Method and apparatus for providing a private communication system in a public switched telephone network

Description: TECHNICAL FIELD [Detailed description of the invention]

Methods and equipment for providing private communication systems in the public switched telephone network [Background of invention] I. Technical field of invention The present invention is generally a multiparty communication system, more detailed. Incorporates directly into a cellular telephone system or terrestrial telephone system Point-to-multipoint related to private communication networks. II. Description of related technology The mobile cellular phone service has been in use for some time. The service is subordinate In the future, with high output to a limited number of mobile or mobile units in a large area Characterized by the central site that sends. In early cellular systems, Only a limited number of radio channels were available. Therefore, all of the big cities Within the region, the number of wireless phone conversations is limited to the number of available channels Ta. Modern cellular radiotelephone systems have a fairly large number of radio channels ing. Radio channels are subdivided into different subdivisions that make up a given service area By using the same channel frequency within a region (ie, "cell") Effectively increases. Each cell is equipped with a cell site transmitter, that is, a base station. It has been. These base stations do not unduly interfere with reception within adjacent cells. Broadcast at an output level set so that the signal can be sufficiently received at the boundary of To. This allows the chi to be used in one cell according to a predetermined plan. The channel frequency can be reused in other geographically separated cells. this In this way, a large number of channels are available within the metropolis area, which The services provided by will be the same as ordinary wired telephones. There are numerous standards for implementing cellular telephone communications. To those standards , Advanced mobile phone system (AMPS), transfer Global system for mobile communication (GSM) , Includes code division multiple access (CDMA) It is rare. CDMA spread spectrum spread technology is a multiple access communication system. It has significant advantages over other modulation techniques over the system. For example, use CDMA By doing so, rather than by using other multiple access methods Very high spectral efficiency can be obtained. Due to recent development efforts, in CDMA and other cellular systems, between users It is possible to efficiently provide point-to-point communication links. However, various public or private institutions still have dedicated terrestrial mobile radios (L). MR; land mobile radio) Continues to rely on communication. This is cellularsis Due to the inability of the system to build a "one-to-many" communication network between member users To. For example, local law enforcement agencies use the LMR network. LMR communication In the network, a closed wireless communication system is established via a relay station. like this Closed LMR networks are often push to ta (PTT) lk) Characterized by operation. That is, the user becomes another member user When trying to broadcast voice information, the call button on the handset (handset) Press something similar. However, having a relay station in a vast area Is infeasible, so the range where group member users can be geographically dispersed is controlled. Limited. Cellular telephone systems and traditional terrestrial telephone systems are geographically separated It can facilitate communication between users, but it is a closed "PTT type" communication network. The network has not previously been incorporated into any system. Of this cause One automatically joins the identified group users to such a network There was no convenient mechanism. In addition, such a mechanism is available Easy to connect to unauthorized third parties, if any It is possible and therefore unsuitable for secure communication. Conference call function (co) provided by cellular carriers and terrestrial carriers nference calling capability) is also not a substitute for PTT type communication networks Appropriate. Especially in different cellular or terrestrial systems In order to make a conference call between users, it is necessary to coordinate with the corresponding service provider in advance. There is a need. In addition, in many conference call systems, from conference call participants The information signals are combined and the resulting composite signal is Generally supplied to each participant. This is a means of increasing communication security It is efficiently eliminated to encrypt each such information signal individually. Because Because individually encrypted information signals are generally not recoverable from synthetic signals. is there. Therefore, it is necessary to coordinate the object of the present invention with the telephone service provider in advance. Directly within a cellular telephone system and / or a terrestrial telephone system Incorporate a private communication network Is. Another object of the present invention is to characterize a private communication network by PTT operation. It should be comparable to the existing LMR communication network. Yet another object of the present invention is to use a control device for a private communication network on an existing ground surface. Make it exist in the network call management device individually connected to the line telephone system That is. A further object of the present invention is to improve the security of communication within a private communication network. The step is to make encryption technology applicable.

