CN103840864B - The method and device that a kind of TDS external circule power controls signal to noise ratio updates - Google Patents
The method and device that a kind of TDS external circule power controls signal to noise ratio updates Download PDFInfo
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- CN103840864B CN103840864B CN201410065522.XA CN201410065522A CN103840864B CN 103840864 B CN103840864 B CN 103840864B CN 201410065522 A CN201410065522 A CN 201410065522A CN 103840864 B CN103840864 B CN 103840864B
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Abstract
The invention provides the method and device that a kind of TDS external circule power controls signal to noise ratio updates, methods described includes：Current bLock error rate Present_BLER, current goal signal to noise ratio Present_SNR_Target are obtained, current up-regulation step-length Present_UpStep, and, it is current to lower step-length Present_DownStep；Judge whether the Present_BLER is more than preset target block error rate BLER_Target；If so, then determining target signal to noise ratio SNR_Target target up-regulation step-length UpStep_Target according to the Present_SNR_Target and Present_UpStep；If it is not, the target for then determining target signal to noise ratio SNR_Target according to the Present_SNR_Target and Present_DownStep lowers step-length DownStep_Target；According to the Present_SNR_Target, and, UpStep_Target and/or DownStep_Target update the SNR_Target.The present invention is to allow SNR_Target to be operated in the range of linearity, it is to avoid excessive or too small for a long time so that it is more preferable that external circule power control and inner-loop power control mechanism coordinate, and reduces the fluctuation of radio link quality.
Description
Technical field
The present invention relates to mobile communication technology field, the method that more particularly to a kind of TDS external circule power controls signal to noise ratio updates,
And, the device that a kind of TDS external circule power controls signal to noise ratio updates.
Background technology
In TDS, (Time Division-Synchronous Code Division Multiple Access, the time-division is same
Walk CDMA access) in, RNC (Radio Network Controller, radio network controller) is according to transmission channel
BLER（Block Error Ratio, bLock error rate）Statistical result is to target signal ratio SNR Target（Signal Noise
Ratio, signal to noise ratio）Doing increases/the adjustment of reduction, if adjusting step is fixed, it is easy to cause occur SNR Target tonings
Phenomenon, make SNR_Target long-term works in higher region.
Closed-loop power control be in TDS progress a kind of important mode of power control system, closed-loop power control can be subdivided into external circule power control and
Inner-loop power control.During existing external circule power control, signal to noise ratio adjusting step（Including up-regulation step-length and downward step-length）It is one
Fixed value, this design no doubt has the advantages that realization is easy, but in real transmission environment, BLER and SNR_
Target is not simple linear relationship, but is changed with the change of environment, it is thus possible to there is problems with：If step
Long selection is excessive, may result in power control amplitude beyond required amplitude, such as upper timing excessively high improves the upper of certain user
Row power, makes its BLER far beyond required desired value, will produce interference to other users, lower timing can be used again
The power at family can not meet normal communication needs；If step-length selection is too small, the adjustment that may result in power does not catch up with
The change of environment, particularly when transmission environment drastically changes, can cause the adjustment repeatedly of power, increase RNC power control frequency,
Reduce TDS frequency stability again simultaneously.
Therefore, one of the problem of those skilled in the art are in the urgent need to address is, proposes a kind of TDS external circule power controls noise
Than the method for renewal, and, the device that a kind of TDS external circule power controls signal to noise ratio updates, SNR_Target can be operated in
The range of linearity, it is to avoid excessive or too small for a long time so that it is more preferable that external circule power control and inner-loop power control mechanism coordinate, is reduced wireless
The fluctuation of link-quality.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of method that TDS external circule power controls signal to noise ratio updates, to allow
SNR_Target can be operated in the range of linearity, it is to avoid excessive or too small for a long time so that external circule power control and inner-loop power control machine
It is more preferable that system coordinates, and reduces the fluctuation of radio link quality.
Accordingly, present invention also offers the device that a kind of TDS external circule power controls signal to noise ratio updates.
In order to solve the above problems, the invention discloses a kind of method that TDS external circule power controls signal to noise ratio updates, including：
Obtain current bLock error rate Present_BLER, current goal signal to noise ratio Present_SNR_Target, it is current on
The long Present_UpStep of pacing, and, it is current to lower step-length Present_DownStep；
Judge whether the Present_BLER is more than preset target block error rate BLER_Target；
If so, then determining target signal to noise ratio SNR_ according to the Present_SNR_Target and Present_UpStep
Target target up-regulation step-length UpStep_Target；
If it is not, then determining target signal to noise ratio SNR_ according to the Present_SNR_Target and Present_DownStep
Target target lowers step-length DownStep_Target；
According to the Present_SNR_Target, and, UpStep_Target and/or DownStep_Target update
The SNR_Target.
Preferably, it is described to determine target signal to noise ratio SNR_ according to Present_SNR_Target and Present_UpStep
The step of Target target up-regulation step-length UpStep_Target, includes：
Judge whether the Present_SNR_Target is less than preset lower limit threshold value Low_Bound, and/or, more than pre-
Put upper limit threshold Up_Bound；
If the Present_SNR_Target is less than Low_Bound, the up regulation coefficient of preset first is calculated
COEF_U_1 and Present_UpStep product, obtains first object up-regulation step-length UpStep_Target1；
If the Present_SNR_Target is more than Up_Bound, the up regulation coefficient of preset first is calculated
COEF_U_2 and Present_UpStep product, obtains the second target up-regulation step-length UpStep_Target2；
If the Present_SNR_Target is more than Low_Bound, and less than Up_Bound, then obtains described
Present_UpStep is the 3rd target up-regulation step-length UpStep_Target3.
