JP2001268005A - Wireless communication system in airport, wireless communication controller in airport, group controller and integrated management unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless communication system in an airport that can effectively utilize all frequency bands and conduct inter-group communication. SOLUTION: When a wireless terminal 1 makes a connection request to another wireless terminal 1, a transmission/reception controller 2 in charge of a group to which the wireless terminal 1 of the request source belongs receives this request and discriminates whether or not the setting of a communication link on request is possible on the basis of various sets of management information. When the setting of a communication link on request is possible, the transmission reception controller 2 selects an optional idle communication channel and assigns it respectively to the wireless terminal 1 of the request source and the wireless terminal 1 of the connection destination to set the communication link between both terminals via the communication channel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of wireless terminal devices belonging to one of a plurality of groups which are divided into predetermined operations related to airport operation and communicate with other predetermined wireless terminal devices. The present invention relates to an in-airport wireless communication system, an in-airport wireless communication control device, a group control device, and an integrated management device.

[0002]

2. Description of the Related Art In an airport, wireless communication is used for various tasks including a call between a pilot and a controller.

Conventionally, in such airport radio communication, each terminal is divided into groups according to business contents, and each group uses a different frequency band. For this reason, the frequency band that can be used in one group is limited to a part of all the frequency bands that can be used in the airport. In addition, there is a possibility that a group with low utilization of the allocated frequency may occur, and it is difficult to use limited frequency resources efficiently. Also, communication cannot be performed between terminals belonging to different groups, which may hinder efficient execution of business.

[0004]

As described above, in a conventional airport, since individual radio communication systems are used for each business, communication between workers engaged in different business cannot be performed. There was a defect.

The present invention has been made in view of such circumstances, and an object of the present invention is to make efficient use of the entire frequency band and to conveniently carry out communication between groups in an airport. It is an object of the present invention to provide a wireless communication system and an in-airport wireless communication control device, a group control device, and an integrated management device for realizing such a system.

[0006]

To achieve the above object, a first aspect of the present invention is to provide a plurality of radio stations belonging to any of a plurality of groups which are set by classifying predetermined tasks related to airport operation. In an airport wireless communication system having a terminal device and enabling these wireless terminal devices to communicate with another predetermined terminal device, at least one of a request source terminal and a connection destination terminal is connected to the wireless terminal device. Communication link setting means for setting a communication link between the request source terminal and the connection destination terminal in response to the connection request being made, for example, a communication link setting means including a transmission / reception control device and a frequency integrated management device; Possible communication channel usage states, and at least one of the groups to which the wireless terminal device as the requesting terminal and the connection destination terminal belong Limiting the setting of the communication link by the communication link setting means on the basis of the set conditions, for example, and a limiting means consisting of the transmission and reception control unit and the frequency integrated management apparatus.

[0007] By adopting such means, even if the wireless terminal devices belong to different groups, they are connected by communication links set under certain conditions. The above conditions are set, for example, according to the circumstances of each airport business to which each group corresponds, and the communication link is set in consideration of such circumstances.

According to a second aspect of the present invention, in the first aspect, the limiting means includes a use state of a communication channel usable in a system, and a wireless terminal device as the request source terminal and the connection destination terminal. In addition to the conditions set for at least one of the groups, the setting of the communication link by the communication link setting means is restricted based on the communication content requested by the requesting terminal.

[0009] By taking such measures, communication links are set in consideration of the importance of communication contents and the like.

[0010] In a third aspect of the present invention, the limiting means according to the first aspect of the present invention further comprises the step of setting the communication channel having the minimum number of use channels set for each of the groups to a communication link for a wireless terminal device belonging to each group. The communication channel is secured so that it can be used at all times for formation, and the setting of the communication link by the communication link setting means is allowed only when there is another remaining communication channel.

By taking such measures, communication links are set such that a predetermined number of communication channels can always be assigned to each group.

[0012] In a fourth aspect based on the first aspect, the limiting means is further configured to form a communication link relating to a wireless terminal device belonging to each group by a communication channel having a maximum number of use channels set for each of the groups. For this reason, the setting of the communication link by the communication link setting means is permitted only for the wireless terminal devices belonging to the group not used.

[0013] By taking such measures, the number of communication channels used in each group is limited.

According to a fifth aspect of the present invention, in the first aspect, the limiting means is set to the request source terminal when the terminal device in communication is set as a connection destination terminal and a communication link setting is requested. If the predetermined priority is higher than the predetermined priority set in the terminal device communicating with the connection destination terminal, after eliminating the communication link already set for the request connection destination, The communication link is set by the communication link setting means in response to the request.

[0015] By adopting such means, even when the connection destination terminal is communicating, communication with a high priority is interrupted.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the limiting means is provided in accordance with at least one of the terminal devices which are already communicating when there is no communication channel usable for setting a communication link. After eliminating a communication link used in communication whose predetermined priority determined is lower than a predetermined priority determined according to at least one of the requesting terminal and the connection destination terminal, The corresponding communication link is set by the communication link setting means.

By taking such measures, even when all communication channels are in use, by ending low-priority communication, an empty channel is secured and higher-priority communication is performed. Is interrupted.

According to a seventh aspect of the present invention, in addition to the fifth aspect or the sixth aspect, prior to canceling a communication link which has been set, a terminal device which performs communication using the communication link is provided. For example, a disconnection notification unit such as a transmission / reception control device for notifying the user that the communication link is to be canceled is provided.

[0019] By taking such means, it is notified in advance to the terminal device communicating with the communication link that the communication link will be canceled.

According to an eighth aspect of the present invention, the restriction means according to the seventh aspect of the present invention is provided from a terminal device communicating with the communication link for which the disconnection permission is canceled after the notification by the disconnection notifying means. In response, the communication link is canceled.

By taking such a measure, the communication link is canceled according to the intention of the disconnected side.

In a ninth aspect, the communication link setting means according to the first aspect is provided for each of the groups,
Intra-group link setting means such as a transmission / reception control device for setting a communication link between wireless terminal devices belonging to the group, a certain wireless terminal device and another terminal device not belonging to the group to which the wireless terminal device belongs , And an out-of-group link setting unit such as a frequency integrated management device that is set via an in-group link setting unit of a group to which the wireless terminal device connected to the communication link belongs.

By adopting such means, the setting of the communication link within the group and the setting of the communication link between the multiple groups are processed separately.

