Method and apparatus for efficient precoding information validation for mimo communications

Third generation partnership projects 3GPP and 3GPP2 are considering long term evolution LTE for wireless interfaces and network architectures.

There is an ever-increasing demand for wireless operators to provide better quality voice and high-speed data services. As a result, there is an urgent need for wireless communication systems that enable higher data rates and higher capacities.

To achieve this, use multi-antenna systems within wireless communication networks to benefit from increased channel capacity, spectral efficiency, system throughput, peak data rates, and / or link reliability. Things are becoming more and more popular. Such multi-antenna systems, collectively referred to as multiple-input-multiple-output (MIMO) systems, have multiple-input-single-output (MISO) configurations and / or single-input-multiple-output (SIMO). It may also include a configuration.

Efficient signaling is essential for evolved universal terrestrial radio access (E-UTRA). Low overhead control signaling schemes can improve MIMO link performance, system capacity, system throughput, information data rate, and increased spectral efficiency.

MIMO systems have the potential for high spectral efficiency and have been proposed by a number of wireless communication standards. Numerous studies are also underway on the precoding of spatially multiplexed MIMO systems or space-time coded MIMO systems. Recording is a technique used to achieve increased array gain and / or diversity gain.

The recording information needs to be communicated from the transmitter (eg, the base station) to the receiver (eg, the radio transmit / receive unit (WTRU)) to avoid a channel mismatch between the transmit and receive signals. This is especially important for MIMO data demodulation when recording is used. Significant performance degradation can occur when the receiver uses an incorrect channel response for data detection.

In general, recording information can be communicated using explicit control signaling, especially when transmitters and receivers are restricted to using a limited set of antenna weights and coefficients for recording. A limited set of antenna weights and coefficients is sometimes referred to as a recording codebook. Explicit signaling for communicating recording information from a transmitter to a receiver can incur significant signaling overhead, especially for large codebooks. This signaling overhead is magnified manifold when frequency selective recording is used.

Precoding matrix or antenna weight validation and verification are used to avoid valid channel mismatches between transmitters and receivers. The effective channel between the base station and the mobile transmitter / receiver is the channel that experiences the MIMO recording effect, which is the channel matrix H and the involved node-B (eNodeB) or the recording matrix V used in the transmitter. It is a product. Mismatches in the effective channels between transmitters and receivers cause serious performance degradation of MIMO communication systems.

Figure 1A shows a signaling matrix or antenna weight signaling scheme. In the scheme shown in FIG. 1, the radio transmit / receive unit (WTRU) 111 feeds back the recording matrix index (PMI) or antenna weight to the base station or eNodeB 113. Suppose the WTRU feeds back PMI_j (with the Y bit) 115 to eNodeB. To inform the WTRU about the current pre-recording matrix used by the eNodeB, the eNodeB sends a validation message PMI_k (Y bit) 117 to the WTRU. In case of feedback error or override, PMI_j is not equal to PMI_k. If there are no feedback errors and no eNodeB overrides, then PMI_j = PMI_k. Validation messages can be sent in multiple forms, for example via control signaling or via reference signals.

In some systems, such as wideband code division multiple access (WCDMA®), there is only one PMI that needs to be signaled from the transmitter to the receiver and vice versa. The signal is spreading Sent in time domain using code). Signaling an exact single PMI (Y bit) to the receiver does not incur too much overhead as long as the value of Y is reasonable. However, in some systems, such as the Orthogonal Frequency Division Multiplexed OFDM System, where the frequency domain is additional to the time domain, it is fed back from the WTRU for validation to support frequency selective recording and transmitted from the eNodeB. There may be multiple PMIs that need to be done. Selectivity recording performs MIMO recording for each subband within the system bandwidth. The entire system bandwidth can be divided into multiple subbands. Each sub-band consists of one or more sub-carriers. One pre-recording matrix is used to pre-record the transmitted data for each sub-band. In extreme cases, recording can be performed on a subcarrier-by-subcarrier basis if the subband consists only of subcarriers. Signaling overhead can be high if multiple PMIs need to be signaled to the receiver (WTRU). For example, if there are Z PMIs to be signaled and each PMI has Y bits, the total overhead is Z × Y bits. If Z or Y itself is large, the signaling overhead is large.

The terminology for precoding matrices and precoding vectors is interchangeable and depends on the number of data streams to be prerecorded.

Each PMI is represented by an L bit, where the value of L depends on the MIMO configuration and the codebook size and number of data streams to be supported. The WTRU is allocated resources for communication. A resource block (RB) consists of M subcarriers, for example M can take a value (12). A resource block group (RBG) or subband consists of N resource blocks (N_RB), for example N_RB = 2, 4, 5, 6, 10, 25, or the entire bandwidth. System bandwidth can have one or more RBGs or subbands, depending on the size of the bandwidth and the value of N_RB per RBG. For example, the number of RBGs per system bandwidth, or N_RBG, can be 1, 2, 4, 10, 20, and 50. In general, the terms RBG and sub-bands are interchangeable.

The WTRU feeds back one PMI for each RBG configured for the WTRU or selected by the WTRU for reporting. Among the N_RBG RBGs of a given bandwidth, there are N RBGs, where "N N_RBG" can be configured for WTRU or selected by WTRU. If "N" RBGs are configured for WTRU or selected by WTRU to report recording information, WTRU feeds back "N" PMIs to eNodeB. eNodeB sends back a pre-recording validation message containing "N" PMIs to the WTRU.

To inform the WTRU about the current PMI used by the eNodeB, the eNodeB sends back "N" PMIs to the WTRU. The total number of bits that eNodeB sends to the WTRU per PMI validation message is "N_PMI x N" bits.

Table 1A shows the number of bits in the PMI validation message assuming N_PMI = 5 bits. The numbers are summarized for system bandwidths of 5MHz, 10MHz, and 20MHz. The second line is N_RB, the number of RBs per RBG. For example, N_RB ranges from 2 to 100 for 20MHz. The third line is N_RBG per system bandwidth, that is, the number of RBGs per system bandwidth of 5MHz, 10MHz, and 20MHz, with values of N_RBG ranging from 1 to 50. The fourth line is the total number of bits of PMI validation signaling per validation message or grant channel.

<tables num="1"><img id="000002" he="104" wi="146" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

This precoding matrix (s) or antenna weight validation (hereinafter referred to as "precoding information validation" or "PMI validation") is valid. It may require up to 250 bits or more bits per sex test message. Therefore, this method is inefficient.

<p num="0018"> Therefore, it is desirable to provide methods and devices that reduce the signaling overhead of PMI validation.</p>

<p num="0019"> Provided are an efficient method and apparatus for validating recording information in MIMO wireless communication.</p><p num="0020"> The radio transmit / receive unit WTRU sends one or more recording information or recording matrix indexes (PMIs) to eNodeB. In response, the WTRU receives a validation message (PMI indicator) from eNodeB that includes a pre-recording confirmation message indicating whether there is a match with the pre-recording information reported by the WTRU. If there is a match between the pre-recording information, that is, the pre-recording information is the same, make sure that the pre-recording information used by eNodeB is the same as the pre-recording information fed back from WTRU. A pre-recording validation message, including the message, is received by the WTRU from eNodeB. However, if there is a discrepancy or the pre-recording information fed back from the WTRU is overridden by the eNodeB, the WTRU indicates that the eNodeB does not use the pre-recording information fed back from the WTRU. -Receive a validation message including the message from eNodeB. The WTRU can also receive validation messages from eNodeB, including pre-recording indication messages indicating the pre-recording information being used by eNodeB. Pre-recording validation using pre-recording confirmation messages is used to reduce signaling overhead.</p><p num="0021"> eNodeB sends a recording confirmation message to WTRU. This recording confirmation message can be carried by a PMI indicator that indicates the status of the downlink DL recording validation. The PMI indicator can be a one-bit or bit sequence representing the pre-recording validation state or one or more pre-recording information states for the pre-recording validation corresponding to the WTRU pre-recording feedback.</p><p num="0022"> A validation message or PMI indicator that uses pre-recording confirmation can consist of one or more bits. The use of PMI indicators that use either a single bit or more bits helps to indicate recording information and status, thus helping to reduce overhead and increase efficiency.</p><p num="0023"> A more detailed understanding of the invention can be obtained from the following description of preferred embodiments, which are given by way of example and should be understood with the accompanying drawings.</p>