Preferably, it is described to determine target signal to noise ratio SNR_ according to Present_SNR_Target and Present_DownStep
The step of Target target lowers step-length DownStep_Target includes：
Judge whether the Present_SNR_Target is less than preset lower limit threshold value Low_Bound；
If the Present_SNR_Target is less than Low_Bound, the descending regulation coefficient of preset first is calculated
COEF_D_1 and Present_DownStep product, obtains first object and lowers step-length DownStep_Target1；
If the Present_SNR_Target is more than Up_Bound, the descending regulation coefficient of preset first is calculated
COEF_D_2 and Present_DownStep product, obtains the second target and lowers step-length DownStep_Target2；
If the Present_SNR_Target is more than Low_Bound, and less than Up_Bound, then obtains described
Present_DownStep is that the 3rd target lowers step-length DownStep_Target3.
Preferably, it is described according to Present_SNR_Target, and, UpStep_Target and/or DownStep_
The step of Target updates the SNR_Target includes：
Calculate the Present_SNR_Target and obtain the first up-regulation updated value with UpStep_Target1 sums；
The SNR_Target is updated to the first up-regulation updated value；
And/or,
Calculate the Present_SNR_Target and obtain the second up-regulation updated value with UpStep_Target2 sums；
The SNR_Target is updated to the second up-regulation updated value；
And/or,
Calculate the Present_SNR_Target and obtain the 3rd up-regulation updated value with UpStep_Target3 sums；
The SNR_Target is updated to the 3rd up-regulation updated value.
Preferably, it is described according to Present_SNR_Target, and, UpStep_Target and/or DownStep_
The step of Target updates the SNR_Target includes：
The difference for calculating the Present_SNR_Target and DownStep_Target1 obtains the first downward updated value；
The SNR_Target is updated to described first and lowers updated value；
And/or,
The difference for calculating the Present_SNR_Target and DownStep_Target2 obtains the second up-regulation updated value；
The SNR_Target is updated to described second and lowers updated value；
And/or,
The difference for calculating the Present_SNR_Target and DownStep_Target3 obtains the 3rd downward updated value；
The SNR_Target is updated to the described 3rd and lowers updated value.
Preferably, the COEF_U_1 is 1.2, and the COEF_U_2 is 0.3, and the COEF_D_1 is 0.5, described
COEF_D_2 is 1.5, and the Low_Bound is 4db, and the Up_Bound is 7.5db.
The embodiment of the invention also discloses the device that a kind of TDS external circule power controls signal to noise ratio updates, including：
Acquisition module, for obtaining current bLock error rate Present_BLER, current goal signal to noise ratio Present_SNR_
Target, current up-regulation step-length Present_UpStep, and, it is current to lower step-length Present_DownStep；
Judge module, for judging whether the Present_BLER is more than preset target block error rate BLER_
Target；If so, up-regulation module is then called, if it is not, then calling downward module；
Module is raised, for determining target signal to noise ratio according to the Present_SNR_Target and Present_UpStep
SNR_Target target up-regulation step-length UpStep_Target；
Module is lowered, for determining target signal according to the Present_SNR_Target and Present_DownStep
Target than SNR_Target lowers step-length DownStep_Target；
Update module, for according to the Present_SNR_Target, and, UpStep_Target and/or
DownStep_Target updates the SNR_Target.
Preferably, the up-regulation module includes：
Threshold decision submodule is raised, for judging whether the Present_SNR_Target is less than preset lower limit threshold value
Low_Bound, and/or, more than preset upper limit threshold value Up_Bound；If the Present_SNR_Target is less than Low_
Bound, then call, if the Present_SNR_Target is more than Up_Bound, calls, if the Present_SNR_
Target is more than Low_Bound, and less than Up_Bound, then calls；
First up-regulation step-length acquisition submodule, the first up regulation coefficient COEF_U_1 preset for calculating with
Present_UpStep product, obtains first object up-regulation step-length UpStep_Target1；
Second up-regulation step-length acquisition submodule, the first up regulation coefficient COEF_U_2 preset for calculating with
Present_UpStep product, obtains the second target up-regulation step-length UpStep_Target2；
3rd up-regulation step-length acquisition submodule, is the 3rd target up-regulation step-length for obtaining the Present_UpStep
UpStep_Target3。
Preferably, the downward module includes：
Threshold decision submodule is lowered, for judging whether the Present_SNR_Target is less than preset lower limit threshold value
Low_Bound；If the Present_SNR_Target is less than Low_Bound, the first downward step-length acquisition submodule is called,
If the Present_SNR_Target is more than Up_Bound, the second downward step-length acquisition submodule is called, if described
Present_SNR_Target is more than Low_Bound, and less than Up_Bound, then calls the 3rd downward step-length acquisition submodule;
First lowers step-length acquisition submodule, the first descending regulation coefficient COEF_D_1 preset for calculating with
Present_DownStep product, obtains first object and lowers step-length DownStep_Target1；
Second lowers step-length acquisition submodule, the first descending regulation coefficient COEF_D_2 preset for calculating with
Present_DownStep product, obtains the second target and lowers step-length DownStep_Target2；
3rd lowers step-length acquisition submodule, is the 3rd target downward step-length for obtaining the Present_DownStep
DownStep_Target3。
Preferably, the update module includes：
First up-regulation updated value calculating sub module, for calculating the Present_SNR_Target and UpStep_
Target1 sums obtain first and raise updated value；
First up-regulation updated value updates submodule, is updated for the SNR_Target to be updated into first up-regulation
Value；
And/or,
Second up-regulation updated value calculating sub module, for calculating the Present_SNR_Target and UpStep_
Target2 sums obtain second and raise updated value；
Second up-regulation updated value updates submodule, is updated for the SNR_Target to be updated into second up-regulation
Value；
And/or,
3rd up-regulation updated value calculating sub module, for calculating the Present_SNR_Target and UpStep_
Target3 sums obtain the 3rd and raise updated value；
3rd up-regulation updated value updates submodule, is updated for the SNR_Target to be updated into the 3rd up-regulation
Value.
