TW201125304A - Method and apparatus for performing uplink transmission techniques with multiple carriers and reference signals - Google Patents

Abstract

A method and apparatus are described for performing uplink (UL) transmission techniques with multiple carriers. Multiple transmission techniques with low cubic metric (CM), especially for cell-edge wireless transmit/receive units (WTRUs), are preferred for long term evolution advance (LTE-A) systems. A method for performing efficient codeword-to-carrier mapping is also described. Furthermore, a method and apparatus are described for reference signaling in UL transmissions in LTE. The method and apparatus includes multiplexing precoded pilots, multiplexing multiple WTRUs in uplink multi-user multiple-input multiple-output (MU-MIMO), and multiplexing sounding reference signals (SRS).

Description

201125304 VI. Description of the invention: [Technical field to which the invention pertains] [0001] The present application relates to wireless communication. [Previous Technology_]· [0002] 098135420 In Long Term Evolution (LTE) systems, single carrier frequency division multiple access (sc_fdma) is used for uplink (UL) transmission because SC_FMA has a smaller cube. Metric (CM) or peak-to-average power ratio (pApR). The SC-FDMA transmission is similar to orthogonal frequency division multiplexing (〇FDM) transmission except that the modulated data is first spread using the discrete Fourier transform (DFT), and then mapped in an inverse fast Fourier transform (IFFT) block. On consecutive subcarriers. To improve the frequency domain scheduling of SC-FDMA, a similar multiple access scheme called Cluster DFT Expansion FDMA (CL-DFTS-FDMA) has been proposed. In this case, the DFT-expanded symbols do not have to be mapped onto consecutive subcarriers. Instead, the data can be mapped to non-contiguous clusters, where the cluster consists of many consecutive (four) carriers. The maximum bandwidth supported in LTE is 2 〇 MHz. In order to obtain data rates of up to 1 Gb/s, carrier aggregation (aggregati) has been proposed. In carrier aggregation, carriers of bandwidths of 20 MHz or less are aggregated and used for transmission. The aggregated carriers can be contiguous or non-contiguous. The LTE UL Reference Signal (RS) is based on the Zad〇ff-Chu sequence.

