The method of locating a mobile terminal in a cellular telecommunications system and the locator of the mobile terminal

 

(57) Abstract:

The locator for the mobile terminal detecting the location of a mobile terminal in a cellular telecommunications system identifies a number of hundred candidates for the transfer with sufficient signal strength to maintain a call, force causes serial transmission of the mobile terminal from the serving his cell to several hundred candidates for transfer, then the locator measures the magnitude of the signal and delay spread between the mobile terminal and base stations. Then either the signal or the delay in the distribution, or both are used to calculate the distance between the mobile terminal and each base station associated with each of several hundred candidates for transmission, and between the mobile terminal and the service of its base station, then from the calculated distances is determined by the number of arcs, the possible locations of the mobile terminal locator of the mobile terminal calculates the intersection of a number of arcs a possible location, identifying the location of the mobile terminal. The locator can operate in cellular telecommunication systems synchronized with the reference signal

THE TECHNICAL SCOPE OF THE INVENTION

The present invention relates to cellular telecommunications systems and more specifically to a system and method for detecting the location of a mobile terminal operating within the service area of the cellular telecommunication system.

DESCRIPTION OF RELATED TECHNICAL DEVELOPMENTS

In modern mobile telecommunication systems, the service area is divided into cells, each of which is served by one base station. When a mobile terminal moves in the service area of the system, they are passed from one cell to another, so that the service is not interrupted. In times of critical situations, the location information would be useful for emergency police or emergency crews respond to the situation.

The main difficulty in the existing solutions for the problem of detecting the mobile terminal is in the high cost and complexity associated with their implementation in the existing infrastructure of cellular networks. Some solutions require extensive modifications of base stations or other components of the cellular telecommunication system. Others require extensive modifications of the mobile terminal and inadequate due to a known existing solutions to the aforementioned difficulties and disadvantages, such opened here the solution, there are a number of known from the prior art sources discussing this subject and which have some relation to the problems that will be discussed here. Such sources of information are the U.S. patents NN 5.293.645 issued by the Court; 5.293.642 issued by the lo; and 5.208.756 issued to the Song. Each of these sources is briefly discussed below.

In U.S. patent N 5.293.645 issued by the Court, the disclosed system and method for detecting mobile radioterminal within the cellular telephone network. The court requires that the number of base stations transmitted synchronized reference clock signal. The receiver in the network takes the transmission to be detected radioterminal, which includes the information compiled in the radio terminal and indicating the relative delays in the dissemination of when receiving a reference clock signal from at least three base stations. The processor associated with the receiver, processes the transmission to convert the delay spread in the geographic location of radioterminal.

There are several disadvantages of the method detection unveiled by the Court. First, the existing network must be modificirovannaya. Secondly, the mobile radio terminals must be modified to compile information indicating the relative delays in the dissemination of when receiving a reference clock signal from at least three base stations. Thirdly, the mobile terminal needs to be modified, so they passed this compiled information. Fourth, the receiver must be modified or added to the network to receive transmissions from the mobile terminal indicating the relative delay spread. Fifthly, in the network need to add a processor to convert the delay spread in the geographic location of radioterminal. Ultimately, the Court provides a very expensive and complicated from the point of view of logic, the way to detect a mobile terminal.

In U.S. patent N 5.293.642 issued lo, disclosed a method of estimating the location of a mobile station in the cellular system. The mobile station measures the parameters of the propagation of radio waves between the mobile station and each base station within range of the signal of the mobile station. Measured parameters may include the magnitude of the signal and the delay in the propagation of radio waves and ispolzuya attenuation (weakening) of the radio channel. These parameters are then used to determine the probability density function determine for each individual base station. Then we construct the joint density function of probability by combining the separate functions of each base station. Then the joint density function of the probability is used for the statistical evaluation of the likely location of the mobile station.

As the Court decision, revealed in the law, has a number of drawbacks. First, the cellular network and the mobile station needs to be modified to detect and expected different parameters of radio-wave propagation for each base station. Lo does not disclose how to determine parameters such as the attenuation of the radio channel, but only asserts that need to be defined through the methods of measurement of radio signal using the test transmitter mounted on the vehicle, or through theoretical propagation models, or a combination of both methods. It would be very expensive and time consuming operation to determine such parameters of radio-wave propagation for the coverage area of each base station in sistemam the calculation of the density functions of probability. Thirdly, in the communication system need to include additional processors to implement these functions. Thus, the law also provides for a very expensive and complicated from the point of view of logic, the way to detect a mobile terminal.

