CN112751590B - Method and device for feeding back channel information - Google Patents

Method and device for feeding back channel information Download PDF

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Publication number
CN112751590B
CN112751590B CN201911056750.XA CN201911056750A CN112751590B CN 112751590 B CN112751590 B CN 112751590B CN 201911056750 A CN201911056750 A CN 201911056750A CN 112751590 B CN112751590 B CN 112751590B
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csi report
indication field
indication
network device
channel state
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CN112751590A (en
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王菡凝
李岩
金婧
王飞
王启星
刘光毅
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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Priority to PCT/CN2020/125094 priority patent/WO2021083303A1/en
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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
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]

Abstract

The embodiment of the invention provides a method and equipment for feeding back channel information, wherein the method comprises the following steps: measuring a channel state; determining an RI indication domain according to the channel state, wherein the RI indication domain is used for indicating whether the network equipment needs to perform data transmission and the number of data streams during network transmission; and reporting a CSI report to the network equipment, wherein the CSI report carries the RI indication domain. In the embodiment of the invention, the terminal can inform the base station whether data transmission is needed or not, thereby realizing Single-TRP/Multiple TRP self-adaptive transmission and enabling incoherent combined transmission to be more flexible.

Description

Method and device for feeding back channel information
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a method and equipment for feeding back channel information.
Background
The multipoint transmission technology is to transmit by multiple nodes in a mobile network. The multipoint transmission technology utilizes the cooperation of multiple cells, so that the spectrum efficiency and the system throughput of edge users can be improved.
In low frequency, the technology can better overcome the interference among cells and improve the transmission efficiency of edge users. At high frequencies, the techniques aim to improve the rate experience of edge users, enhance edge coverage, and provide edge users with an experience that is consistent with that of the central user.
The downlink multipoint transmission technology comprises the following specific schemes:
1) Dynamic transmission Point Selection (Dynamic Point Selection):
the terminal only accepts Physical Downlink Shared Channel (PDSCH) data information transmitted by one base station at a time, but the base station may switch among multiple cooperative base stations according to the Channel condition, and only one base station transmits data for the user at a time.
2) Coherent Joint Transmission (Coherent Joint Transmission):
the user receives the same PDSCH data Information transmitted from multiple base stations, but only one of the base stations (the main base station) sends Downlink Control Information (DCI) to the user, and the user feeds back the channel Information to the main base station for scheduling decision, and each Information stream may have multiple base stations jointly transmitting.
3) Non-Coherent Joint Transmission (Non Coherent Joint Transmission):
the user receives different PDSCH data information transmitted from multiple base stations, and the method can be further divided into:
a) Only one of the base stations (the primary base station) transmits DCI for a user, but different information streams are transmitted by different base stations. Fig. 1 illustrates transmission of two base stations as an example, a base station 1 provides initial access and DCI transmission for a user, the user feeds back channel information (including Rank Indication (RI) and the like) to the base station 1 for scheduling decision, and the base station 1 and the base station 2 each use one codeword to transmit single-stream or multi-stream data during data transmission.
b) Each transmission base station sends independent DCI for users respectively and independently transmits different data streams. Fig. 2 illustrates transmission of two base stations as an example, where the base station 1 and the base station 2 establish initial connection with a user, and the user feeds back channel information (including stream number (RI) and the like) to the base station 1 and the base station 2, performs scheduling and data transmission independently, and uses one codeword to transmit single-stream or multi-stream data.
Disclosure of Invention
An object of the embodiments of the present invention is to provide a method and an apparatus for channel information feedback, which solve the problem of adaptive transmission of a single transmission node/multiple transmission nodes.
In a first aspect, an embodiment of the present invention provides a method for feeding back channel information, which is applied to a terminal, and includes:
measuring a channel state;
determining a Rank Indication (RI) indicating domain according to the channel state, wherein the RI indicating domain is used for indicating whether the network equipment needs to perform data transmission and the number of data streams during network transmission;
and reporting a Channel State Information (CSI) report to the network equipment, wherein the CSI report carries the RI indication domain.
Optionally, when the channel status is smaller than a preset threshold, the RI indication field indicates that the network device does not need to perform data transmission.
Optionally, when the RI indication field indicates that the network device does not need to perform data transmission, the CSI report further includes: a channel state information reference signal resource indication, CRI; alternatively, one or more of the following are not included in the CSI report: a precoding matrix indicator PMI, a channel quality indicator CQI and a layer indicator LI.
Optionally, the method further comprises: and determining the BitWidth corresponding to the RI indication domain in the CSI report according to the codebook type used by the terminal.
