High-performance codebook design
A low-complexity codebook design with inter-layer amplitude and flexible SD bases selection addresses the challenge of high-resolution PMI feedback, enhancing precoding performance and reducing reporting overhead in wireless communication systems.
Patent Information
- Application Number
- PCT/CN2024/074096
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-01-25
- Publication Date
- 2025-07-31
AI Technical Summary
Existing codebooks for channel state information reporting in wireless communication systems, such as Type-I and Type-II/eType-II codebooks, face challenges in achieving high-performance precoding with low complexity and reduced reporting overhead, particularly in high-resolution PMI feedback scenarios.
A low-complexity codebook design is introduced that incorporates inter-layer amplitude reporting, flexible wideband SD bases selection, and subband SD bases reporting to enable more accurate CSI feedback with limited overhead, based on the Type-I codebook framework.
The proposed codebook design reduces reporting overhead while providing higher precoding performance, increasing efficiency and network capacity and reducing latency in wireless communication systems.
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Figure CN2024074096_31072025_PF_FP_ABST
Abstract
Description
HIGH-PERFORMANCE CODEBOOK DESIGNTECHNICAL FIELD
[0001] This disclosure is directed generally to digital wireless communications.BACKGROUND
[0002] Mobile communication technologies are moving the world toward an increasingly connected and networked society. The rapid growth of mobile communications and advances in technology have led to greater demand for capacity and connectivity. Other aspects, such as energy consumption, device cost, spectral efficiency, and latency are also important to meeting the needs of various communication scenarios.
[0003] Long-Term Evolution (LTE) is a standard for wireless communication for mobile devices and data terminals developed by 3rd Generation Partnership Project (3GPP) . LTE Advanced (LTE-A) is a wireless communication standard that enhances the LTE standard. The 5th generation of wireless system, known as 5G, advances the LTE and LTE-A wireless standards and is committed to supporting higher data-rates, large number of connections, ultra-low latency, high reliability and other emerging business needs. Various techniques, including new ways to provide higher quality of service, longer battery life, and improved performance are being discussed.SUMMARY
[0004] Techniques are disclosed for codebook design configured to allow high-performance and low-complexity downlink precoding. These techniques may reduce reporting overhead for channel state information reporting, such as in the case of precoding matrix indicator reporting.
[0005] In one aspect, a method of wireless communication performed by a wireless device (e.g., a user equipment (UE) ) is disclosed. The method includes: receiving, at the wireless device from a network device, a reference signal (RS) for channel measurement and a channel state information (CSI) reporting configuration signaling; determining, by the wireless device, CSI based on the RS and the CSI reporting configuration signaling, wherein the CSI comprises a precoding matrix indicator (PMI) indicating a v-layer precoding matrix for v transmission layers, and transmitting, from the wireless device to the network device, the CSI.
[0006] In another aspect, a method of wireless communication performed by a network device (e.g., a base station (BS) , a network node) is disclosed. The method includes: transmitting, by the network device to a wireless device, a reference signal (RS) for channel measurement and a channel state information (CSI) reporting configuration signaling; and receiving, at the network device from the wireless device, CSI determined based on the RS and the CSI reporting configuration signaling, wherein the CSI comprises a precoding matrix indicator (PMI) indicating a v-layer precoding matrix for v transmission layers.
[0007] In yet another exemplary aspect, the above-described methods are embodied in the form of processor-executable code and stored in one or more non-transitory computer-readable storage media. The code included in the computer readable storage media when executed by one or more processors, causes the one or more processors to implement the methods described in this patent document.
[0008] In yet another exemplary embodiment, a wireless communication device that is configured or operable to perform the above-described methods is disclosed. The wireless communication device may be a wireless device (e.g., a wireless device (e.g., a UE) , or a network device (e.g., a BS) .
[0009] The above and other aspects and their implementations are described in greater detail in the drawings, the descriptions, and the claims.
[0010] BRIEF DESCRIPTION OF THE DRAWING
[0011] Figure 1 shows an example of a wireless communication system in accordance with some embodiments of the disclosed technology.
[0012] Figure 2 is a block diagram representation of a portion of an apparatus in accordance with some embodiments of the disclosed technology.
[0013] Figure 3 shows an example wideband SD basis indication according to some embodiments of the disclosed technology.
[0014] Figure 4 shows an example indication of a mapping relationship between selected wideband SD bases and the layers via a permutation number according to some embodiments of the disclosed technology.
[0015] Figure 5 shows an example of SD basis indication according to some embodiments of the disclosed technology.
[0016] Figure 6 shows an example SD basis indication according to some embodiments of the disclosed technology.
[0017] Figure 7 shows an example subband SD basis indication according to some embodiments of the disclosed technology.
[0018] Figure 8 shows a flowchart of an example method of wireless communication in accordance with some embodiments of the disclosed technology.
[0019] Figure 9 shows a flowchart of an example method of wireless communication in accordance with some embodiments of the disclosed technology.DETAILED DESCRIPTION
[0020] The example headings for the various sections below are used to facilitate the understanding of the disclosed subject matter and do not limit the scope of the claimed subject matter in any way. Accordingly, one or more features of one example section can be combined with one or more features of another example section. Furthermore, 5G terminology is used for the sake of clarity of explanation, but the techniques disclosed in the present document are not limited to 5G technology only, and may be used in wireless systems that implemented other protocols.
[0021] The new radio (NR) technology of fifth generation (5G) mobile communication systems is continuously improved to provide higher quality wireless communication. In a multiple-input-multiple-output (MIMO) communication system operated in frequency-division-duplexing (FDD) mode, typically a wireless device (e.g., a UE) may measure downlink (DL) channel state information (CSI) through a DL reference signal (RS) and feed back the CSI to a network device (e.g., a BS) . The CSI can include at least one of: a CSI-RS resource indicator (CRI) , a rank indicator (RI) , a layer indicator (LI) , a precoding matrix indicator (PMI) , or a channel quality indicator (CQI) . Among these CSI quantities, PMI may reflect the DL channel response and cost a highest reporting overhead. Typically, PMI reporting may be based on a predefined codebook. Hence, the reporting accuracy and overhead may depend on or relate to the codebook structure.
