CN1335695A - Outer loop power control method for WCDMA system - Google Patents
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Abstract
The outer loop power control method for WCDMA system is that in the base station controller, SNR threshold for closed loop power control of base station is regulated adaptively based on the measured CRC result of data frame and given FER index. In the base station, closed loop power control is performed according to SNR threshold and measured SNR, to produce power control command to user terminal for regulating its emitted power. Through outer loop power control and regulating SNR threshold according to practical link quality, the present invention can maintain the requirement of link FER in case of great change in radio propagation environment.
Description
(Wideband Code Division Multiple Access, WCDMA) system particularly relate to the method that the power in the WCDMA system is controlled to the present invention relates to Wideband Code Division Multiple Access (WCDMA).
CDMA is a kind of modulation and multiple access interconnection technique based on broadband communication.In the CDMA communication system, because base station and travelling carriage use same cdma wireless frequency band, the base station all is to disturb the signal emission of each travelling carriage to other travelling carriage of this sub-district and neighbor cell travelling carriage, and the base station receives the interference that also all is subjected to other travelling carriage of this sub-district and neighbor cell travelling carriage to the signal of each travelling carriage.In order to reduce to disturb, maximized system capacity should satisfy under the condition of channel performance, minimizes the transmitting power of base station and travelling carriage.Therefore, it is necessary in the CMDA system power being controlled.
In U.S. Patent No. 5812938, provide the method for a kind of closed power control in the cdma system: signal to noise ratio (the Signal to Noise Ratio of the signal that periodic measurement travelling carriage emission in base station comes, SNR), then with this measured value and given signal-noise ratio threshold comparison, produce power control command according to result relatively, and power control commands is sent to travelling carriage.Travelling carriage approaches signal-noise ratio threshold according to the transmitting power of power control commands adjustment oneself so that reach the noise specific energy of base station.According to the different quality index request of data with different rate, the data of every kind of speed are provided with different minimum required signal-to-noise ratio thresholdings, in case determined the speed of data, so minimum required signal-to-noise ratio thresholding is also just down fixing.Often the quality index of using be the error rate (Bit ErrorRate, BER) and (Frame Error Rate, FER).In fact the mobile wireless transmission environment is in continuous variation, and the speed of travelling carriage is also in continuous variation, and the lowest signal-to-noise thresholding that satisfies the link-quality requirement will inevitably constantly change within the specific limits.Owing to can not determine the respective function relation between signal-noise ratio threshold and the signal-to-noise ratio measurements, and the error of snr measurement also can affect to the control precision of inner-loop power control, therefore, the closed power control based on fixing signal-noise ratio threshold is difficult to guarantee the link-quality requirement.
The object of the present invention is to provide the method in a kind of broadband CDMA system about exterior ring power control.This method adopts in base station controller, Frame cyclic redundancy check (CRC) (the CyclicRedundancy Check that arrives according to base station measurement, CRC) result and given frame error rate index, adjust the used signal-noise ratio threshold of closed-loop power control in the base station adaptively, to guarantee the requirement of link frame error rate index.
Described method of the present invention is to realize by following scheme:
1. determine the adjustment step-length and the downward modulation cycle of mistake frame thresholding, mistake frame tolerance thresholding, signal-noise ratio threshold according to target frame error rate;
2. according to Frame cyclic redundancy check (CRC) outcome record mistake frame condition, further comprise:
1) mistake frame tolerance timer and downward modulation timer are set;
2) the frame cyclic redundancy check (CRC) of fetching data starts the downward modulation timer as a result the time, and record mistake frame starts mistake frame tolerance timer simultaneously when detecting the mistake frame, and ignores all the other mistake frames between the starting period at mistake frame tolerance timer;
3) arrive mistake frame thresholding at the mistake frame recording, or reduce the timer timing and then trigger step 3, remove the mistake frame recording simultaneously, replacement downward modulation timer forwards the 2nd again to) go on foot;
3. adjust signal-noise ratio threshold according to the mistake frame condition:
1) adjusts signal-noise ratio threshold according to incident that triggers this step and mistake frame recording situation;
2) the bound correction signal-noise ratio threshold of adjusting according to signal-noise ratio threshold.Describe the present invention in detail with reference to one embodiment of the present of invention and accompanying drawing thereof below
Fig. 1 is the system diagram that adopts the outer-loop power controlling method of WCDMA wireless communication system of the present invention.
