CN102026353B - Outer-loop power control method - Google Patents
Outer-loop power control method Download PDFInfo
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- CN102026353B CN102026353B CN 200910093895 CN200910093895A CN102026353B CN 102026353 B CN102026353 B CN 102026353B CN 200910093895 CN200910093895 CN 200910093895 CN 200910093895 A CN200910093895 A CN 200910093895A CN 102026353 B CN102026353 B CN 102026353B
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Abstract
The present invention discloses an outer-loop power control method comprising presetting the duration of the adjustment period and the target block error ratio (BLER)of outer-loop power control; calculating, on the real-time basis, the number of accumulated absolute error blocks of transmission data blocks during the current outer-loop power control adjustment period, and directly up-regulating the target value of signal to interference ratio (SIR Target) and ending the current outer-loop power control adjustment period and starting the next outer-loop power control adjustment period if the number of accumulated absolute error blocks is greater than the preset direct up-regulation threshold; calculating the BLER mean value within the outer-loop power control adjustment period when any outer-loop power control adjustment period reaches to the duration and adjusting SIR Target based on the BLER mean value and preset target BLER. SIR Target can be adjusted in time and the convergence speed thereof can be improved through the method disclosed in the invention.
Description
Technical field
The present invention relates to the Poewr control method in the communication system, particularly a kind of external circule power control method.
Background technology
In time division multiplexing-S-CDMA—Synchronous Code Division Multiple Access access (TD-SCDMA) system, open Loop Power control is used for determining user's Initial Trans, close-loop power control is by the measurement estimation of signal interference ratio (SIR) and the contrast of signal interference ratio desired value (SIR Target), regulate the size of transmitting power, finish the main process of power control.
Under different multi-path environments, the SIR Target that is used for closed-loop power control changes, need to adjust the SIR Target of inner-loop power control according to the Block Error Rate (BLER) that receives signal, thereby make system can satisfy all the time the requirement of communication quality with minimum power.The process of adjusting SIR Target according to the BLER that receives signal is the external circule power control process.
The basic ideas of outer-loop power controlling method are the BLER of each transmission channel of monitoring, according to predefined BLER desired value, adjust the sir target value, so that the BLER that obtains approaches predefined BLER desired value.
Existing external circule power control method is generally fixed step size fixed cycle pattern, in the external circule power control adjustment cycle of determining, according to the BLER statistical value, adopts default really fixed step size to adjust SIR Target.This external circule power control method, owing to SIR Target is adopted the adjustment mode of periodicity, fixed step size, (comprise the burst deep fade for the BLER scene that skyrockets, such as corner etc. and interference burst scene, such as same frequency interference area of switch area etc.), if external circule power control adjustment cycle process can not realize that then SIR Target adjusts timely, and can cause the SIR Target convergence ratio after the open loop slower.
For Wideband Code Division Multiple Access (WCDMA) access (WCDMA) system, its inner-loop power control frequency is very high, be 1500Hz, so the cycle of WCDMA external circule power control is very short, also adjust untimely problem with regard to above-mentioned outer shroud not occurring, yet for the TD-SCDMA system, its inner-loop power control frequency ratio is lower, only be 200Hz, so the external circule power control cycle can not be too short, therefore certainly exist above-mentioned SIR Target and adjust the untimely and slow problem of convergence rate.
Summary of the invention
In view of this, the invention provides a kind of external circule power control method, can in time adjust SIR Target, improve its convergence rate.
For achieving the above object, the present invention adopts following technical scheme:
A kind of external circule power control method comprises:
Preset the target block error rate BLER of lasting duration and the external circule power control of external circule power control adjustment cycle;
The absolute erroneous block number of accumulative total of transmission data block in the current external circule power control adjustment cycle of real-time statistics, if the absolute erroneous block number of described accumulative total is greater than default direct rise thresholding, then directly raise the desired value SIR Target of signal interference ratio, and finish current external circule power control adjustment cycle, start next external circule power control adjustment cycle;
After arbitrary external circule power control adjustment cycle arrives described lasting duration, calculate the BLER average in this external circule power control adjustment cycle, according to described BLER average and default described target BLER, adjust SIRTarget.
Preferably, when directly raising SIR Target, whether judge in the upper external circule power control adjustment cycle for directly raising SIR Target, if then when this raised SIR Target, SIR Target raised the basis increase rise step-length of step-length in last time; Otherwise the maximum that tone pitch is set to preset on this SIR Target raises step-length.
Preferably, when last time, SIR Target raised the basis increase rise step-length of step-length, the rise step-length of increase raised step-length for default maximum.