In U.S. patent N 5.208.756 issued to the Song, the disclosed detection system and vehicle navigation using a cellular telephone network. The song of the mobile phone device measures the relative values of control signals received from multiple base stations. Then this device calculates the distance between the vehicle and each base station as a function of transmitted power, received power and the factors weakening signals for signals transmitted by each base station. The device then uses trilateralization or arcularius to determine the location of the vehicle as a function of the calculated distances and the known locations of base stations.

The way the song has the disadvantages that its implementation in existing mobile phones need to make significant modifications. First, you need to add a memory device for storing information about every which way you want to define such data, as factors of attenuation for each base station and the location in the coverage area, the song also does not disclose how to store in the mobile phone device such large amounts of data. Second, this information must be updated when adding additional base stations, when the power change transmitter or changing any other factors attenuation. Thirdly, you need to add a processor for calculating the distance of each base station and for holding trilateralization or Arculli required to determine the geographical location of the mobile phone. Thus, the song also provides a very expensive and complicated from the point of view of logic, the way to detect a mobile terminal.

An overview of each of the above sources do not detect any disclosure or hint system or method, such as described and claimed here.

It would be a distinct advantage to have a system and method for detecting the location of a mobile terminal in a cellular telecommunications system that would not require that the base station transmitted synchronized reference clock signal and would not require extensive modifications of the buy provides for such system and method.

SUMMARY OF INVENTION

In one aspect of the present invention is a locator of the mobile terminal to detect a mobile terminal in a cellular telecommunications system having a number of base stations and associated sites, and the mobile terminal is served by one of a number of base stations. The locator of the mobile terminal includes a tool for the identification of several hundred candidates for transmission having sufficient signal strength to support the call in the mobile terminal. There is also a means of internally displaced serial transmission of the mobile terminal from its serving cell to several hundred candidates for transmission having sufficient signal strength to support the call. In addition, there is a means for measuring the signal magnitude and delay in the spread between the mobile terminal and each base station associated with each of several hundred candidates for transmission, and between the mobile terminal and the serving base station. The locator of the mobile terminal also includes a tool to calculate the distance between the mobile terminal and each base station associated with each of several hundred candidates for transfer between mobile and Polozhenii mobile terminal, and arc centered on serving base station and each base station associated with each of several hundred candidates for transfer. Finally, there is a means for calculating determine the point of intersection of a number of arcs of possible locations, and the intersection point determines the location of the mobile terminal. The locator of the mobile terminal can operate in cellular telecommunication systems in the presence or in the absence of synchronized reference synchronization signals from base stations.

In another aspect of the present invention is a method of locating a mobile terminal in a cellular telecommunications system having a number of base stations and associated sites, and the mobile terminal is served by one of a number of base stations. The method begins with the identification of several hundred candidates for the transfer with sufficient signal strength to support the call in the mobile terminal, and forced the serial transmission of the mobile terminal from the serving his cell to several hundred candidates for the transfer with sufficient signal strength to support the call. Then the method includes measuring signal strength and delay spread of maidu mobile terminal and a serving base station. Then either the signal or the delay in the distribution, or both are used to calculate the distance between the mobile terminal and each base station associated with each of several hundred candidates for transmission between the mobile terminal and the service of its base station. Then, from the calculated distances is determined by the number of arcs of the possible locations of the mobile terminal, and an arc centered on serving base station and each base station associated with each of several hundred candidates for transfer. Finally, the method includes the calculation of the intersection point of a number of arcs of possible locations, and the intersection point determines the location of the mobile terminal.

BRIEF DESCRIPTION OF DRAWINGS

The present invention will be better understood and its numerous objectives and advantages will become more apparent to specialists when referencing the following drawings in conjunction with the accompanying description, where:

Fig.1 (prior art) is a block diagram showing the system components of cellular communication associated tendered invention;

Fig.2 is an illustrative diagram showing the search map, designed WTO block diagram, showing functions performed by the system of the present invention, upon detection of the mobile terminal.

DETAILED DESCRIPTION OF EXAMPLES OF CARRYING OUT THE INVENTION

As first seen in Fig.1, there is shown a conventional system 10 of the cellular radio of the type which can mainly include the invention. In Fig.1 arbitrary geographic area may be divided into a number of continuous areas radiokate hundred or C1-C10. Although the system of Fig.1 for illustration includes only 10 sites, it should be clearly understood that in practice a number of hundred will be much more.