[0022] Up to release 17, the 3GPP protocols specify mainly two types of codebooks, namely Type-I and Type-II / e-Type-II codebooks for PMI reporting. In release 17, the 3GPP protocols further introduce two types of enhanced eType-II codbooks, namely eType-II codebook for coherent joint transmission (CJT) and eType-II codebook for predicted PMI, which support PMI reporting in CJT and medium / high speed scenarios, respectively. In comparison, Type-I codebook has simple structure and costs low reporting overhead, while Type-II / eType-II codebook has complex structure and costs high reporting overhead. In practical implementation, Type-I cannot meet the demand of high-resolution PMI feedback, and hence shows poor performance. Meanwhile, Type-II / eType-II codebook suffers from unacceptable high reporting overhead and high implementation complexity. Therefore, a usable codebook with acceptable performance and reporting overhead is urgently needed.
[0023] In this connection, the present document describes a low-complexity codebook design. The codebook design as disclosed may be based on the Type-I codebook framework and include one or more features of inter-layer amplitude reporting, a more flexible wideband SD bases selection, and / or subband SD bases reporting, to enable more accurate CSI feedback with limited reporting overhead. The codebook according to embodiments of the present document may cost a little higher reporting overhead than the existing Type-I codebook design, but can provide much higher precoding performance than the existing Type-I codebook design. Benefits of reduced reporting overhead of precoding matrix indicator (PMI) reporting in wireless communication systems may include increased efficiency / network capacity and / or reduced latency due to less bandwidth and / or time consumed for transmitting PMI and correspondingly more bandwidth available for actual data transmission.
[0024] As used herein, “UE” can include or be equivalent to a wireless device, or referred to as a wireless communication device.
[0025] As used herein, “BS” can include or be equivalent to a next Generation Node B (gNB) , a wireless network device, or a transmission and reception point (TRP) .
[0026] As used herein, an “antenna port” can include or be equivalent to a BS antenna port, or a CSI-RS antenna port.
[0027] As used herein, a “higher layer parameter” can include or be equivalent to a radio resource control (RRC) parameter.
[0028] As used herein, a “spatial-domain (SD) basis” can include or be equivalent to vl, m or The quantities vl, m and corresponding to (l, m) are defined in clause 5.2.2.2.1 of TS 38.214 as
[0029] where N1 and N2 are defined in clause 5.2.2.2.1 of TS 38.214; the number (or count) of antenna ports P=2N1N2; and O1 and O2 are oversampling factors defined in clause 5.2.2.2.1 of TS 38.214, the contents of which are incorporated herein by reference.
[0030] As used herein, the quantities and θp are defined in clause 5.2.2.2.1 of TS 38.214 as θp=ejπp / 4. (5)
[0031] As used herein, the “amplitude” can refer to or be equivalent to an amplitude coefficient, or coefficient amplitude.
[0032] Figure 1 shows an example of a wireless communication system (e.g., a long term evolution (LTE) , 5G or NR cellular network) that includes a BS 120 and one or more user equipment (UE) 111, 112, and 113. In some embodiments, the uplink transmissions (131, 132, 133) can include uplink control information (UCI) , higher layer signaling (e.g., UE assistance information or UE capability) , or uplink information. In some embodiments, the downlink transmissions (141, 142, 143) can include downlink control information (DCI) or high layer signaling or downlink information. The UE may be, for example, a smartphone, a tablet, a mobile computer, a machine to machine (M2M) device, a terminal, a mobile device, an Internet of Things (IoT) device, and so on.
[0033] Figure 2 is a block diagram representation of a portion of an apparatus based on some embodiments of the disclosed technology. An apparatus 205 such as a network device (e.g., a base station (BS) ) or a wireless device (e.g., a user equipment (UE) ) , can include processor electronics 210 such as a microprocessor that implements one or more of the techniques presented in this document. The apparatus 205 can include transceiver electronics 215 to send and / or receive wireless signals over one or more communication interfaces such as antenna (s) 220. The apparatus 205 can include other communication interfaces for transmitting and receiving data. Apparatus 205 can include one or more memories (not explicitly shown) configured to store information such as data and / or instructions. In some implementations, the processor electronics 210 can include at least a portion of the transceiver electronics 215. In some embodiments, at least some of the disclosed techniques, modules or functions are implemented using the apparatus 205.
[0034] In some embodiments, a CSI reporting may proceed as follows. A wireless device may receive CSI reporting configuration signaling and an RS for channel measurement from a network device. The CSI reporting configuration signaling may be a higher layer parameter or an RRC parameter. The wireless device may determine CSI based on the CSI reporting configuration signaling and the RS for channel measurement. The CSI may contain at least of a channel matrix indicator (CMI) , an RI, a LI, a PMI, and a CQI. The PMI may indicate a v-layer precoding matrix. The v-layer precoding matrix may correspond to v transmission layers, or layers for brevity. The wireless device may transmit the CSI to the network device.
[0035] Embodiment 1: Inter-layer amplitude reporting
[0036] The PMI can include inter-layer amplitudes or one or more indicators of the inter-layer amplitudes. In some embodiments, the layer corresponding to the maximum amplitude among the v layers can be indicated by the LI in the CSI report. In some embodiments, the layer corresponding to the maximum amplitude can always be set as a boundary layer (e.g., the first layer or the last layer) among the v layers. In some embodiments, the PMI may omit the maximum amplitude and not include it among the inter-layer amplitudes for reporting. In some embodiments, the inter-layer amplitudes can be ordered from the first layer to the last layer, or from the last layer to the first layer. In some embodiments, the inter-layer amplitudes can be arranged in descending / ascending order. In some embodiments, whether the PMI includes inter-layer amplitudes (or one or more indicators of the inter-layer amplitudes) can be determined by at least one of: a configurable parameter in the CSI reporting configuration signaling or the capability of the wireless device. The CSI reporting configuration signaling may be a higher layer parameter or an RRC parameter. Each of the inter-layer amplitudes can be quantized using, e.g., 2, 3, or 4 bits.
[0037] A precoding matrix indicated by the PMI or the codebook structure can be expressed in the following formula: W= [a1w1 a2w2 … avwv] , (6)
[0038] where al and wl are the amplitude and the precoding vector corresponding to the l-th layer, respectively; and l can be an integer between 1 and the number (or count) v of the layers corresponding to the v-layer precoding matrix.
