Access Network Learning notes

There are still many access network methods in China, and the market demand for various technologies is also increasing. Many people may not understand the access network. It doesn't matter. After reading this article, you will certainly have a lot of GAINS, I hope this article will teach you more things. The mobile communication network is a rare method to introduce direct station to solve network coverage and reduce operation costs. In order to effectively improve the network O & M and service level of the mobile network, reduce maintenance costs, and build a centralized monitoring and management system for the direct release station, The system implements "centralized control and unified supervision" for different types of direct release stations provided by many manufacturers ", it is imperative to build an effective direct station monitoring and management system. Currently, there are many direct station equipment manufacturers with different types and models, and the monitoring protocols of different direct station manufacturers are not uniform. Most of them do not have their own OMC, it is particularly important to quickly build a direct station monitoring and management system and use it to make full use of its production efficiency.

I. general requirements of the centralized monitoring system for direct release Stations

1. Overall system design principles
The centralized direct station monitoring and management system is generally built at the provincial level. The unified direct station management protocol of the group company provides a standard and basis for the construction of a centralized direct station monitoring system. The design of the direct station monitoring and management system must comply with the Telecommunications Management Network (TMN) specifications and relevant technical specifications, and fully consider the stability of the development of the centralized monitoring and management system of the direct station and the communication capability through the SMS center, provides flexible access and networking methods for Network Element access networks, with the increasing requirements of centralized monitoring and management functions, the centralized monitoring and management system can be expanded to meet the increasing network management needs.

The direct release station management system should be open and compatible, and require strong stability and powerful processing capabilities to meet unattended needs and provide standard external interfaces, it facilitates integration and information sharing with other systems, provides perfect storage and management methods, powerful data processing and statistical analysis functions, and friendly and convenient management and operation and maintenance interfaces, easy system maintenance. The system provides a complete system framework to facilitate system resizing.

2. Key features of the system
The centralized direct Station Monitoring and Management System is based on "centralized control and unified supervision" for direct stations in the province ". The following basic management functions must be implemented for centralized monitoring of the network management system on the direct release site: topology Management and network monitoring, configuration management and configuration statistical analysis, alarm monitoring and fault management, report management and Custom reports, operation management, timed round robin, system management, and security management.

Ii. Features of the mobile communication network management system platform

The basic architecture of the mobile communication network management system platform. This platform provides a basic framework module for building a complete network element management solution, different types of network management system solutions can be built by loading different collection logic, business processing logic, and upper-layer applications. The architecture of the basic network management platform adopts strict hierarchical design ideas, program processing logic and processing program separation technology to construct the logical layers of the Network Element access layer, data ing layer, business processing layer, and upper-layer applications, each logic layer system provides corresponding basic modules.

Currently, mature mobile communication network management systems on the market basically adopt the software architecture shown in Figure 1. They are mainly divided into three layers: data collection and interface equipment, it is mainly responsible for collecting data from the Network Element and providing interfaces for other network management systems. It is a data processing layer device in the middle to complete the system data storage and data processing functions. It adopts a dual-channel database and message platform approach, it ensures real-time data processing and shares the system load. The upper layer is the application service processing device, which is used to process applications that meet user business needs. The underlying data collection layer uses the separation technology of the collection logic and the collection module, and is committed to providing a complete set of tools to support access networks of various network elements, such as code streams, files, databases, messages, and other access methods. You can quickly access the network by simply modifying or adding a collection and processing logic unit of the direct station network element, and build a framework for the centralized monitoring system of the direct station, in addition, advanced users can use configuration files to customize the collection logic.

The intermediate data processing layer is responsible for data aggregation, conversion, message distribution, and post-processing at the core layer. You can use the Custom Data Summary template provided by the centralized monitoring and management system of the direct release station to achieve simple data summary, including filtering during busy hours and simple meta-level summary. There is no need to adjust the hierarchy. You only need to simply convert the corresponding ing relationship. The upper application layer provides a series of ready-made application modules to directly serve the application function requirements of direct release station monitoring, such as the monitoring module, intelligent inspection, centralized operations, and configuration management.

Iii. Overall Scheme of the direct release Station Monitoring and Management System

1. Introduction to the overall system structure
System Construction usually takes the Province as the unit and builds a provincial monitoring center in the provincial network management center. The monitoring center provides connections through the SMS gateway SMG) to the short message service center SMSC, the Short Message Gateway supports the standard SMPP3.3 protocol and SGIP1.2 protocol, which helps to collect the status information and alarm information of the direct station and exchange control information such as SMS with the direct station. Centralized monitoring and management systems of each direct station and direct station can also use wireless data transmission to exchange information.

A high-performance hardware server is configured in the provincial monitoring center to complete the collection of direct station status data, database operation, management of direct station operations, and other system functions, and manage direct station equipment throughout the province. Municipal monitoring centers in various regions are connected to provincial monitoring centers through the existing network management system DCN resources to complete data transmission. Municipal monitoring centers in different regions do not have any hardware servers. You only need to configure a local maintenance terminal to log on to the provincial monitoring center to complete management of the direct station. The System Center Server is mainly responsible for system databases, data collection, message transmission, fault processing, and other servers. It is the core part of the centralized monitoring and management system of the direct release station. The Web/application server is responsible for data publishing. The Web server is responsible for processing various management requests sent by the user's front-end machine and returning the processing results to the front-end workstation in Web form, for example, you can customize the intelligent inspection function of scheduled round training and publish management information. a pc server is used.

PC terminal, provincial center monitoring terminal and city monitoring terminal. The provincial center monitoring terminal runs the network management application, provides Man-machine interfaces between the Administrator and the network management system, and centrally monitors and manages the application; the local monitoring terminal accesses the application server of the network management center to monitor, maintain, debug, and manage the direct release stations in the local area. At the same time, you can view and delete and modify the relevant direct release site configuration through a Web browser, monitors the alarm information of the direct station in real time, and queries the scheduled training results and related report data of the direct station.

In the design of the hardware platform, the direct station monitoring system fully takes into account the scalability of the system. It designs a distributed collection array for a large number of direct station network elements to ensure the access capability of the monitoring system, it provides smooth function expansion and can develop new applications for further functional requirements of carriers.

2. Access Network Solution for the direct release Station
(1) Short Message Access Network
The direct station and the monitoring server communicate with each other through a wireless communication link. The built-in Modem of the direct station establishes communication with the master server of the monitoring center through short messages. The master server of the direct station uses SMPP or SGIP protocol to communicate with the SMS gateway. The direct station communicates with the SMS gateway through short messages. The direct station monitoring system is connected to the SMS gateway in the form of an SP.

(2) Direct Connect to the live station using wireless Modem
In the early days, some direct station devices were connected through wireless data transmission. This type of equipment interacts with each other through the wireless Modem on the central server side of the direct station's centralized monitoring system and the device side of the direct station. During data collection or monitoring and maintenance, the devices perform wireless dial-up on the direct station side, establishes wireless communication connections to achieve information interaction. When the device side of the direct station fails, the Modem on the direct station pulls the number from the network management center to send the alarm information to the network management center.