CN101841356A - 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 at 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 by the combined dispatching of a plurality of sub-districts of separating on the geographical position or collaborative transmission, improve the quality of user's received signal, 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 classes: combined dispatching scheme and associating delivery plan below describe in detail.
The combined dispatching scheme is meant the coordination by 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, base station in sub-district 1, sub-district 2 and the sub-district 3 sends data to the UE that belongs to this sub-district respectively, in this process, combined dispatching is to each other passed through in 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, the base station in a plurality of sub-districts can send data to UE simultaneously, to strengthen the quality of UE received signal.For example, consult shown in Figure 2, base station in sub-district 1, sub-district 2 and the sub-district 3 sends data to a UE on identical resource, UE receives the data from a plurality of sub-districts simultaneously, if the base station in all sub-districts sends identical data to UE, then UE will just can promote the quality of the received signal 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 (CQI) that calculates 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 at 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 fit to does not make UE feed back the CQI of current home cell and cooperation district simultaneously, obviously, 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 to satisfy the technical characterstic of associating delivery plan in the LTE-A system, it is implemented.
Summary of the invention
The embodiment of the present application 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 embodiment of the present application provides is as follows:
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:
Determine 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;
Described many sub-districts comprehensive channel quality information is carried out Difference Calculation;
Many sub-districts comprehensive channel quality information through Difference Calculation is quantized.
A kind of communicator, a plurality of sub-districts adopt the associating send mode to send data to described communicator,, described communicator comprises:
Determining unit is used for determining that channel quality information reports set;
Measuring unit, the channel condition information of each sub-district in the described set;
First arithmetic element is used for calculating many sub-districts comprehensive channel quality information according to the channel condition information of described each sub-district;
Second arithmetic element is used for described 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 determining 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 described 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 described UE is carried out user's scheduling and resource allocation.
In the embodiment of the invention, UE determines 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, described 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, thereby can carry out rational user's scheduling, resource allocation and MCS according to multi-cell channel quality information selects, and then can improve the throughput that multi-plot joint is handled, elevator system performance.
Description of drawings
Fig. 1 is an associating scheduling scheme schematic diagram under the prior art;
Fig. 2 is an associating delivery plan schematic diagram under the prior art;
Fig. 3 is a communication system architectural framework schematic diagram in the embodiment of the present application;
Fig. 4 is a base station functions structural representation in the embodiment of the present application;
Fig. 5 is a UE feedback CQI flow chart in the embodiment of the present application.
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.In the embodiment of the present application, UE determines 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, described 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 determining 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 described 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 described UE is carried out user's scheduling and resource allocation.
Consult shown in Figure 4ly, in the present embodiment, UE10 comprises determining unit 100, measuring unit 101, first arithmetic element 102, second arithmetic element 103 and quantize feedback unit 104, wherein,
Determining unit 100 is used for determining 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 described each sub-district;
Second arithmetic element 103 is used for described 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 in N the base station 11 that participates in the associating transmission, each base station 11 corresponding Serving cells (being designated hereinafter simply as the sub-district), and N sub-district be called sub-district 1,2...... sub-district, sub-district N; So, consult shown in Figure 5ly, in the present embodiment, it is as follows that UE10 feedback participates in the detailed process of each sub-district CQI of associating transmission:
Step 500: determine that channel quality information reports set,, both comprised the sub-district of the current ownership of UE10 among the set C, also comprise the sub-district that other are collaborative hereinafter referred to as the C of collective.
In the present embodiment, the method that UE10 adopts when determining 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, network side or/and the time delay of each sub-district synchronizing signal is finally determined set C, and will gather cell notification 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 sub-district synchronizing signal is finally determined set C, and will gather cell notification 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 sub-district synchronizing signal when finally determining 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 calculating 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 only for giving an 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, UE10 supposition sub-district 1 and sub-district 2 send data to UE10 simultaneously, 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 only for giving an 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, including but 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 determine back informing network side by UE10, do not repeat them here, 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 actual applications, preferably, as with reference to the CQI (1) of point or the CQI ' (1) that after Difference Calculation, obtains of CQI (m) or CQI ' (m) the L Bit data of available setting quantize, remaining CQI ' () then uses the Q bit quantization, usually set Q＜L, to adopting long L Bit data to quantize, be in order to obtain quantized result more accurately as parameter with reference to point.
