Method and device for controlling transmission power in a cellular system mobile radio communications multiple access code division multiplexing

 

(57) Abstract:

System power control in cellular mobile radiotelephone communication system, the subscribers which exchange messages with each other at least one mobile station using the communication signals multiple access spread spectrum and code division multiplexing. The system manages the power of the transmission signals from each cell of the rolling apparatus (16, 18) in a cellular system mobile radio communications, in which each cellular mobile radiotelephone (16, 18) has an antenna, transmitter and receiver, and each mobile station (12, 14) also has an antenna, transmitter and receiver. The power of signals transmitted by mobile station measured at the mobile subscriber. The power of the transmitter mobile subscriber regulate in inverse proportion to changes in power of received signals. Can also be used diagram of the power control feedback. In the mobile station, which has established communication with a mobile subscriber, measure the transmit power mobile subscriber. In the mobile station generates the command signal and transmit the mobile subscriber to further adjust the power of its plumage is alzueta for further adjust the transmitter power mobile subscriber, the corresponding deviations of the power of signals received by mobile stations. The feedback scheme is used to adjust the transmitter power mobile user so that the transmitted mobile subscriber signals in the mobile station, have the required power level. In the case of multiple cell areas, the transmit power of mobile subscribers regulate in such a way as to prevent unwanted races of the power level of the transmitter mobile subscriber. 6 C. and 20 C.p. f-crystals, 7 Il.

This invention relates to communications systems. In particular, the present invention relates to a new and improved method and device for control of transmit power in a cellular system mobile radio communications multiple access code division of channels.

Multiple access, code-division multiplexing is one of the modulation techniques to facilitate the transfer of messages between a large number of system subscribers. Although other known methods, for example, multiple access with time division multiplexing, multiple access frequency division channels and methods amplitude modem channels has significant advantages over the previous methods. The application of the method of multiple access code division of channels in the communication system described in U.S. patent N 4901307, which is described in the present description by reference.

In the mentioned patent describes a method of multiple access that many subscribers of mobile radiotelephone communication system, each of which contains a transceiver, communicate through satellite repeaters or terrestrial Central station (also known as mobile station) using a broadband signal multiple access code division of channels. In systems multiple access code division multiplexing frequency spectrum may be used multiple times, which allows to increase the number of subscribers of the system.

When using multiple access systems with code division of channels relative spectral efficiency is much higher than that which can be achieved using other multiple access methods. In the system multiple access code division of channels increase capacity (i.e. number of subscribers) of the system can be implemented by the power control perday. When using the method of multiple access code division of channels in a satellite communication transceiver mobile subscriber measures the power level of the signal received from the satellite repeater. Using the measured value of power and knowing the power level of the satellite relay link satellite - Earth and the sensitivity of the receiver mobile subscriber transceiver mobile subscriber can estimate the losses on the road in the transmission channel between it and the satellite. Next, the transceiver mobile subscriber determines the appropriate transmit power required for transmitting signals between a mobile subscriber and a satellite repeater based on the measured path loss, data transfer rate and sensitivity of the receiver to the satellite repeater.

Signals transmitted by a mobile subscriber to a satellite repeater, relayed the latest on the Central ground station control system. The ground station measures the received power of the signals transmitted by each transmitter are currently active mobile subscriber. Then the ground station determines the deviation of the received power from uravneniy the power level which is supported by high-quality communication, resulting the reduction of interference in the system.

Next, the ground station transmits control commands power in each of the mobile subscribers to adjust or, in other words, the exact configuration of the power transmission mobile subscriber. This command is used in a mobile subscriber to change the power level to the minimum level necessary to ensure the required communication. If you change the state of the channel (usually due to the movement of mobile subscriber), by measuring the power receiver mobile subscriber and feedback for power control from the ground station provides continuous regulation of the power level to maintain the desired power level. Usually commands the power control from the ground station transmitted relatively slowly due to delays in the propagation of signals in the forward and reverse direction through the satellite repeater, the propagation time which is approximately 1/2 of a second.

One of the significant differences between systems with satellite and ground-based base station, are the relative distances between the mobile is the Cova and ground systems is the type of fading, which occurs in the transmission channels. Thus, these differences require the implementation of various improvements in the method of power control in the terrestrial system.

In the transmission channel "satellite - mobile subscriber" (satellite channel) satellite repeaters are typically placed in a geostationary orbit. Therefore, all mobile subscribers are about the same distance from the satellite repeaters, and loss on the distribution of signals is also about the same. In addition, the satellite transmission channel has the characteristic loss on the distribution of signals, which varies in inverse square law, i.e., the amount of losses on the propagation of the signal is inversely proportional to the square of the distance between the mobile subscriber and activated satellite repeater. Thus, the deviation values of the path loss in satellite channel while changing a distance usually amount to no more than 1-2 dB.

Unlike satellite channel, in the transmission channel ground station mobile subscriber" (terrestrial channel) distance between mobile subscribers and mobile stations may vary significantly. For example, one of the mobile subscriber is the range of distances can be characterized by a coefficient greater than a hundred to one. The nature of the loss on the distribution of signals in the terrestrial channel is the same as in the uplink transmission. However, the characteristic loss of signal propagation in the terrestrial transmission channel is changed back to the law of change of the argument, raised to the fourth power, i.e., the value of the path loss is inversely proportional to the distance raised to the fourth power. Thus, for a cell region with a radius of 5 miles variations of the path loss can reach about 80 dB and above.

In the uplink transmission usually occurs freezing, defined as the sinking Richie. Therefore, the received signal consists of a direct (i.e. due to direct radiation) component, which is folded repeatedly reflected component with the statistics of the fading with Rayleigh distribution. The ratio of the power of direct and reflected components is usually about 6 to 10 dB depending on the antenna characteristics of the rolling of the subscriber and the environment around him.

Unlike satellite transmission channel fading signal in the terrestrial channel is usually defined component of the Rayleigh fading with no direct component. That the project for a terrestrial channel, than in the uplink, which is prevailing sinking Richie.

Rayleigh fading in the terrestrial transmission channel caused by signal reflections from various physical objects in the environment. As a result of such reflection signal reaches the receiver mobile subscriber, coming almost simultaneously in many different ways and having different transmission delay. For radio communication with mobile objects, including cellular radiotelephone communication system, typically used ranges UHF, when you may experience a significant phase difference of signals transmitted in different ways. This may result in weakening of the signals at the sum and the occurrence of deep fading.

The sinking in the ground channel is highly dependent on the location of the mobile subscriber. A small change in the location of the mobile subscriber affects the change of the propagation delays of signals of all the paths that also affects the phase of the signals on each path. Therefore, the movement of the mobile subscriber can lead to sudden appearance of fading. For example, in the frequency range of 850 MHz cellular radio a freeze usually occurs with intensity one Tamil destructive to signals in terrestrial channel and may result in poor communication. However, to combat fading can use the additional power of the transmitter.

In terrestrial cellular mobile radiotelephone communication system should be organized in a duplex transmission channel, to be able to simultaneously conduct a telephone conversation in both directions as it is implemented in a conventional wired telephone system. This duplex radio channel is usually organized in one frequency band for transmitting tract, i.e., messages from transmitters mobile stations to the receivers of mobile subscribers. The other frequency range is used in the receiving path, i.e., when sending messages from transmitters of mobile subscribers in the receiver mobile stations. This separation of the frequency bands allows the transmitter and receiver mobile subscriber to operate simultaneously without affecting each other, i.e., without interference from the transmitter to the receiver.

The use of separate frequency bands is of great importance in the control of transmitter power mobile stations and mobile subscribers. The use of separate frequency ranges is the reason that fading due to multipath propagation, receiving and who are the best in the transmitting tract and take the same value as path loss in the receiving path. One of the ways to control the power transmitter ground system relating to the present invention, is described in U.S. patent N 5056109, which is used as a reference.

In addition, in the cellular system mobile radio communications of the mobile wireless devices can communicate through numerous mobile station as described in U.S. patent N 5101501, which is used as a reference. In communication systems with a large number of mobile stations in the mobile subscriber and the mobile station contain multiple receiving circuits, as described in the last of these patents and in more detail in U.S. patent N 5109390, which is also used as references.