The Zadoff-Chu sequence is a family of constant amplitude zero autocorrelation (CAZAC) sequences. The cyclic shifts of the square root CAZAC sequence are orthogonal to each other, and the cross-correlation between different square root sequences is low. When UL is based on sc transmission, it is similar to LTE-like, and it is time-multiplexed with data (that is, transmission in OFDM symbols). For example, in LTE, there are two time slots for each subframe or transmission time interval (ΤΤί). Each time slot can be 0993015227 - Form number Α 0101 Page 4 / Total 3 page 201125304 Ο ο There are 7 OFDM symbols, and the middle OFDM symbol (the 4th OFDM symbol in the time slot) is used for pilot transmission . The multiplexing of RSs from different antennas of the WTRU has been previously studied. Some possible methods are multiplexing using frequency division multiplexing (FDM), including multiplexing of RSs from different antennas in frequency, and multiplexing using code division multiplexing (CM), including in frequency and / or time or any combination of the two multiplexes the RSs from the different antennas with the orthogonal codes. In LTE, multiple antennas can be used for UL transmission. In the case of multiple antennas, closed loop or open loop precoding and transmit diversity can be used. The current design of RS for UL in LTE systems, also known as pilot, assumes a single transmit antenna. When multiple antennas are used, a new reference signal for the additional antenna will be required. When multiple antennas are supported for UL transmission, the data modulation reference signal (MRS) can be precoded similarly to the data. Likewise, RSs from different antennas of the WTRU and RSs from multiple WTRUs may be multiplexed. Finally, sounding reference signals (SRS) from different antennas of the WTRU and sounding reference signals (SRS) from multiple WTRUs may be multiplexed. Large carrier CM or PAPR can be a problem when carrier aggregation is used for UL transmission. Thus, multiple access schemes with low CM, especially for the cell edge, are preferred for LTE-Advanced systems. There is a need for a method and apparatus for efficiently performing code-carrier mapping. SUMMARY OF THE INVENTION A method and a 098135420 apparatus for performing UL transmission techniques using multiple carriers are disclosed. A variety of transmission techniques with low CM, especially for WTRU edge form number A0101 page 5 / page 30 0993015227-0 201125304, are preferred for LTE-A systems. A method for performing efficient codeword-carrier mapping is also disclosed. Furthermore, a method and apparatus for reference signaling in UL transmissions in LTE is described. The method and apparatus include multiplexing a precoded pilot, multiplexing multiple WTRUs in a UL multi-user multiple input multiple output (MU-ΜΙΜΟ), and multiplexing the SRS. [Embodiment] The term "wireless transmitting/receiving unit (WTRU)" mentioned below includes but is not limited to user equipment (UE), mobile station, fixed or mobile subscriber unit, pager, cellular telephone, personal digital Assistant (PDA), computer or any other type of user device capable of operating in a wireless environment. The term "evolved Node B (eNodeB)" mentioned below includes, but is not limited to, a base station, a site controller, an access point (AP), or any other type of peripheral device capable of operating in a wireless environment. Table 1 below gives a list of possible combinations of multiple access schemes in the presence of a single carrier (i.e., no aggregated or aggregated carriers). Note that SC-FDMA is a specific case when the cluster DFT-S-FDMA has a cluster number of one. Table 1 No aggregation - aggregation. Adjacent carrier. 1 a. _ Set of DFT-S-FD3VIA. Group-set DFT-S-FDIvIA. lb- Goth set DFT-S-FDViA. 'N SOFDIVIA, non-contiguous carrier*·-> clustered DFT-S_FD; M; A. N SC-FDMA' 3. OFDK1A. OFOMA. There is a relationship between the number of codewords and the number of aggregated carriers. No. 1 098135420 Form No. A0101 Page 6 of 30 0993015227-0 201125304 The figure shows a codeword-carrier mapping scheme. In Figure 1, there are groups of adjacent carriers, and these groups are non-contiguous. For a given WTRU, when there are multiple codewords, several codeword-carrier mapping schemes can be implemented. In the first scheme, each codeword is fed into a separate DFT block and then mapped to a subcarrier in the IFFT block and then on a given component carrier or a group of adjacent carriers. Being transmitted. The input to the DFT block is a different codeword. The output of the IFFT block can be mapped to several adjacent carriers or a single carrier. In the second scheme, one codeword can be input to two or more DFT blocks (for example, one codeword is interleaved on different DFT blocks). In this case, the codewords are transmitted on different carriers and may benefit from frequency diversity. In the third scheme, one codeword can skip several carriers (i.e., not all carriers are used at a given time). In the fourth scheme, when multiple antennas are used for spatial multiplexing/precoding, layer switching using large delay cyclic delay diversity (CDD) on multiple carriers can be used. In the fifth scheme, if OFDM is used for the air interface, the codeword-carrier mapping method can also be used unless DFT precoding is not applied to the OFDM before the IFFT in SC-FDMA. The codeword-carrier mapping is related to the physical downlink control channel (PDCCH) format used. In one embodiment, there is one PDCCH for one carrier. Codewords can be transmitted on a single carrier. Alternatively, blocks of codewords can be transmitted on different carriers. There may be more than one PDCCH for one codeword. In another embodiment, there is one PDCCH for a group of carriers. Codeword at 098135420 Form No. A0101 Page 7 of 30 0993015227-0 201125304 The PDCCH is allocated on the carrier to which the transmission resource is allocated. There may be a single PDCCH for the codeword. Alternatively, blocks of codewords can be transmitted on different carrier groups. There may be more than one PDCCH for one codeword. In yet another embodiment, there is one PDCCH for one codeword. The PDCCH may allocate resources for the codeword on one or more carriers. The modulation order, coding rate and other parameters for different carriers may be the same or different, which may result in a larger PDCCH format. The details of performing ΜIM0 precoding using bandwidth aggregation in the codeword-carrier mapping scheme are given below. In LTE, precoding is combined with large delay CDD, so each layer has a similar SNR. Precoding with a large delay CDD is defined, where matrix W is a precoding matrix, and matrices D and U are known to those of ordinary skill in the art and are defined in the standard. E.g,

^ /(0 : = r(i)D{〇Dr Equation (1) can be expressed as equivalent to: XNr X 1 W = ( ^r,Vr KR RXr){ IW)) ~ ( Vr 1 : Equation (2) where 4 is the form of sequence change over k times of d cycles. Thus, different rows of the precoding matrix are used to precode the layers on different subcarriers. This improves diversity because now all layers All are transmitted through all the characteristic directions of the channel instead of the fixed layer. 098135420 Form No. A0101 Page 8 / Total 30 Page 0993015227-0 201125304 Directional mapping. When there are several carriers, (for a carrier, the same), large The delay (10) can be used to enable/break large delay CDDs after DFT expansion. Applying a large delay (10) after DFT unrolling may add pApR; for example when the precoding matrix W is exactly the identity matrix. Keeping ΜΕ the same and still benefiting from the advantages of transporting layers through several feature directions, the data stream (ie the modulated symbol stream) can be multiplexed before the DFT operation (ie in

