Communication system and method for dynamic optimization of its characteristics

 

(57) Abstract:

The communication system comprises a receiver and a transmitter for transmitting communication signals to this receiver. The transmitter adjusts the power level in transmission mode in response to the control signals of the power transmitted by the receiver. The receiver includes an attenuator that serves to attenuate the received communication signals, and means for measuring the intensity of the attenuated signal. The measured intensity signal to control the attenuator and the means of power control in transmission mode. These two tools adjust accordingly the degree of attenuation in the receiver and the transmitter power level in such a way as to optimize characteristics of the system. These characteristics can be attributed maintaining a weak signal within the dynamic range of the receiver, and the elimination of interference by adjusting the attenuation of the receiver in order to form an effective dynamic range to receive only those signals which exceed the noise level, and at the same time increasing the power level in transmission mode to provide ingress communication signal within the effective in the received communication signal. The present apparatus and method can also be used in systems containing multiple receivers connected to a common antenna through a multi-channel splitter. 4 N. p., 15 C.p. f-crystals, 6 ill.

The invention relates to communication systems, containing transmitters and receivers, and more particularly to a communication system that optimizes operational performance through dynamic regulation of transmitter power and attenuation in the receiver.

In a typical communication system, for example in a cellular telephone system, the receiver is designed to work with signals in a certain range of intensities. This range of intensities is called the dynamic range of the receiver. The smallest signal that can be received by the receiver, determines the sensitivity of the receiver, and the signal with the highest intensity defines the limit of locking (saturation).

In a cellular telephone system, the distance between the base station and mobile (mobile) station is changed when the movement of the mobile station within the cell of the honeycomb structure. As a consequence, in large cells changes in signal intensity can be very high. Sometimes these changes become so snacky cells rather, it would change or offset dynamic range, i.e., the range of signal intensities determined maximum and minimum received signal, in accordance with the distance between mobile and base stations.

The dynamic range of the receiver can be displaced (moved) by introducing attenuator between the antenna and the receiver. If you increase the attenuation increases as the smallest and most dense permissible levels of received signals. Similarly, when reducing the attenuation dynamic range shifting to lower values of the intensities of the signals. This impact attenuation of signals in the dynamic range is illustrated in Fig. 1. When the attenuation set to 0 dB, the dynamic range of the receiver 101 is determined by the sensitivity 102 and the saturation limit 103.

If the attenuation increases by 3 dB, the dynamic range is shifted to a new region 104 defined by the sensitivity 105 and the saturation limit 106, both of which are mainly of 3 dB higher than the sensitivity 102 and the saturation limit 103 in the case of attenuation of 0 dB. Similarly, if the attenuation is set at 6 dB, sensitivity 108 and saturation 109 increase again, forming a new dynamic range of pret to be very small. This can lead to interference in the reception frequency band, if there are large cells that spans the same space as a small cell. Such large cells may belong to the same network as the small cell, but may also be part of another network, operating in the same or adjacent frequency band. Measure mentioned interference may be the frequency of bit errors in digital communication systems. In analog systems can use other criteria for assessing the quality of signals, such as the total distortion of the modulated pilot signal (reference signal).

The described situation is illustrated in Fig. 2, which shows a base station 201, which is located in the cell 202, and the base station And 203 in the cell 204. You can see that the cell 204 is smaller than the cell 202 and determines the geographic area within or near the cell 202. As a result of such differences in cell size one relative to another cell 202 can be called a "macrocell", and the cell 204 "microcache". When the mobile station 205, a member of the macrocell" 202 moves near the base station And 203, in its receiver noise may occur from exposure to the mobile station 205. This situation can occur even if the band of radio frequencies is ncii 205.

If the base station And 203 provided with a dynamically adjustable attenuator is installed between the antenna and the receiver, as mentioned above, the attenuation can be increased to the level at which interference in the receiver will be at a valid low level. This explains the effect of reducing interference in a receiving frequency band with the magnitude of the attenuation introduced by the attenuator. However, and useful (working) signal from the mobile station And 206 to the base station And 203, is also weakened by the amount of attenuation of the attenuator. This may cause the signal from the mobile station And 206 will have unacceptably small to receive his base station And 203.