<figref num="1A">It is a figure which shows the signaling system of a recording matrix or an antenna weight.</figref><figref num="1B">FIG. 3 is a block diagram of an example showing a transmitter and receiver configured to perform recording matrix transmission.</figref><figref num="2">It is a figure which shows the 1st Embodiment of a signaling scheme (a single PMI validation about a single PMI feedback).</figref><figref num="3A">It is a figure which shows the 2nd Embodiment of the signaling method (multiple PMI validation about multiple PMI feedback) about pre-recording matrix verification or antenna weight verification.</figref><figref num="3B">FIG. 5 illustrates another embodiment of a single PMI validation signaling scheme for multiple PMI feedback.</figref><figref num="4">It is a figure which shows the PMI validation message system.</figref><figref num="5">It is a figure which shows the PMI validation message system.</figref><figref num="6">It is a figure which shows the PMI validation message system.</figref><figref num="7">It is a figure which shows the PMI validation message system.</figref><figref num="8">It is a figure which shows the PMI validation message system.</figref><figref num="9">It is a figure which shows the control signaling system which attached PMI validation signaling.</figref><figref num="10">It is a figure which shows the control signaling system which inserted PMI validation signaling.</figref><figref num="11">It is a figure which shows the wireless communication system which has a plurality of NodeBs communicating with various WTRUs.</figref>

When referred to below, the term "WTRU" is used for wireless transmitter / receiver units (WTRUs), mobile stations, fixed or mobile subscriber units, pagers, cell phones, personal digital assistants (PDAs), computers, or wireless. Includes, but is not limited to, any other type of user device that can operate in the environment. As referred to below, the term "eNodeB" includes Node-Bs, base stations, site controllers, access points (APs), or any other type of interfacing device that can operate in a wireless environment. Not limited to.

The term "PMI indicator" is used to refer to an indicator that responds to a feedback signal in or corresponding to a validation state such as antenna weight, PMI, beamforming weight. A "PMI indicator" can carry pre-recording confirmation messages, pre-recording indication messages, other pre-recording related messages, or a combination thereof, depending on various designs, methods, and purposes. .. The pre-recording indication message can be a pre-recording information indication message, a rank override message, a feedback error message, or the like, depending on the state of the pre-recording validation. Recording information Indication messages, rank override messages, and the like can indicate rank information or other recording-related information.

The methods described below provide efficient antenna weighting, beamforming or pre-recording information, or pre-recording matrix display PMI signaling and validation methods for E-UTRA.

FIG. 1B is a functional block diagram of transmitter 110 and receiver 120 configured to perform the recording matrix display method described below. In addition to the components contained in a normal transmitter / receiver, the transmitter 110 includes a pre-recording information determiner 114, a pre-recording processor 116, an antenna array 118, and a pre-recording confirmation message block 132. And includes a recording validation message generator 136 consisting of a recording indication message block 134. The pre-recording information determiner 114 coupled to the pre-recording processor 116 is RX. Used to determine pre-recording information based on pre-recording feedback received from 120 pre-recording information generators 124. The output of the pre-recording information determiner 114 is used by the pre-recording processor 116 and the transmitter 110 when transmitting data, for example, an orthogonal frequency division multiplexing (OFDM) symbol to the receiver 120. The pre-recording validation message generator 136 coupled to the pre-recording information verdict 114 is used to generate a validation message based on the output of the pre-recording information verdict 114. The pre-recording validation message generator 136 uses the pre-recording feedback signal received from the pre-recording information generator 124 and the pre-recording information generated from the pre-recording information determiner 114 to perform pre-recording validity. Determine the status of the check and generate the corresponding validation message. For example, if there is a match between the pre-recording information generated by the pre-recording information determiner 114 and the pre-recording information generated by the pre-recording information generator 124, a validation message containing a pre-recording confirmation message will be displayed. It is sent, otherwise a validation message is sent, including a pre-recording indication message.

The receiver 120 includes a receiver 128, a recording information generator 124, a channel estimator 130, a demodulator / processor 126, and a recording validation message-recording information converter 138. As disclosed in more detail below, receiver 120, including receiver 128, receives the transmitted OFDM block from transmitter 110, performs channel estimation by channel estimator 130, and then antenna 127. The pre-recording information generator 124 is used to generate the pre-recording information to generate the pre-recording feedback signal transmitted via. The receiver 120 also receives the pre-recording validation message from the pre-recording validation message generator 136 of the transmitter 110, detects and decodes this pre-recording validation message, and this pre-recording validation. Convert the message into pre-recording validation message-pre-recording information converter 138. Recording validation message-Precoding information at the output of the recording information converter 138 is supplied to the demodulator / processor 126 for MIMO data detection, decoding, and processing.

The eNodeB includes the transmitter 110 and the WTRU 20 includes the receiver 120. Note that the transmitter 110 can be located at the WTRU and / or base station, and the receiver 120 can be located at the WTRU and / or base station.

Validation messages or PMI indicators that use pre-recording confirmation can consist of a single bit. For example, the pre-recording confirmation or PMI indicator can be (1) a pre-recording confirmation message telling the WTRU that the pre-recording information used by the eNodeB is exactly the same as the pre-recording information fed back from the WTRU, or (2). Pre-recording indication message indicating that the pre-recording information used by eNodeB is not the same as the pre-recording information fed back from WTRU (this indicates that different pre-recording information is used by eNodeB). As, a single bit can be used to carry two possible validation messages.

The recording validation message or PMI indicator can also consist of multiple bits. The pre-recording validation message can carry one pre-recording confirmation message and multiple pre-recording indication messages. For example, a pre-recording validation message or PMI indicator may (1) inform the WTRU that the pre-recording information used by eNodeB is exactly the same as the pre-recording information fed back from the WTRU. (2) Multiple possible recordings that inform WTRU that the recording information used by eNodeB is not the same as the recording information fed back from WTRU, and indicate which recording information is used by eNodeB. As one of the recording indication messages, multiple bits can be used to carry multiple possible messages.

The pre-recording indication message may indicate the type of pre-recording information used if the WTRU pre-recording feedback has errors or is unreliable, or if the WTRU pre-recording feedback is overridden by eNodeB. it can. In addition, the pre-recording indication message can indicate which subset of the pre-recording information will be used if the WTRU rank information in that pre-recording feedback is overridden by eNodeB.

The recording information or PMI can include all information about MIMO recording, including rank information.

The method described reduces the PMI validation overhead by using an efficient validation message consisting of confirmation messages regarding WTRU pre-recording feedback. The validation message can also include an indication message. As an example, a qubit validation message or PMI indicator is used. Q can be 1 or greater for all PMI indicators. For example, if the validation message is either one confirmation message or one indication message, Q = 1 bits is sufficient. Q&gt; 1 bit can be used if the validation message is either one confirmation message or one of multiple indication messages.

The confirmation and indication messages can either be coded or coded separately, or jointly coded or coded. In the case of separate coding or coding schemes, the validation message has two parts: a confirmation part and an indication part. It can consist of part). The confirmation part typically uses 1 bit to carry a positive or negative confirmation message. The indication part typically uses one or more bits to carry multiple indication messages. In the confirmation message, the affirmative confirmation message is used to inform the WTRU that the pre-recording information used by the eNodeB is exactly the same as the pre-recording information fed back from the WTRU. On the other hand, the negative confirmation message is used to inform the WTRU that the pre-recording information used by the eNodeB is not the same as the pre-recording information fed back from the WTRU. This indicates to the WTRU that different pre-recording information is being used in the eNodeB. The type of recording information used by eNodeB is indicated in the indication part of the validation message. The indication part of the validation message points out the pre-recording information used by eNodeB.