The tenth invention, in addition to the first invention, further comprises a voice recognition means such as a transmission / reception control device for recognizing a predetermined voice command to identify the content of a communication link setting request, and The communication link setting means and the restriction means perform setting of a communication link and restriction of the communication link setting based on the identification result by the voice recognition means.

By taking such means, a request for setting a communication link is accepted by a voice command.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a main part of an airport wireless communication system according to the present embodiment.

As shown in this figure, in the airport radio communication system of this embodiment, the number of radio terminal devices 1 and the number of transmission / reception controls equal to the number of groups set in the system (10 groups in this embodiment). It has a device 2 (2-1 to 2-10) and a frequency integrated management device 3.

The radio terminal 1 uses a number of communication channels set by frequency division and time division within a frequency band usable in this system, and uses the other radio terminals 1
And a function of performing wireless communication with the transmission / reception control device 2. These wireless terminal devices 1 are used by workers engaged in various tasks related to airports. Each of the wireless terminal devices 1 is associated in advance with a group corresponding to a task that the user is involved in.

The setting of the group can be arbitrarily set according to the circumstances at the airport to which the in-airport wireless communication system is applied. In this embodiment, however, "tower control", "airport maintenance", "aircraft company" , "Fire department", "Airport maintenance", "Airport security", "Aircraft maintenance", "Cargo terminal", "First addition" and "Second addition". And, for example, the wireless terminal device 1 belonging to the tower control group
The wireless terminal device 1 belonging to the airport maintenance group is used for airport operations corresponding to each group.

The transmission / reception control devices 2 correspond to the groups set as described above. Then, the transmission / reception control device 2 transmits the wireless terminal device 1 belonging to the corresponding group.
, A predetermined management process including the management of the state and the setting process of the communication link is performed. In the present embodiment, the transmission / reception control devices 2-3 to 2-8 correspond to a group in which communication is performed with other groups in the communication area CA1, and the transmission / reception control device 2-9 and the transmission / reception control device 2- 10 respectively
It corresponds to a group that performs communication independently in the communication areas CA2 and CA3. The transmission / reception control device 2 has a function of identifying a voice command sent from the wireless terminal device 1 by using a well-known voice recognition technology.

More specifically, for example, the communication area CA1 corresponds to the main part of the airport such as a runway, a control tower and a passenger terminal, and the communication areas CA2 and CA3 are separated from the main part of the airport such as an aircraft maintenance station and a cargo terminal. Equivalent to a place.

All the transmission / reception control devices 2 are connected to the integrated frequency management device 3 via, for example, a wired communication line. Then, the frequency integrated management device 3 performs a predetermined management process including a process of setting a communication link between the wireless terminal devices 1 belonging to different groups and a management of a setting status of the communication link.

Next, the operation of the airport radio communication system configured as described above will be described.

First, each transmission / reception control device 2 manages a communication link set for a wireless terminal device 1 belonging to a group to which the device belongs, in accordance with intra-group channel use management information as shown in FIG.

Each information included in the intra-group channel use management information shown in FIG. 2 is as described below.

(1) Management number A number for identifying a data record. “001” to “100” are prepared in advance, and up to 100 data records can be registered. The data record is composed of a set of management information on the set communication link. That is, up to 100 communication links involving the wireless terminal devices 1 in the group can be managed simultaneously.

(2) Frequency Number The identification number of the currently used frequency is registered. In the present embodiment, the usable frequency band is divided into 500 divided frequency bands, and frequency numbers from “F001” to “F500” are set in these divided frequency bands.

(3) Time division number This is indicated in the form of “n / N”. The number of time divisions (N) for frequencies registered in the item of “frequency” and the number (n) of the N time division regions used are shown. One of the above-mentioned time division areas corresponds to one communication channel. Therefore, the communication channel is specified by the time division number and the frequency number.

(4) Requesting terminal number The identification number of the wireless terminal device (requesting wireless terminal device) 1 that has requested the setting of the communication link is registered. In the present embodiment, the identification number of the wireless terminal device 1 is formed by a combination of the identification code of the group and the terminal number in the group. Specifically, the wireless terminal device 1 having the identification number “A1” indicates the wireless terminal device 1 having the terminal number “1” in the group having the identification code “A”. Therefore, it is possible to individually identify the wireless terminal device 1 from the identification number, and it is also possible to determine the group to which the wireless terminal device 1 belongs.

(5) Terminal priority The relative priority of the requesting wireless terminal device 1 in the group is determined and registered based on terminal information management information described later.

(6) Connection Destination Terminal Number The identification number of the wireless terminal device 1 (the connection destination wireless terminal device 1) specified as the connection destination in the request for setting the communication link is registered.

(7) Transmission / reception group priority The transmission / reception priority determined by the combination of the requesting wireless terminal device 1 group and the connection destination wireless terminal device 1 group is included in the transmission / reception group priority management information shown in FIG. It is determined and registered based on this. It should be noted that the number of wireless terminal devices 1 to be connected is two or more, and
Is the highest transmission / reception priority among transmission / reception priorities determined by a combination of the group of the requesting wireless terminal device 1 and the group of the wireless terminal devices 1 of the connection destinations. The degree is registered.

The transmission / reception group priority management information shown in FIG. 3 is a numerical value indicated at the intersection of a column corresponding to the group of the wireless terminal device 1 of the request source and a row corresponding to the group of the wireless terminal device 1 of the connection destination. Indicates transmission / reception priority. The smaller the notification, the higher the transmission / reception priority.

The same transmission and reception group priority management information is also provided in the frequency integrated management device 3.

(8) Transmission information emergency priority The transmission information emergency priority according to the transmission content specified by the requesting wireless terminal device 1 at the time of requesting the communication link setting is the transmission emergency priority management information shown in FIG. Is set based on the determination.

The transmission emergency priority management information shown in FIG. 4 describes a number indicating the transmission information emergency priority and transmission contents in association with each other. In the transmission emergency priority management information, an identification code of a group permitted to specify the transmission content described above is described. Further, in the transmission emergency priority management information, a voice recognition command used to specify each transmission content is described.

The same transmission emergency priority management information is also provided in the frequency integrated management device 3.

By the way, a voice command for designating a connection destination is inserted in a portion indicated as (dest.) In the example of the voice recognition command shown in FIG. The voice command designating the connection destination is set in a relationship as shown in FIG. 5, for example. Specifically, the voice command of “all terminals” or “all groups” specifies all wireless terminal devices 1 other than the wireless terminal device 1 of the request source as connection destinations,
It is recognized as designation of groups A to J.

