Terminal device and base station device

Abstract

A terminal device and a base station device are provided that can handle simultaneous communication states of unicast communication and broadcast communication. [Solution] The terminal device comprises a unicast communication processing unit that performs processing related to unicast communication, a broadcast communication processing unit that performs processing related to broadcast communication, and a communication processing unit that, when the broadcast communication is performed between the terminal device and a base station device, notifies the base station device of information indicating the radio resources for the broadcast communication.

Description

[Technical Field]

[0001] The present disclosure relates to a terminal device and a base station device for wireless communication. [Background technology]

[0002] Currently, the 3GPP (3rd Generation Partnership Project) is studying MBS (Multicast and Broadcast Services) for specification (see Non-Patent Document 1). With regard to MBS, a method has been proposed to solve the problems of low efficiency in MBS data processing and dynamic multicast broadcast processing in mobile networks (see, for example, Patent Document 1).

[0003] When a terminal device and a network communicate in multicast mode, the terminal device and the network need to be in a communication connection state (RRC Connected) in which a wireless communication connection between the terminal device and the network is established in order to support feedback transmission of signaling, ACK / NACK, etc. On the other hand, when a terminal device and a network communicate in broadcast mode, communication is possible not only in the above-mentioned communication connection state but also in an idle state (RRC Idle) in which a wireless communication connection between the terminal device and the network is not established. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-289164 [Non-patent literature]

[0005] [Non-Patent Document 1] TS23.247. 5G Evolution for Multicast and Broadcast Services in 3GPP Release 17 Summary of the Invention [Problem to be solved by the invention]

[0006] A terminal device in an idle state basically does not transmit feedback to the network even when it receives data from the network via broadcast communication. The network cannot determine whether the data transmitted via broadcast communication is received by a terminal device in an idle state. Therefore, when performing unicast communication with a terminal device that performs broadcast communication in an idle state, the network may allocate radio resources beyond the capacity of the terminal device.

[0007] For example, carrier aggregation (CA) is a well-known wireless communication technology that bundles radio waves in multiple different frequency bands together to transmit and receive data as a single communication line. If the terminal device's maximum capability is 5CA, the terminal device can perform 5CA wireless communication using five component carriers (CC). If the network is not aware that the terminal device is in an idle state and receiving a 2CA broadcast, it may allocate 5CA wireless resources to perform unicast communication with this terminal device. In this case, the terminal device will be unable to perform 7CA wireless communication, which exceeds its own capability, and communication may become impossible.

[0008] An object of one aspect of the present disclosure is to provide a terminal device and a base station device that can handle simultaneous communication states of unicast communication and broadcast communication. [Means for solving the problem]

[0009] A terminal device according to one aspect of the present disclosure includes a unicast communication processing unit that performs processing related to unicast communication, a broadcast communication processing unit that performs processing related to broadcast communication, and a communication processing unit that, when the broadcast communication is performed between a base station device and the terminal device, notifies the base station device of information indicating the radio resources of the broadcast communication. A base station device according to one embodiment of the present disclosure includes a wireless communication unit capable of performing unicast communication and broadcast communication, and a control unit capable of controlling the unicast communication and the broadcast communication, wherein the control unit has a function of receiving information indicating the wireless resources of the broadcast communication from a terminal device and a function of determining the wireless resources to be used in the unicast communication, and the wireless communication unit has a function of performing the unicast communication with the terminal device using the wireless resources determined by the control unit.

[0010] A terminal device according to one embodiment of the present disclosure comprises a unicast communication processing unit that performs processing related to unicast communication performed with an NR base station device when in an RRC CONNECTED state, a broadcast communication processing unit that performs processing related to broadcast communication performed with an NR base station device when in either the RRC CONNECTED state or the RRC IDLE state, and a notification processing unit that, when the broadcast communication is performed with the NR base station device, notifies the NR base station device performing the unicast communication of information indicating the radio resources of the broadcast communication, and in a simultaneous communication state of the broadcast communication and the unicast communication, the unicast communication is performed using radio resources based on an allocation instruction of the NR base station device.

[0011] A base station device according to one embodiment of the present disclosure includes a wireless communication unit capable of performing unicast communication and broadcast communication, and a control unit capable of controlling the unicast communication and the broadcast communication, wherein the control unit, when notified by a terminal device of information indicating the wireless resources of the broadcast communication, determines the wireless resources to be used in the unicast communication, the wireless communication unit performs the unicast communication with the terminal device using the wireless resources determined by the control unit, the information indicates that data reception via the broadcast communication will be performed by the terminal device, and the wireless communication unit performs the broadcast communication with the terminal device using predetermined wireless resources, and also performs the unicast communication with the terminal device using the wireless resources determined by the control unit. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is an overall configuration diagram of a communication system according to a first embodiment. [Figure 2] FIG. 10 is a diagram illustrating a unicast communication state of a terminal device. [Figure 3] FIG. 2 is a diagram illustrating the physical configuration of a terminal device. [Figure 4] FIG. 2 is a functional block diagram of a control unit. [Figure 5] FIG. 2 is a diagram illustrating the physical configuration of a base station device. [Figure 6A] 4 is a flowchart of a process executed by a terminal device according to the first embodiment. [Figure 6B] 4 is a flowchart of a process executed by a terminal device according to the first embodiment. [Figure 6C] 4 is a flowchart of a process executed by a terminal device according to the first embodiment. [Figure 6D] 4 is a flowchart of a process executed by a terminal device according to the first embodiment. [Figure 7] 10 is a flowchart of processing executed by a base station device according to the first embodiment. [Figure 8]1 is a diagram illustrating the overall configuration of a communication system in which terminal devices are in a simultaneous communication state. [Figure 9] FIG. 10 is a diagram for explaining a simultaneous communication state of the terminal device. [Figure 10A] 10 is a time chart showing an example in which a simultaneous communication state occurs in the first embodiment. [Figure 10B] 10 is a time chart showing an example in which a simultaneous communication state is resolved in the first embodiment. [Figure 11] FIG. 10 is an overall configuration diagram of a communication system according to a second embodiment. [Figure 12A] 10 is a flowchart of a process executed by a terminal device according to the second embodiment. [Figure 12B] 10 is a flowchart of a process executed by a terminal device according to the second embodiment. [Figure 13] 10 is a flowchart of a process executed by a base station device according to the second embodiment. [Figure 14A] 10 is a time chart showing an example in which a simultaneous communication state occurs in the second embodiment. [Figure 14B] 10 is a time chart showing an example in which a simultaneous communication state is resolved in the second embodiment. [Figure 15] 10 is a flowchart of a process executed by a base station device according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the drawings, the same or equivalent elements are designated by the same reference numerals, and redundant description will be omitted.

