JP6201208B2 - COMMUNICATION DEVICE, PROGRAM, AND COMMUNICATION METHOD - Google Patents

Description

  The present invention relates to a technique for performing wireless communication simultaneously using mutually different wireless communication systems.

  Conventionally, techniques for integrating different wireless media such as a wireless LAN and a mobile phone have been proposed. Patent Document 1 discloses a technology for integrating heterogeneous radio systems having different cell sizes such as a pico cell, a micro cell, and a macro cell by using a cognitive base station and a cognitive terminal. The cognitive base station and the cognitive terminal include a switch, a plurality of wireless modules, and a wireless environment recognition unit. The wireless environment recognition unit recognizes the wireless environment, and based on the recognition result, the link frame is transmitted to the switch. Instructs switching of a wireless module as a distribution destination. The link frame is transmitted / received via the designated wireless module.

  In addition, Patent Document 2 discloses that a wireless resource control method for existing wireless media is not modified, and a plurality of wireless media are integrated by a switch to ensure a transmission rate that satisfies a QoS requirement. A technique for dynamically selecting and communicating with a wireless medium is disclosed so as to avoid communication that must be at a low rate.

JP 2008-085759 A JP 2010-130209 A

  In recent years, in order to perform high-speed communication with a communication device such as a personal computer or a smartphone, a technique for performing communication by bundling a plurality of communication paths has been proposed. When acquiring data using this technology, for example, in communication such as downloading a file, if the communication capability (communication speed) is not taken into consideration, the download time will be dragged to a path with a lower communication speed. It will be late.

  That is, when communication is performed using a plurality of wireless interfaces simultaneously, the difference in the standard of the wireless communication system, the difference in the wireless / communication state of each wireless system at an arbitrary communication location, the path between the client and the server (client-server The difference (delay difference) occurs in the arrival time of the data packet due to the difference in distance. If this delay difference is large, communication with a single wireless system with a small delay time may result in a shorter communication time.

  For example, as shown in FIG. 7A and FIG. 7B, when there are two wireless systems (A, B) having different communication speeds, when half of the data to be acquired is simply downloaded using each wireless system, It is dragged by a wireless system with a low communication speed, and is slower than when all data is downloaded with a wireless system with a high communication speed. As shown in FIG. 7A, the wireless system A has a communication speed approximately three times that of the wireless system B. Therefore, when data is downloaded using only the wireless system B, the wireless system A is downloaded using only the wireless system A. Takes 3 times longer.

  Here, if the data to be transmitted is halved and each is downloaded using the wireless systems A and B, as shown in FIG. 7B, the download time is the time required to complete the wireless system B that takes a long download time. If the total amount of data is downloaded only by the wireless system A, the download is completed earlier.

  The present invention has been made in view of such circumstances, by detecting in real time a communication method in which the data acquisition time is significantly delayed due to changes in the status of the wireless communication path, etc. It is an object of the present invention to provide a communication device, a program, and a communication method that can always acquire data using a wireless communication method having a high communication speed in an arbitrary wireless environment.

  (1) In order to achieve the above object, the present invention takes the following measures. That is, the communication device of the present invention is a communication device having a plurality of wireless communication devices capable of performing wireless communication simultaneously with mutually different wireless communication methods, analyzing a request transmitted from an application, and arbitrarily When there is a request analysis unit that distributes and outputs a request for requesting a determined amount of data and other requests, and communication for each wireless communication method when there is a request for requesting the arbitrarily determined amount of data The range size of the data is determined for each wireless communication method according to the state of the route, the request for requesting the data of the determined range size by a plurality of wireless communication methods at the same time, and the throughput of the communication route of each wireless communication method A request distribution unit that periodically measures the request distribution unit, wherein each of the measured wireless communication systems Grouping a plurality of wireless communication systems into a low-speed communication system group including at least a wireless communication system with the minimum throughput and a high-speed communication system group including at least a wireless communication system with the maximum throughput based on the throughput of the communication path; The first time required to acquire all unacquired data corresponding to the requests made in each wireless communication method included in the low-speed communication method group, and the wireless communication methods included in the high-speed communication method group Acquire all unacquired data corresponding to the request and unacquired data corresponding to the request made in each wireless communication method included in the low-speed communication method group in each wireless communication method included in the high-speed communication method group If the second time is smaller than the second time required to acquire all, the low-speed communication The request by each wireless communication method included in the expression group is stopped, and the unacquired corresponding to the request made in each wireless communication method included in the low-speed communication method group in each wireless communication method included in the high-speed communication method group It is characterized by making a request to acquire data.

  As described above, when the second time is smaller, the request by each wireless communication method included in the low-speed communication method group is stopped and included in the low-speed communication method group in each wireless communication method included in the high-speed communication method group. Since a request for acquiring unacquired data corresponding to a request made in each wireless communication system is made, it is possible to always acquire data using a wireless communication system with a high communication speed.

