CN103391606A - Transmission power control method and device - Google Patents
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Abstract
The invention provides a transmission power control (TPC) method and device. The TPC method comprises the following steps of carrying out joint detection on received signals to obtain output symbols of the joint detection, accumulating a preset number of the output symbols of the joint detection to obtain soft information of the accumulated output symbols of the joint detection, calculating bit average amplitude and bit average variance according to the soft information of the accumulated output symbols of the joint detection, calculating signal-noise ratio (SNR) according to the bit average amplitude and bit average variance, and carrying out TRC according to the SNR. By means of the TPC method and device, the accuracy of TPC can be improved.
Description
Technical field
The present invention relates to mobile communication technology, relate in particular to a kind of through-put power and control (Transmit Power Control is called for short TPC) method and apparatus.
Background technology
In time-division (Time Division is called for short TD) network, when there is no business, can send special burst (Special Burst is called for short SB), its effect only is used for keeping the synchronous of link.On the R4 carrier wave, the time of SB will account for 50% of whole air times; On high-speed packet access (High Speed Packet Access is called for short HSPA) carrier wave, follow channel only to be used for command transmitting, having what surpass that time of 90% follows that channel sends is SB.In the TD on basis network, the transmitting power that emission SB adopts is identical with the transmitted power of transmitting business the data, and therefore, under the scene without business, the existence of SB can cause problem of co-channel interference.
At present, being on the increase of TD number of users, because the frequency resource has finiteness, problem of co-channel interference is more and more serious.The conversation loss that is caused by problem of co-channel interference or user experience variation becomes a class problem more serious in existing network.In order to reduce the harm of co-channel interference, improved TD network has appearred, wherein utilize the data characteristics of SB, reduce its transmitting power.
After the transmitting power that reduces SB, the signal to noise ratio of the signal that receives (Signal to Noise Ratio is called for short SNR) diminishes, if still adopt original SNR method of estimation, the SNR after can't reducing the SB transmitting power accurately estimates., according to the SNR that adopts existing SNR method of estimation to obtain, can't carry out power accurately and control.
Summary of the invention
First aspect of the present invention is to provide a kind of TPC method,, in order to solve defect of the prior art, improves the accuracy of TPC.
Another aspect of the present invention is to provide a kind of TPC device,, in order to solve defect of the prior art, improves the accuracy of TPC.
First aspect of the present invention is to provide a kind of through-put power and controls the TPC method, comprising:
Carry out to received signal joint-detection, obtain the output symbol of joint-detection;
The output symbol of the described joint-detection of cumulative default number, the soft information of the output symbol of the joint-detection after obtaining to add up;
, according to the soft information of the output symbol of described joint-detection after cumulative, calculate bit average amplitude and bit average variance;
, according to described bit average amplitude and bit average variance, calculate signal to noise ratio snr;
Carry out TPC according to described SNR.
Method as above, wherein, the output symbol of the described joint-detection of described cumulative default number, the soft information of the output symbol of the joint-detection after obtaining to add up comprises:
Remove transformat combination indication TFCI word, the power of element in the joint-detection output symbol and control TPC word and simultaneous bias SS word, obtain the first symbol;
Calculate the soft information of described the first symbol;
The soft information of described first symbol of cumulative default number, obtains the soft information of the output symbol of the joint-detection after described adding up.
Method as above, wherein, the soft information of described the first symbol of described calculating comprises:
Adopt b
i'=real (d '
i)+imag (d '
i) j calculates the soft information of described the first symbol, wherein, i=1,2 ..., 44*kc, b '
iThe soft information that represents i the first symbol, d '
iRepresent i the first symbol, real represents realistic computing, and imag represents to ask imaginary-part operation, and j represents imaginary unit, and kc represents described default number.
Method as above, wherein, the soft information of described first symbol of described cumulative default number,
The soft information of the output symbol of the joint-detection after expression is cumulative, b '
iRepresent the soft information of i the first symbol, kc represents described default number.