In the time domain). For example, suppose there are two f streams, denoted as χΗ〇 χ2. When the application layer is multiplexed (or layer shifted), the input to the first dft may be XII, X21, X13, X23........ and the input of the second DFT may be X12, X22, X14, X24, where Xab represents the bth payout in the & layer. After the DFT is simplified, the precoding moment car evaluation and delay matrix D can be applied. Note that in this example, the modulation symbols are multiplexed in the time domain. The modulation symbol can be multiplexed block by block (layer shifting, such that each block of the modulation symbol corresponds to the number of data,

"Belt material includes, for example, an orthogonal frequency division multiplexing (OFDM) symbol or ~ time slot. In the other case, the unprecoded reference signal can be transmitted in the UL to enable the e-node to perform channel estimation. Alternatively, the precoded reference letter can be broken. This may allow e-Node b to directly estimate the effective channel. In the same way, the pilot of the 46 mb/o encoding/beamforming may have an enhanced received signal interference and noise ratio (SINR). 098135420 Using precoded pilots may result in more efficient use of the cyclic shift of the square root sequence. The number of orthogonal sequences is equal to the number of data streams. This may also reduce pilot overhead. Page 9 of 30 0993015227-0 201125304 Design of precoding RS The precoding of R S can be implemented in a similar way to precoding of resources. On the mother subcarrier, the vector of the pilot system _ 人 (four) coefficient is multiplied by the precoding matrix. The precoding is used for the normal sound cover τ %, so beamforming is also a kind of precoding, which may be precoding of rank 1 and broadband. As an example,

P1 and p2 are zero self-phases - two cyclically shifted cmc sequences', i.e. they are derived from the same square root sequence by applying a non-cyclic shift. These sequences are of length L. Thus, the sequence can be precoded (4) to L subcarriers. w is a precoding matrix of size VV, where the number of Nt疋 transmit antennas, and (iv) the number of data streams. On a given subcarrier k, the corresponding pilot coefficients_code (4) are multiplied. Contains pilots The vector of coefficients is too small (%χ丨). This operation is shown in equation (1) for two data streams and two transmit antennas, as follows:

