CN107294880B - Method and apparatus for determining channel information - Google Patents

Method and apparatus for determining channel information Download PDF

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CN107294880B
CN107294880B CN201610196814.6A CN201610196814A CN107294880B CN 107294880 B CN107294880 B CN 107294880B CN 201610196814 A CN201610196814 A CN 201610196814A CN 107294880 B CN107294880 B CN 107294880B
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channel information
csi
antenna ports
transmit antenna
partial
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CN107294880A (en
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李迅
杨涛
张闽
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Nokia Shanghai Bell Co Ltd
Alcatel Lucent SAS
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Nokia Shanghai Bell Co Ltd
Alcatel Lucent SAS
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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
    • 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
    • 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
    • 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]
    • 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
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
    • 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
    • H04B7/0613—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
    • H04B7/0658—Feedback reduction
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • 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
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • 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
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI

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

Abstract

Embodiments of the present disclosure relate to a method and apparatus for determining channel information of a channel. The method includes receiving channel state information reference symbols (CSI-RS) from a base station, the CSI-RS transmitted by the base station using CSI-RS resources mapped to partial transmit antenna ports in an antenna array. The method also includes determining partial channel information for channels corresponding to the partial transmit antenna ports by measuring the CSI-RS. In addition, the method includes determining overall channel information for the channel based on the partial channel information.

Description

Method and apparatus for determining channel information
Technical Field
Embodiments of the present disclosure relate to the field of wireless communications, and more particularly, to a method and apparatus for determining channel information.
Background
Two-dimensional (2D) Multiple Input Multiple Output (MIMO) transmission has been studied and applied to long Term Evolution (L ong Term Evolution, L TE) systems, where a conventional antenna array is arranged horizontally to form beams in the horizontal dimension, furthermore, three-dimensional (3D) MIMO channel transmission models are currently proposed, in order to obtain more potential gain from a 3D wireless channel, 2D active antenna array systems have been used to form 3D beams in the vertical and horizontal dimensions.
However, in the conventional scheme, channel state information reference symbol (CSI-RS) resources are limited to performing full port mapping for transmit antennas. Full port mapping means that the number of CSI-RS resources is equal to the number of transmit antenna ports. In order to obtain complete channel information of a wireless communication channel, it is necessary to transmit a corresponding CSI-RS using each CSI-RS resource mapped to each transmit antenna port. Thus, full-port mapping enables the user equipment to more easily determine channel information of the wireless communication channel, but thereby incurs a large CSI-RS transmission overhead. Furthermore, as the number of transmit antenna ports increases (e.g., from a current maximum of 16 transmit antenna ports to 32 transmit antenna ports that are expected to be reached for 3D MIMO transmission), the CSI-RS transmission overhead will be greater. The conventional scheme cannot effectively reduce the transmission overhead of the CSI-RS.
Disclosure of Invention
Embodiments of the present disclosure provide a method and apparatus for determining channel information of a channel.
According to a first aspect of the present disclosure, a method for determining channel information of a channel is provided. The method includes receiving channel state information reference symbols, CSI-RS, from a base station, the CSI-RS transmitted by the base station using CSI-RS resources mapped to a portion of transmit antenna ports in an antenna array. The method also includes determining partial channel information for channels corresponding to the partial transmit antenna ports by measuring the CSI-RS. In addition, the method includes determining overall channel information for the channel based on the partial channel information.
According to a second aspect of the present disclosure, there is provided an apparatus for determining channel information of a channel. The apparatus includes a reference symbol reception module configured to receive channel state information reference symbols, CSI-RS, from a base station, the CSI-RS transmitted by the base station using CSI-RS resources mapped to partial transmit antenna ports in an antenna array. The apparatus also includes a partial channel information determination module configured to determine partial channel information for channels corresponding to the partial transmit antenna ports by measuring the CSI-RS. Further, the apparatus includes an overall channel information determination module configured to determine overall channel information of the channel based on the partial channel information.
The embodiment of the disclosure can realize the estimation of the channel information based on a partial port mapping method, thereby effectively reducing the CSI-RS transmission overhead in the process.
This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the disclosure, nor is it intended to be used to limit the scope of the disclosure.
