B. Devalla, C. Li, A. Sahoo, and W. Zhao, \Connection-oriented real-time communication for mission critical applications-an introduction to NetEx: a portable and ecient tool kit," Aerospace and Electronics Conference, NAECON 1997.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....on current computer networks purely depends on the dynamic load of network links. A number of schemes have been proposed for network services that provide QoS guarantees. Some of the proposals have been implemented and deployed within IS architecture, for example, NetEx, RSVP, and Tenet. NetEx [11, 21], for example, is based on extentions of Cruz s methodology for delay analysis [4] and provides a connection oriented real time communication service by relying on strict admission control [8] RSVP [5] has been proposed as the signaling and resource reservation in the Integrated Services ....

B. Devalla, C. Li, A. Sahoo, and W. Zhao, \Connection-oriented real-time communication for mission critical applications-an introduction to NetEx: a portable and ecient tool kit," Aerospace and Electronics Conference, NAECON 1997.

....APIs specified in Section 4. The network resource negotiation service can be implemented in several ways. One is to use the RSVP, as described in Appendix A. Another, as we have planned, is to interface the NetEx a transport level real time network scheduler developed by Texas A M University [6,7,24]. Task and resource classes Task is an abstraction general to all the resources and their agents. It represents a unit of resource management for a given resource agent, and is implemented by a C template class. For example, a list of threads belonging to a subsession on a computing node is ....

B. Devalla, C. Li, A. Sahoo, and Wei Zhao, "Connection-Oriented Real-Time Communication for Mission Critical Applications," Proc. of IEEE National Aerospace and Electronics Conference, July 1997.

....Finally admission control has been investigated as well [12, 14, 18] Much of this work addresses admission control and packet scheduling. Some deal with meeting end to end delay requirements. 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 extentions of Cruz s methodology for delay analysis [4, 5] Essentially, NetEx provides connection oriented real time communication service by relying on a strict admission control [6] RSVP [21] has been proposed as the signaling and ....

....delay guarantees. In this paper, we propose a system of admission control and packet forwarding schemes that guarantee end to end delay for each ow in a DS architecture [28] By having o line end to end delay computation, our admission control complexity is de nitely lower than those of [2, 3, 4, 5, 6, 8, 22], while guaranteeing end to end delay deadlines for all ows. Also, we argue that our system s runtime overhead should be lower than that of [8] because we use class based static priority scheduling. To the best of our knowledge, this is the rst proposal addressing end to end delay guarantee and ....

[Article contains additional citation context not shown here]

B. Devalla, C. Li, A. Sahoo, and W. Zhao, \Connection-oriented real-time communication for mission critical applications-an introduction to NetEx: a portable and ecient tool kit," Aerospace and Electronics Conference, NAECON 1997.

....admission control has been investigated as well [16, 18, 22] Much of this work addresses admission control and packet scheduling. Some of it deals with meeting end to end delay requirements. Some of the proposals have been implemented and deployed, for example, NetEx, RSVP, and Tenet. NetEx [6, 7] is an example of an implemented system based on extensions of Cruz s methodology for delay analysis [8, 9] Essentially, NetEx provides connection oriented real time communication service by relying on strict admission control [10] Tenet Scheme II [26] uses a two pass resource allocation scheme, ....

.... In this paper, we propose a methodology of admission control and packet forwarding schemes that guarantee end to end delays for all ows within a di erentiated service network [32] By having o line end to end delay computation, our admission control complexity is de nitely lower than those of [6, 7, 8, 9, 10, 12, 26], while guaranteeing end toend delay deadlines for all ows. Also, we argue that our system s run time overhead should be lower than that of [12] because we use class based static priority scheduling. To the best of our knowledge, this is the rst proposal addressing scalable end to end delay ....

B. Devalla, C. Li, A. Sahoo, and W. Zhao, \Connection-oriented real-time communication for mission critical applications-an introduction to NetEx: a portable and ecient tool kit," Aerospace and Electronics Conference, NAECON 1997., on Pages: 698 - 707 vol.2 1997.

....have been proposed [9, 10, 15, 16] Also, many packet scheduling mechanisms have been provided [7, 11, 13, 17, 19, 20, Finally, admission control has been investigated as well [12, 14, 18] 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. Tenet Scheme II [22] uses a two pass resource allocation scheme, ....

....5. Experimental Evaluation 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 ....

B. Devalla, C. Li, A. Sahoo, and W. Zhao, "Connectionoriented real-time communication for mission critical applications-an introduction to NetEx: a portable and efficient tool kit," Aerospace and Electronics Conference, NAECON 1997., on Pages: 698 - 707 vol.2 1997.

