CN101267384A - Method and device for reducing feedback information volume in self-adapted multi-data stream transmission system - Google Patents
Method and device for reducing feedback information volume in self-adapted multi-data stream transmission system Download PDFInfo
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Abstract
A method for reducing feedback information amount in multi-data stream transmission system is provided, comprising: receiving and decomposing reference signal of a plurality of data streams sent by the sender, calculating the channel quality respectively corresponding with a plurality of data streams, and generating a plurality of channel quality indication information corresponding with channel amount through which the a plurality of data streams pass; carrying out arrangement on generated a plurality of channel quality indication information according to at least one preset arrangement mode, in order to generate channel quality indication information sequence; converting generated channel quality indication information sequence and compressing the converted sequence; selecting an optimal sorting arranging sequence from the converted and compressed channel quality indication information sequence, in order to generate the arranging mode indication information indicating selected optimal arranging sequence and compression result of selected channel quality indication information sequence, so that the arranging mode indication information and the compressed optimal arranging sequence can form feedback information.
Description
Technical field
The present invention relates to a kind of method and apparatus that reduces the feedback information volume under the self-adapted multi-data stream transmission system, particularly in high-speed radiocommunication system, the special nature of conversion is carried out in utilization to the feedback information sequence, according to the physical condition of wireless channel, select the method and apparatus of pattern of rows and columns of required feedback information volume minimum.
Background technology
In high-speed data communication system, multiple data stream transmits simultaneously and can promote efficiency of transmission effectively.Multiple-input and multiple-output (Multiple-Input Multiple-output:MIMO) system promptly is an example of multi-data stream transmission system.The advantage of multi-input multi-output system is a plurality of available subchannels can be provided in the spatial domain, thereby can obtain diversity gain and spatial multiplexing gain by the different transmission technologys such as transmit diversity techniques or space division multiplexing technology etc., improve the error performance of transmission link therefrom, and improve spectrum efficiency etc.
At 3GPP (3 Generation Partner Project: adopted multi-input multi-output system in multinomial motion third generation partner program).In multi-input multi-output system, utilize precoding technique simultaneously a plurality of data flow to be transmitted, under suitable channel status, can improve the transmission rate of channel effectively.
The outstanding feature of wireless channel is its time variation, and promptly the state of channel changes in time.Therefore, all variations that it is believed that of prop root and adjust transmission user adaptively and adjust transmission means of many communication systems of the prior art.Usually, will adjust transmission user adaptively and be called adaptive scheduling; Self adaptation is adjusted transmission means and is comprised adaptive coding and modulation etc.
Generally speaking, above-mentioned adaptive approach all requires transmitting terminal to grasp the information of relevant channel status to some extent.In frequency-division duplex communication system, these channel condition informations are at first estimated by receiving terminal, feed back to transmitting terminal then.For example, at 3GPP TR 25.814 (referring to Physical layeraspects for evolved universal terrestrial radio access (UTRA) V7.1.0,2006-09), the channel information that becomes when receiving terminal is estimated, calculate channel quality indication (Channelquality indicator:CQI) information, and CQI is fed back to transmitting terminal.In multi-input multi-output system, the specific requirement of the concrete form of channel quality indication (CQI) information and adaptive scheduling and adaptive coding, modulation strategy etc. is relevant.For example, channel quality information can comprise: the size of the estimated signal to noise ratio that goes out of receiver; The size of the estimated Signal to Interference plus Noise Ratio that goes out of receiver; Estimate the transmission rate that the gained channel is supported; The received power of reference signal; The interference power size that estimates; The equivalent gain of channel etc.
Fig. 1 shows the schematic diagram based on the communication system of feedback channel quality indication information.Be entitled as " An overview of scheduling algorithmsin MIMO based fourth generation wireless systems " (referring to IEEENetwork what W.Ajib and D.Haccoun delivered, vol.19, no.5, pp.43-48, Sep.-Oct.2005) in the article, and adopt feedback shown in Figure 1 and adaptive scheduling, transmission system among the motion 3GPP R1-070397 of .Nokia company " CQI design and its impact toDL performance ".
As shown in Figure 1.Receiving terminal 100 comprises channel estimator 101 and channel quality computing unit 102.Wherein the signal of 101 pairs of receivers receptions of channel estimator carries out channel estimating, and estimated result is offered channel quality computing unit 102.Channel quality computing unit 102 comes the calculating channel quality according to estimated result, and with the channel quality that obtains as needed feedback information.Feedback information form by appointment is transferred to transmitting terminal by a based on feedback link.
In Fig. 1, transmitting terminal 120 comprises scheduler 110, information source 121, channel encoder 122, modulator 123, and transmitting element 124.At transmitting terminal, scheduler 110 selects optimal user to transmit according to collected a plurality of users' feedback information.In the process of transmission, channel encoder 122 and modulator 123 can be selected suitable bit rate and modulation classification etc. adaptively according to feedback information.
If a plurality of parallel data flow of transmission are appreciated that the different channel statuss that data flow experienced may be inequality in the communication system.For example, in multi-input multi-output system, if utilize precoding technique to transmit a plurality of data flow, the subchannel situation that different data streams experienced is different.In this case, receiving terminal need be estimated the channel status of a plurality of data flow, and these feedback of channel information are arrived transmitting terminal.
