WO2018185995A1

WO2018185995A1 - Base station device, terminal device, control method, and program

Info

Publication number: WO2018185995A1
Application number: PCT/JP2018/001170
Authority: WO
Inventors: 大関　武雄; 恭宏末柄
Original assignee: Kddi株式会社
Priority date: 2017-04-03
Filing date: 2018-01-17
Publication date: 2018-10-11
Also published as: JP2018182359A

Abstract

A base station device that selects an individual wireless resource or a shared wireless resource, for notification of control information pertaining to preemption, when using some wireless resources already allocated to a plurality of terminal devices and transmitting (preempting) data to a URLLC terminal device during communications with a plurality of eMBB terminal devices. The base station device uses the wireless resource selected from either an individual wireless resource or a shared wireless resource and notifies a terminal device of control information pertaining to preemption.

Description

Base station apparatus, terminal apparatus, control method, and program

The present invention relates to a radio resource allocation technique for a radio communication system.

In the 3rd Generation Partnership Project (3GPP), the standardization of the 5th generation cellular communication system called New Radio (NR) is now underway. NR is expected to support not only high-speed and large-capacity communication (eMBB: enhanced Mobile Broadband) but also high-reliability and low-latency communication (URLLC: Ultra-Reliable and Low Low Latency Communications). In particular, in order to implement URLLC in the downlink, a mechanism called preemption, in which URLLC interrupts during eMBB communication, has been studied (see Non-Patent Documents 1 and 2).

In preemption, the reception performance of the eMBB terminal apparatus is affected by thinning out data transmitted to the eMBB terminal apparatus. For this reason, it has been studied to notify control information related to preemption from the base station apparatus to the eMBB terminal apparatus (see Non-Patent Document 1). However, when preemption is performed using radio resources allocated to a plurality of terminal devices for eMBB, if control information is notified from the base station device for each terminal device, the radio resources are wasted for the notification. The frequency utilization efficiency decreases.

The present invention has been made in view of the above-described problems. The present invention provides a technique for enabling control information to be collectively notified to a plurality of terminal devices when preemption is performed using radio resources allocated to the plurality of terminal devices. It is an object.

A base station apparatus according to an aspect of the present invention uses a part of radio resources in radio resources already allocated to the first and second terminal apparatuses during communication with the first and second terminal apparatuses. Determining means for performing transmission processing for transmitting data addressed to the third terminal device, and transmitting data to the third terminal device according to the determination by the determining means, using the partial radio resource Transmission means, individual radio resources that can be demodulated by the first and second terminal apparatuses, and common radio that can be demodulated in common by both the first and second terminal apparatuses And notifying means for notifying the first and second terminal devices of control information related to the transmission processing using any one of the radio resources.

A terminal apparatus according to an aspect of the present invention includes a storage unit that receives data from the base station apparatus using radio resources allocated from the base station apparatus, and stores the received data in a storage unit; Relevant to the transmission process that is notified from the base station apparatus when a process of transmitting data to another terminal apparatus is performed using a part of the radio resources already allocated to the apparatus In order to receive control information, an individual radio resource that can be demodulated by the terminal apparatus and a common radio resource that can be demodulated in common by a plurality of terminal apparatuses including the terminal apparatus. For both, receiving means for trying to receive the control information, and demodulating the data stored in the storage means according to the control information received by the receiving means And having cormorants and demodulating means.

According to the present invention, when preemption is performed using radio resources allocated to a plurality of terminal devices, control information can be collectively notified to the plurality of terminal devices.

Other features and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings. In the accompanying drawings, the same or similar components are denoted by the same reference numerals.

The accompanying drawings are included in the specification, constitute a part thereof, show an embodiment of the invention, and are used to explain the principle of the invention together with the description.

The figure which shows the structural example of a radio | wireless communications system The figure which shows the example of the interruption with respect to the communication with the terminal device for eMBB The block diagram which shows the hardware structural example of a base station apparatus and a terminal device Block diagram showing a functional configuration example of the base station apparatus Block diagram showing a functional configuration example of a terminal device The flowchart which shows the procedure of the process performed by the base station apparatus. The figure which shows the example of transmission of the control information relevant to preemption The figure which shows the example of transmission of the control information relevant to preemption The figure which shows the example of transmission of the control information relevant to preemption The figure which shows the example of transmission of the control information relevant to preemption The figure which shows the production | generation example of the control information corresponding to the radio | wireless resource used The figure which shows the production | generation example of the control information corresponding to the radio | wireless resource used The flowchart which shows the procedure of the process performed by the terminal device for eMBB. The figure which shows the example of transmission of the control information relevant to preemption when MU-MIMO is used The figure which shows the example of transmission based on the operation state of the terminal device of the control information relevant to preemption The figure which shows the example of transmission based on the operation state of the terminal device of the control information relevant to preemption

Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the following drawings, components that are not necessary for the description of the embodiments are omitted from the drawings.

