CN1681220A - Up-link power controlling method of mobile terminal by time division-CDMA mode - Google Patents
Up-link power controlling method of mobile terminal by time division-CDMA mode Download PDFInfo
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Abstract
For each up stream time slot n and each transmitting format combination j, the maximum weight value in all possible combination of Yn,j,i and Bj in the time slot is obtained. Yn,j,i is weighting factor of number n slot time corresponded by number j code channel at number j kind transmitting format combination. According to input range of full range of DAC, amplifies the Bj to Bn,j, to make utmost numeric area of DAC approach to full range of DAC. Bn,j presents number n up stream time slot, and number j TFC weighting factor. For each up stream time slot, the independent and initial simulation weighting gain factor is allocated to terminal in order to make each time slot transmitting power meet the requirement of network.
Description
Technical field
The present invention relates to a kind of portable terminal ascending power control method, especially a kind ofly be applied to a kind of ascending power control method that uses the portable terminal of time-division and code division multiple access mode simultaneously, belong to mobile communication
Technical field.
Background technology
Adopt the mobile communication system of time division multiple access and code division multiple access at the same time, in TD-SCDMA (TD SDMA) system, because to different time-gap interference level and interference variations level and unbalanced, its uplink closed loop is taked timeslot-based mode, and promptly the transmitting power of the different ascending time slots of control terminal is respectively come by the different TPC of down link (purpose of closed loop transmit power control) control command in the base station.
The weighting of terminal uplink transmission power can be divided into numerical weighted and analog weighted two large divisions.Numerical weighted is the signal to noise ratio for signal between the different code channels of equilibrium on the one hand; Be the size of controlling power output according to data traffic on the other hand, prevent the variation of the base station receiving terminal signal to noise ratio that factor brings according to changes in flow rate.
The basic process of numerical weighted is as shown in Figure 1: behind identical specified power Power Setting, each have different weighted factor γ for different uplink special physical channel (ULDPCH)
i, γ
iValue by spreading factor SF decision, shown in the table specific as follows:
β among Fig. 1
jBe that the signal after the different code channel merging is unified weighting, described β
jPromptly corresponding to the TFC (transformat combination) of current use, j TFC just.
Analog weighted is to gain by the power amplifier of control in the analog circuit to realize control to the terminal power output; Power in the initial power of special uplink channel and the closed power control procedure all is subjected to analog weighted influence.
For the consideration that realizes simplicity, the uplink closed loop of terminal generally is to be undertaken by the mode of the analog weighted factor of direct change, and can not carry out uplink closed loop by the mode that changes the numerical weighted factor usually.
Numerical weighted and the analog weighted common real output that determines terminal.In order to guarantee that terminal can reach its peak power output, require after the numerical weighted signal through DAC to reach or near the full scale of DAC device.When this just requires the configurable number word weighted gain factor, make at all possible γ
iAnd β
jThe maximum weighted value can make digital signal after the weighting reach or near the full scale input of DAC device in the combination, and regulates β with this principle
jValue.
With the said method equivalence be, seek a gain factor g, make at all possible γ
iWith g β
jThe maximum weighted value can make range digital after the weighting reach or near the full scale of DAC device in the combination.
Terminal is independently controlled the transmitting power of up each time slot by the mode of closed power control in communication maintenance process, this process realizes that by analog weighted the power amplifier that promptly changes each time slot gains and regulates the power of each time slot.
The power control mode of prior art is described below by a concrete example.
If terminal has been assigned with TS1 and has done ascending time slot, having distributed a spreading factor on the TS1 is 1 code channel, and the spreading factor of then giving TS1 is the weighted factor γ of 1 code channel
1=1; If up TFC has two: β
1=1/2, β
2=3/2; If the complex signal real part before every code channel spread spectrum and the span of imaginary part all are [1,1]; Suppose digital FIR filter to the peak value of digital signal without any influence; If the DAC of real part and imaginary part input is 8 bits.
