JP2007208829A - Radio communication system and radio communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly convenient radio communication system capable of reducing bands used by transmitting-side and receiving-side access point devices for radio communication and accepting a transmission request from the other new radio terminal. <P>SOLUTION: Transmitting-side band data are indicative of a whole band amount required for radio communication determined based on a CODEC system designated by the other radio terminal which requests transmission to a transmitting-side access point device and a CODEC system set to a transmitting-side radio terminal. When the transmitting-side band data exceed first transmitting-side threshold data indicative of a band amount that becomes a reference for determining a necessity to change the CODEC system set to each radio terminal by radio communication, the radio communication is held. the CODEC system set to each radio terminal by holding is changed into a CODEC system in which bands used therefor are reduced and after the change, the holding of the radio communication under holding is canceled. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wireless communication system having an access point device capable of wireless communication with an allowable number of wireless terminals determined according to a bandwidth amount, and more particularly, wireless communication according to a bandwidth amount used by the access point device. The present invention relates to a wireless communication system that changes codec systems used by a transmitting wireless terminal and a receiving wireless terminal.

A wireless communication system having an access point device capable of wireless communication with an allowable number of wireless terminals determined according to the bandwidth is known. For example, in Patent Document 1 below, when an access point device that performs wireless communication with an allowable number of wireless terminals determined according to the bandwidth amount further receives a call request from another wireless terminal, the other wireless terminal There has been disclosed a wireless communication system that detects a shortage of bandwidth necessary for wireless communication with a terminal and performs a communication failure notification to another wireless terminal that has issued a transmission request.
JP 2005-229591 A

  However, the wireless communication system described above has the following problems to be solved. That is, when a request is made for transmission from another wireless terminal, if the requested access point apparatus has already performed wireless communication with an allowable number of wireless terminals determined according to the bandwidth, any of the wireless terminals that are performing wireless communication Until wireless communication with the KAWA access point device is terminated, other wireless terminals that have made a call origination cannot perform wireless communication via the access point device, and there was a problem in convenience.

The present invention adopts the following configuration in order to solve the above points.
<Configuration 1>
In a wireless communication system comprising an access point device that relays communication between a wireless terminal on a transmission side and a reception side that uses a set codec method, and a call control device that controls the communication, the access point device includes the setting A storage unit that holds first threshold data indicating a bandwidth amount serving as a reference for determining whether or not a change in the codec method performed is necessary, and codec method data indicating a codec method specified by another wireless terminal Upon receipt of the given call request information, it indicates the total amount of bandwidth required for wireless communication between the calling wireless terminal and the other wireless terminal based on the designated codec method and the set codec method. When the transmission side band acquisition unit for acquiring transmission side band data and the transmission side band data are larger than the first threshold data, the setting A communication enable / disable determining unit that determines that communication is possible due to a change in the codec method, and the transmission further including change instruction data that instructs to change the set codec method when the communication enable / disable determination unit determines that communication is possible A relay communication unit that transmits request information to the call control device, and when the call control device receives the call request information to which the change instruction data is added, the call control device When a hold instruction signal for instructing to hold the communication is transmitted and hold response information is received from each wireless terminal that has received the hold instruction signal, a codec method that uses less bandwidth than the set codec method is used. And a controller that transmits the hold release instruction information to which the codec method data shown is transmitted to each wireless terminal.
<Configuration 2>
In the wireless communication method of a wireless communication system, comprising: an access point device that relays communication between a transmitting side and a receiving side wireless terminal that uses a set codec method; and a call control device that controls the communication, the access point device Indicates a step of storing first threshold data indicating a bandwidth amount serving as a reference for determining whether or not the change of the set codec scheme is necessary, and a codec scheme designated by another wireless terminal Upon receipt of the transmission request information to which the codec method data is added, all of the wireless communication required for the transmission side wireless terminal and the other wireless terminals are performed based on the designated codec method and the set codec method. A transmitting-side band acquisition step of acquiring transmitting-side band data indicating a bandwidth, and the transmitting-side band data is the first threshold value A communication enable / disable determining step that determines communication is possible by changing the set codec method, and a change that instructs to change the set codec method when the communication enable / disable determining unit determines that communication is possible A relay communication step of transmitting the call request information further provided with instruction data to the call control device, and the call control device receives the call request information provided with the change instruction data, When a hold instruction signal for instructing hold of the communication is transmitted to each wireless terminal on the receiving side, and hold response information is received from each wireless terminal that has received the hold instruction signal, A control step of transmitting to each wireless terminal the hold release instruction information to which codec method data indicating a codec method with a small amount of used bandwidth is added. And wherein the Rukoto.

  In the wireless communication system of the present invention, wireless communication is determined based on a codec method designated by another wireless terminal that has issued a transmission request to the originating access point device and a codec method currently set in the originating wireless terminal. The first outgoing call indicating the bandwidth amount that is a reference for determining whether or not the change of the codec method being set in each wireless terminal in wireless communication is necessary for the outgoing side bandwidth data indicating the total bandwidth required for If the threshold data is exceeded, the communication is put on hold and the codec method set for each wireless terminal on hold is changed to a codec method that uses less bandwidth. After that, each wireless terminal continues wireless communication using a codec method that uses less bandwidth after the change. Scan point apparatus can be reduced bandwidth which has been used for wireless communication. Therefore, it is possible to provide a highly convenient wireless communication system that can accept a call request from another new wireless terminal.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

<Configuration of Example>
FIG. 1 is a block diagram showing a radio communication system of the present invention.

  As shown in FIG. 1, the wireless communication system of this embodiment includes a call control device 10, access point devices 20 and 30, other wireless terminals 40 and 50, a plurality of wireless terminals 60, and a network 80.

  The network 80 is a communication line that connects between the call control device 10 and the access point devices 20 and 30.

  The other radio terminal 40 is a radio telephone on the transmission side, and includes a control unit 41, a storage unit 42, a codec unit 43, a transmission side communication unit 44, and a transmission side method setting unit 45.

  The storage unit 42 is a memory such as an HDD, and stores terminal identification data. The terminal identification data is data for identifying itself such as a telephone number.

  Other wireless terminals 40, similar to the prior art, store the data stored in the storage unit 42 with respect to the access point device to be relayed during wireless communication so that the call control device 10 manages its own position, as will be described later. Terminal identification data is sent periodically.

  The other radio terminal 50 is an incoming-side radio telephone, and includes a control unit 51, a storage unit 52, a codec unit 53, an incoming-side communication unit 54, and an incoming-side system setting unit 55.

  The storage unit 52 is a memory such as an HDD, and stores terminal identification data. The terminal identification data is data for identifying itself such as a telephone number.

  Other wireless terminals 50, similar to the prior art, store access points in the storage unit 52 with respect to access point devices to be relayed during wireless communication so that the call control device 10 can manage its own position, as will be described later. Terminal identification data is sent periodically.

  The access point device 20 is a device that relays between each wireless terminal and the call control device 10, and includes a control unit 21, a storage unit 22, a transmission side band acquisition unit 23, a transmission side communication availability determination unit 24, and a transmission side relay communication unit. 25. A transmission side update availability determination unit 26 and a transmission side data update unit 27 are provided.

  The storage unit 22 is a memory such as an HDD and stores device identification data, first transmission side threshold data, second transmission side threshold data, method change status data, use band data, and a method band amount correspondence table. .

  The device identification data is data for identifying itself such as an IP address, for example.

  The method change status data is data indicating that the access point apparatus 20 indicates the codec method change status as “not changed” or “being changed”, and indicates “not changed” in the initial setting.

  The first transmission-side threshold data is data indicating a bandwidth amount serving as a threshold for determining whether or not to change the codec system of each wireless terminal.

  The second transmission side threshold data is data indicating a bandwidth amount serving as a threshold for determining whether or not a transmission request from each wireless terminal should be limited.

  The used bandwidth data is data indicating the total amount of bandwidth used by each wireless terminal that is currently performing wireless communication via the access point device 20, and is described below by the transmission side data update unit 27. Updated.

  The system bandwidth correspondence table is a table in which bandwidth data indicating the bandwidth to be used is associated with codec method data indicating the codec method. For example, the codec method data indicating the codec method (G.711) On the other hand, the bandwidth data indicating the bandwidth (8k) is associated with the bandwidth data indicating the bandwidth (64k) and the codec format data indicating the codec format (G.729).

  When the access point device 20 receives terminal identification data indicating the telephone number of the wireless terminal from each wireless terminal managed by the wireless communication device, the access point device 20 receives the received terminal identification data and the device identification of the storage unit 22. Data is transmitted to the call control device 10. As a result, the call control device 10 can specify that the wireless terminal indicated by the terminal identification data can be wirelessly communicated via the access point device 20, as will be described later.

  The access point device 30 is a device that relays between each wireless terminal and the call control device 10, and includes a control unit 31, a storage unit 32, a reception side band acquisition unit 33, a reception side communication availability determination unit 34, and a reception side relay communication unit. 35, a receiving side update availability determination unit 36 and a receiving side data update unit 37 are provided.

  The storage unit 32 is a memory such as an HDD and stores device identification data, first incoming side threshold data, second incoming side threshold data, method change status data, used bandwidth data, and a method bandwidth correspondence table. .

  The device identification data is data for identifying itself such as an IP address, for example.

  The method change status data is data indicating that the access point device 30 indicates the codec method change status as “not changed” or “being changed”, and indicates “not changed” in the initial setting.

  The first incoming side threshold data is data indicating a bandwidth amount serving as a threshold for determining whether or not to change the codec scheme of each wireless terminal based on the bandwidth amount used by the access point device.

  The second incoming side threshold data is data indicating the amount of bandwidth that serves as a threshold for determining whether or not the transmission request from each wireless terminal should be limited based on the amount of bandwidth used by the access point device.

  The used bandwidth data is data indicating the total amount of bandwidth used by each wireless terminal that is currently performing wireless communication via the access point device 30, and will be described later by the incoming-side data update unit 37. Updated.

  The system bandwidth correspondence table is a table in which, for each codec method data indicating a codec method, bandwidth amount data indicating a large amount to be used is associated, for example, codec method data indicating a codec method (G.711). On the other hand, the bandwidth data indicating the bandwidth (8k) is associated with the bandwidth data indicating the bandwidth (64k) and the codec format data indicating the codec format (G.729).

  When the access point device 30 receives terminal identification data indicating the telephone number of the wireless terminal from each wireless terminal managed by the wireless communication device, the access point device 30 and the device identification of the storage unit 32 are received. Data is transmitted to the call control device 10. As a result, the call control device 10 can specify that the wireless terminal indicated by the terminal identification data can be wirelessly communicated via the access point device 30, as will be described later.

  The call control device 10 is a device that establishes wireless communication between wireless terminals, and includes a control unit 11, a storage unit 12, a change necessity determination unit 13, a device specifying unit 14, a change control unit 15, and a communication control unit 16. Have.

  The storage unit 12 is a memory such as an HDD, and stores a method change correspondence table, a method change release correspondence table, an inter-terminal device correspondence list data, and a communication method management table.

