Wireless communication network system and wireless communication device

Abstract

To allow a terminal to automatically return to a network (NW) if the terminal becomes strayed due to channels in use in the NW being changed in the simplex wireless communication network (NW) while some terminals are out of a service area or the like.SOLUTION: In a reception mode, each terminal cyclically scans all available channels, giving time priority to a currently set channel. When a channel in use in a network (NW) is changed, each terminal transmits and receives a G-ID (group identification signal) and a channel change request signal, and each terminal counts the number of times of its transmission and reception. At the time of a call, each terminal also additionally transmits its own count value, and in another terminal, if a receiving channel of the G-ID at cyclic scanning is other than the currently set channel, each terminal updates and stores the receiving channel and a count value (N), and compares its own count value (M) with the count value (N). In a case of M>N, the G-ID and M are transmitted on the currently set channel. In a case of N>M, its own currently set channel is changed to the receiving channel. In a case of M=N, the current state is maintained.SELECTED DRAWING: Figure 15A

Description

[Technical Field]

[0001] The present invention relates to a network system and a wireless communication device that, in a simplex group wireless communication network, when the communication channel is changed for reasons such as avoiding interference, some of the network's constituent terminals (wireless communication devices) may deviate from the changed channel for various reasons, but which makes it possible for such "deviated terminals" to automatically return to the network. [Background technology]

[0002] Simplex business radio communication devices are used outdoors at various construction sites such as building sites, and indoors at relatively large restaurants and spacious home improvement stores for business-related communication between employees. Furthermore, wireless communication devices that comply with the specified low-power standard are designed to communicate over short distances using the 400 MHz band, but as they are now widely used for a variety of business purposes, it is not uncommon for wireless zones to be close to each other or to overlap.

[0003] Non-Patent Document 1 below specifies the type of radio wave, communication method, operating frequency, and antenna power as technical conditions for the system related to the operation of the wireless communication device, and for the operating frequency when the communication method is simplex, 20 channels are allocated: 11 channels numbered CH20 to CH30, which are divided into 12.5 kHz intervals from 422.0500 to 422.1750 MHz, and 9 channels numbered CH41 to CH49, which are divided into 12.5 kHz intervals from 422.2000 to 422.3000 MHz. Channel number CH31 (422.1875 MHz) is also allocated as a frequency control channel, and can be used within a range of 0.5 seconds.

[0004] Therefore, when conducting group communication using the above-mentioned wireless communication device in a simplex system, an available channel is selected from the above-mentioned 20 channels or from a number of channels pre-selected from those. However, when the wireless zone becomes dense as mentioned above, interference may occur along the way, and if this causes disruption to business, it may be necessary to change the communication channel even while the network is in operation.

[0005] In this regard, many commercially available wireless communication devices have an automatic channel selection function. In the automatic channel selection mode, a specific wireless communication device in the network performing group communication functions as a transmitter, and the other wireless communication devices function as receivers. In the transmitting wireless communication device, if the receiving and demodulating unit performs carrier sensing and transmission is not possible, the process of moving one channel according to the channel number, etc. and performing carrier sensing is repeated until transmission is possible, and the device enters transmission mode on the channel where transmission is possible.Meanwhile, the receiving and demodulating unit of the wireless communication device constantly scans all channels, stops scanning and opens the audio playback circuit when it receives a signal with a matching group code, and resumes scanning once reception is complete.

[0006] Furthermore, the following technologies have been proposed in patent documents: Patent Document 1 listed below discloses a wireless communication network in which, when one wireless communication device in communication detects interference caused by unwanted radio waves, it searches for an available channel and creates a channel switching signal by attaching a switching signal to the detected available channel information; when it detects that the level of the unwanted radio waves on the channel in communication has dropped to a level where communication is possible, it transmits the channel switching signal and sets its own channel to the available channel specified in the channel switching signal; when the other wireless communication device in communication receives and detects the channel switching signal, it transmits a switching acknowledgement signal and switches to the channel specified in the channel switching signal; and other wireless communication devices in standby mode that are not in communication receive the switching acknowledgement signal and switch to the channel specified in the channel switching signal.

[0007] Patent Document 2 listed below discloses a system in which, in a wireless network consisting of slave stations that perform data communication and a master station that controls each slave station, the master station judges the radio wave conditions of all available wireless channels at the time of startup and determines the optimal channel (the master station transmits free channel information in a beacon), periodically suspends network transmission (the master station transmits a monitoring beacon that prohibits slave stations from transmitting for a certain period of time), and each slave station monitors the radio wave conditions in its vicinity in a dispersed manner (the slave stations that receive the monitoring beacon measure the received field strength during the transmission suspension period and transmit the results to the master station to notify them), thereby selecting the optimal channel for the wireless network (the master station selects the optimal channel based on the measurement results of the received field strength received from each slave station, and transmits the optimal channel information in a beacon to each slave station).

[0008] Furthermore, the applicant has proposed a wireless communication network system relating to the change of communication channels in a simplex group wireless communication network, in which, when one of the constituent terminals switches to transmission mode and carrier sense detects interference in the currently used channel, it scans all available channels in the network while in reception / standby mode, and uses channel selection ranking data created so that each available channel is arranged in ascending order of received signal strength, and performs carrier sense sequentially from the highest channel to the channel of a predetermined rank, and sets the first detected channel free of interference as the transmission / reception channel, and transmits a group identification code of the group network and a channel change command, while each constituent terminal other than the constituent terminal in reception / standby mode repeatedly scans all available channels in the group network, and if it receives and detects the group identification code of the group network and a channel change command from a channel determined to be in an interference state, the transmission / reception channel is changed to the channel determined to be in an interference state (Patent Application No. 2023-074015). [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 10-75194 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-158667 [Non-patent literature]

[0010] [Non-Patent Document 1] Association of Radio Industries and Businesses, "Specific Low-Power Radio Stations / Radio Equipment for Radio Telephones / Standard Specifications," RCR STD-20 Version 5.1, revised October 29, 2021 Summary of the Invention [Problem to be solved by the invention]

[0011] As mentioned above, various proposals have been made for methods of changing network channels in a group wireless communication network, but there may be terminals (wireless communication devices) that are unable to participate in the change process for reasons such as being out of range when the network channel is changed or not being powered on.Such terminals (hereinafter referred to as "stray terminals") are unable to transition to the new network channel after the change, and therefore are unable to communicate with other terminals in the group.

[0012] Furthermore, it is difficult for other wireless communication devices within the network to detect that a terminal has become disconnected from the network, and the disconnected terminal often cannot immediately confirm that it has become disconnected from the network. As a result, in the case of a network used for business purposes, inconvenient situations can arise, such as the inability to thoroughly communicate business matters.

[0013] Therefore, the present invention aims to provide a network system and a wireless communication device that is a constituent terminal of the network system, in which even if a stray terminal occurs in a simplex group wireless communication network, the stray terminal can be automatically transferred to a changed communication channel and returned to the network when a call transmission event or an automatic information transmission event under certain conditions is triggered. [Means for solving the problem]

[0014] <<First Invention>> This invention relates to a group wireless communication network system in which a wireless communication device, which is a terminal of a common configuration in a simplex group wireless communication network, comprises a modulation / transmission unit and a reception / demodulation unit that cyclically scans all channels available in the network, and in which one terminal transmits a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CCR") on a designated change destination channel, while another terminal receives the G-ID and the CCR (hereinafter both signals are collectively referred to as "G-ID·CCR") during the scanning stage of the designated change destination channel by the reception / demodulation unit, thereby changing the network channel. In this group wireless communication network system, each terminal in the network has a function A that counts the number of times the G-ID·CCR has been sent and received in an incremental manner and updates and stores the count value information, a function B that, in a transmission mode, sends the G-ID and a call signal together with the count value information of its own device, which has been updated and stored by function A, over a currently set channel that is the channel used in the previous communication, and a function C that, in a reception mode, sends a signal including the G-ID during the scanning stage of the currently set channel, thereby updating and storing the count value information of the own terminal. In the case where the cyclic scanning is temporarily stopped on the channel, the call signal is received and demodulated to play back the voice, and when a signal including the G-ID is received and demodulated during the scanning stage of an available channel other than the currently set channel, the cyclic scanning is temporarily stopped on the channel, and the count value information of the transmitting terminal included in the demodulated signal is detected and updated and stored together with the received channel information, with function C; and each time the information is updated and stored by function C, the count value information of the own terminal updated and stored (M times) by function A is compared with the count value information of the own terminal updated and stored by function C. and a function E which, when M>N as a result of the comparison by said function D, automatically sets the transmission mode of said currently set channel and transmits said G-ID and said own count value information (M times), and when N>M, changes said currently set channel to a channel indicated by the receiving channel information updated and stored by said function C, and rewrites said own count value information (M times) to said count value information (N times) at said source terminal, and when M=N, does nothing and maintains the current state.The present invention relates to a group wireless communication network system, characterized in that each terminal in the network executes the function A, and when one terminal executes the function B, the other terminal executes the functions C, D, and E, and when M>N in the execution of the function D, the other terminal transmits information using the function E, and the one terminal executes the functions C, D, and E.

[0015] This invention relates to a system in which each terminal (wireless communication device) that makes up a simplex group wireless communication network has common functions, and even if a terminal deviates from the network channel, the functions of each terminal work together while communication is being carried out, allowing it to return to the network. Each terminal that makes up the network is equipped with a modulation transmission unit and a reception / demodulation unit as a transmission / reception unit, and in reception mode, the reception / demodulation unit cyclically scans all channels available on the network.When a G-ID is detected and the call signal is reproduced, or when the required information is obtained and the corresponding processing is performed, the cyclic scanning is stopped.

[0016] In the network of this invention, if interference occurs on the network channel currently in use, one terminal transmits the G-ID·CCR on another available channel, while the other terminal receives and demodulates it during the cyclic scanning process of its receiving and demodulating section, and changes its own transmitting and receiving channel to the channel on which the G-ID·CCR was received, thereby changing the network channel. Then, in each terminal of the network, function A detects each time a G-ID·CCR is transmitted / received, counts the number of transmissions / receptions in a sequential increment manner, and updates and stores the count value information.

[0017] In this network, when a terminal enters transmission mode for a call, it uses function B to transmit its own count value information along with the G-ID and call signal on the currently set channel (the channel used in the previous communication), thereby transmitting its own count value information to other terminals. On the other hand, in each other terminal in the receiving mode, when the receiving and demodulating unit receives and demodulates the G-ID during the cyclic scanning stage of the currently set channel, function C stops the cyclic scanning on that channel, receives and demodulates the call signal to play the audio, and when the G-ID is received during the cyclic scanning stage of a channel other than the currently set channel, it similarly stops the cyclic scanning, detects the count value information at the sending terminal from the demodulated signal, and updates and stores it together with the receiving channel information.

[0018] Here, when the G-ID is received and demodulated on the currently set channel, this corresponds to a state in which the communication channel between the own terminal and the sending terminal is a network channel, or when both terminals are deviated terminals and are on the same communication channel, but this invention is not concerned with these states, and each of the other terminals simply reproduces the speech signal demodulated by the receiving and demodulating unit. On the other hand, if the G-ID is received and demodulated on a channel other than the currently set channel, this corresponds to a situation where either the own terminal or the sending terminal is a stray terminal, or both are stray terminals on different communication channels. The present invention takes this situation into account and implements an algorithm to return the stray terminal to the network channel.

[0019] First, function C is used to update and store the count value information of one terminal on the other terminal side, and function D is used to compare the count value information of the other terminal (M times) with the count value information of the one terminal (N times) that has been updated and stored. In this case, the longer a terminal remains within the network, the larger the count value associated with the change in network channel will be; conversely, if the terminal deviates from the network channel for a period of time, it will not be able to be present when the network channel changes, and the count value will tend to be smaller; and terminals that remain within the network without deviating will naturally have the largest count value. Therefore, it can be said that the larger the count value updated and stored in the terminal, the higher the estimated probability that the currently set channel is set as the network channel, and conversely, the lower the estimated probability that the terminal is a deviated terminal.

[0020] In this invention, this situation is utilized rationally, and function E causes other terminals to execute the following corresponding processing procedure based on the comparison result between M and N. If M>N, the other terminal has a higher estimated probability of being set to the current network channel than the first terminal, so the other terminal reverses the transmission / reception in order to change the set channel of the first terminal to its own channel, and the other terminal transmits the G-ID and count value information (M times) on its own currently set channel. The information transmitted from other terminals is received and demodulated during the scanning process of the receiving and demodulating section of each terminal in the network, but then, conversely, one terminal that is the receiving terminal compares its own count value information (N times) with the demodulated count value information (M times) based on functions C and D. In this case, from the perspective of one terminal, the relationship between N and M is reversed in the corresponding process for the case where N>M described below, and the transmission and reception channel of one terminal is changed to the channel of the other terminal, and the count value information (N times) of one terminal is also rewritten to the count value information (M times) of the other terminal. Therefore, if one terminal is a stray terminal and the transmitting / receiving unit of the other terminal is a network channel, the transmitting / receiving unit of the one terminal is changed to the network channel and can return to the network, and if both terminals are stray terminals, the count value information of the own terminal is adjusted to the setting channel and count value information of the larger terminal. From the network perspective, this means that multiple other terminals will send responses at the same time, but if carrier sensing is required, only the terminal that is first enabled to send will be able to send a response.

[0021] When N>M, the opposite of the above, is that the first terminal has a higher estimated probability of being set to the network channel than the other terminals, so the other terminals change their own sending and receiving channels to the receiving channel (currently set channel on the first terminal side) updated and stored using function C, and also rewrite their own count value information (M times) to the count value information on the first terminal side (N times), thereby formally putting their own devices in the same history state as the first terminal. That is, if the currently set channel of one terminal is in a network channel setting state and another terminal is in a deviated terminal state, the communication channel of the other terminal is changed to the network channel, allowing it to return to the network, and the count value information is also formally aligned with that of the terminal that remained within the network.

[0022] In the case of N=M, this corresponds to the case where the currently set channels of one terminal and another terminal are both network channels, or where one terminal and another terminal happen to be in a deviated state and the number of times G-ID·CCR is sent and received is the same. In the former case, there is no need to intervene, and in the latter case, there is no way to resolve the deviated terminal state, and there is no choice but to wait for an opportunity to communicate with a terminal that is not in a deviated state. In the end, no response processing is performed and the status quo is maintained.

[0023] Assuming the functions possessed by the constituent terminals of the above network, while each terminal is executing function A, when one terminal executes function B, the other terminal executes functions C, D, and E, and when the execution of function D at this time becomes M>N, the other terminal sends information using function E, and one terminal executes functions C, D, and E. As the call communication is carried out, the communication channel of each terminal is always aligned with the currently set channel of the terminal with the larger count value information that is updated and stored, so that stray terminals that tend to have smaller count value information can inevitably return to the network channel.

[0024] It is desirable that the transmission of the count value information of the own device in function B of each terminal in the network is performed in a manner that the count value information is added to the end of the audio signal portion of the communication frame. This is because mixing an information signal into an audio signal causes distortion in the reproduced sound, making it difficult to hear. For example, this problem can be avoided by adding and transmitting count value information when the PTT button is turned off, and then transmitting a communication end signal.

[0025] Furthermore, with regard to the method of cyclic scanning of all channels available in the network by the receiving and demodulating unit, it is desirable to set the scanning time for the currently set channel in the wireless communication device longer than the scanning time for each of the other channels, and in particular, it is reasonable and preferable to use a method in which the currently set channel and one other channel are scanned alternately for the same amount of time, and different channels are selected sequentially for the one other channel. In the above-mentioned network, it is normal for terminals to be communicating with each other using the network channel as the currently set channel, and it is rather rare for a stray terminal to occur, so this is to ensure that the transition to the former normal communication state is carried out with priority.

[0026] The wireless communication device applicable to the group wireless communication network system according to the first aspect of the present invention can be configured as follows. As a terminal having a common configuration in a simplex group wireless communication network, the terminal comprises a modulation / transmission unit and a reception / demodulation unit that cyclically scans all channels available in the network, and transmits a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CCR") from the modulation / transmission unit on a designated change destination channel, while receiving the G-ID and the CCR (hereinafter both signals are collectively referred to as "G-ID·CCR") transmitted from another terminal on a designated change destination channel during the cyclic scanning process of the reception / demodulation unit, thereby enabling a change of network channel. a count storage means for counting the number of times the G-ID·CCR is transmitted and received in an incremental manner and updating and storing the count value information; an information transmission means for transmitting, in a transmission mode, the G-ID and a call signal together with the count value information of the own device that has been updated and stored by the count storage means on a currently set channel that is the channel used in the previous communication; and, in a reception mode, when a signal including the G-ID is received and demodulated during scanning of the currently set channel, temporarily stopping the cyclic scanning on the same channel and transmitting the call signal. and a call reproduction means for receiving and demodulating the G-ID and reproducing the voice; an information detection means for detecting, when a signal including the G-ID is received and demodulated in a stage of scanning an available channel other than the currently set channel in a reception mode, count value information at the transmitting terminal included in the demodulated signal together with the reception channel information, with the cyclic scanning temporarily stopped on the channel; an information storage means for updating and storing the reception channel information and count value information detected by the information detection means; and an information storage means for updating and storing the count value information of the own terminal each time the information storage means updates and stores the information. a comparison means for comparing the count value information (M times) of the count value information (N times) at the source terminal updated and stored by the information storage means, and if the result of the comparison by the comparison means is M>N, automatically set the transmission mode of the currently set channel to transmit the G-ID and the count value information (M times) of the count storage means, and if N>M, change the currently set channel to a channel indicated by the receiving channel information of the information storage means, and rewrite the count value information (M times) of the count storage means to the count value information (N times) of the information storage means, and if M=N,and a corresponding processing means for maintaining the current state without executing any action.

