JP7236496B2 - BASE STATION DEVICE, PROGRAM AND CONTROL METHOD - Google Patents

Description

The present invention relates to a base station apparatus, program, and control method.

Patent Document 1 describes a method of using SPS (Semi-Persistent Scheduling) in Sidelink and notifying SPS-related parameters from the HO Source to the HO Target at the time of handover. Patent Literature 2 describes a technique for seamless handover when forming a vehicle group with Sidelink.
[Prior art documents]
[Patent Literature]
[Patent Document 1] Japanese Patent Publication No. 2019-525635 [Non-Patent Document]
[Non-Patent Document 1] Yen-Hsin Chang, He-Hsuan Liu, and Hung-Yu Wei, "Group-based Sidelink Communication for Seamless Vehicular Handover," IEEE Access, Volume 7, Page 56431 - 56442, May 2019

An embodiment of the present invention provides a base station apparatus. The base station apparatus may include an allocation control section that executes radio resource allocation control for user terminals. When the allocation control unit is executing allocation control for the user terminal using the first allocation scheme for dynamically allocating radio resources, the base station apparatus determines that the user terminal is to be handed over. and a method control unit that changes the allocation method used by the allocation control unit for the user terminal from the first allocation method to the second allocation method that allocates radio resources in advance.

The first allocation scheme may be Dynamic Scheduling. The second allocation scheme may be Semi-Persistent Scheduling. The second allocation scheme may be Configured Grant. The method control unit performs the allocation control in response to determining that the user terminal is to be handed over while the allocation control unit is executing allocation control for the user terminal using the first allocation method. section to change the allocation scheme for direct communication by the user terminal with another user terminal from the first allocation scheme to the second allocation scheme. The method control unit performs the allocation control in response to determining that the user terminal is to be handed over while the allocation control unit is executing allocation control for the user terminal using the first allocation method. part, the allocation method for communication by the user terminal via the base station remains the first allocation method, and the allocation method for direct communication by the user terminal with another user terminal is the first allocation method. method may be changed to the second allocation method. The method control unit selects the allocation method to be used by the allocation control unit for the user terminal from when the user terminal is determined to be handed over to when the handover command is transmitted to the user terminal. The first allocation method may be changed to the second allocation method. When the method control unit determines that the user terminal is to be handed over to a cell generated by another base station apparatus, the allocation method used by the allocation control unit for the user terminal is the first allocation method. to the second allocation method, and after the user terminal is handed over to the other base station device, the allocation method is changed from the second allocation method to the first allocation method. Notification data may be sent to notify that the

An embodiment of the present invention provides a base station apparatus. The base station apparatus may include an allocation control section that executes radio resource allocation control for user terminals. The base station apparatus, in the allocation control unit, uses a first allocation scheme for dynamically allocating radio resources to one user terminal as an allocation scheme for communication via the base station, while the one user terminal A method control unit may be provided that executes allocation control for one user terminal by using a second allocation method for pre-allocating radio resources as an allocation method for direct communication with other user terminals. The first allocation scheme may be Dynamic Scheduling, and the second allocation scheme may be Semi-Persistent Scheduling or Configured Grant.

According to one embodiment of the present invention, there is provided a program for causing a computer to function as the base station apparatus.

According to one embodiment of the present invention, a control method performed by a base station apparatus is provided. The control method may comprise performing radio resource allocation control for user terminals using a first allocation scheme for dynamically allocating radio resources to user terminals. The control method may comprise determining to handover the user terminal while performing allocation control for the user terminal using the first allocation scheme. The control method includes the step of changing the allocation method used for the user terminal from the first allocation method to the second allocation method for pre-allocating the radio resource, and executing allocation control of the radio resource for the user terminal. good.

According to one embodiment of the present invention, a control method performed by a base station apparatus is provided. The control method uses a first allocation scheme for dynamically allocating radio resources to one user terminal as an allocation scheme for communication via a base station, while allowing one user terminal to communicate with other user terminals. A method control step may be provided for executing allocation control for one user terminal using a second allocation method for pre-allocating radio resources as an allocation method for direct communication.

It should be noted that the above summary of the invention does not list all the necessary features of the invention. Subcombinations of these feature groups can also be inventions.