(9) Usage Status In the case of a data record that is not used at all, “0” is set. In the case of a data record being used, “1” is set. Even after the use is over, it is set to “2” indicating that a communication channel is reserved for securing a communication channel within a group for a certain period of time (for example, one minute).
Although the use of the communication channel indicated by the pending data record has actually been terminated, it is possible to use the communication channel within the group for a certain period of time without notifying the frequency integrated management device 3 of that fact. You do it. When a request to release a channel is received from the frequency integrated management device 3, the held communication channel is immediately returned to the frequency integrated management device 3, and the usage status is set to “0”.

The details of the intra-group channel use management information have been described above.

On the other hand, each transmission / reception control device 2 manages the individual state of each wireless terminal device 1 belonging to the group to which the transmission / reception control device 2 belongs, based on terminal management information as shown in FIG.

FIG. 6 shows terminal management information relating to the group having the identification code "A".
10 each having an identification number from "1" to "A10"
An example in which there are two wireless terminal devices 1 is shown, and their identification numbers are set as headings.

In each of these wireless terminal devices 1, a priority is set in advance between terminals in the group, and the priority is registered as a terminal priority.

In association with each identification number, whether or not the wireless terminal device 1 having the identification number is in use (during communication) is registered as a use status. In this case, "0" is registered when not used, and "1" is registered when used.

Further, for the wireless terminal device 1 in use, the management number in the intra-group channel use management information for the communication link involving the wireless terminal device 1 is registered.

When the user specifies a call request, the wireless terminal device 1 transmits a connection start request including the terminal number of the wireless terminal device using a predetermined control channel. In addition,
Among the frequencies from “F001” to “F500”, “F001” is a dedicated emergency frequency for emergency communication,
The other “F002” to “F500” are set to normal frequencies for normal communication. Control channels are set for each of the emergency frequency and the normal frequency, and these control channels are selectively used depending on whether or not the user has specified an emergency.

Each transmission / reception control device 2 constantly monitors the control channel. When the above-mentioned connection start request arrives, it is determined whether or not the transmission source of the request belongs to the group corresponding to itself. Make a judgment. That is, from the terminal number indicated in the connection start request, the requesting wireless terminal device 1
Is identified, and it is determined whether or not the group is a group to which the own device corresponds. The transmission / reception control device 2 starts the link setting process if the transmission source of the request belongs to the group to which the request belongs, and otherwise ignores the incoming connection start request and does not start the link setting process. .

More specifically, a group having an identification code "A" in the communication area CA1 (hereinafter, referred to as an A group)
, The connection start request reaches each of the transmission / reception control devices 2-1 to 2-8, and accordingly, the transmission / reception control corresponding to the A group is performed. Only the device 2-1 starts the link setting process, and the transmission / reception control devices 2-2 to 2-8 corresponding to other groups ignore the connection start request.

When the transmission / reception control device 2 starts the link setting process, it waits for the arrival of a connection request that should arrive subsequently.

After the connection start request, the wireless terminal device 1 transmits a connection request for notifying the connection destination and the communication contents to the control channel. This connection request may be in the form of a data command including data indicating the connection destination and the communication content, or in the form of a voice recognition command uttered by the user.

Upon receiving this connection request, the transmission / reception control device 2 recognizes the terminal number and communication content of the wireless terminal device 1 to be connected from the connection request. Further, the transmission / reception control device 2
Recognizes the group to which it belongs from the terminal number of the wireless terminal device 1 of the connection destination and the transmission information emergency priority from the communication contents based on the transmission emergency priority management information shown in FIG.

The above operation is a common operation at the time of a connection request, and the subsequent operations change as follows according to the conditions of the link setting to be executed.

[Case 1: Normal communication (transmission information emergency priority of designated communication content is “07” or less) and wireless terminal device 1 to which connection is made belongs to the same group as wireless terminal device 1 of request source] First, the transmission / reception control device 2 checks whether or not the connection destination wireless terminal device 1 is in use with reference to terminal management information as shown in FIG. That is, it is checked whether the use status described in the terminal management information in association with the terminal number of the wireless terminal device 1 of the connection destination is “1 (use)”.

If the connection-destination wireless terminal device 1 is in use, connection is not possible at present, and the transmission / reception control device 2 sends a busy notification to the requesting wireless terminal device 1 or the like. Is performed, and the current link setting process is terminated.

However, if the wireless terminal device 1 at the connection destination is unused, the transmission / reception control device 2 subsequently checks the intra-group channel use management information (FIG. 2) and finds that the use status is "2
(Reserved) "is confirmed.

Here, if there is a data record whose use status is "2 (pending)", the communication channel indicated by the data record can be used. Assigns the frequency number and time division number of the usable communication channel (registered in the intra-group channel use management information) to each of the requesting wireless terminal apparatus 1 and the connection destination wireless terminal apparatus 1. This is notified to each of the requesting wireless terminal device 1 and the connection destination wireless terminal device 1.

As described above, when the requesting wireless terminal device 1 and the connection destination wireless terminal device 1 are notified of the assigned communication channel from the transmission / reception control device in this manner, the wireless terminal device 1 shifts to the communication state of the communication channel. . Accordingly, the requesting wireless terminal device 1 and the connection destination wireless terminal device 1 are in a communication state on the same communication channel, and are directly connected between the two terminals in a state as indicated by reference numeral a in FIG. Communication can be performed.

The transmission / reception control device 2 updates the request source terminal number, terminal priority, connection destination terminal number, transmission / reception group priority, and transmission information emergency priority in the data record to contents according to the current channel assignment. At the same time, the usage status is changed to “1 (use)”. Further, the transmission / reception control device 2 notifies the frequency integrated management device 3 of the update content of such a data record, and updates the corresponding management information of the frequency integrated management device 3.

If there is no data record whose use status is “2 (pending)”, the transmission / reception control device 2 requests the frequency integrated management device 3 to allocate a communication channel.

The frequency integrated management device 3 allocates a communication channel in response to an allocation request from the transmission / reception control device 2. In order to allocate the communication channel, the channel use management information as shown in FIG. And management based on use channel number limitation management information as shown in FIG.

Each piece of information included in the channel use management information shown in FIG. 7 is as described below.

(1) Management number A number for identifying a data record. It is set through all communication channels. Here, "F00
An example is shown in which the frequency from "1" to "F500" is time-divided into eight time-division regions and 4000 communication channels are set. Therefore, the management numbers are from "0001" to "4000". And all data records relating to each of the 4000 communication channels can be registered.

(2) Frequency number Same as the intra-group channel use management information shown in FIG.

