CN101841356B - Method, device and system for feeding back channel quality information - Google Patents
Method, device and system for feeding back channel quality information Download PDFInfo
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Abstract
The invention discloses a method for feeding back channel quality information, which comprises the following steps of: firstly, determining a report collection of the channel quality information, and calculating comprehensive channel quality information of a plurality of cells according to channel state information of each cell in the collection; secondly, performing difference calculation on the comprehensive channel quality information of the plurality of cells; and finally, performing quantification on the comprehensive channel quality information of the plurality of cells after the difference calculation, and feeding the comprehensive channel quality information of the plurality of cells after the quantification back to a network side. So, in an LTE-A system adopting a joint transmission scheme, the network side can acquire accurate channel quality information of each cell to ensure that reasonable user scheduling, resource allocation and MCS selection can be performed according to the channel quality information of the plurality of cells, the throughput of the joint treatment of the plurality of cells can be further improved, and the system performance is promoted. The invention simultaneously discloses a communication device and a communication system.
Description
Technical field
The application relates to the communications field, particularly a kind of feedback method of channel quality information, Apparatus and system.
Background technology
(the International Telecommunication Union of International Telecommunications Union; ITU) for the performance of next generation mobile communication system IMT-Advanced system very harsh requirement has been proposed; For example; The maximum system transmission bandwidth need reach 100MHz, and the peak rate of up-downgoing transfer of data needs will reach 500Mbps and 1Gbps respectively; And system's average spectral efficiency (ase) especially edge spectrum efficiency proposed very high demand, for example,, require average spectral efficiency (ase)＞2.4bps/Hz to 22 systems of receiving, and cell edge spectrum efficiency＞0.07bps/Hz/ user.
In order to satisfy the performance requirement of IMT-Advanced system; 3GPP is at its mobile cellular communication Long Term Evolution (Long Term Evolution-Advanced of system of future generation; LTE-A) in the system, proposed to adopt the multi-point cooperative transmission technology to improve the method for systematic function.So-called multi-point cooperative transmission technology promptly is through the combined dispatching of a plurality of sub-districts of separating on the geographical position or collaborative transmission; Improve the user and receive quality of signals; Reduce the interference between the sub-district, thereby effectively improve the frequency spectrum service efficiency of power system capacity and edge customer.
Adopt the scheme of multi-point cooperative transmission technology mainly to be divided into two types: combined dispatching scheme and associating delivery plan below describe in detail.
The combined dispatching scheme is meant the coordination through the time between the cell base station, frequency and space resources, for the resource that different UE distributes mutually orthogonal, disturbs to avoid producing between the sub-district.The interference of minizone is the principal element of restriction cell edge UE performance, so combined dispatching can reduce the interference of minizone, thereby improves the performance of cell edge UE.For example; Consult shown in Figure 1; Data are sent to the UE that belongs to this sub-district respectively in base station in sub-district 1, sub-district 2 and the sub-district 3, and in this process, combined dispatching is to each other passed through in the base station in sub-district 1, sub-district 2 and the sub-district 3; Three UE that may the phase mutual interference are dispatched on the mutually orthogonal resource, thereby have effectively avoided the interference between the sub-district.
Have only a base station in the sub-district different to UE transmission data with the combined dispatching scheme, in the associating delivery plan, data can be sent to UE simultaneously in the base station in a plurality of sub-districts, receive quality of signals to strengthen UE.For example; Consult shown in Figure 2; Data are sent to a UE in base station in sub-district 1, sub-district 2 and the sub-district 3 on identical resource, UE receives the data from a plurality of sub-districts simultaneously, give UE if identical data are sent in the base station in all sub-districts; Then UE will just can promote the reception quality of signals of self from the useful signal stack of a plurality of sub-districts, thereby improve systematic function.
In the prior LTE system; UE needs regular public guide frequency port from the sub-district to receive common pilot signal; So that base station in the sub-district is assessed to the channel quality of this UE; And the channel quality indication (CQI) information that calculates (CQI) fed back to network side, index that can also comprise pre-coding matrix (PMI) and the number of data streams (RI) together fed back together with CQI.According to the difference of account form, the CQI of UE feedback is divided into two kinds of broadband CQI and subband CQI; Broadband CQI is the overall target of all frequency band upper signal channel quality of system, and subband CQI is the overall target of one section frequency band of system (frequency band of setting range) upper signal channel quality.According to the CQI of UE feedback, rational user's scheduling, resource allocation and modulating-coding speed can be carried out to this UE in the base station, and (Modulation and Coding Scheme, MCS) selection waits operation, thereby improves the availability of frequency spectrum.
