WO2019146563A1 - Dispositif de communication, système de communication, procédé de communication, et programme - Google Patents

Dispositif de communication, système de communication, procédé de communication, et programme Download PDF

Info

Publication number
WO2019146563A1
WO2019146563A1 PCT/JP2019/001756 JP2019001756W WO2019146563A1 WO 2019146563 A1 WO2019146563 A1 WO 2019146563A1 JP 2019001756 W JP2019001756 W JP 2019001756W WO 2019146563 A1 WO2019146563 A1 WO 2019146563A1
Authority
WO
WIPO (PCT)
Prior art keywords
data
time
base station
transmission
amount
Prior art date
Application number
PCT/JP2019/001756
Other languages
English (en)
Japanese (ja)
Inventor
譚生 李
健夫 大西
信清　貴宏
Original Assignee
日本電気株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電気株式会社 filed Critical 日本電気株式会社
Priority to JP2019567068A priority Critical patent/JP6973511B2/ja
Publication of WO2019146563A1 publication Critical patent/WO2019146563A1/fr

Links

Images

Classifications

    • 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

Definitions

  • the present invention is based on the priority claim of Japanese Patent Application: Japanese Patent Application No. 2018-010571 (filed on January 25, 2018), the entire contents of the application being incorporated herein by reference. It shall be.
  • the present invention relates to a communication apparatus, a communication system, a communication method, and a program.
  • CA Carrier aggregation
  • LTE Long Term Evolution
  • CA is a technology for realizing high-speed mobile communication as compared to the case of a single CC by simultaneously and simultaneously using a plurality of frequency lines called component carriers (CCs).
  • CCs component carriers
  • the communication performance may not be maximized. This is because the communication device on the Internet side that controls the transport layer independently of the data link layer of the base station can not grasp the situation of the base station.
  • TCP Transmission Control Protocol
  • TCP Transmission Control Protocol
  • TCP Transmission Control Protocol
  • the base station when transmitting data to the terminal, stores data to be transmitted in the transmission buffer of the base station.
  • the transmission buffer of the base station is a storage area of the base station itself.
  • the base station has to stop transmission.
  • the communication apparatus on the Internet side can not complete data transmission to the base station.
  • the wireless resources transmitted from the communication apparatus on the Internet side are wasted. Therefore, if the transmission buffer of the base station becomes empty during data transmission from the communication apparatus on the Internet side, the time required for data transmission becomes large and the throughput which is the end-to-end communication speed becomes small.
  • the bandwidth of the path between the communication apparatus on the transmitting side and the communication apparatus on the receiving side is wide band, and the path is long and RTT (Round Trip Time) is large (referred to as high delay).
  • a technology such as a communication device capable of improving the throughput.
  • the communication device transitions from the first state to the second state.
  • the first state is a state in which the transmission window size is a window size (first window size) which does not exceed the reception window size.
  • the second state is a state in which the transmission window size is a window size (second window size) exceeding the reception window size.
  • the communication device of Patent Document 1 transmits a packet whose size exceeds the reception window size.
  • the transmitting apparatus of Patent Document 1 can improve end-to-end throughput by transmitting data exceeding the transmittable maximum data amount notified from the receiving side.
  • a transmission error detection method and a retransmission control method are defined.
  • a method of detecting an error when transmission failure occurs in a lower layer is defined.
  • a method is defined to control retransmission by preventing completion of upper layer communication until retransmission success.
  • a method is also defined in which a subsequent packet waits until retransmission is completed to control retransmission.
  • the terminal device on the transmitting side transmits data to the terminal device on the receiving side via the base station using the TCP protocol.
  • FIG. 2 is a block diagram showing an example of the protocol configuration of the base station 103 and an example of the protocol configuration of the terminal apparatus.
  • the base station 103 is 3GPP Rel. With a general configuration of 10 or later. Specifically, the base station 103 includes a base station PDCP (Packet Data Convergence Protocol) layer 1031, a base station RLC (Radio Link Control) layer 1032, one or more MAC (Media Access Control) layers, Or two or more physical layers.
  • the base station PDCP layer 1031 is a PDCP layer of the base station 103.
  • the base station RLC layer 1032 is an RLC layer of the base station 103.
  • FIG. 2 in order to clarify the relationship between the base station 103 and the terminal device, the description of the configuration other than the U-Plane protocol of the base station 103 is omitted.
  • FIG. 2 shows two MAC layers (base station MAC layers 1033a and 1033b) of the base station 103, this does not mean that the number of MAC layers of the base station 103 is limited to two.
  • two physical layers (base station physical layers 1034 a and 1034 b) of the base station 103 are shown in FIG. 2, this is not intended to limit the number of physical layers of the base station 103 to two.
  • the MAC layers of the base station 103 will be referred to as a base station MAC layer 1033 if it is not necessary to distinguish them.
  • the physical layers of the base station 103 will be referred to as a base station physical layer 1034 unless it is necessary to distinguish them.
  • the terminal device communication unit 121 which is a communication unit of the terminal device, performs 3GPP Rel. With a general configuration of 10 or later.
  • the terminal device communication unit 121 includes a terminal transport layer 1210, a terminal PDCP layer 1211, a terminal RLC layer 1212, one or more MAC layers, and one or more physical layers.
  • the terminal transport layer 1210 is a transport layer of the terminal device.
  • the terminal PDCP layer 1211 is a PDCP layer of the terminal device.
  • the terminal RLC layer 1212 is an RLC layer of the terminal apparatus.
  • terminal MAC layers 1213 a and 1213 b are shown in FIG. 2, this is not intended to limit the number of MAC layers of the terminal device to two.
  • terminal physical layers 1214 a and 1214 b two physical layers (terminal physical layers 1214 a and 1214 b) of the terminal device are shown, but this does not mean that the number of physical layers of the terminal device is limited to two.
  • the terminal MAC layer 1213 when it is not necessary to distinguish between the MAC layers of the terminal devices, they will be denoted as the terminal MAC layer 1213.
  • the physical layer of the terminal device is described as a terminal physical layer 1214 if it is not necessary to distinguish each other.
  • the base station RLC layer 1032 is connected to at least one base station MAC layer 1033. Also, the RLC layer (terminal RLC layer 1212) of the terminal apparatus is connected to at least one MAC layer (terminal MAC layer 1213).
  • the terminal MAC layer 1213 When the base station MAC layer 1033 completes transmitting data to the terminal MAC layer 1213, the terminal MAC layer 1213 transmits data of transmission completion to the terminal RLC layer 1212. At the same time, the terminal MAC layer 1213 transmits a transmission completion notification to the base station MAC layer 1033. Thereafter, the terminal RLC layer 1212 notifies the base station RLC layer 1032 that the data has been received normally.
  • the terminal MAC layer 1213 can not transmit data to the terminal RLC layer 1212. Therefore, when a transmission error occurs between the base station MAC layer 1033 and the terminal MAC layer 1213, the terminal MAC layer 1213 can not transfer data to the terminal RLC layer and the terminal PDCP layer 1211 above it.
  • the arrival order of data is guaranteed (RLC ACK (Acknowledgement) mode). Therefore, when a packet is retransmitted between the base station RLC layer 1032 and the terminal RLC layer 1212, the subsequent packet is received until the reception of the retransmitted packet is completed even if the subsequent packet normally arrives at the terminal RLC layer 1212. Is not transferred to the terminal PDCP layer 1211. Furthermore, no data is transferred to the terminal transport layer 1210 above the terminal PDCP layer 1211. Therefore, the terminal transport layer 1210 can not transmit a notification (ACK) indicating that data has been received to the TCP transmission apparatus.
  • ACK notification