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, do not repeat them here 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)
Formula 9 is: (m)=QCQI ' (m) for ECQI
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 obtains CQI (1) according to first kind of account form in the step 520, ... CQI (N), the ECQI (1) that recovers of the base station 11 of network side then, ... ECQI (N) represents the independent information quality information in each sub-district that set C comprises respectively, and if UE10 obtains CQI (1) according to second kind of account form in the step 520, ... CQI (N), the ECQI (1) that recovers of the base station 11 of network side then, ... ECQI (N) promptly represents the channel quality information of sub-district 1 respectively, the channel quality information of sub-district 1 and sub-district 2 associatings, sub-district 1, sub-district 2, ... the channel quality information that close the sub-district does not repeat them here.
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 determine 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, if UE10 uses the wave beam forming technology to send data, 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, in the embodiment of the present application, UE determines 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, described 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, thereby can carry out rational user's scheduling, resource allocation and MCS according to multi-cell channel quality information selects, and then can improve the throughput that multi-plot joint is handled, elevator system performance.
Obviously, those skilled in the art can carry out various changes and modification and the spirit and scope that do not break away from the application to the embodiment among the application.Like this, if these in the embodiment of the present application are revised and modification belongs within the scope of the application's claim and equivalent technologies thereof, 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:
Determine 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;
Described many sub-districts comprehensive channel quality information is carried out Difference Calculation;
Many sub-districts comprehensive channel quality information through Difference Calculation is quantized;
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, determines 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 described channel quality in this locality according to described measurement result and report set, perhaps, described measurement feedback to network side, and after network side obtains described channel quality according to described 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 described 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 described pre-conditioned sub-district ownership to described set.
4. the method for claim 1 is characterized in that, the channel quality information when described many sub-districts comprehensive channel quality information represents that transmit separately each sub-district in the described set; Perhaps, represent that each sub-district in the described 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 described many sub-districts comprehensive channel quality information is expressed as CQI (1), ... CQI (N), then to described 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 described many sub-districts comprehensive channel quality information is expressed as CQI (1), ... CQI (N), then to described 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. as each described method of claim 1-6, it is characterized in that, after network side receives many sub-districts comprehensive channel quality information after the described quantification of feedback, it is carried out unfavourable balance divide and calculate, to obtain the estimated value of described many sub-districts comprehensive channel quality information.
8. method as claimed in claim 7, it is characterized in that, if adopt the wave beam forming technology to send data, after then network side obtains the estimated value of described many sub-districts comprehensive channel quality information, estimated value according to this many sub-districts comprehensive channel quality information, the estimated value of the channel quality information when obtaining each sub-district that described 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 described each sub-district being transmitted separately compensates, the actual value of the channel quality information when transmitting separately, and the actual value of the comprehensive channel quality information when obtaining each sub-district and carrying out joint transmission according to setting means to obtain each sub-district that described set comprises.
9. a communicator is characterized in that, described communicator comprises:
Determining unit is used for determining that channel quality information reports set;
Measuring unit, the channel condition information of each sub-district in the described set;
First arithmetic element is used for calculating many sub-districts comprehensive channel quality information according to the channel condition information of described each sub-district;
Second arithmetic element is used for described 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.
10. communicator as claimed in claim 9 is characterized in that, described determining unit determines 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 described channel quality in this locality according to described measurement result and report set, perhaps, described measurement feedback to network side, and after network side obtains described channel quality according to described 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 described determining unit obtains the channel quality report set according to described measurement result, 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 described pre-conditioned sub-district ownership to described set.
12. a communication system is characterized in that, comprising:
UE is used for determining 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 described 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 described UE is carried out user's scheduling and resource allocation.
13. communication system as claimed in claim 12 is characterized in that, described UE determines 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 described channel quality in this locality according to described measurement result and report set, perhaps, described measurement feedback to the base station, and after the base station obtains described channel quality according to described 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, described UE or base station obtain channel quality according to described 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 described pre-conditioned sub-district ownership to described set.
15. as claim 12,13 or 14 described communication systems, it is characterized in that, after described base station receives many sub-districts comprehensive channel quality information after the described quantification of feedback, before carrying out user's scheduling and resource allocation, described many sub-districts comprehensive channel quality information is carried out unfavourable balance divide calculating, to obtain the estimated value of described many sub-districts comprehensive channel quality information.
16. communication system as claimed in claim 15, it is characterized in that, if described UE adopts the wave beam forming technology to send data, after then described base station network side obtains the estimated value of described many sub-districts comprehensive channel quality information, estimated value according to this many sub-districts comprehensive channel quality information, the estimated value of the channel quality information when obtaining each sub-district that described 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 described each sub-district being transmitted separately compensates, the actual value of the channel quality information when transmitting separately, and the actual value of the comprehensive channel quality information when obtaining each sub-district and carrying out joint transmission according to setting means to obtain each sub-district that described set comprises.
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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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