CN104883742B - The channel quality estimation of wireless channel - Google Patents
The channel quality estimation of wireless channel Download PDFInfo
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- CN104883742B CN104883742B CN201510257116.8A CN201510257116A CN104883742B CN 104883742 B CN104883742 B CN 104883742B CN 201510257116 A CN201510257116 A CN 201510257116A CN 104883742 B CN104883742 B CN 104883742B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
Abstract
It is used for the present invention provides a kind of when the secondary communication device of such as user equipment is returned only to the channel quality indicator (CQI) of the subband of selection and broadband CQI, the method for the channel quality distribution map of the first communication device estimation channel of such as base station.By any two side frequency of the subband for selection, the estimation CQI including the intermediate frequency between described two side frequencies obtains the distribution map.After the CQI of described two side frequencies to be converted to corresponding linear CQI value, by subtracting offset from the average value of corresponding linear CQI value, the Linear Estimation CQI value of the intermediate frequency is determined.The offset is determined according to the frequency interval between described two side frequencies.Preferably, the offset and the frequency interval be linearly.Interpolation, preferably linear interpolation are used to obtain the linear CQI value of other frequencies.
Description
Technical field
The present invention relates to the channel quality estimation of the wireless communication in mobile communication system, wherein, communication device can profit
Distribute the frequency resource of wireless channel in the data transmission with the channel quality of estimation.
Background technology
In mobile communications, broadband wireless channel is typically frequency selectivity, in this way in certain parts of channel width
Deep fading (deep fade) can occur so that these parts are not preferentially in the data transmission.Therefore, in mobile communication system
The adaptability distribution of the frequency resource of the channel of data transmission is generally used in system.It performs the distribution requirement and knows channel matter
Amount.
As an example, Fig. 1 describes the channel quality letter that base station (BS) is received from user equipment (UE) in LTE system
Breath, wherein, BS performs frequency resource allocation using the information.BS sends reference signal by downlink channel to UE first.
Based on the reference signal received, UE estimates the frequency response 110 of the channel in bandwidth.In LTE system, channel width is divided
Portions of bandwidth is cut into, each portions of bandwidth has one or more subbands.Each subband is subdivided into resource block group (RBG), often
A resource block group has certain bandwidth.Based on frequency response 110, UE calculates the channel of each subband defined in LTE specification
Quality indicator (CQI).UE also calculates the broadband CQI 120 for representing the average CQI in channel width.UE by frequency with
The different uplink channel feedback channel quality information of downlink channel.In order to save the wireless money of uplink channel
Source, LTE specification provide to send the channel quality information of limited quantity to BS.UE only sends broadband CQI 120 and the subband of selection
The CQI 130a-d of 135a-d, wherein, each in the CQI 130a-d of the subband of selection is the one of a portions of bandwidth
Highest CQI in a or multiple subbands.BS needs the frequency based on limited channel quality information allocation of downlink channel to provide
Source.
Although as US20140098663 is instructed, a simple allocation strategy only uses the son of the selection of UE reports
Band, but BS can estimate that the CQI of all subbands is advantageously before frequency resource allocation.US20120327874 is carried
A kind of method for the CQI for estimating all subbands is gone out, has been accomplished by the following way：So that in a portions of bandwidth, retain
The CQI (for example, CQI 103b of 6 work song bands of No. 2 portions of bandwidth) of the subband selected wherein, and be remaining subband (No. 5 and
7 work song bands) CQI distribution broadband CQI 120 plus or minus certain surplus value.This method is assumed in portions of bandwidth not
The CQI of estimation in the subband of selection is flat.However, (for example, frequency shown in FIG. 1 is rung when there is big roll-off in CQI
Roll-offing 142) greatly in 110 is answered, this method leads to the big error between the CQI of the CQI and estimation measured.
This field needs one kind in BS using technology, all with the limited channel quality information estimation returned based on UE
The CQI of subband, while big problem of roll-offing can be mitigated.The CQI of the estimation of all subbands is to the adaptability of the frequency resource of channel
Distribution is useful.
