CN107707286B - Feedback method and device of channel quality information - Google Patents

Feedback method and device of channel quality information Download PDF

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CN107707286B
CN107707286B CN201610643529.4A CN201610643529A CN107707286B CN 107707286 B CN107707286 B CN 107707286B CN 201610643529 A CN201610643529 A CN 201610643529A CN 107707286 B CN107707286 B CN 107707286B
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channel quality
quality information
unit
carrier
carriers
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CN107707286A (en
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史桢宇
王艺
黄磊
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H04L27/2615—Reduction thereof using coding

Abstract

The invention provides a feedback method and a device of channel quality information, wherein the method comprises the steps of receiving reference signals of a plurality of unit carriers sent by a sending end; determining the overall channel quality information after the aggregation of the plurality of unit carriers according to the reference signals of the plurality of unit carriers; and sending the overall channel quality information to a sending end. The feedback method of the channel quality information provided by the invention is beneficial to selecting a uniform Modulation Coding Scheme (MCS) for the whole bandwidth after carrier aggregation, and is further beneficial to reducing the peak-to-average power ratio (PAPR) after carrier aggregation and improving the reliability of wireless signal transmission.

Description

Feedback method and device of channel quality information
Technical Field
The present invention relates to the field of wireless communication, and in particular, to a method and an apparatus for feeding back channel quality information.
Background
In LTE-advanced (long Term Evolution advanced), in order to support higher uplink and downlink peak rates, a larger transmission bandwidth is required, however, in practice there is little continuous large available bandwidth. Therefore, LTE-Advanced adopts Carrier Aggregation (CA) technology to aggregate multiple Component Carriers (CCs) for higher bandwidth transmission. In addition to the increased bandwidth, another benefit of using carrier aggregation techniques is the efficient use of discrete spectrum. Carrier aggregation in LTE-Advanced currently supports aggregation of a series of different CC combinations, as shown in fig. 1, including aggregation between CCs within the same frequency band, aggregation of CCs that are adjacent or non-adjacent within the same frequency band, and aggregation of CCs within different frequency bands.
The DFT-OFDM (discrete Fourier transform-orthogonal frequency division multiplexing) signal is different from the conventional OFDM (orthogonal frequency division multiplexing) signal, is a signal added with DFT (discrete Fourier transform) before OFDM processing, and has been used in LTE (Long Term Evolution ) mobile communication system and IEEE (Institute of Electrical and Electronics Engineers) 802.11 system, such as uplink transmission for LTE system, recorded as DFT-S-OFDM (digital Fourier transform for OFDM, digital frequency division multiplexing) signal, DFT-OFDM (discrete Fourier transform-orthogonal frequency division multiplexing) signal, or SC (discrete Fourier transform-SC) single carrier frequency division multiplexing signal, single carrier FDMA) signal, often simply referred to as a single carrier signal in practice, is one of the candidate waveforms for a 5G mobile communication system. As shown in fig. 2, for a plurality of data symbols to be transmitted, such as QAM (quadrature amplitude modulation) symbols, a DFT unit performs Discrete Fourier Transform (DFT) first, and outputs a plurality of DFT-transformed symbols to a mapping unit, the mapping unit maps the plurality of DFT-transformed symbols onto a plurality of continuous subcarriers, and then an OFDM unit performs OFDM processing on the mapped plurality of symbols, including IFFT (inverse fast Fourier transform), parallel/serial conversion, cyclic prefix adding, and the like.
Since the single-carrier signal is a signal added with DFT conversion before OFDM processing, the output signal maintains a peak-to-average power ratio (PAPR) close to the data symbol input by DFT by using the conversion characteristics of DFT and IFFT. In addition, in the wireless communication system, because QAM symbols are input to the DFT section and the QAM symbols have a low PAPR, the signal after the DFT-OFDM processing still has a low PAPR.
Under the condition of only one carrier, the distributed subcarriers are continuous, so that the signal output after DFT-OFDM processing has lower PAPR. However, under the scenario of aggregation of multiple carriers, especially when the multiple carriers are discontinuous on the frequency spectrum, the signal output by the existing DFT-OFDM signal processing process no longer maintains a low PAPR. This is because, after the above-described single-carrier signal processing technique is applied to each carrier, a high PAPR is generated after a plurality of single-carrier signals output by a plurality of carriers are superimposed. In order to reduce the PAPR of the output, a certain optimization design can be performed for the single carrier processing procedure. One optimization design method may be to use the same Modulation and Coding Scheme (MCS) on the input of the whole carrier aggregation.
