CN101448284A - Method and system for constructing channel quality indicator tables for feedback in a communication system - Google Patents

Method and system for constructing channel quality indicator tables for feedback in a communication system Download PDF

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CN101448284A
CN101448284A CNA2008101798371A CN200810179837A CN101448284A CN 101448284 A CN101448284 A CN 101448284A CN A2008101798371 A CNA2008101798371 A CN A2008101798371A CN 200810179837 A CN200810179837 A CN 200810179837A CN 101448284 A CN101448284 A CN 101448284A
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channel quality
base station
cqi
signal
modulation
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马克·肯特
巴中·申
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Broadcom Corp
Zyray Wireless Inc
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Zyray Wireless Inc
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Abstract

The present invention provides a method and system for constructing channel quality indicator tables for feedback in a communication system. A user terminal may receive a signal transmitted by using a modulation and coding scheme (MCS) from a base station. The user terminal may assess channel quality information by accessing a CQI table to identify a CQI value based on the received radio signal. The CQI table may comprise various modulation regions in terms of spectral efficiency. The identified CQI value may be transmitted to the base station. Various standard system protocols such 3GPP, 3GPP LTE, or WiMAX, may be used for transmissions. The CQI table may be generated via PER versus spectral efficiency and/or SNR, respectively. The base station may select a MCS based on the CQI feedback from the user terminal for transmitting a subsequent radio signal to the user terminal.

Description

Feedback in the communication system is set up the method and system of channel quality indicator table
Technical field
The present invention relates to the signal processing of communication system, more particularly, relate to a kind of method and system of feedback in the communication system being set up the channel quality indicator table.
Background technology
Advanced wireless communication system such as the third generation (3G) system and other system adopts various correlation techniques usually, and for example Adaptive Modulation and Coding (AMC) technology improves data throughout and signal transmission quality.The AMC technology is generally used for the high-speed packet transmission and according to the variation that takes place in the transmission medium modulator approach and encoding rate is carried out the self adaptation adjusting.The utilization of AMC technology be to instantaneous channel conditions such as path loss and shadow effect, interference variations, and the estimation result of multipath fading.Instantaneous channel quality conditions is normally measured by different subscriber equipment (UE), such as, mobile phone, described instantaneous channel quality conditions extensively is called channel quality indicator (Channel Quality Indicator is abbreviated as CQI).The CQI information that measures by the physical layer signal mode by the respective transmitter place that is sent to such as this type of wireless receiver of mobile phone such as the base station.The base station is according to the CQI Information Selection MCS that receives and utilize selected MCS that downlink packet data is transmitted.
Compare the follow-up system that will introduce in conjunction with the accompanying drawings of the present invention, other limitation of prior art and drawback are conspicuous for the person of ordinary skill of the art.
Summary of the invention
The invention provides the method and system of the feedback in the communication system being set up the channel quality indicator table, carried out representing fully and describing in conjunction with at least one width of cloth accompanying drawing, and obtained more complete elaboration in the claims.
The present invention proposes a kind of wireless communication method, comprising:
Receive radio signals from the base station by user terminal, wherein, described radio signal utilizes first Modulation and Coding Scheme (MCS) to transmit;
Channel quality information is sent to described base station from described user terminal, wherein, described channel quality information is to determine that based on described radio signal that receives and channel quality indicator (CQI) table that comprises a plurality of modulation wave bands described a plurality of modulation wave bands distribute by spectrum efficiency by described user terminal.
Preferably, described radio signal comprises in the following signal one: 3GPP signal, 3GPP Long Term Evolution (LTE) signal and WiMAX signal.
Preferably, described channel quality information is channel quality indicator (CQI) value.
Preferably, described a plurality of modulation wave band comprises multiple Modulation and Coding Scheme (MCS).
Preferably, described modulation wave band is included in the high order modulation wave band that is better than the low-order-modulated wave band on spectrum efficiency and/or the signal to noise ratio (snr).
Preferably, described base station generates and/or upgrades described channel quality indicator (CQI) and show.
