Feedback signaling error detection and checking in MIMO wireless communication systems

Method and device for detecting and verifying feedback signaling errors in MIMO communication systems

FIELD OF THE INVENTION

[001] This order is related to the field of wireless communications.

BACKGROUND

[002] A goal of the Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) [Third Generation Partnership Project (3GPP) for Long Term Evolution (LTE)] is to develop new technologies, new architectures and new methods for determine options and settings in wireless communication systems for the purpose of improving spectral efficiency, reducing latency, and better utilizing the radio resource to provide better user experiences, as well as richer services and applications for users at lower costs.

[003] Wireless communication systems usually require retroinformative signaling to enable communications by signal emission and reception channels. For example, enabling an automatic hybrid transmission request (HARQ) requires acknowledgment / non-acknowledgment feedback (ack / nack). Adaptive modulation coding (AMC) requires qualitative channel index (CQI) feedback from a receiver. Multiple reception and multiple transmission (MIMO) or pre-coding systems require feedback from the classification and / or pre-coding matrix index (PMI) from a receiver. Typically, this type of retroinformative signaling is protected by coding and the signaling does not have error detection and verification capabilities. However, efficient signaling is essential to an evolved universal mobile telephone system (UMTS) over a terrestrial radio access network (EUTRAN). The addition of error checking (EC) and error detection capabilities to the retro-informative signaling system enables more advanced applications. The addition of error detection and verification (EC) capability can enable advanced signaling schemes, as well as improved performance of connections from multiple reception and multiple transmission (MIMO) systems, reduced system overhead, and increased system capacity .

[004] An example of an application that may require error detection and

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2/22 verification capability for retroinformative control signaling is the validation of pre-coding information. Pre-encoding information validation is used to inform a wireless transmission and reception unit (WTRU) about the pre-encoding information that is used in a Node B so that the current channel seen by the wireless transmission and reception unit (WTRU) ) that contains pre-encoding effects can be reconstructed by the wireless transmission and reception unit (WTRU). This is required for accurate data detection for multiple reception and multiple transmission (MIMO) systems using pre-coding, lightning, or similar.

[005] A wireless transmission and reception unit (WTRU) can retrofit a pre-coding matrix index (PMI) or antenna weight to a base station (BS) or an evolved Node B (eNB). To inform a wireless transmission and reception unit (WTRU) of the pre-coded arrays used in an evolved Node B (eNB), the evolved Node B (eNB) can send a validation message to the wireless transmission and reception unit ( WTRU). Each matrix that the wireless transmission and reception unit (WTRU) signals as feedback for the evolved Node B (eNB) can be indicated by PMIj 1, PMIJ2 ... PMIjN, where N is the integral value equivalent to the total number of matrices. The evolved Node B (eNB) can send a validation message containing information about N PMIs indicated to the wireless transmission and reception unit (WTRU) as PMCkl, PMCk2 ... PMCkN.

[006] Each pre-coding matrix index (PMI) can be represented by L bits. The value of L depends on the antenna configuration and the sizes of the codebooks of the multiple reception and multiple transmissions (MIMO) system.

[007] Communication resources can be assigned to a wireless transmission and reception unit (WTRU). A resource block (RB) consists of subcarriers M, for example, M = 12, where M is a positive integral. A resource block group (RGB) or subband can include N_RB RBs, where N_RB can be equal to, for example, 2, 4, 5, 6, 10, 25 or greater. A system bandwidth can have one or more resource block groups (RGBs) or sub-bands depending on the size of the bandwidth and N_RB value per RGB or sub-band.

[008] A wireless transmission and reception unit (WTRU) can retroactively inform

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3/22 a pre-coding matrix index (PMI) for each resource block group (RGB) or subband that is configured for it. The terms RGB and subband can be used interchangeably. N RGBs, in which N <N_RBG, can be configured or selected by a wireless transmission and reception unit (WTRU) for the purpose of feedback and generating reports. If N RGBs or sub bands are configured for a WTRU, or selected by a WTRU, then the WTRU returns N PMIs to the evolved Node B (eNB). The eNB will be able to send the validation message consisting of N PMIs back to the WTRU.

[009] Let us allow N_PMI to be a number of bits that represents a PMI. The total number of bits for the WTRU PMI feedback is N x N_PMI. The maximum number of bits per WTRU PMI feedback is equivalent to N_RBG x N_PMI bits per feedback instance. When a pre-coding validation method is used, the maximum number of bits per PMI validation message is N_RBG x N_PMI bits per validation message.

[0010] Table 1 shows a number of bits per WTRU PMI feedback and signaling assuming that N_PMI = 5 bits. The numbers are summarized for bandwidths of 5, 10, and 20 MHz. The second row, N_RB, presents the number of RBs per RBG or subband, which is in a range between 2 and 100 for 20 MHz. third row, N_RBG has a range from one to fifty. The fourth row is the total number of bits used for WTRU PMI retro signaling per feedback instance. This refers to frequency selective pre-coding feedback or multiple PMI feedback.