Invention content
The present invention provides a kind of for distributing the method for the frequency resource of wireless channel, first communication device and second are led to
T unit communicates on the wireless channel, wherein, this method includes：Scheduled bandwidth in channel is estimated by first communication device
On channel quality distribution map.The distribution map is included in the channel quality indicator (CQI) at multiple frequencies.Bandwidth includes multiple
Portions of bandwidth, each portions of bandwidth include one or more subbands.Each subband has nominal frequency.The following frequency band of channel width
Marginal frequency and upper band edge frequency are boundary.
Included by first communication device estimation distribution map：The broadband CQI of channel and multiple choosings are received from secondary communication device
The CQI for the subband selected.Then the first part of distribution map is formed in the following manner：By the CQI of the subband of multiple selections and choosing
The nominal frequency for the subband selected is merged into distribution map；When the nominal frequency of the subband of selection does not include lower band edge frequency
When, to distribution map distribution for the broadband CQI of lower band edge frequency；And when selection subband nominal frequency include it is upper
During band edge frequency, to distribution map distribution for the broadband CQI of upper band edge frequency.Later, by for belonging to distribution
Each pair of two side frequencies of the first part of figure, including the first estimation for the intermediate frequency between two side frequencies
CQI forms the second part of distribution map.
First estimation CQI is determined by the first estimation subprocess, the first estimation subprocess includes：It first will be in distribution map
The each CQI obtained in first part is converted to corresponding linear CQI value.Indicate the first linear CQI value and the second linear CQI value
As two corresponding linear CQI values respectively for two side frequencies.By subtracting from the average value of the first and second CQI values
Offset is gone, determines the linear first estimation CQI value of intermediate frequency.Particularly, according between the frequency between two side frequencies
Every determining offset.Preferably, offset and frequency interval be linearly.Hereafter, by the way that the linear first estimation CQI value is turned
The first estimation CQI is changed to, the first estimation CQI can be obtained.
Estimation distribution map further comprises：By include be not the first or second part for belonging to distribution map any frequency
Target frequency the second estimation CQI, form the Part III of distribution map.Second estimation is determined by the second estimation subprocess
CQI, the second estimation subprocess include：Interpolation be subordinated to the first or second part of distribution map CQI conversion two or more
Multiple linear CQI values.Preferably, linear insert method is used to determine linear second estimation CQI value.By the way that linear second is estimated
CQI value is converted to the second estimation CQI, obtains the second estimation CQI.
Disclosed method can be implemented in the base station including wireless transceiver and one or more processors.
Shown by the embodiment of following article, other aspects of the present invention are disclosed.
Description of the drawings
Fig. 1 shows in LTE system BS from the example of the UE channel quality informations received.
Fig. 2 is described according to the embodiment of the present invention, and first communication device is by wireless channel to secondary communication device
Reference signal is sent, and secondary communication device returns to limited channel quality information to first communication device.
Fig. 3 is described estimates channel quality distribution map according to exemplified embodiment of the present invention by first communication device
The step of.
Fig. 4 illustrates the CQI of the frequency between the subband for two selections of estimation according to illustrative embodiment
Method, wherein, the subbands of two selections have their CQI that is reported in limited channel quality information.
Fig. 5 describes method based on shown in Fig. 4, the estimation of the linear CQI value of all frequencies in channel width
Channel quality distribution map.
Specific embodiment
The present invention relates to the sides due to the channel quality distribution map based on limited channel quality information estimation wireless channel
Method.
Before detailed description of the present invention details, illustrated that the hard of the method can be implemented on it by means of Fig. 2
Part is set, wherein, it is expected that first communication device 210 obtains limited channel quality information from secondary communication device 220.In movement
In communication system, first communication device 210 is typically BS, and secondary communication device 220 generally can be UE or mobile electricity
Words or the tablet computer with wireless communication ability.First communication device 210 includes the first wireless transceiver 215 and one
Or multiple first processors 217.First wireless transceiver 215 is by wireless channel 230 (for example, when first communication device 210 is
It is downlink channel during BS) send reference signal 235 to secondary communication device 220.At secondary communication device 220, pass through
The second wireless transceiver 225 in secondary communication device 220 receives reference signal 235.In secondary communication device 220, receive
To reference signal 235 then by one or more second processors 227 to analyzing, believed with generating complete channel quality
Breath, including the CQI of all subbands.Second wireless transceiver 225 is by Return Channel 240 (if secondary communication device 220
It is the UE in mobile communication system, then it can be uplink channel) it is returned only including complete to first communication device 210
The limited channel quality information of a part for channel quality information.Limited channel is received in the first wireless transceiver 215
After quality information, one or more first processors 217 are the embodiment of method disclosed by the invention, limited to this
Information is handled to estimate channel quality distribution map.
