Radio communication system and method

FIELD: radio engineering.

SUBSTANCE: there proposed is radio communication device having the possibility of adaptive control of modulation and speed method of coding (MCS) of data channel in compliance with the obtained channel quality information (CQI). Device includes control unit having the possibility of selecting modulation and speed method of coding of data channel in compliance with the obtained channel quality information on the basis of the first ratio of compliance between modulation and speed method of channel coding of data and information on channel quality, and besides, having the possibility of selecting transmission power of control channel in compliance with the obtained information on channel quality on the basis of the second ratio of compliance between transmission power of control channel and information on channel quality; and transmitting unit having the possibility of transmitting the data channel in compliance with the chosen modulation and speed method of coding, and with possibility of transmitting the control channel with the selected power.

EFFECT: reducing the volume of information of control channel and performing the appropriate control of control channel transmission power.

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The technical field to which the invention relates.

The present invention generally relates to the field of radio communications, and specifically relates to devices radio and how radio, corresponding to the method of adaptive modulation and coding (Adaptive Modulation and Channel Coding, AMC).

The level of technology

In the communication system, more specifically in the mobile communication system, due to the constantly changing conditions of the communication signal quality is subject to change to a greater or lesser extent. The quality of communication expresses information about the quality of the channel (or quality indicator channel is a Channel Quality Indicator, CQI), specific examples of which are the values of the power signal to the power of the unwanted signal, such as a power ratio "signal/noise" ratio (Signal-to-Noise Ratio, SNR), signal to noise ratio" (Signal-to-lnterference Ratio, SIR), signal-to-interference+noise ratio (Signal-to-lnterference plus Noise Ratio, SINR) and the like. In modern communication systems, with the aim of improving the quality of communication in the system, implemented the concept of access with high-speed transmission of packetized data channel downlink (High Speed Downlink Packet Access, HSDPA), the transmission power (Transmission Power Control, TPC), adaptive control modulation and coding (Adaptive Modulation and Channel Coding, AMC) and other Detailed information on TPC and AMC are shown in non-patent publication 1 below.

Figure 1 schematically depicts a communication system, and specifically the common channel packetized data control channel corresponding to the downlink and passed down the line, and the control channel corresponding to the upward communication line and passed upward communication. It should be noted that the data channel uplink communication in figure 1 for simplicity, not shown. Common channel packetized data is used for data transmission, which correspond to useful information. While you are passing a common channel packetized data using AMC, the transmit power in the channel is maintained at a constant level. In General, the procedure AMC adaptive way produces a change of modulation methods and speed of channel coding in each time interval of the transmission Time Interval, TTI) packages, for example, equal to 2 MS, in accordance with the terms of the radio, thereby increasing the transmission efficiency. Common channel packetized data is shared by many subscribers, while in the specified channel is a method of multiplexing with a temporary seal (Time Division Multiplexing, TDM). The control channel corresponding to the downlink (hereinafter "control channel downlink"), mainly communicates information that is not is required for transmission of the common channel packetized data. The control channel downlink transmits with a fixed modulation scheme and a fixed-rate coding, power control, transmission (TRS). The control channel downlink transmits the packet number, and information about the modulation scheme and the coding rate for the shared channel packetized data, code control transmit power control code re-transfer and similar information. The control channel corresponding to the upward communication line (hereinafter "the control channel uplink communication"), is also transmitted with a fixed modulation scheme and encoding speed, and thus also controlled transmit power. The control channel uplink communication transmits information about the quality of the channel (CQI), the code control transmit power control code re-transfer and similar information.

Figure 2 explains the principle of the procedure the AMC. In figure 2 the horizontal axis represents time and the vertical axis represents the value of the SIR. The SIR value indicates the quality of the signal received by the mobile station, and may correspond to, for example, the indicator CQI to be transmitted over the control channel uplink communication to the base station. In General, the higher the magnitude of the SIR, the better the communication conditions that allow yet to communicate with high quality. In the process, the AMC, by comparing different values of SIR, determination is made whether to use the types of modulation and velocity encoding. In this example, prepared five ways modulation rates and coding and are indicated by numbers of modulation and coding (Modulation and Coding Scheme, MCS) with 1 no 5 (MCS1-MCS5). Identification among the prepared combination is made as a choice option. Scheme MCS1, which has the lowest index and the lowest bit rate that should be used under poor radio conditions. On the other hand, the scheme MCS5 has the highest index and the maximum encoding speed, and it should be applied under ideal conditions of communication. Scheme MCS2, MCS3 and MCS4 represent an intermediate combination between MCS1 and MCS5. For example, when the methods of modulation prepared quadrature phase modulation (a quadrature Phase Shift Keying, QPSK), 16-level quadrature amplitude modulation (16 a quadrature Amplitude Modulation, 16QAM) and 64-level quadrature amplitude modulation (64 a quadrature Amplitude Modulation, 64QAM), for example, QPSK is used in the scheme MCS1, and 64QAM is used in the schema MCS5. When the velocity encoding prepared the speed of 1/3, 1/2, and 3/4, 1/3 is used in the scheme MCS1, and 3/4 is used in the schema MCS5.

