CN101207461B - Method and apparatus for self-adapting regulation of threshold value - Google Patents
Method and apparatus for self-adapting regulation of threshold value Download PDFInfo
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Abstract
The embodiment of the invention discloses an adaptive threshold adjusting method. The method includes the steps of acquiring the reception information of adata packet; adjusting a threshold according to the adjustment method corresponding to the reception information of the data packet, and taking the adjusted threshold as the current threshold. The invention also discloses an adaptive threshold adjusting device. The adoption of the invention can implement adaptive threshold adjustment, can ensure the control operation implemented on the basis of the threshold to adapt to the requirement of the fast-changing wireless circumstance, and can improve the communication quality.
Description
Technical field
The present invention relates to control technology, the method and apparatus that particularly a kind of threshold value self adaptation is adjusted.
Background technology
IEEE 802.16e agreement makes uses a terminal to realize that enjoying the WiMAX access service at any time and any place becomes possibility, based on the system of Worldwide microwave inter-operative forum (WIMAX, Worldwide Interoperability for Microwave Access Forum) of IEEE 802.16e agreement once the focus that receives much concern occurring becoming.Key technology is mixed automatic request retransmission (HARQ, HybridAutomatic Repeat Request) and Adaptive Modulation and Coding (AMC, Adaptive Modulationand Coding) etc., make the WIMAX system realize the further raising of main performances such as speed, throughput and capacity.
In the WIMAX system, control operations such as AMC control and power control all need relate to the use of threshold value.Be controlled to be example with AMC, at down direction, promptly by base station (BS, Base Station) when travelling carriage (MS, Mobile Station) sends packet, need carry out descending AMC control, at up direction, be MS when BS sends packet, need carry out up AMC control, the basic principle of AMC is exactly the modulation coding mode of control data transmission.The threshold value of using in the AMC control at present is the fixed gate limit value, uses the needs that the fixed gate limit value can not adapt to fast-changing wireless channel.
Be controlled to be example with descending AMC, following two kinds of thinkings that realize descending AMC control be provided in the IEEE 802.16e agreement:
1) the AMC control that realizes by MS, MS selects downlink modulation coding mode (MCS according to the AMC threshold value, Modulation and Coding Scheme), and by effective carrier-in-interference noise ratio (Effective CINR, Effective Carrier to interference and noise ratio) measured value is informed the selected MCS mode of BS, and the modulation coding mode of stipulating in the MCS mode that BS uses MS to select carries out transfer of data;
2) the AMC control that realizes by BS, MS reports physics CINR (Physical CINR) measured value to BS, BS selects the MCS mode according to this measured value that reports and AMC threshold value, carries out transfer of data according to the modulation coding mode of stipulating in the MCS mode of self selecting then.
In the above-mentioned existing protocol, the thinking that only provides usage threshold value how to be correlated with control operation, what use in this thinking is fixing AMC threshold value, do not relate to the threshold value self adaptation and adjust according to what standard, and the self adaptation adjustment that how to realize threshold value.
More than be controlled to be example with AMC, illustrated that in existing scheme adopt the implementation of fixed gate limit value in the relevant control, the requirement that this will cause can't adapting to based on the control operation that the fixed gate limit value is carried out fast-changing wireless environment has reduced communication quality.
The method that the embodiment of the invention provides a kind of threshold value self adaptation to adjust, this method can realize the adjustment of threshold value self adaptation, makes the control operation of carrying out based on threshold value can adapt to the requirement of wireless environment, improves communication quality.
The device that the embodiment of the invention provides a kind of threshold value self adaptation to adjust, this device can be realized the adjustment of threshold value self adaptation, makes the control operation of carrying out based on threshold value can adapt to the requirement of wireless environment, improves communication quality.
The technical scheme of the embodiment of the invention is achieved in that
The method that a kind of threshold value self adaptation is adjusted, the default step-length Step_size that adjusts wraps number scale value PER_Target with mistake, and establishing current mistake, to wrap number be that Bad_Packet_Num, current correct data bag number are Good_Packet_Num, then lifting step-length is that Step_up=Bad_Packet_Num * (Step_size-PER_Target * Step_size), the reduction step-length is Step_down=Good_Packet_Num * PER_Target * Step_size; This method comprises:
Obtain the information of packet reception condition, comprise: the Negative Acknowledgement nack message number of times of statistical data packet, the packet number that described nack message number of times is arrived default maximum retransmission is wrapped number as mistake, and described nack message number of times is not reached the packet number of default maximum retransmission as correct data bag number;
Threshold value is adjusted, being comprised: if the transmission of free of data bag increases by 0 to threshold value; Or if data packet transmission is arranged, and current existence mistake bag, to the described lifting step-length of threshold value lifting; Or if data packet transmission is arranged, and the current mistake bag that do not exist, threshold value is reduced described reduction step-length;
With adjusted threshold value as current threshold value.