Optionally, determining, according to a codebook type used by the terminal, a Bitwidth corresponding to the RI indicator field in the CSI report, where the Bitwidth includes any one or more of the following items:
if the codebook type is typeI-singlePanel and corresponds to 1 antenna port, the Bitwidth corresponding to the RI indication domain is 1;
if the codebook type is typeI-singlePanel and corresponds to 2 antenna ports, corresponding to the RI fingerBitwidth of an indication domain is
Figure BDA0002256743490000031
If the codebook type is typeI-SinglePanel and corresponds to 4 antenna ports, the Bitwidth corresponding to the RI indication field is
Figure BDA0002256743490000032
If the codebook type is typeI-singlePanel, is greater than 4 antenna ports, and the range of Rank is 1 to 4, the BitWidth corresponding to the RI indication field is
Figure BDA0002256743490000033
If the codebook type is typeI-singlePanel, is larger than 4 antenna ports, and the range of Rank is 5 to 8, the Bitwidth corresponding to the RI indication field is
Figure BDA0002256743490000034
If the codebook type is typeI-MultiPanel, the Bitwidth corresponding to the RI indication field is
Figure BDA0002256743490000035
If the codebook type is typeII-PortSelection, the BitWidth corresponding to the RI indication field is
Figure BDA0002256743490000036
Wherein n is RI Indicates the number of RI values that can be used.
In a second aspect, an embodiment of the present invention further provides a method for feeding back channel information, which is applied to a network device, and includes:
and receiving a CSI report from a terminal, wherein the CSI report carries an RI indication domain which indicates whether the network equipment needs to carry out data transmission and the number of data streams during network transmission.
Optionally, if the RI indicates that the domain indicates that the network device does not need to perform data transmission, the method further includes: and not scheduling resources for the terminal.
Optionally, after not scheduling resources to the terminal, the method further comprises:
and if the network equipment receives an RI indication domain informing that the network equipment needs to carry out data transmission, continuing to schedule resources for the terminal.
Optionally, when the channel status is smaller than a preset threshold, the RI indication field indicates that the network device does not need to perform data transmission.
Optionally, when the RI indication field indicates that the network device does not need to perform data transmission, the CSI report further includes: CRI; alternatively, one or more of the following are not included in the CSI report: PMI, CQI and LI.
In a third aspect, an embodiment of the present invention further provides a terminal, including:
a measuring module for measuring a channel state;
a first determining module, configured to determine, according to the channel state, an RI indication field, where the RI indication field is used to indicate whether a network device needs to perform data transmission and a data flow number during network transmission;
and the reporting module is used for reporting a CSI report to the network equipment, wherein the CSI report carries the RI indication domain.
In a fourth aspect, an embodiment of the present invention further provides a terminal, including: a first transceiver and a first processor;
the first processor is configured to measure a channel state;
the first processor is further configured to determine, according to the channel state, an RI indication field, where the RI indication field is used to indicate whether a network device needs to perform data transmission and a data flow number during network transmission;
the first transceiver is configured to report a CSI report to the network device, where the CSI report carries the RI indication field.
In a fifth aspect, an embodiment of the present invention further provides a network device, including:
and the receiving module is used for receiving a CSI report from a terminal, wherein the CSI report carries an RI indication domain which indicates whether the network equipment needs to perform data transmission and the number of data streams during network transmission.
In a sixth aspect, an embodiment of the present invention further provides a network device, including: a second transceiver and a second processor;
the second transceiver is configured to receive a CSI report from a terminal, where the CSI report carries an RI indication field, and the RI indication field indicates whether a network device needs to perform data transmission and a data flow number during network transmission.
In a seventh aspect, an embodiment of the present invention further provides a terminal, including: a processor, a memory and a program stored on the memory and executable on the processor, which program, when executed by the processor, performs the steps of the method of channel information feedback as described in the first aspect.
In an eighth aspect, an embodiment of the present invention further provides a network device, including: a processor, a memory and a program stored on the memory and executable on the processor, the program, when executed by the processor, implementing the steps of the method of channel information feedback.
In a ninth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the method for channel information feedback according to the first aspect or the second aspect.
In the embodiment of the invention, the terminal can inform the base station whether data transmission is needed or not, so that single transmission node/multi-transmission node self-adaptive transmission is realized, and incoherent combined transmission is more flexible.
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Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is one illustration of non-coherent joint transmission;
FIG. 2 is a second schematic diagram of non-coherent joint transmission;
FIG. 3 is a block diagram of a wireless communication system according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for channel information feedback at a terminal side according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for feeding back channel information of a network side according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 7 is a second schematic structural diagram of a terminal according to an embodiment of the present invention;
FIG. 8 is a diagram illustrating a structure of a network device according to an embodiment of the present invention;
FIG. 9 is a second schematic structural diagram of a network device according to an embodiment of the present invention;
fig. 10 is a third schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 11 is a third schematic structural diagram of a network device in an embodiment of the present invention.