When the way AMC mobile station receives pilot signals is (which is also called a pilot channel or a reference signal), which the mobile station identifies, generates information about the quality of the channel (CQI) and transmits data generated CQI to the base station through the control channel of the ascending line of communication. The base station, in accordance with the received CQI information, determines (selects) a suitable combination of the modulation method and coding rate, transmits information about the selected combination to the mobile station through the control channel downlink, and using the specified combination, transfers total channel packetized data. The mobile station performs reception of the common channel packetized data using the transferred data on the combination of the modulation method and the coding rate. By performing such operations for each service (each TT), you can send the data channel with the same modulation method and the encoding speed that best meet the conditions of the radio communication, and thereby increase the efficiency of data transfer.

As mentioned above, when using the appropriate control channels controlled transmit power. The mobile station receives a pilot signal, measures the SIR value, which corresponds to CQI, compares the measured SIR value with a target value that defines the content code management transmit power (typically RA is 1 bit Merom) and transmits the content to the base station. The base station increases or decreases the power of the transmitter in accordance with the adopted code control transmit power, and it is adaptive increase or decrease transmission power in accordance with the terms of telecommunication, and thereby improves the quality of the control channel.

Non-patent publication 1:3GPP, TR25.848 "Physical Layer Aspects of UTRA High Speed Downlink Packet Access" ("Questions of the physical layer for high-speed access to the packaged data in the downlink in the UTRA standard").

As already mentioned, even in standard systems have taken various measures to improve the quality of communication. However, these measures are not enough for communication systems of tomorrow, for communication systems in the future will require further improve the communication quality, high bandwidth, etc. that, as a consequence, will require efficient use of resources. On the other hand, the resources occupied by the control channel cannot be used for useful information. It is therefore desirable to reduce the amount of information in the control channel.

Code control transmission power in many cases is expressed by a binary word of 2 bits. This is advantageous, since the transmitted information is easy to apply, but may adversely affect the quality of communication, if the reception data is the error. For example, if the mobile station sends to the base station a request to increase the transmit power, in case of erroneous reception of the base station management code, the base station will transmit with reduced power, that, at least at the moment will lead to a deterioration SIR, that will cause erratic operation of the mobile station.

Disclosure of inventions

In connection with the foregoing, the present invention is directed to a device Radiocommunication and way radio communications, which can reduce the amount of information in the control channel, and exercise proper management of the transmission power by the transmission of the control channel.

In accordance with one variant of the present invention proposes a radio communications device is configured to adaptively control the modulation method and encoding rate of the data channel in accordance with the received information about the quality of the channel. The device comprises a first data table, setting the first relationship of correspondence between the modulation method and encoding speed and information about the quality of the channel; a second data table, setting the second relationship of correspondence between the transmit power of the control channel and information about the quality of the channel; a first block selection, made possible the awn accessing the first data table to select the modulation method and the coding rate of the data channel in accordance with the received information about the quality of the channel; the second block selection made with recourse to the second data table to select the transmit power of the control channel in accordance with the received information about the quality of the channel; and a transmitting unit configured to transmit the data channel in accordance with the selected modulation method and encoding speed, and capable of transmitting the control channel to the selected output.

In accordance with embodiments of the present invention may be reduced by the amount of information of the control channel and implemented appropriate control transmit power control channel.

Brief description of drawings

Figure 1 presents a diagram of a wireless system.

Figure 2 is a diagram explaining the principle of adaptive modulation and coding (AMC).

Figure 3 is a block diagram (part I) device Radiocommunication corresponding to the variant example of implementation of the present invention.

Figure 4 is another flowchart (part II) device Radiocommunication corresponding to the variant example of implementation of the present invention.

Figure 5 is a block diagram of a radio communication system, based on technology OFCDM.

6 is a diagram of the algorithm, illustrating the procedure for determining the modulation method, the speed of Cody the Finance and power transfer.

7 is a specific example of the data table.

Fig depicts how to perform a method of adaptive modulation and rate control coding, and power control transfer.

Fig.9 represents another specific example of the data table.

Figure 10 represents another specific example of the data table.

11 depicts the values of SIR.

The list of reference symbols

With 302-1 through 302-ND- forming unit channel data;

304 - forming unit control channel;

306 - unit multiplexing;

308 - block inverse fast Fourier transform;

310 - forming unit guard interval;

312 - unit digital to analog (D/A) conversion;

322 - turbocodes;

324 - modulator data;

326 - interleaver;

328 - block series-parallel (S/P) conversion;

330 - unit expansion of the range;

342 - convolutional encoder;

344 - QPSK modulator;

346 - interleaver;

348 - block series-parallel (S/P) conversion;

350 - unit adjustment level;

352 - table data;

354 - control;

402 orthogonal modulator;

404 - heterodyne;

412 - band-pass filter;

414 - power amplifier;

416 - transmitting antenna.

