WO2016042686A1 - Dispositif et procédé de commande de transmission de données - Google Patents

Dispositif et procédé de commande de transmission de données Download PDF

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Publication number
WO2016042686A1
WO2016042686A1 PCT/JP2015/002235 JP2015002235W WO2016042686A1 WO 2016042686 A1 WO2016042686 A1 WO 2016042686A1 JP 2015002235 W JP2015002235 W JP 2015002235W WO 2016042686 A1 WO2016042686 A1 WO 2016042686A1
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WIPO (PCT)
Prior art keywords
transmission rate
base station
wireless
data
wired line
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PCT/JP2015/002235
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English (en)
Japanese (ja)
Inventor
大輔 太田
高道 井上
航生 小林
尚 二木
信清　貴宏
松永　泰彦
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日本電気株式会社
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Publication of WO2016042686A1 publication Critical patent/WO2016042686A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/40—Support for services or applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H04W28/12—Flow control between communication endpoints using signalling between network elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H04W28/14—Flow control between communication endpoints using intermediate storage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/14—Interfaces between hierarchically different network devices between access point controllers and backbone network device

Definitions

  • the present invention relates to a data transmission control device, a control method, and a program, and more particularly, to a data transmission control device, a control method, and a program for controlling a flow rate to a buffer of a base station used in a wireless communication network.
  • TCP Transmission Control Protocol
  • OSI Open Systems Interconnection
  • retransmission timeout This waiting time until retransmission is referred to as retransmission timeout (RTO: Retransmission Time Out).
  • congestion control is performed to control the amount of data per unit time transmitted by the transmission side in accordance with the congestion status of the network (Non-Patent Document 2). Specifically, a packet in a window called a congestion window (CWND; Congestion Window Size) provided on the transmission side is transmitted.
  • the congestion window size basically increases when an acknowledgment of a transmitted packet is obtained, and decreases when a retransmission timeout occurs.
  • congestion control methods for realizing high-speed communication have been actively studied, and various congestion window size update algorithms have been proposed.
  • LTE Long Term Evolution
  • LTE Advanced Long Term Evolution Advanced
  • the protocol defined by LTE or LTE Advanced corresponds to a protocol below layer 2 (data link layer) in the OSI basic reference model. Therefore, in a communication system including LTE, as shown in FIG. 16, the wireless terminal 930 and the server apparatus 910 communicate using a protocol of layer 3 (network layer) or higher in the OSI basic reference model such as TCP.
  • the wireless terminal 930 and the base station 920 communicate with each other using a layer 2 or lower protocol (LTE or LTE Advanced).
  • LTE or LTE Advanced a layer 2 or lower protocol
  • the server apparatus 910 and the base station 920 are connected via a communication line 940 (for example, the Internet and an LTE core network (EPC)) and wirelessly connected to the base station 920.
  • a terminal 930 is connected via a wireless interface 950.
  • protocols and communication characteristics are different between the wireless terminal 930 and the base station 920 (wireless section) and between the base station 920 and the server device 910 (wired section). .
  • the base station 920 includes a buffer 921 for accumulating data addressed to the wireless terminal 930 arriving from the server device 910 until layer 2 transmission to the wireless terminal 930 is completed.
  • the wireless section has a larger band fluctuation (change in communication speed) than the wired section. For this reason, a large-capacity buffer is provided in the base station 920 for the purpose of absorbing the influence of the band fluctuation in the wireless section.
  • Patent Document 1 discloses a technique related to a mobile communication system including a base station and a control station. The technique according to Patent Document 1 is based on the time until data staying in a buffer of a base station is sent to the mobile station, and the amount of data sent from the control station to the mobile station (the transmission rate of the wired line). ).
  • Patent Document 2 discloses a technique related to a mobile communication system including a radio base station and a base station control device.
  • the technique according to Patent Document 2 uses the average value of the downlink data rate (radio channel transmission rate) from a radio base station to a radio communication terminal, so that the base station controller can connect the radio communication terminal and its communication destination device. It controls the communication band.
  • the downlink data rate radio channel transmission rate
  • Non-Patent Document 3 discloses a method for predicting stochastic diffusion based on a Wiener process model.
  • Patent Documents 1 and 2 have a problem that the response to the sudden change in the communication speed in the wireless section is insufficient. Hereinafter, the reason will be described step by step.
  • the data newly arrived at the buffer 921 (packet P2) is the packet that arrived at the buffer 921 at a time before the packet P2.
  • Transmission to the wireless terminal 930 is not possible until transmission of P1 is completed. Therefore, the waiting time until transmission to the wireless terminal 930 is increased. Therefore, when the packet P2 is a packet retransmitted by TCP, the delay time of the packet P2 becomes excessively large, and the TCP throughput decreases. As a result, in the upper layer, it takes time to arrive after the retransmission packet P2. Therefore, in the wireless terminal 930, streaming content such as video and audio is interrupted, and the user's quality of experience deteriorates.
  • the waiting time until the packet P1 and the like stored in the buffer 921 is transmitted to the wireless terminal 930 becomes longer.
  • the amount of data stored in the buffer 921 of the base station 920 is large, a retransmission timeout occurs in TCP before the packet arrives at the wireless terminal 930, and transmission of a wired line from the server device 910 to the base station 920 is performed.
  • the rate drops significantly.
  • the amount of data stored in the buffer 921 of the base station 920 becomes empty.
  • reproduction of streaming content such as video and audio is interrupted.
  • the base station 920 transmits the same data a plurality of times, so that radio resources are wasted. This deprives other wireless terminals of transmission opportunities and reduces the TCP throughput of those wireless terminals.
  • the base station monitors the transmission rate of the radio link between the base station and the mobile station, and obtains the current transmission rate obtained by monitoring and the amount of data retained in the buffer. It is used to control the amount of data sent from the control station to the mobile station (corresponding to the transmission rate of the wired line).
  • the communication band to be allocated is controlled using the average value of the downlink data rate. However, simply using the average value of the current transmission rate and the past data rate of the wireless line is insufficient to cope with a sudden change in the communication speed of the wireless section.
  • the communication speed in the wireless section is drastically decreasing, it can be said that the future transmission rate of the wireless line is further reduced from the current transmission rate obtained by monitoring. Furthermore, the average value of the transmission rates before the current time is higher than the current transmission rate. Therefore, the average value of the current transmission rate used in Patent Document 1 and the past transmission rate used in Patent Document 2 has a large difference from the future transmission rate, and appropriate control of the transmission rate in the wired section can be performed. Have difficulty.
  • An object of the present invention is to provide a data transmission control device, a control method, and a program for avoiding the deterioration of the user's feeling and improving the quality of experience of the user.
  • a data transmission control device includes: A data transmission control device for receiving data addressed to the wireless terminal to be transmitted to a wireless terminal via a wireless base station from a relay device provided at a higher level of the wireless base station, Obtaining means for obtaining at least one of quality information and a transmission rate of a wireless channel between the wireless base station and the wireless terminal; Information for controlling the transmission rate of the wired line between the relay device and the wireless base station is determined based on the quality information of the wireless line or a change tendency of the transmission rate, and the transmission rate of the wired line is controlled. Control means for notifying the relay device.
  • the control method of the data transmission control device is: A data transmission control apparatus control method for receiving data addressed to a radio terminal to be transmitted to a radio terminal via a radio base station from a relay apparatus provided at a higher level of the radio base station, Obtaining at least one of quality information and transmission rate of a radio channel between the radio base station and the radio terminal; Information for controlling the transmission rate of the wired line between the relay device and the wireless base station is determined based on the quality information of the wireless line or a change tendency of the transmission rate, and the transmission rate of the wired line is controlled. To the relay device.
  • the data transmission control device is: A data transmission control apparatus that communicates with a radio base station that transmits data addressed to a radio terminal to the radio terminal, Acquisition means for acquiring at least one of quality information and a transmission rate of a radio channel between the radio base station and the radio terminal from the radio base station; Control means for controlling the transmission rate of the wired line with the wireless base station based on the quality information of the wireless line or the changing tendency of the transmission rate.
  • the control method of the data transmission control device is: A control method of a data transmission control apparatus that communicates with a radio base station that transmits data addressed to a radio terminal, Obtaining at least one of quality information and transmission rate of a radio channel between the radio base station and the radio terminal; The transmission rate of the wired line with the wireless base station is controlled based on the quality information of the wireless line or the changing tendency of the transmission rate.
  • the future wireless channel transmission rate (wireless channel transmission rate) between the base station and the wireless terminal connected to the base station is estimated until a predetermined time elapses, and the predetermined result is obtained from the estimation result.
  • the transmission data amount can be stored in the buffer of the base station regardless of the magnitude of the fluctuation of the radio channel quality.
  • FIG. 2 shows the configuration of the communication system 1 according to the first embodiment of the present invention.
