WO2016183803A1 - 天线阵列的信道信息反馈方法与装置 - Google Patents

天线阵列的信道信息反馈方法与装置 Download PDF

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WO2016183803A1
WO2016183803A1 PCT/CN2015/079290 CN2015079290W WO2016183803A1 WO 2016183803 A1 WO2016183803 A1 WO 2016183803A1 CN 2015079290 W CN2015079290 W CN 2015079290W WO 2016183803 A1 WO2016183803 A1 WO 2016183803A1
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Prior art keywords
network device
sub
subchannels
channel
antenna array
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PCT/CN2015/079290
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English (en)
French (fr)
Inventor
吴晔
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to EP20193940.2A priority Critical patent/EP3829072A1/en
Priority to CN201810399453.4A priority patent/CN108768481B/zh
Priority to KR1020177035783A priority patent/KR102132808B1/ko
Priority to JP2017560313A priority patent/JP6480018B2/ja
Priority to EP15892182.5A priority patent/EP3288189B1/en
Priority to PCT/CN2015/079290 priority patent/WO2016183803A1/zh
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN201580080197.7A priority patent/CN107615677B/zh
Publication of WO2016183803A1 publication Critical patent/WO2016183803A1/zh
Priority to US15/816,617 priority patent/US10320452B2/en
Anticipated expiration legal-status Critical
Priority to US16/408,133 priority patent/US10715221B2/en
Ceased legal-status Critical Current

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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0473—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking constraints in layer or codeword to antenna mapping into account
    • H—ELECTRICITY
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    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0478—Special codebook structures directed to feedback optimisation
    • H04B7/0479—Special codebook structures directed to feedback optimisation for multi-dimensional arrays, e.g. horizontal or vertical pre-distortion matrix index [PMI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—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
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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
    • H04B7/06—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
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—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
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/0874—Hybrid systems, i.e. switching and combining using subgroups of receive antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver

Definitions

  • Embodiments of the present invention relate to the field of communications, and in particular, to a channel information feedback method and apparatus for an antenna array.
  • LTE Long Term Evolution
  • UEs User Equipments
  • the increase in the number of antennas can provide a higher degree of spatial freedom, thereby multiplexing multiple data streams for the downlink space (such as single-user multiple input multiple output technology (English name: Signal-User Multiple-Input Multiple-Output, English abbreviation: SU -MIMO) or multi-user multiple-input multiple-output (English name: MU-MIMO) to create favorable conditions.
  • SU -MIMO Signal-User Multiple-Input Multiple-Output
  • MU-MIMO multi-user multiple-input multiple-output
  • CSI Downlink channel state information
  • the use of measurements is divided into two categories: one is to obtain instantaneous CSI, such as the channel itself; the other is to obtain statistical CSI, such as the autocorrelation matrix of the channel.
  • the role of large-scale antenna systems is more statistically significant.
  • the processing of the channel is performed, including dimensionality reduction, and Grid of Beamforming (GOB).
  • the acquisition of CSI mainly relies on downlink measurement and user equipment (English name: User equipment, English abbreviation: UE) feedback.
  • the UE obtains spatial precoding according to the downlink channel information and quantizes it according to a predetermined precoding codebook, and then feeds back to the base station.
  • the number of antennas in existing systems is small, and the complexity of acquiring spatial precoding is acceptable.
  • the antenna data is increased to several tens or even higher. Since the precoding needs to perform eigenvalue decomposition on the channel matrix or the autocorrelation matrix of the channel, the complexity of obtaining spatial precoding is too high, resulting in high complexity. The complexity of acquiring channel information is too high. Therefore, how to reduce the complexity of acquiring channel information has become an urgent problem to be solved.
  • Embodiments of the present invention provide a channel information feedback method and apparatus for an antenna array, which are used to reduce the complexity of acquiring channel information of an antenna array between different network devices.
  • an embodiment of the present invention provides a channel information feedback method for an antenna array, where include:
  • the first network device receives channel information of the N ⁇ M subchannels sent by the second network device, where the antenna array of the first network device includes M sub-arrays, and the antenna array of the second network device includes N sub-arrays
  • the channel between the antenna array of the first network device and the antenna array of the second network device includes the N ⁇ M subchannels, where M and N are positive integers and are not equal to 1, the M Included in the sub-array and the N sub-arrays; at least two antennas;
  • the channel information of the N ⁇ M subchannels includes a rank indication RI and a precoding matrix indication PMI, and each of the N ⁇ M subchannels corresponds to one subchannel.
  • the subchannel matrix, the channel information of the N ⁇ M subchannels is obtained according to the following steps:
  • the channel information of the N ⁇ M subchannels includes precoding, and each of the N ⁇ M subchannels corresponds to one subchannel matrix, and the N The channel information of the ⁇ M subchannels is obtained according to the following steps:
  • Precoding of N ⁇ M subchannels is obtained according to an autocorrelation matrix of a channel matrix of the N ⁇ M subchannels.
  • the channel information feedback method of the antenna array further includes:
  • the first network device sends the sub-array configuration information to the second network device, where the sub-array configuration information is used to divide the antenna array of the first network device into M sub-arrays, where M is greater than or equal to A positive integer of 2.
  • the sub-array configuration information includes at least one pattern, the M sub-arrays according to the at least one A pattern is determined.
  • the first species in the first aspect is in an implementation manner, the sub-array configuration information includes a starting port number of each sub-array, and each of the M sub-arrays is determined according to the starting port number.
  • the sub-array configuration information is a physical downlink common control channel PDCCH, a radio link layer control protocol RLC signaling or physical broadcast channel PBCH transmission.
  • an embodiment of the present invention further provides a channel information feedback method for an antenna array, including:
  • the second network device generates channel information of N ⁇ M subchannels of a channel between the antenna array of the first network device and the antenna array of the second network device, where the antenna array of the first network device includes M sub-
  • the antenna array of the second network device includes N sub-arrays, where M and N are positive integers and are not equal to 1, and the M sub-arrays and the N sub-arrays include at least two antennas;
  • the channel information is a rank indication RI and a precoding matrix indication PMI, and each of the N ⁇ M subchannels corresponds to one subchannel matrix, where the N ⁇
  • the channel information of the M subchannels is obtained according to the following steps:
  • the channel information of the N ⁇ M subchannels includes precoding, and each of the N ⁇ M subchannels corresponds to one subchannel matrix, and the second network
  • the channel information of the N ⁇ M subchannels of the channel between the antenna array of the first network device and the antenna array of the second network device is specifically included:
  • Precoding of N ⁇ M subchannels is obtained according to an autocorrelation matrix of a channel matrix of the N ⁇ M subchannels.
  • the method further includes:
  • the second network device receives the sub-array configuration information sent by the first network device, where the sub-array configuration information is used to divide the antenna array of the first network device into M sub-arrays, where M Is a positive integer greater than 2.
  • the sub-array configuration information includes at least one pattern, the N sub-arrays according to the at least one pattern determine.
  • the sub-array configuration information includes a start port number of each sub-array, and the M sub-arrays are configured according to The starting port number of each sub-array is determined.
  • the sub-array configuration information is a physical downlink common control channel PDCCH, a radio link layer control protocol RLC letter Let the physical broadcast channel PBCH be sent.
