.

[0062] [Second embodiment] (Mapping control process in the second embodiment) Next, the mapping control process in the second embodiment will be described. Fig. 11 is a diagram showing an example of the sequence of the mapping control process in the second embodiment. Figs. 12 to 14 are diagrams for explaining the mapping control process in the first embodiment.

[0063] The terminal device 100a measures, for example, the RSRP of one or more SSBs broadcast from the base station device 200 (S21).

[0064] Then, the terminal device 100a performs a process (SSB selection process) of selecting an SSB with the highest measured RSRP from one or more SSBs (S22).

[0065] Next, the terminal device 100a receives, for example, notification information broadcasted from the base station device 200 (S23).

[0066] Then, the terminal device 100a performs, for example, a process of determining the position (time position and frequency position) of each RO (RO position determination process) (S24).

[0067] Next, the terminal device 100a performs the same process (first RO identification process) as that performed by a terminal device 100 that does not support SBFD (i.e., a terminal device 100 that cannot recognize the second information) when identifying a valid RO for itself (a valid RO for a terminal device 100 that does not support SBFD) for the RO whose position was determined in S24 (S25).

[0068] Then, the terminal device 100a, for example, refers to the second information and performs a process (hereinafter also referred to as a fourth RO determination process) to identify the RO set in the SBFD section (section S1 to section S4 in the example described in FIG. 4, etc.) among each section and the RO set in the non-SBFD section (section S5 in the example described in FIG. 4, etc.) among each section as valid ROs for its own device (terminal device 100 corresponding to SBFD) (S26).

[0069] Next, a process of mapping each RO identified as a valid RO in S25 to each SSB (hereinafter also referred to as a first mapping process) is performed (S27).

[0070] That is, in S27, the terminal device 100a performs the same processing as that performed by a terminal device 100 that does not support SBFD (i.e., a terminal device 100 that cannot recognize the second information) when mapping each RO identified as a valid RO for the terminal device 100 that does not support SBFD to each SSB.

[0071] Then, for example, the terminal device 100a identifies an RO (hereinafter also referred to as a target RO) that has the same time and frequency as the RO identified as a valid RO for the terminal device 100 that does not support SBFD in S25, from among the valid ROs for the terminal device 100a identified in S26. That is, for example, the terminal device 100a identifies, as the target RO, an RO that is to be assigned to a terminal device 100 that does not support SBFD (for example, the terminal device 100b) from among the valid ROs for the terminal device 100a identified in S26. Then, for example, the terminal device 100a performs a process of mapping each identified RO to each SSB (hereinafter also referred to as a second mapping process) (S28).

[0072] Specifically, as shown in Fig. 12, for example, the terminal device 100a determines the index of the SSB to be assigned to the target RO to be the same as the index of the SSB assigned to the target RO in S27 (hereinafter also referred to as the target SSB). Then, as shown in Fig. 13, for example, the terminal device 100a maps the SSB corresponding to the determined index to the target RO.

[0073] Furthermore, as shown in Figure 14, the terminal device 100a performs a process (hereinafter also referred to as a third mapping process) of mapping each RO other than the target RO mapped in S28 (each RO not mapped in S28) among the ROs identified in S26 to each SSB (S29).

[0074] Then, the terminal device 100a transmits a PRACH to the base station device 200, for example, in the RO corresponding to the SSB selected in S22 (S30).

[0075] In this way, the terminal device 100a in this embodiment identifies a target SSB that the terminal device 100b associates with a target RO to be assigned to the terminal device 100b, among the ROs set in the uplink segment corresponding to the first information and the uplink segment corresponding to the second information. Then, the terminal device 100a in this embodiment identifies, for example, the ROs set in the uplink segment corresponding to the first information and the uplink segment corresponding to the second information as the ROs assigned to the terminal device 100a. Furthermore, the terminal device 100a in this embodiment associates the target SSB with the target RO when setting an SSB for the RO set in the uplink segment corresponding to the first information and the uplink segment corresponding to the second information.

[0076] That is, in this embodiment, the terminal device 100a, for example, sets the index of the SSB to be mapped to the target RO to the same index as the index of the SSB to be mapped to the target RO in a terminal device 100 (for example, terminal device 100b) that does not support SBFD.

[0077] As a result, the base station device 200 in this embodiment can prevent, for example, PRACHs from being transmitted from multiple terminal devices 100 that have different optimal beams. Therefore, the base station device 200 does not need to perform post-processing associated with receiving the PRACHs transmitted from each terminal device 100, for example, and can prevent the occurrence of a situation in which each PRACH cannot be received.

[0078] As in the first embodiment, even if, for example, the third information for terminal device 100a and the third information for terminal device 100b are different information, and the RO to which terminal device 100a performs mapping and the RO to which terminal device 100b performs mapping are different (different in the frequency direction), PRACH may be transmitted from multiple terminal devices 100 with different optimal beams at the same time.

