CN105553616A - Channel quality indicator selection method as well as adaptive modulation and coding method and device - Google Patents

Channel quality indicator selection method as well as adaptive modulation and coding method and device Download PDF

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Publication number
CN105553616A
CN105553616A CN201510959022.5A CN201510959022A CN105553616A CN 105553616 A CN105553616 A CN 105553616A CN 201510959022 A CN201510959022 A CN 201510959022A CN 105553616 A CN105553616 A CN 105553616A
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China
Prior art keywords
channel quality
indicated value
quality indicated
modulating
value
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CN201510959022.5A
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CN105553616B (en
Inventor
杨�远
鞠明
苏加加
曹晏波
乔元新
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Pla Air Force Armament Department Of Ministry Of Airborne Equipment Outfield Arms Branch
DATANG LINKTECH INFOSYSTEM Co Ltd
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Pla Air Force Armament Department Of Ministry Of Airborne Equipment Outfield Arms Branch
DATANG LINKTECH INFOSYSTEM Co Ltd
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Priority to CN201510959022.5A priority Critical patent/CN105553616B/en
Publication of CN105553616A publication Critical patent/CN105553616A/en
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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
    • 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
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • 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
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • 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
    • H04L1/0014—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the source coding

Abstract

An embodiment of the present invention discloses a channel quality indicator selection method as well as an adaptive modulation and coding method and device. A channel quality indicator value is selected by comprehensively considering a signal-to-noise ratio and a block error rate, wherein the selected channel quality indicator value can better reflect interference conditions of a channel, so that a signal transmitting end can select a more appropriate modulation and coding format after receiving the channel quality indicator value, so as to ensure the link connection under the interference conditions and acquire a higher channel capacity. The signal transmitting end further determines the more appropriate modulation and coding format by comprehensively considering service characteristics and the received channel quality indicator value after receiving the channel quality indicator value, thereby combining the service characteristics to ensure the link connection under the interference conditions.

Description

Channel quality instruction system of selection, adaptive modulation coding method and device
Technical field
The present invention relates to communication technical field, more particularly, relate to a kind of channel quality instruction system of selection, adaptive modulation coding method and device.
Background technology
Adaptive Modulation and Coding (AdaptiveModulationandCoding, AMC) technology widely uses in public mobile communications network, for resisting the impact of channel fading on communication system.By receiving terminal measurement pilot frequency, obtain signal-to-noise ratio (SNR) estimation, be mapped as channel quality by signal-to-noise ratio (SNR) estimation again and indicate (ChannelQualityIndicator, CQI) value, and being sent to transmitting terminal by feedback channel, transmitting terminal knows current channel condition thus, selects suitable modulating-coding mechanism (ModulationandCodingScheme, MCS), higher channel capacity is obtained.
Common AMC technology only considers the impact that channel brings, only reflect channel quality by measuring signal to noise ratio mapping CQI, the disturbed condition in present channel can not be reflected, thus likely do the CQI feedback made mistake in an interference situation, cause transmitting terminal can not select suitable MCS, likely cause interrupted communication link.
Summary of the invention
The object of this invention is to provide a kind of channel quality instruction system of selection, adaptive modulation coding method and device, to ensure to obtain higher channel capacity in an interference situation and to ensure that link connects.
For achieving the above object, the invention provides following technical scheme:
A kind of channel quality instruction system of selection, is applied to second communication equipment, comprises:
According to Received signal strength estimated snr, and add up the Block Error Rate of actual time window; Described Received signal strength sends by with the first communication equipment that described second communication equipment carries out communicating;
Based on the Block Error Rate selective channel quality indicated value of described signal to noise ratio and described actual time window.
Said method, preferably, the described Block Error Rate selective channel quality instruction based on described signal to noise ratio and described actual time window comprises:
Based on the Block Error Rate determination channel quality indicated value span of described signal to noise ratio and described actual time window;
Selective channel quality indicated value from determined channel quality indicated value span.
Said method, preferably, the described Block Error Rate determination channel quality indicated value span based on described signal to noise ratio and described actual time window comprises:
Based on described signal to noise ratio, and prestore corresponding with each channel quality indicated value noiseless time Block Error Rate-signal to noise ratio curve, determine corresponding with each channel quality indicated value noiseless time Block Error Rate;
From the channel quality indicated value corresponding with the Block Error Rate meeting error block rate requirement, determine that maximum channel quality indicated value is the measured value of the channel quality instruction of actual time window;
Based on the Block Error Rate of described actual time window, determine the backoff channel quality indicated value corresponding with the Block Error Rate of described actual time window, based on the channel quality indicated value that the modulating-coding form that described backoff channel quality indicated value uses by the signal be currently received is corresponding, rollback preset value is determined;
Determine channel quality indicated value span, described channel quality indicated value span comprises: the minimum value CQI of channel quality indicated value min, the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCS, the measured value CQI of the channel quality instruction of described actual time window measure, and the backoff channel quality indicated value CQI that the Block Error Rate of described and described actual time window is corresponding backoff.
Said method, preferably, the described Block Error Rate based on described actual time window, determine that the backoff channel quality indicated value corresponding with the Block Error Rate of described actual time window comprises:
If the Block Error Rate of described actual time window is less than or equal to the first predetermined threshold value, then corresponding with the Block Error Rate of described actual time window backoff channel quality indicated value CQI backofffor: the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCSwith the difference of the first preset value;
If the Block Error Rate of described actual time window is greater than described first predetermined threshold value and is less than the second predetermined threshold value, then corresponding with the Block Error Rate of described actual time window backoff channel quality indicated value CQI backofffor: the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCSwith the difference of the second preset value;
If the Block Error Rate of described actual time window is greater than described second predetermined threshold value, then corresponding with the Block Error Rate of described actual time window backoff channel quality indicated value CQI backofffor: the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCSwith the difference of the 3rd preset value;
Wherein, described first predetermined threshold value is less than described second predetermined threshold value; Described first preset value is less than described second preset value, and described second preset value is less than described 3rd preset value.
Said method, preferably, described from determined channel quality indicated value span selective channel quality indicated value comprise:
If the Block Error Rate of described actual time window is zero, judge that the time interval of current time slots apart from a upper time slot of makeing mistakes is whether in effective time interval, if so, the channel quality indicated value CQI that the modulating-coding form that the signal be currently received described in then selecting from determined channel quality indicated value span uses is corresponding mCS; If not, then from determined channel quality indicated value span, select the measured value CQI that the channel quality of described actual time window indicates measure;
If the Block Error Rate of described actual time window is non-vanishing, the second efficiency that first efficiency corresponding to measured value of the channel quality instruction of the more described actual time window channel quality indicated value corresponding with the modulating-coding form that the described signal be currently received uses is corresponding, if described first efficiency is less than described second efficiency, select formula selective channel quality indicated value according to following: CQI select=max{CQI min, min{CQI measure, CQI backoff; If described first efficiency is greater than described second efficiency, select formula selective channel quality indicated value according to following: CQI select=max{CQI min, CQI backoff;
Wherein, CQI selectfor selected channel quality indicated value.
A kind of adaptive modulation coding method, is applied to the first communication equipment, comprises:
The channel quality indicated value sent with the second communication equipment that described first communication equipment carries out communicating is received by feedback channel, described channel quality indicated value by described second communication equipment foundation Received signal strength estimated snr, and adds up the Block Error Rate of preset time window; Block Error Rate based on described signal to noise ratio and described preset time window is selected to determine;
According to the channel quality indicated value determination modulating-coding form received;
Modulating-coding is carried out to sent signal based on the described modulating-coding form determined.
