CN102111885A - Method and device for determining and adjusting encoded mode - Google Patents

Abstract

The invention discloses a method for determining and adjusting encoded mode, aiming to improve the accuracy degree for determining and adjusting encoded mode. The method comprises the following steps: a base station distributes PRB (Physical Resource Block) for UE (User Equipment) on a plurality of sub-bands according to the CQI (Channel Quality Indicator) information of the plurality of sub-bands reported by the UE; and after fitting the CQI information of the plurality of sub-bands or the related information corresponding to the CQI information of the plurality of sub-bands, the base station determines and adjusts an MCS (Modulation and Coding Scheme) for the distributed PRB according to the fitting result. The invention further discloses a device for realizing the method.

Description

A kind of method of definite adjustment coded system and device

Technical field

The present invention relates to the communications field, particularly relate to method and the device of determining to adjust coded system.

Background technology

Channel quality information (Channel Quality Indicator, CQI) be the major parameter that system dispatches, can reflect current quality of channel situation by the CQI value, this value is fed back to subscriber equipment (UserEquipment, UE) or (Base Station BS) can be used for aspects such as the scheduling of frequency domain selectivity, Adaptive Modulation, coding in the base station.For can the up signaling consumption of active balance and link circuit self-adapting/scheduling performance, consider variable channel condition and scheduling type simultaneously, CQI reports in time domain and frequency domain all certain intervals.The time interval that reports of CQI is unit with the subframe, the representative of each CQI value be channel quality on its frequency domain the preceding paragraph bandwidth range, the frequency domain bandwidth of CQI correspondence is the integral multiple of least resource piece bandwidth.Reporting of descending CQI comprises the multiple pattern that reports in the LTE system, and subband CQI reports with broadband CQI and reports.Wherein subband CQI reports in the pattern, subscriber equipment need report a plurality of subband CQI value sets, subband CQI is corresponding one section continuous frequency domain resource on frequency domain, it is with Resource Block (RB, Resource Block) be basic allocation unit, the subband size is the system parameters of the normalized definition relevant with system bandwidth.

Because it is one section continuous frequency domain resource that subband CQI reports what require each subband CQI correspondence, and it is not necessarily continuous in the shared resource of frequency domain concerning current scheduling user, possibility corresponding a plurality of subbands (promptly can't correspond to a subband), at this time according to the current subband CQI that the reports direct channel quality information of the shared resource of effecting reaction user just, thereby cause and to carry out effective link circuit self-adapting to the user.As mistake! Do not find Reference source.Shown in, the shared frequency domain resource of active user is to be dispersed among subband CQI1 and the subband CQI2, at this time the channel quality information of the shared resource of user just can't be determined to obtain according to which the CQI value that reports in the base station, and then can't determine to adjust coded system (Modulation andCoding Scheme, MCS).The possible implementation in base station is to recomputate the CQI value according to uplink channel information, determine the CQI value of down channel again according to the reciprocity of channel, but in Frequency Division Duplexing (FDD) (FDD) system, the characteristic of up-downgoing channel is different, therefore the CQI value that obtains is inaccurate, and then has influenced the accuracy of the MCS that selects.And this mode that recomputates the CQI value has increased the complexity that realizes.

Summary of the invention

The embodiment of the invention provides a kind of method and device of definite adjustment coded system, is used to improve the accuracy of definite adjustment coded system and reduces the complexity that realizes.

A kind of method of definite adjustment coded system may further comprise the steps:

Physical Resource Block PRB distributed for UE according to a plurality of subband CQI information that UE reports in the base station on a plurality of subbands;

Match is carried out to the relevant information of a plurality of subband CQI information or a plurality of subband CQI information correspondences in the base station, and determines to adjust coded system MCS according to fitting result for the PRB that distributes.

A kind of base station comprises:

Resource distribution module, a plurality of subband CQI information that are used for reporting according to UE are distributed Physical Resource Block PRB for UE on a plurality of subbands;

MCS selects module, is used for the base station relevant information of a plurality of subband CQI information or a plurality of subband CQI information correspondences is carried out match, and determine to adjust coded system MCS according to fitting result for the PRB that distributes.

