CN101296470A - Wireless network overlapping road detecting software supporting TD-SCDMA - Google Patents

Abstract

The invention provides road test software supporting a TD-SCDMA wireless access network, which can meet the requirements of the planning and optimization of the TD-SCDMA network in combination with a receiver and a GPS. The invention provides a method for calculating the performance parameter of the TD-SCDMA network and can intuitively and correctly reflect the quality of the network. The invention also provides a structuring thought of the TD-SCDMA road test software which comprises: an interface layer, which communicates with the receiver and the GPS, sends a network parameter value measured on the spot and geographical position information to an analytics layer; the analytics layer corresponds the geographical position information to the network parameter value one by one and classifies and reorganizes the TD-SCDMA network parameter value according to the standard set by users, thereby being capable of analyzing and diagnosing the state of the network measured in an intelligent manner; a presentation layer visually presents the classified and reorganized network parameter value and the analytic and diagnostic results of users in many ways, such as map, report form, and diagnostic listing presenting and so on. The invention also provides key technologies of propagation model correction, network coverage and test, data analysis and diagnosis, etc.

Description

A kind of wireless network overlapping road detecting software of supporting TD-SCDMA

Technical field

The present invention relates to the architecture and the rudimentary algorithm of the wireless network overlapping road detecting software of a kind of TD-SCDMA of support, relate to the method and the key technology thereof of carrying out the network planning and optimization with drive test software.

Background technology

The TD-SCDMA technology standard is about to sizable application, to build a hundreds of thousands TD-SCDMA base station and cover indoor distributed system up to a million, how do these base stations and compartment system build up the back signal covering quality? whether capacity suitable? do actual conditions conform to design? how to the base station, antenna is adjusted, optimize network configuration? these all are the problems that must face.Present testing mobile phone, equipment such as sweep generator can test signal intensity, scanning continuous wave signal etc., but these instrument poor compatibility each other, function singleness will overcome the above problems comprehensively and has difficulties.At above problem, our the TD-SCDMA wireless network overlapping road detecting software of invention is to use testing mobile phone, instruments such as sweep generator obtain network testing data, analysis and diagnosis by the TD-SCDMA wireless network overlapping road detecting software, know that accurately the TD-SCDMA base station covers efficient, area interference, parameters such as signal quality, the concrete scheme of network planning and optimization is proposed, improve the network performance of TD-SCDMA, optimize station layout, reduce networking and construction cost, promote the technological progress of TD-SCDMA network planning and optimization.

Relative WCDMA of TD-SCDMA and CDMA2000 start late, still blank out almost aspect the exploitation of the public software platform of the network planning and the network optimization.If there are not the research and development of TD-SCDMA wireless network overlapping road detecting software, the network topology of TD-SCDMA, indoor covering, the installation of base station, debugging will lose strong tool, cause network coverage efficient low the most at last, poor performance might make network normally not move, therefore, the construction of TD-SCDMA network and operation maintenance be unable to do without the TD-SCDMA wireless network overlapping road detecting software.External producer Agilent, R﹠amp; S and An Lineng are provided for the tester of scientific research and development, also do not have engineering product, and the product that its scientific research is used can not satisfy the needs of engineering fully.Domestic Milky Way bright spot though units such as the many friends in Wuhan are being engaged in the research and development of instrument, mainly concentrates on the research and development aspect of terminal test equipment, and the wireless network overlapping road detecting software of base station side does not drop into a large amount of manpower and materials.

Summary of the invention

The present invention provides a public wireless network overlapping road detecting software for the network planning of TD-SCDMA and the network optimization.This wireless network overlapping road detecting software can run on PDA or the PC, and it supports frequency sweep configuration and Operation and Maintenance, supports the real time monitoring of wireless signal strength and quality, supports storage to select and the data readback function.Carry out the map sweep check at the different scenes in indoor and outdoor, support the reproduction of drive test data on map, form the geographical coverage diagram of a plurality of wireless parameters; Support MapInfo, electronic chart forms such as BMP; Test data statistical analysis and diagnostic function are provided, comprise the high interference analysis, pilot pollution, weak covering etc.; The customization and automatic systematic function of statistical analysis form are provided.Particular content is as follows:

One, the core algorithm of TD-SCDMA Drive Test Data Analysis and performance optimization

The core algorithm of TD-SCDMA drive test common platform comprises received signal intensity indication (RSSI) computational methods, code domain power (RSCP), sign indicating number territory interference power (ISCP), carrier/interface ratio (C/I).

