JP7576119B2 - Reservation communication control device, reservation communication control method and program - Google Patents

Description

The present invention relates to a reservation communication control device, a reservation communication control method, and a program that can appropriately handle BDT reservations so as to avoid degradation of KPIs due to the execution of BDT and violation of BDT SLAs.

In 5G networks, key performance indicators (KPIs) are used to calculate performance indicators such as throughput, call drop rate, and mute call rate.

Information about KPIs is calculated from events within the carrier's network. For example, the carrier implements network performance improvement plans based on its own KPIs. Base stations record traffic KPIs and send them to a data server.

In addition, in order to optimize network resources, the 5G network provides background data transmission (BDT), which transmits large amounts of data with relatively few time constraints (e.g., data for software updates) at a low priority. Such transmissions are scheduled, for example, during times when the network load is low. The network exposure function (NEF)/policy control function (PCF), which are network function parts of the 5G core network, have the function of reserving communications.

For example, Patent Document 1 discloses a method of updating the BDT policy through negotiation between the application function (AF) and the core network (CN). In this technology, the PCF determines the impact of deteriorating network performance and determines the BDT policy information.

Special Publication No. 2022-537714

However, if BDT reservations are not handled appropriately, it can lead to a deterioration in KPIs. Also, new BDT reservations may result in existing BDT reservations not meeting their SLAs (Service Level Agreements).

In particular, factors such as the throughput of the base station cell to which the terminal device is connected during the time period when BDT is executed can have a significant impact on KPIs and reservation SLAs. Furthermore, unintended results can occur if the base station cell to which the terminal device is predicted to be connected when reserving BDT differs from the base station cell to which the terminal device is connected when BDT is actually executed.

One aspect of the present invention aims to realize a technology that can appropriately handle BDT reservations so as to avoid the deterioration of KPIs due to the execution of BDT, violation of SLAs related to BDT, etc.

A reservation communication control device according to one aspect of the present invention is a reservation communication control device that controls the reservation of background data transmission (BDT) and the execution of the reservation, and includes a receiving unit that receives a reservation request for BDT related to a terminal device connected to a core network, the reservation request specifying a data capacity and an execution time slot; a first judgment unit that predicts a first throughput, which is the throughput of a cell identified by first cell information and to which the terminal device is connected during the execution time slot of the BDT of the reservation request, and judges whether the BDT of the reservation request can be completed by the cell during the execution time slot; a second judgment unit that predicts a second throughput obtained by subtracting the amount of throughput reduction caused by executing the BDT of the reservation request in the cell from the first throughput, and judges whether the second throughput of the cell is equal to or greater than a threshold; and a reservation acceptance/rejection determination unit that determines whether to accept or reject the reservation request based on the judgment result of the first judgment unit and the judgment result of the second judgment unit.

A reservation communication control method according to one aspect of the present invention is a reservation communication control method for controlling the reservation of background data transmission (BDT) and the execution of the reservation, and includes the steps of receiving a reservation request for BDT related to a terminal device connected to a core network, the reservation request specifying a data capacity and an execution time slot, predicting a first throughput, which is the throughput of a cell identified by first cell information and to which the terminal device is connected during the execution time slot of the BDT of the reservation request, determining whether the BDT of the reservation request can be completed by the cell during the execution time slot, predicting a second throughput obtained by subtracting the amount of throughput reduction caused by executing the BDT of the reservation request in the cell from the first throughput, determining whether the second throughput of the cell is equal to or greater than a threshold, and deciding whether to accept or reject the reservation request based on the judgment result of the first judgment unit and the judgment result of the second judgment unit.

Each aspect of the present invention may be realized by a computer. In this case, the program that causes a computer to execute each step of the above method, and the computer-readable recording medium on which the program is recorded, also fall within the scope of the present invention.

According to one aspect of the present invention, BDT reservations can be appropriately handled to avoid degradation of KPIs due to BDT execution and violation of BDT SLAs.

FIG. 1 is a diagram illustrating an example of the configuration of a 5G communication system. 2 is a block diagram showing an example of a functional configuration of a reservation communication control device according to the first embodiment; FIG. 13 is a diagram illustrating an example of a position cell table. FIG. 11 is a diagram illustrating an example of a method for calculating a predicted throughput. FIG. 10 is a diagram illustrating an example of a transmission schedule. FIG. 13 is a diagram illustrating a prediction of a cell's throughput taking into account the degradation amount corresponding to the number of BDTs performed. 13 is a flowchart illustrating an example of a reservation request acceptance process. 11 is a flowchart illustrating an example of a transmission schedule generating process. 13 is a flowchart illustrating an example of an influence calculation process. 13 is a flowchart illustrating an example of a reservation acceptance/rejection determination process. 13 is a flowchart illustrating another example of the reservation acceptance/rejection determination process. 13 is a flowchart illustrating an example of a reservation execution control process. FIG. 11 is a block diagram showing an example of a functional configuration of a reservation communication control device according to a second embodiment. FIG. 1 is a diagram illustrating an example of the configuration of a computer that executes instructions of a program, which is software that realizes each function.

Below, an embodiment of the present invention will be described with reference to the drawings.

(Configuration of 5G communication system)
FIG. 1 is a diagram illustrating an example of the configuration of a 5G communication system 10 according to this embodiment.

As shown in FIG. 1, the core network 50 of the 5G communication system 10 is connected to multiple base stations. In reality, tens of thousands of base stations are connected to the core network 50, but the example in FIG. 1 shows base station 41-1 and base station 41-2. Note that base station 41-1 and base station 41-2 will be collectively referred to as base station 41 as appropriate.

The base station 41 is a cell indicated by an oval in the figure, and communicates with UE (User Equipment) 21, which is a terminal device located within the cell, which is a specified wireless communication area. In reality, one base station 41 can communicate with several hundred UEs 21 at the same time. The UE 21 may be, for example, a smartphone owned by a user, or an electronic device installed in a vehicle.

In the example of FIG. 1, cell 42-1 corresponding to base station 41-1 and cell 42-2 corresponding to base station 41-2 are shown. In this example, the wireless communication area of cell 42-1 partially overlaps with the wireless communication area of cell 42-2, and UE 21 is located in this overlapping area. Therefore, UE 21 can be connected to base station 41-1 of cell 42-1, and can also be connected to base station 41-2 of cell 42-2. Note that cells 42-1 and 42-2 will be collectively referred to as cell 42 for convenience.

The core network 50 has multiple network functions (NFs). In the example of FIG. 1, the NFs of the core network 50 are a user plane function (UPF), a network publishing function (NEF), and a policy control function (PCF). The core network 50 also has other NFs such as an access and mobility management function (AMF) and a session management function (SMF), but their description is omitted here.

The UPF mainly performs control related to the transmission of user data. For example, communication between the UE 21 and the application server 60, or communication of user data between the UE 21 and the reservation communication control device 80 is performed via the UPF. The PCF and NEF are NFs mainly related to the transmission of control signals. The PCF and NEF have a function to make reservations for the execution of communication by, for example, the application server 60 or the UE 21.