Separate coding message formats with confirmation and indication parts or confirmation and display fields are shown as follows:

<tables num="2"><img id="000003" he="15" wi="140" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

In a joint coding or joint coding scheme, the validation message can consist of only one part that combines a congruently encoded confirmation message and an indication message. Each of the validation messages can carry either one confirmation message (affirmation message) or one of several possible indication messages. The confirmation message (affirmative confirmation message) is used to inform the WTRU that the pre-recording information used by the eNodeB is exactly the same as the pre-recording information fed back from the WTRU. Indication messages in joint coding serve two purposes at the same time: negative confirmation and programming indication. That is, the indication message is used to inform the WTRU that the pre-recording information used by eNodeB is not the same as the pre-recording information fed back from WTRU, and also the pre-recording information used by eNodeB. Shown. A joint coding message format with a single combined verification / indication part or field for a validation message is shown as follows:

<tables num="3"><img id="000004" he="15" wi="140" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

The separate coding or coding of the confirmation message and the indication message is simple. Therefore, it is also more efficient most of the time when only a confirmation message or one bit needs to be sent. However, the receiver must distinguish between the "confirmation message" and the "confirmation + indication message" because they have different lengths. This increases the detection complexity of the receiver. To avoid different length issues between "confirmation message" and "confirmation + indication message", use the same format regardless of whether the eNodeB and WTRU recording information is the same or not. Can be used. For example, the same format as "confirmation + indication message" can be used by "confirmation message" which has only confirmation message. In addition, for multiple subband recordings, it is possible to send only one confirmation message and one indication message instead of sending one confirmation message and multiple indication messages. The method of using only one confirmation message and one indication message has only one indication message corresponding to the single pre-recording information or pre-recording matrix used by eNodeB for all subbands. Since it is transmitted, it is a wideband recording or a non-frequency selective recording. The method of using one confirmation message and multiple indication messages uses multiple pre-recording information or pre-recording matrices for multiple sub-bands, and each pre-recording information or pre-recording matrix is one sub-band. Is used for multi-band pre-recording or frequency-selective pre-recording. Same format for both confirmation-only messages and confirmation and indication messages By using non-frequency selective recording when the recording information used by the eNodeB and the recording information fed back from the WTRU are not the same, the detection complexity at the receiver is Reduced or avoided. When the pre-recording information used by eNodeB and the pre-recording information fed back from WTRU are the same, multi-band pre-recording or frequency selective pre-recording is used.

Joint coding can combine confirmation and indication messages, saving more bits per validation message. However, every validation message sent contains both a confirmation message and an indication message, and therefore there is a certain number of bits sent consistently within the validation message. Overall efficiency may be lower for joint coding compared to separate coding, but joint coding may not increase the detection complexity of the receiver. The use of confirmation and indication messages in response to pre-recording feedback using either separate or joint coding or coding methods for pre-recording information provides higher efficiency than the simple method. This is because the simple method uses a very large number of bits.

As another example, for Q = 2 bits, which uses separate coding for the confirmation message and the indication message, the validation part of the validation message can use 1 bit, and the validation of the validation message. Other bits can be used for the programming part. The confirmation part of the validation message with bits 0 can represent a positive confirmation message, bit 1 can represent a negative confirmation message, and the indication part of the validation message with bits 0 and 1 , Each can represent an indication message 1 and an indication message 2 that can indicate the pre-recording information 1 and the pre-recording information 2, respectively.

For Q = 2 bits using joint coding for confirmation and indication messages, a validation message with bit sequence 00 can represent a confirmation message (affirmation message), bit sequences 01, 10, Validation messages having and 11 can correspond to pre-recording information 1, pre-recording information 2, and pre-recording information 3, respectively, and can indicate an indication message 1, an indication message 2, and an indication, respectively. -Can represent message 3. Validation messages with bit sequences 01, 10, and 11 automatically represent a negative confirmation message due to the joint coding or joint coding of the confirmation and indication messages.

Similarly, with respect to Q = 3 bits when using separate coding for the confirmation message and the indication message, the validation part of the validation message can use 1 bit, and the validation of the validation message. The part can use 2 bits. The confirmation part of the validation message with bit 0 can represent a positive confirmation message, bit 1 can represent a negative confirmation message, and the indication part of the validation message with bits 00-11 , Each of which can represent the indication message numbers 1 to 4, which correspond to the pre-recording information numbers 1 to 4.

Similarly, with respect to Q = 3 bits when using joint coding or joint coding of confirmation and indication messages, a validation message with bit sequence 000 can represent a positive confirmation message and bits. The validation messages having sequences 001 to 111 can represent negative confirmation messages and at the same time can represent indication message numbers 1 to 7, respectively, which are from recording information number 1 to 7, respectively. Indicates the pre-recording information number 7.

The indication message can indicate pre-recording information. In addition, the indication message can also indicate a subset of pre-recording information, pre-recording rules, override rules, and so on. For example, an indication message uses which pre-recording information or pre-recording matrix (which can also include rank information) and how eNodeB overrides it (for example, pre-recording feedback). Which pre-recording information or pre-recording matrix should be used when the rank of the WTRU in is overridden, and how eNodeB handles any errors in the WTRU feedback (for example, valid). Use some previously used pre-recording information). Depending on what the information is presented to, the indication message may be a different type of message, such as a recording information indication type message, a recording or rank override message, a feedback error message, and so on. Can have. Therefore, the validation message can have multiple types of messages. A validation message with two types of messages, a confirmation message and an indication message, is summarized in Table 1B.

<tables num="4"><img id="000005" he="35" wi="159" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

Table 1C summarizes the validation messages with four types of messages: confirmation messages, indication messages, override messages, and feedback error messages.

<tables num="5"><img id="000006" he="65" wi="159" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

The usage described above is applicable to all MIMO radio communication systems and is applicable to uplink UL and downlink DL. The term "PMI indicator" is used to refer to an indicator that responds to a feedback signal in or corresponding to a validation state such as antenna weight, PMI, beamforming weight.

Generally, one confirmation message, M1 indication message (indicating different recording information), M2 override message (indicating different override rules for recording), and M3 feedback error messages. There can be (showing different recording rules for handling feedback errors). The total number of bits to represent the validation message is log₂(1 + M1 + M2 + M3).

Joint coding can be performed for programming confirmation messages, programming information messages, or indication messages that may or may not contain rank information for different designs and purposes. In addition, when override messages, feedback error messages, or other MIMO-related information and messages are used, joint coding may be applied to rank override messages, feedback error messages, or other MIMO-related information. It can also be run for information and messages.

An embodiment of the above scheme using either a single bit or more bits is described as follows. Only the PMI indicator is received by the WTRU when there is a match between the PMIs, i.e. the PMIs are the same. Alternatively, the PMI indicator can be received by the WTRU along with the eNodeB PMI. However, if there is a discrepancy or the WTRU's PMI is overridden, the WTRU will receive a PMI indicator along with the eNodeB's PMI. In this example, the PMI indicator is the recording confirmation field and the PMI is the recording indication field.

Multiple PMIs can be sent at the same time, and PMIs can be divided into multiple groups.

FIG. 2 shows a signaling scheme according to another embodiment of the method described below. The WTRU or receiver 211 sends the PMI or antenna weights to the eNodeB or transmitter 213, as represented as PMI_j (with Y bits) 215. To inform the WTRU or receiver about the recording matrix or antenna weight currently in use by the eNodeB, the eNodeB sends a validation message to the WTRU or receiver, as represented as PMI_k (Y bit) 217. Send back. When eNodeB and WTRU use the same recording matrix or antenna weights, the eNodeB does not transmit the entire PMI or antenna weight bits, but rather a PMI indicator indicating that the recording matrix or antenna weights are the same. Send only PMI_IND (1 bit) 217. Feedback errors are usually low, typically 1%. Most of the time, eNodeB and WTRU use the same recording matrix or antenna weights. Therefore, in most cases, a 1-bit PMI indicator (affirmative or negative confirmation message) is sent.

This signaling scheme significantly reduces the signaling overhead and is summarized as follows: If the PMI indicator or PMI or antenna weight indicator is set to 1, this indicates a negative confirmation message, indicating that the PMI or antenna weights used by eNodeB and WTRU are not the same. This usually happens in the case of a feedback error or when eNodeB overrides WTRU's feedback.

When the PMI indicator or PMI or antenna weight indicator is set to 0, this indicates a positive confirmation message, indicating that the PMI or antenna weights used by eNodeB and WTRU are identical. This usually happens when there are no feedback errors and the eNodeB does not override the WTRU feedback. This method is summarized in Tables 2A and 2B. The PMI indicator is represented by PMI_IND.

<tables num="6"><img id="000007" he="52" wi="159" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

<tables num="7"><img id="000008" he="56" wi="158" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

PMI indicators can also be used to indicate one or more beamforming matrices or vectors, antenna weights, and any other matrix, vector, or weight when applicable. Other notations for PMI indicators other than PMI_IND can also be used. The bit assignment of PMI_IND above is optional and any other value other than "1" and "0" can be used for the PMI indicator.

