CN110868245B - Information transmission method and equipment - Google Patents

Information transmission method and equipment Download PDF

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CN110868245B
CN110868245B CN201810988591.6A CN201810988591A CN110868245B CN 110868245 B CN110868245 B CN 110868245B CN 201810988591 A CN201810988591 A CN 201810988591A CN 110868245 B CN110868245 B CN 110868245B
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subband
wideband
precoding matrix
beam set
beams
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CN110868245A (en
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李辉
高秋彬
缪德山
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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    • 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
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
    • 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
    • H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
    • 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
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]

Abstract

The application discloses an information transmission method and equipment, which are used for reducing the cost of precoding matrix information transmission. On a terminal side, an information transmission method provided in an embodiment of the present application includes: determining first precoding matrix information; wherein the first precoding matrix information includes: a wideband weighting coefficient for each beam in a wideband beam set and a subband weighting coefficient for each beam in a subband beam set, wherein each beam in the subband beam set is selected from the wideband beam set; and sending the rest information except the fixed weighting coefficient appointed by the system in the first precoding matrix information as second precoding matrix information to a network side.

Description

Information transmission method and equipment
Technical Field
The present application relates to the field of communications technologies, and in particular, to an information transmission method and device.
Background
In new wireless (NR) systems, type two (TypeII) codebooks are defined. It supports rank (rank)1 and rank2 codebooks based on the way beams within the orthogonal beam group are linearly combined. The rank1 codebook is expressed as:
Figure BDA0001780240230000011
the rank2 codebook is expressed as:
Figure BDA0001780240230000012
wherein the content of the first and second substances,
Figure BDA0001780240230000013
l represents the number of orthogonal beams within the group,
Figure BDA0001780240230000014
orthogonal beams are represented using 2D Discrete Fourier Transform (DFT) vectors, where r is 0,1 represents the first and second polarization directions in a dual-polarized antenna array, and l is 0, and 1 represents a layer.
Figure BDA0001780240230000015
Representing wideband amplitude quantization factors acting on a beam i, a polarization direction r and a layer l in a beam group;
Figure BDA0001780240230000016
representing the subband amplitude quantization factors acting on the beam i, the polarization direction r and the layer l in the beam group; c. Cr,l,iRepresenting the subband phase quantization factors acting on beam i, polarization direction r and layer l in the beam set. The number of antenna ports that can be supported by this codebook structure is 4,8,12,16,24, 32.
According to the codebook structure, the fact that a Type II codebook needs to determine an orthogonal beam group can be obtained. Each layer independently linearly weights all beams in the orthogonal beam group, and quantifies the amplitude and phase of the linear weighting coefficients.
In summary, the feedback of the Type II codebook includes a wideband part and a subband part, wherein the wideband part performs parameter calculation and feedback for the configured whole bandwidth, and the subband part performs parameter calculation and feedback for each subband. When the number of sub-bands is large, the feedback overhead of the Type II codebook is mainly determined by the sub-band part. For the Type II codebook, if the base station is configured as wideband amplitude feedback (the parameter subband amplitude is configured as 'false'), for the wideband part, the terminal needs to feed back the wideband amplitude weighting factor of each orthogonal beam; and the sub-band part, for each sub-band, the terminal needs to feed back the sub-band phase weighting factor of each orthogonal beam. If the base station is configured with subband amplitude feedback (the parameter subband amplitude is configured with 'true'), for the wideband part, the terminal needs to feed back the wideband amplitude weighting factor of each orthogonal beam; and the sub-band part, for each sub-band, the terminal needs to feed back the sub-band amplitude weighting factor and the sub-band phase weighting factor of each orthogonal beam. Therefore, the size of the feedback overhead is related to the number of configured orthogonal beams. The number of orthogonal beams for linear combining supported by the current Type II codebook is L-2, L-3, and L-4. When the value of the beam number L is large, the feedback overhead is large, and more uplink resources are occupied.
Disclosure of Invention
The embodiment of the application provides an information transmission method and equipment, which are used for reducing the cost of precoding matrix information transmission.
On a terminal side, an information transmission method provided in an embodiment of the present application includes:
determining first precoding matrix information; wherein the first precoding matrix information includes: a wideband weighting coefficient for each beam in a wideband beam set and a subband weighting coefficient for each beam in a subband beam set, wherein each beam in the subband beam set is selected from the wideband beam set;
and sending the rest information except the fixed weighting coefficient appointed by the system in the first precoding matrix information as second precoding matrix information to a network side.
Determining first precoding matrix information by the method; wherein the first precoding matrix information includes: a wideband weighting coefficient for each beam in a wideband beam set and a subband weighting coefficient for each beam in a subband beam set, wherein each beam in the subband beam set is selected from the wideband beam set; and sending the rest information except the fixed weighting coefficient appointed by the system in the first precoding matrix information as second precoding matrix information to a network side, so that the weighting coefficient of each beam does not need to be fed back aiming at the sub-band part, and the transmission cost of the precoding matrix information can be reduced.