Preferably, channel quality indicator (CQI) table of described base station after with described renewal sends described user terminal to.
Preferably, described a plurality of modulation wave band is determined based on the estimated value as the Packet Error Ratio (PER) of the function of signal to noise ratio (snr) in described base station.
Preferably, described base station is based on the estimated value as the Packet Error Ratio (PER) of the function of spectrum efficiency is determined described a plurality of modulation wave band.
Preferably, described a plurality of modulation wave band is determined based on the estimation that described definite channel quality information is carried out in described base station.
Preferably, described a plurality of modulation wave band is determined based on the user terminal capacity in described base station.
Preferably, described method further comprises: receive follow-up radio signal by described user terminal from described base station, wherein, described follow-up radio signal adopts by described base station according to described definite channel quality information and the second definite Modulation and Coding Scheme transmits.
The present invention also proposes a kind of wireless telecommunication system, comprising:
Be used for one or more circuit of receiving radio signals from the base station by user terminal, wherein, described radio signal utilizes first Modulation and Coding Scheme (MCS) to transmit;
Described one or more circuit is sent to described base station with channel quality information from described user terminal, wherein, described channel quality information is to determine that based on described radio signal that receives and channel quality indicator (CQI) table that comprises a plurality of modulation wave bands described a plurality of modulation wave bands distribute by spectrum efficiency by described user terminal.
Preferably, described radio signal comprises in the following signal one: 3GPP signal, 3GPP Long Term Evolution (LTE) signal and WiMAX signal.
Preferably, described channel quality information is channel quality indicator (CQI) value.
Preferably, described a plurality of modulation wave band comprises multiple Modulation and Coding Scheme (MCS).
Preferably, described modulation wave band is included in the high order modulation wave band that is better than the low-order-modulated wave band on spectrum efficiency and/or the signal to noise ratio (snr).
Preferably, described base station generates and/or upgrades described channel quality indicator (CQI) and show.
Preferably, channel quality indicator (CQI) table of described base station after with described renewal sends described user terminal to.
Preferably, preferably, described a plurality of modulation wave band is determined based on the estimated value as the Packet Error Ratio (PER) of the function of signal to noise ratio (snr) in described base station.
Preferably, described base station is based on the estimated value as the Packet Error Ratio (PER) of the function of spectrum efficiency is determined described a plurality of modulation wave band.
Preferably, described a plurality of modulation wave band is determined based on the estimation that described definite channel quality information is carried out in described base station.
Preferably, described one or more circuit also is used for receiving follow-up radio signal by described user terminal from described base station, wherein, described follow-up radio signal adopts by described base station according to described definite channel quality information and the second definite Modulation and Coding Scheme transmits.
Various advantage of the present invention, various aspects and character of innovation, and the details of the embodiment of example shown in it will describe in detail in following description and accompanying drawing.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the structured flowchart that adopts the communication system of the channel quality indicator table that makes up in one embodiment of the invention;
Fig. 2 is the schematic diagram of the constructed CQI tableau format of one embodiment of the invention;
Fig. 3 is the schematic diagram of modulation wave band of the CQI table of structure that one embodiment of the invention is set up;
Fig. 4 is a schematic diagram of determining the modulation wave band crosspoint that the CQI of structure shows according to one embodiment of the invention;
Fig. 5 is the flow chart of steps of the generation CQI table clause of one embodiment of the invention.