[Outline of Invention] In the present invention, a plurality of member users communicate using the public switched telephone network (PSTN). It is aimed at the telecommunications network. Each member user directly to the PSTN PST via a connected modified terrestrial telephone or wifi communication system Use a modified mobile phone that is operatively coupled to N. Private communication network , Telephone network for establishing telephone connections with each of the multiple telephone lines of the PSTN It has a network call management device that has a contact interface. plural Each telephone line is associated with one of multiple member users. The network call management device is also added to the telephone network interface. Phones selected from connected and active member users The information signal received over the line is used by the remaining non-active member users (non-active me). It has a telephone line switch matrix for supplying to mber users). Ne The network management control device receives from the member user's telephone via multiple telephone lines. A working member user based on a trusted push-to-talk (PTT) request signal -Recognize. The operating member user was, for example, operating before that. Member You who first received the PTT request signal after the member user relinquished the call right Recognized as the Instead, a working member user makes a network call Preliminary for evaluating all PTT request signals ordered by the management device Selected by using established user priority criteria. Each member user's telephone is typically a standard telephone operation and private communication network. PTT operation by network is possible. When formed for PTT operation Each telephone receives input voice or data information from a member user, and Jital processing. The resulting vocoder data pack et) supplies the modem as well as the PTT request signal generated by the member user And the telephone network interface of the network call management device via PSTN A reverse link is sent to the face. Encrypt each phone for all reverse link transmissions, And formed for the corresponding decryption of forward link information from active member users By doing so, the security of the PTT private network will be enhanced.

[A brief description of the drawing] For other purposes and features of the present invention, refer to the drawings for the following detailed description and the attached cleats. It will be clearer by considering the term. Figure 1 shows that the PTT one-point to multi-point private communication network of the present invention can be constructed internally. It shows the components of the telephone system of one embodiment. FIG. 2 shows an example of the network call management device for the PTT private network of the present invention. It is a block diagram of the form of application. Figure 3A shows a terrestrial PTT dual-mode telephone blower with a transmitter and receiver. It is a figure. Figure 3B shows encrypted communication within the PTT private network. FIG. 3A is a diagram of a terrestrial dual-mode PTT telephone changed to. FIG. 4 is a block diagram of an AMPS dual-mode PTT telephone. Figure 5 shows a CD formed for use within the PTT private network of the present invention. It is a block diagram of a MA cellular telephone. Figure 6 is used in a PTT private network where the signal is used in analog tones. It is a block diagram of a network call management device designed for this purpose. Figure 7 shows to communicate with a network call management device that uses analog tones. Indicates a terrestrial telephone line formed in.

[Detailed Description of Preferred Embodiment] I.PTT Private network configuration Figure 1 shows the PTT one-point to multi-point private communication network of the present invention ("PTT private network". It also shows the components of a telephone system of one embodiment in which a work ") can be constructed internally. It is. Referring to FIG. 1, the telephone system of this embodiment is a public telephone network (P. STN) 10, CDMA cellular communication system 14, and analog cellular communication system It has a stem (AMPS) 18. CDMA system 14 becomes CDMA Service compatible mobile radiotelephones (CDMA mobile) 22 and 24 provide. On the other hand, the AMPS system 18 is a mobile radio that is compatible with AMPS. Talk (AMPS Mobile) Facilitates communication with 28 and 30 users. Multiple Network call tube connected to PSTN10 via a number of T1 channels 44 As will be described later, the physical device 40 corresponds to the telephone system according to the embodiment shown in FIG. It forms a private communication network among a plurality of member users. This private communication network includes CDMA and AMPS cellular systems 14 and Can include member users who receive services from one or both of the 18 And / or PSTN10 through a modified terrestrial phone like Phone 48 Can include one or more member users directly connected to. C The DMA and AMPS cellular systems are incorporated within the embodiment of FIG. However, the teaching of the present invention is, for example, a wide area system for mobile communication (GSM). And other cellular aerial interface rules such as Time Division Multiple Access (TDMA) Please