JP2019047198A - Radio communication system, radio communication terminal and network band control method - Google Patents

Abstract

To provide a radio communication system capable of adjusting the band width kinetically between radio communication terminals, without using dedicated network equipment.SOLUTION: A radio communication terminal (e.g., a VoIP terminal 100) sequentially registers the information of communication quality, measured periodically in the communication quality measurement section 103 of other radio communication terminal and broadcasted, on the registration table of a communication quality registration section 102. If the necessary band exceeds a currently assignable surplus band of the network, calculated based on the registration content of the registration table, when the radio communication terminal tried to start radio communication, a network band adjustment part 105 transmits a band transfer request to other radio communication terminal currently in radio communication, and if an updated surplus band, obtained by adding a transfer band received from other radio communication terminal to the surplus band, exceeds the necessary band, the necessary band is secured and radio communication with a communication partner is started.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a wireless communication system, a wireless communication terminal, and a network band control method, and more particularly, to a wireless communication system, a wireless communication terminal and a network using a network that supports an IP (Internet Protocol) protocol such as a Voice over Internet Protocol (VoIP) protocol. The present invention relates to a bandwidth control method.

  In recent years, with the advancement of functions of wireless communication terminals and the sophistication of applications, there is an increasing opportunity for processing requiring a very wide network band. For example, in the case of a Voice over Internet Protocol (VoIP) application, video calls as well as voice calls are becoming widely used. Under these circumstances, when video calls and the like are newly started, there is an increasing number of cases where the network bandwidth is short and communication quality is degraded including existing calls.

  In order to cope with such a problem, a mechanism for adjusting a network bandwidth called Quality of Service (QoS) management has been proposed. The construction of this mechanism is easy if a dedicated network device is used. However, in practice, there are many cases where a network is configured without using a dedicated network device, and the dedicated network device is not used very much. Therefore, there is a strong demand for a network bandwidth adjustment method that does not require a dedicated network device.

  For example, Japanese Patent Application Laid-Open No. 2007-306509 entitled "Wireless communication system, wireless communication terminal, wireless communication method and wireless communication program" describes the current technology of adjusting the network band without using a dedicated network device. is there. In the technology of this patent document 1, the band information used by the wireless communication terminal itself is provided to another terminal, and the band information used also from other terminals is adjusted to adjust the network band. A quality control method for wireless communication has been proposed. Further, as another technology, there is JP-A-2016-012818 “wireless communication apparatus and wireless communication method” of Patent Document 2. In this patent document 2, the wireless communication device serving as an access point incorporates a mechanism for sharing a wireless communication band with other wireless communication devices, and based on the detection result of the surrounding wireless environment, There has been proposed a method of requesting a wireless communication apparatus to change a channel used for wireless communication, selecting any of a plurality of channels, and transmitting / receiving data to / from an external information processing terminal by wireless communication.

JP 2007-306509 A JP, 2016-012818, A

  As described above, in the technology widely used as a current wireless communication network in which a dedicated network device for performing QoS management is not installed, when a wireless communication terminal tries to communicate, another wireless If it is found that the communication terminal has already occupied many network bands and it can not communicate with the desired communication quality (for example, communication speed), the communication quality (for example, communication speed) is lowered to perform communication. Or had to give up on the communication itself. In order to cope with such a situation, the techniques of Patent Document 1 and Patent Document 2 have proposed a method of adjusting the network bandwidth without using a dedicated network device.

  However, in the existing technology related to the present invention as described in Patent Document 1 and Patent Document 2, there are the following problems.

  According to the technology described in Patent Document 1, the wireless communication terminal occupies a wide network band from the occupied band information obtained by collecting the occupied band information from the other wireless communication terminal. When it is determined that the desired wireless communication can not be performed without flexibly exchanging part of the bandwidth, it is a technique of giving up wireless communication. Therefore, the technique of Patent Document 1 can not be said to be the technique of adjusting the network bandwidth between the wireless communication terminals, and can not fundamentally solve the problem of the bandwidth control technique in the current network.

  Further, in the technology described in Patent Document 2, when it is recognized that another wireless communication device has occupied a plurality of channels in a certain wireless communication device forming an access point, any one of the plurality of channels. This is a technology to select from and use it flexibly from other wireless communication devices, and it is not possible to fine-tune adjustment because network bandwidth adjustment is performed on a channel basis of wireless communication, and desired communication quality ( There is a high possibility that communication speed can not be obtained.

(Object of the present invention)
The present invention has been made in view of such circumstances, and a wireless communication system capable of dynamically adjusting a network band finely between wireless communication terminals without using a dedicated network device, and wireless communication It is an object to provide a terminal and a network bandwidth control method.

  In order to solve the above-described problems, the wireless communication system, the wireless communication terminal, and the network band control method according to the present invention mainly adopt the following characteristic configurations.

(1) A wireless communication system according to the present invention is
In a wireless communication system for performing wireless communication between wireless communication terminals connected to a network,
The wireless communication terminal is
Communication for registering information on the communication quality of all wireless communication terminals connected to the network and in a wireless communication state, together with a terminal identifier for specifying each wireless communication terminal, in a communication quality registration table for each predetermined registration cycle Quality registration means,
When the self-wireless communication terminal is in the wireless communication state, the effective network band being used is measured as the communication quality of the self-wireless communication terminal in each measurement cycle determined in advance, and information about the measured communication quality is While notifying the communication quality registration means to request registration in the communication quality registration table, broadcast to the network to notify all other wireless communication terminals connected to the network, and others Communication quality measurement means for requesting registration in the communication quality registration table provided in all of the wireless communication terminals of
Based on the information on the communication quality registered in the communication quality registration table, the wireless communication of the desired communication quality by adapting the network band with another communication terminal currently in the wireless communication state Network bandwidth adjustment means for securing the necessary network bandwidth required to
Furthermore, the wireless communication terminal
When trying to newly start wireless communication with the other party,
In the network bandwidth adjusting means, referring to the communication quality registration table, another wireless communication terminal is already in wireless communication, and the network bandwidth of the network is used, and the network bandwidth is not in use. When it is determined that there is no band remaining in the necessary network band required by the wireless communication terminal as the surplus network band of the wireless communication terminal, and the other wireless communication terminal in the wireless communication state is 1 Or, if there are a plurality of them, transmit, in a predetermined order, a bandwidth accommodation request requesting accommodation of the network bandwidth in use to the other wireless communication terminal in the wireless communication state,
And, when it receives, from the other wireless communication terminal to which the bandwidth accommodation request is sent, information on an accommodation bandwidth indicating a network bandwidth to be accommodated to the wireless communication terminal.
The network band adjustment means determines whether or not the post-update surplus network band, which is the result of adding the accommodation band to the surplus network band, is in a state above the necessary network band,
When it is determined that the surplus network band after update is in the state of the required network band or more, the necessary network band is secured as a new network band for wireless communication, and wireless communication with the communication partner is started. It is characterized by

(2) A wireless communication terminal according to the present invention
A wireless communication terminal that performs wireless communication via a network,
Communication for registering information on the communication quality of all wireless communication terminals connected to the network and in a wireless communication state, together with a terminal identifier for specifying each wireless communication terminal, in a communication quality registration table for each predetermined registration cycle Quality registration means,
When the self-wireless communication terminal is in the wireless communication state, the effective network band being used is measured as the communication quality of the self-wireless communication terminal in each measurement cycle determined in advance, and information about the measured communication quality is While notifying the communication quality registration means to request registration in the communication quality registration table, broadcast to the network to notify all other wireless communication terminals connected to the network, and others Communication quality measurement means for requesting registration in the communication quality registration table provided in all of the wireless communication terminals of
Based on the information on the communication quality registered in the communication quality registration table, the wireless communication of the desired communication quality by adapting the network band with another communication terminal currently in the wireless communication state Network bandwidth adjustment means for securing the necessary network bandwidth required to
When trying to newly start wireless communication with the other party,
In the network bandwidth adjusting means, referring to the communication quality registration table, another wireless communication terminal is already in wireless communication, and the network bandwidth of the network is used, and the network bandwidth is not in use. When it is determined that there is no band remaining in the necessary network band required by the wireless communication terminal as the surplus network band of the wireless communication terminal, and the other wireless communication terminal in the wireless communication state is 1 Or, if there are a plurality of them, transmit, in a predetermined order, a bandwidth accommodation request requesting accommodation of the network bandwidth in use to the other wireless communication terminal in the wireless communication state,
And, when it receives information on the flexible band indicating the network band to be flexible from the other wireless communication terminal to which the band flexibility request is sent,
The network band adjustment means determines whether or not the post-update surplus network band, which is the result of adding the accommodation band to the surplus network band, is in a state above the necessary network band,
If it is determined that the surplus network band after update is in the state of the required network band or more, the necessary network band is secured as a new network band for wireless communication, and wireless communication with the communication partner is started. It is characterized by

