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Routing and Wavelength Assignment (RWA) is the most concern in wavelength routed optical networks. This paper proposes a novel dynamic RWA scheme inspired by the idea of binary quadratic programming (BQP) formulation for the static RWA problem. Subsequently, a heuristic algorithm namely QP routing and wavelength assignment (QP-RWA) is proposed. In this method, links wavelength occupancy information...
We study joint routing, scheduling, and physical network coding (PNC) in fixed wireless multihop networks under a physical interference model. The objective is to quantify the throughput gain provided by PNC in wireless mesh networks. We formulate a cross-layer optimization framework to determine the optimal max-min throughput of the flows and the optimal configuration of the routing and scheduling...
We propose a combined length-infix pipelined search (CLIPS) architecture for high-performance IP lookup on FPGA. By performing binary search in prefix length, CLIPS can find the longest prefix match in (log L-c) phases, where L is the IP address length (32 for IPv4) and c>;0 is a small design constant (c=2 in our prototype design). Each CLIPS phase matches one or more input infixes of the same...
Next generation of wireless broadband network such as WiMAX MMR networks and LTE Advanced support high quality multimedia services with high data transmission rate. Most of the current broadband operates at high frequency and thus has limited transmission range. Multi-hop relaying technology is seen as an efficient solution that could enhance coverage and improves system capacity. However, overall...
In this paper, we present a low-complexity decoder architecture for WiMAX low-density parity-check (LDPC) codes based on a unified task processor. Memory access is accomplished through routing networks with fixed interconnections and memory address generators, which are quite simple due to the quasi-cyclic structure of the LDPC codes. In order to increase the decoding throughput, the check-node and...
The rationale of this work is that the incumbent primary user (PU) of a cognitive radio (CR) system relays its traffic through the secondary user (SU) network for an enhanced throughput. In return, it rewards the SUs with an incentive time during which they can use the complete licensed bandwidth to transmit their own data, without the need for spectrum sensing. With the objective of maximizing the...
With the growing speed of computer networks, the core routers have to increase performance of longest prefix match (LPM) operation on IP address. While existing LPM algorithms are able to achieve high throughput for IPv4 addresses, the IPv6 processing speed is limited. In this paper we propose a new Hast-Tree Bitmap algorithm for fast longest prefix match for both IPv4 and IPv6 networks. The algorithm...
Applying data-centric and cognitive techniques in the space communications infrastructure promises, by managing and even exploiting complexity, to enhance performance and operational efficiency and to enable future science and exploration operational concepts that require flexible and adaptive communications and networking not currently available.1 2 The paper presents a novel approach to decomposing...
Low Extra Delay Background Transport (LEDBAT) congestion control algorithm is designed to address the unfairness problem of TCP aggravated by applications that use multiple TCP connections for data transfer. LEDBAT operates under the assumption that the queue delay at the access router of the bottleneck link will be the primary varying contributor to end-to-end one-way delay. However this assumption...
Nowadays, multi-field packet classification is one of the most important technologies to support various services in next generation routers. In this paper, we propose a segment tree based parallel SRAM-based pipelined architecture called Set Pruning Segment Trees (SPST) for multi-dimensional packet classification. For solving the memory blowup problem, a grouping scheme called Partition by Length...
In mobile ad hoc networks, the status of the network changes over time due to the movement of terminals, the battery level of terminals, and so on. To construct assurance networks, it is necessary to consider requirements such as dependability, security, and adaptability against changes in the network. We had proposed a routing method, which is referred to as RSR (Route-Split Routing) for mobile ad...
Multiple-Input Multiple-Output (MIMO) communications have shown great promise in providing high spectral efficiency for wireless ad hoc networks. In this paper we study the problem of joint routing, scheduling, power control and bit rate selection in MIMO-based ad hoc network with the goal of maximizing the system throughput that satisfies a given end-to-end traffic demand. We formulate this cross-layer...
TCP does not perform well in networks with stochastic channels, with links that randomly drop packets or have long outages. Diversity routing has been proposed to improve TCP's performance in these networks. In diversity routing, a sublayer between TCP and the network replicates each transmitted packet and sends the multiple copies along parallel paths. As long as at least one of the copies reaches...
We define composite networks when nodes communicate only with their long-range social contacts and there is no direct link between a node and its long-range contact. Each node has a single long-range contact and all nodes within its transmission range are local contacts for the node. The long-range contact is the destination for each node in the network and since there is no direct link from source...
Network Coding is a new field that aims at, notably increasing the throughput in a network. ROCX [1] is an algorithm that makes routing with the awareness of network coding. However, its major limitation is that it does not take into account the bandwidth limitation and the interference impact. If the interference is not considered in a wireless network, a flow requiring a certain bandwidth might...
Traditional multicast routing algorithms such as shortest path tree (SPT) and Steiner tree (MST) do not consider the wireless broadcast advantage or the underlying channel assignments in a multi-channel multi-radio (MCMR) wireless mesh network (WMN). We propose multicast routing algorithms that take into account the above factors in order to minimize the amount of network bandwidth consumed by a routing...
Due to the significant growth of link speeds, amount of data that should be stored on router line cards are rapidly increasing. Therefore, a large number of memory modules are required for packet storage. In addition, a high performance interconnection network on line cards is strongly needed for inter-communication between processing elements and memory modules. In this paper we propose a new interconnection...
In this paper, we propose a simple network coded cooperation using non-binary modulation such as ternary phase shift keying (TPSK), which achieves high power and bandwidth efficiency compared with binary phase shift keying (BPSK). We investigate the encoder design based on serially concatenated convolutional codes (SCCC) and a simple network coding. Also, we study the appropriate decoders to exploit...
A Network-on-Chip (NoC) is a new paradigm in complex System-on-Chip (SoC) designs that provides efficient on-chip communication architecture. It offers scalable communication to SoC and allows decoupling of communication and computation. In NoC, design space exploration is critical due to trade-offs among latency, area, and power consumption. Hence, analytical modeling is an important step for early...
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...
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