understand that case is also related. Before discussing the working principle of the present invention Configuration requirements for CDMA and AMPS cellular communication systems 14 and 18 shown in FIG. I will briefly explain the elements. The CDMA cellular communication system 14 has a plurality of cells. These Central League Two of them also have cell sites (ie "base stations") 56 and 58 It is shown in Fig. 1 as. Each cell is divided into a large number of sectors. Predetermined Communication with CDMA Mobiles 22 and 24 within a sector spans that sector This is done by a cell site transmitter / receiver that provides a wireless range. Base station 56 And 58 can communicate with the wireless transmitter / receiver in each CDMA mobile and PSTN10. It operates to receive and transmit the signal. In CDMA system 14 Data packets with base stations 56 and 58 and CDMA mobiles 22 and 24 It is used for aerial exchange of information between. Phone calls are CDMA Mobile 22 by cell site base stations 56 and 58 And 24 and CDMA Mobile Switching Center (MSC) The route to and from 60 is determined. This CDMA Mobile Exchange Center (MSC) 60 Is generally provided in a mobile telephone exchange (not shown). MSC60 The main purpose of is voice communication between CDMA Mobile 22 and 24 and PSTN10. To provide road connections. For this, the MSC60 is a suitable CDMA base. MSC Modem 62 and CDMA Mobile 22 and 24 by Station 56 or 58 Performs functions such as evaluating data between and. Also, MSC60 is PST Paging CDMA Mobile when receiving a call from N10 and making multiple T1 calls Other tasks such as switching to an available PSTN line via channel 64 Execute. Pairs of MSC modems 62 receive from CDMA mobiles 22 and 24 For analog signals suitable for transmitting digital information signals via PSTN10 Converts and also converts analog signals from PSTN10 to CDMA Mobile 22 and 24 Converts to a digital signal that is continuously sent to. The AMPS cellular communication system 18 also has a large number of cells. these Two of the cells are shown in Figure 1 as having cell site base stations 70 and 72. It is shown. Each cell is divided into a large number of sectors. Within a given sector Communication with AMPS Mobile 28 and 30 is within wireless reach over that sector Made by the cell site transmitter / receiver that provides. Calling the phone is based on the cell site AMPS Mobile 28 and 30 and AMPS Mobile Exchange Center by Districts 70 and 72 Routes to and from the Inter (MSC) 76 are determined. This AMPS mobile exchange center -(MSC) 76 is connected to PSTN10 via multiple T1 channels 80 It has been. II. PTT Private network operation Now, in explaining the operation of the PTT private network of the present invention, it is moved to FIG. Therefore, the block diagram of the network call management device 40 of one embodiment is referred to. .. The terrestrial line or cellular telephone associated with each member user is the network Figure 3 below shows how it is configured to work with the call management device 40. ~ This will be explained with reference to Fig. 5. In the following, modified terrestrial telephone 48, AM Network calls from PS Mobile 28 and 30, CDMA Mobile 22 and 24 Communication link to output control device 40 via PSTN10 uses the term "reverse link" There is. Currently as a member user operating by network call management device 40 The reverse link associated with the specified member user is valid voice if Or assume that it is only one of the reverse links that carry the data information. All other The reverse link is used to supply signal information to the network call management device 40. Wear. From network call management device 40 to each member user via PSTN10 Each of the "forward links" to do is audio supplied by a working member user Or carry data information. As described below, the network call management device 40 It is reformed every time a new member is recognized. As a result of such reformation, reverse phosphorus Voice or data information from newly recognized active member users in Information is a forward link associated with all other member users (formerly active member) Supplied to (including user forward links). The network call management device 40 is a network controller (network system). It has a device) 90, and this network controller 90 is the first (firs) t) Less associated with PTT private network member users Both have one phone number list stored. First to PTT private network If you want to access, the calling member user is the first PTT private network Dial the access number that identifies the file. Also, network control -La 90 can also memorize other lists of member users. Each list is A separate PTT private network that is associated with a unique access number It defines the network. The network call management device 40 is a PS as a private branch exchange (PBX) system. Designed to appear on the TN10. Therefore, depending on the calling member user Call was made Te is, T1 channel 44 noise is received by one or Re. Regarding this Multiple T1 channels 44 associated with the calling member user in a row Telephone network to connect with one of the network management modems 98 (T1) Interface 92 is provided. As described below, this T One interface 92 is also one of various other network management