JP5190676B2 - Communication network system, network communication method, and network management apparatus - Google Patents

Description

  The present invention relates to a communication network system in which communication terminals communicate with each other while dynamically reconfiguring the presence / absence or connection method of a plurality of wired or wireless communication networks, a communication method thereof, and a network management device. TECHNICAL FIELD OF THE INVENTION

  Various wireless access systems such as mobile phones, wireless LANs, and PHSs have become widespread, and wireless MAN services such as WiMAX (Worldwide Interoperability for Microwave Access) are about to be started.

  In order to effectively use such an access system, research and development of a technique for seamlessly handing over a heterogeneous wireless network has been performed (see Non-Patent Documents 1 and 2).

  Also, as disclosed in Non-Patent Document 3, software radio technology that can be connected to different radio interfaces in order to switch between different radio systems has been studied.

  Based on these technologies, it becomes possible to use limited radio resources (frequency, radio infrastructure) and network resources more efficiently by switching to an optimum one according to the situation of the radio network. This also improves total throughput and capacity, leading to improved frequency utilization efficiency.

It is possible for the user to always communicate with the optimum wireless access. For example, it is possible to communicate with a mobile phone that supports high-speed movement while moving, and to automatically switch to communication via a wireless LAN via an inexpensive Internet line when returning home.
Non-Patent Document 4 discloses a cognitive wireless cloud proposed by the present applicant. In the cognitive wireless cloud, cognitive wireless terminals that can be connected to various types of networks with multiple wireless access means autonomously collect network information that can be used on the spot, and each wireless access and network It is a cognitive radio architecture that acquires QoS information in real time and optimizes the capacity and error rate of the entire network.

  Considering an environment in which a large number of radios exist, the total capacity increases when there is an optimal state where there is a complex system as a whole network including terminals. As a result, the bit rate per frequency is improved, leading to an improvement in frequency utilization efficiency.

A cognitive radio network can be said to be a technique for forming such an optimal state while switching between different types of radio.
Conventionally, when collecting measurement information of wireless systems and changing settings from a management device, functions and information specialized for each wireless system have been used. Therefore, an apparatus developed for each wireless system or network administrator is used as an apparatus for integrated management of wireless access systems having different communication methods and management methods.

  Therefore, the functions in the devices are different, and the interface between the devices cannot be shared. For these reasons, it has been difficult to develop a general-purpose device that manages reconfiguration of different types of wireless access devices.

  As an example, IEEE 802.21 (see Non-Patent Document 5) formulates specifications for realizing handover independent of the type of radio, and has a function of controlling handover by absorbing the type of radio. Have. However, these relate to connection and disconnection of wireless links and collection of wireless information, and are not intended to optimize the wireless access network.

  Similarly, the present applicants are studying as a technique for collecting wireless information. For example, Non-Patent Document 6 is a technique for recognizing a network that can be autonomously used by a terminal, and Non-Patent Document 7 is a technique for acquiring each network QoS information in real time. Non-Patent Document 8 is disclosed as a technique for performing efficient radio resource reservation.

  As a related patent document, there is Patent Document 1 which discloses a software radio communication apparatus. This software-defined radio communication device converts the received radio wave from analog to digital once with an AD converter and performs demodulation, etc. with a digital signal processor or microprocessor and software, so it supports multiple frequencies and radio systems by switching software can do.

Patent Document 2 discloses an existing wireless communication system in which a database device that holds information on the usage status of a wireless channel is connected to each base station included in each wireless access network, and the database device is integrated on each base station side. A cognitive communication system in which a database device having a database of frequencies used by an access network is installed is disclosed.
In order to integrate and manage wireless access devices with different communication methods and management methods, common functions and communication interfaces between different devices are required. However, in the prior art, such a function is realized by a device specially developed for a wireless system. The functions in the device are different and the interface between the devices is not shared. There is a problem that equipment cannot be developed.

G. Wu, P.M. Haveninga and M.M. Mizuno, “MIRAI Architecture for Heterogeneous Networks,” IEEE Comm. Mag. , Pp. 126-134, 2002 M.M. Inoue, K .; Mahmud, H.M. Murakami, M .; Hasegawa and H.H. Morikawa, “Novel Out-Of-Band Signaling for Seawaters Interworking between Heterogeneous Networks,” IEEE Wireless Commun. , Vol. 11, no. 2, pp. 56-63, 2004 H. Harada, “Software Defined Radio Prototype Tower Cognitive Radio Communication Systems,” IEEE dyspan 2005, Vol. 1, pp. 539-547, 2005 Masahiro Kuroda, Yoshitoshi Murata, Hiroshi Harada, Shuzo Kato, “Cognitive Wireless Cloud (1) -Architecture-,” IEICE Technical Report, Software Radio Study Group, March 2007 IEEE P802.21 D8.0, http: // www. iee802. org / 21 / Tsuyoshi Miyamoto, Kentaro Ishizu, Mikio Hasegawa, Yoshitoshi Murata, “Cognitive Wireless Cloud (2) -Data Collection Method for Radio Resource Discovery-”, Shingaku Techniques, Software Radio Study Group, March 2007 Yoshiaki Saito, Mikio Hasegawa, Yoshitoshi Murata, “Cognitive Wireless Cloud (3)-High-speed end-to-end QoS measurement system-,” IEICE Technical Report, Software Radio Society, March 2007 H. N. Tran, M.M. Hasegawa, Y. et al. Murata, “Resource Research Scheme for Mobile Users in Cognitive Wireless Cloud,” Science Technique, Software Radio Study Group, March 2007 JP 2003-152732 A JP 2007-184850 A

  The present invention was created in view of the above-described problems of the prior art, and in different wired or wireless communication network systems, the communication terminal dynamically re-establishes the connection status and connection method with each communication network. It aims at providing the technique for performing communication, comprising.

  In order to solve the above problems, the present invention provides the following communication network system.

  That is, according to the first aspect of the present invention, there is provided a communication network system in which communication terminals communicate with each other while dynamically reconfiguring the presence or absence of connection with a plurality of wired or wireless communication networks. In the following embodiments, the presence / absence of connection and the switchable connection method are collectively referred to as a connection method or the like.

In the communication network system, the communication network side includes a plurality of communication networks configured physically or logically, a connection policy information table stored in a storage unit, and at least communication network information based on the connection policy information. Communication network reconfiguration management means for selecting a connection method and the like, and communication network reconfiguration executing means for reconfiguring the connection to the selected connection method and the like.
Then, the communication network reconfiguration management means uses the request condition information input from the input means regarding the predetermined communication parameter in the communication network or stored in the storage means, and from the request condition information as a conversion condition in advance. A connection policy information generation unit that generates the connection policy information table using the correlation between the defined request condition information and the connection policy information is provided.
The above-mentioned predetermined communication parameters are communication speed, communication volume, line load, packet loss rate, communication delay, jitter, radio wave intensity, communication fee, or values calculated from these parameters according to predetermined formulas. , Or a combination thereof.

