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Low Earth Orbit (LEO) satellite networks are expected to provide a variety of multimedia applications. In order to satisfy different QoS requirements and optimize utilization of network resources, a novel traffic classification routing algorithm (TCR) is proposed. The key technique of TCR is investigating the traffic classification link-cost metrics (TCM) for different traffic classes, which selects...
We study the privacy compromise due to a queuing side channel which arises when a resource is shared between two users in the context of packet networks. The adversary tries to learn about the legitimate users activities by sending a small but frequent probe stream to the shared resource (e.g., a router). We show that for current frequently used scheduling policies, the waiting time of the adversary...
We consider the problem of latency-optimizing file splitting for transmission over a large multi-hop network. We utilize recent results from random matrix theory to analytically express the latency distribution as a function of the relevant network parameters and the file size. The resulting minimax problem can be solved using standard nonlinear programming techniques for a variety of latency metrics...
We consider the problem of joint service rate control and load balancing of a network of servers. The system incurs holding cost, effort cost, and a routing cost whenever a demand is routed to other servers. This formulation is motivated by recent interest on energy efficiency in IT systems where effort cost models power consumption and holding cost represents performance in terms of delay. The aim...
The performance of TCP-based applications depends on the selection of queue management mechanism in network routers and how well its control decisions are made. Fast Congestion Notification (FN) mechanism enables the two control decisions, packet admissions and congestion control directing, to be made together. This permits sending congestion avoidance notification as early as required, even if the...
This paper proposes the two extensive data delivery schemes of Query-based PMIPv6 (Q-PMIPv6) and Signalling Query-based PMIPv6 (SQ-PMIPv6) in wireless networks. In the proposed Q-PMIPv6 scheme, when a correspond node (CN) sends the data packet to mobile node (MN), the Mobile Access Gateway (MAG), which CN is attached to, will send the binding query messages to Local Mobility Anchor (LMA) to get the...
We study the optimal control of communication networks in the presence of heterogeneous traffic requirements. Specifically, we distinguish the flows into two crucial classes: inelastic for modeling high-priority, delay-sensitive, and fixed-throughput applications; and elastic for modeling low-priority, delay-tolerant, and throughput-greedy applications. We note that the coexistence of such diverse...
QoS Routing Algorithm is a routing algorithm for finding the shortest path that satisfies the QoS requirements of the end users. While finding the shortest path this uses some of improved ideas for effectively finding the shortest path with required QoS measures. Exactly the QoS routing algorithm is a kind of multi constrained routing algorithm where more than one link components are taken into considerations...
One of the most critical problems in multihop wireless networks is the fair allocation of bandwidth among different nodes. Although there are significant researches on the fairness issues in single-hop wireless networks, research on multihop fairness rarely found in the literature. A user in multi-hop network, besides the contention with other nodes to obtain the channel in physical layer, must find...
Almost all deployed implementations of the IEEE802.16 standard (also known as WiMAX) employ the Point to Multipoint (PMP) topology. With such a topology Quality of Service (QoS) can be easily achieved, but the coverage area is limited. The other architectural topology is the Mesh Mode which is able to provide a larger coverage area, but cannot support the QoS required. This paper addresses the issue...
A new cross layer path selection scheme with quality of service (QoS) support along urban areas is proposed. First, we introduce a cross-layer approach where the routing decision takes explicit consideration of the application layer objective function. Second, the queueing based mobility model, spatial traffic distribution and probability of connectivity for sparse and dense Vehicular Ad-Hoc Networks...
Recent developments in the field of transmission line monitoring system have led to a renewed interest in wireless sensor networks, which is characterized by the strong real time, high reliability, adaptability, load balancing and so on. However, the bottleneck problem of network transmission which is likely to occur around the sink node must be taken into account. This paper proposes a new cross-layer...
We consider the problem of optimizing the performance of a network coding router with two stochastic flows. We develop a queueing model which accounts for the fact that coding is not performed when packets are transmitted, but is done by a separate program or hardware which operates independently of the hardware that sends packets out over links. We formulate and solve a constrained optimization problem...
Queue scheduling algorithm achieves the assignment of the network resource through scheduling strategy, the reserved bandwidth and delaytime can be guaranteed, then the router select the next packet waiting for forwarding from one or more queues based on some rules, All input network services can share the output bandwidth according to reserved way, to have corresponding resource, and to meet service...
High-speed routers rely on well-designed packet buffers that support multiple queuing, large capacity and short response times. Some researchers suggested a combined SRAM/DRAM hierarchical buffer architecture to meet these challenges. However, both the SRAM and DRAM need to maintain a large number of dynamic queues which is a real challenge in practice and limits the scalability of these approaches...
In this paper, we extend unicast admission control based on path segment measurement technique to multicast environment. The proposed scheme does not impose any requirements on the network routers other than the ability to prioritize the packets. We develop an edge probing mechanism that measures a segment of the network path instead of measuring the full path. With path segment probing, we show that...
In this paper we present results from an extensive measurement study of various hardware and (virtualized) software routers using several queueing strategies, i.e. First-Come-First-Served and Fair Queueing. In addition to well-known metrics such as packet forwarding performance, per packet processing time, and jitter, we apply network calculus models for performance analysis. This includes the Guaranteed...
To deploy network coding (NC) in the Internet core, one difficulty is the selection of coding routers, which largely relies on the understanding of the queueing behavior of NC. In this paper, we build a queueing model to analyze the performance of NC under a bounded maximum opportunistic delay and try to answer several fundamental questions: under what condition is the system stable? how many packets...
With network coding, two data packets are transformed into one by a simple XOR-operation. The transformed packet is transmitted and each original packet can be retrieved at its destination node through a similar XOR-operation. Network coding is an important research topic as it radically challenges existing networking paradigms. In this paper we provide an analytical study of the impact network coding...
The Airborne Internet is envisioned to be a large scale multihop wireless mesh network of commercial passenger aircraft connected via long range highly directional air-to-air radio links. We propose a localized geographic load sharing technique to mitigate congestion in this network, taking into account the underlying link scheduling constraints with directional antennas. When forwarding packets for...
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