modems 98 Connect one to one of the T1 channels 44 associated with other member users Play a role. Calling member user receives service by CDMA cellular system 14 If so, the net connected to T1 channel 44 to receive the incoming call MSC Modem 62 with Work Call Management Modem 98'assigned to a call (Figure 1) Synchronize with one of the to establish a telephone connection. Ground line telephone or AMPS Even for the calling member user who has a ruler phone, within the member user's phone Network management mode to receive part modems (Figures 3A and 4) and incoming calls When Mu 98'synchronizes, a similar telephone connection is established. In this embodiment, The network management modem 98 is, for example, a so-called so-called well-suited for aerial information transmission. Has an "AMPS modem". PTT private network from member users through one of T1 channels 44 When the incoming call is received, the T1 interface 92 is displayed while making the call. Standard techniques are used to determine the unearned access number. Predetermined Such dialed access numbers for PTT private networks Is communicated to network controller 90 by T1 interface 92 Is done. Also, the T1 interface 92 is associated with the calling member user. A network management modem that can use T1 channel 44 (for example, network) Connect to the network management modem 98'). Once the modem is synced, The network controller 90 may correspond to the called access number The calling user is a member of the recognized PTT private network Request the calling user to send the credentials used to prove that .. Once confirmed to be a member, the network controller 90 will be T1 For interface 92 or selected network management modem 98 Start paging the remaining member users of the recognized PTT private network Command to do. In another embodiment, the T1 interface 92 is E. 1 interface or various other digital or "PBX type" ins It should be noted that it may be a surface. Called by the first of the other recognized PTT private network member users Emitted by outbound network management modem 98 or T1 interface 92 When you answer a network page (ie, a phone call), the data described above Modem synchronization processing similar to ip occurs again. In particular, the member user to be called is A Called if serviced by MPS or terrestrial telephone Member user phone (Fig. 3A and Fig. 4) Internal modem and network management modem 9 Modem synchronization with one of 8 occurs. The called member user is a CDMA cell Caller's network management if serviced by system 14 Modem synchronization occurs between the modem 98 and one of the MSC modems 62 (Figure 1). The MSC modem 62 does not need to be physically close to the MSC60 and is a telephone system. It makes sense that it only needs to be located somewhere in the infrastructure of the system. I want to be understood. When the calling network management modem 98 performs such synchronization, a connection signal is issued. Live. This connection signal is detected by the network controller 90 .. The network controller 90 then calls the called network tube. Recognized PTT Private Network Access Number for Modem 98' Instruct the member user who dialed the first to send a connection signal. Also, The network controller is a certified participating member of the PTT private network Regularly send each user a list of currently participating member users You can also. This list is displayed on each certified user's phone. PTT controller 104 joins the recognized PTT private network Features of conversation or data transmission between two or more member users It is provided to give a scripture. In particular, the PTT controller 104 is recognized There is a terrestrial line associated with a member user of the PTT private network Or respond to a PTT request signal (PTT request) generated by a cellular phone .. Detecting voice activation of member users in response to manual operation of PTT switch In response to, each PTT request is generated on the member user's phone. Predetermined PTT requests from member users are inspected by the modem 98 assigned to them. Is issued. Modem 98 feeds the PTT signal to the PTT controller 104. In one embodiment, the PTT controller 104 is the previous operating member user. First PTT request received following network call rights released by the user Designate the person who sent the message as the currently operating member user. Manual PTT communication In the event of an issue, by disconnecting the PTT switch on the speaker's phone , Network call rights are waived by the previous active member user. sound In the case of voice-activated PTT signal generation, network call rights are preset. Abandoned due to duration interruption. In another embodiment, a network call is made by a currently active member user. PTT requests received before the waiver is ordered. Currently in operation Ordered PTs when member users subsequently renounce network calling rights The T-request is a preset basis for determining the next currently active member user. It is evaluated according to the quasi. Such preset criteria are, for example, member Yu Includes the priority of the user and the order of receipt of ordered requests. The network call management device 40 is newly activated based on the received