CN101627560B - Method and apparatus for transmitting and receiving control information to randomize inter-cell interference in a mobile communication system - Google Patents
Method and apparatus for transmitting and receiving control information to randomize inter-cell interference in a mobile communication system Download PDFInfo
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Abstract
A method and apparatus for transmitting and receiving control information in an SC-FDMA system are provided. Different orthogonal codes are generated for different slots each including a plurality of SC-FDMA symbols in a subframe. A control channel signal is generated by multiplying control symbols carrying control information by a sequence allocated for CDM of the control information. The control channel signal is multiplied by chips of the orthogonal codes on an SC-FDMA symbol basis and transmitted in the SC-FDMA symbols.
Description
Technical field
Relate generally to mobile communication system of the present invention, the method and apparatus that more particularly relates to the control information of the presence of intercell interference for being caused by up link (UpLink, UL) transmission in the randomization of many community mobile communication systems of next generation sending and receiving.
Background technology
In mobile communication technology field, recent OFDM (Orthogonal FrequencyDivision Multiple Access, OFDMA) or single-carrier frequency division multiple access (SingleCarrier-Frequency Division Multiple Access, SC-FDMA) studied for the high-speed transfer in radio channel.Asynchronous cellular mobile communication standardization body, third generation partner program (3rdGeneration Partnership Project, 3GPP) be just devoted to the Long Term Evolution (Long Term Evolution, LTE) of the next generation mobile communication system relevant with multiple access access scheme.
According to transfer of data, be also non-transfer of data, LTE system for UL control information use different transformat (Transport Format, TP).When sending data and control information on UL, data and control information are re-used by time division multiplexing (time Division Multiplexing, TDM) simultaneously.If only sent control information, to control information, distribute special frequency band.
Fig. 1 is illustrated in the figure of the transmission mechanism when only sending control information on UL in conventional LTE system.Trunnion axis represents the time, and vertical axis represents frequency.Define in time a subframe 102, and in frequency, defined transmission (TX) bandwidth 120.
With reference to figure 1, basic UL time tranfer unit is that subframe 102 length are 1 millisecond, and comprises two time slots 104 and 106, each all long 0.5 millisecond.Each time slot 104 or 106 comprises a plurality of long pieces (Long Block, LB) 108 (or long SC-FDMA code element) and short block (Short Blocks, SB) 110 (or short SC-FDMA code element).In situation shown in Fig. 1, a time slot is configured to have six LB 108 and two SB 110.
Minimum frequency transmission unit is the frequency sound (frequency tone) of LB, and basic resource allocation unit is Resource Unit (Resource Unit, RU).RU 112 and RU 114 all have a plurality of frequency sounds, and here, for example 12 frequency sounds form a RU.The frequency sound disperseing by utilization and discrete frequency sound form RU, also can realize frequency diversity (frequency diversity).
Because LB 108 and SB 110 have identical sample rate (sampling rate), so the frequency sound size that SB 110 has is the twice of the frequency sound size of LB 108.The quantity of distributing to the frequency sound of a RU in SB 110 is in LB 108, to distribute to half of frequency sound quantity of a RU.In the situation shown in Fig. 1, LB 108 carries control information, and SB 108 carries pilot signal (or reference signal (Reference Signal, RS)).Pilot signal is predetermined sequence, and receiver utilizes described sequence to carry out channel estimating, to carry out coherent demodulation.
If only sent control information on UL, in LTE system, this control information sends in predetermined frequency band.In Fig. 1, described frequency band is to be arranged in the RU 112 of both sides of TX bandwidth 120 and at least one of RU 114.
In general, the frequency band that carries control information be take RU and is defined as unit.When requiring a plurality of RU, use continuous RU to meet single-carrier property.In order to increase the frequency diversity for a subframe, there is frequency hopping as basis in the time slot of can take here.
In Fig. 1, the first control information (controlling #1) sends in the first time slot 104 in RU 112, and in RU 114, sends in the second time slot 106 by frequency hopping.Meanwhile, the second control information (controlling #2) sends in the first time slot 104 in RU 114, and in RU 112, sends in the second time slot 106 by frequency hopping.
Control information is for example to indicate successfully or failed down link (DownLink, DL) feedback information of data receiver, be acknowledgement/non-acknowledgement (ACKnowledgment/NagativeACKnowledgment, ACK/NACK), it is generally 1 bit.It repeats in a plurality of LB, to improve receptivity, and Extended Cell coverage.When the user from different sends the control information of 1 bit, can consider code division multiplexing (Code Division Multiplexing, CDM) for multiplexing this 1 bit control information.With frequency division multiplexing (Frequency Division Multiplexing, FDM) compares, the characteristic of CDM is jamproof robustness.
As the multiplexing code sequence of the CDM for control information, Zadoff-Chu (ZC) sequence is discussed.ZC sequence provides good papr (Peak-to-Average Power Ratio, PAPR) characteristic and outstanding channel estimating performance in frequency because of its constant envelope in time and frequency.For UL transmission, PAPR is most important consideration.Higher PAPR causes less cell coverage area, thereby has increased the signal power requirement to subscriber equipment (User Equipment, UE).Therefore, first should be devoted to reduce PAPR in UL transmission.
It is zero circulation autocorrelation value that the ZC sequence with good PAPR characteristic has for non-zero displacement (non-zero shift).Equation below (1) has been described ZC sequence on mathematics.
Wherein, N represents the length of ZC sequence, and p represents the index of ZC sequence, and n represent the sampling of ZC sequence index (n=0 ..., N-1).Because p and N should be relatively prime, so the quantity of sequence index p is along with sequence length N changes.Therefore, for N=6, p=1,5, produce two ZC sequences.If N is prime number, produce N-1 sequence.
Two ZC sequences with different p values that produced by equation (1) have plural cross-correlation, and its absolute value is
, phase place is along with p changes.
