CN103840864A - Method and device for updating TDS outer ring power control signal to noise ratio - Google Patents
Method and device for updating TDS outer ring power control signal to noise ratio Download PDFInfo
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- CN103840864A CN103840864A CN201410065522.XA CN201410065522A CN103840864A CN 103840864 A CN103840864 A CN 103840864A CN 201410065522 A CN201410065522 A CN 201410065522A CN 103840864 A CN103840864 A CN 103840864A
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Abstract
The invention provides a method and device for updating the TDS outer ring power control signal to noise ratio. The method includes the steps of obtaining a Present_BLER, a Present_SNR_Target, a Present_UpStep and a Present_DownStep; judging whether the Present_BLER is larger than a preset BLER_Target; determining the UpStep_Target of an SNR_Target according to the Present_SNR_Target and the Present_UpStep if the Present_BLER is larger than the preset BLER_Target; determining the DownStep_Target of the SNR_Target according to the Present_SNR_Target and the Present_DownStep if the Present_BLER is not larger than the preset BLER_Target; updating the SNR_Target according to the Present_SNR_Target, the UpStep_Target and / or the DownStep_Target. According to the method and device, the SNR_Target can work in a linearity region and is prevented from being too large or small for a long time, an outer ring power control mechanism and an inner ring power control mechanism can be better matched, and wireless link quality fluctuation is reduced.
Description
Technical field
The present invention relates to mobile communication technology field, particularly relate to a kind of method that TDS external circule power control signal to noise ratio is upgraded, and, the device that a kind of TDS external circule power control signal to noise ratio is upgraded.
Background technology
At TDS (Time Division-Synchronous Code Division Multiple Access, TD SDMA access) in, RNC (Radio Network Controller, radio network controller) according to the BLER(Block Error Ratio of transmission channel, bLock error rate) statistics is to target signal to noise ratio value SNR Target(Signal Noise Ratio, signal to noise ratio) do the adjustment that increases/reduce, if adjusting step-length fixes, be easy to cause occurring the phenomenon of SNR Target toning, make SNR_Target long-term work in higher region.
Closed-loop power control is in TDS, to carry out a kind of important mode of power control system, and closed-loop power control can be subdivided into external circule power control and inner-loop power control.In existing external circule power control process, it is a fixing value that signal to noise ratio is adjusted step-length (comprise and raise step-length and lower step-length), this design no doubt has and realizes easy advantage, but in real transmission environment, BLER and SNR_Target are not simple linear relationships, but change along with the variation of environment, therefore may there is following problem: excessive if step-length is selected, may cause power control amplitude to exceed needed amplitude, such as upper timing, cross highland and improve certain user's ascending power, make its BLER far beyond needed desired value, will produce interference to other users, lower timing, can make again user's power can not meet normal communication needs, if it is too small that step-length is selected, may cause the adjustment of power not catch up with the variation of environment, particularly, in the time that transmission environment sharply changes, can cause the adjustment repeatedly of power, increase the power control frequency of RNC, reduce again the frequency stability of TDS simultaneously.
Therefore, one of problem that those skilled in the art are in the urgent need to address is, a kind of method that TDS external circule power control signal to noise ratio is upgraded is proposed, and, the device that TDS external circule power control signal to noise ratio is upgraded, in order to allow SNR_Target can be operated in the range of linearity, avoids long-time excessive or too small, make the better of external circule power control and the cooperation of inner-loop power control mechanism, reduce the fluctuation of radio link quality.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method that TDS external circule power control signal to noise ratio is upgraded, in order to allow SNR_Target can be operated in the range of linearity, avoid long-time excessive or too small, make the better of external circule power control and the cooperation of inner-loop power control mechanism, reduce the fluctuation of radio link quality.
Accordingly, the present invention also provides the device that a kind of TDS external circule power control signal to noise ratio is upgraded.
In order to address the above problem, the invention discloses a kind of method that TDS external circule power control signal to noise ratio is upgraded, comprising:
Obtain current block error rate Present_BLER, current goal signal to noise ratio Present_SNR_Target, current rise step-length Present_UpStep, and, current downward step-length Present_DownStep;
Judge whether described Present_BLER is greater than preset object block error rate BLER_Target;
If so, determine that according to described Present_SNR_Target and Present_UpStep the target of target signal to noise ratio SNR_Target raises step-length UpStep_Target;
If not, determine the target downward step-length DownStep_Target of target signal to noise ratio SNR_Target according to described Present_SNR_Target and Present_DownStep;
According to described Present_SNR_Target, and UpStep_Target and/or DownStep_Target upgrade described SNR_Target.
Preferably, describedly determine that according to Present_SNR_Target and Present_UpStep the step that the target of target signal to noise ratio SNR_Target raises step-length UpStep_Target comprises:
Judge whether described Present_SNR_Target is less than preset lower threshold Low_Bound, and/or, be greater than preset upper limit threshold value Up_Bound;
If described Present_SNR_Target is less than Low_Bound, calculate the first preset up adjustment coefficient COEF_U_1 and Present_UpStep long-pending, obtain first object and raise step-length UpStep_Target1;
If described Present_SNR_Target is greater than Up_Bound, calculate the first preset up adjustment coefficient COEF_U_2 and Present_UpStep long-pending, obtain the second target and raise step-length UpStep_Target2;
If described Present_SNR_Target is greater than Low_Bound, and be less than Up_Bound, obtaining described Present_UpStep is that the 3rd target raises step-length UpStep_Target3.
