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

Abstract

Provided are a method and apparatus for transmitting and receiving control information in an SC-FDMA system. Different orthogonal codes are generated for different slots in a subframe, each containing multiple SC-FDMA symbols. A control channel signal is generated by multiplying control symbols carrying control information by a sequence of CDMs allocated for said control information. The control channel signal is multiplied by the chips of the orthogonal code on the basis of SC-FDMA symbols, and sent in the SC-FDMA symbols.

Description

Method and apparatus for transmitting and receiving control information of randomized inter-cell interference in mobile communication system

technical field

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

Background technique

In the field of mobile communication technology, recently Orthogonal Frequency Division Multiple Access (OFDMA) or Single Carrier Frequency Division Multiple Access (SingleCarrier-Frequency Division Multiple Access, SC-FDMA) has been studied for wireless communication on radio channels. High speed transmission. The asynchronous cellular mobile communication standardization organization, the 3rd Generation Partnership Project (3rdGeneration Partnership Project, 3GPP) is working on the long term evolution (Long Term Evolution, LTE) of the next generation mobile communication system related to the multiple access scheme.

According to data transmission or non-data transmission, the LTE system uses different transport formats (Transport Format, TP) for UL control information. When data and control information are simultaneously transmitted on the UL, the data and control information are multiplexed by time division multiplexing (TDM). If only control information is transmitted, a specific frequency band is allocated to the control information.

FIG. 1 shows a diagram of a transmission mechanism when only control information is transmitted on UL in a conventional LTE system. The horizontal axis represents time, while the vertical axis represents frequency. A subframe 102 is defined in time and a transmission (TX) bandwidth 120 is defined in frequency.

Referring to FIG. 1, the basic UL time transfer unit, a subframe 102, is 1 millisecond long and includes two slots 104 and 106, each 0.5 millisecond long. Each time slot 104 or 106 includes a plurality of long blocks (Long Block, LB) 108 (or long SC-FDMA symbols) and short blocks (Short Blocks, SB) 110 (or short SC-FDMA symbols). In the case shown in FIG. 1, a slot is configured with six LBs 108 and two SBs 110.

The smallest frequency transmission unit is the frequency tone (frequency tone) of the LB, and the basic resource allocation unit is the resource unit (Resource Unit, RU). Both RU 112 and RU 114 have multiple tones, here, for example, 12 tones form one RU. Frequency diversity can also be achieved by using discrete tones rather than continuous tones to form RUs.

Since the LB 108 and the SB 110 have the same sampling rate, the SB 110 has a tone size twice that of the LB 108. The number of tones allocated to one RU in the SB 110 is half the number of tones allocated to one RU in the LB 108. In the case shown in FIG. 1, LB 108 carries control information, while SB 108 carries pilot signals (or Reference Signals (RS)). A pilot signal is a predetermined sequence that a receiver uses to perform channel estimation for coherent demodulation.

If only control information is transmitted on UL, the control information is transmitted in a predetermined frequency band in the LTE system. In FIG. 1 , the frequency band is at least one of RU 112 and RU 114 located on either side of TX bandwidth 120.

Generally, a frequency band carrying control information is defined in units of RUs. When multiple RUs are required, contiguous RUs are used to satisfy single carrier characteristics. In order to increase frequency diversity for one subframe, here frequency hopping can occur on a slot basis.

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

The control information is, for example, feedback information indicating success or failure of downlink (DownLink, DL) data reception, that is, acknowledgment/negative acknowledgment (ACKnowledgment/NagativeACKnowledgment, ACK/NACK), which is generally 1 bit. It is repeated in multiple LBs to improve reception performance and extend cell coverage. When 1-bit control information is transmitted from different users, it may be considered that Code Division Multiplexing (Code Division Multiplexing, CDM) is used to multiplex the 1-bit control information. Compared with Frequency Division Multiplexing (FDM), the characteristic of CDM is the robustness against interference.

Zadoff-Chu (ZC) sequences are discussed as code sequences for CDM multiplexing of control information. Due to its constant envelope in time and frequency, the ZC sequence provides good peak-to-average power ratio (Peak-to-Average Power Ratio, PAPR) characteristics and excellent channel estimation performance in frequency. For UL transmission, PAPR is the most important consideration. A higher PAPR results in a smaller cell coverage, thus increasing the signal power requirement on the User Equipment (UE). Therefore, first efforts should be made to reduce PAPR in UL transmission.

A ZC sequence with good PAPR properties has a cyclic autocorrelation value of zero for non-zero shifts. Equation (1) below mathematically describes the ZC sequence.

Wherein, N represents the length of the ZC sequence, p represents the index of the ZC sequence, and n represents the index of the sample of the ZC sequence (n=0, . . . , N−1). Since p and N should be relatively prime, the number of sequence indices p varies with sequence length N. Therefore, for N=6, p=1,5, two ZC sequences are generated. If N is a prime number, N-1 sequences are generated.

Two ZC sequences with different p-values resulting from equation (1) have a complex cross-correlation whose absolute value is , the phase varies with p.

Control information from one user is distinguished from control information from other users by the ZC sequence, which will be described in more detail by way of example.

In the same cell, 1-bit control information from different UEs is identified by the time-domain cyclic shift value of the ZC sequence. The cyclic shift value is UE-specific to meet the condition that it is greater than the maximum transmission delay of the radio transmission path, thereby ensuring mutual orthogonality among UEs. Therefore, the number of UEs that can be accommodated for multiple access depends on the length of the ZC sequence and the cyclic shift value. For example, if the ZC sequence is 12 samples long, and the minimum cyclic shift value ensuring the orthogonality between ZC sequences is 2 samples, six UEs (=12/2) can obtain multiple access.

FIG. 2 shows a transmission mechanism in which control information from a UE is multiplexed by CDM.