  The system change correspondence table is a table in which, for each codec system data, codec system data that uses less bandwidth than the codec system data is associated with the codec system data. For example, a codec system (G .711 (= 64k)) as a change target, a codec method (G.729) having a sound quality equivalent to that of a mobile phone having a smaller bandwidth than the codec method data (G.711 (= 64k)). (= 8k)) is associated.

  The method change cancellation correspondence table is a table in which codec method data having a larger bandwidth than that of the codec method data is associated with each codec method data, for example, a codec method (sound quality equivalent to that of a mobile phone) ( G.729 (= 8k)), the codec method (G.729 (= 8k)) has the same sound quality as that of the fixed telephone having a larger bandwidth than the codec method data (G.729 (= 8k)). .711 (= 64k)) is associated.

  The inter-terminal device correspondence list data is data for the call control device 10 to specify an access point device to be relayed for wireless communication with each wireless terminal. As described above, each access point device is the same as described above. Each time the terminal identification data and device identification data of each wireless terminal is received from 20, 30, it is updated based on the received terminal identification data and device identification data of each wireless terminal.

  In the present embodiment, the storage unit 12 is associated with device identification data indicating the other wireless terminal 40 and device identification data indicating the access point device 20 with the terminal identification data indicating the wireless terminal 60, Assume that inter-terminal device correspondence list data in which device identification data indicating the access point device 30 is associated with terminal identification data indicating the wireless terminal 50 and terminal identification data indicating the wireless terminal 60 is stored.

  The communication method management table is a table for specifying the codec method used by each wireless terminal 60 currently in wireless communication by the call control device 10, and terminal identification data indicating each wireless terminal 60 currently in wireless communication. Each table is associated with codec method data indicating a codec method in use. In this embodiment, the communication method management table is updated by the control unit 11 as will be described later.

  The wireless terminal 60 is a wireless telephone that is performing wireless communication via either the access point device 20 or the access point device 30, and includes a control unit 61, a codec unit 62, a communication unit 63, a method setting unit 64, and a hold control unit 65. have.

  Hereinafter, the correlation between the call control device 10, the access point devices 20 and 30, the other wireless terminals 40 and 50, and the wireless terminal 60 in this embodiment will be described.

  In this embodiment, a plurality of wireless terminals 60 are connected to G.C. It is assumed that wireless communication is being performed using the codec method 711 and the method change status data in the storage unit 22 of the access point device 20 indicates “not changed”. Further, it is assumed that the method change status data in the storage unit 32 of the access point device 30 also indicates “not changed”.

  First, with respect to the access point device 20 that is in radio communication with a plurality of radio terminals 60, another radio terminal 40 is to perform radio communication with another radio terminal 50 in order to perform radio communication. A case will be described where transmission request information to which codec method data indicating the codec method 711 and terminal identification data indicating another wireless terminal 50 are added is transmitted.

  The control unit 41 of the other wireless terminal 40 is a unit that controls the other wireless terminal 40 as a so-called CPU, and the caller identifies the terminal number indicating the telephone number of the other wireless terminal 50 via an input unit (not shown). Data and G. When codec method data indicating the codec method 711 is input and a call request is instructed, terminal identification data and codec method data are transferred to the caller communication unit 44.

  The transmission side communication unit 44 performs data communication with an access point device capable of wireless communication. Upon receiving terminal identification data and codec method data, the transmission side communication unit 44 accesses the transmission request information to which the terminal identification data and codec method data are added. Transmit to the point device 20.

  The control unit 21 of the access point device 20 is a unit that controls the access point device 20 as a so-called CPU. Upon receiving call request information, the call request information is temporarily stored in a memory (not shown) and a new call request is made. The call request information is transferred to the caller-side band acquisition unit 23 in order to acquire caller-side band data indicating the total bandwidth required for communication including the performed wireless terminal.

  The transmission side band acquisition unit 23 is a unit that acquires transmission side band data, and holds the following transmission side band amount calculation formula in a memory (not shown).

  Transmission side bandwidth calculation formula = NT + ST (1)

  However, NT: Bandwidth data required for communication by a new wireless terminal, ST: Bandwidth data used.

  Upon receiving the transmission request information, the transmission side band acquisition unit 23 first refers to the method band amount correspondence table in the storage unit 22 based on the codec method data assigned to the transmission request information, and obtains the corresponding band amount data. At the same time, the use band data is acquired from the storage unit 22. And the transmission side zone | band acquisition part 23 applies the specified band amount data and the acquired use band data to said Formula (1), and acquires transmission side zone | band data.

  The transmission side communication availability determination unit 24 is a unit that determines communication availability according to the amount of bandwidth to be used. When the transmission side bandwidth acquisition unit 23 acquires the transmission side bandwidth data, first, the method change status data in the storage unit 22 is obtained. , Threshold data (= first transmission side threshold data or second transmission side threshold data) to be compared with the transmission side band data is determined. That is, when the method change status data indicates “not changed”, the band data comparison target is determined as the first transmission side threshold data, and when “change in progress” is indicated, the comparison target is determined as the second transmission side. Determined as threshold data.

  In this embodiment, since the method change status data indicates “not changed”, the comparison target of the band data is determined as the first transmission side threshold data.

  When the transmission side communication feasibility determination unit 24 determines the comparison target to be the first transmission side threshold data, comparison between the transmission side band data and the determined first transmission side threshold data is started, and the bandwidth amount indicated by the transmission side band data is When the bandwidth amount indicated by the first transmission side threshold data is smaller than that indicated by the first transmission side threshold data, it is determined that communication is possible. 729, it is determined that communication is possible.

  The transmission side data update unit 27 is a unit that updates each data in the storage unit 22. When the transmission side communication availability determination unit 24 determines that communication is possible, the transmission side data update unit 27 is based on the codec method data added to the transmission request information in the memory. Then, referring to the system bandwidth amount correspondence table of the storage unit 22, the corresponding bandwidth amount data is specified, and the bandwidth amount indicated by the identified bandwidth amount data is added to the used bandwidth data to update the used bandwidth data.

  On the other hand, the transmission side data update unit 27 is configured such that the transmission side communication availability determination unit 24 is a G. If it is determined that communication is possible due to the change in the codec method 729, the above-described use band data is updated, and the method change status data in the storage unit 22 is updated from “not changed” to “being changed”.

  The transmission side relay communication unit 25 is a unit that relays between each wireless terminal and the call control device 10. When the transmission side data update unit 27 updates only the use band data, the call control device 10 sends the transmission request information in the memory. When the transmission side data update unit 27 updates the use band data and the system change status data, the transmission request information to which the change instruction data for instructing to change the codec system is transmitted to the call control device 10. In this embodiment, transmission request information to which change instruction data is attached is transmitted to the call control device 10.

  For example, when a new transmission request is made to the access point device 20 from another wireless terminal (not shown) when the method change status data in the storage unit 22 is “being changed”, the transmission side communication availability determination unit 24 determines the comparison target with the acquired transmission side band data as the second transmission side threshold data, and starts comparison between the transmission side band data and the second transmission side threshold data, and indicates the transmission side band data. If the bandwidth amount is smaller than the bandwidth amount indicated by the second transmission side threshold data, it is determined that communication is possible. If the bandwidth amount indicated by the transmission side bandwidth data is larger than the bandwidth amount indicated by the second transmission side threshold data, communication is impossible. Is determined.

  When the caller-side communication availability determination unit 24 determines that communication is possible, the caller-side data update unit 27 refers to the method bandwidth correspondence table in the storage unit 22 based on the codec method data assigned to the call request information, The corresponding bandwidth data is specified, and the bandwidth indicated by the specified bandwidth data is added to the used bandwidth data to update only the used bandwidth data.

  When the transmission side data update unit 27 updates only the use band data, the transmission side relay communication unit 25 transmits the received transmission request information to the call control device 10. Thereafter, the wireless communication control is executed as in the conventional case.

  On the other hand, if it is determined that communication is not possible, communication impossible data indicating that communication is not possible due to insufficient bandwidth is transmitted to the other wireless terminal of the transmission source as in the conventional case.

  When the other wireless terminal of the transmission source receives the communication disabled data, the wireless terminal performs, for example, voice output based on the communication disabled data via an output unit such as a speaker (not shown). Thereby, the user of the other radio | wireless terminal of the transmission origin can grasp | ascertain that communication is impossible because of insufficient bandwidth.

  The control unit 11 of the call control device 10 is a unit that performs overall control of the call control device 10 as a so-called CPU. When the call request information is received, the call request information is first transferred to the change necessity determination unit 13.

  The change necessity determination unit 13 is a unit that determines whether or not it is necessary to change the codec method set in each wireless terminal. If the change instruction data is added to the received call request information, the codec method is determined. If it is not given, it is determined that no change is necessary. In this embodiment, since the transmission request information to which the change instruction data is attached is received, the change necessity determination unit 13 determines that the change is necessary.

  Here, first, description will be made until the change control of the codec method data for the other wireless terminals 40 and 50 is performed.

  When the change necessity determination unit 13 determines that the change is necessary, the control unit 11 transfers the transmission request information to the change control unit 15.

  The change control unit 15 is a unit that changes the codec method data. Upon receiving the transmission request information, the change control unit 15 refers to the method change correspondence table in the storage unit 12 based on the codec method data attached to the transmission request information. The encoded data with a small usable band to be changed is specified, and the specified codec method data is added to the transmission request information.

  That is, in this embodiment, G. Since the codec method data indicating 711 (= 64k) is assigned, the change control unit 15 refers to the method change correspondence table in the storage unit 12 based on the codec method data (G.711 (= 64k)). G. has a small bandwidth. 720 (= 8k) is specified, and the specified G. Codec method data indicating 729 (= 8k) is added to the transmission request information.

  When the change control unit 15 completes the change of the codec method data, the control unit 11 transfers the transmission request information provided with the codec method data to the device specifying unit 14.

  If the change necessity determination unit 13 determines that the codec system does not need to be changed, the control unit 11 transfers the received call request information to the device specifying unit 14.

  The device specifying unit 14 is a unit that specifies an access point device that manages a wireless terminal that is a call request destination so as to be communicable. Upon receiving the call request information, the device specifying unit 14 is based on the terminal identification data given to the call request information. Referring to the inter-terminal device correspondence list data in the storage unit 12, the corresponding device identification data is specified.

  In this embodiment, since the transmission request information to which the terminal identification data indicating the other wireless terminal 50 is added is received, the device identification data indicating the access point device 30 is specified.

  When the device identification unit 14 identifies the device identification data, the control unit 11 transfers the identified device identification data and the codec method data attached to the transmission request information to the communication control unit 16.

  The communication control unit 16 is a unit that controls communication between the wireless terminals. Upon receiving the device identification data and the codec method data, the communication control unit 16 receives an incoming request with the codec method data added to the access point device based on the device identification data. Send information.

  In the present embodiment, the communication control unit 16 transmits the incoming request information to which the codec method data (G.729) is added to the access point device 30.

  The control unit 31 of the access point device 30 is a unit that controls the access point device 30 as a so-called CPU. Upon receipt of incoming request information, the incoming request information is temporarily stored in a memory (not shown) and a new outgoing request is made. The incoming request information is transferred to the incoming side bandwidth acquisition unit 33 in order to acquire incoming side bandwidth data indicating the total bandwidth required for communication including the wireless terminal that performed the call.