The device that a kind of threshold value self adaptation is adjusted, the default step-length Step_size that adjusts wraps number scale value PER_Target with mistake, and establishing current mistake, to wrap number be that Bad_Packet_Num, current correct data bag number are Good_Packet_Num, then lifting step-length is that Step_up=Bad_Packet_Num * (Step_size-PER_Target * Step_size), the reduction step-length is Step_down=Good_Packet_Num * PER_Target * Step_size; This device comprises:
The information acquisition module comprises: second performance element is used for the Negative Acknowledgement nack message number of times of statistical data packet; Second computing unit, be used for that the nack message number of times that described second performance element is added up is reached the packet number of presetting maximum retransmission and wrap number, described nack message number of times is not reached the packet number of default maximum retransmission as current correct data bag number as current mistake;
The information acquisition module comprises: second performance element is used for the Negative Acknowledgement nack message number of times of statistical data packet; Second computing unit, be used for that the nack message number of times that described second performance element is added up is reached the packet number of presetting maximum retransmission and wrap number, described nack message number of times is not reached the packet number of default maximum retransmission as current correct data bag number as current mistake;
Adjusting module comprises: the 3rd identifying unit, be used to judge current whether have data packet transmission and the current mistake bag that whether exists, and draw result of determination; The 3rd adjusts performance element, and being used for increases by 0 if the result of determination of described the 3rd identifying unit is current free of data bag transmission to threshold value; Perhaps the result of determination as if described the 3rd identifying unit is the current data packet transmission that has, and has the mistake bag, to the described lifting step-length of threshold value lifting; Perhaps the result of determination as if described the 3rd identifying unit is the current data packet transmission that has, and does not have the mistake bag, and threshold value is reduced described reduction step-length; With adjusted threshold value as current threshold value.
As seen, the method and apparatus that the threshold value self adaptation that the embodiment of the invention provides is adjusted, after the information of obtaining the packet reception condition, adjustment mode according to the information correspondence of described packet reception condition, threshold value is adjusted, with adjusted threshold value as current threshold value, thereby information based on the packet reception condition of obtaining, realized self adaptation adjustment to threshold value, thereby make the control operation of carrying out based on this self adaptation adjustment threshold value can adapt to the requirement of fast-changing wireless environment, improve communication quality.
Description of drawings
Fig. 1 is the method flow diagram that embodiment of the invention threshold value self adaptation is adjusted;
Fig. 2 carries out the flow chart that the threshold value self adaptation is adjusted for the embodiment of the invention based on ACK and nack message;
Fig. 3 carries out the flow chart that the threshold value self adaptation is adjusted for the embodiment of the invention based on average repeat time;
Fig. 4 wraps number for the embodiment of the invention based on current mistake and current correct data bag number carries out the schematic diagram that the threshold value self adaptation is adjusted;
Fig. 5 wraps number for the embodiment of the invention based on current mistake and current correct data bag number carries out the flow chart that the threshold value self adaptation is adjusted;
Fig. 6 is the flow chart of method first instantiation of embodiment of the invention threshold value self adaptation adjustment;
Fig. 7 is the flow chart of method second instantiation of embodiment of the invention threshold value self adaptation adjustment;
Fig. 8 is the apparatus structure schematic diagram that embodiment of the invention threshold value self adaptation is adjusted;
Fig. 9 is that the device of embodiment of the invention threshold value self adaptation adjustment is applied in the schematic diagram in the ARQ/HARQ system.
Embodiment
For the purpose and the advantage that make the embodiment of the invention is clearer, the embodiment of the invention is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is the method flow diagram that embodiment of the invention threshold value self adaptation is adjusted, and this flow process comprises:
Step 101: the information of obtaining the packet reception condition.
Step 102: the adjustment mode according to the information correspondence of described packet reception condition is adjusted threshold value, with adjusted threshold value as current threshold value.
The method that embodiment of the invention threshold value self adaptation is adjusted, after the information of obtaining the packet reception condition, adjustment mode according to obtaining information correspondence is adjusted threshold value, with adjusted threshold value as current threshold value, thereby information based on the packet reception condition of obtaining, realized self adaptation adjustment, thereby made the control operation of carrying out based on this self adaptation adjustment threshold value can adapt to the requirement of wireless environment, improved communication quality threshold value.
In the embodiment of the invention, in above-mentioned steps 101, the information of packet reception condition can include but not limited to following multiple situation, and for example ACK or nack message or average repeat time or mistake are wrapped number etc., the means of obtaining these information also can have multiple, hereinafter will provide detailed description.
In above-mentioned steps 102, according to the adjustment mode of the information correspondence of packet reception condition threshold value to be adjusted, described adjustment mode also can have multiple mode, hereinafter will provide detailed description.
In the embodiment of the invention, after above-mentioned steps 102, after promptly threshold value being adjusted,, can further include the concrete control operation step of AMC control or power control etc. in conjunction with concrete application scenarios.
Be controlled to be example with AMC below, describe in detail respectively in the method that the embodiment of the invention provides, feedback mechanism, information are obtained, the threshold value self adaptation is adjusted mode, adjust the embodiment of the control operation of threshold value based on self adaptation.
1) ARQ/HARQ feedback mechanism
At automatic request retransmission (ARQ, Automatic Repeat Request) in the technology, transmitting terminal to receiving terminal send can error detection packet, receiving terminal receives that the back is according to coding rule, in the packet that judgement is received inerrancy is arranged, and by feedback information court verdict is fed back to transmitting terminal, transmitting terminal is according to the court verdict in the feedback information, receiving terminal is thought that vicious packet sends to receiving terminal again, till receiving terminal praises.
The HARQ technology is based on a kind of expansion of above-mentioned ARQ technology, receiving terminal to the packet that receives decode earlier, process recovery data packets such as error correction, merging, if the mistake in the energy correction of data bag is then accepted this packet, to transmitting terminal feedback acknowledgment (ACK, Acknowledgement) information, (transmitting terminal will carry out the re-transmission of misdata bag for NACK, NegativeAcknowledgement) information at the Negative Acknowledgement of this packet otherwise to transmitting terminal feedback.Therefore, the HARQ technology has increased error correction with respect to the ARQ technology.