In the existing LTE, generally, a user equipment measures a downlink signal and then feeds back a Channel Quality Indicator (CQI) to select an MCS. And on each non-aggregated carrier, the UE uploads a CQI by taking a unit of a unit carrier or a smaller sub-band as a unit, and according to the indication of the CQI, the base station selects a proper MCS for each CC or the smaller sub-band for data transmission.
The CQI reporting method in the prior art is to use the CQI of a subband as the minimum scheduling unit, and the maximum scheduling unit is based on each CC. The method has the advantages that the scheduling is relatively flexible, in addition, a suitable frequency band can be selected for transmitting data, but the method is not beneficial to selecting a uniform MCS for the whole bandwidth after carrier aggregation, so that the PAPR after carrier aggregation is not beneficial to reducing, and further, the method for reporting the CQI in the prior art is higher in system overhead due to the fact that CC is used as a unit.
Disclosure of Invention
The invention provides a method and a device for feeding back channel quality information, which are favorable for feeding back the channel quality information of the whole bandwidth after carrier aggregation.
In a first aspect, the present invention provides a method for feeding back channel quality information, including:
receiving reference signals of a plurality of unit carriers sent by a sending end; determining the overall channel quality information after the aggregation of the plurality of unit carriers according to the reference signals of the plurality of unit carriers; and sending the overall channel quality information to a sending end.
One element carrier may correspond to one or more reference signals.
With reference to the first aspect, wherein the determining, according to the reference signals of the multiple component carriers, the overall channel quality information after the multiple component carriers are aggregated includes:
respectively determining the channel quality information of each unit carrier according to the reference signal of each unit carrier; calculating an average value or a weighted average value of the channel quality information of the plurality of element carriers; the overall channel quality information is the average or weighted average; or
Respectively determining the channel quality information of each unit carrier according to the reference signal of each unit carrier; the overall channel quality information is the minimum value of the channel quality information of each unit carrier.
The channel quality information of each unit carrier may be a signal-to-noise ratio, a signal-to-interference-and-noise ratio, or a received signal strength indication, and if the overall channel quality information is a channel quality indication CQI defined by a 3GPP (3rd Generation Partnership Project) standard, a corresponding CQI is obtained by looking up a table according to the obtained average value, weighted average value, or minimum value, and is used as the overall channel quality information after carrier aggregation.
If the channel quality information of each unit carrier is the CQI defined by the 3GPP standard, the weighted average or the minimum rounding value is also required to be used as the overall channel quality information after carrier aggregation according to the obtained average, weighted average or minimum rounding value.
With reference to the first aspect, wherein the determining, according to the reference signals of the multiple component carriers, the overall channel quality information after the multiple component carriers are aggregated includes:
averaging or weighted averaging the sum of the channel quality parameters obtained by the plurality of unit carriers on each reference signal, or taking the minimum value of the channel quality parameters obtained by the plurality of unit carriers on the plurality of reference signals; the overall channel quality information is the average value, the weighted average value or the minimum value; or the overall channel quality information is the average value, the weighted average value or the minimum value rounding value.
Compared with the method, the calculation process does not need to calculate the channel quality information of each unit carrier, only calculates the integral channel quality information after carrier aggregation, and saves the calculation cost.
The channel quality parameter may be a signal-to-noise ratio, a signal-to-interference-and-noise ratio, or a received signal strength indication, and if the overall channel quality information is a channel quality indication CQI defined by the 3GPP standard, the corresponding CQI may be obtained by looking up a table according to the obtained average value, weighted average value, or minimum value as the overall channel quality information after carrier aggregation.
With reference to the foregoing aspects, before determining the aggregated overall channel quality information of the multiple component carriers according to the reference signals of the multiple component carriers, the method further includes:
receiving reporting mode indication information sent by a sending end;
the reporting mode indication information is used for indicating that only the aggregated overall channel quality information is reported, or reporting the aggregated overall channel quality information and the channel quality information of each unit carrier; only reporting the aggregated overall channel quality information can save the overhead; in addition, the reporting mode indication information is beneficial to selecting different reporting modes according to different requirements.
If the reporting mode indication information indicates that the aggregated overall channel quality information and the channel quality information of each unit carrier are reported, the serial number of each unit carrier needs to be reported so as to be beneficial to identifying the channel quality information of different unit carriers.