When there are many cell areas when the mobile subscriber establishes a connection with another person by using a large number of mobile stations, it is also necessary to control the power of the transmitter mobile subscriber to prevent interference to other communications in all cell areas.

Therefore, the aim of the present invention is to provide a new and improved method and apparatus for power control of the transmitter in the terrestrial transmission channel in the presence of neskolkih system.

In terrestrial cellular system mobile radio communications multiple access code division multiplexing is desirable to control the transmitter power of the mobile subscribers to the receiver mobile station signal received from the transmitter of each of the mobile subscribers operating within a cellular system, had a rated power if the transmitter power of all mobile subscribers in the service area of a mobile station will be regulated in this way, the total power of the received mobile station signals will be equal to the nominal power of the received signal, the transmitted mobile subscriber multiplied by the number of subscribers of cellular systems that transmit messages within the cell area. To this value is added to the noise power, perceived mobile station from the mobile subscribers of the adjacent cell regions.

The receivers of the cell system multiple access code division multiplexing convert the broadband signal from the transmitter of one of the mobile subscribers in the narrowband digital signal representing information. At the same time, the other received signals, which are not promotional is the receiver of the cell as the ratio of the power of the useful signal power noise signals, accept mobile station, i.e. a power of a received selected signal, which is the useful signal from the transmitter mobile subscriber to a power of a received signal, which noise signals from transmitters other mobile subscribers. The narrowing of the bandwidth, i.e., the process of correlation, which leads to what is usually called "the gain in signal-to-noise in signal processing", increases the ratio signal to noise ratio from negative to positive, which ensures operation within the allowable error rate, in bits.

It is very important to maximize the capacity of the terrestrial cellular radiotelephone communication stations multiple access code division of channels in terms of increasing the number of simultaneous calls within the bandwidth of the system. It is possible to maximize the system capacity, if you control the transmit power of each mobile subscriber so that the transmitted signal reaches the receiver mobile station with such a minimal signal-to-noise ratio at which it is acceptable recovery data. If the transmission power mobile subscriber signal reaching the receiver honeycomb is the first quality of communication. On the other hand, if the signal strength of the mobile subscriber, is received by a receiver of the mobile station, it is too large, the exchange of messages with that particular mobile subscriber is valid. However, this signal high power is a hindrance to the signals transmitted by other mobile users on the same channel, i.e. in the same frequency range. This disturbance may adversely affect the exchange of messages with other mobile subscribers, if the total number of the transmitting mobile subscribers will not be reduced.

Signal loss on the road in the UHF channel of a cellular mobile radiotelephone communication can be characterized by two factors: the average path loss and fading. Average losses on the road can be described statistically using the log-normal distribution, while the average loss is inversely proportional to the length of the route, raised to the fourth power, and the standard deviation is approximately 8 dB. Another factor is fading caused by multipath propagation of the signals and is characterized by a Rayleigh distribution. Average losses on the route described by a lognormal distribution can be accepted by the zi. However, the above fading with Rayleigh distribution in the frequency ranges of receiving and transmitting tract do not depend on each other. Lognormal distribution of average path loss is a function, which is relatively slow change with position. On the other hand, the Rayleigh distribution is a function that relatively quickly change with position.

The present invention applies the principle of multiple access code division channels to serve a large number of subscribers in a cellular mobile radiotelephone communication system. In such a system, all mobile stations in the area transmit the pilot signal of the same frequency with the same code. Using the pilot signal in systems multiple access code division multiplexing is widely known. In this particular case, the pilot signal is used by mobile subscribers for the initial synchronization of their receivers. The pilot signal is also used as the reference signal frequency, phase and time when the demodulation of the digital speech signals that are transmitted to the mobile station.

In the present invention each podvijnost. To assess the value of path loss in mobile subscriber measure the power of received signals that are transmitted to the mobile station. Thus, the mobile subscriber measures the power of the pilot signal received from the mobile station with which a connection is established. Mobile subscriber also measures the sum of the power levels of signals transmitted by all mobile stations in the mobile-subscriber. The measurement of the sum of the power levels that will be described in detail below, it is necessary in cases when the mobile communication subscriber from a more distant mobile station temporarily is better than are usually preferred the nearest cell station.

Estimation of path loss in the transmitting tract can be performed using non-linear filter. The nonlinearity in the evaluation process is used to ensure a rapid response to a sudden improvement in the characteristics of the channel and a much slower response to the sudden deterioration of the characteristics of the channel. Thus, in response to a sudden improvement in the characteristics of the channel power of the transmitter mobile subscriber decreases rapidly.

With a sudden improvement of the characteristics of the communication channel for one mobile subscriber power signal, the principles of which all signals occupying the same wideband channel. Therefore, quick response to a sudden improvement in communication will reduce interference in the system.

A typical example of the sudden improvement of the characteristics of the channel is the case when a mobile subscriber moves in the field of radio shadow of a large building or other obstacles, and then leave this area. The improved characteristics of the channel as a result of vehicle movement may occur within a few tens of milliseconds. When the mobile subscriber leaves the area of the radio shadow, the rulings of the signal will increase dramatically in power.

Estimation of path loss in the transmitting tract (station-to-subscriber) is movable by the subscriber to adjust the power of its transmitter. Therefore, the stronger the signal is, the lower should be the power of the transmitter mobile subscriber. The powerful reception signal from the mobile station indicates that the mobile subscriber is located next to the mobile station, or found unusually good path propagation of the signal from the mobile station. The strong signal reception means for adopted mobile station signal was rated power required relatively less powerful is the characteristics of the channel, it is desirable that the power of the transmitter mobile subscriber grew much more slowly. This slow increase in transmitter power is desirable because of the dramatic increase in the transmitter power creates additional interference for all other mobile subscribers. Therefore, Pets temporary deterioration in the characteristics of the channel one mobile subscriber to prevent the deterioration of characteristics of the channels of all other mobile subscribers.

With a sudden deterioration in the characteristics of the channel nonlinear filter prevents a sharp increase transmitter power mobile subscriber in response to a sudden decrease in the power of signals received mobile subscriber. The speed of increasing the transmitter power mobile subscriber in most cases should be limited to transmission speed mobile station commands power adjustment, providing feedback, as will be described below, to reduce the transmitter power mobile subscriber. Using commands adjust the power transmitted by mobile station, prevents the increase in transmitter power mobile subscriber to a level significantly greater than the level that is required to and does not occur in the receiving path.

It should be noted that it is undesirable to have a slow response when controlling the power of the transmitter mobile subscriber POI you try to select a fast Rayleigh fading of the slow fading caused by changing the distance and the terrain. Slow response when controlling the power of the transmitter mobile subscriber desirable because it is possible sudden improvement of communication and the emergence of fading affecting the same as on the transmitting path and the receiving. If the response to a sudden improvement in communication will be delayed by the filter, it will often be situations, when the power of the transmitter mobile subscriber becomes too large and would cause interference for other mobile subscribers. Thus, in the present invention when estimating path loss is used nonlinear process with two constant time.

In addition to measurements in a mobile subscriber power of a received signal, it is desirable that his processor was also known transmitter power and antenna gain mobile station (capacity equivalent to an isotropic radiator), the ratio G/T mobile station (the ratio of the coefficient usilenno currently active calls in the cell. This information allows the processor mobile subscriber to correctly calculate the reference power level for the set of local power. These calculations are performed by calculating the change of signal power in transmission from the mobile station to the mobile subscriber to determine the path loss. Then the received loss on the track used in the equation of change of signal power in transmission from the mobile subscriber to the mobile station, the solution of which gives the transmission power of mobile subscriber is required to obtain the desired signal level. This allows the system to be mobile stations with different power levels equivalent isotropic emitter, corresponding to the dimensions of the cell region. For example, for a cell area of the small radius does not require such a large power level, as for cell area in a large radius. However, if the mobile subscriber is located at a certain distance from the cell area with low transmission power, it will take a weaker signal than the signal from the cell region with a high level of transmission power. The mobile subscriber in response to transmit messages with a higher Monastiriou on the transmission characteristics of each mobile station.