Detailed Description
Taking periodic Channel State Information (CSI) feedback as an example, two base stations configure a CSI reporting configuration (CSI-reporting configuration) for a terminal respectively, and are associated with 2-3 non-zero power CSI-RS Resource settings (NZP CSI-RS Resource Setting) respectively. The terminal needs to perform channel estimation on the transmission node 1 (TRP 1) and the transmission node 2 (TRP 2) based on NZP CSI-RS Resource Setting configured for each transmission node (TRP), and feeds back CSI (channel state information reference signal Resource indicator (CRI)/RI/Precoding Matrix Indicator (PMI)/Channel Quality Indicator (CQI)) to the TRP1 and the TRP2, respectively, after calculation. In a current New Radio (NR) protocol, when a user feeds back a number of streams (RI) of channel information, a minimum of 1 stream is to be fed back by default.
For non-coherent transmission of non-ideal backhaul (non-ideal backhaul), the current protocol cannot support adaptive transmission of Single-transmission node (Single-TRP)/Multiple-transmission node (Multiple-TRP). When the user feeds back channel information to two base stations respectively, each base station schedules resources for the user every time if the minimum feedback 1 stream is defaulted every time. However, when the channel condition changes, if the user only receives the multi-stream data of one of the base stations better than the data received from the two base stations, the current protocol cannot inform the other base station through the feedback information that the data is not transmitted. Moreover, for non-ideal backhaul networks, the base stations cannot interact with each other in real time to notify another base station that data transmission is not needed. Therefore, the current protocol cannot well support the self-adaptive transmission of Single-TRP/Multiple TRP in non-ideal backhaul network.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "comprises," "comprising," or any other variation thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, the use of "and/or" in the specification and claims means that at least one of the connected objects, such as a and/or B, means that three cases, a alone, B alone, and both a and B, exist.
In the present embodiments, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present relevant concepts in a concrete fashion.
The techniques described herein are not limited to Long-term Evolution (LTE)/LTE-Advanced (LTE-a) systems, and may also be used for various wireless communication systems, such as Code Division Multiple Access (CDMA), time Division Multiple Access (TDMA), frequency Division Multiple Access (FDMA), orthogonal Frequency Division Multiple Access (OFDMA), single-carrier Frequency-Division Multiple Access (SC-FDMA), and other systems.
The terms "system" and "network" are often used interchangeably. CDMA systems may implement Radio technologies such as CDMA2000, universal Terrestrial Radio Access (UTRA), and so on. UTRA includes Wideband CDMA (Wideband Code Division Multiple Access, WCDMA) and other CDMA variants. TDMA systems may implement radio technologies such as Global System for Mobile communications (GSM). The OFDMA system may implement radio technologies such as Ultra Mobile Broadband (UMB), evolved-UTRA (E-UTRA), IEEE 802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE 802.20, flash-OFDM, etc. UTRA and E-UTRA are parts of the Universal Mobile Telecommunications System (UMTS). LTE and higher LTE (e.g., LTE-A) are new UMTS releases that use E-UTRA. UTRA, E-UTRA, UMTS, LTE-A, and GSM are described in documents from an organization named "third Generation Partnership project" (3 rd Generation Partnership project,3 GPP). CDMA2000 and UMB are described in documents from an organization named "third generation partnership project 2" (3 GPP 2). The techniques described herein may be used for both the above-mentioned systems and radio technologies, as well as for other systems and radio technologies.
The method and the device for feeding back the channel information provided by the embodiment of the invention can be applied to a wireless communication system. Fig. 3 is a block diagram of a wireless communication system according to an embodiment of the present invention. As shown in fig. 3, the wireless communication system may include: a network device 31 and a terminal 32, the terminal 32 may be denoted as UE32, and the terminal 32 may communicate (transmit signaling or transmit data) with the network device 31. In practical applications, the connections between the above devices may be wireless connections, and fig. 3 illustrates solid lines for convenience and intuition of the connection relationships between the devices.
The network device 31 provided in the embodiment of the present invention may be a base station, which may be a commonly used base station, an evolved node base (eNB), or a network device in a 5G system (e.g., a next generation base station (gNB) or a Transmission and Reception Point (TRP)).
The terminal 32 provided in the embodiment of the present invention may be a Mobile phone, a tablet Computer, a notebook Computer, an Ultra-Mobile Personal Computer (UMPC), a netbook or a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), or a vehicle-mounted Device.
Referring to fig. 4, an embodiment of the present invention provides a method for feeding back channel information, where an execution subject of the method is a terminal, and the method includes: steps 401, 402 and 403.
