JP2018113540A - Radio communication device and radio communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication device and radio communication method capable of ensuring communication quality in utilizing MPTCP for handling a bundle of a plurality of physical links as a single logical link.SOLUTION: A radio communication device for utilizing MPTCP for handling a bundle of a plurality of physical links as a single logical link comprises: monitoring means for monitoring a packet loss rate in each link of the plurality of physical links in link aggregation for bundling the plurality of physical links; and communication channel stop means that when a packet loss rate of at least one of the plurality of physical links monitored by the monitoring means exceeds a predetermined threshold, disables the link whose packet loss rate exceeds the predetermined threshold.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wireless communication apparatus and a wireless communication method, and more particularly to a technique for performing wireless communication using a plurality of communication lines.

  In recent wireless networks, the transmission capacity tends to increase, and a technique for securing a transmission band as wide as possible is indispensable. In order to ensure a wide transmission band, it is advantageous to increase the number of modulation levels. However, when the multi-level number of modulation is increased, it is easily affected by noise and the error rate is deteriorated. Therefore, when the wireless transmission quality decreases, the adaptive modulation system (AMR) that reduces the number of modulation levels and prevents the error rate from degrading can be used. Dealing with degradation is taking place.

  However, in the adaptive modulation system, when the wireless transmission quality is lowered, the multi-value number is lowered and the system gain is improved, so that the wireless transmission capacity is reduced. As a result, the wireless transmission capacity may be smaller than the required transmission capacity, which causes the high priority frame to occupy the transmission band in the wireless section and increase the transmission delay of the low priority frame. Becomes a network bottleneck.

  Therefore, in the prior art, in a wireless network having a plurality of active lines and protection lines, a wireless network system comprising a plurality of active lines and protection lines, a means for detecting a line failure, Means to use the standby line as a substitute for the working line where the failure has occurred when a line failure occurs, and consolidate the protection line with the working line when no line failure has occurred Thus, a wireless network has been proposed (for example, Patent Document 1).

  In order to cope with an increase in transmission capacity, a technique called MPTCP (Multipath TCP) has been proposed (for example, Patent Document 2). In normal TCP, each of a transmission side and a reception side of a communication line has means for realizing one TCP function (hereinafter referred to as TCP means). For this reason, with a normal TCP, only one communication line can be used at a time.

  On the other hand, MPTCP is a technique for performing one TCP session using a plurality of communication lines and interfaces when communicating between terminals or between a terminal and a server using the Internet. Communication path) can be used simultaneously. For this reason, compared with the conventional TCP, it is possible to increase the communication speed and to improve the reliability of an unstable transmission medium such as wireless communication.

Japanese Patent Laying-Open No. 2015-201895

Ford, C. Raiciu, M. Handley, O. Bonaventure, RFC 6824: TCP Extensions for Multipath Operation with Multiple Addresses

  As described above, MPTCP wireless communication can use a plurality of communication lines at the same time. Compared with conventional TCP, the communication speed is increased and the reliability of an unstable transmission medium such as wireless communication is improved. Can be. However, when a plurality of communication lines have a line with poor communication quality, there is a problem that the communication speed is lowered.

  The present invention has been made in view of the above-described problems, and an object of the present invention relates to a wireless communication apparatus and a wireless communication method capable of ensuring communication quality when using a plurality of different communication lines.

  A wireless communication device according to the present invention is a wireless communication device that uses MPTCP that bundles a plurality of physical links and handles them as a single logical link, and in link aggregation that bundles the plurality of physical links, A monitoring unit that monitors a packet loss rate in each link; and at least one of the plurality of physical links monitored by the monitoring unit exceeds a predetermined threshold when the packet loss rate exceeds a predetermined threshold. And a communication line stop means for invalidating the link.

  According to the above configuration, in the link aggregation in which the plurality of physical links are bundled, the monitoring unit monitors the packet loss rate in each link of the plurality of physical links, and at least one of the plurality of physical links monitored by the monitoring unit. When the packet loss rate exceeds a predetermined threshold, the communication line stopping unit invalidates the link whose packet loss rate exceeds the predetermined threshold. For this reason, communication quality can be secured in a wireless communication apparatus using MPTCP that bundles a plurality of physical links and handles them as one logical link.