  • an LTE communication system is assumed as the communication system 1.
  • a communication system other than LTE such as UMTS (Universal Mobile Telecommunication Systems) or GSM (registered trademark) (Global System for Mobile communications), may be assumed.
  • the communication system 1 includes a traffic management device 10 (an example of a relay device and a data transmission control device), a base station 20 (an example of a radio base station and a data transmission control device), and a radio terminal 30.
  • the traffic management device 10 and the base station 20 are communicably connected to each other via an LTE core network (EPC: Evolved Packet Core) N1.
  • EPC Evolved Packet Core
  • GTP GPRS (General Packet Radio Service) Tunneling Protocol
  • the base station 20 and the wireless terminal 30 are connected to each other via a wireless interface N2 so as to communicate with each other.
  • the traffic management device 10 is connected to a server device (for example, a server that distributes audio / video content such as Youtube (registered trademark)) via a communication line (for example, the Internet) NW that is an arbitrary network. Connected as possible. Then, the traffic management device 10 sends the data addressed to the wireless terminal 30 received via the communication line NW to the wireless terminal 30 via the wired line (for example, the LTE core network N1) (specifically, the base station). 20) is an example of a data transmission control device to be transmitted. The base station 20 stores data received from the traffic management device 10 in a buffer, and then transmits data stored in the buffer to the wireless terminal 30 via a wireless line (for example, wireless interface N2). It is an example of a control apparatus.
  • a server device for example, a server that distributes audio / video content such as Youtube (registered trademark)
  • NW for example, the Internet
  • NW for example, the Internet
  • the traffic management device 10 sends the data addressed to the wireless terminal 30 received via the communication line
  • the communication system 1 includes only one traffic management device 10, one base station 20, and one wireless terminal 30, but the number of traffic management devices 10 may be any number. Similarly, the number of base stations 20 and the number of wireless terminals 30 may be any number.
  • the traffic management device 10 includes an information processing device (not shown).
  • the information processing apparatus includes a central processing unit (CPU; Central Processing Unit) (not shown) and a storage device (memory and hard disk drive (HDD)).
  • the traffic management device 10 may be configured to realize functions to be described later when the CPU executes a program stored in the storage device.
  • the base station 20 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 base station 20 may be configured to realize functions to be described later when the CPU executes a program stored in the storage device.
  • the wireless terminal 30 is a mobile phone terminal, personal computer, PHS (Personal Handyphone System) terminal, PDA (Personal Data Assistant, Personal Digital Assistant), smartphone, tablet terminal, car navigation terminal, game terminal, or the like. is there.
  • the wireless terminal 30 includes a CPU, a storage device (memory), an input device (key buttons and a microphone), and an output device (display and speaker).
  • the wireless terminal 30 has a function of transmitting / receiving a wireless signal between the base station 20 connected to the wireless terminal 30 (a communication link is established) by the CPU executing a program stored in the storage device.
  • a function provided in the wireless terminal 30 is realized. As described above, since the functions of the wireless terminal 30 are well-known matters for those skilled in the art, description of each component of the terminal configuration 30 is omitted.
  • FIG. 3 is a block diagram showing functions in the communication system 1 configured as described above.
  • the traffic management device 10 includes a traffic management device operation unit 101, a buffer 102, and a wired line transmission rate control unit 103.
  • the traffic management device operation unit 101 includes TCP, which is a layer 4 protocol in the OSI basic reference model. Then, the traffic management device operation unit 101 uses the TCP protocol to transmit / receive signals to / from a server device (not shown) via the communication line NW, and the base network 20 and the LTE core network using a protocol lower than GTP. It has a function of transmitting and receiving signals via N1. In this embodiment, the traffic management apparatus operation unit 101 temporarily accumulates transmission data addressed to each wireless terminal 30 received via the communication line NW in the buffer 102, and the data accumulated in the buffer 102 is a wired line. The data is transferred to the base station 20 at a wired line transmission rate controlled by the transmission rate control unit 103.
  • TCP is a layer 4 protocol in the OSI basic reference model. Then, the traffic management device operation unit 101 uses the TCP protocol to transmit / receive signals to / from a server device (not shown) via the communication line NW, and the base network 20 and the LTE core network using a protocol lower than GTP.
  • an LTE mobile network N1 composed of EPC and EUTRAN (Evolved Universal Terrestrial Radio Network) has a longer delay time for data transmission / reception than the communication line NW. Therefore, in the present embodiment, transmission data addressed to each wireless terminal 30 that arrives via the communication line NW is stored in the buffer 102 until the wireless terminal 30 ends communication.
  • EPC and EUTRAN Evolved Universal Terrestrial Radio Network
  • the buffer 102 has a function of storing transmission data addressed to each wireless terminal 30 that arrives via the communication line NW.
  • the wired line transmission rate control unit 103 has a function of controlling the wired line transmission rate from the traffic management device 10 to the base station 20 in accordance with a notification from the wired line transmission rate supervision unit 204 of the base station 20 described later.
  • the wired line transmission rate control unit 103 receives an MTU (Maximum Transmission Unit) when receiving a notification from the wired line transmission rate supervision unit 204 of the base station 20 regarding an instruction to decrease the wired line transmission rate. Decrease by a predetermined multiple (1 or less) of the default value.
  • MTU Maximum Transmission Unit
  • the wired line transmission rate control unit 103 when the wired line transmission rate control unit 103 receives the notification regarding the instruction to increase the wired line transmission rate, the wired line transmission rate control unit 103 sets the MTU to a predetermined multiple (1 or less) of the default value within a range not exceeding the default value. Only increase.
  • the initial value of the MTU is a default value, and the default value is 1500 bytes, which is the same as the default value of the MTU in Ethernet (registered trademark), and the predetermined multiple is 0.1.
  • the control of the wired line transmission rate from the traffic management device 10 to the base station 20 is performed for each wireless terminal 30.
  • the function of the traffic management device 10 may be implemented by, for example, a P-GW (PDN Gateway) equipped with TCP installed in the LTE core network N1.
  • P-GW PDN Gateway
  • the base station 20 includes a base station operation unit 201, a buffer 202, a wireless channel transmission rate prediction unit 203, and a wired channel transmission rate supervision unit 204.
  • the base station operation unit 201 is an example of a receiving unit and a transmitting unit.
  • the base station operation unit 201 has a function of transmitting and receiving signals via the traffic management device 10 and the LTE core network N1. That is, the base station operation unit 201 receives data addressed to the wireless terminal received by the relay device via the network via a wired line. Further, the base station operation unit 201 accumulates the received data in the buffer 202.
  • the base station operation unit 201 also has a function of transmitting and receiving wireless signals between the base station 20 and the connected wireless terminal 30. That is, the base station operation unit 201 transmits the data stored in the buffer 202 to the wireless terminal 30 via the wireless line.
  • the base station operation unit 201 has functions provided in a base station in a general wireless communication system, such as a function of generating a reference signal used by the wireless terminal 30 to measure a communication channel quality with the base station 20.
  • a function of generating a reference signal used by the wireless terminal 30 to measure a communication channel quality with the base station 20 is a well-known matter of those skilled in the art, description of each function with which the base station operation
  • the buffer 202 has a function of accumulating transmission data addressed to each wireless terminal 30 arriving via the LTE core network N1 and information used for transmitting the transmission data.
  • the wireless channel transmission rate prediction unit 203 is an example of a prediction unit having a function of predicting a future wireless channel transmission rate between the base station 20 and the wireless terminal 30 connected to the base station 20. That is, the radio channel transmission rate prediction unit 203 predicts the future value or future change trend of the quality information of the radio channel from the change trend of the quality information of the current and past radio channels, and the predicted future value or change trend. Based on the above, the future value of the wireless line transmission rate for transmitting data to the wireless terminal 30 is predicted.
  • the change tendency is an index indicating a change amount, change state, change transition of information, or a change amount (change width or change speed) in the change.
  • the change tendency examples include an inclination obtained from at least two pieces of information, a differential value, a difference value, or an approximate function (such as an approximate line). Therefore, if it is a change tendency of radio channel quality, for example, it may be a change amount of radio channel quality per a plurality of predetermined times in a plurality of radio channel qualities respectively corresponding to a plurality of predetermined times.
  • the radio channel transmission rate prediction unit 203 includes information related to TBS (Transport Block Size) determined from the CQI and the number of RBs.
  • the wireless channel transmission rate prediction unit 203 is included in the number of wireless terminals 30 to which data stored in the buffer 202 is transmitted and CSI (Channel State Information) periodically reported from the wireless terminal 30.
  • the future radio channel transmission rate (the future value of the radio channel transmission rate) is predicted.
  • the transmission rate is an index indicating the amount of data that can be transmitted per unit time, or the amount of data that can be transmitted per unit transmission opportunity (TTI; Transmission Time Interval) (for example, MCS (Modulation and Coding Scheme)).