Mobile station transmits data on capacity equivalent isotropic emitter of the cell, the ratio G/T, as well as data on the number of active calls in the channel setup. After synchronization, the mobile subscriber receives the data and continues to monitor this channel time search calls from the telephone network of General use, intended for this mobile subscriber. When installing the subscriber's in-vehicle antenna gain mobile subscriber is stored in his memory.

As mentioned above, the power of the transmitter mobile subscriber is also controlled by the signal from one or more mobile stations. When the reception signal of each of the rolling of the person with whom a connection is established, the receiver of each mobile station measures the power of this signal. The measured signal strength is compared with the desired power level signal for that particular mobile subscriber. Formed team of power regulation and is transmitted in this mobile subscriber channel data or voice channel. In accordance with the adjustment power from the mobile station by the mobile subscriber increases or decreases the power pemandu capacity adjustment are formed in all mobile stations. Mobile subscriber responds to these commands power control to avoid installation of such a power level of the transmitter, which would otherwise create interference to other mobile subscribers that communicate with mobile stations, but, on the other hand, would provide a sufficient power level for transmission of messages between a mobile subscriber and at least one mobile station.

The command to adjust the power transmitted by the transmitter of the cell at a relatively high velocity, equal to about one team for a millisecond. The baud rate command, control power must be high enough to track the Rayleigh fading in the receiving channel of the communication channel. In addition, it is desirable to monitor the Rayleigh fading in the transmitting tract, which affects the signal in the receiving path. Transmission speed equal to one team for 1.25 MS, which is sufficient for tracking processes fading when the vehicle speed 25 - 50 miles per hour and communication at a frequency of 850 MHz. It is important to minimize the delay when defining commands adjust the power and its transmission to the state of the channel has not significantly changed while the mobile subscriber is not in the Oh transmission (receiving and transmitting) independent from each other, the power of the transmitter mobile subscriber is managed by a team adjust the power with the mobile station. The receiver of each mobile station measures the received signal strength from each mobile subscriber. The measured signal strength is compared with the desired signal power for this mobile subscriber, and is formed team capacity adjustment. The command to adjust the power transmitted to the mobile subscriber based on the data transmission channel or a voice channel of this mobile subscriber. This command capacity adjustment combined with data evaluation mobile subscriber losses on the road in one direction to obtain the final values of transmitter power mobile subscriber.

One of the possible embodiments of the invention, the command to adjust the power transmitted by overwriting one or more data bits of the subscriber every millisecond. Modulation system used in systems with multiple access and code division multiplexing, can generate codes for error correction for the data of the subscriber. Overwriting associated with command power control is considered as an error or the destruction of the bits in the channel and is adjusted by ispravljeni the bug fixes in many cases, it may be undesirable, as it leads to an increase in the delay of receiving the command to adjust the power and the reaction to it. It should also be noted that a temporary seal for the transmission of bits command power adjustment can be carried out without overwriting characters in the data channel of the subscriber.

The controller or the processor of the mobile station can be used to determine the required power of the signal received mobile station from each of the mobile subscribers. The required power levels of the signals are determined for each receiver of the mobile station. The desired value for the output signal is used for comparison with the measured signal strength for the team formation adjust the power.

The system controller is used to control the processor of each mobile station in accordance with the value of the desired signal power. The nominal power level may be set higher or lower to reflect changes in conditions in the cell region. For example, for a mobile station located in a very "noisy" place or geographic area, the power level in the receiving path may be higher than in normal conditions. However, this increased power level when RA is interference can be compensated by a small increase in power in the receiving path of the stations of the neighboring cell areas. This increase in capacity in the receiving channel of the neighboring cell regions is less than the increase in capacity, which allowed for mobile subscribers operating in "noisy" cell area. It is also clear that the processor of the mobile station may monitor the average error rate in bits. These data can be used by the system controller to control cell processor workstation when you install the appropriate power level of the received signal to maintain acceptable call quality.

It is also desirable to have a means to control the present capacity of each data signal that is passed to the mobile station, in response to the control information transmitted by each mobile subscriber. The presence of such controls, it is advisable mainly because some places the transmit channel from the mobile station to the mobile subscriber can sometimes be very bad. If the transmit power of signals in a given mobile subscriber not to increase, the communication quality may be unacceptable. This situation may occur, for example, in the place where the loss on the road in connection with one or two adjacent cell areas are about the same which is growing three times in comparison with the obstacle, accept mobile subscriber at a point relatively close to the mobile station. In addition, a freeze signal interference coming from neighboring mobile stations does not occur in unison with the sinking of the jamming signal from the desired mobile station. In this case, to achieve meet the requirements of the operational data may require additional increase in signal power for 3 - 4 dB.

In another case, the mobile subscriber may be located at the point at which come several strong signals in different ways, which leads to the hindrance of larger magnitude than usual. In this situation, the increased power of the useful signal relative to noise can produce acceptable results. At other times, the mobile subscriber may be at the point with a very high signal-to-noise ratio. In this case, the mobile station can transmit a useful signal with a lower than normal capacity, reducing interference to other signals transmitted by the system.

To achieve the above objectives in a preferred embodiment of the invention has the ability to measure the signal-to-noise ratio in the receiver mobile subscriber. This measurement is performed by craving values, the mobile subscriber requests additional power transfer messages from mobile stations. If this ratio exceeds a predetermined value, the mobile subscriber sends a request to reduce transmission power.

Mobile station receives the power control of each mobile subscriber and responds by changing the power allocated to the corresponding signal at a preset value. Power control is usually performed on a small amount, typically about 0.5 - 1 dB, or about 12% from the nominal value in one direction or another. Accordingly, other signals transmitted by mobile stations, reduced by the amount of increase in the power, divided by n, where n is the number of other subscribers of the channel that exchanges messages with a mobile phone. Typically, the power reduction can be approximately 0.05 dB. The rate of change of power may be somewhat lower than the rate of change of power in the receiving path, i.e. from the mobile subscriber to the mobile station, approximately once per second. Dynamic range adjustment is also limited to 4 dB decrease from the nominal value and 6 dB in the direction uvelicheny as an example, and that can be quite simple to choose other levels depending on the system parameters.

Mobile station may also consider the requirements for a change in the power of all mobile subscribers and decide whether to grant the request of any subscriber. For example, if the mobile station is operating at full load, requests to increase the transmission power can be made, but not more than 6% from the nominal value, instead of the usual 12%. However, the request to reduce capacity in this mode can be performed, as usual, within 12%.

Features and advantages of the present invention will become more apparent from the subsequent detailed description and drawings, where:

in Fig. 1 presents a schematic depiction of one possible example of a mobile cellular radiotelephone;

in Fig. 2A - 2D are graphs of the power of the signal received mobile subscriber, and transmitting power from a distance;

in Fig. 3 shows a structural diagram of the cell, reflecting the function of the power control according to the present invention;

in Fig. 4 shows a structural diagram of the mobile subscriber, reflecting the function of the power control according to the present invention;

in Fig. 5 shows a structural diagram of Bolg. 6 shows a structural diagram that depicts the elements for power control in the mobile station shown in Fig. 3;

in Fig. 7 shows a structural diagram of the communication system controller with mobile station to control the transmit power of the cell.

In Fig. 1 shows one implementation of the terrestrial mobile cellular radiotelephone according to the present invention. In the system shown in Fig. 1, using methods of modulation multiple access and code division multiplexing to transmit messages between the mobile subscriber system and mobile stations. Cellular systems in large cities can have hundreds of mobile stations serving hundreds of thousands of mobile phones. Using the method of multiple access code division of channels, you can easily increase the number of subscribers in the system compared to conventional cellular systems of the same size that uses frequency modulation.

Controller and switch 10 of the system shown in Fig. 1, typically includes appropriate interface and hardware processing for forming control information for the cell stantine in the appropriate cell station and further to the corresponding mobile subscriber. The controller 10 also controls the routing of calls to mobile subscribers through at least one mobile station in a telephone network of General use. The controller 10 can send calls from one mobile subscriber to another through the corresponding mobile station, so as usual mobile subscribers do not establish a direct relationship with each other.

