Wireless communication network system and wireless communication device

Abstract

To allow a terminal to automatically return to a simplex wireless communication network (NW), by solving the problem in which when the terminal in the simplex wireless communication network (NW) is temporarily out of range or the like and the NW's channel in use is changed during that time, even if the terminal returns to range, the terminal cannot automatically return to the NW.SOLUTION: Each terminal includes a modulation transmission unit TX1 and reception demodulation units RX1, RX2, and in a reception mode RX2 scans all channels available in a network (NW). When the NW's channel in use is changed, each terminal transmits and receives a G-ID (Group Identification signal) and a CCR (Channel Change Request signal), and each terminal counts the number of times this occurs. When a call is made, each terminal also adds and transmits its own count value. When another terminal receives the G-ID and the count value only by RX2, each terminal compares its own count value information (M) with received count value information (N), and if M>N, transmits the G-ID and M on the current channel, if N>M, changes its own transmission and reception channel to the reception channel of RX2, and if M=N, maintains the current status.SELECTED DRAWING: Figure 16A

Description

[Technical field]

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

[0002] Simplex business radio communication devices are used outdoors at various construction sites and other work 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 specific low-power standard are designed to communicate voice 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] The following Non-Patent Document 1 specifies the type of radio waves, communication method, frequency used, and antenna power as technical conditions for the system related to the operation of the wireless communication device, and when the communication method is simplex, 20 channels are assigned, consisting of 11 channels with channel numbers CH20 to CH30, which are divided into 422.0500 to 422.1750 MHz at 12.5 kHz intervals, and 9 channels with channel numbers CH41 to CH49, which are divided into 422.2000 to 422.3000 MHz at 12.5 kHz intervals. In addition, channel number CH31 (422.1875 MHz) is assigned 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 channels, and communication is carried out through the selection of the available channel. However, as mentioned above, when wireless zones become dense, interference may occur midway, and when this causes disruption to business operations, it may be necessary to change the communication channel even while the network is in operation.

[0005] In this regard, many wireless communication devices available on the market are equipped with 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 other wireless communication devices function as receivers. In the transmitting wireless communication device, if the receiving and demodulating unit performs carrier sense and transmission is not possible, the channel is moved by one according to the channel number, etc., and carrier sense is performed, and this procedure is repeated until transmission is possible, and the transmission mode is entered on the channel where transmission is possible. Meanwhile, the receiving wireless communication device constantly scans all channels in the receiving and demodulating unit, and stops scanning and opens the audio playback circuit when a signal with a matching group code is received, and resumes scanning once reception is completed.

[0006] Furthermore, the following techniques have been proposed in patent documents: The following Patent Document 1 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, and 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 the channel to be used by the device to the available channel specified in the channel switching signal, and 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 by 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 by the channel switching signal.

[0007] The following Patent Document 2 discloses a system in which a wireless network is made up of sub-stations which perform data communication and a parent station which controls each of the sub-stations, in which the parent station judges the radio wave conditions of all available wireless channels at the time of startup and determines the optimal channel (the parent station transmits free channel information contained in a beacon), and periodically stops network transmission (the parent station transmits a monitoring beacon which prohibits the sub-stations from transmitting for a certain period of time), and each sub-station monitors the radio wave conditions in the vicinity in a dispersed manner (the sub-station which receives the monitoring beacon measures the received electric field strength during the transmission suspension period and transmits the results to the parent station to notify them), thereby selecting the optimal channel for the wireless network (the parent station selects the optimal channel based on the measurement results of the received electric field strength received from each sub-station, and transmits the optimal channel information contained in a beacon to each sub-station).

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

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

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

[0011] As described above, various proposals have been made regarding methods for changing communication channels in a group wireless communication network. However, there may be cases where a terminal (wireless communication device) is unable to participate in the communication channel change process for reasons such as being out of range when the network channel is changed or not being powered on. Such a terminal (hereinafter referred to as a "stray terminal") is unable to transition to the new communication channel after the change, and is therefore 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 stray terminal has been disconnected from the network, and the stray terminal is often unable to immediately confirm that it has been 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, 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>> The present invention relates to a wireless communication device, which is a terminal having a common configuration in a simplex group wireless communication network, comprising a transmitting / receiving section consisting of a modulation transmitting section and a first receiving / demodulating section, and a second receiving / demodulating section which cyclically scans all channels available in the network in a receiving mode, 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 destination channel, while another terminal transmits the G-ID and the CCR (hereinafter both signals are referred to as "G-ID" collectively) on the designated destination channel during the scanning stage of the designated destination channel by the second receiving / demodulating section. In a group wireless communication network in which a network channel is changed by receiving a G-ID·CCR, each terminal of the network has a function A for counting the number of times the G-ID·CCR is transmitted and received in an incrementing manner and updating and storing the count value information, a function B for adding the count value information of the own terminal to the G-ID and a call signal in a transmission mode and transmitting the signal, and a function C for transmitting the count value information of the own terminal when the second reception demodulation unit of the first and second reception demodulation units receives and demodulates a signal including the G-ID during a channel scanning process in a reception mode. A function C detects and updates the count value information of the transmission source terminal included in the demodulated signal together with the reception channel information in the second reception demodulation unit, and a function D compares the count value information (M times) of the own device with the count value information (N times) of the transmission source terminal each time the update and storage is performed in the reception mode, and when the result of the comparison is M>N, automatically sets the transmission mode while keeping the modulation transmission unit at the currently set channel, transmits the G-ID and the count value information (M times) of the own device, and when N>M, changes the channel of the transmission / reception unit to the updated and stored reception channel. and a function E of updating the count value information (M times) of the own terminal to the count value information (N times) of the source terminal and executing nothing when M=N, wherein each terminal of the network is executing the function A, and in response to execution of the function B by any one of the terminals, the other terminals execute the functions C, D, and E, and in the event that M>N occurs in the execution of the function D, the one terminal executes the functions C, D, and E in response to information transmission by the other terminal using the function E.

[0015] In this invention, 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 to return it to the network. Each terminal that makes up the network is equipped with a transceiver unit (a modulation transmission unit and a first reception / demodulation unit) as well as a second reception / demodulation unit, and in reception mode, the second reception / demodulation unit cyclically scans all channels available in the network.

[0016] In the event that interference occurs on the network channel currently in use, one terminal will transmit the G-ID·CCR on another available channel, while the other terminal will receive and demodulate it during the cyclic scanning process of the second receiving and demodulating section, and change its own transmitting and receiving channel to the channel on which the G-ID·CCR was received, thereby changing the network channel. Each terminal in the network detects each time the G-ID·CCR is transmitted / received based on function A, counts the number of times it is transmitted / received in an incremental manner, and updates and stores the count value information.

[0017] In addition, a terminal that has entered transmission mode to make a call transmits its own count value information to other terminals by adding the G-ID and call signal to the signal based on function B and sending it. In this case, the other terminal receives and demodulates the transmission signal of one terminal, but when it is received and demodulated by the first receiving and demodulating unit, the transmission and reception channels of both terminals are the same, and when it is not received by the first receiving and demodulating unit and is received and demodulated only by the second receiving and demodulating unit, the transmission and reception channels of both terminals are different.

[0018] Here, the fact that the transmission and reception channels of both terminals are the same corresponds to a state in which the transmission and reception units of both terminals are set to a network channel, or a state in which both terminals are stray terminals, provided that M and N described below are equal; the other terminals are not involved in these states, and simply reproduce the speech signal demodulated by the first reception and demodulation unit. On the other hand, if the transmission and reception channels of the terminals are different, it corresponds to a state in which one terminal is set to the network channel and the other terminal is a stray terminal, or a state in which both terminals are stray terminals, provided that M and N described below are different. The present invention takes account of this situation and implements an algorithm to return the stray terminal to the network channel.

[0019] First, based on function C, the second receiving and demodulating unit of another terminal (receiving terminal) receives and demodulates the count value information of one terminal (transmitting terminal) during its cyclic scanning process, and updates and stores the receiving channel information and count value information at that time. Then, based on function D, the other terminal (receiving terminal) compares its own count value information (M times) with the updated and stored count value information (N times) of the one terminal (sending terminal). In this case, the longer a terminal remains within the network, the larger the count value relating to the change of network channel will be; conversely, if there is a period of time that the terminal deviates from the network channel, the count value will tend to be smaller as the terminal will not be present when the network channel is changed. A terminal that has remained within the network without deviating will naturally have the largest count value, so it can be said that the larger the count value updated and stored in 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 it is a deviated terminal.

[0020] In the present invention, this situation is utilized rationally, and in the other terminal, the corresponding processing procedure is carried out according to the comparison result between M and N based on the function E as follows. If M>N, the other terminal (receiving terminal) has a higher estimated probability of being set to the current network channel than the one terminal (sending terminal), so the other terminal reverses the transmission / reception in order to change the channel set by the one terminal to its own channel, and the other terminal transmits (replies) the G-ID and count value information (M times) on its own currently set channel. The information transmitted from the other terminals is received and demodulated during the scanning process of the second receiving and demodulating section of each terminal in the network, but then, conversely, in one terminal which becomes the receiving terminal, the demodulated count value information (M times) is compared with the count value information (N times) of the own terminal based on functions C and D. In this case, from the perspective of the first terminal, the relationship between N and M is reversed in the corresponding process for the case where N>M described below, and based on function E, the transmission and reception channel of the first terminal is changed to the channel of the other terminal, and the count value information (N times) of the first 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 another terminal is in a network channel setting state, the transmitting / receiving unit of the one terminal is changed to the network channel and the one terminal can return to the network. On the other hand, if both terminals are deviant terminals, the count value information of the own terminal is adjusted to the set channel and count value information of the terminal with the larger count value information. From the network perspective, the response transmissions from multiple other terminals will overlap, but when carrier sense is required, only the terminal that is first enabled to transmit will be able to transmit a response.

[0021] When N>M, the opposite of the above, is that the one terminal (sending terminal) has a higher estimated probability of being set to the current network channel than the other terminal (receiving terminal), so the other terminal changes its own sending / receiving channel to the updated and stored receiving channel (the sending / receiving channel of the one terminal), and at the same time rewrites its own count value information (M times) to the one terminal's count value information (N times), thereby formally putting itself in the same history state as the one terminal. In other words, if the transmitter / receiver unit of one terminal (transmitting terminal) is in a network channel setting state and the other terminal (receiving terminal) is in a stray terminal state, the transmitter / receiver unit of the other terminal will be changed to the network channel and will be able to return to the network, and the count value information will be 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 have transmitted and received the same number of G-ID·CCRs. In the former case, there is no need to get involved, while 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, so in the end, no response processing will be done.

[0023] A 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. A wireless communication device having a common configuration as a terminal in a simplex group wireless communication network, the wireless communication device comprises a transmitting / receiving unit consisting of a modulation / transmission unit and a first reception / demodulation unit, and a second reception / demodulation unit which cyclically scans all channels available in the network in a reception mode, the wireless communication device transmitting 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 (both signals hereinafter collectively referred to as "G-ID·CCR") transmitted from another terminal on a designated change destination channel during the channel cyclic scanning process of the second reception / demodulation unit, the wireless communication device comprising: a counting storage means which counts the number of transmissions and receptions of the G-ID·CCR in an incrementing manner and updates and stores the count value information; an information transmitting means which, in a transmission mode, transmits the G-ID and a call signal by adding the count value information of the counting storage means; and, in a reception mode, a counting storage means which transmits the G-ID and a call signal by adding the count value information of the counting storage means. a comparison means for comparing the count value information (M times) of the count storage means with the count value information (N times) of the information storage means each time the information storage means updates and stores information; and, if the result of the comparison is M>N, automatically sets a transmission mode while keeping the modulation transmission unit at the currently set channel, and transmits the G-ID and the count value information (M times) of the own device, and if N>M, changes the channel of the transmission / reception unit to the reception channel of the information storage means, and rewrites the count value information (M times) of the count storage means to the count value information (N times) of the information storage means.

[0024] It is also preferable that the information transmitting means in the wireless communication device transmits the count value information of the count storage means in a manner that the count value information is added to the end of a speech signal frame.