  • the transmitting device can add new data unless it receives a transmission completion notification (ACK) from the terminal transport layer 1210. Do not send Therefore, when a packet between the base station RLC layer 1032 and the terminal RLC layer 1212 is retransmitted, the subsequent data is not transmitted until the transmitting apparatus receives the ACK packet.
  • ACK transmission completion notification
  • a fault occurs between the terminal transport layer 1210 and the base station RLC layer 1032 of the terminal apparatus on the transmission side. If a fault occurs between the terminal transport layer 1210 of the transmitting terminal and the base station RLC layer 1032, the terminal transport layer 1210 of the transmitting terminal receives an ACK when an RLC retransmission occurs. I can not send new data. As a result, the amount of data stored in the buffer of the base station 103 (hereinafter referred to as the transmission buffer of the base station 103) decreases and is exhausted. In order to avoid this, a method has been proposed in which the base station 103 notifies the terminal device on the transmission side of the buffer status [Patent Document 2] implements a function that can notify the base station of the buffer status.
  • the timing of additional transmission of data is determined using a change in the relationship between the TCP congestion window size in the communication apparatus and the reception window size notified by the terminal by the TCP ACK.
  • the communication apparatus described in Patent Document 1 can not detect that the data in the buffer of the base station has decreased to 0 even when observing changes in the congestion window size and the reception window size.
  • the communication device described in Patent Document 1 can not additionally transmit data, which may cause deterioration in communication speed.
  • a method may be considered in which additional transmission processing of data is performed simply by the increase in communication delay.
  • the communication apparatus can not appropriately set the timing for starting the additional transmission process of data and the amount of data to be additionally transmitted.
  • the amount of data for additional transmission becomes too small, communication speed degradation may occur due to the data in the base station buffer becoming zero. On the other hand, if the amount of data for additional transmission becomes excessive, the amount of data exceeding the wireless transmission capacity may be transmitted, which may cause deterioration of communication quality due to increased packet loss and communication delay.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a communication apparatus, a communication system, a communication method, and a program that contribute to preventing deterioration of communication speed.
  • a communication device transmits data to a terminal apparatus via a base station.
  • the communication device includes a response signal receiving unit that receives a confirmation response from the terminal device. Furthermore, the wireless communication speed between the base station and the terminal apparatus is calculated, and the amount of data staying in the transmission buffer of the base station is calculated as the amount of staying data, and the wireless communication rate, the amount of staying data, and A buffer status estimation unit is provided that predicts the fluctuation of the amount of stagnant data based on the acknowledgment response reception time.
  • the communication device includes a transmission time calculation unit that calculates a time at which new data is transmitted to the terminal device as an additional transmission time based on the fluctuation predicted by the buffer status estimation unit.
  • the communication device includes a new data transmission unit that transmits the new data to the terminal device at a predetermined transmission rate on condition that at least the additional transmission time has passed.
  • a communication system includes a terminal device, a base station, and a communication device.
  • the terminal device includes a terminal device communication unit connected to a network.
  • the base station includes a transmission buffer that stores data to be transmitted to the terminal device.
  • the communication apparatus transmits data to the terminal apparatus via the base station.
  • the communication device includes a response signal receiving unit that receives a confirmation response from the terminal device.
  • the communication apparatus calculates a wireless communication speed between the base station and the terminal apparatus, calculates an amount of data accumulated in a transmission buffer of the base station as an accumulated data amount, and calculates the wireless communication speed and the wireless communication speed
  • a buffer status estimation unit is provided which predicts the fluctuation of the amount of stagnant data based on the amount of stagnant data and the reception time of the confirmation response.
  • the communication device includes a transmission time calculation unit that calculates a time at which new data is transmitted to the terminal device as an additional transmission time based on the fluctuation predicted by the buffer status estimation unit.
  • the communication device includes a new data transmission unit that transmits the new data to the terminal device at a predetermined transmission rate on condition that at least the additional transmission time has passed.
  • a communication method includes the step of receiving a confirmation response from a terminal device. Further, the communication method includes the step of calculating a wireless communication speed between the base station and the terminal device. Furthermore, the communication method includes the step of calculating the amount of data staying in the transmission buffer of the base station as the amount of staying data. Furthermore, the communication method includes the step of predicting a change in the amount of stagnant data based on the wireless communication speed, the amount of stagnant data, and the reception time of the acknowledgment. Furthermore, the communication method includes the step of calculating, as an additional transmission time, a time at which new data is transmitted to the terminal device based on the fluctuation.
  • the communication method includes the step of transmitting the new data to the terminal device at a predetermined transmission rate, at least when the additional transmission time has passed.
  • the method is tied to a particular machine, a communication device that transmits data to the terminal via the base station.
  • a program is provided.
  • the program is a program that is executed by a computer that controls a communication apparatus that transmits data to a terminal apparatus via a base station.
  • the program causes the computer to execute a process of receiving a confirmation response from the terminal device.
  • the communication method causes the computer to execute a process of calculating a wireless communication speed between the base station and the terminal device.
  • the communication method causes the computer to execute a process of calculating the amount of data staying in the transmission buffer of the base station as the amount of staying data.
  • the program causes the computer to execute a process of predicting a change in the amount of stagnant data based on the wireless communication speed, the amount of stagnant data, and the reception time of the confirmation response.
  • the program causes the computer to execute a process of calculating, as an additional transmission time, a time to transmit new data to the terminal device based on the fluctuation.
  • the program causes the computer to execute the process of transmitting the new data to the terminal device at a predetermined transmission rate on condition that at least the additional transmission time has passed.
  • the program can be recorded on a computer readable storage medium.
  • the storage medium can be non-transient such as a semiconductor memory, a hard disk, a magnetic recording medium, an optical recording medium, and the like.
  • the invention can also be embodied as a computer program product.
  • a communication device a communication system, a communication method, and a program that contribute to preventing deterioration of communication speed are provided.
  • FIG. 1 is a diagram illustrating an example of an entire configuration of a wireless communication system according to a first embodiment. It is a block diagram which shows an example of the hardware constitutions of the communication apparatus 11 which concerns on 1st Embodiment. It is a block diagram which shows an example of the hardware constitutions of the terminal device 12 which concerns on 1st Embodiment. It is a block diagram showing an example of composition of communication apparatus 11 concerning a 1st embodiment. 5 is a block diagram showing an example of the configuration of a response signal receiving unit 111.
