RU2414072C2 - Transmitting apparatus, receiving apparatus, mobile communication system and transmission control method - Google Patents

Abstract

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

Description

FIELD OF THE INVENTION

The present invention relates to a transmitting device, a receiving device, a communication system and a method for controlling signal transmission.

State of the art

A fourth generation (4G) mobile communication method is being developed, which is the next generation of the IMT-2000 standard (International Mobile Telecommunications 2000). The fourth generation (4G) method is intended to provide flexible support for a variety of environments, from multi-cell environments including cellular systems to an isolated cell environment, such as access point coverage areas and indoor areas, and will increase frequency efficiency in both types of cellular environments.

The following radio access methods have been proposed in the fourth generation communication methods for connecting a mobile station to a base station (hereinafter referred to as “uplink”). As transmission methods with a single carrier, for example, a DS-CDMA (Direct Sequence Code Division Multiple Access, Code Division Multiple Access), IFDMA (Interleaved Frequency Division Multiple Access, Channel Division Multiple Access) method has been proposed. frequency with alternation) and the method of VSCRF-CDMA (Variable Spreading and Chip Repetition Factors-CDMA, CDMA with variable coefficients of the expansion of the spectrum and the repetition of elementary signals). OFDM (Orthogonal Frequency Division Multiplexing), Spread OFDM (OFDM), MC-CDMA (Multi-Carrier Code Division Multiple Access, Code Division Multiple Access) have been proposed as multi-carrier transmission methods. and multiple carriers) and VSF-Spread OFDM (Variable Spreading Factor Spread OFDM - Variable Spread Spectrum OFDM).

Single carrier transmission methods have high performance because the peak power value in them is lower from the point of view of power consumption by the terminal, which reduces the time interval before retransmission by the amplifier of the transmission power after an unsuccessful attempt.

As an example of a single-carrier method, the following is a description of the VSCRF-CDMA method with reference to FIG. 1 (see Patent Document 1).

The spreading module 1 includes a code multiplication module 2, a multiple synthesis module 8 connected to a code multiplication module 2, and a phase shift module 10 connected to the multiple synthesis module 8.

Module 2 multiplication by code multiplies the transmitted signal by the extension code. For example, a multiplier 4 multiplies the transmitted signal by a channel code determined in accordance with a predetermined spreading code coefficient SF. In addition, a multiplier 6 multiplies the transmitted signal by a scrambling code.

Multiple synthesis module 8 compresses the spread-spectrum signal in time and repeats the elementary signal in a predetermined number of times (CRF times). The transmitted signal to which the repetition operation was applied has a comb-like frequency spectrum. If the number of repetitions is one, the multiple synthesis unit 8 has the same configuration and performs the same functions as in the conventional DS-CDMA method.

The phase shift module 10 rejects (or shifts) the phase of the transmitted signal at a predetermined frequency, the value of which is individually determined for each mobile station.

If the CRF value in the VSCRF-CDMA method is greater than 1, for example 4, then the comb-like spectrum used by each of the users is distributed over the entire frequency band, as shown in FIG. 2A. In this case, the frequency shift defined for each user is less than the allocated frequency bandwidth.

On the other hand, if the CRF value is 1, the spectrum used by each of the users is located in one block, as shown in FIG. 2B. In this case, the frequency shift defined for each user is greater than the allocated frequency band.

In addition, an access method using radio communication has been proposed in which a comb-like frequency spectrum is obtained in the frequency domain (see Non-Patent Documents 1, 2).

As shown in FIG. 3, the transmitter 30, which is accessed using radio communications, comprises an FFT (Fast Fourier Transform) module 12, into which a spread spectrum data sequence is input, a transmission rate conversion module 14 connected to the FFT module 12, a frequency domain signal generation module 16 connected to a transmission rate conversion module 14, an inverse FFT module 18 connected to a frequency domain signal generation module 16, a guard interval adding module 20 s connected to the IFFT unit 18, and filter 22 coupled to unit 20 adding guard intervals.

The fast Fourier transform module (FFT) 12 divides every Q elementary signals of the spread spectrum data into blocks and performs a fast Fourier transform, thus translating the blocks into the frequency domain. As a result, Q signals with one carrier are obtained in the frequency domain. In this case, the spread spectrum data sequence corresponds to the output of the multiplier 6 of the spectrum spreading module 1 of FIG. 1.

The baud rate conversion unit 14 repeats Q signals with one carrier in a predetermined number of times, for example CRF times. As a result, the number of generated signals with one carrier is N _sub = Q × CRF.

The signal generation module 16 in the frequency domain shifts each of the signals from one carrier along the frequency axis so that the spectrum acquires a comb-like shape. For example, when performing an operation corresponding to CRF = 4, three zeros are inserted between each signal with one carrier. As a result, a comb-like frequency spectrum is described, described with reference to FIGS. 2A and 2B.

The inverse FFT module 18 performs the inverse fast Fourier transform of the comb-shaped spectrum obtained by shifting each of the signals from one carrier along the frequency axis.

The guard interval adding module 20 adds guard intervals to the signal to be transmitted. Guard intervals are obtained by reproducing the top or end of each transmitted symbol. Filter 22 limits the bandwidth of the transmitted signal.

On the other hand, a multi-carrier method that uses long characters can provide higher quality reception in a multipath environment by using guard intervals.

As an example, an OFDM method is described below with reference to FIG. 4.

Figure 4 shows a block diagram of a transmitting module used in the transmitting device of the OFDM method.

The transmitting module 40 includes a series-parallel (S / P) conversion module 32, a subcarrier distribution module 34 connected to the S / P conversion module 32, an inverse FFT module 36 connected to the subcarrier distribution module 34, and guard interval adding module 38, connected to the inverse FFT module 36.

The serial-parallel (S / P) conversion module 32 converts the serial signal sequences into parallel signal sequences.

The subcarrier allocation unit 34 assigns to each subcarrier a signal converted in a serial to parallel conversion unit 32 to a parallel signal sequence. For example, subcarrier allocation module 34 assigns separate subcarriers to each of the users, as shown in FIG. 5A, to achieve a frequency diversity effect. In addition, as shown in FIG. 5B, the subcarrier allocation module 34 assigns successive spaced subcarriers to each of the users.

The inverse FFT module 36 performs an inverse fast Fourier transform of the input signal so as to provide OFDM modulation.

Guard interval adding module 38 adds guard intervals to the signal to be transmitted and generates an OFDM method symbol.

Patent Publication No. 1: Japanese Patent Application Laid-Open Publication No. 2004-297756.

Non-Patent Publication No. 1: M. Schnell, I. Broeck and U. Sorger, "A promising new wideband multiple-access scheme for future mobile communication," European Trans. on Telecommunication. (ETT), vol. 10, no. 4, pp. 417-427, July / Aug. 1999.

Non-Patent Publication No. 2: R. Dinis, D. Falconer, S.T. Lam and M. Sabbaghian, "A Multiple Access Scheme for the Uplink of Broadband Wireless Systems", Proc. Globecom 2004, Dec. 2004.

However, the above-described prior art solutions have the following disadvantages.

Single carrier methods are accompanied by degradation in reception quality caused by multipath interference, especially in cases where signals are transmitted at high speed due to the use of short symbols.

Furthermore, a multi-carrier method requiring a longer time interval before retransmission after an unsuccessful attempt, since the peak power becomes large with respect to the power consumed by the terminal, has a problem of lower energy efficiency.

Disclosure of invention

The present invention is directed to the proposal of a transmitting device, a receiving device, a mobile communication system and a signal transmission method that enable switching between a single-carrier radio communication method and a multi-carrier radio communication method.

To eliminate these drawbacks, a transmitter used in a single-carrier communication system and in a multi-carrier communication system, in accordance with one embodiment of the present invention, includes a switching module for switching radio communication methods; a signal generation module in the frequency domain, which allocates radio resources for a sequence of elementary signals with a spread spectrum, over which one of the following transformations is carried out: fast Fourier transform and serial-parallel conversion, in accordance with the applied radio communication method, for generating a signal in the frequency domain; and a transmission signal generating unit, performing inverse fast Fourier transform of the signal in the frequency domain to generate the transmission signal.

In this configuration, the method of exchanging information with one carrier and the method of exchanging information with multiple carriers are carried out in a single module and the exchange of information is carried out using both communication methods.

In addition, the receiving device according to one embodiment of the invention comprises a radio communication method determination module defining a radio communication method used by the transmitting device, and a reporting module that reports a specific radio communication method.

This configuration provides a definition of the radio communication method used by the transmitting device, and reporting a specific radio communication method.

In addition, a mobile communication system comprising a receiver and a transmitter used in a communication system using a single-carrier method and in a communication system using a multi-carrier method, in accordance with one embodiment of the present invention, comprises a module for determining a radio communication method, a determining radio method used by the transmitting device; a reporting module reporting information about a particular applicable radio communication method; a switching module switching the radio communication method; a signal generation module in the frequency domain that allocates radio resources for a sequence of spread spectrum chips that performs one of the following transformations: fast Fourier transform and series-parallel conversion, depending on the radio method used, to generate a signal in the frequency domain; and a transmission signal generating unit, performing inverse fast Fourier transform of the signal in the frequency domain to generate the transmission signal.

In this configuration, the method of exchanging information with one carrier and the method of exchanging information with multiple carriers are implemented in a single module, which allows for the exchange of information using both communication methods.

In addition, the method of controlling signal transmission in accordance with one embodiment of the invention includes a step in which the receiving device determines the applicable radio communication method; the step at which the receiving device reports information about a particular radio communication method; the step at which the transmitting device receives information about the radio communication method; a step in which the transmitting device switches the radio communication method in accordance with the information on the radio communication method; a step in which the transmitting device allocates radio resources for a sequence of spread spectrum chips to which one of the following transforms is applied: fast Fourier transform and series-parallel transform, to generate a signal in the frequency domain; and a step in which the transmitting device performs the inverse fast Fourier transform of the signal in the frequency domain to generate a transmission signal.

This method allows the use of a single-carrier method and a multi-carrier method for exchanging information in accordance with a particular radio communication method.

In accordance with embodiments of the present invention, there is provided a transmitter, a receiver, a mobile communication system and a signal transmission method in which it is possible to switch between a single-carrier radio communication method and a multi-carrier radio communication method.

Brief Description of the Drawings

Figure 1 presents a block diagram of a spreading module used in a transmitter based on the VACRF-CDMA method.

2A illustrates an example of a frequency spectrum of a transmission signal of a mobile station.

2B illustrates an example of a frequency spectrum of a transmission signal of a mobile station.

Figure 3 presents a block diagram of a transmitting device transmitting with a single carrier.

Figure 4 presents a block diagram of a transmitting device transmitting with a single carrier.

5A illustrates an example of a frequency spectrum of a transmission signal of a mobile station.

5B illustrates an example of a frequency spectrum of a transmission signal of a mobile station.

