CN1595830A - A WCDMA system power control method - Google Patents
A WCDMA system power control method Download PDFInfo
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Abstract
The invention advances a WCDMA system power control method. Fast convergent outer-loop power quickly regulates SIRtarget according to the reported SIRerror; simultaneously as the difference value between actual measured SIR and SIRtarget_ave is not over threshold value, adopting normal outer-loop power control method-threshold report CRCI method. It assures fast convergence of power control by two-stage outer-loop power control, as the difference of the given SIRtarget from the actual measured SIR is very large, adopts high priority outer-loop power control algorithm to make the transmission service able to fast meet the requirement on service quality, and simultaneously as the difference between them is not very large, adopts threshold report CRCI method to tune the SIRtarget, so as to assure fast and accurate convergence of the actual SIR and its nature is to make service communication quality fast meet service quality. And according to different Qos grades of different services, it determines corresponding adjusting-down cycles and by the comparison of the current actual communication quality status, adopts self-L adapting step length adjusting method, also further fast converging the power control.
Description
Technical field
The present invention relates to the Poewr control method of WCDMA mobile communication system (WCDMA), relate to a kind of more precisely at the adopted key technology-Poewr control method of Wideband Code Division Multiple Access (WCDMA) communication system up link.
Background technology
The WCDMA system up-link is interference-limited, the transmitting power of other all user User Equipment (UE) all is to disturb concerning this travelling carriage, because travelling carriage is random distribution in the sub-district, the travelling carriage that has is distant from the base station, the travelling carriage that has is closer from the base station, and if all travelling carriages are all adopted identical transmitting power, the remote travelling carriage signal interference ratio that then receives in the base station is just very little, the error code that causes is just very big, has so just formed near-far interference; On the other hand, the wireless channel of mobile communication has a broadband dynamic frequency band, and these characteristics and mobile subscriber's character is relevant, and is subjected to Doppler's (Doppler) fading effect of Radio Link and the influence of Rayleigh (Rayleigh) decline usually.Under these circumstances, just need a rapid and precise power control, to guarantee quality of services for users (Qualityof Service-Qos)
The purpose of closed power control is in order to adjust the transmitting power of each travelling carriage, reduce the influence of this near-far interference, guarantee that as far as possible the power that the base station receives all travelling carriages all equates, simultaneously also can remedy the influence that Doppler frequency shift and Rayleigh fading are brought, thereby make each user can both satisfy the Qos of transport service, in 3GPP TS 25.214, provided the method for closed power control: for up link, at first signal interference ratio (Signal to InterferenceRatio-SIR=Eb/No) measurement is all carried out to the every wireless links that receives in the base station, compare with the required satisfied target signal interference ratio of business (Signal toInterference Ratio target-SIRtarget) then, if SIR 〉=SIRtarget, then sending to bit value of travelling carriage (UE) at descending control channel is 1 transmitting power control (Transmitted Power Control-TPC) order; If SIR＜SIRtarget, then sending to bit value of UE at descending control channel is 0 TPC order; UE judges it is to increase transmitting power or reduce transmitting power according to the power control algorithm of TPC order that receives and network layer appointment then.Yet along with the variation of mobile communication environment and the variation of translational speed, the signal interference ratio that the service needed of transmission satisfies also will change, and up SIRtarget is by the network side appointment, what initially the signal interference ratio of specified value and actual needs differed is many, these all need in the quality situation of exterior ring power control according to business SIRtarget to be adjusted, that is to say that exterior ring power control is the auxiliary of closed power control, being the foundation that transmitting power is adjusted in closed power control, is very important in power control module.