The embodiment of the invention is carried out match to the relevant information of subband CQI, and determines MCS according to fitting result, has both realized determining more accurately MCS, need not the base station again and recomputates CQI, has simplified the complexity that realizes.

Description of drawings

Figure 1A is the schematic diagram of subband CQI and PRB in the prior art;

Figure 1B is a main method flow chart of determining MCS in the embodiment of the invention;

Fig. 2 in the embodiment of the invention to SNR carry out match obtain equivalent SNR and and then the method flow diagram of definite MCS;

Fig. 3 obtains obtaining equivalent SNR again behind the equivalent channel capacity for SNR being carried out match in the embodiment of the invention, and and then the method flow diagram of definite MCS;

Fig. 4 in the embodiment of the invention to the code efficiency value carry out match obtain average code efficiency value and and then the method flow diagram of definite MCS;

Fig. 5 is the mapping graph of CQI to MCS in the embodiment of the invention;

Fig. 6 is the mapping of MCS and code efficiency in the embodiment of the invention

Fig. 7 in the embodiment of the invention to MCS index carry out match obtain average MCS index and and then the method flow diagram of definite MCS;

Fig. 8 is the structure chart of base station in the embodiment of the invention;

Fig. 9-Figure 21 is simulated effect figure in the embodiment of the invention.

Embodiment

The embodiment of the invention is carried out match to the relevant information of subband CQI, and determines MCS according to fitting result, has both realized determining more accurately MCS, need not the base station again and recomputates CQI, has simplified the complexity that realizes.

Referring to Figure 1B, determine in the present embodiment that the main method flow process of MCS is as follows:

Step 101: Physical Resource Block (PRB) distributed for UE according to a plurality of subband CQI information that UE reports in the base station on a plurality of subbands.

Step 102: match is carried out to the relevant information of a plurality of subband CQI information or a plurality of subband CQI information correspondences in the base station, and determines MCS according to fitting result for the PRB that distributes.

The relevant information of subband CQI information correspondence has multiple, as signal to noise ratio (Signal Noise Ratio, SNR), code efficiency value (efficiency) or MCS index value (MCS index) etc., the process of therefore carrying out match is also slightly different, introduces implementation procedure in detail below by four embodiment.

Referring to Fig. 2, in the present embodiment to SNR carry out match obtain equivalent SNR and and then the method flow of definite MCS as follows:

Step 201: the base station obtains a plurality of subband CQI information that UE calculates according to descending channel information (information that can represent subband CQI value as CQI index value etc.).The basic process that UE calculates subband CQI information comprises: UE is according to down public guide frequency (Common Reference Signal, CRS) by measuring down link equivalence SNR, equivalent SNR is merged and is quantized into the CQI index value (CQIindex) of 4bit then, at last according to reporting pattern that 4 bit CQI index are fed back to the base station by ascending control channel or Uplink Shared Channel.

Step 202: the base station is that UE distributes PRB quantity and position.Concrete, the factor that the CQI index that feed back according to UE the base station is relevant with scheduling with other, as: it is that this UE selects PRB quantity and suitable PRB resource location that type of service, priority, data volume wait.

When a plurality of subband of the PRB of base station assigns correspondence, continue step 203, otherwise adopt prior art to select MCS.

Step 203: corresponding a plurality of SNR are determined according to a plurality of CQI index in the base station.Wherein, the base station prestores the corresponding relation of CQI index and SNR, and perhaps the base station can calculate SNR according to CQIindex by default algorithm.The inverse process that computational process adopts UE to calculate CQI index gets final product.

