System providing information content for surface mobile radio station using cellular data transmission network

The present invention relates generally to land mobile radios, and more particularly to a system for providing content terrestrial mobile station using a cellular data network.

Land mobile radios may be used to provide communication between different mobile units, for example land mobile radios. Strips Feedback land mobile radios, such as public safety radio communications (such as police, fire department, etc.) are generally available in the bands to skip the very high frequency, ultra high frequency, 700 MHz and 800 MHz. A portion of each of the frequency bands allocated Federal Communications Commission (FCC) has for the communication services of public safety, and also named as "frequency bandwidth of public security." These connections can also be provided using private land mobile radio services objects (PLMRS).

Mobile communication network also provides a link between different mobile users, such as cell phones. These cellular data network continues to grow and allow uninterrupted growth set of applications, making it available to users. For example, the cellular data network services now provide "push to talk" (PTT), which provides a direct connection. Thus, the user of the cellular telephone communication channel may require a direct connection with another cellular phone user in a two-way radio or a portable two-way radios. As another example, the cellular data network provides services to high-speed data transmission, for example, GPRS (General Packet Radio Service data (standard for data transmission in cellular networks)) technology, EDGE (promising technology for mobile radio), EV-DO technology, and Universal Mobile Telecommunications System UMTS.

Known systems providing enhanced services and capabilities, such as improved ability to call or radio links that may be used, for example, wireless networks solutions mission-critical applications, such as for applications public safety, using commercial personal service modem radiotelephone such as postal services and telecommunications to improve and / or replacement of traditional systems of land mobile radios. These systems are provided using a special gateway interface equipment, which provides some interoperability between the land mobile radio and cellular data network with the capabilities of PTT, by converting and / or transforming data or voice communications between networks, such as from a network of terrestrial mobile radios the cellular data network.

In the land mobile radio industry also provided new technologies, including the use of digital communication instead of analog communication. In addition, the system terrestrial mobile stations currently using packet switching instead of circuit switching, for example, using Internet protocol interaction (IP) and Voice over IP-protocol (VolP), to give the possibility of obtaining a highly scalable and cost effective networks of terrestrial mobile stations.

So far, the mobile radio network of ground traditionally used for applications for solving mission-critical tasks, such as public safety communications. In addition to providing a very high level of system availability, land mobile radio network, primarily designed to support PTT services (postal services, telegraph services), such as work scheduling mode. In networks of land mobile radios PTT services are often configured to operate in connection with certain predefined or working groups. For communication purposes workgroups further may be organized into groups of calls. In the Users and managers radio tuned to a group PTT calls. Land mobile radio network is configured so that all members of the working group took the transfer station in the special group of telephone conversations.

Aside from the PTT service network of ground mobile radios may also include a range of features to support multiple applications solutions for mission-critical tasks. For example, applications in public safety land mobile radio networks provide a number of emergency services, for example allow the user in distress, the ability to activate the emergency alert by pressing a single button. Net land mobile radios also provide a variety of services and priority preemption line. These services provide access to the system the most important means of communication when there are insufficient resources and inadequate capacity of the system to manipulate all parallel PTT calls.

These systems use a terrestrial mobile radio specific protocols wireless data terrestrial mobile radio to establish a wireless communication between the radio and land mobile radio infrastructure land mobile radios. Prior art systems to provide added functionality or terrestrial mobile communications station, such as PTT, in a public network, such as public cellular data network, broadcast or transform data or information transfer, for example using VolP protocols in the subscriber station-radio devices. Thus, these systems require additional controls and equipment to implement mutual connection, and complicating udorozhit in accordance with the overall system.

The solution is provided by a method for transmitting content terrestrial mobile radio. The method includes transmitting content terrestrial mobile radio station via at least land mobile radio network or a cellular data network. The method further includes encapsulating the payload terrestrial mobile stations using a protocol packet, the transmission of content through terrestrial mobile cellular radio data network.

The solution is also provided by a wireless communication system that includes a land mobile radio infrastructure packet configured to establish communication with a plurality of terrestrial mobile radio units via at least land mobile radio network or a cellular data network. The wireless communication system further includes an interface configured to process received content terrestrial mobile radio station in the protocol of the encapsulated packet.

