RU2319322C2 - Cell phone - Google Patents

Abstract

FIELD: individual cell communication instruments, namely cell phones.

SUBSTANCE: cell phone contains block of client identification modules - block of SIM-cards, connected to controller, which is in turn connected to central processing unit by means of system bus.

EFFECT: ensured capacity for connection of several phone numbers of different mobile communication operators using one phone.

1 dwg

Description

The invention relates to individual means of cellular communication, namely to telephone sets.

A well-known cell phone containing an antenna, a receiving and transmitting device, a monitoring and control device with permanent and random access memory, a subscriber identity module (SIM card), a keyboard, a display and a power supply unit interconnected via a system bus including a data bus, address the bus and the control bus (RU 2199183 C 2, IPC 7 Н04В 7/26).

As the disadvantages of the known technical solutions, the following can be noted. Known technical solution allows you to selectively select the choice of a service provider and in this regard, to provide or not to ensure the initialization of a mobile device for communication. However, it does not solve the problem of providing communication when moving from the coverage area of one service provider to the zone of another provider without using roaming.

The technical result to which the invention is directed is to ensure, using one telephone, to connect several telephone numbers (for example, work and home, for friends and strangers, for well-known people and few friends, etc., etc. ); connect several phone numbers of different mobile operators, which allows the user to compare the quality of communication, its cost and additional services provided by different operators; allows a mobile user who, by occupation, has stable business connections in another city and has a SIM card of the mobile operator of that city, not to use two mobile phones in order to stay in touch in two different cities, not to change the SIM card in the phone and do not interrupt communication in one of the cities.

The specified technical result is achieved in that a cell phone containing an antenna, a receiving and transmitting device, a monitoring and control device with permanent and random access memory, a subscriber identity module, a keyboard, a display, and a power supply unit interconnected via a system bus including a data bus , the address bus and the control bus, contains several subscriber identity modules combined in a unit connected to the controller, which, in turn, is connected to the device via the system bus PTO control and management.

The invention is illustrated in the drawing, which shows a functional diagram of a cell phone.

The cell phone contains an antenna 1, a receiver 2 and a transmitter 3, a control and management device — a CPU 4 with read-only and random access memory 5, a subscriber identity module block — a SIM card block 6, a keyboard 7, a display 8, and a power supply unit (in the drawing) not shown) interconnected by a system bus including a data bus, address bus, and control bus. The block of SIM cards 6 is connected to the controller 9, which, in turn, is connected via the system bus to the CPU 4.

In addition, the phone contains the necessary elements for work: analog-to-digital converter (ADC) 10, speech encoder 11, channel encoder 12, channel 13 decoder, speech decoder 14, digital-to-analog converter (DAC) 15, equalizer 16, message encryption and decryption unit 17, voice activity detector 18, terminal devices 19.

Brief description of the purpose of the listed cell phone elements.

The control and monitoring device — the CPU 4 with its operational and permanent memory 5 — controls the operation of the cell phone. Processing control signals, polling the keyboard 7, the formation of the necessary frequencies and the output of information on the display 8 occur under the control of the central processor. The control device coordinates the work of all nodes of the cell phone. The functioning of the CPU 4 is based on programs stored in read-only memory (ROM).

Random access memory (RAM) is used to temporarily store data, such as the number of the current communication channel, the installed transmitter power, etc., as well as the results of logical or mathematical operations that are performed during program execution. Reprogrammable read-only memory (RPSD) stores information specific to each particular telephone, for example, a designated cellular telephone number.

The controller 9 of the block 6 SIM-cards is controlled by the CPU 4 and provides interaction with each of the SIM-cards installed in the block 6, or signals its absence.

An analog-to-digital converter (ADC) 10 converts the analog signal from the microphone output to digital form. Moreover, all subsequent processing and transmission of the speech signal is carried out in digital form, up to the inverse digital-to-analog conversion.

Speech encoder 11 encodes a speech signal, which is already digital, according to certain laws using a compression algorithm to reduce signal redundancy. Thus, a reduction in the amount of information that must be transmitted over the radio communication channel is carried out.

Channel encoder 12 adds to the digital signal received from the output of speech encoder 11 additional (redundant) information designed to protect against errors when transmitting a signal over a communication line. For the same purpose, information is subject to certain repackaging (interleaving). In addition, the channel encoder 12 introduces into the composition of the transmitted signal control information from the logical part.