Drawings
The foregoing and other objects, features and advantages of the disclosure will be apparent from the following more particular descriptions of exemplary embodiments of the disclosure as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the disclosure.
FIG. 1 illustrates a schematic diagram of an environment 100 in which embodiments of the present disclosure may be implemented;
fig. 2 shows an exemplary schematic diagram of an antenna array 200 with which the base station 110 shown in fig. 1 has;
fig. 3 shows a flow diagram of a method 300 for determining channel information for a channel in accordance with an embodiment of the present disclosure;
fig. 4 shows a schematic diagram of determining overall channel information of a channel based on partial channel information according to an embodiment of the present disclosure;
fig. 5 shows a schematic diagram of determining overall channel information of a channel based on partial channel information according to an embodiment of the present disclosure;
fig. 6 shows a schematic diagram of determining overall channel information of a channel based on partial channel information according to an embodiment of the present disclosure;
fig. 7 shows a schematic diagram of determining overall channel information of a channel based on partial channel information according to an embodiment of the present disclosure;
fig. 8 illustrates a schematic diagram of determining overall channel information of a channel based on partial channel information according to an embodiment of the present disclosure;
fig. 9 illustrates a schematic diagram of determining overall channel information of a channel based on partial channel information according to an embodiment of the present disclosure;
fig. 10 illustrates a schematic diagram of determining overall channel information of a channel based on partial channel information according to an embodiment of the present disclosure; and
fig. 11 shows a block diagram of an apparatus 1100 for determining channel information of a channel according to an embodiment of the present disclosure.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The term "include" and variations thereof as used herein is meant to be inclusive in an open-ended manner, i.e., "including but not limited to". Unless specifically stated otherwise, the term "or" means "and/or". The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like may refer to different or the same object. Other explicit and implicit definitions are also possible below.
In an embodiment of the present disclosure, the term "CSI-RS resource" denotes a time and/or frequency domain resource for transmitting CSI-RS. The term "CSI-RS configuration resource" denotes a set of multiple CSI-RS resources. The term "CSI process" denotes a process triggered by the base station 110 for obtaining Channel State Information (CSI). The CSI processes may also be periodic and different CSI processes may be set with different transmission periods.
In conventional schemes, CSI-RS resource aggregation is typically required in order to extend a smaller number (e.g., 1, 2, 4, or 8) of antenna ports to support a larger number (e.g., 12, 16) of antenna ports. CSI-RS resource aggregation means that several CSI-RS resources corresponding to fewer antenna ports are aggregated to form new CSI-RS resources corresponding to more antenna ports. This method is called full-port mapping based method, which means that there is a one-to-one mapping relationship between CSI-RS resources and transmit antenna ports.
However, in the current L TE standard (e.g., Release 13), the total number of available CSI-RS resource elements is 40. these CSI-RS resource elements will be used for both channel information estimation and interference measurement.32 is the number of transmit antenna ports that 3D MIMO transmission is expected to reach.
To address one or more of the above issues and other potential issues, in accordance with an embodiment of the present disclosure, a scheme for determining channel information is presented. The scheme realizes the estimation of the channel information based on a partial port mapping method, thereby effectively reducing the CSI-RS transmission overhead in the process.
Fig. 1 shows a schematic diagram of an environment 100 in which embodiments of the present disclosure may be implemented, as shown in fig. 1, the environment 100 includes a base station 110 and a UE120, both communicating via a wireless communication channel, the base station 110 may include, for example, an L TE system evolved node B (eNB) in the context of the present disclosure, a base station "(BS) may represent a node B (NodeB or NB), an evolved node B (eNodeB or eNB), a Remote Radio Unit (RRU), a Radio Head (RH), a Remote Radio Head (RRH), a relay, a low power node such as a pico base station, a femto base station, etc.' user equipment" (UE) refers to any device capable of communicating with the BS.
To obtain Channel State Information (CSI) for a wireless communication channel, the base station 110 may transmit a CSI-RS to the UE 120. The UE120 may receive the CSI-RS from the base station 110 and determine channel information for the channel by measuring the CSI-RS. The channel information may describe an attenuation factor of the signal on each transmission path of the channel. Based on the channel information, the UE120 may obtain CSI for the channel using a corresponding codebook and feed back the CSI to the base station 110. The CSI may provide reliability guarantees for wireless communications between the base station 110 and the UE 120. The above-described process is referred to herein as a "CSI process".
