CN1499755A - Optimized method for controlling outer ring power and device - Google Patents
Optimized method for controlling outer ring power and device Download PDFInfo
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Abstract
Based on block error rate (BLER) and transmission channel error rate (Trch BER), the invention discloses method for controlling power in external ring in order to overall evaluate link quality as well as gives out mode for controlling optimal power in external ring. Comparing with method based on BLER, the said method controls overall power with accurate and in effect. Through optimal procedure for controlling power in external ring, the target threshold for controlling power in internal ring is setup reasonably so as to meet requirement of link quality. Based on principle of meeting requirement of link quality, but not making too much allowance, the invention guarantees power control to meet capability of whole system.
Description
(1) technical field
The method and apparatus of the exterior ring power that the present invention relates to optimize in mobile radio system control refers in particular to novel, the method and apparatus that improves, optimize of a kind of exterior ring power control in the 3-G (Generation Three mobile communication system).
(2) background technology
In recent years, the progress of information technology has driven the fast development of mobile communication, and radio communication has been deep into the every aspect of industry, commercial affairs and personal lifestyle, and 3-G (Generation Three mobile communication system) has caused industrial circle personage's extensive concern.
For 3-G (Generation Three mobile communication system), it can provide flexile business such as data service, multimedia service and higher quality of service, bigger wireless coverage etc. for the user except having, a very outstanding target is the power system capacity that can provide bigger, to satisfy growing traffic needs.
For portable terminal, its a very important design object is low-power consumption.Lower power consumption produces the energy loss that reduces, and to prolong the battery useful life of portable terminal, reduces the electromagnetic radiation to the hand-held person of terminal, realizes well received day by day environmental protection.
And in code division multiple access (CDMA) system, all users are owing to adopt the multi-access mode of code division multiplexing to communicate, and promptly all users transmit and receive signal in identical time, similar frequency bands.The signal of each user's emission all can produce interference to other users, and promptly usually said multiple access disturbs.So the signal energy from nearer travelling carriage that the base station receives is flooded the signal from travelling carriage far away probably, produces so-called " near-far interference ".
Can be by the signal transmission power of each travelling carriage transmitter in the control system, the signal quality and the multiple access that make the power of expecting communication link remain on expectation in floor level, the system disturb the acceptable level that maintains, thereby guarantee the capability of communication system maximum.
Existing power control techniques has certain advance, but still has many deficiencies:
Exercise question is the Chinese patent NO.96192934 of " carrying out the method and apparatus of power control in mobile communication system ", a kind of closed loop real-time power control method has been proposed, it detects motion velocity of mobile station and frame error rate as link quality metric, and adjusts transmitting power in view of the above.The thought of this invention has certain advance, but realizes that the corresponding link quality metric still has certain difficulty, and is easy to produce power control additional delay, causes the power control fails;
Exercise question has proposed to calculate in a kind of open loop power control the equipment and the method for transmission power of mobile station for the Chinese patent NO.00101176 of " open Loop Power control of radio mobile station ".Wherein the Access Probe by travelling carriage disturbs correction with estimation path loss, thereby carries out the suitable control of transmission power of mobile station.But this method does not provide adjustment foundation and the method for exterior ring power control to inner loop power controlled target signal to noise ratio.
Exercise question is adjusted for the Chinese patent NO.00116996 of " a kind of exterior ring power control method and apparatus " is used for exterior ring power control with fuzzy control theory, has proposed a kind ofly to carry out adaptive tracking method and the device that signal to noise ratio SIR thresholding is adjusted based on error rate BER measured value and variable quantity thereof.But this invention only improves at the method for adjustment of SIR thresholding, does not mention practicable BER method of measurement, and also only is dependent only on the BER measurement for the adjustment of SIR.
Exercise question is the United States Patent (USP) NO.5590409 of " transmit power controlling method and device ", has proposed the transmission power of mobile station control method in a kind of cdma system.The mean value of moving table measuring desired signal received signal power in the transmitting power control cycle wherein, and current measured value is to last deviation of measuring value, carry out open-loop power adjustment then in view of the above, if promptly measured deviation is greater than the reference power deviation, then by the transmitting power of open Loop Power control setting, to reduce transmission power of mobile station fast corresponding to this measured deviation; Otherwise, then determine transmitting power according to the power control bit word.This method has certain new meaning, but because it does not make further processing when wireless channel environment is better, so also will sacrifice a part of power system capacity.