  (2) Further, in the communication device of the present invention, the request distribution unit is configured to perform the low-speed communication with reference to a point in time when all the data corresponding to the requests made in each wireless communication method included in the high-speed communication method group is acquired. A third time required to acquire all unacquired data corresponding to requests made in each wireless communication method included in the method group, and the low-speed communication method in each wireless communication method included in the high-speed communication method group. Compared with a fourth time required to acquire all unacquired data corresponding to requests made in each wireless communication method included in the group, and when the fourth time is smaller, the low-speed communication Requests by each wireless communication method included in the method group are stopped, and each wireless communication included in the low-speed communication method group in each wireless communication method included in the high-speed communication method group And performing a request to obtain the non-acquisition of data corresponding to the request made by the formula.

  In this way, when the fourth time is smaller, the request by each wireless communication method included in the low-speed communication method group is stopped and included in the low-speed communication method group in each wireless communication method included in the high-speed communication method group. Since a request for acquiring unacquired data corresponding to a request made in each wireless communication system is made, it is possible to always acquire data using a wireless communication system with a high communication speed.

  (3) The communication device of the present invention is a communication device having a plurality of wireless communication devices capable of simultaneously performing wireless communication using mutually different wireless communication methods, and analyzes a request transmitted from an application. A request analysis unit that distributes and outputs a request for requesting an arbitrarily determined amount of data and other requests, and each wireless communication when there is a request for requesting the arbitrarily determined amount of data. The range size of data is determined for each wireless communication method according to the state of the communication path of the method, a request for simultaneously requesting data of the determined range size by a plurality of wireless communication methods is performed, and communication of each wireless communication method is performed. A request distribution unit that periodically measures the throughput of the path, and the request distribution unit includes the measured wireless communication methods. A first time required to acquire all the unacquired first data corresponding to the request made in the first wireless communication method based on the throughput of the communication path of the first and other than the first wireless communication method To acquire all the unacquired second data corresponding to the request made in the second wireless communication method and to acquire all the unacquired first data in the second wireless communication method. When the second time is smaller, the request by the first wireless communication method is stopped, and the unacquired first data is transferred by the second wireless communication method. It is characterized by making a request for acquisition.

  As described above, when the second time is smaller, the request by the first wireless communication method is stopped, and the request for acquiring the first data not acquired by the second wireless communication method is performed. Data can be acquired using a wireless communication method with a high communication speed.

  (4) Further, in the communication device of the present invention, the request distribution unit is configured to use the first wireless communication with reference to a point in time when all the second data corresponding to the request made by the second wireless communication method is acquired. To acquire all of the first data not acquired in the second wireless communication method and the third time required to acquire all the unacquired first data corresponding to the request made in the communication method And when the fourth time is smaller, the request by the first wireless communication method is stopped, and the unacquired first time is obtained by the second wireless communication method. It is characterized by making a request to acquire the data.

  As described above, when the fourth time is smaller, the request by the first wireless communication method is stopped, and the request for acquiring the first data not acquired by the second wireless communication method is performed. Data can be acquired using a wireless communication method with a high communication speed.

  (5) The communication device of the present invention is a communication device having a plurality of wireless communication devices capable of simultaneously performing wireless communication using mutually different wireless communication methods, and the communication path throughput of each wireless communication method. Is periodically measured, and when there is a data request from the communication partner device for each wireless communication method, the data transmitted by each wireless communication method based on the measured communication path throughput of each wireless communication method And a communication control unit for determining the amount of data, wherein the determined amount of data is simultaneously transmitted to the communication partner device by a wireless communication device corresponding to each wireless communication method.

  In this way, since the amount of data determined by the wireless communication device corresponding to each wireless communication method is simultaneously transmitted to the communication partner device, it is possible to always transmit data at a high communication speed.

  (6) Further, in the communication apparatus of the present invention, the communication control unit sets the amount of data to be transmitted by at least a wireless communication method with a minimum throughput to zero.

  As described above, since the amount of data to be transmitted by the wireless communication method with at least the minimum throughput is set to zero, it is possible to avoid the download time being delayed due to being dragged by a path having a low communication speed. .

  (7) Further, in the communication apparatus according to the present invention, the communication control apparatus disconnects a session of a wireless communication scheme having at least a minimum throughput.

  In this way, since the session of the wireless communication method with the minimum throughput is disconnected, it is possible to avoid the download time being delayed due to being dragged by a path with a low communication speed. In addition, useless packets are not transmitted, and it is possible to contribute to improving the throughput of the entire communication system.