An example of a communication environment in system 1 is shown schematically. 1 schematically shows an example of a conventional control sequence for intra-base-station handover; An example of a control sequence during intra-base station handover in system 1 is schematically shown. An example of system 1 is shown schematically. An example of a control sequence during handover between base stations in system 1 is schematically shown. An example of the functional configuration of the base station apparatus 100 is shown schematically. An example of the hardware configuration of computer 1200 functioning as base station apparatus 100 is shown schematically.

In 3GPP NR-V2X Sidelink (SL, direct communication between terminals: D2D), two modes related to SL radio resource control are defined: base station range mode (SL Mode-1) and base station range mode (SL Mode-2). ing. In SL Mode-1, SL radio resource allocation is controlled by L1/L2 signaling from the base station. As a resource allocation method at that time, a scheduling method (for example, DS (Dynamic Scheduling)) that dynamically selects the number of resource blocks (RB) and RB allocation frequency each time data is generated is generally used. there is again. When a handover (HO) occurs during SL Mode-1 operation, signaling between the base station and the terminal follows the conventional HO sequence.

A certain terminal (UE: User Equipment) when HO occurs between cells or between base stations during SL Mode-1 operation, if DS is used in inter-terminal communication, HO processing from the timing of receiving the HO request is required to establish synchronization between the UE and the HO destination. Therefore, the base station cannot control allocation of radio resources to the UE. During the blank period, the UE cannot transmit and receive data including SL, and there is a problem that direct data transmission is temporarily cut off. When the UE is installed in a vehicle and performs communication between vehicles, direct data transmission between vehicles, such as surveillance videos, which is important for ensuring safety, may be temporarily cut off, so this is a particularly important issue. becomes.

In the system 1 according to the present embodiment, the base station apparatus 100 of the base station 10, for example, immediately before the UE performs HO, sets the SL radio resource allocation method for the UE in advance from the DS, the amount of resources and the frequency position. is determined (for example, SPS (Semi-Persistent Scheduling)). As a result, even in a state in which resources cannot be allocated from the base station until HO is completed, SL data transmission/reception can be continued, and data transmission by inter-terminal communication can be continued.

Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. Also, not all combinations of features described in the embodiments are essential for the solution of the invention.

FIG. 1 schematically shows an example of a communication environment in system 1. As shown in FIG. Here, a case where the UE is mounted in a vehicle will be mainly described as an example. The UE may be an in-vehicle device. The UE may be a separate device from the in-vehicle device. The UE may be mounted on a moving object other than a vehicle. The UE may be smart phones and tablet terminals.

In FIG. 1 , a UE 200 mounted on a preceding vehicle 20 and a UE 260 mounted on a following vehicle 26 are in direct communication under the control of the base station device 100 of the base station 10 . Communication between UE 200 and UE 260 may be so-called inter-vehicle communication. As mentioned above, DS is generally used as a resource allocation scheme.

In the conventional configuration, in a situation where the preceding vehicle 20 and the following vehicle 20 are in the cell 102, the preceding vehicle 20 and the following vehicle 26 move, the preceding vehicle 20 enters the range of the cell 104, and the UE 200 When performing HO from cell 102 to cell 104, it is necessary to newly establish synchronization with cell 104, which is the HO destination. During this time, data transmission and reception, including terminal-to-terminal communication using SL, cannot be performed only with DS.

As described above, in DS, there is a time zone in which allocation control cannot be performed during HO, so it is necessary to solve the problem of temporary disconnection of data transmission. Therefore, in the system 1 according to the present embodiment, the base station apparatus 100 uses the SPS during the period from the start to the completion of HO. In addition to SPS, Configured Grant defined in the 3GPP specifications may be used, and other methods may be used as long as data transmission can be continued autonomously even during HO. .

FIG. 2 schematically shows an example of a conventional control sequence during intra-base-station handover. Here, UE 200 and UE 260 are located in cell 102 formed by DU 112, and UE 200 detects cell 104 formed by DU 114 and transmits a message to DU 112. The state is described as the start state. do.

In step (the step may be abbreviated as S) 102, the DU 112 sets information necessary for measurement to the UE 200. In S104, under the control of CU 110 and DU 112, UE 200 transmits user data to UE 260 via the Uu connection for SL data transmission.

In S106, UE200 transmits MR (Measurement Report) to CU110. Here, the explanation is continued on the assumption that the conditions for handover are satisfied. In S108, CU110 determines to hand over UE200. In S110, CU110 transmits HO Command to UE200 via DU112. UE200 stops data transmission/reception at the stage of receiving HO Command.