One aspect of the present invention provides a kind of method for the frequency resource for being used to distribute wireless channel, first communication device
It communicates on the wireless channel with secondary communication device, wherein, this method includes, by first communication device estimation channel
Channel quality distribution map in bandwidth.The distribution map includes the CQI at multiple frequencies.Channel width includes multiple bandwidth portions
Point, each portions of bandwidth includes one or more subbands.It is each included with nominal frequency.Although nominal frequency can be selected
For any frequency in subband, but for most of mobile communication system, usually by the nominal frequency selected as subband
Centre frequency.The following band edge frequency of channel width and upper band edge frequency are boundary.
Fig. 3 describes the step of estimation channel quality distribution map according to exemplified embodiment of the present invention.
First communication device sends reference signal by channel to secondary communication device first, to make secondary communication device
It can determine the CQI of all subbands in channel width and the broadband CQI (steps 310) of channel.Broadband CQI is channel width
On average CQI.
First communication device receives the CQI of broadband CQI and multiple subbands selected as limited from secondary communication device
Channel quality information (step 320).Particularly, the subband of selection is different so that the nominal frequency of the subband of these selections
It is different from each other.Preferably, although disclosed method is not strict with, the CQI of the subband each selected is the second communication
Highest CQI in the one or more subbands for the portions of bandwidth that device measures.
Then, it by the way that the CQI of the subband of multiple selections and the nominal frequency of the subband of selection are merged into distribution map, is formed
First part's (step 330) of distribution map.When the nominal frequency of the subband of selection does not include lower band edge frequency, Yi Zhongxuan
It is the broadband CQI value distributed to distribution map for lower band edge frequency to select.Similarly, when the nominal frequency does not include upper frequency band
During marginal frequency, the broadband CQI value for upper band edge frequency is optionally distributed to distribution map.
Later, the second part (step 340) of distribution map is formed.In step 340, first, in accordance with being ranked sequentially or arrange
In all frequencies involved in the first part for forming distribution map.Pass through each pair of two of the first part for belonging to distribution map
Side frequency, first including the intermediate frequency between two side frequencies estimates CQI, forms the second part of distribution map.In
Between frequency be equidistant frequency between two side frequencies.Had the advantages that using intermediate frequency it is potential, this is because it is logical
Number of the method at the processing unit (for example, one or more of Fig. 2 first processors 217) of first communication device can often be made
Word implementation becomes simple.
It is the important step for mitigating problem of roll-offing greatly in the second part of step 340 formation distribution map.With reference to figure 1.Selection
Subband guided with label 135a-d after according to being ranked sequentially of its nominal frequency.Inventor makes following observation.By
Each in the subband 135a-d of selection is typically all the highest CQI in all subbands of a portions of bandwidth, so such as
Shown from frequency response 110, the subband between the subband of the adjacent selection of any two that secondary communication device measures
Original CQI value is in most cases all not more than the CQI of at least one of two adjacent subbands of selection.It is rung with frequency
Answer 110 as an example.Between subband 135b and 135c, frequency response 110 is recessed.In order to more accurately estimate two subbands
The CQI of subband between 135b, 135c understands inflection point 143 and is advantageous.It however, generally cannot be based on limited channel quality
Information estimates the inflection point.It has been observed by the inventors that intermediate frequency of the inflection point normally close to the subband in two adjacent selections.
The basis of intermediate frequency is selected when obtaining the first estimation CQI which form the present invention.For example, if the first estimation CQI is enough
One or two CQI of the frequency band of the selection adjacent less than two, the channel quality point between the subband of two adjacent selections
Butut just becomes spill, so as to alleviate big problem of roll-offing.The son of intermediate frequency and adjacent selection can be obtained by interpolation
The CQI of the frequency between a subband in band.Based on foregoing observations, according to hereafter determining first estimation CQI.