  (8) The program of the present invention is a program for a communication device having a plurality of wireless communication devices capable of simultaneously performing wireless communication using mutually different wireless communication methods, and analyzes a request transmitted from an application. When there is a process for distributing and outputting a request for requesting an arbitrarily determined amount of data and other requests, and a request for requesting an arbitrarily determined amount of data, each wireless communication system The range of data is determined for each wireless communication system in accordance with the state of the communication path, and a request for simultaneously requesting data of the determined range size in a plurality of wireless communication systems is made, and the communication path of each wireless communication system Based on the process of periodically measuring the throughput of the communication path and the throughput of the measured communication path of each wireless communication method. A process of grouping wireless communication methods into a low-speed communication method group including at least a wireless communication method having a minimum throughput and a high-speed communication method group including at least a wireless communication method having a maximum throughput, and each of the low-speed communication method groups A first time required to acquire all unacquired data corresponding to a request made by a wireless communication method, and unacquired data corresponding to a request made by each wireless communication method included in the high-speed communication method group And second data required to acquire all unacquired data corresponding to requests made in each wireless communication method included in the low-speed communication method group in each wireless communication method included in the high-speed communication method group. If the second time is smaller than the process of comparing the time of the wireless communication time, each wireless communication included in the low-speed communication method group Processing for requesting to acquire unacquired data corresponding to a request made in each wireless communication method included in the low-speed communication method group in each wireless communication method included in the high-speed communication method group And causing a computer to execute a series of processes.

  As described above, when the second time is smaller, the request by each wireless communication method included in the low-speed communication method group is stopped and included in the low-speed communication method group in each wireless communication method included in the high-speed communication method group. Since a request for acquiring unacquired data corresponding to a request made in each wireless communication system is made, it is possible to always acquire data using a wireless communication system with a high communication speed.

  (9) The program of the present invention is a program for a communication apparatus having a plurality of wireless communication devices capable of performing wireless communication simultaneously with mutually different wireless communication methods, and includes a communication path for each wireless communication method. When there is a request for data for each wireless communication method from a process for periodically measuring the throughput and a communication partner device, each wireless communication method is based on the measured throughput of each wireless communication method. A series of processes including a process for determining the amount of data to be transmitted, and a process for simultaneously transmitting the determined amount of data to the communication partner apparatus using a wireless communication device corresponding to each wireless communication method. The computer is executed.

  In this way, since the amount of data determined by the wireless communication device corresponding to each wireless communication method is simultaneously transmitted to the communication partner device, it is possible to always transmit data at a high communication speed.

  (10) Further, the communication method of the present invention is a communication method of a communication apparatus having a plurality of wireless communication devices capable of simultaneously performing wireless communication with mutually different wireless communication methods, and a request transmitted from an application. If there is a request to distribute and output a request for requesting an arbitrarily determined amount of data and other requests, and a request for requesting the arbitrarily determined amount of data, According to the state of the communication path of the communication method, the range size of the data is determined for each wireless communication method, a request for simultaneously requesting data of the determined range size by a plurality of wireless communication methods is made, and each wireless communication method Periodically measuring the throughput of the communication path, and based on the measured throughput of the communication path of each wireless communication method Grouping a plurality of wireless communication methods into a low-speed communication method group including at least a wireless communication method having a minimum throughput and a high-speed communication method group including at least a wireless communication method having a maximum throughput; and included in the low-speed communication method group First time required to acquire all unacquired data corresponding to requests made in each wireless communication method and unacquired corresponding to requests made in each wireless communication method included in the high-speed communication method group It is necessary to acquire all the unacquired data corresponding to the requests made in each wireless communication method included in the low-speed communication method group in each wireless communication method included in the high-speed communication method group If the second time is smaller than the step of comparing with the second time, it is included in the low-speed communication method group. The wireless communication method is stopped, and unacquired data corresponding to the request made in each wireless communication method included in the low-speed communication method group is acquired in each wireless communication method included in the high-speed communication method group. And at least a step of making a request.

  As described above, when the second time is smaller, the request by each wireless communication method included in the low-speed communication method group is stopped and included in the low-speed communication method group in each wireless communication method included in the high-speed communication method group. Since a request for acquiring unacquired data corresponding to a request made in each wireless communication system is made, it is possible to always acquire data using a wireless communication system with a high communication speed.

  (11) Further, the communication method of the present invention is a communication method for a communication apparatus having a plurality of wireless communication devices capable of simultaneously performing wireless communication using mutually different wireless communication methods. The step of periodically measuring the throughput of the path, and when there is a data request for each wireless communication system from the communication partner device, each wireless communication based on the measured communication path throughput of each wireless communication system At least a step of determining an amount of data to be transmitted by a method, and a step of simultaneously transmitting the predetermined amount of data to the communication counterpart device by a wireless communication device corresponding to each of the wireless communication methods. It is characterized by that.

  In this way, since the amount of data determined by the wireless communication device corresponding to each wireless communication method is simultaneously transmitted to the communication partner device, it is possible to always transmit data at a high communication speed.

  According to the present invention, in an environment where communication quality such as throughput greatly changes with the movement of a client device or a change in a wireless state in a communication path, a communication path whose data acquisition time is greatly delayed is detected in real time. By promptly correcting the data, it becomes possible to always acquire data using a wireless communication method having a high communication speed in any wireless environment.