[0039] Embodiment 2: Flexible wideband SD bases selection across different layers or layer groups
[0040] The PMI can include one or more wideband (WB) SD bases (or one or more indicators of one or more SD bases) . The number (or count) L of the wideband SD bases can be 1, or ceil (v / X) , where X is an integer denoting the number (or count) of layers in a layer group. The set of L SD bases may be common over a wideband and reported only once and applicable for the entire wideband.
[0041] In some embodiments, the number (or count) L of the wideband SD bases may be 1. The wideband SD basis may correspond to all of the v layers such that the precoding vectors of all of the v layers may be based on the same wideband SD basis. This may be the case regardless of whether the v layers are grouped into one or more layer groups.
[0042] In some embodiments, the number (or count) L of the wideband SD bases may be greater than 1. A wideband SD basis may correspond to one layer or one layer group of the v layers. That is, the precoding vector (s) of each layer or layer group may be based on an associated wideband SD basis. A layer group may contain X or fewer layers. X can be a predefined value (e.g., 1, 2, or 4) , or configured according to a configurable parameter in the CSI reporting configuration signaling. The CSI reporting configuration signaling may be a higher layer parameter or an RRC parameter.
[0043] In some embodiments, X may be one. The number (or count) L of the wideband SD bases may be the same as the number (or count) v of the layers: L = v. The precoding vector of each layer may be based on an associated wideband SD basis. Merely by way of example, if the PMI does not further include subband SD bases (or one or more indicators of subband SD bases) or subband SD basis offsets (or one or more indicators of subband SD basis offsets) , the indicated precoding matrix or the codebook structure can be expressed in one of the following formulas:
[0044] where or is the wideband SD basis associated with the i-th layer; and θp, i are the inter-polarization phase and inter-subarray phase associated with the i-th layer, respectively; and θp, i can be layer common or layer specific.
[0045] In some embodiments, X may be two. The number (or count) L of wideband SD bases may be L = ceil (v / 2) . That is, each layer group may contain two or fewer layers. The precoding vector (s) of a layer group may be based on an associated wideband SD basis. Merely by way of example, if the PMI does not further include subband bases (or one or more indicators of subband SD bases) or subband SD basis offsets (or one or more indicators of subband SD basis offsets) , the indicated precoding matrix or the codebook structure can be expressed in one of the following formulas:
[0046] where the i-th layer group contains the (2i-1) -th layer, or the (2i-1) -th and 2i-th layers; or is the wideband SD basis associated with the i-th layer group; and θp, i are the inter-polarization phase and inter-subarray phase associated with the i-th layer group, respectively; and i is an integer between 1 and L. and θp, i can be layer group common or layer group specific.
[0047] As another example, if the PMI does not further include subband bases (or one or more indicators of subband SD bases) or subband SD basis offsets (or one or more indicators of subband SD basis offsets) , the indicated precoding matrix or the codebook structure can be expressed in one of the following formulas:
[0048] where the i-th layer group contains the i-th layer, or the i-th layer and (L+i) -th layer; or is the wideband SD basis associated with the i-th layer group; and i is an integer between 1 and L.
[0049] In some embodiments, X may be four. The number (or count) L of the wideband SD bases may be L = ceil (v / 4) . A layer group may contain four or fewer layers. The precoding vector (s) of a layer group may be based on an associated wideband SD basis. Merely by way of example, if the PMI does not further include subband bases (or one or more indicators of subband SD bases) or subband SD basis offsets (or one or more indicators of subband SD basis offsets) , and the number (or count) v of the layers v=8, the indicated precoding matrix or the codebook structure can be expressed in the following formulas:
[0050] where the first layer group contains the 1st to 4th layers corresponding to one wideband SD basis the second layer group contains the 5th to 8th layers corresponding to another wideband SD basis and is the wideband SD basis associated with the i-th layer group; and θp, i are the inter-polarization phase and inter-subarray phase associated with the i-th layer group, respectively, i can be an integer between 1 and L. For v=8, i can be one or two. and θp, i can be layer group common or layer group specific. As another example, if the number or count of layers v is smaller than eight, the indicated v-layer precoding matrix only include the first v column vectors in the above formula.
[0051] In some embodiments, the wideband SD bases can be indicated by the PMI using at least one of: a pair of oversampling indices, a bitmap, a combinatorial number, or a permutational number. Based on the PMI, the applicable wideband SD bases may be selected from a master set of SD bases.
[0052] The pair of oversampling indices (q1, q2) may include a pair of integers, where 0≤q1≤O1-1 and 0≤q2≤O2-1. As described elsewhere in the present document, O1 and O2 are oversampling factors defined in clause 5.2.2.2.1 of TS 38.214, the contents of which are incorporated herein by reference. In some embodiments, O1 and O2 may be configured with the CSI reporting configuration signaling.
[0053] The length of the bitmap can relate to N1 and / or N2. As described elsewhere in the present document, N1 and N2 are defined in clause 5.2.2.2.1 of TS 38.214, the contents of which are incorporated herein by reference. The number (or count) of antenna ports P=2N1N2. In some embodiments, N1 and N2 may be configured with the CSI reporting configuration signaling. If one bit in the bitmap is set to “1, ” the associated SD basis vl, m or corresponding to (l, m) may be selected as one of the wideband SD bases.
[0054] For example, the wideband SD bases can be indicated by the PMI using a pair of oversampling indices (q1, q2) and a bitmap. For example, the length of the bitmap may be N1N2, where the (aN2+b+1) th bit of the bitmap may be associated with the wideband SD basis in which 0≤a≤N1-1, 0≤b≤N2-1. As another example, the length of the bitmap can be where the (aN2+b+1) th bit may be associated with the SD basis If one bit in the bitmap is set to “1, ” the associated SD basis vl, m or corresponding to (l, m) may be selected as one of the wideband SD bases. From the first layer to the last layer of the v layers, for the associated wideband SD bases vl, m or the value lN2O2+m may change monotonically. Merely by way of example, as the layer index l increases from the first layer to the last layer of the v layers, each term (lN2O2+m) may be equal to or greater than the previous term ( (l-1) N2O2+m) . As another example, as the layer index l increases from the first layer to the last layer of the v layers, each term (lN2O2+m) may be equal to or smaller than the previous term ( (l-1) N2O2+m) .
[0055] Figure 3 shows an example SD basis indication via a pair of oversampling indices (q1, q2) and a bitmap according to some embodiments of the disclosed technology. In the example, N1=4, N2=2, O1-O2=4, and the length of the bitmap is N1N2=8. Each of the two N1O1×N2O2 arrays of boxes in Figure 3 illustrates a same master set of SD bases.
