Device for generating set of radio communication parameters, transmitter and receiver

FIELD: information technology.

SUBSTANCE: disclosed is a mobile station having: a module for correcting the transmission time interval which is configured to determine the transmission time interval in the mobile station - base station direction in units of the length of transmission time intervals in the base station - mobile station direction, such that the transmission time interval in the mobile station - base station direction is longer than that in the base station - mobile station direction; a transmission module configured to transmit a signal in the mobile station - base station direction in a transmission time interval defined by the module for correcting the transmission interval.

EFFECT: increase in the information transmission unit element on the time axis or frequency axis depending on conditions of the communication environment, which enables to lower the frequency of introducing the control channel and increase data transmission efficiency.

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The technical field to which the invention relates.

The present invention relates to a device for generating radio parameters, the transmitter and the receiver.

The level of technology

In mobile communication systems in which exchange occurs mainly video and/or data, there is a need for a much higher processing power compared with the mobile communication systems of the third generation (IMT-2000), as well as providing increased capacity, higher speed and wide bandwidth. Such systems are intended for use in various communication environments, such as inside buildings and outside. In areas outside the buildings used multiple-cell (megastoma) configuration, covering large areas and allow a quick batch transmission for fast moving mobile station. Inside buildings is more intense attenuation of radio waves, so there are internal points of access, and support for external radio base stations is not used. There are other reasons, such as the efficient use of communication resources, due to which the communication packet switched connection is used instead of conventional type circuit-switched even radio channels. When realizaciones between the mobile station and the upstream device, not a base station, in particular, when the data transmission in the downstream direction, is used not only scheme with unicast, and multicast scheme with transmission and scheme of the broadcast, see, for example, non-patent document 1, which describes the prospects of future communication systems.

On the other hand, a large value in a broadband mobile communication systems in environments with multipath propagation has a frequency-selective fading. Therefore, a promising scheme for next generation communication scheme is OFDM (Orthogonal Frequency Division Multiplexing, multiplexing orthogonal frequency division). A single symbol in the OFDM scheme is generated by adding to a meaningful component of the symbol containing primarily designed for transfer of information to the guard interval, and during the lapse of the preset time transmission interval (transmission time interval, TTI) is passed a set of symbols. Guard interval contains a piece of information from significant component of the symbol. Guard interval can also be called a cyclic prefix cyclic prefix, CP) or header.

On the side of the receiver is receiving signals passing in different ways, with different propagation delays. According to the OFDM scheme, if the magnitude of the propagation delay in point is adalah period guard interval, the intersymbol interference can be significantly reduced. Thus, a relatively large period of the guard interval allows advantage to put the detainees waves. This is especially advantageous in cases due to the extremely large radius cell and at simultaneous transmission of the same information from different sites on the mobile station in accordance with the scheme to the multicast transmission. On the other hand, the guard interval contains only a fragment of a significant component of the symbol, therefore, a longer guard interval is not preferable from the point of view of information transfer efficiency. In some cases, a sufficient link quality in environments with relatively short propagation delay, such as municipal buildings and areas within buildings, or environments to use unicast transmission can be ensured when installing a relatively small guard interval duration. Therefore, it is impossible to define a single type of guard interval, optimal for different communication environments. With this in mind, it is proposed to use multiple sets of radio parameters on the basis of which will be determined characters, including protective intervals of different sizes, and use the radio with adaptive selection of wholesale the normal format characters. It should be noted, however, that the signal processing corresponding to the specified formats characters, leads to extremely high workload, which is unfavorable for mobile stations a relatively simple configuration. In the case of a mobile station that does not have the possibility to change the working (clock) frequency is strictly limited signal processing, and, as a consequence, the above problem can be for such a mobile station is particularly serious.

Non-patent document 1: Ohtsu, "Systems beyond IMT-2000" (System following the IMT-2000 generation), ITU Journal, vol.33, No.3, pp.26-30, Mar. 2000.

Disclosure of inventions

The above-mentioned time transmission interval (TTI) defines various parameters of data transmission. For example, in the case of scheme MCS (Modulation and Coding Scheme, modulation scheme and coding) TTI defines parameters such as the identity element packet, the update frequency of the modulation scheme and data rate channel coding; in the case of scheme ARQ (Automatic Repeat reQuest automatic repeat request) is the unit element encoding with error correction and a single element of the second transmission; in addition, TTI depends on the single-item planning packages. The control channel that carries control information, for example information (MCS information retransmission and inform the tion planning, used in demodulation of the data channel, therefore, the control channel should be used during each TTI, along with the data channel. On the other hand, the user can transmit information over one or more TTI, depending on the content of the communication. Accordingly, if the data transfer uses a lot of TTI, is the multiplexing control channels for respective TTI during transmission. On the other hand, if the same user sends data continuously (see Fig. 1), the control channel for some TTI may not be required, since there is no need to change the radio parameters for each TTI. Use the control channel for transmission during each TTI is not preferred from the viewpoint of transmission efficiency.