6A illustrates the structure of a cellular communication environment.

Figv illustrates the structure of the environment of the local communication zone.

Figure 7 presents a partial block diagram of a transmitting device according to one embodiment of the present invention.

FIG. 8 illustrates a switch between a single carrier method and a multi-carrier method.

9 illustrates a switch between a single-carrier method and a multi-carrier method.

10 illustrates a switch between a single-carrier method and a multi-carrier method.

11 illustrates a method for transmitting an uplink channel state.

12A illustrates a request for a requested maximum transmission channel bandwidth of a data channel and pilot.

12B illustrates the expected SINR of the reception of the channel state measurement signal during transmission with maximum transmit power.

12C illustrates the adjustment of transmit power in the case when the data channel is not allocated, but transmit only a signal measuring the state of the channel.

12D illustrates the adjustment of transmit power in the case where a data channel is allocated.

12E illustrates one embodiment of adjusting the transmit power of a channel state measurement signal when a data channel is allocated.

12F illustrates one embodiment of adjusting the transmit power of a channel state measurement signal when a data channel is allocated.

13 illustrates data channel scheduling in a multiplexed channel.

Fig. 14 illustrates data channel scheduling in a multiplexed channel.

15 illustrates interference from other mobile stations.

Figa illustrates fluctuations in interference power.

Figv illustrates fluctuations in interference power.

17 illustrates data channel scheduling in a multiplexed channel.

Fig. 18 illustrates data channel scheduling in a multiplexed channel.

19A illustrates data channel scheduling in a multiplexed channel.

19B illustrates data channel scheduling in a multiplexed channel.

20A illustrates radio resource allocation in a transmitter according to one embodiment of the present invention.

FIG. 20B illustrates radio resource allocation in a transmitter according to one embodiment of the present invention.

20C illustrates radio resource allocation in a transmitter according to one embodiment of the present invention.

On Fig presents a partial block diagram of a receiving device according to one embodiment of the present invention.

On Fig presents a partial block diagram of a receiving device according to one of the embodiments of the present invention.

23A illustrates measurements of a SINR of a pilot signal transmitted by each of the mobile stations at a receiver according to one embodiment of the present invention.

23B illustrates measurements of a SINR of a pilot signal transmitted by each of the mobile stations at a receiver according to one embodiment of the present invention.

Figa illustrates the allocation of a mobile frequency station for transmitting a data channel in a receiving device according to one embodiment of the present invention.

24B illustrates frequency allocation for transmitting a data channel of a mobile station in a receiver according to one embodiment of the present invention.

Figa illustrates the allocation of a mobile frequency station for transmitting a data channel in a receiver according to one embodiment of the present invention.

Figv illustrates the allocation of a mobile frequency station for transmitting a data channel in a receiver according to one embodiment of the present invention.

25C illustrates the allocation of a frequency mobile station for transmitting a data channel at a receiver in accordance with one embodiment of the present invention.

Fig.26 illustrates the re-allocation of the frequency band.

27A illustrates determination of transmit power.

Figv illustrates the determination of transmit power.

Figa illustrates the determination of transmit power.

Figv illustrates the determination of transmit power.

29 illustrates the assignment of an MCS value during a data channel transmission of a mobile station to which transmission is allowed.

On Fig presents a partial block diagram of a receiving device according to one of the embodiments of the present invention.

Fig. 31 illustrates the assignment of a width and a center frequency of a frequency band for a pilot signal of each of the mobile stations in a receiver according to one embodiment of the present invention.

Fig. 32 illustrates the assignment of the width and center frequency of the frequency band for the pilot signal of each of the mobile stations in the receiver according to one embodiment of the present invention.

Figa illustrates the assignment of the width and center frequency of the frequency band for the control signal of each of the mobile stations in the receiving device according to one embodiment of the present invention.

Figv illustrates the assignment of the width and center frequency of the frequency band for the control signal of each of the mobile stations in the receiving device according to one embodiment of the present invention.

Fig. 34 illustrates a SINR of a pilot signal received by each of the mobile stations at a receiver according to one embodiment of the present invention.

Fig. 35 illustrates the assignment of an MCS value during a data channel transmission of a mobile station that is allowed to transmit at a receiver in one embodiment of the present invention.

Fig. 36 is a flowchart illustrating an operation of a transmitter in one embodiment of the present invention.

37 is a flowchart illustrating an operation of a receiving device according to one embodiment of the present invention.

FIG. 38 is a flowchart illustrating an operation of a mobile communication system according to an embodiment of the present invention.

Legend List

one: spectrum expansion module 2: code multiplication module 3: phase shift modulus 30.40, 100 transmitting device 200, 200 ₁ , 200 ₂ , 200 ₃ , 200 ₄ , 200 ₅ , 200 ₆ : base station 300: mobile station 400: receiving device

The implementation of the invention

An optimal embodiment of the invention is described below with reference to the accompanying drawings based on the following examples.

In all the drawings shown to illustrate examples, parts or components that perform similar functions are denoted by the same numbers, and overly repeated descriptions are omitted.

A mobile communication system according to one embodiment of the present invention comprises a mobile station and a base station capable of radio communication with the mobile station.

The following is a description of a transmitter in accordance with one embodiment of the present invention.

A transmitting device provided, for example, as part of a mobile station, transmits on the uplink.

The transmitter of this embodiment is used in cellular communication systems and in local communication systems.

As shown in FIG. 6A, a cellular communication system comprises base stations covering individual cells (sectors), for example, base stations 200 ₁ , 200 ₂ , 200 ₃ , 200 ₄ and 200 ₆ , and a mobile station 300 capable of exchanging information with the base station 200 ₁ through radio channels. A cellular communication system has a larger cell radius and higher mobile station power than a local communication system. However, the achievable data rate in the cellular communication system is lower due to the interference of neighboring cells.

Therefore, the use of the single-carrier method as a radio communication method in a cellular communication system has advantages over the use of the multi-carrier method.

On the other hand, a local communication system, for example, operating within the same building or representing a communication system of a wireless access point, comprises a base station covering one cell (sector), for example, a base station 200 ₆ , and a mobile station 300 capable of exchanging information with base station 200 ₆ on radio channels. The local communication system has a smaller cell radius and lower power consumed by the mobile station than the cellular communication system. However, the achievable data rate in the local communication system is comparatively higher.

Therefore, the use of a multi-carrier method as a radio communication method in a local communication system has advantages over the use of a single-carrier method.

Next, with reference to FIG. 7, a transmitter in accordance with this embodiment of the invention is described.

The transmitting device 100 comprises a spreading and channel coding unit 102, into which symbol sequences are input, a switching unit 106 connected to a spreading and channel coding unit 102, a fast Fourier transform (FFT) module 108 and a serial-parallel (S / P) module 110 ) conversions connected to the switching module 106, and the transmission rate conversion module 112 connected to the FFT module 108 and the S / P conversion module 110.

In addition, the transmitting device 100 according to this embodiment of the invention comprises a frequency domain signal generation module 114 connected to a transmission rate conversion module 112, an inverse FFT module 116 connected to a frequency domain signal generation module 114, a guard interval adding module 118 connected with an inverse FFT module 116, and a filter 120 connected to the guard interval adding module 118.

In addition, the transmitting device 100 according to this embodiment of the invention includes a module 104 for modulating data / degree of spreading / channel coding, coupled to module 102 for spreading the spectrum and channel coding and module 114 for generating signals in the frequency domain, and module 122 for managing radio resource allocation connected to the signal generation module 114 in the frequency domain. The switching module 106 is connected to the filter 120.

Modulation and Coding Scheme (MCS) information for each user is inputted to a modulation / spreading / channel coding control module 104. Radio communication resource allocation control module 122 introduces radio resource allocation notification information for each physical channel and scheduling information for each user.

The module 104 for modulating the data / degree of spreading of the spectrum / channel coding determines the degree of spreading of the spectrum of the orthogonal codes used in the module 102 of spreading the spectrum and channel coding, and outputs orthogonal codes of a certain degree of spreading of the spectrum and the scrambling code for this cell, as well as the entered MCS information for each user, to the module 102 spread spectrum and channel coding.

For example, in a cellular communication system, the module 104 for modulating the data / degree of spreading of the spectrum / channel coding determines an orthogonal code for the degree of spreading of the spectrum corresponding to a given cellular communication system and a scrambling code for a given cell. On the other hand, in the local communication system, the module 104 for modulating data / degree of spreading / channel coding control determines an orthogonal code for the spreading degree corresponding to a given local communication system and a scrambling code for a given cell. In addition, the module 104 controls the modulation of the data / the degree of spread of the spectrum / channel coding transmits the number of sets of subcarriers to the module 114 of the formation of signals in the frequency domain.

The spread spectrum and channel coding module 102 performs channel coding by applying an error correction code, for example, a turbo code or a convolution code, to the input binary information sequence in accordance with the input MCS information and thus modulates the data subjected to channel coding. In addition, the spread spectrum and channel coding module 102 generates a spread spectrum chip by applying the spread spectrum operation using the input orthogonal codes and a scrambling code for a given cell, and then outputs the spread spectrum chip sequence to the switching module 106.

The switching module 106 determines whether the information received from the base station 200 and determining the applicable radio communication method corresponds to a single-carrier or multiple-carrier method. If the switching module 106 determines that the received information about the applicable radio communication method corresponds to the single-carrier method, then the switching module 106 transmits an input sequence of spread-spectrum chips to the FFT module 108. If the switching module 106 determines that the received information about the applicable radio communication method corresponds to the multi-carrier method, then the switching module 106 transmits the input spread spectrum signal to the S / P conversion module 110. In addition, the switching module 106 transmits the received information about the applied method of radio communication to the filter 120.

For example, the switching module 106 may determine the applicable radio communication method from the notification information from the base station 200. In this case, as shown in FIG. 8, the base station 200 determines in the radio communication method determination module 402 (described below) whether each user is allowed to use ( mobile station) of a method with one carrier or multiple carriers, and transmits control information about the results of determining the applicable radio communication method of the mobile station 300.

In addition, the switching module 106 may determine whether a single-carrier or multi-carrier method is applied, for example, in accordance with a radio communication method established for each cell. In this case, the radio communication method determination module 402 of the receiver provided in the base station 200 determines in advance for each base station a permanent uplink radio communication method in accordance with the cell configuration.

For example, the radio communication method determination module 402 may determine the applicable radio communication method when installing the base station 200 in accordance with the configuration of the cell, for example, by the radius of the cell, the presence or absence of neighboring cells, and the like. For example, if the radius of the cell is large, a single carrier method may be used, and if the radius of the cell is small, a multi-carrier method. As shown in FIG. 9, the radio communication method determination module 402 transmits information about the applied radio communication method to the mobile station 300 as general control information for all users.

In accordance with the foregoing, the applicable radio communication method is determined when installing the base station, which leads to simplification of configuration and management.

