CN110677534A - Simplex talkback mobile terminal and method for preventing missed call answering of incoming call - Google Patents
Simplex talkback mobile terminal and method for preventing missed call answering of incoming call Download PDFInfo
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- CN110677534A CN110677534A CN201910825895.5A CN201910825895A CN110677534A CN 110677534 A CN110677534 A CN 110677534A CN 201910825895 A CN201910825895 A CN 201910825895A CN 110677534 A CN110677534 A CN 110677534A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/724—User interfaces specially adapted for cordless or mobile telephones
- H04M1/72403—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
- H04W4/10—Push-to-Talk [PTT] or Push-On-Call services
Abstract
The invention relates to a simplex talkback mobile terminal and a method for preventing missed call answering of an incoming call, which solve the technical problems of missed call answering and weak confidentiality of other frequency terminals, and adopts an amplification second receiving unit, a frequency scanning preset unit and a number storage unit; the control unit is bidirectionally connected with the frequency scanning preset unit, the output of the frequency scanning preset unit is connected with the second receiving unit to finish data transmission, the output of the second receiving unit is connected with the number storage unit, and the number storage unit is bidirectionally connected with the control unit; the control unit is also connected with the transmitting unit in a bidirectional way, and is connected with the first receiving unit in a bidirectional way, so that the problem is better solved, and the control unit can be used in simplex talkback mobile communication.
Description
Technical Field
The invention relates to the field of mobile communication terminals, in particular to a simplex talkback mobile terminal and a method for preventing missed call answering of an incoming call.
Background
The talkback mobile terminal belongs to a special mobile communication terminal, and is widely applied to various industries such as public transport, railway, police, army and the like due to the factors of low equipment price, no need of extra communication cost, simple and convenient operation and the like. The greatest difference with the known terminals of the public cellular mobile communication system is that communication between subscribers over a longer distance is possible without network infrastructure. In order to solve the contradiction between power consumption and communication distance requirements and working time, reduce the waste of frequency resources and avoid the requirement of a duplexer, a talkback mobile terminal usually adopts a simplex communication working method to realize bidirectional communication, namely the device does not receive signals when transmitting signals and does not transmit signals when receiving signals, and the device needs to switch transmitting/receiving states by pressing/loosening a special device, which is generally called as a PTT key, and the devices are generally called simplex talkback mobile terminals.
The simplex talkback mobile terminal communication mainly has the following problems:
(1) each terminal can only work on a certain preset channel frequency fixedly, and the terminal to communicate with the terminal must adjust the working frequency to be consistent with the working frequency, so that the terminal can miss calls of terminals working on other frequencies.
(2) In order to facilitate communication among users or be limited by working frequency, the simplex talkback mobile terminal usually adopts point-to-multipoint, and at the moment, a terminal sends a message and other terminals receive the message, so that the information has no privacy; therefore, in order to enable a user to communicate with other multiple users (networks) individually, the user often needs to carry multiple simplex talkback mobile terminals.
The invention aims to provide a simplex talkback mobile terminal and a method for preventing missed incoming call answering, and solves the technical problems.
Disclosure of Invention
The invention aims to solve the technical problems of call missing and poor confidentiality of other frequency terminals in the prior art. The novel simplex talkback mobile terminal has the advantages of no leakage of calls of other frequency terminals, high applicability and high confidentiality.
In order to solve the technical problems, the technical scheme is as follows:
a simplex talkback mobile terminal comprises a power supply unit, a PTT key, a control unit, a receiving unit, a transmitting unit and a transmitting unit, wherein the simplex talkback mobile terminal comprises a second receiving unit, a frequency scanning preset unit and a number storage unit;
the control unit is bidirectionally connected with the frequency scanning preset unit, the output of the frequency scanning preset unit is connected with the second receiving unit to finish data transmission, the output of the second receiving unit is connected with the number storage unit, and the number storage unit is bidirectionally connected with the control unit; the control unit is also bidirectionally connected with the transmitting unit and the first receiving unit.
