RU2260914C2 - Simplified procedures for testing quality coefficient bit - Google Patents

Abstract

FIELD: communications engineering.

SUBSTANCE: method includes configuring a receiver with possible waiting for receipt of communication channel at full data transfer speed, and signal from transmitter is sent to receiver. Signal is sent via communication channel with data transfer speed, different from full speed of data transfer, and at level of power for receipt at full data transfer speed. As a result receiver can not receiver communication channel at full data transfer speed. In receiver relation of received signal to noise is determined. Value of quality coefficient bit is determined ion basis of certain relation of signal to noise. Determined value of quality coefficient bit is sent to transmitter.

EFFECT: higher efficiency.

3 cl, 3 dwg, 7 tbl

Description

FIELD OF THE INVENTION

The disclosed embodiments relate to the field of communication.

State of the art

A radio communication system in accordance with the CDMA (CDMA) method (CDMA) is disclosed and described in various standards published by the Telecommunications Industry Association (TIA). A person of ordinary skill in the art is familiar with such standards. Such standards are commonly known as TIA / EIA / IS-2000, TIA / EIA / 95A / B and WCDMA (WCDMA (Broadband Code Division Multiple Access) among several others. A copy of the standards can be obtained by accessing the World Wide Web address: http://www.cdg.org or by mail to TIA, Department of Standards and Technology, 2500 Wilson Boulevard, Arlington, USA. The specification, usually identified as the WCDMA specification, can be obtained by contacting the 3GPP support office , 650 Route des Licioless-Sophia Antipolis, Valbonne-France. Part of one of these standards relates sitsya to implement testing devices operating within the requirements that are specified in each standard. Various disclosed embodiments provide simplified and detailed procedure for testing the quality indicator bits (BOD) in the part of such standards.

To this end, as well as with others, there is a need for an improved communication system.

SUMMARY OF THE INVENTION

In a code-division multiple access communication system, a method and apparatus for efficiently testing the operational nature of a change in a quality indicator bit are proposed. The method and device includes configuring a receiver with the expectation of receiving a communication channel with a full data rate and transmitting a signal from the transmitter to the receiver. The signal is carried over a communication channel with a data rate different from the full data rate and at a power level for receiving at the full data rate. As a result, the receiver does not receive a communication channel with a full data rate. The ratio of the received signal to noise at the receiver is determined. The quality indicator bit value is determined based on a specific signal to noise ratio. A certain value of the quality indicator bit is transmitted to the transmitter.

Brief Description of the Drawings

Signs, objectives and advantages of the present invention will become more clear from the detailed description below, taken in conjunction with the drawings, in which the same reference characters are respectively indicated throughout all the drawings and in which:

1 illustrates a communication system configured to operate in accordance with various embodiments of the invention;

2 illustrates a receiver of a communication system for operation in a mobile station and a base station, configured to operate in accordance with various embodiments of the invention; and

3 illustrates a block diagram for controlling a power level of a communication channel between a mobile station and a base station in accordance with various embodiments of the invention.

Detailed Description of Preferred Embodiment (s)

Generally speaking, new and improved method and apparatus are proposed for efficiently performing a testing process at a transmitter and a receiver in a code division multiple access communication system. One or more exemplary embodiments described herein are provided in the context of a digital radio data system. Although use in this context is advantageous, other embodiments of the invention may be contained in other environments or configurations. In general, the various systems described herein may be configured using software controlled processors, integrated circuits, or discrete logic circuits. Data, instructions, commands, information, signals, symbols and elementary signals that may be mentioned throughout the application are mainly represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or a combination thereof. In addition, the blocks depicted in each flowchart may represent hardware or process steps.

