CN1230016C - TDD CDMA system power control method and device - Google Patents
TDD CDMA system power control method and device Download PDFInfo
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- CN1230016C CN1230016C CN 03150365 CN03150365A CN1230016C CN 1230016 C CN1230016 C CN 1230016C CN 03150365 CN03150365 CN 03150365 CN 03150365 A CN03150365 A CN 03150365A CN 1230016 C CN1230016 C CN 1230016C
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/362—Aspects of the step size
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Abstract
The present invention provides a method and a device for the power control of a time division duplex code division multiple access (TDDCDMA) system, wherein the method comprises the following steps: signals transmitted by the other party are received; currently used transmitting power is obtained; a transmitting power estimation value is obtained after current up run transmitting power is weighted and smoothened; the absolute value delta=|PTX-Ppresent| of the difference of the value of the currently used transmitting power and the transmitting power estimation value after the current up run transmitting power is weighted and smoothened is calculated; the interval of the preset value of delta=|PTX-Ppresent| is judged, and step size is determined according to preset power regulation step size corresponding to the interval of delta. The device comprises a transceiver, a power-measuring device, a storage device and a controlling and calculating device. The step size of power control can be dynamically regulated along with environmental change by the present invention.
Description
Technical field
The present invention relates to CDMA mobile telecommunication, relate in particular to time-division duplex (TDD CDMA) system power control method and device.
Background technology
In code division multiple access (CDMA) system, power control mainly is in order to overcome near-far interference, to reduce system interference and power saving, this technology is on the basis that the received signal energy or the signal interference ratio index of receiver end are assessed, decline in the in good time and appropriate compensation wireless channel, thereby both kept this user's communications quality, other user in the same Radio Resource is not produced unnecessary interference again, guaranteed power system capacity.
In existing cdma system, power control is divided into forward power control and reverse power control, and its process mainly is divided into exterior ring power control, modes such as inner loop power control and open Loop Power control.The purpose of reverse power control (being called uplink power control again) is to be used for the transmitting power of control terminal, and reverse power control can be so that each terminal transmit power be the most reasonable, to save energy, prolongs end cell useful life.Forward power control (being called descending power control again) is that user terminal is controlled the transmitting power of base station (Node B) according to the measurement result of signal interference ratio (SIR).
Be that example describes with up power control mode below.Traditional uplink power control mode is by base station assisting users terminal, the transmitting power of user terminal is adjusted, thereby make terminal remain rational transmitting power.The signal interference ratio (SIR) of the reverse link traffic channel of base station after the regular hour is detected a demodulation compares with desired value (being SIRtarget) then, then sends an instruction that reduces transmitting power if measured value is higher than desired value; Otherwise, then send an instruction that increases transmitting power.After terminal receives power control command, carry out the adjustment of transmitting power according to predefined step-length.The desired value of the SIR of Traffic Channel is then adjusted according to the quality of communication link by the exterior ring power control procedure.
Yet, in above-mentioned power control is described, step-length how to determine the power adjustment is a relatively problem of difficulty, if step-length is too little, then the effect of power control is not enough to overcome the quick variation of environment, for example under the situation of degree of depth slow fading, the variation of path loss even can reach more than the 20-30dB, if and step-length is too big, then system takes place in required power not unsettled effect can occur under the situation of too big variation, thereby brings the increase of interference system in and influence the capacity of cdma system.In addition, in the middle of the process that once communicates to connect, the residing environment of user is in dynamic change, and the effect of power control all is best in the overall process that the fixing step-length of employing can not guarantee to communicate by letter.In the cdma system of existing practical application, what all adopt basically is the Poewr control method of fixed step size, and therefore, above-mentioned shortcoming is ubiquitous, and adopts adaptive variable step Poewr control method can remedy above-mentioned defective according to the environment needs.
Once some that proposed had the long power control algorithm of multistep, all were by in base station end relatively received signal sir value and sir target value, obtain their difference and thus the size of difference determine the step-length of up inner-loop power control.Such algorithm can be described with following mode:
Definition: γ=| SIR
Measure-SIR
Target|.
If 0＜γ＜δ
1 Step
New=Δ
1(such as 1dB)
δ
1＜γ＜δ
2 Step
New=Δ
2(such as 2dB)
δ
2＜γ＜δ
3 Step
New=Δ
3(such as 3dB)
If but adopt such scheme, decision-making end that the triggering step-length is adjusted and the actuating station of adjusting transmitting power is in two entities (terminal and base station) respectively, the base station not only needs transmission power control commands, but also want transmission power control step-length adjustment indication, will increase the burden of air interface and the influence that its reliability is subjected to channel circumstance like this.
In Frequency Division Duplexing (FDD) (FDD) cdma system, because different frequencies has been adopted in up-downgoing, their transmission characteristic is distinct.Therefore, the rough power in the time of only can adopting open loop control to insert as terminal initial in the FDD system is estimated, utilizes the result that downstream signal is measured in the closed power control procedure and be difficult in.