[First Embodiment]
<System configuration>
FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to the first embodiment. The radio communication system according to the present embodiment includes a base station apparatus 10 that forms a cell 100 and a plurality of terminal apparatuses 11 to 13. In the example of FIG. 1, three terminal apparatuses 11 to 13 exist in the cell 100 formed by the base station apparatus 10, but any number of terminal apparatuses may exist in the cell 100.

Communication between the base station apparatus 10 and the terminal apparatuses 11 to 13 is performed using radio resources allocated to the terminal apparatuses 11 to 13 by the base station apparatus 10. The base station apparatus 10 allocates radio resources for each of uplink communication in the direction from the terminal apparatuses 11 to 13 to the base station apparatus 10 and downlink communication in the direction from the base station apparatus 10 to the terminal apparatuses 11 to 13. Do. The radio resources to be allocated are specified by, for example, time and frequency, and may be further specified by space (spatial layer) when spatial multiplexing is used.

In the present embodiment, the

terminal devices

11 and 12 are examples of a terminal device (first terminal device) that performs high-speed and large-capacity communication (eMBB), and the terminal device 13 is a highly reliable and low-delay communication (URLLC). ) Is an example of a terminal device (second terminal device). The terminal devices 11 to 13 can be mobile devices such as smartphones and tablet terminals. In addition, since services such as automatic driving and telemedicine can be assumed for the URLLC service, the terminal device 13 may be, for example, an automobile (a communication device installed in an automobile).

When the base station device 10 starts communication with the terminal device for URLLC (for example, the terminal device 13) during communication with the terminal device for eMBB (for example, the terminal devices 11 and 12), the base station device 10 has already been assigned to the terminal device for eMBB. In some cases, a part of the allocated radio resource is used to communicate with the terminal device for URLLC (that is, the communication with the terminal device for URLLC is interrupted to the communication with the terminal device for eMBB).

Here, FIG. 2 is a diagram illustrating an example of an interrupt for communication with an eMBB terminal device, and a terminal device that is a URLLC terminal device during communication with the terminal device 11 that is an eMBB terminal device. 13 shows an example in which an interruption is performed by communication with the communication device 13. In the example of FIG. 2, the base station apparatus 10 assigns radio resources 20 to the terminal apparatuses 11 by scheduling data transmission to the terminal apparatuses 11, and uses the radio resources 20 to transmit data to the terminal apparatuses 11. Start sending. The scheduling result is reported from the base station apparatus 10 to the terminal apparatus 11 as scheduling information 21. The notification of the scheduling information 21 is not limited to the area illustrated in FIG. 2 in the time-frequency domain, and may be performed using radio resources in other areas. Thereafter, when a request for communication with the terminal device 13 occurs during communication with the terminal device 11, the base station device 10 uses a part of the radio resources 25 in the radio resource 20 allocated to the terminal device 11. The data is transmitted to the terminal device 13. Note that the base station apparatus 10 notifies the terminal apparatus 13 of the scheduling information 26 related to the data transmission using a radio resource having a frequency different from that of the radio resource 20 before starting the data transmission. The notification of the scheduling information 26 is not limited to the area shown in FIG. 2 in the time-frequency domain, and may be performed using radio resources in other areas.

The base station apparatus 10 can start communication with the URLLC terminal apparatus (terminal apparatus 13) in a short time by the interrupt processing as described above for communication with the eMBB terminal apparatus (terminal apparatus 11). In the present embodiment, an interrupt process for communication with an eMBB terminal device (terminal device 11) is realized by a mechanism called preemption. Preemption is a transmission process in which data addressed to an eMBB terminal device (first terminal device) is replaced with data addressed to a URLLC terminal device (second terminal device), and the data is transmitted to the URLLC terminal device. Equivalent to.