Currently considered OFDM system for mobile communications, according to which a wide frequency band is divided into multiple frequency blocks, and a single item of information transmission along the frequency axis corresponds to the frequency block. Frequency block may also be called a fragment (or resource block), one frequency block includes one or more subcarriers. The user can transmit information via one or more frequency blocks. If the transmission of the data using multiple frequency blocks, when the transfer is done multiplexing multiple control channels for respective frequency blocks as the data channel is used for transmission of each frequency block. In addition to the aforementioned information, MCS, these control channels may contain information about the distribution of frequency blocks, etc. Similarly to the above, if one user transmits data through multiple frequency blocks (see Fig. 2), using the control channel for all frequency blocks may be optional. Use the control channel for the transmission of each frequency block is also not preferable from the viewpoint of transmission efficiency.

The present invention is directed to solving at least one of the above-mentioned problems. The main objective of the present invention to provide a transmitter, a receiver and a device generating character settings, allowing to increase the efficiency of information transmission in the OFDM system for mobile communications.

According to one aspect of the present invention offers the OFDM transmitter, which includes:

module data modulation and channel coding executed to perform data modulation and channel coding for the data channel, and the parameters of the modulation level and the RMS of the spine of channel coding are updated for each time transmission interval;

a multiplexing module, configured to multiplex the control channel and data channel for each time transmission interval; and

module correction made with the possibility of adjusting the length of the time interval of the transmission.

According to the present invention may increase the efficiency of data transmission in the OFDM system for mobile communications.

Brief description of drawings

figure 1 presents a variant according to which the transmission is used control channels and data channels;

figure 2 presents a variant according to which the transmission is used control channels and data channels;

figure 3 presents (first) block diagram of the transmitter according to a variant implementation of the present invention;

figure 4 presents (second) block diagram of the transmitter according to a variant implementation of the present invention;

figure 5 presents a block diagram of a receiver according to a variant implementation of the present invention;

figure 6 shows the relationship of two types of TTI (long TTI and short TTI) and frame;

figure 7 shows a variant, according to which the transmission is used control channels and data channels;

on Fig presents a variant according to which the transmission is used control channels and data channels;

figure 9 shows the formats of characters certain sets of symbols received in accordance with the embodiment of the present invention;

figure 10 shows the different sets of characters received in accordance with the embodiment of the present invention;

figure 11 shows the formats of symbols that correspond to specific sets of symbols received in accordance with the embodiment of the present invention.

The list of designations

from 302-1 to 302-ND: module handle channel data

304: processing extension of the control channels

306: module multiplexing

308: module inverse fast Fourier transform

310: the module making the guard interval

312: module digital to analog conversion (DAC)

320: the module settings radio

322: turbocodes

324: module data modulation

326: module rotation

328: module serial-to-parallel conversion (S/P)

342: module convolutional coding

344: module QPSK modulation (a quadrature Phase Shift Keying, Quaternary phase shift keying)

346: module rotation

348: module serial-to-parallel conversion (S/P)

402: module orthogonal modulation

404: heterodyne

406: band-pass filter

408: mixer

410: heterodyne

412: bandpass filter, the

414: the power amplifier

502: antenna

504: low noise amplifier

506: mixer

508: heterodyne

510: band-pass filter

512: the automatic gain control

514: orthogonal detector

516: local generator

518: module analog-to-digital conversion

520: detector synchronization symbols

522: module remove guard interval

524: the modulus of the fast Fourier transform

526: demultiplexer

528: module channel estimation

530: the compensation module channel

532: module parallel-serial conversion (P/S)

534: the compensation module channel

536: module address interleave

538: turbocodes

540: the Viterbi decoder

542: an adjustment module parameters

544: module correction TTI

The implementation of the invention

According to one aspect of the present invention, the time transmission interval (TTI) is adjusted depending on the environmental conditions of communication. The control channel is multiplexed with the data channel for each TTI. The control channel can be multiplexed in a part of the plurality of subcarriers. Increase a single item of information transmission along the time axis and/or axis frequency depending on the environmental conditions of communication makes it possible to reduce the frequency of making (distribution) control channel and to increase the efficiency of data transfer.

The control channel may contain information about the level of modulation and speed channel coding. The transmitter can store two or more sets of parameters, each of which defines a symbol that includes a guard interval with a different period and a significant component of the symbol with the same period. The transmitter may determine the format of the symbol depending on environmental conditions due without delay.

According to one aspect of the present invention proposes a device for the generation of the set of radio parameters used in the mobile communication system according to the OFDM scheme, transmitting or receiving a lot of characters in each time interval of the transmission, each of a specified set of characters includes a guard interval and a significant component of the symbol. The specified device includes a first calculation module, configured to calculate a second parameter set of characters so that the period of most significant component of the symbol, defined by the first set of parameters of the symbol equal to the period the most significant component of the symbol defined by the second set of settings, characters, and the period of the guard interval, defined by the first set of characters, different from the period of the guard interval defined by the second set of characters. Decree is a great device also includes a second module for computing, configured to calculate a third set of characters so that the share of the guard interval symbol, defined by the first set of characters, equal to that of guard interval of a symbol defined by a third set of parameters, symbols, and symbol length, defined by the first set of characters, different from the length of the symbol defined by a third set of characters. The length of the time interval of the transmission symbol length, or the length of the time interval of the transmission time and the character length is adjusted so that during one time interval for transmission is passed an integer number of symbols. The specified device can efficiently compute the set of parameters of the radio communication, with the preferred number of used subcarriers, the preferred loss rate (share of guard interval in the symbol) and the preferred number of characters within one or more TTI. For example, if we assume that periods of significant symbols equal (i.e. equal intervals of subcarriers), in any radio communications device can always use the same process of signal processing for modulation and demodulation of OFDM (inverse fast Fourier transform and fast Fourier transform) even when using any set of parameters is ingelow. In addition, if it is assumed that the loss rate is kept constant, the transmission efficiency can be maintained even when using any set of characters.