FIG. 1 illustrates a general block diagram of a communication system 100 configured to operate in accordance with any of the standards of a code division multiple access (CDMA) communication system and in accordance with various embodiments. Typically, the communication system 100 includes a base station (BS) 101, which provides communication lines between a number of mobile stations, such as mobile stations 102-104, and between mobile stations 102-104 and a wired network 105. The BS 101 may include a number components, such as a mobile station controller, base station controller, and radio frequency transceiver. For simplicity, such components are not shown. BS 101 may also communicate with other base stations (not shown). BS 101 communicates with each mobile station 102-104 through a forward link (base station-mobile station). The forward link may be supported by the forward link signal transmitted from the BS 101. The forward link signals addressed to multiple mobile stations 102-104 may be added to form the forward link signal 106. Each of the mobile stations 102-104 receiving the forward link signal 106 decodes the forward link signal 106 to extract information that is addressed to its user. At the receiving end, the receiver may consider as interference the portion of the received forward link signal 106 addressed to others.

Mobile stations 102-104 communicate with BS 101 through a corresponding reverse link (mobile station — base station). Each reverse link is supported by a reverse link signal, such as reverse link signals 107-109 for respective mobile stations 102-104. The BS 101 may also transmit predetermined data bit sequences in the pilot channel through the forward link to all mobile stations to help each mobile station decode the forward link signal 106. Each of the mobile stations 102-104 may transmit the pilot channel to the BS 101. The pilot channel transmitted from the mobile station may be used to decode the information carried by the reverse link signal transmitted from the same mobile station. The use and operation of the pilot signal is well known. A transmitter and a receiver for communicating via the forward and reverse links are included in each mobile station 102-104 and BS 101.

2 illustrates a block diagram of a receiver 200 used for processing CDMA signals. The receiver 200 demodulates the received signal in order to extract information carried by the received signal. Receive samples (Rx) are stored in RAM 204. Receive samples are generated using a radio frequency / intermediate frequency (RF / IF) system 290 and an antenna system 292. The antenna system 292 receives an RF signal and transmits an RF signal to the RF / IF system 290. The RF / IF system 290 may be any conventional RF / IF receiver. Received RF signals are filtered, downconverted, and digitized to form RX samples in the main frequency band. Samples are supplied to the demultiplexer 202. The output signal of the demultiplexer 202 is supplied to the search device 206 and the finger elements 208 (tap elements). The control device 210 is connected to them. Combiner 212 connects decoder 214 to finger elements 208. The control device 210 may be a microprocessor controlled by software, and may be located in the same integrated circuit or in a separate integrated circuit.

During operation, receive samples are supplied to demultiplexer 202. Demultiplexer 202 provides samples to search device 206 and finger elements 208. The control device 210 configures the finger elements 208 to demodulate the received signal with different time shifts based on the search results from the search device 206. The demodulation results are combined and transmitted to the decoder 214. The decoder 214 decodes the data and outputs the decoded data.

Typically, a search device 206 may use incoherent demodulation of a pilot channel to search for a synchronization hypothesis and phase shifts corresponding to different transmission sources and multiple paths (multipath paths) for search. Demodulation performed using the elements of the 208 finger can be performed through coherent demodulation of other channels, such as the control channel and the traffic channel. Information extracted by the search device 206 by demodulating the pilot channel can be used in the finger elements 208 to demodulate other channels. Search device 206 and other finger elements 208 can provide both a search for the pilot channel and demodulation of the control channel and the traffic channel. Demodulation and search can be performed with various time shifts. The demodulation results may be combined in combiner 212 before decoding the data transmitted on each channel. Channel compression is performed by multiplying the received samples by the complex conjugate of the PN sequence (pseudo noise) and the assigned Walsh function with one synchronization and digital filtering hypothesis obtained as a result of the samples often using the integration and accumulation scheme (not shown). Such a method is well known in the art. Receiver 200 may be used in BS 101 and mobile stations 102-104 to decode information, respectively, in forward link and reverse link signals. BS 101 may use multiple receivers 200 to decode information transmitted from multiple mobile stations at the same time.

Receiver 200 may also perform interference cancellation through a correlation process. Received samples after being read from RAM 204 are transmitted through a correlation process for each received signal. The correlation process can be jointly described as the operation of the search device 206, the finger element 208 and the combiner 212. Since the received samples contain samples of signals transmitted from more than one transmission source, the correlation process can be repeated for each received signal. The correlation process for each received signal may be unique, since each signal may require different correlation parameters as the parameters found in the operations of the search device 206, finger element 208 and combiner 212. Each signal may include a traffic channel and a pilot channel. The PN sequence assigned to the traffic channel and the pilot channel carried by each signal may be different. The correlation process may include channel estimation, which includes estimating channel fading characteristics based on the result of correlation with the pilot channel. Channel estimation information is used to correlate with the traffic channel. Each traffic channel is then decoded.