  • an embodiment of the present invention provides an apparatus for channel information feedback of an antenna array, including:
  • a receiving module configured to receive channel information of the N ⁇ M subchannels sent by the second network device, where an antenna array of the first network device includes M sub-arrays, and an antenna array of the second network device includes N sub-arrays, the channel between the antenna array of the first network device and the antenna array of the second network device includes the N ⁇ M subchannels, and the M and N are positive integers and are not equal to 1,
  • the M sub-arrays and the N sub-arrays include at least two antennas;
  • a processing module configured to generate, according to channel information of the N ⁇ M subchannels from the receiving module, a channel of a channel between an antenna array of the first network device and an antenna array of the second network device information.
  • the sending module is configured to send sub-array configuration information to the second network device, where the sub-array configuration information is used to use the first network device
  • the antenna array is divided into M sub-arrays, where M is a positive integer greater than or equal to 2.
  • the sub-array configuration information includes at least one pattern, the M sub-arrays according to the at least one The pattern is determined.
  • the sub-array configuration information includes a start port number of each sub-array, and the M sub-subs The array is determined according to the starting port number of each subarray.
  • the sub-array configuration information passes the physical downlink common control channel PDCCH, Line link layer control protocol RLC signaling or physical broadcast channel PBCH transmission.
  • an embodiment of the present invention provides a channel information feedback apparatus for an antenna array, where the channel information feedback apparatus includes:
  • a processing module configured to generate channel information of N ⁇ M subchannels of a channel between an antenna array of the first network device and an antenna array of the second network device, where the antenna array of the first network device includes M a sub-array, the antenna array of the second network device includes N sub-arrays, the M and N are positive integers and are not equal to 1, the M sub-arrays and the N sub-arrays include at least two antennas;
  • a sending module configured to send channel information of the N ⁇ M subchannels to the first network device, so that the first network device generates the first network device according to channel information of the N ⁇ M subchannels Channel information of the channel between the antenna array and the antenna array of the second network device.
  • the channel information is a rank indication RI and a precoding matrix indication PMI, and each of the N ⁇ M subchannels corresponds to one subchannel matrix, and the processing module Specifically used for:
  • the channel information of the N ⁇ M subchannels is a rank indication RI and a precoding matrix indication PMI, and each subchannel of the N ⁇ M subchannels corresponds to one subchannel.
  • the processing module is specifically configured to:
  • the channel information feedback apparatus for the antenna array further includes:
  • a receiving module configured to receive sub-array configuration information sent by the first network device, where the sub-array configuration information is used to divide an antenna array of the first network device into M sub-arrays, where M is greater than or equal to A positive integer of 2.
  • the sub-array configuration information includes at least one pattern, the N sub-arrays according to the One less pattern is determined.
  • the sub-array configuration information includes a starting port number of each sub-array, and the M sub-array according to the The starting port number of each subarray is determined.
  • the sub-array configuration information is performed by a physical downlink common control channel PDCCH, a radio link layer control protocol, and an RLC signaling Or the physical broadcast channel PBCH is transmitted.
  • the antenna array of the first network device and the antenna array of the second network device by grouping the antenna array of the first network device and the antenna array of the second network device, forming a plurality of antenna sub-arrays and acquiring the first network device antenna array corresponding to the plurality of antenna sub-arrays Acquiring a plurality of subchannel channel information between the antenna arrays of the second network device, and acquiring channel information between the antenna arrays of the first network device and the antenna arrays of the second network device according to the plurality of subchannel information, thereby reducing the complexity of acquiring channel information and improving The efficiency of channel information feedback.
  • FIG. 1 is a schematic flowchart diagram of a channel information feedback method of an antenna array according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of an antenna array grouping in the embodiment shown in FIG. 1 of the present invention.
  • FIG. 3 is a schematic flowchart diagram of a channel information feedback method of an antenna array according to another embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a channel information feedback apparatus for an antenna array according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a channel information feedback apparatus for an antenna array according to another embodiment of the present invention.
  • An antenna is an electronic device used to transmit or receive radio waves or electromagnetic waves. Physically, an antenna is a combination of one or more conductors that can generate a radiated electromagnetic field due to an applied alternating voltage and associated alternating current, or can be placed in an electromagnetic wave due to field sensing. An alternating current is generated inside the antenna and an alternating voltage is generated at its terminal. It refers to the frequency bandwidth of the antenna operating range it effectively.
  • the directionality of a single antenna is limited. For applications suitable for various occasions, two or more single antennas operating at the same frequency are fed and spatially arranged according to certain requirements to form an antenna array, also called an antenna array. .
  • the antenna radiating elements constituting the antenna array are called array elements.
  • the working principle of the antenna array can be regarded as the superposition of electromagnetic waves.
  • the electromagnetic waves will generate a vector superposition.
  • the result of the superposition is related not only to the magnitude of the amplitude of the electromagnetic waves of each column but also to the phase difference between them in the encountering interval.
  • the spatial phase difference caused by the electromagnetic waves emitted by the transmitting antennas located at different positions to the same receiving area will inevitably cause the following two situations in the series of electromagnetic waves: in-phase superposition, total field strength enhancement; anti-phase superposition
  • the total field strength is weakened. If the total field strength enhancement and the weakened area remain relatively fixed in space, it is equivalent to changing the radiation field structure of a single antenna with an antenna array, that is, the antenna array changes the principle of the radiation field size and directivity.
  • channel state information (CSI) measurements may be measured by instantaneous CSI, such as the measurement channel itself; or may be measured statistical CSI, such as the autocorrelation matrix of the measurement channel.
  • CSI channel state information
  • the measurement is more statistically processed for the channel, including dimensionality reduction, and Grid of Beamforming (GOB).
  • GOB Grid of Beamforming
  • CSI is acquired mainly through downlink measurement and user equipment (User Equipment, UE) feedback obtained.
  • UE User Equipment
  • RI Rank indicator
  • PMI Precoding matrix indicator
  • the UE obtains a Rank indicator (RI) and a spatial precoding indication (English name: Precoding matrix indicator, PMI) according to the channel information measured by the downlink, and quantizes it according to a predetermined precoding codebook, and then feeds back to the base station. Determine the precoding matrix.
  • the base station After receiving the RI and the PMI, the base station sends the data and the Cell Specific Reference Signal (CRS) or the Demodulation Reference Symbol (DM-RS) for demodulation.
  • CRS Cell Specific Reference Signal
  • DM-RS Demodulation Reference Symbol
  • a channel feedback method for an antenna array for acquiring channel information of a channel between an antenna array of a first network device and an antenna array of a second network device.
  • the first network device may be a network device of various forms, such as a macro base station, a micro base station, or a user equipment, and the antenna array includes M sub-arrays.
  • the second network device may be a user device, such as a portable device such as a mobile phone or a tablet computer. With the development of the Internet of Things in the future, the second network device may also be a terminal having an antenna, such as a smart refrigerator, a smart TV, or the like.
  • an implementation process of a channel feedback method for an antenna array in an embodiment of the present invention includes:
  • the second network device generates channel information of N ⁇ M subchannels between the antenna array of the first network device and the antenna array of the second network device.
  • the antenna array of the first network device includes M sub-arrays
  • the antenna array of the second network device includes N sub-arrays
  • M and N are positive integers and are not equal to 1
  • M sub-arrays and N sub-arrays include at least two antennas.
