JP2017175393A - Communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve quality of experience (QoE) for a radio terminal.SOLUTION: A communication device comprises: transmission data volume calculation means for calculating a data volume transmittable to a radio terminal in a prescribed period; and communication control means for comparing a required value, i.e. a data volume required by the radio terminal with the transmittable data volume and for restraining communication to the radio terminal if the transmittable data volume is less than the required value.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a communication apparatus, and more particularly to a communication apparatus, a base station apparatus, a relay apparatus, and a server apparatus for realizing good QoE in a wireless terminal.

  With the spread of mobile terminals such as smartphones and tablets, mobile data traffic is rapidly increasing, and the need for further increase in capacity of wireless communication systems is increasing. For this reason, mobile communication carriers are promoting the introduction of wireless communication systems such as LTE (Long Term Evolution) that realizes high speed and large capacity, and LTE Advanced that supports higher speed.

  In mobile communication, radio resources such as frequency band and transmission power that can be used for communication are limited. Therefore, efficient use of radio resources is required to achieve high speed and large capacity.

  In mobile communication, management of radio resources is performed by a scheduler of a radio base station. In general, a scheduler of a radio base station assigns radio resources to each radio terminal or each bearer based on quality information of a radio channel periodically fed back from the radio terminal. A bearer is a logical line set between a wireless terminal and a wireless base station, between a wireless terminal and a mobile core network, between a wireless base station and a mobile core network, and the like. The bearers used in LTE include radio bearers and network bearers. Bearers used in LTE include Radio Bearer (Data Radio Bearer (DRB), Signaling Radio Bearer (SRB)), EPS Bearer, E-RAB, S1 Bearer, S5 / S8 Bearer, and the like. EPS is an abbreviation for Evolved Packet System. E-RAB is an abbreviation for E-UTRAN Radio Access Bearer, and UTRAN is an abbreviation for Universal Terrestrial Radio Access Network.

  According to the method disclosed in Non-Patent Document 1, the scheduler of a radio base station allocates radio resources based on a radio resource allocation index (radio resource allocation priority). The radio resource allocation index includes an instantaneous rate that is expected when radio resources are calculated from quality information of a radio channel that is periodically fed back from the radio terminal, and an average rate that is calculated from the transmission history of the radio terminal. , And two.

  In the case of LTE, an allocation index is calculated for each resource block (Resource Block: RB) or resource block group (Resource Block Group: RBG). Here, RB is a minimum allocation unit of frequency blocks that can be allocated to each wireless terminal or each bearer. The RBG is a group of resource blocks including a plurality of RBs.

  Generally, the instantaneous rate used for calculation of an allocation indicator is calculated from CQI (Channel Quality Indicator) included in CSI (Channel State Information) that is quality information of a radio channel fed back from a radio terminal. Generally, an instantaneous rate is a TBS (Transport Block Size) per RB that can be transmitted by MCS (Modulation and Coding Scheme) determined based on radio channel quality converted from CQI. The average rate is a value obtained by averaging the number of transmission bits for each TTI (Transmission Time Interval), which is the minimum time unit for radio resource allocation, and a value obtained by dividing the instantaneous rate by the average rate is used as an allocation index.

  In general, RBs are allocated in order from the radio terminal or bearer with the largest index. Accordingly, priority is given to allocation to RBs having relatively high instantaneous radio channel quality with respect to average radio channel quality. As a result, each wireless terminal can increase the wireless capacity. In addition, since the average rate decreases when radio resources are not allocated, the allocation probability at the next allocation opportunity increases. As a result, even users with poor channel quality do not have fewer allocation opportunities, and fairness of allocation opportunities among users can be realized.

  In recent years, the breakdown of mobile data traffic has diversified. In addition to realizing high speed and large capacity, it is now possible to stably provide each application with good quality of experience (QoE). It is one of the important themes in the competitive strategy of business operators. For this reason, a scheduler taking QoE into account has attracted attention.

  According to the method disclosed in Patent Document 1, the radio base station manages a QoE function indicating a relation between radio resource allocation and QoE for each traffic type. The scheduler of the radio base station identifies the traffic type of each radio terminal, performs temporary allocation of radio resources to the radio terminal by the method disclosed in Non-Patent Document 1, etc., and calculates the QoE function based on the temporary allocation result. To calculate the QoE of each wireless terminal. Then, the scheduler of the radio base station provides a part of the radio resources for which the calculated QoE is temporarily allocated to the radio terminal satisfying the required condition defined for each traffic type within a range where the radio terminal satisfies the predetermined condition. Can be accommodated to a wireless terminal whose calculated QoE cannot satisfy the required condition. As a result, it is possible to improve the QoE of the wireless terminal that cannot satisfy the predetermined condition while satisfying the prescribed QoE for the wireless terminal that satisfies the required condition.

  Furthermore, Patent Document 2 discloses a technique for calculating time spent until transmission of data necessary for maintaining throughput is completed, and performing traffic priority control using the calculated time. Patent Document 3 discloses a technique for performing admission control on a new data flow based on whether or not transmission of the transfer data amount is possible by the data transfer completion request time. Patent Literature 4 discloses a base station device having a function of determining and transmitting the type of reception state information requested of a terminal device based on a data amount index transmitted to the terminal device. Patent Document 5 discloses a technique for evaluating a load-dependent potential coverage hole. Patent Document 6 discloses a technique for suppressing the transmission of data exceeding the processing capability of its own device. Patent Document 7 discloses a technique for reflecting a delay request for an application using TCP in radio resource allocation. Patent Document 8 discloses a technique for performing admission determination based on whether or not the requested transfer data amount can be transferred by the completion request time using the data transfer completion request time and the transfer data amount.

Japanese Patent No. 5011408 JP 2007-235782 A JP 2008-085974 A International Publication No. 2008/133185 JP-A-2015-126405 JP 2011-199406 A JP 2010-200096 A JP 2008-085974 A

Christian Wengerter et al, "Fairness and Throughput Analysis for Generalized Proportional Fair Frequency Scheduling in OFDMA" VTC 2005-Spring. 2005 IEEE 61st (Volume: 3)

  In the scheduler disclosed in Patent Literature 1, radio resources are allocated to each radio terminal without considering whether transmission of data necessary for using an application can be completed. Therefore, when there is a wireless terminal that cannot complete transmission of data necessary for using the application, the wireless resources allocated to the wireless terminal that cannot be completed are wasted, and as a result, some wireless resources are effectively used. It wasn't.

  A communication area (coverage) in which a wireless base station can perform wireless communication with a wireless terminal is called a cell. In the vicinity of the cell boundary, the quality (reception quality) of the radio signal received by the radio terminal deteriorates due to interference caused by radio signals from adjacent radio base stations. In addition, when a handover occurs in which radio base stations to be communicated are generated, a time of several tens of milliseconds to several hundreds of milliseconds during the handover process occurs, and a time during which wireless communication cannot be performed occurs. Furthermore, when the handover fails, the radio link is disconnected (Radio Link Failure: RLF), and the radio communication cannot be performed until the radio terminal recovers the radio communication with the radio base station. On the other hand, in areas such as building shadows and indoors, radio signals transmitted by radio base stations are greatly attenuated, and reception quality deteriorates. If the reception quality deteriorates before the required value can be satisfied, RLF occurs. An area where the reception quality deteriorates before the required value is not satisfied is called a dead zone (coverage hole). For example, a tunnel is a typical example of an area where a coverage hole is formed.

  When the wireless terminal moves to the above-described area, the wireless channel quality (wireless section throughput: wireless communication speed between the wireless terminal and the wireless base station) deteriorates. Note that the degradation of the wireless section throughput occurs similarly when the number of wireless terminals that perform wireless communication with the wireless base station increases and the wireless resources allocated to one wireless terminal decrease.

  If data transmission to a wireless terminal takes too long due to degradation of wireless section throughput, communication between the wireless terminal and the server device is performed before the data transmission necessary for using the application is completed. There is a possibility of timeout. As a result, wireless communication between the wireless terminal and the wireless base station can be forcibly terminated. In addition, since it takes too much time to transmit data, a user using the wireless terminal may give up using the application. In this case, the wireless communication between the wireless terminal and the wireless base station may also be terminated when the user terminates the communication with the server device without waiting for completion of transmission of data necessary for using the application.

  At this time, the scheduler disclosed in Patent Document 1 allocates radio resources to the radio terminal until the above-described radio communication is completed. With the amount of data transmitted with the radio resources allocated until the end of wireless communication, the application cannot be used in the wireless terminal, and the data will be discarded. Wireless resources are wasted.

  The waste of radio resources described above causes a reduction in radio resources allocated to radio terminals other than the radio terminal. As a result, the QoE of wireless terminals other than the wireless terminal decreases due to a decrease in wireless section throughput. Further, such waste of radio resources causes useless power consumption for a radio base station that performs radio communication with the radio terminal.

Patent Documents 2 to 8 all disclose a technique for solving the problem that the QoE of a radio terminal is reduced due to waste of radio resource allocation in communication between the radio terminal and the radio base station. Not done.
[Object of invention]
An object of the present invention is to provide a communication system that can improve the QoE of a wireless terminal.

  The communication apparatus of the present invention includes a transmission data amount calculation means for calculating a data amount that can be transmitted to a wireless terminal during a predetermined period, a required value that is a data amount required in the wireless terminal, and the transmission possible And a communication control unit that suppresses communication with the wireless terminal when the amount of data that can be transmitted is less than the required value.

  The communication system of the present invention includes a transmission data amount calculation means for calculating a data amount that can be transmitted to a wireless terminal during a predetermined period, a required value that is a data amount required in the wireless terminal, and the transmission possible A base station apparatus comprising: a first communication control unit that compares the amount of data that can be transmitted and notifies the wireless terminal that the amount of data that can be transmitted is less than the required value; and the wireless terminal A relay device including a second communication control unit that suppresses communication with the wireless terminal to which the information related to is notified.

  The communication device control method of the present invention calculates a data amount that can be transmitted to the wireless terminal during a predetermined period, and a required value that is a data amount required in the wireless terminal and the transmittable data. When the amount of data that can be transmitted is less than the required value, communication with the wireless terminal is suppressed.

  The present invention can improve the QoE of a wireless terminal.

It is a figure showing the structure of the communication system in 1st Embodiment. It is a figure showing the function of the radio base station in 1st Embodiment. It is a figure showing the process sequence of the transmission data amount calculation part in 1st Embodiment. It is a figure showing the process sequence of the communication control part in 1st Embodiment. It is a figure showing the process sequence which suppresses allocation of the radio | wireless resource in the modification of 1st Embodiment. It is a figure showing the structure of the communication system in 2nd Embodiment. It is a figure showing the function of the radio base station and relay apparatus in 2nd Embodiment. It is a figure showing the process sequence of the transmission data amount calculation part in 2nd Embodiment. It is a figure showing the structure of the communication system in 3rd Embodiment. It is a figure showing the function of the radio base station and relay apparatus in 3rd Embodiment. It is a figure showing the structure of the communication system in 4th Embodiment. It is a figure showing the function of the wireless base station in 4th Embodiment. It is a figure showing the structure of the communication system in 5th Embodiment. It is a figure showing the function of the wireless base station in 5th Embodiment. It is a figure showing the process sequence of suppressing or giving priority to allocation of the radio | wireless resource in 5th Embodiment.

[First embodiment]
Next, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the reference numerals on the drawings referred to in the description of the embodiments of the present invention including this embodiment and the arrows between the elements of the system are added for convenience to each element as an example for facilitating understanding, This summary is not intended to be limiting in any way.

[Description of configuration]
FIG. 1 shows a configuration of a communication system 1 according to the first embodiment of the present invention. The communication system 1 includes a server device 10, a radio base station 20, and a radio terminal 30. For convenience of explanation, the communication system 1 of the present embodiment includes only one server device, a wireless base station, and a wireless terminal. However, the number of server devices, wireless base stations, and wireless terminals is not limited to one. A radio base station is also called a base station apparatus.

