CN102882653A - Channel quality indicator reporting method and user equipment - Google Patents
Channel quality indicator reporting method and user equipment Download PDFInfo
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- CN102882653A CN102882653A CN2012103897541A CN201210389754A CN102882653A CN 102882653 A CN102882653 A CN 102882653A CN 2012103897541 A CN2012103897541 A CN 2012103897541A CN 201210389754 A CN201210389754 A CN 201210389754A CN 102882653 A CN102882653 A CN 102882653A
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Abstract
The invention discloses a channel quality indicator CQI reporting method and user equipment. The method comprises: determining the SNR (Signal Noise Ratio) predicted value of the current moment according to the SNR estimated by the channel at the current moment and the SNR estimated by the channel at a moment before the current moment; obtaining the CQI of the current moment according to the SNR predicted value of the current moment; and reporting the CQI of the current moment to a base station. The CQI reporting method and the user equipment in the embodiment of the invention are used for obtaining and reporting the CQI of the current moment according to the SNR predicted value of the current moment to make the reported CQI be closer to the current actual channel quality so as to guarantee the reported CQI to reflect the fading characteristics of the current channel in time to improve the network performance.
Description
Technical field
The present invention relates to the communications field, and more specifically, relate to method and the subscriber equipment of channel quality index uploading.
Background technology
At high-speed packet access (High-Speed PacketAccess, HSPA) in the network, channel quality indication (channel quality indication, CQI) reporting is high speed downlink packet access (High SpeedDownlink Packet Access, HSDPA) a professional key link, the promptness that CQI reports and accuracy have directly affected the throughput performance of downlink business.Because the CQI assessment needs the certain sample of sampling, and need certain processing time in the realization, bring the delay of realization, can't guarantee that therefore the CQI that reports in time reflects the fading characteristic of current channel, the CQI that namely reports and the channel quality of current reality have deviation.
Summary of the invention
Method and subscriber equipment that the embodiment of the invention provides a kind of CQI to report can guarantee that the CQI that reports in time reflects the fading characteristic of current channel.
First aspect, the method that provides a kind of CQI to report, comprise: according to the signal to noise ratio snr (Signal-to-Noise Ratio, signal to noise ratio) of the channel estimating of current time and the SNR of the channel estimating in the moment before this current moment, determine the SNR predicted value in this current moment; According to the SNR predicted value in this current moment, obtain the CQI in this current moment; The CQI in this current moment is reported the base station.
In the possible implementation of the first, according to the signal to noise ratio snr of the channel estimating of current time and the SNR of the channel estimating in the moment before in this current moment, determine the SNR predicted value in this current moment, specific implementation is: according to the SNR of the channel estimating in this current moment and the SNR of the channel estimating in the moment before this current moment, determine the SNR correction difference in this current moment; According to SNR and the SNR in this current moment correction difference of the channel estimating in this current moment, determine the SNR predicted value in this current moment.
In the possible implementation of the second, in conjunction with the possible implementation of the first of first aspect, according to the SNR of the channel estimating in this current moment and the SNR of the channel estimating in the moment before in this current moment, the SNR that determines this current moment revises difference, and specific implementation is: the SNR that determines this current moment according to following equation revises difference DELTA SNR
i, △ SNR
i=(1-α) * △ SNR
I-1+ α * (SNR
i-SNR
I-1), wherein, △ SNR
I-1For upper one constantly the SNR in this current moment revises difference, SNR
iBe the SNR of the channel estimating in this current moment, SNR
I-1Be upper one constantly the SNR of channel estimating in this current moment, α is the filter factor of SNR difference; According to SNR and the SNR in this current moment correction difference of the channel estimating in this current moment, determine the SNR predicted value in this current moment, specific implementation is: the SNR predicted value SNR that determines this current moment according to following equation
Copm, SNR
Copm=SNR
i+ γ * △ SNR
i, wherein, γ is the weighting penalty coefficient.
In the third possible implementation, the first or the possible implementation of the second in conjunction with first aspect or first aspect, SNR predicted value according to this current moment, obtain the CQI in this current moment, specific implementation is: SNR predicted value that will this current moment corresponding CQI in SNR and CQI mapping table is defined as the CQI in this current moment.
