CN1281323A - Method and device for controlling transmitting power of base station in CDMA system - Google Patents
Method and device for controlling transmitting power of base station in CDMA system Download PDFInfo
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- CN1281323A CN1281323A CN99116293A CN99116293A CN1281323A CN 1281323 A CN1281323 A CN 1281323A CN 99116293 A CN99116293 A CN 99116293A CN 99116293 A CN99116293 A CN 99116293A CN 1281323 A CN1281323 A CN 1281323A
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Abstract
A method and equipment for controlling the emitting power of base station in CDMA system is disclosed. The mobile station receives and processes the characteristic frames of base station to correctly receive said characteristic frames even in lower S/N ratio, so reducing the transmitting power of base station and system interference and increasing capacity. Said method can be implemented by hardware of mobile station or software in DSP unit.
Description
The present invention relates to moving communicating field, relate in particular to the Poewr control method and the device thereof of the mobile communication system of employing code division multiple access mode.
The multi-access mode of having used in the mobile communication mainly contains frequency division multiple access (FDMA), time division multiple access (TDMA) and code division multiple access (CDMA) etc.In TDMA and FDMA system, different channels is respectively to be distinguished by different time slots or different frequencies, and cdma system is to distinguish different channels according to signal code type difference.Conventional cdma system proposes in the TIA/EIA/IS-95 standard, its operation principle is: give each channel allocation different pseudorandom (PN) sign indicating numbers, the information of different user is expanded into wide band signal by multiplying each other with separately PN sign indicating number, and a such broadband signal is launched away through certain modulation again.At receiving terminal, receiver uses PN sign indicating number identical with transmitting terminal and the signal reciprocal multiplication that receives, and the result who does like this is the frequency range that the frequency bandwidth of the signal that receives is restored to user profile.In the process of such spread spectrum and despreading, because frequency band is broadened, interference and noise signal are weakened.If the correlation between the PN sign indicating number is very little, all users can use identical frequency band to communicate simultaneously so, and their information of emission still can separatedly be opened.
As from the foregoing, because all users' signal is to launch simultaneously in identical frequency band, the factor that influences power system capacity so is exactly the phase mutual interference between the subscriber signal.And in cellular system, the transmitting power of a base station also can cause interference to the sub-district of using identical frequency band on every side, therefore, must the transmitting power of base station be control effectively, and reduces the interference to other travelling carriages and sub-district.
In common forward power control method, at the travelling carriage access phase, the base station is directly to launch forward business signal as Initial Trans to this travelling carriage with current all users' average transmit power, and progressively strengthens transmitting power in the mode that log-linear increases.After the channel allocation signaling of travelling carriage on receiving paging channel, begin operating on the Traffic Channel, receive the forward traffic channel data of base station.Mobile station receiver produces the statistical information of frame error rate and to base station feedback after decoding.The base station utilizes this feedback information to calculate transmitting power (P) required when this travelling carriage is transmitted regular traffic (signaling or speech), and this power depends on the current transmitting power to this travelling carriage of feedback information and base station of travelling carriage.The employed base station transmitting power of such access procedure is bigger, is easy to interference is caused in user and other sub-districts of conversing, so that reduce the capacity of system.
The objective of the invention is to overcome the deficiencies in the prior art part, and the control method and the device thereof of base station transmitting power in the code division multiple access system that a kind of transmitting power reduces are provided.
The object of the present invention is achieved like this, and the base station in the existing cdma system is blank frame at access phase to the forward business signal of travelling carriage emission, is used for guaranteeing that the forward link between base station and the travelling carriage normally sets up.Have certain combination of features mode because blank frame is complete " 0 " or complete " 1 " or other, be referred to herein as the feature frame, therefore, travelling carriage can utilize the information of this repetition to carry out diversity reception, reduces the transmitting power of access phase base station.
