CN104468052A - Method for selecting channel quality indicating information - Google Patents
Method for selecting channel quality indicating information Download PDFInfo
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- CN104468052A CN104468052A CN201310436323.0A CN201310436323A CN104468052A CN 104468052 A CN104468052 A CN 104468052A CN 201310436323 A CN201310436323 A CN 201310436323A CN 104468052 A CN104468052 A CN 104468052A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0057—Physical resource allocation for CQI
Abstract
The invention relates to the wireless communication field, and discloses a method and device for selecting channel quality indicating information. According to the method and device for selecting the channel quality indicating information, a wireless channel region is divided into large time delay channels and non-large-time-delay channels according to parameters reflecting channel states, and then diffident CQI reporting strategies are adopted according to the scenes of channel environments. The conservative CQI reporting strategy is selected in large time delay channels, and the relatively radical CQI reporting strategy is selected in small time delay channels. The reporting value of the CQI in each scene is made more accurate through detail division of channel scenes, the selection strategies of the CQI feed back the down link channel state information of current UE as faithful as possible, so that it is guaranteed that the BLER of a physical layer under severe channel environments can be maintained in reasonable range, the overall performance of links is improved, downlink dispatching is more reasonable the downlink throughput is improved as far as possible, and the speed of the UE is increased as far as possible.
Description
Technical field
The present invention relates to wireless communication field, particularly the system of selection of channel quality indication (CQI) information.
Background technology
At Long Term Evolution (Long Term Evolution, be called for short " LTE ") in system, terminal periodic or aperiodic ground to network side or base station (eNodeB) feeding back channel state information (Channel StateInformation is called for short " CSI ").Wherein, channel condition information comprises: order designator (Rank Indicator, be called for short " RI "), pre-coding matrix index (Precoding Matrix Index, be called for short " PMI "), CQI (Channel Quality Indicator, be called for short " CQI ").For PMI and CQI, support the feedback of two types, be respectively broadband feedback and subband feedback.In broadband feedback, Resource Units (REs) all in system bandwidth in a subframe can be used for calculating feedback information.In subband feedback, the REs in the specific bandwidth of a subframe is just used to calculate feedback information.The code check and the modulation system that report the transmission block that decide eNodeB scheduling user's set (User Equipment is called for short " UE ") of broadband CQI, the whether accurate transmission rate on UE that therefore broadband CQI reports has important impact.
In LTE system, the calculating of CQI is according to current transmission mode and optimum RI and PMI of optimum present channel, therefore, when description later calculates CQI, supposes that these information are known.
CQI selects normally based on Signal to Interference plus Noise Ratio (Signal to Interference plusNoise Ratio, be called for short " SINR ").At OFDM (Orthogonal Frequency DivisionMultiple Access, be called for short " OFDMA ") in system, a transmission block can occupy multiple subcarrier, the SINR of each subcarrier may vary widely, effective SINR maps and is to locate a compression function a different set of SINR sequence mapping is become a single additive white Gaussian noise (AdditiveWhite Gaussian Noise, be called for short " AWGN ") under effective SINR value, then just can be tabled look-up by this effective SINR and obtain corresponding Block Error Rate (Block Error Ratio, be called for short " BLER ") value, and then may be used for modulation and coding strategy (Modulation and Coding Scheme, be called for short " MCS ") select CQI to report.The calculating of effective SINR can be expressed as: γ
eff=f ({ γ
k), wherein, { γ
kbe the SINR of each subcarrier.
The calculating of effective SINR has multiple method, and the most frequently used is that the effective SINR of index maps (EESM).When using EESM, require that each subcarrier all uses identical modulation and coded system (MCS).EESM is an effective SINR instant channel state mapping, and to be obtained the BLER under this channel status from AWGN performance curve by this scalar value, therefore it will meet following criterion:
BLER({γ
k})≈BLER
AWGN(γ
eff)
BLER ({ γ
k) be instant channel state { γ
kunder actual Block Error Rate, BLER
aWGN(SINR
eff) be Block Error Rate under equivalent AWGN channel.In order to make mapping function and channel have nothing to do, this criterion need realize all setting up to all channels.Equivalence SINR computing formula is as follows:
Wherein, α=[γ
1, γ
2..., γ
n] be SINR on each subcarrier, β is the scale factor relevant with MCS, by optimizing this parameter, makes EESM mapping function be applicable to corresponding MCS.