  • a typical antenna array contains the same number of antenna sub-arrays and is symmetrical.
  • the antenna array of the first network device it is assumed that the antenna array includes 36 antennas, and the antenna array of the first network device is divided into four sub-arrays, each sub-array includes 8 antennas, and 4
  • the sub-array is symmetrically set. It can be understood that the configured rules are not limited thereto. In other embodiments, the number of antennas included in each sub-array may be different or may be asymmetrically set.
  • the antenna array of the first network device and the antenna array of the second network device include N ⁇ M subchannels.
  • the channel information of the N ⁇ M subchannels between the antenna array of the first network device and the antenna array of the second network device includes a rank indicator RI and a precoding matrix indication PMI, or is precoding.
  • the second network device may obtain channel information of the N ⁇ M subchannels in response to a reference signal (RS) from the first network device, or may acquire channel information of the N ⁇ M subchannels according to channel reciprocity.
  • RS reference signal
  • the channels between the first network device and the second network device are grouped according to predetermined sub-array configuration information to obtain K sub-channels:
  • H (H 1 ,H 2 ,...,H k ,...H K )
  • H k dimension is L ⁇ M k
  • M k is the number of antenna ports of the kth antenna group.
  • the RI k and PMI k of the K subchannels are obtained from the autocorrelation matrix of the channel matrix of the K subchannels.
  • the steps of obtaining the RI and PMI of the K subchannels include:
  • the second network device acquires an autocorrelation matrix of the K subchannels according to the K subchannels
  • the eigenvalue decomposition (Eigenvalue decomposition, English abbreviation: EVD) or singular value decomposition (English full name: SVD) is performed on the autocorrelation matrix corresponding to the K subchannels to obtain the corresponding precoding U k .
  • the second network device may feed back the K subchannels corresponding precoding U k to the first network device.
  • the codebook corresponding to U k is quantized, and RI k and PMI k of the K subchannels are respectively obtained and fed back to the first network device.
  • the dimension of each codeword in the precoding codebook used by the first network device and the second network device is Mk ⁇ r, where Mk is the number of antenna ports of the kth antenna group, and r is the number of streams.
  • the second network device sends channel information of the N ⁇ M subchannels between the antenna array of the first network device and the antenna array of the second network device to the first network device.
  • the first network device receives channel information of N ⁇ M subchannels between an antenna array of the first network device of the second network device and an antenna array of the second network device.
  • the first network device generates, according to channel information of the N ⁇ M subchannels between the antenna array of the first network device of the second network device and the antenna array of the second network device, an antenna array of the first network device, and the Channel information of a channel between antenna arrays of the second network device.
  • the channel information of the N ⁇ M subchannels received by the first network device is the precoding U k
  • the first network device obtains the antenna array of the first network device according to the precoding U k of the K subchannels.
  • the precoding U of the channel between the antenna arrays of the two network devices is obtained according to the following expression:
  • the first network device quantizes the precoding U to obtain the RI and PMI of the channel between the antenna array of the first network device and the antenna array of the second network device.
  • the rank indicator RI k of the K subchannels is combined with the precoding indication PMI k , or through the capacity.
  • the maximization algorithm, or other algorithm obtains the RI and PMI of the channel between the antenna array of the first network device and the antenna array of the second network device.
  • the channel information feedback method for the antenna array further includes:
  • the first network device sends sub-array configuration information to the second network device, where the sub-array configuration information is used to divide the antenna array of the first network device into M sub-arrays, where M is a positive integer greater than 2.
  • step 100 is located before step 101, where the sub-array configuration information is used to preset an antenna array of the first network device.
  • the step 100 is located after the step 103, where the sub-array configuration information is used to dynamically update the antenna array of the first network device.
  • the first network device sends the sub-array configuration information to the second network device when transforming the antenna array.
  • the sub-array configuration information may be sent through a physical downlink control channel (English full name: Physical Downlink Control Channel, English abbreviation: PDCCH) or a radio link layer control protocol (Radio Link Control, English abbreviation: RLC), or broadcast signaling ( English full name: Physical broadcast channel, English abbreviation: PBCH) implementation.
  • the sub-array configuration information includes a sub-array grouping rule, The antenna array grouping of a network device is divided according to a preset rule included in the sub-array configuration information.
  • the preset rules are further numbered. In this manner, the first network device notifies the preset rule adopted by the second network device by sending the number.
  • the preset rule includes at least one pattern, and N sub-arrays of the antenna array of the second network device are determined according to the at least one pattern.
  • Figure 2 which can be used as a As an example of a pattern, the antenna array of the first network device is divided into four sub-arrays.
  • the preset rule is a start port number of each sub-array, and each of the N sub-arrays of the antenna array of the first network device is determined according to the start port number.
  • the antenna array of the first network device and the antenna array of the second network device by grouping the antenna array of the first network device and the antenna array of the second network device, forming a plurality of antenna sub-arrays and acquiring the first network device antenna array corresponding to the plurality of antenna sub-arrays Acquiring a plurality of subchannel channel information between the antenna arrays of the second network device, and acquiring channel information between the antenna arrays of the first network device and the antenna arrays of the second network device according to the plurality of subchannel information, thereby reducing the complexity of acquiring channel information and improving System efficiency.
  • Another embodiment of the present invention further provides an apparatus for channel information feedback of an antenna array, which is applied to a first network device for performing steps 103 and 104.
  • the apparatus 200 for channel information feedback of an antenna array includes a receiving module 210 and a processing module 220.
  • the receiving module 210 is configured to receive channel information of the N ⁇ M subchannels sent by the second network device.
  • the antenna array of the first network device includes M sub-arrays
  • the antenna array of the second network device includes N sub-arrays
  • the channel between the antenna array of the first network device and the antenna array of the second network device includes N ⁇ M sub-channels.
  • the channel, M and N are positive integers and are not equal to 1, and M sub-arrays and N sub-arrays include at least two antennas.
  • the processing module 220 is configured to generate, between the antenna array of the first network device and the antenna array of the second network device, according to channel information of the N ⁇ M subchannels from the receiving module. Channel information of the channel.
  • the subchannel information of the N ⁇ M subchannels includes a rank indication RI and a precoding matrix indication PMI.
  • the apparatus for channel information feedback of the antenna array is further configured to perform the above step 100.
  • the apparatus 200 further includes a sending module 230.
  • the sending module 230 is configured to send the sub-array configuration information to the first network device, where the sub-array configuration information is used to divide the antenna array of the first network device into M sub-arrays, where M is greater than or equal to A positive integer of 2.
  • the sub-array configuration information may be sent by the sending module 230 through the PDCCH, or may be sent through the RLC signaling, or may be sent through the PBCH.
  • the subarray configuration information includes at least one pattern, and the M subarrays of the array antennas of the first network device are determined according to the at least one pattern.
  • the sub-array configuration information includes a starting port number of each sub-array, the first network device
  • the M subarrays of the array antenna are determined according to the starting port number of each of the subarrays.
  • Another embodiment of the present invention further provides an apparatus for channel information feedback of an antenna array, which is applied to a second network device for performing steps 101 and 102.
  • the apparatus 300 for channel information feedback of an antenna array includes a processing module 310 and a transmitting module 320.
  • the processing module 310 is configured to generate channel information of N ⁇ M subchannels of a channel between the antenna array of the first network device and the antenna array of the second network device.