Each NF may be configured by a corresponding server, or may be configured by multiple servers, such as a cloud. Furthermore, each NF may be configured by being implemented as software, such as a virtual machine (VM) or a container.

Also shown in FIG. 1 is an application server 60 that communicates with UE 21 via core network 50. Application server 60 is, for example, a server that has a function of distributing data to UE 21, and as one example, distributes data for updating software of UE 21.

In the 5G communication system 10, background data transmission (BDT) is provided to transmit large amounts of data with relatively few time constraints (e.g., data for software updates) at a low priority in order to optimize network resources. For example, data transmission from the application server 60 to the UE 21 is executed as BDT. BDT is reserved by, for example, the application server 60, the UE 21, etc., specifying the execution time period and data capacity.

The above-mentioned network resources include, for example, radio resources between the UE 21 and the base station 41, resources of the communication path between the base station 41 and the UPF, which is a network function part of the 5G network, and resources of the communication path between the UPF and the application server 60.

Also shown in FIG. 1 is a reservation communication control device 80. The reservation communication control device 80 is, for example, a device that controls the reservation of BDT executed between the application server 60 and the UE 21. The reservation communication control device 80 is, for example, configured by one or more servers that can communicate with the core network 50. Alternatively, the reservation communication control device 80 may be configured by being implemented as software such as a virtual machine or a container.

First Embodiment
(Example of the configuration of a reservation communication control device)
2 is a block diagram showing an example of the functional configuration of the reservation communication control device 80. In this example, a reservation request receiving unit 101, a cell referencing unit 102, a transmission schedule generating unit 103, an influence calculating unit 104, and a reservation permission determining unit 105 are shown as functional blocks of the reservation communication control device 80. The reservation communication control device 80 further includes a reservation execution start state checking unit 106, an execution control unit 107, a position cell table 121, a cell/time period throughput table 122, and a reservation table 123.

(Reservation request receiving unit)
The reservation request receiving unit 101 receives a reservation request for BDT related to a terminal device connected to a core network, the reservation request specifying a data capacity and an execution time zone. The reservation request receiving unit 101 receives a reservation request for BDT from, for example, an application server 60. The reservation request for BDT includes, for example, identification information (such as an address) of the application server 60 which is the transmission source, identification information of the UE 21 which is the transmission destination, the capacity of data to be transmitted, and information specifying the time zone for transmission.

The reservation request receiving unit 101 also receives location information of the UE 21 from the UE 21. Note that the location information may be information indicating the location of the UE 21 specified by, for example, latitude and longitude.

The location information does not necessarily have to be the current location of UE21. The location information may be, for example, the location where UE21 is located during the execution time period of the BDT. For example, if UE21 is an electronic device attached to a vehicle, the location information may be information that identifies the location of a parking lot where the vehicle is parked.

(Cell Inquiry Department)
The cell reference unit 102 acquires the location information via the reservation request receiving unit 101, and refers to the location cell table 121 to identify the cell 42 of the base station 41 to which the UE 21 at the location identified by the location information is connected.

The location cell table 121 is a table that describes information that associates location information with a cell that can be connected to at the location of the location information. Figure 3 shows an example of the location cell table 121.

In the example of FIG. 3, "geomesh" is shown as the location information, and the latitude "lat" and longitude "lon" specified by the character string written as "geomesh" are shown. For example, if "geomesh" is "xn76fgre", the latitude (lat) is 35.6581 and the longitude (lon) is 139.7016. The location information of UE21 acquired via the reservation request receiving unit 101 may be, for example, "geomesh".

In the example of FIG. 3, "cellList" is shown as information on the cell corresponding to the location information. "cellList" shows a list of cells 42 of base stations 41 to which UE 21 at the location can be connected, i.e., a list of candidate cells. For example, "cell1" in "cellList" describes the identification information of the first candidate cell, and "rsrp1" describes the electric field strength of the "cell1" cell. Similarly, "cell2", "cell3", ... describes the identification information of the second, third, ... candidate cells, and "rsrp2", "rsrp3", ... describes the electric field strength of the "cell2", "cell3", ... cells.

The cell query unit 102 identifies the cell described in "cellList" by searching the location cell table 121 using the location information of the UE 21 described as "geomesh".

For example, if the location information of UE21 is "xn76fgre", a cell with identification information "Cell-000" is described in "cellList". In this case, UE21 is connected to a cell with identification information "Cell-000". The cell inquiry unit 102 supplies one cell described in "cellList" to the transmission schedule generation unit 103 as first cell information indicating the cell to which UE21 is connected during the execution time period of BDT.

For example, when the location information of UE21 is "xn76fgrf", a cell with identification information "Cell-000" and a cell with identification information "Cell-004" are described in "cellList". In this case, UE21 is connected to either the cell with identification information "Cell-000" or the cell with identification information "Cell-004". Cell inquiry unit 102 supplies information identifying the two cells described in "cellList" to transmission schedule generation unit 103 as first cell information indicating the cell to which UE21 is connected during the execution time period of BDT.

In this way, the cell inquiry unit 102 outputs the first cell information by referring to the location cell table 121. At this time, the cell inquiry unit 102 identifies one or more cells that can be connected at the location corresponding to the location information as cells to which the UE 21 will be connected during the execution time period, and outputs the first cell information.

(Transmission schedule generation unit)
The transmission schedule generating unit 103 generates a transmission schedule indicating the time required to complete transmission of the data volume based on the information indicating the data volume included in the reservation request and the information indicating the time period during which the transmission will be performed. The transmission schedule generating unit 103 generates the transmission schedule by referring to the cell/time period specific throughput table 122.

The cell/time slot throughput table 122 stores information indicating the predicted throughput for each cell in each time slot. For example, for a cell with identification information "Cell-000", information is stored indicating the predicted throughput for the time slot from 20:00 to 21:00, the predicted throughput for the time slot from 21:00 to 22:00, etc. Similarly, the predicted throughput for each time slot is stored for a cell with identification information "Cell-001", a cell with identification information "Cell-002", etc. Note that even for the same time slot, the predicted throughput may be displayed by day of the week or date, for example.

The method of calculating the predicted throughput is arbitrary. For example, the predicted throughput may be calculated by collecting information indicating the throughput for each cell recorded by a network function unit or the like in the core network 50 for a certain period of time in the past and finding the average value for each time period. The predicted throughput calculated in this manner will be referred to as the first throughput, as appropriate. In other words, the first throughput is predicted based on the throughput in the execution time period of the cell, which is predicted based on information related to past communications recorded by the core network 50.

Figure 4 is a diagram illustrating an example of the first throughput calculation method. In this diagram, the vertical axis represents throughput, the horizontal axis represents time, and a curve shows the change in throughput of one cell over time.