In addition, the switching module 106 may determine the applicable radio communication method (with one or multiple carriers), for example, in accordance with the radio communication method established for each user (mobile station). In this case, it is possible to switch from one radio communication method to another in accordance with the distance between each of the users and the base station or with the transmit power reserve for each user.

For example, if the used communication method is changed depending on the distance between each of the users and the base station 200, for example, the amount of loss in the transmission path can be used as a value determining the distance between the user and the base station 200. In this case, the mobile station 300 measures the losses in the downlink path by the power of the received downlink pilot signal and transmits information about the measured value of the losses in the transmission path of the base station 200 through the uplink.

If the resulting loss in the transmission path is greater than a predetermined threshold value, then the radio communication method determination module 402 of the receiving device provided in the base station 200 determines that the distance between the base station 200 and the mobile station 300 is large and determines whether to use the radio communication method with one carrier. Then, as shown in FIG. 10, the radio communication method determination module 402 notifies the mobile station 300 of the need to use the single-carrier radio communication method as general control information addressed to this user.

If the obtained value of the losses in the transmission path is less than a predetermined threshold value, then the module 402 for determining the radio communication method of the receiving device provided in the base station 200 determines that the distance between the base station 200 and the mobile station 300 is small and determines the necessity of applying the radio communication method with many carriers. Then, as shown in FIG. 10, the radio communication method determination module 402 notifies the mobile station 300 of the need to use the multi-carrier radio communication method as general control information addressed to this user.

Thus, the applicable radio communication method is set for each mobile station in accordance with the distance between the base station and this mobile station.

In addition, mobile stations can determine the need for a single-carrier or multiple-carrier radio communication method in accordance with the measured loss in the transmission path and report the result to the base station 200.

In addition, if switching from one communication method to another is carried out in accordance with the transmit power margin of each user, then, for example, the difference between the maximum allowable transmit power and the current transmit power can be used as a value determining the transmit power margin for each user. In this case, each of the mobile stations transmits to the base station a difference value between the maximum allowable transmit power and the current transmit power.

If the difference between the maximum allowable transmit power and the current transmit power is less than a predetermined threshold value, then the radio communication method determination module 402 of the receiving device provided in the base station 200 determines that the transmit power margin is small and determines whether to use a single-carrier radio communication method . Then, as shown in FIG. 10, the radio communication method determination module 402 transmits the corresponding information to the mobile station 300.

If the difference between the maximum allowable transmit power and the current transmit power is greater than a predetermined threshold value, then the radio communication method determination module 402 of the receiving device provided in the base station 200 determines that the transmit power margin is large and determines whether to use a radio communication method with multiple bearing. Then, as shown in FIG. 10, the radio communication method determination module 402 notifies the mobile station 300 of the need to apply the multi-carrier radio communication method.

In accordance with the foregoing, control of radio communication methods is carried out in accordance with the performance of each of the mobile stations.

In addition, mobile stations 300 may transmit information on the maximum allowable transmit power and information on the current transmit power. In this case, the module 402 determine the radio communication method of the receiving device provided in the base station 200, can calculate the difference between the maximum allowable transmit power and the current transmit power and set the applicable radio communication methods in accordance with the calculated value.

In addition, mobile stations can determine the need for a single-carrier or multiple-carrier method in accordance with the transmit power headroom and report the result to base station 200.

In addition, as shown in FIG. 11, the switching module 106 may transmit a channel state measurement signal, for example, as a pilot signal, using a predetermined frequency band allocated on a special request, in accordance with a radio communication method defined for each user (mobile stations). For example, the switching module 106 may transmit a channel state measurement signal using only one frequency band allocated from the frequency band provided to the system. In particular, if the system is provided with a frequency band with a width of, for example, 20 MHz, the mobile stations (transmitting devices) are divided into classes of mobile stations that can use the bands with a width of 20 MHz, 10 MHz and 5 MHz. In this case, the switching module 106 transmits a channel state measurement signal using only a frequency band corresponding to a given class of mobile stations (transmitting devices), in accordance with a radio communication method defined for a given user (mobile station).

The radio resource allocation determination unit 404 of the receiving device 400 allocates to the mobile station (transmitting device) to which the channel state measuring signal is transmitted, a frequency band in accordance with the frequency band used to transmit the channel state measuring signal.

In particular, each of the mobile stations (transmitting devices) transmits a control signal, and the base station (receiving device) measures the control signals and, therefore, the state of the channel between the base station and mobile stations, thereby allocating frequency bands. Mobile stations do not need to transmit control signals using the entire frequency band allocated to the system. Instead, mobile stations can transmit pilot signals using predetermined frequency bands. The base station receives pilot signals from all users and allocates frequency bands if there are frequency bands in the range of frequency bands that can be allocated. The base station then transmits information about certain frequency bands to the transmitting devices.

In addition, the receiving device 400 may determine in the module 420 determine the method of radio frequency bands used to transmit the signal measuring the status of the channel, and, thus, transmit information about the frequency bands.

In addition, the switching module 106 may include a pilot signal generating module that transmits information to the base station about at least one of the following parameters: the requested (maximum) bandwidth for transmitting the data channel, the size of the data to be transmitted, or the speed data transmission, in accordance with the communication method established for each user (mobile station), if the specific radio communication method is a single-carrier method. In addition, the pilot signal generation module may transmit information about the requested (maximum) bandwidth for transmitting the pilot signal of the base station.

For example, the control signal generation module can transmit information to the base station about at least one of the following parameters: the requested (maximum) bandwidth for transmitting the control signal, the size of the data to be transmitted, or the data transfer rate over the channel allocated on a competitive basis. Suppose, for example, that the maximum bandwidth is 5 MHz and the requested bandwidth is less than 5 MHz.

As shown in FIG. 12A, it is assumed that W_able is the maximum bandwidth that can be used by the mobile station, Wp_req is the requested maximum bandwidth for transmitting the pilot, and Wd_req is the requested maximum bandwidth for transmitting the data channel. The pilot generation module sets the value of Wd_req within the limits of Wd_req≤W_able taking into account the size of the transmitted data and the data rate. In addition, the pilot signal generating unit sets the value Wp_req within the range of Wd_req≤Wp_req≤W_able.

The switching module 106 may determine that the bandwidth for transmitting the channel state measurement signal is an integer multiple of the minimum bandwidth defined in the system, or twice the minimum bandwidth defined in the system.

In this case, the switching module 106 transmits using the widest possible frequency band in which the expected value of the signal-to-interference-to-noise-ratio (SINR) of the reception during transmission with the maximum transmit power or with the “maximum power minus ΔP” can be greater than the required receive SINR . For example, the switching module 106 may calculate the expected SINR value of the reception from the average interference power at the base station and the average path loss between the base station (receiver) and the mobile station (transmitter).

For example, if, as shown in FIG. 12B, the maximum transmission bandwidth is 5 MHz and the minimum transmission bandwidth is 1.25 MHz, then if you select from the transmission frequency bands equal to 1.25 MHz, 2.5 MHz and 3.75 MHz, the frequency bands providing the desired SINR for receiving the channel state measurement signal are 1.25 MHz and 2.5 MHz. Therefore, the maximum bandwidth that exceeds the required SINR of reception is 2.5 MHz.

In this case, even if the desired reception SINR is not expected to be achieved in the case of transmission using the minimum transmission bandwidth, the used transmission band does not already become the minimum transmission bandwidth, and transmission is performed using the minimum transmission bandwidth.

The desired SINR of the reception of the channel state measurement signal is distributed over the broadcast channel throughout the cell.

In addition, the switching module 106 may set the quality requirements for the channel state measurement signal different from the quality requirements for the data channel, for example, in the form of a desired receive SINR.

In this case, the base station device transmits information about the quality requirements through the broadcast channel to the mobile stations under the control of this sector. For example, a base station device can transmit information about the quality requirements of a data channel over a dedicated control channel.

The switching module 106 adjusts the transmit power in accordance with the quality requirements of the channel state measurement signal when the data channel has not yet been allocated. For example, the switching module 106 may transmit with a transmit power set by adjusting the transmit power in accordance with the transmission quality requirements of the pilot signal. For example, the switching module 106 may set a lower limit of the required quality necessary and sufficient to measure the state of the channel, as shown in FIG. 12C. At the same time, interference with control signals is reduced, which increases the throughput of the system as a whole.

The switching module 106 adjusts the transmit power for the data and for the channel state measurement signal in accordance with the quality requirements of the data channel when allocating the data channel. For example, as shown in FIG. 12D, the switching module 106 may transmit with the same power as when transmitting data while allocating a data channel. In this case, higher quality requirements are set for data transmission, since they use a highly efficient modulation method and / or degree of coding. The switching module 106 transmits a pilot signal with a higher transmit power, since an accurate estimate of the channel condition is required.

In particular, if the data channel is allocated and the frequency band allocated for the data channel is narrower than the frequency band for transmitting the channel state measurement signal, the switching module 106 adjusts the transmit power of the channel state measurement signal so as to meet the quality requirements for the data channel for example, with respect to a reception bandwidth SINR for transmitting a channel state measurement signal, as shown in FIG. 12E.

If the transmit power margin is insufficient to provide the required quality, the switching module 106 sets the maximum transmit power, as shown in FIG. 12F.

The base station 200 has a center carrier frequency and a transmission frequency band (bandwidth) of a pilot signal transmitted by the mobile station according to information transmitted by the mobile station, for example, according to the requested (maximum) bandwidth, and reports information about a specific center frequency and information about a certain bandwidth of the control signal to mobile stations.

The pilot signal generating module transmits the pilot signal in accordance with the reported center frequency information and the transmitted pilot bandwidth information. In addition, if the identifier of the frequency block has been communicated, the pilot signal generating unit transmits the pilot signal in accordance with the frequency bandwidth and center frequency determined by the reported identifier of the frequency block. In this case, the pilot signal generation module may transmit the pilot signal using a frequency hopping method. In addition, the pilot signal generating module can transmit the pilot signal in a frequency hopping manner, alternately using each of the allocated frequency bands to transmit.

The FFT module 108 splits the spread spectrum data into blocks of Q chips, performs a fast Fourier transform to convert the split sequence to the frequency domain, and outputs the converted split sequence to the bit rate conversion module 112. As a result, Q signals with one carrier are obtained in the frequency domain.

The serial-parallel (S / P) conversion module 110 converts the signal sequences (stream) into multiple parallel signal sequences, and then outputs the parallel signal sequences to the bit rate conversion module 112.

The baud rate conversion module 112 repeats Q single-carrier signals from the FFT module 108 a predetermined number of times, for example, equal to a chip repetition coefficient (CRF). The number of resulting single-carrier signals is N _sub = Q × CRF. In addition, the transmission rate conversion module 112 outputs Q parallel sequences of signals from the serial-parallel (S / P) conversion module 110 to the signal generation module 114 in the frequency domain.