  The server apparatus 10 and the radio base station 20 are configured to communicate via a communication line NW (Network). The communication line NW is described as “NW” in FIG. 1 and includes at least an external network such as the Internet and a mobile core network. Further, the radio base station 20 and the radio terminal 30 are configured to communicate via a mobile access network. In description of embodiment of this invention including this embodiment, a mobile core network and a mobile access network assume the mobile core network and mobile access network in a LTE radio | wireless system. However, mobile core networks and mobile access networks in wireless systems other than LTE, such as UMTS and GSM (registered trademark), may be assumed.

  The LTE wireless system is also called RAT (Radio Access Technology). The mobile core network is also called EPC (Evolved Packet Core). The mobile access network is also called EUTRAN (Evolved UMTS Terrestrial Radio Access Network) or UTRAN. UMTS is an abbreviation for Universal Mobile Telecommunications System, and GSM is an abbreviation for Global System for Mobile communications.

  The mobile core network and the mobile access network may be separate wireless systems. For example, the mobile core network is an EPC in an LTE wireless system, and the mobile access network is a wireless device other than LTE, such as WiFi, wireless LAN, or WiMAX. It is good also as a system. Note that WiFi is an abbreviation for Wireless Fidelity, LAN is an abbreviation for Local Area Network, and WiMAX is an abbreviation for Worldwide Interoperability for Microwave Access.

  The server device 10 is a device that provides various communication services to the wireless terminal 30. The server device 10 may be, for example, a WWW server, FTP server, mail server, file server, database server, application server, streaming server, DNS server, proxy server, edge server, or the like. WWW stands for World Wide Web, FTP stands for File Transfer Protocol, and DNS stands for Domain Name System. The server device 10 includes an information processing device and a communication interface (not shown). The information processing device of the server device 10 includes a central processing unit (CPU) and a storage device (memory and hard disk drive (HDD)) not shown. The server device 10 may realize a function of providing a communication service to the wireless terminal 30 by causing the CPU to execute a program stored in the storage device. Since these functions of the server device 10 are well known to those skilled in the art, description of each component of the server device 10 is omitted.

  The radio base station 20 includes an information processing device and a transceiver (transmitter and receiver) not shown. The information processing apparatus of the radio base station 20 includes a central processing unit (not shown) and a storage device (memory and HDD). The radio base station 20 may realize a function to be described later when the CPU executes a program stored in the storage device.

  The wireless terminal 30 is, for example, any one of a mobile phone terminal, a personal computer, a smartphone, a tablet terminal, a car navigation terminal, and a game terminal. PHS is an abbreviation for Personal Handyphone System, and PDA is an abbreviation for Personal Data Assistant or Personal Digital Assistant. The wireless terminal 30 includes a CPU, a storage device (memory), a transceiver (transmitter and receiver), an input device (for example, a key button and a microphone), and an output device (for example, a display and a speaker). The wireless terminal 30 executes a function stored in the server device 10 via the wireless base station 20 and various communication services provided by the server device 10 when the CPU executes a program stored in the storage device. A function may be realized. Further, the wireless terminal 30 is connected to the wireless terminal 30 by the CPU executing the program stored in the storage device (communication link (for example, RRC (Radio Resource Control) Connection) is established). A function of transmitting and receiving radio signals between the radio base stations 20 may be realized. Based on the measurement setting information received from the radio base station 20, the CPU of the radio terminal 30 measures CQI, RSRP, RSRQ, etc., which are reception quality indicators of the reference signal transmitted by the radio base station 20, and connects to the connected radio base station. You may comprise so that the function with which the radio | wireless terminal 30 is provided, such as the function to notify (measurement report, Measurement Report) to the station 20, is provided. RSRP is an abbreviation for Reference Signal Received Power, and RSRQ is an abbreviation for Reference Signal Received Quality. Since the functions of the wireless terminal 30 described above are well-known matters for those skilled in the art, description of each component of the wireless terminal 30 is omitted.

  FIG. 2 is a block diagram showing functions of the radio base station 20 in the communication system 1 configured as described above.

  The radio base station 20 includes a basic function unit 201, a transmission data amount calculation unit 202, and a communication control unit 203. The functions of the radio base station 20 are realized by these units.

  In the description of the embodiments of the present invention including this embodiment, among the functions provided in the radio base station in the general radio communication system, the radio resource management function is provided in the communication control unit 203. Regarding functions, the basic function unit 201 is provided. As described above, the operations of the following functional units are realized by a processor (for example, CPU), a transceiver (transmitter and receiver), and a storage device (for example, memory) included in the radio base station 20 operating in cooperation with each other. .

  The basic function unit 201 has a function of transmitting / receiving a radio signal to / from the radio terminal 30 that is connected to the radio base station 20 (a communication link is established), and a communication path between the radio terminal 30 and the radio base station 20. It has a function of generating a reference signal used for measuring quality. Note that at least part of the functions of the basic function unit 201 (for example, a function of transmitting and receiving a radio signal) may be referred to as a communication unit. The basic function unit 201 is further notified of the function of accumulating transmission data addressed to each wireless terminal 30 arriving via the communication line NW, the function of acquiring and managing the QCI related to the transmission data, and the wireless terminal 30 CQI, RSRP, and RSRQ. The basic function unit 201 additionally has a function of managing the history of the wireless section throughput of the wireless terminal 30 and a wireless base such as the PRB usage rate and the number of wireless terminals 30 connected to the wireless base station 20 (the number of active UEs). The station 20 also has a function of measuring and managing information that can be measured. QCI is an abbreviation for QoS (Quality of Service) Class Identifier, and PRB is an abbreviation for Physical Resource Block. These functions are functions provided in a radio base station in a general radio communication system. In addition, since the function with which the basic function part 201 is provided is a well-known matter of those skilled in the art, description of each function with which the basic function part 201 is provided is abbreviate | omitted.

  The transmission data amount calculation unit 202 uses the future wireless section throughput of the wireless terminal 30 calculated by the least square method from the wireless section throughput history of the wireless terminal 30 measured and managed by the basic function unit 201, and after a predetermined time has elapsed. It has a function to calculate the amount of data that can be transmitted until. The calculated data amount that can be transmitted before a predetermined time of each wireless terminal 30 is used by the communication control unit 203.

  The communication control unit 203 has an RRC function for controlling a wireless connection state between the radio base station 20 and the radio terminal 30 and a function for calculating an allocation index for each radio terminal 30. The communication control unit 203 further has a function of determining a resource block to be allocated to each wireless terminal 30 based on the calculated allocation index. As described above, the communication control unit 203 has a radio resource management function included in a radio base station in a general radio communication system. In addition, since the above-mentioned function is a well-known matter of those skilled in the art, description of each function is omitted. The communication control unit 203 further has a function of suppressing communication to the wireless terminal 30 using the data amount that can be transmitted before the predetermined time calculated by the transmission data amount calculation unit 202 elapses. Have. In the present embodiment, by suppressing the allocation of radio resources to the radio terminal 30 whose data amount is less than the required value, communication with the radio terminal 30 is suppressed.

[Description of operation]
Next, an operation procedure in which the radio base station 20 suppresses communication of the radio terminal 30 will be described.

  FIG. 3 illustrates a case where the transmission data amount calculation unit 202 of the radio base station 20 is connected to the radio terminal 30 that is connected to the radio base station 20 (a communication link (for example, RRC (Radio Resource Control) Connection) is established). FIG. 5 is a flowchart showing an operation procedure for calculating the amount of data that can be transmitted before a predetermined time elapses. The radio base station 20 executes the operation illustrated in FIG. 3 at every predetermined period. In this embodiment, the radio base station 20 executes the operation of FIG. 3 every 5 [seconds]. The execution cycle of the procedure in FIG. 3 is arbitrary.

  First, the transmission data amount calculation unit 202 uses the least square method to determine the relationship between the wireless section throughput and time from the wireless section throughput history of the wireless terminal 30 that is measured and managed by the basic function unit 201 of the wireless base station 20. An approximate curve (linear equation) is obtained (step S101). Formula (1) is a linear equation related to wireless section throughput and time obtained using the least square method.

In Equation (1), t _curr is the current time, and R _t is the radio interval throughput at time t. Moreover, a and b are variables, and are calculated using Equation (2) and Equation (3), respectively. In Expressions (2) and (3), N is the total number of samples of the wireless section throughput of the wireless terminal 30 measured by the basic function unit 201, and i is an identification number for identifying each of the wireless section throughputs. It is. t _i (≦ t _curr ) is a time when the wireless section throughput of the identification number i is measured.

  In the present embodiment, the total number of samples N is 100, but may be a value larger than 100 or a value smaller than 100. The measurement of the wireless section throughput executed by the basic function unit 201 is periodic and the period is 100 [milliseconds], but may be executed with a period shorter than 100 [milliseconds]. , 100 [milliseconds], or may be executed at an appropriate timing.

・・・数式（１）

... Formula (1)

・・・数式（２）

... Formula (2)

・・・数式（３）

... Formula (3)

Next, the transmission data amount calculation unit 202 calculates the amount of data D that can be transmitted to the wireless terminal 30 before a predetermined time elapses, using Equation (1) (step S102). Formula (4) is a calculation formula for calculating the amount of data that can be transmitted until the predetermined time t _{elap has} elapsed. In the present embodiment, t _elap is, for example, one of guidelines for constructing a Web site, and is 8 [seconds], which is a time during which the user can wait to display a Web page. t _elap may be shorter than 8 [seconds] or may be longer than 8 [seconds]. Alternatively, t _elap may be a delay time defined by QCI for data addressed to the wireless terminal 30. Alternatively, t _elap may be a statistical value of the time required for the handover process between the radio base stations 20. Alternatively, t _elap is the time from when the handover fails and the connection with the radio base station 20 is lost until the radio base station 20 or another radio base station 20 is reconnected. It may be a statistical value of instantaneous interruption time. Alternatively, t _elap may be a statistical value of time spent in a coverage hole or the like where the reception quality of the radio signal from the radio base station 20 deteriorates. When using these statistical values, the radio base station 20 measures the statistical values.

・・・数式（４）

... Formula (4)

  The “8-second rule” relating to the time that the user can wait for the display of the Web page is described below, for example.

  The Economic Impacts of Unacceptable Web-Site Download Speeds <URL: http://www.webperf.net/info/wp_downloadspeed.pdf>

  The transmission data amount calculation unit 202 performs the above process on all the wireless terminals 30 connected to the wireless base station 20. Thereafter, the transmission data amount calculation unit 202 ends the process of FIG.

  FIG. 4 shows a wireless terminal 30 in which the amount of data that can be transmitted by the communication control unit 203 of the wireless base station 20 to the wireless terminal 30 calculated by the transmission data amount calculation unit 202 after a predetermined time has elapsed is less than the required value. On the other hand, it is a flowchart showing the operation | movement procedure which suppresses communication. After completing the operation of the transmission data amount calculation unit 202, the radio base station 20 performs the operation illustrated in FIG.

First, the communication control unit 203 determines whether or not the data amount D is less than a required value for the wireless terminal 30 in which the transmission data amount calculation unit 202 has calculated the data amount D that can be transmitted before a predetermined time has elapsed. Determination is made (step S201). In Expression (5), D _thresh is a required value, and in this embodiment, it is 2 [MByte] which is the average size of the Web page in the year 2015. This value can be referred to at <URL: http://httparchive.org/index.php>, for example. Note that D _thresh may be a value smaller than 2 [MByte] or may be a value larger than 2 [MByte]. Alternatively, D _thresh may be a statistical value of the amount of data used by the application in the wireless terminal 30 during the time required for the handover process between the wireless base stations 20. Alternatively, D _thresh is the time from when the handover fails and the connection with the radio base station 20 is lost until the radio base station 20 or another radio base station 20 is reconnected. It is good also as a statistical value of the data amount used by the application in the radio | wireless terminal 30 in the momentary interruption time. Alternatively, D _thresh may be a statistical value of the amount of data used by an application in the wireless terminal 30 during the time in which it stays in a coverage hole or the like. Alternatively, D _thresh is a wireless terminal between these current statistics and each event (for example, handover processing between the wireless base stations 20, handover failure, intrusion into coverage hole) from the current time. It is good also as a value which added the statistical value of the data amount utilized by the application in 30. When using these statistical values, the radio base station 20 measures the statistical values.

  In the present embodiment and the subsequent embodiments, “application in the wireless terminal” is an application program that is executed in the wireless terminal 30 and affects QoE. Examples of applications in the wireless terminal include a Web browser, a mail program (mailer), a location information display program, a telephone program, and a short message service program. However, the application in the wireless terminal in each embodiment is not limited to these.

