Analysis of 3G wireless network programming optimization software Technology

A comprehensive network planning and optimization software, which has many kinds of technology and user-friendly interface, plays an important role in the wireless network planning and design process of mobile operators. The software not only has a strong engineering capacity, but should be an open, scalable and flexible technology information system that can be easily integrated with other IT systems to increase productivity and shorten delivery latency. This paper mainly analyses the technical requirements of 3G wireless network for planning and optimizing software, and aims to emphasize the complexity of 3G wireless network planning and optimization, so as to give attention to the following points when using software to plan and optimize wireless network.

3G Wireless network's technical requirements for planning software

3G network planning is very heavy work, so it is necessary to require software to use distributed structure and parallel algorithm, allowing distributed computing on multiple workstations and supporting parallel algorithms on multiprocessor servers in order to greatly reduce the number of predictions and improve the utilization of hardware systems; In addition, The software should support network configuration from a stand-alone configuration to an enterprise based server, supporting full project execution. (Computer science)

3G Wireless network planning software should have at least the following technical elements:

1. Digital Map

Map data is an important factor influencing the accuracy of planning results, planning software should have the interface with digital map data, and should provide the interface format so that planners can easily use map data of map production units. In addition, in the graphics processing function, the map editor should be provided to facilitate the editing of ground types, heights and vectors.

2. Propagation model

The propagation model is used to simulate the attenuation of electrical signals in wireless environments, estimating the value of signal field strength as close to the actual receiving point as possible, using the propagation model to make rational plot planning, not only satisfies the user's demand but also saves the investment, the degree of network planning is inseparable with the accuracy degree of the propagation model.

In the second generation of digital cellular mobile technology GSM, several common propagation models recommended in GSM code are the empirical formulas that we have already known and widely used in engineering practice. It includes the Okumura-hata, Cost231-hata and the Walfish-ikegami formula suitable for the honeycomb structure, which is suitable for the outdoor-type large-area cellular structure.

At present, there are many kinds of planning software, each programming software has different propagation model algorithm, some of these algorithms are modified to make it more suitable for engineering use or more suitable for certain terrain propagation characteristics. As a result, it can be used as engineering, and it is not rigidly adhere to several model types recommended by the specification. Or, it is possible to import other software's propagation model algorithm into the software, which is also a way to use.

At the same time, the function module of the planning software which is related to the propagation model is the model revision function. The propagation models in general programming software provide the default model correction coefficients as the final formula for calculating path losses. However, because these correction coefficients have not been corrected by Field CW test, these results are less reliable. In the engineering, especially in the initial stage of our network, we often need model modification to get the model correction factor which can accurately meet the loss of local wireless link, therefore, in the planning software, the model correction function is required.

The planning software with the above algorithm and function can provide the most convenience for the user to generate the best propagation model adapted to the local geographical environment.

3. Base station coverage Forecast management

Planning software to provide a first-class base station coverage prediction generation and management functions, can generate base station coverage array, but also reflects the base station parameters change in the base station prediction effect.

At the same time, the prediction of software generation has the following requirements:

(1) It is reasonable to calculate the effective height of the base station antenna, instead of simply referencing the input base station antenna height data at every point in the prediction range;

(2) Each point in the coverage area has corresponding forecast value;

(3) Provide advanced data structure, the modification of Base station parameters, such as ERP, azimuth angle and antenna pitching angle, will not change the link loss value of each specific route, but will affect the parameters of the coverage radius of the cell, by the advanced data structure of the software, without the need to regenerate the forecast, so as to avoid the tedious prediction. The community planners can save a lot of time by working in a large area.

4. Coverage Analysis

Coverage analysis should support a variety of coverage calculation and coverage display methods to meet the needs of users, can be each point of the signal coverage and service community analysis.

Users can choose their own coverage of the display method, display the best coverage signal, the various conditions of the coverage threshold can be defined by the user, can be displayed in a variety of ways, can be displayed at equal intervals or in accordance with user-defined various coverage thresholds, such as street cover, indoor coverage, car coverage.