Method as above, wherein, described default number is the number of the empty code channel of each user's use of every time slot.
Another aspect of the present invention is to provide a kind of through-put power and controls the TPC device, comprising:
Detecting unit, be used for carrying out to received signal joint-detection, obtains the output symbol of joint-detection;
Cumulative unit, be used for the cumulative output symbol of presetting the described joint-detection of number, the soft information of the output symbol of the joint-detection after acquisition is cumulative;
The first computing unit, be used for the soft information according to the output symbol of the joint-detection after described adding up, and calculates bit average amplitude and bit average variance;
The second computing unit, be used for according to described bit average amplitude and bit average variance, calculates signal to noise ratio snr;
Power control unit, be used for carrying out TPC according to described SNR.
Device as above, wherein, described cumulative unit comprises:
Control word is removed subelement, is used for removing transformat combination indication TFCI word, power control TPC word and the simultaneous bias SS word of joint-detection output symbol element, obtains the first symbol;
Soft information computation subunit, for the soft information of calculating described the first symbol;
The soft information subelement that adds up, be used for the soft information of described first symbol of cumulative default number, obtains the soft information of the output symbol of the joint-detection after described adding up.
Device as above, wherein, described soft information computation subunit specifically is used for adopting b '
i=real (d
i)+imag (d
i) j calculates the soft information of described the first symbol, wherein, i=1,2 ..., 44*kc, b '
iThe soft information that represents i the first symbol, d
iRepresent i the first symbol, real represents realistic computing, and imag represents to ask imaginary-part operation, and j represents imaginary unit, and kc represents described default number.
Device as above, wherein, the cumulative subelement of described soft information specifically is used for adopting
Calculate the soft information of the output symbol of described joint-detection after cumulative, wherein, a
mThe soft information of the output symbol of the joint-detection after expression is cumulative, b '
iRepresent the soft information of i the first symbol, kc represents described default number.
Device as above, wherein, described default number is the number of the empty code channel of each user's use of every time slot.
By the foregoing invention content as seen, after the output symbol that obtains joint-detection, at first the output symbol of joint-detection added up, the soft information of the output symbol of the joint-detection after then basis adds up is calculated bit average amplitude and bit average variance, and then calculate the estimated value of SNR, carry out through-put power according to the estimated value of this SNR and control.Because the SNR estimated value is to calculate and obtain according to the output symbol after cumulative, therefore in the situation that reduce the transmitting power of SB, calculate according to the output symbol after cumulative, can obtain SNR result of calculation more accurately, improve the accuracy that SNR estimates, thereby improved the accuracy that through-put power is controlled.
Description of drawings
Fig. 1 is the flow chart of the TPC method of the embodiment of the present invention one;
Fig. 2 is the flow chart of the TPC method of the embodiment of the present invention two;
Fig. 3 is the structural representation of the TPC device of the embodiment of the present invention three.
Embodiment
Because the bit pattern (Bit Pattern) of SB is " 0x5 ", after receiving SB, contain identical modulation intelligence in the output symbol of joint-detection, therefore, in embodiments of the present invention, represent the number of the empty code channel that each user of every time slot uses with kc, kc and spreading factor (Spreading Factor, abbreviation SF) numerical value is relevant, kc=16/SF.First the output symbol of every kc joint-detection is summed into a symbol, the sum that represents the output symbol of the cumulative rear joint-detection that obtains with N, obtain altogether N the symbol after cumulative, and then use symbol after cumulative to carry out SNR and estimate, thereby estimate exactly the value of low signal-to-noise ratio.
Fig. 1 is the flow chart of the transmission power control method of the embodiment of the present invention one.As shown in Figure 1, the method comprises following process.
Step 101: carry out to received signal joint-detection, obtain the output symbol of joint-detection.
Particularly, the method for the embodiment of the present invention one can be applied to base station (Node B is called for short NB) or subscriber equipment (User Equipment is called for short UE).When being applied to NB, in this step, receiving signal is the uplink receiving signal, and NB carries out joint-detection to the uplink receiving signal, obtains the output symbol of joint-detection.When being applied to UE, in this step, the reception signal is down receiving signal, and UE carries out joint-detection to down receiving signal, obtains the output symbol of joint-detection.
