WO2020010506A1 - 上报信道状态信息的方法和装置 - Google Patents
上报信道状态信息的方法和装置 Download PDFInfo
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- H—ELECTRICITY
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- 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
- H04B7/0417—Feedback systems
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- 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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
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- H—ELECTRICITY
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- 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
- H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
- H04B7/0469—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking special antenna structures, e.g. cross polarized antennas into account
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- 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
- H04B7/0479—Special codebook structures directed to feedback optimisation for multi-dimensional arrays, e.g. horizontal or vertical pre-distortion matrix index [PMI]
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- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
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- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
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- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
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- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
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Definitions
- the present application relates to the field of communications, and in particular, to a method and an apparatus for reporting channel state information in the field of communications.
- LTE and next-generation wireless systems have widely adopted multiple-input multiple-output (MIMO) technology. If the network device can obtain all or part of the downlink channel information, a precoding technology can be used to improve the signal transmission quality or rate.
- MIMO multiple-input multiple-output
- a frequency division duplex frequency division duplexing, FDD
- FDD frequency division duplexing
- the terminal device obtains the downlink channel state information by measuring the channel state information reference signal (CSI-RS), and feeds the information of the precoding matrix to the network in the form of a precoding matrix index (PMI).
- CSI-RS channel state information reference signal
- PMI precoding matrix index
- TDD time division duplexing
- network devices can use channel reciprocity to obtain downlink channel state information. For example, a terminal device sends a sounding reference signal (SRS), and a network device can obtain a downlink channel by measuring an uplink channel, thereby obtaining a precoding matrix.
- SRS sounding reference signal
- the number of transmitting antenna ports of many terminal devices is less than the number of receiving antenna ports.
- a terminal device has one transmit antenna port, but has two receive antenna ports.
- the network device can only obtain the uplink channel (also the downlink channel) H 1 corresponding to the transmitting antenna port, and cannot obtain the downlink channel H 2 corresponding to the other receiving antenna port. Then, when the network device needs to transmit the layer 2 data stream to the terminal device at the same time, the accurate precoding matrix of the two layer data stream cannot be obtained, thereby causing the downlink data transmission performance to be damaged.
- the terminal device sends the SRS through the x transmitting antenna ports, and the network device obtains the channels of the x transmitting antenna ports;
- the terminal device measures the CSI-RS sent by the network device, obtains the channel information of the y receive antenna ports, and feeds back the PMI.
- the PMI indicates the channel matrix corresponding to the m non-transmit antenna ports of the yx non-transmit antenna ports of the terminal device.
- the network device uses the channel matrix information of the m transmitting antenna ports indicated by the PMI to determine the corresponding channel matrix information, and combines the channel matrix information of the x antenna ports obtained by the network device through SRS measurement to reconstruct the complete Matrix of downlink channels.
- the radio frequency components of the network device and the terminal device are different, the power gain of the channel measured by the network device according to the SRS and the channel fed back by the terminal device according to the CSI-RS measurement are different, and the downlink channel state information obtained by the foregoing method is not accurate enough.
- the present application provides a method and device for reporting channel state information, which is beneficial to improving the accuracy of the channel state information acquired by a network device, thereby improving data transmission performance.
- a method for reporting channel state information including: a terminal device obtaining first indication information, where the first indication information is used to indicate channel state information of a first antenna port set and channels of a second antenna port set Difference value between state information, wherein the first antenna port set includes x antenna ports of the terminal device, the second antenna port set includes m antenna ports of the terminal device, the first antenna port set and the The second antenna port set is different, and x and m are positive integers; the terminal device sends the first indication information.
- a terminal device reports a difference value of channel state information between two antenna ports, so that a network device can eliminate the influence of different transmission powers of the network device and the terminal device according to the difference value. , It is beneficial to improve the accuracy of the channel state information obtained by the network equipment, thereby improving the data transmission performance.
- the differential value of A and B may be a differential value of A and B in a linear domain, or may be a differential of A and B in a transform domain (for example, a dB domain). value.
- the difference between A and B can be AB, or BA, or A / B, or B / A.
- the difference between A and B can be A (dB) -B (dB), or B (dB) -A (dB), or A (dB) / B (dB), or B (dB) / A (dB).
- X (dB) represents the value after X is converted to dB.
- this embodiment does not exclude other transformation domains.
- the method further includes at least one of the following steps: the terminal device receives a first reference signal, and the first reference signal is used to obtain the first indication information; The terminal device sends channel state information of the second antenna port set; the terminal device sends a second reference signal through the first antenna port set.
- the first reference signal is used to determine channel state information of the second antenna port set and channel state information of the first antenna port set, so as to further obtain the foregoing first indication information.
- receiving the first reference signal by the terminal device may mean that the terminal device receives the first reference signal through all or part of the antenna port of the second antenna port set and all or part of the antenna port of the first antenna port set.
- the terminal device according to the channel state information fed back from the measurement of the first reference signal measures the set of antenna port sets corresponding to the first antenna port set; the terminal device sends the second reference signal to the set of all or part of the antenna ports set as the second antenna.
- Port collection That is, in the embodiment of the present application, the manner in which the network device obtains the channel state information of the first antenna port set and the manner in which the channel state information of the second antenna port set is obtained are different.
- the first antenna port set and the second antenna port set may have an intersection, that is, some antenna ports in the two sets are the same.
- the network device can obtain the above two methods, and which method is finally used to obtain the channel state information can be determined by the network device according to the situation.
- the intersection of the first antenna port set and the second antenna port set may also be empty, which is not limited in this embodiment of the present application.
- the terminal device has four antenna ports, which are port 1, port 2, port 3, and port 4, and have two power amplifiers (PAs).
- PAs power amplifiers
- the port number may also start from 0, which is not limited in the embodiment of the present application.
- the PA connects to port 1 and port 2.
- the first antenna port set is composed of port 1 and port 2
- the second antenna port set is composed of port 3 and port 4.
- the intersection of the first antenna port set and the second antenna port set is an empty set.
- the network device can obtain the channel status of port 1 and port 2 through the second reference signal, and can obtain the channel status of port 3 and port 4 through the feedback from the terminal device.
- the second antenna port set may be composed of one of port 3 and port 4, and the first antenna port set is composed of port 1 and port 2. At this time, the intersection of the first antenna port set and the second antenna port set is an empty set.
- the network device can determine the number of data layers for each terminal device. If the network device determines that it can only schedule up to 3 layers of data for the terminal device (assuming corresponding ports 1, 2 and 3), it passes After obtaining the channel status of port 1 and port 2 with the second reference signal, it is only necessary to obtain the channel status information of the other port (ie, port 3). This method may bring some performance loss, but it can reduce the reporting overhead.
- the first antenna port set is composed of port 1 and port 2
- the second antenna port set is composed of port 1, port 3, and port 4.
- the first antenna port set and the second antenna port set have an intersection, but the two are different.
- the network device can obtain the channel status of port 1 through the second reference signal, but the network device determines that the signal-to-noise ratio (SNR) of the channel of port 1 is too low, so it measures the second reference signal The obtained channel state of port 1 is inaccurate, and the terminal device can report the channel state information of port 1 by measuring the first reference signal, thereby reconstructing a more accurate channel.
- SNR signal-to-noise ratio
- the PA can connect to port 1 and port 2 at one time and switch to port 3 and port 4 at another time through the switch.
- the first antenna port set is composed of port 1, port 2, port 3, and port 4
- the second antenna port set is composed of port 3 and port 4.
- the intersection of the first antenna port set and the second antenna port set is not an empty set, but the two are different.
- An application scenario is: a terminal device periodically uses ports 1 and 2 to send a second reference signal at times n 1 + T, n 1 + 2T ..., and periodically at times n 2 + T, n 2 + 2T Ground uses ports 3 and 4 to send a second reference signal.
- the network device decides to trigger the terminal device to report the CSI.
- the second reference signal closest to time n 3 is sent by the terminal device through port 1 and port 2, so the channel state information of port 1 and port 2 can also be used, and the channel states of port 3 and port 4 The information is too old to be used. Therefore, the network device can trigger the terminal device to report the channel state information corresponding to port 3 and port 4, thereby improving the accuracy of reconstructing the channel.
- the second antenna port set may be composed of port 3 and port 4, and the first antenna port set is composed of port 1 and port 2.
- the ports where the network device obtains the channel state information through feedback from the terminal device form a second antenna port set, and the ports that obtain the channel state information only by measuring the second reference signal form the first antenna port set.
- the intersection of the first antenna port set and the second antenna port set is an empty set.
- the specific definition of the second antenna port set and the first antenna port set is not limited in this application, and only the two are restricted.
- the first indication information is a broadband parameter, or the first indication information is a subband parameter.
- the terminal device only needs to report one first indication information for the entire reported bandwidth of the CSI. If the first indication information is a subband parameter, for each subband in the CSI reporting bandwidth, the terminal device needs to report one first indication information.
- the channel state information of the first antenna port set includes first amplitude information associated with a channel matrix G u of the first antenna port set; and / or
- the channel state information of the second antenna port set includes second amplitude information associated with a channel matrix G d of the second antenna port set;
- G d is a matrix of m rows and M columns
- G u is a matrix of x rows and M columns
- M is a positive integer
- the channel matrix G u of the first antenna port set refers to a matrix composed of channel vectors corresponding to all or part of the antenna ports in the first antenna port set.
- a matrix composed of channel vectors corresponding to all antenna ports in the first antenna port set is expressed as x represents the number of ports included in the first antenna port set, and M is the number of ports of the network device that sends the first reference signal.
- the expression form of matrix G u composed of channel vectors corresponding to some antenna ports in the first antenna port set is similar. At this time, the number of rows of G u is the number of antenna ports in some antenna ports.
- the channel matrix G d of the second antenna port set is a matrix composed of channel vectors corresponding to all or part of the ports in the second antenna port set.
- a matrix composed of channel vectors corresponding to all antenna ports in the second antenna port set is expressed as m represents the number of ports included in the second antenna port set, and M is the number of ports of the network device that sends the first reference signal.
- the expression form of the matrix G d composed of channel vectors corresponding to some antenna ports in the second antenna port set is similar. At this time, the number of rows of G d is the number of antenna ports in the partial antenna ports.
- the first amplitude information G u may be associated with the channel matrix G u a first set of antenna ports in a determined amplitude information element may be based on all or part of the G u element A certain amplitude information obtained through some processing; the above-mentioned second amplitude information associated with G d may be determined according to the amplitude information of an element in the channel matrix G d of the second antenna port set, or may be based on The amplitude information obtained by all or part of the elements in G d obtained through some processing is determined, which is not limited in the embodiment of the present application. It should be understood that the first amplitude information may be subband amplitude information or broadband amplitude information, and the second amplitude information may be subband amplitude information or broadband amplitude information, which is not limited in this embodiment of the present application.
- the first amplitude information may be a function of the amplitude.
- the first amplitude information may be the amplitude itself, or the power, or the amplitude or power conversion to
- the values after the other domains can also be the values after the amplitude or power or their conversion to the dB domain after some processing (such as normalization or quantization). .
- the first information may be a function of the amplitude of the amplitude information in an element of G u.
- the first information may be a function of the amplitude of the amplitude information G u all or part of the elements.
- the channel state information of the second antenna port set is similar to the channel state information of the first antenna port set, and details are not described herein again.
- the first indication information may be a broadband parameter or a subband parameter.
- the first indication information is a broadband parameter
- the first amplitude information and the second amplitude information are broadband amplitude information.
- the (all or part) element of the channel matrix G d of the second antenna port set or the (all or part) element of the matrix W 2, d corresponding to G d The amplitude is jointly expressed by the wideband amplitude and the subband differential amplitude.
- the terminal device reports G d
- the wideband amplitude of all or part of the elements can be normalized based on the first amplitude information, and the subband differential amplitude can be reported normally. .
- the amplitude of all or part of the elements of G d or all or part of W 2, d is directly expressed as the subband amplitude, and is not split into a wideband amplitude plus sub
- the subband amplitude of all or part of the elements may be normalized based on the first amplitude information.
- the operation of the channel matrix G u of the first antenna port set by the network device is similar to the operation of the terminal device on G d , and details are not described herein again.
- the first indication information is a subband parameter
- the first amplitude information and the second amplitude information are subband amplitude information.
- the amplitude of the (all or part) element of G d or the (all or part) element of W 2, d is directly expressed as the subband amplitude, and is not split into broadband
- the sub-band amplitude of the above element can be normalized with the sub-band amplitude of the first amplitude information as a reference.
- the operation of the channel matrix G u of the first antenna port set by the network device is similar to the operation of the terminal device on G d , and details are not described herein again.
- the above-mentioned channel state information is power information, and the value of the latter is in the dB domain.
- the power is the square of the amplitude. Therefore, it can also be understood that the above-mentioned channel state information is a function of the amplitude.
- the first amplitude information is determined based on any of the following elements: at least one line element G u amplitude information of the maximum value of the elements, the corresponding G u matrix W 2, u at least one element of the maximum amplitude value of the information element, at least a singular value of G u of the maximum value of the amplitude information of the singular value, at least one characteristic value G u maximum amplitude value characteristic information Value; and / or
- the second amplitude information is based on any of the following elements identified: at least one line element G d values of amplitude information of the largest element, G d corresponding matrix W 2, d of at least one element of the maximum value of the amplitude information element, at least one characteristic value G d takes the value of the maximum amplitude value characteristic, the at least one singular value of G d takes the value of the maximum amplitude of the singular values;
- the first amplitude information is determined according to an element with the largest amplitude information value among at least one row of elements of G u , and the second amplitude information is based on G d The element with the largest amplitude information in at least one row of elements is determined.
- the first amplitude information is based on the corresponding matrix G u W 2, u at least one element of the amplitude value of the information element to determine the maximum of the second
- the l d column of X, W 1 is a matrix of M * N
- u is a matrix of N * x
- d is a matrix of N * m
- N is a positive integer
- W 1 is a block diagonal array.
- W 1 is a wideband parameter
- W 2, u and W 2, d include wideband parameters (for example, wideband amplitude) and subband parameters (for example, subband differential amplitude and subband phase), or W 2, u , W 2, d includes subband parameters (such as subband amplitude and subband phase).
- the terminal device can represent G u and G d by feeding back the index of the parameter of W 1 and the index of the parameter of W 2 .
- the first amplitude information is determined according to an element with the largest amplitude information value among at least one row of elements of G u
- the second amplitude information corresponds to G d
- X (l d ) denote the l d-th column of matrix X
- W 1 is a matrix of M * N
- d is a matrix of N * m
- N is a positive integer
- the first amplitude information is directly determined according to the channel matrix G u , which can prevent the terminal device from decomposing the dual codebook structure of G u , and the network device does not need to perform dual code on the uplink channel matrix when reconstructing the complete channel state matrix.
- the decomposition of this structure can reduce the complexity of network equipment and terminal equipment while obtaining accurate channel state information.
- the first information is a value of the amplitude of at least one singular value of G U amplitude information determined maximum singular value
- the second amplitude information is based on G The singular value with the largest amplitude information among at least one singular value of d is determined.
- the first amplitude information is determined according to a feature value that has the largest amplitude information value among at least one characteristic value of G u , and the second amplitude information is based on G The feature value with the largest amplitude information among at least one feature value of d is determined.
- the magnitude of the first amplitude information of the first information element, the first element is an element in G u, G u corresponding matrix W 2, u in element, the singular values or eigenvalues of G u of G u; and / or
- the second amplitude information is amplitude information of a second element, and the second element is an element in G d , an element in matrix W 2 d corresponding to G d, a singular value of G d , or a characteristic value of G d .
- the first value of the maximum amplitude information element is determined according to at least one row of elements G u amplitude information, or the first element of the first amplitude information
- the amplitude information, the index of the first element is predefined
- the second amplitude information includes n sub-elements, and the i-th sub-element of the n sub-elements is determined according to the element with the largest amplitude information among the M elements of the i-th row of the n-th row of G d , n is a positive integer, i ⁇ ⁇ 1,2, ..., n ⁇ .
- the value of the first amplitude information is determined according to the largest element of the matrix corresponding to G u W 2, at least one element of the amplitude u of information, or the first A magnitude information is the magnitude information of the first element, and an index of the first element is predefined;
- the second amplitude information comprises n sub-elements, the i-th element of the n sub-elements according to the largest element of the matrix corresponding to G d W 2, d N elements of column n in the i-th column of the amplitude information determined , N is a positive integer, i ⁇ ⁇ 1,2, ..., n ⁇ ;
- n is greater than or equal to two.
- At least one line of the G d includes n lines, where n is a positive integer, and the method further includes:
- the terminal device sends second indication information, where the second indication information is used to indicate the amplitude information of the n-1 third elements except the second element among the n third elements and the amplitude information of the second element
- the difference value of, where the i-th third element of the n third elements is determined according to the element with the largest amplitude information among the M elements of the i-th row in the n rows, and the second amplitude information is based on the The amplitude information of the second element is determined.
- At least one column in the matrix W 2, d includes n columns, where n is a positive integer, and the method further includes:
- the terminal device sends third indication information, where the third indication information is used to indicate the amplitude information of the n-1 fourth elements except the second element among the n fourth elements and the amplitude information of the second element
- the difference value of, wherein the i-th fourth element of the n fourth elements is determined according to the element with the largest amplitude information among the N elements of the i-th column in the n columns, and the second amplitude information is determined according to the The amplitude information of the second element is determined.
- the method further includes: the terminal device sends fourth indication information, where the fourth indication information is used to indicate an index of the first element and / or the second element The index of the element.
- the index of the first element is predefined; and / or the index of the second element is predefined.
- the first amplitude information is determined based on amplitude information of at least two elements of G u, or, according to the first amplitude information corresponding matrix G u Determined by the amplitude information of at least two elements of W 2, u ; and / or,
- the second amplitude information is determined according to the amplitude information of at least two elements of G d ; or the second amplitude information is determined according to the amplitude information of at least two elements of the matrix W 2, d corresponding to G d ;
- G d T (l d ) W 1 ⁇ W 2, d (l d ), X T represents the transpose of matrix X, X (l d ) represents the l d column of matrix X, and W 1 is M * A matrix of N, W 2, d is a matrix of N * m, N is a positive integer, and l d ⁇ ⁇ 1,2, ..., m ⁇ .
- the foregoing determination according to the amplitude information of the at least two elements may be determined according to a function of the amplitude information of the at least two elements.
- the above function may be a weighted sum of the amplitude information of at least two elements, or may be a weighted sum transformed to other domains (such as the dB domain), or may be a weighted average of the amplitude information of at least two elements , Or weighted average transform to other domains (such as dB domain).
- the first amplitude information is determined according to an average value of amplitude information of at least two elements of G u
- the second amplitude information is determined according to at least G d Determined by the average of the amplitude information of the two elements
- the first amplitude information is determined according to an average value of the amplitude information of at least two elements of the matrix W 2, u corresponding to Gu, and the second amplitude information is based on at least two of the matrix W 2, d corresponding to G d
- the average value of the amplitude information of the element is determined.
- the weighted average of the amplitude information of at least two elements may be a weighted average of wideband amplitude information or a weighted average of subband amplitude information.
- the above determination based on the average value may include the average value itself or a function determined based on the average value, for example, a sum value of amplitude information of at least two elements, where the sum value is a multiple of the average value, This embodiment of the present application does not limit this.
- the average value mentioned in the embodiment of the present application may be an arithmetic average, or a geometric average, a root mean square average, or a weighted average, which is not limited in the embodiment of the present application.
- the first amplitude information is determined according to a sum of amplitude information of at least two elements of G u
- the second amplitude information is determined according to at least G d Determined by the sum of the amplitude information of the two elements
- the first amplitude information is determined according to the sum of the amplitude information of at least two elements of the matrix W 2, u corresponding to G u , and the second amplitude information is based on the at least two of the matrix W 2, d corresponding to G d The sum of the amplitude information of the elements is determined.
- the weighted summation of at least two element amplitude information may be a weighted summation of wideband amplitude information or a weighted summation of subband amplitude information.
- the foregoing determination based on the summation may include the summation value of the amplitude information itself, or may also include a determination based on a function of the summation value, which is not limited in the embodiment of the present application.
- the first amplitude information is determined according to the norm information of the matrix G ′ u
- the second amplitude information is determined according to the norm information of the matrix G ′ d ;
- the first amplitude information is determined according to the norm information of the matrix W 2, u corresponding to the matrix G ′ u
- the second amplitude information is determined based on the norm information of the matrix W 2, d corresponding to G ′ u .
- X T represents the transpose of matrix X
- X (l u ) represents the l u column of matrix X
- X (l d ) represents the l d column of matrix X
- W 1 is a matrix of M * N
- W 2 u Is a matrix of N * x
- W 2 is a matrix of N * m
- N is a positive integer, l u ⁇ ⁇ 1,2, ..., x ⁇ , l d ⁇ ⁇ 1,2, ..., m ⁇
- G ′ u includes at least two elements of G u
- G ′ d includes at least two elements of G d .
- the matrix G 'u norm may be information G' u p subbands norm function of the number, may be G 'function of the number of broadband u p-norm, a subband may also be the average norm p
- the possible forms of the function are similar to the foregoing, which are not limited in the embodiment of the present application, where p is a natural number.
- the norm information of G ′ d , W 2, d and W 2, u is similar to the norm information of G ′ u .
- the first antenna port set is predefined, determined by the terminal device according to a configuration of a network device, or determined according to a terminal capability reported by the terminal device; and / or
- the second antenna port set is predefined, determined by the terminal device according to the configuration of the network device, or determined according to the terminal capability reported by the terminal device.
- the first antenna port set and the second antenna port set may be predefined.
- the second antenna port set and the second antenna port set may be predefined to send the second k times closest to the time when the network device triggers the terminal device to report channel state information.
- the antenna ports of the reference signal constitute an antenna port set.
- the remaining other antenna ports among the y antenna ports of the terminal device are the second antenna port set, and k is a positive integer.
- the first antenna port set and the second antenna port set may be determined according to a configuration of a network device.
- the network device may indicate, through the configuration information, which antenna ports the terminal device reports the channel status information to. These antenna ports are the second antenna port set. The remaining antenna ports among the y antenna ports of the terminal device are Make up the first antenna port set.
- the network device may indicate to which antenna ports the channel state information reported by the terminal device is not directed, and these antenna ports form a first antenna port set, and other antenna ports form a second antenna port set.
- the specific indication manner may be a direct indication or an indirect indication, which is not limited in the embodiment of the present application. If a direct instruction is used, the network device may indicate the port number of the antenna port, and if an indirect instruction is used, the network device may indicate the port number of the antenna port.
- the first antenna port set and the second antenna port set may be determined according to a terminal capability, and the terminal capability may be reported by the terminal device to the network device. For example, if the terminal device reports itself as 2 transmitting and 4 receiving (2T4R), the first antenna port set is 2 antenna ports out of the 4 antenna ports, and the second antenna port set is 4 antenna ports except the above 2 antenna ports. The other 2 antenna ports.
- the first antenna port set and / or the second antenna port set is at least one of the following signalings sent by the terminal device through the network device.
- the configuration information carried is determined: radio resource control RRC, multiple access control MAC control element CE, and downlink control information DCI.
- the network device may configure the first antenna port set and / or the second antenna port set to the terminal device through at least one signaling of RRC, DCI, and MAC CE.
- the network device may indicate configuration information reported by the channel state information through RRC signaling, and the configuration information may be directly used to determine the first antenna port set and / or the second antenna port set. After receiving the configuration information, the terminal device can determine the first antenna port set and / or the second antenna port set according to the configuration information. Optionally, the reporting of the channel state information is periodic.
- RRC + DCI The network device may indicate configuration information reported by the channel state information through RRC signaling, and the configuration information may be used to determine the first antenna port set and / or the second antenna port set.
- the network device triggers the terminal device to report channel state information through DCI.
- the reporting of the channel state information is aperiodic or semi-persistent.
- the terminal device is 2T4R and supports antenna selection.
- the network device may indicate configuration information reported by the channel state information through RRC signaling, and the configuration information may determine that the second antenna port set includes all antenna ports among the four antenna ports of the terminal device. Since only two antenna ports send the second reference signal at a time, the network device can select which two antenna ports among the four antenna ports that are not targeted or targeted for the current report through DCI. For example, the numbers of the four ports are 0, 1, 2, and 3, and the network device may select the ports targeted for this report through port 1 and port 2. Therefore, the terminal device determines that the first antenna port set includes ports. 1 and port 2, and the second antenna port set includes port 3 and port 4.
- a larger set is configured through RRC, and DCI selects a subset in the set as the first antenna port set, which is more flexible and can reduce the number of channel state information reports configured by RRC. For example, if two of the four antenna ports of the terminal device have low channel SNR, the SRS measurement of these two antenna ports will be very inaccurate, resulting in inaccurate precoding of downlink data. By DCI triggering the channel status feedback of the two antenna ports, the accuracy of the channel information of the two ports can be improved.
- RRC + MAC CE + DCI Network equipment can send configuration information through RRC to indicate multiple possible antenna port sets, and then select a part of the antenna port set from multiple possible antenna port sets as alternatives through MAC CE Set, and finally select an antenna port set from the candidate set through DCI as the first antenna port set and / or the second antenna port set corresponding to this report.
- the first reference signal is a channel state information reference signal CSI-RS; and / or the second reference signal is a sounding reference signal SRS.
- a method for reporting channel state information including: a network device sends a first reference signal; the network device receives first indication information obtained by a terminal device according to the first reference signal, and the first indication information A value used to indicate a difference between channel state information of a first antenna port set and channel state information of a second antenna port set, wherein the first antenna port set includes x antenna ports of the terminal device, and The second antenna port set includes m antenna ports of the terminal device, the first antenna port set is different from the second antenna port set, and x and m are positive integers.
- the method further includes at least one of the following steps: the network device receives channel state information of the second antenna port set; and the network device receives Second reference signal.
- the first indication information is a broadband parameter, or the first indication information is a subband parameter.
- the channel state information of the first antenna port set includes first amplitude information associated with a channel matrix G u of the first antenna port set; and /or
- the channel state information of the second antenna port set includes second amplitude information associated with a channel matrix G d of the second antenna port set;
- G d is a matrix of m rows and M columns
- G u is a matrix of x rows and M columns
- M is a positive integer
- the first amplitude information is determined based on any of the following elements: at least one line element G u amplitude information of the maximum value of the elements, the corresponding G u matrix W 2, u at least one element of the maximum amplitude value of the information element, at least a singular value information G u amplitude value of the maximum singular value, at least one characteristic value G u maximum amplitude value of the information Characteristic values; and / or
- the second amplitude information is determined according to any one of the following elements: an element having the largest amplitude information value in at least one row of the elements of G d , and having the largest amplitude information value in at least one column of the elements corresponding to G d in the matrix W 2, d elements, at least one characteristic value G d takes the value of the maximum amplitude value characteristic, the at least one singular value of G d takes the value of the maximum amplitude of the singular values;
- the first amplitude information is determined according to an element with the largest amplitude information value among at least one row of elements of G u , and the second amplitude information is based on G The element with the largest amplitude information value in at least one row of d is determined.
- the amplitude information is the first value
- the second largest singular value of the element is determined in accordance with at least one singular value G u based on the amplitude information
- the singular value with the largest amplitude information among at least one singular value of G d is determined.
- the amplitude information is the first value, the second largest eigenvalues determined element according to at least one characteristic value G u based on the amplitude information The feature value with the largest amplitude information among at least one feature value of G d is determined.
- the first amplitude information of a first element is an element in G u, G u corresponding matrix W 2, u in elements, features or singular values of G u G u value; and / or
- the second amplitude information is a second element, and the second element is an element in G d , an element in matrix W 2 d corresponding to G d, a singular value of G d , or a characteristic value of G d .
- the amplitude information is the first value of the determined largest element, or the first amplitude information according to the at least one row of elements G u for the first amplitude information
- the index of the first element is predefined
- the second amplitude information includes n sub-elements, and the i-th sub-element of the n sub-elements is determined according to the element with the largest amplitude information among the M elements of the i-th row in the n-th row of G d , n is a positive integer , I ⁇ ⁇ 1,2, ..., n ⁇ .
