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Online ISSN 2047-4962 Print ISSN 2047-4954

IET Networks

Volume 1, Issue 1, March 2012

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Volume 1, Issue 1

March 2012

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Editorial: Inaugural Issue

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    • Design and evaluation of deep packet inspection system: a case study
      • Author(s): M.-Y. Liao ; M.-Y. Luo ; C.-S. Yang ; C.-H. Chen ; P.-C. Wu ; Y.-W. Chen
      • Source: IET Networks, Volume 1, Issue 1, p. 2 –9
      • DOI:  10.1049/iet-net.2011.0048
      • Type: Article
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      • p. 2 –9 (8)
        An increasing number of Internet applications and services render network management more troublesome for bandwidth misuse and security concern. As a result, network traffic identification plays an increasingly important role in network management. Deep packet inspection (DPI) is one of the effective approaches. Conventional network devices lookup the header of a packet, but DPI means the network device is required to match a pattern in the payload of a packet. This study proposes a DPI system and WMT (Wu-Manber with trie) algorithm to classify popular network services; The Net-DPIS is developed based on Netfilter framework in Linux kernel. The authors show how to rearrange the rule policies to increase the performance of Net-DPIS. In the results, the authors show that WMT algorithm is faster than WM algorithm; Net-DPIS has higher average accuracy and performance than L7-filter.
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      Performance comparison of media access control protocols for vehicular ad hoc networks
      • Author(s): M.J. Booysen ; S. Zeadally ; G.-J. van Rooyen
      • Source: IET Networks, Volume 1, Issue 1, p. 10 –19
      • DOI:  10.1049/iet-net.2011.0044
      • Type: Article
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      • p. 10 –19 (10)
        The emergence of computationally rich vehicles and recent advances in wireless communication technologies are fuelling vehicular network research in industry and academia. A key challenge to the successful deployment of vehicular communication is the implementation and efficiency of the medium access control (MAC) layer. There are mainly two types of MAC approaches, namely contention based and contention free. The current standard, IEEE 802.11p, is a contention-based approach, which has the severe limitation of unbounded transmission delays. An alternative contention-free approach called dedicated multi-channel MAC (DMMAC) has been proposed in the literature. In this work the authors analyse these two approaches, discuss their limitations and introduce an improved approach called medium access with memory bifurcation and administration (MAMBA). The authors evaluate the performance of the three approaches in highway and urban scenarios, for both low- and high-density traffic. The authors' performance evaluation results show that MAMBA improves throughput and message delivery ratio by up to 150 and 205% over IEEE 802.11p and DMMAC approaches, respectively. MAMBA also improves on the latency achieved by the other methods by up to 72 and 99% respectively, compared to IEEE 802.11p and DMMAC.
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      Spectrum-aware routing in discontinuous orthogonal frequency division multiplexing-based cognitive radio ad hoc networks
      • Author(s): Y.-S. Chen  and  S.-H. Liao
      • Source: IET Networks, Volume 1, Issue 1, p. 20 –33
      • DOI:  10.1049/iet-net.2011.0002
      • Type: Article
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      • p. 20 –33 (14)
        With the rapid requirement and development of the green ICT (Information and Communication Technology) technology, the demand for dynamically radio spectrum resources has significant attention. The low utilisation of licensed spectrum leads to the scarcity of the spectrum resource. The emerging cognitive radio (CR) systems become increasingly important in the wireless green communication. In cognitive radio ad hoc networks, unlicensed users (called secondary users, SUs) communicate with other CR users through an ad hoc connection on licensed spectrum bands, but spectrum bands may be unexpectedly preempted by licensed users (called primary users, PUs). The design of routing protocol for CR ad hoc network considers problems of the dynamic spectrum sensing, management, sharing and mobility caused by reappearance of PUs. In this paper, the authors developed a spectrum-aware routing protocol for discontinuous orthogonal frequency division multiplexing-based cognitive ad-hoc networks by using the concept of the minimum expected total transmission time. With the expected total transmission time of all possible paths, a route with the smallest expected total transmission time is constructed. Mathematical analysis and simulation result illustrate that the proposed routing protocol can significantly reduce the total transmission time and improve the throughput.
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      Flow-driven media access control protocols over mobile long-distance ad hoc networks
      • Author(s): H. Wang ; C. Chen ; L. Cui ; S. Tan ; V.C.M. Leung
      • Source: IET Networks, Volume 1, Issue 1, p. 34 –45
      • DOI:  10.1049/iet-net.2011.0007
      • Type: Article
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      • p. 34 –45 (12)
        In this paper, we propose two flow driven medium access control (MAC) protocols for mobile long distance ad hoc networks, which are suitable for applications in emergency rescue and battlefield communications. The first one is called flow driven MAC (FD-MAC). It is a slot based MAC protocol that combines random and reservation based access scheme. For short-duration data flows, it employs a random access scheme, while for long-duration data flows it employs a flow driven reservation based access scheme. Furthermore, in order to improve the performance of the protocol in networks with short packets, we propose FD-MAC with packet concatenation and packet header compression (CCFD-MAC) protocol. The theoretical boundaries of the flow classification thresholds (FCTs) of both protocols are deduced, and the optimal values of FCTs are obtained. Simulation results show that FD-MAC significantly improves performance in terms of throughput compared with MACA and Slotted ALOHA protocols, and also performs better than IEEE 802.11 in terms of throughput and latency under medium and high traffic loads. In addition, compared with FD-MAC, CCFD-MAC can achieve a further 30% gain in overall throughput, with J slight increments (no more than 80 ms) in latency under high traffic load environment.
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