[0025] <<Second Invention>> The present invention relates to a wireless communication device, which is a terminal having a common configuration in a simplex group wireless communication network, comprising a transceiver section consisting of a modulation transmission section and a first reception demodulation section, and a second reception demodulation section which cyclically scans all channels available in the network in a reception mode, 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 destination channel, while another terminal transmits the G-ID and the CCR (hereinafter both signals are referred to as "G-ID" collectively) during the scanning stage of the designated destination channel by the second reception demodulation section. In a group wireless communication network in which a network channel is changed by receiving a G-ID·CCR, each terminal of the network has a function A for updating and storing detection time information when transmission / reception of the G-ID·CCR is detected, a function B for adding the detection time information of the own terminal to the G-ID and a call signal in a transmission mode and transmitting the signal, and a function C for detecting a reception channel in the second reception / demodulation unit when only the second reception / demodulation unit of the first and second reception / demodulation units receives and demodulates a signal including the G-ID during a channel scanning process in a reception mode. a function C for detecting and updating and storing the detection time information of the transmission source terminal included in the demodulated signal together with the channel information; a function D for comparing the detection time information (T1) of the device with the detection time information (T2) of the transmission source terminal each time the update and storage is performed in the reception mode; and a function D for automatically setting the transmission mode while keeping the modulation transmission unit at the currently set channel when T1 is later than T2, transmitting the G-ID and the detection time information (T1) of the device, and when T2 is later than T1, changing the channel of the transmission / reception unit to the updated and stored reception channel and The group wireless communication network system is characterized in that it is provided with a function E which rewrites the detection time information (T1) to the detection time information (T2) of the sending terminal and executes nothing if T1 and T2 are simultaneous, each terminal of the network is executing the function A, and in response to execution of the function B by any one terminal, the other terminal executes the functions C, D, and E, and in that case, when T1 is later than T2 in the execution of the function D, the one terminal executes the functions C, D, and E in response to information transmission by the other terminal using the function E.

[0026] In this invention, like the first invention, each terminal (wireless communication device) that makes up the 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 to return it to the network. In addition, each terminal that makes up the network is equipped with a second receiving and demodulating unit in addition to a transmitting and receiving unit (a modulation transmitting unit and a first receiving and demodulating unit), and in receiving mode, the second receiving and demodulating unit cyclically scans all channels available in the network.Furthermore, similar to the first invention, in the event that interference occurs on a network channel in use, one terminal transmits a G-ID·CCR on another available channel, and the other terminal receives and demodulates it with the second receiving and demodulating unit, thereby changing the network channel to the channel on which the G-ID·CCR was received.

[0027] The difference between this second invention and the first invention is that each terminal detects when it transmits a G-ID·CCR or receives a G-ID·CCR from another terminal, and updates and stores the detection time information based on function A. In other words, instead of the number of times G-ID·CCR is sent and received as in the first invention, detection time information equivalent to a timestamp is used as a relative judgment factor related to the estimated probability of whether the transmitter / receiver of each terminal is the current network channel (the estimated probability of whether the terminal is a deviating terminal).

[0028] A terminal that goes into transmission mode to make a call transmits its own detection time information to other terminals by adding the detection time information of the terminal to the G-ID and call signal based on function A and transmitting the signal. In this case, the other terminal receives and demodulates the transmission signal of one terminal, but when it is received and demodulated by the first receiving and demodulating unit, the transmission and reception channels of both terminals are the same, and when it is not received by the first receiving and demodulating unit and is received and demodulated only by the second receiving and demodulating unit, the transmission and reception channels of both terminals are different. Here, the fact that the transmission and reception channels of both terminals are the same corresponds to a state in which the transmission and reception units of both terminals are set to a network channel, or a state in which both terminals are deviated terminals, provided that T1 and T2 described below are simultaneous; the other terminals are not involved in these states, and simply reproduce the speech signal demodulated by the first reception and demodulation unit.

[0029] On the other hand, if the transmitting and receiving channels of the terminals are different, it corresponds to a state in which one terminal is set to the network channel and the other terminal is a stray terminal, or a state in which both terminals are stray terminals, provided that T1 and T2, described below, are different. The present invention takes account of this situation and implements an algorithm to return the stray terminal to the network channel.

[0030] First, based on function C, the second receiving and demodulating unit of another terminal (receiving terminal) receives and demodulates the detection time information of the one terminal (transmitting terminal) during its cyclic scanning process, and updates and stores the receiving channel information and detection time information at that time. Then, based on function D, the other terminal (receiving terminal) compares its own detected time information (T1) with the updated and stored detected time information (T2) of the one terminal (sending terminal). In this case, it can be said that the later in time a terminal belongs to the network when the network channel is changed, the higher the estimated probability that it is set to the current network channel and the lower the estimated probability that it is a deviating terminal.

[0031] In the present invention, this situation is utilized rationally so that the other terminal executes the corresponding processing procedure based on function E as follows. If T1 is later than T2, there is a higher estimated probability that the other terminal (receiving terminal) is set to the current network channel than the one terminal (sending terminal), so the other terminal reverses the transmission / reception in order to change the channel set by the one terminal to its own channel, and the other terminal transmits (replies) its G-ID and its own detection time information (T1) on its own currently set channel. The information transmitted from the other terminals is received and demodulated during the scanning process of the second receiving and demodulating unit of each terminal in the network, but then the one terminal, which becomes the receiving terminal, compares the demodulated detection time information (T1) with its own detection time information (T2) based on functions C and D. In this case, when viewed from the first terminal, the corresponding process when T2 is later than T1 described below results in a reversed relationship between T2 and T1, and based on function E, the transmission and reception channel of the first terminal is changed to the channel of the other terminal, and the detection time information (T2) of the first terminal is also rewritten to the detection time information (T1) of the other terminal. Therefore, if one terminal is a stray terminal and the transmitting / receiving unit of another terminal is in a network channel setting state, the transmitting / receiving unit of the one terminal is changed to the network channel, and the one terminal can return to the network. On the other hand, if both terminals are deviant terminals, the detection time information of the own terminal will be aligned with the set channel and detection time information of the later terminal. From the network perspective, the response transmissions from multiple other terminals will overlap, but when carrier sense is required, only the terminal that is first enabled to transmit will be able to transmit a response.

[0032] If T2 is later than T1, then, conversely to the above, there is a higher estimated probability that the one terminal (receiving terminal) is set to the current network channel than the other terminal (sending terminal), so the other terminal changes its own transmitting / receiving channel to the updated and stored receiving channel (the transmitting / receiving channel of the one terminal), and at the same time rewrites its own detection time information (T1) to the detection time information (T2) of the one terminal, thereby formally putting itself in the same history state as the one terminal. In other words, if the transmitter / receiver unit of one terminal (transmitting terminal) is in a network channel setting state and the other terminal (receiving terminal) is in a stray terminal state, the transmitter / receiver unit of the other terminal will be changed to the network channel and will be able to return to the network, and the count value information will be formally aligned with that of the terminal that remained within the network.

[0033] 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 last transmission and reception times of the G-ID and CCR are the same. In the former case, there is no need to get involved, while 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, so in the end, no response processing will be done.

[0034] A 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 having a common configuration as a terminal in a simplex group wireless communication network, the wireless communication device comprises a transmitting / receiving unit consisting of a modulation / transmission unit and a first reception / demodulation unit, and a second reception / demodulation unit which cyclically scans all channels available in the network in a reception mode, 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 (both signals hereinafter collectively referred to as "G-ID·CCR") transmitted from another terminal on a designated change destination channel during the channel cyclic scanning process of the second reception / demodulation unit, thereby enabling a change of the network channel. The wireless communication device further comprises: a time storage means which updates and stores detection time information when transmission / reception of the G-ID·CCR is detected; an information transmission means which, in a transmission mode, transmits the G-ID and a call signal with the time information detected by the time storage means; and, in a reception mode, a transmission / reception unit which transmits the G-ID and a call signal with the time information detected by the time storage means. a comparison means for comparing the detected time information (T1) of the time storage means with the detected time information (T2) of the information storage means each time the information storage means updates and stores information on the detected channel information and the detected time information (T2) of the information storage means; and a processing means for automatically setting a transmission mode while keeping the modulation transmission unit at the currently set channel, and transmitting the G-ID and the detected time information (T1) of the time storage means, when the result of the comparison shows that T1 is later than T2, and for changing the channel of the transmission / reception unit to the receiving channel of the information storage means, and for rewriting the detected time information (T1) of the time storage means with the detected time information (T2) of the information storage means, when T2 is later than T1, for changing the channel of the transmission / reception unit to the receiving channel of the information storage means, and for rewriting the detected time information (T1) of the time storage means with the detected time information (T2) of the information storage means.

[0035] It is also preferable that the information transmitting means in the wireless communication device is a means for transmitting the detected time information of the time storage means in such a manner that the detected time information is added to the end of a speech signal frame.

[0036] <<Third Invention>> The present invention relates to a group wireless communication network in which a wireless communication device, which is a terminal of a common configuration in a simplex group wireless communication network, comprises a transmitting / receiving section consisting of a modulation / transmission section and a first receiving / demodulating section, and a second receiving / demodulating section set to a frequency control channel, and in which a network channel is changed by one terminal transmitting a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CH-CCR") accompanied by a change 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") with the second receiving / demodulating section, each terminal of the network has a function A for counting the number of times the G-ID·CH-CCR is transmitted and received in an incrementing manner and updating and storing the count value information, a function B for setting a normal transmission mode by a predetermined instruction operation and transmitting the G-ID and a speech signal, and a function C for temporarily switching the transmission / reception mode to the normal transmission mode when a reception / demodulation signal including the G-ID is not detected for a predetermined time from either the first or second receiving / demodulating section in the reception mode. a function C for setting an automatic transmission mode in which the demodulator is switched from the currently set channel to the frequency control channel, and transmitting the G-ID, the currently set channel information, and the count value information; a function D for detecting the currently set channel information and the count value information of the transmission source terminal contained in the demodulated signal when only the second reception demodulator of the first and second reception demodulators receives and demodulates the signal containing the G-ID in a reception mode, and updating and storing the detected currently set channel information and the count value information each time the update and storage is performed in the reception mode; a function E for comparing count value information (N times) of a source terminal with the count value information (N times) of the source terminal; and a function F for, when the result of the comparison is M>N, temporarily changing the modulation transmission unit from a currently set channel to a frequency control channel to transmit the G-ID, the currently set channel information of the device itself, and the count value information (M times), when N>M, changing the channel of the transmission / reception unit to the currently set channel of the source terminal, and rewriting the count value information (M times) of the device itself to the count value information (N times) of the source terminal, and when M=N, not executing anything;The present invention relates to a group wireless communication network system, characterized in that each terminal in 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 terminal executes the functions D, E, and F, and when M>N occurs in 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 in function F.

[0037] In this invention, like the first and second inventions, each terminal (wireless communication device) that makes up the 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 to return it to the network. Also, as in the first and second inventions, each terminal constituting the network is equipped with a second receiving and demodulating unit in addition to a transmitting and receiving unit (a modulation transmitting unit and a first receiving and demodulating unit); however, this invention differs from the above-mentioned inventions in that the second receiving and demodulating unit is set to a frequency control channel. Therefore, in the third invention, the frequency control channel is always used in transmitting and receiving control information signals in the network.

[0038] In this invention, if interference occurs on a network channel in use, one terminal transmits a G-ID·CH-CCR on the frequency control channel, while another terminal receives and demodulates it in a second receiving and demodulating unit and changes its own transmitting and receiving channel to the channel specified by the CH-CCR, thereby changing the network channel.Each terminal in the network detects each transmission / reception of a G-ID·CH-CCR, and counts the number of transmissions and receptions in an incremental manner based on function A, and updates and stores the count value information. In this regard, too, there is a difference between CCR and CH-CCR, that is, whether or not the channel change request signal indicates the destination channel, but the network channel changing system is the same as that of the first invention.

[0039] On the other hand, based on function B, each terminal transmits the G-ID and call signal in normal communication mode by operating the PTT button, etc., but also, based on function C, if a G-ID reception demodulation signal is not detected for a predetermined time from either the first or second reception demodulation unit in reception mode, that is, if there is no reception from other terminals in the group for a predetermined continuous time, the terminal 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 own 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.

[0040] In the first and second inventions, the second receiving and demodulating section is of a channel scanning type, so that the system transmits the required information to each terminal each time a call signal is transmitted, but in this invention, a frequency control channel that is frequently used in specific low-power radio is utilized, so that the count value information is transmitted only under conditions in which the occurrence of a stray terminal is predicted. In addition, the information transmitted includes not only the count value information but also the currently set channel information of the own terminal. This is because, as in the first and second inventions, the second receiving and demodulating unit of each terminal receives using a channel scanning method, so the receiving channel is directly the currently set channel information of the transmitting terminal, whereas in this invention, the second receiving and demodulating unit of each terminal is set to the frequency control channel, and so it is necessary to show this information specifically.