[0011] Table 1 - Maximum number of bits for PMI return and PMI validation

<td></td><td colspan="3">5 MHz 800 subcarriers</td><td colspan="5">10 MHz 600 subcarriers</td><td colspan="5">20 MHz 1200 subcarriers</td>

<td>N_RB by RGB</td><td> 2</td><td> 5 10</td><td> 25</td><td> 2</td><td> 5</td><td> 10</td><td> 25</td><td> 50</td><td> 2</td><td> 5</td><td> 10</td><td> 25</td><td> 50 100</td>

<td>N_RGB per band</td><td> 13</td><td> 5 3</td><td> 1</td><td> 25</td><td> 10</td><td> 5</td><td> 2</td><td> 1</td><td> 50</td><td> 20</td><td> 10</td><td> 4</td><td> 2 1</td>

<td>Max bit return PMI per return</td><td> 65</td><td> 25 15</td><td> 5</td><td> 125</td><td> 50</td><td> 25</td><td> 10</td><td> 5</td><td> 250</td><td> 100</td><td> 50</td><td> 20</td><td> 10 5</td>

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4/22

<td>Max bit per message signaling PMI</td><td> 65</td><td> 25</td><td> 15</td><td> 5</td><td> 125</td><td> 50</td><td> 25</td><td> 10</td><td> 5</td><td> 250</td><td> 100</td><td> 50</td><td> 20</td><td> 10</td><td> 5</td>

<td></td><td colspan="15">Assumed 12 carriers per RB N_RG: number of resource blocks N_RBG: number of glupor RB in frequency N_PMI: number of bits to represent a PMI Maximum number of bits for PMTR return from WTRU: N_RGB x N_PMI bits Maximum number of bits for eNB validation message: N_RGB x N_PMI bits</td>

[0012] The PMI feedback and PMI validation may require over 250 bits per instance of feedback and per validation message as shown in the table above.

[0013] A feedback error significantly degrades the connection and the performance of the system. It would be desirable for the feedback bits to be protected with error checking (for example, channel coding). Furthermore, knowing if there is an error in a retroinformative signaling improves the performance of the system, as well as the performance of the connection, as erroneous feedback can be avoided. In addition, knowing if there is an error in retroinformative signaling enables the use of advanced signaling schemes, or applications such as confirmation of pre-coding and indicative schemes. The pre-coding confirmation can be sent to confirm how correct the retro-information signaling is if there is no error in the retro-informational signaling.

[0014] An isolated bit or a sequence of bits can be used to confirm pre-coding, which may be sufficient for some applications. The use of advanced signaling such as validating pre-encodings using acknowledgments will significantly reduce signaling overhead. Therefore, error checking and detection is desirable.

[0015] US 2006/0209980 Al describes a method for transmitting data in a MIMO system. A base station performs scheduling based on feedback information received from a plurality of terminals. Scheduling

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5/22 includes determining the best terminal for each transmitting antenna based on the feedback information, calculating a sum ratio of the feedback information, deciding the pre-coding matrix and terminals for each transmitting antenna, maximizing the transmission rate. sum and carry out the transmission with the pre-coding matrix and the chosen terminals.

[0016] EP 1628415 A1 describes a mobile radio communication system in which a base station, with a plurality of antennas, employs at least two downlink paths through at least two of the antennas to transmit a signal to a radio equipment. user. Each downlink path has a complex channel coefficient. A feedback path is used to return complex weight information from user equipment to the base station. The error detection mechanism can be used in the feedback path.

[0017] WO 2008/001192 A1 describes user op equipment which receives a feedback signal with antenna weight and a protective signal component from a remote transmitter. A control unit checks for correct signal reception using the control signal component.

[0018] US 2004/015603 discloses a method for selecting a CRC based on the number of bits to be transmitted over a bus.

SYNTHESIS

[0019] Here is described a method and device for checking, detecting, and protecting errors through signaling of the retrainformative type, in a wireless communication system. Retro-informational signaling can include channel quality index (CQI), pre-coding matrix index (PMI), hierarchical ordering and / or recognition / non-recognition (ACK / NACK). This present work includes a wireless transmission and reception unit (WTRU) performing a method that includes the provision of a pre-coding matrix index (PMIs), producing error checking bits (EC), encoding the PMI (s) and Ec bits, and transmitting the pre-coding matrix index (PMIs) and error checking bits (EC). The method can be applied to other feedback information, such as hierarchy of the qualitative channel index (CQI), recognition / non-recognition (ack / nack), and

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6/22 similar.