PTT request. Other technologies can also be used to select members within. For example, place Each member user of a fixed PTT private network is relative within that network Priority can be given. In this case, it is superior to the currently operating member user When a PTT request is received from a member user with a high priority, the network call tube The physical device 40 takes up the call right of the currently operating member user and has a high priority. Give network call rights to new member users. Also, in case of emergency, network communication As a means of obtaining the right to speak, each member user writes in the network call management device 40. To be able to change its priority within the defined range that is remembered It is also possible. A new active member user can use the PTT controller based on the received PTT request. After being recognized by the troller 104, the PTT controller 104 has multiplex Mo that forms the switch and is exclusively associated with the currently active member user Rverse link voice or dat from dem 98 Arrange the multiple switches 110 to receive a information). That is, Reverse link information from each of the other modems 98 is provided by the multiplex switch 110. It will be ignored. Note that each of the modems 98 is the remaining (ie, non-working) member. Assigned to a user. In addition, the PTT controller 104 has multiple switches. Arranged Itch 110 and received from a newly recognized working member user Deliver reverse link information to modem 98 associated with each non-working member user To supply. Since PTT requests are only communicated via the reverse link of the non-working member user , Such a PTT request is to receive reverse link information from a working member user. Does not affect. The forward links for each PTT private network are from nominally active member users. Used to carry voice or data information to all other member users, The network controller 104 is also used for information transmission by active member users. Communicating system status information via forward links during pauses or gaps Can be done. In one embodiment, this system status information includes: (i) Eligible member users of PTT private networks (phone number, name, priority) ) (ii) Member users (phone number, name) currently participating in the PTT private network ,Priority) (iii) Currently active member users (phone number, name, priority) (iv) PTT tone requests are supplied and ordered to PTT controller 90. Member users (phone number, name, priority, request order) This network status information is received on the phone associated with the member user Is displayed as well as being displayed. In the next section, the PTT private network of the present invention An example of a PTT dual-mode telephone suitable for use in a telephone will be described. III. Ground Line and Cellular PTT Dual Mode Phones Referring to FIG. 3A, a terrestrial PTT consisting of a transmitter 140 and a receiver 142. A block diagram of a dual-mode telephone is shown. Dual mode phone in Figure 3A When the input switch 148 is tilted to the pole 150 side, the input micron 154 is connected to PSTN10 and configured for standard phone operation It has been. PTT Transmission unit 14 for PTT operation in private network When 0 is configured, the input switch 148 is tilted to the pole 158 side. Similarly The receiver 142 is standard when the receiver switch 162 is tilted to the pole 168 side. It was set to allow telephone operation, and the receive switch 162 was tilted to the pole 166 side. Sometimes it is set to allow PTT operation. During PTT operation, audio information from microphone 154 is sent by switch 148. It is linked to codec 172. Codec 172 contacts switch 148 This analog audio or data information from a subsequent peripheral (not shown) To convert to a pulse code modulation (PCM) waveform supplied to the vocoder 176 Is located in. In one embodiment, the vocoder 176 is an EIA (electro). To meet the Nix Industry Association) / TIA (Television Association) standard IS-96A Converts the input PCM waveform into a series of vocoder data packets .. These vocoder data packets are the first of the microprocessor 178. Supplied to the input. Also, the microprocessor 178 is a PTT processor 1 It has a second input connected to 84 and an output connected to modem 180. PTT When switch 188 is closed by the associated member user, PT T-processor 184 provides PTT data packets to microprocessor 17 Supply to the second input of 8. Microprocessor 178 then PTT data -Interleave the packet with the vocoder data packet and The result is supplied to the modem 180. This allows the net during PTT operation. It will be synchronized with one of the work management modem 98. PTT processor 1 84 is shown as functionally different from microprocessor 178 However, both of these functional elements should be integrated into a single microprocessor unit. You can also. The receiver 142 has a modem demodulator 192. Modem demodulator 192 Companion network management within network call management device 40 during PTT mode operation It will now be synchronized with the modem (companion network medem) 98. That relationship Second modem 192 in response to forward link information from inter-network management modem 98 The vocoder