Preferably, the update module includes：
First lowers updated value calculating sub module, for calculating the Present_SNR_Target and DownStep_
Target1 difference obtains first and lowers updated value；
First, which lowers updated value, updates submodule, and renewal is lowered for the SNR_Target to be updated into described first
Value；
And/or,
Second lowers updated value calculating sub module, for calculating the Present_SNR_Target and DownStep_
Target2 difference obtains second and raises updated value；
Second, which lowers updated value, updates submodule, and renewal is lowered for the SNR_Target to be updated into described second
Value；
And/or,
3rd lowers updated value calculating sub module, for calculating the Present_SNR_Target and DownStep_
Target3 difference obtains the 3rd and lowers updated value；
3rd, which lowers updated value, updates submodule, and renewal is lowered for the SNR_Target to be updated into the described 3rd
Value.
Compared with prior art, the present invention includes advantages below：
In embodiments of the present invention, entered in external circule power control adjusting step according to BLER and SNR linear relationship by region
Row is divided.In the region that BLER and SNR are linear, adjusting step is fixed.And in BLER and SNR into the area of non-linear relation
Domain, adjusting step is not fixed.Wherein, for region relatively low current SNR _ Target, downward step-length is smaller, and up-regulation step-length is more
Greatly, it is ensured that SNR_Target is more to be operated in the range of linearity；For the higher regions of current SNR _ Target, step-length is lowered more
Greatly, up-regulation step-length is smaller, it is ensured that SNR_Target is more to be operated in the range of linearity.
The embodiment of the present invention compares Present_BLER and BLER_Target during external circule power control, and according to comparing
As a result, Present_SNR_Target adjusting step is determined, the Present_SNR_Target of determination adjusting step is utilized
Dynamic adjustment SNR_Target.Because the embodiment of the present invention can be according to reality in different BLER and SNR relationship area
Situation accordingly use different step-length adjustment modes, SNR_Target is dynamically adjusted with this, allows SNR_Target can
The range of linearity is operated in, the larger situation of change of network environment is adapted to, it is to avoid excessive or too small for a long time so that external circule power control
More preferable, the effective number of times for reducing power saltus step coordinated with inner-loop power control mechanism, makes power quickly be adjusted to required model
Within enclosing, the fluctuation of radio link quality is reduced.
Brief description of the drawings
Fig. 1 is a kind of step flow chart of the embodiment of the method for TDS external circule power controls signal to noise ratio renewal of the present invention；
Fig. 2 is the logarithm value and SNR relation schematic diagram of BLER in a kind of speech business of the invention；
Fig. 3 is a kind of structured flowchart of the device embodiment of TDS external circule power controls signal to noise ratio renewal of the present invention.
Embodiment
In order to facilitate the understanding of the purposes, features and advantages of the present invention, it is below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is further detailed explanation.
In current scheme, RNC during the SNR Target adjustment in external circule power control for only considering current BLER
With target block error rate BLER Target magnitude relationship, specific 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, up-regulation step-length UpStep and lower step-length DownStep be it is fixed, no matter current mesh
It is how many to mark signal to noise ratio Present_SNR_Target, and adjusting step is constant.
When SNR Target are in itself than larger（For example more than 10db）, now cause current bLock error rate
The reason for Present_BLER is high is not that SNR_Target is too small, and is due to that interference or other reasonses inner-loop power control are adjusted
As a result SNR_Target requirement is not reached.The gain that SNR Target are now raised again for BLER is very small, if also after
Continue according to fixed step size（0.8db）Up-regulation is very unreasonable.Conversely, in the region of SNR_Target very littles, working as Present
When BLER is still less than BLER_Target, SNR_Target is reduced still according to original step-length, as a result causes SNR_Target
The value of very little is reduced to, causes link for random fluctuation poor anti jamming capability.
Current scheme can cause following problem：First aspect is in very big in Present_SNR_Target
Region when, lifting SNR_Target is few for BLER gain；Second aspect can cause terminal long-time high power transmission, together
When can also cause strong jamming to other cells；The third aspect is still big in the case where Present_SNR_Target is so high
Step-length is raised, and after the radio link quality between UE and base station improves, because SNR_Target is too high, causes Radio Link
In upper zone SNR_Target toning occurs for SNR long-term works.Fourth aspect be in Present_SNR_Target
The region of very little, still big step lowers SNR_Target, SNR_Target can be caused too low, and link interference free performance declines.
In order to solve the above problems, inventor herein creatively proposes that one of the core concepts of the embodiments of the present invention exists
In adjusting step is constant in BLER and SNR linear region, you can adjust SNR_Target based on fixed step size.