The method is executed by a receiving end, the receiving end is a mobile device, and the transmitting end can be a network device, such as a base station, or a mobile device.
With reference to the foregoing aspects, the channel quality information may be a signal-to-noise ratio, a signal-to-interference-and-noise ratio, a received signal strength indication, or a channel quality indication.
In a second aspect, a method for feeding back channel quality information is provided, including:
receiving reference signals of a plurality of unit carriers on a plurality of beams, which are sent by a sending end;
determining channel quality information after the aggregation of the plurality of element carriers on each beam according to reference signals of the plurality of element carriers on a plurality of beams respectively;
and sending the optimal channel quality information to the sending end.
One element carrier may correspond to one or more reference signals on one beam.
The scheme essentially calculates the channel quality information after carrier aggregation on each beam, and then takes the optimal channel quality information as the whole channel quality information and reports the information.
With reference to the second aspect, wherein the determining, according to the reference signals of the multiple element carriers on multiple beams, the channel quality information after the multiple element carriers are aggregated on each beam includes:
respectively determining the channel quality information of each element carrier on each beam according to the reference signals of the element carriers on the beams; and respectively calculating the channel quality information after the aggregation of the plurality of unit carriers on each beam according to the channel quality information of the plurality of unit carriers on each beam.
In the calculation process, for a single beam, the method for calculating the channel quality information of each unit carrier and the channel quality information after the aggregation of the plurality of unit carriers is the same as that of the first aspect; each beam can be calculated by the calculation method of the first aspect.
With reference to the second aspect, the method further includes sending beam information corresponding to the optimal channel quality information to a sending end.
The methods provided by the above aspects are performed by a receiving end, where the receiving end may be a user equipment, and the transmitting end may be a network device, such as a base station, a wireless access point, and the like, and may also be a user equipment.
In a third aspect, an apparatus for feeding back channel quality information includes:
a receiving module: the device comprises a receiver, a transmitter and a receiver, wherein the receiver is used for receiving reference signals of a plurality of unit carriers sent by the transmitter;
a processing module: the channel quality information of the whole aggregated unit carriers is determined according to the reference signals of the unit carriers;
and the sending module is used for sending the overall channel quality information to a sending end.
With reference to the third aspect, the processing module is specifically configured to:
respectively determining the channel quality information of each unit carrier according to the reference signal of each unit carrier;
calculating an average value or a weighted average value of the channel quality information of the multiple unit carriers; the overall channel quality information is the average or weighted average; or
Respectively determining the channel quality information of each unit carrier according to the reference signal of each unit carrier; the overall channel quality information is the minimum value of the channel quality information of each unit carrier; or
Averaging or weighted averaging the sum of the channel quality parameters obtained by the plurality of unit carriers on each reference signal, or taking the minimum value of the channel quality parameters obtained by the plurality of unit carriers on the plurality of reference signals; the overall channel quality information is the average value, the weighted average value or the minimum value; or the overall channel quality information is the average value, the weighted average value or the minimum value rounding value.
In combination with the above aspect, wherein:
the receiving module is also used for receiving the reporting mode indication information sent by the sending end;
the reporting mode indication information is used for indicating that only the aggregated overall channel quality information is reported, or reporting the aggregated overall channel quality information and the channel quality information of each unit carrier.
The feedback apparatus of channel quality information corresponds to the method execution main body of the first aspect, and the corresponding functional module executes the corresponding step, specifically, the receiving end apparatus.
In a fourth aspect, an apparatus for feeding back channel quality information is provided, including:
a receiving module: the receiving end is used for receiving reference signals of a plurality of unit carriers on a plurality of beams, wherein the reference signals are sent by the sending end;
a processing module: determining channel quality information after the aggregation of the plurality of element carriers on each beam according to reference signals of the plurality of element carriers on a plurality of beams respectively;
a sending module: for sending the optimal channel quality information to the sending end.
With reference to the fourth aspect, the processing module is specifically configured to:
respectively determining the channel quality information of each element carrier on each beam according to the reference signals of the element carriers on the beams;
and respectively calculating the channel quality information after the aggregation of the plurality of unit carriers on each beam according to the channel quality information of the plurality of unit carriers on each beam.
With reference to the fourth aspect, the sending module is further configured to send the beam information corresponding to the optimal channel quality information to a sending end.