Three, 3G wireless network to optimize the software technical requirements

1. Wireless network test Platform

It provides the reliable information for the network maintenance and optimization and the opening of the system equipment through the comprehensive measurement of WCDMA network air interface and the combination of geographic information. For the Wireless interface parameter verification, analysis and optimization, fault detection and so on. By accessing the wireless network, using the mobile network services such as voice, data or Internet, real-time observation of network wireless parameters, business quality, and save the entire test process, recorded information can be exported to the map or post processing software for analysis.

(1) The main parameters of the measurement

A. Key RF Parameters

B. Open-loop power control parameters

C. Closed-loop power control parameters

D. Soft switching and softer switching parameters

E. Quality parameters

F. Signalling measurement

G.RRC status information

H. Switching between systems (WCDMA and GSM)

(2) Main function

Complete collection of wireless data and signaling data for the UU mouth: Rx,tx,cpichec/io, Bler, TA, power, data throughput, layer 1, Layer 2, and Layer 3 information and debug information.

Fully parse layer one, layer two and layer three information, while displaying NAS information and data measurement information. Layer One information includes: Search window, search list, TA, power, RACH/PRACH,DRX mode, transmission channel, physical channel, Rmul, activation set and neighboring set. Layer Two messages include: Ul/dlmac logical channel parameters, RLC ul/dl State, RLC am PDU and RLC am NAK PDU.

Provide real-time test trajectory display: rx,tx,tx-adj,sir,rscp,iscp,ec/io,bler,ppp,ftp and so on.

Flexible test scenario configuration.

Provides hardware port automatic detection function.

Provide base station information import function and test data export function.

Provides freeze screen functionality and inserts memo functionality in the test.

Supports Ppp,ftp,http data testing.

Verify and optimize the handoff between WCDMA and GSM systems, prove the compression mode, compare the performance and coverage of WCDMA and GSM, and verify the access of WCDMA and GSM.

WCDMA and GSM testing.

Real-time geographic information for NodeB.

Soft switching analysis.

Power control verification.

User-Configurable log file output.

User-configurable event, display, and threshold values.

Call statistics.

Data recording and playback, including voice and data business processes.

Data output (including voice and data business processes).

Parameter link.

Alarms and alarms.

Schedule.

Report output.

Road map.

(3) Data output format

. csv: comma-delimited data format, ASCII text file.

. MIF: This mapinfo format can be used for MapInfo analysis software.

GLE: Data collected by multiple Qualcomm CDMA handsets can be exported in high throughput data format.

. fta:idenfta format.

. txt: tab-delimited format, text file.

2. Wireless network test post-processing software

The main functions include the following aspects.

(1) Provides a flexible Report wizard, which is independent of background data analysis and can be executed separately; Users can customize the report template.

(2) provide a variety of imagery forms: maps, time domain, tables, statistics, signaling information. It can support vector map, raster map, support base station data import, form Base station layer on map, support signaling filtering function.

(3) Provide statistical analysis function. Parameters include:

–rssi,tx,tx Adjust, Bler, Cpich ec/io, etc.;

– the correlation between parameters;

–pdf and CDF.

(4) The trajectory information display can be displayed according to multiple parameters.

(5) Provide data playback function.

(6) automatic generation of system quality reports.

(7) Detect and track each call.

(8) Analysis of GPRS data.

(9) Conducting c/i,c/a and SQI analysis;

(10) Coverage analysis, including nodeb coverage area estimation;

(11) Interference analysis;

(12) switching analysis;

(13) A list of adjacent areas;

(14) Pilot-frequency pollution analysis;

(15) Display site, equipment and log data;

(16) Analysis includes the drop/block, call duration and log files, test cell phone information;

(17) Exception handling;

(18) Using accurate geographic information to solve problems;

(19) Automatically generate the above analysis and test results required by the report.