(3) The network bandwidth control method according to the present invention is
A network bandwidth control method in a wireless communication system for performing wireless communication between wireless communication terminals connected to a network, the method comprising:
The wireless communication terminal is
Communication for registering information on the communication quality of all wireless communication terminals connected to the network and in a wireless communication state, together with a terminal identifier for specifying each wireless communication terminal, in a communication quality registration table for each predetermined registration cycle Quality registration step,
When the self-wireless communication terminal is in the wireless communication state, the effective network band being used is measured as the communication quality of the self-wireless communication terminal in each measurement cycle determined in advance, and information about the measured communication quality is In the communication quality registration step, it is requested to register in the communication quality registration table, and broadcast to the network to notify all other wireless communication terminals connected to the network, and the other wireless A communication quality measurement step of requesting registration in the communication quality registration table provided in all of the communication terminals;
Based on the information on the communication quality registered in the communication quality registration table, the wireless communication of the desired communication quality by adapting the network band with another communication terminal currently in the wireless communication state Network bandwidth adjustment step to secure the necessary network bandwidth required to
Furthermore, the wireless communication terminal
When trying to newly start wireless communication with the other party,
In the network bandwidth adjustment step, referring to the communication quality registration table, another wireless communication terminal is already in wireless communication, and the network bandwidth of the network is used, and the network is not in use. When it is determined that there is no band remaining in the necessary network band required by the wireless communication terminal as the surplus network band of the wireless communication terminal, and the other wireless communication terminal in the wireless communication state is 1 Or, if there are a plurality of them, transmit, in a predetermined order, a bandwidth accommodation request requesting accommodation of the network bandwidth in use to the other wireless communication terminal in the wireless communication state,
And, when it receives, from the other wireless communication terminal to which the bandwidth accommodation request is sent, information on an accommodation bandwidth indicating a network bandwidth to be accommodated to the wireless communication terminal.
In the network band adjustment step, it is determined whether or not the updated surplus network band, which is the result of adding the accommodation band to the surplus network band, is in the state of the required network band or more.
If it is determined that the surplus network band after update is in the state of the required network band or more, the necessary network band is secured as a new network band for wireless communication, and wireless communication with the communication partner is started. It is characterized by

  According to the wireless communication system, the wireless communication terminal, and the network band control method of the present invention, the following effects can be achieved.

  That is, in the present invention, when a wireless communication terminal tries to communicate in a wireless communication environment where there is no dedicated network device provided with a Quality of Service (QoS) function or the like, Even under the situation where many network bands are occupied by other wireless communication terminals, the network band is dynamically accommodated (adjusted) between the wireless communication terminals. The corresponding wireless communication terminal can perform wireless communication with a desired communication quality (communication speed) or a communication quality (communication speed) close to the desired communication quality (communication speed).

It is a system configuration figure showing an example of system configuration of a radio communications system concerning the present invention. FIG. 2 is a block diagram showing an example of an internal configuration of a VoIP terminal shown as an example of a wireless communication terminal in FIG. It is a table which shows an example of the information regarding the VoIP communication quality of each VoIP terminal stored sequentially in the VoIP communication quality storage part of the VoIP terminal shown in FIG. It is a table which shows an example of the information regarding the support codec registered beforehand by the VoIP communication processing part of the VoIP terminal shown in FIG. FIG. 13 is a table showing a registration example different from FIG. 4 of information on support codecs registered in advance in the VoIP communication processing unit of the VoIP terminal shown in FIG. 2; It is a sequence diagram for demonstrating an example of operation | movement of the VoIP communication system shown in FIG.

  Hereinafter, preferred embodiments of a wireless communication system, a wireless communication terminal, and a network bandwidth control method according to the present invention will be described with reference to the attached drawings. Note that such a network bandwidth control method may be implemented as a network bandwidth control program executable by a computer, or the network bandwidth control program may be recorded on a computer readable recording medium. Needless to say. Further, reference numerals in the drawings attached to the following drawings are for convenience added to the respective elements as an example for aiding understanding, and it is needless to say that the present invention is not intended to be limited to the illustrated embodiment. Yes.

(Features of the present invention)
Before describing the embodiments of the present invention, the features of the present invention will first be outlined. The main feature of the present invention is to enable dynamic adjustment of mutually used network bands between wireless communication terminals connected to the same network. That is, according to the present invention, when a wireless communication terminal tries to start communication, another wireless communication terminal already occupies many network bands (network resources), and a desired communication quality (for example, communication speed) Negotiate with other wireless communication terminals that occupy and use many network bandwidths to negotiate the required network bandwidth flexibility when it is found that communication can not be performed in). Thus, the main feature is that the network band is flexibly transmitted from the other wireless communication terminal. Thus, both the wireless communication terminal and the other wireless communication terminal may perform communication with desired communication quality (for example, communication speed) or communication quality (for example, communication speed) close to the desired communication quality. It will be possible.

(Configuration Example of Embodiment of the Present Invention)
Next, a system configuration example of a wireless communication system according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a system configuration diagram showing an example of a system configuration of a wireless communication system according to the present invention. FIG. 1 shows a configuration example of a VoIP communication system that performs voice communication using an IP (Internet Protocol) protocol, that is, VoIP (Voice over Internet Protocol) communication, as an example of a wireless communication system. Then, in FIG. 1, for example, six VoIP terminals 1 to 6 as VoIP communication terminals are connected to the network 10 for performing communication according to the VoIP protocol, and relay communication between the VoIP terminals. An example in which a VoIP server 9 is connected as a communication server is shown. That is, six VoIP terminals 1 to 6 are connected to the same network 10, and all of them are desired to be used from the common network band (network resources) of the network 10 at the start of wireless communication. The wireless communication is configured to start by securing a network bandwidth of

  As shown in FIG. 1, for each of the six VoIP terminals 1 to 6 connected to the network 10, for example, '192.168.0.1' is used as an IP address to be a terminal identifier of each VoIP terminal. 'To' 192.168.0.6 'is assigned, and the VoIP server 9 is assigned an IP address of' 192.168.0.9 ', for example.

  Next, an example of the internal configuration of the six VoIP terminals 1 to 6 shown in FIG. 1 will be described with reference to FIG. FIG. 2 is a block diagram showing an example of the internal configuration of the VoIP terminal shown as an example of the wireless communication terminal in FIG. Each of the six VoIP terminals 1 to 6 shown in FIG. 1 has the same internal configuration as the VoIP terminal 100 shown in FIG.

  That is, as shown in the VoIP terminal 100 of FIG. 2, all of the six VoIP terminals 1 to 6 shown in FIG. 1 are the communication unit 101, the VoIP communication quality registration unit 102, and the VoIP communication quality measurement unit 103. And a VoIP communication processing unit 104, a network band adjustment unit 105, and a VoIP communication quality storage unit 106. Note that the wireless communication terminal targeted by the present invention may be configured using the same internal configuration as that of FIG. 2, and the communication quality registration unit corresponding to the communication unit 101 and the VoIP communication quality registration unit 102, VoIP communication Communication quality measurement means corresponding to the quality measurement unit 103, communication processing means corresponding to the VoIP communication processing unit 104, network band adjustment means corresponding to the VoIP network bandwidth adjustment unit 105, and communication quality storage corresponding to the VoIP communication quality storage unit 106 At least the means may be included.