Preferably, describedly determine that according to Present_SNR_Target and Present_DownStep the target of target signal to noise ratio SNR_Target lowers the step of step-length DownStep_Target and comprise:
Judge whether described Present_SNR_Target is less than preset lower threshold Low_Bound;
If described Present_SNR_Target is less than Low_Bound, calculate the first preset descending adjustment coefficient COEF_D_1 and Present_DownStep long-pending, obtain first object and lower step-length DownStep_Target1;
If described Present_SNR_Target is greater than Up_Bound, calculate the first preset descending adjustment coefficient COEF_D_2 and Present_DownStep long-pending, obtain the second target and lower step-length DownStep_Target2;
If described Present_SNR_Target is greater than Low_Bound, and be less than Up_Bound, obtaining described Present_DownStep is that the 3rd target is lowered step-length DownStep_Target3.
Preferably, described according to Present_SNR_Target, and the step that UpStep_Target and/or DownStep_Target upgrade described SNR_Target comprises:
Calculate described Present_SNR_Target and UpStep_Target1 sum and obtain the first rise renewal value;
Described SNR_Target is updated to described first and raises renewal value;
And/or,
Calculate described Present_SNR_Target and UpStep_Target2 sum and obtain the second rise renewal value;
Described SNR_Target is updated to described second and raises renewal value;
And/or,
Calculate described Present_SNR_Target and UpStep_Target3 sum and obtain the 3rd rise renewal value;
Described SNR_Target is updated to the described the 3rd and raises renewal value.
Preferably, described according to Present_SNR_Target, and the step that UpStep_Target and/or DownStep_Target upgrade described SNR_Target comprises:
The difference of calculating described Present_SNR_Target and DownStep_Target1 obtains first and lowers renewal value;
Described SNR_Target is updated to described first and lowers renewal value;
And/or,
The difference of calculating described Present_SNR_Target and DownStep_Target2 obtains second and raises renewal value;
Described SNR_Target is updated to described second and lowers renewal value;
And/or,
The difference of calculating described Present_SNR_Target and DownStep_Target3 obtains the 3rd and lowers renewal value;
Described SNR_Target is updated to the described the 3rd and lowers renewal value.
Preferably, described COEF_U_1 is 1.2, and described COEF_U_2 is 0.3, and described COEF_D_1 is 0.5, and described COEF_D_2 is 1.5, and described Low_Bound is 4db, and described Up_Bound is 7.5db.
The embodiment of the invention also discloses the device that a kind of TDS external circule power control signal to noise ratio is upgraded, comprising:
Acquisition module, for obtaining current block error rate Present_BLER, current goal signal to noise ratio Present_SNR_Target, current rise step-length Present_UpStep, and, current downward step-length Present_DownStep;
Judge module, for judging whether described Present_BLER is greater than preset object block error rate BLER_Target; If so, call rise module, if not, call downward module;
Raise module, raise step-length UpStep_Target for the target of determining target signal to noise ratio SNR_Target according to described Present_SNR_Target and Present_UpStep;
Lower module, lower step-length DownStep_Target for the target of determining target signal to noise ratio SNR_Target according to described Present_SNR_Target and Present_DownStep;
Update module, for the described Present_SNR_Target of foundation, and UpStep_Target and/or DownStep_Target upgrade described SNR_Target.
Preferably, described rise module comprises:
Raise threshold decision submodule, for judging whether described Present_SNR_Target is less than preset lower threshold Low_Bound, and/or, be greater than preset upper limit threshold value Up_Bound; If described Present_SNR_Target is less than Low_Bound, call, if described Present_SNR_Target is greater than Up_Bound, call, if described Present_SNR_Target is greater than Low_Bound, and be less than Up_Bound, call;
First raises step-length obtains submodule, long-pending for calculating the first preset up adjustment coefficient COEF_U_1 and Present_UpStep, obtains first object and raises step-length UpStep_Target1;
Second raises step-length obtains submodule, long-pending for calculating the first preset up adjustment coefficient COEF_U_2 and Present_UpStep, obtains the second target and raises step-length UpStep_Target2;
The 3rd raises step-length obtains submodule, is that the 3rd target raises step-length UpStep_Target3 for obtaining described Present_UpStep.
Preferably, described downward module comprises:
Lower threshold decision submodule, for judging whether described Present_SNR_Target is less than preset lower threshold Low_Bound; If described Present_SNR_Target is less than Low_Bound; call the first downward step-length and obtain submodule; if described Present_SNR_Target is greater than Up_Bound; call the second downward step-length and obtain submodule; if described Present_SNR_Target is greater than Low_Bound; and be less than Up_Bound, call the 3rd downward step-length and obtain submodule;
First lowers step-length obtains submodule, long-pending for calculating the first preset descending adjustment coefficient COEF_D_1 and Present_DownStep, obtains first object and lowers step-length DownStep_Target1;
Second lowers step-length obtains submodule, long-pending for calculating the first preset descending adjustment coefficient COEF_D_2 and Present_DownStep, obtains the second target and lowers step-length DownStep_Target2;
The 3rd lowers step-length obtains submodule, is that the 3rd target is lowered step-length DownStep_Target3 for obtaining described Present_DownStep.