Step 102: the output symbol of the joint-detection of cumulative default number, the soft information of the output symbol of the joint-detection after obtaining to add up.
In this step, default number can be kc, and kc represents the number of the empty code channel that each user of every time slot uses, particularly, and kc=16/SF.
Step 103:, according to the soft information of the output symbol of the joint-detection after cumulative, calculate bit average amplitude and bit average variance.
Step 104:, according to bit average amplitude and bit average variance, calculate SNR.
Step 105: according to SNR, carry out TPC.
Particularly, the method for the embodiment of the present invention one can be applied to NB or UE.When being applied to NB, in this step, the SNR that NB calculates according to step 104 carries out TPC to the uplink transmission power of UE.When being applied to UE, in this step, the SNR that UE calculates according to step 104 carries out TPC to the down transmitting power of NB.
In the embodiment of the present invention one, after the output symbol that obtains joint-detection, at first the output symbol of joint-detection added up, the soft information of the output symbol of the joint-detection after then basis adds up is calculated bit average amplitude and bit average variance, and then calculate the estimated value of SNR, carry out through-put power according to the estimated value of this SNR and control.Because the SNR estimated value is to calculate and obtain according to the output symbol after cumulative, therefore in the situation that reduce the transmitting power of SB, calculate according to the output symbol after cumulative, can obtain SNR result of calculation more accurately, improve the accuracy that SNR estimates, thereby improved the accuracy that through-put power is controlled.
Fig. 2 is the flow chart of the transmission power control method of the embodiment of the present invention two.As shown in Figure 2, the method comprises following process.In the embodiment of the present invention two, default number is the number that each user of every time slot uses empty code channel, with kc, represents.
Step 201: carry out to received signal joint-detection, obtain the output symbol of joint-detection.
Particularly, the method for the embodiment of the present invention two can be applied to NB or UE.When being applied to NB, in this step, receiving signal is the uplink receiving signal, and NB carries out joint-detection to the uplink receiving signal, obtains the output symbol of joint-detection.When being applied to UE, in this step, the reception signal is down receiving signal, and UE carries out joint-detection to down receiving signal, obtains the output symbol of joint-detection.
After step 201, the output symbol of the joint-detection of cumulative default number, the soft information of the output symbol of the joint-detection after obtaining to add up.This process specifically can comprise the following steps 201 to step 204.
Step 202: transformat combination indication (the Transport Format Combination Indicator that removes element in the joint-detection output symbol, abbreviation TFCI) command word, TPC command word and simultaneous bias (Synchronization Shift, be called for short SS) command word, obtain the first symbol.
In this step, the output symbol of joint-detection is designated as d
i, i=1,2 ..., 44*kc, wherein, kc represents that each user of every time slot uses the number of code channel.To d
iMiddle element is removed TFCI word, TPC word and SS word.The output symbol of removing the joint-detection that obtains after TFCI word, TPC word and SS word is called the first symbol, the first symbol is designated as d '
i, i=1,2 ..., 44*kc.
Step 203: the soft information of calculating the first symbol.
In this step, with d '
iRepresent i the first symbol, namely i the output symbol of removing the joint-detection that obtains after TFCI word, TPC word and SS word, adopt following formula to calculate d '
iSoft information:
b′
i=real(d′
i)+imag(d′
i)·j
Wherein, i=1,2 ..., 44*kc, b '
iRepresent the soft information of i the first symbol, real represents realistic computing, and imag represents to ask imaginary-part operation, and j represents imaginary unit.
Step 204: the soft information of cumulative kc the first symbol, the soft information of the output symbol of the joint-detection after obtaining to add up.
In this step, default number is specially kc.With a
mThe soft information of the output symbol of the joint-detection after expression is cumulative, to every kc b '
iAdd up, obtain a
m, concrete accumulation method is:
The a of cumulative soft information acquisition in this step
mBe the soft information of the output symbol of the joint-detection after adding up.
