CN1257622C - Method for detecting receive link of CDMA base station - Google Patents

Abstract

The present invention provides a method for detecting CDMA base station receive chain performance, which comprises: setting 2*k locked counters for a multi-diameter signal handler n of a baseband signal processing unit m for representing the number of locked times of the main diversity reception link of k sectors of the base station by the multi-diameter signal handler n of the baseband signal processing unit m; respectively accumulating the locked counter of the multi-diameter signal handler of all the baseband signal processing units at certain intervals, and obtaining the locked statistic of each receiving link; respectively counting the balance degree of the main diversity reception link according to a formula, and judging faults of the base station receiving link. The present invention adopts the ratio of the number of locked times of the main diversity reception link by the multi-diameter signal handler as the evaluation index of the balanced performance of the main diversity reception link to be used for evaluating the receptivity of the receiving link; by the detection of the balanced performance of the receiving link, the performance evaluation of the base station receiving link can be given so as to achieve the goal of the actual monitoring of the base station receiving link.

Description

Cdma base station receives link detection method

Technical field

The present invention relates to the CDMA field of mobile communication, what relate in particular to the CDMA field of mobile communication receives the method that link performance detects to base station radio-frequency.

Background technology

The CDMA mobile communcations system is made of travelling carriage and mobile radio communication, and reception and the sending function to radio frequency signal realized in the base station in mobile radio communication.

Major function two aspects of cdma base station: (1) converts radiofrequency signal to baseband signal, extracts the Frame that mobile phone sent again from baseband signal; (2) Frame that communication network is sent converts baseband signal to, converts baseband signal to radiofrequency signal again, by sending mobile phone in the air to.The base station mainly is made up of radiofrequency signal processing subsystem and base band signal process subsystem, and the performance of base station is mainly determined by the performance of radiofrequency signal processing subsystem and base band signal process subsystem.

Comprised the composition of a lot of analog circuits in the radiofrequency signal processing subsystem, antenna, antenna feeder also belong to the part of radiofrequency signal processing subsystem.The ageing failure of analog circuit analogue device, antenna, antenna feeder is because the fault that certain reason causes, can cause the decline of the ability of radiofrequency signal that the base station sends or received RF signal, normally a kind of progressive mode of this performance decrease, promptly often be not easy to find by a spot of call testing, more because the complexity of wireless environment, even occur unusual in the calling procedure, also can't simply problem be attributed to certain factor, but this radiofrequency signal processing subsystem performance decrease may bring but speech quality to descend, the serious consequence that the system wireless capacity descends.

Though by playing the certain guarantee effect to radio frequency signal processing subsystem performance stable to making regular check on of antenna for base station, antenna feeder, radio-frequency devices, shortcoming also is tangible; At first, the appearance of fault normally at random, make regular check on this powerless, secondly, the base station often is dispersed in each corner of service area, does not check targetedly that to human and material resources all be great waste, at last, if there is not effective detection means, even site inspection can't guarantee that also antenna for base station, antenna feeder, radio-frequency devices keep good performance state.

In the past, base station system is received link performance does not have a kind of reasonable, easy, effective appraisal procedure, and the operation conditions that the base station receives link can not get effective monitoring, and the attendant can't accurately grasp network operation situation.The anomalous effects conversation appears in case receive link, when the attendant arranges barrier at the scene often owing to there is not effective on-the-spot real-time performance evaluation measures yet, and the state that troubleshooting effort is in get half the result with twice the effort.

If can fast assess detection to the performance of antenna for base station, antenna feeder, radio-frequency devices exactly rapidly in operation maintaining background, be very helpful for the efficient that improves the base station system maintenance work, also be necessary.

Summary of the invention

The technical problem to be solved in the present invention is in order to realize a kind of method that effectively cdma base station reception link performance is detected, to save the base station system maintenance cost to reach, maintaining easily the purpose of personnel's work.