At S<b>112 , the UE 200 detaches from the cell 102 and starts the synchronization process for the cell 104 . When the HO source cell and the HO destination cell are asynchronous, it is necessary to receive a synchronization signal that is broadcast periodically. In this example, the UE 200 receives the synchronization signal block from the DU 114 in S114. If the cells 102 and 104 are synchronized, S114 is not necessary, but if they are not synchronized, the existence of S114 may extend the time until HO completion.

In S116, UE200 transmits RA (Random Access) Preamble to DU114. In S118, DU114 transmits RA Response to UE200.

When the UE 200 is located at the cell edge of the cell 104, RACH retransmission occurs, and RA Preamble is retransmitted from the UE 200 to the DU 114 in S120, and RA Response is transmitted from the DU 114 to the UE 200. This may extend the time until HO completion.

In S124, UE200 transmits HO Complete to CU110. In S126, under the control of CU 110 and DU 114, UE 200 transmits user data to UE 260 via the Uu connection for SL data transmission.

As described above, with DS alone, the UE 200 cannot transmit and receive data during the HO period. The period during which UE 200 cannot transmit and receive data is long when the HO source cell and HO destination cell are not synchronized, or when RACH retransmission occurs due to UE 200 being located at the cell edge of the HO destination cell. can be a period.

FIG. 3 schematically shows an example of a control sequence during intra-base station handover in system 1 . The allocation status 300 indicates the status of the allocation scheme of radio resources allocated to the UE 200 . Here, points different from FIG. 2 will be mainly described.

CU 110 causes DU 112 to change the allocation scheme for direct communication (for SL) between UE 200 and UE 260 from DS to SPS in response to the decision to hand over UE 200 in S208. The CU 110 may change the allocation scheme from DS to SPS through RRC Reconfiguration. The CU 110 preliminarily sets the time/frequency allocation of SL radio resources semi-fixedly. As a result, as shown in S216, continuous data transmission/reception by SL with the UE 260 is possible even in the state of disconnection of the base station during HO.

When CU 110 changes the allocation scheme for direct communication (for SL) by UE 200 with UE 260 from DS to SPS, the allocation scheme for communication by UE 200 via base station 10 may remain DS. If the allocation scheme for all communications by UE 200 is changed from DS to SPS, UE 200 can only use radio resources allocated by SPS from that point on. On the other hand, by keeping DS as the allocation scheme for communication by UE 200 via base station 10, it is possible to allocate radio resources to UE 200 by DS until UE 200 detaches from cell 102. Therefore, it is possible to increase the communication capacity of the UE 200 during this period.

In response to receiving HO Complete in S222, CU 110 changes the allocation scheme for direct communication (for SL) between UE200 and UE260 from SPS to DS in S224. The CU 110 may change the allocation scheme from SPS to DS by RRC Reconfiguration.

FIG. 4 schematically shows an example of a communication environment in system 1. As shown in FIG. In the example shown in FIG. 4, UE200 and UE260 are located in cell 102 formed by base station apparatus 100 of base station 10 and are directly communicating.

In the conventional configuration, even when the preceding vehicle 20 and the following vehicle 26 move and the UE 200 HOs from the cell 102 to the cell 182 formed by the base station device 180 of the base station 18, inter-terminal communication by SL There is a problem that data transmission/reception of the UE 200 becomes impossible. Moreover, in addition to that, in the conventional HO process, the scheduling method of the UE 200 immediately before the HO is inherited, but the scheduling method before that is not inherited, so after the HO process is completed, the SL of the UE 200 cannot be returned to DS. There is also the issue of

In the system 1 according to the present embodiment, the base station apparatus 100 changes the allocation scheme for direct communication (for SL) from DS to SPS even in inter-base station HO as shown in FIG. It enables direct communication and allows the allocation scheme to return to DS after HO is completed.

FIG. 5 schematically shows an example of a control sequence during inter-base-station handover in system 1 . Here, UE200 and UE260 are located in the cell 102 formed by Source-cell CU110, UE200 detects the cell 182 formed by Target-cell CU190 and sends a message to CU110 The transmitted state is described as the start state. The allocation status 300 indicates the status of the allocation scheme of radio resources allocated to the UE 200 .

