JP6676453B2 - Information processing device - Google Patents

Description

  The present invention relates to an information processing device.

  In LTE (Long Term Evolution), a wireless communication system called 5G has been studied in order to realize a larger system capacity, a higher data transmission speed, and a lower delay in a wireless section. I'm advancing.

  In the era when 5G is realized, it is assumed that a wireless communication system in which cells composed of a plurality of bands having greatly different frequencies are overlaid variously as shown in FIG. 1A will be realized. In the example of FIG. 1B, a macro cell for securing coverage and a small cell / spot cell / moving cell / wireless LAN for securing capacity are overlaid, and the terminal performs C-plane via the macro cell. Communication is performed, and U-plane communication is performed while variously using the small cell / spot cell / moving cell / wireless LAN.

NTT DoCoMo, Inc., "Docomo 5G White Paper", September 2014 3GPP TS25.133 V13.1.0 (2016-03)

  FIG. 2A shows cell selection control (for example, Non-Patent Document 2) for a conventional cellular network. As shown in FIG. 2A, in a conventional cellular network, a terminal connects to a cell having a maximum signal-to-interference plus noise power ratio (SINR) among a plurality of candidate cells. Try.

  In an environment where a large number of buildings are crowded, such as in a large city, the position of the terminal and the moving route of the terminal are greatly affected by the position of the building and the road. In such an environment, the arrangement of cells is restricted, and 5G uses a wider frequency range than before, so that the radio wave propagation environment becomes more complicated than before. Therefore, in the conventional cell selection control for a cellular network, as shown in FIG. 2B, the number of connected terminals is biased between cells, resulting in a decrease in throughput characteristics and a waste of radio resources. It is considered likely.

  The disclosed technology has been made in view of the above, and aims to provide a technology capable of appropriately selecting a connection destination cell among a plurality of candidate cells to which a terminal can connect. .

The information processing device of the disclosed technology is an information processing device that selects a connection destination cell, and is a plurality of cells belonging to a specific band among a plurality of bands and each of a plurality of cells that are connection destination candidates. An acquisition unit for acquiring a first parameter and a second parameter relating to, and a selection unit for selecting a connection destination cell from among the plurality of cells, and wherein the selection unit is a candidate for the connection destination. Of the plurality of cells, the plurality of cells whose first parameter is equal to or more than a predetermined value, by comparing the magnitude of the value of the second parameter for each of the plurality of cells, the second parameter A cell to be connected is selected from a plurality of cells in which one parameter is equal to or more than a predetermined value , and the selection unit is a plurality of cells belonging to any of the plurality of bands and is a candidate for a connection destination. From the plurality of cells Select the cell of the connection destination for each band of the first parameter and at least one of the second parameter for each of the plurality of connection destination cells selected for each of the plurality of bands to the parameter Weighting is performed using a weighting factor for each band, and among the plurality of connection destination cells selected for each of the plurality of bands, the plurality of connection destinations in which the first parameter is equal to or more than a predetermined value. For the cell, by comparing the magnitude of the value of the second parameter for each of the plurality of connected cells, from among the plurality of connected cells where the first parameter is a predetermined value or more, Select the final destination cell .

  According to the disclosed technology, a technology is provided that enables a connection destination cell to be appropriately selected from a plurality of candidate cells to which a terminal can connect.

FIG. 1 is a diagram illustrating an example of a wireless communication system in which cells are variously overlaid. It is a figure for explaining a subject. 1 is a diagram illustrating a configuration example of a wireless communication system according to a first embodiment. FIG. 3 is a diagram illustrating an example of a functional block configuration of a management device according to the first embodiment. FIG. 2 is a diagram illustrating an example of a hardware configuration of a management device according to the first embodiment. 5 is a flowchart illustrating an example of a processing procedure performed by the management device according to the first embodiment. FIG. 9 is a diagram for describing a specific example (1-1) of a selection method according to the first embodiment. FIG. 3 is a diagram illustrating an example of an average communication speed. FIG. 9 is a diagram for describing a specific example (1-2) of the selection method according to the first embodiment. It is a figure for explaining the example (the 1-3) of the selection method concerning a 1st embodiment. It is a figure for explaining a subject. FIG. 14 is a diagram illustrating an example of a functional block configuration of a management device according to a second embodiment. 13 is a flowchart illustrating an example of a processing procedure performed by the management device according to the second embodiment. FIG. 5 is a diagram illustrating an example of weight distribution for each evaluation index indicating characteristics of each band. FIG. 9 is a diagram illustrating an example of weight distribution indicating a relationship between a feature of a terminal or a service and an evaluation index indicating characteristics of each band. It is a figure showing the example of calculation of a weight coefficient. FIG. 11 is a diagram for describing a specific example of a selection method when the number of connected terminals is corrected. FIG. 9 is a diagram for explaining a specific example of a selection method when SINR is corrected. FIG. 11 is a diagram for describing a specific example of a selection method when an available band is corrected.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments. The wireless communication system according to the present embodiment uses a cellular system using a radio access technology (RAT: Radio Access Technology) such as UMTS, LTE, LTE-A or 5G, and a radio access technology such as a wireless LAN. It can be applied to any wireless communication system including the system.

<< First Embodiment >>
<System configuration>
FIG. 3 is a diagram illustrating a configuration example of the wireless communication system according to the first embodiment. The wireless communication system according to the first embodiment includes a management device 10, a base station 20a, a base station 20b, a base station 20c, a base station 20d, and a terminal 30, and includes a plurality of bands having different frequencies. Cells are overlaid in various ways. In the following description, when the base station 20a, the base station 20b, the base station 20c, and the base station 20d are not distinguished, they are described as "base station 20". Although one terminal 30 is shown in FIG. 3, for convenience, a plurality of terminals 30 may exist in the wireless communication system.

  The management device 10 is connected to the base stations 20a to 20d, and various parameters (for example, the reception quality of the cell measured by the terminal 30, the number of connected terminals of each cell, etc.) relating to the cells existing in the wireless communication system, the terminal 30 It manages the characteristics of each cell, the service used by the terminal 30, and the traffic state of each cell. The management device 10 includes a core network device (switch, HSS, etc.), a server connected to the core network, and the like.

  The base station 20a forms a macro cell using the UHF band, the base station 20b forms a small cell using the SHF band, the base station 20c forms a spot cell / moving cell using the EHF band, and the base station 20d Form a cell using a wireless LAN or the like. These cells are assumed to be cells of different bands. In FIG. 3, cells of four bands are overlaid. However, the present wireless communication system may have a configuration in which cells of five or more bands are overlaid, or cells of three or less bands are overlaid. May be used. Although one macro cell is shown in the example of FIG. 3, a plurality of macro cells may be included.