Optionally, for each polarization direction, after each beam in the wideband beam set is weighted by the wideband weighting coefficient, a first beam of the polarization direction is synthesized; for each polarization direction of each layer, after each beam in the subband beam set is weighted by the subband weighting coefficient, synthesizing a second beam of the polarization direction of the layer, wherein the second beam is a differential beam of the first beam.
Optionally, the wideband weighting factor comprises: a wideband amplitude weighting factor and/or a wideband phase weighting factor for beams in the wideband set of beams.
Optionally, the subband weighting coefficients include: subband amplitude weighting factors and/or subband phase weighting factors for beams in a subband beam set.
Optionally, the precoding matrix information further includes: indication information of beams in the wideband beam set, and/or indication information of beams in the subband beam set.
Optionally, the number of beams in the wideband beam set and/or the number of beams in the subband beam set is determined by the network side and indicated to the terminal; alternatively, the first and second electrodes may be,
and the number of the beams in the subband beam set is determined by the terminal and fed back to the network side.
Correspondingly, on the network side, an information transmission method provided in the embodiment of the present application includes:
receiving second precoding matrix information sent by a terminal; determining first precoding matrix information according to a fixed weighting coefficient agreed by a system; wherein the first precoding matrix information includes: a wideband weighting coefficient for each beam in a wideband beam set and a subband weighting coefficient for each beam in a subband beam set, wherein each beam in the subband beam set is selected from the wideband beam set;
and generating a precoding matrix according to the first precoding matrix information.
Optionally, the wideband weighting factor comprises: a wideband amplitude weighting factor and/or a wideband phase weighting factor for beams in the wideband set of beams.
Optionally, the subband weighting coefficients include: subband amplitude weighting factors and/or subband phase weighting factors for beams in a subband beam set.
Optionally, for each polarization direction, after each beam in the wideband beam set is weighted by the wideband weighting coefficient, a first beam of the polarization direction is synthesized; for each polarization direction of each layer, after each beam in the subband beam set is weighted by the subband weighting coefficient, synthesizing a second beam of the polarization direction of the layer, wherein the second beam is a differential beam of the first beam.
Optionally, the precoding matrix W may be constructed by the first beam and the second beam according to the following formula:
Figure BDA0001780240230000041
or
Figure BDA0001780240230000042
Wherein, theta represents the multiplication of corresponding elements,
Figure BDA0001780240230000043
represents kronecker product; l represents the number of beams in the wideband beam set, K represents the number of beams in the subband beam set, BlRepresents the value range of the wave beam L, L in the broadband wave beam set as [0, L]，clA wideband weighting factor representing the corresponding beam, with amplitude as a wideband amplitude weighting factor and phase as a wideband phase weighting factor; subband beam selection matrix EL×K＝[e0 e1 … eK-1]，ekIs a column selection vector with length L, and K has a value range of [0, K]，ai,jThe subband weighting factor representing the beam in the corresponding subband beam set for layer j has amplitude as the subband amplitude weighting factor and phase as the subband phase weighting factor, and i has a value in the range of [0,2K-1 ]]J has a value in the range of [0, r-1 ]]；
Figure BDA0001780240230000051
Is a full 1 vector of 1 row and r columns, r representing the rank of the precoding matrix.
Optionally, the precoding matrix information further includes: indication information for each beam in the wideband beam set, and/or indication information for each beam in the subband beam set.
Optionally, before receiving the precoding matrix information sent by the terminal, the method further includes:
configuring codebook parameter information; the codebook parameter information comprises the number of CSI-RS ports;
and sending the codebook parameter information to the terminal.
Optionally, the codebook parameter information further includes: a number of beams in the wideband beam set and/or a number of beams in the subband beam set.
On a terminal side, an information transmission device provided in an embodiment of the present application includes:
a determining unit, configured to determine first precoding matrix information; wherein the first precoding matrix information includes: a wideband weighting coefficient for each beam in a wideband beam set and a subband weighting coefficient for each beam in a subband beam set, wherein each beam in the subband beam set is selected from the wideband beam set;
and the sending unit is used for sending the rest information except the fixed weighting coefficient appointed by the system in the first precoding matrix information to a network side as second precoding matrix information.
On a network side, an information transmission device provided in an embodiment of the present application includes:
a receiving unit, configured to receive second precoding matrix information sent by a terminal; determining first precoding matrix information according to a fixed weighting coefficient agreed by a system; wherein the first precoding matrix information includes: a wideband weighting coefficient for each beam in a wideband beam set and a subband weighting coefficient for each beam in a subband beam set, wherein each beam in the subband beam set is selected from the wideband beam set;
and the generating unit is used for generating a precoding matrix according to the first precoding matrix information.
Another embodiment of the present application provides a computing device, which includes a memory and a processor, wherein the memory is used for storing program instructions, and the processor is used for calling the program instructions stored in the memory and executing any one of the above methods according to the obtained program.