FIG. 3A shows a signaling scheme for pre-recording matrix validation or antenna weight validation according to another embodiment. This embodiment relates to efficient signaling for multiple PMI validation or validation. This embodiment relates to the case of a frequency selective channel. For example, if you have multiple PMIs to be reported for the entire bandwidth, you can split the entire system bandwidth into multiple subbands (or RBGs) and one PMI to be reported for each subband. it can. In this embodiment, there can be N PMIs for reporting. The WTRU or receiver 311 sends the recording matrix index or antenna weight information 315, represented as PMI_j1, PMI_j2, ..., PMI_jN, to the eNodeB or transmitter 313. WTRU for recording matrix or antenna weights currently used in eNodeB 313 To inform 311 the eNodeB sends back to the WTRU a validation message 317, represented as PMI_k1, PMI_k2, ..., PMI_kN, corresponding to the pre-recording feedback PMI_j1, PMI_j2, ..., PMI_jN, respectively. When eNodeB 313 and WTRU 311 use the same pre-recording matrix or the same set of antenna weights for all subbands (ie PMI_j1 = PMI_k1, PMI_j2 = PMI_k2, ..., PMI_jN = PMI_kN) Rather than sending all PMIs or all sets of antenna weight bits back to the WTRU 311 the 313 sends only a PMI indicator (1 bit) indicating that the PMIs are identical. Feedback errors are usually low, typically 1% for design requirements. In most cases, eNodeB 313 and WTRU The 311 uses the same recording matrix or antenna weights. If there are no feedback errors and no overrides, eNodeB or TX will only send PMI_IND to WTRU or RX. In case of feedback error or pre-recording override or rank override, eNodeB or TX sends PMI_IND and pre-recording information to WTRU. Depending on whether frequency selective recording is used, the eNodeB or TX sends different amounts of recording information to the WTRU. For example, if frequency selective recording is used with eNodeB or TX, eNodeB or TX will send PMI_IND and PMI_k1, PMI_k2, ..., PMI_kN to WTRU or RX, where PMI_k1, PMI_k2 ,. .., PMI_kN represents N sub-bands or N pre-recording matrices of RBG. When non-frequency selective recording is used with eNodeB or TX, eNodeB or TX sends PMI_IND and a single recording information, eg PMI_m, where PMI_m is all subbands or RBGs. The recording matrix used for. That is, the same pre-recording matrix is used for all sub-bands or RBGs. This method is summarized in Tables 3 and 4, respectively.

<tables num="8"><img id="000009" he="47" wi="153" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

<tables num="9"><img id="000010" he="63" wi="158" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

FIG. 3B shows a signaling method for validation of pre-recording matrix or antenna weights according to another embodiment. This embodiment relates to efficient signaling between multiple PMI feedbacks and a validation message containing a single recording indication message. The WTRU or receiver 311 sends the recording matrix index or antenna weight information 316, represented as PMI_j1, PMI_j2, ..., PMI_jN, to eNodeB or transmitter 313. To inform WTRU 311 about the pre-recording matrix or antenna weight currently used by eNodeB 313, eNodeB is represented as PMI_IND + PMI_k in response to pre-recording feedback PMI_j1, PMI_j2, ..., PMI_jN. Send inspection message 318 back to WTRU. This is used when there is multiple PMI feedback and a validation message with a single PMI indication message is used.

When the eNodeB 313 and WTRU 311 use the same recording matrix or the same set of antenna weights, the eNodeB 313 does not send all PMIs or all sets of antenna weight bits back to the WTRU 311. Send a confirmation message indicating that is the same. Otherwise, eNodeB 313 sends an indication message to WTRU 311 indicating that the PMIs are not identical. When separate coding is used, PMI_IND and PMI are sent, where PMI_IND supplies a positive or negative confirmation message and the PMI acts as an indication message. In this case, PMI_IND is 1 bit and PMI is at least 1 bit. When a joint coding PMI_IND containing a PMI is sent, the PMI_IND acts as both an affirmative or negative confirmation message and an indication message. In this case, PMI_IND is at least 1 bit.

A validation message format with two fields can be shown as follows:

<tables num="10"><img id="000011" he="15" wi="140" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

In addition, for validation messages that use joint coding of confirmation and indication messages, the validation message format with a single field can be shown as follows:

<tables num="11"><img id="000012" he="15" wi="140" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

In validation message format 2, a single PMI_IND field contains a combination of PMI_IND and PMI in validation message format 1.

Another embodiment is by using a default recording message rather than sending an indication message or PMI. Signaling uses the same pre-recording information that eNodeB or TX sends a PMI_IND (affirmation message) to the WTRU or RX in the absence of feedback errors and overrides, and the eNodeB feeds back from the WTRU. You can do it in another way, such as confirming that you do. In case of feedback error or PMI override, eNodeB or TX sends a PMI_IND (Negative Confirmation Message) to the WTRU, where PMI_IND is the default or pre-determined recording indication message or information. Tell WTRU to use. Therefore, only the PMI_IND containing the confirmation message will be sent, while the indication message or PMI (s) will not be sent in any case. This method is summarized in Table 5.

<tables num="12"><img id="000013" he="38" wi="158" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

PMI indicators can also be used to indicate one or more beamforming matrices or vectors, antenna weights, and any other matrix, vector, or weight when applicable. Other notations for PMI indicators other than PMI_IND can also be used. The confirmation state of PMI_IND as affirmative and negative is optional, and any other value other than affirmative and negative can be used for the PMI indicator.

As mentioned earlier, the signaling overhead for PMI validation or validation can be up to 250 bits per validation signaling for multiple RBGs and multiple PMIs each time a PMI validation message is sent. May require more. Therefore, a signaling scheme that uses the described pre-recording confirmation message saves a considerable amount of signaling overhead.

The downlink PMI indicator signaling scheme according to another embodiment is summarized as follows. When PMI_IND (PMI or antenna weight indicator) is set to 1, this indicates a negative confirmation message and that at least one of the multiple PMIs used by eNodeB 313 and WTRU 311 is not identical. Shown. This usually happens in the case of a feedback error or when the eNodeB 313 overrides the feedback on the WTRU 311. All PMIs are sent following PMI_IND (1 bit) as shown in Figure 4. In Figure 4, the first element is PMI_IND 411, followed by the individual PMIs 413 (a) to 413 (n).

When PMI_IND (PMI or antenna weight indicator) is set to 0, this indicates a positive confirmation message, indicating that all PMIs used by eNodeB 313 and WTRU 311 are identical. This usually happens when there are no feedback errors and the eNodeB 313 does not override the WTRU 311 feedback. Only PMI_IND (1 bit) 411 is sent, not PMI.

According to another embodiment, the PMI is divided into groups, eg G groups. As shown in Figure 5, each group has one bit to indicate if the recording matrix or antenna weights are the same for the eNodeB 313 and WTRU 311. Such signaling can be implemented to have either Q bits within one indicator signaling or Q PMI indicators, each having 1 bit. The PMI indicators PMI_IND (1) 511, PMI_IND (2) 513, ..., and PMI_IND (G) 51g can be distributed across validation messages as shown in Figure 5.

An alternative mode of grouping can be seen in Figure 6, where the PMI indicators (611, 613, and 61g) PMI_IND (1), PMI_IND (2), ..., and PMI_IND (G) are shown in Figure 6. Can be grouped within the preceding part of the validation message as shown in.

The signaling mechanism by the PMI indicators (PMI_IND (g), g = 1, 2, ..., G) for group PMI is summarized as follows. When the PMI_IND (PMI or antenna weight indicator) of a group of WTRUs is set to 1, this indicates a negative confirmation message and is one of the PMIs belonging to that group used by eNodeB 313 and WTRU 311. Indicates that at least one is not the same. This usually happens in the case of a feedback error or when eNodeB overrides WTRU's feedback for that PMI group. In the case of PMI_IND (g) = '1', that is, the negative confirmation message of the gth group, all PMIs belonging to the gth group are sent following the PMI_IND (g) set in '1'. For example, in Figure 5, if any of PMI_1, PMI_2, and PMI_3 are not the same for eNodeB and WTRU, then PMI_IND (1) and PMI_1, PMI_2, and PMI_3 are transmitted by eNodeB.

When the PMI_IND or PMI or antenna weight indicator for a group of WTRUs is set to 0, this indicates a positive confirmation message and all PMIs belonging to that group used by eNodeB and WTRU are identical. Is shown. This usually happens when there are no feedback errors or the eNodeB does not override the WTRU feedback. In the case of PMI_IND (g) = '0', that is, the affirmative confirmation message of the gth group, only the PMI indicator of the gth group is sent instead of the PMI belonging to the gth group. The transmitted PMI_IND (g) is set to '0'. For example, in Figure 5, if PMI_4, PMI_5, and PMI_6 are all the same for eNodeB and WTRU, then only 1-bit PMI_IND (2) is sent by eNodeB. In the alternative, the fields reserved for PMIs that are not sent can be used to send other information or data. This increases the throughput and spectral efficiency of information or data. For example, the fields reserved for PMI_4, PMI_5, and PMI_6 can be used to send other information or data.

A special case for group PMI indicator signaling is when each group has only one PMI, i.e. G = N. In this embodiment, each group has exactly one PMI. This method is shown in FIG. Increases within group (G) can increase signaling efficiency because only a small number of non-identical PMIs need to be signaled.