In a word, existing Poewr control method is controlled the evaluation of link-quality mostly based on receiving Block Error Rate (BLER) or frame error rate (FER) for power.But it should be noted that receiving under the identical situation of Block Error Rate that its transmission channel bit error rate (Trch BER) but has very big-difference, especially for data service, it is especially outstanding that this point becomes.Carrying out exterior ring power when control, if only with Block Error Rate weigh communication link quality, the setting (as, target signal to noise ratio SIRtarget) of carrying out inner loop power control relevant parameter is obviously very insufficient, too rough.And also will be, thereby influence the further raising of overall system capacity and communication performance because of its incomplete further performance that limits whole power control loop joint integration capability that link-quality is described and perfect based on the link-quality evaluation of Block Error Rate.So, also will be poor efficiency as the rough whole power control loop joint of measuring (comprising inner-loop power control and external circule power control) of link-quality based on Block Error Rate.
(3) summary of the invention
The present invention is directed to traditional exterior ring power and control the weak point that is optimized processing based on Block Error Rate, proposed to carry out the outer-loop power controlling method of link-quality overall merit based on Block Error Rate and transmission channel bit error rate, provided the exterior ring power control model of optimizing, the present invention has also proposed to carry out the method and apparatus that transmission channel bit error rate is measured.
Core concept of the present invention is to improve in the communication system link-quality in the outer shroud power control process or the interpretational criteria of systematic function, has proposed outer-loop power controlling method and the device optimized.
The present invention proposes a kind of outer-loop power controlling method of optimization, and wherein said outer-loop power controlling method comprises:
(1) based on the cyclic redundancy check (CRC) of encoding unit, Block Error Rate is measured;
(2) transmission channel bit error rate is estimated;
(3) be the suitable link-quality evaluation method decision threshold of exterior ring power control setting;
(4) the outer shroud power control mode is selected, when measuring Block Error Rate greater than thresholding, communication link quality is relatively poor, then enters the exterior ring power control model based on Block Error Rate, to exterior ring power control the carrying out adjustment of thick formula; When measuring Block Error Rate less than thresholding, communication link quality is better, then enter exterior ring power control model based on transmission channel bit error rate, so that further the becoming more meticulous of exterior ring power control, in communication process, to constantly communicate the link-quality evaluation, constantly carry out two kinds of switchings between power control mode;
(5) carry out exterior ring power control procedure under the corresponding modes, carry out and measure the adjustment of Block Error Rate, transmission channel bit error rate for target gate.
A kind of exterior ring power control device of optimization of the method design according to claim 1, the power control of exterior ring power control device comprise that ascending exterior ring power control and downlink outer loop power controls, and wherein said exterior ring power control device comprises:
Wireless network control unit carries out exterior ring power control, is mainly used in the ascending exterior ring power of the initial transmissions that travelling carriage is set, the downlink outer loop power of the initial transmissions of base station, and the target gate of received signal to noise ratio;
Travelling carriage, carry out the down link snr measurement, after mobile station receiver is handled to received signal by the radio frequency/intermediate frequency converting unit, demodulation recovers power control word (TPC) instruction in base band receiving element RX, after the power control word instruction that TPC command process unit receives travelling carriage is suitably handled, be used for controlling the transmission power adjustment of travelling carriage transmitter unit TX, send to then after intermediate frequency/the radio frequency converting unit is done respective handling, go out by air interface transmission; Simultaneously, after the receiving element RX of travelling carriage, carry out descending received signal to noise ratio in the sir measurement unit and measure, in TPC order generation unit, generate the power control word then, and be inserted into and send to the base station in the uplink frame, thus the transmitting power of control base station; Input processing unit has been controlled the transmission power adjustment of travelling carriage transmitter unit TX.
Characteristics of the present invention:
1, adopted more complete, reliable communication link quality to estimate and method of measurement, and as the evaluation foundation of exterior ring power control;
2, provided the detailed method and apparatus of estimating for transmission channel bit error rate;
3, Block Error Rate and transmission channel bit error rate are combined be used for the adjustment of exterior ring power control, proposed two kinds of patterns of exterior ring power control for the inner loop power Control Parameter;
4, can not be cost under the prerequisite that communication link quality requires guaranteeing with the system capacity loss.