  • FIG. 1 is a diagram illustrating an example of an entire configuration of a wireless communication system according to a first embodiment. It is a block diagram which shows an example of the hardware constitutions of the communication apparatus 11 which concerns on 1st Embodiment. It is a block diagram which shows an example of the hardware constitutions of the terminal device 12 which concerns on 1st Embodiment. It is a block diagram showing an example of composition of communication apparatus 11 concerning a 1st embodiment.
  • 5 is
  • connection lines between blocks in each block diagram include both bidirectional and unidirectional directions.
  • the unidirectional arrows schematically indicate the flow of main signals (data), and do not exclude bidirectionality.
  • input ports and output ports are respectively present at the input end and the output end of each connection line, although they are not explicitly shown. The same is true for the input / output interface.
  • the communication apparatus 1 shown in FIG. 1 transmits data to a terminal apparatus via a base station.
  • the communication device 1 includes a response signal receiving unit 2, a buffer status estimating unit 3, a transmission time calculating unit 4, and a new data transmitting unit 5.
  • the response signal receiving unit 2 receives a confirmation response from the terminal device.
  • the buffer status estimation unit 3 calculates the wireless communication speed between the base station and the terminal device, calculates the amount of data being transmitted by the base station as the amount of stagnant data, and receives the wireless communication speed, the amount of stagnant data, and the acknowledgment.
  • the fluctuation of the amount of staying data is predicted based on the time of day.
  • the transmission time calculation unit 4 calculates, as an additional transmission time, the time at which new data is transmitted to the terminal apparatus based on the change in the stagnant data of the base station predicted by the buffer status estimation unit 3.
  • the transmission process of additional data is also referred to as an additional transmission process.
  • the new data transmission unit 5 transmits the new data to the terminal apparatus at a predetermined transmission rate on condition that at least the additional transmission time has passed.
  • the communication device 1 determines the timing for transmitting new data after taking into consideration the amount of stagnated data of the base station, with the case that at least the additional transmission time has passed as a necessary condition. Therefore, the communication device 1 contributes to preventing the transmission buffer of the base station from becoming empty. As a result, the communication device 1 contributes to the prevention of impossibility of transmitting new data in the wireless layer. Therefore, the communication device 1 contributes to preventing the deterioration of the communication speed.
  • FIG. 3 is a diagram illustrating an example of the entire configuration of the wireless communication system according to the first embodiment.
  • the wireless communication system includes networks 101-1 to 101-n (n is a natural number, hereinafter the same).
  • the networks 101-1 to 101-n include communication types (wired and wireless) of different end terminals.
  • the networks 101-1 to 101-n are, for example, a LTE public cellular phone network, home Wi-Fi (Wireless Fidelity) (registered trademark, the same applies hereinafter), a LAN (Local Area Network) in a building, and the like.
  • the networks 101-1 and 101-2 are mobile networks.
  • the terminal device 12-1 connects to the network 101-1 via the base station 103-1.
  • the terminal device 12-2 connects to the network 101-2 via the base station 103-2.
  • the terminal devices 12-1 and 12-2 will be denoted as the terminal device 12 if it is not necessary to distinguish them.
  • the base stations 103-1 and 103-2 will be referred to as a base station 103, if it is not necessary to distinguish them.
  • the networks 101-1 to 101-n will be referred to as the network 101 if it is not necessary to distinguish them.
  • the terminal device 12 accesses the server 105 on the Internet 104 via the corresponding network 101 to perform data communication.
  • the communication apparatus 11 of the present invention is not applied only to the terminal apparatus 12 using the LTE network, but also supports terminals using other wireless communication formats.
  • the terminal device 12 may communicate with the communication device 11 via the Wi-Fi relay station.
  • the terminal device 12 will be described by exemplifying the case of using the LTE network. However, this is not the meaning limited to the case where the terminal device 12 according to the present embodiment uses the LTE network.
  • the case where the communication apparatus 11 is installed on the connection between the network 101 and the Internet 104 on the communication path is taken as an example.
  • the installation place of the communication device 11 is not limited to the connection portion of the mobile network and the Internet, and may be a device on another communication path other than the connection portion.
  • the communication device 11 may be installed in the server 105 on the communication path.
  • FIG. 4 is a block diagram showing an example of the hardware configuration of the communication apparatus 11 according to the first embodiment.
  • the communication device 11 includes, for example, the configuration illustrated in FIG.
  • the communication device 11 includes a central processing unit (CPU) 81, a memory 82, an input / output interface 83, and a network interface card (NIC) 84 as communication means, which are mutually connected by an internal bus.
  • CPU central processing unit
  • memory a memory
  • input / output interface a network interface card
  • NIC network interface card
  • the configuration shown in FIG. 4 does not mean that the hardware configuration of the communication apparatus 11 is limited.
  • the communication device 11 may include hardware (not shown), and may not have the input / output interface 83 as necessary. Further, the number of CPUs and the like included in the communication device 11 is not limited to the example illustrated in FIG. 4. For example, the communication device 11 may include a plurality of CPUs.
  • the memory 82 is a random access memory (RAM), a read only memory (ROM), or an auxiliary storage device (such as a hard disk).
  • RAM random access memory
  • ROM read only memory
  • auxiliary storage device such as a hard disk
  • the input / output interface 83 functions as an interface of a display device and an input device (not shown).
  • the display device is, for example, a liquid crystal display or the like.
  • the input device receives user operations such as a keyboard and a mouse, for example.
  • the function of the communication device 11 is realized by various processing modules described later.
  • the processing module is realized, for example, by the CPU 81 executing a program stored in the memory 82. Also, the program can be downloaded via a network or can be updated using a storage medium storing the program. Furthermore, the processing module may be realized by a semiconductor chip. That is, the communication device 11 is configured to include means for performing the function performed by the processing module with some hardware and / or software.
  • the terminal device 12 has, for example, the configuration illustrated in FIG.
  • the terminal device 12 is configured to include an RF (Radio Frequency) circuit 94 including an antenna 95.
  • the RF circuit 94 is a circuit for realizing wireless communication, and exchanges a wireless signal with the base station 103 through the antenna 95.
  • the description of hardware common to the communication device 11 is omitted.
  • the hardware configuration of the base station 103 is apparent to those skilled in the art, and thus the description thereof is omitted.
  • processing configurations (processing modules) of the communication device 11 and the terminal device 12 will be described.
  • FIG. 6 is a block diagram showing a configuration example of a system including the communication device 11, the terminal device 12, and the network 101.
  • the terminal device 12 is configured to include a terminal device communication unit 121.
  • the network 101 is configured to include a base station 103.
  • the communication device 11 is configured to include a response signal receiving unit 111, a buffer status estimation unit 112, a transmission time calculation unit 113, and a new data transmission unit 114.
  • the terminal device communication unit 121 of the terminal device 12 is communicably connected to the base station 103 of the network 101.
  • the network 101 is communicably connected to the response signal receiving unit 111 of the communication device 11.
  • the response signal reception unit 111 is communicably connected to the buffer status estimation unit 112, the transmission time calculation unit 113, and the new data transmission unit 114.
  • the transmission time calculation unit 113 is communicably connected to the buffer status estimation unit 112 and the new data transmission unit 114.