The solution is also provided by a digital signal included in the electromagnetic signal modulated information transmission, and includes an information part and a land mobile radio part protocol encapsulation packet.

Now, the present invention will be described with reference to the accompanying drawings.

1 - block diagram of a terrestrial mobile communication stations obtained in accordance with the typical embodiment of the present invention.

2 - block diagram of a public land mobile radio communication system illustrated in Figure 1, land mobile radio, prepared in accordance with the typical embodiment of the present invention.

Figure 3 - a block diagram illustrating protocol stacks ((prim.per.) Sets of interrelated protocols at different levels, operating on the network at a time) in accordance with a typical embodiment of the present invention.

4 - block diagram of a method for controlling the transmission of content in terrestrial mobile radio communication system, land mobile radio, in accordance with a typical embodiment of the present invention.

5 - a block diagram of a method of processing content terrestrial mobile radio station in accordance with a typical embodiment of the present invention.

Figure 6 - a block diagram of an interface protocol with the packet received in accordance with a typical embodiment of the present invention.

7 - block-diagram illustrating the formatted information content terrestrial mobile radio station in accordance with a typical embodiment of the present invention.

8 - a block diagram of a terrestrial mobile communication stations obtained in accordance with the typical embodiment of the present invention illustrating a communication service area.

9 - a block diagram of a terrestrial mobile communication stations obtained in accordance with the typical embodiment of the invention illustrating the flow of data.

Various embodiments of the present invention include a system for providing content public land mobile radios, e.g. land mobile radio services using cellular data networks. The information content of a public land mobile radios saves application layer land mobile radio, but instead of using frequency bands terrestrial mobile radio station with the transport protocol land mobile radio content terrestrial mobile station is transmitted using frequency bands area serviced by cellular stations via the cellular data network packet.

It should be noted that in those cases where in this specification reference is made to the content, this refers generally to any type or kind of the speech content and / or content data, and can restrict the specific services, the operations of adjustment and so on ground mobile station. For example, content terrestrial mobile stations may include, but not limited to, voice data, data alarm, control data relating to selecting a particular group of telephone calls, data terrestrial mobile station for transmission between unit station and the server, reprogramming data (e.g. , software upgrade data), and so on.

In particular, as shown in Figure 1, a wireless communication system, and more particularly, communication system 20 land mobile radio, received in accordance with various embodiments of the present invention provides communication between a plurality of blocks 22, land mobile radio terminals or mobile land stations. Communication between the blocks 22, land mobile radio network 24 is provided by means of terrestrial mobile radio network 26 or cellular data. Each of the blocks 22, land mobile radios configured to provide communication, for example, with other blocks 22 land mobile radio network 24 using land mobile radio and cellular network 26 transmission. In particular, each of the blocks 22, land mobile radios configured for switching between a network 24, land mobile radio and cellular network 26, transferring data, for example, based on the available network, available bandwidth, the coverage (coverage area), the signal level in the channel communication and so on. Optionally, or in another embodiment, switching between the block land mobile radio network 24 and the terrestrial cellular mobile radio network 26, data communication based on the type or contents. Thus, in addition to providing communication over a network 24 of terrestrial mobile radio service wireless cellular data network 26, data can be used to maintain the communication link and / or transport of application layer protocols, land mobile radios.

Various embodiments enable overlay through service modes terrestrial mobile stations to the cellular network 26, a data providing in accordance with this example, the feasibility of systems terrestrial mobile stations for solutions mission-critical tasks in the service area of ​​the cellular network 26 transmission. To provide this functionality, and transmitting content terrestrial mobile station using a cellular network 26 transmission data each of the blocks 22, land mobile radio is provided a cellular modem device cellular radio to enable operation through service modes and application layer protocols between blocks 22 land mobile stations and infrastructure terrestrial mobile radio packet.