Owing to have only a code channel, in theory terminal to the handling process of data as shown in Figure 2 because γ
iAnd β
jThe combination maximum be 3/2, and the full scale input reference signal of DAC is [127,127], therefore in actual weighted, should be β
jAmplify a rational multiple, make the span of the digital signal enter into DAC near the full scale [127,127] of DAC.Such as with β
jBe amplified to original 80 times, i.e. β
1=40, β
2=120, the actual input range of DAC can reach [120,120] like this, and the peak power of the output analog signal of DAC can be near maximum at this moment.Like this when power amplifier gain factor p reaches maximum, terminal can reach or near the power output of its maximum capacity in the peak power of antenna opening output.
There is a defective in the Poewr control method of prior art, promptly according to the method described above, when up when having a plurality of time slot, though carrying out the process of numerical weighted, terminal can guarantee certain time slot, be made as TSx, reach or near the full scale input of DAC device through the digital signal of numerical weighted, but the signal that certain or some other ascending time slots may occur can't reach all the time through the digital signal of numerical weighted or near the full scale input of DAC device.
Cover relatively poor area if terminal is positioned at the sub-district, closed power control can allow terminal launch with higher power, and under the extreme condition, terminal can be launched with its peak power.Observe the power of up each time slot of terminal this moment, can find that the peak power on the time slot TSx has reached the maximum transmission power of terminal, even but the simulation power control of up each time slot of peak power terminal of all the other time slots gain has all reached maximum, may not reach its maximum transmission power as yet.Even at this moment the base station commands terminal improves the transmitting power that certain power does not reach the time slot of maximum transmission power as yet, terminal also can't improve.
Under the situation of up each time slot interference level unanimity, this can't bring adverse influence to systematic function usually; Because if the transmitting power of up each time slot is average to the significant bit of each time slot actual load at this moment, then the signal to noise ratio of every bit of different time-gap is consistent, though even the actual emission power of some time slot is lower, but because the information of its load is less, the energy of each bit can not reduce.
But owing to adopted the access way of TDMA, the interference level of each time slot is normally inconsistent; If the peak transmitted power of certain time slot of terminal does not reach the maximum transmission power of terminal, but terminal is but because the another one time slot power has reached maximum transmission power, and response is made in the order of this time slot power of lifting that can't send network side, has seriously influenced the further raising of network service quality.
For example: establish that terminal has been assigned with TS1, TS2 does ascending time slot; To have distributed a spreading factor on the TS1 be 2 code channel, and having distributed a spreading factor on the TS2 is 1 code channel, and the spreading factor of then giving first time slot is the weighted factor of 2 code channel
The spreading factor of giving second time slot is the weighted factor γ of 1 code channel
2,1=1; If up TFC has two, β
1=1/2, β
2=3/2; If the complex signal real part before every code channel spread spectrum and the span of imaginary part all are [1,1]; Suppose digital FIR filter to the peak value of digital signal without any influence; If the DAC of real part and imaginary part input is 8 bits.
Because two time slots all have only a code channel, terminal to the handling process of data as shown in Figure 3 in theory: because γ
N, iAnd β
jThe combination maximum be 3/2, and the full scale input reference signal of DAC is [127,127], therefore in actual weighted, should be β
jAmplify a rational multiple, make the span of the digital signal enter into DAC near the full scale [127,127] of DAC.Such as with β
jBe amplified to original 80 times, i.e. β
1=40, β
2=120, the actual input range of DAC can reach [120,120] like this, and the peak power of the output analog signal of DAC can be near maximum at this moment.Like this when power amplifier gain factor p reaches maximum, terminal can reach or near the power output of its maximum capacity in the peak power of antenna opening output.
But, have only the actual input range of second time slot DAC can reach [120,120] in this scheme, the actual input range of first time slot DAC can only reach [85,85].Improve power amplifier gain factor p so in any case, because the DAC output signal is less, terminal can only reach about half of its peak power output in the antenna opening output peak power of first time slot, has had a strong impact on the adjusting range of terminal transmit power, influences the service quality of whole system.