Second aspect provides a kind of subscriber equipment, comprising: determination module is used for determining the SNR predicted value in this current moment according to the signal to noise ratio snr of the channel estimating of current time and the SNR of the channel estimating in the moment before in this current moment; Acquisition module is used for obtaining the CQI in this current moment according to this determination module SNR predicted value in this definite current moment; Sending module, the CQI that is used for this current moment that this acquisition module is obtained reports the base station.
In the possible implementation of the first, this determination module comprises: the first determining unit is used for determining the SNR correction difference in this current moment according to the SNR of the channel estimating in this current moment and the SNR of the channel estimating in the moment before in this current moment; The second determining unit is used for SNR and the SNR in this current moment correction difference according to the channel estimating in this current moment, determines the SNR predicted value in this current moment.
In the possible implementation of the second, in conjunction with the possible implementation of the first of second aspect, this first determining unit specifically is used for, and determines that according to following equation the SNR in this current moment revises difference △ SNR
i, △ SNR
i=(1-α) * △ SNR
I-1+ α * (SNR
i-SNR
I-1), wherein, △ SNR
I-1For upper one constantly the SNR in this current moment revises difference, SNR
iBe the SNR of the channel estimating in this current moment, SNR
I-1Be upper one constantly the SNR of channel estimating in this current moment, α is the filter factor of SNR difference; This second determining unit specifically is used for, and determines the SNR predicted value SNR in this current moment according to following equation
Copm, SNR
Copm=SNR
i+ γ * △ SNR
i, wherein, γ is the weighting penalty coefficient.
In the third possible implementation, the first or the possible implementation of the second in conjunction with second aspect or second aspect, this acquisition module specifically be used for will this current moment the SNR predicted value at the SNR CQI corresponding with the CQI mapping table, be defined as the CQI in this current moment.
Based on technique scheme, the method that the CQI of the embodiment of the invention reports and subscriber equipment, by the SNR according to current time and the channel estimating in the current time moment before, determine the SNR predicted value of current time, obtain the CQI of current time according to the SNR predicted value of current time again and report, can make the CQI that reports more near the channel quality of current reality, thereby can guarantee the in time fading characteristic of the current channel of reflection of the CQI that reports, improve the performance of network.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the below will do to introduce simply to the accompanying drawing of required use in the embodiment of the invention, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the indicative flowchart of the method that reports of the CQI according to the embodiment of the invention.
Fig. 2 is the indicative flowchart according to the method for definite SNR predicted value of the embodiment of the invention.
Fig. 3 is another indicative flowchart of the method that reports of the CQI according to the embodiment of the invention.
Fig. 4 is the schematic diagram according to the realization circuit of the SNR Forecasting Methodology of the embodiment of the invention.
Fig. 5 is the schematic block diagram according to the subscriber equipment of the embodiment of the invention.
Fig. 6 is the schematic block diagram according to the determination module of the embodiment of the invention.
Fig. 7 is the schematic block diagram of subscriber equipment according to another embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work should belong to the scope of protection of the invention.
Should understand, the technical scheme of the embodiment of the invention can be applied to various communication systems, for example: global system for mobile telecommunications (Global System of Mobile communication, referred to as " GSM ") system, code division multiple access (Code Division Multiple Access, referred to as " CDMA ") system, Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access, referred to as " WCDMA ") system, GPRS (General Packet Radio Service, referred to as " GPRS "), Long Term Evolution (Long Term Evolution, referred to as " LTE ") system, LTE Frequency Division Duplexing (FDD) (FrequencyDivision Duplex, referred to as " FDD ") system, LTE time division duplex (Time Division Duplex, referred to as " TDD "), universal mobile telecommunications system (Universal Mobile TelecommunicationSystem, referred to as " UMTS "), the whole world interconnected inserting of microwave (Worldwide Interoperability forMicrowaveAccess is referred to as " WiMAX ") communication system etc.
Will also be understood that, in embodiments of the present invention, subscriber equipment (User Equipment, referred to as " UE ") can be referred to as terminal (Terminal), travelling carriage (Mobile Station, referred to as " MS "), portable terminal (Mobile Terminal) etc., this subscriber equipment can be through wireless access network (Radio AccessNetwork, referred to as " RAN ") communicate with one or more core net, for example, subscriber equipment can be mobile phone (or being called " honeycomb " phone), has the computer of portable terminal etc., for example, subscriber equipment can also be portable, pocket, hand-hold type, built-in computer or vehicle-mounted mobile device, they and wireless access network switched voice and/or data.