More specifically, and as shown in Figure 2, unit 22 land mobile radio station includes a plurality of modules or components configured to provide communication via a network 24 of terrestrial mobile radio network 26 or the cellular data transmission. In particular, the control unit 22 land mobile radio station includes a module 30 application land mobile radio, connected to the transport module 32 for configuring voice and / or data for communication via the network 24, land mobile radios (having one or more central stations 46 in a mobile terrestrial mobile radio communication) using transceiver 34 which can consist of separate units or provided as a single transceiver. Application module 30 land mobile radio station, the transport unit 32 and the terrestrial mobile radio transceiver 34, in general, limit the communication part 40 the block 22 land mobile radios. Block 22 land mobile radio station further includes a data encapsulation module 36 land mobile radios to encapsulate voice and / or data for communication via the cellular data network 26 using a cellular radio modem 38. Application module 30 land mobile radio unit 36 ​​of the encapsulation terrestrial mobile radio and cellular radio modem 38 generally limit the communication part 42 of the cellular data network 22, block land mobile radios.

Block 22 land mobile radios may also include additional components such as an antenna (not shown) to be used for receiving and transmitting signals. In addition and as an example the block land mobile radios 22 may include filters (not shown), such as the reception filter and transmission filter to filter the signals that are received and transmitted respectively block 22 land mobile radios. Block 22 land mobile radios may also include, for example, a switch (not shown) or other controller for switching between the communication portion 40 of the public land mobile radio communication part 42 and the cellular data network.

In the system 20 is land-mobile radios can transmit data via the terrestrial mobile radio 24 using different known protocols, such as protocols, wireless data channels. For example, these protocols are wireless data channels include among others Project 25 (TIA 102) and TETRA standards ESTI. These protocols are wireless data channels terrestrial mobile station determines the format and procedures for exchanging data between the unit 22 and the terrestrial mobile radio network 24, land mobile radio, and in particular, the central station 46 to the mobile communication system terrestrial mobile radio. It should be noted that in cases where the central station (base stations) 46 to the mobile communication system is part of a larger system, the central station (base stations) 46 to the mobile communication system is connected to switching equipment (not shown), which routes the voice and data between different parts of the system, for example, other base stations in a mobile communication system or other remote distribution.

As is known, the central station 46 to the mobile communication system terrestrial mobile radio processing such manipulates speech, data and control information received over wireless communication channels in an alternate format suitable for communication in the network 24 land mobile radios, e.g., for transport to switching equipment . For example, the received discrete voice, data and control data are known to be encapsulated in TCP / IP packets or UDP / IP to the resulting packets IP, transmitted between the central station (base stations) 46 to the mobile communication system, land mobile radio and switching equipment network IP.

Block 22 land mobile radios can also provide communication via the cellular network 26 data using various well-known protocols, such as, among other GPRS (General Packet Radio Service Data (standard for data transmission over cellular networks)), the technology EDGE (promising technology for mobile radio ), EV-DO technology, and universal mobile telecommunications system UMTS and 802.16 standards. These cellular protocols specify the format and procedures for exchanging data between the unit 22 and the terrestrial mobile radio, in particular cellular radio modem 38 and cellular network 26 transmission.

For example, the antenna mast cellular network (not shown) having a central station (not shown) in the mobile communication network may be provided for receiving and processing signals from the unit 22 land mobile radio manipulates accepted speech, data and control data, in an alternate format suitable for communication within the cellular data network 26, e.g., for transport to a router and server (not shown) based on an IP address for the received data packets. For example, received encapsulated signals are de-encapsulates and appropriately routed within the cellular data network 26.

Thus, a transfer of data from the network of 24 land mobile radios or cellular network 26 data infrastructure 41 land mobile radio packet switching. It should be noted that the content of a public land mobile network of ground stations and mobile radios may be configured based on different protocols, wireless data channels. To ensure communication network 24 via the terrestrial mobile radio network 26 or cellular data communication unit 22 by using the public land mobile radio communication protocol stacks for communication with each of these networks dismembered, as illustrated in Figure 3. In particular, with regard to the connection unit 22 land mobile radio station using a network 24 of terrestrial mobile radios, the stack 60 protocol land mobile radio station is divided into a plurality of levels, which in the exemplary embodiment of the present invention is a two-level protocol stack having an application layer 62 of ground mobile radio and transport layer 64 land mobile radios. The application layer 62 and transport layer 64 may be land mobile radios be provided, for example, by application module 30 land mobile radio and transport module 32 land mobile radio (both illustrated in Figure 2), respectively. The application layer 62 land mobile radios configured to provide interpretation and processing of voice, data and control data and the transport layer 64 land mobile radios configured to allow flow of speech, data and control data via a transmission medium. As described herein, the protocol of wireless data transmission channel determines how the application layer 62 land mobile radio, and the transport layer 64 land mobile radios.

