MXPA97004398A - . digital telephone mo - Google Patents

Abstract

A system is disclosed to allow a mobile phone to regain an ongoing communication after a temporary interruption of the operation, for example, as caused by the interruption of power supply to the mobile phone, including the system circuits and processors controls to calculate the duration of the temporary interruption and to restore the synchronization of the mobile phone with the mobile communication system. The circuit stores synchronization information prior to the temporary interruption, and cycles the synchronized circuits of the mobile telephone at a speed higher than the normal speed of the aforementioned, to restore synchronization of the mobile telephone with the mobile communication system. In yet another embodiment, circuits are revealed to restore the output of circuits generating separation codes in a mobile digital broadband telephone or extended spectrum, to a phase used by the transmitting station of a mobile communication system. In another embodiment of the disclosed invention, circuits are disclosed for restoring the output from a time segment generator in a broadband or extended spectrum mobile digital telephone, for synchronization with a time segment pattern used by the transmitting station. of the mobile communication system

Description

MOBILE DIGITAL TELEPHONE Field of the Invention The present invention relates to a mobile telephone, and more specifically to a system and method of mobile telephone that maintains an operation synchronized with a mobile cellular or other communication system. Background of the Invention The demand for terrestrial communications has increased markedly in recent years. In order to meet the growing demand, mobile digital cellular communication systems have been implemented that have an increased channel capacity. Among the many digital mobile communication systems that are available, one that has been widely disseminated uses a set of principles of modulation and transmission known as extended spectrum (broadband) transmission. In the United States of North America has adopted a standard for extended spectrum transmission known by the name of Multiple Access Standard by Code Division ("CDMA Standard"). The CDMA Standard defines a direct separation (widening or extension) system, according to which communication data are modulated by multiplication with a pseudorandom separation code REF: 24643 in the base band (modulation band), then move to a transmission frequency that is shared with other transmitters that transmit in different phases, that is, different entry points, of the same separation or extension code. According to the CDMA Standard, mobile phones demodulate modulated broadband (or broadband) transmissions proceeding in such a way that they multiply the extended spectrum transmission detected with the pseudorandom separation code in the same phase that was used to modulate the signal. The separation code in the communication systems of the CDMA Standard is a sequence of bits that is repeated periodically and that has an approximate length of 32 ilobits. In existing CDMA Standard systems, each base station transmitter is assigned the modulation of outgoing communications so that they are transmitted in one phase, that is, point of entry of a universally used separation code, particular that is distinctive A mobile phone that operates according to Standard CDMA demodulates the transmissions proceeding in a manner that preserves in synchronization the phase of a locally generated separation code with the phase of a separation code used by a base station with which it is in communication. However, existing mobile digital phones, even when they are able to maintain synchronization during normal operation, are subject to communication interruptions when the voltage of the main power source of the mobile phone falls below operating levels. In such cases, even if the voltage of the main power source is quickly restored to return to operational levels, communications that are in progress can not be summarized because the phase of the separation code can not be recovered. the received transmission. In the present specification a mobile telephone system is disclosed which allows the recovery of the communication after a temporary interruption of the operation, as it may be caused due to a (low) failure of the voltage of the main power source of the mobile phone . An existing extended spectrum (broadband) digital mobile telephone will be described, with reference to Figure 1, to illustrate the problem that overcomes the present invention. In Figure 1, antenna 1 is used to receive and transmit signals between the mobile telephone and one or more base stations. The modulation / demodulation circuit 2 is used to demodulate a signal received from a base station and to provide a signal with regenerated data therefrom. The modulation / demodulation circuit 2 is also used to modulate a data signal for transmission to a base station. The 3 time counter of the system is used to acquire and maintain, from the regenerated data signal, a local system time count, to allow the synchronization of the mobile telephone with a universal system time count used by the mobile communication system. The time count of the system is used to regulate certain processes in time, for example, requests to access the system to originate a call through the mobile communication system, and certain operations to transfer a communication that is in the process of being processed. base station to another, when the mobile station moves between transmission zones of the base stations. The time base (or pulse) generator clock 8 of the system is used to provide a time master control signal to operate the system time counter 3 to maintain the locally generated system time count, in synchronization with the system. universal time of the system. The means 10 generating the separation or extension code are used to acquire the initial information for the phase synchronization of separation or extension code, from the regenerated data signal, and to locally generate a separation or extension code in phase synchronization with the phases of separation codes of the received transmissions. The locally generated separation code is sent (as an output signal) to the modulation / demodulation circuit 2, to be used in the modulation and demodulation of transmissions of one or more base stations. The phase clock 11 of the separation code is used to generate a time master control signal to operate the generator means 10 of the separation code. The conventional mobile digital telephone of the prior art also includes an asynchronous timer 4 to independently maintain an absolute time count apart from the universal system time count that is used in the mobile communication system. A supplementary battery 5 energizes the asynchronous timer 4. The microprocessor 6 receives the input commands from (inputted by) the user and generates information for communication control to originate and receive communications. The non-volatile memory 7 stores information, such as the mobile phone identification number, and telephone numbers of subscribers for the purposes of speed dialing telephone numbers.