・・・数式（５）

... Formula (5)

  When Expression (5) is satisfied (step S201, YES), the communication control unit 203 determines that the wireless terminal 30 cannot complete transmission of data necessary for using the application due to deterioration in wireless channel quality. Then, the communication control unit 203 determines not to allocate radio resources to the radio terminal 30 (step S202). On the other hand, when Formula (5) is not satisfied (step S201, NO), the communication control unit 203 skips the process of step S202.

  The communication control unit 203 performs the above processing for all the wireless terminals 30 connected to the wireless base station 20. Thereafter, the communication control unit 203 ends the process of FIG.

  As described above, in the first embodiment of the present invention, communication with a wireless terminal that is predicted to be unable to complete transmission of required data is suppressed. As a result, it is possible to effectively use radio resources by allocating radio resources only to radio terminals that can be expected to complete transmission, and to improve QoE of radio terminals that can be expected to complete transmission.

The radio base station 20 illustrated in FIG. 1 includes a basic function unit 201, a transmission data amount calculation unit 202, and a communication control unit 203. The basic function unit 201 performs wireless communication with a wireless terminal. The transmission data amount calculation unit 202 calculates a data amount D that can be transmitted to the wireless terminal 30 before a predetermined time elapses from the current time. The communication control unit 203 compares D _thresh , which is a required value, which is the amount of data required in the wireless terminal 30, and the transmittable data amount D. If D is less than D _thresh , the wireless terminal 30 Suppress communication against

  The radio base station 20 having such a configuration calculates a data amount D that can be transmitted before a predetermined time elapses for each radio terminal, and based on the data amount, transmits data required in the radio terminal. Communication with a wireless terminal that is predicted to be unable to be completed. As a result, since the amount of radio resources allocated to radio terminals other than the radio terminal increases, radio section throughput can be improved.

  The configuration of the first embodiment is not limited to the above-described content, and various changes can be made. For example, in the present embodiment, in step S101, the transmission data amount calculation unit 202 uses the least square method from the wireless section throughput history of the wireless terminal 30, and uses an approximate curve (linear equation) indicating the relationship between the wireless section throughput and time. ) However, the TBS (Transport Block Size) of the wireless terminal 30 may be defined as the wireless section throughput, and an approximate curve (linear equation) indicating the relationship between the wireless section throughput and time may be obtained from the TBS history using the least square method. . In this case, the basic function unit 201 of the radio base station 20 manages the TBS history of the radio terminal 30 instead of the radio section throughput history of the radio terminal 30.

Alternatively, the transmission data amount calculation unit 202 obtains an approximate curve (linear equation) indicating the relationship between MCS and time, and uses the approximate curve and the number of radio terminals 30 connected to the radio base station 20 to perform wireless communication. You may obtain | require the approximated curve (linear equation) which shows the relationship between area | region throughput and time. In this case, the basic function unit 201 of the radio base station 20 manages the history of MCS used for data transmission to the radio terminal 30. Equation (6) is a linear equation related to the wireless interval throughput and time. In Equation (6), TBS () is a function for deriving TBS, which is the amount of data that can be transmitted per unit time. MCS _t is an approximate curve (linear equation) indicating the relationship between MCS and time calculated from the MCS history of the wireless terminal 30 using the least square method. In addition, since the calculation method of the approximate curve using the least square method was demonstrated in step S101, description here is abbreviate | omitted. _NRB is the number of resource blocks corresponding to the system bandwidth (Channel Bandwidth), and is 50 in this embodiment. N _UE is the number of radio terminals 30 connected to the radio base station 20 at the current time t_curr.

・・・数式（６）

... Formula (6)

Alternatively, an approximate curve (linear equation) indicating the relationship between CQI and time may be obtained from the CQI history reported from the wireless terminal 30 using the least square method. Then, using the approximate curve and the number of radio terminals 30 connected to the radio base station 20, an approximate curve (linear equation) indicating the relationship between radio section throughput and time may be obtained. In this case, the basic function unit 201 of the radio base station 20 manages the CQI history reported from the radio terminal 30. Equation (7) is a linear equation related to the wireless interval throughput and time. In Equation (7), MCS () is a function that converts CQI to MCS. CQI _t is an approximate curve (linear equation) indicating the relationship between CQI and time calculated from the CQI history of the wireless terminal 30 using the least square method. In addition, since the calculation method of the approximate curve using the least square method was demonstrated in step S101, description here is abbreviate | omitted.

・・・数式（７）

... Formula (7)

Or you may obtain | require the approximated curve (linear equation) which shows the relationship between RSRQ and time using the least squares method from the log | history of RSRQ reported from the radio | wireless terminal 30. FIG. Then, using the SINR derived from the approximate curve and the number of radio terminals 30 connected to the radio base station 20, an approximate curve (linear equation) indicating the relationship between the radio interval throughput and time may be obtained. SINR is an abbreviation for Signal-to-Interference plus Noise power Ratio. Equation (8) is an equation for deriving SINR from RSRQ. In Equation (8), N _sc ^RB is the number of subcarriers per RB. Equation (9) is a linear equation related to wireless section throughput and time. In Equation (9), CQI () is a function for deriving the maximum CQI that satisfies the target SINR with the SINR. In addition, since the calculation method of the approximate curve using the least square method was demonstrated in step S101, description here is abbreviate | omitted.

・・・数式（８）

... Formula (8)

・・・数式（９）

... Formula (9)

In the above, RSRP may be used instead of RSRQ. In this case, Formula (10) is used to derive SINR from RSRP. In Equation (10), N _ncell is the number of cells adjacent to a cell that is a communication area formed by the radio base station 20. y is an identification number for identifying each of the adjacent cells. Noise is thermal noise. In an environment where the wireless base stations 20 are densely installed such as in urban areas, the thermal noise is negligibly small as compared with RSRP. Therefore, the Noise term can be deleted in Equation (10).

・・・数式（１０）

... Formula (10)

  Or you may obtain | require the approximated curve (linear equation) which shows the relationship between a radio | wireless area throughput and time using Numerical formula (11) instead of Numerical formula (9). In Equation (11), B is a system bandwidth, and is 10 [MHz] in this embodiment.

・・・数式（１１）

... Formula (11)

Alternatively, equation (6), in Equation (7), Equation _(9), using the least squares method also N RB _{/ N UE,} the approximate curve indicating the relationship between the N RB _{/ N UE} and time (linear equation) You may use it. Alternatively, instead of N _RB / N _UE , an approximate curve (linear equation) indicating the relationship between the number of assigned RBs and time is obtained from the history of the number of RBs assigned to the radio terminal 30 using the least square method. May be used.

  Further, the wireless section throughput may be set to 0 during the time when the wireless terminal 30 stays in an area where wireless quality deteriorates, such as a coverage hole. Note that the time spent in the area where the wireless quality deteriorates may be calculated from the current position and the moving speed of the wireless terminal 30. In this case, the radio terminal 30 notifies the radio base station 20 of the moving speed of the radio terminal 30 and the current position of the radio terminal 30. The radio base station 20 uses the map information in the communication area of the radio base station 20 in addition to the current position and the moving speed of the radio terminal 30 notified from the radio terminal 30, and the radio quality included in the map information The time required to pass through the area where the aging deteriorates at the moving speed is calculated. The radio base station 20 acquires and manages map information in advance. Further, the moving speed of the wireless terminal 30 is acquired using a GPS (Global Positioning System), a gyroscope, a three-point positioning, or the like.

  Further, the transmission data amount calculation unit 202 uses the current position of the wireless terminal 30, the moving speed of the wireless terminal 30, and the map information in the communication area of the wireless base station 20, so that the wireless terminal 30 has deteriorated wireless quality. You may calculate the data amount which can be transmitted in the time until it invades into the area. Alternatively, the time until the wireless terminal 30 enters the area where the wireless quality deteriorates is compared with 8 [seconds], which is the time that the user can wait for the display of the Web page, as described above. The amount of data that can be transmitted may be calculated using the value.

  Furthermore, when the radio terminal 30 moves to the radio base station 20 with a high traffic load by handover, the radio section throughput after the handover may be a value close to zero. Note that the physical resource block usage rate (PRB usage) and the number of connected users (Number of active UEs) that can be measured in communication area units may be used as the traffic load of the radio base station 20, and further, as the traffic load, Packet delay or throughput (Scheduled IP Throughput) may be used. Among these, the radio base station 20 acquires the PRB usage from the neighboring radio base stations 20 via the X2 interface between the radio base stations 20. Also, the radio base station 20 acquires information other than the PRB usage via an OAM (Operations And Management) server or by providing a unique interface between the radio base stations 20.

  In the present embodiment, the communication control unit 203 realizes suppression of communication with the radio terminal 30 by not allocating radio resources to the radio terminal 30 having the data amount smaller than the required value. However, suppression of communication may be realized by forcibly disconnecting the wireless link with the wireless terminal 30. Or you may implement | achieve communication suppression by making the allocation parameter | index of the said radio | wireless terminal 30 relatively lower than the allocation parameter | index of the other radio | wireless terminal 30. FIG.

  The above changes can be similarly made in the following embodiments.

[Modification of First Embodiment: One Method Regarding Suppression of Allocation of Radio Resources to Radio Terminal 30]
Next, a modification of the first embodiment of the present invention will be described in detail with reference to the drawings.

  In the present modification, a method for suppressing the allocation of radio resources to the radio terminal 30 when there are a plurality of radio terminals 30 in which the amount of data that can be transmitted before the predetermined time has elapsed is less than a predetermined value will be described.

  FIG. 5 is a flowchart showing an operation procedure for suppressing communication of the wireless terminal 30 when there are a plurality of wireless terminals 30 whose data amount that can be transmitted to the wireless terminal 30 after a predetermined time has elapsed is less than a predetermined value. is there. The radio base station 20 performs the operation illustrated in FIG. 5 after the operation of the transmission data amount calculation unit 202 illustrated in FIG.

  First, the communication control unit 203 uses the mathematical formula (5), and the wireless data in which the amount of data that can be transmitted before a predetermined time elapses is less than the required value from among the wireless terminals 30 whose wireless resource allocation is not suppressed. The presence of the terminal 30 is confirmed (step S301).

  If there is no wireless terminal 30 in which the amount of data that can be transmitted before the predetermined time has elapsed is less than the required value (step S301, NO), the wireless base station 20 ends the process of FIG.

  On the other hand, if there is a wireless terminal 30 in which the amount of data that can be transmitted before the predetermined time has elapsed is less than the required value (step S301, YES), the process proceeds to step S302. That is, the communication control unit 203 uses Equation (12) to find that the amount of data that can be transmitted before a predetermined time elapses from the wireless terminal 30 in which the allocation of the wireless resources is not suppressed to the required value. The small wireless terminal 30 (u) is selected (step S302). The wireless terminal 30 (u) is described as the wireless terminal u in FIG. In Expression (12), i is an identification number of the wireless terminal 30.

・・・数式（１２）

... Formula (12)

  Next, the communication control unit 203 suppresses assignment of radio resources to the radio terminal 30 selected in step S302 (step S303).

Thereafter, the transmission data amount calculation unit 202 recalculates the amount of data D that can be transmitted before a predetermined time elapses with respect to the wireless terminal 30 in which the allocation of the wireless resources is not suppressed using Equation (13) ( Step S304). In Expression (13), it is assumed that the radio resources allocated so far are equally distributed to the other radio terminals 30 to the radio terminals 30 whose allocation of radio resources is suppressed in step S303. Equation (13) indicates that the recalculated value of D is obtained on the left side by performing the calculation of the right side on the current value of D. Equation (14) indicates that the recalculated N _UE value is obtained on the left side by performing the right side operation on the current N _UE value.

・・・数式（１３）

... Formula (13)

Next, the transmission data amount calculation unit 202 updates the N _UE using Equation (14) (step S305).

・・・数式（１４）

... Formula (14)

  Step S301 is performed after the process of step S305 is completed.