Fig. 2 adopts in the outer-loop power controlling method of WCDMA wireless communication system of the present invention to produce the signal-noise ratio threshold flow chart.
Fig. 3 is the flow chart that adopts record mistake frame condition in the outer-loop power controlling method of WCDMA wireless communication system of the present invention.
Fig. 4 adopts the flow chart of adjusting signal-noise ratio threshold in the outer-loop power controlling method of WCDMA wireless communication system of the present invention according to the mistake frame condition.
Fig. 5 be the signal-noise ratio threshold of base station controller 100 record of the preferred embodiment of the present invention and U.S. Patent No. 5812938 fixedly signal-noise ratio threshold be the contrast figure of 0dB.
Fig. 6 is that the base station 110 of the preferred embodiment of the present invention records up link (signal by user terminal pass to the base station) frame error rate and the contrast figure of the up link frame error rate that records according to the device of U.S. Patent No. 5812938.
Fig. 1 has shown the system diagram of the outer-loop power controlling method of the WCDMA wireless communication system that adopts the solution of the present invention.
The described method equipment needed thereby that carries out exterior ring power control in the WCDMA system comprises a user terminal, a base station and a base station controller at least.User terminal receives the power control command that sends from the base station, and adjusts transmitting power according to power control commands; The signal to noise ratio of the data that the base station measurement user terminal sends is also carried out the verification of Frame cyclic redundancy check (CRC) to it, the result delivers to base station controller with the Frame cyclic redundancy check (CRC), determines power control command and sends to user terminal according to the signal-noise ratio threshold value that the measured value and the base station controller of signal to noise ratio are sent here; Base station controller produces signal-noise ratio threshold and delivers to the base station according to the Frame cyclic redundancy check (CRC) result of predefined target frame error rate and base station measurement.
The WCDMA wireless communication system of this Fig. 1 comprises a base station controller 100, a base station 110 and a user terminal 120.In the scheme of this figure, base station controller 100 is connected with base station 110, and user terminal 120 also is connected with base station 110, and user terminal 120 moves in the different districts scope of system with variable velocity.
Part about power control in the user terminal 120 comprises power control commands processor 121 and transmitting power adjusting device 123.The power control commands 116 that power control command processor 121 receives from base station 110.The value of power control commands 116 can get 1,0 or-1.Power control commands processor 121 correspondingly is provided with power according to the value of power control commands 116 and adjusts step-length 122 and be Δ
TPC, 0 ,-Δ
TPCThe value that transmitting power adjusting device 123 is adjusted step-length 122 according to power is adjusted transmitting power.
Part about power control in the base station 110 comprises Frame cyclic redundancy check (CRC) verification unit 111, snr measurement unit 113 and power control commands generator 115.The signal to noise ratio 114 of the data flow of sending from user terminal 120 124 is measured in snr measurement unit 113, and it is delivered to power control commands generator 115.The signal-noise ratio threshold 102 that signal to noise ratio 114 that power control commands generator 115 comparison snr measurement unit 113 are sent here and base station controller 100 are sent here produces power control commands 116 according to following principle then:
If signal to noise ratio 114 is greater than signal-noise ratio threshold 102, then the value of power control commands 116 is-1;
If signal to noise ratio 114 is less than signal-noise ratio threshold 102, then the value of power control commands 116 is 1;
If signal to noise ratio 114 equals signal-noise ratio threshold 102, then the value of power control commands 116 is 0.
The method of the inner loop power control described in the U.S. Patent No. 5812938 and above-mentioned roughly the same.Difference be signal-noise ratio threshold 102 be not to provide in real time by base station controller 100, but the data in advance of every kind of speed is configured respectively.
Use the fixedly existing explanation of defective preamble of signal-noise ratio threshold, below the corrective measure of main description the present invention on U.S. Patent No. 5812938.
In base station 110, the present invention has increased Frame cyclic redundancy check (CRC) verification unit 111, be used for the data flow of sending from user's terminal 120 124 is carried out the verification of Frame cyclic redundancy check (CRC), and Frame cyclic redundancy check (CRC) result 112 is delivered to base station controller 100.The Frame cyclic redundancy check (CRC) is that whether consistent the verification used always receive data and transmission data method, usually be that unit carries out the verification of Frame cyclic redundancy check (CRC) with the frame, if receive data and send data consistent, judge that then this frame has been a frame, and Frame cyclic redundancy check (CRC) result is changed to 0; Otherwise judge that this frame is the mistake frame, the result is changed to 1 with the Frame cyclic redundancy check (CRC).