BRIEF DESCRIPTION OF THE ILLUSTRATIONS

[0020] A more detailed understanding can be obtained from the following description, provided as an example in conjunction with the drawings accompanying this submission:

figure 1 shows a wireless communication system that includes a plurality of wireless transmission and reception units (WTRUs) and an evolved Node B (eNB);

- figure 2 is a functional block diagram of the wireless transmission and reception unit (WTRU) and the evolved Node B (eNB) of the wireless communication system of figure 1;

figure 3 is a block diagram of the feedback of the pre-coding matrix index (PMI) with verification and correction of errors according to an embodiment;

figure 4 is a block diagram of feedback from the pre-coding matrix index (PMI) with verification and correction of errors according to another embodiment;

Figure 5 is a block diagram of the pre-coding matrix index (PMI) with error checking and correction according to an alternative embodiment;

figure 6 is a block diagram of feedback from the pre-coding matrix index (PMI) with error checking and correction according to another alternative embodiment;

Figure 7 is a block diagram of feedback from the pre-coding matrix index (PMI) with error checking and correction in accordance with yet another alternative embodiment;

- figure 8 is a block diagram of feedback from the pre-coding matrix index (PMI) with error checking and correction in accordance with yet another alternative embodiment;

- figure 9 is a block diagram of the pre-coding matrix index (PMI) and the qualitative channel index (CQI) with verification and correction of

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7/22 errors according to yet another alternative embodiment;

- figure 10 is a block diagram of feedback from the pre-coding matrix index (PMI) and the qualitative channel index (CQI) with error checking and correction in accordance with yet another alternative embodiment;

- Figure 11 is a feedback block diagram of the pre-coding matrix index (PMI), the qualitative channel index (CQI), and the recognition / non-recognition (ack / nack), with error checking and correction according with yet another alternative embodiment; and

- Figure 12 is a block diagram of feedback from the pre-coding matrix index (PMI), the qualitative channel index (CQI), and the recognition / non-recognition (ack / nack), with verification and correction of errors according to with yet another alternative embodiment.

DETAILED DESCRIPTION

[0021] From this point on, whenever reference is made, the wireless transmission and reception unit (WTRU) terminology will include, but not be limited to, user equipment (UE), a mobile station, a subscriber unit fixed or mobile, a pager, a cell phone, a personal digital assistant (PDA), a computer, or any other type of user device capable of operating in a wireless environment. From this point on, whenever reference is made, the base station terminology will include, but not be limited to, a Node B, a site controller, an access point (AP), or any other type of device capable of interconnections in a wireless environment.

[0022] Figure 1 shows a wireless communication system 100 including a plurality of wireless transmission and reception units (WTRUs) 110 and an evolved Node B (eNB) 120. As shown in figure 1, the transmission units and wireless reception (WTRUs) 110 are in communication with the evolved Node B (eNB) 120. Although three WTRUs 110 and one eNB 120 are shown in figure 1, you should be aware that any combination of wired or wireless devices can be included in a wireless communication system 100.

[0023] Figure 2 shows a functional block diagram 200 of WTRU 110 and the

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8/22 eNB 120 of the wireless communication system 100 of figure 1. As shown in figure 2, the WTRU 110 is in communication with the eNB 120. The WTRU 110 is configured to transmit feedback and control signals to the eNB 120. The WTRU is also configured to receive and transmit feedback and control signals from eNB as well as eNB. Both eNB and WTRU are configured to process signals that are modulated and encoded.

[0024] In addition to the components that can be found in a typical WTRU, the WTRU 110 includes a processor 215, a receiver 216, a transmitter 217, and an antenna 218. The receiver 216 and transmitter 217 are in communication with the processor 215 Antenna 218 communicates with both receiver 216 and transmitter 217 in order to facilitate wireless data transmission and reception.

[0025] In addition to the components that can be found in a typical eNB, the eNB 120 includes a processor 225, a receiver 226, a transmitter 227, and an antenna 228. Receiver 226 and transmitter 227 are in communication with the processor 225 Antenna 228 communicates with both receiver 226 and transmitter 227 to facilitate wireless data transmission and reception.

[0026] A WTRU can transmit a feedback signal (for example, PMI feedback) to an eNB. Error checking (EC) bits [for example, cyclic redundancy checking (CRC)] can be linked to the feedback signal (for example, PMI feedback). Both the feedback signal (for example, PMI) and the error checking (EC) bits can be coded prior to transmission. The feedback signal can include PMI, CQI, hierarchy, ACK / NACK, or other type of feedback signal. While this work references a PMI bit, a CQI bit, an EC bit and similar examples, anyone skilled in the art will recognize that PMI feedback, CQI feedback, and error checking and correction can consist of multiple bits, as in fact they consist of most cases. Although feedback signals such as PMI or CQI are used as examples, other types of feedback signals can also be used.

[0027] Channels of different types can be used to transmit and carry a retroinformative signal. For example, both control and informational channels can be used to carry the retroinformative signal. a

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9/22 example of a control type channel is the physical signal emission control channel (PUCCH). An example of an informational type channel is the physical signal emission sharing channel (PUSCH). However, anyone skilled in the art will recognize that the method and device presented here does not depend on a choice of channels.

[0028] The PMI and EC bits can be encoded together, with or without information bits. Both data type and control type channels can be used to transmit the feedback signal and error checking (EC) bits. For example, an informational type channel [for example, a physical signal emission sharing (PUSCH) channel] can also be used to transmit PMI bits and EC bits.

