CN102694618A - A method for detecting loss of synchronism in an idle state and terminal device - Google Patents
A method for detecting loss of synchronism in an idle state and terminal device Download PDFInfo
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Abstract
The invention relates to communication technology and discloses a method and terminal device for detecting loss of synchronism in an idle state. The method comprises determining the reference source of loss of synchronism which includes the block error ratio of a control channel, and any one or two of the block error ratio of a data-sharing channel undertaking paging and the signal to noise ratio of a wireless channel, detecting the reference source of loss of synchronism to obtain the detection result by which the extent of the loss of synchronism is computed, ensuring the loss of synchronism when the obtained extent of the loss of synchronism computed in a set cycle exceeds a set value in an idle state. It is possible to timely and reliably detect the loss of synchronism of the terminal device in an idle state by using the method.
Description
Technical field
The present invention relates to communication technical field, more particularly, relate to step failing out detecting method and terminal equipment under a kind of idle condition.
Background technology
At present; 3GPP (3rd Generation Partnership Project; 3rd Generation Partnership Project) clearly defined the thresholding Qout that LTE (Long Term Evolution, Long Term Evolution) terminal physical layer is judged step-out under connected state in the agreement.Step-out thresholding Qout is defined as control channel PDCCH (the Physical Downlink Control Channel that supposition exists; Physical Downlink Control Channel) and PCFICH (Physical Control Format Indicator Channel, Physical Control Format Indicator Channel) Block Error Rate be 10%.Be lower than Qout if the outgoing link quality is assessed at the terminal in step-out assessment cycle (as 200 milliseconds), physical layer then reports step-out to indicate to high level.
And the control channel transmission parameter that is based on the supposition existence of confirming of above-mentioned step-out thresholding Qout is configured shown in below table 1.
Table 1:
But in real network, the transmission configuration of control channel PDCCH and PCFICH possibly have multiple different situations, can not be in full accord with the transmission parameter of above-mentioned supposition.And the LTE terminal is under connection status, and (Discontinuous Reception, under the noncontinuity reception condition, each descending sub frame (Millisecond) is all wanted monitoring control channel not disposing DRX.But; For the terminal that is under the idle condition; The time granularity of terminal downlink data receiving is very big, like the paging cycle of giving tacit consent to can be: 320 milliseconds, 64 milliseconds, 128 milliseconds, 256 milliseconds etc., if judge LTE terminal step loss condition under the idle condition according to above criterion; Because the reference source of judging; Be the descending reception data of down control channel PDCCH and PCFICH very little, it is not prompt enough reliable to cause under the idle condition step-out to be judged, thereby causes the problem that can't recover normal standby as early as possible owing to can't in time carry out the sub-district to search for again.
Summary of the invention
The embodiment of the invention provides step failing out detecting method and terminal equipment under a kind of idle condition to the problems referred to above that exist in the prior art, can in time detect the step-out of terminal equipment under the idle condition reliably.
For this reason, the embodiment of the invention provides following technical scheme:
Step failing out detecting method under a kind of idle condition comprises:
Confirm the step-out reference source, said step-out reference source comprises: in the Block Error Rate of the data sharing channel of control channel Block Error Rate and bearing call and the wireless channel Signal to Interference plus Noise Ratio any one or two;
Detect said step-out reference source, obtain testing result;
Testing result according to the step-out reference source is calculated the step-out degree;
If under idle condition, the step-out degree that in the cycle of setting, calculates surpasses predetermined value, then confirms step-out.
Preferably, the Block Error Rate of the data sharing channel of said detection bearing call obtains testing result and comprises:
Cyclic redundancy check (CRC) check results among the DSCH Downlink Shared Channel DL-SCH in the beep-page message that receives in the statistics set point number;
Calculate the Block Error Rate of the data sharing channel of bearing call according to statistics.
Preferably, said detection wireless channel Signal to Interference plus Noise Ratio obtains testing result and comprises:
Obtain the reference signal R that network side sends;
Calculate the theoretical value S of said reference signal;
Calculate wireless channel letter Signal to Interference plus Noise Ratio: SINR by following formula
DL-CHANNEL=R
2/ (R-S)
2, wherein, SINR
DL-CHANNELExpression wireless channel Signal to Interference plus Noise Ratio.