It is a block diagram which shows schematic structure of the client apparatus as a communication apparatus which concerns on this embodiment. It is a figure which shows the concept of the control in the case of using two types of wireless communication systems. It is a figure which shows the concept of the control in the case of using three types of wireless communication systems. It is a figure which shows the concept of the control in the case of using three types of wireless communication systems. It is a sequence chart which shows operation | movement of the communication apparatus which concerns on this embodiment. It is a figure which shows the mode of the conventional transmission / reception. It is a figure which shows a mode that data are continuously transmitted, without waiting for ACK. It is a figure which shows the operation | movement in the conventional TCP. It is a figure which shows schematic structure of the server apparatus which concerns on this embodiment. It is a figure which shows operation | movement of the server apparatus and client apparatus which concern on this embodiment. It is a figure which shows operation | movement of the server apparatus and client apparatus which concern on this embodiment. It is a figure which shows operation | movement of the server apparatus and client apparatus which concern on this embodiment. It is a figure which shows the communication time in each radio | wireless system. It is a figure which shows the communication time in each radio | wireless system.

  Preconditions (prerequisite environment) for the operation of the communication terminal device according to the present embodiment will be described. The present embodiment is intended for communication such as download and streaming, in which data and a data range are designated from a wireless communication apparatus to acquire a file or the like. The acquisition of a file by designating a range is standardly implemented and used in a WEB server and a streaming server that are generally used at the present time, and in particular, in order to realize the contents of the present embodiment, the server There is no need for side repairs. Here, communication by range specification refers to communication that can be acquired by partially specifying the target file as if it was data from what byte to what byte of the data to be downloaded, etc. It is.

[First Embodiment]
FIG. 1 is a block diagram showing a schematic configuration of a client device as a communication device according to the present embodiment. The client device 100 includes an application unit 1, a request analysis unit 3, a request distribution unit 5, a 3G / LTE interface 7, and a Wi-Fi interface 9. In the present embodiment, two communication interfaces, 3G / LTE interface 7 and Wi-Fi interface 9, will be described as examples. However, the present invention is not limited to this, and three or more different types of wireless communication are used. It is possible to provide communication interfaces for communication methods (Wi-Fi, LTE, WiMAX, etc.).

  The application unit 1 has an application that operates in an application layer such as a browser, for example, and makes a request to the server device via any one of the communication interfaces (wireless communication devices). The request analysis unit 3 analyzes the request generated in the application unit 1 and determines whether or not the request is a request for a service that acquires an arbitrarily determined amount of data such as data download. To analyze. When the request is a request for a service that acquires an arbitrarily determined amount of data, the request is transferred to the request distribution unit 5.

  When a request is generated in the application unit 1, the request distribution unit 5 establishes a TCP / IP (Transmission Control Protocol / Internet Protocol) session simultaneously with the server device using the communication interfaces (7, 9). In addition, a request for requesting an arbitrary amount of range size data is transmitted from the two paths to the acquisition target file requested by the application. The size of the range is set to be smaller than the amount of data to be acquired so that the amount of data that can be handled can be changed following changes in the state of each communication path (change in communication quality, change in usage, etc.) To do. In addition, the request distribution unit 5 periodically measures the throughput of each communication path at an arbitrary timing.

  If the requested request has been completed, but the data of all the files to be acquired has not been acquired yet, the request distribution unit 5 makes a request for acquiring data in an arbitrary range size. At this time, a data acquisition request is made by calculating the range size to the amount that data acquisition is completed at the same time on the two basic communication paths.

  As described above, an optimal amount of data is basically acquired in accordance with a change in the state of the communication path. However, the state of the communication path may change during the acquisition of this data. As a way to avoid this situation, if it is determined that it is faster to re-acquire data that is already in the process of acquisition, based on the throughput measurement that is regularly confirmed and the remaining size that must be acquired. Then, this request is stopped, and on the other hand, control for acquiring data again is performed. This control optimizes communication that takes time to acquire due to changes in the status of the communication path.

  In the present embodiment, the communication protocol operating on the client device is targeted for communication using the transport layer and the network layer using TCP / IP, and the application operating on the application layer is not particularly limited.

  FIG. 2A is a diagram illustrating a concept of control when two types of wireless communication schemes are used. When communication is started, the request distribution unit 5 periodically measures the speed (throughput measurement). Here, it is assumed that the packets 1 and 2 are assigned to be acquired by the wireless communication method A having a high communication speed and the packet 3 is assigned to be acquired by the wireless communication method B having a low communication speed. In wireless communication system A, acquisition of packets 1 and 2 has been completed, but in wireless communication system B, all packets 3 have not been acquired yet. In addition, the time required to acquire all the unacquired packets 3 by the wireless communication method B is longer than the time required to acquire all the unacquired packets 3 by the wireless communication method A after acquiring all of the packets 2. Is also big. Therefore, in this embodiment, the wireless communication method B is canceled and a request for acquiring the packet 3 by the wireless communication method A is made. Here, in the wireless communication method A, only the unacquired packet 3 may be acquired and combined with the acquired data, or the packet 3 may be acquired from the beginning.