In this two-level model of the protocol stack the central station 46 (shown in Figure 2) in a mobile communication system land mobile radio and switching equipment on the network 24 (illustrated in Figure 2) land mobile radios take the content of the communication part 40 (of FIG .2) public land mobile radios and transmitting the application layer content terrestrial mobile radio 62 therebetween with a different transport layer. In particular, and as shown in Figure 3, content application layer 62 is encapsulated at the central station 46 (FIG. 2) in a mobile communication system using known to encapsulate content data 66 land mobile radios. In a specific embodiment, discrete transmission units are encapsulated within transport datagrams, and in particular, transport datagrams 68 packet, which is transmitted using a transport protocol. When receiving an encapsulated datagram may be re-established content and the application layer, in particular deinkapsulirovano.

Furthermore, this two-level protocol stack model enables delivery service application layer via the terrestrial mobile radio network is a wireless terrestrial mobile stations using, for example, the communication part 42 (shown in Figure 2) cellular data network. In particular, cellular communication part 42 is a data network is configured to provide an application layer 62 land mobile radio, but instead of using the transport layer 64 land mobile radio services using a wireless transport network 26, data (shown in Figure 2). In particular, the level 70 of encapsulating data terrestrial mobile radio are used to transport datagrams 68 packet, so that the wireless cellular network 26 transmission communicates with switching equipment using suitable transport protocols, supplying in accordance with the identical services application layer terrestrial mobile radio as the communication part 40 land mobile radio. In particular, the infrastructure 41 (shown in Figure 2), land mobile radio packet establishes communication with the public land mobile services application station using an application layer switching 72 land mobile radio station in conjunction with transport datagrams 68 packet.

It should be noted that the various embodiments of the present invention is not limited to a two-level protocol stack, and may provide additional levels for the multilevel protocol stack as specified or desired. For example, it may provide a variety of circuit-level, such as the level of the group (mass) encryption. Furthermore, for example, may provide levels of RTP (Real Time Transport Protocol).

Various embodiments of the present invention provide a content management connection land mobile radio communication system in land mobile radio network using a land mobile radio and wireless network land mobile radio, in particular wireless cellular data network. In particular, the method 100 is content management land mobile radio is illustrated in Figure 4 and includes determining at position 102 the network to use for transmitting payload land mobile radios. In a specific embodiment, the determination made as to whether the content to be transferred to the public land mobile radio network using a land mobile radio or cellular data network. This determination may be based on a manual selection, for example, based on user input selection of which network to use. The selection can be made, for example, using a button or switch on the unit 22 land mobile radio (shown in Figure 2). Alternatively or optionally, the determination of which network to use may be automatic. For example, selection of a network for transmitting payload land mobile radios may be based on the value of the data stream on a particular network or available bandwidth, the level of transmission priority, the type of communication or content (e.g., speech or broadcast signal of emergency, emergency communication or request PTT) for the signal level for the unit land mobile radio unit geographical location of the public land mobile radio, user preferences and so on.

Once in position 102 a determination is made to use the network for transmitting content, the method of communication is selected at position 104 based on the determined network to use. For example, the speed or data rate in baud communication may be selected (manually or automatically) from a range of communication data rates. Among other things, can be selected by the setting procedure for establishing and connecting to a certain network. For example, if to be used network land mobile radios, it may be implemented method establish communication with a network of terrestrial mobile radios, wherein the communication channel between the block land mobile radio stations and a network of terrestrial mobile stations by a transceiver terrestrial mobile radio block land mobile radios. If to be used cellular data network, the method may be implemented establish communication with the cellular communication network connection that enables the creation of a communication channel between the block land mobile radio and cellular data network via a cellular radio modem unit land mobile radio. The technique may involve the installation, as is known, any adequate process for establishing the wireless link.