In S302, the CU 110 sets information necessary for measurement to the UE 200. In S304, under the control of the CU 110, the UE 200 transmits user data to the UE 260 via the Uu connection for SL data transmission.

In S306, UE200 transmits MR to CU110. Here, the explanation is continued on the assumption that the conditions for handover are satisfied. In S308, CU110 determines to hand over UE200. In S310, the CU 110 changes the allocation scheme for direct communication (for SL) between the UE 200 and the UE 260 from DS to SPS. The CU 110 may change the allocation scheme from DS to SPS through RRC Reconfiguration. The CU 110 preliminarily sets the time/frequency allocation of SL radio resources semi-fixedly.

In S312, CU110 transmits HO Request of UE200 to CU190. After UE 200 is handed over, CU 110 transmits to CU 190 including notification data for notifying that the allocation scheme is to be changed from SPS to DS in HO Request.

In S314, the CU 190 performs admission control. In S316, CU190 transmits HO Request acknowledge to CU110.

In S318, CU110 transmits HO Command to UE200. At S320, the UE 200 detaches from the cell 102 and synchronizes to the cell 182. In S322, UE200 transmits user data to UE260 using semi-fixed radio resources by SPS.

In S324, UE200 transmits RA Preamble to CU190. In S326, CU190 transmits RA Response to UE200. In S328, UE200 transmits HO Complete to CU190.

In S330, the CU 190 changes the SL allocation method from SPS to DS according to the notification data included in the HO Request received in S312. The CU 110 may change the allocation scheme from SPS to DS by RRC Reconfiguration. In S332, under the control of CU190, UE200 transmits user data to UE260 through the Uu connection for SL data transmission.

Thus, CU110 causes CU190 to change the allocation scheme from SPS to DS after UE200 is handed over by including the notification data in the HO Request.

FIG. 6 schematically shows an example of the functional configuration of the base station apparatus 100. As shown in FIG. Base station apparatus 100 includes communication control section 122 , allocation control section 124 , and scheme control section 126 .

Base station apparatus 100 may include both CU and DU. If the CU and DU are separate entities, the base station apparatus 100 may be the CU and may include the allocation control section 124 and the scheme control section 126 . In this case, the communication control unit 122 may be provided in the DU.

The communication control unit 122 controls various communications. The communication control unit 122 communicates with the core network in the mobile communication network. The communication control unit 122 communicates with the UE200.

Allocation control section 124 executes radio resource allocation control for UE 200 . The allocation control unit 124 may perform radio resource allocation control for the UE 200 using a first allocation scheme that dynamically allocates radio resources. The first allocation scheme is DS, for example.

The allocation control unit 124 may perform radio resource allocation control for the UE 200 using a second allocation scheme that allocates radio resources in advance. A second allocation scheme is, for example, SPS. A second allocation scheme may be a Configured Grant.

The method control unit 126 controls the allocation method used by the allocation control unit 124 . The method control unit 126 may cause the allocation control unit 124 to use the first allocation method except when the UE 200 performs HO. The method control unit 126 causes the allocation control unit 124 to keep the first allocation method as the allocation method for communication via the base station 10 when the UE 200 performs HO, and the second allocation method for SL. can be used.

Method control unit 126, while allocation control unit 124 is executing allocation control for UE 200 using the first allocation method, in response to determining that UE 200 is to be HO, allocation control unit 124 The allocation scheme used for the UE 200 is changed from the first allocation scheme to the second allocation scheme. The scheme control unit 126 may change the allocation scheme for the UE 200 using the RRC message. The scheme control unit 126 may change the allocation scheme for the UE 200 by RRC Reconfiguration.

Method control unit 126, in response to determining that UE 200 is to be HO while allocation control unit 124 is executing allocation control for UE 200 using the first allocation method, allocation control unit 124 instructs allocation control unit 124 to perform allocation control for UE 200 may change the allocation scheme for direct communication with another UE 200 from the first allocation scheme to the second allocation scheme. Method control unit 126, when allocation control unit 124 is executing allocation control for UE 200 using the first allocation method, in response to determining to HO UE 200, allocation control unit 124 causes allocation control unit 124 to The allocation method for communication by the UE 200 via the base station remains the first allocation method, and the allocation method for direct communication by the UE 200 with another UE 200 is changed from the first allocation method to the second allocation method. let me

Scheme control section 126 selects the allocation scheme used by allocation control section 124 for UE 200 from the first allocation scheme to It may be changed to the second allocation method. As a result, it is possible to suppress the occurrence of time during which the UE 200 cannot communicate.