The implementation of the invention

In accordance with one aspect of the present from which retene accesses the data table, showing the relationship between the information about the quality of the channel, the modulation method and encoding rate of the data channel, and power when transmitting on the control channel, and, in accordance with information about the quality of the received channel, selects a modulation method and coding rate of the data channel, and power when transmitting on the control channel. The transmission of the data channel is carried out with the selected modulation method and encoding speed, and the transmission of the control channel is performed with the selected transmit power. As to control the transmission power of the control channel instead of the code control the transmit power used information about the quality of the channel (CQI), the necessity for a code control transmit power, which traditionally has always been necessary, may be excluded. Although the code control the transmit power is expressed only 1 bit, this bit will accompany each package. Therefore, in accordance with the exemplary embodiment of the present invention, obtained savings of a significant amount of resources. In addition, unlike the case of the code transmission control transmit power, coding codes, error-correcting, can be applied to quality information channel (CQI). Therefore, it becomes possible to more accurately convey the control signal for regulating the power PE is Adachi, if you use information about the quality of the channel (CQI)and not code control transmit power, and thus to enable more sustainable management of power transmission.

Information about the quality of the channel can be expressed as a power ratio of the useful signal and the interference in the signal received by the partner on the radio.

Information about the quality of the channel can be expressed by a combination of the modulation method and the coding rate, which indicates the communication partner. When the transmit power, which is suitable for the communication partner can be installed regardless of the capabilities of the partner in terms of noise suppression.

Device for radio communication, in accordance with one aspect of the present invention may be installed at the base station of a mobile communication system.

The ratio of compliance in the data table can be defined to transmit power became smaller when the signal quality indicating information about the quality of the channel becomes better. Differently, the ratio of compliance in the data table can be defined to transmit power became greater when the signal quality indicating information about the quality of the channel becomes worse.

Information about the quality of the channel in the data table can be expressed in a number of intervals of numeric values.

One or several who are boundaries, that set these intervals of values that can be changed in accordance with control information of retransmission data packets received from the communication partner. Because, if you are requesting re-transmission, the condition of the route of transmission (transmission channel) is not favorable, information management re-transmission may indicate the quality of the transmission routes, like quality information channel (CQI). When in accordance with the information about the channel, and information management re-sending updates a table of data, management of power transmission can be implemented in a manner which is best suited to the conditions of the radio. After determining the transmit power may be adjusted in accordance with the information management re-transmission received from the communication partner, while simultaneously updating the data table.

Example 1

Figure 3 shows the block diagram of the communication device corresponding to a first alternative implementation of the present invention. This device is normally provided at the base station, however, may be provided to the mobile subscriber station. A base station used in the communication system in accordance with the technology of multiplexing orthogonal frequency division (Orthoonal Frequency Division Multiplexing, OFDM). The base station contains blocks 302-1 through 302-NDformation of the channel data, the number of which is equal to NDblock 304 channel formation control unit 306 (MUX) for multiplexing unit 308 fast inverse Fourier transform unit 310 of forming a guard interval, block 312 (D/A) digital-to-analogue conversion table 352 data and block 354 management. Because of the structure and function blocks 302-1 through 302-NDformation of the channel data (the number of which is equal to NDidentical, block 302-1 formation of the channel data in the following description to represent the remaining blocks. Each of the NDblocks formation of the channel data (302-1 through 302-ND) can generate one data channel per subscriber, with one data channel per subscriber can be formed by one or more blocks formation of the channel data. Block 302-1 formation of the channel data contains turbocodes 322, the modulator 324 data interleaver block 326 and 328 (S/P) series-parallel conversion. Block 304 forming the control channel includes a convolutional encoder 342, modulator 344 QPSK, interleaver 346, block 348 (S/P) series-parallel conversion and block 350 level adjustment.

Blocks 302-1 through 302-NDformation of the channel data (the number of which is equal to ND) perform processing in the main frequency band with a the Yu data traffic in accordance with OFDM technology. Turbocodes 322 codes codes with error correction to increase the sustainability of traffic data errors. The modulator 324 data uses a suitable modulation method such as QPSK, 16QAM, 64QAM, or similar, to produce the modulated data traffic. Because managed AMC, the modulation methods modulator 324 data and the coding rate in turbocore 322 is changed in accordance with instructions from block 354 management. Interleaver 326 changes the order of data traffic in accordance with the law. Block 328 (S/P) series-parallel conversion converts the signal sequence (stream) into a parallel signal tuples. The number of parallel signal tuples can be defined depending on the number of subcarriers.

Block 304 forming the control channel performs the processing in the main frequency band for transmission of control information in accordance with OFDM technology. Convolutional encoder 342 performs encoding with the purpose of increasing the stability of the control information to the error. Modulator 344 QPSK modulates the control information in accordance with the modulation method QPSK. Although you can use any suitable modulation method, in this example, the applied modulation QPSK, with a small number of levels, since about the eat control information is relatively small. Management of AMC during the transmission of the control channel is not performed, and therefore the encoding and the modulation speed remain the same irrespective of the conditions of the radio. Interleaver 346 changes the order of the control information in accordance with a given law. Block 348 (S/P) series-parallel conversion converts the signal sequence (stream) into a parallel signal tuples. The number of parallel signal tuples can be defined depending on the number of subcarriers. Block 350 level adjustment makes fine-tuning of the amplitude (power) of the digital signal indicating the control channel, in accordance with the instructions of block 354 control.