The invention

The above and other problems are solved in the present invention by dynamically control as a weakening in the base station receiver And 203, and the transmit power of the mobile station And 206.

According to one aspect of the invention, it is proposed receiver, used to receive communication signals from a transmitter, which is then attenuated in the receiver. Next is the measurement of the signal level. The measured value of signal power of the fortress. The management tool weakening dynamically controls the degree of attenuation of the received signal. As a means of controlling transmit power generates a control signal power, which shall be forwarded to the transmitter. The transmitter uses adopted them signal power control to regulate the power level of communication signals transmitted them to the receiver. As a management tool weakening and control parameters of the transmitter is controlled respectively by the weakening of the receiver and the transmit power level in order to optimize the system performance.

In accordance with another aspect of the present invention, the attenuation in the receiver and the transmitter power level is regulated so that the attenuated signal did not go beyond the dynamic range of the receiver. This can be useful, for example, if the design is not very expensive receivers with reduced dynamic range that can be compensated by appropriate adjustment of the attenuation of the receiver and the power level in transmission mode.

In accordance with another aspect of the present invention, the attenuation in the receiver is adjusted so that the sensitivity of the time the transmitter power level is adjusted to a communication signal that has passed through the attenuator, remained within the dynamic range of the receiver.

Another feature of the present invention is the possibility of combining attenuator with an antenna having a dynamically adjustable gain (gain).

And another aspect of the present invention is that the dynamic adjustment of the attenuation in the receiver and the power level in transmission mode is used in a system in which multiple receivers are connected to a common antenna through a multi-channel splitter. In one embodiment, the implementation between the common antenna and multi-channel splitter has shared attenuator. In another implementation, each receiver has a means of weakening accept them communication signals.

Brief description of drawings

These and other aspects of the present invention will be explained in the subsequent detailed description with reference to the accompanying drawings which show the following: Fig. 1 is a graph showing the dependence of the dynamic range of the receiver and the magnitude of attenuation of the signals of Fig. 2 illustrates the situation when the small cell network to the mobile station swese the present invention to dynamically control the attenuation in the receiver and the transmitter power; in Fig. 4 is a block diagram of a device with multiple receivers connected to a single antenna in accordance with another variant of realization of the invention; Fig. 5 is a block diagram of another version of the invention is used to separate the attenuation in the system with multiple receivers connected to a common antenna through a multichannel splitter of Fig. 6 is a block diagram of an alternative implementation of the invention in which the antenna and the tunable attenuator combined into a common unit.

Detailed description of the invention

In Fig. 3 shows a mobile communication system including the present invention. Blocks to the right of the dash-dotted line 301 refer to the mobile station, and the blocks to the left of the line 301 to the base station.

Signals received by the base station through an antenna (not shown) are input signals for dynamically adjustable attenuator 302. With the attenuator output signal 302 is input to the measurement of the intensity (power) of the signal 303, and the output of this circuit 303 is connected to the inputs of the control circuit weakening 304 and circuit power control 305 of the mobile station. The control circuit weakening 304 is connected to the attenuator 302 for controlling step is the intention of 305 signal intensity to the signal, which is sent to the control circuit 306 power of the mobile station, where this signal adjusts the power level radiated by the transmitter of the mobile station. In one of the preferred variants of realization of the present invention the function of measuring the intensity of the signal and power control are implemented in accordance with the standards of the underlying Global System for Mobile communications (GSM) of the European Institute of Standards liaison (ETSI), which is used here as reference material. In particular, in the GSM recommendations 05.08 in sections 8.1.2. and 8.1.3 describes procedures for the measurement of the intensity signals. In sections 3.2 - 4.7 and section 4.1 GSM recommendations 05.05 describes the power control on the radio. In more detail below describes the control functions of the control circuit weakening 304 and circuit power control 305 mobile station.

