User device, system, and method in mobile communication system

(54) Title: USER APPLIANCE, (57) APPLIANCE Summary: BASE STATION, AND METHOD IN MOBILE COMMUNICATION SYSTEM (30) Unionist Priority: 3/20/2007 jp 2007-073724 (73) Holder (s): nu Docomo, inc.

(72) Inventor (s): Kenichi Higuchi, Mamoru Sawahashi, Nobuhiko Mlki (74) Attorney (s): Dannemann, Siemsen, Bigler & Ipanema Moreira (86) International application: pct JP2008054642 of 13/03/2008 (87) Publication International: wo 2oos / i266i7de 23/10/2008

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Invention Patent Descriptive Report for USER APPLIANCE, BASE STATION APPLIANCE, AND MOBILE COMMUNICATION SYSTEM METHOD.

TECHNICAL FIELD

The present invention relates to the next generation mobile communication scheme. More specifically, the present invention relates to a user device, a base station device and a method in the mobile communication system of the next generation mobile communication scheme.

BACKGROUND OF THE TECHNIQUE

In this type of technical field, research and development on the next generation communication system is progressing rapidly. In the communication system considered as now from the point of view of expanding coverage while reducing PAPR (Peak-to-average power ratio), it is proposed to use a single carrier scheme for uplink. In addition, in this communication system, both for uplink and downlink, radio resources are appropriately allocated, as a form of a shared channel which is shared by a plurality of users, according to the communication states of each user and the like. More specifically, a user's data signal on the uplink is transmitted over a shared physical uplink channel (PUSCH). The terms channel and signal can be used synonymously as there is no fear of confusion. A user data signal on the downlink is transmitted over a physical downlink shared channel (PDSCH).

The processing for determining the assignment is called scheduling. In order to properly execute uplink programming, each user device transmits a reference signal (also called a pilot channel) to a base station, and the base station evaluates the uplink channel status based on reception quality. In addition, in order to execute programming on the downlink, the base station transmits a reference signal to the user's device, and the user's device reports the channel status information to the base station (CQI: Channel Quality Indicator) based on the reception quality of the reference signal. Based on the reported CQI of each user's device, the base station evaluates the downlink channel status to perform downlink programming. The programming content is transmitted to each user's device by a downlink control signal. This control signal is called a downlink L1 / L2 control channel or a downlink L1 / L2 control signal.

As uplink control signals, there are control information (called first control information, for the sake of convenience) that must be transmitted following an uplink data signal, and control information (called first control information , for the sake of convenience) that are transmitted regardless of the presence or absence of the uplink data signal. The first control information includes the information necessary for demodulation of a data signal, such as a modulation scheme, a channel coding rate and the like, of the data signal. Second control information includes downlink channel CQI information, downlink data signal confirmation (ACK / NACK) information, and resource assignment request information, and the like. Therefore, there is a possibility that the user's device transmits only the first control information, only the second control information, or both the first and the second control information using the uplink control signal.

When a resource block (radio resources) is assigned to transmit an uplink data channel, the first control information (and the second control information as needed) is transmitted by the resource block. On the other hand, when the uplink data signal is not transmitted, it is considered to transmit the second control signal using dedicated resources (dedicated band). In the following, an outline of an example is described in which a band is used in this way.

Figure 1 shows an example of using an uplink band. Figure 1 shows the resources (a plurality of resource blocks) for transmitting the physical uplink shared channel (PUSCH) than the uplink data signal, and shows the resources (which correspond to the dedicated band) for a user for which PUSCH resources are not allocated to transmit the uplink control signal. The latter is called a physical uplink control channel (PUCCH). In the example shown in the figure, one or more of four resource blocks are assigned to users, and a first hop control signal and a second hop control signal are prepared over a transmission time interval (TTI), and a a third hop control signal and a fourth hop control signal are prepared in the next TTI. Each hop control signal corresponds to the PUCCH. Performing a jump in time and frequency in TTIs or subframes, a diversity effect can be obtained. Each of the first to the fourth hop control signals can be occupied by one user or multiplexed by a plurality of users. This type of transmission scheme for uplink control signals is described in non-patent document 1.

[Non-patent document 1] 3GPP, R1-071245 DESCRIPTION OF THE INVENTION

PROBLEM TO BE SOLVED BY THE INVENTION

In the aforementioned proposed methods, it is necessary to report, to the user's device, which resource should be used for the uplink control signal using the L1 / L2 downlink control signal. As for the uplink control signal for a user to whom the resources are not allocated for the transmission of the uplink data signal, it is necessary to report, for each device of the user, which opening in the dedicated resources should be used for the transmission of the uplink control signal. The uplink control signal can only include confirmation information (ACK / NACK), for example. Essentially, only one bit is required for confirmation information. But, confirmation information plays a central role in relay control, and true or false confirmation information greatly affects data transmission throughput. However, in the conventional method, to transmit the confirmation information, which is merely a bit, using the uplink, it is necessary to report, to the user's device, which resource should be used for the transmission of confirmation information using the signal L1 / L2 downlink control each time. Thus, there is a problem that such processing is inefficient. In addition, there is a problem with the fact that it is difficult to improve the quality of the confirmation information since it is difficult to obtain an encoding gain for the confirmation information that is merely one bit.