Block 306 multiplexing performs multiplexing of data traffic and control information that were already processed blocks formation. Multiplexing can be performed in one of the following ways: a temporary way of multiplexing, a method of frequency division multiplexing, a method of code division multiplexing, or a combination of two or more of the following ways. In this example, in block 306 multiplexing served a pilot channel, which in turn is subjected to multiplexing. In another example, the pilot channel may be made in block 348 posledovatel the but-parallel conversion, as shown in broken lines in figure 3, and subjected to multiplexing in the frequency domain.

Block 308 fast inverse Fourier transform performs a fast inverse Fourier transformation of the signal received at the input unit, so as to promoderirovat input signal in accordance with OFDM technology.

Block 310 of forming a guard interval adds to the modulated signal guard interval to form a symbol in accordance with OFDM technology. Guard interval is obtained by copying a part of the final segment of the symbol to be transmitted.

Block 312 (D/A) converts the digital signal to the baseband frequency in the analog signal.

Table 352 data indicates the ratio of correspondence between information about the quality of the channel (CQI) modulation method and encoding rate of the data channel and transmit power control channel.

Block 354 control produces the reference to the data table 352 to select the modulation method, the encoding speed and the transmission power corresponding to the quality information channel (CQI). The selected modulation method, encoding speed, and a transfer method are served on turbocodes 322, the modulator 324 data and in block 350 level adjustment. As mentioned above, block 354, the control may adjust the content of the information supplied to the discrepancies between the data elements, such as turbocodes and similar devices, as well as to adjust the content of the table in accordance with the code management re-transmissions received from the mobile station.

Figure 4 shows the block diagram of the communication device. More precisely, figure 4 depicts the RF transmitting part, which is the stage that follows the block 312 digital-to-analogue conversion, shown in figure 3. RF transmitting section contains the orthogonal modulator 402, a local oscillator 404, band-pass filter 406, the mixer 408, the local oscillator 410, a band-pass filter 412 and the amplifier 414 power.

The orthogonal modulator 402 generates a quadrature component (Q) and in-phase component (I) intermediate frequency of the signal applied to the input of modulator 402. Band-pass filter 406 removes frequency components unnecessary for bandwidth at the intermediate frequency. The mixer 408, using the local oscillator 410, converts the intermediate frequency signal into a high frequency signal (transfers a signal spectrum in the high frequency range). The bandpass filter 412 removes unnecessary frequency components. Amplifier 414 power amplifies the signal from the bandpass filter 412 to transfer the specified signal from the antenna 416.

When, instead of technology OFDM technology is used multiplexing orthogonal frequency and code of the RA the division (Orthogonal Frequency and Code Division Multiplexing, OFCDM), between block 328 series-parallel conversion unit 306 multiplexing unit 330 provides spread spectrum, as shown in figure 5. Block 330 spread spectrum produces the extension base signal through code by multiplying each of the parallel signal tuples extends to a predetermined code sequence. The extension can be performed either in the time domain or in the frequency domain, or a combined image in these two areas (two-dimensional extension).

Traffic data subjected to encoding by turbocodes 322 and modulation unit 324 modulation data. Changing the order in which data traffic is performed by the interleaver 326. Then traffic data is converted to parallel format by block 328 series-parallel conversion. The control information is subjected to encoding, modulation, interleaving and converted to parallel format. Regulation of the electric power control information is converted into a parallel format, is performed component-wise, on subcarriers. Further, the data channel and the control channel are multiplexed on subcarriers block 306 multiplexing. Multiplexed channels modulated in accordance with the OFDM block 308 fast reverse PR is education Fourier. After modulation signal is added to the guard interval, and thus the output is the OFDM symbol with the spectrum corresponding to the fundamental frequency band. The signal with the spectrum corresponding to the fundamental frequency band is converted into an analog signal, and then is subjected to orthogonal modulation by the modulator 402 RF transmitting unit, is bandpass filtered, suitably amplified and then made the transfer.

Figure 6 presents the scheme of the algorithm for determining the modulation method, coding rate, and transmission power. The procedure begins with step 602, in which a base station receives information about the quality of the channel (CQI). Information about the quality of the channel (CQI) is input to a block 354 management 3.

