Resource Management for Ad-Hoc Wireless Networks with Cluster Organization

Boosted by technology advancements, government and commercial interest, ad-hoc wireless networks are emerging as a serious platform for distributed mission-critical applications. Guaranteeing QoS in this environment is a hard problem because several applications may share the same resources in the network, and mobile ad-hoc wireless networks (MANETs) typically exhibit high variability in network topology and communication quality. In this paper we introduce DYNAMIQUE, a resource management infrastructure for MANETs. We present a resource model for multi-application admission control that optimizes the application admission utility, defined as a combination of the QoS satisfaction ratio. A method based on external adaptation (shrinking QoS for existing applications and later QoS expansion) is introduced as a way to reduce computation complexity by reducing the search space. We designed an application admission protocol that uses a greedy heuristic to improve application utility. For this, the admission control considers network topology information from the routing layer. Specifically, the admission protocol takes benefit from a cluster network organization, as defined by ad-hoc routing protocols such as CBRP and LANMAR. Information on cluster membership and cluster head elections allows the admission protocol to minimize control signaling and to improve application quality by localizing task mapping

Hierarchical architecture for real-time adaptive resource management

Abstract. This paper presents the Real Time Adaptive Resource Managemen

High Speed ATM Network Support for Video-Based Distributed Applications

Video traffic is expected to be the predominant type of multimedia traffic generated by distributed multimedia applications. In terms of bandwidth, real-time delivery and loss, it is also one of the most demanding on both the network and host systems. This paper presents the performance of JPEG (Joint Photographic Experts Group), MPEG-1 (Moving Picture Experts Group), and MPEG-2 coded video over a local Asynchronous Transfer Mode (ATM) network. TCP (Transmission Control Protocol) and the UDP (User Datagram Protocol) are used as the transport protocols. The performance in terms of delay (jitter) and frame loss, as a function of load, are presented and discussed. The appropiateness of using TCP and UDP over an ATM network to transmit periodic bursty sources, such as coded video, are discussed. When the hosts and the network are stressed, the experimental data reveal that the burstiness of the variable bit rate coded video streams is a significant factor in the resulting performance degra..