Outside BLER and SNR linear region, then for the less regions of current SNR _ Target, up-regulation step-length suitably increases
Greatly, step-length is lowered suitably to diminish；For the region that current SNR _ Target is larger, up-regulation step-length suitably diminishes, and lowers step-length and fits
Work as increase.SNR Target are dynamically adjusted according to Present_BLER, allow SNRTarget to be more operated in the range of linearity,
Improve link interference free performance.
Embodiment one：
Reference picture 1, shows the step flow for the embodiment of the method that a kind of TDS external circule power controls signal to noise ratio of the invention updates
Figure, specifically may include steps of：
Step 101, current bLock error rate Present_BLER, current goal signal to noise ratio Present_SNR_ are obtained
Target, current up-regulation step-length Present_UpStep, and, it is current to lower step-length Present_DownStep；
In the specific implementation, SNR（Signal to Noise Ratio, signal to noise ratio）, also known as signal to noise ratio, signal to noise ratio number
Value is higher, and noise is smaller, and equipment antijamming capability is high.
The target for carrying out power control is that the quality of service for ensureing Radio Link meets the requirements, and quality of service can be characterized with BLER.
Under different transmission environments, BLER is different from SNR corresponding relation, it is therefore desirable to open sea wharf according to
Present_BLER adjusts SNR_Target in real time, to ensure normal QoS requirement.Open sea wharf is exactly to be
Inner-loop power control provides dynamic SNR_Target.
Step 102, judge whether the Present_BLER is more than preset target block error rate BLER_Target；If
It is then to perform step 103, if it is not, then performing step 104；
In embodiments of the present invention, can be according to the TDS preset appropriate BLER_Target of actual conditions, the present invention is real
Example is applied without not being restricted to this.
Step 103, target signal to noise ratio SNR_ is determined according to the Present_SNR_Target and Present_UpStep
Target target up-regulation step-length UpStep_Target；
In one preferred embodiment of the invention, the step 103 can specifically include following sub-step：
Whether sub-step S11, judge the Present_SNR_Target less than preset lower limit threshold value Low_Bound, and/
Or, more than preset upper limit threshold value Up_Bound；If the Present_SNR_Target is less than Low_Bound, sub-step is performed
Rapid S12, if the Present_SNR_Target is more than Up_Bound, performs sub-step S13, if the Present_SNR_
Target is more than Low_Bound, and less than Up_Bound, then performs sub-step S14；
Sub-step S12, calculates the first preset up regulation coefficient COEF_U_1 and Present_UpStep product, obtains
First object up-regulation step-length UpStep_Target1；
Sub-step S13, calculates the first preset up regulation coefficient COEF_U_2 and Present_UpStep product, obtains
Second target up-regulation step-length UpStep_Target2；
Sub-step S14, it is the 3rd target up-regulation step-length UpStep_Target3 to obtain the Present_UpStep.
It should be noted that the division in the region of BLER and SNR relations, for being less than in Present_SNR_Target
Low_Bound region, and, it is more than Up_Bound in Present_SNR_Target, it is believed that be BLER and SNR into non-linear
The region of relation, Present_SNR_Target be less than Up_Bound, the region more than Low_Bound, it is believed that be BLER and
Region linear SNR.Wherein, the Low_Bound can be 4db, and the Up_Bound can be 7.5db, certainly,
In actual applications, can accordingly it be divided according to actual conditions, or even using the dividing mode of multistage, the embodiment of the present invention
This is not restricted.
In a kind of example of concrete application of the present invention, if Present_BLER is more than BLER_Target, and in BLER
With SNR outside linear region, because the environment of now transmission channel is more unstable, then according to Present_SNR_
The Target corresponding adjusting step of size.Specifically, if Present_SNR_Target is less than Low_Bound, step-length is raised
Appropriate increase；If Present_SNR_Target is more than Up_Bound, up-regulation step-length suitably diminishes, and SNR_ is adjusted with this
Target。
If Present_BLER is more than BLER_Target, and in BLER and SNR linear region, then foundation
Fixed step size adjusts SNR_Target.Specifically, if Present_SNR_Target is less than Up_Bound, more than Low_
Bound, because the environment of now transmission channel is relatively stable, can adjust SNR_Target according to fixed step size.
Step 104, target signal to noise ratio is determined according to the Present_SNR_Target and Present_DownStep
SNR_Target target lowers step-length DownStep_Target；
In one preferred embodiment of the invention, the step 104 can specifically include following sub-step：
Sub-step S21, judges whether the Present_SNR_Target is less than preset lower limit threshold value Low_Bound；If
The Present_SNR_Target is less than Low_Bound, then sub-step S22 is performed, if the Present_SNR_Target
More than Up_Bound, then sub-step S23 is performed, if the Present_SNR_Target is more than Low_Bound, and less than Up_
Bound, then perform sub-step S24；
Sub-step S22, calculates the first preset descending regulation coefficient COEF_D_1 and Present_DownStep product, obtains
Obtain first object and lower step-length DownStep_Target1；
Sub-step S23, calculates the first preset descending regulation coefficient COEF_D_2 and Present_DownStep product, obtains
Obtain the second target and lower step-length DownStep_Target2；
Sub-step S24, obtains the Present_DownStep and lowers step-length DownStep_Target3 for the 3rd target.