When the scheme control unit 126 decides to HO the UE 200 to a cell generated by another base station apparatus, the allocation scheme that the allocation control unit 124 uses for the UE 200 is changed from the first allocation scheme to the second allocation scheme. After the UE 200 performs HO, notification data for notifying that the allocation scheme is changed from the second allocation scheme to the first allocation scheme is transmitted to the other base station apparatus. You can The scheme control unit 126 may include the notification data in the HO request and transmit the HO request to the other base station apparatus. As a result, when UE 200 performs HO between base stations, it is possible to continue data transmission of UE 200 during HO and to execute efficient resource allocation using DS immediately after HO.

FIG. 7 schematically shows an example of a hardware configuration of computer 1200 functioning as base station apparatus 100. As shown in FIG. Programs installed on the computer 1200 cause the computer 1200 to function as one or more "parts" of the apparatus of the present embodiments, or cause the computer 1200 to operate or perform operations associated with the apparatus of the present invention. Multiple "units" can be executed and/or the computer 1200 can be caused to execute the process or steps of the process according to the present invention. Such programs may be executed by CPU 1212 to cause computer 1200 to perform certain operations associated with some or all of the blocks in the flowcharts and block diagrams described herein.

Computer 1200 according to this embodiment includes CPU 1212 , RAM 1214 , and graphics controller 1216 , which are interconnected by host controller 1210 . Computer 1200 also includes input/output units such as communication interface 1222 , storage device 1224 , DVD drive, and IC card drive, which are connected to host controller 1210 via input/output controller 1220 . The DVD drive may be a DVD-ROM drive, a DVD-RAM drive, and the like. Storage devices 1224 may be hard disk drives, solid state drives, and the like. Computer 1200 also includes legacy input/output units, such as ROM 1230 and keyboard, which are connected to input/output controller 1220 via input/output chip 1240 .

The CPU 1212 operates according to programs stored in the ROM 1230 and RAM 1214, thereby controlling each unit. Graphics controller 1216 retrieves image data generated by CPU 1212 into a frame buffer or the like provided in RAM 1214 or itself, and causes the image data to be displayed on display device 1218 .

Communication interface 1222 communicates with other electronic devices over a network. Storage device 1224 stores programs and data used by CPU 1212 within computer 1200 . The DVD drive reads programs or data from a DVD-ROM or the like and provides them to the storage device 1224 . The IC card drive reads programs and data from IC cards and/or writes programs and data to IC cards.

ROM 1230 stores therein programs that are dependent on the hardware of computer 1200, such as a boot program that is executed by computer 1200 upon activation. Input/output chip 1240 may also connect various input/output units to input/output controller 1220 via USB ports, parallel ports, serial ports, keyboard ports, mouse ports, and the like.

The program is provided by a computer-readable storage medium such as DVD-ROM or IC card. The program is read from a computer-readable storage medium, installed in storage device 1224 , RAM 1214 , or ROM 1230 , which are also examples of computer-readable storage media, and executed by CPU 1212 . The information processing described within these programs is read by computer 1200 to provide coordination between the programs and the various types of hardware resources described above. An apparatus or method may be configured by implementing information operations or processing according to the use of computer 1200 .

For example, when communication is performed between the computer 1200 and an external device, the CPU 1212 executes a communication program loaded into the RAM 1214 and sends communication processing to the communication interface 1222 based on the processing described in the communication program. you can command. The communication interface 1222 reads transmission data stored in a transmission buffer area provided in a recording medium such as a RAM 1214, a storage device 1224, a DVD-ROM, or an IC card under the control of the CPU 1212, and transmits the read transmission data. Data is transmitted to the network, or received data received from the network is written in a receive buffer area or the like provided on the recording medium.

In addition, the CPU 1212 causes the RAM 1214 to read all or necessary portions of files or databases stored in an external recording medium such as a storage device 1224, a DVD drive (DVD-ROM), an IC card, etc. Various types of processing may be performed on the data. CPU 1212 may then write back the processed data to an external recording medium.