  The communication line stopping unit of the wireless communication apparatus according to the present invention is characterized in that when the packet loss rate monitored by the monitoring unit exceeds a predetermined threshold, only the transmission of the MPTCP traffic is invalidated.

  According to the above configuration, the communication line stopping unit invalidates only the transmission of MPTCP traffic when the packet loss rate monitored by the monitoring unit exceeds a predetermined threshold. For this reason, communication quality can be secured in a wireless communication apparatus using MPTCP that bundles a plurality of physical links and handles them as one logical link.

  The wireless communication apparatus according to the present invention is characterized in that the plurality of physical links have different communication methods.

  According to said structure, since a some physical link mutually differs in a communication system, communication quality can be ensured more effectively.

  The wireless communication apparatus according to the present invention is characterized in that the predetermined threshold is within a range of 0.01% to 1%.

  According to said structure, since the threshold of the packet loss rate which stops utilization of a communication line is in the range of 0.01% -1%, the reduction of communication speed is suppressed and communication quality is effectively ensured. Can do.

  The wireless communication method according to the present invention is a wireless communication method using MPTCP that bundles a plurality of physical links and handles them as a single logical link, and in a link aggregation in which the monitoring unit bundles the plurality of physical links, The step of monitoring the packet loss rate in each of the physical links, and the communication line stopping means, when at least one of the packet loss rates of the plurality of physical links monitored by the monitoring means exceeds a predetermined threshold, And a step of invalidating a link having a packet loss rate exceeding a predetermined threshold value.

  According to the above configuration, in the link aggregation in which the plurality of physical links are bundled, the monitoring unit monitors the packet loss rate in each link of the plurality of physical links, and at least one of the plurality of physical links monitored by the monitoring unit. When the packet loss rate exceeds a predetermined threshold, the communication line stopping unit invalidates the link whose packet loss rate exceeds the predetermined threshold. For this reason, communication quality can be secured in a wireless communication apparatus using MPTCP that bundles a plurality of physical links and handles them as one logical link.

  According to the present invention, it is possible to provide a wireless communication apparatus and a wireless communication method capable of ensuring communication quality when using MPTCP that bundles a plurality of physical links and handles them as one logical link.

It is a block diagram of the radio | wireless communications system which concerns on embodiment. It is a functional block diagram of the radio | wireless communication apparatus which concerns on embodiment. It is a flowchart figure which shows operation | movement of the radio | wireless communication apparatus which concerns on embodiment. It is a figure which shows the experimental result by the radio | wireless communication apparatus which concerns on an Example (LTE _loss = 1%). It is a figure which shows the experimental result by the radio | wireless communication apparatus which concerns on an Example (LTE _loss = 10%). It is a figure which shows the experimental result by the radio | wireless communication apparatus which concerns on an Example (WiFi _loss = 10%). It is a figure which shows the experimental result by the radio | wireless communication apparatus which concerns on an Example (WiFi _loss = 1%). It is a figure which shows the experimental result by the radio | wireless communication apparatus which concerns on an Example (WiFi _loss = 0.1%). It is a figure which shows the experimental result by the radio | wireless communication apparatus which concerns on an Example (WiFi _loss = 0.01%).

(Embodiment)
Hereinafter, a wireless communication apparatus and a wireless communication method according to the present embodiment will be described using the embodiment. In the present embodiment, communication is performed using a plurality of communication lines, and these are viewed as a single TCP connection (when viewed from the application). MPCTP (MultiPath TCP), which is a technology that makes it appear as if In this MPCTP, TCP connections (also referred to as physical links) for the same destination can be established for a plurality of communication lines, and a plurality of TCP connections are bundled into one (aggregation) to interface with an upper layer. Provided (MPTCP is a transport layer technology). In other words, since MTCTP performs data communication using a plurality of communication lines, there is an advantage that a TCP connection is maintained unless all communication lines are disconnected.