[0041] Then, when a terminal that has not received any signals from other terminals in the group for a predetermined continuous period of time transmits a G-ID, currently set channel information, and the count value information, the other terminals will receive and demodulate the signal transmitted by the first terminal. When the signal is received and demodulated by the first receiving and demodulating unit, the transmitting and receiving channels of both terminals are the same, but when the signal is not received by the first receiving and demodulating unit and is received and demodulated only by the second receiving and demodulating unit, the transmitting and receiving channels of both terminals are different.

[0042] Here, the fact that the transmission and reception channels of both terminals are the same corresponds to a state in which the transmission and reception units of both terminals are set to a network channel, or a state in which both terminals are deviated terminals, provided that M and N described below are equal; the other terminals are not involved in these states, and simply reproduce the speech signal demodulated by the first reception and demodulation unit. On the other hand, if the transmission and reception channels of the terminals are different, it corresponds to a state in which one terminal is set to the network channel and the other terminal is a stray terminal, or a state in which both terminals are stray terminals, provided that M and N described below are different. The present invention takes note of that condition and implements an algorithm to return the stray terminal to the network channel.

[0043] First, in another terminal that receives a signal such as the G-ID from a first terminal, based on function D, a second receiving and demodulating unit receives and demodulates the currently set channel information and count value information of the first terminal contained in the received signal, and updates and stores them. Then, based on function E, the other terminal compares its own count value information (M times) with the updated and stored count value information (N times) on the one terminal side. In this case, the longer a terminal remains within the network, the larger the count value relating to the change of network channel will be, and conversely, if the terminal deviates from the network channel for a long period of time, the count value will tend to be smaller as the terminal will not be present when the network channel is changed. Since a terminal that has remained within the network without straying will naturally store the maximum 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 it is a stray terminal.

[0044] In the present invention, this situation is utilized rationally so that the other terminal executes the corresponding processing procedure based on the function F as follows. When M>N, the other terminal has a higher estimated probability of being set to the current network channel than the one terminal, so in order to change the set channel of the one terminal to its own channel, the other terminal sets an automatic transmission mode in which the transmission modulation unit is temporarily switched from the currently set channel to the frequency control channel, and transmits the G-ID, its own currently set channel information, and count value information (M times). Then, the information transmitted from the other terminals is received and demodulated by a second receiving and demodulating unit of each terminal in the network, and in the one terminal, the demodulated count value information (M times) is compared with the terminal's own count value information (N times) based on functions D and E. In this case, when viewed from the first terminal, the relationship between N and M is reversed in the corresponding process for the case where N>M described below, and based on function F, the transmission and reception channel of the first terminal is changed to the currently set channel information of the other terminal, and the count value information (N times) of the first 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 another terminal is in a network channel setting state, the transmitting / receiving unit of the one terminal is changed to the network channel, and the one terminal can return to the network. On the other hand, if both terminals are stray terminals, the count value information of the own terminal will be aligned with the setting channel and count value information of the terminal with the larger count value information, but this in itself does not contribute to returning to the network. From the network perspective, the response transmissions from multiple other terminals will overlap, but only the terminal that is first enabled to transmit by carrier sense on the frequency control channel will be able to transmit the response.

[0045] When N>M, the opposite of the above is true: the first terminal has a higher estimated probability of being set to the current network channel than the other terminals. Therefore, the other terminals use the information they have received, demodulated, and updated to change their own transmission / reception channel to the currently set channel of the first terminal, and also rewrite their own count value information (M times) to the count value information of the first terminal (N times), thereby formally putting themselves in the same history state as the first terminal.

[0046] The case of N=M corresponds to the case where the currently set channels of one terminal and another terminal are both network channels, or the case 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 get involved, but 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 done.

[0047] A 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 terminal having a common configuration in a simplex group wireless communication network is provided with a transceiver unit consisting of a modulation transmission unit and a first reception / demodulation unit, and a second reception / demodulation unit set to a frequency control channel, and 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 change destination channel designation on the frequency control channel, while the second reception / demodulation unit receives the G-ID and the CH-CCR (hereinafter both signals are collectively referred to as "G-ID·CCR") transmitted on the frequency control channel from another terminal, and a count storage means for counting the number of times the G-ID·CH-CCR is transmitted and received in an incrementing 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 speech signal; an information transmission means for setting an automatic transmission mode in which the transmission modulation means is temporarily switched from a currently set channel to the frequency control channel when a reception demodulation signal including the G-ID is not detected for a predetermined time from either the first or second reception demodulation means in the reception mode, and causing the transmission modulation means to transmit the G-ID, the currently set channel information, and the count value information of the count storage means; an information detection means for detecting currently set channel information and count value information of a transmission source terminal included in a demodulated signal when only the second reception demodulation means of the first and second reception demodulation means receives and demodulates a signal including the G-ID in the reception mode; and an information storage means for updating and storing the currently set channel information and count value information of the transmission source terminal detected by the information detection means. a comparison means for comparing the count value information (M times) of the count storage means with the count value information (N times) of the information storage means each time information is updated and stored in the information storage means, and if the result of the comparison is M>N, setting a transmission mode in which the modulation transmission unit is temporarily changed from a currently set channel to a frequency control channel, transmitting the G-ID, the currently set channel information of the transmission / reception unit, and the count value information (M times) of the count storage means, and if N>M, changing the channel of the transmission / reception unit to the currently set channel of the information storage means,and a corresponding processing means for rewriting the count value information (M times) of the count storage means to the count value information (N times) of the information storage means.

[0048] <<The fourth invention>> A fourth invention relates to a group wireless communication network in which a wireless communication device, which is a terminal of a common configuration in a simplex group wireless communication network, comprises a transmitting / receiving unit consisting of a modulation / transmission unit and a first receiving / demodulating unit, and a second receiving / demodulating unit set to a frequency control channel, and in which a network channel is changed by one terminal transmitting a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CH-CCR") accompanied by a change 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") with the second receiving / demodulating unit, 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, and a function C for temporarily switching the transmission / modulation unit from a currently set channel to a new channel when a reception / demodulation signal including the G-ID is not detected from either the first or second receiving / demodulating unit for a predetermined time in the reception mode. A function C sets an automatic transmission mode switched to the frequency control channel and transmits the G-ID, the currently set channel information, and the detection time information; in a reception mode, when only the second reception demodulation unit of the first and second reception demodulation units receives and demodulates a signal including the G-ID, a function D detects the currently set channel information and the detection time information of the transmission source terminal included in the demodulated signal, and updates and stores the detection time information (T1) of the own device and the detection time information (T2) of the transmission source terminal each time the update and storage is performed in the reception mode. and a function F which, if the result of the comparison shows that T1 is later than T2, sets a transmission mode in which the modulation transmission unit is temporarily changed from a currently set channel to a frequency control channel, and transmits the G-ID, the currently set channel information of the own device, and the detection time information (T1), and, if T2 is later than T1, changes the currently set channel of the transmission / reception unit to the currently set channel of the source terminal, and rewrites the detection time information (T1) of the own device to the detection time information (T2) of the source terminal, and, if T1 and T2 are simultaneous, does nothing;The present invention relates to a group wireless communication network system, characterized in that each terminal in 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 terminal executes the functions D, E, and F, and when T1 is later than T2 in the execution of the function E, the one terminal executes the functions D, E, and F in response to information transmission in function F by the other terminal.

[0049] In this invention, like the first and second inventions, each terminal (wireless communication device) that makes up the 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 to return it to the network. Also, as in the first and second inventions, each terminal constituting the network is equipped with a second receiving and demodulating unit in addition to a transmitting and receiving unit (a modulation transmitting unit and a first receiving and demodulating unit); however, this invention differs from the above-mentioned inventions in that the second receiving and demodulating unit is set to a frequency control channel. Therefore, in the fourth aspect of the invention, the frequency control channel is always used in transmitting and receiving control information signals in the network.

[0050] In this invention, if interference occurs on a network channel in use, one terminal transmits a G-ID·CH-CCR on the frequency control channel, while another terminal receives and demodulates it in a second receiving and demodulating unit and changes its own transmitting and receiving channel to the channel specified by the CH-CCR, thereby changing the network channel.Each terminal in the network detects each time a G-ID·CH-CCR is transmitted / received, and updates and stores the detection time information based on function A. In this regard, too, there is a difference between CCR and CH-CCR, that is, whether or not the channel change request signal indicates the destination channel, but the network channel changing system is the same as that of the second invention.

[0051] On the other hand, based on function B, each terminal transmits the G-ID and call signal in normal communication mode by operating the PTT button, etc., but also, based on function C, if a G-ID reception demodulation signal is not detected for a predetermined time from either the first or second reception demodulation unit in reception mode, that is, if there is no reception from other terminals in the group for a predetermined continuous time, the terminal 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 latest detection time information related to the transmission and reception of G-ID·CH-CCR in the terminal itself) 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.

[0052] In the first and second inventions, the second receiving and demodulating unit is of a channel scanning type, so that the system transmits the required information and transmits it to each terminal each time a call signal is transmitted. However, in this invention, a frequency control channel that is frequently used in specific low-power radio is utilized, so that the detection time information is transmitted only under conditions in which the occurrence of a stray terminal is predicted. In addition, the transmitted information includes not only the detection time information but also the currently set channel information of the own terminal. This is because, as in the first and second inventions, the second receiving and demodulating unit of each terminal receives using a channel scanning method, so the receiving channel is directly the currently set channel information of the transmitting terminal, whereas in this invention, the second receiving and demodulating unit of each terminal is set to the frequency control channel, so it is necessary to show this as specific information.

[0053] Then, when a terminal that has not received any signal from other terminals in the group for a predetermined continuous period of time transmits a G-ID, currently set channel information, and the detection time information, the other terminals will receive and demodulate the signal transmitted by the first terminal. When the signal is received and demodulated by the first receiving and demodulating unit, the transmitting and receiving channels of both terminals are the same, but when the signal is not received by the first receiving and demodulating unit and is received and demodulated only by the second receiving and demodulating unit, the transmitting and receiving channels of both terminals are different.

[0054] Here, the fact that the transmitting and receiving channels of both terminals are the same corresponds to a state in which the transmitting and receiving units of both terminals are set to the network channel, or a state in which both terminals are deviated terminals, provided that T1 and T2 described below are equal; the other terminals are not involved in these states, and simply reproduce the speech signal demodulated by the first receiving and demodulating unit. On the other hand, if the transmission and reception channels of the terminals are different, it corresponds to a state in which one terminal is set to the network channel and the other terminal is a stray terminal, or a state in which both terminals are stray terminals, provided that M and N described below are different. The present invention takes note of that condition and implements an algorithm to return the stray terminal to the network channel.

[0055] First, in another terminal that receives a signal such as the G-ID from a first terminal, based on function D, a second receiving and demodulating unit receives and demodulates the currently set channel information and detection time information of the first terminal contained in the received signal, and updates and stores them. Then, based on function E, the other terminal compares its own detected time information (T1) with the updated and stored detected time information (T2) on the one terminal side. In this case, it can be said that the later in time a terminal belongs to the network when the network channel is changed, the higher the estimated probability that it is set to the current network channel and the lower the estimated probability that it is a deviating terminal.

[0056] In the present invention, this situation is utilized rationally so that the other terminal executes the corresponding processing procedure based on the function F as follows. If T1 is later than T2, there is an estimated higher probability that the other terminal is set to the current network channel than the one terminal, so in order to change the set channel of the one terminal to its own channel, the other terminal sets an automatic transmission mode in which the transmission modulation unit is temporarily switched from the currently set channel to the frequency control channel, and transmits the G-ID, its own currently set channel information, and detection time information (T1). Then, the information transmitted from the other terminals is received and demodulated by a second receiving and demodulating unit of each terminal in the network, and in the one terminal, the demodulated detection time information (T1) is compared with the detection time information (T2) of the terminal itself based on functions D and E. In this case, from the perspective of the first terminal, the relationship between T1 and T2 is reversed in the corresponding process when T1 is later than T2 described below, and based on function F, the transmission and reception channel of the first terminal is changed to the currently set channel information of the other terminal, and the detection time information (T2) of the first terminal is also rewritten to the detection time information (T1) of the other terminal. Therefore, if one terminal is a stray terminal and the transmitting / receiving unit of another terminal is in a network channel setting state, the transmitting / receiving unit of the one terminal is changed to the network channel, and the one terminal can return to the network. On the other hand, if both terminals are stray terminals, the count value information of the own terminal will be aligned with the setting channel and count value information of the terminal with the larger count value information, but this in itself does not contribute to returning to the network. From the network perspective, the response transmissions from multiple other terminals will overlap, but only the terminal that is first enabled to transmit by carrier sense on the frequency control channel will be able to transmit the response.

