JP5018618B2 - Repeater device and communication terminal - Google Patents

Description

  The present invention relates to a repeater device and a communication terminal, and more particularly to a repeater device and a communication terminal configured to maintain a normal relay function even in a situation where the communication state of a set control channel or communication channel is deteriorated.

In land mobile radio (LMR) such as commercial radio communication systems for disaster prevention and administration, amateur radio, etc., except for some, one of the communication terminals transmits and the other receives the operation alternately. The press talk method (simplex method or simplex method) is repeated.
In general, the land mobile radio communication apparatus is set to have a relatively small transmission power. Therefore, when the distance is some distance, the transmission signals of each other often do not reach the other party directly. Therefore, repeater devices (wireless relay station devices) are conventionally provided everywhere, but there are various types of equipment depending on the number of communication terminals using the repeater devices.
For example, many amateur radio communication systems and specific low-power radio communication systems have relatively small facilities, and many have one control channel repeater and a small number of communication channel repeaters.
FIG. 12 is a schematic configuration diagram showing an example of a conventional small-scale repeater apparatus. The repeater apparatus shown in this example includes one control channel repeater 21, two communication channel repeaters 22, 23, and two antennas 24, 25 connected via an antenna duplexer (not shown) and various filters. ing. In FIG. 12, a portable wireless communication device is shown as a communication terminal using the repeater device, 26 is a calling side communication terminal (transmitting terminal), 27 is a communication terminal (receiving terminal) to be called, Reference numeral 28 denotes another communication terminal (standby terminal) waiting for communication.
Of course, although not shown in the figure, the power supply device and other facilities necessary for functioning as a repeater device are also provided. In particular, since the repeater device is often installed in a place where commercial power is not available, such as a mountain peak, there are many examples including a solar cell or a battery as the power supply device.

As is well known, in the amateur radio communication system, the communication channel frequency and the communication channel frequency for the repeater device are determined, and the control channel repeater 21 and the communication channel repeaters 22 and 23 function as repeaters at the set transmission / reception frequencies. In many cases, the unit is configured to be configured. In actual communication operation, each of the communication terminals 26 to 28 intercepts (receives) the control channel transmitted from the control channel repeater 21 of the repeater device, and belongs to the communication range of which repeater device the own station belongs to. Is aware.
If necessary, when a call is made from the communication terminal 26 to the repeater device using the control channel frequency, the control channel repeater 21 of the repeater device that has received the call transmits the communication channel in the idle state (empty state) detected in advance. A repeater is selected, and its communication channel repeater information (call code and frequency) is transmitted to the calling communication terminal 26, the receiving communication terminal 27, and the standby communication terminal 28 via the control channel frequency. Of the communication terminals that have received these information, the calling communication terminal 26 and the receiving communication terminal 27 that perform communication set the frequency and call code of the designated communication channel repeater, and thereafter the communication channel repeater 22 or 23 to communicate with each other.
The communication in this case may be a press talk (simplex) system in which transmission and reception are alternately repeated, or a simultaneous transmission / reception (duplex) system. In addition, as a technology related to the repeater device, Patent Document 1 proposed by the same applicant discloses an invention relating to a repeater device that automatically connects a communication line in response to a request from a calling communication terminal. Patent Document 2 discloses means for automatically searching for a vacant channel (vacant) channel and notifying vacant channel information when a call is made from a calling communication terminal. You can refer to it when you know the configuration of the terminal.
Japanese Patent Laid-Open No. 62-104229 JP-A-61-9022

However, in the conventional repeater device, the channel frequency of the control channel repeater 21 and the two (plurality) communication channel repeaters 22 and 23 is fixed to a specific frequency, so that the channel frequency is strong. When normal communication is not possible due to jamming radio waves or fading, the wireless relay function is not performed and communication is often lost. For example, when the interference or fading is severe at the channel frequency of the control channel repeater 21, all the terminal devices obtain information necessary for using the repeater device via the control channel, so the repeater device itself. Can not be used. Even if the control channel is communicable, even if normal communication cannot be performed due to similar interference or fading at the frequency of the assigned communication channel repeater, it is impossible to perform normal communication. Such a problem is serious in a relatively small repeater apparatus having a small number of communication channel repeaters, such as a repeater apparatus in an amateur radio communication system.
The present invention has been made in view of various circumstances in such a conventional repeater device, and even if normal communication is impossible due to obstruction, fading, or the like in the control channel or communication channel, the normal wireless relay function is achieved. It is an object of the present invention to provide a repeater device that increases the possibility of maintaining the communication performance and a communication terminal that uses the repeater device.