First, each CQI obtained in the first part of distribution map is converted into corresponding linear CQI value.As herein
Used, linear CQI value is the measurement with the channel quality at specific frequency or in given bandwidth (for example, channel work(
Rate gain or Signal to Interference plus Noise Ratio (SINR)) linearly proportional nonnegative number.Herein in specification and appended
" conversion " from CQI to linear CQI or " conversion " from linear CQI to CQI are also used in claims, before this hint
The CQI and linear CQI value stated is equivalent in the sense that the channel quality that they represent same degree.Before if CQI has met
The meaning of linear CQI value stated, then aforementioned switch process is just simply using the CQI as linear CQI value.However, most
In number mobile communication standard (for example, LTE standard), CQI is the channel quality measurement rather than linear-scale of logarithmic scale.One
In a embodiment, it is as follows that the single CQI obtained in the first part of distribution map is converted into corresponding linear CQI value execution.
Single CQI is converted to by spectrum efficiency according to the mapping scheme being pre-selected first.Then according to the mapping scheme being pre-selected
Spectrum efficiency is converted to the SINR of linear-scale, SINR is thus considered as corresponding linear CQI value.If first and second is logical
T unit is operated in LTE system, then the mapping scheme being pre-selected is based on LTE specification.
Secondly, the linear first estimation CQI value of intermediate frequency is determined.Indicate the first linear CQI value and the second linear CQI value
As two corresponding linear CQI values respectively for two side frequencies.It obtains and is counted by average first and second CQI values
The average value of calculation.Then certain offset is subtracted from the average value to generate linear first estimation CQI value.According to the present invention
Illustrative embodiment, which is determined according to the frequency interval between two side frequencies.Particularly, the offset
It is the function of frequency interval.Preferably, for linear function so as to offset and frequency interval linearly.Note that the letter
Number needs to adapt to the actual numerical value number of the linear CQI value of the subband of selection, so as to estimation channel quality distribution map wherein
Any part will not all become negative.It shall yet further be noted that when frequency interval non-zero, offset is positive quantity.By by linear first
Estimation CQI value is converted to the first estimation CQI, can obtain the first estimation CQI from the linear first estimation CQI value.With being previously mentioned
It is similar, it is aforementioned if the first estimation CQI is defined as with the linearly proportional numerical value of measurement with channel quality
Switch process just simply using linear first estimation CQI value as first estimation CQI.
The illustrative embodiment party for the linear first estimation CQI value for determining intermediate frequency is described in detail below by way of Fig. 4
Formula, Fig. 4 are the curve graphs of linear CQI value-frequency.Without loss of generality, two adjacent frequencies of the first part of distribution map will be belonged to
Rate is appointed as frequency xn415 and xn+1425.It is expressed as dnTwo side frequencies 415,425 between frequency interval 460 by following formula
It provides：
dn=xn+1-xn。
Frequency xn415 and xn+1425 are respectively provided with linear CQI value yn410 and yn+1420.Expectation estimation intermediate frequency x 'n
Linear first estimation CQI value y ' at 445n440, wherein：
x′n=(xn+xn+1)/2。
Estimation procedure is as follows.Two coordinate (x are built firstn,yn) and (xn+1,yn+1) between straight line 470.In intermediate frequency
Rate x 'nAt 445, the linear CQI value on line 470 is found430 areThat is, the line of two side frequencies
The average value of property CQI value.Pass through value430 subtract length as α × dnOffset 465 to the cutting edge aligned first estimation CQI value y 'n
440, wherein, α is scale factor.Then：
y′n=(yn+yn+1)/2–αdn
It is readily apparent that linear first estimation CQI value 440 is determined according to frequency interval 460.In addition, coordinate (xn,
yn)、(xn+1,yn+1) and (x 'n,y′n) arrangement so that the channel quality distribution map of estimation looks like the shape of " hook number ".It is surplus
The problem of lower, will be to determine α.Note that unique α is used for any two side frequency for belonging to the first part of distribution map.Below will
Provide the process of determining α.