(3) Time division number Same as the intra-group channel use management information shown in FIG.

(4) Assignment group number The identification code of the group to which the communication channel is assigned in the same data record is registered.

(5) Requester terminal number Same as the intra-group channel use management information shown in FIG.

(6) Connection destination terminal number Same as the intra-group channel use management information shown in FIG.

(7) Transmission / reception group priority Same as the intra-group channel use management information shown in FIG.

(8) Transmission information emergency priority Same as the intra-group channel use management information shown in FIG.

(9) Usage Status “0” is set when the communication channel indicated by the same data record is not used, and “1” is set when the communication channel is used. As for the communication channel in which the use status of the intra-group channel use management information shown in FIG. 2 is “2 (reserved)”, “1 (use)” is registered in the use status of the channel use management information.

The above is the details of the channel use management information.

On the other hand, each information included in the use channel number restriction management information shown in FIG. 8 is as described below.

(1) Group Number The identification codes of all the groups set in the system are registered in advance. That is, the usage channel number restriction management information holds data records for each group.

(2) Minimum Number of Channels Used The minimum number of communication channels to be allocated to each group is registered. The registered values are set in advance in consideration of the importance of the use of the communication line and the traffic volume in the work corresponding to each group.

(3) Maximum Number of Channels Used The number of communication channels that can be simultaneously allocated to each group is registered. The registered values are set in advance in consideration of the importance of the use of the communication line and the traffic volume in the work corresponding to each group.

(4) Number of currently used channels The number of communication channels actually allocated to each group at the present time is registered. The registered value is appropriately updated each time a new communication channel is allocated or an allocated communication channel is released.

The above is the details of the use channel number restriction management information.

When the frequency integrated management device 3 receives the assignment request from the transmission / reception control device 2, first, the number of communication channels currently used by the group corresponding to the transmission / reception control device 2 reaches the maximum number of available channels. It is checked whether or not there is no access channel number reference management information shown in FIG.

If the number of communication channels has reached the maximum number of available channels, communication channels cannot be allocated according to the above-mentioned allocation request. Therefore, in this case, the frequency integrated management device 3 notifies the requesting transmission / reception control device 2 of the fact and rejects the channel assignment.

On the other hand, if the number of communication channels has not reached the maximum number of available channels, the frequency integrated management device 3 continues to determine whether there is an available channel enough to secure the minimum number of available channels of each group. Is checked with reference to the use channel number limitation management information shown in FIG.

That is, for example, in the state shown in FIG.
As for the group, the number of used channels is “3” and exceeds the minimum number of used channels of “2”. Therefore, it is not necessary to secure an empty channel for the group A. However, for the B group, the number of used channels is currently “0”, which is less than the minimum number of used channels “1”. Therefore, it is necessary to secure one free channel for the B group. . For this reason, the number of communication channels corresponding to the sum of the value obtained by subtracting the number of currently used channels from the minimum number of used channels of each group (however, if the value is negative is “0”), Since it is necessary to always reserve as an empty channel, it is checked whether or not the total number of the current empty channels is larger than the number of channels that need to be reserved as the empty channel.

Therefore, if the total number of currently available channels is equal to or less than the number of channels that need to be reserved as available channels, the frequency integrated management device 3 requests that the number of available channels is insufficient. Original transmission / reception control device 2
And reject the channel assignment.

However, if there are more vacant channels than the number of channels that need to be reserved as vacant channels, the frequency integrated management device 3 selects one of these vacant channels, and The requesting transmission / reception control device 2 allocates the selected communication channel to the corresponding group, and notifies the requesting transmission / reception control device 2 to that effect.

When the transmission / reception control device 2 is notified of the allocated channel from the integrated frequency management device 3 in this way, the transmission / reception control device 2 transmits the allocated communication channel to the requesting wireless terminal device 1 and the connection destination wireless terminal device 1. To the requesting wireless terminal device 1 and the connection destination wireless terminal device 1 to that effect, between the requesting wireless terminal device 1 and the connection destination wireless terminal device 1 Direct communication.

[Case2: In normal communication, when the wireless terminal device 1 to be connected belongs to another group in the same communication area as the wireless terminal device 1 of the request source] In this case, the group to which the wireless terminal device 1 of the request source belongs The transmission / reception control device (requesting transmission / reception control device) 2 is responsible for confirming whether or not the connection destination wireless terminal device 1 is in use for the group to which the connection destination wireless terminal device 1 belongs. A request is made to the transmission / reception control device (connection destination transmission / reception control device) 2 via the frequency integrated management device 3.

The transmission / reception control device 2 at the connection destination that has received the confirmation request checks whether or not the wireless terminal device 1 at the connection destination is in use by referring to its own terminal management information (FIG. 6). . Then, the transmission / reception control device 2 of the connection destination notifies the confirmation result to the transmission / reception control device 2 of the request source via the frequency integrated management device 3.

The transmission / reception control device 2 of the request source cannot be connected at present if the wireless terminal device 1 of the connection destination is in use by the notification from the transmission / reception control device 2 of the connection destination. Therefore, after performing a busy notification or the like to the requesting wireless terminal device 1, the current link setting process ends.

However, if the connection destination wireless terminal device 1 is determined to be unused, the transmission / reception control device 2 of the request source is not used.
Then, it checks the in-group channel use management information and confirms whether there is a data record whose use status is “2 (pending)”.

Here, if there is a data record whose use status is "2 (pending)", the communication channel indicated by the data record can be used. Then, the transmission / reception control device 2 of the request source transmits the frequency number and the time division number of the usable communication channel (registered in the intra-group channel use management information) to the wireless terminal device 1 of the request source and the wireless terminal of the connection destination. It assigns to each of the devices 1 and notifies the requesting wireless terminal device 1 and the connection destination wireless terminal device 1 to that effect. The notification to the wireless terminal device 1 at the connection destination is performed via the frequency integrated management device 3 and the transmission / reception control device 2 at the connection destination.

As described above, when the requesting wireless terminal device 1 and the connection destination wireless terminal device 1 are notified of the assigned communication channel from the transmission / reception control device in this way, the wireless terminal device 1 shifts to the communication state of the communication channel. . Accordingly, the requesting wireless terminal device 1 and the connection destination wireless terminal device 1 are in a communication state on the same communication channel, and are directly connected between the two terminals in a state as indicated by reference numeral a in FIG. Communication can be performed.