The base station is specified as the corresponding station number of the base stations B1 - B10, associated with each of the hundreds of C1-C10 and is located within it. Each of the base stations B1-B10 contains the transmitter, receiver and control unit (controller) base station, as is well known in the art. In Fig.1 the location of the base stations B1-B10 is selected in the center of each of the hundreds of C1-C10, respectively, and they are equipped with omnidirectional antennas. However, in other configurations of the cellular radio system base stations B1-B10 may be located about the periphery or otherwise away from the center of hundreds of C1-C10 and can irradiate the cells C1-C10 Radiotehnika for illustration and does not limit possible implementations of a mobile radio system, in the framework of which can be implemented locator mobile terminal system of the present invention.

Upon further examination of Fig.1 can discover a number of mobile terminals M1-M10 inside hundreds of C1-C10. Again, only ten of the mobile terminal shown in Fig. 1, but you have to understand that the actual number of mobile terminals will be much greater, and in practice will always be far greater than the number of base stations. Moreover, the mobile terminal M1-M10 shown in some of the hundreds of C1-C10. The presence or absence of mobile terminals in a particular cell of C1 - C10, as should be understood, depends in practice on the individual desires of subscribers using mobile terminals M1-M10. Subscribers can randomly move from one location in a cell to another, or from one cell to an adjacent cell or neighboring cell, and even from one cellular communication system, serviced by a mobile switching center (MSC) 11, in another such system, all the while taking or sending calls within a cellular system 10, and to the public switched telecommunications network public (PSTN), which is connected to the MSC 11.

Each of the mobile terminals M1-M10 are able to initiate Il for voice or communications. MSC 11 is connected by communication channels 13 (for example, cables) with each of the illustrated base stations B1-B10 and the PSTN 12 or a similar fixed network which may include digital network integrated services (ISDN) (not shown). Appropriate connections between the MSC 11 and the base stations B1-B10 or between 11 MSC and PSTN 12 is not fully shown in Fig. 1, but is well known to specialists. Similarly it is also known that in a cellular radio system included more than one mobile switching center (MSC) and each MSC is connected with a different group of base stations and with other MSC by cable or radio.

Each of the hundred C1-C10 assigned a series of voice or speech channels and at least one channel access or control, such as managing the direct communication channel (FOCC). The control channel is used to control or supervise the work of the mobile terminal by means of information transmitted or received from these devices, called messages. Managers and administrative messages within a cellular radio system are sent in compliance with the set industry standards air interface, such as AMPS, IA/TIA 553, standards for the standards govern the operations in North America, similar standards govern other geographic regions around the world and is well known to specialists.

Information exchanged between base stations and mobile terminals through messages, may include incoming call signals, outgoing call signals, signal search call (paging), response signals to the search, call signal reception location, voice, distribution channels, operating instructions and instructions for transmitting, when the mobile terminal leave from the zone of radiokate one cell and entering the area radiokate other sites, as well as additional items of information, such as the number of the caller, the time information, etc., Control or voice channels can operate in analog or digital mode or combination of components based on industry standards. Integrated services between different cellular telecommunication system feature using intersystem specifications is-41.

Fig.2 is an illustrative diagram showing a search card 20, made in accordance with the provisions of the preferred example implementation of the present invention. In illustratae 24 multiple access with a temporary seal (MTLD) digital channel traffic. Although only three base stations are used in the illustrative example of Fig.2, it should be understood that in practice it is possible to use more. The present invention provides a forced handover from the serving base station 21 to eligible satam 22 and 23 for transmitting, by measuring the amount of signal delay in the distribution, or both from the serving base station and the base station of each cell to transmit the calculated distance of the mobile terminal 24 from each base station. Then, from the calculated distances are displayed arc of possible locations of the mobile terminal. Then to calculate the location of the mobile terminal 24 are well known methods of geographical intersection, such as triangulation, arkusze, density functions, probability, etc.