[0057] If T2 is later than T1, then, conversely to the above, the estimated probability that the first terminal is set to the current network channel is higher than that of the other terminal, so the other terminal uses the information it has received, demodulated, and updated and stored to change its own transmission / reception 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.

[0058] 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 latest detection times for sending and receiving G-ID·CH-CCR are the same. In the former case, there is no need to get involved, 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.

[0059] A 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 terminal having a common configuration in a simplex group wireless communication network is provided with a transmitting / receiving unit consisting of a modulation transmitting unit and a first reception demodulation unit, and a second reception demodulation unit set to a frequency control channel, and the modulation transmitting 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 change destination channel designation on the frequency control channel, while the second reception demodulation unit receives the G-ID and the CH-CCR (hereinafter both signals are collectively referred to as "G-ID·CH-CC") transmitted on the frequency control channel from another terminal, and a time storage means for updating and storing detection time information when transmission / reception of the G-ID·CH-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 speech signal; an information transmission means for setting an automatic transmission mode in which the transmission modulation means is temporarily switched from a currently set channel to the frequency control channel when a reception demodulation signal including the G-ID is not detected for a predetermined time from either the first or second reception demodulation means in the reception mode, and causing the transmission modulation means to transmit the G-ID, the currently set channel information, and the detection time information of the time storage means; an information detection means for detecting and updating currently set channel information and detection time information of a transmission source terminal included in a demodulated signal when only the second reception demodulation means of the first and second reception demodulation means receives and demodulates a signal including the G-ID in the reception mode; a comparison means for comparing the detected time information (T1) of said time storage means with the detected time information (T2) of said information storage means each time storage is performed, and if the result of said comparison shows that T1 is later than T2, a transmission mode is set in which said modulation transmission unit is temporarily changed from a currently set channel to a frequency control channel, and said G-ID, the currently set channel information of said transmission / reception unit, and the detected time information (T1) of said time storage means are transmitted, and if T2 is later than T1, the currently set channel of said transmission / reception unit is changed to the currently set channel of the transmission source terminal stored in said information storage means,and a corresponding processing means for rewriting the detection time information (T1) of the wireless communication device to the detection time information (T2) of the transmission source terminal.

[0060] In addition, with respect to a wireless communication device applicable to the group wireless communication network system according to the third and fourth inventions, it is desirable to provide a display control means for causing a display means to display the fact that the device is likely to be in a deviated terminal state when, in a receiving mode, a receiving demodulation signal including the G-ID is not detected from either the first or second receiving and demodulating unit for a predetermined period of time, and / or an audio output control means for notifying that the device is in the said state by outputting a predetermined sound from an audio output means. Effect of the Invention

[0061] 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 in use in the network is changed because they are out of range or their power is turned off, 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 specified algorithm using this information is executed during communication, automatically switching the sending and receiving channel of the terminal that has strayed from the network to the channel currently in use in the network, enabling the terminal to quickly and smoothly return to the network. [Brief description of the drawings]

[0062] [Figure 1A] 1 is a block diagram of a wireless communication device according to first and second embodiments. [Figure 1B] FIG. 11 is a block diagram of a wireless communication device according to a third and fourth embodiment. [Diagram 2] This is a list of frequencies and their channel numbers that specific low-power radio stations can use for simplex wireless communication. [Diagram 3] 1 is an example of a communication frame format diagram used in a group wireless communication network. [Figure 4]FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Diagram 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] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 14] 5 is a flowchart showing a procedure for counting the number of detections relating to transmission and reception of a G-ID·CCR (group identification signal·channel change request signal) by a wireless communication device that is a constituent terminal of a network in the first embodiment. [Figure 15] 5 is a flowchart showing an operation execution procedure in a transmission mode by a wireless communication device that is a constituent terminal of a network in the first embodiment. [Figure 16A] 1 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 (in step S30, there is an interrupt process in an automatic transmission mode). [Figure 16B] 16B is a flowchart showing details of the operation execution procedure in step S30 of FIG. 16A. [Figure 17]FIG. 2 is a simplified configuration diagram of a network showing a starting 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 18] FIG. 1 is a simplified configuration diagram of a network showing a starting state when a stray terminal is automatically returned to the network using a transmission from the stray terminal as a starting event in embodiment 1. [Figure 19] 11 is a flowchart showing a procedure for updating and storing detection time information relating 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 20] 11 is a flowchart showing the operation execution procedure in a transmission mode by a wireless communication device that is a constituent terminal of a network in the second embodiment. [Figure 21A] 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 second embodiment (step S70 includes an interrupt process in an automatic transmission mode). [Figure 21B] 21B is a flowchart showing details of the operation execution procedure in step S70 of FIG. 21A. [Figure 22] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Diagram 23] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 24] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Diagram 25] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 26] FIG. 1 is a simplified configuration diagram of a simplex group wireless communication network. [Figure 27] 13 is a flowchart showing a procedure for counting the number of detections relating to transmission and reception of G-ID·CH-CCR (group identification signal·channel change request signal with destination channel designation) by a wireless communication device that is a constituent terminal of a network in embodiment 3. [Figure 28]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 29A] 13 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 S70). [Figure 29B] 29B is a flowchart showing details of the operation execution procedure in step S122 of FIG. 29A. [Diagram 30] FIG. 11 is a simplified configuration diagram of a network showing a starting 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. [Diagram 31] FIG. 11 is a simplified configuration diagram of a network showing the starting state when a stray terminal is automatically returned to the network using a transmission from the stray terminal as a starting event in embodiment 3. [Diagram 32] 13 is a flowchart showing a procedure for updating and storing detection time information relating to transmission and reception of G-ID·CH-CCR by a wireless communication device that is a constituent terminal of a network in the fourth embodiment. [Diagram 33] 13 is a flowchart showing an operation execution procedure in a transmission mode by a wireless communication device that is a constituent terminal of a network in the fourth embodiment. [Figure 34A] 13 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 34B] 34B is a flowchart showing details of the operation execution procedure in step S182 of FIG. 34A. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0063] 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. 1A is a block diagram of a commercial wireless communication device according to the following first and second embodiments, and FIG. 1B is a block diagram of a commercial wireless communication device according to the following third and fourth embodiments. The wireless communication devices correspond to the constituent terminals 51 to 55, 61 to 65 of the network in the simplified configuration diagram of the simplex group wireless communication network shown in FIG. 4 and subsequent figures.

[0064] Regarding the wireless communication device of FIG. 1A (embodiments 1 and 2); The receiving system of this wireless communication device is made up of an antenna 11, two receiving and demodulating units RX1 and RX2, a signal combining unit 12, an amplifier 13, and a speaker (or earphone) . The signal of the radio wave received by the antenna 11 is input to each of the receiving and demodulating sections RX1 and RX2, and the control of these receiving channels is performed by the system control section 10.

[0065] The reception demodulation unit RX1, which is the main reception unit, takes in the reception signal of the set channel, demodulates the reception signal, and outputs it to the signal synthesis unit 12. On the other hand, the receiving and demodulating unit RX2, which is a sub-receiving unit, is controlled to cyclically scan all available channels, and when a group identification signal of the group wireless communication network to which this wireless communication device belongs is detected, it stops channel scanning, opens the squelch in this stopped state, and outputs the demodulated signal to the signal synthesis unit 12.

[0066] The signal synthesis unit 12 synthesizes the demodulated signals output from the receiving and demodulating units RX1 and RX2 and outputs the result to an amplifier 13. The demodulated signal amplified by the amplifier 13 is reproduced as sound by a speaker (or earphone) 14. In addition, the receiving demodulation unit RX1 performs carrier sense for the transmission channel before the modulation transmission unit TX1 performs a transmission operation, and various information is detected from the demodulated signal of the receiving demodulation unit RX2 to control the channel, etc., so the demodulated signals of each receiving demodulation unit RX1, RX2 are also output to the system control unit 10.

[0067] On the other hand, the transmission system of this wireless communication device comprises a microphone 15, an amplifier 16, a modulation transmission section 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 then power-amplified by amplifier 17 and wirelessly transmitted from antenna 18. The control of the transmission channels and the like related to this transmission system is also performed by the system control unit 10.

[0068] The system control unit 10 controls the reception / demodulation units RX1, RX2 and the modulation / transmission unit TX1 by executing a built-in program using 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 13, 16, 17 and the liquid crystal display unit 20, and executes corresponding processes while updating and storing various data using a counter 21 and a memory 22 when controlling in the following first and second embodiments.

[0069] Regarding the wireless communication device of FIG. 1B (embodiments 3 and 4); This wireless communication device differs from the wireless communication device of FIG. 1A only in the following respects, but in relation to this, there are certain differences in the control procedures between the following embodiments 3 and 4 and the embodiments 1 and 2. (1) The reception demodulation unit Rx2, which is a sub-receiving unit, is fixed to the frequency control channel (CH31). (2) The receiver / demodulator RX2 does not handle speech signals, so the signal combiner 12 in FIG. 1A does not exist. (3) Only the demodulated signal received by the receiving and demodulating unit RX1 is reproduced as audio, and the demodulated signal received by the receiving and demodulating unit RX2 is detected and analyzed by the system control unit 10 as a control signal.

[0070] Next, Figure 2 summarizes the frequencies and their channel numbers that specific low-power radio stations can use for simplex wireless communication. A total of 20 channels, channel numbers 20 to 30 in Table 3.3 and channel numbers 41 to 49 in Table 3.5 in the same figure, can be used as communication channels, and channel number 31 in Table 3.3 is specially designated as a frequency control channel (CH31) and can be used to send and receive control signals. In addition, in the wireless communication devices according to the embodiments described below, all channels listed in the table are described as being available for use, but it is not necessary to use all channels, and the settings may be limited to the use of only a few channels.

[0071] FIG. 3 is a diagram showing an example of a communication frame format used in a group wireless communication network in each embodiment described later. 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 self-identification signal (hereinafter referred to as "self-ID") and a transmission / reception channel information signal (hereinafter referred to as "transmission / reception CH"), 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 specification (hereinafter referred to as "CH-CCR"). In addition, in the later-described first and second embodiments, count value information relating to the number of times the 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.

[0072] <<Embodiment 1>> This embodiment relates to the wireless communication device of FIG. 1A and a group wireless communication network system having it as a constituent terminal, and here, as shown in FIG. 4, a simplex group wireless communication network consisting of five terminals 51 to 55 is assumed. In FIG. 4, "TX1-CH21" in each of terminals 51 to 55 indicates a state in which the modulation transmission unit TX1 is set to channel CH21 in FIG. 2, "RX1-CH21" indicates a state in which the reception demodulation unit RX1 is set to the same channel, and "RX2-SCAN" indicates a state in which the reception demodulation unit RX2 is cyclically scanning a total of 20 channels, CH20 to CH30 in Table 3.3 of FIG. 2 and CH41 to CH49 in Table 3.5. Moreover, modules not hatched are active, and modules hatched are inactive. When the modulation transmission unit TX1 is active, the reception demodulation units RX1 and RX2 are inactive.

[0073] The cause of a stray terminal in this network is the following transition of the network state. In FIG. 4, the network channel is CH21, and the reception / demodulation units RX1 (RX1-CH21) of all the terminals 51 to 55 are set to CH21 and are in a reception (standby) mode. Also, the receiving and demodulating units RX2-SCAN of all the terminals 51 to 55 cyclically scan the 20 channels (CH20 to CH30, CH41 to CH49). Specifically, the receiving and demodulating units RX2-SCAN scan one channel for about 100 msec, and the system control unit 10 checks whether the G-ID and CCR are detected from the demodulated signal, and repeats the operation of scanning all of the 20 channels in 2 sec.

[0074] In the state shown in Figure 4, since the network is a simplex system, any terminal can activate the modulation transmission unit TX1-CH21 and enter transmission mode to transmit an audio signal to the reception demodulation unit RX1-CH21 of another terminal. For example, Figure 5 shows the network state in which terminal 51 is transmitting to other terminals 52 to 55, and Figure 6 shows the network state in which terminal 55 is transmitting to other terminals 51 to 54. Even in this state, terminals other than the terminal in the transmission mode receive audio signals by the reception demodulation section RX1-CH21, and the reception demodulation section RX2-SCAN cyclically scans the 20 channels.