[0014] First Embodiment The configuration of a communication system 100 according to the first embodiment will be described. FIG. 1 is a diagram illustrating the overall configuration of the communication system 100 according to the first embodiment. FIG. 2 is a diagram illustrating the unicast communication state of a terminal device 110. FIG. 3 is a diagram illustrating the physical configuration of the terminal device 110. FIG. 4 is a functional block diagram of a control unit 301. FIG. 5 is a diagram illustrating the physical configuration of a base station device 120.

[0015] A communication system 100 according to the first embodiment is a 5G wireless communication network. As shown in Fig. 1, the communication system 100 includes a terminal device 110, a base station device 120, a core network device 130, and the like. The terminal device 110 is user equipment (UE) that complies with the 5G standard, and is, for example, a smartphone, a tablet, or a laptop PC. The terminal device 110 may also be compatible with the LTE (Long Term Evolution) or 4G standard in addition to the 5G standard.

[0016] The base station device 120 can communicate with the terminal device 110 located in a cell that can communicate with the base station device 120. The base station device 120 of this embodiment is an NR (New Radio) base station device that communicates with the terminal device 110 by NR, and is, for example, a gNB (next generation NodeB) that constitutes a RAN (Radio Access Network).

[0017] The core network device 130 constitutes a backbone network that controls, for example, the Internet, a fixed telephone network, and a mobile network. The core network device 130 is connected to the base station device 120 and is capable of communicating with each other. The core network device 130 of this embodiment constitutes a 5G core network (5GC), and includes a user packet function (UPF) that handles user data, an access and mobility management function (AMF) that manages access and mobility, a session management function (SMF) that manages communication sessions, and the like.

[0018] In the communication system 100, a terminal device 110, while moving, can select an optimal base station device 120 at the location of the movement, and communicate with a core network device 130 via the selected base station device 120. The communication system 100 can perform one-to-one communication in which one base station device 120 and one terminal device 110 communicate wirelessly, and one-to-multiple communication in which one base station device 120 and multiple terminal devices 110 communicate wirelessly.

[0019] The RAN configured by the base station device 120 and the 5GC configured by the core network device 130 are collectively referred to as a network. The terminal device 110 registers location information with the network based on a signal received from the base station device 120. Next, the terminal device 110 attempts to establish a wireless communication connection (PDU session) to the network via the base station device 120. The state of the terminal device 110 in which location registration with the network has been executed and a wireless communication connection has not been established is referred to as an idle state (RRC Idle). The state of the terminal device 110 in which location registration with the network has been executed and a wireless communication connection has been established is referred to as a communication connected state (RRC Connected).

[0020] The communication system 100 of this embodiment supports a unicast communication mode and a broadcast communication mode as wireless communication modes between the terminal device 110 and the network. The unicast communication is one-to-one communication in which the terminal device 110 and the base station device 120 can communicate with each other in a communication connected state (RRC Connected). The broadcast communication is one-to-many communication in which the terminal device 110 can receive data transmitted from the base station device 120 in either an idle state (RRC Idle) or a communication connected state (RRC Connected).

[0021] The communication system 100 may further support a multicast communication mode for point-to-multipoint communication as a wireless communication mode. The multicast communication is point-to-multipoint communication in which the terminal devices 110 and the base station devices 120 can communicate with each other in a communication connection state (RRC Connected).

[0022] The communication system 100 also supports carrier aggregation (CA). As an example, the maximum capability of the terminal device 110 is 5CA. In the example of FIGS. 1 and 2, the terminal device 110 is in a communication connection state and is performing unicast communication with the base station device 120. The base station device 120 allocates five component carriers (CCs) corresponding to the maximum capability of the terminal device 110 as radio resources to be allocated to the terminal device 110. For example, the bandwidth of one CC is 100 MHz. This allows the terminal device 110 to perform 5CA unicast communication with the base station device 120.

[0023] Furthermore, the base station device 120 performs 2CA broadcast communication using two CCs within its own cell. In the examples of Figures 1 and 2, the terminal device 110 does not perform broadcast communication, and therefore does not receive data transmitted by broadcast communication. In other words, the base station device 120 performs unicast communication and broadcast communication simultaneously, but the terminal device 110 transmits and receives only unicast communication data.

[0024] 3, the terminal device 110 includes a control unit 301, a storage unit 302, a communication unit 303, an output unit 304, and an operation unit 305. The control unit 301 is, for example, a processor such as a CPU. The control unit 301 may be an MCU (Micro Control Unit) or an MPU (Micro Processor Unit), or may be an FPGA (Field Programmable Gate Array), an ASIC (Application Specific Integrated Circuit), or other circuit having a calculation function.

[0025] The storage unit 302 is a device capable of storing programs and data, and is, for example, a ROM, RAM, cache memory, flash memory, etc. The storage unit 302 stores a control program for controlling the terminal device 110 and various application programs (hereinafter abbreviated as applications) that the user can use on the terminal device 110. The communication unit 303 is a communication module for performing wireless communication via an antenna. The output unit 304 is a device that outputs information in a manner that the user can perceive, and is, for example, a display, lamp, speaker, vibrator, etc. The operation unit 305 is a button, switch, key, touch panel, etc. with which the user operates the terminal device 110.

[0026] In the terminal device 110, the control unit 301 executes a control program stored in the storage unit 302 to realize the respective functional blocks illustrated in Fig. 4. These functional blocks include a one-to-one communication processing unit 401, a one-to-many communication processing unit 402, and a notification processing unit 403. These functional blocks may be incorporated in advance as circuits.

[0027] The one-to-one communication processing unit 401 performs processing related to one-to-one communication in which one base station device 120 and one terminal device 110 communicate wirelessly, and in this embodiment, performs processing related to unicast communication. The one-to-multiple communication processing unit 402 performs processing related to one-to-multiple communication in which one base station device 120 and multiple terminal devices 110 communicate wirelessly, and in this embodiment, performs processing related to broadcast communication.

[0028] The notification processing unit 403 notifies the base station device 120, the other party in the point-to-point communication, of information for adjusting the radio resources used in the point-to-point communication according to the data reception status of the point-to-multipoint communication. In this embodiment, the point-to-multipoint communication is broadcast communication, and the point-to-point communication is unicast communication. Specific processing modes of these functional blocks will be described later.

[0029] As shown in FIG. 5, the base station device 120 includes a control unit 501, a wireless communication unit 502, a storage unit, etc. The control unit 501 is, for example, a processor such as a CPU. The control unit 501 may be an MCU or MPU, or may be an FPGA, ASIC, or other circuit having a calculation function. The storage unit of the base station device 120 is a device capable of storing programs and data, such as a ROM, RAM, cache memory, or flash memory. The storage unit stores a control program for controlling the base station device 120 and various data required to provide RAN. The wireless communication unit 502 is a communication module for performing wireless communication via an antenna.