  FIG. 2B is a diagram illustrating a concept of control when three types of wireless communication schemes are used. When communication is started, the request distribution unit 5 periodically measures the speed (throughput measurement). Here, it is assumed that the maximum throughput is measured by the wireless communication system A, and a considerably smaller throughput is measured by the wireless communication systems B and C than the wireless communication system A. For example, the throughput of the wireless communication method C with the minimum throughput is set to 1, the throughput of the wireless communication method B is set to 2, and the throughput of the wireless communication method A with the maximum throughput is set to 5. Then, the wireless communication method C with the lowest throughput and the wireless communication method B with the next smallest throughput are grouped into the low-speed communication method group, and the wireless communication method A with the highest throughput is grouped into the high-speed communication method group.

  In order to facilitate understanding, assuming that the same amount of data having a ratio of 10 is assigned to each wireless communication method, the ratio of the time for which the wireless communication method A acquires data A1 is: data amount 10 ÷ speed 5 = time 2, the ratio of the time when the wireless communication method B acquires the data B1 is the data amount 10 / speed 2 = time 5, and the time ratio when the wireless communication method C acquires the data C1 is the data amount 10 / speed 1 = Time 10 is reached.

  If this is the case, the time required to acquire all of the data A1 to C1 will be 10. Therefore, in this embodiment, a request for acquiring the data B1 and the data C1 by the wireless communication method A included in the high-speed communication method group is issued. Do. Then, the requests in the wireless communication systems B and C included in the low-speed communication system group are canceled. As a result, the time required to acquire all of the data A1 to C1 is the data amount 30 / speed 5 = time 6, and all data can be acquired earliest.

  After that, data acquisition using the wireless communication systems B and C may be resumed according to the throughput of each wireless communication system.

  In the above description, the data A1 to C1 are all the same amount of data, but the data amount may be adaptively changed according to the throughput.

  FIG. 2C is a diagram illustrating a concept of control when three types of wireless communication schemes are used. When communication is started, the request distribution unit 5 periodically measures the speed (throughput measurement). Here, it is assumed that the maximum throughput is measured in the wireless communication system A, a considerably large throughput is measured in the wireless communication system B, and a considerably small throughput is measured in the wireless communication system C. For example, the throughput of the wireless communication system C with the minimum throughput is set to 1, the throughput of the wireless communication system B is set to 4, and the throughput of the wireless communication system A with the maximum throughput is set to 6. Then, the wireless communication method C with the lowest throughput is grouped into the low-speed communication method group, and the wireless communication method A with the highest throughput and the wireless communication method B with the next highest throughput are grouped into the high-speed communication method group.

  In order to facilitate understanding, assuming that the same amount of data with a ratio of 12 is assigned to each wireless communication method, the ratio of the time when wireless communication method A acquires data A1 is the data amount 12 ÷ speed. 6 = time 2, the ratio of the time for wireless communication system B to acquire data B1 is the data amount 12 / speed 4 = time 3, and the ratio of the time for wireless communication system C to acquire data C1 is the data amount 12 / speed 1 = Time 12 is reached.

  In this state, since the time required to acquire all the data A1 to C1 is 12, in this embodiment, a request to acquire the data C1 is performed with the wireless communication systems A and B included in the high-speed communication system group. . Then, the request in the wireless communication method C included in the low-speed communication method group is canceled.

  Here, if the data C1 is acquired only by the wireless communication method A, the data amount 24 ÷ speed 6 = time 4 is obtained, and the wireless communication method B becomes longer than the time 3 for acquiring the data B1.

  Therefore, in this embodiment, the data C1 is distributed to the wireless communication systems A and B at a ratio according to the throughput. The wireless communication systems A and B have a throughput ratio of 6: 4. Therefore, the wireless communication system A is assigned a data amount of 48/5 out of the data C1 of the data amount 12, and the wireless communication system B has data. Of C1, a data amount of 12/5 is allocated. As a result, the total amount of time required to acquire all of the data A1 to C1 is 108/5 in the wireless communication method A when the data amount is (data A1 + data C1 × 48/5). / 5 ÷ speed 6 = time 18/5. In the wireless communication system B, the data amount is (data B1 + data C1 × 12/5), which is 75/5, so the data amount is 72/5 ÷ speed 4 = time 18/5, which is the same time as the wireless communication method A It becomes.

  As a result, the time required to acquire all the data A1 to C1 is 3.6, and all data can be acquired earliest in the same time in the wireless communication systems A and B. In this case, it becomes earlier than the time 4 when the data C1 is acquired only by the wireless communication method A.

  After that, data acquisition using the wireless communication method C may be resumed according to the throughput of each wireless communication method.

  In the above description, the data A1 to C1 are all the same amount of data, but the data amount may be adaptively changed according to the throughput.