In general, PMI_IND can represent a message or state consisting of a bit sequence. For example, PMI_IND can represent a recording confirmation message or state, a recording information message 1 or state 1, a recording information message 2, or a state 2, and so on. This method is summarized in Table 6A. A similar method for the override method is shown in Table 6B.

<tables num="13"><img id="000014" he="78" wi="154" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

<tables num="14"><img id="000015" he="70" wi="159" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

As an example, a codebook (1) using the above method has four pre-recording vectors of rank 1 and two pre-recording matrices of rank 2. The codebook (1) shown in Table 7 has a total of 6 recording matrices / vectors.

<tables num="15"><img id="000016" he="36" wi="143" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

The corresponding PMI confirmation and indication methods for Codebook 1 when ranks are shown jointly can be found in Table 8A.

<tables num="16"><img id="000017" he="91" wi="158" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

Table 8B shows another method for codebooks (1) that uses the above method when ranks are shown congruently and rank overrides are shown, namely the corresponding PMI verification and indication methods for rank 1. be able to.

<tables num="17"><img id="000018" he="107" wi="158" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

PMI_IND = 111, used in Table 9, indicates that eNodeB informs WTRU to use a subset of the higher-ranked pre-recording matrices. For example, a rank 2 pre-recording matrix consists of two column vectors, and a rank 1 pre-recording matrix is a pre-recording vector. When rank information is overridden from rank 2 to rank 1, it can indicate that either the first or second column vector of the rank 2 matrix must be used.

Another method in Codebook (1) that uses the above method when ranks are shown separately, namely the corresponding PMI confirmation and indication method table for rank 1, shall be as shown in Table 9A. Can be done.

<tables num="18"><img id="000019" he="101" wi="158" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

For Rank 2 corresponding to Codebook (1), the PMI confirmation and indication method table when the ranks are shown separately can be as shown in Table 9B.

<tables num="19"><img id="000020" he="69" wi="158" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

As an example, the codebook (2) has 16 pre-recording vectors of rank 1 and 16 pre-recording matrices of ranks 2, 3, and 4. Codebook 2 has a total of 64 recording matrices / vectors, as shown in Table 10. The rank 1 pre-recording matrix is a column vector. Rank 1 pre-recording matrices are C1 to C16. The rank 2 pre-recording matrix is a matrix consisting of two column vectors, and the rank 2 pre-recording matrix is C17 to C32. The rank 3 pre-recording matrix is a matrix consisting of three column vectors, and the rank 3 pre-recording matrix is C33 to C48. The rank 4 pre-recording matrix is a matrix consisting of four column vectors, and the rank 4 pre-recording matrix is C49 to C64. The lower-ranked pre-recording matrix is a subset of the higher-ranked pre-recording matrix. For example, C1 is a subset of C17, this C17 is a subset of C33, and this C33 is a subset of C49.

<tables num="20"><img id="000021" he="145" wi="90" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

The corresponding table of PMI confirmation and indication methods in Codebook (2) can be as shown in Table 11A.

<tables num="21"><img id="000022" he="85" wi="158" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

The corresponding table of PMI confirmation and indication methods with rank overrides in Codebook (2) may be as shown in Table 11B.

<tables num="22"><img id="000023" he="183" wi="159" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

One of the recording matrices can be removed from the codebook (2) to save signaling overhead. As an example, if C64 or one of the other matrices is removed, this method is reduced to the method shown in Table 11C.

<tables num="23"><img id="000024" he="52" wi="153" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

When each group has only one PMI (PMI or antenna weight indicator) and PMI_IND is set at (n) = 1, this is because the nth PMI used by eNodeB and WTRU is not the same. Indicates that there is no such thing. This usually happens in the case of a feedback error or when eNodeB overrides WTRU's feedback. The nth PMI is sent. For example, in Figure 8, PMI_IND (n) and PMI_n are sent by eNodeB when PMI_n is not the same for eNodeB and WTRU. This increases signaling efficiency.

When each group has only one PMI or PMI or antenna weight indicator and PMI_IND is set at n = 0, this means that the nth PMI used by eNodeB and WTRU is the same. Shown. This usually happens when there are no feedback errors and the eNodeB does not override the WTRU feedback. Instead of sending the nth PMI, only the PMI_IND or PMI_IND (n) of the nth PMI is sent. For example, in Figure 8, if PMI_n is the same for eNodeB and WTRU, then only 1-bit PMI_IND (n) is sent by eNodeB.

PMI indicators can be attached to or embed in and transmitted along with existing control signaling. Figure 9 shows that PMI validation signaling is attached to control signaling. Figure 10 shows that PMI validation signaling is inserted into control signaling. Instead, the PMI indicator can be transmitted using separate signaling or stand-alone signaling.

PMI validation messages can be signaled to the WTRU via control signaling or dedicated reference signal (RS). Instead, part of the validation message can be sent via control signaling and part of the validation message can be sent via a dedicated reference signal. For example, the recording confirmation portion can be transmitted via control signaling and the recording indication portion can be transmitted via a dedicated reference signal. Both PMI indicator signaling can be applied to control signaling or dedicated reference signals and used to reduce the amount of control signaling overhead or dedicated RS overhead. When a dedicated reference signal is used to send a PMI validation message, multiple forms of the dedicated reference signal can be used, such as a pre-recorded pilot. The use of PMI indicators to reduce dedicated RS is explained as follows:

New downlink PMI indicator signaling for dedicated reference signals

When PMI_IND is set to 1 (negative confirmation message), this indicates that at least one of the PMIs used by eNodeB and WTRU is not the same. This usually happens in the case of a feedback error or when eNodeB overrides WTRU's feedback. All dedicated reference signals carrying the PMI are transmitted by the eNodeB. PMI_IND is set to '1' and is also sent by eNodeB.

When PMI_IND is set to 0 (affirmation message), this indicates that all of the PMIs used by eNodeB and WTRU are identical. This usually happens when there are no feedback errors and the eNodeB does not override the WTRU feedback. Not all dedicated reference signals carrying PMI are transmitted by eNodeB, but only 1-bit PMI_IND set to '0' is transmitted by eNodeB.

In most cases, all of the PMIs used by eNodeB and WTRU are the same, and instead of sending a dedicated reference signal, only the PMI_IND1 bit set to '0' is sent by eNodeB. Therefore, this signaling method also significantly reduces the overhead of the dedicated reference signal.

The PMI indicator signaling according to the invention can be applied to both single-user SU MIMO and multi-user MU MIMO due to the reduced signaling overhead. In SU-MIMO, only PMI indicators for one WTRU are transmitted by eNodeB within subband or frequency and time resources. In MU-MIMO, eNodeB sends multiple PMI indicators for multiple WTRUs that share the same subband or the same frequency and time resources. Therefore, this is a simple extension from SU-MIMO.

MU-MIMO assumes that there are K WTRUs. The eNodeB transmits multiple PMI validation signals, each of which has one or more PMIs of each WTRU or WTRU 1, WTRU 2, ..., WTRU K. eNodeB sends multiple PMI indicators to the WTRU. Each WTRU uses one PMI indicator if no group PMI is used as shown in Figure 4, and a group PMI is used for that WTRU as shown in Figures 5 and 6 or 7 and 8. If so, receive multiple PMI indicators.

If the PMI is the same on the eNodeB and the k WTRU, the eNodeB sends a 1-bit PMI indicator to the k WTRU. If the PMI is not the same for the eNodeB and the k WTRU, the eNodeB will be PMI_IND.^(k)The PMI indicator represented by and the PMI of the k WTRU^(k)Send the PMI represented by to the k WTRU.

For example, if the PMI is not the same for eNodeB and the first WTRU, but for all other WTRUs, then the 1-bit PMI_IND⁽¹⁾And PMI⁽¹⁾Is sent by eNodeB to the 1st WTRU and is a 1-bit PMI_IND with k = 2, 3, ..., K.^(k)Is sent by eNodeB to all other WTRUs. Instead, in MU-MIMO, eNodeB sends multiple PMI indicators for each group of WTRUs. eNodeB can also send one PMI indicator for every WTRU. For MU-MIMO, the pre-recording method and usage can be generalized as described above.