On the other hand, the radio resource allocation control unit 122 controls the time and frequency blocks allocated to each of the physical channels in accordance with the resource allocation information to each of the physical channels reported by the base station 200 and the communication scheduling results for each of the users.

In addition, the radio resource allocation control module 122 determines a radio resource allocation for a period based on a time scale of the Transmission Time Interval (TTI) of the frequency blocks if frequency blocks and time are allocated to each of the physical channels.

Next, with reference to FIGS. 13 and 14, a description will be made of planning the use of multiplexed data channels. Multiplex data channels are allocated in accordance with scheduling performed at base station 200, as described below.

Frequency blocks are allocated according to scheduling control information in the time domain when communicating with frequency multiplexing under the condition of stable frequency allocation, as shown in FIG. 13. In this case, a user with a high data transfer rate is allocated a plurality of frequency blocks, which allows each user to use only the frequency blocks allocated in advance. Thus, the transmitter 100 does not have to transmit control signals transmitted at other frequency blocks in advance so that the receiver 400 can measure the Channel Quality Indicator (CQI).

Let, for example, the optimal bandwidth for the frequency block is from 1.25 to 5 MHz. The extension of the frequency band for the frequency block can provide an enhancement of the diversity effect of multiple users within the frequency block.

When transmitting with a single carrier, the bandwidth allocated to each user may vary in accordance with the data rate.

In addition, if the graph volume of any user exceeds the size of the payload of the frequency block, one of the frequency blocks can be used exclusively by one user.

Many low data rate users use the localized FDMA method, i.e. narrowed version of FDMA within the frequency block. Namely, the spectrum used by each of the users is arranged within the block, as described with reference to FIGS. 2A and 2B. In addition, the comb-shaped frequency spectrum used by each of the users can be distributed over the entire frequency band. Other users use a comb-like spectrum. The localized FDMA method can be mainly used in multiplexed data channels.

In addition, the same frequency band, for example, a frequency block, can be allocated to multiple users, as shown in Fig. 14. In this case, frequency multiplexing is used using a comb-like frequency spectrum. Alternatively, multiple users are multiplexed within the same frame, as described below. The information of the chips is stored in a transmission time interval (TTI) with time division into some elements. This chip information is used as an element to change the frequency used for transmission. As indicated above, a plurality of users are allocated a specific frequency band, the transmission being carried out using frequency hopping. Allocation of a certain frequency band to multiple users allows the averaging of interference from other cells (sectors). Therefore, interference fluctuations from other cells (sectors) can be reduced in comparison with a situation in which users are replaced in a certain frequency band to transmit.

The following description is based on a situation in which the coverage area of the base station 200 consists of three sectors 250 ₁ , 250 ₂ , 250 ₃ ; in sector 250 ₁ there is a mobile station A300 ₁ ; and in sector 250 ₃ there is a mobile station B300 ₂ , a mobile station C300 ₃ , a mobile station D300 ₄ and a mobile station E300 ₅ , for example, as shown in FIG.

If frequency blocks are allocated to each user, then if another mobile station exists in the neighboring sector near this mobile station, the interference power becomes higher, and if the other mobile station is at a greater distance, the interference power becomes lower.

For example, the mobile station A300 ₁ , located in sector 250 ₁ , is significantly affected by interference from the mobile station D300 ₄ , located in the neighboring sector 250 ₃ and located near the mobile station A300 ₁ , but slightly affected by interference from the mobile station E300 ₅ , located on a large distance. Therefore, the interference power varies with time, as shown in FIG. 16A.

On the other hand, when applying frequency hopping and access with frequency multiplexing using a comb-shaped frequency spectrum, the interference power is generally averaged and becomes substantially constant, as shown in FIG. 16B, which reduces the variation in interference power over time. In this case, although the transmission power for each user is lower, the communication efficiency for each user remains unchanged due to the continuous allocation of many time slices, which reduces interference fluctuations from other cells (sectors).

In addition, frequency blocks may be allocated in accordance with scheduling control information in the time domain and in the frequency domain, as shown in FIG.

In this case, the control channel, which is transmitted for measurement by the receiver 400 channel quality indicator (CQI), is transmitted in all frequency blocks, i.e. in all frequency bands of the channel.

In addition, if the graph of a user exceeds the payload size of the frequency block, one of the frequency blocks can be used exclusively by one user.

If there are many users with a low data rate, many users use the same frequency block. In this case, orthogonal frequency spectra are applied to the same frequency block, namely, a narrowed FDMA spectrum (localized FDMA method) distributed over the frequency block or a comb-like spectrum (distributed FDMA method). In particular, as described with reference to FIGS. 2A and 2B, the spectrum used by each of the users is distributed in a block within a frequency block. In addition, the spectrum used by each of the users can be distributed and placed in the frequency block in the form of a comb, which reduces mutual interference between users.

Let, for example, the optimal frequency bandwidth of the frequency block be from 0.3125 to 1.25 MHz. By narrowing the frequency band of the frequency block and planning the channel in the frequency domain, it is possible to enhance the diversity effect of multiple users.

When transmitting with a single carrier, the bandwidth allocated to each user may vary in accordance with the data rate.

Many low data rate users use the localized FDMA method, i.e. narrowed version of FDMA within the frequency block.

In addition, if scheduling is performed in the time domain and in the frequency domain, frequency blocks can be grouped, which can reduce losses in the control channel.

In addition, as shown in FIG. 18, the frequency band may vary depending on the state of the channel. For example, the frequency band allocated to the system may be divided into a plurality of frequency blocks corresponding to such allocation. In this case, when the channel is in good condition, many frequency blocks are allocated, for example, two frequency blocks (users A, B, and C), and when the channel is in worse condition, fewer frequency blocks are allocated than in the case of good channel condition (user D). Transmission with a single carrier is carried out in the thus allocated frequency band, which increases the overall efficiency of the system.

With reference to FIGS. 19A and 19B, a description will now be made of a grouping procedure for blocks.

As shown in FIG. 19A, if grouping of blocks is not performed, many low data rate users use the localized FDMA method, i.e. narrowed version of FDMA, within the frequency block or comb-like spectra.

As shown in FIG. 19B, distributed frequency grouping is used to group frequency blocks, in which discrete frequency blocks form a group, or localized grouping, in which successive frequency blocks form a group.

As indicated above, losses in the control channel used to measure the CQI can be reduced by grouping the frequency blocks in advance to plan in the frequency domain.

For example, the radio resource allocation determination unit 404 of a receiver provided in the base station 200 may determine the time and frequency allocated to a channel allocated on a competitive basis, for example, a random access channel or a backup packet channel, depending on the channel load or of another parameter and reports the corresponding allocation of resources to each mobile station in a downstream broadcast channel. For example, the radio resource allocation determination unit 404 may determine the radio resource allocation so that if the transmitted signal is a competitively allocated channel, at least a portion of the allocated frequency band is used.

In addition, the radio resource allocation determination unit 404 of the receiver provided in the base station 200 performs scheduling in accordance with the channel state and determines the time and frequency allocated to the channel allocated on a competitive basis, for example, a multiplexed data channel or the like, and reports about the appropriate allocation of resources to each mobile station in a downstream broadcast channel. Transmitted data and control messages of the third level are transmitted via a multiplexed data channel. In addition, when exchanging information over a multiplexed data channel, a Hybrid Automatic Repeat Request (H-ARQ) can be used.

In addition, the module 404 determine the allocation of radio resources of the receiving device provided in the base station 200, performs scheduling, determines the time and frequency allocated to the channel allocated on the basis of scheduling, for example, the channel through which control information is transmitted (called a multiplexed control channel), and reports the corresponding allocation of resources to each mobile station in a downlink broadcast channel.

The radio resource allocation control module 122 provides multiplexing of a channel allocated on a competitive basis and a channel allocated on a scheduling basis. For example, the radio resource allocation control module 122 may temporarily multiplex the channel allocated on a competitive basis and the channel allocated on a scheduling basis, as shown in FIG. 20A. In this case, the radio resource allocation control unit 122 can adaptively adjust the TTI parameter and set a larger TTI value, which reduces the occupancy rate of the multiplexed control channel in the total TTI duration and reduces losses in the multiplexed control channel.

In addition, the radio resource allocation control module 122 may provide frequency multiplexing of a channel allocated on a competitive basis and a channel allocated on a scheduling basis, for example, as shown in FIG. 20B.

In addition, the radio resource allocation control module 122 may provide a mixed use of time multiplexing and frequency multiplexing of a competitively allocated channel and a channel allocated based on scheduling. In this case, the radio resource allocation control module 122 can adaptively adjust the TTI parameter and set a larger TTI value, which reduces the occupancy rate of the multiplexed control channel in the total duration of the TTI interval and reduces losses in the multiplexed control channel.

The signal generation module 114 in the frequency domain shifts each of the signals from one carrier along the frequency axis so that the spectrum becomes comb-like. For example, if the process corresponding to CRF = 4 is carried out, then three zeros are inserted for each signal or sequence from one signal carrier. In addition, the module 114 generation of signals in the frequency domain allocates radio resources to each of the physical channels in accordance with the incoming information about the allocation of radio resources and depending on the specific physical channel. If a single carrier method is used in this way, the CRF value and the offset value for each signal with one carrier are changed, as well as the number of users.

A signal generation module 114 in the frequency domain distributes each of the Q parallel signal sequences, directly includes each of the signal sequences in the frequency component, and allocates radio resources to each of the distributed signals.

The inverse FFT module 116 performs fast Fourier transform of the comb-like spectrum obtained by shifting each of the signals from one carrier along the frequency axis, and thus forms a wave-like transmission spectrum for the single-carrier method.

In addition, the inverse FFT module 116 performs the inverse fast Fourier transform of the multi-carrier multi-subcarrier signal and modulates based on the OFDM method, thereby forming a wave-like transmission spectrum for the multi-carrier method.

Guard Interval Add-On Module 118 adds guard intervals to the signals to be transmitted and creates a symbol of any OFDM or multi-carrier method. Guard intervals are obtained by repeating the start or end portion of the transmitted symbol.

The filter limits the frequency band of the transmitted signal. Then produce a signal with a limited frequency band.

Next, with reference to FIG. 21, a description will be made of a receiving device 400 according to this embodiment of the invention.

A receiver 400 may be provided, for example, in a base station and transmit downlink.

The receiver 400 of this embodiment is used in the aforementioned cellular and local area communications environment.

A receiver 400 of this embodiment is intended to receive a signal transmitted using a single carrier method and a multi-carrier method. In addition, the receiving device 400 comprises a radio communication method determination module 402 and a radio resource allocation determination module 404.

The radio communication method determining module 402 determines a radio communication method authorized for use by the mobile station 300 in accordance with the environment in which the receiving device 400 is installed.