In the LTE-A system, when adopting associating delivery plan, more than one to the sub-district of UE transmission data, therefore, require CQI that UE feeds back except the channel quality that will reflect the current home cell of UE, also should reflect the channel quality of other cooperation districts; In addition, the variation of wireless propagation environment and UE factor such as move and make that the power relatively of channel quality is changing constantly between the cooperation district, so, require the CQI of UE feedback also must can reflect this variation.But in the prior LTE system, UE only feeds back the CQI of current home cell; The technical scheme that is not fit to makes UE feed back the CQI of current home cell and cooperation district simultaneously; Obviously, the CQI feedback system under the LTE system can not satisfy the demand that user's scheduling in the associating delivery plan, resource allocation and MCS select under the LTE-A system; Hindered the enforcement of associating delivery plan in the LTE-A system; Therefore, need provide a kind of new CQI feedback method, make it be able to implement to satisfy the technical characterstic of associating delivery plan in the LTE-A system.
Summary of the invention
The application embodiment provides a kind of feedback method, Apparatus and system of channel quality information, make to adopt the LTE-A system of associating delivery plan, can obtain in the system each sub-district channel quality information accurately.
The concrete technical scheme that the application embodiment provides is following:
A kind of feedback method of channel quality information, wherein, a plurality of sub-districts adopt the associating send mode to send data to mobile station UE, and this method comprises:
Confirm that channel quality information reports set, and calculate many sub-districts comprehensive channel quality information according to the channel condition information of each sub-district in this set;
Said many sub-districts comprehensive channel quality information is carried out Difference Calculation;
Many sub-districts comprehensive channel quality information to through Difference Calculation quantizes.
A kind of communicator, a plurality of sub-districts adopt the associating send mode to send data to said communicator,, said communicator comprises:
Confirm the unit, be used for confirming that channel quality information reports set;
Measuring unit is used for measuring the channel condition information of each sub-district of said set;
First arithmetic element is used for calculating many sub-districts comprehensive channel quality information according to the channel condition information of said each sub-district;
Second arithmetic element is used for said many sub-districts comprehensive channel quality information is carried out Difference Calculation;
Quantize feedback unit, be used for the many sub-districts comprehensive channel quality information through Difference Calculation is quantized, and the many sub-districts comprehensive channel quality information feedback after quantizing is to network side.
A kind of communication system, a plurality of sub-districts adopt the associating send mode to send data to mobile station UE, and this system comprises:
UE is used for confirming that channel quality information reports set, calculates many sub-districts comprehensive channel quality information according to the channel condition information of each sub-district in this set, and said many sub-districts comprehensive channel quality information is carried out Difference Calculation; And to quantizing through many sub-districts comprehensive channel quality information of Difference Calculation, and the many sub-districts comprehensive channel quality information feedback after will quantizing is to network side;
The base station is used to receive the many sub-districts comprehensive channel quality information after the quantification of UE feedback, and according to this many sub-districts comprehensive channel quality information said UE is carried out user's scheduling and resource allocation.
In the embodiment of the invention, UE confirms that channel quality information reports set, and calculates many sub-districts comprehensive channel quality information according to the channel condition information of each sub-district in this set; Then, said many sub-districts comprehensive channel quality information is carried out Difference Calculation; At last, the many sub-districts comprehensive channel quality information through Difference Calculation is quantized, and the many sub-districts comprehensive channel quality information feedback after will quantizing is to network side.Like this; In the LTE-A system that adopts the associating delivery plan; Just can make network side obtain each sub-district channel quality information accurately; Select thereby can carry out rational user's scheduling, resource allocation and MCS, and then can improve the throughput that multi-plot joint is handled, elevator system performance according to multi-cell channel quality information.
Description of drawings
Fig. 1 is an associating scheduling scheme sketch map under the prior art;
Fig. 2 is an associating delivery plan sketch map under the prior art;
Fig. 3 is a communication system architectural framework sketch map among the application embodiment;
Fig. 4 is a base station functions structural representation among the application embodiment;
Fig. 5 is a UE feedback CQI flow chart among the application embodiment.