Pm η Pm Ραι 丨 +p*2w2 Equation (3) Then, the coefficient, 丄, where k = 1, ..., Nt is transmitted from each antenna. When orthogonal sequences are used as reference signals, the same matrix can be used to precode all pilot sequences to maintain orthogonality between the two sequences. The precoded pilot sequence can be multiplexed using the multiplex technique described below to perform multiplexed pilot precoding on the precoded pilot by CDM in the frequency domain. CDMA can be used in the frequency domain using CDM. , (ie, positive 098135420 form number A0101 page 10 / total 30 pages 0993015227-0 201125304 intersection sequence is used as a reference signal). In particular, orthogonal sequences can be obtained by cyclic shifting from the same square root sequence. The number of sequences is equal to the number of streams. On each subcarrier, the corresponding coefficients from the precoded CAZAC sequence are transmitted. Figure 2 shows a multiplexed method for two data streams, (two orthogonal sequences), where the shading represents a different sequence. Multicasting of precoded pilots using CDM in the frequency and time domains To increase the number of pilots, time domain spreading can be used in addition to applying CDM in the frequency domain. In LTE, the UL RS is carried on an OFDM symbol for each time slot in the two time slots in the subframe. The orthogonal pilot sequences, after being precoded, can be spread over two or more OFDM symbols by using orthogonal codes, such as Walsh codes. For example, if spread over two OFDM symbols (where each OFDM symbol is in a time slot, as in LTE), the expansion matrix D 1 can be used for time domain expansion. If you expand on three OFDM symbols, you can use the expansion matrix 卩丨 | | 1. For example, a pre-J ee /V jee coded pilot sequence can be used to implement time domain expansion using D 丨1, which is multiplied by 1 in the first 0 FD Μ symbol And after multiplying by 1 in the second 0 FD Μ symbol, it is mapped to the corresponding subcarrier, and the first 0FDM symbol is used to transmit the reference signal (expressed as RS-0FDM). In addition, after the same precoding The pilot sequence can be multiplied by 1 in the first RS-0FDM symbol 098135420 Form No. A0101 Page 11 of 30 0993015227-0 201125304 and multiplied by -丨 in the second Rs-catch (10) symbol It is mapped to the corresponding subcarrier. When time domain expansion is used in the frequency domain except for CDM, the 'time domain expansion sequence' should be known to the order except for the base sequence and cyclic shift. Multiplexing of precoded pilots in the domain (F Μ ) As shown in Figure 3, the precoded RSs can also be multiplexed in the frequency domain. Corresponding to the antenna phase of the antenna material The first precoded reference signal can be transmitted, for example, on subcarrier k, for (4) subcarriers. Transmitted, this is equivalent to setting clock 2 = 0. With frequency domain multiplexing, the same pilot sequence can be used for all data streams because orthogonality is obtained in the frequency domain. The length of the lower 'square root sequence' may be L/m, where L is the number of subcarriers used for data transmission, and 111 is the repetition factor 'ie the number of antennas or data streams. Pre-frequency in the frequency domain and the code domain The coded pilot is multiplexed (CDM and fm). This is a combination of multiplexing the precoded pilots in the frequency and code domains. A set of subcarriers is allocated for transmission of two or more. a specific precoded reference signal. The precoded reference signal is multiplexed in the code domain as described above and mapped onto these subcarriers. Different sets of subcarriers are allocated for transmission of other precoded Reference signal. An example is given here in Figure 4. The odd-numbered subcarriers are allocated for transmission of two precoded reference signals (precoded reference signals 丨 and 2). The reference signal can be generated by precoding two orthogonal sequences For example, a precoding matrix is used. Subcarriers numbered evenly can similarly be used to transmit two other precoded reference signals (pre-edited 098135420 Form No. A0101 Page 12 / Yau 30 pages, ^, 0993015227-0 Reference signals 3 and 4) after the 201125304 code. In this example, the length of the square root sequence becomes L/2, because every other subcarrier is used to transmit the sequence. Pre-coded in time The pilot multiplexed (TDM) precoded pilot can also be multiplexed only in the time domain. In this case, different precoded RSs can be transmitted on different OFDM symbols. Multiplexing in MU-MIM0 When MU-MIM0 is used for UL transmission, the antenna and WTRU can be multiplexed. In one option, if each WTRU transmits a single data stream, then the above method can be applied as if each WTRU were a different data stream. In another option, the same method can still be used if each WTRU is allowed to have multiple streams. Signaling of the cyclic shift index When multiple antennas are used for UL transmission, the cyclic shift of the sequence (the sequences used for frequency domain spreading) can be signaled to the WTRU. In the case of pre-coded pilots, the number of required cyclic shifts is equal to the number of streams, not the number of transmit antennas. This means that the number may change dynamically, so the control signaling format should be properly designed to accommodate all possible choices. Some control channel format design choices are described below. The following implementations can be implemented if separate UL grant formats are used for MU-MIM0 and Single User ΜΙΜΟ (SU-MIM0), respectively. For SU-ΜΙΜΟ UL grants, cyclic shifts can be configured with higher layer signaling. This configuration may be cell-specific or WTRU-specific. The cyclic shift can be predetermined and may not change. A UL grant format with a reserved space of up to the maximum number of streams can be used, but this can result in inefficiencies. Different UL Authorizations can be used for different numbers of data streams 098135420 Form No. A0101 Page 13 of 30 0993015227-0 201125304. For example, if you support up to four streams, you can design four different formats. This may result in an increase in the number of blind detections. Implicit signaling of cyclic shifting can be used where there is a UL grant format and e-Node B signals the index of the first cyclic shift. Other formats can be derived using equations, such as continuous cyclic shifts. For MU-MIMO UL grants, cyclic shift is signaled if there is a limit to MU-MIM0 such that the number of streams is limited to one. If there is no such restriction, then the method proposed above for SU-MIM0 can be used. If the same control signaling format is used for SU-ΜΙΜΟ and MU-MIM0, the cyclic shift can be signaled and the method proposed above can be used. If time domain expansion is used for the pilot, the orthogonal sequence index can be determined. This can be signaled in a cell-specific manner or in a WTRU-specific manner. Alternatively, the orthogonal sequence index can also be derived from other parameters. The square root sequence and cyclic shift can be changed within the sub-frame or between the sub-frames. "Cycle shift group jump" may occur between groups of cyclic shifts. For example, if there are 6 cyclic shifts and 2 of the cyclic shifts are used at a given time, the skip mode can be {c 1, c 2 }, { c 3, c4}, {cl, c4}, etc. . Each cyclic shift may also jump independently of each other' ie no packets. The skip mode can be fixed or configured by W T R U specific or cell specific signaling. Open-loop precoding One form of precoding is open-loop precoding, where precoding matrices/vectors can be selected without any feedback. For example, for high speed W T R U , it may not be practical for the eNodeB to select a precoder to be used in the UL 098135420 Form No. A0101 Page 14 of 30 0993015227-0 201125304 . When open-loop precoding is used, and if the precoding is wideband or the same precoding matrix/vector is used for a large number of subcarriers, the above method for multiplexing the precoded RS can be used. Alternatively, if the precoding matrix/vector is used for a narrow band or a small number of subcarriers, for example, each subcarrier, then a non precoded RS can be used. Open loop and closed loop precoding can be configured by higher layer signaling, and then the corresponding RS transmission scheme can be used.