[0027] <<Second Invention>> This invention relates to a group wireless communication network system in which a wireless communication device, which is a terminal of a common configuration in a simplex group wireless communication network, comprises a modulation / transmission unit and a reception / demodulation unit that cyclically scans all channels available in the network, and in which one terminal transmits a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CCR") on a designated change destination channel, while another terminal receives the G-ID and the CCR (hereinafter both signals are collectively referred to as "G-ID·CCR") during the scanning stage of the designated change destination channel by the reception / demodulation unit, thereby changing the network channel. In this group wireless communication network system, each terminal in the network has a function A that updates and stores detection time information when transmission / reception of the G-ID·CCR is detected, a function B that, in a transmission mode, transmits the G-ID and call signal together with the detection time information of the terminal that has been updated and stored by function A over a currently set channel that is the channel used in the previous communication, and a function C that, in a reception mode, temporarily stops the cyclic scanning on the currently set channel when a signal including the G-ID is received and demodulated during the scanning stage of the currently set channel. In this state, the call signal is received and demodulated to play back the voice, and when a signal including the G-ID is received and demodulated in the scanning stage of an available channel other than the currently set channel, the cyclic scanning is temporarily stopped on the same channel, and in this state, the detection time information at the sending terminal included in the demodulated signal is detected and stored as an update together with the receiving channel information; function C, which compares the detection time information (T1) of the own terminal updated and stored by function A with the detection time information (T2) at the sending terminal updated and stored by function C every time information is updated and stored by function C; and a function E which, if the result of the comparison by the function D is that T1 is later than T2, automatically sets the transmission mode of the currently set channel and transmits the G-ID and the detection time information (T1) of the own device, and if T2 is later than T1, changes the currently set channel to the channel indicated by the reception channel information updated and stored by the function C, and rewrites the detection time information (T1) of the own device to the detection time information (T2) of the transmission source terminal, and if T1 and T2 are simultaneous, does nothing and maintains the current state, and each terminal of the network is executing the function A,The present invention relates to a group wireless communication network system characterized in that when one terminal executes function B, another terminal executes functions C, D, and E, and when T1 is later than T2 in the execution of function D, the other terminal transmits information using function E, and the one terminal executes functions C, D, and E.

[0028] Like the first invention, this invention also relates to a system in which each terminal (wireless communication device) constituting a simplex group wireless communication network has common functions, and even if a terminal deviates from the network channel, the functions of each terminal work together to return it to the network while communication is being carried out.Each terminal has a modulation transmission unit and a reception / demodulation unit as a transmission / reception unit, and in reception mode, the reception / demodulation unit cyclically scans all channels available on the network, and the cyclic scanning is stopped when a G-ID is detected and the call signal is reproduced, or when required information is obtained and corresponding processing is performed.

[0029] Furthermore, in the network of this invention, as in the first invention, if interference occurs on the network channel currently in use, one terminal transmits the G-ID·CCR on another available channel, while the other terminal receives and demodulates it during the cyclic scanning process of the receiving and demodulating section, and changes its own transmitting and receiving channel to the channel on which the G-ID·CCR was received, thereby changing the network channel. Then, each terminal in the network uses function A to detect every transmission / reception of G-ID·CCR, and updates and stores the detection time information.

[0030] In this invention, when a terminal enters transmission mode for a call using function B, it transmits the G-ID and call signal together with its own detection time information on the currently set channel (the channel used in the previous communication), and transmits the detection time information of its own terminal to other terminals. On the other hand, in other terminals in the receiving mode, when the receiving and demodulating unit receives and demodulates the G-ID during the cyclic scanning stage of the currently set channel, function C stops the cyclic scanning on that channel, receives and demodulates the call signal, and plays back the audio; when the G-ID is received during the cyclic scanning stage of a channel other than the currently set channel, function C similarly stops the cyclic scanning, detects the detection time information of the one terminal from the demodulated signal, and updates and stores it together with the receiving channel information.

[0031] Here, when the G-ID is received and demodulated on the currently set channel, this corresponds to a state in which the currently set channel of one terminal and another terminal is a network channel, or when both terminals are deviated terminals and are on the same currently set channel, but this invention is not concerned with these states, and the other terminal simply reproduces the speech signal demodulated by the receiving and demodulating unit. On the other hand, if the G-ID is received and demodulated on a channel other than the currently set channel, this corresponds to a situation where either the other terminal or the one terminal is a stray terminal, or both are stray terminals on different communication channels. The present invention takes this situation into account and implements an algorithm to return the stray terminal to the network channel.

[0032] First, function C is used to update and store the detection time information of one terminal at the other terminal, and function D is used to compare the detection time information (T1) at the other terminal with the updated and stored detection time information (T2) at the one terminal. In this case, the later in time a terminal is in the network when the network channel is changed, the higher the estimated probability that it is set to the current network channel, and conversely, the lower the estimated probability that it is a deviating terminal.

[0033] In this invention, this situation is utilized rationally, and function E causes the other terminal to execute the following corresponding processing procedure based on the comparison result between T1 and T2. If T1 is later than T2, the other terminal has a higher estimated probability of being set on the network channel than the first terminal, so the other terminal transmits its G-ID and its own detection time information (T1) on its own currently set channel in order to change the currently set channel of the first terminal to its own currently set channel. The information transmitted from other terminals is received and demodulated during the scanning process of the receiving and demodulating section of each terminal in the network, but in turn, one terminal that is the receiving terminal will compare its own detection time information (T2) with the received and demodulated detection time information (T1) based on functions C and D. In this case, from the perspective of the first terminal, the detection time information (T1) of the other terminal received and demodulated will be later than the detection time information (T2) of the first terminal, so in the corresponding processing when T2 is later than T1 described below, the relationship between T2 and T1 will be reversed, and the currently set channel of the first terminal will be changed to the currently set channel of the other terminal, and the detection time information (T2) of the first terminal will also be rewritten to the detection time information (T1) of the other terminal. Therefore, if one terminal is a stray terminal and the communication channel of the other terminal is a network channel, the transmitter / receiver of the one terminal will be changed to the network channel and it will be able to return to the network, and if both terminals are stray terminals, the time indicated by the detection time information will be aligned with the communication channel and detection time information of the later terminal. From the network perspective, it is possible that multiple other terminals may send responses at the same time, but when carrier sensing is required, only the terminal that is first enabled to send can send a response.

[0034] If T2 is later than T1, then, conversely to the above, the estimated probability that the first terminal is set to the network channel is higher than the other terminals, so the other terminals change their own communication channel to the receiving channel (currently set channel on the first terminal side) that has been updated and stored using function C, and at the same time rewrite their own detection time information (T1) to the detection time information (T2) on the first terminal side, thereby formally putting their own device in the same history state as the first terminal. That is, if the currently set channel of one terminal is in a network channel setting state and another terminal is in a deviated terminal state, the communication channel of the other terminal is changed to the network channel, allowing it to return to the network, and the detection time information is also formally aligned with that of the terminal that remained within the network.

[0035] When T1 and T2 are simultaneous, this corresponds to the case where the currently set channels of one terminal and the other terminal are both network channels, or where one terminal and the other terminal happen to be in a deviated state and the last detection times of the G-ID and CCR are simultaneous. In the former case, there is no need to intervene, and in the latter case, there is no way to resolve the deviated terminal state, and there is no choice but to wait for an opportunity to communicate with a terminal that is not in a deviated state. In the end, no response processing is performed and the status quo is maintained.

[0036] Assuming the functions possessed by the constituent terminals of the above network, while each terminal is executing function A, when one terminal executes function B, the other terminal executes functions C, D, and E, and when T1 is later than T2 in the execution of function D, the other terminal sends information using function E, and one terminal executes functions C, D, and E. As the call communication is carried out, the communication channel of each terminal is always aligned with the currently set channel of the terminal whose updated and stored detection time information indicates a later time, so that the stray terminal whose detection time information tends to indicate a later time will inevitably be able to return to the network channel.

[0037] It is desirable that the detection time information of the own device in function B of each terminal in the network is transmitted in a manner that adds it to the end of the audio signal portion of the communication frame. This is because mixing an information signal into an audio signal causes distortion in the reproduced sound, making it difficult to hear. For example, this problem can be avoided by adding and transmitting count value information when the PTT button is turned off, and then transmitting a communication end signal.

[0038] Furthermore, with regard to the method of cyclic scanning of all channels available in the network by the receiving and demodulating unit, it is desirable to set the scanning time for the currently set channel in the wireless communication device longer than the scanning time for each of the other channels, and in particular, it is reasonable and preferable to use a method in which the currently set channel and one other channel are scanned alternately for the same amount of time, and different channels are selected sequentially for the one other channel. In the above-mentioned network, it is normal for terminals to be communicating with each other using the network channel as the currently set channel, and it is rather rare for a stray terminal to occur, so this is to ensure that the transition to the former normal communication state is carried out with priority.

[0039] The wireless communication device applicable to the group wireless communication network system according to the second aspect of the present invention can be configured as follows. A wireless communication device as a common terminal in a simplex group wireless communication network comprises a modulation / transmission unit and a reception / demodulation unit that cyclically scans all channels available in the network, and transmits a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CCR") from the modulation / transmission unit on a designated change destination channel, while enabling a change of network channel by receiving the G-ID and the CCR (hereinafter both signals are collectively referred to as "G-ID·CCR") transmitted from another terminal on the designated change destination channel during the cyclic scanning of the reception / demodulation unit, the wireless communication device comprising: time storage means that updates and stores detection time information when transmission / reception of the G-ID·CCR is detected; information transmission means that, in a transmission mode, transmits the G-ID and a call signal together with its own detection time information that has been updated and stored in the time storage means on a currently set channel that is the channel used in the previous communication; and, in a reception mode, when a signal including the G-ID is received and demodulated during scanning of the currently set channel, receives and demodulates the call signal on the same channel with the cyclic scanning temporarily stopped, and plays back audio. A call reproduction means, an information detection means for detecting, when a signal including the G-ID is received and demodulated in a stage of scanning an available channel other than the currently set channel in a reception mode, detection time information at the source terminal included in the demodulated signal together with the reception channel information, with the cyclic scanning temporarily stopped on the channel, an information storage means for updating and storing the reception channel information and detection time information detected by the information detection means, and a time storage means for updating and storing the detection time information (T1) at the own terminal updated and stored in the time storage means every time the information storage means updates and stores the information. a comparison means for comparing detected time information (T2) at the source terminal which is updated and stored in the information storage means, and if the result of the comparison by the comparison means shows that T1 is later than T2, automatically set the transmission mode of the currently set channel and transmit the G-ID and the detected time information (T1) of the time storage means, and if T2 is later than T1, change the currently set channel to the channel indicated by the receiving channel information of the information storage means, and rewrite the detected time information (T1) of the time storage means to the detected time information (T2) of the information storage means, and if T1 and T2 are simultaneous,and a corresponding processing means for maintaining the current state without executing any action.

[0040] <<Third Invention>> The present invention relates to a group wireless communication network system in which a wireless communication device, which is a terminal of a common configuration in a simplex group wireless communication network, comprises a modulation / transmission unit and a reception / demodulation unit which cyclically scans a frequency control channel and all channels available in the network, and in which one terminal transmits a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CH-CCR") with a destination channel designation on the frequency control channel, while another terminal receives the G-ID and the CH-CCR (hereinafter both signals are collectively referred to as "G-ID·CH-CCR") during the scanning stage of the frequency control channel by the reception / demodulation unit, thereby changing the network channel. In this group wireless communication network system, each terminal in the network has a function A which counts the number of transmissions and receptions of the G-ID·CH-CCR in an incremental manner and updates and stores the count value information, a function B which sets a normal transmission mode by a predetermined instruction operation and transmits the G-ID and a speech signal, and a function C which, in a reception mode, temporarily switches to the normal transmission mode when the reception / demodulation unit does not detect a reception / demodulation signal including the G-ID for a predetermined time. Modulated Transmission The transmission mode is automatically set by switching the G-ID and the currently set channel from the currently set channel, which is the channel used in the previous communication (excluding the frequency control channel), to the frequency control channel. relating to information (Hereinafter referred to as "current setting channel information")and function C for transmitting the count value information of the own terminal updated and stored by function A; and function D for, in a receiving mode, when the receiving and demodulating unit receives and demodulates a signal including the G-ID on the currently set channel, receiving and demodulating a call signal and reproducing audio with the cyclic scanning on the same channel temporarily stopped, and when the receiving and demodulating unit receives and demodulates a signal including the G-ID on the frequency control channel, detecting and updating the currently set channel information and count value information of the transmitting terminal contained in the demodulated signal with the cyclic scanning on the same channel temporarily stopped; and function E for, each time the information is updated and stored by function D, comparing the count value information (M times) of the own terminal updated and stored by function A with the count value information (N times) of the transmitting terminal updated and stored by function D; and, when the result of the comparison by function E is M>N, temporarily stopping the modulation and transmission unit. and a function F for automatically setting a transmission mode changed from the currently set channel to the frequency control channel, and transmitting the G-ID, the currently set channel information of the own device, and count value information (M times), and when N>M, changing the currently set channel of the own device to the currently set channel of the source terminal, and rewriting the count value information (M times) of the own device to the count value information (N times) of the source terminal, and when M=N, performing nothing and maintaining the current state, wherein each terminal of the network executes the function A and also executes the function B as appropriate, and when any one terminal executes the function C, the other terminals execute the functions D, E, and F, and when M>N in the execution of the function E at that time, the one terminal executes the functions D, E, and F in response to the information transmission by the other terminal using function F.

[0041] Like the first and second inventions, this invention also has each terminal (wireless communication device) that makes up a simplex group wireless communication network equipped with common functions, and even if a terminal deviates from the network channel, the functions of each terminal work together to return it to the network while communication is being carried out. Each terminal that makes up the network is equipped with a modulation transmission unit and a reception / demodulation unit as a transmission / reception unit.In reception mode, the reception / demodulation unit cyclically scans all channels and frequency control channels available on the network, and stops cyclic scanning when a G-ID is detected and the call signal is reproduced, or when the required information is obtained and the corresponding processing is performed.

[0042] In the network of this invention, if interference occurs on the network channel currently in use, one terminal transmits the G-ID·CH-CCR on the frequency control channel, while the other terminal receives and demodulates it during the cyclic scanning process of its receiving and demodulating section, and changes its own transmitting and receiving channel to the channel specified in the CH-CCR, thereby changing the network channel. Then, in each terminal of the network, function A detects each time a G-ID·CH-CCR is transmitted / received, counts the number of transmissions / receptions in a sequential increment manner, and updates and stores the count value information.

[0043] On the other hand, each terminal transmits the G-ID and call signals using the currently set channel in the normal transmission mode based on the instruction operation of the PTT button, etc., using function B, but also transmits control information using the frequency control channel in the transmission mode by function C and function F. In the transmission mode of function C, if the reception demodulation unit does not detect a received demodulated signal of G-ID for a predetermined period of time in reception mode, that is, if there is no reception from other terminals in the group for a predetermined consecutive period of time and it is suspected that the terminal is in a deviated terminal state, it sets an automatic transmission mode in which the currently set channel is temporarily switched to the frequency control channel, and transmits the G-ID, currently set channel information, and the count value information (the number of times transmission and reception of G-ID·CH-CCR has been detected in the terminal) to communicate to other terminals. In this case, the "predetermined time" is determined as the period of no communication during which each terminal assumes that it may have become a stray terminal, and may be determined according to the frequency of communication on the network.

[0044] In the first and second inventions, the receiving and demodulating unit uses a communication channel scanning method, so that each time a call signal is transmitted, control information is added and transmitted to each terminal, but in this invention, the receiving and demodulating unit uses a method of scanning communication channels and frequency control channels, and control information is transmitted using a frequency control channel that is frequently used in specified low-power radio, so that the count value information is transmitted only under conditions where the occurrence of a stray terminal is predicted. In addition, the control information transmitted includes not only the G-ID and the count value information but also the currently set channel information of the own terminal. This is because, in the first and second inventions, the control information is transmitted on the currently set channel, so the currently set channel of the transmitting terminal can be confirmed from the receiving channel, whereas in this invention, the control information is transmitted on the frequency control channel, so it is necessary to specifically indicate the currently set channel as information.

[0045] Function D relates to the function in the receive mode. If the receiving and demodulating unit receives and demodulates a signal containing a G-ID on the currently set channel during the cyclic scanning process, the sending terminal is a terminal that belongs to a group and has the same currently set channel as the sending terminal itself, and the receiving terminal is receiving a call signal that was sent by the sending terminal using function B, so regardless of whether the currently set channel is a network channel or not, the receiving and demodulating unit will reproduce the demodulated call signal. On the other hand, if one terminal does not detect a received demodulated signal of the G-ID for a predetermined period of time and transmits the G-ID, its own currently set channel information, and count value information on the frequency control channel using function C, the receiving and demodulating unit of another terminal will receive and demodulate these control signals during the cyclic scanning of the frequency control channel using function D, and update and store them. Therefore, the other terminal (receiving terminal) will have its own count value information (M) updated and stored using function A and the count value information (N) of one terminal (sending terminal) updated and stored using function D, and these count value information will be compared using function E.

[0046] In this case, the longer a terminal remains within the network, the larger the count value associated with the change in network channel will be; conversely, the longer the terminal deviates from the network channel, the smaller the count value will be because the terminal is not present when the network channel is changed. Since a terminal that has remained within the network without deviating will naturally store the largest count value information, it can be said that the larger the count value updated and stored by a terminal, the higher the estimated probability that its transmitter / receiver is set to the current network channel, and the lower the estimated probability that the terminal is a deviated terminal.

[0047] In the present invention, this situation is utilized rationally, and the corresponding processing by function F is executed based on the result of the comparison of the count value information by function E. When M>N, the other terminals have a higher probability of being set to the current network channel than the first terminal, so the other terminals temporarily change the channel set by the first terminal to their own channel. Modulated Transmission The automatic transmission mode is set by switching the unit from the currently set channel to the frequency control channel, and the G-ID, the currently set channel information of the own unit, and the count value information (M times) are transmitted. The transmitted information from other terminals is received and demodulated when the receiving and demodulating unit of each terminal in the network scans the frequency control channel, but one terminal compares its own count value information (N times) with the demodulated count value information (M times) based on functions D and E. In this case, from the perspective of the first terminal, the relationship between N and M is reversed in the corresponding processing for the case where N>M described below, and based on function F, the communication channel of the first terminal is changed to the currently set channel information of the other terminal, and the count value information (N times) on the first terminal is also rewritten to the count value information (M times) on the other terminal. Therefore, if one terminal is a stray terminal and the transmitting / receiving unit of the other terminal is a network channel, the transmitting / receiving unit of the one terminal is changed to the network channel and can return to the network, and if both terminals are stray terminals, the count value information of the own terminal is adjusted to the setting channel and count value information of the larger terminal. From the network perspective, this means that multiple other terminals will send responses at the same time, but if carrier sensing is required, only the terminal that is first enabled to send will be able to send a response.