  For example, when moving outside the area during WiFi communication, the connection at the network layer will be lost once. However, if the TCP session is disconnected at this time, there is a possibility that the processing of the application may be hindered. However, since MPTCP realizes multihoming (ensuring communication path redundancy and load distribution) by simultaneously using a plurality of communication circuits, such a problem hardly occurs. Furthermore, since MPTCP is an extension of existing TCP (using options in the header), it can be used without changing the existing firewall or NAT.

  In MPTCP, MPTCP usually initializes the connection in the same way as TCP (using SYN, SUN / ACK, ACK) via the default link. However, the SYN packet includes an MP_CAPABLE option. The packet also includes some additional flags for use of checksums and ciphers and an authentication key for authenticating subflows added later to the MPTCP connection.

  If the SYN receiver is MPTCP compliant, it sends an MP_CAPABLE signal (ie with an authentication key and flag). When the signal is successfully received, initialization is complete. If the SYN receiver is not compatible with MPTCP, the next progress is the same as TCP. If an MPTCP compatible device has an extra interface compared to TCP, MPTCP sends a new SYN with a JOIN option. If the flow establishment is successful, a new TCP flow is created for data transmission, so that the device sends data simultaneously over two links (eg, LTE and WiFi).

  However, unlike a wired line, a wireless line is very dynamic and its communication quality changes constantly. For this reason, there is a possibility that serious packet loss may occur in the wireless line, and the existing MPTCP cannot cope with this dynamic property. Specifically, if there is a communication line with a high packet loss rate, aggregation (aggregation) by MPTCP does not occur, and in addition to the inherent overhead caused by the implementation of MPTCP, the throughput, which is the amount of data communication per short time, decreases. On the other hand, performance deteriorates.

  The inventors have identified a critical value (threshold value) for the loss rate of packets whose performance deteriorates. When this critical value (threshold value) is exceeded, the use of communication lines that exceed the critical value (threshold value) of the packet loss rate is stopped, that is, by disabling (standby state), a plurality of different communication lines are set. The present invention proposes a wireless communication apparatus and a wireless communication method capable of ensuring communication quality when used. Note that the communication line in the present embodiment refers to a physical medium or route for transmitting signals and data to another device (device) at a location away from a certain device (device).

  FIG. 1 is a configuration diagram of a wireless communication system 1 according to the embodiment. As shown in FIG. 1, the wireless communication system 1 includes a wireless communication device 2 and a server 3, and different first and second communication lines 6 and 7 (physical links) between the wireless communication device 2 and the server 3. ) To enable simultaneous connection. The wireless communication device 2 is, for example, a smartphone, a tablet terminal, a mobile PC, or the like.

  The first communication line 6 is a communication line such as 3G, 4G, or LTE (long term evolution). When the wireless communication device 2 and the server 3 use the first communication line 6, data is transmitted / received via the base station 4. The second communication line 7 is a communication line using, for example, WiFi (registered trademark). When the wireless communication device 2 and the server 3 use the second communication line 7, data is transmitted / received via the access point 5.

  FIG. 2 is a functional block diagram of the wireless communication device 2 according to the embodiment. 2 is stored in a storage medium such as an HDD or a non-volatile memory (for example, a flash memory) by a processor such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit). It is realized by loading the program.

  As shown in FIG. 2, the wireless communication apparatus 2 includes a first communication IF (Inter face) 21, a second communication IF (Inter face) 22, a monitoring unit 23, a communication line stop unit 24, and a storage Means 25 and control means 26 are provided at least. The first communication IF 21 is an interface used when the first communication line 6 is used, and corresponds to a communication system such as 3G, 4G, LTE (long term evolution), for example. The second communication IF 22 is an interface used when the second communication line 7 is used, and corresponds to a wireless LAN communication method such as WiFi (registered trademark).

  The monitoring unit 23 monitors the communication quality of a plurality of communication lines (physical links) used in the wireless communication system 1 according to the embodiment. Specifically, the monitoring unit 23 monitors the packet loss rate in the first and second communication lines 6 and 7. Here, the packet loss rate is the rate of the total number of packets that are lost before the packet sent from the transmission side reaches the reception side.