- the first amplitude information is determined based on the maximum element u G corresponding to the matrix W 2, at least one element of the amplitude takes the value of u or the
- the first amplitude information is a first element, and an index of the first element is predefined;
- the second amplitude information comprises n sub-elements, the i-th element of the n elements is a child element of G d N matrix corresponding to W 2, d n-th column of the i-th column of the amplitude information element Certainly, n is a positive integer, i ⁇ ⁇ 1,2, ..., n ⁇ ;
- At least one row of G d includes n rows, and n is a positive integer, and the method further includes:
- Second indication information is used to indicate that, in addition to the second element, the amplitude information of the remaining n-1 third elements out of the n third elements is related to the first The difference value of the amplitude information of two elements, wherein the i-th third element of the n third elements is determined according to the element with the largest amplitude information among the M elements of the i-th row in the n rows.
- the second amplitude information is determined according to the amplitude information of the second element.
- At least one column in the matrix W 2, d includes n columns, where n is a positive integer, and the method further includes:
- third indication information where the third indication information is used to indicate that, in addition to the second element, the amplitude information of the remaining n-1 fourth elements among the n fourth elements is related to the first fourth element;
- the second amplitude information is determined according to the amplitude information of the second element.
- the method further includes: the network device receives fourth indication information, where the fourth indication information is used to indicate an index of the first element and / Or the index of the second element.
- the index of the first element is predefined; and / or the index of the second element is predefined.
- the first amplitude information is determined according to the amplitude information of at least two elements of G u
- the second amplitude information is determined according to at least two of the G d Determined by the amplitude information of each element
- the first amplitude information is determined according to the amplitude information of at least two elements of the matrix W 2, u corresponding to G u , and the second amplitude information is based on the at least two elements of the matrix W 2, d corresponding to G d
- the first amplitude information is determined according to an average value of the amplitude information of at least two elements of G u
- the second amplitude information is determined according to G d Determined by the average of the amplitude information of at least two elements of the;
- the first amplitude information is determined according to an average value of the amplitude information of at least two elements of the matrix W 2, u corresponding to G u , and the second amplitude information is based on at least the matrix W 2, d corresponding to G d The average of the amplitude information of the two elements is determined.
- the first amplitude information is determined according to a sum of amplitude information of at least two elements of G u
- the second amplitude information is determined according to G d Determined by the sum of the amplitude information of at least two elements of;
- the first information is based on the amplitude u G matrix corresponding to W 2, the amplitude sum is determined of at least two information elements u of the second amplitude information is 2, d is at least according to the corresponding matrix W G d The sum of the amplitude information of the two elements is determined.
- the first amplitude information is determined according to the norm information of the matrix G ′ u
- the second amplitude information is determined according to the norm of the matrix G ′ d . Determined by the information; or
- the first amplitude information is determined according to the norm information of the matrix W 2, u corresponding to the matrix G ′ u , and the second amplitude information is determined based on the norm information of the matrix W 2, d corresponding to G ′ u ,among them
- X T represents the transpose of matrix X
- X (l u ) represents the l u column of matrix X
- X (l d ) represents the l d column of matrix X
- W 1 is a matrix of M * N
- W 2 u Is a matrix of N * x
- d is a matrix of N * m
- N is a positive integer, l u ⁇ ⁇ 1,2, ..., x ⁇ , l d ⁇ ⁇ 1,2, ..., m ⁇
- G ′ u includes at least two elements of G u
- G ′ d includes at least two elements of G d .
- the first antenna port set is predefined, determined by the terminal device according to a configuration of a network device, or according to a terminal capability reported by the terminal device Identified; and / or
- the second antenna port set is predefined, determined by the terminal device according to a configuration of a network device, or determined according to a terminal capability reported by the terminal device.
- the first reference signal is a channel state information reference signal CSI-RS; and / or the second reference signal is a sounding reference signal SRS.
- an apparatus for reporting channel state information is provided, and is configured to execute the method in the first aspect or any possible implementation manner of the first aspect.
- the apparatus includes a unit for performing the foregoing first aspect or the method in any possible implementation manner of the first aspect.
- another apparatus for reporting channel state information is provided, and is configured to execute the method in the second aspect or any possible implementation manner of the second aspect.
- the apparatus includes a unit for executing the method in the second aspect or any possible implementation manner of the second aspect.
- the apparatus includes a transceiver, a memory, and a processor.
- the transceiver, the memory, and the processor communicate with each other through an internal connection path.
- the memory is used to store instructions.
- the processor is used to execute the instructions stored in the memory to control the receiver to receive signals and the transmitter to send signals. And when the processor executes the instructions stored in the memory, the processor is caused to execute the method in the first aspect or any possible implementation manner of the first aspect.
- the apparatus includes a transceiver, a memory, and a processor.
- the transceiver, the memory, and the processor communicate with each other through an internal connection path.
- the memory is used to store instructions.
- the processor is used to execute the instructions stored in the memory to control the receiver to receive signals and the transmitter to send signals. And when the processor executes the instructions stored in the memory, the processor is caused to execute the method in the second aspect or any one of the possible implementation manners of the second aspect.
- a system for reporting channel state information includes the device in the third aspect or any one of the possible implementation manners of the third aspect, and any of the fourth aspect or the fourth aspect. Means in an implementation; or
- the system includes the device in the fifth aspect or any one of the possible implementations of the fifth aspect, and the device in the sixth aspect or any one of the possible implementations of the sixth aspect.
- a computer program product includes computer program code that, when the computer program code is executed by a computer, causes the computer to execute the methods in the foregoing aspects.
- a computer-readable medium for storing a computer program, the computer program including instructions for performing the methods in the above aspects.
- a chip system including: an input interface, an output interface, at least one processor, and a memory.
- the input interface, the output interface, the processor, and the memory are connected through an internal connection path.
- the processor is configured to execute code in the memory, and when the code is executed, the processor is configured to execute the methods in the foregoing aspects.
- FIG. 1 is a schematic diagram of a communication system according to an embodiment of the present application.
- FIG. 2 shows a schematic flowchart of a method for reporting channel state information according to an embodiment of the present application.
- FIG. 3 shows a schematic flowchart of another method for reporting channel state information according to an embodiment of the present application.
- FIG. 4 shows a schematic block diagram of an apparatus for reporting channel state information according to an embodiment of the present application.
- FIG. 5 shows a schematic block diagram of another apparatus for reporting channel state information according to an embodiment of the present application.
- FIG. 6 shows a schematic block diagram of another apparatus for reporting channel state information according to an embodiment of the present application.
- FIG. 7 shows a schematic block diagram of another apparatus for reporting channel state information according to an embodiment of the present application.
- GSM global system of mobile communication
- CDMA code division multiple access
- WCDMA broadband code Wideband Code Division Multiple Access
- GPRS General Packet Radio Service
- LTE Long Term Evolution
- FDD Frequency Division Duplex
- TDD time division duplex
- UMTS universal mobile communication system
- WiMAX microwave access
- WiMAX future fifth generation communication system 5th generation
- 5G 5th generation
- NR new radio
- the technical solutions of the embodiments of the present application can also be applied to various communication systems based on non-orthogonal multiple access technologies, such as sparse code multiple access (SCMA) systems.
- SCMA sparse code multiple access
- SCMA is in The communication field may also be called other names;
- the technical solutions in the embodiments of the present application may be applied to a multi-carrier transmission system using non-orthogonal multiple access technology, for example, using non-orthogonal multiple access technology orthogonal Orthogonal frequency division multiplexing (OFDM), filter bank multi-carrier (FBMC), generalized frequency division multiplexing (GFDM), filtered orthogonal frequency division multiplexing (GFDM) filtered-OFDM, F-OFDM) system, etc.
- OFDM orthogonal Orthogonal frequency division multiplexing
- FBMC filter bank multi-carrier
- GFDM generalized frequency division multiplexing
- GFDM filtered orthogonal frequency division multiplexing
- F-OFDM F-OFDM
- a terminal device may communicate with one or more core networks via a radio access network (RAN).
- the terminal device may be referred to as an access terminal or a user equipment (user equipment). equipment, UE), subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user device.
- the access terminal can be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital processing (PDA), and wireless communication.
- PLMN public land mobile network
- a network device may be used to communicate with a terminal device.
- the network device may be a base station (BTS) in a GSM system or a CDMA system, or a base station in a WCDMA system ( node (B, NB), or an evolutionary base station (eNB or eNodeB) in the LTE system, or the network device may be a relay station, an access point, a vehicle device, a wearable device, or a future 5G network Network-side equipment, or network equipment in a future-evolved PLMN network.
- B base station
- eNB evolved base station
- the embodiments of the present application can be applied to LTE systems and subsequent evolved systems such as 5G, or other wireless communication systems using various wireless access technologies, such as code division multiple access, frequency division multiple access, time division multiple access, and orthogonal Frequency-division multiple access, single-carrier frequency-division multiple access and other access technology systems are particularly suitable for scenarios that require channel information feedback and / or the application of secondary precoding technology, such as wireless networks using Massive MIMO technology, and distributed antennas. Technology wireless networks, etc.
- multiple-input (multiple-output, MIMO) technology refers to the use of multiple transmitting antennas and receiving antennas at the transmitting device and receiving device, respectively, so that signals pass through multiple transmitting and receiving devices.
- Antennas transmit and receive, which improves communication quality. It can make full use of space resources, realize multiple transmissions and multiple receptions through multiple antennas, and can increase the channel capacity of the system multiple times without increasing spectrum resources and antenna transmit power.
- MIMO can be divided into single-user multiple-input multiple-output (SU-MIMO) and multi-user multiple-input multiple-output (MU-MIMO).
- SU-MIMO single-user multiple-input multiple-output
- MU-MIMO multi-user multiple-input multiple-output
- Massive MIMO is based on the principle of multi-user beamforming. Hundreds of antennas are placed on the transmitting device to modulate their respective beams to dozens of target receivers. Through spatial signal isolation, dozens of signals are transmitted simultaneously on the same frequency resource. Therefore, Massive MIMO technology can make full use of the spatial freedom brought by large-scale antenna configuration and improve spectral efficiency.
- FIG. 1 is a schematic diagram of a communication system used in an embodiment of the present application.
- the communication system 100 includes a network device 102, and the network device 102 may include multiple antenna groups.
- Each antenna group may include one or more antennas, for example, one antenna group may include antennas 104 and 106, another antenna group may include antennas 108 and 110, and additional groups may include antennas 112 and 114.
- Two antennas are shown in FIG. 1 for each antenna group, however more or fewer antennas can be used for each group.
- the network device 102 may additionally include a transmitter chain and a receiver chain. Those of ordinary skill in the art can understand that each of them can include multiple components related to signal transmission and reception, such as a processor, a modulator, a multiplexer, and a decoder. Tuner, demultiplexer, or antenna.
- the network device 102 may communicate with multiple terminal devices, for example, the network device 102 may communicate with the terminal device 116 and the terminal device 122. However, it is understood that the network device 102 may communicate with any number of terminal devices similar to the terminal devices 116 or 122.
- the terminal devices 116 and 122 may be, for example, cellular phones, smartphones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and / or any other suitable devices for communicating on the wireless communication system 100. device.
- the terminal device 116 communicates with the antennas 112 and 114, where the antennas 112 and 114 send information to the terminal device 116 through the forward link 118 and receive information from the terminal device 116 through the reverse link 120.
- the terminal device 122 communicates with the antennas 104 and 106, where the antennas 104 and 106 send information to the terminal device 122 through the forward link 124 and receive information from the terminal device 122 through the reverse link 126.
- forward link 118 may utilize a different frequency band from that used by reverse link 120
- forward link 124 may utilize a different frequency band from that used by reverse link 126 .
- the forward link 118 and the reverse link 120 may use a common frequency band
- the forward link 124 and the reverse link 126 may use a common frequency band. frequency band.
- Each set of antennas and / or areas designed for communication is referred to as a sector of the network device 102.
- the antenna group may be designed to communicate with terminal devices in a sector covered by the network device 102.
- the transmitting antennas of the network device 102 can use beamforming to improve the signal-to-noise ratio of the forward links 118 and 124.
- the Mobile devices experience less interference.
- the network device 102, the terminal device 116, or the terminal device 122 may be a wireless communication transmitting apparatus and / or a wireless communication receiving apparatus.
- the wireless communication transmitting device may encode the data for transmission.
- the wireless communication transmitting device may acquire a certain number of data bits to be transmitted to the wireless communication receiving device through a channel.
- the wireless communication transmitting device may generate, receive from other communication devices, or save in a memory, etc., to be transmitted through the channel.
- Such data bits may be contained in a transport block or multiple transport blocks of data, which may be segmented to generate multiple code blocks.
- the communication system 100 may be a public land mobile network PLMN network or a device-to-device (D2D) network or a machine-to-machine (M2M) network or other network.
- PLMN public land mobile network
- D2D device-to-device
- M2M machine-to-machine
- FIG. 1 is only an example for easy understanding. Simplified schematic diagram, the network can also include other network equipment, not shown in Figure 1.
- the terminal device Take a terminal device with y receiving antenna ports and z power amplifiers (PAs) as an example, where z ⁇ y.
- PAs power amplifiers
- the terminal device supports or does not support antenna selection, according to the foregoing multiple definition methods, it can be determined that the first antenna port set is composed of x antenna ports of the y antenna ports, and The m antenna ports constitute a second port set. Because the number of PAs is less than the number of receiving antenna ports, when the network device is preparing to perform downlink data scheduling, it is impossible to rely on SRS to obtain accurate downlink channel state information of all y receiving ports in time.
- the following channel state information acquisition process can be adopted, so that the network device can obtain complete downlink channel state information.
- the terminal device measures the CSI-RS sent by the network device, obtains the channel information of the y receiving antenna ports, and feeds back corresponding indication information.
- the indication information indicates information of channel matrix information H d corresponding to m antenna ports among the y antenna ports of the terminal device, where m ports are different from at least one port of the x ports;
- the network device reconstructs the downlink channel matrix by using the information of the channel matrix H d and Hu obtained by the network device itself through SRS measurement. Then, a downlink precoding matrix is obtained.
- the Hu channel measured by the network equipment includes the influence of the power of the terminal equipment to send SRS, that is, the network equipment measurement obtains G srs is the measured value, and Hu is the actual value; G csi-rs is the measured value, Hu and H d are the actual values.
- G csi-rs, u is also called G u
- G csi-rs, d is also called G d .
- the channel indicated by the network device to the indication information fed back by the terminal device Perform reconstruction with the channel G srs measured by yourself to obtain the channel matrix That is, the power gain of the two channels is different. This will cause the precoding matrix obtained by the network device to operate on the channel matrix H cons to be inaccurate.
- One way to get the precoding matrix is to Singular value decomposition (SVD) or eigenvalue decomposition is performed to obtain rank main eigenvectors as the precoding matrix of each data layer. Due to different power gains, the main eigenvectors will be inaccurate.
- an embodiment of the present application proposes a new method for reporting channel state information.
- FIG. 2 shows a schematic flowchart of a method 200 for reporting channel state information according to an embodiment of the present application.
- the method 200 can be applied to the communication system 100 shown in FIG. 1, but the embodiment of the present application is not limited thereto.
- the network device sends the first reference signal to the terminal device, and accordingly, the terminal device receives the first reference signal
- the terminal device obtains first indication information by measuring the first reference signal, and the first indication information is used to indicate a difference between channel information of the first antenna port set and channel information of the second antenna port set.
- the first antenna port set includes x antenna ports of the terminal device
- the second antenna port set includes m antenna ports of the terminal device
- the first antenna port set and the first antenna port set The two antenna port sets are different, and x and m are positive integers;
- the terminal device sends the first instruction information to the network device; correspondingly, the network device receives the first instruction information.
- the network device may determine downlink channel state information between the terminal device and the network device according to the first indication information.
- the network device may send a first reference signal to the terminal device, and the terminal device receives the first reference signal and performs channel measurement to obtain a downlink channel state.
- the terminal device determines a difference value between the channel state information of the x antenna ports of the terminal device and the channel state information of the m antenna ports of the terminal device according to the measured downlink channel state.
- the terminal device can send the difference value to the network device, so that the network device can eliminate the influence caused by the power factor difference between the channel state information corresponding to the two antenna ports according to the difference value, thereby obtaining more accurate downlink channel state information.
- a terminal device reports a difference value of channel state information between two antenna ports, so that a network device can eliminate the influence of different transmission powers of the network device and the terminal device according to the difference , It is beneficial to improve the accuracy of the channel state information obtained by the network equipment, thereby improving the data transmission performance.
- the differential value of A and B may be a differential value of A and B in a linear domain, or may be a differential of A and B in a transform domain (for example, a dB domain) value.
- the difference between A and B can be AB, or BA, or A / B, or B / A.
- the difference between A and B can be A (dB) -B (dB), or B (dB) -A (dB), or A (dB) / B (dB), or B (dB) / A (dB).
- X (dB) represents the value after X is converted to dB.
- this embodiment does not exclude other transformation domains.
- the method further includes at least one of the following steps:
- the terminal device sends the channel state information of the second antenna port set, and correspondingly, the network device receives the channel state information of the second antenna port set;
- the terminal device sends a second reference signal through the first antenna port set, and accordingly, the network device receives the second reference signal.
- the network device may receive a second reference signal (for example, SRS) and perform channel measurement. Since the second reference signal is sent by the terminal device through all or part of the ports in the first antenna port set, the network device Only the channel state information of some antenna ports among the y antenna ports can be obtained through channel measurement. For another part of the channel, that is, corresponding to the second antenna port set in this embodiment, the network device may send a first reference signal (for example, CSI-RS) to the terminal device, and the terminal device receives the first reference signal and performs channel measurement. The channel state information of the second antenna port set is reported to the network device, and the difference between the channel state information of the first antenna port set and the channel state information of the second antenna port set is reported to the network device.
- CSI-RS channel state information of the second antenna port set
- the network device may determine the uplink channel state information of the first antenna port set as the downlink channel state information of the first antenna port set according to the channel reciprocity. Then, the network device may eliminate the power influence of the first antenna port set and the second antenna port set according to the first indication information and the channel state information of the second antenna port set reported by the terminal device, thereby reconstructing an accurate Downlink channel state information.
- FIG. 3 the specific process is shown in FIG. 3, including:
- the network device sends a first reference signal (for example, CSI-RS) to the terminal device, and the terminal device receives the first reference signal;
- a first reference signal for example, CSI-RS
- the terminal device may perform downlink channel measurement according to the first reference signal to obtain first indication information.
- the terminal device sends the first instruction information to a network device, and the network device receives the first instruction information.
- the terminal device sends channel state information of the second antenna port set to the network device, and the network device receives channel state information of the second antenna port set.
- the terminal device sends a second reference signal (for example, SRS) to the network device through the first antenna port set, and the network device receives the second reference signal.
- a second reference signal for example, SRS
- the network device may perform channel measurement according to the second reference signal to obtain channel state information of the first antenna port set, and combine the channel information of the first antenna port set indicated by the first instruction information reported by the terminal device and the second The difference between the channel information of the antenna port set and the channel state information of the second antenna port set determines the final downlink channel state information.
- a network device obtains channel information corresponding to a first antenna port set through a second reference signal, and obtains channel information corresponding to a second antenna port through terminal device feedback. Downlink channel information. Since only the channel information corresponding to some antenna ports needs to be fed back, it is possible to reduce the feedback overhead while solving the problem of CSI inaccuracy when there is no channel reciprocity in the TDD system.
- the first reference signal is used to determine channel state information of the second antenna port set and channel state information of the first antenna port set, so as to further obtain the foregoing first indication information.
- the terminal device may measure the first reference signal to determine a channel matrix G u corresponding to a port of the first antenna port set and a channel matrix G d corresponding to a port of the second antenna port set. Further, the terminal device may The first amplitude information is determined according to the amplitude information of the elements in G u , the second amplitude information is determined according to the amplitude information of the elements in G d , and the difference between the first amplitude information and the second amplitude information is determined. The terminal device may finally obtain the first indication information according to the difference value (or performing operations such as quantization of the difference value).
- receiving the first reference signal by the terminal device may mean that the terminal device receives the first reference signal through all or part of the antenna port of the second antenna port set and all or part of the antenna port of the first antenna port set.
- the terminal ports corresponding to the channel state information determined and fed back by measuring the first reference signal form the first antenna port set; all or part of the antenna ports corresponding to the second reference signal sent by the terminal apparatus form the second antenna port set. That is, in the embodiment of the present application, the manner in which the network device obtains the channel state information of the first antenna port set and the manner in which the channel state information of the second antenna port set is obtained are different.
- the first antenna port set and the second antenna port set may have an intersection (that is, some antenna ports in the two sets are the same), or the intersection may be empty, which is not limited in the embodiment of the present application.
- the terminal device has four antenna ports, which are port 1, port 2, port 3, and port 4, and have two power amplifiers (PAs).
- PAs power amplifiers
- the port number may also start from 0, which is not limited in the embodiment of the present application.
- the PA connects to port 1 and port 2.
- the first antenna port set is composed of port 1 and port 2
- the second antenna port set is composed of port 3 and port 4.
- the intersection of the first antenna port set and the second antenna port set is an empty set.
- the network device can obtain the channel status of port 1 and port 2 through the second reference signal, and can obtain the channel status of port 3 and port 4 through the feedback from the terminal device.
- the second antenna port set may be composed of one of port 3 and port 4, and the first antenna port set is composed of port 1 and port 2. At this time, the intersection of the first antenna port set and the second antenna port set is an empty set.
- the network device can determine the number of data layers for each terminal device. If the network device determines that it can only schedule up to 3 layers of data for the terminal device (assuming corresponding ports 1, 2 and 3), it passes After obtaining the channel status of port 1 and port 2 with the second reference signal, it is only necessary to obtain the channel status information of the other port (ie, port 3). This method may bring some performance loss, but it can reduce the reporting overhead.
- the first antenna port set is composed of port 1 and port 2
- the second antenna port set is composed of port 1, port 3, and port 4.
- the first antenna port set and the second antenna port set have an intersection, but the two are different.
- the network device can obtain the channel status of port 1 through the second reference signal, but the network device determines that the signal-to-noise ratio (SNR) of the channel of port 1 is too low, so it measures the second reference signal The obtained channel state of port 1 is inaccurate, and the terminal device can report the channel state information of port 1 by measuring the first reference signal, thereby reconstructing a more accurate channel.
- SNR signal-to-noise ratio
- the PA can connect to port 1 and port 2 at one time and switch to port 3 and port 4 at another time through the switch.
- the first antenna port set is composed of port 1, port 2, port 3, and port 4
- the second antenna port set is composed of port 3 and port 4.
- the intersection of the first antenna port set and the second antenna port set is not an empty set, but the two are different.
- An application scenario is: a terminal device periodically uses ports 1 and 2 to send a second reference signal at times n 1 + T, n 1 + 2T ..., and periodically at times n 2 + T, n 2 + 2T Ground uses ports 3 and 4 to send a second reference signal.
- the network device decides to trigger the terminal device to report the CSI.
- the second reference signal closest to time n 3 is sent by the terminal device through port 1 and port 2, so the channel state information of port 1 and port 2 can also be used, and the channel states of port 3 and port 4 The information is too old to be used. Therefore, the network device can trigger the terminal device to report the channel state information corresponding to port 3 and port 4, thereby improving the accuracy of reconstructing the channel.
- the second antenna port set may be composed of port 3 and port 4, and the first antenna port set is composed of port 1 and port 2.
- the ports where the network device obtains the channel state information through feedback from the terminal device form a second antenna port set, and the ports that obtain the channel state information only by measuring the second reference signal form the first antenna port set.
- the intersection of the first antenna port set and the second antenna port set is an empty set.
- the specific definition of the second antenna port set and the first antenna port set is not limited in this application, and only the two are restricted.
- the first indication information is a broadband parameter, or the first indication information is a subband parameter.
- the terminal device only needs to report one first indication information for the entire reported bandwidth of the CSI. If the first indication information is a subband parameter, for each subband in the CSI reporting bandwidth, the terminal device needs to report one first indication information.
- the channel state information of the first antenna port set includes first amplitude information associated with a channel matrix G u of the first antenna port set; and / or
- the channel state information of the second antenna port set includes second amplitude information associated with a channel matrix G d of the second antenna port set;
- G d is a matrix of m rows and M columns
- G u is a matrix of x rows and M columns
- M is a positive integer
- the channel matrix G u of the first antenna port set refers to a matrix composed of channel vectors corresponding to all or part of the antenna ports in the first antenna port set.
- a matrix composed of channel vectors corresponding to all antenna ports in the first antenna port set is expressed as x represents the number of ports included in the first antenna port set, and M is the number of ports of the network device that sends the first reference signal.
- the expression form of matrix G u composed of channel vectors corresponding to some antenna ports in the first antenna port set is similar. At this time, the number of rows of G u is the number of antenna ports in some antenna ports.
- the channel matrix G d of the second antenna port set is a matrix composed of channel vectors corresponding to all or part of the ports in the second antenna port set.
- a matrix composed of channel vectors corresponding to all antenna ports in the second antenna port set is expressed as m represents the number of ports included in the second antenna port set, and M is the number of ports of the network device that sends the first reference signal.
- the expression form of the matrix G d composed of channel vectors corresponding to some antenna ports in the second antenna port set is similar. At this time, the number of rows of G d is the number of antenna ports in the partial antenna ports.
- the terminal device can obtain the G u and G d matrices according to the measurement of the first reference signal.
- the above-mentioned first amplitude information associated with G u may be amplitude information of an element in the channel matrix G u , or may be one amplitude information obtained by performing some processing on all or part of the elements in G u ;
- the second amplitude information associated with d may be the amplitude information of an element in the channel matrix G d , or may be an amplitude information obtained through some processing on all or part of the elements in G d .
- the first amplitude information may be subband amplitude information or broadband amplitude information
- the second amplitude information may be subband amplitude information or broadband amplitude information, which is not limited in this embodiment of the present application.
- the first amplitude information may be a function of the amplitude.
- the first information may be a function of the amplitude of the amplitude information in an element of G u.
- the first information may be a function of the amplitude of the amplitude information G u all or part of the elements.
- the channel state information of the second antenna port set is similar to the channel state information of the first antenna port set, and details are not described herein again.
- the first indication information may be a broadband parameter or a subband parameter.
- the first indication information is a broadband parameter
- the first amplitude information and the second amplitude information are broadband amplitude information.
- the (all or part) element of the channel matrix G d of the second antenna port set or the (all or part) element of the matrix W 2, d corresponding to G d The amplitude is jointly expressed by the wideband amplitude and the subband differential amplitude.
- the terminal device reports G d
- the wideband amplitude of all or part of the elements can be normalized based on the first amplitude information, and the subband differential amplitude can be reported normally. .
- the amplitude of all or part of the elements of G d or all or part of W 2, d is directly expressed as the subband amplitude, and is not split into a wideband amplitude plus sub
- the subband amplitude of all or part of the elements may be normalized based on the first amplitude information.
- the operation of the channel matrix G u of the first antenna port set by the network device is similar to the operation of the terminal device on G d , and details are not described herein again.
- the first indication information is a subband parameter
- the first amplitude information and the second amplitude information are subband amplitude information.
- the amplitude of the (all or part) element of G d or the (all or part) element of W 2, d is directly expressed as the subband amplitude, and is not split into broadband
- the sub-band amplitude of the above element can be normalized with the sub-band amplitude of the first amplitude information as a reference.
- the operation of the channel matrix G u of the first antenna port set by the network device is similar to the operation of the terminal device on G d , and details are not described herein again.
- the foregoing channel state information is power information, and power is a square of an amplitude, so it can also be understood that the foregoing channel state information is a function of amplitude.