Outer-loop power controlling method after the optimization has significantly effect:
1, relatively carries out the outer-loop power controlling method of link-quality extensive style tolerance, adopt based on BLER and Trch BER and carry out the outer-loop power controlling method that link-quality is estimated, can do whole power control process more exquisitely, effective based on BLER;
2, more reasonably be provided with by the exterior ring power control procedure of optimizing and satisfy the inner loop power controlled target signal-noise ratio threshold SIRtarget that link-quality requires, to satisfy quality requirement but not stay too much surplus be principle, can avoid because of the power control loop joint overall system capacity of containing not in place.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
(4) description of drawings
Fig. 1 is the overall flow of inner loop power control with exterior ring power control;
Fig. 2 is mobile device terminal (UE) receiving and processing device;
Fig. 3 is a transmission channel BER estimation unit;
Fig. 4 is the exterior ring power Control and Optimization flow process based on BLER and Trch BER;
Fig. 5 is the exterior ring power control model based on BLER;
Fig. 6 is the exterior ring power control model based on Trch BER.
(5) embodiment
The present invention relates to a kind of outer-loop power controlling method of optimization, proposed the exterior ring power control model based on Block Error Rate and transmission channel bit error rate, provide the method for measurement and the device of transmission channel bit error rate, is specific embodiment of the present invention below.
For ease of understanding, before specifically describing the present invention, earlier applied environment of the present invention is described.
The present invention relates to 3-G (Generation Three mobile communication system) (3G), in some sub-districts of base station, a plurality of portable terminals the identical time, adopt different spread spectrum code words to communicate simultaneously in identical frequency range.Thereby the N that communicates a simultaneously link, wherein the signal launched of any one communication link all is to disturb for other links, nearly base station terminal is transmitted to signal of base station and may floods base station terminal far away and be transmitted to signal of base station, produces so-called near-far interference.Simultaneously, also affect the reception noise level of each terminal, thereby restricting the capacity of whole communication system.
In order to guarantee power system capacity, carry out reliable multi-user communication, carrying out meticulous, reliable power control is the indispensable functional unit of cdma system.
The control of the power that relates in the 3-G (Generation Three mobile communication system) comprises/control of downlink outer loop power and on/descending inner loop power control.Complete power control flow as shown in Figure 1, uplink power control wherein realizes transmitting power control to travelling carriage by means of the base station to the measurement of correlation of up link; Descending power control realizes the transmitting power of base station is controlled to the measurement of correlation of down link by means of travelling carriage.
Exterior ring power is controlled at wireless network control unit (RNC) 100 to carry out, be mainly used in the up Initial Trans that travelling carriage (UE) 106 is set, or the down initial transmitting power of base station (NodeB) 102,104, and the decision threshold SIRtarget of received signal to noise ratio SIR.
The up link sir measurement is carried out in base station 102; Travelling carriage is carried out the down link sir measurement.
After travelling carriage 106 receivers are handled to received signal by radio frequency/intermediate frequency converting unit 108, demodulation recovers the TPC instruction in base band receiving element RX110, after the TPC instruction that the 112 pairs of travelling carriages in TPC command process unit receive is suitably handled, be used for controlling the transmission power adjustment of travelling carriage transmitter unit TX120, send to then after intermediate frequency/radio frequency converting unit 122 is done respective handling, go out by air interface transmission.
Simultaneously, after the receiving element 110 of travelling carriage, be in the sir measurement unit 114 carry out descending reception sir measurement, in TPC order generation unit 116, generate the power control word then, and be inserted into and send to base station node B in the uplink frame, thereby the transmitting power of control base station node B.
In addition, input processing unit 118 has been controlled the transmission power adjustment of travelling carriage transmitter unit TX120.
Processing and travelling carriage for base station receiver are basic identical, do not give unnecessary details at this.
In the exterior ring power control procedure, very important key element is measurement and the evaluation for communication performance and link-quality, this evaluation is whole power control process (comprising two links of an outer shroud and interior ring) key of success, also directly determines the influence power of exterior ring power control and implements efficient.Because outer shroud is interior ring the adjusting target of signal to noise ratio is set, and this regulates target-dependent in the interpretational criteria of outer shroud for link-quality and communication performance, determining the validity of inner loop power control and the capacity of whole system.