According to one variant of implementation of the present invention calculates the parameter set of characters, and set the required interval values of subcarriers and loss factor. For example, the number of subcarriers corresponding to a certain set of characters can be defined as an integer multiple of the number of subcarriers corresponding to a different set of characters. Thus, by changing the interval of subcarriers and loss factor, you can obtain a set of characters with a significantly different period of the guard interval. If the change of loss factor in a time transmission interval is a non-integer number of characters, number of characters for each time transmission interval can be adjusted to an integer by increasing the time interval of the transmission. This correction is preferred from the viewpoint of ease of signal processing.

The first option exercise

In the following embodiment describes the system in a downward direction in which it is used and therefore the and OFDM (Orthogonal Frequency Division Multiplexing, multiplexing orthogonal frequency division), but the present invention is applicable to other systems that use the scheme with many carriers.

In Fig. 3 shows a first block diagram of a transmitter according to one variant of implementation of the present invention. This transmitter is usually installed at the base station, however, this transmitter can be installed in the mobile station. The base station includes NDmodule 302-1 to 302-Nd) processing of data channels, the module 304 of the processing of the channel management module 306 multiplexing (MUX)module 308 inverse fast Fourier transform (OBPF), the module 310 making the guard interval, the module 312 digital to analog conversion (DAC) module 320 settings, characters and module 321 correction TTI. Modules from 302-1 to 302-NDprocessing of the data channels have the same configuration and functions, and as an example, the following is the module 302-1 signal processing. Module 302-1 processing of data channels includes turbocodes 322, module 324 modulation data module 326 rotation and module 328 series-parallel conversion (S/P). Module 304 of the processing of the control channels includes a module 342 convolutional coding module 344 QPSK modulation, module 346 rotation and module 348 serial is Ino-parallel conversion (S/P).

Modules from 302-1 to 302-NDprocessing of data channels perform operations in the main frequency band to transmit data flow information in accordance with the OFDM scheme. Turbocodes 322 performs encoding for enhanced stability data flow information to the error. Module 324 performs data modulation modulation data flow information in accordance with the desired modulation scheme such as QPSK, 16QAM (a quadrature Amplitude Modulation, quadrature amplitude modulation) and 64QAM. In case of use of adaptive modulation and coding (adaptive modulation and coding, AMC) the specified modulation scheme when necessary, changed. Module 326 alternating sorts the data flow information in accordance with a predefined pattern. Module 328 series-parallel conversion (S/P) converts a serial signal (stream) parallel streams of signals. The number of parallel streams of signals can be set depending on the number of subcarriers. Modules from 302-1 to 302-ND processing of data channels perform the above operations for each time transmission interval supplied by the module 321 correction TTI.

Module 304 of the processing of the control channels performs the operations in the main frequency band for data transmission control information in accordance with the OFDM scheme. Module 342 convolutional coding performs to the licensing with the aim of increasing sustainability data management. Modulator 344 performs QPSK modulation data control information in accordance with the modulation scheme QPSK. In this embodiment, may be used and other suitable modulation scheme, the choice of modulation scheme QPSK with a small number of modulation levels is due to its inherent lower amount of data information management. Module 346 alternating sorts of data control information in accordance with a predetermined pattern. Module 348 series-parallel conversion (S/P) converts a serial signal into parallel streams of signals. The number of parallel sequences of signals may be determined based on the number of subcarriers.

The module 306 multiplexing (MUX) multiplexes the processed (modulated, encoded, and so on), data flow information and the processed data information management. In this embodiment, the pilot channel (reference signal) may be injected into the module 306 multiplexing where it is multiplexing. In other embodiments, the pilot channel can be entered in the module 348 series-parallel conversion where it is multiplexing along the frequency axis, as shown by the dotted line in Fig. 3. Multiplexing can be performed according to the scheme of temporary multi the complexation, frequency multiplexing or frequency and time multiplexing.

The module 308 inverse fast Fourier transform performed on the incoming signal inverse fast Fourier transform, and then performs modulation scheme is OFDM.

Module 310 making the guard interval generates a symbol in accordance with the OFDM scheme by adding a guard interval to the modulated signal. As you know, the guard interval is generated by duplication of a fragment of the beginning or end of a transmitted symbol.

The module 312 digital to analog conversion (DAC) converts the digital signal in the primary frequency band in the analog signal.

