Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B7/00—Radio transmission systems, i.e. using radiation field
  • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
  • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
  • H04B7/0413—MIMO systems
  • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
  • H04B7/0478—Special codebook structures directed to feedback optimisation
  • H04B7/048—Special codebook structures directed to feedback optimisation using three or more PMIs

Definitions

• a wireless communication device e.g., UE
• the wireless communication device can filter the first kind of bases based on a first condition.
• the wireless communication device can separate information about the first kind of combination coefficients into a first block and a second block based on a first message and a second condition.
• the wireless communication device can process information in the first block and the second block using a wideband feedback mode and a subband feedback mode, respectively.
• the wireless communication device can transform the first kind of combination coefficients into a second space represented by a second kind of bases and a second kind of combination coefficients.
• the wireless communication device can filter the second kind of bases on a third condition.
• the wireless communication device can determine the second condition based on the filtered second kind of bases.
• FIG. 3 illustrates an example flow diagram for a first CSI feedback implementation, in accordance with some embodiments of the present disclosure
• FIG. 4 illustrates an example flow diagram for a second CSI feedback implementation, in accordance with some embodiments of the present disclosure
• FIG. 5 illustrates an example flow diagram for a third CSI feedback implementation, in accordance with some embodiments of the present disclosure.
• Such an example network 100 includes a base station 102 (hereinafter “BS 102” ; also referred to as wireless communication node) and a user equipment device 104 (hereinafter “UE 104” ; also referred to as wireless communication device) that can communicate with each other via a communication link 110 (e.g., a wireless communication channel) , and a cluster of cells 126, 130, 132, 134, 136, 138 and 140 overlaying a geographical area 101.
• the BS 102 and UE 104 are contained within a respective geographic boundary of cell 126.
• Each of the other cells 130, 132, 134, 136, 138 and 140 may include at least one base station operating at its allocated bandwidth to provide adequate radio coverage to its intended users.
• the BS 102 may operate at an allocated channel transmission bandwidth to provide adequate coverage to the UE 104.
• the BS 102 and the UE 104 may communicate via a downlink radio frame 118, and an uplink radio frame 124 respectively.
• Each radio frame 118/124 may be further divided into sub-frames 120/127 which may include data symbols 122/128.
• the BS 102 and UE 104 are described herein as non-limiting examples of “communication nodes, ” generally, which can practice the methods disclosed herein. Such communication nodes may be capable of wireless and/or wired communications, in accordance with various embodiments of the present solution.
• FIG. 2 illustrates a block diagram of an example wireless communication system 200 for transmitting and receiving wireless communication signals (e.g., OFDM/OFDMA signals) in accordance with some embodiments of the present solution.
• the system 200 may include components and elements configured to support known or conventional operating features that need not be described in detail herein.
• system 200 can be used to communicate (e.g., transmit and receive) data symbols in a wireless communication environment such as the wireless communication environment 100 of FIG. 1, as described above.
• the memory modules 216 and 234 may also be integrated into their respective processor modules 210 and 230.
• the memory modules 216 and 234 may each include a cache memory for storing temporary variables or other intermediate information during execution of instructions to be executed by processor modules 210 and 230, respectively.
• Memory modules 216 and 234 may also each include non-volatile memory for storing instructions to be executed by the processor modules 210 and 230, respectively.
• the network communication module 218 generally represents the hardware, software, firmware, processing logic, and/or other components of the base station 202 that enable bi-directional communication between base station transceiver 210 and other network components and communication nodes configured to communication with the base station 202.
• network communication module 218 may be configured to support internet or WiMAX traffic.
• network communication module 218 provides an 802.3 Ethernet interface such that base station transceiver 210 can communicate with a conventional Ethernet based computer network.
• the network communication module 218 may include a physical interface for connection to the computer network (e.g., Mobile Switching Center (MSC) ) .