As described above, preemption may degrade the reception performance of the eMBB terminal device due to puncturing of data transmitted to the eMBB terminal device. For this reason, it may be necessary to notify the control information related to preemption from the base station apparatus 10 to the eMBB terminal apparatus so that the demodulation process can be appropriately performed in the eMBB terminal apparatus. However, when preemption is performed using radio resources allocated to a plurality of terminal devices for eMBB (that is, radio resources in a region extending over a plurality of radio resources corresponding to different terminal devices), each terminal device When the control information is notified to, the radio resource is wasted for the notification, and the frequency use efficiency is lowered.

Therefore, in the present embodiment, when preemption is performed using radio resources allocated to a plurality of terminal devices for eMBB, control information can be collectively notified to the plurality of terminal devices. To do. Specifically, the base station apparatus 10 uses a part of radio resources allocated to the plurality of terminal apparatuses during communication with the plurality of terminal apparatuses (terminal apparatuses 11 and 12) for eMBB. When preemption is performed, for notification of the corresponding control information, individual radio resources that can be individually demodulated by each terminal device and the plurality of terminal devices all perform demodulation in common Use one of the common radio resources possible. Furthermore, the base station apparatus 10 notifies the control information related to preemption to a plurality of terminal apparatuses using any one of the dedicated radio resource and the common radio resource.

In this way, not only individual radio resources but also common radio resources can be used for transmission of control information related to preemption, so that control information is collectively notified to a plurality of terminal devices for eMBB. It becomes possible to do. Below, the structural example of the base station apparatus 10 and the terminal device 11 for implement | achieving the above processes and the example of the process performed by each apparatus are demonstrated.

<Device configuration>
FIG. 3 is a block diagram illustrating a hardware configuration example of the base station device and the terminal device. The base station device 10 and the terminal device 11 have a hardware configuration as shown in FIG. 3 and include, for example, a CPU 31, a ROM 32, a RAM 33, an external storage device 34, and a communication device 35. The

terminal devices

12 and 13 can have the same configuration as the terminal device 11.

In the base station device 10 and the terminal device 11, for example, the CPU 31 executes a program for realizing each function of the base station device 10 and the terminal device 11 stored in any of the ROM 32, the RAM 33, and the external storage device 34. The CPU 31 may be replaced by one or more processors such as an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), and a DSP (Digital Signal Processor).

The base station device 10 (terminal device 11) controls the communication device 35 by the CPU 31, for example, and performs communication with the terminal device 11 (base station device 10). In FIG. 2, the base station device 10 and the terminal device 11 are illustrated as having one communication device 35, but are not limited thereto. For example, the terminal device 11 may have two or more communication devices 35 to communicate with two or more base station devices, and further, another communication device 35 for communication in another system. You may have.

Note that the base station apparatus 10 and the terminal apparatus 11 may include dedicated hardware for executing each function, or a part of the base station apparatus 10 and the terminal apparatus 11 may be executed by the hardware and the other part may be executed by a computer that operates the program. Also good. All functions may be executed by a computer and a program.

FIG. 4 is a block diagram illustrating a functional configuration example of the base station apparatus. Each function of the base station apparatus 10 is a logical function realized by, for example, the hardware of FIG. 3 and can be realized by the CPU 31 executing a program stored in the ROM 32 or the like. In the present embodiment, the base station apparatus 10 includes a wireless communication unit 41, a scheduling unit 42, a data transmission unit 43, and a notification transmission unit 44.

The wireless communication unit 41 transmits and receives wireless signals to and from terminal devices such as the terminal devices 11 to 13 by communication according to the cellular communication standard. The scheduling unit 42 performs scheduling of uplink communication and downlink communication with each terminal device. Hereinafter, only downlink communication will be described. Scheduling may be performed for each scheduling period (eg, TTI (Transmission Time Interval) in Long Term Evolution (LTE)). Further, one or more slots (or subframes) may be transmitted within a corresponding scheduling period by one scheduling.

The scheduling unit 42, when performing downlink data transmission to the URLLC terminal device (terminal device 13), has already been assigned to one or more terminal devices (terminal devices 11, 12) for eMBB. Scheduling of data transmission (interrupt processing) using a part of can be performed. This data transmission is realized by preemption as described above.