The invention provides the control method of base station transmitting power in a kind of code division multiple access system, it is characterized in that, may further comprise the steps: transmitting power with the travelling carriage emission characteristic frame of predetermined Initial Trans to access phase, and is progressively strengthened in (1) base station on forward traffic channel; (2) travelling carriage carries out overlap-add procedure to the feature frame that receives, and the feature frame after handling is detected; (3) travelling carriage produces feedback information according to the testing result to the feature frame, and this feedback information is multiplexed into travelling carriage in the reverse traffic channel frame that the base station sends; (4) base station calculates transmitting power (P) required when this travelling carriage is transmitted regular traffic according to the current transmitting power to this travelling carriage of described feedback information and base station that receives.
The present invention also provides a kind of device of realizing the inventive method, comprises base station transmitting/receiving device and travelling carriage R-T unit.Wherein, the travelling carriage R-T unit comprises demodulation despread unit, feedback information generation unit, CDMA data generation unit and reflector.It is characterized in that the digital demodulation despread unit of described travelling carriage comprises the n road accumulator (n is greater than 1) that parallel setting and integration scavenging period prolong, and latchs and control gating unit and Digital Signal Processing (DSP) unit.The data that travelling carriage receives are imported described n road accumulator simultaneously, and the output of described n road accumulator enters the DSP processing unit through latching and control gating unit respectively; Latch and control gating unit and the DSP unit all outputs a control signal to the feedback information generation unit; The feedback information that the feedback information generation unit produces is admitted to CDMA data generation unit, sends to the base station by reflector then.
The control method of base station transmitting power and device thereof in the code division multiple access system of the present invention, by travelling carriage the diversity reception of the feature frame of base station is handled, make it under the condition of less signal to noise ratio, still can correctly receive the feature frame that sends the base station, thereby reduce the transmitting power of base station at access phase, minimizing increases power system capacity to the interference of system.Of the present invention consistent reliable, have very strong practicality and economic benefit.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Fig. 1 is the transmission-receiving function block diagram of base station in the inventive method;
Fig. 2 is the transmission-receiving function block diagram of travelling carriage in the inventive method;
Fig. 3 is the digital demodulation and the despreading functional block diagram of travelling carriage in the inventive method;
To be the DSP unit merge the flow chart of processing to two and four symbols to Fig. 4.
As shown in Figure 1, in one embodiment of the invention, the transmission-receiving function of base station is realized by variable gain emission amplifier 11, power control unit 12, automatic gain receiver 13 and demodulating unit 14.Wherein, variable gain emission amplifier 11 is used for the data-signal of transmitting base station to this travelling carriage, the power gain of variable gain amplifier 11 is controlled by power control unit 12, and power control unit 12 receives information that base station control unit send or the feedback information of the travelling carriage that comes out from demodulating unit 14 demodulation calculates transmitting power gain to this travelling carriage.
At the travelling carriage access phase, the base station by paging channel to the travelling carriage assignment behind the forward traffic channel, on forward traffic channel, allow travelling carriage receive earlier, to guarantee the foundation of forward service link to this travelling carriage emission characteristic frame (complete " 1 ", complete " 0 " or further feature mode).In emission characteristic image duration, power control unit 12 is set the gain of variable gain amplifier as follows:
The first step, base station control unit is scheduled to an Initial Trans, should predetermined Initial Trans can be current all users' average transmit power, or by other power control algorithms or strategy calculate performance number, and send this value to power control unit 12.
In second step, the predetermined transmitting power that power control unit 12 will be received on duty with a decay factor is as the power to first feature frame of this travelling carriage emission.
This decay factor is a lowest transmit power of taking the special processing mode that the base station can be reduced owing to travelling carriage, and it is relevant with the factors such as speed of the environment of the mode of modulation, sub-district, travelling carriage translational speed.This decay factor can be pre-set, also can once adjust every a period of time.For example, in IS-95, be to use the QPSK band spectrum modulation during base station forward traffic channel signal, adopt the auxiliary coherent demodulation of pilot tone when travelling carriage receives the forward business signal, utilize non-modulation pilot signal to come the amplitude and the phase place of multipath are estimated.Consider that each multipath composition is the phase independent random variables, Rayleigh distributed, and the estimation of amplitude and phase place had under the situation of certain error, the upper bound of the error probability of demodulator output is:
Here, the Pe energy of the symbol that has been lowered behind the chip of representing to superpose; A
0It is the gain of pilot tone; N
pIt is the number of chips that is used for estimating the pilot tone of amplitude and phase place; N is the number of the modulation symbol of stack; E is the energy of each symbol of Traffic Channel.Can calculate by this formula and to guarantee to make the minimum value of symbol energy reduction by the stack chip under the constant condition of error probability.The ratio of the decay factor required symbol energy that is exactly this minimum value when not adopting the chip stack.The minimum value that result of calculation obtains decay factor is 0.4.In different systems, because the difference of modulation demodulation system, the formula of calculating can be different, but its principle does not still break away from category of the present invention.