RS for 0FDMA

When using single carrier transmission, as shown above, RS and data usage time are multiplexed (ie, one or more OFDM symbols are used only for RS). In the case of UL grants for 0FDMA transmissions, the RS may be limited to resource element (RE) ranges rather than across the entire symbol. In this case, similar to the downlink, the RS can be transmitted on several 0FM symbols. The above method can also be similarly used for OFDM transmission.

In order to obtain a valid channel estimate for each layer as determined by the eNodeB, certain REs or groups of REs may be reserved for different columns (or rows) of the precoding matrix used. Channel estimates for each layer can then be determined using different sets of RE 〇. REs can be separated in time and / or frequency. Alternatively, in addition to using different sequences with good correlation characteristics, the pilots can be precoded and signaled in the same manner as the data (both on a set of R Es). The number and location of REs may depend on environmental factors such as speed or signal-to-noise ratio (SNR) or geometry, and the number of layers. The RE used to transmit the RS may be signaled as part of a broadcast, cell-specific or WTRU-specific signaling. SC and OFDM transmissions can be configured by higher layer signaling. Corresponding RS transmission 098135420 Form number A0101 Page 15 of 30 0993015227-0 201125304 The scheme is used. Probing RS (SRS) Multiplexing The foregoing method can be used to multiplex SRS between different WTRUs and finely different antennas. SRS transmissions can be precoded or non-precoded. In LTE, the maximum supported bandwidth is 2 〇 MHz. In order to increase this bandwidth, several component carriers can be aggregated, for example two 2G MHz component carriers. When several component carriers are used for UL, the WTRU power may not be sufficient to simultaneously detect all components. In this case, time multiplexing can be used to detect different component carriers between (4). Similarly, frequency multiplexing can be used where the _ component tank is not. In addition, a combination of the two can also be used. rS transmission for UL control channels: In the UL control channel, an open-loop wheel such as transmit diversity can be used. In this case T' may be derived from the non-precoded pilot of the money rather than the precoded pilot. The same method as the method used for the UL data channel can be used for the case where the precoding matrix can be regarded as a unit matrix, the matrix size is vv:, and Fig. 5 is an example of the block diagram of the eNodeB 500. The eNodeB 5 includes an antenna 505, a receiver 51A, a processor 515, and a transmitter 52A. The ΜΙΜΟ antenna 505 includes antenna elements so, μ%, μ%, and Μ, . It is achievable to draw four antenna elements in Figure 5, but that expansion to more or fewer antenna elements is achievable and should be apparent to those of ordinary skill in the art. Figure 6 is an example of a block diagram of the WTRU 600. The WTRU protocol includes a MIM0 antenna 605, a receiver 610, a processor 61 5, and a transmitter 620. 098135420 ΜΙΜΟ Antenna 605 includes antenna elements 605ι, 6〇5 Form No. A0101 Page 16 of 30 605^05/ 〇4 0993015227-0 201125304 Ο Although four antenna elements are drawn in Figure 6, they are expanded to More or fewer antenna elements are achievable and will be apparent to those of ordinary skill in the art. The WTRU 600 performs an uplink transmission. Processor 615 in WTRU 600 is configured to perform any of the embodiments disclosed above. For example, processor 615 can be configured to generate a modulation symbol, map the modulation symbol to at least two layers for spatial multiplexing when performing layer shifting in the time domain, such that modulation in one input stream The symbol can be multiplexed on multiple layers and DFT unwrapped on the modulated symbols after layer shifting. Processor 615 can be configured to apply a precoding matrix before or after DFT expansion after performing layer shifting (i.e., layer multiplexing) on the modulated symbols. Processor 615 can be configured to perform layer shifting of the modulated symbols block by block. A block of modulation symbols includes an OFDM symbol or a time slot. The processor 615 may be configured to apply the precoding matrix to the reference signal generated by cyclically shifting the square root sequence to generate a plurality of precoded reference signals, and map the precoded reference signal to Multiple subcarriers. The processor 61 5 in the WTRU 60 may be configured to generate a plurality of precoded reference signals (where each reference signal includes orthogonal pilot sequences cyclically shifted from orthogonal sequences of other reference signals), and The CDM is applied to the reference signal in the frequency domain based on the cyclic shift separation between the reference signals. The orthogonal pilot sequences can be spread over multiple orthogonal frequency division multiplexing (OFDM) symbols in the time domain. Embodiment 1. A method implemented by a WTRU to perform uplink transmission. 2. The method of embodiment 1, the method comprising generating a plurality of modulations 098135420 Form Number Α 0101 Page 17 of 30 0993015227-0 201125304 Symbol. 3. The method of embodiment 2, the method comprising mapping the plurality of modulation symbols onto at least two layers for spatial multiplexing while performing layer shifting in the time domain such that an input stream is present The plurality of modulation symbols are multiplexed on multiple layers. 4. The method of embodiment 3, the method comprising performing DFT expansion on the modulation symbols after the plurality of layers are shifted. 5. The method of embodiment 4, comprising performing OFDM processing on the modulated symbols after the plurality of DFTs are expanded to generate a plurality of OFDM symbols on the plurality of layers. 6. The method of embodiment 5, the method comprising transmitting the plurality of OFDM symbols over a plurality of antennas. 7. The method as in any one of embodiments 3-6, further comprising applying a precoding matrix after layer shifting the plurality of modulated symbols in the time domain. 8. The method of embodiment 7, wherein the plurality of modulation symbols are shifted by a block-by-block formation. 9. The method of embodiment 8 wherein the plurality of modulation symbols in a block are processed for transmission in an OFDM symbol. 10. The method of embodiment 8 wherein the plurality of modulation symbols in a block are processed for transmission in a time slot. 11. The method as in any one of embodiments 2-10, further comprising applying a precoding matrix to the plurality of reference signals generated by cyclically shifting the square root sequence to generate a plurality of precodings After the reference signal. 12. The method of embodiment 11 comprising mapping the plurality of precoded reference signals onto a plurality of subcarriers. 098135420 Form No. A0101 Page 18 of 30 0993015227-0 201125304 13. The method of Embodiment 1, the method comprising applying a precoding matrix to a plurality of references generated by cyclically shifting a base sequence of the base The signal is used to generate a plurality of precoded reference signals. 14. The method of embodiment 13 comprising mapping the plurality of precoded reference signals onto a plurality of subcarriers. The method of any one of embodiments 13-14 wherein the plurality of reference signals are CAZAC sequences. 16. The method of embodiment 15 wherein the plurality of reference signals are based on a Zadoff-Chu sequence. The method of any one of embodiments 13-16, further comprising expanding the plurality of precoded pilot sequences over the plurality of 0 F D Μ symbols in the time domain. 18. The method of embodiment 17, wherein the green array "丨j 1 is used