In another example of concrete application of the present invention, if Present_BLER is less than BLER_Target, and
Outside region linear BLER and SNR, because the environment of now transmission channel is more unstable, then according to Present_
The SNR_Target corresponding adjusting step of size.Specifically, if Present_SNR_Target is less than Low_Bound, lower
Step-length suitably diminishes；If Present_SNR_Target is more than Up_Bound, lowers step-length and suitably increase, SNR_ is adjusted with this
Target。
If Present_BLER is less than BLER_Target, and in BLER and SNR linear region, then foundation
Fixed step size adjusts SNR_Target.Specifically, if Present_SNR_Target is less than Up_Bound, more than Low_
Bound, because the environment of now transmission channel is relatively stable, can adjust SNR_Target according to fixed step size.
In actual applications, when needing to be adjusted step sizes, directly using coefficient to up-regulation step-length and downward
Step-length is adjusted, specifically, the COEF_U_1 can be 1.2, it is described can be using COEF_U_2 as 0.3, the COEF_
D_1 can be 0.5, and the COEF_D_2 can be 1.5, certainly, and the regulation coefficient of step-length can also be worth using other, or
Person, corresponding function is used according to transmission environment, and the embodiment of the present invention is not restricted to this.
Step 105, according to the Present_SNR_Target, and, UpStep_Target and/or DownStep_
Target updates the SNR_Target.
In one preferred embodiment of the invention, the step 105 can specifically include following sub-step：
Sub-step S31, calculates the Present_SNR_Target and obtains the first up-regulation with UpStep_Target1 sums
Updated value；
Sub-step S32, the first up-regulation updated value is updated to by the SNR_Target；
And/or,
Sub-step S41, calculates the Present_SNR_Target and obtains the second up-regulation with UpStep_Target2 sums
Updated value；
Sub-step S42, the second up-regulation updated value is updated to by the SNR_Target；
And/or,
Sub-step S51, calculates the Present_SNR_Target and obtains the 3rd up-regulation with UpStep_Target3 sums
Updated value；
Sub-step S52, the 3rd up-regulation updated value is updated to by the SNR_Target.
In present invention application example, can according to Present_BLER and BLER_Target comparative result, and,
BLER and SNR corresponding relation determines UpStep_Target size, calculates UpStep_Target and Present_SNR_
Target sums update SNR_Target.
In one preferred embodiment of the invention, the step 105 can specifically include following sub-step：
Sub-step S61, the difference for calculating the Present_SNR_Target and DownStep_Target1 is obtained under first
Adjust updated value；
Sub-step S62, is updated to described first by the SNR_Target and lowers updated value；
And/or,
Sub-step S71, the difference for calculating the Present_SNR_Target and DownStep_Target2 is obtained on second
Adjust updated value；
Sub-step S72, is updated to described second by the SNR_Target and lowers updated value；
And/or,
Sub-step S81, the difference for calculating the Present_SNR_Target and DownStep_Target3 is obtained under the 3rd
Adjust updated value；
Sub-step S82, is updated to the described 3rd by the SNR_Target and lowers updated value.
Equally, in present invention application example, can according to Present_BLER and BLER_Target comparative result,
And, BLER and SNR corresponding relation determines DownStep_Target size, and calculate DownStep_Target and
Present_SNR_Target sums update SNR_Target.
In embodiments of the present invention, entered in external circule power control adjusting step according to BLER and SNR linear relationship by region
Row is divided.In the region that BLER and SNR are linear, adjusting step is fixed.And in BLER and SNR into the area of non-linear relation
Domain, adjusting step is not fixed.Wherein, for region relatively low current SNR _ Target, downward step-length is smaller, and up-regulation step-length is more
Greatly, it is ensured that SNR_Target is more to be operated in the range of linearity；For the higher regions of current SNR _ Target, step-length is lowered more
Greatly, up-regulation step-length is smaller, it is ensured that SNR_Target is more to be operated in the range of linearity.
In order that it is further understood that the embodiment of the present invention, is said using specific example below
It is bright.
BLER logarithm value and SNR relation schematic diagram in a kind of speech business of the invention shown in reference picture 2, with
Exemplified by AMR12.2K speech businesses, from this as can be seen that being BLER logarithm value and SNR in 4~7.5db regional extents in SNR
Substantially linear relationship, as SNR is from 4db to 7.5db, BLER drops to 0.1% from 30% or so.In this case, may be used
So that the lower limit of the range of linearity is set into 4db, the upper limit is set to 7.5db, specifically：
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, Present_BLER and BLER_Target are compared during external circule power control, and according to
Comparative result, determines Present_SNR_Target adjusting step, utilizes the Present_SNR_Target of determination adjustment
Step-length dynamically adjusts SNR_Target.Because the embodiment of the present invention can basis in different BLER and SNR relationship area
Actual situation accordingly uses different step-length adjustment modes, and SNR_Target is dynamically adjusted with this, allows SNR_Target
The range of linearity can be operated in, the larger situation of change of network environment is adapted to, it is to avoid excessive or too small for a long time so that outer shroud
It is more preferable that power control and inner-loop power control mechanism coordinate, and effectively reduces the number of times of power saltus step, power is quickly adjusted to required
Within the scope of, reduce the fluctuation of radio link quality.
It should be noted that for embodiment of the method, in order to be briefly described, therefore it to be all expressed as to a series of action group
Close, but those skilled in the art should know, the application is not limited by described sequence of movement, because according to this Shen
Please, some steps can be carried out sequentially or simultaneously using other.Secondly, those skilled in the art should also know, specification
Described in embodiment belong to necessary to preferred embodiment, involved action not necessarily the application.