The result from each correlation process can pass through the decoding process in the decoder 214. If the transmitted channel is encoded by the convolutional encoding process, the decoding step 214 is performed in accordance with the convolutional code used. If the transmitted channel is encoded by the turbo coding process, decoding step 214 is performed in accordance with the used turbo code.

Each signal can be decoded so as to provide enough information as to whether a passage indicator is generated for each control by a cyclic redundancy code (CRC) associated with each transmitted data frame. The operation and use of the CRC in a communication system is well known. If the CRC is passed, the decoded result of the channel associated with the passed CRC can be transmitted for an additional receive operation. The quality indicator bit (BOD) can also be used to indicate signal quality. The BOD can be transmitted via a reverse link power control subchannel to indicate signal quality over a dedicated forward link control channel (CMS). When the main channel of the forward link is present, the BOD is set to indicate the same as the bit of the erase indicator. The erasure indicator bit may indicate an erased channel frame and / or lack of transmission of a channel frame.

Signals received by BS 101 may be input to receiver 200. Antenna system 292 and RF / IF system 290 receive signals from mobile stations in order to sample received signals. Received samples can be stored in RAM 204. Receiver 200 may include a number of search devices 206, a number of finger elements 208, a number of combiners 21, and a number of decoders 214 to simultaneously perform a correlation process and a decoding process for all signals received from various mobile stations. However, only one antenna system 292 and an RF / IF system 290 may be needed.

Each time the correlation process begins, the search device 206 and the finger element 208 can be restarted to determine incoherent demodulation of the pilot channel in order to verify synchronization hypotheses and phase shifts. The search device 206 or the finger element 208 or the search device 206 and the finger element 208 in combination can determine the signal to noise ratio (S / N) for each received signal. The ratio Eb / I in meaning can be the same as the ratio S / N. The Eb / I ratio is a measure of signal energy relative to interference per unit of data symbol or data bit. Therefore, S / N and Eb / I can be used interchangeably in some aspects. Interference (I) can usually be defined as the spectral density of the interference power and thermal noise.

In order to control interference, the system controls the level of the signal transmitted from each transmission source, or the data rate of the communication line, or both. Typically, the MS determines the necessary reverse link power level to support both the traffic channel and the pilot channel. Various power control schemes are known for controlling the power levels of signals transmitted from an MS in a communication system. The output power level of each PS is controlled by two independent control loops, an open loop (without feedback) and a closed loop (with feedback). Power control using an open circuit is based on the need for each MS to maintain an adequate communication line with the BS. Therefore, MS closer to the BS requires less power than a more remote PS. A strong reception signal in the MS indicates less propagation loss between the MS and the BS and therefore requires a lower reverse link transmit power level. When controlling power using an open loop, the MS sets the transmit power level of the reverse link based on independent S / N measurements of at least one received channel, such as a pilot channel, a paging channel, a synchronization channel, and a traffic channel. The MS can perform an independent measurement before setting the power level of the reverse link.

FIG. 3 illustrates a flowchart 300 of an example closed loop power control method. The operation of the closed loop power control method 300 begins when the MS in the communication system 100 captures a forward link traffic channel. After the initial access attempt using the MS, the MS sets the initial power level of the reverse link channel. The initial setting of the power level in the reverse link is then adjusted during the communication line by controlling the 300 power level using a closed loop. Closed loop power control 300 operates with faster response times than open loop control. Closed-loop power control 300 provides correction of open-loop power control. Closed loop power control works in conjunction with open loop control during a traffic channel link to provide reverse link power control with a large dynamic range.

In order to control the power level of the reverse link signal of the mobile station through the closed loop 300, the BS 101, in step 301, measures the signal-to-noise ratio (S / N) of the reverse link signal transmitted from the mobile station. The measured S / N is compared with the S / P installation point at step 302. The measured S / P can be in the form of Eb / I, which is the ratio of bit energy to interference, and therefore, the installation point can be in the same form. The installation point is selected for the mobile station. The installation point may initially be based on the installation of power using an open circuit through a mobile station.