The data transmission unit 43 performs data transmission to each terminal device via the wireless communication unit 41 according to the scheduling result by the scheduling unit 42. The notification transmission unit 44 transmits control information related to preemption (control information related to interrupt processing) to the eMBB terminal device affected by the interrupt processing via the wireless communication unit 41. At that time, the notification transmission unit 44 uses either an individual radio resource or a common radio resource as a radio resource (control channel) for transmitting control information in accordance with a criterion described in detail below. The dedicated radio resource is a radio resource that can be demodulated only by an individual terminal device, and the common radio resource is a radio resource that can be demodulated in common by a plurality of terminal devices. Examples of common radio resources include multicast radio resources that can be demodulated only by a plurality of grouped terminal devices, and broadcast radio resources that can be demodulated by all terminal devices. There is.

FIG. 5 is a block diagram illustrating a functional configuration example of the terminal device. Each function of the terminal device 11 is a logical function realized by, for example, the hardware of FIG. 3 and can be realized by the CPU 31 executing a program stored in the ROM 32 or the like. In the present embodiment, the terminal device 11 includes a wireless communication unit 51, a data reception unit 52, a data storage unit 53, a notification reception unit 54, and a demodulation processing unit 55.

The wireless communication unit 51 transmits / receives a wireless signal to / from a base station device such as the base station device 10 by communication according to the cellular communication standard. The data receiving unit 52 receives scheduling information from the base station device via the wireless communication unit 51, and uses the radio resource allocated by the base station device according to the received scheduling information from the base station device. Receive data. Data received by the data receiving unit 52 is stored in the data storage unit 53. When the data reception unit 52 receives data from the base station apparatus for each scheduling period, the data reception unit 52 accumulates the received data in the data storage unit 53.

The notification receiving unit 54 receives control information notified from the base station device (notification transmission unit 44) from the base station device via the wireless communication unit 51 when the above-described interrupt processing (preemption) is performed. . When receiving data from the base station apparatus, the notification receiving unit 54 monitors radio resources (control channels) used for control information notification so that control information notification can be received. Specifically, the notification receiving unit 54 attempts to receive control information by monitoring both the individual radio resource and the common radio resource described above. When the control information is received by the notification receiving unit 54, the demodulation processing unit 55 performs a demodulation process on the data stored in the data storage unit 53 for each scheduling period according to the control information.

<Processing procedure of base station device>
FIG. 6 is a flowchart illustrating a procedure of processing executed by the base station apparatus. When a request for data transmission to the terminal device for URLLC occurs during communication with the terminal device for eMBB, the base station device 10 of the present embodiment executes processing according to the procedure of FIG. Here, a case will be described as an example where a request for data transmission to the URLLC terminal device 13 occurs during communication with a plurality of eMBB terminal devices 11 and 12 (first and second terminal devices).

7A, FIG. 7B, FIG. 8A, and FIG. 8B, data is transmitted to the terminal device 13 by preemption using a part of the wireless resources (wireless resource 731) that is already allocated to the

terminal devices

11 and 12. It is a figure which shows the example of transmission of the control information relevant to preemption in the case of being performed. 7A and 7B show an example in which control information is transmitted using a common radio resource (radio resource 740), and FIGS. 8A and 8B show that individual radio resources (radio resources 741, 742) are used. An example in which control information is transmitted is shown. Note that the time positions, frequency positions, and sizes of the radio resources 740 to 742 used for transmission of control information shown in FIGS. 7A, 7B, 8A, and 8B are merely examples, and are based on the cellular communication standard. It is possible to determine arbitrarily according to this. 7A, FIG. 7B, FIG. 8A, and FIG. 8B show an example in which the radio resources allocated to a plurality of terminal devices are adjacent in the frequency direction between the terminal devices. It does not have to be.

First, in S61, the base station apparatus 10 schedules data transmission to the terminal apparatus 13. In this example, as shown in FIG. 7A, radio resources 731 in a part of the

radio resources

711 and 721 allocated to the

terminal apparatuses

11 and 12 and continuous areas extending over the

radio resources

711 and 721 are obtained. Assume that the data transmission used is scheduled. That is, in S61, the base station apparatus 10 uses some radio resources 731 in the

radio resources

711 and 721 already allocated to the plurality of terminal apparatuses during communication with the plurality of

terminal apparatuses

11 and 12. Then, it is determined to perform transmission processing (preemption) for transmitting data addressed to the terminal device 13.