Preferably, described update module comprises:
First raises renewal value calculating sub module, obtains the first rise renewal value for calculating described Present_SNR_Target and UpStep_Target1 sum;
First raises renewal value upgrades submodule, raises renewal value for described SNR_Target being updated to described first;
And/or,
Second raises renewal value calculating sub module, obtains the second rise renewal value for calculating described Present_SNR_Target and UpStep_Target2 sum;
Second raises renewal value upgrades submodule, raises renewal value for described SNR_Target being updated to described second;
And/or,
The 3rd raises renewal value calculating sub module, obtains the 3rd rise renewal value for calculating described Present_SNR_Target and UpStep_Target3 sum;
The 3rd raises renewal value upgrades submodule, raises renewal value for described SNR_Target being updated to the described the 3rd.
Preferably, described update module comprises:
First lowers renewal value calculating sub module, obtains the first downward renewal value for calculating the difference of described Present_SNR_Target and DownStep_Target1;
First lowers renewal value upgrades submodule, lowers renewal value for described SNR_Target being updated to described first;
And/or,
Second lowers renewal value calculating sub module, obtains the second rise renewal value for calculating the difference of described Present_SNR_Target and DownStep_Target2;
Second lowers renewal value upgrades submodule, lowers renewal value for described SNR_Target being updated to described second;
And/or,
The 3rd lowers renewal value calculating sub module, obtains the 3rd downward renewal value for calculating the difference of described Present_SNR_Target and DownStep_Target3;
The 3rd lowers renewal value upgrades submodule, lowers renewal value for described SNR_Target being updated to the described the 3rd.
Compared with prior art, the present invention includes following advantage:
In embodiments of the present invention, adjust in step-length and divide by region according to the linear relationship of BLER and SNR at external circule power control.In BLER and the linear region of SNR, adjust step-length and fix.And become the region of non-linear relation with SNR at BLER, adjust step-length fixing.Wherein, for the lower region of current SNR _ Target, lower step-length less, rise step-length is larger, and assurance SNR_Target more multiplex (MUX) does in the range of linearity; For the higher region of current SNR _ Target, lower step-length larger, rise step-length is less, and assurance SNR_Target more multiplex (MUX) does in the range of linearity.
The embodiment of the present invention compares Present_BLER and BLER_Target in external circule power control process, and according to comparative result, determine the adjustment step-length of Present_SNR_Target, utilize the adjustment step-length of definite Present_SNR_Target dynamically to adjust SNR_Target.Because the embodiment of the present invention can the different step-length of corresponding employing be adjusted mode according to actual situation in the relationship area of different BLER and SNR, dynamically adjust SNR_Target with this, allow SNR_Target can be operated in the range of linearity, adapt to the larger situation of change of network environment, avoid long-time excessive or too small, make the better of external circule power control and the cooperation of inner-loop power control mechanism, effectively reduce the number of times of power saltus step, make within power adjusts to needed scope quickly, to reduce the fluctuation of radio link quality.
Accompanying drawing explanation
Fig. 1 is the flow chart of steps of the embodiment of the method for a kind of TDS external circule power control signal to noise ratio renewal of the present invention;
Fig. 2 is the schematic diagram that is related to of the logarithm value of BLER in a kind of speech business of the present invention and SNR;
Fig. 3 is the structured flowchart of the device embodiment of a kind of TDS external circule power control signal to noise ratio renewal of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
In current scheme, RNC is for the magnitude relationship of only considering current BLER and object block error rate BLER Target in the SNR Target adjustment process in external circule power control, and concrete method of adjustment is as follows:
Work as Present_BLER>BLER_Target, SNR_Target=Present_SNR_Target+UpStep;
Work as Present_BLER<BLER_Target, SNR_Target=Present_SNR_Target-DownStep;
In current scheme, raise step-length UpStep and lower step-length DownStep and fix, no matter current target signal to noise ratio Present_SNR_Target is how many, adjustment step-length is constant.
When SNR Target itself larger (for example exceed 10db), now causing the reason that current block error rate Present_BLER is high is not that SNR_Target is too small, but due to the requirement of disturbing or the result of other reasons inner-loop power control adjustment does not reach SNR_Target.Now raise again SNR Target very little for the gain of BLER, raise very unreasonable if also continue according to fixed step size (0.8db).Otherwise, in the very little region of SNR_Target, in the time that Present BLER is still less than BLER_Target, still reduce SNR_Target according to original step-length, result causes SNR_Target to be reduced to very little value, causes link for random fluctuation poor anti jamming capability.
At present scheme can cause following problem: first aspect is at Present_SNR_Target during in very large region, and lifting SNR_Target is few for the gain of BLER; Second aspect can cause the long-time high power transmission of terminal, also can cause strong jamming to other communities simultaneously; The third aspect is still large step-length rise in the situation that Present_SNR_Target is so high, after the radio link quality between UE and base station is improved, because SNR_Target is too high, cause the SNR long-term work of wireless link in upper zone, there is the toning of SNR_Target.Fourth aspect is the region very little at Present_SNR_Target, and still large step is lowered SNR_Target, can cause SNR_Target too low, and link interference free performance declines.