  • the response signal receiving unit 111 receives a response signal from the terminal device 12.
  • the buffer status estimation unit 112 transmits the transmission buffer of the base station 103 based on the wireless communication speed between the base station 103 and the terminal 12, the amount of staying data in the transmission buffer of the base station 103, and the reception time of the acknowledgment. Predict fluctuations in the amount of stagnant data within
  • the transmission time calculation unit 113 calculates the additional transmission time of the new data to the terminal apparatus 12 based on the fluctuation of the amount of staying data in the transmission buffer of the base station 103.
  • the new data transmission unit 114 transmits new data to the terminal apparatus 12 at a predetermined transmission rate when at least the additional transmission time has passed.
  • FIG. 7 is a block diagram showing an example of the configuration of the response signal receiving unit 111 shown in FIG.
  • the response signal receiving unit 111 is configured to include a general configuration of an Open Systems Interconnection (OSI) reference model.
  • the response signal receiving unit 111 includes a communication device application layer 1110, a communication device transport layer 1111, a communication device network layer 1112, a communication device MAC layer 1113 and a communication device physical layer 1114.
  • FIG. 7 relates to the configuration other than the configuration related to the response signal receiving unit 111 in order to clarify the connection relationship between the buffer status estimation unit 112, the transmission time calculation unit 113, and the new data transmission unit 114. The description is omitted.
  • the buffer status estimation unit 112 calculates the buffer status of the base station 103 based on the information (for example, transmission packet, reception packet) obtained from the communication device transport layer 111 of the response signal reception unit 111. Specifically, the buffer status estimation unit 112 calculates a time at which it is estimated that the amount of staying data of the base station 103 becomes less than or equal to a predetermined threshold as a buffer depletion time. After that, the buffer status estimation unit 112 transmits the calculated buffer depletion time to the transmission time calculation unit 113.
  • the buffer status estimation unit 112 transmits the calculated buffer depletion time to the transmission time calculation unit 113.
  • the buffer status estimation unit 112 may connect to another layer (for example, the communication device application layer 1110) of the response signal reception unit 111 without limiting the connection to the communication device transport layer 1111.
  • the communication protocol based on UDP such as QUIC is because the acknowledgment signal is not transmitted to the communication device transport layer 1111 but transmitted to the communication device application layer 1110.
  • the transmission time calculation unit 113 calculates the additional transmission time based on the transmission delay between the own communication apparatus 11 and the terminal apparatus 12, the reception time of the acknowledgment, and the buffer depletion time.
  • the transmission time calculation unit 113 transmits the calculated additional transmission time to the new data transmission unit 114. Further, the transmission time calculation unit 113 calculates a transmission rate of additional transmission (hereinafter, referred to as an additional transmission rate).
  • the new data transmission unit 114 transmits the data to the terminal device 12 via the base station 103 based on the additional transmission time received from the transmission time calculation unit 113 and the additional transmission rate received from the transmission time calculation unit 113. Send.
  • FIG. 8 is a flowchart showing an example of the operation of the communication apparatus 11 according to the first embodiment.
  • the terminal device 12 starts data communication with the communication device 11.
  • the communication protocol between the communication device 11 and the terminal device 12 according to the present embodiment is a protocol having a response confirmation function.
  • the communication protocol between the communication apparatus 11 and the terminal apparatus 12 according to the present embodiment may be TCP or the like that transmits a confirmation response in the communication apparatus transport layer 1111.
  • the communication protocol between the communication apparatus 11 and the terminal apparatus 12 according to the present embodiment is not limited to the protocol for transmitting the acknowledgment in the communication apparatus transport layer 1111, but corresponds to the protocol for transmitting the acknowledgment in other layers. You may
  • the buffer status estimation unit 112 acquires the round trip delay, the in-flight data amount, the TCP throughput, and the like from the response signal reception unit 111 as communication information (step S11).
  • the amount of in-flight data means the amount of unconfirmed data successfully transmitted and successfully received in TCP.
  • the TCP throughput means the throughput in the latest predetermined time in TCP.
  • the buffer status estimation unit 112 may use, as the TCP throughput, a value obtained by dividing the total number of bits of the packet that has been completely received by the predetermined time within the latest predetermined time. Alternatively, the buffer status estimation unit 112 may calculate TCP throughput per unit time, and use the calculated average value of TCP throughput per unit time. Alternatively, the buffer status estimation unit 112 may calculate TCP throughput per unit time, and use the calculated moving average value of TCP throughput per unit time.
  • the buffer status estimation unit 112 calculates the amount of staying data of the base station 103 and the buffer exhaustion time (step S12). Specifically, the buffer status estimation unit 112 uses the acquired communication information to calculate the amount of staying data of the base station 103 and the buffer exhaustion time. Then, the buffer status estimation unit 112 transmits the calculated buffer depletion time to the transmission time calculation unit 113.
  • the buffer status estimation unit 112 may calculate the amount of staying data of the base station 103 based on the amount of transmission data transmitted by the own communication device 11 and the amount of reception data received by the terminal device 12.
  • the terminal device 12 may notify the communication device 11 of the upper limit value of the data amount that the terminal device 12 can receive.
  • the buffer status estimation unit 112 may use the value described in the TCP header as the upper limit value of the amount of data that the terminal device 12 can receive.
  • the buffer status estimation unit 112 may calculate the amount of staying data based on the upper limit value of the reception window size of the terminal device 12.
  • the buffer status estimation unit 112 may calculate the staying data amount of the base station 103 based on the upper limit value of the staying data amount of the transmission buffer of the base station 103.
  • the buffer status estimation unit 112 calculates the time T seconds after the reference time as the buffer depletion time.
  • the reference time may be, for example, the time at which the buffer status estimation unit 112 calculates the buffer exhaustion time. Further, the reference time may be, for example, the latest time at which the communication device 11 transmitted data.
  • the buffer status estimation unit 112 may calculate the buffer exhaustion time by dividing the amount of staying data in the transmission buffer of the base station 103 and the wireless communication speed.
  • the buffer status estimation unit 112 calculates the amount of stagnant data or the wireless communication speed in the transmission buffer of the base station 103 based on the communication information acquired by the terminal device 12 on the transmitting side or the communication information acquired by the communication device 11. May be
  • the buffer status estimation unit 112 may use the TCP throughput within the latest predetermined time as an approximation of the wireless communication speed.
  • the buffer status estimation unit 112 may calculate, as an approximate value of the wireless communication speed, a value calculated taking into consideration the status of carrier aggregation based on the TCP throughput within the latest predetermined time.
  • the buffer status estimation unit 112 calculates, for the terminal apparatus 12 to which the carrier aggregation technique is applied, the TCP throughput of the latest predetermined time and the number of component carriers used by the terminal apparatus 12.
  • the buffer status estimation unit 112 calculates an approximate value of the wireless communication speed.