The operation of the mobile telephone of the conventional prior art will now be described. After energizing the mobile telephone through a switch (not shown) of the main power source, a transmission signal of a base station of the mobile communication system is detected in the antenna 1. The detected transmission signals are demodulated by the modulator / demodulator circuit 2, and are used by the generating means 10 of the separation or extension code to generate a separation code in the same phases as those of the transmission signals. The mobile telephone uses one or more transmit signals from the transmitting base station to establish an initial system time to initialize the system time counter 3. The system time counter 3 is initialized at the same time that the mobile telephone unit acquires a phase of separation code to initialize the generating means 10 of the separation code. By the above-described operations of the conventional mobile telephone of the prior art, it is evident that in order to keep in synchronization the locally generated count of system time, of the system time counter 3, with the universal time of the system, the clock 8 generator The time base of the system must be kept operational and in synchronization with the universal time of the system. In the event that the time base generator clock 8 is temporarily inactive (decomposes), the locally generated time counting and separation code of the system will be out of synchronization and phase with respect to the universal time of the system and the extension code phase used by the transmitting base station. Considering that in the conventional mobile telephone of the prior art there is no recovery mechanism to cope with such an event, any communication that is in progress can not be recovered, even if the energy sufficient to operate the mobile telephone is quickly restored. In the description that will be made following the invention, it is described that the clock 8 generator of time base of the system is temporarily inoperative or "unused", when the voltage of the main power source of the mobile phone falls below the level operative However, the person skilled in the art will understand the applicability of the specific embodiments that are disclosed in the present invention to restore the operation of mobile telephones after other types of malfunctions that temporarily disable the operation of the time meter 3 of the system or the means 10 generators of the separation code.

In accordance with the foregoing, an object of the present invention is to provide a mobile telephone unit that maintains a communication in progress despite an event that causes a system time counter or a separation or expansion code generating means. of the mobile phone unit is temporarily inoperative. Another object of the present invention is to provide a system and method in a mobile telephone to recover, after a temporary interruption of the operation, a system time count and a separation code phase used to synchronize the operations of the mobile telephone with the mobile communication system. SUMMARY OF THE INVENTION The present invention, in a mobile telephone having synchronization means for preserving synchronization with a mobile communication system, is a method and system for restoring synchronization between the mobile telephone and the mobile communication system after a temporary interruption of the operation, characterized in that it comprises; means for calculating the duration of the temporary interruption; and means responsive to the temporary duration of the interruption, to restore synchronization of the synchronization means. In this way, the information about system synchronization can be received again, even when the system stops working due to a voltage drop or an interruption in the power supply of the power source. This and other objects are provided by the mobile telephone and the method according to the present invention. The mobile phone includes non-volatile storage (memory) for storing dynamic information about, the operation of the system, between which is included information about the synchronization of the time counting of the system and the phase of the separation code (existing) just before if there is a failure of the main power source that disables the operation of the mobile phone. Preferably, the non-volatile storage is also used to store static information about the operation of the system, which includes information on the frequency of the control channel and additional information for the operation of the system, such as information on channel assignment. The mobile telephone in accordance with the present invention further includes a time base generator clock (pulse generator) of the high speed (or high frequency) system for rapidly cycling the system time counter based on a calculation on the duration of the failure of the power source, in order to allow the mobile phone to resynchronize with the mobile communication system. A high-speed (or high-frequency) phase clock of the separation or extension code is also provided