Various types of information, such as various types of programs, data, tables, and databases, may be stored on recording media and subjected to information processing. CPU 1212 performs various types of operations on data read from RAM 1214, information processing, conditional decisions, conditional branching, unconditional branching, and information retrieval, which are described throughout this disclosure and are specified by instruction sequences of programs. Various types of processing may be performed, including /replace, etc., and the results written back to RAM 1214 . In addition, the CPU 1212 may search for information in a file in a recording medium, a database, or the like. For example, when a plurality of entries each having an attribute value of a first attribute associated with an attribute value of a second attribute are stored in the recording medium, the CPU 1212 selects the first attribute from among the plurality of entries. search for an entry that matches the specified condition of the attribute value of the attribute, read the attribute value of the second attribute stored in the entry, and thereby determine the first attribute that satisfies the predetermined condition An attribute value of the associated second attribute may be obtained.

The programs or software modules described above may be stored in a computer-readable storage medium on or near computer 1200 . Also, a recording medium such as a hard disk or RAM provided in a server system connected to a dedicated communication network or the Internet can be used as a computer-readable storage medium, whereby the program can be transferred to the computer 1200 via the network. offer.

The blocks in the flowcharts and block diagrams in this embodiment may represent steps in the process in which the operations are performed or "parts" of the apparatus responsible for performing the operations. Certain steps and "sections" may be provided with dedicated circuitry, programmable circuitry provided with computer readable instructions stored on a computer readable storage medium, and/or computer readable instructions provided with computer readable instructions stored on a computer readable storage medium. It may be implemented by a processor. Dedicated circuitry may include digital and/or analog hardware circuitry, and may include integrated circuits (ICs) and/or discrete circuitry. Programmable circuits, such as Field Programmable Gate Arrays (FPGAs), Programmable Logic Arrays (PLAs), etc., perform AND, OR, EXCLUSIVE OR, NOT AND, NOT OR, and other logical operations. , flip-flops, registers, and memory elements.

A computer-readable storage medium may comprise any tangible device capable of storing instructions to be executed by a suitable device, such that a computer-readable storage medium having instructions stored thereon may be illustrated in flowchart or block diagram form. It will comprise an article of manufacture containing instructions that can be executed to create means for performing specified operations. Examples of computer-readable storage media may include electronic storage media, magnetic storage media, optical storage media, electromagnetic storage media, semiconductor storage media, and the like. More specific examples of computer readable storage media include floppy disks, diskettes, hard disks, random access memory (RAM), read only memory (ROM), erasable programmable read only memory (EPROM or flash memory) , electrically erasable programmable read only memory (EEPROM), static random access memory (SRAM), compact disc read only memory (CD-ROM), digital versatile disc (DVD), Blu-ray disc, memory stick , integrated circuit cards, and the like.

The computer readable instructions may be assembler instructions, Instruction Set Architecture (ISA) instructions, machine instructions, machine dependent instructions, microcode, firmware instructions, state configuration data, or instructions such as Smalltalk, JAVA, C++, etc. any source or object code written in any combination of one or more programming languages, including object-oriented programming languages, and conventional procedural programming languages such as the "C" programming language or similar programming languages; may include

Computer readable instructions are used to produce means for a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, or programmable circuits to perform the operations specified in the flowchart or block diagrams. A general purpose computer, special purpose computer, or other programmable data processor, locally or over a wide area network (WAN) such as the Internet, etc., to execute such computer readable instructions. It may be provided in the processor of the device or in a programmable circuit. Examples of processors include computer processors, processing units, microprocessors, digital signal processors, controllers, microcontrollers, and the like.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is obvious to those skilled in the art that various modifications or improvements can be made to the above embodiments. It is clear from the description of the scope of the claims that forms with such modifications or improvements can also be included in the technical scope of the present invention.

The execution order of each process such as actions, procedures, steps, and stages in the devices, systems, programs, and methods shown in the claims, the specification, and the drawings is etc., and it should be noted that they can be implemented in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the specification, and the drawings, even if the description is made using "first," "next," etc. for convenience, it means that it is essential to carry out in this order. not a thing

10 base station, 18 base station, 20 preceding vehicle, 26 following vehicle, 100 base station device, 102 cell, 110 CU, 112 DU, 114 DU, 122 communication control unit, 124 allocation control unit, 126 scheme control unit, 180 base station equipment, 182 cell, 190 CU, 200 UE, 260 UE, 300 allocation status, 1200 computer, 1210 host controller, 1212 CPU, 1214 RAM, 1216 graphic controller, 1218 display device, 1220 input/output controller, 1222 communication interface, 1224 Storage device, 1230 ROM, 1240 input/output chip