Embodiment
Some embodiments of the present invention relate to the method and system of the feedback in the communication system being set up the channel quality indicator table.Concrete aspect of the present invention relates to user terminal and can receive and carry out radio signals transmitted from the base station with a kind of Modulation and Coding Scheme (MCS).The signal to noise ratio (snr) of the radio signal that described user terminal can receive by calculating and obtain channel quality indicator (CQI) table based on the SNR that calculates and obtain channel quality information so that the CQI value discerned.Described CQI table comprises a plurality of modulation wave bands based on spectrum efficiency.Can demonstrate exclusive MCS in the modulation wave band of corresponding given spectrum efficiency through the CQI value that identification draws.The described CQI value that identifies will be sent to the base station with the form of CQI message or CQI report.In communication system, often can adopt the multiple standards system protocol to support the CQI characteristic, such as, 3GPP, 3GPP LTE or WiMAX.Each modulation wave band in the CQI table all comprises the different Modulation and Coding Scheme of a plurality of spectrum efficiencies (MCS).For the high order modulation wave band, it will be better than the low-order-modulated wave band aspect spectrum efficiency and/or the SNR.The CQI table can upgrade upgrading by the base station generation and/or by the base station, and can be sent to user terminal.CQI table can be by relatively generating respectively PER and spectrum efficiency and/or SNR.The CQI table can be based on determining from the CQI feedback of user terminal and/or the capacity of user terminal.In addition, based on from the CQI of subscriber equipment feedback, the base station can to radio-signal source distribution adjust, select MCS, and utilize selected MCS to send follow-up radio signal to subscriber equipment.
Fig. 1 is the structured flowchart that adopts the communication system of the channel quality indicator table that makes up in one embodiment of the invention.As shown in the figure, base station shown in the figure 110, subscriber equipment (UE) 120, a plurality of CQI table 130a～130n that generate by base station (BS) 110, and the CQI table 130j that is used for the CQI report by subscriber equipment 120.Base station 110 comprises base station transceiver 110a, base station processor 110b and base station stored device 110c.Subscriber equipment 120 comprises user equipment transceiver 120a, subscriber equipment processor 120b and user device memory 120c.
Base station 110 comprises suitable logical device, circuit and/or code, can connect on the standard air interface such as 3GPP Long Term Evolution (LTE) or communication, distributes air interface resource and arrange and safeguard by these logical devices, circuit and/or code.Base station 110 can be by base station transceiver 110a to receiving such as the radiofrequency signal of subscriber equipment 120 from a plurality of subscriber equipmenies and/or radiofrequency signal being sent to a plurality of subscriber equipmenies.Base station 110 can generate a plurality of channel quality indicator (CQI) table 130a～130n that are used to improve data throughout and signal transmission quality, and can safeguard these tables.One or more CQI tables can be selected in base station 110, show 130j such as CQI, and selected CQI table is distributed to subscriber equipment 120 in calling setting or data transfer procedure.Subscriber equipment 120 is used CQI table 130j and is provided channel-quality feedback for base station 110.Base station 110 can generate CQI table 130a～130n and the CQI table is carried out periodicmaintenance with Fixed Time Interval, for example, according to the time, perhaps various trigger events or definite condition is irregularly responded.Therefore, the generation of CQI table 130a～130n and maintenance be based on the up-to-date data that receive carry out, for example, from the CQI feedback that base station 110 provides of passing through of one or more subscriber equipmenies.
Base station 110 can utilize multiple mode to generate CQI table 130a～130n.Therefore, the generation of CQI table 130a～130n is based on spectrum efficiency (S Eff) and/or signal to noise ratio (snr) show and carry out.Spectrum efficiency (S Eff) determine that mode is as follows:
S Eff=encoding rate * order of modulation,
Frequency spectrum S EffCharacterized the bit number of each modulation symbol.The distribution of radio frequency resource can be carried out based on the user data deposit and from the CQI feedback that subscriber equipment 120 receives in base station 110 in the middle of a plurality of subscriber equipmenies.From the various CQI feedbacks of one or more subscriber equipmenies such as subscriber equipment 120, can reflect the moment downlink radio frequency channel condition of subscriber equipment 120, and can point out the next downlink packet data that will be transferred to subscriber equipment 120 is recommended the Modulation and Coding Scheme (MCS) that adopts.Base station 110 need not carried out according to the MCS that recommends the CQI feedback that receives from subscriber equipment 120.Yet based on the CQI feedback that receives from subscriber equipment 120, base station 110 can be adjusted, select MCS and utilize selected MCS that downlink packet data is sent to subscriber equipment 120 distribution of radio resource.