Fig. 2 shows the feedback schematic diagram of a plurality of data flow corresponding channel quality information.As shown in Figure 2, at receiver side, multiple data stream receiver 201 is responsible for receiving a plurality of data flow, and estimates the quality of channel that a plurality of data flow experiences.Multiple data stream receiver 201 estimated channel qualities are provided for the channel quality calculator 202 (1), 202 (2) of corresponding each data flow ..., 202 (M)).Channel quality calculator 202 (1) calculates the channel quality indication (CQI) information of first data flow; Channel quality calculator 202 (2) is responsible for calculating the channel quality indication (CQI) information of second data flow, and the like.At last, the channel quality indication (CQI) information with a plurality of data flow feeds back to transmitting terminal.
Can improve transmission rate though transmit a plurality of data flow simultaneously, also increase feedback load simultaneously.For example, when transmitting M data flow simultaneously, the M the when total amount of the channel quality indication (CQI) information of feedback is the transmission individual traffic doubly.The increase of feedback information volume has increased the load of based on feedback link, and this is to the high speed data transmission system adverse factors.For example, 3GPP TR 25.814, Physicallayer aspects for evolved universal terrestrial radio access (UTRA) V7.1.0,2006-09. in point out, in 3GPP speech system for a long time, the transmission bandwidth resource of up link is limited, so user terminal need reduce the quantity of feedback information as far as possible.
In order to reduce the feedack amount, can compress feedback information.Fig. 3 shows the schematic diagram of the process that channel quality indication (CQI) information is compressed.The data flow that receiver 301 receiving end/sending ends send.The channel quality indication (CQI) information of channel estimating and channel quality calculator 302 estimation quality of channel that a plurality of data flow experienced and calculated data stream.Channel quality indication (CQI) information compressor reducer 303 compresses channel quality information by certain mode.By such method, can reduce the load of based on feedback link to a certain extent.In Fig. 3, channel quality indication (CQI) information compressor reducer 303 can have multiple implementation.For example, in 3GPP R1-061991.Intel Corporation " A LowFeedback Scheme for Precoding " and 3 GPP R1-062954.LG Electronics. " Analysis on DCT based CQI reporting Scheme ", adopt diverse ways to reduce the quantity of feedback information.
Present widely used feedback information compression method is earlier the sequence that original feedback information constituted to be carried out conversion, then the sequence after the conversion is compressed.A kind of compression method is the less composition of energy in the sequence that abandons after the conversion.In these class methods, the channel quality indicator sequence of the size of feedback load after by conversion determines.For example, can adopt discrete cosine transform to reduce feedback load.If the concentration of energy of the sequence after the conversion is in a few sequential element, promptly on the element of the feedback information sequence after the conversion, compressing feedback information largely then.Otherwise compression effects is relatively poor.Along with the continuous variation of channel condition, receiving terminal channel quality indication (CQI) information measured and estimation also can constantly change, and therefore, the validity of above-mentioned compression algorithm also can change.
In multi-data stream transmission system, feedback load is bigger than single data stream transmission system.Therefore, must compress the pairing channel quality information of a plurality of data flow.Fig. 4 shows the schematic diagram that the multiple data stream feedback information is compressed independently.As shown in Figure 4, multiple data stream receiver 401 at first receives the signal of a plurality of data flow and decomposes, and the signal of a plurality of data flow that will decompose send to channel estimating and channel quality calculator 402 (1,2 ..., M).Wherein, channel estimating and channel quality calculator 402 (1) calculate the estimation and the channel quality of channel that first data flow experiences.Channel estimating and channel quality calculator 404 (2) calculate the estimation and the channel quality of second channel that data flow experiences, and the like.After this, channel quality indication (CQI) information compressor reducer 403 (1,2 ..., M) channel quality indication (CQI) information of respectively each channel quality calculator 402 being exported compresses.Channel quality indication (CQI) information compressor reducer 403 (1) carries out conversion to the sequence that first data flow channel quality indication is constituted, and compresses then, and the feedback information after will compressing is at last delivered to based on feedback link and sent.Equally, channel quality indication (CQI) information compressor reducer 403 (2) carries out conversion to the sequence that second data flow channel quality indication constituted, and compresses then, and the feedback information after will compressing is at last delivered to based on feedback link and sent; And the like.
Be appreciated that to transmitting terminal feedack amount be the summation of the needed feedback information of each data flow.The problem of said method is that its feedback load is bigger.For example, the feedback information bits number after compression in the single data stream transmitting system is when being B, and the total bit number that transmits a plurality of data flow feedback informations after compressing in the system of M data flow at the same time will be MB.
Proposed a kind of multiple data stream feedback information compress algorithm among the 3GPP R1-070187.Panasonic. " DCT Partitioning for CQI Reporting ", Fig. 5 shows the schematic diagram that this multiple data stream channel quality indication (CQI) information connects the feedback method of back compression.
As shown in Figure 5, channel estimating is identical with the process shown in Fig. 4 with the operation before the channel quality calculator, in the description of this omission to it.After the calculating of the estimation of finishing the channel that each data flow is experienced and channel quality, channel quality indication (CQI) information connector 504 joins end to end into long sequence with the feedback information sequence of all data flow.This sequence comprises the channel quality indication (CQI) information of all data flow.The sequence that 505 pairs of channel quality indication (CQI) information connectors 504 of channel quality indication (CQI) information compressor reducer are exported is carried out conversion and compression, and the feedback information after will compressing is delivered to based on feedback link and sent.
Said method is compared with the method for the channel quality information that compresses different data streams independently, reduced feedback load, but still there is following problem in this method: first, to connect corresponding to the channel quality indicator sequence of different data streams, may introduce discontinuity point in sequence, this can cause after carrying out conversion, connects the unnecessary composition of channel quality indicator sequence appearance that the back constitutes, thereby reduce the efficient of compression algorithm, shown in Fig. 6 a and 6b.The second, do not use the correlation properties of channel that different data streams experiences, and this correlation properties are present in the multi-data stream transmission system.
