Research And Design Of Next Steps In Signaling Based On Java Implementation

Traditionally, based on store-and-forward mechanism, Internet can provide users with only a best-effort service. This means that if excessive load on the network router, Internet can not guarantee quality of service. However, in a global IP(Internet Protocol) network convergence trend, users for different applications have different QoS(quality of service) requirements. The QoS guarantee technology can ensure the network to allocate and schedule resources according to customers'requirements.The existing solutions of QoS are mainly based on RSVP(Resource Reservation Protocol). Howerver, there are arrays of shortcomings in RSVP such as mobility and scalablity. Thus, my research introduces NSIS(Next Steps in Signaling). This thesis first introduces the existing QoS signaling, analyzes the main features and communication procedure of RSVP, and illustrates the shortcomings of RSVP. Then based on the disadvantages of RSVP, this paper introduces NSIS, demonstrates NTLP(NSIS Transport Layer Protocol) and NSLP(NSIS Signaling Layer Protocol) in NSIS, and gives a comparision between RSVP and NSIS respecting various QoS basic features.Following that, this thesis illustrates the deployment of NSIS based on Java implementation, analyzes the module components and their relationship of NTLP and NSLP, deploys the testbed of NSIS, and verifies the connectivity of NSIS testbed. Next, to overcome the shortcomings of fixed refresh period of NSIS, this paper proposes the algorithm of scalable refresh period, sets up a NSIS message queue model, and verifies the fact that the algorithm could reduce the delay of NSIS and the waste of network resource effectively.In order to realize the algorithm of optimalization refresh period and enhance the convenience of NSIS operation, this paper eventually proposes a NSIS GUI(Graphics User Interface) based on Java implementation and verifies the fact that we could operate NSIS normally by using GUI, which is convenient for operation and management of NSIS.