[0029] In contrast, PMI and EC bits can be encoded with a primary encoding scheme, and information bits can be encoded with a secondary encoding scheme. Each of the coding schemes can be different. For example, convolutive encoding or Reed Muller encoding can be used for the retrainformative type signal while the turbo encoding is used for informational type signaling. Alternatively, the coding schemes may be the same, but with different parameters and configurations that deal with different error rate requirements for retro-informational signaling and informational type signaling. The informational type data channel (for example, PUSCH) can be used to transmit PMI and EC bits. The data control type channel (for example, PUCCH) can also be used to transmit PMI and EC bits.

[0030] PMI and EC bits can be separately coded for each group, if a grouping is used for retroinformative signaling.

[0031] All PMI or EC bits can be fed back or reported at the same time. For example, all EC and PMI bits can be reported in the same transmission time interval (TTI). Alternatively, the bits of the retroinformative type and the error checking bits can be reported at another time. For example, PMI bits and / or EC bits can be divided into groups and reported in different TTIs.

[0032] Error checking and detection methods, such as cyclic redundancy checking (CRC), can be used. If the CRC is used, you can

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10/22 is, for example, 24-bit CRC or 16-bit CRC. The length of the CRC may vary, and the length actually used may depend on design decisions.

[0033] The cyclic redundancy check (CRC) bits can be attached to retroinformative type signals, and transmitted by an informational type channel for transporting the retroinformative type signaling bits and CRC bits. Retro-informational signs can be, for example, PMI, CQI, hierarchical, or ACK / NACK. The informational type of data channel can be, for example, a physical signal emission sharing (PUSCH) channel. An informational type data channel has a large capacity and can accommodate a relatively large number of bits. Therefore, the CRC can be, for example, a 24-bit CRC, a 16-bit CRC, or a CRC of some other length. Long CRCs can be used, and are preferable as they allow for better error checking. While this can add additional overhead due to the addition of the CRC bits, PUSCH may have the ability to handle the increased number of bits. The use of a data channel, such as a PUSCH, allows the transmission of signals, such as, PMI, CQI, hierarchical, and ACK / NACK in a single TTI. Therefore, a retro-informational signaling with a long CRC, which provides improved error checking capabilities, can actually be implemented.

[0034] Alternatively, CRC bits can be attached to retro-informational signals, and transmitted over a controller-type channel. The CRC can be a 24-bit CRC, a 16-bit CRC, or a CRC of another length. Typically, controller-type channels may not contain sufficiently large capacity to carry a large number of bits. In order to transmit the CRC bits and the retroinformative type signals, the transmission can be divided and transmitted on several occasions. The PMI feedback signal can be divided, and transmitted across several TTIs. For example, a PMI can be transmitted on each ΤΠ until all feedback signals are transmitted. CQI signals as well as other feedback signals can be managed in a similar way.

[0035] PMI, CQI, and other retro-informational signals can be transmitted separately at different times or by different TTIs. In general, a channel of the

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11/22 controller type (for example, PUCCH) may not carry a large number of bits at a time, and if there is a large number of feedback bits that need to be sent, the feedback bits can be divided or separated into groups. Each group can be reported, one at a time. Each feedback instance can contain a single PMI, CQI, some other feedback signal, or some combination of feedback signals. The CRC can be fed back or transmitted at the same time (in the same ΤΊΊ) as PMI or CQI. Alternatively, the CRC can be fed back or transmitted separately from the PMI or CQI. That is, CRC can be transmitted on different occasions, or on TTIs different from the occasions or TTIs on which the PMI or CQI is transmitted. The CRC can also be divided into segments or groups, and each CRC segment can be transmitted or fed back with a feedback signal simultaneously or in the same TTI. Each CRC can also be transmitted at another time or in a different TTI.

[0036] The use of CRC attached to the feedback signal can apply to a single feedback signal, such as a PMI and / or a CQI. Such a single feedback signaling scheme can be used when selective non-frequency feedback or broadband feedback is used (one return per full bandwidth or per configured bandwidth).

[0037] Other methods of checking or detecting errors such as parity checking (including single bit parity checking), or block parity checking, for example, can also be used. The present work contained herein is not limited to any particular error checking scheme, as will be recognized by anyone who is versed in the state of the art.

[0038] Coding schemes such as, for example, convolutive coding, Reed-Solomon coding, or Reed-Muller coding, can be used. Other coding schemes, for example, turbo coding and low density parity check (LDPC) coding, can also be considered. If feedback is transmitted via an informational data type channel [for example, a physical signal emission sharing (PUSCH) channel], convolutive or block encoding may be appropriate, as the informational type channel of data (eg PUSCH) allows the transmission of a large number of bits. The Reed-Muller encodings

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12/22 or Reed-Solomon may also be suitable due to the moderate number of bits to be encoded using such encoding schemes. The present work contained herein is not limited to any particular coding scheme, as will be recognized by anyone who is versed in the state of the art.