The base station 110 typically has multiple transmit antennas, which may constitute a 2D active antenna array. The base station 110 may transmit CSI-RS to the UE120 using CSI-RS resources mapped to antenna ports in the antenna array. Each transmit antenna port corresponds to a transmission path of a signal. Therefore, in order to reconstruct the overall wireless channel (i.e., to obtain the attenuation factors on each transmission path), the UE120 needs to determine the overall channel information corresponding to all transmit antenna ports.
Fig. 2 shows an exemplary schematic diagram of an antenna array 200 provided by the base station 110 shown in fig. 1, for example, the antenna array is composed of M × N transmitting antennas with dual polarization (i.e., vertical polarization and horizontal polarization), so that the antenna array has 2MN transmitting antenna ports in total, as shown in fig. 2, if the transmitting antenna ports with one of the two polarizations among the transmitting antenna ports are numbered column by column, and then the transmitting antenna ports with the other of the two polarizations among the transmitting antenna ports are numbered column by column, the overall channel information corresponding to all the transmitting antenna ports, which the UE120 needs to determine, can be represented as H ═ H [ H ]1,h2,…,h2MN]. Wherein H represents overall channel information of the channel, and Hn(n-1, 2, … … 2MN) indicates channel information corresponding to the nth transmission antenna port.
Fig. 3 shows a flow diagram of a method 300 for determining channel information for a channel in accordance with an embodiment of the present disclosure. The method 300 will be described below primarily with reference to the environment 100 as shown in fig. 1 and the antenna array 200 as shown in fig. 2. For example, the method 300 may be performed by the UE120 as shown in fig. 1. It should be understood that the method 300 may also include additional steps not shown and/or may omit the steps shown. The scope of the present disclosure is not limited in this respect.
The method 300 begins at step 310. In step 310, the CSI-RS from the base station 110 is received by the UE120, which is transmitted by the base station 110 using CSI-RS resources mapped to partial transmit antenna ports in the antenna array 200.
Next, method 300 proceeds toStep 320. In step 320, the UE120 determines partial channel information of channels corresponding to the partial transmit antenna ports by measuring the CSI-RS. For example, the partial channel information may be expressed as
Figure BDA0000955414170000061
In step 330, the UE120 determines overall channel information of the channel based on the partial channel information. For example, in one embodiment, the overall channel information H of a channel may be calculated using equation (1) as follows:
Figure BDA0000955414170000062
where ζ (·) represents a partial channel information reconstruction function, which may be a linear synthesis operation, a product operation (e.g., a kronecker product), and so on.
For purposes of illustration and example only, the method 300 will be described in further detail below in connection with some specific embodiments. In one embodiment, a CSI-RS from the base station 110 may be received by the UE120, which may be transmitted by the base station 110 using the first CSI-RS resource and the second CSI-RS resource (310). The first CSI-RS resource may be mapped to a column of transmit antenna ports in the antenna array 200 and the second CSI-RS resource may be mapped to a row of transmit antenna ports in the antenna array 200. Thus, the UE120 may determine the first partial channel information corresponding to the column of transmit antenna ports by measuring the CSI-RS
Figure BDA0000955414170000063
And a second portion of channel information corresponding to the row of transmit antenna ports
Figure BDA0000955414170000064
(320)。
Next, UE120 may calculate the first partial channel information
Figure BDA0000955414170000065
And a second partial channelInformation processing device
Figure BDA0000955414170000066
The product (e.g., kronecker product) to determine overall channel information H (330). For example, fig. 4 shows a schematic diagram of determining overall channel information of a channel based on partial channel information according to an embodiment of the present disclosure. As shown in figure 4 of the drawings,
Figure BDA0000955414170000067
and is
Figure BDA0000955414170000068
The overall channel information H can be calculated according to the following formula (2):
Figure BDA0000955414170000069
in this embodiment, if the first CSI-RS resource and the second CSI-RS resource are included in the same CSI-RS configuration resource, the total number of CSI-RSs transmitted using the first CSI-RS resource and the second CSI-RS resource is M +2N-1 (less than the total number of antenna ports, 2 MN). The total number of CSI-RSs transmitted using the first CSI-RS resource and the second CSI-RS resource is M +2N (also less than the total number of antenna ports, 2MN) if the first CSI-RS resource and the second CSI-RS resource are included in different CSI-RS configuration resources.
