JP6315436B2 - COMMUNICATION DEVICE, PROGRAM, AND COMMUNICATION METHOD - Google Patents

Description

  The present invention relates to a communication device, a program, and a communication method for performing simultaneous communication using a plurality of different communication methods.

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

  Further, Patent Document 2 discloses that a plurality of wireless communication systems are integrated by a switch without modifying a radio resource control system of an existing wireless communication system, and a transmission rate that satisfies a QoS requirement is ensured. A technique for dynamically selecting and communicating with a wireless communication system is disclosed so as to avoid communication that has to be at a low rate.

  Further, Non-Patent Document 1 stores TCP (Transmission Control Protocol) parameters when a wireless LAN terminal leaves the coverage area of a base station, and stores the stored TCP when reentering the coverage area and restarting communication. A technique for resuming TCP operation from parameters is disclosed. Thereby, the TCP operation at the time of resuming communication is started quickly.

JP 2008-085759 A JP 2010-130209 A

2004 Spring National Convention B6-57 “Study on High-Speed TCP Handoff Between Dispersed Wireless LAN Networks”

  In the conventional technology, the data size (data amount) acquired by one request in each wireless communication method is determined according to the throughput measured in the application layer. When determining the data size to be acquired in one request, if the request size is small, the TCP congestion window size is not fully opened, that is, the maximum congestion window size has not yet been reached. However, the data size to be acquired in one request is determined based on the throughput value at that time, and the throughput capability (effective value) of the wireless communication method cannot be correctly reflected, resulting in a result. Therefore, link aggregation is executed at a distribution rate that is not efficient.

  For example, in the prior art, when determining the data size to be acquired in a single request based on the value of throughput, a wireless communication method that first requests a large data size and a wireless communication method that requests a small data size Suppose that there was. These wireless communication systems can acquire data at the same speed. In this case, it is determined that the wireless communication method that has requested a large data size has a high throughput, while the wireless communication method that has requested a small data size has a low throughput. As a result, there is an exponential difference between the measured values of both throughputs. Furthermore, this state continues until one congestion window size is fully opened (until the maximum value of the congestion window size is reached), which causes a delay at the start of communication.

  In Patent Literature 1 and Patent Literature 2, a base station and a terminal equipped with a plurality of radio schemes select an optimum radio scheme for each packet based mainly on radio environment information obtained from the MAC layer and the PHY layer of the radio module. Although a method of selecting and communicating is shown, a control method related to the transport layer (TCP) that controls the amount of packet transmission is not mentioned.

  Non-Patent Document 1 discloses a technique related to handover within the same system, but does not disclose switching between different types of wireless systems. Although TCP control is mentioned, TCP control is only temporarily stopped and then restarted, and TCP parameters are not optimized.

  The present invention has been made in view of such circumstances, and a communication device capable of speeding up communication by performing link aggregation by simultaneously using a plurality of communication links with an optimum required data size, An object is to provide a program and a communication method.

  (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 that can simultaneously communicate with a plurality of different communication methods, and is notified from a plurality of communication devices corresponding to each communication method and a communication partner device. A data size determining unit that determines a data size to be acquired in one request for each communication method based on the congestion window size, and the data size determining unit is determined by the notified congestion window size A value obtained by multiplying the data size by n (n is a constant), a value obtained by multiplying the data size of the request requested last time by m, or a value based on throughput is set as the data size requested in one request. .

  In this way, a value obtained by multiplying the data size determined by the notified congestion window size by n (n is a constant), a value obtained by multiplying the data size of the request requested last time by m, or a value based on the throughput is obtained once. Since the data size requested by the request is used, link aggregation can be performed using a plurality of communication links at the same time with an optimum data size. As a result, communication speed can be increased. Furthermore, by using different scaling factors before and after reaching the maximum congestion window size for the first time, it is possible to determine an appropriate data size according to the execution status of the algorithm for avoiding congestion.