Another embodiment of the present application provides a computer storage medium having stored thereon computer-executable instructions for causing a computer to perform any one of the methods described above.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram illustrating selection of beams in a wideband beam set according to an embodiment of the present application;
fig. 2 is a flowchart illustrating an information transmission method at a terminal side according to an embodiment of the present application;
fig. 3 is a schematic flowchart of an information transmission method at a network side according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an information transmission apparatus at a terminal side according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an information transmission device on a network side according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of another information transmission apparatus at a terminal side according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of another information transmission device on a network side according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
A type ii (type ii) codebook is defined in the NR system. The method is based on linear combination of orthogonal beams, has higher channel quantization precision, but has large feedback overhead. The embodiment of the application provides a method and equipment for transmitting precoding matrix information of a low-overhead Type II codebook.
The method and the device are based on the same application concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.
The technical scheme provided by the embodiment of the application can be suitable for various systems, particularly 5G systems. For example, the applicable system may be a global system for mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS) system, a Long Term Evolution (LTE) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a universal microwave Access (WiMAX) system, a 5G NR system, and the like. These various systems include terminal devices and network devices.
The terminal device referred to in the embodiments of the present application may refer to a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or other processing device connected to a wireless modem. The names of the terminal devices may also be different in different systems, for example, in a 5G system, the terminal devices may be referred to as User Equipments (UEs). Wireless terminal devices, which may be mobile terminal devices such as mobile telephones (or "cellular" telephones) and computers with mobile terminal devices, e.g., mobile devices that may be portable, pocket, hand-held, computer-included, or vehicle-mounted, communicate with one or more core networks via the RAN. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. The wireless terminal device may also be referred to as a system, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile), a remote station (remote station), an access point (access point), a remote terminal device (remote terminal), an access terminal device (access terminal), a user terminal device (user terminal), a user agent (user agent), and a user device (user device), which are not limited in this embodiment of the present application.
The network device according to the embodiment of the present application may be a base station, and the base station may include a plurality of cells. A base station may also be referred to as an access point, or a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or by other names, depending on the particular application. The network device may be configured to interconvert received air frames with Internet Protocol (IP) packets as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiment of the present application may be a Base Transceiver Station (BTS) in a global system for mobile communications (GSM) or a Code Division Multiple Access (CDMA), may also be a network device (NodeB) in a Wideband Code Division Multiple Access (WCDMA), may also be an evolved network device (eNB or e-NodeB) in a Long Term Evolution (LTE) system, a 5G base station in a 5G network architecture (next generation system), and may also be a home evolved node B (HeNB), a relay node (relay node), a home base station (femto), a pico base station (pico), and the like, which are not limited in the embodiments of the present application.
Various embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the display sequence of the embodiment of the present application only represents the sequence of the embodiment, and does not represent the merits of the technical solutions provided by the embodiments.
The feedback method for the channel state information weighting coefficient provided in the embodiment of the present application divides the precoding matrix into a wideband part (first beam) and a subband difference part (second beam) based on a difference method. The wideband part can be synthesized by L beams configured by the base station, and the sub-band difference part selects a part of beams from the L beams used by the wideband part for synthesis. Since the sub-band part uses a smaller number of beams, the feedback overhead per sub-band is reduced. When the number of the sub-bands is large, the feedback overhead of the Type II codebook is mainly determined by the sub-band part, and the method can reduce the feedback overhead of the precoding matrix information of the Type II codebook.
On the terminal side, the channel state information feedback method provided by the embodiment of the application comprises the following steps:
the method comprises the following steps: and the terminal determines that the L wave beams form a broadband wave beam set according to the configuration of the base station, wherein L is more than or equal to 2. The beams in the broadband beam set may be referred to simply as broadband beams.
Step two: the terminal determines, for L beams of the set of wideband beams, a wideband amplitude weighting factor and/or a wideband phase weighting factor for each beam for each polarization direction.
Step three: for a precoding matrix of rank r (r layers in total, the precoding matrix is r columns), for each subband of each layer for each polarization direction, a subband beam set is determined, and for each beam in the subband beam set, a subband amplitude weighting factor and/or a subband phase weighting factor is determined. A beam in a subband beam set may be referred to as a subband beam for short.
The subband beam set in step three may be formed by selecting, by the terminal, K beams from the wideband beam set determined in step one on each subband, and feeding back indication information of the K beams to the base station; or K beams in a predefined wideband beam set by the system constitute a subband beam set.
Specifically, how the terminal selects K beams from the L wideband beams as subband beams may be selected according to an actual channel measurement result, for example, the terminal may select the K beams with the strongest reference signal received power RSRP or the K beams with the weakest RSRP according to a preset rule, and specifically how to select the K beams is not limited in this embodiment of the present application.