[0030] The wireless communication unit 502 is capable of performing one-to-one communication in which one base station device 120 and one terminal device 110 communicate wirelessly, and one-to-many communication in which one base station device 120 and multiple terminal devices 110 communicate wirelessly. The control unit 501 is capable of controlling the one-to-one communication and the one-to-many communication. As described above, in this embodiment, the one-to-one communication is unicast communication, and the one-to-many communication is broadcast communication.

[0031] Furthermore, when the control unit 501 is notified by the terminal device 110 of information for adjusting the radio resources used for the one-to-one communication, the control unit 501 adjusts the radio resources used for the one-to-one communication so that the sum of the radio resources used for the one-to-one communication and the radio resources used for the one-to-multiple communication falls within the radio resources usable at the maximum capacity of the terminal device 110. The radio communication unit 502 executes one-to-one communication with the terminal device 110 using the radio resources adjusted by the control unit 501. Specific processing modes for these will be described later.

[0032] In the communication system 100 of the first embodiment, the base station device 120 with which the terminal device 110 performs point-to-point communication and the base station device 120 with which the terminal device 110 performs point-to-multipoint communication are both operated by the same telecommunications carrier and therefore belong to the same network. In this example, the terminal device 110 performs unicast communication and broadcast communication with one base station device 120. Alternatively, the terminal device 110 may perform unicast communication with one base station device 120 and broadcast communication with another base station device 120 among multiple base station devices 120 that belong to the same network.

[0033] Among the various processes executed in the communication system 100 of the first embodiment, the processes relating to unicast communication and broadcast communication executed between the terminal device 110 and the base station device 120 will be described below.

[0034] 6A to 6D are flowcharts of processing executed by the terminal device 110 according to the first embodiment. As shown in Fig. 6A, when the terminal device 110 is powered on, in S601 the control unit 301 registers location information of the terminal device 110 in the network and controls the terminal device 110 to enter a standby state for wireless communication. In this standby state, neither unicast communication nor broadcast communication is performed, and the terminal device 110 enters an idle state (RRC Idle).

[0035] In S603, the one-to-many communication processing unit 402 determines whether a broadcast reception request has been made. For example, if an application started on the terminal device 110 requests data reception via broadcast communication, the one-to-many communication processing unit 402 determines that a broadcast reception request has been made. In this case, the process proceeds to the process shown in FIG. 6B.

[0036] If it is determined in S603 that there is no broadcast reception request, the one-to-one communication processing unit 401 determines in S605 whether there is a unicast communication request. For example, the one-to-one communication processing unit 401 determines that there is a unicast communication request when an application started on the terminal device 110 requests unicast communication or when unicast communication is requested by paging from the network. In this case, the process proceeds to the process shown in FIG. 6C.

[0037] 6B, in S611, the point-to-multipoint communication processing unit 402 controls the terminal device 110 to a broadcast reception state. Specifically, in order to transmit data within the cell by broadcast communication, the base station device 120 transmits a resource allocation instruction, which is a signal instructing allocation of radio resources to be used in broadcast communication, to all terminal devices 110 within the cell of the base station device 120. Based on the resource allocation instruction received from the base station device 120, the point-to-multipoint communication processing unit 402 allocates the radio resources of the terminal device 110 to broadcast communication.

[0038] As a result, the terminal device 110 is controlled to a broadcast reception state, performs broadcast communication using the allocated radio resources, and receives data transmitted from the base station device 120. In this broadcast reception state, data is received without establishing a wireless communication connection between the terminal device 110 and the network, and therefore the terminal device 110 enters an idle state (RRC Idle).

[0039] Next, in S613, the one-to-many communication processing unit 402 determines whether a broadcast disconnection request has been made. For example, the one-to-many communication processing unit 402 determines that a broadcast disconnection request has been made when the application that issued the broadcast reception request has been terminated. In this case, the one-to-many communication processing unit 402 ends data reception via broadcast communication and returns the process to S601 (see FIG. 6A). The wireless resources allocated to broadcast communication are released, and the terminal device 110 returns to a standby state.

[0040] If it is determined in S613 that there is no broadcast disconnection request, then in S615 the one-to-one communication processing unit 401 determines whether there is a unicast communication request. If it is determined in S615 that there is no unicast communication request, the process returns to S611, and the broadcast reception state continues. On the other hand, if it is determined in S615 that there is a unicast communication request, then in S617 the notification processing unit 403 transmits a broadcast reception notification to the base station device 120. The broadcast reception notification indicates that data reception by broadcast communication will be executed in the terminal device 110. Then, the process proceeds to the process shown in FIG. 6D.

[0041] 6C, in S621, the one-to-one communication processing unit 401 controls the terminal device 110 to a unicast communication state. Specifically, in order to transmit and receive data to and from the counterpart terminal device 110 via unicast communication, the base station device 120 transmits a resource allocation instruction, which is a signal instructing allocation of wireless resources to be used in unicast communication, to the counterpart terminal device 110. Based on the resource allocation instruction received from the base station device 120, the one-to-one communication processing unit 401 allocates the wireless resources of the terminal device 110 to unicast communication.

[0042] As a result, the terminal device 110 is controlled to the unicast communication state, performs unicast communication using the allocated radio resources, and transmits and receives data to and from the base station device 120. In the unicast communication state, a radio communication connection between the terminal device 110 and the network is established, and therefore the terminal device 110 enters a communication connected state (RRC Connected).

[0043] In this embodiment, the base station device 120 transmits to the terminal device 110 a resource allocation instruction, which is a signal instructing allocation of radio resources corresponding to the maximum capability of the terminal device 110, based on capability information (e.g., UE Capability Information) notified to the network by the terminal device 110. The terminal device 110 performs high-speed, large-capacity unicast communication by CA using a CC corresponding to the maximum capability of the terminal device 110, for example.

[0044] Next, in S623, the one-to-one communication processing unit 401 determines whether a unicast disconnection request has been made. For example, the one-to-one communication processing unit 401 determines that a unicast disconnection request has been made when the application that issued the unicast communication request has been terminated or when a unicast communication disconnection request has been made by paging from the network. In this case, the one-to-one communication processing unit 401 ends the unicast communication and returns the process to S601 (see FIG. 6A). The wireless resources allocated to the unicast communication are released, and the terminal device 110 returns to the standby state.

[0045] If it is determined in S623 that there is no unicast disconnection request, then in S625 the one-to-many communication processing unit 402 determines whether there is a broadcast reception request. If it is determined in S625 that there is no broadcast reception request, then the process returns to S621, and the unicast communication state continues. On the other hand, if it is determined in S625 that there is a broadcast reception request, then in S627 the notification processing unit 403 transmits a broadcast reception notification to the base station device 120. Then, the process proceeds to the process shown in FIG. 6D.