The controller 10 can connect to mobile stations in different ways, for example by means of special telephone lines, fiber-optic transmission lines or radio. In Fig. 1 for example shows two mobile stations 12 and 14 and two mobile subscriber 16 and 18, which have cell phones. Arrows 20a - 20b and 22a - 22b, respectively, indicated possible links between mobile station 12 and mobile subscribers 16 and 18. Similarly, the arrows 24a - 24b and 26a - 26b respectively indicated possible links between mobile station 14 and mobile users 18 and 16. In normal mode transmit power mobile stations 12 and 14 are identical.

Mobile stations 12 and 14 are typical of terrestrial base stations, determining the service area, however, it should be clear that to provide more umstvennyi satellites, for example, satellites 13 and 15. When satellite communication signals between the mobile subscribers and terrestrial base stations are relayed satellite repeaters 13 and 15. As in the case of terrestrial communications satellite link allows transmission of messages between a mobile subscriber and at least one base station through different relays located on the same satellite or on different satellites.

The mobile subscriber 16 measures the full power of the received pilot signals transmitted by mobile stations 12 and 14 through the channels 20a and 26a. Similarly, the mobile subscriber 18 measures the full power of the received pilot signals transmitted by mobile stations 12 and 14 through the channels 22a and 24a. In each of the mobile subscribers 16 and 18 of the power of the pilot signal is measured in the receiver, where the received signal is a broadband signal. Accordingly, this power measurement is carried out to correlate the received signal with pseudotumour signal with spread spectrum.

When the mobile subscriber 16 is closer to the mobile station 12, the received power is largely determined by the signal in the channel 20a. When the mobile subscriber 16 is closer to the mobile station mobile subscriber 18 is closer to the mobile station 14 received power is largely determined by the signal in the channel 24a. When the mobile subscriber 18 is closer to the mobile station 12 received power is largely determined by the signal in the channel 22a.

According to the measurement results, knowing the power of the transmitter mobile station and the antenna gain mobile subscriber, each of the mobile subscribers 16 and 18 estimates losses on the road to the nearest cell station. The calculated value of losses, together with information on the antenna gain mobile subscriber and the ratio of the gain of the receiving antenna of the cell to the level of noise in its receiver is used to determine the nominal transmitter power necessary to provide the required signal-to - noise at the carrier frequency in the receiver mobile station. Information about the parameters of the cell can either be stored in the memory of the mobile subscriber, or transmitted to mobile station using information of the broadcasting signal on the channel setup to indicate the status of the given mobile station that is different from the nominal one.

By defining the nominal transmit power mobile subscriber in the absence of Rayleigh fading and the assumption that the measurements were carried out perfectly, the signal is at the frequency of the carrier. Thus, the desired characteristic is achieved when the minimum transmitter power mobile subscriber. Minimizing transmit power mobile subscriber is required in a system with multiple access and code division multiplexing, as each mobile subscriber creates interference to other mobile subscribers in the system. While minimizing the transmitter power mobile subscriber system interference will be minimized, which allows you to type within the frequency range of additional subscribers of mobile radio communications. In accordance with this, the system capacity and spectral efficiency will be maximum.

In Fig. 2A shows the effect of Rayleigh fading as a function of distance on the signal strength from the mobile station, the received mobile subscriber. Average losses on the road, shown in the graph of the curve 30, is determined primarily by the distance between the mobile station and the mobile subscriber, raised to the fourth power, and the terrain between them. With increasing distance between the mobile subscriber and the mobile station signal strength, a received mobile subscriber decreases at a constant power cieaura, have a lognormal distribution relative to the average value of the losses.

In addition to a slowly changing average losses on the road with a lognormal distribution law, the existence of different pathways of signal causes a rapidly changing fading, which increases and decreases relative to the average path loss. The signals arrive at the receiver via different paths, with arbitrary phase and amplitude, which leads to the appearance of the characteristic Rayleigh fading. Curve 32 in Fig. 2A corresponds to the change in the value of the path loss as the result of Rayleigh fading. Usually a freeze, resulting in one of the transmission paths between the mobile station and the mobile subscriber (receiving or transmitting) does not affect the appearance of fading in another tract. For example, the appearance of fading in the transmitting tract it is not necessary that in the receiving path at the same time also raises the sinking.

In Fig. 2B shows the power of the transmitter mobile subscriber, adjusted in accordance with the signal power in the channel shown in Fig. 2A. Curve 34 in Fig. 2B depicts the desired average transmit power level corresponding to the middle is adamcik mobile subscriber in response to Rayleigh fading, shows the curve 32 in Fig. 2A. When the signal in the Rayleigh fading (curve 32 in Fig. 2A) is reduced, there is a sharp increase in transmitter power. Such a sharp increase transmitter power can lead to undesirable effects on the performance of the whole system. Therefore, the present invention provides the use of an optional non-linear filter to control sudden changes transmission power in the direction of its increase. In addition, the present invention also uses a closed loop feedback from the station to adjust the power of the transmitter mobile subscriber.

In Fig. 2C shows the power of the transmitter mobile subscriber corresponding to Fig. 2A without regard to power control in a closed loop feedback from the mobile station. In Fig. 2C, the desired average transmit power, represented as curve 34', the power of the signal received mobile subscriber, presented in the form of the curve 30 in Fig. 2A. Curve 38 corresponds to the power of the transmitter when using the optional non-linear filter for power control according to the present invention.

A sharp increase in power is but weak. The curve 38 these emissions significantly weakened by limiting the rate of increase transmit power to a constant value. The resulting change in power of the transmitter relative to the required transmit power is limited by the dynamic range and speed changes. This restriction allows to facilitate the implementation of power control in a closed loop feedback and to increase its efficiency at a much lower speed control data. The transmit power, as shown by curve 38, may be reduced at a much faster rate than the increase.

With increasing distance from point D1 to point D2 transmit power decreases quickly, which corresponds to a sudden improvement in the characteristics of the channel. The distance between the points D2 and D3, is the deterioration of the characteristics of the channel and, consequently, increasing the transmitter power. The deterioration of the characteristics of the channel is not so important, because the maximum speed of operation of the nonlinear filter limits the rate of increase transmitter power.

With increasing distance from the point D3 to the point D4, deterioration of characteristics of the channel is faster than Etait with maximum speed, permissible non-linear filter. When changing the distance between a point D4 to the point D5 starts improving characteristics of the channel. However, the improvement of the characteristics of the channel power of the transmitter continues to grow at maximum speed until, until you reach the desired level, such as at point D5.

In certain cases it is desirable to eliminate the emissions of power, causing excessive interference in the system. With the emergence of a more favorable signal to another mobile station, causing the appearance of excess noise in the system, the quality of communication in the system can be maintained by limiting the rate of increase transmitter power.

In Fig. 2D shows a graph of signal power, the received mobile station, when the movement of the mobile subscriber from the mobile station. Curve 40 refers to the average desired signal power, the received mobile station from the mobile subscriber. It is desirable that the average power of the received signal was constant, but had the minimum value necessary to ensure high-quality communication with a mobile subscriber. In a mobile subscriber correction Rayleigh fading signal received by mobile stations is assignet receiver mobile station. Therefore, the signal adopted by the mobile station, has an average power constant level, but it is still imposed Rayleigh fading, which took place in the receiving path. Curve 42 corresponds to the case when there Rayleigh fading in the receiving path. In the present invention in the terrestrial transmission channel uses a high-speed power control to compensate for Rayleigh fading. In the case of the use of satellite relay speed control without feedback will be less.

In addition, there is a possibility that the mobile subscriber can be the point at which in the absence of fading in the transmitting tract occurs deep sinking in the receiving path. In this case, the connection will be broken, unless an additional mechanism to compensate for Rayleigh fading in the receiving path. Using power control in a closed circuit in the mobile station is such a mechanism to adjust the transmitter power mobile subscriber to compensate for Rayleigh fading in the receiving path. Curve 44 in Fig.20 shows the signal strength from the mobile subscriber, the received mobile station is compensa Fig. 20, curve 44 repeats the shape of the curve 40 except deep fading, which is minimized by controlling in a closed loop.