The working principle of the invention is as follows: because the receiving unit is added to the simplex talkback mobile terminal for effective call scanning, the call of other simplex talkback mobile terminals can not be missed in the communication process, and the simplex talkback mobile terminal can be communicated with the users (networks) with different preset working frequencies, so that the users can get rid of the trouble that the users need to carry a plurality of simplex talkback mobile terminals in daily work. The invention has the following advantages: the simplex talkback mobile terminal can realize private communication between users and prevent call missing in the communication process.
In the above scheme, for optimization, further, the second receiving unit is controlled by the frequency scanning presetting unit to perform working frequency receiving scanning, identify a called object after scanning an effective calling signal, and change the working frequencies of the first receiving unit and the transmitting unit through the control unit; the second receiving unit is used for scanning the call frequency points determined by the frequency scanning preset unit and sending the scanned calls to the number storage unit for analysis and query; the number storage unit is controlled by the control unit and used for judging and selecting effective calls according to the received call information and transmitting the effective calls to the control unit.
The invention also provides a method for preventing the incoming call from being missed, which is based on the simplex talkback mobile terminal and comprises the following steps:
step 3, judging whether the calling terminal and the called terminal both use the same transceiving frequency, if so, the calling terminal presses a PPT key to execute step 8, otherwise, the step 4 is executed;
step 4, the second receiving unit of any terminal j in the rest N-1 simplex talkback mobile terminals carries out signal capture according to the frequency scanning range set by the frequency scanning presetting unit of any terminal j, and the captured calling terminal i passes through the corresponding working frequency fiThe sent call information is transmitted to a number storage unit of any terminal j;
step 5, the number storage unit of any terminal j analyzes and compares the call information received from the second receiving unit, and the called number Numb in the call informationjIs the same as any terminal j number or called number Numb _ g in calling informationxIf the group calling number is the same as the group calling number of the group where any terminal j is located, judging the group calling number to be an effective calling and executing the step 6, otherwise, judging the group calling number to be an ineffective calling and discarding the calling information;
step 6, the number storage unit of any terminal j analyzes the working frequency of the effective call information corresponding to the calling terminal i, the effective call information is stored and forwarded to the control unit, the call prompt is displayed, if any terminal j confirms that the call is connected, the step 7 is executed, otherwise, the effective call is ignored;
step 7, the control unit of any terminal j sends the frequency information f of the calling terminal i according to the number storage unitiOperating frequency f of the transmitting unittAnd the operating frequency f of the receiving unitrIs set to fi；
Step 8, any terminal j presses down a PTT key to carry out call answering;
9, after the communication is finished, all the terminals reply the original working frequency to enter a standby state;
wherein N, M is a positive integer greater than 1, i and j are positive integers not greater than N and i ≠ j, and x is a positive integer not greater than M.
Further, any terminal j confirms that the call completion is completed by the PTT key.
As shown in fig. 1, a conventional simplex talkback mobile terminal structure generally includes a control unit, an audio unit, a transmitting unit, a receiving unit, a power supply unit, and other modules, as well as a PTT button. The control unit completes control conversion, parameter setting and the like of the working state of the equipment; the audio unit completes the processing of filtering, compression, amplification, encryption, pre-emphasis and the like of the voice signal; the transmitting unit, the receiving unit and the band-pass filter complete the functions of modulating, transmitting, receiving and demodulating voice and signaling signals and the like; the power supply unit supplies power for the whole mobile terminal, and is controlled by the PTT key to supply power to any one unit of the transmitting unit and the receiving unit, namely, the receiving unit is not supplied with power when the transmitting unit is supplied with power, and the transmitting unit is not supplied with power when the receiving unit is supplied with power.
The simplex intercom mobile terminal can conveniently realize point-to-point and point-to-multipoint communication, and the communication processes are respectively shown in fig. 2 and fig. 3.
As can be seen from fig. 2, the protocol for the point-to-point communication of the simplex talkback mobile terminal is as follows:
(1) first of all, the two terminals (terminal 1 and terminal 2) that need to communicate must operate on the same transceiving frequency.
(2) The terminal (terminal 1) which needs to initiate the call presses the PTT key to send a signal, and after the information is sent, the PTT key is released to wait for the reply of the other party.
(3) After receiving the information of the calling terminal (terminal 1), the called terminal (terminal 2) presses the PTT key to send a signal if the information needs to be replied, and releases the PTT key to wait for the reply of the opposite side after the information is replied; if the reply information is not needed, no operation is needed.