Module 320 set the character set of symbols for use in the communication process. The character settings (set of characters) include information that defines the format of the characters according to the OFDM scheme, as well as a set of information elements that define some values, such as the period TGIguard interval, the period of most significant component of the symbol, the ratio of the size of the guard interval to the size of one character interval of subcarriers. It should be noted that the period of most significant component of the symbol equal to the inverse value of the interval of subcarriers 1/. Module 30 settings, characters sets the desired parameter set of characters depending on environmental conditions or by commands from other devices. For example, the module 320 settings, characters can selectively apply different sets of characters, depending on whether the connection scheme to the multicast transmission. So, in the case of schemes with unicast transmissions can be applied to a set of characters that describe a guard interval with a short period, and in the case of schemes with multicast transmission can be applied to a set of characters that describe a guard interval with a longer period. Module 320 settings, characters can count and calculate the set of required parameters symbols for each case. In an alternative embodiment, the module 320 settings, characters beforehand can save multiple sets of characters and settings as necessary to select the desired parameter set of characters. The principle of choosing the set of parameters of the character described next.

Module 321 correction TTI defines the length of the time transmission interval (T), and transmits a certain length of time interval between the transmission of each module 302-1 to 302-NDprocessing of the data channels, the module 306 multiplexing module 320 settings characters. Length T can be set on the basis of information of a certain application, such as flow volume, based on the information about the base camp of the AI, such as bandwidth, and/or information about the type of services, such as unicast transmission, a multicast and broadcast transmission. The transmitter can transmit to the receiver data about a certain length of time interval for transmission through any of the control signals. For example, the length of the time interval of the transmission can be determined in the process of establishing the call connection.

Figure 4 presents (second) block diagram illustrating a transmitter according to one variant of implementation of the present invention. Figure 4 shows the node (module RF transmission), the next module 312 digital to analog conversion figure 3. Module RF transmission includes a module 402 orthogonal modulation, heterodyne 404, band-pass filter 406, the mixer 408, the local oscillator 410, a band-pass filter 412 and the amplifier 414 power.

The module 402 orthogonal modulation generates in-phase component (I) and quadrature component (Q) of the intermediate frequency of the incoming signal. Band-pass filter 406 removes the frequency component unnecessary for band intermediate frequency. The mixer 408 converts the intermediate frequency signal into a high frequency signal by a local oscillator 410 (up-conversion). The bandpass filter 412 removes unnecessary frequency component. Wuxi is ITIL 414 power increases the signal power for their radio antenna 416.

Flow data from the information processing module of the data in figure 1, pass encoding turbocodes 322, the modulation module 324 modulation data, the sorting module 326 alternation and conversion to parallel data in the module 328 series-parallel conversion. Similarly performs coding, modulation, interleaving, and sorting data information management. The data channels and the control channels are multiplexed for each subcarrier in module 306 multiplexing and modulated according to the OFDM module 308 inverse fast Fourier transform. Then the modulated signal is added guard interval to output the OFDM symbols in the main band of frequencies. The signal in the primary frequency band is converted into an analog signal. Next, the converted signal is orthogonal modulation module orthogonal modulation module radio frequency processing in Fig. 4. After limiting the frequency band is suitable reinforcement modulated signal and radio frequency transmission.

Figure 5 shows the block diagram of the receiver according to one variant of implementation of the present invention. Such a receiver, usually installed in the mobile station, but may also be present on the base station. The receiver includes ant the nnu 502, low noise amplifier 504, the mixer 506, the local oscillator 508, band-pass filter 510, the module 512 automatic gain control, an orthogonal detector 514, the local oscillator 516, module 518 analog-to-digital conversion, the detector 520 synchronization symbols, module 522 removal of the guard interval, the module 524 fast Fourier transform, the demultiplexer 526, module 528 channel estimation module 530 compensation channel module 532 parallel-serial conversion (P/S), the module 534 compensation channel module 536 correct rotation, turbocodes 538, the decoder 540 Viterbi module 542 settings, characters and module 544 correction TTI.

Low noise amplifier 504 appropriately amplifies the signal received through the antenna 502. The amplified signal is converted into a signal of intermediate frequency by mixer 506 and the local oscillator 508 (down conversion). Band-pass filter 510 removes unnecessary frequency component. Module 512 automatic gain control adjusts the gain of the amplifier to maintain the required signal level. The orthogonal detector 514 together with the local oscillator 516 performs orthogonal demodulation on the basis of the in-phase component (I) and quadrature component (Q) of the received signal. Module 518 analog-to-digital conversion converts the analog signal into a digital signal.

<> The detector 520 synchronization symbols determines the synchronization symbol (limit of characters) on the basis of the digital signal.

Module 522 delete removes the guard interval from the received signal component corresponding to the protective interval.

Module 524 fast Fourier transform performs a fast Fourier transform in relation to the incoming signal for demodulation in the OFDM scheme.

The demultiplexer 526 retrieves the pilot channel, control channels and data channels, multiplexed in the received signal. Used retrieval method corresponds to a method of multiplexing on the transmission side (the function module 306 multiplexing figure 3).

Module 528 channel estimation assesses the conditions of pathways on the basis of the pilot channels and delivers the control signal for the corresponding adjustment of the amplitude and phase of the compensating channel change. This control signal is supplied for each subcarrier.

Module 530 compensation channel adjusts the amplitude and phase of the data channel for each subcarrier in accordance with the information received from module 528 channel estimation.

Module 532 parallel-serial conversion (P/S) converts the parallel flows of signals in serial flow signal.