In accordance with Fig. 3, the antenna 52 is for receiving signals that are transmitted to multiple mobile subscribers and are then fed to an analog receiver 54, where they are amplified, converted to a decrease in high frequency in the intermediate frequency (if) and processed. From the output of the receiver 54 analog signals in the reception area or channel blocks for allocation of information signals subscribers, team-building power regulation and modulation information signals of subscribers for transmission. One of these blocks, designed for communication with a particular mobile subscriber N is the block 50N. Thus, the output of the receiver 54 is connected with a large number of such blocks, including block 50N.

Block 50N includes a receiver 56 digital data, the circuit 53 conversion bandwidth of the digital baseband signals of the subscriber circuit 60 measurement of the received power and the modulator 62 of the transmission signals. The receiver 56 digital data receives broadband signals with spread spectrum and performs correlation and signal compression, pecena information from the mobile subscriber N. The receiver 56 digital data produces narrowband digital signals in the circuit 58 conversion bandwidth of the modulating signal. The receiver 56 digital data also produces a narrowband signal in the circuit 60 measurement of the received power.

Scheme 60 measurement of the received power measures the power level of the signal from the mobile subscriber N. In accordance with the measured power level circuit 60 measurement of the received power generates a command to adjust the power, which is fed to the input of the modulator 62 of the transmission signals for transmission to the mobile subscriber N. As already mentioned, the data bits command adjust the power used in a mobile subscriber N to adjust the power of its transmitter.

If the measured value of the received power is above a preset threshold processor mobile station (not shown), is formed corresponding command to adjust the power. If the measured value of the received power is below a preset threshold level, then the bits are formed team power adjustment, which indicates a mobile subscriber on the need to increase the power of its transmitter. Similarly, EA team power adjustment, which indicates a mobile subscriber on the need to reduce the power of its transmitter. Team power control is used to maintain a nominal power level of the signal received by the cellular station.

The output signal from the receiver 56 digital data enters the circuit 58 conversion bandwidth of the modulating signals that implements the interface to communicate with the intended recipient of the information through the controller and the switch system. Similarly, the circuit 58 conversion bandwidth of the modulating signal receives information signals intended for the mobile subscriber N, and transmits them to the modulator 62 of the transmission signals.

The modulator 62 modulates transmission signals a broader spectrum of addressable user information signals for transmission to the mobile subscriber In N. modulator 62 of the transmission signals also receives data bits command adjust the power from the circuit 60 measurement of the received power. Data bits command control power is also modulated with the extension of the spectrum at the modulator 62 for transmission to the mobile subscriber With N. modulator 62 modulated signal with the spread spectrum goes through the circuit 63 controls the power of the Directors other blocks of this mobile station.

The combined signals from the spread spectrum received at the adder 66, where they are combined with the pilot signal produced by the generator 68, the pilot signal. Then these combined signals in the circuit (not shown) converting the intermediate frequency in a high frequency and amplified. Then RF signals received at the antenna 52 for transmission. Although not shown, the control circuit transmit power may be located between the adder 66 and the antenna 52. This scheme is under the control of the processor the mobile station responds to the transmitted mobile subscriber signals to adjust the power that demodulated in the receiver mobile station and transmitted to the control processor of the mobile station associated with this schema.

In Fig. 4 shows a diagram of the mobile subscriber, such as mobile subscriber N, which contains the antenna 70 for receiving signals from mobile stations and the radiation generated in the mobile subscriber signal multiple access code division of channels. Typically, the antenna 70 is comprised of two separate antennas, transmitting and receiving. Mobile subscriber N receives the pilot signal, the signals of the installation channel and others, addressed to him signals through the antenna 70, the crystals RF multiple access code division multiplexing, converts them into signals of the inverter and filter frequencies. The frequencies received in the device 74 to receive digital data for digital processing. The receiver 72 also includes an analog circuit for measuring the total power of the received signals. This measurement is necessary to provide the feedback signal coming into the circuit 76 to control the transmit power.

The receiving device 74 consists of several receivers of digital data. One of them, the receiver 74a, is used for detection of pilot signals that are transmitted to each mobile station. These pilot signals may be signals of multipath propagation from one mobile station, may be signals transmitted by different stations, and can be a combination of both. The pilot signals transmitted by different mobile stations have the same extension code, but different phase shift code to identify a particular mobile station. The receiver 74a generates the control processor 78 signals indicating the strongest pilot signals regardless of whether they act with one mobile station, coming in different ways, or with multiple mobile stations. Control processor 78 uses the data coming from priemnikami data also contains several receivers 74b and 74c. Although shown only two receivers, the number may be more. Receivers 74a and 74b are used for compression and correlation of received signals addressed to the mobile subscriber N from one mobile station or more mobile stations in the case of multiple cell areas. Receivers 74b and 74c are designed for signal processing of multipath propagation with a single mobile station or signals from different mobile stations. Under control of control processor 78 receivers 74b and 74c process the signals intended for the mobile subscriber. Usually receivers 74b and 74c are designed for processing digital data signals of the subscriber spread spectrum, which correspond to the identified receiver 74a strongest pilot signals.

Receiver 74b and 74c demodulated data of the subscriber, such as the encoded digitized speech signal received in scheme 75 combine and decode. Scheme 75 combines various signals from receivers 74b and 74c, into a single data signal to the subscriber regardless of whether they are signals of multipath propagation from one station or signals from different stations. Circuit 75 performs dekodyrovanyya frequency digital baseband signals to interface with the subscriber. Scheme 82 conversion bandwidth of the modulating signal includes a hardware interface to communicate receptor modulator 74 and 84 of the transmission signals from the handset of the subscriber (not shown).

Receivers 74b and 74c are also designed to separate the digital data of the subscriber from the commands adjust the power produced by the cell station (stations) and transmitted together with the data of the subscriber. Selected bits of the command to adjust the power sent to the control processor 78. The processor 78 analyzes commands power control for controlling transmission power of mobile subscriber.

In the case of one mobile station, when the one or more signals (signals multipath propagation) are processed by the receiver 74b and 74c, team capacity adjustment is recognized as a team with one mobile station. In this case, the processor 78 in response to the command power control generates a command control transmit power that is fed into the circuit 80 controls the transmit power. When teams adjust the power point to the need to increase the transmitter power mobile subscriber, the controller 78 outputs a signal to the circuit 76 of upreti indicate the need to reduce the power of the transmitter mobile subscriber, the processor 78 outputs a signal to the circuit 76 controls the transmit power to reduce transmitter power. However, in the case of multiple cell processor 78 should be taken into account additional factors.

In the case of multiple mobile stations commands adjust the power comes from two different mobile stations. Power value of the transmitter mobile subscriber measured by these stations may be different and therefore requires a thorough approach to the management power of the transmitter mobile subscriber to prevent this power level signal, which can adversely affect the communication between the mobile stations and other subscribers. As the process of team formation adjust the power in the cell is not affected by the other mobile station, the mobile subscriber must respond to commands received, so as not to impact negatively on other subscribers.

In the case of multiple mobile stations in the formation of both mobile stations commands adjust the power to increase the transmitter power mobile subscriber control processor operates by implementing a logic function, And generates a control signal power, the settlement of the Chica. In this example, the request to increase the capacity corresponds to the logical value "1", while a request to reduce power corresponds to a logical "0". Circuit 76 controls the transmit power in accordance with the signal level of the power control shall increase the transmitter power. This situation may occur when, for one reason or another channel of communication with both mobile stations is deteriorating.

When one of the mobile stations issues a request to increase the power of the transmitter, and the other on the decrease, the processor 78 again implements the execute logical functions "And" and generates a control signal power for the circuit 76 controls the transmit power, pointing to the need to reduce transmitter power. Circuit 76 controls the transmit power in accordance with the signal level of the power control performs the reducing power of the transmitter. This situation may occur when the communication channel with one of the mobile stations is deteriorating, while the communication channel with another mobile station is improved.

As a result, the power of the transmitter mobile subscriber increases only when all of the cell to which the at least one or more of these stations requests a decrease in power. According to this scheme, the transmission power of mobile subscriber will not exceed the level at which you can create excessive interference to other subscribers of the system, and this will be maintained at a level sufficient to enable communication with at least one mobile station.