  (2) Further, the communication device of the present invention is a communication device capable of simultaneously communicating with a plurality of mutually different communication methods, a plurality of communication devices corresponding to each communication method, and a communication partner device. When there is a request to acquire data from the communication partner device and a congestion window monitoring unit that determines a congestion window size to be notified to the server, one request is made for each communication method based on the determined congestion window size. A data size determining unit that determines a data size to be acquired in step (b), wherein the data size determining unit determines the data size determined by the determined congestion window size in the communication partner device as n (n is a constant). ) Multiplied value, m times the data size of the last requested request, or a value based on throughput is requested in one request. A data size to, and notifies the data size that is the determined to the communication partner device.

  As described above, in the communication partner apparatus, the data size determined by the determined congestion window size is multiplied by n (n is a constant), the data size of the request requested last time is multiplied by m, or based on the throughput. Since the value is the data size to be requested in one request and the determined data size is notified to the communication partner device, the communication partner device always uses a plurality of communication links with the optimum data size at the same time. Link aggregation can be performed. As a result, communication speed can be increased. In addition, the communication partner device determines the appropriate data size according to the execution status of the algorithm for avoiding congestion by using different scaling factors before and after reaching the maximum congestion window size first. Is possible.

  (3) Further, the program of the present invention is a program for a communication apparatus capable of simultaneously communicating with a plurality of mutually different communication methods, and processing for performing communication with a plurality of communication devices corresponding to each communication method. Based on the congestion window size notified from the communication partner device, a process for determining the data size to be acquired in one request for each communication method, and the data size determined by the notified congestion window size as n A process in which a value obtained by multiplying (n is a constant), a value obtained by multiplying the data size of the request requested last time by m, or a value based on throughput is set as the data size requested in one request, The computer is executed.

  In this way, a value obtained by multiplying the data size determined by the notified congestion window size by n (n is a constant), a value obtained by multiplying the data size of the request requested last time by m, or a value based on the throughput is obtained once. Since the data size requested by the request is used, link aggregation can be performed using a plurality of communication links at the same time with an optimum data size. As a result, communication speed can be increased. Furthermore, by using different scaling factors before and after reaching the maximum congestion window size for the first time, it is possible to determine an appropriate data size according to the execution status of the algorithm for avoiding congestion.

  (4) Further, the program of the present invention is a program for a communication apparatus capable of simultaneously communicating with a plurality of mutually different communication methods, and performs processing with a plurality of communication devices corresponding to each communication method. And a process for determining the congestion window size to be notified to the communication partner apparatus, and a request for acquiring data from the communication partner apparatus, 1 for each communication method based on the determined congestion window size. A process for determining the data size to be acquired in one request, and a value obtained by multiplying the data size determined by the determined congestion window size by n (n is a constant) in the communication partner apparatus, the request requested last time A process of setting a value obtained by multiplying the data size of m by m or a value based on throughput to a data size to be requested in one request; A process of notifying the serial determined data size to the communication partner device, a series of processing, and characterized by causing a computer to execute.

  As described above, in the communication partner apparatus, the data size determined by the determined congestion window size is multiplied by n (n is a constant), the data size of the request requested last time is multiplied by m, or based on the throughput. Since the value is the data size to be requested in one request and the determined data size is notified to the communication partner device, the communication partner device always uses a plurality of communication links with the optimum data size at the same time. Link aggregation can be performed. As a result, communication speed can be increased. In addition, the communication partner device determines the appropriate data size according to the execution status of the algorithm for avoiding congestion by using different scaling factors before and after reaching the maximum congestion window size first. Is possible.