Fig. 3A-3C is a block diagram showing the functions performed by the system of the present invention, upon detection of the mobile terminal 24. Starting with Fig. 3A, in step 41 starts operation of the locator of the mobile terminal. This process can be initiated either by the mobile subscriber requesting service locator, or at the request of other parties such as the police, the sludge is if the mobile subscriber has a car accident and unable to call for help due to injuries. If it is requested by others, the process may be carried out as much as the time the mobile terminal is switched on and able to respond to search the call request and is assigned a voice channel. Upon receipt of the response to the search call is assigned a voice channel. You can then send an alarm signal to the mobile terminal 24, but it is not necessary to send that there was a process of discovery. Can be, for example, scenarios where the police will want to locate a mobile terminal, not disturbing the subscriber, and this invention provides such an opportunity.

In step 42, the counter of the search is set to zero (0). In step 43, the system measures the magnitude of the signal and the delay in the spread between the mobile terminal and the service of its base station, and stores this information in the data file for further processing. The magnitude of the signal measured by the mobile terminal, and in accordance with industry standards, the delay spread is measured by the base station. The process then proceeds to step 44 and the measurement of the signal between the mobile terminal and each hundredth in the search list. In the beginning of the search list may be a list of neighbors to eliesabeth extended list of neighbors or a subset of the list of neighbors. The magnitude of the signal can be measured either at the base station or mobile terminal (i.e., on a suitable channel or off-channel). In the preferred exemplary embodiment, the signal value is measured in the mobile terminal.

The process then proceeds to step 45 and identifies the first cell in the search list. At step 46 determines whether the signal value from the first cell in order to maintain the call. If the magnitude of the signal is insufficient, the process proceeds to step 48. If, however, the magnitude of the signal is sufficient, the process proceeds to step 47, where the honeycomb eligible for ranking in the list of candidates for transfer.

Then the process continues to Fig.3B, step 48, where it is determined whether the measured honeycomb last hundredth in the search list. If it is determined that the cell is not the last hundredth in the search list, the process proceeds to step 49, where identified, the next cell in the search list. The process then returns to step 46 (Fig.3A), and repeats steps 46-49 for each cell in the search list. If at step 48 it is determined that the measured cell is the last cell in the search list, the process proceeds to step 51, where it is determined whether there are any cells competent DL is t with sufficient signal strength to maintain a call), the location of the mobile terminal can be determined only within the serving cell. Thus, the process proceeds to step 52, where the calculated distance from the mobile terminal to the serving base station. The distance can be calculated based only on the magnitude of the signal based on the delay in the distribution or on the basis of their combination. The result of this calculation is the arc with the center at the base station. If the base station uses an omnidirectional antenna, the arc forms a circle of possible locations around the base station. If the base station uses an antenna with directional sector, the arc limited angular sector.

However, if at step 51 is determined that there is a honeycomb eligible for ranking in the list of candidates for transmission, the process proceeds to step 53, where the competent cells are ranked in priority order with the formation of a prioritized list of candidates for transfer. The priority can be determined according to the decreasing signal value or according to any other suitable criteria, such as the probability of error in bits, voice quality, noise level, the ratio of carrier to interference (n/a), etc., In the regions where you use the preference can be used as a criterion for priority ranking. The process then proceeds to step 54, where identified the first cell to transmit the list of candidates.

The process then verifies that the mobile terminal is identified SOTE-the candidate, in step 55 by measuring the magnitude of the signal at the base station cell candidate. The process then passes to step 56, where it is determined whether the measured signal to maintain the call and that the corresponding digital color code validation (verification) (DVCC) correctly identifies the mobile terminal. If the signal value is insufficient or DVCC is incorrect, the process proceeds to step 57, where the honeycomb candidate is taken out of the list of candidates for transfer. Then the process continues to Fig.3C, step 58, where it is determined whether there is another cell candidates in the list of candidates for transfer. If in the list there are no more cells, the process goes forward to step 66. However, if in the list there is an additional cell, the process proceeds to step 59 and identifies the next cell in the list of candidates for transfer. The process then returns to step 55 (Fig.3B), checks the presence of the mobile terminal in the next cell and continues, as shown in Fig.3V.

If at step 56, it was determined that ve is Verka (DVCC) correctly identifies the mobile terminal, the process continues to Fig.3C, step 61, where the process forces the transmission of the mobile terminal to the identified cell candidate. Then, in the process measured value signal and the delay in the spread between the mobile terminal and the base station cell for transmission in step 62 and stored this information in the data file in the MSC 11 for further processing. The process then proceeds to step 63, and determines whether the search counter two (2). If the search counter is not equal to 2, the process proceeds to step 64 and provides an increment to the search counter. The process then identifies the next cell in the list of candidates for transmission at step 65. After this, the process returns to step 55 (Fig.3B) and continues the process for each cell candidate until it is determined in step 63 that the search counter is equal to two (2).