In order to address the above problem, inventor herein creatively proposes one of core idea of the embodiment of the present invention and is, adjusts step-length constant in BLER and the linear region of SNR, can adjust SNR_Target based on fixed step size.Outside BLER and the linear region of SNR, for the less region of current SNR _ Target, raise step-length and suitably increase, lower step-length and suitably diminish; For the larger region of current SNR _ Target, raise step-length and suitably diminish, lower step-length and suitably increase.Dynamically adjust SNR Target according to Present_BLER, allow SNRTarget more be operated in the range of linearity, improve link interference free performance.
Embodiment mono-:
With reference to Fig. 1, show the flow chart of steps of the embodiment of the method for a kind of TDS external circule power control of the present invention signal to noise ratio renewal, specifically can comprise the steps:
Step 101, obtains current block error rate Present_BLER, current goal signal to noise ratio Present_SNR_Target, and current rise step-length Present_UpStep, and, current downward step-length Present_DownStep;
In specific implementation, SNR(Signal to Noise Ratio, signal to noise ratio), being called again signal to noise ratio, signal to noise ratio numerical value is higher, and noise is less, and equipment antijamming capability is high.
The target of carrying out power control is that the quality of service that guarantees wireless link meets the requirements, and quality of service can characterize with BLER.Under different transmission environments, BLER is different from the corresponding relation of SNR, therefore needs exterior ring power control to adjust in real time SNR_Target according to Present_BLER, to guarantee normal communication quality requirement.Exterior ring power control is exactly for inner-loop power control provides dynamic SNR_Target.
In embodiments of the present invention, can be according to the preset suitable BLER_Target of the actual conditions of TDS, the embodiment of the present invention is without this is not restricted.
In a preferred embodiment of the present invention, described step 103 specifically can comprise following sub-step:
Sub-step S11, judges whether described Present_SNR_Target is less than preset lower threshold Low_Bound, and/or, be greater than preset upper limit threshold value Up_Bound; If described Present_SNR_Target is less than Low_Bound, carry out sub-step S12, if described Present_SNR_Target is greater than Up_Bound, carry out sub-step S13, if described Present_SNR_Target is greater than Low_Bound, and be less than Up_Bound, carry out sub-step S14;
Sub-step S12, calculates the first preset up adjustment coefficient COEF_U_1 and Present_UpStep long-pending, obtains first object and raises step-length UpStep_Target1;
Sub-step S13, calculates the first preset up adjustment coefficient COEF_U_2 and Present_UpStep long-pending, obtains the second target and raises step-length UpStep_Target2;
Sub-step S14, obtaining described Present_UpStep is that the 3rd target raises step-length UpStep_Target3.
It should be noted that, the division in the region of BLER and SNR relation, for the region that is less than Low_Bound at Present_SNR_Target, and, be greater than Up_Bound at Present_SNR_Target, think that BLER becomes the region of non-linear relation with SNR, be less than Up_Bound at Present_SNR_Target, be greater than the region of Low_Bound, think the region that BLER and SNR are linear.Wherein, described Low_Bound can be 4db, and described Up_Bound can be 7.5db, certainly, in actual applications, can divide according to actual conditions are corresponding, even adopts the dividing mode of multistage, and the embodiment of the present invention is not restricted this.
In a kind of example of the concrete application of the present invention, if Present_BLER is greater than BLER_Target, and outside BLER and the linear region of SNR, because the environment of transmission channel is now comparatively unstable, according to the corresponding adjustment step-length of size of Present_SNR_Target.Particularly, if Present_SNR_Target is less than Low_Bound, raises step-length and suitably increase; If Present_SNR_Target is greater than Up_Bound, raise step-length and suitably diminish, adjust SNR_Target with this.
If Present_BLER is greater than BLER_Target, and in BLER and the linear region of SNR, adjust SNR_Target according to fixed step size.Particularly, if Present_SNR_Target is less than Up_Bound, be greater than Low_Bound, because the environment of transmission channel is now comparatively stable, can adjust SNR_Target according to fixed step size.
In a preferred embodiment of the present invention, described step 104 specifically can comprise following sub-step:
Sub-step S21, judges whether described Present_SNR_Target is less than preset lower threshold Low_Bound; If described Present_SNR_Target is less than Low_Bound, carry out sub-step S22, if described Present_SNR_Target is greater than Up_Bound, carry out sub-step S23, if described Present_SNR_Target is greater than Low_Bound, and be less than Up_Bound, carry out sub-step S24;
Sub-step S22, calculates the first preset descending adjustment coefficient COEF_D_1 and Present_DownStep long-pending, obtains first object and lowers step-length DownStep_Target1;
Sub-step S23, calculates the first preset descending adjustment coefficient COEF_D_2 and Present_DownStep long-pending, obtains the second target and lowers step-length DownStep_Target2;
Sub-step S24, obtaining described Present_DownStep is that the 3rd target is lowered step-length DownStep_Target3.
In the another kind of example of the concrete application of the present invention, if Present_BLER is less than BLER_Target, and outside BLER and the linear region of SNR, because the environment of transmission channel is now comparatively unstable, according to the corresponding adjustment step-length of size of Present_SNR_Target.Particularly, if Present_SNR_Target is less than Low_Bound, lowers step-length and suitably diminish; If Present_SNR_Target is greater than Up_Bound, lower step-length and suitably increase, adjust SNR_Target with this.