to rapidly cycle the generating means of the separation code based on the calculated duration of the failure of the main power source. In the present invention, the results are achieved by storing the dynamic information, which includes the counting of the asynchronous timer, the counting of the system timer and the timing information of the separation code phase. The duration of a power failure is calculated by determining the difference between the stored count of the asynchronous timer, and the count of the asynchronous timer at the time the power is restored. The calculated duration of the power failure is used to determine a fast cycle time to quickly cycle the system time counter with a system high-speed time base generator clock after recharging the system time counter with the stored time count of the system. The calculated duration of the power failure is also used to rapidly cycle the generating means of the separation code phase to a separation code phase, after reloading the stored phase synchronization information of the separation code. In this way, after a temporary power failure or other temporary interruption of the operation during a communication that is in progress, the mobile phone quickly recovers the synchronization with the universal time of the system and the separation code phase of the station of transmitting base, in such a way that the communication that is in progress is completely restored without it being necessary to establish the communication again. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram and schematic of the digital mobile telephone of the prior art. Figure 2 is a schematic block diagram of a digital mobile telephone constructed in accordance with the first embodiment of the present invention. Figure 3 illustrates the operations carried out by the mobile digital telephone shown in Figure 2. Figure 4 is a schematic block diagram of a mobile digital telephone constructed in accordance with the second embodiment of the present invention. . Detailed Description of Preferred Forms of Realization. Next, specific examples of the mobile telephone and the method of the present invention will be described, referring to the drawings described in the above. Figure 2 is a schematic block diagram of a mobile telephone constructed according to the first embodiment of the present invention to provide mobile digital communications in accordance with the CDMA Standard adopted for the United States of America. As shown in Figure 2, the reference numerals 1 to 8 and 10 to 11 indicate the same characteristics as those shown and described in relation to the conventional mobile telephone of the prior art of Figure 1. It is not necessary to describe these characteristics here in greater detail. The mobile phone of Figure 2 includes the clock 9 high speed time base generator of the system which is used to generate a high speed time signal (pulses) to operate the system time counter 3 at high speed. The mobile telephone of Figure 2 further includes the high-speed clock of separation code phase, which is used to generate a clock signal to operate at high speed the generating means 10 of the separation code. Next, the operations of the digital mobile telephone of Figure 2 will be described after a paralyzing loss of energy (by failure) of the power source, referring to the flow chart of operations according to Figure 3. As shown in FIG. Figure 3, once the mobile phone begins to operate, in the interval 201, the microporotatory performs a check to determine if the voltage of the main power source is below a predetermined threshold value (range 203). If the voltage of the main power source is not below the threshold, as indicated by the "No" decision arrow, the operation of the mobile phone continues normally, and checks are made again at predetermined intervals after this, both during as well as between ongoing communications, to determine if the voltage of the main power source has fallen below the predetermined threshold value. If the voltage of the main power source has fallen below the predetermined threshold value, the microprocessor 6 stores the current information of the dynamic communication, which includes the current time count of the system 3 time counter, the information phase separation code synchronization current, issued by the separation code generating means 10, and the current absolute time count of the asynchronous timer 4 (interval 205). In the interval 207, the microprocessor 6 stores in the non-volatile memory 7 the current static information of the communication (for example, information of the channel number and of the control channel) that the mobile telephone acquires in operation. The microprocessor 6 also places a current status flag in the range 209, to indicate that the voltage of the main power source has fallen below the threshold. Next, in Figure 3 with reference numeral 211, the occurrence of a failure of the main power source and its subsequent restoration are indicated. After this, in the interval 213, whenever the voltage of the main power source again rises