[0046] 6D, in S631, the one-to-one communication processing unit 401 and the one-to-multiple communication processing unit 402 control the terminal device 110 to a simultaneous communication state. Because the simultaneous communication state involves unicast communication, the terminal device 110 enters a communication connected state (RRC Connected). In the simultaneous communication state, the terminal device 110 transmits and receives data using radio resources allocated to unicast communication, and receives data using radio resources allocated to broadcast communication. The radio resources allocated to unicast communication in the simultaneous communication state are adjusted by the base station device 120, as will be described later.

[0047] Next, in S633, the one-to-one communication processing unit 401 determines whether a unicast disconnection request has been made. If it is determined in S633 that a unicast disconnection request has been made, the one-to-one communication processing unit 401 ends the unicast communication and returns the process to S611 (see FIG. 6B). The wireless resources allocated to the unicast communication are released, and the terminal device 110 returns to the broadcast reception state.

[0048] In this embodiment, immediately after the unicast communication is terminated as described above, the one-to-many communication processing unit 402 transitions the terminal device 110 from the simultaneous communication state to the broadcast reception state while maintaining the communication connected state (RRC Connected). After that, if a certain period of time elapses without the unicast communication being resumed, the one-to-many communication processing unit 402 executes S611 to transition the terminal device 110 from the communication connected state to the idle state (RRC Idle). As a result, the terminal device 110 is controlled to the broadcast reception state in which data is received in the idle state.

[0049] If it is determined in S633 that there is no unicast disconnection request, then in S635 the one-to-many communication processing unit 402 determines whether there is a broadcast disconnection request. If it is determined in S635 that there is no broadcast disconnection request, then the process returns to S631, and the simultaneous communication state continues.

[0050] On the other hand, if it is determined in S635 that a broadcast disconnection request has been made, the notification processing unit 403 transmits a broadcast disconnection notification to the base station device 120 in S637. The broadcast disconnection notification indicates that data reception by broadcast communication will be disconnected in the terminal device 110. In this case, the one-to-multipoint communication processing unit 402 ends the broadcast communication and returns the processing to S621 (see FIG. 6C). The wireless resources allocated to the broadcast communication are released in the terminal device 110, and the terminal device 110 returns to a unicast communication state.

[0051] As described above, notification processing unit 403 notifies counterpart base station device 120 in point-to-point communication of information for adjusting the radio resources used for point-to-point communication, depending on the data reception status of the point-to-multipoint communication. In the example of FIGS. 6A to 6D, notification processing unit 403 transmits a broadcast reception notification or a broadcast disconnection notification to counterpart base station device 120 in unicast communication, depending on the data reception status of the broadcast communication, at S617, S627, and S637. The broadcast reception notification and broadcast disconnection notification function as information for causing counterpart base station device 120 to adjust the radio resources used for unicast communication.

[0052] When a simultaneous communication state occurs in which one-to-one communication and one-to-multiple communication are executed simultaneously, notification processing unit 403 notifies the above information to base station device 120, the other party in the one-to-one communication. In the examples of Figures 6A to 6D, notification processing unit 403 transmits broadcast reception notifications in S617 and S627 before the simultaneous communication state occurs in S631.

[0053] When the simultaneous communication state is terminated by disconnecting the point-to-multipoint communication, the notification processing unit 403 notifies the above information to the other party in the point-to-point communication, base station device 120. In the example of Figures 6A to 6D, when it is determined in S635 that there is a broadcast disconnection request, the notification processing unit 403 transmits a broadcast disconnection notification in S637 before transitioning from the simultaneous communication state to the broadcast reception state.

[0054] In a simultaneous communication state that occurs, when a counterpart base station device 120 for point-to-point communication and a counterpart base station device 120 for point-to-multipoint communication both belong to the jurisdiction of the same network, notification processing unit 403 notifies information indicating that data reception will be performed via point-to-multipoint communication to counterpart base station device 120 for point-to-point communication. In the examples of Figures 6A to 6D, notification processing unit 403 transmits a broadcast reception notification indicating that data reception will be performed via broadcast communication to counterpart base station device 120 for unicast communication.

[0055] 7 is a flowchart of processing executed by the base station device 120 according to the first embodiment. More specifically, FIG. 7 is a flowchart of unicast communication control executed by the base station device 120.

[0056] The control unit 501 of the base station device 120 executes broadcast communication control in parallel with the unicast communication control of Fig. 7. In this broadcast communication control, when a broadcast distribution request is received from the network, the base station device 120 transmits distribution data by broadcast communication to all terminal devices 110 within its cell. At this time, the base station device 120 uses predetermined radio resources determined by the base station device 120 to transmit data by, for example, 2CA broadcast communication using two CCs.

[0057] 7, when a unicast communication request is received from the terminal device 110 or the network, the control unit 501 determines in S701 that a unicast communication request has occurred, and determines in S703 whether a broadcast reception notification has been received. If the control unit 501 does not receive a broadcast reception notification from the terminal device 110, it determines that there is no broadcast reception notification. In this case, in S705, the control unit 501 performs unicast communication using the wireless resources of the terminal's maximum capability.

[0058] As described above, the control unit 501 transmits to the terminal device 110 a resource allocation instruction corresponding to the maximum capability of the terminal device 110 based on capability information of the terminal device 110 previously registered in the network. As a result, the base station device 120 performs high-speed, large-capacity unicast communication using, for example, radio resources corresponding to the maximum capability of the terminal device 110. Thereafter, the control unit 501 returns the process to S703.

[0059] On the other hand, when the control unit 501 receives a broadcast reception notification from the terminal device 110, it determines in S703 that there is a broadcast reception notification. In this way, when information for adjusting the radio resources used for one-to-one communication is notified from the terminal device 110, in S707 the control unit 501 adjusts the radio resources for unicast communication based on the resource allocation information as follows.

[0060] In this embodiment, both broadcast communication and unicast communication are performed by the base station device 120 under the jurisdiction of the same network. Therefore, the base station device 120 recognizes resource allocation information indicating the predetermined radio resources allocated to the broadcast communication. Based on this resource allocation information, the control unit 501 can identify the radio resources that the terminal device 110 will use for the broadcast communication.

[0061] As described above, the control unit 501 adjusts the radio resources used in the one-to-one communication so that the sum of the radio resources used in the one-to-one communication and the radio resources used in the one-to-multiple communication falls within the radio resources usable at the maximum capability of the terminal device 110. For example, the control unit 501 subtracts predetermined radio resources allocated to broadcast communication from the radio resources corresponding to the maximum capability of the terminal device 110 based on the capability information of the terminal device 110 and the above-described resource allocation information. The control unit 501 adjusts the radio resources allocated to unicast communication so that the radio resources are equal to or less than the calculated radio resources.

[0062] The wireless communication unit 502 performs unicast communication with the terminal device 110 using the wireless resources adjusted by the control unit 501. At this time, the wireless communication unit 502 performs broadcast communication using the predetermined wireless resources described above in parallel with the unicast communication, so that the terminal device 110 is controlled to be in a simultaneous communication state.