In another embodiment, the CSI-RS from the base station 110 may be received by the UE120, which may be transmitted by the base station 110 using the third CSI-RS resource, the fourth CSI-RS resource, and the fifth CSI-RS resource (310). A third CSI-RS resource may be mapped to a row of transmit antenna ports in antenna array 200, a fourth CSI-RS resource may be mapped to a first set of transmit antenna ports in a column of transmit antenna ports having one of two polarizations, and a fifth CSI-RS resource may be mapped to a second set of transmit antenna ports in a column of transmit antenna ports having the other of the two polarizations. Thus, UE120 may determine a third portion of channel information corresponding to the row of transmit antenna ports
Figure BDA0000955414170000071
A fourth portion of channel information corresponding to the first set of transmit antenna ports
Figure BDA0000955414170000072
And fifth partial channel information corresponding to the second set of transmit antenna ports
Figure BDA0000955414170000073
(320)。
Then, the UE120 may base on the third partial channel informationFourth partial channel information
Figure BDA0000955414170000075
And fifth partial channel information
Figure BDA0000955414170000076
The overall channel information H is determined by calculating the product (330). For example, in some embodiments, a kronecker product may be applied. Of course, this is merely an example and any other currently known or future developed product calculation may be used in conjunction with embodiments of the present disclosure.
For example, fig. 5 shows a schematic diagram of determining overall channel information of a channel based on partial channel information according to an embodiment of the present disclosure. As shown in figure 5 of the drawings,
Figure BDA0000955414170000077
Figure BDA0000955414170000078
and is
Figure BDA0000955414170000079
The z-ensemble channel information H can be calculated according to equation (3) as follows:
Figure BDA00009554141700000710
in this embodiment, if the third, fourth, and fifth CSI-RS resources are included in the same CSI-RS configuration resource, the total number of CSI-RSs transmitted using the third, fourth, and fifth CSI-RS resources is 2M + N-1 (less than the total number of antenna ports, 2 MN). If the third, fourth and fifth CSI-RS resources are included in different CSI-RS configuration resources, a total number of CSI-RSs transmitted using the third, fourth and fifth CSI-RS resources is 2M + N (also less than a total number of antenna ports, 2 MN).
Alternatively or additionally, in yet another embodiment, the CSI-RS from the base station 110 may be received by the UE120, which may be transmitted by the base station 110 using a sixth CSI-RS resource mapped to the third set of transmit antenna ports and a seventh CSI-RS resource mapped to the fourth set of transmit antenna ports (310). The third set of transmit antenna ports is distributed in a first antenna block of the antenna array 200 and the fourth set of transmit antenna ports is distributed in a second antenna block of the antenna array 200, wherein the first antenna block is larger than the second antenna block. Thus, UE120 may determine a sixth portion of channel information corresponding to a third set of antenna ports
Figure BDA0000955414170000081
And a seventh portion of channel information corresponding to a fourth set of transmit antenna ports
Figure BDA0000955414170000082
(320)。
Next, the UE120 may calculate the sixth partial channel information
Figure BDA0000955414170000083
And seventh partial channel information
Figure BDA0000955414170000084
The product (e.g., kronecker product) to determine overall channel information H (330). For example, FIG. 6 illustrates an embodiment in accordance with the present disclosureA schematic diagram of determining overall channel information of a channel based on partial channel information. As shown in fig. 6, the overall channel information H can be calculated according to the following equation (4):
Figure BDA0000955414170000085
in this embodiment, if the sixth CSI-RS resource and the seventh CSI-RS resource are included in the same CSI-RS configuration resource, the total number of CSI-RSs transmitted using the sixth CSI-RS resource and the seventh CSI-RS resource is 2M 'N' + MN/M 'N' -1 (less than the total number of antenna ports 2MN), where M 'indicates the number of antenna blocks divided in each column, N' indicates the number of antenna blocks divided in each row, and M 'and N' are both greater than or equal to 1. If the sixth and seventh CSI-RS resources are included in different CSI-RS configuration resources, the total number of CSI-RSs transmitted using the sixth and seventh CSI-RS resources is 2M 'N' + MN/M 'N' (also less than the total number of antenna ports, 2 MN).