[0039] Figure 3 is a block diagram 300 of PMI feedback with error checking and correction according to an embodiment. Multiple PMIs configured as PMI_1 302, PMI_2 304, PMI_3 306 until arriving at PMI_1 308 and PMI_N 310 are shown in figure 3. EC 312 bits are attached to the PMI 316 signal. EC 312 bits could be 24-bit long CRC bits , 20 bits long, or 16 bits long. Other lengths of CRC can also be used. PMI bits (302-310) and EC 312 bits are encoded by a channel encoding function 314 prior to transmission. Channel coding can be done in conjunction with all PMIs and ECs. The jointly encoded PMIs and EC encodings can be transmitted at the same time or in the same TTI. The jointly encoded PMIs and EC encodings can be transmitted at different times or at different TTIs. Alternatively, channel coding for each PMI and EC bits can be performed separately, or for a group of PMIs and EC. The EC bits can be divided into segments and each EC bit segment can be separately encoded into channels and transmitted.

[0040] For example, if there is an integral number N of PMIs, each PMI can have 4 bits and each EC can have 24 bits, using, for example, 24-bit CRC. The total number of bits is 4N +24 bits. The total number of bits can be encoded together using channel encoding (for example, convolutive encoding). The encoded bits can be transmitted or fed back in a single time and in a single ΤΓΊ. The total number of encoded bits can also be transmitted or fed back on several different occasions, or on different TTIs. For example, the encoded bits can be transmitted an integral number M times in different M TTIs. Each TTI can transmit (4N + 24) / M of original information and CRC bits. The (4N + 24) / M of original information and CRC bits in each ΤΊΊ can contain PMI bits and / or CRC bits. If the TTI contains a combination of PMI and CRC bits, then 4N / M PMI bits and 24 / M CRC bits can be

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13/22 included in a single TTI if M = N, 4 PMI bits and a fractional portion of the CRC bits can be transmitted in a single TTI.

[0041] Alternatively, a 24-bit CRC can be divided into 6 segments, each with 4 bits, which is equivalent to the number of bits in a PMI. Each PMI and each CRC segment can be separately or jointly encoded and transmitted in a TTI.

[0042] The EC 312 bits can be a CRC, for example. The channel encoding function 314 can be convolutive encoding, for example. Error detection and verification methods, such as parity checking, can also be used. Other channel encoding methods, such as Reed-Muller encoding and Reed-Solomon encoding, for example, can also be used.

[0043] Each PMI can represent pre-encoding information for a subband, an RGB, a group of subbands, or a broadband. For example, PMI_1 can be a broadband PMI (average pre-encoding information for an entire band), and PMI_2 through PMI_N can be sub-bands PMIs or PMIs with calculated averages, each corresponding to pre-encoding information for a sub band, and RGB, or a group of sub bands.

[0044] Similarly, CQI and other retro-informational signals can be added with error checking capability by attaching the CRC, with a coded and transmitted channel as previously described.

[0045] PMI feedback signaling can be combined in groups with separate error checking for each group of PMIs. The EC bits can be attached to each group of PMIs before channel coding.

[0046] Figure 4 is a block diagram 400 of PMI feedback with error checking and correction according to another embodiment, in which PMI_1 402, PMI_2 404, and PMI_3 406 are grouped together and a first error check ( EC1) 408 is attached. PMI_4 410, PMI_5 412 and PMI_6 414 are grouped together and a first error check EC (1) 408 is attached. PMI_4 410, PMI_5 412 and PMI_6 414 are grouped together and attached with EC (2) 416. PMI_N-2 418, PMI_N-1 420 and PMI_N 422 are grouped together and attached with EC (G) 424. PMI (402-406, 410

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14/22

414, 418-422) and EC 408, 416, 424 are encoded by channel encoding function 426.

[0047] As stated above, the EC can be a CRC. A method of checking, detecting, and correcting errors can be selected based on a total number of bits that are encoded. The EC can use, for example, a long or short CRC, a single parity bit, or a block parity bit check. Other methods of checking, detecting, and correcting errors, such as advanced parity checking, for example, can be used.

[0048] The channel encoding function can use, for example, convolutive encoding or Reed-Solomon encoding. Other encoding methods, such as block encoding, turbo encoding, or LDPC, for example, can be used.

[0049] PMIs can be divided into several groups and groups of PMIs can be transmitted at different transmission intervals (ΤΊΊ). Groups of PMIs can also be transmitted in a single ΤΊΊ. Each group can be reported after encoding the channel. This is called frequency-selective feedback and reporting from multiple PMIs. CQI, hierarchy, and ACK / NACK signals can also be fed back or reported based on frequency selection.

[0050] PMI_1 402, PMI_2 404, PMI_3 406, and EC (1) 408, can be reported in a single ΤΠ, for example, TTI (l). PMI_4 410, PMI_5 412, PMI_6 414, and EC (2) 416, can be reported in a second TTI, for example, TTI (2). PMI_N-2 418, PMI_N-1 420, PMI_N 422 and EC (G) 424 can be reported in another ΤΊΊ, for example m (G).

[0051] If the error detection or verification mechanism is turned off or if the error verification and detection capability is removed, there will be no EC bit append. In this case, PMIs in group 1 (PMI_1 402, PMI_2 404, PMI_3 406) can be reported in ΤίΊ (1), PMI in group 2 (PMI_4 410, PMI_5 412, PMI_6 414) can be reported in ΤΊΊ (2), and Group G PMIs (PMI_N-2 418, PMI_N-1 420, PMI_N 422) can be reported in m (G). Reports can occur with or without the EC bits.