After calculating effective SINR, compared by the signal-noise ratio threshold of effective SINR and CQI, select suitable CQI to report value.
The method calculating effective SINR based on EESM also exists certain error: when obtaining the calculating parameter β of effective SINR, usually several typical channel is only simulated, may differ greatly with the channel of reality, and do not consider frequency selective fading and the time selective fading of channel, therefore because β value is inaccurate, effective SINR of calculating also has error.Although under static channel or indoor environment, the methodical error calculating effective SINR based on EESM is less, and CQI reports more accurate; But because parameter P value is inaccurate under actual large scale decline outdoor channel condition, CQI can be caused to report too radical, cause the BLER of physical layer higher, the performance of whole link be caused to having a strong impact on.Therefore, CQI reports can not be always optimum under different channel circumstances, is calculate based on EESM the major defect that SINR selects CQI scheme.
Summary of the invention
The object of the present invention is to provide a kind of system of selection and device of channel quality indication (CQI) information, CQI selection strategy is made to feed back the downlink channel status information status of current UE as far as possible faithfully, thus make descending scheduling more reasonable, improve the speed of descending throughput and lifting UE as much as possible.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of system of selection of channel quality indication (CQI) information, comprise following steps:
S1. the parameter of reaction channel status is obtained;
S2. carry out channel differentiation according to described parameter, wireless channel is divided into long time delay channel and non-long time delay channel;
S3. distinguish result according to different channels, adopt different CQI reporting policies, report; Wherein, described different CQI reporting policy comprises: in same CQI grade, the signal-noise ratio threshold value of the signal-noise ratio threshold value under long time delay channel corresponding to described CQI grade under being less than non-long time delay channel corresponding to described CQI grade
Embodiments of the present invention additionally provide a kind of choice device of channel quality indication (CQI) information, comprise: parameter acquisition module, channel region sub-module, CQI determination module and CQI reporting module;
Described parameter acquisition module is for obtaining the parameter of reaction channel status;
The parameter that described channel region sub-module is used for obtaining according to described acquisition module carries out channel differentiation, wireless channel is divided into long time delay channel and non-long time delay channel;
The channel that described CQI determination module exports according to described channel region sub-module distinguishes result, adopts different CQI reporting policies, reports for described CQI reporting module; Wherein, described different CQI reporting policy comprises: in same CQI grade, the signal-noise ratio threshold value of the signal-noise ratio threshold value under long time delay channel corresponding to described CQI grade under being less than non-long time delay channel corresponding to described CQI grade.
Embodiment of the present invention in terms of existing technologies, by the parameter of reacting channel status, wireless channel is divided into long time delay channel and non-long time delay channel, then, according to the scene of channel circumstance, adopt different CQI reporting policies, wherein, in same CQI grade, the signal-noise ratio threshold value of the signal-noise ratio threshold value under long time delay channel corresponding to described CQI grade under being less than non-long time delay channel corresponding to described CQI grade.Under long time delay channel, select conservative CQI reporting policy, under little time delay channel, select relatively radical CQI reporting policy, by the detailed division to channel scenario, the CQI of often kind of scene is made to report value more accurate, CQI selection strategy feeds back the downlink channel status information status of current UE as far as possible faithfully, ensure that the CQI that terminal is selected under static state or indoor environments is accurate, and be unlikely to too radical at the CQI that outdoor poor channel environments is selected, ensure that the BLER of physical layer under poor channel environments maintains zone of reasonableness, improve the overall performance of link, thus make descending scheduling more reasonable, improve the speed of descending throughput and lifting UE as much as possible.
In addition, in described step S1, obtain channel delay Delay measured value, as the parameter of reaction channel status;
In described step S2, comprise following sub-step:
Judge whether described channel delay measured value is less than or equal to the first time delay threshold value, in this way, then described wireless channel is static channel; As no, then judge whether described channel delay measured value is less than or equal to the second time delay threshold value, in this way, then described wireless channel is little time delay channel; As no, then described wireless channel is long time delay channel; Wherein, described second time delay threshold value is greater than described first time delay threshold value.
