Wireless Network Management SANDEEP Network Management Network management is a service that employs a variety of tools, applications, and devices to assist human network managers in monitoring and maintaining networks. Configuration Management Performance Management Fault Management Accounting Management Security Management Network Management Architecture Network Management Configuration Management Monitors the Network and system configuration information Each network device has a variety of version information associated with it TCP/IP software Version 2.0 SNMP software Version 3.1 Performance Management Measures various aspects and make them available so that the inter network performance can be maintained. Network Management Fault Management Detects network problems log them and automatically fix them to keep the network running safely. Accounting Management Measures Network Utilization parameters. Security Management Controls unauthorized access to the network resources so that the network is not sabotaged. Wireless Network A wireless network is a computer network in which communication between machines occurs over a wireless link. Cellular networks Verizon, DoCoMo, etc. Satellite networks Iridium, Inmarsat, etc. Battlefield networks Communication between tanks, soldiers, etc. Wireless Local Area Networks (LAN) IEEE IEEE Overview Adopted in The Connectionless IEEE local networks define 2 topologies Infrastructure Network connected through APs Ad-Hoc Network peer-to-peer communication Overview, Architecture Infrastructure Network Overview, Architecture Ad-Hoc Network Steps 1. Discovery of New Access Point 2. Transfer of PIN 3. Registration Protocol runs as EAP (Authentication) method 4. New AP Settings sent Access Point Registrar Transfer of PIN Registration Protocol New AP Settings Discovery Securely Connected Setting Up a New Wireless Network Setting Up a New Member Device Enrollee Access Point Registrar UPnP Discovery UPnP Event Start (Authentic ation) EAP New Enrollee Notification Reads PIN from Enrollee Reads PIN from Enrollee Registration Protocol Continues Securely Connected Signal Monitoring System for managing the wireless Network To Manage the wireless networks system a signal monitoring system can be used. This system does not interfere with the regular network operations. Listens Measures Sends alarms System Architecture NETWORK MANAGEMENT CENTER PERFORMANCE MANAGER Cellular Network Scanning Receivers Implementation of the Management System There 2 high level versions of implementation Centralized Performance Manager Distributed Performance Manager FAULT MANAGEMENT SYSYTEM THE PERFORMANCE MANAGER THE NETWORK MANAGEMENT CENTER The Performance Manager The Scanner Interface The Measurement Database The Alarms Generator The NMC Interface Performance Manager Structure MEASUREMENT DATABASE ALARM GENERATOR SCANNER INTERFACE NMC INTERFACE The Performance Manager The Scanner Interface Two Modes Transmit Mode Downloads list of scanning channel identifiers and sends them to the associated scanner for measurements. Receive Mode collects the measured data from the scanners according to the list of channel identifiers previously sent for measurement. The Performance Manager The Measurement Database It is a Relational Database that stores the received data in the scanner interface (receive mode) It consists of tables The Performance Manager The Alarm Generator Periodically reads the measurements for each controlled scanner and each controlled base stations. Evaluates if any measurement is exceeding or going below the predefined thresholds, then it correlates with the measuring signals of same BST as well as the corresponding BST The Performance Manager The Alarm Generator If correlated results indicate poor coverage, the alarm generator generates an alarm to NMC and sends via NMC interface in performance manager structure. The Performance Manager The Alarm Generator Alarm contains the following information BSC identifier BST identifier Faulty channel identifier Alarm code Alarm description Scanner identifier Scanner location Timestamp Alarm severity The Performance Manager The NMC Interface It enables communication between the performance manager and the Network Management center It has two modes Transmit sends alarm from alarm generator to NMC Receive It receives the channel identifiers for each base station and forwards the list via scanner interface The Network Management Center The Performance Manager Interface The Management Information Base The Graphical User Interface The Network Management Center The Performance Manager Interface Two modes Transmit mode- Transmits the list of channels that are allocated for each BTS to NMC interface in Performance Manager Receive mode Receives alarm from the performance manager and stores them into MIB The Network Management Center The Management Information Base(MIB) The Management Information Base is a Relational Database which stores all the information. Each area has an Operator and a team of technicians. Each region consists of many areas and each region is managed by supervisor and all supervisors report one super user The MIB Structure SUPER USER SUPERVISOR1 SUPERVISOR2 SUPERVISOR3 Operater2Operater1Operater2Operater1Operater2Operater1 The MIB Organization The Network Management Center The Graphical User Interface NMC includes a Graphical User Interface containing a Geographic map of the network coverage area, with an overlay graphical presentation of the managed network elements and their Interconnections Some advanced GUI interfaces in network management systems have the following features Changing the color of the network element based on severity of the alarm Blinking occurs when the network element has some emergency Clicking on the network element gives the real time information about the element configuration and pending alarms The Graphical User Interface The Graphical user interface Conclusion The signal Monitoring system improves the reliability and the quality of service of a wireless network by efficient failure detection and location. It also improves the Overall network coverage and availability of network resources. References Jelena Vucetic, paul Kline: signal Monitoring system, IEEE Dynamic Telecommunications 1998 S. M. Dauber: Finding Fault, BYTE Magazine, McGraw-Hill, Inc. New York, NY, March 1991 0. Wolfson, S. Sengupta, Y. Yemini: Managing Communication Networks by Monitoring Databases, IEEE Transactions on Software Engineering m Vol. 17, No. 9, September 1991 L. Feldkhun: Integrated Network Management Systems, Proceedings First International Symposium on Integrated Network Management, 1989 Questions What are the Advantages of the Fault Management system? Ans: improves the reliability and the quality of service of a wireless network. What are the system design Considerations to be considered to while designing the Monitoring management system? Ans: No. of Scanners and the locations where they should be placed. For the cost to be minimum the no. of scanners should be less. How does this fault management system improve reliability and Network coverage? Ans: Efficient failure detection and also the location of the failure.