If the measured C / P is greater than the installation point, at step 303, the BS 101 instructs the mobile station to lower the power level of its reverse link signal, for example, by 1 decibel. When the measured S / N is greater than the installation point, this indicates that the mobile station is transmitting on the reverse link with a signal power level greater than necessary to maintain adequate reverse link communications. As a result, the mobile station is instructed to reduce the power level of its reverse link signal to reduce overall system interference. If the measured C / P is less than the installation point, at step 304, the BS 101 instructs the mobile station to increase the power level of its reverse link signal, for example, by 1 decibel. When the measured S / N is less than the installation point, this indicates that the mobile station is transmitting on the reverse link with a signal power level lower than necessary to maintain adequate reverse link communications. As a result of the increase in power level, the mobile station may be able to overcome the level of interference and provide adequate reverse link communication.

The operations performed in steps 302-304 may be referred to as power control using an internal circuit. Power control using the internal circuit supports (S / R) the reverse link in BS 101 as close as possible to its target threshold, which is provided by the installation point. The target S / P ratio is based on the installation point selected for the mobile station. An increase in power or a decrease in power can be performed several times during a time frame. One time frame can be divided into 16 power control groups. Each power control group consists of several data symbols. The command to increase or decrease power can be transmitted 16 times per frame. If one data frame is not received at step 305, the power control loop 300 continues to measure the S / N ratio of the reverse link signal for the next power control group at step 301. The process is repeated at steps 302-304 until at least one the data frame will not be received from the mobile station.

One installation or target point may not be satisfactory for all conditions. Therefore, the installation point used in step 302 may also vary depending on the desired reverse link frame error rate. If one data frame is received at step 305, a new C / P setup point can be calculated at step 306. The new setup point becomes the new C / P target for the mobile station. A new installation point can be based on a number of factors, including the frame error rate. For example, if the frame error rate is above a predetermined level, indicating an unacceptable frame error rate, the installation point may be raised to a higher level. When the installation point is raised to a higher level, the mobile station as a result increases its transmit power level on the reverse link by comparing at step 302 and the command to increase power at step 304. If the frame error rate is lower than the specified level, indicating an acceptable frame error rate, the installation point can be lowered to a lower level. When the installation point is lowered to a lower level, the mobile station as a result decreases its transmit power level on the reverse link by comparing at step 302 and the power reduction command at step 303. The operations performed at steps 305-306, repeating in a cycle from step 306 to step 303, to indicate a new installation point, and repeating in a cycle to step 301 to measure S / P of new frames can be considered as open loop operations. Open loop power control can control once per frame, and closed loop power control can control once per power control group. One frame and one power control group can be equal, respectively, to 20 and 1.25 ms in duration.

The system may also use a forward link power control circuit to reduce interference. The PS contacts periodically with the BS about the quality of speech and data. Measurements of the frame error rate and quality are reported to the BS by means of a power measurement report message. The message contains the number of frames received with errors on the forward link during a certain interval. The signal strength of the forward link signal is adjusted based on the number of frame errors. Since such quality measurement feedback is based on the frame error rate, such a BS-PS forward link power measurement mode is slower than reverse link power control. For a quick response, the reverse link erasure bit can be used to inform the BS whether the previous frame was received with or without errors. The increase in channel power can be continuously adjusted while monitoring the message or the erase bit as a way to control the forward link power level.

For data transmission, the forward link signal can be transmitted to the MS with a constant power level, while at the same time adjusting the effective forward link data rate for the MS. Adjusting the forward data rate from the point of view of the entire system is a form of interference control. Note that forward link power control is typically intended to control interference in a service area and / or to share limited communication resources. When the measurement of feedback quality indicates poor reception, the data rate can be reduced, while maintaining a constant power level to overcome the effect of interference. The data rate may also be reduced to allow other mobile stations to receive forward link transmission at a higher data rate.