For example, in the case where the receiving device 400 is installed in a cellular environment, the radio method determination module 402 determines the application of the single-carrier method and informs the mobile station 300 about the application of the single-carrier method. If, for example, the receiving device 400 is installed in the environment of the local communication zone, the radio method determination module 402 determines the application of the multi-carrier method and informs the mobile station 300 about the application of the multi-carrier method.

For example, when installing the base station 200, the radio communication method determination module 402 determines the applicable radio communication method in accordance with the configuration of the cell, for example, the radius of the cell, the presence or absence of neighboring cells, and the like. For example, if the radius of the cell is large, determine the application of the method with a single carrier, and if the radius of the cell is small, determine the application of the method with multiple carriers. The radio communication method determination module 402 reports on the application-specific access method to the mobile stations 300 as general control information for all users.

Thus, the applicable radio communication method is determined during installation of the radio station, which simplifies configuration and management.

In addition, switching may be provided from one radio communication method to another depending on the distance between each of the users and the base station or the transmit power reserve of each of the users.

For example, if switching from one radio communication method to another is carried out depending on the distance between each of the users and the base station 200, the amount of losses in the transmission path can be used as a value corresponding to the distance between each of the users and the base station 200. In this case, the mobile station 300 measures the amount of loss in the transmission path in the downstream channel according to the receiving power of the control signal in the downstream channel and reports information on the results of measurements of losses in the transmission path of the base station 200 in the uplink.

The radio communication method determination module 402 determines that the distance between the base station 200 and the mobile station 300 is large if the obtained value of the loss in the transmission path is higher than a predetermined threshold value, determines whether a single-carrier method is used, and reports the corresponding information to the mobile stations 300.

The radio communication method determination module 402 determines that the distance between the base station 200 and the mobile station 300 is small if the obtained value of the path loss is lower than a predetermined threshold value, determines the need for a multi-carrier method, and reports the corresponding information to the mobile stations 300 as a common management information for all users.

Thus, for each mobile station, a radio communication method is set in accordance with the distance between the base station and the mobile stations.

In addition, if switching from one communication method to another is carried out in accordance with the transmit power margin of each user, then, for example, the difference between the maximum allowable transmit power and the current transmit power can be used as a value determining the transmit power margin for each user. In this case, the mobile station informs the base station of the difference between the maximum allowable transmit power and the current transmit power.

If the difference between the maximum allowable transmit power and the current transmit power is less than a predetermined threshold value, then the radio communication method determination module 402 determines that the transmit power margin is small and determines the necessity of applying a single-carrier radio communication method, which is reported to the mobile stations 300.

If, however, the difference between the maximum allowable transmit power and the current transmit power is greater than a predetermined threshold value, then the radio communication method determination module 402 determines that the transmit power margin is large and determines the necessity of applying the multi-carrier radio communication method, which is reported to the mobile stations 300 .

In accordance with the foregoing, the radio communication method is set in accordance with the performance of each of the mobile stations.

In addition, the mobile station 300 can transmit information about the maximum allowable transmit power and the current transmit power. In this case, the radio communication method determination module 402 can calculate the difference between the maximum allowable transmission power and the current transmission power and set the radio communication method in accordance with the calculated value.

A radio resource allocation determination unit 404 determines a radio resource allocation for each of the physical channels and reports corresponding information to the mobile station 300.

In addition, the radio resource allocation determination unit 404 performs scheduling for each of the users and reports the results of such scheduling to the mobile station 300.

The radio resource allocation determination unit 404 may allocate radio resources for a period based on a time scale of the Transmission Time Interval (TTI) of the frequency blocks if frequency blocks and time are allocated to each of the physical channels.

In addition, the radio resource allocation determination unit 404 schedules for the multiplexed data channel.

A radio resource allocation determination unit 404 performs frequency access multiplexing in the time domain and generates control information, as shown in FIG. 13. In this case, a plurality of frequency blocks are allocated to a user with a high data rate, which allows each user to use only pre-allocated frequency blocks. Therefore, the transmitting device 100 does not need to receive the control channel of the other transmitted frequency blocks to enable the receiving device 400 to measure the channel quality indicator (CQI).

Let, for example, the optimal frequency bandwidth of the frequency block is from 1.25 to 5 MHz. Increasing the frequency bandwidth of the frequency block allows you to enhance the effect of diversity of multiple users in the frequency block.

When transmitting with a single carrier, the bandwidth allocated to each user may vary depending on the data rate.

In addition, if the traffic volume of a user exceeds the payload size of the frequency block, one frequency block can be used exclusively by one user.

In addition, as shown in FIG. 17, the bandwidth may vary depending on the state of the channel.

Many low data rate users use the localized FDMA method, i.e. narrowed version of FDMA within the frequency block. Namely, the spectrum used by each of the users is arranged within the block, as described with reference to FIGS. 2A and 2B. In addition, the comb-shaped frequency spectrum used by each of the users can be distributed over the entire frequency band. Other users use a comb-like spectrum. The localized FDMA method can be mainly used in multiplexed transmission channels.

In addition, the radio resource allocation determination unit 404 may perform access scheduling in the time domain and in the frequency domain and generate control information.

In this case, the control channel transmitted for measuring the channel quality indicator (CQI) is transmitted in all frequency blocks, i.e. in all frequency bands of the channel.

In addition, if the traffic volume of a user exceeds the payload size of the frequency block, one frequency block can be used exclusively by one user.

If there are many users with a low data rate, many users use the same frequency block. In this case, orthogonal frequency spectra are applied to the same frequency block, namely, a narrowed FDMA spectrum (localized FDMA method) distributed over the frequency block or a comb-like spectrum (distributed FDMA method). In particular, as described with reference to FIGS. 2A and 2B, the spectrum used by each of the users is distributed in a block within a frequency block. In addition, the spectrum used by each of the users can be distributed and placed in the frequency block in the form of a comb, which reduces mutual interference between users.

Let, for example, the optimal frequency bandwidth of the frequency block be from 0.3125 to 1.25 MHz. By narrowing the frequency band of the frequency block and planning the channel in the frequency domain, it is possible to enhance the diversity effect of multiple users.

When transmitting with a single carrier, the bandwidth allocated to each user may vary depending on the data rate.

Many low data rate users use the localized FDMA method, i.e. narrowed version of FDMA within the frequency block.

In this case, the frequency blocks can be grouped, which reduces the loss in the control channel.

In addition, the same frequency band, for example, a frequency block, can be allocated to multiple users, as shown in Fig. 14. In this case, frequency multiplexing is used using a comb-like frequency spectrum. Alternatively, multiple users are multiplexed within the same frame, as described below. The information of the chips is stored in a transmission time interval (TTI) with time division into some elements. This chip information is used as an element to change the frequency used for transmission. As indicated above, a plurality of users are allocated a specific frequency band, the transmission being carried out using frequency hopping. Allocation of a certain frequency band to multiple users allows the averaging of interference from other cells (sectors). Therefore, interference fluctuations from other cells (sectors) can be reduced compared to a situation in which users are replaced in a certain frequency band to transmit.

A description of the grouping of frequency blocks is given with reference to figa and 19B.

If grouping of blocks is not performed, many users with a low data rate use a localized FDMA method, i.e. narrowed version of FDMA, within the frequency block or comb-like spectra.

To group frequency blocks, distributed grouping is used, in which discrete frequency blocks form a group, or localized grouping, in which successive frequency blocks form a group.

As indicated above, losses in the control channel used to measure the CQI can be reduced by grouping the frequency blocks in advance to plan in the frequency domain.

For example, the radio resource allocation determination module 404 may determine the time and frequency allocated for a channel allocated on a competitive basis, for example, for a random access channel or a channel of reservation packets, depending on the channel load or another parameter and reports the corresponding resource allocation for each mobile stations on the downlink broadcast channel. For example, the radio resource allocation determination unit 404 may determine the radio resource allocation so that if the transmitted signal is a competitively allocated channel, at least a portion of the allocated frequency band is used.

In addition, the radio resource allocation determination unit 404 schedules in accordance with the channel state and determines the time and frequency allocated to the channel allocated on a competitive basis, for example, a multiplexed data channel or the like, and reports the corresponding resource allocation to each mobile station in a downlink broadcast channel. Transmitted data and control messages of the third level are transmitted via a multiplexed data channel.

In addition, the module 404 determine the allocation of radio resources of the receiving device provided in the base station 200, performs scheduling, determines the time and frequency allocated to the channel allocated on the basis of scheduling, for example, the channel through which control information is transmitted (called a multiplexed control channel), and reports the corresponding allocation of resources to each mobile station in a downlink broadcast channel.

For example, the radio resource allocation determination unit 404 may group the channels according to the state of the channels, for example, the CQI measurement results, to allocate resources, thereby reducing losses in the control channel.

In addition, when exchanging information over a multiplexed data channel, a Hybrid Automatic Repeat Request (H-ARQ) can be used.

In addition, the radio resource allocation determination unit 404 schedules, determines the time and frequency allocated to the multiplexed control channel, and reports the corresponding resource allocation to each mobile station in a downlink broadcast channel.

Below, with reference to FIG. 22, a description will be made of a receiver switching frequency bands depending on the state of the channel for allocating resources.

The receiver 400 has the same configuration as the receiver described with reference to FIG.

The radio resource allocation determination module 404 of the receiver 400 comprises a reception characteristic measurement module 406, a ranking module 408 connected to a reception characteristic measurement module 406, a frequency block allocation module 410 connected to the ranking module 408, a receiving power determination module 412 connected to the allocation module 410 frequency blocks, and a modulation and coding scheme (MCS) determination module 414 connected to a receiving power determination module 412.

The reception characteristic measuring unit 406 measures any reception characteristic, for example, the reception SINR in each of the frequency blocks, for all users. All users transmit control signals in the entire frequency band. The reception characteristic measuring unit 406 determines reception conditions, for example, a reception SINR, for each of the frequency bands. In addition, if users use a portion of the frequency band of the total frequency band (system band) to transmit the control signals, the reception SINR for each resource allocation unit in the frequency band, for example, for each frequency block, as shown in FIG. 23A, is predetermined. Namely, the reception characteristic measuring unit 406 measures the reception characteristics of the transmitted control signals using a predetermined frequency band resource allocation unit as the unit of measurement.

If users use some part of the full frequency band to transmit the control signals, the reception characteristic measuring unit 406 can measure the reception conditions in such a part of the frequency band as shown in FIG. 23B. Namely, the reception characteristic measuring unit 406 measures the reception characteristics of the transmitted control signals using the required resource allocation unit, for example, the transmission frequency of the control signals, as the unit of measurement.

The ranking module 408 prioritizes according to the measured reception characteristics and prioritizes in a predetermined order, for example, so as to provide the highest possible SINR of reception, to form a ranking table. In addition, the ranking module 408 may generate a ranking table according to at least one of the following parameters: reception conditions of a pilot signal transmitted from each of the mobile stations, the reception conditions being measured at the base station (in other words, the receiving power measured by the receiving device according to the channel status measurement signal), the waiting time and type of data transmitted from each of the mobile stations, and the maximum transmit power of each of the mobile stations. As a result, for each frequency allocation unit, a mobile station is determined to which a given frequency band is allocated.