[0056] As another example, the wideband SD bases can be indicated by the PMI using a pair of oversampling indices (q1, q2) , a bitmap, and a permutational number. The oversampling indices (q1, q2) and the bitmap may determine selected wideband SD bases, and the permutational number may determine a mapping relationship between the selected wideband SD bases and the layers or layer groups.
[0057] Figure 4 shows an example indication of a mapping relationship between selected SD bases and the layers via a permutation number according to some embodiments of the disclosed technology. The selected wideband SD bases v6, 0, v10, 0, v2, 4, and v10, 4 may be determined based on oversampling indices (q1, q2) and a bitmap, and the mapping relationship between these selected wideband SD bases and the layers 1 through 4 may be determined based on a permutational number.
[0058] As a further example, the wideband SD bases can be indicated by the PMI using a pair of oversampling indices (q1, q2) and a combinatorial number. The i-th wideband SD basis or is indicated by (q1, q2) and according to
[0059] where are determined by the combinatorial number.
[0060] The i-th wideband SD basis or may correspond to, e.g., the i-th layer or i-th layer group. From the first layer to the last layer of the v layers, for the associated wideband SD bases vl, m or the value lN2O2+m may change monotonically as the layer index l increases. Merely by way of example, as the layer index l increases from the first layer to the last layer of the v layers, each term (lN2O2+m) may be equal to or greater than the previous term ( (l-1) N2O2+m) . As another example, as the layer index l increases from the first layer to the last layer of the v layers, each term (lN2O2+m) may be equal to or smaller than the previous term ( (l-1) N2O2+m) .
[0061] Figure 5 shows an example SD basis indication via a pair of oversampling indices (q1, q2) and a bitmap according to some embodiments of the disclosed technology. In the example, N1=4 , N2=2 , O1=O2=4 , and the length of the bitmap is N1N2=8. Each of the two N1O1×N2O2 arrays of boxes in Figure 5 illustrates a same master set of SD bases.
[0062] As a still further example, the wideband SD bases can be indicated by the PMI using a pair of oversampling indices (q1, q2) , a combinatorial number, and a permutational number. The oversampling indices (q1, q2) and the combinatorial number may determine selected wideband SD bases, and the permutational number may determine a mapping relationship between the selected wideband SD bases and the layers or layer groups.
[0063] In some embodiments, the wideband SD bases can be indicated by the PMI using at least one of: a wideband SD basis (or referred to as a reference wideband SD basis) , one or more wideband SD basis offsets, or a permutational number.
[0064] For example, L wideband SD bases can be indicated by one wideband SD basis (or referred to as a reference wideband SD basis) and (L-1) wideband SD basis offsets. From the first layer to the last layer of the v layers, for the associated wideband SD bases vl, m or (including the reference wideband SD basis and the remaining wideband SD bases indicated using the reference wideband SD basis and the wideband SD basis offsets) , the value lN2O2+m may change monotonically as the layer index l increases. Merely by way of example, as the layer index l increases from the first layer to the last layer of the v layers, each term (lN2O2+m) may be equal to or greater than the previous term ( (l-1) N2O2+m) . As another example, as the layer index l increases from the first layer to the last layer of the v layers, each term (lN2O2+m) may be equal to or smaller than the previous term ( (l-1) N2O2+m) .
[0065] As another example, the wideband SD bases can be indicated by the PMI using a wideband SD basis (or referred to as a reference wideband SD basis) , (L-1) wideband SD basis offsets, and a permutational number. The wideband SD basis and (L-1) wideband SD basis offsets may determine selected wideband SD bases, and the permutational number may determine the mapping relationship between the selected wideband SD bases and the layers or layer groups.
[0066] The reference wideband SD basis can be indicated by a pair of SD basis indices (l0, m0) . For example, l0 can belong to and m0 can belong to where (l0, m0) indicates SD basis As another example, l0 can belong to and m0 can belong to where (l0, m0) indicates SD basis Descriptions regarding N1, N2, O1, and O2 may be found elsewhere in the present document. For example, N1, N2, O1, and O2 may be integers configured with the CSI reporting configuration signaling. Y1 and Y2 may be two integers. For example, Y1 and Y2 can be predefined values (e.g., 1, 2, or 4) or a configurable parameter in the CSI reporting configuration signaling. The CSI reporting configuration signaling may be a higher layer parameter or an RRC parameter.
[0067] In some embodiments, a wideband SD basis offset can include two integers and i.e., Merely by way of example, the wideband SD bases indicated by one wideband SD basis and (L-1) wideband SD basis offsets can be:
[0068] or
[0069] In some embodiments, a wideband SD basis offset can be one integer ΔnWB. The integer ΔnWB may be determined by a pair of integers For example, Descriptions regarding N2 may be found elsewhere in the present document. For example, N2 may be an integer configured with the CSI reporting configuration signaling. Merely by way of example, the wideband SD bases indicated by one wideband SD basis and L-1 wideband SD basis offsets can be:
[0070] or
[0071] Figure 6 shows an example SD basis indication via a SD basis and a SD basis offset according to some embodiments of the disclosed technology. In the example, N1=4, N2=2, O1=O2=4, (l0, m0) = (4, 0) and The N1O1×N2O2 array of boxes in Figure 6 illustrates a master set of SD bases.
[0072] Embodiment 3: Subband SD bases reporting
[0073] The wideband SD bases (or one or more indicators of wideband SD bases) as disclosed herein can be subband specific or reported per subband (instead of wideband common or reported for a wideband) .
[0074] In some embodiments, in addition to the wideband SD bases (or one or more indicators of wideband SD bases) , the PMI can further include, for each subband, one or more subband SD basis offsets (or one or more indicators of subband SD basis offsets) . For example, for each subband, the precoding matrix of the v transmission layers of the PMI may be associated with L subband SD bases determined by L wideband SD bases (e.g., as described in Embodiment 2) and one or more subband SD basis offsets.
[0075] In some embodiments, the subband SD basis offsets can include at least one of: an oversampling index offset, or one or more orthogonal SD basis index offsets.
[0076] The oversampling index offset can include two integers The range of can be or The range of can be or As described elsewhere in the present document, O1 and O2 are oversampling factors defined in clause 5.2.2.2.1 of TS 38.214, the contents of which are incorporated herein by reference. In some embodiments, O1 and O2 may be configured with the CSI reporting configuration signaling.