  (5) Further, the communication method of the present invention is a communication method of a communication apparatus capable of simultaneously communicating with a plurality of mutually different communication methods, and performs communication with a plurality of communication devices corresponding to each communication method. A step of determining, based on the congestion window size notified from the communication counterpart device, a step of determining a data size to be acquired in one request for each communication method, and a data size determined by the notified congestion window size A value obtained by multiplying n by n (n is a constant), a value obtained by multiplying the data size of the request requested last time by m, or a value based on throughput is at least the data size requested in one request. And

  In this way, a value obtained by multiplying the data size determined by the notified congestion window size by n (n is a constant), a value obtained by multiplying the data size of the request requested last time by m, or a value based on the throughput is obtained once. Since the data size requested by the request is used, link aggregation can be performed using a plurality of communication links at the same time with an optimum data size. As a result, communication speed can be increased. Furthermore, by using different scaling factors before and after reaching the maximum congestion window size for the first time, it is possible to determine an appropriate data size according to the execution status of the algorithm for avoiding congestion.

  (6) Further, the communication method of the present invention is a communication method of a communication apparatus capable of simultaneously communicating with a plurality of mutually different communication methods, and performs communication with a plurality of communication devices corresponding to each communication method. Performing a step of determining a congestion window size to be notified to the communication partner device, and if there is a request for acquiring data from the communication partner device, based on the determined congestion window size, for each communication method Determining the data size to be acquired in one request every time, and in the communication partner device, a value obtained by multiplying the data size defined by the determined congestion window size by n (n is a constant) is requested last time. The data size that should be requested in one request is a value obtained by multiplying the data size of the request by m or a value based on the throughput. And steps, characterized in that it comprises a step of notifying a data size that is the determined to the communication destination device, at least.

  As described above, in the communication partner apparatus, the data size determined by the determined congestion window size is multiplied by n (n is a constant), the data size of the request requested last time is multiplied by m, or based on the throughput. Since the value is the data size to be requested in one request and the determined data size is notified to the communication partner device, the communication partner device always uses a plurality of communication links with the optimum data size at the same time. Link aggregation can be performed. As a result, communication speed can be increased. In addition, the communication partner device determines the appropriate data size according to the execution status of the algorithm for avoiding congestion by using different scaling factors before and after reaching the maximum congestion window size first. Is possible.

  According to the present invention, it is possible to perform link aggregation using a plurality of communication links simultaneously with an optimal data size. As a result, communication speed can be increased.

It is a figure which shows the time change condition of the congestion window size of TCP. It is a figure which shows schematic structure of the radio | wireless communications system which concerns on 1st Embodiment. It is a figure which shows schematic structure of the radio | wireless communications system which concerns on 2nd Embodiment.

  The present invention measures fluctuations in the TCP congestion window size in link aggregation, determines the data size to be acquired in a single request in link aggregation based on this measurement result, and transmits and receives packets.

  FIG. 1 is a diagram illustrating a temporal change state of a congestion window size of TCP. As shown in FIG. 1, the congestion window size performs a slow start based on the congestion avoidance algorithm, and increases exponentially with the passage of time. Then, after reaching the maximum value (Wmax) for the first time, it changes in a sawtooth shape between the maximum value and the specified value. In FIG. 1, when the data size (packet) acquired by one request is small as indicated by a vertical dotted line, data acquisition ends before the congestion window size reaches the maximum value. This means that the process is terminated without sufficient throughput.

  Therefore, in the present invention, when determining the data size to be acquired by one request for each communication method based on the congestion window size, before the first value of the congestion window size is first reached, instead of the throughput, A value obtained by multiplying the data size determined by the congestion window size by n (n is a constant) is set as the data size requested in one request. Before reaching the maximum value of the congestion window size for the first time, the congestion window size increases exponentially due to the slow start, so that n is a relatively large value. For example, n = 10 can be set. Alternatively, the data amount of the request requested last time is multiplied by m. For example, m = 2.

  On the other hand, after first reaching the maximum value of the congestion window size, the data size to be acquired in one request is determined based on the throughput as in the conventional method.

  Note that if a request for a large data size is made in a wireless communication method with a very low throughput, it takes time to complete the communication, which may reduce the effect of link aggregation. For this reason, in the present embodiment, it is desirable to perform control so that an excessive request is not issued even during slow start execution.