  • the antenna array of the first network device includes M sub-arrays
  • the antenna array of the second network device includes N sub-arrays
  • M and N are positive integers and are not equal to 1
  • M sub-arrays and N sub-arrays include at least two antenna.
  • the channel information of the N ⁇ M subchannels between the antenna array of the first network device and the antenna array of the second network device includes a rank indicator RI and a precoding matrix indication PMI.
  • the processing module 310 may obtain channel information of the N ⁇ M subchannels in response to a reference signal (RS) from the first network device, or may acquire channel information of the N ⁇ M subchannels according to channel reciprocity.
  • RS reference signal
  • the sending module 320 is configured to send channel information of the N ⁇ M subchannels to the first network device, so that the first network device generates the antenna array of the first network device and the second network device according to the channel information of the N ⁇ M subchannels. Channel information of the channel between the antenna arrays.
  • the apparatus 300 for channel information feedback of the antenna array includes a receiving module 330.
  • the receiving module 330 is configured to receive the sub-array configuration information that is sent by the first network device, where the sub-array configuration information is used to divide the antenna array of the first network device into M sub-arrays, where M is greater than 2. Positive integer.
  • the sub-array configuration information may be received by the receiving module 330 through the PDCCH, or may be obtained by receiving RLC signaling, or may be received through the PBCH.
  • the subarray configuration information includes at least one pattern, and the M subarrays of the array antennas of the first network device are determined according to the at least one pattern.
  • the sub-array configuration information includes a starting port number of each sub-array, and the M sub-arrays of the array antennas of the first network device are determined according to the starting port number of each sub-array.
  • each module in each embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules.
  • the steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented as hardware code processor execution completion, or combined with hardware and software modules in the code processor. The execution is complete.
  • the software module can be located in a random access memory, a flash memory, a read only memory, a programmable read only memory, or an electrically erasable programmable memory, a register, or the like.
  • the above-mentioned module or the integrated module can be an integrated circuit (IC), an application specific integrated circuit (ASIC), or a field-programmable gate array (FPGA). Etc., it can also be integrated in a baseband processor or a general purpose processor.
  • IC integrated circuit
  • ASIC application specific integrated circuit
  • FPGA field-programmable gate array
  • the above modules or integrated modules may be stored in a computer readable storage medium if they are implemented in the form of software functional modules and sold or used as separate products. Based on such understanding, the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of the various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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Abstract

本发明实施方式公开了一种天线阵列的信道信息反馈方法，包括：第一网络设备接收第二网络设备发送的N×M个子信道的信道信息，其中第一网络设备的天线阵列包括M个子阵，第二网络设备的天线阵列包括N个子阵，第一网络设备的天线阵列与第二网络设备的天线阵列之间的信道包括N×M个子信道，M和N为正整数且不同时为1，M个子阵和N个子阵中包括至少两根天线；根据来自第二网络设备的N×M个子信道的信道信息生成第一网络设备的天线阵列与第二网络设备的天线阵列之间的信道的信道信息。相较于现有技术，本发明实施方式公开的天线阵列之间的信道信息反馈方法，能够降低获取信道信息的复杂度，提升信道信息反馈的效率。

