| 1. |
- Palme, Jacob, et al.
(author)
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Issues when designing filters in messaging systems
- 1996
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In: Computer Communications. - : Elsevier BV. - 0140-3664 .- 1873-703X. ; 19:2, s. 95-101
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Journal article (peer-reviewed)abstract
- The increasing size of messaging communities increases the risk of information overload, especially when group communication tools like mailing lists or asynchronous conferencing systems (like Usenet News) are used. Future messaging systems will require more capable filters to aid users in the selection of what to read. The increasing use of networks by non-computer professionals requires filters that are easier to use and manage than most filtering software today. Filters might use evaluations of messages made by certain users as an aid to filtering these messages for other users.
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| 2. |
- Parnes, Peter, et al.
(author)
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Lightweight application level multicast tunnelling using mTunnel
- 1998
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In: Computer Communications. - 0140-3664 .- 1873-703X. ; 21:15, s. 1295-1301
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Journal article (peer-reviewed)abstract
- This paper presents a system, named mTunnel, for application level tunnelling of IP-multicast traffic in a lightweight manner, where the end-user is responsible for deciding which MBone-sessions and which IP-multicast groups to tunnel. mTunnel is primarily designed for easy deployment and easy-to-manage tunnelling. Information about currently tunnelled sessions and control of mTunnel is provided through a Web-interface. To save bandwidth, tunnelled streams can be transcoded on the media level and traffic sent through the tunnel can be compressed by grouping several packets together and using statistical compression. The overall bandwidth reduction achieved, without modifying the media itself, has been measured to be between 5% and 14%, depending on the traffic and media type.
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| 3. |
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| 4. |
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| 5. |
- Amador Molina, Oscar, 1986-, et al.
(author)
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Evaluation of Greedy and CBF for ETSI non-area GeoNetworking : The impact of DCC
- 2024
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In: Computer Communications. - Amsterdam : Elsevier. - 0140-3664 .- 1873-703X. ; 218, s. 114-130
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Journal article (peer-reviewed)abstract
- This paper evaluates the performance of the two ETSI non-area forwarding algorithms in the GeoNetworking specification: Greedy Forwarding and Non-Area Contention-Based Forwarding (CBF). Non-area forwarding occurs when a packet is sent to a geographical Destination Area from a node located outside of this area, e.g., when a vehicle wants to alert of hazardous events to other vehicles located in a distant geographical area. The evaluation has been carried out both in urban and highway scenarios and takes into account the complete ETSI Architecture, including the interaction with the Decentralized Congestion Control (DCC) mechanism. We have also compared ETSI-defined mechanisms with optimizations found in the literature. Our main findings are that Greedy Forwarding, when combined with DCC, is extremely ineffective even with optimizations, and Non-Area CBFs (both ETSI CBF and an optimized version called S-FoT+) outperform Greedy Forwarding both in highway and urban scenarios.
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| 6. |
- Araujo, Igor, et al.
(author)
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A GPU-assisted NFV framework for intrusion detection system
- 2021
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In: Computer Communications. - : Elsevier BV. - 1873-703X .- 0140-3664. ; 169, s. 92-98
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Journal article (peer-reviewed)abstract
- The network function virtualization (NFV) paradigm advocates the replacement of specific-purpose hardware supporting packet processing by general-purpose ones, reducing costs and bringing more flexibility and agility to the network operation. However, this shift can degrade the network performance due to the non-optimal packet processing capabilities of the general-purpose hardware. Meanwhile, graphics processing units (GPUs) have been deployed in many data centers (DCs) due to their broad use in, e.g., machine learning (ML). These GPUs can be leveraged to accelerate the packet processing capability of virtual network functions (vNFs), but the delay introduced can be an issue for some applications. Our work proposes a framework for packet processing acceleration using GPUs to support vNF execution. We validate the proposed framework with a case study, analyzing the benefits of using GPU to support the execution of an intrusion detection system (IDS) as a vNF and evaluating the traffic intensities where using our framework brings the most benefits. Results show that the throughput of the system increases from 50 Mbps to 1 Gbps by employing our framework while reducing the central process unit (CPU) resource usage by almost 40%. The results indicate that GPUs are a good candidate for accelerating packet processing in vNFs.
