CN113366787A - Method, apparatus, and computer-readable medium for estimating channel state information - Google Patents

Method, apparatus, and computer-readable medium for estimating channel state information Download PDF

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CN113366787A
CN113366787A CN201980089248.0A CN201980089248A CN113366787A CN 113366787 A CN113366787 A CN 113366787A CN 201980089248 A CN201980089248 A CN 201980089248A CN 113366787 A CN113366787 A CN 113366787A
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network device
antennas
terminal device
csi
antenna
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CN113366787B (en
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R·阿赫麦德·萨勒姆
孙欢
E·维索特斯基
F·福克
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Nokia Shanghai Bell Co Ltd
Nokia Oyj
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Nokia Shanghai Bell Co Ltd
Nokia Networks Oy
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals

Abstract

Embodiments of the present disclosure provide methods, devices, and computer-readable media for estimating control state information. According to embodiments of the present disclosure, CSI is estimated by SRS sounding on a reference antenna instead of CSI feedback. In this way, overhead is reduced.

Description

Method, apparatus, and computer-readable medium for estimating channel state information
Technical Field
Embodiments of the present disclosure relate generally to communication technology and, more particularly, relate to a method, apparatus, and computer-readable medium for estimating channel state information.
Background
In a wireless communication system, Channel State Information (CSI) describes how a signal propagates from a transmitter to a receiver. In particular, downlink CSI is critical for base stations (e.g., gbnodebs (gnbs)) in multiple-input multiple-output (MIMO) systems. The gNB performs downlink transmission and scheduling according to the CSI. In Frequency Division Duplex (FDD) systems, the terminal device needs to feed back downlink CSI to the base station since the Uplink (UL) and downlink channels are not on the same frequency. In Time Division Duplex (TDD) systems, UL-downlink reciprocity is exploited.
Disclosure of Invention
In general, embodiments of the present disclosure relate to a method for estimating channel state information and feeding back CSI to a base station and a corresponding communication device.
In a first aspect, embodiments of the present disclosure provide a network device. The network device includes at least one processor; and a memory coupled to the at least one processor, the memory storing instructions therein, the instructions when executed by the at least one processor causing the network device to: measurement of a Sounding Reference Signal (SRS) is performed on at least one reference antenna selected from a plurality of antennas of a terminal device. The network device is further caused to determine a channel response between the network device and the at least one reference antenna based on the measurements. The network device is also caused to receive phase information associated with the plurality of antennas from the terminal device. The network device is further caused to generate an estimate of Channel State Information (CSI) between the network device and the plurality of antennas based on the phase information and the channel response.
In a second aspect, embodiments of the present disclosure provide a terminal device. The terminal device includes: at least one processor; and a memory coupled to the at least one processor, the memory storing instructions therein, the instructions when executed by the at least one processor causing the terminal device to: sounding Reference Signals (SRSs) are transmitted to the network device using a plurality of antennas of the terminal device to obtain, by the network device, a channel response between at least one reference antenna and the network device. The terminal device is also caused to transmit phase information associated with the plurality of antennas to the network device. The terminal device is also caused to receive a downlink transmission from the network device, the downlink transmission based on Channel State Information (CSI) between the network device and the plurality of antennas. The CSI is estimated based on the channel response and the phase information.
In a third aspect, embodiments of the present disclosure provide a method. The method comprises the following steps: at a network device, measurements of Sounding Reference Signals (SRSs) are performed on at least one reference antenna selected from a plurality of antennas of a terminal device. The method also includes determining a channel response between the network device and the at least one reference antenna based on the measurements. The method further includes receiving phase information associated with the plurality of antennas from the terminal device. The method also includes generating an estimate of Channel State Information (CSI) between the network device and the plurality of antennas based on the phase information and the channel response.
In a fourth aspect, embodiments of the present disclosure provide a method. The method comprises the following steps: sounding Reference Signals (SRSs) are transmitted to the network device using a plurality of antennas of the terminal device to obtain, by the network device, a channel response between at least one reference antenna and the network device. The method further includes transmitting phase information associated with the plurality of antennas to a network device. The method also includes receiving a downlink transmission from the network device, the downlink transmission based on Channel State Information (CSI) between the network device and the plurality of antennas. The CSI is estimated based on the channel response and the phase information.