- the first amplitude information is determined according to any one of the following elements:
- G u at least one row of elements in the largest amplitude value of the information element, the corresponding matrix G u W 2, u at least one element of the maximum amplitude value of the information element, at least a singular value of G u of the maximum value of the amplitude information singular value, at least one characteristic value G u amplitude takes the value of the maximum eigenvalue; and / or
- the second amplitude information is determined according to any one of the following elements:
- At least one line element G D reach a maximum value of the amplitude information elements, d corresponding to the G matrix W 2, d of at least one element of the maximum amplitude value of the information element, the at least one characteristic value D G takes the value of the maximum amplitude The singular value with the largest amplitude information among at least one singular value of the characteristic value of G d ;
- the first amplitude information is determined according to an element with the largest amplitude information value in at least one row of elements of G u
- the second amplitude information is based on the amplitude information in at least one row of elements of G d
- the element with the largest value is determined.
- W 1 is a block diagonal array
- A [b 1 , b 2 , ... b L ] is composed of L basis vectors
- N 2L.
- W 1 is a wideband parameter
- W 2, u and W 2, d include wideband parameters (for example, wideband amplitude) and subband parameters (for example, subband differential amplitude and subband phase), or W 2, u , W 2, d includes subband parameters (such as subband amplitude and subband phase).
- the terminal device can represent G u and G d by feeding back the index of the parameter of W 1 and the index of the parameter of W 2 .
- the amplitude information is the first value determined according to the largest element of at least one row of elements G u amplitude information, the amplitude information is a second matrix corresponding to G d W 2, d
- the first amplitude information is directly determined according to the channel matrix G u , which can prevent the terminal device from decomposing the dual codebook structure of G u , and the network device does not need to perform dual code on the uplink channel matrix when reconstructing the complete channel state matrix
- the decomposition of this structure can reduce the complexity of network equipment and terminal equipment while obtaining accurate channel state information.
- the first amplitude information is determined according to a singular value having the largest amplitude information among at least one singular value of G u , and the second amplitude information is based on at least one singular value of G d The singular value with the largest amplitude information is determined.
- the first amplitude information is determined according to a feature value that has the largest amplitude information value among at least one characteristic value of G u , and the second amplitude information is based on at least one feature value of G d The feature value with the largest amplitude information is determined.
- the amplitude of the first amplitude information of the first information element is an element in G u, G u corresponding matrix W 2, u the elements, the G u Singular values or eigenvalues of G u ; and / or
- the second element is an element in G D, d corresponding to the G matrix W 2, d elements, or singular values D G G D of .
- the amplitude information is the first value determined according to the largest element of at least one row of elements G u amplitude information, or the amplitude of the first amplitude information of the first information element, said The index of the first element is predefined;
- the second amplitude information includes n sub-elements, and the i-th sub-element of the n sub-elements is determined according to the element with the largest amplitude information among the M elements of the i-th row in the n-th row of G d , n is a positive integer , I ⁇ ⁇ 1,2, ..., n ⁇ .
- the first amplitude information is determined according to an element with the largest amplitude information value in at least one column of the matrix W 2, u corresponding to Gu, or the first amplitude information is the first Element amplitude information, and the index of the first element is predefined;
- the second amplitude information comprises n sub-elements, the i-th element of the n elements is a child element of G d N matrix corresponding to W 2, d n-th column of the i-th column of the amplitude information element Certainly, n is a positive integer, i ⁇ ⁇ 1,2, ..., n ⁇ ;
- n is greater than or equal to two.
- At least one row of G d includes n rows, n is a positive integer, and the method further includes:
- Second indication information is used to indicate that, in addition to the second element, the amplitude information of the remaining n-1 third elements except the second element
- the difference value of the amplitude information of two elements, wherein the i-th third element of the n third elements is determined according to the element with the largest amplitude information among the M elements of the i-th row in the n rows.
- the second amplitude information is determined according to the amplitude information of the second element.
- At least one column in the matrix W 2, d includes n columns, where n is a positive integer, and the method further includes:
- third indication information Sending, by the terminal device, third indication information, where the third indication information is used to indicate that in addition to the second element, the amplitude information of the remaining n-1 fourth elements out of the n fourth elements is related to the first fourth element;
- the second amplitude information is determined according to the amplitude information of the second element.
- the method further includes: the terminal device sends fourth indication information, where the fourth indication information is used to indicate an index of the first element and / or an index of the second element .
- the index of the first element is predefined; and / or the index of the second element is predefined.
- the first amplitude information is determined based on amplitude information of at least two elements of G u, or, the first amplitude information in accordance with at least two corresponding matrix G u W 2, u is Determined by the amplitude information of each element; and / or
- the second amplitude information is determined according to the amplitude information of at least two elements of G d ; or the second amplitude information is determined according to the amplitude information of at least two elements of the matrix W 2, d corresponding to G d ;
- what is determined according to the amplitude information may be determined according to a function of the amplitude information of at least two elements.
- the above function may be a sum of amplitude information of at least two elements, or an average value of amplitude information of at least two elements (for example, arithmetic average, geometric average, root mean square average, or Weighted average, etc.).
- the average value of the element amplitude information may be the average value of the wideband amplitude information or the average value of the subband amplitude information.
- the mean value of all elements of a matrix X with a row and b column is defined as: Represents the magnitude of the i-th row and j-th column of X, and p is a natural number.
- the average value of the broadband amplitude information of all elements of G u is: or or, or, wherein G u (f) is G u f-subbands in the values, including the entire F CSI reported by the bandwidth subbands;
- WB represents G u i-th row j-th column element Broadband amplitude value; p is a natural number.
- the average value of all elements of G u subband amplitude information as:
- the first amplitude information is determined according to an average value of the amplitude information of at least two elements of the matrix W 2, u corresponding to G u
- the second amplitude information is corresponding according to G d
- the average value of the broadband amplitude information of all elements of W 2, u is: or p is a natural number, or, or
- the average amplitude of all of the elements of the sub-band information is u:
- the foregoing determination based on the average value may include the average value itself or a function determined based on the average value, for example, a sum value of amplitude information of all or part of the elements, where the sum value is an average value
- the multiples of this are not limited in the embodiments of the present application.
- the average value mentioned in the embodiment of the present application may be an arithmetic average, or a geometric average, a root mean square average, or a weighted average, which is not limited in the embodiment of the present application.
- the first amplitude information is determined according to a sum of the amplitude information of at least two elements of G u , and the second amplitude information is based on the amplitude information of at least two elements of G d Determined by the summation of; or
- the first information is based on the amplitude u G matrix corresponding to W 2, the amplitude sum is determined of at least two information elements u of the second amplitude information is 2, d is at least according to the corresponding matrix W G d The sum of the amplitude information of the two elements is determined.
- the weighted summation of at least two element amplitude information may be a weighted summation of wideband amplitude information or a weighted summation of subband amplitude information.
- the above determination based on the summation may include the summation value of the amplitude information itself, or the function determined by the summation value, for example, the summation value of the amplitude information of at least two elements, where the amplitude information is the summation
- the multiple of the value is not limited in the embodiment of the present application.
- the first amplitude information is determined according to the norm information of G ′ u
- the second amplitude information is determined according to the norm information of G ′ d
- G ′ u includes at least two elements of G u
- G ′ d includes at least two elements of G d .
- the matrix G 'u norm may be information G' u p subbands norm function of the number, may be G 'function of the number of broadband u p-norm, a subband may also be the average norm p
- This function is not limited in the embodiment of the present application, where p is a natural number.
- the p-norm can be a Frobenius norm.
- G ′ u G u is taken as an example for description below.
- the p-norm of a matrix X with a row and b column is: X ij represents an element in the i-th row and j-th column of X.
- the aforementioned p-norm function may be the p-th power of the p-norm:
- G u broadband p-norm can be defined as: or G u (f) is the value of G u on the f-th subband, and the entire CSI reporting bandwidth includes F subbands.
- G u broadband p-norm can be defined as Among them,
- WB represents the wideband amplitude value of the i-th row and j-th column of G u .
- the norm information of G d is similar to the norm information of G u , which is not repeated here.
- the first amplitude information is determined according to the norm information of the matrix W 2, u corresponding to G ′ u , and the second amplitude information is based on the matrix W 2 corresponding to G ′ d
- the norm information of d is determined, where, X T represents the transpose of matrix X, X (l u ) represents the l u column of matrix X, X (l d ) represents the l d column of matrix X, W 1 is a matrix of M * N, W 2, u Is a matrix of N * x, W 2, d is a matrix of N * m, N is a positive integer, l u ⁇ ⁇ 1,2, ..., x ⁇ , l d ⁇ ⁇ 1,2, ..., m ⁇ .
- the matrix W 2, u norm information may be W 2, u subband function of the number of the p-norm, may be W 2, u broadband p-norm function of the number may still be sub-band p-norm
- the function of the average value is not limited in the embodiment of the present application, where p is a natural number. Specifically, the definition of the p-norm is similar to the above definition, and is not repeated here.
- the first antenna port set is predefined, determined by the terminal device according to a configuration of a network device, or determined by a terminal capability reported by the terminal device; and / or
- the second antenna port set is predefined, determined by the terminal device according to a configuration of a network device, or determined according to a terminal capability reported by the terminal device.
- the foregoing first antenna port set may be predefined, or may be configured by the network device for the terminal device (that is, determined by the terminal device according to the configuration of the network device), or may be determined by the terminal device according to its own capabilities. This is not limited in the embodiments of the present application.
- the above-mentioned second antenna port set may be predefined, or configured by the network device for the terminal device (that is, determined by the terminal device according to the configuration of the network device), or may be determined by the terminal device according to its own capabilities This embodiment is not limited to this.
- the first antenna port set and the second antenna port set may be predefined.
- the second antenna port set and the second antenna port set may be predefined to send the second k times closest to the time when the network device triggers the terminal device to report channel state information.
- the antenna ports of the reference signal constitute the first antenna port set, and the remaining other antenna ports among the y antenna ports of the terminal device are the second antenna port set, and k is a positive integer.
- the first antenna port set and the second antenna port set may be determined according to a configuration of a network device.
- the network device may indicate, through the configuration information, which antenna ports the terminal device reports the channel status information to. These antenna ports are the second antenna port set. The remaining antenna ports among the y antenna ports of the terminal device are Make up the first antenna port set.
- the network device may indicate to which antenna ports the channel state information reported by the terminal device is not directed, and these antenna ports form a first antenna port set, and other antenna ports form a second antenna port set.
- the specific indication manner may be a direct indication or an indirect indication, which is not limited in the embodiment of the present application. If a direct instruction is used, the network device may indicate the port number of the antenna port, and if an indirect instruction is used, the network device may indicate the port number of the antenna port.
- the first antenna port set and the second antenna port set may be determined according to a terminal capability, and the terminal capability may be reported by the terminal device to the network device. For example, if the terminal device reports itself as 2 transmitting and 4 receiving (2T4R), the first antenna port set is 2 antenna ports out of the 4 antenna ports, and the second antenna port set is 4 antenna ports except the above 2 antenna ports. The other 2 antenna ports.
- the first antenna port set and / or the second antenna port set are configuration information carried in at least one of the following signalings sent by the terminal device through the network device. Determined: radio resource control RRC, multiple access control MAC control element CE, and downlink control information DCI.
- the network device may send radio resource control (radio control, RRC) signaling to the terminal device, Multiple access control (multiple access control) MCA control element (CE) signaling and downlink control information (downlink control information (DCI) signaling) to configure the first antenna port set and / Or a second antenna port set.
- RRC radio resource control
- MCA Multiple access control
- DCI downlink control information
- the network device may indicate configuration information reported by the channel state information through RRC signaling, and the configuration information may be directly used to determine the first antenna port set and / or the second antenna port set. After receiving the configuration information, the terminal device can determine the first antenna port set and / or the second antenna port set according to the configuration information. Optionally, the reporting of the channel state information is periodic.
- RRC + DCI The network device may indicate configuration information reported by the channel state information through RRC signaling, and the configuration information may be used to determine the first antenna port set and / or the second antenna port set.
- the network device triggers the terminal device to report channel state information through DCI.
- the reporting of the channel state information is aperiodic or semi-persistent.
- the terminal device is 2T4R and supports antenna selection.
- the network device may indicate configuration information reported by the channel state information through RRC signaling, and the configuration information may determine that the second antenna port set includes all antenna ports among the four antenna ports of the terminal device. Since only two antenna ports send the second reference signal at a time, the network device can select which two antenna ports among the four antenna ports that are not targeted or targeted for the current report through DCI. For example, the numbers of the four ports are 0, 1, 2, and 3, and the network device may select the ports targeted for this report through port 1 and port 2. Therefore, the terminal device determines that the first antenna port set includes ports. 1 and port 2, and the second antenna port set includes port 3 and port 4.
- a larger set is configured through RRC, and DCI selects a subset in the set as the first antenna port set, which is more flexible and can reduce the number of channel state information reports configured by RRC. For example, if two of the four antenna ports of the terminal device have low channel SNR, the SRS measurement of these two antenna ports will be very inaccurate, resulting in inaccurate precoding of downlink data. By DCI triggering the channel status feedback of the two antenna ports, the accuracy of the channel information of the two ports can be improved.
- RRC + MAC CE + DCI Network equipment can send configuration information through RRC to indicate multiple possible antenna port sets, and then select a part of the antenna port set from multiple possible antenna port sets as alternatives through MAC CE Set, and finally select an antenna port set from the candidate set through DCI as the first antenna port set and / or the second antenna port set corresponding to this report.
- the first reference signal is a channel state information reference signal CSI-RS; and / or the second reference signal is a sounding reference signal SRS.
- the intersection of the first antenna port set and the second antenna port set is an empty set.
- the principle of the example where the intersection of the first antenna port set and the second antenna port set is not an empty set is the same as that of the example where the intersection of the first antenna port set and the second antenna port set is an empty set. List.
- the terminal device has a total of x + m receiving antenna ports, of which x ports can also be used as transmitting antenna ports, and m ports cannot be used as transmitting antenna ports.
- the m ports are called non-transmitting antenna ports.
- the x antenna ports transmitting SRS may be configured by a network device.
- a network device can send CSI-RS through M antenna ports, and a terminal device estimates the downlink channel matrix of x + m receiving antenna ports from the network device to the terminal device by measuring the CSI-RS. among them, Including downlink channel vectors of m antenna ports (that is, the foregoing second antenna port set) from the network device to the terminal device, Represents the power factor associated with network equipment sending CSI-RS.
- G csi-rs, u is the above-mentioned G u
- G csi-rs, d is the above-mentioned G d .
- the information reported by the terminal equipment can be divided into the following situations:
- the terminal equipment uses the explicit feedback method to feed back the relevant information of the channel matrix G csi-rs, d .
- the terminal device feedbacks the channel vectors of the m non-transmitting antenna ports element by element, and the relative power values between the channels of the m non-transmitting antenna ports and the channels of the x transmit antenna ports (that is, the first indication information above) .
- the specific feedback methods are as follows:
- the terminal device can determine the wideband amplitude value of the element at position l 1 in the x channel vectors corresponding to the first antenna port set based on the CSI-RS measurement.
- l 1 may be predefined or selected by the terminal device. If l 1 is selected by the terminal device, the terminal device needs to report the information of l 1 , that is, PMI 1,0 .
- the terminal device may report at least one of the following information:
- the broadband feedback PMI 1,1, i indicates the position of the element with the largest broadband amplitude among the M elements of H d, i , denoted as l 2, i ;
- the wideband feedback PMI 1,2, i indicates the wideband amplitude of the element H d, i at the above position l 2, i
- the ratio of the ratio is recorded as x l2, i (that is, part of the content indicated by the first indication information);
- the sub-band feedback PMI 2, i indicates the sub-band differential amplitude z i, j and the sub-band phase u i, j of the M elements of H d, i on each sub-band.
- the quantization interval of the foregoing broadband amplitude ratio x l2, i can be [-X, X] dB, X is a positive integer, and the quantization interval can be Y dB, that is, the quantized ratio is a set ⁇ -X, -X + Y, -X + 2Y, ..., XY, X ⁇ .
- the channel matrix corresponding to the i-th port that the network device can recover based on the PMI reported by the terminal device is:
- Network equipment reconstructs the complete channel matrix:
- the network device may further obtain a precoding matrix of downlink data according to the channel matrix.
- l 1 and l 2, i indicate information related to wideband amplitude, and therefore, the first indication information is a wideband parameter.
- the TDD system by reporting or predefining the normalized element position (l 1 ), and reporting the difference value of the channel information between the transmitting antenna port and the non-transmitting antenna port (that is, the above-mentioned x l2, i ), the TDD system can be solved without a channel In the reciprocity feedback scheme, the precoding matrix is inaccurate due to different transmission powers of SRS and CSI-RS.
- the terminal device may use the dual codebook structure to feed back the channel vectors of the m non-transmitting antenna ports, and the difference between the channel information of the m non-transmitting antenna ports and the channel information of the x transmitting antenna ports.
- the specific feedback methods are as follows:
- Report PMI 1,1 , PMI 1,1 indicates a set of DFT beams b 0 , ..., b I-1 selected for the entire bandwidth, and these beams form the W 1 matrix I is a positive integer;
- the terminal device can report at least one of the following information:
- the broadband feedback PMI 1,0 , PMI 1,0 indicates the position l 1 of an element G csi-rs, u over the entire bandwidth.
- l 1 may be predefined, and the terminal device does not need to report PMI 1,0 at this time;
- WB is to limit the value range of the broadband amplitude of the 2I-1 elements other than the position l 2, i It is between 0 and 1.
- the fixed quantization interval facilitates quantization of these wideband amplitudes and reduces the number of quantization bits.
- the quantization interval of the wideband amplitude ratio x l2, i can be [-X, X] dB, X is a positive integer, and the quantization interval can be Y dB, that is, the quantized ratio is a set ⁇ -X, -X + Y , -X + 2Y, ..., XY, X ⁇ .
- the subband feedback PMI 2, i indicates the subband differential amplitude z i, j and the subband phase u i, j of the M elements of W 2, i on each subband.
- the network device can reconstruct the complete channel matrix. Specifically, the network device may use the broadband amplitude value of the element at position l 1 in G srs according to PMI 1,0 (assuming it is expressed as ) As a reference to normalize G srs so as to eliminate the influence of SRS transmission power factor, and obtain According to other PMIs, the network device can recover the channel of the i-th non-transmitting antenna port, which has eliminated the influence of the CSI-RS transmit power factor:
- the precoding matrix obtained by the network device based on the channel matrix is accurate and is no longer affected by different transmission power factors of the SRS and the CSI-RS.
- the embodiment of the present application uses a dual codebook structure, and reports or predefines a normalized element position (l 1 ), and reports a difference value of the channel information between the transmitting antenna port and the non-transmitting antenna port (ie, the above-mentioned x l2, i ), It can solve the problem of inaccurate precoding matrix due to the different transmission power of SRS and CSI-RS in the feedback scheme when the TDD system has no channel reciprocity.
- the first amplitude information is directly determined according to the channel matrix G u , which can prevent the terminal device from decomposing the dual codebook structure of G u , and the network device does not need to perform the uplink channel matrix G when reconstructing the complete channel state matrix.
- SRS decomposition of the dual codebook structure can reduce the complexity of network equipment and terminal equipment while obtaining accurate channel state information.
- the terminal device may use the dual codebook structure to feed back the channel vectors of the m non-transmitting antenna ports, and the difference between the channel information of the m non-transmitting antenna ports and the channel information of the x transmitting antenna ports.
- the specific feedback methods are as follows:
- Report PMI 1,1 , PMI 1,1 indicates a set of DFT beams b 0 , ..., b I-1 selected for the entire bandwidth, and these beams form the W 1 matrix I is a positive integer;
- the terminal device can report at least one of the following information:
- PMI 1,0 indicates the above-mentioned element position l 1 over the entire bandwidth.
- l 1 may be predefined, and the terminal device does not need to report PMI 1,0 at this time;
- wideband feedback PMI 1,1, i, i indicates the first matrix W 2, 2I elements i of the maximum amplitude of the broadband element positions l 2, i;
- WB is to limit the value range of the broadband amplitude of the 2I-1 elements other than the position l 2, i It is between 0 and 1.
- the fixed quantization interval facilitates quantization of these wideband amplitudes and reduces the number of quantization bits.
- the sub-band feedback PMI 2, i indicates the sub-band differential amplitude z i, j and the sub-band phase u i, j of the 2I elements of W 2, i on the sub-band f.
- the quantization interval of the wideband amplitude ratio x l2, i can be [-X, X] dB, X is a positive integer, and the quantization interval can be Y dB, that is, the quantized ratio is a set ⁇ -X, -X + Y , -X + 2Y, ..., XY, X ⁇ .
- the network device can reconstruct the complete channel matrix. Specifically, the network device can be obtained according to PMI 1,1 and PMI 1,0 .
- the wideband amplitude value of the element at position l 1 in the corresponding W 2 matrix (assume expressed as )
- the precoding matrix obtained by the network device based on the channel matrix is accurate and is no longer affected by different transmission power factors of the SRS and the CSI-RS.
- the network device measures the SRS sent by the x transmit antenna ports and obtains
- the network device sends CSI-RS through M antenna ports, and the terminal device estimates the channel from the network device to its own x + m receiving antenna ports by measuring the CSI-RS.
- Each feature value indication information indicates the r-th feature value of G csi-rs, d With a certain eigenvalue of G csi-rs, u (Can be selected by the terminal device, or it can be predefined)
- the feedback method of the feature vector may adopt the double codebook structure of the prior art, which is not repeated here.
- the terminal device If It is selected by the terminal device, and the terminal device also needs to feed back the index i 0 of the characteristic value (similar to l 1 in the above embodiment), if it is predefined (for example, the maximum characteristic value of G csi-rs, u ), It is not necessary to feed back the index of the feature value.
- the quantization interval can be [-X, X] dB, X is a positive integer, and the quantization interval can be Y dB, that is, the quantized ratio is the set ⁇ -X, -X + Y, -X + 2Y, ..., XY, X ⁇ .
- the network device may perform an evaluation on the characteristic value of G srs according to the index i 0 of the characteristic value fed back by the terminal device. Normalize to obtain Eliminate the impact of SRS transmit power factor.
- the network device may according to G csi-rs, R feature vectors of d and corresponding feature value indication information (indication ), Get normalized This part of the information is not affected by the CSI-RS transmission power factor. Ideally,
- the network device can finally obtain the correlation matrix of the complete channel matrix:
- the precoding matrix is obtained based on the correlation matrix, and is not affected by different transmission power factors of the two reference signals.
- the terminal device feeds back the eigenvalue information and eigenvector information of the non-sending antenna port channel, so that the network device can recover the complete correlation matrix of the downlink channel matrix.
- the terminal device feedbacks the correlation matrix of the transmit antenna port channel for the position of the non-transmit antenna port characteristic value normalization element (the above index i 0 ), and feedbacks the characteristic value of the transmit antenna port channel and the non-transmit antenna port channel. Ratio of eigenvalues (above It can solve the problem of inaccurate precoding matrix caused by different transmission power of SRS and CSI-RS.
- the terminal device may feedback the related information of the channel matrix G csi-rs, d by adopting an explicit feedback method. For example, the terminal device feedbacks the channel vectors of the m non-transmitting antenna ports element by element, and the relative power values between the channels of the m non-transmitting antenna ports and the channels of the x transmit antenna ports (that is, the first indication information above) . It is assumed that the reporting bandwidth of the CSI includes F subbands.
- the specific feedback methods are as follows:
- the terminal device can determine the subband amplitude value of the element at position l 1 (f) in the x channel vectors corresponding to the first antenna port set on the fth subband based on the CSI-RS measurement.
- l 1 (f) may be predefined or selected by the terminal device. If l 1 (f) is selected by the terminal device, the terminal device reports the information of l 1 (f), that is, PMI 0 .
- the terminal device may Report at least one of the following information:
- Feedback PMI 3, i indicating the ratio of the subband amplitude of the elements at the remaining M-1 positions of H d, i on the fth subband to
- the feedback PMI 4, i indicates the sub-band phase u i, j of the M elements of H d, i on the f-th sub-band.
- the quantization interval of the amplitude ratio xl2, i (f) may be [-X, X] dB, X is a positive integer, and the quantization interval may be Y dB, that is, the quantized ratio is a set ⁇ -X, -X + Y, -X + 2Y, ..., XY, X ⁇ .
- the identification of the subband f will be omitted later in this embodiment.
- the network device can recover the f-th subband according to the PMI reported by the terminal device.
- the channel matrix corresponding to the i-th port is:
- H d, i ′ does not include the influence of the CSI-RS transmission power factor. Then the network device can get the channel matrix of m antenna ports
- the network device can measure the channel matrix on the f-th subband according to the SRS Normalize all elements of the element based on the wideband amplitude of the element at the above position l 1 (f)
- Network equipment reconstructs the complete channel matrix:
- the network device may further obtain a precoding matrix of downlink data according to the channel matrix.
- l 1 (f) and l 2, i (f) indicate information related to the subband amplitude. Therefore, the first indication information is a subband parameter.
- the normalized element position (l 1 (f)) is reported or predefined, and the difference value of the channel information between the transmitting antenna port and the non-transmitting antenna port is reported (ie, the above-mentioned x l2, i (f)), It can solve the problem of inaccurate precoding matrix due to the different transmission power of SRS and CSI-RS in the feedback scheme when the TDD system has no channel reciprocity.
- FIG. 4 shows an apparatus 400 for reporting channel state information provided in an embodiment of the present application.
- the apparatus 400 may be a terminal device in the foregoing embodiment, or may be a chip in the terminal device.
- the device 400 includes:
- the obtaining unit 410 is configured to obtain first indication information, where the first indication information is used to indicate a difference value between channel state information of a first antenna port set and channel state information of a second antenna port set, where the The first antenna port set includes x antenna ports of the device, the second antenna port set includes m antenna ports of the device, and the first antenna port set is different from the second antenna port set, x And m are positive integers;
- the transceiver unit 420 is configured to send the first indication information.
- the apparatus for reporting channel state information in the embodiment of the present application reports the difference value of the channel state information between the two antenna ports by the terminal device, so that the network device can eliminate the influence of different transmission powers of the network device and the terminal device according to the difference value. , It is beneficial to improve the accuracy of the channel state information obtained by the network equipment, thereby improving the data transmission performance.
- the first indication information is a broadband parameter, or the first indication information is a subband parameter.
- the channel state information of the first antenna port set includes first amplitude information associated with a channel matrix G u of the first antenna port set; and / or
- the channel state information of the second antenna port set includes second amplitude information associated with a channel matrix G d of the second antenna port set;
- G d is a matrix of m rows and M columns
- G u is a matrix of x rows and M columns
- M is a positive integer
- the first amplitude information is determined based on any of the following elements: at least one line element G u amplitude information of the maximum value of the elements, the corresponding matrix G u W 2, u at least one element of the amplitude the maximum value of the information element, at least a singular value of G u of the maximum value of the amplitude information of the singular values, at least one characteristic value G u amplitude takes the value of the maximum eigenvalue; and / or
- the second amplitude information is determined according to any one of the following elements: an element having the largest amplitude information value in at least one row of the elements of G d , and having the largest amplitude information value in at least one column of the elements corresponding to G d in the matrix W 2, d elements, at least one characteristic value G d takes the value of the maximum amplitude value characteristic, the at least one singular value of G d takes the value of the maximum amplitude of the singular values;
- the amplitude information is the first value determined according to the largest element of at least one row of elements G u amplitude information;
- the second amplitude information includes n sub-elements, and the i-th sub-element of the n sub-elements is determined according to the element with the largest amplitude information among the M elements of the i-th row in the n-th row of G d , n is a positive integer , I ⁇ ⁇ 1,2, ..., n ⁇ .