  When at least one of the plurality of communication lines monitored by the monitoring unit 23 falls below a predetermined communication quality, the communication line stop unit 24 invalidates the communication line below the predetermined communication quality. Specifically, when the packet loss rate monitored by the monitoring unit 23 exceeds a predetermined threshold value, the communication line stopping unit 24 sets the packet loss rate of the first and second communication lines 6 and 7 to a predetermined threshold value. The communication line exceeding 1 is disabled (Disable) or only the transmission of MPTCP traffic is disabled (Disable).

  The storage unit 25 stores a threshold (predetermined threshold) of the packet loss rate that is referred to by the communication line stop unit 24. In the wireless communication device 2 according to the present embodiment, the predetermined threshold is preferably 5% and more preferably set to 1% in the case of LTE. In the wireless communication device 2 according to the present embodiment, the predetermined threshold is preferably 0.1% and more preferably set to 0.001% in the case of 4G. The control unit 26 controls the entire wireless communication device 2.

  FIG. 3 is a flowchart illustrating the operation of the wireless communication apparatus according to the embodiment. Hereinafter, the operation (wireless communication method) of the wireless communication apparatus 2 according to the present embodiment will be described with reference to FIGS.

  When performing data communication, the wireless communication device 2 starts link aggregation of the first and second communication lines 6 and 7 with the server 3 (S101). Next, it is confirmed whether the connection of both the first and second communication lines 6 and 7 is established (S102).

  When the connection of both the first and second communication lines 6 and 7 is established (Yes in S102), the monitoring unit 23 of the wireless communication device 2 transmits the packet on the first and second communication lines 6 and 7. The loss rate is monitored (S103). The communication line stopping unit 24 of the wireless communication apparatus 2 determines whether the packet loss rate monitored by the monitoring unit 23 exceeds a predetermined threshold (S104). When the packet loss rate monitored by the monitoring unit 23 does not exceed the predetermined threshold (No in S104), link aggregation of the first and second communication lines 6 and 7 is established (Yes in S102).

  If the connection of at least one of the first and second communication lines 6 and 7 has not been established (No in S102), the wireless communication device 2 identifies the communication line in which the connection has not been established (S106). . When the packet loss rate monitored by the monitoring unit 23 exceeds a predetermined threshold (Yes in S104), the wireless communication device 2 identifies a communication line whose packet loss rate exceeds the predetermined threshold ( S107). The communication line stopping unit 24 of the wireless communication apparatus 2 disables use of the communication line specified in S106 and S107 of FIG. 3 or disables only transmission of MPTCP traffic (S108).

  4-9 is a figure which shows the experimental result by the radio | wireless communication apparatus which concerns on embodiment. Hereinafter, experimental results of the wireless communication apparatus according to the present embodiment will be described with reference to FIGS. 4 and 5. In this embodiment, mobile devices and servers corresponding to the wireless communication apparatus 2 and the server 3 described with reference to FIG. 1 are prepared, and LTE (corresponding to the first communication line) and WiFi (first communication line) are used as communication lines. Throughput (Mbps: Megabyte per second) was measured, which is the amount of data communication per short time when using the communication line 2).

4 to 9 are diagrams showing experimental results when LTE (corresponding to the first communication line) and WiFi (corresponding to the second communication line) are simultaneously used as communication lines. The link parameters (delay, jitter, bandwidth) of LTE and WiFi were set as shown in Table 1 below.

  The jitter value of each communication line (path) in one execution was selected within the above range in order to make the delay dynamic at random. The mobile device and server used Linux kernel version 3.18.20 and MPTCP version 0.90.0. In addition, in order to form a network of LTE and WiFi, the device and the server are connected to another Linux (registered trademark). In this example, an MPTCP barrier was used. The MPTCP balia is a state-of-the-art MPTCP that uses a scheduler and is superior to other MPCTP schedulers. In the system of this embodiment, the device and the server are connected to another Linux in order to form a network. In addition, new components were added to the transport layer to emulate lossy communication circuits (links).

