Connection-oriented real-time communication for mission critical applications-an introduction to NetEx: a portable and efficient tool kit

Abstract

We report our project aimed at the design and implementation of a mid-ware tool kit, called NetEx, that provides deadline-guaranteed and connectionoriented communication services at the application layer. NetEx comprises of a Host Traffic Manager (HTM) and a Network Traffic Manager (NTM). An HTM resides in each participating host while the NTM can be implemented either at a central host or in a distributed manner. The HTM performs traffic scheduling and enforces traffic regulation at individual hosts. The NTM is the decision maker on connection admission control. We argue that portability and efficiency are two fundamental issues one has to address in the design of such a middleware tool kit. We present strategies adopted by NetEx in order to support portability and efficiency. We report system performance based on several benchmarks.

Efficient resource management for hard real-time communication over differentiated services architectures

“…Some of the proposals have been implemented and deployed within the IntServ architecture, for example, NetEx, RSVP, and Tenet. NetEx [6], for example, is based on extensions of Cruz's methodology for delay analysis [1], and provides a connectionoriented real-time communication service by relying on strict admission control [5]. RSVP [2] has been proposed as the signaling and resource reservation in the IntServ architecture.…”

Adaptive connection admission control for mission critical real-time communication networks

“…NetEx is a library of communication primitives that enables user applications to participate in delay guaranteed communications [DLSZ97,SLDZ97]. Our implementation is compatible with several standards and recommendations on QoS framework such as [ATM95,IT96].…”

Scalable QoS guaranteed communication services for real-time applications

“…Some of the proposals have been implemented and deployed, for example, NetEx, RSVP, and Tenet. NetEx [2,3] is a good working example of implemented system based on extensions of Cruz's methodology for delay analysis [4,5,6]. RSVP [21] has been proposed as the signaling and resource reservation in the Integrated Services architecture.…”

“…In order to evaluate the performance (in terms of admission probability and of admission control overhead) of our class-based approach, we ran a suite of simulation experiments to compare it with two forms of connection oriented admission control systems: (1) NetEx [2,3] has been selected as a generic connection oriented admission control with static priority system packet forwarding. (2) Virtual Clock [7,9] has been selected in order to study whether there is any difference in using a guaranteed rate scheduling policy such as Virtual Clock as opposed to a simple class-based policy.…”