In more detail the functions of the receiving device 74 in communication with multiple mobile stations described in the above U.S. patent N 5109390. These functions are also listed in the above U.S. patent N 5101501.

The processor 78 also forms the install command level coming into the circuit 76 controls the transmit power, to set the transmitter power level in accordance with the measured analog receiver 72 is the power of the broadband signal. Learn more about the interaction of the receiver 72, circuits 76 and 78 control the transmit power and processor 78 will be described further in the description of Fig. 5.

Data to be transmitted through the circuit 82 conversion bandwidth of the modulating signal, where their coding, proceed to the modulator 84 of the transmission signals. In the modulator 84 signals of the transmission data is modulated with the extension of the spectrum in accordance with the assigned code extensions. Signals with ASD the bottom of the power signal is carried out in accordance with the power control of the transmission, coming from the processor 78. Regulated power signal from circuit 80 controls the transmission power circuit 76 controls the transmit power, where is the adjustment in accordance with the control signal obtained from the results of measurement in an analog receiver. Despite the fact that in Fig. 4 shows two separate control unit transmit power, the power level can be adjusted by a single amplifier with adjustable gain in accordance with two input signals are combined before entering into this amp. However, in the shown example, the two control functions are implemented in separate units.

When the control circuit power is shown in Fig. 4, the receiver 72 measures the total power level of all the signals received from all mobile stations. The measurement result of the power level used to control the power level set by the circuit 76 controls the transmit power. Circuit 76 controls the power transmission includes a circuit in which the rate of increase transmitter power is limited to non-nonlinear filter as mentioned above. The speed of increasing the capacity of ustanavlivat the commands from the mobile station to decrease power, processed in the receiving device 74 and the processor 78.

In more detail the process of power control in a mobile subscriber N, shown in Fig. 4, described with reference to Fig. 5. In Fig.5 accepted by the antenna, the high frequency signals received at the transducer 90 with decreasing frequency, where they are converted into signals of the inverter. The frequencies are received in band-pass filter 92, in which out-of-band frequency components are removed from the signal.

The filtered signals from filter 92 to the amplifier 94 intermediate frequency with an adjustable gain, where they are amplified. Amplified signals from amplifier 94 in the analog-to-digital Converter (not shown) for performing digital signal processing. The signals from amplifier 94 is also provided in the detector 96 with the scheme of automatic gain control (AGC).

The detector 96 with AGC produces a control signal which is supplied to the control input of the amplifier 94. This control signal is used to control the gain of the amplifier 94 to maintain a constant average power level signal from its output to the input of analog-to-digital Converter.

The detector 96 with AGC also generates a signal postopera mobile subscriber (not shown). This signal setup level characterizes the desired reference power level of the transmitter. The data input signals are compared in the comparator 98, and the signal corresponding to the result of comparison is supplied in the optional non-linear filter 100. This signal corresponds to the deviation of the measured power of a received signal from the desired power level of the transmitter mobile subscriber.

The filter 100 may be implemented by a simple registerno-diode-capacitor circuit. For example, the input filter can be the connection point of the two resistors. The other ends of the resistors are connected to respective diodes. The diodes are connected to the resistors in opposite directions of their conductivity, and the other ends of the diodes are connected together and form the output of the filter. A capacitor connected between the connection point between the diodes and ground. Filter circuitry is designed to limit the rate of power increase to values not exceeding 1 dB per millisecond. The speed reduction power is typically set such that she was ten times greater than the rate of increase of the capacity, i.e. 10 dB per millisecond. From the output of the filter 100, the control signal power is supplied to operate the combined 98 and the filter 100 estimate of signal power, accept mobile subscriber, and the necessary correction power of its transmitter. This correction is used to maintain the desired power level of the transmitter in terms of fading in the transmitting tract, the same as in the receiving path.

The modulator 84 transmission signals shown in Fig. 4, produces a low-if signal with spread spectrum coming into the amplifier 104 with adjustable gain. The gain of amplifier 104 is regulated by the control signal power level from the CPU 78 (Fig. 4). This control signal is obtained from the command power control in a closed circuit, the transmitted mobile station and processed mobile subscriber as mentioned in the description of the schema shown in Fig. 4.

Team power control consists of a sequence of commands to increase and decrease power, which accumulate in the processor of the mobile subscriber. First control processor mobile subscriber sets the nominal level of the gain control. Each team is to increase the capacity increases the value of the signal gain, respectively, to increase the gain of the amplifier is approximately NGOs to reduce the gain of the amplifier is approximately 1 dB. The signal gain is converted to analog form in digital-to-analogue Converter (not shown) and supplied to the amplifier 104 as signal and power management.

The reference power level of the transmitter mobile subscriber can be stored in a memory of the control processor. Alternatively, the reference power level can be contained in the signal transmitted to the mobile subscriber. These commands are contained in the signal are allocated in the receiver of digital data and are interpreted by the control processor at the installation level. The output signal from control processor is converted to a digital to analog Converter (not shown) and is fed to the input of the comparator 98.

The output of amplifier 104 is connected to the input of the amplifier 102. As mentioned above, the amplifier 102 is also the if amplifier with adjustable gain, the gain of which is determined by the control signal power level from the filter 100. Thus, the transmission signal is amplified in accordance with the gain set by the control signal power level. Next, the amplified signal from the output of amplifier 102 is again amplified and converted into a signal of high frequencies is Yu in the mobile station, it is shown in Fig. 3, shown in Fig. 6. In Fig. 6, the signal from the mobile subscriber, is received by the cellular station. The received signal is processed in an analog receiver of the cell and the unit cell station, which belongs to the mobile subscriber n

In the receiver 56 digital data shown in Fig. 3 adopted by the analog signal is converted into a digital code into an analog-to-digital Converter 110. The digital signal output from the analog-to-digital Converter is fed to the correlator 112 pseudo-random noise signal, where the signal is subjected to a process of correlation with the pseudo-random noise signal from generator 114 pseudo-random noise signal. The output signal from the correlator 112 pseudo-random noise signal enters the digital filter 114 fast Hadamard transform, where it is filtered. From the output of the filter 114, the signal supplied to the decoder 116 data of the subscriber from which the subscriber data delivered in digital mapping of the frequency band of the modulating signals. From the decoder 116 of the greatest symbols of transformation, Hadamard come into the scheme 118 averaging power. Scheme 118 averaging power averages the greatest character conversion is l, corresponding to the average power level is supplied from the circuit 118 averaging the power in the comparator 120. In the comparator 120 also receives a setting signal power level corresponding to the desired power level of a received signal. This required power level is set to the control processor of the cell. The comparator 120 compares two input signals and produces an output signal indicating the deviation of the average power level from the desired power level. This signal is applied to the generator 122 commands to increase/decrease power. The generator 122 in accordance with the signal comparison generates a command to increase capacity, or a command for lowering the power. Control commands power from generator 122 receives the modulator signal transmission mobile station for transmission to the mobile subscriber N, in order to control the power of its transmitter.

If the power of the received mobile station from the mobile subscriber N signal is higher than its rated capacity, it generates a command to decrease power and transmitted to the mobile subscriber N. If the power level of the received mobile station signal is too small, it is generated and returned to the team to increase capacity. Scotoil of one bit, it slightly changes the bit rate of the digital speech signal of high quality.

Feedback is generated by the command transmission power control compensates for changes in the receiving path (mobile abonentlari), which does not depend on the state of the transmitting tract (station - mobile subscriber). These changes in the receiving path not taken into account in the measurement signal in the transmitting channel. This means that the estimation of path loss in the transmitting tract and accordingly adjusts the transmitter power does not reflect changes in the receiving path. Thus, the feedback provided by the teams capacity adjustment is used to compensate for the adjustment of transmitter power mobile subscriber based on the estimation of path loss in the receiving path, which does not occur in the transmitting tract.

When using the feedback control is highly desirable that the team was entered by the mobile subscriber before will significantly change the state of the channel. The present invention provides for the creation of a new and improved control circuit power in the mobile station to reduce delays and of wait States when measured on the digital team provide quality control process of the power in the cellular radiotelephone system.

