Standardization of network interfaces : a framework for collaborative development and go-to-market strategy

Thesis (S.M.)--Massachusetts Institute of Technology, System Design and Management Program, 2006."June 2006."Includes bibliographical references.Over the last decade technological innovation in computers and communications industries has resulted in higher penetration of technology intensive products in businesses and homes. In communications industry, the true value of converged networks will be exploited only if the products and services provided end-to-end quality, reliability and consistency of features and functionalities that are offered. However, for this to happen, the products, systems and networks need to be interoperable. Interoperability can be accomplished most effectively and efficiently by use of common standards; but at the same time use of common standards potentially and arguably leads to commoditization of products, and constrains ability of product differentiation. Processes for setting standards, are not only messy but are prolonged, and quite often lead to battles for platform leadership. As incumbent telecommunications service providers transition from the public switched telephone networks to the IP-based data networks, customer expectations are high, challenges are many and failures are costly.(cont.) Verizon Interoperability Forum has taken on this challenge by attempting to develop standards for interfaces for network elements that are used on Verizon's own network. It is proposed that network interfaces' standards exhibit characteristics of network effects and possess a great potential for becoming a de facto standard.by Uday Hardikar.S.M

MOBILITY SUPPORT ARCHITECTURES FOR NEXT-GENERATION WIRELESS NETWORKS

With the convergence of the wireless networks and the Internet and the booming demand for multimedia applications, the next-generation (beyond the third generation, or B3G) wireless systems are expected to be all IP-based and provide real-time and non-real-time mobile services anywhere and anytime. Powerful and efficient mobility support is thus the key enabler to fulfil such an attractive vision by supporting various mobility scenarios. This thesis contributes to this interesting while challenging topic. After a literature review on mobility support architectures and protocols, the thesis starts presenting our contributions with a generic multi-layer mobility support framework, which provides a general approach to meet the challenges of handling comprehensive mobility issues. The cross-layer design methodology is introduced to coordinate the protocol layers for optimised system design. Particularly, a flexible and efficient cross-layer signalling scheme is proposed for interlayer interactions. The proposed generic framework is then narrowed down with several fundamental building blocks identified to be focused on as follows. As widely adopted, we assume that the IP-based access networks are organised into administrative domains, which are inter-connected through a global IP-based wired core network. For a mobile user who roams from one domain to another, macro (inter-domain) mobility management should be in place for global location tracking and effective handoff support for both real-time and non-real-lime applications. Mobile IP (MIP) and the Session Initiation Protocol (SIP) are being adopted as the two dominant standard-based macro-mobility architectures, each of which has mobility entities and messages in its own right. The work explores the joint optimisations and interactions of MIP and SIP when utilising the complementary power of both protocols. Two distinctive integrated MIP-SIP architectures are designed and evaluated, compared with their hybrid alternatives and other approaches. The overall analytical and simulation results shown significant performance improvements in terms of cost-efficiency, among other metrics. Subsequently, for the micro (intra-domain) mobility scenario where a mobile user moves across IP subnets within a domain, a micro mobility management architecture is needed to support fast handoffs and constrain signalling messaging loads incurred by intra-domain movements within the domain. The Hierarchical MIPv6 (HMIPv6) and the Fast Handovers for MIPv6 (FMIPv6) protocols are selected to fulfil the design requirements. The work proposes enhancements to these protocols and combines them in an optimised way. resulting in notably improved performances in contrast to a number of alternative approaches

Sustainable Poetry: Four American Ecopoets

Focusing on the work of A.R. Ammons, Wendell Berry, W.S. Merwin, and Gary Snyder, author Leonard Scigaj shows that just as a sustainable society does not depreciate its resource base, so a sustainable poetry does not restrict interest to language. Over the past thirty years many poets have shown an increasing sensitivity to ecological thinking. But critics trained in poststructuralist language theory often fail to explore the substance of ecopoetry. Scigaj is the first to define ecopoetry as separate and distinct from nature or environmental poetry, marked by its concern with balancing the interests of human beings with the needs of nature. Just as science learned that the earth was not the center of the universe, ecopoetry insists on the recognition that humans are not at the center of the natural world. The first book to treat the US’s four foremost ecopoets as ecopoets. -- Choice Scigaj uses his examination of contemporary ecological poetry to mount a direct assault on the way literary theory has been conducted over the past twenty years. -- Interdisciplinary Studies in Literature and Environment Will join John Elder\u27s Imagining the Earth as the most important contribution to date to the study of contemporary ecopoetry. -- Lawrence Buell A rich context for our understading the work and persons of A.R. Ammons, Wendell Berry, W.S. Merwin, and Gary Snyder, four outstanding American poets. -- Psychological Reports Anyone who things that nature poetry is a leftover mode from a bygone era, or that all nature poets are alike, needs to read this book before we have no nature left. -- Virginia Quarterly Review Urges readers to distinguish between two kinds of poetry in order to set the stage for an epic intellectual and aesthetic battle. -- Western American Literaturehttps://uknowledge.uky.edu/upk_english_language_and_literature_north_america/1001/thumbnail.jp