Transceiver 110a can comprise suitable logical device, circuit and/or code, and these logical devices, circuit and/or code can be according to radio-frequency technique and/or radio frequency standard, and for example LTE generates RF signal and/or intermediate frequency (IF) signal from base band.Transceiver 110a can be sent to base station processor 110b with described baseband signal.
Base station processor 110b can comprise suitable logical device, circuit and/or code, and these logical devices, circuit and/or code can carry out various signal processing tasks and comprise base station transceiver 110a is controlled.But the various advanced algorithm of base station processor 110b application memory in base station stored device 110c planned and/or change management.It is that subscriber equipment 120 is selected a specific CQI table that base station processor 110b can adopt multiple algorithms of different.The selection of CQI table 130j is based on various different factors and definite, such as the capacity of subscriber equipment 120.
Subscriber equipment 120 can comprise suitable logical device, circuit and/or code, these logical devices, circuit and/or code can by user equipment transceiver 1120a from the base station 110 received RF signals, and/or radiofrequency signal sent to base station 110.User equipment transceiver 120a can comprise suitable logical device, circuit and/or code, these logical devices, circuit and/or code can be always in the baseband signal of user's device handler 120b according to radio-frequency technique and/or standard for example LTE generate radiofrequency signal and intermediate frequency (IF) signal.Subscriber equipment processor 120b can comprise suitable logical device, circuit and/or code, and these logical devices, circuit and/or code can be carried out multiple signal processing tasks and comprise user equipment transceiver 120a is controlled.But the various advanced algorithm of subscriber equipment processor 120b application memory in user device memory 120c carried out various tasks, such as base band signal process.
User device memory 120c can comprise suitable logical device, circuit and/or code, and these logical devices, circuit and/or code can be stored the data and/or the code of subscriber equipment processor 120b and/or user equipment transceiver 120a use.Subscriber equipment 120 can offer base station 110 with channel quality information based on the measurement result to the signal to noise ratio (snr) of the down link signal that receives.Described calculating to SNR is carried out in subscriber equipment processor 120b.Described channel quality information can CQI information form exist, this information is sent to base station 110 from subscriber equipment 120.Subscriber equipment 120 can be based on the described SNR that calculates by reading and the identification of at least one CQI value among the CQI table 130j generated described CQI information CQI table 130j.CQI table 130j can send subscriber equipment 120 to and be stored in the user device memory 120c from base station 110.Therefore, CQI table 130j normally sets up based on spectrum efficiency and/or SNR in base station 110.The CQI table can be expressed as { modulation, encoding rate } such as the clauses and subclauses in the CQI table 130j at each CQI value.Subscriber equipment 120 can be sent to base station 110 by transceiver 120a with the CQI value that recognizes.The CQI value that identifies has reflected instantaneous down link radio-frequency channel condition, and can indicate that to be fit to modulation-encoding rate of using base station 110 right.The use of CQI table 130j can make base station 110 more reliably and accurately the required radio frequency resource of the downlink transmission that transfers to subscriber equipment 120 be distributed more accurately.
Be in operation, subscriber equipment 120 can be from the base station 110 respectively by base station transceiver 110a and user equipment transceiver 120a received signal.Subscriber equipment processor 120b can handle wherein each kind of signal.For example, subscriber equipment processor 120b can calculate the SNR of the down link signal that receives and can identify a CQI value by reading the CQI table 130j that is stored among the memory 120c to the SNR that calculates.Base station 110 can generate and safeguard a plurality of CQI table 130a～130n.The foundation of described a plurality of CQI table 130a～130n is based on that spectrum efficiency and/or SNR finish with generating.One or more among a plurality of CQI table 130a～130n of described generation such as CQI table 130j, are assigned to a concrete subscriber equipment, such as subscriber equipment 120.Described selected CQI table 130j can be from the base station 110 be sent to subscriber equipment 120 or directly be sent to subscriber equipment 120.It is right that clauses and subclauses in the CQI table 130j can be represented the modulation-encoding rate of each CQI value.Subscriber equipment 120 can identify a CQI value to each downlink transmission that receives from base station 110 from CQI table 130j.Subscriber equipment 120 can generate CQI message or the CQI report that includes the described CQI value that identifies, and described CQI message or report are transferred to base station 110.Based on the CQI value that identifies that receives, distribution, the selection MCS of radio resource can be adjusted in base station 110, and the MCS that The data is selected is transferred to subscriber equipment 120.
