KR20100058389A - A method for transmitting radio signal in a wireless mobile communication system - Google Patents

Abstract

PURPOSE: A method for transmitting a radio signal in a wireless mobile communication system is provided to increase the amount of transmitted information without changing a bit encoder through a conventional technique. CONSTITUTION: A block of bits is transmitted through a PUSCH(Physical Uplink Shared Channel) of one sub-frame, and is scrambled in a scrambling block by a scrambling sequence of a UE(User Equipment). A block of scrambled bits is modulated in a modulation mapper block, and the generated complex-valued symbols are converted into SC-FDMA symbols through a transformed precoding block, a resource element mapper block, and an SC-FDMA(Single Carrier Frequency Division multiple Access) signal generation block.

Description

A METHOD FOR TRANSMITTING RADIO SIGNAL IN A WIRELESS MOBILE COMMUNICATION SYSTEM}

The present invention relates to a method for generating and transmitting a radio signal in a broadband wireless mobile communication system. In particular, the present invention relates to a method for generating and transmitting a Single Carrier-Frequency Division Multiple Access (SC-FDMA) signal.

According to the SC-FDMA (Single Carrier-Frequency Division Multiple Access) or DFTs OFDM (Discrete Fourier Transforms Orthogonal Frequency Division Multiplexing) scheme, the value of Peak-to-Average Power Ratio (PAPR) or Cubic Metric (CM) of a transmission signal You can lower the transmission. In addition, according to this method, the signal can be efficiently transmitted by avoiding the non-linear distortion interval of the power amplifier. This method is currently used as an up-link transmission method of 3GPP LTE (3rd Generation Partnership Project Long Term Evolution).

A transmitter of an uplink PUSCH (Physical Uplink Shared Channel) of 3GPP LTE may have a structure as shown in FIG. 1. The transmission stage includes a Discrete Fourier Transform (DFT) block, a sub-carreir mapping block, an Inverse Fast Fourier Transform (IFFT) block, and a Cyclic Prefix (CP) insertion block.

If one of the schemes of FIG. 2A or 2B is mapped to map the DFT bitstream to the frequency domain, the transmitted SC-FDMA symbol is a single carrier. It satisfies the single carrier property. FIG. 2A illustrates localized mapping and FIG. 2B illustrates distributed mapping. Currently, 3GPP LTE defines a local mapping of (a) of FIG. 2.

For data, the data signal generated in the time domain is frequency mapped through the DFT precoder block and then transmitted through the IFFT block. However, in the 3GPP, a reference signal is directly generated in a frequency domain without a DFT precoder block and then transmitted through an IFFT block for a reference signal (RS). The reference signal used to decode the received SC-FDMA symbol may be generated through the process as shown in FIG. 3.

The time structure of the reference signal according to the time axis is shown in FIG. 4A or FIG. 4B. 4 (a) shows a case of a normal CP and FIG. 4 (b) shows a case of an extended CP.

Clustered DFT-s OFDM is a variation of the conventional SC-FDMA, which is divided into several sub-blocks after the DFT precoder block and then divided into sub-blocks. It's a way to map them away from each other. An example of a transport block diagram mapping to a single carrier is shown in FIG. 5 and an example of applying to a multi-carrier is shown in FIGS. 6 and 7. In other words, FIG. 5 applies clustered DFT-s in an intra-carrier, and FIGS. 6 and 7 apply clustered DFT-s in an inter-carrier. At this time, it is also possible to use the two in combination. In addition, referring to FIG. 6, in case of using a continuous carrier allocation scheme, when a subcarrier spacing between adjacent carriers is aligned, a signal is generated through a single IFFT block. I can see that I can. In addition, referring to FIG. 7, in the case of using a non-contiguous carrier allocation scheme, carriers are not adjacent to each other and a plurality of IFFT blocks are used.

FIG. 8 is a chunk specific DFTs OFDM system for performing DFT precoding on a chunk basis. This system can be used for both continuous and discontinuous allocations. This is also called Nx SC-FDMA.