Embodiment
In the LTE-A system,, make network side can obtain each sub-district channel quality information accurately in order to satisfy the technical need that the associating delivery plan is implemented.Among the application embodiment, UE confirms that channel quality information reports set, and calculates many sub-districts comprehensive channel quality information according to the channel condition information of each sub-district in this set; Then, said many sub-districts comprehensive channel quality information is carried out Difference Calculation; At last, the many sub-districts comprehensive channel quality information through Difference Calculation is quantized, and the many sub-districts comprehensive channel quality information feedback after will quantizing is to network side.In the present embodiment, adopt Differential video coding method can reduce feedack amount, increase system efficiency.
Below in conjunction with accompanying drawing the application preferred embodiment is elaborated.
Consult shown in Figure 3ly, in the present embodiment, comprise a plurality of UE10 and a plurality of base station 11 in the communication system, wherein,
UE10 is used for confirming that channel quality information reports set, calculates many sub-districts comprehensive channel quality information according to the channel condition information of each sub-district in this set, and said many sub-districts comprehensive channel quality information is carried out Difference Calculation; And to quantizing through many sub-districts comprehensive channel quality information of Difference Calculation, and the many sub-districts comprehensive channel quality information feedback after will quantizing is to network side;
Base station 11 is used to receive the many sub-districts comprehensive channel quality information after the quantification of UE feedback, and according to this many sub-districts comprehensive channel quality information said UE is carried out user's scheduling and resource allocation.
Consult shown in Figure 4ly, in the present embodiment, UE10 comprises and confirms unit 100, measuring unit 101, first arithmetic element 102, second arithmetic element 103 and quantize feedback unit 104, wherein,
Confirm unit 100, be used for confirming that channel quality information reports set;
First arithmetic element 102 is used for calculating many sub-districts comprehensive channel quality information according to the channel condition information of said each sub-district;
Second arithmetic element 103 is used for said many sub-districts comprehensive channel quality information is carried out Difference Calculation;
Quantize feedback unit 104, be used for the many sub-districts comprehensive channel quality information through Difference Calculation is quantized, and the many sub-districts comprehensive channel quality information feedback after quantizing is to network side.
Based on the said system framework; In the present embodiment; With a UE10 and N base station 11 is that example describes; Set to participate in N the base station 11 of associating transmission, each base station 11 correspondence Serving cell (being designated hereinafter simply as the sub-district), and N sub-district be called sub-district 1,2...... sub-district, sub-district N respectively; So, consult shown in Figure 5ly, in the present embodiment, it is following that UE10 feedback is participated in the detailed process of each sub-district CQI of associating transmission:
Step 500: confirm that channel quality information reports set, below be called the C of collective, both comprised the sub-district of the current ownership of UE10 among the set C, also comprise the sub-district that other are collaborative.
In the present embodiment, the method that UE10 adopts when confirming set C includes but not limited to following two kinds:
1, the intensity of the pilot signal of each sub-district around UE10 measures; And detect each sub-district downstream signal (as; Synchronizing signal; The downlink business signal) time delay also feeds back to network side, and network side or/and the time delay of each cell synchronizing signal is finally confirmed set C, and will gather cells that C comprises to UE10 according to the mean value of each district pilots signal strength signal intensity in the setting-up time section.
2, UE10 or/and the time delay of each cell synchronizing signal is finally confirmed set C, and will gather cells that C comprises to network side according to the mean value of each district pilots signal strength signal intensity in the setting-up time section.
In the said method 1,2; According to the mean value of each district pilots signal strength signal intensity in the setting-up time section or/and the time delay of each cell synchronizing signal when finally confirming set C; Can adopt following qualifications: for example; The pilot signal strength of the pilot signal strength of each sub-district and the home cell of UE10 is poor＜3dB, or/and the downstream signal delay inequality＜2us)
In the practical application, set C is a set that becomes slowly, upgrade by certain cycle,
Step 510: the common pilot signal according to each sub-district among the set C calculates the channel condition information of each sub-district to UE10 respectively.
Step 520: according to the channel condition information of each sub-district to UE10; Calculate many sub-districts comprehensive channel quality information; Be designated as CQI (1) ... CQI (N), wherein, CQI calculates and can be based on the broadband; Also can be based on subband, by the concrete CQI computation schema of high-level signaling notice UE10 of base station 11.