Fig. 2 is the constructed CQI tableau format schematic diagram of one embodiment of the invention.As shown in the figure, the table 130 of CQI shown in the figure comprises: CQI field 130a, code rate field 130b, order of modulation field 130c and spectrum efficiency field 130d.Each different field in the CQI table 130 further is divided into three modulation wave bands again: QPSK wave band, 16QAM wave band and 64QAM wave band.The various parameters that are used to describe CQI table 130 see Table 1.
Seff_min The minimal frequency efficient that is used for the CQI report
Seff_max_qpsk The maximum spectral efficiency that is used for the QPSK operation
Seff_max_16qam The maximum spectral efficiency that is used for the 16QAM operation
Rmax The maximum encoding rate that is used for the 64QAM operation
Δ1 Guarantee that 16QAM operation wave band is better than the transition parameter of QPSK wave band
Δ2 Guarantee that 64QAM operation wave band is better than the transition parameter of 16QAM wave band
Table 1.CQI wave band parameter
As shown in table 1, what parameter S eff_min represented is that the I that is used at subscriber equipment 120 places CQI information being reported is accepted spectrum efficiency.What parameter S eff_max_qpsk and Seff_max_16qam represented respectively is the maximum spectral efficiency of QPSK or 16QAM operation.Parameter Δ 1 and Δ 2 are to be used to guarantee that the high order modulation wave band is better than the transition parameter of low-order-modulated wave band.For example, parameter Δ 1 can guarantee that 16QAM wave band 134 is better than QPSK wave band 132.Parameter Δ 2 is used to guarantee that 64QAM wave band 136 is better than 16QAM wave band 134.
CQI field 130a is used to the channel quality information of subscriber equipment 120 that measures of quantization is provided.CQI field 130a can comprise the different integers between 0 to 30.If value is 0, then explanation goes beyond the scope.The CQI value is based on that the SNR value calculated obtains, for example the SNR value at subscriber equipment 120 places.Exclusive encoding rate-modulation type that each CQI value among the CQI field 130a all is characterized under the given spectrum efficiency is right.
Code rate field 130b comprises various encoding rates, for example, is used for carrying out to subscriber equipment 120 encoding rate 0.55 and 0.62 of downlink transmission by base station 110.Order of modulation field 130c represents the bit number of each modulation symbol.For example, the order of modulation among the order of modulation field 130c 2,4 and 6 is represented QPSK, 16QAM and 64QAM modulation type respectively.
Spectrum efficiency field 130d can provide subscriber equipment 120 places obtainable spectrum efficiency information.Each clauses and subclauses in the described spectrum efficiency field 130d obtain by encoding rate and order of modulation are multiplied each other.
Three kinds of modulation wave bands in the described CQI table 130, promptly QPSK wave band 132,16QAM wave band 134 and 64QAM wave band 136 define according to spectrum efficiency and modulation type.CQI table clause in the CQI table in each wave band is expressed as follows:
{ encoding rate, order of modulation }
The CQI table clause is relevant with spectrum efficiency (Seff) and SNR, and physical relationship is expressed as follows:
Seff=encoding rate * order of modulation
Seff＝log 2(1+SNR)
Marker space between wave band and the wave band is exactly to go up the zone that the high order modulation wave band is better than the low-order-modulated wave band in the error rate (PER).