[0063] In this embodiment, in order to make the most of the radio resources of the terminal device 110, the control unit 501 adjusts the radio resources allocated to unicast communication so that they are equal to the radio resources calculated as described above. As a result, the base station device 120 performs efficient unicast communication using radio resources corresponding to the surplus capacity of the terminal device 110 that performs broadcast communication.

[0064] Next, the control unit 501 determines whether a broadcast disconnection notification has been received in S709. If the control unit 501 receives a broadcast disconnection notification from the terminal device 110, the control unit 501 transitions the process to S705. This returns the state to one in which only unicast communication is performed using the terminal's maximum capacity radio resources between the terminal device 110 and the base station device 120. Note that if the control unit 501 determines in S709 that a broadcast disconnection notification has not been received, the simultaneous communication state continues in the terminal device 110, and so the process returns to S709.

[0065] As described above, in this embodiment, both the point-to-point communication and the point-to-multipoint communication are executed by the base station device 120 under the jurisdiction of the same network. In this case, the information for adjusting the radio resources used for the point-to-point communication indicates that data reception by point-to-multipoint communication will be executed by the terminal device 110. In the example of Fig. 7, the broadcast reception notification indicates that data reception by broadcast communication will be executed.

[0066] In this case, the control unit 501 adjusts the radio resources used in the point-to-point communication based on the predetermined radio resources used in the point-to-multipoint communication. The radio communication unit 502 performs point-to-multipoint communication with the terminal device 110 using the predetermined radio resources, and also performs point-to-point communication with the terminal device 110 using the radio resources adjusted by the control unit 501. In the example of Fig. 7, in S707 the control unit 501 adjusts the radio resources used in the unicast communication based on the predetermined radio resources indicated by the resource allocation information. The radio communication unit 502 performs broadcast communication using the predetermined radio resources and unicast communication using the adjusted radio resources with the terminal device 110.

[0067] In the communication system 100 of the first embodiment, as an example of the base station device 120 adjusting the radio resources used in one-to-one communication, a case where the base station device 120 adjusts the CA of unicast communication will be described. Fig. 8 is a diagram showing the overall configuration of a communication system in which the terminal devices 110 are in a simultaneous communication state. Fig. 9 is a diagram for explaining the simultaneous communication state of the terminal devices 110. In the following description, as in the example of Fig. 1, it is assumed that the maximum capacity of the terminal device 110 is 5 CA and the base station device 120 performs 2 CA broadcast communication.

[0068] 10A is a time chart of an example in which a simultaneous communication state occurs in the first embodiment. At T1001, the terminal device 110 is controlled to a broadcast reception state at S611 and receives data from the base station device 120 via 2CA broadcast communication (see FIG. 1). At T1002, when a unicast communication request occurs in the terminal device 110, the terminal device 110 determines at S615 that a unicast communication request has been made. At T1003, the terminal device 110 transmits a broadcast reception notification at S617 to the base station device 120.

[0069] In the base station device 120, a unicast communication request occurs in S701, as in T1002. If, in T1004, the base station device 120 determines in S615 that a broadcast reception notification has been received, it adjusts the radio resources for unicast communication in S707. Specifically, the base station device 120 calculates 3CA by subtracting 2CA for broadcast communication from 5CA, which is the maximum terminal capability. The base station device 120 transmits a resource allocation instruction for the three CCs used in the calculated 3CA to the terminal device 110.

[0070] In T1005, the terminal device 110 that has received the resource allocation instruction is controlled to a simultaneous communication state in S631. As a result, the terminal device 110 simultaneously executes broadcast communication and unicast communication with the base station device 120, as shown in Figures 8 and 9. At this time, the terminal device 110 receives data via 2CA broadcast communication and transmits and receives data via 3CA unicast communication. In other words, the terminal device 110 simultaneously executes broadcast communication and unicast communication using radio resources that do not exceed the terminal's maximum capability, thereby preventing communication from becoming unavailable.

[0071] 10B is a time chart of an example in which the simultaneous communication state is terminated in the first embodiment. At T1011, the terminal device 110 is controlled to the simultaneous communication state in the same manner as at T1005. At T1012, when a broadcast disconnection request occurs in the terminal device 110, the terminal device 110 determines in S635 that a broadcast disconnection request has been received. At T1013, the terminal device 110 transmits a broadcast disconnection notification to the base station device 120 in S637.

[0072] In T1014, if the base station device 120 determines in S709 that there is a broadcast disconnection notification, it transmits a resource allocation instruction for unicast communication corresponding to the terminal's maximum capability of 5CA to the terminal device 110 in S705. In T1015, the terminal device 110 that has received the resource allocation instruction is controlled to a unicast communication state in S621. As a result, the terminal device 110 performs high-speed, large-capacity data transmission and reception with the base station device 120 by unicast communication of 5CA, the terminal's maximum capability, using the allocated five CCs, as shown in Figures 1 and 2.

[0073] As described above, the terminal device 110 may perform unicast communication with one base station device 120 and broadcast communication with another base station device 120 among multiple base station devices 120 that belong to the jurisdiction of the same network. In this case, the processing in Fig. 7 may be performed by the base station device 120 that performs unicast communication. The terminal device 110 may transmit a broadcast reception notification and a broadcast disconnection notification to the base station device 120 that performs unicast communication.

[0074] In the above embodiment, each of the broadcast reception notification and the broadcast disconnection notification may be transmitted and received independently, or may be transmitted and received together with other information. For example, the terminal device 110 may transmit each of the broadcast reception notification and the broadcast disconnection notification to the base station device 120 by including them in a message (UE Capability message) for notifying the network of capability information of the terminal device 110.

[0075] Note that the point-to-multipoint communication in the first embodiment may be broadcast communication that supports feedback transmission of ACK information / NACK information. For example, a terminal device 110 in an idle state (RRC Idle) transmits ACK information to the base station device 120 if it has successfully received data via broadcast communication, and transmits NACK information to the base station device 120 if it has failed to receive data via broadcast communication.

[0076] In such broadcast communication, the ACK / NACK information may include identification information of the source terminal device 110. In this case, the base station device 120 that receives the ACK / NACK information determines that the source terminal device 110 of the ACK / NACK information is receiving data via broadcast communication, and can adjust the radio resources for unicast communication as in S707. Therefore, the terminal device 110 does not need to transmit a broadcast reception notification even when a simultaneous communication state occurs.

[0077] Second Embodiment The second embodiment of the present disclosure will be described, focusing on the differences from the first embodiment. First, the configuration of a communication system 100 according to the second embodiment will be described. Fig. 11 is an overall configuration diagram of the communication system 100 according to the second embodiment.

[0078] A communication system 100 of the second embodiment includes, in addition to a terminal device 110, a plurality of base station devices 120 and a plurality of core network devices 130 operated by a plurality of telecommunications carriers. The example in Fig. 11 shows a base station device 120A and a core network device 130A operated by telecommunications carrier A, and a base station device 120B and a core network device 130B operated by telecommunications carrier B. When the terminal device 110 is in an area where the cells of the base station devices 120A and 120B overlap, it is able to communicate wirelessly with both the networks of telecommunications carriers A and B.