At time division duplex (TDD) CDMA, only timesharing is in time used because identical frequency transmission signal has been adopted in up-downgoing, the time interval of up-downgoing simultaneously can guarantee enough little by the design of frame structure, to guarantee in the blanking time of this section up-downgoing,, user terminal thinks that its wireless environment does not change under the situation of high-speed mobile even can being similar to.Like this, can think substantially that the up-downgoing transmission characteristic of TDD mobile communication system is consistent.Therefore, wish to utilize the power control of TDD mobile communication system can utilize up-downgoing to transmit conforming characteristic.
Summary of the invention
The objective of the invention is the shortcoming at above-mentioned prior art, a kind of time-division duplex (TDD CDMA) system power control method and device are provided, wherein the step-length of power control can dynamically be adjusted with environmental change.
The invention provides the method for a kind of time-division duplex (TDD CDMA) system power control, comprise step:
The signal parameter that is used to trigger the power control step-size adjustment is measured and obtained to the signal of recipient's receiver, transmitting emission; Obtain currently used transmitting power P
Present
According to the described signal parameter that obtains, calculating obtains the transmitting power estimated value P after the current transmit power weighting smoothly
TX
Calculate currently used transmitting power P
PresentThe absolute value delta of the difference of the transmitting power estimated value with the current transmit power weighting after level and smooth, Δ=| P
TX-Ppresent|;
Judge which predetermined interval is described Δ value be in, and adjust the adjustment step-length that step value is determined power according to the pairing predetermined power of the residing predetermined interval of described Δ;
Described predetermined interval is the predefined condition that is used to trigger power adjustment step-length in the system, is the represented interval of interval of values to set.
Alternatively, the described Δ of described judgement=| P
TXWhich predetermined interval is the value of-Ppresent| be in, and adjusts step-length according to the residing interval corresponding predetermined power of described Δ and determine that the step of step-length comprises:
Judge described Δ=| P
TXWhether the value of-Ppresent| is greater than the first predetermined threshold (δ
1), less than the second predetermined threshold (δ
2);
If described Δ is greater than the first predetermined threshold (δ
1), power is adjusted step-length promote a step-length grade;
If described Δ is less than the second predetermined threshold (δ
2), power is adjusted step-length reduce a step-length grade;
If described Δ is at the first predetermined threshold (δ
1) and the second predetermined threshold (δ
2) between, uncomfortable synchronizing is long;
Wherein, described δ
1〉=described δ
2
Preferably, method also comprises step: extract the TPC order that described the other side sends, whether decision should carry out the power adjustment, adjusts if desired, adjusts power according to described definite step-length, then, transmits signals to described the other side by wireless channel.
Alternatively, method also comprises step:
Every the signal interference ratio (SIR) of preset time detection reverse link traffic channel,
More described signal interference ratio and predetermined target value;
If described signal interference ratio is higher than described desired value and then reduces transmitting power;
Otherwise, then increase transmitting power.
Preferably, wherein, the transmitting power estimated value P after the current uplink transmission power weighting of described acquisition is level and smooth
TXStep comprise:
According to the signal of the other side of described reception emission, obtain the open loop of Traffic Channel and estimate transmitting power;
Take out the last transmission power level (P that estimates
TX_last);
Utilize predetermined smoothing factor, obtain the transmitting power estimated value (P of current uplink transmission power weighting after level and smooth
TX).
Alternatively, described open loop of obtaining Traffic Channel estimates that the step of transmitting power comprises:
Received power (the PRX that signal fadeout on the acquisition beacon channel and Traffic Channel expectation obtain
PDPCHdes);
Wherein, the received power (PRX of described expectation acquisition
PDPCHdes) satisfy following formula:
(SIR)
DPCHRepresent the reception signal interference ratio that expectation obtains on the used channel;
I
PDPCHRepresent the interference power on the used channel.
Preferably, the interference power on the described used channel obtains through the following steps: described the other side measures interference power, by system message broadcasting, to obtain the last interference power.
Alternatively, the transmitting power estimated value (P after the current uplink transmission power weighting of described acquisition smoothly
TX) satisfy following formula:
P
TX＝αP
DPCH+(1-α)P
TX_last (1)
Wherein, P
TX_lastIt is the last transmission power level of estimating; α is a smoothing factor; P
DPCHTransmitting power is estimated in the open loop of expression Traffic Channel, satisfies formula (2)
P
DPCH＝PRX
PDPCHdes+P
Loss
Wherein, P
LossFor measuring the signal fadeout on the beacon channel;
PRX
PDPCHdesRepresent the received power that expectation obtains on this channel.
Preferably, method also comprises step,
According to the signal of the other side of described reception emission, obtain the path loss of current estimation;
The path loss that predetermined time is estimated before reading;
Judge described current estimation path loss and described before the difference of the path loss estimated for predetermined time be positioned at that interval in predetermined a plurality of intervals;
According to that interval of described judgement and/or according to the residing interval of described Δ, determine power adjustment step-length.