  The communication unit 101 is a functional block connected to the network 10 to transmit and receive data (VoIP packets) with the VoIP server 9 and other VoIP terminals.

  Also, the VoIP communication quality registration unit 102 receives the information on the VoIP communication quality in the own VoIP terminal handed over from the VoIP communication quality measurement unit 103, and the VoIP communication quality in other VoIP terminals broadcasted from each other VoIP terminal. When the communication unit 101 receives the information related to the VoIP communication quality, the information related to the VoIP communication quality of the other VoIP terminal received by the communication unit 101 is stored in the VoIP communication quality storage unit 106 at predetermined registration cycles. It is a functional block sequentially registered in the registration table.

  Also, the VoIP communication quality measurement unit 103 measures the VoIP communication quality in the own VoIP terminal in each predetermined measurement cycle, and sends the measured information on the VoIP communication quality in the own VoIP terminal to the VoIP communication quality registration unit 102. While handing over and requesting registration in the VoIP communication quality storage unit 106, the information related to the VoIP communication quality in the own VoIP terminal measured is broadcast to the connected network 10 via the communication unit 101, It is a functional block that transmits to all the other VoIP terminals connected to the network 10 and requests registration in the VoIP communication quality storage unit 106 provided in all the other VoIP terminals.

  In addition, the VoIP communication processing unit 104 internally has a support codec registration table in which codecs to be supported as VoIP communication and necessary bands required for the codecs are registered in advance. It is a functional block that performs processing such as audio and video.

  Furthermore, when starting the VoIP communication, the VoIP communication processing unit 104 sends a bandwidth securing request for requesting securing of the network bandwidth to the network bandwidth adjusting unit 105 described later. At this time, the network band adjustment unit 105 confirms the network band (necessary band) required for each codec to be supported, and information indicating both the maximum value and the minimum value of the required band is used as the information. Include in the bandwidth reservation request and notify. After that, when the secured network bandwidth is received as a secured bandwidth from the network bandwidth adjusting unit 105 of the transmission destination of the bandwidth securing request, the VoIP communication processing unit 104 transmits the secured bandwidth notified from the network bandwidth adjusting unit 105. Based on this, codec candidates to be used for VoIP communication from now on are selected, and codec negotiation with a VoIP terminal as a transmission destination is performed.

  Furthermore, the VoIP communication processing unit 104 is configured to request bandwidth accommodation of the network bandwidth from the network bandwidth adjustment unit 105 provided in another VoIP terminal via the network bandwidth adjustment unit 105 described later during VoIP communication. If you receive a request, check if it supports a codec that uses less network bandwidth than the codec currently being used. If not supported, the network bandwidth adjustment unit 105 together with the information indicating the terminal identifier for identifying the VoIP terminal of the communication partner, as well as the response information including no compatible band (inclusive band 0) indicating that there is no band to be accommodated. , And is returned to the network bandwidth adjustment unit 105 of the other VoIP terminal of the request source.

  On the other hand, when a codec that uses a network band smaller than the currently used codec is supported, the VoIP communication processing unit 104 first negotiates a codec change with the VoIP terminal of the communication partner. If, as a result of the negotiation, the VoIP terminal of the other party has agreed to a codec change, the codec currently used is changed to a codec that uses less network bandwidth. Furthermore, in the network bandwidth adjustment unit 105, the difference X (X ≠ 0) of the required bandwidth between the codec up to the present time and the codec after change is calculated as a network bandwidth (flexibility bandwidth) to be adapted according to the bandwidth adaptation request. Then, the response information including the interchange bandwidth X corresponding to the difference X is returned to the network bandwidth adjustment unit 105 of the other VoIP terminal of the request source together with the information indicating the terminal identifier specifying the VoIP terminal of the communication partner. . As a result of negotiation of codec change with the VoIP terminal of the communication partner, when the VoIP terminal of the communication partner does not agree on codec change, the response information including no flexible band (flexible band 0) is It is returned to the network band adjustment unit 105 of the other VoIP terminal of the request source together with the information indicating the terminal identifier for identifying the VoIP terminal.

  Next, the network bandwidth adjustment unit 105 is a functional block for securing a desired network bandwidth for use in new VoIP communication based on the bandwidth securing request for securing the network bandwidth from the VoIP communication processing unit 104. . Specifically, first, based on the communication quality information of each VoIP terminal connected to the network 10 stored in the VoIP communication quality storage unit 106, the surplus band (surplus network band in unused state) in the current network 10 Calculate

  If the surplus band is equal to or more than the minimum value of the required band of the codec requested by the band securing request from the VoIP communication processing unit 104, the network band adjustment unit 105 determines the network band of the minimum value of the required band of the codec. The request information for securing the call for the bandwidth securing request as the requested bandwidth and notifying the response information including the secured bandwidth for securing as the bandwidth securing success response is notified to the VoIP communication processing unit 104 of the request source.

  On the other hand, no band corresponding to the required network band required by the call for the band securing request is left as the calculated surplus band (that is, surplus network band in the unused state of the network 10), and the surplus band is VoIP When it is not more than the minimum value of the required bandwidth of the codec requested by the bandwidth securing request from the communication processing unit 104, the network bandwidth adjusting unit 105 has already assigned to another VoIP terminal currently in communication. It is inquired in a predetermined order to other VoIP terminals in the communication state whether it is possible to flexibly receive the network bandwidth which has already been used.

  That is, the network bandwidth adjustment unit 105 refers to the latest VoIP communication quality stored in the VoIP communication quality storage unit 106 and, for example, in the predetermined order for other VoIP terminals currently in communication, for example, Then, in the order of using a large amount of network bandwidth, a bandwidth accommodation request that requires network bandwidth accommodation is transmitted to other VoIP terminals. However, a VoIP terminal which is a communication partner of a VoIP terminal for which the terminal identifier (IP address) of another VoIP terminal to which the bandwidth accommodation request is to be transmitted is the basis of the bandwidth securing request from the VoIP communication processing unit 104 If the terminal identifier (IP address) is the same as the terminal identifier (IP address), the transmission of the bandwidth accommodation request to the other VoIP terminal is suppressed, and the bandwidth accommodation request is transmitted to the other VoIP terminal in the next order.

  Also, when receiving response information including no accommodation bandwidth (inclusion bandwidth 0) indicating that bandwidth accommodation can not be performed from another VoIP terminal that has transmitted the bandwidth accommodation request, the network bandwidth adjustment unit 105 Send bandwidth accommodation request to other VoIP terminals in the order of. On the other hand, when receiving response information including the flexible band X (X 融通 0) indicating that the band X is flexible, from the other VoIP terminal that has transmitted the band flexibility request, the network band adjustment unit 105 Whether the total surplus bandwidth (that is, the surplus network bandwidth after update) as a result of adding the received flexible bandwidth X to the surplus bandwidth of the current network 10 is equal to or more than the minimum value of the codec required bandwidth requested by the bandwidth reservation request Check if it is not. If the total surplus band is smaller than the minimum value of the required band, the network band adjustment unit 105 repeats the process of transmitting a band accommodation request to another VoIP terminal in the next order.

  On the other hand, when the total surplus bandwidth becomes equal to or more than the minimum value of the required bandwidth, the network bandwidth adjustment unit 105 uses the minimum value of the required bandwidth as the secured bandwidth for the call for the bandwidth reservation request. The secured response information including the secured bandwidth is notified to the VoIP communication processing unit 104 of the request source as a bandwidth securement success response. On the other hand, even if the bandwidth accommodation request is transmitted to all other VoIP terminals, if the total surplus bandwidth does not reach the minimum value of the required bandwidth or more, the network bandwidth adjustment unit 105 reserves A response signal including no band (secured band 0) is notified to the VoIP communication processing unit 104 of the request source as a bandwidth securement failure response indicating that the desired bandwidth has not been secured.