In addition to the open loop and closed loop power control circuits, the MS can adjust the output power level using the code channel attributes defined by the standard. The MS can set the output power of the access channel header, the access channel data, and the common reverse link control channel data with respect to the output power level of the reverse link pilot channel. The reverse link pilot channel channel power level is set when power is controlled using an open loop and power is controlled using a closed loop. The MS maintains a power level relationship between the code channel power level and the reverse link pilot channel power level. The ratio can be determined using the data rate used in the code channel. Typically, a table provides values for a relationship at various data rates. The ratio usually increases for higher data rates. A ratio equal to one, or a ratio less than one, may also be possible. With a ratio of unity, the power level of the pilot channel that is set by the power control loop 300 is equal to the power level of the code channel. During data transmission over a traffic channel, the data rate and the power level of the traffic channel can be adjusted. The power level may be selected based on the relative power of the reverse link pilot. When an acceptable data rate is selected, the corresponding channel gain relative to the power level of the reverse link pilot signal is used to set the power level of the traffic channel.

In data mode, a BS can provide communication links to a large number of MSs with different data rates. For example, one MS in a connected state on a forward link can receive data at a low data rate, and another MS can receive at a high data rate. On the reverse link, the BS can receive a number of reverse link signals from various MSs. Based on an independent measurement, the MS can decide and request the required data rate from the BS. The required data rate on the forward link can be transmitted to the BS through the data rate control channel (DRC). BS is trying to provide data transmission in a straight line with the desired data rate. On the reverse link, the MS can autonomously select the data rate of the reverse link from a number of possible data rates of the reverse link. The selected data rate may be transmitted to the BS via the reverse link rate indicator channel. Each MS can also be limited by a given level of service. The level of service may limit the maximum available data rate on the forward and / or reverse links. In addition, data transmission may not be continuous in a certain sense, when voice data may be transmitted. The receiver can receive data packets at various intervals. The interval for another receiver may be different. For example, a receiver may receive data randomly, while another receiver may receive data packets for short periods of time.

Data transmission with high data rates requires a higher power level of the transmit / receive signal than with low data rates. The forward and reverse links can have processes of the same data rate in the case of voice messages. The data rates of the forward and reverse links can be limited by low data rates, since the frequency spectrum of voice information is limited. Possible speech data rates are well known and described in the standards of Code Division Multiple Access (CDMA) communication systems, such as IS-95, IS-2000 and WDMKR. However, for data transmissions, the forward and reverse links may not have the same data rates. For example, a PS may retrieve a large data file from a database. In this case, the forward link communication is mainly engaged in transmitting data packets. The data transfer speed on the forward link can reach 2.5 Mbit per second in data transfer mode. The forward link data rate may be based on a data rate request made by the MS. On the reverse link, the data transfer rate may be lower and may range from 4.8 to 153.6 Kbps.

Typically, in a communication system 100, in accordance with various embodiments, a communication channel operating cycle is determined, and a communication channel power level is controlled based on a specific operating cycle. Each transmission or communication channel may be in a temporary frame. For example, each time frame may be 20 ms in duration. The data rate of each time frame can range from 1250 to 14400 bits per second. As such, the number of bits in each frame may be different, depending on the data rate. A channel can be used to transmit user or signaling information during a call between the user and the recipient. A user may use a mobile station, such as mobile stations 102-104, for a call. Any of the mobile stations 102-104 may be a cell phone. The destination may be base station 101.

In accordance with an embodiment, the communication channel may be a dedicated control channel (QMS). The QMS channel can be used to transmit user and signaling information to support the call of traffic data between the user and the destination, such as mobile stations 102-104 and base station 101, respectively. The number of QMS frames transmitted over a period of time can be different , depending on use. As such, the time between transmission of QMS time frames during a call of traffic data may be different. For example, even if traffic data can be transmitted, frame transmission over a communication channel, such as a QMS, may not necessarily occur. In yet another situation, several time frames of a communication channel, such as a QMS, may be transmitted in a short period of time. Therefore, the duty cycle of transmitting frames of a communication channel, such as a QMS, may be different at different points in time.