At step 604 block 354 control accesses a table 352 data and selects the modulation method, coding rate, and transmission power, which correspond to quality information channel (CQI). Information about the quality of the channel (CQI) can be expressed by the value of SIR. In this case, the table 352 data establishes the correspondence between a set of intervals of values from SIR SIR1 to SIR5, many combinations of modulation methods and speed of coding from MCS1 to MCS5, and plenty of power values of the transmission from PTX1up to RTX5as shown the and 7. In the present example, as methods of modulation prepared QPSK and 16QAM, and the speed of coding R=1/3, 1/2 and 3/4. When the received CQI value belongs to the worst interval SIR1, selects the combination MCS1 (QPSK, R=1/3), which has the smallest set of modulation levels and the minimum encoding speed (maximum redundancy), and selects the maximum power of PTX1transmission. When the received CQI value belongs to the best interval SIR5, selects the combination MCS5 (16QAM, R=3/4), which has the largest range of levels of modulation and the maximum encoding speed (closest to 1), and selects the minimum power PTX5transmission. When the received CQI value belongs to the interval SIR2, is a combination of QPSK and R=1/2, and power PTX2(<PTX1). When the received CQI value belongs to the interval SIR3, is the combination of QPSK and R=3/4, and power PTH(<RTX2). When the received CQI value belongs to the interval SIR4, selects the combination 16QAM R=1/2, and power PTX4(<RTH). That is, when the CQI indicates poor signal quality, the definition of each parameter is to sacrifice the effectiveness of knowledge transfer, but the quality of signal reception by the mobile station made the odds more favorable. On the other hand, when the CQI indicates good signal quality, the definition of each parameter is to increase the effectiveness of knowledge transfer. Although for ease of explanation, the value of the CQI and transmit power values are divided into five intervals (five categories), these values by the values can be divided into any suitable number of intervals (categories).

At step 606 must be made to transfer the data channel using the selected modulation method and the coding rate. To accomplish this transfer, block 354, the control passes to turbocodes 322 and the modulator 324 data information about the selected modulation method and the coding rate. In addition, the transmission of the control channel with the selected transmit power. To accomplish this transfer, block 354 control passes to block 350 level adjustment information about the selected power level.

Steps 602-606 are repeated for each package, namely for the time interval of transmission (TTI). In addition, because from one mobile station to another of the transmission conditions are changed, for each mobile station is adaptive control modulation method and encoding speed. On Fig it is shown that besides the fact that for each TTI is the modulation method and / min net is ü coding shared data channel, for each TTI controlled transmit power corresponding to the control channel for transmission of control information. In the General case, when the CQI indicates poor signal quality, which in worst case can match SIR1, the number of levels of modulation and encoding speed data channel set to a low value and the transmit power of the corresponding control channel is set high. On the other hand, when the CQI indicates good signal quality, which at best can match SIR5, the number of levels of modulation and encoding speed data channel are high and the transmit power of the corresponding channel control is set low. Incidentally, as for the data channel, it is set to constant power level, as for the control channel, it always sets the modulation method QPSK, and consistently rate coding R=1/3. Because the control channel carries a small amount of information, the modulation method and the encoding speed is selected so that the highest priority is reliability, not the effectiveness of knowledge transfer.

As shown in Fig.9, information about the quality of the channel (CQI) can be expressed by combinations of MCS1-MCS5 modulation method and the coding rate, which produces mobile station and not the values of SIR, which the mobile station measures. In this case, combinations of the modulation method and the coding rate (in the middle column of tables 7 and 9)that are prepared in the data table of the base station that uniquely correspond to the possible combinations in the left column of the table Fig.9), which produces mobile station. Each of the combinations of the data table has the same modulation method and encoding speed, and that an appropriate combination in the left column of the table of figure 9. When used in a table format shown in figure 9, block 354 control 3 phase 604 6 references table 352 data to select the modulation method, the encoding speed and power transfer, which correspond to the information provided about the quality of the channel (CQI). Provide information about the quality of the channel (CQI) is any one of values MCS1-MCS5, this is the choice of the transmit power corresponding to a particular combination of modulation method and the coding rate. Next, at step 606, block 354 management 3 transmits the selected data in turbocodes 322 and the modulator 324 data, and tranferring the data channel in accordance with the supplied modulation method and the encoding speed by a method similar to that described above. In addition, the data transmit power selected by block 354 control, pass is implemented in block 350 level adjustment, and you are passing a control channel with the selected power level.

In General, there are different types of mobile stations. For example, some so complex that includes the function of protection against interference implemented, for example, by a suppressor; and others are so simple that such a function does not contain. Complex mobile station can highly suppress noise components in the received signal, and thereby significantly improve the signal quality (SIR). To have a magnitude SIR transmitted to the base station varies depending on the method of signal processing in the mobile stations, and therefore the transmission power of the control channel can be selected correctly. On the other hand, the combination of the modulation method and the coding rate (which is expressed by the parameter MCS)developed a mobile station that does not depend on the method of signal processing of the mobile station. This is because the mobile station generates MCS so as to maintain the desired SIR value, and passes it the value of the SIR to the base station. Therefore, from the point of view of determining the power of the PTXitransmission suitable for the mobile station, it is desirable to transmit MCS from the mobile station to the base station, while the installed capacity will not depend on acts mobile station function inhibition is of interference or not.

Incidentally, although the values of SIR, MCS and lots of power values in tables Fig.7 and Fig.9 are divided into the same number of groups, the present invention is therefore split groups is not limited. For example, the ratio of correspondence between SIR and transmit power, and the ratio of correspondence between SIR and MCS can be defined as shown in the table in figure 10 (where M≠N). From the point of view of control of power transmission, in accordance with this embodiment of the present invention, without changing the existing scheme of control AMS, it is desirable to conduct individually control table for AMC and under table to control the transmit power, as shown in figure 10.