Preferably, when directly raising SIR Target, raise step-length with default maximum and adjust SIR Target.
Preferably, after calculating described BLER average, adjust SIR Target before, the method further comprises:
The continuous value of statistics BLER average is 0% external circule power control adjustment cycle number; If the continuous value of described BLER average be 0% external circule power control adjustment cycle number greater than default direct downward modulation thresholding, then directly reduce SIR Target; Otherwise, carry out the operation of described adjustment SIR Target.
Preferably, when directly reducing SIR Target, whether judge in the upper external circule power control adjustment cycle for directly reducing SIR Target, if then when this downward modulation SIR Target, increase the downward modulation step-length on the basis of SIR Target downward modulation last time step-length; Otherwise, the maximum downward modulation step-length that tone pitch is set to preset under this SIR Target.
Preferably, when increasing the downward modulation step-length on the basis of SIR Target downward modulation last time step-length, the downward modulation step-length of increase is default maximum downward modulation step-length.
Preferably, when directly reducing SIR Target, adjust SIRTarget with default maximum downward modulation step-length.
As seen from the above technical solution, among the present invention, when the absolute erroneous block number of accumulative total of transmission data block in the external circule power control adjustment cycle of real-time statistics when directly raising thresholding, directly raise SIR Target, and finish this external circule power control adjustment cycle, start next adjustment cycle.Like this, when SIR Target is low, can wait until that the external circule power control adjustment cycle finishes, and frequently raise operation, thereby improve rapidly SIR Target, make its requirement of satisfying as early as possible system transmissions, reach timely adjustment SIR Target, improve the purpose of its convergence rate.
Description of drawings
Fig. 1 is the particular flow sheet of embodiment of the invention outer-loop circule power control method.
Embodiment
For making purpose of the present invention, technological means and advantage clearer, below in conjunction with accompanying drawing the present invention is described in further details.
Among the present invention, the most basically, when, SIR Target relatively poor when the system transmissions environment is low, shorten the rise cycle of SIR Target, SIR Target is carried out rapid lifting, thereby guarantee the promptness of adjustment, make user's signal transmission performance reach system requirements.
Simultaneously, because the downward modulation of SIR Target may cause the subscriber signal transmission performance to descend, even produce call drop, the problem such as disconnect, therefore, it is more careful to need for the downward modulation of SIR Target, based on this, among the present invention in the most basic adjustment mode, downward modulation for SIR Target does not change, and still keeps existing implementation.
And in further improved plan, when determining that according to condition current SIR Target is in higher level really, can consider the downward modulation of SIR Target is adjusted, with the downward modulation of quickening SIR Target, thus the promptness that assurance is adjusted.
Next, by specific embodiment, the preferred embodiments among the present invention is elaborated.
Fig. 1 is the particular flow sheet of embodiment of the invention outer-loop circule power control method.As shown in Figure 1, the method comprises:
The parameter that specifically needs to set comprises:
1.SIR Target UP Max Value: SIR Target, adjustment amount on the SIR Target maximum in the cycle adjustment process are raised in maximum single step.
2.SIR Target Down Max Value: maximum single step downward modulation SIR Target, the cycle is adjusted
Adjustment amount under the SIR Target maximum in the process.
3.SIR Target UP Step:SIR Target raises base quantity.
4.SIR Target Down Step:SIR Target reduces base quantity
5.PERIOD_OLPC: the lasting duration of external circule power control adjustment cycle
6.MAX_ERR_TB_NUM: directly raise thresholding, absolute erroneous block number maximum under the expression normal cycle adjustment modes
7.BLER_Good_Max: directly reduce thresholding, the continuous value of BLER is zero cycle times maximum
Wherein, the setting of parameter 1～5 is identical with existing mode.The setting of directly raising thresholding and direct downward modulation thresholding will be explained below.
Wherein, the statistics of the absolute erroneous block number of accumulative total and is identical for carrying out the erroneous block number statistics that the BLER mean value computation carries out in the existing external circule power control method.
For in time carrying out the adjustment of SIR Target, among the present invention, in the external circule power control adjustment cycle, the absolute erroneous block number of accumulative total of statistics is monitored, and compare with the direct rise thresholding of presetting.When the absolute erroneous block number of accumulative total when directly raising thresholding, then judge in advance and think that current SIR Target is lower, do not need to wait until that current external circule power control adjustment cycle arrives continues duration, and the rise of directly carrying out SIR Target by step 104 operates.