Step 204: the effective SINR mapping of index is adopted in the base station, and (Exponential Effective SINRMapping EESM), carries out match to a plurality of SNR, obtains equivalent signal-to-noise ratio.Concrete, ${\mathrm{SNR}}_{\mathrm{user}}=-\mathrm{\&beta;}\ln \left(\frac{e^{\frac{-{\mathrm{<figure-callout\; id="1"\; label="SNR"\; filenames="H2009102438471E00052.png"\; state="\{\{state\}\}">SNR</figure-callout>}}_1}{\mathrm{\&beta;}}}+e^{\frac{-{\mathrm{<figure-callout\; id="2"\; label="SNR"\; filenames="H2009102438471E00052.png,H2009102438471E00073.png"\; state="\{\{state\}\}">SNR</figure-callout>}}_2}{\mathrm{\&beta;}}}+...+e^{\frac{-{\mathrm{SNR}}_n}{\mathrm{\&beta;}}}}{n}\right);$ SNR wherein _UserThe expression equivalent signal-to-noise ratio, SNR _iThe signal to noise ratio of representing i CQI index correspondence, n represents the quantity of CQI index.Match can also be carried out to a plurality of SNR according to the quantity of the PRB that distributes in each subband in the base station.Be example for example with 2 CQI index, ${\mathrm{SNR}}_{\mathrm{user}}=-\mathrm{\&beta;}\ln \left(\frac{{\mathrm{<figure-callout\; id="1"\; label="N"\; filenames="H2009102438471E00052.png"\; state="\{\{state\}\}">N</figure-callout>}}_1\&CenterDot;e^{\frac{-{\mathrm{<figure-callout\; id="1"\; label="SNR"\; filenames="H2009102438471E00052.png"\; state="\{\{state\}\}">SNR</figure-callout>}}_1}{\mathrm{\&beta;}}}+{\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="H2009102438471E00052.png,H2009102438471E00073.png"\; state="\{\{state\}\}">N</figure-callout>}}_2\&CenterDot;e^{\frac{-{\mathrm{<figure-callout\; id="2"\; label="SNR"\; filenames="H2009102438471E00052.png,H2009102438471E00073.png"\; state="\{\{state\}\}">SNR</figure-callout>}}_2}{\mathrm{\&beta;}}}}{{\mathrm{<figure-callout\; id="1"\; label="N"\; filenames="H2009102438471E00052.png"\; state="\{\{state\}\}">N</figure-callout>}}_1+N_2}\right),$ N ₁The quantity of representing the PRB on first subband, N ₂The quantity of representing the PRB on second subband, β represents the verification factor preset, can obtain based on the least mean-square error to equivalent signal-to-noise ratio and desirable signal to noise ratio, be and MCS rank correlation correction value.Can simulate equivalent signal-to-noise ratio more accurately like this.

Step 205: the base station is determined MCS according to equivalent signal-to-noise ratio for the PRB that distributes.Wherein the base station has the span of equivalent signal-to-noise ratio and the corresponding relation of MCS index in advance, has determined that MCS index just is equivalent to determine MCS.

The base station also can obtain the equivalent channel capacity according to SNR earlier, and then obtains equivalent SNR.

Referring to Fig. 3, in the present embodiment SNR is carried out match and obtains obtaining equivalent SNR again behind the equivalent channel capacity, and and then the method flow of definite MCS as follows:

Step 301: the base station obtains a plurality of subband CQI information that UE calculates according to descending channel information (information that can represent subband CQI value as CQI index value etc.).

Step 302: the base station is that UE distributes PRB quantity and position.

When a plurality of subband of the PRB of base station assigns correspondence, continue step 303, otherwise adopt prior art to select MCS.

Step 303: corresponding a plurality of SNR are determined according to a plurality of CQI index in the base station.

