NGN network test analysis
Abstract: This article introduces the current NGN network operators, and make a brief introduction to NGN network test methods and NGN test instruments of ZhongchuzuMepers. Keywords: NGN, PESQ, normative consistency test, business QoS test, NGN network statistical analysis 1, preface Next Generation Network (NGN) is a comprehensive open network architecture that includes voice, data, and multimedia, etc.; Exchange to the next generation network (NGN) provides real-time requirements, the service call control and connection control functions are the core of the next generation of network calls and controls. Some operators in China have begun to test or use softswitch networking solutions in 2000. The broadband data and applications currently based on soft exchange technology are basically mature, not only replacing the existing narrow-handed telephone exchange network, but also in business It is also more rich and complete. In terms of development trends, the networking of softswitch has become an inevitable choice of operators, and new technologies will inevitably bring some new problems, summarize as follows: - How to analyze network business status - how to understand the device Whether it is in line with the network specification - how to analyze the interconnection of the network - Does the business turnover meet the development requirements - Does the business QoS meet the requirements - how to quickly conduct network fault judgment - whether the network plan is in line with the business development situation does not solve the above Question, operators cannot understand their business operations in detail, will inevitably affect business development; unable to understand the QOS situation of the business, unable to come up with the convincing QoS report, will inevitably lead to a large number of customers, it is not compliant The standardized equipment will lead to the smooth opening of the business. Operation costs have increased significantly; do not understand whether business opening capacity meets development requirements, will lead to waste of resources, can not adapt to rapidly changed market demand; if the business failure cannot quickly judge, will cause networks Large-scale faults, affects the image of operators in the user's mind, leading to the decline in market competitiveness; can not conduct objective network business planning, will lead to unreasonable network resource structure. In short, do not solve these problems, NGN network operators cannot face increasingly fierce market competitions, they cannot adapt to changing market demand, and even eliminated in cruel competition. 2, NGN network test analysis For NGN network testing, it can basically be divided into two categories: NGN network service test, NGN network device test. For NGN network business testing, it can be divided into three test units: NGN network business statistics analysis, NGN network business planning test, NGN network service QoS test; for NGN network device testing, it can be divided into two test units: NGN network equipment specification consistency test, NGN network device performance test. The test method of each test unit is analyzed in detail below. 2,1 NGN network business analysis NGN network business analysis, mainly refers to the acquisition of data in the NGN network through the hardware interface of the test instrument, and the collected data is real-time and post-analysis. Test instruments can provide detailed decoding, call loss analysis, call flow association, call, and traffic statistics, specific device analysis, voice link monitoring playback, and the like. In general, NGN network business analysis is a monitoring solution for NGN networks that fully support various protocols in NGN networks, including: MGCP, SIP, H.248, SIP-T, SigTRAN, BICC, RTP / RTCP, etc., capable of end-to-end calls and specific device performance analysis can provide a large amount of objective data for optimal and management of NGN networks. It should be applied to a variety of different bearing networks, and the signaling can be correlated and analyzed, and various devices in the NGN network are statistically analyzed to obtain visualization process analysis, and the results of the statistical analysis can be output directly to specific formats. Documentation.
As shown in the figure above, in the NGN network business analysis, not only the business conditions of the network, but also analyze the business conditions of a single device in the network. Through the above statistical test, only a few tests can be fully understood, fully understand the business operations of the NGN network. For the comprehensive monitoring of the NGN network, the operator can quickly locate the network fault, quickly solve the network problem, objectively analyze network business status, provide statistical analysis of specific network devices, allow operators to pre-analyze possible network issues, Thereby reducing the chance of business failures, increasing operation and maintenance efficiency, and reducing operation and maintenance costs. 2, 2 NGN Network Business QoS Test NGN Network Basic Business is the voice service, the quality of voice quality directly affects the user's choice for operators, and the factors affecting voice quality are determined by multiple factors, including packet loss, Jitter, delay, along cutting, etc. Therefore, according to the requirements of the telecom network service quality (QoS), establish a set of objective assessment criteria, and quantitative analysis and measurement of the voice service quality of NGN networks will become a top priority, in front of the NGN network operator. At present, the voice QoS test method mainly has two types of primary test methods and objective test methods. Itu-TP.800 defines the subjective test method of MOS. The objective test methods are mainly: PSQM, PSQM , PESQ, etc. ITU-TP.862 (PESQ) is the current ITU recommended for end-to-end network voice quality testing. So as a voice service QoS test, while supporting MOS and PESQ is a more ideal test method. In order to flexibly determine the network voice quality, it is convenient to determine the network failure, and the tester for voice quality test should support both simulation lines and RTP flows, and can perform multiple concurrent tests. Providing a detailed business quality report to improve the satisfaction and loyalty of existing customers, but also enhance the competitiveness of operators before potential customers. 