If the absolute erroneous block number of accumulative total in the current external circule power control adjustment cycle, all the time less than default direct rise thresholding, then employing cycle adjustment mechanism is adjusted SIR Target, thus the stationarity that assurance is adjusted.
Wherein, setting about direct rise thresholding, as previously mentioned, should directly raise the maximum that thresholding is the absolute erroneous block number of accumulative total of permission in the external circule power control adjustment cycle, therefore, this peaked setting should be relevant with the data block total number of target BLER and transmission, and the data block total number of transmission is relevant with PERIOD_OLPC and user's type of service, therefore, directly raising thresholding need to carry out according to PERIOD_OLPC, user's type of service and target BLER.
For example, suppose that PERIOD_OLPC is 200ms, target BLER is 1%, and it is 1000 according to the data block total number that the customer service type inference transmits in 200ms, estimate then that in the lasting duration of external circule power control adjustment cycle according to target BLER, the erroneous block of permission adds up to 10; Exist SIR Target directly to raise the abrupt change scene that is generally transmission environment of demand among the present invention, under this scene, need to shorten SIR Target and raise the cycle, rapid lifting SIR Target, therefore can directly raise thresholding is set on certain-length greater than the erroneous block sum of estimating, for example be set to the N (N＞1) of this erroneous block sum of estimating doubly, be set to 40 in the present embodiment, thereby can distinguish abrupt change scene and the gradual change scene of transmission channel.
When judging that by step 103 need to carry out SIR Target directly goes up timing, directly raise SIR Target value by this step, and after waiting until that no longer the external circule power control adjustment cycle arrives lasting duration, the existing mode of recycling is carried out the adjustment of SIR Target according to the BLER value.And, carry out again namely finishing current external circule power control adjustment cycle after SIR Target directly raises, start next external circule power control adjustment cycle, the wrong absolute mistake piece number of the accumulative total of this cycle statistics is carried out zero clearing.That is to say, in case after carrying out directly rise operation, namely represent this external circule power control adjustment cycle and finish, therefore, the duration of this external circule power control adjustment cycle is shorter than default PERIOD_OLPC, has realized the timely adjustment of SIR Target, also makes the adjustment of SIRTarget become the variable period adjustment; At next external circule power control adjustment cycle, all restart, and return step 102.
Wherein, this step is timing on SIR Target being carried out directly, the most simply, can directly raise SIR Target with default maximum single step and adjust; Perhaps, preferably, can also further carry out accommodation to raising step-length, satisfy under the certain condition, strengthen and raise step-length, improve the validity of adjusting.
The implementation that step-length is raised in a kind of real-time adjustment that the present invention provides is: when directly raising SIRTarget, whether judge in the upper external circule power control adjustment cycle for directly raising SIR Target, if, then when this raised SIR Target, SIR Target raised the basis increase rise step-length of step-length in last time; Otherwise the maximum that tone pitch is set to preset on this SIR Target raises step-length SIRTarget UP Max Value.
Direct rise marker bit can be set during specific implementation, and it is initialized as " vacation ", after carrying out SIR Target adjustment, directly raise the renewal of marker bit at every turn; If this carries out the direct rise of SIR Target, then will directly raise marker bit and be updated to "True"; If it is not directly to raise SIR Target that the SIR Target that this carries out adjusts, then will directly raises marker bit and be updated to " vacation ".In this step, after determining that carrying out SIR Target directly raises, judge whether current direct rise marker bit (the direct rise marker bit of this moment not yet upgrades according to the adjustment of this adjustment cycle) is "True", if, then show and situation about exceeding standard less than the absolute erroneous block number of the accumulative total under the adjustment cycle in last adjustment cycle, occurred, then increase on the basis of SIR Target rise last time step-length and raise step-length, for example this SIR Target can be raised step-length and be made as: SIR Target UP Value_Now=SIR TargetUP Value_last (last time, SIR Target raised step-length)+SIR Target UP Max Value; Otherwise, show situation about exceeding standard less than the absolute erroneous block number of the accumulative total under the adjustment cycle in last adjustment cycle, not occur that then this SIR Target raises step-length and is set to SIR Target UP Max Value.
In this step, the mode of calculating the BLER average is identical with existing mode.For determining whether target SIR Target needs directly to reduce, to accelerate downward modulation speed, need to carry out mark to continuing good channel circumstance, be that 0% situation is carried out record to continuous BLER value.
Specific implementation can for: set in advance the BLER_GOOD counter, be used for to preserve the continuous value of BLER and be 0% external circule power control adjustment cycle number.If when the BLER average that this step calculates is 0%, then the BLER_GOOD counter is added 1; Otherwise, with the BLER_GOOD counter O reset.