[0052] Figure 5 is a diagram of PMI feedback blocks with error checking and correction according to an alternative embodiment. The EC (1) 508 error checking bits are used for PMI_1 502, PMI_2 504, and PMI_3 506. The

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15/22 EC (2) 516 error checking bits are used for PMI_4 510, PMI_5 512, and PMI_6 514, and EC (G) error checking bits 528 are used for PMI_N-2 522, PMI_N-1 524 , and PMI_N 526. The PMI bits and the EC bits are encoded by the channel encoding function 540 before transmission.

[0053] In another alternative embodiment, PMIs can be separated into groups, and each group has an associated error checking and detection value. The verification of signaling and feedback error for each group is coded separately. The coded feedback bits and the EC bits can be transmitted in the same or different TTIs. Each PMI group, with its respective EC, is individually coded.

[0054] Figure 6 is a block diagram 600 of PMI feedback with error checking and correction according to another alternative embodiment. PMIs are divided into groups G for checking and / or correcting errors. EC (I) 620 is attached to PMI_1 602, PMI_2 604, and PMI_3 606, EC (2) 622 is attached to PMI_4 608, PMI_5 610 and PMI_6 612, and EC (N) 624 is attached to PMI_N-2 614, PMI_N -1 616 and PMI_N 618. PMI_1 602, PMI_2 604 and PMI_3 606 and EC (1) 620 are encoded by a first channel encoding function 630. PMI_4 612, PMI_5 614 and PMI_6 616, together with EC (2) 622 are encoded by a second encoding function of channels 640. PMI_N-2 614, PMI_N-I 616 and PMI_N 618, together with EC (G) 824 are encoded by a channel encoding function of chronological position G (G-th) 650. Methods of checking, detecting, and correcting errors can be chosen based on the number of bits that require coding. The EC can also use a single parity bit or check by bit parity blocks, which have a number of bits less than 16 bits. The EC can also use, for example, error checking and detection methods such as advanced parity checking.

[0055] The channel encoding functions 630, 640, 650 can use, for example, convolutive encoding or Reed-Solomon encoding. Other appropriate channel encodings, such as block encodings, turbo encodings, or LDPC encodings, can also be used.

[0056] The EC bits can be divided into several groups, each group of EC bits can be fed back or reported at the same time or at different times. Per

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16/22 example, each group of EC bits can be fed back or reported at the same time or in different TTIs. Each group is reported after joint or separate channel coding for each group.

[0057] Each PMI group can be reported in a different TTI or together in the same TTI. Each group is reported after separately encoding the channels of the groups. Also, other feedback signals, such as CQI, hierarchy, and ACK / NACK, for example, can be used.

[0058] PMI_1 602, PMI_2 604, PMI_3 606 and EC (1) 620 can be reported in TTI (l). PMI_4, PMI_5, PMI_6, and EC (2), can be reported in TTI (2), and PMI.N-2, PMI_N-1, PMI_N, and EC (G) can be reported in TTI, say, TTI (G ).

[0059] If the error detection or verification mechanism is turned off, or if the error detection or verification capacity is removed, there may be no attachment of EC bits. PMI groups can then be reported without EC bits. The PMI 1 group (PMI_1 402, PMI_2 404, PMI-3 406) can be reported in a TTI (l), and the PMI G group (PMI_N-2 418, PM_N-1 420, PMI_N 422) can be reported in a TTI (G). Each reported group can have separate channel encoding.

[0060] When the number of PMI groups is equal to the number of PMIs (G = N), then there will be a PMI for each group of PMIs. Each PMI can be attached with EC bits (for example, CRC) and encoded separately. Each PMI may be reported on different occasions. PMI_1 702, PMI_2 704, and PMI_N 706, can be reported in TTI (l), PMI_2 704 in ΤΊΊ (2), and PMI_N 706 in ΤΠ (Ν). Feedback or reporting can take place via a controller-type channel [eg, physical signal emission control channel (PUCCH)].

[0061] Alternatively, PMI_1 704, PMI_2 70, PMI_N 706 can be reported at the same time. For example, PMI_1 704 through PMI_N 706 can be reported on a single TTL. This can occur via the informational data type channel (eg, PUSCH), due to the ability of the informational data type channel (eg, PUSCH) to handle a larger number of bits. Other feedback signals, such as CQI, hierarchy, and ACK / NACK, for example, can be used with or without PMI.

[0062] Figure 7 shows a block diagram of PMI feedback with verification

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17/22 and error correction in accordance with yet another alternative embodiment. PMIs are divided into groups G for checking and detecting errors, with G = N. PMI_1 702 is attached to the error checking bits EC (1) 712, PMI_2 704 is attached to EC (2) 714, and PMI_N 706 is attached to EC (N) 716. Each PMI / EC pair is encoded by a 720 channel encoding function. Proper error checking, detection, and correction can be used, and may depend on the number of bits that require encoding. For example, a particular EC can use a CRC, for example, a 24-bit CRC, short CRC, a single parity bit, or parity check block bits. A channel encoding can use Reed-Solomon encoding, for example. Other appropriate error checks and detections, such as long CRC, or other parity check schemes, can be used. Other channel encodings, such as block encodings, convolution encodings, turbo encodings, or LDPC encodings, can also be used.