[0077] An orthogonal SD basis index offset can include two integers or one integer ΔnSB determined by the pair of integers For example, The range of can be or The range of can be or As described elsewhere in the present document, N1 and N2 are defined in clause 5.2.2.2.1 of TS 38.214, the contents of which are incorporated herein by reference. In some embodiments, N1 and N2 may be configured with the CSI reporting configuration signaling.
[0078] For example, the subband SD basis offsets may include only one oversampling index offset for each subband. The subband SD bases corresponding to a subband can be determined by the wideband SD bases or and the oversampling index offset as:
[0079] or
[0080] where the i-th subband SD basis associated with the i-th layer or layer group is:
[0081] or
[0082] As another example, the subband SD basis offsets may include only one orthogonal SD basis index offset that includes two integers or one integer ΔnSB determined by two integers as for each subband. Descriptions regarding N2 may be found elsewhere in the present document. For example, N2 may be an integer configured with the CSI reporting configuration signaling. The subband SD bases corresponding to a subband can be determined by the wideband SD bases or and the orthogonal SD basis index offset as:
[0083] or
[0084] where the i-th subband SD basis associated with the i-th layer or layer group is:
[0085] or
[0086] As a further example, the subband SD basis offsets may include one oversampling index offset and one orthogonal SD basis index offset, for each subband. The subband SD bases can be determined by the wideband SD bases or the oversampling index offset, and the orthogonal SD basis index offset as:
[0087] or
[0088] where the i-th subband SD basis associated with the i-th layer or layer group is:
[0089] or
[0090] As a still further example, the subband SD basis offsets may include only multiple (L) orthogonal SD basis index offsets, i.e., or for each subband. The subband SD bases can be determined by the wideband SD bases or and the orthogonal SD basis index offsets as:
[0091] or
[0092] where the i-th subband SD basis associated with the i-th layer or layer group is:
[0093] or
[0094] As a still further example, the subband SD basis offsets may include a combination of one oversampling index offset and multiple (L) orthogonal SD basis index offsets, i.e., or for each subband. The subband SD bases can be determined by the wideband SD bases or the oversampling index offset, and the orthogonal SD basis index offsets as:
[0095] or
[0096] where the i-th subband SD basis associated with the i-th layer or layer group is:
[0097] or
[0098] Figure 7 shows an example subband SD basis indication according to some embodiments of the disclosed technology. In this example, the subband SD bases may be indicated by the PMI via wideband SD bases or an oversampling index offset, and orthogonal SD basis index offsets. N1=4, N2=2, O1=O2=4, and The N1O1×N2O2 array of boxes in Figure 7 illustrates a master set of SD bases.
[0099] In some embodiments, for each subband, the precoding matrix indicated by the PMI can be determined by the subband SD bases, where the subband SD bases may be determined by the wideband SD bases and the subband SD basis offsets. The number (or count) of the subband SD bases for a subband may be L = 1 or L = ceil (v / X) , where X is the number (or count) of layers in a layer group.
[0100] In some embodiments, X may be one. The number (or count) of wideband SD bases L =v, the precoding matrix or the codebook structure can be expressed in one of the following formulas:
[0101] or
[0102] where or is the subband SD basis associated with the i-th layer; and θp, i are the inter-polarization phase and inter-subarray phase associated with the i-th layer, respectively; and and θp, i can be layer common or layer specific. or may be determined according to, e.g., one or more of formula (27) , (28) , (31) , (32) , (35) , (36) , (39) , (40) , (43) , or (44) .
[0103] In some embodiments, X may be two. The number (or count) wideband SD bases L =ceil (v / 2) , the precoding matrix or the codebook structure can be expressed in one of the following formulas:
[0104] or
[0105] where the i-th layer group contains the (2i-1) -th layer, or the (2i-1) -th and 2i-th layers, is the subband SD bases associated with the i-th layer group, and θp, i are the inter-polarization phase and inter-subarray phase associated with the i-th layer group, respectively, and and θp, i can be layer group common or layer group specific.
[0106] or
[0107] where the i-th layer group contains the i-th layer, or the i-th and (L+i) -th layers, or is the subband SD basis associated with the i-th layer group; and θp, i are the inter-polarization phase and inter-subarray phase associated with the i-th layer group, respectively; and and θp, i can be layer group common or layer group specific. or may be determined according to, e.g., one or more of formula (27) , (28) , (31) , (32) , (35) , (36) , (39) , (40) , (43) , or (44) .
[0108] In some embodiments, X may be four. The number of wideband SD bases L = ceil (v / 4) . If the number of layers v=8, the precoding matrix or the codebook structure can be expressed in the following formula:
[0109] where the first layer group contains the 1st to 4th layers; the second layer group contains the 5th to 8th layers; is the subband SD basis associated with the i-th layer group; and θp, i are the inter-polarization phase and inter-subarray phase associated with the i-th layer group, respectively. and θp, i can be layer group common or layer group specific. If the number of layers v is smaller than 8, the indicated v-layer precoding matrix only include the first v column vectors in the above formula (50) . may be determined according to, e.g., one or more of formula (28) , (32) , (36) , (40) , or (44) .
[0110] One or more features of various embodiments disclosed herein can be combined in implementations. For example, the vector wi formula (6) in Embodiment 1 can be equivalent to the i-th column vector of the precoding matrix W in Embodiment 2 and / or Embodiment 3. The i-th column vector of the precoding matrix W in Embodiment 2 and / or Embodiment 3 may include an amplitude as described in Embodiment 1.
[0111] Some embodiments may implement one or more of the following solutions, listed in clause-format. The following clauses are supported and further described in the embodiments above and throughout this document. As used in the clauses below and in the claims, a wireless device may be user equipment, mobile station, or any other wireless terminal including fixed nodes such as base stations. A network device includes a base station including a next generation Node B (gNB) , enhanced Node B (eNB) , or any other device that performs as a base station. The following listing of solutions may be implemented by some preferred embodiments.
[0112] Solution 1. A method (e.g., method 800 as shown in Figure 8) of wireless communication, comprising: receiving (810) , at a wireless device from a network device, a reference signal (RS) for channel measurement and channel state information (CSI) reporting configuration signaling; determining (820) , by the wireless device, CSI based on the RS and the CSI reporting configuration, wherein the CSI comprises a precoding matrix indicator (PMI) indicating a v-layer precoding matrix for v transmission layers, and transmitting (830) , from the wireless device to the network device, the CSI.