In another embodiment, CSI-RS from the base station 110 may be received by the UE120, which may be transmitted by the base station 110 using multiple sets of CSI-RS resources respectively mapped to multiple sets of transmit antenna ports (310). Each of the sets of transmit antenna ports may include a column of transmit antenna ports, a row of transmit antenna ports, a block of transmit antenna ports, or interleaved transmit antenna ports. Thus, UE120 may determine a plurality of partial channel information respectively corresponding to a plurality of sets of transmit antenna ports
Figure BDA0000955414170000091
… … (320). Next, the UE120 may transmit the plurality of partial channel information
Figure BDA0000955414170000092
… … apply linear synthesis to determine the overall channel information H (330). For example, the overall channel information H may be calculated according to the following equation (5):
Figure BDA0000955414170000093
wherein
Figure BDA0000955414170000094
Has the same dimension as H, an
Figure BDA0000955414170000095
Of elements corresponding to only a subset of transmit antenna ports (i.e., one of the sets of transmit antenna ports) has a value of channel information (e.g., h) determined by CSI-RS measurementsCSI-RS) And the values of the remaining elements are 0. That is to say that the first and second electrodes,
Figure BDA0000955414170000096
can be expressed as equation (6) below:
Figure BDA0000955414170000097
Figure BDA0000955414170000098
as an example, fig. 7 to 10 respectively show diagrams of determining overall channel information of a channel based on partial channel information according to an embodiment of the present disclosure. In fig. 7, each of the sets of transmit antenna ports is a row of transmit antenna ports. In fig. 8, each of the plurality of sets of transmit antenna ports is a column of transmit antenna ports. In fig. 9, each of the sets of transmit antenna ports is a block of transmit antenna ports. In fig. 10, each of the sets of transmit antenna ports is an interleaved transmit antenna port.
Further, with respect to the above-described embodiment in which linear synthesis is applied to determine the overall channel information, the overall channel information may also be determined on the base station side in some cases. An additional inter-subset Precoding Matrix Indication (PMI) should be fed back from the UE to the base station to indicate the correlation between each subset. At the UE side, PMI _ k may indicate a PMI selected from a codebook using partial channel information from a subset k of transmit antenna ports, and a codeword may be used
Figure BDA0000955414170000099
To represent; PMI _ inter can indicate channel information between subsets of transmit antenna ports, which can be from the first or other transmit antenna ports of each subset, and a codeword can be used
Figure BDA00009554141700000910
Therefore, on the base station side, the overall channel information H can be expressed as the following formula (7):
Figure BDA00009554141700000911
Figure BDA0000955414170000101
Figure BDA0000955414170000102
wherein the index (m, n) represents an antenna port index in the antenna array and the index (i, j) indicates a corresponding channel measurement in the subset of antenna ports.
Figure BDA0000955414170000103
Indicating code word
Figure BDA0000955414170000104
The ith element of (1).
In some embodiments, method 300 may also include optional additional steps. For example, in some implementations, after performing step 330, the UE120 may also determine first CSI corresponding to the partial channel information and feed back the first CSI to the base station 110. The first CSI may include, for example, a PMI and the like. The codebook used for PMI feedback should support the number of partial transmit antenna ports. Corresponding narrowband Channel Quality Indication (CQI) and Rank Indication (RI) feedback may be calculated from the partial channel information determined in each CSI process and fed back to the base station 110.
Additionally or alternatively, the UE120 may also determine second CSI corresponding to the overall channel information and feed the second CSI back to the base station 110. The second CSI may include, for example, PMI, CQI, and RI, etc. The codebook used for PMI feedback should support the number of all transmit antenna ports. Since different CSI processes may be set with different periodicities, when the UE120 is set to feed back the second CSI corresponding to the overall channel information, the feedback rate may be the same as the CSI-RS transmission with the shorter periodicity, while the channel information from the CSI-RS transmission with the longer periodicity will be reused until the channel information is updated.