With reference to figure 3, formed after the second part of distribution map, estimated by include target frequency second in step 340
CQI is counted, obtains the Part III of distribution map, wherein target frequency is not any frequency for the first or second part for belonging to distribution map
Rate (step 350).The one or more estimation CQI for obtaining the method for the second estimation CQI by being substantially similar to obtain can
To be further included in the Part III of distribution map.Second estimation CQI's is determining as follows.First, it is equivalent to by interpolation
Belong to two or more linear CQI values of the CQI of the first or second part of distribution map, determine linear the second of target frequency
Estimate CQI value.Although any interpolation schemes can be used because linear insert method calculate it is simple, it is advantageous to make
Use linear insert method.Secondly, the linear second estimation CQI value is converted into the second estimation CQI.Again, if the second estimation CQI
It is defined as with the numerical value linearly proportional with the measurement of channel quality, then aforementioned switch process is just simply by line
Property second estimation CQI value as second estimation CQI.
Fig. 5 is the curve graph of linear CQI- frequencies, and which depict the linear CQI by all frequencies in channel width 520
It is worth the channel quality distribution map 510 of the estimation represented.Linear interpolation is used for linear in the Part III for obtaining distribution map 510
CQI value.Using linear interpolation in this case, comparative example factor-alpha it is determining as follows.It is initially noted that channel strip
The average value of linear CQI value on wide 520 should be equal to linear broadband CQI value 530.Therefore, α's is determining under following constraints：
In the curve graph of linear CQI- frequencies, area of the channel below channel quality distribution map 510 and in channel width 520
515 are multiplied by channel width 520 equal to linear broadband CQI value 530.The quantity of frequency that N is the first part to form distribution map is enabled,
Thus there is N number of ordered pair (xn,yn), n=1,2 ..., N, wherein, xnBe distribution map first part in n-th of frequency,
And ynIt is xnCorresponding linear CQI value.In addition, x1<x2<…<xN.By some algebraic operations, it can be found that α is given by following formula
Go out：
Wherein, B is channel width, and P is linear broadband CQI value, and dn=xn+1-xnIt is xnAnd xn+1Between frequency between
Every.
After channel quality distribution map is had estimated, can frequency be selected according to the entirety for the CQI being recorded in distribution map
A part in rate resource.First communication device can be communicated by the frequency resource part of selection with second device as a result,.
General or specialized computing device, computer processor or including but not limited to digital signal processor can be used
(DSP), application-specific integrated circuit (ASIC), field programmable gate array (FPGA) and according to the technical configuration of the disclosure or programming
The electronic circuits of other programming devices implements embodiment disclosed herein.
Without departing from the spirit or essential characteristics of the present invention, the present invention can be implemented as other concrete forms.
It is therefore contemplated that all aspects of present embodiment are all exemplary rather than restricted.The scope of the present invention is by appended
Claims indicate rather than the foregoing specification, and are intended to make in the full scope of equivalents and meaning of claim
All changes are intended to be included within.
Claims (18)
1. a kind of for distributing the method for the frequency resource of wireless channel, first communication device is wireless at this with secondary communication device
It communicates on channel, the method includes：Channel matter in the bandwidth of the channel is estimated by the first communication device
Distribution map is measured, the distribution map is included in the channel quality indicator (CQI) at multiple frequencies, and channel width includes multiple sons
Band, each subband have nominal frequency, wherein, estimate that the distribution map includes：
Multiple CQI of the broadband CQI of the channel and the subband of selection are received from the secondary communication device；
The first part of the distribution map is formed, wherein, the first part for forming the distribution map includes：By the son of multiple selections
The nominal frequency of subband with CQI and selection is merged into the distribution map；And
By each pair of two side frequencies of the first part for belonging to the distribution map include described two side frequencies it
Between intermediate frequency the first estimation CQI, form the second part of the distribution map；
And the first estimation CQI wherein, is determined by the first estimation subprocess, the first estimation subprocess includes：
The each CQI obtained in the first part of the distribution map is converted into corresponding linear CQI value, thus described two phases
Adjacent frequency rate is respectively provided with the first linear CQI value and the second linear CQI value；And
By subtracting offset from the average value of the described first linear CQI value and the second linear CQI value, the intermediate frequency is determined
It is linear first estimation CQI value, wherein, the offset is determined according to the frequency interval between described two side frequencies, by
This can obtain the first estimation CQI by the way that the linear first estimation CQI value is converted to the first estimation CQI,
Wherein, estimate that the distribution map further comprises：
The Part III of the distribution map is formed, wherein, the Part III for forming the distribution map includes：Including target frequency
Second estimation CQI of rate, wherein target frequency is not the first part for belonging to the distribution map or any frequency of second part；
And the second estimation CQI wherein, is determined by the second estimation subprocess, the second estimation subprocess includes：
The first part of the distribution map is subordinated to by interpolation or the CQI of second part is converted that two or more are linear
CQI value determines the linear second estimation CQI value of the target frequency, and thereby, it is possible to by estimating CQI by described linear second
Value is converted to the second estimation CQI and obtains the second estimation CQI.