Referring to FIG. 2, in cell 202 (cell A), first and second UEs 204 and 206 (UE#1 and UE#2) use the same ZC sequence in LB, that is, ZC#1, and for user identification respectively Cyclic shift ZC#1 by 0208 and Δ210. In the situation shown in Figure 2, in order to expand the coverage of the cell, both UE#1 and UE#2 repeat the modulation symbol of the expected (intended) 1-bit UL control information six times, that is, repeat it in six LBs The symbols are modulated, and the repeated symbols are multiplied by the cyclically shifted ZC sequence, ZC#1, in each LB to generate a control channel signal. Due to the cyclic autocorrelation property of the ZC sequence, these control channel signals remain orthogonal between UE#1 and UE#2 without interference. Δ210 is set to be larger than the maximum transmission delay of the radio transmission path. The two SBs in each slot carry pilots for coherent demodulation of control information. For illustration purposes, only one slot for control information is shown in FIG. 2 .

In cell 220 (cell B), the third and fourth UEs 222 and 224 (UE#3 and UE#4) use the same ZC sequence, ZC#2, in LB, and cycle ZC#2 for user identification, respectively Shift 0226 and Δ228. Due to the cyclic autocorrelation property of the ZC sequence, the control channel signals from UE#3 and UE#4 remain orthogonal between them without interference.

However, when the control channel signals of UEs from different cells use different ZC sequences, this control information transmission scheme causes interference between these cells. In FIG. 2 , UE#1 and UE#2 of cell A use different ZC sequences than UE#3 and UE#4 of cell B. The cross-correlation property of ZC sequences leads to interference between UEs that is proportional to the cross-correlation between ZC sequences. Therefore, there is a need for a method for reducing inter-cell interference caused by the transmission of control information as described above.

Contents of the invention

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

Another aspect of the present invention provides a method and apparatus for further randomizing inter-cell interference by applying a cell-specific or UE-specific random sequence to control information in a subframe.

Yet another aspect of the present invention provides a method and apparatus for notifying a UE of a random sequence of control information applied in a subframe through Layer 1/Layer 2 (L1/L2) signaling.

Yet another aspect of the present invention provides a method and apparatus for efficiently receiving control information in a subframe without inter-cell interference.

According to an aspect of the present invention, a method for transmitting control information in an SC-FDMA system is provided. Different orthogonal codes are generated for different slots in a subframe, each containing multiple SC-FDMA symbols. A control channel signal is generated by multiplying control symbols carrying control information by a sequence allocated for said control information CDM. The control channel signal is multiplied by the chips of the orthogonal code on an SC-FDMA symbol basis, and transmitted in the SC-FDMA symbol.

According to still another aspect of the present invention, a method for receiving control information in an SC-FDMA system is provided. Different orthogonal codes are generated for different slots in a subframe, each containing multiple SC-FDMA symbols. The received control channel signal is multiplied by the conjugate sequence of the sequence assigned to the CDM for said control information. The control information is obtained by multiplying the multiplied control channel signal and the chips of the orthogonal code on the basis of SC-FDMA symbols.

According to still another aspect of the present invention, an apparatus for transmitting control information in an SC-FDMA system is provided. The control channel signal generator generates a control channel signal by multiplying control symbols containing control information and a sequence of CDMs allocated for the control information. The transmitter generates different orthogonal codes for different time slots each containing a plurality of SC-FDMA symbols in the subframe, and compares the control channel signal with the chips of the orthogonal codes based on the SC-FDMA symbols and transmit the multiplied control channel signal in the SC-FDMA symbol.

According to still another aspect of the present invention, an apparatus for receiving control information in an SC-FDMA system is provided. A receiver receives a control channel signal including control information. The control channel signal receiver multiplies the control channel signal by the conjugate sequence of the CDM sequence allocated for the control information, and combines the multiplied control channel signal and The control information is obtained by multiplying chips of different orthogonal codes for different slots in a subframe, each containing a plurality of SC-FDMA symbols.

Description of drawings

The above and other aspects, features and advantages of certain exemplary embodiments of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a diagram illustrating a transmission mechanism for control information in a conventional LTE system;

Figure 2 shows the transmission mechanism in which the control information from the UE is multiplexed by CDM;

3 is a flowchart illustrating operations for transmitting control information in a UE according to an embodiment of the present invention;

4 is a flowchart illustrating operations for receiving control information in a Node B according to an embodiment of the present invention;

5 is a diagram illustrating a transmission mechanism of control information according to an embodiment of the present invention;

6A and 6B are block diagrams illustrating a transmitter in a UE according to an embodiment of the present invention;

7A and 7B are block diagrams illustrating a receiver in a Node B according to an embodiment of the present invention;

8 is a diagram illustrating a transmission mechanism for control information according to an embodiment of the present invention;

9 is a diagram illustrating another transmission mechanism for control information according to an embodiment of the present invention;

10A and 10B are block diagrams illustrating a transmitter in an MS according to an embodiment of the present invention;

11A and 11B are block diagrams illustrating a receiver in a Node B according to an embodiment of the present invention;

12A and 12B are diagrams illustrating a transmission mechanism for control information according to an embodiment of the present invention; and

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

Detailed ways

Preferred embodiments of the present invention are described in detail with reference to the accompanying drawings. It should be noted that similar components are indicated with similar reference numerals although shown in different drawings. Detailed descriptions of constructions or processes known in the art may be omitted to avoid obscuring the present invention.

Embodiments of the present invention provide transmission and reception operations of a UE and a Node B in a case where UL control information from a plurality of UEs is multiplexed over a predetermined frequency area of a system frequency band.

Embodiments of the present invention will be described in the context of CDM transmission of control information from multiple UEs in an SC-FDMA cellular communication system. Embodiments of the invention are also applicable to multiplexing that do not share specific time-frequency resources, such as FDM or TDM transmission of control information. CDM may be one of various CDMA schemes including time-domain CDMA and frequency-domain CDM.

For CDM, the ZC sequence is used, although any other code sequence with similar properties could be used. The control information is 1-bit control information, such as ACK/NACK here. However, the method for reducing inter-cell interference of the present invention is also applicable to control information with multiple bits, such as Channel Quality Indicator (CQI). In this case, each bit of control information is transmitted in one SC-FDMA symbol. The inter-cell interference reduction method is also applicable to CDM transmission of different types of control information, such as 1-bit control information and control information with multiple bits.