Next, in S62, the base station apparatus 10 transmits data to the terminal apparatus 13 by preemption according to the scheduling result in S61. Specifically, in the radio resource 731, the base station apparatus 10 thins out the data addressed to the

terminal apparatuses

11 and 12 and replaces it with data addressed to the terminal apparatus 13, and transmits data addressed to the terminal apparatus 13. Further, in S63, the base station apparatus 10 selects an individual radio resource or a common radio resource as a radio resource for transmitting control information related to the preemption performed in S62.

In the present embodiment, the base station apparatus 10 aligns whether the timing for completing data transmission scheduled for the terminal apparatus 11 and the timing for completing data transmission scheduled for the terminal apparatus 12 are aligned. Determine whether. This determination is made based on a scheduling result (scheduling information 712, 722) of data transmission to the

terminal apparatuses

11, 12. As illustrated in FIG. 7A, the base station device 10 selects a common radio resource when the data transmission completion timing is aligned between the terminal device 11 and the terminal device 12. On the other hand, as shown in FIG. 8A, the base station apparatus 10 selects an individual radio resource when the data transmission completion timing is not aligned between the terminal apparatus 11 and the terminal apparatus 12.

If the control information is transmitted using the common radio resource when the data transmission completion timing is not aligned, there is a possibility that the demodulation processing in the terminal device (terminal device 12 in FIG. 8A) that has completed communication may be delayed. There is. According to the selection process described above, since the individual radio resource is used when the data transmission completion timing is not aligned, it is possible to prevent such a delay in the demodulation process from occurring. In addition, when the data transmission completion timing is aligned, the control information addressed to a plurality of terminal devices can be transmitted at a time by transmitting the control information using the common radio resource. Thereby, waste of radio resources can be prevented and frequency use efficiency can be improved.

Here, an example of a method for collectively transmitting control information addressed to a plurality of terminal devices will be described with reference to FIGS. 7A, 7B, 9A, and 9B. The base station apparatus 10 includes information indicating the radio resource 731 on which preemption is performed in the control information. As information indicating the radio resource 731 as illustrated in FIG. 7A, for example, area information indicating the start point of the area (target area) in which the radio resource 731 is arranged and the size (in the time direction and the frequency direction) are included in the control information. It is done.

Specifically, as shown in FIG. 9B, information indicating the starting point a of the target region, the size b in the frequency direction, and the size c in the time direction is generated as region information. In the case of FIG. 9B, as shown in FIG. 9A, the area information is separately obtained for the area belonging to the radio resource 711 assigned to the terminal apparatus 11 and the area belonging to the radio resource 721 assigned to the terminal apparatus 12 in the target area. The amount of information is smaller than when it is generated. In the case of FIG. 9A, the size c in the time direction of the target region, the starting point a1 of the region on the radio resource 711 side and the size b1 in the frequency direction, the starting point a2 of the region on the radio resource 721 side, and the size b2 in the frequency direction Is generated as region information. As shown in FIG. 9B, by including region information having a smaller amount of information in the control information and transmitting the control information collectively to the

terminal apparatuses

11 and 12 using the common radio resource, the frequency utilization efficiency is improved. It is possible to increase.

FIG. 7B shows a case where preemption is performed in units of OFDM symbols (that is, the radio resource 731 occupies an area in units of OFDM symbols). In this case, the base station apparatus 10 may include, for example, only information indicating the OFDM symbol corresponding to the radio resource 731 (for example, the OFDM symbol number or index) in the control information as region information. Also in this case, since the information amount of the control information is small, it is possible to improve the frequency utilization efficiency by transmitting the control information to the

terminal devices

11 and 12 collectively using a common radio resource. .

As shown in FIG. 8B, in the radio resource 711 assigned to the terminal device 11, the area (radio resource 731 a) used for data transmission to the terminal device 13 and the radio resource 721 assigned to the terminal device 12 There may be a case where the area (wireless resource 731b) used for data transmission to the terminal device 13 is not continuous. That is, preemption may be performed with independent radio resources between the

terminal apparatuses

11 and 12, such as the radio resource 731a and the radio resource 731b. In such a case, as shown in FIG. 8B, the base station apparatus 10 may select individual radio resources (radio resources 741 and 742) instead of the common radio resources in S63.

Thereafter, when data transmission to the

terminal apparatuses

11 and 12 using the

radio resources

711 and 721 is completed, the base station apparatus 10 uses the radio resource selected in S63 for control information related to preemption in S64. To the

terminal devices

11 and 12.