The part of base station controller 100 relevant power controls is signal-noise ratio threshold generation units 102.The Frame cyclic redundancy check (CRC) that signal-noise ratio threshold generation unit 102 is sent here according to base station 110 is output signal 112, predefined target frame error rate 103 and the predefined signal-noise ratio threshold adjusting range signal-noise ratio threshold upper limit 104 and signal-noise ratio threshold lower limit 105 as a result, produce signal-noise ratio threshold 101 according to method shown in Figure 2, then it is delivered to the power control commands generator 115 of base station 110.
The value of target frame error rate 103 is by the decision of the quality requirement of concrete business, and to require be 0.01 to the frame error rate of voice service usually, and it is 10 that the frame error rate of data service requires
-5In the transmission course of business, according to the load condition of system, target frame error rate 103 can dynamically be adjusted, and promptly suitably increases target frame error rate 103 when system loading is heavier, suitably reduces target frame error rate 103 when system loading is light.
The signal-noise ratio threshold upper limit 104 and signal-noise ratio threshold lower limit 105 are determined according to the actual wireless communication environments and the concrete type of service of specific cell.In the transmission course of business, according to the load condition and the service distribution situation of system, the signal-noise ratio threshold upper limit 104 and signal-noise ratio threshold lower limit 105 also can dynamically be adjusted.
Fig. 2 has shown the flow chart that produces signal-noise ratio threshold in the outer-loop power controlling method that adopts WCDMA wireless communication system of the present invention.
This flow process starts from step 200, and target signal to noise ratio generation unit 102 is finished some initialized work:
At first, determine downward modulation cycle and mistake frame thresholding.It is principle that the determining of downward modulation cycle and mistake frame thresholding should make the percentage of the shared totalframes of mistake frame be no more than target frame error rate 103 with the result a downward modulation cycle inner control.Secondly, signal-noise ratio threshold is set and adjusts step-length.Adjust the desirable 0～1dB of step-length, according to actual conditions, pacing length up and down can be got the also desirable different value of same value, but should guarantee in the whole control process, and the probability of mediation downward modulation and amplitude are about equally on the signal-noise ratio threshold.
At last, be set the mistake frame tolerance cycle.When channel worsens suddenly, might produce one section continuous mistake frame, thereby cause the very fast rising of signal-noise ratio threshold, and may rise to unnecessary high value.For fear of this situation, filter continuous mistake frame, the mistake frame tolerance cycle is set, all ignore at the mistake frame of mistake frame in the tolerance cycle.According to actual conditions, desirable 0～downward modulation of mistake frame tolerance cycle cycle ÷ 2 is made as downward modulation cycle * 10% in a preferred embodiment of the invention.
In step 300, the Frame cyclic redundancy check (CRC) result 112 that target signal to noise ratio generation unit 102 is sent here according to base station 110 carries out record according to the described method of Fig. 3 to the mistake frame.
At last, in step 400, target signal to noise ratio generation unit 102 is adjusted signal-noise ratio threshold according to the mistake frame report that step 300 obtains according to the described method of Fig. 4.
Fig. 3 has shown the flow chart of the mistake frame recording method that step 300 adopted among Fig. 2.
This flow process starts from step 310, and target signal to noise ratio generation unit 102 at first is provided with mistake frame tolerance timer and downward modulation timer, promptly will miss frame number, downward modulation counting and mistake frame tolerance counting clear 0 in step 311.
Start the downward modulation timer as a result the time in the step 320 frame cyclic redundancy check (CRC) of fetching data then, record mistake frame starts mistake frame tolerance timer simultaneously when detecting the mistake frame, and ignores all the other mistake frames between the starting period at mistake frame tolerance timer.Specifically implement according to the following steps: in the step 321 frame cyclic redundancy check (CRC) result that fetches data, and judgment data frame cyclic redundancy check (CRC) result is 0 still to be 1.If Frame cyclic redundancy check (CRC) result is 1, then go to step 322, judge whether mistake frame tolerance counting is 0.If mistake frame tolerance counting is 0, then go to step 323, will miss frame number and add 1, arrive step 324 again, will miss the frame tolerance and count and add 1, then the step 331 in the step 330; If mistake frame tolerance counting is not 0 in step 322, then go to step 326.If Frame cyclic redundancy check (CRC) result is not 1 in step 321, then go to step 325, judge that whether mistake frame tolerance counting is greater than 0.If mistake frame tolerance counting is not more than 0, then go to the step 332 in the step step 330; Otherwise go to step 326, will miss frame tolerance counting and add 1, arrive step 327 again, judge that whether mistake frame tolerance counting is more than or equal to the mistake frame tolerance cycle.If not, then go to step 331 in the step step 330; If, then go to step 328, it is clear 0 to miss frame tolerance counting, again the step 331 in the step 330.
