Autonomous Routing Subsystem In Context-Aware Autonomous Network

With the continuous development of network and the popularity of wireless networks, users are no longer satisfied to visit the resources in the same network, but propose a further requirement to gain end-to-end services which may pass a hybrid network composed by both wireless networks and wired networks. In the hybrid network, as a key factor, the link instability and the bandwidth limitation of wireless links often restrict the performance of end to end network services.Autonomous network architecture as a new type of architecture is a main developing direction and research trend of the future network architecture. Through introducing autonomous attributes (e.g. self-organization, self-optimizing, self-management, and self-configuration) into the network architecture, following self-sensing context information, the network functional entities can dynamically make optimal decisions and reduce the complexity of network management."Autonomous Routing Subsystem in Context-aware autonomous network" is a sub-topic of the 863 projects--"Context-aware based Autonomic Network Model". This sub-topic focuses on researching the context-aware routing mechanism under the autonomous network framework, researching how to implement routing across hybrid networks, included wired network with IPv6 protocol and Ad hoc networks and researching how to optimize the network performance with self-* attributes, in particular, in the wireless part of the hybrid networks.This paper describes the design and realization of an Autonomous Routing Subsystem, which aims to meet the requirements of hybrid routing and to solve the poor stability problem of wireless network links. This system adds a new wireless interface type into OSPFv3 protocol, and generates a unified network topology of the entire hybrid network for routing calculation. To reduce the network load produced by the change of new wireless interfaces' adjacency relationship, this system only establishes adjacency relationships between neighbors in MultiPoint Relay set, referencing to MPR-OSPF protocol. In addition, this paper also presents a study on the algorithm of calculating MPR set, which combined context information with the original algorithm in OLSR protocol to improve the stability of data transmission, and gives the performance verification of the optimized algorithm--CAMPR (Context aware MPR)--through NS2 simulation. The system chooses Quagga routing software suite as the implementation platform, and implements extensions to achieve the objectives of this system on the basis of ospf6d daemon given in Quagga.This paper firstly analyzes the current network status, describes network routing protocol and the development of autonomous network and introduces the concept of control loop and the network architecture model defined in CAANM. And then, it describes the composition of the autonomous routing subsystem, as well as the linkages between different parts. It analyzes the algorithm in details which is used in the decision-making modules to choose the wireless relay link dynamically and autonomously, and gives the evaluation of its performance. After the description of the routing subsystem's realization, the test result is also introduced in this paper, Finally, this paper gives the shortcomings of the work and further possible research directions are summarized.