[0079] In the communication system 100 of the second embodiment, the base station device 120 with which the terminal device 110 performs point-to-point communication and the base station device 120 with which the terminal device 110 performs point-to-multipoint communication are operated by different telecommunications carriers. In the example of Fig. 11, the terminal device 110 transmits and receives data via unicast communication with the base station device 120A that belongs to the network jurisdiction of telecommunications carrier A. Because the base station device 120B that belongs to the network jurisdiction of telecommunications carrier B performs 2CA broadcast communication, the terminal device 110 can receive data transmitted by this broadcast communication.

[0080] Among the various processes executed in the communication system 100 of the second embodiment, a description will be given of processes relating to unicast communication and broadcast communication executed between the terminal device 110 and the base station device 120. Figures 12A and 12B are flowcharts of the processes executed by the terminal device 110 according to the second embodiment. Only the points that differ from the processes of the first embodiment (see Figures 6A to 6D) will be described below.

[0081] 12A, if it is determined in S615 that a unicast communication request has been received, the notification processing unit 403 determines in S1201 whether the unicast communication and the broadcast communication are under the same network jurisdiction. For example, if the base station device 120 at the other end of the unicast communication and the base station device 120 at the other end of the broadcast communication are operated by the same telecommunications carrier, the notification processing unit 403 determines that the network jurisdiction is the same. In this case, the notification processing unit 403 transmits a broadcast reception notification to the base station device 120 in S617, as in the first embodiment.

[0082] If it is determined in S1201 that the networks under jurisdiction are different, in S1203 the notification processing unit 403 transmits a broadcast resource notification to the base station device 120 at the other end of the unicast communication. The broadcast resource notification indicates the radio resources used in the broadcast communication executed by the terminal device 110. The broadcast resource notification of this embodiment includes the number of CAs for the broadcast communication. The number of CAs is the number of CCs used in CAs in the broadcast communication. Note that the broadcast resource notification may also include the number of layers of MIMO (Multi Input Multi Output) executed in the broadcast communication.

[0083] For example, the notification processing unit 403 identifies the radio resources being used in the current broadcast communication based on the broadcast reception status controlled in S611. The notification processing unit 403 transmits a broadcast resource notification indicating the identified radio resources for the broadcast communication to the base station device 120 that is the destination of the unicast communication. After execution of S617 or S1203, the process proceeds to the process shown in FIG. 6D.

[0084] 12B, if it is determined in S625 that there is a broadcast reception request, the notification processing unit 403 determines in S1211 whether the network jurisdiction for the unicast communication and the broadcast communication is the same. If it is determined in S1211 that the network jurisdiction is the same, the notification processing unit 403 transmits a broadcast reception notification to the base station device 120 in S627, as in the first embodiment.

[0085] If it is determined in S1211 that the networks under jurisdiction are different, in S1213 the notification processing unit 403 transmits a broadcast resource notification to the base station device 120 that is the destination of the unicast communication. For example, based on the broadcast reception request determined in S625, the notification processing unit 403 identifies the radio resources to be used in the broadcast communication generated by this request. The notification processing unit 403 transmits a broadcast resource notification indicating the identified radio resources for the broadcast communication to the base station device 120 that is the destination of the unicast communication. After execution of S627 or S1213, the process proceeds to the process shown in FIG. 6D.

[0086] As described above, notification processing unit 403 notifies counterpart base station device 120 with which point-to-point communication is performed of information for adjusting the radio resources used in point-to-point communication, in accordance with the data reception status of the point-to-multipoint communication. In the examples of Figures 12A and 12B, notification processing unit 403 transmits a broadcast resource notification to counterpart base station device 120 with which unicast communication is performed, in accordance with the data reception status of broadcast communication, at S1203 and S1213. The broadcast resource notification functions as information for causing counterpart base station device 120 to adjust the radio resources used in unicast communication.

[0087] When a simultaneous communication state occurs in which one-to-one communication and one-to-multiple communication are executed simultaneously, the notification processing unit 403 notifies the above information to the other party's base station device 120 with which the one-to-one communication is to be performed. In the examples of Figures 12A and 12B, the notification processing unit 403 transmits broadcast resource notifications at S1203 and S1213 before the simultaneous communication state occurs at S631.

[0088] When the base station device 120, which is the counterpart of the point-to-point communication, and the base station device 120, which is the counterpart of the point-to-multipoint communication, belong to different networks, the notification processing unit 403 notifies the base station device 120, which is the counterpart of the point-to-multipoint communication, of information indicating the radio resources to be used in the point-to-multipoint communication. In the examples of Figures 12A and 12B, the notification processing unit 403 transmits a broadcast resource notification, which indicates the radio resources to be used in the broadcast communication executed by the terminal device 110, to the base station device 120, which is the counterpart of the point-to-multipoint communication,

[0089] Fig. 13 is a flowchart of processing executed by the base station device 120 according to the second embodiment. Only the differences from the processing according to the first embodiment (see Fig. 7) will be described below. As shown in Fig. 13, if it is determined in S703 that there is no broadcast reception request, the control unit 501 determines in S1301 whether there is a broadcast resource notification. If the control unit 501 receives a broadcast resource notification from the terminal device 110, it determines that there is a broadcast resource notification.

[0090] In this case, in S1303, the control unit 501 adjusts the radio resources for unicast communication based on the broadcast resource notification as follows: In this embodiment, broadcast communication and unicast communication are performed by base station device 120 that belong to the jurisdiction of different networks. Therefore, the base station device 120 that performs unicast communication is not aware of the radio resources allocated to broadcast communication by the other network.

[0091] Therefore, the control unit 501 identifies the radio resources that the terminal device 110 uses for broadcast communication, based on the broadcast resource notification received from the terminal device 110. This allows the control unit 501 to adjust the radio resources to be allocated to unicast communication, similar to the first embodiment, based on the identified radio resources for broadcast communication and the capability information of the terminal device 110.

[0092] For example, the control unit 501 adjusts the CCs allocated to unicast communication so that the number of CAs is equal to or less than the number of CAs in the capability information minus the number of CAs in the broadcast resource notification. The wireless communication unit 502 executes unicast communication for the number of CAs using the adjusted CCs. As a result, the terminal device 110 executes unicast communication with the base station device 120 and broadcast communication with other base station devices 120, and is controlled to a simultaneous communication state.

[0093] Next, the control unit 501 determines whether a broadcast disconnection notification has been received in S1305. If the control unit 501 receives a broadcast disconnection notification from the terminal device 110, the control unit 501 transitions the process to S705. This returns the state to one in which only unicast communication is performed using the terminal's maximum capacity radio resources between the terminal device 110 and the base station device 120. Note that if the control unit 501 determines in S1305 that a broadcast disconnection notification has not been received, the simultaneous communication state continues in the terminal device 110, and so the process returns to S1305.