Thus, at position 106 the content land mobile radio is configured to transmit based on the determined network and selected method of communication. For example, if the transmission of payload land mobile radios must be used with a network of land mobile radios, the choices made specific standard land mobile radio, in which to configure or format the content public land mobile radios. In particular, the selected standard in which to configure the voice useful and / or data payload defining the content public land mobile radios. This may include, for example, selecting one of the following standards: Project 25 (TIA 102) standard or ESTI TETRA communication method. Furthermore, for example, it may be selected proprietary format, such as a private format OpenSky M / A-COM, proprietary format NetworkFirst or EDACS system.

Further, for example, if the content terrestrial mobile station must be communicated using the cellular data network, then make the choice of a particular standard cellular wireless data network in which to configure or format the content public land mobile radios. In particular, the selected standard cellular wireless data network, which is configured useful speech and / or load information that defines the content public land mobile radios. This may include, for example, selecting one of the following standards: General Packet Radio Service (GPRS), or Enhanced Data Rates for GSM Evolution (EDGE), or Evolution Data Optimized (EV-DO), or Universal Mobile Telephone Service (UMTS), or standard 802.11 communication systems interchangeability.

In addition, and as described in detail above with reference to Figure 3, depending on the network used for transmitting payload land mobile radios may be used a special protocol stack. Also, if the content terrestrial mobile station to be transmitted using the terrestrial mobile radio network, the protocol header is added to the land mobile radio payload data terrestrial mobile radio. If transmission payload land mobile radios must be used cellular data network, the protocol header added packet. As described in more detail below, if the content is a public land mobile radios must be communicated using the cellular data network, then the content terrestrial mobile radio inkapsluliruyut example internetwork communication protocol (IP), the encapsulated IP-packer to transmit data to the cellular communication network or data from the cellular data network. The method of encapsulating the data is described in more detail below with reference to Figure 5.

As also shown in Figure 4, after the content public land mobile radios configured to position 106, at position 108 provides transmission payload configured public land mobile radios. For example, if the content is a public land mobile radios configured to transmit using a terrestrial mobile radio network, the transmitter and receiver are terrestrial mobile radio station can be used for transmitting payload land mobile radios. If the content is a public land mobile radios configured to transmit using the cellular data network, then transmitting the information to complements land mobile radios may be used a cellular radio modem. It should be noted that the cellular radio modem may be configured to operate in one mode of operation, or it may be configured to operate in multiple modes. In another embodiment, it may be provided more than one cellular radio modem, each of which may be configured to operate in one mode of operation or may be configured to operate in multiple modes.

Once content terrestrial mobile radio transmitted and received, for example, the central station of the network, the content terrestrial mobile radio treated at position 110 to determine the effect. For example, this may include determining whether to transmit voice data or generate an emergency signal or PTT request to a group call. For example, if the content is public land mobile radios communicated using the cellular data network, you can be first defined IP-destination address of the encapsulated datagram and then transmits the data in that location for processing using the network router.

In an alternative embodiment, as illustrated in Figure 6, in connection with the cellular network 26, data (illustrated in Figure 2) may provide the interface 120 with a packet switched protocol. Interface 120 protocol packet may be provided, for example, as a separate unit (e.g., stand-alone module) card to connect to the server in the cellular network for transmission of data or software download server (download server) in the cellular network for data transmission . 120 interface protocol packet includes a processor 122 for processing received encapsulated payload terrestrial mobile radio packet to transmit, for example, the infrastructure 41 (shown in Figure 2), land mobile radio packet. In particular, and as more fully described with reference to Figures 4 and 5, the processor may receive content terrestrial mobile radio formatted as shown in Figure 7. The information content of a public land mobile radio, in general, includes a data portion and a land mobile radio part protocol encapsulation packet. In particular, content terrestrial mobile station 130 may include a header 134 switching protocol packet header 134 protocol land mobile radio data and terrestrial mobile station 136, for example payload data terrestrial mobile radio.

