CN101627560B - Method and apparatus for transmitting and receiving control information to randomize inter-cell interference in a mobile communication system - Google Patents

Abstract

A method and apparatus for transmitting and receiving control information in the SC-FDMA system. Sub-frame each comprise a plurality of different time slots of SC-FDMA symbols to generate different orthogonal codes. By carrying control information symbol and a sequence allocated for CDM of the control information is generated by multiplying the control channel signal. The control channel signal to SC-FDMA symbols is multiplied by a multiplication of the orthogonal codes based chip, and transmits the SC-FDMA symbol.

Description

A method and apparatus for transmitting and receiving control information to randomize inter-cell interference in a mobile communication system

FIELD

[0001] The present invention relates generally to control a mobile communication system, and more particularly relates to inter-cell interference randomization for transmitting and receiving in the next generation multi-cell mobile communication system the uplink (UpLink, UL) transmission caused method and device information.

Background technique

[0002] In the technical field of mobile communication, recently an orthogonal frequency division multiple access (Orthogonal FrequencyDivisionMultiple Access, 0FDMA) or single-carrier frequency division multiple access (SingleCarrier-Frequency DivisionMultiple Access, SC-FDMA) has been investigated for a radio channel high-speed transmission. Asynchronous cellular mobile communication standardization organization, Third Generation Partnership Project (3rdGeneration Partnership Project, 3GPP) Long Term Evolution is working on next generation mobile communication system with multiple access scheme relating to (Long Term Evolution, LTE).

[0003] The data transmission or non-transmission of data, LTE UL control systems for different information using transport format (Transport Format, TP). When data is transmitted simultaneously on the UL control information and data and control information are multiplexed by time division multiplexing (time Division Multiplexing, TDM). If only the transmission control information, the control information allocated to a specific frequency band.

FIG transport mechanism is shown when the transmission only when the control information on UL [0004] FIG 1 in the conventional LTE system. The horizontal axis represents time and the vertical axis represents frequency. In time defines a subframe 102, and defines a transmission (TX) 120 in the frequency bandwidth.

[0005] Referring to FIG 1, a basic UL time transmission unit, that is the subframe length I 102 ms, and includes two slots 104 and 106, each of length 0.5 msec. Each slot 104 or 106 includes a plurality of long blocks (Long Block, LB) 108 (or long SC-FDMA symbols) and a short block (Short Blocks, SB) 110 (or short SC-FDMA symbols). In the case shown in FIG 1, one slot is configured to have two six LB 108 and SB 110.

[0006] The minimum frequency transmission unit is LB pilot tone (frequency tone), and a basic resource allocation unit is a Resource Unit (Resource Unit, RU). RU 112 and RU 114 has a plurality of tones, where, for example, 12 frequency tones form one RU. By using scattered pilot tones are formed rather than a continuous pilot tone RU, can achieve frequency diversity (frequency diversity).

[0007] Since the LB 108 and SB 110 has the same sampling rate (sampling rate), so that SB 110 having a pilot tone frequency tone size is twice the size of the LB 108. RU assigned to a number of tones in SB 110 is assigned to a half of the number of tones in RU LB108. In the case shown in FIG. 1, LB 108 carry control information, and the SB 108 carries a pilot signal (or reference signal (Reference Signal, RS)). Sequence of pilot signals are determined in advance, the receiver utilizes channel estimation sequence execution, to perform coherent demodulation.

[0008] If only control information is transmitted on the UL, the LTE system in the control information transmitted in a predetermined frequency band. In Figure 1, the bandwidth of the frequency band is located on both sides of the TX 120 RU 112 and an RU 114 at least.

[0009] In general, the band carrying control information is defined in units of RU. When asked plurality RU, RU to meet using a continuous single carrier property. In order to increase frequency diversity for one subframe, there may be slot-based frequency hopping occurs.

[0010], the first control information (Control # 1) in FIG. 1 transmission in the first slot 104 in the RU 112, and 106 transmitted in RU 114 in second slot by frequency hopping. Meanwhile, the second control information (Control # 2) 114 is transmitted in the first slot 104 in the RU, and 106 transmitted in RU 112 in second slot by frequency hopping.

[0011] the control information is information indicating success or failure, for example, downlink (DownLink, DL) data received feedback information, i.e., an acknowledgment / negative acknowledgment (ACKnowledgment / NagativeACKnowledgment, ACK / NACK), it is generally I bits. Repeated in a plurality of LB in order to increase reception performance and expand cell coverage. When the I-bit control information is transmitted from different users, consider the code division multiplexing (Code Division Multiplexing, CDM) for multiplexing the I-bit control information. And frequency division multiplexing (Frequency Division Multiplexing, FDM) with t dagger, the CDM characteristics of interference robustness.

[0012] As the code sequence for CDM multiplexing control information to discuss Zadoff-ChU (ZC) sequence. ZC sequence in the time and frequency of its constant envelope but provides good PAPR (Peak-to-Average PowerRatio, PAPR) characteristics and excellent channel estimation in frequency performance. For UL transmission, PAPR is the most important consideration. Higher PAPR leads to a smaller cell coverage, thereby increasing a signal power requirement for a user equipment (User Equipment, UE) of. So, first of all should aim to reduce PAPR in UL transmission.

[0013] with good PAPR characteristics of the ZC sequence has zero circular autocorrelation for a non-zero shift values ​​(non-zero shift). The following equation (I) described in the ZC sequence mathematically.

[0014]

[0015] where, N represents the ZC sequence length, P denotes the index of the ZC sequence, and [eta] represents a sampling ZC sequence index (η = 0, ..., Ν-1). Because P and N should be relatively prime, the number of sequence indices as the sequence length N P changes. Thus, for N = 6, P = 1,5, two ZC sequences generated. If N is a prime number, N-1 is generated sequences.

[0016] two ZC sequences having different P values ​​generated by Equation ⑴ having a plurality of cross-correlation, which is an absolute value of I / 7 ^, with the phase P changes.

[0017] The ZC sequence by the control information from a user and control information to distinguish from other users, which will be described in more detail by way of example.

[0018] in the same cell, I bits from different UE's control information field by a ZC sequence cyclic shift values ​​(cyclic shift value) identifier. Cyclic shift values ​​are UE-specific to satisfy the condition that is greater than the maximum transmission delay of the radio transmission path, thus ensuring mutual orthogonality among the UE. Thus, for multiple access UE can be accommodated depends on the length and the number of cyclic shift value of a ZC sequence. For example, if the ZC sequence length of 12 samples, and to ensure orthogonality between the minimum cyclic shift value of a ZC sequence is 2 samples, six of the UE (= 12/2) obtained multiple access.