By ZC sequence from a user's control information with from other users' control information, distinguish, this will come to describe in more detail by way of example.
In same community, time-domain cyclic shift value (the cyclic shift value) sign from 1 bit control information of different UEs by ZC sequence.Cyclic shift value is specific to UE, the condition that is greater than the maximum traffic delay of radio transmission path to meet it, thus guarantee mutually orthogonal between UE.Therefore the quantity that, accesses open ended UE for multiple access depends on length and the cyclic shift value of ZC sequence.For example, if ZC sequence length is 12 samplings, and guarantee that the minimal circulation shift value of the orthogonality between ZC sequence is 2 samplings, six UE (=12/2) can obtain multiple access access.
Fig. 2 shows control information from UE by the multiplexing transmission mechanism of CDM.
With reference to figure 2, in community 202 (community A), the first and second UE 204 and 206 (UE#1 and UE#2) are used identical ZC sequence in LB, i.e. ZC#1, and for user's identification is respectively by ZC#1 cyclic shift 0208 and Δ 210.In the situation shown in Fig. 2, for Extended Cell coverage, UE#1 and UE#2 all expect that by handle the modulated symbol of 1 bit UL control information of (intended) repeats six times, in six LB, repeat this modulated symbol, and the ZC sequence of the code element repeating and process cyclic shift, be that ZC#1 multiplies each other to produce control channel signal in each LB.Due to the circulation autocorrelation performance of ZC sequence, these control channel signals keep quadrature and do not disturb between UE#1 and UE#2.Δ 210 is set to larger than the maximum traffic delay of radio transmission path.Two SB in each time slot carry the pilot tone for the coherent demodulation of control information.For illustrative purposes, in Fig. 2, only show a time slot of control information.
In community 220 (community B), it is ZC#2 that the third and fourth UE 222 and 224 (UE#3 and UE#4) is used identical ZC sequence in LB, and for user's identification is respectively by ZC#2 cyclic shift 0226 and Δ 228.Due to the circulation autocorrelation performance of ZC sequence, from the control channel signal of UE#3 and UE#4, between them, keep quadrature and do not disturb.
But when the control channel signal of the UE from different districts is used different ZC sequences, this control information transmission plan causes the interference between these communities.In Fig. 2, the UE#1 of community A and UE#2 are used the ZC sequence of the UE#3 and the UE#4 that are different from community B.The their cross correlation of ZC sequence cause between UE to ZC sequence between the proportional interference of cross-correlation.Therefore a kind of method that, needs presence of intercell interference for reducing being caused by control information transmission as above.
Summary of the invention
Made the present invention at least solve problem and/or shortcoming above, and the advantage the following describes is at least provided.Therefore, one aspect of the present invention provides a kind of for reduce the method and apparatus of presence of intercell interference when in the multiplexing control information from different user of many cell environments.
It is a kind of for by specific to method and apparatus community or put on the further randomize inter-cell interference of control information of subframe specific to the random sequence of UE that another aspect of the present invention provides.
Another aspect of the present invention provides a kind of method and apparatus of the random sequence of the control information in subframe that puts on to UE notice by ground floor/second layer (L1/L2) signaling.
Another aspect of the present invention provide a kind of for effectively receive subframe control information and without the method and apparatus of presence of intercell interference.
According to an aspect of the present invention, provide a kind of method for sending control information in SC-FDMA system.For the different time-gap of each self-contained a plurality of SC-FDMA code elements in subframe produces different orthogonal codes.The control code element of carrying control information by handle multiplies each other to produce control channel signal with the sequence that is allocated for described control information CDM.Described control channel signal be take SC-FDMA code element and is that basis and the chip of described orthogonal code multiply each other, and sends in described SC-FDMA code element.
According to a further aspect of the invention, provide a kind of for the method at SC-FDMA system receiving control information.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 CDM of described control information are multiplied each other.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.
According to a further aspect of the invention, provide a kind of device for sending control information in SC-FDMA system.Control channel signal generator is by multiplying each other to produce control channel signal by the control code element that comprises control information and the sequence that is allocated for the CDM of described control information.Transmitter is that the different time-gap of each self-contained a plurality of SC-FDMA code elements in subframe produces different orthogonal codes, the SC-FDMA code element of take multiplies each other the chip of described control channel signal and described orthogonal code as basis, and the control channel signal after multiplying each other described in sending in described SC-FDMA code element.
According to a further aspect of the invention, provide a kind of for the device at SC-FDMA system receiving control information.Receiver receives the control channel signal that comprises control information.Control channel signal receiver multiplies each other described control channel signal and the conjugate sequence of sequence that is allocated for the CDM of described control information, and the control channel signal after multiplying each other with for the chip of the different orthogonal code of the different time-gap of each self-contained a plurality of SC-FDMA code elements of subframe, multiply each other as basis by take SC-FDMA code element, obtain described control information.
Accompanying drawing explanation
When by reference to the accompanying drawings, according to detailed description below, the above and other aspects, features and advantages of some one exemplary embodiment of the present invention will be more clear, wherein:
Fig. 1 is the figure illustrating in conventional LTE system for the transmission mechanism of control information;
Fig. 2 shows control information from UE by the multiplexing transmission mechanism of CDM;
Fig. 3 is the flow chart that the operation for sending control information at UE is shown according to an embodiment of the invention;
Fig. 4 is the flow chart illustrating according to an embodiment of the invention for the operation at Node B receiving control information;
Fig. 5 is the figure that the transmission mechanism of control information is according to an embodiment of the invention shown;
Fig. 6 A and Fig. 6 B are the block diagrams that the transmitter in UE is according to an embodiment of the invention shown;
Fig. 7 A and Fig. 7 B are the block diagrams that the receiver in Node B is according to an embodiment of the invention shown;
Fig. 8 is the figure illustrating according to an embodiment of the invention for the transmission mechanism of control information;
Fig. 9 is the figure illustrating according to an embodiment of the invention for another transmission mechanism of control information;
Figure 10 A and Figure 10 B are the block diagrams that the transmitter in MS is according to an embodiment of the invention shown;
Figure 11 A and Figure 11 B are the block diagrams that the receiver in Node B is according to an embodiment of the invention shown;
Figure 12 A and Figure 12 B are the figure illustrating according to an embodiment of the invention for the transmission mechanism of control information; With
Figure 13 is the figure illustrating according to an embodiment of the invention for another transmission mechanism of control information.