In the 3rd step, in the feature frame of emission subsequently, transmitting power increases with a step-length of setting according to the mode of log-linear, and every frame or every a few frame increase once, catch the reverse traffic channel of travelling carriage up to the base station.
Fig. 2 is the reception and the emission function block diagram of travelling carriage.Its receiving unit is a kind of implementation of cdma receiver, also is made up of filter, mould/number (A/D) conversion, digital demodulation despreading and the decoding unit of routine.The baseband signal of filter 21 outputs is transformed into digital signal through A/D converter 22, be input in the digital despread unit 24 by a digital filter 23 again, signal is done relevant treatment with user's long code in digital despread unit 24, carry out despreading, bandwidth returns to the bandwidth of base-band information, obtains user data through decoding unit 25 at last.In the CDMA of routine power control, mobile station receiver produces the statistical information of frame error rate and to base station feedback after decoding.In the method for the present invention, travelling carriage receives the feature frame of base station at access phase, and directly produces feedback information from demodulating unit after receiving the continuous effective frame, sends to the base station by reverse traffic channel.The base station utilizes the feedback information that receives to calculate the required power of emission regular traffic.
Fig. 3 is the detailed functions figure of the digital demodulation and the despread unit of travelling carriage in the inventive method.I after digital filter 31 is handled, the data of Q branch road are merged into one the tunnel with the relevant back of long code of user's special use in adder 32, enter accumulator (being actually a digital integrator).Has only No. one accumulator in the conventional demodulator, by the control of integration purge signal all chips in the time of a modulation symbol are added up, the result who adds up is input in the DSP unit through latch and adjudicates, and produces symbol and outputs to decoder, thereby solve user's information.The DSP here also can be the judgement or the treatment circuit of other kinds, does not break away from the category of the inventive method.
Be provided with three accumulators (also can be more) in the inventive method.The integration purge signal cycle of the accumulator in the cycle of the integration purge signal of the first accumulator 33a and the top conventional demodulator of saying is identical, promptly adds up in the time of a symbol.The integration purge signal of controlling the second accumulator 33b is to be obtained through after 1/2nd frequency divider 34a by the integration purge signal of controlling accumulator 33a, its cycle has increased by one times, therefore accumulator 33b added up to chip in the time of two modulation symbols, and actual is that two modulation symbols are superposeed.Because the information in the known features frame is regular repetition, therefore such adding up is actually and carried out the time diversity reception, can solve correct information under the lower condition of signal to noise ratio.The integration purge signal of controlling the 3rd accumulator 33c is that integration purge signal by accumulator 33b obtains after through 1/2nd frequency divider 34b, by described above in like manner as can be known, accumulator 33c superposes to four modulation symbols, can solve correct information under lower signal to noise ratio condition.Realize also having other method to achieve this end the mode of stack of symbol except this by increasing the integration scavenging period, will be specified in a second embodiment.
As can be seen from Figure 3, three accumulator 33a, 33b, 33c are concurrent workings, their output is all passed through and is latched and control gating unit 35 and enter DSP processing unit 36 and adjudicate.Latch and control gating unit 35 and also control (not shown) by certain clock, the each output of No. one accumulator is sent in the DSP unit 36 handled.For example, the data that gating first via accumulator 33a comes when first symbol time finishes; The data of difference gating the one 33a and No. the second accumulator 33b when second symbol time finishes (be not the while gating, but send into DSP unit 36 successively); The data of gating first via accumulator 33a only when the 3rd symbol time finishes; The data of difference gating the one 33a, the 2nd 33b and Third Road 33c accumulator when the 4th symbol time finishes, the rest may be inferred.