data packet generated by is the IS-96A vocoder in the receiver. Supplied to Dar 196. The vocoder 196 is the received vocoder datar. PCM signals are generated in order from the ket. This signal is the codec 200 of the receiver Used by. The analog output from the codec 200 was then followed by conventional electricity. It is supplied to the talk speaker 204. Keep in mind that codecs 172, 200 The function performed by is that it can be achieved by a single device. same As such, the vocoder 176's encoding function is boco in a single device. It can be combined with the decoding function of the data 196. As shown in FIG. 3A, the network management device 40 by the receiver 142 Some information received from the microprocessor 178 via signal line 212 Is supplied to. This information is displayed by the microprocessor 178 in the conventional display. Various networks to be supplied to the No. 214 (eg LCD screen) Status data (for example, other related member users, currently active member users) -Identification data) is included. Figure 3B is modified to facilitate encrypted communication within the PTT private network. Figure 3A shows a ground-line PTT dual-mode telephone. In particular, Figure 3A Another transmitter 140'for telephones is the IS-96A vocoder 176 and microp It has a cryptographic module 210 interposed between it and the roseser 178. Kazumi In the form of application, the cryptographic module 210 is an industrial standard algorithm, eg, de. Encrypts vocoder data packets based on the Data Encryption Standard (DES). Similarly, another receiver 142'is a vocoder generated by the second modem 192. -Has a cryptanalysis module 214 for removing encryption from data packets doing. Another point to keep in mind is the machine made by codecs 172, 200. Noh can be achieved by a single device. Similarly, vocoder 1 76 encoding features vocoder 196 decorating in a single device Can be combined with the ding function. In addition, the encryption module 210 and The functions of the decryption module 214 can also be combined within a single device. Wear. All of a PTT private network that can be involved in encrypted communication Ground lines and cellular phones associated with member users are of this type as well. Cryptographic module and cryptanalysis module of. The terrestrial telephone user in Figure 3B is designated as the currently active member user. The microprocessor 178 then generates an encryption identification number (ID). , Communicate to the network call management device 40. Cryptographic ID is a cryptographic module A special "key" used to decrypt the encrypted information generated by Le 210. Can be linked. The network call management device 40 sets the encryption ID for the remaining non-production. Many for each phone associated with a dynamic (ie, non-calling) member user Multicast. Each non-working member user has a decryption module It has a decryption module similar to 214. Each decryption module is basic Lookup that recognizes the decryption key associated with each encryption ID Has a table. Therefore, each non-working member user is given a given darkness. Cryptography from the currently active member user by receiving the issue ID The information can be decrypted. Referring to FIG. 4, AMPS dual consisting of transmitter 240 and receiver 242. A block diagram of the mode PTT phone is shown. AMPS dual mode in Figure 4 PTT telephone transmission unit 240 inputs when the input switch 248 is tilted to the pole 250 side. Microphone 254 is connected to AMPS transmitter 255 for standard phone operation It is configured so that it can be done. PTT PTT operation within a private network is possible When the transmission unit 240 is configured as such, the input switch 248 is on the pole 258 side. Be defeated. Similarly, in the receiving unit 242, the receiving switch 262 is tilted to the pole 266 side. At that time, it is set to allow standard telephone operation, and the receive switch 262 is set. It is set so that PTT operation can be performed when it is tilted to the side of the pole 268. During PTT operation, audio information from microphone 254 is sent to switch 248. Therefore, it is connected to the codec 272. Codec 272 is this analog audio Pulse code modulation (PCM) wave feeding information to IS-96A vocoder 276 Convert to shape. The resulting vocoder data packet is selectively encrypted Encrypted by module 278. If you don't want encryption Data packets are interlo with PTT packets from PTT processor 284. Supplied to microprocessor 279 for use. Again, PTT package Is emitted by the PTT processor 284 in response to the operation of the PTT switch 288. Be born. Interleaved vocoder data and PTT packets are transmitted Processed by road modem 280 and transmitted to AMPS base station 70 or 72 Supplied to AMPS transmitter 255 for. In other embodiments, peripheral devices (figure). Data information from (not shown) is cryptographic module 278 or directly micro It can be supplied to processor 279. The receiver 242 is a forward link provided by the network call management device 40. It has an AMPS receiver 291 for receiving information. AMPS receiver 29 The analog output from 1 is connected to the receive path modem 292. Modem 292 Synchronizes with the network management modem 98 while operating in PTT mode. Vedanā