Preferably, said method also comprises:
Set the tolerance threshold value of each step-out reference source;
Said testing result computing terminal step-out degree according to the step-out reference source comprises:
Tolerance threshold value according to each step-out reference source is carried out weighted calculation to each step-out reference source, obtains the step-out degree.
Preferably, the tolerance threshold value of setting each step-out reference source comprises:
The tolerance threshold value of setting the control channel Block Error Rate is 10%;
The tolerance threshold value of the Block Error Rate of the data sharing channel of setting bearing call is 10%;
The tolerance threshold value of setting wireless channel Signal to Interference plus Noise Ratio is-75dB.
A kind of terminal equipment comprises:
Step-out reference source selected cell is used for confirming the step-out reference source, and said step-out reference source comprises: in the Block Error Rate of the data sharing channel of control channel Block Error Rate and bearing call and the wireless channel Signal to Interference plus Noise Ratio any one or two;
Detecting unit is used to detect the step-out reference source that said step-out reference source selected cell is confirmed, obtains testing result;
Computing unit, the testing result computing terminal step-out degree of the step-out reference source that is used for obtaining according to said detecting unit;
Judging unit is used under idle condition, and the step-out degree that in the cycle of setting, calculates surpasses predetermined value, confirms step-out.
Preferably, said detecting unit comprises: first detection sub-unit, and one of second detection sub-unit and the 3rd detection sub-unit or whole;
Said first detection sub-unit is used to detect the control channel Block Error Rate;
Said second detection sub-unit is used to detect the Block Error Rate of the data sharing channel of bearing call;
Said the 3rd detection sub-unit is used to detect the wireless channel Signal to Interference plus Noise Ratio.
Preferably, said second detection sub-unit comprises:
The statistics subelement is used for adding up cyclic redundancy check (CRC) check results among the beep-page message DSCH Downlink Shared Channel DL-SCH that receives in the set point number;
First computation subunit is used for calculating according to the statistics of the said first statistics subelement Block Error Rate of the data sharing channel of bearing call.
Preferably, said the 3rd detection sub-unit comprises:
Reference information obtains subelement, is used to obtain the reference signal R that network side sends;
Second computation subunit is used to calculate the theoretical value S of said reference signal, and presses following formula and calculate wireless channel Signal to Interference plus Noise Ratio: SINR
DL-CHANNEL=R
2/ (R-S)
2, wherein, SINR
DL-CHANNELThe dried ratio of making an uproar of expression wireless channel.
Preferably, said terminal equipment also comprises:
The unit is set, is used to set the tolerance threshold value of each step-out reference source;
Said computing unit specifically is used for according to the tolerance threshold value of each step-out reference source each step-out reference source being carried out weighted calculation, obtains terminal step-out degree.
Step failing out detecting method and terminal equipment under the embodiment of the invention idle condition; To the bigger characteristics of time granularity of terminal downlink data receiving under the idle condition, make prior art only judge whether step-out of terminal according to the Block Error Rate of down control channel PDCCH and PCFICH, cause the terminal idle state reliable problem not prompt enough that judges; Detect different step-out reference sources; And calculate the step-out degree according to testing result, if the terminal under idle condition, the step-out degree that in the cycle of setting, calculates surpasses predetermined value; Then confirm step-out, thereby can confirm reliably in time whether the terminal is in desynchronizing state under idle condition.
Description of drawings
Fig. 1 is the flow chart of step failing out detecting method under the embodiment of the invention idle condition;
Fig. 2 is a kind of structural representation of embodiment of the invention terminal equipment;
Fig. 3 is the another kind of structural representation of embodiment of the invention terminal equipment.
Embodiment
In order to make those skilled in the art person understand the scheme of the embodiment of the invention better, the embodiment of the invention is done further to specify below in conjunction with accompanying drawing and execution mode.
Step failing out detecting method and terminal equipment under the embodiment of the invention idle condition; The bigger characteristics of time granularity to terminal downlink data receiving under the idle condition; Make prior art only judge whether step-out of terminal, cause the terminal idle state reliable problem not prompt enough that judges, detect different step-out reference sources according to the Block Error Rate of down control channel PDCCH and PCFICH; And according to testing result calculating step-out degree; If the terminal is under idle condition, the step-out degree that in the cycle of setting, calculates surpasses predetermined value, then confirms step-out.Thereby can confirm reliably in time whether the terminal is in desynchronizing state under idle condition.