  • TTI Transmission Time Interval
  • MCS Modulation and Coding Scheme
  • the wireless line transmission rate is a wireless line transmission rate between the base station 20 and the wireless terminal 30 connected to the base station 20.
  • the predicted future wireless line transmission rate is used by the wired line transmission rate supervision unit 204. Note that the number of wireless terminals 30 to which data stored in the buffer 202 is transmitted corresponds to the number of wireless terminals 30 in communication.
  • the wireless channel transmission rate prediction unit 203 calculates the current value and the past value of the wireless channel transmission rate, and determines the future value of the wireless channel transmission rate or the future trend of the change from the changing trend of the current and past wireless channel transmission rates. May be predicted.
  • the radio channel transmission rate may be calculated based on radio channel quality information (example: CQI) as shown in Equation (4) described later, or can be measured by the base station 20 as described later. It may be calculated based on the throughput in each layer such as PDCP (Packet Data Convergence Protocol) layer.
  • PDCP Packet Data Convergence Protocol
  • the wired line transmission rate supervision unit 204 uses the accumulated data amount addressed to the wireless terminal 30 in the buffer 202 and the future transmission rate predicted by the wireless line transmission rate prediction unit 203 to control the wired line transmission rate of the traffic management device 10.
  • the control of the wired line transmission rate performed by the unit 103 is supervised.
  • the wired line transmission rate is the amount of data transmitted per unit time from the traffic management device 10 to the base station 20.
  • the wired line transmission rate supervision unit 204 transmits data addressed to the wireless terminal 30 from the traffic management device 10 to the base station 20 via the LTE core network N1 to the wired line transmission rate control unit 103.
  • An instruction (control method) for controlling the line transmission rate is given.
  • An instruction from the wired line transmission rate supervision unit 204 to the wired line transmission rate control unit 103 is specifically notified via the base station operation unit 201.
  • an instruction for controlling the wired line transmission rate (instruction for wired line transmission rate control) is performed by piggybacking the information on a GTP packet corresponding to the data transmitted by the wireless terminal 30.
  • the instruction for wired line transmission rate control may be performed by adding the information to the header area of the GTP packet.
  • the instruction of the wire transmission rate control may be performed by piggybacking the information on the UDP packet corresponding to the GTP packet by using UDP (User Datagram Protocol) used in the lower layer of the GTP. Good.
  • UDP User Datagram Protocol
  • the instruction for wired line transmission rate control may be performed by adding the information to the header area of the UDP packet.
  • an instruction for wired line transmission rate control may be performed by piggybacking the information on an IP packet corresponding to the GTP packet by an IP (Internet Protocol) used in a lower layer of the UDP.
  • the instruction for wired line transmission rate control may be performed by adding the information to the header area of the IP packet.
  • the wired line transmission rate control instruction is piggybacked to various packets corresponding to data transmitted by wireless terminals 30 other than the wireless terminal 30 instead of the various data transmitted by the wireless terminal 30. It may be done.
  • the instruction for controlling the wire transmission rate is performed by piggybacking on various packets corresponding to arbitrary data transmitted from the base station 20 to the traffic management device 10 or adding them to the header area of the various packets. May be.
  • the traffic management apparatus 10 identifies the wireless terminal 30 to be controlled by notifying the information regarding the wireless terminal 30 together (simultaneously) together with the information.
  • an instruction for wired line transmission rate control may be notified via a new interface installed between the traffic management apparatus 10 and the base station 20.
  • the communication system 1 described above predicts a future radio channel transmission rate between the base station 20 and the radio terminal 30 connected to the base station 20, and the predicted radio channel transmission rate and the base station 20
  • the operation procedure for controlling the wired line transmission rate of the data destined for the wireless terminal 30 transferred from the traffic management apparatus 10 to the base station 20 via the core network using the data amount stored in the buffer 202 will be described. .
  • FIG. 4 shows an operation procedure in which the radio channel transmission rate prediction unit 203 of the base station 20 predicts a future radio channel transmission rate between the base station 20 and the radio terminal 30 connected to the base station 20. It is.
  • the base station 20 performs the operation shown in FIG. 4 at every predetermined period. In the present embodiment, the base station 20 performs the operation of FIG. 4 every 1 [second] (hereinafter, the unit of the physical quantity is expressed by being enclosed in []). Note that the operation of FIG. 4 may be executed at a cycle shorter than 1 [second] or may be executed at a cycle longer than 1 [second].
  • the wireless channel transmission rate prediction unit 203 uses the least square method from the CQI reported from the wireless terminal 30 during the period from the current time to a predetermined time before, and uses an approximate straight line (CQI and time) (Linear equation) is obtained (step S101). That is, the wireless channel transmission rate prediction unit 203 predicts future change trends based on the current and past values of the quality information of the wireless channel by calculating the approximate straight line.
  • Equation (1) is a linear equation related to CQI and time obtained using the least square method.
  • T is the time at which CQI is to be predicted
  • T current is the current time.
  • a and b are variables, and are calculated using Equation (2) and Equation (3), respectively.
  • N is the total number of CQIs reported from the wireless terminal 30
  • i is an identification number for identifying each of the CQIs reported from the wireless terminal 30
  • Ti is This is the time when the CQI with the identification number i is reported.
  • the period from the current time to a predetermined time before is 10 [seconds], but may be a value larger than 10 [seconds] or may be a value smaller than 10 [seconds].
  • the wireless channel transmission rate prediction unit 203 predicts a future wireless channel transmission rate using Equation (4) (step S102).
  • TBS ( ⁇ ) is a function for deriving TBS determined from CQI and the number of RBs.
  • the wireless line transmission rate according to the present embodiment is a data amount (TBS) that can be transmitted per unit time. Since the wireless line transmission rate according to the present embodiment is determined from the bandwidth used at the time of transmission and its reception quality, it can be derived using Equation (4).
  • N RB is the number of resource blocks that can be allocated to the radio terminal 30 and is 50 in this embodiment.
  • N UE is the number of radio terminals 30 to which the data stored in the buffer 202 should be transmitted at the current time T current .
  • the transmission rate from the current time to 10 [seconds] later is predicted every 0.1 [seconds].
  • the predicted wireless line transmission rate may be a transmission rate up to a time before 10 [seconds] from the current time, or a transmission rate up to a time after 10 [seconds] from the current time. Good.
  • the period of the predicted wireless line transmission rate may be a period shorter than 0.1 [seconds] or may be a period longer than 0.1 [seconds].
  • the wireless channel transmission rate prediction unit 203 performs the above processing for all the wireless terminals 30 connected to the base station 20. Note that the above processing may be performed only for a specific wireless terminal 30. Thereafter, the wireless line transmission rate prediction unit 203 ends the process of FIG.
  • FIG. 7 shows an operation procedure in which the wired line transmission rate supervision unit 204 of the base station 20 instructs the traffic management apparatus 10 on a method for controlling the wired line transmission rate from the traffic management apparatus 10 to the base station 20. is there.
  • the base station 20 executes the operation shown in FIG. 7 after the operation of the radio channel transmission rate prediction unit 203 is completed.
  • the wired line transmission rate supervision unit 204 calculates the amount of data D that can be transmitted to the wireless terminal 30 by the base station 20 by using the formula (5) (step S201).
  • the predetermined time is the time of the future wireless channel transmission rate of the wireless terminal 30 predicted by the wireless channel transmission rate prediction unit 203, but may be shorter than the time.
  • M is the number of samples of the future radio channel transmission rate of the radio terminal 30 predicted by the radio channel transmission rate prediction unit 203
  • j is an identification for identifying each of the radio channel transmission rates.
  • T j is the time at which the wireless line transmission rate of the identification number j is predicted.
  • the wired line transmission rate supervision unit 204 uses the data amount D calculated in step S201 and the accumulated data amount of the wireless terminal 30 accumulated in the buffer 202 of the base station 20 to use the traffic management device. 10 is notified of information for instructing a method for controlling the wired line transmission rate from the traffic management apparatus 10 to the base station 20 (step S202). That is, the wired line transmission rate supervision unit 204 controls the wired line transmission rate so that a data amount that satisfies the future value of the wireless transmission rate can be stored in the buffer.
  • the content of the instruction to the traffic management device 10 in step S202 is either content that lowers the wired line transmission rate from the traffic management device 10 to the base station 20 or content that increases the wired line transmission rate. is there.
  • the wired line transmission rate supervision unit 204 performs the above processing for all the wireless terminals 30 connected to the base station 20. The above process may be performed on a specific wireless terminal 30. Thereafter, the wired line transmission rate supervision unit 204 ends the process of FIG.