[0079] Therefore, in S28, the terminal device 100a may identify, as a target RO, an RO that has the same time as the RO identified in S25 as a valid RO for the terminal device 100 that does not support SBFD, from among the ROs identified in S26, for example.

[0080] [Modifications of the First and Second Embodiments] Next, modifications of the first and second embodiments will be described.

[0081] (First Modification) The terminal device 100a may determine, for example, by signaling, whether to perform the mapping control process in the first embodiment or the mapping control process in the second embodiment.

[0082] Specifically, the terminal device 100a may receive, for example, information (hereinafter also referred to as fourth information) transmitted from the base station device 200. Then, for example, the terminal device 100a may perform the mapping control process in the first embodiment or the mapping control process in the second embodiment when receiving the fourth information transmitted from the base station device 200. Note that the fourth information may be included in, for example, notification information broadcast from the base station device 200.

[0083] More specifically, the fourth information may include, for example, information indicating either the mapping control process in the first embodiment or the mapping control process in the second embodiment. For example, when the terminal device 100a receives the fourth information including information indicating the mapping control process in the first embodiment, the terminal device 100a may perform the mapping control process in the first embodiment. For example, when the terminal device 100a receives the fourth information including information indicating the mapping control process in the second embodiment, the terminal device 100a may perform the mapping control process in the second embodiment.

[0084] (Second Modification) The terminal device 100a may, for example, determine whether to perform the mapping control process in the first embodiment or the mapping control process in the second embodiment by using the number of SSBs and the number of FDMs allocated per RO.

[0085] Specifically, the terminal device 100a may perform the mapping control processing in the first embodiment or the mapping control processing in the second embodiment, for example, when a value calculated from the number of SSBs and the number of FDMs allocated per RO satisfies a predetermined condition.

[0086] More specifically, the terminal device 100a may perform the mapping control processing in the first embodiment or the mapping control processing in the second embodiment, for example, when the product of the number of SSBs and the number of FDMs allocated per RO is less than or equal to a predetermined value (e.g., 1).

[0087] In addition, the terminal device 100a may perform the mapping control processing in the first embodiment or the mapping control processing in the second embodiment, for example, when the number of ROs assigned to the same SSB is greater than the number of FDMs.

[0088] (Third Modification) The terminal device 100a may transmit the PRACH by using a preamble designated in advance by the base station device 200 from among preambles available for use in the SSB selected in S12 or the like, for example.

[0089] Specifically, the terminal device 100a may receive, for example, information indicating a preamble transmitted from the base station device 200 (hereinafter referred to as fifth information). Then, the terminal device 100a may identify, for example, a preamble indicated by the fifth information received from the base station device 200 from among preambles usable in the SSB selected in S12 or the like, and may further transmit the PRACH by using a preamble randomly selected from the identified preambles. Note that the fifth information may be included in, for example, notification information broadcast from the base station device 200.

[0090] More specifically, the fifth information may include, for example, the number of preambles (hereinafter also simply referred to as the preamble number) that can be used by a terminal device 100 (e.g., terminal device 100b) that does not support SBFD. The terminal device 100a may specify, as a range of indexes for preambles that can be used by the terminal device 100a, a range that is equal to or greater than the index corresponding to the number of preambles and less than the index corresponding to twice the number of preambles or the upper limit of the index that can be set by the base station device 200, and may transmit the PRACH by using a preamble randomly selected from preambles included in the specified range. That is, for example, if the number of preambles is 32, the terminal device 100a may transmit the PRACH by using a preamble randomly selected from preambles with indexes between #32 and #63.

[0091] Furthermore, the fifth information may include, for example, a number of preambles (hereinafter also referred to as a first preamble number) that can be used by a terminal device 100 that does not support SBFD (e.g., the terminal device 100b) and a number of preambles (hereinafter also referred to as a second preamble number) that can be used by a terminal device 100 that supports SBFD (e.g., the terminal device 100a).The terminal device 100a may specify, for example, a range equal to or greater than an index corresponding to the first preamble number and less than an index corresponding to the second preamble number as a range of indexes for preambles that the terminal device 100a can use, and may transmit the PRACH by using a preamble randomly selected from the preambles included in the specified range.

[0092] (Fourth Modification) A fourth modification will be described with reference to Fig. 15. Fig. 15 is a diagram for explaining a specific example of RO.

[0093] For an SBFD-compatible terminal, the number of FDMs may be different from that of a terminal device that does not support SBFD, based on information other than the information included in the third information. Then, the processing described in the first embodiment and the processing described in the second embodiment may be applied. Specifically, similar to the processing described in the first embodiment, an RO other than an RO at the same time and frequency as an RO identified as a valid RO for a terminal device that does not support SBFD is identified as a valid RO for the terminal device itself. Then, among the valid ROs identified for the terminal device itself by the processing described in the second embodiment, a valid RO for the terminal that does not support SBFD and a valid RO for the terminal itself that is different in the device frequency direction but at the same time may be designated as a target RO, and the SSB mapped to the target RO may be the same as the valid RO for the terminal that does not support SBFD.