One of the functions of the system dynamic control shown in Fig. 3, is to compensate for changes in the intensity of the signal received by the base station 201 (see Fig. 2), which occur when moving mobile station 205 within a large cell network 202. If the radiation power of the mobile station 205 post the remote mobile station 205 and the base station 201. Conversely, if the mobile station 205 is approaching the base station 201, the intensity of the received signal increases, but again, while respecting the fact that the level of radiation power of the mobile station is kept constant.

The present invention also effects compensated as follows. When the mobile station 205 is located near the border of the cell 202, the power control 305 mobile station, detecting a decrease in the intensity of the received signal, transmits a signal instructing the mobile station 205 to transmit at a higher power level. Due to the large loss of signal, which take place at his passing distances between stations, the received signal may be on the base station 201 of the very low intensity and may be close to the sensitivity threshold of the receiver.

When the mobile station 205 is moving toward the base station 201, the power taken this base station signal is increased. This is detected by the control circuit power transmission 305 mobile station, which responds by sending a signal to the mobile station 205, causing the decrease of transmitted power to the to achieve the mobile station 205 to the base station 201 to some current mobile station 205 will start to operate at the minimum possible level of radiated power. Then, while continuing the convergence of these two stations, the received signal strength starts to increase and, after some time, will become unacceptably large. In other words, despite the fact that the mobile station 205 is transmitting at the minimum possible power level, its proximity to the base station 201 lead to exceeding the intensity of the received signal above the level of saturation of the receiver.

This problem is solved in this invention by using the control circuit weakening 304 that detects the received signal with unacceptably high intensity and grants attenuator 302 command to increase the amount of insertion attenuation. In the result, the upper limit of the allowable signal level (i.e., saturation) increases and the problem associated with a high level signal, is solved.

Another problem which is solved by the present invention, refers to the situation described above, when the small cell 204 is located inside or near a large cell 202. However, as mentioned earlier, in the base station receiver And 203 interference caused by the mobile station 205, which is trying to send intended for the base station 201 may bitlbee with the present invention the circuit of the power control 305 mobile station detects a high level of interference, manifested in digital communication systems, such as increasing the frequency of error bits, then this scheme specifies the following order of work. The control circuit weakening 304 instructs the attenuator 302 to increase the degree of weakening until then, until the hum 110 is not reduced (see Fig. 1) sufficiently, perhaps even to a level below the threshold sensitivity of the receiver 105. However, in the useful and the carrier signal is also subjected to attenuation. For its compensation scheme power control 305 mobile station sends a signal to the control circuit power of the mobile station 306 And 206, prescriptive increase transmit power up until the intensity received by the signal receiver carrier frequency III (see Fig. 1) does not exceed the threshold sensitivity of the receiver 105. Thus the intensity of the useful signal is maintained constant at a level above the threshold level while suppressing interference.

Specialists in the art should be understood that the above procedure may be slightly different, namely from the circuit power control 305 mobile station may be sent a signal to the mobile station And 206 with a team of Uwe is tanzia signal, and to reduce as a result of this frequency error bits. After that, the control circuit degree of weakening 304 could, in response, to increase the attenuation of the received signal in order to reduce its intensity to the desired level.

A feature of one of the variants of realization of the present invention is that dynamic control of attenuation performed by the circuit 304, combined with the process of managing power of a mobile station in the transmission mode that is a function of circuit 305, and the power of the transmitter is determined on the basis of analysis of the quality of the received signal. Thanks to this combination of these two functions, it becomes possible to prevent unnecessary attenuation of the useful signal when the interference is low. This gives the advantage that the radiation power of the mobile station is maintained at a minimum level, and this is very important in many cases the use of mobile communication. In one of the preferred variants of realization of the present invention the process of managing power of a mobile station, in which the quality of the received signal is used to determine the power transfer mode, is carried out as described in the Chi in the radio system", the authors Almgren and others, filed may 14, 1993, owned by the same applicant as in the present invention.

The base station often contain multiple receivers connected to the same receiving antenna. In such cases, the means of weakening signals must be properly separated. The following describes one embodiment of the implementation of the present invention with reference to Fig. 4 and 5 having the above-mentioned feature.