For example, 3GPP LTE-A intends to transmit more information than 3GPP LTE. PUCCH format 2 / 2a / 2b of 3GPP LTE currently can transmit information having a quantity of 2 bits for RI. However, when the number of down-link codewords increases to two or more, the number of transmit antennas increases to four or more, or carrier aggregation occurs, more information is available. It needs to be sent. As a simple example, if up to eight transmit antennas are supported and the rank is considered to be up to eight, a total of four bits of RI is required. In the current architecture capable of transmitting only two bits, four RIs cannot be transmitted. In addition, when carriers are aggregated in addition to the carriers used in the related art, information such as CQI, PMI, RI, and Acknowledgment / Negative acknowledgment (A / N) for additional carriers may be transmitted in the current structure. none. Therefore, a new method for transmitting this additional information is needed.

The technical problem to be solved by the present invention is to transmit a radio signal by increasing the amount of information transmitted without changing the structure of the conventionally used bit encoder.

In a wireless mobile communication system according to an aspect of the present invention for solving the above problems, a method of transmitting a (N-1) bits of the first bit string consisting of N bits in the first encoder or Generating a second bit string by inputting to a second encoder, and transmitting a radio signal generated by modulating the generated second bit string, wherein the upper ( When the remaining one bit except for N-1) bits has a first value When the above (N-1) bits are input to the first encoder and the above one bit has a second value The above (N-1) bits are input to the second encoder, and the above (N-1) bits are input to the first encoder and the value of the above second bit string is generated. (N-1) bits are inputted to the above second encoder and generated It may have the (complementary) relationship.

At this time, preferably, the binary number b _i output from the first encoder or the second encoder is given by Equation (1).

Formula (1)

Where a ₀ , a ₁ , a ₂ , a ₃ , ..., a _A-1 are input bits of the first encoder or the second encoder, and M _{i, n} are the first encoder or A predetermined B * A constant for the second encoder above, where A and B above are predetermined natural numbers.

을

이라고 표기하고 위의 제2 인코더에 사용되는

을

라고 표기할 때에, i1=i2이고 n1=n2인 경우,

과

는 서로 보수 관계를 갖는다.In this case, preferably, the first encoder

of

And used for the second encoder above

of

When i1 = i2 and n1 = n2,

and

Have a conservative relationship with each other.

In this case, preferably, the above B = 20 and the above A = 13.

In this case, preferably, the mobile station transmits a SC-FDAM (Single Carrier Frequency Division Multiple Access) symbol.

In a method for transmitting a radio signal in a wireless mobile communication system according to another aspect of the present invention, a first (N-1) bits of the first bit sequence consisting of N bits unique to the user equipment (user equipment) Scrambling with a scrambling code or a second scrambling code to generate a second bit string, and transmitting a radio signal generated by modulating the generated second bit string, wherein among the N bits above If one bit other than the above (N-1) bits has the first value, the above (N-1) bits are scrambled using the first scrambling code above, and the above one bit is In the case of having a second value, the (N-1) bits are scrambled using the second scrambling code.

In a wireless mobile communication system according to another aspect of the present invention, a method of transmitting a radio signal comprises the steps of: scrambling (N-1) bits of a first bit string consisting of N input bits to generate a second bit string; Generating a modulation symbol sequence by modulating the generated second bit string according to a value of one bit except for the (N-1) bits among the N input bits. Generating a Single Carrier Frequency Division Multiple Access (SC-FDMA) signal from a modulation symbol sequence of and transmitting the generated SC-FDMA signal, which is generated when the above one bit has a first value The above modulation symbol sequence is a transition of a predetermined phase in which the above modulation symbol sequence generated when the above one bit has a second value has a non-zero value.

Preferably, the above predetermined phase is the same value for all modulation symbols generated by the above modulation.

Preferably, the above predetermined phase has an independent value for each modulation symbol generated by the above modulation.

At this time, preferably, in the radio signal transmission method, phase shift is independently performed for each subcarrier included in one SC-FDMA (Single Carrier-Frequency Division Multiple Access) symbol.