The feedback apparatus of channel quality information corresponds to the method execution main body of the second aspect, and the corresponding functional module executes the corresponding step, specifically, the receiving end apparatus.
The unit carrier in each method and device can be a common carrier, and the sending end and the receiving end are respectively a wireless access device and a user device, or the user device and the wireless access device; or both may be user equipment.
According to the signal processing method and the signal processing device, the overall channel quality information after the aggregation of the plurality of unit carriers is determined according to the reference signals of the plurality of unit carriers and is sent to the sending end, so that a uniform MCS can be selected for the overall bandwidth after the aggregation of the carrier, the PAPR after the aggregation of the carrier can be reduced, and the reliability of wireless signal transmission can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the corresponding prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of occupation of multiple carriers on a frequency spectrum.
Fig. 2 is a flowchart illustrating a single carrier signal processing method.
Fig. 3 is a flowchart illustrating a feedback method for providing channel quality information according to an embodiment of the present invention.
Fig. 4 is a flowchart illustrating a feedback method for providing channel quality information according to another embodiment of the present invention.
Fig. 5 is a flowchart illustrating a feedback method for providing channel quality information according to another embodiment of the present invention.
Fig. 6 is a schematic diagram of a feedback apparatus for providing channel quality information according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of a feedback apparatus for providing channel quality information according to another embodiment of the present invention.
Detailed Description
The embodiment of the invention can be used for various wireless networks based on OFDM technology. The radio access network may comprise different network elements in different systems. For example, network elements of a radio Access network in LTE (long Term evolution) and LTE-a (LTE advanced) include an eNB (eNodeB), and network elements of wlan (wireless local area network)/Wi-Fi include an Access Point (AP). Other wireless networks may also use similar schemes as the embodiments of the present invention, except that the relevant modules in the base station system may be different, and the embodiments of the present invention are not limited.
It should also be understood that, in the embodiment of the present invention, the User Equipment (UE) includes, but is not limited to, a Mobile Station (MS), a Mobile Terminal (Mobile Terminal), a Mobile phone (Mobile Telephone), a handset (handset), a portable device (portable Equipment), and the like, and the User Equipment may communicate with one or more core networks via a Radio Access Network (RAN), for example, the User Equipment may be a Mobile phone (or referred to as a "cellular" phone), a computer with a wireless communication function, and the User Equipment may also be a portable, pocket, handheld, built-in computer, or vehicle-mounted Mobile device.
In the LTE system, multiple carriers are allowed to perform carrier aggregation, the number of carriers participating in carrier aggregation is at most 8, the bandwidth of each carrier may be 1.4MHz, 5MHz, 10MHz, or 20MHz, and different bandwidths may be combined at will. In LTE uplink, each user equipment may occupy one PRB (physical resource block) physical resource block in one carrier or multiple PRBs consecutive on the frequency spectrum to transmit data, where each PRB includes 12 consecutive subcarriers and includes 14 OFDM symbols in length, i.e. 1ms in length.
The following description of the embodiments will specifically describe the signaling flow between the base station and the UE. Meanwhile, several methods for calculating the channel information of the whole bandwidth are added in the process for protection. Since the reported information is defined slightly differently in LTE and IEEE standards, the reported information is collectively expressed as channel quality information, and the channel quality information may include information of signal-to-noise ratio (SNR) or signal-to-interference plus noise ratio (SINR) of a received signal, and may include a corresponding CQI value obtained by SNR/SINR, and the like. The fed back channel quality information can be used for selecting MCS, can be used for beam selection indication in a high-frequency system, and can save the feedback quantity.
Taking downlink data transmission of LTE as an example, the main flow of signaling exchange between a base station and a UE is shown in fig. 3, and the method includes:
301, the UE receives a reference signal sent by the base station, and further, may also receive reporting mode indication information sent by the base station;
the base station transmits the reference signal and the indication information to the UE, and the transmission sequence is not limited. The reporting mode indication information is used for indicating the mode adopted by the UE to report the channel quality information; for example: in the embodiment of the present invention, 1 bit is used to indicate the selection of the channel quality information reporting mode, and an existing message, such as a reserved bit in Downlink Control Information (DCI) in the 3GPP standard or a reserved bit in a frame control field (frame control field) in the IEEE802.11 standard, may be used to carry the bit. Here, we mainly consider two reporting modes, the first is a coexistence mode, that is, UE will report the serial number and corresponding channel quality information of each CC and the channel quality information of the whole bandwidth after CC aggregation; the second way is that the UE only reports the channel quality information of the whole bandwidth after CC aggregation. For example, the first mode may be represented by 0, and the second mode may be represented by 1; the base station can select which reporting mode to use according to the sending mode of the data and the actual requirement.
