CN102711230A

CN102711230A - PRACH (Physical Random Access Channel) power self-adaption optimization adjusting method, system and base station

Info

Publication number: CN102711230A
Application number: CN2012102053729A
Authority: CN
Inventors: 刘梅红
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2012-06-20
Filing date: 2012-06-20
Publication date: 2012-10-03
Anticipated expiration: 2032-06-20
Also published as: CN102711230B

Abstract

The invention discloses a PRACH (Physical Random Access Channel) power self-adaption optimization adjusting method, a system and a base station. The method comprises the steps of detecting and recording the number of failed UE (User Equipment) accessed to an E-UTRAN (Evolved UMTS Terrestrial Radio Access Network) by the base station, and calculating the probability of failure of UE accessed into the E-UTRAN; judging whether a current precursor initial target power value of the PRACH is the optimal power value or not according to the probability of failure; if the current precursor initial target power value is the optimal power value, reporting the precursor initial target power value to an OMC (Operation Maintenance Center); and adjusting the precursor initial target power value of the PRACH in a self-adaption manner by the base station according to the judgment result returned by the OMC. The system comprises the base station and the OMC. According to the method, the system and the base station, the traditional manual configuration and maintenance are replaced, the power of the PRACH is adjusted dynamically, the network maintenance cost is lowered, the random accessing success rate of the UE is improved, the power consumption and the interference of the UE are reduced, and the random access delay of the UE is improved.

Description

Method, system and base station that a kind of PRACH power adaptive is optimized and revised

Technical field

The present invention relates to the mobile communication technology field, be specifically related to method, system and base station that a kind of PRACH power adaptive is optimized and revised.

Background technology

At LTE (Long Term Evolution; Long Term Evolution) in the mobile communcations system; UE (User Equipment; Subscriber equipment) initiates random access procedure through PRACH (Physical Random Access Channel, Physical Random Access Channel) to E-UTRAN (Evolved UMTS Terrestrial Radio Access Network, the land radio access web of evolution).In order to let the base station correctly detect the random access information that UE transmits at PRACH, need carry out power control to the leading initial target power of the PRACH of UE.

Wherein the leading received power PREAMBLE_RECEIVED_TARGET_POWER of the PRACH of the MAC of UE (Media Access Control, media interviews control) calculating is:

P _N-PRACH＝{P _{O_PRE}+Δ _PREAMBLE+ΔP _rampup}dBm

Wherein, P _{O_PRE}Be the leading initial target power of PRACH of Cell Broadcast CB; Δ _PREAMBLEBe power deviation based on leading form; Δ P _RampupThe gross power that random access guiding rose of expression from the random access guiding of first transmission to a last transmission, Δ P _Rampup=(N _PRE-1) * dP _Rampup, N _PREBe the actual trial of PRACH emitting times, dP _RampupBe the power ramp step-length, N _PREAnd dP _RampupAll give UE through Cell Broadcast CB.

Network side is through the leading initial target power P of control _{O_PRE}, and then the transmitting power that inserts at random of control UE, the access success rate at random of assurance UE.Generally, network design initial stage, leading initial target power P _{O_PRE}Through OMC it is configured initial value; And in the process of network O&M, constantly repeatedly carry out manual adjustment according to actual conditions, can't reduce O&M cost, and be difficult to avoid power jitter; Because the power adjustment to PRACH is not fine, causes and has reduced the success rate that UE inserts at random.

Summary of the invention

The technical issues that need to address of the present invention provide method, system and the base station that a kind of PRACH power adaptive is optimized and revised; To reduce the cost of network O&M; Improve the success rate that UE inserts at random, and guarantee the rational power control that network side inserts UE at random.

In order to solve the problems of the technologies described above, the invention provides the method that a kind of PRACH power adaptive is optimized and revised, comprising:

The number of the user equipment (UE) that the land radio access web E-UTRAN of base station detection and statistics access evolution once failed, and calculate the probability of failure P that UE inserts E-UTRAN _Preamble

Insert the probability of failure P of E-UTRAN according to said UE _PreambleWhether the value of the leading initial target power that judgement Physical Random Access Channel PRACH is current is the optimal power value;

If be the optimal power value, value that then will this leading initial target power reports the OMC of operation maintenance center;

The court verdict that the base station is returned according to said OMC is adjusted the leading initial target power of said PRACH adaptively.