Step 205:, according to the soft information of the output symbol of the joint-detection after cumulative, calculate the bit average amplitude.
In this step, specifically according to following formula, calculate the bit average amplitude:
Wherein,
Expression bit average amplitude, N represents the sum of the output symbol of the cumulative rear joint-detection that obtains.N is determined by the numerical value of frame structure and kc, frame structure for particular type, output symbol with joint-detection of some, after therefrom removing TFCI command word, TPC command word and the SS command word of element in the joint-detection output symbol, the sum of every kc output symbol is summed into an output symbol, thereby at the cumulative rear output symbol that obtains N joint-detection.
Step 206:, according to the soft information of the output symbol of the joint-detection after cumulative, calculate the bit average variance.
In this step, specifically according to following formula, calculate the bit average variance:
Wherein,
Expression bit average variance.
Step 207:, according to bit average amplitude and bit average variance, calculate SNR.
In this step, specifically according to following formula, calculate SNR:
Step 208: according to SNR, carry out TPC.
Particularly, the method for the embodiment of the present invention two can be applied to NB or UE.When being applied to NB, in this step, the SNR that NB calculates according to step 207 carries out TPC to the uplink transmission power of UE.When being applied to UE, in this step, the SNR that UE calculates according to step 207 carries out TPC to the down transmitting power of NB.Particularly, preset the SNR desired value, SNR and predefined SNR desired value that step 207 is obtained compare, if the SNR that step 207 obtains reduces through-put power greater than predefined SNR desired value; Otherwise, if the SNR that step 207 obtains less than predefined SNR desired value, through-put power raises.
In the embodiment of the present invention two, after the output symbol that obtains joint-detection, the output symbol of removing TFCI command word, TPC command word and SS command word is calculated soft information, soft information to kc output symbol adds up, the soft information of the output symbol of the joint-detection after then basis adds up is calculated bit average amplitude and bit average variance, and then calculate the estimated value of SNR, carry out through-put power according to the estimated value of this SNR and control.Because the SNR estimated value is to calculate and obtain according to the output symbol after cumulative, therefore in the situation that reduce the transmitting power of SB, calculate according to the output symbol after cumulative, can obtain SNR result of calculation more accurately, improve the accuracy that SNR estimates, thereby improved the accuracy that through-put power is controlled.Fig. 3 is the structural representation of the TPC device of the embodiment of the present invention three.As shown in Figure 3, this device comprises: detecting unit 31, cumulative unit 32, the first computing unit 33, the second computing unit 34 and power control unit 35.
Wherein, detecting unit 31 is used for carrying out to received signal joint-detection, obtains the output symbol of joint-detection.Cumulative unit 32 is used for the output symbol of the joint-detection of cumulative default number, the soft information of the output symbol of the joint-detection after acquisition is cumulative.The first computing unit 33 is used for the soft information according to the output symbol of the joint-detection after cumulative, calculates bit average amplitude and bit average variance.The second computing unit 34 is used for according to bit average amplitude and bit average variance, calculates SNR.Power control unit 35 is used for carrying out TPC according to SNR.
On the basis of technique scheme, further, this cumulative unit 32 comprises: control word is removed the cumulative subelement 323 of subelement 321, soft information computation subunit 322 and soft information.Wherein, control word is removed subelement 321 and is used for removing TFCI word, TPC word and the SS word of joint-detection output symbol element, obtains the first symbol.Soft information computation subunit 322 is used for calculating the soft information of the first symbol.The cumulative subelement 323 of soft information is used for the soft information of the first symbol of cumulative default number, the soft information of the output symbol of the joint-detection after acquisition is cumulative.
On the basis of technique scheme, further, the concrete employing b ' that is used for of soft information computation subunit 322
i=real (d '
i)+imag (d '
i) j calculates the soft information of the first symbol, wherein, i=1,2 ..., 44*kc, b '
iThe soft information that represents i the first symbol, d' represents i the first symbol, and real represents realistic computing, and imag represents to ask imaginary-part operation, and j represents imaginary unit, kc represents default number.