In embodiments of the present invention, the base station can be base station (the BaseTransceiver Station among GSM or the CDMA, referred to as " BTS "), also can be the base station (NodeB among the WCDMA, referred to as " NB "), can also be the evolved base station (Evolutional Node B is referred to as " ENB or e-NodeB ") among the LTE, the present invention limit.But for convenience of description, following embodiment will describe as an example of base station ENB and user equipment (UE) example.
Fig. 1 shows the indicative flowchart of the method 100 that the CQI according to the embodiment of the invention reports.The method 100 is carried out by subscriber equipment, and as shown in Figure 1, the method 100 comprises:
S110 according to the signal to noise ratio snr of the channel estimating of current time and the SNR of the channel estimating in the moment before in this current moment, determines the SNR predicted value in this current moment;
S120 according to the SNR predicted value in this current moment, obtains the CQI in this current moment;
S130 reports the base station with the CQI in this current moment.
Owing to SNR calculates the data sample that needs statistics certain, and the time-delay that the receiver processing need to be certain, so CQI reports certain time delay.In order to make the CQI that reports more near the channel quality of current reality, the CQI that assurance reports is the fading characteristic of the current channel of reflection in time, the embodiment of the invention is revised the SNR value by the rule of predicted channel decline, obtains more the SNR predicted value near the fading status of current channel.Subscriber equipment is behind the SNR of the channel estimating that obtains current time by channel estimating, according to the SNR of the channel estimating of current time and the SNR of the channel estimating in the moment before the current time, determine the SNR predicted value of current time, again according to the SNR predicted value of current time, obtain the CQI in this current moment, and CQI that will this current moment reports the base station.Because the SNR predicted value of current time is the result who obtains after according to the variation tendency of SNR the SNR of the channel estimating of current time being revised, therefore, the CQI that obtains according to the SNR predicted value of current time is more near current channel conditions.
Therefore, the method that the CQI of the embodiment of the invention reports, by the SNR according to current time and the channel estimating in the current time moment before, determine the SNR predicted value of current time, obtain the CQI of current time according to the SNR predicted value of current time again and report, can make the CQI that reports more near the channel quality of current reality, thereby can guarantee the in time fading characteristic of the current channel of reflection of the CQI that reports, improve the performance of network.
In embodiments of the present invention, as shown in Figure 2, alternatively, S110 comprises:
S111 according to the SNR of the channel estimating in this current moment and the SNR of the channel estimating in the moment before this current moment, determines the SNR correction difference in this current moment;
S112 according to SNR and the SNR in this current moment correction difference of the channel estimating in this current moment, determines the SNR predicted value in this current moment.
Subscriber equipment calculates the energy of signal and noise by the result of channel estimating, thereby obtains SNR.Behind the SNR of the channel estimating of having obtained current time, subscriber equipment is revised by the SNR to the channel estimating of current time, thereby obtains the SNR predicted value of current time.Subscriber equipment elder generation is according to the SNR of the channel estimating in the moment before current time and the current time, the SNR that determines current time revises difference, revise difference according to the SNR of the channel estimating of current time and the SNR of current time again, determine the SNR predicted value of current time.
Alternatively, S111 comprises:
The SNR that determines this current moment according to following equation revises difference DELTA SNR
i,
△SNR
i=(1-α)*△SNR
i-1+α*(SNR
i-SNR
i-1)（1）
Wherein, Δ SNR
I-1For upper one constantly the SNR in this current moment revises difference, SNR
iBe the SNR of the channel estimating in this current moment, SNR
I-1Be upper one constantly the SNR of channel estimating in this current moment, α is the filter factor of SNR difference;
S 112 comprises:
Determine the SNR predicted value SNR in this current moment according to following equation
Copm,
SNR
copm=SNR
i+γ*△SNR
i （2）
Wherein, γ is the weighting penalty coefficient.
