Browse Prior Art Database

Method to Force Statistical Multiplexing in ASTN Controlled Networks

IP.com Disclosure Number: IPCOM000017854D
Published in the IP.com Journal: Volume 3 Issue 8 (2003-08-25)
Included in the Prior Art Database: 2003-Aug-25
Document File: 6 page(s) / 131K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

The method described in this invention applies to a transport network where a service provider is providing a connection service to the service-user (client) on demand of the client. The client signals a connection request to the control of the transport network and the service provider then instantaneously provides this connection to the client. The new method enables the service provider to improve the utilization of the network resources by forcing the clients connected to the network to share the resources. The state-of-the-art method to offer dynamic bandwidth services today is based on a control panel approach where connections can be dynamically created and deleted. This is at the moment standardized by different standardization bodies, namely the "International Telecommunications Union - Transport" (ITU-T), the "Optical Internetworking Forum" (OIF) and the "Internet Engineering Task Force" (IETF). In this approach, signaling protocols (e.g. GMPLS, Generalized Multi-Protocol Label Switching) are used to set up or tear down a connection in the transport network. This is shown in figure 1. The entities of the control plane involved in the signaling are denoted with small letters, the corresponding transport hardware devices of the network elements (NE) are denoted with capital letters. The setup and the release of the connection are both achieved using both-way signaling. The main advantage of this ASTN (Automatic Switched Transport Network) is that the delivery can be guaranteed once the setup was successful. Also, connections with long holding times can be set up on the fly. However for an economical application of ASTN, the holding times are still too high and the number of clients in the start-up phase is too small.

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Method to Force Statistical Multiplexing in ASTN Controlled Networks

Idea: Arnold D. Monitzer, US-Reston

The method described in this invention applies to a transport network where a service provider is providing a connection service to the service-user (client) on demand of the client. The client signals a connection request to the control of the transport network and the service provider then instantaneously provides this connection to the client. The new method enables the service provider to improve the utilization of the network resources by forcing the clients connected to the network to share the resources.

The state-of-the-art method to offer dynamic bandwidth services today is based on a control panel approach where connections can be dynamically created and deleted. This is at the moment standardized by different standardization bodies, namely the "International Telecommunications Union - Transport" (ITU-T), the "Optical Internetworking Forum" (OIF) and the "Internet Engineering Task Force" (IETF). In this approach, signaling protocols (e.g. GMPLS, Generalized Multi-Protocol Label Switching) are used to set up or tear down a connection in the transport network. This is shown in figure 1. The entities of the control plane involved in the signaling are denoted with small letters, the corresponding transport hardware devices of the network elements (NE) are denoted with capital letters. The setup and the release of the connection are both achieved using both-way signaling. The main advantage of this ASTN (Automatic Switched Transport Network) is that the delivery can be guaranteed once the setup was successful. Also, connections with long holding times can be set up on the fly. However for an economical application of ASTN, the holding times are still too high and the number of clients in the start-up phase is too small.

A different method which benefits from statistical multiplexing is OBS (Optical Burst Switching), an optimized approach for packet based client traffic. The basic principles of OBS are shown in figure 2. Since more clients are able to share a resource, it is better utilized (figure 3). However, a certain packet loss probability cannot be neglected, and, due to the one-way signaling used, the delivery of a burst is not confirmed. Furthermore, OBS is optimized for data networks only.

To improve the network utilization in an ASTN, the concept of preemptive traffic had been introduced. Figure 4 shows an example where an established low priority connection is released in order to establish a high priority connection. This increases the network utilization, but the holding times of higher priority connections still remain relatively high. Another problem is that the quality of service (QoS) cannot be guaranteed for all but the highest priority connections. To avoid this disadvantages, this invention proposes to protect connections for a certain period of time if requested. This enables the application to send out...