Borrow. the patent in the cloth, " improve the channel self-adapting fast power control in the code division multiple access ", publication number: CN 1270459A. considers for urban environment wireless channel attenuation change fast especially, so that because the delay that loop forms can not reflect real-time fading channel situation completely, when inner loop power is controlled, adopt different inner loop power control algolithms (abbreviating the TPC algorithm as), and provided the implementation procedure of this method from hardware according to different communication environment (urban district, suburb or rural area).The problem that can not in time follow the tracks of fading channel although this patent is considered the loop time-delay, and select different inner loop power control algolithms to solve this problem, but the standard of inner loop power control is the target signal interference ratio, yet may be because the speed of travelling carriage has taken place to change or variation has taken place other communication environment, and in order to satisfy professional required service quality, then its required target signal interference ratio also can change; If only consider that from the influence of selecting different inner loop power control methods to overcome channel fading be far from being enough, because for the very fast situation of user moving speed increase, its required target signal interference ratio can increase, if do not remove to adjust the target signal interference ratio, then its communication quality can become very poor, thereby can cause call drop; Change to the situation of low speed from high speed for user moving speed, its required target signal interference ratio can reduce, and if do not remove to reduce the target signal interference ratio this moment yet, then user's transmitting power will be required bigger than it, thereby make the interference between the user increase, finally influence the up-link capacity of sub-district
Summary of the invention
Based on the present limitation of Poewr control method and the state of the art that exterior ring power is controlled at the important function in the WCDMA communication system and controls about exterior ring power at present of having now, the present invention's consideration realizes the quick convergence of user emission power from outer-loop power controlling method.The index of estimating up-link power control quality is to make the transmitting power of travelling carriage converge to stable state as early as possible, just makes the business of transmission can satisfy Qos as soon as possible.
Purpose of the present invention proposes a kind of WCDMA system power control method exactly, realizes the quick convergence of user emission power.
The object of the present invention is achieved like this:
The invention discloses a kind of WCDMA system power control method, comprise the steps:
Step 1: the initial and initial uplink target signal interference ratio SIR that determines the user;
Step 2: start inner loop power control;
Step 3: start normal exterior ring power control;
Step 4: the triggering message that judges whether to receive signal interference ratio error SIRerror; If receive that then execution in step 5; Otherwise execution in step 9;
Step 5: hang up normal exterior ring power control, trigger the control of high priority exterior ring power;
Step 6: the return results sign of judging the control of high priority exterior ring power; If do not make the sign of exterior ring power control, then execution in step 7; Otherwise execution in step 8;
Step 7: start timer, waiting timer then starts normal exterior ring power control once more;
Step 8: the shielding cycle is set, overcomes the loop time-delay, so that when the normal exterior ring power of execution is controlled, in the shielding cycle, do not do mistake piece statistics;
Step 9: carry out the control of normal exterior ring power, and then the execution that moves in circles from step 4.
Described step 2 and step 3 start simultaneously.
Described normal exterior ring power control comprises the steps:
Step 301: pre-configured used threshold value: mistake piece thresholding, mistake piece tolerance cycle, shielding cycle, downward modulation cycle;
Step 302: whether then to judge Transmission Time Interval TTI,, then continue step 303, otherwise still execution in step 302 if then;
Step 303: judge the data block whether the CRC misdirection is arranged from the data block TB that this Transmission Time Interval TTI receives, if vicious TB piece, then execution in step 304, otherwise execution in step 314;
Step 304: correct block counter zero clearing, continue step 305;
Step 305: judge current masked state,, otherwise continue step 306 if the conductively-closed state is then got back to step 302;
Step 306: mistake piece counter adds the error block number of receiving in this TTI, continues step 307;
Step 307: mistake piece tolerance counter adds the total data piece number of receiving in this TTI, continues step 308;
Step 308: whether judge mistake piece tolerance counter more than or equal to the mistake piece tolerance cycle,, otherwise get back to step 302 if more than or equal to execution in step 309 then;
Step 309: judge the Errored block count device whether more than or equal to mistake piece thresholding,, otherwise get back to step 302 if more than or equal to execution in step 310 then;
Step 310: Errored block count device, mistake piece tolerance counter are clear 0, so that continue the judgement adjustment of next round afterwards, continue step 11;
Step 311: self adaptation is adjusted step-length, continues step 312;
Step 312: raise the target signal interference ratio, and notice NodeB, continue step 313;
Step 313: the shielding cycle is set, gets back to step 302;
Step 314: the correct data block counter adds total TB piece number of receiving in this TTI, in order to use when reducing the target signal interference ratio, continues step 315;
Step 315: judge whether current mistake piece tolerance counter is zero, if zero, then execution in step 316, otherwise jump to step 7;
Step 316: whether the correct judgment block counter more than or equal to the downward modulation cycle, if more than or equal to execution in step 317 then, otherwise gets back to step 302;
Step 317: correct block counter zero clearing, so that use next time; Continue step 318;
Step 318: downward modulation target signal interference ratio, and notice NodeB, get back to step 302.
Described WCDMA system power control method, the triggering message of described signal interference ratio error SIRerror is meant: when | SIRerror|＞SIRerror_threshold, wherein, SIRerror=SIR-SIRtarget_ave, the measurement report of transmission.