Step 304: match is carried out to a plurality of SNR in the base station, obtains the equivalent channel capacity.Concrete, $C_{\mathrm{user}}=\frac{{\log }_2(1+{\mathrm{SNR}}_1)+{\log }_2(1+{\mathrm{SNR}}_2)+...+{\log }_2(1+{\mathrm{SNR}}_n)}{n};$ C wherein _UserExpression equivalent channel capacity, SNR _iRepresent the signal to noise ratio of i subband CQI information correspondence, n represents the quantity of subband CQI information.Match can also be carried out to a plurality of SNR according to the quantity of the PRB that distributes in each subband in the base station.Be example for example with 2 CQIindex, $C_{\mathrm{user}}=\frac{{\mathrm{<figure-callout\; id="1"\; label="N"\; filenames="H2009102438471E00052.png"\; state="\{\{state\}\}">N</figure-callout>}}_1\&CenterDot;{\log }_2(1+{\mathrm{SNR}}_1)+{{\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="H2009102438471E00052.png,H2009102438471E00073.png"\; state="\{\{state\}\}">N</figure-callout>}}_2\&CenterDot;\log }_2(1+{\mathrm{SNR}}_2)}{{\mathrm{<figure-callout\; id="1"\; label="N"\; filenames="H2009102438471E00052.png"\; state="\{\{state\}\}">N</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="H2009102438471E00052.png,H2009102438471E00073.png"\; state="\{\{state\}\}">N</figure-callout>}}_2},$ N ₁The quantity of representing the PRB on first subband, N ₂The quantity of representing the PRB on second subband.Can simulate equivalent channel capacity more accurately like this.

Step 305: equivalent signal-to-noise ratio is determined according to the equivalent channel capacity in the base station.Concrete, ${\mathrm{SNR}}_{\mathrm{user}}=2^{C_{\mathrm{user}}}-1$ 。

Step 306: the base station is determined MCS according to equivalent signal-to-noise ratio for the PRB that distributes.

Referring to Fig. 4, in the present embodiment to the code efficiency value carry out match obtain average code efficiency value and and then the method flow of definite MCS as follows:

Step 401: the base station obtains a plurality of subband CQI information that UE calculates according to descending channel information.

Step 402: the base station is that UE distributes PRB quantity and position.

When a plurality of subband of the PRB of base station assigns correspondence, continue step 403, otherwise adopt prior art to select MCS.

Step 403: corresponding a plurality of efficiency are determined according to a plurality of CQI index in the base station.Wherein, the base station prestores the corresponding relation of CQI index and efficiency, referring to shown in Figure 5.

Step 404: match is carried out to a plurality of efficiency in the base station, obtains average code efficiency value.Concrete, ${\mathrm{efficiency}}_{\mathrm{user}}=\frac{{\mathrm{<figure-callout\; id="1"\; label="efficiency"\; filenames="H2009102438471E00052.png"\; state="\{\{state\}\}">efficiency</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="efficiency"\; filenames="H2009102438471E00052.png,H2009102438471E00073.png"\; state="\{\{state\}\}">efficiency</figure-callout>}}_2+...+{\mathrm{efficiency}}_n}{n};$ Efficiency wherein _UserRepresent average code efficiency value, efficiency _iRepresent i CQI index corresponding codes efficiency value, n represents the quantity of CQI index.Match can also be carried out to a plurality of efficiency according to the quantity of the PRB that distributes in each subband in the base station.Be example for example with 2 CQI index, ${\mathrm{efficiency}}_{\mathrm{user}}=\frac{{\mathrm{<figure-callout\; id="1"\; label="efficiency"\; filenames="H2009102438471E00052.png"\; state="\{\{state\}\}">efficiency</figure-callout>}}_1\&CenterDot;{\mathrm{<figure-callout\; id="1"\; label="N"\; filenames="H2009102438471E00052.png"\; state="\{\{state\}\}">N</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="efficiency"\; filenames="H2009102438471E00052.png,H2009102438471E00073.png"\; state="\{\{state\}\}">efficiency</figure-callout>}}_2\&CenterDot;N_2}{{\mathrm{<figure-callout\; id="1"\; label="N"\; filenames="H2009102438471E00052.png"\; state="\{\{state\}\}">N</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="H2009102438471E00052.png,H2009102438471E00073.png"\; state="\{\{state\}\}">N</figure-callout>}}_2},$ N ₁The quantity of representing the PRB on first subband, N ₂The quantity of representing the PRB on second subband.Can simulate average more accurately code efficiency value like this.