Fig. 7 is the channel quality correlation properties schematic diagram in the multicarrier multi-data stream transmission system, shows in the data flow that comprises the multicarrier multiple-input and multiple-output example of the correlation properties of different channels that data flow experiences.As shown in Figure 7, the data flow that is included in the multicarrier multiple-input and multiple-output exists two kinds of correlations.First kind of correlation (in Fig. 7, representing) that is same data flow at the channel quality on the different frequency bands by the dotted line curved arrow; Second kind is the correlation (being represented by the solid line curved arrow in Fig. 7) of the channel quality of different data streams on the identical frequency band.The former is mainly by decisions (referring to Fig. 7) such as frequency domain feedback granularity and channel coherence bandwidths, the latter is by decisions such as channel circumstance and multiple data stream transmission methods, during for example based on the precoding of channel singular value decomposition, correlation is by the relevant decision between the singular value of channel matrix.Coherence bandwidth is by the time delay expansion decision of channel.Channel circumstance, for example, spatial correlation is determined by factors such as physical environment and antenna structures.
Though said method can reduce feedback information volume, transmit at the same time in the system of a plurality of data flow, still exist the bigger problem of feedback load.
Summary of the invention
The objective of the invention is at the big problem of multi-data stream transmission system feedback load, a kind of method and apparatus that reduces the feedback information volume in the multi-data stream transmission system is provided, can utilize the time-varying characteristics of feedback information compression algorithm feature and channel, adjust the permutation and combination method of a plurality of data flow channel quality indication (CQI) informations adaptively, reach the purpose that reduces feedback quantity.
According to an aspect of the present invention, a kind of method that reduces the feedback information volume in the multi-data stream transmission system is provided, comprise step: the reference signal that receives and decompose a plurality of data flow of transmitting terminal transmission, calculate a plurality of data flow corresponding channel quality respectively, and the corresponding a plurality of channel quality indication (CQI) informations of channel quantity that experienced of generation and a plurality of data flow; According to predetermined at least a pattern of rows and columns a plurality of channel quality indication (CQI) informations that produced are arranged, produced the channel quality indication (CQI) information sequence; The channel quality indication (CQI) information sequence that is produced is carried out conversion, then the sequence through conversion is compressed; From optimal alignment sequence through selection predetermined quantity the channel quality indication (CQI) information sequence of described conversion and compression, produce the result of the compression of pattern of rows and columns indication information of pattern of rows and columns of the selected optimal alignment sequence of indication and selected channel quality indication (CQI) information sequence, constitute feedback information by the optimal alignment sequence of described pattern of rows and columns indication information and compression.
According to another aspect of the present invention, a kind of method that reduces the feedback information volume in the multi-data stream transmission system is provided, comprise step: receiving terminal receives the reference signal of a plurality of data flow, by reference signal the channel conditions between transmitting terminal and the receiving terminal is estimated, and calculated the channel quality indication (CQI) information of a plurality of data flow on different frequency range; According at least a predetermined arrangement pattern the channel quality indication (CQI) information of described a plurality of data flow is arranged, to produce the channel quality indication (CQI) information sequence; The channel quality indication (CQI) information sequence that produces is carried out conversion, and the sequence through conversion is compressed; From the optimal alignment sequence of channel quality indication (CQI) information sequence selection predetermined quantity of compression, produce pattern of rows and columns indication information of pattern of rows and columns of the selected optimal alignment sequence of indication; Optimal alignment sequence and described pattern of rows and columns indication information of compressed described predetermined quantity are constituted feedback information.
According to a further aspect of the invention, a kind of device that reduces the feedback information volume in the multi-data stream transmission system is provided, comprise: channel estimating and channel quality computing unit, be used for the reference signal of a plurality of data flow of receiving is carried out channel estimating, calculate a plurality of data flow corresponding channel quality respectively, and the corresponding a plurality of channel quality indication (CQI) informations of channel quantity that experienced of generation and a plurality of data flow; The channel quality indication (CQI) information arrangement units is used for according to predetermined at least a pattern of rows and columns a plurality of channel quality indication (CQI) informations that produced being arranged, and produces the channel quality indication (CQI) information sequence; The channel quality indication (CQI) information compression unit is used for the channel quality indication (CQI) information sequence that is produced is carried out conversion, then the sequence through conversion is compressed; Channel quality indication (CQI) information pattern of rows and columns selected cell, be used for from selecting the optimal alignment sequence of predetermined quantity through the channel quality indication (CQI) information sequence of described conversion and compression, the result of pattern of rows and columns indication information of pattern of rows and columns of the selected optimal alignment sequence of generation indication and the compression of selected channel quality indication (CQI) information sequence; With the feedback information constructor, be used for the optimal alignment sequence of pattern of rows and columns indication information and compression is constituted feedback information.
According to a further aspect of the invention, provide a kind of method that reduces the feedback information volume in the multi-data stream transmission system, comprise step: receiving terminal receives the reference signal of a plurality of data flow, calculates the channel matter indication information of the channel of a plurality of data flow of transmission; According at least a predetermined arrangement pattern the channel quality indication (CQI) information of described a plurality of data flow is arranged, to produce the channel quality indication (CQI) information sequence; The channel quality indication (CQI) information sequence of arranging is carried out conversion and compression; From the optimal alignment sequence of channel quality indication (CQI) information sequence selection predetermined quantity of compression, and produce pattern of rows and columns indication information of pattern of rows and columns of the selected optimal alignment sequence of indication; Optimal alignment sequence and the described pattern of rows and columns indication information selected are constituted feedback information.