to an operational level, the microprocessor 6 checks to determine if the current status flag for the mobile telephone has been placed. If the current status flag has not been placed, the subtracted microprocessor has been energized to the ignition position from an initial non-ignition position, and begins with the ordinary ignition operations following the ignition, thus summarizing the operation ( interval 215) from the beginning, as in interval 201. However, if after the power has been restored to the mobile telephone the microprocessor determines that the current status flag has been placed (in the range 213), the microprocessor 6 deduces that an abnormal power failure has occurred. Then the microprocessor performs operations to restore the operation of the mobile phone, including restoring any communication that is in progress. In the interval 217 the microprocessor 6 calculates a time duration for switching the operations of the system time counter 3 and the generator means 10 of the extension code phase to the high speed clocks 9 and 12. The microprocessor determines that time duration by determining the difference between the absolute time count of the asynchronous timer 4 stored just before the power failure, and the current absolute time count of the asynchronous timer 4. Using the calculated duration of the power interruption, the microprocessor 6 calculates in the interval 217 the duration of the fast cycling time to rapidly cycle the system time counter 3 and the phase generator means 10 of the extension code by the use of 9 and 12 high-speed clocks. The microprocessor 6 calculates the duration of the fast cycling time according to the relative differences between the speed of the high-speed clocks 9 and 12 and the speeds of the clock 8 base time generator of the system and the clock 11 of the code phase of the clock. separation, respectively. Finally, using the calculated fast cycle time duration, the microprocessor 6 calculates a time count for the restoration for the asynchronous timer 4, which means the time at which the operation of the system time counter 3 and of the means 10 Phase generators of the extension code shall be switched back to the clock 8 normal time base gnerator of the system and to the phase clock 11 of the separation code, respectively. In the interval 219, the stored information of the time counting of the system and the synchronization of the extension code phase are recharged in the system time counter 3 and in the generating means 10 of the separation code, and the microprocessor causes that the clock input signals of the system time counter 3 and of the separation code generator means 10 are switched to the system 9 high-speed time base generator clock and the high-speed code phase clock 11 of separation, respectively.

While the system counter 3 and the separation code generating means 10 have been switched to the high speed or frequency clocks 9 and 12, the microprocessor checks the time count of the asynchronous timer 4 to determine whether the Restoration time count to switch operations back to the clocks used during normal operation (interval 221). If the restoration counting time has not been reached, the microprocessor continues to wait until the moment indicated by the "No" arrow in the interval 221. However, if the calculated time has been reached, the microprocessor causes the inputs of the timer 3 of the system time and of the means 10 phase generators of the separation code are switched back to the clock 8 generator of time base of the system and to the phase clock 11 of the separation code that are used during the normal operation. Then the normal operation of the mobile telephone (interval 225) is resumed, which includes the resumption of the ongoing communication as long as a subscriber at the receiving end distant from the communication has not acted to terminate the communication, or the system communication device has not terminated communication in some other way, for example, reaching the end of the delay interval after the temporary interruption of the communication signal. Figure 4 is a schematic block diagram of a digital mobile telephone constructed in accordance with another embodiment of the present invention, to be used in an extended spectrum or broadband "frequency hopper" transmission system, of the that have been implemented in several European countries. In Figure 4, the time segment generator 13 is used to generate and maintain the current information representing a skip pattern of frequencies, including time segments to transmit at particular or specific frequencies. The time segment clock 14 is used to provide a clock signal input to the generator lS of time segments, so that it generates the current information of time segments. The high-speed clock 15 or frequency of time slices provides a high-speed clock signal to the time slot generator 13 to update the current pattern of frequency jumps and the time slice, after the operation has been restored after an interruption in the power supply or some other temporary interruption of the operation.