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| 7. |
- Badia, Leonardo, et al.
(author)
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An Economic Model For The Radio Resource Management In Multimedia Wireless Systems
- 2004
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In: Computer Communications. - : Elsevier BV. - 0140-3664 .- 1873-703X. ; 27:11, s. 1056-1064
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Journal article (peer-reviewed)abstract
- In this paper, we study the connection between radio resource management (RRM) and economic parameters, whose application in multimedia communication system is a challenging task. In fact, a real network provider has to consider other parameters, besides the common goals of RRM like throughput maximisation or meeting constraints connected with the quality of service. In particular, when the financial needs of the provider and the reaction of the users to prices are taken into account, economics have to be introduced in the analysis. We intend to study multimedia communication systems by including well-known economic models and reasonable considerations in the usual radio resource allocation scenario. To do this, we present a model of users' satisfaction, which considers the effects of both users' request and price paid. In this way, it is possible to investigate the relationship between the radio resource allocation and the provider revenue. Other conclusions can be derived as well, e.g. for the pricing strategy planning or the network dimensioning. Thus, we give analytical insight and numerical results, which highlight that the network management is heavily affected by the economic scenario.
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| 8. |
- Bagula, Antoine B
(author)
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Hybrid routing in next generation IP networks
- 2006
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In: Computer Communications. - : Elsevier BV. - 0140-3664 .- 1873-703X. ; 29:7, s. 879-892
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Journal article (peer-reviewed)abstract
- This paper presents a hybrid approach for routing flows in IP networks to achieve an optimal network configuration maximising bandwidth usage (optimality), minimising re-routing upon failure (reliability) and reducing the signalling overheads resulting from a full IP tunnelling (scalability). We formulate the routing of flows in IP networks as a service differentiated model where the IP flows are classified into high bandwidth demanding (LBD) and low bandwidth demanding (LBD) flows at the ingress of the network and handled differently into the core using a hybrid IGP+MPLS approach where the LBD flows are routed over the existing IGP paths while the HBD flows are carried over MPLS bandwidth-guaranteed tunnels. This model can be deployed in heterogenous network environments where HBD flows carrying real-time traffic and LBD flows transporting best-effort traffic are handled differently over a common transport network implementing traffic prioritization in response to natural or man-made emergencies. We consider the routing of flows within an IP domain's boundaries and evaluate the efficiency of the new routing approach under uniform and bursty traffic profiles. We apply the routing approach to compute paths for the traffic offered to a 20- and 50-node test networks. Simulation reveals that the hybrid routing approach outperforms both IGP and MPLS routing under the network conditions and test network models considered.
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| 9. |
- Bellalta, Boris, et al.
(author)
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Next generation IEEE 802.11 Wireless Local Area Networks : Current status, future directions and open challenges
- 2016
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In: Computer Communications. - : Elsevier. - 0140-3664 .- 1873-703X. ; 75, s. 1-25
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Journal article (peer-reviewed)abstract
- A new generation of Wireless Local Area Networks (WLANs) will make its appearance in the market in the forthcoming years based on the amendments to the IEEE 802.11 standards that have recently been approved or are under development. Examples of the most expected ones are IEEE 802.11aa (Robust Audio Video Transport Streaming), IEEE 802.11ac (Very-high throughput at < 6 GHz), IEEE 802.11af (TV White Spaces) and IEEE 802.11ah (Machine-to-Machine communications) specifications. The aim of this survey is to provide a comprehensive overview of these novel technical features and the related open technical challenges that will drive the future WLAN evolution. In contrast to other IEEE 802.11 surveys, this is a use case oriented study. Specifically, we first describe the three key scenarios in which next-generation WLANs will have to operate. We then review the most relevant amendments for each of these use cases focusing on the additional functionalities and the new technologies they include, such as multi-user MIMO techniques, groupcast communications, dynamic channel bonding, spectrum databases and channel sensing, enhanced power saving mechanisms and efficient small data transmissions. We also discuss the related work to highlight the key issues that must still be addressed. Finally, we review emerging trends that can influence the design of future WLANs, with special focus on software-defined MACs and the internet-working with cellular systems.
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