[0019] FIG. 2 shows a transmission mechanism for control information from the UE are CDM-multiplexed.

[0020] Referring to FIG 2, in cell 202 (cell A), the first and second UE 204 and 206 (UE # 1 and UE # 2) use the same ZC sequence in LB, i.e. ZC # 1, and for user identification, respectively a cyclic shift ZC # 1 0208 and Λ 210. In the case shown in FIG. 2, to expand cell coverage, UE # 1 and UE # 2 are contemplated by the modulation code (Intended) I-bit UL control information six membered repeated, i.e., repeated in six LB the modulation symbols, and in each LB, and the repetition symbols, cyclic shifted ZC sequence is multiplied i.e. ZC # 1 generates a control channel signal. Since the ZC sequence cyclic autocorrelation characteristics, these control channels to maintain orthogonality between the signals and the UE # 2 UEtn without interference. Λ 210 is set to be larger than the maximum transmission delay of the radio transmission path. Each slot carries SB for controlling the two coherent demodulation of the pilot information. For purposes of illustration, FIG. 2 shows only one slot control information.

[0021] In the cell 220 (cell B), the third and fourth UE 222 and 224 (UE # 3 and UE # 4) use the same ZC sequence in LB i.e. ZC # 2, respectively, and to identify the user ZC 0226 # 2 cyclic shift and Λ 228. Since the cyclic autocorrelation characteristic of the ZC sequence, control channel signals from UE # 3 and UE #. 4 is kept orthogonal without interference between them.

[0022] However, when the control channel signals using different ZC sequences of different cells from the UE, the information transmission control program causing interference between these cells. In Figure 2, cell A UE # 1 UE # 2 and UE # ZC sequence differs from the use of B cells in the 3 and UE # 4. Cross-correlation characteristic of ZC sequences cause interference proportional to the cross-correlation between the ZC sequences between the UE. Therefore, a method of inter-cell caused by control information transmission as described above for reducing interference.

SUMMARY

[0023] The advantages of the present invention has been made to solve the problems and / or disadvantages above at least, and to provide at least the advantages described below. Accordingly, one aspect of the present invention provides a method and apparatus for reducing inter-cell interference when a multi-cell environment multiplex control information from different users.

[0024] Another aspect of the present invention provides a method and apparatus for further randomizing inter-cell interference control information is applied to the specific subframe in a cell-specific or random sequence used for the UE.

A further aspect of the [0025] present invention provides a method and apparatus for controlling the random sequence information of the first layer / second layer (L1 / L2) signaling is applied to the UE in subframe notified by.

[0026] A further aspect of the present invention provides a method and apparatus for controlling inter-subframe to effectively receive information without cell interference.

[0027] In accordance with one aspect of the invention, there is provided a method for transmitting control information in a SC-FDMA system. Sub-frame each comprise a plurality of different time slots of SC-FDMA symbols to generate different orthogonal codes. Generating a control channel signal by the symbol carrying control information and a sequence allocated for CDM of the control information is multiplied. The control channel signal to SC-FDMA symbol basis and the multiplied as the orthogonal code chip, and transmits the SC-FDMA symbol.

[0028] According to another aspect of the present invention, there is provided a method for receiving control information in a SC-FDMA system. Sub-frame each comprise a plurality of different time slots of SC-FDMA symbols to generate different orthogonal codes. Conjugated sequence multiplied by the received signal and a control channel allocated for CDM of the control information sequence. The control channel signal and multiplying the orthogonal code by multiplying the chips in SC-FDMA symbol basis, to acquire the control information.

[0029] According to another aspect of the present invention, there is provided an apparatus for transmitting control information in a SC-FDMA system. Generating a control channel signal via the control symbols including control information and a sequence allocated for CDM of the control information is generated by multiplying the control channel signal. The transmitter is a subframe comprising a plurality of different time slots of each SC-FDMA symbol generated different orthogonal codes to SC-FDMA symbols based on the control channel signal and the orthogonal code chip phase multiplication, and transmits the control channel signal multiplied in the SC-FDMA symbols.

[0030] According to a further aspect of the invention, there is provided an apparatus for receiving control information in a SC-FDMA system. It includes a control channel receiver receives the signal control information. The control channel signal receiver and the conjugate of the control channel signal sequence allocated for CDM of the control information sequence is multiplied by and SC-FDMA symbols based on the control channel signal and the multiplied chips for different time slots comprises a plurality of subframes each SC-FDMA symbols of different orthogonal codes multiplied to obtain the control information.

BRIEF DESCRIPTION

The above and other aspects, features and advantages will become more apparent [0031] THE DRAWINGS The following detailed description, certain exemplary embodiments of the present invention, wherein:

[0032] FIG. 1 is a diagram showing a conventional LTE system transport mechanism for control information;

[0033] FIG. 2 shows a transmission mechanism for control information from the UE are CDM-multiplexed;

[0034] FIG. 3 is a flowchart showing a control operation in a UE transmits information according to an embodiment of the present invention;

[0035] FIG. 4 is a diagram showing an embodiment of the present invention, a flow chart of operation of the information received in the Node B control;

[0036] FIG. 5 is a diagram showing the transmission mechanism in accordance with the control information of the present embodiment of the invention;

[0037] FIGS. 6A and 6B are block diagrams illustrating an embodiment of the present invention, UE in the transmitter according to;

[0038] FIGS. 7A and 7B are a block diagram illustrating a receiver in the node B of the embodiment according to the present invention;

[0039] FIG. 8 is a diagram showing a transmission mechanism according to an embodiment of the present invention, the control information;

[0040] FIG. 9 is a diagram showing another transmission mechanism for control information according to an embodiment of the present invention;

[0041] FIGS. 1OA and FIG 1OB is a block diagram illustrating a transmitter of an embodiment of the MS in accordance with the present invention;

[0042] FIGS. 1lA and 1lB is a block diagram illustrating a receiver in the node B of the embodiment according to the present invention;

[0043] FIGS. 12A and 12B are diagrams illustrating a control information transmission scheme according to an embodiment of the present invention; and

[0044] FIG. 13 is a diagram showing another transmission mechanism for control information according to an embodiment of the present invention.