[First Embodiment]
In the first embodiment, a case where the communication device according to the present invention is applied to a client will be described. FIG. 2 is a diagram illustrating a schematic configuration of the wireless communication system according to the first embodiment. The client includes a data size determination unit 1, an LA (link aggregation) execution unit 3, a TCP control unit 5, and a wireless device 7. Here, a case is shown in which a radio device applied to the radio communication system 1 and a corresponding TCP control unit, and a radio device applied to the radio communication system 2 and a corresponding TCP control unit are configured. Note that the present invention is not limited to this. The server also includes a congestion window monitoring unit 9 and a TCP control unit 11 that determine the congestion window size of the client.

  Based on the congestion window size notified from the server congestion window monitoring unit 9, the client data size determination unit 1 determines the data size to be acquired in one request for each wireless communication system (communication method). The data size determination unit 1 makes a single request for a value obtained by multiplying the data size determined by the congestion window size by n (n is a constant) before reaching the maximum value of the congestion window size notified from the server for the first time. The requested data size. Here, for example, n = 10.

  On the other hand, after the data size determination unit 1 first reaches the maximum value of the congestion window size notified from the server, the data size determined by the congestion window size is multiplied by m (m is a constant satisfying m <n). The value is the data size requested in one request. Here, for example, m = 2 can be set.

  The LA execution unit 3 executes link aggregation from each TCP control unit 5 and each wireless device 7 based on the data size of each wireless communication system determined by the data size determination unit 1.

  As described above, according to the first embodiment, it is possible to perform link aggregation using a plurality of communication links simultaneously with an optimal data size. As a result, communication speed can be increased. Furthermore, since different magnifications are used before and after the maximum congestion window size is first reached, it is possible to determine an appropriate data size according to the execution status of the algorithm for avoiding congestion.

[Second Embodiment]
In the second embodiment, a case where the communication apparatus according to the present invention is applied to a server will be described. FIG. 3 is a diagram illustrating a schematic configuration of a wireless communication system according to the second embodiment. The server includes a data size determination unit 13. The client does not determine the data size. About another structure, it is the same as that of 1st Embodiment.

  In the second embodiment, the data size determination unit 13 determines the congestion window size to be notified to the client. Here, when there is a request for acquiring data from the client, the data size to be acquired in one request for each communication method is determined based on the congestion window size determined by the congestion window monitoring unit 9. That is, before the client reaches the maximum value of the congestion window size for the first time, a value obtained by multiplying the data size determined by the congestion window size determined by the congestion window monitoring unit 9 by n (n is a constant) is once. The data size that should be requested in the request. Here, for example, n = 10.

  On the other hand, after the maximum value of the congestion window size is first reached, a value obtained by multiplying the data size determined by the congestion window size determined by the congestion window monitoring unit 9 by m (m is a constant satisfying m <n) is 1 The data size that should be requested in each request. Here, for example, m = 2 can be set. Then, the determined data size is notified to the client.

  As described above, according to the second embodiment, the client can always perform link aggregation using a plurality of communication links at the same time with an optimum data size. As a result, communication speed can be increased. Furthermore, since different magnifications are used at the client before and after the maximum congestion window size is first reached, it is possible to determine an appropriate data size according to the execution status of the algorithm for avoiding congestion. .

  The present invention is particularly effective when the congestion window size is not fully opened, but can also be applied when the congestion window size is fully opened.

DESCRIPTION OF SYMBOLS 1 Data size judgment part 3 LA execution part 5 TCP control part 7 Radio | wireless machine 9 Congestion window monitoring part 11 TCP control part 13 Data size judgment part

Claims (6)