According to the present invention, in feedback information, comprise feedback information after the quantification and two parts of pattern of rows and columns indication of feedback information sequence.Transmitting terminal is indicated based on pattern of rows and columns, and the channel quality information that receives is carried out demodulation, and finishes scheduling or adaptive coding and modulation etc.Under the channel condition that changes, the present invention has reduced feedback load effectively.The present invention is applicable to the high-speed radiocommunication system under the various honeycomb systems, and the high throughput wireless local area network system.
Description of drawings
By below in conjunction with description of drawings the preferred embodiments of the present invention, will make above-mentioned and other purpose of the present invention, feature and advantage clearer, wherein:
Fig. 1 is based on the schematic diagram of the communication system of the quality indication (CQI) information of feedback channel in the prior art;
Fig. 2 is the feedback schematic diagram of a plurality of data flow corresponding channel quality information in the prior art;
Fig. 3 is the schematic diagram of channel quality indication (CQI) information compression process in the expression prior art;
Fig. 4 is the schematic diagram of the feedback method of multiple data stream quality of channel indication information independent compression in the expression prior art;
Fig. 5 is the schematic diagram that multiple data stream quality of channel indication information connects the feedback method of back compression in the expression prior art;
Fig. 6 a and 6b are illustrated in the schematic diagram that channel quality is indicated discontinuity point introducing superfluous signal component in the process of conversion;
Fig. 7 is the schematic diagram of the channel quality correlation properties in the expression multicarrier multi-data stream transmission system;
Fig. 8 is the feedback information compression method of optimal alignment mode is selected in expression according to the embodiment of the invention a schematic diagram;
Fig. 9 is the schematic diagram of expression according to the feedback information constituted mode of the embodiment of the invention;
Figure 10 is the block diagram of expression according to the device of the formation feedback information of the embodiment of the invention; With
Figure 11 a to 11h is the schematic diagram of expression according to the comparative result of the original feedback information sequence of different feedback methods and reconstruct feedback information sequence
Embodiment
With reference to the accompanying drawings embodiments of the invention are elaborated, having omitted in the description process is unnecessary details and function for the present invention, obscures to prevent that the understanding of the present invention from causing.
At first, carry out the process of feedback information in the description communication system between transmitting terminal and the receiving terminal.Be that example is described the present invention with the high-speed radiocommunication system that adopts multiple-input and multiple-output and OFDM below.Be noted that the high-speed radiocommunication system that the invention is not restricted to multiple-input and multiple-output and OFDM, and can be applied to the communication system that other need reduce feedback information.Can suppose to comprise in multiple-input and multiple-output and the ofdm system transmitting terminal and a plurality of receiving terminal, all dispose a plurality of antennas at transmitting terminal and receiving terminal.In this system, can utilize methods such as spatial domain precoding to transmit a plurality of data flow simultaneously.
In high speed data transmission system, in order to overcome the influence of multipath channel, adopt the method for OFDM, the information dispersion of each data flow is transmitted to different frequency bands.Each receiving terminal receives reference signal, by reference signal the channel situation between transmitting terminal and the receiving terminal is estimated.Based on the estimation to channel, each receiving terminal need calculate the channel quality indication (CQI) information of different data streams on different frequency range.Receiving terminal is configured to a channel quality indication (CQI) information sequence with the channel quality indication (CQI) information of same data flow on different frequency range.Like this, for a plurality of data flow, one co-exists in a plurality of channel quality indication (CQI) information sequences corresponding with the quantity of data flow.
Receiving terminal need carry out suitable compression to these feedback informations, and feeds back to transmitting terminal.Transmitting terminal selects one or more suitable receiving terminal to carry out transfer of data from a plurality of receiving terminals according to the feedback information of being received.In addition, transmitting terminal is adjusted transmission policy also according to the feedback information that receives.For example, adjust channel coding rate and modulation classification etc.In this system, the frequency domain granularity of feedback information can be regulated, and a basic frequency domain feedback unit can comprise one or one group of subcarrier.
According to embodiments of the invention, receiving terminal at first carries out conversion to this sequence when carrying out the compression of feedback information sequence, the sequence after the conversion is compressed, and the sequence after will compressing then feeds back to transmitting terminal.The feature of above-mentioned conversion is: after original channel quality indication (CQI) information sequence was carried out conversion, the energy of wherein a part of element of channel quality indication (CQI) information sequence was less after the resultant conversion, and the energy of another part element is bigger.In other words, the energy of the channel quality indication (CQI) information sequence after the conversion concentrates on certain a part of element of sequence to a certain extent.Conversion with this character can apply in the compression algorithm of feedback information.Exemplary with conversion of this character is discrete cosine transform, sub-band transforms etc.
In other words, can utilize modes such as discrete cosine transform or sub-band transforms that channel quality indication (CQI) information is carried out conversion, the energy of a part of element in the sequence after making it have conversion is less, and the bigger characteristic of the energy of another part element.Should be noted that, other transform method also can be applied to channel quality indication (CQI) information is carried out conversion, for example: can adopt hadamard transform (HadamardTransform), fractal transformation and carry out conversion based on the relevant modes such as motion compensation encoding of interframe.Other conversion with similar quality also can be applied in the compression algorithm of feedback information.
According to embodiments of the invention, the method that reduces feedback information volume is comprised two aspects: first aspect is before the channel quality indication (CQI) information sequence is carried out conversion, by only mode the channel quality indication (CQI) information sequence of different data streams is arranged; Second aspect according to arrangement mode structure arrangement mode indication information, and utilizes channel quality indication (CQI) information and arrangement mode indication information after the compression to constitute feedback information.