If Present_BLER is less than BLER_Target, and in BLER and the linear region of SNR, adjust SNR_Target according to fixed step size.Particularly, if Present_SNR_Target is less than Up_Bound, be greater than Low_Bound, because the environment of transmission channel is now comparatively stable, can adjust SNR_Target according to fixed step size.
In actual applications, in the time that needs are adjusted step sizes, directly adopt coefficient to raising step-length and lowering step-length and adjust, particularly, described COEF_U_1 can be 1.2, and described can COEF_U_2 be 0.3, and described COEF_D_1 can be 0.5, described COEF_D_2 can be 1.5, certainly, the adjustment coefficient of step-length can also adopt other value, or, adopt corresponding function according to transmission environment, the embodiment of the present invention is not restricted this.
In a preferred embodiment of the present invention, described step 105 specifically can comprise following sub-step:
Sub-step S31, calculates described Present_SNR_Target and UpStep_Target1 sum and obtains the first rise renewal value;
Sub-step S32, is updated to described first by described SNR_Target and raises renewal value;
And/or,
Sub-step S41, calculates described Present_SNR_Target and UpStep_Target2 sum and obtains the second rise renewal value;
Sub-step S42, is updated to described second by described SNR_Target and raises renewal value;
And/or,
Sub-step S51, calculates described Present_SNR_Target and UpStep_Target3 sum and obtains the 3rd rise renewal value;
Sub-step S52, is updated to the described the 3rd by described SNR_Target and raises renewal value.
In application example of the present invention, can be according to the comparative result of Present_BLER and BLER_Target, and the corresponding relation of BLER and SNR is determined the size of UpStep_Target, calculate UpStep_Target and Present_SNR_Target sum and upgrade SNR_Target.
In a preferred embodiment of the present invention, described step 105 specifically can comprise following sub-step:
Sub-step S61, the difference of calculating described Present_SNR_Target and DownStep_Target1 obtains first and lowers renewal value;
Sub-step S62, is updated to described first by described SNR_Target and lowers renewal value;
And/or,
Sub-step S71, the difference of calculating described Present_SNR_Target and DownStep_Target2 obtains second and raises renewal value;
Sub-step S72, is updated to described second by described SNR_Target and lowers renewal value;
And/or,
Sub-step S81, the difference of calculating described Present_SNR_Target and DownStep_Target3 obtains the 3rd and lowers renewal value;
Sub-step S82, is updated to the described the 3rd by described SNR_Target and lowers renewal value.
Equally, in application example of the present invention, can be according to the comparative result of Present_BLER and BLER_Target, and, the corresponding relation of BLER and SNR is determined the size of DownStep_Target, and calculates DownStep_Target and Present_SNR_Target sum renewal SNR_Target.
In embodiments of the present invention, adjust in step-length and divide by region according to the linear relationship of BLER and SNR at external circule power control.In BLER and the linear region of SNR, adjust step-length and fix.And become the region of non-linear relation with SNR at BLER, adjust step-length fixing.Wherein, for the lower region of current SNR _ Target, lower step-length less, rise step-length is larger, and assurance SNR_Target more multiplex (MUX) does in the range of linearity; For the higher region of current SNR _ Target, lower step-length larger, rise step-length is less, and assurance SNR_Target more multiplex (MUX) does in the range of linearity.
In order to make those skilled in the art further understand the embodiment of the present invention, below adopt concrete example to describe.
With reference to the schematic diagram that is related to of the logarithm value of BLER in the of the present invention a kind of speech business shown in Fig. 2 and SNR, take AMR12.2K speech business as example, from then on can find out, in SNR is 4～7.5db regional extent, the logarithm value of BLER and SNR are linear relationship substantially, along with SNR is from 4db to 7.5db, BLER drops to 0.1% from 30% left and right.For this situation, lower limit that can the range of linearity is set to 4db, and the upper limit is set to 7.5db, particularly:
Work as Present_BLER>BLER_Target,
If?Present_SNR_Target<Low_Bound
SNR_Target=Present_SNR_Target+UpStep*COEF_U_1；
If?Present_SNR_Target>Up_Bound
SNR_Target=Present_SNR_Target+UpStep*COEF_U_2；
Else
SNR_Target=Present_SNR_Target+UpStep；
Wherein: COEF_U_1=1.2, COEF_U_2=0.3.
Work as Present_BLER<BLER_Target,
If?Present_SNR_Target<Low_Bound
SNR_Target=Present_SNR_Target-DownStep*COEF_D_1；
If?Present_SNR_Target>Up_Bound
SNR_Target=Present_SNR_Target-DownStep*COEF_D_2；
Else
SNR_Target=Present_SNR_Target-DownStep；
Wherein: COEF_D_1=0.5, COEF_D_2=1.5.
