We evaluate the connection provisioning performance of GMPLS-controlled wavelength routed networks under dynamic traffic load and using three different wavelength converter placement heuristics. Results show that a simple uniform placement heuristic matches the performance of complex heuristics under dynamic traffic assumptions.
The hybrid optical wireless network has gained interest for future access networks. In order to guarantee quality of service (QoS), especially for the multi-media services, resource management and scheduling mechanism become critical design issues in the hybrid optical wireless network. Various scheduling algorithms have been proposed in either optical (EPON) or wireless (WiMAX) domains. However, none of these algorithms has considered the end-to-end QoS for a connection communicating through both two domains. In this paper, we come up with an idea to modify the original signalling protocol in the optical domain, and use it to design a novel Integrated Optical Wireless Admission Control (IOW-AC) in an uplink scheduler. From both analysis and simulation, QoS requirement in terms of delay is guaranteed and the utilization of bandwidth resources is improved.
A statistical model of the aggregation operation in an optical packet based network interface is presented. The operation
aggregates client-layer packets into optical slots, and includes a timeout parameter to limit the maximum delay.
Aggregation serves the purpose of providing an efficient filling of the large optical slots with smaller packets from the
client layer. The model will be utilized to derive an optimal choice of timeout parameter that will lead to an efficient
utilization of the optical packets.
This paper discuss the different possible multiplexing structure for an optical network - in a broad sense ranging from all optical networks including optical switching to optical networks “as we know them” mainly using optics for the transmission.
Although the vision for the future Integrated Broadband Communication Network (IBCN) is an all optical network, it is certain that for a long period to come, the network will remain very heterogeneous, with a mixture of different physical media (fiber, coax and twisted pair), transmission systems (PDH, SDH, ADSL) and transport protocols (TCP/IP, AAL/ATM, frame relay). In the current work towards the IBCN, the ATM concept is considered the generic network protocol for both public and private network, with the ability to use different underlying transmission protocols and, through adaptation protocols, provide the appropriate services (old as well as new) to the customer. One of the major difficulties of heterogeneous network is the restriction that is usually given by the lowest common denominator, e.g. in terms of single channel capacity. A possible way to overcome these limitations is by extending the ATM concept with a multilink capability, that allows us to use separate resources as one common. The improved flexibility obtained by this protocol extension further allows a real time optimization of network and call configuration, without any impact on the quality of service seen from the user. This paper describes an example of an ATM based multilink protocol that has been experimentally implemented within the RACE project 'STRATOSPHERIC'. The paper outlines the complexity of introducing an extra network functionality compared with the added value, such as an improved ability to recover an error due to a malfunctioning network component.
With the ever increasing importance of the possibility to exchange electronic information an important attempt has been taken to base the next generation of communication network on a concept that seems enable to cover the need for future communication. The concept selected for this purpose is called ATM, that with its flexibility and potential good utilization of the network resources is expected to be `the solution to every demand.' However, it still remains to be solved how the statistical multiplexing, that insures a good network utilization, can be applied without strong restriction specially on the bandwidth side. This paper covers some of the aspects of being able to provide broadband services and still gain from statistical multiplexing.
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