In a method for transmitting a radio signal in a wireless mobile communication system according to another aspect of the present invention, by inputting (N-1) bits of the input bit string consisting of N bits to the first encoder or the second encoder, Generating a bit string, generating a second bit string by scrambling the generated first bit string with a first scrambling code or a second scrambling code unique to user equipment; Modulating the second bit stream according to the value of the remaining one bit except for the above (N-1) bits of the bits to generate a modulation symbol string, and SC-FDMA from the modulation symbol string above Generating a (Single Carrier Frequency Division Multiple Access) signal and transmitting the generated SC-FDMA signal, and if the one bit of the first value has a first value, the above (N-1) bits Input to the first encoder above When the above one bit has a second value, the above (N-1) bits are input to the second encoder, and the (N-1) bits are input to the first encoder. The value of the generated first bit string has a complementary relationship with the value of the first bit string generated by inputting the above (N-1) bits to the second encoder. If the bit has the first value above the first bit string is scrambled with the first scrambling code above, and if the one bit above has the second value above the first bit string is above The above modulation symbol sequence, which is scrambled with a second scrambling code and is generated when the above 1 bit has the above first value, is generated above the above modulation symbol sequence when the above 1 bit has the above second value The symbol string is shifted by a predetermined phase having a nonzero value.

According to the present invention, it is possible to increase the amount of information transmitted without modifying the bit encoder according to the prior art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description set forth below in conjunction with the appended drawings is intended to explain exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details to assist in a thorough understanding of the present invention. However, those skilled in the art will appreciate that the invention may be practiced without these specific details. For example, the following description will focus on certain terms, but need not be limited to these terms and may refer to the same meaning even when referred to as any term. In addition, the same or similar components throughout the present specification will be described using the same reference numerals.

PUCCH (Physical Uplink Control Channel) structure used in 3GPP LTE is an example of a channel structure based on Code Division Multiplexing (CDM).

In 3GPP LTE, the PUCCH has the following format.

Format 1: SR (Scheduling Request) only with On-off keying (OOK)

Format 1a and 1b (ACK / NACK only)

Format 1a: BPSK ACK / NACK for 1 codeword

Format 1b: QPSK ACK / NACK for 2 codeword

Format 2 (CQI only with QPSK)

Format 2a and 2b (CQI + ACK / NACK)

The present invention can be used in format 2 / 2a / 2b.

Table 1 shows an example of a modulation scheme and the number of bits per substream for each format described above. For example, when PUCCH format 2 is used, QPSK is used as a modulation scheme, and it can be seen that the number of bits per subframe is 20 bits.

Table 2 shows an example of the number of PUCCH modulation reference symbols per slot defined according to the type of CP and the format of the PUCCH. For example, in PUCCH format 2, the number of modulation reference symbols used for normal Cyclic Prefix (normal CP) is 2, and the number of symbols used in extended Cyclic Prefix (extended CP) is 1 to be.

Table 3 shows modulation reference signal positions for different PUCCH formats. For example, in PUCCH format 2, the modulation reference signal is located in the first and fifth symbols when the standard CP is used, and the modulation reference signal is located in the fourth symbol when the extended CP is used.

Channel coding for UCI channel quality information (UCI CQI) in 3GPP LTE is as follows.

Channel quality bits a ₀ , a ₁ , a ₂ , a ₃ , ..., a _A-1 are input to the channel coding block, where A represents the number of bits. A may be 13. The number of channel quality bits may be determined according to each transmission format indicated in Tables 5-7. Channel quality information is encoded using "(20, A) code" as shown in Table 4. The codewords of the (20, A) code are a linear combination of 13 basis sequences M _{i, n} . In Table 4, the value at the index (i, n) position represents the value of M _{i, n} . For example, the value of the second column (that is, M _{i, 1} ) of the second row of Table 4 (i.e. i = 1) is 1, which is assigned to M _1,1 Value.

The bits after encoding are represented by b ₀ , b ₁ , b ₂ , b ₃ , ..., b _B-1 . Where B = 20 and b _i is given by Equation 1.