A communication device capable of simultaneously communicating with a plurality of different communication methods,
A plurality of communication devices corresponding to each communication method;
A data size determination unit that determines a data size to be acquired in one request for each communication method based on the congestion window size notified from the communication partner device;
When the data size is before the data size reaches the maximum value of the notified congestion window size for the first time, the data size determining unit determines a data size determined by the notified congestion window size as n (n is a constant). If the data size reaches the maximum value of the notified congestion window size for the first time while the multiplied value is the data size requested in one request, A communication apparatus characterized in that a value obtained by multiplying a data size by m (a constant satisfying m <n) or a value based on throughput is set as a data size requested in one request. A communication device capable of simultaneously communicating with a plurality of different communication methods,
A plurality of communication devices corresponding to each communication method;
A congestion window monitoring unit for determining a congestion window size to be notified to the communication partner device;
When there is a request to acquire data from the communication partner device, based on the determined congestion window size, a data size determination unit that determines a data size to be acquired in one request for each communication method; With
When the data size is before the data size reaches the maximum value of the determined congestion window size for the first time, the data size determination unit determines the data size determined by the determined congestion window size as n (n is a constant). ) The multiplied value is used as the data size to be requested by the communication partner device in one request, while the data size is after the first arrival of the determined maximum congestion window size. The data size of a request that has been requested last time is multiplied by m (a constant satisfying m <n) or a value based on throughput is set as the data size that the communication partner apparatus should request in one request, and the determination is made. The communication apparatus is configured to notify the communication partner apparatus of the data size thus obtained. A communication device program capable of simultaneously communicating with a plurality of different communication methods,
Processing to communicate with a plurality of communication devices corresponding to each communication method;
Based on the congestion window size notified from the communication partner device, processing for determining the data size to be acquired in one request for each communication method;
In a case where the data size is before the maximum value of the notified congestion window size is first reached, a value obtained by multiplying a data size determined by the notified congestion window size by n (n is a constant) is 1 If the data size is after the first reaching the maximum value of the notified congestion window size, the data size of the previously requested request is set to m (m < a value based on constant) multiplied by the value or throughput satisfy n, a process of the data size to be requested in a single request, a series of processing, a program for causing a computer to execute. A communication device program capable of simultaneously communicating with a plurality of different communication methods,
Processing to communicate with a plurality of communication devices corresponding to each communication method;
A process for determining a congestion window size to be notified to the communication partner apparatus;
When there is a request to acquire data from the communication partner apparatus, based on the determined congestion window size, a process of determining a data size to be acquired in one request for each communication method;
The value if a prior, that the data size n defined by the determined congestion window size (n is a constant) multiplied by said data size reaches a first maximum value of the determined congestion window size, wherein When the communication partner apparatus sets the data size to be requested in one request, but the data size is after the first reaching the maximum value of the determined congestion window size , A process in which a value obtained by multiplying the data size by m (a constant satisfying m <n) or a value based on the throughput is set to a data size that the communication partner apparatus should request in one request;
A program for causing a computer to execute a series of processes including a process of notifying the communication partner apparatus of the determined data size. A communication method of a communication device capable of performing simultaneous communication with a plurality of different communication methods,
Communicating with a plurality of communication devices corresponding to each communication method; and
Determining the data size to be acquired in one request for each communication method based on the congestion window size notified from the communication partner device;
In a case where the data size is before the maximum value of the notified congestion window size is first reached, a value obtained by multiplying a data size determined by the notified congestion window size by n (n is a constant) is 1 If the data size is after the first reaching the maximum value of the notified congestion window size, the data size of the previously requested request is set to m (m < a constant satisfying n) and a value based on the throughput or a value based on throughput at least as a data size requested in one request. A communication method of a communication device capable of performing simultaneous communication with a plurality of different communication methods,
Communicating with a plurality of communication devices corresponding to each communication method; and
Determining a congestion window size to notify the communication partner device;
Determining a data size to be acquired in one request for each communication method based on the determined congestion window size when there is a request to acquire data from the communication partner device; and
The value if a prior, that the data size n defined by the determined congestion window size (n is a constant) multiplied by said data size reaches a first maximum value of the determined congestion window size, wherein When the communication partner apparatus sets the data size to be requested in one request, but the data size is after the first reaching the maximum value of the determined congestion window size , A value obtained by multiplying a data size by m (a constant satisfying m <n) or a value based on throughput is set as a data size that the communication counterpart apparatus should request in one request;
And a step of notifying the communication partner apparatus of the determined data size.

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