• MSC Mobile Switching Center
• a third layer may be a Radio Link Control (RLC) layer.
• a fourth layer may be a Packet Data Convergence Protocol (PDCP) layer.
• PDCP Packet Data Convergence Protocol
• a fifth layer may be a Radio Resource Control (RRC) layer.
• a sixth layer may be a Non Access Stratum (NAS) layer or an Internet Protocol (IP) layer, and the seventh layer being the other layer.
• NAS Non Access Stratum
• IP Internet Protocol
• CSI Channel State Information
• FDD Frequency Division Duplex
• MIMO Multiple-Input-Multiple-Output
• an extremely large-scale multiple-input-multiple-output may be utilized for its performances in spectral efficiency (SE) , energy efficiency (EE) , and/or access for devices.
• distributed massive MIMO e.g., sometimes referred to or known as an advanced MIMO technology
• SE spectral efficiency
• EE energy efficiency
• CSI feedback may be a bottleneck for certain systems, such as an FDD system, to leverage the benefit of massive MIMO technology.
• the systems and methods of the technical solution discussed herein can provide various configurations for an enhanced efficient CSI feedback configuration, such as compared to subband-based CSI feedback, for XL-MIMO, among other types of technologies.
• the BS 102 (e.g., wireless communication node, gNB, or TRP) can configure/set/modify one or more parameters for indicating a number of a first kind of bases (e.g., space bases for an antenna array) for each CSI feedback mode (e.g., methods or mechanisms for reporting or communicating the CSI between the UE 104 and the BS 102) .
• the BS 102 can transmit/send/communicate the one or more parameters (e.g., as part of a message, such as a first message) to the UE 104 via at least one type of signaling.
• the BS 102 can inform/notify the UE 104 of various parameters, for instance, at least two out of three parameters (e.g., L, the total number of the selected first kind of bases, L WB the number of the selected first kind of bases for wideband feedback, and L SB , the number of the selected first kind of bases for subband feedback) , where L can correspond to the sum of L WB and L SB .
• L the total number of the selected first kind of bases
• L WB the number of the selected first kind of bases for wideband feedback
• L SB the number of the selected first kind of bases for subband feedback
• the BS 102 can transmit the one or more parameters to the UE 104 via at least one signaling.
• the UE 104 can receive/obtain/acquire the one or more parameters as part of a message (e.g., the first message) from the BS 102 (e.g., determined based on at least one signaling from the BS 102) .
• FIG. 3 shows an example flow diagram 300 for a first CSI feedback implementation, in accordance with some embodiments of the present disclosure.
• the UE 104 can transform/change the channel response (e.g., a matrix including a derived or estimated channel frequency response over an assigned bandwidth, such as frequency bandwidth, for each available antenna pair from the BS 102 to the UE 104) to a first kind of bases and/or a first kind of combination coefficients (e.g., sometimes referred to generally as coefficients) .
• the first kind of bases and/or the first kind of combination coefficients can represent or be a part of a first space.
• the UE 104 can perform the transformation of the channel response to the first kind of bases and/or the the first kind of combination coefficients using a transformer (e.g., a first transformer) .
• the UE 104 can select at least a part of the first kind of bases (e.g., L of the first kind of bases with the strongest/highest magnitudes) by using a basis filter according to at least one of the first kind of bases and/or the first kind of combination coefficients (e.g., output from the first transformer) and/or other information, such as L WB and L SB .
• the UE 104 can determine the (e.g., compression) feedback mode of the first kind of combination coefficients associated with the selected first kind of bases, such as the selected first kind of bases from the basis filter.
• the number of the first kind of bases for wideband feedback (e.g., wideband feedback mode) and subband feedback (e.g., subband feedback mode) can correspond to or be represented as L WB and L SB , respectively.
• the UE 104 may separate the combination coefficients (e.g., the first kind of the combination coefficients, among other kinds of combination coefficients) accordingly.
• the combination coefficients can be delivered/provided/inserted into a first block for a second transformation (e.g., using a transformer) and quantization (e.g., using a quantizer, such as for wideband feedback) .
• the combination coefficients may be delivered into a second block for quantization (e.g., using a quantizer, such as for subband feedback) .
• a correlation degree/magnitude/level of a first kind of combination coefficients associated with a first kind of bases may be a part of the separation criteria for the UE 104.