(4) Thereafter, the terminal 1 and the terminal 2 transmit and receive the signal by alternately pressing the PTT key and releasing the PTT key.
(5) After the communication is completed, both the terminals (terminal 1 and terminal 2) do not perform any operation, that is, wait for the set frequency to enter the standby state.
As can be seen from fig. 3, the protocol for point-to-multipoint communication of the simplex talkback mobile terminal is as follows:
(1) first all the terminals (terminal 1, terminal 2, …, terminal N-1, terminal N) that need to communicate must operate on the same transceiving frequency.
(2) A terminal (terminal i) needing to initiate a call presses a PTT key to send a signal, and after the information is sent, the PTT key is released to wait for the return of other terminals; at this time, other N-1 terminals (terminal 1, terminal 2, …, terminal i-1, terminal i +1, …, terminal N-1, terminal N) all receive the information from terminal i.
(3) After the called terminals (terminal 1, terminal 2, …, terminal i-1, terminal i +1, …, terminal N-1, terminal N) receive the information of the calling terminal (terminal i), if a certain called terminal needs to send information, the PTT key is pressed to send the information, and after the information is sent, the PTT key is released to wait for receiving the information of other terminals; if a certain terminal j does not need to transmit information, no operation is required.
(4) After the communication is finished, all the terminals (terminal 1, terminal 2, …, terminal N-1, terminal N) do not perform any operation, i.e. wait for entering the standby state at the set frequency.
As can be seen from the above two communication protocols, the simplex talkback mobile terminal communication mainly has the following problems:
(1) each terminal can only work on a certain preset channel frequency fixedly, and the terminal to communicate with the terminal must adjust the working frequency to be consistent with the working frequency, so that the terminal can miss calls of terminals working on other frequencies.
(2) In order to facilitate communication among users or be limited by working frequency, the simplex talkback mobile terminal usually adopts point-to-multipoint, and at the moment, a terminal sends a message and other terminals receive the message, so that the information has no privacy; therefore, in order to enable a user to communicate with other multiple users (networks) individually, the user often needs to carry multiple simplex talkback mobile terminals.
The invention has the beneficial effects that: the invention adds a receiving unit for effective calling scanning in the simplex talkback mobile terminal, thereby avoiding missing the calling of other simplex talkback mobile terminals in the communication process, and simultaneously, users (networks) with different preset working frequencies can communicate with each other, thereby the users can get rid of the trouble that a plurality of simplex talkback mobile terminals need to be carried in daily work. The invention has the following advantages: the simplex talkback mobile terminal can realize private communication between users and prevent call missing in the communication process.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a block diagram of a typical conventional simplex intercom mobile terminal.
Fig. 2, a point-to-point communication protocol for a simplex intercom mobile terminal.
Fig. 3, a point-to-multipoint communication protocol for a simplex talkback mobile terminal.
Fig. 4 is a block diagram of the simplex talkback mobile terminal according to the embodiment.
Fig. 5 shows a point-to-point communication method of the simplex talkback mobile terminal according to the embodiment.
Fig. 6 shows a point-to-multipoint communication method for a simplex talkback mobile terminal according to this embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
In this embodiment, as shown in fig. 4, a part of circuit units is added to a typical composition structure of a simplex intercom mobile terminal, so that private communication between users (networks) is supported, and meanwhile, a call missed to another simplex intercom mobile terminal can be prevented, and a user can communicate with a plurality of simplex intercom mobile terminals working at other frequencies by only carrying one simplex intercom mobile terminal.
As shown in fig. 4, the hardware structure of a typical simplex talkback mobile terminal is improved, and a frequency scanning preset unit is added, where the frequency scanning preset unit can be added as an independent hardware module or an added function item of an original control unit, and is used to set a frequency for scanning by a receiving unit, and the scanning frequency may be the whole operating frequency band of the simplex talkback mobile terminal or may be a plurality of continuous frequency points or a plurality of discrete frequency points.
The receiving unit 2 in fig. 4 is configured to scan the call frequency points determined by the frequency scanning preset unit, and send the scanned calls to the number storage unit for analysis.