In some embodiments, the CSI feedback may be set as a mixture of full port mapping based CSI processes with longer periods and partial port mapping based CSI processes with shorter periods. In the case where the entire information is reconstructed and applied at the UE120 side, the UE120 feeds back CSI based on the reconstructed channel information, which can be expressed as formula (8) as follows:
Figure BDA0000955414170000105
where H (t) represents the overall channel information at time slot (frame) t, and the function {. cndot.) represents the channel information according to time slot t1And t2Partial channel information of one or more groups of antenna ports. An example can be represented by equation (9) below, where D {. cndot } represents a vector diagonalization operation:
Figure BDA0000955414170000111
Figure BDA0000955414170000112
taking the antenna configuration example shown in fig. 7, a full port mapping based CSI process with a longer period may involve antenna port subsets #1- # 4. CSI feedback may be performed based on overall channel information using a corresponding codebook or other CSI indicator. A full port mapping based CSI process with shorter periodicity may only involve antenna port subset #1 (or any other subset of antenna ports). CSI feedback may be performed based on partial channel information using a corresponding codebook or other CSI indicator.
In some embodiments, for example where the UE feeds back CSI based on independent partial channel information, PMI feedback should be applied to each CSI process with a codebook supporting a corresponding number of antenna ports, in which case H (t)1) And H (t)2) Can be expressed as the following formulas (10) and (11), respectively
H(t1)=W1(t1)W2(t2) (10)
H(t2)=W1(t1){W2(t1),W′(t2)} (11)
Wherein the function {. denotes the codeword adjustment method according to W ', and W' denotes feedback according to short-term partial channel information. W1W2The structure may be an existing dual PMI feedback codebook result, whereas if a single PMI is set:
H(t1)＝W(t1) (12)
H(t2)＝{W(t1),W′(t2)} (13)
still taking the example of the antenna configuration shown in fig. 7, a full port mapping based CSI process with longer periodicity may involve antenna port subsets #1- # 4. CSI feedback may be performed based on overall channel information using a corresponding codebook or other CSI indicator. A full-port mapping based CSI process with a shorter periodicity may involve only a pair of dual polarized antenna ports (same location, different polarization). Short-term CSI feedback may be performed with corresponding codebooks or other CSI indicators that reflect channel variations between antenna polarizations. The base station will then adjust W or W according to the feedback W2。
In the above embodiments, additionally or alternatively, the CSI process based on full port mapping may be triggered by the base station aperiodically, and the CSI-RS measurement based on partial port mapping with a shorter period may be a periodic CSI process or may also be triggered by the base station aperiodically. Such a configuration may be semi-statically configured via higher layer signaling or may be carried by a trigger (e.g., a base station).
It should be appreciated that for the various embodiments described above in connection with fig. 1-10, a new CSI feedback mode may also be defined in order to perform base station and UE side operations in a single CSI process. As can be seen from the above-described embodiments, the scheme of the present disclosure can implement estimation on channel information based on a partial port mapping method, so that CSI-RS transmission overhead in this process can be effectively reduced.
Fig. 11 shows a block diagram of an apparatus 1100 for determining channel information of a channel according to an embodiment of the present disclosure. As shown in fig. 11, the apparatus 1100 may include a reference symbol reception module 1110 configured to receive CSI-RS from the base station 110, the CSI-RS transmitted by the base station 110 using CSI-RS resources mapped to partial transmit antenna ports in the antenna array 200. The device 1100 may further include a partial channel information determination module 1120 configured to determine partial channel information of channels corresponding to partial transmit antenna ports by measuring CSI-RS. Further, the device 1100 may also include an overall channel information determination module 1130 configured to determine overall channel information for the channel based on the partial channel information.
For clarity, certain optional modules of the device 1100 are not shown in fig. 11. However, it should be understood that the various features described above with reference to fig. 1-10 apply equally to the apparatus 1100. Also, each of the devices 1100 may be a hardware module or a software module. For example, in some embodiments, device 1100 may be implemented in part or in whole using software and/or firmware, e.g., as a computer program product embodied on a computer-readable medium. Alternatively or additionally, the device 1100 may be implemented partially or wholly in hardware, e.g., as an Integrated Circuit (IC), an Application Specific Integrated Circuit (ASIC), a system on a chip (SOC), a Field Programmable Gate Array (FPGA), or the like. The scope of the present disclosure is not limited in this respect.