Embodiment
With reference to accompanying drawing the preferred embodiment of the present invention will be described in detail.Although should be noted that similar parts are by shown in different accompanying drawings, they are indicated with similar reference number.May omit the detailed description of known technically structure or process to avoid making the present invention's fuzzy that seems.
Embodiments of the invention provide in the UL control information from a plurality of UE by the situation that the predetermined frequency range of band system band (frequency area) is upper multiplexing, the sending and receiving operation of UE and Node B.
To the control information from a plurality of UE be carried out describing embodiments of the invention under the situation of CDM transmission in SC-FDMA cellular communication system.Embodiments of the invention are also applicable to not share the multiplexing of specific time-frequency resource, for example the FDM of control information or TDM transmission.CDM can be comprise time domain CDMA and frequency domain CDM various CDMA schemes one of them.
For CDM, used ZC sequence, although any other code sequence with similar characteristics is also available.Control information is 1 bit control information, for example the ACK/NACK here.But presence of intercell interference minishing method of the present invention is also applicable to have the control information of a plurality of bits, CQI (Channel Quality Indicator, CQI) for example.In this case, each bit of control information is sent in a SC-FDMA code element.Described presence of intercell interference minishing method is also applicable to the CDM transmission of dissimilar control information, for example 1 bit control information and have the control information of a plurality of bits of dissimilar control information.
UE in neighbor cell is different ZC sequences that to use length in the LB of M as UL time tranfer unit be N while sending their control information M SC-FDMA code element, and presence of intercell interference occurs.
If be randomized from the relevant phase place between the sequence in the LB of the UE in neighbor cell, the circulation auto-correlation and the their cross correlation that keep ZC sequence simultaneously, the phase place of disturbing between neighbor cell, receiver place at the accumulation period of LB of control information that carries subframe by across LB randomization, thereby reduced average interference power.
According to embodiments of the invention, the LB that each UE be take in subframe produces its ZC sequence as basis, and the random sequence with random phase or random rotation shift value is put on to the ZC sequence in each LB, thus this ZC sequence of randomization.Then, UE utilizes the ZC sequence being randomized to send control information.Random sequence is specific to community.For each UE, use the different random sequence of phase value or cyclic shift value further to improve interference randomization.
Embodiments of the invention have proposed three kinds of methods.In the following description, the ZC sequence that length is N is by g
p(n) represent.ZC sequence g
p(n) by randomization on M LB, and control information and randomization (randomized) ZC sequence g '
p, m, k(n) multiply each other, wherein, k represents to carry the index of the channel of control information.
Equation (2) has been described the randomization 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
krepresent the cyclic shift value of identical ZC sequence, pass through d
ksign is carried the channel k of control information.Cyclic shift value is time-domain cyclic shift value preferably, although it can be frequency domain cyclic shift value.In equation (2), mod represents modular arithmetic.For example, A mod B represents that A is divided by the remainder of B.
S
m, mrepresent the orthogonal code that length is M, be+1s or-1s.This orthogonal code can be walsh code.M represents the index of the LB that control information is mapped to.If control information is repeated four times in the time slot of subframe, the chip of the walsh sequence that is 4 by length and the LB of each time slot multiply each other one by one, and the combination of the walsh sequence of two time slots in subframe is different for each community, therefore presence of intercell interference randomization.For other randomization, the various combination of walsh sequence can be used to each UE.
Equation (3) has been described the randomization ZC sequence according to method 2.
(m＝1，2，...，M，n＝0，1，2...，N-1).....(3)
Wherein, φ
mbe illustrated in and in each LB, change ZC sequence g
p(n) the random phase value of phase place.By use the set of different random phase values, i.e. different random phasic serial signal { φ for neighbor cell in the LB of subframe
m, presence of intercell interference is randomized.
Equation (4) has been described the randomization 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
mbe illustrated in and in each LB, change ZC sequence g
p(n) time-domain cyclic shift value d
krandom rotation shift value.By use the set of different random time-domain cyclic shift values for neighbor cell in the LB of subframe, i.e. different random time-domain cyclic shift sequence { Δ
m, presence of intercell interference is randomized.Although random rotation shift value is used in time domain here, they can be adapted to be and be used in frequency domain.
Fig. 3 illustrates the flow chart that uses according to an embodiment of the invention the operation that randomization ZC sequence sends control information.
With reference to figure 3, UE in step 302 by signaling from Node B receiving sequence information and random sequence information.Sequence information is about the ZC sequence for using when sending control information, and comprises index and the cyclic shift value of ZC sequence.Random sequence information is used to ZC sequence to carry out randomization, comprises the random time-domain cyclic shift sequence as random phasic serial signal or the random time-domain cyclic shift value set of conduct of random phase value set, for the LB that is applied to subframe.Described signaling is upper strata (for example L2) signaling or physical layer (L1) signaling.For randomize inter-cell interference, random phasic serial signal or random time-domain cyclic shift sequence are different for each community.For further interference randomization, it is different that random phasic serial signal or random time-domain cyclic shift sequence also can be set to for each UE.
