CN100518004C - Length variable power control method in CDMA communication system - Google Patents
Length variable power control method in CDMA communication system Download PDFInfo
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- CN100518004C CN100518004C CNB2005100681028A CN200510068102A CN100518004C CN 100518004 C CN100518004 C CN 100518004C CN B2005100681028 A CNB2005100681028 A CN B2005100681028A CN 200510068102 A CN200510068102 A CN 200510068102A CN 100518004 C CN100518004 C CN 100518004C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The method thereof comprises: s1) the receiving end receives N power control bits; S2) recording the variation times of the power control bits and the power control bit length of what is continually '1'; S3) if the variation times of power control bits are more than a threshold A, the step length takes minimum step length, otherwise entering into step S4; S4) taking a maximum length value in which the power control bits is continually '1'from step S2; in term of the size of said maximum length value, determining the step length of power control. The invention can effectively trace the variation of radio ambient in order to compensate a fading of channel.
Description
Technical field
The present invention relates to a kind of variable step Poewr control method, relate in particular to the variable step Poewr control method of a kind of code division multiple access (CodeDivision Multiple Access) (hereinafter to be referred as CDMA) mobile communication system.
Background technology
In CDMA mobile communication system, adopt forward power control and Uplink Power Control Technology, their purpose all is to make transmitting power as far as possible little satisfying under the minimum signal to noise ratio demand of receiver demodulation.For the violent mobile communication system of wireless environment variation, in order to reach this purpose, require power control techniques can follow the tracks of the various declines of wireless channel, remedy the decline of channel ground in time, guarantee communication quality and do not waste transmitting power.
The forward power control algolithm is carried out at mobile station side.Travelling carriage is according to the signal to noise ratio of certain period measurement forward traffic channel, and this measured value is compared with target signal to noise ratio.The signal to noise ratio that obtains when test is during less than target signal to noise ratio, and travelling carriage is just put the forward power control bit and is " 1 ", requires the base station to improve the transmitting power of forward traffic channel.The signal to noise ratio that obtains when test is greater than target signal to noise ratio, and travelling carriage is just put the forward power control bit and is " 1 ", requires the base station to reduce the transmitting power of forward traffic channel.After the base station receives the forward power control bit, improve or reduce the transmitting power of forward traffic channel according to certain step-length.If the step-length of this lifting is unreasonable, then can causes the toning of power or slower power control convergence, thereby influence the stability of user's communications quality and system.Similarly, unreasonable if the reverse power control step-length is provided with, then can increase reverse interference or cause conversing interruption suddenly.So the variation that power control step-size should the automated response wireless environment improves the performance of power control.
The patent No. provides a kind of method that dynamically arranges power control step-size for the United States Patent (USP) of US6212399, and the base station receives N forward power control bit b
I-n+1... b
i, calculate these power control bits and absolute value, promptly
Adjust power control step-size according to this result then.There is a problem in this method, for example suppose that the power control bit that receives is respectively { 1-11-11-11-11-1 1-11-11-11-11-1} and { 1111111111-1-1-1-1-1-1-1-1-1-1}, they with absolute value be identical, so power control step-size is identical.In fact, if the forward power control bit that travelling carriage produces be that the length of " 1 " is greatly the time continuously, { 1111111111-1-1-1-1-1-1-1-1-1-1} illustrates that travelling carriage has suffered the deep fading, then should adopt high-power control step-length to overcome the influence that the deep fading brings as top; If in a period of time, forward power control bit " 1 " and " 1 " that travelling carriage produces are evenly distributed, and { 1-11-11-11-1 1-1 1-1 1-1 1-1 1-1 1-1} illustrates that wireless environment variation is smooth as top, then adopt the small-power step-length, avoid the toning of power.Therefore, said method can not be followed the tracks of the variation of wireless environment effectively, and power control step-size can't reasonably be set.
Summary of the invention
In view of the above problems, the object of the present invention is to provide the variable step Poewr control method in the CDMA mobile communication system, it mainly is the situation of change according to power control bit, and power control step-size dynamically is set, to improve the stability of user's communications quality and system.
Variable step Poewr control method in the CDMA mobile communication system of the present invention is characterized in that comprising the steps:
Step S1: receiving terminal receives N power control bit;
Step S2: number of times and power control bit that the recording power control bit changes are the length of " 1 " continuously;
Step S3: if the number of times of power control bit variation is greater than thresholding A among the step S2, then power control step-size is got minimum step STEP1; Otherwise, execution in step S4;
Step S4: get power control bit among the step S2 continuously for the maximum of the length of " 1 ", determine power control step-size according to the size of this value.