  On the other hand, for the communication terminal, terminal reconfiguration management means for selecting a connection method on the communication terminal side in cooperation with the communication network reconfiguration management means, and terminal reconfiguration execution for reconfiguring the connection to the selected connection method, etc. Means.

  The connection method of the present invention includes a frequency and modulation method used for communication, WiFi (Wireless Fidelity, IEEE 802.11b compatibility standard) and WiMAX (World wide Interoperability Access, 802.16 standard). Including methods. The target of reconfiguration includes a band to be used and a level for guaranteeing communication quality. Thus, the reconfiguration of the present invention can also be applied to arbitrary settings and parameter changes between the communication terminal and the network.

  According to the second aspect of the present invention, the connection policy information generation unit selects a link aggregation that is a combination of the communication networks to be linked, and stores the result in a connection policy information table. To do.

  According to the third aspect of the present invention, as the above requirement information, a subjective evaluation value that is a value evaluated by a human with respect to the communication quality of an application, and satisfaction regarding the communication of the user for each user of the communication terminal And a correlation graph of at least the subjective evaluation value and the user satisfaction is stored as a conversion condition, and the connection policy information generation unit includes the subjective evaluation included in the requirement condition information based on the correlation graph A connection policy information table that satisfies both the value and the satisfaction level of the user is generated.

  According to the invention described in claim 4, the communication network measurement information collecting means for extracting at least one of the communication parameters from each communication network is provided on the communication network side. The communication network reconfiguration management unit includes a connection policy information evaluation unit that evaluates the content of the connection policy information table based on the information collected by the communication network measurement information collection unit, and the connection policy information generation unit includes: The connection policy information table is updated according to the evaluation.

  Here, the communication network side refers to any component other than the communication terminal in the communication network system.

  According to the invention described in claim 5, the communication network side is provided with a frequency measuring means for measuring the frequency usage status by each communication network, and the connection policy information generating unit is configured according to the frequency usage status, The connection policy information table is updated.

  According to a sixth aspect of the present invention, the communication terminal further comprises terminal measurement information collecting means for extracting information on at least one of the communication parameters from the communication network to be communicated, and the connection policy information evaluation unit includes the terminal The content of the connection policy information table is evaluated based on the information collected by the measurement information collecting means.

The present invention can also be provided as a network management device.
That is, according to the invention described in claim 7, the communication terminal communicates while dynamically reconfiguring the presence / absence of connection to a plurality of wired or wireless communication networks or a connection method (hereinafter referred to as a connection method). A network management apparatus in a communication network system is provided.

In a configuration using a physical or logical communication network, the apparatus selects a connection policy information table stored in the storage means and a connection method of the communication network based on at least the connection policy information. Reconfiguration management means, and communication network reconfiguration execution means for reconfiguring the connection to the selected connection method or the like.
Further, the communication network reconfiguration management means uses the request condition information input from the input means regarding the predetermined communication parameter in the communication network or stored in the storage means, and from the request condition information as a conversion condition in advance. A connection policy information generation unit that generates the connection policy information table using the correlation between the defined request condition information and the connection policy information is provided.
The above-mentioned predetermined communication parameters are communication speed, communication volume, line load, packet loss rate, communication delay, jitter, radio wave intensity, communication fee, or values calculated from these parameters according to predetermined formulas. , Or a combination thereof.

According to invention of Claim 8, in a connection policy information generation part,
A link aggregation which is a combination of the communication networks to be linked is selected, and the result is stored in a connection policy information table.

  According to the ninth aspect of the present invention, a subjective evaluation value that is a value evaluated by a human with respect to the communication quality of an application as the requirement condition information, and satisfaction regarding the communication of the user for each user of the communication terminal And a correlation graph of at least the subjective evaluation value and the user satisfaction is stored as a conversion condition, and the connection policy information generation unit includes the subjective evaluation included in the requirement condition information based on the correlation graph A connection policy information table that satisfies both the value and the satisfaction level of the user is generated.

  According to the invention described in claim 10, the present network management apparatus comprises communication network measurement information collecting means for extracting information on at least one of the communication parameters from each communication network, and the communication network reconfiguration management means described above. Includes a connection policy information evaluation unit that evaluates the contents of the connection policy information table based on information collected by the communication network measurement information collection unit.

  Further, the connection policy information generation unit updates the connection policy information table according to the evaluation.

  According to the invention described in claim 11, the network management device includes a frequency measuring unit that measures a frequency usage state by each communication network, and the connection policy information generation unit is configured to change the frequency usage state according to the frequency usage state. The connection policy information table is updated.

As described in claim 12, the present invention can also be provided as a single communication terminal.
The present invention can also provide the following network communication method.

That is, according to the invention described in claim 13, there is provided a network communication method in which a communication terminal communicates while dynamically reconfiguring a connection method with a plurality of wired or wireless communication networks. The connection policy information generation unit of the communication network reconfiguration management unit on the communication network side uses the request condition information that is input from the input unit or stored in the storage unit with respect to the communication parameter of A connection policy information generation step for generating a connection policy information table using the correlation between the request condition information defined as the conversion condition and the connection policy information, and the communication network reconfiguration management means are stored in the connection policy information table stored in the storage means. Select the communication network connection method based on the included connection policy information. A communication network selection step, a terminal side communication network selection step in which the terminal reconfiguration management means of the communication terminal selects a connection method with the communication network, etc., triggered by a notification from the communication network reconfiguration management means, execution of communication network reconfiguration The communication network reconfiguration execution step for reconfiguring the connection to the selected connection method or the like, and the terminal reconfiguration execution step for the terminal reconfiguration executing means to reconfigure the connection to the selected connection method or the like It is characterized by having.
The predetermined communication parameter is a communication speed, communication volume, line load, packet loss rate, communication delay, jitter, radio wave intensity, communication charge, or a value calculated by a predetermined calculation formula from the values of these parameters. One or a combination thereof may be used.

  According to the invention described in claim 14, in the connection policy information generation step, link aggregation which is a combination of the communication networks to be linked is selected, and the result is stored in the connection policy information table. To do.

  According to the invention described in claim 15, as the requirement condition information, a subjective evaluation value that is a value evaluated by a human with respect to the communication quality of the application, and a satisfaction degree related to the communication of the user for each user of the communication terminal And storing at least a correlation graph between the subjective evaluation value and the user satisfaction as the conversion condition, and in the connection policy information generation step, the subjective evaluation value included in the request condition information and the user's A connection policy information table that satisfies both satisfaction levels is generated.