  When the network bandwidth adjustment unit 105 receives a bandwidth accommodation request for requesting network bandwidth accommodation from another VoIP terminal, the network bandwidth adjustment unit 105 requests the VoIP communication processing unit 104 for network bandwidth accommodation and makes a request. When the response from the VoIP communication processing unit 104 is returned, the response information to the bandwidth accommodation request (that is, the information indicating the availability of accommodation and the accommodation when accommodation is possible) based on the response An information including at least an accommodation band and a terminal identifier (i.e., an IP address) of a VoIP terminal of a communication counterpart is created and returned to another VoIP terminal as a transmission source of the bandwidth accommodation request.

  Next, the VoIP communication quality storage unit 106 is a functional block that sequentially stores VoIP communication quality information notified from the VoIP communication quality registration unit 102. Here, as described above, the VoIP communication quality registration unit 102 sequentially receives, from the VoIP communication quality measurement unit 103, information related to the VoIP communication quality of the own VoIP terminal measured in each predetermined measurement cycle, and Information on VoIP communication quality of each other VoIP terminal is sequentially received from the communication unit 101 which receives information on VoIP communication quality of each other VoIP terminal broadcasted every predetermined measurement period from the VoIP terminal of And sequentially store each predetermined registration cycle.

  FIG. 3 is a table showing an example of information on VoIP communication quality of each VoIP terminal stored sequentially in the VoIP communication quality storage unit 106 of the VoIP terminal 100 shown in FIG. The registration example shown in FIG. 3 shows the case where the VoIP communication quality measurement unit 103 of the VoIP terminal 1 to VoIP terminal 6 shown in FIG. 1 performs measurement in a one-minute cycle as a predetermined measurement cycle. ing. Also, in the registration example shown in FIG. 3, the VoIP terminal 3 that identifies the VoIP terminal (ie, IP address) is '192.169.0.3', and the endpoint identifier is '192.168.0.04'. Of the VoIP terminal 4 and the terminal identifier (ie IP address) of the VoIP terminal 5 of '192.169.0.5' and the terminal identifier of '192.168.0.06' The case where VoIP communication with the VoIP terminal 6 is performed is shown as an example. Further, in the registration example shown in FIG. 3, as the VoIP communication quality of each VoIP terminal, the codec used in VoIP communication and the effective bit rate indicating the effective network bandwidth (transmission speed) in the codec used It shows an example of measurement.

  As shown in FIG. 3, the VoIP communication quality registration table 107 in which the VoIP communication quality storage unit 106 sequentially stores information on VoIP communication quality of each VoIP terminal includes date and time 107a, terminal identifier 107b, opposite terminal identifier 107c, and codec 107d used. , And an effective bit rate 107e. In FIG. 3, the terminal identifier 107b and the opposite terminal identifier 107c store an identifier (that is, an IP address) for specifying VoIP terminals communicating with each other. In addition, the codec 107 d used and the effective bit rate 107 e indicate the case where the codec used by each and the effective bit rate indicating the actual communication speed are stored as an example of the information on the VoIP communication quality of each VoIP terminal. ing.

  And in the registration example shown in FIG. 3, the registration content of the past communication quality in the several time near the present time (16:55 of 2017/03/02) is shown, and VoIP in the state in communication is shown The information on the measurement result of the VoIP communication quality of each VoIP terminal of the terminal 3 to the VoIP terminal 6 is shown in the following for the period from 16:50 to 16:54 of 2017/03/02 shown in the date 107a in 1 minute steps. As such, they are stored sequentially in time series. The four lines on the bottom line side of the registration example shown in FIG. 3 are described for the purpose of describing “(Description of the operation example of the embodiment of the present invention)” described later, and It shows the registered contents registered as a result of the operation example at the time (16: 55 of 2017/03/02), and the description here is omitted.

(1) When the date and time 107a is 16: 50 to 16: 51 of 2017/03/02,
Both the VoIP terminal 3 whose terminal identifier is '192.169.0.3' and the VoIP terminal 4 whose terminal identifier is '192.168.0.04' are both used in the codec 107 d used and the effective bit rate 107 e. As shown, codec H.1. It is registered that bi-directional communication using H.264 (required bit rate 384 kbps) is performed at an effective bit rate 384 kbps.

(2) When the date and time 107a is from 16: 52 to 16: 53 of 2017/03/02,
The VoIP terminal 3 whose terminal identifier is '192.169.0.3' and the VoIP terminal 4 whose terminal identifier is '192.168.0.04' are as shown in the used codec 107 d and the effective bit rate 107 e, respectively. , Codec H. Two-way communication using H.264 (required bit rate 384 kbps) is performed at (301 to 300) kbps and (300 to 299) kbps, which is lower than the 384 kbps effective bit rate achieved in the previous cycle. The effect is registered. Furthermore, the VoIP terminal 5 whose terminal identifier is '192.169.0.5' and the VoIP terminal 6 whose terminal identifier is '192.168.0.06' are shown in the codec 107 d used and the effective bit rate 107 e, respectively. As such, codec H. It is registered that bi-directional communication using H.264 (required bit rate 384 kbps) is performed at 302 kbps and 303 kbps at which the effective bit rate is lower than 384 kbps.

(3) If the date and time 107a is 16: 54 of the latest 2017/03/02,
As both VoIP terminal 3 whose terminal identifier is '192.169.0.3' and VoIP terminal 4 whose terminal identifier is '192.168.0.04' are shown to codec 107 d used and effective bit rate 107 e , Codec H. It has been registered that bidirectional communication using H.264 (384 kbps) is being restored to an effective bit rate of 384 kbps which has been realized in a cycle of 16:50 to 16:51. Further, the communication between the VoIP terminal 5 and the VoIP terminal 6 which were performing VoIP communication in the cycle of 16: 52 to 16: 53 up to the previous time is not performed.

(Description of Operation Example of Embodiment of the Present Invention)
Next, an operation of the VoIP communication system shown in FIGS. 1 and 2 will be described with reference to the drawings. Here, as exemplified in the VoIP communication quality registration table 107 of FIG. 3, the VoIP communication quality measurement unit 103 of each VoIP terminal of the VoIP terminal 1 to VoIP terminal 6 shown in FIG. It is assumed that the VoIP communication quality is measured on a periodic basis. Then, as described above, the information on the VoIP communication quality to be measured is two pieces of information of the codec (necessary bit rate) being used and the effective bit rate indicating the communication speed actually being communicated. I assume. Furthermore, as shown in the registration example of the VoIP communication quality registration table 107 in FIG. 3, the VoIP terminal 3 whose terminal identifier (ie IP address) is' 192.169.0.3 'and the terminal identifier' 192.168.0 The VoIP terminal 4 of .04 'is already in communication, and the terminal identifier (that is, the IP address) of VoIP terminal 5 of' 192.169.0.5 'and the terminal identifier of' 192.168.0 It is assumed that the VoIP terminal 6 of '.06' is already in communication.

  Under such communication conditions, the VoIP terminal 1 whose terminal identifier (ie IP address) is '192.169.0.1' and the VoIP terminal 2 whose terminal identifier (ie IP address) is '192.169.0.2' An operation example will be described below with respect to a case where it is attempted to newly start VoIP communication among them. The information on the supported codecs supported by the VoIP terminal 1 and the VoIP terminal 2 is, for example, as shown in FIG. 4, and the information on the supported codecs corresponds to each of the VoIP terminal 1 and the VoIP terminal 2. It is assumed that the VoIP communication processing unit 104 is registered in advance. FIG. 4 is a table showing an example of information on a support codec registered in advance in the VoIP communication processing unit 104 of the VoIP terminal 100 shown in FIG.