  • a future change trend of the quality information of the radio channel is predicted, and based on the predicted change trend, the base station 20 and the radio terminal 30 Predict future radio link transmission rates during Then, using the predicted wireless line transmission rate and the amount of data stored in the buffer 202 of the base station 20, the traffic management apparatus 10 forwards the wireless terminal 30 to the base station 20 via the LTE core network N1. It is possible to control the transmission line transmission rate of the data. Therefore, it is possible to avoid a decrease in TCP throughput and improve the quality of experience of the user. In particular, it is possible to improve the accuracy of the prediction of the radio channel transmission rate compared to the measured value of the current radio channel transmission rate or the average value of the past radio channel transmission rates.
  • the wired line transmission rate control unit 103 of the traffic management device 10 realizes control of the wired line transmission rate from the traffic management device 10 to the base station 20 by increasing or decreasing the MTU.
  • a restriction may be provided on the amount of data per unit time that the traffic management apparatus 10 can transmit to the base station 20, and the restriction may be set.
  • it may be realized by increasing / decreasing the size of CWND of TCP.
  • the traffic management apparatus 10 includes TCP, which is a layer 4 protocol in the OSI basic reference model, and controls the wired line transmission rate in the TCP layer.
  • the wired line transmission rate may be controlled in the IP layer, which is the layer 3 protocol. Specifically, it may be realized by setting priority in TOS (Time Of Service) in the header area of the IP packet corresponding to the GTP packet corresponding to the transmission data addressed to the wireless terminal 30. Or you may implement
  • TOS Time Of Service
  • the wired line transmission rate from the traffic management apparatus 10 to the base station 20 is increased.
  • the control of the wired line transmission rate by the IP layer may be used together with the control of the wired line transmission rate by the TCP layer, but may be performed instead of the control of the wired line transmission rate by the TCP layer.
  • the traffic management apparatus 10 does not need to include TCP, which is a layer 4 protocol in the OSI basic reference model.
  • the function of the traffic management apparatus 10 may be implemented by, for example, a P-GW that does not include TCP.
  • the radio channel transmission rate prediction unit 203 of the base station 20 derives an approximate straight line related to CQI and time as a future change trend based on current and past values in step S101.
  • Other values and indices may be used instead of CQI.
  • the radio channel transmission rate prediction unit 203 of the base station 20 converts the predicted CQI into SINR (Signal-to-Interference plus Noise power Ratio), and converts the converted SINR and approximate straight line regarding time into current and past values. It may be derived as a future change trend based.
  • SINR Signal-to-Interference plus Noise power Ratio
  • a target SINR that is a minimum SINR that can be set for each CQI and that can achieve a target error rate (BLER; Block Error Ratio) may be used.
  • BLER Block Error Ratio
  • the maximum CQI that satisfies the target SINR is calculated using the predicted SINR, and the TBS is derived from the CQI.
  • the base station 20 uses the uplink signal from the radio terminal 30 instead of deriving the SINR from the CQI periodically reported from the radio terminal 30.
  • the SINR may be derived.
  • the SINR is preferably derived by acquiring channel information between the base station 20 and the radio terminal 30 from the uplink signal and deriving the SINR from the channel information. Further, in this case, information such as interference power necessary for derivation of SINR may be reported from the radio terminal 30, or may be calculated by the base station 20.
  • the SINR is derived from the predicted RSRQ
  • the maximum CQI that satisfies the target SINR with the SINR is calculated
  • the TBS is derived from the CQI.
  • Equation (6) is an equation for deriving SINR from RSRQ.
  • N RB SC is the number of Subcarriers per RB.
  • SINR is derived from RSRP using Equation (7).
  • N ncell is the number of cells adjacent to a cell that is a communication area formed by the base station 20
  • y is an identification number for identifying each of the adjacent cells.
  • Noise is thermal noise. In an environment where base stations 20 are densely installed such as in urban areas, the thermal noise is negligibly small compared to RSRP, and therefore the Noise term can be deleted in Equation (7).
  • the radio channel transmission rate prediction unit 203 of the base station 20 uses the number N RB of the radio terminals 30 in which data to be transmitted to the buffer 202 is accumulated at the current time in Expression (4). and in a similar manner to derive the approximate curve as to the number N RB and time of the wireless terminal 30 may be used several N RB future of the wireless terminal 30 is calculated from the derived approximate curve.
  • the latest CQI reported up to the current time is used as the CQI used in step S102, but by deriving from an approximate straight line related to CQI and time, the prediction accuracy of the radio channel transmission rate can be improved.
  • the theoretical limit of the radio channel transmission rate can be calculated as a predicted value.
  • the remaining reproduction time calculation unit 204 of the base station 20 may calculate the future wireless line transmission rate using Equation (8) instead of Equation (4).
  • Equation (8) B is the system bandwidth.
  • the wireless channel transmission rate prediction unit 203 calculates the current value and the past value of the wireless channel transmission rate, and determines the future value of the wireless channel transmission rate or the future trend of the change from the changing trend of the current and past wireless channel transmission rates. May be predicted. That is, the wireless channel transmission rate prediction unit 203 of the base station 20 derives an approximate straight line regarding the throughput (communication speed) and time of the wireless section as a future change tendency based on the current and past values in step S101. Good.
  • the throughput may be a PDCP (Packet Data Convergence Protocol) layer throughput, an RLC (Radio Link Control) layer throughput, or a MAC (Medium Access Control) layer throughput that can be measured by the base station 20.
  • OTA Over-The-Air
  • the future wireless line transmission rate is calculated using Equation (9).
  • the radio channel transmission rate prediction unit 203 of the base station 20 converts an approximate straight line related to RTT (Round Trip Time) and time between the traffic management device 10 and the radio terminal 30 to current and past values. It may be derived as a future change trend based.
  • the traffic management device 10 measures the RTT and notifies the base station 20 of information related to the RTT at every predetermined period.
  • the notification from the traffic management device 10 to the base station 20 may be realized by piggybacking the information on the GTP packet corresponding to the data addressed to the wireless terminal 30. Alternatively, the notification may be realized by adding information related to the instruction to the header area of the GTP packet.
  • the notification may be performed by piggybacking the information on a UDP packet corresponding to the GTP packet using UDP (User Datagram Protocol) used in a lower layer of the GTP.
  • UDP User Datagram Protocol
  • the notification may be performed by adding the information to the header area of the UDP packet.
  • the notification may be performed by piggybacking the information on an IP packet corresponding to the GTP packet by an IP (Internet Protocol) used in a lower layer of the UDP.
  • the notification may be performed by adding the information to the header area of the IP packet.
  • the notification is piggybacked to various packets corresponding to data transmitted to the wireless terminal 30 other than the wireless terminal 30 instead of the various data transmitted to the wireless terminal 30. It may be done.
  • the notification may be performed by piggybacking on various packets corresponding to arbitrary data transmitted from the traffic management apparatus 10 to the base station 20 or adding the various packets to the header area.
  • the traffic management apparatus 10 identifies the wireless terminal 30 to be controlled by notifying the information regarding the wireless terminal 30 together (simultaneously) together with the information.
  • a new interface may be installed between the traffic management device 10 and the base station 20 and notified via the interface.
  • the wireless channel transmission rate prediction unit 203 calculates the future transmission rate using Equation (9) after converting the RTT into the throughput in step S102.
  • radio channel transmission rate prediction unit 203 of the base station 20 derives an approximate line related to CQI and time using the least square method
  • other estimation methods such as a maximum likelihood estimation method may be used.
  • the update size of the wired line transmission rate from the traffic management apparatus 10 to the base station 20 is determined by the wired line transmission rate control unit 103 of the traffic management apparatus 10. It may be determined by the transmission rate supervision unit 204. In this case, when the wired line transmission rate supervision unit 204 notifies the traffic management apparatus 10 regarding an instruction to increase the wired line transmission rate, the wired line transmission rate supervision unit 204 additionally notifies the update size. In addition, when the suppression level of the wired line transmission rate is determined in advance, and the wired line transmission rate supervision unit 204 notifies the traffic management apparatus 10 regarding an instruction to increase the wired line transmission rate, the suppression level is set. You may send it additionally.
  • the wired line transmission rate from the traffic management apparatus 10 to the base station 20 is controlled for each wireless terminal 30, but the wired line transmission rate may be controlled for each TCP flow.
  • the base station 20 has a function of DPI (Deep Packet Inspection), and identifies the TCP flow from the TCP header corresponding to the data addressed to the wireless terminal 30 transferred from the traffic management device 10 via the core network. Then, a method for controlling the wired line transmission rate is instructed for each flow. Further, in this case, when the base station 20 instructs the traffic management apparatus 10 to control the transmission rate of the wired line from the traffic management apparatus 10 to the base station 20, the base station 20 additionally notifies the flow information.
  • DPI Deep Packet Inspection
  • the traffic management device 10 can also be installed outside the LTE core network.