In this embodiment of the present invention, similar to the operations of the CDMA digital mobile telephone which was shown and described in the foregoing with reference to Figures 2-3, the current dynamic information, which includes the current information on time segment synchronization that sends the time segment generator 13 in output form, and the absolute time count that the asynchronous timer 4 sends in the form of an output is stored in the volatile memory n when the voltage of the source main power falls below a predetermined threshold level (interval ¡205). When the voltage of the main power source is restored after an abnormal interruption, the microprocessor calculates a rapid duration of cycling time to switch the clock input of the time segment generator 13 to the clock signal provided by the clock 15. high-speed time segments (interval 217). The microprocessor 6 uses the fast duration of cycling time to calculate the time count of the asynchronous timer 4 in which the clock signal input to the time segment generator 13 must be switched back to the time segment clock 14 that is used. during normal operation. In a similar way as the digital mobile phone does in accordance with the first embodiment of the invention, the microprocessor 6 reloads the time segment generator 13 with the information stored on time segment, and switches the clock signal input of the time segment generator 13 to the high speed clock 15 (range 219). The fast cycling continues until the microprocessor determines whether the restoration time count of the asynchronous timer 4 (interval 221) was reached. When the restoration time count has been reached, the microprocessor 6 switches the clock signal input of the time segment generator 13 back to the time segment clock 14 which is used during normal operation (range 223), and the mobile phone resumes normal operations (interval 225). Since the information on time segment, that is, the pattern of frequency jumps, which is required to resume an ongoing communication is restored after the restoration of the mobile phone's power and operations, any communication that currently is restored is restored. is in progress from the mobile phone, as long as the subscriber at the far end has not terminated the communication, or the mobile communication system has not completed the communication in some other way, such as, for example, reaching the end of the delay interval.

Although the invention was described in detail herein according to certain preferred embodiments of the same, many changes and modifications can be made therein by those skilled in the art. Accordingly, the intention of the appended claims is to cover all those modifications and changes that fall within the true spirit and scope of the invention.

Claims (28)

1. CLAIMS 1. In a mobile telephone having synchronization means to keep in synchronization with a mobile communication system, a system to restore synchronization between the mobile telephone and the mobile communication system after a temporary interruption of the operation, which is characterized because it comprises: means for calculating the duration of the temporary interruption; and means responsive to the calculated duration, to restore synchronization of the synchronization means. The system according to claim 1, characterized in that the means for calculating include: means for generating a time count during the temporary interruption; and computing means to acquire and store a time count that begins at the time the temporary interruption arises, to determine a final count of time at the end of the temporary interruption, and to determine the duration from the beginning of the time count to the final count of time. 3. The system according to claim 1, characterized in that the means for restoring the synchronization include means for acquiring and storing synchronization information for the synchronization means, prior to the temporary interruption. The system according to claim 3, characterized in that the synchronization means during normal operation respond to a normal cycling speed, and in that the means for restoring the synchronization include: means for transferring the stored synchronization information to the synchronization means; and means for cycling the synchronization means at a speed higher than the normal cycling speed. 5. The system in accordance with the claim 1, characterized in that the temporary interruption of the operation comprises the interruption of the power supply of the main power source of the mobile telephone. 6. In a broadband or extended spectrum mobile digital telephone having means for generating separation code (or band widening) to locally generate a separation code in a phase used for communication by the transmitting station, and modulation / demodulation means to modulate and demodulate communication signals to and from the transmitting station using the separation code generated locally in that phase, a system for recovering a communication in progress after a temporary interruption of the power supply to the mobile telephone, characterized in that it comprises: means for calculating the duration of the temporary interruption; phase restoring means that respond to the calculated duration, to restore the output of the separation code generating means to the aforementioned phase, such that after this, the modulation / demodulation means modulate and demodulate the communication signals in said phase. The system according to claim 6, characterized in that the mobile telephone further includes a system timer means for maintaining synchronization with a transmission station of the mobile communication system, and in that said system further includes means for restoring the synchronization of the timer means based on the calculated duration. The system according to claim 6, characterized in that the means for calculating include means for generating a time count during the temporary interruption; and computing means to acquire and store a time count that begins at the time the temporary interruption arises, to determine a final count of time at the end of the temporary interruption, and to determine the duration from the beginning of the time count to the final count of time. 9. The system according to claim 6, characterized in that the means generating the separation code during normal operation respond to a