An object of the present invention is to efficiently report, to the user's device, which resource should be used to transmit, on the uplink, control information that has a small number of bits, but that requires high quality.

MEANS TO SOLVE THE PROBLEM

In the present invention, a user apparatus which transmits an uplink control signal to a base station apparatus using a single carrier scheme is used. The user's device includes: a unit configured to receive a downlink control signal and a downlink data signal; a unit configured to prepare acknowledgment information indicating a positive or negative acknowledgment for the downlink data signal; a unit configured to prepare the uplink control signal that includes the confirmation information; a unit configured to transmit the uplink control signal using different resources which are different from the resources that can be used for an uplink data signal; and a storage unit configured to store a predetermined match ratio which exclusively associates the downlink control signal or downlink data signal resources with the resources used for the uplink control signal.

EFFECTS OF THE PRESENT INVENTION

According to the present invention, it becomes possible to efficiently report, to the user's device, the information that indicates which resource should be used in uplink to transmit the control information that has a small number of bits, but that requires high quality.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a diagram showing an example of using the band used in a mobile communication system;

Figure 2 shows a block diagram of a user's apparatus according to a first embodiment of the present invention;

Figure 3 is a diagram showing examples of TTI, subframe and block;

Figure 4 is a diagram to explain the properties of the code

CAZAC;

Figure 5 is a diagram showing a situation in which each long LB block is multiplied by a factor (modulation data);

Figure 6 is a diagram showing a situation in which each long LB block is multiplied by factors (modulation data and block dispersion code);

Figure 7 shows a block diagram of a base station apparatus according to a first embodiment of the present invention;

Figure 8 is a flow chart showing an example of operation of the present invention;

Figure 9 is a flow chart for specifying the information code for broadcast information and assigned number;

Figure 10 is a diagram showing examples of adjusting CAZAC codes, amounts of cyclic displacement and bands performed by executing the flow shown in Figure 9;

Figure 11 is a diagram showing an example of a correspondence relationship between the downlink control signal resources addressed to the user's device and the uplink control signal resources;

Figure 12 is a diagram showing a situation in which specific resources are reserved for a user who performs persistent programming;

Figure 13 shows a block diagram of the user's apparatus according to a second embodiment of the present invention;

Figure 14 shows a block diagram of the base station apparatus according to a second embodiment of the present invention; and

Figure 15 is a diagram showing an example of a correspondence relationship between the resource blocks addressed to the user's device and the resources of the uplink control signal. DESCRIPTION OF REFERENCE SYMBOLS

304 ACK / NACK determination unit

306 block-by-block modulation pattern generation

308 block-by-block modulation unit

310 discrete Fourier transform unit (DFT)

312 subcarrier mapping

314 fast inverse Fourier transform unit

316 cyclic prefix addition unit (CP)

318 multiplexing unit

320 RF transmission circuit

322 power amplifier

324 duplexer

331 CAZAC sequence number adjustment unit

332 CAZAC code generation unit

333 cyclic displacement number adjustment unit

334 cyclic displacement unit

335 block dispersion code adjustment unit

336 block dispersion unit

337 frequency adjustment unit

338 reference signal generation unit

340, 340 'unit of determination

342, 342 'code information and resource information unit

702 duplexer

704 RF receiving circuit

706 reception time estimate unit

708 Fast Fourier Transform Unit (FFT)

710 channel estimate unit

712 subcarrier demapping unit

714 frequency domain equalization unit

716 inverse discrete Fourier transform unit (IDFT)

718 demodulation unit 722 programmer

742, 742 'code information and resource information unit PREFERRED EMBODIMENTS TO CARRY OUT THE INVENTION

For the sake of convenience of explanation, although the present invention is described as being classified in some modalities, the classification of each modality is not essential in the present invention, and equal to or more than two modalities can be used as needed. Although specific numerical values ​​are in the explanation, such numerical values ​​are merely examples, so that any appropriate value can be used unless otherwise specified.

[Mode 1]

Figure 2 shows a block diagram of a user's device according to an embodiment of the present invention. Figure 2 shows an ACK / NACK 304 determination unit, a block-by-block modulation pattern generation unit 306, a block-by-block modulation unit 308, a discrete Fourier transform (DFT) unit 310, a subcarrier mapping unit 312, a fast reverse Fourier transform (IFFT) unit 314, a cyclic prefix addition unit (CP) 316, a multiplexing unit 318, an RF transmission circuit 320, a power amplifier 322, a duplexer 324, a CAZAC 331 sequence number adjustment unit, a CAZAC code generation unit 332, a cyclic shift number adjustment unit 333, a cyclic shift unit 334, a unit block scatter code adjustment 335, block dispersion unit 336, frequency adjustment unit 337, reference signal generation unit 338, a determination unit 340 for the number of L1 / L2 control information and the number of retransmission times, and a code information and resource information 342 unit.