In a fifth aspect, embodiments of the present disclosure provide an apparatus for communication. The apparatus includes means for performing Sounding Reference Signal (SRS) measurements on at least one reference antenna selected from a plurality of antennas of a terminal device. The apparatus also includes means for determining a channel response between the network device and at least one reference antenna based on the measurements. The apparatus also includes means for receiving phase information associated with the plurality of antennas from the terminal device. The apparatus further includes means for generating an estimate of Channel State Information (CSI) between the network device and the plurality of antennas based on the phase information and the channel response.
In a sixth aspect, embodiments of the present disclosure provide an apparatus for communication. The apparatus includes means for transmitting, with a plurality of antennas of a terminal device, a Sounding Reference Signal (SRS) to a network device to obtain, by the network device, a channel response between at least one reference antenna and the network device. The apparatus also includes means for transmitting phase information associated with the plurality of antennas to a network device. The apparatus also includes means for receiving a downlink transmission from the network device, the downlink transmission based on Channel State Information (CSI) between the network device and the plurality of antennas. The CSI is estimated based on the channel response and the phase information.
In a seventh aspect, embodiments of the present disclosure provide a computer-readable medium. The computer readable medium has stored thereon instructions which, when executed by at least one processing unit of the machine, cause the machine to carry out the method according to the third and fourth aspects.
Other features and advantages of embodiments of the present disclosure will also be apparent from the following description of specific embodiments, when read in conjunction with the accompanying drawings which illustrate, by way of example, the principles of embodiments of the disclosure.
Drawings
Embodiments of the present disclosure are presented by way of example, and their advantages are explained in more detail below with reference to the accompanying drawings, in which
Fig. 1 shows a schematic diagram of a communication system according to an embodiment of the present disclosure;
FIG. 2 shows a schematic diagram of a terminal device with multiple antennas according to an embodiment of the disclosure;
fig. 3 illustrates a flow diagram of a method implemented at a communication device in accordance with an embodiment of the present disclosure;
fig. 4 shows a flow diagram of a method implemented at a communication device in accordance with an embodiment of the present disclosure; and
fig. 5 shows a schematic diagram of an apparatus according to an embodiment of the present disclosure.
Throughout the drawings, the same or similar reference numbers refer to the same or similar elements.
Detailed Description
The subject matter described herein will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only for the purpose of enabling those skilled in the art to better understand and thereby implement the subject matter described herein, and do not set forth any limitations on the scope of the subject matter.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be noted that, in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two functions or acts shown in succession may, in fact, be executed substantially concurrently, or the functions/acts may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
As used herein, the term "communication network" refers to a network that conforms to any suitable communication standard, such as Long Term Evolution (LTE), LTE-advanced (LTE-a), Wideband Code Division Multiple Access (WCDMA), High Speed Packet Access (HSPA), and the like. Further, communication between the terminal device and the network devices in the communication network may be performed according to any suitable generation communication protocol, including but not limited to first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, future fifth generation (5G) communication protocols, and/or any other protocol currently known or to be developed in the future.
Embodiments of the present disclosure may be applied to various communication systems. Given the rapid development of communications, there will, of course, also be future types of communication techniques and systems that may embody the present disclosure. The scope of the present disclosure should not be limited to only the above-described systems. For purposes of illustration, embodiments of the present disclosure will be described with reference to a 5G communication system.
The term "network device" as used herein includes, but is not limited to, Base Stations (BSs), gateways, registration management entities, and other suitable devices in a communication system. The term "base station" or "BS" denotes a node B (NodeB or NB), evolved NodeB (eNodeB or eNB), NR NB (also known as gbb), Remote Radio Unit (RRU), Radio Header (RH), Remote Radio Head (RRH), relay, low power node (e.g., femto, pico, etc.).
The term "terminal device" as used herein includes, but is not limited to, "User Equipment (UE)" and other suitable terminal devices capable of communicating with a network device. For example, the "terminal device" may refer to a terminal, a Mobile Terminal (MT), a Subscriber Station (SS), a portable subscriber station, a Mobile Station (MS), or an Access Terminal (AT).
The term "circuitry" as used herein may refer to one or more or all of the following:
(a) a purely hardware circuit implementation (such as an implementation in analog and/or digital circuitry only), and
(b) a combination of hardware circuitry and software, such as (as applicable):
(i) combinations of analog and/or digital hardware circuitry and software/firmware, and
(ii) a hardware processor (including a digital signal processor) with software, any portions of software and memory that work together to cause a device such as a mobile phone or server to perform various functions, and
(c) hardware circuitry and/or a processor, such as a microprocessor or a portion of a microprocessor, that requires software (e.g., firmware) to operate but may not exist when operation is not required.