Described WCDMA system power control method, described target signal interference ratio SIRtarget is that normal exterior ring power is controlled the signal interference ratio that obtains or carried out the signal interference ratio that obtains after the control of high priority exterior ring power, be used to do closed power control, adjust user's transmitting power.
Described WCDMA system power control method, described high priority exterior ring power control comprises the steps:
Step 201: calculate the block error rate BLER value;
Step 202: make Value=BLER/BLERtarget;
Step 203: judge the SIRerror value, when SIRerror greater than 0 the time, then execution in step 204; Otherwise execution in step 207;
Step 204: judge that whether Value is greater than raising thresholding, if then execution in step 205; Otherwise, execution in step 206;
Step 205: raise the target signal interference ratio, execution in step 209 then;
Step 206: do not do exterior ring power control, wait for that closed power control continues to adjust transmitting power, execution in step 209;
Step 207: whether judge Value greater than the downward modulation thresholding, if, execution in step 206; Otherwise, execution in step 208;
Step 208: downward modulation target signal interference ratio, execution in step 209 then;
Step 209: return, if the adjustment of target signal interference ratio, then with new target signal interference ratio.
Described rise thresholding comprises following two kinds of situations: (1) SIRerror＞SIRerror_threshold, Value＞1; (2) SIRerror＞SIRerror_threshold, 0.1＜Value≤1.
Described downward modulation thresholding comprises following two kinds of situations: (1) SIRerror＜-SIRerror_threshold, 0.1＜Value≤1; (2) SIRerror＜-SIRerror_threshold, Value＜0.1
The described adjustment step-length that goes up mediation downward modulation target signal interference ratio can be made as: adjust coefficient * SIRerror.
The value of described SIRerror_threshold is 1dB.
The inventive method is according to the signal interference ratio error SIRerror that reports (mean value of SIRtarget is poor in the SIR of actual measurement and the some cycles) rapid adjustment SIRtarget; Adopt normal outer-loop power controlling method-thresholding method for reporting simultaneously when signal interference ratio SIR and the SIRtarget_ave difference of actual measurement surpass threshold value, the method that adopts the two-stage exterior ring power to control realizes the quick convergence of transmitting power.And determine that according to the difference of the Qos grade that different business satisfied the communication quality status of downward modulation cycle and current reality adopts adaptive step to adjust SIRtarget, has guaranteed that miscellaneous service its transmitting power under various environment can both restrain fast.
Description of drawings
Fig. 1 is the overview flow chart of the power control of WCDMA communication system;
Fig. 2 is the outer-loop power controlling method flow chart of high priority;
Fig. 3 is the thresholding report CRCI method flow diagram of normal exterior ring power control;
Fig. 4 is that the two-stage exterior ring power is controlled at the practical application structure chart in the WCDMA communication system
Embodiment
The major technique design of close-loop power controlling method of the present invention: the signal interference ratio SIR of base station measurement single-link, require the SIRTarget that sets to compare with the exterior ring power control algolithm according to Qos, the signal interference ratio SIR of control single-link approaches target SIR Target, report the quality information that obtains (to indicate-CRCI) adjust at a slow speed SIRtarget according to measurement simultaneously as cyclic redundancy check (CRC), so that quality of service does not fluctuate because of the variation of wireless environment, keep constant relatively communication quality.Here by the control of two-stage exterior ring power: the outer-loop power controlling method of high priority and normal outer-loop power controlling method (thresholding report CRCI event triggering method) are realized the quick convergence of power control.The high priority outer-loop power controlling method is to combine as the outer-loop power controlling method of decision rule with the SIRerror that provides in the special measurement report and the Block Error Rate (BLER) of actual measurement; Thresholding report CRCI method is exactly to tolerate cycle at given mistake piece that according to transmission channel CRC check result (the mistake piece tolerance cycle is a data transmission block window of statistics mistake piece number, tolerates the cycle then when the mistake piece, then needs mistake piece tolerance cycle zero clearing; The starting point of this window is the transmission block of first CRC check mistake of being monitored when mistake is zero the piece tolerance cycle) in statistics mistake piece number, if the mistake piece number of adding up in the tolerance cycle at the mistake piece has surpassed piece thresholding by mistake, then raise the target signal interference ratio; For the downward modulation principle be:, then reduce target SIR if in the downward modulation cycle, there is not the CRC check mistake.