Said method, preferably, the channel quality indicated value determination modulating-coding form that described foundation receives comprises:
Determine the type of the business of the current carrying of described first communication equipment;
The modulating-coding form corresponding with determined type of service is determined according to the channel quality indicated value received.
Said method, preferably, the channel quality indicated value that described foundation receives determines that the modulating-coding form corresponding with determined type of service comprises:
If the business of the current carrying of described first communication equipment is the business of type of doing one's best, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form.
Said method, preferably, the channel quality indicated value that described foundation receives determines that the modulating-coding form corresponding with determined type of service comprises:
If the business of the current carrying of described first communication equipment is the business high to reliability requirement, calculate based on received channel quality indicated value the bit number that next time slot can carry;
If the bit number that next time slot calculated based on received channel quality indicated value can carry is less than the bit number of the business of the current carrying of described first communication equipment, calculate the modulating-coding form corresponding with determined type of service;
If the bit number that next time slot calculated based on received channel quality indicated value can carry is greater than the bit number of the business of the current carrying of described first communication equipment, with the channel quality indicated value received for the upper limit, from received channel quality indicated value, calculate the bit number that next time slot corresponding with channel quality indicated value can carry successively, determine that minimum channel quality indicated value when bit number that next time slot can carry is greater than the bit number of the business of described first communication equipment current carrying is target channel quality indicated value, determine that the modulating-coding form corresponding with described target channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form.
Said method, preferably, the channel quality indicated value that described foundation receives determines that the modulating-coding form corresponding with determined type of service comprises:
If the business of the current carrying of described first communication equipment is the business needing to keep constant rate of speed link, calculate based on received channel quality indicated value the bit number that next time slot can carry;
If the bit number that next time slot calculated based on received channel quality indicated value can carry is less than the bit number of the business of the current carrying of described first communication equipment, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form;
If the bit number that next time slot calculated based on received channel quality indicated value can carry equals the bit number of the business of the current carrying of described first communication equipment, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form;
If the bit number that next time slot calculated based on received channel quality indicated value can carry is greater than the bit number of the business of the current carrying of described first communication equipment, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form, and the business of the current carrying of described first communication equipment and the same time slot of other service integration.
A kind of channel quality instruction choice device, is applied to second communication equipment, comprises:
Processing module, for foundation Received signal strength estimated snr, and adds up the Block Error Rate of actual time window; Described Received signal strength sends by with the first communication equipment that described second communication equipment carries out communicating;
Select module, for the Block Error Rate selective channel quality indicated value based on described signal to noise ratio and described actual time window.
Said apparatus, preferably, described selection module comprises:
Determine submodule, for the Block Error Rate determination channel quality indicated value span based on described signal to noise ratio and described actual time window;
Chooser module, for selective channel quality indicated value from determined channel quality indicated value span.
Said apparatus, preferably, determine that submodule comprises:
First determining unit, for based on described signal to noise ratio, and prestore corresponding with each channel quality indicated value noiseless time Block Error Rate-signal to noise ratio curve, determine corresponding with each channel quality indicated value noiseless time Block Error Rate;
Second determining unit, for determining that from the channel quality indicated value corresponding with the Block Error Rate meeting error block rate requirement maximum channel quality indicated value is the measured value that the channel quality of actual time window indicates;
3rd determining unit, for the Block Error Rate based on described actual time window, determine the backoff channel quality indicated value corresponding with the Block Error Rate of described actual time window, based on the channel quality indicated value that the modulating-coding form that described backoff channel quality indicated value uses by the signal be currently received is corresponding, rollback preset value is determined;
4th determining unit, for determining described channel quality indicated value span, described channel quality indicated value span comprises: the minimum value CQI of channel quality indicated value min, the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCS, the measured value CQI of the channel quality instruction of described actual time window measure, and the backoff channel quality indicated value CQI that the Block Error Rate of described and described actual time window is corresponding backoff.
Said apparatus, preferably, described 3rd determining unit specifically for,
If the Block Error Rate of described actual time window is less than or equal to the first predetermined threshold value, then corresponding with the Block Error Rate of described actual time window backoff channel quality indicated value CQI backofffor: the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCSwith the difference of the first preset value;
If the Block Error Rate of described actual time window is greater than described first predetermined threshold value and is less than the second predetermined threshold value, then corresponding with the Block Error Rate of described actual time window backoff channel quality indicated value CQI backofffor: the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCSwith the difference of the second preset value;
If the Block Error Rate of described actual time window is greater than described second predetermined threshold value, then corresponding with the Block Error Rate of described actual time window backoff channel quality indicated value CQI backofffor: the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCSwith the difference of the 3rd preset value;
Wherein, described first predetermined threshold value is less than described second predetermined threshold value; Described first preset value is less than described second preset value, and described second preset value is less than described 3rd preset value.
Said apparatus, preferably, described chooser module specifically for,
If the Block Error Rate of described actual time window is zero, judge that the time interval of current time slots apart from a upper time slot of makeing mistakes is whether in effective time interval, if so, the channel quality indicated value CQI that the modulating-coding form that the signal be currently received described in then selecting from determined channel quality indicated value span uses is corresponding mCS; If not, then from determined channel quality indicated value span, select the measured value CQI that the channel quality of described actual time window indicates measure;
If the Block Error Rate of described actual time window is non-vanishing, the second efficiency that first efficiency corresponding to measured value of the channel quality instruction of the more described actual time window channel quality indicated value corresponding with the modulating-coding form that the described signal be currently received uses is corresponding, if described first efficiency is less than described second efficiency, select formula selective channel quality indicated value according to following: CQI select=max{CQI min, min{CQI measure, CQI backoff; If described first efficiency is greater than described second efficiency, select formula selective channel quality indicated value according to following: CQI select=max{CQI min, CQI backoff;
Wherein, CQI selectfor selected channel quality indicated value.
A kind of Adaptive Modulation and Coding device, is applied to the first communication equipment, comprises:
Receiver module, for being received the channel quality indicated value sent with the second communication equipment that described first communication equipment carries out communicating by feedback channel, described channel quality indicated value by described second communication equipment foundation Received signal strength estimated snr, and adds up the Block Error Rate of preset time window; Block Error Rate based on described signal to noise ratio and described preset time window is selected to determine;
Determination module, for the channel quality indicated value determination modulating-coding form that foundation receives;
Modulating-coding module, for carrying out modulating-coding based on the described modulating-coding form determined to sent signal.
Said apparatus, preferably, described determination module comprises:
First determines submodule, for determining the type of the business of the current carrying of described first communication equipment;
Second determines submodule, for determining the modulating-coding form corresponding with determined type of service according to the channel quality indicated value received.
Said apparatus, preferably, described second determines that submodule comprises:
First determining unit, if the business for the current carrying of described first communication equipment is the business of type of doing one's best, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form.
Said apparatus, preferably, described second determines that submodule comprises:
First computing unit, if be the business high to reliability requirement for the business of the current carrying of described first communication equipment, calculates based on received channel quality indicated value the bit number that next time slot can carry;
Second computing unit, if the bit number that can carry for next time slot calculated based on received channel quality indicated value is less than the bit number of the business of the current carrying of described first communication equipment, calculate the modulating-coding form corresponding with determined type of service;
Second determining unit, if the bit number that can carry for next time slot calculated based on received channel quality indicated value is greater than the bit number of the business of the current carrying of described first communication equipment, with the channel quality indicated value received for the upper limit, from received channel quality indicated value, calculate the bit number that next time slot corresponding with channel quality indicated value can carry successively, determine that minimum channel quality indicated value when bit number that next time slot can carry is greater than the bit number of the business of described first communication equipment current carrying is target channel quality indicated value, determine that the modulating-coding form corresponding with described target channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form.