Module 534 compensation channel adjusts the amplitude and phase of the channel is in control for each subcarrier in accordance with the information coming from the module 528 channel estimation.

Module 536 correct rotation changes the order of the signals in accordance with a predetermined pattern. The predefined pattern is the reverse for sample rotation performed in the module rotation (326 figure 3) on the transmission side.

Module 537 demodulation data performs demodulation of the received signal for each time transmission interval according to the modulation scheme at the transmitter side.

Turbocodes 538 and the decoder 540 Viterbi perform decryption of the data stream of information and data control information, respectively.

Module 542 set the character set of symbols for use in the process of communication module 320 set the symbols on figure 3. Module 542 settings, characters can count and calculate the set of required parameters symbols for each case. In an alternative embodiment, the module 542 settings, characters beforehand can save a lot of sets of symbols and refer to them as needed. The principle of obtaining the parameters of the character described later.

Module 544 correction T defines the length of the time interval for transmission, and delivers a certain length of the time interval for transmission to the demultiplexer 526, module 536 eliminate h is redouane, module 537 demodulation data, turbodecoding 538, and the module 542 settings characters. The transmitter can transmit to the receiver data about a certain length of time interval for transmission through any of the control signals. For example, the length of the time interval of the transmission can be determined in the process of establishing the call connection.

The signal passed through the antenna is converted into a digital signal after passing through a number of operations in module RF receive, such as amplification, frequency conversion, the limitation of bandwidth and demodulation. Module 524 fast Fourier transform performs a demodulation signal from a remote interval guard interval in the OFDM scheme. The demodulated signal is divided into a pilot channel, control channels and data channels in a module 526 demuxing. Pilot channels are transmitted to the module 528 channel estimation, which, in turn, transmits the compensation signal to compensate for changes of the channel for each subcarrier. The data channels are compensated by the compensation signal for each subcarrier and is converted into a serial signal. The converted signal is stored in a module 526 correct rotation in accordance with a pattern reverse to the pattern of alternation in the module rotation, and is decrypted by turbodecoding 538. And the illogical way the control channels are compensated by the compensation signals and decrypted by a decoder 540 Viterbi. After that, the signal processing using the decoded data and control channels.

In Fig. 6 presents the data transfer process in accordance with the present embodiment. In this embodiment, there is no fixed time transmission interval (TTI) and can be used two types TT (long TTI and short TT), depending on environment connection. It should be noted that the frame length is kept constant to account for the requirements to guarantee backward compatibility with existing communication systems. In the present example, the long time interval of the transmission twice the short interval of time. For example, if the frame length is 10 MS, then the length of the short T equal to 0.5 MS, and the length of the long T equal to 1.0 MS. In case of a short TT one frame contains 20 TT, whereas in the case of long TT single frame contains only 10 TT. In Fig. 6 to simplify shows two types TT, but can be used more types T.

As described above, TT effect on various parameters of data transmission. For example, TTI defines parameters such as the identity element packet, the update frequency of the modulation scheme and data rate channel codero the project in the case of MCS, single element encoding with error correction and a single element of re-transmission in case of schemes ARQ (Automatic Repeat reQuest automatic repeat request), as well as the identity element of planning packages. The control channel contains the management information, such as information (MCS information retransmission and information planning, is used for demodulation of the data channel, so the control channel must be used along with the data channel during each TT. Longer TT allows you to reduce the frequency of making (distribution) control channel and to increase the effectiveness of knowledge transfer (see Fig.7).

This alternative implementation is also applicable if a wide frequency band is divided into multiple frequency blocks (or slices), and a single item of information transmission along the frequency axis represents the frequency block. In particular, if one user transmits data through multiple frequency blocks, the control channel may not be used for transmitting each fragment and used to transfer only one fragment (see Fig).

Flexible change of a single element in the transmission of information along the time axis and/or along the frequency axis to avoid unnecessary increase in the frequency of making (distribution) channel management and improve efficiency before the Chi information. Adjustment of the length T particularly advantageous in the case of relatively narrow bandwidth, because the narrow available bandwidth efficiency of transmission is directly related to the transmission delay (smfg).

The second option exercise

The following describes the parameter set of symbols and the method of their calculation module 320 (Fig 3) and 542 (figure 5) correction symbols. Each set of characters determines the interval of subcarriers, the frequency of the sampling period, the most significant component of the symbol period of the guard interval, the number of symbols in one frame (or one TT), the period of one TT etc. Should be noted that not all parameters can be set independently. For example, the interval of subcarriers and the period significant component of the symbol have an inverse relationship. In addition, the period T is calculated by multiplying the period of one symbol (full period equal to the sum of the guard interval and significant component of the symbol) on the number of characters. Below are three ways to obtain a second set of parameters symbols from the first set of characters.

First consider the case in which the first set of characters is selected as follows (Fig.9 (A)):

the interval of subcarriers = 22,5 kHz

the total number of subcarriers = 200

sampling rate = 5,76 MHz =3/2*3,84 MHz

period significant component symbol = 56 samples (44,4 ISS)

the period of the guard interval = 32 samples (5,5 ISS)

the period of one symbol = 288 samples (guard interval + significant component symbol)

loss factor = 32/288 = 11,1%

the number of symbols in one TTI = 10

the period of one T = 0.5 MS

the period of one frame = 10 MS

The loss factor represents the proportion of guard interval in a symbol. From the point of view of efficiency data guard interval is redundant component. The loss factor η period TGIguard interval and period Tffthe most significant component of the symbol related by the following ratio:

η=TGI/(TGI+Teff)×100 [%].