  Specifically, in the example system, each interface has a new configuration file under the Linux proc that contains the loss probability value. If loss is configured on the interface, discard the packet according to the appropriate probability (ie in / net / ipv4 / ip # output.c). In order to reduce the interference caused by the environment, we disabled route caching and buffer auto-tuinig on Linux machines. In each execution, iperf3 generates a TCP flow between the device and the server.

  FIG. 4 is an experimental result when the packet loss rate of LTE is 1%. In FIG. 4, Example 1 is data indicating a result of applying the present invention, and Comparative Example 1 is an example of the present invention. It is data which shows the result of the conventional MPTCP which is not applied.

  FIG. 5 is a diagram showing an experimental result when the packet loss rate of LTE is 10%. Example 2 is data showing a result of applying the present invention, and Comparative Example 2 is applying the present invention. It is the data which shows the result of the conventional MPTCP which does not.

  In the experimental results shown in FIGS. 4 and 5, the predetermined threshold of the packet loss rate at which the communication line stopping unit 24 stops using the communication line is 1%. Also, the vertical axis in FIG. 4 and FIG. 5 indicates the throughput (Mbps: Megabyte per second), which is the amount of data communication per short time. The horizontal axis in FIGS. 4 and 5 indicates the bandwidth (Mbps: Megabyte per second) of a communication line using WiFi.

  FIG. 6 shows the experimental results when the packet loss rate of WiFi is 10%. In FIG. 6, Example 3 is data showing the result of applying the present invention, and Comparative Example 3 shows the present invention. It is data which shows the result of the conventional MPTCP which is not applied.

  FIG. 7 is a diagram showing an experimental result when the packet loss rate of WiFi is 1%. Example 4 is data showing a result of applying the present invention, and Comparative Example 4 applies the present invention. It is the data which shows the result of the conventional MPTCP which does not.

  FIG. 8 is a diagram showing an experimental result when the packet loss rate of WiFi is 0.1%, Example 5 is data showing a result of applying the present invention, and Comparative Example 5 is the present invention. This is data indicating the result of conventional MPTCP that does not apply.

  FIG. 9 is a diagram showing an experimental result when the packet loss rate of WiFi is 0.01%. Example 6 is data showing a result of applying the present invention, and Comparative Example 6 is the present invention. This is data indicating the result of conventional MPTCP that does not apply.

  In the experimental results shown in FIGS. 6 to 9, the predetermined threshold value of the packet loss rate at which the communication line stopping unit 24 stops using the communication line is set to 0.01%. In addition, the vertical axis in FIGS. 6 to 9 indicates the throughput (Mbps: Megabyte per second) which is the amount of data communication per short time. 6 to 9, the horizontal axis indicates the bandwidth (Mbps: Megabyte per second) of the communication line using LTE.

  In this embodiment, as shown in FIG. 4, when the packet loss rate of LTE is 1%, the embodiment 1 to which the present invention is applied is shorter in the narrower bandwidth than the comparative example 1 to which the present invention is not applied. It can be seen that the throughput, which is the amount of data communication per hour, is high. In addition, as shown in FIG. 5, when the packet loss rate of LTE is 10%, the second embodiment to which the present invention is applied is shorter in the short bandwidth and the shorter time than the second comparative example to which the present invention is not applied. It can be seen that the throughput, which is the amount of data communication, is further increased.

  In the present embodiment, as shown in FIG. 6, when the packet loss rate of WiFi is 10%, the third embodiment to which the present invention is applied is shorter in the narrower bandwidth than the third comparative example to which the present invention is not applied. It can be seen that the throughput, which is the amount of data communication per hour, is high. Further, as shown in FIG. 7, when the packet loss rate of WiFi is 1%, the fourth embodiment to which the present invention is applied is shorter in the narrow bandwidth than the comparative example 4 to which the present invention is not applied. It can be seen that the throughput, which is the amount of data communication, is further increased.