Adopt channel delay measured value to can be good at reflecting channel status, thus well can distinguish channel circumstance, feed back rational CQI value.
In addition, in the step obtaining channel delay measured value, the channel delay measured value of multiple descending sub frame is obtained;
After the step obtaining channel delay measured value, smoothing to multiple channel delay measured value by following formula, obtain the delay measurements smoothly:
f(n)=(1-α)·f(n-1)+α·τ
max(n)
f(0)=τ
max(0)
Wherein, τ
maxn () is the n-th secondary channel delay measurements, f (n) is the n-th secondary channel time delay smooth value, and α is smoothing factor;
In described step S2, according to described level and smooth after channel delay measured value carry out channel differentiation.
Multiframe is carried out smoothly to channel delay measured value, channel delay measured value can be made more accurate, make channel delay measured value react channel status truly further.
In addition, in the step obtaining channel delay measured value, separately carry out if channel delay measurement is two antennas, then the mean value of two antenna measurements got by channel delay measured value.Make channel delay measured value more accurate, make channel delay measured value react channel status truly further.
In addition, in described step S1, obtain maximum Doppler expansion, as the parameter of reaction channel status;
In described step S2, comprise following sub-step:
Judge whether the expansion of described maximum Doppler is less than or equal to the first expander gate limit value, and in this way, then described wireless channel is static channel; As no, then judge whether the expansion of described maximum Doppler is less than or equal to the second expander gate limit value, and in this way, then described wireless channel is little time delay channel; As no, then described wireless channel is long time delay channel; Wherein, described second expander gate limit value is greater than described first expander gate limit value.
Adopt maximum Doppler expansion also to can be good at reflecting channel status, thus well can distinguish channel circumstance, feed back rational CQI value.
In addition, in described step S3, comprise following sub-step:
Distinguish result according to channel, choose described channel and distinguish signal-noise ratio threshold value corresponding to each CQI grade under channel corresponding to result;
Obtain the Signal to Interference plus Noise Ratio SINR value that channel estimating is measured, and adopt index effective SINR mapping method to calculate effective SINR value;
According to the signal-noise ratio threshold value corresponding to described effective SINR value and described each CQI grade, select CQI to report value, report.
According to the scene of channel circumstance, use different CQI selection strategies and method, by the detailed division to channel scenario, make the CQI of often kind of scene report value more accurate, thus make descending scheduling more reasonable, improve the speed of descending throughput and lifting UE as much as possible.
Accompanying drawing explanation
Fig. 1 is the flow chart of the system of selection of CQI according to first embodiment of the invention;
Fig. 2 adopts channel delay measured value to carry out the flow chart of channel differentiation according to the system of selection of the CQI of first embodiment of the invention;
Fig. 3 is the structural representation of the choice device of CQI according to second embodiment of the invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the embodiments of the present invention are explained in detail.But, persons of ordinary skill in the art may appreciate that in each execution mode of the present invention, proposing many ins and outs to make reader understand the application better.But, even without these ins and outs with based on the many variations of following execution mode and amendment, each claim of the application technical scheme required for protection also can be realized.
First execution mode of the present invention relates to the system of selection of a kind of channel quality indication (CQI) information CQI, and as shown in Figure 1, the method first obtains the parameter of reaction channel status; Then, the parameter according to obtaining carries out channel differentiation, wireless channel is divided into long time delay channel and non-long time delay channel; Distinguish result according to different channels, adopt different CQI reporting policies, report; Wherein, different CQI reporting policies comprises: in same CQI grade, and the signal-noise ratio threshold value under long time delay channel corresponding to CQI grade is less than the signal-noise ratio threshold value under non-long time delay channel corresponding to CQI grade.The CQI thresholding value of different delay by obtaining the emulation under the channel of different delay, can generally get the optimal value of emulation.