The vocoder data packet generated by the communication modem 292 is an encrypted PT. T Supplied to decryption module 294 during private communication. Not encrypted When the vocoder data packet is a PC used in the receiver codec 300 Processed by receiver vocoder 296 to generate M signal. Codec The analog output of 300 is supplied to the conventional telephone speaker 304. Dark When the number is changed, private network status information and network management device 40 The same type of information received from is decrypted and passed through signal line 212. It is supplied to the Icroprocessor 178. Codecs 272 and 3 again, as discussed with reference to FIGS. 3A and 3B. Keep in mind that the functions performed by 00 can be performed on a single device. I'm sorry. Similarly, the coding function of vocoder 276 is the demodulation function of vocoder 296. And can be done with one device. In addition, cryptographic module 278 and cryptography The functionality of decryption module 294 can also be combined into a single device. Figure 5 shows a CDMA cell formed for use within a PTT private network. -The block diagram of the telephone is shown. The CDMA cellular phone in Figure 5 has a CDMA transmitter. It consists of 340 and CDMA receiver 342. Microphone 354 while PTT is in operation The audio information from is a codec 37 that produces a pulse code modulation (PCM) waveform. Supplied to 2. The PCM waveform is supplied to the vocoder 376, where it is sequentially encrypted. Vocoder data packets for selective encryption within joule 378 can occur .. When encryption is not desired, the vocoder data packet is a PTT processor. Microprocessor for interleaving PTT packets from 384 37 Supplied to 9. Again, the PTT packet responds to the operation of PTT switch 388. And the interleaved bocorder de produced by PTT Processor 384 Data and PTT packets are CDMA transmitter 3 by microprocessor 379 Supplied to 55. The CDMA receiver 342 has a CDMA receiver 392. CDMA reception The machine 392 responds to the forward link information from the network call management device 40 and is bogged down. -Generates a data packet. Vocoder data packets are encrypted P Supplied to decryption module 394 during TT private communications. Not encrypted In that case, the vocoder data packet is used by the CDMA receiver codec 400. Processed by CDMA receiver vocoder 396 to generate PCM signal Be reasoned. The analog output of the CDMA receiver codec 400 is a conventional electric power Supplied to the talk speaker 404. Made by codecs 372 and 400 Functions can be performed with a single device, as well as vocoder 376 and vocoder 3 96 functions can also be performed in one device. In addition, cryptographic module 3 The functions of 78 and cryptanalysis module 394 can also be combined within one device. Can be done. IV. Analog PTT Private Network Figure 6 is for use in a PTT private network that uses analog tones for signal communication. Shows the functional block diagram of the network call management device 450 designed to be .. The network call management device 450 has a network controller 490. To do. Inside the network controller 490, there is a corresponding PTT private network. One or more phone number squirrels associated with a member user Is remembered. Call when you want to access a PTT private network The side member user gives the access number that identifies the PTT private network. Dial. The network call management device 450 is used as a private branch exchange (PBX) system. Designed to appear in STN10. Therefore, by the calling member user The call made is one of multiple network management tone detectors 498. Received on T1 channel 44 associated with. Receive incoming calls The tone detector 498'outputs a detection signal on the output line 500'. Output line 50 The 0'detection signal is detected by the network controller 490. And Network controller 490 to authenticate the calling PTT user Tone sea detected by the called network management tone detector 498' Take a closer look at Kens (tone sequence). Access Nan once dialed The bar is recognized by network controller 490 and the associated PT When the private network is identified, the network controller 490 will mark it. Identified by the remaining T1 channel 44 using quasi-telephone network procedures Paging of member users of the PTT private network is started. Identified The first of the other member users of the PTT private network to call the network Upon detecting that it responded, network controller 490 was identified. To the member user who first dialed the access number of the PTT private network Sends a connection signal in the form of a tone. Thereby, the calling member user is identified. At least one other member user participated in the PTT private network Indicates that you are. PTT controller 504 joins the identified PTT private network Prepare to grant call rights from two or more member users To. In particular, the PTT controller 504 is an identified PTT private network. Analog tones generated by the phone associated with a member user of Respond to a PTT request signal in the form of one or a combination of'PTT tone requests') To. Each PTT tone request responds to the means operation of the PTT switch or meets. Occurs on a member user's phone in response to detecting a