Received signal intensity indication (RSSI):

In the standard of TD-SCDMA, RSSI is meant regularly the received power on the carrier bandwidths in crack.In the TD-SCDMA sweep generator, need carry out the measurement of the PCCPCH channel in TS0 time slot and DwPTS time slot, Midamble time slot, the TS0 time slot, thereby obtain the important parameter index of TD-SCDMA: the RSSI of descending synchronous signal channel RSSI, Mid sign indicating number, the RSSI of Primary Common Control Physical Channel.Because what ask is gross power, can be directly by asking mean-square value to obtain.If the received signal sequence is r (i), comprise noise and interference, then gross power is

$\mathrm{RSSI}=\frac{1}{N*256}\underset{i=0}{\overset{N*256-1}{\mathrm{\Σ}}}{\left|r\left(i\right)\right|}^2$

Code domain power (RSCP):

RSCP is defined as received signal code power, the signal power of measuring on designated code.In current frequency f _iEach receive in data block, calculate code domain power P (f with following formula _i):

$P\left(f_i\right)=\underset{k=1}{\overset{\mathrm{Bw}}{\mathrm{\Σ}}}{\mathrm{VI}}_k^2+V{Q}_k^2---\left(9\right)$

Wherein, Bw is the piece window VIk of 432 chips and the effective value of in-phase component and quadrature component that VQk is k chip, determines the power of the strongest data block in current searched frequency f

Sign indicating number territory interference power (ISCP):

Sign indicating number territory interference power be defined as after the received signal intensity on the designated code is removed signal power other power promptly: ISCP=RSSI-RSCP

Carrier/interface ratio (C/I):

C/I=RSCP/ISCP is defined as on some channels, the ratio of the signal power of reception and the interference power that can not eliminate.

Two, the architecture of wireless network overlapping road detecting software (comprising functional module, external interface)

The architecture of TD-SCDMA wireless network overlapping road detecting software is by interface layer, analysis layer, presentation layer and run on PDA and the function mould of the drive test software of PC is fast and the external interface composition.The functional module of software comprises analysis module, and signaling is separated clear module, data convergence module, diagnostic module, statistical module, engineering management module, GIS functional module, test data administration module, device management module and statistical diagnosis module.Interface can adaptive multiple tester, guarantees that wireless network overlapping road detecting software can insert testing mobile phone, sweep generator and GPS.As shown in Figure 1.

Three, the key technology of wireless network overlapping road detecting software

The propagation model revision technology: at the network planning initial stage, driver test system will be tested the communication environments of planning the zone, i.e. CW test.Can carry out the communication environments generaI investigation and be used for carrying out propagation model revision by this method.The CW frequency sweep mode is used to measure the continuous wave power of specifying in the descending 2010-2025 frequency range of TD-SCDMA on the frequency.Sweep generator is according to the frequency of setting, and resolution bandwidth, measuring period are measured and data report.TD-SCDMA indoor and outdoor propagation model revision, the network optimization, network coverage test can be provided, can produce histogram, GIS figure, pie chart and on-the-spot sub-district coverage test form.

Network coverage test and validation

Network coverage test mainly is at PCCPCH, and downlink pilot frequency channel carries out Measurement and analysis.Can finish network coverage analysis by means of above-mentioned measurement, switch band analysis, disturb location etc.Cover data can be finished data processing in the analysis software of backstage, carry out the screening of data and demonstration and matching with mobile phone and carry out the positioning problems analysis.The backstage analysis software possesses common frequency multi-cell and the multifrequency point function with little domain scanning.The figure middleware Technology of application of advanced in the wireless network overlapping road detecting software, the background process technology, link detects and recovery technology automatically.The standardized form of depositing of The data not only can utilize the analysis software of oneself to carry out network analysis, and intelligent diagnostic function also can allow the product of relevant other manufacturers discern simultaneously.

Data analysis and diagnosis

The drive test software utilization disturbs the technology of pruning to carry out data processing, and the co-frequency cell detectability has been brought up to 15dB from 8dB; Utilize frequency departure software compensation method, be implemented in frequency difference ± 7kHz scope, eliminate the power measurement error that frequency departure causes.Adopt GIS-Geographic Information System (GIS) technology, propagation model revision algorithm and friendly graphical display technics, high-speed data is handled, software is phase-locked and support the technology such as frequency sweep of vehicle-mounted translational speed.The analysis of test data and performance index has reflected the quality of optimizing.At present the backstage analysis software is supported multiple intelligent diagnostics function, can export the form of diagnostic result and diagnostic data is shown on the map automatically.The intelligent diagnostics function can very visual and accurate embodiment network coverage quality.The diagnosis that can support at present has the high interference analysis, weak covering analyzing, pilot pollution analysis.

Description of drawings

Fig. 1 is the structure chart of TD-SCDMA wireless network overlapping road detecting software;

Fig. 2 is the frame assumption diagram of TD-SCDMA drive test software;

Fig. 3 is the flow chart of TD-SCDMA drive test software Cell searching.

Embodiment

As shown in Figure 2: a TD-SCDMA subframe comprises seven time slots, and wherein the TS0 time slot defaults to descending time slot, and TS1 defaults to up, and other time slot can be set to up or descending by DCA (dynamic channel allocation) technology.Between TS0 and TS1, there is one section time slot to comprise DwPTS (descending pilot frequency time slot) and UpPTS (uplink pilot time slot) and GP (protection is at interval), first transfer point of up-downgoing is positioned at GP.And Midamble (training sequence) yard two segment length that are positioned at TS0 are in the middle of the data of 352 chips.The position of second transfer point of up-downgoing is according to the information acquisition of first transfer point, and second position of conversion point shown in Fig. 2 is a TS1 time slot end point.