Where a ₀ corresponds to the first bit of the first field and a _A-1 corresponds to the last bit of the last field. This information consists of up to 13 bits and consists of 20 bits of output using the (20, A) code. This bit information is modulated with QPSK.

For example, the CQI format for wideband report is defined as follows.

Table 5 shows a UCI field for channel quality information for wideband reporting. Here, assume a single antenna port, transmit diversity or open loop spatial multiplexed Physical Downlink Shared Channel (PDSCH) transmission.

Table 6 shows UCI fields for channel quality information (CQI) and precoding matrix information (PMI) for wideband reporting. Here, it is assumed that closed loop spatial multiplexing PDSCH tranmssion.

Table 7 shows a UCI field for rank indication (RI) for wideband transmission.

If the rank of the four antenna ports is greater than 1, referring to Table 6, 4 bits are allocated to the wideband CQI field, 3 bits are allocated to the spatial difference CQI field, and 3 bits are allocated to the precoding matrix indication field. 4 bits are allocated. In addition, referring to Table 7 when supporting 4 antenna ports and up to 4 layers, 2 bits are allocated to the rank indication field. That is, by adding up the maximum number of bits allocated to each field by the above-described configuration, it can be confirmed that control information of maximum 13 bits (4 bits + 3 bits + 4 bits + 2 bits) can be transmitted. Such maximum 13-bit information can be encoded using the (20, A) code shown in Table 4, but information larger than 13 bits cannot be encoded using only Table 4.

The present invention relates to a method for effectively transmitting additional information without affecting a structure currently defined as a method for transmitting additional information. That is, the present invention relates to a method of transmitting additional information without changing the conventional (20, A) code as shown in Table 4.

According to the present invention, while using the (20, A) code used for the existing PUCCH format 2 / 2a / 2b as it is, it is possible to further increase the amount of information of the PUCCH information that can be represented up to 13 bits at present.

<Example 1>

A new (20, A) code set can be generated by performing a complement operation on the (20, A) code used in the existing standard, and additional information can be transmitted using this. Here, performing a complement operation on a value means changing '1' to '0' and '0' to '1'. In other words, by performing the complement operation on Table 4, a new code set can be generated as shown in Table 8.

It can be seen that each element of Table 8 is a complementary value of each corresponding element of Table 4.

Referring to Tables 6 and 7, it is possible to know the number of bits used for wideband reporting according to the combination of the number and rank of antenna ports. For example, in the case of 2 antenna ports and rank = 1, the number of bits used for transmitting CQI, PMI, and RI for wideband reporting in closed loop spatial multiplexing PDSCH transmission is 7 Bits (4 bits wideband CQI + 2 bits PMI + 1 bit RI). That is, channel quality bits a ₀ , a ₁ , a ₂ , a ₃ , ..., a _A-1 having A = 7 are input to the channel coding block. Assuming this channel quality bit is "1110000", b ₀ , b ₁ , b ₂ , b ₃ , ..., b _B-1 generated using the conventional (20, A) code becomes "01101001000001010010". . On the other hand, b ₀ , b ₁ , b ₂ , b ₃ , ..., b _B-1 generated using the complementary code of Table 8 are “10010110111110101101” and are generated using the code of Table 4 The complement of the value. In addition, it can be seen that the value of the bit information generated by Table 8 is modulated by QPSK and the value of the bit information generated by Table 4 is modulated by QPSK. In this way, two times the information can be sent using a complement code set, and as a result, the amount of information can be increased by one bit. Using the method according to the present embodiment, it is possible to transmit an RI bit that is increased according to the rank increase, or to add an additional bit according to additional CQI information or PMI information.

The added bits may be LSB (Least Significant Bit mapping) or MSB (Most Significant Bit) mapped to the conventional control information bits. That is, one newly added information bit may be added to the front or the rear of the conventional control information bit string. For example, when extending RI bits, LSB mapping may be applied, and MSB mapping may be applied for CQI + PMI bit extension.

According to other embodiments of the present invention, the amount of information may be extended through phase shift in symbol units. That is, as shown in Table 8, rather than using a conventional method of extending the code (20, A), additional information may be obtained through phase shift in symbol units.