Further, said base station is detected and the number of the UE that statistics access E-UTRAN once failed, and calculates the probability of failure P that UE inserts E-UTRAN _Preamble, comprising:

Said base station is provided with sense cycle timer, sense cycle and UE number statistical variable;

Said base station when detecting the UE of access failure once, adds 1 with said UE number statistical amount in sense cycle; When said sense cycle timer arrives sense cycle, judge whether the value of said UE number statistical variable reaches preset thresholding, if reach preset thresholding, then calculate the probability of failure P that said UE inserts E-UTRAN _Preamble, otherwise restart to detect and add up the number that inserts the UE that E-UTRAN once failed.

Said base station is according to the number of the UE that once failed of access E-UTRAN of statistics and the probability of failure P of the said UE access of the ratio calculation E-UTRAN of the UE sum of current access _Preamble

Said base station is provided with sense cycle timer Timer _RO, sense cycle and UE number statistical variable NumUE _RO

Said base station is sent UEInformationRequest to UE and is inserted request message, and the cell rach-ReportReq-r9 that carries in the said access request message is changed to true; And receive the UEInformationResponse that said UE returns and insert response message;

The said UEInformationResponse of said base station judges inserts whether the cell contentionDetected-r9 that carries in the response message is false; If, then with said UE number statistical variable NumUE _ROAdd 1, and preserve the value that said UEInformationResponse inserts the cell numberOfPreambleSent-r9 that carries in the response message; Otherwise, abandon the statistical information of this UE;

When said sense cycle timer arrives sense cycle, judge said NumUE _ROWhether reach UE number predetermined threshold value Threshold _UEIf, reach, then calculate the probability of failure P that said UE inserts E-UTRAN through following formula _Preamble:

P _preamble＝∑N _{(numberOfPreambleSent-r9！＝1)}/∑N _total，

Wherein, ∑ N _TotalUE total number for current access E-UTRAN; ∑ N ₌ ₁₎Among the UE for current access E-UTRAN, cell numberOfPreambleSent-r9 value is not 1 UE number;

If NumUE _RODo not reach said UE number predetermined threshold value Threshold _UE, then this testing process stops, with sense cycle timer Timer _RO, UE number statistical amount NumUE _ROPut 0, said base station is restarted to detect and add up the number that inserts the UE that E-UTRAN once failed and is calculated the probability of failure P that said UE inserts E-UTRAN _PreambleSaid process.

Further, at the probability of failure P that inserts E-UTRAN according to said UE _PreambleWhether the value of adjudicating the current leading initial target power of said PRACH is before the optimal power value, also comprises and calculates the current leading initial target power of said PRACH, specifically comprises:

Insert the probability of failure P of E-UTRAN as said UE _PreambleLess than the preset thresholding Threshold of probability of failure _{P (preamble)}The time, the value of the leading initial target power that said PRACH is current is that the value of the leading initial target power of the OMC of operation maintenance center initial configuration deducts 2dB _m

Otherwise the value of the leading initial target power that said PRACH is current is that the value of the leading initial target power of said OMC initial configuration adds adjustment step delta step;

Wherein, said adjustment step delta step is with | P _Preamble-Threshold _{P (preamble)}| insinuate soaring step-length dP _RampupSpan { the 2dB that allows _m, 4dB _m, 6dB _mIn the set and the value that obtains.

Further, the said probability of failure P that inserts E-UTRAN according to said UE _PreambleWhether the value of adjudicating the current leading initial target power of said PRACH is the optimal power value, comprising:

Detect and after statistics inserts the number of the UE that E-UTRAN once failed and calculate the value of the current leading initial target power of said PRACH in the first round, the mode through broadcasting is to all current said leading initial target power of UE broadcasting in sub-district; Beginning second then takes turns and detects and statistics inserts the number of the UE that E-UTRAN once failed; And after calculating the value of said PRACH current leading initial target power in second takes turns; Mode through broadcasting is broadcasted current said leading initial target power to all UE in sub-district, repeats the process of the leading initial target power of above-mentioned detection statistics and calculating PRACH;

When following situation occurring, the value of current said leading initial target power is the optimal power value:

In first round detection statistics and calculate in the process of leading initial target power of PRACH said P _Preamble＞=Threshold _{P (preamble)}, up to follow-up certain take turns detection statistics and calculate in the process of leading initial target power of PRACH and occur P first _Preamble＜Threshold _{P (preamble)}Situation the time;

Perhaps, P when first round detection and optimizing process _Preamble＜Threshold _{P (preamble)}, up to follow-up certain take turns detection statistics and calculate in the process of leading initial target power of PRACH and occur P first _Preamble＞=Threshold _{P (preamble)}Situation the time.