  FIG. 3 is a sequence chart showing the operation of the communication apparatus according to the present embodiment. First, in the client device, all available communication interfaces are made communicable before requesting a request from an application (step S1). In this operation, the client device detects a connectable base station device, establishes a link, and acquires an IP address. Next, the request analysis unit detects that a request has been transmitted from the application on the client to an arbitrary server (host) (step S2). The request analysis unit analyzes the request, and if it is a request for a service that acquires an arbitrarily determined amount of data such as download, transfers the request to the request distribution unit.

  The request distribution unit establishes a TCP / IP session with the request destination server via a plurality of available wireless paths (step S3). Here, a case where there are two usable communication paths will be described as an example. A request for requesting data of an arbitrary amount of range size from two paths is transmitted to the acquisition target file requested by the application (step S4). The size of the range is set to be smaller than the amount of data to be acquired so that the amount of data that can be handled following the change in the status of each communication path, that is, the change in communication quality, the change in usage status, etc. can be changed And Next, downloading is performed from the host via each communication path (step S5). Further, the request distribution unit periodically measures the throughput of each communication path at an arbitrary timing (step S6).

  When the requested request is completed, but the data of all the files to be acquired has not been acquired yet, the request distribution unit makes a request for acquiring data in an arbitrary range size (step S7). At this time, a data acquisition request is made by calculating the range size to the amount that data acquisition is completed at the same time on the two basic communication paths.

  Here, an optimum amount of data is basically acquired in accordance with a change in the state of the communication path, but the state of the communication path may change during the acquisition of this data. As a way to avoid this situation, if it is determined that it is faster to re-acquire data that is already in the process of acquisition, based on the throughput measurement that is regularly confirmed and the remaining size that must be acquired. Then, this request is stopped, and control is performed to acquire data again on the other side (steps S8 and S9).

  Such control makes it possible to optimize communication that takes time to acquire due to changes in the status of the communication path.

[Second Embodiment]
When communication is performed by link aggregation, there is a case where the entire communication is slowed down due to communication by a wireless communication method (communication interface) having a low communication speed. In the present embodiment, a method for avoiding this problem on the server side will be described. In this embodiment, when the communication of one communication interface is slower than the other and can be determined to have an adverse effect on the performance of the entire communication by any method, the server side transport layer (TCP : Indicates a method to avoid by Transmission Control Protocol.

  FIG. 4A is a diagram illustrating a state of conventional transmission / reception. TCP employs a technique of “confirming that data has arrived at the other party” in order to realize reliable communication. Basically, TCP is designed to send back one ACK packet from the receiving side every time one packet is sent.

  However, since this method is inefficient, a method called “window control” is adopted to improve communication efficiency, and a plurality of TCP packets are continuously transmitted, and efficiency is improved without confirming ACK. Is used. The window has a certain size. Some protocols count the window size by the number of packets or the number of bytes of data. In TCP, the unit is the number of bytes.

  FIG. 4B is a diagram illustrating a state in which data is continuously transmitted without waiting for an ACK. In TCP, data may be continuously transmitted by the size of the window without waiting for ACK. Specifically, the transmission side transmits TCP packets continuously and continuously without waiting for an ACK from the reception side. Then, only one ACK is returned for the data.

  The conventional general data exchange in TCP is as described above. When communication is performed using a plurality of radio interfaces, continuous transmission of TCP by window control even for a radio interface having a low communication speed. May be performed. In this case, because a large amount of data has already been transmitted to the wireless interface with a low communication speed, the one with a high communication speed is already wasted on the network when performing data reacquisition for recovery with the wireless interface. Many packets may flow. As a result, there is a possibility that the communication on the wireless interface side may be delayed inefficiently and slowly as the movement of the entire communication system.

  In order to avoid this, in communication using a plurality of wireless communication methods at the same time, TCP control on the wireless interface side with the lower communication speed is not dependent on the window size, for example, communication on the faster wireless interface side. It is possible to refrain from transmitting a large amount of TCP data, such as setting the speed ratio as an upper limit. As a result, the control of re-acquiring data on the wireless interface side is reduced as much as possible even if the communication speed is high, the communication time can be reduced, and packets that are wasted on the network can be reduced, improving the overall system performance. Is possible.

  FIG. 4C is a diagram illustrating an operation in the conventional TCP. When the communication speed of the wireless I / F-A and the wireless I / F-B is 3 to 1, originally, the TCP data 5 and 6 are faster when acquired by the wireless I / F-A. The window control has already transmitted to the wireless I / F-B, and a useless packet is transmitted. In addition, the re-acquisition operation is inefficient with the wireless I / F-A.

  FIG. 5 is a diagram illustrating a schematic configuration of the server apparatus according to the present embodiment. The server device 200 includes a communication control unit 201, a 3G / LTE interface 202 as a communication interface, and a Wi-Fi interface 203.