2) Information Statistics
Based on the selected ARQ/HARQ feedback mechanism of the embodiment of the invention, the information of obtaining the packet reception condition can include but not limited to: send the sum of packet or correctly send the number of packet or send ACK information and the number of times of nack message or the number of retransmissions of each packet etc. that feed back behind each packet.Be understandable that the information of obtaining the packet reception condition also is not limited to above-mentioned list several, can obtain according to actual needs and be different from above-mentioned other information of enumerating.
Can also utilize the above-mentioned information of obtaining, calculate average repeat time or mistake and wrap number etc. follow-up threshold value self adaptation is adjusted other useful statistical informations.Wherein, average repeat time is defined by following formula:
Send the sum of packet between the number of retransmissions that increases between average repeat time=twice statistics/twice statistics.
The number of retransmissions that increases between twice statistics in the following formula refers to the number of times that packet retransmits between twice statistics, can comprise the total degree that several packets retransmit.Average repeat time is meant, between twice statistics in following formula, the number of retransmissions of current data packet and the number of retransmissions of previous or preceding several packets is averaged, and obtains average repeat time.The concrete statistics number that is comprised can specifically be determined according to actual conditions, selects number can avoid the influence of bursty interference for a long time, selects number variations to be had susceptibility preferably after a little while.Based on the application of this average repeat time, can also when obtaining information, write down the pairing data frame number of the information of obtaining, help like this checking more flexibly whether current statistics has satisfied determined in advance number.For example, after current statistics begins,, check every n Frame whether the data that receive have satisfied the statistics number by the data frame number of record, if satisfy then can average the calculating of number of retransmissions, said n can be determined different values as required.
If the nack message of a certain packet has reached maximum retransmission N, show that then receiving terminal has received error data packets N time, again because transmitting terminal judges that this packet has reached maximum retransmission and just no longer sent, just can know this packet error according to this information, therefore wrapping number can be defined by following formula by mistake: mistake is wrapped number=NACK number and is reached the number of the packet of maximum retransmission.Correspondingly, correctly receive number-of-packet=NACK number and do not reach the number of the packet of maximum retransmission.
3) the threshold value self adaptation is adjusted mode
AMC control is divided into M MCS grade, the corresponding a kind of MCS mode of each grade, grade is expressed as MCS from low to high respectively
1, MSC
2... MCS
M, the AMC control gate limit value of each MCS grade correspondence be respectively T (1), T (2) ... T (M).Select the MCS mode of a certain grade, just be equivalent to transmitting terminal when transfer of data, need to carry out transfer of data according to the modulation coding mode of this MCS mode defined.
In the embodiment of the invention, the threshold value self adaptation is adjusted mode can comprise following three kinds:
1. carry out the adjustment of threshold value self adaptation according to ACK information or nack message.Default maximum times, adjustment step-length δ
UPWith adjustment step-length δ
Down, carrying out the adaptive threshold adjustment according to ACK information or nack message, Fig. 2 shows the flow process of this method of adjustment.When the NACK feedback information appears in a certain packet first, begin to add up since 0 to the continuous error statistics counting of this packet.Flow process shown in Figure 2 comprises:
Step 201: statistics ACK or nack message.
Step 202: judge whether statistical information is nack message, if, continue execution in step 203, otherwise direct execution in step 205.
Step 203: whether the continuous error statistics counting of judging the nack message correspondence reaches default maximum times, if, continue execution in step 204, otherwise direct execution in step 205.
Step 204: with the AMC threshold T (1) of each grade correspondence, T (2) ... T (M) raises one and adjusts step-length δ
UP, finish the flow process that the threshold value self adaptation is adjusted.
Step 205: with the AMC threshold T (1) of each grade correspondence, T (2) ... T (M) reduces a step-length δ
Down
After finishing through above-mentioned steps 204 or step 205, just can obtain passing through the AMC threshold value of each MCS grade of the adjusted correspondence of self adaptation, with adjusted threshold value as current threshold value.
Above-mentioned at be the situation that receiving terminal once receives only a packet, suppose to exist receiving terminal once to receive the situation of several packets, then carry out step 201 according to the method described above respectively～step 203 at different packets, if have the continuous statistical counting of nack message of a packet to reach default maximum times in these several packets, then execution in step 204 after step 203.
2. carry out the adjustment of threshold value self adaptation according to average repeat time.Goal-selling number of retransmissions, adjustment step-length δ
UPWith adjustment step-length δ
Down, according to the average repeat time that counts threshold value being carried out the self adaptation adjustment, Fig. 3 shows the flow process of this method of adjustment, and this flow process comprises:
Step 301: statistical average number of retransmissions.
Step 302: obtain the target number of retransmissions, judge whether the average repeat time that calculates is higher than the target number of retransmissions, if, continue execution in step 303, otherwise direct execution in step 304.
Step 303: with the AMC of each grade correspondence control threshold T (1), T (2) ... T (M) raises one and adjusts step-length δ
UP, process ends.
Step 304: with the AMC of each grade correspondence control threshold T (1), T (2) ... T (M) reduces by one and adjusts step-length δ
Down
Similarly, after finishing through above-mentioned steps 303 or step 304, just can obtain passing through the AMC threshold value of each MCS grade of the adjusted correspondence of self adaptation, with adjusted threshold value as current threshold value.