In order to solve such a problem, the present invention provides a calling side communication terminal in a repeater device that includes a control channel repeater and a plurality of communication channel repeaters and performs wireless relay between communication terminals. Control channel state detection means for recording transmission failure information or / and transmission retransmission number information included in a signal transmitted from the control channel via the control channel, and preset the recorded transmission failure information or / and transmission retransmission number information Means for comparing with the received threshold information, communication channel vacant line detecting means for detecting whether or not the communication channel repeater is in a vacant state, and recorded transmission failure information or / and transmission retransmission count information exceeding the threshold value. Control channel switching information generating means for generating information indicating that the communication channel repeater in the idle state is switched to the control channel repeater; Transmits the serial generated control channel switching information to the communication terminal, based on the control channel change information, characterized by comprising a repeater switching means for switching the corresponding communication channel repeater to the control channel repeater.
According to a second aspect of the present invention, in the repeater device according to the first aspect, the communication channel repeater instructs the repeater switching means to switch the communication channel repeater to the control channel repeater based on the control channel switching information. It is configured to function as a control channel repeater when received.

According to a third aspect of the present invention, in the repeater device according to the first or second aspect, the communication channel repeater and the control channel repeater transmit a frame signal continuously or as necessary to control to a required position. Controlled as a logical control channel or a logical communication channel that arranges and transmits data including necessary control information or a voice signal with a flag indicating that it is a channel or a communication channel, and the logical control channel The present invention is characterized in that the control channel repeater and the communication channel repeater are switched by switching logical communication channels to each other.
Invention of Claim 4 is related with a communication terminal , Comprising: It is a communication terminal which communicates with another communication terminal via the repeater apparatus as described in any one of Claim 1 thru | or 3 , Comprising : In said repeater apparatus Transmission failure information indicating that the repeater device did not respond when a call was made to the device, and / or means for recording transmission retransmission number information, and the transmission failure information in the transmission signal to the repeater device, Or / and a means for adding transmission retransmission count information and the specified channel when receiving control channel switching information indicating that a channel frequency other than the control channel currently in use is switched to the control channel from the repeater device. And a control means for communicating as a control channel.

Since the present invention is configured and controlled as described above, when the communication state of the control channel repeater in use deteriorates, other communication channel repeaters with good communication state can function as alternative control channel repeaters. Conventionally, when communication in the control channel repeater is impossible, the problem that the repeater device itself does not function is solved, and if any of the communication channels can be used, the relay function can be maintained.
Also, regarding the communication channel repeater, when the communication quality deteriorates, the normal relay function can be maintained by using a normal control channel repeater or control channel as the communication channel.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. However, the components, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention only unless otherwise specified. .
FIG. 1 is a block diagram showing an embodiment of a schematic configuration of a repeater device according to the present invention. The repeater device 1 shown in this example includes a control channel repeater 2, two communication channel repeaters 3 and 4, an antenna duplexer and various filters not shown, as in the conventional example shown in FIG. There are two antennas 5 and 6 connected to each other. In addition, as a communication terminal using the repeater device 1, a call-side communication terminal (transmission terminal) 7, a call-target communication terminal (reception terminal) 8, and other communication standbys assuming a portable wireless communication device The communication terminal (standby terminal) 9 is illustrated.
Although not shown in the drawings, the power supply device and other facilities necessary for functioning as a repeater device are also provided, and the power supply device may include a solar cell or a battery as described above. Then, the control means for making it function as it demonstrates in detail below is provided. This control means may be provided with a control unit repeater 2 and communication channel repeaters 3 and 4 distributed or provided with a new control unit (not shown) for centralized control.
The characteristic point of the present invention is that, as will be described in detail below, when it is determined that the control channel repeater 2 has a problem in controlling the radio relay apparatus based on the control channel frequency being used, the communication channel repeater 3 or 4 It is provided with a control function to switch any one of the empty line repeaters to function as a control channel repeater. A control example for this will be described in detail for each repeater device and communication terminal device.