(1) the First method of calculation of a set of characters for reducing the number of characters in one TT and increasing the period guard interval at the unchanged interval of subcarriers. For example, if the first parameter set character sets 10 characters in one TT, the number of characters is reduced to 9. Then the period corresponding to one removed symbol (288 samples), is divided into 9 equal parts, which are individually assigned to a component of a guard interval. As a result, as shown in Fig. 9 (B), the period of most significant component of the character (256 samples) remains unchanged, but one TT contains 9 characters with longer periods protective interval is. The second set of characters obtained in this way has the following parameter values:

the interval of subcarriers = 22,5 kHz

the total number of subcarriers = 200

sampling rate = 5,76 MHz =3/2*3,84 MHz

period significant component symbol = 256 samples (44,4 ISS)

the period of the guard interval = 64 samples (11,1 ISS)

the period of one symbol = 320 samples

loss factor = 64/320 = 20%

the number of symbols in one TTI = 9

the period of one T = 0.5 MS

the period of one frame = 10 MS

According to the first method, if the number of characters in one TT reduced to 8, the second set of parameters of the characters has the following parameter values (Fig.9 (C)):

the interval of subcarriers = 22,5 kHz

the total number of subcarriers = 200

sampling rate = 5,76 MHz =3/2*3,84 MHz

period significant component symbol = 256 samples (44,4 ISS)

the period of the guard interval = 104 samples (18,1 ISS)

the period of one symbol = 360 samples

loss factor = 104/360 = 28,9%

the number of characters in one TT = 8

the period of one T = 0.5 MS

the period of one frame = 10 MS

In the future, through such operations can be obtained parameter sets of characters, with different amounts of characters in the same TT. In this case, the period of most significant component of the symbol is always maintained constant, and thus, can be maintained constant interval of subcarriers. Other with Awami, while in accordance with any one of the parameter sets of symbols obtained in the described manner, is determined by the same interval of subcarriers, the period of the guard interval and the number of characters change depending on the parameter set of characters.

(2) the Second method of calculation of a set of characters consists in changing the number of characters in one TT while maintaining a constant loss factor. As follows from the definition, to maintain the same loss factor the ratio of the value of guard interval and significant component of the symbol shall be maintained constant. For example, for the first set of characters, as shown in Fig. 9 (D)corresponding to the guard interval periods and significant component of the symbol are doubled, and, accordingly, the number of characters in one TT can be reduced to 5. In this case, the second set of characters has the following parameter values:

the interval of subcarriers = 11,25 (=22,5/2) kHz

the total number of subcarriers= 400 (=200*2)

sampling rate = 5,76 MHz =3/2*3,84 MHz

period significant component symbol = 512 (=256*2) samples (88,8 ISS)

the period of the guard interval = 64 (=32*2) sample (11,1 ISS)

the period of one symbol = 576 samples

loss factor = 64/576 = 11,1%

the number of symbols in one TTI = 5

the period of one T = 0.5 MS

the period of one frame = 10 MS

The AOC is e, for the first set of characters, as shown in Fig. 9 (E)corresponding to the guard interval periods and significant component of the symbol quadrupling, and, accordingly, the number of characters in one TT can be reduced to 2.5 characters. In this case, the second set of characters has the following parameter values. During this period one TT preferably extends from 0.5 MS, for example, up to 1.0 MS, then the number of characters placed in one TT becomes some integer:

the interval of subcarriers = 5,625 (=22,5/4) kHz

the total number of subcarriers= 800 (=200*4)

sampling rate = 5,76 MHz =3/2*3,84 MHz

period significant component symbol = 1024 (=256*4) sample (of 177.8 ISS)

the period of the guard interval = 128 (=32*4) samples (22,2 ISS)

the period of one symbol = 1152 samples

loss factor = 128/1152 = 11,1%

the number of characters in one TT = 2,5

the period of one T = 0.5 MS

the period of one frame = 10 MS

According to this method, can be maintained constant loss factor, which can be obtained parameter sets of characters with the same transmission efficiency. In the first method, in one TT included fewer characters, and the loss factor becomes higher.

(3) a Third method of obtaining the parameter sets of characters is a combination of the first method and second method. For example, the first ways which can be applied to the first set of symbols to obtain a second set of characters, a second method, in turn, can be applied to the second set of symbols to obtain a third set of characters. Assume that the application of the first solution to the first set of symbols leads to the creation of the second set of characters that defines the format of the symbol, as shown in Fig.9 (B). Then the loss factor for the second set of characters will be 64/320=20%. For the second set of characters changes the number of characters and the constant loss factor. For example, if the corresponding guard interval periods and significant component of the symbol is duplicated, you create a third set of characters with the following parameter values (figure 9 (F)):

the interval of subcarriers = 11,25 kHz

the total number of subcarriers = 400

sampling rate = 5,76 MHz =3/2*3,84 MHz

period significant component symbol = 512 samples (88,8 ISS)

the period of the guard interval = 128 samples (22,2 ISS)

the period of one symbol = 640 samples

loss factor = 128/640 = 20%

the number of characters in one TT = 4,5

the period of one T = 0.5 MS

the period of one frame = 10 MS

In addition, in this case, the period of one TT preferably extends, for example, up to 1.0 MS, then one TT may include an integer number of characters.