In addition, the base station may not send the indication information, and if not, the first manner or the second manner may be set by default as required.
And the UE selects the mode of the reported channel quality information according to the indication information or default setting of the base station. If the first reporting mode is adopted, the UE needs to report the sequence number and the corresponding channel quality information of each unit carrier, and the channel quality information of the entire bandwidth, that is, the entire channel quality information after carrier aggregation. If the second reporting mode is adopted, the UE only needs to report the whole channel quality information.
302, determining the overall channel quality information after the aggregation of the plurality of element carriers according to the reference signals of the plurality of element carriers;
firstly, the UE calculates the channel quality information on each CC according to a reference signal sent by a base station; there may be 1 or more reference signals per CC.
On the UE side, after receiving a reference signal and reporting mode indication information sent by a base station, firstly, channel quality information on each CC can be calculated based on the reference signal of each carrier;
and then, calculating the overall channel quality information after carrier aggregation on the basis of the channel quality information of each CC.
In this embodiment, a method for calculating the overall channel quality information is provided, assuming that a total of N CCs are aggregated, where CQ is used to represent the channel quality information, and for each CC, a CQ can be obtained based on the reference signalnWhere N is 1,2,3 … N, N CCs may obtain N CQs, where the CQs may be channel quality indicators CQI defined by 3 GPP; then there are several algorithms to obtain the overall channel quality information after carrier aggregation:
1) average value. CQ of the aggregated whole can be obtained by
Figure BDA0001072438370000091
This equation is obtained. Specifically, the overall channel quality information is obtained by averaging the sum of the channel quality information of each CC, and if the aggregated overall channel quality information CQ (including CQs on each CC) refers to a channel quality indicator CQI in the 3GPP standard, the average value also needs to be rounded, and the rounded CQ is used as the overall CQI after carrier aggregation; the CQ on each CC may also be rounded as the CQI of each CC.
2) A weighted average. Expressions can be written as
Figure BDA0001072438370000092
Here the computation is CQ for each componentnMultiplied by a weighting factor alphanThen, adding the obtained average values; as in the above method 1), if the channel quality information CQ is a channel quality indicator CQI in the 3GPP standard, an integer is also required to be taken, and the integer may be taken up or down, and the rounded CQ is used as the overall CQI after carrier aggregation. And here the weighting factor alphanMay be determined by various factors including at least one of the following, for example: the frequency point of the CC, the bandwidth occupied by the CC, the priority of the data, etc.
3) A minimum value. Since a smaller CQ value indicates a lower supported MCS, the lower the data rate, and the more guaranteed the performance. The information quality information of the smallest CQ value among all CQs as a whole can also be selected. The expression may be written as CQ min CQ1,CQ2,...,CQN}。
In the above method, the CQs of the N CCs may also be channel quality parameters such as SNR, SINR, RSSI, and the like, and the calculated average value, weighted average value, or minimum value may be directly used as the overall channel quality information after carrier aggregation by using the above method; the CQI defined by the 3GPP as the overall channel quality information after carrier aggregation may also be obtained by table lookup according to the calculation result.
303, the UE reports the calculated overall channel quality information after carrier aggregation to the base station.
The UE may select the reported channel quality information according to the indication information of the base station in 301. If the first reporting mode is adopted, the UE needs to report the serial number of each CC, the corresponding channel quality information, and the channel quality information of the entire bandwidth after carrier aggregation, that is, the entire channel quality information after carrier aggregation. If the second reporting mode is adopted, the UE only needs to report the whole channel quality information after one carrier aggregation.
If step 301 adopts default setting, reporting channel quality information required by the default setting.
After receiving the channel quality information reported by the UE, the base station selects a suitable MCS or performs scheduling between UEs, which is the prior art and is not described again.
The following embodiment is another way of reporting channel quality information, which is a simplification of the above embodiment. In the reporting method of the channel quality information in the following embodiment, only one entire channel quality information needs to be reported, and therefore, it is not necessary to calculate the channel quality information of each CC, so that the channel quality information of the entire bandwidth, that is, the entire channel quality information after carrier aggregation, may also be directly calculated from the reference signal received on each cell carrier.