Step four: and the terminal feeds back the determined precoding matrix information to the base station. The precoding matrix information includes at least: indication information of L beams in the wideband beam set (for indicating which beams in particular), a wideband amplitude weighting factor and/or a wideband phase weighting factor for each beam of each polarization direction, a subband amplitude weighting factor and/or a subband phase weighting factor for each beam in the subband beam set for each subband of each layer of each polarization direction.
Correspondingly, on the base station side, the method provided by the embodiment of the application comprises the following steps:
step one, configuring codebook parameter information, wherein the codebook parameter information at least includes the number of channel state information reference signal (CSI-RS) ports, and may also include the number L of beams in a wideband beam set.
Optionally, the codebook parameter information in the first step may further include the number K of beams in the subband beam set.
And step two, receiving precoding matrix information fed back by the terminal, and generating a precoding matrix W according to the following relational expression (1) or (2) for data transmission.
Figure BDA0001780240230000101
Wherein, Θ represents the multiplication (dot product) of the corresponding elements, BlRepresenting a beam l of a set of wideband beams, of length N1·N2A column vector of, and N1And N2Respectively representing the number of antenna ports of a first dimension and the number of antenna ports of a second dimension in one polarization direction. c. ClRepresenting the wideband weighting factor for the corresponding quadrature beam with amplitude as the wideband amplitude weighting factor and phase as the wideband phase weighting factor. Subband beam selection matrix EL×K＝[e0 e1 … eK-1]，ekFor a column selection vector of length L, a typical implementation is ekOnly one element in the series is 1, and the rest are zero. a isi,jThe subband weighting factors for the beams in the corresponding subband beam set representing layer j have amplitudes as subband amplitude weighting factors and phases as subband phase weighting factors. Wherein the content of the first and second substances,
Figure BDA0001780240230000102
is a full 1 vector of 1 row and r columns.
Or
Figure BDA0001780240230000111
Examples of several specific embodiments are given below:
the first embodiment is as follows:
assume that the system adopts the precoding matrix structure shown in formula (1). And each beam in the set of wideband beams is mutually orthogonal.
The base station side configures codebook parameter information and indicates that the number of CSI-RS ports in one polarization direction is (N)1，N2) (4,2) (total CSI-RS port number 2N)1N216), the number of beams in the wideband beam set is L4. In addition, the number of beams in the subband beam set configured by the system is K-2.
Indication by the terminal according to the base station, and this (N) predefined by the system1，N2) Configured oversampling factor of (O)1，O2) (4,4) determined at N1·O1·N2·O2L-4 orthogonal beams are selected from the 128 beams to form a wideband beam set. As shown in fig. 1. Since the oversampling factor is 4, where N is1Or N2Beams spaced every 4 beams in the direction are mutually orthogonal beams. For example, referring to fig. 1, the 8 beams with the numbered gray fill are all orthogonal to each other, and the 8 beams with the non-numbered gray fill are all orthogonal to each other.
The determination of the set of wideband beams may be made using existing implementations. One way is to calculate the received powers of different beams according to the result of channel measurement, and select the first L orthogonal beams with the largest power as the beams in the wideband beam set. For example, beams 3,4,5,6 in fig. 1 are selected.
The terminal determines the wideband weighting factors for L-4 orthogonal beams according to the structure of the first beam:
Figure BDA0001780240230000121
the determination of this coefficient can be obtained by projection of the wideband eigenvector of the channel on L-4 orthogonal beams. Wherein
Figure BDA0001780240230000122
plIn order to be a broadband amplitude weighting factor,
Figure BDA0001780240230000123
is a wideband phase weighting factor.
For a precoding matrix with rank r-1, determining K-2 beams to form a subband beam set and determining corresponding subband weighting factors for each subband according to the following structure of the second beam:
Figure BDA0001780240230000124
a method for selecting beams in a subband beam set can project on L-4 orthogonal beams by using a difference vector of a subband eigenvector and a broadband eigenvector, and select K-2 strongest projected beams. For example, for subband i, beam 4 and beam 5 are selected among beams {3,4,5,6} (i.e., the second and third beams are selected among the 4 wideband beams, which is used as beam indication information in the subband beam set), then this time there is a beam indication information in the subband beam set
Figure BDA0001780240230000125
A sub-band weighting factor is determined by placing the difference vector at B1And B2The projections on the subband are used as subband weighting factors on the corresponding beams of this subband. E.g. beam B1Has a sub-band weighting factor of
Figure BDA0001780240230000126
Wherein p is0,0Is a sub-band amplitude weighting factor and,
Figure BDA0001780240230000127
is a subband phase weighting factor.
And the terminal feeds back the determined precoding matrix information to the base station. The precoding matrix information comprises indication information of L beams in the broadband beam set (beams 3,4,5,6), and a broadband amplitude weighting factor plAnd wideband phase weighting factor
Figure BDA0001780240230000131
0, …,7 (where l 0, …,3 corresponds to the first polarization direction and l 4, …,7 corresponds to the second polarization direction), a subband amplitude weighting factor p for each subband beam of each layerk,0Sum subband phase weighting factor
Figure BDA0001780240230000132
k is 0, …,3 (where k is 0,1 corresponds to the first polarization direction, k is 2, and 3 corresponds to the second polarization direction). In addition, this scheme also needsAnd reporting the beam indication information in the subband beam set by each subband.