When the search counter is equal to two (2), the process proceeds to step 66, where the mobile terminal is transmitted primary serving cell. The process then proceeds to step 67, where the distances are calculated between the mobile terminal and the initial serving base station and each of the hundreds of candidates who have sufficient signal value and the correct DVCC. The processing device (CPU) in the MSC 11 Russkaya and delay in the distribution, stored in the data file MSC. The distance calculations can be performed based on only the magnitude of the signal, only the delay in the distribution or on the basis of their combination. 68 the processor 11 MSC uses the distance calculations to obtain a set of additional arcs centered on serving base station, and additional arcs centered at the base stations of each of the measured database of candidates. These arcs represent the possible location of the mobile terminal. In step 69, the processor in MSC calculates the point of intersection of the set of arcs, using well-known methods of geographical intersections, such as triangulation, arcularius, functions, probability densities, etc., the Point of intersection is the location of the mobile terminal. The process then ends at step 71.

Optional this invention may involve the inclusion of graphic cell display, which can be shown position in latitude and longitude of base stations 21-23 used in the search. Arc location 26, 29 and 30 can also be displayed, as well as the intersection point 31 that represents the position of the mobile terminal 24.

If the mobile terminal 24 is located near the verge of the et to include cells in the neighboring MSC. In this case you use the standard methods of communicating with the exchange between centres. Transfer satam in other exchanges are identified as transmission locator mobile terminal. This informs the neighboring MSC that the mobile terminal should be passed back initiating MSC 11 after measuring the amount of signal and delay spread. Neighboring MSC also sends the measured value signal and the delay spread in initiating MSC 11 for use in its calculations of the location.

It is believed that the operation and construction according to this invention will be apparent from the above description. Although shown and described a method, device and system was characterized as preferable, it is obvious that they can conduct various changes and modifications, without departing from the meaning and scope of the invention as defined in the claims.

1. The method of detecting the location of the mobile terminal unsynchronized cellular telecommunication system having a number of unsynchronized base stations and related sites, and a mobile terminal served by one Rada of base stations, characterized in that it includes the IDA the mobile terminal, forced serial transmission of the specified mobile terminal from the serving cell to the specified number of hundred candidates for the transfer with sufficient signal strength to maintain a call, the change in signal magnitude and delay in signal propagation between the mobile terminal and each unsynchronized base station associated with each of the specified number of hundred candidates for transmission, and between the mobile terminal and a serving base station, determining a distance between the mobile terminal and each unsynchronized base station associated with each of the specified number of hundred candidates for transmission, and between the mobile terminal and a serving base station, determination of the number of arcs of the possible locations of the mobile terminal, one of which centered on serving base station and one additional arc centered on each unsynchronized base station associated with each of the specified number of hundred candidates for the transmission, and determining the point of intersection of the specified number of arcs of possible locations for determining the location of a mobile terminal.

2. The method according to p. 1, characterized in that the identification of a number of honeycomb-ka which includes identification of the initial search list, contains the list of neighbors of the serving cell.

3. The method according to p. 2, characterized in that the identification of several hundred candidates for the transfer with sufficient signal strength to maintain a call in the mobile terminal, includes the change in the value of the signal between the mobile terminal and each unsynchronized base station associated with each of the cells in the list of neighbors of the serving cell, and a list of measured cells having sufficient signal strength to maintain a call in the mobile terminal.

4. The method according to p. 3, characterized in that it further includes establishing priorities hundred in the list of hundred candidates for transfer.

5. The method according to p. 1, wherein determining a distance between the mobile terminal and each unsynchronized base station associated with each of the specified number of hundred candidates for transmission, and between the mobile terminal and the serving base station includes determining distances using the measured delay spread.

6. The method according to p. 1, wherein determining a distance between the mobile terminal and each unsynchronized the scrap and the serving base station includes determining distances using the measured signal.

7. The method according to p. 1, wherein determining a distance between the mobile terminal and each unsynchronized base station associated with each of several hundred candidates for transmission, and between the mobile terminal and the serving base station includes determining distances using a combination of measured delay distribution and the measured signal.

8. The method according to p. 1, characterized in that the determination of the point of intersection of a number of arcs possible locations include the use of methods of geographical intersection selected from the group consisting of Arculli, triangulation and determine the density function of probability.