FIG. 2 is a flowchart showing an example of control of the communication terminal according to the present invention. When a communication terminal (transmission terminal) makes a call to another communication terminal (reception terminal) via the repeater apparatus according to the present invention. This is an example of control. It is assumed that the communication terminal and the repeater device are configured to perform various controls as described below. In the following control flow, the control channel communication state detection process, the communication channel empty line detection process, and the like are omitted for the sake of simplicity.
First, the communication terminal is configured to store transmission failure information when there is no response from the repeater device when a call is made to the repeater device before that time. When the flow shown in FIG. 2 starts, the communication terminal determines whether or not transmission failure information is recorded (S1, Yes), and superimposes the recorded content on the transmission radio wave for the repeater device. Preparation is performed (S2). Next, the communication terminal determines whether or not the information on the number of transmission retransmissions performed for the repeater device before is recorded, and when the information on the number of retransmissions for transmission is recorded (S3, Yes), Preparation is made to superimpose the contents on the transmission radio wave for the repeater device (S4). That is, the processes of S2 and S4 are processes for determining the respective recorded contents and, if recorded, temporarily storing them in a memory, for example, in order to superimpose the contents on the transmission radio wave to the repeater device. . When the processing is completed, the repeater device is actually randomly accessed via the determined control channel, and the transmission failure information and the transmission retransmission count information stored in the memory are transmitted (S5).
If there is a response to the call from the control channel repeater of the repeater device (S6, Yes), the communication channel repeater information in the empty line state included in the control channel signal is acquired (S7), and the control is further performed. It is checked whether or not control channel repeater switching information is included in the signal from the channel repeater (S8). The control channel repeater switching information will be described later.

In this determination process S8, when the control channel repeater switching information is not included (S8, No), the channel frequency for the designated communication channel repeater is locked (S9), and transmission is performed to the communication channel repeater ( S10). Thereafter, necessary communication is performed with the target communication terminal (receiving terminal) via the communication channel repeater, and when the communication is completed, or communication is attempted via the designated communication channel repeater. However, if the target communication cannot be performed due to interference on the communication channel repeater line, the communication is terminated (S11), and the control channel frequency (conventional control channel frequency) is locked. (S12), the presence or absence of retransmission is confirmed with the control channel repeater performed in S5. (S13). That is, if the access to the control channel repeater is established without being retransmitted (S13, No), the flow is terminated. If retransmission is being performed to the control channel repeater (S13, Yes), The retransmission number information is recorded in the memory of the terminal device (S14) and statistical processing of the number information is performed (S15).
On the other hand, if there is no response from the control channel repeater in the above process S6 (S6, No), the transmission failure information is recorded in the memory of the communication terminal (S16), and the statistical processing of the frequency information is performed and the statistical processing result is displayed. The data is recorded in a required memory (S17), and the process is terminated. Or it returns to S1 of this flow and repeats the same processing. The statistical processing of the number information in S15 and S17 can be considered in various cases. For example, but not limited to this, the comparison processing with a preset number of times threshold value or the case where the position information can be acquired is called. Statistical processing of the relationship between the location information of points and the number of retransmissions may be considered.
If the control channel repeater switching information is included in the signal from the control channel repeater in the process S8 (S8, Yes), the frequency of the designated communication channel repeater is locked according to the instruction (step S8). Along with S18), communication is performed with the necessary communication terminal via the communication channel repeater (S19). When necessary communication is completed via the communication channel repeater (S20), the newly designated channel (repeater) is changed to the control channel. It recognizes as a repeater, locks to that channel frequency (S21), and ends the process.

If configured or controlled as described above, the remaining communication channel repeaters or control channel repeaters can communicate even if either the control channel repeater or the communication channel repeater cannot be used. If so, a normal wireless relay function can be maintained.
That is, the communication terminal shown in this example includes a transmission failure information indicating that the repeater device has not responded when a call is made to the repeater device, and / or means for recording the number of transmission retransmissions, and the repeater device. Means for adding the transmission failure information or / and the number of transmission retransmissions to the transmission signal for the control signal, and control channel switching information indicating that the channel frequency other than the control channel currently in use is switched to the control channel from the repeater device Means for performing communication using the designated channel as a control channel. The “means for recording transmission failure information or / and the number of transmission retransmissions” includes both a means for recording transmission failure information and a means for recording the number of transmission retransmissions, or one of them. The communication terminal further includes a means for recording transmission failure information, a means for recording the number of transmission retransmissions, a means for adding transmission failure information and the number of transmission retransmissions, and a channel frequency other than the currently used control channel. Means for communicating with the designated channel as the control channel when receiving control channel switching information indicating switching to the control channel.
By the way, although the example provided with two communication channel repeaters was shown in this example, the present invention can be applied even when more communication channel repeaters are included, and the communication maintenance is increased as the number of communication channel repeaters is increased. The possibility increases. In addition, although there is a balance with various regulations, the present invention can be applied to a device provided with a plurality of control channel repeaters as necessary.