Specifically, when the base station apparatus 10 selects the common radio resource, as shown in FIGS. 7A and 7B, the base station apparatus 10 sets the radio resource 740 according to the completion of data transmission to the

terminal apparatuses

11 and 12. The control information addressed to the

terminal devices

11 and 12 is transmitted. On the other hand, when the individual radio resource is selected, the base station apparatus 10 uses the radio resource 741 in response to the completion of data transmission to the terminal apparatus 11 as illustrated in FIGS. 8A and 8B. Send control information to the destination. Furthermore, in response to the completion of data transmission to the terminal device 12, control information addressed to the terminal device 12 is transmitted using the radio resource 742. Thereafter, the base station apparatus 10 ends the process.

<Processing procedure of terminal device>
FIG. 10 is a flowchart illustrating a procedure of processing executed by the eMBB terminal device. When receiving the scheduling information (scheduling information 712 in FIG. 7A and FIG. 7B) from the base station apparatus 10, the terminal device 11 executes processing according to the procedure in FIG. Here, the terminal apparatus 11 will be described, but the terminal apparatus 12 can also perform the same processing when receiving scheduling information (scheduling information 722 in FIGS. 7A and 7B) from the base station apparatus 10.

First, in S101, the terminal apparatus 11 receives data from the base station apparatus 10 using the radio resource 711 allocated by the base station apparatus 10 according to the received scheduling information 712. Further, in S102, the terminal apparatus 11 accumulates the reception data in the scheduling period corresponding to the scheduling information 712 in the data storage unit 53.

After that, in S103, the terminal apparatus 11 attempts to receive control information for both the dedicated radio resource and the common radio resource, which are radio resources (control channels) used for control information notification, and receives control information from the base station apparatus 10. Is received. If the control information is received, the terminal apparatus 11 advances the process to S104, performs the demodulation process of the data stored in the data storage unit 53 according to the received control information, and ends the process. In this case, the terminal apparatus 11 can perform demodulation processing by thinning out the data received using the radio resource indicated by the received control information. On the other hand, when the control information is not received, the terminal apparatus 11 advances the processing to S105, performs normal demodulation processing on the data stored in the data storage unit 53, and ends the processing.

As described above, according to the present embodiment, when preemption is performed using radio resources allocated to a plurality of

terminal apparatuses

11 and 12, control information for the plurality of

terminal apparatuses

11 and 12 is provided. Can be notified at once. Thereby, waste of radio resources can be prevented and frequency use efficiency can be improved.

[Second Embodiment]
In the second embodiment, an example is described in which preemption is performed for data transmission to a terminal device for URLLC when radio resources are allocated to the terminal device for eMBB by multi-user MIMO (MU-MIMO). To do. Below, description is abbreviate | omitted about the part which is common in 1st Embodiment, and a different part is demonstrated.

FIG. 11 is a diagram illustrating a transmission example of control information related to preemption according to the present embodiment. In this example, the communication with the terminal device 11 and the communication with the terminal device 12 are multiplexed (spatial multiplexed) in different spatial layers by MU-MIMO, that is, radio resources in different spatial layers are transmitted to the

terminal device

11, 12 is assigned. The base station apparatus 10 transmits data addressed to the terminal apparatus 11 using the layer 1 radio resource 711, and transmits data addressed to the terminal apparatus 12 using the layer 2 radio resource 721. In the example of FIG. 11, the base station apparatus 10 uses a part of the radio resources (radio resource 731) already allocated to the

terminal apparatuses

11 and 12 while performing data transmission to the

terminal apparatuses

11 and 12. Thus, data is transmitted to the terminal device 13 by preemption. At this time, the time position and frequency position of the radio resource 731 to be preempted are the same between layers, and data transmission is performed without performing spatial multiplexing.

In this embodiment, the base station apparatus 10 can select an individual radio resource or a common radio resource as a radio resource for transmitting control information related to preemption (S63), as in the first embodiment. For example, the base station apparatus 10 can select an individual radio resource or a common radio resource based on whether or not the data transmission completion timing is aligned between the terminal apparatus 11 and the terminal apparatus 12. As a result, as in the first embodiment, when the data transmission completion timing is not aligned, it is possible to prevent a delay from occurring in the demodulation processing in the terminal device that has completed communication first among the

terminal devices

11 and 12. .