Step 401: measuring a channel state;
step 402: determining an RI indication domain according to the channel state, wherein the RI indication domain represents whether the network equipment needs to perform data transmission and the number of data streams during network transmission;
step 403: and reporting a CSI report to the network equipment, wherein the CSI report carries an RI indication domain.
For example, an RI indication field carried in the CSI report indicates that the network device does not need to perform data transmission, the base station does not schedule resources for the terminal to perform data transmission any more, and the terminal enters a Single-TRP operating mode; if the channel state is recovered, the RI indication field carried in the CSI report fed back by the terminal indicates that the network equipment needs to perform data transmission, the base station can still continue to schedule resources for the terminal, and the terminal enters a Multiple TRP working mode.
In some embodiment modes, when the channel state is smaller than the preset threshold, the RI indication field indicates that the network device does not need to perform data transmission.
For example, the channel status is poor, the terminal does not want the base station to continue scheduling resources, and it may be determined that the RI indication field =0 or 00, and the RI indication field =0 or 00 indicates that the network device does not need to perform data transmission. It is understood that the value of the RI indication field is not limited.
In some embodiment modes, when the RI indication field indicates that the network device does not need to perform data transmission, the CSI report further includes: CRI; alternatively, one or more of the following are not included in the CSI report: PMI, CQI, and Layer Indication (LI).
In some embodiment modes, the method further comprises: and determining the bit width (Bitwidth) corresponding to the RI indication domain in the CSI report according to the type of the codebook used by the terminal.
The specific mode can be realized by any one or more of the following steps:
(1) If the codebook type is a single-board type one (typeI-singlePanel) and corresponds to 1 antenna port (antenna port), the BitWidth corresponding to the RI indication field is 1;
(2) If the codebook type is typeI-singlePanel and corresponds to 2 antenna ports, the BitWidth corresponding to the RI indication field is
Figure BDA0002256743490000091
(3) If the codebook type is typeI-singlePanel and corresponds to 4 antenna ports, the BitWidth corresponding to the RI indication field is
Figure BDA0002256743490000092
(4) If the codebook type is typeI-singlePanel, is greater than 4 antenna ports, and the range of the Rank (Rank) is 1 to 4, the BitWidth corresponding to the RI indication field is
Figure BDA0002256743490000093
(5) If the codebook type is typeI-singlePanel, is greater than 4 antenna ports, and the range of Rank is 5 to 8, the BitWidth corresponding to the RI indication field is
Figure BDA0002256743490000094
(6) If the codebook type is a multi-plate type one (typeI-MultiPanel), the BitWidth corresponding to the RI indication field is
Figure BDA0002256743490000095
(7) If the codebook type is port selection type II-PortSelect, the BitWidth corresponding to the RI indication field is
Figure BDA0002256743490000096
Wherein n is RI Indicates the number of RI values that can be used.
In the embodiment of the invention, the terminal can inform the base station whether data transmission is needed or not, thereby realizing Single-TRP/Multiple TRP self-adaptive transmission and enabling incoherent combined transmission to be more flexible.
Referring to fig. 5, an embodiment of the present invention further provides a method for feeding back channel information, where an execution subject of the method is a network device, and the method includes: step 501.
Step 501: and receiving a CSI report from a terminal, wherein the CSI report carries an RI indication domain which indicates whether the network equipment needs to perform data transmission and the number of data streams during network transmission.
For example, RI indicates field =0 or 00 indicates that the network device does not need to perform data transmission. It is understood that the value of the RI indication field is not limited.
In some embodiment modes, if the first indication field indicates that the network device does not need to perform data transmission, the method shown in fig. 5 further includes: no resources are scheduled for the terminal.
In some embodiment, after not scheduling resources for the terminal, the method shown in fig. 5 further includes:
and if the network equipment receives an RI indication domain informing that the network equipment needs to carry out data transmission, continuing to schedule resources for the terminal.
In some embodiment, when the channel status is smaller than a preset threshold, the RI indication field indicates that the network device does not need to perform data transmission.
In some embodiment, when the RI indication field indicates that the network device does not need to perform data transmission, the CSI report further includes: CRI; alternatively, one or more of the following are not included in the CSI report: PMI, CQI and LI.
The base station configures CSI-report config for the terminal, and configures a reporting quantity field for indicating a CSI reporting format, wherein the format "cri-RI-PMI-CQI", "cri-RI-i1-CQI", "cri-RI-CQI" or "cri-RI-LI-PMI-CQI" requires a user feedback stream number (RI), and the terminal measures a channel state according to a related Resource (CSI-RS associated in Resource Setting). If the terminal measurement result is poor, the base station is considered not to continue transmission, and the RI indication domain =0 is fed back in the CSI report.