Detailed ways

Preferably the present invention will be described [0045] in detail with reference to the accompanying examples. It should be noted that although similar components are shown in different drawings, but they are indicated by like reference numerals. It may be omitted in the detailed description of the structures or processes known in the art to avoid making the present invention is not clear.

Example [0046] The present invention provides a UL control information from a plurality of UE is the frequency range (frequency area) determined in advance in the case where the system band on the multiplexed transmission and reception operation of a Node B and UE.

[0047] Embodiments of the invention will be described for the case where a plurality of control information from the UE for transmission in a CDM SC-FDMA cellular communication system. Embodiments of the present invention is also applicable to a particular time does not share - multiplexing frequency resources, for example FDM or TDM transmission of the control information. CDM may be a one time-domain CDMA and frequency-domain CDM wherein various CDMA scheme.

[0048] For the CDM, a ZC sequence is used, although any other code sequence with similar characteristics are also available. I bits of the control information is control information, for example where ACK / NACK. However, inter-cell interference reduction method of the present invention is also applicable to the control information having a plurality of bits, such as channel quality indicator (Channel Quality Indicator, CQI). In this case, each bit of control information being sent in one SC-FDMA symbol. The inter-cell interference reduction method is also applicable to different types of CDM transmission of control information, different types of control information such as the I-bit control information and control information having a plurality of bits.

[0049] When the UE in neighboring cells transmit their control information using the length of the M SC-FDMA symbols M of LB as UL time transmission units for different ZC sequences of N, inter-cell interference. [0050] If the relative phase between the UE LB in sequence from the adjacent cell is randomized, while maintaining a ZC sequence cyclic autocorrelation and cross-correlation properties, the interference between neighboring cells at the receiver LB are bridged during the phase accumulation LB carry control information subframe randomized, thus reducing the average interference power.

[0051] According to an embodiment of the present invention, each UE in a subframe basis LB generates its ZC sequence, and the random sequence having a random phase or a random cyclic shift values ​​applied to the ZC sequence in each LB, thereby randomizing the ZC sequence. Then, UE using the randomized ZC sequence to transmit control information. Random sequence is cell-specific. Different random sequence for each UE using the phase values ​​or cyclic shift values ​​of interference randomization is further increased.

Example [0052] The present invention proposes three ways. In the following description, a ZC sequence of length N is represented by gp (η). ZC sequence gp (η) is randomized over M an LB, and the control information, and randomized (randomized) ZC sequence g / p, ffl, k (n) is multiplied by, where, k represents a channel carrying control information index .

[0053] The method described in Equation I ⑵ randomized ZC sequence.

[0054] g 'p, m, k (n) = gp ((n + dk) mod N) .SMjI11,

[0055] (m = I, 2, .., Μ, η = O, I, 2 .., Ν_1) ..... (2)

[0056] wherein, dk denotes a cyclic shift value of the same ZC sequence, channel k carrying the control information through a dk identification. Cyclic shift value is preferably a time domain cyclic shift value, although it may be frequency domain cyclic shift value. In Equation (2), mod representative of a modulo operation. For example, A mod B represents A divided by B's.

[0057] SM, m represents the orthogonal code of length M, is + Is or -1s. The orthogonal codes can be Walsh codes. m represents an LB index information is mapped to control. If the control information is repeated four times in the slot of the subframe, then the length of a Walsh chip sequence is multiplied by one of 4, and LB for each time slot, and the sub-frame two slots fertile combination of Walsh sequences for each cell are different, and therefore the inter-cell interference randomization. For additional randomization, a different combination of Walsh sequences can be used for each UE.

[0058] Equation (3) describes the randomized ZC sequence according to Method 2.

[_] SP, m, k W = Sp (O + dk) mod N) .ej <L,

[0060] (m = I, 2, ..., Μ, η = 0,1, 2 ..., Ν_1) ..... (3)

[0061] wherein, Φπ random phase value of the phase change represents the ZC sequence gp (n) in each of the LB. By using different sets of random phase values ​​to adjacent cells in LB subframe, i.e. different random phase sequences {Φπ}, the inter-cell interference is randomized.

[0062] Equation (4) describes the randomized ZC sequence according to Method 3.

[0063] g 'p, m, k (n) = gp ((n + dk + Am) mod N),

[0064] (m = I, 2, .., Μ, η = O, I, 2 .., Ν_1) ..... (4)

[0065] wherein, Λ m represents randomly changing the cyclic shift value of the ZC sequence gp (η) domain cyclic shift value dk of each of LB. By using different sets of time domain cyclic shift values ​​to adjacent cells in LB random sub-frame, i.e. different random time-domain cyclic shift sequences {Λπ}, the inter-cell interference is randomized. Although the random cyclic shift values ​​are used in the field, they may be adapted to be used in the frequency domain.

[0066] FIG. 3 is a flowchart illustrating operation of transmitting control information according to an embodiment of the present invention using the randomized ZC sequence.

[0067] Referring to FIG 3, UE receives sequence information and random sequence information from a Node B by signaling in step 302. Sequence information is about a ZC sequence for use in transmitting control information, including the index and the cyclic shift values ​​of ZC sequence. Random sequence information is used for randomizing the ZC sequence, including a random phase sequence as a set of random phase values ​​or a random time-domain cyclic shift as a sequence of random domain cyclic shift value is set to supply a subframe for LB . The signaling is upper-layer (e.g. L2) signaling or physical layer (LI) signaling. To randomize inter-cell interference, the random phase sequence or the random time-domain cyclic shift sequence is different for each of the cells. For further interference randomization, the random phase sequence or the random time-domain cyclic shift sequence can also be set for each UE is different.

[0068] In step 304, UE generates the control information, and using the control information generating complex-valued modulation symbols (hereinafter referred to as control symbols). The number of control symbols is allocated equal number of LB for transmission of control information. For example, if the control information is an I-bit, generated by repeating the UE and number of assigned LB as many control symbols.

[0069] In step 306, UE using the sequence information included in the index and to generate a ZC sequence cyclic shift value. Then, in step 308, UE random phase sequence according to the information included in a random sequence or a random time-domain cyclic shift sequence generated random values. Random values ​​are a Walsh sequence, random phase values, or random time-domain cyclic shift values. These random values ​​for each cell and / or each UE is different. In step 310, UE LB by applying random values ​​based on the randomized ZC sequence to generate a ZC sequence. In step 312, UE randomized ZC sequence and the control symbols are multiplied, the product is mapped to an LB, and transmits the mapped LB.