Inter-cell interference occurs when UEs in neighboring cells transmit their control information using different ZC sequences of length N in M SC-FDMA symbols, ie, M LBs as UL time transmission units.

If the phases of the correlations between sequences in LBs from UEs in neighboring cells are randomized while maintaining the cyclic autocorrelation and cross-correlation properties of the ZC sequences, at the receiver the phase of the inter-neighboring cell interference is carried The accumulation period of LBs of control information of a subframe is randomized across LBs, thereby reducing average interference power.

According to the embodiment of the present invention, each UE generates its ZC sequence based on the LB in the subframe, and applies a random sequence with a random phase or a random cyclic shift value to the ZC sequence in each LB, thereby randomizing The ZC sequence. Then, the UE sends control information using the randomized ZC sequence. The random sequence is cell-specific. Interference randomization is further improved using a different random sequence of phase values or cyclic shift values for each UE.

Embodiments of the present invention propose three methods. In the following description, a ZC sequence of length N is denoted by g _p (n). The ZC sequence g _p (n) is randomized on M LBs, and the control information is multiplied by the randomized (randomized) ZC sequence g′ _p,m,k (n), where k represents the channel carrying the control information index.

Equation (2) describes the randomized ZC sequence according to Method 1.

g' _{p, m, k} (n) = g _p ((n+d _k ) mod N) S _{M, m} ,

(m=1, 2,..., M, n=0, 1, 2..., N-1).....(2)

Wherein, d _k represents the cyclic shift value of the same ZC sequence, and d _k identifies the channel k carrying the control information. The cyclic shift value is preferably a time domain cyclic shift value, although it could be a frequency domain cyclic shift value. In Equation (2), mod stands for modulo operation. For example, A mod B means the remainder when A is divided by B.

S _{M, m} represents an orthogonal code of length M, which is +1s or -1s. This orthogonal code may be a Walsh code. m represents the index of the LB to which the control information is mapped. If the control information is repeated four times in the slots of the subframe, the chips of the Walsh sequence of length 4 are multiplied by the LB of each slot one by one, and the Walsh sequence of two slots in the subframe The combination of Ersh sequences is different for each cell, thus randomizing the inter-cell interference. For additional randomization, different combinations of Walsh sequences can be used for each UE.

Equation (3) describes the randomized ZC sequence according to method 2.

${\mathrm{<span\; class="notranslate">\; g</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; k</span>}}^{<span\; class="notranslate">\; \&prime;</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; g</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}<span\; class="notranslate">\; (</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; mod</span>}\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; e</span>}}^{\mathrm{<span\; class="notranslate">\; j</span>}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}}<span\; class="notranslate">\; ,</span>$

(m=1, 2,..., M, n=0, 1, 2..., N-1)....(3)

Among them, φ _m represents a random phase value changing the phase of the ZC sequence g _p (n) in each LB. The inter-cell interference is randomized by using different sets of random phase values, ie different random phase sequences {φ _m }, for neighboring cells in the LB of a subframe.

Equation (4) describes the randomized ZC sequence according to method 3.

g' _{p, m, k} (n) = g _p ((n+d _k +Δ _m ) mod N),

(m=1, 2,..., M, n=0, 1, 2..., N-1).....(4)

Wherein, Δ _m represents a random cyclic shift value that changes the time-domain cyclic shift value d _k of the ZC sequence g _p (n) in each LB. Inter-cell interference is randomized by using different sets of random time-domain cyclic shift values, ie different random time-domain cyclic shift sequences {Δ _m }, for neighboring cells in the LB of a subframe. Although here random cyclic shift values are used in the time domain, they can be adapted for use in the frequency domain.

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

Referring to FIG. 3 , the UE receives sequence information and random sequence information from the Node B through signaling in step 302 . The sequence information is about a ZC sequence for use in transmitting control information, including an index and a cyclic shift value of the ZC sequence. The random sequence information is used to randomize the ZC sequence, including a random phase sequence as a set of random phase values or a random time-domain cyclic shift sequence as a set of random time-domain cyclic shift values to supply the LB for a subframe . The signaling is upper layer (eg L2) signaling or physical layer (L1) signaling. To randomize inter-cell interference, the random phase sequence or random time-domain cyclic shift sequence is different for each cell. For further interference randomization, a random phase sequence or a random time-domain cyclic shift sequence can also be set to be different for each UE.

In step 304, the UE generates control information and uses the control information to generate complex-valued modulation symbols (hereinafter referred to as control symbols). The number of control symbols is equal to the number of LBs allocated for transmission of control information. For example, if the control information is 1 bit, the UE generates as many control symbols as the number of allocated LBs by repetition.

In step 306, the UE generates a ZC sequence using the index and cyclic shift value included in the sequence information. Then, in step 308, the UE generates a random value according to the random phase sequence or the random time domain cyclic shift sequence included in the random sequence information. Random values are Walsh sequences, random phase values, or random time-domain cyclic shift values. These random values are different for each cell and/or each UE. In step 310, the UE generates a randomized ZC sequence by applying a random value to the ZC sequence based on LB. In step 312, the UE multiplies the randomized ZC sequence and the control symbols, maps the product to LBs, and transmits the mapped LBs.

FIG. 4 is a flowchart illustrating operations for receiving control information in a Node B according to an embodiment of the present invention.

Referring to FIG. 4, in step 402, the Node B obtains a correlated signal by correlating a signal received from a prospective UE with a ZC sequence applied to the signal in a plurality of LBs. In step 404, the Node B performs channel estimation on the pilot signal received from the UE, and performs channel compensation on the correlated signal using the channel estimation. In step 406, the Node B acquires control information by removing the random value from the channel-compensated correlation signal by applying a random value corresponding to the UE to the channel-compensated correlation signal on an LB basis. The random value corresponding to the UE is known from the random sequence information sent by the Node B to the UE.

In the above sending and receiving of control information, LB (ie, SC-FDMA symbol) is a basic unit, and control information is mapped to this basic unit for transmission. The ZC sequence is repeated in units of LB, and elements of a random phase sequence or a random time-domain cyclic shift sequence vary LB by LB.