When the common radio resource is selected, the base station apparatus 10 notifies the

terminal apparatuses

11 and 12 of control information by transmission using radio resources of one spatial layer and applying transmission diversity. In the example of FIG. 11, the base station apparatus 10 uses a radio resource 740 that is a layer 1 common radio resource. Furthermore, the base station apparatus 10 transmits the control information addressed to the

terminal apparatuses

11 and 12 collectively by transmission to which transmission diversity is applied in the radio resource 740. Thereby, it is possible to improve the reception quality when the

terminal devices

11 and 12 receive the control information.

According to this embodiment, even when MU-MIMO is applied to a plurality of

terminal apparatuses

11 and 12, preemption is performed on a plurality of

terminal apparatuses

11 and 12 to which radio resources of different spatial layers are allocated. It becomes possible to notify related control information collectively. Thereby, waste of radio resources can be prevented and frequency use efficiency can be improved.

[Third Embodiment]
In 3rd Embodiment, when selecting the radio | wireless resource for transmission of the control information relevant to preemption, an individual radio | wireless resource or a common radio | wireless resource is based on the operation state of the terminal device for eMBB by a discontinuous reception (DRX) function. An example of selecting is described. Description of parts common to the first embodiment will be omitted, and different parts will be described.

12 and 13 are diagrams illustrating an example of transmission of control information related to preemption based on the operating state of the terminal apparatus according to the present embodiment. In the present embodiment, the

terminal apparatuses

11 and 12 have a DRX function that operates to receive data in the on state and not receive data in the off state. Moreover, the base station apparatus 10 may control switching of the operation state (on state or off state) of the

terminal apparatuses

11 and 12. Alternatively, the

terminal devices

11 and 12 may autonomously switch the operation state and feed back information indicating the operation state to the base station device 10. In any case, the base station device 10 can grasp the operation state (on state or off state) of the

terminal devices

11 and 12.

In the present embodiment, as shown in FIG. 12, the base station apparatus 10 performs the data transmission scheduled for the terminal apparatus 11 and the data transmission scheduled for the terminal apparatus 12 at timing t1. When both the

terminal devices

11 and 12 are in the on state, the common radio resource (radio resource 740) is selected. In the examples of FIGS. 12 and 13, it is assumed that the completion timing of data transmission to the terminal device 11 and the completion timing of data transmission to the terminal device 12 are not aligned. In this case, both the

terminal devices

11 and 12 can receive the control information by transmitting the control information using the radio resource 740 immediately after the data transmission is completed.

On the other hand, as shown in FIG. 13, the base station apparatus 10 receives the terminal apparatus 11 at the timing t1 when the data transmission scheduled for the terminal apparatus 11 and the data transmission scheduled for the terminal apparatus 12 are completed. , 12 is in an off state, the individual radio resources (radio resources 741, 742) are selected. In the example of FIG. 13, the terminal device 12 transitions from the on state to the off state after the data transmission to the terminal device 12 is completed and before the data transmission to the terminal device 11 is completed. In this case, even if the control information is transmitted at the timing when the data transmission to the terminal device 11 is completed, the terminal device 12 cannot receive the control information. In such a case, the base station apparatus 10 transmits control information to each of the

terminal apparatuses

11 and 12 using the dedicated radio resource.

According to the present embodiment, it becomes possible to collectively notify the control information to the

terminal devices

11 and 12 according to the operation state of the

terminal devices

11 and 12. Thereby, waste of radio resources can be prevented and frequency use efficiency can be improved.

The present invention is not limited to the above embodiment, and various changes and modifications can be made without departing from the spirit and scope of the present invention. Therefore, in order to make the scope of the present invention public, the following claims are attached.

This application claims priority on the basis of Japanese Patent Application No. 2017-073529 filed on Apr. 3, 2017, the entire contents of which are incorporated herein by reference.

