Modeling a new Startup Algorithm for TCP New Reno

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The Effect of Network and Infrastructural Variables on SPDY's Performance

HTTP is a successful Internet technology on top of which a lot of the web resides. However, limitations with its current specification, i.e. HTTP/1.1, have encouraged some to look for the next generation of HTTP. In SPDY, Google has come up with such a proposal that has growing community acceptance, especially after being adopted by the IETF HTTPbis-WG as the basis for HTTP/2.0. SPDY has the potential to greatly improve web experience with little deployment overhead. However, we still lack an understanding of its true potential in different environments. This paper seeks to resolve these issues, offering a comprehensive evaluation of SPDY's performance using extensive experiments. We identify the impact of network characteristics and website infrastructure on SPDY's potential page loading benefits, finding that these factors are decisive for SPDY and its optimal deployment strategy. Through this, we feed into the wider debate regarding HTTP/2.0, exploring the key aspects that impact the performance of this future protocol

Using UNII-3 (Wi-Fi) Frequencies to Establish Long Distance Point-to-Point Links Capable of Providing Broadband Internet Access to Rural Areas: Experimental Validation

This paper demonstrates use of UNII-3 (Wi-Fi) frequencies, 5.725 - 5.825GHz in setting up long distance point-to-point links, capable of providing broadband internet in rural areas. Although this frequency band was intended for indoor wireless local area networks, its lack of licensing and inexpensive off-shelf networking devices has prompted many researchers and technology enthusiasts to extend its use to outdoor settings. This paper presents a long distance point-to-point test-bed model that uses high-gain directional antennas that may be replicated to provide broadband internet access in rural areas particularly in developing countries. Six long-distance point-to-point links have been set up. A link distance of 24.3kilometers, the longest so far, has been achieved. A peak throughput of 98.4Mbps has been observed on all of the links set up, irrespective of their link lengths. This test-bed model is easy and inexpensive to implement and it may be replicated to provide broadband internet access in the rural areas. This paper validates the use of these unlicensed frequencies and proves that as long as a clear line of sight between the nodes is achievable, high bandwidth link may be achieved capable of serving 1000+ simultaneous users each utilizing at least 100kbps. Keywords: Point-to-point links, long distance Wi-Fi, broadband for rural areas, directional antenna

Design and analysis of TCP AIMD in wireless networks

The class of additive-increase/multiplicative-decrease (AIMD) algorithms constitutes a key mechanism for congestion control in modern communication networks, like the current Internet. The algorithmic behaviour may, however, be distorted when wireless links are present. Specifically, spurious window reductions may be triggered due to packet reordering and non-congestive loss. In this paper, we develop a framework for AIMD in TCP to analyze the aforementioned problem. The framework enables a systematic analysis of the existing AIMD-based TCP variants and assists in the design of new TCP variants. It classifies the existing AIMD-based TCP variants into two main streams, known as compensators and differentiators, and develops a generic expression that covers the rate adaptation processes of both approaches. It further identifies a new approach in enhancing the performance of TCP, known as the compensation scheme. A tax-rebate approach is proposed as an approximation of the compensation scheme, and used to enhance the AIMD-based TCP variants to offer unified solutions for effective congestion control, sequencing control, and error control. In traditional wired networks, the new family of TCP variants with the proposed enhancements automatically preserves the same inter-flow fairness and TCP friendliness. We have conducted a series of simulations to examine their performance under various network scenarios. In most scenarios, significant performance gains are attained. © 2013 IEEE.published_or_final_versio

ESTADO DEL ARTE DEL IEEE802.11 PARA LA CONECTIVIDAD DE ZONAS RURALES

RESUMEN ANALITICOEste artículo presenta el estado del arte relacionado con el estándar IEEE802.11 para la conectividad de zonas rurales, obtenido a partir de la revisión de bibliografía y literatura técnica internacional. En primer lugar, se exponen, desde el enfoque de varios autores, los diferentes mecanismos de control de acceso al medio que pueden operar en la capa física establecida dentro del estándar y que permiten el despliegue de redes de largo alcance; posteriormente, se realiza el análisis de cada capa MAC con las principales características de desempeño para el despliegue de redes de áreas extensas. Se describe además el desempeño de la capa física y los límites de distancia posibles para los enlaces de radio considerando la máxima potencia isotrópica radiada equivalente en la banda ISM y el nivel de señal recibida; por último se presentan de manera general los trabajos realizados por algunos de los principales grupos de investigación a nivel internacional relacionados con el tema de desarrollo de redes inalámbricas para emplazamientos rurales en países en desarrollo así como algunas de sus experiencias más importantes. PALABRAS CLAVES: IEEE802.11, Rurales, Control De Acceso Al Medio, Capa Fisica, Red.STATE OF THE ART OF IEEE802.11 FOR RURAL CONNECTIVITY ANALYTICAL SUMMARYThis article presents the state of the art relating to the IEEE802.11 standard for connectivity in rural areas, obtained from a review of international literature and technical literature. First, set out from the focus of several authors and different mechanisms for medium access control that can operate at the physical layer provided within the standard and allow the deployment of long-range networks. Subsequently, the analysis is performed in MAC layer of the main features of performance for the deployment of wide area networks. It also describes the physical layer performance and potential distance limits for radio links considering the maximum equivalent isotropic radiate power in the ISM band and the received signal level. Finally are generally the work of some of the leading research groups on the topic of developing wireless networks for rural locations in developing countries and some of their most important experiences. KEYWORDS: IEEE802.11, Rural, Media Access Control, Physical Layer, Network

ESTADO DEL ARTE DEL IEEE802.11 PARA LA CONECTIVIDAD DE ZONAS RURALES

RESUMEN ANALITICOEste artículo presenta el estado del arte relacionado con el estándar IEEE802.11 para la conectividad de zonas rurales, obtenido a partir de la revisión de bibliografía y literatura técnica internacional. En primer lugar, se exponen, desde el enfoque de varios autores, los diferentes mecanismos de control de acceso al medio que pueden operar en la capa física establecida dentro del estándar y que permiten el despliegue de redes de largo alcance; posteriormente, se realiza el análisis de cada capa MAC con las principales características de desempeño para el despliegue de redes de áreas extensas. Se describe además el desempeño de la capa física y los límites de distancia posibles para los enlaces de radio considerando la máxima potencia isotrópica radiada equivalente en la banda ISM y el nivel de señal recibida; por último se presentan de manera general los trabajos realizados por algunos de los principales grupos de investigación a nivel internacional relacionados con el tema de desarrollo de redes inalámbricas para emplazamientos rurales en países en desarrollo así como algunas de sus experiencias más importantes. PALABRAS CLAVES: IEEE802.11, Rurales, Control De Acceso Al Medio, Capa Fisica, Red.STATE OF THE ART OF IEEE802.11 FOR RURAL CONNECTIVITY ANALYTICAL SUMMARYThis article presents the state of the art relating to the IEEE802.11 standard for connectivity in rural areas, obtained from a review of international literature and technical literature. First, set out from the focus of several authors and different mechanisms for medium access control that can operate at the physical layer provided within the standard and allow the deployment of long-range networks. Subsequently, the analysis is performed in MAC layer of the main features of performance for the deployment of wide area networks. It also describes the physical layer performance and potential distance limits for radio links considering the maximum equivalent isotropic radiate power in the ISM band and the received signal level. Finally are generally the work of some of the leading research groups on the topic of developing wireless networks for rural locations in developing countries and some of their most important experiences. KEYWORDS: IEEE802.11, Rural, Media Access Control, Physical Layer, Network