CN101068121A - Signal-to-interference ratio target value regulating method and device in outerloop power control - Google Patents

Abstract

A method for regulating object value of signal to jamming ratio includes down-regulating at least once of signal to jammi9ng ratio object value in each external ring control period with service data block error-block rate being continuously lower than object error-block rate, continuously down-regulating object value of signal to jamming ratio after sum-up of over said down-regulation step length is divided by DnStep numbers of external ring control period and making object value down-regulation step length of signal to jamming ratio in each external ring control period be DnStep.

Description

The method of adjustment and the device of signal interference ratio desired value in a kind of exterior ring power control

Technical field

The present invention relates to the power control techniques of mobile communication system, the method for adjustment and the device of signal interference ratio desired value in particularly a kind of exterior ring power control.

Background technology

Wireless cellular network need satisfy certain operation quality requirement for the service that each user provides, yet quality of service is mainly determined by the SIR (Signal-to-Inference Ratio, signal-to-jamming ratio) of each user's received signal.Therefore, wireless cellular network is to wireless resource allocation, and is particularly just more important to the power division of each user link.For CDMA Cellular System, all users use identical frequency range and time slot in the same sub-district, only depend on the orthogonal property (or accurate orthogonal property) of spreading code to isolate mutually between the user.Yet owing to reasons such as the multipath of wireless channel, time-delay make that the their cross correlation between each subscriber signal is undesirable, other user's signal produces active user's signal and disturbs, and this class is disturbed and is called as multiple access and disturbs.Like this, when the increase of user's number or other user power promote in the sub-district, all can increase interference to the active user, cause active user's received signal SIR to descend, when this class interference is arrived to a certain degree greatly, the active user just can not proper communication, therefore cdma system is a serious disturbance constrained system, and the size of interference directly has influence on power system capacity.Address this problem and mainly contain two ways: multiuser detection and power control techniques.Multiuser detection takes into full account the multiple access that exists between the user and disturbs, and by these disturb in receiving terminal reconstruct, eliminates its influence then, improves performance, but algorithm is too complicated.Power control techniques is simple and practical, is considered to one of key technology of cdma system.Power control techniques is adjusted each user's transmitting power, with compensate for channel decline and counteracting near-far interference, each user is maintained on the minimum standard that can keep proper communication, so just can reduce interference the biglyyest, thereby improve power system capacity other users.

Common CDMA power control techniques can be divided into open Loop Power control and closed power control.Transmission power adjustment when open Loop Power control generally is used for determining user's Initial Trans or the sudden change of user's received power, its basic functional principle is to be the principle of constant according to amassing of user's received power and transmitting power, measure the size of received power in advance, and determine the size of transmitting power thus.Open Loop Power control is mainly used to overcome shade and path loss.Open Loop Power control reckons without the asymmetry of uplink and downlink channel electric wave power, thereby its accuracy is difficult to be guaranteed.

Be illustrated in figure 1 as closed power control basic framework figure in the cdma system, closed power control is divided into inner loop power control and exterior ring power control (OLPC:Outer Loop Power Control) again, wherein: UE (User Equipment, subscriber equipment) and the power control section between the NodeB divide and to make inner loop power control, power control section branch between NodeB and the RNC (Radio Network Controller, radio network controller) or the branch of the power control section between RNC and the UE are named exterior ring power control.In exterior ring power control, RNC adjusts the signal interference ratio desired value SIRtar of inner loop power control usually according to the Block Error Rate (BLER:Block Error Rate) of received signal, and SIRtar is sent to NodeB.In inner loop power control, NodeB is by measurement estimated value and the signal interference ratio desired value SIRtar of contrast signal interference ratio SIR, determine power control bit information, by channel power control bit information is sent to transmitting terminal UE then, UE regulates the size of transmitting power according to power control bit information.SIRtar is exactly the correct required signal interference ratio of demodulation useful signal, and under different multi-path environment (translational speed of travelling carriage and the number of multipath etc.), the SIRtar value is different.By closed-loop control, can make system satisfy the requirement of quality of service all the time with minimal power, and have identical power when making each mobile station signal reach the base station at various multi-path environments.