  Further, in this embodiment, as shown in FIG. 8, when the packet loss rate of WiFi is 0.1%, the embodiment 5 to which the present invention is applied is narrower than the comparative example 5 to which the present invention is not applied. It can be seen that the throughput, which is the amount of data communication per short time, is high in the bandwidth. Also, as shown in FIG. 9, when the packet loss rate of WiFi is 0.01%, the embodiment 6 to which the present invention is applied is shorter in the narrower bandwidth than the comparative example 6 to which the present invention is not applied. It can be seen that the throughput, which is the amount of data communication per unit, is further increased.

  As described above, in this embodiment, as shown in FIGS. 4 and 5, when LTE (corresponding to the first communication line) and WiFi (corresponding to the second communication line) are used simultaneously as communication lines, The packet loss rate of each communication line is monitored, and when the packet loss rate exceeds 1%, the communication line (LTE in this embodiment) whose packet loss rate exceeds 1% is set in the standby mode, so that It was found that the throughput, which is the amount of data communication, can be increased.

  Further, in this embodiment, as shown in FIGS. 6 to 9, when LTE (corresponding to the first communication line) and WiFi (corresponding to the second communication line) are used simultaneously as communication lines, each communication The packet loss rate of the line is monitored, and if the packet loss rate exceeds 0.01%, the communication line (WiFi in this embodiment) with the packet loss rate exceeding 0.01% is set to the standby mode to shorten the communication loss. It was found that throughput, which is the amount of data communication per hour, can be increased.

  As described above, the wireless communication device 2 according to the present embodiment is a wireless communication device that uses MPTCP that bundles a plurality of physical links (first and second communication lines 6 and 7) and handles them as one logical link. is there. Then, in the link aggregation that bundles a plurality of physical links, the wireless communication device 2 monitors at least a packet loss rate in each link of the plurality of physical links, and at least a plurality of physical links monitored by the monitoring unit 23 Communication line stopping means 24 for disabling a link whose packet loss rate exceeds a predetermined threshold or disabling only transmission of MPTCP traffic when one packet loss rate exceeds a predetermined threshold ing.

  That is, in the wireless communication apparatus 2 according to the present embodiment, in the link aggregation in which the monitoring unit 23 bundles a plurality of physical links (first and second communication lines 6 and 7), the packet loss in each link of the plurality of physical links. If the packet loss rate of at least one of the plurality of physical links monitored by the monitoring unit 23 exceeds a predetermined threshold value, the communication line stop unit 24 is monitored. A link whose packet loss rate exceeds a predetermined threshold is invalidated or only transmission of MPTCP traffic is invalidated. For this reason, communication quality can be ensured.

  In the present embodiment, the communication methods of the plurality of physical links (first and second communication lines 6 and 7) used by the wireless communication device 2 are different from each other. For this reason, for example, even if a failure occurs in one communication line, there is less possibility of the same failure occurring in the other communication line, and communication stability is improved and more effective than using the same communication method. Communication quality can be guaranteed.

  In the wireless communication device 2 according to the present embodiment, the predetermined threshold is preferably 5%, more preferably 1%. By setting the predetermined threshold in this way, the threshold of the packet loss rate at which the use of the communication line is stopped is 1%, so that a reduction in the communication speed can be suppressed and the communication quality can be effectively secured.

  The wireless communication method by the wireless communication apparatus 2 according to the present embodiment is a wireless communication method using MPTCP that bundles a plurality of physical links (first and second communication lines 6 and 7) and handles them as one logical link. It is. In the link aggregation in which the plurality of physical links are bundled, the monitoring unit 23 monitors the packet loss rate in each link of the plurality of physical links, and the communication line stop unit 24 is monitored by the monitoring unit 23. When at least one packet loss rate of a physical link exceeds a predetermined threshold, a link having a packet loss rate exceeding the predetermined threshold is disabled (Disable) or only transmission of MPTCP traffic is disabled (Disable). doing.