FIG. 3 is a flowchart showing a control example of a receiving-side communication terminal (receiving terminal) among the communication terminals according to the present invention. First, it normally waits for an incoming call at a designated control channel frequency (S31), and is positioned within the communication area of any repeater device by receiving a control signal from the repeater device as necessary. If it is determined that it is located in the communicable area (S32, Yes), it waits for an incoming call at the control channel frequency in the repeater device (S33). When an incoming call is received from the control channel repeater in this state (including the case where there is an incoming call), the designated communication channel repeater information is obtained (S34), and whether or not the control channel switching information is included therein. If it is not included (S35, No), it is locked to the designated communication channel frequency (S36) and transmitted from the communication channel repeater (transmitted from the calling communication terminal, A signal relayed by the repeater is received (S37). When the necessary communication is completed (S38), since the control channel repeater information is not included, the switching control instruction is not issued, the control channel frequency is locked (S39), the flow returns to the control channel and the flow ends. .
On the other hand, if it is determined in the processing S32 that it is not located within the communication range of any repeater device (S32, No), the other control channel frequency is scanned to search for an incoming control channel (S40), As a result of the search, it is determined whether or not the obtained control channel is different from the conventional one. If not (S41, No), the process returns to the above-described processing S31, but if different (S41, Yes), a new control is performed. A process of locking to the channel frequency is performed (S45).
In addition, when the control channel switching information (control channel repeater switching information) is included in the radio wave from the control channel repeater in the processing S35 (S35, Yes), the communication channel frequency of the designated communication channel repeater is set. It locks (S42) and receives the signal transmitted from the communication channel repeater (S43). When the necessary communication is completed (S44), since the control channel repeater information is included in the process S35, it is locked to the designated new control channel frequency (S45), and the flow is terminated.
According to this configuration or control, the communication terminal waiting for reception is also normal in response to the switching control of the control channel repeater and the communication channel repeater performed between the calling communication terminal and the repeater device. Communication can be maintained.

FIG. 4 shows a control example of another standby communication terminal (standby terminal), which is transmitted from the control channel repeater of the repeater device while waiting for an incoming call with the previously specified control channel frequency (S51). It is determined whether or not the control channel switching information (information indicating that the communication channel repeater has been changed to the control channel repeater) is included in the received signal (S52, No). Then, it is determined whether or not it is located outside the communicable range, and if it is determined that it is located within the communicable range (S53, No), the flow is ended (or the same processing is performed by returning to S51). Repeat). If it is determined in step S53 that the mobile phone is located outside the communication range (S53, Yes), the control channel frequency with the incoming call is searched (S54), and the detected new control channel frequency is set. Locking is performed (S55), and standby processing is performed on the control channel (S51). Also, when the control channel switching information is included in the process S52 (S52, Yes), the process proceeds to the process S55, locks to a new control channel frequency (S55), and waits on the control channel. Processing is performed (S51).
According to this process, the other communication terminals on standby are switched according to the switching control of the control channel repeater and the communication channel repeater performed between the calling communication terminal and the repeater device. Communication over the channel can be maintained.

FIG. 5 is a flowchart showing a processing example of the control channel repeater in the repeater apparatus according to the present invention. When an access signal (control channel frequency signal) for the repeater device is received from the calling communication terminal (transmission terminal) (S61), it is determined whether or not transmission failure information is added, and transmission failure information is added. If yes (S62, Yes), the transmission failure information is recorded in the memory (S63). Further, it is determined whether or not the transmission retransmission number information is included in the received signal. If included (S64, Yes), the transmission retransmission number information is recorded in the memory (S65), and the transmission is not established. The information is compared with a preset threshold value (condition), and it is determined whether or not the threshold value (condition) is exceeded. If the threshold value (condition) is exceeded (S66, Yes), control channel switching information (control channel) (Repeater switching information) is generated (S67). Then, preparation for superimposing the control channel switching information on the transmission radio wave is made (S68), and the control channel switching information and the vacant line (vacant) communication channel repeater information are transmitted to each communication terminal (S69). Further, an instruction to switch the designated communication channel repeater to the control channel repeater is transmitted to the corresponding communication channel repeater (S70), and the control channel repeater is switched to the communication channel repeater function (S71). .
If it is determined in the process S66 that the threshold value (condition) has not been exceeded as a result of comparison between the transmission failure information and a preset threshold value (condition) (S66, No), Then, it is determined whether or not the statistical value of the number of retransmissions exceeds the threshold value. If the statistical value exceeds the threshold value (Yes in S72), the process proceeds to the above-described processing S67. If it is determined that the threshold value is not exceeded (S72) No), vacant line (vacant) communication channel repeater information is transmitted to the receiving / transmitting communication terminal (S73), and the process is terminated.