[0070] FIG. 4 is a diagram showing an embodiment of the present invention, a flow chart of operation of the information received in the Node B control.

[0071] Referring to FIG 4, in step 402, the Node B by the UE in the plurality LB from the expected received signal with the signal applied to the ZC sequence acquired correlation signal correlation. In step 404, the Node B leads to a pilot signal received from the UE performs channel estimation, and channel estimation performs channel compensation for the correlation signal. In step 406, the Node B by LB corresponding to the UE based on the random value applied to the correlation signal after channel compensation, thereby removing random values ​​from the channel-compensated correlation signal to obtain control information. Random values ​​corresponding to the UE is transmitted from node B to random sequence information that the UE.

[0072] In the transmitting and receiving control information in the above, an LB (i.e. SC-FDMA symbol) is a basic unit, control information is mapped to the basic unit for transmission. LB repeat units in the ZC sequence, and the random phase sequence or the random time-domain element of a cyclic shift sequence change LB by.

[0073] In the case where a plurality of cells exist under the same Node B, a UE in each cell using the same ZC sequence and different time domain cyclic shift value of a control channel multiplexed thereof. If the node B cells to LB basis using a different random phase sequences or random time-domain cyclic shift sequence is between the UE may lose orthogonality. Accordingly, in this environment, the random phase sequence or the random time-domain cyclic shift sequence is specific to the Node B, the Node B and the cell using the same random sequence.

[0074] The first embodiment of the present invention a method of equation (2) described in I.

[0075] FIG. 5 shows a transmission mechanism for control information according to the first embodiment of the present invention.

[0076] Referring to Figure 5, in one subframe, the same I-bit control information occurs 8 times, and subjected to slot-based frequency hopping, in order to achieve frequency diversity. If each slot, and the first two and last SB LB carries a pilot channel estimation, the time slot may be remaining LB for transmitting control information. Although one RU is used for transmitting control information, a plurality of RU may be used to support multiple users.

[0077] in the first slot, carrying the I-bit control information modulation symbol occurs four times, for transmission in four LB, LB-based and are multiplied by orthogonal codes of length 4 in S1502 (= Sl4aSl4j2Sl4j3Sl4j4 ). Sl4, x orthogonal code representatives SI chip X. The pilot sequence is also based in LB or SB times the length of an orthogonal code SI 4 of '504 (= S1' 4, iSl '4,2S1' 4,3S1 '4,4). Using orthogonal codes can increase the number of multiple-access (multiple-access) users. For example, for length 4, four orthogonal codes are available. Four orthogonal codes using the number of users can be accommodated in the same frequency resource is not used when the orthogonal codes four times.

[0078] in the second slot, the I-bit control information occur four times, and at times the length LB based orthogonal codes 4 S2 506 (= S24j1S24j2S24j3S24j4). Pilot sequence also LB or SB basis multiplied by an orthogonal code of length 4 S2 '508 (= S2' 4j1S2 / 4j2S2 / 4j3S2 / 4,4).

[0079] Node B notifies orthogonal code S1502, S1 '504, S2506, and S2' 508 to the UE signals. Due to the nature of orthogonal codes due to its length should be a multiple of four. In FIG. 5, orthogonal codes of length 4 are applied to each slot. If the transport mechanism of FIG. 5, the slot-based frequency hopping is not to occur, it may be considered control information during one sub-frame transmission has undergone channel variation across frequency negligibly small. Therefore, even if the length of the orthogonal codes is extended to one subframe, and still maintain orthogonality. In this case, orthogonal codes of length 8 can be used to transmit control information in one subframe.

[0080] The different combinations for each cell arranged to be applied to the slots of one subframe orthogonal code, in order to randomize inter-cell interference. For example, in order to transmit control information in a slot, the cell A uses orthogonal code sequence {SI, S2}, and B cells sequentially using orthogonal codes {S3, S4}. Orthogonal code combination {S3, S4} includes at least one is different from the orthogonal code combination {SI, S2} orthogonal codes.

[0081] FIGS. 6A and FIG. 6B is a block diagram illustrating an example of the UE transmitter according to an exemplary embodiment of the present invention.

[0082] 6A, the transmitter includes a controller 610, a pilot generator 612, control channel signal generator 614, data generator 616, a multiplexer (Multiplexer, MUX) 617, serial - (Serial-to- Parallel, S / P) converter 618, a fast Fourier transform (FFT) processor 619, a mapper 620, an inverse fast Fourier transformer (IFFT) 622, and - a string (Parallel-to-Serial, P / S) converter 624, orthogonal code generator 626, a multiplier 628, a cyclic prefix (cyclic prefix, CP) adder (adder) 630 and an antenna 632. And will not be described herein UL data transmission related parts and operation.

[0083] The controller 610 provides overall control operation of the transmitter, and generates MUX 617, FFT processor 619, mapper 620, pilot generator 612, control channel signal generator 614, data generator 616 and orthogonal code a control signal generator 626 required. Is supplied to pilot generator 612 indicates a control signal to be used for time-domain sequence index and the cyclic shift values ​​generated pilot sequences. With UL control information and data transfer control signals are provided to the associated control channel signal generator 614 and data generator 616.

[0084] MUX 617 multiplexes the guide 612, the data generator 616 and control channel signal generator 614 receives pilot generator to the pilot signal, in accordance with the timing information from the data signal received from the controller 610 to the control signal indicated and control channel signals, for transmission in an LB or an SB. Mapper 620 receives allocation information from the controller 610 according to LB / SB timing information and frequency mapping the multiplexed signal to frequency resources.

[0085] When only control information is transmitted without data, orthogonal code generator 626 generates orthogonal codes with the information received from the controller 610 to be used on a particular time slot in a cell-specific or UE- orthogonal code to LB / SB, and based on information received from the timing controller 610 to the orthogonal code chip is applied to the symbols mapped to the control channel of signal LB. Orthogonal code information is provided to controller 610 by Node B signaling.

[0086] S / P converter 618 converts the multiplexed signal from MUX 617 to parallel signals and provides them to FFT processor 619. FFT processor 619 input / output size according to a control signal received from the controller 610 to change the. FFT signal mapper 620 maps from the FFT processor 619 to frequency resources. IFFT processor 622 converts the mapped frequency signals to time signals and P / S converter 624 serial signal of the time. The multiplier 628 serial time signal by the orthogonal codes generated from the orthogonal code generator 626. That is, orthogonal code generator 626 generates the timing according to the information received from the controller 610 to be applied to the control slot of the subframe carrying the information of the orthogonal codes.