The basic principle of two-stage exterior ring power control is as follows:
When not receiving the measurement report of Event triggered, then carry out normal exterior ring power control.After the exterior ring power control that executes high priority, then still adopt normal exterior ring power control algolithm to carry out exterior ring power control.And because the rarest 4～5 frames of loop time-delay that is to say that the effect of firm rise just can reflect after 4～5 frames, therefore be set the shielding cycle here, the mistake piece statistics of rise is no longer done in normal exterior ring power control in the shielding cycle.
When existing, Node B (NodeB) and UE communication context just can start exterior ring power control (normal exterior ring power control), when receiving the measurement report of the triggering of SIRerror again carrying out normal exterior ring power control period, then start the exterior ring power control process of high priority.
The general steps of the power control of WCDMA communication system:
Step 1: the initial and initial uplink target signal interference ratio of at first determining the user;
Step 2: start inner loop power control;
Step 3: start normal exterior ring power control rate control; Second step and the 3rd step are (closed power control comprise inner loop power control and normal exterior ring power control) that starts simultaneously in fact;
Step 4: doing whether receive the triggering message of NodeB when normal exterior ring power is controlled about SIRerror; If receive that then execution in step 5; Otherwise execution in step 9;
Step 5: hang up normal exterior ring power control, trigger the high priority outer-loop power controlling method, continue step 6;
Step 6: the return results of judging senior exterior ring power control; If do not make the sign of exterior ring power control, then execution in step 7; Otherwise execution in step 8;
Step 7: start timer, waiting timer then starts normal exterior ring power control once more; (effect of timer is in order to reserve the time of inner loop power control convergence)
Step 8: the shielding cycle is set, overcomes the loop time-delay,, carried out for the 9th step then so that when the normal exterior ring power of execution is controlled, in the shielding cycle, do not do mistake piece statistics;
Step 9: continue to carry out normal exterior ring power control, and then the execution that moves in circles from step 4.
Introduce this two-stage outer-loop power controlling method below respectively
One, the outer-loop power controlling method of high priority
In 3GPP TS 25.215 agreements, mention UTRAN (UMTS Terrestrial Radio AccessNetwork) side and need measure SIRerror, SIRerror=SIR-SIRtarget_ave, what SIRerror was the SIR that measures of current time with at the SIRtarget mean value of 80ms in the cycle is poor, SIRerror and power control also are closely-related, according to the value of SIRerror, can adopt value that exterior ring power control corrects initial given SIRtarget and the actual SIRtarget that should satisfy situation mutually far short of what is expected or make SIRtarget and the actual SIRtarget that should satisfy situation mutually far short of what is expected because of the variation of translational speed.
Table 1 has provided the nine kinds of situations of appearance and the correspondence table of corresponding SIRtarget method of adjustment:
Table 1
The following describes the reason that draws above-mentioned conclusion:
1. the plant situation: because the SIR of actual measurement this moment is than the big SIRerror_threshold of SIRtarget_ave, and this fashion can not satisfy required BLERtarget, this SIRtarget that just be described this moment can not satisfy present requirement, then need raise SIRtarget, the amplitude of rise is SIRerror.
2. the plant situation: because the SIR of actual measurement this moment is than the big SIRerror_threshold of SIRtarget_ave, and just in time can satisfy required BLERtarget at this moment, the SIRtarget that be described this moment need raise just and can meet the demands, and the amplitude of rise is SIRerror;
The 3. situation: because the SIR of actual measurement this moment is than the big SIRerror_threshold of SIRtarget_ave, and the communication quality of this moment is very good, and the BLER of actual measurement is little more a lot of than BLERtarget; But consider that present SIRest does not also converge to SIRtarget, therefore can directly reduce transmitting power and reduce Block Error Rate, and need not to do exterior ring power control by inner loop power control; Even run into when given SIRtarget than the actual little a lot of situation of SIR, this kind state also can be transformed into the and 2. plant or the 1. state, thereby raises SIRtarget;
4. the plant situation: because actual measurement this moment | SIRerror|≤SIRerror_threshold, illustrate that the SIRtarget that is provided with is within the patient scope of institute, it is just passable only need to do normal exterior ring power control this moment, need not consider the trigger condition of SIRerror; For the 5., 6. in situation and the 4. to plant situation identical;
7. the plant situation: because the SIR of actual measurement this moment is than the little SIRerror_threshold of SIRtarget_ave, and the communication quality of this moment is poor, and the BLER of actual measurement can not satisfy BLERtarget; But consider that present SIRest does not also converge to SIRtarget, therefore can directly increase transmitting power and reduce Block Error Rate, and need not to do exterior ring power control by inner loop power control; Even run into when given SIRtarget than the big a lot of situation of actual SIR, this kind state also can be transformed into the and 8. plant or the 9. plant state, thus downward modulation SIRtarget;
8. the plant situation: because the SIR of actual measurement this moment is than the little SIRerror_threshold of SIRtarget_ave, and just in time can satisfy required BLERtarget at this moment, the SIRtarget that be described this moment need reduce just and can meet the demands, the amplitude of downward modulation is SIRerror, and then does normal exterior ring power control;
9. the plant situation: because the SIR of actual measurement this moment is than the little SIRerror_threshold of SIRtarget_ave, and the BLER of actual measurement this moment is little more a lot of than BLERtarget, the SIRtarget that be described this moment is more a lot of greatly than needed SIRtarget, need downward modulation could improve the capacity of system, the amplitude of downward modulation is SIRerror, and then does normal exterior ring power control.