- the first amplitude information is determined according to an element with the largest amplitude information value in at least one column of the matrix W 2, u corresponding to Gu;
- the second amplitude information comprises n sub-elements, the i-th element of the n elements is a child element of G d N matrix corresponding to W 2, d n-th column of the i-th column of the amplitude information element Certainly, n is a positive integer, i ⁇ ⁇ 1,2, ..., n ⁇ ;
- the first amplitude information is determined according to an average value of amplitude information of at least two elements of G u
- the second amplitude information is determined according to an average value of amplitude information of at least two elements of G d ;
- the first amplitude information is determined according to an average value of the amplitude information of at least two elements of the matrix W 2, u corresponding to G u , and the second amplitude information is based on at least the matrix W 2, d corresponding to G d
- the first antenna port set is predefined, determined according to a configuration of a network device, or determined according to a terminal capability reported by a terminal device; and / or
- the second antenna port set is predefined, determined according to a configuration of a network device, or determined according to a terminal capability reported by a terminal device.
- the first antenna port set and / or the second antenna port set are determined by configuration information carried in at least one of the following signaling:
- Radio resource control RRC Radio resource control RRC, multiple access control MAC control element CE and downlink control information DCI.
- the transceiver unit 420 is further configured to perform at least one of the following steps:
- the first reference signal is a channel state information reference signal CSI-RS; and / or the second reference signal is a sounding reference signal SRS.
- the device 400 here is embodied in the form of a functional unit.
- the term "unit” herein may refer to an application-specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a proprietary processor, or a group of processors) for executing one or more software or firmware programs. Processors, etc.) and memory, merge logic, and / or other suitable components that support the functions described.
- ASIC application-specific integrated circuit
- processor such as a shared processor, a proprietary processor, or a group of processors
- memory merge logic, and / or other suitable components that support the functions described.
- the apparatus 400 may specifically be a terminal device in the foregoing embodiment, and the apparatus 400 may be configured to execute various processes and / or steps corresponding to the terminal device in the foregoing method embodiment, To avoid repetition, we will not repeat them here.
- FIG. 5 shows another apparatus 500 for reporting channel state information provided by an embodiment of the present application.
- the apparatus 500 may be a network device in the foregoing embodiment, or may be a chip in a network device.
- the device 500 includes:
- a sending unit 510 configured to send a first reference signal
- the receiving unit 520 is configured to receive first indication information obtained by a terminal device according to the first reference signal, where the first indication information is used to indicate channel state information of a first antenna port set and channel state of a second antenna port set The difference between the information, wherein the first antenna port set includes x antenna ports of the terminal device, the second antenna port set includes m antenna ports of the terminal device, and the first antenna The port set is different from the second antenna port set, and x and m are positive integers.
- the apparatus for reporting channel state information in the embodiment of the present application reports the difference value of the channel state information between the two antenna ports by the terminal device, so that the network device can eliminate the influence of different transmission powers of the network device and the terminal device according to the difference value. , It is beneficial to improve the accuracy of the channel state information obtained by the network equipment, thereby improving the data transmission performance.
- the first indication information is a broadband parameter, or the first indication information is a subband parameter.
- the channel state information of the first antenna port set includes first amplitude information associated with a channel matrix G u of the first antenna port set; and / or
- the channel state information of the second antenna port set includes second amplitude information associated with a channel matrix G d of the second antenna port set;
- G d is a matrix of m rows and M columns
- G u is a matrix of x rows and M columns
- M is a positive integer
- the first amplitude information is determined based on any of the following elements: at least one line element G u amplitude information of the maximum value of the elements, the corresponding matrix G u W 2, u at least one element of the amplitude the maximum value of the information element, at least a singular value of G u of the maximum value of the amplitude information of the singular values, at least one characteristic value G u amplitude takes the value of the maximum eigenvalue; and / or
- the second amplitude information is determined according to any one of the following elements: an element having the largest amplitude information value in at least one row of the elements of G d , and having the largest amplitude information value in at least one column of the elements corresponding to G d in the matrix W 2, d elements, at least one characteristic value G d takes the value of the maximum amplitude value characteristic, the at least one singular value of G d takes the value of the maximum amplitude of the singular values;
- the amplitude information is the first value determined according to the largest element of at least one row of elements G u amplitude information;
- the second amplitude information includes n sub-elements, and the i-th sub-element of the n sub-elements is determined according to the element with the largest amplitude information among the M elements of the i-th row in the n-th row of G d , n is a positive integer , I ⁇ ⁇ 1,2, ..., n ⁇ .
- the first amplitude information is determined according to an element with the largest amplitude information value in at least one column of the matrix W 2, u corresponding to Gu;
- the second amplitude information comprises n sub-elements, the i-th element of the n elements is a child element of G d N matrix corresponding to W 2, d n-th column of the i-th column of the amplitude information element Certainly, n is a positive integer, i ⁇ ⁇ 1,2, ..., n ⁇ ;
- the first amplitude information is determined according to an average value of amplitude information of at least two elements of G u
- the second amplitude information is determined according to an average value of amplitude information of at least two elements of G d ;
- the first amplitude information is determined according to an average value of the amplitude information of at least two elements of the matrix W 2, u corresponding to G u , and the second amplitude information is based on at least the matrix W 2, d corresponding to G d
- the first antenna port set is predefined, determined according to a configuration of a network device, or determined according to a terminal capability reported by a terminal device; and / or
- the second antenna port set is predefined, determined according to a configuration of a network device, or determined according to a terminal capability reported by a terminal device.
- the first antenna port set and / or the second antenna port set are determined by configuration information carried in at least one of the following signaling: radio resource control RRC, multiple access control MAC Control element CE and downlink control information DCI.
- RRC radio resource control
- CE multiple access control MAC Control element CE
- DCI downlink control information
- the receiving unit 520 is further configured to perform at least one of the following steps: receiving channel state information of the second antenna port set; receiving a first channel sent by the terminal device through the first antenna port set Two reference signals.
- the first reference signal is a channel state information reference signal CSI-RS; and / or the second reference signal is a sounding reference signal SRS.
- the apparatus 500 here is embodied in the form of a functional unit.
- the term "unit” herein may refer to an application-specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a proprietary processor, or a group of processors) for executing one or more software or firmware programs. Processors, etc.) and memory, merge logic, and / or other suitable components that support the functions described.
- ASIC application-specific integrated circuit
- processor such as a shared processor, a proprietary processor, or a group of processors
- memory merge logic, and / or other suitable components that support the functions described.
- the apparatus 500 may be specifically a network device in the foregoing embodiment, and the apparatus 500 may be configured to execute various processes and / or steps corresponding to the network device in the foregoing method embodiment, To avoid repetition, we will not repeat them here.
- the apparatus 400 and the apparatus 500 of each of the foregoing solutions have a function of implementing corresponding steps performed by the terminal device and the network device in the foregoing method; the functions may be implemented by hardware, or may be implemented by hardware executing corresponding software.
- the hardware or software includes one or more modules corresponding to the above functions; for example, the transmitting unit may be replaced by a transmitter, the receiving unit may be replaced by a receiver, and other units, such as a determination unit, may be replaced by a processor and executed separately. Sending and receiving operations and related processing operations in various method embodiments.
- the device in FIG. 4 and FIG. 5 may also be a chip or a chip system, for example, a system on chip (SoC).
- the receiving unit and the transmitting unit may be the transceiver circuit of the chip, which is not limited herein.
- FIG. 6 shows another apparatus 600 for reporting channel state information provided by an embodiment of the present application.
- the device 600 includes a processor 610, a transceiver 620, and a memory 630.
- the processor 610, the transceiver 620, and the memory 630 communicate with each other through an internal connection path.
- the memory 630 is used to store instructions, and the processor 610 is used to execute the instructions stored in the memory 630 to control the transceiver 620 to send signals and / Or receive a signal.
- the processor 610 is configured to obtain first indication information, where the first indication information is used to indicate a difference between channel state information of the first antenna port set and channel state information of the second antenna port set, where:
- the first antenna port set includes x antenna ports of the device, the second antenna port set includes m antenna ports of the device, and the first antenna port set is different from the second antenna port set , X and m are positive integers;
- the transceiver 620 is configured to send the first indication information.
- the apparatus 600 may be specifically a terminal device in the foregoing embodiment, and may be used to execute various steps and / or processes corresponding to the terminal device in the foregoing method embodiment.
- the memory 630 may include a read-only memory and a random access memory, and provide instructions and data to the processor. A portion of the memory may also include non-volatile random access memory.
- the memory may also store information about the type of device.
- the processor 610 may be configured to execute instructions stored in the memory, and when the processor 610 executes the instructions stored in the memory, the processor 610 is configured to execute each step of the foregoing method embodiment corresponding to the terminal device and / Or process.
- FIG. 7 illustrates another apparatus 700 for reporting channel state information according to an embodiment of the present application.
- the device 700 includes a processor 710, a transceiver 720, and a memory 730.
- the processor 710, the transceiver 720, and the memory 730 communicate with each other through an internal connection path.
- the memory 730 is used to store instructions.
- the processor 710 is used to execute the instructions stored in the memory 730 to control the transceiver 720 to send signals and / Or receive a signal.
- the transceiver 720 is configured to send a first reference signal; and receive first indication information obtained by the terminal device according to the first reference signal, where the first indication information is used to indicate channel state information of the first antenna port set and A difference value between channel state information of a second antenna port set, wherein the first antenna port set includes x antenna ports of the terminal device, and the second antenna port set includes m terminal devices Antenna port.
- the first antenna port set is different from the second antenna port set, and x and m are positive integers.
- the apparatus 700 may be specifically a network device in the foregoing embodiment, and may be used to execute various steps and / or processes corresponding to the network device in the foregoing method embodiment.
- the memory 730 may include a read-only memory and a random access memory, and provide instructions and data to the processor. A portion of the memory may also include non-volatile random access memory.
- the memory may also store information about the type of device.
- the processor 710 may be configured to execute an instruction stored in a memory, and when the processor 710 executes an instruction stored in a memory, the processor 610 is configured to execute each step of the foregoing method embodiment corresponding to the network device and / Or process.