Step 405: the base station is determined MCS according to average code efficiency value for the PRB that distributes.Wherein the base station has the corresponding relation of average code efficiency value and MCS index in advance, referring to shown in Figure 6, from table shown in Figure 6, determine the code efficiency value with the absolute value minimum of the difference of the average code efficiency value that calculates, and determine MCS index according to this code efficiency value.

Also can directly carry out match in the present embodiment to a plurality of CQI index, as obtain average CQI index, in table shown in Figure 5, determine the CQI index with the absolute value minimum of the difference of average CQI index then, and determine MCS index according to this CQI index.Because the corresponding relation of efficiency and MCS index with respect to the more refinement of corresponding relation of CQI index and MCS index, therefore determines that according to efficiency the result of MCS index is more accurate.

Referring to Fig. 7, in the present embodiment to MCS index carry out match obtain average MCS index and and then the method flow of definite MCS as follows:

Step 701: the base station obtains a plurality of subband CQI information that UE calculates according to descending channel information.

Step 702: the base station is that UE distributes PRB quantity and position.

When a plurality of subband of the PRB of base station assigns correspondence, continue step 703, otherwise adopt prior art to select MCS.

Step 703: corresponding a plurality of MCS index are determined according to a plurality of CQI index in the base station.Wherein, the base station prestores the corresponding relation of CQI index and MCS index, referring to shown in Figure 5.

Step 704: match is carried out to a plurality of MCS index in the base station, obtains average MCS index.Concrete,

Wherein

The expression round downwards or

Wherein

Expression rounds up; MCSindex _UserRepresent average MCS index, MCSindex _iThe MCSindex that represents i CQI index correspondence, n represent the quantity of CQI index.Match can also be carried out to a plurality of MCS index according to the quantity of the PRB that distributes in each subband in the base station.Be example for example with 2 CQI index,

Or

N ₁The quantity of representing the PRB on first subband, N ₂The quantity of representing the PRB on second subband.Can simulate average more accurately MCS index like this.

Step 705: the base station is determined MCS according to average MCS index for the PRB that distributes.

More than described the implementation procedure of definite MCS, this process mainly realizes that by the base station internal structure and the function to the base station is introduced below.

Referring to Fig. 8, the base station in the present embodiment comprises: resource distribution module 801 and MCS select module 802.

A plurality of subband CQI information that resource distribution module 801 is used for reporting according to UE are distributed Physical Resource Block PRB for UE on a plurality of subbands.

MCS selection module 802 is used for the base station relevant information of a plurality of subband CQI information correspondences is carried out match, and determines to adjust coded system MCS according to fitting result for the PRB that distributes.MCS selects module 802 to carry out match to the relevant information of a plurality of subband CQI information correspondences according to the quantity of the PRB that distributes in each subband.

MCS selects the signal to noise ratio of 802 pairs of a plurality of subband CQI information correspondences of module to carry out match, obtains equivalent signal-to-noise ratio, and determines MCS according to the corresponding relation of equivalent signal-to-noise ratio and signal to noise ratio and MCS for the PRB that distributes.That is, MCS selects module according to following formula the signal to noise ratio of a plurality of subband CQI information correspondences to be carried out match, obtains equivalent signal-to-noise ratio; Following formula is: ${\mathrm{SNR}}_{\mathrm{user}}=-\mathrm{\&beta;}\ln \left(\frac{e^{\frac{-{\mathrm{<figure-callout\; id="1"\; label="SNR"\; filenames="H2009102438471E00052.png"\; state="\{\{state\}\}">SNR</figure-callout>}}_1}{\mathrm{\&beta;}}}+e^{\frac{-{\mathrm{<figure-callout\; id="2"\; label="SNR"\; filenames="H2009102438471E00052.png,H2009102438471E00073.png"\; state="\{\{state\}\}">SNR</figure-callout>}}_2}{\mathrm{\&beta;}}}+...+e^{\frac{-{\mathrm{SNR}}_n}{\mathrm{\&beta;}}}}{n}\right);$ SNR wherein _UserThe expression equivalent signal-to-noise ratio, SNR _iRepresent the signal to noise ratio of i subband CQI information correspondence, n represents the quantity of subband CQI information.