As already mentioned, it is also desirable to control the transmit power of the cell in response to requests from the side of the mobile subscriber. In Fig. 7 shows a typical structure of a mobile station, which includes the blocks 50A-50Z. Blocks 50A-50Z executed as block 50N, shown in Fig. 3. In Fig. 7 as an example, assume that the mobile subscriber N communicates with block 50N.

Each of the blocks 50A-50Z is connected with the controller 10 of the system as mentioned in the description of Fig. 1. Each of the blocks 50A-50Z receives over the communication channel from the controller 10 system requests from the mobile subscriber, demodulates them and relays in the controller 10. The controller 10 in response to the request of the rolling subscriber to increase the transmit power of the corresponding block can reduce the transmit power of some or all of the remaining blocks to a small value. The controller system 10 transmits a command to the power control in the mobile station, usually in the control processor of the cell. In response to the command control processor mobile station reduces the transmission capacity of other blocks of the cell. Lowering power other blocks makes it possible to increase the power transfer unit maintenance C the transmission. The application of this method does not change the total power of the transmission blocks of the cell, i.e. the sum of the powers of the transmitters of all blocks is not changed.

As already mentioned, the block 50N, shown in Fig. 3, transmits messages with a rated capacity. The power level is set using the commands from the control processor of the cell, and the team in the control processor of the cell is modified in accordance with the command from the system controller. Submitting commands to the circuit 63 controls the transmit power is typically used to reduce transmitter power. Circuit 63 controls the transmit power can be implemented as an amplifier with adjustable amplification as mentioned in the description of Fig. 5.

In accordance with Fig. 4, the quality of the received mobile subscriber data signal is estimated by the error in the data block transfer. This assessment determines the level of compliance of the signal power, while excessive error rate in the data block indicates a lack of signal strength. Information about errors in the data block can be formed by the known schemes of error correction, for example, by using so methods. Other well known methods can be used for the direct or indirect power measurement signal. Other methods include re-coding of data and their comparison with the original transmitted data, for indicating errors. It should be also clear that the power of the data signal can be measured and used as an indicator of the quality of the communication channel.

Information about errors in the data block supplied to the processor 78. If the error rate for a certain number of data blocks, for example, five blocks exceeds a predetermined limit level, the controller 78 generates a request message to increase the power supplied to the modulator 84 of the transmission signals. The modulator 84 transmission signals modulates the request signal to increase the capacity for transmission in the mobile station.

It should be clear that the system controller through the blocks of the cell may require that the power measurement was carried out in mobile subscribers. Each of the mobile subscribers transmits data about the measured power in the system controller. In accordance with these data, the controller may adjust the transmit power of the different blocks of the cell which enables you to implement or use it to any expert in the art. There are various modifications of these options, and can be used the basic principles mentioned in this description, for the implementation of other options without further invention. Thus, the present invention is not limited to the described variants and has a wide scope, corresponding to the principles and characteristics specified in this description.

1. System for power control of the transmitted signals from each of the rolling phone (16, 18) in a cellular system mobile phone subscribers which share information with each other through multiple cell stations (12, 14), using the signals (20, 22, 24, 26) spread spectrum and multiple access, code-division multiplexing, in which each mobile phone has an antenna (70), at least one transmitter (84) and receiving device (72, 74), and each mobile station (12, 14) has the antenna (52), at least one transmitter (62) and at least one receiver (54, 56), characterized in that it includes first means (78) power measurement of the received signals, connected to the receiving device (72, 74) of the rolling phone, first means (76) capacity adjustment connected to the transmitter (84) movably the transmitted signal respectively decreasing and increasing the capacity measured are listed first means for measuring the power, relative to the first predetermined power level, many second means (60) power measurement, each of which is connected to a respective receiver (54, 56) of the cell, to measure the power of signals received from the mobile phones, and many shapers (60) commands power adjustment, each of which is connected to the corresponding transmitter (62) mobile station, for transmitting a corresponding transmitter (62) of the cell command representing a request to increase or decrease the transmitter power rolling phone if the power measured by the second measuring means power, respectively below or above a second level, and second means (80) capacity adjustment connected to a specific receptor and transmitter of rolling phone, to reduce the signal power of the transmitter when receiving from at least one mobile station request to reduce capacity and increase the signal strength of the transmitter, if received from the mobile stations team capacity adjustment are prompted to increase the signal strength of the transmission specified podvizhnichestva to generate and supply the first means (76) adjust the power of the first signal power measurement, representing the sum of all simultaneously received signals in connection with code division of channels in a given band of frequencies.

3. The system under item 2, characterized in that the first means to adjust the power contain a comparator (98) having inputs for receiving first specified signal power measurement and the first setting signal power level corresponding to the desired power level and the power amplifier (102) with adjustable gain, connected to the specified transmitter (84) rolling phone and the comparator output, to change the power of the transmission signal depending on the output signal of the comparator.

4. System according to any one of paragraphs.1 to 3, characterized in that service area correspond to terrestrial locations of mobile stations (12, 14).

5. System PP.1 to 3, characterized in that at least one satellite repeater is used for communication with mobile phones (16, 18).

6. Device for power control of the transmitted signal cell rolling phone (16, 18) associated with many mobile stations (12, 14) using signals (20, 22, 24, 26) spread spectrum and multiple access code division canadaweb division of channels in accordance with the assigned extension function, modulated input information signal to the mobile subscriber and associated with the antenna receiver (72, 74) for receiving communication signals with a code division of channels from at least two of these mobile stations and spectral processing received from at least two stations signals in accordance with the assigned extension function for recovering the information signal intended for the specified rolling phone, the at least two mobile stations transmit commands to control the output of signals with spread spectrum destined for a specific rolling phone, and the specified receiver (72) accepts and displays these commands power control, characterized in that it comprises means (78) measurement of total power at the same time the received communication signals, code-division multiplexing, functionally associated with the specified receiver (72, 74), for the issuance of the measurement signal corresponding to the measured power, the means (76) adjustment, functionally associated with the specified transmitter (84) for receiving the specified signal measurements and for measuring the signal power of the transmitter in reverse depending on changes in the measured power is asanobu the transmitter and receiver, for receiving from the receiver of these commands adjust the power and reduce the signal strength of the transmitter, if adopted at least one of the said at least two mobile stations team capacity adjustment are commands to reduce the signal strength of the transmitter, and increase the signal strength of the transmitter, if received from all of the above at least two mobile stations commands adjust the power present team to increase the signal strength of the transmitter.

7. The device according to p. 6, wherein each of the at least two specified mobile stations (12, 14) includes means for measuring the power transmitted to the specified cellular mobile telephone (16, 18) signals (20, 22, 24, 26) in connection with code division multiplexing and team-building capacity adjustment, indicating at least the increase or decrease capacity signals of the specified cell rolling phone, to maintain a predetermined power level signals, code-division multiplexing, taken from the specified cell rolling phone at least one of the said at least two mobile stations.

8. The device according to p. 6, characterized is serenia power and the first setting signal power level, to compare these signals and outputting a corresponding output signal and comparison means (102) gain adjustable gain, having the input connected to the output means of comparison, and output, functionally associated with the specified transmitter to change the signal strength of the specified transmitter (84) in accordance with the output signal of the means of comparison.

9. The device under item 8, characterized in that said additional means (80) adjustments include means (78) processing for accumulating these commands adjust the power with a predetermined level setting gain control, having inputs receiving the specified commands, and the output of issuance of the corresponding signal power adjustment, and additional means (104) gain adjustable gain, connected to the specified transmitter (84) and output means (78) processing, to measure the signal strength of the specified transmitter in response to the specified adjustment signal power.

10. The device according to p. 6, characterized in that at least one service area corresponds to the terrestrial location of at least one of the two mobile stations (12, 14).