Fig. 3 is the modulation wave band schematic diagram that the CQI of the structure of one embodiment of the invention shows.As shown in the figure, QPSK wave band 132,16QAM wave band 134 and 64QAM wave band 136 show by spectrum efficiency and SNR.Each modulation wave band has all been represented such wave band, and the assurance that is modulated at of concrete operation is compared with other higher-order modulation and had minimum order of modulation under the prerequisite with best spectrum efficiency and/or PER in this wave band.The formation of each wave band, such as 16QAM 134, all originate in determining to modulation wave band intersection point, for example, 16QAM is to the intersection point of 64QAM, and also need to determine modulation wave band separator bar such as line 138 after determining intersection point, what this separator bar was represented is last spectrum efficiency that 16QAM still is better than 64QAM.The separation of modulation wave band among the CQI table 130j is based on spectrum efficiency and operation SNR determine.Wave band transition parameter Δ 1 and Δ 2 can carry out static state or Dynamic Selection based on concrete enforcement and/or QoS demand.
Fig. 4 is the schematic diagram of the modulation wave band intersection point of definite according to an embodiment of the invention CQI table that makes up.As shown in the figure, the PER curve that strides across the spectrum efficiency district is represented as the function of SNR.Modulation wave band intersection point is that high order modulation (16QAM) is at the boundary point that is better than low-order-modulated (QPSK) aspect spectrum efficiency and/or the PER.
Described modulation wave band intersection point, for example, from QPSK to 16QAM, by estimating corresponding PER according to SNR and the spectrum efficiency performance is determined.As shown in Figure 4, determining of intersection point 402 at first is by the fixing spectrum efficiency of QPSK and 16QAM correspondence of fixing allocated bandwidth, checks the PER as the function of SNR then, then from for example 1.0 to 1.4 scanning spectrum efficiencies, to identify intersection point 402.In this case, the intersection point 402 that identifies can be distributed in the spectrum efficiency [1.1,1.3].
Fig. 5 is the flow chart of steps that one embodiment of the invention generates the CQI table clause.As shown in Figure 5, flow process starts from step 502.The various parameters that are used to generate the CQI table clause are concluded as described in Table 1.In step 502, modulation wave band intersection point is identified in base station 110.At first can select to begin to generate the CQI table clause such as the modulation wave band of QPSK wave band 132.In step 512, the method for CQI table clause will be determined to generate in base station 110.For example, can select a kind of method to generate the CQI table clause based on spectrum efficiency.In step 542, can judge to determine whether it is the QPSK wave band the modulation wave band of current selection.Wave band in current selection is that flow process enters step 552 under the situation of QPSK wave band, and the range of spectral efficiencies of QPSK wave band determines that mode is as follows:
[Seff min，Seff _max_qpsk]
In step 562, described definite range of spectral efficiencies is based on for example on the basis of the feedback information of subscriber equipment 120, can being evenly or unevenly to separate from user terminal.In step 564, be calculated as follows at each the CQI table clause in the determined frequency range in this QPSK wave band:
Figure A200810179837D00131
For example, suppose that spectral range equates for QPSK wave band 132.Range of spectral efficiencies can be evenly spaced apart with 0.15 step-length.Described method based on spectrum efficiency can generate the CQI table clause in the QPSK wave band as shown in table 2.
The CQI value The R=encoding rate Order of modulation Spectrum efficiency
1 2.5000E-02 2 5.0000E-02
2 1.0000E-01 2 2.0000E-01
3 1.75000E-01 2 3.5000E-01
4 2.5000E-01 2 5.0000E-01
5 3.2500E-01 2 6.5000E-01
6 4.0000E-01 2 8.0000E-01
7 4.7500E-01 2 9.5000E-01
8 5.5000E-01 2 1.1000E+00
CQI table clause in the table 2.QPSK wave band
In step 566, judging whether needs to select a new modulation wave band to be used to generate described CQI table clause.When judgment result displays need be selected newly to modulate wave band, flow process entered step 512.In step 542, when the modulation wave band of current selection was not the QPSK wave band, execution in step 544 determined in this step whether current selected modulation wave band is the 16QAM wave band.When definite current selected wave band really is the 16QAM wave band, execution in step 554, the range of spectral efficiencies that is identified for the 16QAM wave band is as follows:
[(Seff max_qpsk+Δ1)/4，Seff _max_16qam/4]
Next step flow process enters step 562.In step 544, when judging current selected wave band and be not the 16QAM wave band, then enter into step 546, judge in this step whether current selected wave band is the 64QAM wave band.When judging current selected wave band really for the 64QAM wave band, flow process enters step 556, and the range of spectral efficiencies that is identified for the 64QAM wave band is as follows:
[(Seff max_16qam+Δ2)/6，R max]
Flow process enters step 562 subsequently.