Hereinafter, when the symbol is generated by applying M-PSK modulation to b ₀ , b ₁ , b ₂ , b ₃ , ..., b _B-1 generated through the code (20, A), the present invention is implemented. Explain how to apply the example. For example, it may be assumed that a symbol is generated by applying QPSK modulation. Rotate a symbol generated using QPSK modulation by any phase (eg, exp (j * φ)) within the QPSK constellation, or rotate the entire QPSK constellation by any phase (eg exp (j * φ)). By rotating, information expansion through symbol phase shift can be obtained.

In this case, when generating a symbol using QPSK modulation, the above φ value may have a value of (+ π / 4) to (-π / 4).

<Example 2>

In one embodiment of the present invention, the amount of information can be extended by performing a phase shift within the QPSK constellation.

As in the previous example, assuming that the channel quality bit " 1110000 " with A = 7 is input to the channel coding block, then b ₀ , b ₁ , b ₂ , b ₃ , .. , b _B-1 becomes "01101001000001010010". Modulating this with QPSK, (1-j, -1 + j, -1 + j, 1-j, 1 + j, 1 + j, 1-j, 1-j, 1 + j, -1 + j) It is represented by a symbol with a value of. For convenience, the effect on each UE-specific scrambling sequence is omitted here. If additional information is needed, the additional information can be transmitted while reducing the CM or PAPR by rotating the symbol thus generated in an arbitrary phase (eg φ = π / 2). By this method, as in the bit extension method using the complement of the first embodiment, twice the information can be transmitted, and as a result, information extension of 1 bit can be achieved. As a result, the added information is (-1 + j, 1-j, 1-j, -1 + j, -1-j, -1-j, -1 + j, -1 + j, -1-j, 1-j).

<Example 3>

In another embodiment of the present invention, the amount of information can be extended by phase shifting the entire QPSK constellation.

As in the example shown in Embodiment 2, a bit generated using the (20, A) code may be mapped to a symbol through QPSK modulation. In this symbol mapping process, additional information may be transmitted by mapping different QPSK constellations through phase shift. Additional information can be transmitted through the new QPSK constellation rotated in any phase (φ) in the conventional QPSK constellation. Various phase shifts can be considered depending on the number of bits needed for the additional information needed. For example, when one bit is additionally required, additional information may be transmitted through a new QPSK constellation generated by shifting the conventional QPSK constellation by φ = π / 4.

Similarly, if an additional 1.585 bit (= 3 times the value corresponding to information) is needed, additional information transmission can be achieved through a phase shift of φ = π / 6 * n (n = 0,1,2) in the QPSK constellation of the existing data. It is possible. Through these three different QPSK constellations, it is possible to represent information corresponding to three times the information that can be represented by existing QPSK constellations. Using the method according to the present embodiment, it is possible to transmit an RI bit that is increased according to the rank increase, or to add an additional bit according to additional CQI information or PMI information.

<Example 4>

In another embodiment of the present invention, the amount of information can be extended by performing phase shift in symbol units.

As in Embodiment 3, the bits generated using the (20, A) code are mapped to symbols via QPSK modulation. In this symbol mapping process, instead of increasing the amount of information by performing the same phase shift over all symbols as in Embodiment 3, additional information is obtained by rotating each symbol by an arbitrary phase (for example, exp (j * φ)). Can transmit For example, we generate b ₀ , b ₁ , b ₂ , b ₃ , ..., b _B-1 of 20 bits of channel quality bits of channel quality A bits, which are converted into 10 symbols using QPSK modulation. Mapped. The amount of information of 1 bit per symbol can be increased by rotating the phase by? = 0 or? =? / 4 in each of these symbols. Therefore, in the case of 10 symbols, the amount of information can be increased by 10 bits. In the case of performing the phase shift independently for each symbol as in the fourth embodiment, compared to the case of performing the phase shift for all symbols as in the third embodiment, the robustness against constellation detection error (constellation detection error) is increased. robustness).