Perhaps, MCS selects the signal to noise ratio of 802 pairs of a plurality of subband CQI information correspondences of module to carry out match, obtain the equivalent channel capacity, and determine equivalent signal-to-noise ratio, and determine MCS for the PRB that distributes according to the corresponding relation of equivalent signal-to-noise ratio and signal to noise ratio and MCS according to the equivalent channel capacity.That is, MCS selects module according to following formula the signal to noise ratio of a plurality of subband CQI information correspondences to be carried out match, obtains the equivalent channel capacity; Following formula is: $C_{\mathrm{user}}=\frac{{\log }_2(1+{\mathrm{SNR}}_1)+{\log }_2(1+{\mathrm{SNR}}_2)+...+{\log }_2(1+{\mathrm{SNR}}_n)}{n};$ C wherein _UserExpression equivalent channel capacity, SNR _iRepresent the signal to noise ratio of i subband CQI information correspondence, n represents the quantity of subband CQI information; And according to ${\mathrm{SNR}}_{\mathrm{user}}=2^{C_{\mathrm{user}}}-1$ Determine equivalent signal-to-noise ratio.

Perhaps, MCS selects 802 pairs of a plurality of subband CQI information corresponding codes efficient of module to carry out match, obtains average code efficiency, and determines MCS according to the corresponding relation of average code efficiency and average code efficiency and MCS for the PRB that distributes.

Perhaps, MCS selects the MCS index of 802 pairs of a plurality of subband CQI information correspondences of module to carry out match, obtains average MCS index, is equivalent to determine MCS for the PRB that distributes.

Be used to realize that the software of the embodiment of the invention can be stored in storage mediums such as floppy disk, hard disk, CD and flash memory.

The embodiment of the invention has been carried out the simulating, verifying assessment to 4 kinds of schemes, and simulation parameter is listed as follows:

Table 1, simulation parameter tabulation

Parameter	Numerical value
		System bandwidth	10M
Number of transmit antennas/reception antenna number	1/1
		Channel type	ETU5Hz
Channel estimating	Desirable

Subband CQI size

4PRB

The MCS index of four kinds of scheme selection and the difference between the desirable MCS index have wherein mainly been compared, the MCS index that selects as 0 expression is identical with the desirable MCS index that obtains, the MCS index that 1 expression is selected is bigger by 1 than the desirable MCS index that obtains, and the MCS index that-1 expression is selected is littler by 1 than the desirable MCS index that obtains.On behalf of different schemes, abscissa calculate the MCS index of acquisition and the distribution (MCS difference) of desirable MCS index difference among Fig. 9-Figure 21, and ordinate is represented the distribution probability (probability) of different differences.Among Fig. 9-Figure 21, the value of SNR from-6 to 30, granularity are 3, and this span has contained all possible value of SNR in the practical application substantially.From Fig. 9-Figure 21 as can be seen, the simulation result error is no more than 2, and the simulation curve of four kinds of schemes is located to overlap at 0 substantially substantially about 1, and when SNR is low, shows that the MCS index of selection is basic identical with the desirable MCS index that obtains, better effects if.

The embodiment of the invention is carried out match to the relevant information of subband CQI, and determine MCS according to fitting result, both realized determining more accurately MCS, need not the base station again and recomputate CQI, though the embodiment of the invention is carried out match to the relevant information of subband CQI, but this computational process will be simplified manyly with respect to the process that recomputates CQI, has therefore simplified the complexity that realizes.The embodiment of the invention provides multiple specific implementation, and proves that by simulation result these schemes are all feasible, and effect is better.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (15)

1. a method of determining to adjust coded system is characterized in that, may further comprise the steps:

Physical Resource Block PRB distributed for UE according to a plurality of subband CQI information that UE reports in the base station on a plurality of subbands;

Match is carried out to the relevant information of a plurality of subband CQI information or a plurality of subband CQI information correspondences in the base station, and determines to adjust coded system MCS according to fitting result for the PRB that distributes.