[0075] Incidentally, a terminal which wishes to switch to transmission mode and transmit an audio signal must always set its transmission channel to the receiving and demodulating unit RX1 and perform carrier sense (hereinafter referred to as "CS"). Unless it can be confirmed that there is no interference on the channel, it cannot set the modulation and transmitting unit TX1 to that channel and perform a transmission operation [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 non-patent document 1].

[0076] Figure 7 shows a state in which the receiving and demodulating unit RX1 of terminal 53 performs CS on the currently set channel CH21 (which is also the channel currently in use in the network), but interference occurs. Since terminal 53 cannot transmit on CH21, it performs CS on another channel CH28, as shown in Figure 8. The selection of this other channel may be performed by arbitrarily selecting a channel and performing carrier sensing, but it is also possible to adopt a method in which better available channels are prioritized in advance as candidate channels, and then the channels are selected in that order to perform carrier sensing, as proposed in Patent Application No. 2023-074015 by the applicant of the present application described in the [Background Art] section above.

[0077] If there is no interference in the carrier sense of CH28 shown in Figure 8, as shown in Figure 9, terminal 53 activates modulation transmission unit TX1 on CH28 to transmit the GID and CCR, and the other terminals 51, 52, 54, and 55 receive the transmitted radio waves of CH28 during the scanning process of receiving and demodulating unit RX2-SCAN and demodulate the G-ID and CCR. Then, the other terminals 51, 52, 54, and 55 confirm that the G-ID is an identification signal of the group to which they belong, and then, based on the CCR being a channel change request, change the set channel of the receiving / demodulating unit RX1 and the modulating / transmitting unit TX1 from the current CH21 to CH28, which is the receiving channel of the G-ID and CCR, as shown in Figure 10.

[0078] As a result, as shown in Figure 11, the transmission and reception channels of all terminals 51 to 55 are changed to CH28 and the network channel transitions to CH28, and just as in the case of CH12 before interference (Figures 5 and 6), each terminal 51 to 55 can appropriately activate the modulation transmission unit TX1-CH28 and transmit call signals to other terminals.

[0079] By the way, at the stage in Figure 9, i.e., at the stage when terminal 53 transmits the G-ID and CCR to the other terminals 51, 52, 54, 55 on CH28, if any of terminals 51, 52, 54, 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. Specifically, for example, FIG. 12 shows a case where terminal 55 is out of range, etc., and terminals 51, 52, and 54 are able to receive the G-DI and CCR from terminal 53 using the receiving and demodulating unit RX2-SCAN and change their own transmitting and receiving channel to CH28. However, as shown in FIG. 13, only terminal 55 remains on CH21 and is in the state of an outlying terminal. Therefore, even if the terminal 55 returns to the service area or is powered on, it cannot recover communication with the other terminals 51 to 54 and cannot return to the network.

[0080] In this case, the fact that there are no calls from terminal 55 does not mean that terminal 55 has been deviated from the network for terminals 51 to 54. Also, even if terminal 55 continues to have no calls from other terminals 51 to 54 on currently set channel CH21, in a network with few calls, it takes a considerable amount of time for terminal 55 to recognize that it has been deviated from the network.

[0081] 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 communicative state simply by returning to the range or turning the power back on while in range.

[0082] First, the wireless communication device of this embodiment (FIG. 1A) executes the procedure shown in FIG. 14 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 detects whether the modulation transmission unit TX1 of the own terminal has transmitted a G-ID and CCR and whether the reception and demodulation unit RX2-SCAN has received and demodulated the G-ID and CCR from another terminal (S2, S3), and each time this is detected, the operation of incrementing the count value of the counter 21 by +1 is repeated (S4, S5 → S2).

[0083] Therefore, comparing the transitions of the network state (Figures 4 to 11), 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 receiving and demodulating units RX2-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 FIG. 12, when terminal 53 transmits the G-ID and CCR from modulation transmission unit TX1-CH28, terminal 55 is out of range or has its power turned off, so it is unable to receive the G-ID and CCR and therefore the count value of counter 21 is not incremented. In other words, as shown in Figure 13, the set channel CH21 of the transceiver units TX1 and RX1 of the terminal 55 that has become the deviated terminal is different from the set 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.

[0084] 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 14 when a stray terminal occurs, and executes the procedures shown in the flowcharts of Figures 15, 16A and 16B to automatically return the stray terminal, whether it is from this terminal or another party, to the network. First, FIG. 15 shows a signal transmission procedure in the transmission mode. In the receive mode, in order to send a voice message to another terminal on the network, if the PTT button on the operation unit 19 is turned ON and the transmit mode is set, an interrupt is immediately generated (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 procedure related to CS will be omitted), the modulation transmission unit TX1 transmits the G-ID, etc. (including not only the G-ID but also the own ID and the transmit / receive CH), and then the carrier signal is modulated with the input voice signal from the microphone 15 to transmit the voice message (S12, S13).

[0085] In a normal wireless communication device, when the PTT button is turned OFF, a communication end signal is immediately sent and the transmission of the voice message is terminated. However, in the wireless communication device of this embodiment, the communication is not terminated immediately after the PTT button is turned OFF. Instead, the current count value information of the counter 21 is read and transmitted as an additional signal, and then the communication end signal is transmitted and the interrupt process is terminated (S14, S15, S16).

[0086] In the reception mode, if there is no interrupt process due to the transmission mode setting, the procedure in FIG. 16A is executed. First, when the G-ID is demodulated on the receiving and demodulating unit RX1 side, the sender is another terminal that belongs to the group and is set to the same transmitting and receiving channel, and since this is the other terminal with which normal group communication should be performed, the call signal is reproduced and the process returns to the standby state upon detecting the communication end signal (S20~S23→S21).

[0087] On the other hand, if the G-ID is not received and demodulated by receiving and demodulating unit RX1 but is received and demodulated only by receiving and demodulating unit RX2, it is assumed that the source terminal belongs to a group but is in a state where the transmitting and receiving channel is different from that of the own terminal, that is, the own terminal or the source terminal is in a deviation state. In this case, the cyclic scanning operation of receiving and demodulating unit RX2 is stopped at the channel where the G-ID was detected (S21 → S24, S25), and if there is a call signal, it is demodulated and played back (S26, S27), and the count value information added to the end of the call 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 section RX2 that was stopped upon detection of the G-ID (S29).

[0088] 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 transmission / reception 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 is more likely to be the deviating terminal, and the corresponding processing is selected according to the result.

[0089] The specific steps of this comparison and correspondence process (S30) are shown in FIG. 16B. 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 mode is automatically returned to the reception mode and the interrupt processing is exited (S31 → S32 to S36). If N>M: The channels of the modulation transmission unit TX1 and the reception demodulation unit RX1 are changed to the channels related to the channel information updated and 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 (S31 → S37 → S38, S39). For M=N: No action is taken and the channel for the transmitter and receiver is maintained as is (S31→S40).

[0090] The above describes the functions of a simplex group wireless communication network from the viewpoint of a single wireless communication device applied thereto. Next, we will specifically explain how a stray terminal 55 can be returned to the group network from a network state in which the stray terminal 55 has occurred as shown in FIG. 13.

[0091] The simplified configuration diagram of the group network in Figure 17 relates to a case in which any of the terminals 51 to 54 other than the stray terminal 55 (here, terminal 51) goes into transmission mode and makes a call, which serves as the starting event for executing a sequence for returning the stray terminal 55 to the network. First, as shown in the figure, the network channel is CH28, but the transmission and reception channel of the stray terminal 55 is CH21. Here, the terminal 51 executes steps S11 to S16 in FIG. 15, switches to the transmission mode, and transmits the count value information of the counter 21 together with the G-ID and the like and the audio signal from the modulation transmission unit TX1-CH 28. On the other hand, the terminals 52 to 54 execute steps S21 to S23 in FIG. 16A, and in order to receive the G-ID and the like in the reception / demodulation section RX1-CH28, the audio signal is received, demodulated and reproduced in the normal reception mode.

[0092] On the other hand, the deviating terminal 55 executes steps S21, S24 to S30 in FIG. 16A. In other words, the receiving and demodulating unit RX1-CH21 cannot receive radio waves from terminal 51, and naturally does not demodulate the G-ID, etc., but since the receiving and demodulating unit RX2-SCAN receives and demodulates the G-ID on CH28 during the cyclic scanning of channels, it stops the scanning operation and demodulates the call signal, if there is one, and also receives and demodulates the count value information added to the end of the call signal.

[0093] Then, the deviating terminal 55 updates and stores the receiving channel CH28 and count value information (N) in that case in the memory 22, compares the count value information (N) with the count value information (M) of its own counter 21, and executes corresponding processing based on the comparison result. In this case, since the relationship N>M is satisfied at deviation terminal 55, in step S30 in FIG. 16A, the procedure of steps S31→S37 to S39 in FIG. 16B is executed. Therefore, the channel of the transmitting / receiving unit (modulating / transmitting unit TX1 and receiving / demodulating unit RX1) is changed from CH21 to CH28 which has been updated and stored in memory 22, and as a result, terminal 55 can return to the group network from the deviation state. In step 38, the count value information (M) of the counter 21 is rewritten to the count value information (N) of the memory 22, so that the count value information (M) of the counter 21 is also made the same as that of the terminals 51 to .

[0094] The simplified configuration diagram of the group network in FIG. 18 relates to a case where the stray terminal 55 goes into 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 transmission and reception channel of the stray terminal 55 is CH21. In this case, the deviated terminal 55 executes steps S11 to S16 in FIG. 15, switches to the transmission mode, and transmits the count value information of the counter 21 together with the G-ID and the voice signal from the modulation transmission unit TX1-CH21.

[0095] On the other hand, the reception / demodulation units RX1-CH28 of the terminals 51 to 54 cannot receive the radio waves transmitted from the modulation / transmission unit TX1-CH21 of the deviating terminal 55, and therefore executes steps S21→S24 to S30 in FIG. 16A. In other words, in order for the receiving and demodulating unit RX2-SCAN of the terminals 51 to 54 to receive and demodulate the G-ID on CH21 while cyclically scanning the channels, the scanning operation is stopped and then, if there is a call signal, it is demodulated, and further, the count value information added to the end of the call signal is received and demodulated.

[0096] Then, the terminals 51 to 54 update and store the receiving channel information (CH21) and count value information (N) in that case in the memory 22, compare the count value information (N) with the count value information (M) of the counter 21 of the own terminal, and execute corresponding processing based on the comparison result. In this case, since the relationship M>N is satisfied in the terminals 51 to 54, the procedure of steps S31→S32 to S36 in FIG. 16B is executed in step S30 in FIG. 16A. Therefore, the terminals 51 to 54 are automatically set to the transmission mode, and in an interrupted state, the modulation transmission unit TX1-CH28 transmits the G-ID and the count value information of the counter 21 on the currently set channel (CH28), and then returns to the reception mode. However, in reality, there is a competition between the terminals 51 to 54 for transmission on the currently set channel (CH28), so that only one of the terminals with which the CS is established first (hereinafter, referred to as terminal 5X) can transmit.

[0097] On the other hand, in response to the information transmission from the terminal 5X, the deviated terminal 55 executes steps S21→S24 to S30 in FIG. 16A. In this case, in the deviating terminal 55, the radio waves transmitted from terminal 5X on CH28 cannot be received by the receiving and demodulating unit RX1-CH21, and the receiving and demodulating unit RX2-SCAN receives and demodulates the G-ID on CH28 during the cyclic scanning of the channels, so the scanning operation is stopped and the count value information added to the end of the communication signal is received and demodulated, and the receiving channel CH28 and count value information (N) in this case are updated and stored in memory 22.

[0098] Then, the deviating terminal 55 compares the count value information (N) in the memory 22 with the count value information (M) of its own counter 21, and executes corresponding processing based on the comparison result. In this case, since the relationship N>M holds, in step S30 of FIG. 16A, the procedure of steps S31→S37 to S39 of FIG. 16B is executed. Therefore, the channel of the transceiver (modulation transmission unit TX1 and reception demodulation unit RX1) of the stray terminal 55 is changed from CH21 to CH28 which has been updated and stored in the memory 22, and as a result, the terminal 55 can return to the group network from its stray state. In step S39, the count value information (M) of the counter 21 is rewritten with the count value information (N) of the memory 22, and the count value information of the counter 21 is also changed to the same state as that of the terminals 51-54.