The number storage unit in fig. 4 is controlled and managed by the control unit, and is used for storing the number information of the present simplex talkback mobile terminal and the number information of other simplex talkback mobile terminals or other simplex communication network numbers (group numbers); analyzing and comparing the received call information sent by the receiving unit 2, if the call information is the number of the simplex talkback mobile terminal, the call information is an effective call, and storing and transmitting the frequency information of the effective call to the control unit; otherwise, it is invalid call and discards the call information.
The invention also provides a method for preventing the incoming call from being missed by the simplex talkback mobile terminal, which is exemplified by point-to-point and multipoint-to-multipoint.
When the working simplex talkback mobile terminals comprise a terminal 1, a terminal 2, …, a terminal N-1 and a terminal N, each terminal stores the own number and the numbers of other terminals (N-1), and the working frequency of the other terminals (N-1) is preset as the scanning frequency of the second receiving unit of the terminal by each terminal. The point-to-point communication method of any two simplex talkback mobile terminals at this time is shown in fig. 5.
(1) Two terminals needing communication are a terminal 1 and a terminal 2, wherein the terminal 1 is a calling party and the working frequency f of the terminal is1And stores the local number Numb1And called terminal 2 number Numb2(ii) a The terminal 2 is called and its working frequency f2The local number Numb is stored2And the frequency scanning presetting unit sets the frequency range scanned by the second receiving unit to include the working frequency f of the terminal 11。
(2) If two terminals (terminal 1 and terminal 2) needing communication operate at the same transceiving frequency, i.e. f1＝f2Then, communication is carried out according to an origin-to-point communication protocol; otherwise f1≠f2Point-to-point communication is performed according to the following communication protocol.
(3) The calling terminal 1 selects the number Numb of the called terminal 22After at its operating frequency f1Pressing PPT key to initiate call.
(4) The second receiving unit of the terminal 2 performs signal capturing work according to the frequency scanning range set by the frequency scanning preset unit, and transmits the captured calling information sent by other terminals through the corresponding working frequencies to the number storage unit in the terminal.
(5) Number storage unit of terminal 2 for call from second receiving unitAnd (5) analyzing and comparing the information. The number storage unit analyzes the called number Numb obtained from the call information at this time, and then compares whether the called number Numb is the local number of the terminal 2, if Numb is equal to Numb2If yes, the call is valid; otherwise Numb ≠ Numb2The call information is discarded without further processing.
(6) Through the above process, when the terminal 2 scans the call information of the terminal 1, Numb ═ Numb2And the call is an effective call, and at the moment, the number storage unit analyzes the working frequency of the terminal corresponding to the call information, stores the working frequency and forwards the working frequency to the control unit. For a call from terminal 1, it is known that f ═ f1。
(7) After receiving the effective call, the terminal 2 will display a call prompt, if confirming that the communication with the calling terminal is needed, pressing a confirmation key (which can be a PTT key or other keys, and is determined according to specific design); otherwise, pressing the ignore key to ignore the call.
(8) After the terminal 2 presses the confirmation key, the control unit sets the working frequency f of the transmitting unit according to the calling terminal frequency information f sent by the number storage unittAnd the operating frequency f of the first receiving unitr. As can be seen from the above procedure, for a call f ═ f from the terminal 11I.e. setting ft＝fr＝f1。
(9) Then, the terminal 2 presses the PTT key to make a call response.
(10) Thereafter, the terminal 1 and the terminal 2 transmit and receive the signal by alternately pressing the PTT key.
(11) After the communication is finished, the two parties (the terminal 1 and the terminal 2) do not need to carry out any operation, and the terminal 2 transmits the working frequency f of the transmitting unittAnd the operating frequency f of the first receiving unitrRestoring the original operating frequency, i.e. ft＝fr＝f2The terminal 1 and the terminal 2 finally wait at the set frequency f1And f2And entering a standby state.
The point-to-multipoint communication protocol of the simplex talkback mobile terminal of the embodiment is shown in fig. 6.
When the working simplex talkback mobile terminal comprises a terminal 1, a terminal 2, …, a terminal N-1 and a terminal N, each terminal stores a local number and (N-1) numbers of other terminals, and the working frequency of the (N-1) other terminals is preset as the scanning frequency of the second receiving unit of the terminal by each terminal. The communication procedure of any two terminals at this time is as follows.
