The Design And Simulation Of QoS Signal Mechanism In Self-Organizing Network

With the rapid development and people's increasing demand of intelligence of network technology, many new kinds of network technology are widely used, and the concept of self-organizing network was proposed. A mobile self-organizing network (Ad Hoc) is a collection of wireless mobile nodes dynamically forming a temporary network without the use of any existing network infrastructure or centralized administration. Typical application scenarios of Ad Hoc network are tactical networking, conference and disaster recovery operations.Recently, the rising popularity of multi-media applications among end users in various networks, the potential usage of Ad Hoc network in civilian life has led to research interest in providing QoS support in mobile Ad-hoc networks. The own features of Ad Hoc network such as dynamic network topology, limited bandwidth and power make the QoS related technology in Ad Hoc to be very different from classical fixed wired networks.In order to provide ensured QoS for end-to-end communications between two nodes, some QoS signal protocols are needed. The RSVP signal which has great development in fixed wired networks and its extensions in wireless networks such as MRSVP, DRSVP cannot solve the problem fundamentally, nor could INSIGNIA which was first developed for Ad Hoc since it was complicated and had limited scalability. Therefore, we introduced S-INSIGNIA signal, and based on this protocol we designed a simple QoS signal system which could make fast reservations in in-band signals through one-step reservation mechanism and supporting multi reservation modes (exclusive and sharing) in order to solve the existing QoS problems in Ad Hoc networks.The thesis first introduces the related technology such as self-organizing network, network simulation technology and OPNET environment, based on this it introduces the current development of QoS support such as QoS model, QoS routing, QoS signal in Ad Hoc network. The thesis analyzes characteristics when designing QoS signal system for self-organizing network, and introduces the design of QoS signal system based on S-INSIGNIA protocol, including the design of S-INSIGNIA signal protocol, signal interactive flow and channels, followed by the QoS signal system simulation and testing in OPNET. Finally it illustrates the problems in current system and points out the directions in the following research.