[0094] 10: Wireless communication system 100: Terminal device 100a: Terminal device 100b: Terminal device 110: CPU 120: Storage 121: Terminal communication program 122: Mapping control program 130: Memory 150: Wireless communication circuit 151: Antenna 200: Base station device 210: CPU 220: Storage 221: Base station communication program 230: Memory 250: Wireless communication circuit 251: Antenna

Claims

1. A receiver that receives first information regarding the configuration of an uplink section, a downlink section, and a flexible section in a plurality of sections, second information regarding the configuration of SBFD (Subband non-overlapping Full Duplex) that configures an uplink section in at least a part of the downlink section and the flexible section configured by the first information, and third information that is information regarding an RO (Rach Occasion); a controller that, according to the first information, the second information, and the third information, identifies, as the RO allocated to the own device, the RO that is configured in the uplink section corresponding to the first information and the uplink section corresponding to the second information, and in which an SSB (Synchronization Signal Block) that is associated with each RO by the own device is not different from the SSB that is associated with each RO by another terminal device; and a controller that transmits a PRACH (Physical Access Control Channel) via the identified RO. a transmitting unit that transmits a random access channel (RANDOM ACCESS CHANNEL) to a base station device.

2. The terminal device according to claim 1, wherein the control unit identifies the RO set in the uplink section corresponding to the second information as the RO assigned to the terminal device itself.

3. The terminal device according to claim 2, wherein the other terminal device is a terminal that can recognize the first information and the third information but cannot recognize the second information, and the control unit identifies, among the ROs set in each of the uplink section corresponding to the first information and the uplink section corresponding to the second information, an RO other than a specific RO assigned to the other terminal device as the RO assigned to the terminal device itself.

4. The terminal device described in claim 3, wherein the control unit identifies, among the ROs set in each of the uplink section corresponding to the first information and the uplink section corresponding to the second information, an RO other than an RO corresponding to the same time as the specific RO as the RO assigned to the device itself.

5. The terminal device according to claim 1, wherein the control unit associates the SSB with the RO assigned to the terminal device.

6. The terminal device according to claim 5, wherein the other terminal device is a terminal capable of recognizing the first information and the third information but unable to recognize the second information, and the control unit: identifies a specific SSB that the other terminal device associates with a specific RO assigned to the other terminal device, among the ROs set in each of the uplink section corresponding to the first information and the uplink section corresponding to the second information; identifies the ROs set in each of the uplink section corresponding to the first information and the uplink section corresponding to the second information as the ROs assigned to the terminal device itself; and when setting the SSB for the ROs set in each of the uplink section corresponding to the first information and the uplink section corresponding to the second information, associates the specific SSB with the specific RO.

7. The terminal device according to claim 1, wherein the receiving unit receives fourth information from the base station device, and the control unit, upon receiving the fourth information, performs a process of identifying the RO assigned to the terminal device.

8. The terminal device according to claim 1, wherein the control unit performs a process of identifying the RO assigned to the device when a value calculated from the number of SSBs associated with the RO and the number of ROs corresponding to the same time period satisfies a predetermined condition.

9. The terminal device according to claim 1, wherein the control unit performs a process of identifying the RO assigned to the terminal device when the number of ROs associated with the same SSB is greater than the number of ROs associated with the same time period.

10. The terminal device according to claim 1, wherein the receiving unit receives fifth information regarding a preamble from a base station device, and the transmitting unit transmits the PRACH to the base station device by using a preamble corresponding to the fifth information.

11. A base station device comprising: a transmitter that transmits first information regarding the setting of uplink sections, downlink sections, and flexible sections in multiple sections, second information regarding the setting of SBFD that sets uplink sections in at least some of the downlink sections and flexible sections set by the first information, and third information that is information regarding ROs; and a receiver that receives a PRACH via a specific RO identified in accordance with the first information, the second information, and the third information among the ROs, wherein the specific RO is an RO in which the SSB associated with each RO by a terminal device that is the source of the PRACH is not different from the SSB associated with each RO by another terminal device that is the source of the PRACH.

12. A wireless communication system having a terminal device and a base station device, wherein the base station device transmits first information regarding the configuration of uplink sections, downlink sections, and flexible sections in a plurality of sections, second information regarding the configuration of SBFD that configures uplink sections in at least some of the downlink sections and flexible sections configured by the first information, and third information that is information regarding ROs, and the terminal device, according to the first information, the second information, and the third information, identifies, among the ROs configured in the uplink section corresponding to the first information and the uplink section corresponding to the second information, an RO whose SSB associated with each RO by the terminal device does not differ from the SSB associated with each RO by other terminal devices, as the RO assigned to the terminal device, and transmits a PRACH to the base station device via the identified RO.

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