Curve 201a in FIG. 4 shows the throughput calculated by collecting information indicating the throughput of the cell recorded by the network function unit for the past month and calculating the average value by time period. Curve 201b in FIG. 4 shows the throughput predicted on the assumption that the throughput of the cell will change in the future in the same way as curve 201a. Note that, although an example of calculating the average value has been described here as an example of a method for calculating the first throughput, the calculation method is not limited to this. For example, the first throughput may be calculated by applying machine learning, statistical processing, or the like to information indicating the past throughput of the cell.

The transmission schedule generating unit 103 determines the time to start transmission (hereinafter referred to as the transmission start time) based on information included in the reservation request indicating the time period during which transmission will be performed (hereinafter referred to as the execution time period). The transmission schedule generating unit 103 also refers to the cell/time period throughput table 122 to obtain the predicted throughput for the time period after the cell transmission start time specified by the first cell information supplied from the cell querying unit 102. The transmission schedule generating unit 103 then determines the time at which transmission will be completed (hereinafter referred to as the transmission completion time) when transmission of the amount of data included in the reservation request is started at the transmission start time.

Figure 5 is a diagram illustrating an example of a transmission schedule. As an example, the figure shows the transmission schedule of a cell with identification information "Cell-000", with the horizontal axis representing time and vertical lines separating time periods. In this example, the time periods shown are 20:00-21:00, 21:00-22:00, ..., 07:00-08:00.

In the example shown in FIG. 5, for ease of explanation, hourly time periods are shown, but in practice the time periods may be divided into shorter time periods (e.g., 10-minute intervals).

The transmission schedules are shown in horizontally long rectangular frames in Figure 5. In this example, transmission schedules TS1 to TS4 are shown.

The borders of each transmission schedule are drawn to correspond to the execution time period included in the reservation request. For example, the execution time period of the BDT related to transmission schedule TS1 is from 20:00 to 02:00, and the execution time period of the BDT related to transmission schedule TS4 is from 23:00 to 06:00.

In each transmission schedule, a certain portion of the frame is hatched to correspond to the transmission start time and the transmission completion time. For example, the BDT related to transmission schedule TS1 has a data capacity of 63 GB, so if the transmission start time is 20:00, the transmission completion time will be 01:00. Therefore, the BDT related to transmission schedule TS1 can complete transmission within the execution time period specified in the reservation request.

In addition, since the BDT related to transmission schedule TS2 has a data capacity of 50 GB, if the transmission start time is 22:00, the transmission completion time will be approximately 01:00. Therefore, it is also possible for the BDT related to transmission schedule TS2 to complete transmission within the execution time period specified in the reservation request.

The transmission schedule generation unit 103 generates a transmission schedule based not only on the received reservation request but also on the reservation information of the BDT stored in the reservation table 123 described later. For example, the transmission schedules TS1 to TS3 in FIG. 5 are generated based on the reservation information of the BDT stored in the reservation table 123, and the transmission schedule TS4 is generated based on the most recently received reservation request. The determination result of the transmission schedule generation unit 103 and the transmission schedule generated for each cell are supplied to the impact calculation unit 104.

The transmission schedule generation unit 103 determines whether the BDT corresponding to the most recently received reservation request can complete transmission within the execution time period specified in the reservation request.

If it is determined that the BDT can complete the transmission during the execution time period specified in the reservation request, the transmission schedule generation unit 103 sets a first flag indicating whether or not the transmission during the execution time period can be completed to ON, and generates a transmission schedule such as that shown in FIG. 5.

On the other hand, if it is determined that the BDT cannot complete the transmission within the execution time period specified in the reservation request, the transmission schedule generation unit 103 sets the first flag to OFF. In this case, a transmission schedule such as that shown in FIG. 5 is not generated.

Note that if the electric field strength of the cell to which UE21 is connected is low, the throughput of transmission by that cell may be low. For this reason, for example, if the electric field strength of the cell described in "cellList" in FIG. 3 is lower than a predetermined threshold, the throughput used by the transmission schedule generating unit 103 when determining whether or not transmission can be completed within the execution time slot may be corrected.

For example, the first throughput obtained by referring to the cell/time slot throughput table 122 may be multiplied by a numerical value less than 1 according to the electric field strength to correct the value. Then, the time required to transmit the amount of data in the reservation request with the corrected throughput may be calculated, and it may be determined whether the transmission can be completed within the execution time slot.

In this way, the transmission schedule generation unit 103 predicts the first throughput, which is the throughput of the execution time zone of the cell identified by the first cell information and to which the terminal device is connected during the execution time zone of the BDT of the reservation request, and determines whether the BDT of the reservation request can be completed by the cell during the execution time zone.

Then, the transmission schedule generation unit 103 performs this processing for each cell identified by the first cell information.

(Impact Calculation Section)
The influence calculation unit 104 calculates the amount of throughput reduction caused by executing the BDT of the reservation request in the cell by referring to the transmission schedule supplied from the transmission schedule generation unit 103. The amount of throughput reduction is determined, for example, in accordance with the number of BDTs executed in the time period.

Then, the impact calculation unit 104 predicts the second throughput by subtracting from the first throughput the amount of decrease calculated in accordance with the number of BDTs executed during that time period.

Figure 6 is a diagram explaining the prediction of the throughput of a cell taking into account the amount of degradation corresponding to the number of BDTs executed during a given time period. In this figure, the horizontal axis represents time and the vertical axis represents throughput, and the change in throughput over time in one cell is shown by a curve.

Curve 201 shows the first throughput of the cell. Curve 202 shows the predicted throughput obtained by subtracting the amount of reduction corresponding to the number of BDTs executed in each time period from the first throughput value in that time period. The amount of reduction in throughput is expressed as a function with the number of BDTs executed as a parameter, and is actually calculated by a complex calculation. For simplicity's sake, it will be explained here that, for example, the execution of one BDT reduces the throughput of the cell by 1 Mbps.

For example, at the time (23:45) indicated by the vertical dotted line in Figure 5, four BDTs are being executed, and the throughput drops by approximately 4 Mbps. Furthermore, the throughput for this time period (23:00-24:00) obtained by referring to the cell-time-specific throughput table 122 is 30 Mbps. Therefore, the impact calculation unit 104 calculates the amount of throughput drop in the time period from 23:00 to 24:00 as 4 Mbps, and calculates the predicted throughput (second throughput) for the cell in the time period from 23:00 to 24:00 as 26 Mbps (= 30 Mbps - 4 Mbps).

The impact calculation unit 104 calculates the second throughput at each time (e.g., every minute) between the transmission start time and the transmission completion time of the transmission schedule created based on the reservation request, and compares the calculated second throughput with a preset threshold value. Here, the threshold value is, for example, a lower limit throughput that is the lower limit of the throughput that should be achieved by the cell, and is set based on, for example, a KPI.

For example, if the lower limit throughput of cell "Cell-000" is 8 Mbps, the second throughput (26 Mbps) is equal to or greater than the lower limit throughput (8 Mbps). The impact calculation unit 104 calculates the second throughput in this manner and determines whether it is equal to or greater than the threshold.