  According to the invention described in claim 16, in the network communication method, after the terminal reconfiguration execution step, communication network measurement information collecting means provided on the network side receives information on at least one of the communication parameters from each communication network. Communication network measurement information collecting step for extracting communication network reconfiguration management means, wherein the connection policy information evaluation unit evaluates the contents of the connection policy information table based on information collected by the communication network measurement information collection means The information evaluation step and the connection policy information generation unit include a connection policy information table update step for updating the connection policy information table according to the evaluation.

The present invention has the following effects by providing the above configuration.
That is, in different wired or wireless communication network systems, the connection policy information is provided in the network management device on the network side and the connection method is reconfigured so that the communication terminal can determine whether or not to connect to each communication network. Communication can be performed while dynamically reconfiguring.
As a result, it is possible to provide a communication method that improves the communication cost and performance of the communication terminal and increases the user satisfaction.
In addition, it contributes to effective utilization of resources in the entire network, in particular, effective utilization of frequency resources.

  The present invention also contributes to providing a general-purpose device that can be used in common when managing and controlling a communication network to reconfigure it to an optimum state.

Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings. The embodiment is not limited to the following.
The communication network system of the present invention targets both wired and wireless networks, and communication terminals communicate in either or a mixed environment. And, for the purpose of improving frequency utilization efficiency, load distribution of network traffic, communication quality required by users and applications, etc. by integrating different types of communication networks and dynamically reconfiguring them Yes.

  In order to use the optimal communication network while the communication terminal moves, the use in the wireless network is particularly effective. In the following, the configuration in the wireless network is mainly described, but the present invention is also used in the wired network. Can do.

Here, the architecture of the wireless network according to the present invention is called a cognitive wireless cloud. The cognitive wireless cloud is described in detail in Non-Patent Document 9, but an outline will be described within a necessary range as a premise of the present invention.
H. Harada et al. , “A Software Defined Cognitive Radio System,” IEEE Globecom 2007, November 2007.

  The cognitive wireless cloud is a wireless network architecture in which a plurality of wireless systems having different characteristics are set and switched autonomously and distributed in a terminal according to a user policy. This provides scalable network control and optimization, maximizes available wireless access and improves frequency utilization efficiency.

  FIG. 1 shows the architecture of CWC. On the network side, a plurality of radio access networks (RAN: Radio Access Network) (11) are connected to the IP network (10). RAN (11) is a unit of a network related to a single radio technology including an access point and a base station.

The connection interface to the IP network (10) needs to be IP, but the inside of the RAN (11) does not need to be IP. The IP network (10) has a cognitive network manager (CNM) (12), which can be functionally decomposed into a global GCNM (121) and a local LCNM (122) (non-patented) Reference 10).
H. Murakami et al. , “Research on User-distributed Distributed Resource Management for Cognitive Wireless Clouds-(6) Hierarchical Architecture for Cognitive Era

  The GCNM (121) exists in the IP network (10), but the LCNM (122) exists in the IP network (10) (configuration of 122a) and in the RAN (configuration of 122b and 122c). Two configurations are possible.

  On the other hand, the terminal (13) has a cognitive terminal manager (CTM) (131), and all communication between the network and the terminal is performed between the CNM (12) and the CTM (131). become.

  A network statistics monitor (NSM: Network Statistics Monitor) (14), a RAN statistics information monitor (RSM: RAN Statistics Monitor) (111), and a terminal statistics information monitor (TSM: Terminal Statistics Monitor) (132) are respectively a network and a RAN. Measure information related to network quality at the terminal, or calculate it as statistical information and process it into useful information.

With the above architecture, we aim to realize the following scenario.
First, many other terminals are connected to the access point, and when the terminal is congested, the terminal recognizes the congestion and moves to another access point so that communication can be continued.

  Also, when using applications such as video that require a wide band, connections to a plurality of access points are aggregated to secure the band. Even if the terminal moves, the access point to be aggregated is changed as appropriate so that communication can be continued.

When a large number of terminals exist in an area and access points in the area are congested, the network manager can recognize the congestion and can reduce the congestion by expanding radio resources. At this time, the network can be automatically reconstructed even if a commercially available access point having no special function is connected to the network.
Furthermore, when a problem occurs in a certain access point, the network administrator can recognize the problem.

  The present invention is a technology that contributes to the third point, that is, network reconstruction, and is an important elemental technology that supports the architecture of the cognitive wireless cloud.

  FIG. 2 is a block diagram of the network management device (20) provided on the network side in the present invention. In the present invention, it is not always necessary to provide the network management device (20) as a single server device. A communication network reconfiguration management means (211), which will be described later, can be connected to any server device installed on the network. Configuration executing means (212) may be provided. Each means (211) (212) may be arranged in another server device.

  In this embodiment, this apparatus is provided as the CNM (12) shown in FIG. Here, the LCNM (122) provided for each of the GCNM (121) and the RAN (10) can be distinguished by the action of each processing unit in each means (211) (212). Will not be described separately.

  The network management device (hereinafter referred to as this device) (20) can be easily realized by a well-known personal computer, server computer or the like, and has a CPU (21) for executing processing in cooperation with a memory (not shown) and network connection. The network adapter (22), the keyboard (23) and other input means, and the hard disk (24) and other external storage means are provided.

The network adapter (22) includes a network card that is connected to the Internet and the like, a network card that is connected to a communication terminal by wire or wirelessly, and the like. As a communication protocol, IP (Internet Protocol) used on the Internet is generally used, but is arbitrary.
The network adapter (22) may include an antenna in a wireless network and may include a known device according to the network.

Since the present invention is characterized by performing communication while switching between a plurality of communication networks or changing different communication methods such as communication speed and communication protocol, the network adapter (22) is at least either physical or logical. It can cope with a plurality of different communication networks.
The CPU (21) realizes two processing means, that is, a communication network reconfiguration management means (211) and a communication network reconfiguration execution means (212).

  The former (211) includes a network control unit (211a) that instructs execution of network reconfiguration based on connection policy information, and a connection policy information generation unit (211b) that generates connection policy information.

  The latter (212) includes a network reconfiguration execution processing unit (212a) that performs connection / disconnection to / from a communication network, a connection parameter setting change, and the like according to a command from the network control unit (211a).

  The hard disk (24) stores a connection policy information table (241) and request condition information (242) referred to by the connection policy information generation unit (211b). Note that the requirement condition information (242) can be directly input by the user from the keyboard (23), and need not be provided.

Next, the configuration of the communication terminal (30) in the present invention is shown in FIG.
The communication terminal (30) can be composed of, for example, a portable information terminal such as a mobile phone terminal or a PDA in addition to a personal computer.