When the user feedback RI indicates domain =0, the CRI information may be fed back.
When the RI indication field =0 is fed back by the user, channel information such as PMI, CQI, LI, and the like may not be fed back.
And the base station receives the CSI report of the user, if the RI indication field feedback is 0, the base station does not schedule the resource for the user for data transmission any more, and the terminal enters a Single-TRP working mode.
The base station does not schedule resources for the user any more but can also configure CSI feedback for the user, when the channel condition is recovered, the user feeds back a nonzero RI indication domain, the base station can still continue to schedule the user resources, and the terminal enters a Multi-TRP working mode.
When a user feeds back rank number (RI) of CSI, according to different codebook types used by the user, bit widths of RI indication fields are defined differently, as shown in the following tables 1 to 3:
when the codebook type of the user is typeI-SinglePanel (codebookType = typeI-SinglePanel), the RI indicates the bit width of the field as shown in table 1:
table 1.
Figure BDA0002256743490000111
When the codebook type is typeI-MultiPanel (codebook type = typeI-MultiPanel), the RI indicates the bit width of the field as shown in table 2:
table 2: RI indicates the bit width of the field.
Figure BDA0002256743490000112
When the codebook type is typeII-PortSelection (codebookType = typeII-PortSelection), the bit width of the RI indication field is as shown in Table 3:
table 3: RI indicates the bit width of the field.
Figure BDA0002256743490000113
n RI The values in the Rank Indicator field correspond to the flow values fed back by the terminal in ascending order, and a value "0" indicates that the terminal has poor channel measurement conditions and does not want the base station to continue scheduling resources.
Taking the codebook type as typeI-SinglePanel as an example, when the terminal feeds back the RI indication field in CSI-Report, "00" indicates that the base station is not required to transmit, "01" indicates that 1 stream is transmitted, and "10" indicates that 2 streams are transmitted. Alternatively, "11" may indicate no transmission is required, "00" may still indicate transmission of a 1 stream, and "01" may still indicate transmission of a2 stream.
In the embodiment of the invention, the terminal can inform the base station whether data transmission is needed or not, thereby realizing Single-TRP/Multiple TRP self-adaptive transmission and enabling incoherent combined transmission to be more flexible.
Referring to fig. 6, an embodiment of the present invention further provides a terminal, where the terminal 600 includes:
a measuring module 601, configured to measure a channel state;
a first determining module 602, configured to determine, according to the channel state, an RI indication field, where the RI indication field is used to indicate whether a network device needs to perform data transmission and a data flow number when performing network transmission;
a reporting module 603, configured to report a CSI report to the network device, where the CSI report carries the RI indication field.
In some embodiment, when the channel status is smaller than a preset threshold, the RI indication field indicates that the network device does not need to perform data transmission.
In some embodiment modes, when the RI indication field indicates that the network device does not need to perform data transmission, the CSI report further includes: CRI; alternatively, one or more of the following are not included in the CSI report: PMI, CQI and layer indication LI.
In some embodiment, the terminal 600 further includes:
and a second determining module, configured to determine, according to a codebook type used by the terminal, a Bitwidth corresponding to the RI indicator field in the CSI report.
In some embodiment modes, determining Bitwidth corresponding to the RI indication field in the CSI report according to a codebook type used by the terminal includes any one or more of the following:
if the codebook type is a single-board type, namely typeI-singlePanel, and corresponds to 1 antenna port, the BitWidth corresponding to the RI indication field is 1;
if the codebook type is typeI-singlePanel and corresponds to 2 antenna ports, the BitWidth corresponding to the RI indication field is
Figure BDA0002256743490000121
If the codebook type is typeI-singlePanel and corresponds to 4 antenna ports, the BitWidth corresponding to the RI indication field is
Figure BDA0002256743490000122
If the codebook type is typeI-singlePanel, is greater than 4 antenna ports, and the range of Rank is 1 to 4, the BitWidth corresponding to the RI indication field is
Figure BDA0002256743490000123
If the codebook type is typeI-singlePanel, is greater than 4 antenna ports, and the range of Rank is 5 to 8, the BitWidth corresponding to the RI indication field is
Figure BDA0002256743490000124
If the codebook type is multi-plate type typeI-MultiPanel, the BitWidth corresponding to the RI indication field is
Figure BDA0002256743490000131
If the codebook type is port selection type II-PortSelection, bitWidth corresponding to the RI indication field is
Figure BDA0002256743490000132
Wherein n is RI Indicates the number of RI values that can be used.
The terminal provided in the embodiment of the present invention may execute the above-described embodiment shown in fig. 4, and the implementation principle and technical effects are similar, which are not described herein again.