Fig. 8 shows the schematic diagram of selecting the feedback information compression method of optimal alignment mode according to the embodiment of the invention.In other words, Fig. 8 showed before the channel quality indication (CQI) information sequence is carried out conversion, the process of the channel quality indication (CQI) information sequence of different data streams being arranged by only mode.In Fig. 8, shown in the square frame 801 that dotted line constitutes, receiving terminal receives a plurality of data flow by a plurality of frequency band transmission, and the data flow that receives is carried out channel estimating, and calculates the channel quality indication (CQI) information 801 corresponding to different data streams and different frequency bands.Calculating the channel quality information of gained arranges according to the different pattern of N (N is that integer and N are not less than 1) kind.Two kinds of different pattern of rows and columns have been listed in the square frame 802 and 803.
In square frame 802, according to arranging the channel quality indication (CQI) information of same data flow at first in order at different frequency bands, then arrange the channel quality indication (CQI) information of the different frequency bands of next data flow then, and the like, channel quality indication (CQI) information to whole a plurality of data flow is arranged, and constitutes the channel quality indication (CQI) information sequence.Channel quality indication (CQI) information under this pattern of rows and columns is carried out conversion such as discrete cosine transform.After this, select energy is bigger in the sequence element, and feedback information is compressed, thereby finish the compression (as shown in Figure 3) of feedback information, obtain needing M altogether after the compression as feedback information
1Individual feedback factor.
Similarly, can adopt different arrangement modes, obtain needing M altogether after the compression
NIndividual feedback factor.
Next, receiving terminal carries out the selection of optimal alignment pattern.Shown in square frame 804, select the minimum pattern of rows and columns of the compression required feedback information volume in back, and write down sequence number of selected pattern of rows and columns and the channel quality indication (CQI) information sequence after the compression.In the present embodiment, employed pattern of rows and columns is meant the multiple possible arrangement mode to the channel quality indication (CQI) information sequence of different data streams on different frequency subchannel (perhaps other forms of subchannel).The common feature of the various pattern of rows and columns among the present invention is earlier the element of the channel quality indication (CQI) information sequence of different data streams on different frequency subchannel (perhaps other forms of subchannel) to be broken.Then, be base unit with the individual element of original series, recombinate, obtain the sequence after the new arrangement.Sequence length after the arrangement equates with the length sum of the channel quality indication (CQI) information sequence of arranging preceding all data flow.Sequence after the arrangement, its adjacent element may belong to different data streams, also may belong to same data flow.
On the other hand, predetermined at least a pattern of rows and columns is earlier the element of the channel quality indication (CQI) information sequence of different data streams on the different frequency subchannel to be broken, individual element with original series is a base unit, recombinates, and obtains the sequence after the new arrangement.To the new sequence that obtains, adopt certain predetermined pattern to carry out the deletion of element or carry out the interpolation of element, the length of the new sequence that obtains and the length of original series are unequal.The adjacent element of the sequence after the arrangement can belong to different data streams, also can belong to same data flow.
In the present invention, the number of the predetermined pattern of rows and columns that is adopted can be provided with by system.The mode that is provided with can be after being scheduled to, and in system's running, no longer changes the number of pattern of rows and columns, and the constituted mode of pattern of rows and columns; The number and the constituted mode of the predetermined arrangement patterns that adopt also can under the control of the relevant control module of network, in predetermined some kinds possible pattern of rows and columns set, switch in system's running more.For example, in the table 1 below, the possible pattern of rows and columns set of M kind is arranged, in these set, number of the pattern of rows and columns that comprises and constituted mode can be inequality.
Table 1
| Pattern of rows and columns set numbers | The number of the predetermined pattern of rows and columns that is comprised in pattern of rows and columns set | When adopting this pattern of rows and columns set, arrange the bit number of indication information in the |
| 1 | 1 | 0 |
| 2 | 2 | 1 |
| 3 | 3 | 2 |
| 4 | 4 | 2 |
| …… | …… | …… |
| M | X (value of X can be selected as required) | Be not less than Log 2(X) smallest positive integral |
Simultaneously, when adopting these possible pattern of rows and columns set, in final feedback information of constructing, the length that is used for pattern of rows and columns indication information also can be different.In these possible pattern of rows and columns set, the switching of being carried out, its purpose and foundation may be to reduce the processing complexity of terminal in calculating the feedback information process, also may be the total amounts that reduces feedback information.Described switching in when implementing can be carried out switching controls at single terminal, also the control that can switch simultaneously at a plurality of terminals.
Several possible arrangement modes are: different data streams corresponding channel quality indication information sequence is carried out connecting sequentially; Different data streams corresponding channel quality indication information sequence is staggered, and when being staggered, is unit with the individual element of original channel quality indication (CQI) information sequence; Different data streams corresponding channel quality indication information sequence is staggered, and when being staggered, is unit with a plurality of elements of original channel quality indication (CQI) information sequence.The number of all possible pattern of rows and columns can be adjusted the requirement of feedback load and receiving terminal algorithm complex according to system.
Fig. 9 illustrates the process according to the formation feedback information of the embodiment of the invention.Process shown in Figure 9 promptly, according to arrangement mode structure arrangement mode indication information, and utilizes channel quality indication (CQI) information and arrangement mode indication information after the compression to constitute feedback information corresponding to the second aspect that reduces feedback information volume.