[0113] Solution 2. A method (e.g., method 900 as shown in Figure 9) of wireless communication, comprising: transmitting (910) , by a network device to a wireless device, a reference signal (RS) for channel measurement and channel state information (CSI) reporting configuration signaling; and receiving (920) , at the network device from the wireless device, CSI determined based on the RS and the CSI reporting configuration, wherein the CSI comprises a precoding matrix indicator (PMI) indicating a v-layer precoding matrix for v transmission layers.
[0114] Solution 3. The method of any one or more of the solutions disclosed herein, wherein the PMI comprises inter-layer amplitudes for the v transmission layers or one or more indicators of the respective inter-layer amplitudes.
[0115] Solution 4. The method of any one or more of the solutions disclosed herein, wherein the inter-layer amplitudes are normalized.
[0116] Solution 5. The method of any one or more of the solutions disclosed herein, wherein the inter-layer amplitudes are normalized with a maximum amplitude of the v transmission layers.
[0117] Solution 6. The method of any one or more of the solutions disclosed herein, wherein the maximum amplitude corresponds to a boundary transmission layer of the v transmission layers.
[0118] Solution 7. The method of any one or more of the solutions disclosed herein, wherein the maximum amplitude is not included in the PMI.
[0119] Solution 8. The method of any one or more of the solutions disclosed herein wherein the inter-layer amplitudes are arranged in the PMI in a same order as their corresponding transmission layers.
[0120] Solution 9. The method of any one or more of the solutions disclosed herein, wherein the inter-layer amplitudes are arranged in the PMI in a monotonically increasing or decreasing order.
[0121] Solution 10. The method of any one or more of the solutions disclosed herein, wherein whether the PMI includes the inter-layer amplitudes or the one or more indicators of the respective inter-layer amplitudes is determined based on at least one of: a configurable parameter in the CSI reporting configuration signaling, or a capacity of the wireless device.
[0122] Solution 11. The method of any one or more of the solutions disclosed herein, wherein the PMI comprises a set of L spatial domain (SD) bases, or one or more indicators of the respective L SD bases; wherein L equals to 1 or ceil (v / X) , wherein X is a count of layers in a layer group; and wherein a precoding matrix of each transmission layer group comprising X or fewer transmission layers of the v transmission layers is associated with one SD basis of the L SD bases.
[0123] Solution 12. The method of any one or more of the solutions disclosed herein, wherein the set of L SD bases is common over a wideband and reported once for the wideband, or subband specific and per subband reported.
[0124] Solution 13. The method of any one or more of the solutions disclosed herein, wherein the set of L SD bases are indicated using at least one of: a pair of integers (q1, q2) , a bitmap, a combinatorial number, or a permutational number.
[0125] Solution 14. The method of any one or more of the solutions disclosed herein, wherein the integers 1ōq1ōO1 -1, 1ōq2ōO2 -1, and wherein O1 and O2 are two integers configured with the CSI reporting configuration signaling.
[0126] Solution 15. The method of any one or more of the solutions disclosed herein, wherein a length of the bitmap is N1N2 or N1N2 / 2, wherein N1 and N2 are two integers configured with the CSI reporting configuration signaling; and wherein a (aN2+b+1) th bit in the bitmap is associated with a SD basis with indices (aN1+q1, bN2+q2) , wherein 0≤a≤N1-1, 0≤b≤N2-1.
[0127] Solution 16. The method of any one or more of the solutions disclosed herein, wherein a bit in the bitmap set to one indicates that an associated SD basis is included in the L SD bases.
[0128] Solution 17. The method of any one or more of the solutions disclosed herein, wherein the set of L SD bases are indicated using at least one of: a reference SD basis, one or more SD basis offsets, or a permutational number.
[0129] Solution 18. The method of any one or more of the solutions disclosed herein, wherein the reference SD basis is indicated by a pair of indices (l0, m0) ; wherein or wehrein or and wherein N1, N2, O1, and O2 are integers configured with the CSI reporting configuration signaling, and Y1 and Y2 are two integers.
[0130] Solution 19. The method of any one or more of the solutions disclosed herein, wherein a count of the one or more SD basis offsets is L-1; and wherein each of the L-1 SD basis offsets comprises a pair of integers or an integer determined by the pair of integers in which N2 is an integer configured with the CSI reporting configuration signaling.
[0131] Solution 20. The method of any one or more of the solutions disclosed herein, wherein indices of the set of L SD bases are determined by the pair of indices (l0, m0) and L-1 pairs of integers as wherein are the ith pair of the integers O1 and O2 are two integers configured with the CSI reporting configuration signaling.
[0132] Solution 21. The method of any one or more of the solutions disclosed herein, wherein a precoding matrix of each transmission layer l of the v transmission layers is associated with one SD basis with indices (l, m) of the L SD bases; and wherein lN2O2+m increases or decreases monotonically as the layer index l of the transmission layer increases.
[0133] Solution 22. The method of any one or more of the solutions disclosed herein, wherein the PMI further comprises one or more subband SD basis offsets or one or more indicators of the respective subband SD basis offsets; and wherein the one or more subband SD basis offsets or one or more indicators of the respective SD basis offsets are per subband reported.
[0134] Solution 23. The method of any one or more of the solutions disclosed herein, wherein for each subband, the v-layer precoding matrix of the v transmission layers is associated with L subband SD bases determined by the L SD bases and the one or more subband SD basis offsets.
[0135] Solution 24. The method of any one or more of the solutions disclosed herein, wherein the one or more subband SD basis offsets comprise at least one of: (a) a pair of integers wherein wherein O1 and O2 are two integers configured with the CSI reporting configuration signaling; (b) one or more pairs of integers or (c) one or more integers ΔnSB, wherein each of the one or more integer ΔnSB is determined by a pair of integers as in which N2 is an integer configured with the CSI reporting configuration signaling.
[0136] Solution 25. The method of any one or more of the solutions disclosed herein, wherein the one or more subband SD basis offsets comprise only one pair of integers and wherein indices of the L subband SD bases are determined based on at least one of the following: (i) indices of the L SD bases or (ii) the pair of integers See, e.g., one or more of formulas (25) - (28) .