  The incoming-side band acquisition unit 33 is a unit that acquires incoming-side band data, and holds the following incoming-side band amount calculation formula in a memory (not shown).

  Calling side bandwidth calculation formula = NT + ST (2)

  However, NT: Bandwidth data required for communication by a new wireless terminal, ST: Bandwidth data used.

  Upon receiving the incoming request information, the incoming side bandwidth acquisition unit 33 first refers to the system bandwidth correspondence table in the storage unit 32 based on the codec method data attached to the incoming request information, and obtains the corresponding bandwidth data. At the same time, the used band data is acquired from the storage unit 32. Then, the incoming side bandwidth acquisition unit 33 applies the specified bandwidth amount data and the acquired used bandwidth data to the above equation (2) to acquire the incoming side bandwidth data.

  The incoming side communication availability determination unit 34 is a unit that determines whether or not communication is possible according to the amount of bandwidth to be used. When the incoming side bandwidth acquisition unit 33 acquires the incoming side bandwidth data, first, the method change status data in the storage unit 32 is obtained. , Threshold data (= first incoming side threshold data or second incoming side threshold data) to be compared with the incoming side band data is determined. That is, when the method change status data indicates “not changed”, the comparison target of the incoming side band data is determined as the first incoming side threshold data, and when “in change” is indicated, the comparison target is determined as the second target. Determined as incoming side threshold data.

  In this embodiment, since the method change status data indicates “not changed”, the comparison target is determined as the first incoming side threshold data.

  When the receiving side communication enable / disable determining unit 34 determines the comparison target to be the first receiving side threshold data, the receiving side band data is started to be compared with the determined first receiving side threshold data, and the amount of bandwidth indicated by the receiving side band data is determined. If the bandwidth amount indicated by the first incoming side threshold data is smaller than the bandwidth amount indicated by the first incoming side threshold data, the communication is determined to be possible. Judge that it is possible.

  If the incoming side communication availability determination unit 34 determines that communication is possible, the incoming side data update unit 37 updates only the use band data as described above, and the incoming side communication availability determination unit 34 determines that communication is possible by changing the codec method. If it is determined, the use band data is updated as described above, and the method change status data in the storage unit 32 is updated from “not changed” to “being changed”.

  When the incoming side data update unit 37 updates only the used bandwidth data, the incoming side relay communication unit 35 transmits the incoming request information in the memory to another wireless terminal 50, and the incoming side data update unit 37 sends the method change status data. When updating to “being changed”, change instruction information including the codec method data added to the incoming call request information in the memory is transmitted to the call control device 10 in order to instruct the call control device 10 to change the codec method.

  When receiving the change instruction information, the control unit 11 of the call control device 10 transfers the change instruction information to the change control unit 15.

  When the change control unit 15 receives the change instruction information, the change control unit 15 refers to the method change correspondence table in the storage unit 12 based on the codec method data included in the change instruction information, and performs encoding with a small use band to be changed. In addition to specifying the data, the incoming request information to which the specified codec method data is assigned is transferred to the communication control unit 16, and the communication control unit 16 transmits the received incoming request information to the access point device 30, and the access point device When receiving the incoming request information, the control unit 31 of 30 transmits the received incoming request information to another wireless terminal 50.

  In this embodiment, since the incoming side data update unit 37 updates only the use band data, the incoming request information in the memory is transmitted to the other wireless terminals 50.

  Note that, for example, when a new incoming request is made to the access point device 30 from another wireless terminal (not shown) when the method change status data in the storage unit 32 is “during change”, the incoming side communication availability determination unit 34 determines the comparison target with the acquired incoming-side band data as the second incoming-side threshold data, and starts comparison between the incoming-side band data and the second incoming-side threshold data. If the bandwidth amount is smaller than the bandwidth amount indicated by the second incoming side threshold data, it is determined that communication is possible. If the bandwidth amount indicated by the incoming side bandwidth data is larger than the bandwidth amount indicated by the second incoming side threshold data, communication is impossible. Is determined.

  When the receiving side communication availability determination unit 34 determines that communication is possible, the receiving side data update unit 37 refers to the method bandwidth correspondence table in the storage unit 32 based on the codec method data attached to the incoming request information, The corresponding bandwidth data is specified, and the bandwidth indicated by the specified bandwidth data is added to the used bandwidth data to update only the used bandwidth data.

  When the incoming side data updating unit 37 updates the use band data, the incoming side relay communication unit 35 transmits the received incoming request information to another wireless terminal that is a destination. Thereafter, the wireless communication control is operated as in the conventional case.

  On the other hand, if it is determined that communication is not possible, communication impossible data indicating communication failure due to insufficient bandwidth is transmitted to the call control device 10 as in the conventional case.

  When the control unit 11 of the call control device 10 receives the communication disabled data, it transfers the received communication disabled data to the communication control unit 16, and the communication control unit 16 transmits the received communication disabled data to the access point device 20. .

  When the control unit 21 of the access point device 20 receives the communication disabled data, the control unit 21 transfers the received communication disabled data to the calling side relay communication unit 25, and the calling side relay communication unit 25 transmits the received communication disabled data to the source Send to other wireless terminals.

  When the other wireless terminal of the transmission source receives the communication disabled data, the wireless terminal performs, for example, voice output based on the communication disabled data via an output unit such as a speaker (not shown). Thereby, the user of the other radio | wireless terminal of the transmission origin can grasp | ascertain that communication is impossible because of insufficient bandwidth.

  The control unit 51 of the other wireless terminal 50 is a unit that controls the other wireless terminal 50 as a so-called CPU, and when receiving the incoming request information, the codec method data (G.729) added to the incoming request information. Is transferred to the receiving side system setting unit 55.

  The receiving-side method setting unit 55 is a unit that sets the codec method to be used in the codec unit 53. Upon receiving the codec method data (G.729), the called-side method setting unit 55 temporarily stores the codec method data in a memory (not shown) and A codec system based on the system data is set in the codec unit 53.

  When the receiving-side method setting unit 55 sets the codec method (G.729) in the codec unit 53, the control unit 51 transfers the codec method data in the memory to the receiving-side communication unit 54.

  Upon receiving codec method data (G.729), the incoming communication unit 54 performs data communication with an access point device capable of wireless communication. Send to.

  When receiving the incoming response information, the control unit 31 of the access point device 30 transfers the incoming response information to the incoming relay communication unit 35, and the incoming relay communication unit 35 sends the received incoming response information to the call control device 10. Send.

  When receiving the incoming response information, the control unit 11 of the call control device 10 transfers the incoming response information to the communication control unit 16, and the communication control unit 16 transmits the received incoming response information to the access point device 20.

  When receiving the incoming response information, the control unit 21 of the access point device 20 transmits the received incoming response information to another wireless terminal 40.

  When receiving the incoming response information, the control unit 41 of the other wireless terminal 40 transfers the codec method data (G.729) attached to the incoming response information to the outgoing side method setting unit 45.

  The transmission side method setting unit 45 is a unit that sets the codec method to be used in the codec unit 43. Upon receiving the codec method data (G.729), the transmission side method setting unit 45 selects the codec method (G.729) based on the codec method data. The codec unit 43 is set. Thereafter, the other wireless terminal 40 can perform wireless communication with the other wireless terminal 50 via the access point device 20 by the codec method (G.729) set in the codec unit 43.

  In this way, in the access point device 20, when the transmission side band data exceeds the first transmission side threshold data, the codec method data assigned to the transmission request information is converted into a codec system that uses less bandwidth than the codec method data. In the access point device 30, when the incoming-side bandwidth data exceeds the first incoming-side threshold data, the codec method data assigned to the incoming request information is used less than the codec method data. Since the codec system data is changed and the codec system indicated by the changed codec system data is set for the codec units 43 and 53 of the other wireless terminals 40 and 50, the other wireless terminals 40 and 40 are thereafter set. And other wireless terminals 50 set with less bandwidth Can perform wireless communication through the access point devices 20 and 30 by using the codec format (G.729) indicated Dekku system data.

  Next, a description will be given until the codec system change control is performed for the wireless terminal 60 currently performing wireless communication.

  When the control unit 11 of the call control device 10 finishes the connection control of the wireless terminals 40 and 50 as described above, the control unit 11 continues to change the codec method in use for all the wireless terminals 60 currently performing wireless communication. (G.711 to G.729) Each time the terminal identification data indicating each wireless terminal 60 currently in wireless communication is acquired by referring to the communication method management table of the storage unit 12 to indicate (G.711 to G.729), the acquired terminal identification Data is transferred to the device specifying unit 14.

  The device specifying unit 14 of the call control device 10 refers to the inter-terminal device correspondence list data in the storage unit 12 every time it receives the terminal identification data indicating the acquired wireless terminal 60 that is currently in wireless communication, and is currently in wireless communication. The device identification data corresponding to each wireless terminal 60 is specified.

  In this embodiment, device identification data indicating either the access point device 20 or the access point device 30 is specified for each wireless terminal 60.

  Each time the device specifying unit 14 specifies device identification data, the control unit 11 transfers the specified device identification data and a hold instruction signal instructing to hold the current wireless communication to the communication control unit 16.

  Upon receiving the device identification data and the hold instruction signal, the communication control unit 16 transmits a hold instruction signal to the access point device based on the device identification data. That is, in this embodiment, a hold instruction signal is transmitted to either the access point device 20 or the access point device 30.

  When the control units 21 and 31 of the access point device 20 and the access point device 30 receive the hold instruction signal, the hold instructions are given to the wireless terminals 60 via the caller-side relay communication unit 25 and the callee-side relay communication unit 35, respectively. Send a signal.

  The control unit 61 of each wireless terminal 60 is a unit that performs overall control of each wireless terminal 60 as a so-called CPU. When receiving a hold instruction signal from either the access point device 20 or the access point device 30, the control unit 61 outputs a hold instruction signal. Transfer to the hold control unit 65.

  The hold control unit 65 is a unit that controls the hold of the wireless communication. Upon receiving the hold instruction signal, the hold control unit 65 holds the wireless communication and gives codec method data indicating the codec method used (G.711). The hold response information is transmitted to either the access point device 20 or the access point device 30 that is the transmission source.

  Upon receiving the hold response information, the control units 21 and 31 of the access point device 20 and the access point device 30 respectively send the hold response information to the call control device 10 via the caller-side relay communication unit 25 and the callee-side relay communication unit 35. Send.

  The control unit 11 of the call control device 10 transmits the hold response information to the change control unit 15 every time the hold response information is received from each wireless terminal 60.

  Each time the change control unit 15 receives the hold response information, the change control unit 15 refers to the method change correspondence table of the storage unit 12 based on the assigned codec method data (G.711), and the use band to be changed is small. While specifying the encoded data (G.729), the reservation release instruction information to which the specified codec method data (G.729) is attached is generated.

  The control unit 11 transfers the generated hold release instruction information to the communication control unit 16 every time the change control unit 15 generates the hold release instruction information.

  That is, G. Since the codec method data indicating 711 (= 64k) is assigned, the change control unit 15 refers to the method change correspondence table in the storage unit 12 based on the codec method data (G.711 (= 64k)). G. has a small bandwidth. 720 (= 8k) is specified, and the specified G. The hold release instruction information to which the codec method data indicating 729 (= 8k) is added is generated.