Be used to carry out the pilot tone covering analyzing, location etc. is assisted in the soft handover area analysis.The pilot tone cover data can be finished data processing in drive test software, carry out the screening and the demonstration of data, and matching with mobile phone carries out the positioning problems analysis.The sweep generator of superior performance can search the cell information of different frequent points usually fast, and to multifrequency point, the common frequency multi-cell network test is very useful.Drive test software possesses the function of common frequency multi-cell and multifrequency point scanning.The analysis final decision of test data and performance index the quality of optimizing.Support multiple intelligent diagnostics function, can export the form of diagnostic result and diagnostic data is shown on the map automatically.The intelligent diagnostics function can very visual and accurate embodiment test case and network condition.The diagnosis that can support at present has the high interference analysis, weak covering analyzing, pilot pollution analysis.

The flow process of TD-SCDMA Cell searching, as shown in Figure 3: at first carry out the search and the down-going synchronous code searching of descending pilot frequency time slot, determine their position.Clearly lead after the position of time slot and descending synchronous code down, just can determine the position of training sequence according to the structure of the basic frame of TD-SCDMA, enter control multi-frame synchronous phase then, in this stage, the user must at first search the MIB (Master Indication Block) of BCH interlacing frames in PCCPCH, MIB is indicated with respect to the phase place of the training sequence code among the PCCPCH by DwPTS.After finding the MIB position, through repeated detection, determine errorlessly, just can from one or several BCH of a sub-district, read broadcast message, finish Cell searching.Sweep generator is finished cell search process by above-mentioned steps.Middle some step failures just can enter next subprocess after having only previous subprocess to finish, if must be returned first step and restart.

The TD-SCDMA network optimization comprises many aspects, need the optimization and the drive test of network wireless performance parameter be carried out simultaneously.Drive test data has the intensity and the quality of district pilots, and the size of sub-district signal interference ratio comprises that also the covering between a plurality of sub-districts relatively waits.Go out the problem of related network by analyzing and diagnosing, produce the Final Report that embodies network performance.The drive test parameter generally comprises the pilot tone coverage test, switches index, data service performance test, business function test or the like.In general, drive test need be collected data by means of the drive test instrument, needs sweep generator usually, GPS module, signal source, the supporting notebook computer that drive test software is housed of while etc.The radiofrequency signal that signal source or base station produce enters the interface layer of wireless network overlapping road detecting software after sweep generator receives.The data that test terminal and GPS tester detect also can enter wireless network overlapping road detecting software by interface layer.The data of handling through interface layer enter the analysis layer of wireless network overlapping road detecting software, module by analysis, and signaling is separated clear module, the data convergence module, diagnostic module and statistical module enter presentation layer after handling.In the engineering management module of presentation layer, GIS functional module, test data administration module, the data and the chart that present test after device management module and the statistical diagnosis resume module and analyze.

Claims (9)

1. wireless network overlapping road detecting software of supporting TD-SCDMA is characterized in that comprising:

Constitute whole software by interface layer, analysis layer and presentation layer.Wherein interface layer is connected with sweep generator, testing mobile phone, GPS, interface layer provides network parameter and geography information parameter for software systems, analysis layer is with the arrangement of network parameter index category and the diagnostic process of gathering, presentation layer then provides the ways of presentation of multiple analysis result and diagnostic result, satisfies simultaneously network is monitored in real time.

2. drive test software according to claim 1 is characterized in that:

One cover TD-SCDMA real network performance index RSSI, RSCP, C the computational methods of I, for further performance evaluation and problem diagnosis provide foundation.

3. system according to claim 1 is characterized in that:

Has the link auto restore facility.After drive test software and test receiver communication link disconnected, software systems issued handshake packet automatically and connect once more up to link.

4. according to claim 1 and 2 described drive test softwares, it is characterized in that:

One cover network parameter index diagnostic method.The user only need set diagnostic criteria, and software systems generate diagnostic result automatically, represents in the tabulation mode, and can be output as the Excel document; Can on map, directly check the position of problem sampled point for the data that GIS information is arranged.

5. according to claim 1 and 2 described drive test softwares, it is characterized in that:

A kind of form of TD-SCDMA analytic statistics is exported automatically, the user need select one or more file of being tested, set the parameter of output, software systems can be exported statistics with form and graph mode automatically in Word document, and to the exportable test sample locus of points of indoor test data sheet figure.

6. according to claim 1 and 2 described drive test softwares, it is characterized in that:

A kind of method of recording playback TD-SCDMA measuring process can be used as test data backup and test data playback.

7. according to claim 1 and 2 described drive test softwares, it is characterized in that:

A kind of TD-SCDMA method for real-time monitoring.According to the mode of cell list or rule tabulation frequently, by user's designated cell frequency, scrambler with report the time interval.Support common frequency multi-cell or the many sub-districts of alien frequencies to monitor in real time, maximum monitored cells number is 16.

8. according to claim 1 and 2 described systems, it is characterized in that:

The direction coordinate and the latitude and longitude information that show current drive test in real time.

9. according to claim 1 and 2 described systems, it is characterized in that:

When outdoor drive test, have automatic measurement track systematic function, need not the manual confirmation sampling point position.

Images