Referring to fig. 7, an embodiment of the present invention further provides a terminal, where the terminal 700 includes: a first transceiver 701 and a first processor 702.
A first processor 702 for measuring a channel state;
a first processor 702, further configured to determine, according to the channel state, an RI indication field, where the RI indication field is used to indicate whether a network device needs to perform data transmission and a data flow number when performing network transmission;
a first transceiver 701, configured to report a CSI report to the network device, where the CSI report carries the RI indication field.
In some embodiment modes, when the channel state is smaller than a preset threshold, the RI indication field indicates that the network device does not need to perform data transmission.
In some embodiment modes, when the RI indication field indicates that the network device does not need to perform data transmission, the CSI report further includes: CRI; alternatively, one or more of the following are not included in the CSI report: PMI, CQI and layer indication LI.
In some embodiment modes, the first processor 702 is further configured to determine, according to a type of a codebook used by the terminal, a Bitwidth corresponding to the RI indication field in the CSI report.
In some embodiment modes, determining Bitwidth corresponding to the RI indication field in the CSI report according to a codebook type used by the terminal includes any one or more of the following:
if the codebook type is a single-board type, namely typeI-singlePanel, and corresponds to 1 antenna port, the BitWidth corresponding to the RI indication field is 1;
if the codebook type is typeI-SinglePanel and corresponds to 2 antenna ports, the Bitwidth corresponding to the RI indication field is
Figure BDA0002256743490000141
If the codebook type is typeI-SinglePanel and corresponds to 4 antenna ports, the Bitwidth corresponding to the RI indication field is
Figure BDA0002256743490000142
/>
If the codebook type is typeI-singlePanel, is greater than 4 antenna ports, and the range of Rank is 1 to 4, the BitWidth corresponding to the RI indication field is
Figure BDA0002256743490000143
If the codebook type is typeI-singlePanel, is larger than 4 antenna ports, and the range of Rank is 5 to 8, the Bitwidth corresponding to the RI indication field is
Figure BDA0002256743490000144
If the codebook type is multi-plate type typeI-MultiPanel, the BitWidth corresponding to the RI indication field is
Figure BDA0002256743490000145
If the codebook type is port selection type II-PortSelect, the BitWidth corresponding to the RI indication field is
Figure BDA0002256743490000146
Wherein n is RI Indicates the number of RI values that can be used.
The terminal provided in the embodiment of the present invention may implement the above-described embodiment shown in fig. 4, and the implementation principle and technical effect are similar, which are not described herein again.
Referring to fig. 8, an embodiment of the present invention further provides a network device, where the network device 800 includes:
a receiving module 801, configured to receive a CSI report from a terminal, where the CSI report carries an RI indication field, and the RI indication field indicates whether a network device needs to perform data transmission and a data flow number during network transmission.
In some embodiment, the network device 800 further includes: and the first processing module is used for not scheduling resources for the terminal if the RI indication field indicates that the network equipment does not need to transmit data.
In some embodiment modes, the network device 800 further includes: a first processing module, configured to continue to schedule resources for the terminal if the network device receives an RI indicator field that notifies the network device that data transmission needs to be performed.
In some embodiment modes, when the channel state is smaller than a preset threshold, the RI indication field indicates that the network device does not need to perform data transmission.
In some embodiment, when the RI indication field indicates that the network device does not need to perform data transmission, the CSI report further includes: CRI; alternatively, one or more of the following are not included in the CSI report: PMI, CQI and LI.
The network device provided in the embodiment of the present invention may implement the embodiment shown in fig. 5, and the implementation principle and technical effects are similar, which are not described herein again.
Referring to fig. 9, an embodiment of the present invention further provides a network device, where the network device 900 includes: a second transceiver 901 and a second processor 902.
The second transceiver 901 is configured to receive a CSI report from a terminal, where the CSI report carries an RI indication field, and the RI indication field indicates whether a network device needs to perform data transmission and a data flow number during network transmission.
In some embodiment modes, the second processor 902 is configured to not schedule resources to the terminal if the RI indication field indicates that the network device does not need to perform data transmission.
In some embodiment, the second processor 902 is further configured to continue to schedule resources for the terminal if the network device receives an RI indication field that notifies the network device that data transmission is required.
In some embodiment, when the channel status is smaller than a preset threshold, the RI indication field indicates that the network device does not need to perform data transmission.
In some embodiment, when the RI indication field indicates that the network device does not need to perform data transmission, the CSI report further includes: CRI; alternatively, one or more of the following are not included in the CSI report: PMI, CQI and LI.
The network device provided in the embodiment of the present invention may implement the embodiment shown in fig. 5, and the implementation principle and technical effects are similar, which are not described herein again.