Said apparatus, preferably, described second determines that submodule comprises:
3rd computing unit, if be the business needing to keep constant rate of speed link for the business of the current carrying of described first communication equipment, calculates based on received channel quality indicated value the bit number that next time slot can carry;
4th computing unit, if the bit number that can carry for next time slot calculated based on received channel quality indicated value is less than the bit number of the business of the current carrying of described first communication equipment, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form;
3rd determining unit, if the bit number that can carry for next time slot calculated based on received channel quality indicated value equals the bit number of the business of the current carrying of described first communication equipment, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form;
4th determining unit, if the bit number that can carry for next time slot calculated based on received channel quality indicated value is greater than the bit number of the business of the current carrying of described first communication equipment, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form, and the business of the current carrying of described first communication equipment and the same time slot of other service integration.
Known by above scheme, a kind of channel quality instruction system of selection that the application provides, adaptive modulation coding method and device, consider signal to noise ratio and Block Error Rate selective channel quality indicated value, what selected channel quality instruction better can react channel is disturbed situation, thus make signal sending end after receiving channel quality indicated value, more suitably modulating-coding form can be selected, thus can ensure that link in an interference situation connects and obtains higher channel capacity.Further, signal sending end, after receiving channel quality indicated value, is taken service feature into consideration and is determined more suitable modulating-coding form with the channel quality indicated value received, thus ensures that link in an interference situation connects in conjunction with traffic performance.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
A kind of realization flow figure of the channel quality instruction system of selection that Fig. 1 provides for the embodiment of the present application;
A kind of realization flow figure of the Block Error Rate selective channel quality indicated value based on signal to noise ratio and actual time window that Fig. 2 provides for the embodiment of the present application;
A kind of realization flow figure of the Block Error Rate determination channel quality indicated value span based on estimated signal to noise ratio and actual time window that Fig. 3 provides for the embodiment of the present application;
A kind of realization flow figure of the method for the modulating-coding that Fig. 4 provides for the embodiment of the present application;
A kind of realization flow figure according to the channel quality indicated value determination modulating-coding form received that Fig. 5 provides for the embodiment of the present application;
The throughput changing trend diagram of frequency-hopping system under the different signal to noise ratios of the noiseless situation that Fig. 6 provides for the embodiment of the present application;
When the frequency of the different proportion that Fig. 7 provides for the embodiment of the present application is interfered, the throughput changing trend diagram of frequency-hopping system under different signal to noise ratio;
When the frequency of the different proportion that Fig. 8 provides for the embodiment of the present application is interfered, the error rate changing trend diagram of frequency-hopping system under different signal to noise ratio;
When the frequency of the different proportion that Fig. 9 provides for the embodiment of the present application is interfered, the throughput changing trend diagram of frequency-hopping system;
When the frequency of the different proportion that Figure 10 provides for the embodiment of the present application is interfered, the error rate changing trend diagram of frequency-hopping system;
A kind of structural representation of the channel quality instruction choice device that Figure 11 provides for the embodiment of the present application;
A kind of structural representation of the modulating-coding device that Figure 12 provides for the embodiment of the present application.
Term " first ", " second ", " the 3rd " " 4th " etc. (if existence) in specification and claims and above-mentioned accompanying drawing are for distinguishing similar part, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so that the embodiment of the application described herein can be implemented with the order except illustrated here.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not paying the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The channel quality indicator (CQI) system of selection that the embodiment of the present invention provides and device, be applied to second communication equipment, and the first communication equipment can communicate with second communication equipment.
Refer to Fig. 1, a kind of realization flow figure of the channel quality instruction system of selection that Fig. 1 provides for the embodiment of the present application, can comprise:
Step S11: according to Received signal strength estimated snr, and add up the Block Error Rate of actual time window; Wherein Received signal strength sends by with the first communication equipment that second communication equipment carries out communicating;
First communication equipment and second communication equipment carry out in the process communicated, and the first communication equipment sends the signal after modulating-coding according to business demand to second communication equipment.
When needs send useful data, CRC check can be carried out to the useful data that will send in first communication equipment side first, namely CRC check data are generated, useful data carries out chnnel coding after adding CRC check data, constellation is modulated, frequency pilot sign is inserted in the data symbol (i.e. code block) through aforesaid operations, thus composition structure of time slot (can carry a code block in a structure of time slot, also multiple code block can be carried, specifically can carry the bearing capacity how much depending on structure of time slot, the size of code block, the factors such as code check), then, frequency conversion is carried out after molding filtration process, the operations such as amplification, go out finally by antenna transmission.Wherein, specific code check and modulation system be combined into a kind of modulating-coding form MCS, conveniently process, can be numbered modulation coded format, usually, coded format numbering processed is less, and the combination of general corresponding lower code check and/or lower modulation system, same information source length can be selected multiple MCS to send.
In the embodiment of the present invention, second communication equipment, after the signal receiving the first communication equipment transmission, after (i.e. baseband signal) accepts filter to the received signal, carries out time synchronized, subsequently, the frequency pilot sign of signal is separated with data symbol.Wherein, signal detection module sent into by data symbol, and frequency pilot sign sends into channel estimation module.
Channel estimation module utilizes frequency pilot sign to carry out channel estimating, after obtaining original time domain channel (abbreviation original channel) estimation, carry out noise power estimation, utilize noise power estimation value, to estimating that the original channel obtained carries out noise reduction, obtain the estimation channel after noise reduction, estimate according to the power of estimation channel to useful signal after noise reduction, the power of the subscriber signal obtained with estimation obtains the estimated value of signal to noise ratio divided by noise power estimation value.If have multiple pilot tone in a time slot, multiple signal-to-noise ratio (SNR) estimation value can be obtained, the mean value of the estimated value of the multiple signal to noise ratios in a time slot can be defined as the estimated value of the signal to noise ratio of this time slot; In the embodiment of the present invention, analyzing and processing is carried out to the received signal by preset time window, this preset time window at least can comprise a time slot, if the preset time window be somebody's turn to do comprises two or more time slot, then the mean value of the estimated value of the signal to noise ratio of each time slot in a time window is defined as the estimated value of the signal to noise ratio of this time window.A concrete time window comprises several time slot and can determine according to concrete communication system and applied environment thereof.
The channel that signal detection module utilizes channel estimation module to estimate carries out equilibrium to data symbol and separates constellation mapping obtaining the estimated value of useful data and the estimated value of CRC check data, then the estimated value feeding channel decoder of the estimated value of useful data and CRC check data is carried out decoding, CRC check data are recalculated to completing the recovery data division after channel decoding, the CRC check data recovered after recalculating the CRC check data that obtain and completing channel decoding are compared, if comparison result is consistent, then determine that code block corresponding to CRC check data is correct, if comparison result is inconsistent, then determine the code block error that CRC check data are corresponding, the ratio of the total code block quantity in the quantity of the code block made a mistake in a time window and this time window is defined as the block error rate BLER of this time window.
Step S12: based on the Block Error Rate selective channel quality indicated value of signal to noise ratio and actual time window.
The channel quality instruction system of selection that the embodiment of the present invention provides, consider signal to noise ratio and Block Error Rate selective channel quality indicated value, what selected channel quality instruction better can react channel is disturbed situation, thus make signal sending end after receiving channel quality indicated value, more suitably modulating-coding form can be selected, thus can ensure to obtain higher channel capacity in an interference situation and ensure that link connects.