The third set of characters obtained is thus has the same loss rate (20%)as the set of characters shown in Fig 9 (B), and the same interval of subcarriers (of 11.25 kHz)as the set of characters shown in Fig.9 (D). It should be noted, however, that the period of the guard interval (128 samples) for the third parameter set of symbols is longer compared with other periods (64 samples) figure 9 (b) and 9 (D). Under the third method, it is possible to effectively obtain a set of characters with a predetermined relationship between the subcarrier interval and the loss factor. In addition, all parameter sets of the characters are based on the same sampling rate, so there is no need to change the clock frequency for each set of parameters.

Figure 10 shows several sample sets of characters in the case T = 0.5 MS. 9 sets of characters 8 sets of characters can be obtained by applying the first and/or second method to the first set of characters. According to this variant implementation, can be systematically and efficiently to get the sets of symbols with a predetermined relationship between the interval of subcarriers and the loss factor. In this embodiment, new sets of characters are created in such a way that the interval of subcarriers and num the characters can be reduced in comparison with the reference parameter set of characters. On the other hand, in other embodiments, the implementation of these new sets of characters can be created in such a way that the interval of subcarriers and the number of characters can be increased in comparison with the reference parameter set of characters.

A third option exercise

According to the first variant implementation, the system adjusts the length of the time interval (T). According to the second variant implementation, changing the length of the guard interval and/or significant component of the symbol. These implementation options can be used independently or in combination, as described below.

First, under 11 (A), suppose that the first set of symbol options are defined as follows. These values are similar to values in Fig.9 (A), except that the period of one TT expanded from 0.5 MS to 1.0 MS:

the interval of subcarriers = 22,5 kHz

the total number of subcarriers = 200

sampling rate = 5,76 MHz =3/2*3,84 MHz

period significant component symbol = 256 samples (44,4 ISS)

the period of the guard interval = 32 samples (5,5 ISS)

the period of one symbol = 288 samples (guard interval + significant component symbol)

loss factor = 32/288 = 11,1%

the number of characters in one TT = 20

the period of one T = 1.0 MS

the period of one frame = 10 MS

(1) According to the first method calc is the set of parameters symbols, you extend the period T, which reduces the number of characters in one TT and to increase the period guard interval at the unchanged interval of subcarriers. For example, if the first parameter set of characters currently contains 20 characters in one TT, the number of characters is reduced to 19. Then the period corresponding to one removed symbol (288 samples), is divided into 19 equal parts, which are individually assigned to a component of a guard interval. As a result, as shown in figure 11 (B), the period of most significant component of the character (256 samples) remains unchanged, but one TT contains 19 characters with longer periods of protection intervals. The second set of characters obtained in this way has the following parameter values:

the interval of subcarriers = 22,5 kHz

the total number of subcarriers = 200

sampling rate = 5,76 MHz =3/2*3,84 MHz

period significant component symbol = 256 samples (44,4 ISS)

the period of the guard interval = 47,16 sample (8,187 ISS)

the period of one symbol = 303 sample

loss factor = 47/303 = 15,5%

the number of characters in one TT = 19

the period of one T = 1.0 MS

the period of one frame = 10 MS

According to the first method, if the number of characters in one TT reduced to 18, the second set of characters has the following parameter values (11(C)):

the interval of subcarriers = 22,5 kHz

the total number of subcarriers = 200

sampling frequency = 5,76 MHz =3/2*3,84 MHz

period significant component symbol = 256 samples (44,4 ISS)

the period of the guard interval = 64 samples (11,1 ISS)

the period of one symbol = 320 samples

loss factor = 64/320 = 20,0%

the number of characters in one TT = 18

the period of one T = 1.0 MS

the period of one frame = 10 MS

In the future, through such operations can be obtained parameter sets of characters, with different amounts of characters in the same TT. In this case, the period of most significant component of the symbol is always maintained constant, and thus, can be maintained constant interval of subcarriers. In other words, while in accordance with any one of the parameter sets of symbols obtained in the described manner, is determined by the same interval of subcarriers, the period of the guard interval and the number of characters change depending on the set parameters characters. In the examples shown in Fig.9 (B), 9 (C), 11 (b) and 11 (C), the number of characters in one TT reduced by one or two characters, and the period corresponding to the removed symbol (symbols), evenly distributed over the components of a guard interval in the remaining characters. In the examples shown figure 11, the time interval of the transmission extends in two times in comparison with the time and what tervalon transmission in the examples shown in Fig.9. As a result, the loss factor equal to 20% in the example shown in Fig.9 (B), is reduced in the example of figure 11 (C) to 15.5%. Similarly, the loss factor, equal to 28.9% in the example shown in Fig.9 (C), is reduced in the example of figure 11 (C) to 20.0%. This increase length TT allows you to optimize the ratio of losses when using the first method according to the second variant implementation.