  The registration example illustrated in FIG. 4 illustrates information on codecs supported by each of the VoIP terminal 1 and the VoIP terminal 2 that are about to newly start VoIP communication. As shown in FIG. 4, the support codec registration table 108 for registering information on support codecs supported by the VoIP terminal includes codecs 108a for registering types of codecs to be supported and communication bandwidths required for the respective codecs for registration ( A required bit rate 108b indicating the communication speed).

  Then, in the registration example of the support codec registration table 108 shown in FIG. 4, each of the VoIP terminal 1 and the VoIP terminal 2 is, as shown in the codec 108 a, a codec that the H.264 codec supports. H.264, and as indicated by the required bit rate 108b, it is registered that the required bit rate is either 384 kbps or 240 kbps.

  5 is a table showing an example of registration of information on support codecs registered in advance in the VoIP communication processing unit 104 of the VoIP terminal 100 shown in FIG. 2 different from FIG. 4 and VoIP already in the VoIP communication state. The example of registration of the information regarding the codec which each of the terminal 3-the VoIP terminal 6 supports is shown.

  Then, in the registration example of the support codec registration table 109 shown in FIG. 5, each of the VoIP terminal 3 to the VoIP terminal 6 is, as shown in the codec 109a, H. H.264, and as shown in the required bit rate 109b, it is registered that the required bit rate is any one of seven types of 384 kbps, 240 kbps, 192 kbps, 160 kbps, 128 kbps, 80 kbps and 64 kbps. ing.

  On the premise of the registration example related to the support codec as shown in FIGS. 4 and 5, next, VoIP terminal 1 (terminal identifier: '192.168.0.1') to VoIP terminal 2 (terminal identifier: '192) An example of the operation in the case of newly starting VoIP communication for .168.0.2 ′) will be described in detail with reference to the sequence diagram shown in FIG. FIG. 6 is a sequence diagram for explaining an example of the operation of the VoIP communication system shown in FIG. In the sequence diagram of FIG. 6, as shown in the VoIP communication quality registration table 107 of FIG. 3, the VoIP terminal 3 to VoIP terminal 6 are already in the VoIP communication state, and the current date is 2017. An example of an operation at the time of newly starting VoIP communication from the VoIP terminal 1 to the VoIP terminal 2 will be described on the assumption that it is 16:55 of / 03/02.

  Further, in the sequence diagram shown in FIG. 6, the VoIP communication processing unit 104 among the internal functional blocks of the VoIP terminal 1 that performs a new transmission operation and the VoIP terminal 3 that is the transmission destination of the bandwidth accommodation request. An example of transmission and reception of signals in the network band adjustment unit 105 and the VoIP communication quality storage unit 106 is shown, and the VoIP terminal 2 as the communication partner of the VoIP terminal 1 and the VoIP terminal 4 in communication as the communication partner of the VoIP terminal 3 are shown. And, an example of transmission and reception of signals in the VoIP communication processing unit 104 is shown.

  In the sequence diagram of FIG. 6, first, the VoIP communication processing unit 104 of the VoIP terminal 1 of the new transmission source sends a band securing request for requesting securing of the network band to the network band adjusting unit 105 of the own VoIP terminal 1 To do (sequence S1). At this time, as exemplified in the required bit rate 108b of the supported codec registration table 108 of FIG. 4, the bandwidth reservation request is 384 kbps as the maximum value and 240 kbps as the minimum value regarding the information of the necessary bit rate of the codec to support Include in notice.

  The network bandwidth adjustment unit 105 that has received the bandwidth securing request from the VoIP communication processing unit 104 of the VoIP terminal 1 acquires communication quality information of each VoIP terminal in the past in the VoIP communication quality storage unit 106 of the own VoIP terminal 1 The acquisition request is sent out (sequence S2), and communication quality information of each VoIP terminal in the past is acquired from the VoIP communication quality storage unit 106 that has received the acquisition request (sequence S3). In the registration example of the VoIP communication quality registration table 107 in FIG. 3, each VoIP during communication at each date and time of 16:50, 16:51, 16:52, 16:53, and 16:54 of 2017/03/02. Communication quality information of the terminal (information on used codec and effective bit rate) is obtained.

  The network band adjustment unit 105 of the VoIP terminal 1 is actually used on each date and time to obtain the maximum value of the used band of the past network band from the acquired communication quality information of each VoIP terminal in the past. Calculate the sum of effective bit rates of VoIP terminals. As a result, in the registration example of FIG. 3, a total of 1,206 kbps (= 301 kbps + 300 kbps + 302 kbps + 303 kbps) of effective bit rates of VoIP terminals which are measurement results at 16:52 on 2017/03/02 is the used bandwidth of the past network bandwidth. Acquired as the maximum value.

  Furthermore, in order to obtain the latest network bandwidth usage, the network bandwidth adjustment unit 105 of the VoIP terminal 1 is configured for each VoIP terminal at 16:54, one minute before 16:55 of the current date and time 2017/03/02. Find the sum of effective bit rates. As a result, in the registration example of FIG. 3, the total sum of 768 kbps (= 384 kbps × 2) of effective bit rates of VoIP terminals which are measurement results at 16: 54 of 2017/03/02 is the latest network bandwidth usage It is acquired as Therefore, the remaining bandwidth 438 kbps obtained by subtracting the latest network bandwidth usage 768 kbps from the maximum value of 1,206 kbps used in the past network bandwidth is the surplus of the current network bandwidth of the network 10 (the network bandwidth adjustment unit 105 That is, it is acquired as the current surplus network band).

  In addition, the network bandwidth adjustment unit 105 of the VoIP terminal 1 is configured such that the minimum value of the required bit rate of the support codec included and notified of in the bandwidth securing request from the VoIP communication processing unit 104 is 240 kbps, At least twice the minimum value, ie 480 kbps (= 240 kbps × 2), is required to communicate with the terminal 2 in both directions, so the current surplus network bandwidth of the network 10 is insufficient at 438 kbps. It is determined that there is.

  Therefore, the network band adjustment unit 105 of the VoIP terminal 1 recognizes that it is necessary to receive network bandwidth flexibility from the VoIP terminal currently in communication using the network band, and the current communication state. Among the VoIP terminals in, the VoIP terminal which is the partner to request the accommodation of the network bandwidth is sequentially selected according to a predetermined order. For example, to the VoIP terminal 4 and the VoIP terminal 3 in VoIP communication, first, a band accommodation request for requesting accommodation of the network band is transmitted via the network 10 (sequence S4). As the predetermined order, for example, referring to the VoIP communication quality registration table 107 of FIG. 3, the order of VoIP terminals using many network bandwidths as the latest VoIP communication state information close to the current time Do.

  When the communication unit 101 of the VoIP terminal 3 receives the bandwidth accommodation request from the VoIP terminal 1, the bandwidth accommodation request is handed over to the network bandwidth adjustment unit 105 of the own VoIP terminal 3. When the bandwidth adjustment request of the VoIP terminal 3 is received, the network bandwidth adjustment unit 105 of the VoIP terminal 3 sends out the accommodation requirement of the network bandwidth in use to the VoIP communication processing unit 104 of the own VoIP terminal 3 (sequence S5). When the VoIP communication processing unit 104 of the VoIP terminal 3 receives the accommodation request, the VoIP communication processing unit 104 refers to the support codec registration table 109 stored in the VoIP communication processing unit 104, and the currently used codec H.H. Check if the H.264 supports codecs that use a bandwidth less than the required bit rate of 384 kbps required.

  As a reference result of the support codec registration table 109 of the own VoIP terminal 3, as shown in FIG. 5, when supporting a codec that uses a band smaller than the currently used 384 kbps, among the support codecs Extract the necessary bit rate of the currently used 384 kbs next-larger codec. That is, in the registration example of the support codec registration table 109 of FIG. It is necessary to extract the H.264 required bit rate of 240 kbps. As a result, the VoIP communication processing unit 104 of the VoIP terminal 3 causes the VoIP communication processing unit 104 of the VoIP terminal 4 of the communication partner to transmit the codec H.2 via the network 10. Send a codec change request requesting a change to the H.264 required bit rate of 240 kbps (sequence S6).