The communication terminal (30) also includes a CPU (31) and a network adapter (32).
The CPU (31) includes a terminal reconfiguration management unit (311) corresponding to the communication network reconfiguration management unit (211) and a terminal reconfiguration execution unit (312) corresponding to the communication network reconfiguration execution unit (212). With.

  The operations of the terminal control unit (311a) in the terminal reconfiguration management unit (311) and the terminal reconfiguration execution processing unit (312a) in the terminal reconfiguration execution unit (312) also correspond to the network management device (20). Specific operations will be described later.

  Similarly to the above, the network adapter (32) can correspond to a plurality of communication networks. For example, it corresponds to a physically different network such as a wireless LAN and a mobile phone line, or a plurality of networks different in a logical layer such as different communication bands and communication protocols in the mobile phone line.

In the present invention, the processing shown in FIG. 4 is performed using the network management device (20) on the network side and the communication terminal (30), and the communication network connecting the two.
First, the connection policy information generation unit (211b) of the communication network reconfiguration management unit generates connection policy information with reference to the request condition information (242). (S10)

Next, the network control unit (211a) selects a communication network based on the connection policy information (241). (S11)
The selected communication network is notified to the terminal control unit (311a) of the terminal reconfiguration management means (311) via the network that is currently communicating or a communication network for transmitting a control signal.

  Then, the network reconfiguration execution processing unit (212a) receiving the command from the network control unit (211a) executes the reconfiguration of the communication network (S13), and the communication network in which the terminal control unit (311a) is notified almost simultaneously. By performing the selection control, the terminal reconfiguration execution processing unit (312a) executes terminal reconfiguration (S14).

  The NSM (14) and RSM (111) in FIG. 1 can be provided with known measuring means separately from the apparatus (20), but are provided in the apparatus (20) as shown in FIG. May be.

  That is, the main functions of NSM (14) and RSM (111) are implemented as communication network measurement information collection means (50), and the measurement information collection unit (51) collects information and necessary data based on the collected information. Performs arithmetic processing to convert to.

In the present invention, the effective use of frequency resources is an important object, and a frequency measurement unit (52) for measuring the frequency utilization state may be provided. The frequency measurement unit (52) detects the degree of communication and the degree of radio wave interference at each frequency by analyzing the power at each frequency and the content being communicated.
In the following, it will be handled together with the measurement result of the measurement information collection unit (51).
In any configuration, sensors and the like necessary for acquiring information are arranged separately. A known technique may be arbitrarily used as the individual method of acquiring the statistical value.

  Similarly, the TSM (132) may be provided outside the communication terminal (30), or a terminal measurement information collecting means (60) is provided in the communication terminal (30) as shown in FIG. (61) may collect and calculate communication parameter values on the terminal side.

The basic configuration and processing method of the present invention are as described above. Next, details of each process will be described.
First, the connection policy information generation process (S10) will be described. In this process (S10), connection policy information that determines which communication network is to be reconfigured in consideration of the request condition information (242) that is the priority specified by the user is generated. In the present invention, the connection policy information can be improved from the evaluation of the communication state when the communication is actually performed. This will be described as another embodiment.

The request condition information (242) and connection policy information (241) are defined with respect to communication parameters. We examined what communication parameters should be used.
In wired networks, the balance between available bandwidth and cost is not as significant as in wireless networks, so the requirements are particularly problematic in wireless networks. The following discussion will focus on the requirements necessary for radio resource selection, but many of them are also applicable to the selection of wired resources.

The five requirements of wireless information are: (1) wireless information, (2) communication quality, (3) stability, (4) cost, and (5) power consumption of the terminal.
(1) Radio information (RF)
In order for a terminal to use a radio resource, the terminal must first be within the coverage area of the radio resource. To determine which radio resources are available when a certain terminal is in a certain position, a method in which the terminal itself scans and searches and a method to obtain information from the network can be considered. In this system, these two methods are appropriately used. Can be used together.
As the former method, it is convenient that the terminal control unit (311a) obtains signal input information from the network adapter (32) of the communication terminal (30) and notifies the apparatus (20).
In the latter method, the CNM (12) that covers a plurality of RANs (11) only needs to have information on the coverage area of each RAN. For example, if the information is stored in the hard disk (24) of the apparatus (20). Good. This method is considered to be more effective when the target frequency range is wide and it is difficult to predict which radio resources can be used.

(2) Communication quality (End-to-end QoS)
Since the required communication quality differs depending on the application to be used, more detailed QoS information is required in addition to the binary information such as whether connection is possible as described in (1). Examples of the QoS information include delay, jitter, loss rate, and usable bandwidth.

  In particular, if a new terminal interrupts a congested radio resource, it will adversely affect the communication quality of other terminals that have already used that radio resource, so how much bandwidth the new terminal can use It is thought that it is important to be able to estimate accurately in advance.

  This usable bandwidth information becomes necessary information to achieve the purpose of this system that improves the frequency utilization efficiency by distributing the load of the entire network.

(3) Stability In wireless communication whose communication quality fluctuates dynamically, not only the instantaneous QoS information described in (2) but also its stability is an important parameter. For example, it may be desirable that the wireless resource is more stable than a radio resource that can temporarily use a wide band, even if the band is narrow.

  As a specific example, it is considered that there is a request to reduce the number of switching as much as possible when communication is continued by repeatedly switching radio resources as the user moves.

  For this purpose, it is effective to estimate the time that the radio resource can be used continuously.

(4) Cost It is considered that priority may be given to a lower communication fee than QoS guarantee depending on the user or application. From the viewpoint of user satisfaction, the communication fee is also an important parameter for radio resource selection.

(5) Power consumption of the terminal When using the wireless communication, if the battery of the terminal runs out, no further communication is possible. Therefore, how much power is required for the communication when selecting the wireless resource. It is also an important factor.

  First, one or more of these requirements are used as user requirements. Specifically, the priority order for each request condition can be defined by the user inputting from the keyboard (23). Alternatively, it may be alternatively selected as “cost-oriented” or “communication quality-oriented”.

  Further, the request condition may be automatically defined by the application being used. For example, when an application requiring high-speed communication such as image transmission is started by the user, a process of automatically changing the setting of the requirement condition information (242) to “communication quality emphasis” may be implemented.

  Next, what kind of communication parameter should be used to determine the connection policy information will be described. Information that can be acquired in accordance with the above requirements (1) to (5) is as follows.

(1) Radio information (1-1) Radio type First, radio type information is essential. Communication is not possible unless the communication terminal (30) has the ability to modulate and demodulate the type of radio. This is well known by the action of the network adapter (32) and the like.
(1-2) Received Signal Strength Indicator (RSSI)
This is information for estimating communication quality. Depending on the type of radio, other parameters such as BER (Bit Error Rate) may be used. Also for these, the TSM (132) can be acquired based on information from the network adapter (32) by a known technique.