In Fig. 4 shows several receivers 403 connected to a single antenna 401 via the receiver multi-coupler 402, which is made in the form of a broadband amplifier, receiving a broadband signal and having many narrow-band signal outputs. In each of the receivers 403 may be implemented with the present invention in the amount described above with reference to Fig. 3. However, the receiver-splitter 402 may be in the saturation state (locking), due to the strong signals at its input from the antenna 401. In this case, it is obvious that any weakening in a separate receivers 403 is not possible to avoid this overhead. To address this problem, the receiver splitter 402 shall be designed for more vyskytla 402 shown in Fig. 5. Here the means of weakening separated in order to choose the optimal attenuation in the signal path, both before and after receiver hub 402.

In Fig. 5 shows one of the N receivers 503. Although the following description refers only to one such receiver, it is quite clear that it applies to any of the N receivers 503. Each of the receivers 503 contains the control scheme described above with reference to Fig. 3. In addition, the output power measurement signal 303 of each receiver 503 is connected to the input of the control circuit weakening 504 in the input stages of the base station.

The signal characterizing the magnitude of decrease in the corresponding receiver 503, the output of the circuit 505 controls the weakening 505 in the base station receiver is fed to the input circuit 504, the management of the weakening in the input stages of the base station. Circuit 504 combines all input signals from the respective other receivers 503 to determine the actual intensity of the signal at the output of the attenuator 506 input stages. These input signals 504 can be, for example, just average. There are other methods to determine the actual intensity of the signal at the output of the attenuator 506 input stages.

Otherwise, the regulation is performed as described above with reference to Fig. 3, i.e., each separate line of communication between the base station and the mobile station is controlled so as to ensure an optimum balance of power level and signal quality.

In Fig. 6 shows alternative is CA between these two options is what in the variant according to Fig. 6 tunable attenuator is replaced by device "antenna/attenuator" 602 representing the antenna with adjustable gain (ratio), for example, phased array airborne early warning antenna grill with electronic regulation.

The other elements shown in Fig. 6, are similar to elements previously described with reference to Fig. 3, and does not require further detailed description.

The introduction of adjustable attenuation directly in the antenna device provides the advantage that the intermodulation products (1M), generated in the antenna are attenuated by an amount approximately equal to the set attenuation built in the nth degree, where n is the order of intermodulation products. This opens up the possibility of creating such a combination receiver antenna, which will be very resistant to external radio-technical factors, such as mentioned above, interference, including a very high level signals (causing saturation and locking of the cascades receive path) and the intermodulation products. In addition, the creation of the receiver can compensate for the influence of signals and a high level of intermodulation products can expand R interference from matching channels and distortions in the distribution channel.

The present invention has been described on the example of several specific implementation options. However, as should be understood by experts in the art, this invention can be embodied not only in the described embodiments, therefore, the scope of claims of the authors of the invention is not limited to the above description, but is defined by the following claims.

1. Device for use in a communication system containing a receiver intended for receiving the communication signal transmitted by the transmitter, the transmitter including means to control the transmitted power, responsive to the received signal power control, to control the power level at which the transmitter transmits the communication signal, characterized in that it contains a measure to generate a signal intensity measurements of the signal based on a received communication signal, means for attenuating the received signal due to the amount of attenuation is determined dynamically by the control signal, for forming a weakened signal, intended for submission as an input signal to the receiver, the management tool weakening, coupled with the measuring tool and the tool is I supply the control signal to a means of weakening, and the first management tool capacity, coupled with a measurement tool to use for measuring signal intensity of the signal when generating a signal to control power supplied to the transmitter, the management tool weakening and the first tool power control coordinated with each other to dynamically control respectively the degree of attenuation and the level of transmitted power for substantial optimization of the characteristics of the communication system, and a management tool weakening dynamically adjusts the amount of attenuation for the formation of an effective dynamic range for receiving only signals having a signal strength exceeding the level of intensity of the interference signal, and the first management tool power at the same time regulates the level of transmitted power, causing the transmitter to form an adjustable connection signal within the effective dynamic range of the receiver.