- the processor of the foregoing device may be a central processing unit (CPU), and the processor may also be another general-purpose processor, a digital signal processor (DSP), or an application-specific integrated circuit. (ASIC), field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
- a general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
- each step of the above method may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software.
- the steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as being executed by a hardware processor, or executed and completed by a combination of hardware and software units in the processor.
- the software unit may be located in a mature storage medium such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, and the like.
- the storage medium is located in a memory, and the processor executes instructions in the memory and completes the steps of the foregoing method in combination with its hardware. To avoid repetition, it will not be described in detail here.
- the disclosed systems, devices, and methods may be implemented in other ways.
- the device embodiments described above are only schematic.
- the division of the unit is only a logical function division.
- multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not implemented.
- the displayed or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, or may be an electrical, mechanical or other form of connection.
- the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions in the embodiments of the present application.
- each functional unit in each embodiment of the present application may be integrated into one processing unit, or each of the units may exist separately physically, or two or more units may be integrated into one unit.
- the above integrated unit may be implemented in the form of hardware or in the form of software functional unit.
- the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium.
- the technical solution of this application is essentially a part that contributes to the existing technology, or all or part of the technical solution may be embodied in the form of a software product, which is stored in a storage medium. Included are instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiments of the present application.
- the aforementioned storage media include: U disks, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks or optical disks, and other media that can store program codes .
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Abstract
本申请提供了一种上报信道状态信息的方法和装置,该方法包括:终端设备获得第一指示信息,并将该第一指示信息发送给网络设备,网络设备接收该第一指示信息;该第一指示信息用于指示第一天线端口集合的信道状态信息与第二天线端口集合的信道状态信息之间的差分值,其中,该第一天线端口集合包括该终端设备的x个天线端口,该第二天线端口集合包括该终端设备的m个天线端口,该第一天线端口集合和该第二天线端口集合不同。本申请实施例的上报信道状态信息的方法和装置,有利于提高网络设备所获取的信道状态信息的准确性,从而提高数据传输性能。本实施例提供的方法可以引用于通信***,例如V2X、LTE-V、V2V、车联网、MTC、loT、LTE-M,M2M,物联网等。
Description
本申请涉及通信领域,特别涉及通信领域中的上报信道状态信息的方法和装置。
长期演进(long term evolution,LTE)和下一代无线***广泛采用了多输入多输出(multiple input and multiple output,MIMO)技术。如果网络设备可以获得全部或者部分下行信道信息,可以采用预编码(precoding)技术来提高信号传输质量或者速率。
在频分双工(frequency division duplexing,FDD)***中,预编码矩阵的信息靠终端设备进行反馈。终端设备通过测量信道状态信息参考信号(channel state information reference signal,CSI-RS)获得下行信道状态信息,并将预编码矩阵的信息以预编码矩阵指示(precoding matrix index,PMI)的形式反馈给网络设备。在时分双工(time division duplexing,TDD)***下,由于上行和下行使用相同的频率,因此,网络设备可以利用信道互易性获取下行信道状态信息。例如,终端设备发送探测参考信号(sounding reference signal,SRS),网络设备通过测量上行信道即可获得下行信道,从而得到预编码矩阵。
但是,受限于成本等因素,很多终端设备的发送天线端口数小于接收天线端口数。例如,终端设备具有1个发送天线端口,但是具有2个接收天线端口。该终端设备通过1个发送天线端口发送SRS后,网络设备仅可获得该发送天线端口对应的上行信道(也是下行信道)H
1,无法获取另外一个接收天线端口对应的下行信道H
2。则当网络设备需要给该终端设备同时传输2层数据流时,就无法获得两层数据流的准确的预编码矩阵,从而造成下行数据传输性能受损。
为了解决TDD***下仅靠SRS无法使网络设备获取完整的下行信道矩阵的问题,可以采用如下流程:终端设备通过x个发送天线端口发送SRS,使网络设备获得x个发送天线端口的信道;该终端设备测量网络设备发送的CSI-RS,获取y个接收天线端口的信道信息,并反馈PMI,该PMI指示该终端设备的y-x个非发送天线端口中m个非发送天线端口对应的信道矩阵的信息;网络设备通过PMI指示的m个发送天线端口的信道矩阵信息,确定对应的信道矩阵的信息,并结合该网络设备自身通过SRS测量获得的x个天线端口的信道矩阵的信息,重构完整的下行信道矩阵。
但是,由于网络设备和终端设备的射频器件不同,导致网络设备根据SRS测量的信道和终端设备根据CSI-RS测量所反馈的信道的功率增益不同,通过上述方式获得的下行信道状态信息不够准确。
发明内容
本申请提供一种上报信道状态信息的方法和装置,有利于提高网络设备所获取的信道状态信息的准确性,从而提高数据传输性能。
第一方面,提供了一种上报信道状态信息的方法,包括:终端设备获得第一指示信息,该第一指示信息用于指示第一天线端口集合的信道状态信息与第二天线端口集合的信道状态信息之间的差分值,其中,该第一天线端口集合包括该终端设备的x个天线端口,该第二天线端口集合包括该终端设备的m个天线端口,该第一天线端口集合和该第二天线端口集合不同,x和m是正整数;该终端设备发送该第一指示信息。
本申请实施例的上报信道状态信息的方法,通过终端设备上报两部分天线端口之间的信道状态信息的差分值,使得网络设备能够根据该差分值消除网络设备和终端设备的发送功率不同的影响,有利于提高网络设备所获取的信道状态信息的准确性,从而提高数据传输性能。
应理解,在本申请实施例中,A与B的差分值(differential value),可以是线性域的A和B的差分值,也可以是变换域(例如,dB域)的A和B的差分值。以线性域差值为例,A与B的差分值,可以是A-B,或者B-A,或者A/B,或者B/A。以dB域差值为例,A与B的差分值,可以是A(dB)-B(dB),或者B(dB)-A(dB),或者A(dB)/B(dB),或B(dB)/A(dB)。其中,X(dB)表示X变换到dB之后的取值。具体地,由线性域变换到dB域的定义可以是:X(dB)=20log
a(X)或X(dB)=10log
a(X),a为自然数,X为线性域的取值。但本实施例对其他变换域并不排除。
结合第一方面,在第一方面的某些实现方式中,该方法还包括下列步骤中的至少一个:该终端设备接收第一参考信号,该第一参考信号用于获得该第一指示信息;该终端设备发送该第二天线端口集合的信道状态信息;该终端设备通过该第一天线端口集合发送第二参考信号。
可选地,第一参考信号用于确定第二天线端口集合的信道状态信息和第一天线端口集合的信道状态信息,从而进一步获得上述第一指示信息。
应理解,终端设备接收第一参考信号可以指该终端设备通过第二天线端口集合的全部或部分天线端口以及第一天线端口集合的全部或部分天线端口接收第一参考信号。
具体地,终端设备根据测量第一参考信号反馈的信道状态信息对应的天线端口组成的集合为第一天线端口集合;终端设备发送第二参考信号的全部或部分天线端口组成的集合为第二天线端口集合。也就是说,在本申请实施例中,网络设备获取第一天线端口集合的信道状态信息的方式和获取第二天线端口集合的信道状态信息的方式是不同的。其中,可选地,上述第一天线端口集合和第二天线端口集合可以是有交集的,即两个集合中存在部分天线端口相同。此时,对于这部分相同的天线端口的信道状态信息,网络设备可以通过上面两种方式获得,最终采用哪种方式获得信道状态信息可以由网络设备根据情况决定。可选地,上述第一天线端口集合和第二天线端口集合的交集也可以为空,本申请实施例对此不作限定。
举例而言,终端设备有4个天线端口,分别为端口1、端口2、端口3和端口4,并且具有2个功率放大器(power amplifier,PA)。不失一般性的,端口的编号也可以从0开始,本申请实施例对此不作约束。
若该终端设备不支持天线选择功能,PA连接端口1和端口2。在一种可能的实现方式中,第一天线端口集合是由端口1和端口2组成的,第二天线端口集合是由端口3和端口4组成的。此时,第一天线端口集合和第二天线端口集合的交集为空集。网络设备 通过第二参考信号可以获得端口1和端口2的信道状态,通过该终端设备的反馈可以获得端口3和端口4的信道状态。在另一种可能的实现方式中,第二天线端口集合可以是由端口3和端口4中的一个端口组成的,第一天线端口集合是由端口1和端口2组成的。此时,第一天线端口集合和第二天线端口集合的交集为空集。这是由于网络设备可以决定每个终端设备的调度数据层数,若该网络设备确定了当前只会针对该终端设备最多调度3层数据(假设对应端口1、端口2和端口3),则通过第二参考信号获得了端口1和端口2的信道状态后,可以只需要获得另外一个端口(即端口3)的信道状态信息。这种方式有可能会带来一定的性能损失,但是可以降低上报开销。
在另一种可能的实现方式中,第一天线端口集合是由端口1和端口2组成的,第二天线端口集合是由端口1、端口3和端口4组成的。此时,第一天线端口集合和第二天线端口集合有交集,但是两者不同。在这种情况下,网络设备可以通过第二参考信号获得端口1的信道状态,但是网络设备判断端口1的信道的信噪比(signal noise ratio,SNR)太低,所以通过测量第二参考信号获得的端口1的信道状态不准确,可以让终端设备通过测量第一参考信号将端口1的信道状态信息也报上来,从而重构更准确的信道。
若该终端设备支持天线选择功能,PA通过开关切换可以在一个时刻连接端口1和端口2,在另外一个时刻连接端口3和端口4。在一种可能的实现方式中,第一天线端口集合是由端口1、端口2、端口3和端口4共同组成的,第二天线端口集合是由端口3和端口4组成的。此时,第一天线端口集合和第二天线端口集合的交集不为空集,但是两者不同。一个应用场景为:终端设备在时刻n
1+T,n
1+2T….上周期性地使用端口1和端口2发送第二参考信号,在时刻n
2+T,n
2+2T上周期性地使用端口3和端口4发送第二参考信号。在某个n
3时刻,网络设备决定触发终端设备上报CSI。此时,假设离n
3时刻最近的一次第二参考信号是终端设备通过端口1和端口2发送的,故端口1和端口2的信道状态信息还可以使用,而端口3和端口4的信道状态信息太陈旧不能使用了。因此,网络设备可以触发终端设备上报端口3和端口4对应的信道状态信息,从而可以提高重构信道的准确程度。
在上述应用场景中,也可以定义第二天线端口集合可以是由端口3和端口4组成的,第一天线端口集合是由端口1和端口2组成的。在这种定义方式下,网络设备通过终端设备的反馈获得信道状态信息的端口组成第二天线端口集合,仅通过测量第二参考信号获得信道状态信息的端口组成第一天线端口集合。此时,第一天线端口集合和第二天线端口集合的交集为空集。
应理解,本申请对第二天线端口集合和第一天线端口集合的具体定义不作限定,只约束两者不同。
结合第一方面,在第一方面的某些实现方式中,该第一指示信息为宽带参数,或该第一指示信息为子带参数。
具体地,如果上述第一指示信息为宽带参数,那么针对CSI整个上报带宽,终端设备只需要上报一个第一指示信息。如果第一指示信息为子带参数,那么针对CSI上报带宽中的每个子带,终端设备都需要上报一个第一指示信息。
结合第一方面,在第一方面的某些实现方式中,该第一天线端口集合的信道状态信息包括与该第一天线端口集合的信道矩阵G
u相关联的第一幅度信息;和/或
该第二天线端口集合的信道状态信息包括与该第二天线端口集合的信道矩阵G
d相关联的第二幅度信息;
其中,G
d是m行M列的矩阵,G
u是x行M列的矩阵,M是正整数。
具体的,本文中,第一天线端口集合的信道矩阵G
u指的是第一天线端口集合中的全部或部分的天线端口对应的信道向量组成的矩阵。具体的形式可以是:设第一天线端口集合中的第i个端口对应的信道向量表示为G
u,i,则G
u,i=[g
u,i,1 g
u,i,2 ... g
u,i,M]∈C
1×M,其中,g
u,i,j表示网络设备的第j个天线端口与上述第i个天线端口之间的信道系数,为复数。则以全部天线端口为例,第一天线端口集合中的全部天线端口对应的信道向量组成的矩阵表示为
x表示第一天线端口集合包括的端口个数,M为网络设备的发送第一参考信号的端口数。第一天线端口集合中的部分天线端口对应的信道向量组成的矩阵G
u的表达形式是类似的,此时,G
u的行数为部分天线端口中天线端口的个数。
类似的,第二天线端口集合的信道矩阵G
d是第二天线端口集合中的全部或部分端口对应的信道向量组成的矩阵。具体的形式可以是:设第二天线端口集合中的第i个端口对应的信道向量表示为G
d,i,则G
d,i=[g
d,i,1 g
d,i,2 ... g
d,i,M],其中,g
d,i,j表示网络设备的第j个天线端口与上述第i个天线端口之间的信道系数,为复数。则以全部端口为例,第二天线端口集合中的全部天线端口对应的信道向量组成的矩阵表示为
m表示第二天线端口集合包括的端口个数,M为网络设备的发送第一参考信号的端口数。第二天线端口集合中的部分天线端口对应的信道向量组成的矩阵G
d的表达形式是类似的,此时,G
d的行数为部分天线端口中天线端口的个数。
具体地,上述与G
u相关联的第一幅度信息可以是根据第一天线端口集合的信道矩阵G
u中某个元素的幅度信息确定的,也可以是根据对G
u中的全部或部分元素经过某种处理获得的一个幅度信息确定的;上述与G
d相关联的第二幅度信息可以是根据第二天线端口集合的信道矩阵G
d中某个元素的幅度信息确定的,也可以是根据对G
d中的全部或部分元素经过某种处理获得的一个幅度信息确定的,本申请实施例对此不作限定。应理解,上述第一幅度信息可以是子带幅度信息,也可以是宽带幅度信息,上述第二幅度信息可以是子带幅度信息,也可以是宽带幅度信息,本申请实施例对此不作限定。
以与G
u相关联的第一幅度信息为例,该第一幅度信息可以是幅度的函数,例如,该第一幅度信息可以是幅度本身,也可以是功率,还可以是幅度或功率变换到其他域(例如dB域)之后的取值,还可以是幅度或功率或其变换到dB域之后经过某种处理(例如归一化或量化)之后的取值,本申请实施例对此不作限定。
可选地,第一幅度信息可以是G
u中某个元素的幅度信息的函数。可选地,上述第一幅度信息可以是对G
u中的全部或部分元素的幅度信息的函数。
第二天线端口集合的信道状态信息与上述第一天线端口集合的信道状态信息类似,此处不再赘述。
在本申请实施例中,第一指示信息可以为宽带参数,也可以为子带参数。
若第一指示信息为宽带参数,那么第一幅度信息和第二幅度信息就是宽带幅度信息。在一种可能的实现方式中,在每个子带上,第二天线端口集合的信道矩阵G
d的(全部或部分)元素或者G
d对应的矩阵W
2,d的(全部或部分)元素的幅度由宽带幅度和子带差分幅度联合表示,则终端设备在上报G
d时,可以将上述全部或部分元素的宽带幅度以第一幅度信息为基准做归一化处理,将子带差分幅度正常上报。在另一种可能的实现方式中,在每个子带上,G
d的全部或部分元素或者W
2,d的全部或部分元素的幅度直接以子带幅度表示,不拆分为宽带幅度加子带差分幅度的形式,则终端设备在上报G
d时,可以将上述全部或部分元素的子带幅度以第一幅度信息为基准做归一化。对应的,网络设备对第一天线端口集合的信道矩阵G
u的操作与终端设备对G
d的操作类似,此处不再赘述。
若第一指示信息为子带参数,那么第一幅度信息和第二幅度信息就是子带幅度信息。在一种可能的实现方式中,在每个子带上,G
d的(全部或部分)元素或者W
2,d的(全部或部分)元素的幅度直接以子带幅度表示,不拆分为宽带幅度加子带差分幅度的形式,则终端设备在上报G
d时,可以将上述元素的子带幅度以第一幅度信息的子带幅度为基准做归一化。对应的,网络设备对第一天线端口集合的信道矩阵G
u的操作与终端设备对G
d的操作类似,此处不再赘述。
在一种可能的实现方式中,上述信道状态信息为功率信息,后者功率信息的dB域取值,功率是幅度的平方,因此可以也理解为上述信道状态信息是幅度的函数。
结合第一方面,在第一方面的某些实现方式中,该第一幅度信息是根据下列任意一种元素确定的:G
u的至少一行元素中幅度信息取值最大的元素、G
u对应的矩阵W
2,u中至少一列元素中幅度信息取值最大的元素、G
u的至少一个奇异值中幅度信息取值最大的奇异值、G
u的至少一个特征值中幅度信息取值最大的特征值;和/或
该第二幅度信息是根据下列任意一种元素确定的:G
d的至少一行元素中幅度信息取值最大的元素、G
d对应的矩阵W
2,d中至少一列元素中幅度信息取值最大的元素、G
d的至少一个特征值中幅度信息取值最大的特征值、G
d的至少一个奇异值中幅度信息取值最大的奇异值;
其中,G
u
T(l
u)=W
1×W
2,u(l
u),G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m}。
结合第一方面,在第一方面的某些实现方式中,该第一幅度信息是根据G
u的至少一行元素中幅度信息取值最大的元素确定的,该第二幅度信息是根据G
d的至少一行元素中幅度信息取值最大的元素确定的。
结合第一方面,在第一方面的某些实现方式中,该第一幅度信息是根据G
u对应的矩阵W
2,u中至少一列元素中幅度信息取值最大的元素确定的,该第二幅度信息是根据G
d对应的矩阵W
2,d中至少一列元素中幅度信息取值最大的元素确定的,其中,G
u
T(l
u)=W
1×W
2,u(l
u),G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m}。
在本申请实施例中,上述的W
1为块对角阵,
A=[b
1,b
2,…b
L]由L个 基向量构成,N=2L。具体的,W
1是宽带参数,W
2,u、W
2,d包括宽带参数(例如宽带幅度)和子带参数(例如子带差分幅度和子带相位),或者,W
2,u、W
2,d包括子带参数(例如子带幅度和子带相位)。终端设备可以通过反馈W
1的参数的索引和W
2的参数的索引来表示G
u和G
d。
结合第一方面,在第一方面的某些实现方式中,该第一幅度信息是根据G
u的至少一行元素中幅度信息取值最大的元素确定的,该第二幅度信息是根据G
d对应的矩阵W
2,d中至少一列元素中幅度信息取值最大的元素确定的,其中,G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,d为N*m的矩阵,N是正整数,l
d∈{1,2,...,m}。
本实施例直接根据信道矩阵G
u确定第一幅度信息,可以避免终端设备对G
u进行双码本结构的分解,网络设备在重构完整信道状态矩阵的时候也无需对上行信道矩阵进行双码本结构的分解,能够在获得准确信道状态信息的同时,降低网络设备和终端设备的复杂度。
结合第一方面,在第一方面的某些实现方式中,该第一幅度信息是根据G
u的至少一个奇异值中幅度信息取值最大的奇异值确定的,该第二幅度信息是根据G
d的至少一个奇异值中幅度信息取值最大的奇异值确定的。
结合第一方面,在第一方面的某些实现方式中,该第一幅度信息是根据G
u的至少一个特征值中幅度信息取值最大的特征值确定的,该第二幅度信息是根据G
d的至少一个特征值中幅度信息取值最大的特征值确定的。
结合第一方面,在第一方面的某些实现方式中,该第一幅度信息为第一元素的幅度信息,该第一元素为G
u中的元素、G
u对应的矩阵W
2,u中的元素、G
u的奇异值或G
u的特征值;和/或
该第二幅度信息为第二元素的幅度信息,该第二元素为G
d中的元素、G
d对应的矩阵W
2,d中的元素、G
d的奇异值或G
d的特征值。
结合第一方面,在第一方面的某些实现方式中,该第一幅度信息是根据G
u的至少一行元素中幅度信息取值最大的元素确定的,或该第一幅度信息为第一元素的幅度信息,该第一元素的索引为预定义的;
该第二幅度信息包括n个子元素,该n个子元素中的第i个子元素是根据G
d的n行中第i行的M个元素中幅度信息最大的元素确定的,n为正整数,i∈{1,2,...,n}。
结合第一方面,在第一方面的某些实现方式中,该第一幅度信息是根据G
u对应的矩阵W
2,u的至少一列元素中幅度信息取值最大的元素确定的,或该第一幅度信息为第一元素的幅度信息,该第一元素的索引为预定义的;
该第二幅度信息包括n个子元素,该n个子元素中的第i个子元素是根据G
d对应的矩阵W
2,d的n列中第i列的N个元素中幅度信息最大的元素确定的,n为正整数,i∈{1,2,...,n};
其中,G
u
T(l
u)=W
1×W
2,u(l
u),G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m}。
在一种可能的实现方式中,上述n大于或等于2。
结合第一方面,在第一方面的某些实现方式中,该G
d的至少一行包括n行,n为正 整数,该方法还包括:
该终端设备发送第二指示信息,该第二指示信息用于指示n个第三元素中除了第二元素之外,其余的n-1个第三元素的幅度信息与该第二元素的幅度信息的差分值,其中,该n个第三元素中的第i个第三元素是根据该n行中第i行的M个元素中幅度信息最大的元素确定的,该第二幅度信息是根据该第二元素的幅度信息确定的。
结合第一方面,在第一方面的某些实现方式中,该矩阵W
2,d中的至少一列包括n列,n为正整数,该方法还包括:
该终端设备发送第三指示信息,该第三指示信息用于指示n个第四元素中除了第二元素之外,其余的n-1个第四元素的幅度信息与该第二元素的幅度信息的差分值,其中,该n个第四元素中的第i个第四元素是根据该n列中第i列的N个元素中幅度信息最大的元素确定的,该第二幅度信息是根据该第二元素的幅度信息确定的。
结合第一方面,在第一方面的某些实现方式中,该方法还包括:该终端设备发送第四指示信息,该第四指示信息用于指示该第一元素的索引和/或该第二元素的索引。
结合第一方面,在第一方面的某些实现方式中,该第一元素的索引为预定义的;和/或该第二元素的索引为预定义的。
结合第一方面,在第一方面的某些实现方式中,该第一幅度信息是根据G
u的至少两个元素的幅度信息确定的,或,该第一幅度信息是根据G
u对应的矩阵W
2,u的至少两个元素的幅度信息确定的;和/或,
该第二幅度信息是根据G
d的至少两个元素的幅度信息确定的;或,该第二幅度信息是根据G
d对应的矩阵W
2,d的至少两个元素的幅度信息确定的;
其中,G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,d为N*m的矩阵,N是正整数,l
d∈{1,2,...,m}。
具体地,上述根据至少两个元素的幅度信息确定的可以是根据至少两个元素的幅度信息的函数确定的。可选地,上述函数可以是至少两个元素的幅度信息的加权求和,也可以是加权求和变换到其它域(如dB域),也可以是至少两个元素的幅度信息的加权平均值,或加权平均值变换到其它域(如dB域)。
结合第一方面,在第一方面的某些实现方式中,该第一幅度信息是根据G
u的至少两个元素的幅度信息的平均值确定的,该第二幅度信息是根据G
d的至少两个元素的幅度信息的平均值确定的;或
该第一幅度信息是根据G
u对应的矩阵W
2,u的至少两个元素的幅度信息的平均值确定的,该第二幅度信息是根据G
d对应的矩阵W
2,d的至少两个元素的幅度信息的平均值确定的。
进一步,至少两个元素幅度信息的加权平均值,可以是宽带幅度信息的加权平均值或子带幅度信息的加权平均值。上述根据平均值确定的,可以包括平均值本身,也可以包括根据平均值的函数确定的,例如,根据至少两个元素的幅度信息的求和值,其中,求和值是平均值的倍数,本申请实施例对此不作限定。
应理解,本申请实施例所提到的平均值可以是算数平均值,也可以是几何平均值、均方根平均值、或加权平均值,本申请实施例对此不作限定。
结合第一方面,在第一方面的某些实现方式中,该第一幅度信息是根据G
u的至少两 个元素的幅度信息的求和确定的,该第二幅度信息是根据G
d的至少两个元素的幅度信息的求和确定的;或
该第一幅度信息是根据G
u对应的矩阵W
2,u的至少两个元素的幅度信息的求和确定的,该第二幅度信息是根据G
d对应的矩阵W
2,d的至少两个元素的幅度信息的求和确定的。
进一步,至少两个元素幅度信息的加权求和,可以是宽带幅度信息的加权求和或子带幅度信息的加权求和。上述根据求和确定的,可以包括幅度信息求和值本身,也可以包括根据求和值的函数确定的,本申请实施例对此不作限定。
结合第一方面,在第一方面的某些实现方式中,该第一幅度信息是根据矩阵G′
u的范数信息确定的,该第二幅度信息是根据矩阵G′
d的范数信息确定的;或
该第一幅度信息是根据矩阵G′
u对应的矩阵W
2,u的范数信息确定的,该第二幅度信息是根据G′
u对应的矩阵W
2,d的范数信息确定的,其中,
X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m},其中,G′
u包括G
u的至少两个元素,G′
d包括G
d的至少两个元素。
应理解,矩阵G′
u的范数信息可以是G′
u的子带p范数的函数,也可以是G′
u的宽带p范数的函数,还可以是子带p范数的平均值的函数,函数的可能形式与前述类似,本申请实施例对此不作限定,其中p是自然数。G′
d、W
2,d与W
2,u的范数信息与G′
u的范数信息类似。
结合第一方面,在第一方面的某些实现方式中,该第一天线端口集合为预定义的、该终端设备根据网络设备的配置确定的、或根据该终端设备上报的终端能力确定的;和/或
该第二天线端口集合为预定义的、该终端设备根据网络设备的配置确定的、或根据该终端设备上报的终端能力确定的。
在一种可能的实现方式中,第一天线端口集合和第二天线端口集合可以是预定义的,例如,可以预定义距网络设备触发终端设备上报信道状态信息的时刻最近的k次发送第二参考信号的天线端口为组成一天线端口集合,终端设备的y个天线端口中的剩余其他天线端口为第二天线端口集合,k为正整数。
在另一种可能的实现方式中,第一天线端口集合和第二天线端口集合可以是根据网络设备的配置确定的。例如,网络设备可以通过配置信息指示终端设备上报信道状态信息的天线端口是哪几个,则这几个天线端口为第二天线端口集合,终端设备的y个天线端口中剩余的其他天线端口即组成第一天线端口集合。又例如,网络设备可以指示终端设备上报的信道状态信息不针对哪几个天线端口,则这几个天线端口组成第一天线端口集合,其他天线端口组成第二天线端口集合。应理解,具体的指示方式可以是直接指示,也可以是间接指示,本申请实施例对此不作限定。若采用直接指示,网络设备可以指示天线端口的端口号,若采用间接指示,网络设备可以指示天线端口的端口个数。
在另一种可能的实现方式中,第一天线端口集合和第二天线端口集合可以是根据终端能力确定的,该终端能力可以由终端设备上报给网络设备。例如,终端设备上报自己为2发4收(2T4R),则第一天线端口集合为4个天线端口中的2个天线端口,第二天线端口集合为4个天线端口中除上述2个天线端口的另外2个天线端口。
结合第一方面,在第一方面的某些实现方式中,该第一天线端口集合和/或该第二天线端口集合是该终端设备通过该网络设备发送的以下信令中的至少一个中所携带的配置信息确定的:无线资源控制RRC、多址接入控制MAC控制元素CE和下行控制信息DCI。
具体地,网络设备可以通过RRC、DCI以及MAC CE中的至少一个信令向终端设备配置上述第一天线端口集合和/或第二天线端口集合。下面分几种情况进行详细介绍,但应理解,下面的情况仅仅作为示例,对本申请实施例的保护范围不构成任何影响。
1)RRC:网络设备可以通过RRC信令指示信道状态信息上报的配置信息,该配置信息可以直接用于确定第一天线端口集合和/或第二天线端口集合。终端设备接收该配置信息,根据该配置信息即可确定第一天线端口集合和/或第二天线端口集合。可选地,该信道状态信息上报是周期的。
2)RRC+DCI:网络设备可以通过RRC信令指示信道状态信息上报的配置信息,该配置信息可以用于确定第一天线端口集合和/或第二天线端口集合。网络设备通过DCI触发终端设备上报信道状态信息。可选地,该信道状态信息上报是非周期或半持续(semi-persistent)的。
3)RRC+DCI:终端设备为2T4R,并且支持天线选择。网络设备可以通过RRC信令指示信道状态信息上报的配置信息,该配置信息可以确定第二天线端口集合包括终端设备的4个天线端口中的全部天线端口。由于每次只有2个天线端口发送第二参考信号,因此,网络设备可以通过DCI选择本次上报不针对或针对的天线端口是4个天线端口中的哪两个天线端口。例如,4个端口的编号分别为0、1、2、3,网络设备可通过DCI选择本次上报针对的端口为端口1和端口2,从而终端设备确定本次的第一天线端口集合包括端口1和端口2,第二天线端口集合包括端口3和端口4。
在本申请实施例中,通过RRC配置一个较大的集合,DCI选择该集合中的子集作为第一天线端口集合,实现更加灵活,可以降低RRC配置的信道状态信息上报的个数。例如,如果终端设备的4个天线端口中有两个天线端口的信道SNR较低,这两个天线端口的SRS测量会很不准确,导致下行数据的预编码不准确。通过DCI触发这两个天线端口的信道状态的反馈,可以提高这两个端口信道信息的准确程度。
4)RRC+MAC CE+DCI:网络设备可以通过RRC发送配置信息,用于指示多个可能的天线端口集合,再通过MAC CE从多个可能的天线端口集合中选择一部分天线端口集合作为备选集合,最后通过DCI从备选集合中选择一个天线端口集合作为本次上报对应的第一天线端口集合和/或第二天线端口集合。
结合第一方面,在第一方面的某些实现方式中,该第一参考信号为信道状态信息参考信号CSI-RS;和/或该第二参考信号为探测参考信号SRS。