As shown in fig. 10, terminal 1000 shown in fig. 10 includes: at least one processor 1001, memory 1002, at least one network interface 1004, and a user interface 1003. The various components in terminal 1000 are coupled together by a bus system 1005. It is understood that the bus system 1005 is used to enable communications among the components of the connection. The bus system 1005 includes a power bus, a control bus, and a status signal bus, in addition to a data bus. For clarity of illustration, the various buses are designated in figure 10 as the bus system 1005.
The user interface 1003 may include, among other things, a display, a keyboard or a pointing device (e.g., a mouse, trackball, touchpad, or touch screen).
It is to be understood that the memory 1002 in embodiments of the present invention may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of illustration, and not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), double Data rate Synchronous Dynamic random access memory (ddr DRAM), enhanced Synchronous SDRAM (ESDRAM), synchronous link SDRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 1002 of the subject systems and methods is intended to comprise, without being limited to, these and any other suitable types of memory.
In some embodiments, memory 1002 holds the following elements, executable modules or data structures, or a subset thereof, or an expanded set thereof: an operating system 10021 and applications 10022.
The operating system 10021 includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, and is used for implementing various basic services and processing hardware-based tasks. The application 10022 includes various applications, such as a Media Player (Media Player), a Browser (Browser), and the like, for implementing various application services. A program implementing the method of the embodiment of the present invention may be included in the application program 10022.
In an embodiment of the present invention, the steps of the method shown in fig. 4 above are implemented by calling the program or instructions stored in the memory 1002, which may be, in particular, the program or instructions stored in the application 10022.
The terminal provided in the embodiment of the present invention may execute the foregoing processing method embodiment, and the implementation principle and technical effects are similar, which are not described herein again.
Referring to fig. 11, fig. 11 is a structural diagram of a network device applied in the embodiment of the present invention, and as shown in fig. 11, the network device 1100 includes: a processor 1101, a transceiver 1102, a memory 1103, and a bus interface, wherein the processor 1101 may be responsible for managing the bus architecture and general processing. The memory 1103 may store data used by the processor 1101 in performing operations.
In one embodiment of the invention, the network device 1100 further comprises: a computer program stored on the memory 1103 and executable on the processor 1101, the computer program, when executed by the processor 1101, implementing the steps in the method illustrated in fig. 5 or fig. 7 above.
In fig. 11, the bus architecture may include any number of interconnected buses and bridges, with various circuits representing one or more processors, in particular processors 1101, and memories, in particular memories 1103, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1102 may be a plurality of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.
The network device provided in the embodiment of the present invention may execute the foregoing processing method embodiment, and the implementation principle and technical effects are similar, which are not described herein again.
The steps of a method or algorithm described in connection with the disclosure herein may be embodied in hardware or may be embodied in software instructions executed by a processor. The software instructions may be comprised of corresponding software modules that may be stored in RAM, flash memory, ROM, EPROM, EEPROM, registers, hard disk, a removable disk, a compact disk, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. Additionally, the ASIC may reside in a core network interface device. Of course, the processor and the storage medium may reside as discrete components in a core network interface device.
Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in this invention may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass these modifications and variations.

Claims (13)

1. A method for feeding back channel information is applied to a terminal, and is characterized by comprising the following steps:
measuring a channel state;
determining a Rank Indication (RI) indicating domain according to the channel state, wherein the RI indicating domain is used for indicating whether the network equipment needs to carry out data transmission and the number of data streams when the network equipment carries out network transmission;
reporting a Channel State Information (CSI) report to the network equipment, wherein the CSI report carries the RI indication domain;
when the channel state is smaller than a preset threshold value, the RI indication domain indicates that the network equipment does not need to carry out data transmission;
when the RI indication field indicates that the network device does not need to perform data transmission, the CSI report further includes: channel state information reference signal resource indication, CRI; alternatively, one or more of the following are not included in the CSI report: a precoding matrix indicator PMI, a channel quality indicator CQI and a layer indicator LI.
2. The method of claim 1, further comprising:
and determining the bit width BitWidth corresponding to the RI indication domain in the CSI report according to the type of the codebook used by the terminal.