This definition of "circuitry" applies to all uses of the term in this application, including in any claims. As another example, as used in this application, the term "circuitry" also encompasses only a portion of an implementation of a hardware circuit or processor (or multiple processors) or a hardware circuit or processor and its (or their) accompanying software and/or firmware. The term "circuitry" also encompasses (e.g., and where applicable to the particular claim element (s)) a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in a server, a cellular network device, or other computing or network device.
The term "Sounding Reference Signal (SRS)" as used herein refers to a reference signal transmitted by a terminal device in the uplink direction, which is used by a network device to calculate the channel quality of the uplink path for each sub-segment of the frequency region.
The term "Channel State Information (CSI)" herein refers to known communication link channel properties. This information describes how the signal propagates from the transmitter to the receiver and represents the combined effects of, for example, scattering, fading, and power attenuation over distance.
As described above, in the TDD system, when the network device acquires CSI in downlink using UL SRS, UL-downlink reciprocity is used. Some terminal devices have fewer transmit antenna ports than receive antenna ports due to differences in terminal device capabilities. Therefore, only the antenna with the transmission port can be detected by using the SRS signal in UL, and thus only partial CSI, i.e. partial channel reciprocity, can be obtained on the network device.
Several solutions are proposed to the problem of reciprocity of the partial channels.
Solution 1: no Precoding Matrix Indicator (PMI) feedback. In this scheme, the gbb constructs the DL precoder using only the available SRS measurements. However, due to the partial channel reciprocity, the overall performance of the downlink precoder is affected.
Solution 2: partial CSI feedback is provided for the gNB to obtain full CSI. In this scheme, DL CSI obtained by the gNB is divided into two parts, one part is based on SRS measurement and the other part is based on channel state information feedback from the UE.
Solution 3: CSI feedback for non-precoded/beamformed CSI-RS, including CQI, RI, and PMI. In this scheme, the gbb obtains the long-term/wide-band DL CSI from SRS measurements and forms a beamforming CSI-RS based on the precoder.
Solution 4 SRS antenna switching. In this scheme, the UE transmits the SRS from different antenna groups in different Orthogonal Frequency Division Multiplexing (OFDM) symbols or different subframes.
The recently released release 15 decided to adopt scheme 4, SRS antenna switching. However, there are two main disadvantages: (1) hardware related issues such as insertion loss and switching transients; (2) delays introduced by multiple SRS transmissions. The channel matrix is estimated based on different SRS transmission scenarios, which is an erroneous choice for very fast users due to the effects of channel aging.
The recently released version 15 also enables variants of scheme 2. For example, SRS from the UE may be used to determine the long-term beams, and the UE-specific CSI-RS may then be precoded with the long-term beams to enable subsequent up-to-date RI/CQI/PMI feedback for the channels formed by the long-term beams.
In scheme 2, a scheme with partial CSI feedback information is proposed, where the second part of the CSI information is explicitly signaled to reduce the Channel Frequency Response (CFR) part H2Or by feedback H2The covariance matrix information of (a).
It is clear that sending back a quantized version of the CFR without special compression will consume a large amount of UL overhead. Furthermore, in this solution, part of the information (i.e. H) obtained at the gNB is probed by the SRS1) And missing information H2The correlation between them is not used to reduce the required total overhead, which means that the required UL overhead is the same as for FDD systems without channel reciprocity at all.
Therefore, it is necessary to design a new scheme for acquiring CSI. According to embodiments of the present disclosure, CSI is estimated by SRS sounding on a reference antenna instead of CSI feedback. In this way, overhead is reduced.
Fig. 1 shows a schematic diagram of a communication system 100 in which embodiments of the present disclosure may be implemented. Communication system 100, which is part of a communication network, includes terminal devices 110-1, 110-2, … …, 110-N (collectively, "terminal devices 110", where N is an integer) and network device 120. It should be noted that communication system 100 may also include other elements that are omitted for clarity. Network device 120 may communicate with terminal device 110. It should be understood that the number of terminal devices and network devices shown in fig. 1 is given for illustrative purposes and does not suggest any limitation.