The specific process is shown in fig. 4, and includes:
401, the UE receives a reference signal sent by a base station, and further, may also receive reporting mode indication information sent by the base station;
the step is the same as step 301, and is not detailed; the reporting mode indication information indicates that the UE only reports the channel quality information of the whole bandwidth after CC aggregation; or the base station does not send the indication information, and only reports the channel quality information of the whole bandwidth after CC aggregation by default.
The UE only needs to report the entire channel quality information, that is, the entire channel quality information after carrier aggregation, according to the indication information or default setting of the base station.
402, the UE calculates the overall channel quality information after carrier aggregation and reports it to the base station.
If default setting is adopted in step 401, reporting channel quality information required by the default setting.
In this embodiment, a method for calculating the overall channel quality information is provided, assuming that a total of N CCs are aggregated, where CQ is used to represent the channel quality information, and each CC has M reference signals, where N ≧ 1 and M ≧ 1; for each reference signal, the UE may obtain a channel quality parameter, such as SNR value, and thus, each CC may obtain M SNRs, where the SNRs for N CCs are denoted as SNRsn，mWherein N is 1,2,3 …, N, M is 1,2,3, …, M. Then there may be several algorithms:
1) average value. The overall SNR after carrier aggregation can be passed
Figure BDA0001072438370000101
This equation is obtained. Specifically, the overall SNR value is an average value of all SNR values obtained for a plurality of reference signals on a plurality of CCs; then, based on the integral SNR value, integral channel quality information after carrier aggregation is obtained; if the channel quality information is an SNR value, for example, in an IEEE802.11 system, this overall SNR value is used as the overall channel quality information; if the channel quality information is a CQI value, for example, in the 3GPP protocol, an integer obtained by table lookup using this SNR value is used as the channel quality information as a whole.
2) A weighted average. Expressions can be written as
Figure BDA0001072438370000102
Here the measured SNR per reference signal per CCn,mMultiplied by a weighting factor alphanThen, the summed average value is added as the SNR value of the carrier aggregated as a whole, and the weighting factor α is used herenMay be determined by various factors including at least one of the following, for example: the frequency point of the CC where the reference signal is located, the bandwidth of the CC where the reference signal is located, the priority of the data of the CC where the reference signal is located, and the like; as above, if the channel quality information is an SNR valueThe overall SNR value is used as the overall channel quality information, and if the channel quality information is a CQI value, for example, in the 3GPP protocol, an integer obtained by table lookup using the overall SNR value is used as the overall channel quality information.
3) A minimum value. The SNR value that is the lowest of the measured SNRs over all reference signals is selected as the SNR value for the whole, and the expression may be written as SNR min { SNR ═ min }1，1,SNR1,2,...,SNRN,M}. As above, if the channel quality information is an SNR value, the SNR value is used as the channel quality information as a whole, and if the channel quality information is a CQI value, for example, in the 3GPP protocol, an integer obtained by a table lookup method using the SNR value is used as the channel quality information as a whole.
In each of the above calculation methods, if N is 1, the channel quality information of 1 CC is calculated, and may be applied to the embodiment corresponding to step 302 to calculate the channel quality information of a single CC.
In the above method, the channel quality parameter is taken as SNR for example, the channel quality parameter may also be SINR, RSSI (received signal strength indicator), and the like, and certainly, the channel quality parameter is not limited to the above three types, and other parameters may also be provided, and the specific algorithm is similar, and is not described in detail again.
After receiving the channel quality information reported by the UE, the base station selects a suitable MCS or performs scheduling between UEs, which is the prior art and is not described again.
In this embodiment, the step of calculating the channel quality information of each CC by the reference signal is omitted on the UE side, and instead, the channel quality information of the entire bandwidth may be directly calculated by the reference signal. Thereby reducing overhead.
Another embodiment of the present invention is primarily directed to scenarios requiring beamformed transmissions, such as for high frequency systems with a frequency spectrum above 6 GHz. The following behavior example, if there are multiple CCs, each CC has multiple beams; the base station transmits a reference signal in each beam direction of each CC. After receiving the reference signal, the UE calculates one piece of channel quality information for each beam of each CC, then calculates the channel quality information after carrier aggregation for each beam, and selects a beam with the best carrier aggregated channel quality information, and then feeds back both the best beam number and the channel quality information to the base station. Referring to fig. 5, the method includes:
501, a UE receives a reference signal sent by a base station on a plurality of beams aiming at a plurality of CCs;
such as: there are 2 CCs, each CC having 3 beams, and there are 6 sets of reference signals for 3 beams of 2 CCs; of course, if the number of beams may be 1, there are 2 sets of reference signals, which is similar to the two embodiments above; there may be 1 or more reference signals per CC for each beam.