In step 304, UE produces control information, and uses this control information to produce complex-value modulation symbols (be after this called and control code element).The quantity that controls code element equals to be allocated for the quantity of the LB of control information transmission.For example, if control information is 1 bit, UE is by repeating the as many control code element of quantity of generation and the LB distributing.
In step 306, UE is used index and the cyclic shift value that sequence information comprises to produce ZC sequence.Then, in step 308, the random phasic serial signal that UE comprises according to random sequence information or random time-domain cyclic shift sequence generation random value.Random value is walsh sequence, random phase value or random time-domain cyclic shift value.These random values are different for each community and/or each UE.In step 310, UE applies random value to ZC sequence and produces randomization ZC sequence as basis by take LB.In step 312, UE multiplies each other randomization ZC sequence and control code element, and product is mapped to LB, the LB of concurrent warp let-off mapping.
Fig. 4 is the flow chart illustrating according to an embodiment of the invention for the operation at Node B receiving control information.
With reference to figure 4, in step 402, Node B by obtaining coherent signal the signal receiving from expection UE and the ZC Serial relation that puts on this signal in a plurality of LB.In step 404, Node B is carried out channel estimating to the pilot signal receiving from UE, and utilizes channel estimating to carry out channel compensation to described coherent signal.In step 406, Node B, by take LB as basic the random value corresponding to UE puts on the coherent signal through channel compensation, is obtained control information thereby remove random value from the coherent signal through channel compensation.Corresponding to the random value of UE, be that the random sequence information that sends to UE from Node B is learnt.
In the sending and receiving of superincumbent control information, LB (being SC-FDMA code element) is base unit, and control information is mapped to this base unit, to transmit.YiLBWei unit repeats ZC sequence, and the element of random phasic serial signal or random time-domain cyclic shift sequence by LB change.
In a plurality of communities, be present in the situation under same Node B, the UE in each community is used identical ZC sequence and multiplexing their control channel of different time-domain cyclic shift value.If the LB of take is used different random phasic serial signals or random time-domain cyclic shift sequence as basis, between UE, may lose orthogonality in the community of Node B.Therefore,, under this environment, random phasic serial signal or random time-domain cyclic shift sequence are specific to Node B, and identical random sequence is used in the community of Node B.
The first embodiment of the present invention has been implemented the method 1 of describing in equation (2).
Fig. 5 shows according to the transmission mechanism of the control information of the first embodiment of the present invention.
With reference to figure 5, in a subframe, identical 1 bit control information occurs 8 times, and take time slot and stand frequency hopping as basis, to realize frequency diversity.If in each time slot, two SB and first and last LB carry the pilot tone for channel estimating, the remaining LB of this time slot can be used to send control information.Although a RU is used to send control information, can support a plurality of users with a plurality of RU here.
In the first time slot, the modulated symbol that carries 1 bit control information occurs 4 times, for transmitting in four LB, and take LB and as basis, is multiplied by orthogonal code the S1502 (=S1 that length is 4
4,1s1
4,2s1
4,3s1
4,4).S1
4, xrepresent the chip x of orthogonal code S1.Pilot frequency sequence also take LB or SB as basis, be multiplied by the orthogonal code S1 ' 504 that length is 4 (=S1 '
4,1s1 '
4,2s1 '
4,3s1 '
4,4).Use orthogonal code can increase multiple access access (multiple-access) user's quantity.For example, for length 4, there are four orthogonal codes to use.Using four orthogonal codes can make the number of users holding in identical running time-frequency resource is four times while not using orthogonal code.
In the second time slot, 1 bit control information occurs four times, and take LB and as basis, be multiplied by orthogonal code the S2 506 (=S2 that length is 4
4,1s2
4,2s2
4,3s2
4,4).Pilot frequency sequence also take LB or SB as basis, be multiplied by the orthogonal code S2 ' 508 that length is 4 (=S2 '
4,1s2 '
4,2s2 '
4,3s2 '
4,4).
Node B is to UE signaling orthogonal code S1502, S1 ' 504, S2506 and S2 ' 508.Due to the character of orthogonal code, its length should be 4 multiple.In Fig. 5, the orthogonal code that length is 4 is applied in each time slot.If in the transmission mechanism of Fig. 5, frequency hopping not take time slot and is occurred as basis, can think that control information experienced in frequency little of insignificant channel variation between a subframe transmission period.Therefore,, even if the length of orthogonal code is extended to a subframe, also still keep orthogonality.In this case, the orthogonal code that length is 8 can be used to send control information in a subframe.
The various combination of the orthogonal code of the time slot that will put on a subframe is set, so that randomize inter-cell interference for each community.For example, in order to send control information in time slot, community A is sequentially used orthogonal code { S1, S2}, and community B is sequentially used orthogonal code { S3, S4}.{ S3, S4} comprises that at least one is different from orthogonal code combination { S1, the orthogonal code of S2} in orthogonal code combination.
Fig. 6 A and Fig. 6 B are the block diagrams illustrating according to the transmitter in the UE of one exemplary embodiment of the present invention.
With reference to figure 6A, transmitter comprises controller 610, pilot tone maker 612, control channel signal generator 614, Data Generator 616, multiplexer (Multiplexer, MUX) 617, (the Serial-to-Parallel of string-also, S/P) transducer 618, fast fourier transform (FFT) processor 619, mapper 620, inverse fast Fourier transformer (IFFT) 622, also-string (Parallel-to-Serial, P/S) transducer 624, orthogonal code maker 626, multiplier 628, Cyclic Prefix (Cyclic Prefix, CP) adder (adder) 630 and antenna 632.Here will parts and the operation relevant with UL transfer of data not described.
The operation of 610 pairs of transmitters of controller provides overall control, and produces MUX 617, fft processor 619, mapper 620, pilot tone maker 612, control channel signal generator 614, Data Generator 616 and the required control signal of orthogonal code maker 626.The control signal indication that offers pilot tone maker 612 will be for generation of sequence index and the time-domain cyclic shift value of pilot frequency sequence.The control signal being associated with UL control information and transfer of data is provided for control channel signal generator 614 and Data Generator 616.
