Based On Bandwidth Detection In Ad Hoc Multi-path Qos Routing Protocol

Wireless Ad Hoc Network has a broad application prospect in the military and emergency network communication because of its flexible and easy to construction characteristic. However, Ad Hoc networks use shared wireless channel, the resources are limited, how to use the scarce wireless resources more effectively to improve network performance, and how to provide QoS for high-level services, has been a research hotspot. The premise of efficient use of wireless resources is to estimate the wireless link status in time and accurately. This paper analyzed the existing Ad Hoc networks bandwidth estimation algorithm, proposed a accurate estimation algorithm, combined with Ad Hoc network multi-path routing strategy, proposed a wireless bandwidth estimation based Ad Hoc multi-path QoS routing protocol. Specific studies are as follows:(1) This paper analyzed the factor that impact the quality of Ad Hoc network link and the presentation of Ad Hoc network bandwidth, studied the existing active and passive estimation method as a basis for improvement, proposed a piggyback based PBBE bandwidth estimation algorithm, this paper also proposed a idle time based LBE algorithm as improvement. Through mathematical derivation and simulation proved that this algorithm further improved the estimation accuracy compared with PBBE.(2) After the analysis of the characteristics of Ad Hoc multi-path routing protocols, this paper focused on the comparing of parallel transmit strategy and backup strategy based on AODVM, and obtained the conclusion that there is no advantage with parallel strategy in Ad Hoc networks. This conclusion is the foundation for multi-path QoS routing protocol design.(3) This paper also combined the wireless link bandwidth estimation and the backup multi-path routing strategy, proposed bandwidth estimation based multi-path QoS routing protocol QB-AODVM based on AODVM. Simulation analysis proved that QB-AODVM has good QoS performance.The main contribution of this paper is to propose two Ad Hoc wireless bandwidth estimation algorithm, combined with multi-path routing protocol and used for Ad Hoc network QoS guarantee to ensure the bandwidth requirement. This paper provided a idea in Ad Hoc network QoS routing, also laid a foundation of research.