In a word, for science, effectively carry out exterior ring power control, respective receiver need be carried out necessary link quality measurements, estimation and evaluation, and Fig. 2 has provided the receiving and processing device of mobile device terminal (UE)
From the downstream signal of base station after radio transmission arrives UE, at first handle at radio-frequency front-end 201, after RF/IF radio frequency, intermediate frequency converting unit 203 downconvert to Mid Frequency, deliver to A/D AD conversion unit 205 then and be converted to digital baseband signal, then receive in the processing unit 207 and make corresponding Multipath searching, catch, recover after the processing such as tracking, multipath merging, descrambling, despreading and channel estimating the reception data-signal of expectation at rake.After passing through rate-matched processing unit 209 again and carry out matching treatment for the signal (A end) of demodulation output in the receiving terminal, be input to link quality measurements estimation unit 217, be used to estimate current link quality or communication performance, wherein, (D end) delivers to the BER measurement that transmission channel BER estimation unit 211 carries out transmission channel on the one hand, and output is the E end; (B end) delivered to and carried out error rate measurement in the error rate estimation unit 215 after 213 decodings of decoding processing unit (C end) on the other hand.
The structure of transmission channel BER estimation unit shown in Figure 3, measurement elaborates to Trch BER.Data after the rate-matched of rate-matched processing unit 209 outputs, deliver to decoding processing unit 213 earlier and decipher processing (above-mentioned D end), data after will deciphering then are input to carries out the encoding process consistent with transmitting terminal in the coding processing unit 301, the data behind this coding as the estimation of receiving terminal for transmitting terminal coding back data, estimate the transmitting terminal data bit that obtains after the receiving terminal rate-matched again, the data before the decoding deliver to comparison process unit 303, pursue the bit comparison.When the comparison process unit compared, if the data of corresponding bit position are identical, then comparative result was designated as ' 0 '; If the data difference of corresponding bits position, then comparative result is designated as ' 1 '.Then, ' 1 ' number among the statistical comparison result in statistical disposition unit 305, statistics is the number of bit errors of current transmission channel in current measuring period, then in BER lead-out unit 307, calculate the error rate (above-mentioned E end) of current transmission channel in current measuring period, i.e. the error rate=number of bit errors/total bit number.
Fig. 4 has provided the exterior ring power Control and Optimization flow process based on BLER and Trch BER, below in conjunction with flow chart it is done further and explains:
(1) based on the Cyclic Redundancy Check of encoding unit, carry out Block Error Rate (BLER) and measure, can calculate for the number of transport blocks of " 1 " by CRC in statistics certain measuring period of interior each transmission block;
(2) based on the coding and decoding characteristic of encoding unit, carrying out transmission channel bit error rate (Trch BER) estimates, can adopt any in the given two kinds of methods of the present invention, both can adopt and utilize coding and decoding characteristic estimating transmitting terminal data to carry out the method for Bit Error Code Statistics, also can carry out Bit Error Code Statistics by sending known data stream;
(3) be the suitable link-quality evaluation method decision threshold BlerTred of exterior ring power control setting, concrete value for BlerTred can be decided on actual conditions, in general, should select suitable BlerTred, so that additional as what BLER was measured the estimation for Trch BER, purpose is in order to carry out effective link-quality evaluation, to encircle in satisfying under the prerequisite of signal interference ratio requirement, avoid too much surplus, in order to avoid the suppression system capacity as far as possible;
(4) carry out the exterior ring power control model and select,, then enter exterior ring power control model based on BLER if promptly measure BLER greater than thresholding BlerTred; Otherwise, enter exterior ring power control model based on Trch BER.It is different that the difference of these two kinds of patterns is to carry out the foundation of exterior ring power control, when communication link quality is relatively poor, adopts the exterior ring power control model based on BLER, to exterior ring power control the carrying out adjustment of extensive style; And when communication link quality is better, then adopt exterior ring power control model, so that further the becoming more meticulous of exterior ring power control based on Trch BER.Certainly, in communication process, constantly communicate the link-quality evaluation, constantly carry out two kinds of switchings between power control mode;
(5) carry out exterior ring power control procedure under the corresponding modes, carry out and measure BLER or Trch BER adjustment for the SIRtarget thresholding.Certainly, also can adopt any in two kinds of given methods of the present invention, both can adopt judgement mode, also can adopt judgement mode based on probability based on continuous statistics.
Fig. 5 and Fig. 6 elaborate with regard to two kinds of power control modes among Fig. 4 respectively.