What the present invention proposed receives the method that link performance detects to cdma base station, comprises the steps:

For the multipath signal processor n of baseband signal processing unit m is provided with 2*k lock count device, be used to represent the main diversity reception link of a base station k sector by the number of times of the multipath signal processor n of baseband signal processing unit m locking;

Lock count device every one sufficiently long period with the multipath signal processor of all baseband signal processing units of base station adds up respectively, obtains respectively to receive the line lockout statistical value;

Calculate main diversity reception link balance degree respectively according to formula:

Based on effective main diversity reception link balance degree, carry out the deterministic process that following base station receives link failure:

If the main diversity reception link balance degree that any two sectors are arranged in the sector of base station is all greater than 10, then the diversity antenna of two sectors connects instead;

If the main diversity reception link balance degree that any sector is arranged in the sector of base station is all greater than 10 and less than 100, then the main diversity antenna directivity of this sector is inconsistent;

If the main diversity reception link balance degree that any sector is arranged in the sector of base station is all greater than 100, then the radio-frequency devices of this sector has fault;

The aforesaid method that cdma base station reception link performance is detected, if the base station lacks certain sector, then the main diversity reception link balance degree of respective sectors is invalid; If the confidence level of main diversity reception link balance degree is less than 1, then corresponding main diversity reception link balance degree is invalid.

The aforesaid method that cdma base station reception link performance is detected, the described one sufficiently long period can be 20-30 minute.

It is the index of main diversity reception link balance assessment by likening to of number of times of multipath signal processor locking that the present invention adopts main diversity reception link, is used to assess the receptivity that receives link, and following benefit is arranged:

(1) reasonable

Receive of the processing of the signal of link reception by the multipath signal processor, extract effective energy information, a plurality of multipath signal processor energy informations are used for the Frame that synthetic mobile phone sends, reception link received signal just is to provide effective energy information for the multipath signal processor to the contribution of base station receiving function, this contribution can embody by the number of times that is locked by the multipath signal processor, therefore adopt the reception link to be locked the number of times conduct to receiving the foundation that link performance is assessed by the multipath signal processor, it is a kind of very directly mode, just because of this substantivity, guaranteed the accuracy of evaluation result.

(2) easy

In the base band signal process subsystem of cdma base station system, the multipath signal processor is that a kind of necessary function realizes to the processing of multipath signal, as long as there is the user to be in talking state, the reception link of corresponding base station sector just must be by certain multipath signal processor locking, therefore, do not needed to increase especially equipment to receiving link by the statistics of multipath signal processor locking number of times, do not need special test process yet, as long as increasing the reception link in the software of base band signal process subsystem is realized by the algorithm of multipath signal processor locking number of times statistics, when the user is in talking state, can finish receiving link by the statistical work of multipath signal processor locking number of times.In addition, do not needed complicated calculating by the analysis of the statistics of multipath signal processor locking number of times,, often just can make judgement accurately the order of severity of fault and the root of fault by simple reasoning to receiving link.

(3) low cost

Owing to do not needed to increase especially equipment by the statistics of multipath signal processor locking number of times to receiving link, do not needed complicated calculating to receiving link by the analysis of the statistics of multipath signal processor locking number of times, therefore in the realization of function, do not need to increase what cost basically.

Do not needed special test activity to receiving link by the collection of the statistics of multipath signal processor locking number of times, as long as there is user's normal talking just can access statistics, therefore, the attendant can obtain the information that the base station receives link performance in real time quickly by operation maintaining background, and this is very effective for the maintenance cost that reduces base station system.

(4) effective

By providing the assessment that the base station receives link performance, reach the purpose that base station reception link performance is monitored to the detection that receives link balance.

Description of drawings

Fig. 1 is the schematic diagram of cdma base station system (BTS) in mobile communication system;

Fig. 2 is the structural representation of cdma base station system (BTS);

Fig. 3 receives the schematic diagram of link for cdma base station;

Fig. 4 is for receiving line lockout number of times statistical method flow chart;

Fig. 5 is that sector master's diversity reception link balance degree generates method flow diagram.

Embodiment

The position of cdma base station system (BTS) in CDMA mobile communication system as shown in Figure 1, base station system (BTS) (is made of base station controller BSC, mobile switch MSC, public exchange transmission network PSTN from network side.) receiving data frames, earlier Frame is changed baseband signal, convert radiofrequency signal again to, be transferred to antenna by antenna feeder and send to mobile phone wirelessly, simultaneously, antenna for base station receives the radio frequency signal that mobile phone sends, be transferred to the base station by antenna feeder, the base station converts radiofrequency signal to baseband signal, and extracts the Frame that mobile phone sends from baseband signal, then Frame is sent to network side.For improving the performance that the base station receives wireless signal, two reception antennas have been installed in the base station, and to reach the purpose of space diversity, relevant base station has two cover radio frequencies to receive link.