And the base station receives precoding matrix information fed back by the terminal, and generates a precoding matrix according to the formula (1) for data transmission.
In summary, referring to fig. 2, at a terminal side, an information transmission method provided in an embodiment of the present application includes:
s101, determining first precoding matrix information; wherein the first precoding matrix information includes: a wideband weighting coefficient for each beam in a wideband beam set and a subband weighting coefficient for each beam in a subband beam set, wherein each beam in the subband beam set is selected from the wideband beam set;
s102, the rest information except the fixed weighting coefficient appointed by the system in the first precoding matrix information is taken as second precoding matrix information to be sent to a network side.
The fixed weighting factor agreed by the system in the embodiment of the present application may be, for example, a weighting factor agreed by the system to fix the weighting factor corresponding to the beam with the strongest received power to be an amplitude weighting factor of 1 and a phase weighting factor of 0.
In the embodiment of the application, the first precoding matrix information is determined by the method; wherein the first precoding matrix information includes: the wideband weighting factor of each beam in the wideband beam set and the subband weighting factor of each beam in the subband beam set are selected from the wideband beam set, and the rest information except the fixed weighting factor appointed by the system in the first precoding matrix information is used as second precoding matrix information to be sent to a network side, so that the transmission overhead of the precoding matrix information can be reduced.
Optionally, for each polarization direction, after each beam in the wideband beam set is weighted by the wideband weighting coefficient, a first beam of the polarization direction is synthesized; for each polarization direction of each layer, after each beam in the subband beam set is weighted by the subband weighting coefficient, synthesizing a second beam of the polarization direction of the layer, wherein the second beam is a differential beam of the first beam.
Optionally, the wideband weighting factor comprises: a wideband amplitude weighting factor and/or a wideband phase weighting factor for beams in the wideband set of beams.
Optionally, the subband weighting coefficients include: subband amplitude weighting factors and/or subband phase weighting factors for beams in a subband beam set.
Optionally, the precoding matrix information further includes: indication information of beams in the wideband beam set, and/or indication information of beams in the subband beam set.
Optionally, the number of beams in the wideband beam set and/or the number of beams in the subband beam set is determined by the network side and indicated to the terminal; alternatively, the first and second electrodes may be,
and the number of the beams in the subband beam set is determined by the terminal and fed back to the network side.
Correspondingly, referring to fig. 3, on the network side, an information transmission method provided in the embodiment of the present application includes:
s201, receiving second precoding matrix information sent by a terminal; determining first precoding matrix information according to a fixed weighting coefficient agreed by a system; wherein the first precoding matrix information includes: a wideband weighting coefficient for each beam in a wideband beam set and a subband weighting coefficient for each beam in a subband beam set, wherein each beam in the subband beam set is selected from the wideband beam set;
s202, generating a precoding matrix according to the first precoding matrix information.
Optionally, the wideband weighting factor comprises: a wideband amplitude weighting factor and/or a wideband phase weighting factor for beams in the wideband set of beams.
Optionally, the subband weighting coefficients include: subband amplitude weighting factors and/or subband phase weighting factors for beams in a subband beam set.
Optionally, for each polarization direction, after each beam in the wideband beam set is weighted by the wideband weighting coefficient, a first beam of the polarization direction is synthesized; for each polarization direction of each layer, after each beam in the subband beam set is weighted by the subband weighting coefficient, synthesizing a second beam of the polarization direction of the layer, wherein the second beam is a differential beam of the first beam.
Optionally, the precoding matrix W may be constructed by the first beam and the second beam according to the following formula:
Figure BDA0001780240230000151
or
Figure BDA0001780240230000152
Wherein, theta represents the multiplication of corresponding elements,
Figure BDA0001780240230000153
represents kronecker product; l represents the number of beams in the wideband beam set, K represents the number of beams in the subband beam set, BlRepresents the value range of the wave beam L, L in the broadband wave beam set as [0, L]，clA wideband weighting factor representing the corresponding beam, with amplitude as a wideband amplitude weighting factor and phase as a wideband phase weighting factor; subband beam selection matrix EL×K＝[e0 e1 … eK-1]，ekIs a column selection vector with length L, and K has a value range of [0, K]，ai,jThe subband weighting factor representing the beam in the corresponding subband beam set for layer j has amplitude as the subband amplitude weighting factor and phase as the subband phase weighting factor, and i has a value in the range of [0,2K-1 ]]J has a value in the range of [0, r-1 ]]；
Figure BDA0001780240230000161
All 1 directions of 1 row and r columnThe quantity, r, represents the rank of the precoding matrix.
Optionally, the precoding matrix information further includes: indication information for each beam in the wideband beam set, and/or indication information for each beam in the subband beam set.