3. wrap number according to current mistake and current correct data bag number carries out the adjustment of threshold value self adaptation.Mistake can be set wraps number scale value, lifting step-length and reduces step-length, when current wrong bag, lifting step-length to a setting of threshold value lifting, current when not wrapping by mistake, threshold value is reduced the reduction step-length of a setting, if current do not have a transfer of data, then do not promote yet and do not descend, it is constant to keep threshold value.
At above-mentioned implementation, can take a kind of preferred implementation, it is PER_Target that the desired value of by mistake wrapping number is set, and the adjustment step-length is Step_size, and unit is dB.If current wrong bag, then calculate big step-length lifting according to Step_size, if the current bag that misses, then calculating a less step-length according to Step_size reduces, if there is not packet to transmit, then do not promote yet and do not descend, it is constant to keep threshold value, promptly in this better embodiment, the lifting step-length and reduce step-length according to adjust step-length, current mistake wraps number or current correct data bag number calculates in real time.Can use following false code to describe in this better embodiment, use current mistake to wrap number and current correct data bag number and carry out the process that the threshold value self adaptation is adjusted.Suppose that each carries out the self adaptation adjustment of AMC control thresholding constantly, wherein i represents current time, i-1 represents i previous moment constantly, the corresponding constantly threshold value of T_target (i) expression i, Step_up represents the step value of lifting, Step_down represents that the step value that reduces, Bad_Packet_Num represent that current mistake wraps number, and Good_Packet_Num represents current correct data bag number.
IF No Data Packet; The free of data bag
Step_size is 0; Do not promote step-length during the free of data bag and do not reduce step-length yet
T_target (i)=T_target (i-1); I threshold value constantly equals i-1 threshold value constantly
ELSE IF ERRPR Packet/PDU number is greater than 0; Wrong bag
Step_up=Bad_Packet_Num (Step_size-PER_target*Step_size); The lifting step-length
T_target (i)=T_target (i-1)+Step_up; I threshold value constantly equals the step-length that i-1 moment threshold value adds lifting
ELSE; The packet number of errorless bag
Step_down=Good_Packet_Num*PER_target*Step_size; Reduce step-length
T_target (i)=T_target (i-1)-Step_down; I threshold value constantly equals the step-length that i-1 moment threshold value deducts reduction
Fig. 4 wraps number for the current mistake of above-mentioned use and correct data bag number carries out the method schematic diagram that the threshold value self adaptation is adjusted, wherein transverse axis represents that the longitudinal axis is represented the threshold value adjusted value constantly, and the G sign of indicating on the transverse axis reduces step-length, B sign lifting step-length, the N sign does not have operation.Fig. 5 shows above-mentioned use mistake and wraps the method flow that number carries out the adaptive threshold adjustment, and this flow process comprises:
Step 501: add up current mistake and wrap number and current correct data bag number statistics.
Step 502: obtain the desired value that mistake is wrapped number.
Step 503: judge the current data packet transmission that whether has,, otherwise carry out 505 if do not have then execution in step 504.
Step 504: step value is being changed to 0, and execution in step 508 then.
Step 505: judge that whether current mistake wrap number greater than 0, promptly current whether wrong bag, if not, execution in step 506, otherwise direct execution in step 507.
Step 506: calculate the step value that needs reduction, execution in step 508 then.
Step 507: calculate the step value that needs lifting.
Step 508:, calculate the AMC threshold value of current each grade correspondence according to the step value that calculates.
After above-mentioned steps 508, just can obtain adjusted AMC threshold value.
More than introduce three kinds of modes that the threshold value self adaptation is adjusted, obtained the information of different packet reception conditions, can use corresponding different threshold values to adjust mode.Adjustment mode according to obtaining information correspondence is adjusted threshold value, with adjusted threshold value as current threshold value, thereby information based on the packet reception condition of obtaining, realized self adaptation adjustment to threshold value, thereby make the control operation of carrying out based on this self adaptation adjustment threshold value can adapt to the requirement of wireless environment, improve communication quality.
4. AMC control
Suppose AMC control is divided into 1～M MCS grade, the AMC control gate limit value of corresponding grade i is T (i), and the value of i according to physics CINR measured value, can realize selecting different MCS modes from 1 to M.If physics CINR measured value satisfies T (i)＜=CINR＜T (i+1), then T (i) is as the AMC threshold value, and corresponding MCS (i) is chosen as the MCS mode; If physics CINR measured value satisfies CINR＜=T (1), then select T (1) as the AMC threshold value, corresponding MCS (1) is chosen as the MCS mode; If physics CINR measured value satisfies CINR＞=T (M), select T (M) as the AMC threshold value, corresponding MCS (M) is chosen as the MCS mode.
After selecting new MCS mode, the coding demodulator that can control transmitting terminal adopts new MCS mode to send packet to receiving terminal.
Be concrete application scenarios with the WIMAX system below, enumerate two instantiations of the descending AMC control that realizes by BS and MS in the embodiment of the invention.
The flow chart of method first instantiation that Fig. 6 provides for the embodiment of the invention in this instantiation, is described the descending AMC control that is realized by BS, and the MCS grade is divided in control at AMC equally, and each grade is to there being the AMC threshold value.Flow process shown in Figure 6 comprises:
Step 601:BS sends downlink data packet by eating dishes without rice or wine to MS.
Step 602:MS is according to the reception condition of downlink data packet, by the ACK or the nack message of eating dishes without rice or wine in BS feedback ARQ/HARQ.
Step 603:MS is to BS feeding back downlink physics CINR measured value.