[0099] <<Embodiment 2>> As in the first embodiment, this embodiment relates to a group wireless communication network system having the wireless communication device of FIG. 1A and the wireless communication device as its constituent terminals, and assumes a simplex group wireless communication network consisting of five terminals 51 to 55 as shown in FIG. 4. The cause of the occurrence of stray terminals in this network is the same as that explained in the first embodiment with reference to FIGS.

[0100] 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 because a terminal with a later latest transmission / reception time of the G-ID and CCR has remained in the network until recently, and therefore the estimated probability of it being a stray terminal can be considered to be lower.

[0101] Therefore, in the wireless communication device of embodiment 1, Figure 14 shows a procedure for counting the number of times G-ID and CCR are sent and received, while in this embodiment, Figure 19 shows a procedure for updating and storing the detection time information of 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 a G-ID and CCR and whether the reception and demodulation unit RX2-SCAN has received and demodulated the G-ID and CCR from another terminal (S42, S43).Each time such detection is detected, 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).

[0102] According to the method of updating and storing the transmission and reception times of the G-ID and CCR in this embodiment, in 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 in 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 be the latest detection time information.

[0103] 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 19 when a stray terminal occurs, and executes the procedures shown in the flowcharts of Figures 20 and 21 to automatically return the stray terminal, regardless of whether it is from this terminal or another party, to the network.

[0104] First, FIG. 20 shows a signal transmission procedure in the transmission mode. In the receive mode, in order to send a voice message to another terminal on the network, if the PTT button on the operation unit 19 is turned ON and the transmit mode is set, an interrupt is immediately generated (S50, S51), and the receive 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 the carrier signal is modulated with the input voice signal from the microphone 15 to transmit the voice message (S52, S53).

[0105] In a normal wireless communication device, when the PTT button is turned OFF, a communication end signal is immediately sent and the transmission of the voice message is terminated. However, in the wireless communication device of this embodiment, the communication does not immediately end after the PTT button is turned OFF. Instead, the detection time information is read from the [A] area of ​​memory 22 and transmitted as an additional signal, and then the communication end signal is transmitted and the interrupt process is terminated (S54, S55, S56).

[0106] In the reception mode, if there is no interrupt process due to the transmission mode setting, the procedure in FIG. 21A is executed. First, when the G-ID is demodulated on the receiving and demodulating unit RX1 side, the sender is another terminal that belongs to the group and is set to the same transmitting and receiving channel, and since this is the other terminal with which normal group communication should be performed, the call signal is reproduced and the process returns to the standby state upon detecting the communication end signal (S60~S63→S61).

[0107] On the other hand, if the G-ID is not received and demodulated by receiving and demodulating unit RX1 but is received and demodulated only by receiving and demodulating unit RX2, it is assumed that the source terminal belongs to a group but the transmission and reception channel is different from that of the own terminal, that is, the own terminal or the source terminal may be in a deviation state. In this case, the cyclic scanning operation of receiving and demodulating unit RX2 is stopped on the channel where the G-ID was detected (S61 → S64, S65), and if there is a call signal, it is demodulated and played back (S66, S67), and the detection time information added to the end of the call signal is received and demodulated (S68). Also, together with the channel information of the reception demodulation section RX2 that was stopped upon detection of the G-ID, the demodulated detection time information is updated and stored in the [B] area of ​​the memory 22 (S69).

[0108] Then, each time the 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 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 transmission / reception channel from the terminal itself), and by comparing this with the detection time information (T1) updated and stored in the [A] area of ​​memory 22, it is determined which terminal is more likely to be the deviating terminal, and the corresponding processing is selected according to the result.

[0109] The specific steps of this comparison and response process (S70) are shown in FIG. 21B. 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 detection time information (T1) in the [A] area of ​​memory 22 are transmitted. Upon completion of this, the system automatically returns to the reception mode and exits from the interrupt processing (S71 → S72 to S76). If T2 is later than T1: The channels of the modulating transmission unit TX1 and the receiving demodulation unit RX1 are changed to the updated channel stored in the [B] area of ​​the memory 22, and the detection time information (T1) in the [A] area of ​​the memory 22 is rewritten to the detection time information (T2) in the [B] area of ​​the memory 22 (S71 → S77 to S79). If T1=T2: No action is taken and the channel for the transmitter and receiver is maintained as is (S71 -> S80).

[0110] In this embodiment, the return sequence of the stray terminal 55 to the network is similar to the return sequence described in embodiment 1 using Figures 15, 16A, and 16B, except that the "count value information (M) of counter 21" becomes the "detection time information (T1) in the [A] area of ​​memory 22," the "count value information (N) updated and stored in memory 22" becomes the "detection time information (T2) in the [B] area of ​​memory 22," and the "comparison of the magnitude of the count value" becomes the "comparison of the earlier and later detection time information." In this embodiment, the stray terminal 55 can be returned to a state where group communication is possible in a substantially similar procedure.

[0111] Therefore, we will only explain the simple procedure using the steps of Figures 20, 21A, and 21B. As shown in Figure 17 in embodiment 1, if the recovery sequence is due to a transmission event from terminals 51 to 54 (terminal 51 in this case) other than the stray terminal 55, the procedure will be as follows. (1) The terminal 51 executes steps S51 to S56 in Fig. 20. The transmission channel is the currently set channel GH28. (2) When the G-ID is demodulated by the reception demodulation unit RX1-CH28, the terminals 52 to 54 execute steps S61 to S63 in FIG. 21A. (3) When the G-ID is demodulated by the reception demodulation unit RX2-SCAN, the terminal 55 executes steps S64 to S70 in FIG. 21A. (4) In step S70 of FIG. 21A, the terminal 55 executes steps S71→S77 to S79 ​​of FIG. 21B. This enables the stray terminal 55 to change the channel of its transmitting / receiving section from CH21 to CH28, and automatically return to the group wireless communication network.

[0112] On the other hand, as shown in FIG. 18 in the first embodiment, in the case of a recovery sequence due to a transmission event from the stray terminal 55, the procedure is as follows. (1) The terminal 55 executes steps S51 to S56 in Fig. 20. The transmission channel is the currently set channel GH21. (2) When the G-ID is demodulated by the reception demodulation unit RX2-SCAN, the terminals 51 to 54 execute steps S64 to S70 in FIG. 21A. (3) In step S70 of Fig. 21A, the terminals 51 to 54 execute steps S71 → S72 to S76 of Fig. 21B. In this case, the terminals 51 to 54 compete with each other at the CS stage of step S74 of Fig. 21B, and only one of the terminals 5X can transmit. The transmission channel of the terminal 5X is the currently set channel CH28. (4) When the G-ID is demodulated by the reception demodulation unit RX2-SCAN, the terminal 55 executes steps S64 to S70 in FIG. 21A. (5) In step S70 of FIG. 21A, the terminal 55 executes steps S71→S77 to S79 ​​of FIG. 21B. This enables the stray terminal 55 to change the channel of its transmitting / receiving section from CH21 to CH28, and automatically return to the group wireless communication network.

[0113] <<Embodiment 3>> This embodiment relates to the wireless communication device of FIG. 1B and a group wireless communication network system having it as a constituent terminal, and assumes a simplex group wireless communication network consisting of five terminals 61 to 65 as shown in FIG. As described above, the wireless communication device in FIG. 1B has its receiving and demodulating unit RX2 fixed to the frequency control channel CH31, and when changing the network channel as a network constituent terminal 61-65, it transmits the G-ID and CH-CCR using the frequency control channel CH31. Here, unlike the CCR (channel change request signal) used in the first and second embodiments, CH-CCR (channel change request signal with destination channel designation) is used because, while the receiving and demodulating unit RX2 in the first and second embodiments scans all channels used in the network, in this embodiment the channel of the receiving and demodulating unit RX2 is fixed to CH31, and the destination channel cannot be indicated by the transmitting channel and must be indicated as information.

[0114] The transition of the network state when the wireless communication device in this embodiment is used as a network component terminal is shown in FIG. 22 to FIG. However, in each figure, the reception demodulation unit RX2-CH31 indicates that the reception demodulation unit RX2 is set to the frequency control channel CH31. In FIG. 22, the network channel is CH21, but when terminal 63 executes CS in transmission mode on CH21, interference occurs, so the channel is changed to CH28 and CS is executed. Then, if there is no interference in the CS on CH28, as shown in Figure 23, terminal 63 temporarily switches the set channel of modulation transmission unit TX1 to CH31 and transmits the G-ID and CH-CCR, while the other terminals 61, 62, 64, and 65 receive and demodulate these signals in reception and demodulation units RX2-CH31 and each change the channel of their own transmission and reception units (modulation transmission unit TX1 and reception and demodulation unit RX1) to CH28.

[0115] As a result, the network channel is changed from CH21 to CH28, as shown in FIG. However, similar to the causes of stray terminals described in embodiment 1, for example, as shown in Figure 25, terminal 65 that is out of range or has its power turned off during the time period when terminal 63 is transmitting G-ID and CH-CCR cannot change channels. Therefore, as shown in FIG. 26, even though the transmission and reception channel of the other terminals 61 to 64 is CH28, the terminal 65 remains CH21 and becomes a deviated terminal.

[0116] In this embodiment, similarly to the first embodiment, each terminal 61 to 65 uses a counter 21, and each time a G-ID and CH-CCR is transmitted or received, the counter 21 detects the transmission or reception and increments the count value by +1. FIG. 27 shows the procedure, which is the same as the execution procedure in FIG. 14 in the first embodiment, except that in steps S92 and S93, the CH-CCR is detected instead of the CCR.

[0117] 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 27 when a stray terminal occurs, and executes the procedures shown in the flowcharts of Figures 28, 29A and 29B to automatically return the stray terminal, whether it is from this terminal or another party, to the network.

[0118] First, Figure 28 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 own device ID and transmission / reception CH 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 (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 FIG. 15 and steps S54 to S56 of FIG. 20 in embodiments 1 and 2.

[0119] On the other hand, FIG. 29A shows the operation procedure of the wireless communication device of this embodiment, and an interval timer (3 minutes) is always set in the reception mode (S110, S111). If the G-ID is not received and demodulated in either receiving and demodulating unit RX1 or receiving and demodulating unit RX2-CH31 during that 3-minute interval and a timeout occurs (S111, S112 → S115 → S116), there is a possibility that a stray terminal has occurred in the network (particularly since there is a high possibility that the own terminal is the stray terminal), so the transmission mode is automatically set to interrupt, and modulation transmitting unit TX1 is changed from the currently set channel to CH31, after which the G-ID, currently set channel information, and count value information of counter 21 are transmitted on that channel CH31, and after transmitting a communication end signal, modulation transmitting unit TX1 is returned from CH31 to the currently set channel and the interrupt processing is canceled (S116 → S117 to S119).

[0120] Also, although not shown in FIG. 29A, when a timeout occurs, the system control unit 10 may detect this and execute a procedure for displaying on the display unit 20 that the device is in a deviated terminal state and / or a procedure for outputting a special electronic sound from the speaker 14 to notify the user of the terminal.

[0121] If the receiving and demodulating unit RX1 detects the receiving and demodulating of the G-ID before the timeout occurs, the source terminal belongs to the group and the transmitting and receiving channels are the same, so normal group communication will be performed (S111, S112 → S113, S114).

[0122] On the other hand, if the reception and demodulation unit RX2-CH31 detects the reception and demodulation of the G-ID before the timeout, it is assumed that the source terminal has executed steps S117 to S119 when the interval timer times out (S116:Y), and the channel information (currently set channel information of the source) and count value information are received and demodulated following the G-ID (S120), and these are updated and stored in memory 22 (S121).

[0123] Then, every time the channel information and count value information in the memory 22 are updated, the count value information (M times) of the counter 21 is compared with the updated count value information (N times) of the memory 22, and appropriate processing is performed based on the result (S121, S122). This is similar to steps S29 and S30 in FIG. 16A 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 a group but has a different transmission / reception channel from the own terminal), and by comparing this with the count value information (M times) of the own terminal, it is determined which terminal is estimated to have a higher probability of being a deviating terminal, and corresponding processing is performed based on the comparison result.