The ACK / NACK 304 determination unit determines whether there is an error in each of the packets that form the received downlink data signal, and outputs a determination result as confirmation information. Confirmation information can be represented as a positive acknowledgment (ACK) that indicates that there is no error or a negative acknowledgment (NACK) that indicates that there is an error. As it is only necessary that the confirmation information can represent the presence or absence of an error in the received packet, the confirmation information can be represented essentially by a bit. But, the confirmation information can be represented by a larger number of bits.

The block-by-block modulation pattern generation unit 306 models each of the channel status information (CQI) and acknowledgment information (ACK / NACK) in a block-by-block modulation pattern. A predetermined number of blocks is included in a subframe, and the subframe forms a transmission time interval (TTI) which is a unit of resource allocation.

Figure 3 shows examples of the subframe and TTI. In the examples shown in the figure, a 1.0 ms TTI includes two subframes each being 0.5 ms, and each subframe includes six long blocks (LB) and two short blocks (SB). The long block is 66.7 feet, for example. The short block is 33.3 feet, for example. The numerical values ​​are merely examples, and can be changed as needed. Generally, the long block is used to transmit the data (control signal, data signal and the like) which are unknown to the receiving side, and the short block is used to transmit the data (pilot channel and the like) which are known for the receiving side. In the example shown in the figure, a TTI includes 12 long blocks (LB1-LB12) and 4 short blocks (SB1-SB4).

The block-by-block modulation pattern generation unit 306 shown in Figure 2 determines the correspondence relationship between one or more of the 12 blocks (LB1-LB12) and the bits representing the channel status information (CQI), and determines the correspondence relationship between one or more of the 12 blocks (LB1-LB12) and the bits that represent the confirmation information (ACK / NACK). The user's device transmits only the channel status information, transmits only the confirmation information, or transmits both of these, using an uplink control signal. Therefore, (A) all 12 blocks can be associated with the channel status information, (B) all 12 blocks can be associated with the confirmation information, or (C) a portion of the 12 blocks can be associated with the information channel status and the remainder may be associated with confirmation information. In any case, based on the correspondence ratio, one factor is prepared for each of the 12 blocks, so that 12 factors (first factor - twelfth factor) are prepared in total by a TTI.

The block-by-block modulation unit 308 forms a first long block by multiplying, by the first factor, all the chips of a CAZAC code sequence (the length of the sequence can be associated with a long block) assigned to the user's device, and forms a second long block multiplying all the chips in the same CAZAC code sequence by the second factor, and after that, similarly, the block-by-block modulation unit 308 forms a twelfth long block by multiplying all the chips of the same CAZAC code sequence by the twelfth factor, so that the block-by-block modulation unit 308 derives a sequence of information to be transmitted in a TTI. The CAZAC code sequence commonly used for all blocks is an orthogonal code sequence assigned in the resident cell to identify the user's device. The properties of the CAZAC code sequence will be described later.

The discrete Fourier transform (DFT) unit 310 performs a discrete Fourier transform to transform the time series information into frequency domain information.

Subcarrier mapping unit 312 performs mapping in the frequency domain. Especially when the frequency division multiple access scheme (FDM) is used to multiplex a plurality of user devices, the subcarrier mapping unit 312 performs signal mapping based on bands set in the frequency adjustment unit 337. There are two types of FDM schemes which are a localized FDM scheme and a distributed FDM scheme. In the localized FDM scheme, a continuous band is assigned to each individual user on the geometric frequency axis. In the distributed FDM scheme, a downlink signal is generated so that the signal includes the discrete frequency components over a wide band (over the entire specific band F_RB2 for the uplink control signal).

The fast inverse Fourier transform (IFFT) unit 314 restores the frequency domain signal to a time domain signal by performing an inverse Fourier transform. The cyclic prefix addition unit (CP) 316 adds a cyclic prefix to the information to be transmitted. The cyclic prefix (CP) acts as a guard interval to absorb the delay of propagation of multiple paths and to absorb the differences in reception time between a plurality of users at the base station.

The multiplexing unit 318 multiplexes the reference signal into information to be transmitted in order to generate a transmission symbol. The reference signal is transmitted by the short block (SB1, SB2) shown in the frame configuration of Figure 3. The reference signal is a signal that includes a pattern which is known from the transmitting and receiving sides, and can also be referred to as a pilot signal, a pilot channel, a training signal, and the like.

The RF transmission circuit 320 performs processing such as digital-to-analog conversion, frequency conversion, band limitation and the like to transmit the transmission symbol over a radio frequency.

The power amplifier 322 adjusts the transmit power.

Duplexer 324 appropriately separates a transmit signal and a received signal so that simultaneous communication is carried out.