Description

天线阵列的信道信息反馈方法与装置 技术领域
本发明实施方式涉及通信领域，更具体地，涉及一种天线阵列的信道信息反馈方法与装置。
背景技术
在长期演进(Long Term Evolution，LTE)系统及其后续演进中，数据发射端的天线数量持续快速地增长，同时需要服务的用户设备(User equimen,UE)数量也快速地增长。天线数量的增长可以提供更高的空间自由度，从而为下行空间复用多个数据流(如单用户多入多出技术(英文全称：Signal-User Multiple-Input Multiple-Output，英文缩写：SU-MIMO)或者多用户多入多出技术(英文全称：Multi-User Multiple-Input Multiple-Output，英文缩写：MU-MIMO)创造有利条件。对于下行信道状态信息(英文全称：Channel state information，英文缩写：CSI)测量的使用分为两类：一类是获取瞬时CSI，如信道本身；一类是获取统计CSI，如信道的自相关矩阵。对于大规模天线系统的作用更多地在于统计意义上进行信道的处理，包括降维，以及波速扫描(Grid of beamforming，GOB)。
典型的，在大规模天线进行信道测量时，CSI的获取主要依靠下行测量以及用户设备(英文全称：User equipment，英文缩写：UE)反馈。在现有技术下，UE根据下行的信道信息获得空间预编码并按预定的预编码码本加以量化后反馈给基站。不过，现有系统中天线数量较少，获取空间预编码的复杂度可以接受。而在MU-MIMO场景下，天线数据增加到几十个甚至更高，由于获取预编码需要对信道矩阵或者信道的自相关矩阵进行特征值分解，如此获取空间预编码的复杂度过高，导致获取信道信息的复杂度过高。因此，如何降低获取信道信息的复杂度成为了亟待解决的问题。
发明内容
本发明实施方式提供一种天线阵列的信道信息反馈方法与装置，用于降低获取不同网络设备之间天线阵列的信道信息的复杂度。
第一方面，本发明实施方式提出一种天线阵列的信道信息反馈方法，包 括：
第一网络设备接收第二网络设备发送的所述N×M个子信道的信道信息，其中所述第一网络设备的天线阵列包括M个子阵，所述第二网络设备的天线阵列包括N个子阵，所述第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道包括所述N×M个子信道，所述M和N为正整数且不同时为1，所述M个子阵和所述N个子阵中包括至少两根天线；
根据来自第二网络设备的所述N×M个子信道的信道信息生成所述第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道的信道信息。
在所述第一方面的第一种可能的实施方式中，所述N×M个子信道的信道信息包括秩指示RI与预编码矩阵指示PMI，所述N×M个子信道中每个子信道对应一个子信道矩阵，所述N×M个子信道的信道信息根据以下步骤获得：
获取N×M个子信道对应的子信道矩阵的自相关矩阵；
根据所述N×M个子信道的信道矩阵的自相关矩阵获得N×M个子信道的RI与PMI。
在所述第一方面的第二种可能的实施方式中，所述N×M个子信道的信道信息包括预编码，所述N×M个子信道中每个子信道对应一个子信道矩阵，所述N×M个子信道的信道信息根据以下步骤获得：
获取N×M个子信道对应的子信道矩阵的自相关矩阵；
根据所述N×M个子信道的信道矩阵的自相关矩阵获得N×M个子信道的预编码。
在所述第一方面的第三种可能的实施方式中，天线阵列的信道信息反馈方法还包括：
所述第一网络设备向所述第二网络设备发送子阵配置信息，所述子阵配置信息用于将所述第一网络设备的天线阵列划分为M个子阵，其中，M为大于或者等于2的正整数。
结合所述第一方面的第三种可能的实施方式中，在第一方面的第四种可能的实施方式中，所述子阵配置信息包括至少一个图样，所述M个子阵根据所述至少一个图样确定。
结合所述第一方面的第三种可能的实施方式中，在第一方面的第无种可 能的实施方式中，所述子阵配置信息包括每个子阵的起始端口号，所述M个子阵中的每个子阵根据所述起始端口号确定。
结合所述第一方面的第三种可能的实施方式中，在第一方面的第六种可能的实施方式中，所述子阵配置信息通过物理下行公共控制信道PDCCH、无线链路层控制协议RLC信令或者物理广播信道PBCH发送。
第二方面，本发明实施方式还提出一种天线阵列的信道信息反馈方法，包括：
第二网络设备生成第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道的N×M个子信道的信道信息，其中，所述第一网络设备的天线阵列包括M个子阵，所述第二网络设备的天线阵列包括N个子阵，所述M和N为正整数且不同时为1，所述M个子阵和所述N个子阵中包括至少两根天线；
向所述第一网络设备发送所述N×M个子信道的信道信息，以使所述第一网络设备根据N×M个子信道的信道信息生成所述所述第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道的信道信息。
在第二方面的第一种可能的实施方式中，所述信道信息是秩指示RI与预编码矩阵指示PMI，所述N×M个子信道中每个子信道对应一个子信道矩阵，所述N×M个子信道的信道信息根据以下步骤获得：
获取N×M个子信道的信道矩阵的自相关矩阵；
根据所述N×M个子信道的信道矩阵的自相关矩阵获得N×M个子信道的RI与PMI。
在第二方面的第二种可能的实施方式中，所述N×M个子信道的信道信息包括预编码，所述N×M个子信道中每个子信道对应一个子信道矩阵，所述第二网络设备生成第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道的N×M个子信道的信道信息具体包括：
获取N×M个子信道的信道矩阵的自相关矩阵；
根据所述N×M个子信道的信道矩阵的自相关矩阵获得N×M个子信道的预编码。
在第二方面的第三种可能的实施方式中，所述方法还包括：
所述第二网络设备接收所述第一网络设备发送的子阵配置信息，所述子阵配置信息用于将所述第一网络设备的天线阵列划分为M个子阵，其中，M 为大于2的正整数。
结合第二方面的第三种可能的实施方式中，在第二方面的第四种可能的实施方式中，所述子阵配置信息包括至少一个图样，所述N个子阵根据所述至少一个图样确定。
结合第二方面的第三种可能的实施方式中，在第二方面的第五种可能的实施方式中，所述子阵配置信息包括每个子阵的起始端口号，所述M个子阵根据所述每个子阵的起始端口号确定。
结合第二方面的第三种可能的实施方式中，在第二方面的第六种可能的实施方式中，所述子阵配置信息通过物理下行公共控制信道PDCCH、无线链路层控制协议RLC信令或者物理广播信道PBCH发送。
第三方面，本发明实施方式提出一种用于天线阵列的信道信息反馈的装置，包括：
接收模块，用于接收所述第二网络设备发送的所述N×M个子信道的信道信息，其中所述第一网络设备的天线阵列包括M个子阵，所述第二网络设备的天线阵列包括N个子阵，所述第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道包括所述N×M个子信道，所述M和N为正整数且不同时为1，所述M个子阵和所述N个子阵中包括至少两根天线；
处理模块，用于根据来自所述接收模块的所述N×M个子信道的信道信息生成所述所述第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道的信道信息。
在所述第三方面的第一种可能的实施方式中，所述发送模块用于向所述第二网络设备发送子阵配置信息，所述子阵配置信息用于将所述第一网络设备的天线阵列划分为M个子阵，其中，M为大于或者等于2的正整数。
结合所述第三方面的第一种可能的实施方式，在第三方面的第二种可能的实施方式中，所述子阵配置信息包括至少一个图样，所述M个子阵根据所述至少一个图样确定。
结合所述第三方面的第一种可能的实施方式，在第三方面的第三种可能的实施方式中，所述子阵配置信息所包括每个子阵的起始端口号，所述M个子阵根据所述每个子阵的起始端口号确定。
结合所述第三方面的第一种可能的实施方式，在第三方面的第四种可能的实施方式中，所述子阵配置信息通过物理下行公共控制信道PDCCH、无 线链路层控制协议RLC信令或者物理广播信道PBCH发送。
第四方面，本发明实施方式提出一种用于天线阵列的信道信息反馈装置，所述信道信息反馈装置包括：
处理模块，用于生成第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道的N×M个子信道的信道信息，其中，所述第一网络设备的天线阵列包括M个子阵，所述第二网络设备的天线阵列包括N个子阵，所述M和N为正整数且不同时为1，所述M个子阵和所述N个子阵中包括至少两根天线；
