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CN107294585B - Feedback method and device of channel state information - Google Patents

Feedback method and device of channel state information Download PDF

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Publication number
CN107294585B
CN107294585B CN201610203734.9A CN201610203734A CN107294585B CN 107294585 B CN107294585 B CN 107294585B CN 201610203734 A CN201610203734 A CN 201610203734A CN 107294585 B CN107294585 B CN 107294585B
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feedback
state information
type
channel state
time
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CN107294585A (en
Inventor
王瑜新
鲁照华
陈艺戬
李儒岳
肖华华
李永
吴昊
蔡剑兴
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2017/077660 priority patent/WO2017167091A1/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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK

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

Abstract

The invention discloses a feedback method and a device of channel state information, wherein the method comprises the following steps: receiving configuration signaling of a base station; the downlink channel state information is fed back to the base station on the predefined or configured time-frequency resource according to the configuration signaling, the problems of waste of a large amount of downlink pilot frequency resource overhead and large feedback quantity caused by the feedback of the channel state information in an LTE-A or 5G communication system in the related technology are solved, and the waste of the downlink pilot frequency resource overhead and the feedback quantity of the terminal are reduced.

Description

Feedback method and device of channel state information
Technical Field
The invention relates to the technical field of intelligent traffic, in particular to a method and a device for feeding back channel state information.
Background
In a Long Term Evolution (LTE) system, a Common Reference Signal (CRS) is used for pilot measurement and data demodulation, i.e., all users use the CRS for channel estimation. When the CRS-based precoding processing method is adopted, the transmitting end needs to additionally notify the receiving end of the information of the specific precoding matrix (which may also be referred to as precoding weight) used during data transmission, and the overhead of the pilot frequency is high. In addition, in a Multi-user Multi-input Multi-output (MU-MIMO) system, since a plurality of terminals use the same CRS, orthogonality of pilots cannot be achieved, and thus interference cannot be estimated.
In an enhanced Long Term Evolution (LTE-a) system, in order to reduce pilot overhead and improve channel estimation accuracy, pilot measurement and data demodulation functions are separated, and two types of reference signals are defined respectively: demodulation Reference Signal (DMRS) and Channel State Information Reference Signal (CSI-RS). The CSI-RS is mainly used for Channel measurement to obtain and feed back Channel quality Information (CQI for short), so that the base station side can use the Information to complete user scheduling and implement adaptive allocation of a Modulation and coding Scheme (MCS for short), and precoding Information is not carried in CSI-RS transmission; the DMRS is mainly used for Channel estimation of a Physical Downlink Shared Channel (PDSCH) and an enhanced Physical Downlink Control Channel (ePDCCH) to complete demodulation of a data/Control Channel, and transmission of the DMRS carries precoding information of the PDSCH/ePDCCH. LTE and LTE-a systems can be divided into Frequency Division Duplex (FDD) and Time Division Duplex (TDD) systems according to the difference between uplink and downlink duplexing modes, and the CSI-RS and DMRS patterns of FDD and TDD systems are different.
Fig. 1 is a diagram illustrating a frame structure of an FDD system according to the related art, where the frame structure of the FDD system shown in fig. 1 includes: a wireless frame of 10 milliseconds (ms) is composed of twenty slots (slots) with the length of 0.5ms and the number of 0-19, and a subframe (subframe) i with the length of 1ms is composed of a slot 2i and a slot 2i + 1. Fig. 2 is a schematic diagram of a frame structure of a TDD system, where, as shown in fig. 2, a 10ms radio frame is composed of two half-frames (half-frames) with a length of 5ms, and each half-frame includes 5 subframes with a length of 1ms, and a subframe i is defined as 2 slots 2i and 2i +1 with a length of 0.5 ms.
In both of the above frame structures, for a standard Cyclic Prefix (normalccp), a slot contains 7 symbols with a length of 66.7 microseconds (us), wherein the CP length of the first symbol is 5.21us, and the CP length of the remaining 6 symbols is 4.69 us; for an Extended Cyclic Prefix (Extended CP), a slot contains 6 symbols, and the CP length of all symbols is 16.67 us. Time unit TsIs defined as T s1/(15000 × 2048) seconds, for each subframe in a radio frame, "D" denotes a subframe dedicated to Downlink transmission, "U" denotes a subframe dedicated to Uplink transmission, "S" denotes a special subframe for three fields, namely, Downlink Pilot Time Slot (DwPTS), Guard Period (GP), and Uplink Pilot Time Slot (UpPTS), whose lengths comply with DwPTS, and whose total length is 30720 · T, GP, and UpPTSs1 ms. Each subframe i is represented by 2 slots 2i and 2i +1, each slot being of length Tslot＝15360·Ts＝0.5ms。
In LTE and LTE-a, the control signaling that needs to be transmitted in uplink has three forms of correct/incorrect response messages (ACK/NACK), and reflects downlink physical Channel State Information (CSI): channel quality indication (CQI for short), precoding matrix indication (PMI for short), and Rank indication (RI for short).
The channel quality indicator CQI plays a key role in the link adaptation process, which is a message sent by the UE to the eNodeB to describe the current downlink channel quality of the UE. The UE may measure the reference symbols sent by the base station and then obtain the CQI through calculation.
A large-scale Multiple Input Multiple Output (Massive MIMO) technology is a key enhancement technology in the next-generation communication technology, and the Massive MIMO system is mainly characterized in that: the base station side is configured with a large-scale antenna array, and can transmit by using more than 8 antennas, for example, 16 antennas, or 32 antennas, or 64 antennas, or even more antennas can be used for transmission. The transmission with more than 8 antennas is the Massive MIMO technology. Using this massive multi-antenna technique, not only is it useful to reduce the interference between user channels, but on the other hand, large arrays can also bring about very considerable array gain and diversity gain. If a plurality of antennas are arranged on a vertical plane to form an area array for transmitting, a space of a base station antenna can be effectively utilized, and a plurality of antennas are placed in a small space, so that the gain of Massive MIMO in the horizontal direction and the gain of Massive MIMO in the vertical direction can be obtained, which is a three-Dimensional Massive multiple input multiple output (3D Massive MIMO) technology or a Full-Dimensional (Full Dimensional MIMO, abbreviated as FD MIMO) technology.