The CAZAC 331 sequence number adjustment unit sets a CAZAC code sequence sequence number used by the user's device. The CAZAC code will be described later with reference to Figure 4.

The CAZAC 332 code generation unit generates the CAZAC code sequence for the adjusted sequence number.

The cyclic offset number adjustment unit 333 sets an amount of cyclic offset of the CAZAC code sequence to be used by the user's device according to the code information.

Cyclic displacement unit 334 derives another code by cyclically rearranging the CAZAC code sequence according to the adjusted cyclic displacement amount.

In the following, an outline of the CAZAC code will be described.

As shown in Figure 4, it is assumed that a code length of a CAZAC A code is L. For the sake of convenience of explanation, although it is assumed that the code length corresponds to a time duration of L samples or L chips , such an assumption is not essential to the present invention. Another B code is generated by moving a series of Δ samples (the shaded area in the Figure) that includes the last sample (L^esímo sample) from the CAZAC A code to the top of the CAZAC A code as shown at the bottom of Figure 4. In this case, the CAZAC A and B codes are orthogonal to each other with respect to Δ = 0 ~ (L-1). That is, a CAZAC code is orthogonal to a code obtained by cyclically displacing the CAZAC code. Therefore, when a sequence of a CAZAC code of the L code length is prepared, L codes which are orthogonal to each other can be theoretically prepared. A CAZAC A code is not orthogonal to another CAZAC C code that cannot be obtained by cyclically shifting the CAZAC A code. However, a cross correlation value between the CAZAC A code and a random code which is not a CAZAC code is notably greater than a cross correlation value between the CAZAC A code and the CAZAC C code. Thus, the CAZAC code is also preferably from the point of view of reducing the amount of cross-correlation (amount of interference) between the non-orthogonal codes.

In the present mode, each user device uses a CAZAC code selected from a group of CAZAC codes that have such properties (a group of code sequences derived by cyclically displacing a CAZAC code). In the present modality, between L codes that are orthogonal to each other, L / L_THE codes obtained by cyclically displacing a basic CAZAC code by Δ = ηχΙ__Δ are actually used as reference signals by mobile stations (n ​​= 0, 1, ..., (L-1) / Ι__Δ). L_THE it is a quantity determined based on a delayed propagation quantity of multiple paths. In doing so, an orthogonal relationship can be maintained on uplink control signals transmitted from individual user devices under a multi-path propagation environment. The details of the CAZAC code are described in DC Chu, Polyphase codes with good periodic correlation properties, IEEE

Trans. Inform. Theory, vol. IT-18, pp. 531-532, July 1972; 3GPP, R1050822, Texas Instruments, On allocation of uplink subchannels in EUTRA SC-FDMA, for example.

The block dispersion unit 336 shown in Figure 3 prepares a set of a predetermined number of factors (block dispersion codes) and multiplies each of the long blocks (LB) by each factor. The block scatter code is an orthogonal code sequence, and which orthogonal code sequence is specified by the information from a code information specification unit 330.

Figure 5 shows the subframes of a first user device UE1 and a second user device UE2 in which multiplication by the block scatter code is not performed. Both the user's first and second devices use a CAZAC code sequence (CAZAC1). But, the user's second device uses a cyclic displacement amount Δ which is different from that used by the user's first device. Therefore, two subframes transmitted by the user's devices are orthogonal to each other. Mod.a indicates the data for modulating a first long block for the first user device UE1, ie Mod.a indicates a factor used for multiplication. Mod.a Mod.f corresponds to the first factor up to the sixth factor (or seventh to eighth factors) for the user's first device UE1. Mod.u - Mod.z corresponds to the first factor up to the sixth factor (or seventh to eighth factors) for the second user device UE2. Each factor (modulation data) can include any information.

Figure 6 shows a situation in which the long blocks of each of the first and second user devices UE1 and UE2 are multiplied by block dispersion codes. In the example shown in the Figure, a factor (separately from the modulation data) is prepared every two long blocks. This factor forms a block dispersion code (BLSC). As shown in the dashed line table, an orthogonal code (1, 1) is prepared for the first user device UE1, and an orthogonal code (1, -1) is prepared for the second user device UE2. As described in the first modality, as long as one or more resource blocks are multiplied by the same factor (value), the orthogonality of the CAZAC code that forms the long block is not lost.

Therefore, as shown in the figure, when a set of factors by which the blocks are multiplied are codes that are orthogonal between users, users can be made orthogonal to each other using the codes while maintaining the CAZAC code orthogonality. However, blocks which are multiplied by an orthogonal code must have the same content. In the example shown in the figure, for the first user UE1, each of the first factor and the second factor is Mod.a, each of the third factor and the fourth factor is Mod.b, and each of the fifth factor and the sixth factor is Mod.c. Similarly, for the second user UE2, each of the first factor and the second factor is Mod.x, each of the third factor and the fourth factor is Mod.y, and each of the fifth factor and the sixth factor is Mod.z . Thus, the content of information carried by the first to the twelfth factors is limited to a certain degree. But, the limitation is not critical since the number of bits needed to represent ACK / NACK, etc. it is relatively small.