[0094] As described above, in this embodiment, one-to-one communication and one-to-many communication are performed by a plurality of base station devices 120 that belong to the jurisdiction of different networks. In this case, the information for adjusting the radio resources used in the one-to-one communication indicates the radio resources used in the one-to-many communication performed by the terminal device 110 with the other base station devices 120. In the example of FIG. 13 , the broadcast resource notification indicates the radio resources used in the broadcast communication performed by the terminal device 110 with the other base station devices 120.

[0095] In this case, the control unit 501 adjusts the radio resources used in the one-to-one communication based on the radio resources indicated by the above information. The radio communication unit 502 uses the radio resources adjusted by the control unit 501 to perform one-to-one communication with the terminal device 110, but does not perform one-to-multiple communication with the terminal device 110. In the example of Fig. 13, in S1303, the control unit 501 adjusts the radio resources used in unicast communication based on the radio resources indicated in the broadcast resource notification. The radio communication unit 502 performs unicast communication with the terminal device 110 using the adjusted radio resources, but does not perform broadcast communication.

[0096] As an example of adjusting the radio resources used in point-to-point communication by the base station device 120 in the communication system 100 of the second embodiment, a case will be described in which the base station device 120A adjusts the CC used in CA for unicast communication. In the following explanation, as in the example of Fig. 1, it is assumed that the maximum capacity of the terminal device 110 is 5 CA and the base station device 120B performs 2 CA broadcast communication.

[0097] 14A is a time chart of an example in which a simultaneous communication state occurs in the second embodiment. At T1401, the terminal device 110 is controlled to a broadcast reception state in S611 and receives data from the base station device 120B via 2CA broadcast communication. At T1402, when a unicast communication request occurs in the terminal device 110, the terminal device 110 determines in S615 that a unicast communication request has been made. At T1403, the terminal device 110 determines that the base station devices 120A and 120B belong to different networks, and transmits a broadcast resource notification of S1203 to the base station device 120A.

[0098] At T1404, if the base station device 120A determines that there is a broadcast resource notification at S1301, it adjusts the radio resources for unicast communication at S1303. Specifically, the base station device 120A transmits to the terminal device 110 a resource allocation instruction for unicast communication corresponding to 3CA obtained by subtracting 2CA indicated in the broadcast resource notification from 5CA, which is the maximum terminal capability.

[0099] The terminal device 110 that received the resource allocation instruction in T1405 is controlled to a simultaneous communication state in S631. As a result, the terminal device 110 simultaneously executes 2CA broadcast communication with the base station device 120B and 3CA unicast communication with the base station device 120A. The terminal device 110 simultaneously executes broadcast communication and unicast communication using radio resources that do not exceed the terminal's maximum capability, thereby preventing communication from becoming unavailable.

[0100] 14B is a time chart of an example in which the simultaneous communication state is terminated in the second embodiment. At T1411, the terminal device 110 is controlled to the simultaneous communication state in the same manner as at T1405. At T1412, when a broadcast disconnection request occurs in the terminal device 110, the terminal device 110 determines in S635 that there is a broadcast disconnection request. At T1413, the terminal device 110 transmits the broadcast disconnection notification of S637 to the base station device 120A.

[0101] At T1414, if the base station device 120A determines in S1305 that there is a broadcast disconnection notification, it transmits in S705 to the terminal device 110 a resource allocation instruction for unicast communication corresponding to the terminal's maximum capability of 5CA. Having received the resource allocation instruction in T1415, the terminal device 110 is controlled to a unicast communication state in S621. As a result, the terminal device 110 transmits and receives high-speed, large-capacity data to and from the base station device 120A by unicast communication of the terminal's maximum capability of 5CA.

[0102] In the above embodiment, the broadcast resource notification may be transmitted and received independently, or may be transmitted and received together with other information. For example, the terminal device 110 may transmit the broadcast resource notification to the base station device 120 by including it in a message (UE Capability message) for notifying the network of capability information of the terminal device 110.

[0103] The broadcast resource notification may also be the above-mentioned UE Capability message. In this case, the terminal device 110 normally transmits a UE Capability message including capability information of the terminal's maximum capability (for example, 5CA). When a simultaneous communication state occurs, the terminal device 110 transmits a UE Capability message including capability information of limited terminal capability (for example, 3CA) as the broadcast resource notification in S1203 and S1213. The limited terminal capability is, for example, the terminal's maximum capability (for example, 5CA) minus the radio resources for broadcast communication (for example, 2CA).

[0104] In the second embodiment, the broadcast resource notification may include information indicating the frequency and band used in the broadcast communication. For example, when communication carriers A and B use unlicensed bands, the frequencies and bands used by communication carriers A and B may overlap. Therefore, by transmitting a broadcast resource notification indicating the frequency and band of the broadcast communication from terminal device 110, base station device 120 can perform unicast communication without overlapping the frequency and band with the broadcast communication.

[0105] Furthermore, when a simultaneous communication state occurs, the terminal device 110 may transmit a broadcast resource notification indicating the radio resources currently being used for broadcast communication periodically or whenever the broadcast communication state changes. In this case, the base station device 120 may adjust the radio resources for unicast communication in the same manner as in S1303 each time it receives a broadcast resource notification.

[0106] For example, when the number of CAs in ongoing broadcast communication is changed from 2 CAs to 3 CAs, the terminal device 110 transmits a broadcast resource notification indicating 3 CAs. Based on this broadcast resource notification, the base station device 120 can change the number of CAs in unicast communication from 3 CAs to 2 CAs in real time. In this case, the broadcast disconnection notification of S637 may be a broadcast resource notification indicating that the radio resources for broadcast communication are zero (for example, the number of CAs is zero).

[0107] Third Embodiment The third embodiment of the present disclosure will be described, focusing on differences from the first embodiment. The third embodiment differs from the first and second embodiments in the processing executed in the communication system 100. Figure 15 is a flowchart of processing executed in the base station device 120 according to the third embodiment.

[0108] 15, when it is determined in S1501 that a unicast communication request has occurred, the control unit 501 determines in S1503 whether broadcast transmission is in progress. If the base station device 120 is not transmitting data by broadcast communication, the control unit 501 determines in S1503 that broadcast transmission is not in progress. In this case, in S1505, the control unit 501 performs unicast communication using the wireless resources of the terminal's maximum capability. Thereafter, the control unit 501 returns the process to S1503.

[0109] For example, suppose that the base station device 120 receives a unicast communication request from the terminal device 110 when it is not transmitting data by broadcast communication. In this case, by executing S1505, the base station device 120 transmits and receives high-speed, large-volume data to and from the destination terminal device 110 by unicast communication at 5CA, which is the terminal's maximum capability.