FIG. 6 is a flowchart showing a control example of the communication channel repeater in the repeater apparatus according to the present invention. In the process shown in this example, when the control channel repeater searches for an empty channel in response to a wireless relay request from the communication terminal, the communication channel frequency transmission information is received from the control channel repeater (S81), and the communication channel frequency ( Frame signal) is transmitted (S82). Since the communication terminal that has received the communication channel information transmits the information to be transmitted superimposed on the communication channel frequency signal, the communication terminal receives the signal (S83) and superimposes the data on the important point of the frame being transmitted ( (S84), the data is transmitted to the receiving terminal via the communication channel frequency (S85). When the communication is completed (S86), the flow ends.
FIG. 7 is a flowchart showing a control example of a communication repeater that switches from a communication channel repeater to a control channel repeater in the repeater apparatus according to the present invention. In this flow, although it is a communication channel repeater at that time, it is determined whether or not an instruction to switch to the control channel repeater has been received from the control channel repeater, and if there is an instruction (Yes in S87), the control channel repeater function (S88), and waits as a control channel repeater (S89).

As described above, the repeater device according to the present invention includes a control channel repeater and a communication channel repeater, and the control channel repeater does not establish transmission included in a signal transmitted from the calling communication terminal via the control channel. Control channel state detection means for recording information or / and transmission retransmission number information, means for comparing the recorded transmission failure information or / and transmission retransmission number information with preset threshold information, and the communication channel repeater in an empty state A communication channel vacant line detecting means for detecting whether or not there is, and when the recorded transmission failure information or / and transmission retransmission count information exceeds a threshold value, the vacant line communication channel repeater is switched to a control channel repeater. Control channel switching information generating means for generating the indicated information, and the generated control channel switching information is sent to the communication terminal. As well as, on the basis of the control channel switching information, and a repeater switching means for switching the corresponding communication channel repeater to the control channel repeater.
Therefore, even if a large interference wave exists at the frequency of the control channel repeater, if the communication channel repeater can communicate, it can function as a new control channel repeater to maintain a normal repeater function. Is possible.
As an example, in the case of a superheterodyne receiver, a radio wave transmitted from another wireless device that is not a target wave may be received depending on the image frequency, and may be affected by interference. The transmitted radio wave includes a direct wave propagating directly from the transmitting antenna to the receiving antenna and a reflected wave caused by obstacles such as buildings and walls, and is synthesized at the receiving point. At that time, due to the difference in the communication path, the intensity and phase difference (delay etc.) of each radio wave occurs at the reception point, and the electric field intensity at the reception varies (fading). In such a case, if the communication channel repeater is communicable, the normal repeater function can be maintained by causing it to function as a new control channel repeater.

8 to 11 show that the communication method of the repeater device or communication terminal to which the present invention is applied transmits and receives audio signal data from the communication terminal with a flag indicating that it is a communication channel in a required part of the frame. It is a flowchart which shows the example of control in the case of controlling as what is called a logical control channel or a logical communication channel.
In this embodiment, when a communication terminal accesses a repeater device via a control channel repeater and succeeds in accessing the repeater device, the control channel repeater is switched to the communication channel repeater. For example, when there is no empty channel in the communication channel repeater, or there is an empty channel, either the transmitting terminal or the receiving terminal has interference in the empty communication channel and communication is difficult. In this case, the control channel repeater is controlled to be used as a communication channel repeater. In this way, when normal communication is possible without interference or fading at least with respect to the control channel frequency, normal communication can be ensured by using the channel frequency as it is as a communication channel.
Note that whether or not to switch the control channel to be used as a communication channel depends on, for example, the transmission failure information transmitted from the communication terminal on the transmission side and / or the number of retransmissions as described with reference to FIGS. The repeater device side is configured to make a determination based on the information. However, the present invention is not limited to this example, and the repeater device side monitors the communication state of the control channel and other communication channels, and based on the monitoring result. Judgment may be made. In the following control flow, the control channel communication state detection process, the communication channel empty line detection process, and the like are omitted for the sake of simplicity.