If the second throughput is equal to or greater than the threshold, the impact calculation unit 104 sets a second flag indicating whether the lower limit requirement of the second throughput is met to ON. On the other hand, if the second throughput is less than the threshold, the impact calculation unit 104 sets the second flag to OFF.

In this way, the impact calculation unit 104 predicts the second throughput obtained by subtracting the amount of throughput reduction caused by executing BDT of the reservation request in the cell from the first throughput, and determines whether the second throughput of the cell is equal to or greater than the threshold value.

Then, the influence calculation unit 104 performs such a determination for each cell identified by the first cell information supplied from the cell reference unit 102.

The result of the determination by the influence calculation unit 104 (ON/OFF of the second flag) is supplied to the reservation permission determination unit 105 together with the result of the determination by the transmission schedule generation unit 103 (ON/OFF of the first flag).

For a cell for which no transmission schedule has been generated, the impact calculation unit 104 does not calculate the second throughput and compare it with the threshold value. This is because, in a cell for which no transmission schedule has been generated, the BDT corresponding to the most recently received reservation request cannot be completed in the execution time period specified in the reservation request, and therefore the BDT cannot be executed in this cell.

(Reservation Acceptance Determination Unit)
The reservation acceptance/rejection determining unit 105 determines whether to accept or reject the reservation request received by the reservation request receiving unit 101 based on the results of the determination by the influence calculating unit 104 and the results of the determination by the transmission schedule generating unit 103 .

For example, if the BDT of the transmission schedule can complete transmission in the execution time period specified in the reservation request in all of the cells identified by the information supplied from the cell reference unit 102, and the second throughput is equal to or greater than the threshold in all of those cells, the reservation acceptance determination unit 105 accepts the reservation request.

In this way, the reservation acceptance/rejection determination unit 105 decides to accept the reservation request when the transmission schedule generation unit 103 determines that the BDT of the reservation request can be completed within the execution time period for all cells included in the first cell information, and the impact calculation unit 104 determines that the second throughput is equal to or greater than the threshold value for all cells.

When accepting a reservation request, the reservation acceptance determination unit 105 writes the information included in the accepted reservation request to the reservation table 123. The reservation table 123 is a table that records information on accepted reservation requests for each cell. In this case, the reservation acceptance determination unit 105 writes reservation information including the identification information of the cell specified by the first cell information supplied from the cell inquiry unit 102 and the information included in the accepted reservation request to the reservation table 123.

On the other hand, if the BDT of the transmission schedule cannot complete transmission in the execution time period specified in the reservation request in any of the cells identified by the information supplied from the cell reference unit 102, or if the second throughput in any of those cells is less than the threshold value, the reservation acceptance determination unit 105 rejects the reservation request.

The reservation acceptance/rejection determination unit 105 notifies the UE 21 and the application server 60 of the decision to accept or reject the reservation request. If the reservation request is accepted, the SLA (Service Level Agreement) is that the amount of data specified in the summary request is transmitted during the execution time period, provided that the location of UE 21 during the execution time period corresponds to the location information received together with the reservation request.

In the above example, it has been explained that the reservation request is accepted if transmission can be completed in the specified execution time slot in all of the candidate cells and the second throughput is equal to or greater than the threshold in all of those cells. However, for example, the reservation request may be accepted if transmission can be completed in the specified execution time slot in any of the candidate cells and the second throughput is equal to or greater than the threshold.

In other words, the reservation request may be accepted only for candidate cells that satisfy the requirements. If the cell can complete the transmission within the specified execution time slot and has a second throughput equal to or greater than the threshold, the cell satisfies the requirements.

In this way, when the transmission schedule generation unit 103 determines that the BDT of the reservation request can be completed within the execution time period by one or more cells among the cells included in the first cell information, and the impact calculation unit 104 determines that the second throughput is equal to or greater than the threshold value in the one or more cells, the reservation acceptance determination unit 105 may specify the one or more cells and decide to accept the reservation request.

In this case, reservation information including the identification information of the cell that satisfies the requirements and the information included in the accepted reservation request is written to the reservation table 123. Then, when notifying the UE 21 and the application server 60 of the decision to accept the reservation request, the reservation acceptance determination unit 105 also notifies information related to the specified cell (i.e., the cell that satisfies the requirements). For example, when notifying the decision to accept the reservation request, the RFSP index (RAT/Frequency Selection Priority index)/SPID (Subscriber Profile ID for RAT/Frequency Priority) corresponding to the cell that satisfies the requirements may be notified.

(Reservation execution start status confirmation unit)
The reservation execution start state confirmation unit 106 confirms the state of the UE 21 at the time of starting execution of the BDT corresponding to the reservation request whose acceptance has been decided by the reservation acceptance decision unit 105. More specifically, the reservation execution start state confirmation unit 106 acquires, from the core network 50, second cell information that identifies the cell to which the UE 21 is connected at the time of starting execution of the BDT.

The reservation execution start state confirmation unit 106 obtains the transmission start time of each BDT by referring to the reservation table 123. When the transmission start time of the reserved BDT approaches (for example, one minute before the transmission start time), the reservation execution start state confirmation unit 106 identifies the cell to which the UE 21 specified in the reservation request for the BDT is connected.

The cell to which UE21 is connected can be identified, for example, by obtaining location information from the network function unit of the core network 50. In the example of FIG. 13, location information is obtained from the NEF of the core network 50.

The reservation execution start state confirmation unit 106 supplies the second cell information, which includes the identification information of the identified cell, to the execution control unit 107.

(Executive Control Unit)
The execution control unit 107 refers to the information supplied from the reservation execution start state confirmation unit 106 and controls the execution of the reserved BDT.

The execution control unit 107 refers to the reservation table 123 to obtain the transmission start time of each BDT. The execution control unit 107 identifies the cell to which the UE 21 is connected based on the information supplied from the reservation execution start status confirmation unit 106 when starting the transmission of each BDT.

Then, the executive control unit 107 determines whether or not the cell to which UE21 is connected for each BDT is different from the cell described in the reservation information.

If it is determined that the cell to which UE21 is connected is different from the cell described in the reservation information, the execution control unit 107 stops the execution of the BDT. In other words, if the transmission of the BDT that the reservation acceptance decision unit has decided to accept is to be executed in a cell other than the cell related to the decision to accept, the execution of the BDT is stopped. If it is executed in a different cell, the transmission may not be completed during the execution time period of the reservation request, and even if the transmission is completed during the execution time period, the lower limit requirement of the cell throughput may not be met.

In this way, the execution control unit 107 stops the execution of the BDT of the reservation request when the cell identified by the second cell information is determined by the transmission schedule generation unit 103 to be able to complete the BDT of the reservation request within the execution time slot, and is not included in the cells determined by the impact calculation unit 104 to have a second throughput equal to or greater than the threshold value.

On the other hand, if it is determined that the cell to which UE21 is connected corresponds to one of the cells described in the reservation information, the execution control unit 107 executes the transmission of the BDT.