normal cycling speed, and because the means to restore the phase also include: means to acquire and store synchronization information for the means generating the separation code, prior to the temporary interruption; means for transferring the stored synchronization information to the generating means of the separation code, after the temporary interruption; and means for cycling the generating means of the separation code at a higher speed than the normal cycling speed, so that the output of the generating means of the separation code is restored to said phase after the temporary interruption. The system according to claim 7, characterized in that the timer means during normal operation responds to a normal cycling speed, and in that the means for restoring the synchronization further include: means for acquiring and storing synchronization information for the timer means of the system, prior to the temporary interruption; means for transferring the stored synchronization information to the system timer means, after the temporary interruption; and means for cycling the timer means of the system at a higher speed than the normal cycling speed, so that the output of the timer means of the system is restored to synchronization with the mobile communication system after the temporary interruption. 11. In a broadband or extended spectrum digital mobile telephone having time slot generating means for locally generating a time slot pattern in synchronization with a time slot pattern of a transmitting station using a transmitting station of a mobile communication system, and modulating / demodulating means for modulating and demodulating communication signals to and from the transmitting station using the locally generated time-segment pattern, a system for recovering a communication in progress after a temporary interruption of the power supply, which is characterized in that it comprises: means for calculating the duration of the temporary interruption; and means responsive to the calculated duration to restore the output of the time-generating means in synchronization with the time-segment pattern of the transmitting station, such that the modulator / demodulator means modulate and demodulate the signaling signals afterwards. communication in synchronization with the time segment pattern of the transmitting station, thus recovering the communication that was in progress. The system according to claim 11, characterized in that the means for calculating include: means for generating a time count during the temporary interruption; and computing means to acquire and store a time count that begins at the time the temporary interruption arises, to determine a final count of time at the end of the temporary interruption, and to determine the duration from the beginning of the time count to the final count of time. 13. The system according to claim 11, characterized in that the time-generating means, during normal operation, respond to a normal cycling speed, and because the means for restoring include: means for acquiring and storing synchronization information for the means generating time segment, prior to the temporary interruption; means for transferring the stored synchronization information to the time-generating generating means after the temporary interruption; and means for cycling the time-generating means at a rate higher than the normal cycling speed, such that synchronization of the output of the time-generating means with the mobile communication system is restored after the temporary interruption. 14. In a mobile telephone having synchronization means for keeping in synchronization with a mobile communication system, a method for restoring synchronization between the mobile telephone and the mobile communication system after a temporary interruption of the operation, which is characterized because it includes the steps of: calculating the duration of the temporary interruption; and restoring synchronization of the synchronization means based on the calculated duration. 15. The method according to claim 14, characterized in that the calculation step includes: generating a time count during the temporary interruption; detect a principle of temporary interruption; acquire and store an initial time count at the time of the occurrence of the interruption; determine a final time count at the end of the temporary interruption; and determine the duration between the initial count of time and the final count of time. The method according to claim 14, characterized in that the step of restoring synchronization includes acquiring and storing synchronization information for the synchronization means, prior to the temporary interruption. The system according to claim 16, characterized in that the synchronization means during normal operation responds to a normal cycling speed, and in that the step of restoring the synchronization further includes: transferring the stored synchronization information to the medium of synchronization; and cycling the synchronization means at a speed higher than the normal cycling speed. The system according to claim 14, characterized in that the temporary interruption of the operation comprises the interruption of the power supply of a main power source of the mobile telephone. 19. In a broadband or extended spectrum mobile digital telephone having means for generating separation code (or band widening) to locally generate a separation code in a phase used for communication by the transmitting station, and modulation means / demodulation to modulate and demodulate communication signals to and from the transmitting station using the separation code generated locally in that phase, a system for recovering a communication in progress after a temporary interruption of the power supply to the mobile telephone, which is characterized in that it includes the stages of: calculating the duration of the temporary interruption; restoring the output of the generating means of the separation code to the aforementioned phase based on the calculated duration, in such a way that the modulation / demodulation means subsequently modulate and demodulate the communication signals in said phase. The method according to claim 19, characterized in that the mobile telephone further includes system timer means for maintaining synchronization with a transmitting station of the mobile communication system, and