Communications in communication system 100 may be implemented in accordance with any suitable communication protocol, including, but not limited to, first-generation (1G), second-generation (2G), third-generation (3G), fourth-generation (4G), and fifth-generation (5G), etc. cellular communication protocols, wireless local area network communication protocols such as Institute of Electrical and Electronics Engineers (IEEE)802.11, and/or any other protocol currently known or developed in the future. Moreover, the communication may utilize any suitable wireless communication technology, including but not limited to: code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Frequency Division Duplex (FDD), Time Division Duplex (TDD), Multiple Input Multiple Output (MIMO), Orthogonal Frequency Division Multiple Access (OFDMA), and/or any other technique now known or later developed.
Fig. 2 shows a schematic diagram of a terminal device with multiple antennas. As shown in fig. 2, terminal device 110-1 may have antennas 210-1, 210-2. In some embodiments, antenna 210 may be a cross-polarized antenna. For example, if terminal device 110-1 has four cross-polarized antennas, there may be eight antenna ports. It should be noted that the antenna shown in fig. 2 is merely an example and not a limitation. Terminal device 1101-1 may have any other suitable antenna configuration.
Fig. 3 shows a flow diagram of a method 300 according to an embodiment of the present disclosure. Method 300 may be implemented on any suitable network device. For purposes of illustration only, method 300 is described as being implemented at network device 120.
At block 310, network device 120 performs measurements of SRS on at least one reference antenna (e.g., antenna 210-1) selected from the plurality of antennas 210 of terminal device 110-1. If one reference antenna 210-1 is present, network device 120 may perform SRS measurements on antenna 210-1 in both polarizations. Alternatively, there may be multiple reference antennas, e.g., antenna 210-1 and antenna 210-2. Network device 120 may perform SRS measurements on antennas 210-1 and 210-2, respectively, having different polarizations.
In some embodiments, terminal device 110-1 may transmit an index of at least one reference antenna. For example, terminal device 110-1 may detect the antenna with the strongest total coefficient for each polarization and send the index to network device 120.
In other embodiments, network device 120 may determine at least one reference antenna. For example, network device 120 may obtain a configuration of multiple antennas 210. Network device 120 may also obtain historical DL CSI information. Network device 120 may determine at least one reference antenna based on the configuration and the DL CSI information. The configuration may be obtained from terminal device 110-1. Alternatively, the configuration may be stored in a storage device accessible to network device 120. Network device 120 may transmit the determined index of the at least one reference antenna to terminal device 110-1. The index may be transmitted via any suitable DL signaling.
In some embodiments, for each antenna configuration, at least one reference antenna may be fixed. Network device 120 may determine the fixed reference antenna for terminal device 110-1 if network device 120 obtains the antenna configuration for terminal device 110-1. In this way, hardware complexity is reduced since no switching of antennas is required. For purposes of illustration only, the reference antenna as used herein refers to antenna 210-1.
At block 320, network device 120 may determine a channel response between network device 120 and reference antenna 210-1. For example, the channel response may be represented by the following matrix:
Figure BDA0003165017960000091
Figure BDA0003165017960000092
wherein the content of the first and second substances,
Figure BDA0003165017960000093
reference antenna # m0Polarization 0 ofSA xB channel matrix, and
Figure BDA0003165017960000094
reference antenna # m1Polarization 1 ofSA xB channel matrix; n is the number of receive antenna ports, B is the number of transmit antenna ports (beams); and NSIs the channel support length.
At block 330, network device 120 receives phase information associated with multiple antennas from terminal device 110-1. The phase information may be related to all antennas except the reference antenna. Terminal device 110-1 may transmit a signal including phase information
Figure BDA0003165017960000095
UL CSI feedback. For example, the phase information is represented by the following matrix:
Figure BDA0003165017960000096
where n can be any suitable integer from 0 to M-1. If p is equal to 0, n is not equal to m0If p is equal to 1, n is not equal to m1。
At block 340, network device 110-1 generates an estimate of CSI between network device 110-1 and the plurality of antennas 210 based on the phase information and the channel response.
In some embodiments, network device 110-1 may estimate amplitude information for multiple antennas 210 based on the channel response. For example, terminal device 110-1 may perform SRS measurements on two polarizations and obtain channel responses (e.g., matrix 1 and matrix 2) on the two polarizations. Terminal device 120 can determine that the antenna amplitude at polarization 0 is the same as the amplitude of reference antenna 210-1 at polarization 0 and that the antenna amplitude at polarization 1 is the same as the amplitude of reference antenna 210-1 at polarization 1.