  That is, in the wireless communication method by the wireless communication device 2 according to the present embodiment, each of the plurality of physical links in the link aggregation in which the monitoring unit 23 bundles the plurality of physical links (first and second communication lines 6 and 7). When the packet loss rate in the link is monitored and at least one packet loss rate of the plurality of physical links monitored by the monitoring unit 23 exceeds a predetermined threshold, the communication line stop unit 24. A link whose packet loss rate exceeds a predetermined threshold is invalidated or only transmission of MPTCP traffic is invalidated. For this reason, communication quality can be ensured.

(Other embodiments)
In addition, this invention is not limited to embodiment mentioned above. That is, those skilled in the art may make various modifications, combinations, subcombinations, and alternatives regarding the components of the above-described embodiments within the technical scope of the present invention or an equivalent scope thereof. For example, in the above-described embodiment, an example in which data is transmitted and received between the wireless communication device 2 such as a smartphone, a tablet terminal, and a mobile PC and the server 3 has been described. However, a wireless communication device such as a smartphone, a tablet terminal, and a mobile PC is described. The present invention can also be applied to the case where data is transmitted and received between the two.

  In the above-described embodiment, the first communication line 6 is a communication line such as 3G, 4G, or LTE (long term evolution), and the second communication line 7 is, for example, WiFi (registered trademark) or the like. The first communication line 6 may be a communication line other than 3G, 4G, and LTE (long term evolution). The second communication line 7 may be a communication line other than WiFi (registered trademark). Further, in the above-described embodiment, the form using two communication lines (first and second communication lines) has been described. However, three or more communication lines may be used.

  In the above embodiment, the wireless communication apparatus 2 includes the monitoring unit 23 and the communication line stop unit 24. However, the server 3 may include the monitoring unit 23 and the communication line stop unit 24. The wireless communication apparatus 2 may be provided with either the monitoring means 23 or the communication line stop means 24, and the server 3 may be provided with the other of the monitoring means 23 or the communication line stop means 24 on the wireless communication apparatus 2 side. . Further, both the wireless communication device 2 and the server 3 may be provided with a monitoring unit 23 and a communication line stop unit 24.

  In the above embodiment, the communication line stopping unit 24 determines that the packet loss rate of the first and second communication lines 6 and 7 is predetermined when the packet loss rate monitored by the monitoring unit 23 exceeds a predetermined threshold. The communication line exceeding the threshold is stopped, and the standby mode is set. However, for the communication line set to the standby mode, the packet loss rate is regularly checked (for example, every predetermined time), and the packet loss rate is If the threshold is not exceeded, the use of the communication line, that is, the standby mode may be canceled.

1 wireless communication system 2 wireless communication device 3 server 4 base station 5 access point 6 first communication line (physical link)
7 Second communication line (physical link)
21 First communication IF
22 Second communication IF
23 monitoring means 24 communication line stopping means 25 control unit

Claims (5)

A wireless communication device using MPTCP that bundles a plurality of physical links and handles them as one logical link,
In link aggregation that bundles the plurality of physical links, monitoring means for monitoring a packet loss rate in each link of the plurality of physical links;
A communication line stopping unit that invalidates a link whose packet loss rate exceeds a predetermined threshold when at least one of the packet loss rates of a plurality of physical links monitored by the monitoring unit exceeds a predetermined threshold; A wireless communication apparatus.   2. The wireless communication apparatus according to claim 1, wherein the communication line stop unit invalidates only the transmission of the MPTCP traffic when the packet loss rate monitored by the monitoring unit exceeds a predetermined threshold. .   The wireless communication apparatus according to claim 1, wherein the plurality of physical links have different communication methods.   The wireless communication apparatus according to any one of claims 1 to 3, wherein the predetermined threshold value is in a range of 0.01% to 1%. A wireless communication method using MPTCP that bundles a plurality of physical links and handles them as one logical link,
A monitoring means for monitoring a packet loss rate in each link of the plurality of physical links in link aggregation in which the plurality of physical links are bundled;
A step of invalidating a link whose packet loss rate exceeds a predetermined threshold when at least one of the plurality of physical links monitored by the monitoring unit exceeds a predetermined threshold when the communication line stop unit exceeds the predetermined threshold; And a wireless communication method.

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