[0110] On the other hand, in S1503, if the base station device 120 is transmitting data by broadcast communication, the control unit 501 determines that broadcast transmission is in progress. In this case, in S1507, the control unit 501 adjusts the radio resources for unicast communication based on the resource allocation information, as in S707.

[0111] For example, suppose that while the base station device 120 is transmitting data through 2CA broadcast communication, it receives a unicast communication request from the terminal device 110. In this case, by executing S1507, the radio resources for unicast communication are adjusted to 3CA, which is the terminal's maximum capability of 5CA minus the 2CA for broadcast communication.

[0112] At this time, if the terminal device 110, which is the counterpart of the unicast communication, is not receiving data transmitted by broadcast communication from the base station device 120, this terminal device 110 is in a 3CA unicast communication state. On the other hand, if the terminal device 110, which is the counterpart of the unicast communication, is receiving data transmitted by broadcast communication from the base station device 120, this terminal device 110 is in a simultaneous communication state of 3CA unicast communication and 2CA broadcast communication.

[0113] Next, the control unit 501 determines whether the broadcast transmission has ended in S1509. If the base station device 120 has ended data transmission by broadcast communication, the control unit 501 determines in S1509 that the broadcast transmission has ended. In this case, the control unit 501 transitions the process to S1505. This returns the state to one in which unicast communication is performed between the terminal device 110 and the base station device 120 using the terminal's maximum capacity radio resources. Note that if the control unit 501 determines in S1509 that the broadcast transmission has not ended, the process returns to S1509.

[0114] According to the communication system 100 of the third embodiment, when a unicast communication request occurs in the base station device 120 that performs broadcast communication, adjustments are made to limit the radio resources used for the unicast communication, regardless of whether the terminal device 110 at the other end of the unicast communication is receiving the broadcast. This allows the base station device 120 to prevent the terminal device 110 from becoming unable to communicate due to the occurrence of a simultaneous communication state, without the terminal device 110 needing to notify the base station device 120.

[0115] <Notes> The present disclosure is not limited to the above embodiments, and may be replaced with a configuration that is substantially the same as the configuration shown in the above embodiments, a configuration that has the same effect, or a configuration that can achieve the same purpose.

[0116] In the above-described first to third embodiments, the case where the one-to-one communication is unicast communication and the one-to-multiple communication is broadcast communication has been exemplified, but this is not limiting. For example, the one-to-multiple communication may be multicast communication that can be performed even when the terminal device 110 is in an idle state (RRC Idle). In such multicast communication, even if the terminal device 110 receives data when in an idle state (RRC Idle), it does not transmit feedback to the base station device 120.

[0117] Therefore, the base station device 120 cannot recognize whether the terminal device 110 in idle state is performing multicast communication. When a simultaneous communication state of multicast communication and unicast communication occurs, the base station device 120 may allocate radio resources that exceed the maximum capacity of the terminal. However, according to the above embodiment, when such a simultaneous communication state occurs, the radio resources for unicast communication are limited, thereby preventing the terminal device 110 from becoming unable to communicate.

[0118] The present disclosure is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment.

[0119] [Additional Notes] A terminal device according to one aspect of the present disclosure includes a one-to-one communication processing unit that performs processing related to one-to-one communication in which one base station device and one terminal device communicate wirelessly, a one-to-many communication processing unit that performs processing related to one-to-many communication in which one base station device and multiple terminal devices communicate wirelessly, and a notification processing unit that notifies the base station device with which the one-to-one communication is being performed of information for adjusting the wireless resources used for the one-to-one communication in accordance with the data reception status of the one-to-many communication. A terminal device according to one embodiment of the present disclosure includes a unicast communication processing unit that performs processing related to unicast communication performed with an NR base station device when in an RRC CONNECTED state, a broadcast communication processing unit that performs processing related to broadcast communication performed with an NR base station device when in either the RRC CONNECTED state or the RRC IDLE state, and a notification processing unit that notifies the NR base station device with which the unicast communication is performed of information for adjusting the radio resources used for the unicast communication depending on the data reception status of the broadcast communication. A base station device according to one aspect of the present disclosure includes a wireless communication unit capable of performing one-to-one communication in which one base station device and one terminal device communicate wirelessly, and one-to-many communication in which one base station device and multiple terminal devices communicate wirelessly, and a control unit capable of controlling the one-to-one communication and the one-to-many communication, wherein when the control unit is notified by the terminal device of information for adjusting the wireless resources used for the one-to-one communication, the control unit adjusts the wireless resources used for the one-to-one communication so that the sum of the wireless resources used for the one-to-one communication and the wireless resources used for the one-to-many communication is within the wireless resources available at the maximum capacity of the terminal device, and the wireless communication unit performs the one-to-one communication with the terminal device using the wireless resources adjusted by the control unit. [Explanation of symbols]

[0120] 110 terminal device, 120 base station device, 401 one-to-one communication processing unit, 402 one-to-multiple communication processing unit, 403 notification processing unit, 501 control unit, 502 wireless communication unit

Claims

1. a unicast communication processing unit that performs processing related to unicast communication; a broadcast communication processing unit that performs processing related to broadcast communication; a communication processing unit that, when the broadcast communication is executed with a base station device, notifies the base station device of information indicating a radio resource for the broadcast communication; A terminal device comprising:

2. a wireless communication unit capable of performing unicast communication and broadcast communication; a control unit capable of controlling the unicast communication and the broadcast communication, The control unit a function of receiving information indicating radio resources for the broadcast communication from a terminal device, and a function of determining radio resources to be used in the unicast communication; The wireless communication unit a function of performing the unicast communication with the terminal device using the radio resource determined by the control unit; Base station equipment.

3. A unicast communication processing unit that performs processing related to unicast communication performed with the NR base station device when in an RRC CONNECTED state; A broadcast communication processing unit that performs processing related to broadcast communication executed with an NR base station device when the RRC is in either the RRC CONNECTED state or the RRC IDLE state; a notification processing unit that notifies the NR base station device that performs the unicast communication of information indicating a radio resource for the broadcast communication when the broadcast communication is performed with the NR base station device; Equipped with In a simultaneous communication state of the broadcast communication and the unicast communication, the unicast communication is performed using radio resources based on an allocation instruction of the NR base station device. Terminal device.

4. a wireless communication unit capable of performing unicast communication and broadcast communication; a control unit capable of controlling the unicast communication and the broadcast communication, the control unit determines a radio resource to be used in the unicast communication when information indicating a radio resource for the broadcast communication is notified from a terminal device; the wireless communication unit performs the unicast communication with the terminal device using the wireless resource determined by the control unit; the information indicates that data reception by the broadcast communication is to be executed in the terminal device, the wireless communication unit performs the broadcast communication with the terminal device using predetermined wireless resources, and performs the unicast communication with the terminal device using wireless resources determined by the control unit. Base station equipment.

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