In embodiments of the present invention, in external circule power control process, compare Present_BLER and BLER_Target, and according to comparative result, determine the adjustment step-length of Present_SNR_Target, utilize the adjustment step-length of definite Present_SNR_Target dynamically to adjust SNR_Target.Because the embodiment of the present invention can the different step-length of corresponding employing be adjusted mode according to actual situation in the relationship area of different BLER and SNR, dynamically adjust SNR_Target with this, allow SNR_Target can be operated in the range of linearity, adapt to the larger situation of change of network environment, avoid long-time excessive or too small, make the better of external circule power control and the cooperation of inner-loop power control mechanism, effectively reduce the number of times of power saltus step, make within power adjusts to needed scope quickly, to reduce the fluctuation of radio link quality.
It should be noted that, for embodiment of the method, for simple description, therefore it is all expressed as to a series of combination of actions, but those skilled in the art should know, the application is not subject to the restriction of described sequence of movement, because according to the application, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in specification all belongs to preferred embodiment, and related action might not be that the application is necessary.
Embodiment bis-:
With reference to Fig. 3, show the structured flowchart of the device embodiment of a kind of TDS external circule power control signal to noise ratio renewal of the present invention, specifically can comprise as lower module:
Acquisition module 301, for obtaining current block error rate Present_BLER, current goal signal to noise ratio Present_SNR_Target, current rise step-length Present_UpStep, and, current downward step-length Present_DownStep;
Judge module 302, for judging whether described Present_BLER is greater than preset object block error rate BLER_Target; If so, call rise module, if not, call downward module;
Raise module 303, raise step-length UpStep_Target for the target of determining target signal to noise ratio SNR_Target according to described Present_SNR_Target and Present_UpStep;
Lower module 304, lower step-length DownStep_Target for the target of determining target signal to noise ratio SNR_Target according to described Present_SNR_Target and Present_DownStep;
In a preferred embodiment of the present invention, described rise module 303 can comprise following submodule:
Raise threshold decision submodule, for judging whether described Present_SNR_Target is less than preset lower threshold Low_Bound, and/or, be greater than preset upper limit threshold value Up_Bound; If described Present_SNR_Target is less than Low_Bound, call, if described Present_SNR_Target is greater than Up_Bound, call, if described Present_SNR_Target is greater than Low_Bound, and be less than Up_Bound, call;
First raises step-length obtains submodule, long-pending for calculating the first preset up adjustment coefficient COEF_U_1 and Present_UpStep, obtains first object and raises step-length UpStep_Target1;
Second raises step-length obtains submodule, long-pending for calculating the first preset up adjustment coefficient COEF_U_2 and Present_UpStep, obtains the second target and raises step-length UpStep_Target2;
The 3rd raises step-length obtains submodule, is that the 3rd target raises step-length UpStep_Target3 for obtaining described Present_UpStep.
In a preferred embodiment of the present invention, described downward module 304 can comprise following submodule:
Lower threshold decision submodule, for judging whether described Present_SNR_Target is less than preset lower threshold Low_Bound; If described Present_SNR_Target is less than Low_Bound; call the first downward step-length and obtain submodule; if described Present_SNR_Target is greater than Up_Bound; call the second downward step-length and obtain submodule; if described Present_SNR_Target is greater than Low_Bound; and be less than Up_Bound, call the 3rd downward step-length and obtain submodule;
First lowers step-length obtains submodule, long-pending for calculating the first preset descending adjustment coefficient COEF_D_1 and Present_DownStep, obtains first object and lowers step-length DownStep_Target1;
Second lowers step-length obtains submodule, long-pending for calculating the first preset descending adjustment coefficient COEF_D_2 and Present_DownStep, obtains the second target and lowers step-length DownStep_Target2;
The 3rd lowers step-length obtains submodule, is that the 3rd target is lowered step-length DownStep_Target3 for obtaining described Present_DownStep.
Update module 305, for the described Present_SNR_Target of foundation, and UpStep_Target and/or DownStep_Target upgrade described SNR_Target.
In a preferred embodiment of the present invention, described update module 305 can comprise following submodule:
First raises renewal value calculating sub module, obtains the first rise renewal value for calculating described Present_SNR_Target and UpStep_Target1 sum;
First raises renewal value upgrades submodule, raises renewal value for described SNR_Target being updated to described first;
And/or,
Second raises renewal value calculating sub module, obtains the second rise renewal value for calculating described Present_SNR_Target and UpStep_Target2 sum;
Second raises renewal value upgrades submodule, raises renewal value for described SNR_Target being updated to described second;
And/or,
The 3rd raises renewal value calculating sub module, obtains the 3rd rise renewal value for calculating described Present_SNR_Target and UpStep_Target3 sum;
The 3rd raises renewal value upgrades submodule, raises renewal value for described SNR_Target being updated to the described the 3rd.
In a preferred embodiment of the present invention, described update module 305 can comprise following submodule:
First lowers renewal value calculating sub module, obtains the first downward renewal value for calculating the difference of described Present_SNR_Target and DownStep_Target1;
First lowers renewal value upgrades submodule, lowers renewal value for described SNR_Target being updated to described first;
And/or,
Second lowers renewal value calculating sub module, obtains the second rise renewal value for calculating the difference of described Present_SNR_Target and DownStep_Target2;
Second lowers renewal value upgrades submodule, lowers renewal value for described SNR_Target being updated to described second;
And/or,
The 3rd lowers renewal value calculating sub module, obtains the 3rd downward renewal value for calculating the difference of described Present_SNR_Target and DownStep_Target3;
The 3rd lowers renewal value upgrades submodule, lowers renewal value for described SNR_Target being updated to the described the 3rd.