  When the VoIP communication processing unit 104 of the VoIP terminal 4 receives the codec change request from the VoIP terminal 3, the VoIP communication processing unit 104 refers to the support codec registration table 109 stored in the VoIP communication processing unit 104, Codecs that are required to be changed Check if it supports H.264 required bit rate 240 kbps. As a reference result of the support codec registration table 109 of the own VoIP terminal 4, as shown in FIG. If H.264 is supported, codec H.264 is used. A codec change acceptance response indicating that the change to H.264 (the required bit rate of 240 kbps) has been accepted is returned to the VoIP communication processing unit 104 of the VoIP terminal 3 of the request source via the network 10 (sequence S7) .

  When the VoIP communication processing unit 104 of the VoIP terminal 3 receives the codec change acceptance response returned from the VoIP terminal 4 at the other end of the communication, the codec used for communication with the VoIP terminal 4 is selected from H.V. H.264 codec required bit rate 240 kbps A network bandwidth (flexibility bandwidth) for adapting the network bandwidth 288 kbps (= (384-240) kbps × 2) removed by the change of codec to the H.264 codec to the VoIP terminal 1 of the request source of the bandwidth accommodation request Calculated as). Then, the flexible band response including the information of the network band (flexible band) of 288 kbps to be accommodated and the information of the terminal identifier (IP address) of the VoIP terminal 4 indicating the other party of communication is Return to the network band adjustment unit 105 of the own VoIP terminal 3 that was the request source (sequence S8)

  When the network band adjustment unit 105 of the VoIP terminal 3 receives the accommodation band response from the VoIP communication processing unit 104 of the transmission destination of the accommodation request, the band reception of the accommodation band response received from the VoIP terminal 1 is performed. It is returned as the network bandwidth accommodation response information to the accommodation request to the network bandwidth adjusting unit 105 of the VoIP terminal 1 of the request source of the bandwidth accommodation request via the network 10 (sequence S9).

  When the network band adjustment unit 105 of the VoIP terminal 1 receives the network band accommodation response information from the network band adjustment unit 105 of the VoIP terminal 3, the network band accommodation response information included in the network band accommodation response information ) A total bandwidth of 726 kbps (= 288 kbps + 438 kbps) added to 438 kbps calculated in the previous sequence S 4 as 288 kbps as the surplus bandwidth of the current network bandwidth of the network 10, the surplus network bandwidth of the current network 10 after bandwidth interchange Calculated as (ie, surplus network bandwidth after update).

  Then, the network bandwidth adjusting unit 105 of the VoIP terminal 1 calculates the updated surplus network bandwidth 726 kbps to be larger than 480 kbps which is twice the minimum value 240 kbps of the required bit rate of the support codec specified in the bandwidth securing request. If it is confirmed that the network bandwidth has been reached, the target network surplus bandwidth is secured by the network bandwidth (flexibility bandwidth) which is accommodated from the VoIP terminal 3 currently in the state of being in VoIP communication using the network bandwidth. Therefore, it is determined that it is not necessary to make a further bandwidth accommodation request for VoIP terminals in other VoIP communications.

  Therefore, the network band adjustment unit 105 of the VoIP terminal 1 has sent the band securing request including the band securing success response including the surplus network band of the current network 10 after band accommodation (that is, the surplus network band after updating) 726 kbps. It is returned to the VoIP communication processing unit 104 of the own VoIP terminal 1 (sequence S10).

  The VoIP communication processing unit 104 of the VoIP terminal 1 refers to the necessary bit rate 108b of the support codec registration table 108 of FIG. 4 to determine the current surplus network bandwidth included in the bandwidth securing response from the network bandwidth adjustment unit 105. Decide which codec to use, with 726 kbps as the upper limit. In the case of the registration example of FIG. 4, the required bit rate 108 b is a codec H.264 having a maximum value of 384 kbps. Since H.264 requires a bandwidth of 768 kbps, which is twice that of bidirectional communication, it exceeds the current surplus network bandwidth of 726 kbps and can not be used. On the other hand, the required bit rate 108b is 240 kbps (minimum value) codec H.264. In the case of H.264, even if the bandwidth is 480 kbps doubled, it falls within the current surplus network bandwidth of 726 kbps.

  Therefore, the VoIP communication processing unit 104 of the VoIP terminal 1 uses the codec H.264 with a required bit rate 108 b of 240 kbps as the codec to be used. The H.264 is selected, and negotiation for starting VoIP communication is performed with the VoIP communication processing unit 104 of the VoIP terminal 2 (sequence S11). As a result, when a response in which the VoIP communication processing unit 104 of the VoIP terminal 2 accepts the start of the VoIP communication is returned, VoIP communication between the VoIP terminal 1 and the VoIP terminal 2 is started.

  Then, when the VoIP communication quality measurement unit 103 of each VoIP terminal is in the state of being in VoIP communication, for example, when reaching a predetermined measurement cycle of 16:55 of 2017/03/02, VoIP in the own VoIP terminal respectively The communication quality of the communication (codec used and effective bit rate) is measured, and the measurement result is notified to the VoIP communication quality registration unit 102 of the own VoIP terminal, and the VoIP communication quality registration table 107 of the VoIP communication quality storage unit 106 While registering, it broadcasts to the network 10 to request registration of the VoIP communication quality registration table 107 of another VoIP terminal connected to the network 10.

  As a result, for example, in the VoIP communication quality registration table 107 of the VoIP terminal 1, communication quality is registered such that the date and time 107a on the lowermost row side of FIG. Be done. That is, the VoIP terminal 3 in which the terminal identifier 107b on the VoIP terminal side which has already been in communication with each other and which becomes the VoIP terminal that has the band adapted according to the bandwidth accommodation request from the VoIP terminal 1 is '192.168.0.3' For both VoIP terminal 4 and '192.168.0.4', the bandwidth is reduced from 384 kbps to 240 kbps in the measurement cycle one minute earlier, as shown in codec 107 d and effective bit rate 107 e. Let the codec H. H.264 (necessary bit rate 240 kbps) and effective bit rate 240 kbps are registered as communication quality. Also, by transmitting the bandwidth accommodation request to the VoIP terminal 3 and accommodating the bandwidth by transmitting the bandwidth accommodation request, the VoIP terminal 1 and the terminal identifier 107b that newly starts VoIP communication are '192.168.0.1' As shown in the used codec 107d and the effective bit rate 107e, both of the VoIP terminals 2 of 192.168.0.2 'as a result of using the newly secured network bandwidth of 240 kbps, respectively. H.264 (necessary bit rate 240 kbps) and effective bit rate 240 kbps are registered as communication quality.

  In the sequence S10, the surplus network bandwidth after update after the bandwidth is accommodated by the bandwidth accommodation request to the VoIP terminal 3 currently in the state of VoIP communication using the network bandwidth is specified by the bandwidth securing request. If it has not reached more than the 480 kbps band (in other words, the target surplus network band) obtained by doubling the required bandwidth (that is, the minimum required bit rate of the supported codec, 240 kbps), in a predetermined order, The operation of further transmitting the bandwidth accommodation request to another VoIP terminal in the VoIP communication state is repeated.

  Then, even after the bandwidth securing request for all VoIP terminals in the state of VoIP communication is repeatedly performed, if the excess network bandwidth after update has not reached the target excess network bandwidth or more, VoIP terminal 1 The network band adjustment unit 105 of the VoIP communication of the own VoIP terminal 1 that has sent the band securing request, in place of the band securing success response, a band securing failure response indicating that the required band has failed to be secured. The processing unit 104 is returned (sequence S10). Therefore, since the VoIP communication processing unit 104 of the VoIP terminal 1 that has received the band securing failure response can not use any of the supported codecs in the surplus network band after the current update, it is assumed that the communication fails as a transmission failure. The call origination process to the VoIP terminal 2 of the other party is canceled.