Optionally, based on the Block Error Rate selective channel quality indicated value of signal to noise ratio and actual time window a kind of realization flow figure as shown in Figure 2, can comprise:
Step S21: based on the Block Error Rate determination channel quality indicated value span of estimated signal to noise ratio and actual time window;
In the embodiment of the present invention, determined channel quality indicated value span is made up of some channel quality indicated values.
The Block Error Rate of actual time window is different, and the span of determined channel quality indicated value may be different.
Step S22: selective channel quality indicated value from determined channel quality indicated value span.
Be specifically as follows, according to the Block Error Rate of actual time window, the measured value of the channel quality instruction of actual time window, and the channel quality indicated value that the modulating-coding form of the signal use be currently received is corresponding, selective channel quality indicated value from determined channel quality indicated value span.
Optionally, based on the Block Error Rate determination channel quality indicated value span of estimated signal to noise ratio and actual time window a kind of realization flow figure as shown in Figure 3, can comprise:
Step S31: based on estimated signal to noise ratio, and prestore corresponding with each channel quality indicated value noiseless time Block Error Rate-signal to noise ratio curve, determine corresponding with each channel quality indicated value noiseless time Block Error Rate;
In the embodiment of the present invention, Block Error Rate-signal to noise ratio curve that different channel quality indicated values is corresponding different, Block Error Rate-signal to noise ratio curve embodies the variation relation of Block Error Rate and signal to noise ratio.All values of CQI are all known, for each CQI value, by the Block Error Rate corresponding with this CQI value-signal to noise ratio curve, can determine the Block Error Rate corresponding with this CQI value.
Step S32: from the channel quality indicated value corresponding with the Block Error Rate meeting error block rate requirement, determines that maximum channel quality indicated value is the measured value of the channel quality instruction of actual time window;
Meeting error block rate requirement, to refer to that the value of Block Error Rate meets pre-conditioned.
In the embodiment of the present invention, from all CQI value, select corresponding Block Error Rate to meet the CQI value set of error block rate requirement, from this CQI value set, determine that maximum channel quality indicated value is the measured value of the channel quality instruction of actual time window.
Step S33: based on the Block Error Rate of actual time window, determine the backoff channel quality indicated value corresponding with the Block Error Rate of actual time window, based on the channel quality indicated value that the modulating-coding form that backoff channel quality indicated value uses by the signal be currently received is corresponding, rollback preset value is determined;
The preset value that different Block Error Rates is corresponding may be different.
In the embodiment of the present invention, the execution sequence of step S31 and step S33 is not specifically limited, and first can perform step S31, then perform step S33, or, first perform step S33, then perform step S31, or step S31 and step S33 performs simultaneously.
Step S34: determine channel quality indicated value span, described channel quality indicated value span comprises: the minimum value CQI of channel quality indicated value min, the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCS, the measured value CQI of the channel quality instruction of actual time window measure, and determined backoff channel quality indicated value CQI backoff.
Optionally, based on the Block Error Rate of actual time window, determine that a kind of implementation of the backoff channel quality indicated value corresponding with the Block Error Rate of actual time window can be:
If the Block Error Rate of actual time window is less than or equal to the first predetermined threshold value, then corresponding with the Block Error Rate of actual time window backoff channel quality indicated value CQI backofffor: the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCSwith the first preset value D 1difference;
Can be expressed as with formula: CQI backoff=CQI mCS-D 1.
The signal that the signal be currently received and actual time window finally receive.
If the Block Error Rate of actual time window is greater than the first predetermined threshold value and be less than the second predetermined threshold value, then corresponding with the Block Error Rate of actual time window backoff channel quality indicated value CQI backofffor: the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCSwith the second preset value D 2difference;
Can be expressed as with formula: CQI backoff=CQI mCS-D 2.
If the Block Error Rate of actual time window is greater than the second predetermined threshold value, then corresponding with the Block Error Rate of actual time window backoff channel quality indicated value CQI backofffor: the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCSwith the 3rd preset value D 3difference;
Can be expressed as with formula: CQI backoff=CQI mCS-D 3.
Wherein, the first predetermined threshold value is less than the second predetermined threshold value; First preset value is less than the second preset value, and the second preset value is less than the 3rd preset value.
Such as, the first predetermined threshold value can be the 0.1, second predetermined threshold value can be the 0.9, first preset value can be the 1, second preset value can be the 2, three preset value can be 3
Optionally, from determined channel quality indicated value scope, a kind of implementation of selective channel quality indicated value can be:
If the Block Error Rate of actual time window is zero, judge that the time interval of current time slots apart from a upper time slot of makeing mistakes is whether in effective time interval, if so, the channel quality indicated value CQI that the modulating-coding form then selecting the signal be currently received to use from determined channel quality indicated value span is corresponding mCS; If not, then the measured value CQI selecting the channel quality of actual time window to indicate from determined channel quality indicated value span measure;
The time slot finally received in current time slots and actual time window.
When the Block Error Rate of actual time window is zero, if current time slots apart from time interval of a upper time slot of makeing mistakes (namely there is the time slot of erroneous block) in effective time interval, the channel quality indicated value that the modulating-coding form then used by the signal be currently received is corresponding feeds back to signal sending end as CQI feedback value, i.e. the first communication equipment; If the measured value that the channel quality of actual time window indicates not in effective time interval, is then fed back to signal sending end as CQI feedback value apart from time interval of a upper time slot of makeing mistakes by current time slots.
If the Block Error Rate of actual time window is non-vanishing, the second efficiency that the first efficiency that relatively measured value of the channel quality instruction of actual time window is corresponding channel quality indicated value corresponding with the modulating-coding form that the signal be currently received uses is corresponding, if the first efficiency is less than the second efficiency, select formula selective channel quality indicated value according to following: CQI select=max{CQI min, min{CQI measure, CQI backof} f; If the first efficiency is greater than the second efficiency, select formula selective channel quality indicated value according to following: CQI select=max{CQI min, CQI backoff;
Wherein, CQI selectfor selected channel quality indicated value, CQI minfor the minimum value of channel quality indicated value, CQI measurefor the measured value that the channel quality of actual time window indicates, CQI backofffor the backoff channel quality indicated value corresponding with the Block Error Rate of actual time window.
CQI value is the instruction of signal receiving end to channel quality, is also the combination of code check and modulation system, and CQI value definition can be consistent or inconsistent with the definition of MCS value.
If CQI value and MCS value define inconsistent, for the ease of comparing, channel quality indicator (CQI) value and MCS value can be converted to efficiency, wherein, efficiency corresponding to CQI value refers to: the product of the code check that the number of the bit of the every symbols carry of CQI value corresponding modulating mode is corresponding with CQI value; Efficiency corresponding to MCS value refers to: the product of the code check that the number of the bit of the every symbols carry of MCS value corresponding modulating mode is corresponding with MCS value.Due to when determining the modulating-coding form corresponding with channel quality indicated value according to channel quality indicated value and the corresponding relation of modulating-coding form, being according to efficiency conversion, being converted to the immediate CQI value of efficiency by MCS value.Therefore, formula can be selected by the instruction of efficiency comparison determination channel quality.
If CQI value is consistent with the definition of MCS value, then can directly compare with the MCS value that the signal be currently received uses by the CQI value of actual time window, namely characterize the first efficiency by the CQI value of actual time window, characterize the second efficiency by the MCS value that the signal be currently received uses.
Usually, channel quality indicated value from 0 open numbering, as 0,1,2,3,4 ..., based on this, the minimum value of channel quality indicated value is 0.