[0048] When N>M, the opposite of the above, is that the estimated probability that one terminal is set to the network channel is higher than the other terminals, so the other terminals use the information they have received, demodulated, and updated to change their own transmission and reception channel to the currently set channel of the one terminal, and also rewrite their own count value information (M times) to the count value information of the one terminal (N times), thereby formally putting themselves in the same history state as the one terminal.

[0049] In the case of N=M, this corresponds to the case where the currently set channels of one terminal and another terminal are both network channels, or where one terminal and another terminal happen to be in a deviated state and the number of times G-ID·CH-CCR is sent and received is the same. In the former case, there is no need to intervene, and in the latter case, there is no way to resolve the deviated terminal state, so there is no choice but to wait for an opportunity to communicate with a terminal that is not in a deviated state, and ultimately, nothing is done as a response process.

[0050] Assuming the functions possessed by the constituent terminals of the above network, while each terminal is executing function A, when one terminal executes function B, the other terminal executes functions C, D, and E, and when the execution of function D at this time becomes M>N, the other terminal sends information using function E, and one terminal executes functions C, D, and E. As the call communication is carried out, the communication channel of each terminal is always aligned with the currently set channel of the terminal with the larger count value information that is updated and stored, so that stray terminals that tend to have smaller count value information can inevitably return to the network channel.

[0051] In function C of each terminal of the network, if the receiving and demodulating unit does not detect a receiving and demodulating signal including the G-ID for a predetermined period of time, it is desirable to also perform an operation of displaying on a display means that the terminal is likely to be in a deviated terminal state and / or an operation of notifying that the terminal is in the deviated terminal state by outputting a predetermined sound from an audio output means.

[0052] The wireless communication device applicable to the group wireless communication network system according to the third aspect of the present invention can be configured as follows. A wireless communication device as a terminal having a common configuration in a simplex group wireless communication network, comprising a modulation / transmission unit and a reception / demodulation unit which cyclically scans a frequency control channel and all channels available in the network, wherein the modulation / transmission unit transmits a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CH-CCR") which specifies a channel to change to on the frequency control channel, and the wireless communication device is capable of changing the network channel by receiving the G-ID and the CH-CCR (hereinafter both signals are collectively referred to as "G-ID·CH-CCR") transmitted on the frequency control channel from another terminal during the cyclic scanning process of the reception / demodulation unit, wherein the wireless communication device comprises: counting storage means which counts the number of transmissions and receptions of the G-ID·CH-CCR in an incremental manner and updates and stores the count value information; normal transmission means which sets a normal transmission mode in response to a predetermined instruction operation and transmits the G-ID and a call signal; and when the reception / demodulation unit does not detect a received demodulated signal including the G-ID for a predetermined time, the wireless communication device temporarily switches to the normal transmission mode. Modulated Transmission The transmission mode is automatically set by switching the G-ID and the currently set channel from the currently set channel, which is the channel used in the previous communication (excluding the frequency control channel), to the frequency control channel. relating to information (Hereinafter referred to as "current setting channel information")and a call reproduction means for receiving and demodulating a call signal and reproducing the voice when the reception demodulation unit receives and demodulates a signal including the G-ID on the currently set channel in a state where the cyclic scanning on the same channel is temporarily stopped in a reception mode; an information detection means for detecting currently set channel information and count value information at the transmission source terminal contained in the demodulated signal when the reception demodulation unit receives and demodulates a signal including the G-ID on the frequency control channel in a state where the cyclic scanning on the same channel is temporarily stopped in a reception mode; an information storage means for updating and storing the currently set channel information and count value information at the transmission source terminal detected by the information detection means; and a comparison means for comparing the count value information (M times) of the own terminal updated and stored in a count storage means with the count value information (N times) of the source terminal updated and stored in the information storage means; and a corresponding processing means for, if the result of the comparison by the comparison means is M>N, temporarily changing the modulation transmission unit to a transmission mode in which the modulation transmission unit is changed from a currently set channel to a frequency control channel and transmitting the G-ID, the currently set channel information, and the count value information (M times) of the count storage means, if N>M, changing the currently set channel to a channel indicated by the receiving channel information of the information storage means, and rewriting the count value information (M times) of the count storage means to the count value information (N times) of the information storage means, and, if M=N, performing nothing and maintaining the current state.

[0053] <<Fourth Invention>> A fourth invention is a group wireless communication network system in which a wireless communication device, which is a terminal of a common configuration in a simplex group wireless communication network, comprises a modulation / transmission unit and a reception / demodulation unit that cyclically scans a frequency control channel and all channels available in the network, and in which one terminal transmits a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CH-CCR") with a destination channel designation on the frequency control channel, while another terminal receives the G-ID and the CH-CCR (hereinafter both signals are collectively referred to as "G-ID·CH-CCR") during the scanning stage of the frequency control channel by the reception / demodulation unit, thereby changing the network channel. In this group wireless communication network system, each terminal in the network has a function A that updates and stores detection time information when transmission / reception of the G-ID·CH-CCR is detected, a function B that sets a normal transmission mode by a predetermined instruction operation and transmits the G-ID and a call signal, and a function C that temporarily switches to the normal transmission mode when the reception / demodulation unit does not detect a reception / demodulation signal including the G-ID for a predetermined time. Modulated Transmission The transmission mode is automatically set by switching the G-ID and the currently set channel from the currently set channel, which is the channel used in the previous communication (excluding the frequency control channel), to the frequency control channel. relating to information (Hereinafter referred to as "current setting channel information")a function C for transmitting the detected time information updated and stored by the function A and the detected time information updated and stored by the function A; a function D for, in a receive mode, when the reception / demodulation unit receives and demodulates a signal including the G-ID in the scanning stage of the currently set channel, receiving and demodulating a speech signal with the cyclic scanning temporarily stopped on the same channel to play back audio, and when the reception / demodulation unit receives and demodulates a signal including the G-ID in the scanning stage of the frequency control channel, detecting and updating the currently set channel information and count value information of the transmission source terminal contained in the demodulated signal with the cyclic scanning temporarily stopped on the same channel; a function E for, each time the information is updated and stored by the function D, comparing the detected time information (T1) of the own terminal updated and stored by the function A with the detected time information (T2) of the transmission source terminal updated and stored by the function D; and, when the comparison by the function E shows that T1 is later than T2, temporarily stopping the modulation / transmission unit from the currently set channel. and a function F for automatically setting a transmission mode changed from a set channel to the frequency control channel, transmitting the G-ID, currently set channel information of the own device, and detected time information (T1), and if T2 is later than T1, changing the currently set channel of the own device to the currently set channel of the source terminal, and rewriting the detected time information (T1) of the own device to the detected time information (T2) of the source terminal, and if T1 and T2 are simultaneous, maintaining the current state without executing anything, wherein each terminal of the network executes the function A and also executes the function B as appropriate, and when any one terminal executes the function C, the other terminals execute the functions D, E, and F, and when T1 is later than T2 during the execution of the function E, the one terminal executes the functions D, E, and F in response to information transmission by the other terminal using function F.

[0054] Like the first and second inventions, this invention also has each terminal (wireless communication device) that makes up a simplex group wireless communication network equipped with common functions, and even if a terminal deviates from the network channel, the functions of each terminal work together to return it to the network while communication is being carried out. Each terminal that makes up the network is equipped with a modulation transmission unit and a reception / demodulation unit as a transmission / reception unit.In reception mode, the reception / demodulation unit cyclically scans all channels and frequency control channels available on the network, and stops cyclic scanning when a G-ID is detected and the call signal is reproduced, or when the required information is obtained and the corresponding processing is performed.

[0055] In the network of this invention, if interference occurs on the network channel currently in use, one terminal transmits the G-ID·CH-CCR on the frequency control channel, while the other terminal receives and demodulates it during the cyclic scanning process of its receiving and demodulating section, and changes its own transmitting and receiving channel to the channel specified in the CH-CCR, thereby changing the network channel. Then, in each terminal of the network, function A detects every time a G-ID·CH-CCR is transmitted / received, and updates and stores the detection time information.

[0056] On the other hand, each terminal transmits the G-ID and call signals using the currently set channel in the normal transmission mode based on the instruction operation of the PTT button, etc., using function B, but also transmits control information using the frequency control channel in the transmission mode by function C and function F. In the transmission mode of function C, if the reception demodulation unit does not detect a received demodulated signal of the G-ID for a predetermined period of time in the reception mode, that is, if there is no reception from other terminals in the group for a predetermined consecutive period of time and it is suspected that the terminal is in a deviated terminal state, it sets an automatic transmission mode in which the currently set channel is temporarily switched to the frequency control channel, and transmits the G-ID, currently set channel information, and the detection time information (the time when the terminal detected transmission and reception of G-ID·CH-CCR in the terminal) to communicate to other terminals. In this case, the "predetermined time" is determined as the period of no communication during which each terminal assumes that it may have become a stray terminal, and may be determined according to the frequency of communication on the network.

[0057] In the first and second inventions, the receiving and demodulating unit uses a communication channel scanning method, so that each time a call signal is transmitted, control information is added and transmitted to each terminal, but in this invention, the receiving and demodulating unit uses a method of scanning communication channels and frequency control channels, and control information is transmitted using a frequency control channel that is frequently used in specified low-power radio, so that the detection time information is transmitted only under conditions where the occurrence of a stray terminal is predicted. In addition, the control information transmitted includes not only the G-ID and the detection time information but also the currently set channel information of the own terminal. This is because, in the first and second inventions, the control information is transmitted on the currently set channel, so the currently set channel of the transmitting terminal can be confirmed from the receiving channel, whereas in this invention, the control information is transmitted on the frequency control channel, so it is necessary to specifically indicate the currently set channel as information.

[0058] Function D relates to the function in the receive mode. If the receiving and demodulating unit receives and demodulates a signal containing a G-ID on the currently set channel during the cyclic scanning process, the sending terminal is a terminal that belongs to a group and has the same currently set channel as the sending terminal itself, and the receiving terminal is receiving a call signal that was sent by the sending terminal using function B, so regardless of whether the currently set channel is a network channel or not, the receiving and demodulating unit will reproduce the demodulated call signal. On the other hand, if one terminal does not detect a received demodulated signal of the G-ID for a predetermined period of time and transmits the G-ID, its own currently set channel information, and detection time information on the frequency control channel using function C, the receiving and demodulating unit of another terminal will receive and demodulate these control signals during the cyclic scanning of the frequency control channel using function D, and update and store them. Therefore, the other terminal will have its own detection time information (T1) updated and stored by function A and the detection time information (T2) of the other terminal updated and stored by function D, and these detection time information will be compared by function E.

[0059] In this case, the later in time a terminal is in the network when the network channel is changed, the higher the estimated probability that it is set to the current network channel, and conversely, the lower the estimated probability that it is a deviating terminal.

[0060] In this invention, this situation is utilized rationally, and the corresponding processing by function F is executed based on the result of the comparison of the detected time information by function E. If T1 is later than T2, the other terminal has a higher probability of being set to the current network channel than the first terminal, so the other terminal temporarily changes the setting channel of the first terminal to its own channel. Modulated Transmission The automatic transmission mode is set by switching the unit from the currently set channel to the frequency control channel, and the G-ID, the currently set channel information of the own unit, and the detection time information (T1) are transmitted. The information transmitted from other terminals is received and demodulated when the receiving and demodulating unit of each terminal in the network scans the frequency control channel, but one terminal compares its own detection time information (T2) with the demodulated detection time information (T1) based on functions D and E. In this case, from the perspective of the first terminal, the detection time information (T1) received and demodulated by the other terminal will be later than the detection time information (T2) of the first terminal, so in the corresponding processing when T2 is later than T1 described below, T2 and T1 will be in a reversed relationship, and based on function F, the communication channel of the first terminal will be changed to the currently set channel information of the other terminal, and the detection time information (T2) at the first terminal will also be rewritten to the detection time information (T1) at the other terminal. Therefore, if one terminal is a stray terminal and the transmitting / receiving unit of the other terminal is a network channel, the transmitting / receiving unit of the one terminal is changed to the network channel and can return to the network, and if both terminals are stray terminals, the detection time information of the own terminal is aligned with the setting channel and detection time information of the later terminal. From the network perspective, this means that multiple other terminals will send responses at the same time, but if carrier sensing is required, only the terminal that is first enabled to send will be able to send a response.

[0061] If T2 is later than T1, then, conversely to the above, the estimated probability that the first terminal is set to the network channel is higher than the other terminals, so the other terminal uses the information it has received, demodulated, and updated and stored to change its own communication channel to the currently set channel of the first terminal, and at the same time rewrites its own detection time information (T1) to the detection time information (T2) of the first terminal, thereby formally putting itself in the same history state as the first terminal.

[0062] When T1 and T2 occur simultaneously, this corresponds to the case where the currently set channels of the one terminal and the other terminal are both network channels, or the case where the one terminal and the other terminal happen to be in a deviated state and the detection time information of the G-ID·CH-CCR is the same. In the former case, there is no need to intervene, and in the latter case, there is no way to resolve the deviated terminal state, so there is no choice but to wait for an opportunity to communicate with a terminal that is not in a deviated state, and ultimately, no response processing is performed.

[0063] Assuming the functions possessed by the constituent terminals of the above network, while each terminal is executing function A, when one terminal executes function B, the other terminal executes functions C, D, and E, and when the execution of function D at this time becomes M>N, the other terminal sends information using function E, and one terminal executes functions C, D, and E. As the call communication is carried out, the communication channel of each terminal is always aligned with the currently set channel of the terminal with the larger count value information that is updated and stored, so that stray terminals that tend to have smaller count value information can inevitably return to the network channel.

[0064] In function C of each terminal of the network, if the receiving and demodulating unit does not detect a receiving and demodulating signal including the G-ID for a predetermined period of time, it is desirable to also perform an operation of displaying on a display means that the terminal is likely to be in a deviated terminal state and / or an operation of notifying that the terminal is in the deviated terminal state by outputting a predetermined sound from an audio output means.

[0065] The wireless communication device applicable to the group wireless communication network system according to the fourth aspect of the present invention can be configured as follows. A wireless communication device as a terminal having a common configuration in a simplex group wireless communication network, comprising a modulation / transmission unit and a reception / demodulation unit which cyclically scans a frequency control channel and all channels available in the network, wherein the modulation / transmission unit transmits a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CH-CCR") with a destination channel designation on the frequency control channel, and the wireless communication device is capable of changing the network channel by receiving the G-ID and the CH-CCR (hereinafter both signals are collectively referred to as "G-ID·CH-CCR") transmitted on the frequency control channel from another terminal during the cyclic scanning process of the reception / demodulation unit, the wireless communication device comprising: time storage means which updates and stores detection time information when transmission / reception of the G-ID·CH-CCR is detected; normal transmission means which sets a normal transmission mode in response to a predetermined instruction operation and transmits the G-ID and a call signal; and when the reception / demodulation unit does not detect a received demodulated signal including the G-ID for a predetermined time in the reception mode, the wireless communication device temporarily switches to the Modulated Transmission The transmission mode is automatically set by switching the G-ID and the currently set channel from the currently set channel, which is the channel used in the previous communication (excluding the frequency control channel), to the frequency control channel. relating to information (Hereinafter referred to as "current setting channel information")and detected time information of the time storage means; speech reproduction means for receiving and demodulating a speech signal and reproducing audio when the reception demodulation unit receives and demodulates a signal including the G-ID on the currently set channel in a state where the cyclic scanning on the same channel is temporarily stopped in a reception mode; information detection means for detecting currently set channel information and detected time information at the transmission source terminal included in the demodulated signal when the reception demodulation unit receives and demodulates a signal including the G-ID on the frequency control channel in a state where the cyclic scanning on the same channel is temporarily stopped in a reception mode; information storage means for updating and storing the currently set channel information and detected time information at the transmission source terminal detected by the information detection means; and a comparison means for comparing newly stored detected time information (T1) at the own terminal with detected time information (T2) at the source terminal updated and stored in the information storage means; and a corresponding processing means for, if the comparison result by the comparison means shows that T1 is later than T2, temporarily changing the modulation transmission unit to a transmission mode in which the currently set channel is changed to a frequency control channel and transmitting the G-ID, currently set channel information, and detected time information (T1) of the time storage means, if T2 is later than T1, changing the currently set channel to a channel indicated by receiving channel information in the information storage means, and rewriting the detected time information (T1) of the time storage means to the detected time information (T2) of the information storage means, and, if T1 and T2 are simultaneous, performing nothing and maintaining the current state. [Effects of the Invention]

[0066] In the present invention, in a simplex group wireless communication network, even if some terminals are unable to switch to the new channel when the channel being used in the network is changed because they are out of range or their power is turned off, and so they become separated from the network, each terminal updates and stores count value information on the change in network channel and information on the detection time of the change, and a predetermined algorithm using this information is executed during communication, automatically switching the transmission and reception channel of the separated terminal to the channel currently being used in the network, enabling a quick and smooth return to the network. [Brief explanation of the drawings]