第二方面,提供了一种上报信道状态信息的方法,包括:网络设备发送第一参考信号;网络设备接收终端设备根据所述第一参考信号获得的第一指示信息,所述第一指示信息用于指示第一天线端口集合的信道状态信息与第二天线端口集合的信道状态信息之间的差分值,其中,所述第一天线端口集合包括所述终端设备的x个天线端口,所述第二天线端口集合包括所述终端设备的m个天线端口,所述第一天线端口集合和所述第二天线端口集合不同,x和m是正整数。
结合第二方面,在第二方面的某些实现方式中,所述方法还包括下列步骤中的至少一 个:所述网络设备接收所述第二天线端口集合的信道状态信息;所述网络设备接收第二参考信号。
结合第二方面,在第二方面的某些实现方式中,所述第一指示信息为宽带参数,或所述第一指示信息为子带参数。
结合第二方面,在第二方面的某些实现方式中,所述第一天线端口集合的信道状态信息包括与所述第一天线端口集合的信道矩阵G
u相关联的第一幅度信息;和/或
所述第二天线端口集合的信道状态信息包括与所述第二天线端口集合的信道矩阵G
d相关联的第二幅度信息;
其中,所述G
d是m行M列的矩阵,所述G
u是x行M列的矩阵,M是正整数。
结合第二方面,在第二方面的某些实现方式中,所述第一幅度信息是根据下列任意一种元素确定的:G
u的至少一行元素中幅度信息取值最大的元素、G
u对应的矩阵W
2,u中至少一列元素中幅度信息取值最大的元素、G
u的至少一个奇异值中幅度信息取值最大的奇异值、G
u的至少一个特征值中幅度信息取值最大的特征值;和/或
所述第二幅度信息是根据下列任意一种元素确定的:G
d的至少一行元素中幅度信息取值最大的元素、G
d对应的矩阵W
2,d中至少一列元素中幅度信息取值最大的元素、G
d的至少一个特征值中幅度信息取值最大的特征值、G
d的至少一个奇异值中幅度信息取值最大的奇异值;
其中,G
u
T(l
u)=W
1×W
2,u(l
u),G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m}。
结合第二方面,在第二方面的某些实现方式中,所述第一幅度信息是根据G
u的至少一行元素中幅度信息取值最大的元素确定的,所述第二幅度信息是根据G
d的至少一行元素中幅度信息取值最大的元素确定的。
结合第二方面,在第二方面的某些实现方式中,所述第一幅度信息是根据G
u对应的矩阵W
2,u中至少一列元素中幅度信息取值最大的元素确定的,所述第二幅度信息是根据G
d对应的矩阵W
2,d中至少一列元素中幅度信息取值最大的元素确定的,其中,G
u
T(l
u)=W
1×W
2,u(l
u),G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m}。
结合第二方面,在第二方面的某些实现方式中,所述第一幅度信息是根据G
u的至少一行元素中幅度信息取值最大的元素确定的,所述第二幅度信息是根据G
d对应的矩阵W
2,d中至少一列元素中幅度信息取值最大的元素确定的,其中,G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,d为N*m的矩阵,N是正整数,l
d∈{1,2,...,m}。
结合第二方面,在第二方面的某些实现方式中,所述第一幅度信息是根据G
u的至少一个奇异值中幅度信息取值最大的奇异值确定的,所述第二元素是根据G
d的至少一个奇异值中幅度信息取值最大的奇异值确定的。
结合第二方面,在第二方面的某些实现方式中,所述第一幅度信息是根据G
u的至少 一个特征值中幅度信息取值最大的特征值确定的,所述第二元素是根据G
d的至少一个特征值中幅度信息取值最大的特征值确定的。
结合第二方面,在第二方面的某些实现方式中,所述第一幅度信息为第一元素,所述第一元素为G
u中的元素、G
u对应的矩阵W
2,u中的元素、G
u的奇异值或G
u的特征值;和/或
所述第二幅度信息为第二元素,所述第二元素为G
d中的元素、G
d对应的矩阵W
2,d中的元素、G
d的奇异值或G
d的特征值。
结合第二方面,在第二方面的某些实现方式中,所述第一幅度信息是根据G
u的至少一行元素中幅度信息取值最大的元素确定的,或所述第一幅度信息为第一元素,所述第一元素的索引为预定义的;
所述第二幅度信息包括n个子元素,所述n个子元素中的第i个子元素是根据G
d的n行中第i行的M个元素中幅度信息最大的元素确定的,n为正整数,i∈{1,2,...,n}。
结合第二方面,在第二方面的某些实现方式中,所述第一幅度信息是根据G
u对应的矩阵W
2,u的至少一列元素中幅度信息取值最大的元素确定的,或所述第一幅度信息为第一元素,所述第一元素的索引为预定义的;
所述第二幅度信息包括n个子元素,所述n个子元素中的第i个子元素是根据G
d对应的矩阵W
2,d的n列中第i列的N个元素中幅度信息最大的元素确定的,n为正整数,i∈{1,2,...,n};
其中,G
u
T(l
u)=W
1×W
2,u(l
u),G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m}。
结合第二方面,在第二方面的某些实现方式中,所述G
d的至少一行包括n行,n为正整数,所述方法还包括:
所述网络设备接收第二指示信息,所述第二指示信息用于指示n个第三元素中除了所述第二元素之外,其余的n-1个第三元素的幅度信息与所述第二元素的幅度信息的差分值,其中,所述n个第三元素中的第i个第三元素是根据所述n行中第i行的M个元素中幅度信息最大的元素确定的,所述第二幅度信息是根据所述第二元素的幅度信息确定的。
结合第二方面,在第二方面的某些实现方式中,所述矩阵W
2,d中的至少一列包括n列,n为正整数,所述方法还包括:
所述网络设备接收第三指示信息,所述第三指示信息用于指示n个第四元素中除了所述第二元素之外,其余的n-1个第四元素的幅度信息与所述第二元素的幅度信息的差分值,其中,所述n个第四元素中的第i个第四元素是根据所述n列中第i列的N个元素中幅度信息最大的元素确定的,所述第二幅度信息是根据所述第二元素的幅度信息确定的。
结合第二方面,在第二方面的某些实现方式中,所述方法还包括:所述网络设备接收第四指示信息,所述第四指示信息用于指示所述第一元素的索引和/或所述第二元素的索引。
结合第二方面,在第二方面的某些实现方式中,所述第一元素的索引为预定义的;和/或所述第二元素的索引为预定义的。
结合第二方面,在第二方面的某些实现方式中,所述第一幅度信息是根据G
u的至少 两个元素的幅度信息确定的,所述第二幅度信息是根据G
d的至少两个元素的幅度信息确定的;或
所述第一幅度信息是根据G
u对应的矩阵W
2,u的至少两个元素的幅度信息确定的,所述第二幅度信息是根据G
d对应的矩阵W
2,d的至少两个元素的幅度信息确定的,其中,G
u
T(l
u)=W
1×W
2,u(l
u),G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m}。
结合第二方面,在第二方面的某些实现方式中,所述第一幅度信息是根据G
u的至少两个元素的幅度信息的平均值确定的,所述第二幅度信息是根据G
d的至少两个元素的幅度信息的平均值确定的;或
所述第一幅度信息是根据G
u对应的矩阵W
2,u的至少两个元素的幅度信息的平均值确定的,所述第二幅度信息是根据G
d对应的矩阵W
2,d的至少两个元素的幅度信息的平均值确定的。
结合第二方面,在第二方面的某些实现方式中,所述第一幅度信息是根据G
u的至少两个元素的幅度信息的求和确定的,所述第二幅度信息是根据G
d的至少两个元素的幅度信息的求和确定的;或
所述第一幅度信息是根据G
u对应的矩阵W
2,u的至少两个元素的幅度信息的求和确定的,所述第二幅度信息是根据G
d对应的矩阵W
2,d的至少两个元素的幅度信息的求和确定的。
结合第二方面,在第二方面的某些实现方式中,所述第一幅度信息是根据矩阵G′
u的范数信息确定的,所述第二幅度信息是根据矩阵G′
d的范数信息确定的;或
所述第一幅度信息是根据矩阵G′
u对应的矩阵W
2,u的范数信息确定的,所述第二幅度信息是根据G′
u对应的矩阵W
2,d的范数信息确定的,其中,
X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m},其中,G′
u包括G
u的至少两个元素,G′
d包括G
d的至少两个元素。
结合第二方面,在第二方面的某些实现方式中,所述第一天线端口集合为预定义的、所述终端设备根据网络设备的配置确定的、或根据所述终端设备上报的终端能力确定的;和/或
所述第二天线端口集合为预定义的、所述终端设备根据网络设备的配置确定的、或根据所述终端设备上报的终端能力确定的。
结合第二方面,在第二方面的某些实现方式中,所述第一参考信号为信道状态信息参考信号CSI-RS;和/或所述第二参考信号为探测参考信号SRS。
第三方面,提供了一种上报信道状态信息的装置,用于执行第一方面或第一方面任意可能的实现方式中的方法。具体地,该装置包括用于执行上述第一方面或第一方面的任一种可能的实现方式中的方法的单元。
第四方面,提供了另一种上报信道状态信息的装置,用于执行第二方面或第二方面任意可能的实现方式中的方法。具体地,该装置包括用于执行上述第二方面或第二方面的任 一种可能的实现方式中的方法的单元。
第五方面,提供了另一种上报信道状态信息的装置,该装置包括:收发器、存储器和处理器。其中,该收发器、该存储器和该处理器通过内部连接通路互相通信,该存储器用于存储指令,该处理器用于执行该存储器存储的指令,以控制接收器接收信号,并控制发送器发送信号,并且当该处理器执行该存储器存储的指令时,使得该处理器执行第一方面或第一方面的任一种可能的实现方式中的方法。
第六方面,提供了另一种上报信道状态信息的装置,该装置包括:收发器、存储器和处理器。其中,该收发器、该存储器和该处理器通过内部连接通路互相通信,该存储器用于存储指令,该处理器用于执行该存储器存储的指令,以控制接收器接收信号,并控制发送器发送信号,并且当该处理器执行该存储器存储的指令时,使得该处理器执行第二方面或第二方面的任一种可能的实现方式中的方法。
第七方面,提供了一种上报信道状态信息的***,该***包括上述第三方面或第三方面的任一种可能实现方式中的装置以及第四方面或第四方面中的任一种可能实现方式中的装置;或者
该***包括上述第五方面或第五方面的任一种可能实现方式中的装置以及第六方面或第六方面中的任一种可能实现方式中的装置。
第八方面,提供了一种计算机程序产品,所述计算机程序产品包括:计算机程序代码,当所述计算机程序代码被计算机运行时,使得所述计算机执行上述各方面中的方法。
第九方面,提供了一种计算机可读介质,用于存储计算机程序,该计算机程序包括用于执行上述各方面中的方法的指令。
第十方面,提供一种芯片***,包括:输入接口、输出接口、至少一个处理器、存储器,所述输入接口、输出接口、所述处理器以及所述存储器之间通过内部连接通路相连,所述处理器用于执行所述存储器中的代码,当所述代码被执行时,所述处理器用于执行上述各方面中的方法。
图1示出了本申请实施例的通信***的示意图。
图2示出了根据本申请实施例的上报信道状态信息的方法的示意性流程图。
图3示出了根据本申请实施例的另一上报信道状态信息的方法的示意性流程图。
图4示出了根据本申请实施例的上报信道状态信息的装置的示意性框图。
图5示出了根据本申请实施例的另一上报信道状态信息的装置的示意性框图。
图6示出了根据本申请实施例的另一上报信道状态信息的装置的示意性框图。
图7示出了根据本申请实施例的另一上报信道状态信息的装置的示意性框图。
下面将结合附图,对本申请中的技术方案进行描述。
应理解,本申请实施例的技术方案可以应用于各种通信***,例如:全球移动通信(global system of mobile communication,GSM)***、码分多址(code division multiple access,CDMA)***、宽带码分多址(wideband code division multiple access,WCDMA) ***、通用分组无线业务(general packet radio service,GPRS)、长期演进(long term evolution,LTE)***、LTE频分双工(frequency division duplex,FDD)***、LTE时分双工(time division duplex,TDD)、通用移动通信***(universal mobile telecommunication system,UMTS)、全球互联微波接入(worldwide interoperability for microwave access,WiMAX)通信***、未来的第五代(5th generation,5G)***或新无线(new radio,NR)等。
还应理解,本申请实施例的技术方案还可以应用于各种基于非正交多址接入技术的通信***,例如稀疏码多址接入(sparse code multiple access,SCMA)***,当然SCMA在通信领域也可以被称为其他名称;进一步地,本申请实施例的技术方案可以应用于采用非正交多址接入技术的多载波传输***,例如采用非正交多址接入技术正交频分复用(orthogonal frequency division multiplexing,OFDM)、滤波器组多载波(filter bank multi-carrier,FBMC)、通用频分复用(generalized frequency division multiplexing,GFDM)、滤波正交频分复用(filtered-OFDM,F-OFDM)***等。
还应理解,在本申请实施例中,终端设备可以经无线接入网(radio access network,RAN)与一个或多个核心网进行通信,该终端设备可称为接入终端、用户设备(user equipment,UE)、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。接入终端可以是蜂窝电话、无绳电话、会话启动协议(session initiation protocol,SIP)电话、无线本地环路(wireless local loop,WLL)站、个人数字处理(personal digital assistant,PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备、未来5G网络中的终端设备或者未来演进的公共陆地移动网络(public land mobile network,PLMN)中的终端设备等。
还应理解,在本申请实施例中,网络设备可用于与终端设备通信,该网络设备可以是GSM***或CDMA***中的基站(base transceiver station,BTS),也可以是WCDMA***中的基站(node B,NB),还可以是LTE***中的演进型基站(evolutional node B,eNB或eNode B),或者该网络设备可以为中继站、接入点、车载设备、可穿戴设备、未来5G网络中的网络侧设备或者未来演进的PLMN网络中的网络设备等。
本申请实施例可以适用于LTE***以及后续的演进***如5G等,或其他采用各种无线接入技术的无线通信***,如采用码分多址,频分多址,时分多址,正交频分多址,单载波频分多址等接入技术的***,尤其适用于需要信道信息反馈和/或应用二级预编码技术的场景,例如应用Massive MIMO技术的无线网络、应用分布式天线技术的无线网络等。
应理解,多输入输出(multiple-input multiple-output,MIMO)技术是指在发送端设备和接收端设备分别使用多个发射天线和接收天线,使信号通过发送端设备与接收端设备的多个天线传送和接收,从而改善通信质量。它能充分利用空间资源,通过多个天线实现多发多收,在不增加频谱资源和天线发射功率的情况下,可以成倍地提高***信道容量。
MIMO可以分为单用户多输入多输出(single-user MIMO,SU-MIMO)和多用户多输入多输出(multi-user MIMO,MU-MIMO)。Massive MIMO基于多用户波束成形的原理,在发送端设备布置几百根天线,对几十个目标接收机调制各自的波束,通过空间信号隔离,在同一频率资源上同时传输几十条信号。因此,Massive MIMO技术能够充分利用大规模 天线配置带来的空间自由度,提升频谱效率。
图1是本申请实施例所用的通信***的示意图。如图1所示,该通信***100包括网络设备102,网络设备102可包括多个天线组。每个天线组可以包括一个或多个天线,例如,一个天线组可包括天线104和106,另一个天线组可包括天线108和110,附加组可包括天线112和114。图1中对于每个天线组示出了2个天线,然而可以对于每个组使用更多或更少的天线。网络设备102可附加地包括发射机链和接收机链,本领域普通技术人员可以理解,它们均可包括与信号发送和接收相关的多个部件,例如处理器、调制器、复用器、解调器、解复用器或天线等。
网络设备102可以与多个终端设备通信,例如,网络设备102可以与终端设备116和终端设备122通信。然而,可以理解,网络设备102可以与类似于终端设备116或122的任意数目的终端设备通信。终端设备116和122可以是例如蜂窝电话、智能电话、便携式电脑、手持通信设备、手持计算设备、卫星无线电装置、全球定位***、PDA和/或用于在无线通信***100上通信的任意其它适合设备。
如图1所示,终端设备116与天线112和114通信,其中天线112和114通过前向链路118向终端设备116发送信息,并通过反向链路120从终端设备116接收信息。此外,终端设备122与天线104和106通信,其中天线104和106通过前向链路124向终端设备122发送信息,并通过反向链路126从终端设备122接收信息。
例如,在频分双工FDD***中,例如,前向链路118可利用与反向链路120所使用的不同频带,前向链路124可利用与反向链路126所使用的不同频带。
再例如,在时分双工TDD***和全双工(full duplex)***中,前向链路118和反向链路120可使用共同频带,前向链路124和反向链路126可使用共同频带。
被设计用于通信的每组天线和/或区域称为网络设备102的扇区。例如,可将天线组设计为与网络设备102覆盖区域的扇区中的终端设备通信。在网络设备102通过前向链路118和124分别与终端设备116和122进行通信的过程中,网络设备102的发射天线可利用波束成形来改善前向链路118和124的信噪比。此外,与网络设备通过单个天线向它所有的终端设备发送信号的方式相比,在网络设备102利用波束成形向相关覆盖区域中随机分散的终端设备116和122发送信号时,相邻小区中的移动设备会受到较少的干扰。
在给定时间,网络设备102、终端设备116或终端设备122可以是无线通信发送装置和/或无线通信接收装置。当发送数据时,无线通信发送装置可对数据进行编码以用于传输。具体地,无线通信发送装置可获取要通过信道发送至无线通信接收装置的一定数目的数据比特,例如,无线通信发送装置可生成、从其它通信装置接收、或在存储器中保存等要通过信道发送至无线通信接收装置的一定数目的数据比特。这种数据比特可包含在数据的传输块或多个传输块中,传输块可被分段以产生多个码块。
此外,该通信***100可以是公共陆地移动网络PLMN网络或者设备对设备(device to device,D2D)网络或者机器对机器(machine to machine,M2M)网络或者其他网络,图1仅为便于理解而示例的简化示意图,网络中还可以包括其他网络设备,图1中未予以画出。
为便于理解,下面先介绍本申请实施例的相关背景。
以终端设备具有y个接收天线端口和z个功率放大器(power amplifier,PA)为例, 其中,z<y。在终端设备支持天线选择或者不支持天线选择的情况下,根据前述的多种定义方式,可以确定由y个天线端口中的x个天线端口组成第一天线端口集合,由y个天线端口中的m个天线端口组成第二端口集合。由于PA个数小于接收天线端口个数,因此,在网络设备准备进行下行数据调度时,无法靠SRS及时获得所有y个接收端口的准确下行信道状态信息。
为了解决TDD***下仅靠SRS无法使网络设备获取完整的下行信道矩阵的问题,可以采用如下信道状态信息的获取流程,使得网络设备可以获得完整的下行信道状态信息。
1)终端设备通过x个发送天线端口发送SRS,使网络设备获得x个发送天线端口的信道H
u;
2)该终端设备测量网络设备发送的CSI-RS,获取y个接收天线端口的信道信息,并反馈相应的指示信息。该指示信息指示该终端设备的y个天线端口中m个天线端口对应的信道矩阵信息H
d的信息,其中,m个端口与上述x个端口至少有一个端口不同;
但是,由于网络设备和终端设备的射频器件不同,导致网络设备测量的H
u信道中包含终端设备的发送SRS的功率的影响,即网络设备测量获得
G
srs为测量值,H
u为实际值;终端设备测量获得
G
csi-rs为测量值,H
u和H
d为实际值。在本文中,G
csi-rs,u又称为G
u,G
csi-rs,d又称为G
d。
网络设备将终端设备反馈的指示信息指示的信道
和自己测量的信道G
srs进行重构,得到信道矩阵
即两部分信道的功率增益不同。这将导致网络设备对该信道矩阵H
cons进行操作获得的预编码矩阵不准确。一种获得预编码矩阵的方法为对
进行奇异值分解(singular value decomposition,SVD)分解或特征值分解,将得到rank个主特征向量作为每一个数据层的预编码矩阵,由于功率增益不同,将导致主特征向量不准确。
因此,为了解决上述功率增益不同的问题,本申请实施例提出了一种新的上报信道状态信息的方法。
图2示出了本申请实施例的上报信道状态信息的方法200的示意性流程图。该方法200可以应用于图1所示的通信***100,但本申请实施例不限于此。
S210,网络设备向终端设备发送第一参考信号,则对应地,该终端设备接收该第一参考信号;
S220,该终端设备通过测量上述第一参考信号,获得第一指示信息,所述第一指示信息用于指示第一天线端口集合的信道信息与第二天线端口集合的信道信息之间的差分值,其中,所述第一天线端口集合包括所述终端设备的x个天线端口,所述第二天线端口集合包括所述终端设备的m个天线端口,所述第一天线端口集合和所述第二天线端口集合不同,x和m是正整数;
S230,该终端设备向网络设备发送该第一指示信息;则对应地,该网络设备接收该第一指示信息。
进一步地,网络设备可以根据上述第一指示信息,确定所述终端设备和所述网络设备之间的下行信道状态信息。
具体地,网络设备可以向终端设备发送第一参考信号,该终端设备接收该第一参考信号,并进行信道测量,获得下行信道状态。该终端设备根据测量所得的下行信道状态,确定终端设备的x个天线端口的信道状态信息相对于该终端设备的m个天线端口的信道状态信息之间的差分值。该终端设备可以将该差分值发送给网络设备,以便网络设备根据该差分值消除两部分天线端口对应的信道状态信息之间由于功率因子不同造成的影响,从而获得更准确的下行信道状态信息。
本申请实施例的上报信道状态信息的方法,通过终端设备上报两部分天线端口之间的信道状态信息的差分值,使得网络设备能够根据该差分值消除网络设备和终端设备的发送功率不同的影响,有利于提高网络设备所获取的信道状态信息的准确性,从而提高数据传输性能。
应理解,在本申请实施例中,A与B的差分值(differential value),可以是线性域的A和B的差分值,也可以是变换域(例如,dB域)的A和B的差分值。以线性域差值为例,A与B的差分值,可以是A-B,或者B-A,或者A/B,或者B/A。以dB域差值为例,A与B的差分值,可以是A(dB)-B(dB),或者B(dB)-A(dB),或者A(dB)/B(dB),或B(dB)/A(dB)。其中,X(dB)表示X变换到dB之后的取值。具体的,由线性域变换到dB域的定义可以是:X(dB)=20log
a(X)或X(dB)=10log
a(X),a为自然数,X为线性域的取值。但本实施例对其他变换域并不排除。
作为一个可选的实施例,所述方法还包括下列步骤中的至少一个:
所述终端设备发送所述第二天线端口集合的信道状态信息,则对应地,所述网络设备接收所述第二天线端口集合的信道状态信息;
所述终端设备通过所述第一天线端口集合发送第二参考信号,则对应地,所述网络设备接收第二参考信号。
具体地,网络设备可以接收第二参考信号(例如SRS),并进行信道测量,由于该第二参考信号是终端设备通过第一天线端口集合中的全部或部分端口发送的,因此,该网络设备通过信道测量只能获得y个天线端口中一部分天线端口的信道状态信息。对于另外一部分信道,即对应本实施例中的第二天线端口集合,该网络设备可以向终端设备发送第一参考信号(例如CSI-RS),终端设备接收该第一参考信号进行信道测量后将第二天线端口集合的信道状态信息上报给该网络设备,并将第一天线端口集合的信道状态信息与第二天线端口集合的信道状态信息之间的差分值上报给该网络设备。网络设备可以根据信道互易性,将上述第一天线端口集合的上行信道状态信息确定为该第一天线端口集合的下行信道状态信息。然后,该网络设备可以根据该终端设备上报的上述第一指示信息和第二天线端口集合的信道状态信息,消除第一天线端口集合和第二天线端口集合的功率影响,从而重构出准确的下行信道状态信息。
在一种可能的实现方式中,具体流程如图3所示,包括:
S310,网络设备向终端设备发送第一参考信号(例如CSI-RS),该终端设备接收该第一参考信号;
S320,该终端设备可以根据该第一参考信号进行下行信道测量,获得第一指示信息;
S330,该终端设备向网络设备发送该第一指示信息,该网络设备接收该第一指示信息;
S340,该终端设备向网络设备发送第二天线端口集合的信道状态信息,该网络设备接收该第二天线端口集合的信道状态信息;
S350,该终端设备通过第一天线端口集合向网络设备发送第二参考信号(例如SRS),该网络设备接收该第二参考信号;
S360,该网络设备可以根据该第二参考信号进行信道测量,获得第一天线端口集合的信道状态信息,结合终端设备上报的第一指示信息所指示的第一天线端口集合的信道信息和第二天线端口集合的信道信息之间的差分值,以及第二天线端口集合的信道状态信息,确定最终的下行信道状态信息。
本申请实施例的上报信道状态信息的方法,网络设备通过第二参考信号获得第一天线端口集合对应的信道信息,并通过终端设备反馈获得第二天线端口对应的信道信息,两者结合获得完整的下行信道信息。由于只需要反馈部分天线端口对应的信道信息,可以在解决TDD***下不具有信道互易性时CSI不准确问题的同时,降低反馈开销。
可选地,第一参考信号用于确定第二天线端口集合的信道状态信息和第一天线端口集合的信道状态信息,从而进一步获得上述第一指示信息。具体而言,该终端设备可以测量第一参考信号,确定第一天线端口集合的端口对应的信道矩阵G
u和第二天线端口集合的端口对应的信道矩阵G
d,进一步地,该终端设备可以根据G
u中元素的幅度信息确定第一幅度信息,根据G
d中元素的幅度信息确定第二幅度信息,进而确定第一幅度信息和第二幅度信息的差分值。该终端设备可以根据该差分值(或者执行差分值的量化等操作),最终获得第一指示信息。
应理解,终端设备接收第一参考信号可以指该终端设备通过第二天线端口集合的全部或部分天线端口以及第一天线端口集合的全部或部分天线端口接收第一参考信号。
具体地,终端设备通过测量第一参考信号确定并反馈的信道状态信息对应的天线端口组成第一天线端口集合;终端设备发送第二参考信号对应的全部或部分天线端口组成第二天线端口集合。也就是说,在本申请实施例中,网络设备获取第一天线端口集合的信道状态信息的方式和获取第二天线端口集合的信道状态信息的方式是不同的。其中,上述第一天线端口集合和第二天线端口集合可以是有交集的(即两个集合中存在部分天线端口相同),也可以交集为空,本申请实施例对此不作限定。
举例而言,终端设备有4个天线端口,分别为端口1、端口2、端口3和端口4,并且具有2个功率放大器(power amplifier,PA)。不失一般性的,端口的编号也可以从0开始,本申请实施例对此不作约束。
若该终端设备不支持天线选择功能,PA连接端口1和端口2。在一种可能的实现方式中,第一天线端口集合是由端口1和端口2组成的,第二天线端口集合是由端口3和端口4组成的。此时,第一天线端口集合和第二天线端口集合的交集为空集。网络设备通过第二参考信号可以获得端口1和端口2的信道状态,通过该终端设备的反馈可以获得端口3和端口4的信道状态。在另一种可能的实现方式中,第二天线端口集合可以是由端口3和端口4中的一个端口组成的,第一天线端口集合是由端口1和端口2组成的。此时,第一天线端口集合和第二天线端口集合的交集为空集。这是由于网络设备可以决定每 个终端设备的调度数据层数,若该网络设备确定了当前只会针对该终端设备最多调度3层数据(假设对应端口1、端口2和端口3),则通过第二参考信号获得了端口1和端口2的信道状态后,可以只需要获得另外一个端口(即端口3)的信道状态信息。这种方式有可能会带来一定的性能损失,但是可以降低上报开销。
在另一种可能的实现方式中,第一天线端口集合是由端口1和端口2组成的,第二天线端口集合是由端口1、端口3和端口4组成的。此时,第一天线端口集合和第二天线端口集合有交集,但是两者不同。在这种情况下,网络设备可以通过第二参考信号获得端口1的信道状态,但是网络设备判断端口1的信道的信噪比(signal noise ratio,SNR)太低,所以通过测量第二参考信号获得的端口1的信道状态不准确,可以让终端设备通过测量第一参考信号将端口1的信道状态信息也报上来,从而重构更准确的信道。
若该终端设备支持天线选择功能,PA通过开关切换可以在一个时刻连接端口1和端口2,在另外一个时刻连接端口3和端口4。在一种可能的实现方式中,第一天线端口集合是由端口1、端口2、端口3和端口4共同组成的,第二天线端口集合是由端口3和端口4组成的。此时,第一天线端口集合和第二天线端口集合的交集不为空集,但是两者不同。一个应用场景为:终端设备在时刻n
1+T,n
1+2T….上周期性地使用端口1和端口2发送第二参考信号,在时刻n
2+T,n
2+2T上周期性地使用端口3和端口4发送第二参考信号。在某个n
3时刻,网络设备决定触发终端设备上报CSI。此时,假设离n
3时刻最近的一次第二参考信号是终端设备通过端口1和端口2发送的,故端口1和端口2的信道状态信息还可以使用,而端口3和端口4的信道状态信息太陈旧不能使用了。因此,网络设备可以触发终端设备上报端口3和端口4对应的信道状态信息,从而可以提高重构信道的准确程度。
在上述应用场景中,也可以定义第二天线端口集合可以是由端口3和端口4组成的,第一天线端口集合是由端口1和端口2组成的。在这种定义方式下,网络设备通过终端设备的反馈获得信道状态信息的端口组成第二天线端口集合,仅通过测量第二参考信号获得信道状态信息的端口组成第一天线端口集合。此时,第一天线端口集合和第二天线端口集合的交集为空集。
应理解,本申请对第二天线端口集合和第一天线端口集合的具体定义不作限定,只约束两者不同。
作为一个可选的实施例,所述第一指示信息为宽带参数,或所述第一指示信息为子带参数。
具体地,如果上述第一指示信息为宽带参数,那么针对CSI整个上报带宽,终端设备只需要上报一个第一指示信息。如果第一指示信息为子带参数,那么针对CSI上报带宽中的每个子带,终端设备都需要上报一个第一指示信息。
作为一个可选的实施例,所述第一天线端口集合的信道状态信息包括与所述第一天线端口集合的信道矩阵G
u相关联的第一幅度信息;和/或
所述第二天线端口集合的信道状态信息包括与所述第二天线端口集合的信道矩阵G
d相关联的第二幅度信息;
其中,G
d是m行M列的矩阵,G
u是x行M列的矩阵,M是正整数。
具体地,第一天线端口集合的信道矩阵G
u指的是第一天线端口集合中的全部或部分 的天线端口对应的信道向量组成的矩阵。具体的形式可以是:设第一天线端口集合中的第i个端口对应的信道向量表示为G
u,i,则G
u,i=[g
u,i,1 g
u,i,2 ... g
u,i,M]∈C
1×M,其中,g
u,i,j表示网络设备的第j个天线端口与上述第i个天线端口之间的信道系数,为复数。则以全部天线端口为例,第一天线端口集合中的全部天线端口对应的信道向量组成的矩阵表示为
x表示第一天线端口集合包括的端口个数,M为网络设备的发送第一参考信号的端口数。第一天线端口集合中的部分天线端口对应的信道向量组成的矩阵G
u的表达形式是类似的,此时,G
u的行数为部分天线端口中天线端口的个数。
类似的,第二天线端口集合的信道矩阵G
d是第二天线端口集合中的全部或部分端口对应的信道向量组成的矩阵。具体的形式可以是:设第二天线端口集合中的第i个端口对应的信道向量表示为G
d,i,则G
d,i=[g
d,i,1 g
d,i,2 ... g
d,i,M],其中,g
d,i,j表示网络设备的第j个天线端口与上述第i个天线端口之间的信道系数,为复数。则以全部端口为例,第二天线端口集合中的全部天线端口对应的信道向量组成的矩阵表示为
m表示第二天线端口集合包括的端口个数,M为网络设备的发送第一参考信号的端口数。第二天线端口集合中的部分天线端口对应的信道向量组成的矩阵G
d的表达形式是类似的,此时,G
d的行数为部分天线端口中天线端口的个数。
终端设备可以根据第一参考信号的测量获得G
u和G
d矩阵。
上述与G
u相关联的第一幅度信息可以是信道矩阵G
u中某个元素的幅度信息,也可以是对G
u中的全部或部分元素经过某种处理获得的一个幅度信息;上述与G
d相关联的第二幅度信息可以是信道矩阵G
d中某个元素的幅度信息,也可以是对G
d中的全部或部分元素经过某种处理获得的一个幅度信息,本申请实施例对此不作限定。应理解,上述第一幅度信息可以是子带幅度信息,也可以是宽带幅度信息,上述第二幅度信息可以是子带幅度信息,也可以是宽带幅度信息,本申请实施例对此不作限定。
以与G