(1) The simplex talkback mobile terminal 1 needs to communicate with a plurality of simplex talkback mobile terminals/a simplex talkback mobile terminal network (e.g. consisting of terminal 2, …, terminal N-1, terminal N), wherein terminal 1 is the calling party and its operating frequency f1And stores the local number Numb1Group number Numb _ g corresponding to a plurality of simplex talkback mobile terminals/simplex talkback mobile terminal network of called partyx(ii) a Terminal 2, …, terminal N-1, terminal N being the called terminal, their operating frequencies being f2，…，fN-1，fN(these working frequencies can be the same), and there is the same set number Numb _ g, which sets the frequency range scanned by the second receiving unit at their frequency scanning preset unit to include the working frequency f of the terminal 11。
(2) If terminal 1, terminal 2, …, terminal N-1, terminal N all operate at the same transceiving frequency, i.e. f1＝f2＝…＝fN-1＝fNThen, communication is carried out according to the original point-to-multipoint communication protocol; otherwise, point-to-multipoint communication is performed according to the following communication protocol.
(3) After the calling terminal 1 selects the called group number Numb _ g, it will set the working frequency f1Pressing PPT key to initiate call.
(4) The second receiving unit of any terminal j (j belongs to 2, 3, …, N-1, N) in the terminals 2, …, N-1 and N carries out signal capture work according to the frequency scanning range set by the frequency scanning preset unit, and transmits the captured calling information sent by other terminals through the corresponding working frequencies to the number storage unit in the terminal.
(5) The number storage unit of the arbitrary terminal j analyzes and compares the call information from the second receiving unit. After analyzing the called number Numb in the call information obtained at this time, the number storage unit compares whether the called number Numb is a group number of the terminal j, and if the Numb is equal to Numb _ g, the call is an effective call; otherwise, Numb ≠ Numb _ g, discarding the call information without further processing.
(6) Through the above process, when the terminal j scans the call information of the terminal 1, Numb _ g is an effective call, and at this time, the number storage unit analyzes the operating frequency of the terminal corresponding to the call information, stores the operating frequency and forwards the operating frequency to the control unit. For a call from terminal 1, it is known that f ═ f1。
(7) After receiving the effective call, the terminal j displays a call prompt, and if the communication with the calling terminal is confirmed to be needed, a confirmation key (a PTT key or other keys can be used, and the confirmation is determined according to specific design) is pressed; otherwise, pressing the ignore key to ignore the call.
(8) After the terminal j presses the confirmation key, the control unit sets the working frequency f of the transmitting unit according to the calling terminal frequency information f sent by the number storage unittAnd the operating frequency f of the first receiving unitr. As can be seen from the above procedure, for a call f ═ f from the terminal 11I.e. setting ft＝fr＝f1。
(9) Then, terminal j presses the PTT key to answer the call.
(10) The other terminals of the terminal 2, …, the terminal N-1 and the terminal N are also processed according to the procedures (4) to (10); thereafter, terminal 1, terminal 2, …, terminal N-1, terminal N receives a signal by alternately pressing the PTT key to send a signal and sending the PTT key to send it.
(11) After the communication is finished, all terminals do not need to carry out any operation, namely the terminal 2, … and the terminal N-1, wherein the terminal N transmits the working frequency f of the transmitting unittAnd the operating frequency f of the first receiving unitrRestore to their original operating frequencies, i.e. terminal 1, terminal 2, …, terminal N-1 and terminal N finally wait at the set frequency f1，f2，…，fN-1，fNAnd entering a standby state.
Although the illustrative embodiments of the present invention have been described above to enable those skilled in the art to understand the present invention, the present invention is not limited to the scope of the embodiments, and it is to be understood that all the inventions utilizing the inventive concept can be protected by those skilled in the art as long as various changes are within the spirit and scope of the present invention as defined and defined in the appended claims.