(Description of the effect of the present embodiment)
As described above in detail, in the present embodiment, the following effects can be achieved.

  First, when a VoIP terminal (generally a wireless communication terminal) newly starts wireless communication, it is used between VoIP terminals based on the past network bandwidth usage records registered in each VoIP terminal Since a mechanism to finely adjust the network bandwidth to be used is adopted, even in a wireless communication environment where there is no dedicated network device equipped with a Quality of Service (QoS) function etc., between VoIP terminals. It is possible to fine-tune the dynamic adjustment on the network bandwidth. Thus, the corresponding VoIP terminal can perform wireless communication with a desired communication quality (communication speed) or a communication quality (communication speed) close to the desired communication quality (communication speed) and is dedicated. It is possible to eliminate the process and cost for installing network devices.

  In other words, when a wireless communication terminal tries to communicate in a wireless communication environment where there is no dedicated network device provided with a Quality of Service (QoS) function or the like, other wireless communication is already performed. Since the network bandwidth is dynamically adapted (coordinated) between the wireless communication terminals even under the situation where many network bandwidths are occupied by the terminal, the corresponding wireless The communication terminal can perform wireless communication with a desired communication quality (communication speed) or a communication quality (communication speed) close to the desired communication quality (communication speed), and a step of installing a dedicated network device・ You can make the cost unnecessary.

  Second, as described above, when a VoIP terminal newly starts wireless communication, the network bandwidth used between VoIP terminals is determined based on the past network bandwidth usage records registered in each VoIP terminal. Since a mechanism for fine-tuning is adopted, there is a possibility that the communication quality of many VoIP terminals may be deteriorated due to lack of network bandwidth (for example, call voice may be interrupted, communication video may be stopped, etc.) Can be reduced.

(Other embodiments)
In the above description of the embodiment, as exemplified in the VoIP communication quality registration table 107 of FIG. 3, the case of using the used codec 107 d and the effective bit rate 107 e as the VoIP communication quality information has been described. Not limited to this case. For example, as information indicating VoIP communication quality, VoIP packet loss rate, fluctuation of VoIP packet arrival time (jitter occurrence rate), etc. (generally, communication packet loss rate in radio communication or fluctuation of communication packet arrival time (jitter occurrence rate) Etc.) may be used additionally or in some cases instead of the above used codec and effective bit rate.

  Further, in the above description of the embodiment, in order to obtain the maximum value of the used band of the past network band, the registration information of the VoIP communication quality registration table 107 of FIG. 3 is searched, and 16 of 2017/03/02. The maximum value of the used bandwidth of the past network bandwidth acquired by acquiring the total 1,206 kbps of the effective bit rate of each VoIP terminal which is the measurement result in 52: of the network bandwidth permitted to be used in the network 10 Although the case has been described where the maximum available bandwidth is used, the present invention is not limited to such a case. For example, in addition to the VoIP communication quality registration table 107 shown in FIG. 3, a maximum available network band registration table for registering the maximum value of available network bands is provided, and the maximum available band of the network band is determined. The maximum available network bandwidth registered in the maximum available network bandwidth registration table may be referred to.

  Then, as an opportunity to register in the maximum available network band registration table, for example, every time the registration cycle for registering the VoIP communication quality in the VoIP communication quality registration table 107 of FIG. It may be checked whether the sum is the maximum value of the past used bandwidth, and if it is the maximum value, the maximum available network bandwidth registration table may be overwritten and registered. Alternatively, the maximum value of the effectively usable network bandwidth permitted as the network 10, that is, the effective maximum available network bandwidth may be set and registered in advance in the maximum available network bandwidth registration table. Also good.

  Further, in the above description of the embodiment, an example in which the measurement period of VoIP communication quality in VoIP communication quality measurement unit 103, that is, the registration period of VoIP communication quality storage unit 106 is 1 minute has been described. The present invention is not limited to such a case, and a cycle longer than one minute may be used, or a cycle shorter than one minute may be used.

  Also, in the above description of the embodiment, the case of the VoIP communication system performing VoIP communication has been described as an example of the wireless communication system, but the present invention is not limited to such case, that is, IP (Internet) Protocol (Protocol) A wireless communication system that implements any application may be used as long as the network performs wireless communication in a procedure compliant with the protocol, and a wireless communication terminal.

  The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such an embodiment is merely an example of the present invention and does not limit the present invention. It will be readily understood by those skilled in the art that various modifications and variations can be made according to a particular application without departing from the scope of the present invention.

1 VoIP terminal 2 VoIP terminal 3 VoIP terminal 4 VoIP terminal 5 VoIP terminal 6 VoIP terminal 9 VoIP server 10 Network 100 VoIP terminal 101 Communication unit 102 VoIP communication quality registration unit 103 VoIP communication quality measurement unit 104 VoIP communication processing unit 105 Network bandwidth adjustment Section 106 VoIP communication quality storage section 107 VoIP communication quality registration table 107a Date 107b Terminal identifier 107c Codec 107e used Effective bit rate 108 Support codec registration table 108a Codec 108b Required bit rate 109 Support codec registration table 109a Codec 109b Required bit rate

Claims (10)