member user's voice activation Is done. A PTT tone request from a member user is the toe assigned to it Detected by detector 498. And the tone detector 498 is a PTT request signal. Is supplied to the PTT controller 504 by one of the output lines 500. Embodiment Now, the PTT controller 504 is related to the PTT controller 104 (Fig. 2). Call from the requesting member users by the method already described in the related part It works to assign rights. New active member users will receive a PTT tone request based on the PTT Identified by the controller 504. PTT controller 504 is currently Reverse link sound from T1 channel 44 associated with a working member user Multicast switch (mult) to receive voice or data information exclusively icast switch) Form 510. That is, each remaining (ie, non) From each of the other T1 channels assigned to one of the (active) member users Reverse link information is multicast by multicast switch 110 Absent. In addition, the PTT controller 504 is a newly recognized active member unit. The reverse link information received from the user is associated with each non-operating member user. Form multicast switch 504 to supply to the existing T1 channel To. PTT tone requests are only sent to the reverse link of the inactive member user Therefore, such a PTT tone request is a reverse link from a working member user. Does not interfere with the receipt of information. Is the forward link for each PTT private network generally a working member user? Used to carry their voice or data information to all other member users Therefore, the network controller 504 is information from the operating member user. The system status information is transmitted to the forward link during the period of transmission cancellation or gap. In embodiments, this system state information includes: (i) Eligible member users of PTT private networks (phone number, name, priority) ) (ii) Member users (phone number, name) currently participating in the PTT private network ,Priority) (iii) Currently active member users (phone number, name, priority) (iv) PTT tone requests are supplied to PTT controller 490 and ordered. Member users (phone number, name, priority, request order) Such information is a sequence of tones that can be detected in each member user's phone. Alternatively, it can be transmitted using a combination of tones. Various PTT private networks Network information (ie member user list, priority), and network By receiving the associated tone or combination of tones from the call management device 450 Special registrations reclaimed for display are stored in each member user's phone .. In this regard, the PTT integrated by the network call management device 450 See Figure 7 for a terrestrial telephone line configured for use within a private network. Will be described below. Figure 7 shows transmitters and receivers designed to communicate using analog tones. A block diagram of a terrestrial PTT telephone with parts 540 and 542 is shown. P During TT operation, the input switch 548 is usually P from the input microphone 554. Pole 55 by PTT processor 552 to combine audio information with STN Set to 0 side. However, PTT switch 560 is now a member user So when connected, the PTT processor 552 will switch 548 to pole 56. Set on the 2 side. This allows the tone generator 566 to be used. toe Allowing PTT tone requests generated by generator 566 is a network call It is transmitted to the output control device 450 via the PSTN. The receiver 542 calls the speaker 568 and the network during PTT mode operation. Detects analog tones transmitted by management device 450 or their combination It has an internal tone detector 570. These tones or combinations of tones It is used to carry various state information and control information to the PTT telephone shown in Fig. 7. Implementation In the form of, this information includes: (i) Identification of currently active member users (name, priority) (ii) The member user associated with the PTT phone is given the right to call. Display with (iii) Higher priority for member users' call rights associated with PTT phones Notification of cancellation for member users with ranking (iv) Identification of member users currently participating in the PTT private network Each tone or tone combination is stored in the display processor 574. Associated with other messages and continuous characters. Each detected tone or toe In response, the display processor 574 sends the associated message in English. Supply to the numeric display 578. The state information and control information listed above are It is merely an example, and in other examples network management of other types of information. The device may supply the PTT telephone. The above description of preferred embodiments will be described by those skilled in the art in making or using the present invention. It is provided so that it can be used. Various to the embodiments described above Improvements are readily apparent to those skilled in the art and are general principles defined herein. No inventive talent is required to apply to other examples. Therefore, the present invention It is not limited to the embodiments shown here, but is new to the principles shown here. It is provided over a wide range in line with its unique characteristics.