  • the base station 20 has a DPI function and starts from the source IP address described in the header area of the IP packet corresponding to the data addressed to the wireless terminal 30 transferred from the traffic management device 10 via the core network.
  • the traffic management device 10 is specified.
  • the base station 20 has a function of correcting the IP packet transmitted by the wireless terminal 30 and instructs the traffic management apparatus 10 on a method for controlling the wired line transmission rate from the traffic management apparatus 10 to the base station 20. In this case, the IP packet is corrected and notified so that information regarding the instruction can be added to the header area of the IP packet.
  • FIG. 9 shows an operation procedure in which the wired line transmission rate supervision unit 204 of the base station 20 controls the wired line transmission rate from the traffic management apparatus 10 to the base station 20 in the first embodiment.
  • the base station 20 executes the operation shown in FIG. 9 after the operation of the radio channel transmission rate prediction unit 203 is completed.
  • step S202 of FIG. 7 is deleted, and steps S301 to S306 are newly added.
  • steps S301 to S306 are newly added.
  • the wired line transmission rate supervision unit 204 calculates the upper threshold Thresh High of the stored data amount of the wireless terminal 30 stored in the buffer 202 of the base station 20 using Equation (10) (step S301).
  • D is the amount of data that the base station 20 can transmit to the wireless terminal 30 before the predetermined time calculated in step S201 has elapsed.
  • ⁇ High is a weighting coefficient used for calculation of the upper threshold value, and is 1.2 in this embodiment. However, ⁇ High may be larger than 1.2 or smaller than 1.2.
  • 0 High is an offset used for calculation of the upper limit threshold, and is 1 [MB] in the present embodiment. However, 0 High may be a value larger than 1 [MB], or may be a value smaller than 1 [MB].
  • the wired line transmission rate supervision unit 204 uses Expression (11), and the accumulated data amount B of the wireless terminal 30 accumulated in the base station 20 is larger than the upper limit threshold Thresh High calculated in Step S301. Whether or not (step S302).
  • the wired line transmission rate supervision unit 204 sends the traffic management device 10 to the base station. It is determined that the wired line transmission rate to 20 should be reduced. Then, the wired line transmission rate supervision unit 204 determines whether or not the traffic management apparatus 10 has already been instructed to decrease the wired line transmission rate (step S303).
  • the wired line transmission rate supervision unit 204 ends the process of FIG. 9 for the wireless terminal 30.
  • the wired line transmission rate supervision unit 204 notifies the traffic management apparatus 10 of the wired line transmission rate. Information for instructing a decrease in the amount is notified (step S304).
  • the wired line transmission rate supervision unit 204 sends a base point from the traffic management device 10 to the base. It is determined that the wired line transmission rate to the station 20 should be increased. Then, similarly to step S303, the wired line transmission rate supervision unit 204 determines whether or not the traffic management apparatus 10 has already been instructed to decrease the wired line transmission rate (step S305).
  • step S305 If the traffic management apparatus 10 has already been notified of the decrease in the wired line transmission rate (YES in step S305), the wired line transmission rate supervision unit 204 notifies the traffic management apparatus 10 of the wired line transmission rate. Information for instructing an increase is notified (step S306). By executing step S306, the decrease in the wired line transmission rate executed in step S304 is cancelled.
  • the wired line transmission rate supervision unit 204 ends the processing of FIG. 9 for the wireless terminal 30. .
  • step S303 if the traffic management apparatus 10 has already been notified of the decrease in the wired line transmission rate (YES in step S303), the wired line transmission rate supervision unit 204 sends the traffic management apparatus 10 Information for instructing a further decrease in the wired line transmission rate may be notified. Alternatively, the processing in step S303 may be omitted, and at this time, the wired line transmission rate control unit 103 of the traffic management apparatus 10 decreases the wired line transmission rate each time the notification in step S304 is received. May be.
  • the wired line transmission rate supervision unit 204 may notify the traffic management apparatus 10 of information for instructing to release the decrease in the wired line transmission rate in stages. Alternatively, in this case, the wired line transmission rate supervision unit 204 may notify information for instructing to immediately eliminate the decrease in the wired line transmission rate. Or you may abbreviate
  • step S303 and steps S305 to S306 are omitted, and the wired line transmission rate control unit 103 of the traffic management apparatus 10 reduces the wired line transmission rate for a predetermined time after receiving the notification of step S304. You may make it make it. In this case, it is preferable that the predetermined time be a period in which the base station 20 executes the process of FIG.
  • the weighting coefficient ⁇ High used in the calculation of the upper limit threshold value used in Expression (10) may be changed according to the amount of change in the wireless channel transmission rate between the base station 20 and the wireless terminal 30. For example, by increasing the wireless terminal 30 having a larger CQI variation amount, it is possible to absorb the influence of the band variation in the wireless section. Further, instead of the weighting coefficient ⁇ High, the offset 0 High used for the calculation of the upper limit threshold value may be changed, or both ⁇ High and 0 High may be changed.
  • the traffic management apparatus 10 When the wired line transmission rate supervision unit 204 determines in step S302 that the wired line transmission rate from the traffic management apparatus 10 to the base station 20 should be reduced (YES in step S302), the traffic management apparatus 10 is notified.
  • the TCP retransmission timeout time threshold may be notified to be updated to a high value.
  • Expression (11) since the data stored in the buffer 202 of the base station 20 has a long waiting time until it is transmitted to the wireless terminal, the probability that a retransmission timeout will occur in TCP increases. Therefore, when Expression (11) is satisfied, the probability of occurrence of the retransmission timeout can be reduced by updating the TCP retransmission timeout threshold to a high value.
  • the amount of data that the base station can transmit to the wireless terminal before the elapse of a predetermined time is When the amount of stored data is excessively smaller than the amount of data stored in the buffer of the base station, the transmission rate of the wired line from the traffic management device to the base station for the wireless terminal is increased to increase the amount of data stored in the buffer.
  • FIG. 11 shows an operation procedure in which the wired line transmission rate supervision unit 204 of the base station 20 controls the wired line transmission rate from the traffic management apparatus 10 to the base station 20 in the second embodiment.
  • the base station 20 executes the operation illustrated in FIG. 11 after the operation of the radio channel transmission rate prediction unit 203 is completed.
  • steps S401 to S402 are newly added to FIG.
  • steps S401 to S402 are newly added to FIG.
  • steps S401 to S402 will be described.
  • the wired line transmission rate supervision unit 204 calculates the lower limit threshold Thresh Low of the stored data amount of the wireless terminal 30 stored in the buffer 202 of the base station 20 using Equation (12) (step S401).
  • ⁇ Low is a weighting coefficient for calculating the lower limit threshold value that is smaller than ⁇ High , and is 1.0 in this embodiment.
  • ⁇ Low may be a value greater than 0 and less than or equal to ⁇ High .
  • 0 Low is an offset used for calculation of the lower limit threshold, and is set to 0.5 [MB] in the present embodiment.
  • 0 Low may be a value greater than 0 and not greater than 0 High .
  • ⁇ Low and 0 Low are respectively changed according to the fluctuation amount of the radio line transmission rate between the base station 20 and the radio terminal 30 connected to the base station 20. Also good.
  • the wired line transmission rate supervision unit 204 determines whether or not the stored data amount B of the wireless terminal 30 stored in the base station 20 is smaller than the lower limit threshold Thresh Low using Equation (13). (Step S402). When the stored data amount B of the wireless terminal 30 stored in the base station 20 is smaller than the lower threshold Thresh Low (step S402, YES), the wired line transmission rate supervision unit 204 executes the process of step S305. To do. On the other hand, when the stored data amount B of the wireless terminal 30 stored in the base station 20 is equal to or greater than the lower limit threshold Thresh Low , the wired line transmission rate supervision unit 204 ends the processing of FIG. 9 for the wireless terminal 30. .
  • step S401 when the traffic management apparatus 10 has already been notified of the decrease in the wired line transmission rate (step S303, YES), the wired line transmission rate supervision unit 204 sends the traffic management apparatus 10 Information for instructing a further decrease in the wired line transmission rate may be notified.
  • the processing in step S303 may be omitted, and at this time, the wired line transmission rate control unit 103 of the traffic management apparatus 10 decreases the wired line transmission rate each time the notification in step S304 is received. May be.
  • step S303 and step S305 are omitted, and the wired line transmission rate control unit 103 of the traffic management device 10 reduces the wired line transmission rate for a predetermined time after receiving the notification of step S304, and The wire transmission rate may be increased for a predetermined time after receiving the notification in step S306.
  • the predetermined time is a cycle in which the base station 20 executes the processing of FIG.
  • the lower limit threshold Thresh Low may be calculated from the minimum quality required in the application in which the data addressed to the wireless terminal 30 is used. In this case, it is calculated from the QoS (Quality of Service) Delay Budget of the data addressed to the wireless terminal 30 and the lowest rate.