When the first efficiency equals the second efficiency, can select formula, to select any one to select formula to carry out the instruction of selective channel quality from above-mentioned two.
Optionally, the embodiment of the present invention also provides a kind of adaptive modulation coding method, the adaptive modulation coding method that the embodiment of the present invention provides and application of installation are in the first communication equipment, a kind of realization flow figure of the adaptive modulation coding method that the embodiment of the present invention provides as shown in Figure 4, can comprise:
Step S41: by feedback channel receive with the channel quality indicated value CQI that sends of the first communication equipment second communication equipment of carrying out communicating, channel quality indicated value by second communication equipment foundation Received signal strength estimated snr, and adds up the Block Error Rate of preset time window; Select to determine based on estimated signal to noise ratio and the Block Error Rate of the preset time window added up;
The process of concrete second communication equipment choice determination channel quality indicated value referring to the embodiment of aforementioned channels quality instruction system of selection, can repeat no more here.
Step S42: according to the channel quality indicated value determination modulating-coding form received;
Step S43: carry out modulating-coding to sent signal based on determined modulating-coding form.
The modulation coding method that the embodiment of the present invention provides, user determines that the channel quality instruction adjusting coded format has considered signal to noise ratio and Block Error Rate, that better can react channel is disturbed situation, thus make signal sending end (i.e. the first communication equipment) after receiving channel quality indicated value, more suitably modulating-coding form can be selected, thus can ensure that link in an interference situation connects.
Optionally, a kind of realization flow figure of the channel quality indicated value determination modulating-coding form that foundation receives as shown in Figure 5, can comprise:
Step S51: determine the type of business of the current carrying of the first communication equipment;
The type of the business of the current carrying of the first communication equipment can be determined according to pre-configured type of service parameter.
The business that concrete first communication equipment can carry belongs to any type of service and can be allocated in advance by technical staff and determine.
Step S52: determine the modulating-coding form corresponding with determined type of service according to the channel quality indicated value received.
In the embodiment of the present invention, signal sending end (i.e. the first communication equipment) is after receiving channel quality indicated value, take service feature into consideration and determine more suitable modulating-coding form with the channel quality indicated value received, thus ensure that link in an interference situation connects and obtains higher channel capacity further.
Optionally, the business of the current carrying of the first communication equipment can comprise: the business of type of doing one's best, the business high to reliability requirement, needs the business keeping constant rate of speed link.
If the business of the current carrying of the first communication equipment is the business of type of doing one's best, this kind of business needs to complete as early as possible transmission and not high to reliability requirement usually, according to the corresponding relation of predetermined channel quality indicated value and modulating-coding form, can determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service.
If the business of the current carrying of the first communication equipment is the business high to reliability requirement, with reference to the channel quality indicated value received, and consider the bit number that next time slot can carry, use and be less than or equal to the channel quality indicated value determination modulating-coding form received, and use alap modulating-coding form.Concrete,
If the business of the current carrying of the first communication equipment is the business high to reliability requirement, calculate based on received channel quality indicated value the bit number that next time slot can carry;
If the bit number that next time slot calculated based on received channel quality indicated value can carry is less than the bit number of the business of the current carrying of described first communication equipment, calculate the modulating-coding form corresponding with determined type of service;
If the bit number that next time slot calculated based on received channel quality indicated value can carry is less than the bit number of the business of the current carrying of described first communication equipment, illustrate that next time slot can not carry the bit number of current business completely, it is then current business application time interval resource, and by calculating the modulating-coding form corresponding with determined type of service, even next time slot can not carry the bit number of current business completely, then need to apply for more multi-slot, and use the channel quality instruction received to determine modulating-coding form.
If the bit number that next time slot calculated based on received channel quality indicated value can carry is greater than the bit number of the business of the current carrying of described first communication equipment, with the channel quality indicated value received for the upper limit, from received channel quality indicated value, calculate the bit number that next time slot corresponding with channel quality indicated value can carry successively, determine that minimum channel quality indicated value when bit number that next time slot can carry is greater than the bit number of the business of described first communication equipment current carrying is target channel quality indicated value, determine that the modulating-coding form corresponding with described target channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form.
That is, if the bit number that next time slot calculated based on received channel quality indicated value can carry is greater than the bit number of the business of the current carrying of the first communication equipment, then using the channel quality indicated value that receives as chosen candidate value, and the bit number that calculating can carry based on next time slot that the channel of the channel quality indicated value received and the mathematic interpolation of 1 obtain, if the bit number that next time slot obtained based on the channel of the channel quality indicated value received and the mathematic interpolation of 1 can carry is less than the bit number of the business of the current carrying of the first communication equipment, then using the channel quality indicated value that receives as target channel quality indicated value, if the bit number that next time slot obtained based on the channel of the channel quality indicated value received and the mathematic interpolation of 1 can carry is more than or equal to the bit number of the business of the current carrying of the first communication equipment, then using the channel of channel quality indicated value that receives and 1 difference as chosen candidate value, and the bit number that calculating can carry based on next time slot that the channel of the channel quality indicated value received and the mathematic interpolation of 2 obtain, if the bit number that next time slot obtained based on the channel of the channel quality indicated value received and the mathematic interpolation of 2 can carry is more than or equal to the bit number of the business of the current carrying of the first communication equipment, then using the channel of channel quality indicated value that receives and 2 difference as chosen candidate value, and calculate the bit number that next time slot of obtaining based on channel and 3 mathematic interpolation of the channel quality indicated value received can carry, if the bit number that next time slot obtained based on the channel of the channel quality indicated value received and the mathematic interpolation of 2 can carry is less than the bit number of the business of the current carrying of the first communication equipment, then using the channel of channel quality indicated value that receives and the difference of 1 as target channel quality indicated value.
If the business of the current carrying of the first communication equipment is the business needing to keep constant rate of speed link, with reference to the channel quality indicated value received, and calculate according to the channel quality indicated value that this receives the bit number that next time slot can carry, if the channel quality indicated value received according to this calculates the bit number that bit number that next time slot can carry is more than or equal to the business of the current carrying of the first communication equipment, then determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form, if the channel quality indicated value received according to this calculates the bit number that bit number that next time slot can carry is less than the business of the current carrying of the first communication equipment, then apply for time interval resource, and determine that the modulating-coding form that the channel quality indicated value of current use is corresponding is the modulating-coding form corresponding with determined type of service.Concrete,
If the business of the current carrying of the first communication equipment is the business needing to keep constant rate of speed link, calculate based on received channel quality indicated value the bit number that next time slot can carry;
If the bit number that next time slot calculated based on received channel quality indicated value can carry is less than the bit number of the business of the current carrying of described first communication equipment, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form;
If the bit number that next time slot calculated based on received channel quality indicated value can carry equals the bit number of the business of the current carrying of described first communication equipment, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form;
If the bit number that next time slot calculated based on received channel quality indicated value can carry is greater than the bit number of the business of the current carrying of described first communication equipment, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form, and the business of the current carrying of described first communication equipment and the same time slot of other service integration.
Below in conjunction with simulation result, the embodiment of the present invention is described.
The CQI value definition list that table 1 provides for the embodiment of the present invention, table 2 is the system design parameters used in emulation.In this emulation, CQI value definition defines consistent with MCS value.
Table 1
Table 2
Slot length 3.2ms
Character rate 3.84Msps
A time slot burst number 12
Wireless channel Additive white Gaussian noise awgn channel
Interference type Part frequency hopping frequency is subject to barrage jamming
Interference strength Signal interference ratio-10dB
Frequency interference ratio 17％、33％、50％、58％
Table 2 intermediate-frequeney point interference ratio refers in frequency-hopping system have how many frequencies to be interfered.