发送模块，用于向所述第一网络设备发送所述N×M个子信道的信道信息，以使所述第一网络设备根据N×M个子信道的信道信息生成所述所述第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道的信道信息。
在第四方面的第一种可能的实施方式中，所述信道信息是秩指示RI与预编码矩阵指示PMI，所述N×M个子信道中每个子信道对应一个子信道矩阵，所述处理模块具体用于：
获取N×M个子信道的信道矩阵的自相关矩阵；
根据所述N×M个子信道的信道矩阵的自相关矩阵获得N×M个子信道的RI与PMI。
在第四方面的第二种可能的实施方式中，所述N×M个子信道的信道信息是秩指示RI与预编码矩阵指示PMI，所述N×M个子信道中每个子信道对应一个子信道矩阵，所述处理模块具体用于：
获取N×M个子信道的信道矩阵的自相关矩阵；
根据所述N×M个子信道的信道矩阵的自相关矩阵获得N×M个子信道的RI与PMI。
在第四方面的第三种可能的实施方式中，用于天线阵列的信道信息反馈装置还包括：
接收模块，用于接收所述第一网络设备发送的子阵配置信息，所述子阵配置信息用于将所述第一网络设备的天线阵列划分为M个子阵，其中，M为大于或者等于2的正整数。
结合第四方面的第三种可能的实施方式，在第四方面的第四种可能的实施方式中，所述子阵配置信息包括至少一个图样，所述N个子阵根据所述至 少一个图样确定。
结合第四方面的第三种可能的实施方式，在第四方面的第五种可能的实施方式中，所述子阵配置信息包括每个子阵的起始端口号，所述M个子阵根据所述每个子阵的起始端口号确定。
结合第四方面的第三种可能的实施方式，在第四方面的第六种可能的实施方式中，所述子阵配置信息通过物理下行公共控制信道PDCCH、无线链路层控制协议RLC信令或者物理广播信道PBCH发送。
在本实施方式中，通过对第一网络设备的天线阵列与第二网络设备的天线阵列进行分组，形成多个天线子阵并获取与对多个天线子阵对应的第一网络设备天线阵列与第二网络设备天线阵列之间多个子信道信道信息，并根据多个子信道信息获取第一网络设备天线阵列与第二网络设备天线阵列之间的信道信息，降低了获取信道信息的复杂度，提升了信道信息反馈的效率。
附图说明
为了更清楚地说明本发明实施方式的技术方案，下面将对实施方式或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明一种实施方式提出的天线阵列的信道信息反馈方法的流程示意图。
图2为本发明图1所示实施方式中天线阵列分组的示意图。
图3为本发明另一种实施方式提出的天线阵列的信道信息反馈方法的流程示意图。
图4为本发明一种实施方式提出的用于天线阵列的信道信息反馈装置的示意图。
图5实施方式为本发明另一种实施方式提出的用于天线阵列的信道信息反馈装置的示意图。
具体实施方式
下面将结合本发明实施方式中的附图，对本发明实施方式中的技术方案进行较为清楚、完整地描述，显然，所描述的实施方式是本发明一部分实施 方式，而不是全部的实施方式。基于本发明中的实施方式，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施方式，都属于本发明保护的范围。
为了方便理解本发明实施方式中的技术方案，首先在此介绍几个相关的概念；
1)天线
天线是一种用来发射或接收无线电波或电磁波的电子器件。从物理上讲，天线是一个或多个导体的组合，由它可因施加的交变电压和相关联交变电流而产生辐射的电磁场，或者可以将它放置在电磁波中，由于场的感应而在天线内部产生交变电流并在其终端产生交变电压。天线的带宽是指它有效 工作的频率范围。
2)天线阵列
单一天线的方向性是有限的，为适合各种场合的应用，将工作在同一频率的两个或多个单个天线，按照一定的要求进行馈电和空间排列，构成天线阵列，也叫天线阵。构成天线阵的天线辐射单元称为阵元。
天线阵列的工作原理：可以看作是电磁波的叠加，对几列电磁波来讲，当它们传到同一区域时，按照叠加原理，电磁波将产生矢量叠加。叠加的结果，不仅与各列电磁波的振幅大小有关，而与它们在相遇区间内相互之间的相位差有关。位于不同位置上的发射天线所发出的电磁波传到同一接收区域造成的空间相位出现差别，必然引起几列电磁波在相遇区域出现下列两种情况：同相位叠加，总场强增强；反相位叠加，总场强削弱。若总场强的增强和削弱区域在空间保持相对固定，就相当于用天线阵改变了单个天线的辐射场结构，即天线阵改变了辐射场大小和方向性的原理。
目前，对于信道状态信息(Channel state information，CSI)测量可以是分测量瞬时CSI，如测量信道本身获得；或者可以是测量统计CSI，如测量信道的自相关矩阵获得。对于大规模天线阵列而言，测量更多在于统计意义上对信道的处理，包括降维，以及波速扫描(Grid of beamforming，GOB)。
典型的，在大规模天线阵列进行频分双工(Frequency Division Duplex，FDD)制式传输或者是时分双工(Time Division Duplexing，TDD)制式传输时，CSI的获取主要通过下行测量以及用户设备(User equipment，UE)反馈获得。具体地，在长期演进(Long Term Evolution，LTE)长期演进/LTE-A， UE根据下行测量的信道信息获取秩指标(Rank indicator，RI)以及空间预编码指示(英文名称：Precoding matrix indicator，英文缩写：PMI)，并按预定的预编码码本加以量化后反馈给基站，以确定预编码矩阵。基站接收到RI与PMI后，再进行数据与用于解调的小区专用参考信号(Cell specific reference signal，CRS)或者解调参考符号(DM-RS)发送
本发明第一实施方式中提出一种天线阵列的信道反馈方法，用于获取第一网络设备的天线阵列与第二网络设备的天线阵列之间的信道的信道信息。
其中，第一网络设备可以是宏基站、微基站或者用户设备等各种形态的网络设备，其天线阵列包括M个子阵。第二网络设备可以是用户设备，如移动电话、平板电脑等便携式设备，随着未来物联网的发展，第二网络设备或者还可以是具有天线的终端，如智能冰箱、智能电视等智能家电。
请参照图1，本发明实施方式中天线阵列的信道反馈方法的实现流程包括：
101，第二网络设备生成第一网络设备的天线阵列与第二网络设备的天线阵列之间的N×M个子信道的信道信息。
第一网络设备的天线阵列包括M个子阵，第二网络设备的天线阵列包括N个子阵，M和N为正整数且不同时为1，M个子阵和N个子阵中包含至少两根天线。一种典型的天线阵列包含的天线子阵数相同并且对称。以第一网络设备的天线阵列为例进行说明，参照图2，假设天线阵列包含36根天线，将第一网络设备的天线阵列划分为4个子阵，每一子阵包括8根天线，并且4个子阵对称设置。可以理解的是，配置的规则不局限于此，在其他的实施方式中，每个子阵中包括的天线数量可以不同，也可以不对称设置。
对应于第一网络设备的M个子信道以及第二网络设备的N个子信道，第一网络设备的天线阵列与第二网络设备的天线阵列之间包括N×M个子信道。
具体地，第一网络设备的天线阵列与第二网络设备的天线阵列之间的N×M个子信道的信道信息包括秩指标RI与预编码矩阵指示PMI，或者是预编码。第二网络设备可以响应来自第一网络设备的参考信号(Reference Signal,RS)获取上述N×M个子信道的信道信息，或者可以基于信道互易性获取上述N×M个子信道的信道信息。
在本实施方式中，设K＝N×M，K个子信道的信道信息根据以下步骤获 得：
获取K个子信道的信道矩阵的自相关矩阵。示例性地，根据预定的子阵配置信息，对第一网络设备与第二网络设备之间的信道进行分组获得K个子信道：
H＝(H1,H2,…,Hk,…HK)
其中，Hk维度为L×Mk，
Figure PCTCN2015079290-appb-000001
Mk为第k个天线组的天线端口数。
根据K个子信道的信道矩阵的自相关矩阵获得K个子信道的RIk与PMIk。示例性地，获得K个子信道的RI与PMI的步骤包括：
第二网络设备根据K个子信道获取K个子信道的自相关矩阵；
对K个子信道对应的自相关矩阵进行特征值分解(英文全称：Eigenvalue decomposition,英文缩写：EVD)或者奇异值分解(英文全称：Singular Value Decomposition，英文缩写：SVD)获得相应的预编码Uk。
第二网络设备可以将K个子信道对应预编码Uk反馈给第一网络设备。或者进一步地，对Uk对应的码本进行量化，分别获得K个子信道的RIk与PMIk并反馈给第一网络设备。具体的，第一网络设备与第二网络设备使用的预编码码本中每个码字的维度为Mk×r，其中Mk为第k个天线组的天线端口数，r为流数。
可见，当第一网络设备的天线数量较大时，上述SVD或者EVD的复杂度较高。通过对第一网络设备与第二网络设备之间天线阵列进行分组，会大大降低SVD或者EVD的复杂度。
