CN101188442B - Closed loop power control method - Google Patents
Closed loop power control method Download PDFInfo
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- CN101188442B CN101188442B CN2006101451564A CN200610145156A CN101188442B CN 101188442 B CN101188442 B CN 101188442B CN 2006101451564 A CN2006101451564 A CN 2006101451564A CN 200610145156 A CN200610145156 A CN 200610145156A CN 101188442 B CN101188442 B CN 101188442B
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Abstract
The invention proposes a closed loop power control method, and includes the following steps: (a), a base station is set to send the instructions successively to increase the times of power command to be a maximum value N, and then n is set to represent the power command times added by the current sent instructions in succession, and the initial value of n is 0; (b), the base station firstly judges the n is equal to the designated value N or not in every time interval, if not, the next step is executed; otherwise, the instruction of reducing the power command is sent to a terminal, at the same time n is made equal to 0 and waits for the arrival of anther time interval, and n is further judged to be equal to N or not; (c), whether the signal quality meets the signal quality that is requested by the system or not is judged, if so, the base station sends the instruction of reducing the power command to the terminal, at the same time n is made equal to 0, otherwise, the base station sends the instruction of increasing the power command to the terminal, and the value of n is added with 1 to be transferred to the step (b). The method of the invention can effectively control the sending of base station TPC commands, and control the power lifting margin of mobile platform transmitting power, thereby guaranteeing the stability of the system.
Description
Technical field
The present invention relates to the Poewr control method in a kind of code division multiple access (CDMA:Code-Division Multiple-Access) communication system, in particular, a kind of close-loop power controlling method that is applicable to special uplink channel.
Background technology
Power control techniques is the basis of cdma system, and we can say does not have power control just not have cdma system.Cdma system is one, and any unnecessary unnecessary power does not allow emission with frequency self-interference system, total this is the criterion that must observe, power control is exactly the means of safeguarding this criterion.
In up link, if the transmitting power of all travelling carriages is identical in the sub-district, and the distance of each travelling carriage and base station (Node B) is different, it is very strong to cause the base station to receive the signal of nearer travelling carriage, the signal that receives travelling carriage far away is very weak, because CDMA is with the frequency receiving system, cause weak signal to be submerged in the strong signal, thereby make that distance can't operate as normal than the travelling carriage of distal part, the near-far problem that exists in the cdma system up link that Here it is, power control can overcome near-far interference, and for uplink power control, the target of power control is enough the getting final product of power that all signals arrive the base station.
Power control can compensate decline, requires emission side to increase transmitting power when received power is not enough.Because mobile channel is a fading channel, fast closed-loop power control can change transmitting power fast along with the fluctuating of signal, makes incoming level become smooth by fluctuating.
Power control is divided into control of up (oppositely) power and the control of descending (forward direction) power by direction in cdma system; Whether participate in being divided into again open Loop Power control and closed power control two big classes simultaneously by travelling carriage and base station.Open Loop Power control is to measure disturbed condition from channel, and adjusts transmitting power, and purpose is the Initial Trans of new requested service is made estimation.Open Loop Power control is to measure frame error rate (Block Error Rate), adjusts target signal interference ratio (target SIR).Fast closed-loop power control is meant that the recipient the signal interference ratio desired value of the signal interference ratio of the signal that receives and control channel relatively, return a TPC (transmitting power control) order according to comparative result to transmit leg, if measure SIR＞target SIR, then the TPC order is 0; If measure SIR≤target SIR, then the TPC order is 1; Transmit leg is according to the TPC order that receives, the closed loop power control algorithm given by high level draws TPC_cmd, if adopt TPC command process algorithm 1 and transmit leg not to be under the case of soft handover, equal at 0 o'clock in the TPC order that receives, the TPC_cmd that is used for this time slot so is-1; Equal at 1 o'clock in the TPC order that receives, the TPC_cmd that is used for this time slot so is 1; And then decision is to increase transmitting power or reduce transmitting power, the amplitude=TPC_cmd of adjustment * Δ TPC.Adjust the transmitting power of uplink special physical channel with step delta TPC, step delta TPC can get 1dB or 2dB also by network settings.If TPC_cmd equals 1, then increase the up special-purpose trade of travelling carriage transmitting power; If TPC_cmd equals-1, then reduce travelling carriage special uplink channel transmitting power.
The initial value of special uplink channel transmitting power is estimated decision with open loop power.The maximum power value of purpose of closed loop transmit power is provided with by high level, uplink closed loop mainly is to try one's best near the sir target value with the up signal to noise ratio that keeps receiving by the transmitting power of adjusting travelling carriage in the base station, and the sir target value of each sub-district is all adjusted by high-rise exterior ring power control.