In the existing exterior ring power control, falling SIRtar slowly based on the fast liter of BLER, to adjust the principle of scheme as follows:

$\mathrm{\ΔSIRtar}=\frac{({\mathrm{BLER}}_{\mathrm{meas}}-{\mathrm{BLER}}_{\mathrm{tar}})}{1-{\mathrm{BLER}}_{\mathrm{tar}}}*\mathrm{SIRStepUp}$

Wherein, Δ SIRtar represents the adjustment step-length of SIRtar in the exterior ring power control cycle, BLER _MeasThe actual BLER that measures in the current exterior ring power control cycle of expression business, BLER _TarRepresent the BLER desired value that this is professional, SIRStepUp represents to set the adjustment step-length.

The adjustment principle of falling slowly according to fast liter, generally, as the BLER of a business _MeasBe lower than BLER _TarThe time, then in current exterior ring power control cycle, turn down the SIRtar value, as the BLER of business by Δ SIRtar _MeasBe higher than BLER _TarThe time, then in current exterior ring power control cycle, heighten the SIRtar value by Δ SIRtar.The exterior ring power control cycle be generally Transmission Time Interval TTI (10ms, 20ms, 40ms, 80ms) magnitude, be 10-100Hz.

With BLER _Tar=1%, the exterior ring power control cycle is that 1 TTI is an example, illustrates that existing fast liter falls SIRtar slowly and adjusts principle, in each TTI:

If this TTI data block transmitted is an erroneous block, then Ye Wu BLER _MeasBe 1, $\mathrm{\ΔSIRtar}=\frac{(1-{\mathrm{BLER}}_{\mathrm{tar}})}{1-{\mathrm{BLER}}_{\mathrm{tar}}}*\mathrm{UpStep}=\mathrm{UpStep},$ UpStep is the rise step-length of SIRtar value each time;

If this TTI data block transmitted is correct piece, then Ye Wu BLER _MeasBe 0, $\mathrm{\ΔSIRtar}=\frac{(0-0.01)}{1-0.01}*\mathrm{UpStep}=-\frac{\mathrm{UpStep}}{99},$ Promptly be once to raise 1/99th of step-length UpStep on adjacent in current exterior ring power control cycle with SIRtar value downward modulation step-length, need adjust just and can raise step-length through 99 times recalling to one under the SIRtar value, cause the transmitting mobile stations transmitting power to descend slowly, increased power loss.

In general, the exterior ring power control cycle is 2,3 or more TTI, and it is basic identical to adjust principle, because BLER _TarBe worth very for a short time, each data block that therefore generally only receives in an exterior ring power control cycle all is that correct piece makes and just reduces the SIRtar value, so at BLER _Tar=1% o'clock, the downward modulation step-length in each exterior ring power control cycle all was $\mathrm{\ΔSIRtar}=\frac{(0-0.01)}{1-0.01}*\mathrm{UpStep}=-\frac{\mathrm{UpStep}}{99},$ Raising step-length can change to some extent according to actual Block Error Rate.

As seen, in the method for adjustment of SIRtar value of the prior art, all there is because SIRtar value downward modulation speed is very slow transmission power of mobile station that the cause problem slowly that descends, thereby increased power consumption.

Summary of the invention

The embodiment of the invention provides a kind of method of adjustment and device of signal interference ratio desired value, to reduce power consumption.

A kind of method of adjustment of signal interference ratio desired value is lower than downward modulation signal interference ratio desired value in each outer shroud control cycle of target Block Error Rate continuously at the data block Block Error Rate of business, wherein:

At least reduce the signal interference ratio desired value one time in n exterior ring power control cycle of beginning, wherein the downward modulation step-length sum in n cycle is less than the long UpStep of previous in fact pacing, and the signal interference ratio desired value is reduced step-length greater than DnStep each time, $\mathrm{DnStep}=\frac{({\mathrm{BLER}}_{\mathrm{tar}}-{\mathrm{BLER}}_{\mathrm{meas}1})}{1-{\mathrm{BLER}}_{\mathrm{tar}}}*\mathrm{SIRStepUp},$ Wherein: BLER _TarBe the block error probability desired value of business, BLER _Meas1Be lower than BLER for first _TarActual Block Error Rate, n is more than or equal to 1;

Continue to reduce the signal interference ratio desired value after divided by DnStep outer shroud control cycle surpassing described downward modulation step-length sum, it is DnStep that the signal interference ratio desired value in each outer shroud control cycle is reduced step-length.