In step 330, when the mistake frame recording to mistake frame thresholding, or the timing of downward modulation timer then triggers step 3, removes the mistake frame recording simultaneously, the downward modulation timer of resetting forwards step 320 again to.Specifically implement according to the following steps: in step 331, target signal to noise ratio generation unit 102 judges whether the mistake frame number reaches mistake frame thresholding, if reached mistake frame thresholding, then goes to step 334, and the step 400 that starts simultaneously among Fig. 2 is adjusted signal-noise ratio threshold; If do not reach mistake frame thresholding, then go to step 332, will reduce counting and add 1, judge to step 333 whether the downward modulation counting reaches the downward modulation cycle again.If the downward modulation counting does not reach the downward modulation cycle, then transfer back to the step 321 in the step 320, take off a Frame cyclic redundancy check (CRC) result; If the downward modulation counting has reached the downward modulation cycle, then go to step 334, the step 400 that starts simultaneously among Fig. 2 is adjusted signal-noise ratio threshold.In step 334, it is clear 0 that target signal to noise ratio generation unit 102 will miss frame number, and arriving step 335 again, will to reduce counting clear 0, transfers back to the step 321 in the step 320 at last, takes off a Frame cyclic redundancy check (CRC) result.
Fig. 4 has shown the flow chart of the method for the adjustment signal-noise ratio threshold that step 400 adopted among Fig. 2.
Target signal to noise ratio generation unit 102 is at first adjusted signal-noise ratio threshold according to incident that triggers this step and mistake frame recording situation in step 410.Specifically implement according to the following steps: step 441 inspection starts the event type of this flow process, if event type is mistake frame number 〉=mistake frame thresholding, then goes to step 442, establishes interim signal-noise ratio threshold=signal-noise ratio threshold+rise step-length, arrives step 420 again.If event type is the downward modulation counting 〉=downward modulation cycle, then go to step 413, whether judge to miss frame number is 0, if 0, it is long then to establish the pacing once of interim signal-noise ratio threshold=signal-noise ratio threshold to step 414, arrives step 420 again; If be not 0, then establish interim signal-noise ratio threshold=signal-noise ratio threshold to step 415, arrive step 420 again.
In step 420, the bound correction signal-noise ratio threshold that target signal to noise ratio generation unit 102 is adjusted according to signal-noise ratio threshold.Specifically implement according to the following steps: whether judge interim signal-noise ratio threshold value greater than the signal-noise ratio threshold upper limit 104 in step 421, if then make the signal-noise ratio threshold 101=signal-noise ratio threshold upper limit 104 to step 422; Otherwise whether judge interim signal-noise ratio threshold value less than signal-noise ratio threshold lower limit 105 to step 423,, otherwise make the interim signal-noise ratio threshold of signal-noise ratio threshold 101=to step 424 if then make signal-noise ratio threshold 101=signal-noise ratio threshold lower limit 105 to step 4425.At last, target signal to noise ratio generation unit 102 is delivered to base station 110 with adjusted signal-noise ratio threshold 101.
Fig. 5 is to be 0.01 at the frame error rate thresholding, the translational speed of user terminal midway (being that user terminal is when having transmitted 20000 frame data) by 120 under the extreme case of (kilometer/hour) become 30 (kilometer/hour), the signal-noise ratio threshold of base station controller 100 records of the preferred embodiment of the present invention and U.S. Patent No. 5812938 fixedly signal-noise ratio threshold are the contrast figure of 0dB.Wherein signal-noise ratio threshold of the present invention is used in 501 expressions, and the signal-noise ratio threshold of United States Patent (USP) is used in 502 expressions.