In order to reduce the resource overhead of the downlink pilot and reduce the feedback amount of the UE, the TDD system often obtains the downlink CSI by testing a Sounding Reference Signal (SRS) through channel reciprocity, but for the FDD system, due to the frequency band difference between the uplink and the downlink, the method for obtaining the downlink CSI by measuring the SRS through the channel reciprocity on the base station side becomes very unreliable, which inevitably wastes a large amount of downlink pilot resource overhead and increases the feedback amount of the UE. In addition, the UE feedback method has a significant impact on downlink transmission performance due to PMI quantization error. Based on this, how to feed back the channel state information in the LTE-a or 5G communication system is a problem to be solved at present.
An effective solution is not provided yet for the problems of waste of a large amount of downlink pilot frequency resource overhead and large feedback amount caused by feedback of channel state information in an LTE-a or 5G communication system in the related art.
Disclosure of Invention
The invention provides a feedback method and a feedback device of channel state information, which at least solve the problems of waste of a large amount of downlink pilot frequency resource overhead and large feedback amount caused by the feedback of the channel state information in an LTE-A or 5G communication system in the related technology.
According to an aspect of the present invention, there is provided a feedback method of channel state information, including: receiving configuration signaling of a base station; and feeding back downlink channel state information to the base station on a predefined or configured time frequency resource according to the configuration signaling.
Further, feeding back the downlink channel state information to the base station on the predefined or configured time-frequency resource according to the configuration signaling comprises: according to the configuration signaling, selecting one feedback type or feedback mode from multiple feedback types or feedback modes, and feeding back downlink channel state information to the base station on a predefined or configured time-frequency resource, wherein the feedback type or feedback mode comprises at least one of the following: quantization feedback, non-quantization feedback, feedback of type one, feedback of type two, feedback of type class a, feedback of type class B.
Further, the quantization feedback is a feedback mode or a feedback type that the feedback content includes PMI and/or RI; the non-quantization feedback is a feedback mode or a feedback type of which the feedback content does not contain PMI and/or RI; the feedback of the type one is a feedback mode or a feedback type of which the feedback content comprises PMI and/or RI; the feedback of the type two is a feedback mode or a feedback type of which the feedback content does not contain PMI and/or RI; or the feedback of type two is a feedback mode or a feedback type of which the feedback content contains the PMI and/or the RI, and the feedback of type one is a feedback mode or a feedback type of which the feedback content does not contain the PMI and/or the RI; the feedback of class A is a feedback mode or a feedback type of which the feedback content comprises PMI and/or RI, and the feedback of class B is a feedback mode or a feedback type of which the feedback content does not comprise PMI and/or RI; or the feedback of class B is a feedback mode or a feedback type whose feedback content includes PMI and/or RI, and the feedback of class a is a feedback mode or a feedback type whose feedback content does not include PMI and/or RI.
Further, the predefined or configured time-frequency resources comprise at least one of: the time frequency resource corresponding to the uplink demodulation reference signal DMRS, the time frequency resource corresponding to the time domain symbol adjacent to the time domain symbol occupied by the uplink demodulation reference signal DMRS, the time frequency resource corresponding to the measurement reference signal SRS, all or part of the time frequency resource corresponding to the physical uplink control channel, all or part of the time frequency resource corresponding to the physical uplink shared channel, and the time frequency resource corresponding to the uplink pilot time slot in the special subframe of the time division duplex TDD.
Further, the feeding back the downlink channel state information on the predefined or configured time frequency resource according to the configuration signaling includes one of the following: the downlink channel state information is superposed to the uplink demodulation reference signal DMRS or the measurement reference signal SRS for feedback; multiplying the downlink channel state information to the uplink demodulation reference signal (DMRS) or the measurement reference signal (SRS) for feedback; and mapping the downlink channel state information after frequency domain expansion to all or part of time frequency resources corresponding to a physical uplink control channel or a physical uplink shared channel for feedback.
Further, when the predefined or configured time frequency resource is a time frequency resource corresponding to an uplink pilot timeslot in a special subframe of TDD, feeding back downlink channel state information to the base station on the predefined or configured time frequency resource according to the configuration signaling includes: and sending the SRS on the time-frequency resource corresponding to the uplink pilot time slot of one symbol, and using the uplink pilot time slots of the other one or more symbols to bear the downlink channel state information.
Further, in a case that the predefined or configured time-frequency resource is a time-frequency resource corresponding to the uplink demodulation reference signal DMRS, the method further includes: and when the number of the frequency combs of the uplink demodulation reference signal DMRS is 2, 4 or 8, using 1 or more frequency combs to carry the downlink channel state information.
Further, the using 1 or more frequency combs to carry downlink channel status information includes: and mapping the signals obtained by multiplying the downlink channel state information by the uplink demodulation reference signals DMRS to time-frequency resources corresponding to the 1 or more frequency combs.
Further, the configuration signaling is further configured to indicate whether the terminal needs to feed back the downlink channel state information, where the configuration signaling indicates through one of the following manners: using 1 bit data indicator bit in downlink control signaling, and 5 bits of modulation, coding mode and redundancy version indicator bit to jointly indicate whether the terminal needs to feed back the downlink channel state information; using a CSI request bit and an SRS request bit in a downlink control signaling to jointly indicate whether the terminal needs to feed back the downlink channel state information or not; and indicating whether the terminal needs to feed back the downlink channel state information or not by configuring a feedback period and a subframe offset mode for the terminal through a high-level signaling.
Further, the downlink channel state information includes at least one of: the method comprises the steps that signals received by the terminal on time-frequency resources corresponding to channel state information reference signals CSI-RS, downlink channel information from the base station to the terminal, covariance matrix information of the downlink channel from the base station to the terminal, the largest 1 right singular vector or the largest 2 right singular vector information of the covariance matrix from the base station to the terminal, multi-path direction information of the downlink channel from the base station to the terminal and amplitude information of each path.
According to another aspect of the present invention, there is also provided a method for feeding back channel state information, including: and sending a configuration command to a terminal, wherein the configuration command is used for informing the terminal to feed back downlink channel state information to the base station on a predefined or configured time-frequency resource.
Further, feeding back the downlink channel state information to the base station on a predefined or configured time-frequency resource includes: selecting one feedback type or feedback mode from multiple feedback types or feedback modes to feed back downlink channel state information to the base station on a predefined or configured time-frequency resource, wherein the feedback type or feedback mode comprises at least one of the following: quantization feedback, non-quantization feedback, feedback of type one, feedback of type two, feedback of type class a, feedback of type class B.