(2) Communication quality (End-to-end QoS)
(2-1) Delay, Communication Delay Time (2-2) Jitter (2-3) Loss Rate The above three items are essential information for ensuring service quality. The required QoS level differs depending on the type of application. These can be measured and calculated using techniques known to NSM (14), RSM (111), and TSM (132).

(2-4) Access Point Bandwidth This is a value specific to the access point. (1-1) A value derived from the type of radio.
(2-5) Available Bandwidth Dynamic information that changes depending on the usage status of other terminals of the access point.
(2-6) Number of terminals connected to access point This is an index indicating the degree of congestion of the access point. It may be difficult to measure the free bandwidth, and the number of connected terminals is often used as a parameter. The RSM (111) acquires the above two parameters.
(2-7) Application type This information is necessary because the required QoS level differs depending on the application type. An application executing means (not shown) in the CPU (21) of the terminal can acquire an application being executed.

(3) Stability (3-1) Number of terminals connected to the access point An index indicating the degree of congestion of the access point. It may be difficult to measure the free bandwidth, and the number of connected terminals is often used as a parameter. This information is acquired by the RSM (111) for each wireless network.
(3-2) Terminal position By providing the communication terminal (30) with a GPS receiver (not shown), the terminal position can be acquired.
(3-3) Movement speed The movement speed of a terminal can be acquired by providing an acceleration sensor etc. in a communication terminal (30). It is possible to estimate how long it is possible to stay at the access point from the cover area. The TSM (132) acquires the above two pieces of information.
(3-4) Cover Area By combining the cover area of each wireless access, the above-described terminal position, and moving speed information, it is possible to estimate the time that the terminal can stay in the wireless access. In order to acquire this information, map information of a communicable area for each wireless access is prepared in the hard disk (24) or the like.

(4) Cost (4-1) Communication Charge The optimal wireless resource standard is considered to be a balance between guaranteed QoS and communication charge. Therefore, charge information when using each radio resource is required. Specifically, the communication fee can be calculated from the time measuring means and the data table of the fee table.

(5) Power consumption (5-1) Power consumption of the terminal when connected to each wireless access Information used to estimate the time during which the terminal can be used from the battery capacity and power consumption of the terminal. Data of power consumption may be stored in advance, or means for actually measuring power consumption may be provided.

Processing of the connection policy information generation unit (211b) of the present invention will be described.
This system is equipped with an architecture for maximizing the degree of satisfaction according to the preferences of individual users in an environment where communication quality fluctuates dynamically. Here, the user's satisfaction is not just application QoS, but also includes the user's psychological satisfaction. Therefore, it becomes a problem how to quantify the degree of satisfaction when a certain user uses a certain radio resource and reflect it in the connection policy information.

The above requirements range from those that can draw a graph of user satisfaction such as communication charges to those that cannot be directly mapped to user satisfaction such as RSSI. ing. Such information is large and can be classified into four types: communication quality, application QoS, subjective evaluation value, and user satisfaction.
Here, the communication quality means measurable quality information such as RSSI, delay, jitter, loss rate and the like.
Application QoS refers to quality information in the application layer, such as S / N in a video application.

  The subjective evaluation value is a value evaluated by a human for the quality of an application. By passing through the five human senses, the evaluation criteria are closer to the user's psychological satisfaction than the application QoS.

The user satisfaction is an evaluation value representing subjective satisfaction reflecting each user's preference.
It is considered that all information can be reflected in radio resource selection by converting such information so that it can be mapped to user satisfaction.

Among these four types of information, communication quality and application QoS are closely related, and many studies have been conducted on mutual conversion between them. Further, regarding the subjective evaluation value, a required value of the application QoS is generated in order to achieve the target MoS value, and conversion of both is possible by accumulating subjective evaluation experiments.
The connection policy generation unit (211b) can prepare these known correlations as conversion conditions in advance and define them based on the request conditions.

  Therefore, the conversion between the user satisfaction and the subjective evaluation value remains a problem. Subjective evaluation is performed in a measurement environment strictly defined by ITU-R or the like. However, in the case of video streaming, for example, there are some users who are not satisfied with the video playback with the same score, `` Is this level of image quality even though I paid this much price '', `` Is it so good though it is mobile? '' Some users are fully satisfied.

  For example, the graph with the subjective evaluation value (MoS value) on the axis and the satisfaction level on the vertical axis varies depending on the user, and there are various patterns as shown in FIG. Assume that the relationship between a user's MoS value and satisfaction is as shown in FIG. This represents that a certain MoS value is set as a threshold value, and if it is more than that, it is satisfactory, and if it is less than that, it is not satisfactory. On the other hand, there may be a user who becomes a more gradual graph as shown in FIG. 5B, and there may be a user with a high threshold as shown in FIG.

  In the connection policy generation unit (211b), such a correspondence relationship between the satisfaction level and the MoS value is created for each user and for each application, and is reflected in radio resource selection, thereby maximizing user satisfaction.

The following is also possible as an embodiment of the present invention. That is, the communication terminal (30) first acquires communication parameters that can be acquired by the terminal itself at the time of startup, for example, those that can be acquired by the TSM (132), and any one of predetermined rules (for example, free wireless LAN, paid Connect to the network according to the order of wireless LAN, mobile phone line, etc.).
In this state, the wireless access (communication network) selected by the network control unit (211a) is used as a recommended network for reconfiguration.

After that, the terminal acquires radio information as needed according to changes in the position and the application to be used, repeats switching while selecting a communication network, and continues communication.
In one embodiment of this system, the types of information exchanged between components are defined as shown in Table 1, and a signaling channel is always secured between the terminal and the network to transmit and receive information. When link aggregation is performed during the operation of an application, the number of connections is suppressed by using a channel in the link aggregation for signaling.

The TSM (132) periodically acquires these pieces of information, and when determining that the communication environment has changed, recalculates link aggregation and changes the connected access point as will be described later.
In this system, the bandwidth required by the application to be used is secured by connecting to a plurality of access points and performing aggregation.
Mobility is also realized by appropriately changing the aggregation according to the movement of the communication terminal and changes in the wireless environment, but it is also possible to implement a mobility function (see Non-Patent Document 11) that extends HMIP.
Murakami et al., “A Study on Mobility Function in Cognitive Wireless Cloud,” Shingaku Sodai, March 2008

In this system, a selection algorithm as shown in FIG. 9 is used to select an optimal radio resource in accordance with the user's preference.
That is, application QoS and priority are set for each user and each application from the communication terminal 30, and this information is stored in the request condition information (242) of the present apparatus (20). First, information on the access point (90) that can communicate with the network adapter (32) is acquired. Among these, access points e, f, and g are excluded from candidates because RSSI is below a predetermined threshold.