Alternatively, described according to that interval of described judgement and/or according to the residing interval of described Δ, determine that the step of power adjustment step-length comprises:
If described Δ greater than first predetermined threshold, promotes a step-length grade if perhaps described γ, then adjusts power step-length greater than the 3rd predetermined threshold;
If if described Δ is not more than the 3rd predetermined threshold less than second predetermined threshold and described γ, then power is adjusted step-length and reduced a step-length grade;
If do not satisfy above-mentioned two conditions, do not change power and adjust step-length.
The present invention also provides the device of a kind of time-division duplex (TDD CDMA) system power control, comprising:
Transceiver is used to receive the signal of the other side's emission, transmits with the parameter of obtaining signal with to the other side;
Power-measuring device obtains currently used transmitting power (Ppresent);
Storage device is used to store currently used transmission power level (Ppresent) and former transmission power level;
Control and calculation element according to the signal of the other side of described reception emission, obtain the transmitting power estimated value (P of current uplink transmission power weighting after level and smooth
TX); Calculate the absolute value of the difference of currently used transmitting power (Ppresent) and the current uplink transmission power weighting transmitting power estimated value after level and smooth, Δ=| P
TX-Ppresent|;
Judgment means, be used to judge described Δ=| P
TXThe value of-Ppresent| is in that predetermined interval;
Wherein, described control is determined step-length with calculation element according to the corresponding predetermined power adjustment step-length in the residing interval of described Δ.
Alternatively, described control and calculation element also comprise the loss deriving means, are used for the signal according to the other side's emission of described reception, obtain the path loss of current estimation;
The path loss that predetermined time was estimated before described storage device also stored;
Described control and calculation element also comprise loss deviation judgment means, be used to judge described current estimation path loss and described before the difference of the path loss estimated for predetermined time be positioned at that interval in predetermined a plurality of intervals;
Wherein, described control and calculation element are determined power adjustment step-length according to that interval of described judgement and/or according to the residing interval of described Δ.
Utilize the present invention, the step-length that power is adjusted can adapt to and dynamic change with environment facies.Can realize that also the adjustment of terminal (or base station) transmitting power depends on the combination of up (or descending) closed power control step-length and corresponding power control command.
Description of drawings
Fig. 1 shows the flow chart of the Poewr control method that the open loop of first preferred embodiment of the present invention combines with closed loop and the block diagram of realization;
Fig. 2 shows the flow chart of the Poewr control method that the open loop of second preferred embodiment of the present invention combines with closed loop and the block diagram of realization, wherein, has increased auxiliary step-length adjustment;
Fig. 3 shows the flow chart of the Poewr control method that the open loop of the 3rd preferred embodiment of the present invention combines with closed loop and the block diagram of realization, wherein, has increased the measurement parameter classification is handled.
Embodiment
In time division duplex (TDD) cdma system, only timesharing is in time used because identical frequency transmission signal has been adopted in up-downgoing, the time interval of up-downgoing simultaneously can guarantee enough little by the design of frame structure, to guarantee in the blanking time of this section up-downgoing,, user terminal thinks that its wireless environment does not change under the situation of high-speed mobile even can being similar to.Like this, can think substantially that the up-downgoing transmission characteristic of TDD mobile communication system is consistent.Under this prerequisite, the transmitting power that can adopt the method estimating user terminal of open Loop Power control to adopt, and compare, and then the foundation of adjusting as closed power control step-length with this difference with the actual emission power of current time.Network only needs regularly the measured value of ascending time slot interference to be broadcasted in the sub-district to get final product.When this algorithm realizes carrying out the uplink power control step-length when adjusting in terminal, the adjustment of power control step-size is realized in user terminal fully, avoided the signaling consumption on the air interface required when network terminal is adjusted, have very high realizability.(algorithm has directly utilized the foundation that the estimated value of path loss is adjusted as power control step-size simultaneously, realizes directly perceived, effective.) if the base station end need understand the power control step-size that terminal is used, terminal can send to the base station end with the step value of current use by up signaling.
Interfere information in the path loss values that if this algorithm when the adjustment of base station end realization carrying out descending power control step-length, needs terminal periodic to report to measure down-bound pilot frequency signal and the time slot of downstream signal.