  • the buffer status estimation unit 112 may calculate the approximate value of the wireless communication speed using TCP throughput * f (N_CC).
  • f (N_CC) is a TCP throughput corresponding to the number of component carriers used by the terminal device 12.
  • the buffer status estimation unit 112 uses the carrier aggregation technology to estimate the number of component carriers used by the terminal device 12. In that case, as the number of component carriers increases, the frequency of occurrence of wireless communication speed deterioration increases. Therefore, the buffer status estimation unit 112 estimates the number of component carriers based on the frequency (the number of occurrences within a predetermined time) when the arrival interval of acknowledgments (for example, ACK signals) exceeds a certain threshold using this characteristic. May be
  • the transmission time calculation unit 113 calculates an additional transmission time (step S13). Specifically, the transmission time calculation unit 113 takes into consideration the time until the data transmitted by the new data transmission unit 114 arrives at the transmission buffer of the base station 103 from the response signal reception unit 111 (that is, the transmission delay). , Calculate additional sending time. This is to prevent the buffer of the base station 103 from becoming empty.
  • the transmission time calculation unit 113 calculates half of the round trip delay (RTT / 2) as the transmission delay based on the round trip delay (RTT) between the communication apparatus 11 and the terminal apparatus 12.
  • the transmission time calculation unit 113 may use, for the round trip delay, the smallest RTT in the current TCP session or a plurality of TCP sessions for the same terminal 12 or the smallest RTT in the latest time. As a result, the transmission time calculation unit 113 can use the effective minimum delay excluding the queuing delay of the base station 103.
  • the transmission time calculation unit 113 may calculate the transmission delay based on the time stamp described in the packet. For example, as shown in FIG. 9, the time at which the communication device 11 transmits a packet is Ta, and the time at which the communication device 11 receives a packet is Tb. In that case, RTT is Tb-Ta. However, in the terminal device 12, processing time is required to process the received packet. Therefore, the transmission time calculation unit 113 removes the processing time (Ty-Tx) of the terminal device 12 when calculating the effective one-way delay.
  • the transmission time calculation unit 113 uses ((Tb-Ta)-(Ty-Tx)) to transmit transmission data as a response signal
  • the time until arrival at the transmission buffer of the base station 103 from the unit 111 is calculated.
  • the terminal device 12 may describe the time Tx and the time Ty in the packet by using the option field of the header of TCP.
  • step S14 the transmission time calculation unit 113 determines whether the additional transmission time is exceeded and whether the response signal reception unit 111 has not received a new ACK.
  • step S14 If the additional transmission time is exceeded, and if the response signal receiving unit 111 has not received a new ACK during the measurement period (Yes in step S14), the transmission time calculation unit 113 performs an additional transmission process. Run. Then, the process proceeds to step S15.
  • the transmission time calculation unit 113 may start a timer. Then, the transmission time calculation unit 113 may measure an elapsed time since the start of activation of the timer.
  • step S14 when the response signal receiving unit 111 receives a new ACK before the additional transmission time is exceeded (No in step S14), the process returns to step S12 and continues the process.
  • the terminal device communication unit 121 estimates that the base station RLC layer 1032 is performing retransmission.
  • the terminal device communication unit 121 can not receive the TCP ACK.
  • the buffer status estimation unit 112 estimates that the amount of staying data in the transmission buffer of the base station 103 is decreasing successively. Therefore, the transmission time calculation unit 113 determines whether or not additional transmission is necessary.
  • the buffer status estimation unit 112 may estimate the amount of stagnated data in the transmission buffer of the base station 103 using acknowledgments of other protocols instead of TCP ACK.
  • the buffer status estimation unit 112 may estimate the amount of stagnant data in the transmission buffer of the base station 103 using a response signal of Quick UDP Internet Connections (QUIC) and Message Queue Telemetry Transport (MQTT).
  • the response signal is not limited to being transmitted to the terminal transport layer 1210, but may be transmitted to another layer (for example, an application layer).
  • the terminal device 12 according to the present embodiment is limited to the case of transmitting a response signal using TCP of the terminal transport layer 1210.
  • the transmission time calculation unit 113 measures an elapsed time after the response signal reception unit 111 receives the latest ACK. In addition, when a plurality of TCP sessions for the same terminal apparatus 12 simultaneously communicate with the communication apparatus transport layer 1111, the transmission time calculation unit 113 determines an elapsed time from the time when the latest ACK is received among the plurality of TCP sessions. Measure In addition, the transmission time calculation unit 113 may measure an elapsed time after the response signal reception unit 111 transmits the latest packet.
  • step S15 the transmission time calculation unit 113 calculates a transmission rate.
  • the wireless communication speed within the latest predetermined time may be calculated as the transmission rate.
  • the transmission time calculation unit 113 may estimate the transmission rate using other communication characteristics.
  • the transmission time calculation unit 113 may calculate the transmission rate by approximating the TCP throughput in the latest predetermined time or the TCP transmission rate in the latest predetermined time. Also, the transmission time calculation unit 113 may calculate the transmission rate using the maximum TCP throughput in the TCP session or the maximum TCP throughput in the most recent predetermined time.
  • the transmission time calculation unit 113 calculates the transmission rate using the maximum value of the TCP throughputs of a plurality of TCP sessions or the sum of the TCP throughputs of a plurality of TCP sessions within the most recent predetermined time. It is also good.
  • the communication apparatus 11 may transmit at a higher transmission rate to the terminal apparatus 12 to which the carrier aggregation technology is applied.
  • the transmission time calculation unit 113 calculates the transmission rate using, for example, the same calculation as that when the buffer status estimation unit 112 approximates the wireless communication speed. Thereafter, the transmission time calculation unit 113 transmits the calculated transmission rate to the new data transmission unit 114.
  • step S16 the new data transmission unit 114 transmits new data.
  • TCP there is a mechanism for suppressing the amount of unconfirmed data to a predetermined value even if the amount of data is successfully transmitted, for congestion control.
  • control is performed so that the amount of in-flight data does not exceed the congestion window (cwnd) size.
  • control is performed so as not to exceed the reception window (rwnd) size included in the header of the ACK packet returned from the reception side.
  • the communication apparatus 11 may have a congestion window (cwnd) size, or a reception window (rwnd) size included in the header of an ACK packet, or an upper limit value of a buffer of the communication apparatus transport layer 1111 or a base Data exceeding at least one value of the upper limit value of the transmission buffer of the station 103 can be transmitted. Therefore, when transmitting new data, the new data transmission unit 114 ignores the congestion window (cwnd) size, the reception window (rwnd) size included in the header of the ACK packet, or the buffer size of the transmission buffer. It can send data.
  • cwnd congestion window
  • rwnd reception window
  • the communication apparatus 11 is estimated based on the wireless communication characteristic of the base station 103 that the amount of staying data in the transmission buffer of the base station 103 becomes equal to or less than a predetermined threshold. Predict time (ie, buffer exhaustion time). Thereafter, the communication apparatus 11 transmits new data to the base station 103 via the new data transmission unit 114 before the amount of staying data in the transmission buffer of the base station 103 becomes equal to or less than a predetermined threshold (for example, becomes zero). Send additional. Thereby, the communication apparatus 11 according to the present embodiment can maintain the amount of staying data in the transmission buffer of the base station 103 as the amount of data larger than a predetermined threshold (for example, larger than zero). Thus, the communication device 11 contributes to the prevention of impossibility of transmitting new data in the wireless layer. As a result, the communication device 11 can prevent the deterioration of the communication performance.