The functional structure of cdma base station system (BTS) is led the collection antenna and is born the transmitting-receiving task simultaneously as shown in Figure 2, and diversity antenna is then only born the reception task, and from the receiving function of being realized, main diversity reception link is the same basically.After the radiofrequency signal that the reception link receives converts baseband signal to, be transferred to the baseband signal processing unit in the base band signal process subsystem, baseband signal processing unit is handled the baseband signal that each self-corresponding mobile phone sends over respectively, generates Frame and sends to network side.For the Frame that network side sends over, baseband signal processing unit converts Frame to baseband signal, is transferred to the transmitting chain of radiofrequency signal processing subsystem, converts radiofrequency signal to, is transferred to antenna by antenna feeder, from sending to mobile phone in the air.

The functional structure of cdma base station reception link as shown in Figure 3, the baseband signal of main diversity reception link all is transmitted to baseband signal processing unit, baseband signal processing unit is searched for effective multipath from baseband signal, effectively multipath is respectively by several multipath signal processor processing, the multipath signal processor therefrom extracts the energy information of multipath, these energy informations are sent to and are used to generate Frame in the multipath energy synthesizer, and the Frame of generation is sent to network side.The multipath signal of multipath signal processor processing may receive link by main collection and send, also might send by the diversity reception link, the foundation that the multipath signal processor is selected multipath signal is the size of multipath signal energy, the foundation of multipath signal processor decision multipath signal going or staying also is the size of multipath signal energy, if the multipath signal energy is enough big, the multipath signal processor can be in the lock state, and can obtain effective energy information from multipath signal; If the multipath signal energy diminishes even disappears, the multipath signal processor can't continue to keep lock-out state, correspondingly also can't from multipath signal, obtain effective energy information, after this situation continues the regular hour, the multipath signal processor will be reselected multipath signal, new multipath signal may come from either party of main diversity reception link, and the foundation of choice is the intensity of multipath signal energy.

The index of main diversity reception link balance assessment is exactly by the ratio of multipath signal processor locking number of times statistics.When baseband signal processing unit is allocated for the reverse signal of certain mobile phone of demodulation, whether the some multipath signal processors in the baseband signal processing unit will be selected multipath signal according to the intensity of multipath signal energy, and be in the lock state according to the intensity decision of multipath signal energy.Software in the base band signal process subsystem can regularly be inquired about the lock-out state of multipath signal processor, and handled multipath signal comes from that reception link, statistics by certain hour, can obtain the statistics that main diversity reception link is locked by the multipath signal processor, because it is the same receiving the relation of all multipath signal processors in link and the baseband signal processing unit, therefore all multipath signal processors are can add up respectively as receiving the statistical value that link is locked by the multipath signal processor to the locking statistical value of main diversity reception link, further, receiving link also is the same with the relation that all receive the baseband signal processing unit of its baseband signal, therefore all receive all multipath signal processors in the baseband signal processing unit of its baseband signal to receiving the locking statistical value of link, also are can add up respectively as receiving the statistical value that link is locked by the multipath signal processor.The aforementioned purpose that adds up is to make the statistical value can be than being easier to reach a higher value, because the statistics amount is limited, and the influence that causes accidentalia to produce is unnecessarily amplified to prevent, thereby improves the confidence level of statistics.

The statistical value that main diversity reception link is locked by the multipath signal processor promptly can be used for calculating main diversity reception link balance degree, and computing formula is as follows:

Main diversity reception link balance degree is big more, and then main diversity reception link balance is poor more, and it is serious more to receive the link abnormal problem, occurs unusual link usually and be few that of locking number of times, and another link unusual possibility occurs and also exists certainly.Because the effect of main diversity antenna space diversity, main diversity reception link locking number of times at short notice can be not just the same, and therefore, the locking number of times that is used for the calculated equilibrium degree (refers to big value wherein, because little value may be very little even be 0.) absolute value is big more, the confidence level of the degree of balance is just high more.In addition, if main diversity reception link all occurs unusually, may main diversity reception line lockout number of times all be 0 then, this moment, fault was very serious, because respective sectors can't be used for conversation at all.