....on the system s current loading condition. All these heuristics intend to reduce the time taken to search without compromising too much on other performance measures. 4.4. Implementation and application The heuristic CAC algorithm has been in the newer version of our real time toolkit, NetEx (Devalla, Li, Sahoo Zhao, 1997). NetEx is a library of communication primitives that enables user applications to participate in delay guaranteed communications. NetEx consists of three main components: user library, a Host Tra c Manager (HTM) and a Network Tra c Manager (NTM) The user library is the interface of NetEx to the ....

....Tra c Manager (NTM) The user library is the interface of NetEx to the end users. HTM is the module responsible for managing and policing tra c at the host. NTM is primarily responsible for the connection management of the entire system. For a detailed description of NetEx architecture refer to Devalla et al. 1997). The design of a software architecture is in#uenced by many potentially con#icting requirements. In the previous version of NetEx, a traditional connection management (TCM) was used. In the new version TCM has been replaced with adaptive connection management. Its key component is the adaptive ....

Devalla, B., Li, C., Sahoo, A., & Zhao, W. (1997). Connection-oriented real-time communication for Mission critical applications * an introduction to netex: a portable and e$cient tool kit. Proceedings of IEEE NAECON (pp. 123}135).

....11, 14] Admission control has been investigated as well [12, 13] Much of this work addresses admission control and packet scheduling. Some of it deals with meeting end to end delay requirements. Some of the above proposals have been implemented and deployed, for example, NetEx, and Tenet. NetEx [5] is an example of an implemented system based on extensions of Cruz s methodology for delay analysis [6] Tenet Scheme II [15] uses a two pass resource allocation scheme, and has extensive supports for multi party communication. While they provide real time services, they are not scalable to a ....

B. Devalla, C. Li, A. Sahoo, and W. Zhao, "Connection-oriented real-time communication for mission critical applications-an introduction to NetEx: a portable and efficient tool kit," Proc. of NAECON, 1997.

....as those in submarine, aircraft, or industrial process controllers) demand Quality of Service (QoS) guarantees in terms of bounded message transfer delays. These applications preferentially use connection oriented services as they are well suited for applications that demand performance guarantees [3]. A connection can be viewed as a contract between an application and the connection management system. A realtime connection is characterized by stringent deadline constraints imposed on its packet delivery time. Fault tolerant real time connections require that the messages be delivered within ....

B.Devalla, C. Li, A. Sahoo, and W. Zhao. Connection oriented real-time communication for mission critical applications. In Proceedings of IEEE NAECON, pages 698--707, 1998.

....This work involved guaranteeing deadline of connections at the MAC layer. We will extend this project to provide guarantee at the application layer for hard real time embedded systems. We have envisioned to do it by incorporating our CAC for heterogeneous network into our NetEx software suite [6]. We plan to evaluate the performance of our CAC in a real world ATM based heterogeneous network in the test bed of our Distributed Computing Laboratory. ....

Devalla B., Li C., Sahoo A., Zhao W., "Connection-Oriented Real-Time Communication for Mission Critical Applications - An Introduction to NetEx A Portable and Efficient Tool Kit" - Proc. of NAECON, June 1997.

....resource allocation. We address the above issues in the design of ACM. ACM has been implemented in the newer version of our real time toolkit, NetEx, over an ATM network. 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] 1.3 Previous Work The U.S. DoD has laid special emphasis on improving the responsiveness, security and reliability of communication services that play a critical role in current ....

....a simplex fixed route connection called real time channel, variations of the type defined in [Fer90] A real time channel is essentially a virtual circuit with performance guarantees. Various connection management approaches for guaranteeing performance of realtime channels have been suggested in [Par92, AKRS94, KSF94, MZ95, Cru95, MIS96, Rah96, DLSZ97]. Connection management is addressed in terms of scheduling policies, traffic regulation methods, and analysis of delay and buffer constraints. The aforementioned studies deal with QoS specified as fixedvalues. Dynamism in connection management is discussed in [PVZ93, PZF94] More recently, an ....

B. Devalla, C. Li, A. Sahoo, W. Zhao, "ConnectionOriented Real-Time Communication for Mission Critical Applications: An Introduction to NetEx," Proceedings of NAECON '97, pp. 698-707, July 1997.

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B. Devalla, C. Li, A. Sahoo, and W. Zhao, "Connectionoriented real-time communication for mission critical applications-an introduction to NetEx: a portable and efficient tool kit," Aerospace and Electronics Conference, NAECON 1997., pp. 698 - 707 vol.2 1997.

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