DSP unit 36 (or hardware circuit of other type) obtains symbol output separately to being handled respectively and adjudicated by the data that No. three accumulators come through latching and control gating unit 35, judges that then which symbol is correct, and with its output.
Latch and control gating unit 35 and DSP unit 36 all outputs a control signal to feedback information generation unit 26.Feedback information generation unit 26 produces feedback information and is multiplexed in the reverse traffic channel frame after the receiving circuit of travelling carriage receives the continuous effective frame.Feedback information generation unit 26 is worked according to following mode: if the valid frame that receives is to use the data of first via accumulator 33a, feedback information is changed to " 01 " so; If use first via accumulator 33a data can not solve correct information, and use the data of No. the second accumulator 33b can receive valid frame, feedback information is changed to " 10 " so; In like manner, if use the data of Third Road accumulator 33c just can receive valid frame, feedback information is changed to " 11 ".If the way of accumulator more than three, can use three or more multidigit represent.
Output to after feedback information produces in the CDMA data generation unit 27 among Fig. 2, be multiplexed in the reverse traffic channel frame.For example in IS-95, travelling carriage to base station reverse traffic channel prefix, is made up of 196 " 0 " after receiving continuous two valid frames, and this is in order to allow the base station confirm the foundation of reverse traffic link.Also can launch the reverse traffic channel frame that other have certain feature.Suppose that herein travelling carriage launches this reverse traffic channel prefix and give the base station, the feedback information of the inventive method can adopt following method to be multiplexed in the reverse traffic channel prefix: if feedback information is two, the last 8 bits of reverse traffic channel prefix is used for transmitting feedback information so, and, can correctly receive to guarantee the base station with this information triplicate; If feedback information is more than three or three, the bit number that can change number of repetition neatly or occupy so.Other has the frame of certain feature if travelling carriage is emission, and feedback information also can be multiplexed into wherein with similar method, does not still break away from the category of the inventive method.
As shown in Figure 1, after base station receiver demodulates feedback information, the feedback information of travelling carriage is input to power control unit 12, and power control unit 12 calculates when transmitting regular traffic the base station to the transmitting power of this travelling carriage according to current base station to the transmitting power of this travelling carriage and the feedback information that receives.Transmitting power when power control unit 12 calculates the conversation beginning according to following formula:
P=f·2
n-1·P
0 (2)
Wherein, P
0Be the current transmit power of base station to this travelling carriage; N is the feedback information of travelling carriage, represents the DSP in the mobile station receiver to use the data of n road accumulator can make correct judgement; F is a decay factor.Why be multiplied by a decay factor and be because can constantly increase transmitting power (frame once) during the blank traffic channel frame of base station, till catching reverse traffic channel, so from travelling carriage receive the continuous effective frame and begin to launch the reverse traffic channel prefix catches travelling carriage to the base station reverse traffic channel during this period of time in the growth of base station transmitting power all be unnecessary, decay factor f is exactly in order to prevent that base station transmitting power from increasing De Taigao.
Decay factor can be caught the step-length that average time of travelling carriage reverse traffic channel and base station power increase according to the base station and be determined.For example in IS-95, because the effect of reverse power control, the reverse traffic channel of travelling carriage can just be caught by the base station when emission first frame usually, and the base station is the power of a step-length of time increase of each frame, if it is 0.5dB that the base station increases the step-length of power, the unnecessary power that increased in the time of this frame that receives reverse traffic channel of base station is 0.5dB so, therefore when calculating the normal talking power demand, should deduct this 0.5dB, be equivalent to be multiplied by decay factor 0.89.In other system, the step-length of this capture time and flash-up is different, and the value of decay factor is also different, but its principle does not break away from the category of the inventive method.
More than first kind of embodiment of the inventive method is described.Introduce second embodiment of the inventive method below.
In second embodiment of the inventive method, the processing procedure of base station is the same with first embodiment, and the power of launching first blank frame is that current all users' average power is multiplied by a decay, progressively increases then.In the reception processing procedure of travelling carriage, adopted another way of realization to carry out the merging of symbol.