Wherein, when the receiving terminal among the above-mentioned steps S1 was travelling carriage, an above-mentioned N power control ratio was specially for the forward power control bit; When the receiving terminal among the above-mentioned steps S1 was the base station, an above-mentioned N power control ratio was specially for the reverse power control bit.The value of above-mentioned N can obtain by measuring, and its value is corresponding with base station and the residing actual landform of travelling carriage, and for example the N value of dense city is littler than the N value in suburb.The value of N should guarantee that N power control bit can reflect actual landform.
The span of thresholding A among the above-mentioned steps S3 exists
Between, when
When aliquant, then round up.The optimal value of this thresholding A can obtain by measuring, and should make that the frame error rate of above-mentioned receiving terminal is minimum.
Above-mentioned steps S4 comprises the steps:
Step S41: if power control bit be continuously the maximum of length of " 1 " less than thresholding N/4, then power control step-size is got the long STEP2 of small step; Otherwise execution in step S42;
Step S42: if power control bit be continuously the maximum of length of " 1 " greater than thresholding N/4, but less than thresholding N/2, then power control step-size is got vice-minister's step-length STEP3; Otherwise, execution in step S43;
Step S43: if power control bit be continuously the maximum of length of " 1 " greater than thresholding N/2, then power control step-size is got maximum step-length STEP4.
Wherein, the pass of above-mentioned step-length STEP1, STEP2, STEP3, STEP4 is STEP1＜STEP2＜STEP3＜STEP4.
In sum, method of the present invention can be followed the tracks of the variation of wireless environment effectively, thereby can remedy channel fading effectively, accelerates the convergence rate of power control, improves the stability of user's communications quality and system.
Below in conjunction with accompanying drawing, be described in further detail with the concrete enforcement of preferred embodiment to the method for the invention.For those skilled in the art that, from the detailed description to the inventive method, above-mentioned and other purposes of the present invention, feature and advantage will be apparent.
Description of drawings
Figure 1A and Figure 1B are the power control schematic diagrames of CDMA mobile communication system.
Fig. 2 is the general flow chart of the inventive method.
Fig. 3 is the flow chart of the step S4 in the inventive method.
Embodiment
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is described in detail.
Figure 1A and Figure 1B have provided the power control mode in the CDMA mobile communication system.Control for forward power, shown in Figure 1A, travelling carriage is determined the energy and the ratio (Energybit/Noise total) (hereinafter to be referred as Eb/Nt) that receives the overall noise on the broadband, per 1.25 milliseconds of Eb/Nt that measurement receives of the every bit of destinations traffic passage according to certain outer shroud algorithm; When the Eb/Nt that measures less than target Eb/Nt, travelling carriage is just put the forward power control bit and is " 1 " (expression rise); When the Eb/Nt that measures greater than target Eb/Nt, travelling carriage is just put the forward power control bit and is " 1 " (expression descend); After the base station receives the forward power control bit, improve or reduce the transmitting power of forward traffic channel according to certain step-length.For reverse power control, shown in Figure 1B, target Eb/Nt is determined according to certain outer shroud algorithm in the base station, per 1.25 milliseconds of Eb/Nt that measurement receives; When the Eb/Nt that measures less than target Eb/Nt, the base station is put the reverse power control bit and is " 1 " (expression rise); When the Eb/Nt that measures greater than target Eb/Nt, the base station is put the reverse power control bit and is " 1 " (expression descend); After travelling carriage receives the reverse power control bit, improve or reduce the transmitting power of reverse traffic channel according to certain step-length.