Further, in the outer shroud control cycle before beginning to reduce the signal interference ratio desired value each time, be greater than or equal to described target Block Error Rate according to the data block Block Error Rate of business and raise the signal interference ratio desired value, raise step-length and be: $\mathrm{UpStep}=\frac{({\mathrm{BLER}}_{\mathrm{meas}2}-{\mathrm{BLER}}_{\mathrm{tar}})}{1-{\mathrm{BLER}}_{\mathrm{tar}}}*\mathrm{SIRStepUp},$ Wherein: BLER _TarBe the block error probability desired value of business, BLER _Meas2For surpassing BLER _TarActual Block Error Rate, SIRStepUp is for set adjusting step-length.

Signal interference ratio desired value adjusting device in a kind of exterior ring power control comprises:

Judge module is used for judging each exterior ring power control cycle, professional data block Block Error Rate and the relation between the target Block Error Rate, and output judged result;

The downward modulation module, be used for judged result according to described judge module output, data block Block Error Rate in business is lower than in each outer shroud control cycle of target Block Error Rate continuously, at least reduce the signal interference ratio desired value one time, wherein: the downward modulation step-length sum in the n of beginning exterior ring power control cycle is less than the long UpStep of previous in fact pacing, and the step-length of signal interference ratio desired value downward modulation each time is greater than DnStep $\mathrm{DnStep}=\frac{({\mathrm{BLER}}_{\mathrm{tar}}-{\mathrm{BLER}}_{\mathrm{means}1})}{1-{\mathrm{BLER}}_{\mathrm{tar}}}*\mathrm{SIRStepUp},$ Wherein: BLER _TarBe the block error probability desired value of business, BLER _Meas1Be lower than BLER for first _TarActual Block Error Rate, n is more than or equal to 1; And continuing to reduce the signal interference ratio desired value after divided by DnStep outer shroud control cycle surpassing described downward modulation step-length sum, it is DnStep that the signal interference ratio desired value in each outer shroud control cycle is reduced step-length.

Further, also comprise the rise module, be used for judged result, be greater than or equal to described target Block Error Rate according to the data block Block Error Rate of business and raise the signal interference ratio desired value, raise step-length and be according to the output of described judge module: $\mathrm{UpStep}=\left(\frac{{\mathrm{BLER}}_{\mathrm{meas}2}-{\mathrm{BLER}}_{\mathrm{tar}}}{1-{\mathrm{BLER}}_{\mathrm{tar}}}\right)*\mathrm{SIRStepUp},$ Wherein: BLER _TarBe the block error probability desired value of business, BLER _Meas2For surpassing BLER _TarActual Block Error Rate, SIRStepUp is for set adjusting step-length.

The starting stage of embodiment of the invention downward modulation SIRtar in carrying out exterior ring power control, under the prerequisite that guarantees quality of service, adjust SIRtar with bigger downward modulation step-length, quickened the decline process of SIRtar, thereby quickened the decline of transmitting power, reduced power loss.Especially change when causing that the Eb/N0 changes in demand causes needed SIR to reduce this programme SIRtar that can descend soon when channel circumstance.

Description of drawings

Fig. 1 is closed power control basic framework figure in the cdma system;

Fig. 2, Fig. 3 are respectively the adjustment curve synoptic diagram of the embodiment of the invention;

Signal interference ratio desired value adjusting device primary structure schematic diagram during a kind of exterior ring power that Fig. 4 provides for the embodiment of the invention is controlled.

Embodiment

Owing to evenly reduce SIRtar in the SIRtar adjustment scheme that existing fast liter falls slowly, the downward modulation step-length is much smaller than raising step-length, initial SIRtar is lowered to approaches the SIRtar needs that satisfy operation quality requirement and take a long time, make system consumption bigger, if initial SIRtar is higher and channel circumstance changes, it is longer then initial SIRtar to be lowered to the time that approaches the SIRtar cost, and system power consumption is bigger.For example initial SIRtar is at 6dB, and actual convergency value is at 3dB, and then the SIRtar that falls slowly according to existing fast liter adjusts scheme, and the SIRtar decrease speed is very slow, approaches 3dB need take a long time, thereby makes system power consumption bigger.