The network device may be based on the channel response and the estimated magnitude informationThe CSI is determined. In this case, the total UL overhead is (N)s.B.(N-2))×NphaseIn which N isphaseIs the number of bits used to quantize the phase component. In this way, the overall overhead is reduced.
Alternatively, network device 120 may receive the magnitude information from terminal device 110-1. For example, the terminal device 110-1 may form an amplitude difference matrix by dot division. The amplitude difference matrix can be expressed as follows:
Figure BDA0003165017960000101
terminal device 110-1 may quantize
Figure BDA0003165017960000102
And feeds back the amplitude information to the network device 120. Network device 120 may be based on
Figure BDA0003165017960000103
And amplitude information is obtained with reference to the amplitude information of the antenna 210-1. The total UL overhead is (N)phase+NampD) In which N isphaseIs the number of bits used to quantize the phase component, and NampDIs the number of bits used to quantize the amplitude portion of the difference matrix. In this way, the UL overhead is reduced and accuracy is improved.
In some embodiments, network device 120 may perform DL transmission based on the estimated CSI. Alternatively or additionally, network device 120 may schedule resources for terminal device 110-1 based on the estimated CSI.
In some embodiments, an apparatus (e.g., network device 120) for performing method 300 may include respective means for performing respective steps in method 300. These components may be implemented in any suitable manner. For example, it may be implemented by a circuit or a software module.
In some embodiments, the apparatus comprises: means for performing Sounding Reference Signal (SRS) measurements on at least one reference antenna selected from a plurality of antennas of a terminal device; means for determining a channel response between the network device and at least one reference antenna based on the measurements; means for receiving phase information associated with a plurality of antennas from a terminal device; and means for generating an estimate of Channel State Information (CSI) between the network device and the plurality of antennas based on the phase information and the channel response.
In some embodiments, the at least one reference antenna comprises a first cross-polarized antenna and the means for performing SRS measurements comprises means for performing SRS measurements in two polarizations on the first cross-polarized antenna.
In some embodiments, the at least one reference antenna comprises a first cross-polarized antenna and a second cross-polarized antenna, and the means for performing SRS measurements comprises means for performing SRS measurements on the first cross-polarized antenna in a first polarization; and means for performing a measurement of SRS on the second cross-polarized antenna with the second polarization.
In some embodiments, the means for generating an estimate of CSI comprises: means for generating another estimate of amplitude information associated with the plurality of antennas based on the channel response; and means for generating an estimate of the CSI based on the phase information and another estimate of the estimated magnitude information.
In some embodiments, the means for generating an estimate of CSI comprises: means for receiving differential amplitude information associated with a plurality of antennas from a terminal device; and means for generating an estimate of the CSI based on the differential amplitude information and the phase information.
In some embodiments, the apparatus further comprises: means for receiving an index of at least one reference antenna from a terminal device.
In some embodiments, the apparatus further comprises: means for obtaining a configuration of a plurality of antennas of a terminal device; and means for determining at least one antenna based on the configuration.
Fig. 4 shows a flow diagram of a method 400 according to an embodiment of the present disclosure. Method 400 may be implemented on any suitable network device. Method 400 is described as being implemented at terminal device 110-1 for purposes of illustration only.
In some embodiments, terminal device 110-1 may transmit an index of at least one reference antenna. For example, terminal device 110-1 may detect the antennas with coefficients for each antenna and select the reference antenna with the strongest overall coefficient in each polarization. Terminal device 110-1 may send the index to network device 120.
At block 410, terminal device 110-1 transmits an SRS to network device 120 using multiple antennas 210. For example, the terminal device transmits the SRS at most once every two subframes, and at least once every 32 frames (320 subframes). The SRS is transmitted at the last symbol of the UL slot having the full system bandwidth region and is transmitted at a certain interval.
Terminal device 110-1 may transmit the SRS according to a configuration (e.g., Radio Resource Control (RRC) connection setup, RRC connection reconfiguration) set by the signaling message.
At block 420, the terminal device sends phase information associated with the plurality of antennas 210 to the network device 120. Terminal device 110-1 may transmit a signal including phase information
Figure BDA0003165017960000121
UL CSI feedback. The phase information may be related to all antennas except the reference antenna.