As the first and second user devices UE1 and UE2 can be identified by the block dispersion codes (1, 1) and (1, -1), the amount of CAZAC code offset used for the first and second devices of the user can be the same (it is not essential to use different amounts of cyclic displacement Δ). For the sake of convenience of explanation, although factors by which long blocks are multiplied are described, short SB blocks can be multiplied by factors.

In the case when the frequency division multiplexing (FDM) scheme is applied to an uplink control signal from a plurality of user devices, the frequency adjustment unit 337 shown in Figure 2 specifies which frequency should be used by each user device.

The reference signal generation unit 338 prepares a reference signal to be included in the uplink control signal. As mentioned above, the reference signal is transmitted using the short block (SB1, SB2) in the frame configuration shown in Figure 3. The reference signal is also formed by a CAZAC code assigned to each user's device. The CAZAC code for the reference signal can also be specified by a sequence number and a cyclic shift amount.

Generally, the long block (LB) and the short block (SB) are different in length, in time duration, or in number of chips, a CAZAC C code_L included in the long block (LB) and a CAZAC code Cs included in the short block (SB) can be prepared separately. However, as both of these are used for the same user device, there may be a relationship between CAZAC C codes_L and Cs (for example, a part of C_L can form Cs).

Unit 340 to determine the number of L1 / L2 control information and determine a number of retransmission times demodulates and decodes the downlink L1 / L2 control signal to specify where the control information addressed to the user's device is mapped. In other words, the determination unit 340 specifies a position number to which the control information addressed to the user's device is mapped among multiple portions of control information from one or more users multiplexed in the L1 / L2 control information of downlink. For the sake of convenience of explanation, it is assumed that N user control information is multiplexed into the downlink L1 / L2 control signal, and that control information for the specific user's device is mapped to an X- position. The unit of determination 340 specifies the information that indicates X. In addition, when the signal received by the user's device is a retransmission packet, the determination unit 340 also specifies how many times the retransmission has been performed.

The code information and resource information unit

342 specifies the code information which includes the information of a CAZAC code sequence (sequence number), a quantity of cyclic displacement of the CAZAC code sequence, a transmission band and the like, used by the user's device. The code information can be derived based on broadcast information from the broadcast channel, or can be reported from the base station individually. The individual report can be run using an upper layer signal such as an L3 control signal. The code information further specifies an orthogonal code sequence represented by a set of factors (block dispersion code sequence) by which each set of a plurality of blocks is multiplied.

The code information and resource information unit 342 refers to a list indicating a matching relationship between X which is the number of downlink L1 / L2 control information (the number of retransmission times as needed) and the uplink control signal resources to specify the resources by which the uplink control signal including acknowledgment information is to be transmitted.

Figure 7 shows a base station apparatus according to an embodiment of the present invention. Figure 7 shows a duplexer 702, an RF receiving circuit 704, a reception time estimation unit 706, a Fast Fourier Transform (FFT) unit 708, a channel estimation unit 710, a demapping unit subcarrier 712, a frequency domain equalization unit 714, an inverse discrete Fourier transform (IDFT) unit 716, a demodulation unit 718, a 722 programmer and a 742 code information and resource information unit.

Duplexer 702 appropriately separates between a transmit signal and a received signal so that simultaneous communication is carried out.

The RF receiving circuit 704 performs processing such as an analog digital conversion, frequency conversion, band limitation and the like to process the received symbol in the baseband.

The reception time estimation unit 706 specifies the reception time based on a synchronization channel or a reference signal on a received signal.

The Fast Fourier Transform (FFT) unit 708 performs a Fourier transform to convert the time series information to information in the frequency domain.

The channel estimation unit 710 estimates a uplink channel state based on the uplink reference signal reception state, and outputs the information to perform channel compensation.

Subcarrier demapping unit 712 performs demapping in the frequency domain. This processing is performed in response to the frequency domain mapping performed on the individual user's devices.

The frequency domain equalization unit 714 performs an equalization of the received signal based on the channel estimate value.

The inverse discrete Fourier transform (IDFT) unit 716 restores a frequency domain signal to a time domain signal by performing an inverse discrete Fourier transform.

Demodulation unit 718 demodulates the received signal. As for the present invention, an uplink control signal is demodulated, so that demodulation unit 718 outputs the downlink channel channel status information (CQI) and / or confirmation information (ACK / NACK) for the downlink data signal.

Programmer 722 determines the downlink assignment based on the quality of the downlink channel channel status information (CQI) and other criteria. In addition, programmer 722 determines the allocation of uplink resources based on the result of receiving the reference signal transmitted from each user's device and other criteria. The determined information is output as programming information. The programming information specifies the frequency, time, transmission format (data modulation scheme and channel coding rate) and the like used to transmit the signals.