In the digital communication of classics, time-delay power spectrum (Power Delay Profile) is namely that the average power of channel exports, and it is the function of time delay τ.What time-delay power spectrum (PDP) embodied is the relation in fading channel and path delay.Channel multi-path time delay is expanded, and is the scope of the basic time delay τ for non-zero of time-delay power spectrum.In the present embodiment, using channel delay (Delay), is the amplification that classical channel multi-path time delay is expanded, and is defined as the scope that time-delay power spectrum is greater than the time delay τ of certain threshold value.
PDP can be good at reflecting channel status, well can distinguish, feed back rational CQI value to channel circumstance.Therefore present embodiment is according to channel delay (Delay), distinguishes different channel circumstances, and under different channel circumstances, select the signal-noise ratio threshold value of different CQI, carries out CQI selection.Specifically, as shown in Figure 2, following steps are comprised:
Step 201, obtains channel delay Delay measured value, as the parameter of reaction channel status.
Prior art is adopted to the Measurement Algorithm of Delay, does not repeat them here.Using the Delay measured value of the descending sub frame for calculating CQI of agreement regulation, carrying out the differentiation of subsequent channel scene.The definition of channel scenario can with reference to the channel model of 3GPP, simple understanding can be divided into three kinds: indoor scene (i.e. static channel), outdoor move at a slow speed (i.e. little time delay channel), outdoor fast moving (i.e. long time delay channel), performs step 202 and completes concrete differentiation process to 206.
In addition, it is worth mentioning that, the instantaneous measure of channel delay can not react the state of channel sometimes exactly, therefore in order to ensure the accurate of Delay measured value, also proposes a kind of level and smooth strategy for Delay measured value in the present embodiment.Specifically, obtain the channel delay measured value of multiple descending sub frame, smoothing to multiple channel delay measured value by following formula, obtain the channel delay measured value smoothly, in the step of follow-up differentiation channel scenario, then carry out channel differentiation according to the delay measurements after level and smooth:
f(n)=(1-α)·f(n-1)+α·τ
max(n)
f(0)=τ
max(0)
Wherein, τ
maxn () is the n-th secondary channel delay measurements, f (n) is the n-th secondary channel time delay smooth value, and α is smoothing factor.When channel delay can not suddenly change, the delay measurements of previous moment and the delay measurements of current time are more or less the same, and therefore, the value of α is less, and the value after level and smooth is also more stable, and general α is between 0.05 to 0.3, and such as value is 0.2.
In addition, what deserves to be explained is, when obtaining channel delay measured value, separately carry out if channel delay measurement is two antennas, then the mean value of two antenna measurements got by channel delay measured value, makes channel delay measured value more accurate, make channel delay measured value react channel status truly further.
Step 202, judges whether channel delay measured value is less than or equal to the first time delay threshold value, in this way, then performs step 203; As no, then perform step 204.
Step 203, judges that wireless channel is as static channel.
Step 204, judges whether channel delay measured value is less than or equal to the second time delay threshold value, in this way, then performs step 205; As no, then perform step 206.
Step 205, judges that wireless channel is as little time delay channel.
Step 206, judges that wireless channel is as long time delay channel.
It should be noted that, the second time delay threshold value is greater than the first time delay threshold value, and static channel and little time delay channel are non-long time delay channel.
When actual realization, step 202 can represent with a formula to 206, that is, according to Delay measured value, selects corresponding CQI thresholding identification parameter flag
cQI_TH.CQI thresholding identification parameter flag
cQI_TH, being to distinguish different channel circumstances when selecting CQI, using different CQI to select threshold value, thus selecting suitable CQI.
Be described for the channel delay measured value after level and smooth, the channel delay measured value after level and smooth is designated as
then flag
cQI_THvalue obtain in such a way:
Wherein, T
th1be the first time delay threshold value, T
th2be the second time delay threshold value, can be passed through emulation and obtain, relevant with the performance of terminal receiver.Flag
cQI_TH=0 represents static channel, flag
cQI_TH=1 represents little time delay channel, thinks that channel circumstance is comparatively simple, flag
cQI_TH=2 represent long time delay channel, think that channel circumstance is severe.
