Internet Access Networks Research Articles

IPTV Software Process and Workflow

Abstract Internet Protocol Television (IPTV) is a recent and still evolving technology. It is used to deliver TV service through IP (Internet Protocol). It is a system, through which Internet television services are delivered using the architecture and networking methods of the Internet Protocol suite over a packet-switched network infrastructure. Example the Internet and broadband Internet access network instead of being delivered through traditional radio frequency broadcast, satellite signal and Cable Television (CATV) formats. It is a secure and reliable delivery to subscribers of entertainment audio, video and other related services. This may include the Live TV, Video on Demand (VoD) and Interactive TV. These services are delivered across packet switched network that employs the Internet protocol to transport the audio, video and control signals by uniquely identifying the IP address of all other components on the Internet. In contrast to video over the public Internet, with Internet Protocol Television deployment network security and performance are tightly managed to ensure a superior entertainment experience and resulting in a compelling business environment for content providers, customers and advertisers alike. The approach of this effort is to first develop IPTV software process, quality and IPTV SDK Website portal. In this paper new modules have been written to cover all the configuration, functionality, interoperability and integration. Many tools & technology were used to understand the Functional specification of IPTV in detail and understand the work flow to plan and write the module. The developed module will be integrated into the existing OLCS and will be made live so that every user throughout the globe can access it with ease.

Life Cycle Assessment of ICT

SummaryThe use of information and communication technology (ICT) is growing throughout society, and new products and solutions are developed at an increasing rate. To enable environmental assessment of specific ICT products and other products that rely on ICT in some way, a more complete, detailed, and up‐to‐date study based on real measurements is needed. To date, similar studies have not been readily available or fully comprehensive. This study assessed the overall operational electricity use and life‐cycle–based carbon footprint (CF) relating to ICT in Sweden, including activities not commonly addressed previously, such as shared data transport networks and data centers and manufacturing of network infrastructure. Specific, detailed inventory data are presented and used for assessment of the Internet Protocol core network, data transmission, operator activities, and access network. These specific data, in combination with secondary, more generic data for end‐user equipment, allow a comprehensive overall assessment. The majority of the ICT network CF is the result of end‐user equipment, mainly personal computers, followed by third‐party enterprise networks and data centers and then access networks. The parts closest to the user proved to be clearly responsible for the majority of the impact. The results are presented for Swedish ICT networks and for ICT networks in general based on a global average electricity mix.

Countering isolation with the use of technology: how asylum-seeking detainees on islands in the Indian Ocean use social media to transcend their confinement

Governments detain asylum seekers on islands across the Indian Ocean region, including Australia's Christmas Island, Papua New Guinea's Manus Island, Nauru, and across the Indonesian archipelago. Scholars and advocates alike have shown that the ambiguous jurisdiction and complex legal migration statuses that emerge in these areas, as well as their remote location and isolation, contribute to their popularity as sites of migrant detention. The negative effects of isolation and remoteness on migrants' physical and mental health, as well as their legal outcomes, have been well documented. We argue, however, that detainees and others are countering the effects of isolation with the use of technology. Ethnographic research conducted on the islands within Australian and Indonesian migrant detention networks suggests that asylum seekers detained in remote sites across the region are combating the isolation of detention with the use of mobile phones, internet access, and social media networks. They communicate with friends, relatives, legal representatives, advocates, activists, and members of the public beyond prison walls to transmit information, facilitate advocacy inside and outside of detention facilities, and construct transnational support networks. In turn, punitive policies to discipline asylum seekers by limiting methods of communication threaten these efforts.

An extended active access-point selection algorithm for link speed changes in wireless mesh networks

As an inexpensive, scalable internet-access network, a wireless internet-access mesh network ( WIMNET ) is composed of multiple access-points ( APs ) connected by wireless links. WIMNET can improve the dependability to link or AP failures by allocating APs redundantly in the network field. Because redundant APs may increase the operational cost and degrade the performance due to increasing radio interferences, only the necessary APs for communications between the hosts and the internet gateway should be activated in conventional situations. Previously, we proposed an active AP selection algorithm to select the minimum number of APs to be activated such that the overall throughput is maximised, assuming that every link has the same constant speed. However, our preliminary experiments for the emerging high-speed IEEE802.11n protocol that should be introduced into WIMNET, found that this speed is greatly affected by the link environment such as the distance. In this paper, we present an extension of the active AP selection algorithm to efficiently select active APs under link speed changes. Besides, we extend the routing tree algorithm used in the algorithm procedure and the WIMNET simulator for throughput evaluations. We verify the effectiveness through extensive simulations in three instances.