Refer to Fig. 6, the throughput changing trend diagram carrying out emulating frequency-hopping system under the different signal to noise ratios of the noiseless situation obtained based on table 1 and table 2 parameter that Fig. 6 provides for the embodiment of the present invention.
Refer to Fig. 7, Fig. 7 provides for the embodiment of the present invention, when the frequency of different proportion is interfered, and the throughput changing trend diagram of frequency-hopping system under different signal to noise ratio.
Refer to Fig. 8, Fig. 8 provides for the embodiment of the present invention, when the frequency of different proportion is interfered, and the error rate changing trend diagram of frequency-hopping system under different signal to noise ratio.
Refer to Fig. 9, Fig. 9 provides for the embodiment of the present invention, when the frequency of different proportion is interfered, and the throughput changing trend diagram of frequency-hopping system.
Refer to Figure 10, Figure 10 provides for the embodiment of the present invention, when the frequency of different proportion is interfered, and the error rate changing trend diagram of frequency-hopping system.
Visible, the channel quality instruction system of selection provided by the embodiment of the present invention and the method for modulating-coding, in cases of a disturbance, along with the increase of signal to noise ratio, the throughput of frequency-hopping system also increases, and the error rate reduces, and ensure that the stable connection of link.
Corresponding with embodiment of the method, the embodiment of the present invention also provides a kind of channel quality to indicate choice device, and a kind of structural representation of the channel quality instruction choice device that the embodiment of the present invention provides as shown in figure 11, can comprise:
Processing module 111 and selection module 112; Wherein,
Processing module, for foundation Received signal strength estimated snr, and adds up the Block Error Rate of actual time window; Received signal strength sends by with the first communication equipment that second communication equipment carries out communicating;
Select module, for based on estimated signal to noise ratio and the Block Error Rate selective channel quality indicated value of actual time window added up.
The channel quality instruction choice device that the embodiment of the present invention provides, consider signal to noise ratio and Block Error Rate selective channel quality indicated value, what selected channel quality instruction better can react channel is disturbed situation, thus make signal sending end after receiving channel quality indicated value, more suitably modulating-coding form can be selected, thus can ensure that link in an interference situation connects.
Optionally, module is selected to comprise:
Determine submodule, for the Block Error Rate determination channel quality indicated value span based on signal to noise ratio and actual time window;
Chooser module, for selective channel quality indicated value from determined channel quality indicated value span.
Optionally, determine that submodule can comprise:
First determining unit, for based on signal to noise ratio, and prestore corresponding with each channel quality indicated value noiseless time Block Error Rate-signal to noise ratio curve, determine corresponding with each channel quality indicated value noiseless time Block Error Rate;
Second determining unit, for determining that from the channel quality indicated value corresponding with the Block Error Rate meeting error block rate requirement maximum channel quality indicated value is the measured value that the channel quality of actual time window indicates;
3rd determining unit, for the Block Error Rate based on actual time window, determine the backoff channel quality indicated value corresponding with the Block Error Rate of actual time window, based on the channel quality indicated value that the modulating-coding form that backoff channel quality indicated value uses by the signal be currently received is corresponding, rollback preset value is determined;
4th determining unit, for determining channel quality indicated value span, channel quality indicated value span comprises: the minimum value CQI of channel quality indicated value min, the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCS, the measured value of the channel quality instruction of actual time window and the backoff channel quality indicated value CQI corresponding with the Block Error Rate of actual time window backoff.
Optionally, the 3rd determining unit specifically may be used for,
If the Block Error Rate of actual time window is less than or equal to the first predetermined threshold value, then corresponding with the Block Error Rate of actual time window backoff channel quality indicated value CQI backofffor: the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCSwith the difference of the first preset value;
If the Block Error Rate of actual time window is greater than the first predetermined threshold value and be less than the second predetermined threshold value, then corresponding with the Block Error Rate of actual time window backoff channel quality indicated value CQI backofffor: the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCSwith the difference of the second preset value;
If the Block Error Rate of actual time window is greater than the second predetermined threshold value, then corresponding with the Block Error Rate of actual time window backoff channel quality indicated value CQI backofffor: the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCSwith the difference of the 3rd preset value;
Wherein, the first predetermined threshold value is less than the second predetermined threshold value; First preset value is less than the second preset value, and the second preset value is less than the 3rd preset value.
Optionally, chooser module specifically may be used for,
If the Block Error Rate of actual time window is zero, judge that the time interval of current time slots apart from a upper time slot of makeing mistakes is whether in effective time interval, if so, the channel quality indicated value CQI that the modulating-coding form then selecting the signal be currently received to use from determined channel quality indicated value span is corresponding mCS; If not, then the measured value CQI selecting the channel quality of actual time window to indicate from determined channel quality indicated value span measure;
If the Block Error Rate of actual time window is non-vanishing, the second efficiency that the first efficiency that relatively measured value of the channel quality instruction of actual time window is corresponding channel quality indicated value corresponding with the modulating-coding form that the signal be currently received uses is corresponding, if the first efficiency is less than the second efficiency, select formula selective channel quality indicated value according to following: CQI select=max{CQI min, min{CQI measure, CQI backof} f; If the first efficiency is greater than described second efficiency, select formula selective channel quality indicated value according to following: CQI select=max{CQI min, CQI backoff;
Wherein, CQI selectfor selected channel quality indicated value.
Corresponding with modulation coding method, the embodiment of the present invention also provides a kind of Adaptive Modulation and Coding device, and a kind of structural representation of the modulating-coding device that the embodiment of the present invention provides as shown in figure 12, can comprise:
Receiver module 121, for being received the channel quality indicated value sent with the second communication equipment that described first communication equipment carries out communicating by feedback channel, channel quality indicated value by second communication equipment foundation Received signal strength estimated snr, and adds up the Block Error Rate of preset time window; Select to determine based on estimated signal to noise ratio and the Block Error Rate of the preset time window added up;
Determination module 122, for the channel quality indicated value determination modulating-coding form that foundation receives;
Modulating-coding module 123, for carrying out modulating-coding based on the modulating-coding form determined to sent signal.
Optionally, determination module can comprise:
First determines submodule, for determining the type of the business of the current carrying of the first communication equipment;
Second determines submodule, for determining the modulating-coding form corresponding with determined type of service according to the channel quality indicated value received.
Optionally, second determines that submodule can comprise:
First determining unit, if the business for the current carrying of the first communication equipment is the business of type of doing one's best, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form.
Optionally, second determines that submodule can comprise:
First computing unit, if be the business high to reliability requirement for the business of the current carrying of the first communication equipment, calculates based on received channel quality indicated value the bit number that next time slot can carry;
Second computing unit, if the bit number that can carry for next time slot calculated based on received channel quality indicated value is less than the bit number of the business of the current carrying of the first communication equipment, calculate the modulating-coding form corresponding with determined type of service;
Second determining unit, if the bit number that can carry for next time slot calculated based on received channel quality indicated value is greater than the bit number of the business of the current carrying of the first communication equipment, with the channel quality indicated value received for the upper limit, from received channel quality indicated value, calculate the bit number that next time slot corresponding with channel quality indicated value can carry successively, determine that minimum channel quality indicated value when bit number that next time slot can carry is greater than the bit number of the business of described first communication equipment current carrying is target channel quality indicated value, determine that the modulating-coding form corresponding with target channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form.