The needs that step 604:BS adjusts according to the threshold value self adaptation obtain ACK or the NACK message of ARQ/HARQ, or obtain average repeat time or miss the information of wrapping Data Receiving situations such as number, carry out the self adaptation adjustment of AMC threshold value according to the information of obtaining.The obtaining and the self adaptation adjustment of threshold value carried out by BS of above-mentioned information, the concrete mode of execution can be identical with the aforementioned mode of specifically introducing, information obtain specific implementation the time, only need to adopt an a kind of mode wherein to get final product.
Step 605:BS uses the adjusted AMC threshold value of self adaptation, in conjunction with the physics CINR measured value of MS feedback, selects the MCS mode again.
Through after this step, BS can use the modulation coding mode of the MCS mode defined of above-mentioned selection, and simultaneously the MCS mode of selecting be informed MS next time to MS transmission downlink data packet the time, make MS when receiving downlink data packet, can decode according to the MCS mode.BS sends downlink data packet and the MCS mode can distribute description (DL-MAP, Downlink band width allocation Map) message to realize by the downlink bandwidth in the existing protocol.
Above-mentioned steps 602 and step 603 there is no strict ordinal relation, also can be to carry out simultaneously.
What above-mentioned first kind of instantiation shown in Figure 6 described is the descending AMC control that realizes by BS, is understandable that the method that the embodiment of the invention provides can be applied in the scene of up AMC control equally.In the scene of up AMC control, MS at first sends the upstream data bag by eating dishes without rice or wine to BS, BS obtains the information of Data Receiving situation then, for example ACK or NACK message, or average repeat time, or mistake is wrapped number etc., AMC value thresholding is carried out the self adaptation adjustment, select desired MCS mode in conjunction with the physics CINR measured value of self measuring again, can distribute by the existing message upstream bandwidth of existing protocol and describe (UL-MAP, Uplink band width allocation Map) message is informed the MCS mode that MS self is desired, MS sends packet according to the modulation coding mode of the MCS mode defined of BS appointment, and promptly MS carries out the modulation coding mode of stipulating in the MCS mode of BS selection.
Method first instantiation that embodiment of the invention threshold value self adaptation is adjusted, the upstream or downstream AMC that realizes at BS controls, information based on the packet reception condition of obtaining, realized self adaptation adjustment to the AMC threshold value, thereby make the AMC control of carrying out based on the AMC threshold value of this self adaptation adjustment can adapt to the requirement of wireless environment, improve communication quality.
The flow chart of method second instantiation that Fig. 7 provides for the embodiment of the invention in this instantiation, is described the descending AMC control that is realized by MS, and the MCS grade is divided in control at AMC equally, and each grade is to there being the AMC threshold value.Flow process shown in Figure 7 comprises:
Step 701:BS sends downlink data packet by eating dishes without rice or wine to MS.
Step 702:MS is according to the reception condition of downlink data packet, draw the ARQ/HARQ feedback information, obtain ACK or nack message or average repeat time or miss information such as wrapping number, AMC control gate limit value is carried out the self adaptation adjustment, similarly, the concrete mode of obtaining with the self adaptation adjustment of threshold value of above-mentioned information can be identical with the aforementioned mode of specifically introducing, information obtain specific implementation the time, only need to adopt an a kind of mode wherein to get final product.
Step 703:MS uses the adjusted AMC threshold value of self adaptation, selects desired MCS mode in conjunction with physics CINR measured value again.
Step 704:MS is by eating dishes without rice or wine to BS feeding back ACK or nack message.
Step 705:MS is encoded into effective CINR with desired MCS mode, feed back to BS by eating dishes without rice or wine, can indicate feedback channel (CQICH, Channel Quality InformationChannel) or other modes that effective CINR is fed back to BS by channel quality.
Step 706:BS directly carries out data packet transmission according to the entrained MCS mode of effective CINR of MS feedback.
Above-mentioned steps 704 and step 705 there is no strict ordinal relation, also can carry out simultaneously.
Though the above instantiation of lifting all is to be controlled to be example with AMC, be understandable that in other needed control operation that the usage threshold value carries out, the mode of its threshold value self adaptation adjustment still can be used mode cited in the above-mentioned instantiation.For example in the control of the power in the WIMAX system, above-mentioned threshold value can be inner loop power control gate limit value, according to this inner loop power control gate limit value, can carry out power control.
Method second instantiation that embodiment of the invention threshold value self adaptation is adjusted, the descending AMC that realizes at MS controls, information based on the packet reception condition of obtaining, realized self adaptation adjustment to the AMC threshold value, thereby make the AMC control of carrying out based on the AMC threshold value of this self adaptation adjustment can adapt to the requirement of wireless environment, improve communication quality.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to indicate relevant hardware to finish by program, described program can be stored in the computer read/write memory medium, this program may further comprise the steps when carrying out:
Obtain the information of packet reception condition;
Adjustment mode according to the information correspondence of described packet reception condition is adjusted threshold value, with adjusted threshold value as current threshold value.Wherein, described storage medium can be ROM, RAM, magnetic disc or CD or the like.
Fig. 8 is the device schematic diagram that embodiment of the invention threshold value self adaptation is adjusted, and this device comprises:
The information acquisition module is used to obtain the information of packet reception condition.
Adjusting module is used for the adjustment mode of the information correspondence of the packet reception condition obtained according to described information acquisition module, threshold value is adjusted, with adjusted threshold value as current threshold value.