Fig. 5 is the exterior ring power control model based on BLER.
Suitable rise count cycle Count11 and downward modulation count cycle Count21 at first are set, and raise thresholding BLERUp and downward modulation thresholding BLERDown, the initial value of SIRtarget is set simultaneously.Next carry out link-quality judgement: if promptly at continuous Count11 in the count cycle, BLER all sets up greater than thresholding BLERUp, then with the predefined rise process that adjusts upward step-length UpStep execution SIRtarget.Certainly, the adjustment of SIRtarget can not exceed given maximum SIRmax; If continuous Count21 downward modulation cycle, BLER all sets up less than BLERDown, then carry out the downward modulation process of SIRtarget with predefined downward adjustment step-length DownStep; If court verdict is other situations of non-above-mentioned two kinds of results, then SIRtarget remains unchanged, and does not carry out adjustment.Certainly, the adjustment of SIRtarget can not exceed given minimum value SIRmin.
In the present embodiment, the continuous several times court verdict that is based in measuring period for the evaluation of BLER all is true, and the evaluation of wherein adjudicating number of times can be by downward modulation, raise counting realizes, adopt the thought of tolerance limit judgement here.
Fig. 6 is the exterior ring power control model based on Trch BER.Suitable rise count cycle Count12 and downward modulation count cycle Count22 at first are set, and raise thresholding BERUp and downward modulation thresholding BERDown, the initial value of SIRtarget is set simultaneously.Next carry out link-quality judgement: if promptly at continuous Count12 in the count cycle, Trch BER all sets up greater than thresholding BERUp, then with the predefined rise process that adjusts upward step-length UpStep execution SIRtarget, certainly, the adjustment of SIRtarget can not exceed given maximum SIRmax; If continuous Count22 downward modulation cycle, Trch BER all sets up less than BERDown, then carry out the downward modulation process of SIRtarget with predefined downward adjustment step-length DownStep; If court verdict is other situations of non-above-mentioned two kinds of results, then SIRtarget remains unchanged, and does not carry out adjustment.Certainly, the adjustment of SIRtarget can not exceed given minimum value SIRmin.
Adopted the method that the BLER judgement is estimated that is similar to for the evaluation of Trch BER in the present embodiment.All be true time at continuous repeatedly court verdict only promptly, thinking just that current target thresholding SIRtarget is provided with can not satisfy the current environment requirement, must adjust, and should make suitable processing.
In above-mentioned two embodiment, owing to consider continuity, gradual and relative stability that exterior ring power control is adjusted for inner loop power Control Parameter SIRtarget, so before making corresponding adjustment, at first need judge whether a plurality of continuous measurement results satisfy the consistency variation of continous-stable in corresponding measuring period, only when repeatedly judgement changes unanimity, just proceed suitable adjustment; Otherwise, remain unchanged.
More than by means of preferred embodiment the present invention is set forth, the engineers and technicians of this area can make various modifications to the present invention under the prerequisite that does not deviate from spirit of the present invention.
Certainly, those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (10)
1, a kind of outer-loop power controlling method of optimization is characterized in that described outer-loop power controlling method comprises:
(1) based on the cyclic redundancy check (CRC) of encoding unit, Block Error Rate is measured;
(2) transmission channel bit error rate is estimated;
(3) be the suitable link-quality evaluation method decision threshold of exterior ring power control setting;
(4) the outer shroud power control mode is selected, when measuring Block Error Rate greater than thresholding, communication link quality is relatively poor, then enters the exterior ring power control model based on Block Error Rate, to exterior ring power control the carrying out adjustment of thick formula; When measuring Block Error Rate less than thresholding, communication link quality is better, then enter exterior ring power control model based on transmission channel bit error rate, so that further the becoming more meticulous of exterior ring power control, in communication process, to constantly communicate the link-quality evaluation, constantly carry out two kinds of switchings between power control mode;
(5) carry out exterior ring power control procedure under the corresponding modes, carry out and measure the adjustment of Block Error Rate, transmission channel bit error rate for target gate.