On the basis of technique scheme, further, the cumulative subelement 323 of soft information is concrete for adopting
Calculate the soft information of the output symbol of the joint-detection after adding up, wherein, a
mThe soft information of the output symbol of the joint-detection after expression is cumulative, b '
iThe soft information that represents i the first symbol, kc represents default number.
The first computing unit 33 is used for the soft information according to the output symbol of the joint-detection after cumulative, calculates bit average amplitude and bit average variance.Particularly, the first computing unit 33 first calculates the bit average amplitude according to following formula:
Wherein,
Expression bit average amplitude, N represents the sum of the output symbol of the cumulative rear joint-detection that obtains.N is determined by the numerical value of frame structure and kc, frame structure for particular type, output symbol with joint-detection of some, after therefrom removing TFCI command word, TPC command word and the SS command word of element in the joint-detection output symbol, the sum of every kc output symbol is summed into an output symbol, thereby at the cumulative rear output symbol that obtains N joint-detection.Then, the first computing unit 33 calculates the bit average variance according to following formula:
Wherein,
Expression bit average variance.
The second computing unit 34 is used for according to bit average amplitude and bit average variance, calculates SNR.Particularly, the second computing unit 34 calculates SNR according to following formula:
On the basis of technique scheme, further, default number is the number of the empty code channel of each user's use of every time slot.
In the transmission power control apparatus of the embodiment of the present invention three, the concrete executive mode of unit and subelement thereof can be referring to the record of the transmission power control method of the embodiment of the present invention one and the embodiment of the present invention two.
In the embodiment of the present invention three, obtain the output symbol of joint-detection at detecting unit after, cumulative unit adds up to kc output symbol, then the first computing unit calculates bit average amplitude and bit average variance according to the soft information of the output symbol of the joint-detection after cumulative, and then second computing unit calculate the estimated value of SNR, the through-put power control unit carries out power according to the estimated value of this SNR and controls.Because the SNR estimated value is to calculate and obtain according to the output symbol after cumulative, therefore in the situation that reduce the transmitting power of SB, calculate according to the output symbol after cumulative, can obtain SNR result of calculation more accurately, improve the accuracy that SNR estimates, thereby improved the accuracy that through-put power is controlled.
One of ordinary skill in the art will appreciate that: all or part of step that realizes above-mentioned each embodiment of the method can be completed by the hardware that program command is correlated with.Aforesaid program can be stored in a computer read/write memory medium.This program when carrying out, is carried out the step that comprises above-mentioned each embodiment of the method; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that finally: above each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to aforementioned each embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps some or all of technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a through-put power is controlled the TPC method, it is characterized in that, comprising:
Carry out to received signal joint-detection, obtain the output symbol of joint-detection;
The output symbol of the described joint-detection of cumulative default number, the soft information of the output symbol of the joint-detection after obtaining to add up;
, according to the soft information of the output symbol of described joint-detection after cumulative, calculate bit average amplitude and bit average variance;
, according to described bit average amplitude and bit average variance, calculate signal to noise ratio snr;
Carry out TPC according to described SNR.
2. method according to claim 1, is characterized in that, the output symbol of the described joint-detection of described cumulative default number, and the soft information of the output symbol of the joint-detection after obtaining to add up comprises:
Remove transformat combination indication TFCI word, the power of element in the joint-detection output symbol and control TPC word and simultaneous bias SS word, obtain the first symbol;
Calculate the soft information of described the first symbol;
The soft information of described first symbol of cumulative default number, obtains the soft information of the output symbol of the joint-detection after described adding up.
3. method according to claim 2, is characterized in that, the soft information of described the first symbol of described calculating comprises:
Adopt b '
i=real (d '
i)+imag (d '
i) j calculates the soft information of described the first symbol, wherein, i=1,2 ..., 44*kc, b '
iThe soft information that represents i the first symbol, d '
iRepresent i the first symbol, real represents realistic computing, and imag represents to ask imaginary-part operation, and j represents imaginary unit, and kc represents described default number.