(Reservation request acceptance process flow)
Next, a flow of a reservation request acceptance process by the reservation communication control device will be described with reference to FIG 7. An example of the reservation request acceptance process will be described with reference to the flowchart of FIG.

In step S20, the reservation request receiving unit 101 determines whether or not the customer has given consent to the BDT reservation. For example, it determines whether or not the customer has given prior consent to the conditions and restrictions for the BDT reservation.

Note that step S20 may not be executed.

If it is determined in step S20 that the customer has given consent to the BDT reservation, the process of step S21 is executed, and if it is determined that the customer has not given consent, the reservation request acceptance process ends.

In step S21, the reservation request receiving unit 101 receives the reservation request and location information.

At this time, a BDT reservation request is received from, for example, application server 60. The BDT reservation request includes, for example, identification information (such as an address) of application server 60, which is the transmission source, identification information of UE 21, which is the transmission destination, the amount of data to be transmitted, and information specifying the execution time period during which the transmission will be performed.

The reservation request receiving unit 101 also receives location information of the UE 21 from the UE 21. Note that the location information may be information indicating the location of the UE 21 specified by, for example, latitude and longitude.

In step S22, the cell inquiry unit 102 acquires the location information of the UE 21 via the reservation request receiving unit 101, and refers to the location cell table 121 to identify the cell 42 of the base station 41 to which the UE 21, located at the location identified by the location information, is connected.

At this time, for example, as described with reference to FIG. 3, the cell reference unit 102 searches the location cell table 121 using the location information of the UE 21 described as "geomesh" to identify the cell candidates described in "cellList". As a result, the first cell information is output.

In step S23, the value of variable i, which is used as a number assigned to each of the cells identified in step S22, is set to 1.

In step S24, the transmission schedule generation unit 103 executes a transmission schedule generation process for the i-th cell. This determines whether or not the BDT corresponding to the reservation request can complete transmission within the execution time period specified in the reservation request. If it is determined that the transmission can be completed within the execution time period, for example, a transmission schedule as described with reference to FIG. 5 is generated.

In step S25, the impact calculation unit 104 executes an impact calculation process for the i-th cell. This determines whether the i-th cell satisfies the lower limit requirement for throughput when the BDT of the reservation request received in step S21 is executed.

In step S26, the reservation suitability determination unit 105 stores the suitability of the reservation of the i-th cell. The suitability of the reservation may be indicated, for example, by a first flag and a second flag obtained as a result of the processing of steps S24 and S25.

In step S27, it is determined whether the value of variable i has reached the upper limit (Max).

For example, if the number of cells identified in step S22 is 2, then 2 becomes the upper limit. If it is determined in step S27 that the value of variable i has not yet reached the upper limit (Max), then in step S29 the value of variable i is incremented by 1. After that, the processes in steps S24 to S27 are repeatedly executed.

If it is determined in step S27 that the value of variable i has reached its upper limit, the process proceeds to step S28.

In step S28, the reservation acceptance/rejection determination unit 105 executes a reservation acceptance/rejection determination process. This determines whether to accept or reject the reservation request received in step S21, and notifies the UE 21 and the application server 60 of the result.

This is how the reservation request acceptance process is carried out.

(Flow of transmission schedule generation process)
Next, a detailed flow of the transmission schedule generation process in step S24 in Fig. 7 will be described below. Fig. 8 is a flowchart illustrating an example of the transmission schedule generation process.

In step S41, the transmission schedule generation unit 103 identifies the first throughput.

At this time, the transmission schedule generating unit 103 identifies the transmission start time based on, for example, information indicating the execution time period included in the reservation request. The transmission schedule generating unit 103 also refers to the cell/time period throughput table 122 to identify the first throughput, which is the predicted throughput for the time period after the cell transmission start time identified by the information supplied from the cell querying unit 102.

In step S42, the transmission schedule generation unit 103 determines whether the transmission of the BDT will be completed during the execution time period of the reservation request.

At this time, the transmission schedule generation unit 103 determines the transmission completion time when the transmission of the amount of data included in the reservation request is started at the transmission start time, and determines whether the transmission of the BDT will be completed within the execution time period of the reservation request.

If it is determined in step S42 that the task will be completed within the execution time period, the process proceeds to step S43.

In step S43, the transmission schedule generation unit 103 generates a transmission schedule. At this time, for example, for the i-th cell, a transmission schedule such as that shown in FIG. 5 is generated.

In step S43, the transmission schedule generation unit 103 sets a first flag, which indicates whether transmission during the execution time period can be completed, to ON.

On the other hand, if it is determined in step S42 that the execution will not be completed within the execution time slot, the process proceeds to step S45. In step S45, the transmission schedule generating unit 103 sets the first flag to OFF.

In this way, the transmission schedule generation process is executed.

(Flow of impact calculation process)
Next, a detailed flow of the influence calculation process in step S25 in Fig. 7 will be described below. Fig. 9 is a flowchart illustrating an example of the influence calculation process.

In step S61, the influence calculation unit 104 determines whether the first flag is set to ON. If it is determined in step S61 that the first flag is set to ON, the process of step S62 is executed.

In step S62, the influence calculation unit 104 calculates the second throughput for the i-th cell.

At this time, the impact calculation unit 104, for example, refers to the transmission schedule generated in step S43 of FIG. 8 to calculate the amount of throughput reduction caused by executing the BDT of the reservation request in the i-th cell. Then, the impact calculation unit 104 calculates the second throughput of the i-th cell in the time slot by subtracting the amount of reduction calculated corresponding to the number of BDTs executed in the time slot from the first throughput stored in the cell/time slot throughput table 122.

The impact calculation unit 104 calculates the second throughput at each time (e.g., every minute) between the transmission start time and the transmission completion time of the transmission schedule created based on the reservation request.

In step S63, the influence calculation unit 104 determines whether the second throughput calculated in step S62 is equal to or greater than a threshold value. If it is determined in step S63 that the second throughput is equal to or greater than the threshold value, the process proceeds to step S64.

In step S64, the impact calculation unit 104 sets a second flag indicating whether the second throughput lower limit requirement is met to ON.

On the other hand, if it is determined in step S63 that the difference is less than the threshold, the process of step S66 is executed, and the influence calculation unit 104 sets the second flag to OFF.

Also, if it is determined in step S61 that the first flag is not on, the processing in steps S61 to S65 is skipped.

This is how the impact calculation process is carried out.

(Flow of reservation acceptance decision process)
Next, a detailed flow of the reservation acceptance/rejection determination process in step S26 of Fig. 7 will be described below. Fig. 10 is a flowchart illustrating an example of the reservation acceptance/rejection determination process.

In step S81, the reservation acceptance/rejection determination unit 105 determines whether the second flag is set to ON in all cells. If it is determined in step S81 that the second flag is set to ON in all cells, the process proceeds to step S82.