Fig. 6 is to be 0.01 at the frame error rate thresholding, the translational speed of user terminal is midway by 120 under the extreme case of (kilometer/hour) become 30 (kilometer/hour), under the effect of signal-noise ratio threshold value shown in Figure 4, the contrast figure of the up link that the base station 110 of the preferred embodiment of the present invention records (being signal is passed to the base station by user terminal) frame error rate and the up link frame error rate that records according to the device of U.S. Patent No. 5812938.Wherein the frame error rate that the present invention records is used in 601 expressions, and the frame error rate that U.S. Patent No. 5812938 records is used in 602 expressions.
Complex chart 5 and Fig. 6, because great changes will take place for the speed of user terminal, also great changes will take place to cause satisfying the signal-noise ratio threshold value of channel performance requirement, in U.S. Patent No. 5812938 in default of the mechanism of adjusting signal-noise ratio threshold, under the effect of constant signal-noise ratio threshold 502 shown in Figure 4, can't guarantee link-quality.Make the frame error rate 602 that its up link records among Fig. 5 when subscriber teminal speed changes, sharply raise; And the present invention is because adopted external circule power control, can adjust signal-noise ratio threshold, signal-noise ratio threshold 501 is elevated to when subscriber teminal speed changes adaptively guarantees the required level of link-quality, thereby its up link frame error rate 601 that records can roughly remain on the desired level.
The present invention adopts in base station controller, according to Frame Frame cyclic redundancy check (CRC) result and the given frame error rate index that base station measurement arrives, adjusts the used signal-noise ratio threshold of closed-loop power control in the base station adaptively.In the base station, closed-loop power control then according to signal-noise ratio threshold and the actual snr value that measures, produces power control command, delivers to user terminal, in order to adjust the transmitting power of user terminal.The present invention adjusts signal-noise ratio threshold according to the link quality condition of reality in real time owing to adopted external circule power control method, so when great changes will take place, still can guarantee the requirement of link frame error rate index at wireless propagation environment.
Claims (9)
1, a kind of method of exterior ring power control in the WCDMA system is characterized in that may further comprise the steps:
The first step: adjustment step-length and the downward modulation cycle step (200) of determining mistake frame thresholding, mistake frame tolerance thresholding, signal-noise ratio threshold according to target frame error rate (frame error rate);
Second step: according to Frame Cyclic Redundancy Check outcome record mistake frame condition step (300);
The 3rd step: adjust signal-noise ratio threshold step (400) according to the mistake frame condition.
2, according to the method for the described exterior ring power control in the WCDMA system of claim 1, it is characterized in that: described step (200) further comprises:
At first, determine downward modulation cycle and mistake frame thresholding;
Secondly, signal-noise ratio threshold is set and adjusts step-length;
At last, be set the mistake frame tolerance cycle.
3, according to the method for the described exterior ring power control in the WCDMA system of claim 1, it is characterized in that:
Described step (300) further comprises:
At first: mistake frame tolerance timer and downward modulation timer step (310) are set;
Secondly: the frame Cyclic Redundancy Check that fetches data starts the downward modulation timer as a result the time, and record mistake frame starts mistake frame tolerance timer simultaneously when detecting the mistake frame, and ignores all the other mistake frame steps (320) between the starting period at mistake frame tolerance timer;
At last: to mistake frame thresholding, or the timing of downward modulation timer then triggers according to the mistake frame condition and adjusts signal-noise ratio threshold, removes the mistake frame recording simultaneously, forwards Frame Cyclic Redundancy Check outcome record mistake frame step (330) again at the mistake frame recording.
4, according to the method for the described exterior ring power control in the WCDMA system of claim 1, it is characterized in that:
Described step (400) further comprises:
At first: adjust signal-noise ratio threshold step (410) according to incident that triggers this step and mistake frame recording situation:
Secondly: according to the bound correction signal-noise ratio threshold step (420) of signal-noise ratio threshold adjustment.
5, according to the method for the described exterior ring power control in the WCDMA system of claim 3, it is characterized in that:
Described step (310) is finished target SNR generation unit (102) mistake frame tolerance timer and downward modulation timer is set, and promptly step (311) will be missed frame number, downward modulation counting and mistake frame tolerance counting clear 0.