u相关联的第一幅度信息为例,该第一幅度信息可以是幅度的函数,例如,该第一幅度信息可以是幅度本身,也可以是功率,还可以是幅度或功率变换到其他域(例如dB域)之后的取值,例如,由线性域变换到dB域,X(dB)=20log
a(X)或X(dB)=10log
a(X),a为自然数,X为线性域的取值,还可以是幅度或功率或其变换到dB域之后经过某种处理(例如归一化或量化)之后的取值,本申请实施例对此不作限定。
可选地,第一幅度信息可以是G
u中某个元素的幅度信息的函数。可选地,上述第一幅度信息可以是对G
u中的全部或部分元素的幅度信息的函数。
第二天线端口集合的信道状态信息与上述第一天线端口集合的信道状态信息类似,此处不再赘述。
在本申请实施例中,第一指示信息可以为宽带参数,也可以为子带参数。
若第一指示信息为宽带参数,那么第一幅度信息和第二幅度信息就是宽带幅度信息。在一种可能的实现方式中,在每个子带上,第二天线端口集合的信道矩阵G
d的(全部或部分)元素或者G
d对应的矩阵W
2,d的(全部或部分)元素的幅度由宽带幅度和子带差分 幅度联合表示,则终端设备在上报G
d时,可以将上述全部或部分元素的宽带幅度以第一幅度信息为基准做归一化处理,将子带差分幅度正常上报。在另一种可能的实现方式中,在每个子带上,G
d的全部或部分元素或者W
2,d的全部或部分元素的幅度直接以子带幅度表示,不拆分为宽带幅度加子带差分幅度的形式,则终端设备在上报G
d时,可以将上述全部或部分元素的子带幅度以第一幅度信息为基准做归一化。对应的,网络设备对第一天线端口集合的信道矩阵G
u的操作与终端设备对G
d的操作类似,此处不再赘述。
若第一指示信息为子带参数,那么第一幅度信息和第二幅度信息就是子带幅度信息。在一种可能的实现方式中,在每个子带上,G
d的(全部或部分)元素或者W
2,d的(全部或部分)元素的幅度直接以子带幅度表示,不拆分为宽带幅度加子带差分幅度的形式,则终端设备在上报G
d时,可以将上述元素的子带幅度以第一幅度信息的子带幅度为基准做归一化。对应的,网络设备对第一天线端口集合的信道矩阵G
u的操作与终端设备对G
d的操作类似,此处不再赘述。
在一种可能的实现方式中,上述信道状态信息为功率信息,功率是幅度的平方,因此可以也理解为上述信道状态信息是幅度的函数。
作为一个可选的实施例,所述第一幅度信息是根据下列任意一种元素确定的:
G
u的至少一行元素中幅度信息取值最大的元素、G
u对应的矩阵W
2,u中至少一列元素中幅度信息取值最大的元素、G
u的至少一个奇异值中幅度信息取值最大的奇异值、G
u的至少一个特征值中幅度信息取值最大的特征值;和/或
所述第二幅度信息是根据下列任意一种元素确定的:
G
d的至少一行元素中幅度信息取值最大的元素、G
d对应的矩阵W
2,d中至少一列元素中幅度信息取值最大的元素、G
d的至少一个特征值中幅度信息取值最大的特征值、G
d的至少一个奇异值中幅度信息取值最大的奇异值;
其中,G
u
T(l
u)=W
1×W
2,u(l
u),G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m}。
作为一个可选的实施例,所述第一幅度信息是根据G
u的至少一行元素中幅度信息取值最大的元素确定的,所述第二幅度信息是根据G
d的至少一行元素中幅度信息取值最大的元素确定的。
作为一个可选的实施例,所述第一幅度信息是根据G
u对应的矩阵W
2,u中至少一列元素中幅度信息取值最大的元素确定的,所述第二幅度信息是根据G
d对应的矩阵W
2,d中至少一列元素中幅度信息取值最大的元素确定的,其中,G
u
T(l
u)=W
1×W
2,u(l
u),G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m}。
在本申请实施例中,上述W
1为块对角阵,
A=[b
1,b
2,…b
L]由L个基向量构成,N=2L。具体的,W
1是宽带参数,W
2,u、W
2,d包括宽带参数(例如宽带幅度)和子带参数(例如子带差分幅度和子带相位),或者,W
2,u、W
2,d包括子带参数(例如子带幅度和子带相位)。终端设备可以通过反馈W
1的参数的索引和W
2的参数的索引来表 示G
u和G
d。
作为一个可选的实施例,所述第一幅度信息是根据G
u的至少一行元素中幅度信息取值最大的元素确定的,所述第二幅度信息是根据G
d对应的矩阵W
2,d中至少一列元素中幅度信息取值最大的元素确定的,其中,G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,d为N*m的矩阵,N是正整数,l
d∈{1,2,...,m}。
本实施例直接根据信道矩阵G
u确定第一幅度信息,可以避免终端设备对G
u进行双码本结构的分解,网络设备在重构完整信道状态矩阵的时候也无需对上行信道矩阵进行双码本结构的分解,能够在获得准确信道状态信息的同时,降低网络设备和终端设备的复杂度。
作为一个可选的实施例,所述第一幅度信息是根据G
u的至少一个奇异值中幅度信息取值最大的奇异值确定的,所述第二幅度信息是根据G
d的至少一个奇异值中幅度信息取值最大的奇异值确定的。
作为一个可选的实施例,所述第一幅度信息是根据G
u的至少一个特征值中幅度信息取值最大的特征值确定的,所述第二幅度信息是根据G
d的至少一个特征值中幅度信息取值最大的特征值确定的。
作为一个可选的实施例,所述第一幅度信息为第一元素的幅度信息,所述第一元素为G
u中的元素、G
u对应的矩阵W
2,u中的元素、G
u的奇异值或G
u的特征值;和/或
所述第二幅度信息为第二元素的幅度信息,所述第二元素为G
d中的元素、G
d对应的矩阵W
2,d中的元素、G
d的奇异值或G
d的特征值。
作为一个可选的实施例,所述第一幅度信息是根据G
u的至少一行元素中幅度信息取值最大的元素确定的,或所述第一幅度信息为第一元素的幅度信息,所述第一元素的索引为预定义的;
所述第二幅度信息包括n个子元素,所述n个子元素中的第i个子元素是根据G
d的n行中第i行的M个元素中幅度信息最大的元素确定的,n为正整数,i∈{1,2,...,n}。
作为一个可选的实施例,所述第一幅度信息是根据G
u对应的矩阵W
2,u的至少一列元素中幅度信息取值最大的元素确定的,或所述第一幅度信息为第一元素的幅度信息,所述第一元素的索引为预定义的;
所述第二幅度信息包括n个子元素,所述n个子元素中的第i个子元素是根据G
d对应的矩阵W
2,d的n列中第i列的N个元素中幅度信息最大的元素确定的,n为正整数,i∈{1,2,...,n};
其中,G
u
T(l
u)=W
1×W
2,u(l
u),G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m}。
在一种可能的实现方式中,上述n大于或等于2。
作为一个可选的实施例,所述G
d的至少一行包括n行,n为正整数,所述方法还包括:
所述终端设备发送第二指示信息,所述第二指示信息用于指示n个第三元素中除了所述第二元素之外,其余的n-1个第三元素的幅度信息与所述第二元素的幅度信息的差分值,其中,所述n个第三元素中的第i个第三元素是根据所述n行中第i行的M个元素中幅度 信息最大的元素确定的,所述第二幅度信息是根据所述第二元素的幅度信息确定的。
作为一个可选的实施例,所述矩阵W
2,d中的至少一列包括n列,n为正整数,所述方法还包括:
所述终端设备发送第三指示信息,所述第三指示信息用于指示n个第四元素中除了所述第二元素之外,其余的n-1个第四元素的幅度信息与所述第二元素的幅度信息的差分值,其中,所述n个第四元素中的第i个第四元素是根据所述n列中第i列的N个元素中幅度信息最大的元素确定的,所述第二幅度信息是根据所述第二元素的幅度信息确定的。
作为一个可选的实施例,所述方法还包括:所述终端设备发送第四指示信息,所述第四指示信息用于指示所述第一元素的索引和/或所述第二元素的索引。
作为一个可选的实施例,所述第一元素的索引为预定义的;和/或所述第二元素的索引为预定义的。
作为一个可选的实施例,所述第一幅度信息是根据G
u的至少两个元素的幅度信息确定的,或,该第一幅度信息是根据G
u对应的矩阵W
2,u的至少两个元素的幅度信息确定的;和/或
所述第二幅度信息是根据G
d的至少两个元素的幅度信息确定的;或,所述第二幅度信息是根据G
d对应的矩阵W
2,d的至少两个元素的幅度信息确定的;
其中,G
u
T(l
u)=W
1×W
2,u(l
u),G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m}。
具体地,根据幅度信息确定的可以是根据至少两个元素的幅度信息的函数确定的。可选地,上述函数可以是至少两个元素的幅度信息的求和,也可以是至少两个元素的幅度信息的平均值(例如,算数平均值、几何平均值、均方根平均值、或加权平均值等等)。进一步,元素幅度信息的平均值,可以是宽带幅度信息的平均值或子带幅度信息的平均值。
可选地,G
u的全部元素的宽带幅度信息的平均值为:
或者
或者,
或者,
其中G
u(f)是G
u在第f个子带上的取值,整个CSI上报带宽包括F个子带;|(G
u)
i,j|
WB表示G
u的第i行第j列元素的宽带幅度值;p为自然数。
可选地,在第f个子带上,G
u的全部元素的子带幅度信息的平均值为:|G
u(f)|
avg。
G
d的全部元素的宽带幅度信息和子带幅度信息的定义与G
u类似,此处不再赘述。
作为一个可选的实施例,所述第一幅度信息是根据G
u对应的矩阵W
2,u的至少两个元素的幅度信息的平均值确定的,所述第二幅度信息是根据G
d对应的矩阵W
2,d的至少两个元素的幅度信息的平均值确定的,其中,G
u
T(l
u)=W
1×W
2,u(l
u),G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为 M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m}。
可选地,在第f个子带上,W
2,u的全部元素的子带幅度信息的平均值为:|W
2,u(f)|
avg。
W
2,d的全部元素的宽带幅度信息和子带幅度信息的定义与W
2,u类似,此处不再赘述。
应理解,上述根据平均值确定的,可以包括平均值本身,也可以包括根据平均值的函数确定的,例如,根据全部或部分元素的幅度信息的求和值,其中,求和值是平均值的倍数,本申请实施例对此不作限定。
应理解,本申请实施例所提到的平均值可以是算数平均值,也可以是几何平均值、均方根平均值、或加权平均值,本申请实施例对此不作限定。
作为一个可选的实施例,所述第一幅度信息是根据G
u的至少两个元素的幅度信息的求和确定的,所述第二幅度信息是根据G
d的至少两个元素的幅度信息的求和确定的;或
所述第一幅度信息是根据G
u对应的矩阵W
2,u的至少两个元素的幅度信息的求和确定的,所述第二幅度信息是根据G
d对应的矩阵W
2,d的至少两个元素的幅度信息的求和确定的。
进一步,至少两个元素幅度信息的加权求和,可以是宽带幅度信息的加权求和或子带幅度信息的加权求和。上述根据求和确定的,可以包括幅度信息求和值本身,也可以包括根据求和值的函数确定的,例如,根据至少两个元素的幅度信息的求和值,其中,幅度信息是求和值的倍数,本申请实施例对此不作限定。
作为一个可选的实施例,所述第一幅度信息是根据G′
u的范数信息确定的,所述第二幅度信息是根据G′
d的范数信息确定的。其中,G′
u包括G
u的至少两个元素,G′
d包括G
d的至少两个元素。
应理解,矩阵G′
u的范数信息可以是G′
u的子带
p范数的函数,也可以是G′
u的宽带p范数的函数,还可以是子带p范数的平均值的函数,本申请实施例对此不作限定,其中p是自然数。具体的,p范数可以是Frobenius范数。下面以G′
u=G
u为例进行说明。一个a行b列的矩阵X的p范数为:
X
ij表示X的第i行第j列的元素。
G
d的范数信息与G
u的范数信息类似,此处不再赘述。
作为一个可选的实施例,所述第一幅度信息是根据G′
u对应的矩阵W
2,u的范数信息确定的,所述第二幅度信息是根据G′
d对应的矩阵W
2,d的范数信息确定的,其中,
X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m}。
应理解,矩阵W
2,u的范数信息可以是W
2,u的子带p范数的函数,也可以是W
2,u的宽带p范数的函数,还可以是子带p范数的平均值的函数,本申请实施例对此不作限定,其中p是自然数。具体的,p范数的定义与上面的定义类似,此处不再赘述。
作为一个可选的实施例,所述第一天线端口集合为预定义的、所述终端设备根据网络设备的配置确定的、或根据所述终端设备上报的终端能力确定的;和/或
所述第二天线端口集合为预定义的、所述终端设备根据网络设备的配置确定的、或根据所述终端设备上报的终端能力确定的。
具体地,上述第一天线端口集合可以是预定义的,也可以是网络设备为该终端设备配置的(即终端设备根据网络设备的配置确定的),还可以是终端设备根据自身的能力确定的,本申请实施例对此不作限定。同理,上述第二天线端口集合可以是预定义的,也可以是网络设备为该终端设备配置的(即终端设备根据网络设备的配置确定的),还可以是终端设备根据自身的能力确定的,本申请实施例对此也不作限定。
在一种可能的实现方式中,第一天线端口集合和第二天线端口集合可以是预定义的,例如,可以预定义距网络设备触发终端设备上报信道状态信息的时刻最近的k次发送第二参考信号的天线端口组成第一天线端口集合,终端设备的y个天线端口中的剩余其他天线端口为第二天线端口集合,k为正整数。
在另一种可能的实现方式中,第一天线端口集合和第二天线端口集合可以是根据网络设备的配置确定的。例如,网络设备可以通过配置信息指示终端设备上报信道状态信息的天线端口是哪几个,则这几个天线端口为第二天线端口集合,终端设备的y个天线端口中剩余的其他天线端口即组成第一天线端口集合。又例如,网络设备可以指示终端设备上报的信道状态信息不针对哪几个天线端口,则这几个天线端口组成第一天线端口集合,其他天线端口组成第二天线端口集合。应理解,具体的指示方式可以是直接指示,也可以是间接指示,本申请实施例对此不作限定。若采用直接指示,网络设备可以指示天线端口的端口号,若采用间接指示,网络设备可以指示天线端口的端口个数。
在另一种可能的实现方式中,第一天线端口集合和第二天线端口集合可以是根据终端能力确定的,该终端能力可以由终端设备上报给网络设备。例如,终端设备上报自己为2发4收(2T4R),则第一天线端口集合为4个天线端口中的2个天线端口,第二天线端口集合为4个天线端口中除上述2个天线端口的另外2个天线端口。
作为一个可选的实施例,所述第一天线端口集合和/或所述第二天线端口集合是所述终端设备通过所述网络设备发送的以下信令中的至少一个中所携带的配置信息确定的:无 线资源控制RRC、多址接入控制MAC控制元素CE和下行控制信息DCI。
具体地,若上述第一天线端口集合和/或第二天线端口集合是终端设备根据网络设备的配置确定的,则网络设备可以向终端设备发送无线资源控制(radio rource control,RRC)信令、多址接入控制(multiple access control)MCA控制元素(control element,CE)信令以及下行控制信息(downlink control information,DCI)信令中的至少一种,来配置该第一天线端口集合和/或第二天线端口集合。下面分几种情况进行详细介绍,但应理解,下面的情况仅仅作为示例,对本申请实施例的保护范围不构成任何影响。
1)RRC:网络设备可以通过RRC信令指示信道状态信息上报的配置信息,该配置信息可以直接用于确定第一天线端口集合和/或第二天线端口集合。终端设备接收该配置信息,根据该配置信息即可确定第一天线端口集合和/或第二天线端口集合。可选地,该信道状态信息上报是周期的。
2)RRC+DCI:网络设备可以通过RRC信令指示信道状态信息上报的配置信息,该配置信息可以用于确定第一天线端口集合和/或第二天线端口集合。网络设备通过DCI触发终端设备上报信道状态信息。可选地,该信道状态信息上报是非周期或半持续(semi-persistent)的。
3)RRC+DCI:终端设备为2T4R,并且支持天线选择。网络设备可以通过RRC信令指示信道状态信息上报的配置信息,该配置信息可以确定第二天线端口集合包括终端设备的4个天线端口中的全部天线端口。由于每次只有2个天线端口发送第二参考信号,因此,网络设备可以通过DCI选择本次上报不针对或针对的天线端口是4个天线端口中的哪两个天线端口。例如,4个端口的编号分别为0、1、2、3,网络设备可通过DCI选择本次上报针对的端口为端口1和端口2,从而终端设备确定本次的第一天线端口集合包括端口1和端口2,第二天线端口集合包括端口3和端口4。
在本申请实施例中,通过RRC配置一个较大的集合,DCI选择该集合中的子集作为第一天线端口集合,实现更加灵活,可以降低RRC配置的信道状态信息上报的个数。例如,如果终端设备的4个天线端口中有两个天线端口的信道SNR较低,这两个天线端口的SRS测量会很不准确,导致下行数据的预编码不准确。通过DCI触发这两个天线端口的信道状态的反馈,可以提高这两个端口信道信息的准确程度。
4)RRC+MAC CE+DCI:网络设备可以通过RRC发送配置信息,用于指示多个可能的天线端口集合,再通过MAC CE从多个可能的天线端口集合中选择一部分天线端口集合作为备选集合,最后通过DCI从备选集合中选择一个天线端口集合作为本次上报对应的第一天线端口集合和/或第二天线端口集合。
作为一个可选的实施例,所述第一参考信号为信道状态信息参考信号CSI-RS;和/或所述第二参考信号为探测参考信号SRS。
为便于理解,下面结合具体实施例对本申请进行详细说明。在下面的实施例中,第一天线端口集合和第二天线端口集合的交集为空集。但应理解,第一天线端口集合和第二天线端口集合的交集不为空集的例子原理与第一天线端口集合和第二天线端口集合的交集为空集的例子相同,在此不一一列举。
终端设备共具有x+m个接收天线端口,其中的x个端口也可以作为发送天线端口,另外m个端口不可以作为发送天线端口,本实施例中称该m个端口为非发送天线端口。 终端设备通过x个天线端口(即上述第一天线端口集合)发送SRS,网络设备获得x个发送天线端口的信道矩阵
其中,H
u,i∈C
1×M(i=1,...,x)表示网络设备与第i个发送天线端口之间的信道向量,
表示与终端设备发送SRS相关的功率因子,M表示网络设备的天线端口数。可选地,发送SRS的x个天线端口可以是网络设备配置的。
网络设备可以通过M个天线端口发送CSI-RS,终端设备通过测量CSI-RS,估计网络设备到该终端设备的x+m个接收天线端口的下行信道矩阵
其中,
包括网络设备到终端设备的m个天线端口(即上述第二天线端口集合)的下行信道向量,
表示与网络设备发送CSI-RS相关的功率因子。在本申请实施例中,G
csi-rs,u即为上述G
u,G
csi-rs,d即为上述G
d。
终端设备的上报的信息可以分为下列几种情况:
实施例一
终端设备用显式反馈的方法反馈信道矩阵G
csi-rs,d的相关信息。例如,终端设备逐元素地反馈上述m个非发送天线端口的信道向量,以及m个非发送天线端口的信道与x个发送天线端口的信道之间的相对功率值(即上述第一指示信息)。具体的反馈方式如下:
1)终端设备可以基于CSI-RS测量,确定第一天线端口集合对应的x个信道向量中,位置为l
1的元素的宽带幅度值
可选地,l
1可以是预定义的,也可以是终端设备选择的,若l
1是终端设备选择的,终端设备需要上报l
1的信息,即为PMI
1,0。
2)针对第二天线端口集合中,上述m个非发送天线端口中第i个天线端口对应的信道向量H
d,i包括的M个元素;终端设备可以上报下列信息中的至少一种:
宽带反馈PMI
1,1,i,指示H
d,i的M个元素中宽带幅度最大的元素位置,记为l
2,i;
宽带反馈PMI
1,3,i,指示H
d,i的其余M-1个位置上元素的宽带幅度与|H
d,i(l
2,i)|
WB的比值,记为y
i,j(j∈{1,2,...M});
子带反馈PMI
2,i,指示H
d,i在每个子带上的M个元素的子带差分幅度z
i,j和子带相位u
i,j。
上述各幅度和相位均可以进行量化。具体的,上述宽带幅度比值x
l2,i的量化区间可以是[-X,X]dB,X是正整数,量化的间隔可以是Y dB,即量化后的比值是集合{-X,-X+Y,-X+2Y,…,X-Y,X}中的元素。
网络设备可以根据终端设备上报的PMI恢复的第i个端口对应的信道矩阵为:
H
d,i′=[h′
i,0....h′
i,M-1],
在该实施例中,l
1和l
2,i指示的是宽带幅度相关的信息,因此,第一指示信息为宽带参数。
本申请实施例通过上报或预定义归一化元素位置(l
1)、以及上报发送天线端口与非发送天线端口的信道信息的差分值(即上述x
l2,i),能够解决TDD***没有信道互易性时的反馈方案中,由于SRS和CSI-RS发送功率不同导致的预编码矩阵不准确问题。
实施例二
终端设备可以采用双码本结构反馈上述m个非发送天线端口的信道向量,以及m个非发送天线端口的信道信息与x个发送天线端口信道信息的差分值。具体的反馈方式如下:
2)根据选择的W
1矩阵,获得上述m个非发送天线端口中第i个端口的下行信道向量G
csi-rs,d(f,i)在第f个子带上的W
2,i(f)矩阵(G
csi-rs,d(f,i)表示在第f个子带上G
csi-rs,d的第i行),使得G
csi-rs,d(f,i)
T=W
1W
2,i(f)。为了表示简单,下面忽略子带f的标识。W
2,i矩阵的形式为W
2,i=[c
i,0,...,c
i,2I-1]
T,包括2I个线性组合系数(i=1,…,m);
3)在整个带宽上选择G
csi-rs,u中的一个元素,其位置为l
1,l
1的取值范围为0~x*M。
终端设备可以上报下列信息中的至少一种:
3.1)宽带反馈PMI
1,0,PMI
1,0在整个带宽上指示G
csi-rs,u一个元素的位置l
1。可选地,l
1可以是预定义的,则此时终端设备不需要上报PMI
1,0;
3.2)宽带反馈PMI
1,1,i,指示第i个矩阵W
2,i的2I个元素中宽带幅度最大的元素位置l
2,i;
3.4)宽带反馈PMI
1,3,i,指示W
2,i的其余2I-1个位置的元素的宽带幅度y与|W
2,i(l
2,i)|
WB的比值,记为y
i,j(j∈{1,2,...M})。
这一步中,用|W
2,i(l
2,i)|
WB进行功率归一化的目的在于将除了位置l
2,i之外的其他2I-1个元素的宽带幅度的取值范围限制在0~1之间。固定的量化区间方便对这些宽带幅度进行量化,降低量化比特数。
上述各幅度和相位均可以进行量化。具体的,宽带幅度比值x
l2,i的量化区间可以是[-X, X]dB,X是正整数,量化的间隔可以是Y dB,即量化后的比值是集合{-X,-X+Y,-X+2Y,…,X-Y,X}中的元素。
3.5)子带反馈PMI
2,i,指示W
2,i在每个子带上的M个元素的子带差分幅度z
i,j和子带相位u
i,j。
通过终端设备的上报,网络设备可以重构完整的信道矩阵。具体地,该网络设备可以根据PMI
1,0,以G
srs中位置l
1的元素的宽带幅度值(假设表示为
)为基准对G
srs进行归一化,从而消除SRS发送功率因子的影响,得到
根据其它PMI,该网络设备可以恢复消除了CSI-RS发送功率因子影响的第i个非发送天线端口的信道:
H′
d,i=W
1W
2,i
此时,网络设备基于该信道矩阵得到的预编码矩阵是准确的,不再受到SRS和CSI-RS不同的发送功率因子的影响。
本申请实施例使用双码本结构,通过上报或预定义归一化元素位置(l
1)、以及上报发送天线端口与非发送天线端口的信道信息的差分值(即上述x
l2,i),能够解决TDD***没有信道互易性时的反馈方案中,由于SRS和CSI-RS发送功率不同导致的预编码矩阵不准确问题。
此外,本实施例直接根据信道矩阵G
u确定第一幅度信息,可以避免终端设备对G
u进行双码本结构的分解,网络设备在重构完整信道状态矩阵的时候也无需对上行信道矩阵G
srs进行双码本结构的分解,能够在获得准确信道状态信息的同时,降低网络设备和终端设备的复杂度。
实施例三
终端设备可以采用双码本结构反馈上述m个非发送天线端口的信道向量,以及m个非发送天线端口的信道信息与x个发送天线端口信道信息的差分值。具体的反馈方式如下:
2)根据选择的W
1矩阵,获得上述m个非发送天线端口中第i个端口的下行信道向量G
csi-rs,d(f,i)在第f个子带上的W
2,i(f)矩阵(G
csi-rs,d(f,i)表示在第f个子带上G
csi-rs,d的第i行),使得G
csi-rs,d(f,i)
T=W
1W
2,i(f)。为了表示简单,下面忽略子带f的标识。W
2,i矩阵的形式为W
2,i=[c
i,0,...,c
i,2I-1]
T,包括2I个线性组合系数(i=1,…,m);
3)根据选择的W
1矩阵,获得G
csi-rs,u中每一行的信道向量G
csi-rs,u(i)的W
2,i矩阵,并在整个带宽上从这x个W
2,i个矩阵中选择一个元素位置(记为l
1),G
csi-rs,u在该位置上的元素的宽带幅度记为
)。
终端设备可以上报下列信息中的至少一种:
3.1)宽带反馈PMI
1,0,PMI
1,0在整个带宽上指示上述元素位置l
1。可选地,l
1可以是 预定义的,则此时终端设备不需要上报PMI
1,0;
3.2)宽带反馈PMI
1,1,i,指示上述第i个矩阵W
2,i的2I个元素中宽带幅度最大的元素位置l
2,i;
3.4)宽带反馈PMI
1,3,i,指示W
2,i的其余2I-1个位置的元素的宽带幅度与|W
2,i(l
2,i)|
WB的比值,记为y
i,j(j∈{1,2,...M})。
这一步中,用|W
2,i(l
2,i)|
WB进行功率归一化的目的在于将除了位置l
2,i之外的其他2I-1个元素的宽带幅度的取值范围限制在0~1之间。固定的量化区间方便对这些宽带幅度进行量化,降低量化比特数。
3.5)子带反馈PMI
2,i,指示W
2,i在子带f上的2I个元素的子带差分幅度z
i,j和子带相位u
i,j。
上述幅度和相位信息均可以量化。具体的,宽带幅度比值x
l2,i的量化区间可以是[-X,X]dB,X是正整数,量化的间隔可以是Y dB,即量化后的比值是集合{-X,-X+Y,-X+2Y,…,X-Y,X}中的元素。
通过终端设备的上报,网络设备可以重构完整的信道矩阵。具体地,该网络设备可以根据PMI
1,1和PMI
1,0,得到
对应的W
2矩阵中位置l
1位置上的元素的宽带幅度值(假设表示为
),以
为基准对G
srs对应的W
2矩阵进行归一化,从而消除SRS发送功率因子的影响,得到
根据其它PMI,网络设备获得消除了CSI-RS功率因子影响的第i个非发送端口的信道向量:
H′
d,i=W
1W
2,i
此时,网络设备基于该信道矩阵得到的预编码矩阵是准确的,不再受到SRS和CSI-RS不同的发送功率因子的影响。
实施例四
该网络设备通过M个天线端口发送CSI-RS,终端设备通过测量CSI-RS,估计网络设备到自身的x+m个接收天线端口的信道
其中,G
csi-rs,u的特征值分解为
Λ
csirs,u由特征值
i=1,…,x)组成。G
csi-rs,d的特征值分解为
Λ
csirs,d由特征值
(i=1,…,m)组成。
终端设备反馈上述m个天线端口的G
csi-rs,d的R个特征向量和对应的特征值指示信息,1<=R<=m。每个特征值指示信息指示G
csi-rs,d的第r个特征值
与G
csi-rs,u的某一个特征值
(可以是终端设备选择的,也可以是预定义的)的比值
特征向量的反馈方法可以采用现有技术的双码本结构,此处不再赘述。若
是终端设备选择的,则该终端设备还需要反馈该特征值的索引i
0(类似于上面实施例的l
1),如果是预定义的(例如,是G
csi-rs,u的最大特征值),则不需要反馈该特征值的索引。
本申请实施例的上报信道状态信息的方法,通过终端设备反馈非发送天线端口信道的特征值信息和特征向量信息,使网络设备可以恢复完整的下行信道矩阵的相关矩阵。此外,通过该终端设备反馈发送天线端口信道的相关矩阵用于非发送天线端口特征值归一化元素的位置(上述索引i
0),以及反馈发送天线端口信道的特征值与非发送天线端口信道的特征值的比值(上述
能够解决由于SRS和CSI-RS发送功率不同导致的预编码矩阵不准确问题。
实施例五
终端设备可以采用显式反馈的方法反馈信道矩阵G
csi-rs,d的相关信息。例如,终端设备逐元素地反馈上述m个非发送天线端口的信道向量,以及m个非发送天线端口的信道与x个发送天线端口的信道之间的相对功率值(即上述第一指示信息)。假设CSI的上报带宽包括F个子带。具体的反馈方式如下:
1)终端设备可以基于CSI-RS测量,确定第f个子带上,第一天线端口集合对应的x个信道向量中,位置l
1(f)的元素的子带幅度值
可选地,l
1(f)可以是预定义的,也可以是终端设备选择的,若l
1(f)是终端设备选择的,终端设备上报l
1(f)的信息,即为PMI
0。
2)针对第二天线端口集合中,在第f个子带上,上述m个非发送天线端口中第i个 天线端口对应的信道向量H
d,i(f)包括的M个元素;终端设备可以上报下列信息中的至少一种:
反馈PMI
1,i,指示第f个子带上的H
d,i的M个元素中子带幅度最大的元素位置,记为l
2,i(f);
反馈PMI
3,i,指示第f个子带上的H
d,i的其余M-1个位置上元素的子带幅度与|H
d,i(l
2,i)|的比值,记为y
i,j(f)(j∈{1,2,...M});
反馈PMI
4,i,指示第f个子带上的H
d,i的M个元素的子带相位u
i,j。
上述各幅度和相位均可以进行量化。具体的,上述幅度比值xl2,i(f)的量化区间可以是[-X,X]dB,X是正整数,量化的间隔可以是Y dB,即量化后的比值是集合{-X,-X+Y,-X+2Y,…,X-Y,X}中的元素。
为了描述方面,本实施例后面将省略子带f的标识。
网络设备可以根据终端设备上报的PMI恢复第f个子带上,第i个端口对应的信道矩阵为:
H
d,i′=[h′
i,0....h′
i,M-1],
此外,网络设备可以根据SRS测量到的第f个子带上的信道矩阵
的所有元素,以在上述位置l
1(f)上的元素的宽带幅度|G
srs(l
1(f))|为基准做归一化,得到H′
u,则该矩阵不包括SRS发送功率因子的影响。
在该实施例中,l
1(f)和l
2,i(f)指示的是子带幅度相关的信息,因此,第一指示信息为子带参数。
本申请实施例通过上报或预定义归一化元素位置(l
1(f))、以及上报发送天线端口与非发送天线端口的信道信息的差分值(即上述x
l2,i(f)),能够解决TDD***没有信道互易性时的反馈方案中,由于SRS和CSI-RS发送功率不同导致的预编码矩阵不准确问题。
应理解,上述各过程的序号的大小并不意味着执行顺序的先后,各过程的执行顺序应以其功能和内在逻辑确定,而不应对本申请实施例的实施过程构成任何限定。
上文中结合图1至图3,详细描述了根据本申请实施例的上报信道状态信息的方法,下面将结合图4至图7,详细描述根据本申请实施例的上报信道状态信息的装置。
图4示出了本申请实施例提供的上报信道状态信息的装置400,该装置400可以是前 述实施例中的终端设备,也可以为终端设备中的芯片。该装置400包括:
获取单元410,用于获得第一指示信息,所述第一指示信息用于指示第一天线端口集合的信道状态信息与第二天线端口集合的信道状态信息之间的差分值,其中,所述第一天线端口集合包括所述装置的x个天线端口,所述第二天线端口集合包括所述装置的m个天线端口,所述第一天线端口集合和所述第二天线端口集合不同,x和m是正整数;
收发单元420,用于发送所述第一指示信息。
本申请实施例的上报信道状态信息的装置,通过终端设备上报两部分天线端口之间的信道状态信息的差分值,使得网络设备能够根据该差分值消除网络设备和终端设备的发送功率不同的影响,有利于提高网络设备所获取的信道状态信息的准确性,从而提高数据传输性能。
可选地,所述第一指示信息为宽带参数,或所述第一指示信息为子带参数。
可选地,其特征在于,所述第一天线端口集合的信道状态信息包括与所述第一天线端口集合的信道矩阵G
u相关联的第一幅度信息;和/或
所述第二天线端口集合的信道状态信息包括与所述第二天线端口集合的信道矩阵G
d相关联的第二幅度信息;
其中,G
d是m行M列的矩阵,G
u是x行M列的矩阵,M是正整数。
可选地,所述第一幅度信息是根据下列任意一种元素确定的:G
u的至少一行元素中幅度信息取值最大的元素、G
u对应的矩阵W
2,u中至少一列元素中幅度信息取值最大的元素、G
u的至少一个奇异值中幅度信息取值最大的奇异值、G
u的至少一个特征值中幅度信息取值最大的特征值;和/或
所述第二幅度信息是根据下列任意一种元素确定的:G
d的至少一行元素中幅度信息取值最大的元素、G
d对应的矩阵W
2,d中至少一列元素中幅度信息取值最大的元素、G
d的至少一个特征值中幅度信息取值最大的特征值、G
d的至少一个奇异值中幅度信息取值最大的奇异值;
其中,G
u
T(l
u)=W
1×W
2,u(l
u),G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m}。
可选地,所述第一幅度信息是根据G
u的至少一行元素中幅度信息取值最大的元素确定的;
所述第二幅度信息包括n个子元素,所述n个子元素中的第i个子元素是根据G
d的n行中第i行的M个元素中幅度信息最大的元素确定的,n为正整数,i∈{1,2,...,n}。
可选地,所述第一幅度信息是根据G
u对应的矩阵W
2,u的至少一列元素中幅度信息取值最大的元素确定的;
所述第二幅度信息包括n个子元素,所述n个子元素中的第i个子元素是根据G
d对应的矩阵W
2,d的n列中第i列的N个元素中幅度信息最大的元素确定的,n为正整数,i∈{1,2,...,n};
其中,G
u
T(l
u)=W
1×W