In step 546, current selected wave band is the 64QAM wave band 136 that is used to generate the CQI table clause.In step 566, can judge whether needs to select a new modulation wave band to generate described CQI table clause.When judgment result displays need be selected a new modulation wave band for generating the CQI table clause, execution in step 502.In step 566, if when judgment result displays need not to select a new modulation wave band for generating the CQI table clause, execution in step 568, in this step, the generating run of CQI table clause finishes.The CQI table of described generation will transmit or download to the user terminal place, and for example subscriber equipment 120.The CQI table of downloading, CQI table 130 for example will be stored among the memory 120c so that processor 120b calls for base station 110 CQI is provided feedback information.In step 512, when the method that do not adopt based on spectrum efficiency, flow process enters step 524, and can generate a plurality of PER-SNR curves this moment by the fixed resource that originates in last modulation wave band.In step 532, determine and be used for generating the fixedly encoding rate of SNR step-length at selected modulation wave band.Flow process enters step 566 subsequently.
Spectrum efficiency is typically expressed as every hertz bit throughput, therefore can represent the CQI table clause by the user terminal throughput.The throughput that method based on the frequency spectrum rate shown in Figure 5 adopts is explained.In addition, the method based on the frequency spectrum rate can combine with the method based on PER in order to generate the CQI table clause.
The invention provides the method and system of the feedback in the communication system being set up the channel quality indicator table.In various embodiments of the present invention, user terminal for example subscriber equipment 120 can be from the base station 110 receives radio signals.The described radio signal that receives can be by being transmitted by base station 110 selected Modulation and Coding Scheme (MCS).Subscriber equipment 120 can come estimating channel quality information by the calculating to the signal to noise ratio (snr) of the radio signal that receives by processor 120b, and based on the SNR estimation CQI table 130 that calculates with identification corresponding C QI value.CQI 130 can comprise the multiple modulation wave band that spectrum efficiency is different, as shown in Figure 2.The CQI value that identifies has characterized in the modulation wave band the exclusive MCS at specific frequency spectrum efficient.Subscriber equipment 120 can generate the CQI message that includes the described CQI value that identifies or CQI reports and described CQI message or CQI report are sent to base station 110 by transceiver 120a.Base station 110 can utilize different modular system agreements, and for example, 3GPP, 3GPP LTE, or WiMAX communicate with subscriber equipment 120, and wherein, described agreement is supported the CQI report program.Each modulates wave band, and for example, QPSK wave band 132 can comprise the Modulation and Coding Scheme (MCS) of a plurality of different spectral efficient.As shown in Figure 3, the higher-order modulation wave band as 16QAM wave band 134, is being better than the lower order modulated wave band aspect spectrum efficiency and/or the SNR, and for example the QPSK wave band 132.CQI table 130 can generate also by base station 110/or upgrade upgrading by it, and send subscriber equipment 120 to by means of signaling.Base station 110 can generate CQI table 130 by the detection to PER-spectrum efficiency and/or PER-SNR, as described respectively among Fig. 3,4 and 5.Base station 110 can be based on CQI feedback and generation of subscriber equipment 120 capacity and/or the renewal CQI table 130 from subscriber equipment 120.In addition, based on the feedback from subscriber equipment 120, MCS be regulated, be selected in base station 110 can to the distribution of radio resource, and adopt selected MCS to send radio signal subsequently to subscriber equipment 120.
One embodiment of the present of invention have comprised a kind of machine readable memory, store computer program on it.This program comprises one section code that is used for the information that transmits at communication network at least, and described at least one section code carried out by machine and made this machine can carry out the method step described in the application.