In step S82, it is determined whether the customer agrees to the reservation details. Here, for example, the contents of the reservation request received in step S21 of FIG. 7 are sent again to the customer to determine whether a response indicating agreement has been received. Note that the process of step S82 may not be executed.

If it is determined in step S82 that the reservation details are agreed to, the process proceeds to step S83. On the other hand, if it is determined in step S82 that the reservation details are not agreed to, the reservation acceptance/rejection determination process ends.

In step S83, the reservation acceptance/rejection determination unit 105 accepts the reservation request received in step S21.

In step S84, the reservation acceptance determination unit 105 writes the information included in the accepted reservation request to the reservation table 123. At this time, the reservation acceptance determination unit 105 writes reservation information including the identification information of the cell specified by the information supplied from the cell inquiry unit 102 and the information included in the accepted reservation request to the reservation table 123.

On the other hand, if it is determined in step S81 that the second flag is not set to ON in any cell, the process proceeds to step S85. In step S85, the reservation acceptance determination unit 105 rejects the reservation request received in step S21.

In step S86, the reservation acceptance/rejection determination unit 105 notifies the UE 21 and the application server 60 of the decision to accept or reject the reservation request.

In this manner, the reservation acceptance/rejection determination process is executed. In the example of FIG. 10, for example, if the BDT of the transmission schedule can complete transmission in the execution time slot specified in the reservation request in all of the cells identified in step S22, and the second throughput in all of those cells is equal to or greater than the threshold value, the reservation acceptance/rejection determination unit 105 accepts the reservation request.

(Another example of reservation availability decision process)
On the other hand, if the transmission can be completed in the specified execution time slot in any of the cells identified in step S22 and the second throughput is equal to or greater than the threshold, the reservation request may be accepted. In this case, the detailed flow of the reservation acceptance/rejection decision process in step S26 in Fig. 7 is as shown in Fig. 11. Fig. 11 is a flowchart for explaining another example of the reservation acceptance/rejection decision process.

In step S101, the reservation acceptance/rejection determination unit 105 determines whether the second flag is set to ON in any cell. If it is determined in step S101 that the second flag is set to ON in any cell, the process proceeds to step S102.

In step S102, it is determined whether the customer agrees to the reservation details. Here, for example, the contents of the reservation request received in step S21 of FIG. 7 are sent again to the customer to determine whether a response indicating agreement has been received. Note that the process of step S102 may not be executed.

If it is determined in step S102 that the reservation details are agreed to, the process proceeds to step S103. On the other hand, if it is determined in step S102 that the reservation details are not agreed to, the reservation acceptance/rejection determination process ends.

In step S103, the reservation acceptance/rejection determination unit 105 accepts the reservation request received in step S21 by specifying a cell.

In step S104, the reservation acceptance determination unit 105 writes the information included in the accepted reservation request to the reservation table 123. At this time, the reservation acceptance determination unit 105 writes reservation information including the identification information of the cell that satisfies the requirements and the information included in the accepted reservation request to the reservation table 123.

On the other hand, if it is determined in step S101 that the second flag is not set to ON in any of the cells, the process proceeds to step S105. In step S105, the reservation acceptance determination unit 105 rejects the reservation request received in step S21.

In step S106, the reservation acceptance/rejection determination unit 105 notifies the UE 21 and the application server 60 of the decision to accept or reject the reservation request. When the decision to accept the reservation request is notified, information related to the specified cell is also notified. For example, when the decision to accept the reservation request is notified, the RFSP index corresponding to the specified cell may be notified.

The reservation acceptance/rejection decision process may be executed in this manner.

Next, we will explain the flow of reservation execution control processing by the reservation communication control device. Figure 12 is a flowchart that explains an example of reservation execution control processing.

In step S121, the reservation execution start state confirmation unit 106 determines whether there is a reservation for which transmission will start within a predetermined time (e.g., within one minute) and waits until it is determined that there is a reservation. At this time, for example, the reservation execution start state confirmation unit 106 refers to the reservation table 123 to obtain the transmission start time of each BDT.

If it is determined in step S121 that a reservation to start transmission exists, processing in step S122 is executed.

In step S122, the reservation execution start state confirmation unit 106 identifies the cell to which the UE 21 specified in the reservation request for the BDT that will start transmission within a predetermined time is connected. At this time, the reservation execution start state confirmation unit 106 identifies the cell to which the UE 21 is currently connected, for example, by acquiring location information from the NEF of the core network 50, and generates second cell information including identification information of the identified cell.

In step S123, the execution control unit 107 determines whether or not the cell specified by the second cell information is different from the cell described in the reservation information for the BDT that starts transmission within a predetermined time. If it is determined that the cell specified by the second cell information is different from the cell described in the reservation information, the process of step S124 is executed.

Note that, in step S103 of FIG. 11, if a reservation request is granted by specifying a cell, in step S123, it is determined whether the cell specified by the second cell information is different from the cell specified in the reservation information. That is, in step S123, it is determined whether the cell specified by the second cell information is included in the cells determined by the transmission schedule generation unit 103 as being able to complete the BDT of the reservation request within the execution time slot, and determined by the impact calculation unit 104 as having a second throughput equal to or greater than a threshold value.

In step S124, the execution control unit 107 stops transmitting the BDT.

On the other hand, if it is determined in step S123 that the cell to which UE21 is connected corresponds to one of the cells described (or specified) in the reservation information, the process proceeds to step S125.

In step S125, the execution control unit 107 waits until it is determined that the transmission start time has arrived. If it is determined in step S125 that the transmission start time has arrived, the execution control unit 107 executes the BDT in step S126.

In this way, the reservation execution control process is executed.

(Effects of the First Embodiment)
In this manner, according to the present embodiment, the reservation request is accepted after confirming that the transmission of the BDT related to the reservation request can be completed within the execution time slot, thereby making it possible to avoid the occurrence of a violation of the SLA related to the BDT.

In addition, according to this embodiment, even if a BDT related to a reservation request is executed, the reservation request is accepted after confirming that the cells related to the transmission of the BDT satisfy the lower limit requirement of the throughput. Therefore, it is possible to avoid the deterioration of KPIs due to the execution of the BDT.

Second Embodiment
In the first embodiment, an example has been described in which the cell reference unit 102 searches the location cell table 121 based on the location information transmitted from the UE 21 to identify the cell to which the UE 21 is connected. However, for example, it is also possible to configure the reservation communication control device 80 by omitting the cell reference unit 102 and the location cell table 121.

(Another Configuration Example of the Reservation Communication Control Device)
13 is a block diagram showing another example of the functional configuration of the reservation communication control device 80. In the figure, the same reference numerals are used to denote functional blocks corresponding to those in the first embodiment.

In the example of FIG. 13, unlike the case of FIG. 2, the reservation communication control device 80 is not provided with a cell inquiry unit 102 and a location cell table 121. Also, in this example, the UE 21 transmits to the reservation request receiving unit 101 first cell information including identification information of the cell to which the UE 21 is connected together with or instead of the location information.