The tyranny of distance prevails: HTTP protocol latency and returns to fast fibre internet access network deployment in remote economies

Public policies to deploy enhanced local broadband access infrastructure in locations physically very far removed from the firms and customers with whom they transact are frequently justified by claims of increased competitiveness arising from the elimination of the ‘tyrannies of distance’. Yet relative distance-based disadvantages remain in respect of time-dependent applications and those hosted on distant infrastructures or requiring data sourced from distant locations. Trading off the effects of faster local access and latency on the time taken to load a Web page based on the HTTP Web protocol, we demonstrate that the increasing returns to distance rapidly overcome the effect of faster local access bandwidth as the distance the data must travel increases. We conclude that claims that investment in ultra-fast local broadband access will unconditionally facilitate a step-change in national economic performance are without foundation. In the absence of some compelling underlying competitive advantages, the ‘transformational’ economic benefits will be local rather than international in nature. At best, government investment in nationwide fast fibre networks is a defensive strategy that enables ongoing participation in the international economy, but at relatively higher costs than those faced by larger economies in closer proximity to end markets.

A Fixed Backoff-Time Switching Method for CSMA/CA Protocol in Wireless Mesh Networks

SUMMARY As a flexible and cost-efficient scalable Internet access network, we studied architectures, protocols, and design optimizations of the Wireless Internet-access Mesh NETwork (WIMNET) .W IMNET is composed of multiple access points (APs) connected through multihop wireless communications on IEEE 802.11 standards. The increasing popularity of real-time applications such as IP-phones and IP-TV means that they should be supported in WIMNET. However, the contention resolution mechanism using a random backoff-time in the CSMA/CA protocol of 802.11 standards is not sufficient for handling real-time traffic in multihop wireless communications. In this paper, we propose a Fixed Backoff-time Switching (FBS) method for the CSMA/CA protocol to improve the real-time traffi cp erformance in WIMNET by giving the necessary activation chances to each link. We implement our proposal on the QualNet simulator, and verify its effectiveness through simulations on three network topologies with four scenarios.

차세대 이동통신 네트워크를 위한 무선 액세스 망 구조 및 가상화 시나리오

차세대 모바일 인터넷의 진화에 따라 2G, 3G, 4G, B4G 이동통신 무선접속네트워크가 공존하게 되며, 기존의 통신 서비스 제공자들은 통합 서비스 제공자로 융합되고, 다수의 가상 서비스 제공자들이 발생하게 될 것으로 예상된다. 이러한 복잡한 미래의 융합 서비스를 제공하기 위해서 미래 인터넷에서는 무선 액세스 네트워크가 융합되고 다양한 서비스 제공자들에 의해 공유되는 무선 네트워크 가상화가 필수적이다. 따라서 본 논문에서는 미래 무선 액세스 네트워크 상에서 여러 서비스 제공자들의 다양한 무선 액세스 기술들이 유연하게 통합 운영될 수 있는 무선 액세스 네트워크 가상화를 위한 망 구조와 가상화 시나리오에 대해서 고찰한다. 본 논문에서 도출된 차세대 이동통신 네트워크를 위한 무선 액세스 망 구조 및 가상화 시나리오는 앞으로 무선 액세스 네트워크 가상화 알고리즘 개발을 위한 기틀 역할을 할 수 있을 것으로 기대된다. In accordance with evolution of next-generation mobile Internet, 2G, 3G, 4G, and B4G mobile communication wireless access networks will be co-existed and service providers will be merged as an integrated service provider. In addition, multiple virtual service operators will appear. In order to provide complicated unified-services, in the future Internet, wireless network virtualization where network resource is shared by various service operators is necessary. Therefore, in this paper, we investigate network architectures and virtualization scenarios for wireless access network virtualization where various wireless access technologies are flexibly operated by multiple service providers over next-generation wireless access networks. We expect that the virtualization scenario and network architecture yielded from this study can play a role as a basis for development of wireless access network virtualization algorithms.