With reference to Fig. 3, can in DSP unit 36, realize with software to the stack of a plurality of modulation symbols.As shown in Figure 4,36 pairs two and four symbols in DSP unit merge the flow chart of processing, and its step is as follows:
(1) data X is by latch input store A, and with counter the data of input counted n;
(2) when data of input, check the counting n of counter, and judge;
(3) if n=3, the data that add new input so have four data with regard to one, at this moment carry out the merging of 4 data: M1+M2+M3+A, in addition two up-to-date data are merged: M3+A, data after the merging are sent into judgement respectively, also up-to-date data are sent to simultaneously and adjudicated, and the counting n of counter is reset to zero.Here M1, M2 and M3 are buffer memorys, and commentaries on classics (7);
(4) if n is not equal to 3, promptly there are not four up-to-date data, judge then whether n equals 1, and whether the data of two up-to-date symbols have promptly been arranged;
(5), just have it is merged if n equals 1: M3+A, the data after the merging are sent to judgement, up-to-date data are sent to adjudicated simultaneously, and n adds 1 with counter, and commentaries on classics (7);
(6) if n also is not equal to one, so directly the data A that will newly come in sends to and adjudicates, and counter n is added 1;
(7) upgrade buffer memory, prepare to receive next data and handle.
As seen, the handling process of Fig. 4 has been finished among Fig. 3 the function of three accumulators and control gating, expense that can economize on hardware.
Behind the concurrent sentencing, it is that judgement had obtained correct result after which merged that DSP unit 36 sends feedback information generation unit 26 to.After travelling carriage correctly received the continuous effective frame, feedback information generation unit 26 produced one as the said base station that feeds back among first embodiment.When the base station receives behind the feedback information of travelling carriage and to calculate normal talking according to formula (2) to the transmitting power of this travelling carriage.
Among second embodiment of the inventive method, travelling carriage has adopted the method that is different from first embodiment to the merging of duplicate message, is to the direct addition of the data after adding up, and realizes with software.Can certainly realize so a kind of stack with other hardware circuits, still not break away from the category of the inventive method.
So far set forth the present invention with reference to specific embodiment, but the invention is not restricted to these embodiment.Be appreciated that those skilled in the art can revise or improve the present invention under the situation that does not break away from the scope of the invention and spirit.
Claims (10)
1. the control method of base station transmitting power in the code division multiple access system, it is characterized in that, may further comprise the steps: transmitting power with the travelling carriage emission characteristic frame of predetermined Initial Trans to access phase, and is progressively strengthened in (1) base station on forward traffic channel; (2) travelling carriage carries out overlap-add procedure to the feature frame that receives, and the feature frame after handling is detected; (3) travelling carriage produces feedback information according to the testing result to the feature frame, and this feedback information is multiplexed into travelling carriage in the reverse traffic channel frame that the base station sends; (4) base station calculates transmitting power (P) required when this travelling carriage is transmitted regular traffic according to the current transmitting power to this travelling carriage of described feedback information and base station that receives.
2. the control method of base station transmitting power in the code division multiple access system according to claim 1, it is characterized in that, in the described step (1), described predetermined Initial Trans is that the average transmit power with current all users multiply by a decay factor and draws.
3. the control method of base station transmitting power in the code division multiple access system according to claim 2, it is characterized in that, in the described step (1), described decay factor is the ratio by the resulting symbol energy that has reduced of stack chip required symbol energy when not adopting the chip stack.
4. the control method of base station transmitting power in the code division multiple access system according to claim 1, it is characterized in that, in the described step (1), the transmitting power of base station is to increase with a step-length of setting according to the mode of log-linear, catches the reverse traffic channel of travelling carriage up to the base station.
5. the control method of base station transmitting power in the code division multiple access system according to claim 1, it is characterized in that, in the described step (2), by the accumulator that in the receiving system of travelling carriage, uses n road (n＞1) concurrent working and integration scavenging period to prolong, come the feature frame of the base station that receives is carried out overlap-add procedure with the method for prolongation time of integration.
6. the control method of base station transmitting power in the code division multiple access system according to claim 1, it is characterized in that, in the described step (2), in the DSP unit of the receiving system by travelling carriage the data that receive are stored, count, merged, under the control of software, come the feature frame of the base station that receives is carried out overlap-add procedure.