In case multiple cells exist under the same Node B, UEs in each cell multiplex their control channels using the same ZC sequence and different time-domain cyclic shift values. If different random phase sequences or random time-domain cyclic shift sequences are used on an LB basis in a Node B cell, orthogonality may be lost among UEs. Therefore, in this environment, the random phase sequence or the random time-domain cyclic shift sequence is specific to the Node B, and the cells of the Node B use the same random sequence.

The first embodiment of the present invention implements method 1 described in equation (2).

Fig. 5 shows the transmission mechanism of control information according to the first embodiment of the present invention.

Referring to FIG. 5, in one subframe, the same 1-bit control information appears 8 times and is subjected to frequency hopping on a slot basis in order to achieve frequency diversity. If in each slot, two SBs and the first and last LBs carry pilots for channel estimation, the remaining LBs of the slot can be used to transmit control information. Although here one RU is used to transmit control information, multiple RUs may be used to support multiple users.

In the first slot, the modulation symbol carrying 1-bit control information appears 4 times for transmission in four LBs, and is multiplied by an orthogonal code S1502 of length 4 (=S1 _{4, 1} S1 _{4, 2} S1 4 _{, 3} S1 4 _{, 4} ). S1 _{4, x} represents the chip x of the orthogonal code S1. The pilot sequence is also multiplied by an orthogonal code S1' 504 of length 4 (= S1' _4,1 S1' _4,2 S1' _4,3 S1' _4,4 ) on the basis of LB or SB. Using orthogonal codes can increase the number of multiple-access users. For example, for length 4, four orthogonal codes are available. Using four orthogonal codes can make the number of users accommodated in the same time-frequency resource four times that of using no orthogonal codes.

In the second time slot, 1-bit control information appears four times, and is multiplied by an orthogonal code S2 506 of length 4 (=S2 _4,1 S2 _4,2 S2 _4,3 S2 _4,4 ) on the basis of LB . The pilot sequence is also multiplied on the basis of LB or SB by an orthogonal code S2' 508 of length 4 (=S2' _4,1 S2' _4,2 S2' _4,3 S2' _4,4 ).

The Node B signals the orthogonal codes S1 502, S1'504, S2506 and S2'508 to the UE. Due to the nature of the orthogonal code, its length should be a multiple of 4. In FIG. 5, an orthogonal code of length 4 is applied to each slot. If frequency hopping does not occur on a slot basis in the transmission mechanism of FIG. 5 , it can be considered that the control information undergoes a negligibly small channel change in frequency during the transmission of one subframe. Therefore, even if the length of the orthogonal code is extended to one subframe, the orthogonality is maintained. In this case, an orthogonal code of length 8 may be used to transmit control information in one subframe.

Different combinations of orthogonal codes to be applied to slots of one subframe are set for each cell in order to randomize inter-cell interference. For example, to transmit control information in a slot, cell A sequentially uses orthogonal codes {S1, S2}, and cell B sequentially uses orthogonal codes {S3, S4}. The orthogonal code combination {S3, S4} includes at least one orthogonal code different from the orthogonal code combination {S1, S2}.

6A and 6B are block diagrams illustrating a transmitter in a UE according to an exemplary embodiment of the present invention.

Referring to FIG. 6A, the transmitter includes a controller 610, a pilot generator 612, a control channel signal generator 614, a data generator 616, a multiplexer (Multiplexer, MUX) 617, a serial-to-parallel (Serial-to-Parallel, S /P) converter 618, Fast Fourier Transform (FFT) processor 619, mapper 620, inverse Fast Fourier Transformer (IFFT) 622, parallel-to-serial (Parallel-to-Serial, P/S) converter 624, positive Intersection code generator 626 , multiplier 628 , cyclic prefix (Cyclic Prefix, CP) adder (adder) 630 and antenna 632 . Components and operations related to UL data transmission will not be described here.

Controller 610 provides overall control over the 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 generator 626 required control signal. The control signal provided to the pilot generator 612 indicates the sequence index and time domain cyclic shift value to be used to generate the pilot sequence. Control signals associated with UL control information and data transmissions are provided to a control channel signal generator 614 and a data generator 616 .

MUX 617 multiplexes pilot signals, data signals, and control channels received from pilot generator 612, data generator 616, and control channel signal generator 614 according to timing information indicated by control signals received from controller 610 signal for transmission in LB or SB. The mapper 620 maps the multiplexed signal to frequency resources according to the LB/SB timing information and frequency allocation information received from the controller 610 .

When only control information is transmitted without data, the orthogonal code generator 626 generates a cell-specific or UE-specific orthogonal code for the LB/ The orthogonal code of the SB, and apply the chips of the orthogonal code to the control symbols of the control channel signal mapped to the LB according to the timing information received from the controller 610. Orthogonal code information is provided to the controller 610 through Node B signaling.

The S/P converter 618 converts the multiplexed signal from the MUX 617 into a parallel signal, and supplies it to the FFT processor 619. The input/output size of the FFT processor 619 varies according to the control signal received from the controller 610 . The mapper 620 maps the FFT signal from the FFT processor 619 to frequency resources. The IFFT processor 622 converts the mapped frequency signal into a time signal, and the P/S converter 624 serializes the time signal. The multiplier 628 multiplies the serial time signal by the orthogonal code generated from the orthogonal code generator 626 . That is, the orthogonal code generator 626 generates an orthogonal code to be applied to a slot of a subframe that will carry control information according to timing information received from the controller 610 .

The CP adder 630 adds CP to the signal received from the multiplier 628 to avoid inter-symbol interference, and transmits the CP-added signal through the transmit antenna 632 .

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

Referring to FIG. 6B, the sequence generator 642 of the control channel signal generator 614 generates a code sequence, such as a ZC sequence, on an LB basis. To do so, sequence generator 642 receives sequence information from controller 610, such as sequence length and sequence index. The sequence information is known to both the Node B and the UE.