2. The device under item 1, characterized in that the management tool weakening and the first tool power control adjust accordingly the degree of attenuation and the level of transmitted power in southweste high frequency bit error indicates the presence of signal interference.

3. The device under item 1, characterized in that the means of weakening includes an antenna having a dynamically adjustable gain antenna.

4. Device for use in a communication system with multiple receivers connected to a common antenna through a multichannel splitter, wherein each receiver is configured to communication with the corresponding one of the multiple transmitters, each transmitter includes means to control the power of the transmitter to control the transmit power level in accordance with the received one of many signals, power control, and the device contains a means of weakening the input stage, connected to a common antenna, for receiving a variety of communication signals transmitted by multiple transmitters to attenuate many of the communication signals on the extinction of the input stage, dynamically defined by the first control signal, and a means of weakening the input stage has an output for supplying a weakened set of received communication signals mnogochleny splitter, many of the supporting devices, each of which contains an input for receiving a corresponding one of mnojestve signal intensity for forming, for the corresponding one of the many weak communication signals, the first signal intensity measurements of the signal and the first control output coupled with the first means for measuring the intensity signal for use of the first measuring signal intensity of the signal for the formation of one of the many signals power control, which is intended for transmission to the appropriate one of the multiple transmitters, and means to control the attenuation of the input stage having an input connected to receive the first signal intensity measurements from each of a variety of assistive devices, and output, coupled with means for attenuating the input stage to use each of the signals of the first means of measuring the intensity of the signal for generating the first control signal and for supplying the first control signal to a means of weakening the input stage, moreover, the management tool weakening of the input stage and the first control means of each of the multiple auxiliary devices dynamically controlled respectively by the extinction of the input stage and the level of transmit power of each of the multiple transmitters to substantially the Board weakening of the input stage and the first control each of the multiple auxiliary devices dynamically control respectively the degree of attenuation of the input stage and the level of transmit power of each of the multiple transmitters to maintain a weak signal within the dynamic range of each of the multiple receivers.

6. The device according to p. 4, characterized in that the management tool weakening of the input stage dynamically controls the degree of attenuation of the input stage of the receiver for forming, for each of multiple receivers, the effective dynamic range for receiving only signals having a signal strength that exceeds the level of intensity of the interference signal, the first management tool capacity of each of the auxiliary devices at the same time dynamically controls the level of transmit power of a corresponding one of the multiple transmitters, so that the corresponding one of the multiple transmitters were developed adjustable communication signal within the effective dynamic range of the corresponding one of the receivers.

7. The device according to p. 6, characterized in that the management tool weakening of the input stage and the first management tool capacity of each of the multiple auxiliary devices controlled respectively by the degree of attenuation of the input stage and the level of transmit power of each of the multiple transmitters to substantially optimize the performance of a communication system in accordance with the frequency shows the effect of the error bit indicates the presence of signal interference.

8. The device according to p. 4, characterized in that the means of weakening the input stage includes an antenna with a dynamically adjustable gain.

9. Device for use in a communication system with multiple receivers connected to a common antenna through a multichannel splitter receiver, and each receiver is configured to communication with the corresponding one of the multiple transmitters, each transmitter includes means to control the transmitted power to control the transmit power level in response to the received one of many signals power control, characterized in that it comprises a means of weakening the input stage, connected to a common antenna for receiving multiple communication signals transmitted by multiple transmitters to attenuate many of the communication signals on the extinction of the input stage, defined dynamically by the first control signal, and a means of weakening the input stage has an output for supplying a weakened set of received signals due to multi-channel splitter receiver, many of the supporting devices, each of which contains an input for receiving sootvetstvuyushchego weakening further weakening of one of the many weak received signals at a different value of attenuation, dynamically defined by the respective second control signal, and for issuing additional weak communication signal, the first means of measuring the intensity of the signal for forming, for additional weak communication signal, the first signal intensity measurements of the signal and the first control output connected to the first means of measuring the intensity signal for use of the first measuring signal intensity signal to generate one of a variety of control signals power intended for transmission to a corresponding one of multiple transmitters and a second management tool weakening, with the input connected to the first means for measuring the intensity of the signal, and an output connected to the second means of weakening, to use the first measuring signal intensity signal to generate the second control signal and for supplying a second control signal to the second means of weakening, and the management tool weakening input stage having an input connected to receive the first signal, measuring the signal strength from each of the multiple auxiliary devices, and the output connected to sredstv, moreover, the management tool weakening of the input stage, the first management tool capacity of each of a variety of assistive devices and the second management tool weakening each of the multiple auxiliary devices dynamically control respectively the degree of attenuation of the input stage, the power level of each of the multiple transmitters and additional degree of attenuation of the second means of attenuation of each of the auxiliary devices to substantially optimize the performance of communication systems.