This content terrestrial mobile station 130 is essentially encapsulated, for example in IP-encapsulated packer. The processor 122 decapsulates the payload 130 land mobile radios, e.g., removal or recovery switching protocol header 132 and may store packets decapsulated content terrestrial mobile station 130 in the memory 124. Thereafter, the content terrestrial mobile station 130 may be further processed by processor 122 determine the action to be performed, or the addresses in the infrastructure of land mobile radio packet switching, which should be transferred to the content 130 land mobile radio. Essentially, once the information content 130 decapsulated land mobile radio, content 130 land mobile radios configured to transmit terrestrial mobile radio infrastructure, the packet-switched network or a land mobile radio. Transmission control data payload 130 is regulated terrestrial mobile radio controller 126, which may include a router 128 for routing payload terrestrial mobile station 130 to the destination, for example, land mobile radio network. It should be noted that the content of a public land mobile radios may be reinkapsulirovano for transmission within the network or terrestrial mobile cellular radio data network.

As illustrated in Figure 5, a method 150 of processing content terrestrial mobile radio station 152 includes a position determination, should it be transferred content terrestrial mobile radio network using a land mobile radio. If at 152 it is determined that the content of a public land mobile stations to be transmitted using the terrestrial mobile radio network, the content item 154 land mobile radio network is transmitted to land mobile radios. This may involve the transfer of content to the public land mobile radio base station in a mobile communication network terrestrial mobile radio network based on the header protocol land mobile radio, provided in combination with content terrestrial mobile radio. Thereafter, the content is encapsulated in the gap 156, e.g., encapsulation in packer defined protocol of wireless data transmission (on-link), as described herein, and route at position 158, respectively. For example, the encapsulated payload land mobile radios, which can be configured as a datagram, may be routed to infrastructure land mobile radio packet.

At the destination, payload land mobile radio content terrestrial mobile station is processed at position 160, e.g. dekapsulirovaniyu, and then in the position 162 is determined based on the processed action data. For example, at position 162 determination may be made that is to be transmitted or the alarm that the content should be further routed to another base station in a mobile communication system. Thereafter at position 164 the appropriate action, such as a land mobile radio infrastructure of packet switching.

If at 152 it is determined that the transmission of payload land mobile radios will not be realized when using a land mobile radio network, the position information 166 of the public land mobile radio content is encapsulated for transmission. For example, in the exemplary embodiment of the present invention, module 36 (shown in Figure 2) encapsulating the terrestrial mobile radio implements level 70 (shown in Figure 3), land mobile radio encapsulation to encapsulate payload land mobile radio in the wrapper, such as IP-packer. Thereafter at position 168 are transmitted encapsulated payload terrestrial mobile station using a cellular data network. This may include routing (at position 170) encapsulated payload terrestrial mobile radio station in a cellular data network. Then, at position 172 the content terrestrial mobile radio infrastructure transmitted packet, e.g., based on the IP-address of the IP-packer.

After that, the content of mobile terrestrial radio is processed at the destination, which is in position 162 may provide content dekapsulirovanie land mobile radios and certain actions. For example, the determination can be made that is to be transmitted or the alarm content terrestrial mobile radio should be further routed to another base station in the mobile communication network. Then, at position 164 holds an appropriate action, for example, land mobile radio infrastructure of packet switching.