Suppose there is one stream per user for two users supported simultaneously within the same RB or RBG, i.e. each WTRU sees a rank 1 transmission for itself. Further assume that there are eight beamforming vectors C1, C2, ..., C8 in the beamforming codebook. Table 12 illustrates this method, which, when PMI_IND = 0 (affirmation message), uses WTRU feedback in eNodeB (C)._desired) Indicates that eNodeB confirms that. The 3-bit PMI is another user's seven possible interfering beamforming vectors or C._j, J = 1, 2, ..., 8 and C_j C_desiredIs shown. One bit combination (111) is reserved. If PMI_IND = 1, this indicates that eNodeB does not use WTRU feedback and uses a different beamforming vector. 3-bit PMI is 8 possible beamforming vectors (C) for the desired user_j, J = 1, 2, ..., 8). There is no separate indication of interfering beamforming vectors unless the signaling overhead is allowed to increase.

<tables num="24"><img id="000025" he="129" wi="134" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

Another option is to use the default beamforming vector for the desired user when PMI_IND is 1 (negative confirmation message), 7 possible interfering vectors similar when PMI_IND = 0. Use a 3-bit PMI to indicate.

Similarly, Table 13 describes the methods for 4-user MU-MIMO and rank 1 per user.

<tables num="25"><img id="000026" he="97" wi="159" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

If certain constraints are imposed, the number of vector combinations can be reduced, and thus the number of bits can be reduced. For example, if the rule limits, only certain combinations are allowed, for example C₁, C₂, C₃, C₄Can be combined together as a group, C₅, C₆, C₇, C₈Can be combined together as a group, Group C₁, C₂, C₃, C₄Group C₅, C₆, C₇, C₈Cannot be combined with. For example, C1 can be combined with C2, C3, or C4, but not with C5, C6, C7, or C8. A combination constraint requirement can be a rule for satisfying a unitary property or unitary beamforming requirement.

As an example, suppose C1 is a beamforming vector for the desired user and constraint rules are used. Vector combinations can be reduced to 7 combinations. For two users, only combinations [C1, C2], [C1, C3], and [C1, C4] are allowed. For 3 users, only [C1, C2, C3], [C1, C2, C4], and [C1, C3, C4] are allowed. For 4 users, only [C1, C2, C3, C4] are allowed. Table 14 summarizes this particular scheme with constraints.

<tables num="26"><img id="000027" he="38" wi="152" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

Similar tables can be created for different beamforming vectors than C1 used for the desired user. PMI confirmation and indication messages can be coded jointly, and the corresponding PMI confirmation and indication methods can be: That is, if PMI_IND = 000, check the WTRU feedback. If PMI_IND = 001, inform WTRU that C2 is an interfering beamforming vector. When PMI_IND = 1010, it informs WTRU that C3 is an interfering beamforming vector, etc., as shown in Table 16. If PMI_IND = 111, inform WTRU that C2, C3, and C4 are interfering beamforming vectors. This is shown in the following table.

<tables num="27"><img id="000028" he="109" wi="158" file="JP6006397B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>

Another alternative is to have PMI_IND = 000 as the confirmation message and PMI_IND = 001 ~ 111 as the indication message to indicate the seven possible desired vectors. The seven vectors or matrices are selected from C1 to C8 or preselected. Similar tables can be created for different beamforming vectors than C1 used for the desired user.

Joint coding can be performed on programming confirmation messages, programming information, or indication messages that may or may not contain rank information for different designs and objectives. In addition, joint coding can be performed on rank override messages, feedback error messages, or other MIMO-related information and messages.

FIG. 11 shows a wireless communication system having a plurality of eNodeB 1113s that implement the described embodiments. Each eNodeB 1113 provides communication coverage for a particular geographic area illustrated as an idealized hexagon, commonly referred to as a cell. The term "cell" can refer to its coverage area, depending on the context in which the term is used. To improve system capacity, the eNodeB coverage area can be divided into multiple smaller areas, such as three smaller areas. WTRU 1111 may be scattered throughout the coverage area.

Embodiment 1. A method of reducing the signaling overhead of a radio transmit / receive unit (WTRU) in multiple-input multiple-output MIMO radio communication by using pre-recording confirmation and pre-recording information or indications in the form of validation messages. hand, A step that uses a validation message to indicate the type of pre-recording information used by evolved Node B (eNodeB), the validation message containing at least one bit of the step to use. The validation message provides a programming confirmation message and an indication message, and the validation message can consist of one confirmation message and one indication message using different coding. , The validation message can also be a single message indicating a confirmation, information, override, or error message that uses joint coding. The indication message can be a pre-recording information indication message, a rank override message, a feedback error message, or a combination, and can indicate the pre-recording information of a single-user SU-MIMO. It can also indicate desired pre-recording information about multiple-user MU-MIMO, interfering pre-recording information, or both. A method characterized by that.

2. The method according to embodiment 1, wherein the pre-recording information can also include a pre-recording matrix, rank, other pre-recording related information, or all combinations.

3. The method according to embodiment 1, wherein the validation message consists of at least two of a confirmation message, an indication message, a feedback error message, and an override error message.

4. The method according to embodiment 1, wherein the pre-recording confirmation and indication message (validation message) can be encoded separately or jointly.

5. The method of embodiment 1, wherein the validation message itself consists of two parts, a confirmation part and an indication part, when the validation message is coded or encoded separately.

6. The method according to embodiment 5, wherein the confirmation portion uses one or more bits to carry an affirmative or negative confirmation message.

7. The affirmative confirmation message is described in Embodiment 6, characterized in that it is used to inform the WTRU that the pre-recording information used by the eNodeB is exactly the same as the pre-recording information fed back from the WTRU. the method of.

8. The method according to embodiment 6, wherein the negative confirmation message is used to inform the WTRU that the pre-recording information used in the eNodeB is not the same as the pre-recording information fed back from the WTRU. ..

9. The method according to embodiment 6, wherein the indication portion uses at least one bit to carry a plurality of indication messages.

10. The method according to embodiment 6, wherein the indication portion indicates to the WTRU that different recording information is being used in the eNodeB.

11. The method of embodiment 3, wherein the validation message is a combination of a confirmation part and an indication part when the validation message is jointly coded or encoded.

12. A method of reducing the signaling overhead of a radio transmit / receive unit (WTRU) in multiple-input multiple-output MIMO radio communication by using recording confirmation and recording information or indications. Steps to send a recording matrix index (PMI) containing antenna weights and beamforming weights to evolved Node-B (eNodeB), and With the step of receiving a validation message from eNodeB as a PMI indicator containing information about its antenna weight A method characterized by including.

13. Embodiment 12 characterized in that a part of the validation message is sent to the WTRU via a dedicated reference signal and a part of the validation message is sent to the WTRU via a control signaling scheme. The method described in.

14. The method according to embodiment 12, wherein the eNodeB sends only a recording confirmation message or a PMI indicator when the PMI of the WTRU and the PMI of the eNodeB are the same.

15. eNodeB sets the PMI indicator to WTRU with its PMI when the PMI of WTRU and eNodeB are not the same, or when the PMI of WTRU is overridden by the PMI of eNodeB, or when a feedback error occurs. 12. The method of embodiment 12, characterized in that transmission.

16. The PMI indicator size according to embodiment 12, characterized in that the PMI indicator size is one or more bits, can represent a state check, and can be any value, depending on the design choice. Method.

17. A method of reducing the signaling overhead of a radio transmit / receive unit (WTRU) in multiple-input multiple-output MIMO radio communication by using recording confirmation and recording information or indications. Steps to send multiple recording matrix indexes (PMIs), including antenna weights and beamforming weights, to eNode B, and With the step of receiving a validation message from eNodeB as an individual PMI indicator for each PMI containing information about its antenna weights A method characterized by including.

18. Embodiment 12 characterized in that a part of the validation message is sent to the WTRU via a dedicated reference signal and a part of the validation message is sent to the WTRU via a control signaling scheme. The method described in.

19. The method according to embodiment 17, wherein the eNodeB transmits only the PMI indicator when the PMI of the WTRU and the PMI of the eNodeB are the same.

20. Node-B is when at least one of the WTRU's PMI and at least one of the eNodeB's PMI is not the same, or when the WTRU's PMI is overridden by the eNodeB's PMI, or a feedback error occurs. 12. The method of embodiment 17, characterized in that a PMI indicator is sent to the WTRU along with its PMI when it occurs.

21. The PMI indicator size according to embodiment 17, characterized in that the PMI indicator size is one or more bits, can represent a state check, and can be any value, depending on the design choice. Method.

22. A method of reducing the signaling overhead of a radio transmit / receive unit (WTRU) in multiple-input multiple-output MIMO radio communication by using recording confirmation and recording information or indications. Steps to send multiple pre-recording matrix index PMIs separated into groups containing antenna weights and beamforming weights to eNodeB, With the step of receiving a validation message from eNodeB as an individual PMI indicator for each group of PMIs containing information about its antenna weights A method characterized by including.