  • QoS Quality of Service
  • the second embodiment is the same as the first embodiment of the present invention except that a gateway device is newly provided between the traffic management device and the base station.
  • FIG. 12 shows the configuration of the communication system 2 according to the second embodiment of the present invention.
  • the communication system 2 is newly provided with a gateway device 40 as compared with the communication system 1 in the first embodiment.
  • the gateway device 40 constitutes a part of the LTE core network (EPC) N1 and connects the traffic management device 10 and the base station 20 so as to communicate with each other. Only the gateway device 40 will be described below.
  • EPC LTE core network
  • the gateway device 40 has a function of transferring information for instructing a method of controlling a wired line transmission rate from the traffic management device 10 to the base station 20 arriving from the base station 20 to the traffic management device 10. For example, when the base station 20 notifies the gateway device 40 of the GTP packet corresponding to the data transmitted by the wireless terminal 30 by adding information related to the instruction to the GTP packet, the gateway device 40 determines that the wireless terminal 30 corresponding to the GTP packet In the transfer of the transmitted data to the traffic management device 10, as with the base station 20, information related to the instruction is added and notified in the header area of the GTP packet.
  • the gateway 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 gateway device 40 is configured to realize the functions of the gateway device 40 including the above-described functions by the CPU executing a program stored in the storage device.
  • description of each component of the terminal structure 30 is abbreviate
  • the communication system 2 in the second embodiment predicts a future radio channel transmission rate between the base station 20 and the radio terminal 30 connected to the base station 20, and the predicted radio channel transmission rate and the base station
  • the operation of controlling the wired line transmission rate of the data addressed to the wireless terminal 30 transferred from the traffic management apparatus 10 to the base station 20 via the core network using the data amount stored in the 20 buffers 202 is as follows. Since it is not different from the communication system 1 in the first embodiment, the description thereof is omitted.
  • a third embodiment of the present invention will be described in detail with reference to the drawings.
  • a future spread (probabilistic spread) of a wireless channel transmission rate between a base station and a wireless terminal connected to the base station is predicted and predicted.
  • the wired line transmission rate of the traffic management device is controlled so that the amount of data to be accumulated in the buffer of the base station based on the diffusion spread of the wireless line transmission rate can be accumulated.
  • a method for predicting stochastic diffusion based on the Wiener process model described in Non-Patent Document 3 is used.
  • FIG. 14 is a block diagram showing functions in a communication system according to the third embodiment of the present invention.
  • the traffic management device 10 and the base station 50 are connected to be communicable with each other via an LTE core network (EPC) N1.
  • the base station 50 and the wireless terminal 30 are connected to each other via a wireless interface N2 so as to communicate with each other.
  • EPC LTE core network
  • the base station 50 replaces the wireless line transmission rate prediction unit 203 and the wired line transmission rate supervision unit 204 with a wireless line transmission rate prediction unit 503 and a wired line transmission rate.
  • a director 504 is provided.
  • the wireless line transmission rate prediction unit 503 and the wired line transmission rate supervision unit 504 will be described.
  • the wireless line transmission rate prediction unit 503 is an example of a prediction unit.
  • the radio channel transmission rate prediction unit 503 has a function of predicting a spread spread (probabilistic spread) based on the current and past radio channel transmission rates between the base station 50 and the connected radio terminal 30 as a future change trend. Have.
  • the wireless channel transmission rate prediction unit 503 predicts the probabilistic diffusion based on the Wiener process model described in Non-Patent Document 3 in order to predict the future change trend of the quality information of the wireless channel. Use the technique.
  • the radio channel transmission rate prediction unit 503 includes information on TBS determined from the CQI and the number of RBs.
  • the wireless line transmission rate prediction unit 503 uses the number of wireless terminals 30 that are the transmission destinations of the data stored in the buffer 202 and the CQI included in the CSI periodically reported from the wireless terminal 30, Predict stochastic spread based on current and past radio link transmission rates. The predicted spread of the future wireless line transmission rate is used by the wired line transmission rate supervision unit 504.
  • the wired line transmission rate supervision unit 504 uses the accumulated data amount addressed to the wireless terminal 30 in the buffer 202 and the probabilistic spread of the future wireless line transmission rate predicted by the wireless line transmission rate prediction unit 503 to use the traffic management device 10.
  • the wired line transmission rate control unit 103 supervises the control of the wired line transmission rate. That is, the wired line transmission rate supervision unit 504 instructs the wired line transmission rate control unit 103 (control method) to control the wired line transmission rate from the traffic management device 10 to the base station 50.
  • the instructions from the wired line transmission rate supervision unit 204 to the wired line transmission rate control unit 103 are the same as those in the first embodiment, and thus description thereof is omitted.
  • the communication system described above predicts the spread of the future radio channel transmission rate between the base station 50 and the radio terminal 30 connected to the base station 50, and the predicted radio channel transmission rate.
  • the wire transmission rate of the data addressed to the wireless terminal 30 transferred from the traffic management device 10 to the base station 20 via the core network is determined. An operation procedure to be controlled will be described.
  • FIG. 15 shows an operation in which the radio channel transmission rate prediction unit 503 of the base station 50 predicts the spread of the future radio channel transmission rate between the base station 50 and the radio terminal 30 connected to the base station 50. It represents a procedure.
  • the base station 50 executes the operation shown in FIG. 15 at every predetermined period. In the present embodiment, the base station 50 executes the operation of FIG. 15 every 1 [second]. Note that the operation of FIG. 15 may be executed at a cycle shorter than 1 [second] or may be executed at a cycle longer than 1 [second].
  • the wireless channel transmission rate prediction unit 203 calculates the stochastic spread of CQI of the wireless terminal 30 using Equation (14) (step S501).
  • CQI + T is the best CQI value expected at a future time T
  • CQI ⁇ T is the worst value CQI expected at a future time T.
  • the difference value between CQI + T and CQI ⁇ T calculated from Equation (14) is the stochastic diffusion of CQI at time T.
  • ⁇ is a drift coefficient, and in this embodiment, the least square method is used from the CQI reported from the wireless terminal 30 during a period from the current time to a predetermined time before, and the CQI and time are related. The slope of the approximate line.
  • the period from the current time to a predetermined time before is 10 [seconds], but may be a value larger than 10 [seconds] or may be a value smaller than 10 [seconds].
  • ⁇ is the variance of CQI reported from the wireless terminal 30 during the period from the current time to a predetermined time.
  • ⁇ is a constant that determines the prediction range of stochastic diffusion. In this embodiment, ⁇ is 2. However, ⁇ may be a value smaller than 2 or a value larger than 2.
  • the difference value between CQI + T and CQI ⁇ T which is the stochastic diffusion of CQI, is a value obtained by multiplying 2 ⁇ ⁇ ⁇ ⁇ “square root of T” and CQI variance ⁇ by a predetermined value from Equation (14). Since it is calculated, it is also a variation amount of CQI at time T.
  • the wireless channel transmission rate prediction unit 503 predicts the probabilistic spread of the future wireless channel transmission rate using Equation (15) (step S502).
  • Equation (15) R + T is the best value of the radio channel transmission rate expected at the future time T, and R ⁇ T is the worst value of the radio channel transmission rate expected at the future time T. is there.
  • the difference value between R + T and R ⁇ T calculated from Equation (15) is the stochastic spread of the radio channel transmission rate at time T.
  • the predicted CQI calculated from the equation (14) is not an integer, as shown in FIG.
  • the wireless line transmission rate from the current time to 10 [seconds] later is predicted every 0.1 [seconds].
  • the predicted wireless line transmission rate may be a wireless line transmission rate up to a time before 10 [seconds] from the current time, or a wireless up to a time after 10 [seconds] from the current time.
  • the line transmission rate may be used.
  • the period of the predicted wireless line transmission rate may be a period shorter than 0.1 [seconds] or may be a period longer than 0.1 [seconds].
  • the difference value between R + T and R ⁇ T which is the stochastic spread of the radio channel transmission rate, is also the amount of fluctuation of the radio channel transmission rate at time T.
  • the radio channel transmission rate prediction unit 503 performs the above processing for all the radio terminals 30 connected to the base station 50. Thereafter, the wireless line transmission rate prediction unit 503 ends the process of FIG.
  • step S201 the mathematical formula (16) is used to calculate the data amount D that can be transmitted to the wireless terminal 30 by the base station 20 before a predetermined time elapses.
  • the wireless terminal 30 that is predicted to have a large variation in the wireless channel transmission rate is more likely to have the data amount D compared to the wireless terminal 30 that is predicted to have a small variation in the wireless channel transmission rate. Becomes smaller.
  • the radio terminal 30 that is predicted to have a large fluctuation in the radio line transmission rate has a high possibility that the communication speed in the radio section is rapidly deteriorated. Therefore, with the data amount D calculated with the best value R + T , the amount of data stored in the wireless terminal 30 stored in the buffer 202 of the base station 50 may increase. Therefore, an increase in the accumulated data amount is avoided by reducing the data amount D of the wireless terminal 30.