  The control unit 11 transmits the hold release instruction information to the access point device every time the change control unit 15 generates the hold release instruction information. In other words, in this embodiment, the hold release instruction information is transmitted to either the access point device 20 or the access point device 30 that relayed the hold response information.

  When the control units 21 and 31 of the access point device 20 and the access point device 30 respectively receive hold release instruction information, the wireless terminal receives the hold release instruction information via the caller-side relay communication unit 25 and the callee-side relay communication unit 35. 60 is transmitted.

  When receiving the hold release instruction information, the control unit 61 of each wireless terminal 60 transfers the assigned codec method data (G.729) to the method setting unit 64.

  The system setting unit 64 is a unit that sets the codec system to be used in the codec unit 62. Upon receiving the codec system data (G.729), the system setting unit 64 sets the codec system based on the codec system data in the codec unit 62. .

  When the method setting unit 64 sets the codec method to the codec unit 62, the control unit 61 transfers a setting completion signal indicating that the setting is completed to the hold control unit 65, and the hold control unit 65 that has received the setting completion signal Release the hold of the wireless communication that is on hold. Thereafter, each wireless terminal 60 can continue wireless communication using a codec method (G.729) that uses less bandwidth than the codec method (G.711) that has been used.

  As described above, in the access point device 20, when the transmission side band data is larger than the first transmission side threshold data, the wireless communication of each wireless terminal 60 currently in wireless communication is suspended, and each wireless terminal 60 in suspension is suspended. Is changed to a codec method (G.729) with a smaller bandwidth, and after the change, the suspension of the pending wireless communication is canceled, and each wireless terminal 60 Since the wireless communication is continued using the codec system (G.729) after the change, the band used for the wireless communication by the access point device 20 can be reduced. Therefore, it is possible to accept a call request from another new wireless terminal.

  Next, as described above, the case where the codec schemes of the other radio terminal 40, the other radio terminal 50, and the radio terminal 60 that are performing radio communication using the changed codec scheme are canceled is described. .

  In the present embodiment, the codec method data indicating the codec method (G.729) used for the access point device 20 and the other wireless terminal 40 to disconnect communication with the other wireless terminal 50 and other When the disconnection request information to which the terminal identification data indicating the wireless terminal 50 is added is transmitted, the change of the codec method (G.729) in use is canceled and changed for the plurality of wireless terminals 60 in wireless communication The process until the previous codec system (G.711) is set will be described.

  For example, the control unit 21 of the access point device 20 disconnects the codec method data indicating the used codec method (G.729) and the terminal identification data indicating the other wireless terminal 50 from another wireless terminal 40. Upon receiving the request information, the disconnection request information is temporarily stored in a memory (not shown), and the disconnection is performed in order to obtain the transmission side reduced bandwidth data indicating the total bandwidth excluding the bandwidth used by the wireless terminal requested to be disconnected. The request information is transferred to the transmission side band obtaining unit 23.

  The transmission side band acquisition unit 23 holds the following transmission side reduction band amount calculation formula in a memory (not shown).

  Transmission side reduction band amount calculation formula = ST-BT (3)

  However, ST: used band data, BT: band amount data used by the wireless terminal to be disconnected.

  When receiving the disconnection request information, the transmission side bandwidth acquisition unit 23 first refers to the system bandwidth amount correspondence table of the storage unit 22 based on the codec method data assigned to the disconnection request information, and obtains the corresponding bandwidth amount data. At the same time, the use band data is acquired from the storage unit 22. And the transmission side band acquisition part 23 applies the specified band amount data and the acquired use band data to said Formula (3), and acquires transmission side reduction band data.

  The transmission side update availability determination unit 26 is a unit that determines whether the method change status data can be updated according to the amount of bandwidth to be used. When the transmission side bandwidth acquisition unit 23 acquires the transmission side reduction bandwidth data, the transmission side reduction bandwidth The data is compared with the second transmission-side threshold data in the storage unit 22, and when the bandwidth amount indicated by the transmission-side reduced bandwidth data is smaller than the bandwidth amount indicated by the second transmission-side threshold data, it is determined that the update is possible, and the transmission side When the bandwidth amount indicated by the reduced bandwidth data is larger than the bandwidth amount indicated by the second transmission side threshold data, it is determined that the update is impossible.

  In this embodiment, the transmission side update availability determination unit 26 determines that the update is possible because the bandwidth amount indicated by the transmission side reduced bandwidth data is smaller than the bandwidth amount indicated by the second transmission side threshold data.

  When the transmission side update availability determination unit 26 determines that the update is possible, the transmission side data update unit 27 updates the use band data in the storage unit 22 and changes the method change status data from “being changed” to “not changed”. Update.

  If the transmission side update availability determination unit 26 determines that update is not possible, the system bandwidth amount correspondence table in the storage unit 22 is referred to based on the codec method data (G.729) assigned to the memory disconnection request information. The corresponding band amount data is specified, and the band amount indicated by the specified band amount data is subtracted from the use band data to update only the use band data.

  When the transmission side data updating unit 27 updates the storage unit 22, the transmission side relay communication unit 25 transmits memory disconnection request information to the call control device 10.

  When receiving the disconnection request information, the control unit 11 of the call control device 10 transfers the disconnection request information to the device specifying unit 14.

  When receiving the disconnection request information, the device specifying unit 14 refers to the inter-terminal device correspondence list data in the storage unit 12 based on the assigned terminal identification data, and specifies the corresponding device identification data. That is, in this embodiment, device identification data indicating the access point device 30 is specified.

  When the device specifying unit 14 specifies device identification data, the control unit 11 transfers the specified device identification data and disconnection request information to the communication control unit 16.

  When receiving the device identification data and the disconnection request information, the communication control unit 16 transmits the disconnection request information to the access point device based on the device identification data. That is, disconnection request information is transmitted to the access point device 30.

  When receiving the disconnection request information, the control unit 31 of the access point device 30 temporarily stores the disconnection request information in a memory (not shown) and indicates the total bandwidth amount excluding the bandwidth amount used by the wireless terminal requested to disconnect. The disconnect request information is output to the incoming side bandwidth acquisition unit 33 in order to acquire incoming side reduction bandwidth data.

  The incoming side bandwidth acquisition unit 33 holds the following incoming side reduction bandwidth amount calculation formula in a memory (not shown).

  Called side reduced bandwidth amount calculation formula = ST-BT (4)

  However, ST: used band data, BT: band amount data used by the wireless terminal to be disconnected.

  Upon receiving the disconnection request information, the receiving side bandwidth acquisition unit 33 first refers to the system bandwidth amount correspondence table of the storage unit 32 based on the codec method data assigned to the disconnection request information, and obtains the corresponding bandwidth amount data. At the same time, the used band data is acquired from the storage unit 32. Then, the incoming side bandwidth acquisition unit 33 applies the specified bandwidth amount data and the acquired used bandwidth data to the above equation (4) to acquire incoming side reduction bandwidth data.

  The incoming side update availability determination unit 36 is a unit that determines whether the method change status data can be updated according to the amount of bandwidth to be used. When the incoming side bandwidth acquisition unit 33 acquires the incoming side reduced bandwidth data, first, the incoming side The reduced bandwidth data is compared with the second incoming side threshold data in the storage unit 32. If the bandwidth amount indicated by the incoming side reduced bandwidth data is smaller than the bandwidth amount indicated by the second incoming side threshold data, it is determined that the update is possible, If the bandwidth amount indicated by the incoming-side reduced bandwidth data is greater than the bandwidth amount indicated by the second incoming-side threshold data, it is determined that updating is impossible.

  In the present embodiment, the incoming side update availability determination unit 36 determines that the update is possible because the bandwidth amount indicated by the incoming side reduced bandwidth data is smaller than the bandwidth amount indicated by the second incoming side threshold data.

  When the incoming side update availability determination unit 36 determines that the update is possible, the incoming side data update unit 37 updates the use band data in the storage unit 32 and updates the method change status data from “being changed” to “not changed”. To do.

  The incoming side relay communication unit 35, when the incoming side data update unit 37 updates the use band data and the method change status data, transmits the memory disconnection request information to the other radio terminals 50, and each radio terminal in radio communication The change cancellation instruction information is transmitted to the call control apparatus 10 in order to change the codec system (G.729) after the change used by 60 to the codec system (G.711) before the change.

  When receiving the change release instruction information, the control unit 11 of the call control device 10 refers to the communication method management table of the storage unit 12 and acquires terminal identification data indicating each wireless terminal 60 currently performing wireless communication. The acquired terminal identification data is transferred to the device specifying unit 14.

  Each time the device specifying unit 14 receives the terminal identification data indicating the acquired wireless terminal 60 currently in wireless communication, the device specifying unit 14 refers to the inter-terminal device correspondence list data in the storage unit 12 and each wireless terminal 60 currently in wireless communication. The device identification data corresponding to is specified.

  In this embodiment, device identification data indicating either the access point device 20 or the access point device 30 is specified for each wireless terminal 60.

  Each time the device specifying unit 14 specifies device identification data, the control unit 11 transfers the specified device identification data and a hold instruction signal instructing to hold the current wireless communication to the communication control unit 16.

  Upon receiving the device identification data and the hold instruction signal, the communication control unit 16 transmits a hold instruction signal to the access point device based on the device identification data. That is, in this embodiment, a hold instruction signal is transmitted to either the access point device 20 or the access point device 30.

  When the control units 21 and 31 of the access point device 20 and the access point device 30 receive the hold instruction signal, respectively, the hold instruction signal is transmitted to each wireless terminal 60 via the caller-side relay communication unit 25 and the callee-side relay communication unit 35. On the other hand, a hold instruction signal is transmitted.

  When receiving a hold instruction signal from either the access point device 20 or the access point device 30, the control unit 61 of each wireless terminal 60 transfers the hold instruction signal to the hold control unit 65.

  When the hold control unit 65 receives the hold instruction signal, the hold control unit 65 holds the wireless communication and the hold point response information added with the codec method data indicating the codec method used is the source of the access point device 20 and the access point device. To any one of 30.

  When receiving the hold response information, the control units 21 and 31 of the access point device 20 and the access point device 30 respectively send the hold response information to the call control device 10 via the caller-side relay communication unit 25 and the callee-side relay communication unit 35. Send.

  The control unit 11 of the call control device 10 transmits the hold response information to the change control unit 15 every time the hold response information is received from each wireless terminal 60.

  Each time the change control unit 15 receives the hold response information, the change control unit 15 changes the codec method after change to the codec method before change, based on the assigned codec method data, the method change cancellation correspondence table of the storage unit 12 , The encoded data having a large use band to be changed is specified, and the hold release instruction information to which the specified codec method data is added is generated.

  The control unit 11 transfers the generated hold release instruction information to the communication control unit 16 every time the change control unit 15 generates the hold release instruction information.

  That is, G. Since the codec method data indicating 729 (= 8k) is added, the change control unit 15 performs the codec method data G. 729 (= 8k), the method change correspondence table of the storage unit 12 is referred to and the G. The codec method data indicating 711 (= 64k) is specified, and the specified G. The hold release instruction information to which codec method data indicating 711 (= 64k) is added is generated.