In particular, the means shown in fig. 4 may be implemented partially or wholly as hardware modules, software modules, firmware modules, or any combination thereof. In particular, in certain embodiments, the procedures, methods or processes described above may be implemented by hardware in the UE or the base station. For example, the UE may implement the method 300 with its transmitter, receiver, transceiver, and/or processor or controller.
The present disclosure may be systems, methods, and/or computer program products. The computer program product may include a computer-readable storage medium having computer-readable program instructions embodied thereon for carrying out various aspects of the present disclosure.
The computer readable storage medium may be a tangible device that can hold and store the instructions for use by the instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a Static Random Access Memory (SRAM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical coding device, such as punch cards or in-groove projection structures having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media as used herein is not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission medium (e.g., optical pulses through a fiber optic cable), or electrical signals transmitted through electrical wires.
The computer-readable program instructions described herein may be downloaded from a computer-readable storage medium to a respective computing/processing device, or to an external computer or external storage device via a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. The network adapter card or network interface in each computing/processing device receives computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in the respective computing/processing device.
Computer program instructions for carrying out operations of the present disclosure may be assembler instructions, Instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including AN object oriented programming language such as Smalltalk, C + +, or the like, as well as conventional procedural programming languages, such as the "C" language or similar programming languages.
Various aspects of the present disclosure are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.
These computer-readable program instructions may be provided to a processing unit of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processing unit of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer-readable program instructions may also be stored in a computer-readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer-readable medium storing the instructions comprises an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer, other programmable apparatus or other devices implement the functions/acts specified in the flowchart and/or block diagram block or blocks.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (20)

1. A method for determining channel information for a channel, comprising:
receiving a channel state information reference symbol, CSI-RS, from a base station, the CSI-RS transmitted by the base station using CSI-RS resources mapped to partial transmit antenna ports in an antenna array;
determining partial channel information for the channels corresponding to the partial transmit antenna ports by measuring the CSI-RS; and
determining overall channel information of the channel based on the partial channel information,
wherein the partial transmit antenna ports comprise any of:
a plurality of sets of transmit antenna ports determined based on different polarizations in response to the CSI-RS being transmitted by the base station using a third CSI-RS resource mapped to a row of transmit antenna ports in the antenna array, a fourth CSI-RS resource mapped to a first set of transmit antenna ports in a column of transmit antenna ports having one of the two polarizations, and a fifth CSI-RS resource mapped to a second set of transmit antenna ports in the column of transmit antenna ports having the other of the two polarizations;
a plurality of sets of transmit antenna ports determined based on different antenna blocks of the antenna array in response to the CSI-RS being transmitted by the base station using a sixth CSI-RS resource mapped to a third set of transmit antenna ports distributed in a first antenna block of the antenna array and a seventh CSI-RS resource mapped to a fourth set of transmit antenna ports distributed in a second antenna block of the antenna array, the first antenna block being larger than the second antenna block; or
Non-overlapping sets of transmit antenna ports.
2. The method of claim 1, wherein determining partial channel information corresponding to the partial transmit antenna ports comprises:
determining a third partial channel information corresponding to the row of transmit antenna ports;
determining a fourth portion of channel information corresponding to the first set of transmit antenna ports; and
determining fifth partial channel information corresponding to the second set of transmit antenna ports.
3. The method of claim 2, wherein determining overall channel information comprises:
determining the overall channel information by calculating a product based on the third partial channel information, the fourth partial channel information, and the fifth partial channel information.
4. The method of claim 1, wherein determining partial channel information corresponding to the partial transmit antenna ports comprises:
determining a sixth portion of channel information corresponding to the third set of antenna ports; and
determining a seventh portion of channel information corresponding to the fourth set of transmit antenna ports.
5. The method of claim 4, wherein determining overall channel information comprises:
determining the overall channel information by calculating a product of the sixth partial channel information and the seventh partial channel information.