[0087] CP adder 630 to the signal received from the CP 628 to the multiplier, in order to avoid inter-symbol interference, and the transmission antenna 632 through transmit signal CP is added.

[0088] FIG 6B is a detailed block diagram illustrating the control channel signal generator 614 according to an embodiment of the present invention.

[0089] Referring to Figure 6B, a control channel signal generator 614 generates a sequence of 642 LB code sequence is generated based, for example, a ZC sequence. To do so, sequence generator 642 receives sequence information from the controller 610, such as a sequence length and a sequence index. Node B and the UE are known sequence information.

[0090] The control information generator 640 generates modulation symbols having I-bit control information, and the repeater 643 repeats the control symbol to produce and control the number of allocated information LB as many control symbols. LB multiplier 646 by the control symbols based on a ZC sequence is multiplied by the CDM carried out on the control symbols, thereby generating a control channel signal.

[0091] Function of the multiplier 646 to generate a control channel signal is multiplexed by the user symbol is multiplied by the ZC sequence output from the repeater 643. By replacing the multiplier 646 with an equivalent device, it is contemplated that the modified embodiment of the present invention.

[0092] FIGS. 7A and 7B are a block diagram illustrating a receiver in the node B of the embodiment according to the present invention.

[0093] Referring to Figure 7A, the receiver includes an antenna 710, CP remover 712, S / P converter 714, FFT processor 716, a demapper 718, IFFT processor 720, P / S converter 722, demultiplexing device (DEMUX) 724, a controller 726, a control channel signal receiver 728, channel estimator 730 and data demodulator and decoder 732. And will not be described herein UL data and receiving operation of the associated member.

[0094] The controller operation receiver 726 pairs provide overall control and generates DEMUX 724, IFFT processor 720, demapper 718, control channel signal receiver 728, channel estimator 730 and data demodulator and decoder 732 required control signals. Information and control signals associated with UL control data is supplied to the control channel signal receiver 728 and data demodulator and decoder 732. A control channel signal indicating a sequence index and a time-domain cyclic shift value is provided to a channel estimator 730. Sequence index and a time-domain cyclic shift value allocated to the UE is used to generate a pilot sequence.

[0095] DEMUX 724 based on the timing information received from the controller 726 to the signal 722 received from Solutions P / S converter to multiplex the control channel signal, a data signal and a pilot signal. Demapper 718 according to LB / SB timing information and frequency allocation information received from the controller 726 to extract those signals from frequency resources.

[0096] At 710 upon receiving information from the UE comprising a control signal, CP remover 712 removes a CP from the received signal through an antenna. S / P converter 714 converts the CP-free signal to parallel signals and FFT processor 716 to the parallel signals by FFT processing. After demapping in demapper 718, FFT signal is converted into a time signal in an IFFT processor 720. IFFT processor 720, input / output size change received from the controller 726 according to a control signal. P / S converter 722 serialize the IFFT signals, and the serial signal DEMUX 724 demultiplexes the control channel signal, a pilot signal and a data signal.

[0097] Channel estimator 730 acquires a channel estimate received from the DEMUX 724 to the pilot signal. The signal receiver 728 channel by using the channel estimates received from the DEMUX 724 to the control channel signal for channel compensation, and gain control information sent by the UE. Data demodulator and decoder 732 by using the channel estimates received from the DEMUX 724 to channel compensation data signal, then acquires data transmitted by the UE based on the control information.

[0098] When only control information is transmitted without data on the UL, control channel signal receiver embodiment 728 described with reference to FIG 5 acquires control information.

[0099] FIG. 7B is a detailed block diagram illustrating a control channel signal receiver according to an embodiment of the present invention 728.

[0100] Referring to Figure 7B, control channel signal receiver 728 includes a correlator 740 and derandomizer 742. Correlator 744 sequence generator 740 generates a code sequence, e.g. ZC sequences used for the UE to generate I-bit control information. To do so, sequence generator 744 receives sequence information indicating a sequence length and a sequence index from controller 726. Node B and the UE are known sequence information.

[0101] conjugator 746 calculates the conjugate results ZC sequence (consequence). LB multiplier 748 by the basis of the control channel signal by conjugate sequences received from the DEMUX 724 to channel signals CDM demultiplexing. Accumulator 750 accumulates a signal received from the multiplier 748 to for a length of the ZC sequence. Channel compensator 752 using the estimated accumulation channel compensation signal from the channel estimator 730 receives the channel.

[0102] In derandomizer 742, an orthogonal code generator 754 generates orthogonal codes according to an orthogonal code information, the UE transmits the I-bit control information using orthogonal codes. To multiplier 758 through the LB-based channel compensation signal is multiplied by a chip orthogonal sequence. Accumulator 760 accumulate signal received from the multiplier 758 to for a number of I LB bit information is repeatedly mapped, thereby acquiring I-bit control information. Orthogonal code information is signaled from the Node B to the UE, so that the Node B and the UE are aware of the orthogonal code information.

[0103] In a modified embodiment of the present invention, channel compensator 752 is disposed between multiplier 758 and accumulator 760. Although 742 is arranged separately in FIG. 7B and the quadrature 740 derandomizer, but depending on the configuration method, sequence generator 740, correlator 744 and derandomizer 742 of the orthogonal code generator 754 may be combined in a single device. For example, if correlator 740 is configured so that sequence generator 744 generates a ZC sequence having LB-based orthogonal code is applied for each UE, the derandomizer 742 and multiplier 758 orthogonal code generator 754 not used. Accordingly, achieved is equivalent to the apparatus shown in FIG. 7B.

[0104] The second embodiment of the present invention a method of Equation (3) below 2.

[0105] FIG. 8 is a diagram showing the transmission mechanism in accordance with the control information of the present embodiment of the invention.

[0106] Referring to Figure 8, one slot includes a total of seven LB, and the fourth LB carries a pilot signal in each slot. Thus, a total of 14 sub-frames LB, LB and 2 are used for pilot transmission, LB 12 for control information transmission. Although one RU is used for transmitting control information, a plurality of RU may be used to support multiple users.

[0107] the same I-bit control information occurs 6 times in each slot, thus 12 times in one subframe. For frequency diversity, time slot-based frequency hopping is performed for the control information. In each LB carrying the control information, a random phase is applied to the ZC sequence. Randomized ZC sequence as a result of inter-cell interference randomization.