When continuous value when being 0% external circule power control adjustment cycle number greater than default direct downward modulation thresholding, be that the BLER_GOOD counter is greater than default direct downward modulation thresholding, then show in continuous a plurality of external circule power control adjustment cycle, the BLER average is 0%, it is good that channel circumstance keeps continuously, and think that SIRTarget is too high this moment.
Wherein, for the setting of direct downward modulation thresholding, carry out according to target BLER, SIR Target downward modulation base quantity SIR Target Down Step and type of service.Wherein, target BLER is larger, shows that then current transmission performance is better with respect to the object transmission performance, and it is less then directly to reduce threshold value, with the promptness that guarantees to adjust; SIR Target Down Step is less, shows according to normal adjustment, and the speed of object transmission performance of leveling off to is slower, and it is less then directly to reduce thresholding; Type of service is then directly related with transmission performance, therefore it need to be considered therein.
When judging that by step 106 need to carry out SIR Target directly descends timing, directly reduces SIR Target value by this step.As previously mentioned, because it is very careful that the downward modulation of SIR Target needs, therefore the form that just can carry out less than the external circule power control adjustment cycle is not taked in the direct downward modulation of this SIR Target, but after the external circule power control adjustment cycle reaches default lasting duration PERIOD_OLPC, just carries out.
Although the length of external circule power control adjustment cycle does not change, for guaranteeing the promptness of downward modulation, the downward modulation step-length of SIR Target is adjusted.The most simply, can carry out directly descending timing, all with default maximum single step downward modulation SIR Target, namely SIR Target Down Max Value adjusts at every turn; Perhaps, preferably, can also further satisfy under the certain condition, strengthen the downward modulation step-length, improve the validity of adjusting.
The implementation of a kind of real-time adjustment downward modulation step-length that the present invention provides is: when directly reducing SIRTarget, whether judge in the upper external circule power control adjustment cycle for directly reducing SIR Target, if, then when this downward modulation SIR Target, increase the downward modulation step-length on the basis of SIR Target downward modulation last time step-length; Otherwise, the maximum downward modulation step-length that tone pitch is set to preset under this SIR Target.
Direct downward modulation marker bit can be set during specific implementation, and it is initialized as " vacation ", after carrying out SIR Target adjustment, directly raise the renewal of marker bit at every turn; If this carries out the direct downward modulation of SIR Target, then will directly raise marker bit and be updated to "True"; If it is not directly to reduce SIR Target that the SIR Target that this carries out adjusts, then will directly reduces marker bit and be updated to " vacation ".In this step, after determining that carrying out SIR Target directly reduces, judge whether current direct downward modulation marker bit (the direct downward modulation marker bit of this moment not yet upgrades according to the adjustment of this adjustment cycle) is "True", if, the situation that has occurred BLER=0% in continuous a plurality of adjustment cycle before then showing, be that all extraordinary situations of continuous several times appear in BLER, then increase the downward modulation step-length on the basis of SIR Target downward modulation last time step-length, for example this SIR Target downward modulation step-length can be made as: SIR Target DownValue_Now=SIR Target Down Value_last (SIR Target downward modulation last time step-length)+SIRTarget Down Max Value; Otherwise, show in the situation that a plurality of continuous setup BLER=0% in the cycle do not occur before, be that all extraordinary situations of continuous several times also do not appear in BLER, do not need to increase maximum downward modulation step-length, then this SIR Target downward modulation step-length is set to SIR Target Down MaxValue.
The processing of this step is identical with existing mode, namely at first calculates
If result of calculation greater than 0, then raises SIR Target
If result of calculation less than 0, is then reduced SIR Target
Wherein, the adjusting range of rise is no more than SIR Target UP Max Value, and the adjusting range of downward modulation is no more than SIR Target Down Max Value.
So far, finish the adjustment of an external circule power control.After carrying out the external circule power control adjustment, this SIR Target adjustment amount of determining as SIR Target adjustment amount last time, is used for external circule power control next time at every turn.
In above-mentioned flow process shown in Figure 1, preferred embodiments of the present invention is had been described in detail.Wherein, all revise for the upper mediation downward modulation mode of SIR Target.As previously mentioned, because the downward modulation to SIR Target need to be very careful, therefore, can the downward modulation mode of SIR Target be remained unchanged, then in above-mentioned flow process shown in Figure 1, step 105 calculates after the BLER average directly execution in step 108, carries out SIR Target according to existing mode and adjusts.