  As described above, in the modification of the first embodiment, every time the allocation of radio resources to the radio terminal 30 is suppressed, the data amount D that can be transmitted before a predetermined time elapses is recalculated. At this time, it is assumed that the radio resources allocated to the radio terminal 30 are uniformly distributed to the other radio terminals 30. And in this modification, since it is determined whether or not to suppress the allocation of radio resources based on the recalculation result, the number of radio terminals 30 to suppress the allocation of radio resources is compared with the first embodiment. It can be kept low.

  In step S302, mathematical formula (15) may be used instead of mathematical formula (12). In Equation (15), [u] is a set of wireless terminals 30 with the smallest amount of data that can be transmitted before a predetermined time elapses with respect to the required value. Note that [u] indicates “u character with circumflex (^)” included in Equations (15) to (17).

・・・数式（１５）

... Formula (15)

In this case, in step S304, equation (16) is used instead of equation (13). In step S305, mathematical expression (17) is used instead of mathematical expression (14). In Equations (16) and (17), N _UE ^[u] is the wireless terminal 30 (u) with the smallest amount of data that can be transmitted before a predetermined time elapses with respect to the required value selected in Step S302. Is a number. Expressions (16) and (17) are more general expressions of Expressions (13) and (14). That is, Equations (13) and (14) correspond to the case where N _UE ^[u] = 1 in Equations (16) and (17).

Equation (16) indicates that the recalculated D value is obtained on the left side by performing the right side operation on the current D value. Equation (17) indicates that the recalculated N _UE value is obtained on the left side by performing the right side operation on the current N _UE value.

・・・数式（１６）

... Formula (16)

・・・数式（１７）

... Formula (17)

  In step S302, instead of selecting the wireless terminal 30 with the smallest amount of data that can be transmitted before the predetermined time has passed as the required value as the wireless terminal 30 (u), the capability of the wireless terminal 30 or the wireless The wireless terminal 30 (u) may be selected based on the type of contract applied to the terminal or the charging status of the wireless terminal.

  Modifications including the above-described modifications can be similarly performed in the following embodiments.

[Other Embodiments of the Invention]
[Second Embodiment]
Next, a second embodiment of the present invention will be described in detail with reference to the drawings. This embodiment is different from the first embodiment of the present invention in that a relay device that can acquire the quality requirements of an application in each wireless terminal is newly provided between the server device and the wireless base station.

[Description of configuration]
FIG. 6 shows a configuration example of the communication system 1 according to the second embodiment of the present invention. The communication system 2 newly includes a relay device 40 as compared with the communication system 1 according to the first embodiment. Furthermore, the communication system 2 includes a radio base station 21 instead of the radio base station 20 as compared with the communication system 1 according to the first embodiment. Hereinafter, a configuration changed in the second embodiment as compared with the first embodiment will be described.

  The relay device 40 and the server device 10 are configured to communicate via an external network such as the Internet. The relay device 40 and the radio base station 21 are configured to communicate via the communication line NW. The communication line NW includes an external network such as the Internet and a mobile core network, as in the first embodiment of the present invention.

  For convenience of explanation, in the figure, the communication system 2 includes only one server device 10, one relay device 40, one wireless base station 21, and one wireless terminal 30. However, the number of server apparatuses 10 may be any number, and similarly, the number of relay apparatuses 40, the number of radio base stations 21, and the number of radio terminals 30 may be any number.

  The relay device 40 includes an information processing device (not shown). The information processing apparatus includes a central processing unit (CPU) (not shown) and a storage device (memory and HDD). The relay device 40 may be configured to realize a function to be described later when the CPU executes a program stored in the storage device.

  Similar to the radio base station 20 according to the first embodiment, the radio base station 21 includes an information processing device (not shown). The information processing apparatus includes a central processing unit (CPU) (not shown) and a storage device (memory and HDD). The radio base station 21 may be configured to realize functions to be described later when the CPU executes a program stored in the storage device.

  FIG. 7 is a block diagram showing functions of the communication system 2 configured as described above. Hereinafter, functions added and changed in the second embodiment as compared with the first embodiment will be described.

  The relay device 40 includes a basic function unit 401, an information acquisition unit 402, and an information notification unit 403.

  The basic function unit 401 has a function of transmitting / receiving a signal to / from the server device 10 via an external network such as the Internet, and a function of transmitting / receiving a signal to / from the wireless base station 21 via the communication line NW. The basic function unit 401 further has a function of measuring and managing the communication throughput (communication speed between the relay device 40 and the wireless terminal 30) for each predetermined time between the relay device 40 and the wireless terminal 30.

  The information acquisition unit 402 has a function of acquiring information related to an application in each wireless terminal 30. In the present embodiment, the information related to the application is a request delay for satisfying the QoE of the application and a data amount (file size) necessary for using the application. The information related to the acquired application is used by the information notification unit 403.

  The information notification unit 403 has a function of notifying the wireless base station 21 of information related to the application in each wireless terminal 30 acquired by the information acquisition unit 402 via the basic function unit 401.

  In the present embodiment, the information related to the application in the wireless terminal 30 is notified to the wireless base station 21 by concatenating the information with an IP (Internet Protocol) packet corresponding to the data addressed to the wireless terminal 30. . However, the notification to the radio base station 21 may be performed by adding the information to the header area of the IP packet. Further, this may be performed by concatenating the information with a TCP packet corresponding to the IP packet by TCP (Transmission Control Protocol) used in the lower layer of the IP. The notification to the radio base station 21 may be performed by adding the information to the header area of the TCP packet. Alternatively, the radio base station 21 may be notified by concatenating the information with a UDP packet corresponding to the IP packet by using UDP (User Datagram Protocol) instead of TCP. Further, notification to the radio base station 21 may be performed by adding the information to the header area of the UDP packet. Alternatively, a new interface for notifying the information may be installed between the relay device 40 and the radio base station 21, and the information may be notified to the radio base station 21 via the interface.

  Compared with the radio base station 20 according to the first embodiment of the present invention, the radio base station 21 communicates with a transmission data amount calculation unit 212 in place of the transmission data amount calculation unit 202 and the communication control unit 203. The function of the control unit 213 is provided. Hereinafter, functions of the transmission data amount calculation unit 212 and the communication control unit 213 will be described.

  The transmission data amount calculation unit 212 has a new function of acquiring information related to the application in the wireless terminal 30 notified from the relay device 40. In this embodiment, the transmission data amount calculation unit 212 has a function of DPI (Deep Packet Inspection), and from an IP packet corresponding to data addressed to the wireless terminal 30 transmitted from the relay device 40 to an application in the wireless terminal 30. Acquire such information. At this time, the transmission data amount calculation unit 212 may delete the information from the IP packet after acquiring the information related to the application in the wireless terminal 30.

  In the case where a TCP packet or a UDP packet is used instead of an IP packet in the notification to the radio base station 21 of the information related to the application in the radio terminal 30, the transmission data amount calculation unit 212 is a function of the DPI as described above. May be provided. In this case, the transmission data amount calculation unit 212 acquires information related to the application in the wireless terminal 30 from the TCP packet or UDP packet corresponding to the data addressed to the wireless terminal 30 transmitted from the relay device 40. At this time, the transmission data amount calculation unit 212 may delete the information from the packet after acquiring the information related to the application in the wireless terminal 30.

  When notifying information related to the application in the wireless terminal 30 between the relay device 40 and the wireless base station 21 via a new interface for notifying the information, the transmission data amount calculation unit 212 passes through the interface. To obtain information. In this case, the transmission data amount calculation unit 212 acquires information related to the application in the wireless terminal 30 notified via the interface.

  The transmission data amount calculation unit 212 can transmit data after a predetermined time elapses from the acquired information related to the application in the wireless terminal 30 and the wireless section throughput history of the wireless terminal 30 measured and managed by the basic function unit 201. Has the function of calculating the quantity. The amount of data that can be transmitted before the elapse of a predetermined time is calculated using the future radio section throughput of the radio terminal 30 calculated based on the stochastic spread. In this embodiment, the transmission data amount calculation unit 212 calculates the amount of data that can be transmitted from the communication start time to the wireless terminal 30 until the request delay time for satisfying the QoE of the application in the wireless terminal 30 elapses. . The communication control unit 213 uses the acquired information related to the application in the wireless terminal 30 and the calculated amount of data that can be transmitted before the predetermined time of each wireless terminal 30 elapses.

Similar to the communication control unit 203 according to the first embodiment of the present invention, the communication control unit 213 has a radio resource management function provided in a radio base station in a general radio communication system. Further, the communication control unit 213 uses information related to the application in the wireless terminal 30 and a data amount that can be transmitted until a predetermined time has elapsed, and suppresses communication with the wireless terminal 30 in which the data amount is less than a required value. Have Here, information related to the application in the wireless terminal 30 is acquired by the transmission data amount calculation unit 212. The amount of data that can be transmitted before the predetermined time elapses is calculated by the transmission data amount calculation unit 212. In the present embodiment, the required value is the data amount (file size) necessary for using the application in the wireless terminal 30 acquired by the transmission data amount calculation unit 212. In this embodiment, similarly to the communication control unit 203 according to the first embodiment of the present invention, radio resources are not allocated to the radio terminal 30 in which the amount of data that can be transmitted before the predetermined time has elapsed is less than the required value. As a result, suppression of communication with the wireless terminal 30 is realized. However, suppression of communication may be realized by forcibly disconnecting the wireless link with the wireless terminal 30. Or you may implement | achieve communication suppression by making the allocation parameter | index of the said radio | wireless terminal 30 relatively lower than the allocation parameter | index of the other radio | wireless terminal 30. FIG.
[Description of operation]
Next, an operation procedure in which the radio base station 21 suppresses communication of the radio terminal 30 will be described.

  FIG. 8 shows data that can be transmitted by the transmission data amount calculation unit 212 of the radio base station 21 to the radio terminal 30 that is connected to the radio base station 21 (a communication link is established) before a predetermined time has elapsed. It is a flowchart showing the operation | movement procedure which calculates quantity. The radio base station 21 performs the operation illustrated in FIG. 8 at every predetermined period. In the present embodiment, the radio base station 21 executes the operation of FIG. 8 every 1 [second]. The transmission data amount calculation unit 212 may execute the operation of FIG. 8 with a cycle shorter than 1 [second] or with a cycle longer than 1 [second].

First, the transmission data amount calculation unit 212 uses the wireless section throughput history of the wireless terminal 30 that is measured and managed by the basic function unit 201 of the wireless base station 21, and obtains the stochastic spread regarding the wireless section throughput and time (step S401). ). Equation (18) is a stochastic spread with respect to wireless interval throughput and time. In Equation (18), t _curr is the current time, R _t ⁺ is the best value of the radio interval throughput expected at time t, and R _t ⁻ is the worst value of the radio interval throughput expected at time t. is there. The difference value between R _t ⁺ and R _t ⁻ is the stochastic spread of the radio section throughput of the radio terminal 30 at time t. In Expression (18), μ is a drift coefficient, and in this embodiment, the least square method is used from the wireless section throughput measured by the wireless base station 21 in the period from the current time to a predetermined time before. The slope of the obtained approximate straight line regarding the wireless section throughput and time is used. Also, σ is the variance of the wireless section throughput reported from the wireless terminal 30 during the period from the current time to a predetermined time ago. In addition, α is a constant that determines the prediction range of stochastic diffusion. In this embodiment, α is 2. However, α may be a value smaller than 2 or a value larger than 2.

・・・数式（１８）

... Formula (18)

Next, the transmission data amount calculation unit 212 calculates the amount of data D that can be transmitted to the wireless terminal 30 before the elapse of a predetermined time, using Equation (19) (step S402). Formula (19) is a calculation formula for calculating the amount of data that can be transmitted until a predetermined time has elapsed. In Expression (19), t ₀ (<t _curr ) is a communication start time to the wireless terminal 30, and t _delay is a request delay time for satisfying the QoE of the application in the wireless terminal 30.

・・・数式（１９）

... Formula (19)

  In Equation (19), the amount of data D that can be transmitted to the wireless terminal 30 before the elapse of a predetermined time is calculated using the worst value of wireless section throughput expected at time t.

  The transmission data amount calculation unit 212 performs the above processing for all the wireless terminals 30 connected to the wireless base station 21. Thereafter, the transmission data amount calculation unit 212 ends the process of FIG.