At block 430, terminal device 110-1 receives a downlink transmission based on Channel State Information (CSI) between the network device and the plurality of antennas. In some embodiments, terminal device 110-1 may receive a DL CSI Channel Frequency Response (CFR)
Figure BDA0003165017960000122
Where N is the number of receive antenna ports, B is the number of transmit antenna ports (beams), and NαIs the number of active sub-carriers. Through a compressed sensing scheme (CS), terminal device 110-1 may find
Figure BDA0003165017960000123
Channel support (position of significant tap) vector of time domain channel replica (counter)
Figure BDA0003165017960000124
Wherein N isSIs the channel support length.
In some embodiments, an apparatus (e.g., terminal device 110-1) for performing method 400 may include corresponding means for performing corresponding steps in method 400. These components may be implemented in any suitable manner. For example, it may be implemented by a circuit or a software module.
In some embodiments, the apparatus comprises: means for transmitting, by a network device, a Sounding Reference Signal (SRS) to a network device utilizing a plurality of antennas of a terminal device to obtain, by the network device, a channel response between at least one reference antenna and the network device; means for transmitting phase information associated with a plurality of antennas to a network device; and means for receiving a downlink transmission from the network device, the downlink transmission based on Channel State Information (CSI) between the network device and the plurality of antennas, the CSI estimated based on the channel response and the phase information.
In some embodiments, the apparatus further comprises: means for transmitting amplitude information associated with the plurality of antennas to a network device.
In some embodiments, the apparatus further comprises: means for selecting at least one reference antenna from a plurality of antennas based on amplitude information associated with the plurality of antennas; and means for transmitting the index of the at least one reference antenna to the network device.
Fig. 5 is a simplified block diagram of a device 500 suitable for implementing embodiments of the present disclosure. Device 500 may be implemented at network device 120. Device 500 may also be implemented at terminal device 110-1. As shown, the device 500 includes one or more processors 510, one or more memories 520 coupled to the processor(s) 510, one or more transmitters and/or receivers (TX/RX)540 coupled to the processor 510.
The processor 510 may be of any type suitable to the local technology network, and may include one or more of general purpose computers, special purpose computers, microprocessors, Digital Signal Processors (DSPs) and processors based on a multi-core processor architecture, as non-limiting examples. The device 500 may have multiple processors, such as application specific integrated circuit chips, that are time dependent from a clock synchronized with the main processor.
The memory 520 may be of any type suitable for a local technology network, and may be implemented using any suitable data storage technology, such as non-transitory computer-readable storage media, semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory, and removable memory, as non-limiting examples.
The memory 520 stores at least a portion of the program 530. TX/RX 540 is used for bi-directional communication. TX/RX 540 has at least one antenna to facilitate communication, although in practice the access node referred to in this application may have multiple antennas. A communication interface may represent any interface necessary to communicate with other network elements.
The program 530 is assumed to include program instructions that, when executed by the associated processor 510, enable the device 500 to operate in accordance with embodiments of the present disclosure, as discussed herein with reference to fig. 3 and 4. That is, embodiments of the present disclosure may be implemented by computer software executable by the processor 510 of the device 500, or by hardware, or by a combination of software and hardware.
While this specification contains many specific implementation details, these should not be construed as limitations on the scope of any disclosure or of what may be claimed, but rather as descriptions of features specific to particular disclosures of particular implementations. Certain features that are described in this specification in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination. Furthermore, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination.
Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. And (6) obtaining the result. In some cases, multitasking and parallel processing may be advantageous. Moreover, the separation of various system components in the embodiments described above should not be understood as requiring such separation in all embodiments, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products.
Various modifications, adaptations, and other embodiments of the present disclosure may become apparent to those skilled in the relevant arts in view of the foregoing description, when read in conjunction with the accompanying drawings. Any and all modifications will still fall within the scope of the non-limiting and exemplary embodiments of this disclosure. Moreover, other embodiments of the present disclosure set forth herein will occur to those skilled in the art to which these embodiments of the present disclosure pertain having the benefit of the teachings presented in the foregoing descriptions and the associated drawings.