Therefore the embodiment of the invention provides the adjustment Fang An of a kind of SIRtar of non-homogeneous adjustment, and a process that continues downward modulation SIRtar roughly is divided into three phases:

Phase I: comprise n the exterior ring power control cycle that begins to reduce SIRtar at first, n is the integer more than or equal to 1, in this stage, at least reduce SIRtar one time, all adopt bigger downward modulation step-length to adjust SIRtar each time, make SIRtar approach the SIRtar that can satisfy business demand as early as possible;

In phase I, can be at SIRtar of each exterior ring power control cycle downward modulation, then reducing total degree is n.Also can reduce a SIRtar by per two exterior ring power control cycles, can also be successively with 0,1,2,3 ... individual exterior ring power control cycle is for reducing at interval etc.

Second stage: keep through adjusted adjusted value of phase I constant;

Phase III: when waiting for and having now the adjustment curve coincidence of evenly adjusting, continue evenly to reduce SIRtar according to the definite adjustment curve of prior art.

The purpose that phase III needs the existing evenly adjustment of basis curve to reduce is to guarantee the convergence of BLER, and the convergence of BLER is meant that when overall average BLER equals BLERtar within certain period its total SIRtar adjustment amount is 0.If the data block Block Error Rate when then the last time is raised SIRtar is BLER _Meas2, raise step-length when being UpStep, what next continue to reduce

In the individual cycle, the downward modulation total amount should be UpStep, thereby makes

Total adjustment amount in cycle is 0.

Further, if $\frac{\left({\mathrm{BLER}}_{\mathrm{meas}2}\right)}{{\mathrm{BLER}}_{\mathrm{tar}}}-1<n,$ Then directly enter the phase III, adopt the even downward modulation SIRtar of DnStep.

Describe the method for adjustment of the signal interference ratio desired value that the embodiment of the invention provides below in detail:

If the data block Block Error Rate of the business in outer shroud control cycle is greater than or equal to described target Block Error Rate, then raise this professional signal interference ratio desired value, the signal interference ratio desired value raises step-length UpStep and is:

$\mathrm{UpStep}=\frac{({\mathrm{BLER}}_{\mathrm{meas}2}-{\mathrm{BLER}}_{\mathrm{tar}})}{1-{\mathrm{BLER}}_{\mathrm{tar}}}*\mathrm{SIRStepUp}$

If the data block Block Error Rate of the business in outer shroud control cycle is lower than described target Block Error Rate, then reduce this professional signal interference ratio desired value, each lasting downward modulation process roughly can be divided into three phases, is that n is that example describes with phase I downward modulation total degree below.

One, the phase I

Phase I comprises n exterior ring power control cycle, and the signal interference ratio desired value downward modulation step-length of each exterior ring power control cycle determines that method comprises:

Be lower than in the exterior ring power control cycle of target Block Error Rate at first actual Block Error Rate, determine average downward modulation step-length DnStep: $\mathrm{DnStep}=\frac{({\mathrm{BLER}}_{\mathrm{tar}}-{\mathrm{BLER}}_{\mathrm{meas}1})}{1-{\mathrm{BLER}}_{\mathrm{tar}}}*\mathrm{SIRStepUp},$ Wherein: wherein: BLER _TarBe the block error probability desired value of business, BLER _Meas1For being lower than BLER in the first exterior ring power control cycle of this stage _TarActual Block Error Rate;

According to DnStep determine the phase I in downward modulation step-length in each exterior ring power control cycle, the downward modulation step-length in each each exterior ring power control cycle is greater than described DnStep, and total downward modulation step-length sum of phase I is less than described UpStep;

Can also be after obtaining described DnStep, determine earlier described n whether less than

If then continue, otherwise determine that directly the signal interference ratio desired value downward modulation step-length of each outer shroud control cycle is this DnStep.