FIG. 8 is a flowchart showing a control example of the repeater device according to the embodiment of the present invention. When an access request is received from the calling communication terminal (transmission terminal) via the control channel frequency (S90), the control channel repeater transmits information indicating that the logical control channel at that time is switched to the logical communication channel to each communication. While transmitting to a terminal (S91), this information is transmitted to the communication channel repeater which changes to a control channel repeater instead (S92). Thereafter, what has been functioning as a control channel repeater until then is caused to function as a communication channel repeater (S93). Further, the communication channel repeater that has been switched to the communication channel repeater until then starts transmission of the communication channel frequency signal (S94), receives the transmission radio wave from the transmission terminal (S95), and receives the received signal. The data to be relayed is superimposed (placed) on the required part of the frame being transmitted (S96), and relayed transmission is performed to the receiving terminal (S98). After the communication is completed, it stands by as a communication channel repeater (S99).
FIG. 9 is a flowchart showing a control example of the calling communication terminal (transmission terminal). When the flow starts, the communication terminal performs random access to the repeater using the control channel frequency set at that time (S100), and determines whether there is a response from the repeater (from the control channel repeater) ( S101). When there is a response from the control channel repeater of the repeater (S101, Yes), when the switching information from the logical control channel included in the repeater to the logical communication channel is received (S102), the control channel repeater remains as the communication channel. Since it becomes a repeater, communication is performed via the communication channel repeater (S103). After the communication is completed (S104), channel information (frequency information) that newly becomes a control channel repeater is received (S105), and the frequency is set. Lock and wait for reception (S106).

FIG. 10 is a flowchart showing an example of processing of the receiving terminal and the standby terminal. During standby / reception on the control channel (or logical control channel) (S110), it is determined whether or not the communication area (service area) is out (S111), and if it is determined that it is within the range (S111, No) ), Waiting for the arrival of the control channel frequency signal (S112), and if the received signal from the control channel repeater includes information for switching from the logical control channel to the logical communication channel (S113), any communication Waiting for reception of information indicating whether the channel repeater is switched to the control channel repeater (S114). At this time, since the signal indicating the receiving terminal is included in the received signal from the repeater, it is determined whether or not the own communication terminal is the terminal that has received the call, and if the own terminal is the receiving terminal (S115, Yes), since the control channel repeater so far becomes a communication channel repeater, communication with the transmitting terminal is performed using the channel signal frequency as it is (S116), and after the communication ends (S117), new control channel repeater information Is acquired and locked (S118). If it is determined in step S111 that the communication area of the previous repeater is out (S111, Yes), a new control channel frequency is searched (S119) and locked to the new control channel frequency (S118). ). If it is determined in step S115 that the terminal is not the receiving terminal (S115, No), the terminal locks to a new control channel frequency and waits for reception (S118).
FIG. 11 is a flowchart showing a control example of the communication channel repeater in the repeater apparatus of the present invention. When information indicating switching to the control channel repeater is received from the control channel repeater while functioning as a communication channel repeater (S120, Yes), the control channel repeater is switched (S121), and thereafter the control channel repeater is used as the control channel repeater. The function is started, and information such as the control channel frequency is transmitted to each communication terminal (S122).

In the embodiments described above, the control channel repeater is shown as a logical control channel and the communication channel repeater is shown as a logical communication channel. However, the present invention is not limited to these examples, and control is performed in each communication method. By considering what functions as a channel and a communication channel as a control channel repeater and a communication channel repeater in the above description, the present invention can be widely applied to repeater devices and communication terminals of various communication systems.
The present invention can be variously modified in addition to the embodiments described above. For example, the case where the transmission / reception frequencies of the control channel repeater and the communication channel repeater are mounted as a unit set in advance so as to function as the respective repeaters has been shown. Each unit may have a frequency variable function and may be switched and used so that it can function as a control channel repeater or a communication channel repeater as necessary.
Further, as the control channel state detection means to be recorded in the communication terminal, information indicating communication states other than transmission failure information and transmission retransmission number information, for example, communication quality such as data error correction rate and SN (signal-to-noise ratio) It may be evaluation information.
Furthermore, the present invention can be applied to either a press talk (simplex) system in which transmission / reception is alternately repeated or a simultaneous transmission / reception (duplex) system.