4. method according to claim 2, is characterized in that, the soft information of described first symbol of described cumulative default number, and the soft information that obtains the output symbol of the joint-detection after described adding up comprises:
Adopt
Calculate the soft information of the output symbol of described joint-detection after cumulative, wherein, a
mThe soft information of the output symbol of the joint-detection after expression is cumulative, b '
iRepresent the soft information of i the first symbol, kc represents described default number.
5. the described method of any one according to claim 1 to 4, is characterized in that,
Described default number is the number of the empty code channel of each user's use of every time slot.
6. a through-put power is controlled the TPC device, it is characterized in that, comprising:
Detecting unit, be used for carrying out to received signal joint-detection, obtains the output symbol of joint-detection;
Cumulative unit, be used for the cumulative output symbol of presetting the described joint-detection of number, the soft information of the output symbol of the joint-detection after acquisition is cumulative;
The first computing unit, be used for the soft information according to the output symbol of the joint-detection after described adding up, and calculates bit average amplitude and bit average variance;
The second computing unit, be used for according to described bit average amplitude and bit average variance, calculates signal to noise ratio snr;
Power control unit, be used for carrying out TPC according to described SNR.
7. device according to claim 6, is characterized in that, described cumulative unit comprises:
Control word is removed subelement, is used for removing transformat combination indication TFCI word, power control TPC word and the simultaneous bias SS word of joint-detection output symbol element, obtains the first symbol;
Soft information computation subunit, for the soft information of calculating described the first symbol;
The soft information subelement that adds up, be used for the soft information of described first symbol of cumulative default number, obtains the soft information of the output symbol of the joint-detection after described adding up.
8. device according to claim 7, is characterized in that,
Described soft information computation subunit specifically is used for adopting b '
i=real (d
i)+imag (d
i) j calculates the soft information of described the first symbol, wherein, i=1,2 ..., 44*kc, b '
iThe soft information that represents i the first symbol, d
iRepresent i the first symbol, real represents realistic computing, and imag represents to ask imaginary-part operation, and j represents imaginary unit, and kc represents described default number.
9. device according to claim 7, is characterized in that,
The cumulative subelement of described soft information specifically is used for adopting
Calculate the soft information of the output symbol of described joint-detection after cumulative, wherein, a
mThe soft information of the output symbol of the joint-detection after expression is cumulative, b '
iRepresent the soft information of i the first symbol, kc represents described default number.
10. the described device of any one according to claim 6 to 9, is characterized in that,
Described default number is the number of the empty code channel of each user's use of every time slot.
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| CN105744547A (en) * | 2014-12-10 | 2016-07-06 | 联芯科技有限公司 | WCDMA system synchronization desynchronizing detection method and device |
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| CN1454015A (en) * | 2002-04-25 | 2003-11-05 | 三星电子株式会社 | Power controllable radio mobile communication system and method |
| CN101207401A (en) * | 2006-12-22 | 2008-06-25 | 大唐移动通信设备有限公司 | Apparatus, base station, terminal unit and method for obtaining signal-noise ratio and amplitude-noise ratio |
| CN101931491A (en) * | 2009-06-22 | 2010-12-29 | 大唐移动通信设备有限公司 | Data processing device and method for processing data thereby |
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| CN1454015A (en) * | 2002-04-25 | 2003-11-05 | 三星电子株式会社 | Power controllable radio mobile communication system and method |
| CN101207401A (en) * | 2006-12-22 | 2008-06-25 | 大唐移动通信设备有限公司 | Apparatus, base station, terminal unit and method for obtaining signal-noise ratio and amplitude-noise ratio |
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| CN105744547A (en) * | 2014-12-10 | 2016-07-06 | 联芯科技有限公司 | WCDMA system synchronization desynchronizing detection method and device |
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