The value of SIRerror_threshold (threshold value of SIRerror) can be decided to be 1dB.
We at first must consider the trigger condition of SIRerror as can be known when doing exterior ring power control from top argumentation | SIRerror|＞SIRerror_threshold, promptly the priority of this trigger condition is the highest.That is to say and when this condition satisfies, then trigger the special measurement report message that CRNC is the high exterior ring power control of execution priority after receiving this message.
In conjunction with the accompanying drawings 2, the step of the outer-loop power controlling method of high priority is described:
Step 201: calculate the value of BLER in sliding window (the big I of window is made as M* (1/BLERtarget), and M is an adjustable value),
Step 202: make Diff_Value=BLER/BLERtarget;
Step 203: judge the SIRerror value, when SIRerror greater than 0 the time, show that then the SIR of actual measurement is more a lot of greatly than target signal interference ratio, then execution in step 204; Otherwise the SIR that shows actual measurement is little more a lot of than target signal interference ratio, and then execution in step 207;
Step 204: whether judge Diff_Value greater than the measured thresholding of matter (rise thresholding), if greater than showing that present communication quality can satisfy communication quality, then execution in step 205; Otherwise show the very good execution in step 206 of current communication quality;
Step 205: raise the target signal interference ratio, adjusting step-length can be made as: adjust coefficient * SIRerror, execution in step 209 then;
Step 206: show that the SIR for reality does not also converge to the target signal interference ratio this moment, do not do exterior ring power control, waits for that closed power control continues to adjust transmitting power, execution in step 209;
Step 207: whether judge Diff_Value greater than ropy thresholding (downward modulation thresholding), if, need execution in step 206 greater than showing that present communication quality is poor; Otherwise show that present communication quality can meet the demands, need execution in step 8 so this moment;
Step 8: downward modulation target signal interference ratio, adjusting step-length can be made as: adjust coefficient * SIRerror, execution in step 9 then;
Step 9: return (if adjust then with the fresh target signal interference ratio value).
Two, thresholding report CRCI method
Algorithm principle: (the mistake piece tolerance cycle is a data transmission block window of statistics mistake piece number, when the piece tolerance cycle then then needs mistake piece tolerance cycle zero clearing by mistake in the given mistake piece tolerance cycle according to transmission channel CRC check result; The starting point of this window is the transmission block of first CRC check mistake of being monitored when mistake is zero the piece tolerance cycle) in statistics mistake piece number, if the mistake piece number of adding up in the tolerance cycle at the mistake piece has surpassed piece thresholding by mistake, then raise the target signal interference ratio; For the downward modulation principle then is if do not have the CRC check mistake then reduce target SIR in the downward modulation cycle; The step-length that goes up the downward modulation target SIR here can be made as identical, service quality for different Q os is embodied on the determining of downward modulation cycle, for the downward modulation cycle really normal root determine according to the BLERtarget of different business: M* (1/BLERtarget), wherein M is an adjustable value, and scope can be decided to be 1～3.Because the purpose that raises is to improve professional service quality on the basis of original communication quality, therefore when determining mistake piece tolerance cycle and mistake piece thresholding, do not consider professional Qos, only need determine that to all business a class value gets final product.