As shown in Figure 9, dashed rectangle 901 comprises after by only mode the channel quality indication (CQI) information sequence of different data streams being arranged and compress through process shown in Figure 8, resulting M
*Individual feedback factor.Can suppose that each coefficient needs the B bit quantization.Square frame 902 comprises pattern of rows and columns indication information.Can suppose the total possible arrangement mode of N kind.Therefore, pattern of rows and columns indication information comprises log
2The N bit.So feedback information comprises (BM altogether
*+ log
2N) bit.
By the process shown in Fig. 8 and 9, can constitute the feedback information of the minimizing feedback information volume that obtains according to the present invention.
Figure 10 shows the block diagram according to the device of the formation feedback information of the embodiment of the invention.
As shown in figure 10, according to embodiments of the invention, the device that constitutes feedback information comprises most stream receivers 101, and channel estimating and channel quality calculator 102 (comprise channel estimating and channel quality calculator 102
1, 102
2..., 102
M), channel quality indication (CQI) information arrangement machine 103 (comprises channel quality indication (CQI) information arrangement machine 103
1, 103
2..., 103
N), channel quality indication (CQI) information compressor reducer 104 (comprises channel quality indication (CQI) information compressor reducer 104
1, 104
2..., 104
N), channel quality indication (CQI) information pattern of rows and columns selector 105 and feedback information constructor 106.
According to the device of the feedback information of present embodiment, the signal of the multiple data stream that multiple data stream receiver 101 receiving end/sending ends send, and decompose a plurality of data flow that receive.Channel estimating and channel quality calculator 102
1, 102
2..., 102
MEstimate channel that pairing data flow experiences respectively, and calculate corresponding channel quality.Channel estimating and channel quality calculator 102
1, 102
2..., 102
MExport the channel quality indication of being calculated respectively.Channel quality indication (CQI) information arrangement machine 103
1According to first kind of possible pattern of rows and columns the output sequence of all M channel estimating and channel quality calculator is arranged.Channel quality indication (CQI) information arrangement machine 103
2According to second kind of possible pattern of rows and columns the output sequence of all M channel estimating and channel quality calculator is arranged, and the like, up to channel quality indication (CQI) information arrangement machine 103
N
Channel quality indication (CQI) information compressor reducer 104
1To channel quality indication (CQI) information arrangement machine 103
1Output sequence carry out conversion such as discrete cosine transform, then the output sequence through conversion is compressed; Similarly, the channel quality indication (CQI) information compressor reducer 104
2To channel quality indication (CQI) information arrangement machine 103
2Output sequence carry out conversion, compress then, and the like.Channel quality indication (CQI) information compressor reducer 104
1, 104
2..., 104
NTo offer channel quality indication (CQI) information pattern of rows and columns selector 105 through the result after conversion and the compression.105 pairs of all channel quality indication (CQI) information compressor reducers 104 of channel quality indication (CQI) information pattern of rows and columns selector
1, 104
2..., 104
NThe result of output compares.Select the optimal alignment pattern according to front method as shown in Figure 8, export the sequence number of optimal alignment pattern and the result of feedback information compression, and the feedback information of this sequence number and compression is offered feedback information constructor 106.Feedback information constructor 106 is constructed feedback information according to front mode as shown in Figure 9, and exports the feedback information that is constituted, and makes feedback information feed back to transmitting terminal by based on feedback link.
According to method of the present invention, in conjunction with the characteristics of channel quality indication (CQI) information compression algorithm,, adjust the arrangement mode of channel quality information adaptively, thereby reduced needed feedback information volume according to the time-varying characteristics of channel.
Along with the continuous variation of channel condition and system parameters, it obviously is irrational adopting certain particular feedback method regularly.And adopt method proposed by the invention, can under the condition that channel constantly changes, reduce the load of based on feedback link.Simultaneously, because transmitting terminal and receiving terminal have been arranged the constructive method of feedback method and feedback information in advance, so transmitting terminal does not need unnecessary control information to regulate the feedback model of receiving terminal.Therefore, adopt method of the present invention also can under the channel condition that changes, reduce the expense of the control information that transmitting terminal transmitted.
Figure 11 a to 11h, and table 2 provided some The simulation experiment result, to confirm validity of the present invention.
In emulation, adopt 3GPP TR 25.814 (referring to Physical layer aspects for evolveduniversal terrestrial radio access (UTRA) V7.1.0,2006-09) in given SCM-A channel model.The major parameter of communication system is as follows: transmitting terminal and receiving terminal respectively have 4 antennas, adopt the method for precoding based on the channel matrix singular value decomposition to transmit two data flow simultaneously, and total bandwidth is 10 megahertzes, and the frequency granularity of feedback is set at 180 KHz; When feedback information compresses, adopt discrete cosine transform that the channel quality indicator sequence is carried out conversion, the method for compression is to keep under the prerequisite of 85% original series energy, abandons feedback factor after the less conversion of energy.
In Figure 11 a to 11h, provided in twice separate channel realization the feedback information sequence of pairing original feedback information sequence of different feedback methods and transmitting terminal reconstruct respectively.In the analogous diagram shown in Figure 11 a and the 11b, the solid line bar is represented original channel quality indicator sequence, and dashed bars is illustrated in the feedback sequence of transmitting terminal reconstruct; In the analogous diagram shown in Figure 11 c and the 11d, solid line bar in two curves in top is represented the original channel quality indicator sequence of data flow 1, dashed bars is represented the feedback sequence in transmitting terminal reconstruct of data flow 1, solid line bar in following two curves is represented the original channel quality indicator sequence of data flow 2, and dashed bars is represented the feedback sequence in transmitting terminal reconstruct of data flow 2.Consistent among lines implication among Figure 11 e and the 11f and Figure 11 a and the 11b; Consistent among lines implication among Figure 11 g and the 11h and Figure 11 c and the 11d.