2. the method for claim 1 is characterized in that, the relevant information of subband CQI information correspondence comprises signal to noise ratio;

The base station is carried out match and determined that for the PRB that distributes the step of MCS comprises according to fitting result the relevant information of a plurality of subband CQI information correspondences: match is carried out to the signal to noise ratio of a plurality of subband CQI information correspondences in the base station, obtains equivalent signal-to-noise ratio; The base station is determined MCS according to the corresponding relation of equivalent signal-to-noise ratio and signal to noise ratio and MCS for the PRB that distributes.

3. method as claimed in claim 2, it is characterized in that, the base station is carried out the step that match obtains equivalent signal-to-noise ratio to the signal to noise ratio of a plurality of subband CQI information correspondences and comprised: the base station is carried out match according to following formula to the signal to noise ratio of a plurality of subband CQI information correspondences, obtains equivalent signal-to-noise ratio; Following formula is:

${\mathrm{SNR}}_{\mathrm{user}}=-\mathrm{\&beta;}\ln \left(\frac{e^{\frac{-\mathrm{SN}{R}_1}{\mathrm{\&beta;}}}+e^{\frac{-{\mathrm{SNR}}_2}{\mathrm{\&beta;}}}+...+e^{\frac{-\mathrm{SN}{R}_n}{\mathrm{\&beta;}}}}{n}\right);$ SNR wherein _UserThe expression equivalent signal-to-noise ratio, SNR _iRepresent the signal to noise ratio of i subband CQI information correspondence, n represents the quantity of subband CQI information.

4. the method for claim 1 is characterized in that, the relevant information of subband CQI information correspondence comprises signal to noise ratio;

The base station is carried out match and determined that for the PRB that distributes the step of MCS comprises according to fitting result the relevant information of a plurality of subband CQI information correspondences: match is carried out to the signal to noise ratio of a plurality of subband CQI information correspondences in the base station, obtains the equivalent channel capacity; Equivalent signal-to-noise ratio is determined according to the equivalent channel capacity in the base station; The base station is determined MCS according to the corresponding relation of equivalent signal-to-noise ratio and signal to noise ratio and MCS for the PRB that distributes.

5. method as claimed in claim 4, it is characterized in that, the base station is carried out the step that match obtains the equivalent channel capacity to the signal to noise ratio of a plurality of subband CQI information correspondences and comprised: the base station is carried out match according to following formula to the signal to noise ratio of a plurality of subband CQI information correspondences, obtains the equivalent channel capacity; Following formula is:

$C_{\mathrm{user}}=\frac{{\log }_2(1+{\mathrm{SNR}}_1)+{\log }_2(1+{\mathrm{SNR}}_2)+...+{\log }_2(1+{\mathrm{SNR}}_n)}{n};$ C wherein _UserExpression equivalent channel capacity, SNR _iRepresent the signal to noise ratio of i subband CQI information correspondence, n represents the quantity of subband CQI information;

The base station determines that according to the equivalent channel capacity step of equivalent signal-to-noise ratio comprises: the base station basis ${\mathrm{SNR}}_{\mathrm{user}}=2^{C_{\mathrm{user}}}-1$ Determine equivalent signal-to-noise ratio.

6. the method for claim 1 is characterized in that, the relevant information of subband CQI information correspondence comprises the code efficiency value;

The base station is carried out the step that match obtains the equivalent channel capacity to the relevant information of a plurality of subband CQI information correspondences and comprised: the base station is carried out match according to following formula to a plurality of subband CQI information corresponding codes efficiency values, obtains average code efficiency value; Following formula is:

${\mathrm{efficiency}}_{\mathrm{user}}=\frac{{\mathrm{efficiency}}_1+{\mathrm{efficiency}}_2+...+{\mathrm{efficiency}}_n}{n};$ Efficiency wherein _UserRepresent average code efficiency value, efficiency _iRepresent i CQI index corresponding codes efficiency value, n represents the quantity of CQI index.