And because the rarest 4～5 frames of loop time-delay that is to say that the effect of firm rise just can reflect after 4～5 frames.If therefore occur the CRC misdirection again in 4～5 frames after this, (the shielding cycle can be set here masks the adjustment function then just not do mistake piece statistics, the shielding cycle is the time of 4 ~ 5 frames), Deng being this 4～5 frame, if occurred the CRCI misdirection again, begin mistake piece statistics more again.If in the shielding cycle, do not monitor crc error, then reduce counter and add 1, judge then whether the downward modulation counter has arrived the downward modulation cycle, if then then reduce SIRtarget, if not to then not adjusting.
The implementation of thresholding method for reporting is described below in conjunction with Fig. 3:
Step 301: at first want more pre-configured in algorithm used threshold value: mistake piece thresholding, mistake piece tolerance cycle, shielding cycle, downward modulation cycle;
Step 302: judge that whether then transmission intercal (because the recipient receives a secondary data every a Transmission Time Interval (TTI), therefore the data that receive are being judged whether just should indeed carry out every the TTI time), if then, then continued for the 303rd step, otherwise, still carried out for the 302nd step;
Step 303: judge that the data block whether the CRC misdirection is arranged is (because each TTI can receive several data block numbers from the data block (TB) that this TTI receives, if the CRC of certain TB piece is designated as mistake, illustrate that then this TB piece is wrong), if vicious TB piece, then execution in step 304, otherwise execution in step 314;
Step 304: correct block counter zero clearing, continue step 305;
Step 305: judge current masked state,, otherwise continue step 306 if the conductively-closed state is then got back to step 302;
Step 306: mistake piece counter adds the error block number of receiving in this TTI, continues step 307;
Step 307: mistake piece tolerance counter adds the total data piece number of receiving in this TTI, continues step 308;
Step 308: whether judge mistake piece tolerance counter more than or equal to the mistake piece tolerance cycle,, otherwise get back to step 302 if more than or equal to execution in step 309 then;
Step 309: judge the Errored block count device whether more than or equal to mistake piece thresholding,, otherwise get back to step 302 if more than or equal to execution in step 310 then;
Step 310: explanation at this moment needs to raise the target signal interference ratio, at first Errored block count device, mistake piece is tolerated counter clear 0 so that continue the judgement adjustment of next round afterwards, continues step 311;
Step 311: raise the target signal interference ratio and must at first determine to raise step-length, adopt self adaptation to adjust the method for step-length here: dynamically adjust according to the number of times of the continuous rise target signal interference ratio that writes down and raise step-length (extraction right characteristic); Continue step 312;
Step 312: raise target signal interference ratio (the current target signal interference ratio is added the adjustment step-length), and notice NodeB, continue step 313;
Step 313: the shielding cycle (be equivalent to be provided with a timer, the mistake piece number that is during this period of time occurred is not done statistics, and timer then this shielding action disappears) is set, gets back to step 2;
Step 314: the correct data block counter adds total TB piece number of receiving in this TTI, in order to use when reducing the target signal interference ratio, continues step 315;
Step 315: judge whether current mistake piece tolerance counter is zero, if zero, then execution in step 316, otherwise jump to step 307;
Step 316: whether the correct judgment block counter more than or equal to the downward modulation cycle, if more than or equal to execution in step 317 then, otherwise gets back to step 302;
Step 317: correct block counter zero clearing, so that use next time; Continue step 318;
Step 318: downward modulation target signal interference ratio (for downward modulation target signal interference ratio, it adjusts step-length is initial given no longer adjusting), and notice NODEB, get back to step 302.
Describe the two-stage exterior ring power below in conjunction with accompanying drawing 4 and be controlled at concrete application in the WCDMA communication system:
Exterior ring power control is carried out in RNC (control of RADIO NETWORK CONTRL infinite network) in the WCDMA communication system.
At up direction, after the communication context between NodeB and user was set up and begun to transmit data, RNC can send to NodeB and measure control messages this moment, notified the NodeB measurement parameter, reported mode etc.As can be seen from Figure 4, this moment, NodeB and RNC were separately in the task of carrying out this module: every wireless links signal interference ratio that (1) NodeB period measurement receives, and the mean value of computation of Period SIRtarget, thereby obtain SIRerror=SIR-SIRtarget_ave (411).NodeB judges whether the absolute value of SIRerror surpasses SIRerror_threshold (412) then, if surpass threshold value (trigger condition of reporting measurement reports), then NodeB sends measurement report to RNC, otherwise NodeB continues to measure SIR, does not send measurement report to RNC.(2) RNC begins to carry out the outer-loop power controlling method (421) of normal condition, the Frame that RNC transmits up according to NodeB obtains the Block Error Rate of the every wireless links of CRCI (CRC indication) statistics of each transmission block (TB), obtain new SIRtarget (422) by outer-loop power controlling method, by Frame SIRtarget is sent to NodeB then, NodeB does closed power control according to new SIRtarget, adjusts user's transmitting power.