  Further, in the first embodiment, it is assumed that the macro cell is the LTE system, and the small cell and the spot cell / moving cell are new communication systems under consideration for 5G. However, the present invention is not limited to this. The radio access technology (RAT) used in each band may be the same or a different radio access technology. The radio access technology used in each band may be any technology, such as GSM (registered trademark), UMTS, LTE, LTE-A, 5G, wireless LAN, or WiGig (IEEE 802.11ad). is there. That is, FIG. 3 is merely an example, and the embodiment described below is not intended to be limited to this. The present radio communication system may have a configuration in which cells using various radio access technologies (RATs), such as a new communication method under consideration for the LTE method and 5G, and a wireless LAN method, are overlaid.

  The terminal 30 has a function of connecting to one or a plurality of cells and communicating with the base station 20 and the management device 10. Note that “connected to a cell” includes being in the cell, attaching to the cell, HOing the cell, reconnecting to the cell, and the like.

  In the present wireless communication system, the management apparatus 10 selects a connection destination cell (hereinafter, “connection destination cell”) from a plurality of candidate cells to which the terminal 30 can connect in each band (hereinafter, referred to as “connection candidate cell”). Terminal 30), and the terminal 30 performs communication by connecting to the connection destination cell selected by the management device 10. Note that the connection destination cell selection process performed by the management device 10 is not limited to the management device 10 and can be executed by any of the base station 20 and the terminal 30. In the following description, it is assumed that the management apparatus 10 performs the selection process of the connection destination cell. However, each function of the management apparatus 10 may be implemented in the base station 20 or may be implemented in the terminal 30. Good.

<Function block configuration>
FIG. 4 is a diagram illustrating an example of a functional block configuration of the management device according to the first embodiment. As illustrated in FIG. 4, the management device 10 includes a communication unit 101, an acquisition unit 102, and a selection unit 103. FIG. 4 shows only main functional units according to the first embodiment, and has, for example, a function (not shown) for performing an operation corresponding to various radio access technologies. Each of these units can be realized by a process that causes the CPU 101 to execute one or more programs installed in the management device 10.

  The communication unit 101 has a function of transmitting and receiving data wirelessly or wiredly. The acquisition unit 102 has a function of acquiring various parameters for each of the connection candidate cells. For example, the acquisition unit 102 may acquire the first parameter and the second parameter for each of the connection candidate cells belonging to a specific band among a plurality of bands.

  The selection unit 103 has a function of selecting a connection destination cell from connection candidate cells. In addition, the selecting unit 103 compares the magnitude of the value of the second parameter for each of the plurality of cells, for a plurality of cells whose first parameter is equal to or greater than a predetermined value, among the connection candidate cells. Alternatively, a connection destination cell may be selected from a plurality of cells whose first parameter is equal to or greater than a predetermined value.

<Hardware configuration>
FIG. 4 shows blocks in functional units. These functional blocks (components) are realized by an arbitrary combination of hardware and / or software. The means for implementing each functional block is not particularly limited. That is, each functional block may be realized by one device physically and / or logically coupled, or two or more devices physically and / or logically separated from each other directly and / or indirectly. (For example, wired and / or wireless), and may be realized by the plurality of devices.

  For example, the management device 10 according to the first embodiment may function as a computer that performs the processing of the processing method of the present invention. FIG. 5 is a diagram illustrating an example of a hardware configuration of the management device according to the first embodiment. The management device 10 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

  In the following description, the term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configuration of the management device 10 may be configured to include one or more devices illustrated in the drawing, or may be configured without including some devices.

  The functions of the management device 10 are performed by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs an arithmetic operation, communication by the communication device 1004, and communication between the memory 1002 and the storage 1003. This is realized by controlling the reading and / or writing of data in.

  The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured by a central processing unit (CPU) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like. For example, the communication unit 101, the acquisition unit 102, and the selection unit 103 of the management device 10 may be realized by the processor 1001.

  In addition, the processor 1001 reads a program (program code), a software module, and data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operation described in the embodiment is used. For example, the communication unit 101, the acquisition unit 102, and the selection unit 103 of the management device 10 may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and other function blocks may be similarly realized. You may. Although it has been described that the various processes described above are executed by one processor 1001, the processes may be executed simultaneously or sequentially by two or more processors 1001. Processor 1001 may be implemented with one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

  The memory 1002 is a computer-readable recording medium, and includes, for example, at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), and a RAM (Random Access Memory). May be done. The memory 1002 may be called a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, and the like that can be executed to execute the processing method according to the first embodiment.

  The storage 1003 is a computer-readable recording medium, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (eg, a compact disk, a digital versatile disk, a Blu-ray). (Registered trademark) disk, smart card, flash memory (for example, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, or the like. The storage 1003 may be called an auxiliary storage device. The storage medium described above may be, for example, a database including the memory 1002 and / or the storage 1003, a server, or any other suitable medium.

  The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like. For example, the communication unit 101 of the management device 10 may be realized by the communication device 1004.

  The input device 1005 is an input device that receives an external input (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like). The output device 1006 is an output device that performs output to the outside (for example, a display, a speaker, an LED lamp, and the like). Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

  Each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured by a single bus, or may be configured by a different bus between the devices.

  The management device 10 includes hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). The hardware may implement some or all of the functional blocks. For example, the processor 1001 may be implemented by at least one of these hardware.

<Processing procedure>
Subsequently, a processing procedure performed by the wireless communication system according to the first embodiment will be specifically described. In the first embodiment, the management device 10 selects a connection destination cell from a plurality of connection candidate cells to which the terminal 30 can connect in a specific band among the plurality of bands.

  FIG. 6 is a flowchart illustrating an example of a processing procedure performed by the management device according to the first embodiment.

  First, the acquisition unit 102 of the management device 10 acquires two types of parameters relating to connection candidate cells for each of a plurality of connection candidate cells in a specific band (S101). Subsequently, the selection unit 103 of the management device 10 selects one connection destination cell based on two types of parameters for each of the plurality of connection candidate cells (S102).

  More specifically, the selection unit 103 extracts a plurality of connection candidate cells in which one of the two types of parameters has a predetermined value or more. Subsequently, the selecting unit 103 compares the value of the other parameter with respect to each of the extracted plurality of connection candidate cells, and determines a connection candidate cell having a large (or small) value of the other parameter as a connection destination. Select as cell. Hereinafter, a plurality of specific examples will be described with reference to the drawings.

(Specific Example of Selection Method (Part 1-1))
In a specific example (part 1-1) of the selection method, two types of parameters relating to the connection candidate cell are reception quality (SINR) of the connection candidate cell and the number of terminals connected to the connection candidate cell (the number of connected terminals). is there.