  The control unit 11 transmits the hold release instruction information to the access point device every time the change control unit 15 generates the hold release instruction information. In other words, in the present embodiment, the G.P. G. is transmitted to either the access point device 20 or the access point device 30 that relayed the hold response information. The hold release instruction information to which 711 (= 64k) is assigned is transmitted.

  When the control units 21 and 31 of the access point device 20 and the access point device 30 respectively receive hold release instruction information, the wireless terminal receives the hold release instruction information via the caller-side relay communication unit 25 and the callee-side relay communication unit 35. 60 is transmitted.

  When receiving the hold release instruction information, the control unit 61 of each wireless terminal 60 transfers the assigned codec method data to the method setting unit 64.

  The method setting unit 64 is a unit that sets the codec method to be used in the codec unit 62. When the codec method data is received, the method setting unit 64 sets the codec method based on the codec method data in the codec unit 62.

  When the method setting unit 64 sets the codec method to the codec unit 62, the control unit 61 transfers a setting completion signal indicating that the setting is completed to the hold control unit 65, and the hold control unit 65 that has received the setting completion signal Release the hold of the wireless communication that is on hold. Thereafter, each wireless terminal 60 can continue the wireless communication by the codec method before the change that uses a larger bandwidth than the codec method used.

  On the other hand, when receiving the disconnection request information, the control unit 51 of the other wireless terminal 50 detects the disconnection of the communication, transfers the disconnection response information indicating that the disconnection request information has been received, to the receiving side communication unit 54, and receives the incoming call. The side communication unit 54 transmits the received disconnection response information to the access point device 30.

  When receiving the disconnection response information, the control unit 31 of the access point device 30 transfers the disconnection response information to the incoming side relay communication unit 35, and the incoming side relay communication unit 35 sends the received disconnection response information to the call control device 10. Send.

  When receiving the disconnection response information, the control unit 11 of the call control device 10 transfers the disconnection response information to the communication control unit 16, and the communication control unit 16 transmits the received disconnection response information to the other wireless terminal 40. When the other wireless terminal 40 receives the disconnection response information, the disconnection of communication between the other wireless terminal 40 and the other wireless terminal 50 is completed.

  Note that the incoming side data update unit 37, when the incoming side update availability determination unit 36 determines that update is not possible, based on the codec system data attached to the memory disconnection request information, the system bandwidth correspondence table of the storage unit 32 , The corresponding band amount data is specified, and the band amount indicated by the specified band amount data is subtracted from the used band data to update only the used band data.

  The incoming side relay communication unit 35 transmits memory disconnection request information to another wireless terminal 50 when the incoming side data update unit 37 updates only the used band data.

  Similarly to the above, when receiving the disconnection request information, the control unit 51 of the other wireless terminal 50 detects the disconnection of the communication and transfers the disconnection response information indicating that the disconnection request information has been received to the receiving side communication unit 54. Then, the receiving side communication unit 54 transmits the received disconnection response information to the access point device 30, and when the control unit 31 of the access point device 30 receives the disconnection response information, the receiving side relay communication unit 35 transmits the disconnection response information. Then, the incoming side relay communication unit 35 transmits the accepted disconnection response information to the call control device 10.

  When receiving the disconnection response information, the control unit 11 of the call control device 10 transfers the disconnection response information to the communication control unit 16, and the communication control unit 16 transmits the received disconnection response information to the other wireless terminal 40. When the other wireless terminal 40 receives the disconnection response information, the disconnection of communication between the other wireless terminal 40 and the other wireless terminal 50 is completed.

  As described above, when the access-side band data is larger than the second transmission-side threshold data in the access point device 20 and the reception-side band data is larger than the second reception-side threshold data in the access point device 30, the wireless communication is currently being performed. The wireless communication of each wireless terminal 60 is suspended, the codec system used by each wireless terminal 60 being suspended is changed to the codec system before the change with a larger use band, and after the change, Since the wireless communication suspension is canceled and each wireless terminal 60 is allowed to continue the wireless communication using the codec system before the change, each wireless terminal 60 uses the access point device 20 with the voice quality before the codec system change. And 30 can continue wireless communication.

<Operation of Example>
Hereinafter, with respect to the access point device 20 that is wirelessly communicating with a plurality of wireless terminals 60, G. When the transmission request information to which the codec method data indicating the codec method 711 and the terminal identification data indicating the other wireless terminal 50 are added is transmitted, the codec method for the other wireless terminals 40 and 50 and each wireless terminal in wireless communication A description will be given until 60 codec schemes are changed.

  In this embodiment, a plurality of wireless terminals 60 are connected to G.C. It is assumed that wireless communication is being performed using the codec method 711 and the method change status data in the storage unit 22 of the access point device 20 indicates “not changed”. Further, it is assumed that the method change status data in the storage unit 32 of the access point device 30 also indicates “not changed”.

  FIG. 2 is a flowchart for changing the codec method for the other wireless terminals 40 and 50.

  The control unit 41 of the other wireless terminal 40 receives terminal identification data indicating the telephone number of the other wireless terminal 50 and the G.G. When codec method data indicating the codec method 711 is input and a call request is instructed, terminal identification data and codec method data are transferred to the caller communication unit 44.

  When receiving the terminal identification data and the codec method data, the transmission side communication unit 44 transmits the transmission request information with the terminal identification data and the codec method data to the access point device 20 (S1).

  When receiving the call request information, the control unit 21 of the access point device 20 temporarily stores the call request information in a memory (not shown) and determines the total bandwidth required for communication including the wireless terminal that newly made the call request. The transmission request information is transferred to the transmission side band acquisition unit 23 in order to acquire the transmission side band data shown.

  Upon receiving the transmission request information, the transmission side band acquisition unit 23 first refers to the method band amount correspondence table in the storage unit 22 based on the codec method data (G.711) given to the transmission request information, and In addition to specifying the bandwidth data to be used, the used bandwidth data is acquired from the storage unit 22. And the transmission side zone | band acquisition part 23 applies the specified band amount data and the acquired use band data to said Formula (1), and acquires transmission side zone | band data (S2).

  When the transmission side band acquisition unit 23 acquires the transmission side band data, the transmission side communication availability determination unit 24 first refers to the method change status data in the storage unit 22 and threshold data (= First transmission side threshold data or second transmission side threshold data) is determined. That is, when the method change status data indicates “not changed”, the band data comparison target is determined as the first transmission side threshold data, and when “change in progress” is indicated, the comparison target is determined as the second transmission side. The threshold data is determined (S3).

  In this embodiment, since the method change status data indicates “not changed”, the comparison target of the band data is determined as the first transmission side threshold data.

  When the transmission side communication feasibility determination unit 24 determines the comparison target to be the first transmission side threshold data, comparison between the transmission side band data and the determined first transmission side threshold data is started, and the bandwidth amount indicated by the transmission side band data is When the bandwidth amount indicated by the first transmission side threshold data is smaller than that indicated by the first transmission side threshold data, it is determined that communication is possible. It is determined that communication is possible by changing the codec method 729 (S7).

  When the transmission side communication availability determination unit 24 determines that communication is possible, the transmission side data update unit 27 refers to the method bandwidth correspondence table in the storage unit 22 based on the codec method data attached to the transmission request information in the memory. Then, the corresponding band amount data is specified, and the band amount indicated by the specified band amount data is added to the used band data to update only the used band data (S8).

  On the other hand, the caller side communication feasibility determination unit 24 determines that the G. When it is determined that communication is possible due to the change in the codec method of 729, the transmission side data update unit 27 updates the use band data in the storage unit 22 and updates the method change status data from “not changed” to “being changed”. (S10).

  When the transmission side data update unit 27 updates only the use band data, the transmission side relay communication unit 25 transmits the transmission request information in the memory to the call control device 10 (S9), and the transmission side data update unit 27 uses the use band data. When the method change status data is updated, the transmission request information with the change instruction data for instructing the change of the codec method is transmitted to the call control device 10 (S11). In this embodiment, transmission request information to which change instruction data is attached is transmitted to the call control device 10.

  For example, when a new transmission request is made to the access point device 20 from another wireless terminal (not shown) when the method change status data in the storage unit 32 is “being changed”, the transmission side communication availability determination unit 24 determines the comparison target with the acquired transmission side band data as the second transmission side threshold data, and starts comparison between the transmission side band data and the second transmission side threshold data, and indicates the transmission side band data. If the bandwidth amount is smaller than the bandwidth amount indicated by the second transmission side threshold data, it is determined that communication is possible. If the bandwidth amount indicated by the transmission side bandwidth data is larger than the bandwidth amount indicated by the second transmission side threshold data, communication is impossible. (S4).

  When the caller-side communication availability determination unit 24 determines that communication is possible, the caller-side data update unit 27 refers to the method bandwidth correspondence table in the storage unit 22 based on the codec method data assigned to the call request information, The corresponding bandwidth data is specified, and the bandwidth indicated by the specified bandwidth data is added to the used bandwidth data to update only the used bandwidth data (S5).

  When the transmission side data update unit 27 updates only the use band data, the transmission side relay communication unit 25 transmits the received transmission request information to the call control device 10 (S9). Thereafter, the same wireless communication control as before is executed.

  On the other hand, if it is determined that communication is not possible, communication impossible data indicating that communication is not possible due to insufficient bandwidth is transmitted to the other wireless terminal of the transmission source (S6).

  When the other wireless terminal of the transmission source receives the communication disabled data, the wireless terminal performs, for example, voice output based on the communication disabled data via an output unit such as a speaker (not shown). Thereby, the user of the other radio | wireless terminal of the transmission origin can grasp | ascertain that communication is impossible because of insufficient bandwidth.

  When receiving the call request information, the control unit 11 of the call control device 10 first transfers the call request information to the change necessity determination unit 13 (S12).

  The change necessity determination unit 13 determines that the codec method needs to be changed if the change instruction data is added to the received transmission request information, and determines that the change is not required if it is not added (S13). In this embodiment, since the transmission request information to which the change instruction data is attached is received, the change necessity determination unit 13 determines that the change is necessary.

  Here, first, description will be given until the change control of the codec method for the other wireless terminals 40 and 50 is performed.

  When the change necessity determination unit 13 determines that the change is necessary, the control unit 11 transfers the transmission request information to the change control unit 15 (S15).

  When the change control unit 15 receives the transmission request information, the change control unit 15 refers to the method change correspondence table of the storage unit 12 based on the codec method data attached to the transmission request information, and encodes with a small use band to be changed. The data is specified and the specified codec method data is added to the transmission request information (S16).

  That is, in this embodiment, G. Since the codec method data indicating 711 (= 64k) is assigned, the change control unit 15 refers to the method change correspondence table in the storage unit 12 based on the codec method data (G.711 (= 64k)). G. has a small bandwidth. 720 (= 8k) is specified, and the specified G. Codec method data indicating 729 (= 8k) is added to the transmission request information.

  When the change control unit 15 completes the change of the codec method data, the control unit 11 transfers the transmission request information provided with the codec method data to the device specifying unit 14 (S16).

  If the change necessity determination unit 13 determines that the codec system does not need to be changed, the control unit 11 transfers the received call request information to the device specifying unit 14 (S14).