Claims (9)

an allocation control unit that executes allocation control of radio resources for user terminals;
After determining that the user terminal is to be handed over when the allocation control unit is executing allocation control for the user terminal using a first allocation scheme for dynamically allocating radio resources, the user terminal before transmitting a handover command to the user terminal, the allocation control unit changes the allocation method used for the user terminal from the first allocation method to a second allocation method that allocates radio resources in advance. A base station apparatus comprising: a control unit; an allocation control unit that executes allocation control of radio resources for user terminals;
When the allocation control unit is executing allocation control for the user terminal using a first allocation scheme for dynamically allocating radio resources, the user terminal is handed over to a cell generated by another base station apparatus. In response to the decision to allow the allocation control unit to change the allocation scheme used for the user terminal from the first allocation scheme to a second allocation scheme that pre-allocates radio resources, and a method control unit that transmits notification data to notify that the allocation method is to be changed from the second allocation method to the first allocation method after the user terminal has handed over, to the base station apparatus of A base station device provided. an allocation control unit that executes allocation control of radio resources for user terminals;
In response to the allocation control unit determining that the user terminal is to be handed over while executing allocation control for the user terminal using a first allocation scheme for dynamically allocating radio resources, the allocation setting the allocation method for communication by the user terminal via the base station to the first allocation method, and setting the allocation method for direct communication by the user terminal to another user terminal to the first allocation method. A base station apparatus comprising: a method control unit for changing from an allocation method to a second allocation method in which radio resources are allocated in advance. an allocation control unit that executes allocation control of radio resources for user terminals;
In response to determining that the user terminal is to be handed over when the allocation control unit is executing allocation control for the user terminal using a first allocation scheme for dynamically allocating radio resources, a method control unit that changes the allocation method used by the allocation control unit for the user terminal from the first allocation method to a second allocation method that allocates radio resources in advance,
The first allocation scheme is Dynamic Scheduling,
The second allocation scheme is Configured Grant,
Base station equipment. A program for causing a computer to function as the base station apparatus according to any one of claims 1 to 4 . A control method executed by a base station device, comprising:
executing radio resource allocation control for the user terminal using a first allocation scheme for dynamically allocating radio resources to the user terminal;
determining to handover the user terminal when performing allocation control using the first allocation scheme for the user terminal;
After determining to handover the user terminal until transmitting a handover command to the user terminal, the allocation method used for the user terminal is set to the first allocation method, and radio resources are allocated in advance. A control method comprising: changing to a second allocation scheme for allocation, and executing allocation control of radio resources for the user terminal. A control method executed by a base station device, comprising:
executing radio resource allocation control for the user terminal using a first allocation scheme for dynamically allocating radio resources to the user terminal;
determining to hand over the user terminal to a cell generated by another base station apparatus when performing allocation control using the first allocation scheme for the user terminal;
The allocation scheme used for the user terminal is changed from the first allocation scheme to a second allocation scheme for pre-assigning radio resources, and the user terminal is handed over to the other base station apparatus. and transmitting notification data for notifying that the allocation scheme will be changed from the second allocation scheme to the first allocation scheme later, and executing radio resource allocation control for the user terminal. . A control method executed by a base station device, comprising:
executing radio resource allocation control for the user terminal using a first allocation scheme for dynamically allocating radio resources to the user terminal;
determining to handover the user terminal when performing allocation control using the first allocation scheme for the user terminal;
The allocation method for communication by the user terminal via the base station remains the first allocation method, and the allocation method for direct communication by the user terminal with another user terminal is changed from the first allocation method to A control method comprising: changing to a second allocation scheme in which radio resources are allocated in advance, and performing radio resource allocation control for the user terminal. A control method executed by a base station device, comprising:
executing radio resource allocation control for the user terminal using a first allocation scheme for dynamically allocating radio resources to the user terminal;
determining to handover the user terminal when performing allocation control using the first allocation scheme for the user terminal;
changing the allocation scheme used for the user terminal from the first allocation scheme to a second allocation scheme for pre-assigning radio resources, and executing radio resource allocation control for the user terminal;
The first allocation scheme is Dynamic Scheduling,
The second allocation scheme is Configured Grant,
control method.

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