Particularly, subscriber equipment determines that according to equation (1) SNR of current time revises difference DELTA SNR
iΔ SNR
iBy current time and upper SNR difference (SNR constantly
i-SNR
I-1) and upper one constantly SNR revise difference DELTA SNR
I-1Determine, and determine Δ SNR in conjunction with filter coefficient alpha
iValue.Therefore, Δ SNR
iThe variation tendency that has reflected SNR has embodied the rule of channel fading.Subscriber equipment is determined the SNR predicted value SNR of current time again according to equation (2)
CopmSNR
CopmSNR by current time
iWith correction difference △ SNR
iDetermine, and determine SNR in conjunction with weighting penalty coefficient γ
CopmValue, that is to say that subscriber equipment is revised difference DELTA SNR according to the SNR of current time
iTo SNR
iRevise, obtain the SNR predicted value SNR of current time
CopmBecause △ is SNR
iTherefore the variation tendency that has reflected SNR, considers the existence of time-delay, by △ SNR
iThe predicted value SNR that correction obtains
CopmMore can reflect current channel conditions.
Alternatively, factor alpha and γ can adjust according to the variation speed situation of channel, obtain the more accurately purpose of predicted value to reach self adaptation.
Like this, the method that the CQI of the embodiment of the invention reports, by the SNR according to current time and the channel estimating in the current time moment before, the SNR that determines current time revises difference, and then by the SNR predicted value of revising the difference correction and obtain current time, obtain the CQI of current time according to the SNR predicted value of current time again and report, can make the CQI that reports more near the channel quality of current reality, thereby can guarantee that the CQI that reports in time reflects the fading characteristic of current channel, improves the performance of network.
In S 120, subscriber equipment obtains the CQI in this current moment according to the SNR predicted value in this current moment.
After obtaining the SNR predicted value of current time, subscriber equipment obtains the CQI of current time according to the SNR predicted value of current time, rather than directly obtains CQI by the SNR of channel estimating.Alternatively, subscriber equipment carries out CQI according to the SNR predicted value in the front moment tables look-up, and obtains the CQI of current time, that is to say, with the SNR predicted value in this current moment corresponding CQI in SNR and CQI mapping table, is defined as the CQI in this current moment.
In S 130, the CQI that subscriber equipment will this current moment reports the base station.
The CQI of the current time that subscriber equipment will be obtained by the SNR predicted value of current time reports the base station.Obtain because the SNR predicted value of current time is the variation tendency correction according to SNR, therefore, consider the existence of time-delay, the CQI that is obtained by the SNR predicted value of current time is more near current channel conditions.
Example below in conjunction with shown in Figure 3 is described the embodiment of the invention.
S301, channel estimating.Subscriber equipment carries out channel estimating according to downlink reference signal.
S302, Signal estimation.Subscriber equipment calculates the energy of signal according to the result of channel estimating.
S303, noise is estimated.Subscriber equipment calculates the energy of noise according to the result of channel estimating.
S304, SNR calculates.According to the energy of the signal that calculates among S302 and the S303 and noise, the subscriber devices compute signal to noise ratio snr.
S305, the SNR prediction.Subscriber equipment obtains the SNR predicted value that meets the SNR variation tendency according to the SNR that channel estimating obtains.For example, determine the predicted value of SNR according to equation (1) and (2).
S306, CQI tables look-up.Subscriber equipment carries out CQI and tables look-up according to the SNR predicted value that obtains among the S305, obtains CQI.
S307, CQI reports.Subscriber equipment reports the base station with the CQI that obtains among the S306.
Fig. 4 is the schematic diagram of realization circuit of the SNR Forecasting Methodology of the embodiment of the invention.It should be noted that Fig. 4 is an example of realizing circuit of the embodiment of the invention, and the scope of the unrestricted embodiment of the invention.In Fig. 4, delayer 401 and 402 pairs upper one data samples constantly latch.At current time (i constantly), delayer 401 outputs upper are the signal to noise ratio snr of (i-1 constantly) constantly
I-1, the signal to noise ratio snr of current time
iSignal to noise ratio snr with a upper moment
I-1After process subtracter 403 subtracts each other, pass through multiplier 405 filtering, multiplier 405 is output as α * (SNR again
i-SNR
I-1); Delayer 402 output upper one SNR constantly revise difference DELTA SNR
I-1, Δ SNR
I-1Through output (1-α) * Δ SNR after multiplier 404 filtering
I-1The output of multiplier 404 (1-α) * Δ SNR
I-1Output α * (SNR with multiplier 405
i-SNR
I-1) addition in adder 406, the SNR that obtains current time revises difference DELTA SNR
i, Δ SNR
iThrough obtaining γ * △ SNR after multiplier 407 weightings
iThe SNR of current time
iOutput γ * Δ SNR with multiplier 407
iThrough obtaining the SNR predicted value SNR of current time after adder 408 additions
Copm
Therefore, the method that the CQI of the embodiment of the invention reports, by the SNR according to current time and the channel estimating in the current time moment before, determine the SNR predicted value of current time, obtain the CQI of current time according to the SNR predicted value of current time again and report, can make the CQI that reports more near the channel quality of current reality, thereby can guarantee the in time fading characteristic of the current channel of reflection of the CQI that reports, improve the performance of network.