Claims

Transmission processing for transmitting data destined for the third terminal device using a part of the radio resources allocated to the first and second terminal devices during communication with the first and second terminal devices A decision means for deciding to perform
Transmitting means for transmitting data to the third terminal device according to the determination by the determining means using the part of the radio resources;
Either an individual radio resource that can be demodulated by each of the first and second terminal apparatuses, or a common radio resource that can be demodulated by both the first and second terminal apparatuses. A notification means for notifying the first and second terminal devices of control information related to the transmission processing using the radio resources;
A base station apparatus comprising:
The transmission means replaces data addressed to the first terminal device and data addressed to the second terminal device in the partial radio resource with data addressed to the third terminal device, and transmits the data to the third terminal device. The base station apparatus according to claim 1, wherein the base station apparatus transmits the base station apparatus.
The common radio resource is a radio resource that can be demodulated only by a plurality of grouped terminal devices, or a radio resource that can be demodulated by all terminal devices. Item 3. The base station apparatus according to Item 1 or 2.
In the case where the timing for completing the data transmission scheduled for the first terminal device and the timing for completing the data transmission scheduled for the second terminal device are not aligned, The base station apparatus according to any one of claims 1 to 3, wherein the common radio resource is used when the individual radio resource is used and aligned.
The first and second terminal devices have a intermittent reception (DRX) function that operates to receive data in an on state and not receive data in an off state;
The notification means includes
At the timing when the data transmission scheduled for the first terminal device and the data transmission scheduled for the second terminal device are completed, at least one of the first and second terminal devices is in the off state. If so, the individual radio resource is used, and when both the first and second terminal devices are in the on state, the common radio resource is used. The base station apparatus according to any one of 1 to 3.
The notification means includes: an area used for transmitting data to the third terminal apparatus in the radio resource allocated to the first terminal apparatus; and the third terminal apparatus in the radio resource allocated to the second terminal apparatus. The base station apparatus according to any one of claims 1 to 5, wherein the individual radio resource is used if a region used for data transmission to the network is not continuous.
The notification means includes
When performing the notification using the common radio resource, the data transmission scheduled for the first terminal apparatus and the data transmission scheduled for the second terminal apparatus are completed, Notifying the control information to the first and second terminal devices,
When the notification is performed using the individual radio resource, the control information is notified to the first terminal device upon completion of scheduled data transmission to the first terminal device, and the second The base station apparatus according to any one of claims 1 to 6, wherein the control information is notified to the second terminal apparatus upon completion of scheduled data transmission to the terminal apparatus.
The communication with the first terminal device and the communication with the second terminal device are spatially multiplexed in different spatial layers,
In the case where the notification means performs notification using the common radio resource, the control information is transmitted to the first and the second by using a radio resource of one spatial layer and applying transmission diversity. The base station apparatus according to any one of claims 1 to 7, wherein a notification is made to the second terminal apparatus.
When the data is transmitted to the third terminal device in units of OFDM symbols, the notification means includes information indicating the used OFDM symbols in the control information, and is not performed in units of OFDM symbols. In this case, the base station apparatus according to any one of claims 1 to 8, wherein information indicating an area in which used radio resources are arranged is included in the control information.
A terminal device,
Storage means for receiving data from the base station apparatus using radio resources allocated from the base station apparatus, and storing the received data in a storage means;
Related to the transmission processing, notified from the base station device when data transmission processing to another terminal device is performed using a part of the radio resources allocated to the terminal device In order to receive control information to be transmitted, individual radio resources that can be demodulated by the terminal device, and common radio resources that can be demodulated in common by a plurality of terminal devices including the terminal device, For both, receiving means for attempting to receive the control information;
Demodulating means for demodulating data stored in the storage means according to the control information received by the receiving means;
The terminal device characterized by having.
A control method for a base station apparatus,
Transmission processing for transmitting data destined for the third terminal device using a part of the radio resources allocated to the first and second terminal devices during communication with the first and second terminal devices A decision step for deciding to perform
A transmission step of transmitting data to the third terminal device according to the determination in the determination step using the part of the radio resources;
Either an individual radio resource that can be demodulated by each of the first and second terminal apparatuses, or a common radio resource that can be demodulated by both the first and second terminal apparatuses. A notification step of notifying the first and second terminal devices of control information related to the transmission process using the radio resources;
A control method characterized by comprising:
A terminal device control method,
An accumulation step of receiving data from the base station apparatus using radio resources allocated from the base station apparatus, and accumulating the received data in a storage unit;
Related to the transmission processing, notified from the base station device when data transmission processing to another terminal device is performed using a part of the radio resources allocated to the terminal device In order to receive control information to be transmitted, individual radio resources that can be demodulated by the terminal device, and common radio resources that can be demodulated in common by a plurality of terminal devices including the terminal device, For both, a receiving step that attempts to receive the control information;
A demodulation step of performing a demodulation process of data stored in the storage means according to the control information received in the reception step;
A control method characterized by comprising:
A program for causing a computer included in a base station apparatus to execute each step of the control method according to claim 11.
A program for causing a computer included in a terminal device to execute each step of the control method according to claim 12.