9. The locator of the mobile terminal to service the location of the mobile terminal in the synchronized cellular telecommunication system having a number of unsynchronized base stations and related sites, and a mobile terminal served by one of a number of base stations, characterized in that it contains a tool for the identification of several hundred candidates for the transfer with sufficient signal strength to maintain a call in a mobile terminal, a means for implementing the at several hundred candidates for transfer, having sufficient signal strength to maintain a call, means for measuring the magnitude of the signal and the delay in its distribution between the mobile terminal and each unsynchronized base station associated with each of several hundred candidates for transmission, and between the mobile terminal and a serving base station, means for measuring the distance between the mobile terminal and each unsynchronized base station associated with each of several hundred candidates for transmission, and between the mobile terminal and a serving base station, means for determining the number of arcs of the possible locations of the mobile terminal, one of these arcs centered on serving base station and one additional arc centered on each unsynchronized base station associated with each of several hundred candidates for transmission, and means for determining the point of intersection of a number of arcs of possible locations for defining the position of the mobile terminal.

10. The locator under item 9, characterized in that the means for the identification of several hundred candidates for the transfer with sufficient signal strength to maintain a call in a mobile terminal includes cf="ptx2">

11. The locator under item 10, characterized in that the means for the identification of several hundred candidates for the transfer with sufficient signal strength to maintain a call in a mobile terminal includes a means for measuring the magnitude of the signal between the mobile terminal and each unsynchronized base station associated with each of the cells in the list of neighbors of the serving cell, and means for drawing up the list of measured cells having sufficient signal strength to maintain a call in the mobile terminal.

12. The locator on p. 11, characterized in that it further comprises means for setting priorities hundred in the list of hundred candidates for transfer.

13. The locator under item 9, characterized in that the means for determining the distance between the mobile terminal and each unsynchronized base station associated with each of several hundred candidates for transmission, and between the mobile terminal and the serving base station includes means for determining the distance using the measured delays in the distribution.

14. The locator under item 9, characterized in that the means for determining the distance between the mobile terminal and each of desynhronization logimouse base station includes means for determining the distance using the measured signal.

15. The locator under item 9, characterized in that the means for determining the distance between the mobile terminal and each unsynchronized base station associated with each of several hundred candidates for transmission, and between the mobile terminal and the service station includes a means for determining distances using a combination of measured delay distribution and the measured signal.

16. The locator under item 9, characterized in that the means for determining the point of intersection of a number of arcs possible locations use the geographical intersection selected from the group consisting of Arculli, triangulation and determine the density function of probability.

17. The locator under item 9, characterized in that the means for measuring the magnitude of the signal and the delay in the spread between the mobile terminal and each unsynchronized base station associated with each of several hundred candidates for transmission, and between the mobile terminal and the serving base station includes a means for measuring the magnitude of the signal and delay spread without synchronization of base stations for transmitting synchronized chronologic reference signals synchronize

 

Same patents:

The invention relates to wireless communications systems, in particular to an improved method for sending control signals between the base station and mobile station in a cellular telephone network

The invention relates to cellular communication systems, containing many base stations

The invention relates to a communication system and provides the highest quality and service users on average in all multi-user communication system by controlling the transmission rate user multi-user communication systems

The invention relates to communication systems and can be used to predict the movement of mobile terminals

The invention relates to the transmission of the calling mobile stations within a cellular radio communication systems and, more specifically, to the transmission of the call within the layered cell structures such systems

The invention relates to transmission systems call for mobile stations of the cellular radio system

The invention relates to wireless communications systems, in particular to an improved method for sending control signals between the base station and mobile station in a cellular telephone network

The invention relates to cellular communication systems, containing many base stations

The invention relates to wireless communication systems, and more specifically to a method and apparatus for message transmission over the channel with digital control in cellular radio system

The invention relates to mobile (mobile) radio receiving apparatus for a cellular radio telecommunication system according to the restrictive part of paragraph 1 of the claims

The invention relates to a telecommunication system GSM-type device having a higher level or the internal register position (HLR), which includes the software needed for basic functions and the corresponding additional service functions

The invention relates to a system workload management for cellular mobile networks

Adapter cell phone // 2146852
The invention relates to an adapter cell phone intended for a compatible connection between the cellular phone and the external device cell phone

The invention relates to the field of navigation, and more specifically to receivers of signals from satellite navigation systems (SNS) GPS and GLONASS frequency band L1
Up!