Above in conjunction with Fig. 1 to Fig. 4, describe the method that the CQI according to the embodiment of the invention reports in detail, below in conjunction with Fig. 5 to Fig. 7, the subscriber equipment according to the embodiment of the invention is described.
Fig. 5 shows the schematic block diagram according to the subscriber equipment 500 of the embodiment of the invention.As shown in Figure 5, this subscriber equipment 500 comprises:
Determination module 510 is used for determining the SNR predicted value in this current moment according to the signal to noise ratio snr of the channel estimating of current time and the SNR of the channel estimating in the moment before in this current moment;
Sending module 530, the CQI that is used for this current moment that this acquisition module 520 is obtained reports the base station.
The subscriber equipment of the embodiment of the invention, by the SNR according to current time and the channel estimating in the current time moment before, determine the SNR predicted value of current time, obtain the CQI of current time according to the SNR predicted value of current time again and report, can make the CQI that reports more near the channel quality of current reality, thereby can guarantee that the CQI that reports in time reflects the fading characteristic of current channel, improves the performance of network.
In embodiments of the present invention, as shown in Figure 6, alternatively, this determination module 510 comprises:
The first determining unit 511 is used for determining the SNR correction difference in this current moment according to the SNR of the channel estimating in this current moment and the SNR of the channel estimating in the moment before in this current moment;
The second determining unit 512 is used for SNR and the SNR in this current moment correction difference according to the channel estimating in this current moment, determines the SNR predicted value in this current moment.
Alternatively, this first determining unit 511 specifically is used for, and determines that according to following equation the SNR in this current moment revises difference DELTA SNR
i,
△SNR
i=(1-α)*△SNR
i-1+α*(SNR
i-SNR
i-1)，
Wherein, Δ SNR
I-1For upper one constantly the SNR in this current moment revises difference, SNR
iBe the SNR of the channel estimating in this current moment, SNR
I-1Be upper one constantly the SNR of channel estimating in this current moment, α is the filter factor of SNR difference;
This second determining unit 512 specifically is used for, and determines the SNR predicted value SNR in this current moment according to following equation
Copm,
SNR
copm=SNR
i+γ*△SNR
i，
Wherein, γ is the weighting penalty coefficient.
The subscriber equipment of the embodiment of the invention, by the SNR according to current time and the channel estimating in the current time moment before, the SNR that determines current time revises difference, and then by the SNR predicted value of revising the difference correction and obtain current time, obtain the CQI of current time according to the SNR predicted value of current time again and report, can make the CQI that reports more near the channel quality of current reality, thereby can guarantee that the CQI that reports in time reflects the fading characteristic of current channel, improves the performance of network.
In embodiments of the present invention, alternatively, this acquisition module 520 is concrete be used for will this current moment the SNR predicted value at the SNR CQI corresponding with the CQI mapping table, be defined as the CQI in this current moment.
Subscriber equipment in the method that can report corresponding to the CQI according to the embodiment of the invention according to the subscriber equipment 500 of the embodiment of the invention, and above-mentioned and other operation of the modules in the subscriber equipment 500 and/or function are respectively in order to realize the corresponding flow process of each method among Fig. 1 to Fig. 4, for simplicity, do not repeat them here.
The subscriber equipment of the embodiment of the invention, by the SNR according to current time and the channel estimating in the current time moment before, determine the SNR predicted value of current time, obtain the CQI of current time according to the SNR predicted value of current time again and report, can make the CQI that reports more near the channel quality of current reality, thereby can guarantee that the CQI that reports in time reflects the fading characteristic of current channel, improves the performance of network.
Fig. 7 shows the according to another embodiment of the present invention schematic block diagram of subscriber equipment 700.As shown in Figure 7, this subscriber equipment 700 comprises:
The subscriber equipment of the embodiment of the invention, by the SNR according to current time and the channel estimating in the current time moment before, determine the SNR predicted value of current time, obtain the CQI of current time according to the SNR predicted value of current time again and report, can make the CQI that reports more near the channel quality of current reality, thereby can guarantee that the CQI that reports in time reflects the fading characteristic of current channel, improves the performance of network.