(2) the Second method of calculating the parameter set of symbols involves the extension period T and change the number of characters in one TT while maintaining a constant loss factor. As follows from the definition, to maintain the same loss factor the ratio of the value of guard interval and significant component of the symbol shall be maintained constant. For example, for the first set of characters, as shown in figure 11 (D)corresponding to the guard interval periods and significant component of the symbol are doubled, and, accordingly, the number of characters in one TT can be reduced to 10. In this case, the second set of parameter symbols have the following values:

the interval of subcarriers = 11,25 (=22,5/2) kHz

the total number of subcarriers= 400 (=200*2)

sampling rate = 5,76 MHz =3/2*3,84 MHz

period significant component symbol = 512 (=256*2) samples (88,8 ISS)

the period of the guard interval = 64 (=32*2) sample (11,1 ISS)

p is the period of one symbol = 576 samples

loss factor = 64/576 = 11,1%

the number of characters in one TT = 10

the period of one T = 1.0 MS

the period of one frame = 10 MS

In addition, for the first set of characters, as shown in figure 11 (E), guard interval and significant component of the symbol quadrupling, and, accordingly, the number of characters in one TT can be reduced to 5. In this case, the second set of parameter symbols have the following values:

the interval of subcarriers = 5,625 (=22,5/4) kHz

the total number of subcarriers= 800 (=200*4)

sampling rate = 5,76 MHz =3/2*3,84 MHz

period significant component symbol = 1024 (=256*4) sample (of 177.8 ISS)

the period of the guard interval = 128 (=32*4) samples (22,2 ISS)

the period of one symbol = 1152 samples

loss factor = 128/1152 = 11,1%

the number of characters in one TT = 5

the period of one T = 1.0 MS

the period of one frame = 10 MS

According to this method, can be maintained constant loss factor, which can be obtained parameter sets of characters with the same transmission efficiency. In the first method, in one TT included fewer characters and a loss factor accordingly becomes higher. The number of characters in one TT according to the example of figure 9 (E) equal to 2.5, however, figure 11 (E) the number of characters equal to 5. Thus, if during the implementation of the second variant implementation in one T VK is udaetsya a non-integer number of symbols, the increased length T, allows you to adjust the number of characters in one TT to an integer.

(3) the Third method of calculating the parameter set of characters is a combination of the first method and the second method with the extension of the period T. For example, the first method can be applied to the first set of symbols to obtain a second set of characters, while the second method, in turn, can be applied to the second set of symbols to obtain a third set of characters. Assume that the application of the first solution to the first set of symbols leads to the creation of the second set of characters that defines the format of the symbol, as shown in Fig. 11(B). Then the loss factor for the second set of characters will be 15.5 percent. For the second set of characters changes the number of characters and the constant loss factor. For example, if the corresponding guard interval periods and significant component of the symbol is duplicated, you create a third set of characters with the following parameter values (11 (F)):

the interval of subcarriers = 11,25 kHz

the total number of subcarriers = 400

sampling rate = 5,76 MHz =3/2*3,84 MHz

period significant component symbol = 512 samples (88,8 ISS)

the period of the guard interval = 94.3 choice and (16,37 ISS)

the period of one symbol = 606,3 samples

loss factor = 94,3/606,3 = 15,5%

the number of symbols in one frame (or TT) = 9

the period of one T = 1.0 MS

the period of one T = 10 MS

The third set of characters obtained in this way contains the same loss rate (15.5 per cent)as the set of characters shown in 11 (B), and the same interval of subcarriers (of 11.25 kHz)as the set of characters shown in Fig. 11 (D). It should be noted, however, that the period of the guard interval (94.3 per sample) for the third parameter set of characters is long compared with any of such periods figure 11 (b) and 11 (D). Under the third method, it is possible to effectively obtain the sets of symbols with a predetermined relationship between the interval of subcarriers and the loss factor. In addition, all parameter sets of the characters are based on the same sampling rate, so there is no need to change the clock frequency for each of the parameter sets. In addition, the number of symbols included in one TT, can be adjusted to an integer.

The above-described preferred embodiments of the present invention, but the present invention is not limited, and it can be various changes and modifications within the scope and meaning of the present invention. DL is ease of description the present invention has been described with the use of several specific embodiments. Note that this separation of embodiments irrelevant to the present invention, and, if necessary, can be used one or more embodiments.

The present international application claims priority based on patent application of Japan No. 2005-174396 filed June 14, 2005, the entire contents of which is hereby incorporated into this description by reference.

1. A mobile station that contains the module correction time interval, made with the ability to determine the time interval of transmission in which information is transmitted retransmission, with greater duration than the duration of the time interval for transmission, in which data is transmitted without information retransmission; and
a transmission module, configured to signal transmission in the direction of mobile station - base station in a time transmission interval whose duration is determined by the correction module of the transmission interval.

2. The base station containing the module the correction time interval, made with the ability to determine the time interval of transmission in which information is transmitted retransmission, with greater duration than the duration of the time interval for transmission, in which data is transmitted without information re-transfer and; and
a transmission module, configured to send the mobile station a control signal indicating a time interval of transmission of greater duration, a specific module correction time interval for transmission.



 

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