  The communication control unit 201 periodically measures the throughput of the communication path of each wireless communication method. Then, when there is a data request for each wireless communication method from the communication partner device, the amount of data transmitted by each wireless communication method is determined based on the measured throughput of the communication path of each wireless communication method. In addition, the communication control unit 201 sets the amount of data to be transmitted by at least the wireless communication method with the minimum throughput to zero. Further, the communication control unit 201 disconnects the session of the wireless communication method with at least the minimum throughput. The 3G / LTE interface 202 and the Wi-Fi interface 203 simultaneously transmit the amount of data determined by the communication control apparatus 201 to the communication partner apparatus.

  6A to 6C are diagrams illustrating operations of the server device and the client device according to the present embodiment. In the present embodiment, TCP data for a wireless interface having a low communication speed is kept to a communication speed difference without being sent a lot. As a result, an optimal request according to the speed of the new wireless I / F is urged from the data receiving side, and useless control such as data re-acquisition and useless data are prevented from flowing through the network and degrading performance.

  Further, as shown in FIG. 6B, when the communication speed of an arbitrary wireless I / F is clearly slower than the other, for example, only 1/10 speed is obtained on the transmission side, the slower wireless I / F Control is made so that no data is transmitted even if a request for data acquisition is received. As shown in FIG. 6C, a wireless I / F session with a low communication speed may be disconnected. As a result, communication via the wireless I / F with the higher communication speed is promoted, and it is possible to prevent data from flowing to the untitled network side and degrading the performance of the entire system.

  As described above, according to the present embodiment, in an environment where communication quality such as throughput greatly changes as a result of movement or change in wireless state, as in wireless communication, the data acquisition time due to changes in wireless conditions, etc. By detecting a line that is significantly delayed in real time and correcting it promptly, the fastest data acquisition can be performed in any wireless environment.

DESCRIPTION OF SYMBOLS 1 Application part 3 Request analysis part 5 Request distribution part 7 3G / LTE interface 9 Wi-Fi interface 100 Client apparatus 200 Server apparatus 201 Communication control part 202 3G / LTE interface 203 Wi-Fi interface

Claims (11)