[0124] The comparison result and corresponding processing procedure in this embodiment are shown in FIG. 29B and are as follows. If M>N: The transmission mode is automatically set, an interrupt is generated, the modulation transmission unit TX1 is changed from the currently set channel to CH31, and the G-ID, currently set channel information, and count value information of the counter 21 (M times) 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 from the interrupt processing (S131 → S132 to S136). If N>M: The channels of the modulation transmission unit TX1 and the reception demodulation unit RX1 are changed to the updated channel 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). For M=N: No action is taken and the channel for the transmitter and receiver is maintained as is (S131→S140).

[0125] The above describes the functions of a simplex group wireless communication network from the viewpoint of a single wireless communication device applied thereto. Next, we will specifically explain how a stray terminal 65 can be returned to the group network from a network state in which the stray terminal 65 has occurred, as shown in FIG. 26.

[0126] The simplified configuration diagram of the group network in Figure 30 relates to a case in which a sequence for returning the stray terminal 65 to the network is executed when any of the terminals 61 to 64 (here, terminal 61) other than the stray terminal 65 goes into transmission mode and transmits the required information on CH31, which serves as the initiating event. The recovery sequence in this case will be explained using the steps in FIGS. 29A and 29B as follows. (1) The terminal 61 executes steps S117 to S119 according to steps S111, S112 → S115 → S116: Y (timeout) in FIG. 29A. (2) Terminal 65 executes steps S115, S120 to S122 in FIG. 29A, and since the condition N>M is satisfied in S122, terminal 65 executes steps S131, S138 and S139 in FIG. 29B. This enables the stray terminal 65 to change the channel of its transmitting / receiving section from CH21 to CH28, and automatically return to the group wireless communication network. (3) The terminals 62 to 64 execute steps S115→S120 to S122 in FIG. 29A, and since the condition M=N is met at S122, the process moves to S131→S140 in FIG. 29B, and no processing is executed.

[0127] On the other hand, the simplified configuration diagram of the group network in Figure 31 relates to a case in which the return sequence of the stray terminal 65 to the network is executed using the start event of the stray terminal 65 going into transmission mode and transmitting the required information on CH31. The recovery sequence in this case will be explained using the steps of FIG. 28 and FIG. 29 as follows. (1) The terminal 65 executes steps S117 to S119 according to steps S111, S112 → S115 → S116: Y (timeout) in FIG. 29A. (2) The terminals 61 to 64 execute steps S115, S120 to S122 in FIG. 29A, and since the condition M>N is satisfied in S122, they execute steps S131, S132 to S136 in FIG. 29B. In this case, terminals 61 to 64 compete with each other at the CS stage for CH31 in step S134 in FIG. 29B, and only one of the terminals is allowed to transmit. (3) The terminal 65 executes step 115→S120 to S122 in FIG. 29A, and since the condition N>M is satisfied in S122, the terminal 65 executes S131→S137 to S139 in FIG. 29B. Therefore, the stray terminal 65 can change the channel of its transmitting and receiving portion from CH21 to CH28, and can automatically return to the group wireless communication network.

[0128] <<Embodiment 4>> As in the third embodiment, this embodiment relates to a group wireless communication network system having the wireless communication device of FIG. 1B as its constituent terminals, and assumes a simplex group wireless communication network consisting of five terminals 61 to 65 as shown in FIG. 22. In this network as well, the causes of the occurrence of stray terminals are the same as those explained in the third embodiment with reference to Figs. 22 to 26.

[0129] The difference between the wireless communication device of this embodiment and that of embodiment 3 is that, as a constituent terminal of a group wireless communication network, while embodiment 3 uses the count value information of the number of transmissions and receptions of G-ID and CH-CCR as a comparison factor for the estimated probability of being a deviating terminal, the earlier or later relationship of the most recent transmission and reception times of G-ID and CH-CCR is used as a comparison factor, which is the same as the difference between the wireless communication device of embodiment 1 and embodiment 2.

[0130] Therefore, in the wireless communication device of embodiment 3, Figure 27 shows a 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 this occurs, while in this embodiment, Figure 32 shows a 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 terminal has transmitted a G-ID and CH-CCR and whether the reception / demodulation unit RX2-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).

[0131] As in the case of embodiment 3, according to the method of updating and storing the transmission and reception times of the G-ID and CH-CCR in this embodiment, in a terminal that is capable of communicating in the group wireless communication network, the latest time information related 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 a stray terminal that is out of range or has its power turned off when the G-ID and CH-CCR are transmitted or received, the record will no longer contain the latest time information.

[0132] The wireless communication device of this embodiment, as a constituent terminal of a simplex wireless communication network, utilizes the difference in time information in area [A] of memory 22 that inevitably occurs in the execution procedure of Figure 32 when a stray terminal occurs, and executes the procedures shown in the flowcharts of Figures 33, 34A and 34B to automatically return the stray terminal, whether it is from this terminal or another party, to the network.

[0133] FIG. 33 shows the procedure for the normal call transmission mode, and although it has the same content as FIG. 28, it 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. (including not only the G-ID but also the terminal's own ID and the transmission / reception CH), and then the carrier signal is modulated with the input voice signal from the microphone 15 to transmit the voice message (S162, S163).When the transmission is completed, 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 a 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 to the end of the call signal as in embodiments 1 and 2.

[0134] On the other hand, FIG. 34A 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 G-ID is not received or demodulated in either receiving / demodulating unit RX1 or receiving / demodulating unit RX2-CH31 during the 3-minute interval and a timeout occurs (S171 → S172 → S175 → S176: Y), there is a possibility that a stray terminal has occurred in the network (especially since there is a high possibility that the own terminal is the stray terminal), so the transmission mode is automatically set, an interrupt is generated, modulation transmitting unit TX1 is changed from the currently set channel to CH31, and 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, modulation transmitting unit TX1 is returned from CH31 to the currently set channel and the interrupt processing is terminated (S177 to S179).

[0135] Also, although not shown in FIG. 34A, when a timeout occurs, the system control unit 10 may detect this and execute a procedure for displaying on the display unit 20 that the device is in a deviated terminal state and / or a procedure for outputting a special electronic sound from the speaker 14 to notify the user of the terminal.

[0136] If the receiving and demodulating unit RX1 detects the receiving and demodulating of the G-ID before the timeout occurs, the source terminal belongs to the group and the transmitting and receiving channels are the same, so normal group communication will be performed (S172 → S173, S174).

[0137] On the other hand, if the reception and demodulation unit RX2-CH31 detects the reception and demodulation of the G-ID before the timeout, it is assumed that the source terminal has executed steps S177 to S179 when the interval timer times out (S176:Y), and the channel information (currently set channel information of the source terminal) and detection time information are received and demodulated following the G-ID (S180), and these are updated and stored in the [B] area of ​​memory 22 (S181).

[0138] Then, each time the channel information and detection time information in the [B] area of ​​the memory 22 are updated and stored, the detection time information (T1) in the [A] area of ​​the memory 22 is compared with the detection time information (T2) in the [B] area, and appropriate processing is performed according to the comparison result (S181, S182). 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 transmission / reception channel from the terminal itself), and by comparing this with the detection time information (T1) of the terminal itself, the order of detection times is found, and it is determined which terminal has a higher estimated probability of being the deviating terminal.

[0139] The comparison result and corresponding processing procedure in this embodiment are shown in FIG. 34B and are as follows. If T1 is later than T2: The transmission mode is automatically set, the modulation transmission unit TX1 is changed from the currently set channel to CH31, and the G-ID, the currently set channel information, and the detection time information (T1) in the [A] area of ​​memory 22 are transmitted, and upon completion of this, the reception mode is automatically returned to (S191 → S193 to S196). If T2 is later than T1: The channels of the modulating transmission unit TX1 and the receiving demodulation unit RX1 are changed to the updated channel stored in the [B] area of ​​the memory 22, and the detection time information (T1) in the [A] area of ​​the memory 22 is rewritten to the detection time information (T2) in the [B] area (S191 → S197, S199). If T1=T2: No action is taken and the channel for the transmitter and receiver is maintained as is (S191 -> S200).

[0140] In this embodiment, the return sequence of the stray terminal 65 to the network is, in relation to the same return sequence described in embodiment 3 using Figures 30 and 31, the "count value information (M) of the counter 21" becomes the "detection time information (T1) in the [A] area of ​​the memory 22," the "count value information (N) updated and stored in the memory 22" becomes the "detection time information (T2) in the [B] area of ​​the memory 22," and the "comparison of the magnitude of the count value" becomes the "comparison of the earlier and later detection time information," but the stray terminal 65 can be returned to a state where group communication is possible in a substantially similar procedure.

[0141] Therefore, we will only explain the simple procedure using the steps of Figures 34A and 34B. As shown in Figure 30 in embodiment 3, if the recovery sequence is due to a transmission event from any terminal other than the stray terminal 65 (here, terminal 61), the procedure will be as follows. (1) The terminal 61 executes steps S177 to S179 according to steps S171, S172 → S175 → S176: Y (timeout) in FIG. 34A. (2) Terminal 65 executes steps S175, S180 to S182 in FIG. 34A, and since the condition "T2 is later than T1" is met in S182, terminal 65 executes steps S191, S197 to S199 in FIG. 34B. This enables the stray terminal 65 to change the channel of its transmitting / receiving section from CH21 to CH28, and automatically return to the group wireless communication network. (3) The terminals 62 to 64 execute step 175→S180 to S182 in FIG. 34A, and since the condition “T1=T2 (simultaneous)” is satisfied in S182, the process proceeds to S191→S200 in FIG. 34B, and no processing is executed.

[0142] On the other hand, as shown in FIG. 31 in the third embodiment, in the case of a recovery sequence due to a transmission event from the stray terminal 65, the procedure is as follows. (1) The terminal 65 executes steps S177 to S179 according to steps S171, S172 → S175 → S176: Y (timeout) in FIG. 34A. (2) The terminals 61 to 64 execute steps S175, S180 to S182 in FIG. 34A, and since the condition "T1 is later than T2" is met in S182, they execute steps S191, S192 to S196 in FIG. 34B. In this case, terminals 61 to 64 compete with each other at the CS stage in step S194 in FIG. 34B, and only one of the terminals is allowed to transmit. (3) Terminal 65 executes steps S175, S180 to S182 in FIG. 34A, and since the condition "T2 is later than T1" is met in S182, terminal 65 executes steps S191, S197 to S199 in FIG. 34B. This enables the stray terminal 65 to change the channel of its transmitting / receiving section from CH21 to CH28, and automatically return to the group wireless communication network. [Industrial Applicability]

[0143] The present invention can be used in a simplex group wireless communication network and the terminals that constitute the network. [Explanation of symbols]

[0144] 10...system control unit, 11...antenna, 12...signal synthesis unit, 13...amplifier, 14...speaker, 15...microphone, 16...amplifier, 17...amplifier, 18...antenna, 19...operation unit, 20...display unit, 21...counter, 22...memory, RX1, RX2...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 using a simplex system, a wireless communication device which is a terminal having a common configuration includes a transmitting / receiving section consisting of a modulation transmitting section and a first receiving / demodulating section, and a second receiving / demodulating section which cyclically scans all channels available in the network in a receiving mode, 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 second receiving / demodulating section, thereby changing the network channel, Each terminal of the network has a function A for counting the number of times the G-ID / CCR is transmitted and received in an incrementing manner and updating and storing the count value information, a function B for, in a transmission mode, adding the count value information of the own terminal to the G-ID and a call signal and transmitting the signal, and a function C for, in a reception mode, detecting and updating the count value information of the transmission source terminal included in the demodulated signal together with reception channel information in the second reception demodulation unit when only the second reception demodulation unit of the first and second reception demodulation units receives and demodulates a signal including the G-ID during a channel scanning process, and a function D for comparing the count value information (M times) of the own device with the count value information (N times) of the source terminal each time the update and storage is performed in the mode, and a function E for automatically setting a transmission mode while keeping the modulation transmission unit at a currently set channel and transmitting the G-ID and the count value information (M times) of the own device when the comparison result is M>N, and for changing the channel of the transmission / reception unit to the updated and stored receiving channel when N>M, and rewriting the count value information (M times) of the own device to the count value information (N times) of the source terminal, and for not executing anything when M=N, A group wireless communication network system characterized in that each terminal in the network is executing function A, and when any one terminal executes function B, the other terminals execute functions C, D, and E, and when M>N occurs during the execution of function D, the other terminal transmits information using function E, and the one terminal executes functions C, D, and E.