Example 5

In another embodiment of the present invention, the amount of information can be extended by shifting the phase in subcarrier units.

In the method according to the second to fourth embodiments, the same phase shift is applied to all subcarriers corresponding to one symbol. On the other hand, it is possible to expect a bit extension per subcarrier by rotating each of the subcarriers in a symbol in an arbitrary phase (e.g., exp (j * φ)) to transmit more information. As an example, assuming a symbol composed of twelve subcarriers, one bit extension can be expected for each subcarrier by rotating a phase by? = 0 or? =? / 4 in each subcarrier. Thus, 12 bits can be extended in the case of 12 subcarriers. This method can be used with the phase shift in symbol units of the fourth embodiment.

<Example 6>

According to other embodiments of the present invention, the amount of information may be extended using a UE-specific scrambling sequence.

를 생성한다. 이 과정은 수학식 2를 통해 수행될 수 있다.A UE wishing to transmit additional information may transmit additional information using a UE-specific scrambling sequence different from the conventional UE-specific scrambling sequence used for the transmission information. The UE wishing to transmit the information through the PUCCH may use b ₀ , b ₁ , b ₂ , b ₃ , ..., b _B-1 generated using the code (20, A) to UE-specific scrambling sequence c (i Scrambled through)

. This process may be performed through Equation 2.

은 QPSK 변조를 통해 심볼로 매핑된다. This scrambled bit

Is mapped to a symbol via QPSK modulation.

9 illustrates positions of symbols to which reference signals are mapped in one slot.

As can be seen in Figure 9, in the case of the standard CP, the second and sixth symbols are used for the reference signal (RS) transmission. For RS transmission, each UE uses a CDM-based sequence with a specific cyclic shift value. When a specific UE needs additional information transmission, by using a UE-specific scrambling sequence different from the conventional UE-specific scrambling sequence for transmission of additional information on the same CS (Cyclic Shift) value for RS transmission In addition, up to 20 bits of information can be transmitted. That is, one UE may use a scrambling code set corresponding to a maximum of 20 bits as a code space for information transmission by using the same CS value and / or different UE-specific scrambling sequences. Alternatively, a subset consisting of some code sequences whose cross-correlation is lower than a specific coefficient, or required bits, in consideration of the cross-correlation of each sequence of a code sequence set for transmission of corresponding control information. You can select any course sequence according to the number and use the configured subset. In this case, any code sequence may be selected randomly or according to an arbitrary rule.

As the scrambling code, a PN (Pseudo Noise) code may be used, and a scrambling code (for example, quasi-orthogonal sequence) other than the code set used conventionally may be used.

Here, the UE-specific scrambling sequence to be additionally allocated may be pre-determined with a specific relationship with respect to the UE-specific scrambling sequence that is basically allocated. Alternatively, the UE-specific scrambling sequence allocated additionally may be signaled explicitly or implicitly mapped by a specific mapping relationship.

In addition, the present invention can be applied to a multi-carrier environment. In a situation in which the linkage is linked to 2 DL-1UL (2 DownLink-1 UpLink), a control channel (eg, CQI or RI or A /) corresponding to each downlink component carrier is transmitted through the uplink. Assume that N) is transmitted on one 1UL carrier. Here, two downlinks may be regarded as two conventional LTE 20 MHz bands. Two additional UE-specific scrambling sequences may be allocated. In this case, an initial seed value of the scrambling sequence (assuming PN code) allocated for DL carrier # 0 is designated as a, and DL carrier # The initial seed value of the scrambling sequence allocated for 1 may be specified as a + M * n. In this case, M is an arbitrary integer and n is a carrier number. That is, the scrambling sequence may be generated according to the element carrier number or the absolute frequency assignment (FA) number (integer or Hz representation).

10 illustrates an example of a process in which a baseband signal is generated by a PUSCH as an example of a processing procedure in which embodiments according to the present invention may be performed.