Improving the Security of Protected Wireless Internet Access from Insider Attacks

Although some of public wireless Internet access (Wi-Fi) networks are protected by encryption mechanisms such as WEP and WPA, connected hosts are still unnecessarily visible and accessible. Because there is no need to use shared resources in these networks, internal adversaries can misuse IP visibility in shared media. In this paper, some of the common internal targeted attacks towards these networks are studied. In addition, the security of protected public wireless networks is improved by putting each host in a dedicated VLAN, assigning random IP configurations to each, and filtering out all inter-communications packets. The experimental results show that invisible hosts were protected against inside targeted attacks.

Quality of Experience Management for YouTube: Clouds, FoG and the AquareYoum

Article Quality of Experience Management for YouTube: Clouds, FoG and the AquareYoum was published on August 1, 2012 in the journal PIK - Praxis der Informationsverarbeitung und Kommunikation (volume 35, issue 3).

AN ACTIVE ACCESS-POINT SELECTION APPROACH FOR DEPENDABLE WIRELESS MESH NETWORKS

As an inexpensive, flexible, and scalable Internet-access wireless network, we have studied the architecture, protocols, and design optimizations of the Wireless Internet-access Mesh NETwork (WIMNET) that adopts multiple access-points (APs) connected through wireless links. WIMNET can improve the dependability to failures of APs and/or their links by allocating APs redundantly in the network field. Because redundant APs may increase the operational cost and degrade the throughput due to increasing radio interferences, only the necessary APs for connectivity between the hosts and the Internet gateway should be activated in communications. In this paper, we first define the active AP selection problem of selecting the minimum number of active APs, and prove the NP-completeness of its decision version through reduction from the known minimum set cover problem. Then, we propose an active AP selection algorithm of deactivating APs one by one until no more AP can be deactivated. Due to the limited transmission capacity in WIMNET, we further present an algorithm extension for throughput maximization. We verify the effectiveness of our proposal through simulations in three instances, where the number of active APs is reduced by more than 40% and the throughput is improved by more than 10% from the original in any instance.

WiFi와 mobile WiMax간 핸드오버 방안

현재 무선 인터넷 접속 서비스는 3G 이동 통신 네트워크, mobile WiMAX, WiFi 등을 통해 언제 어디서든 이루어지고 있다. 다양한 무선 네트워크가 혼재해 있는 환경에서 사용자는 상황에 따라 네트워크를 선택할 수 있어야 하며 또한 동종 또는 이기종 네트워크간 이동성 지원도 필요로 하고 있다. 이러한 이유로, 서비스 지역이 가장 넓은 3G 네트워크를 주축으로 3G-mobile WiMAX(IEEE 802.16e)와 3G-WiFi(IEEE 802.11)에 대한 연동 방안들이 많이 연구되어 왔다. 그러나 최근 넷북, 전자책, 스마트폰 등의 등장과 함께 무선 인터넷 사용이 늘면서 mobile WiMAX와 WiFi 서비스 지역이 급속히 증가하고 있으며 특히 인터넷 전화 서비스와 같은 실시간 애플리케이션 사용이 가능해 짐에 따라 전통적인 음성 서비스를 하는 3G 이동 통신 네트워크의 비중은 점차 줄고 무선 인터넷 접속네트워크인 mobile WiMAX나 WiFi는 그 비중이 점차 커지고 있다. 따라서 본 논문에서는 mobile WiMAX와 WiFi간 이동성 지원과 핸드오버 지연을 최소화 하는 PMIPv6(Proxy Mobile IPv6) 기반의 핸드오버 방안을 제안한다. 제안한 방안에서 이동 노드(MN)는 WiFi와 mobile WiMAX 두 개의 인터페이스를 갖는 이중 스택 구조이며 WiFi가 이동성 지원을 하지 않으므로 기존 동종 네트워크간 핸드오버시 게이트웨이간 핸드오버 시그널링을 처리하는 기능을 이동 노드에 두도록 제안하고 있다. 동종 네트워크간 핸드오버와 비교해 제안된 핸드오버 방안은 해석적 평가를 통해 핸드오버 지연 및 전송 지연과 시그널링 오버헤드가 감소함을 보여준다. At present wireless internet access service is available through the 3G network, mobile WiMAX and WiFi anytime and anywhere. In this environment where there are various networks, users should be able to select specific networks depending on different situations. And it is necessary to provide mobility support between homogeneous and between heterogenous networks. Given this situation, the many proposals have been presented to link 3G, which has the largest service area among various networks, with mobile WiMAX(IEEE 802.16e), or with WiFi(IEEE 802.11). But, recently, with the increasing volume of wireless internet use and wireless internet data, due to the advents of net-book, e-book and smart phone, the service area of WiFi and mobile WiMAX has rapidly expanded. Especially, the availability of real-time application such as internet phone has led to the relative shrinking of the proportion of 3G mobile communication network giving conventional voice service, and enlargement of those of wireless internet access networks like WiFi and mobile WiMAX. This paper suggests a handover scheme based on PMIPv6, whitch support mobility between WiFi and mobile WiMAX, and minimizes handover delay. In this scheme, the mobile node has a dual stack structure composed of two interfaces-WiFi and mobile WiMAX. Since WiFi dose not support mobility, it is suggested that the mobile node have the capacity to deal with handover signaling between gateway in case of handover between homogeneous networks. This handover scheme, suggested comparing with current handovers between homogeneous networks, has proved, in its analytic evaluation, to be able to reduce handover, transmission, and signaling overhead.