The device that embodiment of the invention threshold value self adaptation is adjusted, after the information of obtaining the packet reception condition, adjustment mode according to obtaining information correspondence is adjusted threshold value, with adjusted threshold value as current threshold value, thereby information based on the packet reception condition of obtaining, realized self adaptation adjustment, thereby made the control operation of carrying out based on threshold value can adapt to the requirement of wireless environment, improved communication quality threshold value.
According to different application scenarioss, in the device that the embodiment of the invention provides, each module can corresponding different division, introduces several instantiations below respectively.
1) when the information of above-mentioned packet reception condition was ACK information or nack message, above-mentioned adjusting module can comprise:
First identifying unit, the information of the packet reception condition that is used to judge that described information acquisition module obtains is ACK information or nack message, draws result of determination.
First adjusts performance element, is used for if the result of determination that described first identifying unit draws is an ACK information threshold value being reduced default adjustment step-length; Perhaps, if the result of determination that described identifying unit draws is a nack message, and the cumulative number of reception nack message does not reach default maximum, the adjustment step-length that reduction is preset to threshold value; Perhaps, if the result of determination that draws of described identifying unit is a nack message, and the cumulative number that receives nack message reaches default maximum, and threshold value is raised default adjustment step-length.
2) information when above-mentioned packet reception condition is average repeat time, and above-mentioned information acquisition module comprises:
First performance element is used to obtain the packet number of retransmissions that increases between twice statistics, and the packet sum that sends between twice statistics.
First computing unit, the packet number of retransmissions that increases between twice statistics that is used for described performance element is obtained divided by the packet sum that sends between twice statistics, obtains the information of average repeat time as the packet reception condition.
On the said structure basis of information acquisition module, the adjusting module in the device can comprise:
Second identifying unit is used to judge whether the average repeat time that described first computing unit draws is higher than the goal-selling number of retransmissions, draws result of determination.
Second adjusts performance element, is used for if the result of determination that described second identifying unit draws is that average repeat time is higher than the goal-selling number of retransmissions, and threshold value is raised the default step-length of adjusting; The result of determination that perhaps described identifying unit draws is that average repeat time is lower than the goal-selling number of retransmissions, and threshold value is reduced the default step-length of adjusting.
3) when the information of above-mentioned packet reception condition be current mistake when wrapping number and current correct data bag and counting, the information acquisition module in the device can comprise:
Second performance element is used for the nack message number of times of statistical data packet.
Second computing unit, the nack message number of times that is used for that described second performance element is added up arrives the packet number of default maximum retransmission and wraps number as described current mistake; Described nack message number of times is not reached the packet number of default maximum retransmission as current correct data bag number.
On the architecture basics of above-mentioned information acquisition module, the default step-length Step_size that adjusts wraps number scale value PER_Target with mistake, and establishing current mistake, to wrap number be that Bad_Packet_Num, current correct data bag number are Good_Packet_Num, then during lifting step-length Step_up=Bad_Packet_Num * (Step_size-PER_Target * Step_size), the step-length during reduction is Step_down=Good_Packet_Num * PER_Target * Step_size; Above-mentioned adjusting module can comprise:
The 3rd identifying unit is used to judge current whether have data packet transmission and the current mistake bag that whether exists, and draws result of determination.
The 3rd adjusts performance element, and being used for increases by 0 if the result of determination of described the 3rd identifying unit is current free of data bag transmission to threshold value; Perhaps, if the result of determination of described the 3rd identifying unit is the current data packet transmission that has, and there is when wrapping the step-length during to the described lifting of threshold value lifting by mistake; Perhaps, if the result of determination of described the 3rd identifying unit is the current data packet transmission that has, and there is not when wrapping the step-length when threshold value is reduced described the reduction by mistake.
The device that embodiment of the invention threshold value self adaptation is adjusted, information at different pieces of information bag reception condition, module in installing has been carried out further structural design, information based on the packet reception condition of obtaining, difference according to correspondence is adjusted mode, realized self adaptation adjustment, thereby made the control operation of carrying out based on the threshold value of this self adaptation adjustment can adapt to the requirement of wireless environment, improved communication quality threshold value.
Above-mentioned 1)-3) under the different structure situation of module in the device, the threshold value of adjusting module adjustment can be used to comprise the AMC control of an above MCS grade, described threshold value comprises the threshold value corresponding to described each MCS grade.
On this basis, establish described MCS grade and comprise grade 1 to M, the threshold value of current corresponding i grade is T (i); Also comprise in this device:
The MCS mode is selected module, be used for when physics CINR measured value more than or equal to T (i), but during less than T (i+1), select the MCS mode of i grade; When physics CINR measured value during, select the MCS mode of the 1st grade smaller or equal to T (1); When physics CINR measured value during, select the MCS mode of M grade more than or equal to T (M).
Consider the situation of descending AMC control, if this device is arranged in the base station, this device also comprises:
First transceiver module is used for sending the MCS mode that downlink data packet and described MCS mode select module to select, ACK information or the nack message and the physics CINR measured value of receiving terminal feedback to terminal.
Consider the situation of up AMC control, if this device is arranged in the base station, this device also comprises:
Second transceiver module is used for the upstream data bag that receiving terminal sends, and the MCS mode of selecting module to select described MCS mode sends to terminal.
Measurement module is used to measure physics CINR measured value.
Still consider the situation of descending AMC control,, also comprise in this device if this device is arranged in terminal:
The 3rd transceiver module is used to receive the downlink data packet that the base station sends, and the MCS mode with described MCS mode selects module to select is encoded into effective CINR and sends to the base station.