2. In a group wireless communication network using a simplex system, a wireless communication device which is a terminal having a common configuration includes a transmitting / receiving section consisting of a modulation transmitting section and a first receiving / demodulating section, and a second receiving / demodulating section which cyclically scans all channels available in the network in a receiving mode, 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 second receiving / demodulating section, 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 / CCR is detected, a function B for adding the detection time information of the own terminal to the G-ID and the call signal in a transmission mode and transmitting the signal, a function C for detecting and updating the detection time information of the source terminal included in the demodulated signal together with the reception channel information in the second reception / demodulation unit when only the second reception / demodulation unit of the first and second reception / demodulation units receives and demodulates a signal including the G-ID during a channel scanning process in a reception mode, and a function C for updating and storing the detection time information of the source terminal included in the demodulated signal when the update / storage is not performed in the reception mode. a function D for comparing the detection time information (T1) of the device with the detection time information (T2) of the source terminal every time the G-ID is detected, and a function E for automatically setting a transmission mode while keeping the modulation transmission unit at the currently set channel and transmitting the G-ID and the detection time information (T1) of the device when the comparison result shows that T1 is later than T2, and for changing the channel of the transmission / reception unit to the updated and stored reception channel when T2 is later than T1, and rewriting the detection time information (T1) of the device to the detection time information (T2) of the source terminal, and for not executing anything when T1 and T2 are simultaneous, A group wireless communication network system characterized in that each terminal in the network is executing function A, and when any one terminal executes function B, the other terminals execute 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.

3. In a group wireless communication network using a simplex system, a wireless communication device which is a terminal having a common configuration includes a transmitting / receiving unit consisting of a modulation transmitting unit and a first receiving / demodulating unit, and a second receiving / demodulating unit set to a frequency control channel, 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") accompanied by a designation of a channel to be changed to on the frequency control channel, while another terminal receives the G-ID and the CH-CCR (both signals are hereinafter collectively referred to as "G-ID-CH-CCR") on the second receiving / demodulating unit, thereby changing the network channel, Each terminal of the network has a function A 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 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 setting an automatic transmission mode in which the transmission modulation unit is temporarily switched from the currently set channel to the frequency control channel and transmitting the G-ID, the currently set channel information and the count value information when a reception demodulation signal including the G-ID is not detected for a predetermined time from either the first or second reception demodulation unit in the reception mode, and a function D for transmitting the G-ID, the currently set channel information and the count value information when only the second reception demodulation unit of the first and second reception demodulation units receives and demodulates a signal including the G-ID in the reception mode. Further, the device has a function D for detecting the currently set channel information and count value information of the transmission source terminal included in the demodulated signal, and updating and storing the same; a function E for comparing the count value information (M times) of the device itself with the count value information (N times) of the transmission source terminal each time the updating and storing is performed in the reception mode; and a function F for, when the result of the comparison is M>N, setting a transmission mode in which the modulation transmission unit is temporarily changed from the currently set channel to a frequency control channel, transmitting the G-ID, the currently set channel information of the device itself, and the count value information (M times), and, when N>M, changing the channel of the transmission / reception unit to the currently set channel of the transmission source terminal, and rewriting the count value information (M times) of the device itself to the count value information (N times) of the transmission source terminal, and, when M=N, not executing anything. A group wireless communication network system characterized in that each terminal in the network is executing function A and also executing function B as appropriate, and in response to execution of function C by any one terminal, the other terminals execute functions D, E, and F, and in that case, when M>N occurs during the execution of function E, the other terminal transmits information using function F, and the one terminal executes functions D, E, and F.

4. In a group wireless communication network using a simplex system, a wireless communication device which is a terminal having a common configuration includes a transmitting / receiving unit consisting of a modulation transmitting unit and a first receiving / demodulating unit, and a second receiving / demodulating unit set to a frequency control channel, 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") accompanied by a designation of a channel to be changed to on the frequency control channel, while another terminal receives the G-ID and the CH-CCR (both signals are hereinafter collectively referred to as "G-ID-CH-CCR") on the second receiving / demodulating 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 call signal, a function C for setting an automatic transmission mode in which the transmission modulation unit is temporarily switched from the currently set channel to the frequency control channel when a reception demodulation signal including the G-ID is not detected for a predetermined time from either the first or second reception demodulation unit in the reception mode, and transmitting the G-ID, the currently set channel information, and the detection time information, and a function D for transmitting the G-ID, the currently set channel information, and the detection time information when only the second reception demodulation unit of the first and second reception demodulation units receives and demodulates a signal including the G-ID in the reception mode. a function D for detecting currently set channel information and detection time information of the source terminal and updating and storing the information; a function E for comparing the detection time information (T1) of the device itself with the detection time information (T2) of the source terminal each time the updating and storing is performed in a receiving mode; and a function F for, when T1 is later than T2 as a result of the comparison, setting a transmission mode in which the modulation transmission unit is temporarily changed from the currently set channel to a frequency control channel, transmitting the G-ID, the currently set channel information of the device itself, and the detection time information (T1), and when T2 is later than T1, changing the currently set channel of the transmission / reception unit to the currently set channel of the source terminal, and rewriting the detection time information (T1) of the device itself to the detection time information (T2) of the source terminal, and not executing anything when T1 and T2 are simultaneous. A group wireless communication network system characterized in that each terminal in the network is executing function A and also executing function B as appropriate, and when any 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.

5. A wireless communication device as a common terminal in a simplex group wireless communication network, comprising a transceiver unit consisting of a modulation transmission unit and a first reception demodulation unit, and a second reception demodulation unit for cyclically scanning all channels available in the network in a reception mode, said modulation transmission unit transmitting 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 receiving said G-ID and said CCR (both signals hereinafter collectively referred to as "G-ID-CCR") transmitted on a designated change destination channel from another terminal during the channel cyclic scanning process of said second reception demodulation unit, thereby enabling a change of network channel, a count storage means for counting the number of times the G-ID and CCR are transmitted and received in an incrementing manner and updating and storing the count value information; an information transmitting means for transmitting the G-ID and the call signal together with the count value information of the count storage means in a transmission mode; an information detection means for detecting, in a reception mode, when only the second reception / demodulation unit of the first and second reception / demodulation units receives and demodulates a signal including the G-ID during a channel scanning process, count value information of a source terminal included in the demodulated signal together with reception channel information in the second reception / demodulation unit; an information storage means for updating and storing the reception channel information and the count value information of the transmission source terminal detected by the information detection means; a comparison means for comparing the count value information (M times) of the count storage means with the count value information (N times) of the information storage means each time the information storage means updates and stores the information; a processing means for automatically setting a transmission mode while keeping the modulation transmission unit at a currently set channel when M>N is found as a result of the comparison, and transmitting the G-ID and the count value information (M times) of the own device, and for changing the channel of the transmission / reception unit to a receiving channel of the information storage means when N>M is found, 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; A wireless communication device comprising:

6. 6. The wireless communication device according to claim 5, wherein said information transmitting means transmits the count value information of said count storing means by adding it to the end of a speech signal frame.

7. A wireless communication device as a common terminal in a simplex group wireless communication network, comprising a transceiver unit consisting of a modulation transmission unit and a first reception demodulation unit, and a second reception demodulation unit for cyclically scanning all channels available in the network in a reception mode, said wireless communication device enabling a change of said network channel by transmitting a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CCR") from said modulation transmission unit on a designated change destination channel, and receiving said G-ID and said CCR (both signals hereinafter collectively referred to as "G-ID-CCR") transmitted on a designated change destination channel from another terminal during the channel cyclic scanning process of said second reception demodulation unit, a time storage means for updating and storing detection time information when the transmission / reception of the G-ID / CCR is detected; an information transmitting means for transmitting the G-ID and the call signal together with the detected time information of the time storage means in a transmission mode; an information detection means for detecting, in a reception mode, when only the second reception / demodulation unit of the first and second reception / demodulation units receives and demodulates a signal including the G-ID during a channel scanning process, detection time information of a source terminal included in the demodulated signal together with reception channel information in the second reception / demodulation unit; an information storage means for updating and storing the reception channel information detected by the information detection means and the detection time information of the transmission source terminal; a comparison means for comparing the detected time information (T1) of the time storage means with the detected time information (T2) of the information storage means each time the information storage means updates and stores the information; a response processing means for automatically setting a transmission mode while keeping the modulation transmission unit in a currently set channel when T1 is later than T2, and transmitting the G-ID and the detected time information (T1) of the time storage means when T2 is later than T1, and changing the channel of the transmission / reception unit to a receiving channel of 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; A wireless communication device comprising:

8. 8. The wireless communication device according to claim 7, wherein said information transmitting means transmits the detected time information of said time storage means by adding the detected time information to the end of a speech signal frame.

9. A wireless communication device as a common terminal in a simplex group wireless communication network, comprising a transceiver unit consisting of a modulation transmission unit and a first reception demodulation unit, and a second reception demodulation unit set to a frequency control channel, said modulation transmission unit transmitting a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CH-CCR") accompanied by a designation of a change destination channel on said frequency control channel, and said second reception demodulation unit receiving said G-ID and said CH-CCR (both signals collectively referred to as "G-ID-CH-CCR" hereinafter) transmitted on said frequency control channel from another terminal, thereby enabling said network channel to be changed, a count storage means for counting the number of times the G-ID·CH-CCR is transmitted and received in an incrementing 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, in a reception mode, when a reception demodulation signal including the G-ID is not detected for a predetermined time from either the first or second reception demodulation means, setting an automatic transmission mode in which the transmission modulation means is temporarily switched from the currently set channel to the frequency control channel, and transmitting the G-ID, currently set channel information, and count value information of the count storage means; an information detection means for detecting, in a reception mode, when only the second reception / demodulation unit of the first and second reception / demodulation units receives and demodulates a signal including the G-ID, currently set channel information and count value information of the transmission source terminal included in the demodulated signal; an information storage means for updating and storing currently set channel information and count value information of the source terminal detected by the information detection means; a comparison means for comparing the count value information (M times) of the count storage means with the count value information (N times) of the information storage means each time the information storage means updates and stores the information; a processing means for setting a transmission mode in which the modulation transmission unit is temporarily changed from a currently set channel to a frequency control channel when the result of the comparison is M>N, and transmitting the G-ID, the currently set channel information of the transmission / reception unit, and the count value information (M times) of the count storage means when N>M, changing the channel of the transmission / reception unit to the currently set channel 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; A wireless communication device comprising:

10. A wireless communication device as a common terminal in a simplex group wireless communication network, comprising a transceiver unit consisting of a modulation transmission unit and a first reception demodulation unit, and a second reception demodulation unit set to a frequency control channel, said modulation transmission unit transmitting a group identification signal (hereinafter referred to as "G-ID") and a channel change request signal (hereinafter referred to as "CH-CCR") accompanied by a designation of a change destination channel on said frequency control channel, and said second reception demodulation unit receiving said G-ID and said CH-CCR (both signals collectively referred to as "G-ID-CH-CCR" hereinafter) transmitted on said frequency control channel from another terminal, thereby enabling said network channel to be changed, a time storage means for updating and storing detection time information when transmission / reception of the G-ID·CH-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, when a reception demodulation signal including the G-ID is not detected for a predetermined time from either the first or second reception demodulation means in a reception mode, setting an automatic transmission mode in which the transmission modulation means is temporarily switched from the currently set channel to the frequency control channel, and transmitting the G-ID, currently set channel information, and detection time information of the time storage means; an information detection means for detecting and updating currently set channel information and detection time information of the source terminal included in the demodulated signal when only the second demodulation unit of the first and second demodulation units receives and demodulates the signal including the G-ID in a reception mode; 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 detected time information (T1) of the time storage means with the detected time information (T2) of the information storage means each time the information storage means updates and stores the information; a response processing means for setting a transmission mode in which the modulation transmission unit is temporarily changed from a currently set channel to a frequency control channel when the result of the comparison shows that T1 is later than T2, and for transmitting the G-ID, currently set channel information of the transmission / reception unit, and detected time information (T1) of the time storage means, and for changing the currently set channel of the transmission / reception unit to the currently set channel of the transmission source terminal stored in the information storage means when T2 is later than T1, and rewriting the detected time information (T1) of the own device to the detected time information (T2) of the transmission source terminal; A wireless communication device comprising:

11. The wireless communication device according to claim 9 or 10, further comprising a display control means for causing a display means to display that the device is likely to be in a deviated terminal state when, in a reception mode, a reception demodulation signal including the G-ID is not detected from either the first or second reception demodulation unit for a predetermined period of time, and / or an audio output control means for outputting a predetermined sound from an audio output means to notify that the device is in the deviated terminal state.

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