  • equation (17) may be used to calculate the data amount D that can be transmitted to the wireless terminal 30 by the base station 20 before a predetermined time has elapsed.
  • the wireless terminal 30 that is predicted to have a large variation in the wireless channel transmission rate is more likely to have the data amount D compared to the wireless terminal 30 that is predicted to have a small variation in the wireless channel transmission rate.
  • the radio terminal 30 that is predicted to have a large fluctuation in the radio line transmission rate has a high possibility that the communication speed in the radio section will be drastically improved. Therefore, with the data amount D calculated with the worst value R ⁇ T , the stored data amount of the wireless terminal 30 stored in the buffer 202 of the base station 50 may be exhausted. Therefore, depletion of the stored data amount can be avoided by increasing the data amount D of the wireless terminal 30.
  • the operation procedure in the wired line transmission rate supervision unit 504 may be the same as that of the wired line transmission rate supervision unit 204 of the base station 20 in the first example of the first embodiment shown in FIG. Alternatively, it may be the same as the wired line transmission rate supervision unit 204 of the base station 20 in the first example of the first embodiment shown in FIG.
  • the data amount D used for calculating the upper threshold Thresh High of the accumulated data amount of the wireless terminal 30 accumulated in the buffer 202 of the base station 50 may be a value calculated from Equation (16), or Or a value calculated from Equation (17).
  • the data amount D used for the calculation of the lower limit threshold Thresh Low of the stored data amount may be the same formula as the derivation formula of the data amount D used for the calculation of the upper limit threshold Thresh High of the stored data amount, or a different formula It is good.
  • the amount of change in the future radio channel transmission rate between the base station 50 and the radio terminal 30 connected to the base station 50 is also predicted. Since the predicted fluctuation amount of the wireless line transmission rate can also be used, the wired line transmission rate of the data addressed to the wireless terminal 30 transferred from the traffic management device 10 to the base station 20 via the core network can be controlled. Compared with the first embodiment of the invention, it is possible to avoid an increase or depletion of the stored data amount of the wireless terminal 30 stored in the buffer 202 of the base station 50.
  • the radio channel transmission rate prediction unit 203 of the base station 20 predicts the probabilistic spread of CQI as a change trend based on the current and past values of the quality information of the radio channel. It is not limited. For example, instead of CQI, SINR, RSRP, or RSRQ stochastic spread may be predicted. Further, the stochastic spread with respect to the number of wireless terminals 30 to which the data stored in the buffer 202 should be transmitted may be predicted. Alternatively, the stochastic spread of the throughput (communication speed) of the radio section may be predicted.
  • the functions provided in the radio channel transmission rate prediction unit 503 of the base station 50 can also be used in the first embodiment.
  • step S201 the best value R + T of the wireless channel transmission rate expected at a future time T is used, and the data amount D that can be transmitted to the wireless terminal 30 by the base station 20 before the elapse of a predetermined time is obtained. You may calculate. Alternatively, the data amount D may be calculated using the worst value R ⁇ T of the transmission rate. Alternatively, an average value of R + T and R ⁇ T may be used.
  • the derivation formula for the quantity D may be the same formula or a different formula.
  • Formula (1), Formula (6), Formula (7), and Formula (14) are only examples of the future change tendency of the quality information of the radio channel predicted by the radio channel transmission rate prediction unit 203.
  • the prediction of the future value of the wireless line transmission rate and the instruction of the control method of the wired line transmission rate of the traffic management apparatus are performed on the base station side, but the present invention is not limited to this.
  • these processes may be performed on the traffic management apparatus side.
  • the traffic management device it can be realized by using the traffic management device as a data transmission control device and acquiring the quality information of the radio channel from the base station at an arbitrary timing.
  • the data transmission control apparatus should just have the following structure. That is.
  • the data transmission control device includes receiving means for receiving data addressed to a wireless terminal via a network, and a buffer for storing data addressed to the wireless terminal, and the data stored in the buffer is wirelessly connected to the wireless terminal.
  • Predicting means for predicting a future value of a radio channel transmission rate for transmitting the data from the base station to the radio terminal, a future value of the radio channel transmission rate, and an accumulated data amount stored in the buffer And a control means for controlling a wire transmission rate for transmitting data addressed to the wireless terminal to the base station by the transmitting means.
  • the above-described embodiment can also be implemented by a base station management device or OAM (Operation and Management) provided above the base station.
  • OAM Operaation and Management
  • the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention already described.
  • the transmission rate of the wired line between the relay device and the wireless base station is controlled based on the quality information and the transmission rate of the wireless line between the wireless base station and the wireless terminal. It can be said that there is one of the features in. Therefore, when the above-described data transmission control device is a base station, as a configuration for carrying out the present invention, at least one of quality information and a transmission rate of a radio channel between the radio base station and the radio terminal is acquired.
  • Control information for controlling the transmission rate of the wired line between the acquisition unit, the relay device, and the wireless base station is determined based on the quality information of the wireless line or the change tendency of the transmission rate, and the wired line It is only necessary to include a control unit that notifies the relay device that controls the transmission rate.
  • the data transmission control apparatus as a radio base station may have a function unit that causes the data transmission control apparatus to operate as a radio base station in a general radio communication system.
  • the data transmission control device described above is a traffic management device
  • an acquisition unit that acquires at least one of quality information and a transmission rate of a wireless channel between the wireless base station and the wireless terminal from the wireless base station
  • a control unit that controls the transmission rate of the wired line with the wireless base station based on the quality information of the wireless line or the change tendency of the transmission rate may be provided.
  • the traffic management device is a node (for example, P-GW) installed in the core network
  • the data transmission control device operates as a node such as P-GW in a general wireless communication system.
  • the present invention has been described as a hardware configuration, but the present invention is not limited to this.
  • the present invention can also realize arbitrary processing by causing a CPU (Central Processing Unit) to execute a computer program.
  • a CPU Central Processing Unit
  • Non-transitory computer readable media include various types of tangible storage media (tangible storage medium).
  • Examples of non-transitory computer-readable media include magnetic recording media (eg flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg magneto-optical discs), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W, DVD (Digital Versatile Disc), BD (Blu-ray (registered trademark) Disc), semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM ( Random Access Memory)).
  • magnetic recording media eg flexible disks, magnetic tapes, hard disk drives
  • magneto-optical recording media eg magneto-optical discs
  • CD-ROMs Read Only Memory
  • CD-Rs Compact Only Memory
  • CD-R / W Digital Versatile Disc
  • DVD Digital Versatile Disc
  • BD Blu-ray (registered trademark) Disc
  • the program may also be supplied to the computer by various types of temporary computer-readable media.
  • Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves.
  • the temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.
  • (Appendix 1) Send the data addressed to the wireless terminal received via the network from the relay device to the base station via a wired line, A data transmission control method for transmitting data stored in the buffer to the wireless terminal via a wireless line after storing the data received by the base station in a buffer, Prediction predicting a future change trend of the quality information of the radio channel and predicting a future value of a radio channel transmission rate for transmitting the data from the base station to the radio terminal based on the predicted change trend Steps, Based on the future value of the wireless channel transmission rate and the amount of data stored in the buffer, control of the wired channel transmission rate for transmitting data addressed to the wireless terminal from the relay device to the base station is performed.
  • the control step includes The wired line transmission rate is controlled so that a data amount satisfying a future value of the wireless line transmission rate can be stored in the buffer.
  • the data transmission control method according to supplementary note 1, wherein: (Appendix 3)
  • the control step includes The wired line transmission rate is controlled so that the amount of data stored in the buffer decreases as the wireless terminal has a larger fluctuation amount of the future value of the wireless line transmission rate.
  • the data transmission control method according to appendix 1 or 2 characterized in that.
  • the control step includes When the accumulated data amount is larger than the upper limit threshold of the accumulated data amount calculated using the future value of the wireless line transmission rate, the control is performed so as to decrease the wired line transmission rate. 4.
  • the data transmission control method according to any one of supplementary notes 1 to 3, characterized in that: (Appendix 5)
  • the upper threshold value of the stored data is calculated using the amount of data that can be transmitted by the wireless line transmission rate until a predetermined time has elapsed.
  • the data transmission control method includes If the accumulated data amount is smaller than the lower limit threshold of the accumulated data amount, which is smaller than the upper limit threshold of the accumulated data amount calculated using the future value of the wireless line transmission rate, the wired line transmission rate is increased.
  • the data transmission control method includes Based on the future change trend, at least one of the future channel quality between the base station and the wireless terminal, or the number of the wireless terminals to which the data stored in the buffer is to be transmitted To calculate Predicting the future value of the wireless channel transmission rate using the future channel quality and the number of wireless terminals; 8.