The control information generator 640 generates modulation symbols having 1-bit control information, and the repeater 643 repeats the control symbols to generate as many control symbols as the number of LBs allocated to the control information. The multiplier 646 CDM-multiplexes the control symbols by multiplying the control symbols by the ZC sequence on an LB basis, thereby generating a control channel signal.

The role of the multiplier 646 is to generate a user multiplexed control channel signal by multiplying the symbols output from the repeater 643 by the ZC sequence. Modified embodiments of the invention are conceivable by replacing the multiplier 646 with an equivalent device.

7A and 7B are block diagrams illustrating a receiver in a Node B according to an embodiment of the present invention.

7A, the receiver includes an antenna 710, a CP remover 712, an S/P converter 714, an FFT processor 716, a demapper 718, an IFFT processor 720, a P/S converter 722, a demultiplexer (DEMUX ) 724, controller 726, control channel signal receiver 728, channel estimator 730, and data demodulator and decoder 732. Components and operations associated with UL data reception will not be described here.

A controller 726 provides overall control over the operation of the receiver and generates the required signals for the DEMUX 724, IFFT processor 720, demapper 718, control channel signal receiver 728, channel estimator 730, and data demodulator and decoder 732. control signal. Control signals related to UL control information and data are provided to 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 . The sequence index and time domain cyclic shift value are used to generate the pilot sequence assigned to the UE.

The DEMUX 724 demultiplexes the signal received from the P/S converter 722 into a control channel signal, a data signal, and a pilot signal according to timing information received from the controller 726. The demapper 718 extracts those signals from the frequency resources based on the LB/SB timing information and frequency allocation information received from the controller 726 .

Upon receiving a signal including control information from the UE through the antenna 710, the CP remover 712 removes the CP from the received signal. The S/P converter 714 converts the CP-free signal into a parallel signal, and the FFT processor 716 processes the parallel signal through FFT. After demapping in demapper 718 , the FFT signal is converted into a time signal in IFFT processor 720 . The input/output size of the IFFT processor 720 varies according to the control signal received from the controller 726 . P/S converter 722 serializes the IFFT signal, and DEMUX 724 demultiplexes the serial signal into control channel signals, pilot signals and data signals.

Channel estimator 730 obtains channel estimates from pilot signals received from DEMUX 724. The control channel signal receiver 728 uses the channel estimation to perform channel compensation on the control channel signal received from the DEMUX 724, and obtains the control information sent by the UE. The data demodulator and decoder 732 uses the channel estimate to perform channel compensation on the data signal received from the DEMUX 724, and then obtains the data transmitted by the UE based on the control information.

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

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

Referring to FIG. 7B , the control channel signal receiver 728 includes a correlator 740 and a de-randomizer 742 . The sequence generator 744 of the correlator 740 generates a code sequence, such as a ZC sequence, for the UE to generate 1-bit control information. To do so, sequence generator 744 receives sequence information from controller 726 indicating sequence length and sequence index. The sequence information is known to both the Node B and the UE.

The conjugator 746 calculates the conjugation result (consequence) of the ZC sequence. Multiplier 748 CDM-demultiplexes the control channel signal received from DEMUX 724 by multiplying the control channel signal by the conjugated sequence on an LB basis. Accumulator 750 accumulates the signal received from multiplier 748 for the length of the ZC sequence. Channel compensator 752 uses the channel estimate received from channel estimator 730 to perform channel compensation on the accumulated signal.

In the de-randomizer 742, an orthogonal code generator 754 generates an orthogonal code according to the orthogonal code information, and the UE uses the orthogonal code to send 1-bit control information. The multiplier 758 multiplies the channel compensated signal by the chips of the orthogonal sequence on an LB basis. The accumulator 760 accumulates the signal received from the multiplier 758 for the number of LBs to which 1-bit information is repeatedly mapped, thereby acquiring 1-bit control information. The orthogonal code information is signaled from the Node B to the UE so that both the Node B and the UE are aware of the orthogonal code information.

In a modified embodiment of the invention, the channel compensator 752 is placed between the multiplier 758 and the accumulator 760 . Although in FIG. 7B the orthogonalizer 740 and the derandomizer 742 are configured separately, depending on the configuration method, the sequence generator 744 of the correlator 740 and the orthogonal code generator 754 of the derandomizer 742 may be combined in a single device. For example, if the correlator 740 is configured such that the sequence generator 744 generates a ZC sequence with an orthogonal code applied on a LB basis for each UE, the multiplier 758 of the de-randomizer 742 and the orthogonal code generator 754 is not used. Thus, a device equivalent to that shown in Fig. 7B is realized.

A second embodiment of the present invention implements method 2 described in equation (3).

FIG. 8 is a diagram illustrating a transmission mechanism of control information according to an embodiment of the present invention.

Referring to FIG. 8, one slot includes a total of 7 LBs, and the fourth LB carries a pilot signal in each slot. Therefore, one subframe has 14 LBs in total, and 2 LBs are used for pilot transmission and 12 LBs are used for control information transmission. Although here one RU is used to transmit control information, multiple RUs may be used to support multiple users.

The same 1-bit control information appears 6 times in each slot, thus appears 12 times in a subframe. Frequency hopping is performed on control information on a slot basis for frequency diversity. In each LB carrying control information, a random phase is applied to the ZC sequence. The resulting randomization of the ZC sequence randomizes the inter-cell interference.

The random phase values applied to the ZC sequence in LB are φ ₁ , φ ₂ , . . . φ ₁₂ 802 to 824. The ZC sequence is multiplied by (m=1, 2, . . . 12), thus being phase rotated. Inter-cell interference is randomized because the random phase sequence used for LB as a set of random phase values is cell-specific. That is, since the correlation between randomized ZC sequences of LBs for different cells is randomly phase-rotated over one subframe, interference between control channels from these cells is reduced.

The Node B signals the random phase sequence to the UE so that both the Node B and the UE are aware of the random phase sequence. To reduce inter-cell interference, cell-specific random phase values may also be applied to the pilot signals. The Node B signals the random phase value to the UE so that both the Node B and the UE are aware of the random phase sequence.

FIG. 9 is a diagram illustrating another transmission mechanism of control information according to an embodiment of the present invention.