Summary of the invention
The present invention to be with regard to the technical problem that solves: propose a kind of TD-CDMA Time Division-Code Division Multiple Access mode portable terminal ascending power control method, can make each ascending time slot of terminal all have an opportunity to reach the maximum transmission power of terminal.
Time division synchronous code division multiple access mode portable terminal ascending power control method of the present invention, at each ascending time slot of distributing to terminal and each transformat combination, adjust the numerical weighted factor of each time slot, make signal maximum possible span before carrying out the digital-to-analog conversion of each time slot guarantee that near the full scale of DAC terminal can reach its peak power output at each time slot.
The present invention is by the independently digital and analog weighted coefficient for the up channel configuration, make the peak transmitted power of each ascending time slot of terminal all have an opportunity to reach the maximum transmission power of terminal, thereby avoided terminal can't promote the problem of other time slot power owing to certain time slot power has reached maximum.
Description of drawings
Fig. 1 is a digital power method of weighting schematic diagram in logic;
Fig. 2 is the Poewr control method schematic diagram of the single code channel of the single time slot of prior art;
Fig. 3 is the Poewr control method schematic diagram of a plurality of time slots of prior art and the single code channel of every time slot;
Fig. 4 is one of Poewr control method schematic diagram of the present invention;
Fig. 5 is two of a Poewr control method schematic diagram of the present invention;
Fig. 6 is the Poewr control method schematic diagram of embodiment of the invention multi-slot and the single code channel of every time slot.
Embodiment
Use the mobile communication system of time division multiple access and code division multiple access simultaneously, as TD-SCDMA, it is the 3G (Third Generation) Moblie standard that time-division S-CDMA Radio Transmission Technology has now proposed as China, be received to one of 3G (Third Generation) Moblie standard by International Telecommunications Union, the WCDMA that supports with Europe and the cdma2000 of the U.S. become 3 main standard of following Global 3G mobile communication.Other the time use the mobile communication system of time division multiple access and code division multiple access to use method of the present invention, can be with reference to following mode.
Because power control is extremely important for cdma system, at the shortcoming that exists in the prior art, the present invention proposes the mode of and analog weighted coefficient independently digital for the up channel configuration, at each ascending time slot of distributing to terminal and each transformat combination, adjust the numerical weighted factor of each time slot, make signal maximum possible span before carrying out the digital-to-analog conversion of each time slot guarantee that near the full scale of DAC terminal can reach its peak power output at each time slot.
The method of TD-SCDMA portable terminal uplink power control of the present invention as shown in Figure 4, comprises the steps:
Step 2, according to the full scale input range of DAC, be the β of each time slot
jDetermine a rational multiplication factor g
n, it is enlarged into β
N, jMake digital signal through γ
J, n, i and β
N, jAfter the gain process, enter the full scale of the digital signal maximum possible span of DAC near DAC; Wherein, β
N, jThe weighted factor of representing n ascending time slot, a j TFC;
Step 3, to each time slot n, dispose independently primary simulation weighted gain factor p
n, compensation is because of the different numerical weighted factor g of each time slot
nThe initial power that brings is unbalanced.
The method of another kind of TD-SCDMA portable terminal uplink power control of the present invention as shown in Figure 5, comprises the steps:
Step 2, according to the full scale input range of DAC, determine the reasonable multiplication factor g of a weighted factor for each time slot
n, make digital signal through γ
J, n, i, β
jAnd g
nGain process after, enter the full scale of the digital signal maximum possible span of DAC near DAC;
Step 3, to each time slot n, dispose independently primary simulation weighted gain factor p
n, compensation is because of the different numerical weighted factor g of each time slot
nThe initial power that brings is unbalanced.