[0067] [Figure 1] FIG. 1 is a block diagram of a wireless communication device according to an embodiment. [Figure 2] This is a list of frequencies and their channel numbers that can be used by specified low-power radio stations for simplex wireless communication. The channels with numbers enclosed in ovals are channels that are selectively used in the network in this embodiment, and channel number 31 (CH31) is the frequency control channel. [Figure 3] 1 is an example diagram of a communication frame format used in a group wireless communication network. [Figure 4] 1 is a diagram showing the cyclic scanning method of the receiving and demodulating unit RX1 of the wireless communication device (each terminal) in the first and second embodiments for each currently set channel. [Figure 5] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 6] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 7] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 8] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 9] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 10]FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 11] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 12] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 13] 10 is a flowchart showing a procedure for counting the number of times a G-ID·CCR (Group Identification Signal·Channel Change Request Signal) transmission and reception is detected by a wireless communication device that is a constituent terminal of a network in the first embodiment. [Figure 14] 5 is a flowchart showing the procedure for executing an operation in a transmission mode by a wireless communication device that is a constituent terminal of a network in the first embodiment. [Figure 15A] 5 is a flowchart showing the procedure for executing an operation in a reception mode by a wireless communication device that is a constituent terminal of a network in the first embodiment. [Figure 15B] 15B is a flowchart showing details of the operation execution procedure in step S30 of FIG. 15A. [Figure 16] FIG. 1 is a simplified configuration diagram of a network showing the initial state when a stray terminal is automatically returned to the network using transmission from a network-side terminal as a starting event in the first embodiment. [Figure 17] FIG. 1 is a simplified diagram of a network configuration showing the initial state when a stray terminal is automatically returned to the network in accordance with a transmission from the stray terminal side as a starting event in the first embodiment. [Figure 18] FIG. 2 is a simplified configuration diagram of a network showing a state in which a stray terminal has returned to the network in embodiment 1. [Figure 19] FIG. 2 is a simplified configuration diagram of a network showing the communication state after a stray terminal returns to the network in embodiment 1. [Figure 20] 10 is a flowchart showing a procedure for updating and storing detection time information related to transmission and reception of G-ID·CCR by a wireless communication device that is a constituent terminal of a network in the second embodiment. [Figure 21]10 is a flowchart showing the procedure for executing an operation in a transmission mode by a wireless communication device that is a constituent terminal of a network in the second embodiment. [Figure 22A] 10 is a flowchart showing the procedure for executing an operation in a reception mode by a wireless communication device that is a constituent terminal of a network in the second embodiment. [Figure 22B] 22B is a flowchart showing details of the operation execution procedure in step S70 of FIG. 22A. [Figure 23] FIG. 10 is a simplified configuration diagram of a network showing the initial state when a stray terminal is automatically returned to the network using transmission from a network-side terminal as a starting event in the second embodiment. [Figure 24] FIG. 10 is a simplified diagram of a network configuration showing the initial state when a stray terminal is automatically returned to the network using a transmission from the stray terminal as a starting event in the second embodiment. [Figure 25] FIG. 10 is a simplified configuration diagram of a network showing a state in which a stray terminal has returned to the network in embodiment 2. [Figure 26] 10 is a diagram showing the cyclic scanning method of the receiving and demodulating unit RX1 of the wireless communication device (each terminal) in the third and fourth embodiments for each currently set channel. FIG. [Figure 27] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 28] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 29] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 30] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 31] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 32] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 33] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 34]FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 35] 11 is a flowchart showing a procedure for counting the number of times transmission and reception of G-ID·CH-CCR (group identification signal·channel change request signal with destination channel designation) is detected by a wireless communication device that is a constituent terminal of a network in the third embodiment. [Figure 36] 11 is a flowchart showing the procedure for executing an operation in a transmission mode by a wireless communication device that is a constituent terminal of a network in the third embodiment. [Figure 37A] 11 is a flowchart showing the procedure for executing an operation in a reception mode by a wireless communication device that is a constituent terminal of a network in the third embodiment (however, there is an interrupt process in an automatic transmission mode in steps S117-S119 and step S122). [Figure 37B] 37B is a flowchart showing details of the operation execution procedure in step S122 of FIG. 37A. [Figure 38] FIG. 11 is a simplified configuration diagram of a network showing the initial state when a stray terminal is automatically returned to the network using transmission from a network-side terminal as a starting event in embodiment 3. [Figure 39] FIG. 11 is a simplified diagram of a network configuration showing the initial state when a stray terminal is automatically returned to the network in accordance with a start event of transmission from the stray terminal in the third embodiment. [Figure 40] FIG. 11 is a simplified configuration diagram of a network showing a state in which a stray terminal has returned to the network in embodiment 3. [Figure 41] 13 is a flowchart showing a procedure for updating and storing detection time information of G-ID·CH-CCR by a wireless communication device that is a constituent terminal of a network in the fourth embodiment. [Figure 42] 10 is a flowchart showing the procedure for executing an operation in a transmission mode by a wireless communication device that is a constituent terminal of a network in the fourth embodiment. [Figure 43A]10 is a flowchart showing the procedure for executing an operation in a reception mode by a wireless communication device that is a constituent terminal of a network in the fourth embodiment (however, there is an interrupt process in an automatic transmission mode in steps S177-S179 and step S182). [Figure 43B] 43B is a flowchart showing details of the operation execution procedure in step S182 of FIG. 43A. [Figure 44] FIG. 10 is a simplified configuration diagram of a network showing the initial state when a stray terminal is automatically returned to the network with transmission from a network-side terminal as the starting event in embodiment 4. [Figure 45] FIG. 10 is a simplified diagram of a network configuration showing the initial state when a stray terminal is automatically returned to the network in accordance with a start event of transmission from the stray terminal in the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0068] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a wireless communication network system and a wireless communication device according to the present invention will be described in detail with reference to the accompanying drawings. First, FIG. 1 is a block diagram of a business wireless communication device according to the embodiment described below, and this wireless communication device becomes the constituent terminals 51 to 55 and 61 to 65 of the network in the simplified configuration diagram of a simplex group wireless communication network shown in FIG. 5 and subsequent figures.

[0069] The receiving system of this wireless communication device is composed of an antenna 11, a receiving demodulation unit RX1, an amplifier 12, and a speaker (or earphone) 13. The radio wave signal received by the antenna 11 is input to the receiving demodulation unit RX1, which takes in the received signal of the controlled set channel, demodulates the received signal, and outputs it to the amplifier 12 on the condition that the squelch function is open. The demodulated signal is then amplified by the amplifier 12 and reproduced as audio by the speaker (or earphone) 13.

[0070] Channel control in the receiving and demodulating unit RX1 is performed by the system control unit 10. In the receiving mode, in the following embodiments 1 and 2, the control is performed by a method of cyclically scanning five channels (channel numbers 21, 25, 28, 43, and 49) selected from the channels numbered 20 to 30 and 41 to 49 in FIG. 2 that are usable by specified low-power radio stations / radio telephone radio equipment in the above-mentioned non-patent document 1. In the following embodiments 3 and 4, the control is performed by a method of cyclically scanning six channels, including the above-mentioned five channels and a frequency control channel (channel number 31) for transmitting and receiving control information. However, when a group identification signal is detected and a speech signal or information signal is demodulated, the cyclic scanning is stopped at the detected channel, and in this stopped state, the squelch function is opened and the demodulated signal is output to the amplifier 12. The specific order of channels in the cyclic scanning will be described in detail in each embodiment.

[0071] On the other hand, the transmission system of this wireless communication device comprises a microphone 15, an amplifier 16, a modulation transmission unit TX1, an amplifier 17 and an antenna 18. The audio signal from microphone 15 is amplified by amplifier 16 and output to modulation transmission unit TX1, which modulates a carrier wave with the audio signal and outputs it to amplifier 17. The modulated carrier wave signal is power-amplified by amplifier 17 and wirelessly transmitted from antenna 18. The system control unit 10 also controls the transmission channels and the like related to this transmission system.

[0072] The system control unit 10 controls the receiver / demodulator unit RX1 and the modulator / transmitter unit TX1 by executing a built-in program in response to events such as command input from the PTT button or various keys on the operation unit 19 or detection of various received and demodulated signals. The system control unit 10 also controls the entire system, including the amplifiers 12, 16, 17 and the liquid crystal display unit 20, and performs corresponding processing while updating and storing various data using a counter 21 and a memory 22 during control in each of the following embodiments.

[0073] FIG. 3 is a diagram showing an example of a communication frame format used in a group wireless communication network in each of the following embodiments. The transmitting terminal transmits a modulated wave modulated by MSK (Minimum Shift Keying) or the like using the baseband signal of the audio signal section incorporated in the same format, and the receiving terminal demodulates the received signal related to the modulated wave to reproduce the audio signal, while each information signal of the data payload received prior to the audio signal is separated and detected and used as data for operational control by the system control unit 10. The data payload contains a device identification signal (hereinafter referred to as "device ID") and a transmission / reception channel information signal, as well as a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CCR") or a channel request signal with a destination channel designation (hereinafter referred to as "CH-CCR"). In the following first and second embodiments, count value information relating to the number of times CCR or CH-CCR is transmitted and received and a signal relating to transmission and reception time information are added after the audio signal portion.

[0074] <<Embodiment 1>> This embodiment relates to the wireless communication device of FIG. 1 and a group wireless communication network system having the wireless communication device as a constituent terminal, and here, a simplex group wireless communication network consisting of five terminals 51 to 55 as shown in FIG. 5 is assumed. In the simplified network diagram represented by Figure 5, "TX1-CH21" in each of the terminals 51 to 55 indicates a state in which the modulation transmitter TX1 is set to the channel CH21 in Figure 2, and "RX1-SCAN" indicates a state in which the receiver demodulator RX1 is performing cyclic channel scanning. Also, "RX1-CH21" shown in the simplified network diagram below indicates a state in which the receiver demodulator RX1 has stopped cyclic scanning and is set to the channel CH21. It should be noted that modules not hatched are active, and modules hatched are inactive, and when the modulation transmission unit TX1 is active, the reception demodulation unit RX1 is inactive.

[0075] In this embodiment, the cyclic scanning performed by the receiving and demodulating unit RX1 of each terminal 51 to 55 is a method of prioritizing the currently set channel (the previous communication channel) among the five channels (CH21, CH25, CH28, CH43, CH49) selected as channels available in the network, as shown in (1) to (5) of Figure 4, and scanning periods for other channels are sequentially interposed between scanning periods for the currently set channel. Therefore, if the scanning time per channel is approximately 100 msec, the total scanning time for the currently set channel is approximately 400 msec, and the total scanning time for the other four channels is approximately 400 msec, meaning that the currently set channel is allocated four times the scanning time of each of the other channels.

[0076] The cause of the occurrence of a stray terminal in this network is the following transition of the network state. Figure 5 shows a state in which the network channel is CH21 and all terminals 51 to 55 are in receiving (standby) mode, the modulation transmission unit TX1 of each terminal 51 to 55 is set to CH21 but is in an inactive state, and the reception demodulation unit RX1-SCAN is performing cyclic scanning as shown in (1) of Figure 4.

[0077] From the state shown in Figure 5, since the network is a simplex system, for example, as shown in Figure 6, if terminal 51 performs carrier sense (hereinafter referred to as "CS") on CH21 and is able to transmit, it activates the modulation transmission unit TX1-CH21 and transmits the G-ID and call signal, and in the other terminals 52 to 55, the receiving and demodulating unit RX1-SCAN receives and demodulates the G-ID at the scanning stage of CH21 in the cyclic scanning of (1) in Figure 4, so as shown in Figure 7, the cyclic scanning is stopped at CH21 and the call signal is demodulated.

[0078] Incidentally, a terminal that transitions to transmission mode and attempts to transmit an audio signal always sets its transmission channel to the receiving and demodulating unit RX1 and executes CS as described above, and unless it can confirm that there is no interference on that channel, it cannot perform the transmission operation with the modulation and transmitting unit TX1 set to that channel [Ministry of Posts and Telecommunications Notification No. 49 of 1989, Ministry of Internal Affairs and Communications Notification No. 308 of 2021, and (3) Carrier Sense, pages 1-10 of Volume 1 in the above-mentioned non-patent document 1].

[0079] Figure 8 shows a state in which the receiving and demodulating unit RX1-CH21 of terminal 53 has performed CS on the current setting channel CH21 (which is also the network channel), which was the previous communication channel, but interference has occurred.Since terminal 53 cannot transmit on CH21, the receiving and demodulating unit RX1 switches to another channel CH28 to perform CS. Regarding the selection of this other channel, a method of arbitrarily selecting a channel and performing CS can be used, but it is also possible to adopt a method in which better available channels are prioritized in advance as candidate channels, and then CS is performed by selecting them in that order, as proposed in Patent Application No. 2023-074015 by the applicant of the present application, as described in the [Background Art] section above.

[0080] If there is no interference with the CS of CH28, the terminal 53 activates the modulation transmission unit TX1 on CH28 to transmit the GID and CCR, as shown in FIG. Meanwhile, the other terminals 51, 52, 54, and 55 receive and demodulate the G-ID and CCR during the scanning stage of CH28 in the cyclic scanning of the receiving and demodulating unit RX1-SCAN. However, based on the fact that G-ID is an identification signal of the group to which the terminal belongs and CCR is a channel change request, the terminals change the communication channel from CH21 to CH28, which is the receiving channel for G-ID and CCR, as shown in FIG. 10.

[0081] As a result, as shown in Figure 10, the communication channel of all terminals 51 to 55 is changed to CH28 and the network channel is shifted to CH28, and just as in the case of CH21 before interference (Figures 6 and 7), each terminal 51 to 55 can activate the modulation transmission unit TX1-CH28 as appropriate and transmit call signals to other terminals.

[0082] However, at the stage in Figure 9, i.e., when terminal 53 transmits the G-ID and CCR to other terminals 51, 52, 54, and 55 on CH28, if any of terminals 51, 52, 54, and 55 happens to be out of range or has its power turned off, that terminal will naturally not be able to receive the G-ID and CCR and will not be able to respond to the change in network channel. For example, Figure 11 shows a case where terminal 55 is out of range at the stage shown in Figure 9, and terminals 51, 52, and 54 are able to receive the G-ID and CCR from terminal 53 using the receiving and demodulating unit RX1-SCAN and change their own communication channel to CH28, but terminal 55 misses this opportunity, and as shown in Figure 12, only terminal 55 remains on CH21 and becomes a deviated terminal. Therefore, even if terminal 55 returns to the service area or is powered on, it is not possible to restore communication with other terminals 51 to 54 and it is not possible to return to the network.

[0083] In this case, terminals 51 to 54 cannot recognize that terminal 55 has deviated from the network simply because there continues to be no calls from terminal 55. Also, even though the currently set channel for terminal 55 remains CH21 and it continues to be in a state where it does not receive calls from other terminals 51 to 54, in a network with few calls it will take a considerable amount of time for terminal 55 to recognize that it has deviated from the network.

[0084] Therefore, the wireless communication device in this embodiment is applied to terminals 51 to 55 in the group wireless communication network, so that a terminal that has strayed can always automatically return to the network and regain a communicable state simply by returning to a communication range or by turning the power back on within the range.

[0085] First, the wireless communication device of this embodiment (FIG. 1) executes the procedure shown in FIG. 13 in the group wireless communication mode. First, when the group wireless communication mode is set from the operation unit 19, the system control unit 10 resets the counter 21 and memory 22 (S1), and then checks whether the modulation transmission unit TX1 of the own terminal has transmitted the G-ID and CCR, and whether the reception demodulation unit RX1-SCAN has received and demodulated the G-ID and CCR from other terminals (S2, S3), and repeats the operation of incrementing the count value of the counter 21 by +1 each time this is detected (S4, S5 → S2).

[0086] Therefore, comparing the transitions in the network state (Figures 5 to 10), at the stage in Figure 9, terminal 53 transmits G-ID and CCR using modulation transmission unit TX1-CH28, causing the count value of counter 21 of terminal 53 to be incremented by +1, and terminals 51, 52, 54, and 55 receive G-ID and CCR using their respective reception demodulation units RX1-SCAN, causing the count value of counter 21 of each terminal 51, 52, 54, and 55 to be incremented by +1. However, as shown in Figure 11, when terminal 53 transmits the G-ID and CCR using modulation transmission unit TX1-CH28, terminal 55, which is located outside the service area or has its power turned off, is unable to receive the G-ID and CCR, and therefore the count value of counter 21 is not incremented. That is, as shown in FIG. 12, the communication channel of the deviated terminal 55 remains CH21, which is different from the communication channel CH28 of the other terminals 51, 52, 54, and 55, and the count value of the counter 21 is smaller than the count values ​​of the counters 21 of the other terminals 51, 52, 54, and 55.

[0087] The wireless communication device of this embodiment, as a constituent terminal of a simplex wireless communication network, utilizes the difference in count values ​​that inevitably occurs in the execution procedure of Figure 13 when a stray terminal occurs, and executes the procedures shown in the flowcharts of Figures 14, 15A and 15B to automatically return the stray terminal to the network, regardless of whether it is from the same terminal or another party. First, FIG. 14 shows the procedure for transmitting a speech signal in the transmission mode. In the receive mode, if the PTT button on the operation unit 19 is turned on and the transmit mode is set in order to send a voice message to another terminal on the network, an interrupt is immediately initiated (S10, S11), and the receive demodulation unit RX1 executes CS on the currently set channel, and provided that there is no interference (hereinafter, an explanation of the CS-related procedure will be omitted), the modulation transmission unit TX1 transmits the G-ID, etc. (including the terminal's own ID, etc. in addition to the G-ID), and then the carrier signal is modulated with the input voice signal from the microphone 15 to transmit the voice message (S12, S13).

[0088] In a normal wireless communication device, when the transmission of a voice message is completed and the PTT button is turned OFF, a communication end signal is immediately sent and the transmission of the voice message is ended. However, in the wireless communication device of this embodiment, the processing does not end immediately after the PTT button is turned OFF. Instead, the current count value information of the counter 21 is read and sent as an additional signal, and then the communication end signal is sent and the interrupt processing is terminated (S14, S15, S16).

[0089] In the receive mode, if there is no interrupt process due to the transmit mode setting, the procedure in FIG. 15A is executed. First, the receiving and demodulating unit RX1 performs a cyclic scan of any one of (1) to (5) in Figure 4, and if a G-ID is received and demodulated during the scanning process, it stops the scanning operation on that receiving channel (S20 to S22). If the channel that has been stopped is the currently set channel of the own device, the sender is another terminal that belongs to the group and is set to the same communication channel, and since this is the other terminal with which normal group communication should be performed, the call signal is played back as voice, and the device returns to the standby state by detecting a communication end signal (S23: Y → S24, S25 → S20). In this case, the currently set channel (communication channel) of the receiving terminal itself and the transmitting terminal of the other party is not necessarily a network channel, and both may be deviated terminals.

[0090] On the other hand, if the stopped channel is not the currently set channel of the own terminal (S23:N), the sending terminal belongs to the group but the currently set channel of the own terminal and the sending terminal are different, which corresponds to either a state where either the own terminal or the sending terminal is a deviating terminal, or a state where both are deviating terminals and their currently set channels are different. In this case, if there is a speech signal, it is demodulated to reproduce the voice (S26, S27), and the count value information added to the end of the speech signal is received and demodulated (S28). Also, the demodulated count value information is updated and stored in the memory 22 together with the channel information of the reception demodulation unit RX1 that was stopped upon detection of the G-ID (S29). In addition, step 26 also assumes the case where there is no call signal. This is because it takes into account not only the transmission of voice and information signals from other terminals in steps S11 to S16 of Figure 14, but also the case where the transmission mode is automatically set in Figure 15B described below and count value information is transmitted after a voice signal frame containing G-ID, etc. and no voice information (S33 to S36).