Example 2

The control channel uplink communication may contain the result of the error detection is carried out on the signal transmitted in downlink. The procedure of detecting errors usually can be a control with cyclic redundancy code Cyclical Redundancy Check, CRC). More precisely, when using automatic resend request (ARQ), to the base station is transmitted to not only the result of error detection, but also the number of the packet to be re-transfer, or similar data, such as control code re-transmission. When, in accordance with the second embodiment is altoadige of the invention, the base station receives the signal ACK, which indicates that no errors have been detected, the base station accesses a table 352 data and transfers the control channel with a transmit power corresponding to the received CQI value. On the other hand, when the base station receives the NACK signal, which indicates that there was an error is detected, the base station performs the transmission of the control channel capacity (PTXi+Δ), higher than the power (PTXi) transfer, selected from table 352 data. The value Δ can be chosen randomly, based on the results of the experiment or simulation. Because errors are a good indicator of the conditions of the radio communication, it is more appropriate management of the transmission power on the basis of the results of error detection in addition to the CQI.

Example 3

The number of receipts NACK messages can be enabled as an additional parameter in the table 352 data to associate this value with other parameters. When is the appropriate management of AMS, the expected number of receipts NACK signal will be small. In accordance with a third embodiment of the present invention, the base station monitors the number of times for a specified period of time, including several TT, received signal is a NACK provided the transfer of control channel was made at a certain power level. When the number of received NACK signals becomes large certain number, you will update the table so that the transmission of the control channel is carried out at higher power (e.g., RTX2).

Figure 11 shows how the shift interval of values to which should belong to the passed value of SIR. Figure 11 shows the intervals of values of SIR2 and SIR3, and values boundaries (thresholds) between these intervals, which we denote by S12, S23, S34. Similarly, there are intervals SIR1, SIR4 and SIR5 and the values of their borders, but they are for simplicity not shown. In this case, it is assumed that the SIR value, received from the mobile station has a value indicated by a cross (×). Because this value belongs to the interval SIR3, the transmit power in accordance with table 7 is equal to RTH. In this case, it is assumed that the number of NACK signals transmitted to the base station in response to transmission of the control channel with a capacity of PTHfor a specified period of time, more than a specific number. In this situation produced a shift in the boundary of S23towards large values, a new boundary S23'. In the result, the value of SIR, is marked by a cross (×), belongs to inter the Alu SIR2, and the transmission power becomes equal to RTX2(>RTH). Thus, when the NACK signals are received repeatedly, you can update the appropriate ratio to use transmit power, suitable for radio at this time. To simplify figure 11 shows that when shifting the boundaries of S23shifting boundaries of S12and S34not happening, but this is optional. Together with the boundary of S23can be pushed and boundaries of S12and S34For example, each boundary may be shifted so as to satisfy the following relationship: S12' (border after shift) - S12=S23'-S23=S34'-S34=...=ΔS (for example, +1dB). In this way, each interval values can be shifted by the same value.

When the number of transmitted signals NACK is less than some given number, the table update is optional, but it can be done. When upgrading this should be done so that the transmission of the control channel to produce at a lower power, for example, RTX4instead of PTX3. That is, to update the table so that the shift of boundaries occurred in the direction of lower values. Although speaking about high quality signal transmission, it is desirable to have a smaller number of NACK messages, but interference to neighboring subscribers can be more plain, when the quality becomes too high. Therefore, when the number of transmitted signals NACK is less than the specified number, it is advisable to update the table be made so that the transmit power is reduced.

This change of limit values (threshold values) intervals SIR should be reflected in power transmission. However, it is not necessary to have this effect on S - combinations of the modulation method and the coding rate. So when is the fine adjustment of the limit values depending on the frequency of receiving the NACK signal, as explained in the above example, it is desirable that the table was formed separately, as shown in Fig.9.

Although the present invention has been described in terms of preferred options, the invention described examples are not limited to, and in the form and details of the invention can be modified, not beyond the limits of ideas and scope of the invention. In addition, for convenience the invention is described with reference to separately presented options for implementation. However, for the present invention, the separate status of the options is not significant, and, if necessary, one or more preferred options can be used together.

This international application is based on priority application Japan 2005-170752, filed in the Japan patent office on 10 June 2005, the content of what toroi entirely included in the present invention by reference.

1. The radio communications device is configured to adaptively control the modulation method and encoding rate of the data channel in accordance with the received information about the quality of the channel containing:
the control unit is configured to select the modulation method and the coding rate of the data channel in accordance with the received information about the quality of the channel based on a first ratio of correspondence between the modulation method and encoding rate of the data channel and the information channel, and, in addition, made with a choice of transmit power control channel in accordance with the received information about the quality of the channel based on the second relation of correspondence between the transmit power of the control channel and information about the quality of the channel; and
transmitting unit configured to transmit the data channel in accordance with the selected modulation method and encoding speed and is able to transmit the control channel to the selected output.

2. The device according to claim 1, characterized in that information about the quality of the channel is expressed by the ratio of the power of the useful signal power to the noise in the signal received by the communication partner.

3. The device according to claim 1, characterized in that information about the quality of the channel is expressed by a combination of the modulation method and speed to the financing, this combination indicates a communication partner.

4. The device according to claim 1, characterized in that is installed on the base station of a mobile communication system.