Two kinds of above-mentioned Poewr control methods can be applied in the different hardware devices, thereby method of the present invention can be realized in a different manner.
In the step 1 of the present invention, because complex signal at first passes through γ
N, iWeighting is amplified, at process β
jWeighting is amplified, therefore, its seek the maximum number weighted value method can for: at each ascending time slot, seek a kind of transformat combination TFC of this time slot in every kind of transformat combination, make
Maximum as a result.The maximum number weighted value that can establish each time slot is M
n, then
The rest may be inferred; Wherein, j1 is the TFC sequence number of corresponding first time slot maximum number weighted value, and j2 is the TFC sequence number of corresponding second time slot maximum number weighted value.
In the step 2 of the present invention, judge the target multiplication factor of needs input signal according to the span of DAC; Then, the maximum weighted value that obtains divided by step 1 with the target multiplication factor obtains the β of maximum weighted time slot
jAnswer amplification multiple, determine g
nOr β
N, j
Described target multiplication factor should reach the 90-100% of DAC span; And for the ease of adjusting, multiplication factor is generally got 10 multiple.
In the step 3 of the present invention, in order to guarantee the equilibrium of each time slot Initial Trans, must be by primary simulation weighted factor p
n, adjust the actual emission power of final terminal.p
nSetting principle be: the terminal power output should meet the requirement of network to the terminal initial transmitting power.
Certainly, the maximum transmission power that allows of terminal still will be subject to the requirement to the terminal maximum transmission power of the ability of terminal equipment self and network.
Further describe technical scheme of the present invention below by specific embodiment.
As shown in Figure 6, suppose that terminal has been assigned with TS1, TS2 does ascending time slot; To have distributed a spreading factor on the TS1 be 2 code channel, and having distributed a spreading factor on the TS2 is 1 code channel, establishes up TFC and has two, β
1=1/2, β
2=3/2, establishing up spreading factor can not dynamically change, and two kinds of following two code channels of TFC situation all can use; The spreading factor of then giving first time slot is the weighted factor of 2 code channel
The spreading factor of giving second time slot is the weighted factor γ of 1 code channel
1,2,1=γ
2,2,1=1; If the complex signal real part before every code channel spread spectrum and the span of imaginary part all are [1,1]; Suppose digital FIR filter to the peak value of digital signal without any influence; If the DAC of real part and imaginary part input is 8 bits.
Because two time slots all have only a code channel, consider first time slot γ
J, 1, iAnd β
jThe combination maximum be
And the full scale input reference signal of DAC is [127,127], so in actual weighted, should be the β of first time slot
jAmplify a rational multiple, get the target multiplication factor for [120,120], make the span of the digital signal that enters into DAC near the full scale [127,127] of DAC; Then can be with β
jBe amplified to original
About 113 times, i.e. β
1,1=40, β
1,2=120, the actual input range of the DAC of first time slot can reach [120,120] like this, and the peak power of the output analog signal of DAC can be near maximum at this moment.
Consider second time slot γ
J, 2, iAnd β
jThe combination maximum be 3/2, and the full scale input reference signal of DAC is [127,127], therefore in actual weighted, should be the β of second time slot
jAmplify a rational multiple, get the target multiplication factor for [120,120], make the span of the digital signal that enters into DAC near the full scale [127,127] of DAC; Then can be with β
jBe amplified to original 120/ (3/2) promptly 80 times, i.e. β
2,1=40, β
2,2=120, the actual input range of the DAC of such second time slot can reach [120,120], and the peak power of the output analog signal of DAC can be near maximum at this moment.
Because there is deviation in the numerical weighted factor of two time slots, in order to keep the equilibrium of two time slot Initial Transs, the initial power amplifier gain factor p of two time slots is being set
nThe time need consider the deviation of numerical weighted.p
nSetting principle be: the terminal power output should meet the requirement of network to each time slot Initial Trans of terminal.Promptly the power through numeral and each the time slot output of terminal of analog weighted back all will meet the requirement of network to each time slot Initial Trans.