Further, the quantization feedback is a feedback mode or a feedback type that the feedback content includes PMI and/or RI; the non-quantization feedback is a feedback mode or a feedback type of which the feedback content does not contain PMI and/or RI; the feedback of the type one is a feedback mode or a feedback type of which the feedback content comprises PMI and/or RI; the feedback of the type two is a feedback mode or a feedback type of which the feedback content does not contain PMI and/or RI; or the feedback of type two is a feedback mode or a feedback type of which the feedback content contains the PMI and/or the RI, and the feedback of type one is a feedback mode or a feedback type of which the feedback content does not contain the PMI and/or the RI; the feedback of class A is a feedback mode or a feedback type of which the feedback content comprises PMI and/or RI, and the feedback of class B is a feedback mode or a feedback type of which the feedback content does not comprise PMI and/or RI; or the feedback of class B is a feedback mode or a feedback type whose feedback content includes PMI and/or RI, and the feedback of class a is a feedback mode or a feedback type whose feedback content does not include PMI and/or RI.
Further, the predefined or configured time-frequency resources comprise at least one of: the time frequency resource corresponding to the uplink demodulation reference signal DMRS, the time frequency resource corresponding to the time domain symbol adjacent to the time domain symbol occupied by the uplink demodulation reference signal DMRS, the time frequency resource corresponding to the measurement reference signal SRS, all or part of the time frequency resource corresponding to the physical uplink control channel, all or part of the time frequency resource corresponding to the physical uplink shared channel, and the time frequency resource corresponding to the uplink pilot time slot in the special subframe of the time division duplex TDD.
Further, the configuration signaling is further configured to indicate whether the terminal needs to feed back the downlink channel state information, where the configuration signaling indicates through one of the following manners: using 1 bit new data indicator bit in the downlink control signaling, and 5 bits of modulation, coding mode and redundancy version indicator bit to jointly indicate whether the terminal needs to feed back the downlink channel state information; using a CSI request bit and an SRS request bit in a downlink control signaling to jointly indicate whether the terminal needs to feed back the downlink channel state information or not; and indicating whether the terminal needs to feed back the downlink channel state information or not by configuring a feedback period and a subframe offset mode for the terminal through a high-level signaling.
Further, the downlink channel state information includes at least one of: the method comprises the steps that signals received by the terminal on time-frequency resources corresponding to channel state information reference signals CSI-RS, downlink channel information from the base station to the terminal, covariance matrix information of the downlink channel from the base station to the terminal, the largest 1 right singular vector or the largest 2 right singular vector information of the covariance matrix from the base station to the terminal, multi-path direction information of the downlink channel from the base station to the terminal and amplitude information of each path.
According to still another aspect of the present invention, there is provided a feedback apparatus of channel state information, including: a receiving module, configured to receive a configuration signaling of a base station; and the feedback module is used for feeding back the downlink channel state information to the base station on the predefined or configured time frequency resource according to the configuration signaling.
Further, the feedback module includes: a first feedback unit, configured to select one feedback type or feedback mode from multiple feedback types or feedback modes according to the configuration signaling, and feed back downlink channel state information to the base station on a predefined or configured time-frequency resource, where the feedback type or feedback mode includes at least one of the following: quantization feedback, non-quantization feedback, feedback of type one, feedback of type two, feedback of type class a, feedback of type class B.
Further, the predefined or configured time-frequency resources comprise at least one of: the time frequency resource corresponding to the uplink demodulation reference signal DMRS, the time frequency resource corresponding to the time domain symbol adjacent to the time domain symbol occupied by the uplink demodulation reference signal DMRS, the time frequency resource corresponding to the measurement reference signal SRS, all or part of the time frequency resource corresponding to the physical uplink control channel, all or part of the time frequency resource corresponding to the physical uplink shared channel, and the time frequency resource corresponding to the uplink pilot time slot in the special subframe of the time division duplex TDD.
Further, the feedback module comprises one of: a second feedback unit, configured to superimpose the downlink channel state information on the uplink demodulation reference signal DMRS or the measurement reference signal SRS for feedback; a third feedback unit, configured to multiply the downlink channel state information to the uplink demodulation reference signal DMRS or the measurement reference signal SRS for feedback; and the fourth feedback unit is used for mapping the downlink channel state information after frequency domain expansion to all or part of time frequency resources corresponding to the physical uplink control channel or the physical uplink shared channel for feedback.
Further, the feedback module is further configured to, when the predefined or configured time-frequency resource is a time-frequency resource corresponding to an uplink pilot timeslot in a special subframe of TDD, send an SRS on the time-frequency resource corresponding to the uplink pilot timeslot of one symbol, and use the uplink pilot timeslots of the remaining one or more symbols to carry the downlink channel state information.
Further, the apparatus further comprises: and a carrying module, configured to, when the predefined or configured time-frequency resource is a time-frequency resource corresponding to the uplink demodulation reference signal DMRS, carry the downlink channel state information using 1 or more frequency combs of the uplink demodulation reference signal DMRS when the number of the frequency combs of the uplink demodulation reference signal DMRS is 2, 4, or 8.
Further, the carrier module includes: and the mapping unit is used for mapping the signal obtained by multiplying the downlink channel state information by the uplink demodulation reference signal DMRS to the time-frequency resources corresponding to the 1 or more frequency combs.
According to still another aspect of the present invention, there is provided a feedback apparatus of channel state information, including: and the sending module is used for sending a configuration command to the terminal, and the configuration signaling is used for informing the terminal to feed back the downlink channel state information to the base station on the predefined or configured time-frequency resource.