For device embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part is referring to the part explanation of embodiment of the method.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.
Those skilled in the art should understand, the application's embodiment can be provided as method, device or computer program.Therefore, the application can adopt complete hardware implementation example, completely implement software example or the form in conjunction with the embodiment of software and hardware aspect.And the application can adopt the form at one or more upper computer programs of implementing of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code.
The application is with reference to describing according to flow chart and/or the block diagram of the method for the embodiment of the present application, equipment (system) and computer program.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, the instruction that makes to carry out by the processor of computer or other programmable data processing device produces the device for realizing the function of specifying at flow process of flow chart or multiple flow process and/or square frame of block diagram or multiple square frame.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, the instruction that makes to be stored in this computer-readable memory produces the manufacture that comprises command device, and this command device is realized the function of specifying in flow process of flow chart or multiple flow process and/or square frame of block diagram or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make to carry out sequence of operations step to produce computer implemented processing on computer or other programmable devices, thereby the instruction of carrying out is provided for realizing the step of the function of specifying in flow process of flow chart or multiple flow process and/or square frame of block diagram or multiple square frame on computer or other programmable devices.
Although described the application's preferred embodiment, once those skilled in the art obtain the basic creative concept of cicada, can make other change and modification to these embodiment.So claims are intended to be interpreted as comprising preferred embodiment and fall into all changes and the modification of the application's scope.
Finally, also it should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
The method of above a kind of TDS external circule power control signal to noise ratio provided by the present invention being upgraded, and, the device that a kind of TDS external circule power control signal to noise ratio is upgraded, be described in detail, applied specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention meanwhile.
Claims (11)
1. the method that TDS external circule power control signal to noise ratio is upgraded, is characterized in that, comprising:
Obtain current block error rate Present_BLER, current goal signal to noise ratio Present_SNR_Target, current rise step-length Present_UpStep, and, current downward step-length Present_DownStep;
Judge whether described Present_BLER is greater than preset object block error rate BLER_Target;
If so, determine that according to described Present_SNR_Target and Present_UpStep the target of target signal to noise ratio SNR_Target raises step-length UpStep_Target;
If not, determine the target downward step-length DownStep_Target of target signal to noise ratio SNR_Target according to described Present_SNR_Target and Present_DownStep;
According to described Present_SNR_Target, and UpStep_Target and/or DownStep_Target upgrade described SNR_Target.
2. method according to claim 1, is characterized in that, describedly determines that according to Present_SNR_Target and Present_UpStep the step that the target of target signal to noise ratio SNR_Target raises step-length UpStep_Target comprises:
Judge whether described Present_SNR_Target is less than preset lower threshold Low_Bound, and/or, be greater than preset upper limit threshold value Up_Bound;
If described Present_SNR_Target is less than Low_Bound, calculate the first preset up adjustment coefficient COEF_U_1 and Present_UpStep long-pending, obtain first object and raise step-length UpStep_Target1;
If described Present_SNR_Target is greater than Up_Bound, calculate the first preset up adjustment coefficient COEF_U_2 and Present_UpStep long-pending, obtain the second target and raise step-length UpStep_Target2;
If described Present_SNR_Target is greater than Low_Bound, and be less than Up_Bound, obtaining described Present_UpStep is that the 3rd target raises step-length UpStep_Target3.
3. method according to claim 1, is characterized in that, describedly determines that according to Present_SNR_Target and Present_DownStep the target of target signal to noise ratio SNR_Target lowers the step of step-length DownStep_Target and comprise:
Judge whether described Present_SNR_Target is less than preset lower threshold Low_Bound;
If described Present_SNR_Target is less than Low_Bound, calculate the first preset descending adjustment coefficient COEF_D_1 and Present_DownStep long-pending, obtain first object and lower step-length DownStep_Target1;
If described Present_SNR_Target is greater than Up_Bound, calculate the first preset descending adjustment coefficient COEF_D_2 and Present_DownStep long-pending, obtain the second target and lower step-length DownStep_Target2;
If described Present_SNR_Target is greater than Low_Bound, and be less than Up_Bound, obtaining described Present_DownStep is that the 3rd target is lowered step-length DownStep_Target3.
4. method according to claim 2, is characterized in that, described according to Present_SNR_Target, and the step that UpStep_Target and/or DownStep_Target upgrade described SNR_Target comprises:
Calculate described Present_SNR_Target and UpStep_Target1 sum and obtain the first rise renewal value;
Described SNR_Target is updated to described first and raises renewal value;
And/or,
Calculate described Present_SNR_Target and UpStep_Target2 sum and obtain the second rise renewal value;
Described SNR_Target is updated to described second and raises renewal value;
And/or,
Calculate described Present_SNR_Target and UpStep_Target3 sum and obtain the 3rd rise renewal value;
Described SNR_Target is updated to the described the 3rd and raises renewal value.