5. The device according to claim 1, characterized in that mounted on a mobile station of a mobile communication system.

6. The device according to claim 1, characterized in that the second relation of conformity established so that when the improved signal quality, which indicates information about the quality of the channel is reduced transmit power.

7. The device according to claim 1, characterized in that the second relation of conformity established so that when the deterioration of the signal quality, which indicates information about the quality of the channel is increased transmit power.

8. The device according to claim 1, characterized in that information about the quality of the channel is expressed by a set of intervals of numeric values.

9. The device according to claim 8, characterized in that the possibility of changing the values of one border or the many boundaries that define a set of intervals of numeric values.

10. The device according to claim 1, characterized in that it is made with the possibility of correction of the selected transmission power in accordance with the information of the re-transmission received from the communication partner.

11. Way radio communications, comprising stages, which are:
take the information as to the channel from the communication partner;
select the modulation method and the coding rate of the data channel in accordance with the received information about the quality of the channel based on a first ratio of correspondence between the modulation method and encoding rate of the data channel and the information channel, and selects the transmit power of the control channel in accordance with the received information about the quality of the channel based on the second relation of correspondence between the transmit power of the control channel and information about the quality of the channel; and
produce transmission data channel in accordance with the selected modulation method and encoding rate of the data channel, and transmitting the control channel with the selected power.



 

Same patents:

FIELD: information technology.

SUBSTANCE: methods of reporting channel quality indicators (CQI) are described. Data activity at a receiver may be determined, and CQI reporting by the receiver may be adjusted based on the determined data activity. In one design, CQI reporting may be enabled for a time window around each expected packet arrival for a periodic or quasi-periodic transmission and may be suspended outside of the time window. In another design, CQI reporting may be varied based on ACK/NACK feedback. In yet another design, CQIs may be sent at a first rate when data activity is not detected and at a second rate faster than the first rate when data activity is detected. In yet another design, CQIs may be sent only during discontinuous transmission (DTX) ON periods when data activity is not detected and may be sent during both DTX ON and OFF periods when data activity is detected.

EFFECT: efficient channel quality reporting in wireless communication system.

11 cl, 11 dwg

FIELD: information technology.

SUBSTANCE: signal transmission method involves generating orthogonal comb-like spectra of control signals distributed in a certain unit within the frequency unit of the frequency band of the system and transmitting the control signals. The bandwidth of the frequency unit is determined in accordance with the bandwidth and the frequency set by the base station so that control signals transmitted by corresponding mobile stations are orthogonal on frequency.

EFFECT: improved reception quality owing to multibeam interference control and high efficiency of using energy of the transmitting apparatus.

9 cl, 38 dwg

FIELD: information technology.

SUBSTANCE: invention provides a method for enabling a user equipment (UE) to transition between reception levels for monitoring the scheduling channel in a wireless communication system, comprising steps on which: the scheduling channel is discontinuously monitored on the first DRX level; a first time counter is launched when the scheduling channel indicates transmission or reception of data from a base station; the scheduling channel is continuously monitored while the first time counter operates; and transitioning is made to the first DRX level or the second DRX level when a DRX indicator is received from the base station.

EFFECT: minimisation of power consumed by user equipment.

15 cl, 12 dwg

FIELD: information technology.

SUBSTANCE: invention discloses a method of allocating (code division multiple access) CDMA channels applicable to a mobile communication system which performs communication by using two or more CDMA channels, the method comprising: independently allocating CDMA channels for each active sector corresponding to a particular mobile station (i.e., frequency assignments), such that each active sector is allocated at least one CDMA channel; and transmitting packet data using the allocated CDMA channel.

EFFECT: high efficiency of transmitting control signals.

31 cl, 3 dwg, 4 tbl

FIELD: information technology.

SUBSTANCE: mobile terminal receives a specific common H-RNTI (HS-DSCH Radio Network Identifier) via an HS-SCCH (High Speed-Shared Control Channel) associated with an HS-DSCH (High Speed-Downlink Shared Channel), recognises whether a header of a MAC (Medium Access Control) PDU (Packet Data Unit) transmitted by the HS-DSCH includes a terminal-exclusive identifier, acquires the terminal-exclusive identifier, and processes the MAC PDU as its own if the acquired terminal-exclusive identifier is intended for the terminal itself.

EFFECT: high carrying capacity.

10 cl, 15 dwg, 1 tbl

FIELD: information technologies.

SUBSTANCE: planner determines whether to create information on dedication of resources to areas of upperlink control, and generator creates information on dedication of resources to areas of upperlink control in accordance with the result of determination.

EFFECT: reduced volume of information message on distribution of resources in broadband system of wireless communication.

28 cl, 8 dwg

FIELD: information technologies.

SUBSTANCE: invention relates to method to perform procedure of random access by radio interface (106), for instance, between mobile terminal (102) and base radio station (104) of mobile network (108). Aspect of method, according to the invention, includes stages, at which a request of synchronisation (112) is sent for information of synchronisation; synchronisation information (114) is received in response to request of synchronisation; and request (116) of resources for resources of data transfer is sent on the basis of at least one parametre of transfer corrected in compliance with information of synchronisation.