• the correlation degree can be measured/determined/computed based on or according to a ratio between the maximal/largest/greatest and average magnitudes of the combination coefficients.
• the correlation degree may be measured according to the number of a second kind of bases with magnitudes of a second kind of combination coefficients being greater/larger than a threshold (e.g., a first threshold) .
• the second kind of bases and/or the second kind of combination coefficients may be derived/determined/identified from transforming the first kind of combination coefficients.
• the UE 104 can use a transformer (e.g., the second transformer) to reduce/compress/shrink the dimension of the combination coefficients (e.g., transform the combination coefficients) .
• the UE 104 can determine or identify the indices of the selected first kind of bases and/or coefficients in the first block and/or the second block (e.g., indices of amplitude and phase) , such as for CSI feedback (e.g., bits for transmission to the BS 102) .
• the CSI feedback can be a part of or correspond to a message (e.g., a second message) transmitted by the UE 104 to the BS 102.
• FIG. 4 shows an example flow diagram 400 for a second CSI feedback implementation, in accordance with some embodiments of the present disclosure.
• the second CSI feedback implementation may include various operations or features similar to the first CSI feedback implementation, such as in the example flow diagram 300 of FIG. 3.
• the UE 104 may include or add at least one transformer (e.g., a third transformer) to perform a transformation after the selection of at least a part of the first kind of bases (e.g., using the basis filter) and before determining the feedback mode (e.g., the feedback mode determiner) .
• at least one transformer e.g., a third transformer
• the UE 104 can use the third transformer for transforming/changing (or generating) the first kind of combination coefficients into a second kind of bases and/or a second kind of combination coefficients.
• the feedback mode associated with one of or a part of the selected first kind of bases may be determined by, according to, or based on the corresponding second kind of combination coefficients.
• the feedback mode associated with one of the selected first kind of bases can be selected/identified/determined (e.g., by the UE 104) as the wideband feedback mode, such as when or if the number of the second kind of bases with magnitudes of the corresponding second kind of combination coefficients larger/greater than the threshold (e.g., a third threshold) is less/fewer than or equal to another threshold (e.g., a second threshold) . Otherwise, if the number of the second kind of bases with magnitudes of the corresponding second kind of combination coefficients larger/greater than the threshold is greater/larger than another threshold, the UE 104 can determine or select the subband feedback mode as the feedback mode (e.g., using the feedback mode determiner) .
• the threshold e.g., a third threshold
• another threshold e.g., a second threshold
• the UE 104 can process the second kind of combination coefficients via the first block or the second block to determine or identify the indices of amplitude and phase for the CSI feedback.
• the UE 104 can include the indices as part of the second message for transmission/reporting to the BS 102.
• FIG. 5 shows an example flow diagram 500 for a third CSI feedback implementation, in accordance with some embodiments of the present disclosure.
• the third CSI feedback implementation may include various operations or features similar to at least one of the first CSI feedback implementation and/or the second CSI feedback implementation, such as described in conjunction with the example flow diagrams 300, 400 of FIGS. 3-4.
• the UE 104 may deliver/provide the first kind of combination coefficients to the first block if the UE 104 determines or selects the wideband feedback mode as the feedback mode according to information about/regarding the second kind of bases (e.g., from the feedback mode determiner) .
• the UE 104 can feed/deliver the first kind of combination coefficients to the feedback mode determiner.
• the UE 104 can provide the second kind of bases and/or the second kind of combination coefficients to the feedback mode determiner.
• the UE 104 determines the wideband feedback mode as the feedback mode, the UE 104 (e.g., the feedback mode determiner) can forward or deliver the first kind of combination coefficients to the first block for wideband feedback. Otherwise, if the UE 104 determines the subband feedback mode as the feedback mode, the UE 104 can deliver the second kind of combination coefficients for subband feedback. Responsive to processing the first kind of combination coefficients in the first block and/or processing the second kind of combination coefficients in the second block, the UE 104 can determine the respective indices of amplitude and phase for CSI feedback to the BS 102.