Then, the transmission / reception control device 2 of the request source transmits the request source terminal number, terminal priority,
The connection destination terminal number, transmission / reception group priority, and transmission information emergency priority are updated to the contents according to the current channel assignment, and the usage status is changed to “1 (use)”.
Further, the transmission / reception control device 2 notifies the communication contents of such data records to the frequency integrated management device 3 and the transmission / reception control device 2 at the connection destination, and updates the corresponding management information.

By the way, if there is no data record whose use status is “2 (pending)”, the above-described C
As in the case of case 1, a request is made to the frequency integrated management device 3 to newly allocate a communication channel, and the communication channel is used by each of the requesting wireless terminal device 1 and the connection destination wireless terminal device 1.

[Case 3: In the case of normal communication, when the wireless terminal device 1 of the connection destination belongs to a group in a different communication area with the wireless terminal device 1 of the request source] In this case, the transmission / reception control device 2 of the request source transmits A request is made to the connected transmission / reception control device 2 via the frequency integrated management device 3 to check whether or not the wireless terminal device 1 is in use or whether there is a communication channel that can be assigned.

Upon receiving such a confirmation request, the transmission / reception control device 2 at the connection destination refers to the terminal management information (FIG. 6) of the connection destination to determine whether or not the wireless terminal device 1 at the connection destination is in use. Confirm. When the wireless terminal device 1 at the connection destination is not in use, the transmission / reception control device 2 at the connection destination further checks its own channel use management information in the group (FIG. 2) and determines that the use status is “2 (hold)”. Check if any data records exist.

If there is a data record whose use status is “2 (pending)”, the transmission / reception control device 2 at the connection destination determines that there is a communication channel that can be assigned. However, if there is no data record whose use status is “2 (pending)”, the case 1
As in the case of (1), the frequency integrated management device 3 is requested to allocate a new communication channel.

The transmission / reception control device 2 at the connection destination enables communication when the wireless terminal device 1 at the connection destination is not in use and a communication channel that can be allocated can be secured.
Otherwise, the result of confirming that communication is not possible is transmitted to the transmission / reception control device 2 of the request source by the frequency integrated management device 3.
Notify via

When receiving the notification of the confirmation result, the transmission / reception control device 2 of the request source sends a busy notification to the wireless terminal device 1 of the request source if the confirmation result indicates that communication is not possible. Then, the current link setting process ends.

However, if the confirmation result indicates that communication is possible, the requesting transmission / reception control device 2 checks its own channel use management information (FIG. 2), and the use status becomes “2 (hold)”. Check if the data record exists. If there is no data record whose use status is “2 (pending)”, the requesting transmission / reception control device 2 allocates a new communication channel to the frequency integrated management device 3 in the same manner as in Case 1 above. Request.

When a communication channel that can be allocated is secured by any of these, the transmission / reception control device 2 of the request source allocates the communication channel to the wireless terminal device 1 of the request source. To the wireless terminal device 1. In parallel with this, the transmission / reception control device 2 of the request source
Instructs the transmission / reception control device 2 of the connection destination to allocate a communication channel to the wireless terminal device 1 of the connection destination. In response to this, the transmission / reception control device 2 of the connection destination allocates the communication channel secured as described above to the wireless terminal device 1 of the connection destination, and notifies the wireless terminal device 1 of the connection destination to that effect.

Thus, both the requesting wireless terminal device 1 and the connection destination wireless terminal device 1 enter a communication state. However, in this case, since the requesting wireless terminal device 1 and the connection destination wireless terminal device 1 are both located in different communication areas, the transmission signal of each wireless terminal device 1 does not reach the other wireless terminal device 1.

Then, the requesting transmission / reception control device 2 enters a communication state on the communication channel allocated to the requesting wireless terminal device 1, whereby the requesting wireless terminal device 1 and the requesting transmission / reception control device 2 For example, a communication link is set in such a state as indicated by the reference character b in FIG.

When the transmission / reception control device 2 of the connection destination enters a communication state on the communication channel allocated to the wireless terminal device 1 of the connection destination, the transmission / reception control device of the connection destination and the transmission / reception control device of the connection destination are set. For example, a communication link is set in a state indicated by reference numeral C in FIG.

Then, the integrated frequency management device 3 communicates with the communication link between the requesting wireless terminal device 1 and the requesting transmission / reception control device 2 and the connection destination wireless terminal device 1 and the connection destination transmission / reception control device 2. The transmission and reception control device 2 of the request source and the frequency integrated management device 3
A communication link between the wireless terminal device 1 of the request source and the wireless terminal device 1 of the connection destination is set via the transmission / reception control device 2 of the connection destination, respectively, so that communication between the two terminals can be performed.

[Case 4: Case of emergency communication (transmission information emergency priority of designated communication content is "06" or more) and the wireless terminal device 1 to be connected is in use] In this case, the transmission / reception control device 2 of the request source Is based on the in-group channel usage management information of the wireless terminal device 1 to which the connection destination belongs if the wireless terminal device 1 belongs to its own group, and to the channel usage management information of the frequency integrated management device 3 if the wireless terminal device 1 belongs to another group. Then, the priority of the requested link is compared with the priority of the already set link.

That is, the requesting transmission / reception control device 2 determines the transmission / reception group from the group to which the requesting wireless terminal device 1 that has made the new request belongs and the group to which the connection destination wireless terminal device 1 specified by the request belongs. The priority is determined based on the transmission / reception group priority management information (FIG. 3). The transmission / reception control device 2 of the request source determines the transmission information emergency priority for the communication content specified by the new request based on the transmission emergency priority management information (FIG. 4). Then, the transmission / reception control device 2 of the request source transmits / receives the transmission / reception group indicated in the data record regarding the communication link in which the wireless terminal device 1 of the connection destination is included in the channel use management information in the group or the data record in the channel use management information. The priority and the transmission information emergency priority are obtained, and compared with the transmission / reception group priority and the transmission information emergency priority regarding the new request determined above. Only when the transmission / reception group priority and the transmission information emergency priority are higher for the new request, the transmission / reception control device 2 of the request source interrupts the wireless terminal device 1 of the connection destination. Notify the request via the control channel.

Note that the notification of the interrupt request is sent directly to the requesting transmission / reception control device 2 if the group to which the wireless terminal device 1 of the connection destination belongs is the same as the group assigned to the transmission / reception control device 2 of the request source. Do it. However, when the group to which the wireless terminal device 1 of the connection destination belongs is different from the group in charge of the transmission / reception control device 2 of the request source,
The transmission / reception control device 2 of the request source instructs the transmission / reception control device 2 of the connection destination to notify of the interrupt request via the integrated frequency management device 3. Upon receiving this instruction, the transmission / reception control device 2 at the connection destination notifies the wireless terminal device 1 at the connection destination of an interrupt request.