In the practical application, UE10 calculate CQI (1) ... during CQI (N), operable method comprises but is limited to following two kinds:
First kind of account form is: make CQI (1) ... the channel quality information when transmit separately each sub-district of C in CQI (N) the expression set.For example, UE10 at first supposes to have only sub-district 1 to send data to UE10, and calculates the CQI of sub-district 1 according to formula 1, is designated as CQI (1); Then, UE10 supposition has only sub-district 2 to send data to UE10, and according to formula 1, calculate the CQI of sub-district 2, be designated as CQI (2); ... by that analogy, last UE10 supposition has only sub-district N to send data to UE10, and calculates the CQI of sub-district N according to formula 1, is designated as CQI (N); Wherein,
Formula 1 is:
H (k) is that (1≤k≤N) to the channel matrix of UE10, I0 is the interference from other sub-districts to sub-district k, and N0 is a noise; Formula 1 is merely for example.
Second kind of computational methods is:; Make CQI (1) ... each Serving cell is united the channel quality information of transmission in CQI (N) the expression set C according to setting means.For example, UE10 at first supposes to have only sub-district 1 to send data to UE10, and calculates CQI (1) according to formula 1; Then, data are sent to UE10 simultaneously with sub-district 2 in UE10 supposition sub-district 1, and according to the associating CQI of formula 2 calculation plots 1 and sub-district 2, are designated as CQI (2); ... the rest may be inferred, and last UE10 supposition sub-district 1,2... sub-district, sub-district N send data to UE10 simultaneously, and according to the associating CQI of formula 2 calculation plots 1,2... sub-district, sub-district N, be designated as CQI (N); Wherein,
Formula 2 is:
H (1), H (2) ... H (k) be sub-district 1, sub-district 2 ... sub-district k (1＜k≤N) divide the channel matrix that is clipped to UE10, I0 is the interference from other sub-districts, N0 is a noise; Formula 2 is merely for example.
Step 530: many sub-districts comprehensive channel quality information CQI (1) that step 320 calculate is obtained ... CQI (N) carries out Difference Calculation, obtain CQI ' (1) ... CQI ' is (N).
In the practical application, UE10 to CQI (1) ... when CQI (N) carries out Difference Calculation, comprise but be not limited to following two kinds of methods:
First method is: with sub-district 1 is reference point, adopt formula 3 or formula 4 calculate CQI ' (1) ... CQI ' (N), wherein,
Formula 3 is: CQI ' (1)=CQI (1)
CQI’(2)＝CQI(2)-CQI(1)
CQI’(3)＝CQI(3)-CQI(2)
CQI’(N)＝CQI(N)-CQI(N-1)
Formula 4 is: CQI ' (1)=CQI (1)
CQI’(2)＝CQI(2)-Quant(CQI(1))
CQI’(3)＝CQI(3)-Quant(CQI(2))
CQI’(N)＝CQI(N)-Quant(CQI(N-1))
Wherein Quant () is a quantization function;
Second method is: with sub-district m (1≤m≤N) is a reference point, adopts formula 5 or formula 6 to calculate CQI ' (1) ... CQI ' (N), the selection of reference point m can be by network side decision back notice UE10; Also can confirm back informing network side by UE10; Repeat no more at this, wherein
Formula 5 is: CQI ' (1)=CQI (1)-CQI (m)
CQI’(2)＝CQI(2)-CQI(m)
CQI’(m-1)＝CQI(m-1)-CQI(m)
CQI’(m)＝CQI(m)
CQI’(m+1)＝CQI(m+1)-CQI(m)
CQI’(N)＝CQI(N)-CQI(m)
Formula 6 is: CQI ' (1)=CQI (1)-Quant (CQI (m))
CQI’(2)＝CQI(2)-Quant(CQI(m))
CQI’(m-1)＝CQI(m-1)-Quant(CQI(m))
CQI’(m)＝CQI(m)
CQI’(m+1)＝CQI(m+1)-Quant(CQI(m))
CQI’(N)＝CQI(N)-Quant(CQI(m))
Wherein, Quant () is a quantization function;
Step 540: adopt the multi-cell channel quality information CQI ' (1) that obtains after 7 pairs of Difference Calculation of formula ... CQI ' (N) quantizes, and wherein, formula 7 is: QCQI ' (k)=Quant (CQI ' (k)), k=1 ..., N.