FIG. 7 is a diagram for explaining a specific example (part 1-1) of the selection method according to the first embodiment. In FIG. 7 (the same applies to other figures), “P ₁ ” means the SINR of the cell having the highest SINR among the connection candidate cells. Further, “CT (Connection Threshold): connection threshold” is a threshold used for excluding a cell having a low SINR from connection candidate cells from selection targets.

In a specific example (1-1) of the selection method, the selection unit 103 selects a connection candidate cell having a SINR equal to or larger than “P ₁ -CT” and a small number of connection terminals as a connection destination cell. The connection candidate cell having a small number of connection terminals may be a connection candidate cell other than the connection candidate cell having the largest number of connection terminals, or may be a connection candidate cell having the smallest number of connection terminals.

In a specific example (1-1) of the selection method, a cell search may be performed by the following method to select a connection candidate cell having a small number of connection terminals as a connection destination cell. First, the selection unit 103 extracts connection candidate cells whose SINR is equal to or greater than “P ₁ -CT” from the connection candidate cells, and “connection candidate cells having a large SINR” in the descending order of the SINR for the extracted connection candidate cells. And the number of connected terminals of the “connection candidate cell having the next highest SINR” are sequentially compared. The selection unit 103 stops the comparison when detecting that the number of connected terminals of the “connection candidate cell having the next highest SINR” is larger than the number of connection terminals of the “connection candidate cell having the highest SINR”. "A connection candidate cell having a large SINR" is selected as a connection destination cell.

This will be specifically described with reference to FIG. In the example of FIG. 7, cells C1 to C4 whose SINR is equal to or more than “P ₁ -CT” are extracted from the cells C1 to C5. The selection unit 103 compares the number of connected terminals of the connection candidate cell (C1) with the highest received SINR and the number of connected terminals of the connection candidate cell (C2) with the second highest SINR among the extracted connection candidate cells. I do. Subsequently, the selection unit 103 compares the number of connected terminals of the connection candidate cell (C2) having the second highest SINR with the number of connection terminals of the connection candidate cell (C3) having the third highest SINR. Here, since the number of connection terminals of the connection candidate cell (C3) having the third highest SINR is larger than the number of connection terminals of the connection candidate cell (C2) having the second highest SINR, the connection candidate having the second highest SINR is provided. Cell (C2) is selected as the connection destination cell.

Further, as another example, the selection unit 103 may select a connection candidate cell having a small number of connection terminals as a connection destination cell by searching for a cell by the following method. First, the selecting unit 103 extracts connection candidate cells whose SINR is equal to or more than “P ₁ -CT” from the connection candidate cells, and “selects a small number of connection terminals” in the descending order of the number of connection terminals for the extracted connection candidate cells. The SINR of the "connection candidate cell" and the SINR of the "connection candidate cell with the next smallest number of connected terminals" are sequentially compared. The selection unit 103 stops the comparison when it detects that the SINR of the “connection candidate cell having the next smaller number of connected terminals” is smaller than the SINR of the “connection candidate cell having the smaller number of connected terminals”. A “connection candidate cell with a small number of connected terminals” may be selected as a connection destination cell.

This will be specifically described with reference to FIG. In the example of FIG. 7, cells C1 to C4 whose SINR is equal to or more than “P ₁ -CT” are extracted from the cells C1 to C5. The selection unit 103 compares the SINR of the connection candidate cell (C4) with the smallest number of connection terminals among the extracted connection candidate cells with the SINR of the connection candidate cell (C2) with the second smallest number of connection terminals. . Subsequently, the selection unit 103 compares the SINR of the connection candidate cell (C2) with the second smallest number of connection terminals with the SINR of the connection candidate cell (C3) with the third smallest number of connection terminals. Here, since the SINR of the connection candidate cell (C3) having the third smallest number of connection terminals is smaller than the SINR of the connection candidate cell (C2) having the second smallest number of connection terminals, the second smallest number of connection terminals is provided. The connection candidate cell (C2) is selected as a connection destination cell.

(Specific example of selection method (No. 1-2))
In a specific example (1-2) of the selection method, two types of parameters regarding the connection candidate cell include the SINR of the connection candidate cell and an available band estimated to be available in the connection candidate cell (hereinafter, “available band”). ). Here, the “band” in the available band is intended to mean either the communication speed (bps) or the band (Hz) as described below.

[When communication speed (bps) is intended]
In recent years, in the Internet and the like, a line having a high communication speed is often called "broad band = high communication speed", which is called a broadband. In this sense, the communication speed (bps) is expressed as a "band". In this case, the “available bandwidth” of the connection candidate cell is calculated by the following equation.
“Available bandwidth” = (Maximum throughput of connection candidate cells per second) − {(Average communication speed of each connection established in connection candidate cells)}
Here, the “average communication speed for each connection” means an average communication speed in a case where the cell is not congested (when there is a free radio resource in the cell). FIG. 8 shows an example of “average communication speed for each connection”. For example, in the case of Web browsing, an average of 3 Mbps is used, and in the case of FTP, an average of 50 Mbps is used. These average communication speeds may be calculated, for example, by averaging the data amount per traffic in a traffic model (Web browsing or FTP traffic model) with the occurrence time.

  For example, in a spot cell having a maximum throughput of 1 Gbps, when 10 FTP connections are established and 20 Web browsing connections are established, the “available bandwidth” is “1000 Mbps− (50 Mbps × 10 + 3 Mbps). × 20) = 440 Mbps ”. When a large number of connections are established in connection candidate cells (that is, when cells are congested), the “available bandwidth” may be less than 0 (negative number). For example, when 20 FTP connections have been established and 20 Web browsing connections have been established, the “available bandwidth” is “1000 Mbps− (50 Mbps × 20 + 3 Mbps × 20) = − 60 Mbps”. In this case, it means that each connection is in a state where the average communication speed shown in FIG. 8 is not obtained (a state in which the user feels that the communication speed is low).