Optionally, before receiving the precoding matrix information sent by the terminal, the method further includes:
configuring codebook parameter information; the codebook parameter information comprises the number of CSI-RS ports;
and sending the codebook parameter information to the terminal.
Optionally, the codebook parameter information further includes: a number of beams in the wideband beam set and/or a number of beams in the subband beam set.
Referring to fig. 4, at a terminal side, an information transmission apparatus provided in an embodiment of the present application includes:
a determining unit 11, configured to determine first precoding matrix information; wherein the first precoding matrix information includes: a wideband weighting coefficient for each beam in a wideband beam set and a subband weighting coefficient for each beam in a subband beam set, wherein each beam in the subband beam set is selected from the wideband beam set;
a sending unit 12, configured to send the remaining information, except for the fixed weighting coefficient agreed by the system, in the first precoding matrix information to the network side as second precoding matrix information.
Referring to fig. 5, on a network side, an information transmission device provided in an embodiment of the present application includes:
a receiving unit 21, configured to receive second precoding matrix information sent by a terminal; determining first precoding matrix information according to a fixed weighting coefficient agreed by a system; wherein the first precoding matrix information includes: a wideband weighting coefficient for each beam in a wideband beam set and a subband weighting coefficient for each beam in a subband beam set, wherein each beam in the subband beam set is selected from the wideband beam set;
a generating unit 22, configured to generate a precoding matrix according to the first precoding matrix information.
It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The embodiment of the present application provides a computing device, which may specifically be a desktop computer, a portable computer, a smart phone, a tablet computer, a Personal Digital Assistant (PDA), and the like. The computing device may include a Central Processing Unit (CPU), memory, input/output devices, etc., the input devices may include a keyboard, mouse, touch screen, etc., and the output devices may include a Display device, such as a Liquid Crystal Display (LCD), a Cathode Ray Tube (CRT), etc.
The memory may include Read Only Memory (ROM) and Random Access Memory (RAM), and provides the processor with program instructions and data stored in the memory. In the embodiments of the present application, the memory may be used for storing a program of any one of the methods provided by the embodiments of the present application.
The processor is used for executing any one of the methods provided by the embodiment of the application according to the obtained program instructions by calling the program instructions stored in the memory.
Embodiments of the present application provide a computer storage medium for storing computer program instructions for an apparatus provided in the embodiments of the present application, which includes a program for executing any one of the methods provided in the embodiments of the present application.
The computer storage media may be any available media or data storage device that can be accessed by a computer, including, but not limited to, magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND FLASH), Solid State Disks (SSDs)), etc.
Referring to fig. 6, a terminal device provided in an embodiment of the present application includes:
the processor 600, which is used to read the program in the memory 620, executes the following processes:
determining first precoding matrix information; wherein the first precoding matrix information includes: a wideband weighting coefficient for each beam in a wideband beam set and a subband weighting coefficient for each beam in a subband beam set, wherein each beam in the subband beam set is selected from the wideband beam set;
and sending the rest information except the fixed weighting coefficient agreed by the system in the first precoding matrix information as second precoding matrix information to the network side through the transceiver 610.
Optionally, for each polarization direction, after each beam in the wideband beam set is weighted by the wideband weighting coefficient, a first beam of the polarization direction is synthesized; for each polarization direction of each layer, after each beam in the subband beam set is weighted by the subband weighting coefficient, synthesizing a second beam of the polarization direction of the layer, wherein the second beam is a differential beam of the first beam.
Optionally, the wideband weighting factor comprises: a wideband amplitude weighting factor and/or a wideband phase weighting factor for beams in the wideband set of beams.
Optionally, the subband weighting coefficients include: subband amplitude weighting factors and/or subband phase weighting factors for beams in a subband beam set.
Optionally, the precoding matrix information further includes: indication information of beams in the wideband beam set, and/or indication information of beams in the subband beam set.
Optionally, the number of beams in the wideband beam set and/or the number of beams in the subband beam set is determined by the network side and indicated to the terminal; alternatively, the first and second electrodes may be,
and the number of the beams in the subband beam set is determined by the terminal and fed back to the network side.
A transceiver 610 for receiving and transmitting data under the control of the processor 600.
Where in fig. 6, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 600 and memory represented by memory 620. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 610 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. For different user devices, the user interface 630 may also be an interface capable of interfacing with a desired device externally, including but not limited to a keypad, display, speaker, microphone, joystick, etc.
The processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 may store data used by the processor 600 in performing operations.
Alternatively, the processor 600 may be a CPU (central processing unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a CPLD (Complex Programmable Logic Device).
Referring to fig. 7, a network device provided in an embodiment of the present application includes:
the processor 500, which is used to read the program in the memory 520, executes the following processes:
receiving, by the transceiver 510, second precoding matrix information transmitted by the terminal; determining first precoding matrix information according to a fixed weighting coefficient agreed by a system; wherein the first precoding matrix information includes: a wideband weighting coefficient for each beam in a wideband beam set and a subband weighting coefficient for each beam in a subband beam set, wherein each beam in the subband beam set is selected from the wideband beam set;
and generating a precoding matrix according to the first precoding matrix information.