The other configurations in Figure 13 are the same as those described above with reference to Figure 2, so detailed explanations will be omitted.

In this case, the transmission schedule generation unit 103 generates a transmission schedule by referring to the first cell information transmitted from UE 21.

That is, the transmission schedule generating unit 103 refers to the cell/time slot throughput table 122 to obtain the predicted throughput for the time slot after the transmission start time of the cell corresponding to the first cell information transmitted from the UE 21. In addition, the transmission schedule generating unit 103 identifies the transmission completion time when the transmission of the amount of data included in the reservation request is started at the transmission start time.

By doing this, it is possible to simplify the configuration of the reservation communication control device 80. In particular, it becomes unnecessary to investigate the electric field strength in order to generate the position cell table 121, and for example, it is possible to reduce the cost of the reservation communication control device 80.

<Other embodiments>
In the above-described embodiment, an example was described in which the start time of the execution time period of the reservation request matches the transmission start time of the transmission schedule, but the start time of the execution time period and the transmission start time do not necessarily have to match.

For example, the transmission schedule generating unit 103 may specify a predetermined time (e.g., one minute) after the start time of the execution time period as the transmission start time.

Alternatively, when the transmission schedule generating unit 103 generates a transmission schedule based on the most recently received reservation request, if the transmission completion time is sufficiently earlier than the end time of the execution time slot, the transmission start time may be delayed. In this way, the transmission schedule generating unit 103 may adjust, for example, the number of BDTs executed in the same time slot to be as small as possible.

<Example of software implementation>
The reservation communication control device 80 described above is a program for causing a computer to function, and can be realized by a program for causing a computer to function as the reservation communication control device 80. In this case, the reservation communication control device 80 includes a computer having at least one control device (e.g., a processor) and at least one storage device (e.g., a memory) as hardware for executing the above program. An example of such a computer is shown in FIG. 14.

The computer 500 includes at least one processor 501 and at least one memory 502. The memory 502 stores a program 520 for operating the computer 500 as a reservation communication control device 80. In the computer 500, the processor 501 reads and executes the program 520 from the memory 502, thereby realizing each function of the reservation communication control device 80.

The processor 501 may be, for example, a CPU (Central Processing Unit), a GPU (Graphic Processing Unit), a DSP (Digital Signal Processor), an MPU (Micro Processing Unit), an FPU (Floating point number Processing Unit), a PPU (Physics Processing Unit), a microcontroller, or a combination of these.

For example, the memory 502 may be a flash memory, a hard disk drive (HDD), a solid state drive (SSD), or a combination of these.

The computer 500 may further include a RAM (Random Access Memory) for expanding the program 520 during execution and for temporarily storing various data. The computer 500 may further include a communication interface for transmitting and receiving data to and from other devices. The computer 500 may further include an input/output interface for connecting input/output devices such as a keyboard, mouse, display, and printer.

The program 520 for causing the computer 500 to operate as the reservation communication control device 80 can be recorded on a non-transitory tangible recording medium 530 that can be read by the computer 500. Such a recording medium 530 can be, for example, a tape, a disk, a card, a semiconductor memory, or a programmable logic circuit. The computer 500 can obtain the program 520 via such a recording medium 530.

The program 520 for causing the computer 500 to operate as the reservation communication control device 80 can be transmitted via a transmission medium. For example, a communication network or broadcast waves can be used as such a transmission medium. The computer 500 can also obtain the program 520 via such a transmission medium.

In addition, some or all of the functions of the reservation communication control device 80 can be realized by logic circuits. For example, an integrated circuit in which a logic circuit that functions as each of the above control blocks is formed is also included in the scope of the present invention. In addition, it is also possible to realize the functions of each of the above control blocks by, for example, a quantum computer.

According to each aspect of the present invention described above, the above-mentioned effects can be achieved, thereby contributing to the achievement of Goal 9 of the Sustainable Development Goals (SDGs), "Build resilient infrastructure, promote inclusive and sustainable industrialization and innovation."

The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. The technical scope of the present invention also includes embodiments obtained by appropriately combining the technical means disclosed in different embodiments.

〔summary〕
A reservation communication control device of aspect 1 of the present invention is a reservation communication control device that controls the reservation of background data transmission (BDT) and the execution of the reservation, and includes a receiving unit that receives a reservation request for BDT related to a terminal device connected to a core network, the reservation request specifying a data capacity and an execution time zone; a first judgment unit that predicts a first throughput, which is the throughput of a cell identified by first cell information and to which the terminal device is connected during the execution time zone of the BDT of the reservation request, and judges whether the BDT of the reservation request can be completed by the cell during the execution time zone; a second judgment unit that predicts a second throughput obtained by subtracting the amount of throughput reduction caused by executing the BDT of the reservation request in the cell from the first throughput, and judges whether the second throughput of the cell is equal to or greater than a threshold; and a reservation acceptance/rejection determination unit that determines whether to accept or reject the reservation request based on the judgment result of the first judgment unit and the judgment result of the second judgment unit.

In the reservation communication control device according to aspect 2 of the present invention, in the above aspect 1, the first determination unit predicts the first throughput based on the throughput of the cell in the execution time slot predicted based on information related to past communications recorded by the core network, and the second determination unit predicts the second throughput by subtracting from the first throughput a reduction amount calculated corresponding to the number of BDTs executed in the execution time slot.

In the reservation communication control device according to aspect 3 of the present invention, in the above aspect 1 or 2, the receiving unit further receives location information of the terminal device, and further includes a location cell table that associates a location corresponding to the location information with a cell that can be connected at the location, and a cell identifying unit that outputs the first cell information by referring to the location cell table, and the cell identifying unit identifies one or more cells that can be connected at the location corresponding to the location information as a cell to which the terminal device will be connected during the execution time period, and outputs the first cell information.

In the reservation communication control device according to aspect 4 of the present invention, in the above aspect 3, the reservation acceptance/rejection determination unit decides to accept the reservation request when the first determination unit determines that the BDT of the reservation request can be completed in the execution time slot for all of the cells included in the first cell information, and the second determination unit determines that the second throughput is equal to or greater than a threshold value for all of the cells.

In the reservation communication control device according to aspect 5 of the present invention, in the above aspect 3, when the first determination unit determines that the BDT of the reservation request can be completed in the execution time slot by one or more cells among the cells included in the first cell information, and the second determination unit determines that the second throughput is equal to or greater than a threshold value in the one or more cells, the reservation acceptance determination unit specifies the one or more cells and decides to accept the reservation request.

In the reservation communication control device according to aspect 6 of the present invention, in the above aspect 1 or 2, the receiving unit further receives the first cell information from the terminal device.

The reservation communication control device according to aspect 7 of the present invention, in any one of aspects 1 to 6 above, further includes an execution start state confirmation unit that acquires from a core network second cell information that identifies a cell to which the terminal device is connected when starting execution of the BDT of the reservation request, and an execution control unit that stops execution of the BDT of the reservation request when the cell identified by the second cell information is not included in the cells that are determined by the first determination unit to be able to complete the BDT of the reservation request within the execution time slot and that are determined by the second determination unit to have the second throughput equal to or greater than a threshold value.