23. Embodiment 22. A part of the validation message is sent to the WTRU via a dedicated reference signal, and a part of the validation message is sent to the WTRU via a control signaling method. 22 The method described in.

24. The method of embodiment 22, wherein eNodeB transmits only PMI indicators, including PMI indicators of all groups, when the PMI of the WTRU and the PMI of the groups of eNodeB are the same.

25. eNodeB is when at least one of the PMIs in the WTRU group and at least one of the PMIs in the eNodeB group are not identical, or when the WTRU PMI is overridden by the eNodeB PMI, or feedback. 22. The method of embodiment 22, wherein when an error occurs, a PMI indicator is sent to the WTRU along with the PMI.

26. The method of embodiment 22, wherein each group of PMI indicators or each PMI indicator has one or more bits to indicate whether the antenna weights are the same for eNodeB and WTRU.

27. The method of embodiment 22, characterized in that each group has only one PMI.

28. Of Embodiments 1, 12, 17, or 22 for transmitting the PMI indicator without altering the existing control signaling, characterized in that the PMI is either attached or embedded in the existing control signaling. The method described in either.

29. Validation confirmation and validation messages are a way to reduce signaling overhead in multiple-input multiple-output MIMO radio communication by using validation messages that include pre-recording information or indication messages. A confirmation message with 1 bit and A confirmation message with multiple bits and With one possible sub-message for an indication message that has at least a bit of different possible recording information, One possible submessage for an override message that has at least one bit indicating different override rules for recording, With one possible submessage for a feedback error message that has at least one bit indicating a different recording rule for handling the feedback error A method characterized by consisting of.

30. Validation between radio transmission / reception unit (WTRU) and evolved NodeB eNodeB in multiple-input multiple-output MIMO radio communication by using pre-recording confirmation and pre-recording information or indications in the form of messages. It is an eNodeB that reduces the overhead, and the eNodeB is It is configured to send a validation message to indicate the type of pre-recording information used by eNodeB, and the validation message consists of at least 1 bit. The validation message provides a confirmation message and an indication message, and the validation message can consist of one confirmation message and one indication message that use different coding. The validation message can also be a single message indicating a confirmation, information, override, or error message that uses joint coding. The indication message can be a pre-recording information indication message, a rank override message, a feedback error message, or a combination, and can indicate the pre-recording information of a single-user SU-MIMO. It can also indicate desired pre-recording information about multiple-user MU-MIMO, interfering pre-recording information, or both. The eNodeB is characterized by that.

31. The eNodeB according to embodiment 30, wherein the pre-recording information can include a pre-recording matrix, rank, other pre-recording related information, or all combinations.

32. The eNodeB according to embodiment 30, wherein the validation message comprises a combination of at least two of a confirmation message, an indication message, a feedback error message, and an override error message.

33. ENodeB according to embodiment 30, wherein the validation messages can be coded or encoded separately, or jointly coded or encoded.

34. When the programming confirmation and indication message (validation message) is coded or encoded separately, the validation message itself is characterized by two parts: a confirmation part and an indication part. The eNodeB according to the thirtieth embodiment.

35. The eNodeB according to embodiment 34, wherein the confirmation portion uses one or more bits to carry an affirmative or negative confirmation message.

36. The affirmative confirmation message is described in embodiment 34, characterized in that the affirmative confirmation message is used to inform the WTRU that the pre-recording information used by the eNodeB is exactly the same as the pre-recording information fed back from the WTRU. ENodeB.

37. The eNodeB according to embodiment 34, wherein the negative confirmation message is used to inform the WTRU that the pre-recording information used by the eNodeB is not the same as the pre-recording information fed back from the WTRU. ..

38. The eNodeB according to embodiment 34, wherein the indication portion uses at least one bit to carry a plurality of indication messages.

39. The eNodeB according to embodiment 34, wherein the indication portion indicates to the WTRU that different pre-recording information is being used in the eNodeB.

40. The validation message according to embodiment 34, wherein when the validation message is jointly coded or encoded, the validation part and the indication part are combined into a single part or field. eNodeB.

41. Multiple-input multiple-output suitable for recording confirmation and recording information or indication An evolved Node B (eNode B) that operates within MIMO radio communication and reduces signaling overhead. Receives a recording matrix index (PMI) from the WTRU, including the radio transmit / receive unit (WTRU) antenna weights. Send a validation message to WTRU as a PMI indicator containing information about its own antenna weight The eNodeB is characterized by being configured as follows.

42. The eNodeB according to embodiment 41, wherein the validation message is transmitted to the WTRU via a dedicated reference signal or via a control signaling scheme.

43. The eNodeB according to embodiment 41, wherein the eNodeB transmits only the PMI indicator when the PMI of the WTRU and the PMI of the eNodeB are the same.

44. Node-B will display the PMI indicator with the PMI when the PMI of the WTRU and the PMI of the eNodeB are not the same, or when the PMI of the WTRU is overridden by the PMI of the eNodeB, or when a feedback error occurs. The eNodeB according to embodiment 41, which comprises transmitting to a WTRU.

45. PMI indicator size according to embodiment 41, characterized in that the PMI indicator size is one or more bits, can represent a state check, and can be any value, depending on the design choice. eNodeB.

46. Evolved Node B (eNodeB) that reduces signaling overhead and operates within multiple-input multiple-output MIMO radio communications suitable for recording confirmation and recording information or indications. Receives multiple recording matrix indexes (PMIs) from the WTRU, including the radio transmit / receive unit (WTRU) antenna weights. Send a validation message to the WTRU as an individual PMI indicator containing information about its own antenna weight The eNodeB is characterized by being configured as follows.

47. Embodiment 46, characterized in that part of the validation message is sent to the WTRU via a dedicated reference signal and part of the validation message is sent to the WTRU via a control signaling scheme. The method described in.

48. The eNodeB according to embodiment 46, wherein the eNodeB transmits only the PMI indicator when the PMI of the WTRU and the PMI of the eNodeB are the same.

49. eNodeB encounters a feedback error when at least one of the WTRU PMIs and at least one of the eNodeB PMIs are not identical, or when the WTRU PMI is overridden by the eNodeB PMI. The eNodeB according to embodiment 46, wherein the PMI indicator is sometimes transmitted to the WTRU along with its PMI.

50. PMI indicator size described in embodiment 46, characterized in that the PMI indicator size is 1 bit or more, can represent a state check, and can be any value, depending on the design choice. ENodeB.

51. The eNodeB according to embodiment 46, wherein the PMI is either attached to or embedded in an existing control signaling and is configured to transmit a PMI indicator without altering the existing control signaling.

52. Multiple-input multiple-output suitable for recording confirmation and recording information or display Evolved Node B (eNode B) that operates within MIMO radio communication and reduces signaling overhead. Receives multiple recording matrix indexes (PMIs) from the WTRU that are separated into groups containing the radio transmit / receive unit (WTRU) antenna weights. Send a validation message to the WTRU as an individual PMI indicator for each group of PMIs with information about its own antenna weights The eNodeB is characterized by being configured as follows.

53. Embodiment 52, characterized in that part of the validation message is sent to the WTRU via a dedicated reference signal and part of the validation message is sent to the WTRU via a control signaling scheme. ENodeB described in.

54. The eNodeB according to embodiment 52, wherein the eNodeB transmits only the PMI indicators including the PMI indicators of all the groups when the PMI of the WTRU and the PMI of the groups of the eNodeB are the same.

55. eNodeB is when at least one of the PMIs in the WTRU group and at least one of the PMIs in the eNodeB group are not identical, or when the WTRU PMI is overridden by the eNodeB PMI, or feedback. The eNodeB according to embodiment 52, wherein when an error occurs, a PMI indicator is sent to the WTRU along with the PMI.

56. ENodeB according to embodiment 52, wherein each group of PMI indicators or each PMI indicator has one or more bits to indicate whether the antenna weights are the same for the eNodeB and WTRU.

57. The eNodeB according to embodiment 52, wherein each group has only one PMI.

58. The eNodeB according to embodiment 52, wherein the PMI is either attached to or embedded in an existing control signaling and is configured to transmit a PMI indicator without altering the existing control signaling.

59. Multiple-input multiple-output To operate with MIMO radio communication, have transceivers and processors for recording confirmation and recording information or display, and generate validation messages containing recording matrix information PMI. The configured, evolved Node B (eNodeB) that reduces signaling overhead, and the validation message is Confirmation message with 1 bit, or A confirmation message with multiple bits and With one possible sub-message for an indication message that has at least a bit of different possible recording information, One possible submessage for an override message that has at least one bit indicating different override rules for recording, With one possible submessage for a feedback error message that has at least one bit indicating a different recording rule for handling the feedback error An eNodeB characterized by containing.