in that the method further includes the step of restoring synchronization of the half timer of the system based on the calculated duration. The method according to claim 19, characterized in that the calculation step includes: generating a time count during the temporary interruption; detect a principle of temporary interruption, - acquire and store an initial time count at the time of the occurrence of the interruption, - determine a final count of time at the end of the temporary interruption; and determine the duration between the initial count of time and the final count of time. 22. The method in accordance with the claim 19, characterized in that the means generating the separation code, during normal operation, respond to a normal speed of cycling, and because the means to restore the output include: acquiring and storing synchronization information for the generating means of the code. separation, prior to the temporary interruption; transferring the stored synchronization information to the generating means of the separation code after the temporary interruption; and cycling the generating means of the separation code at a speed higher than the normal cycling speed, such that the output of the generating means of the separation code is restored to the aforementioned phase after the temporary interruption. 23. The method according to the claim 20, characterized in that the timer means of the system, during normal operation, responds to a normal cycling speed, and because the step of restoring synchronization includes: acquiring and storing synchronization information for the system timer means prior to the temporary interruption; transfer the stored synchronization information to the system timer means after the temporary interruption; and cycling the system timer means at a rate higher than the normal cycling speed, such that the synchronization of the system timer means with the mobile communication system after the temporary interruption is restored. 24. In a broadband digital or extended spectrum mobile telephone having time slot generating means for locally generating a time slot pattern in synchronization with a time slot pattern of a transmitting station using a transmitting station of a mobile communication system, and modulating / demodulating means for modulating and demodulating communication signals to and from the transmitting station. using the generated time segment pattern Ideally, a method for recovering a communication in progress after a temporary interruption of the power supply, characterized in that it comprises the steps of: calculating the duration of the temporary interruption; and restoring the output of the time segment generating means in synchronization with the pattern of 4 time segment of the transmitting station based on the calculated duration, in such a way that the modulation / demodulation means subsequently modulate and demodulate the communication signals in synchronization with the time segment pattern of the transmitting station, thus recovering the communication in progress. 25. The method according to claim 24, characterized in that the calculation step includes: generating a time count during the temporary interruption; detect a principle of temporary interruption; acquire and store an initial time count at the time of the occurrence of the interruption; determine a final time count at the end of the temporary interruption; and determine the duration between the initial count of time and the final count of time. 26. The method according to claim 24, characterized in that the means generating the time segment, during normal operation, respond to a normal cycling speed, and because the means to restore the output include: acquiring and storing information of synchronization for the time-generating generating means, prior to the temporary interruption; transferring the stored synchronization information to the time-generating generating means after the temporary interruption; and cycling the time-segment generating means at a rate higher than the normal cycling speed, such that the output of the time-segment generating means is restored to synchronization with the mobile communication system after the temporary interruption. . 27. In a mobile telephone having synchronization means for keeping in synchronization with a mobile communication system, a system for restoring synchronization between the mobile telephone and the mobile communication system after a temporary interruption of the operation, which is characterized because it includes: means to calculate the duration of the temporary interruption; and means responsive to the calculated duration, to restore synchronization of the synchronization means; wherein the means for calculating comprises non-volatile memory means for storing information related to the calculated duration of the interruption. 28. The system according to claim 27, characterized in that a power source that feeds the system comprises: a first source of power to activate the calculation means, - and a second power source to activate the other sources of power. power. SUMMARY A system is disclosed to allow a mobile phone to recover a communication in progress after a temporary interruption of the operation, for example, as they are caused by the interruption of power supply to the mobile phone, including the system circuits and controls processors to calculate the duration of the temporary interruption and to restore the synchronization of the mobile telephone with the mobile communication system. The circuit stores synchronization information prior to the temporary interruption, and cycles the synchronizing circuits of the mobile telephone at a speed higher than the normal speed of cuckolding, to restore the synchronization of the mobile telephone with the mobile communication system. In yet another embodiment, circuits are revealed to restore the output of circuits generating separation codes in a mobile digital broadband telephone or extended spectrum, to a phase used by the transmitting station of a mobile communication system. In another embodiment of the disclosed invention, circuits are disclosed for restoring the output of a time segment generator in a broadband or extended spectrum mobile digital telephone, for synchronization with a time segment pattern used by the transmitting station. of the mobile communication system.