Illustrate the method for determining phase I downward modulation step-length according to the relation of successively decreasing below:

1, determine with the relation of index decreased, i (i=1 ..., n) adjusted value in the individual exterior ring power control cycle is k*a ⁱ* UpStep, wherein: the pass between k and a is: $\underset{i=1}{\overset{\&infin;}{\mathrm{\&Sigma;}}}k*a^i=1,$ Wherein: k and a ⁱBe respectively the setup parameter value;

2, multiply by UpStep according to the weight coefficient of setting and determine, i (i=1 ..., n) adjusted value in the individual exterior ring power control cycle is Ci*UpStep, wherein: C _iFor less than 1 weights, Ci＞Cj (i＜j), and C _iSum is less than 1;

Certainly, can also evenly reduce in the phase I, concrete grammar is:

3, in each exterior ring power control cycle of a said n exterior ring power control cycle, all press

Adjusting SIRtar descends;

According to above-mentioned constraints, those skilled in the art can also derive the various adjustment schemes that the phase I can adopt, and enumerate no longer one by one here.

Two, second stage

The exterior ring power control cycle sum that second stage comprises need be determined according to total step-length that the phase I is adjusted, for the adjustment curve that makes the phase III and existing adjustment curve when evenly adjusting overlap, the exterior ring power control cycle that phase I and second stage comprise is counted sum: the total step-length of the downward modulation of phase I is divided by DnStep, and then the exterior ring power control cycle number that comprises of second stage subtracts n for the total step-length of downward modulation after divided by DnStep;

Subtract n after divided by DnStep and equal 0 if reduce total step-length, then directly enter the phase III.

Three, the phase III

Phase III adopts DnStep evenly to reduce the signal interference ratio desired value.

In the above-mentioned non-homogeneous SIRtar downward modulation process, no matter in which in stage, be higher than the target Block Error Rate as long as receive actual Block Error Rate, then calculate and raise step-length UpStep and adjust the SIRtar rising, when receiving correct piece, begin the non-homogeneous SIRtar downward modulation that the embodiment of the invention provides.

In the reality, because BLER _TarTherefore operated by rotary motion all very little generally be just to reduce SIRtar when professional data block Block Error Rate is 0, so it is zero being lower than the data Block Error Rate of target Block Error Rate continuously general whole.

Below with specific embodiment and be described with reference to the accompanying drawings, in following examples, BLER _Tar=1%, the exterior ring power control cycle is 1 TTI, and the exterior ring power control cycle number that the phase I comprises is n, and the SIRtar downward modulation step-length of phase I two exterior ring power control cycles is with k*a ⁱ* the exponential form of UpStep descends, $\underset{i=1}{\overset{\&infin;}{\mathrm{\&Sigma;}}}k*a^i=1,$ Then:

Raising step-length each time is:

$\mathrm{UpStep}=\frac{({\mathrm{BLER}}_{\mathrm{meas}2}-{\mathrm{BLER}}_{\mathrm{tar}})}{1-{\mathrm{BLER}}_{\mathrm{tar}}}*\mathrm{SIRStepUp};$

The average step-length of adjusting is:

$\mathrm{DnStep}=\frac{({\mathrm{BLER}}_{\mathrm{tar}}-{\mathrm{BLER}}_{\mathrm{means}1})}{1-{\mathrm{BLER}}_{\mathrm{tar}}}*\mathrm{SIRStepUp};$

Wherein: SIRStepUp represents to set the adjustment step-length, is a configurable parameter.

Second stage keep that the phase I finishes the time SIRtar, the exterior ring power control cycle number that second stage comprises is:

$(\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}k*a^i)*\mathrm{UpStep}/\mathrm{DnStep}-n.$

Embodiment one (k=1, a=0.5, n=2)

Then the downward modulation step-length of SIRtar is respectively in two of the phase I exterior ring power control cycles: 0.5UpStep and 0.25UpStep, and the exterior ring power control cycle number that second stage comprises is:

Suppose, M exterior ring power control cycle received erroneous block, and the exterior ring power control cycle behind M exterior ring power control cycle has received correct piece continuously, and then the adjustment curve adjusted of the outer-loop power controlling method of present embodiment comprises following process as shown in Figure 2:

Adjusting SIRtar by rising step-length UpStep in M exterior ring power control cycle rises;

Press 0.5UpStep and adjust SIRtar decline in M+1 exterior ring power control cycle, press 0.25UpStep and adjust SIRtar decline in M+2 exterior ring power control cycle, this process is the phase I;