State of Art Techniques in En-Route Caching

The World Wide Web has been considered as a large distributed information system based development and use of computer technology that both provide access to shared data objects. En-Cache techniques are important for reducing Internet access latency, network traffic, and server load in different networks. In this paper, we survey the state-of-art techniques used in En-route Caching and discuss the recent development.

Extensions of the Access Point Allocation Algorithm for Wireless Mesh Networks

Previously, we have proposed an access point (AP) allocation algorithm in indoor environments for the Wireless Internet-access Mesh NETwork (WIMNET) using one gateway (GW) to the Internet. WIMNET consists of multiple APs that are connected wirelessly mainly by the Wireless Distribution System (WDS), to expand the coverage area inexpensively and flexibly. In this paper, we present two extensions of this algorithm to enhance the applicability to the large-scale WIMNET. One is the multiple GW extension of the algorithm to increase the communication bandwidth with multiple GWs, where all the rooms in the network field are first partitioned into a set of disjoint GW clusters and then, our previous allocation algorithm is applied to each GW cluster sequentially. The APs in a GW cluster share the same GW. The other is the dependability extension to assure the network function by maintaining the connectivity and the host coverage, even if one link/AP fault occurs, where redundant APs are added to the AP allocation by our previous algorithm. The effectiveness of our proposal in terms of the number of APs and the throughput is verified through simulations using the WIMNET simulator.

A Proxy-Based System For Dynamic Content Negotiation And Collaborative Optimization In Heterogenic Environments

Abstract Ubiquitous and Pervasive Computing relies on ubiquitous network access and applications’ context-awareness. This pervasive access implies exchanging traffic with a wide spectrum of devices across heterogenic networks. Services and applications deployed on these networks should adapt its operation and presentation to the characteristics of the underlying network technologies and the actual client device capabilities. Cellulaz wide azea networks like UMTS are used as Internet access networks for particular users but, in some cases, they can also be employed to provide Internet access to other smaller networks. The main inconvenient is that cellular networks have not the same bandwidth as wired networks and therefore, the cellular channel becomes a network bottle-neck. To help to mitigate this situation and in order to improve the user’s experience different optimization techniques exist, especially in web traffic. This paper studies the existing synergies at HTTP layer between device capabilities e...

Cognitive networking of large scale wireless systems

We propose the concept of cognitive networking for large-scale wireless systems, which opportunistically utilises network resources including both spectrum bandwidth and radio availability. Both types of resources cannot be predetermined in large-scale wireless systems, due to various reasons such as interferences and dynamic traffic load. The proposed technology not only establishes dynamic wireless networks, but also provides for reliable network quality of services (QoS). The supporting network architecture, embedded wireless interconnect (EWI), is proposed to implement the cognitive networking concept and supply an effective application-programming interface for large-scale data management systems. Two example applications are presented, including wireless mesh networks for broadband wireless internet access and wireless sensor networks for target tracking. Major advantages of the technology are further discussed. We suggest that the performance of the proposed system would improve with larger network scale and the implementation complexity could be independent of the network scale.