According to the invention, the configuration signaling of the base station is received; and feeding back downlink channel state information to the base station on the predefined or configured time-frequency resource according to the configuration signaling, so that the problems of waste of a large amount of downlink pilot frequency resource overhead and large feedback quantity caused by the feedback of the channel state information in an LTE-A or 5G communication system in the related technology are solved, and the waste of the downlink pilot frequency resource overhead and the feedback quantity of a terminal are reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a diagram illustrating a frame structure of an FDD system according to the related art;
fig. 2 is a diagram illustrating a frame structure of an FDD system according to the related art;
fig. 3 is a flowchart of a feedback method of channel state information according to an embodiment of the present invention;
fig. 4 is a block diagram of a feedback apparatus of channel state information according to an embodiment of the present invention;
fig. 5 is a block diagram one of a feedback apparatus of channel state information according to a preferred embodiment of the present invention;
fig. 6 is a block diagram two of a feedback apparatus of channel state information according to a preferred embodiment of the present invention;
fig. 7 is a schematic diagram of feeding back downlink channel state information in an uplink pilot timeslot of a TDD subframe according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
An embodiment of the present invention provides a method for feeding back channel state information, and fig. 3 is a flowchart of the method for feeding back channel state information according to the embodiment of the present invention, as shown in fig. 3, including:
step S302, receiving a configuration signaling of a base station;
step S304, according to the configuration signaling, feeding back the status information of the downlink channel to the base station on the predefined or configured time frequency resource.
Through the steps, receiving a configuration signaling of the base station; the downlink channel state information is fed back to the base station on the predefined or configured time-frequency resource according to the configuration signaling, the problems of waste of a large amount of downlink pilot frequency resource overhead and large feedback quantity caused by the feedback of the channel state information in an LTE-A or 5G communication system in the related technology are solved, and the waste of the downlink pilot frequency resource overhead and the feedback quantity of the terminal are reduced.
Further, feeding back the downlink channel state information to the base station on the predefined or configured time-frequency resource according to the configuration signaling comprises: according to the configuration signaling, selecting one feedback type or feedback mode from multiple feedback types or feedback modes, and feeding back downlink channel state information to the base station on a predefined or configured time-frequency resource, wherein the feedback type or feedback mode comprises at least one of the following: quantization feedback, non-quantization feedback, feedback of type one, feedback of type two, feedback of type class a, feedback of type class B.
Further, the quantized feedback is a feedback mode or a feedback type that the feedback content includes PMI and/or RI; the non-quantization feedback is a feedback mode or a feedback type of which the feedback content does not contain PMI and/or RI; the feedback of the type one is a feedback mode or a feedback type of which the feedback content comprises PMI and/or RI; the feedback of the type two is a feedback mode or a feedback type of which the feedback content does not contain PMI and/or RI; or the feedback of the type two is a feedback mode or a feedback type of which the feedback content contains the PMI and/or the RI, and the feedback of the type one is a feedback mode or a feedback type of which the feedback content does not contain the PMI and/or the RI; the feedback of class A is a feedback mode or a feedback type with the feedback content containing PMI and/or RI, and the feedback of class B is a feedback mode or a feedback type with the feedback content not containing PMI and/or RI; or, the feedback of class B is a feedback mode or a feedback type whose feedback content includes PMI and/or RI, and the feedback of class a is a feedback mode or a feedback type whose feedback content does not include PMI and/or RI.
Further, the predefined or configured time-frequency resource comprises at least one of: the time frequency resource corresponding to the uplink demodulation reference signal DMRS, the time frequency resource corresponding to the time domain symbol adjacent to the time domain symbol occupied by the uplink demodulation reference signal DMRS, the time frequency resource corresponding to the measurement reference signal SRS, all or part of the time frequency resource corresponding to the physical uplink control channel, all or part of the time frequency resource corresponding to the physical uplink shared channel, and the time frequency resource corresponding to the uplink pilot time slot in the special subframe of the time division duplex TDD.
Further, the feeding back the downlink channel state information on the predefined or configured time frequency resource according to the configuration signaling includes one of the following: the downlink channel state information is superposed to the uplink demodulation reference signal DMRS or the measurement reference signal SRS for feedback; multiplying the downlink channel state information to the uplink demodulation reference signal DMRS or the measurement reference signal SRS for feedback; and mapping the downlink channel state information after frequency domain expansion to all or part of time frequency resources corresponding to the physical uplink control channel or the physical uplink shared channel for feedback.
Further, when the predefined or configured time frequency resource is a time frequency resource corresponding to an uplink pilot timeslot in a special subframe of TDD, feeding back downlink channel state information to the base station on the predefined or configured time frequency resource according to the configuration signaling includes: and sending the SRS on the time-frequency resource corresponding to the uplink pilot time slot of one symbol, and using the uplink pilot time slots of the other one or more symbols to bear the downlink channel state information.
Further, in the case that the predefined or configured time frequency resource is a time frequency resource corresponding to the uplink demodulation reference signal DMRS, the method further includes: and when the number of the frequency combs of the uplink demodulation reference signal DMRS is 2, 4 or 8, using 1 or more frequency combs to carry the downlink channel state information.
Further, the using 1 or more frequency combs to carry downlink channel status information includes: and mapping the signal obtained by multiplying the downlink channel state information by the uplink demodulation reference signal DMRS to the time-frequency resources corresponding to the 1 or more frequency combs.
Further, the configuration signaling is further configured to indicate whether the terminal needs to feed back the downlink channel state information, where the configuration signaling indicates through one of the following manners: using 1 bit data indicator bit in the downlink control signaling, and 5 bits of modulation, coding mode and redundancy version indicator bit to jointly indicate whether the terminal needs to feed back the downlink channel state information; using CSI request bit and SRS request bit in downlink control signaling to jointly indicate whether the terminal needs to feed back the downlink channel state information; and indicating whether the terminal needs to feed back the downlink channel state information or not by configuring a feedback period and a subframe offset mode for the terminal through a high-level signaling.
Further, the downlink channel state information includes at least one of: the terminal receives signals on time-frequency resources corresponding to a channel state information reference signal CSI-RS, downlink channel information from the base station to the terminal, covariance matrix information of the downlink channel from the base station to the terminal, maximum 1 right singular vector or maximum 2 right singular vector information of the covariance matrix of the downlink channel from the base station to the terminal, multi-path direction information of the downlink channel from the base station to the terminal and amplitude information of each path.
The embodiment of the invention also provides a feedback method of the channel state information, which comprises the following steps: and sending a configuration command to the terminal, wherein the configuration command is used for informing the terminal to feed back the downlink channel state information to the base station on the predefined or configured time-frequency resource.