A block of bits transmitted on the PUSCH of one subframe may be scrambled in the scrambling block 1001 by a UE-specific scrambling sequence before being modulated. A block of scrambled bits generated in this way may be modulated in a modulation mapper block 1002 to generate a block of complex-valued symbols. . The complex symbol generated in this way may be converted into an SC-FDMA symbol through a transform precoding block 1003, a resource element mapper block 1004, and an SC-FDMA signal generation block 1005. have. Detailed technical details on each block can be found in the 36211 document of 3GPP.

The information amount increasing method using the (20, A) code extension of the above-described embodiment 1 may be performed in a step before the scrambling block 1001 of FIG. In addition, the process of increasing the amount of information using different UE-specific scrambling sequences of the above-described Embodiment 6 may be performed by the scrambling block 1001 of FIG. 10. In addition, the process of increasing the amount of information using the constellation phase shift of the modulation symbols of Embodiments 2 to 4 may be performed by the modulation mapper block 1002 of FIG. 10.

Referring to the process of FIG. 10 and the above-described embodiments, it is obvious that the technical features of the above-described embodiments can be used in combination with each other.

As described above, the present invention has proposed an extension method using a bit extension method using a complement, an extension method using a phase shift in symbol units, and a different UE-specific scrambling sequence for additional information transmission. By using this method, when the downlink codewords increase from the conventional two to four, additional information about the third codeword and the fourth codeword may be transmitted. Currently, 3GPP LTE defines up to 2 bits of rank indicator (RI) to support up to rank 4. However, if the number of available antennas increases to eight, the RI bits need to be extended to support rank eight. The present invention can also be used for such RI bit extension. In addition, it enables additional information transmission in a carrier aggregation situation. That is, information about CQI, PMI, RI, A / N, etc. for additional carriers may be transmitted through the present invention.

According to the embodiments of the present invention described above, when an information bit is added to the above input bit string in processing the input bit string, a processing block for processing the above input bit string according to the value of the added information bit By changing the characteristics of the block), the characteristics of the transmission signal transmitted from the mobile station can be changed. The characteristics of the modified transmission signal can be detected at the receiving end (e.g., base station) to detect what value the added information bits have by detecting which processing block has what characteristic. In this way, a larger amount of information can be exchanged than the above information of the input bit string. In order to implement different characteristics of the above-described processing block, a parameter of one processing block may be changed or used, or a plurality of processing blocks having the same function may be defined in advance. Since the above input bit string may go through a plurality of processing steps, the inventive concept may be independently applied to each processing step.

The embodiments described above are the components and features of the present invention are combined in a predetermined form. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention. The order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment, or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.

In this document, embodiments of the present invention have been described based on data transmission / reception relations between a base station and a terminal. Here, the base station has a meaning as a terminal node of the network that directly communicates with the terminal. The specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases. That is, it is obvious that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station. 'Base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like. In addition, the term "terminal" may be replaced with terms such as a user equipment (UE), a mobile station (MS), a mobile subscriber station (MSS), and the like.

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of a hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the above detailed description should not be interpreted as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

The present invention can be used in a device used in a broadband wireless mobile communication system.

1 is a diagram illustrating an example of a structure of a transmitting end of a physical uplink common channel (PUSCH) of 3GPP LTE.

2 shows an example of a method of mapping a DFT bitstream to a frequency domain.

3 is a diagram illustrating an example of a process of generating a reference signal used for decoding a SC-FDMA symbol.

4 is a diagram illustrating an example of a structure along a time axis of a reference signal.

FIG. 5 illustrates a method of mapping a plurality of subblocks generated by dividing a DFT precoder block to a single carrier.

6 and 7 illustrate a method of mapping a plurality of subblocks generated by dividing a DFT precoder block to multiple carriers.

8 shows an example of a chunked DFTs system that performs DFT precoding on a chunk basis.

9 illustrates positions of symbols to which reference signals are mapped in one slot.

10 illustrates an example of a process in which a baseband signal is generated by a PUSCH as an example of a processing procedure in which embodiments according to the present invention may be performed.