Referring to FIG. 9 , one slot includes a total of 6 LBs and 2 SBs carrying pilot signals. Therefore, one subframe has 12 LBs in total, and 4 SBs are used for pilot transmission, and 12 LBs are used for control information transmission. The same 1-bit control information appears 6 times in each slot, thus appears 12 times in a subframe. Frequency hopping is performed on control information on a slot basis for frequency diversity. The random phase values applied to the ZC sequence in LB are φ ₁ , φ ₂ , . . . φ ₁₂ 902 to 924.

10A and 10B are block diagrams illustrating a transmitter in a UE according to an embodiment of the present invention.

Referring to Figure 10A, the transmitter includes a controller 1010, a pilot generator 1012, a control channel signal generator 1014, a data generator 1016, a MUX 1017, an S/P converter 1018, an FFT processor 1019, a mapper 1020, IFFT 1022, P/S converter 1024, CP adder 1030 and antenna 1032. Components and operations related to UL data transmission will not be described here.

Controller 1010 provides overall control over the operation of the transmitter and generates the control signals required by MUX 1017, FFT processor 1019, mapper 1020, pilot generator 1012, control channel signal generator 1014 and data generator 1016. A control signal supplied to the pilot generator 1012 indicates a sequence index indicating an allocated pilot signal sequence and a time-domain cyclic shift value for pilot generation. Control signals associated with UL control information and data transmissions are provided to a control channel signal generator 1014 and a data generator 1016 .

MUX 1017 multiplexes the pilot signal, data signal and control channel signal received from pilot generator 1012, data generator 1016 and control channel signal generator 1014 according to the timing information indicated by the control signal received from controller 1010 , for transmission in LB or SB. The mapper 1020 maps the multiplexed information to frequency resources according to the LB/SB timing information and frequency allocation information received from the controller 1010 .

When only control information is transmitted without data, the control channel signal generator 1014 generates a control channel signal by applying a ZC sequence randomized on an LB basis to the control information in the foregoing method.

The S/P converter 1018 converts the multiplexed signal from the MUX 1017 into a parallel signal, and supplies it to the FFT processor 1019. The input/output size of the FFT processor 1019 varies according to the control signal received from the controller 1010 . The mapper 1020 maps the FFT signal from the FFT processor 1019 to frequency resources. The IFFT processor 1022 converts the mapped frequency signal into a time signal, and the P/S converter 1024 serializes the time signal. The CP adder 1030 adds CP to the serial signal, and transmits the CP-added signal through the transmit antenna 1032 .

FIG. 10B is a detailed block diagram illustrating the control channel signal generator 1014 according to an embodiment of the present invention.

Referring to FIG. 10B , the sequence generator 1042 of the control channel signal generator 1014 generates a code sequence, such as a ZC sequence, to be used for LB. The randomizer 1044 generates a random phase value for each LB, and multiplies the random phase value with the ZC sequence in each LB. To do so, the sequence generator 1042 receives sequence information, such as sequence length and sequence index, from the controller 1010, and the randomizer 1044 receives random sequence information from the controller 1010 on a random phase value for each LB. Then, the randomizer 1044 rotates the phase of the ZC sequence with a random phase value in each LB, thereby randomizing the phase of the ZC sequence. Both the Node B and the UE know the sequence information and the random sequence information.

The control information generator 1040 generates modulation symbols having 1-bit control information, and a repeater (repeater) 1043 repeats the control symbols to generate as many control symbols as the number of LBs allocated to the control information. The multiplier 1046 CDM-multiplexes the control symbols by multiplying them with the randomized ZC sequence on an LB basis, thereby generating a control channel signal.

The role of the multiplier 1046 is to randomize the symbols output from the repeater 1043 on a symbol basis by randomizing the ZC sequence. Modified embodiments of the invention can be envisaged by replacing the multiplier 1046 with a device performing a function equivalent to applying a randomized ZC sequence to a control symbol or combining a randomized ZC sequence and a control symbol. For example, multiplier 1046 can be replaced by a phase rotator that changes the phase of the control symbols according to the phase value _φm or _Δm of the randomized ZC sequence.

11A and 11B are block diagrams illustrating a receiver in a Node B according to an embodiment of the present invention.

11A, the receiver includes an antenna 1110, a CP remover 1112, an S/P converter 1114, an FFT processor 1116, a demapper 1118, an IFFT processor 1120, a P/S converter 1122, a DEMUX 1124, a controller 1126, Control channel signal receiver 1128 , channel estimator 1130 and data demodulator and decoder 1132 . Components and operations associated with UL data reception will not be described here.

Controller 1126 provides overall control over the operation of the receiver. It also generates the control signals required by DEMUX 1124, IFFT processor 1120, demapper 1118, control channel signal receiver 1128, channel estimator 1130, and data demodulator and decoder 1132. Control signals related to UL control information and data are provided to a control channel signal receiver 1128 and a data demodulator and decoder 1132 . A control signal indicating a sequence index indicating a pilot sequence allocated to a UE and a time-domain cyclic shift value is provided to the channel estimator 1130 . Sequence index and time domain cyclic shift value are used for pilot reception.

The DEMUX 1124 demultiplexes the signal received from the P/S converter 1122 into a control channel signal, a data signal, and a pilot signal according to timing information received from the controller 1126. The demapper 1118 extracts those signals from the frequency resources based on the LB/SB timing information and frequency allocation information received from the controller 1126 .

Upon receiving a signal including control information from the UE through the antenna 1110, the CP remover 1112 removes the CP from the received signal. The S/P converter 1114 converts the CP-free signal into a parallel signal, and the FFT processor 1116 processes the parallel signal through FFT. After processing in demapper 1118 , the FFT signal is converted into a time signal in IFFT processor 1120 . P/S converter 1122 serializes the IFFT signal, and DEMUX 1124 demultiplexes the serial signal into control channel signals, pilot signals, and data signals.