The test procedure for a quality indicator bit (BOD) may contain three parts that may overlap. Various disclosed embodiments provide a simplified procedure. The nature of the change in the BOD for the specialized control channel of the forward communication line can be performed on the specialized control channel of the direct communication line for mobile stations that support a channel configuration that does not contain the main channel of the direct communication line. Closed-loop power control of the forward link traffic channel at the base station will be valid during this test. When working with FPC_MODE mode equal to '100', and with a channel configuration that does not contain the main channel of the forward communication line, the mobile station constantly monitors the specialized control channel of the direct communication line and sends a BPC. When a frame is active, the quality indicator bit has the same meaning as the error indicator bit (BPO). When the frame is not active, the BOD indicates the quality of the channel. In certain tests, the process verifies that the mobile station is sending a BOD with the same value as the BPO for active frames. In certain tests, the process verifies that the mobile station sends the BOD according to the quality of the received signal for inactive frames with only the power control bit (i.e., without data).

Measurements may include:

The connection of the generator ABGSh (additive white Gaussian noise) with the antenna connector of the mobile station, as shown in figure 1 of the description.

For each class of the range that the mobile station supports, configuring the mobile station with the ability to work in this class of range and perform steps 3 through 8.

If the mobile station supports demodulation of the radio configuration 3, 4, or 5, call setup using test mode 3 of the dedicated control channel and steps 5 through 8 are performed.

If the mobile station supports demodulation of the radio configuration 6, 7, 8, or 9, call setup using mode 7 (see 1.3) testing a dedicated control channel and performing steps 5 to 8.

Setting test parameters for tests 1, 3, 5, 7, 9, 11, and 13, as indicated in tables A.2.13.1-1 to A.2.13.1-7, and transmitting alternating good and bad 20 ms frames with data. Good frames are transmitted from a base station simulator at a speed of 9600 or 14400 bits per second. Bad frames are transmitted from the base station simulator in one of two ways: 1. At speeds of 1500 or 1800 bits per second, as in the main channel of the forward link in the same test radio configuration; or 2. At the same speed of 9600 or 14400 bits per second using a radio configuration different from the test configuration.

Checking the received BOD in the base station with respect to the corresponding frames received in the mobile station for at least 100 frames.

Setting test parameters for tests 2, 4, 6, 8, 10, 12, and 14, as indicated in Tables A.2.13.1-1 to A.2.13.1-7, and alternately turning on and off the frame transmission with power control bits only through a dedicated direct link channel.

Checking the received BOD bit at the base station for at least 100 frames.

The minimum standard for certain tests may include that the BOD result follows a transmitted frame pattern of alternating '0' and '1' for 'good' and 'bad' frames, respectively, with a confidence of 95%. In certain tests, the minimum standard for tests may include that the BOD result follows a transmitted frame pattern of alternating '0' and '1' to enable and disable frame transmission, respectively, with a confidence of 95%.

Those of ordinary skill in the art would further understand that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or a combination of both of another. In order to clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps are described above generally in terms of their functionality. Whether such functionality as hardware or software is implemented depends on the limitations of a particular application or design imposed on the entire system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The various illustrative logical blocks, modules, and circuits described in connection with the embodiments disclosed herein may be implemented or implemented using a general purpose processor, digital signal processor (DSP), specialized integrated circuits (SIS), a gate array programmable in operating conditions (VMPUE) or other programmable logic device, discrete logic element or transistor logic circuit, discrete elements of technical support, or any combination thereof an inception intended to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be implemented directly in hardware, in a software module executed by a processor, or in combination. The software module may reside in RAM memory, flash memory, ROM memory, EEPROM memory (electrically erasable and programmable ROM), registers, a hard disk, a removable disk, a CD, or other form of recording medium known in the art. An exemplary recording medium is connected to the processor so that the processor can read information from the recording medium and write information to the recording medium. In the alternative, the recording medium may be integrated in the processor. The processor and the recording medium may reside in the SIS. SIS may reside in a user terminal. In the alternative, the processor and the recording medium may reside as discrete elements in a user terminal.

The previous description of the preferred embodiments is provided to enable any person skilled in the art to use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the basic principles defined herein may be applied to other embodiments without using inventive ability. Therefore, it is not intended that the present invention be limited by the embodiments depicted in the present description, but rather should conform to the broadest framework consistent with the principles and new features disclosed in the present description.