In addition, programmer 722 reports, to the code information and resource information unit 742, information indicating where the control information for each user device is mapped to the downlink L1 / L2 control signal. The information indicates a position number to which the control information for each user is mapped among multiple portions of control information of one or more users multiplexed in the downlink L1 / L2 control signal. In the above-mentioned example, the control information addressed to a user's device is mapped to an X^The position, and the X information is reported to the code information and resource information unit 742 for the user's device.

Based on the result of assignment by the programmer, the code information and resource information unit 742 specifies the code information which includes a sequence number that indicates a CAZAC code used by a user device on the uplink, the amount of cyclic shift, the usable frequency band, the block dispersion code and the like. Code information can be commonly reported for each user using the broadcast channel or can be reported individually for individual users. In the first case, it is necessary that each user's device derives only the code information specific to the user's device from broadcast information.

Like the code information and resource information unit 342 (Figure 2), the code information and resource information unit 742 refers to a list that indicates a correspondence relationship between X which is a number of information downlink L1 / L2 control (number of retransmission times as needed) and uplink control signal capabilities, and specifies the resources to be used to transmit the uplink control signal that includes confirmation information in the future.

Figure 8 shows an operating procedure according to an embodiment of the present invention. In this operating example, general code information for all user devices is transmitted via the broadcast channel (BCH). Each user device derives only code information specific to the device itself from the broadcast information. General code information may include information indicating that there are N CAZAC code strings (C # 1, C # 2, ..., C # N) used within the cell, there are M cyclic shift amounts (0, 1__Δ, ..., (M-1) χ Ι__Δ) for each sequence, and which frequency division multiplexing (FDM) scheme is used and there are F bandwidths available (Bw1, Bw2, ..., BwF), and the like. As needed, the code information can include information about the block scatter code.

In step B1, the base station device performs downlink programming, and the base station device sends a downlink control signal (L1 / L2 control signal), a downlink data signal and a reference signal for the user's device.

In step M1, the user's device specifies information (code information for the user's device) related to the code used for an uplink control signal based on information included in the downlink control signal.

Figure 9 shows an example of a method for specifying the code information that can be used in step M1. For the sake of simplicity, it is assumed that two CAZAC code strings (C # 1, C # 2) are prepared, three cyclic displacement amounts (0, Ι__Δ, 2Ι__Δ) are prepared for each sequence, and that two available bands (Bw1, Bw2) are prepared. Therefore, 2x3x2 = 12 user devices can be identified. The numbers are merely examples, and other appropriate numbers can be used.

In step S1, the user's device recognizes an assigned number P (= 1, 2 ..... 12) of the user's device specified in the downlink L1 / L2 control signal.

In step S2, the user's device determines whether the assigned number p is greater than 3 or not. When the determination result is No (when p = 1,2 or 3), the sequence number is specified as C # 1, the amount of displacement is specified as (P-1) x L_THE, and the band is specified as Bw1. When the assigned number is greater than 3, the process flow goes to step S3.

In step S3, the user's device determines whether the assigned number p is greater than 6 or not. When the determination result is No (when p = 4, 5 or 6), the sequence number is specified as C # 1, the amount of displacement is specified as (P-1) x Ι__Δ, and the band is specified as Bw2. When the assigned number is greater than 6, the process flow goes to step S4.

In step S4, the user's device determines whether the assigned number p is greater than 9 or not. When the determination result is No (when p = 7, 8 or 9), the sequence number is specified as C # 2, the amount of displacement is specified as (P-7) x Ι__Δ, and the band is specified as Bw1. When the assigned number is greater than 9 (when p = 10, 11 or 12), the sequence number is specified as C # 2, the amount of offset is specified as (P-10) x Ι__Δ, and the band is specified as Bw2.

Figure 10 shows examples of CAZAC codes, cyclic shift amounts and bands performed by executing the flow shown in Figure 9. As shown in the Figure, users are multiplexed using a code division multiplexing (CDM) scheme using a CAZAC code of the same frequency, first. As the number of users increases, users are multiplexed in code using the same CAZAC code sequence in another band. After that, CDM is performed on each available band. In other words, although a CDM and an FDM are executed, preference is given to the CDM. In the case when multiplexing users, the number of which is greater than the number of users that can be identified by code division multiplexing using a CAZAC code sequence and using frequency division multiplexing, another CAZAC code sequence is prepared, and users are multiplexed by CDM, and CDM and FDM.

Assuming that N CAZAC code strings (C # 1, C # 2, ..., C # N) are prepared, M cyclic displacement quantities (0, Ι__Δ, ..., (M1) x L_The) are prepared, a frequency division multiplexing (FDM) scheme is used, and that F available bands (Bw1, Bw2, ..., BwF) are prepared, the CAZAC code sequence number is represented as a value of (P / (MxF) in which a fractional portion is rounded, one ((P- (n-1) x (MxF)) / M)^The band is used, and the amount of cyclic displacement is represented as (P- ((n-1) x (MxF)) - (f-1) x M = Pmod M) times L_THE.