As shown in Figure 1, be the flow chart of step failing out detecting method under the embodiment of the invention idle condition, may further comprise the steps:
Said control channel comprises: PDCCH and PCFICH, and wherein, PDCCH carries scheduling and distributes and Downlink Control Information, and PCFICH is used to transmit the PDCCH format information.
In embodiments of the present invention; With the Block Error Rate of said control channel as one of step-out reference source; In addition; Also to take all factors into consideration the Block Error Rate and/or the wireless channel Signal to Interference plus Noise Ratio of the data sharing channel of bearing call, thereby only avoid in the prior art under the terminal idle state judging the whether mode reliable problem not prompt enough of step-out of terminal according to the Block Error Rate of said control channel.
The data sharing channel of said bearing call is meant PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel), is used for carrying the data from transmission channel DSCH (Downlink Shared Channel, DSCH Downlink Shared Channel).
Particularly, for the error rate of control channel, can detect by following mode:
Be mapped to DCI (the Downlink Control Indicator among the PDCCH in the statistics M subsystem message sink; Descending control indication) and be mapped to CRC (the Cyclical Redundancy Check of the CFI (Control Format Indicator) among the PCFICH; CRC) test value; The number that verification is correct is designated as N, and incorrect number then is that (M-N) is individual, and then the Block Error Rate of control channel is: BERDCI-CFI=(M-N)/M.
For the Block Error Rate of PDSCH, can detect by following mode:
The terminal utilizes the descending sub frame of network cycle property transmission paging to remove to detect PDSCH, and these time points that send the descending sub frame of paging are to know for the terminal.Therefore; During receiving, terminal X beep-page message of statistics be mapped to DL-SCH (the Downlink Shared Channel among the PDSCH; DSCH Downlink Shared Channel) crc value; The number that verification is correct is designated as Y, and incorrect number then is (X-Y), and then the Block Error Rate of the data sharing channel PDSCH of bearing call is: BERDL-SCH=(X-Y)/X.
For the wireless channel Signal to Interference plus Noise Ratio, can accomplish through detection reference signal, said reference signal is a pilot signal, is to offer a kind of known signal that the terminal is used for channel estimating or channel detection by network side.The time that reference signal is sent is relevant with cell ID with frequency location, and cell ID is known by the terminal, so the reference signal that network side sends, i.e. the actual reception value R of reference signal can be extracted in time of confirming and frequency location in the terminal.In addition; Because the reference signal data are according to cell ID, timeslot number, OFDM (Orthogonal Frequency Division Multiplexing; OFDM) parameter such as symbol sequence number generates; And these parameters all are known for the terminal, so the terminal can go out the theoretical value S of reference signal according to these calculation of parameter.Like this, the actual reception value R of reference signal is deducted its theoretical value S, can obtain noise and interference.Therefore, can obtain Signal to Interference plus Noise Ratio is: SINR
DL-CHANNEL=R
2/ (R-S)
2
Step 103 is calculated the step-out degree according to the testing result of step-out reference source.
The front is mentioned, and in embodiments of the present invention, said step-out reference source can comprise: in the Block Error Rate of the data sharing channel of control channel Block Error Rate and bearing call and the wireless channel Signal to Interference plus Noise Ratio any one or two.Therefore, in practical application, the testing result that can take all factors into consideration definite step-out reference source is confirmed whether step-out of terminal.
Comprise that with the step-out reference source above-mentioned three is that example is elaborated below.
Can set the tolerance threshold value of each step-out reference source respectively, such as:
The Block Error Rate threshold value Threshold of PDCCH/PCFICH transmission
DCI-CFI-BERBe 10%;
The Block Error Rate threshold value Threshold of PDSCH transmission
DL-SCH-BERBe 10%;
The Signal to Interference plus Noise Ratio threshold value Threshold of downlink wireless channel
DL-CHANNEL-SINRFor-75dBm.
Step-out degree Q
IDLE_outBe defined as the terminal and can receive the down wireless link data level reliably, specifically can carry out weighted calculation to each step-out reference source, obtain the step-out degree according to the tolerance threshold value of each step-out reference source.