Claims (11)

In the method for transmitting a radio signal in a wireless mobile communication system, Generating a second bit string by inputting (N-1) bits of the first bit string consisting of N bits to the first encoder or the second encoder at the mobile station; And Transmitting a radio signal generated by modulating the generated second bit stream at the mobile station Including, If one of the N input bits except for the (N-1) bits has a first value, the (N-1) bits are input to the first encoder, and the one bit is In case of having a second value, the (N-1) bits are input to the second encoder. The value of the second bit string generated by inputting the (N-1) bits to the first encoder is a value of the second bit string generated by inputting the (N-1) bits to the second encoder. Having a complementary relationship with Wireless signal transmission method. The method of claim 1, The binary number b _i output from the first encoder or the second encoder is given by Equation (1). Formula (1)

Here, a ₀ , a ₁ , a ₂ , a ₃ , ..., a _A-1 are input bits of the first encoder or the second encoder, and M _{i, n} are the first encoder or the second A predetermined B * A constant for the encoder, wherein A and B are predetermined natural numbers. The method of claim 2 Used for the first encoder

of

And used for the second encoder

of

When i1 = i2 and n1 = n2,

and

Has a complementary relationship with each other. The method of claim 2 And B = 20 and A = 13. In the method for transmitting a radio signal in a wireless mobile communication system, Generating a second bit string by scrambling (N-1) bits of the first bit string consisting of N bits at a mobile station with a first scrambling code or a second scrambling code unique to user equipment ; And Transmitting a radio signal generated by modulating the generated second bit stream at the mobile station Including, If one of the N bits except for the (N-1) bits has a first value, the (N-1) bits are scrambled using the first scrambling code, and the one When the bit has a second value, the (N-1) bits are scrambled using the second scrambling code. Wireless signal transmission method. 6. A method according to any one of the preceding claims, wherein the mobile station transmits a SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol. In the method for transmitting a radio signal in a wireless mobile communication system, Generating a second bit string by scrambling (N-1) bits of the first bit string consisting of N input bits at the mobile station; Generating a modulation symbol sequence by modulating the generated second bit string according to a value of one of the N input bits except the (N-1) bits of the N input bits; And Generating a single carrier frequency division multiple access (SC-FDMA) signal from the modulation symbol sequence at the mobile station and transmitting the generated SC-FDMA signal Including; Wherein the modulation symbol sequence generated when the one bit has a first value is shifted by a predetermined phase having a value other than 0, wherein the modulation symbol sequence generated when the one bit has a second value sign, Wireless signal transmission method. The method of claim 7, wherein And wherein the predetermined phase is the same value for all modulation symbols generated by the modulation. The method of claim 7, wherein Wherein the predetermined phase has an independent value for each modulation symbol produced by the modulation. The method of claim 7, wherein In the wireless signal transmission method, phase shift is performed independently for each subcarrier included in one Single Carrier-Frequency Division Multiple Access (SC-FDMA) symbol. Wireless signal transmission method. In the method for transmitting a radio signal in a wireless mobile communication system, Generating a first bit string by inputting (N-1) bits of the N bit bits of the input bit string to the first encoder or the second encoder at the mobile station; Generating a second bit string by scrambling the generated first bit string with a first scrambling code or a second scrambling code unique to user equipment; Generating a modulation symbol sequence by modulating the second bit string according to a value of one of the N bits except for the (N-1) bits of the N bits; And Generating a single carrier frequency division multiple access (SC-FDMA) signal from the modulation symbol sequence at the mobile station and transmitting the generated SC-FDMA signal Including, The (N-1) bits are input to the first encoder when the one bit has a first value, and the (N-1) bits are the first value when the one bit has a second value. 2 is input to the encoder, the value of the first bit string generated by the (N-1) bits are input to the first encoder is generated by the (N-1) bits are input to the second encoder Has a complementary relationship with a value of the first bit string, When the one bit has the first value, the first bit string is scrambled with the first scrambling code, and when the one bit has the second value, the first bit string is the second scrambling code. Scrambled into The modulation symbol sequence generated when the one bit has the first value is shifted by a predetermined phase in which the modulation symbol sequence generated when the one bit has the second value has a value other than zero. That is, Wireless signal transmission method.

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