5. according to the method described in claim 3 or 4, it is characterized in that, described according to Present_SNR_Target, and the step that UpStep_Target and/or DownStep_Target upgrade described SNR_Target comprises:
The difference of calculating described Present_SNR_Target and DownStep_Target1 obtains first and lowers renewal value;
Described SNR_Target is updated to described first and lowers renewal value;
And/or,
The difference of calculating described Present_SNR_Target and DownStep_Target2 obtains second and raises renewal value;
Described SNR_Target is updated to described second and lowers renewal value;
And/or,
The difference of calculating described Present_SNR_Target and DownStep_Target3 obtains the 3rd and lowers renewal value;
Described SNR_Target is updated to the described the 3rd and lowers renewal value.
6. according to the method described in claim 1 or 2 or 3, it is characterized in that, described COEF_U_1 is 1.2, and described COEF_U_2 is 0.3, and described COEF_D_1 is 0.5, and described COEF_D_2 is 1.5, and described Low_Bound is 4db, and described Up_Bound is 7.5db.
7. the device that TDS external circule power control signal to noise ratio is upgraded, is characterized in that, comprising:
Acquisition module, for obtaining current block error rate Present_BLER, current goal signal to noise ratio Present_SNR_Target, current rise step-length Present_UpStep, and, current downward step-length Present_DownStep;
Judge module, for judging whether described Present_BLER is greater than preset object block error rate BLER_Target; If so, call rise module, if not, call downward module;
Raise module, raise step-length UpStep_Target for the target of determining target signal to noise ratio SNR_Target according to described Present_SNR_Target and Present_UpStep;
Lower module, lower step-length DownStep_Target for the target of determining target signal to noise ratio SNR_Target according to described Present_SNR_Target and Present_DownStep;
Update module, for the described Present_SNR_Target of foundation, and UpStep_Target and/or DownStep_Target upgrade described SNR_Target.
8. device according to claim 7, is characterized in that, described rise module comprises:
Raise threshold decision submodule, for judging whether described Present_SNR_Target is less than preset lower threshold Low_Bound, and/or, be greater than preset upper limit threshold value Up_Bound; If described Present_SNR_Target is less than Low_Bound, call, if described Present_SNR_Target is greater than Up_Bound, call, if described Present_SNR_Target is greater than Low_Bound, and be less than Up_Bound, call;
First raises step-length obtains submodule, long-pending for calculating the first preset up adjustment coefficient COEF_U_1 and Present_UpStep, obtains first object and raises step-length UpStep_Target1;
Second raises step-length obtains submodule, long-pending for calculating the first preset up adjustment coefficient COEF_U_2 and Present_UpStep, obtains the second target and raises step-length UpStep_Target2;
The 3rd raises step-length obtains submodule, is that the 3rd target raises step-length UpStep_Target3 for obtaining described Present_UpStep.
9. device according to claim 7, is characterized in that, described downward module comprises:
Lower threshold decision submodule, for judging whether described Present_SNR_Target is less than preset lower threshold Low_Bound; If described Present_SNR_Target is less than Low_Bound; call the first downward step-length and obtain submodule; if described Present_SNR_Target is greater than Up_Bound; call the second downward step-length and obtain submodule; if described Present_SNR_Target is greater than Low_Bound; and be less than Up_Bound, call the 3rd downward step-length and obtain submodule;
First lowers step-length obtains submodule, long-pending for calculating the first preset descending adjustment coefficient COEF_D_1 and Present_DownStep, obtains first object and lowers step-length DownStep_Target1;
Second lowers step-length obtains submodule, long-pending for calculating the first preset descending adjustment coefficient COEF_D_2 and Present_DownStep, obtains the second target and lowers step-length DownStep_Target2;
The 3rd lowers step-length obtains submodule, is that the 3rd target is lowered step-length DownStep_Target3 for obtaining described Present_DownStep.
10. device according to claim 8, is characterized in that, described update module comprises:
First raises renewal value calculating sub module, obtains the first rise renewal value for calculating described Present_SNR_Target and UpStep_Target1 sum;
First raises renewal value upgrades submodule, raises renewal value for described SNR_Target being updated to described first;
And/or,
Second raises renewal value calculating sub module, obtains the second rise renewal value for calculating described Present_SNR_Target and UpStep_Target2 sum;
Second raises renewal value upgrades submodule, raises renewal value for described SNR_Target being updated to described second;
And/or,
The 3rd raises renewal value calculating sub module, obtains the 3rd rise renewal value for calculating described Present_SNR_Target and UpStep_Target3 sum;
The 3rd raises renewal value upgrades submodule, raises renewal value for described SNR_Target being updated to the described the 3rd.
11. according to the device described in claim 9 or 10, it is characterized in that, described update module comprises:
First lowers renewal value calculating sub module, obtains the first downward renewal value for calculating the difference of described Present_SNR_Target and DownStep_Target1;
First lowers renewal value upgrades submodule, lowers renewal value for described SNR_Target being updated to described first;
And/or,
Second lowers renewal value calculating sub module, obtains the second rise renewal value for calculating the difference of described Present_SNR_Target and DownStep_Target2;
Second lowers renewal value upgrades submodule, lowers renewal value for described SNR_Target being updated to described second;
And/or,
The 3rd lowers renewal value calculating sub module, obtains the 3rd downward renewal value for calculating the difference of described Present_SNR_Target and DownStep_Target3;
The 3rd lowers renewal value upgrades submodule, lowers renewal value for described SNR_Target being updated to the described the 3rd.
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