When notified of the interrupt request, the wireless terminal device 1 performs a notification operation such as display or voice output to notify the user of the notification.

When the user issues a switching instruction in response to the notification operation, the same communication channel is allocated to the requesting wireless terminal apparatus 1 and the connection destination wireless terminal apparatus 1 in response to the instruction. Processing for enabling communication between terminals is performed. Note that this processing is performed in the above-described Cases 1 to C.
This is performed in the same manner as in case3.

[Case 5: When all communication channels (excluding control channels) are in use in emergency communication] In this case, the transmission / reception control device 2 that has made the request sends the transmission / reception group to the integrated frequency management device 3. Request the search for the data record with the lowest priority and transmission information emergency priority.

In response to this request, the frequency integrated management device 3
Searches for the data record having the lowest transmission / reception group priority and transmission information emergency priority from the channel usage management information, and notifies the transmission / reception control procedure 2 of the request source of the searched data record.

On the other hand, the requesting transmission / reception control device 2 determines the transmission / reception group from the group to which the requesting wireless terminal device 1 having made the new request belongs and the group to which the connection destination wireless terminal device 1 specified by the request belongs. The priority is determined based on the transmission / reception group priority management information (FIG. 3). The transmission / reception control device 2 of the request source determines the transmission information emergency priority for the communication content specified by the new request based on the transmission emergency priority management information (FIG. 4).

The transmission / reception control device 2 of the request source sets the transmission / reception group priority and the transmission information emergency priority indicated in the data record notified from the frequency integrated management device 3 by the transmission / reception group related to the new request determined above. The priority is compared with the transmission information emergency priority. If both the transmission / reception group priority and the transmission information emergency priority are higher for the new request, the communication link indicated in the data record is released.

This communication link release processing is performed via the transmission / reception control device 2 of the group to which the requesting wireless terminal device 1 and the connection destination wireless terminal device 1 involved in the communication link belong. A communication termination instruction is given to each of the wireless terminal device 1 and the wireless terminal device 1 to be connected. When receiving the communication end instruction, the wireless terminal device 1 ends the communication.

Then, the communication channel that has become an empty channel is allocated to the requesting wireless terminal device 1 and the connection destination wireless terminal device 1, and processing for enabling communication between the two terminals is performed. This processing is performed in the above-described Case.
1 to Case 3 are performed in the same manner.

The above is an example of the operation of setting a communication link in various cases.

When the communication is terminated, the transmission / reception control device 2 in charge of the group to which the requesting wireless terminal device 1 belongs in the terminated communication is sent to the transmission / reception control device 2 in the corresponding data record in the intra-group channel use management information. Update “usage status” to “2 (pending)”. After that, if it is not used within the group until a certain time elapses, the transmission / reception control device 2 updates the “usage status” to “0 (free)” and releases the communication channel by frequency integration. Notify the management device 3. In response to this, the frequency integrated management device 3 changes the “usage status” of the corresponding data record in the channel use management information to “0 (fre
e) ".

As described above, according to the present embodiment, all of the communication channels available in the system can be used as necessary, regardless of the group to which each belongs.
, Wireless resources can be effectively used, and the wireless terminal devices 1 belonging to different groups can communicate with each other using the same communication channel, and communication between different groups can be performed.

The conditions for setting the communication link are as follows:
Since each group is made different depending on the contents of the airport service corresponding to it and the use status of the communication channel at the time of setting the communication link, for example, communication related to airport service of lower importance for communication of airport service of lower importance It is possible to perform an appropriate system operation, such as preventing the user from being hindered.

Further, according to the present embodiment, since the conditions regarding the setting of the communication link are made different depending on the contents of the communication, the communication channel is preferentially set for setting the communication link for the emergency communication. It is possible to assign

According to the present embodiment, a free channel is ensured so that the communication channel having the minimum number of channels set for each group is always allocated to the wireless terminal device 1 belonging to the group. Therefore, it is possible to effectively prevent a case where a communication channel is occupied by another group and a group in which a required number of communication channels cannot be secured occurs.

Further, according to the present embodiment, the communication channels are allocated so that the number of communication channels simultaneously allocated to the wireless terminal devices 1 belonging to each group does not exceed the maximum number of use channels set for each group. Is performed, it is possible to prevent a situation where a large number of communication channels are occupied by a specific group and a required number of communication channels cannot be secured in another group.

Further, according to the present embodiment, when an urgent connection request specifying the communicating wireless terminal device 1 as a connection destination is made, the priority of the newly made connection request is higher. Prompts the end of the communication that has already been performed and promptly sets up the communication link, so that more important urgent requirements can be promptly notified to the user of the wireless terminal device 1 that is communicating. It is possible.

Further, according to the present embodiment, when setting a new communication link for the communicating wireless terminal device 1 as described above, the user is notified of the fact to the user. Since the switching instruction is performed by the user, even if the communication is urgent, the switching can be performed by the user's intention by recognizing the communication, and it is possible to prevent the connection partner from being unexpectedly switched.

Further, according to the present embodiment, even when all communication channels are in use, when an urgent connection request is made, the communication link with lower priority communication is performed. Is forcibly released and the communication channel used there is released, and a communication link is set up based on the urgent connection request using this released communication channel, so that emergency communication must be started reliably. Is possible.

Further, according to the present embodiment, since the transmission / reception control device 2 is provided in one-to-one correspondence with each group,
Although the number of groups set according to the airport to which the application is applied varies, it is possible to construct a system with a minimum configuration suitable for such various applications. Also, when a group is added, it can be easily handled by adding the transmission / reception control device 2 and updating various management information.

According to the present embodiment, the frequency integrated management device 3 is provided with an exchange connection function, and the communication links set between the two sets of wireless terminal devices 1 and the transmission / reception control device 2 are exchange-connected. Communication between wireless terminal devices 1 existing in different communication areas can also be enabled.

Further, according to the present embodiment, the transmission / reception control device 2 is provided with the voice recognition function, and the connection request can be made by the voice recognition command.
Does not require a mechanism for the user to specify the connection destination.

Note that the present invention is not limited to the above embodiment, and various modifications as described below are possible.

(1) In the above embodiment, all communication channels are dynamically managed. However, by deciding a communication channel corresponding to each terminal partly or allocating a communication channel that can be used for each group in advance, a communication channel that can be surely used by the terminal or the group is secured to some extent in advance. May be.