In cdma system, the closed power control procedure is necessary, and it can make terminal (or base station) satisfy relevant channel quality requirement with as far as possible little power.Closed power control finally reaches the balance of signal interference ratio SIR usually by the reciprocal process of base station and terminal room with certain adjustment step-length.In the design of cdma system, down direction generally all has beacon channel, and the transmitting power of this beacon channel is broadcasted in whole cell range by system message, reference when going open Loop Power control on the implementation for UE (subscriber equipment).In the standardized TD-SCDMA of 3GPP (3G (Third Generation) Moblie normal structure) system, used this special time slot of descending pilot frequency (DwPTS) or Primary Common Control Physical Channel (PCCPCH) especially as the beacon channel purpose.Because identical frequency has been used in the up-downgoing of TDD system, therefore the open Loop Power control of system can be done very accurately at single UE, yet, directly use open Loop Power control and can often cause the amplitude of transmitting power adjustment excessive, and make the stability decreases of whole system.Therefore, in the power control of up (or descending) link, can utilize the principle of open Loop Power control, in conjunction with estimating the transmitting power that up (descending) signal should have with the current time slots interfere information in the down-bound pilot frequency signal of known its transmitting power, and adjust the step-length of closed power control according to this information self-adapting ground, stablize and transmitting power adjustment accurately, thereby reach the power control effect of optimization.
Being applied to uplink power control with the present invention below is example, and the algorithm in the invention is described.This algorithm can be applied to the base station end equally.Making characteristics when carrying out uplink power control in this way is that the step-length of terminal power adjustment is divided at least 2 or 2 above grades (in an embodiment of the present invention, be divided into 5 grades, be respectively 0.5dB, 0.8dB, 1dB, 1.2dB, 1.5dB), utilization is measured the adjustment that the information that obtains triggers closed power control step-length to downstream signal, and the execution of the decision-making of step-length adjustment and transmitting power adjustment is all finished in terminal.
According to the principle of open Loop Power control, terminal is weighted current open loop transmit power estimated value and last open loop transmit power estimated value smoothly, needing to obtain emitted power value P
TXWith P
TXTransmission power level P with current terminal
PresentMake comparisons, obtain the absolute value delta of difference power=| P
TX-Ppresent|.Simultaneously, terminal utilizes pilot signal to calculate received signal path loss P
Loss, and the mean value of the estimated value of the together nearest inferior path loss of M (M is 2 in an embodiment of the present invention)
Compare, remember that the absolute value of both differences is
Describe 3 kinds of embodiments of this self adaptation variable step power control algorithm below respectively with reference to the accompanying drawings:
Fig. 1 shows the flow chart of the Poewr control method that the open loop of first preferred embodiment of the present invention combines with closed loop and the block diagram of realization.
At first, terminal 100 (UE) receives the signal of base station 105 by downlink wireless channel 110 emissions, obtains the parameter of signal; And the currently used transmitting power Ppresent of acquisition terminal 100;
In step 120, estimate the transmitting power estimated value P of current uplink transmission power weighting after level and smooth
TX:
P
TX＝αP
DPCH+(1-α)P
TX_last (1)
P wherein
TXBe the transmitting power estimated value after level and smooth to current uplink transmission power weighting;
P
TX_lastBe the last transmitting power P that estimates
TXValue; α is a smoothing factor;
P
DPCHTransmitting power is estimated in the open loop of expression Traffic Channel, can calculate with reference to formula (2)
P
DPCH＝PRX
PDPCHdes+P
loss (2)
Wherein,
P
LossFor measuring the signal fadeout on the beacon channel; In the TD-SCDMA mobile communication system, used this special time slot of descending pilot frequency (DwPTS) or Primary Common Control Physical Channel (PCCPCH) especially as the beacon channel purpose.
PRX
PDPCHdesRepresent the received power that expectation obtains on this channel, can calculate with reference to formula (3)
(SIR)
DPCHRepresent the reception signal interference ratio that expectation obtains on this channel;
I
PDPCHRepresent the interference power on this channel, measure and in cell range, broadcast that user terminal 100 (UE) is as the criterion with the updating value of the last interference power by system message by base station 105.
In step 125, the absolute value of the difference of the transmitting power estimated value after the currently used transmitting power Ppresent of computing terminal 100 and current uplink transmission power weighting are level and smooth, Δ=| P
TX-Ppresent|;
In step 130, the judgement Δ=| P
TXWhether-Ppresent| is greater than the first predetermined threshold δ
1, less than the second predetermined threshold δ
2
If this Δ is greater than the first predetermined threshold δ
1(in an embodiment of the present invention, its scope is 1～1.5dB), and this explanation current transmit power differs bigger with the transmitting power of being estimated by open Loop Power control that needs, and then in step 135 power of terminal is adjusted step-length and promotes a step-length grade;
If this Δ is less than the second predetermined threshold δ
2(in an embodiment of the present invention, its scope is 0.2～0.5dB), and this explanation current transmit power differs less with the transmitting power of being estimated by open Loop Power control that needs, and then in step 135 power of terminal is adjusted step-length and reduces a step-length grade.
If this Δ is at the first predetermined threshold δ
1With the second predetermined threshold δ
2Between, this explanation current transmit power is adjusted step-length with the power of being estimated by open Loop Power control that needs transmitting power to differ suitable terminal, and is then long in the uncomfortable synchronizing of step 135.