The base station can also send reporting mode indication information to indicate two reporting modes; or a certain reporting mode is adopted by adopting default settings, and the specific mode can refer to the description of step 301 and is not described in detail.
502, the UE calculates channel quality information of each CC on each beam;
if the first reporting mode is adopted, the channel quality information on each CC is calculated for each beam, and for a single CC, the corresponding method in step 302 or the corresponding method in step 402 may be adopted, where N is 1. On each beam, each CC obtains channel quality information by the above method, such as: there are 2 CCs, each with 3 beams, and a total of 6 channel quality information is obtained.
503, the UE calculates the overall channel quality information after aggregation of multiple CCs on each beam, selects the beam with the best channel quality information, and feeds back the channel quality information to the base station;
after the UE calculates one piece of channel quality information for each wave beam of each CC, the UE further calculates the channel quality information on each wave beam after the plurality of CCs are superposed, selects the wave beam with the best channel quality information, and then feeds back the corresponding wave beam number and the corresponding channel quality information to the base station, and of course, the UE can also report the serial number of the CC; for each beam, the way of calculating the channel quality information after the multiple CCs are stacked refers to the corresponding calculation method in step 302 or 402, and is not described in detail here.
The base station may select a suitable beam and a suitable MCS for data transmission based on the optimal channel quality information. The algorithm for calculating the overall channel quality information from the channel quality information of each CC on each beam may use the method mentioned in the above 2 embodiments to calculate several times for several beams, and finally select the optimal channel quality information.
In the above embodiments, downlink transmission is taken as an example for description. The upstream part can be considered peer-to-peer.
The above embodiments describe signaling exchange between the base station and the UE, and since uplink and downlink can be considered as peer-to-peer, they can also be used for MCS selection during transmission between the UE and the base station. Only the base station in the above method flow needs to be changed into the UE, the UE can be changed into the base station, the flow of the signaling is sent from one UE to the base station, and the others are kept unchanged; in addition, the scheme is also suitable for transmission between two user terminals, only the base station in the method flow needs to be changed into the UE, and the signaling flow is sent from one UE to the other UE.
The embodiment of the invention provides the channel quality information reporting the whole bandwidth, and can select a uniform MCS for the whole bandwidth, thereby reducing the PAPR of the transmitted data. In addition, the mode of only uploading the whole channel quality information is used, so that the user does not need to feed back the channel quality information of each CC on each beam, and the reported data overhead can be reduced. In the last embodiment, the calculated uniform channel quality information can be used not only for MCS selection but also for optimal beam selection.
In the above method embodiments, the base station may be other wireless access device, such as a middle AP of a WIFI system; the user equipment may be any mobile equipment, such as a mobile phone, a notebook computer, a vehicle-mounted mobile device, a vr (virtual reality) device, an ar (augmented reality) device, and the like, and the method corresponding to the above embodiment executes the main body, the present invention further provides a signal processing apparatus, referring to fig. 6, where the apparatus includes:
an apparatus for feeding back channel quality information, comprising:
the receiving module 601: the device comprises a receiver, a transmitter and a receiver, wherein the receiver is used for receiving reference signals of a plurality of unit carriers sent by the transmitter;
the processing module 602: the channel quality information of the whole aggregated unit carriers is determined according to the reference signals of the unit carriers;
a sending module 603, configured to send the overall channel quality information to a sending end.
Wherein the processing module is specifically configured to:
respectively determining the channel quality information of each unit carrier according to the reference signal of each unit carrier;
calculating an average value or a weighted average value of the channel quality information of the multiple unit carriers;
the overall channel quality information is the average or weighted average; or
Respectively determining the channel quality information of each unit carrier according to the reference signal of each unit carrier;
the overall channel quality information is the minimum value of the channel quality information of each unit carrier; or
Averaging or weighted averaging the sum of the channel quality parameters obtained by the plurality of unit carriers on each reference signal, or taking the minimum value of the channel quality parameters obtained by the plurality of unit carriers on the plurality of reference signals; the overall channel quality information is the average value, the weighted average value or the minimum value; or the overall channel quality information is the average value, the weighted average value or the minimum value rounding value.