Claims (4)
1. A simplex talkback mobile terminal comprises a power supply unit, a PTT key, a control unit, a first receiving unit, a transmitting unit and a transmitting unit, and is characterized in that: the simplex intercom mobile terminal also comprises a second receiving unit, a frequency scanning presetting unit and a number storage unit;
the control unit is bidirectionally connected with the frequency scanning preset unit, the output of the frequency scanning preset unit is connected with the second receiving unit, the output of the second receiving unit is connected with the number storage unit, and the number storage unit is bidirectionally connected with the control unit;
the control unit is also bidirectionally connected with the transmitting unit and the first receiving unit.
2. The simplex intercom mobile terminal of claim 1, wherein:
the second receiving unit is controlled by the frequency scanning preset unit to perform working frequency receiving scanning, and performs called object identification after scanning an effective calling signal, and then changes the working frequencies of the first receiving unit and the transmitting unit through the control unit; the second receiving unit is used for scanning the call frequency points determined by the frequency scanning preset unit and sending the scanned call information to the number storage unit for analysis and query; the number storage unit is controlled by the control unit and used for judging and selecting effective calls according to the received call information and transmitting the effective calls to the control unit.
3. A method for preventing missed call answering of incoming call of a simplex talkback mobile terminal is characterized by comprising the following steps: the method for preventing the missed call of the incoming call of the simplex talkback mobile terminal is based on the simplex talkback mobile terminal of any one of claims 1 to 2, and comprises the following steps:
step 1, selecting N simplex talkback mobile terminals for networking, defining the ith simplex talkback mobile terminal as a calling terminal, and working frequency fiEach simplex talkback mobile terminal stores a local number NumbiAnd the numbers (Numb) of the rest N-1 simplex talkback mobile terminals1，Numb2，…，Numbi-1，Numbi+1，…，NumbN-1,NumbN) And M group calling numbers (Numb _ g) corresponding to the local number and the user1，Numb_g2，…，Numb_gM-1,Numb_gM) (ii) a Defining one simplex talkback mobile terminal as called terminal or more than one simplex talkback mobile terminals as called terminals in the rest N-1 simplex talkback mobile terminals, and defining the same group number Numb _ g for all the called terminalsx(ii) a The frequency scanning preset unit of the called terminal sets the frequency range scanned by the second receiving unit to contain the working frequency f of the calling terminali；
Step 2, the calling terminal selects the number Numb of the called terminaljOr called terminal group number Numb _ gxThen, pressing PPT key at the calling terminal to make the calling terminal at the working frequency fiInitiating a call;
step 3, judging whether the calling terminal and the called terminal both use the same transceiving frequency, if so, the calling terminal presses a PPT key to execute step 8, otherwise, the step 4 is executed;
step 4, the second receiving unit of any terminal j in the rest N-1 simplex talkback mobile terminals carries out signal capture according to the frequency scanning range set by the frequency scanning presetting unit of any terminal j, and the captured calling terminal i passes through the corresponding working frequency fiThe sent call information is transmitted to a number storage unit of any terminal j;
step 5, the number storage unit of any terminal j analyzes and compares the call information received from the second receiving unit, and the called number Numb in the call informationjThe number of the terminal j is the same as that of any terminal j, or the called number Numb _ g in the calling informationxIf the group calling number is the same as the group calling number of the group of any terminal j, the terminal j is judged to be an effective callCalling and executing step 6, otherwise, judging as invalid calling and discarding invalid calling information;
step 6, the number storage unit of any terminal j analyzes the working frequency of the calling terminal i corresponding to the effective calling information, the working frequency is stored and forwarded to the control unit, the calling prompt is displayed, if any terminal j confirms that the calling is connected, the step 7 is executed, otherwise, the effective calling is ignored;
step 7, the control unit of any terminal j sends the frequency information f of the calling terminal i according to the number storage unitiOperating frequency f of the transmitting unittAnd the operating frequency f of the receiving unitrIs set to fi；
Step 8, any terminal j presses down a PTT key to carry out call answering;
9, after the communication is finished, all the terminals reply the original working frequency to enter a standby state;
wherein N, M is a positive integer greater than 1, i and j are positive integers not greater than N and i ≠ j, and x is a positive integer not greater than M.
4. The method for preventing missed incoming call of simplex intercom mobile terminal as claimed in claim 3, wherein: any terminal j confirms that the call completion is completed by the PTT key.
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