As NodeB because the trigger condition of SIRerror when satisfying, then trigger RNC and hang up normal exterior ring power control (423) by measurement report, begin to carry out high priority exterior ring power controlled step (424), make SIRtarget converge to the value of the service quality that satisfies transport service faster.After high priority exterior ring power controlled step is finished, SIRtarget is sent to NodeB, start normal exterior ring power control (421) then again by Frame.As long as the communication context between NodeB and the UE exists, and data are in the channel with closed power control, and then normal outer-loop power controlling method is performed always.The high priority outer-loop power controlling method is then only just carried out when trigger condition satisfies, and just withdraws from after executing, and the RNC power control module can be done corresponding processing according to the sign of returning of high priority exterior ring power control then; If the sign of returning is to hang up exterior ring power control (425), then start timer, waiting timer then just starts normal exterior ring power control (426) once more; If what return is new up signal interference ratio desired value, then start normal exterior ring power control at once.
The present invention proposes a kind of outer-loop power controlling method of quick convergence, the method is according to the SIRerror that reports (mean value of SIRtarget is poor in the SIR of actual measurement and the some cycles) rapid adjustment SIRtarget; When surpassing threshold value, SIR and the SIRtarget_ave difference of actual measurement adopt normal outer-loop power controlling method-thresholding to report the CRCI method simultaneously.This method goes up the quick convergence of guaranteed output control from the control of two-stage exterior ring power, when the given SIRtarget and the SIR of actual measurement are mutually far short of what is expected, adopt the exterior ring power control algolithm of high priority to make transport service can satisfy the requirement of service quality fast, when differing, the SIR of SIRtarget and actual measurement adopt when not being a lot of the method for thresholding report CRCI that SIRtaget is finely tuned simultaneously, guarantee that actual SIR can restrain fast accurately, and its essence is exactly to make professional communication quality satisfy service quality fast.And the self adaptation that relatively adopts of determining the communication quality status of corresponding downward modulation cycle and current reality according to the difference of the Qos grade that different business satisfied is adjusted the method for step-length, also makes power control further restrain fast.This method is considered the convergence problem that power is controlled from Qos grade, mobile communication environment, the real-time many-sides such as communication quality of institute's transport service, has actual using value.In a word, adopt the method for two-stage exterior ring power control can guarantee that the transmitting power of user and NodeB restrains fast, thereby guarantee the service quality of transport service, can improve the capacity of system simultaneously again.
Claims (10)
1. a WCDMA system power control method is characterized in that, comprises the steps:
Step 1: the initial and initial uplink target signal interference ratio SIR that determines the user;
Step 2: start inner loop power control;
Step 3: start normal exterior ring power control;
Step 4: the triggering message that judges whether to receive signal interference ratio error SIRerror; If receive that then execution in step 5; Otherwise execution in step 9;
Step 5: hang up normal exterior ring power control, trigger the control of high priority exterior ring power;
Step 6: the return results sign of judging the control of high priority exterior ring power; If do not make the sign of exterior ring power control, then execution in step 7; Otherwise execution in step 8;
Step 7: start timer, waiting timer then starts normal exterior ring power control once more;
Step 8: the shielding cycle is set, overcomes the loop time-delay, so that when the normal exterior ring power of execution is controlled, in the shielding cycle, do not do mistake piece statistics;
Step 9: carry out the control of normal exterior ring power, and then the execution that moves in circles from step 4.
2. WCDMA system power control method according to claim 1 is characterized in that described step 2 and step 3 start simultaneously.