Further, the court verdict that said base station is returned according to said OMC is adjusted the leading initial target power of said PRACH adaptively, comprising:

The court verdict that returns as said OMC is that the data synchronization request that OMC sends, the value of the leading initial target power that the said PRACH that comes into force is current are received in the base station when admitting this PRACH power adjustment;

The court verdict that returns as said OMC is that the power rollback request that OMC sends is received in the base station, then carries out the rollback process of PRACH power adjustment when vetoing this PRACH power adjustment.

Further, said method also comprises: the value of the leading initial target power of the last PRACH power adjustment said PRACH in back is write down in said base station;

The rollback process of PRACH power adjustment is carried out in said base station, comprising:

If PRACH power adjustment process is a power ramp, 2dBm is reduced with the value of the leading initial target power of the last PRACH power adjustment said PRACH in back in then said base station; Otherwise said base station is adjusted into the leading initial target power of current PRACH the value of the leading initial target power of the last PRACH power adjustment said PRACH in back; The leading initial target power of then, broadcasting current said PRACH to all UE in sub-district through the mode of broadcasting.

In order to solve the problems of the technologies described above, the present invention also provides a kind of base station, comprising:

Physical Random Access Channel PRACH access failure detection module is used to detect and add up the number of the user equipment (UE) that the land radio access web E-UTRAN that inserts evolution once failed, and calculates the probability of failure P that UE inserts E-UTRAN _Preamble

PRACH power optimized judging module is used for the probability of failure P according to said UE access E-UTRAN _PreambleWhether the value of the leading initial target power that judgement Physical Random Access Channel PRACH is current is the optimal power value, and court verdict is sent to PRACH optimal power reporting module;

PRACH optimal power reporting module, if the value of the court verdict that is used for the receiving leading initial target power that to be PRACH current is the optimal power value, value that then will this leading initial target power reports the OMC of operation maintenance center;

PRACH self adaptation adjusting module, the court verdict that is used for returning according to said OMC are adjusted the leading initial target power of said PRACH adaptively.

Further, said PRACH access failure detection module is used to detect and add up the number of the user equipment (UE) that the land radio access web E-UTRAN that inserts evolution once failed, and calculates the probability of failure P that UE inserts E-UTRAN _Preamble, comprising:

Sense cycle timer, sense cycle and UE number statistical variable are set;

In sense cycle, when detecting the UE of access failure once, UE number statistical amount is added 1; When said sense cycle timer arrives sense cycle, judge whether the value of said UE number statistical variable reaches preset thresholding, if reach preset thresholding, then calculate the probability of failure P that said UE inserts E-UTRAN _Preamble, otherwise restart to detect and add up the number that inserts the UE that E-UTRAN once failed.

Further, said PRACH access failure detection module is used to calculate the probability of failure P that UE inserts E-UTRAN _Preamble, comprising:

According to the number of the UE that once failed of access E-UTRAN of statistics and the probability of failure P of the said UE access of the ratio calculation E-UTRAN of the UE sum of current access _Preamble

Further, said PRACH access failure detection module is used to detect and add up the number that inserts the UE that E-UTRAN once failed, and calculates the probability of failure P that UE inserts E-UTRAN _Preamble, comprising:

Sense cycle timer Timer is set _RO, sense cycle and UE number statistical variable NumUE _RO

Send UEInformationRequest to UE and insert request message, the cell rach-ReportReq-r9 that carries in the said access request message is changed to true; And receive the UEInformationResponse that said UE returns and insert response message;

Judge that said UEInformationResponse inserts whether the cell contentionDetected-r9 that carries in the response message is false; If, then with said UE number statistical variable NumUE _ROAdd 1, and preserve the value that said UEInformationResponse inserts the cell numberOfPreambleSent-r9 that carries in the response message; Otherwise, abandon the statistical information of this UE;

P _preamble＝∑N _{(numberOfPreambleSent-r9！＝l)}/∑N _total，

If NumUE _RODo not reach said UE number predetermined threshold value Threshold _UE, then this testing process stops, with sense cycle timer Timer _RO, UE number statistical amount NumUE _ROPut 0, restart to detect and add up the number that inserts the UE that E-UTRAN once failed then and calculate the probability of failure P that said UE inserts E-UTRAN _PreambleSaid process.