Alternatively, this processor 710 specifically is used for according to the SNR of the channel estimating in this current moment and the SNR of the channel estimating in the moment before this current moment, determines the SNR correction difference in this current moment; According to SNR and the SNR in this current moment correction difference of the channel estimating in this current moment, determine the SNR predicted value in this current moment.
Alternatively, this processor 710 specifically is used for, and determines that according to following equation the SNR in this current moment revises difference DELTA SNR
i,
△SNR
i=(1-α)*△SNR
i-1+α*(SNR
i-SNR
i-1)，
Wherein, △ SNR
I-1For upper one constantly the SNR in this current moment revises difference, SNR
iBe the SNR of the channel estimating in this current moment, SNR
I-1Be upper one constantly the SNR of channel estimating in this current moment, α is the filter factor of SNR difference;
This processor 710 specifically is used for, and determines the SNR predicted value SNR in this current moment according to following equation
Copm,
SNR
copm=SNR
i+γ*△SNR
i，
Wherein, γ is the weighting penalty coefficient.
The subscriber equipment of the embodiment of the invention, by the SNR according to current time and the channel estimating in the current time moment before, the SNR that determines current time revises difference, and then by the SNR predicted value of revising the difference correction and obtain current time, obtain the CQI of current time according to the SNR predicted value of current time again and report, can make the CQI that reports more near the channel quality of current reality, thereby can guarantee that the CQI that reports in time reflects the fading characteristic of current channel, improves the performance of network.
Alternatively, this processor 710 is concrete be used for will this current moment the SNR predicted value at the SNR CQI corresponding with the CQI mapping table, be defined as the CQI in this current moment.
Subscriber equipment in the method that can report corresponding to the CQI according to the embodiment of the invention according to the subscriber equipment 700 of the embodiment of the invention, and above-mentioned and other operation of the modules in the subscriber equipment 700 and/or function are respectively in order to realize the corresponding flow process of each method among Fig. 1 to Fig. 4, for simplicity, do not repeat them here.
The subscriber equipment of the embodiment of the invention, by the SNR according to current time and the channel estimating in the current time moment before, determine the SNR predicted value of current time, obtain the CQI of current time according to the SNR predicted value of current time again and report, can make the CQI that reports more near the channel quality of current reality, thereby can guarantee that the CQI that reports in time reflects the fading characteristic of current channel, improves the performance of network.
Should be understood that in embodiments of the present invention, term " and/or " only be a kind of incidence relation of describing affiliated partner, can there be three kinds of relations in expression.For example, A and/or B can represent: individualism A exists A and B, these three kinds of situations of individualism B simultaneously.In addition, character "/" represents that generally forward-backward correlation is to liking a kind of relation of "or" herein.
Those of ordinary skills can recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software clearly is described, composition and the step of each example described in general manner according to function in the above description.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.The professional and technical personnel can specifically should be used for realizing described function with distinct methods to each, but this realization should not thought and exceeds scope of the present invention.
The those skilled in the art can be well understood to, and for the convenience described and succinct, the specific works process of the system of foregoing description, device and unit can with reference to the corresponding process among the preceding method embodiment, not repeat them here.
In several embodiment that the application provides, should be understood that disclosed system, apparatus and method can realize by another way.For example, device embodiment described above only is schematic, for example, the division of described unit, only be that a kind of logic function is divided, during actual the realization other dividing mode can be arranged, for example a plurality of unit or assembly can in conjunction with or can be integrated into another system, or some features can ignore, or do not carry out.In addition, the shown or coupling each other discussed or direct-coupling or communication connection can be indirect coupling or the communication connections by some interfaces, device or unit, also can be electric, machinery or other form connect.
Described unit as separating component explanation can or can not be physically to separate also, and the parts that show as the unit can be or can not be physical locations also, namely can be positioned at a place, perhaps also can be distributed on a plurality of network element.Can select according to the actual needs wherein some or all of unit to realize the purpose of embodiment of the invention scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in the processing unit, also can be that the independent physics of unit exists, and also can be that two or more unit are integrated in the unit.Above-mentioned integrated unit both can adopt the form of hardware to realize, also can adopt the form of SFU software functional unit to realize.