Setting base station ALPHA, BETA, GAMMA sector master's diversity reception link balance degree are respectively ALPHARecBalance, BETARecBalance, GAMMARecBalance, main diversity reception link balance degree confidence level is respectively ALPHARecBalanceCre, BETAReceriverBalanceCre, GAMMAReceriverBalanceCre, and following computing formula is then arranged:

$\mathrm{ALPHARecBalance}=\frac{\max \{\mathrm{CFALPHA}0,\mathrm{CFALPHA}1\}}{\min \{\mathrm{CFALPHA}0,\mathrm{CFALPHA}1\}}$

$\mathrm{ALPHARecBalanceCre}=\frac{\max \{\mathrm{CFALPHA}0,\mathrm{CFALPHA}1\}}{\mathrm{STATISTICBASE}}$

$\mathrm{BETARecBalance}=\frac{\max \{\mathrm{CFBETA}0,\mathrm{CFBETA}1\}}{\min \{\mathrm{CFBETA}0,\mathrm{CFBETA}1\}}$

$\mathrm{BETARecBalanceCre}=\frac{\max \{\mathrm{CFBETA}0,\mathrm{CFBETA}1\}}{\mathrm{STATISTICBASE}}$

$\mathrm{GAMMARecBalance}=\frac{\max \{\mathrm{CFGAMMA}0,\mathrm{CFGAMMA}1\}}{\min \{\mathrm{CFGAMMA}0,\mathrm{CFGAMMA}1\}}$

$\mathrm{GAMMARecBalanceCre}=\frac{\max \{\mathrm{CFGAMMA}0,\mathrm{CFGAMMA}1\}}{\mathrm{STATISTICBASE}}$

Wherein STATISTICBASE is statistics radix, value 10000.

Based on top described principle, the statistics flow process of multipath signal processor locking reception link as shown in Figure 4.With 3 sector base stations is example, for the multipath signal processor is provided with 6 lock count device CFALPHA0n, CFALPHA1n, CFBETA0n, CFBETA1n, CFGAMMA0n, CFGAMMA1n, be used to the number of times of representing reception link ALPHA0, ALPHA1, BETA0, BETA1, GAMMA0, GAMMA1 to be locked by the multipath signal processor.

Each multipath signal processor is provided with a 10ms timer, behind this timer expiry, to judge whether the multipath signal processor is in the lock state, if be in unlock state, then restart 10ms regularly, otherwise, read the reception link information of multipath signal processor locking multipath signal, determine 6 certain counters that receives in the link counter to add up 1 according to this information, judge that then counter data reports timer whether overtime, overtime if timer does not have, then restart 10ms regularly, otherwise 6 statisticss that receive in the link counter are reported respective handling software, will restart 10ms after the counter O reset regularly.

Sector master's diversity reception link balance degree generating algorithm flow process judges at first whether the base station exists this sector as shown in Figure 5, if this sector does not exist, does not also just exist anything to receive the link balance degree; If this sector exists, then collect the statistics of all multipath signal processors of this base station to this sector master's diversity reception link, generate this sector master's diversity reception link balance degree based on these statisticss then, and main diversity reception link balance degree confidence level, if main diversity reception link balance degree confidence level is greater than 1, then main diversity reception link balance degree is effective, this parameter will report operation maintaining background, be used to carry out to receiving the detection of link, otherwise it is invalid that main diversity reception link balance degree will be judged to, can not be as the foundation to the reception link detecting.

The base station operation maintenance centre can reach different purposes to receiving the different disposal measure of absolute number of times of line lockout and main diversity reception link balance degree.

(1) performance monitoring

The base station operation maintenance centre regularly preserves the reception line lockout number of times and the main diversity reception link balance degrees of data that collect, and certain alarm threshold value is set, and can reach the long term monitoring to the base station system receptivity easily.

(2) detect in real time

Detect in real time and have very important significance for the row's barrier work after breaking down, when the attendant corrects the fault of antenna, antenna feeder or radio-frequency devices, usually need carry out at the scene, base station, the scene often lacks effective checking measure, receive line lockout number of times and main diversity reception link balance degrees of data by background maintenance personnel Real Time Observation this moment, can make assessment to row's barrier effect rapidly, thus the timely row of adjustment barrier strategy.

(3) fault judgement

By analysis to reception line lockout number of times and main diversity reception link balance degrees of data history and real time data, time, the rule of development that can be out of order and produce, be aided with the analysis of line lockout number of times and main diversity reception link balance degree intensity of variation again, can realize preliminary judgement failure cause.

During base station master's diversity reception link balance variation, can conclude that main collection receives link or diversity reception link receptivity has occurred unusually, also may be that main diversity reception link has all occurred unusually, and, can further analyze causing receiving the unusual reason of link according to the degree of main diversity reception link balance variation:

● antenna, antenna feeder, radio-frequency devices fault

If the main diversity reception link balance degree that any sector is arranged in the base station section is all greater than 100, then the radio-frequency devices of this sector has fault.