Optionally, second determines that submodule can comprise:
3rd computing unit, if be the business needing to keep constant rate of speed link for the business of the current carrying of the first communication equipment, calculates based on received channel quality indicated value the bit number that next time slot can carry;
4th computing unit, if the bit number that can carry for next time slot calculated based on received channel quality indicated value is less than the bit number of the business of the current carrying of the first communication equipment, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form;
3rd determining unit, if the bit number that can carry for next time slot calculated based on received channel quality indicated value equals the bit number of the business of the current carrying of described first communication equipment, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form;
4th determining unit, if the bit number that can carry for next time slot calculated based on received channel quality indicated value is greater than the bit number of the business of the current carrying of described first communication equipment, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form, and the business of the current carrying of the first communication equipment and the same time slot of other service integration.
Those of ordinary skill in the art can recognize, in conjunction with unit and the algorithm steps of each example of embodiment disclosed herein description, can realize with the combination of electronic hardware or computer software and electronic hardware.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can use distinct methods to realize described function to each specifically should being used for, but this realization should not thought and exceeds scope of the present invention.
Those skilled in the art can be well understood to, for convenience and simplicity of description, the specific works process of the system of foregoing description (if existence), device and unit, with reference to the corresponding process in preceding method embodiment, can not repeat them here.
In several embodiments that the application provides, should be understood that, disclosed system (if existence), apparatus and method, can realize by another way.Such as, device embodiment described above is only schematic, such as, the division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of device or unit or communication connection can be electrical, machinery or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.
If described function using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part of the part that technical scheme of the present invention contributes to prior art in essence in other words or this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform all or part of step of method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only memory (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), magnetic disc or CD etc. various can be program code stored medium.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (20)

1. a channel quality instruction system of selection, is applied to second communication equipment, it is characterized in that, comprising:
According to Received signal strength estimated snr, and add up the Block Error Rate of actual time window; Described Received signal strength sends by with the first communication equipment that described second communication equipment carries out communicating;
Based on the Block Error Rate selective channel quality indicated value of described signal to noise ratio and described actual time window.
2. method according to claim 1, is characterized in that, the described Block Error Rate selective channel quality instruction based on described signal to noise ratio and described actual time window comprises:
Based on the Block Error Rate determination channel quality indicated value span of described signal to noise ratio and described actual time window;
Selective channel quality indicated value from determined channel quality indicated value span.
3. method according to claim 2, is characterized in that, the described Block Error Rate determination channel quality indicated value span based on described signal to noise ratio and described actual time window comprises:
Based on described signal to noise ratio, and prestore corresponding with each channel quality indicated value noiseless time Block Error Rate-signal to noise ratio curve, determine corresponding with each channel quality indicated value noiseless time Block Error Rate;
From the channel quality indicated value corresponding with the Block Error Rate meeting error block rate requirement, determine that maximum channel quality indicated value is the measured value of the channel quality instruction of actual time window;
Based on the Block Error Rate of described actual time window, determine the backoff channel quality indicated value corresponding with the Block Error Rate of described actual time window, based on the channel quality indicated value that the modulating-coding form that described backoff channel quality indicated value uses by the signal be currently received is corresponding, rollback preset value is determined;
Determine channel quality indicated value span, described channel quality indicated value span comprises: the minimum value CQI of channel quality indicated value min, the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCS, the measured value CQI of the channel quality instruction of described actual time window measure, and the backoff channel quality indicated value CQI that the Block Error Rate of described and described actual time window is corresponding backoff.
4. method according to claim 3, is characterized in that, the described Block Error Rate based on described actual time window, determines that the backoff channel quality indicated value corresponding with the Block Error Rate of described actual time window comprises:
If the Block Error Rate of described actual time window is less than or equal to the first predetermined threshold value, then corresponding with the Block Error Rate of described actual time window backoff channel quality indicated value CQI backofffor: the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCSwith the difference of the first preset value;
If the Block Error Rate of described actual time window is greater than described first predetermined threshold value and is less than the second predetermined threshold value, then corresponding with the Block Error Rate of described actual time window backoff channel quality indicated value CQI backofffor: the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCSwith the difference of the second preset value;
If the Block Error Rate of described actual time window is greater than described second predetermined threshold value, then corresponding with the Block Error Rate of described actual time window backoff channel quality indicated value CQI backofffor: the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCSwith the difference of the 3rd preset value;
Wherein, described first predetermined threshold value is less than described second predetermined threshold value; Described first preset value is less than described second preset value, and described second preset value is less than described 3rd preset value.
5. method according to claim 3, is characterized in that, described from determined channel quality indicated value span selective channel quality indicated value comprise:
If the Block Error Rate of described actual time window is zero, judge that the time interval of current time slots apart from a upper time slot of makeing mistakes is whether in effective time interval, if so, the channel quality indicated value CQI that the modulating-coding form that the signal be currently received described in then selecting from determined channel quality indicated value span uses is corresponding mCS; If not, then from determined channel quality indicated value span, select the measured value CQI that the channel quality of described actual time window indicates measure;
If the Block Error Rate of described actual time window is non-vanishing, the second efficiency that first efficiency corresponding to measured value of the channel quality instruction of the more described actual time window channel quality indicated value corresponding with the modulating-coding form that the described signal be currently received uses is corresponding, if described first efficiency is less than described second efficiency, select formula selective channel quality indicated value according to following: CQI select=max{CQI min, min{CQI measure, CQI backoff; If described first efficiency is greater than described second efficiency, select formula selective channel quality indicated value according to following: CQI select=max{CQI min, CQI backoff;
Wherein, CQI selectfor selected channel quality indicated value.
6. an adaptive modulation coding method, is applied to the first communication equipment, it is characterized in that, comprising:
The channel quality indicated value sent with the second communication equipment that described first communication equipment carries out communicating is received by feedback channel, described channel quality indicated value by described second communication equipment foundation Received signal strength estimated snr, and adds up the Block Error Rate of preset time window; Block Error Rate based on described signal to noise ratio and described preset time window is selected to determine;
According to the channel quality indicated value determination modulating-coding form received;
Modulating-coding is carried out to sent signal based on the described modulating-coding form determined.
7. method according to claim 6, is characterized in that, the channel quality indicated value determination modulating-coding form that described foundation receives comprises:
Determine the type of the business of the current carrying of described first communication equipment;
The modulating-coding form corresponding with determined type of service is determined according to the channel quality indicated value received.
8. method according to claim 7, is characterized in that, the channel quality indicated value that described foundation receives determines that the modulating-coding form corresponding with determined type of service comprises:
If the business of the current carrying of described first communication equipment is the business of type of doing one's best, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form.
9. method according to claim 7, is characterized in that, the channel quality indicated value that described foundation receives determines that the modulating-coding form corresponding with determined type of service comprises:
If the business of the current carrying of described first communication equipment is the business high to reliability requirement, calculate based on received channel quality indicated value the bit number that next time slot can carry;
If the bit number that next time slot calculated based on received channel quality indicated value can carry is less than the bit number of the business of the current carrying of described first communication equipment, calculate the modulating-coding form corresponding with determined type of service;
If the bit number that next time slot calculated based on received channel quality indicated value can carry is greater than the bit number of the business of the current carrying of described first communication equipment, with the channel quality indicated value received for the upper limit, from received channel quality indicated value, calculate the bit number that next time slot corresponding with channel quality indicated value can carry successively, determine that minimum channel quality indicated value when bit number that next time slot can carry is greater than the bit number of the business of described first communication equipment current carrying is target channel quality indicated value, determine that the modulating-coding form corresponding with described target channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form.