[When the band (Hz) is intended]
The required bandwidth (Hz) for each connection is previously determined based on the average communication speed for each connection (FIG. 8), and the required bandwidth (Hz) for each connection is subtracted from the system bandwidth (Hz). The obtained value is used as an available band. More specifically, the “available bandwidth” is calculated by the following equation.
“Available bandwidth” = (system bandwidth) − {(bandwidth required for each connection established in connection candidate cell)}
Here, the bandwidth (Hz) required for each connection means the bandwidth (Hz) consumed on average when communication is performed at a predetermined communication speed. Since how much bandwidth (wireless resources) is allocated to secure a predetermined communication speed depends on the scheduling method (amount of wireless resources, modulation scheme, and coding rate) of the base station 20, the present embodiment is described. In the embodiment, the bandwidth (Hz) required for each connection may be determined in advance based on the measurement result. As an example, in the case of LTE, the value of RSRQ (Receiving Signal Received Quality) reported from the terminal 30 to the base station 20, the downlink communication speed, and the allocated bandwidth (RB (Resource Block) of PDSCH (Physical Downlink Shared Channel)) By measuring the relationship with (number), it is possible to determine the bandwidth consumed when securing the average communication speed for each connection according to the value of RSRQ. The management device 10 may determine the bandwidth required for each connection by comparing the value of the RSRQ measured by the terminal 30 in each connection with the above measurement result, or may determine the bandwidth required for the RSRQ. The bandwidth required when the value is the average value in the cell may be used. In the latter case, for example, when the value of RSRQ is the average value in the cell, and when the bandwidth consumed to secure the speed of 10 Mbps is 2 MHz, the FTP connection shown in FIG. It can be determined that a bandwidth of 20 MHz is consumed.

  When a large number of connections are established in connection candidate cells (that is, when cells are congested), the “available bandwidth” may be less than 0 (negative number). For example, if the system bandwidth is 200 MHz, it is determined that an average bandwidth of 20 MHz is consumed per FTP connection, and 20 FTP connections are established, the “available bandwidth” is “ 200 MHz− (20 MHz × 20) = − 200 MHz ”. In this case, it means that each connection is in a state where the average communication speed shown in FIG. 8 is not obtained (a state in which the user feels that the communication speed is low).

In a specific example (1-2) of the selection method, the selection unit 103 selects, as a connection destination cell, a connection candidate cell having an SINR of “P ₁ -CT” or more and having a large available band. The connection candidate cell having the largest available band may be a connection candidate cell other than the connection candidate cell having the smallest available band or a connection candidate cell having the largest available band.

Further, in a specific example of the selection method (No. 1-2), a connection candidate cell having a large available band may be selected as a connection destination cell by performing a cell search by the following method. First, the selection unit 103 extracts connection candidate cells whose SINR is equal to or greater than “P ₁ -CT” from the connection candidate cells, and “connection candidate cells having a large SINR” in the descending order of the SINR for the extracted connection candidate cells. And the available band of the “connection candidate cell having the next highest SINR” are sequentially compared. The selection unit 103 stops the comparison when detecting that the available bandwidth of the “connection candidate cell having the next highest SINR” is smaller than the available bandwidth of the “connection candidate cell having the highest SINR”. "A connection candidate cell having a large SINR" is selected as a connection destination cell.

FIG. 9 is a diagram for explaining a specific example (part 1-2) of the selection method according to the first embodiment. This will be specifically described with reference to FIG. In the example of FIG. 9, cells C1 to C4 whose SINR is equal to or more than “P ₁ -CT” are extracted from cells C1 to C5. The selection unit 103 compares the available band of the connection candidate cell (C1) with the highest SINR and the available band of the connection candidate cell (C2) with the second highest SINR among the extracted connection candidate cells. . Subsequently, the selection unit 103 compares the available band of the connection candidate cell (C2) with the second highest SINR with the available band of the connection candidate cell (C3) with the third highest SINR. Subsequently, the selection unit 103 compares the available band of the connection candidate cell (C3) with the third highest SINR with the available band of the connection candidate cell (C4) with the fourth highest SINR. Here, since the available band of the connection candidate cell (C4) having the fourth highest SINR is smaller than the available band of the connection candidate cell (C3) having the third highest SINR, the connection candidate having the third highest SINR is used. Cell (C3) is selected as the connection destination cell.

Further, as another example, the selection unit 103 may select a connection candidate cell having a large available band as a connection destination cell by searching for a cell by the following method. First, the selection unit 103 extracts connection candidate cells whose SINR is equal to or more than “P ₁ -CT” from among the connection candidate cells, and sets “the available bandwidth is small in the order of the available bandwidth of the extracted connection candidate cells. The SINR of the “connection candidate cell” and the SINR of the “connection candidate cell with the next smallest available bandwidth” are sequentially compared. The selection unit 103 stops the comparison when detecting that the SINR of the “connection candidate cell having the next smallest available band” is smaller than the SINR of the “connection candidate cell having the next smallest available band”. “A connection candidate cell having the next smallest number of connected terminals” may be selected as a connection destination cell.

This will be specifically described with reference to FIG. In the example of FIG. 9, cells C1 to C4 whose SINR is equal to or more than “P ₁ -CT” are extracted from cells C1 to C5. The selection unit 103 compares the SINR of the connection candidate cell (C1) having the smallest available band among the extracted connection candidate cells with the SINR of the connection candidate cell (C4) having the second smallest available band. . Here, since the SINR of the connection candidate cell (C4) having the second smallest available band is smaller than the SINR of the connection candidate cell (C1) having the smallest available band, the connection candidate having the second smallest available band is used. The cell (C4) is selected as a connection destination cell.

(Specific Example of Selection Method (Part 1-3))
In the specific example (part 1-3) of the selection method, as in the specific example (part 1-2) of the selection method, two types of parameters regarding the connection candidate cell include the SINR of the connection candidate cell and the availability of the connection candidate cell. Band.

In a specific example of the selection method (part 1-3), the selection unit 103 selects a connection candidate cell whose SINR is equal to or greater than “P ₁ -CT” and whose available bandwidth is equal to or greater than 0 (that is, in the available bandwidth). (A cell with room) is selected as the connection destination cell.

Further, in a specific example (part 1-2) of the selection method, a connection candidate cell having an available bandwidth of 0 or more may be selected as a connection destination cell by performing a cell search by the following method. . First, the selection unit 103 extracts connection candidate cells whose SINR is equal to or more than “P ₁ -CT” from the connection candidate cells, and the available bandwidth is 0 or more in the descending order of SINR for the extracted connection candidate cells. Confirm whether or not. Upon detecting that the available bandwidth is equal to or greater than 0, the selection unit 103 selects a connection candidate cell at that time as a connection destination cell.

FIG. 10 is a diagram illustrating a specific example (1-3) of the selection method according to the first embodiment. This will be specifically described with reference to FIG. In the example of FIG. 10, cells C1 to C4 whose SINR is equal to or more than “P ₁ -CT” are extracted from the cells C1 to C5. The selection unit 103 checks whether or not the available band of the connection candidate cell (C1) having the highest received SINR among the extracted connection candidate cells is equal to or greater than 0. Subsequently, the selection unit 103 checks whether or not the available band of the connection candidate cell (C2) having the second highest received SINR is 0 or more. Here, since the available band of the connection candidate cell (C2) having the second highest SINR is 0 or more, the connection candidate cell (C2) having the second highest SINR is selected as the connection destination cell.