MUX 617 bases are by the multiplexing pilot signal receiving from pilot tone maker 612, Data Generator 616 and control channel signal generator 614 of the indicated timing information of the control signal receiving from controller 610, data-signal and control channel signal, to transmit in LB or SB.Mapper 620 according to the LB/SB timing information receiving from controller 610 and frequency assignment information multiplexing signal map to frequency resource.
When only sending control information countless according to time, orthogonal code maker 626 produces orthogonal code for LB/SB about what will be used to time slot specific to community or specific to the information of the orthogonal code of UE according to what receive from controller 610, and according to the timing information receiving from controller 610, the chip of orthogonal code is put on to the control code element of the control channel signal that is mapped to LB.Orthogonal code information offers controller 610 by Node B signaling.
S/P transducer 618 is converted to parallel signal the multiplexed signals from MUX 617, and provides it to fft processor 619.The I/O size of fft processor 619 changes according to the control signal receiving from controller 610.620 FFT signal map from fft processor 619 of mapper are to frequency resource.IFFT processor 622 is converted to time signal mapped frequency signal, and time signal described in 624 serializations of P/S transducer.Multiplier 628 is multiplied by serial time signal the orthogonal code producing from orthogonal code maker 626.That is, orthogonal code maker 626 produces and will be applied in and will carry the orthogonal code of time slot of the subframe of control information according to the timing information receiving from controller 610.
CP adder 630 is added to CP the signal receiving from multiplier 628, to avoid inter symbol interference, and launches by transmitting antenna 632 signal that has added CP.
Fig. 6 B illustrates the detailed diagram of control channel signal generator 614 according to an embodiment of the invention.
With reference to figure 6B, the sequence generator 642 of control channel signal generator 614 for example be take LB, as basis generation code sequence, a ZC sequence.In order so to do, sequence generator 642 for example, from controller 610 receiving sequence information, sequence length and sequence index.Node B and UE be known array information.
Control information maker 640 produces the modulated symbol with 1 bit control information, and duplicator 643 repeats this control code element to produce and to distribute to the as many control code element of quantity of the LB of control information.Multiplier 646 is multiplied by this controls code element as basis ZC sequence to carry out CDM multiplexing to controlling code element by take LB, thus generation control channel signal.
The effect of multiplier 646 is to produce the multiplexing control channel signal of user by the code element from duplicator 643 outputs is multiplied by ZC sequence.By replacing multiplier 646 with equivalent of the apparatus, it is contemplated that modified embodiment of the present invention.
Fig. 7 A and Fig. 7 B are the block diagrams that the receiver in Node B is according to an embodiment of the invention shown.
With reference to figure 7A, receiver comprises antenna 710, CP remover 712, S/P transducer 714, fft processor 716, de-mapping device 718, IFFT processor 720, P/S transducer 722, demodulation multiplexer (DEMUX) 724, controller 726, control channel signal receiver 728, channel estimator 730 and data demodulator and decoder 732.Here will parts and the operation being associated with UL data receiver do not described.
The operation of 726 pairs of receivers of controller provides overall control, and produces DEMUX 724, IFFT processor 720, de-mapping device 718, control channel signal receiver 728, channel estimator 730 and data demodulator and the required control signal of decoder 732.The control signal relevant with data with UL control information is provided for control channel signal receiver 728 and data demodulator and decoder 732.The control channel signal of indicator sequence index and time-domain cyclic shift value is provided for channel estimator 730.Sequence index and time-domain cyclic shift value are used to generate the pilot frequency sequence of distributing to UE.
DEMUX 724 is control channel signal, data-signal and pilot signal according to the timing information receiving from controller 726 the signal demultiplexing receiving from P/S transducer 722.De-mapping device 718, according to the LB/SB timing information and the frequency assignment information that receive from controller 726, extracts those signals from frequency resource.
When receiving from UE the signal that comprises control information by antenna 710, CP remover 712 is removed CP from the signal receiving.S/P transducer 714 is converted to parallel signal the signal without CP, and fft processor 716 is processed described parallel signal by FFT.In de-mapping device 718, after demapping, FFT signal is converted into time signal in IFFT processor 720.The I/O size of IFFT processor 720 changes according to the control signal receiving from controller 726.IFFT signal described in 722 serializations of P/S transducer, and DEMUX 724 is control channel signal, pilot signal and data-signal serial signal demultiplexing.
Channel estimator 730 obtains channel estimating by the pilot signal receiving from DEMUX 724.Control channel signal receiver 728 utilizes this channel estimating to carry out channel compensation to the control channel signal receiving from DEMUX 724, and obtains the control information that UE sends.Data demodulator and decoder 732 utilize this channel estimating to carry out channel compensation to the data-signal receiving from DEMUX 724, then based on control information, obtain the data that UE sends.
When only sending control information on UL countless according to time, control channel signal receiver 728 obtains control information in the mode of describing with reference to figure 5.
Fig. 7 B illustrates the detailed diagram of control channel signal receiver 728 according to an embodiment of the invention.
With reference to figure 7B, control channel signal receiver 728 comprises correlator 740 and removes randomizer 742.The sequence generator 744 of correlator 740 produces code sequences, and ZC sequence for example, for producing 1 bit control information for UE.In order so to do, sequence generator 744 receives the sequence information of indicator sequence length and sequence index from controller 726.Node B and UE be known array information.
Conjugator 746 calculates the conjugation result (consequence) of ZC sequence.Multiplier 748 carries out CDM demultiplexing by take the control channel signal that LB comes handle to receive from DEMUX 724 with this conjugate sequence control channel signal times as basis.Accumulator 750 accumulates for the length of ZC sequence the signal receiving from multiplier 748.Channel compensator 752 utilizes the channel estimating receiving from channel estimator 730 to carry out channel compensation to accumulating signal.