In actual applications, these 2 conditions that trigger the step-length adjustment are adjudicated according to its number order.Here, difference power threshold delta
1〉=δ
2
In step 145, terminal 100 is extracted TPC (Transmit power control, through-put power control) order, whether decision should carry out the power adjustment, adjust if desired,, adjust power according to the step-length of determining in step 135 in step 140, then, transmit signals to base station (Node B) 105 by uplink wireless channel 115.
The power control step-size that terminal adopts sends to base station end with this step value by up signaling through after adjusting.In the process of uplink power control, base station and terminal are still carried out according to present standard.The terminal SIR (signal interference ratio) that the base station receives with the Frequency Estimation of the highest 200Hz, and with target SIR relatively.When measured SIR during greater than target SIR, in back to back next 5ms subframe, send the instruction of TPC=-1 to terminal, command terminal reduces transmitting power, when measured SIR during less than target SIR, then send the instruction of TPC=1 in back to back next 5ms subframe to terminal, command terminal improves transmitting power.Terminal is carried out the adjustment of transmitting power according to the up-to-date step-length of determining of once calculating of the method for patent of the present invention after receiving the TPC order.In order to make terminal can estimate that it answers emitted power, the measurement of ascending time slot ISCP also must periodically be carried out in the base station, and periodically broadcasts in the sub-district by system message.The terminal that is in connection mode is the monitoring system broadcast simultaneously, when receiving ascending time slot ISCP (Interference signalcode power, interference signal code check) parameter, correspondingly will upgrade inner save value.
When this scheme of use is carried out emulation, under identical services intensity situation, relatively, can reduce cutting off rate (1%) with fixed step size algorithm (step-length adopts 1dB).Here the call drop criterion of Cai Yonging is: received signal signal interference ratio sir value is lower than target SIR value 140ms continuously, then judges this terminal call drop.
Fig. 2 shows the flow chart of the Poewr control method that the open loop of second preferred embodiment of the present invention combines with closed loop and the block diagram of realization, wherein, has increased auxiliary step-length adjustment.Succinct for what describe, the part identical with Fig. 1 do not described in detail here, the main here description part different with Fig. 1.
At first, terminal 100 (UE) receives the signal of base station 105 by downlink wireless channel 110 emissions, obtains the parameter of signal; And the currently used transmitting power Ppresent of acquisition terminal 100; And the beacon channel signal, to utilize beacon channel calculated signals received signal path loss P
Loss
In step 120, estimate the transmitting power estimated value P of current uplink transmission power weighting after level and smooth
TX
Step 205 is steps that auxiliary step-length is adjusted, and wherein, in step 210, obtains the mean value of the estimated value of the inferior path loss of nearest two (can be more times)
Wherein, P
iBe i time path loss measured value before this.
In step 130, the judgement Δ=| P
TXWhether-Ppresent| is greater than the first predetermined threshold δ
1, less than the second predetermined threshold δ
2With
In step 220 and 225, calculate and judgement
Whether greater than the 3rd predetermined threshold δ
3
If this Δ is greater than the first predetermined threshold δ
1(in an embodiment of the present invention, its scope is 0.5～1dB), and this explanation current transmit power differs bigger with the transmitting power of being estimated by open Loop Power control that needs, and perhaps γ is greater than the 3rd predetermined threshold δ
3(in an embodiment of the present invention, its scope is 0.5～1dB) (illustrating that bigger variation takes place channel circumstance), then in step 135 power of terminal is adjusted step-length and promotes a step-length grade;
If this Δ is less than the second predetermined threshold δ
2(in an embodiment of the present invention, its scope is 0.2～0.5dB), and this explanation current transmit power differs less with the transmitting power of being estimated by open Loop Power control that needs, and γ is not more than the 3rd predetermined threshold δ
3(in an embodiment of the present invention, its scope is 0.5～1dB) (illustrating that bigger variation does not take place channel circumstance), then in step 135 power of terminal is adjusted step-length and reduces a step-length grade.
If this Δ is at the first predetermined threshold δ
1With the second predetermined threshold δ
2Between, this explanation current transmit power is adjusted step-length with the power of being estimated by open Loop Power control that needs transmitting power to differ suitable terminal, and γ is not more than the 3rd predetermined threshold δ
3(in an embodiment of the present invention, its scope is 0.5～1dB) (illustrating that bigger variation does not take place channel circumstance), and is then long in the uncomfortable synchronizing of step 135.
In actual applications, these 2 conditions that trigger the step-length adjustment are adjudicated according to its number order.Here, difference power threshold delta
1〉=δ
2
In step 145, terminal 100 is extracted the TPC order, and whether decision should carry out the power adjustment, adjusts if desired, in step 140, adjusts power according to the step-length of determining in step 135, then, transmits signals to base station (Node B) 105 by uplink wireless channel 115.