10. The device according to p. 9, characterized in that the means of weakening the input stage, the first management tool capacity of each of a variety of assistive devices and the second management tool weakening each of the multiple auxiliary devices dynamically controlled respectively by the extinction of the input stage, the transmit power level of each of the multiple transmitters, and the amount of additional attenuation of the second means of attenuation of each of the auxiliary devices to maintain additional weak communication signal within the dynamic range of the corresponding one of the multiple receivers.

12. The device according to p. 11, wherein the management tool weakening of the input stage, the second management tool weakening each of the multiple auxiliary devices and the first management tool capacity of each of the multiple auxiliary devices controlled respectively by the extinction of the input stage, an additional amount of attenuation of the second means of weakening katogooria characteristics of the communication system in accordance with the frequency of a bit error in the received communication signals, exceeding the preset value, and a high frequency of occurrence of errors for bits indicates the presence of signal interference.

13. The device according to p. 9, characterized in that the means of weakening the input stage contains an antenna with a dynamically adjustable gain.

14. The method of operation of a communication system containing a receiver for receiving the communication signal transmitted by the transmitter, the transmitter including means to control the power of the transmitter, responsive to the received signal power control to control the power level at which the transmitter transmits the communication signal, and the receiver includes a means of weakening for attenuating a received communication signal on the value that is dynamically determined by the control signal, characterized in that it includes the stages at which the measured intensity of the received communication signal, dynamically adjust the amount of attenuation based on the measured intensity of the signal form the control signal power based on the measured signal intensity, and transmit the control signal power of the transmitter, and the stages of the dynamic regulation of the magnitude of attenuation and signal power control RMS is elicina attenuation and signal power control is also based on dynamic attenuation regulation in the receiver to form an effective dynamic range to only accept signals having a signal strength greater than the signal strength of the interference, and at the same time, on the regulation of the power level of the transmitter so that it formed the adjustable communication signal within the effective dynamic range of the receiver.

15. The device under item 1, characterized in that the management tool weakening and the first management tool with the capacity to interact simultaneous dynamic control respectively the magnitude of the attenuation and the level of transmitted power to substantially optimize the performance of communication systems.

16. The device according to p. 4, characterized in that the management tool weakening of the input stage and the set of first controls the power to interact and simultaneous dynamic control, respectively, the extinction of the input stage and the level of transmit power of multiple transmitters to substantially optimize the performance of communication systems.

17. The device according to p. 9, characterized in that the management tool weakening of the input stage, the first management tool capacity of each of a variety of assistive devices and the second management tool okablowania respectively the magnitude of the attenuation in the input stage, the transmit power level of each of the multiple transmitters, and the amount of additional attenuation means weakening each auxiliary device to substantially optimize the performance of communication systems.

18. The method according to p. 14, characterized in that the stages of the dynamic regulation of the magnitude of attenuation and signal power control takes place simultaneously for dynamic optimization of characteristics of the communication system.

19. The method according to p. 14, characterized in that the stages of the dynamic regulation of the magnitude of attenuation and signal power control is carried out in accordance with the frequency of a bit error in the received communication signal exceeding a preset value, and a higher frequency of occurrence of errors for bits indicates the presence of signal interference.

 

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