A communication device having a plurality of wireless communication devices capable of performing wireless communication simultaneously with mutually different wireless communication methods,
A request analysis unit that analyzes a request transmitted from an application, and distributes and outputs a request that requests an arbitrarily determined amount of data and other requests,
When there is a request for requesting an arbitrarily determined amount of data, the range size of the data is determined for each wireless communication method according to the state of the communication path of each wireless communication method, and the data of the determined range size And a request distribution unit that periodically measures the throughput of the communication path of each wireless communication method,
The request distribution unit
Based on the measured communication path throughput of each wireless communication method, a plurality of wireless communication methods are divided into a low-speed communication method group including at least a wireless communication method with the minimum throughput and a high-speed communication including at least the wireless communication method with the maximum throughput. The first time required to acquire all the unacquired data corresponding to the requests made in each wireless communication method included in the low-speed communication method group and the high-speed communication method group Requests made in each wireless communication method included in the low-speed communication method group in each wireless communication method included in the high-speed communication method group and all unacquired data corresponding to the requests made in each wireless communication method are acquired Compared to the second time required to acquire all unacquired data corresponding to
If the second time is smaller, the request by each wireless communication method included in the low-speed communication method group is stopped, and the wireless communication method included in the high-speed communication method group is included in the low-speed communication method group. A communication device that makes a request to acquire unacquired data corresponding to a request made by each wireless communication method. The request distribution unit is performed in each wireless communication method included in the low-speed communication method group with reference to a point in time when all data corresponding to requests made in each wireless communication method included in the high-speed communication method group is acquired. Third time required to acquire all unacquired data corresponding to the request, and requests made in each wireless communication method included in the low-speed communication method group in each wireless communication method included in the high-speed communication method group Compare the 4th time required to acquire all the unacquired data corresponding to
When the fourth time is smaller, the request by each wireless communication method included in the low-speed communication method group is stopped, and the wireless communication method included in the high-speed communication method group is included in the low-speed communication method group. 2. The communication apparatus according to claim 1, wherein a request for acquiring unacquired data corresponding to a request made by each wireless communication method is made. A communication device having a plurality of wireless communication devices capable of performing wireless communication simultaneously with mutually different wireless communication methods,
A request analysis unit that analyzes a request transmitted from an application, and distributes and outputs a request that requests an arbitrarily determined amount of data and other requests,
When there is a request for requesting an arbitrarily determined amount of data, the range size of the data is determined for each wireless communication method according to the state of the communication path of each wireless communication method, and the data of the determined range size And a request distribution unit that periodically measures the throughput of the communication path of each wireless communication method,
The request distribution unit
Based on the measured throughput of the communication path of each wireless communication method, a first time required to acquire all unacquired first data corresponding to a request made in the first wireless communication method, All the unacquired second data corresponding to the request made in the second wireless communication system other than the first wireless communication system is acquired, and the unacquired first data is acquired in the second wireless communication system Compare with the second time it takes to get everything,
When the second time is smaller, the request by the first wireless communication method is stopped, and the request for acquiring the unacquired first data is performed by the second wireless communication method. A communication device. The request distribution unit is based on a point in time when all the second data corresponding to the request made in the second wireless communication method is acquired, and has not yet been acquired corresponding to the request made in the first wireless communication method. Comparing a third time required to acquire all of the first data with a fourth time required to acquire all of the unacquired first data in the second wireless communication method;
When the fourth time is smaller, the request by the first wireless communication method is stopped, and the request for acquiring the unacquired first data is performed by the second wireless communication method. The communication device according to claim 3. A server device that communicates with the communication device according to any one of claims 1 to 4 ,
Periodically measures throughput of the communication path of each radio communication system, from the communication device, upon request of the data for each radio communication system, based on the throughput of the communication path of each radio communication method said measuring, A communication control unit that determines the amount of data to be transmitted in each wireless communication method,
A server device, wherein the predetermined amount of data is simultaneously transmitted to the communication device by a wireless communication device corresponding to each wireless communication method. The server apparatus according to claim 5, wherein the communication control unit sets the amount of data to be transmitted by at least a wireless communication method with a minimum throughput to zero. The server apparatus according to claim 5, wherein the communication control apparatus disconnects a session of a wireless communication method having at least a minimum throughput. A program of a communication device having a plurality of wireless communication devices capable of performing wireless communication simultaneously with mutually different wireless communication methods,
Analyzing the request sent from the application, sorting the request requesting an arbitrarily determined amount of data from the other requests, and outputting,
When there is a request for requesting an arbitrarily determined amount of data, the range size of the data is determined for each wireless communication method according to the state of the communication path of each wireless communication method, and the data of the determined range size A request for requesting multiple wireless communication methods at the same time, and periodically measuring the throughput of the communication path of each wireless communication method,
Based on the measured communication path throughput of each wireless communication method, a plurality of wireless communication methods are divided into a low-speed communication method group including at least a wireless communication method with the minimum throughput and a high-speed communication including at least the wireless communication method with the maximum throughput. A process of grouping into method groups;
A first time required to acquire all unacquired data corresponding to a request made in each wireless communication method included in the low-speed communication method group and a wireless communication method included in the high-speed communication method group Acquire all unacquired data corresponding to the received request and unacquired data corresponding to the request made in each wireless communication method included in the low-speed communication method group in each wireless communication method included in the high-speed communication method group A process of comparing the second time required to acquire all of
If the second time is smaller, the request by each wireless communication method included in the low-speed communication method group is stopped, and the wireless communication method included in the high-speed communication method group is included in the low-speed communication method group. A program for causing a computer to execute a series of processes of performing a request for acquiring unacquired data corresponding to a request made by each wireless communication method. A program of a server device that communicates with the communication device according to any one of claims 1 to 4 ,
Processing to periodically measure the throughput of the communication path of each wireless communication method;
When there is a data request for each wireless communication method from the communication device, based on the measured throughput of the communication path of each wireless communication method, a process for determining the amount of data to be transmitted in each wireless communication method;
A program that causes a computer to execute a series of processes of simultaneously transmitting the predetermined amount of data with a wireless communication device corresponding to each of the wireless communication methods to the communication device. A communication method of a communication apparatus having a plurality of wireless communication devices capable of performing wireless communication simultaneously with mutually different wireless communication methods,
Analyzing the request sent from the application, sorting the request that requests an arbitrarily determined amount of data from the other requests, and outputting,
When there is a request for requesting an arbitrarily determined amount of data, the range size of the data is determined for each wireless communication method according to the state of the communication path of each wireless communication method, and the data of the determined range size Simultaneously requesting a plurality of wireless communication systems, and periodically measuring the throughput of the communication path of each wireless communication system;
Based on the measured communication path throughput of each wireless communication method, a plurality of wireless communication methods are divided into a low-speed communication method group including at least a wireless communication method with the minimum throughput and a high-speed communication including at least the wireless communication method with the maximum throughput. Grouping into method groups;
A first time required to acquire all unacquired data corresponding to a request made in each wireless communication method included in the low-speed communication method group and a wireless communication method included in the high-speed communication method group Acquire all unacquired data corresponding to the received request and unacquired data corresponding to the request made in each wireless communication method included in the low-speed communication method group in each wireless communication method included in the high-speed communication method group Comparing a second time required to obtain all of
If the second time is smaller, the request by each wireless communication method included in the low-speed communication method group is stopped, and the wireless communication method included in the high-speed communication method group is included in the low-speed communication method group. A request for acquiring unacquired data corresponding to a request made by each wireless communication method. A communication method of a server device that communicates with the communication device according to claim 1 ,
Periodically measuring the throughput of the communication path of each wireless communication method;
When there is a data request for each wireless communication method from the communication device, based on the measured throughput of the communication path of each wireless communication method, determining the amount of data to be transmitted in each wireless communication method;
And a step of simultaneously transmitting the predetermined amount of data to the communication device by a wireless communication device corresponding to each of the wireless communication methods.

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