Module 410 allocation of frequency blocks allocates frequency blocks in accordance with the created ranking table. For example, the frequency block allocation module 410 pre-allocates a frequency block to a high priority user. In addition, the frequency block allocation module 410 allocates a pre-allocated frequency block and adjacent frequency blocks to the user with the highest priority. After that, the module 410 allocation of frequency blocks ranks the priorities in descending order, excluding the priorities corresponding to the user and frequency blocks for which the allocation has already been made, re-ranks the table and repeats the same procedure. Thus, continuous frequency bands are allocated to all devices in accordance with the reception characteristics of each transmitting device.

In this case, the frequency block extracting unit 410 allocates a frequency band within the transmission frequency range of the pilot signal, as shown in FIG. 24A. In this case, the frequency block allocation module 410 may allocate a frequency band according to allocation units, or, for example, as an integer number of frequency bands, as shown in FIG. 24B.

Further, if the mobile station transmits pilot signals for all frequency band allocation units using frequency hopping, the frequency block extracting unit 410 can schedule the frequency band in which the pilot signal is transmitted and allocate data channels as shown in FIG. 25A. In addition, the frequency band in which the control signal is transmitted is allocated with the possibility of changing over time. In this case, the frequency block allocation module 410 determines a data channel for each frequency band in which the pilot signal was transmitted. In this case, the duration of the planning cycle increases.

Let, for example, at time t, all mobile stations, for example, MS1, MS2, MS3 and MS4 transmit control signals in the same frequency band. Module 410 allocation of frequency blocks scheduling for mobile stations transmitting control signals in the same frequency band. In this case, scheduling is performed for the mobile stations MS1, MS2, MS3 and MS4, and a data channel is allocated to the mobile station MS3.

At the moment (t + 1), the mobile stations MS1, MS2, MS3 and MS4 transmit control signals in frequency bands different from those in which the control signal was transmitted at time t. Let, for example, the mobile stations MS1, MS2, MS3 and MS4 transmit control signals in the frequency bands adjacent to the frequency bands in which the control signal was transmitted at time t. Module 410 allocation of frequency blocks scheduling for mobile stations transmitting control signals in the same frequency band. In this case, scheduling is performed for the mobile stations MS1, MS2, MS3 and MS4, and a data channel is allocated to the mobile station MS2.

At the moment (t + 2), the mobile stations MS1, MS2, MS3 and MS4 transmit control signals in frequency bands different from those in which the control signal was transmitted at the moment (t + 1). Let, for example, mobile stations MS1, MS2, MS3 and MS4 transmit control signals in the frequency bands adjacent to the frequency bands in which the control signal was transmitted at the time (t + 1). Module 410 allocation of frequency blocks scheduling for mobile stations transmitting control signals in the same frequency band. In this case, scheduling is performed for the mobile stations MS1, MS2, MS3 and MS4, and a data channel is allocated to the mobile station MS2. After that, the data channel allocation procedure is repeated.

If each of the mobile stations independently transmits a control signal using frequency hopping, then the frequency block allocation module 410 can plan for each frequency allocation unit for mobile stations transmitting control signals in the respective frequency bands and allocate a data channel to them. For example, frequencies a adjacent to an already allocated frequency band can be allocated to some mobile station.

Let, for example, at time t, mobile stations, for example, MS3, MS4, MS5 and MS6, transmit control signals in different frequency bands: mobile station MS1 transmits a control signal in the same frequency band in which mobile stations MS3 and MS4 transmit control signals and the mobile station MS2 transmits a control signal in the same frequency band in which the mobile stations MS5 and MS6 transmit control signals.

Module 410 allocation of frequency blocks scheduling for mobile stations transmitting control signals in the respective frequency bands. The frequency block allocation module 410 schedules for each frequency band allocation unit. For example, the frequency block allocation module 410 performs scheduling for the mobile stations MS1 and MS3 and allocates a data channel to the mobile station MS1; scheduling for mobile stations MS1 and MS4 and allocates a data channel to mobile station MS4; scheduling for mobile stations MS2 and MS5 and allocates a data channel to mobile station MS5; scheduling for mobile stations MS2 and MS6 and allocates a data channel to mobile station MS2.

At the moment (t + 1), mobile stations, for example, MS3, MS4, MS5 and MS6 transmit control signals in different frequency bands. Let, for example, control signals be transmitted in frequency bands adjacent to frequency bands in which the control signal was transmitted at time t. In addition, mobile stations, for example, MS1 and MS2 transmit pilot signals in different frequency bands. Let, for example, control signals be transmitted in frequency bands adjacent to frequency bands in which the control signal was transmitted at time t.

Module 410 allocation of frequency blocks scheduling for mobile stations transmitting control signals in the respective frequency bands. The frequency block allocation module 410 schedules for each frequency band allocation unit. For example, the frequency block allocation module 410 performs scheduling for the mobile stations MS2 and MS6 and allocates a data channel to the mobile station MS2; scheduling for mobile stations MS2 and MS3 and allocates a data channel to mobile station MS2; scheduling for mobile stations MS1 and MS4 and allocates a data channel to mobile station MS4; scheduling for mobile stations MS1 and MS5 and allocates a data channel to mobile station MS5.

At the moment (t + 2), mobile stations, for example, MS3, MS4, MS5 and MS6 transmit control signals in different frequency bands. Let, for example, control signals be transmitted in frequency bands adjacent to frequency bands in which the transmission of the control signal was carried out at the time (t + 1). In addition, mobile stations, for example, MS1 and MS2 transmit pilot signals in different frequency bands. Let, for example, control signals be transmitted in frequency bands adjacent to frequency bands in which the transmission of the control signal was carried out at the time (t + 1).

Module 410 allocation of frequency blocks scheduling for mobile stations transmitting control signals in the respective frequency bands. The frequency block allocation module 410 schedules for each frequency band allocation unit. For example, the frequency block allocation module 410 performs scheduling for the mobile stations MS1 and MS5 and allocates a data channel to the mobile station MS5; scheduling for mobile stations MS1 and MS6 and allocates a data channel to mobile station MS6; scheduling for mobile stations MS2 and MS3 and allocates a data channel to mobile station MS2; scheduling for mobile stations MS2 and MS4 and allocates a data channel to mobile station MS4.

Further, if each of the mobile stations independently transmits a control signal using frequency hopping, then, as shown in FIG. 25C, the frequency block allocation module 410 can allocate a data channel in each frequency band allocation unit using, as a reception characteristic (quality indicator reception) received in the past reception quality if a frequency band is used in which control signals are not transmitted. In this case, many mobile stations can transmit control signals in the same frequency band.

Let, for example, at time t, mobile stations, for example, MS1, MS2, MS3 and MS4 transmit control signals in different frequency bands.

Module 410 allocation of frequency blocks scheduling for mobile stations transmitting control signals in the respective frequency bands. The frequency block allocation module 410 schedules for each frequency band allocation unit.

At the moment (t + 1), mobile stations, for example, MS1, MS2, MS3 and MS4 transmit control signals in different frequency bands. Let, for example, control signals be transmitted in frequency bands adjacent to frequency bands in which the control signal was transmitted at time t.

Module 410 allocation of frequency blocks scheduling for mobile stations transmitting control signals in the respective frequency bands. The frequency block allocation module 410 performs scheduling for each frequency band allocation unit using the received reception quality in the past as a reception characteristic (reception quality indicator) if a frequency band in which control signals are not transmitted is used.

At the moment (t + 2), mobile stations, for example, MS1, MS2, MS3 and MS4 transmit control signals in different frequency bands. Let, for example, control signals be transmitted in frequency bands adjacent to frequency bands in which the transmission of the control signal was carried out at the time (t + 1).

Module 410 allocation of frequency blocks scheduling for mobile stations transmitting control signals in the respective frequency bands. The frequency block allocation module 410 performs scheduling for each frequency band allocation unit using the received reception quality in the past as a reception characteristic (reception quality indicator) if a frequency band in which control signals are not transmitted is used.

If small fluctuations in the state of the channel are assumed, and the frequency band in which the control signal is transmitted does not change, then if the state of the channel in this frequency band deteriorates, the reception characteristics for the frequency band also deteriorate. Therefore, changing the transmission bandwidth of the pilot signals can improve reception characteristics.

Further, as shown in FIG. 26, if a data channel is allocated in the frequency allocation frequency band, the allocated frequency band does not change until the reception conditions vary within certain limits. Namely, after the frequency block allocation module 410 allocates a frequency band, the frequency block allocation module 410 continues to continuously allocate the same frequency band while the receiving power of the channel state measuring signal of the given frequency band in the receiving device exceeds a predetermined threshold value. For example, if the channel state in the selected frequency band changes above a predetermined threshold value, the frequency band is freed and a new allocation is made taking into account the channel status for each of the mobile stations. This allows you to reduce interference from other cells (sectors). The receiver 400 changes the modulation method used in accordance with the reception conditions before applying modulation and coding (AMC). Changes in conditions after determining the modulation method or other similar parameters degrade the reception quality. Namely, the reception conditions in the uplink are influenced by other cells (sectors), in particular other closely located users. For example, if the mobile station A300 ₁ is transmitting while the mobile station D300 ₄ located in the neighboring sector 250 ₃ of FIG. 15 is also transmitting, interference from the mobile station D300 _{4 is} affected by the mobile station A300 ₁ .

If the mobile station A300 ₁ is transmitting while the mobile station B300 ₂ located in the neighboring sector 250 ₃ is also transmitting, interference from the mobile station B300 _{2 is} affected by the mobile station A300 ₁ . Mobile station A300 ₁ determines a modulation method with respect to the ratio of the used radio waves to the interference radio waves. If the frequency band allocated to the mobile station B300 ₂ is transmitted to the mobile station C300 ₄ , the interference level increases. Although the mobile station A300 ₁ determines the modulation and coding sequence (MCS) taking into account the interfering signals from the mobile station B300 ₂ , with a sudden allocation of frequency, which leads to the transmission of the frequency band of the mobile station C300 ₄ , the interference level from neighboring sectors increases, which does not allow the receiving station to receive using a previously defined modulation method.

In order to avoid such a situation, the allocated frequency band cannot be changed until the changes in the reception conditions do not exceed a certain level. If changes in the reception conditions exceed a certain level, for example, a certain threshold value, the frequency band is freed and a new allocation is made taking into account the channel status for each of the mobile stations.