  The communication control unit 213 according to the present embodiment communicates with the wireless terminal 30 in which the amount of data that can be transmitted to the wireless terminal 30 calculated by the transmission data amount calculation unit 212 is less than the required value until a predetermined time has elapsed. The operation procedure to suppress is the same as that of the communication control unit 203 of the first embodiment. The operation procedure of the communication control unit 203 of the radio base station 20 according to the first embodiment is shown in FIG.

  As described above, according to the second embodiment of the present invention, it is possible to predict, for each application, a wireless terminal that cannot complete transmission of data necessary for using the application. For this reason, compared with the first embodiment of the present invention, it is possible to improve the prediction accuracy of a wireless terminal that cannot complete transmission of data necessary for using an application.

  Although the present invention has been described with reference to the above embodiment, the present invention is not limited to the above-described embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

  For example, in the present embodiment, the future wireless section throughput of the wireless terminal 30 calculated based on the stochastic spread from the wireless section throughput history is used to calculate the amount of data that can be transmitted before a predetermined time elapses. However, even in the calculation of the data amount in the first embodiment of the present invention, the future wireless section throughput of the wireless terminal 30 calculated based on the stochastic diffusion from the wireless section throughput history can be similarly used. Further, in the present embodiment, as in the first embodiment of the present invention, the future radio interval throughput of the radio terminal 30 calculated by the least square method from the radio interval throughput history can be used.

  Further, the server device 10 may have the function of the relay device 40 in the present embodiment. In this case, the server apparatus 10 acquires the quality requirement of the application in each wireless terminal 30 and notifies the wireless base station 21 of information related to the quality requirement.

  Further, in the present embodiment, the relay device 40 is disposed in the external network, but may be disposed in the mobile core network (that is, the relay device 40 is configured as a P-GW (PDN disposed in the EPC). (Packet Data Network) -GateWay) or S (Serving) -GW). In this case, in the information notification unit 403 of the relay device 40, the information related to the application in the wireless terminal 30 is notified to the wireless base station 21 by concatenating the information with the packet corresponding to the data addressed to the wireless terminal 30. Done in However, the notification to the radio base station 21 may be performed by adding the information to the header area of the GTP packet. GTP is an abbreviation for GPRS (General Packet Radio Service) Tunneling Protocol. The notification to the radio base station 21 may be performed by concatenating the information with the UDP packet corresponding to the GTP packet in the UDP used in the lower layer of the GTP. The notification to the radio base station 21 may be performed by adding the information to the header area of the UDP packet. The notification to the radio base station 21 may be performed by concatenating the information with the IP packet corresponding to the GTP packet by the IP used in the lower layer of the UDP. The notification to the radio base station 21 may be performed by adding the information to the header area of the IP packet. Alternatively, a new interface for notifying the information may be installed between the relay device 40 and the radio base station 21, and the information may be notified via the interface. Further, in this case, the transmission data amount calculation unit 212 of the radio base station 21 does not require the DPI function, and from various packets corresponding to the data addressed to the radio terminal 30 transmitted from the relay device 40, in the radio terminal 30. Get information about the application.

  Further, a signal related to information relating to an application in the wireless terminal 30 transmitted from the relay device 40 arranged in the external network may be converted in the mobile core network and transferred to the wireless base station 21. For example, consider a case in which information relating to an application in the wireless terminal 30 is notified by being concatenated with an IP packet corresponding to data addressed to the wireless terminal 30. In this case, in the mobile network, the information concatenated to the IP packet may be transferred by concatenation to the GTP packet corresponding to the IP packet and transferred to the radio base station 21. Alternatively, the information may be transferred to the header area of the GTP packet and transferred to the radio base station 21.

  In UDP or IP used in the lower layer of the GTP, the information may be transferred by concatenation to the packet and transferred to the radio base station 21, or the information may be transferred in the header area of the packet. And may be transferred to the radio base station 21. Alternatively, a new interface for notifying the radio base station 21 of the information may be installed in the mobile network, and the information may be transferred to the interface and transferred to the radio base station 21.

  Note that information related to the application in the wireless terminal 30 is transferred from the relay device 40 to the wireless base station 21 by means other than being concatenated with the IP packet corresponding to the data addressed to the wireless terminal 30 described in the present embodiment. The same applies when notified. That is, also in this case, a signal related to the information may be converted in the mobile core network and transferred to the radio base station 21 by the various methods described above. Note that the above conversion can be performed in any node installed in the mobile core network.

  As described above, the relay device 40 according to the present embodiment includes the basic function unit 401, the information acquisition unit 402, and the information notification unit 403. The basic function unit 401 transmits / receives signals to / from the radio base station 21 and the server device 10, and a communication throughput that is a communication speed per predetermined time between the radio terminal 30 and the relay device 40 that performs radio communication with the radio base station 21. Measure and manage. The information acquisition unit 402 acquires information related to the application in the wireless terminal 30. The information notification unit 403 notifies the wireless base station 21 of information related to the application in the wireless terminal 30 acquired by the information acquisition unit 402 via the basic function unit 401.

  When the server device 10 has the function of the relay device 40, the server device 10 further includes a configuration similar to that of the relay device 40 of FIG. That is, the server device 10 includes a basic function unit 401, an information acquisition unit 402, and an information notification unit 403. When the server device 10 is provided with the basic function unit 401, the basic function unit 401 measures and manages a communication throughput that is a communication speed per predetermined time between the wireless terminal that performs wireless communication with the wireless base station and the server device 10. . Similarly to the relay device 40, the information acquisition unit 402 and the information notification unit 403 included in the server device 10 acquire information related to the application in the wireless terminal 30, and the basic function unit 401 included in the server device 10 includes the acquired information. Via the wireless base station 21.

  That is, both the relay device 40 and the server device 10 having the functions of the relay device 40 notify the radio base station 21 of information related to the application in the radio terminal 30 in the communication system 2 described in FIG. . As a result, it is possible to improve QoE of a wireless terminal that can be expected to complete transmission of necessary data. Also in this embodiment, a modification of the first embodiment of the present invention can be implemented.

  Modifications including the above-described modifications can be similarly performed in the following embodiments.

[Third Embodiment: Implementation of communication suppression by relay device]
Next, a third embodiment of the present invention will be described in detail with reference to the drawings. This embodiment is different from the second embodiment of the present invention in that the relay device has a function of suppressing communication with a wireless terminal.
[Description of configuration]
FIG. 9 shows a configuration example of the communication system 3 according to the third embodiment of the present invention. The communication system 3 includes a relay device 41 and a radio base station 22 instead of the relay device 40 and the radio base station 21 as compared to the communication system 2 according to the second embodiment of the present invention. Hereinafter, a configuration changed in the third embodiment as compared with the second embodiment will be described.

  The relay device 41 includes an information processing device (not shown) as in the relay device 40 according to the second embodiment of the present invention. The information processing apparatus includes a central processing unit (CPU) (not shown) and a storage device (memory and HDD). The relay device 41 may be configured to realize a function to be described later when the CPU executes a program stored in the storage device.

  Similar to the radio base station 21 according to the second embodiment of the present invention, the radio base station 22 includes an information processing device (not shown). The information processing apparatus includes a central processing unit (CPU) (not shown) and a storage device (memory and hard disk device (HDD)). The radio base station 22 may be configured to realize functions to be described later when the CPU executes a program stored in the storage device.

  FIG. 10 is a block diagram showing functions of the communication system 3 configured as described above. Hereinafter, functions added and changed in the third embodiment will be described in comparison with the second embodiment.

  The radio base station 22 includes a communication control unit 223 instead of the communication control unit 213 as compared with the radio base station 21 according to the second embodiment of the present invention. Hereinafter, functions of the communication control unit 223 will be described.

  Similar to the communication control unit 213 according to the second embodiment of the present invention, the communication control unit 223 has a radio resource management function provided in a radio base station in a general radio communication system. Further, the communication control unit 223 uses the information related to the application in the wireless terminal 30 and the amount of data that can be transmitted before a predetermined time elapses, and the information related to the wireless terminal 30 in which the data amount is less than the required value is relayed to the relay device 41 is newly provided. Here, information related to the application in the wireless terminal 30 is acquired by the transmission data amount calculation unit 212. The amount of data that can be transmitted before the predetermined time elapses is calculated by the transmission data amount calculation unit 212. In the present embodiment, the required value is the amount of data (file size) necessary for using the application in the wireless terminal 30, as with the communication control unit 213 according to the second embodiment of the present invention.

  In the present embodiment, the communication control unit 223 has a DPI function, and the notification to the relay device 41 of the information related to the wireless terminal 30 is performed by sending information related to the wireless terminal 30 to the IP packet corresponding to the data addressed to the wireless terminal 30. It is done by concatenating. However, the information related to the wireless terminal 30 may be notified to the relay device 41 by adding the information to the header area of the IP packet. Notification may be performed by concatenating the information with a TCP packet corresponding to the IP packet in the TCP used in the lower layer of the IP. The notification may be performed by adding the information to the header area of the TCP packet. Alternatively, the notification may be performed by concatenating the information with a UDP packet corresponding to the IP packet not by TCP but by UDP. The notification may be performed by adding the information to the header area of the UDP packet. Alternatively, a new interface for notifying the information may be installed between the relay device 41 and the radio base station 22, and the information related to the radio terminal 30 may be notified via the interface.

  The relay device 41 is newly provided with the function of the communication control unit 414 as compared with the relay device 40 according to the second embodiment of the present invention. Hereinafter, functions of the communication control unit 414 will be described.

  The communication control unit 414 has a function of acquiring information regarding the wireless terminal 30 notified from the wireless base station 22. In the present embodiment, information regarding the wireless terminal 30 is acquired from the IP packet corresponding to the data addressed to the wireless terminal 30 transmitted from the wireless base station 22. At this time, the communication control unit 414 may delete the information from the IP packet after acquiring the information related to the wireless terminal 30. Note that, in the case where a TCP packet or a UDP packet is used instead of an IP packet in the notification of the information related to the wireless terminal 30 to the relay device 41, the communication control unit 414 similarly acquires the information related to the wireless terminal 30. The information may be deleted from the packet.

  When a new interface for notifying the information is installed between the radio base station 22 and the relay device 41 and the information related to the radio terminal 30 is notified via the interface, the communication control unit 414 The following functions are provided. That is, the communication control unit 414 has a function of acquiring information via the interface, and acquires information related to the wireless terminal 30 notified via the interface.

Further, the communication control unit 414 has a function of suppressing communication with the wireless terminal 30 notified from the wireless base station 22. In the present embodiment, the communication control unit 414 forcibly terminates the session between the wireless terminal 30 and the server device 10. However, the communication control unit 414 may stop the transmission of traffic addressed to the wireless terminal 30 or reduce the transmission rate to the wireless terminal 30.
[Description of operation]
The operation procedure of the communication control unit 223 is the first embodiment described in FIG. 4 except that the relay device 41 is notified of information related to the wireless terminal 30 instead of suppressing the allocation of the wireless resources to the wireless terminal 30. The operation procedure of the communication control unit 223 of the radio base station 20 according to FIG.

  The communication control unit 414 suppresses communication with the wireless terminal 30 immediately after acquiring information related to the wireless terminal 30 from the wireless base station 22.

  Although the present invention has been described with reference to the above embodiment, the present invention is not limited to the above-described embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

  For example, the server device 10 may have the function of the relay device 41 in the present embodiment. In this case, the server device 10 acquires the quality requirement of the application in each wireless terminal 30 and notifies the wireless base station 22 of information related to the quality requirement. Then, the server device 10 acquires information related to the wireless terminal 30 notified from the wireless base station 22 and suppresses communication with the wireless terminal 30. Further, when the server device 10 suppresses communication with the wireless terminals 30, the function of acquiring the quality requirements of the application in each wireless terminal 30 and notifying the wireless base station 22 of information related to the quality requirements may be omitted. . In this case, similarly to the first embodiment of the present invention, the transmission data amount calculation unit 212 of the radio base station 22 calculates the amount of data that can be transmitted before a predetermined time elapses. The communication control unit 223 suppresses communication with the wireless terminal 30 in which the data amount calculated by the transmission data amount calculation unit 212 is smaller than a preset required value.