  • the data transmission control method according to any one of appendices 1 to 7, characterized in that: (Appendix 9) The channel quality is Including at least one of CQI (Channel Quality Indicator), RSRP (Reference Signal Received Power), or RSRQ (Reference Signal Received Quality), The data transmission control method according to supplementary note 8, wherein (Appendix 10) The data transmission control method according to appendix 8, wherein a theoretical limit value of the channel quality is used as a future channel quality between the base station and the wireless terminal. (Appendix 11) The prediction step includes Predicting the future throughput between the base station and the wireless terminal, and setting the predicted throughput as the future value of the wireless line transmission rate; 8.
  • the data transmission control method is Including at least one of PDCP (Packet Data Convergence Protocol) throughput, RLC (Radio Link Control) throughput, MAC (Medium Access Control) throughput, or OTA (Over-The-Air) throughput,
  • the data transmission control method according to supplementary note 11, characterized by: (Appendix 13)
  • the prediction step includes A future value of a round trip delay time (RTT; Round Trip Time) between the relay device and the wireless terminal is predicted, and a throughput converted from the predicted round trip delay time is set as a future value of the wireless line transmission rate.
  • RTT Round Trip Time
  • the data transmission control method includes Controlling the wired line transmission rate for each wireless terminal; 14.
  • the data transmission control method includes Controlling the wired line transmission rate for each TCP (Transmission Control Protocol) flow.
  • the data transmission control method includes Controlling the wired line transmission rate in application protocol units; 14.
  • the data transmission control method according to any one of appendices 1 to 13, characterized in that: (Appendix 18) A relay device that transmits data addressed to a wireless terminal received via a network toward the wireless terminal via a wired line; After storing the data received from the relay device in a buffer, a base station that transmits the data stored in the buffer to the wireless terminal via a wireless line; With The base station Predicting a future change trend of the quality information of the radio channel, and predicting a future value of a radio channel transmission rate for transmitting the data from the base station to the radio terminal based on the predicted change trend, The relay device is Based on the future value of the wireless channel transmission rate and the amount of data stored in the buffer, control of the wired channel transmission rate for transmitting data addressed to the wireless terminal from the relay device to the base station is performed.
  • (Appendix 21) Receiving means for receiving data addressed to the wireless terminal via the network; A buffer for storing data addressed to the wireless terminal; and transmitting the received data via a wired line to a base station that transmits the data stored in the buffer to the wireless terminal via a wireless line
  • Sending means to Prediction predicting a future change trend of the quality information of the radio channel and predicting a future value of a radio channel transmission rate for transmitting the data from the base station to the radio terminal based on the predicted change trend Means, Based on the future value of the wireless line transmission rate and the amount of stored data stored in the buffer, the transmission means controls the wired line transmission rate for transmitting data addressed to the wireless terminal to the base station.
  • Control means to perform A data transmission control device comprising: (Appendix 22) A reception process for receiving data addressed to the wireless terminal via the network; A buffer for storing data addressed to the wireless terminal; and transmitting the received data via a wired line to a base station that transmits the data stored in the buffer to the wireless terminal via a wireless line Send processing to Prediction predicting a future change trend of the quality information of the radio channel and predicting a future value of a radio channel transmission rate for transmitting the data from the base station to the radio terminal based on the predicted change trend Processing, Based on the future value of the wireless line transmission rate and the amount of stored data stored in the buffer, control of the wired line transmission rate for transmitting data addressed to the wireless terminal to the base station by the transmission process is performed.
  • a data transmission control program for causing a computer to execute.
  • Appendix A1 A data transmission control device for receiving data addressed to the wireless terminal to be transmitted to a wireless terminal via a wireless base station from a relay device provided at a higher level of the wireless base station, Obtaining means for obtaining at least one of quality information and a transmission rate of a wireless channel between the wireless base station and the wireless terminal; Information for controlling the transmission rate of the wired line between the relay device and the wireless base station is determined based on the quality information of the wireless line or a change tendency of the transmission rate, and the transmission rate of the wired line is controlled.
  • a data transmission control device comprising: control means for notifying the relay device.
  • Appendix A2 The data transmission control device according to Appendix A1, which is the radio base station.
  • Appendix A3 The data transmission control device according to appendix A1 or A2, which notifies the relay device of an instruction to increase or decrease the transmission rate of the wired line according to the quality information of the wireless line or a change tendency of the transmission rate.
  • Appendix A4 A prediction unit that predicts at least a future value of the transmission rate of the wireless channel using the quality information of the wireless channel or a change tendency of the transmission rate; The data transmission control according to any one of appendices A1 to A3, wherein the control means determines information for controlling the transmission rate of the wired line based on the predicted future value of the transmission rate of the wireless line. apparatus.
  • (Appendix A5) A buffer for storing the data addressed to the received wireless terminal; The data according to appendix A4, wherein the control means determines information for controlling the transmission rate of the wired line based on a future value of the transmission rate of the wireless line and a stored data amount stored in the buffer.
  • Transmission control device. (Appendix A6) The acquisition of the transmission rate of the wireless channel by the acquisition means is calculated based on at least one of a data amount that can be transmitted per unit time between the wireless base station and the wireless terminal or an index representing the data amount.
  • the data transmission control device according to any one of appendices A1 to A5, which is performed by: (Appendix A7) A data transmission control apparatus control method for receiving data addressed to a radio terminal to be transmitted to a radio terminal via a radio base station from a relay apparatus provided at a higher level of the radio base station, Obtaining at least one of quality information and transmission rate of a radio channel between the radio base station and the radio terminal; Information for controlling the transmission rate of the wired line between the relay device and the wireless base station is determined based on the quality information of the wireless line or a change tendency of the transmission rate, and the transmission rate of the wired line is controlled. A method of controlling a data transmission control device that notifies the relay device.
  • a data transmission control apparatus that communicates with a radio base station that transmits data addressed to a radio terminal to the radio terminal, Acquisition means for acquiring at least one of quality information and a transmission rate of a radio channel between the radio base station and the radio terminal from the radio base station;
  • a data transmission control device comprising: control means for controlling a transmission rate of a wired line with the wireless base station based on quality information of the wireless line or a change tendency of the transmission rate.
  • Appendix A9 A control method of a data transmission control apparatus that communicates with a radio base station that transmits data addressed to a radio terminal, Obtaining at least one of quality information and transmission rate of a radio channel between the radio base station and the radio terminal; A control method of a data transmission control device for controlling a transmission rate of a wired line with the wireless base station based on quality information of the wireless line or a change tendency of the transmission rate.
  • Appendix A10 A program that causes a computer to execute the control method of the data transmission control device according to attachment A7 or A9.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention permet d'éviter des baisses de rendement TCP et d'améliorer la qualité d'expérience des utilisateurs. Le dispositif de commande de transmission de données selon la présente invention reçoit, d'un dispositif relais disposé sur un niveau supérieur à celui d'une station de base sans fil, des données adressées à un terminal sans fil, qui doivent être transmises au terminal sans fil par la station de base sans fil. Le dispositif de commande de transmission de données comprend un moyen d'acquisition pour acquérir au moins des informations de qualité et/ou le débit de transmission d'un canal sans fil entre la station de base sans fil et le terminal sans fil, et un moyen de commande pour déterminer des informations afin de commander le débit de transmission d'une ligne filaire entre le dispositif relais et la station de base sans fil, sur la base de la tendance de variation des informations de qualité ou du débit de transmission du canal sans fil, et informer le dispositif relais commandant le débit de transmission de la ligne filaire.
PCT/JP2015/002235 2014-09-19 2015-04-24 Dispositif et procédé de commande de transmission de données WO2016042686A1 (fr)

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Cited By (1)

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WO2019017298A1 (fr) * 2017-07-19 2019-01-24 日本電気株式会社 Dispositif, système et procédé de distribution de données et support d'enregistrement

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JP2000286851A (ja) * 1999-03-31 2000-10-13 Hitachi Ltd 通信制御装置
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JP2000286851A (ja) * 1999-03-31 2000-10-13 Hitachi Ltd 通信制御装置
JP2006295842A (ja) * 2005-04-14 2006-10-26 Mitsubishi Electric Corp 基地局装置
JP2009272761A (ja) * 2008-05-01 2009-11-19 Ntt Docomo Inc 無線基地局及び移動通信方法
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019017298A1 (fr) * 2017-07-19 2019-01-24 日本電気株式会社 Dispositif, système et procédé de distribution de données et support d'enregistrement
JPWO2019017298A1 (ja) * 2017-07-19 2020-04-23 日本電気株式会社 データ配信装置、システム、方法および記録媒体
US11509917B2 (en) 2017-07-19 2022-11-22 Nec Corporation Data delivery device, system, method, and recording medium

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