The receiving power determining unit 412 ascribes to the mobile station to which the frequency band is allocated some transmit power in the uplink. In this case, some transmit power in the uplink is attributed to the mobile station (transmitter), which is allocated a frequency band in accordance with the allocated frequency band. Let, for example, the maximum power with which a mobile station (transmitter) can transmit is known. The following describes a situation in which the transmit power in the allocated band is, for example, X, as shown in FIG. 27A. When expanding the allocated frequency band, for example, twice, the transmit power decreases by half and becomes equal to X / 2, as shown in figv. Determining the transmit power in the allocated frequency band is as follows. The receiving power determination unit 412 transmits scheduling results and transmission power information to the transmitter. This set of information is provided to the radio resource allocation control module 122.

For example, if the transmit power in a selected frequency band has a maximum value equal to X, then when the allocated frequency band is expanded, for example, by half, the maximum value of the transmission power is halved and becomes equal to X / 2.

The receiving power determination unit 412 transmits scheduling results and transmission power information to the transmitter. This set of information is provided to the radio resource allocation control module 122. As a result, the mobile station transmits on the uplink with the maximum transmit power in the allocated frequency band.

The above concentration of power in a certain frequency band allows you to increase the power of the used radio waves. In particular, if the concentration of power in a certain frequency band is carried out to enable transmission from a mobile station located at a great distance from the base station (receiving device), the base station can receive a signal of higher power, which improves the quality of reception.

The receiving power determining unit 412 can measure the interference power in the allocated frequency band and assign the transmit power taking into account the interference power so that the ratio of the power of the used radio waves to the interference power corresponds to a predetermined value.

In this case, the power that provides the required ratio of the power of the used radio waves to the interference power may be greater than or equal to the transmit power that the mobile station can provide. In this case, the transmit power that the mobile station can provide is assigned. If the power that provides the required ratio of the power of the used radio waves to the interference power is less than or equal to the transmit power that the mobile station can provide, then the power that provides the required ratio of the power of the used radio waves to the interference power is assigned.

Thus, the transmit power can be set in accordance with the reception quality at the base station.

In addition, the mobile station transmits a signal in the uplink with maximum power for the allocated frequency band. The base station can receive a higher power signal, which improves reception quality.

In addition, from the point of view of using the transmit power, the mobile station can transmit on the uplink with a constant transmit power density regardless of the width of the allocated frequency band. For example, as shown in FIGS. 28A and 28B, the radio resource allocation control unit 122 may transmit with a certain transmit power in accordance with a predetermined frequency bandwidth, even if the allocated frequency band is narrower than the predetermined frequency band. Since, as indicated above, the transmission is carried out with a constant specific transmit power per frequency band, interference with other cells (sectors) may have less impact.

The transmit power can be changed depending on the position of the mobile station. Namely, it is possible to determine whether uplink transmission is carried out with a maximum transmission power for a dedicated frequency band or with a constant transmission power density regardless of the allocated frequency band. In this case, it is possible to determine the transmit power using an appropriate determination method and report information on the used transmit power.

The base station may assign a modulation method and a degree of error correction code for transmission on the uplink of a mobile station to which a frequency band is allocated.

The modulation method and degree of the error correction code can be determined by the ratio of the power of the used radio waves to the interference power of the base station modulation and coding scheme (MCS) determination module 414. In this case, instantaneous or average values of the power of the used radio waves and the level of interference can be used. For example, if a transmitting device that is allocated a frequency band transmits a signal in accordance with the assigned transmit power and receiving power of a channel status measuring signal, a receiving device that receives a signal transmitted by the transmitting device uses an instantaneous or average value in accordance with the receiving power and power interference, and the receiving power and interference power are estimated for the selected frequency. Then, the modulation method and the degree of the error correction code are determined from the ratio of the receiving power to the interference power.

The following is an example of a description of a situation in which a mobile station transmits on an uplink with maximum transmit power for a dedicated frequency band. The interference power in the upstream channel fluctuates greatly. When the modulation method is determined by the instantaneous value of the receiving power, the interference power level changes depending on the time required to start transmission. Therefore, when carrying out such a transmission, average values of the receiving power, used radio waves and interference are used.

The following is an example of a description of a situation in which a mobile station transmits on an uplink with a constant transmit power density regardless of the width of the allocated frequency band. When making adjustments in such a situation with small fluctuations in the interference power, the instantaneous values of the receiving power, used radio waves, and interference are used.

When the MCS determination module 414 assigns the MCS during transmission of the data channel by the mobile station having the transmission permission, the MCS determination module 414 can assign the MCS according to the reception quality of the pilot signal measured for each frequency allocation unit in the allocated frequency band if the reception SINR value measured for each frequency allocation unit using the reception characteristics measuring unit 406, as shown in FIG. 29. For example, if a receive SINR value measured for each frequency allocation unit is used, the MCS is assigned in accordance with at least one of the following values: average SINR value, highest SINR value, and lowest SINR value.

In addition, the receiver, which performs the allocation for changing the frequency band depending on the state of the channel, may have the configuration shown in Fig.30.

Receiver 400 has substantially the same configuration as the receiver described with reference to FIG. 21, but differs from the receiver described with reference to FIG. 22 in that it provides a pilot assignment module 416 connected to module 406 measuring the characteristics of the reception.

The pilot signal assigning module 416 obtains information of at least one of the following types: information on the requested (maximum) bandwidth of the data channel transmitted from the mobile station, information on the amount of data transmitted, and information on the data rate. In addition, the pilot assignment module 416 obtains information about the requested (maximum) bandwidth of the transmission of the pilot from the mobile station. The pilot assignment module 416 assigns a mobile station a bandwidth for transmitting the pilot. For example, pilot assignment module 416 determines the pilot bandwidth and center frequency in accordance with information about the requested (maximum) pilot bandwidth for each mobile station and transmits information about a specific pilot bandwidth and center frequency relevant mobile stations. In addition, the pilot assignment module 416 can report information about a specific width and center frequency of the pilot signal transmission frequency bands to the respective transmitting devices by transmitting the identifiers of the frequency blocks. In this case, the pilot assignment module 416 may assign a plurality of frequency blocks.

For example, the pilot assignment module 416 assigns a frequency band whose width is less than the maximum frequency bandwidth requested by the mobile station (the requested (maximum) frequency bandwidth) if it determines that the reception quality of the control signal is not high enough even when the mobile station transmits pilot signal using the requested (maximum) bandwidth due to the large distance to the base station. For example, pilot assignment module 416 assigns a frequency bandwidth in accordance with the maximum transmit power of each of the mobile stations and the level of losses in the transmission path between the base station and each of the mobile stations.

In addition, the pilot assignment module 416 assigns the width and center frequency of the pilot transmission band for each mobile station so as to reduce or not deviate the receiving power of the pilot measured in the frequency domain when assigning the width and center frequency of the pilot transmission band signal for each mobile station, as shown in Fig. 32. For example, the pilot assignment module 416 predetermines a reference value of deviations in the receiving power of each pilot signal and determines the width and center frequency of the transmission band of the pilot signal so that the deviations do not exceed such a reference value. In this case, the pilot assignment module 416 calculates the total receiving power by the base station of the pilot signals from the mobile stations on the uplink and assigns the width and center frequency of the pilot transmission band for each of the mobile stations so as to reduce transmission bandwidth deviations in the frequency domain .

In addition, if the pilot assignment module 416 allows the mobile stations to transmit pilot signals using the IFDMA method, the pilot assignment module 416 determines the bandwidth and repetition factor for the pilot from each mobile station so that each frequency element is used without excessive or insufficient loading, as shown in figa. Namely, based on the frequency multiplexing method, the magnitude of the frequency shift is determined and transmission is performed. In this case, use a frequency shift by such a value that eliminates the multiple use of any band by the same user. For example, pilot assignment module 416 assigns a pilot bandwidth and center frequency for each of the mobile stations according to the residual value of the repetition factor. In this case, the pilot assignment module 416 assigns and reports the values of the repetition factor, the bandwidth and the center frequency of the pilot band.

In addition, the pilot assignment module 416 assigns a transmission band of a channel state measurement signal so that the number of mobile stations transmitting channel state measurement signals in each frequency band does not change. For example, a pilot assignment module 416 allocates transmission bands of a channel state measurement signal for each mobile station, starting with mobile stations having the widest transmission band. In this case, the transmission bandwidth is, for example, 2 ⁿ minimum transmission bandwidths.

The following is a description of an example of a situation where, in a system with a frequency bandwidth of 10 MHz, the number of mobile stations with a bandwidth of 5 MHz, 2.5 MHz, and 1.25 MHz is N ₅ , N _2.5, and N _1.25 . In this case, it is assumed that the minimum bandwidth, for example the width of the frequency block, is 1.25 MHz.

(1) The variables _{f 5MHz} , _{f 2.5MHz} and _{f 1.25MHz are} assigned random values. In this case, random values are integers.

(2) The frequency block ID and 4 blocks (= 5 / 1.25 blocks from ((Ф _5MHz + n ₅ ) mod (10/5) × (10/5)) allocate the n _5th mobile station with a frequency bandwidth equal to 5 MHz.

(3) Frequency ID block and 2 blocks (= 2.5 / 1.25 blocks from ((Ф _5MHz + N ₅ + n _2.5 ) mod (10/5) × (10/5) + (Ф _2.5MHz + n _2.5 ) mod (5 / 2.5) × (5 / 2.5)) allocate the nth _25th mobile station with a frequency bandwidth of 2.5 MHz.

(4) Frequency block ID and 1 block (= 1.25 / 1.25 block from ((Ф _5MHz + N ₅ + N _2.5 + n _1.25 ) mod (10/5) × (10/5) + (Ф _{2.5 MHz} + N _2.5 + n _1.25 ) mod (5 / 2.5) × (5 / 2.5) + (Ф _1.25MHz + N _2.5 + n _1.25 ) mod (2.5 / 1.25) × (2, 5 / 1.25)) allocate the n _1.25th mobile station with a bandwidth of 1.25 MHz.

For example, in the case of N ₅ = 3, N ₂₅ = 3, N _1.25 = 4, F _5MHz , F _2.5MHz and F _1.25MHz = 0, frequency bands are allocated to mobile stations in this sector one at a time, starting from mobile stations having the widest a transmission frequency band as shown in FIG. 33B.

The pilot signal assigning module 416 performs the above allocation within a predetermined cycle, because the transmission bandwidth and the number of mobile stations in the sector change due to losses in the transmission path caused by the movement of the mobile stations and / or transmission of the connection.

If the mobile station transmits a pilot using the requested (maximum) transmission bandwidth, the reception characteristic measuring unit 406 measures the reception SINR using the requested bandwidth (requested to allocate the frequency band) of the data channel as a unit of measurement, as shown in FIG. .34.

The frequency block allocation module 410 allocates the frequency bands of each of the mobile stations within the transmission band of the pilot signal in accordance with the measurement data of the reception SINR, information about the transmission band of the pilot signal and information about the requested data channel bandwidth. In this case, the frequency block extracting unit 410 may allocate using a predetermined frequency allocation unit, for example, a frequency block.