  On the other hand, a request QoS is defined for each application executed in the communication terminal (30). This data is stored in the communication terminal (30). For example, a threshold value of each value such as delay and jitter is determined for the VoIP application (91).

  In addition to the required condition (92) and required QoS (94), the above-described balance (93) of user satisfaction is aggregated in the connection policy information generation unit (211b), and a communication network is selected. For example, access points that satisfy the required QoS are first selected as selection candidates from the available access points, and are narrowed down to selection candidates that meet the user's cost requirements and power consumption requirements.

  In the connection policy information generation unit (211b), processing for lowering the priority of a congested band or selection of one communication network is performed according to the frequency usage status detected by the frequency measurement unit (52) and the degree of radio wave interference. Policy information can also be generated in a distributed manner so as not to concentrate.

When two or more selection candidates remain, considering the balance (93), if the satisfaction level increases by a predetermined value or more with a predetermined cost fluctuation range, the better one is selected.
For example, the connection policy information generation unit (211b) selects the access point b (95) in the case of a VoIP application by the algorithm as described above, and selects the link aggregation by the access point a + b + d in the case of a video application (96) ( 97). The selection result is stored in the connection policy information table (241).

  Then, when the network control unit (211) acquires the application being executed from the communication terminal (30) and the information of the access point that can be used at that time, the network control unit (211) determines the application and the access point that can be used from the connection policy information table. Search for combinations and determine the communication network to use. The determined communication network notifies the terminal control unit (311a) of the communication terminal (30) via the network adapter (22) and instructs the network reconfiguration execution processing unit (212a) to execute the reconfiguration execution processing.

Next, this network reconfiguration process will be described in detail.
As a simple embodiment of the present invention, a technique relating to network switching, such as an existing handover technique, can be used as appropriate for the network reconfiguration processing. In addition, as will be described later, it is also possible to apply a technique for switching a combination of communication networks linked by link aggregation. Since these are known techniques, the configurations of the network reconfiguration execution processing unit (212a) and the terminal reconfiguration execution processing unit (312a) of the present invention can be designed as appropriate.

Here, in addition to using these conventional techniques, a more preferable reconstruction technique will be described.
First, problems in current wireless network reconfiguration will be described. Taking a wireless LAN as an example, when a terminal is handed over across IP subnets, it mainly takes time for two processes of scanning and IP address acquisition.

  For example, in the case of a general wireless LAN card, when switching connections, a process of scanning all frequencies and obtaining a list of access points is forcibly performed. Depending on the device, this process takes about 2 to 12 seconds.

  Further, when the IP address is acquired by DHCP (Dynamic Host Configuration Protocol), the communication terminal tries to use the same IP address as long as the lease time specified by the DHCP server does not elapse, so the DHCP DISCOVERY message The DHCP REQUEST message is sent to the same DHCP server until a time-out occurs even if the user moves to a different subnet without sending the message. This timeout takes 1-2 seconds.

  Thus, when performing handover between access points using the same wireless device, communication interruptions that cannot be avoided generally occur. As long as sufficiently stable communication is performed, it can be said that the quality of communication is improved by reducing the number of handovers as much as possible.

  In FIG. 10, an arrow (100) indicates the movement of the communication terminal (30), and dotted circles (1001), (1002), and (1003) indicate the accessible ranges of the access points AP1 to AP3.

  If the communication network selection algorithm is a simple method that always selects the one with strong radio wave intensity, the radio wave intensity is stronger near the access point, so the connection is switched in the order of AP1 → AP2 → AP3. .

  However, if communication is sufficiently stable even in the vicinity of the boundary between AP1 and AP3, there is a risk that packet loss or jitter will occur when switching from AP1 to AP3 instead of switching to AP2. This is more preferable than the case where frequent switching is performed.

On the other hand, when a terminal moves, it normally moves within a physically limited range. In other words, the route that the masses move, such as the shortest distance between roads, hallways, and doorways, is considered to be limited to some extent.
Therefore, even when the access point to be switched is clear by the route or the like, it is not optimally selected by paying attention only to the radio wave intensity.

In this regard, it is possible for the communication terminal (30) to store past access points and evaluations that the communication terminal (30) experienced, and to use the evaluation as the material for the next determination when it is assumed that the communication terminal (30) has passed the same route. is there. However, since the amount of information is small in a single terminal, it is not possible to make an appropriate selection, and if there is little experience of moving around in the past, it is unlikely that a reasonable selection can be made statistically.
Obviously, this method does not work when moving to an unknown location.

  In the present system, in order to solve such problems, the apparatus (20) collects information from the communication terminal (30) and the network, accumulates, integrates and analyzes the information, and further performs communication terminal (30 ) To propose a platform for feeding back recommendation information related to wireless reconfiguration.

Since the platform proposed here uses a history of how the communication terminal (30) moves while connected to the access point, it is referred to as a radio white map platform (hereinafter, this platform) because of its distribution on the map.
The platform is realized by a plurality of communication terminals (30) and the device (20), and the algorithm is implemented as follows.

FIG. 11 shows this algorithm, and Table 2 shows a list of exchanged messages.

  First, the CTM (131) (for example, can be provided in the terminal reconfiguration management means (311)) periodically sends a measurement return request message to the TSM (132) (for example, can be provided in the measurement information collection unit (61)). (S30) is transmitted to request radio information, and the TSM (132) notifies the CTM (131) by a Measurement Retrieve Response message (S31).

  The CTM (131) generates a unit of information called Trace Element (TE) based on the information acquired from the TSM (132). The TE is a list describing the history of connected access points, and is recorded together with the connection time to each access point.

  Although the identifier of the access point varies depending on the type of the wireless system, for example, IEEE 802.11 is assumed and the MAC address is used as the identifier.

  TE is fragment information of an access point history in a fixed time unit in an individual terminal. This TE is transmitted from each communication terminal (30) to the CNM (12) (for example, communication network reconfiguration management means (211) of the apparatus (20). Will be collected in large quantities. The collected data is stored in the hard disk (24). This is performed by the Terminal Trace Report message (S32).

When the CTM (131) transmits this message, a plurality of pieces of information can be aggregated, or information with poor accuracy can be corrected or deleted.
The TE is collected from the communication terminal (30) to the present apparatus (20) by the Terminal Trace Report message, and the collected set of TEs is referred to as “Trace Element Set (TESet)”.