Embodiment two：
Reference picture 3, shows the structural frames for the device embodiment that a kind of TDS external circule power controls signal to noise ratio of the present invention updates
Figure, can specifically include following module：
Acquisition module 301, for obtaining current bLock error rate Present_BLER, current goal signal to noise ratio Present_
SNR_Target, current up-regulation step-length Present_UpStep, and, it is current to lower step-length Present_DownStep；
Judge module 302, for judging whether the Present_BLER is more than preset target block error rate BLER_
Target；If so, up-regulation module is then called, if it is not, then calling downward module；
Module 303 is raised, for determining that target is believed according to the Present_SNR_Target and Present_UpStep
The target up-regulation step-length UpStep_Target made an uproar than SNR_Target；
Module 304 is lowered, for determining target according to the Present_SNR_Target and Present_DownStep
Signal to noise ratio snr _ Target target lowers step-length DownStep_Target；
In one preferred embodiment of the invention, the up-regulation module 303 can include following submodule：
Threshold decision submodule is raised, for judging whether the Present_SNR_Target is less than preset lower limit threshold value
Low_Bound, and/or, more than preset upper limit threshold value Up_Bound；If the Present_SNR_Target is less than Low_
Bound, then call, if the Present_SNR_Target is more than Up_Bound, calls, if the Present_SNR_
Target is more than Low_Bound, and less than Up_Bound, then calls；
First up-regulation step-length acquisition submodule, the first up regulation coefficient COEF_U_1 preset for calculating with
Present_UpStep product, obtains first object up-regulation step-length UpStep_Target1；
Second up-regulation step-length acquisition submodule, the first up regulation coefficient COEF_U_2 preset for calculating with
Present_UpStep product, obtains the second target up-regulation step-length UpStep_Target2；
3rd up-regulation step-length acquisition submodule, is the 3rd target up-regulation step-length for obtaining the Present_UpStep
UpStep_Target3。
In one preferred embodiment of the invention, the downward module 304 can include following submodule：
Threshold decision submodule is lowered, for judging whether the Present_SNR_Target is less than preset lower limit threshold value
Low_Bound；If the Present_SNR_Target is less than Low_Bound, the first downward step-length acquisition submodule is called,
If the Present_SNR_Target is more than Up_Bound, the second downward step-length acquisition submodule is called, if described
Present_SNR_Target is more than Low_Bound, and less than Up_Bound, then calls the 3rd downward step-length acquisition submodule;
First lowers step-length acquisition submodule, the first descending regulation coefficient COEF_D_1 preset for calculating with
Present_DownStep product, obtains first object and lowers step-length DownStep_Target1；
Second lowers step-length acquisition submodule, the first descending regulation coefficient COEF_D_2 preset for calculating with
Present_DownStep product, obtains the second target and lowers step-length DownStep_Target2；
3rd lowers step-length acquisition submodule, is the 3rd target downward step-length for obtaining the Present_DownStep
DownStep_Target3。
Update module 305, for according to the Present_SNR_Target, and, UpStep_Target and/or
DownStep_Target updates the SNR_Target.
In one preferred embodiment of the invention, the update module 305 can include following submodule：
First up-regulation updated value calculating sub module, for calculating the Present_SNR_Target and UpStep_
Target1 sums obtain first and raise updated value；
First up-regulation updated value updates submodule, is updated for the SNR_Target to be updated into first up-regulation
Value；
And/or,
Second up-regulation updated value calculating sub module, for calculating the Present_SNR_Target and UpStep_
Target2 sums obtain second and raise updated value；
Second up-regulation updated value updates submodule, is updated for the SNR_Target to be updated into second up-regulation
Value；
And/or,
3rd up-regulation updated value calculating sub module, for calculating the Present_SNR_Target and UpStep_
Target3 sums obtain the 3rd and raise updated value；
3rd up-regulation updated value updates submodule, is updated for the SNR_Target to be updated into the 3rd up-regulation
Value.
In one preferred embodiment of the invention, the update module 305 can include following submodule：
First lowers updated value calculating sub module, for calculating the Present_SNR_Target and DownStep_
Target1 difference obtains first and lowers updated value；
First, which lowers updated value, updates submodule, and renewal is lowered for the SNR_Target to be updated into described first
Value；
And/or,
Second lowers updated value calculating sub module, for calculating the Present_SNR_Target and DownStep_
Target2 difference obtains second and raises updated value；
Second, which lowers updated value, updates submodule, and renewal is lowered for the SNR_Target to be updated into described second
Value；
And/or,
3rd lowers updated value calculating sub module, for calculating the Present_SNR_Target and DownStep_
Target3 difference obtains the 3rd and lowers updated value；
3rd, which lowers updated value, updates submodule, and renewal is lowered for the SNR_Target to be updated into the described 3rd
Value.
For device embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, it is related
Part illustrates referring to the part of embodiment of the method.
Each embodiment in this specification is described by the way of progressive, what each embodiment was stressed be with
Between the difference of other embodiment, each embodiment identical similar part mutually referring to.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, device or computer program
Product.Therefore, the application can be using the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the application can be used in one or more computers for wherein including computer usable program code
The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The application is the flow with reference to method, equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram are described.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which is produced, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
Although having been described for the preferred embodiment of the application, those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to include excellent
Select embodiment and fall into having altered and changing for the application scope.
Finally, in addition it is also necessary to explanation, herein, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between there is any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, method, article or equipment including a series of key elements not only include that
A little key elements, but also other key elements including being not expressly set out, or also include be this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged
Except also there is other identical element in the process including the key element, method, article or equipment.