The device that embodiment of the invention threshold value self adaptation is adjusted, control at upstream or downstream AMC, the module that may further include in installing is replenished, information based on the packet reception condition of obtaining, adjustment mode according to correspondence, realized self adaptation adjustment, thereby made the AMC control operation of carrying out based on the AMC threshold value of this self adaptation adjustment can adapt to the requirement of wireless environment, improved communication quality the AMC threshold value.
From foregoing description as can be seen, the device that the embodiment of the invention provides can be applied to different scenes, both can be positioned at transmitting terminal, also can be positioned at receiving terminal, and the device that Fig. 9 shows the embodiment of the invention is applied in the schematic diagram of ARQ or HARQ system.In Fig. 9, the device of embodiment of the invention threshold value self adaptation adjustment is positioned at transmitting terminal, and its working method is identical with the situation that the device of having described is positioned at transmitting terminal, repeats no more here.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the method adjusted of a threshold value self adaptation, it is characterized in that, the default step-length Step_size that adjusts wraps number scale value PER_Target with mistake, and establishing current mistake, to wrap number be that Bad_Packet_Num, current correct data bag number are Good_Packet_Num, then lifting step-length is that Step_up=Bad_Packet_Num * (Step_size-PER_Target * Step_size), the reduction step-length is Step_down=Good_Packet_Num * PER_Target * Step_size; This method comprises:
Obtain the information of packet reception condition, comprise: the Negative Acknowledgement nack message number of times of statistical data packet, the packet number that described nack message number of times is arrived default maximum retransmission is wrapped number as mistake, and described nack message number of times is not reached the packet number of default maximum retransmission as correct data bag number;
Threshold value is adjusted, being comprised: if the transmission of free of data bag increases by 0 to threshold value; Or if data packet transmission is arranged, and current existence mistake bag, to the described lifting step-length of threshold value lifting; Or if data packet transmission is arranged, and the current mistake bag that do not exist, threshold value is reduced described reduction step-length;
With adjusted threshold value as current threshold value.
2. method according to claim 1, it is characterized in that, described threshold value is used for Adaptive Modulation and Coding AMC control, and described AMC control comprises an above modulation coding mode control MCS grade, and described threshold value comprises the threshold value corresponding to described each MCS grade;
Described threshold value is adjusted into, the threshold value of described each MCS grade is adjusted.
3. method as claimed in claim 2 is characterized in that, establishes described MCS grade and comprises that grade 1 is to M, the threshold value of current corresponding i grade is T (i), described threshold value is adjusted, adjusted threshold value as after the current threshold value, is further comprised:
When physical carrier interference-to-noise ratio CINR measured value more than or equal to T (i), but during less than T (i+1), select the MCS mode of i grade; Or
When physics CINR measured value during, select the MCS mode of the 1st grade smaller or equal to T (1); Or
When physics CINR measured value during, select the MCS mode of M grade more than or equal to T (M).
4. method as claimed in claim 3, it is characterized in that, the described information of obtaining the packet reception condition further comprises before: the base station sends downlink data packet to terminal, and the base station receives ACK information or the nack message and the physics CINR measured value of self terminal feedback;
Further comprise after the described selection MCS mode: next time when terminal sends downlink data packet, the MCS mode of described selection distributed by downlink bandwidth describe DL-MAP message and send to terminal in the base station.
5. method as claimed in claim 3 is characterized in that, the described information of obtaining the packet reception condition further comprises before: terminal receives the downlink data packet that the base station sends;
Further comprise after the described selection MCS mode: terminal is encoded into effective CINR with the MCS mode of selecting and sends to the base station.
6. method as claimed in claim 3 is characterized in that, the described information of obtaining the packet reception condition further comprises before: the upstream data bag that the base station receiving terminal sends;
Base station measurement physics CINR measured value;
Further comprise after the described selection MCS mode: the base station distributes description UL-MAP message to send to terminal by upstream bandwidth the MCS mode of selecting.
7. the device adjusted of a threshold value self adaptation, it is characterized in that, the default step-length Step_size that adjusts wraps number scale value PER_Target with mistake, and establishing current mistake, to wrap number be that Bad_Packet_Num, current correct data bag number are Good_Packet_Num, then lifting step-length is that Step_up=Bad_Packet_Num * (Step_size-PER_Target * Step_size), the reduction step-length is Step_down=Good_Packet_Num * PER_Target * Step_size; This device comprises:
The information acquisition module comprises: second performance element is used for the Negative Acknowledgement nack message number of times of statistical data packet; Second computing unit, be used for that the nack message number of times that described second performance element is added up is reached the packet number of presetting maximum retransmission and wrap number, described nack message number of times is not reached the packet number of default maximum retransmission as current correct data bag number as current mistake;
Adjusting module comprises: the 3rd identifying unit, be used to judge current whether have data packet transmission and the current mistake bag that whether exists, and draw result of determination; The 3rd adjusts performance element, and being used for increases by 0 if the result of determination of described the 3rd identifying unit is current free of data bag transmission to threshold value; Perhaps the result of determination as if described the 3rd identifying unit is the current data packet transmission that has, and has the mistake bag, to the described lifting step-length of threshold value lifting; Perhaps the result of determination as if described the 3rd identifying unit is the current data packet transmission that has, and does not have the mistake bag, and threshold value is reduced described reduction step-length; With adjusted threshold value as current threshold value.