3. The method of claim 2, wherein determining the Bitwidth corresponding to the RI indication field in the CSI report according to the codebook type used by the terminal comprises any one or more of the following:
if the codebook type is a single-board type typeI-singlePanel and corresponds to 1 antenna port, the Bitwidth corresponding to the RI indication field is 1;
if the codebook type is typeI-singlePanel and corresponds to 2 antenna ports, the BitWidth corresponding to the RI indication field is
Figure FDA0003890905370000011
If the codebook type is typeI-SinglePanel and corresponds to 4 antenna ports, the Bitwidth corresponding to the RI indication field is
Figure FDA0003890905370000012
If the codebook type is typeI-singlePanel, is larger than 4 antenna ports, and the range of Rank is 1 to 4, the Bitwidth corresponding to the RI indication field is
Figure FDA0003890905370000021
If the codebook type is typeI-singlePanel, is larger than 4 antenna ports, and the range of Rank is 5 to 8, the Bitwidth corresponding to the RI indication field is
Figure FDA0003890905370000022
If the codebook type is multi-plate type typeI-MultiPanel, the BitWidth corresponding to the RI indication field is
Figure FDA0003890905370000023
If the codebook type is port selection type II-PortSelection, bitWidth corresponding to the RI indication field is
Figure FDA0003890905370000024
Wherein n is RI Indicates the number of RI values that can be used.
4. A method for feeding back channel information is applied to a network device, and is characterized by comprising the following steps:
receiving a CSI report from a terminal, wherein the CSI report carries an RI indication domain which indicates whether network equipment needs to perform data transmission and the number of data streams during network transmission;
when the channel state is smaller than a preset threshold value, the RI indication domain indicates that the network equipment does not need to transmit data;
when the RI indication field indicates that the network device does not need to perform data transmission, the CSI report further includes: a channel state information reference signal resource indication, CRI; alternatively, one or more of the following are not included in the CSI report: a precoding matrix indicator PMI, a channel quality indicator CQI and a layer indicator LI.
5. The method of claim 4, wherein if the RI indicated field indicates that the network device does not need to perform data transmission, the method further comprises:
and not scheduling resources for the terminal.
6. The method of claim 5, wherein after not scheduling resources for the terminal, the method further comprises:
and if the network equipment receives an RI indication domain informing that the network equipment needs to carry out data transmission, continuing to schedule resources for the terminal.
7. A terminal, comprising:
a measuring module for measuring a channel state;
a first determining module, configured to determine, according to the channel state, an RI indication field, where the RI indication field is used to indicate whether a network device needs to perform data transmission and a data flow number when performing network transmission;
a reporting module, configured to report a CSI report to the network device, where the CSI report carries the RI indication field;
when the channel state is smaller than a preset threshold value, the RI indication domain indicates that the network equipment does not need to carry out data transmission;
when the RI indication field indicates that the network device does not need to perform data transmission, the CSI report further includes: a channel state information reference signal resource indication, CRI; alternatively, one or more of the following are not included in the CSI report: a precoding matrix indicator PMI, a channel quality indicator CQI and a layer indicator LI.
8. A terminal, comprising: a first transceiver and a first processor;
the first processor is configured to measure a channel state;
the first processor is further configured to determine, according to the channel state, an RI indication field, where the RI indication field is used to indicate whether a network device needs to perform data transmission and a data flow number during network transmission;
the first transceiver is configured to report a CSI report to the network device, where the CSI report carries the RI indication field;
when the channel state is smaller than a preset threshold value, the RI indication domain indicates that the network equipment does not need to transmit data;
when the RI indication field indicates that the network device does not need to perform data transmission, the CSI report further includes: channel state information reference signal resource indication, CRI; alternatively, one or more of the following are not included in the CSI report: a precoding matrix indicator PMI, a channel quality indicator CQI and a layer indicator LI.
9. A network device, comprising:
a receiving module, configured to receive a CSI report from a terminal, where the CSI report carries an RI indication field, and the RI indication field indicates whether a network device needs to perform data transmission and a data flow number during network transmission;
when the channel state is smaller than a preset threshold value, the RI indication domain indicates that the network equipment does not need to transmit data;
when the RI indication field indicates that the network device does not need to perform data transmission, the CSI report further includes: channel state information reference signal resource indication, CRI; alternatively, one or more of the following are not included in the CSI report: a precoding matrix indicator PMI, a channel quality indicator CQI and a layer indicator LI.
10. A network device, comprising: a second transceiver and a second processor;
the second transceiver is configured to receive a CSI report from a terminal, where the CSI report carries an RI indication field, and the RI indication field indicates whether a network device needs to perform data transmission and a data flow number during network transmission;
when the channel state is smaller than a preset threshold value, the RI indication domain indicates that the network equipment does not need to transmit data;
when the RI indication field indicates that the network device does not need to perform data transmission, the CSI report further includes: channel state information reference signal resource indication, CRI; alternatively, one or more of the following are not included in the CSI report: a precoding matrix indicator PMI, a channel quality indicator CQI and a layer indicator LI.
11. A terminal, comprising: processor, memory and program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the method of channel information feedback according to any of claims 1 to 3.
12. A network device, comprising: processor, memory and program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the method of channel information feedback according to any of claims 4 to 6.
13. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the method of channel information feedback according to any one of claims 1 to 6.
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