Channel estimator 1130 obtains channel estimates from pilot signals received from DEMUX 1124. The control channel signal receiver 1128 uses channel estimation to perform channel compensation on the control channel signal received from the DEMUX 1124, and obtains the control information sent by the UE. The data demodulator and decoder 1132 uses channel estimation to perform channel compensation on the data signal received from the DEMUX 1124, and then acquires the data transmitted by the UE based on the control information.

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

FIG. 11B is a detailed block diagram illustrating the control channel signal receiver 1128 according to an embodiment of the present invention.

Referring to FIG. 11B , the control channel signal receiver 1128 includes a correlator 1140 and a de-randomizer 1142 . The sequence generator 1144 of the correlator 1140 generates a code sequence, such as a ZC sequence, for the UE to generate control information. To do so, sequence generator 1144 receives sequence information from controller 1126 indicating sequence length and sequence index. The sequence information is known to both the Node B and the UE.

The conjugator 1146 calculates the conjugation result (consequence) of the ZC sequence. The multiplier 1148 CDM-demultiplexes the control channel signal received from the DEMUX 1124 by multiplying the control channel signal and the conjugated sequence on an LB basis. The accumulator 1150 accumulates the product signal for the length of the ZC sequence. The multiplier 1148 of the correlator 1140 may be replaced by a phase rotator that changes the phase of the control channel signal on an LB basis according to the phase value d _k of the sequence received from the sequence generator 1144 . Channel compensator 1152 performs channel compensation on the accumulated signal using the channel estimate received from channel estimator 1130 .

In the de-randomizer 1142, the random value generator 1156 calculates the conjugate phase value of the random phase value used when the UE sends the control information according to the random sequence information. A multiplier 1158 multiplies the channel compensated signal by the conjugate phase value on an LB basis. Like the multiplier 1046 of the transmitter, the multiplier 1158 of the de-randomizer 1142 can be replaced by a phase rotator that takes the phase value _φm or _Δm of the random sequence received from the sequence generator 1156 by The phase of the control channel signal is changed based on the LB.

The accumulator 1160 accumulates the signal received from the multiplier 1158 for the number of LBs to which 1-bit information is repeatedly mapped, thereby acquiring 1-bit control information. The random sequence information is signaled from the Node B to the UE so that both the Node B and the UE are aware of the random sequence information.

In a modified embodiment of the invention, the channel compensator 1152 is placed between the multiplier 1158 and the accumulator 1160 . Although the correlator 1140 and the derandomizer 1142 are configured separately in FIG. in the device. For example, if the correlator 1140 is configured such that the sequence generator 1144 generates a ZC sequence to which a random sequence is applied for each UE, the multiplier 1158 and the random value generator 1156 of the de-randomizer 1142 are not used. Thus, a device equivalent to that shown in FIG. 11B is realized. In this case, like the multiplier in the transmitter, the multiplier 1148 of the correlator 1140 can be replaced by a phase rotator, which is based on the phase value of the sequence received from the sequence generator 1144 (d _k +φ _m ) or (d _k +Δ _m ) changes the phase of the control channel signal on a symbol basis.

By setting different phase values for each LB for each UE, the randomization of inter-cell interference can be further improved. The Node B signals the phase value of each LB to each UE.

In addition to a random sequence as a phase sequence applied to 12 LBs carrying 1-bit control information, an orthogonal phase sequence such as a Fourier sequence may also be used in the second exemplary embodiment of the present invention. A Fourier sequence of length N is defined as:

${\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; e</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; j</span>}\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;kn</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span>\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

In equation (5), a different cell-specific value k is set for each cell. When phase rotation is performed on an LB basis using a different Fourier sequence for each cell, there is no interference between cells if the timing is synchronized between cells.

The first and second exemplary embodiments of the present invention can be implemented in combination. In the transmission mechanism of FIG. 5 , the LB carrying 1-bit control information is multiplied by an orthogonal code, and then multiplied by a random phase sequence. Because the random phase sequence is cell-specific, inter-cell interference can be reduced.

A third embodiment of the present invention implements method 3 described in equation (4).

The time-domain cyclic shift value of the ZC sequence is cell-specific and varies in each LB carrying control information, thereby randomizing the inter-cell interference. More specifically, in addition to the cyclic shift value _dk applied to each of the control channels CDM-multiplexed in the same frequency resource within the cell, a cell-specific Cyclic shift value Δ _m . The Node B signals the cell-specific cyclic shift value to the UE. The cell-specific cyclic shift value is set larger than the maximum delay of the radio transmission path in order to preserve the orthogonality of the ZC sequences.

To reduce inter-cell interference, a cell-specific random time-domain cyclic shift value may also be applied to the pilot signal. The Node B signals the random time domain cyclic shift value to the UE so that both the Node B and the UE know the random time domain cyclic shift sequence.

FIG. 12A is a diagram illustrating a transmission mechanism of control information according to an embodiment of the present invention.

Referring to FIG. 12A, one slot includes a total of 7 LBs, and the fourth LB carries a pilot signal in each slot. Therefore, one subframe has 14 LBs in total, and 2 LBs are used for pilot transmission and 12 LBs are used for control information transmission. Although here one RU is used to transmit control information, multiple RUs may be used to support multiple users.

The random time-domain cyclic shift values applied to the 12 LBs of the ZC sequence are Δ ₁ , Δ ₂ , . . . Δ ₁₂ 1202 to 1224. The ZC sequence is cyclically shifted on an LB basis by random time domain cyclic shift values 1202 to 1224 in order to randomize the control information.

Figure 12B is a detailed view of Figure 12A. For CDM multiplexing of different control channels within a cell, the same time-domain cyclic shift value _dk (k is the control channel index) is applied to each LB, and in order to randomize the interference between control information from adjacent cells, Different cell-specific time-domain cyclic shift values 1202 to 1224 are applied to the LB. That is, the ZC sequence is additionally cyclically shifted by the time-domain cyclic shift value for each UE in the cell. Reference numerals 1230 and 1232 denote first and second slots in one subframe, respectively. Frequency hopping is not shown for convenience.

When a UE-specific time-domain cyclic shift is used for additional randomization, the time-domain cyclic shift values 1202 to 1204 indicate a UE-specific random sequence, and the _dk and time-domain cyclic shift values 1202 to 1224 Combining maintains orthogonality between control channels within the same cell.