  Upon receiving the call request information, the device specifying unit 14 refers to the inter-terminal device correspondence list data in the storage unit 12 based on the terminal identification data given to the call request information, and specifies the corresponding device identification data ( S17).

  In this embodiment, since the transmission request information to which the terminal identification data indicating the other wireless terminal 50 is added is received, the device identification data indicating the access point device 30 is specified.

  When the device identification unit 14 identifies the device identification data, the control unit 11 transfers the identified device identification data and the codec method data attached to the transmission request information to the communication control unit 16.

  Upon receiving the device identification data and the codec method data, the communication control unit 16 transmits the incoming request information with the codec method data to the access point device based on the device identification data (S18).

  In the present embodiment, the communication control unit 16 transmits the incoming request information to which the codec method data (G.729) is added to the access point device 30.

  When receiving the incoming request information, the control unit 31 of the access point device 30 temporarily stores the incoming request information in a memory (not shown) and determines the total bandwidth required for communication including the wireless terminal that newly made the outgoing request. The incoming request information is transferred to the incoming side bandwidth acquisition unit 33 in order to acquire the incoming side bandwidth data shown.

  Upon receiving the incoming request information, the incoming side bandwidth acquisition unit 33 first refers to the system bandwidth correspondence table in the storage unit 32 based on the codec method data attached to the incoming request information, and obtains the corresponding bandwidth data. At the same time, the used band data is acquired from the storage unit 32. Then, the incoming side bandwidth acquisition unit 33 applies the specified bandwidth data and the acquired used bandwidth data to the above equation (2) to acquire the incoming side bandwidth data (S19).

  When the incoming side bandwidth acquisition unit 33 acquires the incoming side bandwidth data, the incoming side communication availability determination unit 34 first refers to the method change status data in the storage unit 32 and threshold data (= First incoming side threshold data or second incoming side threshold data) is determined (S20). That is, when the method change status data indicates “not changed”, the comparison target of the incoming side band data is determined as the first incoming side threshold data, and when “in change” is indicated, the comparison target is determined as the second target. Determined as incoming side threshold data.

  In this embodiment, since the method change status data indicates “not changed”, the comparison target is determined as the first incoming side threshold data.

  When the receiving side communication enable / disable determining unit 34 determines the comparison target to be the first receiving side threshold data, the receiving side band data is started to be compared with the determined first receiving side threshold data, and the amount of bandwidth indicated by the receiving side band data is determined. If the bandwidth amount indicated by the first incoming side threshold data is smaller than the bandwidth amount indicated by the first incoming side threshold data, the communication is determined to be possible. It is determined that it is possible (S21).

  When the incoming side communication availability determination unit 34 determines that communication is possible, the incoming side data update unit 37 updates only the use band data as described above (S22).

  The incoming side relay communication unit 35 transmits the received incoming request information to another wireless terminal 50 when the incoming side data update unit 37 updates only the use band data (S29).

  If the incoming side communication enable / disable determining unit 34 determines that communication is possible by changing the codec method (G.729), the use band data is updated and the method change status data in the storage unit 32 is set to “unread” as described above. Update from “change” to “being changed” (S23).

  The incoming side relay communication unit 35, when the incoming side data update unit 37 updates the use band data and the system change status data in the storage unit 32, in order to instruct the call control device 10 to change the codec system, the incoming request information in the memory The change instruction information including the codec method data assigned to is transmitted to the call control device 10.

  When receiving the change instruction information, the control unit 11 of the call control device 10 transfers the change instruction information to the change control unit 15.

  When the change control unit 15 receives the change instruction information, the change control unit 15 refers to the method change correspondence table in the storage unit 12 based on the codec method data included in the change instruction information, and performs encoding with a small use band to be changed. In addition to specifying the data, the incoming call request information to which the specified codec method data is assigned is transferred to the communication control unit 16, and the communication control unit 16 transmits the received incoming call request information to the access point device 30 (S25). When receiving the incoming request information, the control unit 31 of the access point device 30 transmits the received incoming request information to another wireless terminal 50 (S29).

  In this embodiment, since the incoming side data update unit 37 updates only the used bandwidth data, the G. The incoming call request information to which the codec method data indicating the codec method 729 is added is transmitted to the other wireless terminal 50.

  Note that, for example, when a new incoming request is made to the access point device 30 from another wireless terminal (not shown) when the method change status data in the storage unit 32 is “during change”, the incoming side communication availability determination unit 34 determines the comparison target with the acquired incoming-side band data as the second incoming-side threshold data, and starts comparison between the incoming-side band data and the second incoming-side threshold data. If the bandwidth amount is smaller than the bandwidth amount indicated by the second incoming side threshold data, it is determined that communication is possible. If the bandwidth amount indicated by the incoming side bandwidth data is larger than the bandwidth amount indicated by the second incoming side threshold data, communication is impossible. (S26).

  When the receiving side communication availability determination unit 34 determines that communication is possible, the receiving side data update unit 37 refers to the method bandwidth correspondence table in the storage unit 32 based on the codec method data attached to the incoming request information, The corresponding bandwidth data is specified, and the bandwidth indicated by the specified bandwidth data is added to the used bandwidth data to update only the used bandwidth data (S27).

  When the incoming side data updating unit 37 updates the use band data, the incoming side relay communication unit 35 transmits the received incoming request information to another wireless terminal that is the destination (S29). Thereafter, the same wireless communication control as before is executed.

  On the other hand, if it is determined that communication is not possible, communication impossible data indicating communication failure due to insufficient bandwidth is transmitted to the call control device 10 as in the conventional case.

  When the control unit 11 of the call control device 10 receives the communication disabled data, it transfers the received communication disabled data to the communication control unit 16, and the communication control unit 16 transmits the received communication disabled data to the access point device 20. .

  When the control unit 21 of the access point device 20 receives the communication disabled data, the control unit 21 transfers the received communication disabled data to the calling side relay communication unit 25, and the calling side relay communication unit 25 transmits the received communication disabled data to the source Transmit to another wireless terminal (S28).

  When the other wireless terminal of the transmission source receives the communication disabled data, the wireless terminal performs, for example, voice output based on the communication disabled data via an output unit such as a speaker (not shown). Thereby, the user of the other radio | wireless terminal of the transmission origin can grasp | ascertain that communication is impossible because of insufficient bandwidth.

  When receiving the incoming request information, the control unit 51 of the other wireless terminal 50 transfers the codec method data (G.729) attached to the incoming request information to the incoming side method setting unit 55.

  Upon receiving the codec method data (G.729), the called-side method setting unit 55 temporarily stores the codec method data in a memory (not shown) and sets the codec method based on the codec method data in the codec unit 53 (S30). ).

  When the receiving-side method setting unit 55 sets the codec method (G.729) in the codec unit 53, the control unit 51 transfers the codec method data in the memory to the receiving-side communication unit 54.

  Upon receiving codec method data (G.729), the incoming communication unit 54 performs data communication with an access point device capable of wireless communication. (S31).

  When receiving the incoming response information, the control unit 31 of the access point device 30 transfers the incoming response information to the incoming relay communication unit 35, and the incoming relay communication unit 35 sends the received incoming response information to the call control device 10. Transmit (S32).

  When receiving the incoming response information, the control unit 11 of the call control device 10 transfers the incoming response information to the communication control unit 16, and the communication control unit 16 transmits the received incoming response information to the access point device 20 (S33). ).

  When receiving the incoming response information, the control unit 21 of the access point device 20 transmits the received incoming response information to another wireless terminal 40 (S34).

  When receiving the incoming response information, the control unit 41 of the other wireless terminal 40 transfers the codec method data (G.729) attached to the incoming response information to the outgoing side method setting unit 45.

  The transmission side method setting unit 45 is a unit that sets the codec method to be used in the codec unit 43. Upon receiving the codec method data (G.729), the transmission side method setting unit 45 selects the codec method (G.729) based on the codec method data. The codec unit 43 is set (S35). Thereafter, the other wireless terminal 40 can perform wireless communication with the other wireless terminal 50 via the access point device 20 by the codec method (G.729) set in the codec unit 43.

  As described above, in the access point device 20, when the transmission side band data is larger than the first transmission side threshold data, the codec method data assigned to the transmission request information is changed to a codec having a smaller use band than the codec method data. In the access point device 30, when the incoming-side bandwidth data is larger than the first incoming-side threshold data, the codec method data attached to the incoming request information is used more than the codec method data. Since the codec method data indicated by the changed codec method data is set for the codec units 43 and 53 of the other wireless terminals 40 and 50, the other wireless terminals 40 and 50 are set to the other codec method data. Bands used by the terminal 40 and other wireless terminals 50, respectively Codec system shown little codec format data can perform wireless communication through the access point devices 20 and 30 by using.

  Subsequently, description will be given until the change control of the codec system of the wireless terminal 60 currently performing wireless communication is performed.

  FIG. 3 is a flowchart of an operation for changing the codec method for the wireless terminal 60 during wireless communication.

  When the control unit 11 of the call control device 10 finishes the connection control of the wireless terminals 40 and 50 as described above, the control unit 11 continues to change the codec method in use for all the wireless terminals 60 currently performing wireless communication. (G.711 to G.729) Each time the terminal identification data indicating each wireless terminal 60 currently in wireless communication is acquired by referring to the communication method management table of the storage unit 12 to indicate (G.711 to G.729), the acquired terminal identification Data is transferred to the device specifying unit 14.

  The device specifying unit 14 of the call control device 10 refers to the inter-terminal device correspondence list data in the storage unit 12 every time it receives the terminal identification data indicating the acquired wireless terminal 60 that is currently wirelessly communicating, and is currently wirelessly communicating The device identification data corresponding to each wireless terminal 60 is specified (S1).

  In this embodiment, device identification data indicating either the access point device 20 or the access point device 30 is specified for each wireless terminal 60.

  Each time the device specifying unit 14 specifies device identification data, the control unit 11 transfers the specified device identification data and a hold instruction signal instructing to hold the current wireless communication to the communication control unit 16.

  Upon receiving the device identification data and the hold instruction signal, the communication control unit 16 transmits a hold instruction signal to the access point device based on the device identification data. That is, in this embodiment, a hold instruction signal is transmitted to either the access point device 20 or the access point device 30 (S2).

  When the control units 21 and 31 of the access point device 20 and the access point device 30 receive the hold instruction signal, the hold instructions are given to the wireless terminals 60 via the caller-side relay communication unit 25 and the callee-side relay communication unit 35, respectively. A signal is transmitted (S3).

  When receiving a hold instruction signal from either the access point device 20 or the access point device 30, the control unit 61 of each wireless terminal 60 transfers the hold instruction signal to the hold control unit 65.

  When the hold control unit 65 receives the hold instruction signal, the hold control unit 65 holds the wireless communication and the hold point response information added with the codec method data indicating the codec method used is the source of the access point device 20 and the access point device. It transmits to any one of 30 (S4).

  Upon receiving the hold response information, the control units 21 and 31 of the access point device 20 and the access point device 30 respectively send the hold response information to the call control device 10 via the caller-side relay communication unit 25 and the callee-side relay communication unit 35. Transmit (S5).

  The control unit 11 of the call control device 10 transmits the hold response information to the change control unit 15 every time the hold response information is received from each wireless terminal 60.

