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This paper focuses on geostationary satellite scenarios and investigates the performance of several Transmission Control Protocol (TCP) variants in a novel Performance Enhancing Proxy (PEP) architecture solution, whose added value is the use of network coding beneath the transport layer. Comparison of TCP New-Reno, Vegas, Scalable, CUBIC, Hybla, and HTCP and the cases where these transport protocols...
Nowadays networking is secure because we encrypt the confidential messages with the underlying assumption that adversaries in the network are computationally bounded. For traditional routing or network coding, routers know the contents of the packets they receive. Networking is not secure any more if there are eavesdroppers with infinite computational power at routers. Our concern is whether we can...
In this paper, we propose and characterize the performance of a novel video-aware Opportunistic Routing (OR) algorithm for multicast, using a one-hop and two-hop forwarding scheme in 802.11 mesh networks. We believe that the OR approach exploits the inherent broadcast nature of the wireless medium and adapts very well in the lossy wireless environment. Inferring from the above, we extend a state of...
In cognitive radio networks (CRNs), secondary users (SUs) may employ network coding to pursue higher throughput. However, because SUs should not interfere with high-priority primary users (PUs), the available transmission time of SUs is usually uncertain, i.e., SUs do not know how long the idle state can last. Meanwhile, existing network coding strategies generally adopt a block-based transmission...
Device-to-device (D2D) communication underlaying a cellular network is a promising technology in the future wireless networks to improve network capacity and user experience. In current works, D2D communications are considered as two user equipments (UEs) communicating directly without going through the central base station (BS). In fact, D2D communications can be further broadened to multi-hop D2D...
In this paper, we investigate the performance of the so-called Cross Network operating under diverse Network Coding (NC) techniques. We study the impact of Medium Access Control (MAC) layer fairness on the throughput performance of the network for the cases of pure relaying, digital NC with and without overhearing and physical layer NC with and without overhearing. We provide a comparison among these...
Network coding techniques are usually applied upon network layer protocols to improve throughput in wireless networks. However, the packet scheduling algorithm has long been neglected. With proper scheduling, bottleneck nodes can clear their packet queue faster than a vanilla round-robin scheduling algorithm. Therefore, a higher Coding+MAC gain can be achieved. In this paper, we formulate the scheduling...
This paper proposes an iterative decoding algorithm for network coding HARQ (NC-HARQ) retransmission scheme in LDPC system. Including two erroneous codewords and one retransmitted network coded word, a larger Tanner graph is applied in the decoding algorithm. We modify the process of iterative decoding and separate the external information into two parts which come from channel coding and network...
This paper considers a multi-way relay network in which multiple users intend to achieve full information exchange with one another with the aid of a single relay. A general method for designing the transmission protocol with binary physical- layer network coding (PNC) is developed based on a tree representation. Different transmission schemes are analytically and numerically examined in terms of...
This work proposes a solution to overcome the inherent degradation of TCP performance in multi- hop wireless networks. Based on a Network Coding entity integrated between the TCP and the IP layer, we propose a mechanism to encapsulate TCP acknowledgments, which are transmitted along with other segments, thus reducing the number of frames to be sent. We assess the performance of the combination of...
In this paper, PNCR, a routing framework based on Physical Network Coding is proposed. PNCR enables shared utilization of the channel during the broadcast and multiple access phases of transmissions. These additional transmission opportunities can be observed as performance gains in terms of less packet delays and better network throughput. In this paper, we discuss the details of our proposed framework...
We address survivability considerations for telecommunication networks where a part of the network may fail. We focus on single arc failures in multicast networks, with or without network coding. The problem is to compute a routing such that, if any single arc failure occurs, the remaining throughput is as large as possible. In the case of multicast routing without network coding, two ways for computing...
Network coding encourages the mixing of information flows at intermediate nodes of a network for enhanced network capacity, especially for one-to-many multicast applications. A fundamental problem in multicast network coding is to construct a feasible solution such that encoding and decoding are performed over a finite field of size as small as possible. Coding operations over very small finite fields...
Network coding has been shown to be an effective approach to improve the wireless system performance. However, many security issues impede its wide deployment in practice. Besides the well-studied pollution attacks, there is another severe threat, that of wormhole attacks, which undermines the performance gain of network coding. Since the underlying characteristics of network coding systems are distinctly...
Concurrent Multipath Transfer (CMT), enabled by Stream Control Transmission Protocol (SCTP), is considered as one preferred data-transport mode due to increased available bandwidth. However, CMT performance degrades seriously in terms of data reordering due to path dissimilarity and frequent packet loss from wireless unreliability. Most relevant solutions follow the packet sequence numbers and thereby...
In this work, we present an implementation of a two-way decode-and-forward relaying scheme using network coding (NC) in Software-Defined Radio (SDR). We describe a specific medium access (MAC) protocol based on a TDMA scheme to establish robust synchronization between the terminals implemented within the open-source GNU Software Radio (GNU Radio) platform and fitted for operation with an Ettus Universal...
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...
In this work, we explore the performance of back-pressure routing and scheduling for TCP flows over wireless networks. TCP and backpressure are not compatible due to a mismatch between the congestion control mechanism of TCP and the queue size based routing and scheduling of the back-pressure framework. We propose a TCP-aware backpressure routing and scheduling that takes into account the behavior...
The problem of minimizing the number of coding nodes is caused by network coding overhead and is proved to be NP-hard. To resolve this issue, this paper proposes Centrality-based Network Coding Node Selection (CNCNS) that is the heuristic and distributed mechanism to minimize the number of network coding (NC) nodes without compromising the achievable network throughput. CNCNS iteratively analyses...
This paper consists of two main parts. In the first part, our aim is to introduce the reader to the fundamental issue of throughput-delay tradeoff in network coding for wireless communication systems. We discuss important classes of wireless network coding in the literature and identify their advantages and disadvantages in terms of throughput and delay. We also briefly present practical design considerations...
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