[0091] Then, every time the channel information and count value information in memory 22 are updated, the count value information (M times) of counter 21 is compared with the updated count value information (N times) of memory 22, and appropriate processing is performed according to the comparison result (S29, S30). This means that the count value information (N times) in memory 22 corresponds to the count value information of the source terminal (i.e., a terminal that belongs to a group but has a different communication channel from the terminal itself), and by comparing this with the count value information (M times) in the counter 21 of the terminal itself, it is determined which terminal has a higher probability of being a deviating terminal, and the corresponding processing is selected depending on the result.

[0092] The comparison result and specific steps related to the corresponding process (S30) are shown in FIG. 15B. If M>N: The transmission mode is automatically set and an interrupt is generated, and the modulation transmission unit TX1 is set as the currently set channel, and the G-ID, etc. and count value information of the counter 21 (M times) are transmitted. Upon completion of this, the reception mode is automatically restored and the interrupt processing is exited (S31 → S32 to S36). If N>M: The currently set channel of the own device is changed to the channel related to the updated channel information stored in memory 22, and the count value information (M times) of counter 21 is rewritten to the count value information (N times) of memory 22 (S31 → S37 → S38, S39). When M=N: No action is taken and the current situation is maintained (S31 → S40).

[0093] The above has explained the function from the viewpoint of a single wireless communication device applied to a simplex group wireless communication network. Next, we will explain in detail how the stray terminal 55 can be returned to the group network from the network state in which the stray terminal 55 occurred (Figure 12).

[0094] FIG. 16 shows a case where a sequence for returning the stray terminal 55 to the network is executed when one of the terminals 51 to 54 other than the stray terminal 55 (terminal 51 in this case) enters the transmission mode and starts a call as a start event. First, as shown in the figure, the network channel is CH28, but the currently set channel of the stray terminal 55 is CH21. Here, the terminal 51 executes steps S11 to S16 in FIG. 14, switches to the transmission mode, and transmits the count value information of the counter 21 together with the G-ID etc. and the call signal from the modulation transmission unit TX1-CH 28. In contrast, terminals 52 to 54 execute steps S20 to S23 of Figure 15A, and when the G-ID is received and demodulated during the cyclic scanning process [(3) of Figure 4] in which the receiving and demodulating unit RX1-SCAN prioritizes the currently set channel CH28, the scanning operation is stopped on that receiving channel.In this case, since the currently set channel of terminals 52 to 54 and terminal 51 is network channel CH28, the stopped channel in terminals 52 to 54 is the same as the currently set channel CH28 (S23:Y). Therefore, terminals 52 to 54 execute steps S23 → S24, S25 → S20 in Figure 15A, and the receiving and demodulating unit RX1 receives and demodulates the call signal from terminal 51 on the currently set channel CH28 and plays it back, and receives and demodulates the communication end signal, thereby returning the receiving and demodulating unit RX1 from the stopped state to the cyclic scanning state.

[0095] On the other hand, in the deviating terminal 55, the receiving and demodulating unit RX1-SCAN receives and demodulates the G-ID etc. at the scanning stage of CH28 in the cyclic scanning [(1) in Figure 4] that prioritizes the currently set channel CH21, and stops the scanning operation (S20-S22), but in this case the stopped channel C28 and the currently set channel CH21 are different (S23:N). Therefore, the deviating terminal 55 executes step S23:N→S26 to S30 in FIG. 15A. That is, if there is a speech signal (in this case, there is a speech signal), it is received and demodulated to reproduce the audio, and when the count value information following the audio signal frame is received and demodulated, the reception channel information (in this case, CH28) and the count value information are updated and stored in memory 22, and further, the count value information (M) of counter 21 is compared with the updated and stored count value information (N) of memory 22, and appropriate processing is performed based on the comparison result.

[0096] In the case of the deviated terminal 55, the count value information (N) in memory 22, which is the count value information of terminal 51, is greater than the count value information (M) of the terminal itself, and the comparison result is N>M, so in step S30 of Figure 15A, the procedure of steps S31 → S37 to S39 of Figure 15B is executed. Therefore, the currently set channel CH21 of the stray terminal 55 is changed to the channel CH28 indicated by the received channel information updated and stored in the memory 22, and the count value information (M) of the counter 21 is also rewritten to the count value information (N) of the memory 22, so that the communication channel and count value information become the same as those of the terminal 51. As a result, the terminal 55 can return to the group communication network from the stray state.

[0097] Next, FIG. 17 shows a case where the stray terminal 55 enters a transmission mode and transmits a call signal, which becomes a starting event and executes a sequence for returning to the network. First, as shown in the figure, the network channel is CH28, but the currently set channel of the stray terminal 55 is CH21. In this case, the deviated terminal 55 executes steps S11 to S16 in FIG. 14, switches to the transmission mode, and transmits the count value information of the counter 21 together with the G-ID etc. and the voice signal from the modulation transmission unit TX1-CH21.

[0098] In contrast, terminals 51 to 54 in receiving mode execute steps S20 to S22 in Figure 15A, and when the G-ID is received and demodulated during the cyclic scanning process [(3) in Figure 4] in which the receiving and demodulating unit RX1-SCAN prioritizes the currently set channel CH28, the scanning operation is stopped on that receiving channel.In this case, since the currently set channel of the deviating terminal 55 is CH21, the scanning operation is stopped on CH21. In this case, the currently set channel for the terminals 51 to 54 is CH28, which is different from the channel CH21 on which the scanning operation has been stopped (S23: N).

[0099] Therefore, the terminals 51 to 54 execute steps S23:N → S26 to S30 in Figure 15A, update and record in memory 22 the count value information received and demodulated following the audio signal from the deviated terminal 55 along with the receiving channel information, compare the count value information (M) of their own counter 21 with the count value information (N) in memory 22, and perform appropriate processing according to the comparison result. In this case, since the count value information (N) in memory 22 relates to the deviating terminal 55, the relationship M>N holds, and terminals 51 to 54 execute steps S31 → S32 to S36 in Figure 15B at step S30 in Figure 15A. That is, the terminals 51 to 54 are automatically set to the transmission mode, and when an interrupt is applied, they transmit the G-ID etc. and the count value information (M) of the counter 21 from the modulation transmission unit TX1-CH28 on the currently set channel (CH28), and then return to the reception mode. However, in reality, there is a conflict between the transmissions of the terminals 51 to 54 on the currently set channel (CH28), so only one of the terminals with which CS is established first (hereinafter referred to as terminal 5X) can transmit.

[0100] On the other hand, in response to the information transmission from the terminal 5X, the deviated terminal 55 then executes steps S20 to S22 in FIG. 15A. That is, when a G-ID or the like is received and demodulated during the cyclic scanning process [(1) in Figure 4] in which the receiving and demodulating unit RX1-SCAN gives priority to the currently set channel CH21, the scanning operation is stopped at that receiving channel. In this case, since the currently set channel of terminal 5X is CH28, the scanning operation is stopped at CH28. In this case, the currently set channel of the deviated terminal 55 is CH21, which is different from the channel CH28 on which the scanning operation is stopped (S23:N), so steps S23:N→S26 to S30 in FIG. 15A are executed. That is, when the deviating terminal 55 receives and demodulates the count value information from the terminal 5X, it updates and stores the count value information in the memory 22 along with the receiving channel CH28, and then compares the count value information (M) of its own counter 21 with the updated count value information (N) stored in the memory 22 and performs the corresponding processing.

[0101] The result of the comparison is that N>M, since M is the count value information of the deviating terminal, and steps S31 → S37 to S39 of Figure 15B are executed in the deviating terminal 55, and the currently set channel CH21 is changed to channel CH28 indicated by the receiving channel information in memory 22, which is the currently set channel on the terminal 5X side, and the count value information (M) of counter 21 is also rewritten to the count value information (N) in memory 22. As a result, the communication channel of the stray terminal 55 is changed from CH21 to CH28, and the stray terminal 55 is able to return to the group network from the stray state.As shown in Figure 18, the currently set channel (communication channel) of all terminals 51 to 55 is set to network channel CH28, and the detection time information of each terminal 51 to 55 is also consistent. As shown in FIG. 19, no matter which terminal in the network (terminal 53 in the figure) becomes the transmitting terminal, other terminals (terminals 51, 52, 54, and 55 in the figure) can receive and demodulate the G-ID, etc., during the scanning stage of CH28 in the cyclic scanning [(3) in FIG. 4] that prioritizes the currently set channel CH28 of the receiving and demodulating unit RX1-SCAN, and then proceed directly to the playback state of the call signal (S20 to S25 in FIG. 15A).

[0102] <<Embodiment 2>> As in the first embodiment, this embodiment relates to a group wireless communication network system having the wireless communication device of Figure 1 and its constituent terminals, and assumes a simplex group wireless communication network consisting of five terminals 51 to 55 as shown in Figure 5. Furthermore, the five channels selected as available for use in the network in this embodiment and the cyclic scanning conditions of the receiving and demodulating unit RX1-SCAN in each of the terminals 51 to 55 are the same as those in the first embodiment. Furthermore, the causes of the occurrence of deviating terminals in this network are the same as those explained in the first embodiment with reference to FIGS.

[0103] The difference between the wireless communication device of this embodiment and embodiment 1 is that as a constituent terminal of a group wireless communication network, embodiment 1 uses the magnitude relationship of the count value information of the number of transmissions and receptions of G-ID and CCR as a comparison factor for the estimated probability of being a deviant terminal, whereas embodiment 1 uses the order of the detection time information related to the latest transmission and reception of G-ID and CCR as a comparison factor. This is based on the fact that a terminal with a later latest transmission / reception time of the G-ID and CCR has been in the network for a more recent period, and therefore can be considered to have a lower estimated probability of being a stray terminal.

[0104] Therefore, in the wireless communication device of embodiment 1, Figure 13 shows the procedure for counting the number of times G-ID and CCR are sent and received, but in this embodiment, Figure 20 shows the procedure for updating and storing detection time information related to the sending and receiving of G-ID and CCR. Specifically, when the group wireless communication mode is set from the operation unit 19, the system control unit 10 resets the memory 22 (S41), and then detects whether the modulation transmission unit TX1 of the own terminal has transmitted the G-ID and CCR, and whether the reception demodulation unit RX1-SCAN has received and demodulated the G-ID and CCR from another terminal (S42, S43).Each time such detection is made, the system control unit 10 repeats the operation of updating and storing the time information of the built-in timer in the [A] area of ​​the memory 22 as detected time information (S44, S45 → S42).

[0105] According to the method of updating and storing the detection time of the transmission and reception of the G-ID and CCR in this embodiment, for a terminal that is capable of communicating in the group wireless communication network, the latest detection time information relating to the change of network channel due to the transmission and reception of the G-ID and CCR is always updated and stored in the [A] area of ​​memory 22, but for a stray terminal that is out of range or has its power turned off when the G-ID and CCR are transmitted and received, the record will no longer contain the latest detection time information.

[0106] The wireless communication device of this embodiment, as a constituent terminal of a simplex wireless communication network, utilizes the difference in detection time information in the [A] area of ​​memory 22 that inevitably occurs in the execution procedure of Figure 20 when a stray terminal occurs, and executes the procedures shown in the flowcharts of Figures 21, 22A and 22B to automatically return the stray terminal, whether it is from the same terminal or another party, to the network.

[0107] First, FIG. 21 shows the signal transmission procedure in the transmission mode. In the receive mode, if the PTT button on the operation unit 19 is turned on and the transmit mode is set in order to send a voice message to another terminal on the network, an interrupt is immediately generated (S50, S51). Provided that there is no interference when the receive demodulation unit RX1 executes CS on the currently set channel, the modulation transmission unit TX1 transmits the G-ID, etc., and then modulates the carrier signal with the input voice signal from the microphone 15 to transmit the voice message (S52, S53).

[0108] In a normal wireless communication device, when the transmission of a voice message is completed and the PTT button is turned OFF, a communication end signal is immediately sent and the transmission of the voice message is ended. However, in the wireless communication device of this embodiment, the processing does not end immediately after the PTT button is turned OFF. Instead, the detection time information is read from the [A] area of ​​memory 22 and sent as an additional signal, and then the communication end signal is sent and the interrupt processing is terminated (S54, S55, S56).

[0109] In the receive mode, if there is no interrupt process due to the transmit mode setting, the procedure in FIG. 22A is executed. First, the receiving and demodulating unit RX1 performs a cyclic scan of any of (1) to (5) in Figure 4, and if a G-ID is received and demodulated during the scanning process, it stops the scanning operation on that receiving channel (S60 to S62). If the channel that has been stopped is the currently set channel of the own device, the sender is another terminal that belongs to the group and is set to the same communication channel, and since this is the other terminal that should be performing normal group communication, the call signal is played back as voice, and the device returns to standby mode by detecting a communication end signal (S63: Y to S64, S65 → S60). In this case, the currently set channel (communication channel) of the receiving terminal itself and the transmitting terminal of the other party is not necessarily a network channel, and both may be deviated terminals.

[0110] On the other hand, if the stopped channel is not the currently set channel of the own terminal (S63:N), the sending terminal belongs to the group but the sending and receiving channels are different from the own terminal, which corresponds to either a state where either the own terminal or the sending terminal is a deviating terminal, or a state where both are deviating terminals and their currently set channels are different. In this case, if there is a speech signal, it is demodulated to reproduce the audio (S66, S67), and the detection time information added to the end of the speech signal is received and demodulated (S68). Also, the demodulated detection time information is updated and stored in the [B] area of ​​the memory 22 together with the channel information of the reception demodulation unit RX1 that was stopped upon detection of the G-ID (S69). In addition, step 66 also assumes the case where there is no call signal. This is because it takes into account not only the transmission of voice and information signals from other terminals in steps S51 to S56 of Figure 21, but also the case where the transmission mode is automatically set in Figure 22B described below and count value information is transmitted after a voice signal frame containing G-ID, etc. and no voice information (S73 to S76).

[0111] Then, every time the receiving channel information and detection time information in the [B] area of ​​memory 22 are updated, the detection time information (T1) in the [A] area of ​​memory 22 is compared with the updated detection time information (T2) in the [B] area, and appropriate processing is performed according to the comparison result (S69, S70). This means that the detection time information (T2) in the [B] area of ​​memory 22 corresponds to the detection time information of the source terminal (i.e., a terminal that belongs to a group but has a different communication channel from the own terminal), and by comparing this with the detection time information (T1) in the [A] area of ​​the own terminal's memory 22, it is determined which terminal has a higher estimated probability of being a deviating terminal, and the corresponding processing is selected based on the result.

[0112] The specific procedure for this comparison and correspondence process (S70) is shown in FIG. 22B. If T1 is later than T2: The transmission mode is automatically set and an interrupt is generated, and the modulation transmission unit TX1 is set as the currently set channel, and the G-ID, etc. and the detection time information (T1) in the [A] area of ​​memory 22 are transmitted. Upon completion of this, the reception mode is automatically restored and the interrupt processing is exited (S71 → S72 to S76). If T2 is later than T1: The currently set channel of the own device is changed to the updated channel stored in the [B] area of ​​memory 22, and the detection time information (T1) in the [A] area of ​​memory 22 is rewritten to the detection time information (T2) in the [B] area of ​​memory 22 (S71 → S77 to S79). When T1 and T2 are simultaneous (T1=T2): No action is taken and the currently set channel is maintained as is (S71→S80).

[0113] The above has explained the function from the viewpoint of a single wireless communication device applied to a simplex group wireless communication network. Next, we will explain in detail how to return the stray terminal 55 to the group network from the network state in which the stray terminal 55 occurred (Figure 12).

[0114] FIG. 23 shows a case where a sequence for returning the stray terminal 55 to the network is executed, with the start event being that one of the terminals 51 to 54 other than the stray terminal 55 (terminal 51 in this case) goes into transmission mode and starts a call. As shown in the figure, the network channel is CH28, but the currently set channel of the stray terminal 55 is CH21. Here, the terminal 51 executes steps S51 to S56 in FIG. 21, switches to the transmission mode, and transmits the G-ID and the like and the call signal together with the detection time information in the [A] area of ​​the memory 22 from the modulation transmission unit TX1-CH28.

[0115] In contrast, terminals 52 to 54 execute steps S60 to S63 of Figure 22A, and when a G-ID or the like is received and demodulated during the cyclic scanning process [(3) of Figure 4] in which the receiving and demodulating unit RX1-SCAN gives priority to the currently set channel CH28, the scanning operation is stopped on that receiving channel.In this case, since the currently set channel of terminals 52 to 54 and terminal 51 is network channel CH28, the stopped channel in terminals 52 to 54 is the same as the currently set channel CH28. Therefore, terminals 52 to 54 execute steps S63 → S64, S65 → S60 in Figure 22A, and the receiving and demodulating unit RX1 receives and demodulates the call signal from terminal 51 on the currently set channel CH28 and plays it back, and receives and demodulates the communication end signal, thereby returning the receiving and demodulating unit RX1 from the stopped state to the cyclic scanning state.

[0116] On the other hand, in the deviating terminal 55, the receiving and demodulating unit RX1-SCAN receives and demodulates the G-ID at the scanning stage of CH28 in the cyclic scanning [(1) in Figure 4] that prioritizes the currently set channel CH21, and stops the scanning operation (S60-S62), but in this case the stop channel C28 and the currently set channel CH21 are different (S63:N). Therefore, the deviating terminal 55 executes steps S63, S66 to S70 in FIG. 22A. That is, if there is a speech signal (in this case, there is a speech signal), it is received and demodulated to reproduce the audio, and when the detection time information following the audio signal frame is received and demodulated, the reception channel information (in this case, CH28) and the detection time information are updated and stored in the [B] area of ​​memory 22, and further, the detection time information (T1) in the [A] area of ​​memory 22 is compared with the updated and stored detection time information (T2) in the [B] area of ​​memory 22, and appropriate processing is performed based on the comparison result.

[0117] In this case, since the detection time information (T1) is from the deviating terminal 55, the comparison result is that "T2 is later than T1", and in step S70 of Figure 22A, the procedure of steps S71 → S77 to S79 ​​of Figure 22B is executed. Therefore, the currently set channel CH21 of the stray terminal 55 is changed to channel CH28 indicated by the received channel information updated and stored in memory 22, and the detection time information (T1) in the [A] area of ​​memory 22 is also rewritten to the detection time information (T2) in the [B] area of ​​memory 22, so that the communication channel and detection time information become the same as those of terminal 51. As a result, terminal 55 can return to the group communication network from the stray state.