2, the outer-loop power controlling method of optimization as claimed in claim 1 is characterized in that in the described outer-loop power controlling method (2) transmission channel bit error rate being carried out estimation approach is:
Based on the coding and decoding characteristic estimating transmitting terminal data of encoding unit, carry out transmission channel bit error rate and estimate, specifically adopt following treatment step:
Be used to get after the rate-matched unit, the data before the decoding unit are as the step of the actual reception bit of receiving terminal;
Be used for the reception data that are input to decoding unit are deciphered the step of processing;
Be used for the data of decoding output are added the step of the cyclic redundancy check (CRC) of encoding unit;
Be used for the data after adopting the mode identical with transmitting terminal to cyclic redundancy check (CRC) are encoded, obtain the step of receiving terminal for the estimation of transmitting terminal coded data;
Be used for the reception data of receiving terminal reality and receiving end are pursued bit relatively for the estimation of transmitting terminal coded data, and charge to the step of comparative result, wherein, the corresponding bits position is identical to be designated as ' 0 ', and difference is designated as ' 1 ';
Be used for the step to statistical comparison result ' 1 ' number, statistics is the reception number of bit errors;
Be used for calculating the step of the current transmission channel error rate, i.e. the actual reception bit number of transmission channel bit error rate=reception number of bit errors/receiving terminal.
3, the outer-loop power controlling method of optimization as claimed in claim 1 is characterized in that in the described outer-loop power controlling method (2) transmission channel bit error rate being carried out estimation approach is:
Transmitting terminal sends the known data stream with certain rule, and receiving terminal utilizes known traffic flow information to recover source data, carries out transmission channel bit error rate and estimates.
4, the outer-loop power controlling method of optimization as claimed in claim 1, it is characterized in that execution in the described outer-loop power controlling method (5) measures Block Error Rate and transmission channel bit error rate and be based on the judgement mode of continuous statistics for the method for the adjustment of target gate, promptly estimate the crash consistency that measurement result changes by estimating the continuous several times measurement result.
5, the outer-loop power controlling method of optimization as claimed in claim 1, it is characterized in that carrying out in the described outer-loop power controlling method (5) and measure Block Error Rate or transmission channel bit error rate and be based on the judgement mode of probability, promptly estimate the consistency variation tendency of measurement result by the probability of adding up repeatedly a certain adjustment direction in the measurement result for the method for the adjustment of target gate.
6, the outer-loop power controlling method of optimization as claimed in claim 1 is characterized in that the operation workflow when exterior ring power control model in the described outer-loop power controlling method (4) is the exterior ring power control model that enters based on Block Error Rate comprises:
Suitable rise count cycle and downward modulation count cycle are set;
Be provided with and raise thresholding and downward modulation thresholding;
The initial value of target gate is set;
Carrying out link-quality adjudicates: when when raising in the count cycle for continuous, Block Error Rate is all set up greater than raising thresholding, and then with the predefined rise process that adjusts upward step-length execution target gate, the adjustment of target gate can not exceed given maximum; When reducing in the count cycle for continuous, Block Error Rate is all set up less than raising thresholding, then carries out the downward modulation process of target gate with predefined downward adjustment step-length; When court verdict is other situations of non-above-mentioned two kinds of results, then target gate remains unchanged, and does not carry out adjustment, and the adjustment of target gate can not exceed given minimum value.
7, the outer-loop power controlling method of optimization as claimed in claim 1 is characterized in that in the exterior ring power control model in the described outer-loop power controlling method (4) comprising for the operation workflow that enters based on the exterior ring power control model of transmission channel bit error rate:
Suitable rise count cycle and downward modulation count cycle are set;
Be provided with and raise thresholding and downward modulation thresholding;
The initial value of target gate is set;
Carry out the link-quality judgement: when when raising in the count cycle for continuous, transmission channel bit error rate is all set up greater than thresholding, and then with the predefined rise process that adjusts upward step-length execution target gate, the adjustment of target gate can not exceed given maximum; When reducing in the count cycle for continuous, transmission channel bit error rate is all set up less than the downward modulation thresholding, then carries out the downward modulation process of target gate with predefined downward adjustment step-length; When court verdict is other situations of non-above-mentioned two kinds of results, then target gate remains unchanged, and does not carry out adjustment, and the adjustment of target gate can not exceed given minimum value.