Optionally, the wideband weighting factor comprises: a wideband amplitude weighting factor and/or a wideband phase weighting factor for beams in the wideband set of beams.
Optionally, the subband weighting coefficients include: subband amplitude weighting factors and/or subband phase weighting factors for beams in a subband beam set.
Optionally, for each polarization direction, after each beam in the wideband beam set is weighted by the wideband weighting coefficient, a first beam of the polarization direction is synthesized; for each polarization direction of each layer, after each beam in the subband beam set is weighted by the subband weighting coefficient, synthesizing a second beam of the polarization direction of the layer, wherein the second beam is a differential beam of the first beam.
Optionally, the precoding matrix W may be constructed by the first beam and the second beam according to the following formula:
Figure BDA0001780240230000201
or
Figure BDA0001780240230000202
Wherein, theta represents the multiplication of corresponding elements,
Figure BDA0001780240230000211
represents kronecker product; l represents the number of beams in the wideband beam set, K represents the number of beams in the subband beam set, BlRepresents the value range of the wave beam L, L in the broadband wave beam set as [0, L]，clA wideband weighting factor representing the corresponding beam, with amplitude as a wideband amplitude weighting factor and phase as a wideband phase weighting factor; subband beam selection matrix EL×K＝[e0 e1 … eK-1]，ekIs a column selection vector with length L, and K has a value range of [0, K]，ai,jThe subband weighting factor representing the beam in the corresponding subband beam set for layer j has amplitude as the subband amplitude weighting factor and phase as the subband phase weighting factor, and i has a value in the range of [0,2K-1 ]]J has a value in the range of [0, r-1 ]]；
Figure BDA0001780240230000212
Is a full 1 vector of 1 row and r columns, r representing the rank of the precoding matrix.
Optionally, the precoding matrix information further includes: indication information for each beam in the wideband beam set, and/or indication information for each beam in the subband beam set.
Optionally, before receiving the second precoding matrix information sent by the terminal, the processor is further configured to:
configuring codebook parameter information; the codebook parameter information comprises the number of CSI-RS ports;
and sending the codebook parameter information to the terminal.
Optionally, the codebook parameter information further includes: a number of beams in the wideband beam set and/or a number of beams in the subband beam set.
A transceiver 510 for receiving and transmitting data under the control of the processor 500.
Where in fig. 7, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 500 and memory represented by memory 520. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 510 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 500 is responsible for managing the bus architecture and general processing, and the memory 520 may store data used by the processor 500 in performing operations.
The processor 500 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD).
The method provided by the embodiment of the application can be applied to terminal equipment and also can be applied to network equipment.
The Terminal device may also be referred to as a User Equipment (User Equipment, abbreviated as "UE"), a Mobile Station (Mobile Station, abbreviated as "MS"), a Mobile Terminal (Mobile Terminal), or the like, and optionally, the Terminal may have a capability of communicating with one or more core networks through a Radio Access Network (RAN), for example, the Terminal may be a Mobile phone (or referred to as a "cellular" phone), a computer with Mobile property, or the like, and for example, the Terminal may also be a portable, pocket, hand-held, computer-built-in, or vehicle-mounted Mobile device.
A network device may be a base station (e.g., access point) that refers to a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminals. The base station may be configured to interconvert received air frames and IP packets as a router between the wireless terminal and the rest of the access network, which may include an Internet Protocol (IP) network. The base station may also coordinate management of attributes for the air interface. For example, the Base Station may be a Base Transceiver Station (BTS) in GSM or CDMA, a Base Station (NodeB) in WCDMA, an evolved Node B (NodeB or eNB or e-NodeB) in LTE, or a gNB in 5G system. The embodiments of the present application are not limited.
The above method process flow may be implemented by a software program, which may be stored in a storage medium, and when the stored software program is called, the above method steps are performed.
In summary, the terminal determines and feeds back the wideband beam set and the wideband weighting factor, and determines and feeds back the subband beam set and the subband weighting factor. The beam in the subband beam set is selected from the broadband beam set, and the mode of selecting the beam in the subband beam set can be determined by the terminal and fed back to the base station, or can be appointed by the system. According to the technical scheme provided by the embodiment of the application, the feedback overhead of the Type II codebook can be reduced.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (18)

1. An information transmission method, comprising:
determining first precoding matrix information; wherein the first precoding matrix information includes: a wideband weighting coefficient for each beam in a wideband beam set and a subband weighting coefficient for each beam in a subband beam set, wherein each beam in the subband beam set is selected from the wideband beam set;
and sending the rest information except the fixed weighting coefficient appointed by the system in the first precoding matrix information as second precoding matrix information to a network side.