Further, as another example, the selection unit 103 may select a connection candidate cell having an available bandwidth of 0 or more as a connection destination cell by searching for a cell by the following method. First, the selection unit 103 extracts connection candidate cells having an available bandwidth of 0 or more from the connection candidate cells, and sets the SINR to “P ₁ -CT” or more in the ascending order of the available bandwidth of the extracted connection candidate cells. Check if it is. Upon detecting that the SINR is equal to or more than “P ₁ -CT”, the selection unit 103 selects a connection candidate cell at that time as a connection destination cell.

This will be specifically described with reference to FIG. In the example of FIG. 10, cells C2 and C3 whose available bandwidth is 0 or more are extracted from cells C1 to C5. The selection unit 103 checks whether the SINR of the connection candidate cell (C2) having the smallest available band among the extracted connection candidate cells is equal to or more than “P ₁ −CT”. Here, since the SINR of the connection candidate cell (C2) having the smallest available band is equal to or more than “P ₁ -CT”, the connection candidate cell (C2) having the smallest available band is selected as the connection destination cell.

(Supplementary information on specific examples of selection method (1-1 to 1-3))
The value of “CT: connection threshold” used in the specific example (1-1 to 1-3) of the selection method may be fixedly defined in advance, or may be dynamically changed. Good. For example, in a specific example of the selection method (1-1 to 1-3), the selection unit 103 extracts connection candidate cells whose SINR is equal to or more than “P ₁ -CT” from the connection candidate cells. However, if the number of extracted connection candidate cells is smaller than a predetermined number, the CT value may be reduced. This makes it possible to secure a certain number of connection candidate cells.

  Further, the selection unit 103 may increase the value of CT when the number of extracted connection candidate cells is larger than a predetermined number. This makes it possible to reduce the processing load required for cell selection.

In addition, in the specific examples of the selection method (parts 1-1 to 1-3), the selection unit 103 does not extract connection candidate cells whose SINR is equal to or more than “P ₁ -CT” from among the connection candidate cells. , A predetermined number of connection candidate cells may be extracted in descending order of SINR.

  The first embodiment has been described above. According to the first embodiment, when a plurality of connection candidate cells exist in a specific band, it is possible to appropriately select a connection destination cell.

<< Second Embodiment >>
Next, a second embodiment will be described. The conventional cell selection control for cellular networks (Non-Patent Document 2) is based on the premise that characteristics between overlaid cells do not change significantly in the first place. Therefore, in the conventional cell selection control, when a plurality of cells are overlaid, the base station 20 or the switch determines the connection destination cell based on a single index such as the reception quality of the connection candidate cell or the number of connected terminals. I had to choose.

  On the other hand, in a wireless communication system in which cells composed of a plurality of bands having greatly different frequencies are overlaid variously as in the present wireless communication system, characteristics between cells are significantly different, so that only a single index is appropriate. It is considered that there is a high possibility that the cell cannot be connected. For example, as shown in FIG. 11, when four types of cells, a macro cell, a small cell, a spot cell, and a wireless LAN are overlaid, if the SINR is used as an index, the terminal is connected to a low-speed macro cell, and the number of connected terminals is reduced. As an index, it is assumed that the terminal will connect to a wireless LAN cell having a long cell switching time.

  In the second embodiment, in order to solve the above-described problem, it is possible to appropriately select a connection destination cell in an environment where a plurality of cells are overlaid on a plurality of bands. Note that “<system configuration>” and “<hardware configuration>” are the same as those in the first embodiment, and a description thereof will be omitted.

<Function block configuration>
FIG. 12 is a diagram illustrating an example of a functional block configuration of the management device according to the second embodiment. In FIG. 12, functions that are the same as those in the first embodiment are given the same reference numerals, and descriptions thereof are omitted. Also, points that are not particularly mentioned may be the same as in the first embodiment. As illustrated in FIG. 12, the management device 10 includes a communication unit 101, an acquisition unit 102, a selection unit 203, and a calculation unit 204.

  The selection unit 203 has a function of selecting a connection destination cell from connection candidate cells. In addition, the selection unit 203 compares, for a plurality of cells whose first parameters are equal to or greater than a predetermined value, among the connection candidate cells, the magnitude of the value of the second parameter for each of the plurality of cells. Select a connection destination cell from among a plurality of cells whose first parameters are equal to or greater than a predetermined value. In addition, the selection unit 203 selects a connection destination cell for each of a plurality of bands from connection candidate cells for each of a plurality of bands. Further, the selection unit 203 sets a weighting factor for each band for at least one of the first parameter and the second parameter for each of the plurality of connection destination cells selected for each of the plurality of bands. Weighted using, for a plurality of connected cells selected for each of a plurality of bands, for the plurality of connected cells, the first parameter of which is equal to or more than a predetermined value, for the plurality of connected cells By comparing the magnitude of the value of the second parameter for each, the final destination cell is selected from the plurality of destination cells whose first parameter is equal to or greater than a predetermined value.

  The calculation unit 204 has a function of calculating a weight coefficient for each band. A specific calculation method will be described later.

<Processing procedure>
Subsequently, a processing procedure performed by the wireless communication system according to the second embodiment will be specifically described. In the second embodiment, the management device 10 performs a process of selecting one connection destination cell from a plurality of connection candidate cells to which the terminal 30 can be connected, using the same procedure as in the first embodiment. Then, one final connection destination cell is selected from the connection destination cells selected one by one for each band, using the procedure described in the second embodiment.

  In the second embodiment, the management device 10 may select one final connection destination cell from all the bands. For example, when there are four bands as shown in FIG. 3, the management device 10 may select one final destination cell from the four bands.

  Alternatively, the management device 10 may group some bands in advance and select one final connection destination cell from the group. For example, when there are four bands as shown in FIG. 3, and when the UHF band and the EHF band are grouped, the management apparatus 10 sets the UHF band and the EHF band One final destination cell may be selected. In addition, one connection destination cell may be selected from the cells of the wireless LAN. In this case, the terminal 30 can communicate using two cells of the final connection destination cell and the wireless LAN cell in the UHF band and the EHF band.

  Further, the management device 10 may select one connection destination cell from each band. For example, when there are four bands as shown in FIG. 3, the management device 10 selects one connection destination cell from the UHF band, selects one connection destination cell from the SHF band, and sets the EHF band. , One connected cell may be selected, and one connected cell may be selected from the band of the wireless LAN. In this case, the terminal 30 can communicate using four cells.

  FIG. 13 is a flowchart illustrating an example of a processing procedure performed by the management device according to the second embodiment.