Random phase value [0108] is applied to the ZC sequence on an LB are Φ1; Φ2, ... Φ12 802 to 824 ZC sequence by ^ 1 (m = 1,2, ... 12), thus the phase rotation. Since a random phase sequence as a set of random phase values ​​LB is specific to the cell, so that inter-cell interference is randomized. That is, since between randomized ZC sequences used for LB, in different cells of the relevant subframe is a random phase rotation, the interference between the control channel from these cells is reduced.

[0109] Node B notifies the random phase sequence signals to the UE, so that the Node B and the UE are aware of the random phase sequence. To reduce inter-cell interference, a cell-specific random phase value can also be applied to the pilot signal. Node B to send a signal notifying the random phase value UE, so that the Node B and the UE are aware of the random phase sequence.

[0110] FIG. 9 is a diagram showing another transmission mechanism for control information according to an embodiment of the present invention.

[0111] Referring to FIG 9, one slot includes a total of six and two LB carries a pilot signal SB. Thus, a total of 12 sub-frames LB, SB and 4 are used for pilot transmission, LB 12 for control information transmission. The same I-bit control information occurs 6 times in each slot, thus 12 times in one subframe. For frequency diversity, time slot-based frequency hopping is performed for the control information. Random phase values ​​applied to the ZC sequence in LB is Φ1; Φ2, ... Φ12902 to 924.

[0112] FIGS. 1OA and FIG 1OB is a block diagram illustrating a transmitter of an embodiment of UE in accordance with the present invention.

[0113] Referring to Figure 10A, the transmitter includes a controller 1010, a pilot generator 1012, control channel signal generator 1014, data generator 1016, MUX 1017, S / P converter 1018, FFT processor 1019, the mapping device 1020, IFFT1022, P / S converter 1024, CP adder 1030, and an antenna 1032. And will not be described herein UL data transmission related parts and operation.

[0114] The controller for a transmitter operation 1010 provides overall control and generates MUX 1017, FFT processor 1019, mapper 1020, pilot generator 1012, control channel 1016 necessary for control signal generator 1014 and data generator signal. A control signal supplied to the pilot generator 1012 indicates a sequence index and a pilot generation of time-domain cyclic shift value, the pilot sequence index indicating a pilot signal sequence is assigned. UL control information and data transmission and a control signal is supplied to the associated control channel signal generator 1014 and data generator 1016.

[0115] MUX 1017 multiplexes guide 1012, data generator 1016 and the control channel signal generator 1014 receives pilot generator to the pilot signal, a data signal based on the timing information received from the controller 1010 to the control signal and indicated control channel signal for transmission in an LB or an SB. Mapper 1020 allocation information received from the controller 1010 to LB / SB timing information and frequency mapping multiplexed information to frequency resources.

[0116] When only control information is transmitted without data, control channel signal generator 1014 in the aforementioned method by LB basis to randomize the ZC sequence applied to the control information to generate a control channel signal.

[0117] S / P converter 1018 converts the multiplexed signal from MUX 1017 to parallel signals and provides them to FFT processor 1019. FFT processor 1019 input / output size according to a control signal received from the controller 1010 to change the. Mapper 1020 FFT signal from the FFT processor 1019 are mapped to frequency resources. IFFT processor 1022 converts the mapped frequency signals to time signals and P / S converter 1024 of the time-serial signal. CP adder 1030 is added to the serial signal CP, the CP and the signal transmitting through the transmitting antenna 1032 is added.

[0118] FIG 1OB is a detailed block diagram illustrating the control channel signal generator 1014 according to an embodiment of the present invention.

[0119] Referring to Figure 10B, control channel signal generator 1014 of the sequence generator 1042 generates a code sequence to be used for LB, such as ZC sequences. Each randomizer 1044 generates a random phase value LB, and the random phase value and the ZC sequence in each LB are multiplied. To do so, sequence generator 1042 from the controller 1010 receives sequence information such as a sequence length and a sequence index, and randomizer 1044 receives random sequence information about the LB for each of a random phase value from the controller 1010. Then, randomizer 1044 using the phase values ​​of random phase rotation to the ZC sequence in each LB, thereby randomizing the phase of the ZC sequence. Node B and the UE are known sequence information and random sequence information.

[0120] Control information generator 1040 generates modulation symbols having I-bit control information, and the repeater (repeater) 1043 repeats the control symbol to produce the LB number allocated to the control information of as many control symbols. LB multiplier 1046 by the control symbols based and randomized ZC sequence by multiplying the control symbols are multiplexed by CDM, thereby generating a control channel signal.

Effect [0121] The multiplier 1046] The symbol is based on output from repeater 1043 by the randomized ZC sequence randomized. By performing the equivalent to a randomized ZC sequence applied to the control device functions or symbols and control symbols ZC sequence randomized in combination instead of the multipliers 1046, it is contemplated that the modified embodiment of the present invention. For example, multiplier 1046 can be replaced with a phase rotator, the phase rotator according to the phase values ​​of the randomized ZC sequence Φπ * variable phase control symbols.

[0122] FIGS. 1lA and 1lB is a block diagram illustrating a receiver in the node B of the embodiment according to the present invention. [0123] 11A, the receiver includes an antenna 1110, CP remover 1112, S / P converter 1114, FFT processor 1116, a demapper 1118, IFFT processor 1120, P / S converter 1122, DEMUXl 124, controller 1126, control channel signal receiver 1128, channel estimator 1130 and data demodulator and decoder 1132. And will not be described herein UL data and receiving operation of the associated member.

[0124] The controller operation receiver 1126 pairs provide overall control. It also generates DEMUX 1124, IFFT processor 1120, demapper 1118, control channel signal receiver 1128, channel estimator 1130 and data demodulator and decoder control signal 1132 required. Information and control signals associated with UL control data is supplied to the control channel signal receiver 1128 and data demodulator and decoder 1132. A control signal indicating a sequence index and a time-domain cyclic shift value is provided to a channel estimator 1130, an index indicating the sequence assigned to the UE pilot sequence. Sequence index and a time-domain cyclic shift value are used for pilot reception.

[0125] DEMUX 1124 according to timing information received from the controller 1126 to 1122 received from the P / S converter to signal demultiplexing the control channel signal, a data signal and a pilot signal. Demapper 1118 according to the allocation information received from the controller 1126 to LB / SB timing information and frequency, extracts those signals from frequency resources.