[0137] Solution 26. The method of any one or more of the solutions disclosed herein, wherein the one or more subband SD basis offsets comprise one pair of integers and one pair of integers and wherein indices of the L subband SD bases are determined based on at least one of the following: (i) indices of the L SD bases (ii) the pair of integers (iii) the pair of integers or (iv) O1 and O2, wherein O1 and O2 are two integers configured with the CSI reporting configuration signaling. See, e.g., one or more of formulas (33) - (36) .
[0138] Solution 27. The method of any one or more of the solutions disclosed herein, wherein the one or more subband SD basis offsets comprise one pair of integers and L pairs of integers and wherein indices of the L subband SD bases are determined based on at least one of the following: (i) indices of the L SD bases (ii) the pair of integers (iii) the L pairs of integers or (iv) O1 and O2, wherein O1 and O2 are two integers configured with the CSI reporting configuration signaling. See, e.g., one or more of formulas (41) - (44) .
[0139] Solution 28. A wireless communication device, comprising: at least one processor configured to perform the method of any one or more of the solutions disclosed herein.
[0140] Solution 29. One or more non-transitory computer-readable media storing computer-executable instructions that, when executed by one or more processors of a wireless communication device, cause the device to perform the method of any one or more of the solutions disclosed herein.
[0141] It will be appreciated that the present document discloses techniques that can be embodied in various embodiments to allow a UE-triggered reporting of beam report information. Specifically, events for beam reporting are defined based on measurement quality variation monitoring among beams at different time instances / beam groups or for different channels / RSs. The beam reporting would be triggered if any of the pre-defined events occurs. As the event-triggered beam report is initiated by the UE on demand, the reporting latency and uplink reporting resource consumption can be greatly reduced compared with the conventional beam report method.
[0142] The disclosed and other embodiments, modules and the functional operations described in this document can be implemented in digital electronic circuitry, or in computer software, firmware, or hardware, including the structures disclosed in this document and their structural equivalents, or in combinations of one or more of them. The disclosed and other embodiments can be implemented as one or more computer program products, i.e., one or more modules of computer program instructions encoded on a computer readable medium for execution by, or to control the operation of, data processing apparatus. The computer readable medium can be a machine-readable storage device, a machine-readable storage substrate, a memory device, a composition of matter effecting a machine-readable propagated signal, or a combination of one or more them. The term “data processing apparatus” encompasses all apparatus, devices, and machines for processing data, including by way of example a programmable processor, a computer, or multiple processors or computers. The apparatus can include, in addition to hardware, code that creates an execution environment for the computer program in question, e.g., code that constitutes processor firmware, a protocol stack, a database management system, an operating system, or a combination of one or more of them. A propagated signal is an artificially generated signal, e.g., a machine-generated electrical, optical, or electromagnetic signal, that is generated to encode information for transmission to suitable receiver apparatus.
[0143] A computer program (also known as a program, software, software application, script, or code) can be written in any form of programming language, including compiled or interpreted languages, and it can be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment. A computer program does not necessarily correspond to a file in a file system. A program can be stored in a portion of a file that holds other programs or data (e.g., one or more scripts stored in a markup language document) , in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files that store one or more modules, sub programs, or portions of code) . A computer program can be deployed to be executed on one computer or on multiple computers that are located at one site or distributed across multiple sites and interconnected by a communication network.
[0144] The processes and logic flows described in this document can be performed by one or more programmable processors executing one or more computer programs to perform functions by operating on input data and generating output. The processes and logic flows can also be performed by, and apparatus can also be implemented as, special purpose logic circuitry, e.g., an FPGA (field programmable gate array) or an ASIC (application specific integrated circuit) .
[0145] Processors suitable for the execution of a computer program include, by way of example, both general and special purpose microprocessors, and any one or more processors of any kind of digital computer. Generally, a processor will receive instructions and data from a read only memory or a random-access memory or both. The essential elements of a computer are a processor for performing instructions and one or more memory devices for storing instructions and data. Generally, a computer will also include, or be operatively coupled to receive data from or transfer data to, or both, one or more mass storage devices for storing data, e.g., magnetic, magneto optical disks, or optical disks. However, a computer need not have such devices. Computer readable media suitable for storing computer program instructions and data include all forms of non-volatile memory, media and memory devices, including by way of example semiconductor memory devices, e.g., EPROM, EEPROM, and flash memory devices; magnetic disks, e.g., internal hard disks or removable disks; magneto optical disks; and CD ROM and DVD-ROM disks. The processor and the memory can be supplemented by, or incorporated in, special purpose logic circuitry.
[0146] Some of the embodiments described herein are described in the general context of methods or processes, which may be implemented in one embodiment by a computer program product, embodied in a computer-readable medium, including computer-executable instructions, such as program code, executed by computers in networked environments. A computer-readable medium may include removable and non-removable storage devices including, but not limited to, Read Only Memory (ROM) , Random Access Memory (RAM) , compact discs (CDs) , digital versatile discs (DVD) , etc. Therefore, the computer-readable media can include a non-transitory storage media. Generally, program modules may include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. Computer-or processor-executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.
[0147] Some of the disclosed embodiments can be implemented as devices or modules using hardware circuits, software, or combinations thereof. For example, a hardware circuit implementation can include discrete analog and / or digital components that are, for example, integrated as part of a printed circuit board. Alternatively, or additionally, the disclosed components or modules can be implemented as an Application Specific Integrated Circuit (ASIC) and / or as a Field Programmable Gate Array (FPGA) device. Some implementations may additionally or alternatively include a digital signal processor (DSP) that is a specialized microprocessor with an architecture optimized for the operational needs of digital signal processing associated with the disclosed functionalities of this application. Similarly, the various components or sub-components within each module may be implemented in software, hardware or firmware. The connectivity between the modules and / or components within the modules may be provided using any one of the connectivity methods and media that is known in the art, including, but not limited to, communications over the Internet, wired, or wireless networks using the appropriate protocols.
[0148] While this document contains many specifics, these should not be construed as limitations on the scope of an invention that is claimed or of what may be claimed, but rather as descriptions of features specific to particular embodiments. Certain features that are described in this document in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable sub-combination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some implementations be excised from the combination, and the claimed combination may be directed to a sub-combination or a variation of a sub-combination. Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results.
[0149] Only a few implementations and examples are described and other implementations, enhancements and variations can be made based on what is described and illustrated in this disclosure.