The channel 13 decoder extracts control information from the input data stream and sends it to the logic block. The received information is checked for errors, which are corrected if possible. For subsequent processing, the received information is repackaged with respect to the encoder.

The speech decoder 14 restores the digital speech signal received at it from the channel 13 decoder, converting it into its natural form, with its characteristic redundancy, but still in digital form.

A digital-to-analog converter (DAC) 15 converts the received speech signal into analog form and supplies this signal to the input of the speaker amplifier.

Equalizer 16 is used to partially compensate for signal distortion due to multipath propagation. Equalizer 16 is an adaptive filter, customizable by the training sequence of characters that make up the transmitted information. This block, generally speaking, is not functionally necessary and in some cases may be absent.

Keyboard 7 is a dialed field with numeric and function keys for dialing the number of the called subscriber, as well as commands that determine the operating mode of the cell phone.

Display 8 is used to display various information provided by the device and the operating mode of the station.

Block 17 encryption and decryption of messages is designed to ensure the confidentiality of information transfer.

The voice activity detector 18 turns on the transmitter for radiation only at those time intervals when the subscriber speaks. During a pause in the operation of the transmitter, the so-called comfort noise is additionally introduced into the path. This is done in the interests of saving energy consumption of the power source, as well as reducing interference levels for other stations.

Terminal devices 19 are used to connect through special adapters using appropriate interfaces, fax machines, modems, etc.

SIM-card (SIM - subscriber identification module, literally - subscriber identification module) - a plastic plate with a microcircuit, inserted into a special slot of the subscriber unit. The SIM card stores:

- data assigned to each subscriber: international mobile subscriber identification number (IMSI), subscriber authentication key (Ki) and access control class;

- temporary network data: temporary mobile subscriber identification number (TMSI), location area identifier (LAI), encryption key (Ke), data on mobile networks prohibited for access;

- data related to the service: the preferred language of communication, notification of payment and a list of declared services.

One of the main tasks of a SIM card is to provide protection against unauthorized use of a cell phone. At the subscriber interface level, a personal identification number (PIN number) from 4 to 8 digits is recorded on the SIM card, which the microprocessor of the SIM card after turning on the station checks against the number dialed by the user using the keypad.

The SIM cards in block 6 can be located in a horizontal or vertical position. Each block 6 can be initially designed to accommodate two, three or a different number of SIM cards. On the front (front) side, box 6 has a shelf or cellular structure, depending on how many SIM cards it is designed for.

On the back (back) side, unit 6 has unified standard contacts for docking with the telephone.

SIM cards, if there are two or more of them, are entered sequentially into the phone’s menu, depending on the order in which they are placed in the unit. At the request of the user, a particular SIM card can be disabled or activated. Such a function is standard and is fixed in one way or another in the phone menu.

Depending on the number of SIM cards, design and production solutions of mobile phone manufacturers, a phone can have several simultaneously working displays 8, one for each SIM card, and one display 8 divided into several sectors - one for each SIM a card, or without any separation at all (of the usual form).

The operation of each of the displays 8 or sectors of the display 8 with the associated SIM card is standard and does not need a separate description.

The operation of the phone is generally similar to the operation of a conventional cell phone with one SIM card, so the aspects of operation due to the presence of several SIM cards will be discussed below.

If several SIM cards of different mobile operators are installed on the phone and signals from them are simultaneously received on the phone, the corresponding sectors are activated on the display at the same time, the corresponding displays are displayed or the message: “conversation 1”, “conversation 2”, etc. .d. with the designation of the respective mobile operator.

The user selects one or another of the calls received simultaneously by pressing the corresponding digital key of the telephone 1, 2, 3, etc. depending on the number of installed SIM cards. If the second call comes at the time of the call, then the second caller in the receiver (at the choice of the user from the menu functions) will hear the usual short beeps indicating the busy line, or he will be sent a sound warning or apology (for example, "please wait one minute" or "call back later"...). Such a sound warning can be any other phrase in the user's voice recorded through the voice recorder of the telephone (such a function can be provided in the menu).

Claims (1)

A cell phone comprising an antenna, a transmitter and receiver, a monitoring and control device with read-only and random access memory, a subscriber identity module, a keyboard, a display, and a power supply unit interconnected via a system bus including a data bus, address bus, and control bus, characterized in that it contains several subscriber identity modules combined in a unit connected to a controller, which, in turn, is connected to a monitoring and control device via a system bus, that each subscriber identification module in accordance with the sequence number corresponding to its installation site key numeric keypad, and each of the subscriber units can be disabled or enabled by the user.