By the specific implementation of the invention described above as seen, the most basically, the present invention is by raising the adjustment of cycle and rise step-length to SIR Target, realized under the BLER abrupt change scene, in time carry out the rapid raising of SIR Target, improved the convergence rate of SIR Target in the SIR Target situation on the low side.
Simultaneously, further, by the further adjustment to SIR Target downward modulation step-length, realized under the BLER abrupt change scene, the rapid reduction of SIR Target, and the condition of SIR Target downward modulation is accelerated in strict control, under the prerequisite that improves SIR Target convergence rate, guarantees can not occur that transmission performance significantly is lower than the system requirements performance and the phenomenon that causes call drop etc.
Being preferred embodiment of the present invention only below, is not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. external circule power control method is characterized in that the method comprises:
Preset the target block error rate BLER of lasting duration and the external circule power control of external circule power control adjustment cycle;
The absolute erroneous block number of accumulative total of transmission data block in the current external circule power control adjustment cycle of real-time statistics, if the absolute erroneous block number of described accumulative total is greater than default direct rise thresholding, then directly raise the desired value SIR Target of signal interference ratio, and finish current external circule power control adjustment cycle, start next external circule power control adjustment cycle;
After arbitrary external circule power control adjustment cycle arrives described lasting duration, calculate the BLER average in this external circule power control adjustment cycle, the continuous value of statistics BLER average is 0% external circule power control adjustment cycle number; If the continuous value of described BLER average be 0% external circule power control adjustment cycle number greater than default direct downward modulation thresholding, then directly reduce SIR Target; Otherwise, according to described BLER average and default described target BLER, adjust SIR Target.
2. method according to claim 1, it is characterized in that, when directly raising SIR Target, whether judge in the upper external circule power control adjustment cycle for directly raising SIR Target, if, then when this raised SIR Target, SIR Target raised the basis increase rise step-length of step-length in last time; Otherwise the maximum that tone pitch is set to preset on this SIR Target raises step-length.
3. method according to claim 2 is characterized in that, when last time, SIR Target raised the basis increase rise step-length of step-length, the rise step-length of increase raised step-length for default maximum.
4. method according to claim 1 is characterized in that, when directly raising SIR Target, raises step-length with default maximum and adjusts SIR Target.
5. method according to claim 1, when direct downward modulation SIR Target, whether judge in the upper external circule power control adjustment cycle for directly reducing SIR Target, if, then when this downward modulation SIR Target, increase the downward modulation step-length on the basis of SIR Target downward modulation last time step-length; Otherwise, the maximum downward modulation step-length that tone pitch is set to preset under this SIR Target.
6. method according to claim 5 is characterized in that, when increasing the downward modulation step-length on the basis of SIR Target downward modulation last time step-length, the downward modulation step-length of increase is default maximum downward modulation step-length.
7. method according to claim 1 is characterized in that, when directly reducing SIR Target, adjusts SIR Target with default maximum downward modulation step-length.
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| CN103002556B (en) * | 2011-09-13 | 2015-07-22 | 中磊电子（苏州）有限公司 | Power control method and radio network controller |
| CN102802248B (en) * | 2012-08-13 | 2015-08-05 | 天津三星通信技术研究有限公司 | Outer-loop power controlling method and equipment |
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| CN1773884A (en) * | 2004-11-08 | 2006-05-17 | 大唐移动通信设备有限公司 | Transmitting power controlling method for realizing target signal noise ratio fast convergence |
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| CN101170326A (en) * | 2006-10-25 | 2008-04-30 | 大唐移动通信设备有限公司 | An outside ring power control method and system |
| CN101437282A (en) * | 2008-12-19 | 2009-05-20 | 普天信息技术研究院有限公司 | Method and apparatus for controlling external loop power of combined business |
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| US7330504B2 (en) * | 2002-11-25 | 2008-02-12 | Texas Instruments Incorporated | Method and apparatus for low power-rise power control using sliding-window-weighted QoS measurements |
| CN1773884A (en) * | 2004-11-08 | 2006-05-17 | 大唐移动通信设备有限公司 | Transmitting power controlling method for realizing target signal noise ratio fast convergence |
| CN101170326A (en) * | 2006-10-25 | 2008-04-30 | 大唐移动通信设备有限公司 | An outside ring power control method and system |
| CN101437282A (en) * | 2008-12-19 | 2009-05-20 | 普天信息技术研究院有限公司 | Method and apparatus for controlling external loop power of combined business |
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