[0126] In 1110 it received from the UE a control signal including the time information, CP remover 1112 removes a CP from a signal received through an antenna. S / P converter 1114 converts the CP-free signal to parallel signals and FFT processor 1116 of the parallel signal processing by the FFT. After processing in demapper 1118, FFT signal is converted into a time signal in an IFFT processor 1120. P / S converter 1122 serialize the IFFT signals and DEMUX 1124 demultiplexes the serial signal by a control channel signal, a pilot signal and a data signal.

[0127] Channel estimator 1130 acquires a channel estimate received from the DEMUX 1124 in a pilot signal. A control channel signal receiver 1128 channel estimate received from the DEMUX 1124 to the control channel signal for channel compensation, and gain control information sent by the UE. Data demodulator and decoder 1132 channel estimate from the received data signal to the DEMUX 1124 performs channel compensation, and then acquires data transmitted by the UE based on the control information.

[0128] When only control information is transmitted without data on the UL, control channel signal receiver 1128 mode with reference to FIGS. 8 and 9 described acquires control information.

[0129] FIG 1lB is a detailed block diagram illustrating a control channel signal receiver according to an embodiment of the present invention is 1128.

[0130] 11B, the control channel signal receiver 1128 includes a correlator 1140 and derandomizer 1142. Sequence generator 1140 correlator 1144 generates a code sequence, e.g. ZC sequences, for generating control information for the UE. To do so, sequence generator receives 11,441,126 sequence length and sequence information indicating the sequence index from the controller. Node B and the UE are known sequence information.

[0131] conjugator 1146 calculates the conjugate results ZC sequence (consequence). The multiplier 1148 received from DEMUX 1124 by the channel to the CDM signal LB based solution to the control channel signal and a conjugated sequence multiplied multiplexed. 1150 Cumulative Cumulative product signal for the length of the ZC sequence. 1148 correlator multiplier 1140 may be replaced by a phase rotator, the phase rotator according to the phase values ​​dk of the sequence received from sequence generator 1144 to the phase LB basis to change the control channel signal. 1152 using the channel compensator 1130 received from the channel estimator to estimate channel signal accumulation channel compensation.

[0132] In derandomizer 1142, a random value generator 1156 calculates the UE transmits a random sequence information conjugate random phase values ​​used for phase control value in accordance with the information. LB basis in the multiplier 1158 through the channel compensation signal and said phase conjugate of the value. Like multiplier 1046 as the transmitter, multiplier 1142 of derandomizer 1158 can be replaced by a phase rotator, according to the phase rotator or phase values ​​Am Φπ random sequence received from sequence generator 1156 to LB is in changing the phase of the signal channel basis.

[0133] accumulator accumulated signal received from the multiplier 1160 to 1158 for the number of I LB bit information is repeatedly mapped, thereby acquiring I-bit control information. Random sequence information is signaled from the Node B to the UE, so that the Node B and the UE are aware of the random sequence information.

[0134] In a modified embodiment of the present invention, channel compensator 1152 is disposed between multiplier 1158 and accumulator 1160. Although 1142 is arranged separately in FIG 1lB correlators 1140 and derandomizer, but depending on the configuration method of the correlator sequence generator 1140 1144 and derandomizer 1142 random value generator 1156 may be combined in a single device. For example, if correlator 1140 is configured so that sequence generator 1144 for each UE generates the ZC sequence applied to a random sequence, the derandomizer 1142 multiplier 1158 and random value generator 1156 is not used. Accordingly, achieved is equivalent to the apparatus shown in FIG 1lB. In this case, as in the transmitter as a multiplier, the multiplier 1140 of correlator 1148 can be replaced with a phase rotator, a phase value of the phase rotator 1144 based on the sequence received from the sequence generator to the ((4 + Φπ) or (dk + Am) phase in the symbol based channel change signal.

[0135] For each UE through a different phase value for each LB is provided, it can further improve the inter-cell interference randomization. Node B phase value of each LB to each UE is signaled.

[0136] In addition to being a random sequence is applied to the phase LB 12 I bit sequence carries control information and, in the second exemplary embodiment of the present invention may also be used such as quadrature phase sequence of the Fourier series. Fourier sequence of length N is defined as: .1nkn

[0138] In Equation (5), set different cell-specific value k for each cell. When the LB is based in performing phase rotation using a different Fourier sequence for each cell, between cells if timing is synchronized, if no inter-cell interference is present.

[0139] Example embodiments may be combined with a first and a second exemplary embodiment of the present invention. In the transport mechanism of FIG. 5, the I-bit control information carries LB and multiplies the orthogonal code, and then multiplied by a random phase sequence. Because of the random phase sequence is cell-specific, inter-cell interference can be reduced.

Method [0140] The third embodiment of the present invention described in equation (4) 3.

[0141] time domain cyclic shift value of a ZC sequence is cell-specific and changes in each LB carrying the control information, thereby randomizing inter-cell interference. More specifically, other than the cyclic shift value dk of each of the frequency resource in addition to the inherent applied to the same cell in the CDM control channel, also be applied in the time domain is applied to each cycle of LB-specific cell shift value Λπ. The Node B notifies the UE specific cyclic shift value signaling cell. The cell-specific cyclic shift value is set to be greater than the maximum delay of the radio transmission path, in order to maintain the orthogonality of the ZC sequence.

[0142] In order to reduce inter-cell interference, may be the cell-specific random time-domain cyclic shift values ​​applied to the pilot signal. Node B random time-domain cyclic shift value to signal the UE, so that the Node B and the UE knows the random time-domain cyclic shift sequence.

[0143] FIG 12Α is a diagram showing the transmission mechanism in accordance with the control information in an embodiment of the present invention.

[0144] Referring to FIG 12Α, one slot includes a total of seven LB, and the fourth LB carries a pilot signal in each slot. Thus, a total of 14 sub-frames LB, LB and 2 are used for pilot transmission, LB 12 for control information transmission. Although one RU is used for transmitting control information, a plurality of RU may be used to support multiple users. [0145] is applied to the ZC sequence of 12 random LB time domain cyclic shift value is A1, Λ2, ... A 12 1202 to 1224. Domain by a ZC sequence cyclic shift value of the random 1202-1224 in LB-based cyclic shift is to randomize

Control information.

[0146] FIG 12Β 12Α is a detail view of FIG. For the CDM different control channel within a cell and in the same time domain cyclic shift value dk (k is a control channel index) applies to each LB a, and interference between control information from a cell adjacent to randomize particular different time domain cyclic shift values ​​1202 to 1224 in the cell applied LB. S Jie, ZC sequence is used for each UE a time domain cyclic shift values ​​of cyclic shift in the cell further. Reference numerals 1230 and 1232 denote a sub-frame of the first and second slots. For convenience, the frequency hopping is not shown.