  • FIG. 10 is a diagram showing an example of the configuration of the communication device 21 according to the second embodiment.
  • the base station information acquisition unit 215 acquires information on the base station 103 (hereinafter referred to as base station information) from the base station 103. For example, the base station information acquisition unit 215 sets the upper limit value of the transmission buffer of the base station 103 (hereinafter also referred to as the upper limit value of the buffer size) and the amount of data staying in the transmission buffer of the base station 103 as base station information. It may be acquired as Also, for example, the base station information acquisition unit 215 acquires base station information with the wireless communication speed of the base station 103 and the terminal device 12 and the number of communication radio waves between the base station 103 and the terminal device 12 (carrier aggregation status). May be Then, the base station information acquisition unit 215 transmits the acquired base station information to the buffer status estimation unit 212.
  • base station information acquires information on the base station 103 (hereinafter referred to as base station information) from the base station 103. For example, the base station information acquisition unit 215 sets the upper limit value of the transmission buffer of the base station
  • the response signal receiving unit 211 has the same configuration as the response signal receiving unit 111 according to the first embodiment, and thus the description thereof will be omitted.
  • the transmission time calculation unit 213 has the same configuration as the transmission time calculation unit 113 according to the first embodiment, and thus the description thereof will be omitted.
  • the new data transmission unit 214 has the same configuration as the new data transmission unit 114 according to the first embodiment, and thus the description thereof will be omitted.
  • FIG. 11 is a flowchart showing an example of the operation of the communication apparatus 21 according to the second embodiment.
  • the base station information acquisition unit 215 acquires base station information from the base station 103 (step S21). For example, from the base station 103, the base station information acquisition unit 215 sets the upper limit value of the transmission buffer (the upper limit value of the buffer size), the amount of data staying in the transmission buffer, the wireless communication speed with the terminal device 12, At least one piece of information is acquired among the number of communication radio waves (carrier aggregation status). Then, the base station information acquisition unit 215 transmits the acquired information from the base station 103 to the buffer status estimation unit 212.
  • the base station information acquisition unit 215 transmits the acquired information from the base station 103 to the buffer status estimation unit 212.
  • the buffer status estimation unit 212 acquires the round trip delay, the in-flight data amount, and the TCP throughput as communication information from the response signal reception unit 211 (step S22).
  • the buffer status estimation unit 212 calculates the amount of staying data of the base station 103 and the buffer exhaustion time (step S23). Specifically, the buffer status estimation unit 212 uses the communication information acquired from the response signal reception unit 211 and the base station information acquired from the base station information acquisition unit 215, and uses the amount of stagnated data in the base station 103, and Calculate buffer exhaustion time.
  • the buffer status estimation unit 212 combines the communication information acquired from the response signal reception unit 211 and the base station information acquired from the base station information acquisition unit 215 to determine the amount of staying data of the base station 103 and the buffer exhaustion time. You may calculate Alternatively, the buffer status estimation unit 212 uses one of the communication information acquired from the response signal reception unit 211 and the base station information acquired from the base station information acquisition unit 215 to hold the base station 103. The amount of data and buffer exhaustion time may be calculated.
  • the buffer status estimation unit 212 can calculate the buffer exhaustion time by dividing the amount of staying data and the wireless communication speed. Specifically, the buffer status estimation unit 212 estimates the amount of stagnated data in the transmission buffer of the base station 103 and the wireless communication speed. Then, assuming that data is transmitted at the estimated wireless communication speed, the buffer status estimation unit 212 calculates the buffer depletion time by calculating the time when transmission of the estimated amount of stagnant data is finished.
  • the buffer status estimation unit 212 uses the base station information acquired from the base station information acquisition unit 215 to calculate the amount of stagnant data in the transmission buffer of the base station 103 and the wireless communication speed. For example, the buffer status estimation unit 212 uses at least one of the amount of staying data in the transmission buffer of the base station 103 acquired from the base station information acquisition unit 215 and the upper limit value of the transmission buffer of the base station 103 The amount of staying data in the transmission buffer of the base station 103 is calculated.
  • the buffer status estimation unit 212 may use the wireless communication speed between the base station 103 and the terminal device 12 acquired from the base station information acquisition unit 215 or the maximum wireless communication speed within a predetermined time.
  • the buffer status estimation unit 212 calculates that the amount of staying data in the transmission buffer of the base station 103 becomes less than or equal to a predetermined threshold (for example, becomes zero) after time T seconds from the reference time. In that case, the buffer status estimation unit 212 calculates the time after T seconds has elapsed since the reference time as the buffer depletion time. Then, the buffer status estimation unit 212 transmits the calculated buffer depletion time to the transmission time calculation unit 213.
  • a predetermined threshold for example, becomes zero
  • the transmission time calculation unit 213 calculates the additional transmission time (step S24). Specifically, the transmission time calculation unit 213 takes into consideration the time until the additionally transmitted data arrives from the response signal reception unit 211 to the transmission buffer of the base station 103 (that is, the transmission delay), and determines the additional transmission time. calculate.
  • the transmission time calculation unit 213 may use the information notified from the base station 103 to calculate the additional transmission time. For example, the transmission time calculation unit 213 uses the round trip delay between the base station 103 and the terminal 12 or the one-way delay, or the additional transmission time using the time stamp described in the information notified from the base station 103. It may be calculated.
  • the transmission time calculation unit 213 measures an elapsed time from when the response signal reception unit 211 receives the latest ACK. Further, in the communication apparatus transport layer 1111, when a plurality of TCP sessions for the same terminal apparatus 12 simultaneously communicate, the transmission time calculation unit 213 is an elapsed time from the time when the latest ACK was received among the plurality of TCP sessions. Measure Further, the transmission time calculation unit 213 may measure an elapsed time from the time when the response signal reception unit 211 transmitted the latest packet.
  • step S25 the transmission time calculation unit 213 determines whether the response signal reception unit 211 has not received a new ACK during the measurement period, in which the additional transmission time is exceeded.
  • step S25 If the additional transmission time is exceeded and the response signal reception unit 211 has not received a new ACK during the measurement period (Yes in step S25), the transmission time calculation unit 213 performs the additional transmission process. Run. Then, the process proceeds to step S26.
  • the transmission time calculation unit 213 may start a timer and measure an elapsed time after starting the timer.
  • step S25 if the response signal receiving unit 211 receives a new ACK during timer activation (No branch of step S25) until the additional transmission time is exceeded, the process proceeds to step S23 and the process is continued.