  First, the acquisition unit 102 of the management device 10 acquires two types of parameters relating to connection candidate cells for each of a plurality of connection candidate cells in the band (S201). Subsequently, the selection unit 203 of the management device 10 selects one connection destination cell based on two types of parameters for each of the plurality of connection candidate cells (S202). Note that the processing procedure of steps S201 and S202 is the same as steps S101 and S102 in the first embodiment. The management device 10 repeats the processing procedure of step S201 and step S202 until the selection of the connection destination cell is completed for all the bands to be compared (all the bands or all the bands in the group) (S203). Subsequently, the calculation unit 204 calculates a “weight coefficient” for each band to be compared (S204). Here, a method of calculating the weight coefficient will be specifically described with reference to the drawings.

  FIG. 14 is a diagram illustrating an example of weight distribution for each evaluation index indicating the characteristics of each band. The “evaluation index indicating the characteristics of each band” is set such that the total value of the weight distribution is 100 for each evaluation index, and means that a band having a larger value has higher dominance. For example, “(A) System bandwidth for each band” indicates the characteristic of the system bandwidth of each band, and the larger the value of the weight distribution, the larger the bandwidth of the band. Note that the evaluation index shown in FIG. 14 is merely an example, and the present invention is not limited to this.

  FIG. 15 is a diagram illustrating an example of weight distribution indicating a relationship between a feature of a terminal or a service and an evaluation index indicating characteristics of each band. In the table shown in FIG. 15, items indicating characteristics of the terminal or the service are listed on the vertical axis, and (A) to (H) on the horizontal axis correspond to “evaluation indices indicating characteristics of each band” in FIG. 14. Yes, it is. The value of the weight distribution in the table of FIG. 15 indicates which evaluation index among the evaluation indexes indicating the characteristics of each band is adopted / emphasized for each characteristic of the terminal or the service, and is not adopted (not evaluated). The weight distribution of the evaluation index is “0”. For example, in the case of “(i) subscription fee plan: low amount”, the value of (H) is “2” and the values of (A) to (G) are zero. This means that the terminal 30 having a low subscription fee plan attaches importance to the evaluation index of “(H) Network usage fee” and ignores the evaluation indexes of (A) to (G). The table of “weight distribution for each evaluation index indicating the characteristics of each band” in FIG. 14 and the table of “weight distribution indicating the relationship between the characteristics of the terminal or service and the evaluation index indicating the characteristics of each band” in FIG. The table is premised on being stored in a memory or the like of the management device 10 in advance.

  The calculation unit 204 selects one or more items from the table in FIG. 15 according to the characteristics of the terminal 30 and / or the characteristics of the service to be used. For example, when the moving speed of the terminal 30 is low and the terminal 30 uses the voice service, the calculating unit 204 selects the items (b) and (f) in FIG. In addition, for example, when the moving speed of the terminal 30 is high, the terminal 30 uses streaming, and the subscription fee plan is expensive, the calculating unit 204 calculates the (a), (g), and ( h) Select the item. These selection methods are merely examples, and the calculation unit 204 may select an item by any method.

  The calculation unit 204 multiplies the weight distribution of the item corresponding to the characteristic of the selected terminal 30 and / or the characteristic of the service to be used by the weight distribution for each evaluation index indicating the characteristic of each band, and normalizes the multiplication result. Thus, a “weight coefficient” for each band is calculated.

  FIG. 16 is a diagram illustrating an example of calculating a weight coefficient. The example of FIG. 16 shows an example of calculating the weighting factor when the items (b) and (f) of FIG. 15 are selected. The calculation unit 204 calculates a “weight coefficient” for each band by performing calculation for each evaluation index and normalizing the sum.

  The “weight coefficient” is not limited to the above example, and a weight coefficient fixed in advance may be applied. In this case, the same weighting factor may be applied, or a weighting factor biased to a specific band may be applied. For example, when the same weighting factor is applied, the weighting factors for the UHF band: SHF band: EHF band: wireless LAN band are 0.25: 0.25: 0.25: 0.25, respectively. become. Returning to FIG. 13, the description will be continued.

  The selection unit 203 of the management device 10 selects one final connection destination cell from the connection destination cells selected one by one for each band based on the “weight coefficient” (S205).

  More specifically, the selecting unit 203 corrects at least one of the two types of parameters corresponding to each of the connected cells selected one by one for each band using the “weight coefficient”. Then, the connection destination cells selected one by one for each band are regarded as “connection candidate cells” in the first embodiment, so that the final connection is performed using the same selection method as in the first embodiment. Select one destination cell. Hereinafter, a plurality of specific examples will be described with reference to the drawings.

(Specific Example of Selection Method (Part 2-1))
In the following description (the same applies to other specific examples below), the “connection candidate cell” is different from the first embodiment and is used to indicate a connection destination cell selected one by one for each band. Further, unlike the first embodiment, the “destination cell” is used to indicate the “final destination cell” selected from the destination cells selected one by one for each band. .

  In the specific example (2-1) of the selection method, the two types of parameters regarding the connection candidate cell are the SINR of the connection candidate cell and the number of terminals (the number of connected terminals) connected to the connection candidate cell. In addition, the selection unit 203 corrects one or both of the number of connected terminals for each connection candidate cell and the SINR for each connection candidate cell with a “weight coefficient”.

  More specifically, the number of connected terminals after correction (hereinafter, referred to as “corrected number of connected terminals”) is calculated using the formula “number of corrected connected terminals = number of connected terminals × (1−weight coefficient)”. You. For example, when the “weight coefficient” is a value shown in FIG. 16, the number of corrected connection terminals of the connection candidate cell of the UHF band is the number of connection terminals × (1−0.372). The number of corrected connection terminals in the connection candidate cell of the SHF band is the number of connection terminals × (1−0.218). The same applies to other bands.

The corrected SINR (hereinafter, referred to as “corrected SINR”) is calculated using the formula “corrected SINR = SINR + maximum SINR (P ₁ ) × weight coefficient”.

In a specific example (Part 2-1) of the selection method, the selection unit 203 selects a connection in which the SINR (or the corrected SINR) is equal to or more than “P ₁ -CT” and the number of connected terminals (or the number of corrected connected terminals) is small. Select the candidate cell as the connection destination cell. The connection candidate cell having a small number of connection terminals (or the number of corrected connection terminals) may be a connection candidate cell other than the connection candidate cell having the largest number of connection terminals (or the number of correction connection terminals), or the number of connection terminals (or the number of correction connection terminals). The connection candidate cell having the smallest number of terminals may be used.