The method updated above to a kind of TDS external circule power controls signal to noise ratio provided by the present invention, and, a kind of TDS outer shrouds
The device that power control signal to noise ratio updates, is described in detail, principle and implementation of the specific case used herein to the present invention
Mode is set forth, and the explanation of above example is only intended to the method and its core concept for helping to understand the present invention；Meanwhile,
For those of ordinary skill in the art, according to the thought of the present invention, have change in specific embodiments and applications
Become part, in summary, this specification content should not be construed as limiting the invention.
Claims (12)
1. a kind of method that TDS external circule power controls signal to noise ratio updates, it is characterised in that including：
Current bLock error rate Present_BLER, current goal signal to noise ratio Present_SNR_Target are obtained, currently upper pacing
Long Present_UpStep, and, it is current to lower step-length Present_DownStep；
Judge whether the Present_BLER is more than preset target block error rate BLER_Target；
If so, then determining target signal to noise ratio SNR_Target according to the Present_SNR_Target and Present_UpStep
Target up-regulation step-length UpStep_Target；
If it is not, then determining target signal to noise ratio SNR_ according to the Present_SNR_Target and Present_DownStep
Target target lowers step-length DownStep_Target；
According to the Present_SNR_Target, and, UpStep_Target and/or DownStep_Target update described
SNR_Target。
2. according to the method described in claim 1, it is characterised in that described according to Present_SNR_Target and Present_
The step of UpStep determines target signal to noise ratio SNR_Target target up-regulation step-length UpStep_Target includes：
Judge whether the Present_SNR_Target is less than preset lower limit threshold value Low_Bound, and/or, on preset
Limit threshold value Up_Bound；
If the Present_SNR_Target is less than Low_Bound, the up regulation coefficient COEF_U_ of preset first is calculated
1 and Present_UpStep product, obtains first object up-regulation step-length UpStep_Target1；
If the Present_SNR_Target is more than Up_Bound, the up regulation coefficient COEF_U_2 of preset first is calculated
With Present_UpStep product, the second target up-regulation step-length UpStep_Target2 is obtained；
If the Present_SNR_Target is more than Low_Bound, and less than Up_Bound, then obtains the Present_
UpStep is the 3rd target up-regulation step-length UpStep_Target3.
3. according to the method described in claim 1, it is characterised in that described according to Present_SNR_Target and Present_
DownStep determines that the step of target signal to noise ratio SNR_Target target lowers step-length DownStep_Target includes：
Judge whether the Present_SNR_Target is less than preset lower limit threshold value Low_Bound, and/or, on preset
Limit threshold value Up_Bound；
If the Present_SNR_Target is less than Low_Bound, the descending regulation coefficient COEF_D_ of preset first is calculated
1 and Present_DownStep product, obtains first object and lowers step-length DownStep_Target1；
If the Present_SNR_Target is more than Up_Bound, the descending regulation coefficient COEF_D_2 of preset first is calculated
With Present_DownStep product, obtain the second target and lower step-length DownStep_Target2；
If the Present_SNR_Target is more than Low_Bound, and less than Up_Bound, then obtains the Present_
DownStep is that the 3rd target lowers step-length DownStep_Target3.
4. method according to claim 2, it is characterised in that described according to Present_SNR_Target, and,
The step of UpStep_Target and/or DownStep_Target updates the SNR_Target includes：
Calculate the Present_SNR_Target and obtain the first up-regulation updated value with UpStep_Target1 sums；
The SNR_Target is updated to the first up-regulation updated value；
And/or,
Calculate the Present_SNR_Target and obtain the second up-regulation updated value with UpStep_Target2 sums；
The SNR_Target is updated to the second up-regulation updated value；
And/or,
Calculate the Present_SNR_Target and obtain the 3rd up-regulation updated value with UpStep_Target3 sums；
The SNR_Target is updated to the 3rd up-regulation updated value.
5. the method according to claim 3 or 4, it is characterised in that described according to Present_SNR_Target, and,
The step of UpStep_Target and/or DownStep_Target updates the SNR_Target includes：
The difference for calculating the Present_SNR_Target and DownStep_Target1 obtains the first downward updated value；
The SNR_Target is updated to described first and lowers updated value；
And/or,
The difference for calculating the Present_SNR_Target and DownStep_Target2 obtains the second downward updated value；
The SNR_Target is updated to described second and lowers updated value；
And/or,
The difference for calculating the Present_SNR_Target and DownStep_Target3 obtains the 3rd downward updated value；
The SNR_Target is updated to the described 3rd and lowers updated value.
6. method according to claim 2, it is characterised in that the COEF_U_1 is 1.2, the COEF_U_2 is 0.3,
The Low_Bound is 4db, and the Up_Bound is 7.5db.
7. method according to claim 3, it is characterised in that the COEF_D_1 is 0.5, the COEF_D_2 is 1.5.
8. the device that a kind of TDS external circule power controls signal to noise ratio updates, it is characterised in that including：
Acquisition module, for obtaining current bLock error rate Present_BLER, current goal signal to noise ratio Present_SNR_
Target, current up-regulation step-length Present_UpStep, and, it is current to lower step-length Present_DownStep；
Judge module, for judging whether the Present_BLER is more than preset target block error rate BLER_Target；If
It is then to call up-regulation module, if it is not, then calling downward module；
Module is raised, for determining target signal to noise ratio SNR_ according to the Present_SNR_Target and Present_UpStep
Target target up-regulation step-length UpStep_Target；
Module is lowered, for determining target signal to noise ratio according to the Present_SNR_Target and Present_DownStep
SNR_Target target lowers step-length DownStep_Target；
Update module, for according to the Present_SNR_Target, and, UpStep_Target and/or DownStep_
Target updates the SNR_Target.