Such as, the weight of setting above-mentioned three step-out reference sources is respectively a=0.25, b=0.25, g=0.5, and then the step-out degree is:
Q
IDLE_out＝a＊BOOL[BER
DCI-CFI＞Threshold
DCI-CFI-BER]+
b＊BOOL[BER
DL-SCH＞Threshold
DL-SCH-BER]+
g＊BOOL[SINR
DL-CHANNEL＜Threshold
DL-CHANNEL-SINR](1)
Wherein, BOOL [BER
DCI-CFI＞Threshold
DCI-CFI-BER] expression BER
DCI-CFI＞Threshold
DCI-CFI-BERBoolean, if BER
DCI-CFI＞Threshold
DCI-CFI-BER, then its Boolean is 1, otherwise its Boolean is 0;
Equally, BOOL [BER
DL-SCH＞Threshold
DL-SCH-BER] expression BER
DL-SCH＞Threshold
DL-SCH-BERBoolean, if BER
DL-SCH＞Threshold
DL-SCH-BER, then its Boolean is 1, otherwise its Boolean is 0;
Equally, BOOL [SINR
DL-CHANNEL＜Threshold
DL-CHANNEL-SINR] expression SINR
DL- CHANNEL＜Threshold
DL-CHANNEL-SINRBoolean, if SINR
DL-CHANNEL＜Threshold
DL-CHANNEL-SINR, then its Boolean is 1, otherwise its Boolean is 0.
Need to prove; Under the situation that the step-out reference source one of includes only in these two of Block Error Rate and the wireless channel Signal to Interference plus Noise Ratio of data sharing channel of control channel Block Error Rate and bearing call; The computational process of step-out degree and above-mentioned similar; And the weight of each step-out reference source also can be set as required, and this embodiment of the invention is not done qualification.
Certainly; The embodiment of the invention does not limit the concrete account form of above-mentioned step-out degree; In practical application; As long as take all factors into consideration the not testing result of synchronous/asynchronous reference source, only can avoid carrying out step-out and judge and cause the terminal idle state reliable problem not prompt enough that judges according to the control channel Block Error Rate
With above-mentioned formula (1) is example, if step-out degree QI
DLE_out=1, represent that then the testing result of three step-out reference sources has all exceeded each self-corresponding tolerance threshold value, in this case, can judge that the terminal down wireless link can not satisfy reliable reception downlink data level.
If the terminal is under idle condition, at assessment cycle T
IDLE_Q_out_EvaluateInterior Q
IDLE_outEqual 1 always, then think the terminal step-out.Said assessment cycle can be confirmed by the DRX cycle under the idle condition.
After the step-out of definite terminal, can report step-out to indicate to the terminal higher-layer protocols, so that in time carrying out the sub-district, the terminal searches for the normal standby state that returns to again.
It is thus clear that step failing out detecting method under the embodiment of the invention idle condition is to the bigger characteristics of time granularity of terminal downlink data receiving under the idle condition; Make prior art only judge whether step-out of terminal according to the Block Error Rate of down control channel PDCCH and PCFICH; Cause the terminal idle state reliable problem not prompt enough that judges, detect different step-out reference sources, and calculate the step-out degree according to testing result; If the terminal is under idle condition; The step-out degree that in the cycle of setting, calculates surpasses predetermined value, then confirms step-out, thereby can confirm reliably in time whether the terminal is in desynchronizing state under idle condition.And paging is monitored in the terminal on paging time of reception point under idle condition, monitoring statistics shared channel Block Error Rate and the dried noise ratio of measurement wireless channel letter between paging periods, can not increase extra consumption to the terminal.
Correspondingly, the embodiment of the invention also provides a kind of terminal equipment, and is as shown in Figure 2, is a kind of structural representation of this terminal equipment.
Step-out reference source selected cell 201 is used for confirming the step-out reference source, and said step-out reference source comprises: in the Block Error Rate of the data sharing channel of control channel Block Error Rate and bearing call and the wireless channel Signal to Interference plus Noise Ratio any one or two;
Detecting unit 202 is used to detect the step-out reference source that said step-out reference source selected cell 201 is confirmed, obtains testing result;
Judging unit 204 is used under idle condition, and the step-out degree that in the cycle of setting, calculates surpasses predetermined value, confirms step-out.
In embodiments of the present invention, said detecting unit comprises: first detection sub-unit, and one of second detection sub-unit and the 3rd detection sub-unit or whole, wherein:
Said first detection sub-unit is used to detect the control channel Block Error Rate;
Said second detection sub-unit is used to detect the Block Error Rate of the data sharing channel of bearing call;
Said the 3rd detection sub-unit is used to detect the wireless channel Signal to Interference plus Noise Ratio.