  Further, in the specific example of the selection method (No. 2-1), the cell search is performed in the same manner as in the specific example of the selection method in the first embodiment (No. 1-1), whereby the number of connected terminals ( Alternatively, a connection candidate cell having a small number of corrected connection terminals) can be selected as a connection destination cell.

FIG. 17 shows a specific example of a selection method when the number of connected terminals is corrected. As shown in the example of FIG. 17, among the connection candidate cells C1 to C5, connection candidate cells C1 to C4 whose SINR is equal to or more than “P ₁ -CT” are extracted. The selection unit 203 determines the number of corrected connection terminals of the connection candidate cell (C1) having the highest SINR and the number of correction connection terminals of the connection candidate cell (C2) having the second highest SINR among the extracted connection candidate cells. Compare. Subsequently, the selection unit 203 compares the corrected connection terminal number of the connection candidate cell (C2) with the second highest SINR with the correction connection terminal number of the connection candidate cell (C3) with the third highest SINR. Subsequently, the selection unit 203 compares the corrected connection terminal number of the connection candidate cell (C3) with the fourth highest SINR with the corrected connection terminal number of the connection candidate cell (C4) with the fourth highest SINR. Here, since the number of corrected connection terminals of the connection candidate cell (C4) having the fourth highest SINR is larger than the number of correction connection terminals of the connection candidate cell (C3) having the third highest SINR, the third highest SINR is provided. The connection candidate cell (C3) is selected as a final connection destination cell.

FIG. 18 shows a specific example of a selection method when the SINR is corrected. As shown in the example of FIG. 18, connection candidate cells C1 to C5 whose corrected SINR is equal to or more than “P ₁ -CT” are extracted from the connection candidate cells C1 to C5. The selection unit 203 determines the number of connection terminals of the connection candidate cell (C1) having the largest corrected SINR and the number of connection terminals of the connection candidate cell (C2) having the second largest corrected SINR among the extracted connection candidate cells. Compare. Subsequently, the selection unit 203 compares the number of connection terminals of the connection candidate cell (C2) with the second highest corrected SINR with the number of connection terminals of the connection candidate cell (C3) with the third highest correction SINR. Here, since the number of connection terminals of the connection candidate cell (C3) having the third highest corrected SINR is larger than the number of connection terminals of the connection candidate cell (C2) having the second highest correction SINR, the correction SINR is second. The large connection candidate cell (C2) is selected as the final connection destination cell.

(Specific Example of Selection Method (Part 2-2))
In the specific example (Part 2-2) of the selection method, the two types of parameters regarding the connection candidate cell are the SINR of the connection candidate cell and the available band of the connection candidate cell. In addition, the selection unit 203 corrects one or both of the SINR of each connection candidate cell and the available bandwidth of each connection candidate cell with a “weight coefficient”.

  More specifically, the available bandwidth after correction (hereinafter referred to as “correctable available bandwidth”) is calculated using the formula “correctable available bandwidth = available bandwidth × (1 + weight coefficient × correction value)”. Is calculated. Here, the “correction value” is a value set when it is desired to adjust the correction amount using the weight coefficient. The “correction value” may not be provided.

The corrected SINR (hereinafter, referred to as “corrected SINR”) is calculated using the formula “corrected SINR = SINR + maximum SINR (P ₁ ) × weight coefficient”.

In a specific example (Part 2-2) of the selection method, the selection unit 103 selects a connection in which the SINR (or the corrected SINR) is equal to or more than “P ₁ -CT” and the usable band (or the corrected usable band) is large. Select the candidate cell as the connection destination cell. The connection candidate cell having a large available band (or corrected usable band) may be a connection candidate cell other than the connection candidate cell having the smallest available band (or corrected usable band), or may be an available band (or corrected usable band). The connection candidate cell having the largest possible band) may be used.

  Further, in the specific example (Part 2-2) of the selection method, the cell search is performed by the same method as the specific example (Part 1-2) of the selection method in the first embodiment, so that the available band ( Alternatively, a connection candidate cell having a large number of corrected usable bands) can be selected as a connection destination cell.

FIG. 19 shows a specific example of a selection method when the available band is corrected. As shown in the example of FIG. 19, among the connection candidate cells C1 to C5, connection candidate cells C1 to C4 whose SINR is equal to or more than “P ₁ -CT” are extracted. The selection unit 203 calculates the corrected available band of the connection candidate cell (C1) having the highest received SINR and the corrected available band of the connection candidate cell (C2) having the second highest SINR among the extracted connection candidate cells. Compare. Subsequently, the selection unit 103 compares the corrected available band of the connection candidate cell (C2) with the second highest SINR with the corrected available band of the connection candidate cell (C3) with the third highest SINR. Subsequently, the selection unit 103 compares the corrected available band of the connection candidate cell (C3) having the third highest SINR with the corrected available band of the connection candidate cell (C4) having the fourth highest SINR. Here, since there is no connection candidate cell having the next highest SINR, the connection candidate cell (C4) having the fourth highest SINR is selected as the connection destination cell.

  The second embodiment has been described above. According to the second embodiment, in an environment where a plurality of cells are overlaid in a plurality of bands to which various RATs can be applied, the selection of a connection destination cell in the terminal 30 and the load distribution control between the cells are appropriately performed. It becomes possible. In addition, by selecting the final connection destination cell using the weight coefficient calculated in consideration of the characteristics of the terminal 30 and / or the characteristics of the service to be used, the optimal connection destination cell for each user is selected. Can be realized.

<Summary>
As described above, according to the embodiment, there is provided an information processing apparatus for selecting a connection destination cell, wherein each of the plurality of cells belonging to a specific band among the plurality of bands and being the connection destination candidates is An acquisition unit for acquiring a first parameter and a second parameter relating to, and a selection unit for selecting a connection destination cell from among the plurality of cells, and wherein the selection unit is a candidate for the connection destination. Of the plurality of cells, the plurality of cells whose first parameter is equal to or more than a predetermined value, by comparing the magnitude of the value of the second parameter for each of the plurality of cells, the second parameter An information processing apparatus is provided that selects a connection destination cell from a plurality of cells in which one parameter is equal to or more than a predetermined value. This information processing apparatus provides a technology that enables appropriate selection of a connection destination cell among a plurality of candidate cells to which a terminal can connect.

  Further, the first parameter is a reception quality of a cell, and the second parameter is a number of connected terminals, or an average per one or more connections established in the cell from a maximum throughput in the cell. The available bandwidth calculated by subtracting the average bandwidth consumed per one or more connections established in the cell from the available bandwidth calculated by subtracting the communication speed or the system bandwidth in the cell. There may be. Thereby, it becomes possible to select a connection destination cell using the reception quality of the cell and the number of connected terminals, or the reception quality of the cell and the two-axis parameters of the available band. Cell selection can be performed more appropriately than targeted cell selection control.