Wherein:
the receiving module is also used for receiving the reporting mode indication information sent by the sending end;
the reporting mode indication information is used for indicating that only the aggregated overall channel quality information is reported, or reporting the aggregated overall channel quality information and the channel quality information of each unit carrier.
The above apparatus corresponds to the user equipment, such as UE, in the method embodiments of fig. 3 and 4, and may also be other types of user equipment; each module executes a corresponding step, which may specifically refer to the method embodiment.
Aiming at the method execution main body of the second method embodiment, the feedback device of the channel quality information is also disclosed, and comprises the following steps:
the receiving module 601: the receiving end is used for receiving reference signals of a plurality of unit carriers on a plurality of beams, wherein the reference signals are sent by the sending end;
the processing module 602: determining channel quality information after the aggregation of the plurality of element carriers on each beam according to reference signals of the plurality of element carriers on a plurality of beams respectively;
the sending module 603: for sending the optimal channel quality information to the sending end.
Wherein the processing module is specifically configured to:
respectively determining the channel quality information of each element carrier on each beam according to the reference signals of the element carriers on the beams;
and respectively calculating the channel quality information after the aggregation of the plurality of unit carriers on each beam according to the channel quality information of the plurality of unit carriers on each beam.
And the sending module is further configured to send the beam information corresponding to the optimal channel quality information to a sending end.
The apparatus corresponds to the user equipment, such as UE, in the method embodiment of fig. 5, or may be other types of user equipment, and each module executes the corresponding step, which may specifically refer to the method embodiment.
The embodiments of the above devices are receiving terminals, and if the receiving terminal is a user equipment, the transmitting terminal is a wireless access device, such as a base station; if the receiving end is the wireless access equipment, the transmitting end is the user terminal; the receiving end and the transmitting end can also be both user equipment.
Still another form of the above apparatus embodiment, referring to fig. 7, includes a processor 702, a receiver 701, a transmitter 703, where the receiver 701 may implement the corresponding functions of the receiving module 601; the processor 702 is configured to perform various types of processing, such as: the corresponding functionality of module 602 may be handled. The transmitter 703 may implement the corresponding functions of the sending module 603. Various flexible design modes can be adopted for specific implementation, and the corresponding functions of each device can be further referred to the embodiment of the method, which is not limited by the invention.
Optionally, the various components of the device in FIG. 7 are coupled together by a bus system that includes a power bus, a control bus, and a status signal bus in addition to a data bus.
It should be understood that, in the embodiments of the present invention, the processor may be a Central Processing Unit (CPU), and the processor may also be other general-purpose processors, Digital Signal Processors (DSPs), application-specific integrated circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory may include both read-only memory and random access memory, and provides instructions and data to the processor. The portion of memory may also include non-volatile random access memory. For example, the memory may also store device type information.
The bus system may include a power bus, a control bus, a status signal bus, and the like, in addition to the data bus. For clarity of illustration, however, the various buses are labeled as a bus system in the figures.
It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (4)

1. A method for feeding back channel quality information, comprising:
receiving reference signals of a plurality of unit carriers on a plurality of beams, which are sent by a sending end;
respectively determining the channel quality information of each element carrier on each beam according to the reference signals of the element carriers on the beams;
respectively calculating the overall channel quality information after the aggregation of the plurality of unit carriers on each beam according to the channel quality information of the plurality of unit carriers on each beam, wherein the channel quality information is used for selecting the MCS corresponding to the beam for data transmission;
and sending the optimal channel quality information to the sending end.
2. The method of claim 1, further comprising transmitting beam information corresponding to the optimal channel quality information to a transmitting end.
3. An apparatus for feeding back channel quality information, comprising:
a receiving module: the receiving end is used for receiving reference signals of a plurality of unit carriers on a plurality of beams, wherein the reference signals are sent by the sending end;
a processing module: respectively determining channel quality information of each unit carrier on each beam according to reference signals of the unit carriers on the beams, and then respectively calculating the channel quality information after the unit carriers are aggregated on each beam according to the channel quality information of the unit carriers on each beam, wherein the channel quality information is used for selecting an MCS corresponding to the beam to perform data transmission;
a sending module: for sending the optimal channel quality information to the sending end.
4. The apparatus of claim 3, wherein the transmitting module is further configured to transmit beam information corresponding to the optimal channel quality information to a transmitting end.
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