In Figure 11 c, adopt the method for the feedback information that connects two data flow; In Figure 11 d, adopt the pattern of rows and columns shown in the square frame 803 among Fig. 8.
Equally, in Figure 11 g, adopt the method for the feedback information that connects two data flow; In Figure 11 h, adopt the pattern of rows and columns shown in the square frame 803 among Fig. 8.
As can be seen, the channel quality indication (CQI) information sequence of reconstruct can characterize the feedback information before the compression to a certain extent, is noted that and has introduced fractional error inevitably in compression process from Figure 11 a to 11h.Following table 2 has provided the number of the needed feedback factor of different feedback systems.
Table 2
The selecteed arrangement mode of the underlined numeral of black matrix in the table 2 with less feedback load.
Table 2 explanation by selecting suitable pattern of rows and columns (numeral that underscore marks is the number of the required feedback factor of selected pattern of rows and columns), can reduce 1 with required feedback factor number.In this example, only used two kinds of possible pattern of rows and columns, i.e. N=2 is so need pattern of rows and columns indication of 1 bit.By increasing by 1 bit arrangement pattern indication information, can reduce by 1 feedback factor at least.Generally speaking, a feedback factor need be represented (referring to 3GPPR1-062954.LG Electronics. " Analysis on DCT based CQI reportingScheme ") with 5 bits.So method of the present invention can be adjusted feedback method according to the variation of channel condition, reaches the purpose that reduces feedback load.
According to the present invention, in feedback information, comprise feedback information after the quantification and two parts of pattern of rows and columns indication of feedback information sequence.Transmitting terminal is indicated based on pattern of rows and columns, and the channel quality information that receives is carried out demodulation, and finishes scheduling or operations such as adaptive coding and modulation.Under the channel condition that changes, technical scheme of the present invention can reduce feedback load effectively.
So far invention has been described in conjunction with the preferred embodiments.Should be appreciated that those skilled in the art can carry out various other change, replacement and interpolations under the situation that does not break away from the spirit and scope of the present invention.Therefore, scope of the present invention is not limited to above-mentioned specific embodiment, and should be limited by claims.
Claims (16)
1. method that reduces the feedback information volume in the multi-data stream transmission system comprises step:
Receive and decompose the reference signal of a plurality of data flow that transmitting terminal sends, calculate a plurality of data flow corresponding channel quality respectively, and the corresponding a plurality of channel quality indication (CQI) informations of channel quantity that experienced of generation and a plurality of data flow;
According to predetermined at least a pattern of rows and columns a plurality of channel quality indication (CQI) informations that produced are arranged, produced the channel quality indication (CQI) information sequence;
The channel quality indication (CQI) information sequence that is produced is carried out conversion, then the sequence through conversion is compressed;
From optimal alignment sequence through selection predetermined quantity the channel quality indication (CQI) information sequence of described conversion and compression, produce the result of the compression of pattern of rows and columns indication information of pattern of rows and columns of the selected optimal alignment sequence of indication and selected channel quality indication (CQI) information sequence, constitute feedback information by the optimal alignment sequence of described pattern of rows and columns indication information and compression.
2. method according to claim 1, wherein the step that described channel quality indication (CQI) information sequence is carried out conversion is that described channel quality indication (CQI) information sequence is carried out discrete cosine transform.
3. method according to claim 1, wherein the step that described channel quality indication (CQI) information sequence is carried out conversion is that described channel quality indication (CQI) information sequence is carried out the Hadamard conversion, or fractal transformation, or the motion compensation encoding of being correlated with based on interframe carries out conversion.
4. method according to claim 1, wherein the step of the optimal alignment pattern of predetermined quantity further comprises the step that the channel quality indication (CQI) information sequence through described conversion and compression is compared.
5. method according to claim 1, wherein said predetermined at least a pattern of rows and columns is earlier the element of the channel quality indication (CQI) information sequence of different data streams on the different frequency subchannel to be broken, individual element with original series is a base unit, recombinate, obtain the sequence after the new arrangement, sequence length after wherein arranging equates with the length sum of the channel quality indication (CQI) information sequence of arranging preceding all data flow, the adjacent element of the sequence after the arrangement can belong to different data streams, also can belong to same data flow.
6. method according to claim 1, wherein said predetermined at least a pattern of rows and columns is earlier the element of the channel quality indication (CQI) information sequence of different data streams on the different frequency subchannel to be broken, individual element with original series is a base unit, recombinate, obtain the sequence after the new arrangement, to the new sequence that obtains, adopt predetermined pattern to carry out the deletion of element or carry out the interpolation of element, make the length of the length of the new sequence that obtains and original series unequal, the adjacent element of the sequence after the arrangement can belong to different data streams, also can belong to same data flow.
7. according to claim 5 or 6 described methods, wherein said predetermined at least a pattern of rows and columns is that different data streams corresponding channel quality indication information sequence is carried out connecting sequentially.
8. according to claim 5 or 6 described methods, wherein said predetermined at least a pattern of rows and columns is that different data streams corresponding channel quality indication information sequence is staggered, when being staggered, be unit with the individual element of original channel quality indication (CQI) information sequence.
9. according to claim 5 or 6 described methods, wherein said predetermined at least a pattern of rows and columns is that different data streams corresponding channel quality indication information sequence is staggered, when being staggered, be unit with a plurality of elements of original channel quality indication (CQI) information sequence.