The power control step-size that terminal adopts sends to base station end with this step value by up signaling through after adjusting.In the process of uplink power control, base station and terminal are still carried out according to present standard.The terminal SIR that the base station receives with the Frequency Estimation of the highest 200Hz, and with target SIR relatively.When measured SIR during greater than target SIR, in back to back next 5ms subframe, send the instruction of TPC=-1 to terminal, command terminal reduces transmitting power, when measured SIR during less than target SIR, then send the instruction of TPC=1 in back to back next 5ms subframe to terminal, command terminal improves transmitting power.Terminal is carried out the adjustment of transmitting power according to the up-to-date step-length of determining of once calculating of the method for patent of the present invention after receiving the TPC order.In order to make terminal can estimate that it answers emitted power, the measurement of ascending time slot ISCP also must periodically be carried out in the base station, and periodically broadcasts in the sub-district by system message.The terminal that is in connection mode is the monitoring system broadcast simultaneously, when receiving ascending time slot ISCP parameter, correspondingly will upgrade inner save value.
Fig. 3 shows the flow chart of the Poewr control method that the open loop of the 3rd preferred embodiment of the present invention combines with closed loop and the block diagram of realization, wherein, has increased the measurement parameter classification is handled.Succinct for what describe, the part identical with Fig. 1 and 2 do not described in detail here, the main here description part different with Fig. 1 and 2.
In this embodiment, with the measurement parameter Δ, the γ classification is handled.Δ is divided into a plurality of intervals; And there is one-to-one relationship (to be 3 intervals among the embodiment, to be respectively: σ between each interval and the step-length grade
1=[0dB, 2dB); σ
2=[2dB, 6dB); σ
3=[6dB, ∞).Interval corresponding reference step-length is respectively: 0.5dB, 1dB, 1.5dB).γ is divided into a plurality of intervals; And there is one-to-one relationship (to be 3 intervals among the embodiment, to be respectively: α between each interval and the step-length grade
1=[0dB, 2dB); α
2=[2dB, 6dB); α
3=[6dB, ∞).Interval corresponding reference step-length is respectively: 0.5dB, 1dB, 1.5dB).
If judge that in step 315 Δ is at a certain interval σ
nIn, then select corresponding power to adjust step delta P1;
If judge that in step 310 γ is at a certain interval α
nIn, then select corresponding power to adjust step delta P2;
Then, in step 320, the step-length of selecting Δ P=max (Δ P1, Δ P2) to adjust as actual power.
The power control step-size that terminal adopts sends to base station end with this step value by up signaling through after adjusting.In the process of uplink power control, base station and terminal are still carried out according to present standard.The terminal SIR that the base station receives with the Frequency Estimation of the highest 200Hz, and with target SIR relatively.When measured SIR during greater than target SIR, in back to back next 5ms subframe, send the instruction of TPC=-1 to terminal, command terminal reduces transmitting power, when measured SIR during less than target SIR, then send the instruction of TPC=1 in back to back next 5ms subframe to terminal, command terminal improves transmitting power.Terminal is carried out the adjustment of transmitting power according to the up-to-date step-length of determining of once calculating of the method for patent of the present invention after receiving the TPC order.In order to make terminal can estimate that it answers emitted power, the measurement of ascending time slot ISCP also must periodically be carried out in the base station, and periodically broadcasts in the sub-district by system message.The terminal that is in connection mode is the monitoring system broadcast simultaneously, when receiving ascending time slot ISCP parameter, correspondingly will upgrade inner save value.
When this scheme of use is carried out emulation, under identical services intensity situation, relatively, can reduce cutting off rate (1%) with fixed step size algorithm (step-length adopts 1dB).Here the call drop criterion of Cai Yonging is: received signal signal interference ratio sir value is lower than target SIR value 140ms continuously, then judges this terminal call drop.
Though in an embodiment, described the control of use TPC order carrying out power, in fact, the present invention also can carry out power control without the TPC order.
Among the present invention, the device of a kind of time-division duplex (TDD CDMA) system power control comprises:
Transceiver is used to receive the signal of the other side's emission, transmits with the parameter of obtaining signal with to the other side;
Power-measuring device obtains currently used transmitting power Ppresent;
Storage device is used to store currently used transmission power level Ppresent and former transmission power level;
Control and calculation element according to the signal of the other side of described reception emission, obtain the transmitting power estimated value P of current uplink transmission power weighting after level and smooth
TXCalculate the absolute value of the difference of currently used transmitting power Ppresent and the current uplink transmission power weighting transmitting power estimated value after level and smooth, Δ=| P
TX-Ppresent|;
Judgment means, be used to judge described Δ=| P
TXThe value of-Ppresent| is in that predetermined interval;
Wherein, described control is determined step-length with calculation element according to the corresponding predetermined power adjustment step-length in the residing interval of described Δ;
Wherein, described control and calculation element also comprise the loss deriving means, are used for the signal according to the other side's emission of described reception, obtain the path loss of current estimation;
The path loss that predetermined time was estimated before described storage device also stored;
Described control and calculation element also comprise loss deviation judgment means, be used to judge described current estimation path loss and described before the difference of the path loss estimated for predetermined time be positioned at that interval in predetermined a plurality of intervals;
Wherein, described control and calculation element are determined power adjustment step-length according to that interval of described judgement and/or according to the residing interval of described Δ.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (12)
1. the method for TDD-CDMA system power control comprises step:
The signal parameter that is used to trigger the power control step-size adjustment is measured and obtained to the signal of recipient's receiver, transmitting emission; Obtain currently used transmitting power P
Present
According to the described signal parameter that obtains, calculating obtains the transmitting power estimated value P after the current uplink transmission power weighting smoothly
TX
Calculate currently used transmitting power P
PresentThe absolute value delta of the difference of the transmitting power estimated value with current uplink transmission power weighting after level and smooth, Δ=| P
TX-Ppresent|;
Judge which predetermined interval is described Δ value be in, and adjust the adjustment step-length that step value is determined power according to the pairing predetermined power of the residing predetermined interval of described Δ;
Described predetermined interval is the predefined condition that is used to trigger power adjustment step-length in the system, is the represented interval of interval of values to set.