  Each time the change control unit 15 receives the hold response information, the change control unit 15 refers to the method change correspondence table of the storage unit 12 based on the assigned codec method data, and identifies the encoded data with a small use band to be changed. At the same time, the hold release instruction information to which the specified codec method data is attached is generated (S6).

  The control unit 11 transfers the generated hold release instruction information to the communication control unit 16 every time the change control unit 15 generates the hold release instruction information.

  That is, in this embodiment, G. Since the codec method data indicating 711 (= 64k) is assigned, the change control unit 15 refers to the method change correspondence table in the storage unit 12 based on the codec method data (G.711 (= 64k)). G. has a small bandwidth. 720 (= 8k) is specified, and the specified G. The hold release instruction information to which the codec method data indicating 729 (= 8k) is added is generated.

  The control unit 11 transmits the hold release instruction information to the access point device every time the change control unit 15 generates the hold release instruction information. In other words, in this embodiment, the hold release instruction information is transmitted to either the access point device 20 or the access point device 30 that relayed the hold response information (S7).

  When the control units 21 and 31 of the access point device 20 and the access point device 30 respectively receive hold release instruction information, the wireless terminal receives the hold release instruction information via the caller-side relay communication unit 25 and the callee-side relay communication unit 35. 60 is transmitted (S8).

  When receiving the hold release instruction information, the control unit 61 of each wireless terminal 60 transfers the assigned codec method data to the method setting unit 64.

  Upon receiving the codec method data, the method setting unit 64 sets the codec method based on the codec method data in the codec unit 62 (S9).

  When the method setting unit 64 sets the codec method to the codec unit 62, the control unit 61 transfers a setting completion signal indicating that the setting is completed to the hold control unit 65, and the hold control unit 65 that has received the setting completion signal Then, the pending wireless communication is released (S10). Thereafter, each wireless terminal 60 can continue wireless communication using a codec method (G.729) that uses less bandwidth than the codec method (G.711) that has been used.

  Thus, in the access point device 20, when the transmission side band data exceeds the first transmission side threshold data, the wireless communication of each wireless terminal 60 currently in wireless communication is suspended, and each wireless terminal 60 in suspension is Since the codec method being used is changed to a codec method with a smaller use band, and after the change, the hold of the pending wireless communication is released, each of the wireless terminals 60 thereafter uses the changed use band. By continuing the wireless communication using the codec system with a small number, the bandwidth used by the access point devices 20 and 30 for the wireless communication can be reduced. Therefore, it is possible to accept a call request from another new wireless terminal.

  Next, as described above, the case where the codec schemes of the other radio terminal 40, the other radio terminal 50, and the radio terminal 60 that are performing radio communication using the changed codec scheme are canceled is described. .

  In the present embodiment, the codec method data indicating the codec method (G.729) used for the access point device 20 and the other wireless terminal 40 to disconnect communication with the other wireless terminal 50 and other Change of the codec method (G.729) in use is canceled for the plurality of wireless terminals 60 in wireless communication when the disconnection request information with the terminal identification data indicating the wireless terminal 50 is transmitted, and before the change The process until the codec system (G.711) is set will be described.

  FIG. 4 is a flowchart of the change release operation of the wireless communication system according to the first embodiment.

  Disconnection request information to which the control unit 21 of the access point device 20 has added codec method data indicating the codec method used (G.729) and terminal identification data indicating another wireless terminal 50 from another wireless terminal 40. Is received (S1), the disconnection request information is temporarily stored in a memory (not shown), and in order to obtain the transmission side reduction band data indicating the total band amount excluding the band amount used by the wireless terminal requested to disconnect, The disconnection request information is transferred to the transmission side band acquisition unit 23.

  When receiving the disconnection request information, the transmission side bandwidth acquisition unit 23 first refers to the system bandwidth amount correspondence table of the storage unit 22 based on the codec method data assigned to the disconnection request information, and obtains the corresponding bandwidth amount data. At the same time, the use band data is acquired from the storage unit 22. And the transmission side zone | band acquisition part 23 applies the specified band amount data and the acquired use band data to said Formula (3), and acquires transmission side reduction | restoration zone | band data (S2).

  When the transmission side band acquisition unit 23 acquires the transmission side reduction band data, the transmission side update availability determination unit 26 compares the transmission side reduction band data with the second transmission side threshold value data of the storage unit 22 and transmits the transmission side reduction band. If the bandwidth amount indicated by the data is smaller than the bandwidth amount indicated by the second transmission side threshold data, it is determined that the update is possible, and the bandwidth amount indicated by the transmission side reduction bandwidth data is larger than the bandwidth amount indicated by the second transmission side threshold data. Then, it is determined that the update is impossible (S3).

  In this embodiment, the transmission side update availability determination unit 26 determines that the update is possible because the bandwidth amount indicated by the transmission side reduced bandwidth data is smaller than the bandwidth amount indicated by the second transmission side threshold data.

  When the transmission side update availability determination unit 26 determines that the update is possible, the transmission side data update unit 27 updates the use band data in the storage unit 22 and changes the method change status data from “being changed” to “not changed”. Update (S5).

  If the transmission side update availability determination unit 26 determines that update is not possible, the system bandwidth amount correspondence table of the storage unit 22 is referred to based on the codec method data (G.729) given to the memory disconnection request information. The corresponding band amount data is specified, and the band amount indicated by the specified band amount data is subtracted from the used band data to update only the used band data (S4).

  When the caller-side data update unit 27 updates the storage unit 22, the caller-side relay communication unit 25 transmits memory disconnection request information to the call control device 10 (S6).

  When receiving the disconnection request information, the control unit 11 of the call control device 10 transfers the disconnection request information to the device specifying unit 14.

  Upon receiving the disconnection request information, the device specifying unit 14 refers to the inter-terminal device correspondence list data in the storage unit 12 based on the assigned terminal identification data, and specifies the corresponding device identification data (S7). That is, in this embodiment, device identification data indicating the access point device 30 is specified.

  When the device specifying unit 14 specifies device identification data, the control unit 11 transfers the specified device identification data and disconnection request information to the communication control unit 16.

  Upon receiving the device identification data and the disconnection request information, the communication control unit 16 transmits the disconnection request information to the access point device based on the device identification data (S8). That is, disconnection request information is transmitted to the access point device 30.

  When receiving the disconnection request information (S9), the control unit 31 of the access point device 30 temporarily stores the disconnection request information in a memory (not shown) and removes all bandwidths excluding the bandwidth used by the wireless terminal requested to disconnect. In order to acquire the incoming side reduction band data indicating the amount, the disconnection request information is output to the incoming side band acquisition unit 33.

  Upon receiving the disconnection request information, the receiving side bandwidth acquisition unit 33 first refers to the system bandwidth amount correspondence table of the storage unit 32 based on the codec method data assigned to the disconnection request information, and obtains the corresponding bandwidth amount data. At the same time, the used band data is acquired from the storage unit 32. Then, the incoming side bandwidth acquisition unit 33 applies the specified bandwidth data and the acquired used bandwidth data to the above equation (4) to acquire incoming side reduction bandwidth data (S10).

  When the incoming side bandwidth acquisition unit 33 acquires the incoming side reduced bandwidth data, the incoming side update availability determination unit 36 first compares the incoming side reduced bandwidth data with the second incoming side threshold value data in the storage unit 32 to obtain the incoming side. If the bandwidth amount indicated by the reduced bandwidth data is smaller than the bandwidth amount indicated by the second incoming side threshold data, it is determined that the update is possible, and the bandwidth amount indicated by the incoming side reduced bandwidth data is greater than the bandwidth amount indicated by the second incoming side threshold data. Is larger, it is determined that the update is impossible (S11).

  In the present embodiment, the incoming side update availability determination unit 36 determines that the update is possible because the bandwidth amount indicated by the incoming side reduced bandwidth data is smaller than the bandwidth amount indicated by the second incoming side threshold data.

  When the incoming side update availability determination unit 36 determines that the update is possible, the incoming side data update unit 37 updates the use band data in the storage unit 32 and updates the method change status data from “being changed” to “not changed”. (S13).

  The incoming side relay communication unit 35, when the incoming side data update unit 37 updates the use band data and the method change status data, transmits the memory disconnection request information to the other wireless terminals 50, and each wireless terminal in wireless communication The change cancellation instruction information is transmitted to the call control apparatus 10 in order to change the codec system after change (G.729) used by 60 to the codec system (G.711) before change (S15).

  When receiving the change release instruction information, the control unit 11 of the call control device 10 refers to the communication method management table of the storage unit 12 and acquires terminal identification data indicating each wireless terminal 60 currently performing wireless communication. The acquired terminal identification data is transferred to the device specifying unit 14.

  Each time the device specifying unit 14 receives the terminal identification data indicating the acquired wireless terminal 60 currently in wireless communication, the device specifying unit 14 refers to the inter-terminal device correspondence list data in the storage unit 12 and each wireless terminal 60 currently in wireless communication. The device identification data corresponding to is specified (S19).

  In this embodiment, device identification data indicating either the access point device 20 or the access point device 30 is specified for each wireless terminal 60.

  Each time the device specifying unit 14 specifies device identification data, the control unit 11 transfers the specified device identification data and a hold instruction signal instructing to hold the current wireless communication to the communication control unit 16.

  Upon receiving the device identification data and the hold instruction signal, the communication control unit 16 transmits a hold instruction signal to the access point device based on the device identification data (S20). That is, in this embodiment, a hold instruction signal is transmitted to either the access point device 20 or the access point device 30.

  When the control units 21 and 31 of the access point device 20 and the access point device 30 receive the hold instruction signal, respectively, the hold instruction signal is transmitted to each wireless terminal 60 via the caller-side relay communication unit 25 and the callee-side relay communication unit 35. On the other hand, a hold instruction signal is transmitted (S21).

  When receiving a hold instruction signal from either the access point device 20 or the access point device 30, the control unit 61 of each wireless terminal 60 transfers the hold instruction signal to the hold control unit 65.

  When the hold control unit 65 receives the hold instruction signal, the hold control unit 65 holds the wireless communication and the hold point response information added with the codec method data indicating the codec method used is the source of the access point device 20 and the access point device. It transmits to any of 30 (S22).

  Upon receiving the hold response information, the control units 21 and 31 of the access point device 20 and the access point device 30 respectively send the hold response information to the call control device 10 via the caller-side relay communication unit 25 and the callee-side relay communication unit 35. Transmit (S23).

  The control unit 11 of the call control device 10 transmits the hold response information to the change control unit 15 every time the hold response information is received from each wireless terminal 60.

  Each time the change control unit 15 receives the hold response information, the change control unit 15 changes the codec method after change to the codec method before change, based on the assigned codec method data, the method change cancellation correspondence table of the storage unit 12 , The encoded data having a large use band to be changed is specified, and the hold release instruction information to which the specified codec method data is added is generated (S24).

  The control unit 11 transfers the generated hold release instruction information to the communication control unit 16 every time the change control unit 15 generates the hold release instruction information.

  That is, G. Since the codec method data indicating 729 (= 8k) is added, the change control unit 15 performs the codec method data G. 729 (= 8k), the method change correspondence table of the storage unit 12 is referred to and the G. The codec method data indicating 711 (= 64k) is specified, and the specified G. The hold release instruction information to which codec method data indicating 711 (= 64k) is added is generated.