Antenna, antenna feeder structure is fairly simple, and the probability that damages is not too big usually, if antenna, antenna feeder are impaired, the number of times that corresponding reception link is locked by the multipath signal processor can be on the low side.

When radio-frequency devices breaks down; corresponding reception link can be leveled off to 0 usually by the number of times that the multipath signal processor locks; sometimes there is the situation of loose contact in radio-frequency devices; the number of times that corresponding reception link is locked by the multipath signal processor can level off to 0 and normal value between vibrate, cycle of oscillation is generally long.

● the directivity of antenna installation is inconsistent;

If the main diversity reception link balance degree that any sector is arranged in the base station section is all greater than 10 and less than 100, then the main diversity antenna directivity of this sector is inconsistent.

The antenna installation directivity is serious when inconsistent, main diversity reception link balance can occur unusually, but link generally can not appear receiving by multipath signal processor locking number of times be 0 situation, the reception link of common main diversity antenna correspondence all can have a certain amount of locking number of times, and the blocked number of times of main collection antenna corresponding reception link can be more more.

● the antenna feeder wrong

If the main diversity reception link balance degree that any two sectors are arranged in the base station section is all greater than 10, then the diversity antenna of two sectors connects instead.

The situation that the antenna feeder wrong in the process of engineering construction, occurs through regular meeting; main collection antenna wrong can be easy to judge by the situation of mobile phone received signal; but the diversity antenna wrong is not to have found so easily just; and observe main diversity reception link balance this moment; the situation that can occur main diversity reception link balance variation usually; for the base station that two above sectors are arranged; if exist plural sector to have the situation of main diversity reception link balance variation simultaneously, it is very big that then the diversity antenna feeder connects anti-possibility.

● interference in band or out of band.

Sometimes interference source has stronger directivity, and this also can make the appearance of reception link balance unusual, but will confirm that this problem also needs the detection means in conjunction with other, for example: spectrum analyzer.In addition, the interference source that directivity is not strong may not can cause the unusual of balance.

● the repeater

When main diversity reception link balance is analyzed, should consider also whether the base station has installed optical fiber repeater.The sector that has added optical fiber repeater, main diversity reception link balance also can occur unusually.Because the repeater only is connected with the transmitting-receiving port of main collection link, can make an uproar the end that main collection receives link and raise in the repeater, cause the diversity reception link to play a role, and the locking number of times of diversity reception this moment link will occur on the low side largely.

In addition, the attendant is when safeguarding the fault base station, for example: change radio-frequency devices, or get rid of antenna feeder fault etc., by being monitored in real time by multipath signal processor locking number of times statistics, can obtain the accurate foundation whether fault is got rid of rapidly to receiving link.

Claims (3)

1, cdma base station is received the method that link performance detects, it is characterized in that: comprise the steps:

For the multipath signal processor n of baseband signal processing unit m is provided with 2*k lock count device, be used to represent the main diversity reception link of a base station k sector by the number of times of the multipath signal processor n of baseband signal processing unit m locking;

Lock count device every one sufficiently long period with the multipath signal processor of all baseband signal processing units of base station adds up respectively, obtains respectively to receive the line lockout statistical value; The described sufficiently long time is satisfied the locking statistical number greater than statistics radix 10000;

Calculate main diversity reception link balance degree respectively according to formula:

Based on effective main diversity reception link balance degree, carry out the deterministic process that following base station receives link failure:

If the main diversity reception link balance degree that any two sectors are arranged in the sector of base station is all greater than 10, then the diversity antenna of two sectors connects instead;

If the main diversity reception link balance degree that any sector is arranged in the sector of base station is all greater than 10 and less than 100, then the main diversity antenna directivity of this sector is inconsistent;

If the main diversity reception link balance degree that any sector is arranged in the sector of base station is all greater than 100, then the radio-frequency devices of this sector has fault.

2, the method that cdma base station reception link performance is detected as claimed in claim 1, it is characterized in that: if the base station lacks certain sector, then the main diversity reception link balance degree of respective sectors is invalid; If the confidence level of main diversity reception link balance degree is less than 1, then corresponding main diversity reception link balance degree is invalid.

3, the method that cdma base station reception link performance is detected as claimed in claim 1, it is characterized in that: the described one sufficiently long period can be 20-30 minute.

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