[0118] Next, FIG. 24 shows a case where the returning sequence to the network is executed when the stray terminal 55 enters the transmission mode and transmits a call signal, which is the starting event. As shown in the figure, the network channel is CH28, but the currently set channel of the stray terminal 55 is CH21. In this case, the deviated terminal 55 executes steps S51 to S56 in FIG. 21, switches to transmission mode, and transmits the G-ID and other information and audio signal together with the detection time information in the [A] area of ​​the memory 22 from the modulation transmission unit TX1-CH21.

[0119] In contrast, terminals 51 to 54 in the receiving mode execute steps S60 to S62 in Figure 22A, and when a G-ID or the like is received and demodulated during the cyclic scanning process [(3) in Figure 4] in which the receiving and demodulating unit RX1-SCAN prioritizes the currently set channel CH28, the scanning operation is stopped on that receiving channel. In this case, however, since the currently set channel of the deviating terminal 55 is CH21, the scanning operation is stopped on CH21. In this case, the currently set channel of the terminals 51 to 54 is CH28, which is different from the channel CH21 on which the scanning operation is stopped (S63:N), so steps S63:N→S66 to S70 in FIG. 22A are executed.

[0120] Therefore, terminals 51 to 54 update and record in the [B] area of ​​memory 22 the detection time information received and demodulated following the audio signal from deviated terminal 55 along with the receiving channel information, compare the detection time information (T1) in the [A] area of ​​their own memory 22 with the detection time information (T2) in the [B] area of ​​memory 22, and perform appropriate processing according to the comparison result. In this case, the detection time information (T2) relates to the deviating terminal 55 and has the relationship "T1 is later than T2", so steps S71 → S72 to S76 in Figure 22B are executed in step S70 in Figure 22A. In other words, terminals 51 to 54 will automatically set to transmission mode, and when an interrupt is applied, will transmit the G-ID, etc. and detection time information in the [A] area of ​​memory 22 on the currently set channel (CH28) from modulation transmission unit TX1-CH28, and then return to reception mode. However, in reality, there is a conflict between the transmissions of the terminals 51 to 54 on the currently set channel (CH28), so only one of the terminals with which CS is established first (hereinafter referred to as terminal 5X) can transmit.

[0121] On the other hand, in response to the information transmission from the terminal 5X, the deviating terminal 55 executes steps S60 to S62 of Figure 22A, and when the G-ID etc. is received and demodulated during the cyclic scanning [(1) of Figure 4] in which the currently set channel CH21 is given priority by the receiving and demodulating unit RX1-SCAN, the scanning operation is stopped on that receiving channel. In this case, since the currently set channel of the terminal 5X is CH28, the scanning operation is stopped on CH28. In this case, the currently set channel of the deviating terminal 55 is CH21, which is different from the channel CH28 on which the scanning operation is stopped (S63: N), and therefore steps S63, S66 to S70 in FIG. 22A are executed. That is, when the deviating terminal 55 receives and demodulates the detection time information from terminal 5X, it updates and stores the detection time information along with the receiving channel CH28 in the [B] area of ​​memory 22, and then compares the detection time information (T1) in the [A] area of ​​its own memory 22 with the updated detection time information (T2) stored in the [B] area of ​​memory 22 to perform corresponding processing.

[0122] In this case, since T1 corresponds to the detection time information of the deviating terminal 55 and T2 corresponds to the detection time information of terminal 5X, the result of the comparison is the relationship in Figure 22B where "T2 is later than T1", and steps S71 → S77 to S79 ​​are executed in the deviating terminal 55, the currently set channel CH21 is changed to channel CH28 indicated by the receiving channel information in area [B] of memory 22, which is the currently set channel on the terminal 5X side, and the detection time information (T1) in area [A] of memory 22 is rewritten to the detection time information (T2) in area [B] of memory 22. As a result, the communication channel of the stray terminal 55 is changed from CH21 to CH28, and the stray terminal 55 is able to return to the group network from the stray state.As shown in Figure 25, the currently set channel (communication channel) of all terminals 51 to 55 is set to network channel CH28, and the detection time information of each terminal 51 to 55 is also consistent.

[0123] <<Embodiment 3>> Like the previous embodiment, this embodiment relates to a group wireless communication network system having the wireless communication device of Figure 1 and its constituent terminals, and here we assume a simplex group wireless communication network consisting of five terminals 61 to 65 as shown in Figure 27. In the simplified network diagram represented by Fig. 27, "TX1-CH21" in each of the terminals 61 to 65 indicates a state in which the modulation transmitter TX1 is set to the channel CH21 in Fig. 2, and "RX1-SCAN" indicates a state in which the receiver demodulator RX1 is performing cyclic channel scanning. Also, "RX1-CH21" shown in the simplified network diagram below indicates a state in which the receiver demodulator RX1 has stopped cyclic scanning and is set to the channel CH21. It should be noted that modules not hatched are active, and modules hatched are inactive, and when the modulation transmission unit TX1 is active, the reception demodulation unit RX1 is inactive.

[0124] In this embodiment, the cyclic scanning performed by the receiving and demodulating unit RX1 of each terminal 61 to 65 is an alternating scanning method that prioritizes the frequency control channel among the five channels (CH21, CH25, CH28, CH43, CH49) selected as channels available in the network and the frequency control channel (CH31), as shown in (1) to (5) of Figure 26, and interleaves a scanning period for one of the five channels, which is the currently set channel (the channel used in the previous communication), between scanning periods for the frequency control channel. Therefore, if the scanning time per channel is approximately 100 msec, the total scanning time for the frequency control channel (CH31) and the currently set channel is approximately 400 msec, and the scanning time for one cycle: approximately 800 msec is allocated equally to both channels.

[0125] The cause of the occurrence of a stray terminal in this network is the following transition of the network state. Figure 27 shows a state in which the network channel is CH21 and all terminals 61 to 65 are in receiving (standby) mode, the modulation transmission unit TX1 of each terminal 61 to 65 is set to CH21 but is in an inactive state, and the receiving demodulation unit RX1-SCAN is performing cyclic scanning as shown in (1) of Figure 26.

[0126] Since the state of Figure 27 shows that this is a simplex network, for example, as shown in Figure 28, if terminal 61 executes CS on CH21 and is able to transmit, it activates the modulation transmission unit TX1-CH21 and transmits a G-ID and a call signal, etc., and in other terminals 62 to 65, the receiving and demodulating unit RX1-SCAN receives and demodulates the G-ID at the scanning stage of CH21 in the cyclic scanning of (1) of Figure 26, so as shown in Figure 29, the cyclic scanning is stopped at CH21 and the call signal is demodulated and reproduced.

[0127] Incidentally, a terminal that transitions to transmission mode and attempts to transmit an audio signal always sets its transmission channel to the receiving and demodulating unit RX1 and executes CS as described above, and unless it can confirm that there is no interference on that channel, it cannot perform the transmission operation with the modulation and transmitting unit TX1 set to that channel [Ministry of Posts and Telecommunications Notification No. 49 of 1989, Ministry of Internal Affairs and Communications Notification No. 308 of 2021, and (3) Carrier Sense, pages 1-10 of Volume 1 in the above-mentioned non-patent document 1].

[0128] Figure 30 shows a state in which the receiving and demodulating unit RX1-CH21 of terminal 63 has performed CS on the current setting channel CH21 (which is also the network channel), which was the previous communication channel, but interference has occurred.Since terminal 63 cannot transmit on CH21, it switches the receiving and demodulating unit RX1 to the frequency control channel CH31 and performs CS.

[0129] If there is no interference with the CS of CH31, terminal 63 activates modulation transmission unit TX1 on frequency control channel CH31 and transmits G-ID and CH-CCR (the designated change channel is CH28) as shown in FIG. Meanwhile, the other terminals 61, 62, 64, and 65 receive and demodulate the G-ID and CH-CCR during the scanning stage of CH31 in the cyclic scanning of the receiving and demodulating unit RX1-SCAN, and change the communication channel from CH21 to the designated destination channel, CH28, based on the fact that G-ID is the identification signal of the group to which the terminal belongs and CH-CCR is a channel change request accompanied by a specification of the destination channel.

[0130] As a result, as shown in Figure 32, the communication channel of all terminals 61 to 65 is changed to CH28 and the network channel is shifted to CH28, and just as in the case of CH21 before interference (Figures 28 and 29), each terminal 61 to 65 can activate the modulation transmission unit TX1-CH28 as appropriate and transmit call signals to other terminals. In this embodiment, CH-CCR is used instead of CCR used in the first and second embodiments because, whereas in the first and second embodiments, the destination channel information can be indicated by the transmission channel, in this embodiment, the frequency control channel CH31 is used to transmit the control signal, and therefore the destination channel must be indicated as an information signal.

[0131] By the way, at the stage in Figure 31, i.e., when terminal 63 transmits the G-ID and CH-CCR to other terminals 61, 62, 64, and 65 on CH28, if any of terminals 61, 62, 64, and 65 happens to be out of range or has its power turned off, that terminal will naturally not be able to receive the G-ID and CH-CCR and will not be able to respond to the change in network channel. For example, Figure 33 shows a case where terminal 65 is out of range at the stage shown in Figure 31, and terminals 61, 62, and 64 can receive G-DI and CH-CCR from terminal 63 using the receiving and demodulating unit RX1-SCAN and change their own communication channel to CH28, but terminal 65 misses this opportunity, and as shown in Figure 34, only terminal 65 remains on CH21 and becomes a deviated terminal. Therefore, even if the terminal 65 returns to the service area or is powered on, it will not be able to restore communication with the other terminals 61 to 64 and will not be able to return to the network.

[0132] In this case, terminals 61 to 64 cannot recognize that terminal 65 has deviated from the network simply because there continues to be no calls from terminal 65. Also, even though the currently set channel for terminal 65 remains CH21 and it continues to be in a state where it does not receive calls from other terminals 61 to 64, in a network with few calls it will take a considerable amount of time for terminal 65 to recognize that it has deviated from the network.

[0133] Therefore, the wireless communication device in this embodiment is applied to terminals 61 to 65 in the group wireless communication network, so that a terminal that has strayed can always automatically return to the network and regain a communicable state simply by returning to the range or turning the power back on within the range.

[0134] First, the wireless communication device of this embodiment (FIG. 1) executes the procedure shown in FIG. 35 in the group wireless communication mode. First, when the group wireless communication mode is set from the operation unit 19, the system control unit 10 resets the counter 21 and memory 22 (S91), and then checks whether the modulation transmission unit TX1 of the own terminal has transmitted the G-ID and CH-CCR, and whether the reception demodulation unit RX1-SCAN has received and demodulated the G-ID and CH-CCR from other terminals (S92, S93), and repeats the operation of incrementing the count value of the counter 21 by +1 each time this is detected (S94, S95 → S92).

[0135] Therefore, comparing the transitions in the network state (Figures 27 to 32), at the stage in Figure 31, terminal 63 transmits G-ID and CH-CCR using modulation transmission unit TX1-CH31, causing the count value of counter 21 of terminal 63 to be incremented by +1, and terminals 61, 62, 64, and 65 receive G-ID and CH-CCR using their respective reception demodulation units RX1-SCAN, causing the count value of counter 21 of each terminal 61, 62, 64, and 65 to be incremented by +1. However, as shown in Figure 33, when terminal 63 transmits G-ID and CH-CCR using modulation transmission unit TX1-CH31, terminal 65, which is located outside the service area or has its power turned off, is unable to receive the G-ID and CH-CCR, and therefore the count value of counter 21 is not incremented. That is, as shown in FIG. 34, the communication channel of terminal 65, which has become the deviated terminal, remains CH21, which is different from the communication channel CH28 of the other terminals 61, 62, 63, and 64, and the count value of counter 21 of terminal 65 is smaller than the count values ​​of counters 21 of the other terminals 61, 62, 63, and 64.

[0136] The wireless communication device of this embodiment, as a constituent terminal of a simplex wireless communication network, utilizes the difference in count values ​​that inevitably occurs in the execution procedure of Figure 35 when a stray terminal occurs, and executes the procedures shown in the flowcharts of Figures 36, 37A and 37B to automatically return the stray terminal to the network, regardless of whether it is from the same terminal or another party.

[0137] First, Figure 36 shows the procedure for the normal call transmission mode. When the PTT button on the operation unit 19 is turned ON to set the transmission mode in order to send a voice message from the reception mode to another terminal on the network (S100, S101), the reception demodulation unit RX1 executes CS on the currently set channel, and, provided that there is no interference, the modulation transmission unit TX1 transmits the G-ID, etc. (including the terminal's own ID, etc. in addition to the G-ID), and then modulates the carrier signal with the input voice signal from the microphone 15 to transmit the voice message (S102, S103). When the transmission is complete, the PTT button is turned OFF to cancel the transmission mode and transmit a communication end signal (S104, S105). This is a general operation executed as an interrupt process in the transmission mode of a wireless communication device, and does not include adding and transmitting count value information of memory 22 or detection time information to the end of the call signal, as shown in steps S14 to S16 of Figure 14 and steps S54 to S56 of Figure 21 in embodiments 1 and 2.

[0138] FIG. 37A shows the operation procedure of the wireless communication device of this embodiment, and in the reception mode, an interval timer (3 minutes) is always set (S110, S111). Then, if the receiving and demodulating unit RX1 does not receive and demodulate the G-ID on either the currently set channel (previous communication channel) or the frequency control channel CH31 within the 3-minute interval (S112:N → S115:N), a timeout occurs and the transmission mode is automatically set, an interrupt is generated, the modulation transmitting unit TX1 is changed from the currently set channel to CH31, and then the G-ID, currently set channel information, and count value information of the counter 21 are transmitted on the same channel CH31, and after transmitting a communication end signal, the modulation transmitting unit TX1 is returned from CH31 to the currently set channel and the interrupt processing is canceled (S116:Y → S117 to S119). This corresponds to a means for the device itself to inquire about the network side, since there is a possibility that a stray terminal has occurred in the network (particularly since there is a high possibility that the device itself is a stray terminal). Therefore, although not shown in Figure 37A, when a timeout occurs, the system control unit 10 may detect this and execute a procedure to display on the liquid crystal display unit 20 that the device has entered a deviated terminal state and / or a procedure to output a special electronic sound from the speaker 14 to notify the user of the terminal.

[0139] On the other hand, if the receiving and demodulating unit RX1 receives and demodulates the G-ID at the currently set channel (previous communication channel) stage during the cyclic scanning process within the 3-minute interval, it stops cyclic scanning at the currently set channel and plays back the received and demodulated call signal, and when the communication end signal is received and demodulated, it returns to cyclic scanning in the original receiving mode (S112: Y → S113, S114 → S110). This procedure is performed because the sender is another terminal that belongs to a group and is set to the same communication channel, and is the other terminal with which normal group communication should be performed. However, the currently set channel (communication channel) of the receiving terminal itself and the sender terminal is not necessarily a network channel, and both may be deviated terminals.

[0140] Furthermore, if the receiving and demodulating unit RX1 receives and demodulates the G-ID at the frequency control channel CH31 stage during the cyclic scanning process within the 3-minute interval, this indicates that the reception relates to information transmission based on the timeout by another terminal belonging to the group, or information transmission based on the comparison result of the count value information described below, and the channel information and count value information following the G-ID are received and demodulated and updated and stored in memory 22 (S115: Y → S120, S121).

[0141] Then, every time the channel information and count value information in memory 22 are updated, the count value information (M times) of counter 21 is compared with the updated count value information (N times) of memory 22, and appropriate processing is performed based on the result (S121, S122). This is similar to steps S29 and S30 in Figure 15A in the case of embodiment 1, and the count value information (N times) in memory 22 corresponds to the count value of the source terminal (i.e., a terminal that belongs to the group but has a different transmission and reception channel from the own terminal), and by comparing it with the count value information (M times) of the own terminal, it is determined which terminal has a higher estimated probability of being a deviating terminal, and appropriate processing is performed based on the comparison result.

[0142] The comparison results and corresponding processing procedure in this embodiment are shown in FIG. 37B and are as follows. If M>N: The transmission mode is automatically set and an interrupt is generated, the modulation transmission unit TX1 is changed from the currently set channel to CH31, and the G-ID, etc., the currently set channel information, and the count value information of the counter 21 (M times) are transmitted, and upon completion of this, the modulation transmission unit TX1 is changed from CH31 to the currently set channel and returns to the reception mode, thereby exiting the interrupt processing (S131 → S132 to S136). If N>M: The currently set channel of the own device is changed to the channel related to the updated channel information stored in the memory 22, and the count value information (M times) of the counter 21 is rewritten to the count value information (N times) of the memory 22 (S131 → S137 to S139). When M=N: No action is taken, and the channel of the transmitter and receiver is maintained as is (S131→S140).

[0143] The above has explained the function from the viewpoint of a single wireless communication device applied to a simplex group wireless communication network. Next, we will explain how to return a stray terminal 65 to the group network from a network state in which a stray terminal 65 has occurred, as shown in Figure 34.

[0144] FIG. 38 shows a case where a return sequence for stray terminal 65 to the network is executed with the start event being the transmission of required information by any of terminals 61 to 64 other than stray terminal 65 (terminal 61 in this case). First, as shown in the figure, the network channel is CH28, but the communication channel of the stray terminal 65 is CH21. Here, terminal 61 executes steps S117 to S119 according to the condition of steps S111, S112 → S115 → S116: Y (timeout) in Figure 37A, temporarily switches the modulation transmission unit TX1 from the currently set channel to CH31, and transmits the G-ID, the currently set channel information of the terminal itself, and the count value information of counter 21.

[0145] In response to this, the deviating terminal 65 executes S115:Y→S120 to S122 in Figure 37A, and when the G-ID etc. is received and demodulated during the scanning process of CH31 in the cyclic scanning [(1) in Figure 26] that prioritizes the frequency control channel CH31 of the receiving and demodulating unit RX1-SCAN, the scanning operation on CH31 is stopped, the channel information and count value information are received and demodulated, and these are updated and stored in memory 22, and the count value information (M) of the counter 21 of the own terminal is compared with the count value information (N) on the terminal 61 side in memory 22. The comparison result is that N>M because M is the count value of the deviating terminal 65, so in step S122 the deviating terminal 65 executes steps S131 → S137 to S139 of Figure 37B, the currently set channel is changed from CH21 to CH28, and the count value information (M) of the counter 21 of the own terminal is also rewritten to the count value (N) in memory 22.