The MCS determination module 414 assigns the MCS value to the mobile station that is allowed to transmit in accordance with the reception quality of the pilot in the allocated frequency band, as shown in FIG. 35.

Below with reference to FIG. 36, a description will be made of the operation of the transmission device 100 according to the above-described embodiment of the invention.

The base station 200 identifies the radio communication method used by the mobile station 300, and reports the identification results of the method of the mobile station 300.

First, information is obtained about the radio communication method (step S1302).

Then, the switching module 106 determines whether the radio communication method information indicates a single-carrier method (step S1304).

If the information on the radio communication method indicates a single-carrier method (step S1304: “YES”), the switching module 106 switches to a single-carrier method. Namely, the switching module 106 outputs the received sequence of elementary signals to the FFT module 108.

Then, the signal generation module 114 in the frequency domain determines whether transmission data is assigned to the channel allocated on a competitive basis (step S1308).

If the transmission data is assigned to the channel allocated on a competitive basis (step S1308: “YES”), the signal generation module 114 in the frequency domain allocates radio resources for the channel allocated on a competitive basis, in accordance with the received information on the allocation of radio resources. Then carry out the transmission of data for which radio resources are allocated (step S1310).

If the transmission data is not assigned to a channel allocated on a competitive basis (step S1308: “NO”), the signal generation module 114 in the frequency domain allocates radio resources for the channel allocated on the basis of scheduling, in accordance with the received information on the allocation of radio resources. Then carry out the transmission of data for which radio resources are allocated (step S1312).

If the information on the radio communication method indicates a multi-carrier method (step S1304: “NO”), then the switching module 106 switches to a multi-carrier method. Namely, the switching module 106 outputs the incoming chip sequence to the serial-parallel conversion module 110 (step S1314).

Then, the signal generation module 114 in the frequency domain determines whether transmission data is assigned to the channel allocated on a competitive basis (step S1316).

If the transmission data is assigned to the channel allocated on a competitive basis (step S1316: “YES”), the frequency-domain signal generating section 114 allocates radio resources for the channel allocated on a competitive basis in accordance with the received information on the allocation of radio resources. Then carry out the transmission of data for which radio resources are allocated (step S1318).

If the transmission data is not assigned to the channel allocated on a competitive basis (step S1316: “NO”), the signal generation module 114 in the frequency domain allocates radio resources for the channel allocated on the basis of scheduling, in accordance with the received information on the allocation of radio resources. Then carry out the transmission of data for which radio resources are allocated (step S1320).

Below with reference to FIG. 37, a description will be made of the operation of the receiving device 400 according to the above-described embodiment of the invention.

First, the radio communication method determination module 402 determines which radio communication method the mobile station 300 uses.

The following is a description of a situation in which the radio communication method determination module 402 determines that the mobile station 300 applies the single-carrier radio communication method.

The reception characteristic measuring unit 406 measures the priority in each of the frequency blocks, for example, the reception SINR value for all users (step S2602). Priority values corresponding to the number of frequency blocks are obtained for each user.

Then, the ranking module 408 ranks the priorities of the type “(number of users) × (number of frequency blocks)” in descending order and establishes the correspondence between users and frequency blocks, forming a ranking table (step S2604).

If all users transmit control channels using the entire frequency band, the number of ranks in the ranking table is equal to the product of the number of users by the number of frequency blocks. If users transmit control channels using different frequency bands, there are no ranks corresponding to frequency blocks in which users do not transmit control channels. For example, if a user transmits a control channel using 5 frequency blocks out of 8, then the ranks of the remaining 3 frequency blocks are not included in the ranking table.

Then, the frequency block allocation module 410 pre-allocates the frequency blocks to each user in turn in accordance with the priority value (step S2606).

Frequency block allocation module 410 uses a ranking table and allocates frequency blocks corresponding to higher priority users. Suppose, for example, in accordance with the ranking table, user A has rank No. 1, and user A corresponds to frequency block 4. In this case, record “A1” is entered in frequency block 4, pointing to user A and rank No. 1. Similarly, the entry “A2”, pointing to user A and rank No. 2, is entered into frequency block 5. As a result of repeating the same procedure, a preliminary allocation is obtained.

Then, the frequency block extraction module 410 extracts a continuous sequence of frequency blocks selected from the frequency blocks previously allocated to the user with the highest priority (step S2608).

User A is allocated frequency blocks 3-5 and frequency block 8. However, in connection with the application of the single-carrier method, a frequency band containing a frequency block with the highest priority is allocated. In other words, frequency blocks 3-5 are allocated.

Then, the frequency block allocation unit 410 checks whether all frequency blocks are allocated, or whether frequency blocks are allocated to all users (step S2610).

If all frequency blocks are allocated, or frequency blocks are allocated to all users (step S2610: “YES”), then for all users to whom frequency blocks are allocated, the transmit power and the MCS value are determined (step S2614).

If not all frequency blocks are allocated, or frequency blocks are not allocated to all users (step S2610: “NO”), then the frequency block allocation module 410 ranks the priorities according to their size, excluding the priorities of users who have already allocated frequency blocks (step S2612 ), after which it returns to step S2606.

In the above example, since frequency blocks 3-5 were allocated to user A, the above procedure is repeated, excluding frequency blocks 3-5 from it.

Thus, each user is allocated frequency bands that ensure good channel condition. Not discrete, but continuous frequency blocks are allocated to each user.

Next, with reference to FIG. 38, a description is given of the operation of another receiving device 400 according to this embodiment of the invention. In particular, a description is given of the operation of the receiving device 400 described with reference to FIG. As indicated above, the receiving device 400 is provided as part of the base station, and the transmitting device 100 is provided as part of the mobile station.

First, the radio communication method determination module 402 determines which radio communication method the mobile station 300 uses.

The following is a description of a situation in which the radio communication method determination module 402 determines that the mobile station 300 applies the single-carrier radio communication method.

The control channel generation module transmits to the mobile station information of at least one of the following types: information on the requested (maximum) bandwidth of the data channel to the base station, information on the amount of data transmitted, information on the data rate. In addition, the control channel generating unit reports information on the requested maximum transmission bandwidth of the control signal (step S3802).

The pilot signal assigning unit 416 determines the width and center frequency of the pilot signal band transmitted by the mobile station in accordance with the requested maximum transmission bandwidth of the pilot signal (step S3804), and informs the mobile station about the specific width and center frequency of the pilot band signal (step S3806). In addition, the pilot assignment module 416 can report information about the determined width and center frequency of the pilot signal bandwidth to the respective transmitting devices by transmitting an identifier (ID) of the frequency block. In this case, the pilot assignment module 416 may assign a plurality of frequency blocks. For example, pilot assignment module 416 may assign a bandwidth in accordance with the maximum transmit power of each mobile station and the level of loss in the transmission path between the base station and each of the mobile stations.

The control channel generating unit transmits a control signal in accordance with the reported information about the width and center frequency of the frequency band (step S3808). In this case, the control channel generating module may transmit the control signal in a frequency hopping manner.

A reception characteristic measuring unit 406 measures a pilot signal SINR value. In addition, the frequency block allocation module 410 determines which mobile station a given frequency band is allocated from by the value of the SINR of receiving the pilot signal. In addition, the MCS determination module 414 determines the MCS value for the mobile station to which this band is allocated and which is allowed to transmit (step S3810). In this case, the transmit power determination module 412 can determine the transmit power for the mobile station to which this frequency band is allocated and which is allowed to transmit.

The radio resource allocation determination unit 404 informs the mobile station that is allowed to transmit information about the frequency band allocated to the data channel (section or frequency blocks) and the used MCS value (step S3812).

Information about the frequency band allocated for the data channel transmitted from the base station is supplied to the radio resource allocation control module 122, and information about the MCS value is supplied to the spectrum spreading and channel coding module 102.

The spreading and channel coding module 102 carries out channel coding by applying an error correction code, for example, a turbo code or a convolutional code, to the incoming binary information sequence in accordance with the received MCS value information, thereby modulating the data subjected to channel coding.

The frequency domain signal generating unit 114 determines the amount of data in accordance with the allocated frequency band. Information about the user ID (ID), the value of the MCS, the discriminator of the new / retransmission and the amount of data are multiplexed into the control channel. As a result, a transmission frame is obtained (step S3814).

Then, the mobile station transmits a data channel (step S3816).

The data channel transmitted from the mobile station is demodulated and decoded at the base station (step S3818).

The base station transmits a success / failure notification signal (ACK / NACK) in accordance with the results of demodulation and decoding.

This international application is based on Japanese patent applications No. 2005-105492, No. 2005-174394, No. 2005-241899, No. 2005-317567 and No. 2006-031749, filed, respectively, March 31, 2005, June 14, 2005, 23 August 2005 and October 31, 2005 to the Patent Office of Japan, the entire contents of which are incorporated into this application by reference.

A transmitting device, a receiving device, a mobile communication system and a method for controlling signal transmission in accordance with embodiments of the present invention can be used in mobile communication systems performing packet data exchange.

Claims (9)

1. A mobile station containing a transmitting device configured to generate orthogonal comb-shaped spectra of control signals distributed in a block within the frequency block of the system’s frequency band, and also with the possibility of transmitting control signals, and the transmitting device determines the frequency band of the frequency block in accordance with the bandwidth and frequency set by the base station, so that the control signals transmitted by the respective mobile station mi are orthogonal in frequency. 2. The mobile station according to claim 1, characterized in that the transmitting device transmits a control signal using the frequency hopping method. 3. The mobile station according to claim 1, characterized in that the transmitting device controls the transmit power in relation to the control signal. 4. The mobile station according to claim 1, characterized in that the transmitting device controls the transmit power in accordance with the frequency band of the control signal. 5. A method for transmitting a signal, comprising the following steps:
form orthogonal comb-like spectra of control signals distributed in a block within the frequency block of the system bandwidth; and
transmit control signals
wherein the determination of the frequency bandwidth of the frequency block occurs in accordance with the frequency bandwidth and frequency specified by the base station, so that the control signals transmitted by the respective mobile stations are orthogonal in frequency. 6. The method according to claim 5, characterized in that the control signal is transmitted using the frequency hopping method. 7. The method according to claim 5, characterized in that when transmitting the control signal, the transmit power is adjusted with respect to the control signal. 8. The method according to claim 5, characterized in that when transmitting the control signal, the transmit power is adjusted in accordance with the frequency band of the control signal. 9. A mobile communication system including a mobile station comprising a transmitting device configured to generate orthogonal comb-like spectra of control signals distributed in a block within the frequency block of a system bandwidth, and also with the possibility of transmitting a control signal; and a base station configured to receive a pilot signal from the mobile station, wherein the mobile station determines the frequency bandwidth of the frequency block in accordance with the frequency bandwidth and frequency set by the base station, so that the control signals transmitted by the respective mobile stations are orthogonal frequency.

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