In the example described with reference to Figures 9 and 10, the user's device starts using another Bw2 band in time when the assigned number or the number of multiplexed users exceeds three. However, even when the number of multiplexed users is greater than 3 and equal to or less than 6, it can be considered to use the same band Bw1, and instead to use another CAZAC C # 2 code sequence. The CAZAC codes C # 1 and C # 2 are not orthogonal to each other where one cannot be derived from the other by shifting cyclically. However, the reason for using C # 1 and C # 2 is that the cross-correlation value is relatively small.

As mentioned above, the code information for each user's device can be specified from the broadcast information and the assignment information p. The specified code information is provided for the CAZAC 331 sequence number adjustment unit, the cyclic offset number adjustment unit 333, the block dispersion code adjustment unit 335, the frequency adjustment unit 337 and the reference signal adjustment unit 338 shown in Figure 2, so that various parameters are adjusted.

In step M2 in Figure 8, the user's device determines the presence or absence of an error for each packet of the downlink data signal. For example, error detection can be performed using the cyclic redundancy check (CRC) method, or any other appropriate error detection method known in this technical field can be used. The user's device determines a positive ACK confirmation which indicates that there is no error (or within a permissible range even if there is an error) or a negative NACK confirmation which indicates that there is an error, for each package. ACK and NACK form the confirmation information.

In step M3, the user's device measures the reception quality of the downlink reference signal and converts the measurement value to a numeric value within a range to derive the channel status information (CQI). For example, in the case when the reception quality (SIR and similar) is represented as 32 levels, the user's device converts the measurement result to a numerical value that indicates which level the current reception quality is at, so that the CQI that can be represented by 5 bits is derived.

It is not essential that steps M2 and M3 are performed in this order. The determination of confirmation information and the measurement of channel status information can be performed at any appropriate time.

In step M4, the user's device generates an uplink control signal to report, to the base station, either one of the confirmation information (ACK / NACK) or the channel status information (CQI). As mentioned above, the block-by-block modulation pattern generation unit shown in Figure 2 prepares one factor for each of 12 blocks, so that 12 factors (first factor - twelfth factor) are prepared for a TTI. One or more of the 12 factors can represent confirmation information, channel status information or other information. The uplink control signal has a frame structure shown in Figures 3 and 6.

For example, the first long block (LB1) is generated by multiplying the entire CAZAC code sequence (cyclically displaced) by the first factor. The second long block (LB2) is generated by multiplying the same CAZAC code sequence by the second factor. After that, in the same way, a K^esimo long block (LBK) is generated by multiplying the same CAZAC code by K^esimo factor. Consequently, a frame for the uplink control signal that includes 12 long blocks is generated. More appropriately, the frame includes a reference signal formed by a CAZAC code.

The uplink control signal generated in this way is transmitted from the user's device to the base station using a dedicated band. The user's device can only determine which part of the dedicated band is used based on resource information. The resource information indicates a predetermined correspondence relationship between a mapping position on the downlink L1 / L2 control signal and the resources of the uplink control signal, and are specified by the code information and resource information units. 342 and 742 shown in Figures 2 and 7.

For example, assuming that control information for a user's device is mapped to an x^esimo position in the downlink link L1 / L2 control signal which includes the information of N users, the corresponding relation associates only X with an opening (Figure 1), a CAZAC code (sequence number, amount of cyclic displacement), code block dispersion, frequency band and the like used for the uplink control signal. This correspondence relationship is known to the user's handset and the base station handset. Consequently, the resources to be used for the uplink control signal and includes confirmation information are solely derived based on information that indicates that the control information (control information accompanying the downlink data signal) is addressed. to the user's device they are mapped to the X-position, and the uplink control signal is transmitted using the resources.

Figure 11 schematically shows such a predetermined correspondence relationship. In the example shown in the figure, when the control information that accompanies the downlink data signal addressed to a user device (that is, the control information that includes the programming information) is mapped to an X^Theposition, an ACK / NACK is transmitted by the first hop control signal (Figure 1). The downlink data signal can be a retransmission packet instead of a new packet. In the case when a block of resources used for the retransmission package is specifically determined, the correspondence ratio is determined considering such information.

Figure 12 shows a situation in which the resources for the uplink control signal are reserved for a user who performs persistent programming. When a downlink communication based on persistent programming is performed, the downlink L1 / L2 control signal is not transmitted. In this case, an uplink control signal that includes ACK / NACK is transmitted by specially prepared resources as shown in Figure 12.

In step B2 in Figure 8, the base station device receives uplink control signals from a plurality of user devices, and demodulates the signals. Each user device transmits a similar uplink control signal. But, the uplink control signals use the same CAZAC code sequence that has different amounts of cyclic displacement, different bands, a CAZAC code of different sequences and / or different block dispersion codes. These are specified by the code information and resource information unit 742.