In addition, the invention related to a repeater device that automatically connects a communication line in response to a request from a calling side communication terminal described in Patent Document 1 proposed by the same applicant, or an empty line (available space) disclosed in Patent Document 2 ) A means for automatically searching for a channel and notifying idle channel channel information when calling from a calling communication terminal can be used as a repeater configuration or a communication terminal configuration when implementing the present invention. .
In the above-described embodiment, an example in which two repeater units are provided as a repeater device has been described. However, by providing a plurality of repeater units, it is also possible to configure a multi-system relay simultaneously.
In addition, although explanation about the realization of each control means has been omitted, by providing a CPU or DSP, processing for determining the presence / absence of a received signal and decoding various codes included in the signal can be realized with existing technology. Therefore, detailed description is omitted. Further, the repeater device of the above-described embodiment and the control processing of the communication terminal are programmed, written in a recording medium such as a CD-ROM in advance, and the medium driving device such as a CD-ROM drive installed in a computer It goes without saying that it is possible to achieve the object of the present invention by mounting a CD-ROM or the like and storing and executing these programs in a memory or storage device of a computer. Will.

1 is a block diagram showing a schematic configuration of a repeater device according to the present invention. The flowchart which shows the example of control of the communication terminal (transmission terminal) which concerns on this invention. The flowchart which shows the example of control of the communication terminal (reception terminal) which concerns on this invention. The flowchart which shows the example of control of the communication terminal (standby terminal) which concerns on this invention. The flowchart which shows the example of control of the repeater apparatus which concerns on this invention. The flowchart which shows the example of control of the repeater apparatus which concerns on this invention. The flowchart which shows the example of control of the repeater apparatus which concerns on this invention. The flowchart which shows the example of control of the repeater apparatus which concerns on this invention. The flowchart which shows the example of control of the communication terminal (transmission terminal) which concerns on this invention. The flowchart which shows the example of control of the communication terminal (standby terminal and receiving terminal) which concerns on this invention. The flowchart which shows the example of control of the repeater apparatus which concerns on this invention. The block diagram which shows the schematic structure of the conventional repeater apparatus.

Explanation of symbols

  1 repeater device, 2 control channel repeater, 3, 4 communication channel repeater, 5, 6 antenna, 7 to 9 communication terminal

Claims (4)

  In a repeater apparatus that includes a control channel repeater and a plurality of communication channel repeaters and performs wireless relay between communication terminals, transmission failure information or / and transmission included in a signal transmitted from the calling communication terminal via the control channel Control channel state detection means for recording retransmission number information, means for comparing the recorded transmission failure information or / and transmission retransmission number information with preset threshold information, and whether the communication channel repeater is in an idle state Information indicating that the communication channel repeater in the idle state is switched to the control channel repeater when the recorded transmission failure information or / and transmission retransmission count information exceeds a threshold. Control channel switching information generating means to be generated and transmitting the generated control channel switching information to the communication terminal Both based on the control channel switching information, repeater apparatus comprising the repeater switching means for switching the corresponding communication channel repeater to the control channel repeater.   The repeater device according to claim 1, wherein the communication channel repeater is configured to function as a control channel repeater when receiving an instruction to switch to a control channel repeater from the repeater switching means.   The communication channel repeater and the control channel repeater transmit frame signals continuously or as necessary, and a required control information or audio signal with a flag indicating that it is a control channel or a communication channel at a required position. Is controlled as a logical control channel or a logical communication channel that arranges and transmits data including the data, and the control channel repeater and the communication channel repeater are switched by switching the logical control channel and the logical communication channel to each other. The repeater device according to claim 1, wherein the repeater device is configured. A communication terminal that communicates with another communication terminal via the repeater device according to any one of claims 1 to 3 ,
Means for recording transmission failure information or / and transmission retransmission count information indicating that the repeater device has not responded when a call is made to the repeater device, and a transmission signal for the repeater device, When receiving transmission channel failure information, or means for adding transmission retransmission count information, and control channel switching information indicating that a channel frequency other than the currently used control channel is switched to the control channel from the repeater device, A communication terminal comprising control means for communicating with a designated channel as a control channel.

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