2,u(l
u),G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m}。
可选地,所述第一幅度信息是根据G
u的至少两个元素的幅度信息的平均值确定的,所述第二幅度信息是根据G
d的至少两个元素的幅度信息的平均值确定的;或
所述第一幅度信息是根据G
u对应的矩阵W
2,u的至少两个元素的幅度信息的平均值确定的,所述第二幅度信息是根据G
d对应的矩阵W
2,d的至少两个元素的幅度信息的平均值确定的,其中,G
u
T(l
u)=W
1×W
2,u(l
u),G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m}。
可选地,所述第一天线端口集合为预定义的、根据网络设备的配置确定的、或根据终端设备上报的终端能力确定的;和/或
所述第二天线端口集合为预定义的、根据网络设备的配置确定的、或根据终端设备上报的终端能力确定的。
可选地,所述第一天线端口集合和/或所述第二天线端口集合是通过以下信令中的至少一个中所携带的配置信息确定的:
无线资源控制RRC、多址接入控制MAC控制元素CE和下行控制信息DCI。
可选地,所述收发单元420还用于执行下列步骤中的至少一个:
接收第一参考信号,所述第一参考信号用于获得所述第一指示信息;发送所述第二天线端口集合的信道状态信息;通过所述第一天线端口集合发送第二参考信号。
可选地,所述第一参考信号为信道状态信息参考信号CSI-RS;和/或所述第二参考信号为探测参考信号SRS。
应理解,这里的装置400以功能单元的形式体现。这里的术语“单元”可以指应用特有集成电路(application specific integrated circuit,ASIC)、电子电路、用于执行一个或多个软件或固件程序的处理器(例如共享处理器、专有处理器或组处理器等)和存储器、合并逻辑电路和/或其它支持所描述的功能的合适组件。在一个可选例子中,本领域技术人员可以理解,装置400可以具体为上述实施例中的终端设备,装置400可以用于执行上述方法实施例中与终端设备对应的各个流程和/或步骤,为避免重复,在此不再赘述。
图5示出了本申请实施例提供的另一上报信道状态信息的装置500,该装置500可以是前述实施例中的网络设备,也可以为网络设备中的芯片。该装置500包括:
发送单元510,用于发送第一参考信号;
接收单元520,用于接收终端设备根据所述第一参考信号获得的第一指示信息,所述第一指示信息用于指示第一天线端口集合的信道状态信息与第二天线端口集合的信道状态信息之间的差分值,其中,所述第一天线端口集合包括所述终端设备的x个天线端口,所述第二天线端口集合包括所述终端设备的m个天线端口,所述第一天线端口集合和所述第二天线端口集合不同,x和m是正整数。
本申请实施例的上报信道状态信息的装置,通过终端设备上报两部分天线端口之间的信道状态信息的差分值,使得网络设备能够根据该差分值消除网络设备和终端设备的发送功率不同的影响,有利于提高网络设备所获取的信道状态信息的准确性,从而提高数据传输性能。
可选地,所述第一指示信息为宽带参数,或所述第一指示信息为子带参数。
可选地,所述第一天线端口集合的信道状态信息包括与所述第一天线端口集合的信道 矩阵G
u相关联的第一幅度信息;和/或
所述第二天线端口集合的信道状态信息包括与所述第二天线端口集合的信道矩阵G
d相关联的第二幅度信息;
其中,所述G
d是m行M列的矩阵,所述G
u是x行M列的矩阵,M是正整数。
可选地,所述第一幅度信息是根据下列任意一种元素确定的:G
u的至少一行元素中幅度信息取值最大的元素、G
u对应的矩阵W
2,u中至少一列元素中幅度信息取值最大的元素、G
u的至少一个奇异值中幅度信息取值最大的奇异值、G
u的至少一个特征值中幅度信息取值最大的特征值;和/或
所述第二幅度信息是根据下列任意一种元素确定的:G
d的至少一行元素中幅度信息取值最大的元素、G
d对应的矩阵W
2,d中至少一列元素中幅度信息取值最大的元素、G
d的至少一个特征值中幅度信息取值最大的特征值、G
d的至少一个奇异值中幅度信息取值最大的奇异值;
其中,G
u
T(l
u)=W
1×W
2,u(l
u),G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m}。
可选地,所述第一幅度信息是根据G
u的至少一行元素中幅度信息取值最大的元素确定的;
所述第二幅度信息包括n个子元素,所述n个子元素中的第i个子元素是根据G
d的n行中第i行的M个元素中幅度信息最大的元素确定的,n为正整数,i∈{1,2,...,n}。
可选地,所述第一幅度信息是根据G
u对应的矩阵W
2,u的至少一列元素中幅度信息取值最大的元素确定的;
所述第二幅度信息包括n个子元素,所述n个子元素中的第i个子元素是根据G
d对应的矩阵W
2,d的n列中第i列的N个元素中幅度信息最大的元素确定的,n为正整数,i∈{1,2,...,n};
其中,G
u
T(l
u)=W
1×W
2,u(l
u),G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m}。
可选地,所述第一幅度信息是根据G
u的至少两个元素的幅度信息的平均值确定的,所述第二幅度信息是根据G
d的至少两个元素的幅度信息的平均值确定的;或
所述第一幅度信息是根据G
u对应的矩阵W
2,u的至少两个元素的幅度信息的平均值确定的,所述第二幅度信息是根据G
d对应的矩阵W
2,d的至少两个元素的幅度信息的平均值确定的,其中,G
u
T(l
u)=W
1×W
2,u(l
u),G
d
T(l
d)=W
1×W
2,d(l
d),X
T表示矩阵X的转置,X(l
u)表示矩阵X的第l
u列,X(l
d)表示矩阵X的第l
d列,W
1为M*N的矩阵,W
2,u为N*x的矩阵,W
2,d为N*m的矩阵,N是正整数,l
u∈{1,2,...,x},l
d∈{1,2,...,m}。
可选地,所述第一天线端口集合为预定义的、根据网络设备的配置确定的、或根据终端设备上报的终端能力确定的;和/或
所述第二天线端口集合为预定义的、根据网络设备的配置确定的、或根据终端设备上报的终端能力确定的。
可选地,所述第一天线端口集合和/或所述第二天线端口集合是通过以下信令中的至 少一个中所携带的配置信息确定的:无线资源控制RRC、多址接入控制MAC控制元素CE和下行控制信息DCI。
可选地,所述接收单元520还用于执行下列步骤中的至少一个:接收所述第二天线端口集合的信道状态信息;接收通过所述终端设备通过所述第一天线端口集合发送的第二参考信号。
可选地,所述第一参考信号为信道状态信息参考信号CSI-RS;和/或所述第二参考信号为探测参考信号SRS。
应理解,这里的装置500以功能单元的形式体现。这里的术语“单元”可以指应用特有集成电路(application specific integrated circuit,ASIC)、电子电路、用于执行一个或多个软件或固件程序的处理器(例如共享处理器、专有处理器或组处理器等)和存储器、合并逻辑电路和/或其它支持所描述的功能的合适组件。在一个可选例子中,本领域技术人员可以理解,装置500可以具体为上述实施例中的网络设备,装置500可以用于执行上述方法实施例中与网络设备对应的各个流程和/或步骤,为避免重复,在此不再赘述。
上述各个方案的装置400和装置500具有实现上述方法中终端设备和网络设备执行的相应步骤的功能;所述功能可以通过硬件实现,也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块;例如发送单元可以由发射机替代,接收单元可以由接收机替代,其它单元,如确定单元等可以由处理器替代,分别执行各个方法实施例中的收发操作以及相关的处理操作。
在本申请的实施例,图4和图5中的装置也可以是芯片或者芯片***,例如:片上***(system on chip,SoC)。对应的,接收单元和发送单元可以是该芯片的收发电路,在此不做限定。
图6示出了本申请实施例提供的另一上报信道状态信息的装置600。该装置600包括处理器610、收发器620和存储器630。其中,处理器610、收发器620和存储器630通过内部连接通路互相通信,该存储器630用于存储指令,该处理器610用于执行该存储器630存储的指令,以控制该收发器620发送信号和/或接收信号。
其中,该处理器610用于获得第一指示信息,所述第一指示信息用于指示第一天线端口集合的信道状态信息与第二天线端口集合的信道状态信息之间的差分值,其中,所述第一天线端口集合包括所述装置的x个天线端口,所述第二天线端口集合包括所述装置的m个天线端口,所述第一天线端口集合和所述第二天线端口集合不同,x和m是正整数;该收发器620用于发送所述第一指示信息。
应理解,装置600可以具体为上述实施例中的终端设备,并且可以用于执行上述方法实施例中与终端设备对应的各个步骤和/或流程。可选地,该存储器630可以包括只读存储器和随机存取存储器,并向处理器提供指令和数据。存储器的一部分还可以包括非易失性随机存取存储器。例如,存储器还可以存储设备类型的信息。该处理器610可以用于执行存储器中存储的指令,并且当该处理器610执行存储器中存储的指令时,该处理器610用于执行上述与该终端设备对应的方法实施例的各个步骤和/或流程。
图7示出了本申请实施例提供的另一上报信道状态信息的装置700。该装置700包括处理器710、收发器720和存储器730。其中,处理器710、收发器720和存储器730通过内部连接通路互相通信,该存储器730用于存储指令,该处理器710用于执行该存储器 730存储的指令,以控制该收发器720发送信号和/或接收信号。
其中,该收发器720用于发送第一参考信号;接收终端设备根据所述第一参考信号获得的第一指示信息,所述第一指示信息用于指示第一天线端口集合的信道状态信息与第二天线端口集合的信道状态信息之间的差分值,其中,所述第一天线端口集合包括所述终端设备的x个天线端口,所述第二天线端口集合包括所述终端设备的m个天线端口,所述第一天线端口集合和所述第二天线端口集合不同,x和m是正整数。
应理解,装置700可以具体为上述实施例中的网络设备,并且可以用于执行上述方法实施例中网络设备对应的各个步骤和/或流程。可选地,该存储器730可以包括只读存储器和随机存取存储器,并向处理器提供指令和数据。存储器的一部分还可以包括非易失性随机存取存储器。例如,存储器还可以存储设备类型的信息。该处理器710可以用于执行存储器中存储的指令,并且当该处理器710执行存储器中存储的指令时,该处理器610用于执行上述与该网络设备对应的方法实施例的各个步骤和/或流程。
应理解,在本申请实施例中,上述装置的处理器可以是中央处理单元(central processing unit,CPU),该处理器还可以是其他通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
在实现过程中,上述方法的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成,或者用处理器中的硬件及软件单元组合执行完成。软件单元可以位于随机存储器,闪存、只读存储器,可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器,处理器执行存储器中的指令,结合其硬件完成上述方法的步骤。为避免重复,这里不再详细描述。
应理解,本文中术语“和/或”,仅仅是一种描述关联对象的关联关系,表示可以存在三种关系,例如,A和/或B,可以表示:单独存在A,同时存在A和B,单独存在B这三种情况。另外,本文中字符“/”,一般表示前后关联对象是一种“或”的关系。
本领域普通技术人员可以意识到,结合本文中所公开的实施例中描述的各方法步骤和单元,能够以电子硬件、计算机软件或者二者的结合来实现,为了清楚地说明硬件和软件的可互换性,在上述说明中已经按照功能一般性地描述了各实施例的步骤及组成。这些功能究竟以硬件还是软件方式来执行,取决于技术方案的特定应用和设计约束条件。本领域普通技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能,但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到,为了描述的方便和简洁,上述描述的***、装置和单元的具体工作过程,可以参考前述方法实施例中的对应过程,在此不再赘述。
在本申请所提供的几个实施例中,应该理解到,所揭露的***、装置和方法,可以通过其它的方式实现。例如,以上所描述的装置实施例仅仅是示意性的,例如,所述单元的划分,仅仅为一种逻辑功能划分,实际实现时可以有另外的划分方式,例如多个单元或组件可以结合或者可以集成到另一个***,或一些特征可以忽略,或不执行。另外,所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口、装置或单元的间接 耦合或通信连接,也可以是电的,机械的或其它的形式连接。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的,作为单元显示的部件可以是或者也可以不是物理单元,即可以位于一个地方,或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本申请实施例方案的目的。
另外,在本申请各个实施例中的各功能单元可以集成在一个处理单元中,也可以是各个单元单独物理存在,也可以是两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现,也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时,可以存储在一个计算机可读取存储介质中。基于这样的理解,本申请的技术方案本质上或者说对现有技术做出贡献的部分,或者该技术方案的全部或部分可以以软件产品的形式体现出来,该计算机软件产品存储在一个存储介质中,包括若干指令用以使得一台计算机设备(可以是个人计算机,服务器,或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括:U盘、移动硬盘、只读存储器(read-only memory,ROM)、随机存取存储器(random access memory,RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述,仅为本申请的具体实施方式,但本申请的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本申请揭露的技术范围内,可轻易想到各种等效的修改或替换,这些修改或替换都应涵盖在本申请的保护范围之内。因此,本申请的保护范围应以权利要求的保护范围为准。
Claims (43)
- 一种上报信道状态信息的方法,其特征在于,包括:终端设备获得第一指示信息,所述第一指示信息用于指示第一天线端口集合的信道状态信息与第二天线端口集合的信道状态信息之间的差分值,其中,所述第一天线端口集合包括所述终端设备的x个天线端口,所述第二天线端口集合包括所述终端设备的m个天线端口,所述第一天线端口集合和所述第二天线端口集合不同,x和m是正整数;所述终端设备发送所述第一指示信息。
- 根据权利要求1所述的方法,其特征在于,所述第一指示信息为宽带参数,或所述第一指示信息为子带参数。
- 根据权利要求1或2所述的方法,其特征在于,所述第一天线端口集合的信道状态信息包括与所述第一天线端口集合的信道矩阵G u相关联的第一幅度信息;和/或所述第二天线端口集合的信道状态信息包括与所述第二天线端口集合的信道矩阵G d相关联的第二幅度信息;其中,G d是m行M列的矩阵,G u是x行M列的矩阵,M是正整数。
- 根据权利要求3所述的方法,其特征在于,所述第一幅度信息是根据下列任意一种元素确定的:G u的至少一行元素中幅度信息取值最大的元素、G u对应的矩阵W 2,u中至少一列元素中幅度信息取值最大的元素、G u的至少一个奇异值中幅度信息取值最大的奇异值、G u的至少一个特征值中幅度信息取值最大的特征值;和/或所述第二幅度信息是根据下列任意一种元素确定的:G d的至少一行元素中幅度信息取值最大的元素、G d对应的矩阵W 2,d中至少一列元素中幅度信息取值最大的元素、G d的至少一个特征值中幅度信息取值最大的特征值、G d的至少一个奇异值中幅度信息取值最大的奇异值;其中,G u T(l u)=W 1×W 2,u(l u),G d T(l d)=W 1×W 2,d(l d),X T表示矩阵X的转置,X(l u)表示矩阵X的第l u列,X(l d)表示矩阵X的第l d列,W 1为M*N的矩阵,W 2,u为N*x的矩阵,W 2,d为N*m的矩阵,N是正整数,l u∈{1,2,...,x},l d∈{1,2,...,m}。
- 根据权利要求3所述的方法,其特征在于,所述第一幅度信息是根据G u的至少一行元素中幅度信息取值最大的元素确定的;所述第二幅度信息包括n个子元素,所述n个子元素中的第i个子元素是根据G d的n行中第i行的M个元素中幅度信息最大的元素确定的,n为正整数,i∈{1,2,...,n}。
- 根据权利要求3所述的方法,其特征在于,所述第一幅度信息是根据G u对应的矩阵W 2,u的至少一列元素中幅度信息取值最大的元素确定的;所述第二幅度信息包括n个子元素,所述n个子元素中的第i个子元素是根据G d对应的矩阵W 2,d的n列中第i列的N个元素中幅度信息最大的元素确定的,n为正整数,i∈{1,2,...,n};其中,G u T(l u)=W 1×W 2,u(l u),G d T(l d)=W 1×W 2,d(l d),X T表示矩阵X的转置,X(l u)表示矩阵X的第l u列,X(l d)表示矩阵X的第l d列,W 1为M*N的矩阵,W 2,u为N*x的矩 阵,W 2,d为N*m的矩阵,N是正整数,l u∈{1,2,...,x},l d∈{1,2,...,m}。
- 根据权利要求3所述的方法,其特征在于,所述第一幅度信息是根据G u的至少两个元素的幅度信息的平均值确定的,所述第二幅度信息是根据G d的至少两个元素的幅度信息的平均值确定的;或所述第一幅度信息是根据G u对应的矩阵W 2,u的至少两个元素的幅度信息的平均值确定的,所述第二幅度信息是根据G d对应的矩阵W 2,d的至少两个元素的幅度信息的平均值确定的,其中,G u T(l u)=W 1×W 2,u(l u),G d T(l d)=W 1×W 2,d(l d),X T表示矩阵X的转置,X(l u)表示矩阵X的第l u列,X(l d)表示矩阵X的第l d列,W 1为M*N的矩阵,W 2,u为N*x的矩阵,W 2,d为N*m的矩阵,N是正整数,l u∈{1,2,...,x},l d∈{1,2,...,m}。
- 根据权利要求1至7中任一项所述的方法,其特征在于,所述方法还包括下列步骤中的至少一个:所述终端设备接收第一参考信号,所述第一参考信号用于获得所述第一指示信息;所述终端设备发送所述第二天线端口集合的信道状态信息;所述终端设备通过所述第一天线端口集合发送第二参考信号。
- 根据权利要求8所述的方法,其特征在于,所述第一参考信号为信道状态信息参考信号CSI-RS;和/或所述第二参考信号为探测参考信号SRS。
- 一种芯片,其特征在于,包括:处理器,用于从存储器中调用并运行所述存储器中存储的指令,使得安装有所述芯片的通信设备执行如权利要求1至9中任一项所述的方法。
- 一种计算机可读存储介质,所述计算机可读存储介质存储有计算机程序,其特征在于,当所述计算机程序被计算机执行时,使得所述计算机实现如权利要求1至9中任一项所述的方法。
- 一种计算机程序产品,所述计算机程序产品中包含指令,其特征在于,当所述指令在计算机上运行时,使得计算机实现如权利要求1至9中任一项所述的方法。
- 一种上报信道状态信息的方法,其特征在于,包括:网络设备发送第一参考信号;网络设备接收终端设备根据所述第一参考信号获得的第一指示信息,所述第一指示信息用于指示第一天线端口集合的信道状态信息与第二天线端口集合的信道状态信息之间的差分值,其中,所述第一天线端口集合包括所述终端设备的x个天线端口,所述第二天线端口集合包括所述终端设备的m个天线端口,所述第一天线端口集合和所述第二天线端口集合不同,x和m是正整数。
- 根据权利要求13所述的方法,其特征在于,所述第一指示信息为宽带参数,或所述第一指示信息为子带参数。
- 根据权利要求13或14所述的方法,其特征在于,所述第一天线端口集合的信道状态信息包括与所述第一天线端口集合的信道矩阵G u相关联的第一幅度信息;和/或所述第二天线端口集合的信道状态信息包括与所述第二天线端口集合的信道矩阵G d相关联的第二幅度信息;其中,G d是m行M列的矩阵,G u是x行M列的矩阵,M是正整数。
- 根据权利要求15所述的方法,其特征在于,所述第一幅度信息是根据下列任意一种元素确定的:G u的至少一行元素中幅度信息取值最大的元素、G u对应的矩阵W 2,u中至少一列元素中幅度信息取值最大的元素、G u的至少一个奇异值中幅度信息取值最大的奇异值、G u的至少一个特征值中幅度信息取值最大的特征值;和/或所述第二幅度信息是根据下列任意一种元素确定的:G d的至少一行元素中幅度信息取值最大的元素、G d对应的矩阵W 2,d中至少一列元素中幅度信息取值最大的元素、G d的至少一个特征值中幅度信息取值最大的特征值、G d的至少一个奇异值中幅度信息取值最大的奇异值;其中,G u T(l u)=W 1×W 2,u(l u),G d T(l d)=W 1×W 2,d(l d),X T表示矩阵X的转置,X(l u)表示矩阵X的第l u列,X(l d)表示矩阵X的第l d列,W 1为M*N的矩阵,W 2,u为N*x的矩阵,W 2,d为N*m的矩阵,N是正整数,l u∈{1,2,...,x},l d∈{1,2,...,m}。
- 根据权利要求15所述的方法,其特征在于,所述第一幅度信息是根据G u的至少一行元素中幅度信息取值最大的元素确定的;所述第二幅度信息包括n个子元素,所述n个子元素中的第i个子元素是根据G d的n行中第i行的M个元素中幅度信息最大的元素确定的,n为正整数,i∈{1,2,...,n}。
- 根据权利要求15所述的方法,其特征在于,所述第一幅度信息是根据G u对应的矩阵W 2,u的至少一列元素中幅度信息取值最大的元素确定的;所述第二幅度信息包括n个子元素,所述n个子元素中的第i个子元素是根据G d对应的矩阵W 2,d的n列中第i列的N个元素中幅度信息最大的元素确定的,n为正整数,i∈{1,2,...,n};其中,G u T(l u)=W 1×W 2,u(l u),G d T(l d)=W 1×W 2,d(l d),X T表示矩阵X的转置,X(l u)表示矩阵X的第l u列,X(l d)表示矩阵X的第l d列,W 1为M*N的矩阵,W 2,u为N*x的矩阵,W 2,d为N*m的矩阵,N是正整数,l u∈{1,2,...,x},l d∈{1,2,...,m}。
- 根据权利要求15所述的方法,其特征在于,所述第一幅度信息是根据G u的至少两个元素的幅度信息的平均值确定的,所述第二幅度信息是根据G d的至少两个元素的幅度信息的平均值确定的;或所述第一幅度信息是根据G u对应的矩阵W 2,u的至少两个元素的幅度信息的平均值确定的,所述第二幅度信息是根据G d对应的矩阵W 2,d的至少两个元素的幅度信息的平均值确定的,其中,G u T(l u)=W 1×W 2,u(l u),G d T(l d)=W 1×W 2,d(l d),X T表示矩阵X的转置,X(l u)表示矩阵X的第l u列,X(l d)表示矩阵X的第l d列,W 1为M*N的矩阵,W 2,u为N*x的矩阵,W 2,d为N*m的矩阵,N是正整数,l u∈{1,2,...,x},l d∈{1,2,...,m}。
- 根据权利要求13至19中任一项所述的方法,其特征在于,所述方法还包括下列步骤中的至少一个:所述网络设备接收所述第二天线端口集合的信道状态信息;所述网络设备接收第二参考信号。
- 根据权利要求20所述的方法,其特征在于,所述第一参考信号为信道状态信息参考信号CSI-RS;和/或所述第二参考信号为探测参考信号SRS。
- 一种芯片,其特征在于,包括:处理器,用于从存储器中调用并运行所述存储器中存储的指令,使得安装有所述芯片的通信设备执行如权利要求13至21中任一项所述的方法。
- 一种计算机可读存储介质,所述计算机可读存储介质存储有计算机程序,其特征在于,当所述计算机程序被计算机执行时,使得所述计算机实现如权利要求13至21中任一项所述的方法。
- 一种计算机程序产品,所述计算机程序产品中包含指令,其特征在于,当所述指令在计算机上运行时,使得计算机实现如权利要求13至21中任一项所述的方法。
- 一种上报信道状态信息的装置,其特征在于,包括:获取单元,用于获得第一指示信息,所述第一指示信息用于指示第一天线端口集合的信道状态信息与第二天线端口集合的信道状态信息之间的差分值,其中,所述第一天线端口集合包括所述装置的x个天线端口,所述第二天线端口集合包括所述装置的m个天线端口,所述第一天线端口集合和所述第二天线端口集合不同,x和m是正整数;收发单元,用于发送所述第一指示信息。
- 根据权利要求25所述的装置,其特征在于,所述第一指示信息为宽带参数,或所述第一指示信息为子带参数。
- 根据权利要求25或26所述的装置,其特征在于,所述第一天线端口集合的信道状态信息包括与所述第一天线端口集合的信道矩阵G u相关联的第一幅度信息;和/或所述第二天线端口集合的信道状态信息包括与所述第二天线端口集合的信道矩阵G d相关联的第二幅度信息;其中,G d是m行M列的矩阵,G u是x行M列的矩阵,M是正整数。
- 根据权利要求27所述的装置,其特征在于,所述第一幅度信息是根据下列任意一种元素确定的:G u的至少一行元素中幅度信息取值最大的元素、G u对应的矩阵W 2,u中至少一列元素中幅度信息取值最大的元素、G u的至少一个奇异值中幅度信息取值最大的奇异值、G u的至少一个特征值中幅度信息取值最大的特征值;和/或所述第二幅度信息是根据下列任意一种元素确定的:G d的至少一行元素中幅度信息取值最大的元素、G d对应的矩阵W 2,d中至少一列元素中幅度信息取值最大的元素、G d的至少一个特征值中幅度信息取值最大的特征值、G d的至少一个奇异值中幅度信息取值最大的奇异值;其中,G u T(l u)=W 1×W 2,u(l u),G d T(l d)=W 1×W 2,d(l d),X T表示矩阵X的转置,X(l u)表示矩阵X的第l u列,X(l d)表示矩阵X的第l d列,W 1为M*N的矩阵,W 2,u为N*x的矩阵,W 2,d为N*m的矩阵,N是正整数,l u∈{1,2,...,x},l d∈{1,2,...,m}。
- 根据权利要求27所述的装置,其特征在于,所述第一幅度信息是根据G u的至少一行元素中幅度信息取值最大的元素确定的;所述第二幅度信息包括n个子元素,所述n个子元素中的第i个子元素是根据G d的n行中第i行的M个元素中幅度信息最大的元素确定的,n为正整数,i∈{1,2,...,n}。
- 根据权利要求27所述的装置,其特征在于,所述第一幅度信息是根据G u对应的矩阵W 2,u的至少一列元素中幅度信息取值最大的元素确定的;所述第二幅度信息包括n个子元素,所述n个子元素中的第i个子元素是根据G d对应的矩阵W 2,d的n列中第i列的N个元素中幅度信息最大的元素确定的,n为正整数,i∈{1,2,...,n};其中,G u T(l u)=W 1×W 2,u(l u),G d T(l d)=W 1×W 2,d(l d),X T表示矩阵X的转置,X(l u)表示矩阵X的第l u列,X(l d)表示矩阵X的第l d列,W 1为M*N的矩阵,W 2,u为N*x的矩阵,W 2,d为N*m的矩阵,N是正整数,l u∈{1,2,...,x},l d∈{1,2,...,m}。
- 根据权利要求27所述的装置,其特征在于,所述第一幅度信息是根据G u的至少两个元素的幅度信息的平均值确定的,所述第二幅度信息是根据G d的至少两个元素的幅度信息的平均值确定的;或所述第一幅度信息是根据G u对应的矩阵W 2,u的至少两个元素的幅度信息的平均值确定的,所述第二幅度信息是根据G d对应的矩阵W 2,d的至少两个元素的幅度信息的平均值确定的,其中,G u T(l u)=W 1×W 2,u(l u),G d T(l d)=W 1×W 2,d(l d),X T表示矩阵X的转置,X(l u)表示矩阵X的第l u列,X(l d)表示矩阵X的第l d列,W 1为M*N的矩阵,W 2,u为N*x的矩阵,W 2,d为N*m的矩阵,N是正整数,l u∈{1,2,...,x},l d∈{1,2,...,m}。
- 根据权利要求25至31中任一项所述的装置,其特征在于,所述收发单元还用于执行下列步骤中的至少一个:接收第一参考信号,所述第一参考信号用于获得所述第一指示信息;发送所述第二天线端口集合的信道状态信息;通过所述第一天线端口集合发送第二参考信号。
- 根据权利要求32所述的装置,其特征在于,所述第一参考信号为信道状态信息参考信号CSI-RS;和/或所述第二参考信号为探测参考信号SRS。
- 一种上报信道状态信息的装置,其特征在于,包括:发送单元,用于发送第一参考信号;接收单元,用于接收终端设备根据所述第一参考信号获得的第一指示信息,所述第一指示信息用于指示第一天线端口集合的信道状态信息与第二天线端口集合的信道状态信息之间的差分值,其中,所述第一天线端口集合包括所述终端设备的x个天线端口,所述第二天线端口集合包括所述终端设备的m个天线端口,所述第一天线端口集合和所述第二天线端口集合不同,x和m是正整数。
- 根据权利要求34所述的装置,其特征在于,所述第一指示信息为宽带参数,或所述第一指示信息为子带参数。
- 根据权利要求34或35所述的装置,其特征在于,所述第一天线端口集合的信道状态信息包括与所述第一天线端口集合的信道矩阵G u相关联的第一幅度信息;和/或所述第二天线端口集合的信道状态信息包括与所述第二天线端口集合的信道矩阵G d相关联的第二幅度信息;其中,G d是m行M列的矩阵,G u是x行M列的矩阵,M是正整数。
- 根据权利要求36所述的装置,其特征在于,所述第一幅度信息是根据下列任意一种元素确定的:G u的至少一行元素中幅度信息取值最大的元素、G u对应的矩阵W 2,u中至少一列元素 中幅度信息取值最大的元素、G u的至少一个奇异值中幅度信息取值最大的奇异值、G u的至少一个特征值中幅度信息取值最大的特征值;和/或所述第二幅度信息是根据下列任意一种元素确定的:G d的至少一行元素中幅度信息取值最大的元素、G d对应的矩阵W 2,d中至少一列元素中幅度信息取值最大的元素、G d的至少一个特征值中幅度信息取值最大的特征值、G d的至少一个奇异值中幅度信息取值最大的奇异值;其中,G u T(l u)=W 1×W 2,u(l u),G d T(l d)=W 1×W 2,d(l d),X T表示矩阵X的转置,X(l u)表示矩阵X的第l u列,X(l d)表示矩阵X的第l d列,W 1为M*N的矩阵,W 2,u为N*x的矩阵,W 2,d为N*m的矩阵,N是正整数,l u∈{1,2,...,x},l d∈{1,2,...,m}。
- 根据权利要求36所述的装置,其特征在于,所述第一幅度信息是根据G u的至少一行元素中幅度信息取值最大的元素确定的;所述第二幅度信息包括n个子元素,所述n个子元素中的第i个子元素是根据G d的n行中第i行的M个元素中幅度信息最大的元素确定的,n为正整数,i∈{1,2,...,n}。
- 根据权利要求36所述的装置,其特征在于,所述第一幅度信息是根据G u对应的矩阵W 2,u的至少一列元素中幅度信息取值最大的元素确定的;所述第二幅度信息包括n个子元素,所述n个子元素中的第i个子元素是根据G d对应的矩阵W 2,d的n列中第i列的N个元素中幅度信息最大的元素确定的,n为正整数,i∈{1,2,...,n};其中,G u T(l u)=W 1×W 2,u(l u),G d T(l d)=W 1×W 2,d(l d),X T表示矩阵X的转置,X(l u)表示矩阵X的第l u列,X(l d)表示矩阵X的第l d列,W 1为M*N的矩阵,W 2,u为N*x的矩阵,W 2,d为N*m的矩阵,N是正整数,l u∈{1,2,...,x},l d∈{1,2,...,m}。
- 根据权利要求36所述的装置,其特征在于,所述第一幅度信息是根据G u的至少两个元素的幅度信息的平均值确定的,所述第二幅度信息是根据G d的至少两个元素的幅度信息的平均值确定的;或所述第一幅度信息是根据G u对应的矩阵W 2,u的至少两个元素的幅度信息的平均值确定的,所述第二幅度信息是根据G d对应的矩阵W 2,d的至少两个元素的幅度信息的平均值确定的,其中,G u T(l u)=W 1×W 2,u(l u),G d T(l d)=W 1×W 2,d(l d),X T表示矩阵X的转置,X(l u)表示矩阵X的第l u列,X(l d)表示矩阵X的第l d列,W 1为M*N的矩阵,W 2,u为N*x的矩阵,W 2,d为N*m的矩阵,N是正整数,l u∈{1,2,...,x},l d∈{1,2,...,m}。
- 根据权利要求34至40中任一项所述的装置,其特征在于,所述接收单元还用于执行下列步骤中的至少一个:接收所述第二天线端口集合的信道状态信息;接收第二参考信号。
- 根据权利要求41所述的装置,其特征在于,所述第一参考信号为信道状态信息参考信号CSI-RS;和/或所述第二参考信号为探测参考信号SRS。
- 一种上报信道状态信息的***,其特征在于,包括权利要求25至33中任一项所述的装置和权利要求34至42中任一项所述的装置。
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