If described integrated unit is realized with the form of SFU software functional unit and during as independently production marketing or use, can be stored in the computer read/write memory medium.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words, perhaps all or part of of this technical scheme can embody with the form of software product, this computer software product is stored in the storage medium, comprise that some instructions are with so that a computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out all or part of step of the described method of each embodiment of the present invention.And aforesaid storage medium comprises: the various media that can be program code stored such as USB flash disk, portable hard drive, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD.
The above; it only is the specific embodiment of the present invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily modification or the replacement of various equivalences, these modifications or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (8)
1. the method that channel quality indicator (CQI) reports is characterized in that, comprising:
According to the signal to noise ratio snr of the channel estimating of current time and the SNR of the channel estimating in the moment before the described current time, determine the SNR predicted value of described current time;
According to the SNR predicted value of described current time, obtain the CQI of described current time;
The CQI of described current time is reported the base station.
2. method according to claim 1 is characterized in that, the signal to noise ratio snr of described channel estimating according to current time and the SNR of the channel estimating in the moment before the described current time determine to comprise the SNR predicted value of described current time:
According to the SNR of the channel estimating of described current time and the SNR of the channel estimating in the moment before the described current time, determine that the SNR of described current time revises difference;
Revise difference according to the SNR of the channel estimating of described current time and the SNR of described current time, determine the SNR predicted value of described current time.
3. method according to claim 2 is characterized in that, the SNR of described channel estimating according to described current time and the SNR of the channel estimating in the moment before the described current time determine that the SNR of described current time revises difference, comprising:
Determine that according to following equation the SNR of described current time revises difference △ SNRi,
△SNR
i=(1-α)*ΔSNR
i-1+α*(SNR
i-SNR
i-1)，
Wherein, △ SNR
I-1For upper one constantly SNR of described current time revises difference, SNR
iBe the SNR of the channel estimating of described current time, SNR
I-1Be upper one constantly the SNR of channel estimating of described current time, α is the filter factor of SNR difference;
The SNR of described channel estimating according to described current time and the SNR of described current time revise difference, determine the SNR predicted value of described current time, comprising:
Determine the SNR predicted value SNR of described current time according to following equation
Copm,
SNR
copm=SNR
i+γ*△SNR
i，
Wherein, γ is the weighting penalty coefficient.
4. each described method in 3 according to claim 1 is characterized in that, described SNR predicted value according to described current time is obtained the CQI of described current time, comprising:
With the SNR predicted value of described current time corresponding CQI in SNR and CQI mapping table, be defined as the CQI of described current time.
5. a subscriber equipment is characterized in that, comprising:
Determination module is used for determining the SNR predicted value of described current time according to the signal to noise ratio snr of the channel estimating of current time and the SNR of the channel estimating in the moment before the described current time;
Acquisition module is used for the SNR predicted value according to the definite described current time of described determination module, obtains the CQI of described current time;
Sending module, the CQI that is used for described current time that described acquisition module is obtained reports the base station.
6. subscriber equipment according to claim 5 is characterized in that, described determination module comprises:
The first determining unit is used for determining that according to the SNR of the channel estimating of described current time and the SNR of the channel estimating in the moment before the described current time SNR of described current time revises difference;
The second determining unit is used for revising difference according to the SNR of the channel estimating of described current time and the SNR of described current time, determines the SNR predicted value of described current time.
7. subscriber equipment according to claim 6 is characterized in that, described the first determining unit specifically is used for, and determines that according to following equation the SNR of described current time revises difference △ SNR
i,
△SNR
i=(1-α)*△SNR
i-1+α*(SNR
i-SNR
i-1)，
Wherein, △ SNR
I-1For upper one constantly SNR of described current time revises difference, SNR
iBe the SNR of the channel estimating of described current time, SNR
I-1Be upper one constantly the SNR of channel estimating of described current time, α is the filter factor of SNR difference;
Described the second determining unit specifically is used for, and determines the SNR predicted value SNR of described current time according to following equation
Copm,
SNR
copm=SNR
i+γ*△SNR
i，
Wherein, γ is the weighting penalty coefficient.
8. each described subscriber equipment in 7 according to claim 5 is characterized in that, described acquisition module specifically is used for SNR predicted value with described current time at the SNR CQI corresponding with the CQI mapping table, is defined as the CQI of described current time.
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