Do not adjust SIRtar at M+3 to M+u1+2 exterior ring power control cycle, promptly keep SIRtar constant, this process is a second stage;

After M+u1+2 and prior art adjust curve and overlap, adjust SIRtar by average downward modulation step-length DnStep in each exterior ring power control cycle and descend, this process is the phase III;

In this adjustment process, whichever exterior ring power control cycle, as long as receive erroneous block, then in receiving the exterior ring power control cycle of erroneous block, adjust the SIRtar rising by raising step-length UpStep, when receiving correct piece, begin to enter the phase I.

In the present embodiment, when first initial exterior ring power control cycle or two continuous at least exterior ring power control cycles receive erroneous block, then in above-mentioned each exterior ring power control cycle that receives erroneous block, adjust SIRtar and rise, when receiving correct piece, begin quick downward modulation by raising step-length UpStep.

The adjustment schematic diagram of consulting present embodiment SIRtar shown in Figure 2 as seen, when adopting prior art, SIRtar downward modulation curve is a straight line, SIRtar descends very slow in the downward modulation starting stage, be adjusted to 0.75dB and need u1 exterior ring power control cycle, need 2 exterior ring power control cycles and in the present embodiment SIRtar is reduced 0.75dB, much smaller than u1; Therefore adopt the non-homogeneous SIRtar decreasing method of the embodiment of the invention, make and current SIRtar can be approached the SIRtar that satisfies operation quality requirement fast, thereby make user's transmitting power can approach the minimum emissive power that satisfies operation quality requirement fast, reduced system power consumption.

Embodiment two (k=1/9, a=0.9, n=10)

Consult curve shown in Figure 3, the exterior ring power control of present embodiment specifically comprises following process:

In R exterior ring power control cycle, adjust the SIRtar rising by raising step-length UpStep;

Adjust SIRtar decline by corresponding step-length at R+1 to R+10 exterior ring power control cycle, wherein, the downward modulation step-length in R+i exterior ring power control cycle is 1/9*0.9 ⁱ* UpStep, above-mentioned i=1 ..., 10, this stage is the phase I;

Do not adjust SIRtar at R+11 to R+u2+10 exterior ring power control cycle, promptly keep SIRtar constant, this stage is a second stage;

After R+u2+10, each exterior ring power control cycle is adjusted SIRtar by average downward modulation step-length DnStep and is descended;

In this adjustment process, whichever exterior ring power control cycle receives erroneous block, then adjusts the SIRtar rising by raising step-length UpStep, begins the phase I when receiving correct piece.

As seen the adjustment schematic diagram of consulting present embodiment SIRtar shown in Figure 3 with sample value Δ 1, adopts existing algorithm to need u2 exterior ring power control cycle the SIRtar downward modulation, and only need 10 exterior ring power control cycles in the present embodiment, much smaller than u2; Therefore adopt the non-homogeneous SIRtar decreasing method of the embodiment of the invention, make and current SIRtar can be approached the SIRtar that satisfies operation quality requirement fast, thereby make user's transmitting power can approach the minimum emissive power that satisfies operation quality requirement fast, reduced system power consumption.

Parameter k, a and n get other value and determine that according to other dual mode that the invention process provides the control procedure of downward modulation step-length in the phase I is basic identical, those skilled in the art can control according to the disclosed content of the embodiment of the invention fully, enumerate no longer one by one here.

Embodiment three

After raising step-length UpStep adjustment SIRtar rising, begin a downward modulation process, in the phase I of downward modulation process, i (i=1 ..., n3) adjusted value in the individual exterior ring power control cycle is Ci*UpStep, Ci＞Cj＞0 (i＜j), and

$\mathrm{UpStep}\&GreaterEqual;\underset{i=1}{\overset{\mathrm{<figure-callout\; id="3"\; label="n"\; filenames="A20071010738500172.png,A20071010738500181.png"\; state="\{\{state\}\}">n</figure-callout>}3}{\mathrm{\&Sigma;}}}\mathrm{Ci}*\mathrm{UpStep}>\frac{\mathrm{<figure-callout\; id="3"\; label="n"\; filenames="A20071010738500172.png,A20071010738500181.png"\; state="\{\{state\}\}">n</figure-callout>}3*(\mathrm{BLERtar}-\mathrm{BLERmeas})}{1-\mathrm{BLERtar}}*\mathrm{UpStep}.$

Concrete adjustment process no longer repeat specification here.