An Access Point Allocation Algorithm for Indoor Environments in Wireless Mesh Networks

As a flexible, cost effective solution for a large-scale access network to the Internet, we have studied the design optimization of the Wireless Internet-access Mesh NETwork (WIMNET). WIMNET consists of multiple access points (APs) that have wireless links between them mainly on the wireless distribution system (WDS). In WIMNET, the links around the Internet gateway can be bottlenecks because every packet passes through it after multihop link activations. Besides, the link quality may be degraded by obstacles in indoor environments. Thus, the proper allocation of APs is essential in WIMNET, so that the communication quality should be ensured while the installation and management cost be minimized. In this paper, we formulate this AP allocation problem for indoor environments in WIMNET with the proof of the NP-completeness of its decision version. Then, we present its two-stage heuristic algorithm composed of the initial greedy allocation and the iterative improvement. The effectiveness of our proposal is verified through extensive simulations in three indoor environments.

WIFI PUBLICS

Drawing on community expertise, open-source software and non-hierarchical organizational strategies, community wireless networks (CWN) engage volunteers in building networks for public internet access and community media. Volunteers intend these networks to be used to reinvigorate local community. Together the following two purposes create two distinct mediated publics: to engage volunteers in discussing and undertaking technical innovations, and to provide internet access and local community media to urban citizens. To better address the potential of CWN as a form of local innovation and democratic rationalization, the relationship between the two publics must be better understood. Using a case study of a Canadian CWN, this article advances the category of ‘public’ as alternative and complementary to ‘community’ as it is used to describe the social and technical structures of these projects. By addressing the tensions between the geek-public of WiFi developers, and the community-public of local people using community WiFi networks, this article revisits questions about the democratic impact of community networking projects. The article concludes that CWN projects create new potential for local community engagement, but that they also have a tendency to reinforce geek-publics more than community-publics, challenging the assumption that community networks using technology development as a vector for social action necessarily promote greater democracy.

Hardware and software solutions for wireless mesh network testbeds

Wireless mesh networks are currently emerging as a promising technology for broadband ubiquitous networking. Typical applications range from home broadband Internet access and community networking to wireless metropolitan area networks. Many companies are currently active in this field with proprietary solutions mostly based on the IEEE 802.11 family of standards. At the same time, there are considerable efforts in academia aiming to provide real-world prototypes and testbeds based on open source software and off-the-shelf technologies. This article provides a survey on the most relevant hardware and software platforms that can be used to build a WMN testbed.

Admission Control Based on Rate-Variance Envelop for VBR Traffic Over IEEE 802.11e HCCA WLANs

With the increasing popularity of using wireless local area networks (WLANs) for Internet access, the controlled channel access mechanism in IEEE 802.11e WLANs, i.e., HCF controlled channel access (HCCA), has received much more attention since its inherent centralized mechanism is more efficient in handling time-bounded multimedia traffic. So far, only a few research studies address the admission control problem of variable bit rate (VBR) traffic over HCCA. These existing studies consider each traffic flow individually and, thus, cannot exploit the statistical multiplexing gain among multiple VBR traffic flows. In this paper, we apply the existing statistical multiplexing framework to the studied admission control problem, with all the features of IEEE 802.11e HCCA being taken into consideration. Experimental results show that our proposed admission control scheme achieves significant improvement in network utilization while still satisfying all the quality-of-service (QoS) requirements.

IPTV over P2P streaming networks: the mesh-pull approach

IPTV, an emerging Internet application, would revolutionize the entertainment and media industries; however, IPTV also has the potential to overwhelm the Internet backbone and access networks with traffic. To date, IPTV over P2P streaming networks has advanced significantly using two different approaches: tree-push versus mesh-pull. In particular, the mesh-pull streaming approach has achieved a number of successful commercial deployments. In this article, we examine the current progress in the research and development of mesh-pull P2P streaming systems. We provide an overview of the general mesh-pull streaming architecture and review various challenges, design issues, and interesting research problems in this approach. We discuss the construction costs for providing an IPTV service with service guarantees. We outline a measurement technique for monitoring the video playback quality of mesh-pull streaming systems. We emphasize that the future P2P IPTV systems should be designed to meet the expectations of users for quality-of-experience. We also identify a few other important issues for IPTV over P2P streaming networks, including the traffic pressure on ISPs, various security concerns, and the necessity to re-examine the most appropriate P2P architecture. Insights obtained in this study will be valuable for the development and deployment of future P2P IPTV systems.