In removing randomizer 742, orthogonal code maker 754 produces orthogonal code according to orthogonal code information, and UE is used described orthogonal code to send 1 bit control information.Multiplier 758 be take LB as the chip of basic the signal times through channel compensation with orthogonal sequence.The signal that the quantity accumulation of the LB that accumulator 760 is repeated to be mapped to for 1 bit information receives from multiplier 758, thus 1 bit control information obtained.Orthogonal code information is by from Node B signaling to UE, so that Node B and UE know this orthogonal code information.
In the embodiment of modification of the present invention, channel compensator 752 is placed between multiplier 758 and accumulator 760.Although quadrature device 740 and go randomizer 742 to be configured dividually in Fig. 7 B, depends on collocation method, the sequence generator 744 of correlator 740 with go the orthogonal code maker 754 of randomizer 742 to be incorporated in individual equipment.For example, if correlator 740 is configured to make sequence generator 744 to generate to have for each UE, take the ZC sequence of the orthogonal code that LB applies as basis, go the multiplier 758 of randomizer 742 and orthogonal code maker 754 not to be used.Therefore, realized and be equal to the equipment shown in Fig. 7 B.
The second embodiment of the present invention has been implemented the method 2 of describing in equation (3).
Fig. 8 is the figure that the transmission mechanism of control information is according to an embodiment of the invention shown.
With reference to 8, one time slots of figure, comprise 7 LB altogether, and the 4th LB carries pilot signal in each time slot.Therefore, a subframe has 14 LB altogether, and 2 LB are used to pilot transmission, and 12 LB are for control information transmission.Although a RU is used to send control information, can support a plurality of users with a plurality of RU here.
1 identical bit control information occurs 6 times, thereby occurs 12 times in a subframe in each time slot.For frequency diversity, the time slot of take is carried out frequency hopping as basis to control information.At each, carry in the LB of control information, random phase is applied in ZC sequence.The randomization of consequent ZC sequence makes presence of intercell interference randomization.
The random phase value that puts on ZC sequence in LB is φ
1, φ
2... φ
12802 to 824.ZC sequence is multiplied by
(m=1,2 ... 12), thereby by phase rotating.Because for the random phasic serial signal as random phase value set of LB specific to community, so presence of intercell interference is randomized.That is, due to being correlated with in a subframe by phase rotating randomly, so be lowered from the interference between the control channel of these communities between the randomization ZC sequence of the LB for different districts.
Node B is to UE signaling random phasic serial signal, so that Node B and UE know this random phasic serial signal.In order to reduce presence of intercell interference, specific to the random phase value of community, also can be applied in pilot signal.Node B is to random phase value described in UE signaling, so that Node B and UE know this random phasic serial signal.
Fig. 9 is the figure that another transmission mechanism of control information is according to an embodiment of the invention shown.
With reference to 9, one time slots of figure, comprise 6 LB and 2 SB that carry pilot signal altogether.Therefore, a subframe has 12 LB altogether, and 4 SB are used to pilot transmission, and 12 LB are for control information transmission.1 identical bit control information occurs 6 times, thereby occurs 12 times in a subframe in each time slot.For frequency diversity, the time slot of take is carried out frequency hopping as basis to control information.The random phase value that puts on ZC sequence in LB is φ
1, φ
2... φ
12902 to 924.
Figure 10 A and Figure 10 B are the block diagrams that the transmitter in UE is according to an embodiment of the invention shown.
With reference to figure 10A, described transmitter comprises controller 1010, pilot tone maker 1012, control channel signal generator 1014, Data Generator 1016, MUX 1017, S/P transducer 1018, fft processor 1019, mapper 1020, IFFT 1022, P/S transducer 1024, CP adder 1030 and antenna 1032.Here will parts and the operation relevant with UL transfer of data not described.
The operation of 1010 pairs of transmitters of controller provides overall control, and produces MUX 1017, fft processor 1019, mapper 1020, pilot tone maker 1012, control channel signal generator 1014 and the required control signal of Data Generator 1016.Offer the control signal indication of pilot tone maker 1012 for sequence index and the time-domain cyclic shift value of pilot tone generation, the pilot signal sequence that this sequence index indication is assigned with.The control signal being associated with UL control information and transfer of data is provided for control channel signal generator 1014 and Data Generator 1016.
MUX 1017 is according to the indicated multiplexing pilot signal receiving from pilot tone maker 1012, Data Generator 1016 and control channel signal generator 1014 of timing information, data-signal and the control channel signal of control signal receiving from controller 1010, to transmit in LB or SB.Mapper 1020 is mapped to frequency resource according to the LB/SB timing information and the frequency assignment information that receive from controller 1010 multiplexing information.
When only sending control information countless according to time, in preceding method, control channel signal generator 1014 is by producing control channel signal take LB as basic randomized ZC sequence puts on control information.
S/P transducer 1018 is converted to parallel signal the multiplexed signals from MUX 1017, and provides it to fft processor 1019.The I/O size of fft processor 1019 changes according to the control signal receiving from controller 1010.1020 FFT signal map from fft processor 1019 of mapper are to frequency resource.IFFT processor 1022 is converted to time signal mapped frequency signal, and time signal described in 1024 serializations of P/S transducer.CP adder 1030 is added to described serial signal CP, and by transmitting antenna 1032 transmittings, has added the signal of CP.
Figure 10 B illustrates the detailed diagram of control channel signal generator 1014 according to an embodiment of the invention.