After wireless channel being divided into static channel, little time delay channel, long time delay channel, in step 207 is to 209, distinguishes result according to different channels, adopt different CQI reporting policies, report.
Step 207, distinguishes result according to channel, chooses channel and distinguishes signal-noise ratio threshold value corresponding to each CQI grade under channel corresponding to result; That is, according to CQI thresholding identification parameter flag
cQI_TH, choose the signal-noise ratio threshold value that suitable CQI selects.Suitable CQI selects threshold value to refer to that the CQI of terminal reports can ensure that terminal BLER meets certain requirements (such as, BLER is less than or equal to 10%), can with reference to the calculating of CQI in background technology.Can following formula be passed through, according to the difference of channel scenario, determine the signal-noise ratio threshold value that different CQI grades is corresponding:
Wherein,
for CQI grade is c
cQItime signal-noise ratio threshold value, its with reference to value by parameter f lag
cQI_THdetermine.
being respectively CQI grade under static channel, little time delay channel, long time delay channel is c
cQItime signal-noise ratio threshold value.
At this, what deserves to be explained is, general CQI thresholding is all in AWGN(static channel) under emulation obtain, therefore under fading channel (long time delay channel), this CQI thresholding is just on the low side, thus causes the CQI reported to be radical; If long time delay channel uses another one CQI thresholding (CQI thresholding is larger relative to static channel value), the CQI so reported is just less, conservative.In the prior art, do not distinguish channel scenario, the corresponding signal-noise ratio threshold value of each CQI grade; And present embodiment is in each CQI grade, for static channel, little time delay channel, long time delay channel, there is different signal-noise ratio threshold values, can solve like this in different wireless channel environments, the problem that the method that CQI selects cannot be unified.
Step 208, obtains the Signal to Interference plus Noise Ratio SINR value that channel estimating is measured, and adopts index effective SINR mapping (EESM) method to calculate effective SINR value.
Step 209, according to the signal-noise ratio threshold value corresponding to effective SINR value and each CQI grade, selects CQI to report value, reports.
Such as, in existing protocol specification, CQI has 15 grades, and so, when selecting CQI to report value, first judge whether effective SINR value is greater than signal-noise ratio threshold value corresponding to CQI15, if be greater than, CQI reports value to be 15; Otherwise signal-noise ratio threshold value corresponding with CQI14 again compares, if be greater than, CQI reports value to be 14, otherwise signal-noise ratio threshold value corresponding with CQI13 again compares ..., repeat above step, until choose suitable CQI.
In addition, in order under long time delay channel, conservative CQI reporting policy is selected, under little time delay channel, select relatively radical CQI reporting policy, report value to carry out in the process reported choosing different CQI, the different scene above mentioned uses different CQI thresholdings to be a kind of scheme, other schemes can have a lot, such as, distinguish result according to channel, calculate CQI and report value, under long time delay channel, report after the CQI of calculating is subtracted 1.Or distinguish result according to channel, a calculating K CQI reports value; Under long time delay channel, reporting in value at K the CQI calculated selects a minimum CQI to report, and K is the number of the CQI that can obtain in CQI report cycle here, such as, there are 5 descending sub frames in CQI report cycle, so just have 5 CQI value to obtain.As long as the principle of scheme is under the scene of long time delay, select conservative CQI to report, and in the scene of little time delay, select relatively radical CQI reporting policy, all within protection scope of the present invention, do not enumerate at this.
Compared with prior art, wireless channel is divided into long time delay channel and non-long time delay channel by the parameter of reacting channel status by present embodiment, then, according to the scene of channel circumstance, adopt different CQI reporting policies, wherein, in same CQI grade, the signal-noise ratio threshold value under long time delay channel corresponding to CQI grade is less than and the signal-noise ratio threshold value corresponding to CQI grade under non-long time delay channel.Under long time delay channel, select conservative CQI reporting policy, under little time delay channel, select relatively radical CQI reporting policy, by the detailed division to channel scenario, the CQI of often kind of scene is made to report value more accurate, CQI selection strategy feeds back the downlink channel status information status of current UE as far as possible faithfully, ensure that the CQI that terminal is selected under static state or indoor environments is accurate, and be unlikely to too radical at the CQI that outdoor poor channel environments is selected, ensure that the BLER of physical layer under poor channel environments maintains zone of reasonableness, improve the overall performance of link, thus make descending scheduling more reasonable, improve the speed of descending throughput and lifting UE as much as possible.