60. Validation Signaling between evolved Node B and radio transmit / receive unit (WTRU) in multiple-input multiple-output MIMO radio communication by using pre-recording confirmation and pre-recording information or indications in the form of messages. WTRU that reduces overhead It is configured to receive a validation message indicating the type of pre-recording information used by eNodeB, and the validation message contains at least one bit. The validation message provides a programming confirmation message and an indication message, and the validation message can consist of one confirmation message and one indication message using different coding. , The validation message can also be a single message indicating a confirmation, information, override, or error message that uses joint coding. The indication message can be a pre-recording information indication message, a rank override message, a feedback error message, or a combination, and can indicate the pre-recording information of a single-user SU-MIMO. It can also indicate desired pre-recording information about multiple-user MU-MIMO, interfering pre-recording information, or both. WTRU characterized by that.

61. WTRU according to embodiment 60, wherein the validation message comprises at least two combinations of a confirmation message, an indication message, a feedback error message, and an override error message.

62. WTRU according to embodiment 60, wherein the pre-recording information and the indication message (validation message) can be encoded separately or jointly.

63. WTRU according to embodiment 60, wherein the validation message itself consists of two parts, namely a confirmation part and an indication part, when the validation message is coded or encoded separately.

64. WTRU according to embodiment 63, wherein the confirmation portion uses one or more bits to carry an affirmative or negative confirmation message.

65. The affirmative confirmation message is described in embodiment 60, characterized in that the affirmative confirmation message is used to inform the WTRU that the pre-recording information used by the eNodeB is exactly the same as the pre-recording information fed back from the WTRU. WTRU.

66. The WTRU according to embodiment 60, wherein the negative confirmation message is used to inform the WTRU that the pre-recording information used by the eNodeB is not the same as the pre-recording information fed back from the WTRU. ..

67. WTRU according to embodiment 63, wherein the indication portion uses one or more bits to carry a plurality of indication messages.

68. The WTRU according to embodiment 64, wherein the indication portion indicates to the WTRU that different recording information is being used in the eNodeB.

69. WTRU according to embodiment 64, wherein the validation message is a combination of a confirmation part and an indication part when the validation message is jointly coded or encoded.

70. Multiple-input Multiple-output Operates with MIMO radio communication, has transceivers and processors and processors for recording confirmation and recording information or indications, and generates validation messages containing recording matrix information PMI. A radio transmit / receive unit WTRU that is configured to reduce signaling overhead and has a validation message. Confirmation message with 1 bit, or A confirmation message with at least one bit, With one possible sub-message for an indication message that has at least a bit of different possible recording information, One possible submessage for an override message that has at least one bit indicating different override rules for recording, With one possible submessage for a feedback error message that has at least one bit indicating a different recording rule for handling the feedback error WTRU characterized by containing.

71. Multiple-input multiple-output A radio transmit / receive unit (WTRU) that operates in MIMO radio communication and has a transceiver and processor for recording confirmation and recording information or indication to reduce signaling overhead. Send the recording matrix index (PMI) containing the WTRU antenna weights to evolved NodeB (eNodeB) and Receive validation message from eNodeB as a PMI indicator containing information about its own antenna weight The WTRU is characterized by being configured in such a manner.

72. WTRU according to embodiment 71, wherein some of the validation messages are received via a dedicated reference signal and some of the validation messages are received via a control signaling scheme. ..

73. WTRU according to embodiment 72, wherein the WTRU receives only a recording confirmation or PMI indicator when the PMI of the WTRU and the PMI of the eNodeB are the same.

74. The WTRU receives a PMI indicator with its PMI when the WTRU's PMI and eNodeB's PMI are not identical, or when the WTRU's PMI is overridden by the eNodeB's PMI, or when a feedback error occurs. WTRU according to embodiment 71.

75. PMI indicator size according to embodiment 71, characterized in that the PMI indicator size is one or more bits, can represent a state check, and can be any value, depending on the design choice. WTRU.

76. Described in Embodiment 71, wherein a portion of the validation message is received by the transceiver via a dedicated reference signal and a portion of the validation message is received via a control signaling scheme. WTRU.

77. Multiple-input multiple-output A radio transmit / receive unit (WTRU) that operates in MIMO radio communication and has a transceiver and processor for recording confirmation and recording information or indication to reduce signaling overhead. Send multiple recording matrix indexes (PMIs) containing WTRU antenna weights to evolved NodeB (eNodeB) Receive validation messages from eNodeB as individual PMI indicators containing information about the antenna weights of eNodeB itself The WTRU is characterized by being configured in such a manner.

78. WTRU according to embodiment 77, wherein a portion of the validation message is received by the transceiver via a dedicated reference signal or via a control signaling scheme.

79. WTRU according to embodiment 77, wherein the WTRU receives only the PMI indicator from the eNodeB when the PMI of the WTRU and the PMI of the eNodeB are the same.

80. WTRU causes a feedback error when at least one of the WTRU's PMI and at least one of the eNodeB's PMI are not identical, or when the WTRU's PMI is overridden by the eNodeB's PMI. WTRU according to embodiment 77, wherein the PMI indicator is sometimes received together with the eNodeB PMI.

81. Described in Embodiment 80, wherein the PMI indicator size is one or more bits, can represent a state check, and can be any value, depending on the design choice. WTRU.

82. Multiple-input multiple-output A radio transmit / receive unit (WTRU) that operates in MIMO radio communication and has a transceiver and processor for recording matrix display to reduce signaling overhead. Send multiple recording matrix indexes (PMIs) separated into groups containing WTRU antenna weights to evolved NodeB (eNodeB) Receive validation messages from eNodeB as individual PMI indicators for each group of PMIs with information about their own antenna weights The WTRU is characterized by being configured in such a manner.

83. Described in Embodiment 82, wherein some of the validation messages are received by the transceiver via a dedicated reference signal and some of the validation messages are received via a control signaling scheme. WTRU.

84. WTRU according to embodiment 82, wherein the WTRU receives only one PMI indicator from the eNodeB including the PMI indicators of all groups when the PMI of the WTRU and the PMI of the group of eNodeB are the same. ..

85. WTRU is when at least one of the PMIs in the WTRU group and at least one of the PMIs in the eNodeB group are not identical, or when the WTRU PMI is overridden by the eNodeB PMI, or feedback. WTRU according to embodiment 82, wherein a PMI indicator is received from the eNodeB along with its PMI when an error occurs.

86. WTRU according to embodiment 82, wherein each group of PMI indicators or each PMI indicator has one or more bits to indicate whether the antenna weights are the same for the eNodeB and WTRU.

87. WTRU according to embodiment 82, wherein each group has only one PMI.

88. The WTRU of Embodiment 82 configured to receive a PMI indicator from an eNodeB, characterized in that the PMI is either attached or embedded in existing control signaling.

Although the features and elements of the present invention have been described in a particular combination in preferred embodiments, each feature or element may be used alone or without other features and elements of the preferred embodiment. Can be used in various combinations with or without. The methods or flow diagrams provided in the present invention can be implemented in computer programs, software, or firmware that are tangibly implemented in a computer-readable storage medium for execution by a general purpose computer or processor. Examples of computer-readable storage media include read-only memory ROM, random access memory RAM, registers, cache memory, semiconductor memory devices, magnetic media such as internal hard disks and removable disks, optomagnetic media, and CD-ROM disks and digital versatility. Includes optical media such as disc DVDs.

Suitable processors are, for example, general purpose processors, special purpose processors, traditional processors, digital signal processor DSPs, multiple microprocessors, one or more microprocessors associated with DSP cores, controllers, microcontrollers, application specific integrations. Includes circuit ASICs, field programmable gate array FPGA circuits, any other type of integrated circuit IC, and / or state machines.

The processor associated with the software can be used to implement the radio frequency transceiver, radio transmit / receive unit WTRU, terminal, base station, radio network controller RNC, or any host computer used within the radio transmit / receive unit WTRU. WTRU includes cameras, camcorder modules, camcorders, speakerphones, vibrating devices, speakers, microphones, television receivers, hands-free headsets, keyboards, Bluetooth® modules, frequency-modulated FM wireless units, liquid crystal display LCDs. With modules implemented in hardware and / or software, such as display units, organic light emitting diode OLED display units, digital music players, media players, camcorder player modules, internet browsers, and / or any wireless local area network WLAN modules. Can be used.