10. method according to claim 7, is characterized in that, the channel quality indicated value that described foundation receives determines that the modulating-coding form corresponding with determined type of service comprises:
If the business of the current carrying of described first communication equipment is the business needing to keep constant rate of speed link, calculate based on received channel quality indicated value the bit number that next time slot can carry;
If the bit number that next time slot calculated based on received channel quality indicated value can carry is less than the bit number of the business of the current carrying of described first communication equipment, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form;
If the bit number that next time slot calculated based on received channel quality indicated value can carry equals the bit number of the business of the current carrying of described first communication equipment, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form;
If the bit number that next time slot calculated based on received channel quality indicated value can carry is greater than the bit number of the business of the current carrying of described first communication equipment, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form, and the business of the current carrying of described first communication equipment and the same time slot of other service integration.
11. 1 kinds of channel quality instruction choice devices, are applied to second communication equipment, it is characterized in that, comprising:
Processing module, for foundation Received signal strength estimated snr, and adds up the Block Error Rate of actual time window; Described Received signal strength sends by with the first communication equipment that described second communication equipment carries out communicating;
Select module, for the Block Error Rate selective channel quality indicated value based on described signal to noise ratio and described actual time window.
12. devices according to claim 11, is characterized in that, described selection module comprises:
Determine submodule, for the Block Error Rate determination channel quality indicated value span based on described signal to noise ratio and described actual time window;
Chooser module, for selective channel quality indicated value from determined channel quality indicated value span.
13. devices according to claim 12, is characterized in that, determine that submodule comprises:
First determining unit, for based on described signal to noise ratio, and prestore corresponding with each channel quality indicated value noiseless time Block Error Rate-signal to noise ratio curve, determine corresponding with each channel quality indicated value noiseless time Block Error Rate;
Second determining unit, for determining that from the channel quality indicated value corresponding with the Block Error Rate meeting error block rate requirement maximum channel quality indicated value is the measured value that the channel quality of actual time window indicates;
3rd determining unit, for the Block Error Rate based on described actual time window, determine the backoff channel quality indicated value corresponding with the Block Error Rate of described actual time window, based on the channel quality indicated value that the modulating-coding form that described backoff channel quality indicated value uses by the signal be currently received is corresponding, rollback preset value is determined;
4th determining unit, for determining described channel quality indicated value span, described channel quality indicated value span comprises: the minimum value CQI of channel quality indicated value min, the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCS, the measured value CQI of the channel quality instruction of described actual time window measure, and the backoff channel quality indicated value CQI that the Block Error Rate of described and described actual time window is corresponding backoff.
14. devices according to claim 13, is characterized in that, described 3rd determining unit specifically for,
If the Block Error Rate of described actual time window is less than or equal to the first predetermined threshold value, then corresponding with the Block Error Rate of described actual time window backoff channel quality indicated value CQI backofffor: the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCSwith the difference of the first preset value;
If the Block Error Rate of described actual time window is greater than described first predetermined threshold value and is less than the second predetermined threshold value, then corresponding with the Block Error Rate of described actual time window backoff channel quality indicated value CQI backofffor: the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCSwith the difference of the second preset value;
If the Block Error Rate of described actual time window is greater than described second predetermined threshold value, then corresponding with the Block Error Rate of described actual time window backoff channel quality indicated value CQI backofffor: the channel quality indicated value CQI that the modulating-coding form that the signal be currently received uses is corresponding mCSwith the difference of the 3rd preset value;
Wherein, described first predetermined threshold value is less than described second predetermined threshold value; Described first preset value is less than described second preset value, and described second preset value is less than described 3rd preset value.
15. devices according to claim 13, is characterized in that, described chooser module specifically for,
If the Block Error Rate of described actual time window is zero, judge that the time interval of current time slots apart from a upper time slot of makeing mistakes is whether in effective time interval, if so, the channel quality indicated value CQI that the modulating-coding form that the signal be currently received described in then selecting from determined channel quality indicated value span uses is corresponding mCS; If not, then from determined channel quality indicated value span, select the measured value CQI that the channel quality of described actual time window indicates measure;
If the Block Error Rate of described actual time window is non-vanishing, the second efficiency that first efficiency corresponding to measured value of the channel quality instruction of the more described actual time window channel quality indicated value corresponding with the modulating-coding form that the described signal be currently received uses is corresponding, if described first efficiency is less than described second efficiency, select formula selective channel quality indicated value according to following: CQI select=max{CQI min, min{CQI measure, CQI backoff; If described first efficiency is greater than described second efficiency, select formula selective channel quality indicated value according to following: CQI select=max{CQI min, CQI backoff;
Wherein, CQI selectfor selected channel quality indicated value.
16. 1 kinds of Adaptive Modulation and Coding devices, are applied to the first communication equipment, it is characterized in that, comprising:
Receiver module, for being received the channel quality indicated value sent with the second communication equipment that described first communication equipment carries out communicating by feedback channel, described channel quality indicated value by described second communication equipment foundation Received signal strength estimated snr, and adds up the Block Error Rate of preset time window; Block Error Rate based on described signal to noise ratio and described preset time window is selected to determine;
Determination module, for the channel quality indicated value determination modulating-coding form that foundation receives;
Modulating-coding module, for carrying out modulating-coding based on the described modulating-coding form determined to sent signal.
17. devices according to claim 16, is characterized in that, described determination module comprises:
First determines submodule, for determining the type of the business of the current carrying of described first communication equipment;
Second determines submodule, for determining the modulating-coding form corresponding with determined type of service according to the channel quality indicated value received.
18. devices according to claim 17, is characterized in that, described second determines that submodule comprises:
First determining unit, if the business for the current carrying of described first communication equipment is the business of type of doing one's best, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form.
19. devices according to claim 17, is characterized in that, described second determines that submodule comprises:
First computing unit, if be the business high to reliability requirement for the business of the current carrying of described first communication equipment, calculates based on received channel quality indicated value the bit number that next time slot can carry;
Second computing unit, if the bit number that can carry for next time slot calculated based on received channel quality indicated value is less than the bit number of the business of the current carrying of described first communication equipment, calculate the modulating-coding form corresponding with determined type of service;
Second determining unit, if the bit number that can carry for next time slot calculated based on received channel quality indicated value is greater than the bit number of the business of the current carrying of described first communication equipment, with the channel quality indicated value received for the upper limit, from received channel quality indicated value, calculate the bit number that next time slot corresponding with channel quality indicated value can carry successively, determine that minimum channel quality indicated value when bit number that next time slot can carry is greater than the bit number of the business of described first communication equipment current carrying is target channel quality indicated value, determine that the modulating-coding form corresponding with described target channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form.
20. devices according to claim 17, is characterized in that, described second determines that submodule comprises:
3rd computing unit, if be the business needing to keep constant rate of speed link for the business of the current carrying of described first communication equipment, calculates based on received channel quality indicated value the bit number that next time slot can carry;
4th computing unit, if the bit number that can carry for next time slot calculated based on received channel quality indicated value is less than the bit number of the business of the current carrying of described first communication equipment, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form;
3rd determining unit, if the bit number that can carry for next time slot calculated based on received channel quality indicated value equals the bit number of the business of the current carrying of described first communication equipment, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form;
4th determining unit, if the bit number that can carry for next time slot calculated based on received channel quality indicated value is greater than the bit number of the business of the current carrying of described first communication equipment, determine that the modulating-coding form corresponding with received channel quality indicated value is the modulating-coding form corresponding with determined type of service according to predetermined channel quality indicated value and the corresponding relation of modulating-coding form, and the business of the current carrying of described first communication equipment and the same time slot of other service integration.
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