Further, said PRACH power optimized judging module also is used at the probability of failure P that inserts E-UTRAN according to said UE _PreambleWhether the value of adjudicating the current leading initial target power of said PRACH is before the optimal power value, calculates the current leading initial target power of said PRACH, specifically comprises:

Further, said PRACH power optimized judging module is used for the probability of failure P according to said UE access E-UTRAN _PreambleWhether the value of adjudicating the current leading initial target power of said PRACH is the optimal power value, comprising:

Detect and after statistics inserts the number of the UE that E-UTRAN once failed and calculate the value of the current leading initial target power of said PRACH in the first round, the mode through broadcasting is to all current said leading initial target power of UE broadcasting in sub-district; Notifying said PRACH access failure detection module to begin second then takes turns and detects and statistics inserts the number of the UE that E-UTRAN once failed; And after calculating the value of said PRACH current leading initial target power in second takes turns, broadcast current said leading initial target power to all UE in sub-district through the mode of broadcasting;

Repeat above-mentioned detection statistics and calculate in the process of leading initial target power of PRACH in said PRACH access failure detection module and said PRACH power optimized judging module; When said PRACH power optimized judging module was judged the following situation of appearance, the value of current said leading initial target power was the optimal power value:

Perhaps, P when first round detection and optimizing process _Preamble＜Threshold _{P (preamble)}, up to follow-up certain take turns detection statistics and calculate in the process of leading initial target power of PRACH and occur P first _Preamble＞=Threshold _{P (preamble)}Situation the time;

Said PRACH access failure detection module also is used for after the notice of receiving said PRACH power optimized judging module, restarts to detect and add up the number that inserts the UE that E-UTRAN once failed, and calculates the probability of failure P that UE inserts E-UTRAN _Preamble

Further, said PRACH self adaptation adjusting module, the court verdict that is used for returning according to said OMC are adjusted the leading initial target power of said PRACH adaptively, comprising:

The court verdict that returns as said OMC is that said PRACH self adaptation adjusting module is received the data synchronization request that OMC sends, the value of the leading initial target power that the said PRACH that comes into force is current when admitting this PRACH power adjustment;

The court verdict that returns as said OMC is that said PRACH self adaptation adjusting module is received the power rollback request that OMC sends, and then carries out the rollback process of PRACH power adjustment when vetoing this PRACH power adjustment.

Further, said PRACH self adaptation adjusting module also is used to write down the value that last PRACH power is adjusted the leading initial target power of the said PRACH in back;

Said PRACH self adaptation adjusting module is used to carry out the rollback process that PRACH power is adjusted, and comprising:

If PRACH power adjustment process is a power ramp, then said PRACH self adaptation adjusting module reduces 2dBm with the value of the leading initial target power of the last PRACH power adjustment said PRACH in back; Otherwise said PRACH self adaptation adjusting module is adjusted into the leading initial target power of current PRACH the value of the leading initial target power of the last PRACH power adjustment said PRACH in back; The leading initial target power of then, broadcasting current said PRACH to all UE in sub-district through the mode of broadcasting.

In order to solve the problems of the technologies described above, the system that the present invention also provides a kind of PRACH power adaptive to optimize and revise comprises aforesaid base station and the OMC of operation maintenance center.

Compared with prior art, method, system and base station that PRACH power adaptive provided by the invention is optimized and revised are initially built period at network, have realized the automatic configuration of PRACH power; And the self adaptation adjustment of later stage PRACH power during network operation; Substitute traditional-handwork configuration and maintenance thereof, greatly reduced the cost of network O&M; Secondly, realized statistical information, dynamically adjusted the power of PRACH, greatly improved the success rate that UE inserts at random through the telephone traffic of network real-time; In addition,, also can reduce UE power consumption and interference thereof, improve the access delay at random of UE through the adaptive power adjustment.

Description of drawings

Fig. 1 is the system construction drawing that the PRACH power adaptive is optimized and revised;

Fig. 2 is the method flow diagram that the PRACH power adaptive is optimized and revised among the embodiment;

Fig. 3 is that base station eNodeB is opened PRACH power control optimization testing process figure in the applying examples.

Embodiment

For making the object of the invention, technical scheme and advantage clearer, hereinafter will combine accompanying drawing that embodiments of the invention are elaborated.Need to prove that under the situation of not conflicting, embodiment among the application and the characteristic among the embodiment be combination in any each other.

Embodiment:

System as shown in Figure 1, that present embodiment provides a kind of PRACH power adaptive to optimize and revise comprises base station and the OMC of operation maintenance center, and wherein, the base station comprises:

PRACH access failure detection module is used to detect and add up the number that inserts the UE that E-UTRAN once failed, and calculates the access failure probability P that UE inserts E-UTRAN _Preamble

PRACH power optimized judging module is used for the probability of failure P according to said UE access E-UTRAN _PreambleWhether the value of the leading initial target power that judgement PRACH is current is the optimal power value, and court verdict is sent to PRACH optimal power reporting module;

Wherein, said PRACH access failure detection module is used to detect and add up the number of the user equipment (UE) that the land radio access web E-UTRAN that inserts evolution once failed, and calculates the probability of failure P that UE inserts E-UTRAN _Preamble, comprising:

Sense cycle timer, sense cycle and UE number statistical variable are set;

In sense cycle, when detecting the UE of access failure once, UE number statistical amount is added 1; When said sense cycle timer arrives sense cycle, judge whether the value of said UE number statistical variable reaches preset thresholding, if reach preset thresholding, then calculate the probability of failure P that said UE inserts E-UTRAN _Preamble, otherwise restart to detect and add up the number that inserts the UE that E-UTRAN once failed;

Said PRACH access failure detection module is according to the number of the UE that once failed of access E-UTRAN of statistics and the probability of failure P of the said UE access of the ratio calculation E-UTRAN of the UE sum of current access _Preamble

As a kind of preferred mode, said PRACH access failure detection module is used to detect and add up the number that inserts the UE that E-UTRAN once failed, and calculates the probability of failure P that UE inserts E-UTRAN _Preamble, comprising:

Send UEInformationRequest to UE and insert request message, the cell rach-ReportReq-r9 that carries in the said message is changed to true; And receive the UEInformationResponse that said UE returns and insert response message;

P _preamble＝∑N _{(numberOfPreambleSent-r9！＝1)}/∑N _total，

Wherein, ∑ N _TotalUE total number for current access; ∑ N ₌₁₎Among the UE for current access, cell numberOfPreambleSent-r9 value is not 1 UE number;

Wherein, said PRACH power optimized judging module also is used at the probability of failure P that inserts E-UTRAN according to said UE _PreambleWhether the value of adjudicating the current leading initial target power of said PRACH is before the optimal power value, calculates the current leading initial target power of said PRACH, specifically comprises:

Said PRACH power optimized judging module is used for the probability of failure P according to said UE access E-UTRAN _PreambleWhether the value of adjudicating the current leading initial target power of said PRACH is the optimal power value, comprising:

Wherein, said PRACH self adaptation adjusting module, the court verdict that is used for returning according to said OMC are adjusted the leading initial target power of said PRACH adaptively, comprising:

In addition, said PRACH self adaptation adjusting module also is used to write down the value that last PRACH power is adjusted the leading initial target power of the said PRACH in back;

Method as shown in Figure 2, that present embodiment provides a kind of PRACH power adaptive to optimize and revise may further comprise the steps:

S101: base station eNodeB is opened PRACH power optimization adjustment testing process, is specially: the number of the UE that detection and statistics access E-UTRAN once failed, and calculate the probability of failure P that UE inserts E-UTRAN _Preamble

S102: the probability of failure P that inserts E-UTRAN according to said UE _PreambleWhether the value of the leading initial target power that judgement PRACH is current is the optimal power value;

S103: if be the optimal power value, value that then will this leading initial target power reports the OMC of operation maintenance center;

The court verdict that S104:eNodeB returns according to said OMC is adjusted the leading initial target power of said PRACH adaptively.

In step S101; ENodeB can detect the once UE and the once successful UE that inserts of access failure; Wherein, Once the UE of access failure comprised: because low excessively causing of power inserted the UE of E-UTRAN failure and the UE of non-power reason access failure, and what add up in the present embodiment mainly is to cause the number of the UE of access failure because power crosses low.

The number that the base station is detected and statistics inserts the UE that E-UTRAN once failed can have multiple mode to realize, wherein, and as a kind of preferred mode:

Said base station when detecting the UE of access failure once, adds 1 with UE number statistical amount in sense cycle; When said sense cycle timer arrives sense cycle, judge whether the value of said UE number statistical variable reaches preset thresholding, if reach preset thresholding, then calculate the probability of failure P that said UE inserts E-UTRAN _Preamble, otherwise restart to detect and add up the number that inserts the UE that E-UTRAN once failed.

Certainly, also preset thresholding can be set, all that obtain with the statistics once number of the UE of access failure remove to calculate the probability of failure P that said UE inserts E-UTRAN _Preamble

In addition; Also can be through the base station to the UE sending measuring information statistics of sampling; Obtain the number of the UE of access failure; The base station need comprise at least to the metrical information that UE issues this insert retry how many times just insert essential informations such as success (that is the number of times that, once took defeat) and current power value; UE returns the leading initial target performance number of its PRACH to the base station then; And the number of times of failure retry; Then the base station also can be according to the probability of failure of these information calculations UE access; Certain this statistical method need increase additional message, if message is lost phenomenon, it is not very accurate then causing statistics.

Wherein, the probability of failure P of said UE access E-UTRAN is calculated according to the number of the UE that once failed of access E-UTRAN of statistics and the ratio of the UE sum of current access in said base station _Preamble, that is, and P _Preamble,=access failure number/access sum.