As shown in Figure 4, the present invention also provides signal interference ratio desired value adjusting device in a kind of exterior ring power control, comprising:

Judge module 401 is used for judging each exterior ring power control cycle, professional data block Block Error Rate and the relation between the target Block Error Rate, and output judged result;

Downward modulation module 402, be used for judged result according to described judge module output, data block Block Error Rate in business is lower than in each outer shroud control cycle of target Block Error Rate continuously, at least reduce the signal interference ratio desired value one time, wherein: the downward modulation step-length sum in the n of beginning exterior ring power control cycle is less than the long UpStep of previous in fact pacing, and the signal interference ratio desired value of each outer shroud control cycle downward modulation step-length is greater than DnStep $\mathrm{DnStep}=\frac{({\mathrm{BLER}}_{\mathrm{tar}}-{\mathrm{BLER}}_{\mathrm{means}1})}{1-{\mathrm{BLER}}_{\mathrm{tar}}}*\mathrm{SIRStepUp},$ Wherein: BLER _TarBe the block error probability desired value of business, BLER _Meas1Be lower than BLER for first _TarActual Block Error Rate, n is more than or equal to 1; And continuing to reduce the signal interference ratio desired value after divided by DnStep outer shroud control cycle surpassing described downward modulation step-length sum, it is DnStep that the signal interference ratio desired value in each outer shroud control cycle is reduced step-length.

Further, for realizing the rise control of signal interference ratio desired value, signal interference ratio desired value adjusting device can also comprise:

Raise module 403, be used for judged result, be greater than or equal to described target Block Error Rate according to the data block Block Error Rate of business and raise the signal interference ratio desired value, raise step-length and be according to described judge module output: $\mathrm{UpStep}=\frac{({\mathrm{BLER}}_{\mathrm{meas}2}-{\mathrm{BLER}}_{\mathrm{tar}})}{1-{\mathrm{BLER}}_{\mathrm{tar}}}*\mathrm{SIRStepUp},$ Wherein: BLER _TarBe the block error probability desired value of business, BLER _Meas2For surpassing BLER _TarActual Block Error Rate, SIRStepUp is for set adjusting step-length.

In sum, the starting stage of embodiment of the invention downward modulation SIRtar in carrying out exterior ring power control is under the prerequisite that guarantees quality of service, adjust SIRtar with bigger downward modulation step-length, quickened the decline process of SIRtar,, reduced power loss from having quickened the decline of transmitting power.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (11)

1, a kind of method of adjustment of signal interference ratio desired value is characterized in that, is lower than downward modulation signal interference ratio desired value in each outer shroud control cycle of target Block Error Rate continuously at the data block Block Error Rate of business, wherein:

At least reduce the signal interference ratio desired value one time in n exterior ring power control cycle of beginning, wherein the downward modulation step-length sum in n cycle is less than the long UpStep of previous in fact pacing, and the signal interference ratio desired value is reduced step-length greater than DnStep each time, $\mathrm{DnStep}=\frac{({\mathrm{BLER}}_{\mathrm{tar}}-{\mathrm{BLER}}_{\mathrm{meas}1})}{1-{\mathrm{BLER}}_{\mathrm{tar}}}*\mathrm{SIRStepUp},$ Wherein: BLER _TarBe the block error probability desired value of business, BLER _Meas1Be lower than BLER for first _TarActual Block Error Rate, n is more than or equal to 1;

Continue to reduce the signal interference ratio desired value after divided by DnStep outer shroud control cycle surpassing described downward modulation step-length sum, it is DnStep that the signal interference ratio desired value in each outer shroud control cycle is reduced step-length.