Further, feeding back the downlink channel state information to the base station on a predefined or configured time-frequency resource includes: selecting one feedback type or feedback mode from multiple feedback types or feedback modes to feed back downlink channel state information to the base station on a predefined or configured time-frequency resource, wherein the feedback type or feedback mode comprises at least one of the following: quantization feedback, non-quantization feedback, feedback of type one, feedback of type two, feedback of type class a, feedback of type class B.
Further, the quantized feedback is a feedback mode or a feedback type that the feedback content includes PMI and/or RI; the non-quantization feedback is a feedback mode or a feedback type of which the feedback content does not contain PMI and/or RI; the feedback of the type one is a feedback mode or a feedback type of which the feedback content comprises PMI and/or RI; the feedback of the type two is a feedback mode or a feedback type of which the feedback content does not contain PMI and/or RI; or the feedback of the type two is a feedback mode or a feedback type of which the feedback content contains the PMI and/or the RI, and the feedback of the type one is a feedback mode or a feedback type of which the feedback content does not contain the PMI and/or the RI; the feedback of class A is a feedback mode or a feedback type with the feedback content containing PMI and/or RI, and the feedback of class B is a feedback mode or a feedback type with the feedback content not containing PMI and/or RI; or, the feedback of class B is a feedback mode or a feedback type whose feedback content includes PMI and/or RI, and the feedback of class a is a feedback mode or a feedback type whose feedback content does not include PMI and/or RI.
Further, the predefined or configured time-frequency resource comprises at least one of: the time frequency resource corresponding to the uplink demodulation reference signal DMRS, the time frequency resource corresponding to the time domain symbol adjacent to the time domain symbol occupied by the uplink demodulation reference signal DMRS, the time frequency resource corresponding to the measurement reference signal SRS, all or part of the time frequency resource corresponding to the physical uplink control channel, all or part of the time frequency resource corresponding to the physical uplink shared channel, and the time frequency resource corresponding to the uplink pilot time slot in the special subframe of the time division duplex TDD.
Further, the configuration signaling is further configured to indicate whether the terminal needs to feed back the downlink channel state information, where the configuration signaling indicates through one of the following manners: using 1 bit new data indicator bit in the downlink control signaling, and 5 bits of modulation, coding mode and redundancy version indicator bit to jointly indicate whether the terminal needs to feed back the downlink channel state information; using CSI request bit and SRS request bit in downlink control signaling to jointly indicate whether the terminal needs to feed back the downlink channel state information; and indicating whether the terminal needs to feed back the downlink channel state information or not by configuring a feedback period and a subframe offset mode for the terminal through a high-level signaling.
Further, the downlink channel state information includes at least one of: the terminal receives signals on time-frequency resources corresponding to a channel state information reference signal CSI-RS, downlink channel information from the base station to the terminal, covariance matrix information of the downlink channel from the base station to the terminal, maximum 1 right singular vector or maximum 2 right singular vector information of the covariance matrix of the downlink channel from the base station to the terminal, multi-path direction information of the downlink channel from the base station to the terminal and amplitude information of each path.
An embodiment of the present invention provides a feedback apparatus of channel state information, and fig. 4 is a block diagram of the feedback apparatus of channel state information according to the embodiment of the present invention, as shown in fig. 4, including:
a receiving module 42, configured to receive a configuration signaling of a base station;
and a feedback module 44, configured to feed back the downlink channel state information to the base station on a predefined or configured time-frequency resource according to the configuration signaling.
Fig. 5 is a block diagram of a feedback apparatus for channel state information according to a preferred embodiment of the present invention, and as shown in fig. 5, the feedback module 44 includes:
a first feedback unit 52, configured to select one feedback type or feedback mode from multiple feedback types or feedback modes according to the configuration signaling, and feed back downlink channel state information to the base station on a predefined or configured time-frequency resource, where the feedback type or feedback mode includes at least one of the following: quantization feedback, non-quantization feedback, feedback of type one, feedback of type two, feedback of type class a, feedback of type class B.
Further, the predefined or configured time-frequency resource comprises at least one of: the time frequency resource corresponding to the uplink demodulation reference signal DMRS, the time frequency resource corresponding to the time domain symbol adjacent to the time domain symbol occupied by the uplink demodulation reference signal DMRS, the time frequency resource corresponding to the measurement reference signal SRS, all or part of the time frequency resource corresponding to the physical uplink control channel, all or part of the time frequency resource corresponding to the physical uplink shared channel, and the time frequency resource corresponding to the uplink pilot time slot in the special subframe of the time division duplex TDD.
Fig. 6 is a block diagram ii of a feedback apparatus of channel state information according to a preferred embodiment of the present invention, and as shown in fig. 6, the feedback module 44 includes one of the following:
a second feedback unit 62, configured to superimpose the downlink channel state information on the uplink demodulation reference signal DMRS or the measurement reference signal SRS for feedback;
a third feedback unit 64, configured to multiply the downlink channel state information to the uplink demodulation reference signal DMRS or the measurement reference signal SRS for feedback;
a fourth feedback unit 66, configured to map the downlink channel state information after performing frequency domain expansion to all or part of time frequency resources corresponding to the physical uplink control channel or the physical uplink shared channel for feedback.
Further, the feedback module 44 is further configured to, when the predefined or configured time frequency resource is a time frequency resource corresponding to an uplink pilot timeslot in a special subframe of TDD, send an SRS on the time frequency resource corresponding to the uplink pilot timeslot of one symbol, and use the uplink pilot timeslot of the remaining one or more symbols to carry the downlink channel state information.
Further, the apparatus further comprises: and a carrying module, configured to, when the predefined or configured time-frequency resource is a time-frequency resource corresponding to the uplink demodulation reference signal DMRS, use 1 or more frequency combs in the uplink demodulation reference signal DMRS to carry the downlink channel state information when the number of the frequency combs of the uplink demodulation reference signal DMRS is 2, 4, or 8.
Further, the carrier module comprises: and the mapping unit is used for mapping the signal obtained by multiplying the downlink channel state information by the uplink demodulation reference signal DMRS to the time-frequency resources corresponding to the 1 or more frequency combs.
The embodiment of the present invention further provides a device for feeding back channel state information, including: and the sending module is used for sending a configuration command to the terminal, and the configuration signaling is used for informing the terminal to feed back the downlink channel state information to the base station on the predefined or configured time-frequency resource.
The following examples are presented to further illustrate the invention in connection with preferred embodiments.