  • step S26 the transmission time calculation unit 213 calculates a transmission rate.
  • the transmission time calculation unit 213 calculates, for example, the wireless communication speed within the latest predetermined time as a transmission rate. Also, the transmission time calculation unit 213 may calculate the transmission rate by combining the communication information acquired from the response signal reception unit 211 and the base station information acquired from the base station information acquisition unit 215. Also, the transmission time calculation unit 213 calculates the transmission rate using one of the communication information acquired from the response signal reception unit 211 and the base station information acquired from the base station information acquisition unit 215. May be
  • the transmission time calculation unit 213 uses the wireless communication speed between the base station 103 and the terminal apparatus 12 or the maximum wireless communication speed within a predetermined time period acquired from the base station information acquisition unit 215 to transmit the transmission rate. It may be calculated.
  • the transmission time calculation unit 213 may calculate the wireless communication speed using the same method as in the first embodiment. In that case, the transmission time calculation unit 213 may use the base station information acquired from the base station information acquisition unit 215 to calculate the wireless communication speed.
  • the base station information acquisition unit 215 acquires the number of communication radio waves (carrier aggregation status) between the base station 103 and the terminal device 12. Then, the transmission time calculation unit 213 calculates the wireless communication speed based on the most recent TCP throughput for a predetermined time and the number of component carriers used by the terminal device 12. Thereafter, the transmission time calculation unit 213 transmits the calculated transmission rate to the new data transmission unit 214.
  • the new data transmission unit 214 transmits the new data (step S27).
  • the new data transmission unit 214 operates in the same manner as the new data transmission unit 114 according to the first embodiment. That is, when transmitting new data, the new data transmission unit 214 can transmit data ignoring the transmission amount, transmission time, or communication rate restriction defined by the communication protocol.
  • the response signal receiving unit 211 may receive the wireless communication speed between the base station 103 and the terminal device 12 from the terminal device 12.
  • the communication device 21 according to the present embodiment contributes to the prevention of deterioration in communication performance as compared with the communication device 11 according to the first embodiment.
  • the reason is that the communication apparatus 21 according to the second embodiment predicts the buffer exhaustion time based on the base station information acquired from the base station 103.
  • the communication apparatus 21 according to the present embodiment obtains the base station information directly from the base station 103 and calculates the transmission rate, thereby calculating the difference between the wireless communication speed acquired from the base station 103 and the calculated transmission rate. Can be reduced. Therefore, the communication apparatus 21 according to the present embodiment can avoid transmitting data using an under or over transmission rate.
  • the communication device 21 according to the present embodiment contributes to preventing the performance deterioration of the communication network.
  • the communication device 21 according to the present embodiment contributes to avoiding transmission of an amount of data exceeding the capability of the transmission buffer of the base station 103.
  • the buffer status estimation unit calculates a time at which the stagnant data is estimated to be equal to or less than a predetermined threshold as a buffer depletion time, and the transmission time calculation unit transmits between the own communication device and the terminal device
  • the communication apparatus according to Mode 1 calculates the additional transmission time based on the delay, the reception time, and the buffer depletion time.
  • the buffer status estimation unit further calculates the amount of staying data by further using the amount of transmission data transmitted by the own communication device and the amount of reception data received by the terminal device acquired from the confirmation response signal.
  • the communication device according to aspect 1 or 2.
  • the buffer status estimation unit is based on at least one of the upper limit value of the reception window size of the terminal apparatus and the upper limit value of the stagnated data amount of the transmission buffer of the base station.
  • the communication device according to any one of aspects 1 to 3, preferably for calculating an amount.
  • Mode 5 The communication apparatus according to any one of modes 1 to 4, wherein the buffer status estimation unit calculates the wireless communication speed based on the amount of transmission data transmitted by the own communication apparatus.
  • Mode 6 The communication apparatus according to any one of modes 1 to 5, further comprising: a base station information acquisition unit that acquires the wireless communication speed from the base station.
  • the transmission time calculation unit determines that at least one of an elapsed time from the reception time of the latest response signal and an elapsed time from the latest data transmission time reaches a threshold set in advance.
  • the communication apparatus according to any one of modes 1 to 6, preferably determining time as the additional transmission time.
  • Mode 8 The communication apparatus according to any one of modes 1 to 7, wherein the transmission time calculation unit calculates a transmission rate based on the wireless communication speed.
  • the buffer status estimation unit calculates a time at which the stagnant data is estimated to be less than or equal to a predetermined threshold as a buffer depletion time, and the transmission time calculation unit transmits between the own communication device and the terminal device Preferably, the communication system according to mode 9, wherein the additional transmission time is calculated based on the delay, the reception time, and the buffer depletion time.
  • the method further includes the step of calculating the time when the stagnant data is estimated to be equal to or less than a predetermined threshold as the buffer depletion time, and in the step of calculating the additional transmission time, transmission between the own communication device and the terminal device Preferably, the communication method according to Aspect 11, wherein the additional transmission time is calculated based on the delay, the reception time, and the buffer depletion time.
  • Mode 14 The process of calculating the additional transmission time by causing the computer to further execute the process of calculating the buffer depletion time as the time when the stagnant data is estimated to be equal to or less than a predetermined threshold.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Communication Control (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente invention contribue à la prévention de la dégradation d'une vitesse de communication. L'invention concerne un dispositif de communication permettant de transmettre des données à un dispositif terminal par l'intermédiaire d'une station de base. Le dispositif de communication comprend : une unité de réception de signal de réponse pour recevoir une réponse de confirmation en provenance du dispositif terminal; une unité d'estimation d'état de tampon pour calculer une vitesse de communication sans fil entre la station de base et le dispositif terminal, calculer la quantité de données retenues dans un tampon de transmission de la station de base en tant que quantité retenue de données, et prédire un changement de la quantité retenue de données sur la base de la vitesse de communication sans fil, la quantité retenue de données et le temps de réception de la réponse de confirmation; une unité de calcul de temps de transmission pour calculer un temps auquel de nouvelles données sont transmises au dispositif terminal en tant que temps de transmission supplémentaire sur la base du changement prédit par l'unité d'estimation d'état de tampon; et une nouvelle unité de transmission de données pour exécuter une transmission de nouvelles données au dispositif terminal à un débit de transmission prescrit à condition qu'au moins le temps de transmission supplémentaire s'est écoulé.
PCT/JP2019/001756 2018-01-25 2019-01-22 Dispositif de communication, système de communication, procédé de communication, et programme WO2019146563A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2019567068A JP6973511B2 (ja) 2018-01-25 2019-01-22 通信装置、通信システム、通信方法及びプログラム