8. device as claimed in claim 7 is characterized in that, the threshold value of described adjusting module adjustment is used to comprise the AMC control of an above MCS grade, and described threshold value comprises the threshold value corresponding to described each MCS grade;
If described MCS grade comprises grade 1 to M, the threshold value of current corresponding i grade is T (i); Also comprise in this device:
The MCS mode is selected module, be used for when physics CINR measured value more than or equal to T (i), but during less than T (i+1), select the MCS mode of i grade; Perhaps, when physics CINR measured value during, select the MCS mode of the 1st grade smaller or equal to T (1); Perhaps, when physics CINR measured value during, select the MCS mode of M grade more than or equal to T (M).
9. device as claimed in claim 8 is characterized in that, also comprises in this device:
First transceiver module is used for sending the MCS mode that downlink data packet and described MCS mode select module to select, the ACK information or the nack message of receiving terminal feedback, the physics CINR measured value of receiving terminal feedback to terminal.
10. device as claimed in claim 8 is characterized in that, also comprises in this device:
Second transceiver module is used for the upstream data bag that receiving terminal sends, and the MCS mode of selecting module to select described MCS mode sends to terminal;
Measurement module is used to measure physics CINR measured value.
11. device as claimed in claim 8 is characterized in that, this device also comprises:
The 3rd transceiver module is used to receive the downlink data packet that the base station sends, and the MCS mode with described MCS mode selects module to select is encoded into effective CINR and sends to the base station.
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| CN2007101953423A CN101207461B (en) | 2007-12-10 | 2007-12-10 | Method and apparatus for self-adapting regulation of threshold value |
| PCT/CN2008/073402 WO2009074111A1 (en) | 2007-12-10 | 2008-12-09 | Adaptive threshold adjusting method and device |
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| CN2007101953423A CN101207461B (en) | 2007-12-10 | 2007-12-10 | Method and apparatus for self-adapting regulation of threshold value |
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| CN101207461B (en) * | 2007-12-10 | 2011-04-20 | 华为技术有限公司 | Method and apparatus for self-adapting regulation of threshold value |
| CN101932001B (en) * | 2009-06-24 | 2013-08-21 | 中兴通讯股份有限公司 | Adaptive modulation coding method |
| CN101635608B (en) * | 2009-09-02 | 2014-07-09 | 北京邮电大学 | Method and device for selecting MCS and wireless communication system |
| CN102201886B (en) | 2010-03-22 | 2014-03-12 | 中兴通讯股份有限公司 | Pre-coding matrix selection method and system for closed loop multiple input multiple output system |
| CN102347816B (en) | 2010-07-30 | 2014-08-13 | 中兴通讯股份有限公司 | Method and device for selecting modulation and coding scheme |
| JP5702133B2 (en) | 2010-12-22 | 2015-04-15 | 京セラ株式会社 | Communication apparatus and communication method |
| CN103457691B (en) * | 2012-06-04 | 2017-04-05 | 普天信息技术研究院有限公司 | Down self-adapting modulation coding method |
| CN103516463B (en) * | 2012-06-20 | 2017-05-31 | 南京中兴新软件有限责任公司 | A kind of method for carrying out outer shroud adaptive modulation and coding adjustment and base station |
| CN104125038B (en) * | 2013-04-25 | 2018-10-19 | 华为技术有限公司 | A kind of method and apparatus of adjustment channel quality instruction |
| US9391755B2 (en) * | 2013-05-13 | 2016-07-12 | Telefonaktiebolaget Lm Ericsson (Publ) | Radio access network node and mobile station with increased Ack/Nack space for packet downlink Ack/Nack message |
| CN104396172B (en) * | 2013-06-27 | 2018-05-29 | 华为技术有限公司 | Automatic retransmission processing method, sending ending equipment and receiving device |
| CN103546244B (en) * | 2013-11-01 | 2016-08-17 | 武汉邮电科学研究院 | A kind of adaptive modulation coding method and device |
| CN104092639B (en) * | 2014-06-13 | 2017-10-17 | 电子科技大学 | A kind of two-parameter self-adaptive modulation method of orthogonal FDM communication system |
| CN105517171B (en) * | 2014-10-15 | 2019-04-23 | 中国移动通信集团公司 | It is a kind of in LTE-A network dispatch LTE terminal method and base station |
| CN104501790B (en) * | 2014-12-17 | 2017-06-16 | 小米科技有限责任公司 | The calibration method and device of electronic compass |
| US10135562B2 (en) | 2015-05-28 | 2018-11-20 | Huawei Technologies Co., Ltd. | Apparatus and method for link adaptation in uplink grant-less random access |
| CN105472666B (en) * | 2016-01-27 | 2018-11-02 | 中国人民解放军国防科学技术大学 | A kind of method, apparatus and system that outbound link information rate is adaptive |
| CN107294661A (en) * | 2016-03-30 | 2017-10-24 | 中兴通讯股份有限公司 | Method of adjustment, device and the base station of hybrid automatic repeat-request maximum retransmission |
| CN109687937B (en) * | 2017-10-19 | 2021-08-06 | 普天信息技术有限公司 | Modulation coding mode and repetition frequency selection method and device |
| CN108494525B (en) * | 2018-03-07 | 2021-01-01 | 北京航空航天大学 | Self-adaptive selection method for combining repetition times and transmission block size in NB-IoT (NB-IoT) |
| CN110954879B (en) * | 2019-12-02 | 2022-09-20 | 北京无线电测量研究所 | Digital detection method and system for moving threshold |
| CN113595692B (en) * | 2021-07-23 | 2024-01-09 | 大连大学 | AMC-HARQ method based on dynamic threshold optimization design |
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