Because the up-link capacity of cdma system is interference-limited, up is the many-one communication pattern, utilizes power control techniques to eliminate near-far interference.Be to disturb entirely except that the signal of oneself,, make the signal to noise ratio reduction when the user disturbs greatlyyer more for a long time; In order to reach specified signal to noise ratio, must increase transmitting power by power control, cause to interact, unrealistically compare mutually, cause power ramp, make the gross power of reception exceed the range of linearity of preposition linear amplifier at last, cdma system is no longer set up, promptly caused system crash.
Summary of the invention
The technical problem to be solved in the present invention provides the Poewr control method in a kind of code division multiple address communication system, solve when the user increases the interference increasing, user's signal to noise ratio reduces, may in a period of time, be lower than specified signal to noise ratio always, the problem of the continual increase of transmission power of mobile station, thereby avoid the soaring of power between the user, guarantee the stability of whole system.
The present invention proposes a kind of close-loop power controlling method, comprises following steps:
(a) set the base station and send the number of times maximum N that indication increases the order of power continuously, set n again and represent current continuous transmission indication to increase the number of times of power command, the initial value of n is 0;
(b) base station judges at first at each time slot whether n equals designated value N, if not, carry out next step; Otherwise, send indication and reduce ordering of power to terminal, with seasonal n=0, wait for that next time slot arrives, continue to judge whether n equals N;
(c) judge whether quality of signals reaches the demand on signal quality of system's regulation, if the base station sends indication and reduces ordering to terminal of power, with seasonal n=0, otherwise the base station sends indication increases ordering to terminal of power, and the n value adds 1, forwards step (b) to.
The value of described N value is according to power system capacity, and signal quality and transmission power of mobile station satisfy under the principle of real system requirement, by test, determines N value or N value span.
Described indicated horsepower increase or the order that reduces are transmitting power control TPC order.
The TPC order is 0 o'clock in the described step (c), and indication reduces power; The TPC order is 1 o'clock, and indication increases power.
Signal quality is weighed by signal signal interference ratio SIR in the described step (c).
Described signal signal interference ratio SIR is according to uplink special physical channel DPCCH data computation.
System determines the demand on signal quality that system stipulates according to exterior ring power control result, and promptly target SIR is in service in system, can revise the value of N according to actual effect.
Uplink closed loop method in a kind of code division multiple address communication system provided by the present invention, compared with prior art, can effectively control the transmission of base station TPC order, and then the instantaneous lifting of the transmitting power of control travelling carriage is too high, prevent RSSI (the Received Signal StrengthIndicator of sub-district, broadband reception power in the channel width) instantaneous rising, can control the transmission number of base station consecutive TPC commands 1 simultaneously by the count value N that revises place, base station counter, the amplitude of control transmission power of mobile station lifting, thus the stable of whole system guaranteed.
Description of drawings
Fig. 1 is the processing block diagram of exterior ring power control and fast closed-loop power control;
Fig. 2 is a WCDMA system-specific physical channel DPCCH/DPDCH frame format schematic diagram;
Fig. 3 is the specific embodiments flow chart of Poewr control method of the present invention;
Fig. 4 is that Poewr control method of the present invention and Poewr control method of the prior art compare schematic diagram to UE transmitting power lifting amplitude.
Embodiment
Below in conjunction with accompanying drawing, will be that example is described in further detail technical scheme of the present invention with the WCDMA system, according to following described embodiment, the technical staff in same field can be easy to realize the present invention.
Be the processing block diagram of exterior ring power control and fast closed-loop power control as shown in Figure 1.RNC (base station controller) determines target SIR according to exterior ring power control result, informs the base station.The base station compares with SIR and the target SIR measured according to the SIR of uplink special physical channel data computation current time slots, and it still is 1 that decision issues TPC order 0, and then the control travelling carriage is lifting transmitting power or reduction transmitting power.
Be WCDMA system-specific physical channel DPCCH/DPDCH frame format block diagram as shown in Figure 2.The frequency of the up fast closed-loop power control of WCDMA system is 1500HZ, one frame is 10ms, 15 time slots of every frame, the SIR of each time slot utilizes the DPCCH data computation of current time slots to obtain, (SF is the spreading factor of current time slots to SIR=SF*RSCP/ISCP, RSCP is received signal pilot tone (Pilot) part power, and ISCP is an interference code power).
Be the implementing procedure figure of Poewr control method technical scheme of the present invention as shown in Figure 3.
In system be set the stage, determine the N value, be i.e. the number of Node B consecutive TPC commands 1 transmission.The value of N value mainly needs to choose by experimental test.In the actual tests test, can be according to power system capacity, signal quality and transmission power of mobile station satisfy under the principle of real system requirement, select to determine suitable N value or N value scope.Suppose to make N=4, then sent out TPC order 1 continuously as Node B at preceding 4 time slots, so in current time slots no matter whether measure SIR greater than target SIR, Node B issues TPC order 0.