6, according to the described method that exterior ring power is controlled in the WCDMA system of claim 3, it is characterized in that: levy and be: described step (320) is finished successively: the frame Cyclic Redundancy Check that fetches data starts the downward modulation timer as a result the time, record mistake frame starts mistake frame tolerance timer simultaneously when detecting the mistake frame, and ignore all the other mistake frames between the starting period:, and judge that this result is 0 still is 1 in step (321) the frame Cyclic Redundancy Check result that fetches data at mistake frame tolerance timer;
If in step (321) Frame Cyclic Redundancy Check result is 1, then go to step (322), judge whether mistake frame tolerance counting is 0;
If mistake frame tolerance counting is 0, then go to step (323), will miss frame number and add 1, arrive step (324) again, will miss frame tolerance counting and add 1, the step (331) that arrives then in the step (330) judges that whether the mistake frame number is more than or equal to mistake frame thresholding;
If mistake frame tolerance counting is not 0 in step (322), then goes to step (326) and miss frame and tolerate to count and add 1;
If CRC result is not 1 in step (321), then go to step (325), judge that whether mistake frame tolerance counting is greater than 0;
If mistake frame tolerance counting is not more than 0, the step (332) that then goes in the step step (330) realizes that the downward modulation counting adds 1;
Otherwise go to step (326), will miss frame tolerance counting and add 1, arrive step (327) again, judge that whether mistake frame tolerance counting is more than or equal to the mistake frame tolerance cycle; If not, then go to step (331) in the step step (330); If, then go to step (328), it is clear 0 to miss frame tolerance counting, arrives the step (331) in the step (330) again.
7. according to the method for the described exterior ring power control in the WCDMA system of claim 3, it is characterized in that:
Described step (330) finish successively when the mistake frame recording to mistake frame thresholding, or the timing of downward modulation timer then triggers according to the mistake frame condition and adjusts signal-noise ratio threshold, removes the mistake frame recording simultaneously, forwards Frame again to
Cyclic Redundancy Check outcome record mistake frame:
In step (331), target SNR generation unit (102) judges whether the mistake frame number reaches mistake frame thresholding,
If reached mistake frame thresholding, then go to step (334) and carry out, setting up procedure (400) is adjusted the signal to noise ratio (snr) thresholding simultaneously;
If do not reach mistake frame thresholding, then go to step (332), will reduce counting and add 1, judge to step (333) whether the downward modulation counting reaches the downward modulation cycle again;
If the downward modulation counting does not reach the downward modulation cycle, then transfer back to the step (321) in the step (320), take off a Frame Cyclic Redundancy Check result;
If the downward modulation counting has reached the downward modulation cycle, then go to step (334), setting up procedure (400) is adjusted the signal to noise ratio (snr) thresholding simultaneously; In step (334), it is clear 0 that target SNR generation unit (102) will miss frame number, and arriving step (335) again, will to reduce counting clear 0, transfers back to the step (321) in the step (320) at last, takes off a Frame Cyclic Redundancy Check result.
8, according to the method for the described exterior ring power control in the WCDMA system of claim 4, it is characterized in that:
Described step (410) is finished; Adjust signal-noise ratio threshold according to incident that triggers this step and mistake frame recording situation:
Step (411) inspection starts the event type of this flow process:
If event type is mistake frame number 〉=mistake frame thresholding, then go to step (412), establish interim SNR thresholding=SNR thresholding+rise step-length, arrive step (420) again;
If event type is the downward modulation counting 〉=downward modulation cycle, then go to step (413), judge whether the mistake frame number is 0, if 0, then establish interim signal to noise ratio (snr) thresholding=signal to noise ratio (snr) thresholding-downward modulation step-length to step (414), arrive step 420 again; If be not 0, then establish interim SNR thresholding=SNR thresholding to step 415, arrive step 420 again.
9, according to the method for the described exterior ring power control in the WCDMA system of claim 4, it is characterized in that:
Described step (420) is finished target SNR generation unit (102) according in the signal-noise ratio threshold adjustment
Lower limit correction signal-noise ratio threshold;
Step (421) judges that whether interim SNR threshold value is greater than the SNR thresholding upper limit 104;
If then make the SNR thresholding 101=SNR thresholding upper limit 104 to step 422;
Otherwise whether judge interim SNR threshold value less than SNR thresholding lower limit 105 to step 423,
If then make SNR thresholding 101=SNR thresholding lower limit 105, otherwise make the interim SNR thresholding of SNR thresholding 101=to step 424 to step 4425;
At last, target SNR generation unit 102 is delivered to base station 110 with adjusted SNR thresholding 101.
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