In practical application; Preferably; CQI ' (1) that CQI as a reference (1) or CQI (m) obtain after Difference Calculation or CQI ' (m) the L Bit data of available setting quantize, and remaining CQI ' () then uses the Q bit quantization, sets Q＜L usually; Parameter to as a reference adopts long L Bit data to quantize, and is in order to obtain quantized result more accurately.
Step 550: will quantize many sub-districts comprehensive channel quality information QCQI ' (1) that the back obtains ... QCQI ' (N) feeds back to network side; Network side can be received by base station 11; Also can receive by base station controller; Perhaps receive, repeat no more at this by other network elements with corresponding management function.
Based on the foregoing description; Base station 11 in each sub-district of network side receive many sub-districts comprehensive channel quality information QCQI ' (1) after the quantification of UE10 feedback ... QCQI ' (N) after; Can according to formula 8 or 9 couples of QCQI ' of formula (1) ... QCQI ' (N) carries out unfavourable balance and divides and calculate; With the estimated value ECQI (1) that obtains the multi-cell channel quality ... ECQI (N), wherein
Formula 8 is: ECQI (1)=QCQI ' (1)
ECQI(2)＝QCQI’(2)+ECQI(1)
ECQI(3)＝QCQI’(3)+ECQI(2)
ECQI(N)＝QCQI’(N)+ECQI(N-1)
ECQI(1)＝QCQI’(1)+ECQI(m)
ECQI(2)＝QCQI’(2)+ECQI(m)
ECQI(m-1)＝QCQI’(m-1)+ECQI(m)
ECQI(m+1)＝QCQI’(m+1)+ECQI(m)
ECQI(N)＝QCQI’(N)+ECQI(m)
Wherein, If UE10 according to first kind of account form in the step 520 obtain CQI (1) ... CQI (N); Then the ECQI (1) that recovers of the base station 11 of network side ... ECQI (N) representes the independent information quality information in each sub-district that set C comprises respectively; And if UE10 according to second kind of account form in the step 520 obtain CQI (1) ... CQI (N); Then the ECQI (1) that recovers of the base station 11 of network side ... ECQI (N) promptly represent respectively channel quality information, sub-district 1 and sub-district 2 associatings of sub-district 1 channel quality information ... Sub-district 1, sub-district 2 ... the channel quality information that close the sub-district, repeat no more at this.
In the step 520 of the foregoing description; If UE10 has adopted the closed loop precoding; Then UE10 calculate CQI (1) ... CQI (N) is before; Need to calculate pre-coding matrix earlier and to confirm its index value (PMI) in code book, calculate again CQI (1) ... CQI (N), if UE10 QCQI ' (1) behind feedback quantization ... QCQI ' is (N) time; The pre-coding matrix that employing calculates carries out precoding, then UE10 need with QCQI ' (1) ... QCQI ' (N) and the PMI that obtains together feed back to network side.
On the other hand, technology is sent data if UE10 uses wave beam forming, and the data during the UE10 actual transmissions are through weighting so, this can cause the signal to noise ratio of network side demodulation and the signal to noise ratio that calculates based on public guide frequency inequality; Take place for fear of this situation; The CQI (1) no matter UE10 calculates in step 520 ... the channel quality information when transmit separately each sub-district in the C is gathered in CQI (N) expression, and still the channel quality information of transmission is united in interior each sub-district of expression set C according to setting means; Network side all need according to the QCQI ' (1) of the final feedback of UE10 ... QCQI ' (N) recovers each sub-district that set C comprises ECQI (k) when transmitting separately; K=1; ..., N, and according to the figuration gain of each sub-district the ECQI (k) that recovers is compensated on this basis; The actual value of the channel quality information when obtaining each sub-district and transmitting separately, and the actual value of the channel quality information of each sub-district when carrying out joint transmission according to setting means.
In sum, among the application embodiment, UE confirms that channel quality information reports set, and calculates many sub-districts comprehensive channel quality information according to the channel condition information of each sub-district in this set; Then, said many sub-districts comprehensive channel quality information is carried out Difference Calculation; At last, the many sub-districts comprehensive channel quality information through Difference Calculation is quantized, and the many sub-districts comprehensive channel quality information feedback after will quantizing is to network side.Like this; In the LTE-A system that adopts the associating delivery plan; Just can make network side obtain each sub-district channel quality information accurately; Select thereby can carry out rational user's scheduling, resource allocation and MCS, and then can improve the throughput that multi-plot joint is handled, elevator system performance according to multi-cell channel quality information.