[0146] For terminals 62, 63, and 64, S115 → S120 to S122 are executed to similarly compare the count value information (M) of the counter 21 of the own device with the count value information (N) of terminal 61 in memory 22, but since the communication channel between terminal 61 and terminals 62, 63, and 64 is network channel CH28, in step S122 the process shifts to step S131 → S140 in Figure 37B, no corresponding processing is performed, and the current state is maintained. As a result, as shown in FIG. 40, the currently set channels (communication channels) of all the terminals 61 to 65 are set to the network channel CH28, and the count value information of each of the terminals 61 to 65 is also set.

[0147] On the other hand, Figure 39 shows a case where the sequence for returning the stray terminal 65 to the network is executed with the stray terminal 65 transmitting the required information as the starting event, and in actual operation, this case is thought to be more common than the case of Figure 38. As shown in the figure, the network channel is CH28, and the communication channel of the stray terminal 65 is CH21, as in the case of FIG. Here, the deviated terminal 65 executes steps S117 to S119 according to the condition of steps S111, S112 → S115 → S116: Y (timeout) in Figure 37A, temporarily switches the modulation transmission unit TX1 from the currently set channel to CH31, and transmits the G-ID, the currently set channel information of the own terminal, and the count value information of the counter 21.

[0148] In response to this, terminals 61 to 64 execute steps S115 → S120 to S122 in Figure 37A, and when G-ID etc. are received and demodulated during the scanning process of CH31 in the cyclic scanning [(3) in Figure 26] in which CH31 is given priority by the receiving and demodulating unit RX1-SCAN, the scanning operation on CH31 is stopped, the channel information and count value information are received and demodulated, and these are updated and stored in memory 22, and the count value information (M) of the counter 21 of the own terminal is compared with the count value information (N) of the deviating terminal 65 in memory 22, and the corresponding processing is performed. 37A, the terminals 61 to 64 execute steps S131 → S132 to S136 in Fig. 37B, temporarily switch the modulation transmission unit TX1 from the currently set channel to CH31, and transmit the G-ID, their own currently set channel information, and the count value information of the counter 21. That is, in response to the transmission of their own information from the deviating terminal 65, the terminals 61 to 64 conversely return their own information. However, in this case, transmissions by terminals 61 to 64 on CH31 compete with each other, so only one of the terminals with which CS is established first (hereinafter referred to as terminal 6X) can transmit.

[0149] On the other hand, the deviated terminal 65 executes steps S115 → S120 to S122 in Figure 37A in response to the information transmission from terminal 6X, and receives and demodulates the channel information and count value information on the terminal 6X side in the same procedure as that executed by terminals 61 to 64 above, updates and stores them in memory 22, and compares the count value information (M) of its own counter 21 with the count value information (N) in memory 22 to perform corresponding processing. Therefore, the comparison result is that N>M since M is the count value information in the deviated terminal 65, and the deviated terminal 65 executes steps S131 → S137 to S139 in Figure 37B at step 122 in Figure 37A, and the currently set channel CH21 is changed to the channel indicated by the channel information in memory 22 (currently set channel CH28 on the terminal 5X side), thereby allowing the deviated state to return to the group network, and at the same time, the count value information (M) of counter 21 is also rewritten to the count value information (N) on the terminal 6X side in memory 22. As a result, as shown in FIG. 40, the currently set channels (communication channels) of all the terminals 61 to 65 are set to the network channel CH28, and the count value information of each of the terminals 61 to 65 is also set.

[0150] <<Embodiment 4>> As in the third embodiment, this embodiment relates to a group wireless communication network system having the wireless communication device of Figure 1 and its constituent terminals, and assumes a simplex group wireless communication network consisting of five terminals 61 to 65 as shown in Figure 27. The five channels selected as available for use in the network in this embodiment and the cyclic scanning conditions of the receiving and demodulating unit RX1-SCAN in each of the terminals 61 to 65 are also the same as those in the third embodiment. The causes of the occurrence of deviated terminals in this network are also similar to those explained in the third embodiment with reference to FIGS.

[0151] The difference between the wireless communication device of this embodiment and the wireless communication device of embodiment 3 is that, as a constituent terminal of a group wireless communication network, embodiment 3 uses the relative magnitude of the count value information of the number of times of transmission and reception of G-ID and CH-CCR as a comparison factor for the estimated probability of being a deviant terminal, whereas embodiment 3 uses the relative order of the latest detection time information related to transmission and reception of G-ID and CH-CCR as a comparison factor. This is based on the fact that a terminal with a later latest transmission / reception time of G-ID and CH-CCR has been in the network for a more recent period, and therefore can be considered to have a lower estimated probability of being a stray terminal.

[0152] Therefore, in the wireless communication device of embodiment 3, Figure 35 shows the procedure for detecting the transmission and reception of G-ID and CH-CCR and updating and storing the count value information of the number of times, while in this embodiment, Figure 41 shows the procedure for detecting the transmission and reception of G-ID and CH-CCR and updating and storing the detection time information. Specifically, when the group wireless communication mode is set from the operation unit 19, the system control unit 10 resets the memory 22 (S151), and then detects whether the modulation transmission unit TX1 of the own terminal has transmitted the G-ID and CH-CCR, and whether the reception / demodulation unit RX1-CH31 has received and demodulated the G-ID and CH-CCR from another terminal (S152, S153).Each time such detection is made, the system control unit 10 repeats the operation of updating and storing the time information of the built-in timer in the [A] area of ​​the memory 22 (S154, S155 → S152).

[0153] Furthermore, according to the method of updating and storing the transmission and reception times of the G-ID and CH-CCR in this embodiment, as in the case of embodiment 3, in a terminal that is capable of communicating in the group wireless communication network, the latest time information relating to the change of network channel based on the transmission and reception of the G-ID and CH-CCR is always updated and stored in the [A] area of ​​memory 22. However, in the case of a stray terminal that is out of range or has its power turned off when the G-ID and CH-CCR are transmitted and received, the record will no longer contain the latest time information.

[0154] The wireless communication device of this embodiment, as a constituent terminal of a simplex wireless communication network, utilizes the difference in time information in the [A] area of ​​memory 22 that inevitably occurs in the execution procedure of Figure 41 when a stray terminal occurs, and executes the procedures shown in the flowcharts of Figures 42, 43A and 43B to automatically return the stray terminal to the network, regardless of whether it is from the same terminal or another party.

[0155] Figure 42 shows the procedure for the normal call transmission mode, and is equivalent to Figure 36, but is included for the sake of functional integration. When the PTT button on the operation unit 19 is turned ON to set the transmission mode in order to send a voice message from the reception (standby) mode to another terminal on the network (S160, S161), the reception demodulation unit RX1 executes CS on the currently set channel, and, provided there is no interference, the modulation transmission unit TX1 transmits the G-ID, etc., and then modulates the carrier signal with the input voice signal from the microphone 15 to transmit the voice message (S162, S163).When the transmission is complete, the PTT button is turned OFF to cancel the transmission mode and transmit a communication end signal (S164, S165). This is a general operation executed as an interrupt process in the transmission mode of the wireless communication device, and as in the case of embodiment 3, the count value of memory 22 and detection time information are not added and transmitted at the end of the call signal as in embodiments 1 and 2.

[0156] FIG. 43A shows the operation procedure of the wireless communication device of this embodiment, and in the reception mode, an interval timer (3 minutes) is always set (S170, S171). If the receiving and demodulating unit RX1 does not receive and demodulate the G-ID on either the currently set channel (previous communication channel) or the frequency control channel CH31 within the 3-minute interval (S172:N → S175:N), a timeout occurs and the transmission mode is automatically set, an interrupt is generated, the modulation transmitting unit TX1 is changed from the currently set channel to CH31, and then the G-ID, currently set channel information, and detection time information in the [A] area of ​​memory 22 are transmitted on the same channel CH31, and after transmitting a communication end signal, the modulation transmitting unit TX1 is returned from CH31 to the currently set channel and the interrupt processing is canceled (S176:Y → S177 to S179). This corresponds to a means for the device itself to inquire about the network side, since there is a possibility that a stray terminal has occurred in the network (particularly since there is a high possibility that the device itself is a stray terminal). Therefore, although not shown in Figure 43A, when a timeout occurs, the system control unit 10 may detect this and execute a procedure to display on the liquid crystal display unit 20 that the device has entered a deviated terminal state and / or a procedure to output a special electronic sound from the speaker 14 to notify the user of the terminal.

[0157] On the other hand, if the receiving and demodulating unit RX1 receives and demodulates the G-ID at the currently set channel (previous communication channel) stage during the cyclic scanning process within the 3-minute interval, it stops cyclic scanning at the currently set channel and plays back the received and demodulated call signal, and when the communication end signal is received and demodulated, it returns to cyclic scanning in the original receiving mode (S172: Y → S173, S174 → S170). This procedure is performed because the sender is another terminal that belongs to a group and is set to the same communication channel, and is the other terminal with which normal group communication should be performed. However, the currently set channel (communication channel) of the receiving terminal itself and the sender terminal is not necessarily a network channel, and both may be deviated terminals.

[0158] Furthermore, if the receiving and demodulating unit RX1 receives and demodulates the G-ID at the frequency control channel CH31 stage during the cyclic scanning process within the 3-minute interval, this indicates that the reception relates to information transmission based on the timeout by another terminal belonging to the group, or information transmission based on the comparison result of the detection time information described below, and the channel information and detection time information following the G-ID are received and demodulated and updated and stored in the [B] area of ​​memory 22 (S175: Y → S180, S181).

[0159] Then, every time the channel information and detection time information in memory 22 are updated, the detection time information (T1) in area [A] of memory 22 is compared with the updated detection time information (T2) in area [B] of memory 22, and appropriate processing is performed based on the results (S181, S182). This is similar to steps S69 and S70 in Figure 22A in the case of embodiment 2, and the detection time information (T2) in the [B] area of ​​memory 22 corresponds to the detection time information of the source terminal (i.e., a terminal that belongs to a group but has a different transmission and reception channel from the own terminal), and by comparing this with the detection time information (T1) of the own terminal, it is determined which terminal has a higher estimated probability of being a deviating terminal, and appropriate processing is performed based on the comparison result.

[0160] The comparison results and corresponding processing procedure in this embodiment are shown in FIG. 43B and are as follows. If T1 is later than T2: The transmission mode is automatically set and an interrupt is generated, the modulation transmission unit TX1 is changed from the currently set channel to CH31, and the G-ID, etc., the currently set channel information, and the detection time information (T1) in the [A] area of ​​memory 22 are transmitted. Upon completion of this, the modulation transmission unit TX1 is changed from CH31 to the currently set channel and returns to the reception mode, thereby exiting the interrupt processing (S191 → S192 to S196). If T2 is later than T1: The currently set channel of the own device is changed to the channel related to the updated channel information stored in memory 22, and the detection time information (T1) in the [A] area of ​​memory 22 is rewritten to the detection time information (T2) in the [B] area of ​​memory 22 (S191 → S197 to S199). When T1 and T2 are simultaneous (T1=T2): No action is taken and the currently set channel is maintained as is (S191→S200).

[0161] The above has explained the function from the viewpoint of a single wireless communication device applied to a simplex group wireless communication network. Next, we will explain how to return a stray terminal 65 to the group network from a network state in which a stray terminal 65 has occurred, as shown in Figure 34.

[0162] FIG. 44 shows a case where a sequence for returning stray terminal 65 to the network is executed with the start event being the transmission of required information by any of terminals 61 to 64 other than stray terminal 65 (terminal 61 in this case). First, as shown in the figure, the network channel is CH28, but the communication channel of the stray terminal 65 is CH21. Here, terminal 61 executes steps S177 to S179 according to the condition of steps S171, S172 → S175 → S176: Y (timeout) in Figure 43A, temporarily switches the modulation transmission unit TX1 from the currently set channel to CH31, and transmits the G-ID, the currently set channel information of the terminal itself, and the detection time information in the [A] area of ​​memory 22.

[0163] In response to this, the deviating terminal 65 executes S175 → S180 to S182 in Figure 43A, and when the G-ID etc. is received and demodulated during the scanning process of CH31 in the cyclic scanning [(1) in Figure 26] that prioritizes the frequency control channel CH31 of the receiving and demodulating unit RX1-SCAN, the scanning operation on CH31 is stopped, the channel information and detection time information are received and demodulated, and these are updated and stored in the [B] area of ​​the memory 22, and the detection time information (T1) in the [A] area of ​​the memory 22 of the own terminal is compared with the detection time information (T2) in the [B] area. The comparison result is that T1 is the detection time information at the deviating terminal 65 and T2 is the detection time information at terminal 61, so that the relationship is "T2 is later than T1." Therefore, in step S182, the deviating terminal 65 executes steps S191 → S197 to S199 of Figure 43B, the currently set channel is changed from CH21 to CH28, and the detection time information (T1) in area [A] of the memory 22 of the own terminal is rewritten to the detection time information (T2) in area [B].

[0164] For terminals 62, 63, and 64, S175 → S180 to S182 are executed to similarly compare the detection time information (T1) in the [A] area of ​​their own memory 22 with the detection time information (T2) in the [B] area. However, since the communication channel between terminal 61 and terminals 62, 63, and 64 is network channel CH28, step S182 proceeds to step S191 → S200 in Figure 43B, no corresponding processing is performed, and the current state is maintained. As a result, the currently set channels (communication channels) of all the terminals 61 to 65 are set to the network channel CH28, and the count value information of each of the terminals 61 to 65 is also set.

[0165] On the other hand, Figure 45 shows a case where the sequence for returning the stray terminal 65 to the network is executed with the stray terminal 65 transmitting the required information as the starting event, and in actual operation, this case is thought to be more common than the case of Figure 44. As shown in the figure, the network channel is CH28, and the communication channel of the stray terminal 65 is CH21, as in the case of FIG. Here, the deviating terminal 65 executes steps S177 to S179 according to the condition of steps S171, S172 → S175 → S176: Y (timeout) in Figure 43A, temporarily switches the modulation transmission unit TX1 from the currently set channel to CH31, and transmits the G-ID, the currently set channel information of the own terminal, and the detection time information in the [A] area of ​​memory 22.

[0166] In response to this, terminals 61 to 64 execute steps S175 → S180 to S182 in Figure 43A, and when G-ID etc. are received and demodulated during the scanning process of CH31 in the cyclic scanning [(3) in Figure 26] that prioritizes CH31 of the receiving and demodulating unit RX1-SCAN, the scanning operation on CH31 is stopped, the channel information and the detection time information on the deviating terminal 65 side are received and demodulated, and these are updated and stored in the [B] area of ​​memory 22, and the detection time information (T1) in the [A] area of ​​memory 22 is compared with the detection time information (T2) in the [B] area. 43B, and temporarily switches the modulation transmission unit TX1 from the currently set channel to CH31, and transmits the G-ID, the currently set channel information of the own terminal, and the detection time information. That is, in response to the transmission of the own terminal information from the deviating terminal 65, the terminals 61 to 64 return their own terminal information. However, in this case, transmissions by terminals 61 to 64 on CH31 compete with each other, so only one of the terminals with which CS is established first (hereinafter referred to as terminal 6X) can transmit.

[0167] Meanwhile, the deviating terminal 65 executes steps S175 → S180 to S182 in Figure 43A in response to the transmission of its own information from terminal 6X, and receives and demodulates the channel information and detection time information from terminal 6X in the same procedure as that executed by terminals 61 to 64 above, updates and stores them in the [B] area of ​​memory 22, and compares its own detection time information (T1) in the [A] area of ​​memory 22 with the detection time information (T2) in the [B] area. Therefore, the comparison result is that T1 becomes the detection time information in the deviating terminal 65, resulting in a relationship of "T2 is later than T1", and steps S191 → S197 to S199 in Figure 43B are executed in the deviating terminal 65, and the currently set channel CH21 is changed to the channel indicated by the channel information in memory 22 (currently set channel CH28 on the terminal 6X side), thereby allowing the terminal to return to the group network from the deviating state, and at the same time, the detection time information (T1) of the terminal itself in area [A] of memory 22 is also rewritten to the detection time information (T2) on the terminal 6X side. [Industrial Applicability]

[0168] The present invention can be used in a simplex group radio communication network and the terminals that make up that network. [Explanation of symbols]

[0169] 10...system control unit, 11...antenna, 12...amplifier, 13...speaker, 15...microphone, 16...amplifier, 17...amplifier, 18...antenna, 19...operation unit, 20...liquid crystal display unit, 21...counter, 22...memory, RX1...receiving and demodulating unit, TX1...modulating and transmitting unit, 51-55...network constituent terminals (wireless communication devices), 61-65...network constituent terminals (wireless communication devices).

Claims

1. In a group wireless communication network system, a wireless communication device which is a terminal of a common configuration in a simplex group wireless communication network comprises a modulation / transmission unit and a reception / demodulation unit which cyclically scans all channels available in the network, and one terminal transmits a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CCR") on a designated change destination channel, while another terminal receives the G-ID and the CCR (hereinafter both signals are collectively referred to as "G-ID-CCR") during the scanning stage of the designated change destination channel by the reception / demodulation unit, thereby changing the network channel, Each terminal of the network has a function A that counts the number of times the G-ID and CCR are transmitted and received in an incremental manner and updates and stores the count value information; a function B that, in a transmission mode, adds and transmits the G-ID and a call signal together with the count value information of the terminal that has been updated and stored by the function A via a currently set channel that is the channel used in the previous communication; and a function B that, in a reception mode, when a signal including the G-ID is received and demodulated during the scanning stage of the currently set channel, receives and demodulates the call signal and plays back audio with the cyclic scanning on the same channel temporarily stopped, and when a signal including the G-ID is received and demodulated during the scanning stage of an available channel other than the currently set channel, receives and demodulates the call signal and plays back audio with the cyclic scanning on the same channel temporarily stopped. a function C for detecting count value information at the source terminal and updating and storing the same together with reception channel information; a function D for comparing the count value information (M times) of the device itself updated and stored by the function A with the count value information (N times) of the source terminal updated and stored by the function C each time the information is updated and stored by the function C; and a function E for automatically setting the transmission mode of the currently set channel and transmitting the G-ID and the count value information (M times) of the device itself when the result of the comparison by the function D is M>N, and for changing the currently set channel to the channel indicated by the reception channel information updated and stored by the function C, and for rewriting the count value information (M times) of the device itself to the count value information (N times) of the source terminal when M=N, and for maintaining the current state without performing any operation. A group wireless communication network system characterized in that each terminal in the network is executing function A, and when one terminal executes function B, the other terminals execute functions C, D, and E, and when M>N during the execution of function D, the other terminals send information using function E, and the one terminal executes functions C, D, and E.