  The control unit 11 transmits the hold release instruction information to the access point device every time the change control unit 15 generates the hold release instruction information. In other words, in the present embodiment, the G.P. G. is transmitted to either the access point device 20 or the access point device 30 that relayed the hold response information. The hold release instruction information to which 711 (= 64k) is assigned is transmitted (S25).

  When the control units 21 and 31 of the access point device 20 and the access point device 30 respectively receive hold release instruction information, the wireless terminal receives the hold release instruction information via the caller-side relay communication unit 25 and the callee-side relay communication unit 35. 60 is transmitted (S26).

  When receiving the hold release instruction information, the control unit 61 of each wireless terminal 60 transfers the assigned codec method data to the method setting unit 64.

  The system setting unit 64 is a unit that sets the codec system to be used in the codec unit 62. Upon receiving the codec system data, the system setting unit 64 sets the codec system based on the codec system data in the codec unit 62 (S27).

  When the method setting unit 64 sets the codec method to the codec unit 62, the control unit 61 transfers a setting completion signal indicating that the setting is completed to the hold control unit 65, and the hold control unit 65 that has received the setting completion signal Then, the pending wireless communication is released (S28). Thereafter, each wireless terminal 60 can continue the wireless communication by the codec method before the change that uses a larger bandwidth than the codec method used.

  On the other hand, when receiving the disconnection request information, the control unit 51 of the other wireless terminal 50 detects the disconnection of the communication, transfers the disconnection response information indicating that the disconnection request information has been received, to the receiving side communication unit 54, and receives the incoming call. The side communication unit 54 transmits the received disconnection response information to the access point device 30 (S16).

  When receiving the disconnection response information, the control unit 31 of the access point device 30 transfers the disconnection response information to the incoming side relay communication unit 35, and the incoming side relay communication unit 35 sends the received disconnection response information to the call control device 10. Transmit (S17).

  When receiving the disconnection response information, the control unit 11 of the call control device 10 transfers the disconnection response information to the communication control unit 16, and the communication control unit 16 transmits the received disconnection response information to the other wireless terminal 40 ( S18) When the other wireless terminal 40 receives the disconnection response information, the disconnection of communication between the other wireless terminal 40 and the other wireless terminal 50 is completed.

  Note that the incoming side data update unit 37, when the incoming side update availability determination unit 36 determines that update is not possible, based on the codec system data attached to the memory disconnection request information, the system bandwidth correspondence table of the storage unit 32 , The corresponding bandwidth data is identified, and the bandwidth amount indicated by the identified bandwidth data is subtracted from the bandwidth data used to update only the bandwidth data used (S12).

  The incoming side relay communication unit 35, when the incoming side data update unit 37 updates only the use band data, transmits the memory disconnection request information to the other wireless terminal 50 (S14).

  Similarly to the above, when receiving the disconnection request information, the control unit 51 of the other wireless terminal 50 detects the disconnection of the communication and transfers the disconnection response information indicating that the disconnection request information has been received to the receiving side communication unit 54. Then, the receiving side communication unit 54 transmits the received disconnection response information to the access point device 30, and when the control unit 31 of the access point device 30 receives the disconnection response information, the receiving side relay communication unit 35 transmits the disconnection response information. The incoming call relay communication unit 35 transmits the accepted disconnection response information to the call control device 10 (S17).

  When receiving the disconnection response information, the control unit 11 of the call control device 10 transfers the disconnection response information to the communication control unit 16, and the communication control unit 16 transmits the received disconnection response information to the other wireless terminal 40. When the other wireless terminal 40 receives the disconnection response information, the disconnection of communication between the other wireless terminal 40 and the other wireless terminal 50 is completed (S18).

  As described above, when the access-side band data is larger than the second transmission-side threshold data in the access point device 20 and the reception-side band data is larger than the second reception-side threshold data in the access point device 30, the wireless communication is currently being performed. The wireless communication of each wireless terminal 60 is suspended, the codec system used by each wireless terminal 60 being suspended is changed to the codec system before the change with a larger use band, and after the change, Since the wireless communication suspension is canceled and each wireless terminal 60 is allowed to continue the wireless communication using the codec system before the change, each wireless terminal 60 uses the access point device 20 with the voice quality before the codec system change. And 30 can continue wireless communication.

<Effect of Example>
In the wireless communication system of the present embodiment, the other wireless terminal 40 transmits the transmission request information to which the codec method data is added to the access point device 20, and the other wireless terminal 40 in the access point device 20 that has received the transmission request information. When the transmission side band data indicating the amount of bandwidth necessary for communication including the number exceeds the first transmission side threshold data indicating the band amount as a threshold for determining whether or not to change the codec method of each wireless terminal The codec method data assigned to the call request information is changed to codec method data having a smaller bandwidth than the codec method data, and the access point device 30 that has received the call request information receives another wireless terminal 40. Should the receiver side band data indicating the amount of bandwidth required for the communication included include change the codec method of each wireless terminal? If the first incoming side threshold data indicating the amount of bandwidth serving as a threshold for determining whether or not the codec method data attached to the incoming request information is changed to codec method data having a smaller bandwidth than the codec method data. Since the codec method indicated by the changed codec method data is set for the codec units 43 and 53 of the other wireless terminals 40 and 50, the other wireless terminal 40 and the other wireless terminal 50 By using the set codec method, when the call request is made, the requested access point devices 20 and 30 are in wireless communication with an allowable number of wireless terminals 60 determined according to the bandwidth amount. In addition, wireless communication via the access point devices 20 and 30 can be performed.

  Further, in the access point device 20, when the transmission side band data exceeds the first transmission side threshold data, the wireless communication of each wireless terminal 60 currently in wireless communication is suspended and used by each wireless terminal 60 in suspension. The codec method used is changed to a codec method with a smaller bandwidth, and after the change, the pending wireless communication is released, so that each wireless terminal 60 uses the changed codec method. By continuing the wireless communication, the bandwidth used by the access point devices 20 and 30 for the wireless communication can be reduced. Therefore, it is possible to provide a highly convenient wireless communication system that can accept a call request from another new wireless terminal.

  In the above-described embodiment, G. 711 (= 64k) to G. 729 (= 8k) has been described, but the present invention is not limited to this. If the configuration is changed to a codec method that uses a smaller communication band than the codec method indicated by the input codec method data, For example, G. 723.1 (= 6.3k), G.M. 726 (= 24k), G.E. It may be changed to any codec system such as 726 (= 14k).

  In the above embodiment, when the access point device 20 receives a call origination request from another wireless terminal 40, the codec method of the wireless terminal during wireless communication is changed. However, the present invention is not limited to this. The access point device 20 may be configured to cause the transmission side communication availability determination unit to perform determination based on the transmission side band data and the first transmission side threshold data at a predetermined timing, and to change the codec method according to the determination result.

  In the above embodiment, when the access point device 20 receives the disconnection request information, the configuration is such that the change of the codec scheme of the wireless terminal in wireless communication is canceled, but the present invention is not limited to this, and the access point device 20 However, it may be configured such that at a predetermined timing, the transmission side communication feasibility determination unit performs the determination based on the transmission side band data and the first transmission side threshold data, and the change of the codec method is canceled according to the determination result.

The block block diagram which shows the radio | wireless communications system of this invention Codec system change operation flowchart for other wireless terminals 40 and 50 Codec system change operation flowchart for the wireless terminal 60 during wireless communication Change cancellation operation flowchart of the wireless communication system of the first embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Call control apparatus 11 Control part 12 Storage part 13 Change necessity determination part 14 Device specification part 15 Change control part 16 Communication control part 20 Access point apparatus 21 Control part 22 Storage part 23 Origination side band acquisition part 24 Origination side communication availability judgment Unit 25 Originating side relay communication unit 26 Originating side update availability determination unit 27 Originating side data update unit 30 Access point device 31 Control unit 32 Storage unit 33 Incoming side bandwidth acquisition unit 34 Incoming side communication availability judgment unit 35 Incoming side relay communication unit 36 Receiving-side update availability determination unit 37 Receiving-side data update unit 40 Other wireless terminal 41 Control unit 42 Storage unit 43 Codec unit 44 Transmission-side communication unit 45 Transmission-side method setting unit 50 Other wireless terminal 51 Control unit 52 Storage unit 53 Codec 54 Receiving-side communication unit 55 Receiving-side system setting unit 60 Wireless terminal 61 Control unit 62 Codec unit 63 Communication unit 64 Method setting unit 65 Holding control unit 80 Network

Claims (2)

In a wireless communication system including an access point device that relays communication between a wireless terminal on a transmission side and a reception side that uses a set codec method, and a call control device that controls the communication,
The access point device is
A storage unit that holds first threshold data indicating a bandwidth amount serving as a reference for determining whether or not the set codec method needs to be changed;
Upon receiving the transmission request information to which the codec method data indicating the codec method designated by another wireless terminal is received, based on the designated codec method and the set codec method, the transmitting-side wireless terminal and the A caller-side band acquisition unit that acquires caller-side band data indicating the total bandwidth required for wireless communication of other wireless terminals; and
A communication enable / disable determining unit that determines that communication is possible by changing the set codec method when the originating side band data is greater than the first threshold data;
A relay communication unit for transmitting the call request information to the call control device, further adding change instruction data for instructing a change of the set codec method when the communication enable / disable determining unit determines that communication is possible;
The call control device includes:
When receiving the call request information to which the change instruction data is attached, each of the wireless terminals on the transmitting side and the receiving side transmits a hold instruction signal instructing to hold the communication, and receives each of the hold instruction signals. A control unit that, when receiving hold response information from a wireless terminal, transmits hold release instruction information to which codec method data indicating a codec method that uses less bandwidth than the set codec method is attached to each wireless terminal. A wireless communication system. In a wireless communication method of a wireless communication system, comprising: an access point device that relays communication between a wireless terminal on a transmission side and a reception side that uses a set codec method; and a call control device that controls the communication.
The access point device is
A storage step of holding first threshold value data indicating a bandwidth amount serving as a reference for determining whether or not the set codec method needs to be changed;
Upon receiving the transmission request information to which the codec method data indicating the codec method designated by another wireless terminal is received, based on the designated codec method and the set codec method, the transmitting-side wireless terminal and the A sender side bandwidth acquisition step for acquiring sender side bandwidth data indicating the total bandwidth required for wireless communication of other wireless terminals;
A communication availability determination step of determining that communication is possible by changing the set codec method when the originating side bandwidth data is larger than the first threshold data;
When the communication availability determination unit determines that communication is possible, the relay communication step of transmitting to the call control device the call request information further provided with change instruction data for instructing the change of the set codec method,
The call control device includes:
When receiving the call request information to which the change instruction data is attached, each of the wireless terminals on the transmitting side and the receiving side transmits a hold instruction signal instructing to hold the communication, and receives each of the hold instruction signals. A control step of transmitting, to each wireless terminal, hold release instruction information to which codec method data indicating a codec method that uses less bandwidth than the set codec method is received when the hold response information is received from the wireless terminal. A wireless communication method for a wireless communication system.

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