In an applying examples, as a kind of preferred mode, utilize the agreement cell among the Release9, accomplish the statistics that UE is inserted the E-UTRAN failure, as shown in Figure 3, specifically comprise the steps:

S201:eNodeB is provided with sense cycle timer Timer _RO, UE number statistical variable NumUE _ROBe 0, and sense cycle is set;

S202:UE initiates random access procedure through PRACH, inserts eNodeB;

S203:eNodeB sends UEInformationRequest to UE and inserts request message, and the cell rach-ReportReq-r9 that carries in this message is changed to true;

S204:eNodeB receives that the UEInformationResponse that UE returns inserts response message;

S205:eNodeB judges that UEInformationResponse inserts whether the cell contentionDetected-r9 that carries in the response message is false, if, execution in step S207 then; Otherwise, execution in step S206;

Wherein, UEInformationResponse inserts in the response message and carries cell contentionDetected-r9 and cell numberOfPreambleSent-r9.Wherein, the numberOfPreambleSent-r9 representative attempts inserting number of times, and numberOfPreambleSent-r9 is that 1 explanation once promptly inserts successfully, and power is low excessively to lead to the failure and have, and the access attempts number of times of this moment is just necessarily greater than 1.Cell contentionDetected-r9 is false, representes that this UE once caused inserting the E-UTRAN failure because power hangs down excessively, at this moment; UE number statistical variable should add 1; If cell contentionDetected-r9 is ture, explain that the UE access failure does not have the power reason, for example the other reasonses such as sequence code conflict between UE cause; It doesn't matter with the power adjustment, and this type of message just need not participated in statistics.This algorithm is only adjusted the access attempts number of times greater than 1 time and cross the UE number that low reason leads to the failure because of power.Be that contentionDetected-r9 is false, attempt this moment inserting frequency n umberOfPreambleSent-r9 also greater than 1.

S206:, then abandon the statistical information of this UE if be ture;

S207: with UE number statistical variable NumUE _RO+ 1, and preserve the value that UEInformationResponse inserts the cell numberOfPreambleSent-r9 that carries in the response message;

S208: when said sense cycle timer arrives sense cycle, judge NumUE _ROWhether reach UE number predetermined threshold value Threshold _UE,, if reach then execution in step S209; Otherwise this testing process stops, and returns step S201, with sense cycle timer Timer _RO, UE number statistical amount NumUE _ROPut 0, open new one and take turns the testing process that UE inserts at random;

S209: calculate the probability of failure P that UE inserts E-UTRAN through following formula _Preamble:

P _preamble＝∑N _{(numberOfPreambleSent-r9！＝1)}/∑N _total，

Wherein, ∑ N _TotalUE total number for current access E-UTRAN; ∑ N ₌₁₎Among the UE for current access E-UTRAN, cell numberOfPreambleSent-r9 value is not 1 UE number, that is, because the low excessively UE number that causes inserting the E-UTRAN failure of power).

Should use in the example; Utilize the R9 agreement to have cell; Completion is accurate and efficient to the statistics that UE inserts the E-UTRAN failure; Can measure and add up the access information of network real-time, make things convenient for the leading access power of subsequent dynamic ground adjustment PRACH, and then improved the success rate that UE inserts at random.

In step S102, before whether the value of the current leading initial target power of the said PRACH of judgement is the optimal power value, also comprises and calculate the current leading initial target power of said PRACH, specifically comprise:

Work as P _Preamble＜Threshold _{P (preamble)}The time, the value of the leading initial target power that said PRACH is current be the OMC initial configuration leading initial target received power deduct 2dBm; Wherein, Threshold _{P (preamble)}It is the preset thresholding of probability of failure;

Wherein, according to | P _Preamble-Threshold _{P (preamble)}| difference, calculate the value of Δ step, the computational methods of Δ step are following:

Δstep＝f(|P _preamble-Threshold _P(preamble)|)，

Wherein f is one and insinuates function, will | P _Preamble-Threshold _{P (preamble)}| insinuate soaring step-length dP _RampupSpan { the 2dB that allows _m, 4dB _m, 6dB _mIn the set, promptly the value of Δ step is confirmed at these three numerical value { 2dB _m, 4dB _m, 6dB _mIn one on, difference is big more, the value of the adjustment step delta step that insinuates is big more.