Obviously, those skilled in the art can in the basis please in embodiment carry out various changes and modification and the spirit and the scope that do not break away from the application.Like this, belong within the scope of the application's claim and equivalent technologies thereof if these among the application embodiment are revised with modification, then the embodiment among the application also is intended to comprise these changes and modification interior.
Claims (16)
1. the feedback method of a channel quality information is characterized in that, comprising:
Confirm that channel quality information reports set, and calculate many sub-districts comprehensive channel quality information according to the channel condition information of each sub-district in this set;
Said many sub-districts comprehensive channel quality information is carried out Difference Calculation;
Many sub-districts comprehensive channel quality information to through Difference Calculation quantizes;
With the many sub-districts comprehensive channel quality information feedback after quantizing to network side.
2. the method for claim 1 is characterized in that, confirms that channel quality information reports before the set, comprising:
Measure the time delay of pilot signal strength He each cell downlink signal of each sub-district, obtain measurement result;
Obtain said channel quality in this locality according to said measurement result and report set, perhaps, said measurement feedback to network side, and after network side obtains said channel quality according to said measurement result and reports set, is received the result that network side returns.
3. method as claimed in claim 2; It is characterized in that; Obtaining channel quality according to said measurement result reports set to comprise: with the mean value of pilot signal strength in the setting-up time section of each sub-district or/and the time delay of each cell downlink signal; Compare with pre-conditioned, and will meet said pre-conditioned sub-district ownership to said set.
4. the method for claim 1 is characterized in that, the channel quality information when said many sub-districts comprehensive channel quality information representes that transmit separately each sub-district in the said set; Perhaps, represent that each sub-district in the said set unites the channel quality information of transmission according to setting means.
5. method as claimed in claim 4; It is characterized in that; If said many sub-districts comprehensive channel quality information be expressed as CQI (1) ... CQI (N); Then to said CQI (1) ... when CQI (N) carries out Difference Calculation, adopt formula CQI ' (1)=CQI (1), CQI ' (2)=CQI (2)-CQI (1) ... CQI ' (N)=CQI (N)-CQI (N-1), perhaps; Adopt formula CQI ' (1)=CQI (1), CQI ' (2)=CQI (2)-Quant (CQI (1)) ... CQI ' (N)=CQI (N)-Quant (CQI (N-1)), wherein Quant () is a quantization function.
6. method as claimed in claim 4; It is characterized in that; If said many sub-districts comprehensive channel quality information be expressed as CQI (1) ... CQI (N); Then to said CQI (1) ... when CQI (N) carries out Difference Calculation; Adopt formula CQI ' (1)=CQI (1)-CQI (m) ... CQI ' (m-1)=CQI (m-1)-CQI (m), CQI ' (m)=CQI (m), CQI ' (m+1)=CQI (m+1)-CQI (m) ... CQI ' (N)=CQI (N)-CQI (m); Perhaps, adopt formula CQI ' (1)=CQI (1)-Quant (CQI (m)) ... CQI ' (m-1)=CQI (m-1)-Quant (CQI (m)), CQI ' (m)=CQI (m), CQI ' (m+1)=CQI (m+1)-Quant (CQI (m)), CQI ' (N)=CQI (N)-Quant (CQI (m)), Quant () is a quantization function; Wherein, m is selected reference point, 1≤m≤N.
7. like each described method of claim 1-6, it is characterized in that, after network side receives the many sub-districts comprehensive channel quality information after the said quantification of feedback, it is carried out unfavourable balance divide and calculate, to obtain the estimated value of said many sub-districts comprehensive channel quality information.
8. method as claimed in claim 7; It is characterized in that; Send data if adopt the wave beam forming technology; After then network side obtains the estimated value of said many sub-districts comprehensive channel quality information, according to the estimated value of this many sub-districts comprehensive channel quality information, the estimated value of the channel quality information when obtaining each sub-district that said set comprises and transmitting separately; And according to the figuration gain of each sub-district; The estimated value of the channel quality information when respectively said each sub-district being transmitted separately compensates, the actual value of the channel quality information when transmitting separately to obtain each sub-district that said set comprises, and the actual value of the comprehensive channel quality information when obtaining each sub-district and carrying out joint transmission according to setting means.