2. 2. The group wireless communication network system according to claim 1, wherein the count value information of the terminal in function B of the network is transmitted by adding the count value information to the end of a voice signal portion of a communication frame.

3. In a group wireless communication network system, a wireless communication device which is a terminal of a common configuration in a simplex group wireless communication network comprises a modulation / transmission unit and a reception / demodulation unit which cyclically scans all channels available in the network, and one terminal transmits a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CCR") on a designated change destination channel, while another terminal receives the G-ID and the CCR (hereinafter both signals are collectively referred to as "G-ID-CCR") during the scanning stage of the designated change destination channel by the reception / demodulation unit, thereby changing the network channel, Each terminal of the network has a function A for updating and storing the detection time information when transmission / reception of the G-ID and CCR is detected, a function B for transmitting, in a transmission mode, the G-ID and a call signal together with the detection time information of the terminal itself, which has been updated and stored by the function A, via a currently set channel which is the channel used in the previous communication, and a function B for receiving and demodulating, in a reception mode, a signal including the G-ID during the scanning stage of the currently set channel, the call signal is received and demodulated with the cyclic scanning temporarily stopped on the same channel to play back the audio, and, on the other hand, when a signal including the G-ID is received and demodulated during the scanning stage of an available channel other than the currently set channel, the detection time information at the sending terminal included in the demodulated signal is received and demodulated with the cyclic scanning temporarily stopped on the same channel. and updates and stores the G-ID and the received channel information; and a function D, each time the information is updated and stored by the function C, compares the detected time information (T1) of the device itself updated and stored by the function A with the detected time information (T2) at the source terminal updated and stored by the function C; and, if the result of the comparison by the function D shows that T1 is later than T2, automatically sets the transmission mode of the currently set channel and transmits the G-ID and the detected time information (T1) of the device itself, and if T2 is later than T1, changes the currently set channel to the channel indicated by the received channel information updated and stored by the function C, and rewrites the detected time information (T1) of the device itself to the detected time information (T2) at the source terminal, and if T1 and T2 are simultaneous, performs no operation and maintains the current state. A group wireless communication network system characterized in that each terminal in the network is executing function A, and when one terminal executes function B, the other terminal executes functions C, D, and E, and when T1 is later than T2 in the execution of function D, the other terminal transmits information using function E, and the one terminal executes functions C, D, and E.

4. 4. A group wireless communication network system according to claim 3, wherein the detection time information of the terminal in function B of the network is transmitted by adding the information to the end of the audio signal portion of the communication frame.

5. A group wireless communication network system as described in claim 1, 2, 3 or 4, wherein the method of circular scanning of all channels available in the network by the receiving and demodulating unit is a method in which the scanning time for the currently set channel in the wireless communication device is set longer than the scanning time for each of the other channels.

6. 6. The group wireless communication network system according to claim 5, wherein the method of cyclic scanning of all channels available in the network by the receiving and demodulating unit is a method in which the currently set channel and one other channel are scanned alternately for the same period of time, and different channels are selected in sequence for the one other channel.

7. In a group wireless communication network system, a wireless communication device which is a terminal having a common configuration in a simplex group wireless communication network comprises a modulation / transmission unit and a reception / demodulation unit which cyclically scans a frequency control channel and all channels available in the network, and one terminal transmits a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CH-CCR") which specifies a channel to change to on the frequency control channel, while another terminal receives the G-ID and the CH-CCR (hereinafter both signals are collectively referred to as "G-ID-CH-CCR") during the scanning of the frequency control channel by the reception / demodulation unit, thereby changing the network channel, Each terminal of the network has a function A which counts the number of times the G-ID·CH-CCR is transmitted and received in an incremental manner and updates and stores the count value information; a function B which sets a normal transmission mode by a predetermined instruction operation and transmits the G-ID and a speech signal; a function C which, in a reception mode, when the reception demodulation unit does not detect a reception demodulation signal including the G-ID for a predetermined time, automatically sets a transmission mode in which the modulation transmission unit is temporarily switched from the currently set channel, which is the channel used in the previous communication (excluding the frequency control channel), to the frequency control channel, and transmits information related to the G-ID and the currently set channel (hereinafter referred to as "currently set channel information") and the count value information of its own terminal which has been updated and stored by function A, in a state in which the cyclic scanning is temporarily stopped in the reception mode, when the reception demodulation unit receives and demodulates a signal including the G-ID on the currently set channel, and receives and demodulates the speech signal to play audio, while temporarily stopping the cyclic scanning on the same channel, and a function D for detecting and updating currently set channel information and count value information at the transmitting terminal included in the demodulated signal while temporarily stopping the cyclic scanning on the channel when the signal including the G-ID is received and demodulated by the same channel; a function E for comparing the count value information (M times) of the transmitting terminal updated and stored by the function A with the count value information (N times) at the transmitting terminal updated and stored by the function D each time the information is updated and stored by the function D; and a function F for automatically setting a transmission mode in which the modulation transmitting unit is temporarily changed from the currently set channel to the frequency control channel when the result of the comparison by the function E is M>N, and transmitting the G-ID and the currently set channel information and count value information (M times) of the transmitting terminal; and for changing the currently set channel of the transmitting terminal to the currently set channel of the transmitting terminal when N>M, and rewriting the count value information (M times) of the transmitting terminal to the count value information (N times) at the transmitting terminal; and for maintaining the current state without performing any operation when M=N. A group wireless communication network system characterized in that each terminal of the network is executing function A and also executing function B as appropriate, and when one terminal executes function C, the other terminal executes functions D, E, and F, and when M>N during the execution of function E, the other terminal sends information using function F, and the one terminal executes functions D, E, and F.

8. 8. A group wireless communication network system according to claim 7, wherein function C of each terminal of the network further comprises, when the receiving and demodulating unit does not detect a receiving and demodulating signal including the G-ID for a predetermined time, an operation of displaying on a display means that the terminal is likely to be in a deviated terminal state and / or an operation of outputting a predetermined sound from an audio output means to notify that the terminal is in the deviated terminal state.

9. In a group wireless communication network system, a wireless communication device which is a terminal having a common configuration in a simplex group wireless communication network comprises a modulation / transmission unit and a reception / demodulation unit which cyclically scans a frequency control channel and all channels available in the network, and one terminal transmits a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CH-CCR") which specifies a channel to change to on the frequency control channel, while another terminal receives the G-ID and the CH-CCR (hereinafter both signals are collectively referred to as "G-ID-CH-CCR") during the scanning of the frequency control channel by the reception / demodulation unit, thereby changing the network channel, Each terminal of the network has a function A for updating and storing detection time information when transmission / reception of the G-ID·CH-CCR is detected, a function B for setting a normal transmission mode by a predetermined instruction operation and transmitting the G-ID and a speech signal, a function C for, in a reception mode, when the reception / demodulation unit does not detect a reception / demodulation signal including the G-ID for a predetermined time, automatically setting a transmission mode in which the modulation / transmission unit is temporarily switched from the currently set channel, which is the channel used in the previous communication (excluding the frequency control channel), to the frequency control channel, and transmitting information related to the G-ID and the currently set channel (hereinafter referred to as "currently set channel information") and the detection time information updated and stored by the function A, and a function C for, in a reception mode, when the reception / demodulation unit receives and demodulates a signal including the G-ID during a scanning step of the currently set channel, temporarily stopping the cyclic scanning on the same channel, receiving and demodulating the speech signal to play back the audio, while and a function D for detecting and updating currently set channel information and count value information at the transmitting terminal included in the demodulated signal while temporarily stopping the cyclic scanning on the channel, when the signal including the G-ID is received and demodulated, and updating and storing the detected time information; a function E for comparing the detected time information (T1) of the device itself updated and stored by the function A with the detected time information (T2) at the transmitting terminal updated and stored by the function D every time the information is updated and stored by the function D; and a function F for automatically setting a transmission mode in which the modulation transmitting unit is temporarily changed from the currently set channel to the frequency control channel when the result of the comparison by the function E is that T1 is later than T2, and transmitting the G-ID, the currently set channel information and detected time information (T1) of the device itself, and when T2 is later than T1, changing the currently set channel of the device itself to the currently set channel of the transmitting terminal, and rewriting the detected time information (T1) of the device itself to the detected time information (T2) at the transmitting terminal, and when T1 and T2 are simultaneous, maintaining the current state without performing any operation. A group wireless communication network system characterized in that each terminal of the network is executing function A and also executing function B as appropriate, and when one terminal executes function C, the other terminal executes functions D, E, and F, and when T1 is later than T2 in the execution of function E, the other terminal transmits information using function F, and the one terminal executes functions D, E, and F.

10. 10. A group wireless communication network system according to claim 9, wherein function C of each terminal of the network further comprises, when the receiving and demodulating unit does not detect a receiving and demodulating signal including the G-ID for a predetermined time, an operation of displaying on a display means that the terminal is likely to be in a deviated terminal state and / or an operation of outputting a predetermined sound from an audio output means to notify that the terminal is in the deviated terminal state.

11. 11. A group wireless communication network system according to claim 7, 8, 9 or 10, wherein the cyclic scanning method of the receiving and demodulating unit for the frequency control channel and all channels available in the network is a method in which the scanning time for the frequency control channel is set longer than the scanning time for each of the other channels.

12. 12. The group wireless communication network system according to claim 11, wherein the cyclic scanning method of the frequency control channel and all channels available in the network by the receiver / demodulator is a method in which the frequency control channel and one other channel are alternately scanned for the same period of time, and different channels are selected in sequence for the one other channel.

13. A wireless communication device as a terminal having a common configuration in a simplex group wireless communication network, comprising a modulation / transmission unit and a reception / demodulation unit that cyclically scans all channels available in the network, wherein the modulation / transmission unit transmits a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CCR") on a designated change destination channel, and the reception / demodulation unit receives the G-ID and the CCR (hereinafter both signals are collectively referred to as "G-ID-CCR") transmitted on a designated change destination channel from another terminal during the cyclic scanning process, thereby enabling a change of network channel; a counting and storing means for counting the number of times the G-ID and CCR are transmitted and received in an incremental manner and updating and storing the count value information; an information transmitting means for transmitting, in a transmission mode, the G-ID and a call signal together with the count value information of the own device which has been updated and stored in the count storage means, through a currently set channel which is the channel used in the previous communication; a speech reproduction means for receiving and demodulating a speech signal and reproducing the speech in a state where the cyclic scanning of the currently set channel is temporarily stopped when a signal including the G-ID is received and demodulated in the scanning stage of the currently set channel in a reception mode; In a receiving mode, when a signal including the G-ID is received and demodulated during a scanning stage of an available channel other than the currently set channel, information detection means detects count value information at the transmitting terminal included in the demodulated signal together with the receiving channel information, while temporarily stopping the cyclic scanning of the channel. an information storage means for updating and storing the reception channel information and count value information detected by the information detection means; a comparison means for comparing the count value information (M times) of the own device updated and stored by the count storage means with the count value information (N times) of the transmission source terminal updated and stored by the information storage means each time the information is updated and stored by the information storage means; As a result of the comparison by the comparison means, if M>N, the transmission mode of the currently set channel is automatically set and the G-ID and the count value information (M times) of the count storage means are transmitted, if N>M, the currently set channel is changed to the channel indicated by the receiving channel information of the information storage means, and the count value information (M times) of the count storage means is rewritten to the count value information (N times) of the information storage means, and if M=N, the corresponding processing means does nothing and maintains the current state. A wireless communication device comprising:

14. A wireless communication device as a terminal having a common configuration in a simplex group wireless communication network, comprising a modulation / transmission unit and a reception / demodulation unit that cyclically scans all channels available in the network, wherein the modulation / transmission unit transmits a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CCR") on a designated change destination channel, and the reception / demodulation unit receives the G-ID and the CCR (hereinafter both signals are collectively referred to as "G-ID-CCR") transmitted on a designated change destination channel from another terminal during the cyclic scanning process, thereby enabling a change of network channel; a time storage means for updating and storing detection time information when transmission / reception of the G-ID / CCR is detected; an information transmitting means for transmitting, in a transmission mode, the G-ID and the call signal together with the time information detected by the own device which has been updated and stored in the time storage means, via a currently set channel which is the channel used in the previous communication; a speech reproduction means for receiving and demodulating a speech signal and reproducing the speech in a state where the cyclic scanning of the currently set channel is temporarily stopped when a signal including the G-ID is received and demodulated in the scanning stage of the currently set channel in a reception mode; In a receiving mode, when a signal including the G-ID is received and demodulated during a scanning stage of an available channel other than the currently set channel, information detection means detects detection time information at the source terminal included in the demodulated signal together with the receiving channel information, while temporarily stopping the cyclic scanning of the channel. an information storage means for updating and storing the reception channel information and detection time information detected by the information detection means; a comparison means for comparing the detection time information (T1) at the own device updated and stored in the time storage means with the detection time information (T2) at the transmission source terminal updated and stored in the information storage means every time the information storage means updates and stores the information; a response processing means for automatically setting the transmission mode of the currently set channel to transmit the G-ID and the detected time information (T1) of the time storage means when the result of comparison by the comparison means shows that T1 is later than T2, and for changing the currently set channel to the channel indicated by the receiving channel information of the information storage means when T2 is later than T1, and for rewriting the detected time information (T1) of the time storage means to the detected time information (T2) of the information storage means when T1 and T2 are simultaneous, and for maintaining the current state without performing any action; A wireless communication device comprising:

15. A wireless communication device as a terminal having a common configuration in a simplex group wireless communication network, comprising a modulation / transmission unit and a reception / demodulation unit that cyclically scans a frequency control channel and all channels available in the network, wherein the modulation / transmission unit transmits a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CH-CCR") specifying a destination channel on the frequency control channel, and the reception / demodulation unit receives the G-ID and the CH-CCR (hereinafter both signals are collectively referred to as "G-ID-CH-CCR") transmitted on the frequency control channel from another terminal during the cyclic scanning process, thereby enabling a change of network channel, a counting and storing means for counting the number of times the G-ID·CH-CCR is transmitted and received in an incremental manner and updating and storing the count value information; a normal transmission means for setting a normal transmission mode in response to a predetermined instruction operation and transmitting the G-ID and a call signal; an information transmitting means for automatically setting a transmission mode in which the modulation transmitting means is temporarily switched from a currently set channel, which is a channel used in the previous communication (excluding a frequency control channel), to the frequency control channel when the receiving and demodulating means does not detect a received demodulated signal including the G-ID for a predetermined time in a receiving mode, and transmitting information relating to the G-ID and the currently set channel (hereinafter referred to as "currently set channel information") and count value information of the count storage means; a speech reproduction means for receiving and demodulating a speech signal and reproducing the speech in a state where the cyclic scanning is temporarily stopped on the currently set channel when the receiving and demodulating unit receives and demodulates a signal including the G-ID on the currently set channel in a reception mode; In a reception mode, when a signal including the G-ID is received and demodulated on the frequency control channel, information detection means detects currently set channel information and count value information at the source terminal included in the demodulated signal while temporarily stopping the cyclic scanning on the channel; an information storage means for updating and storing currently set channel information and count value information at the source terminal detected by the information detection means; a comparison means for comparing the count value information (M times) of the own device updated and stored by the count storage means with the count value information (N times) of the transmission source terminal updated and stored by the information storage means each time the information storage means updates and stores the information; As a result of the comparison by the comparison means, if M>N, a transmission mode is set in which the modulation transmission unit is temporarily changed from the currently set channel to a frequency control channel, and the G-ID, currently set channel information, and count value information (M times) of the count storage means are transmitted, and if N>M, the currently set channel is changed to a channel indicated by the receiving channel information of the information storage means, and the count value information (M times) of the count storage means is rewritten to the count value information (N times) of the information storage means, and if M=N, nothing is done and the current status is maintained; A wireless communication device comprising:

16. A wireless communication device as a terminal having a common configuration in a simplex group wireless communication network, comprising a modulation / transmission unit and a reception / demodulation unit that cyclically scans a frequency control channel and all channels available in the network, wherein the modulation / transmission unit transmits a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CH-CCR") specifying a destination channel on the frequency control channel, and the reception / demodulation unit receives the G-ID and the CH-CCR (hereinafter both signals are collectively referred to as "G-ID-CH-CCR") transmitted on the frequency control channel from another terminal during the cyclic scanning process, thereby enabling a change of network channel, a time storage means for updating and storing detection time information when transmission / reception of the G-ID / CCR is detected; a normal transmission means for setting a normal transmission mode in response to a predetermined instruction operation and transmitting the G-ID and a call signal; an information transmitting means for automatically setting a transmission mode in which the modulation transmitting means is temporarily switched from a currently set channel, which is a channel used in the previous communication (excluding a frequency control channel), to the frequency control channel when the receiving and demodulating unit does not detect a received demodulated signal including the G-ID for a predetermined time in a receiving mode, and transmitting information relating to the G-ID and the currently set channel (hereinafter referred to as "currently set channel information") and detection time information of the time storing means; a speech reproduction means for receiving and demodulating a speech signal and reproducing the speech in a state where the cyclic scanning is temporarily stopped on the currently set channel when the receiving and demodulating unit receives and demodulates a signal including the G-ID on the currently set channel in a reception mode; In a reception mode, when a signal including the G-ID is received and demodulated on the frequency control channel, information detection means detects currently set channel information and detection time information at the source terminal included in the demodulated signal while temporarily stopping the cyclic scanning on the same channel; an information storage means for updating and storing currently set channel information and detection time information of the source terminal detected by the information detection means; a comparison means for comparing the detection time information (T1) at the own device updated and stored by the time storage means with the detection time information (T2) at the transmission source terminal updated and stored by the information storage means every time the information storage means updates and stores the information; a response processing means for temporarily changing the modulation transmission unit from the currently set channel to a frequency control channel as a result of the comparison by the comparison means to a transmission mode where the modulation transmission unit is temporarily changed from the currently set channel to a frequency control channel, and transmitting the G-ID, the currently set channel information, and the detected time information (T1) of the time storage means, and for changing the currently set channel to a channel indicated by the receiving channel information of the information storage means, and for rewriting the detected time information (T1) of the time storage means to the detected time information (T2) of the information storage means, and for maintaining the current state without performing any action if T1 and T2 are simultaneous; A wireless communication device comprising:

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