2,3 NGN Network Business Planning Test NGN Network Business Planning Testing refers to the use of test instruments to simulate multiple business users to test network business performance, which can provide a lot of objective data for NGN operator network business planning, which can also take testing Instruments to simulate new business users, providing a solid foundation for the opening and maintenance of new business. For NGN network operators, business planning testing can shorten business opening hours, reduce new business risks, and provide operational maintenance experience to operators, which can greatly reduce operators' business test fees. Shorten the time of new business. For business planning testing, basic business planning testing, interconnection business planning test, new business planning test. Through business planning testing, operators can provide existing business planning and new business opening plan, which can guarantee the feasibility and objectivity of business planning. 2, 4 NGN network equipment specification consistency test NGN network equipment specification consistency test refers to the signaling specified in the specification through the tester, compares the processing process of the NGN device for different signaling processes and the processing process specified in the specification. Also, the NGN network equipment is derived to conclusion. Whether the equipment to be employed by the operator is in line with the standard, and there is an important significance for the smooth development of the equipment. The difference between the equipment workflow and the specifications will give the interconnection between the devices, and the extension of operator business has brought a series of issues, resulting in an increase in operating costs. Adopting the standard consistency test not only allows operators to analyze the problem of existing networks in detail, but also test the network device to be selected to avoid this problem.
Therefore, the test instrument specification-consistent test must be an objective assessment of the device's interconnection ability and internal processing mechanism, and can be positioned and analyzed, analyzed, analyzed, and analyzed, and analyzed the operator to solve various by Problems caused by the difference in agreement. Since the operator network may use different manufacturers' equipment, and different equipment protocols may not be the same, in order to save test costs, standardizing consistency testers should be able to modify their test processes, adapt to normative consistency of different manufacturers. Test demand. As a tester specified consistency test, not only provide a simple protocol test, but also provide advanced test functions to meet the advanced test of the operator for the Advanced test of NGN devices, such as the error test of the protocol. 2,5 NGN network equipment Performance Test Network Initial Test Network, due to fewer business, it is not possible to effectively measure the processing power of the equipment. How to objectively evaluate network business capabilities, how to develop reliable business development plans are the issues that NGN network operators face. Therefore, an objective device performance test method is required to evaluate the processing power of the equipment, and provide objective basis for operator business development planning and network performance optimization. The so-called device performance test refers to a call to the softswitch to launch a large traffic to load the user's device to verify the performance indicators of the device, and objectively evaluate the processing capabilities of the device. By simulating a large number of call signaling, through increasing the processing call number of the device, check the device packet loss and the processing delay, to determine if the device reaches its maximum processing power. The performance test of NGN network equipment should include softswitch devices, SG, TG, IAD, AG, etc. Device performance tests, which is very important for NGN equipment input and network programs and network planning. Equipment performance test facilitates operation and maintenance personnel to learn more about the performance status of various devices in the network, and propose corresponding solutions to potential network issues. 3, NGN network test instrument in China NGN network test instrument is designed for NGN network, providing NGN network operators with accurate, effective, easy to use, meet practical test methods, suitable for NGN networks Daily operation maintenance, fault location exclusion, network equipment operating status analysis, business opening mating test, protocol, performance and consistency test analysis of NGN related equipment development and development. The voice quality analyzer adopts the PESQ algorithm, providing end-to-end voice service quality testing, providing operators with detailed voice quality analysis reports. The NGN network tester includes a plurality of modules that provide a comprehensive test solution, including NGN emulation, NGN monitoring, and voice quality testing three modules, which meet different test needs of operators. The following is a detailed description of each part. 3, 1 NGN Monitoring Part NGN monitoring part is mainly designed for NGN network statistical analysis. It provides call loss analysis, providing users with detailed call loss analysis results, easy to quickly locate network faults; provide graphical call flow synthesis functions, easy to analyze network problems more convenient; support statistical analysis for specific network devices , Display detailed network device service running status, expansion, prevent network failure, network performance optimization, providing monitoring monitoring function for RTP voice flow, users can easily and intuitively understand user voice service quality Provide customized reports and view output functions, statistical results can be output to Excel files, flow charts can make view output; provide an intuitive associated interpretation interface, click on the statistical interface to display detailed errors, so that users quickly solve problems; It not only provides comprehensive NGN network protocol support, but users can also choose the H.323 protocol to monitor the monitoring and analysis of VoIP networks.