10. method that reduces the feedback information volume in the multi-data stream transmission system comprises step:
Receiving terminal receives the reference signal of a plurality of data flow, by reference signal the channel conditions between transmitting terminal and the receiving terminal is estimated, and is calculated the channel quality indication (CQI) information of a plurality of data flow on different frequency range;
According at least a predetermined arrangement pattern the channel quality indication (CQI) information of described a plurality of data flow is arranged, to produce the channel quality indication (CQI) information sequence;
The channel quality indication (CQI) information sequence that produces is carried out conversion, and the sequence through conversion is compressed;
From the optimal alignment sequence of channel quality indication (CQI) information sequence selection predetermined quantity of compression, produce pattern of rows and columns indication information of pattern of rows and columns of the selected optimal alignment sequence of indication;
Optimal alignment sequence and described pattern of rows and columns indication information of compressed described predetermined quantity are constituted feedback information.
11. method according to claim 10 further comprises feedback information is fed back to transmitting terminal, transmitting terminal selects one or more suitable receiving terminal to carry out the step of transfer of data from a plurality of receiving terminals according to the feedback information of being received.
12. method according to claim 10, wherein the step that described channel quality indication (CQI) information sequence is carried out conversion is that described channel quality indication (CQI) information sequence is carried out discrete cosine transform.
13. method according to claim 10, wherein the energy of a part of element in the channel quality indication (CQI) information sequence after the conversion is less, and the energy of another part element is bigger.
14. a device that reduces the feedback information volume in the multi-data stream transmission system comprises:
Channel estimating and channel quality computing unit, be used for the reference signal of a plurality of data flow of receiving is carried out channel estimating, calculate a plurality of data flow corresponding channel quality respectively, and the corresponding a plurality of channel quality indication (CQI) informations of channel quantity that experienced of generation and a plurality of data flow;
The channel quality indication (CQI) information arrangement units is used for according to predetermined at least a pattern of rows and columns a plurality of channel quality indication (CQI) informations that produced being arranged, and produces the channel quality indication (CQI) information sequence;
The channel quality indication (CQI) information compression unit is used for the channel quality indication (CQI) information sequence that is produced is carried out conversion, then the sequence through conversion is compressed;
Channel quality indication (CQI) information pattern of rows and columns selected cell, be used for from selecting the optimal alignment sequence of predetermined quantity through the channel quality indication (CQI) information sequence of described conversion and compression, the result of pattern of rows and columns indication information of pattern of rows and columns of the selected optimal alignment sequence of generation indication and the compression of selected channel quality indication (CQI) information sequence; With
The feedback information constructor is used for the optimal alignment sequence of pattern of rows and columns indication information and compression is constituted feedback information.
15. device according to claim 14, wherein the conversion that described channel quality indication (CQI) information sequence is carried out is discrete cosine transform.
16. a method that reduces the feedback information volume in the multi-data stream transmission system comprises step:
Receiving terminal receives the reference signal of a plurality of data flow, calculates the channel quality indication (CQI) information of the channel of a plurality of data flow of transmission;
According at least a predetermined arrangement pattern the channel quality indication (CQI) information of described a plurality of data flow is arranged, to produce the channel quality indication (CQI) information sequence;
The channel quality indication (CQI) information sequence of arranging is carried out conversion and compression;
From the optimal alignment sequence of channel quality indication (CQI) information sequence selection predetermined quantity of compression, and produce pattern of rows and columns indication information of pattern of rows and columns of the selected optimal alignment sequence of indication;
Optimal alignment sequence and the described pattern of rows and columns indication information selected are constituted feedback information.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101741506A (en) * | 2008-11-14 | 2010-06-16 | 中兴通讯股份有限公司 | Multi-carrier-based method and device for feeding back channel quality indicator |
| CN102036394A (en) * | 2009-09-29 | 2011-04-27 | 大唐移动通信设备有限公司 | Method for transmitting channel quality information and system |
| WO2011153691A1 (en) * | 2010-06-09 | 2011-12-15 | 富士通株式会社 | Method, mobile station, base station, and wireless communication system for feeding back channel quality signals |
| CN103907389A (en) * | 2011-11-04 | 2014-07-02 | 英特尔公司 | Link adaptation in coordinated multipoint system |
| CN107534545A (en) * | 2015-04-10 | 2018-01-02 | 摩托罗拉移动有限责任公司 | Method and apparatus for receiving control signaling |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101741506A (en) * | 2008-11-14 | 2010-06-16 | 中兴通讯股份有限公司 | Multi-carrier-based method and device for feeding back channel quality indicator |
| CN102036394A (en) * | 2009-09-29 | 2011-04-27 | 大唐移动通信设备有限公司 | Method for transmitting channel quality information and system |
| CN102036394B (en) * | 2009-09-29 | 2013-11-20 | 电信科学技术研究院 | Method for transmitting channel quality information and system |
| WO2011153691A1 (en) * | 2010-06-09 | 2011-12-15 | 富士通株式会社 | Method, mobile station, base station, and wireless communication system for feeding back channel quality signals |
| CN102771075A (en) * | 2010-06-09 | 2012-11-07 | 富士通株式会社 | Method, mobile station, base station, and wireless communication system for feeding back channel quality signals |
| CN103907389A (en) * | 2011-11-04 | 2014-07-02 | 英特尔公司 | Link adaptation in coordinated multipoint system |
| CN107534545A (en) * | 2015-04-10 | 2018-01-02 | 摩托罗拉移动有限责任公司 | Method and apparatus for receiving control signaling |
| CN107534545B (en) * | 2015-04-10 | 2021-05-28 | 摩托罗拉移动有限责任公司 | Method and apparatus for receiving control signaling |
| CN110574320A (en) * | 2017-05-02 | 2019-12-13 | 华为技术有限公司 | HARQ feedback method for eMTC and terminal equipment |
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