  Moreover, the relay apparatus 41 can also be arrange | positioned in a mobile core network similarly to the 2nd Embodiment of this invention. In this case, the communication control unit 223 of the radio base station 22 notifies the relay device 41 of information related to the radio terminal 30 by concatenating the information with a GTP packet corresponding to data addressed to the radio terminal 30. Done. However, notification of the information related to the wireless terminal 30 to the relay device 41 may be performed by adding the information to the header area of the GTP packet. The notification of the information may be performed by concatenating the information with the UDP packet corresponding to the GTP packet in the UDP used in the lower layer of the GTP. The notification of the information may be performed by adding the information to the header area of the UDP packet. The notification of the information may be performed by concatenating the information with an IP packet corresponding to the GTP packet with an IP used in a lower layer of the UDP. The notification of the information may be performed by adding the information to the header area of the IP packet. Alternatively, a new interface for notifying the information may be installed between the radio base station 22 and the relay device 41, and the information may be notified via the interface. In this case, the communication control unit 223 of the radio base station 22 can notify the relay device 41 of information related to the radio terminal 30 without requiring the DPI function. In this case, the communication control unit 414 of the relay device 41 acquires information related to the wireless terminal 30 from various packets corresponding to the data addressed to the wireless terminal 30 transmitted from the wireless base station 22.

  As in the second embodiment, the signal related to the information related to the application in the wireless terminal 30 transmitted from the relay device 41 arranged in the external network may be converted in the mobile core network and transferred to the wireless base station 22. Good.

  Further, a signal related to information on the radio terminal 30 transmitted from the radio base station 22 to the relay device 41 arranged in the external network may be converted in the mobile core network and transferred to the relay device 41. For example, when information related to the wireless terminal 30 is notified by being concatenated with a GTP packet corresponding to data addressed to the wireless terminal 30, the following operation is performed. That is, in the mobile network, the information related to the application in the wireless terminal 30 concatenated with the GTP packet is transferred by concatenation to the upper layer IP packet corresponding to the GTP packet and transferred to the relay device 41. May be. Alternatively, the information may be transferred to the header area of the IP packet and transferred to the relay device 41. Further, the information may be transcribed and transferred to the relay device 41 by concatenation with the packet in UDP or TCP used in the upper layer of the IP. Alternatively, the information may be transferred to the header area of the packet and transferred to the relay device 41. Alternatively, a new interface for notifying the relay apparatus 41 of the information may be installed in the mobile network, and the information may be transferred to the relay apparatus 41 via the interface. Information related to the wireless terminal 30 is notified from the wireless base station 22 to the relay apparatus 41 by means other than concatenation with the IP packet corresponding to the data addressed to the wireless terminal 30 described in the present embodiment. The same applies to the case. That is, the signal related to the information may be converted in the mobile core network and transferred to the relay device 41 by the various methods described above. In addition, it is assumed that the conversion can be performed in any node installed in the mobile core network.

  Also in this embodiment, a modification of the first embodiment of the present invention can be implemented.

  Modifications including the above-described modifications can be similarly performed in the following embodiments.

[Fourth embodiment: The amount of data that can be transmitted is calculated by the relay device]
Next, a fourth embodiment of the present invention will be described in detail with reference to the drawings. This embodiment is different from the third embodiment of the present invention in that the relay device has a function of calculating the amount of data that can be transmitted to the wireless terminal 30 before a predetermined time has elapsed.
[Description of configuration]
FIG. 11 shows a configuration example of the communication system 4 according to the fourth embodiment of the present invention. The communication system 4 includes a relay device 42 and a radio base station 23 instead of the relay device 41 and the radio base station 22 as compared with the communication system 3 according to the third embodiment of the present invention. Hereinafter, a configuration changed in the fourth embodiment as compared with the third embodiment will be described.

  The relay device 42 includes an information processing device (not shown) as in the relay device 41 according to the third embodiment of the present invention. The information processing apparatus includes a central processing unit (CPU) (not shown) and a storage device (a memory and a hard disk device (HDD)). The relay device 42 is configured to realize functions to be described later when the CPU executes a program stored in the storage device.

  Similar to the radio base station 22 according to the third embodiment of the present invention, the radio base station 23 includes an information processing device (not shown). The information processing apparatus includes a central processing unit (CPU) (not shown) and a storage device (a memory and a hard disk device (HDD)). The radio base station 23 is configured to realize functions to be described later when the CPU executes a program stored in the storage device.

  FIG. 12 is a block diagram showing functions of the communication system 3 configured as described above. In the following, functions added and changed in the fourth embodiment will be described as compared with the third embodiment.

  The radio base station 23 includes only the basic function unit 201. The relay device 42 omits the function of the information notification unit 403 as compared with the relay device 41 according to the third embodiment of the present invention. Furthermore, the relay device 42 is newly provided with the function of the transmission data amount calculation unit 425, compared to the relay device 41 according to the third embodiment of the present invention. Further, the relay device 42 includes a function of a communication control unit 424 instead of the communication control unit 414, as compared with the relay device 41 according to the third embodiment of the present invention. Hereinafter, functions of the transmission data amount calculation unit 425 and the communication control unit 424 will be described.

  The transmission data amount calculation unit 425 uses the information related to the application in the wireless terminal 30 and the communication throughput between the future relay device 42 and the wireless terminal 30 to transmit the amount of data that can be transmitted after a predetermined time has elapsed. It has a function to calculate Information related to the application in the wireless terminal 30 is acquired by the information acquisition unit 402. The communication throughput between the future relay device 42 and the wireless terminal 30 is calculated based on the probability spread from the communication throughput history between the relay device 42 and the wireless terminal 30 measured and managed by the basic function unit 401. . In this embodiment, the transmission data amount calculation unit 425 calculates the amount of data that can be transmitted from the communication start time to the wireless terminal 30 until the request delay time for satisfying the QoE of the application in the wireless terminal 30 elapses. . The calculated amount of data that can be transmitted before the elapse of a predetermined time of each wireless terminal 30 is used by the communication control unit 424.

The communication control unit 424 uses the information related to the application in the wireless terminal 30 and the data amount that can be transmitted before the predetermined time calculated by the transmission data amount calculation unit 425, and the data amount is less than the required value. A function of suppressing communication with the terminal 30 is provided. In the present embodiment, the required value is a data amount (file size) necessary for using an application in the wireless terminal 30. In the present embodiment, the communication between the wireless terminal 30 is suppressed by forcibly terminating the session between the wireless terminal 30 and the server device 10. However, the transmission of traffic addressed to the wireless terminal 30 may be stopped, or the transmission rate to the wireless terminal 30 may be lowered.
[Description of operation]
The operation procedure of the transmission data amount calculation unit 425 is the radio base station according to the second embodiment described in FIG. 8 except that the throughput with the relay device 42 of the radio terminal 30 is used instead of the radio section throughput. The operation procedure of the transmission data amount calculation unit 212 of the station 21 is the same.

  The operation procedure of the communication control unit 424 is the first embodiment described in FIG. 4 except that the session between the wireless terminal 30 and the server device 10 is forcibly terminated instead of suppressing the assignment of the wireless resources. The operation procedure of the communication control unit 203 of the radio base station 20 according to FIG.

  Although the present invention has been described with reference to the above embodiment, the present invention is not limited to the above-described embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

  For example, in the present embodiment, the future amount of the wireless terminal 30 calculated based on the stochastic spread from the communication throughput history between the relay device 42 and the wireless terminal 30 is calculated for calculating the amount of data that can be transmitted before a predetermined time has elapsed. The communication throughput between the relay device 42 and the wireless terminal 30 was used. However, as in the first embodiment, the communication between the future relay device 42 of the wireless terminal 30 and the wireless terminal 30 calculated by the least square method from the communication throughput history between the relay device 42 and the wireless terminal 30. Throughput may be used.

  Further, the relay device 42 may omit the function of the information acquisition unit 402. In this case, similarly to the first embodiment, the transmission data amount calculation unit 425 of the relay device 42 calculates the amount of data that can be transmitted before a predetermined time elapses, and the communication control unit 424 of the relay device 42 Then, communication with the wireless terminal 30 in which the data amount calculated by the transmission data amount calculation unit 425 is less than a preset required value is suppressed.

  Furthermore, for example, the server device 10 may have the function of the relay device 42 in the present embodiment. In this case, the server device 10 acquires the quality requirements of the application in each wireless terminal 30, and the amount of data that can be transmitted is determined from the required value set in advance by the functions of the transmission data amount calculation unit 425 and the communication control unit 424 described above. Communication with respect to a small number of wireless terminals 30 is suppressed.

  Also in this embodiment, a modification of the first embodiment of the present invention can be implemented.

  Modifications including the above-described modifications can be similarly performed in the following embodiments.

[Fifth embodiment: priority control]
Next, a fifth embodiment of the present invention will be described in detail with reference to the drawings. In the present embodiment, the wireless base station is newly provided with a function that prioritizes the allocation of radio resources for radio terminals that can be expected to complete transmission of data required by preferentially allocating radio resources. Different from the first embodiment of the present invention.
[Description of configuration]
FIG. 13 shows a configuration example of a communication system 5 according to the fifth embodiment of the present invention. The communication system 5 includes a radio base station 24 instead of the radio base station 20 as compared with the communication system 1 according to the first embodiment of the present invention. Below, the structure changed in 5th Embodiment compared with 1st Embodiment is demonstrated.

  Similarly to the radio base station 20 according to the first embodiment of the present invention, the radio base station 24 includes an information processing device (not shown). The information processing apparatus includes a central processing unit (CPU) (not shown) and a storage device (a memory and a hard disk device (HDD)). The radio base station 24 is configured to realize functions to be described later when the CPU executes a program stored in the storage device.

  FIG. 14 is a block diagram showing functions of the radio base station 24 in the communication system 5 configured as described above.

  Compared with the radio base station 20 according to the first embodiment of the present invention, the radio base station 24 is newly provided with the function of the usable bandwidth estimation unit 244. Further, the radio base station 24 is different from the radio base station 20 according to the first embodiment of the present invention in that a transmission data amount calculation unit 202 and a transmission data amount calculation unit 242 instead of the communication control unit 203 The function of the communication control unit 243 is provided. Hereinafter, functions of the available bandwidth estimation unit 244, the transmission data amount calculation unit 242, and the communication control unit 243 will be described.

  The available bandwidth estimation unit 244 sets, for each wireless terminal, the number of requested RBs, which is the number of RBs (Resource Blocks) per TTI required to transmit the amount of data required in the wireless terminal within a predetermined time. To do. When the set number of requested RBs is assigned to each wireless terminal, a wireless band that is not assigned to any wireless terminal 30 is estimated as an available band. The estimated available bandwidth is used by the transmission data amount calculation unit 242.

  The transmission data amount calculation unit 242 has a function of calculating the amount of data that can be transmitted before a predetermined time elapses, using the future wireless section throughput of the wireless terminal 30. As in the case of the transmission data amount calculation unit 202 in the first embodiment, the future wireless interval throughput of the wireless terminal 30 is determined by the least square method from the wireless interval throughput history of the wireless terminal 30 measured and managed by the basic function unit 201. Is calculated. Further, the transmission data amount calculation unit 242 transmits the amount of data that can be transmitted before a predetermined time elapses to the wireless terminal 30 in which the amount of data that can be transmitted selected by the communication control unit 243 described later is smaller than the required value. Has a new function to recalculate In this recalculation, the future of the wireless terminal 30 calculated by the least square method from the available bandwidth estimated by the available bandwidth estimation unit 244 and the wireless section throughput history of the wireless terminal 30 measured and managed by the basic function unit 201 is used. Radio interval throughput is used. The amount of data that can be transmitted before a predetermined time has elapsed for each wireless terminal 30 calculated by the transmission data amount calculation unit 242 is used by the communication control unit 243.

  Similar to the communication control unit 203 in the first embodiment of the present invention, the communication control unit 243 has a radio resource management function provided in a radio base station in a general radio communication system. Further, like the communication control unit 213 in the second embodiment of the present invention, the communication control unit 243 uses the amount of data that can be transmitted before the lapse of a predetermined time calculated by the transmission data amount calculation unit 242, and uses the data amount. Has a function of selecting a wireless terminal 30 that is less than the required value. Further, the communication control unit 243 uses the data amount that can be transmitted to the wireless terminal 30 whose data amount is less than the required value until the predetermined time elapsed by the transmission data amount calculation unit 242 re-calculates. Has a function of suppressing communication with the wireless terminal 30 that is less than the required value. In addition, the communication control unit 243 has a function of giving priority to communication with the wireless terminal 30 in which the data amount is equal to or greater than a required value.