Second execution mode of the present invention relates to the system of selection of a kind of CQI.Second execution mode is roughly the same with the first execution mode, and main distinction part is: in the first embodiment, adopts the measured value of channel delay to carry out channel differentiation.And in second embodiment of the invention, adopt maximum Doppler expansion to carry out channel differentiation.Adopt maximum Doppler expansion also to can be good at reflecting channel status, thus well can distinguish channel circumstance, feed back rational CQI value.
Similar with delay spread, utilize doppler spread to distinguish channel scenario: doppler spread is comparatively large, think that channel circumstance is comparatively severe, otherwise, think that channel condition is better.Specifically, maximum Doppler expansion is first obtained, as the parameter of reaction channel status; Then channel differentiation is carried out according to maximum Doppler expansion.Specifically, judge whether maximum Doppler expansion is less than or equal to the first expander gate limit value, in this way, then judges that wireless channel is as static channel; As no, then judge whether maximum Doppler expansion is less than or equal to the second expander gate limit value, in this way, then judges that wireless channel is as little time delay channel; As no, then judge that wireless channel is as long time delay channel; Wherein, the second expander gate limit value is greater than the first expander gate limit value; Static channel and little time delay channel are non-long time delay channel.Similar with time delay threshold value, expander gate limit value also can obtain through emulation, relevant with the performance of terminal receiver.
The step of various method divides above, just in order to be described clearly, can merge into a step or splitting some step, being decomposed into multiple step, when realizing as long as comprise identical logical relation, all in the protection range of this patent; To adding inessential amendment in algorithm or in flow process or introducing inessential design, but the core design not changing its algorithm and flow process is all in the protection range of this patent.
Third embodiment of the invention relates to the choice device of a kind of channel quality indication (CQI) information CQI, as shown in Figure 3, comprises: parameter acquisition module, channel region sub-module, CQI determination module and CQI reporting module.
Wherein, parameter acquisition module is for obtaining the parameter of reaction channel status; Such as parameter acquisition module can obtain channel delay Delay measured value, as the parameter of reaction channel status.
The parameter that channel region sub-module is used for obtaining according to acquisition module carries out channel differentiation, wireless channel is divided into long time delay channel and non-long time delay channel.The parameter obtained for parameter acquisition module is for channel delay measured value, and channel region sub-module, when channel delay measured value is less than or equal to the first time delay threshold value, judges that wireless channel is as static channel; Be greater than the first time delay threshold value at channel delay measured value, and when being less than or equal to the second time delay threshold value, judge that wireless channel is as little time delay channel; When channel delay measured value is greater than the second time delay threshold value, judge that wireless channel is as long time delay channel; Wherein, the second time delay threshold value is greater than the first time delay threshold value; Static channel and little time delay channel are non-long time delay channel.
The channel that CQI determination module exports according to channel region sub-module distinguishes result, adopts different CQI reporting policies, selects CQI to report value, reports for CQI reporting module; Wherein, different CQI reporting policies comprises: in same CQI grade, and the signal-noise ratio threshold value under long time delay channel corresponding to CQI grade is less than the signal-noise ratio threshold value under non-long time delay channel corresponding to CQI grade.
Further, CQI determination module comprises following submodule: signal-noise ratio threshold chooses submodule, SINR obtains submodule, CQI chooser module.Signal-noise ratio threshold is chosen submodule and is distinguished result for the channel that exports according to channel region sub-module, chooses channel and distinguishes signal-noise ratio threshold value corresponding to each CQI grade under channel corresponding to result; SINR obtains the Signal to Interference plus Noise Ratio SINR value that submodule is measured for obtaining channel estimating, and adopts EESM method to calculate effective SINR value; CQI chooser module is used for the signal-noise ratio threshold value corresponding to effective SINR value and each CQI grade, selects CQI to report value, reports for CQI reporting module.