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-010571 2018-01-25
JP2018010571 2018-01-25

Publications (1)

Publication Number Publication Date
WO2019146563A1 true WO2019146563A1 (fr) 2019-08-01

Family

ID=67395434

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/001756 WO2019146563A1 (fr) 2018-01-25 2019-01-22 Dispositif de communication, système de communication, procédé de communication, et programme

Country Status (2)

Country Link
JP (1) JP6973511B2 (fr)
WO (1) WO2019146563A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023058187A1 (fr) * 2021-10-07 2023-04-13 日本電信電話株式会社 Système de commande, procédé de commande, dispositif de commande, et programme

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012528494A (ja) * 2009-05-29 2012-11-12 ホアウェイ・テクノロジーズ・カンパニー・リミテッド 無線通信システムにおける中継ノードフロー制御のためのシステムおよび方法
JP2015006008A (ja) * 2014-10-08 2015-01-08 株式会社東芝 無線通信端末

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012528494A (ja) * 2009-05-29 2012-11-12 ホアウェイ・テクノロジーズ・カンパニー・リミテッド 無線通信システムにおける中継ノードフロー制御のためのシステムおよび方法
JP2015006008A (ja) * 2014-10-08 2015-01-08 株式会社東芝 無線通信端末

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023058187A1 (fr) * 2021-10-07 2023-04-13 日本電信電話株式会社 Système de commande, procédé de commande, dispositif de commande, et programme

Also Published As

Publication number Publication date
JP6973511B2 (ja) 2021-12-01
JPWO2019146563A1 (ja) 2021-01-14

Similar Documents

Publication Publication Date Title
US10594596B2 (en) Data transmission
US9674095B2 (en) Communication node
US9655003B2 (en) Systems and methods for improved wireless interface aggregation
US9356878B2 (en) Method for avoiding network congestion and an apparatus thereof
EP1568180B1 (fr) Procede permettant d'ameliorer la qualite de la transmission de multimedia en continu
US8284667B2 (en) Efficient flow control in a radio network controller (RNC)
KR102476192B1 (ko) 패킷 전송 방법 및 관련 장치
KR100600607B1 (ko) 무선 휴대 인터넷 시스템에서 ａｒｑ 제어 장치 및 제어방법
JP2020520567A (ja) パケットデータコンバージェンスプロトコル（ｐｄｃｐ）の再順序付けのためのネットワークノードとその方法
US9167473B2 (en) Communication processing method, apparatus and gateway device
US20170027016A1 (en) Communication device, wireless communication device, and communication method
WO2014069642A1 (fr) Dispositif de communication, procédé de commande de sortie de données de transmission, et leur programme
CN109314608A (zh) 一种数据传输方法、网络设备及终端设备
CN113872726A (zh) 近场通信场景下调整发送速率的方法、装置及系统
KR20170142513A (ko) 다중망 병합 전송 장치, 그리고 이의 패킷 스케줄링 방법
US20080285447A1 (en) Session Relaying Apparatus, Session Relay Method, and Session Relay Program
WO2019146563A1 (fr) Dispositif de communication, système de communication, procédé de communication, et programme
JP2002281047A (ja) パケット通信制御装置及び方法、データ通信中継装置及び方法、並びにネットワークシステム
JP3953343B2 (ja) 無線パケット通信装置および無線パケット通信方法
US9385931B1 (en) Determining a reordering timer
EP2890179B1 (fr) Procédé, appareil et programme informatique pour le transfert de données
Kumar et al. Device‐centric data reordering and buffer management for mobile Internet using Multipath Transmission Control Protocol
US20210127301A1 (en) Application Notifications from Network for Throughput and Flow Control Adaptation
KR20140110184A (ko) 다중경로 전송제어프로토콜을 이용한 수직적 핸드오버시 빠른 성능 회복 방법 및 이를 이용한 이동 단말
JP5324038B2 (ja) 通信制御装置、無線通信装置、通信制御方法及び無線通信方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19743567

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2019567068

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19743567

Country of ref document: EP

Kind code of ref document: A1