In a wireless communication system for performing wireless communication between wireless communication terminals connected to a network,
The wireless communication terminal is
Communication for registering information on the communication quality of all wireless communication terminals connected to the network and in a wireless communication state, together with a terminal identifier for specifying each wireless communication terminal, in a communication quality registration table for each predetermined registration cycle Quality registration means,
When the self-wireless communication terminal is in the wireless communication state, the effective network band being used is measured as the communication quality of the self-wireless communication terminal in each measurement cycle determined in advance, and information about the measured communication quality is While notifying the communication quality registration means to request registration in the communication quality registration table, broadcast to the network to notify all other wireless communication terminals connected to the network, and others Communication quality measurement means for requesting registration in the communication quality registration table provided in all of the wireless communication terminals of
Based on the information on the communication quality registered in the communication quality registration table, the wireless communication of the desired communication quality by adapting the network band with another communication terminal currently in the wireless communication state Network bandwidth adjustment means for securing the necessary network bandwidth required to
Furthermore, the wireless communication terminal
When trying to newly start wireless communication with the other party,
In the network bandwidth adjusting means, referring to the communication quality registration table, another wireless communication terminal is already in wireless communication, and the network bandwidth of the network is used, and the network bandwidth is not in use. When it is determined that there is no band remaining in the necessary network band required by the wireless communication terminal as the surplus network band of the wireless communication terminal, and the other wireless communication terminal in the wireless communication state is 1 Or, if there are a plurality of them, transmit, in a predetermined order, a bandwidth accommodation request requesting accommodation of the network bandwidth in use to the other wireless communication terminal in the wireless communication state,
And, when it receives, from the other wireless communication terminal to which the bandwidth accommodation request is sent, information on an accommodation bandwidth indicating a network bandwidth to be accommodated to the wireless communication terminal.
The network band adjustment means determines whether or not the post-update surplus network band, which is the result of adding the accommodation band to the surplus network band, is in a state above the necessary network band,
When it is determined that the surplus network band after update is in the state of the required network band or more, the necessary network band is secured as a new network band for wireless communication, and wireless communication with the communication partner is started. A wireless communication system characterized in that. The wireless communication terminal is
When it is determined in the network band adjustment means that the post-update surplus network band has not reached the required network band, the other wireless communication terminals in the wireless communication state are determined in the predetermined order in advance. The transmission of the band accommodation request to the other wireless communication terminal is sequentially performed until the post-update surplus network band is in the state of the required network band or more,
As a result, when it is determined that the post-update surplus network band has reached the required network band or more, the necessary network band is secured as a new network band for wireless communication in the wireless communication terminal. Start wireless communication with the other party,
On the other hand, after the transmission of the bandwidth accommodation request to the other wireless communication terminal is performed for all the other wireless communication terminals in the wireless communication state in the network band adjusting means in the predetermined order, The wireless communication system according to claim 1, wherein, if the post-update surplus network band does not reach the required network band, the transmission operation to the communication partner is stopped. The network bandwidth adjustment means is configured to transmit the bandwidth accommodation request to the other wireless communication terminal, the size of the network bandwidth in use of the other wireless communication terminal registered in the communication quality registration table. The wireless communication system according to claim 1 or 2, characterized in that the steps are performed in order. The wireless communication terminal is
It has a support codec registration table that registers information on the codec used for wireless communication and the required bandwidth in the codec,
In the wireless communication state, when the bandwidth accommodation request is received from another wireless communication terminal,
In the network bandwidth adjustment means, referring to the support codec registration table, if a codec operating in a required band smaller than the required band required by the currently used codec is registered, the required band is small. Send a codec change request to the other party in wireless communication to change to wireless communication using the codec of
When a codec change acceptance response to the effect that the codec change request has been accepted is received from the communication party, the required bandwidth for the codec used for wireless communication with the communication party is smaller than that of the codec that has been used until now Switching to the codec that operates in step b, and adapting the difference between the required band in the codec used until now and the required band in the codec after switching to the other wireless communication terminal that is the transmission source of the band accommodation request A bandwidth securing success response including information on the secured bandwidth secured as the flexible bandwidth to be created, and returning the response to the other wireless communication terminal of the transmission source of the bandwidth flexible request. The wireless communication system according to any one of claims 1 to 3. The wireless communication terminal is
In the wireless communication state, when the bandwidth accommodation request is received from another wireless communication terminal,
In the network bandwidth adjustment means, referring to the support codec registration table, if the codec operating in the required bandwidth smaller than the required bandwidth required by the currently used codec is not registered, or the current usage is used Even when a codec operating in a required band smaller than the required band required by the codec in the middle is registered, a response to reject the codec change request is received from the communication partner Information indicating that there is no band to be accommodated in the other wireless communication terminal of the transmission source of the band accommodation request as the band securing failure response, the other wireless communication terminal of the transmission source of the band accommodation request The wireless communication system according to claim 4, wherein the wireless communication system returns to the wireless communication system. The wireless communication terminal is
As the unused surplus network band,
With reference to the communication quality of each wireless communication terminal registered in the communication quality registration table for each registration cycle in the past, the total sum of the effective network bandwidth of each wireless communication terminal tabulated for each registration cycle is maximum Using the bandwidth obtained by subtracting the sum of the effective network bandwidths of each wireless communication terminal in the latest registration cycle from the maximum used network bandwidth to be used or the effective maximum usage permitted to be used as the network The wireless communication system according to any one of claims 1 to 5, wherein a band obtained by subtracting the sum of the effective network bands of the wireless communication terminals in the latest registration cycle from the available network band is used. As the communication quality to be measured by the communication quality measuring means, in addition to the effective network bandwidth, a communication packet loss rate or a fluctuation of communication packet arrival time, or a communication packet loss rate and a communication packet arrival time fluctuation are further added The wireless communication system according to any one of claims 1 to 6, characterized in that: A wireless communication terminal that performs wireless communication via a network,
Communication for registering information on the communication quality of all wireless communication terminals connected to the network and in a wireless communication state, together with a terminal identifier for specifying each wireless communication terminal, in a communication quality registration table for each predetermined registration cycle Quality registration means,
When the self-wireless communication terminal is in the wireless communication state, the effective network band being used is measured as the communication quality of the self-wireless communication terminal in each measurement cycle determined in advance, and information about the measured communication quality is While notifying the communication quality registration means to request registration in the communication quality registration table, broadcast to the network to notify all other wireless communication terminals connected to the network, and others Communication quality measurement means for requesting registration in the communication quality registration table provided in all of the wireless communication terminals of
Based on the information on the communication quality registered in the communication quality registration table, the wireless communication of the desired communication quality by adapting the network band with another communication terminal currently in the wireless communication state Network bandwidth adjustment means for securing the necessary network bandwidth required to
When trying to newly start wireless communication with the other party,
In the network bandwidth adjusting means, referring to the communication quality registration table, another wireless communication terminal is already in wireless communication, and the network bandwidth of the network is used, and the network bandwidth is not in use. When it is determined that there is no band remaining in the necessary network band required by the wireless communication terminal as the surplus network band of the wireless communication terminal, and the other wireless communication terminal in the wireless communication state is 1 Or, if there are a plurality of them, transmit, in a predetermined order, a bandwidth accommodation request requesting accommodation of the network bandwidth in use to the other wireless communication terminal in the wireless communication state,
And, when it receives information on the flexible band indicating the network band to be flexible from the other wireless communication terminal to which the band flexibility request is sent,
The network band adjustment means determines whether or not the post-update surplus network band, which is the result of adding the accommodation band to the surplus network band, is in a state above the necessary network band,
If it is determined that the surplus network band after update is in the state of the required network band or more, the necessary network band is secured as a new network band for wireless communication, and wireless communication with the communication partner is started. A wireless communication terminal characterized by A network bandwidth control method in a wireless communication system for performing wireless communication between wireless communication terminals connected to a network, the method comprising:
The wireless communication terminal is
Communication for registering information on the communication quality of all wireless communication terminals connected to the network and in a wireless communication state, together with a terminal identifier for specifying each wireless communication terminal, in a communication quality registration table for each predetermined registration cycle Quality registration step,
When the self-wireless communication terminal is in the wireless communication state, the effective network band being used is measured as the communication quality of the self-wireless communication terminal in each measurement cycle determined in advance, and information about the measured communication quality is In the communication quality registration step, it is requested to register in the communication quality registration table, and broadcast to the network to notify all other wireless communication terminals connected to the network, and the other wireless A communication quality measurement step of requesting registration in the communication quality registration table provided in all of the communication terminals;
Based on the information on the communication quality registered in the communication quality registration table, the wireless communication of the desired communication quality by adapting the network band with another communication terminal currently in the wireless communication state Network bandwidth adjustment step to secure the necessary network bandwidth required to
Furthermore, the wireless communication terminal
When trying to newly start wireless communication with the other party,
In the network bandwidth adjustment step, referring to the communication quality registration table, another wireless communication terminal is already in wireless communication, and the network bandwidth of the network is used, and the network is not in use. When it is determined that there is no band remaining in the necessary network band required by the wireless communication terminal as the surplus network band of the wireless communication terminal, and the other wireless communication terminal in the wireless communication state is 1 Or, if there are a plurality of them, transmit, in a predetermined order, a bandwidth accommodation request requesting accommodation of the network bandwidth in use to the other wireless communication terminal in the wireless communication state,
And, when it receives, from the other wireless communication terminal to which the bandwidth accommodation request is sent, information on an accommodation bandwidth indicating a network bandwidth to be accommodated to the wireless communication terminal.
In the network band adjustment step, it is determined whether or not the updated surplus network band, which is the result of adding the accommodation band to the surplus network band, is in the state of the required network band or more.
If it is determined that the surplus network band after update is in the state of the required network band or more, the necessary network band is secured as a new network band for wireless communication, and wireless communication with the communication partner is started. A network bandwidth control method characterized by The wireless communication terminal is
If it is determined in the network band adjustment step that the surplus network band after the update has not reached the necessary network band, the other wireless communication terminals in the wireless communication state are determined in the predetermined order in advance. The transmission of the band accommodation request to the other wireless communication terminal is sequentially performed until the post-update surplus network band is in the state of the required network band or more,
As a result, when it is determined that the post-update surplus network band has reached the required network band or more, the necessary network band is secured as a new network band for wireless communication in the wireless communication terminal.
The wireless communication terminal starts wireless communication with the communication partner,
On the other hand, in the network bandwidth adjustment step, an operation of transmitting the bandwidth accommodation request to the other wireless communication terminal in the next order in the predetermined order in the predetermined order is performed by the other wireless communication terminal in the wireless communication state. 10. The network band control according to claim 9, wherein, even after repeating all the operations, when the surplus network band after update has not reached the required network band, the transmission operation to the communication partner is stopped. Method.

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