The reservation communication control method according to aspect 8 of the present invention is a reservation communication control method for controlling the reservation of background data transmission (BDT) and the execution of the reservation, and includes the steps of receiving a reservation request for BDT related to a terminal device connected to a core network, the reservation request specifying a data capacity and an execution time slot, predicting a first throughput, which is the throughput of a cell identified by first cell information and to which the terminal device is connected during the execution time slot of the BDT of the reservation request, and performing a first determination to determine whether the BDT of the reservation request can be completed by the cell during the execution time slot, predicting a second throughput obtained by subtracting the amount of throughput reduction caused by executing the BDT of the reservation request in the cell from the first throughput, and performing a second determination to determine whether the second throughput of the cell is equal to or greater than a threshold, and deciding whether to accept or reject the reservation request based on the results of the first determination and the second determination.

The program according to aspect 9 of the present invention causes a computer to function as a reservation communication control device that controls the reservation of background data transmission (BDT) and the execution of the reservation, and includes a receiving unit that receives a reservation request for BDT related to a terminal device connected to a core network, the reservation request specifying a data capacity and an execution time slot, a first determination unit that predicts a first throughput, which is the throughput of a cell identified by first cell information and to which the terminal device is connected during the execution time slot of the BDT of the reservation request, and determines whether the BDT of the reservation request can be completed by the cell during the execution time slot, a second determination unit that predicts a second throughput obtained by subtracting the amount of throughput reduction caused by executing the BDT of the reservation request in the cell from the first throughput, and determines whether the second throughput of the cell is equal to or greater than a threshold, and a reservation acceptance/rejection determination unit that determines whether to accept or reject the reservation request based on the determination result of the first determination unit and the determination result of the second determination unit.

21 UE
Reference Signs List 41 Base station 42 Cell 50 Core network 60 Application server 80 Reservation communication control device 101 Reservation request receiving unit 102 Cell referencing unit 103 Transmission schedule generating unit 104 Influence calculating unit 105 Reservation availability determining unit 106 Reservation execution start state checking unit 107 Execution control unit 121 Position cell table 122 Cell and time slot throughput table 123 Reservation table

Claims (9)

A reservation communication control device that controls a reservation of background data transmission (BDT) and execution of the reservation,
A receiving unit that receives a reservation request for a BDT related to a terminal device connected to a core network, the reservation request specifying a data capacity and an execution time period;
a first determination unit that predicts a first throughput, which is a throughput of a cell identified by first cell information and to which the terminal device is connected during a time period during which the BDT of the reservation request is executed, and determines whether the BDT of the reservation request can be completed by the cell during the time period;
a second determination unit that predicts a second throughput obtained by subtracting a decrease in throughput caused by executing BDT of the reservation request in the cell from the first throughput, and determines whether the second throughput of the cell is equal to or greater than a threshold;
a reservation acceptance/rejection determination unit that determines whether to accept or reject the reservation request based on a determination result of the first determination unit and a determination result of the second determination unit. The first determination unit is
predicting the first throughput based on a throughput of the cell in the execution time slot predicted based on information related to past communications recorded by the core network;
The second determination unit is
The reservation communication control device according to claim 1 , wherein the second throughput is predicted by subtracting a reduction amount calculated corresponding to the number of BDTs executed in the execution time slot from the first throughput. The receiving unit further receives location information of the terminal device,
a position cell table that associates a position corresponding to the position information with a cell that can be connected to the position;
a cell identification unit that outputs the first cell information by referring to the position cell table;
The reservation communication control device according to claim 1 , wherein the cell identification unit identifies one or more cells that can be connected at a position corresponding to the location information as cells to which the terminal device will be connected during the execution time period, and outputs the first cell information. The reservation acceptance/rejection determination unit
The reservation communication control device according to claim 3, wherein when the first judgment unit judges that the BDT of the reservation request can be completed within the execution time period for all of the cells included in the first cell information, and when the second judgment unit judges that the second throughput is equal to or greater than a threshold value for all of the cells, the reservation communication control device decides to accept the reservation request. The reservation acceptance/rejection determination unit
4. The reservation communication control device according to claim 3, wherein when the first judgment unit judges that the BDT of the reservation request can be completed within the execution time period by one or more cells among the cells included in the first cell information, and when the second judgment unit judges that the second throughput in the one or more cells is equal to or greater than a threshold value, the reservation communication control device specifies the one or more cells and decides to accept the reservation request. The reservation communication control device according to claim 1 , wherein the receiving unit further receives the first cell information from the terminal device. An execution start state confirmation unit that acquires second cell information that identifies a cell to which the terminal device is connected when starting execution of the BDT of the reservation request from a core network;
The reservation communication control device of claim 1, further comprising an execution control unit that cancels execution of the BDT of the reservation request when the cell identified by the second cell information is determined by the first judgment unit to be able to complete the BDT of the reservation request within the execution time period and is not included in the cells for which the second judgment unit determines that the second throughput is equal to or greater than a threshold. A reservation communication control method for a reservation communication control device that includes a receiving unit, a first determination unit, a second determination unit, and a reservation permission determination unit, and controls a reservation for background data transmission (BDT) and execution of the reservation, comprising:
A receiving unit receives a reservation request for a BDT related to a terminal device connected to a core network, the reservation request specifying a data capacity and an execution time period;
a first determination unit predicts a first throughput of a cell identified by first cell information, the first throughput being a throughput of a cell to which the terminal device is connected during a time slot during which the BDT of the reservation request is executed, and performs a first determination to determine whether the BDT of the reservation request can be completed by the cell during the time slot;
a second determination unit predicts a second throughput obtained by subtracting a reduction in throughput caused by performing BDT of the reservation request in the cell from the first throughput, and performs a second determination to determine whether the second throughput of the cell is equal to or greater than a threshold;
A reservation acceptance/rejection determination unit determines whether to accept or reject the reservation request based on a result of the first determination and a result of the second determination.
Reservation communication control method. Computer,
A reservation communication control device that controls a reservation of background data transmission (BDT) and execution of the reservation,
A receiving unit that receives a reservation request for a BDT related to a terminal device connected to a core network, the reservation request specifying a data capacity and an execution time period;
a first determination unit that predicts a first throughput, which is a throughput of a cell identified by first cell information and to which the terminal device is connected during a time period during which the BDT of the reservation request is executed, and determines whether the BDT of the reservation request can be completed by the cell during the time period;
a second determination unit that predicts a second throughput obtained by subtracting a decrease in throughput caused by executing BDT of the reservation request in the cell from the first throughput, and determines whether the second throughput of the cell is equal to or greater than a threshold;
a reservation acceptance/rejection determination unit that determines whether to accept or reject the reservation request based on a determination result of the first determination unit and a determination result of the second determination unit.

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