When system operation initial, the rolling counters forward value n=0 that initialization TPC order 1 sends.
In system's operation phase, carry out single treatment at each time slot, each following step of main branch of handling is carried out:
Step 110: judge at first whether rolling counters forward value n equals N, gets N=4 in this example, if the count value of counter equals N, is 4, execution in step 120, otherwise, execution in step 130;
Step 130: according to the SIR of uplink special physical channel DPCCH data computation current time slots;
Step 140: compare with mensuration SIR that calculates and target SIR, if measure SIR greater than target SIR, execution in step 150; Otherwise, if measure SIR smaller or equal to target SIR, execution in step 160;
Step 150: current time slots issues TPC order 0, with seasonal n=0; Finish;
Step 160: current time slots issues TPC order 1, with seasonal n++; Finish.
Being an example of the present invention as shown in Figure 4, is that new Poewr control method described herein and Poewr control method before compare UE (user side travelling carriage) transmitting power lifting amplitude shown in the figure.Suppose in the transmitting power of time slot (slot) #1UE to be-10dBm, if continuous 30 time slots are measured SIR all less than target SIR, the processing of old scheme is to issue TPC order 1 continuously in these 30 time slot base station, the lifting transmitting power that UE will not stop, the transmitting power of UE is lifted to 20dBm behind 30 time slots, and the processing of new departure is if continuous 4 time slots in front issue TPC order 1, just issue TPC order 0 in current time slots, the transmitting power of UE only is lifted to 8dBm behind 30 time slots, new departure can shift to an earlier date 12 time slots the transmitting power of UE is dropped to initial value like this, reduce interference to other users, the stability that helps system, from the angle of UE, new departure old scheme will consume energy about 1/2 less, have different effects if the N value is different, can change the N value as required here.
Claims (8)
1. close-loop power controlling method comprises following steps:
(a) set the base station and send the number of times maximum N that indication increases the order of power continuously, set n again and represent current continuous transmission indication to increase the number of times of power command, the initial value of n is 0;
(b) base station judges at first at each time slot whether n equals N, if not, carry out next step; Otherwise, send indication and reduce ordering of power to terminal, with seasonal n=0, wait for that next time slot arrives, continue to judge whether n equals N;
(c) judge whether the quality of signals of measuring reaches the demand on signal quality of system's regulation, if the base station sends indication and reduces ordering to terminal of power, with seasonal n=0, otherwise the base station sends indication increases ordering to terminal of power, the n value adds 1, forwards step (b) to.
2. the method for claim 1, it is characterized in that: the value of described N value is according to power system capacity, and signal quality and transmission power of mobile station satisfy under the principle of real system requirement, by test, determines N value or N value span.
3. the method for claim 1 is characterized in that: described indicated horsepower increases or the order that reduces is transmitting power control TPC order.
4. method as claimed in claim 3 is characterized in that: the TPC order is 0 o'clock in the described step (c), and indication reduces power; The TPC order is 1 o'clock, and indication increases power.
5. the method for claim 1 is characterized in that: signal quality is weighed by signal signal interference ratio SIR in the described step (c).
6. method as claimed in claim 5 is characterized in that: described signal signal interference ratio SIR is according to uplink special physical channel DPCCH data computation.
7. method as claimed in claim 5 is characterized in that: radio network controller (RNC) is determined the demand on signal quality that system stipulates, i.e. target SIR according to exterior ring power control result.
8. the method for claim 1 is characterized in that: in service in system, revise the value of N according to actual effect.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006101451564A CN101188442B (en) | 2006-11-15 | 2006-11-15 | Closed loop power control method |
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| CN2006101451564A CN101188442B (en) | 2006-11-15 | 2006-11-15 | Closed loop power control method |
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| CN101188442A CN101188442A (en) | 2008-05-28 |
| CN101188442B true CN101188442B (en) | 2011-08-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105451318A (en) * | 2014-07-31 | 2016-03-30 | 展讯通信（上海）有限公司 | Transmitting power control system and method and mobile terminal |
| WO2017049532A1 (en) * | 2015-09-24 | 2017-03-30 | 华为技术有限公司 | Method and apparatus for reporting synchronization and out-of-synchronization states, and user equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1491048A (en) * | 2002-10-18 | 2004-04-21 | 华为技术有限公司 | Closed-loop power controlling method in radio communication system |
| CN1578489A (en) * | 2003-07-29 | 2005-02-09 | 大唐移动通信设备有限公司 | Power control method for mobile communication system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1491048A (en) * | 2002-10-18 | 2004-04-21 | 华为技术有限公司 | Closed-loop power controlling method in radio communication system |
| CN1578489A (en) * | 2003-07-29 | 2005-02-09 | 大唐移动通信设备有限公司 | Power control method for mobile communication system |
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