Therefore, the present invention can be applicable to hardware, software, firmware or its various combinations.The present invention can realize under the hubbed mode of at least one computer system, perhaps realizes under distributed mode, and under described distributed mode, different assemblies are distributed in several interconnected computer systems.Adopt and anyly be applicable to that computer system or other equipment of the method for carrying out introduction of the present invention all are suitable.The typical combination of a kind of hardware, software and firmware is the general-purpose computing system with computer program, when program is loaded and carry out, controls described computer system so that it carries out the method that the application describes.
One embodiment of the present of invention can be implemented as plate level product, single-chip, application-specific integrated circuit (ASIC) (ASIC) or are integrated in the single-chip with different integrated levels with the other parts of system as independent parts.The integrated level of described system will depend primarily on speed and cost consideration.Because nowadays ripe processor technology, it is possible utilizing an existing commercial processor, and described processor can be implemented in the outside that ASIC of the present invention realizes.Perhaps, if described processor exists with ASIC nuclear or logical block, so existing commercial processors can be used to be embodied as the part of ASIC equipment, realizes its multiple function with the firmware mode.
The present invention can also be embedded in the computer program, and described computer program comprises whole features that can realize the inventive method, when it is installed in the computer system, by operation, can realize method of the present invention.Computer program in the presents refers to: one group of any expression formula of instructing that can adopt any program language, code or symbol to write, this instruction group makes system have information processing capability, with direct realization specific function, or after carrying out following one or two step, realize specific function: a) convert other Languages, coding or symbol to; B) reproduce with different forms.Yet other implication of the computer program that those skilled in the art can understand is also comprised by the present invention.
Though the present invention describes by several specific embodiments, it will be appreciated by those skilled in the art that, without departing from the present invention, can also carry out various conversion and be equal to alternative the present invention.In addition, at particular condition or concrete condition, can make various modifications to the present invention, and not depart from the scope of the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole execution modes that fall in the claim scope of the present invention.

Claims (10)

1, a kind of wireless communication method is characterized in that, described method comprises:
Receive radio signals from the base station by user terminal, wherein, described radio signal utilizes first Modulation and Coding Scheme to transmit;
Channel quality information is sent to described base station from described user terminal, wherein, described channel quality information is to determine that based on described radio signal that receives and the channel quality indicator table that comprises a plurality of modulation wave bands described a plurality of modulation wave bands distribute by spectrum efficiency by described user terminal.
2, method according to claim 1 is characterized in that, described radio signal comprises in the following signal: 3GPP signal, 3GPP Long Term Evolution signal and WiMAX signal.
3, method according to claim 1 is characterized in that, described channel quality information is the channel quality indicator value.
4, method according to claim 1 is characterized in that, described a plurality of modulation wave bands comprise multiple Modulation and Coding Scheme.
5, method according to claim 1 is characterized in that, described modulation wave band is included in the high order modulation wave band that is better than the low-order-modulated wave band on spectrum efficiency and/or the signal to noise ratio.
6, method according to claim 1 is characterized in that, described base station generates and/or upgrades described channel quality indicator table.
7, a kind of wireless telecommunication system is characterized in that, described system comprises:
Be used for one or more circuit of receiving radio signals from the base station by user terminal, wherein, described radio signal utilizes first Modulation and Coding Scheme to transmit;
Described one or more circuit is sent to described base station with channel quality information from described user terminal, wherein, described channel quality information is to determine that based on described radio signal that receives and the channel quality indicator table that comprises a plurality of modulation wave bands described a plurality of modulation wave bands distribute by spectrum efficiency by described user terminal.
8, system according to claim 7 is characterized in that, described radio signal comprises in the following signal: 3GPP signal, 3GPP Long Term Evolution signal and WiMAX signal.
9, system according to claim 7 is characterized in that, described channel quality information is the channel quality indicator value.
10, system according to claim 7 is characterized in that, described a plurality of modulation wave bands comprise multiple Modulation and Coding Scheme.
CNA2008101798371A 2007-11-30 2008-12-01 Method and system for constructing channel quality indicator tables for feedback in a communication system Pending CN101448284A (en)

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