9. a communicator is characterized in that, said communicator comprises:
Confirm the unit, be used for confirming that channel quality information reports set;
Measuring unit is used for measuring the channel condition information of each sub-district of said set;
First arithmetic element is used for calculating many sub-districts comprehensive channel quality information according to the channel condition information of said each sub-district;
Second arithmetic element is used for said many sub-districts comprehensive channel quality information is carried out Difference Calculation;
Quantize feedback unit, be used for the many sub-districts comprehensive channel quality information through Difference Calculation is quantized, and the many sub-districts comprehensive channel quality information feedback after will quantizing is to network side.
10. communicator as claimed in claim 9 is characterized in that, said definite unit confirms that channel quality information reports before the set, measures the time delay of pilot signal strength He each cell downlink signal of each sub-district, obtains measurement result; And obtain said channel quality in this locality according to said measurement result and report set; Perhaps; Said measurement feedback to network side, and after network side obtains said channel quality according to said measurement result and reports set, is received the result that network side returns.
11. communicator as claimed in claim 9; It is characterized in that; It is fashionable that said definite unit obtains the channel quality report set according to said measurement result; The pilot signal strength of each sub-district mean value in the setting-up time section or/and the time delay of each cell downlink signal compares with pre-conditioned, and will be met said pre-conditioned sub-district ownership to said set.
12. a communication system is characterized in that, comprising:
UE is used for confirming that channel quality information reports set, calculates many sub-districts comprehensive channel quality information according to the channel condition information of each sub-district in this set, and said many sub-districts comprehensive channel quality information is carried out Difference Calculation; And to quantizing through many sub-districts comprehensive channel quality information of Difference Calculation, and the many sub-districts comprehensive channel quality information feedback after will quantizing is to network side;
The base station is used to receive the many sub-districts comprehensive channel quality information after the quantification of UE feedback, and according to this many sub-districts comprehensive channel quality information said UE is carried out user's scheduling and resource allocation.
13. communication system as claimed in claim 12 is characterized in that, said UE confirms that channel quality information reports before the set, measures the time delay of pilot signal strength He each cell downlink signal of each sub-district, obtains measurement result; Obtain said channel quality in this locality according to said measurement result and report set, perhaps, said measurement feedback to the base station, and after the base station obtains said channel quality according to said measurement result and reports set, is received the result that the base station is returned.
14. communication system as claimed in claim 13; It is characterized in that; Said UE or base station obtain channel quality according to said measurement result and report set to comprise: with the mean value of pilot signal strength in the setting-up time section of each sub-district or/and the time delay of each cell downlink signal; Compare with pre-conditioned, and will meet said pre-conditioned sub-district ownership to said set.
15. like claim 12,13 or 14 described communication systems; It is characterized in that; After said base station receives the many sub-districts comprehensive channel quality information after the said quantification of feedback; Before carrying out user's scheduling and resource allocation, said many sub-districts comprehensive channel quality information is carried out unfavourable balance divide calculating, to obtain the estimated value of said many sub-districts comprehensive channel quality information.
16. communication system as claimed in claim 15; It is characterized in that; Technology is sent data if said UE adopts wave beam forming; After then said base station network side obtains the estimated value of said many sub-districts comprehensive channel quality information, according to the estimated value of this many sub-districts comprehensive channel quality information, the estimated value of the channel quality information when obtaining each sub-district that said set comprises and transmitting separately; And according to the figuration gain of each sub-district; The estimated value of the channel quality information when respectively said each sub-district being transmitted separately compensates, the actual value of the channel quality information when transmitting separately to obtain each sub-district that said set comprises, and the actual value of the comprehensive channel quality information when obtaining each sub-district and carrying out joint transmission according to setting means.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200910080450 CN101841356B (en) | 2009-03-18 | 2009-03-18 | Method, device and system for feeding back channel quality information |
| PCT/CN2010/071119 WO2010105571A1 (en) | 2009-03-18 | 2010-03-18 | Method for instructing to measure and feed back channel quality information, device and system thereof |
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| CN 200910080450 CN101841356B (en) | 2009-03-18 | 2009-03-18 | Method, device and system for feeding back channel quality information |
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| US9813135B2 (en) | 2010-09-29 | 2017-11-07 | Qualcomm, Incorporated | Systems and methods for communication of channel state information |
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