9. device according to claim 8, it is characterised in that the up-regulation module includes：
Threshold decision submodule is raised, for judging whether the Present_SNR_Target is less than preset lower limit threshold value Low_
Bound, and/or, more than preset upper limit threshold value Up_Bound；If the Present_SNR_Target is less than Low_Bound,
The first up-regulation step-length acquisition submodule is called, if the Present_SNR_Target is more than Up_Bound, is called on second
The long acquisition submodule of pacing, if the Present_SNR_Target is more than Low_Bound, and less than Up_Bound, is then called
3rd up-regulation step-length acquisition submodule；
First up-regulation step-length acquisition submodule, the first up regulation coefficient COEF_U_1 and Present_ preset for calculating
UpStep product, obtains first object up-regulation step-length UpStep_Target1；
Second up-regulation step-length acquisition submodule, the first up regulation coefficient COEF_U_2 and Present_ preset for calculating
UpStep product, obtains the second target up-regulation step-length UpStep_Target2；
3rd up-regulation step-length acquisition submodule, is the 3rd target up-regulation step-length for obtaining the Present_UpStep
UpStep_Target3。
10. device according to claim 8, it is characterised in that the downward module includes：
Threshold decision submodule is lowered, for judging whether the Present_SNR_Target is less than preset lower limit threshold value Low_
Bound, and/or, more than preset upper limit threshold value Up_Bound；If the Present_SNR_Target is less than Low_Bound,
The first downward step-length acquisition submodule is called, if the Present_SNR_Target is more than Up_Bound, is called under second
The long acquisition submodule of pacing, if the Present_SNR_Target is more than Low_Bound, and less than Up_Bound, is then called
3rd lowers step-length acquisition submodule；
First lowers step-length acquisition submodule, the first descending regulation coefficient COEF_D_1 and Present_ preset for calculating
DownStep product, obtains first object and lowers step-length DownStep_Target1；
Second lowers step-length acquisition submodule, the first descending regulation coefficient COEF_D_2 and Present_ preset for calculating
DownStep product, obtains the second target and lowers step-length DownStep_Target2；
3rd lowers step-length acquisition submodule, is the 3rd target downward step-length for obtaining the Present_DownStep
DownStep_Target3。
11. device according to claim 9, it is characterised in that the update module includes：
First up-regulation updated value calculating sub module, for calculate the Present_SNR_Target and UpStep_Target1 it
Updated value is raised with obtaining first；
First up-regulation updated value updates submodule, for the SNR_Target to be updated into the first up-regulation updated value；
And/or,
Second up-regulation updated value calculating sub module, for calculate the Present_SNR_Target and UpStep_Target2 it
Updated value is raised with obtaining second；
Second up-regulation updated value updates submodule, for the SNR_Target to be updated into the second up-regulation updated value；
And/or,
3rd up-regulation updated value calculating sub module, for calculate the Present_SNR_Target and UpStep_Target3 it
Updated value is raised with obtaining the 3rd；
3rd up-regulation updated value updates submodule, for the SNR_Target to be updated into the 3rd up-regulation updated value.
12. the device according to claim 10 or 11, it is characterised in that the update module includes：
First lowers updated value calculating sub module, for calculating the Present_SNR_Target and DownStep_Target1
Difference obtain first lower updated value；
First, which lowers updated value, updates submodule, and updated value is lowered for the SNR_Target to be updated into described first；
And/or,
Second lowers updated value calculating sub module, for calculating the Present_SNR_Target and DownStep_Target2
Difference obtain second lower updated value；
Second, which lowers updated value, updates submodule, and updated value is lowered for the SNR_Target to be updated into described second；
And/or,
3rd lowers updated value calculating sub module, for calculating the Present_SNR_Target and DownStep_Target3
Difference obtain the 3rd lower updated value；
3rd, which lowers updated value, updates submodule, and updated value is lowered for the SNR_Target to be updated into the described 3rd.
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| CN1627655A (en) * | 2003-12-11 | 2005-06-15 | 上海贝尔阿尔卡特股份有限公司 | Implementation method for controlling power in external ring |
| CN101340213A (en) * | 2007-07-06 | 2009-01-07 | 鼎桥通信技术有限公司 | Power control method, system and sending terminal |
| CN102223698A (en) * | 2011-06-07 | 2011-10-19 | 大唐移动通信设备有限公司 | Method and equipment for dynamically adjusting change step length of signal-to-noise ratio in outer-loop power control process |
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| KR101507086B1 (en) * | 2008-08-12 | 2015-03-30 | 삼성전자주식회사 | Apparatus and method for power control in mobile communication system |
| CN103002556B (en) * | 2011-09-13 | 2015-07-22 | 中磊电子（苏州）有限公司 | Power control method and radio network controller |
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| CN1627655A (en) * | 2003-12-11 | 2005-06-15 | 上海贝尔阿尔卡特股份有限公司 | Implementation method for controlling power in external ring |
| CN101340213A (en) * | 2007-07-06 | 2009-01-07 | 鼎桥通信技术有限公司 | Power control method, system and sending terminal |
| CN102223698A (en) * | 2011-06-07 | 2011-10-19 | 大唐移动通信设备有限公司 | Method and equipment for dynamically adjusting change step length of signal-to-noise ratio in outer-loop power control process |
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