With reference to figure 10B, the sequence generator 1042 of control channel signal generator 1014 produces the code sequence that will be used to LB, for example ZC sequence.Randomizer 1044 is each LB generation random phase value, and in each LB, described random phase value and ZC sequence is multiplied each other.In order so to do, sequence generator 1042 is from controller 1010 receiving sequence information, for example sequence length and sequence index, and the random sequence information that receives about the random phase value for each LB from controller 1010 of randomizer 1044.Then, randomizer 1044 utilizes the phase place of random phase value rotation ZC sequence in each LB, thereby by the phase randomization of ZC sequence.Node B and UE be known array information and random sequence information.
Control information maker 1040 produces the modulated symbol with 1 bit control information, and duplicator (repeater) 1043 repeats this control code element to produce and the as many control code element of quantity of distributing to the LB of control information.Multiplier 1046 multiplies each other as basis the ZC sequence of controlling code element and be randomized by take LB that to carry out CDM multiplexing to controlling code element, thereby produces control channel signal.
The effect of multiplier 1046 is to take code element as the basic code element of exporting from duplicator 1043 by the randomization of randomization ZC sequence.By use, carry out to be equal to that randomization ZC sequence is put on and controls code element or the equipment of the function of randomization ZC sequence and control grouping of bits is replaced to multiplier 1046, it is contemplated that modified embodiment of the present invention.For example, multiplier 1046 can replace with phase rotation device, and described phase rotation device is according to the phase value φ of randomization ZC sequence
mor Δ
mchange the phase place of controlling code element.
Figure 11 A and Figure 11 B are the block diagrams that the receiver in Node B is according to an embodiment of the invention shown.
With reference to figure 11A, receiver comprises antenna 1110, CP remover 1112, S/P transducer 1114, fft processor 1116, de-mapping device 1118, IFFT processor 1120, P/S transducer 1122, DEMUX1124, controller 1126, control channel signal receiver 1128, channel estimator 1130 and data demodulator and decoder 1132.Here will parts and the operation being associated with UL data receiver do not described.
The operation of 1126 pairs of receivers of controller provides overall control.It also produces DEMUX 1124, IFFT processor 1120, de-mapping device 1118, control channel signal receiver 1128, channel estimator 1130 and data demodulator and the required control signal of decoder 1132.The control signal relevant with data with UL control information is provided for control channel signal receiver 1128 and data demodulator and decoder 1132.The control signal of indicator sequence index and time-domain cyclic shift value is provided for channel estimator 1130, and the pilot frequency sequence of UE is distributed in sequence index indication.Sequence index and time-domain cyclic shift value are used to pilot reception.
DEMUX 1124 is control channel signal, data-signal and pilot signal according to the timing information receiving from controller 1126 the signal demultiplexing receiving from P/S transducer 1122.De-mapping device 1118, according to the LB/SB timing information and the frequency assignment information that receive from controller 1126, extracts those signals from frequency resource.
When receiving from UE the signal that comprises control information by antenna 1110, CP remover 1112 is removed CP from the signal receiving.S/P transducer 1114 is converted to parallel signal the signal without CP, and fft processor 1116 is processed described parallel signal by FFT.After processing in de-mapping device 1118, FFT signal is converted into time signal in IFFT processor 1120.IFFT signal described in 1122 serializations of P/S transducer, and DEMUX 1124 is control channel signal, pilot signal and data-signal serial signal demultiplexing.
Channel estimator 1130 obtains channel estimating by the pilot signal receiving from DEMUX 1124.Control channel signal receiver 1128 utilizes channel estimating to carry out channel compensation to the control channel signal receiving from DEMUX 1124, and obtains the control information that UE sends.Data demodulator and decoder 1132 utilize channel estimating to carry out channel compensation to the data-signal receiving from DEMUX 1124, then based on control information, obtain the data that UE sends.
When only sending control information on UL countless according to time, control channel signal receiver 1128 obtains control information in the mode of describing with reference to figure 8 and Fig. 9.
Figure 11 B illustrates the detailed diagram of control channel signal receiver 1128 according to an embodiment of the invention.
With reference to figure 11B, control channel signal receiver 1128 comprises correlator 1140 and removes randomizer 1142.The sequence generator 1144 of correlator 1140 produces code sequences, and ZC sequence for example, for producing control information for UE.In order so to do, sequence generator 1144 receives the sequence information of indicator sequence length and sequence index from controller 1126.Node B and UE be known array information.
Conjugator 1146 calculates the conjugation result (consequence) of ZC sequence.Multiplier 1148 multiplies each other control channel signal and conjugate sequence the control channel signal receiving from DEMUX 1124 is carried out to CDM demultiplexing as basis by take LB.Accumulator 1150 is for the length accumulation product signal of ZC sequence.The multiplier 1148 of correlator 1140 can be replaced by phase rotation device, and described phase rotation device is according to the phase value d of the sequence receiving from sequence generator 1144
kthe LB of take changes the phase place of control channel signal as basis.Channel compensator 1152 utilizes the channel estimating receiving from channel estimator 1130 to carry out channel compensation to accumulating signal.
In removing randomizer 1142, random value maker 1156 calculates the conjugate phase value of the random phase value of using when UE sends control information according to random sequence information.Multiplier 1158 be take LB and is that basis multiplies each other signal and described conjugate phase value through channel compensation.As the multiplier 1046 of transmitter, go the multiplier 1158 of randomizer 1142 to be replaced by phase rotation device, described phase rotation device is according to the phase value φ of the random sequence receiving from sequence generator 1156
mor Δ
mthe LB of take changes the phase place of control channel signal as basis.
The signal that the quantity accumulation of the LB that accumulator 1160 is repeatedly mapped to for 1 bit information receives from multiplier 1158, thus 1 bit control information obtained.Random sequence information is by from Node B signaling to UE, so that Node B and UE know random sequence information.