2. according to the method described in claim 1, wherein, the offset and the frequency interval are linearly.
3. according to the method described in claim 1, wherein, the following band edge frequency of channel width and upper band edge are frequently
Rate is boundary, and wherein, and the first part for forming the distribution map further comprises：
When selected subband nominal frequency not include the lower band edge frequency when, to the distribution map distribution for
The value of the broadband CQI of the lower band edge frequency；And
When selected subband nominal frequency not include the upper band edge frequency when, to the distribution map distribution for
The value of the broadband CQI of the upper band edge frequency.
4. according to the method described in claim 1, wherein, linear insert method is used to determine the linear second estimation CQI value.
5. according to the method described in claim 1, wherein, the offset is determined by the way that the frequency interval is made to be multiplied by scale factor
Amount, the scale factor determine, so that in the curve graph of linear CQI- frequencies, to be distributed with the channel quality of linear COI values
Area of the figure below and in channel width is equal to the value for being multiplied by linear broadband CQI value by the channel width and providing,
In, obtain the linear broadband CQI value by converting the broadband CQI.
6. according to the method described in claim 1, wherein, estimate that the distribution map further comprises：
Reference signal is sent to the secondary communication device by the channel, so that the secondary communication device can determine
The CQI of all subbands in the channel width and broadband CQI.
7. according to the method described in claim 1, wherein：
The channel width is divided into multiple portions of bandwidth, and each portions of bandwidth has one or more subbands；And
The CQI of the subband of single selection is one or more subbands of the specific bandwidth part for the subband for including the single selection
In highest CQI.
8. according to the method described in claim 1, wherein, the single CQI obtained in the first part of the distribution map is turned
Corresponding linear CQI value is changed to include：
According to the mapping scheme being pre-selected, single CQI is converted into spectrum efficiency；And
According to the mapping scheme being pre-selected, the spectrum efficiency is converted to the Signal to Interference plus Noise Ratio of linear-scale
(SINR), the Signal to Interference plus Noise Ratio is thus considered as corresponding linear CQI value.
9. according to the method described in claim 8, wherein, the mapping scheme being pre-selected is based on LTE specification.
10. according to the method described in claim 1, wherein, the first communication device is base station.
11. according to the method described in claim 1, wherein, the linear first estimation CQI value y is determined according to the following formulan′：
yn'=(yn+yn+1)/2–α(xn+1-xn)
Wherein：
xnAnd xn+1Represent two side frequencies, wherein, xn+1>xn,
ynRepresent the x obtainednThe described first linear CQI value；
yn+1Represent the x obtainedn+1The described second linear CQI value；And
α is scale factor；
And wherein：
Wherein：
N is the quantity of the frequency for the first part to form the distribution map；
xnBe the distribution map first part in n-th of frequency, wherein, 1≤n≤N, xnN number of value be arranged such that：
x1<x2<…<xN；
ynCorrespond to xnCQI linear CQI value, 1≤n≤N；
B is channel width；
P is the linear broadband CQI value obtained by converting the broadband CQI；And
dn=xn+1-xn。
12. according to the method described in claim 1, further comprise：
A part of frequency resource is selected according to the entirety for the CQI being recorded in the distribution map, so that the first communication dress
It puts and is communicated by the frequency resource part of selection with the secondary communication device.
