Flow Control Machenism For Heterogeneous Network Coordination In Context-A Ware Environment

Wireless communication network is rapidly evolving towards the heterogeneous network convergence characterized by technologies such as sensing network, artificial intelligent algorithms, radio resource management and so on. As one key technique of heterogeneous network convergence, heterogeneous network coordination is a hotspot. Simultaneously establishing an experimental platform and showing context-aware heterogeneous network coordination scenarios is necessary. In the process of technology researching and engineering implementation, a context-aware flow control mechanism for heterogeneous network coordination, which is proved to satisfy requirements of high data rate, low latency and self-adaptability, is designed. Based on network architecture research and functional modules design, this thesis focuses on the implementation issue.The tasks of this thesis are mainly based on the National 863 Project "Research on key technologies of cognitive convergence of PAN and WAN" under contract 2009AA01Z262. The project targets to study cross-layer multi-filed sensing and reasoning technique, flexible radio resourse management, heterogeneous network coordination and intelligent reconstruction methods. Then, a platform to demonstrate above key technologies is supposed to implement. The author is responsible for the research and design of context-aware reasoning techniques and implementation of heterogeneous network coordination platform part. A Context based Feedback Flow Control (C-FFC) algorithm aiming at addressing the problem of optimizing flow control for heterogeneous network access with rich context information in environment and considering different QoS requirements of mobile users is presented. Three scenarios are simulated in this paper and the simulation results show improvement in term of increasing utilization ratio and enhancing network flexibility, while maintaining QoS requirements and ensuring fairness between mobile users.The main works of this thesis include:1. Studied 3GPP SAE/IMS technical specifications and network architecture, then analyzed functions of network elements and their interaction signaling procedures.2. In the process of platform implementation, studied cross-layer multi-field sensing and reasoning methods and heterogeneous network coordination technique, designed adaptive multi-streaming transport scenario with multi terminal equipments in, and implement all function modules and signaling interaction of the platform in LINUX.3. In context-aware heterogeneous network coordination machnism, the author designed dynamic adaptive flow control algorithm based on context and simulated three typical heterogeneous network scenarios. A deep analysis was presented at the end of the paper.