Therefore, it is to be understood that the embodiments of the disclosure are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (24)

1. A network device, comprising:
at least one processor; and
a memory coupled to the at least one processor having instructions stored therein that, when executed by the at least one processor, cause the network device to:
performing Sounding Reference Signal (SRS) measurements on at least one reference antenna selected from a plurality of antennas of a terminal device;
determining a channel response between the network device and the at least one reference antenna based on the measurements;
receiving phase information associated with the plurality of antennas from the terminal device; and
generating an estimate of Channel State Information (CSI) between the network device and the plurality of antennas based on the phase information and the channel response.
2. The network device of claim 1, wherein the at least one reference antenna comprises a first cross-polarized antenna, wherein the network device is caused to perform the measurement of SRS by:
performing the measurements of SRS in two polarizations on the first cross-polarized antenna.
3. The network device of claim 1, wherein the at least one reference antenna comprises a first cross-polarized antenna and a second cross-polarized antenna, wherein the network device is caused to perform the measurement of SRS by:
performing the measurement of SRS on the first cross-polarized antenna at a first polarization; and
performing the measurement of SRS on the second cross-polarized antenna in a second polarization.
4. The network device of claim 1, wherein the network device is caused to generate the estimate of the CSI by:
generating another estimate of amplitude information associated with the plurality of antennas based on the channel response; and
generating the estimate of the CSI based on the other estimate of estimated magnitude information and the phase information.
5. The network device of claim 1, wherein the network device is caused to generate the estimate of the CSI by:
receiving differential amplitude information associated with the plurality of antennas from the terminal device; and
generating the estimate of the CSI based on the differential magnitude information and the phase information.
6. A network device of claim 1, wherein the network device is further caused to:
receiving an index of the at least one reference antenna from the terminal device.
7. A network device of claim 1, wherein the network device is further caused to:
obtaining a configuration of the plurality of antennas of the terminal device; and
determining the at least one antenna based on the configuration.
8. A terminal device, comprising:
at least one processor; and
a memory coupled to the at least one processor, the memory having instructions stored therein that, when executed by the at least one processor, cause the terminal device to:
transmitting, by a network device, a Sounding Reference Signal (SRS) to a network device with a plurality of antennas of the terminal device to obtain, by the network device, a channel response between at least one reference antenna and the network device;
transmitting phase information associated with the plurality of antennas to the network device; and
receiving a downlink transmission from the network device, the downlink transmission based on Channel State Information (CSI) between the network device and the plurality of antennas, the CSI estimated based on the channel response and the phase information.
9. A terminal device of claim 8, wherein the terminal device is further caused to:
transmitting amplitude information associated with the plurality of antennas to the network device.
10. A terminal device of claim 8, wherein the terminal device is further caused to:
selecting the at least one reference antenna from the plurality of antennas based on amplitude information associated with the plurality of antennas; and
transmitting an index of the at least one reference antenna to the network device.
11. A method of communication, comprising:
performing, at a network device, measurements of a Sounding Reference Signal (SRS) on at least one reference antenna selected from a plurality of antennas of a terminal device;
determining a channel response between the network device and the at least one reference antenna based on the measurements;
receiving phase information associated with the plurality of antennas from the terminal device; and
generating an estimate of Channel State Information (CSI) between the network device and the plurality of antennas based on the phase information and the channel response.
12. The method of claim 11, wherein the at least one reference antenna comprises a first cross-polarized antenna, and wherein performing the measurement of SRS comprises:
performing the measurements of SRS in two polarizations on the first cross-polarized antenna.
13. The method of claim 11, wherein the at least one reference antenna comprises a first cross-polarized antenna and a second cross-polarized antenna, and wherein performing the measurement of SRS comprises:
performing the measurement of SRS on the first cross-polarized antenna at a first polarization; and
performing the measurement of SRS on the second cross-polarized antenna in a second polarization.
14. The method of claim 11, wherein generating the estimate of the CSI comprises:
generating another estimate of amplitude information associated with the plurality of antennas based on the channel response; and
generating the estimate of the CSI based on the other estimate of estimated magnitude information and the phase information.
15. The method of claim 11, wherein generating the estimate of the CSI comprises:
receiving differential amplitude information associated with the plurality of antennas from the terminal device; and
generating the estimate of the CSI based on the differential magnitude information and the phase information.
16. The method of claim 11, further comprising:
receiving an index of the at least one reference antenna from the terminal device.
17. The method of claim 11, further comprising:
obtaining a configuration of the plurality of antennas of the terminal device; and
determining the at least one antenna based on the configuration.