[0063] Given the use of selective frequency reports, PMI_1 702 can be reported in TTI (l), PMI_2 704, in ΤΊΊ (2), and PMI_N 706 in ΤΊΊ (Ν). These PMIs can be reported via a controller-type channel (for example, PUCCH). Alternatively, PMI_1 through PMI_N can be reported in a single ΤΊΊ via an informational type channel (eg, PUSCH). Other feedback signals, such as CQI, hierarchical, and ACK / NACK, for example, can be used.

[0064] Figure 8 shows a block diagram of PMI feedback with error checking and correction in accordance with yet another alternative embodiment. EC (I) 812 can be used for PMI_1 802, EC (2) 814 can be used for PMI_2 (804) and EC (N) [0065] 816 can be used for PMI_N (806). PMIs and ECs are encoded either separately or together in the 820 channel encoding function.

[0066] PMI_1 802 can be reported in TTI (I), PMI_2 804 can be reported in ΤΓΊ (2) and PMI (N) 806 can be reported in TTI (N). PMI_1 802, PMI_2 804, and PMI_N 806, can be separately coded and reported in different TTIs or in the same TTIs. Alternatively, PMI_1 802 PMI_2 804, and PMI_N 806, can be encoded together, separated, and reported in different Tlls. Furthermore, PMI_1 802, PMI_2 804, and PMI_N 806, can be coded together and reported on the same

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TTI. Alternatively, PMI_1 802, PMI_2 804 and PMI_N 806, can be coded separately with different protection schemes and reported in the same TTI. CQI, hierarchy, and ACK / NACK can also be used.

[0067] Figures 3 to 8 depict error checking, coding, and feedback for PMI, and feature a single type feedback signal. CQI and other types of feedback signals can be replaced by PMI.

[0068] Figures 9 to 12 depict error checking, coding, transmission, and feedback for more than one type of feedback signal. Figures 9 to 12 are discussed in detail below.

[0069] The PMI feedback and other types of control signaling can be checked for errors separately, with the same error check, or with a different error check, and then jointly coded. For example, a first type of feedback signal, which can be a PMI, can be attached with a first EC, which can be a CRC, such as a 24-bit CRC. A second type of feedback signal, which can be a CQI, can be attached with the same EC.

[0070] In another example, a first type of feedback signal, which can be a PMI, can be attached with an EC, which can be a CRC, such as a 24-bit CRC. A second type of feedback signal can be attached to a second EC, which can be a 16-bit CRC.

[0071] In general, different checks and error corrections can be used for different types of feedback signals, or for different feedback signals of the same type. Choosing which error checking and / or correction to use may involve a design decision between robustness versus overload. A longer CRC may provide more protection, but it will also create more bits. Therefore, if one type of feedback signal is more important than another type of feedback signal, a stronger error checking and / or correction capability can be provided for the most important type of feedback signal. Similarly for the feedback signal of the same type, if a feedback signal or group of feedback signals is more important than another feedback signal or group of feedback signals, an ability to check and / or correct errors more strong can be provided to the

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19/22 feedback signal or group of feedback signals that is most important.

[0072] Referring again to the examples above, if the first feedback signal, which can be a PMI, is more important than the second feedback signal, which can be a CQI, then a longer CRC with verification capabilities and error detection can be used for PMI, and shorter CRC with lower verification and error detection capabilities can be used for CQI.

[0073] The application of different error checking and correction capabilities to feedback signals can protect the feedback signal that is important, optimize the performance of the connection, and minimize signal overload.

[0074] Figure 9 is a 900 PMI feedback block diagram with error checking and correction, and with qualitative channel index (CQI) feedback with error checking and correction, according to yet another alternative embodiment. A first EC 930 (for example, CRC) is attached to PMI_1, 902 PMI_2 904, PMI_3 906 up to PMI_N 908. A second EC 940 (eg, CRC) is attached to CQI-1 912 up to CQIM 914. The PMI signal attached to the EC 910 and the CQI 920 signal are encoded together in the channel encoding function 950 to produce a single transmit signal.

[0075] In figure 9 the first EC 930 and the second EC 940 can be the same. This would provide equivalent protection and error checking for each feedback signal.

[0076] Alternatively, the first EC 930 and the second EC 940 may be different. If PMI feedback is more important to system performance than CQI feedback, the first EC 930 can be more robust. For example, the first EC can be a 24-bit CRC, and the second EC can be a 16-bit CRC.

[0077] The PMI feedback signals may consist of a broadband PMI, a narrowband PMI, a subband PMI, and / or a medium value PMI. Similarly, CQI feedback signals may consist of a broadband CQI, a narrowband CQI, a subband CQI, and / or an average value CQI. Also, similarly to embodiments that include a single feedback, as shown from figure 3 to figure 8, the EC bits and the feedback bits can be transmitted in a single TTI, or can be separated into multiple TTIs . More specifically, informational type data channels (eg PUSCH) can be used to

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20/22 transmit the feedback bits and the EC bits in a single TTI, as the informational type channel becomes capable of handling a larger number of bits per TTI.