  Further, the selection unit may be configured such that, among the plurality of cells that are candidates for the connection destination, the value of the reception quality of the cell is a predetermined value from the maximum value of the reception quality of the plurality of cells that are candidates for the connection destination. For a plurality of cells that are equal to or greater than a predetermined value obtained by subtracting the threshold value, a cell other than the cell with the largest number of connected terminals for each of the plurality of cells is selected as a connection destination cell. You may. As a result, even if the reception quality of the cell is good, it is possible to exclude the cell having a large number of connected terminals from the connection destination cell.

  Further, the selecting unit selects a connection destination cell for each of the plurality of bands from among a plurality of cells belonging to any of the plurality of bands and being a plurality of connection destination candidates. Weighting is performed using a weighting coefficient for each band for at least one of the first parameter and the second parameter for each of a plurality of connection destination cells selected for each band. Among the plurality of connected cells selected for each of the plurality of bands, for the plurality of connected cells, wherein the first parameter is equal to or greater than a predetermined value, for the plurality of connected cells, By comparing the magnitude of the value of the second parameter, from among the plurality of connection destination cells where the first parameter is equal to or more than a predetermined value, to select the final connection destination cell Good. Accordingly, in an environment where a plurality of cells are overlaid in a plurality of bands to which various RATs can be applied, it is possible to appropriately perform selection of a connection destination cell in the terminal 30 and load balancing control between the cells.

  A calculating unit configured to calculate a weight coefficient for each band, wherein the calculating unit calculates a weight distribution for each evaluation index indicating characteristics of the plurality of bands, and a characteristic of a terminal or a service and the evaluation index. A weight coefficient for each band may be calculated by multiplying the weight by a weight distribution indicating the relationship. As a result, the final connection destination cell can be selected using the weighting factor calculated in consideration of the characteristics of the terminal 30 and / or the characteristics of the service to be used, and the optimal connection destination cell for each user can be selected. Selection can be realized.

  Further, the weight coefficient for each band may be a value predetermined for each band. This makes it possible to deal with a case where a bias is to be applied to a specific band (for example, a case where the terminal 30 is to be concentrated on a specific band).

<Supplement to the embodiment>
In each of the above embodiments, SINR may be replaced with another parameter as long as the parameter indicates the reception quality of the cell. For example, it may be SNR, RSRP, RSSI, or RSRQ.

  The embodiments described above are based on LTE, LTE-A, SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and others The present invention may be applied to a system using an appropriate system and / or a next-generation system extended based on the system.

  The processing procedures, sequences, flowcharts, and the like of each aspect / embodiment described in this specification may be interchanged as long as there is no inconsistency. For example, the methods described herein present elements of various steps in a sample order, and are not limited to the specific order presented.

  The phrase "based on" as used herein does not mean "based solely on" unless stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

  Any reference to elements using designations such as "first," "second," etc., as used herein, does not generally limit the quantity or order of those elements. These designations may be used herein as a convenient way to distinguish between two or more elements. Thus, a reference to a first and second element does not mean that only two elements may be employed therein, or that the first element must somehow precede the second element.

  Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art can understand various modifications, modification examples, alternative examples, substitution examples, and the like. There will be. Although the description has been made using specific numerical examples to facilitate the understanding of the invention, unless otherwise specified, those numerical values are merely examples, and any appropriate values may be used. The division of the items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as needed, or the items described in one item may be replaced by another item. (Unless inconsistent). The boundaries between functional units or processing units in the functional block diagrams do not always correspond to the boundaries between physical components. The operation of a plurality of functional units may be physically performed by one component, or the operation of one functional unit may be physically performed by a plurality of components. The sequence and the flowchart described in the embodiment may be permuted as long as there is no contradiction.

  In each embodiment, the management device 10, the base station 20, or the terminal 30 is an example of an information processing device.

Reference Signs List 10 management device 20 base station 30 terminal 101 communication unit 102 acquisition unit 103, 203 selection unit 204 calculation unit 1001 processor 1002 memory 1003 storage 1004 communication device 1005 input device 1006 output device

Claims (5)

An information processing apparatus for selecting a connection destination cell,
An acquisition unit that acquires a first parameter and a second parameter for each of a plurality of cells, which are a plurality of cells belonging to a specific band among a plurality of bands and are connection destination candidates,
A selection unit that selects a connection destination cell from among the plurality of cells,
Has,
The selection unit, among a plurality of cells that are candidates for the connection destination, for a plurality of cells where the first parameter is equal to or more than a predetermined value, the value of the second parameter for each of the plurality of cells By comparing the size, the first parameter is to select a connection destination cell from among a plurality of cells that are equal to or more than a predetermined value ,
The selection unit includes:
Select a connection destination cell for each of the plurality of bands from among a plurality of cells that are a plurality of cells belonging to any of the plurality of bands and are candidates for a connection destination,
Weighting at least one of the first parameter and the second parameter for each of the plurality of connection destination cells selected for each of the plurality of bands using a weight coefficient for each band Do
Among the plurality of connection destination cells selected for each of the plurality of bands, for the plurality of connection destination cells, wherein the first parameter is equal to or more than a predetermined value, the second connection relating to each of the plurality of connection destination cells. By comparing the magnitudes of the values of the parameters, the first parameter is selected from among the plurality of destination cells that are equal to or greater than a predetermined value, and a final destination cell is selected.
Information processing device. The first parameter is the reception quality of the cell,
The second parameter is an available bandwidth calculated by subtracting the sum of the average communication speed per one or more connections established in the cell from the number of connected terminals or the maximum throughput in the cell. Or the available bandwidth calculated by subtracting the sum of the average bandwidths consumed per one or more connections established in the cell from the system bandwidth in the cell.
The information processing device according to claim 1. The selection unit may be configured such that, among the plurality of cells that are candidates for the connection destination, the value of the reception quality of the cell is a predetermined threshold value from the maximum value of the reception quality of the plurality of cells that are the candidates for the connection destination. For a plurality of cells that are equal to or greater than a predetermined value obtained by subtracting, a cell other than the cell with the largest number of connected terminals for each of the plurality of cells is selected as a connection destination cell,
The information processing device according to claim 2. A calculating unit for calculating a weight coefficient for each band,
The calculation unit calculates a weighting factor for each band by multiplying a weight distribution for each evaluation index indicating characteristics of the plurality of bands and a weight distribution indicating a relationship between a characteristic of a terminal or a service and the evaluation index. calculate,
The information processing device according to claim 1 . The weight coefficient for each band is a value predetermined for each band,
The information processing device according to claim 1 .

Images