2. the method for claim 1, wherein adjust step value and determine that the step of the adjustment step-length of power specifically comprises according to the pairing predetermined power of the residing predetermined interval of described Δ:
Whether the value of judging described Δ is greater than the first predetermined threshold δ
1, less than the second predetermined threshold δ
2, δ
1〉=δ
2
If described Δ is greater than δ
1, power is adjusted step-length promotes a step-length grade;
If described Δ is less than δ
2, power is adjusted step-length reduces a step-length grade;
If described Δ is at δ
1And δ
2Between, uncomfortable synchronizing is long.
3. the method for claim 1 also comprises step: extract the transmission power control command TPC that described emission side sends, determine whether should carry out the power adjustment, adjust if desired, adjust power according to described definite step-length, then, transmit signals to described emission side by wireless channel.
4. as the described method of one of claim 1 to 3, also comprise step:
Every the signal interference ratio SIR of preset time detection reverse link traffic channel,
More described signal interference ratio and predetermined target value;
If described signal interference ratio is higher than described desired value and then reduces transmitting power;
Otherwise, then increase transmitting power.
5. the method for claim 1, wherein described calculating obtains the transmitting power estimated value P after the current uplink transmission power weighting smoothly
TXStep comprise:
According to the signal of the emission side of described reception emission, calculate the open loop of obtaining Traffic Channel and estimate transmitting power P
DPCH
Take out the last transmission power level P that estimates
TX_last
Utilize predetermined smoothing factor α, by the transmitting power estimated value P after the following formula calculating acquisition current uplink transmission power weighting smoothly
TX
P
TX＝αP
DPCH+(1-α)P
TX_last
6. method as claimed in claim 5 wherein, is obtained the open loop of Traffic Channel and is estimated transmitting power P in described calculating
DPCHStep in also comprise the received power PRX that computing service channel expectation obtains
PDPCHdesStep:
The received power PRX that this expectation obtains
PDPCHdesSatisfy following formula:
Wherein, (SIR)
DPCHRepresent the reception signal interference ratio that expectation obtains on the used channel; I
PDPCHRepresent the interference power on the used channel.
7. method as claimed in claim 6, wherein, the interference power on the described used channel obtains through the following steps:
Interference power is measured by described emission side, and broadcasts in the sub-district by system message;
Described recipient obtains the last interference power.
8. method as claimed in claim 6, wherein, described calculating is obtained the open loop of Traffic Channel and is estimated transmitting power P
DPCHStep comprise:
Measure the signal fadeout P on the beacon channel
Loss
Calculate open loop according to following formula and estimate transmitting power P
DPCH
P
DPCH＝PRX
PDPCHdes+P
Loss
9. method as claimed in claim 1 or 2, further comprising the steps of:
From described signal parameter, extract the path loss P that obtains current estimation
Loss
Calculate the mean value of presetting the estimated value of inferior path loss in the past according to following formula
Wherein, P
iBe i time path loss measured value before this.
Calculate described P
LossWith described
The absolute value γ of difference, judge that described γ is arranged in that described predetermined interval;
According to the residing predetermined interval of described γ and/or according to the residing predetermined interval of described Δ, determine power adjustment step-length.
10. method as claimed in claim 9, wherein described according to the residing predetermined interval of described γ and/or according to the residing predetermined interval of described Δ, determine that the step of power adjustment step-length comprises:
If described Δ greater than first predetermined threshold, promotes a step-length grade if perhaps described γ, then adjusts power step-length greater than the 3rd predetermined threshold;
If if described Δ is not more than the 3rd predetermined threshold less than second predetermined threshold and described γ, then power is adjusted step-length and reduced a step-length grade;
If do not satisfy above-mentioned two conditions, do not change power and adjust step-length.