It should be noted last that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, and not breaking away from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1, a kind of TD-CDMA Time Division-Code Division Multiple Access mode portable terminal ascending power control method is characterized in that:
At each ascending time slot of distributing to terminal and each transformat combination, adjust the numerical weighted factor of each time slot, make signal maximum possible span before carrying out the digital-to-analog conversion of each time slot guarantee that near the full scale of DAC terminal can reach its peak power output at each time slot.
2, time division synchronous code division multiple access mode portable terminal ascending power according to claim 1
Control method is characterized in that: comprise the steps:
Step 1, for every kind of uplink format combination TFC, at each ascending time slot n, obtain the weighted factor γ of these all code channels of time slot
J, n, i, and with the corresponding weighted factor β of this TFC
jThe maximum number weighted value of combination; Wherein, γ
J, n, iRepresent under the j kind transformat combination, the weighted factor of a n ascending time slot, an i code channel; β
jThe weighted factor of representing j TFC;
Step 2, according to the full scale input range of DAC, be the β of each time slot
jDetermine a rational multiplication factor g
n, it is enlarged into β
N, jMake digital signal through γ
J, n, iAnd β
N, jAfter the gain process, enter the full scale of the digital signal maximum possible span of DAC near DAC; Wherein, β
N, jThe weighted factor of representing n ascending time slot, a j TFC;
Step 3, to each time slot n, dispose independently primary simulation weighted gain factor p
n, compensation is because of the different numerical weighted factor g of each time slot
nThe initial power that brings is unbalanced.
3, time division synchronous code division multiple access mode portable terminal ascending power control method according to claim 1 is characterized in that: comprise the steps:
Step 1, for every kind of uplink format combination TFC, at each ascending time slot n, obtain the weighted factor γ of these all code channels of time slot
J, n, i, and with the corresponding weighted factor β of this TFC
jThe maximum number weighted value of combination; Wherein, γ
J, n, iRepresent under the j kind transformat combination, the weighted factor of a n ascending time slot, an i code channel; β
jThe weighted factor of representing j TFC;
Step 2, according to the full scale input range of DAC, determine the reasonable multiplication factor g of a weighted factor for each time slot
n, make digital signal through γ
J, n, i, β
jAnd g
nGain process after, enter the full scale of the digital signal maximum possible span of DAC near DAC;
Step 3, to each time slot n, dispose independently primary simulation weighted gain factor p
n, compensation is because of the different numerical weighted factor g of each time slot
nThe initial power that brings is unbalanced.
4, according to claim 2 or 3 described time division synchronous code division multiple access mode portable terminal ascending power control methods, it is characterized in that: in the described step 1, the method of seeking the maximum number weighted value is: at each ascending time slot, seek a kind of transformat combination of this time slot in every kind of transformat combination, make
Maximum as a result.The maximum number weighted value that can establish each time slot is M
n, then
The rest may be inferred.Wherein j1 is the TFC sequence number of corresponding first time slot maximum number weighted value, and j2 is the TFC sequence number of corresponding second time slot maximum number weighted value.
5, according to claim 2 or 3 described time division synchronous code division multiple access mode portable terminal ascending power control methods, it is characterized in that: in the described step 2,
Judge the target multiplication factor of needs input signal according to the span of DAC; Then, the maximum weighted value that obtains divided by step 1 with the target multiplication factor obtains the β of maximum weighted time slot
jAnswer amplification multiple, determine g
nOr β
N, j
6, time division synchronous code division multiple access mode portable terminal ascending power control method according to claim 5, it is characterized in that: described target multiplication factor should reach the 90-100% of DAC span.