FIG. 13 is a diagram illustrating another transmission mechanism of control information according to an embodiment of the present invention. The time-domain cyclic shift values of the ZC sequence of 12 LBs are Δ ₁ , Δ ₂ , . . . Δ ₁₂ 1302 to 1324. The ZC sequence is cyclically shifted by a time-domain cyclic shift value in each LB to randomize the control information.

Except that the randomizer 1044 shown in FIG. 10B randomizes the ZC sequence on an LB basis with a random time-domain cyclic shift, and the random value generator 1156 shown in FIG. 11B calculates a random time-domain cyclic shift for each LB value and provide it to the multiplier 1158, the transmitter and receiver according to the third example embodiment of the present invention are configured as shown in Fig. 10A and Fig. 10B and Fig. 11A and Fig. 11B The configuration is the same.

The first and third embodiments can be implemented in combination. That is, in the transmission mechanism of FIG. 5 , the control information is multiplied by the orthogonal code, and then multiplied by the random cyclic shift sequence on the basis of LB, as shown in FIG. 12 or FIG. 13 . Since the random cyclic shift sequence is different for each cell, inter-cell interference can be reduced.

It is clear from the above description that when multiplexing UL control information from different users in the next generation multi-cell mobile communication system, the present invention applies random phase or cyclic shift value to Each block beneficially reduces inter-cell interference.

While the invention has been shown and described with reference to certain preferred embodiments thereof, these are only preferred applications. For example, embodiments of the present invention are applicable to control information having multiple bits, such as CQI, and 1-bit control information. Also, a random value of a code sequence for control information may be applied on a predetermined resource block basis as well as on an LB basis. Accordingly, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

Claims (20)

1. the method for sending control information in single-carrier frequency division multiple access SC-FDMA system, comprises following steps:

For the different time-gap of each self-contained a plurality of SC-FDMA code elements in subframe produces different orthogonal codes;

By the control code element of carrying control information is multiplied each other to produce control channel signal with the sequence that is allocated for the code division multiplexing CDM of described control information; With

The SC-FDMA code element of take multiplies each other the chip of described control channel signal and described orthogonal code as basis, and sends the control channel signal after multiplying each other in described SC-FDMA code element.

2. the combination of the described orthogonal code of the method for claim 1, wherein using in described subframe is different for each community.

3. the combination of the described orthogonal code of the method for claim 1, wherein using in described subframe is different at least one in each community and each user equipment (UE).

4. the method for claim 1, wherein described sequence is Zadoff-Chu (ZC) sequence specific to community.

5. the method for claim 1, wherein described generation control channel signal comprises with the as many sequence of carrying the control code element of described control information and being randomized of quantity of described SC-FDMA code element and multiplies each other.

6. for the method at single-carrier frequency division multiple access SC-FDMA system receiving control information, comprise following steps:

For the different time-gap of each self-contained a plurality of SC-FDMA code elements in subframe produces different orthogonal codes;

The control channel signal receiving and the conjugate sequence of sequence that is allocated for the code division multiplexing CDM of described control information are multiplied each other; With

By take SC-FDMA code element, as basis, the control channel signal after multiplying each other and the chip of described orthogonal code are multiplied each other, obtain described control information.

7. method as claimed in claim 6, wherein, the combination of the described orthogonal code of using in described subframe is different for each community.

8. method as claimed in claim 6, wherein, the combination of the described orthogonal code of using in described subframe is different at least one in each community and each user equipment (UE).

9. method as claimed in claim 6, wherein, described sequence is Zadoff-Chu (ZC) sequence specific to community.

10. method as claimed in claim 6, wherein, described in obtain the control code element and the described conjugate sequence that comprise with the described control channel signal of the as many formation of quantity of described SC-FDMA code element and multiply each other.

11. 1 kinds of devices for sending control information in single-carrier frequency division multiple access SC-FDMA system, comprise:

Control channel signal generator, multiplies each other to produce control channel signal for the control code element that comprises control information by handle and the sequence that is allocated for the code division multiplexing CDM of described control information;

Orthogonal code maker, is used to the different time-gap of each self-contained a plurality of SC-FDMA code elements in subframe to produce different orthogonal codes;

Multiplier, for take SC-FDMA code element as basis the chip of described control channel signal and described orthogonal code is multiplied each other; With

Transmitter, for sending the control channel signal after multiplying each other in described SC-FDMA code element.

12. devices as claimed in claim 11, wherein, the combination of the described orthogonal code of using in described subframe is different for each community.

13. devices as claimed in claim 11, wherein, the combination of the described orthogonal code of using in described subframe is different at least one in each community and each user equipment (UE).

14. devices as claimed in claim 11, wherein, described sequence is Zadoff-Chu (ZC) sequence specific to community.

15. devices as claimed in claim 11, wherein, described control channel signal generator handle multiplies each other with the as many control code element that comprises described control information of quantity of described SC-FDMA code element and the sequence being randomized.

16. 1 kinds for the device at single-carrier frequency division multiple access SC-FDMA system receiving control information, comprises:

Receiver, for receiving the control channel signal that comprises control information; With

Control channel signal receiver, for described control channel signal and the conjugate sequence of sequence that is allocated for the code division multiplexing CDM of described control information are multiplied each other, and take the chip of the different orthogonal code of the different time-gap of each self-contained a plurality of SC-FDMA code elements in the control channel signal of SC-FDMA code element after basis handle multiplies each other and subframe and multiply each other.

17. devices as claimed in claim 16, wherein, the combination of the described orthogonal code of using in described subframe is different for each community.

18. devices as claimed in claim 16, wherein, the combination of the described orthogonal code of using in described subframe is different at least one in each community and each user equipment (UE).

19. devices as claimed in claim 16, wherein, described sequence is Zadoff-Chu (ZC) sequence specific to community.

20. devices as claimed in claim 16, wherein, described control channel signal receiver handle multiplies each other with control code element and the described conjugate sequence of the described control channel signal of the as many formation of quantity of described SC-FDMA code element.