Claims
1.A method of wireless communication, comprising:receiving, at a wireless device from a network device, a reference signal (RS) for channel measurement and a channel state information (CSI) reporting configuration signaling;determining, by the wireless device, CSI based on the RS and the CSI reporting configuration signaling, wherein the CSI comprises a precoding matrix indicator (PMI) indicating a v-layer precoding matrix for v transmission layers, andtransmitting, from the wireless device to the network device, the CSI.2.A method of wireless communication, comprising:transmitting, by a network device to a wireless device, a reference signal (RS) for channel measurement and a channel state information (CSI) reporting configuration signaling; andreceiving, at the network device from the wireless device, CSI determined based on the RS and the CSI reporting configuration signaling, wherein the CSI comprises a precoding matrix indicator (PMI) indicating a v-layer precoding matrix for v transmission layers.3.The method of claim 1 or claim 2, wherein the PMI comprises inter-layer amplitudes for the v transmission layers or one or more indicators of the respective inter-layer amplitudes.4.The method of claim 3, wherein the inter-layer amplitudes are normalized.5.The method of claim 4, wherein the inter-layer amplitudes are normalized with a maximum amplitude of the v transmission layers.6.The method of claim 5, wherein the maximum amplitude corresponds to a boundary transmission layer of the v transmission layers.7.The method of claim 5, wherein the maximum amplitude is not included in the PMI.8.The method of claim 3, wherein the inter-layer amplitudes are arranged in the PMI in a same order as their corresponding transmission layers.9.The method of claim 3, wherein the inter-layer amplitudes are arranged in the PMI in a monotonically increasing or decreasing order.10.The method of claim 3, wherein whether the PMI includes the inter-layer amplitudes or the one or more indicators of the respective inter-layer amplitudes is determined based on at least one of: a configurable parameter in the CSI reporting configuration signaling, or a capacity of the wireless device.11.The method of claim 1 or claim 2,wherein the PMI comprises a set of L spatial domain (SD) bases, or one or more indicators of the respective L SD bases;wherein L equals to 1 or ceil (v / X) , wherein X is a count of layers in a layer group; andwherein a precoding matrix of each transmission layer group comprising X or fewer transmission layers of the v transmission layers is associated with one SD basis of the L SD bases.12.The method of claim 11, wherein the set of L SD bases is common over a wideband and reported once for the wideband, or subband specific and per subband reported.13.The method of claim 11, wherein the set of L SD bases are indicated using at least one of: a pair of integers (q1, q2) , a bitmap, a combinatorial number, or a permutational number.14.The method of claim 13, wherein the integers 1≤q1≤O1 -1, 1≤q2≤O2 -1, wherein O1 and O2 are two integers configured with the CSI reporting configuration signaling.15.The method of claim 13,wherein a length of the bitmap is N1N2 or N1N2 / 2, wherein N1 and N2 are two integers configured with the CSI reporting configuration signaling; andwherein a (aN2+b+1) th bit in the bitmap is associated with a SD basis with indices (aN1+q1, bN2+q2) , wherein 0≤a≤N1-1, 0≤b≤N2-1.16.The method of claim 15, wherein a bit in the bitmap set to one indicates that an associated SD basis is included in the L SD bases.17.The method of claim 11, wherein the set of L SD bases are indicated using at least one of: a reference SD basis, one or more SD basis offsets, or a permutational number.18.The method of claim 17,wherein the reference SD basis is indicated by a pair of indices (l0, m0) ;whereinorwhereinorandwherein N1, N2, O1, and O2 are integers configured with the CSI reporting configuration signaling, and Y1 and Y2 are two integers.19.The method of claim 17,wherein a count of the one or more SD basis offsets is L-1; andwherein each of the L-1 SD basis offsets comprises a pair of integersor an integerdetermined by the pair of integersin which N2 is an integer configured with the CSI reporting configuration signaling.20.The method of any one of claims 17-19, wherein indices of the set of L SD bases are determined by the pair of indices (l0, m0) and L-1 pairs of integers as whereinare the ith pair of the integersO1 and O2 are two integers configured with the CSI reporting configuration signaling.21.The method of any one of claims 11-20,wherein a precoding matrix of each transmission layer l of the v transmission layers is associated with one SD basis with indices (l, m) of the L SD bases; andwherein lN2O2+m increases or decreases monotonically as the layer index l of the transmission layer increases.22.The method of claim 11:wherein the PMI further comprises one or more subband SD basis offsets or one or more indicators of the respective subband SD basis offsets; andwherein the one or more subband SD basis offsets or one or more indicators of the respective SD basis offsets are per subband reported.23.The method of claim 22, wherein for each subband, the v-layer precoding matrix of the v transmission layers is associated with L subband SD bases determined by the L SD bases and the one or more subband SD basis offsets.24.The method of claim 23, wherein the one or more subband SD basis offsets comprise at least one of:(a) a pair of integerswhereinwherein O1 and O2 are two integers configured with the CSI reporting configuration signaling;(b) one or more pairs of integersor(c) one or more integers ΔnSB, wherein each of the one or more integer ΔnSB is determined by a pair of integersasin which N2 is an integer configured with the CSI reporting configuration signaling.25.The method of claim 24,wherein the one or more subband SD basis offsets comprise only one pair of integers andwherein indices of the L subband SD basesare determined based on at least one of the following:(i) indices of the L SD basesor(ii) the pair of integers26.The method of claim 24,wherein the one or more subband SD basis offsets comprise one pair of integersand one pair of integersandwherein indices of the L subband SD basesare determined based on at least one of the following:(i) indices of the L SD bases(ii) the pair of integers(iii) the pair of integersor(iv) O1 and O2, wherein O1 and O2 are two integers configured with the CSI reporting configuration signaling.27.The method of claim 24,wherein the one or more subband SD basis offsets comprise one pair of integersand L pairs of integersandwherein indices of the L subband SD basesare determined based on at least one of the following:(i) indices of the L SD bases(ii) the pair of integers(iii) the L pairs of integersor(iv) O1 and O2, wherein O1 and O2 are two integers configured with the CSI reporting configuration signaling.28.A wireless communication device, comprising: at least one processor configured to perform the method of any one of claims 1-27.29.One or more non-transitory computer-readable media storing computer-executable instructions that, when executed by one or more processors of a wireless communication device, cause the device to perform the method of any one of claims 1-27.
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