8, a kind of exterior ring power control device of realizing the optimization of claim 1 method, exterior ring power control device are realized ascending exterior ring power control and the control of downlink outer loop power, it is characterized in that described exterior ring power control device comprises:
Wireless network control unit carries out exterior ring power control, is mainly used in the ascending exterior ring power of the initial transmissions that travelling carriage is set, the downlink outer loop power of the initial transmissions of base station, and the target gate of received signal to noise ratio;
Base station 1,2 is carried out signal noise ratio of upper link and is measured, and the base station produces the power control word according to the comparison court verdict of measuring with target gate, and sends to travelling carriage in downlink frame, to carry out uplink power control; Travelling carriage produces the power control word according to the comparison court verdict of measuring signal to noise ratio and thresholding, and sends to the base station in uplink frame, to carry out descending power control;
Travelling carriage, carry out the down link snr measurement, after mobile station receiver is handled to received signal by the radio frequency/intermediate frequency converting unit, demodulation recovers power control word (TPC) instruction in base band receiving element RX, after the power control word instruction that TPC command process unit receives travelling carriage is suitably handled, be used for controlling the transmission power adjustment of travelling carriage transmitter unit TX, send to then after intermediate frequency/the radio frequency converting unit is done respective handling, go out by air interface transmission; Simultaneously, after the receiving element RX of travelling carriage, carry out descending received signal to noise ratio in the sir measurement unit and measure, in TPC order generation unit, generate the power control word then, and be inserted into and send to the base station in the uplink frame, thus the transmitting power of control base station; Input processing unit has been controlled the transmission power adjustment of travelling carriage transmitter unit TX.
9, the exterior ring power control device of optimization as claimed in claim 8 is characterized in that the device of the receiver of described travelling carriage comprises:
Radio-frequency front-end is handled after radio transmission arrives travelling carriage the downstream signal from the base station;
RF/IF radio frequency, intermediate frequency converting unit, with the signal frequency conversion after handling to Mid Frequency;
The A/D AD conversion unit is converted to digital baseband signal with the intermediate-freuqncy signal after the conversion;
Search receives processing unit, this digital baseband signal is made corresponding Multipath searching, catch, follow the tracks of, multipath merges, descrambling, recover the reception data-signal of expectation after the processing such as despreading and channel estimating, after carrying out matching treatment through the rate-matched processing unit again for the signal of demodulation output in the receiving terminal, be input to the link quality measurements estimation unit, be used to estimate current link quality or communication performance, wherein, delivering to the transmission channel estimation unit on the one hand measures transmission channel bit error rate, after the decoding of decoding processing unit, deliver in the Block Error Rate estimation unit on the other hand Block Error Rate? measure.
10, the exterior ring power control device of optimization as claimed in claim 9 is characterized in that the device of described transmission channel BER estimation unit comprises:
The decoding processing unit is deciphered processing to the rate-matched data of described rate-matched processing unit output;
Coding processing unit is carried out the encoding process consistent with transmitting terminal with the data after the decoding, the estimation of data after the data behind this coding are encoded for transmitting terminal as receiving terminal;
The comparison process unit, data after the estimation of transmitting terminal data bit and receiving terminal rate-matched that obtain, before the decoding are pursued bit relatively, when comparing, if the data of corresponding bit position are identical, then comparative result is designated as ' 0 ', if the data difference of corresponding bits position, then comparative result is designated as ' 1 ';
The statistical disposition unit, ' 1 ' number among the statistical comparison result, statistics is the number of bit errors of current transmission channel in current measuring period;
The BER lead-out unit calculates the error rate of current transmission channel in current measuring period, i.e. the error rate=number of bit errors/total bit number.
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| CNB021451281A CN100393008C (en) | 2002-11-08 | 2002-11-08 | Optimized method for controlling outer ring power and device |
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| CNB021451281A CN100393008C (en) | 2002-11-08 | 2002-11-08 | Optimized method for controlling outer ring power and device |
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| CN100362769C (en) * | 2004-06-30 | 2008-01-16 | 华为技术有限公司 | External circule power control method in CDMA communication system |
| CN101138171A (en) * | 2005-03-09 | 2008-03-05 | 日本电气株式会社 | Measuring received signal quality |
| CN1968037B (en) * | 2006-06-09 | 2010-10-06 | 华为技术有限公司 | Power control method in communication method and its system |
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| CN103068025A (en) * | 2011-10-18 | 2013-04-24 | 联芯科技有限公司 | Outer loop power control method and terminal |
| CN102647776B (en) * | 2007-01-31 | 2014-08-27 | 电信科学技术研究院 | Method and device for outer loop power control of enhanced physical uplink channel |
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