102、第二网络设备向第一网络设备发送第一网络设备的天线阵列与第二网络设备的天线阵列之间的N×M个子信道的信道信息。
103、第一网络设备接收来自第二网络设备的第一网络设备的天线阵列与第二网络设备的天线阵列之间的N×M个子信道的信道信息。
104、第一网络设备根据来自第二网络设备的第一网络设备的天线阵列与第二网络设备的天线阵列之间的N×M个子信道的信道信息生成第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道的信道信息。可选地，当第一网络设备接收到的N×M个子信道的信道信息为预编码Uk时，第一网络设备根据K个子信道的预编码Uk获得第一网络设备的天线阵列与第二网络设备的天线阵列之间的信道的预编码U，具体根据以下表达式获得：
Figure PCTCN2015079290-appb-000002
第一网络设备对预编码U进行量化，获得第一网络设备天线阵列与第二网络设备的天线阵列之间的信道的RI与PMI。当第一网络设备接收到的N×M个子信道的信道信息为秩指标RIk与预编码指示PMIk时，对K个子信道的秩指标RIk与预编码指示PMIk进行合并，或者通过容量最大化算法，或者其它算法获得第一网络设备天线阵列与第二网络设备的天线阵列之间的信道的RI与PMI。
请参照图3，在其他的实施方式中，可选地，用于天线阵列的信道信息反馈方法还包括：
100，第一网络设备向第二网络设备发送子阵配置信息，子阵配置信息用于将第一网络设备的天线阵列划分为M个子阵，其中，M为大于2的正整数。
可选地，该步骤100位于步骤101之前，该子阵配置信息用于对第一网络设备的天线阵列进行预设。
可选地，该步骤100位于步骤103之后，该子阵配置信息用于对第一网络设备的天线阵列进行动态地更新。具体地，第一网络设备在变换天线阵列时，向第二网络设备发送该子阵配置信息。该子阵配置信息的发送可以通过物理下行控制信道(英文全称：Physical Downlink Control Channel，英文缩写：PDCCH)或者无线链路层控制协议(Radio Link Control，英文缩写：RLC)，或者广播信令(英文全称：Physical broadcast channel，英文缩写：PBCH)实现。
不管该子阵配置信息是用于对第一网络设备的天线阵列进行预设，或者是用于对第一网络设备的天线阵列进行动态更新，子阵配置信息中包括子阵分组的规则，第一网络设备的天线阵列分组根据子阵配置信息中包括的预设规则进行划分。可选地，在其他的实施方式中，还进一步对预设规则进行编号，如此，第一网络设备通过发送该编号，通知第二网络设备所采用的预设规则。
示例性地，该预设的规则包括至少一个图样(Pattern)，第二网络设备的天线阵列的N个子阵根据该至少一个图样确定。请参照图2，可以作为一 个图样的举例，第一网络设备的天线阵列被划分为4个子阵。
示例性地，该预设的规则为每个子阵的起始端口(Port)号，第一网络设备的天线阵列的N个子阵中的每个子阵根据起始端口号确定。
在本实施方式中，通过对第一网络设备的天线阵列与第二网络设备的天线阵列进行分组，形成多个天线子阵并获取与对多个天线子阵对应的第一网络设备天线阵列与第二网络设备天线阵列之间多个子信道信道信息，并根据多个子信道信息获取第一网络设备天线阵列与第二网络设备天线阵列之间的信道信息，降低了获取信道信息的复杂度，提升了系统效率。
本发明另一实施方式还提出的一种用于天线阵列的信道信息反馈的装置，应用于第一网络设备，用于执行步骤103以及104。请参照图3，用于天线阵列的信道信息反馈的装置200包括接收模块210、处理模块220。
接收模块210，用于接收第二网络设备发送的N×M个子信道的信道信息。其中，第一网络设备的天线阵列包括M个子阵，第二网络设备的天线阵列包括N个子阵，第一网络设备的天线阵列与第二网络设备的天线阵列之间的信道包括N×M个子信道，M和N为正整数且不同时为1，M个子阵和N个子阵中包括至少两根天线。
处理模块220，用于用于根据来自所述接收模块的所述N×M个子信道的信道信息生成所述所述第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道的信道信息。
具体地，所述N×M个子信道的子信道信息包括秩指示RI与预编码矩阵指示PMI。
可选地，在其他的实施方式中，用于天线阵列的信道信息反馈的装置还用于执行上述步骤100。请参照图5，装置200还包括发送模块230。
发送模块230，用于向所述第一网络设备发送子阵配置信息，所述子阵配置信息用于将所述第一网络设备的天线阵列划分为M个子阵，其中，M为大于或者等于2的正整数。具体地，该子阵配置信息可以由发送模块230通过PDCCH发送，或者可以通过RLC信令发送，或者可以通过PBCH发送。
示例性地，子阵配置信息包括至少一个图样，第一网络设备的阵列天线的M个子阵根据该至少一个图样确定。
示例性地，子阵配置信息所包括每个子阵的起始端口号，第一网络设备 的阵列天线的M个子阵根据所述每个子阵的起始端口号确定。
本发明另一实施方式还提出的一种用于天线阵列的信道信息反馈的装置，应用于第二网络设备，用于执行步骤101以及102。请参照图3，用于天线阵列的信道信息反馈的装置300包括处理模块310以及发送模块320。
处理模块310，用于生成第一网络设备的天线阵列与第二网络设备的天线阵列之间的信道的N×M个子信道的信道信息。其中，第一网络设备的天线阵列包括M个子阵，第二网络设备的天线阵列包括N个子阵，M和N为正整数且不同时为1，M个子阵和N个子阵中包括至少两根天线。
具体地，第一网络设备的天线阵列与第二网络设备的天线阵列之间的N×M个子信道的信道信息包括秩指标RI与预编码矩阵指示PMI。处理模块310可以响应来自第一网络设备的参考信号(Reference Signal,RS)获取上述N×M个子信道的信道信息，或者可以基于信道互易性获取上述N×M个子信道的信道信息。
发送模块320，用于向第一网络设备发送N×M个子信道的信道信息，以使第一网络设备根据N×M个子信道的信道信息生成第一网络设备的天线阵列与第二网络设备的天线阵列之间的信道的信道信息。
可选地，在其他的实施方式中，请参照图3，用于天线阵列的信道信息反馈的装置300包括接收模块330。
接收模块330，用于接收所述第一网络设备发送的子阵配置信息，所述子阵配置信息用于将所述第一网络设备的天线阵列划分为M个子阵，其中，M为大于2的正整数。具体地，该子阵配置信息可以由接收模块330通过PDCCH接收，或者可以通过接收RLC信令获得，或者可以通过PBCH接收。
示例性地，子阵配置信息包括至少一个图样，第一网络设备的阵列天线的M个子阵根据该至少一个图样确定。
示例性地，子阵配置信息所包括每个子阵的起始端口号，第一网络设备的阵列天线的M个子阵根据所述每个子阵的起始端口号确定。
另外，在本发明各个实施方式中的各模块可以集成在一个处理模块中，或者可以是各个模块单独物理存在，或者可以是两个或两个以上模块集成在一个模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。结合本发明实施方式所公开的方法的步骤可以直接体现为硬件编码处理器执行完成，或者用编码处理器中的硬件及软件模块组合 执行完成。软件模块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、寄存器等存储介质中。
上述模块或者集成的模块如果以硬件的形式实现，可以为集成电路(Integrated Circuit，IC)、专用集成电路(Application Specific Integrated Circuit、ASIC)、现场可编程门阵列(Field－Programmable Gate Array，FPGA)等，也可以集成在基带处理器或通用处理器中。
上述模块或者集成的模块如果以软件功能模块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，本发明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)执行本发明各个实施方式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(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本发明的具体实施方式，但本发明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发明揭露的技术范围内，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发明的保护范围之内。因此，本发明的保护范围应以权利要求的保护范围为准。