Thus, various embodiments of the present invention provide a content transmitting terrestrial mobile radio network using a land mobile radio network or a fixed ground station, for example, a cellular data network. If the content is a public land mobile radios must be communicated using the cellular data network, then the content terrestrial mobile radio station before transmitting the encapsulated packet switching protocol. For example, and as shown in Figure 9, communication system 200 land mobile radios generally includes multiple base stations 202 in the mobile communication network the transmission data and a plurality of base stations 204 in the mobile communication network mobile ground stations. Each of the plurality of base stations 202 in the mobile communication network the transmission data and a plurality of central station 204 in a mobile communication network of terrestrial mobile radio stations has an associated service area 206, the cellular communications network and a data communications service zone 208 land mobile radio network, respectively. 206 communication service area of ​​cellular data network and the zone 208 communication service network of ground mobile radios may overlap (overlapping) in some locations. Various embodiments of the present invention as described herein, enable unit 210 land mobile radio, such as radio terrestrial mobile radio in a mobile unit or vehicle, to communicate via the cellular data network or a network of land mobile radios, e.g., depending on the location unit 210 and terrestrial mobile station corresponding available coverage area. More specifically, antenna masts (not shown) corresponding to each of the plurality of base stations 202 in the mobile communication network the transmission data and each of the plurality of base stations 204 in the mobile communication network of land mobile radios, allow wireless communication as described in this application.

Furthermore, as shown in Figure 9, the controller 212 infrastructure 41 land mobile radio packet may be configured to control communication of a plurality of base stations 202 in the mobile communication network the transmission data and a plurality of central station 204 in a mobile communication network mobile land stations, as described in this application. The controller may process a plurality of data packets received from each network, land mobile radio 24 and / or network data 26 to determine the adequate action or routing procedure for the particular data packets as described herein.

The various embodiments or components, such as communication system 20, land mobile radios or controllers therein, may be implemented as part of one or more computing systems that can be separated or integrated with the communication system 20 land mobile radios. The computing system may include a computer input device, display interface, for example, for accessing the Internet. The computer may include a microprocessor. The microprocessor may be connected to a communication bus (channel). The computer may also include a memory device. The memory may include RAM (random access memory) and ROM (read only memory). The computer system may further comprise a memory (storage device), which may be a hard disk drive or removable storage device, such as a floppy disk drive, optical disc drive, and the like. The drive may also be other similar means for loading computer programs or other instructions into the computer system.

As used herein, the term "computer" may include any processor-based systems or microprocessor, including systems using microcontrollers, circuits with reduced instruction set (RISC), application specific integrated circuits (ASICs), logic circuits, or any other circuit or processor , capable of performing the functions described in this application. The above are only typical examples, and thus, are not intended to limit in any way the definition and / or meaning of the term "computer".

The computer system executes a set of instructions that are stored in one or more storage elements to process input data. The storage elements may also store data or other information as desired or necessary. Memory elements may be in the form of an information source or a physical memory element in the data processing device (processor).

The command set may include various commands that instruct the computer as a data processing device to perform specific operations such as the methods and processes of the various embodiments of the present invention. The command set can be in the form of a program implemented in software. The software may be in various forms such as system software or application software. Additionally, software may be in the form of a set of individual programs, program module within a larger program or a portion of the software module. The software also may include modular programming in the form of object-oriented programming. The processing of input data by the data processing device may be in response to user commands, or in response to results of previous processing, or in response to a request made by another device for processing data.

As used in this application, the terms "software" and "firmware" are interchangeable, and include any computer program stored in a memory for causing a computer including a RAM (random access memory), ROM (Read Only Memory), EPROM (erasable programmable read only memory), EEPROM (electrically erasable programmable read only memory) and the NVRAM (nonvolatile random access memory). The above types of memory are only typical and therefore non-limiting types of memory used to store the computer program.

It should be noted that the various embodiments of the present invention also may provide different and / or additional functionality. For example, it can be done through (random) encryption, according to the exclusive use of these intermediate encryption equipment and the risks associated with security breaches encountered in the presence of such intermediate devices with access to encryption keys. Moreover, various embodiments of the present invention may provide a through digital encoding of speech, except in accordance with the use of an intermediate transcoding equipment and hence the fidelity loss encountered when converting digital voice format to another format.

In addition, various embodiments of the present invention may provide a function to solve mission-critical tasks, such as PTT (post, telephone, telegraph), Scan (Search calls), priority calls Preemption, emergency alerts and notifications, scanning and Tracking the reception of content, distribution and positioning by the global navigation and positioning (GPS). Options to address mission-critical tasks can be implemented in applications solve mission-critical tasks, including, but not limited to, public security, industry and municipal sector public transportation.