Example one
In this preferred embodiment, the base station side signals to notify the user equipment to feed back the downlink channel state information on the predefined or configured time frequency resources, where the predefined or configured time frequency resources include: time-frequency resources corresponding to uplink demodulation reference signals (DMRS);
further, when the number of frequency combs of the uplink DMRS is 2, DMRS sequences on 1 frequency comb (e.g., comb0) are used for channel estimation, and the other 1 frequency comb (e.g., comb 1) is used for carrying downlink channel state information that needs to be fed back. For example, if the bandwidth of the uplink scheduling PUSCH is 24 RBs, the DMRS sequence length on comb0 is 24 × 12/2 — 144, the comb0 frequency domain resource may be divided into 6 blocks, and each block independently generates a DMRS sequence with a length of 24; 6 elements of the downlink channel state information can be carried on the comb 1, and each element is subjected to 24-length frequency domain spreading in the frequency domain, so that the interference can be effectively resisted, and the signal quality of the receiving side is enhanced.
Further, when the number of frequency combs of the uplink DMRS is 4, DMRS sequences on 1 frequency comb (such as comb0) are used for channel estimation, and the other 3 frequency combs (such as comb 1, comb 2, comb 3) are used for carrying downlink channel state information that needs to be fed back.
Example two
In this preferred embodiment, the base station side signals to notify the user equipment to feed back the downlink channel state information on the predefined or configured time frequency resources, where the predefined or configured time frequency resources include: time frequency resources corresponding to uplink pilot frequency time slots in special subframes of TDD;
fig. 7 is a schematic diagram of feeding back downlink channel state information in an uplink pilot timeslot of a TDD subframe according to an embodiment of the present invention, and as shown in fig. 7, assuming that 6 UpPTS symbols are configured in a special subframe and the number of SRS comb is configured to be 2, the SRS sequence length on 4 RBs is 4 × 12/2 — 24, and the sequences are b0, b1, …, and b 23. The SRS sequence may be transmitted using the 1 st UpPTS symbol (symbol adjacent to GP), and the 2 nd to 6 th UpPTS symbols carrying elements a0, a1, a2, A3 of downlink channel state information.
EXAMPLE III
In this preferred embodiment, the base station side signals to notify the user equipment to feed back the downlink channel state information on the predefined or configured time frequency resources, where the predefined or configured time frequency resources include: time frequency resources corresponding to an uplink demodulation reference signal (DMRS), time frequency resources corresponding to a measurement reference signal (SRS), all or part of time frequency resources corresponding to a physical uplink control channel, all or part of time frequency resources corresponding to a physical uplink shared channel, and time frequency resources corresponding to an uplink pilot time slot in a special subframe of TDD.
Further, a 1-bit new data indicator bit in the downlink control signaling, a 5-bit modulation and coding mode and a redundancy version indicator bit are used for jointly indicating whether the user terminal needs to feed back the downlink channel state information;
for example, 1-bit new data indicator bit and 5-bit modulation and coding scheme and redundancy version indicator bit in DCI format 0 or DCI format 4 are used (for DCI format 4, 1-bit new data indicator bit and 5-bit modulation and coding scheme and redundancy version indicator bit corresponding to transmission block 1 or transmission block 2 are used), when the value of the new data indicator bit is 1 and the values of the modulation and coding scheme and the redundancy version indicator bit are 29 or 30 or 31, it indicates that analog feedback is triggered, and the user terminal needs to feed back downlink channel state information to the base station.
Or, jointly indicate whether the user terminal needs to feed back the downlink channel state information by using the CSI request bit and the SRS request bit in the downlink control signaling, for example, when the CSI request bit is in a state of "01" or "10" or "11" and the SRS request bit is in a state of "1" or "01" or "10" or "11", it indicates that analog feedback is triggered, and the user terminal needs to feed back the downlink channel state information to the base station.
Example four
In the preferred embodiment, the base station configures a feedback period and a subframe offset mode for the user terminal through a high-level signaling to instruct the user terminal to feed back the downlink channel state information to the base station.
For example, when the sub-frame slot where the user terminal is located satisfies
Figure BDA0000957168410000121
When the relation (2) is obtained, it indicates that the user needs to perform analog feedback in the current subframe. Wherein n issNumbering time slots in radio frames, TAFFor the feedback period, ΔAFIs a subframe offset.
When the downlink channel state information is loaded on the SRS, the configuration is that the simulation feedback period is a subset of the SRS period special for the user; when the downlink channel state information is carried on the PUCCH, if the periodic CQI and the analog feedback are required to be fed back in the current subframe, only the CQI is transmitted to carry out the analog feedback, or only the analog feedback is carried out and the CQI is not transmitted.
EXAMPLE five
In this preferred embodiment, the base station side signals to notify the user equipment to feedback the downlink channel state information to the base station in one feedback similar or feedback manner selected from multiple feedback similar or feedback manners, where the feedback type or feedback manner includes at least one of the following:
quantization feedback, non-quantization feedback, feedback of type one, feedback of type two, feedback of type class a, feedback of type class B.
Wherein, the quantization feedback is a feedback mode or a feedback type of which the feedback content comprises PMI and/or RI; the non-quantization feedback is a feedback mode or a feedback type of which the feedback content does not contain PMI and/or RI;
wherein, the feedback of type one is a feedback mode or a feedback type of which the feedback content comprises PMI and/or RI; the feedback of type two is a feedback mode or a feedback type of which the feedback content does not contain PMI and/or RI; or the feedback of type two is a feedback mode or a feedback type of which the feedback content comprises the PMI and/or the RI; the feedback of type one is a feedback mode or a feedback type that the feedback content does not contain PMI and/or RI
Wherein, the feedback of class A is a feedback mode or a feedback type of which the feedback content comprises PMI and/or RI; the feedback of class B is a feedback mode or a feedback type of which the feedback content does not contain PMI and/or RI; or the feedback of class B is a feedback mode or a feedback type of which the feedback content comprises PMI and/or RI; the feedback of class A is a feedback mode or a feedback type of which the feedback content does not contain PMI and/or RI;
when the signaling indication mode of the base station is quantization feedback or feedback of type one or type class A, the user terminal calculates PMI/RI/CQI by measuring CSI-RS, and then feeds the PMI/RI/CQI back to the base station;
when the signaling indication mode of the base station is non-quantization feedback (or analog feedback) or feedback of type two or class B, the user terminal calculates downlink channel information from the base station to the terminal by measuring CSI-RS, or calculates the maximum 1 right singular vector or the maximum 2 right singular vector information of the covariance matrix information or the covariance matrix of the downlink channel from the base station to the terminal, or calculates the multi-path direction information and the amplitude information of each path of the downlink channel from the base station to the terminal, and then feeds back the multi-path direction information and the amplitude information of each path to the base station;
or, when the signaling indication mode of the base station is non-quantization feedback (or analog feedback) or feedback of type two or class B, the user terminal superimposes or multiplies the received signal on the CSI-RS time-frequency resource on the uplink SRS or uplink DMRS, and feeds back the channel state information to the base station in this way.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (21)

1. A method for feeding back channel state information, comprising:
receiving configuration signaling of a base station;
according to the configuration signaling, selecting one feedback type or feedback mode from multiple feedback types or feedback modes, and feeding back downlink channel state information to the base station on a predefined or configured time-frequency resource, wherein the feedback type or feedback mode comprises at least one of the following: quantization feedback, non-quantization feedback, feedback of type one, feedback of type two, feedback of type class a, feedback of type class B.