3. WCDMA system power control method according to claim 1 is characterized in that, described normal exterior ring power control comprises the steps:
Step 301: pre-configured used threshold value: mistake piece thresholding, mistake piece tolerance cycle, shielding cycle, downward modulation cycle;
Step 302: whether then to judge Transmission Time Interval TTI,, then continue step 303, otherwise still execution in step 302 if then;
Step 303: judge the data block whether the CRC misdirection is arranged from the data block TB that this Transmission Time Interval TTI receives, if vicious TB piece, then execution in step 304, otherwise execution in step 314;
Step 304: correct block counter zero clearing, continue step 305;
Step 305: judge current masked state,, otherwise continue step 306 if the conductively-closed state is then got back to step 302;
Step 306: mistake piece counter adds the error block number of receiving in this TTI, continues step 307;
Step 307: mistake piece tolerance counter adds the total data piece number of receiving in this TTI, continues step 308;
Step 308: whether judge mistake piece tolerance counter more than or equal to the mistake piece tolerance cycle,, otherwise get back to step 302 if more than or equal to execution in step 309 then;
Step 309: judge the Errored block count device whether more than or equal to mistake piece thresholding,, otherwise get back to step 302 if more than or equal to execution in step 310 then;
Step 310: Errored block count device, mistake piece tolerance counter are clear 0, so that continue the judgement adjustment of next round afterwards, continue step 11;
Step 311: self adaptation is adjusted step-length, continues step 312;
Step 312: raise the target signal interference ratio, and notice NodeB, continue step 313;
Step 313: the shielding cycle is set, gets back to step 302;
Step 314: the correct data block counter adds total TB piece number of receiving in this TTI, in order to use when reducing the target signal interference ratio, continues step 315;
Step 315: judge whether current mistake piece tolerance counter is zero, if zero, then execution in step 316, otherwise jump to step 7;
Step 316: whether the correct judgment block counter more than or equal to the downward modulation cycle, if more than or equal to execution in step 317 then, otherwise gets back to step 302;
Step 317: correct block counter zero clearing, so that use next time; Continue step 318;
Step 318: downward modulation target signal interference ratio, and notice NodeB, get back to step 302.
4. WCDMA system power control method according to claim 1, it is characterized in that the triggering message of described signal interference ratio error SIRerror is meant: when | SIRerror|＞SIRerror_threshold, wherein, SIRerror=SIR-SIRtarget_ave, the measurement report of transmission.
5. as WCDMA system power control method as described in the claim 4, it is characterized in that, described target signal interference ratio SIRtarget is that normal exterior ring power is controlled the signal interference ratio that obtains or carried out the signal interference ratio that obtains after the control of high priority exterior ring power, be used to do closed power control, adjust user's transmitting power.
6. WCDMA system power control method according to claim 1 is characterized in that, described high priority exterior ring power control comprises the steps:
Step 201: calculate the block error rate BLER value;
Step 202: make Value=BLER/BLERtarget;
Step 203: judge the SIRerror value, when SIRerror greater than 0 the time, then execution in step 204; Otherwise execution in step 207;
Step 204: judge that whether Value is greater than raising thresholding, if then execution in step 205; Otherwise, execution in step 206;
Step 205: raise the target signal interference ratio, execution in step 209 then;
Step 206: do not do exterior ring power control, wait for that closed power control continues to adjust transmitting power, execution in step 209;
Step 207: whether judge Value greater than the downward modulation thresholding, if, execution in step 206; Otherwise, execution in step 208;
Step 208: downward modulation target signal interference ratio, execution in step 209 then;
Step 209: return, if the adjustment of target signal interference ratio, then with new target signal interference ratio.
7. as WCDMA system power control method as described in the claim 6, it is characterized in that described rise thresholding comprises following two kinds of situations: (1) SIRerror＞SIRerror_threshold, Value＞1; (2) SIRerror＞SIRerror_threshold, 0.1＜Value≤1.
8. as WCDMA system power control method as described in the claim 6, it is characterized in that described downward modulation thresholding comprises following two kinds of situations: (1) SIRerror＜-SIRerror_threshold, 0.1＜Value≤1; (2) SIRerror＜-SIRerror_threshold, Value＜0.1
9. as WCDMA system power control method as described in the claim 6, it is characterized in that described going up is in harmonious proportion the adjustment step-length of downward modulation target signal interference ratio and can be made as: adjust coefficient * SIRerror.
10. as WCDMA system power control method as described in the claim 4,7,8, it is characterized in that the value of described SIRerror_threshold is 1dB.
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| CN101772142A (en) * | 2010-03-02 | 2010-07-07 | 北京大学 | Single-hop satellite communication terminal method for controlling power thereof |
| WO2010078790A1 (en) * | 2008-12-29 | 2010-07-15 | 华为技术有限公司 | Transmission power adjusting method, apparatus and system |
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| US6807164B1 (en) * | 1999-09-14 | 2004-10-19 | Telefonaktiebolaget Lm Ericsson (Publ) | Power control in a CDMA mobile communication system |
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