In the present embodiment, by suppressing the allocation of radio resources to the radio terminal 30 in which the amount of data that can be transmitted before the predetermined time has elapsed is less than the required value, communication with the radio terminal 30 is suppressed. However, suppression of communication may be realized by forcibly disconnecting the wireless link with the wireless terminal 30. Or you may implement | achieve communication suppression by making the allocation parameter | index of the said radio | wireless terminal 30 relatively lower than the allocation parameter | index of the other radio | wireless terminal 30. FIG. Further, in this embodiment, the priority of communication with respect to the wireless terminal 30 is realized by increasing the allocation index for the wireless terminal 30 in which the data amount is equal to or greater than the required value. The communication priority may be realized by implementing the above. Alternatively, priority of communication may be realized by setting a large transmission power during data communication with respect to the wireless terminal 30. Alternatively, in a cell adjacent to the cell with which the wireless terminal 30 is communicating, the transmission power for the same wireless band as that used by the wireless terminal 30 is reduced so that the interference power for the wireless terminal 30 is reduced. Communication priority may be realized by setting.
[Description of operation]
Next, an operation procedure of whether the radio base station 24 suppresses or gives priority to the communication of the radio terminal 30 will be described.

  FIG. 15 is a flowchart illustrating an operation procedure for suppressing or giving priority to the allocation of radio resources to the radio terminal 30. The radio base station 24 performs the operation illustrated in FIG. 15 after the operation of the transmission data amount calculation unit 242 illustrated in FIG.

First, the communication control unit 243 determines whether or not the data amount D that can be transmitted to the wireless terminal 30 calculated by the transmission data amount calculation unit 242 by using Equation (5) before the predetermined time has elapsed is less than the required value. Is determined (step S501). In Expression (5), D _thresh is a required value. In this embodiment, for convenience of explanation, the average size of a Web page in 2015 is 2 [MByte], but a value smaller than 2 [MByte]. Also, it may be a value larger than 2 [MByte].

  When Expression (5) is satisfied (step S501, YES), the communication control unit 243 determines that the wireless terminal 30 is a wireless terminal that cannot complete transmission of data necessary for using the application due to deterioration in wireless channel quality.

Next, when the transmission data amount calculation unit 242 additionally assigns the available bandwidth estimated by the available bandwidth estimation unit 244 to the wireless terminal 30 selected in step S501 using Equation (20), a predetermined time The amount of data D that can be transmitted before the elapse of time is recalculated (step S502). In Equation (20), N _{i, reqRB} is the number of RBs requested by the wireless terminal 30 and is calculated using Equation (21). In Equation (21), aveN _{i, allocRB} is the average number of assigned RBs of the wireless terminal 30 with the identification number i. N _{i, reqRB} indicates the amount of data D _thresh [bit] to be transmitted before the elapse of a predetermined time, the requested delay time t _delay [sec] of the wireless terminal 30, and the wireless section throughput R t _curr / aveN _i, It is derived by dividing by the product of _allocRB [bps / RB].

・・・数式（２０）

... Formula (20)

・・・数式（２１）

... Formula (21)

  Next, the communication control unit 243 uses Formula (5) again, and the data amount D that can be transmitted to the wireless terminal 30 recalculated by the transmission data amount calculation unit 242 before the predetermined time elapses is less than the required value. It is determined whether or not (step S503).

  When Expression (5) is satisfied (step S503, YES), the communication control unit 243 determines that the wireless terminal 30 is a wireless terminal that cannot complete transmission of data necessary for using the application due to deterioration in wireless channel quality. Then, the communication control unit 243 determines not to allocate radio resources to the radio terminal 30 (step S504). On the other hand, when Expression (5) is not satisfied (NO in step S503), the communication control unit 243 is a wireless terminal that can complete the transmission of data necessary for using the application by additionally assigning the available bandwidth to the wireless terminal 30. to decide. Then, the communication control unit 243 determines to prioritize allocation of radio resources to the radio terminal 30 (Step S505). Thereafter, the radio base station 24 ends the process of FIG.

  In step S501, when the mathematical formula (5) is not satisfied (step S501, NO), the radio base station 24 ends the process of FIG.

  As described above, according to the fifth embodiment, it is possible to prioritize the allocation of radio resources to radio terminals that can expect the completion of transmission of required data by the priority allocation of radio resources. As a result, compared with the first embodiment, it is possible to reduce the proportion of wireless terminals that cannot complete transmission of required data.

  Although the present invention has been described with reference to the above embodiment, the present invention is not limited to the above-described embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

  For example, in the present embodiment, the future wireless section throughput of the wireless terminal 30 calculated by the least square method from the wireless section throughput history is used to calculate the amount of data that can be transmitted before a predetermined time elapses. However, as in the second embodiment, the future wireless section throughput of the wireless terminal 30 calculated based on the stochastic spread from the wireless section throughput history may be used.

  In addition, when priority is given to communication with the radio terminal 30 when the transmission power during data communication with the radio terminal 30 is increased or when the interference power with respect to the radio terminal 30 is reduced, the radio channel quality of the radio terminal 30 is improved. The amount of data D that can be transmitted before a lapse of a predetermined time may be recalculated in consideration of the amount.

  Further, as in the second embodiment of the present invention, a relay device for control that can acquire the quality requirements of the application in each wireless terminal may be provided between the server device and the wireless base station. In this case, similarly to the transmission data amount calculation unit 212 in the second embodiment of the present invention, the transmission data amount calculation unit 242 of the radio base station 24 acquires information related to the application in the radio terminal 30 notified from the relay device. It has a function to do. Further, the transmission data amount calculation unit 242 of the wireless base station 24 also uses the acquired information related to the application in the wireless terminal 30 to calculate the amount of data that can be transmitted before a predetermined time has elapsed. Further, the recalculation of the data amount using the available bandwidth estimated by the available bandwidth estimation unit 244 is also performed using the information.

  Also in this embodiment, a modification of the first embodiment of the present invention can be implemented.

[Other embodiments]
The above-described embodiments may be implemented independently or may be implemented in combination as appropriate.

  The above-described embodiment may be implemented in the following modifications. For example, the radio terminal 30 provides information related to the application from the application layer to the lower RRC layer. The RRC layer processing unit of the radio terminal 30 generates information related to the application provided from the upper application layer (that is, information for calculating the amount of data that can be transmitted) as an RRC message (for example, RRC Connection Setup Complete, RRC Connection Reconfiguration Complete, Measurement Report). At this time, the information related to the application is transmitted in the same RRC message together with information (for example, RSRP, RSRQ) for calculating the wireless section throughput (that is, the amount of data that can be transmitted before a predetermined time elapses). Or may be transmitted separately. The radio base station 20 that has received this RRC message may perform the above-described operation of the communication control unit based on the information related to the application included in the RRC message and the information for calculating the radio section throughput. .

  In addition, or instead of this, the above-described embodiment may be applied to a configuration including MEC (Mobile Edge Computing) arranged in or near the radio base station 20. That is, the operation of the above-described embodiment may be performed in a communication system including the MEC server as the server device 10 in the above-described embodiment, the wireless terminal 30, the wireless base station 20, and the relay device 40. In this case, the relay device 40 is not an essential component. Alternatively, the relay device 40 may be virtually installed in the MEC server.

  Additionally or alternatively, the above-described embodiment may be applied to a configuration including a DC (Data Center) including the function of the radio base station 20 and the function of the mobile core network. That is, the operation of the above-described embodiment may be performed in a communication system including the DC as the wireless base station 20 in the above-described embodiment, the server device 10, the wireless terminal 30, and the relay device 40. The DC may be a core DC or a distributed DC. In this case, the relay device 40 is not an essential component. Alternatively, the relay device 40 may be virtually mounted on the DC.

  The configuration including the transmission data amount calculation unit 202 and the communication control unit 203 described in the first embodiment can be referred to as a communication device. That is, the communication device includes a transmission data amount calculation unit and a communication control unit. The communication control means calculates the amount of data that can be transmitted to the wireless terminal during a predetermined period. The communication control means compares the required value, which is the amount of data required at the wireless terminal, with the transmittable data amount, and if the transmittable data amount is less than the calculated required value, the communication control means Suppress communication. As a result, the communication device including the transmission data amount calculation unit and the communication control unit can improve the QoE of the wireless terminal. Moreover, such a communication apparatus may be provided not only in the radio base station but also in the relay apparatus or the server apparatus as described in the fourth embodiment.

  The embodiment of the present invention can be described as the following supplementary notes. However, the contents of the supplementary notes are not limited to the following. Various modifications that can be understood by those skilled in the art can be made to the embodiments of the present invention described in the supplementary notes.

(Appendix 1)
A transmission data amount calculating means for calculating a data amount that can be transmitted to the wireless terminal during a predetermined period;
The required value, which is the amount of data required in the wireless terminal, is compared with the transmittable data amount, and if the transmittable data amount is less than the required value, communication with the wireless terminal is suppressed. Communication control means;
A communication device comprising:

(Appendix 2)
The communication apparatus according to appendix 1, wherein the communication control unit suppresses communication with the wireless terminal only by performing communication with the wireless terminal for which the transmittable data amount is equal to or greater than the required value.

(Appendix 3)
The communication control means includes
Selecting one or more wireless terminals from among the wireless terminals whose transmittable data amount is less than the required value;
Suppress communication to the selected wireless terminal;
The transmission data amount calculation means includes:
Each time communication to the wireless terminal is suppressed, the amount of data that can be transmitted is recalculated,
The communication control means includes
After the recalculation, the selection of the wireless terminal and the suppression of the communication are performed again.
The communication apparatus described in appendix 1.

(Appendix 4)
The transmission data amount calculation means includes:
Based on one of the difference or ratio of the transmittable data amount with respect to the required value, the capability of the wireless terminal, the type of contract applied to the wireless terminal, and the charging status of the wireless terminal Select a wireless device,
The communication apparatus described in appendix 3.

(Appendix 5)
The communication apparatus according to any one of appendices 1 to 4, wherein the transmission data amount calculation unit calculates the transmittable data amount based on a throughput history with the wireless terminal.

(Appendix 6)
The transmission data amount calculation means calculates the predetermined period,
Request delay of application in the wireless terminal, and
Time until the wireless terminal enters an area where wireless quality of wireless communication deteriorates,
The communication device according to any one of appendices 1 to 5, which calculates based on any one of the above.

(Appendix 7)
The required value is
The amount of data required to use the application in the wireless terminal, and
The amount of data used by the application in the wireless terminal within the stay time of the wireless terminal in an area where the wireless quality of wireless communication deteriorates,
The communication apparatus according to any one of appendices 1 to 6, which is any one of the above.

(Appendix 8)
The communication apparatus according to appendix 7, wherein the transmission data amount calculation unit calculates the predetermined period and the required value based on information relating to an application in the wireless terminal.

(Appendix 9)
The communication apparatus according to appendix 8, wherein the information related to the application includes a request delay of the application and a file size necessary for using the application.

(Appendix 10)
The communication apparatus according to any one of appendices 6 to 9, wherein the application in the wireless terminal is an application program that is executed in the wireless terminal and affects QoE (Quality of Experience).

(Appendix 11)
A base station apparatus comprising the communication apparatus according to any one of appendices 1 to 10.

(Appendix 12)
The communication control unit is configured to suppress communication with the wireless terminal by not allocating radio resources to the wireless terminal that is a target of communication suppression, and wireless communication with the wireless terminal that is a target of communication suppression. The base described in appendix 11, which is realized by either setting an assignment index of the wireless terminal to be subject to forced link disconnection or communication suppression relatively lower than an assignment index of another wireless terminal Station equipment.

(Appendix 13)
Further comprising: an available bandwidth estimating means for estimating an available bandwidth that is a bandwidth that can be used in the wireless terminal for which the transmittable data amount is less than the required value with respect to the wireless bandwidth of the base station device;
The transmission data amount calculation means calculates the transmittable data amount based on the available bandwidth.
The base station apparatus described in appendix 12.