2. The method of claim 1,
the quantized feedback is a feedback mode or a feedback type of which the feedback content comprises PMI and/or RI;
the non-quantization feedback is a feedback mode or a feedback type of which the feedback content does not contain PMI and/or RI;
the feedback of the type one is a feedback mode or a feedback type of which the feedback content comprises PMI and/or RI; the feedback of the type two is a feedback mode or a feedback type of which the feedback content does not contain PMI and/or RI; or the feedback of type two is a feedback mode or a feedback type of which the feedback content contains the PMI and/or the RI, and the feedback of type one is a feedback mode or a feedback type of which the feedback content does not contain the PMI and/or the RI;
the feedback of class A is a feedback mode or a feedback type of which the feedback content comprises PMI and/or RI, and the feedback of class B is a feedback mode or a feedback type of which the feedback content does not comprise PMI and/or RI; or the feedback of class B is a feedback mode or a feedback type whose feedback content includes PMI and/or RI, and the feedback of class a is a feedback mode or a feedback type whose feedback content does not include PMI and/or RI.
3. The method according to claim 1, wherein the predefined or configured time-frequency resources comprise at least one of: the time frequency resource corresponding to the uplink demodulation reference signal DMRS, the time frequency resource corresponding to the time domain symbol adjacent to the time domain symbol occupied by the uplink demodulation reference signal DMRS, the time frequency resource corresponding to the measurement reference signal SRS, all or part of the time frequency resource corresponding to the physical uplink control channel, all or part of the time frequency resource corresponding to the physical uplink shared channel, and the time frequency resource corresponding to the uplink pilot time slot in the special subframe of the time division duplex TDD.
4. The method according to claim 3, wherein feeding back the downlink channel state information on the predefined or configured time-frequency resource according to the configuration signaling comprises one of:
the downlink channel state information is superposed to the uplink demodulation reference signal DMRS or the measurement reference signal SRS for feedback;
multiplying the downlink channel state information to the uplink demodulation reference signal (DMRS) or the measurement reference signal (SRS) for feedback;
and mapping the downlink channel state information after frequency domain expansion to all or part of time frequency resources corresponding to a physical uplink control channel or a physical uplink shared channel for feedback.
5. The method of claim 3, wherein when the predefined or configured time frequency resource is a time frequency resource corresponding to an uplink pilot timeslot in a special subframe of TDD, feeding back downlink channel state information to the base station on the predefined or configured time frequency resource according to the configuration signaling comprises:
and sending the SRS on the time-frequency resource corresponding to the uplink pilot time slot of one symbol, and using the uplink pilot time slots of the other one or more symbols to bear the downlink channel state information.
6. The method according to claim 3, wherein in the case that the predefined or configured time-frequency resource is a time-frequency resource corresponding to the uplink demodulation reference signal (DMRS), the method further comprises:
and when the number of the frequency combs of the uplink demodulation reference signal DMRS is 2, 4 or 8, using 1 or more frequency combs to carry the downlink channel state information.
7. The method of claim 6, wherein the using 1 or more frequency combs to carry downlink channel state information comprises:
and mapping the signals obtained by multiplying the downlink channel state information by the uplink demodulation reference signals DMRS to time-frequency resources corresponding to the 1 or more frequency combs.
8. The method according to any one of claims 1 to 7, wherein the configuration signaling is further used to indicate whether the terminal needs to feed back the downlink channel state information, wherein the indication is performed by one of the following manners:
using 1 bit data indicator bit in downlink control signaling, and 5 bits of modulation, coding mode and redundancy version indicator bit to jointly indicate whether the terminal needs to feed back the downlink channel state information;
using a CSI request bit and an SRS request bit in a downlink control signaling to jointly indicate whether the terminal needs to feed back the downlink channel state information or not;
and indicating whether the terminal needs to feed back the downlink channel state information or not by configuring a feedback period and a subframe offset mode for the terminal through a high-level signaling.
9. The method of claim 8, wherein the downlink channel state information comprises at least one of:
the method comprises the steps that signals received by the terminal on time-frequency resources corresponding to channel state information reference signals CSI-RS, downlink channel information from the base station to the terminal, covariance matrix information of the downlink channel from the base station to the terminal, the largest 1 right singular vector or the largest 2 right singular vector information of the covariance matrix from the base station to the terminal, multi-path direction information of the downlink channel from the base station to the terminal and amplitude information of each path.
10. A method for feeding back channel state information, comprising:
sending a configuration command to a terminal, wherein the configuration command is used for informing the terminal to feed back downlink channel state information to a base station on a predefined or configured time-frequency resource;
wherein, feeding back the downlink channel state information to the base station on the predefined or configured time-frequency resource comprises:
selecting one feedback type or feedback mode from multiple feedback types or feedback modes to feed back downlink channel state information to the base station on a predefined or configured time-frequency resource, wherein the feedback type or feedback mode comprises at least one of the following: quantization feedback, non-quantization feedback, feedback of type one, feedback of type two, feedback of type class a, feedback of type class B.