Claims (16)

1. The method of determining the working nature of changes in the bits of the quality indicator in a multiple access communication system with code division multiplexing, which consists in the fact that a) configure the receiver with the expectation of receiving a communication channel with a full data rate, b) transmitting the signal from the transmitter to the receiver, the signal being transmitted over a communication channel with a data rate different from the full data rate and at a power level to receive the full data rate, c) carry out a reception failure at the receiver of a communication channel with a full data rate, d) determine in the receiver the ratio of the received signal to noise, e) determining the value of said bit of the quality indicator based on the determined signal-to-noise ratio, f) transmitting to the transmitter a certain value of said quality indicator bit. 2. The method according to claim 1, characterized in that steps (b) - (f) are further repeated. 3. The method according to claim 1, characterized in that it further determines the working nature of the change in the bit of the quality indicator based on the transmitted value of the bit of the quality indicator. 4. The method according to claim 1, characterized in that the determination of the working nature of the change in the bit of the quality indicator is intended to determine the nature of the change in the bit of the quality indicator in a specialized control channel of a direct communication line in a communication system. 5. The method according to claim 1, characterized in that the communication channel is a specialized channel of a direct communication line. 6. The method according to claim 1, characterized in that the receiver is connected to the mobile station, and the transmitter is connected to the base station in the communication system. 7. The method according to claim 1, characterized in that said full data rate is equal to one of the data rates of 9600 and 14400 bits per second, and said speed, different from the full speed, is equal to one of the data rates of 1500 and 1800 bits per give me a sec. 8. The method according to claim 1, characterized in that said power level for receiving at a full data rate is at a power level corresponding to the power level used in the power control subchannel. 9. A device for determining the nature of a change in a bit of a quality indicator in a code division multiple access communication system, comprising a receiver configured to wait for reception at full data rate, a first transmitter configured to transmit a signal to the receiver with a data rate excellent from the full data rate, and at the power level for receiving at the full data rate, the controller in the receiver, configured to detect the failure of reception at the receiver of said signal at a full transmission rate, the receiver together with the controller being further configured to determine the ratio of the received signal to noise in the receiver and determine the value of the said bit of the quality indicator based on the determined signal-to-noise ratio, a second transmitter configured to transmitting to the first transmitter the values of said bit of a quality indicator. 10. The device according to claim 9, characterized in that the said definition of the nature of the change of the mentioned bits of the quality indicator is intended to determine the nature of the change of the mentioned bits of the quality indicator in a specialized control channel of a direct communication line in a communication system. 11. The device according to claim 9, characterized in that the receiver is connected to the mobile station, the first transmitter is connected to the base station, and the second transmitter is connected to the mobile station in the communication system. 12. A method for verifying that a quality indicator bit is sent in accordance with the quality of the received signal, carried out in a communication system, which consists in connecting the base station and the additive white Gaussian noise (ABGS) with the antenna connector of the mobile station, for each class of range data rates supported by the mobile station, configure the mobile station with the ability to work in the supported class of the range of data rates and radio configurations, set the call using a specialized control channel and transmit alternating good and bad frames with data, moreover, good frames are transmitted from the base station with a data rate of 9600 or 14400 bits per second, and bad frames are transmitted from the base station in at least the first or second way, the first the method includes transmitting at speeds of 1500 or 1800 bits per second, as in the main channel of the forward link, and the second method includes transmitting at a speed of 9600 or 14400 bits per second using the rad configuration communications other than the configured test radio configuration. 13. The method according to p. 12, characterized in that it further check the received bit of the quality indicator in the base station relative to the corresponding frames received in the mobile station for at least 100 frames. 14. The method according to p. 12, characterized in that it further alternately turns the frame transmission with the power control bits on and off only through a dedicated forward link control channel. 15. The method according to p. 12, characterized in that it further awaits the receipt of the said bit of the quality indicator in the pattern following the pattern of the transmitted frame from alternating '0' and '1', for said good and bad frames. 16. The method according to 14, characterized in that it further awaits the receipt of the said bit of the quality indicator in the template following the template of the transmitted frame from alternating '0' and '1', for the said transmission on and off.

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