2, method of adjustment as claimed in claim 1, it is characterized in that, also comprise: in the outer shroud control cycle before beginning to reduce the signal interference ratio desired value each time, be greater than or equal to described target Block Error Rate according to the data block Block Error Rate of business and raise the signal interference ratio desired value, raise step-length and be: $\mathrm{UpStep}=\frac{({\mathrm{BLER}}_{\mathrm{meas}2}-{\mathrm{BLER}}_{\mathrm{tar}})}{1-{\mathrm{BLER}}_{\mathrm{tar}}}*\mathrm{SIRStepUp},$ Wherein: BLER _TarBe the block error probability desired value of business, BLER _Meas2For surpassing BLER _TarActual Block Error Rate, SIRStepUp is for set adjusting step-length.

3, method of adjustment as claimed in claim 2 is characterized in that, also comprises:

After obtaining described DnStep, determine earlier described n whether less than

If then continue, otherwise determine that directly the signal interference ratio desired value downward modulation step-length of each outer shroud control cycle is this UpStep.

As claim 1,2 or 3 described methods of adjustment, it is characterized in that 4, the signal interference ratio desired value downward modulation total degree in described n exterior ring power control cycle is n, wherein, each exterior ring power control cycle downward modulation once.

5, method of adjustment as claimed in claim 4 is characterized in that, when described n more than or equal to 2 the time, in described n the exterior ring power control cycle, signal interference ratio desired value downward modulation step-length reduces successively.

6, method of adjustment as claimed in claim 5 is characterized in that, in described n exterior ring power control cycle, i (i=1 ..., n) individual signal interference ratio desired value downward modulation step-length is k*a ⁱ* UpStep, wherein k and a satisfy: $\underset{i=1}{\overset{\&infin;}{\mathrm{\&Sigma;}}}k*a^i=1,$ Wherein: k and a _iBe respectively the setup parameter value.

7, method of adjustment as claimed in claim 5 is characterized in that, in described n exterior ring power control cycle, i (i=1 ..., n) individual signal interference ratio desired value downward modulation step-length is C _i* UpStep, wherein: each C _iFor less than 1 weights, C _iReduce C successively _iSum is less than 1.

8, method of adjustment as claimed in claim 4 is characterized in that, in described n exterior ring power control cycle, signal interference ratio desired value downward modulation step-length each time equates.

9, method of adjustment as claimed in claim 1 is characterized in that, described exterior ring power control cycle comprises at least one Transmission Time Interval TTI.

10, signal interference ratio desired value adjusting device in a kind of exterior ring power control is characterized in that, comprising:

Judge module is used for judging each exterior ring power control cycle, the professional data block error rate and the relation between the target error rate, and output judged result;

The downward modulation module, be used for judged result according to described judge module output, data block Block Error Rate in business is lower than in each outer shroud control cycle of target Block Error Rate continuously, at least reduce the signal interference ratio desired value one time, wherein: the downward modulation step-length sum in the n of beginning exterior ring power control cycle is less than the long UpStep of previous in fact pacing, and the step-length of signal interference ratio desired value downward modulation each time is greater than DnStep $\mathrm{DnStep}=\frac{({\mathrm{BLER}}_{\mathrm{tar}}-{\mathrm{BLER}}_{\mathrm{means}1})}{1-{\mathrm{BLER}}_{\mathrm{tar}}}*\mathrm{SIRStepUp},$ Wherein: BLER _TarBe the block error probability desired value of business, BLER _Meas1Be lower than BLER for first _TarActual Block Error Rate, n is more than or equal to 1; And continuing to reduce the signal interference ratio desired value after divided by DnStep outer shroud control cycle surpassing described downward modulation step-length sum, it is DnStep that the signal interference ratio desired value in each outer shroud control cycle is reduced step-length.

11, adjusting device as claimed in claim 10 is characterized in that, also comprises:

Raise module, be used for judged result, be greater than or equal to described target Block Error Rate according to the data block Block Error Rate of business and raise the signal interference ratio desired value, raise step-length and be according to described judge module output: $\mathrm{UpStep}=\frac{({\mathrm{BLER}}_{\mathrm{meas}2}-{\mathrm{BLER}}_{\mathrm{tar}})}{1-{\mathrm{BLER}}_{\mathrm{tar}}}*\mathrm{SIRStepUp},$ Wherein: BLER _TarBe the block error probability desired value of business, BLER _Meas2For surpassing BLER _TarActual Block Error Rate, SIRStepUp is for set adjusting step-length.

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