[0147] When additional randomization to use UE-specific time-domain cyclic shift, the time-domain cyclic shift values ​​1202 to 1204 indicate a UE-specific random sequence and dk and the time-domain cyclic shift values ​​1202 to maintaining orthogonality between the control channel within the same cell combination 1224.

[0148] FIG. 13 is a diagram showing another transmission mechanism for control information according to an embodiment of the present invention. Time domain cyclic shift value of a ZC sequence is 12 LB A1, A2, ... A 12 1302 to 1324. The cyclically shifted ZC sequence using a time-domain cyclic shift value of each LB in order to randomize control information.

[0149] In addition randomizer shown in FIG 1OB 1044 using a random domain cyclic shift LB basis to randomize the ZC sequence, and FIG random value generator shown in 1lB 1156 LB is calculated for each time-domain stochastic conjugated cyclic shift value of phase value to the multiplier 1158 and beyond, according to the third example of the present invention, the transmitter and a receiver of an embodiment in configuration and FIGS 1OA and 1OB and FIG 1lA and 1lB shown in the same configuration.

[0150] The first and third embodiments may be implemented in combination. That is, the transmission mechanism of FIG. 5, the control information, and orthogonal code are multiplied, and then again shifted sequence is multiplied LB basis and the random cycle, as shown in FIG. 13 or FIG. Because each cell for a random cyclic shift sequence is different, it is possible to reduce inter-cell interference.

[0151] It is clear from the above description, when the next generation multi-cell mobile communication system multiplexing the UL control information from different users, the present invention is by random phase in cell-based or UE-based or a cyclic shift value is applied to each block advantageously reduces inter-cell interference.

[0152] Although some have been shown with reference to a preferred embodiment of the present invention is shown and described embodiments of the present invention, they are merely preferred application. For example, embodiments of the present invention may be applied to the control information having a plurality of bits, for example, the CQI, and the I-bit control information. Further, the value of the random code sequence for controlling the information may be a predetermined resource block basis and applied to LB basis. Thus, those skilled in the art will appreciate that, without departing from the spirit and scope of the invention as defined by the appended claims, that various changes may be made in form and detail of the present invention.

Claims (20)

1. A method for single carrier multiple access SC-FDMA system method for transmitting control information in frequency division, comprising the steps of: generating different orthogonal sub-frame each comprise a plurality of different time slots of SC-FDMA symbols Wu code; carry control information by the control symbols and allocated for the control information code division multiplexing CDM sequence is generated by multiplying the control channel signal; and in SC-FDMA symbols based on the channel signal and the orthogonal code multiplied by chips, and transmit the control channel signal multiplied in the SC-FDMA symbol.

2. The method according to claim 1, wherein the combination of the orthogonal codes used in the subframe is different for each of the cells.

Wherein the combination of the orthogonal codes used in the subframe for each cell and each User Equipment UE in at least one of a different method of claim 1.

4. The method according to claim 1, wherein the sequence is a cell-specific ZadofT-Chu (ZC) sequence.

5. The method according to claim 1, wherein the generating the control channel signal comprises the number of the SC-FDMA symbols as many control symbols carrying the control information sequence and the randomized phase multiply.

6. A method for single carrier multiple access SC-FDMA system method for receiving control information in a frequency division, comprising the steps of: generating different orthogonal sub-frame each comprise a plurality of different time slots of SC-FDMA symbols Wu code; the received signal and a control channel allocated for the control information code division multiplexing CDM sequence conjugated sequence multiplied; and the control channels multiplied by SC-FDMA symbol basis signal and the orthogonal code multiplied chip, acquires the control information.

7. The method according to claim 6, wherein the combination of the orthogonal codes used in the subframe is different for each of the cells.

8. The method according to claim 6, wherein the combination of the orthogonal codes used in the subframe is different for at least one of each cell and each User Equipment UE.

9. The method as claimed in claim 6, wherein the sequence is a cell-specific ZadofT-Chu (ZC) sequence.

10. The method according to claim 6, wherein the control symbols comprise the obtaining the number of the SC-FDMA symbols as many forms and the control channel signal multiplied by the conjugate sequence.

11. A device information for a frequency division multiple access SC-FDMA transmission control system, in a single carrier comprising: a control channel signal generator for controlling by the control information symbols included and allocated for the control information code division multiplexing CDM sequence is generated by multiplying the control channel signal; orthogonal code generator for generating orthogonal codes of different sub-frame each comprise a plurality of different time slots Wu SC-FDMA symbols; a multiplier for to SC-FDMA symbols based on the control channel signal and the said multiplying orthogonal code chips; and a transmitter, for the SC-FDMA symbol transmitted multiplied the control channel signal.

12. The apparatus of claim 11, wherein the combination of the orthogonal codes used in the subframe is different for each of the cells.

13. The apparatus of claim 11, wherein the combination of the orthogonal codes used in the subframe is different for at least one of each cell and each User Equipment UE.

14. The apparatus of claim 11, wherein the sequence is a cell-specific Zadoff-Chu (ZC) sequence.

15. The apparatus of claim 11, wherein said phase control channel signal generator to the number of the SC-FDMA symbol sequence comprises as many control symbols of the control information and randomized multiply.

16. A method for single carrier frequency division multiple access apparatus information received SC-FDMA system control, comprising: a receiver for receiving a control channel signal comprising a control information; and a control channel signal receiver for the the control channel signal and the control channel signal and the sub-frame is multiplied code allocated for the control information sequence division multiplexing CDM sequence is multiplied by the conjugate, and to SC-FDMA symbols based on the respective chip comprising a plurality of different time slots of SC-FDMA symbols are multiplied by different orthogonal codes.

17. The apparatus according to claim 16, wherein the combination of the orthogonal codes used in the subframe is different for each of the cells.

18. The apparatus according to claim 16, wherein the combination of the orthogonal codes used in the subframe is different for at least one of each cell and each User Equipment UE.

19. The apparatus according to claim 16, wherein the sequence is a cell-specific Zadoff-Chu (ZC) sequence.

20. The apparatus according to claim 16, wherein the control channel signal receiver to the number of the SC-FDMA symbols as many control symbols forming the control channel signal and a conjugated sequence multiplied.