Be not difficult to find, present embodiment is the system embodiment corresponding with the first execution mode, and present embodiment can be worked in coordination with the first execution mode and be implemented.The relevant technical details mentioned in first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the first execution mode.
It is worth mentioning that, each module involved in present embodiment is logic module, and in actual applications, a logical block can be a physical location, also can be a part for a physical location, can also realize with the combination of multiple physical location.In addition, in order to outstanding innovative part of the present invention, the unit not too close with solving technical problem relation proposed by the invention is not introduced in present embodiment, but this does not show the unit that there is not other in present embodiment.
Four embodiment of the invention relates to the choice device of a kind of CQI.4th execution mode is roughly the same with the 3rd execution mode, and main distinction part is: in the third embodiment, and parameter acquisition module obtains channel delay measured value, as the parameter of reaction channel status; And channel region sub-module carries out channel differentiation according to channel delay measured value.And in four embodiment of the invention, parameter acquisition module obtains maximum Doppler expansion, as the parameter of reaction channel status; And channel region sub-module carries out channel differentiation according to maximum Doppler expansion.
Specifically, channel region sub-module, when maximum Doppler expansion is less than or equal to the first expander gate limit value, judges that wireless channel is as static channel; Be greater than the first expander gate limit value in maximum Doppler expansion, and when being less than or equal to the second expander gate limit value, judge that wireless channel is as little time delay channel; When maximum Doppler expansion is greater than the second expander gate limit value, judge that wireless channel is as long time delay channel; Wherein, the second expander gate limit value is greater than the first expander gate limit value; Static channel and little time delay channel are non-long time delay channel.
Because the second execution mode and present embodiment are mutually corresponding, therefore present embodiment can be worked in coordination with the second execution mode and be implemented.The relevant technical details mentioned in second execution mode is still effective in the present embodiment, and the technique effect that can reach in this second embodiment can realize in the present embodiment too, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the second execution mode.
Persons of ordinary skill in the art may appreciate that the respective embodiments described above realize specific embodiments of the invention, and in actual applications, various change can be done to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. a system of selection of channel quality indication (CQI) information CQI, is characterized in that, comprises following steps:
S1. the parameter of reaction channel status is obtained;
S2. carry out channel differentiation according to the parameter of described acquisition, wireless channel is divided into long time delay channel and non-long time delay channel;
S3. distinguish result according to different channels, adopt different CQI reporting policies, report; Wherein, described different CQI reporting policy comprises: in same CQI grade, the signal-noise ratio threshold value of the signal-noise ratio threshold value under long time delay channel corresponding to described CQI grade under being less than non-long time delay channel corresponding to described CQI grade.
2. the system of selection of CQI according to claim 1, is characterized in that, in described step S1, obtains channel delay Delay measured value, as the parameter of reaction channel status;
In described step S2, comprise following sub-step:
Judge whether described channel delay measured value is less than or equal to the first time delay threshold value, in this way, then judge that described wireless channel is as static channel; As no, then judge whether described channel delay measured value is less than or equal to the second time delay threshold value, in this way, then judge that described wireless channel is as little time delay channel; As no, then judge that described wireless channel is as long time delay channel; Wherein, described second time delay threshold value is greater than described first time delay threshold value; Described static channel and described little time delay channel are non-long time delay channel.
3. the system of selection of CQI according to claim 2, is characterized in that, in the step obtaining channel delay measured value, obtains the channel delay measured value of multiple descending sub frame;
After the step obtaining channel delay measured value, smoothing to multiple channel delay measured value by following formula, obtain the delay measurements smoothly:
f(n)＝(1-α)·f(n-1)+α·τ
max(n)
f(0)＝τ
max(0)
Wherein, τ
maxn () is the n-th secondary channel delay measurements, f (n) is the n-th secondary channel time delay smooth value, and α is smoothing factor;
In described step S2, according to described level and smooth after channel delay measured value carry out channel differentiation.
4. the system of selection of CQI according to claim 2, is characterized in that, in the step obtaining channel delay measured value, separately carry out if channel delay measurement is two antennas, then the mean value of two antenna measurements got by channel delay measured value.