2. The method of claim 1, wherein for each polarization direction, each beam in the wideband beam set is weighted by the wideband weighting factor to synthesize a first beam for the polarization direction; for each polarization direction of each layer, after each beam in the subband beam set is weighted by the subband weighting coefficient, synthesizing a second beam of the polarization direction of the layer, wherein the second beam is a differential beam of the first beam.
3. The method of claim 1, wherein the wideband weighting factor comprises: a wideband amplitude weighting factor and/or a wideband phase weighting factor for beams in the wideband set of beams.
4. The method of claim 1, wherein the subband weighting coefficients comprise: subband amplitude weighting factors and/or subband phase weighting factors for beams in a subband beam set.
5. The method of claim 1, wherein the precoding matrix information further comprises: indication information of beams in the wideband beam set, and/or indication information of beams in the subband beam set.
6. The method of claim 1, wherein the number of beams in the wideband beam set and/or the number of beams in the subband beam set are determined by a network side and indicated to a terminal; alternatively, the first and second electrodes may be,
and the number of the beams in the subband beam set is determined by the terminal and fed back to the network side.
7. An information transmission method, comprising:
receiving second precoding matrix information sent by a terminal; determining first precoding matrix information according to a fixed weighting coefficient agreed by a system; wherein the first precoding matrix information includes: a wideband weighting coefficient for each beam in a wideband beam set and a subband weighting coefficient for each beam in a subband beam set, wherein each beam in the subband beam set is selected from the wideband beam set;
and generating a precoding matrix according to the first precoding matrix information.
8. The method of claim 7, wherein the wideband weighting factor comprises: a wideband amplitude weighting factor and/or a wideband phase weighting factor for beams in the wideband set of beams.
9. The method of claim 7, wherein the subband weighting coefficients comprise: subband amplitude weighting factors and/or subband phase weighting factors for beams in a subband beam set.
10. The method of claim 7, wherein for each polarization direction, each beam in the wideband beam set is weighted by the wideband weighting factor to synthesize a first beam for the polarization direction; for each polarization direction of each layer, after each beam in the subband beam set is weighted by the subband weighting coefficient, synthesizing a second beam of the polarization direction of the layer, wherein the second beam is a differential beam of the first beam.
11. The method of claim 10, wherein the precoding matrix W is constructed from the first beam and the second beam according to the following formula:
Figure FDA0001780240220000021
or
Figure FDA0001780240220000031
Wherein, theta represents the multiplication of corresponding elements,
Figure FDA0001780240220000032
represents kronecker product; l represents the number of beams in the wideband beam set, K represents the number of beams in the subband beam set, BlRepresents the value range of the wave beam L, L in the broadband wave beam set as [0, L]，clA wideband weighting factor representing the corresponding beam, with amplitude as a wideband amplitude weighting factor and phase as a wideband phase weighting factor; subband beam selection matrix EL×K＝[e0 e1 … eK-1]，ekIs a column selection vector with length L, and K has a value range of [0, K]，ai,jThe subband weighting factor representing the beam in the corresponding subband beam set for layer j has amplitude as the subband amplitude weighting factor and phase as the subband phase weighting factor, and i has a value in the range of [0,2K-1 ]]J has a value in the range of [0, r-1 ]]；
Figure FDA0001780240220000033
Is a full 1 vector of 1 row and r columns, r representing the rank of the precoding matrix.
12. The method of claim 7, wherein the precoding matrix information further comprises: indication information for each beam in the wideband beam set, and/or indication information for each beam in the subband beam set.
13. The method of claim 7, wherein before receiving the precoding matrix information sent by the terminal, the method further comprises:
configuring codebook parameter information; the codebook parameter information comprises the number of CSI-RS ports;
and sending the codebook parameter information to the terminal.
14. The method of claim 13, wherein the codebook parameter information further comprises: a number of beams in the wideband beam set and/or a number of beams in the subband beam set.
15. A computing device, comprising:
a memory for storing program instructions;
a processor for calling program instructions stored in said memory to perform the method of any one of claims 1 to 14 in accordance with the obtained program.
16. An information transmission device characterized by comprising:
a determining unit, configured to determine first precoding matrix information; wherein the precoding matrix information includes: a wideband weighting coefficient for each beam in a wideband beam set and a subband weighting coefficient for each beam in a subband beam set, wherein each beam in the subband beam set is selected from the wideband beam set;
and the sending unit is used for sending the rest information except the fixed weighting coefficient appointed by the system in the first precoding matrix information to a network side as second precoding matrix information.
17. An information transmission device characterized by comprising:
a receiving unit, configured to receive second precoding matrix information sent by a terminal; determining first precoding matrix information according to a fixed weighting coefficient agreed by a system; wherein the first precoding matrix information includes: a wideband weighting coefficient for each beam in a wideband beam set and a subband weighting coefficient for each beam in a subband beam set, wherein each beam in the subband beam set is selected from the wideband beam set;
and the generating unit is used for generating a precoding matrix according to the first precoding matrix information.
18. A computer storage medium having stored thereon computer-executable instructions for causing a computer to perform the method of any one of claims 1 to 14.
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