  Next, when the communication terminal (30) needs to make a recommendation from the apparatus (20) regarding the reconfiguration of communication, the CTM (131) transmits a Network Recommendation Request message (S33) to the CNM (12). To do.

  Based on the information given by this message, the CNM (12) selects a recommended access point, and notifies the CTM (131) by a Network Recommendation Response message (S34).

  As described in detail in the present invention, the access point to be notified here is further optimized using the platform from the communication network selected by the network control unit (211a) according to the connection policy information (241). The communication network to be configured is selected.

  Finally, the CTM (131) notifies the terminal reconfiguration execution means (TRC) (312) of the reconfiguration command Terminal Reconfiguration Request message (S35) based on the Network Recommendation Response message (S34), and is instructed by that message. Reconfiguration is performed, and the result is notified to the CTM (131) by a Terminal Reconfiguration Response message (S36).

  The transport type is arbitrary, but UDP (User Datagram Protocol) is preferable from the viewpoint of suppressing the overhead of traffic and improving the versatility of software.

An algorithm for controlling the number of reconstructions using this platform is shown below.
First, when an event occurs from the outside such as an application, or at regular intervals, the current communication state is inquired of the TSM (132). The communication state can be determined by, for example, the radio wave intensity.

  When the communication state is bad, the CTM (131) transmits a Network Recommendation Request message (S32) to the CNM (12), and acquires an access point to be reconfigured.

  At this time, TE, which is a list of a series of access points connected most recently, is included in the message (S32), and this TE is particularly referred to as Current Trace Element (CurTE).

  Here, the addition to CurTE is performed when the connection time to access exceeds a preset threshold, and the last access point registered in CurTE, that is, the access point connected in the past, is the last. If a sufficiently long time has passed since disconnection, it is likely not useful for determining an access point, and is deleted.

Next, processing in the CNM (12) will be described with reference to the flowchart of FIG.
When a Network Recommendation Request is received from the communication terminal (30) (S40), the CurTE included in this message is extracted, and the Target Trace Element (TarTE) is sequentially extracted as described below. Compare with the TESet that CNM (12) is collecting until the part to be matched is found.

  First, a method for extracting TarTE will be described. As shown in FIG. 13, TarTE (1300) is a portion obtained by cutting out the length of TarTE_LEN from the newer CurTE (1301) time. TarTE_LEN is sequentially subtracted by 1 from MAX_TarTE_LEN (1302) and continues until it reaches MIN_TarTE_LEN (1303). (S41)

As shown in FIG. 14, each TarTE is compared with TESet and extracts an array of TESet access points including TarTE. (S42)
Then, only one access point newer than the portion that matches TarTE is set as a candidate. (S43)

If there is a candidate at this time (S44), the candidate may be selected as a reconfiguration destination access point and notified to the communication terminal (30). Otherwise, the access point selected by the network control unit (211a) ( Communication network / communication system) may be notified.
(Another embodiment)

  The configuration of the present invention is as described above. Next, after the network reconfiguration is performed, the result is evaluated, and the configuration for updating the connection policy information (241) will be described.

  FIG. 5 is a configuration diagram of the apparatus (20 ') at this time, FIG. 6 is a configuration diagram of the communication terminal (30'), and FIG. 7 is a processing flowchart.

  In addition to the above embodiment, the communication network reconfiguration management means (211) includes a connection policy information evaluation unit (53), and after the terminal reconfiguration execution process (S14), the measurement information collection unit (51) and the frequency measurement unit Communication network measurement information collection step (S20) by (52), terminal measurement information collection step (S21) by the measurement information collection unit (61) of the communication terminal, and connection policy information evaluation step (S22) by the connection policy information evaluation unit (53) ) And a connection policy information update step (S23) by the connection policy information generation unit (211b).

  Specifically, communication is actually performed through the communication network selected by the network control unit, and communication parameters at that time are measured. Whether this value satisfies the required condition information (242) or whether it falls within a predetermined threshold from the required condition information (242) is compared and if not, the connection policy is based on the measured value. The information generation unit (211b) recalculates and updates the connection policy information table (242).

  For example, it is evaluated whether or not the QoS of the application executed on the communication terminal (30) is obtained, and if it is not obtained, another communication network is selected, or the connection policy information is changed to a link aggregation combination changed. .

  Note that the measurement information collecting unit (51) at this time may be arranged only on the network side and not measured on the terminal side. The measurement means may be provided outside the apparatus (20) as described above.

The present invention has the following industrial applicability by the above configuration.
That is, some mobile phone terminals have a plurality of wireless access devices. These are expected to be put to practical use by software radio technology and cognitive radio technology. At this time, by introducing the apparatus and processing method of the present invention, it becomes possible to develop the apparatus by dividing it into functional units, reducing development costs such as reducing test items, and flexibility of products after development. Improvement can be expected.

The same applies to the wireless access device on the network side. For example, it is called a radio base station that can dynamically change the frequency band and communication method to be used, or primary / secondary access that uses overlapping frequency bands without giving interference to other systems. In a network system or the like, the apparatus of the present invention can be applied to acquire information from these devices or change settings.
As described above, the present invention can enable the development of a general-purpose product in the near future where dynamic reconfiguration of a wireless system is expected to become serious.

1 is an overall configuration diagram of a communication network system according to the present invention. It is a block diagram of the network management apparatus in this invention. It is a block diagram of the communication terminal in this invention. It is a processing flowchart of the present invention. It is a block diagram of the network management apparatus in this invention (another Example). It is a block diagram of the communication terminal in this invention (another Example). It is a processing flowchart of the present invention (another example). It is a graph which shows the relationship between a subjective evaluation value (MoS value) and satisfaction. This is a radio resource selection algorithm in accordance with user preferences. It is explanatory drawing in which a communication terminal moves between access points. It is a process flowchart in a radio wave white map platform. It is a process flowchart of CNM. It is explanatory drawing of the method of extracting TarTE in CNM. It is explanatory drawing of the method of extracting TarTE in CNM.