(2) The same frequency may be used at the same time if the effective radio wave propagation ranges of different communication areas do not overlap. However, when the radio wave propagation effective ranges overlap, the same frequency is centrally managed in both communication areas so that the same frequency is not used simultaneously.

(3) In the above embodiment, when the requesting wireless terminal device 1 and the connection destination wireless terminal device 1 exist in the same communication area, the same communication channel is allocated to each of the terminals. It is assumed that terminals communicate directly with each other. However, if there is a possibility that the separation distance between the two terminals may increase, the exchange connection in the transmission / reception control device 2 or the integrated frequency management device 3 may be always or partially performed according to conditions. good.

(4) In the above embodiment, the transmission / reception control device 2 is provided with the voice recognition function, and the transmission / reception control device 2 identifies the voice recognition command. The management device 3 may be provided with a voice recognition function, and these devices may identify voice recognition commands.

(5) In the above embodiment, the communication channel is set using a combination of the frequency division method and the time division method. However, either one of the frequency division method and the time division method, the phase modulation method, CDM (Code Div
Another method such as an ision multiplex method or a combination thereof may be used.

(6) In the above embodiment, the communication link is set so that the two wireless terminal devices 1 perform one-to-one communication, but between three or more wireless terminal devices. The communication link may be set so as to perform multi-user communication or one-to-many communication.

(7) In the above embodiment, the interrupt processing is always performed under a certain condition. However, the interrupt processing method is changed, for example, by changing the priority information used for determining the interrupt. It may be provided with a function of changing it appropriately or canceling the interrupt processing in response to a request from the wireless terminal device (in accordance with the user designation 9).

(8) In the above-described embodiment, in order to form a link for an emergency communication, the communication that has already been performed is terminated when the connection destination wireless terminal device 1 is in a call or when there is no available communication channel. However, after the end of the emergency communication, the communication that has been terminated to form a link for the communication may be automatically returned.

(9) In the above embodiment, the number of divided frequency bands is "500" and the number of time divisions of one divided frequency band is "8", but these may be arbitrary. Further, the number of time divisions may be different for each divided frequency band.

(10) The transmission / reception control device 2 need not be provided for each group, and one transmission / reception control device 2 may be responsible for a plurality of groups.

The function of the transmission / reception control device 2 may be imparted to the integrated frequency management device 3.

(11) A wired network in an airport or another communication network may be connected to the integrated frequency management device 3, and the terminals accommodated in these networks may be exchanged with the wireless terminal device 1.

(12) In addition, various modifications can be made without departing from the spirit of the present invention.

[0153]

According to the first aspect of the present invention, there are provided a plurality of wireless terminal devices each belonging to one of a plurality of groups which are set by classifying predetermined operations related to airport operation, and these wireless terminal devices are provided. In an airport wireless communication system that enables a device to communicate with another predetermined terminal device, in response to a connection request having at least one of a request source terminal and a connection destination terminal as the wireless terminal device, Communication link setting means for setting a communication link between the request source terminal and the connection destination terminal, a use state of a communication channel available in the system, and a wireless terminal as the request source terminal and the connection destination terminal Limiting means for limiting setting of a communication link by the communication link setting means based on a condition set for at least one of groups to which the device belongs Because with a, as well as effectively use the entire frequency band, it becomes possible to perform communication between groups.

Further, according to the second invention, the restricting means in the first invention is adapted to use the communication channel usable in the system, the radio terminal device as the request source terminal and the connection destination terminal. In addition to the conditions set for at least one of the groups to which the requesting terminal belongs, the setting of the communication link by the communication link setting means is restricted based on the communication content requested by the requesting terminal. The communication link is set in consideration of the importance of the communication content and the like, and effective measures for system operation such as giving priority to more important communication can be taken.

According to a third aspect of the present invention, the restricting means according to the first aspect of the present invention further comprises: Since the communication channel is secured so that it can be used at all times for forming a link, the setting of the communication link by the communication link setting means is permitted only when there is another remaining communication channel. The communication links are set so that a predetermined number of communication channels can always be assigned to each group, and it is possible to always secure the minimum communication channels for each group.

According to a fourth aspect of the present invention, the limiting means according to the first aspect of the present invention further comprises the step of: Since the setting of the communication link by the communication link setting means is allowed only for the wireless terminal devices belonging to the group not used for forming the link, the number of communication channels used in each group is limited. Thus, it is possible to prevent a specific group from occupying many communication channels.

Further, according to the fifth aspect, the limiting means according to the first aspect of the present invention can be configured such that the terminal device in communication is set as a connection destination terminal and a communication link setting is requested.
If the predetermined priority set for the request source terminal is higher than the predetermined priority set for the terminal device communicating with the connection destination terminal, the communication link already set for the request connection destination And the communication link setting means according to the request is set to the communication link setting means, so that even when the connection destination terminal is communicating, the communication with the higher priority is interrupted. Thus, it is possible to reliably perform high-priority communication.

According to the sixth invention, when there is no communication channel usable for setting a communication link, at least one of the terminal devices which are already communicating is provided when the limiting means in the first invention is not available. After eliminating a communication link used in communication lower than the predetermined priority determined according to one of the predetermined priority determined according to at least one of the requesting terminal and the connection destination terminal, Since the communication link setting means is set to the communication link setting means in response to the request, even in a situation where all of the communication channels are used, by ending the communication with the lower priority, an empty channel can be set. As a result, the communication with higher priority is interrupted and the communication with higher priority can be reliably performed.

According to the seventh invention, in addition to the fifth invention or the sixth invention, prior to canceling a communication link which has been set, communication is performed by using the communication link. The disconnection notification means for notifying the terminal device that the communication link has been canceled is provided, so that the terminal device communicating with the communication link is notified in advance that the communication link will be canceled. The communication is not abruptly disconnected.

According to an eighth aspect of the present invention, in the terminal device according to the seventh aspect of the present invention, the restriction unit is notified by the disconnection notifying unit and then communicates with the communication link whose disconnection permission is canceled. Since the communication link is canceled according to the information given by the communication link, the communication link is canceled according to the intention of the disconnected side, and the communication link is disconnected at a timing when there is a problem. Can be prevented from being eliminated.