Fig. 2 is the general flow chart of the inventive method.At first, step 21 receiving terminal receives N power control bit, such as 12 power control ratios that receive specially for { 111100101100}.Then, the number of times and the power control bit of the variation of step 22 recording power control bit are the length of " 1 " continuously.In that { among the 111100101100}, the number of times that power control bit changes is 5 times, and power control bit is 4,1,2 for the length of " 1 " continuously.Step 23 judges that whether the number of times of power control bit variation is greater than thresholding A.Because the value of N is 12, the span of thresholding A is between (9,11), and we get thresholding A is 9.If it is more even that the number of times that power control bit changes, illustrates that power control bit " 1 " and " 1 " distribute greater than 9, then power control step-size is got minimum step STEP1.If the number of times that power control bit changes is less than 9, the number of times 5 that changes as power control bit in the present embodiment is less than the value 9 of thresholding A, then need to forward to step 25, determine power control step-size for the maximum of the length of " 1 " continuously according to power control bit, determination methods as shown in Figure 3.In that { among the 111100101100}, power control bit is 4 for the maximum of the length of " 1 " continuously.If judge the value of being somebody's turn to do less than thresholding 3 (N/4) according to the step 31 of Fig. 3, then power control step-size is got time long STEP2 of small step.Otherwise if judge and should be worth greater than thresholding 3 (N/4) according to step 32, but less than thresholding 6 (N/2), then power control step-size is got time big step-length STEP3.If judge and to be worth greater than thresholding 6 (N/2) that then power control step-size is got maximum step-length STEP4 according to step 34.Processing can be adopted less step-length for the length of " 1 " by the guaranteed output control bit continuously more in short-term like this, the guaranteed output control bit adopts big step-length when longer for the length of " 1 " continuously, thereby remedy channel fading in time, guarantee communication quality and do not waste transmitting power.
Though the present invention with preferred embodiment openly as above, the example of the visualization that this just lifts for the ease of understanding should not be considered to be limitation of the scope of the invention.Equally; the ordinary skill of technical field all can be according to the description of technical scheme of the present invention and preferred embodiment thereof under any; make various possible being equal to and change or replacement, but all these changes or replacement all should belong to the protection range of claim of the present invention.
Claims (7)
1, the variable step Poewr control method in a kind of CDMA mobile communication systems is characterized in that comprising the steps:
Step S1: receiving terminal receives N power control bit;
Step S2: the number of times that the recording power control bit changes, and power control bit is the length of " 1 " continuously;
Step S3: if the number of times of power control bit variation is greater than thresholding A among the step S2, then power control step-size is got minimum step STEP1; Otherwise, execution in step S4;
Step S4: get power control bit among the step S2 continuously for the maximum of the length of " 1 ", determine power control step-size according to the size of this value.
2, method according to claim 1 is characterized in that when the receiving terminal among the above-mentioned steps S1 is travelling carriage N power control ratio is specially for the forward power control bit.
3, method according to claim 1 is characterized in that when the receiving terminal among the above-mentioned steps S1 is the base station N power control ratio is specially for the reverse power control bit.
4,, it is characterized in that the value of above-mentioned N obtains by measuring, and its value is corresponding with base station and the residing actual landform of travelling carriage according to claim 2 or 3 described methods.
5, method according to claim 1 is characterized in that the span of the thresholding A among the above-mentioned steps S3 exists
Between, when
When aliquant, then round up.
6, method according to claim 5 is characterized in that the optimal value of above-mentioned thresholding A obtains by measuring, and makes that the frame error rate of above-mentioned receiving terminal is minimum.
7, method according to claim 1 is characterized in that above-mentioned steps S4 determines that the step of power control step-size is:
Step S41: if power control bit be continuously the maximum of length of " 1 " less than thresholding N/4, then power control step-size is got the long STEP2 of small step; Otherwise execution in step S42;
Step S42: if power control bit be continuously the maximum of length of " 1 " greater than thresholding N/4, but less than thresholding N/2, then power control step-size is got vice-minister's step-length STEP3; Otherwise, execution in step S43;
Step S43: if power control bit be continuously the maximum of length of " 1 " greater than thresholding N/2, then power control step-size is got maximum step-length STEP4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100681028A CN100518004C (en) | 2005-04-26 | 2005-04-26 | Length variable power control method in CDMA communication system |
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| CNB2005100681028A CN100518004C (en) | 2005-04-26 | 2005-04-26 | Length variable power control method in CDMA communication system |
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| CN1855755A CN1855755A (en) | 2006-11-01 |
| CN100518004C true CN100518004C (en) | 2009-07-22 |
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| CN102281618B (en) * | 2010-06-08 | 2014-11-05 | 上海中兴软件有限责任公司 | Method and device for power control |
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Non-Patent Citations (2)
| Title |
|---|
| Technical Specification Group Radio AccessNetwork,Physical layer procedures(FDD)(Release 5). 3rd，Generation，Partnership，Project.3GPP TS 25.214 V5.10.0. 2004 |
| Technical Specification Group Radio AccessNetwork,Physical layer procedures(FDD)(Release 5). 3rd，Generation，Partnership，Project.3GPP TS 25.214 V5.10.0. 2004 * |
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Granted publication date: 20090722 Termination date: 20190426 |