In step S102, as a kind of preferred mode, whether the value that the current leading initial target power of said PRACH is adjudicated in the base station is the optimal power value, comprising:

For top first kind of situation, the leading initial target power of PRACH is according to P _PreambleAfter the self adaptation adjustment constantly, be broadcast to all UE in sub-district, UE attempts inserting E-UTRAN once more according to this new leading initial target power; In this process; The failure access probability of UE is by high step-down, and it is high that failure inserts probability, explains that leading initial target power is low excessively; Need heighten, adjust to the failure access probability always and be lower than Threshold first _{P (preamble)}The time, explain that current leading initial target power temporarily is optimum;

For top second kind of situation, the first round, the failure access probability of UE was too low, is lower than Threshold when detecting _{P (preamble)}, explain that current leading initial target power is too high, though the access rate of UE is high; But power is too high also is a kind of waste; Cause the terminal power consumption fast,, adjust to the failure access probability always and be higher than Threshold first so need leading initial target power be turned down _{P (preamble)}The time, explain that current leading initial target power temporarily is optimum.

To above-mentioned two kinds of situation, Threshold _{P (preamble)}Value be the same, this value is a metric of on webmaster, joining, so twice comparative standard is the same.

Certainly; Whether the value that the base station also can adopt other modes to adjudicate the current leading initial target power of said PRACH is the optimal power value, for example, the minimum and peak power thresholding of the leading initial target power of PRACH is set on webmaster; Then; The automatic leading initial target power of adjustment PRACH in this scope, the leading initial target power of adjusted PRACH is minimum can not to be lower than the lowest power thresholding, the highlyest can not be higher than the peak power thresholding.

In step S103, if be the optimal power value, the value of then will this leading initial target accepting power reports the OMC of operation maintenance center; Otherwise the PRACH power adjustment process of a new round will be opened in the base station, for example, and with sense cycle timer Timer _RO, detect UE number statistical amount NumUE _ROPut 0, open new one and take turns the statistics that UE is inserted the E-UTRAN failure;

After having produced the optimal power value, eNodeB simple structure Network Management Protocols SNMP trap message reports OMC with this optimal power value; After OMC receives this trap message, adjudicate the reasonability of this optimal power value; Wherein, OMC for example can increase when the reasonability of the performance number of judgement PRACH, the decision mechanisms such as experience library searching algorithm of free schema, controlled mode and PRACH optimal power value, wherein,

Free schema: OMC acquiescence is accepted the optimal power value that the base station reports, and is as the criterion with the base station value of reporting, and upgrades the current storing value of OMC;

Controlled mode: on OMC, provide to report the control point, after the base station reported the optimal power value, prompting let user's manual confirmation on the interface, can select to accept or refuse this and optimize and revise;

Experience storehouse mode: relative complex, need be at a whole set of complete empirical value of OMC side storage, this cover relation value is according to protracted experience accumulation foundation.For example, in a certain moment of every day, for what UE scopes, the optimal power value of suggestion PRACH should in what scope, and whether the value that the base station reports meets this area requirement, then can adjudicate the reasonability of this performance number.

If OMC admits this PRACH power adjustment, then send data synchronization request message to eNodeB; If veto this PRACH power adjustment, then send PRACH power rollback request message to eNodeB.

In step S104, the court verdict that returns as said OMC is that the data synchronization request that OMC sends, the value of the leading initial target power that the said PRACH that comes into force is current are received in the base station when admitting this PRACH power adjustment;

Here, can manual synchronization after all to this leading initial target power of UE broadcasting, also can be after receiving said data synchronization request with current PRACH power ratio, if unanimity then do not broadcast;

Carry out the rollback process of PRACH power adjustment, specifically comprise:

If PRACH power adjustment process is a power ramp, 2dB is reduced with the value of the leading initial target power of the last PRACH power adjustment said PRACH in back in then said base station _mOtherwise said base station is adjusted into the leading initial target power of current PRACH the value of the leading initial target power of the last PRACH power adjustment said PRACH in back; The leading initial target power of then, broadcasting current said PRACH to all UE in sub-district through the mode of broadcasting.

Said method also comprises: the value of the leading initial target power of the last PRACH power adjustment said PRACH in back is write down in said base station;

Here, the value of the leading initial target power of the last PRACH power adjustment said PRACH in back has been write down in said base station, therefore, is foundation with last optimal power value during rollback, and eNodeB judges that rolling back action is to increase power, still reduces performance number; If judgement is for reducing performance number, then with last optimal power value-2dB _mIf judgement then rolls back to the adjusted value of last power with performance number along optimization historical record before for increasing performance number; Then, the value of the leading initial target power of the PRACH of sub-district after all UE broadcasting rollbacks; At last, the PRACH power adjustment process of a base station initiated new round.