7, according to claim 2 or 3 described time division synchronous code division multiple access mode portable terminal ascending power control methods, it is characterized in that: in the described step 3, p
nThe value principle be: the terminal power output should meet network to the requirement of terminal at each ascending time slot Initial Trans.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100299359A CN100356708C (en) | 2004-04-06 | 2004-04-06 | Up-link power controlling method of mobile terminal by time division-CDMA mode |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100299359A CN100356708C (en) | 2004-04-06 | 2004-04-06 | Up-link power controlling method of mobile terminal by time division-CDMA mode |
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| CN100356708C CN100356708C (en) | 2007-12-19 |
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ID=35067668
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008034370A1 (en) * | 2006-08-22 | 2008-03-27 | Huawei Technologies Co., Ltd. | Power control device and method for up physical channel |
| WO2011035642A1 (en) * | 2009-09-23 | 2011-03-31 | 中兴通讯股份有限公司 | Power regulation method and terminal |
| CN102121981A (en) * | 2010-12-16 | 2011-07-13 | 哈尔滨工业大学 | Method for restricting static directional pattern sidelobe based on subarray-level digital weighting |
| WO2011153967A1 (en) * | 2010-06-11 | 2011-12-15 | 中兴通讯股份有限公司 | Method and device for power ratio allocation in multiple code channels |
| US8195217B2 (en) | 2006-08-22 | 2012-06-05 | Huawei Technologies Co., Ltd. | Method and apparatus for controlling power of uplink physical channel |
| CN101529831B (en) * | 2006-10-31 | 2013-05-01 | 高通股份有限公司 | Random access device and method for wireless communication |
| CN101925165B (en) * | 2007-08-15 | 2015-05-06 | 华为技术有限公司 | Power control method and device for uplink physical channel |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1146167C (en) * | 2001-07-18 | 2004-04-14 | 华为技术有限公司 | Power control method in CDMA communication system |
| CN1149772C (en) * | 2001-07-20 | 2004-05-12 | 华为技术有限公司 | Transmission method of special physical control channel with power bias |
| US6717931B2 (en) * | 2002-01-02 | 2004-04-06 | Nokia Corporation | Adaptive spreading factor based on power control |
-
2004
- 2004-04-06 CN CNB2004100299359A patent/CN100356708C/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008034370A1 (en) * | 2006-08-22 | 2008-03-27 | Huawei Technologies Co., Ltd. | Power control device and method for up physical channel |
| US7729717B2 (en) | 2006-08-22 | 2010-06-01 | Huawei Technologies Co., Ltd. | Method and apparatus for controlling power of uplink physical channel |
| US8014814B2 (en) | 2006-08-22 | 2011-09-06 | Huawei Technologies Co., Ltd. | Method and apparatus for controlling power of uplink physical channel |
| US8195217B2 (en) | 2006-08-22 | 2012-06-05 | Huawei Technologies Co., Ltd. | Method and apparatus for controlling power of uplink physical channel |
| CN101405953B (en) * | 2006-08-22 | 2012-08-29 | 华为技术有限公司 | Power control method and apparatus for ascending physical signal channel |
| US8271017B2 (en) | 2006-08-22 | 2012-09-18 | Huawei Technologies Co., Ltd. | Method and apparatus for controlling power of uplink physical channel |
| CN101529831B (en) * | 2006-10-31 | 2013-05-01 | 高通股份有限公司 | Random access device and method for wireless communication |
| CN101925165B (en) * | 2007-08-15 | 2015-05-06 | 华为技术有限公司 | Power control method and device for uplink physical channel |
| WO2011035642A1 (en) * | 2009-09-23 | 2011-03-31 | 中兴通讯股份有限公司 | Power regulation method and terminal |
| WO2011153967A1 (en) * | 2010-06-11 | 2011-12-15 | 中兴通讯股份有限公司 | Method and device for power ratio allocation in multiple code channels |
| CN102121981A (en) * | 2010-12-16 | 2011-07-13 | 哈尔滨工业大学 | Method for restricting static directional pattern sidelobe based on subarray-level digital weighting |
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| CN100356708C (en) | 2007-12-19 |
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