Explanation of symbols

20 Network management device 21 CPU
211 communication network reconfiguration management unit 211a network control unit 211b connection policy information generation unit 212 communication network reconfiguration execution unit 212a network reconfiguration execution processing unit 22 network adapter 23 keyboard 24 hard disk 241 request condition information 242 connection policy information table

Claims (16)

A communication network system in which a communication terminal communicates while dynamically reconfiguring the presence or absence of a connection with a plurality of wired or wireless communication networks or a connection method (hereinafter referred to as a connection method),
On the communication network side,
A plurality of communication networks configured physically or logically;
A connection policy information table stored in the storage means;
A communication network reconfiguration management means for selecting a connection method of the communication network based on at least the connection policy information;
Communication network reconfiguration execution means for reconfiguring the connection to the selected connection method, etc.
The communication network reconfiguration management means
With respect to predetermined communication parameters in the communication network, input from the input means or using request condition information stored in the storage means,
While comprising a connection policy information generating unit that generates the connection policy information table using the correlation between the request condition information defined in advance as the conversion condition and the connection policy information from the request condition information,
In the communication terminal,
Terminal reconfiguration management means for selecting a connection method on the communication terminal side in cooperation with the communication network reconfiguration management means;
A communication network system comprising terminal reconfiguration execution means for reconfiguring a connection in a selected connection method or the like.   In the connection policy information generation unit,
  Select link aggregation, which is a combination of the communication networks to be linked, and store the result in the connection policy information table
  The communication network system according to claim 1.   A subjective evaluation value that is a value evaluated by a human with respect to the communication quality of an application as the requirement condition information, and a satisfaction degree related to the communication of the user for each user of the communication terminal,
  As the conversion condition, at least a correlation graph of the subjective evaluation value and the user satisfaction is stored,
  The connection policy information generation unit generates a connection policy information table that satisfies both the subjective evaluation value included in the request condition information and the user satisfaction based on the correlation graph.
  The communication network system according to claim 1 or 2. On the communication network side,
Communication network measurement information collecting means for extracting information on at least one of the communication parameters from each communication network,
The communication network reconfiguration management means is
A connection policy information evaluation unit that evaluates the contents of the connection policy information table based on information collected by the communication network measurement information collection unit;
The communication network system according to claim 2 or 3, wherein the connection policy information generation unit updates the connection policy information table according to the evaluation. On the communication network side,
Provided with frequency measuring means for measuring the frequency usage by each communication network,
The communication network system according to any one of claims 2 to 4, wherein the connection policy information generation unit updates the connection policy information table according to a frequency usage state. In the communication terminal,
Comprising terminal measurement information collection means for extracting information on at least one of the communication parameters from a communication network for communication;
The communication network system according to claim 4 or 5, wherein the connection policy information evaluation unit evaluates the contents of the connection policy information table based on information collected by the terminal measurement information collection unit. A network management device in a communication network system in which a communication terminal communicates while dynamically reconfiguring the presence or absence of a connection with a plurality of wired or wireless communication networks or a connection method (hereinafter referred to as a connection method),
In a configuration using a physical or logical communication network,
A connection policy information table stored in the storage means;
A communication network reconfiguration management means for selecting a connection method of the communication network based on at least the connection policy information;
Communication network reconfiguration execution means for reconfiguring the connection to the selected connection method, etc.
The communication network reconfiguration management means
With respect to predetermined communication parameters in the communication network, input from the input means or using request condition information stored in the storage means,
A network management apparatus comprising: a connection policy information generation unit that generates the connection policy information table from the request condition information using a correlation between the request condition information defined in advance as a conversion condition and the connection policy information . In the connection policy information generation unit,
Select link aggregation, which is a combination of the communication networks to be linked, and store the result in the connection policy information table
The network management device according to claim 7 . The requirement condition information includes at least a subjective evaluation value that is a value evaluated by a human with respect to communication quality of an application, and
As the conversion condition, for each user of the communication terminal, store a correlation graph between the satisfaction degree related to the communication of the user and the subjective evaluation value,
9. The network management according to claim 8, wherein the connection policy information generation unit generates a connection policy information table that satisfies both the subjective evaluation value included in the request condition information and the user satisfaction based on the correlation graph. apparatus. The network management device is
Communication network measurement information collecting means for extracting information on at least one of the communication parameters from each communication network,
The communication network reconfiguration management means is
A connection policy information evaluation unit that evaluates the contents of the connection policy information table based on information collected by the communication network measurement information collection unit;
The network management device according to claim 8 or 9, wherein the connection policy information generation unit updates the connection policy information table according to the evaluation. The network management device is
Provided with frequency measuring means for measuring the frequency usage by each communication network,
The network management device according to claim 8, wherein the connection policy information generation unit updates the connection policy information table according to a frequency usage state. 7. The communication network system according to claim 1, wherein communication is performed while dynamically reconfiguring presence / absence of connection or connection method (hereinafter referred to as connection method) with a plurality of wired or wireless communication networks. A communication terminal used ,
A terminal reconfiguration management means for selecting a connection method on the communication terminal side in cooperation with the communication network reconfiguration management means provided on the communication network side;
Terminal reconfiguration execution means for reconfiguring the connection to the selected connection method or the like;
A communication terminal comprising: terminal measurement information collecting means for extracting at least one of the communication parameters from a communication network for communication. A network communication method in which a communication terminal communicates while dynamically reconfiguring the presence or absence of a connection with a plurality of wired or wireless communication networks or a connection method (hereinafter referred to as a connection method),
With respect to predetermined communication parameters in the communication network, input from the input means or using request condition information stored in the storage means,
The connection policy information generation unit of the communication network reconfiguration management means on the communication network side
A connection policy information generating step for generating the connection policy information table from the request condition information using a correlation between the request condition information defined in advance as a conversion condition and the connection policy information;
A communication network selection step in which the communication network reconfiguration management means selects a connection method or the like of the communication network based on the connection policy information included in the connection policy information table stored in the storage means;
A terminal side communication network selection step in which the terminal reconfiguration management means of the communication terminal selects a connection method with the communication network, etc., triggered by a notification from the communication network reconfiguration management means,
A communication network reconfiguration execution means for reconfiguring the connection to the selected connection method or the like;
A terminal reconfiguration execution means for reconfiguring the connection to the selected connection method, etc.,
A network communication method comprising the steps of: In the connection policy information generation step,
The network communication method according to claim 13, further comprising: selecting a link aggregation that is a combination of the communication networks to be linked, and storing the result in a connection policy information table . A subjective evaluation value that is a value evaluated by a human with respect to the communication quality of an application as the requirement condition information, and a satisfaction degree related to the communication of the user for each user of the communication terminal,
As the conversion condition, at least a correlation graph of the subjective evaluation value and the user satisfaction is stored,
15. The network communication according to claim 14, wherein in the connection policy information generation step, a connection policy information table that satisfies both the subjective evaluation value included in the request condition information and the user satisfaction is generated based on the correlation graph. Method. In the network communication method, after the terminal reconfiguration execution step,
A communication network measurement information collecting unit provided on the network side, wherein the communication network measurement information collecting unit extracts at least one of the communication parameters from each communication network;
A connection policy information evaluation step in which the connection policy information evaluation unit of the communication network reconfiguration management means evaluates the contents of the connection policy information table based on the information collected by the communication network measurement information collection means;
The network communication method according to claim 14 or 15, wherein the connection policy information generation unit includes a connection policy information table update step of updating the connection policy information table according to the evaluation.