When concrete the application, said first detection sub-unit can be carried out the control channel Block Error Rate by following mode and detected:
Be mapped to DCI (the Downlink Control Indicator among the PDCCH in the statistics M subsystem message sink; Descending control indication) and be mapped to the CRC test value of the CFI (Control Format Indicator) among the PCFICH; The number that verification is correct is designated as N; Incorrect number then is that (M-N) is individual, and then the Block Error Rate of control channel is: BERDCI-CFI=(M-N)/M.
A kind of embodiment of said second detection sub-unit can comprise:
The statistics subelement is used for adding up CRC check result among the beep-page message DL-SCH that receives in the set point number;
First computation subunit is used for calculating according to the statistics of the said first statistics subelement Block Error Rate of the data sharing channel of bearing call.
Said second detection sub-unit can repeat no more at this with reference to the description in the step failing out detecting method under the embodiment of the invention idle condition of front to the testing process of the Block Error Rate of the data sharing channel of bearing call.
A kind of embodiment of said the 3rd detection sub-unit can comprise:
Reference information obtains subelement, is used to obtain the reference signal R that network side sends;
Second computation subunit is used to calculate the theoretical value S of said reference signal, and presses following formula and calculate wireless channel Signal to Interference plus Noise Ratio: SINR
DL-CHANNEL=R
2/ (R-S)
2, wherein, SINR
DL-CHANNELThe dried ratio of making an uproar of expression wireless channel.
Said the 3rd detection sub-unit can repeat no more at this with reference to the description in the step failing out detecting method under the embodiment of the invention idle condition of front to the testing process of wireless channel Signal to Interference plus Noise Ratio.
The terminal equipment of the embodiment of the invention; Through detecting different step-out reference sources; And calculate the step-out degree according to testing result, if the terminal under idle condition, the step-out degree that in the cycle of setting, calculates surpasses predetermined value; Then confirm step-out, thereby can confirm reliably in time whether the terminal is in desynchronizing state under idle condition.And paging is monitored in the terminal on paging time of reception point under idle condition, monitoring statistics shared channel Block Error Rate and the dried noise ratio of measurement wireless channel letter between paging periods, can not increase extra consumption to the terminal.
The front is mentioned, and in embodiments of the present invention, said step-out reference source can comprise: in the Block Error Rate of the data sharing channel of control channel Block Error Rate and bearing call and the wireless channel Signal to Interference plus Noise Ratio any one or two.Therefore, in practical application, the testing result that can take all factors into consideration definite step-out reference source is confirmed whether step-out of terminal.And, this embodiment of the invention is not done qualification according to the calculating of step-out degree multiple implementation being arranged to the testing result of step-out reference source.
As shown in Figure 3, be the another kind of structural representation of embodiment of the invention terminal equipment.
Different with Fig. 2 is that in this embodiment, said terminal equipment also comprises:
Unit 301 is set, is used to set the tolerance threshold value of each step-out reference source.
Correspondingly, said computing unit 203 can carry out weighted calculation to each step-out reference source according to the tolerance threshold value of each step-out reference source, obtains terminal step-out degree.Detailed process can repeat no more at this with reference to the description in the step failing out detecting method under the embodiment of the invention idle condition of front.
Identical similar part is mutually referring to getting final product between each embodiment in this specification, and each embodiment stresses all is the difference with other embodiment.Especially, for apparatus embodiments, because it is basically similar in appearance to method embodiment, so describe fairly simplely, relevant part gets final product referring to the part explanation of method embodiment.Apparatus embodiments described above only is schematic; Wherein said unit as the separating component explanation can or can not be physically to separate also; And, can select wherein some or all of unit realize the purpose of present embodiment scheme according to the needs of reality.Those of ordinary skills promptly can understand and implement under the situation of not paying creative work.
More than disclosedly be merely preferred implementation of the present invention; But the present invention is not limited thereto; Any those skilled in the art can think do not have a creationary variation, and, all should drop in protection scope of the present invention not breaking away from some improvement and the retouching of being done under the principle of the invention prerequisite.