6. The method of claim 1, wherein the CSI-RS are transmitted by the base station using multiple sets of CSI-RS resources respectively mapped to non-overlapping sets of transmit antenna ports, and determining partial channel information corresponding to the partial transmit antenna ports comprises:
determining a plurality of partial channel information respectively corresponding to the plurality of groups of transmit antenna ports.
7. The method of claim 6, wherein determining overall channel information comprises:
determining the overall channel information by applying a linear synthesis to the plurality of partial channel information.
8. The method of claim 1, further comprising:
determining at least one of:
first channel state information corresponding to the partial channel information; and
second channel state information corresponding to the overall channel information.
9. The method of claim 8, further comprising:
feeding back at least one of the first channel state information and the second channel state information to the base station.
10. The method of claim 9, further comprising:
feeding back the first channel state information with a first periodicity; and
feeding back the second channel state information with a second periodicity, the second periodicity being greater than the first periodicity.
11. An apparatus for determining channel information for a channel, comprising:
a reference symbol receiving module configured to receive a channel state information reference symbol, CSI-RS, from a base station, the CSI-RS transmitted by the base station using CSI-RS resources mapped to partial transmit antenna ports in an antenna array;
a partial channel information determination module configured to determine partial channel information of the channel corresponding to the partial transmit antenna ports by measuring the CSI-RS; and
an overall channel information determination module configured to determine overall channel information of the channel based on the partial channel information,
wherein the partial transmit antenna ports comprise any of:
a plurality of sets of transmit antenna ports determined based on different polarizations in response to the CSI-RS being transmitted by the base station using a third CSI-RS resource mapped to a row of transmit antenna ports in the antenna array, a fourth CSI-RS resource mapped to a first set of transmit antenna ports in a column of transmit antenna ports having one of the two polarizations, and a fifth CSI-RS resource mapped to a second set of transmit antenna ports in the column of transmit antenna ports having the other of the two polarizations;
a plurality of sets of transmit antenna ports determined based on different antenna blocks of the antenna array in response to the CSI-RS being transmitted by the base station using a sixth CSI-RS resource mapped to a third set of transmit antenna ports distributed in a first antenna block of the antenna array and a seventh CSI-RS resource mapped to a fourth set of transmit antenna ports distributed in a second antenna block of the antenna array, the first antenna block being larger than the second antenna block; or
Non-overlapping sets of transmit antenna ports.
12. The apparatus of claim 11, wherein the partial channel information determination module is further configured to:
determining a third partial channel information corresponding to the row of transmit antenna ports;
determining a fourth portion of channel information corresponding to the first set of transmit antenna ports; and
determining fifth partial channel information corresponding to the second set of transmit antenna ports.
13. The apparatus of claim 12, wherein the overall channel information determination module is further configured to:
determining the overall channel information by calculating a product based on the third partial channel information, the fourth partial channel information, and the fifth partial channel information.
14. The apparatus of claim 11, wherein the partial channel information determination module is further configured to:
determining a sixth portion of channel information corresponding to the third set of antenna ports; and
determining a seventh portion of channel information corresponding to the fourth set of transmit antenna ports.
15. The apparatus of claim 14, wherein the overall channel information determination module is further configured to:
determining the overall channel information by calculating a product of the sixth partial channel information and the seventh partial channel information.
16. The apparatus of claim 11, wherein the CSI-RS are transmitted by the base station using sets of CSI-RS resources respectively mapped to non-overlapping sets of transmit antenna ports, and the partial channel information determination module is further configured to:
determining a plurality of partial channel information respectively corresponding to the plurality of groups of transmit antenna ports.
17. The apparatus of claim 16, wherein the overall channel information determination module is further configured to:
determining the overall channel information by applying a linear synthesis to the plurality of partial channel information.
18. The apparatus of claim 11, further comprising:
a channel state information determination module configured to determine at least one of:
first channel state information corresponding to the partial channel information; and
second channel state information corresponding to the overall channel information.
19. The apparatus of claim 18, further comprising:
a channel state information feedback module configured to feedback at least one of the first channel state information and the second channel state information to the base station.
20. The apparatus of claim 19, wherein the channel state information feedback module is further configured to:
feeding back the first channel state information with a first periodicity; and
feeding back the second channel state information with a second periodicity, the second periodicity being greater than the first periodicity.
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