The pre-coded pilot sequence is spread on J-L two OFDM symbols. 19. A WTRU for performing uplink transmission.

20. The WTRU of embodiment 19, the WTRU comprising a processor, the processor configured to generate a plurality of modulation symbols. 21. The WTRU as in embodiment 20 wherein the processor is configured to map the plurality of modulated symbols onto at least two layers for spatial multiplexing while performing layer shifting in the time domain such that The plurality of modulation symbols in an input stream are multiplexed on multiple layers. 22. The WTRU of embodiment 21 wherein the processor is configured to perform DFT expansion on a plurality of layer shifted modulation symbols. 23. The WTRU as in embodiment 22, wherein the processor is configured to perform OFDM processing on the plurality of DFT-expanded modulation symbols to include 098,135,420, form number A0101, page 19, total 30 pages, 0993015227- 0 201125304 Multiple OFDM symbols are generated on multiple layers. 24. The WTRU of embodiment 23, the WTRU comprising a plurality of antennas for transmitting the plurality of OFDM symbols. The WTRU as in any one of embodiments 21-24, wherein the processor is configured to apply a precoding matrix after layer shifting the plurality of modulated symbols. The WTRU as in any one of embodiments 20-25, wherein the processor is configured to perform layer shifting of the plurality of modulated symbols block by block. 27. The WTRU of embodiment 26 wherein a plurality of modulation symbols in a block are processed for transmission on an OFDM symbol. 28. The WTRU of embodiment 26 wherein the plurality of modulation symbols in a block are processed for transmission in a time slot. The WTRU as in any one of embodiments 2-28, wherein the processor is configured to apply a precoding matrix to a plurality of reference signals generated by cyclically shifting a base sequence of the base. A plurality of precoded reference signals are generated, and the plurality of precoded reference signals are mapped onto a plurality of subcarriers. 30. The WTRU as in embodiment 19, the WTRU comprising a plurality of antennas. 31. The WTRU as in embodiment 30, the WTRU comprising a processor configured to apply the precoding matrix to the plurality of reference signals generated by cyclically shifting the base root sequence to generate the plurality of reference signals The precoded reference signal maps the plurality of precoded reference signals to a plurality of subcarriers. 32. The WTRU as in embodiment 31 wherein the plurality of reference signals are CAZAC sequences. 098135420 Form No. A0101 Page 20 of 30 0993015227-0 201125304 33. The WTRU as in embodiment 32, wherein the plurality of reference signals are based on a Zadoff-Chu sequence. The WTRU as in any one of embodiments 31-33, wherein the processor is configured to develop a plurality of pre-coded pilot sequences over a plurality of OFDM symbols in the time domain. [0005] 35. The WTRU as in embodiment 34, wherein the precoded pilot sequence is spread over the 1 1 • I ~ 1· two OFDM symbols using a matrix |-|丨. Ο