• V matrix of H the unitary matrix on the right of the singular value decomposition of H
• H the single value decomposition of H
• Q, V, and S can respectively be the orthogonal unitary matrices, and the diagonal matrix.
• W 1 and W 2 can be specified by or described as for instance follows:
• vector groups can be used for defining or redefining a 1 ( ⁇ l ) and such as the following:
• C (x, y) can be provided/given in the example Table 1-1, and/or example values of respective parameters (e.g., L, L WB , M, N 1 , N 2 , etc. ) can be provided in example Table 1-2.
• Example Table 1-1 an example of combination coefficients C (x, y)
• Example Table 1-2 example parameter configuration
• the quantization burden may be reduced/lightened/minimized by expressing or utilizing the following coefficient vector p in various dual-polarization configurations:
• a first L elements (e.g., a first number of elements) of p may correspond to or be used for
• k′ [k′ 0 , k′ 1 , ..., k′ 2L-1 ]
• k′ i ⁇ ⁇ 0, 1, ...7 ⁇ k′′ [k" 0 , k
• mapping relationships such as the mapping relationships of f 1 and f 2 , can be described, shown, or presented respectively in example Table 1-3 and example Table 1-4.
• Example Table 1-3 an example of mapping f 1 from k′ i to p′ i
• Example Table 1-4 an example of mapping f 2 from k′′ i to p′′ i
• the N PSK of the piece-wise function of c i can be a configurable parameter.
• the amplitude of the subband e.g., subbandAmplitude
• ‘FALSE’ e.g., the UE 104 is not required to perform amplitude feedback per subband
• Parameter K can be associated with parameter L, such as in but not limited to the following example:
• the formula (1-1) can be simplified to the following example formula (1-2) for determining the channel response matrix H.
• the UE 104 can find/identify L space bases and the corresponding coefficients. If wideband feedback (mode) is enabled for one space bases, the UE 104 may report/provide/indicate relatively fewer/less quantization bits compared to the subband feedback (mode) for allocated subbands.
• mode wideband feedback
• Various approaches e.g., underlying approaches to fulfilling/satisfying/meeting the conditions discussed herein can include/involve the reduction of the number of coefficients, (e.g., confining to) amplitude/phase quantization of coefficients, coefficient amplitude and/or phase quantization using a relatively smaller-size look-up-table, and/or combination of multiple categories of approaches or techniques.
• the coefficients may refer to bases coefficients or a variant derived from a transformation to bases coefficients over one or more subbands.
• the UE 104 may transform the elements of the ith row of into a Z-element vector based on or according to the relationship
• U may be an 1 ⁇ M matrix with M′ (M′ ⁇ M) nonzero element 1/M′. In some cases, U may be a Z ⁇ M matrix with one or more nonzero elements.
• the BS 102 can inform/notify/indicate to the UE 104 of parameters related to CSI feedback (e.g., parameters in the example Table 1-2) , such as via a first message.
• a subset of can be used to form/generate/create a new Table, e.g., form example Table 1-5 and/or Table 1-6, such as for amplitude quantization.
• Example Table 1-5 an example of a look-up-table for mapping f′ 1 from k′ z to p′ i (1-bit for two terms)
• Example Table 1-6 an example of a look-up-table for mapping f′ 2 from k" z to p′ i (2-bits for four terms)
• k" “ may be obtained/taken from a subset of the set ⁇ 0, 1, ..., 7 ⁇ predetermined for k′ i , such as ⁇ 0, 7 ⁇ , ⁇ 0, 5, 7 ⁇ , ⁇ 0, 3, 5, 7 ⁇ , ⁇ 0, 2, 4, 6, 7 ⁇ , etc.
• k′ z or k" z may be available under a minimum distance criteria, e.g., or The symbol
• can represent a norm operator, e.g., 2-norm.
• the UE 104 can quantize the phase of by identifying/obtaining/finding a desired/appropriate c z of minimizing The mapping of f′ and can be to identify the amplitude and phase quantization of such as for further decreasing feedback bits.
• K V strongest ones (e.g., coefficients) of non-zero elements of can be quantized using the example Table 1-3 or the example Table 1-6
• Z-K V weakest elements (e.g., coefficients) of can be quantized using the example Table 1-4 or the example Table 1-5 for example.
• each coefficient corresponding to or with the subband feedback mode can be independently quantized using the mapping f 1 or f 2 , and ⁇ 1 .
• H W 1 ⁇ W′ 2 ⁇ W 3
• the W 3 can include or indicate complete DFT bases for frequency domain.
• W 3 can correspond to or be determined as follows:

Landscapes

• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Mobile Radio Communication Systems (AREA)

Applications Claiming Priority (1)

Publications (2)

Family

ID=93431858

Family Applications (1)

Country Status (3)

Family Cites Families (5)

• 2023
  • 2023-07-07 EP EP23936276.7A patent/EP4627728A4/de active Pending
  • 2023-07-07 WO PCT/CN2023/106419 patent/WO2024229969A1/en not_active Ceased
  • 2023-07-07 CN CN202380088891.8A patent/CN120419108A/zh active Pending

Also Published As

Similar Documents

Legal Events