5. the system of selection of CQI according to claim 1, is characterized in that, in described step S1, obtains maximum Doppler expansion, as the parameter of reaction channel status;
In described step S2, comprise following sub-step:
Judge whether the expansion of described maximum Doppler is less than or equal to the first expander gate limit value, in this way, then judges that described wireless channel is as static channel; As no, then judge whether the expansion of described maximum Doppler is less than or equal to the second expander gate limit value, in this way, then judges that described wireless channel is as little time delay channel; As no, then judge that described wireless channel is as long time delay channel; Wherein, described second expander gate limit value is greater than described first expander gate limit value; Described static channel and described little time delay channel are non-long time delay channel.
6. the system of selection of CQI according to claim 1, is characterized in that, in described step S3, comprises following sub-step:
Distinguish result according to channel, choose described channel and distinguish signal-noise ratio threshold value corresponding to each CQI grade under channel corresponding to result;
Obtain the Signal to Interference plus Noise Ratio SINR value that channel estimating is measured, and adopt index effective SINR mapping method to calculate effective SINR value;
According to the signal-noise ratio threshold value corresponding to described effective SINR value and described each CQI grade, select CQI to report value, report.
7. a choice device of channel quality indication (CQI) information CQI, is characterized in that, comprises: parameter acquisition module, channel region sub-module, CQI determination module and CQI reporting module;
Described parameter acquisition module is for obtaining the parameter of reaction channel status;
The parameter that described channel region sub-module is used for obtaining according to described acquisition module carries out channel differentiation, wireless channel is divided into long time delay channel and non-long time delay channel;
The channel that described CQI determination module exports according to described channel region sub-module distinguishes result, adopts different CQI reporting policies, selects CQI to report value, reports for described CQI reporting module; Wherein, described different CQI reporting policy comprises: in same CQI grade, the signal-noise ratio threshold value of the signal-noise ratio threshold value under long time delay channel corresponding to described CQI grade under being less than non-long time delay channel corresponding to described CQI grade.
8. the choice device of CQI according to claim 7, is characterized in that, described parameter acquisition module obtains channel delay Delay measured value, as the parameter of reaction channel status;
Described channel region sub-module, when described channel delay measured value is less than or equal to the first time delay threshold value, judges that described wireless channel is as static channel; Be greater than the first time delay threshold value at described channel delay measured value, and when being less than or equal to the second time delay threshold value, judge that described wireless channel is as little time delay channel; When described channel delay measured value is greater than the second time delay threshold value, judge that described wireless channel is as long time delay channel; Wherein, described second time delay threshold value is greater than described first time delay threshold value; Described static channel and described little time delay channel are non-long time delay channel.
9. the choice device of CQI according to claim 7, is characterized in that, described parameter acquisition module obtains maximum Doppler expansion, as the parameter of reaction channel status;
Described channel region sub-module, when described maximum Doppler expansion is less than or equal to the first expander gate limit value, judges that described wireless channel is as static channel; Be greater than the first expander gate limit value in described maximum Doppler expansion, and when being less than or equal to the second expander gate limit value, judge that described wireless channel is as little time delay channel; When described maximum Doppler expansion is greater than the second expander gate limit value, judge that described wireless channel is as long time delay channel; Wherein, described second expander gate limit value is greater than described first expander gate limit value; Described static channel and described little time delay channel are non-long time delay channel.
10. the choice device of CQI according to claim 7, is characterized in that, described CQI determination module comprises following submodule: signal-noise ratio threshold chooses submodule, SINR obtains submodule, CQI chooser module;
Described signal-noise ratio threshold is chosen submodule and is distinguished result for the channel exported according to described channel region sub-module, chooses described channel and distinguishes signal-noise ratio threshold value corresponding to each CQI grade under channel corresponding to result;
Described SINR obtains the Signal to Interference plus Noise Ratio SINR value that submodule is measured for obtaining channel estimating, and adopts EESM method to calculate effective SINR value;
Described CQI chooser module is used for the signal-noise ratio threshold value corresponding to described effective SINR value and described each CQI grade, selects CQI to report value, reports for described CQI reporting module.
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