In the embodiment of modification of the present invention, channel compensator 1152 is placed between multiplier 1158 and accumulator 1160.Although correlator 1140 and go randomizer 1142 to be configured dividually in Figure 11 B, depends on collocation method, the sequence generator 1144 of correlator 1140 with go the random value maker 1156 of randomizer 1142 to be incorporated in individual equipment.For example, if correlator 1140 is configured to make sequence generator 1144 for each UE generates the ZC sequence that has been applied in random sequence, go the multiplier 1158 of randomizer 1142 and random value maker 1156 not to be used.Therefore, realized and be equal to the equipment shown in Figure 11 B.In this case, the multiplier in transmitter, the multiplier 1148 of correlator 1140 can be replaced by phase rotation device, and described phase rotation device is according to the phase value (d of the sequence receiving from sequence generator 1144
k+ φ
m) or (d
k+ Δ
m) take code element as the basic phase place that changes control channel signal.
By to each UE for each LB arranges different phase values, can further improve presence of intercell interference randomization.Node B is to the phase value of each each LB of UE signaling.
Except as imposing on the random sequence of phase sequence of 12 LB that carry 1 bit control information, in the second one exemplary embodiment of the present invention, also can use the quadrature phase sequence such as Fourier series.Length is that the Fourier series of N is defined as:
In equation (5), for each community arranges the different value k specific to community.When use different Fourier series to take LB during as the rotation of basic excute phase for each community, if be regularly synchronous in minizone, there is not interference in minizone.
The first and second one exemplary embodiment of the present invention can combine enforcement.In the transmission mechanism of Fig. 5, LB and the orthogonal code of carrying 1 bit control information multiply each other, and then multiply each other with random phasic serial signal.Because random phasic serial signal is specific to community, so can reduce presence of intercell interference.
The third embodiment of the present invention is implemented the method 3 of describing in equation (4).
The time-domain cyclic shift value of ZC sequence is specific to community, and changes in each carries the LB of control information, thereby makes presence of intercell interference randomization.In particular, except putting on each cyclic shift value d of the multiplexing control channel of CDM in the inherent identical frequency resource in community
kin addition, in time domain, also apply the cyclic shift value Δ specific to community that is applied in each LB
m.Node B should be specific to the cyclic shift value of community to UE signaling.The described cyclic shift value specific to community is set to larger than the maximum delay of radio transmission path, to keep the orthogonality of ZC sequence.
In order to reduce presence of intercell interference, also the random time-domain cyclic shift value specific to community can be put on to pilot signal.Node B is to random time-domain cyclic shift value described in UE signaling, so that Node B and UE know this random time-domain cyclic shift sequence.
Figure 12 A is the figure that the transmission mechanism of control information is according to an embodiment of the invention shown.
With reference to figure 12A, a time slot comprises 7 LB altogether, and the 4th LB carries pilot signal in each time slot.Therefore, a subframe has 14 LB altogether, and 2 LB are used to pilot transmission, and 12 LB are for control information transmission.Although a RU is used to send control information, can support a plurality of users with a plurality of RU here.
The random time-domain cyclic shift value that puts on 12 LB of ZC sequence is Δ
1, Δ
2... Δ
121202 to 1224.ZC sequence be take LB by random time-domain cyclic shift value 1202 to 1224 and is recycled displacement as basis, so that randomization control information.
Figure 12 B is the detailed view of Figure 12 A.For different control channel in the multiplexing community of CDM, identical time-domain cyclic shift value d
k(k is control channel index) is applied to each LB, and for randomization is from the interference between the control information of neighbor cell, specific to the different time-domain cyclic shift value 1202 of community, to 1224, is applied to LB.That is, ZC sequence is used to the other cyclic shift of time-domain cyclic shift value of each UE in community.Reference number 1230 and 1232 represents respectively the first and second time slots in a subframe.For convenience's sake, not shown frequency hopping.
When for other randomization, use specific to UE time-domain cyclic shift time, 1202 to 1204 indications of time-domain cyclic shift value are specific to the random sequence of UE, and d
kand being combined between the control channel in same community of time-domain cyclic shift value 1202 to 1224 keeps orthogonality.
Figure 13 is the figure that another transmission mechanism of control information is according to an embodiment of the invention shown.The time-domain cyclic shift value of the ZC sequence of 12 LB is Δ
1, Δ
2... Δ
121302 to 1324.In each LB, utilize time-domain cyclic shift value by ZC sequence cyclic shift, so that randomization control information.
Except utilizing random time-domain cyclic shift, the randomizer 1044 shown in Figure 10 B take LB as basic randomization ZC sequence, and the conjugate phase value of the random time-domain cyclic shift value of 1156 each LB of calculating of the random value maker shown in Figure 11 B also provides it to outside multiplier 1158, identical with the configuration shown in Figure 11 B with Figure 10 B and Figure 11 A with Figure 10 A in configuration with receiver according to the transmitter of the 3rd example embodiment of the present invention.
The first and the 3rd embodiment enforcement that can be combined.That is, in the transmission mechanism of Fig. 5, control information and orthogonal code multiply each other, then take again LB as basis and random rotation shift sequence multiply each other, as shown in Figure 12 or Figure 13.Because be different for each community random rotation shift sequence, so can reduce presence of intercell interference.
Very clear from description above, when the multiplexing UL control information from different user in the many community mobile communication systems of the next generation, the present invention, by take community as basis or take UE as basis puts on each piece random phase or cyclic shift value, has reduced presence of intercell interference valuably.
Although illustrate and described the present invention with reference to some preferred embodiment of the present invention, they are only advantageous applications.For example, embodiments of the invention can be applicable to have the control information of a plurality of bits, for example CQI, and 1 bit control information.In addition, for the random value of the code sequence of control information, can take predetermined Resource Block as basis and the LB of take applies as basis.Therefore, it will be understood by those skilled in the art that in the situation that do not depart from the spirit and scope of the present invention that are defined by the following claims, can make the various variations in form and details to the present invention.
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.
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