Can find out that from the foregoing description with respect to prior art, method, system and base station that the PRACH power adaptive that provides in the foregoing description is optimized and revised are initially built period at network, have realized the automatic configuration of PRACH power; And the self adaptation adjustment of later stage PRACH power during network operation; Substitute traditional-handwork configuration and maintenance thereof, greatly reduced the cost of network O&M; Secondly; Go into the UE number of failure based on the cell information butt joint of R9 agreement itself and add up, not only accurately but also efficient, the UEInformationResponse that promptly returns to the base station according to UE inserted the cell value of carrying in the response message; The UE number of statistics access network failure; Realized statistical information, dynamically adjusted the power of PRACH, greatly improved the success rate that UE inserts at random through the telephone traffic of network real-time; In addition, introduce parameters such as sense cycle timer, sense cycle and UE number statistical amount, when dynamically adjusting the power of PRACH, can not adjust continually, thereby in relative time length, kept optimal value to avoid power jitter; In addition; If UE wants access base station, access attempts does not repeatedly all have successfully and when sending a certain performance number always, is suitable power consumption; And through the adaptive power adjustment; Also can reduce UE power consumption and interference thereof, improve the access delay at random of UE, and complete algorithm and the flow process of the present invention when the power rollback also is provided.

One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to accomplish through program, said program can be stored in the computer-readable recording medium, like read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.

The above is merely the preferred embodiments of the present invention, is not to be used to limit protection scope of the present invention.According to summary of the invention of the present invention; Also other various embodiments can be arranged; Under the situation that does not deviate from spirit of the present invention and essence thereof, those of ordinary skill in the art are when making various corresponding changes and distortion according to the present invention, and are all within spirit of the present invention and principle; Any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. method that the PRACH power adaptive is optimized and revised comprises:

2. the method for claim 1 is characterized in that:

Said base station is detected and the number of the UE that statistics access E-UTRAN once failed, and calculates the probability of failure P that UE inserts E-UTRAN _Preamble, comprising:

3. according to claim 1 or claim 2 method is characterized in that:

4. method as claimed in claim 3 is characterized in that:

P _preamble＝∑N _{(numberOfPreambleSent-r9！＝1)}/∑N _total，

5. method as claimed in claim 3 is characterized in that:

At the probability of failure P that inserts E-UTRAN according to said UE _PreambleWhether the value of adjudicating the current leading initial target power of said PRACH is before the optimal power value, also comprises and calculates the current leading initial target power of said PRACH, specifically comprises:

6. method as claimed in claim 5 is characterized in that:

The said probability of failure P that inserts E-UTRAN according to said UE _PreambleWhether the value of adjudicating the current leading initial target power of said PRACH is the optimal power value, comprising:

7. the method for claim 1 is characterized in that:

The court verdict that said base station is returned according to said OMC is adjusted the leading initial target power of said PRACH adaptively, comprising:

8. method as claimed in claim 7 is characterized in that:

9. base station comprises:

10. base station as claimed in claim 9 is characterized in that:

Said PRACH access failure detection module is used to detect and add up the number of the user equipment (UE) that the land radio access web E-UTRAN that inserts evolution once failed, and calculates the probability of failure P that UE inserts E-UTRAN _Preamble, comprising:

Sense cycle timer, sense cycle and UE number statistical variable are set;

11., it is characterized in that like claim 9 or 10 described base stations:

Said PRACH access failure detection module is used to calculate the probability of failure P that UE inserts E-UTRAN _Preamble, comprising:

12. base station as claimed in claim 11 is characterized in that:

Said PRACH access failure detection module is used to detect and add up the number that inserts the UE that E-UTRAN once failed, and calculates the probability of failure P that UE inserts E-UTRAN _Preamble, comprising:

P _preamble＝∑N _{(numberOfPreambleSent-r9！＝l)}/∑N _total，

13. base station as claimed in claim 11 is characterized in that:

Said PRACH power optimized judging module also is used at the probability of failure P that inserts E-UTRAN according to said UE _PreambleWhether the value of adjudicating the current leading initial target power of said PRACH is before the optimal power value, calculates the current leading initial target power of said PRACH, specifically comprises:

14. base station as claimed in claim 13 is characterized in that:

15. base station as claimed in claim 9 is characterized in that:

Said PRACH self adaptation adjusting module, the court verdict that is used for returning according to said OMC are adjusted the leading initial target power of said PRACH adaptively, comprising:

16. base station as claimed in claim 15 is characterized in that:

Said PRACH self adaptation adjusting module also is used to write down the value that last PRACH power is adjusted the leading initial target power of the said PRACH in back;

17. the system that the PRACH power adaptive is optimized and revised comprises like described base station of claim 9～16 and the OMC of operation maintenance center.