Claims (26)

  1. 一种天线阵列的信道信息反馈方法，包括：
    第一网络设备接收第二网络设备发送的所述N×M个子信道的信道信息，其中所述第一网络设备的天线阵列包括M个子阵，所述第二网络设备的天线阵列包括N个子阵，所述第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道包括所述N×M个子信道，所述M和N为正整数且不同时为1，所述M个子阵和所述N个子阵中包括至少两根天线；
    根据来自第二网络设备的所述N×M个子信道的信道信息生成所述第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道的信道信息。
  2. 根据权利要求1所述的方法，其特征在于，所述N×M个子信道的信道信息包括秩指示RI与预编码矩阵指示PMI，所述N×M个子信道中每个子信道对应一个子信道矩阵，所述N×M个子信道的信道信息根据以下步骤获得：
    获取N×M个子信道对应的子信道矩阵的自相关矩阵；
    根据所述N×M个子信道的信道矩阵的自相关矩阵获得N×M个子信道的RI与PMI。
  3. 根据权利要求1所述的方法，其特征在于，所述N×M个子信道的信道信息包括预编码，所述N×M个子信道中每个子信道对应一个子信道矩阵，所述N×M个子信道的信道信息根据以下步骤获得：
    获取N×M个子信道对应的子信道矩阵的自相关矩阵；
    根据所述N×M个子信道的信道矩阵的自相关矩阵获得N×M个子信道的预编码。
  4. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    所述第一网络设备向所述第二网络设备发送子阵配置信息，所述子阵配置信息用于将所述第一网络设备的天线阵列划分为M个子阵，其中，M为大于或者等于2的正整数。
  5. 根据权利要求4所述的方法，其特征在于，所述子阵配置信息包括至少一个图样，所述M个子阵根据所述至少一个图样确定。
  6. 根据权利要求4所述的方法，其特征在于，所述子阵配置信息包括每个子阵的起始端口号，所述M个子阵中的每个子阵根据所述起始端口号 确定。
  7. 根据权利要求3所述的方法，其特征在于，所述子阵配置信息通过物理下行公共控制信道PDCCH、无线链路层控制协议RLC信令或者物理广播信道PBCH发送。
  8. 一种天线阵列的信道信息反馈方法，包括：
    第二网络设备生成第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道的N×M个子信道的信道信息，其中，所述第一网络设备的天线阵列包括M个子阵，所述第二网络设备的天线阵列包括N个子阵，所述M和N为正整数且不同时为1，所述M个子阵和所述N个子阵中包括至少两根天线；
    向所述第一网络设备发送所述N×M个子信道的信道信息，以使所述第一网络设备根据N×M个子信道的信道信息生成所述所述第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道的信道信息。
  9. 根据权利要求8所述的方法，其特征在于，所述N×M个子信道的信道信息是秩指示RI与预编码矩阵指示PMI，所述N×M个子信道中每个子信道对应一个子信道矩阵，所述N×M个子信道的信道信息根据以下步骤获得：
    获取N×M个子信道的信道矩阵的自相关矩阵；
    根据所述N×M个子信道的信道矩阵的自相关矩阵获得N×M个子信道的RI与PMI。
  10. 根据权利要求8所述的方法，其特征在于，所述N×M个子信道的信道信息包括预编码，所述N×M个子信道中每个子信道对应一个子信道矩阵，所述第二网络设备生成第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道的N×M个子信道的信道信息具体包括：
    获取N×M个子信道的信道矩阵的自相关矩阵；
    根据所述N×M个子信道的信道矩阵的自相关矩阵获得N×M个子信道的预编码。
  11. 根据权利要求8所述的方法，其特征在于，所述方法还包括：
    所述第二网络设备接收所述第一网络设备发送的子阵配置信息，所述子阵配置信息用于将所述第一网络设备的天线阵列划分为M个子阵，其中，M为大于或者等于2的正整数。
  12. 根据权利要求11所述的方法，其特征在于，所述子阵配置信息包括至少一个图样，所述N个子阵根据所述至少一个图样确定。
  13. 根据权利要求11所述的方法，其特征在于，所述子阵配置信息包括每个子阵的起始端口号，所述M个子阵根据所述每个子阵的起始端口号确定。
  14. 根据权利要求11所述的方法，其特征在于，所述子阵配置信息通过物理下行公共控制信道PDCCH、无线链路层控制协议RLC信令或者物理广播信道PBCH发送。
  15. 一种用于天线阵列的信道信息反馈的装置，包括：
    接收模块，用于接收所述第二网络设备发送的所述N×M个子信道的信道信息，其中所述第一网络设备的天线阵列包括M个子阵，所述第二网络设备的天线阵列包括N个子阵，所述第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道包括所述N×M个子信道，所述M和N为正整数且不同时为1，所述M个子阵和所述N个子阵中包括至少两根天线；
    处理模块，用于根据来自所述接收模块的所述N×M个子信道的信道信息生成所述所述第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道的信道信息。
  16. 根据权利要求15所述的装置，其特征在于，所述发送模块用于向所述第二网络设备发送子阵配置信息，所述子阵配置信息用于将所述第一网络设备的天线阵列划分为M个子阵，其中，M为大于或者等于2的正整数。
  17. 根据权利要求16所述的装置，其特征在于，所述子阵配置信息包括至少一个图样，所述M个子阵根据所述至少一个图样确定。
  18. 根据权利要求17所述的装置，其特征在于，所述子阵配置信息所包括每个子阵的起始端口号，所述M个子阵根据所述每个子阵的起始端口号确定。
  19. 根据权利要求17所述的装置，其特征在于，所述子阵配置信息通过物理下行公共控制信道PDCCH、无线链路层控制协议RLC信令或者物理广播信道PBCH发送。
  20. 一种用于天线阵列的信道信息反馈装置，包括：
    处理模块，用于生成第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道的N×M个子信道的信道信息，其中，所述第一网络设备 的天线阵列包括M个子阵，所述第二网络设备的天线阵列包括N个子阵，所述M和N为正整数且不同时为1，所述M个子阵和所述N个子阵中包括至少两根天线；
    发送模块，用于向所述第一网络设备发送所述N×M个子信道的信道信息，以使所述第一网络设备根据N×M个子信道的信道信息生成所述所述第一网络设备的天线阵列与所述第二网络设备的天线阵列之间的信道的信道信息。
  21. 根据权利要求20所述的装置，其特征在于，所述N×M个子信道的信道信息是秩指示RI与预编码矩阵指示PMI，所述N×M个子信道中每个子信道对应一个子信道矩阵，所述处理模块具体用于：
    获取N×M个子信道的信道矩阵的自相关矩阵；
    根据所述N×M个子信道的信道矩阵的自相关矩阵获得N×M个子信道的RI与PMI。
  22. 根据权利要求20所述的装置，其特征在于，所述信道信息是秩指示RI与预编码矩阵指示PMI，所述N×M个子信道中每个子信道对应一个子信道矩阵，所述处理模块具体用于：
    获取N×M个子信道的信道矩阵的自相关矩阵；
    根据所述N×M个子信道的信道矩阵的自相关矩阵获得N×M个子信道的预编码。
  23. 根据权利要求20所述的装置，其特征在于，所述装置还包括：
    接收模块，用于接收所述第一网络设备发送的子阵配置信息，所述子阵配置信息用于将所述第一网络设备的天线阵列划分为M个子阵，其中，M为大于或者等于2的正整数。
  24. 根据权利要求23所述的装置，其特征在于，所述子阵配置信息包括至少一个图样，所述N个子阵根据所述至少一个图样确定。
  25. 根据权利要求23所述的装置，其特征在于，所述子阵配置信息包括每个子阵的起始端口号，所述M个子阵根据所述每个子阵的起始端口号确定。
  26. 根据权利要求23所述的装置，其特征在于，所述子阵配置信息通过物理下行公共控制信道PDCCH、无线链路层控制协议RLC信令或者物理广播信道PBCH发送。
PCT/CN2015/079290 2015-05-19 2015-05-19 天线阵列的信道信息反馈方法与装置 Ceased WO2016183803A1 (zh)

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