According to a ninth aspect, the communication link setting means according to the first aspect is provided for each of the groups, and sets up a communication link between wireless terminal devices belonging to the group. An internal link setting unit, and a communication link between a certain wireless terminal device and another terminal device that does not belong to the group to which the wireless terminal device belongs. Since it is configured from the out-of-group link setting means to be set via the setting means, the setting of the communication link within the group and the setting of the communication link between the multi-groups are processed separately. The setting of the communication link within the group is quickly performed only by the intra-group link setting means.

According to the tenth aspect, in addition to the first aspect, there is provided voice recognition means for recognizing a predetermined voice command to identify the content of a communication link setting request, and The means and the limiting means, based on the identification result in the voice recognition means, to set the communication link and to limit the communication link setting, the communication link setting request will be accepted by a voice command, It is not necessary to provide a function for transmitting a special command in the wireless terminal device.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main configuration of an airport wireless communication system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a data structure of intra-group channel use management information.

FIG. 3 is a diagram showing a data structure of transmission / reception group priority management information.

FIG. 4 is a diagram showing a data structure of transmission emergency priority management information.

FIG. 5 is a diagram showing an example of a voice command for specifying a connection destination in a voice recognition command.

FIG. 6 is a diagram showing a data structure of terminal management information.

FIG. 7 is a diagram showing a data structure of channel use management information.

FIG. 8 is a diagram showing a data structure of use channel number restriction management information.

[Explanation of symbols]

 1: Wireless terminal device 2 (2-1 to 2-10): Transmission / reception control device 3: Frequency integrated management device

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference)

Claims (13)

[Claims] A wireless terminal device includes a plurality of wireless terminal devices belonging to one of a plurality of groups that are set by classifying predetermined operations related to airport operation, and these wireless terminal devices are other predetermined terminal devices. In an airport wireless communication system capable of communicating with a request source terminal and a connection destination in response to a connection request being made with at least one of the request source terminal and the connection destination terminal being the wireless terminal device, A communication link setting unit for setting a communication link with a terminal; a use state of a communication channel available in the system; and at least one of a group to which a wireless terminal device as the request source terminal and the connection destination terminal belongs Limiting means for restricting the setting of the communication link by the communication link setting means based on the condition set for one of them. Airport in a wireless communication system that. 2. The method according to claim 1, wherein the limiting unit sets a use state of a communication channel available in the system and at least one of a group to which the wireless terminal device as the request source terminal and the connection destination terminal belongs. 2. The airport wireless communication system according to claim 1, wherein the setting of the communication link by the communication link setting means is restricted based on communication contents requested by the request source terminal, in addition to the set conditions. 3. The method according to claim 1, wherein the limiting unit is configured to always use a communication channel having a minimum number of use channels set for each of the groups so as to always form a communication link for a wireless terminal device belonging to each group. 2. The wireless communication system in an airport according to claim 1, wherein, after securing a communication channel, setting of a communication link by the communication link setting means is permitted only when another remaining communication channel exists. 4. The wireless communication apparatus according to claim 1, wherein the limiting unit is configured to assign a maximum number of communication channels set for each of the groups to a wireless terminal belonging to a group that is not used to form a communication link for a wireless terminal device belonging to the group. 2. The airport wireless communication system according to claim 1, wherein setting of a communication link by said communication link setting means is permitted only for a terminal device. 5. The communication device according to claim 1, wherein the limiting unit is configured to, when a terminal device under communication is set as a connection destination terminal and a communication link setting is requested, the predetermined priority set in the request source terminal be set to the connection destination terminal. If the priority is higher than a predetermined priority set for the terminal device that is communicating with the server, after canceling the communication link already set for the requested connection destination, the communication link setting according to the request is performed. 2. The airport wireless communication system according to claim 1, wherein the communication link setting unit performs the setting. 6. When there is no communication channel available for setting up a communication link, said limiting means sets a predetermined priority determined according to at least one of said terminal devices already in communication with said request source. After eliminating the communication link used in communication lower than a predetermined priority determined according to at least one of the terminal and the connection destination terminal,
2. The airport wireless communication system according to claim 1, wherein the communication link setting unit is configured to set a communication link in response to the request. 7. A disconnection notifying means for, prior to canceling a communication link that has already been set, notifying a terminal device communicating with the communication link that the communication link has been canceled. The airport wireless communication system according to claim 5 or 6, wherein: 8. The restriction means cancels the communication link in response to the notification by the disconnection notification means being given from a terminal device which is communicating with the communication link to be canceled by the disconnection permission. The wireless communication system in an airport according to claim 7, wherein: 9. The communication link setting means, provided for each group, for setting a communication link between wireless terminal apparatuses belonging to the group, an intra-group link setting means, a wireless terminal apparatus and its wireless Out-of-group link setting means for setting a communication link between another terminal device that does not belong to the group to which the terminal device belongs through the in-group link setting means of the group to which the wireless terminal device connected to the communication link belongs 2. The method according to claim 1, further comprising:
2. A wireless communication system in an airport according to claim 1. 10. A voice recognition unit for recognizing a predetermined voice command to identify the content of a communication link setting request, wherein said communication link setting unit and said restriction unit are based on a result of identification by said voice recognition unit. 2. The airport wireless communication system according to claim 1, wherein the setting of the communication link and the restriction of the communication link setting are performed. 11. A plurality of wireless terminal devices belonging to one of a plurality of groups that are set by classifying predetermined operations related to airport operation can communicate with another predetermined wireless terminal device. In the airport wireless communication control device, a communication link between the request source terminal and the connection destination terminal in response to a connection request made with at least one of the request source terminal and the connection destination terminal being the wireless terminal device A communication link setting means for setting a communication channel usable in the system, and at least one of a group to which the wireless terminal device as the request source terminal and the connection destination terminal belongs Limiting means for limiting the setting of the communication link by the communication link setting means based on the conditions set forth above. Control device. 12. A plurality of wireless terminal devices belonging to any one of a plurality of groups that are set by classifying predetermined operations related to airport operation can communicate with another predetermined wireless terminal device. An airport wireless communication control device is configured together with a predetermined integrated management device, and an intra-group link setting for setting a communication link between wireless terminal devices belonging to a predetermined charge group among the plurality of groups. A group control device comprising means. 13. A plurality of wireless terminal devices belonging to any one of a plurality of groups which are set by classifying predetermined operations related to airport operation can communicate with another predetermined wireless terminal device. 13. An airport wireless communication control device comprising the group control device according to claim 12, wherein a communication link between a certain wireless terminal device and another terminal device not belonging to a group to which the wireless terminal device belongs. An outside group setting means for setting the group via the group control device which sets the group to which the wireless terminal device connected to the communication link belongs to as the assigned group.