11. the device of a TDD-CDMA system power control comprises:
Transceiver is used to receive the signal of the other side's emission, transmits with the parameter of obtaining signal with to the other side;
Power-measuring device obtains currently used transmitting power Ppresent;
Storage device is used to store currently used transmission power level Ppresent and former transmission power level;
Control and calculation element according to the signal of the other side of described reception emission, obtain the transmitting power estimated value P of current uplink transmission power weighting after level and smooth
TXCalculate the absolute value delta of the difference of currently used transmitting power Ppresent and the current uplink transmission power weighting transmitting power estimated value after level and smooth, Δ=| P
TX-Ppresenn|;
Judgment means is used to judge that described Δ is in that described predetermined interval;
Wherein, described control and calculation element are adjusted the adjustment step-length that step value is determined power according to the pairing predetermined power of the residing predetermined interval of described Δ.
12. device as claimed in claim 11, wherein,
Described control and calculation element also comprise the loss deriving means, are used for the signal according to emission side's emission of described reception, obtain the path loss of current estimation;
The path loss that predetermined time was estimated before described storage device also stored;
Described control and calculation element also comprise loss deviation judgment means, be used for judging described current estimation path loss and described before default time the absolute value of difference of mean value of estimated value of path loss to be positioned at that of predetermined interval interval and according to judged result and/or according to the residing interval of described Δ, determine that power adjusts step-length.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03150365 CN1230016C (en) | 2003-07-25 | 2003-07-25 | TDD CDMA system power control method and device |
| PCT/CN2004/000867 WO2005011143A1 (en) | 2003-07-25 | 2004-07-26 | A power control method and apparatus for time division duplex code division multiple access system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03150365 CN1230016C (en) | 2003-07-25 | 2003-07-25 | TDD CDMA system power control method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1479541A CN1479541A (en) | 2004-03-03 |
| CN1230016C true CN1230016C (en) | 2005-11-30 |
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ID=32001962
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03150365 Expired - Lifetime CN1230016C (en) | 2003-07-25 | 2003-07-25 | TDD CDMA system power control method and device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1230016C (en) |
| WO (1) | WO2005011143A1 (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100386973C (en) * | 2004-12-23 | 2008-05-07 | 华为技术有限公司 | Method of automatic gain correction for down going channel |
| CN100373806C (en) * | 2005-11-02 | 2008-03-05 | 中兴通讯股份有限公司 | High speed shared control channels and method for realizing high speed shared information channel power |
| CN101384069B (en) * | 2007-09-05 | 2011-12-14 | 电信科学技术研究院 | Power control parameter configuring method and related apparatus |
| CN101459956B (en) * | 2007-12-10 | 2012-01-11 | 电信科学技术研究院 | Load control method and apparatus |
| CN101981822B (en) * | 2008-03-27 | 2014-05-14 | 艾利森电话股份有限公司 | Uplink power control method and device in TDD communication system |
| CN101877905B (en) * | 2009-04-28 | 2012-08-29 | 电信科学技术研究院 | Method and device for controlling power of downlink control channel |
| CN101990230A (en) * | 2009-07-30 | 2011-03-23 | 大唐移动通信设备有限公司 | Method and equipment for measuring wireless network communication system |
| CN102300302A (en) * | 2010-06-24 | 2011-12-28 | 中兴通讯股份有限公司 | Method and device for controlling joint power |
| CN101909351A (en) * | 2010-07-20 | 2010-12-08 | 北京邮电大学 | Method for setting power control step length based on path loss model estimation |
| CN104754717B (en) * | 2013-12-26 | 2019-02-05 | 华为技术有限公司 | A kind of Poewr control method and user equipment |
| CN104640190B (en) * | 2015-02-04 | 2018-05-08 | 惠州Tcl移动通信有限公司 | A kind of method and system of mobile terminal radio frequency transmission power control |
| CN110267336A (en) * | 2019-05-14 | 2019-09-20 | 惠州Tcl移动通信有限公司 | Antenna transmission power control method, mobile terminal and storage medium |
| CN113498154A (en) | 2020-04-06 | 2021-10-12 | 瑞昱半导体股份有限公司 | Method for WiFi module and related system |
| CN115883716A (en) * | 2021-09-28 | 2023-03-31 | 中国移动通信集团设计院有限公司 | Terminal control method, device and equipment |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1115813C (en) * | 1999-11-12 | 2003-07-23 | 深圳市中兴通讯股份有限公司 | Method for controlling baseband gain treatment by using WCDMA closed-loop power |
| JP3360053B2 (en) * | 1999-11-19 | 2002-12-24 | 埼玉日本電気株式会社 | Mobile communication terminal |
| KR100434042B1 (en) * | 2001-05-19 | 2004-06-04 | 엘지전자 주식회사 | Closed loop power control method for code division multiple access |
-
2003
- 2003-07-25 CN CN 03150365 patent/CN1230016C/en not_active Expired - Lifetime
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| CN1479541A (en) | 2004-03-03 |
| WO2005011143A1 (en) | 2005-02-03 |
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