Although the features and elements of the present invention are described above in terms of specific combinations, each feature or element can be used alone or in combination with other features and elements of the present invention without or without other features and elements. Used in various situations. The method or flowchart provided by the present invention can be implemented in a computer program, software or firmware executed by a general purpose computer or processor, wherein the computer program, software or firmware is tangibly embodied in a computer readable storage medium. Examples of computer readable storage media include read only memory (ROM), random access memory (RAM), scratchpad, cache memory, semiconductor memory device, internal hard disk, and removable magnetic disk. Magnetic media such as magnetic media, magneto-optical media, and CD-ROM discs and digital versatile discs (DVDs). Suitable processors, for example, include: general purpose processors, special purpose processors, conventional processors, digital signal processors (DSPs), multiple microprocessors, one or more microprocessors associated with a DSP core, Controller, Microcontroller, Dedicated Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA) Circuit, any other integrated circuit (1C) and/or state machine 098135420 Form No. A0101 Page 21 of 30 0993015227-0 201125304 A software-related processor can be used to implement a radio frequency transceiver for use in a wireless transmit receive unit (WTRU), user equipment (UE), terminal, base station, radio network controller (RNC), or any Used in a host computer. The WTRU may be used in conjunction with modules implemented in hardware and/or software, such as cameras, camera modules, video phones, speaker phones, vibration devices, speakers, microphones, television transceivers, hands-free headsets, keyboards, Bluetooth ® module, FM radio unit, liquid crystal display (LCD) display unit, organic light emitting diode (0LED) display unit, digital music player, media player, video game console module, internet browser And/or any wireless local area network (WLAN) module or wireless ultra-wideband (UWB) module. BRIEF DESCRIPTION OF THE DRAWINGS [0006] The present invention may be understood in more detail from the following description, which is given by way of example, and can be understood in conjunction with the accompanying drawings, wherein: FIG. Codeword-carrier mapping scheme; Figure 2 shows multiplexing with orthogonal codes (CDM); Figure 3 shows multiplexing in frequency (FDM); and Figure 4 shows the use of FDM and The CDM performs multiplexing; Figure 5 shows an example of a block diagram of an evolved Node B (eNode B); and Figure 6 shows an example of a WTRU block diagram. [Main component symbol description] 098135420 Form number A0101 Page 22 of 30 0993015227-0 201125304 [0007]

DFT: Discrete Fourier Transform OFDM: Orthogonal Frequency Division Multiplexing 505, 605: ΜΙΜΟ Antenna ΜΙΜΟ: Multiple Input Multiple Output 505, 5059, 505q, 5054: Antenna Element 510, 61 0: Receiver 515, 615: Processor 520 , 620: transmitter

BOSi, 6052, 6053, 6054: Antenna Element WTRU, 600: Wireless Transmitting/Receiving Unit eNodeB, 500: Evolved Node B 0993015227-0 098135420 Form Number A0101 Page 23 of 30

Claims (1)