7. method as claimed in claim 6 is characterized in that, the relevant information of subband CQI information correspondence comprises the MCS index value;

The base station is carried out the step that match obtains the equivalent channel capacity to the relevant information of a plurality of subband CQI information correspondences and comprised: the base station is carried out match according to following formula to the MCS index value of a plurality of subband CQI information correspondences, obtains average MCS index value; Following formula is:

Or

Wherein

Expression rounds downwards,

Expression rounds up; MCSindex _UserRepresent average MCS index, MCSindex _iThe MCS index that represents i CQI index correspondence, n represent the quantity of CQI index.

8. as each described method in the claim 1 to 7, it is characterized in that the step that match is carried out to the relevant information of a plurality of subband CQI information correspondences in the base station comprises: the base station is carried out match according to the quantity of the PRB that distributes in each subband to the relevant information of a plurality of subband CQI information correspondences.

9. a base station is characterized in that, comprising:

Resource distribution module, a plurality of subband CQI information that are used for reporting according to UE are distributed Physical Resource Block PRB for UE on a plurality of subbands;

MCS selects module, is used for the base station relevant information of a plurality of subband CQI information or a plurality of subband CQI information correspondences is carried out match, and determine to adjust coded system MCS according to fitting result for the PRB that distributes.

10. base station as claimed in claim 9 is characterized in that, the relevant information of subband CQI information correspondence comprises signal to noise ratio;

MCS selects module that the signal to noise ratio of a plurality of subband CQI information correspondences is carried out match, obtains equivalent signal-to-noise ratio, and determines MCS according to the corresponding relation of equivalent signal-to-noise ratio and signal to noise ratio and MCS for the PRB that distributes.

11. base station as claimed in claim 10 is characterized in that, MCS selects module according to following formula the signal to noise ratio of a plurality of subband CQI information correspondences to be carried out match, obtains equivalent signal-to-noise ratio; Following formula is:

${\mathrm{SNR}}_{\mathrm{user}}=-\mathrm{\&beta;}\ln \left(\frac{e^{\frac{-{\mathrm{SNR}}_1}{\mathrm{\&beta;}}}+e^{\frac{-{\mathrm{SNR}}_2}{\mathrm{\&beta;}}}+...+e^{\frac{-{\mathrm{SNR}}_n}{\mathrm{\&beta;}}}}{n}\right);$ SNR wherein _UserThe expression equivalent signal-to-noise ratio, SNR _iRepresent the signal to noise ratio of i subband CQI information correspondence, n represents the quantity of subband CQI information.

12. base station as claimed in claim 9 is characterized in that, the relevant information of subband CQI information correspondence comprises signal to noise ratio;

MCS selects module that the signal to noise ratio of a plurality of subband CQI information correspondences is carried out match, obtain the equivalent channel capacity, and determine equivalent signal-to-noise ratio, and determine MCS for the PRB that distributes according to the corresponding relation of equivalent signal-to-noise ratio and signal to noise ratio and MCS according to the equivalent channel capacity.

13. base station as claimed in claim 12 is characterized in that, MCS selects module according to following formula the signal to noise ratio of a plurality of subband CQI information correspondences to be carried out match, obtains the equivalent channel capacity; Following formula is: $C_{\mathrm{user}}=\frac{{\log }_2(1+{\mathrm{SNR}}_1)+{\log }_2(1+{\mathrm{SNR}}_2)+...+{\log }_2(1+{\mathrm{SNR}}_n)}{n};$ C wherein _UserExpression equivalent channel capacity, SNR _iRepresent the signal to noise ratio of i subband CQI information correspondence, n represents the quantity of subband CQI information; And according to ${\mathrm{SNR}}_{\mathrm{user}}=2^{C_{\mathrm{user}}}-1$ Determine equivalent signal-to-noise ratio.

14. base station as claimed in claim 9 is characterized in that, the relevant information of subband CQI information correspondence comprises code efficiency value or MCS index value.

15., it is characterized in that MCS selects module according to the quantity of the PRB that distributes in each subband the relevant information of a plurality of subband CQI information correspondences to be carried out match as each described base station in the claim 9 to 14.

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