11. The method of claim 10,
the quantized feedback is a feedback mode or a feedback type of which the feedback content comprises PMI and/or RI;
the non-quantization feedback is a feedback mode or a feedback type of which the feedback content does not contain PMI and/or RI;
the feedback of the type one is a feedback mode or a feedback type of which the feedback content comprises PMI and/or RI; the feedback of the type two is a feedback mode or a feedback type of which the feedback content does not contain PMI and/or RI; or the feedback of type two is a feedback mode or a feedback type of which the feedback content contains the PMI and/or the RI, and the feedback of type one is a feedback mode or a feedback type of which the feedback content does not contain the PMI and/or the RI;
the feedback of class A is a feedback mode or a feedback type of which the feedback content comprises PMI and/or RI, and the feedback of class B is a feedback mode or a feedback type of which the feedback content does not comprise PMI and/or RI; or the feedback of class B is a feedback mode or a feedback type whose feedback content includes PMI and/or RI, and the feedback of class a is a feedback mode or a feedback type whose feedback content does not include PMI and/or RI.
12. The method according to claim 10, wherein the predefined or configured time-frequency resources comprise at least one of: the time frequency resource corresponding to the uplink demodulation reference signal DMRS, the time frequency resource corresponding to the time domain symbol adjacent to the time domain symbol occupied by the uplink demodulation reference signal DMRS, the time frequency resource corresponding to the measurement reference signal SRS, all or part of the time frequency resource corresponding to the physical uplink control channel, all or part of the time frequency resource corresponding to the physical uplink shared channel, and the time frequency resource corresponding to the uplink pilot time slot in the special subframe of the time division duplex TDD.
13. The method according to any one of claims 10 to 12,
the configuration signaling is further configured to indicate whether the terminal needs to feed back the downlink channel state information, where the configuration signaling indicates that the terminal needs to feed back the downlink channel state information in one of the following manners:
using 1 bit new data indicator bit in the downlink control signaling, and 5 bits of modulation, coding mode and redundancy version indicator bit to jointly indicate whether the terminal needs to feed back the downlink channel state information;
using a CSI request bit and an SRS request bit in a downlink control signaling to jointly indicate whether the terminal needs to feed back the downlink channel state information or not;
and indicating whether the terminal needs to feed back the downlink channel state information or not by configuring a feedback period and a subframe offset mode for the terminal through a high-level signaling.
14. The method of claim 13, wherein the downlink channel state information comprises at least one of:
the method comprises the steps that signals received by the terminal on time-frequency resources corresponding to channel state information reference signals CSI-RS, downlink channel information from the base station to the terminal, covariance matrix information of the downlink channel from the base station to the terminal, the largest 1 right singular vector or the largest 2 right singular vector information of the covariance matrix from the base station to the terminal, multi-path direction information of the downlink channel from the base station to the terminal and amplitude information of each path.
15. An apparatus for feeding back channel state information, comprising:
a receiving module, configured to receive a configuration signaling of a base station;
a feedback module, configured to feed back downlink channel state information to the base station on a predefined or configured time-frequency resource according to the configuration signaling;
wherein the feedback module comprises:
a first feedback unit, configured to select one feedback type or feedback mode from multiple feedback types or feedback modes according to the configuration signaling, and feed back downlink channel state information to the base station on a predefined or configured time-frequency resource, where the feedback type or feedback mode includes at least one of the following: quantization feedback, non-quantization feedback, feedback of type one, feedback of type two, feedback of type class a, feedback of type class B.
16. The apparatus of claim 15, wherein the predefined or configured time-frequency resources comprise at least one of: the time frequency resource corresponding to the uplink demodulation reference signal DMRS, the time frequency resource corresponding to the time domain symbol adjacent to the time domain symbol occupied by the uplink demodulation reference signal DMRS, the time frequency resource corresponding to the measurement reference signal SRS, all or part of the time frequency resource corresponding to the physical uplink control channel, all or part of the time frequency resource corresponding to the physical uplink shared channel, and the time frequency resource corresponding to the uplink pilot time slot in the special subframe of the time division duplex TDD.
17. The apparatus of claim 16, wherein the feedback module comprises one of:
a second feedback unit, configured to superimpose the downlink channel state information on the uplink demodulation reference signal DMRS or the measurement reference signal SRS for feedback;
a third feedback unit, configured to multiply the downlink channel state information to the uplink demodulation reference signal DMRS or the measurement reference signal SRS for feedback;
and the fourth feedback unit is used for mapping the downlink channel state information after frequency domain expansion to all or part of time frequency resources corresponding to the physical uplink control channel or the physical uplink shared channel for feedback.
18. The apparatus of claim 16, wherein the feedback module is further configured to, when the predefined or configured time-frequency resource is a time-frequency resource corresponding to an uplink pilot timeslot in a special subframe of TDD, send an SRS on the time-frequency resource corresponding to the uplink pilot timeslot of one symbol, and use the uplink pilot timeslot of the remaining one or more symbols to carry the downlink channel state information.
19. The apparatus of claim 16, further comprising:
and a carrying module, configured to, when the predefined or configured time-frequency resource is a time-frequency resource corresponding to the uplink demodulation reference signal DMRS, carry the downlink channel state information using 1 or more frequency combs of the uplink demodulation reference signal DMRS when the number of the frequency combs of the uplink demodulation reference signal DMRS is 2, 4, or 8.
20. The apparatus of claim 19, wherein the carrier module comprises:
and the mapping unit is used for mapping the signal obtained by multiplying the downlink channel state information by the uplink demodulation reference signal DMRS to the time-frequency resources corresponding to the 1 or more frequency combs.
21. An apparatus for feeding back channel state information, comprising:
a sending module, configured to send a configuration command to a terminal, where the configuration signaling is used to notify the terminal to feed back downlink channel state information to a base station on a predefined or configured time-frequency resource;
wherein, feeding back the downlink channel state information to the base station on the predefined or configured time-frequency resource comprises:
selecting one feedback type or feedback mode from multiple feedback types or feedback modes to feed back downlink channel state information to the base station on a predefined or configured time-frequency resource, wherein the feedback type or feedback mode comprises at least one of the following: quantization feedback, non-quantization feedback, feedback of type one, feedback of type two, feedback of type class a, feedback of type class B.
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CN102013959A (en) * 2010-12-01 2011-04-13 北京新岸线无线技术有限公司 Communication method and wireless communication system for realizing multi-user dispatching

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