13. a kind of base station for being used to communicate with user equipment by wireless channel, including：
One or more processors are configured as performing the channel quality distribution in the bandwidth for estimating the channel
The process of figure, the distribution map are included in the channel quality indicator (CQI) at multiple frequencies, and channel width includes multiple sons
Band, each subband have nominal frequency；And
Wireless transceiver is configured as the more of the subband for receiving the broadband CQI of the channel from the user equipment and selecting
A CQI；
Wherein, the process includes：
The first part of the distribution map is formed, wherein, the first part for forming the distribution map includes：By the son of multiple selections
The nominal frequency of subband with CQI and selection is merged into the distribution map；And
By each pair of two side frequencies of the first part for belonging to the distribution map include described two side frequencies it
Between intermediate frequency the first estimation CQI, form the second part of the distribution map；
And the first estimation CQI wherein, is determined by the first estimation subprocess, the first estimation subprocess includes：
The each CQI obtained in the first part of the distribution map is converted into corresponding linear CQI value, thus described two phases
Adjacent frequency rate is respectively provided with the first linear CQI value and the second linear CQI value；And
By subtracting offset from the average value of the described first linear CQI value and the second linear CQI value, the intermediate frequency is determined
It is linear first estimation CQI value, wherein, the offset is determined according to the frequency interval between described two side frequencies, by
This can obtain the first estimation CQI by the way that the linear first estimation CQI value is converted to the first estimation CQI,
Wherein, the process further comprises：
The Part III of the distribution map is formed, wherein, the Part III for forming the distribution map includes：Including target frequency
Second estimation CQI of rate, wherein target frequency is not the first part for belonging to the distribution map or any frequency of second part；
And the second estimation CQI wherein, is determined by the second estimation subprocess, the second estimation subprocess includes：
The two of the first part of the distribution map or the CQI conversions of second part are subordinated to by using linear insert method interpolation
A CQI value, and determine the linear second estimation CQI value of the target frequency, as a result, by estimating CQI by described linear second
Value is converted to the second estimation CQI, obtains the second estimation CQI.
14. base station according to claim 13, wherein, the offset and the frequency interval are linearly.
15. base station according to claim 13, wherein, the following band edge frequency of channel width and upper band edge
Frequency is boundary, and wherein, and the first part for forming the distribution map further comprises：
When selected subband nominal frequency not include the lower band edge frequency when, to the distribution map distribution for
The value of the broadband CQI of the lower band edge frequency；And
When selected subband nominal frequency not include the upper band edge frequency when, to the distribution map distribution for
The value of the broadband CQI of the upper band edge frequency.
16. base station according to claim 13, wherein, the single CQI that will be obtained in the first part of the distribution map
Corresponding linear CQI value is converted to include：
According to the mapping scheme being pre-selected, single CQI is converted into spectrum efficiency；And
According to the mapping scheme being pre-selected, the spectrum efficiency is converted to the Signal to Interference plus Noise Ratio of linear-scale
(SINR), the Signal to Interference plus Noise Ratio is thus considered as corresponding linear CQI value.
17. base station according to claim 16, wherein, the mapping scheme being pre-selected is based on LTE specification.
18. base station according to claim 13, wherein, the linear first estimation CQI value y is determined according to the following formulan′：
yn'=(yn+yn+1)/2–α(xn+1-xn)
Wherein：
xnAnd xn+1Represent two side frequencies, wherein, xn+1>xn,
ynRepresent the x obtainednThe described first linear CQI value；
yn+1Represent the x obtainedn+1The described second linear CQI value；And
α is scale factor；
And wherein：
Wherein：
N is the quantity of the frequency for the first part to form the distribution map；
xnBe the distribution map first part in n-th of frequency, wherein, 1≤n≤N, xnN number of value be arranged such that：
x1<x2<…<xN；
ynCorrespond to xnCQI linear CQI value, 1≤n≤N；
B is channel width；
P is the linear broadband CQI value obtained by converting the broadband CQI；And
dn=xn+1-xn。
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