As mentioned above, since the entire CAZAC code is merely multiplied by a factor in each long block, the base station device can add the uplink control signals received from each user's device in phase. Therefore, when the block dispersion code is used, the orthogonality of the code is exercised. In addition, the orthogonality between CAZAC codes of the same sequence that have different amounts of cyclic displacement is not collapsed. Thus, the base station device can orthogonally separate the signals sent from each user device. Even when a non-orthogonal CAZAC code is used, the user's device can be identified with less interference compared to the case in which a random sequence is used. Also, by determining the content of the first to the twelfth factors used for the uplink control signal for each user device, the content of confirmation information and / or channel status information can be identified.

In step B3, the base station handset performs processing such as retransmission control and resource allocation based on the acknowledgment information (ACK / NACK) and / or channel status information (CQI) reported from the handset. user by the uplink control signal.

According to the present modality, the position of mapping the information addressed to the user's device on the downlink L1 / L2 control signal and the resources for the uplink control signal including the ACK / NACK are only determined using the predetermined match ratio. Thus, it is unnecessary to report the resources to be used for the uplink control signal one by one. As it is only necessary to prepare the resources (for the number of multiplexed users and the number of retransmission times) at the most, the resources can be saved compared to the second modality mentioned above.

[Mode 2]

Figure 13 shows a block diagram of the user's device according to a second embodiment of the present invention. In general, the user's device is similar to that described with reference to Figure

2. But, the user device shown in Figure 13 is different from the one shown in Figure 2 in processing unit 340 'to determine the number of resource blocks of the downlink data signal, and in the code information and resource information unit 342 '.

Unit 340 'for determining the number of downlink data signal resource blocks extracts the control information addressed to the user device from the downlink L1 / L2 control signal, and determines a resource block for the which downlink data signal addressed to the user's device is mapped. For the sake of explanation, it is assumed that the downlink data signal is transmitted to the user's device using a Y^{is very} resource block (RB-Y).

In addition to specifying the code information as the 342 unit shown in Figure 2, the code information and resource information unit 342 'refers to a list indicating a matching relationship between the location (RB-Y) of the resource block used for the downlink data signal and the resources of the control signal uplink control and specifies which resource to use to transmit the uplink control signal including conformation information. The code and resource information specified are reported for each component as the case of the first modality.

Figure 14 shows a block diagram of the base station apparatus according to the second embodiment of the present invention. In general, the base station apparatus shown in Figure 14 is similar to that shown in Figure 7. But, the base station apparatus shown in Figure 14 is different from that shown in Figure 7 in processing over the code information unit and resource information 742 '. First, programmer 722 reports information indicating a resource block to which the downlink data signal addressed to each user's device is mapped, to the code information and resource information unit 742 '. Assuming that a data signal addressed to a user's device is mapped to a Y^and resource block (RB-Y), information indicating that the resource block is RB-Y is reported to the code information and resource information unit 742 'as to the user's device.

In addition to specifying the code information as 742 shown in Figure 7, the code information and resource information unit 742 'refers to the predetermined matching relationship between the resource block number (RB-Y) and the signal signal resources. uplink control that includes ACK / NACK for the data signal transmitted using the resource block, so that the code information and resource information unit 742 'specifies which resource should be used to transmit the uplink control signal in the future.

Figure 15 shows an example of the matching relationship. In the example shown in the figure, for 16 resource block numbers, ACK / NACK for the first to eighth resource blocks is transmitted by the first hop control signal (Figure 1), and ACK / NACK for the ninth up to the sixteenth resource block is transmitted by the second hop control signal (Figure 1).

In the present mode, as the number of resource blocks used for the user's device and the resources for the uplink control signal that includes the ACK / NACK are solely determined by the predetermined correspondence ratio, it is not necessary to report to user's device, information indicating which feature should be used for the uplink control signal one by one. As the resources for the uplink control signal are solely derived from the resource block number used for the user's device, it is not necessary to identify whether the data signal transmitted by the resource block is based on persistent programming or not. In addition, since the resource block number is used as a basis, instead of using the control signal mapping position as the first modality, the resources for the uplink control signal can be easily specified.

As described above, although the present invention is described with reference to specific modalities, the respective modalities are merely exemplary, so that a person skilled in the art will understand the variations, modifications, alternatives, and substitutions. Although examples of specific numerical values ​​are used to facilitate the understanding of the present invention, such numerical values ​​are merely examples, so that any appropriate value can be used unless otherwise specified. The classification in each modality is not essential in the present invention, and equal to or more than two modalities can be used as needed. For convenience of explanation, although the apparatus according to the modalities of the present invention is explained using function block diagrams, such apparatus as described above can be implemented in hardware, software, or a combination thereof. The present invention is not limited to the above embodiments, so that variations, modifications, alternatives, and substitutions are included in the present invention without departing from the spirit of the present invention.

This international application claims priority based on Japanese patent application number 2007-073724, filed with JPO on March 20, 2007 and the entire contents of Japanese patent application number 2007-073724 is hereby incorporated by reference.