201125304 VII. Patent application scope: 1. A method implemented by a wireless transmitting/receiving unit (wtru) to perform multi-input multiple-output (ΜΙΜΟ) uplink transmission, the method comprising: generating a plurality of modulation symbols; The modulation symbols are mapped onto at least two layers for spatial multiplexing while performing layer shifting in the time domain such that the plurality of modulation symbols in the input stream are multiplexed on multiple layers; Performing a discrete Fourier transform (10) τ ) 'expansion on the modulated shift sign after the layer shift; performing orthogonal frequency division multiplexing (〇F.DM) processing on the m-modulated modulation symbols to be on multiple layers Generating a plurality of OFDM symbols; and transmitting the OFDM symbols over a plurality of antennas. 2. The method of claim i, wherein the method further comprises: applying a precoding matrix after layer shifting the plurality of modulated symbols in the time domain. 3. The method of claim 2, wherein the plurality of modulation symbols are shifted by block-by-block formation. 4. The method of claim 3, wherein the plurality of modulation symbols in the _ blocks are processed for transmission in a primary crossover multiplex (OFDM) symbol. 5. The method of claim 3, wherein the plurality of modulation symbols in one block are processed to be transmitted in the _ time slots. 6. The method of claim 1, further comprising: applying a precoding matrix to the plurality of reference signals generated by cyclically shifting the pair-square root sequence to generate a plurality of precodings Subsequent reference signal; 098135420 Form number A0101 Page 24/Total 3 page 0993015227-0 201125304 Ο ίο · 11 Ο 098135420 and map the plurality of precoded reference signals onto multiple subcarriers. - A method implemented by a wireless transmit/receive unit (WTRU) to perform multiple input multiple output (MIMO) uplink transmission, the method comprising: applying a precoding matrix cyclically by shifting a root sequence Generating a plurality of reference signals to generate a plurality of precoded reference signals; and mapping the plurality of precoded reference signals onto the plurality of subcarriers. The method of claim 7, wherein the plurality of reference signals are constant amplitude zero autocorrelation (C1ZAC) sequences. The method of claim 7, wherein the plurality of reference signals are based on a Zadoff-Chu sequence. The method of claim 7, wherein the method further comprises: expanding the plurality of precoded pilot sequences over a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain. The method of claim 10, wherein the plurality of precoded J 1 L 1 j frequency sequences are spread over the two OFDM symbols using a matrix 1-1. a wireless transmit/receive unit (WTRU) for performing multiple input multiple output (ΜΙΜΟ) uplink transmission, the WTRU comprising: a processor configured to generate a plurality of modulated symbols, the plurality of modulated symbols Mapping to at least two layers for spatial multiplexing while performing layer shifting in the time domain 'so that the plurality of modulated symbols in the one input stream are multiplexed on multiple layers, shifted at that level Discrete Fourier Transform (DFT) expansion is performed on the subsequent modulation symbols, and orthogonal division is performed on the modulation symbols after the complex DFT unfolded form bat number A0101 page 25/30 pages ' 0993015227-0 201125304 Multiplex (〇FDM) processing to generate a plurality of OFDM symbols on multiple layers; and multiple antennas 'for transmitting the plurality of 〇FDM symbols. 13. The town (four) as described in claim 12, wherein the processor is configured to apply a precoding matrix after layer shifting the plurality of modulation symbols. The WTRU as claimed in claim 12, wherein the processor is configured to perform layer shifting of the plurality of modulated symbols block by block. 15 • As described in item 14 of the patent application, a plurality of modulators in one of the blocks are processed = to be transmitted in an .. Orthogonal Frequency Division Multiplexing (OFDM) symbol. 16. The method of claim 4, wherein the plurality of modulation symbols in one block are processed for transmission in a time slot. 17. The "scratch" described in claim 12, wherein the processor is configured to apply a precoding matrix to a plurality of reference signals generated by cyclically shifting a root sequence. a plurality of precoded reference signals and mapping the plurality of precoded reference signals onto a plurality of subcarriers. 18 wireless transmit/receive units for performing multiple input multiple output (ΜΙΜΟ) uplink transmission a (WTRU), the WTRU comprising: a plurality of antennas; and a processor configured to apply a precoding matrix to generate a plurality of pre-references by a plurality of reference signals generated by cyclically shifting a root sequence An encoded reference signal, and mapping the plurality of precoded reference signals onto a plurality of subcarriers. 19. 098135420 _TRU as described in claim 18, wherein the plurality of reference form numbers A0101 26 Page / Total 30 pages ' 0993015227-0 201125304 The signal is a constant amplitude zero autocorrelation (CAZAC) sequence. 20 , 21 . 22 . WT WTKII as described in claim 18, where The plurality of reference numbers are based on a Zadoff-Chu sequence, such as the WTRU of claim 18, wherein the processor is configured to deploy on a plurality of orthogonal frequency division multiplexing (〇FDM) symbols in the time domain. The plurality of pre-coded pilot sequences, such as the WTRU of claim 21, wherein a plurality of precoded pilot-to-frequency sequences are spread over two OFDM symbols using a matrix "I1 ο 098135420 Form No. A0101 Page 27 / Total 30 Page 0993015227-0