(Appendix 14)
The base station apparatus according to appendix 13, wherein the communication control unit prioritizes communication with the wireless terminal for which the transmittable data amount calculated based on the available bandwidth is equal to or greater than the required value.

(Appendix 15)
A relay device comprising the communication device according to any one of appendices 1 to 10.

(Appendix 16)
The communication control means suppresses communication with the wireless terminal, forcibly terminates a session with the wireless terminal that is subject to communication suppression, stops transmission to the wireless terminal, and transmits to the wireless terminal. The relay device according to attachment 15, which is realized by any of the rate reductions.

(Appendix 17)
A server device comprising the communication device according to any one of appendices 1 to 10.

(Appendix 18)
The communication control means suppresses communication with the wireless terminal, forcibly terminates a session with the wireless terminal that is subject to communication suppression, stops transmission to the wireless terminal, and transmits to the wireless terminal. The server apparatus according to appendix 17, which is realized by any of the rate reductions.

(Appendix 19)
A transmission data amount calculation means for calculating a data amount that can be transmitted to the wireless terminal during a predetermined period, and a required value that is a data amount required in the wireless terminal is compared with the transmittable data amount. A base station apparatus comprising: first communication control means for notifying outside of information related to the wireless terminal whose transmittable data amount is less than the required value; and
A relay device comprising second communication control means for suppressing communication with the wireless terminal to which information related to the wireless terminal has been notified;
A communication system comprising:

(Appendix 20)
A base station apparatus according to any one of appendices 11 to 14,
A server device that provides a communication service to a terminal that performs wireless communication with the base station device;
A communication system comprising:

(Appendix 21)
A base station device;
A server device that provides a communication service to a terminal that performs wireless communication with the base station device;
Relay device described in appendix 15 or 16 that relays communication between the base station device and the server device;
A communication system comprising:

(Appendix 22)
A base station device;
The server device according to appendix 17 or 18, which provides a communication service to a terminal that performs wireless communication with the base station device;
A relay device that relays communication between the base station device and the server device;
A communication system comprising:

(Appendix 23)
Calculate the amount of data that can be transmitted to the wireless terminal during a given period,
Compare the required value, which is the amount of data required in the wireless terminal, with the amount of data that can be transmitted,
If the amount of data that can be transmitted is less than the required value, suppress communication with the wireless terminal,
A method for controlling a communication device.

(Appendix 24)
The communication apparatus control method according to appendix 23, wherein the suppression of communication with the wireless terminal includes causing the wireless terminal to perform the communication only when the transmittable data amount is equal to or greater than the required value.

(Appendix 25)
The suppression of the communication is
Selecting one or more wireless terminals from among the wireless terminals whose transmittable data amount is less than the required value;
Suppress communication with the selected wireless terminal;
Including
The calculation of the amount of data that can be transmitted is as follows:
Each time the communication to the wireless terminal is suppressed in the suppression of the communication, the amount of data that can be transmitted is recalculated,
After the recalculation, the selection of the wireless terminal and the suppression of the communication are performed again.
The control method of the communication apparatus as described in attachment 23 including this.

(Appendix 26)
The selection of the wireless terminal is as follows:
Based on one of the difference or ratio of the transmittable data amount with respect to the required value, the capability of the wireless terminal, the type of contract applied to the wireless terminal, and the charging status of the wireless terminal Select a wireless device,
The control method of the communication apparatus described in appendix 25.

(Appendix 27)
27. The communication device control method according to any one of appendices 23 to 26, wherein the transmittable data amount is calculated based on a throughput history of the wireless terminal.

(Appendix 28)
The predetermined period is
Request delay of application in the wireless terminal, and
Time until the wireless terminal enters an area where wireless quality of wireless communication deteriorates,
The communication device control method according to any one of appendices 23 to 27, which is calculated based on any one of the above.

(Appendix 29)
The required value is
The amount of data required to use the application in the wireless terminal, and
The amount of data used by the application in the wireless terminal within the stay time of the wireless terminal in an area where the wireless quality of wireless communication deteriorates,
The communication device control method according to any one of appendices 23 to 28, which is any one of the above.

(Appendix 30)
further,
Obtaining information related to the application in the wireless terminal;
The predetermined period and the required value are calculated using information related to the acquired application.
The communication device control method according to attachment 29.

(Appendix 31)
The communication apparatus control method according to attachment 30, wherein the information related to the application includes a request delay of the application and a file size necessary for using the application.

(Appendix 32)
32. The communication device control method according to any one of appendices 28 to 31, wherein the application in the wireless terminal is an application program that is executed in the wireless terminal and affects QoE (Quality of Experience).

(Appendix 33)
A control method for a base station apparatus, including the control method for a communication apparatus according to any one of appendices 23 to 32.

(Appendix 34)
The suppression of communication to the wireless terminal does not allocate radio resources to the wireless terminal that is the target of communication suppression, the forced disconnection of the wireless link with the wireless terminal that is the target of communication suppression, the communication 34. The base station apparatus according to appendix 33, which is realized by either setting an allocation index of the radio terminal that is subject to suppression of the radio terminal relatively lower than an allocation index of another radio terminal.

(Appendix 35)
A control method for a base station apparatus described in appendix 34, wherein
Estimating an available bandwidth that is a bandwidth that can be used in the wireless terminal in which the amount of data that can be transmitted is less than the required value with respect to the wireless bandwidth that the base station device has,
Calculating the amount of transmittable data based on the available bandwidth;
A control method for a base station apparatus.

(Appendix 36)
37. The method of controlling a base station apparatus according to supplementary note 35, wherein priority is given to communication with a wireless terminal for which the transmittable data amount calculated using the available bandwidth is equal to or greater than a required value.

(Appendix 37)
A control method for a relay device, including the control method for a communication device according to any one of appendices 23 to 32.

(Appendix 38)
The suppression of communication with the wireless terminal is one of forced termination of a session with the wireless terminal that is the target of communication suppression, stop of transmission addressed to the wireless terminal, and reduction of the transmission rate addressed to the wireless terminal. The control method of the relay apparatus described in Supplementary Note 37, realized by:

(Appendix 39)
A method for controlling a server device, including the method for controlling a communication device according to any one of appendices 23 to 32.

(Appendix 40)
The suppression of communication with the wireless terminal is one of forced termination of a session with the wireless terminal that is the target of communication suppression, stop of transmission addressed to the wireless terminal, and reduction of the transmission rate addressed to the wireless terminal. 40. The server device control method according to appendix 39, realized by:

(Appendix 41)
The communication device computer,
A transmission data amount calculation means for calculating a data amount that can be transmitted to the wireless terminal during a predetermined period;
The required value, which is the amount of data required in the wireless terminal, is compared with the transmittable data amount, and if the transmittable data amount is less than the required value, communication with the wireless terminal is suppressed. Communication control means,
Program of the communication device for operating as

(Appendix 42)
The supplementary note 41 is described, wherein the communication control unit is configured to execute a procedure of suppressing communication with the wireless terminal by performing communication only with the wireless terminal having the transmittable data amount equal to or greater than the required value. Communication device program.

(Appendix 43)
In the communication control means,
A procedure for selecting one or more wireless terminals from among the wireless terminals whose transmittable data amount is less than the required value;
Executing a procedure for suppressing communication to the selected wireless terminal;
In the transmission data amount calculation means,
Each time communication to the wireless terminal is suppressed, a procedure for recalculating the transmittable data amount is executed,
In the communication control means,
After the recalculation, causing the selection of the wireless terminal and the procedure of suppressing the communication to be executed again.
The communication device program described in appendix 42.

(Appendix 44)
A program for a base station device, including a program procedure for a communication device according to any one of appendices 41 to 43.

(Appendix 45)
The communication control unit is configured to suppress communication with the wireless terminal, do not assign radio resources to the wireless terminal that is a target of communication suppression, and wireless communication with the wireless terminal that is a target of communication suppression. (44) causing a procedure to be realized by any one of setting an allocation index of the wireless terminal to be subject to forced link disconnection and communication suppression to be relatively lower than an allocation index of another wireless terminal; The program of the base station apparatus described in 2.

(Appendix 46)
The base station computer,
With respect to the radio band possessed by the base station apparatus, operate as an available band estimation means for estimating an available band that is a band that can be used in the radio terminal in which the amount of data that can be transmitted is less than the required value,
Causing the transmission data amount calculation means to execute a procedure of calculating the transmittable data amount based on the available bandwidth;
The program of the base station apparatus described in appendix 45.

(Appendix 47)
47. The base station apparatus according to appendix 46, wherein the communication control unit causes a procedure to prioritize communication to the wireless terminal for which the transmittable data amount calculated based on the available bandwidth is equal to or greater than the required value. Program.

(Appendix 48)
A program for a relay apparatus, including a procedure for a control program for a communication apparatus according to any one of appendices 41 to 43.

(Appendix 49)
The communication control means is configured to suppress communication with the wireless terminal, forcibly terminate a session with the wireless terminal subject to communication suppression, stop transmission to the wireless terminal, and transmit to the wireless terminal. 48. The relay device program according to appendix 48, wherein a program realized by any of the rate reductions is executed.

(Appendix 50)
A program for a server device, including a program procedure for a communication device according to any one of appendices 41 to 43.

(Appendix 51)
The communication control means suppresses communication with the wireless terminal, forcibly terminates a session with the wireless terminal that is subject to communication suppression, stops transmission to the wireless terminal, and transmits to the wireless terminal. The program of the server apparatus as described in attachment 50 which performs the procedure implement | achieved by either of the fall of a rate.

1, 2, 3, 4, 5 Communication system 10 Server device 20, 21, 22, 23, 24 Wireless base station 30 Wireless terminal 40, 41, 42 Relay device 201 Basic function unit 202, 212, 242 Transmission data amount calculation unit 203, 213, 223, 243 Communication control unit 244 Available bandwidth estimation unit 401 Basic function unit 402 Information acquisition unit 403 Information notification unit 414, 424 Communication control unit 425 Transmission data amount calculation unit

Claims (10)

A transmission data amount calculating means for calculating a data amount that can be transmitted to the wireless terminal during a predetermined period;
The required value, which is the amount of data required in the wireless terminal, is compared with the transmittable data amount, and if the transmittable data amount is less than the required value, communication with the wireless terminal is suppressed. Communication control means;
A communication device comprising:   The communication apparatus according to claim 1, wherein the communication control unit suppresses communication with the wireless terminal by causing only the wireless terminal having the transmittable data amount to exceed the required value to perform communication. The communication control means includes
Selecting one or more wireless terminals from among the wireless terminals whose transmittable data amount is less than the required value;
Suppress communication to the selected wireless terminal;
The transmission data amount calculation means includes:
Each time communication to the wireless terminal is suppressed, the amount of data that can be transmitted is recalculated,
The communication control means includes
After the recalculation, the selection of the wireless terminal and the suppression of the communication are performed again.
The communication apparatus according to claim 1. The required value is
The amount of data required to use the application in the wireless terminal, and
The amount of data used by the application in the wireless terminal within the stay time of the wireless terminal in an area where the wireless quality of wireless communication deteriorates,
The communication device according to claim 1, wherein the communication device is any one of the above. The transmission data amount calculation means calculates the predetermined period,
Request delay of application in the wireless terminal, and
Time until the wireless terminal enters an area where wireless quality of wireless communication deteriorates,
The communication apparatus according to claim 1, wherein calculation is performed based on any one of the following.   A base station apparatus comprising the communication apparatus according to claim 1.   A relay device comprising the communication device according to claim 1.   A server device comprising the communication device according to claim 1. A transmission data amount calculation means for calculating a data amount that can be transmitted to the wireless terminal during a predetermined period, and a required value that is a data amount required in the wireless terminal is compared with the transmittable data amount. A base station apparatus comprising: first communication control means for notifying outside of information related to the wireless terminal whose transmittable data amount is less than the required value; and
A relay device comprising second communication control means for suppressing communication with the wireless terminal to which information related to the wireless terminal has been notified;
A communication system comprising: Calculate the amount of data that can be transmitted to the wireless terminal during a given period,
Compare the required value, which is the amount of data required in the wireless terminal, with the amount of data that can be transmitted,
If the amount of data that can be transmitted is less than the required value, suppress communication with the wireless terminal,
A method for controlling a communication device.

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