11. The device according to p. 6, annih mobile stations for communication with mobile phones (16, 18).

12. The method of controlling the power of signals transmitted by a mobile telephone (16, 18) in a cellular system, a mobile phone, in which subscribers exchange information signals to each other through at least one mobile station using multiple access code division channels and signals spread spectrum communications, and a mobile phone having an antenna, a transmitter (84) and a receiver (72, 74), using communication signals, code-division multiplexing supports communication with at least two of these mobile stations, each of which has an antenna, at least one transmitter and at least one receiver, wherein the measured power (78) signals (20A, 22A, 24A, 26a) in connection with code division of channels received by the receiver specified rolling phone, change the power output (80) of the signal of each respective transmitter (84) rolling reverse phone depending on changes in the measured power relative to the first predetermined power level, measured power (60) of each signal (20b, 22b, 24b, 26b) in connection with code division multiplexing, adopted by the receivers of at least two of these mobile stations (54, 56) from from the kleinem power, measured at least in these two cell stations, from the second predetermined level and representing a request to increase the transmitter power rolling phone if the power measured in each of the specified mobile stations, below the second power level, and a request to decrease the transmitter power rolling phone if the power measured in each of the specified mobile stations, the above-mentioned second power level, transmit these commands adjust the power with these information signals of at least two specified mobile stations in a specified mobile phone take each corresponding receiver rolling phone the appropriate commands adjust the power and reduce the signal strength of the transmitter specified rolling phone, if the specified commands adjust the power received from at least one of the said at least two mobile stations requesting the reduction of the signal power of the transmitter and increase the signal strength of the transmitter rolling phone, if the specified commands adjust the power received from all of the above at least two mobile stations, at the specified team building (122) adjust the power form the command (122) increase capacity in response to the power reduction, measured the corresponding mobile station, below the second predetermined power level and form of the command (122) reduce capacity in response to increasing capacity, measured the corresponding mobile station, the above-mentioned second predetermined power level.

14. The method according to p. 12 or 13, characterized in that at the specified measuring the power of signals in connection with code division of channels received by the receiver of each respective rolling phone, measure the power sum of all simultaneously received signals multiple access code division of channels within a predetermined frequency range.

15. The method according to p. 14, characterized in that it further form the first signal power measurement corresponding to the specified measured power of the communication signals multiple access code division of channels received in the receiver specified rolling phone.

16. The method according to p. 15, characterized in that at the specified measuring the power of the transmission signals of the specified transmitter rolling phone compare said first signal (98) power measurement with the first signal level settings monolignol in the transmitter rolling phone in accordance with the comparison results.

17. The method of controlling the power of the transmission signals in a cellular mobile telephone (16, 18) associated with at least two mobile stations (12, 14) using a multiple access code division channels and signals (20, 22, 24, 26) spread spectrum communications, and containing an antenna connected to the transmitter (84) that generates and transmits a carrier signal with a code division multiplexing in accordance with the assigned extension function, modulated input information signal to the mobile subscriber, and a receiver (72, 74), which receives signals (20A, 22A, 24A, 26a) in connection with code division of channels from the two mobile stations and performs spectral processing these received signals, code-division multiplexing in accordance with the assigned extension function to restore the output information signal intended for the use of the specified cell rolling phone, and these at least two mobile stations transmit command (122) power control in communication signals, code division channels destined for a specific cell rolling phone, and the specified receiver handles (78) these adopted COMAND both communication signals, code-division multiplexing, change power (76) of the signal transmitter in reverse depending on changes in the measured power of signals relative to a predetermined power level and change the power output (80) of the signal transmitter in accordance with the commands adjust the power by reducing the signal strength of the transmitter, if at least one of received from at least two of these cell commands power adjustment requests a decrease of the signal power of the transmitter (84), and by increasing the signal power of the transmitter, if all taken from at least two base station commands the power control request to increase power signals from the transmitter (84).

18. The method according to p. 17, wherein in said at least two mobile stations measure the power (60) signals (20b, 22b, 24b, 26b), code division of channels that are transmitted to the specified mobile phone, and form teams (122) capacity control to increase or decrease the signal strength in a specified cell phone to maintain a predetermined power level of communication signals, code-division multiplexing, accept at least one of the said at least two mobile stations is sannam the measurement of the total power at the same time the received communication signals, code-division multiplexing optionally form a measuring signal, corresponding to the measured power signal, and at a specified change in the signal power of the transmitter in reverse depending on changes in the measured power of signals relative to a predetermined power level is formed from a first setting signal power level corresponding to the desired power level of the transmitter cell phone, compare (98) the first signal power measurement with a first setting signal power level, to form a signal corresponding to the difference between the compared signals, limit the differential signal, change the power (102) signal specified transmitter in accordance with the limited differential signal.

20. The method according to p. 19, characterized in that at the specified wattage (80) of the signal transmitter in accordance with the commands of the capacity adjustment process specified commands adjust the power to generate commands to increase power if both commands received adjust the power from all of the above at least two mobile stations to indicate increase the power of the transmitter, and for issuing a reduction of power, if at least one of odnovremenno power signals from the transmitter, accumulate these commands increase and decrease capacity in relation to a predetermined setting level gain control, generate the adjustment signal power corresponding to the specified accumulated commands and changes the signal of the specified transmitter in accordance with the adjustment signal power.

21. System for power control of the transmitted signal units (50 A-Z) of the cell in response to a request to adjust the power coming from the rolling phones, cellular system mobile phone, in which subscribers exchange information with each other through the controller (10) and at least one mobile station (12, 14), using multiple access code division channels and signals (20, 22, 24, 26) spread spectrum communications transmitted between mobile stations and mobile phone subscribers, each mobile station includes an antenna (52) and a plurality of blocks for communication with mobile phones (16, 18) and each of at least two blocks of the mobile station communicates with a corresponding mobile phone, and every mobile phone has an antenna (70), the transmitter (84) and a receiver (72, 74), call the script with code division multiplexing, transferred from the block of the cell in relation to the required level of quality, as well as for the formation and transfer in the specified unit (50A-Z) mobile station a request for power control, if certain specified means of the signal quality is lower than the specified desired level of signal quality, installed in the specified unit (50A-Z) of the cell means of transmitting the specified request to the power control in the controller (10) system installed in the specified system controller means generating and transmitting commands to adjust the power in each of the blocks of the specified mobile station in response to the specified request, and mounted in each unit cell station means receiving the specified command power regulation and increase in accordance with the command signal with a code division of channels transmitted to the specified mobile phone from which the request arrived, on pre-determined value, and reduction in accordance with this command the power of signals transmitted by every other unit cell station to the relevant mobile phones that have these units installed communication, at a pre-specified value.

22. System on p. 21 different is the amount of the reduction of signal power of any other unit is equal to the specified amount of increase in signal power, divided by n, where n is the number of other blocks that have a connection with the respective mobile phones.

23. The system under item 21 or 22, characterized in that when controlling transmission power specified block and other blocks of the cell signal, the total power of the transmitted blocks signals essentially unchanged.

24. System on p. 21, characterized in that the controller (10) system has an output for transmitting a control message to at least one of the specified blocks of the cell in the corresponding mobile phones, and means for determining the quality (74, 75) of the transmission signals in each mobile phone is made with the possibility of reception of this message and issuing a response message about the quality of the signals for transmission through the corresponding block (50 A-Z) of the cell input controller specified (10), which made the possibility of forming a second command to the power control in accordance with the received response message and transmitting the second command to adjust the power to each block of the specified mobile station, and mentioned means for receiving commands adjust the power in each unit cell stations have entrance is galow code division of channels, transmitted to each mobile phone, at a pre-specified value.

25. System for power control of signals transmitted blocks (50-Z) of the mobile station, in response to a request to adjust the power coming from the rolling phones, cellular system mobile phone, in which subscribers exchange information with each other through the controller (10) and at least one mobile station (12, 14), using multiple access code division channels and signals (20, 22, 24, 26) spread spectrum communications transmitted between mobile stations and mobile phone subscribers, each mobile station contains many blocks for communication with mobile phones (16, 18), each mobile phone has an antenna (70), the transmitter (84) and a receiver (74, 75), and each mobile station has an antenna (52), at least one transmitter (62) and at least one receiver (54, 56), characterized in that it contains installed in a mobile phone is a means of determining the quality (74, 75) transmitted to it from the mobile station signal code division of channels with respect to the desired level of signal quality, the generation of a request for power control, if the main request in the specified block of the cell, means of increasing the signal strength module of the cell transmitted in the specified mobile phone on pre-determined value in response to the specified request to the power control.

26. System on p. 21, characterized in that the amount of increase in signal power is about 1 dB.

 

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