7. the control method of base station transmitting power in the code division multiple access system according to claim 1, it is characterized in that, in the described step (3), multiplexing can the employing of described feedback information is multiplexed into the method for travelling carriage in the prefix of the reverse traffic channel frame of base station transmission with this feedback information.
8. the control method of base station transmitting power is characterized in that in the code division multiple access system according to claim 1, and in the described step (4), the base station to the computing formula of the transmitting power of travelling carriage is: P=f2
N-1P
0
Wherein, P
0Be the current transmit power of base station to this travelling carriage; On behalf of the DSP unit in the mobile station receiver, n be to use n road accumulator and make correct judgement; F is a decay factor.
9. a device of realizing the control method of base station transmitting power in the described code division multiple access system of claim 1 comprises base station transmitting/receiving device and travelling carriage R-T unit; Wherein, the travelling carriage R-T unit comprises demodulation despread unit, feedback information generation unit (26), CDMA data generation unit (27) and reflector (28); It is characterized in that the digital demodulation despread unit of described travelling carriage comprises the n road accumulator (n is greater than 1) that parallel setting and integration scavenging period prolong, and latchs and control gating unit (35) and DSP unit (36); The data that travelling carriage receives are imported described n road accumulator simultaneously, and the output of described n road accumulator enters DSP unit (36) through latching and control gating unit (35) respectively; Latch and control gating unit (35) and DSP unit (36) all output a control signal to feedback information generation unit (26); The feedback information that feedback information generation unit (26) produces is admitted to CDMA data generation unit (27), sends to the base station by reflector (28) then.
10. the device of the control method of base station transmitting power in the code division multiple access system according to claim 9, it is characterized in that, in the n road accumulator of described travelling carriage, the integration scavenging period of No. the second accumulator (33b) by the integration scavenging period of first via accumulator (33a) through 1/2 frequency divider (34a
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| CNB991162935A CN1135018C (en) | 1999-07-16 | 1999-07-16 | Method and device for controlling transmitting power of base station in CDMA system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991162935A CN1135018C (en) | 1999-07-16 | 1999-07-16 | Method and device for controlling transmitting power of base station in CDMA system |
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| CN1281323A true CN1281323A (en) | 2001-01-24 |
| CN1135018C CN1135018C (en) | 2004-01-14 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100393171C (en) * | 2005-05-10 | 2008-06-04 | 上海贝尔三星移动通信有限公司 | Method and equipment for raising call completing rate in code division multiple access mobile communication system |
| CN100454799C (en) * | 2002-10-16 | 2009-01-21 | 华为技术有限公司 | Power controlling method for CDMA communication system |
| CN101032098B (en) * | 2005-07-25 | 2011-11-23 | 索尼株式会社 | Communication apparatus and method |
| CN1846366B (en) * | 2003-07-10 | 2012-10-10 | 艾利森电话股份有限公司 | Secondary link power control in a wireless communication network |
| CN102917452A (en) * | 2011-08-02 | 2013-02-06 | 中兴通讯股份有限公司 | Method and device for power control in access stage |
-
1999
- 1999-07-16 CN CNB991162935A patent/CN1135018C/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100454799C (en) * | 2002-10-16 | 2009-01-21 | 华为技术有限公司 | Power controlling method for CDMA communication system |
| CN1846366B (en) * | 2003-07-10 | 2012-10-10 | 艾利森电话股份有限公司 | Secondary link power control in a wireless communication network |
| CN100393171C (en) * | 2005-05-10 | 2008-06-04 | 上海贝尔三星移动通信有限公司 | Method and equipment for raising call completing rate in code division multiple access mobile communication system |
| CN101032098B (en) * | 2005-07-25 | 2011-11-23 | 索尼株式会社 | Communication apparatus and method |
| CN102917452A (en) * | 2011-08-02 | 2013-02-06 | 中兴通讯股份有限公司 | Method and device for power control in access stage |
| CN102917452B (en) * | 2011-08-02 | 2018-01-09 | 中兴通讯股份有限公司 | Access phase Poewr control method and device |
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| CN1135018C (en) | 2004-01-14 |
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