[0078] Also, the encoding used for the feedback bits and the EC bits can be the same with the same weight, or the same with differentiated weight, or it can be different. A person skilled in the art will recognize that there are numerous possible combinations of coding, transmission, and error checking.

[0079] Figure 10 is a block diagram 1000 of PMI and CQI feedback according to yet another embodiment. The feedback signals can be attached together with error checking bits and encoded together. Signals that include PMI_1 1002 through PMI_N 1004 are inserted into an EC attach / insert function along with signals that include CQI_1 1012 through CQI_M 1014. The signals are processed by the EC 1020 function and a single output signal is inserted into a 1030 channel code before transmission.

[0080] Control signals other than CQI can also be used, including hierarchy and ACK / NACK.

[0081] Figure 11 is a 1100 block diagram of feedback with error correction and verification, CQI feedback with error verification and correction, and ACK / NACK feedback according to yet another embodiment. A first EC 1110 is attached to PMI_1 1102 up to PMI_N 1104. A second EC 1120 is attached from CQI_1 1112 to CQI_M 1114. Signal PMI 1106 and signal CQI 1116 are inserted into a channel coding function 1140 with an ACK / NACK 1130 signal.

[0082] The ACK / NACK 1130 feedback signal can be replaced with the hierarchy feedback signal in figure 12. Alternatively, a hierarchy feedback signal can be added to figure 12.

[0083] Figure 12 is a 1200 block diagram of PMI feedback and CQI feedback with ACK / NACK feedback, according to yet another embodiment. CQI, PMI and ACK / NACK can be coded together, but with errors checked separately. A PMI 1202 signal that includes PMI_1 1204 through PMI_N 1206, a CQI signal 1212 that includes CQI_1 1214 through CQI_M 1216, and an ACK / NACK 1220 signal are inserted into a function

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21/22 EC 1230 insertion / attachment. The output of the single signal is processed by a 1240 channel encoding function and transmitted. An EC (for example, CRC) is attached to the combined signal, prior to encoding and transmission.

[0084] The ACK / NACK 1220 feedback signal can be replaced with the hierarchy feedback signal in figure 12. Alternatively, the hierarchy feedback signal can be added to figure 12.

[0085] The PMI, CQI, and ACK / NACK signals can have different checks and error protections. For example, PMI may have the highest protection and / or error checking, while CQI may have the lowest protection and / or error checking. PMI, CQI, and ACK / NACK may have different protection and / or error checking, while using different error checking and / or coding schemes, or even using the same error checking and / or coding scheme. Different weights can be used for PMI, CQI, and ACK / NACK signals. The different protections and / or error checks can be performed by using different error checking and / or coding schemes, or by using the same error checking and / or coding schemes, although with different weights on different signals retrainformative type, through the use of uneven verification of errors and / or protection and coding schemes. This can apply to other feedback signals, such as hierarchies, for example.

[0086] Similarly, PMI feedback signals can consist of broadband PMI, narrowband PMI, subband PMI and / or medium value PMI. Similarly, CQI feedback signals can consist of broadband CQI, narrowband CQI, subband CQI and / or medium value CQI.

[0087] Although the attributes and elements are described above in certain specific combinations, each attribute or element can be used alone without the other attributes and elements, or in various combinations that include, or do not include, other attributes and elements. The methods or flowcharts provided herein can be implemented in a computer program, software, or firmware embedded in a computer-readable storage medium, to be executed by a general-purpose computer, or by a processor. Examples of means

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22/22 computer-readable storage includes read-only memory (ROM), random access memory (RAM), a register, cache memory, semiconductor memory devices, magnetic media such as internal hard drives and removable disks, magnetic media optical, and optical media such as CD-ROM discs, and DVD-ROM discs.

[0088] Suitable processors include, for example, a general purpose processor, a specific use processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors associated with a DSP core, a controller, a microcontroller, application-specific integrated circuits (ASICs), Field Programmable Gate Array circuits (FPGAs), or any other type of integrated circuit (IC), and / or electronic device in solid state.

[0089] A processor associated with software can be used to implement a radio frequency transceiver for use in a wireless transmission and reception unit (WTRU), user equipment (EU), terminal, base station, network controller broadcasting (RNC), or any host computer. The wireless transmission and reception unit (WTRU) can be used in conjunction with modules, implemented in hardware and / or software, such as a camera, a video camera module, a videophone, a speakerphone, a vibrating device, a loudspeaker, a microphone, a television transceiver, a pair of wireless headphones with a microphone, a computer keyboard, a Bluetooth® module, a radio frequency modulated (FM) unit, a liquid crystal display ( LCD), an organic light-emitting diode (OLED) display, a digital music player, a media player, an electronic video game console, an Internet browser, and / or any wireless local area network (WLAN), or ultra wide band module (UWB).

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