Claims (10)
1. step failing out detecting method under the idle condition is characterized in that, comprising:
Confirm the step-out reference source, said step-out reference source comprises: in the Block Error Rate of the data sharing channel of control channel Block Error Rate and bearing call and the wireless channel Signal to Interference plus Noise Ratio any one or two;
Detect said step-out reference source, obtain testing result;
Testing result according to the step-out reference source is calculated the step-out degree;
If under idle condition, the step-out degree that in the cycle of setting, calculates surpasses predetermined value, then confirms step-out.
2. the method for claim 1 is characterized in that, the Block Error Rate of the data sharing channel of said detection bearing call obtains testing result and comprises:
Cyclic redundancy check (CRC) check results among the DSCH Downlink Shared Channel DL-SCH in the beep-page message that receives in the statistics set point number;
Calculate the Block Error Rate of the data sharing channel of bearing call according to statistics.
3. the method for claim 1 is characterized in that, said detection wireless channel Signal to Interference plus Noise Ratio obtains testing result and comprises:
Obtain the reference signal R that network side sends;
Calculate the theoretical value S of said reference signal;
Calculate wireless channel letter Signal to Interference plus Noise Ratio: SINR by following formula
DL-CHANNEL=R
2/ (R-S)
2, wherein, SINR
DL-CHANNELExpression wireless channel Signal to Interference plus Noise Ratio.
4. the method for claim 1 is characterized in that, said method also comprises:
Set the tolerance threshold value of each step-out reference source;
Said testing result computing terminal step-out degree according to the step-out reference source comprises:
Tolerance threshold value according to each step-out reference source is carried out weighted calculation to each step-out reference source, obtains the step-out degree.
5. method as claimed in claim 4 is characterized in that, the tolerance threshold value of setting each step-out reference source comprises:
The tolerance threshold value of setting the control channel Block Error Rate is 10%;
The tolerance threshold value of the Block Error Rate of the data sharing channel of setting bearing call is 10%;
The tolerance threshold value of setting wireless channel Signal to Interference plus Noise Ratio is-75dB.
6. a terminal equipment is characterized in that, comprising:
Step-out reference source selected cell is used for confirming the step-out reference source, and said step-out reference source comprises: in the Block Error Rate of the data sharing channel of control channel Block Error Rate and bearing call and the wireless channel Signal to Interference plus Noise Ratio any one or two;
Detecting unit is used to detect the step-out reference source that said step-out reference source selected cell is confirmed, obtains testing result;
Computing unit, the testing result computing terminal step-out degree of the step-out reference source that is used for obtaining according to said detecting unit;
Judging unit is used under idle condition, and the step-out degree that in the cycle of setting, calculates surpasses predetermined value, confirms step-out.
7. terminal equipment as claimed in claim 6 is characterized in that, said detecting unit comprises: first detection sub-unit, and one of second detection sub-unit and the 3rd detection sub-unit or whole;
Said first detection sub-unit is used to detect the control channel Block Error Rate;
Said second detection sub-unit is used to detect the Block Error Rate of the data sharing channel of bearing call;
Said the 3rd detection sub-unit is used to detect the wireless channel Signal to Interference plus Noise Ratio.
8. terminal equipment as claimed in claim 7 is characterized in that, said second detection sub-unit comprises:
The statistics subelement is used for adding up cyclic redundancy check (CRC) check results among the beep-page message DSCH Downlink Shared Channel DL-SCH that receives in the set point number;
First computation subunit is used for calculating according to the statistics of the said first statistics subelement Block Error Rate of the data sharing channel of bearing call.
9. terminal equipment as claimed in claim 7 is characterized in that, said the 3rd detection sub-unit comprises:
Reference information obtains subelement, is used to obtain the reference signal R that network side sends;
Second computation subunit is used to calculate the theoretical value S of said reference signal, and presses following formula and calculate wireless channel Signal to Interference plus Noise Ratio: SINR
DL-CHANNEL=R
2/ (R-S)
2, wherein, SINR
DL-CHANNELThe dried ratio of making an uproar of expression wireless channel.
10. terminal equipment as claimed in claim 6 is characterized in that, said terminal equipment also comprises:
The unit is set, is used to set the tolerance threshold value of each step-out reference source;
Said computing unit specifically is used for according to the tolerance threshold value of each step-out reference source each step-out reference source being carried out weighted calculation, obtains terminal step-out degree.
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