EFFECT: improved accuracy of synchronisation.

18 cl, 8 dwg

FIELD: information technologies.

SUBSTANCE: method of transfer includes stages, at which information of mobility is established, including information elements to indicate at least one type of service/roaming transfer according to whether support of interactive network is available or not to transfer service/roaming; information of mobility is inserted, at least, into one of ESG, related to broadcasting services, message of notice and independent service message, so that information of mobility is transferred to at least one terminal; and service or roaming of terminal is transferred according to information of mobility.

EFFECT: invention provides for support of service and roaming transfer in digital broadcasting system.

28 cl, 19 dwg, 11 tbl

FIELD: information technologies.

SUBSTANCE: method is suggested to transfer and receive information of radio access, which provides for faster and more efficient route for establishment of radio communication between terminal and target basic station for terminal during performance of transition into cell of target basic station. Network sends information to terminal ahead of time on radio access or similar information so that terminal may connect to target cell by a faster method, which minimises total time of transition process.

EFFECT: providing the terminal with faster and more efficient method of access to target basic station in process of terminal transition into cell of target basic station.

26 cl, 9 dwg

FIELD: information technologies.

SUBSTANCE: system and method to produce notice based on location in network with detection of location of protected user plane "suPL", which are provided by platform of location detection on the basis of "suPL" - (platform "SLP") and improved terminal "SET", supporting "suPL", in order to verify password on the basis of terminal location. Besides, when a client requests positioning of terminal "SET", platform "SLP' sends parametre of notice type to terminal "SET" by means of initial message on session, thus it is possible to predetermine whether the notice is produced on the basis of location or right of use, when platform "SLP" (i.e. server system) notifies terminal "SET" (or user of terminal "SET") on positioning of this terminal "SET", requested by the client (i.e. the client system), in order to make it possible for the terminal to determine time point of response to notice.

EFFECT: improved system of data processing.

17 cl, 7 dwg, 2 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for single-ended radio communications between mobile objects whose routes have common initial center involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile object, these intermediate transceiving drop stations being produced in advance on mentioned mobile objects and destroyed upon completion of radio communications. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning of several radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

1 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer from mobile object to stationary one residing at initial center of common mobile-object route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile object, these intermediate transceiving drop stations being produced in advance on mobile object. Proposed radio communication system is characterized in reduced space requirement which enhanced its effectiveness in joint functioning with several other radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 6 dwg

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile object from stationary one residing at initial center of mobile-object route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile object, these intermediate transceiving drop stations being produced in advance on mobile object. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning with several other radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 6 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method for single-ended radio communications between mobile objects whose routes have common initial center involves use of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile objects. Proposed radio communication system is characterized in reduced space requirement and, consequently, in enhanced effectiveness when operating simultaneously with several other radio communication systems.

EFFECT: reduced mass and size, enhanced noise immunity and electromagnetic safety for attending personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile objects from stationary one residing at initial center of common mobile-objects route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from first mobile object. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in simultaneous functioning of several radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile objects from stationary one residing at initial center of common mobile-objects route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from first mobile object, these intermediate transceiving drop stations being produced in advance on first mobile object. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning with several other radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method for single-ended radio communications between mobile objects having common initial center involves use of low-power intermediate transceiver stations equipped with non-directional antennas and dropped from mobile objects. Proposed radio communication system is characterized in reduced space requirement and, consequently, in enhanced effectiveness when operating simultaneously with several other radio communication systems.

EFFECT: reduced mass and size, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile objects from stationary one residing at initial center of common mobile-objects route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from first mobile object, these intermediate transceiving drop stations being produced in advance on first mobile object and destroyed upon completion of radio communications between mobile and stationary objects. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning with several radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications engineering; digital communications in computer-aided ground-to-air data exchange systems.

SUBSTANCE: proposed system designed to transfer information about all received messages irrespective of their priority from mobile objects to information user has newly introduced message processing unit, group of m modems, (m + 1) and (m + 2) modems, address switching unit, reception disabling unit whose input functions as high-frequency input of station and output is connected to receiver input; control input of reception disabling unit is connected to output of TRANSMIT signal shaping unit; first input/output of message processing unit is connected through series-connected (m + 2) and (m + 1) modems and address switching unit to output of control unit; output of address switching unit is connected to input of transmission signal storage unit; t outputs of message processing unit function through t respective modems as low-frequency outputs of station; initialization of priority setting and control units, message processing unit clock generator, and system loading counter is effected by transferring CLEAR signal to respective inputs.

EFFECT: enhanced efficiency due to enhanced throughput capacity of system.

1 cl, 2 dwg

FIELD: radiophone groups servicing distant subscribers.

SUBSTANCE: proposed radiophone system has base station, plurality of distant subscriber stations, group of modems, each affording direct digital synthesizing of any frequency identifying frequency channel within serial time spaces, and cluster controller incorporating means for synchronizing modems with base station and used to submit any of modems to support communications between subscriber stations and base station during sequential time intervals.

EFFECT: enhanced quality of voice information.

12 cl, 11 dwg

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