18. A method of communication, comprising:
at the location of the terminal device(s),
transmitting, by a network device, a Sounding Reference Signal (SRS) to a network device with a plurality of antennas of the terminal device to obtain, by the network device, a channel response between at least one reference antenna and the network device;
transmitting phase information associated with the plurality of antennas to the network device; and
receiving a downlink transmission from the network device, the downlink transmission based on Channel State Information (CSI) between the network device and the plurality of antennas, the CSI estimated based on the channel response and the phase information.
19. The method of claim 18, further comprising:
transmitting amplitude information associated with the plurality of antennas to the network device.
20. The method of claim 18, further comprising:
selecting the at least one reference antenna from the plurality of antennas based on amplitude information associated with the plurality of antennas; and
transmitting an index of the at least one reference antenna to the network device.
21. A computer-readable medium having stored thereon instructions that, when executed by at least one processing unit of a machine, cause the machine to perform the method of any one of claims 11-17.
22. A computer-readable medium having stored thereon instructions that, when executed by at least one processing unit of a machine, cause the machine to perform the method of any one of claims 18-20.
23. An apparatus, comprising:
means for performing Sounding Reference Signal (SRS) measurements on at least one reference antenna selected from a plurality of antennas of a terminal device;
means for determining a channel response between the network device and the at least one reference antenna based on the measurements;
means for receiving phase information associated with the plurality of antennas from the terminal device; and
means for generating an estimate of Channel State Information (CSI) between the network device and the plurality of antennas based on the phase information and the channel response.
24. An apparatus, comprising:
means for transmitting, with a plurality of antennas of the terminal device, a Sounding Reference Signal (SRS) to a network device to obtain, by the network device, a channel response between at least one reference antenna and the network device;
means for transmitting phase information associated with the plurality of antennas to the network device; and
means for receiving a downlink transmission from the network device, the downlink transmission based on Channel State Information (CSI) between the network device and the plurality of antennas, the CSI estimated based on the channel response and the phase information.
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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021109150A1 (en) * 2019-12-06 2021-06-10 华为技术有限公司 Method and apparatus for determining channel information
US20230421326A1 (en) * 2021-01-15 2023-12-28 Qualcomm Incorporated Ue-assisted channel reconstruction based on partial spatial sounding
WO2023000264A1 (en) * 2021-07-22 2023-01-26 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for transmission

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102237969A (en) * 2011-08-16 2011-11-09 电信科学技术研究院 Channel state information transmission method and device
CN103181097A (en) * 2010-09-29 2013-06-26 Lg电子株式会社 Method and apparatus for efficient feedback in wireless communication system that supports multiple antennas
CN106664192A (en) * 2015-01-30 2017-05-10 韩国电子通信研究院 Method and apparatus for transmitting downlink reference signal, and method and apparatus for transmitting control information in multi-cell collaborative communication system
CN107888246A (en) * 2016-09-29 2018-04-06 华为技术有限公司 Channel state information feedback method and equipment based on code book

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9160425B2 (en) * 2011-07-01 2015-10-13 Telefonaktiebolaget L M Ericsson (Publ) Beamforming with phase compensation
WO2015188386A1 (en) * 2014-06-13 2015-12-17 Nokia Solutions And Networks Oy Method,apparatus and computer program
US10505597B2 (en) * 2016-05-09 2019-12-10 Qualcomm Incorporated Reference signals and link adaptation for massive MIMO
EP3471317B1 (en) * 2017-01-09 2022-03-02 LG Electronics Inc. Method for transmitting reference signal and device therefor in wireless communication system
US10397888B2 (en) * 2017-04-18 2019-08-27 Qualcomm Incorporated Precoded CSI-RS for phase synchronization for reciprocity-based CoMP joint transmission

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103181097A (en) * 2010-09-29 2013-06-26 Lg电子株式会社 Method and apparatus for efficient feedback in wireless communication system that supports multiple antennas
CN102237969A (en) * 2011-08-16 2011-11-09 电信科学技术研究院 Channel state information transmission method and device
CN106664192A (en) * 2015-01-30 2017-05-10 韩国电子通信研究院 Method and apparatus for transmitting downlink reference signal, and method and apparatus for transmitting control information in multi-cell collaborative communication system
CN107888246A (en) * 2016-09-29 2018-04-06 华为技术有限公司 Channel state information feedback method and equipment based on code book

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