Scalable and adaptive context delivery mechanism for context-aware computing

نویسندگان

  • Lenin Mehedy
  • Sungyoung Lee
  • Salahuddin Muhammad Salim Zabir
  • Young-Koo Lee
چکیده

— Presence of innumerable sensors, complex deduction of contexts from sensor data, and reusability of contextual information impose the requirement of middleware for contextaware computing. Smart applications, hosted in myriad devices (e.g PDA, mobile, PCs), acquire different contexts from the middleware and act intelligently based on the available contexts in a context-aware computing environment. Therefore we believe, as the system grows larger in near future, scalable delivery of contexts from the middleware to numerous contextaware applications will be inevitable. But, pure unicast or pure broadcast based dissemination can not provide scalability as well as less average latency. Hence, in this paper we present a scalable context delivery mechanism for these middleware to facilitate the development of larger context-aware computing systems. Proposed scheme is based on hybrid data dissemination technique where the most requested data (e.g. HOT contexts) are multicast and the rest (e.g. COLD contexts) are delivered through unicast to reduce network traf c. We dynamically prioritize and classify the HOT and COLD context data depending on the number of requests and longest waiting time. Moreover, the division of bandwidth between the delivery of HOT and COLD contexts reduces average latency and we also decrease polling traf c by incorporating leasing mechanism. Extensive simulation proves the proposed scheme to perform better. We also present implementation detail of our prototype that is developed using the available tools such as Jini framework and Java Reliable Multicast Service (JRMS) library. Index Terms— Context delivery, Context aware Middleware, Hybrid data dissemination, Bandwidth Division, Scalable Delivery

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

A semantic-aware role-based access control model for pervasive computing environments

Access control in open and dynamic Pervasive Computing Environments (PCEs) is a very complex mechanism and encompasses various new requirements. In fact, in such environments, context information should be used in access control decision process; however, it is not applicable to gather all context information completely and accurately all the time. Thus, a suitable access control model for PCEs...

متن کامل

Hybrid Dissemination Based Scalable and Adaptive Context Delivery for Ubiquitous Computing

Context delivery is an inevitable issue for ubiquitous computing. Context-aware middlewares perform all the functions of context sensing, inferring and delivery to context-aware applications. But one of the major issues for these middlewares is to devise a context delivery scheme that is scalable as well as efficient. Pure unicast or pure broadcast based dissemination can not provide scalabilit...

متن کامل

CAMAC: a context-aware mandatory access control model

Mandatory access control models have traditionally been employed as a robust security mechanism in multilevel security environments such as military domains. In traditional mandatory models, the security classes associated with entities are context-insensitive. However, context-sensitivity of security classes and flexibility of access control mechanisms may be required especially in pervasive c...

متن کامل

A context-sensitive dynamic role-based access control model for pervasive computing environments

Resources and services are accessible in pervasive computing environments from anywhere and at any time. Also, due to ever-changing nature of such environments, the identity of users is unknown. However, users must be able to access the required resources based on their contexts. These and other similar complexities necessitate dynamic and context-aware access control models for such environmen...

متن کامل

Designing Tools for Context-aware Adaptive Mobile Learning

During the past years, ubiquitous computing has influenced Technology-enhanced Learning. This is widely known as ubiquitous learning. On the other hand, the widespread ownership of mobile devices has lead to an increased interest to ubiquitous learning that is supported by mobile devices. This is commonly referred to as mobile learning. An important success factor for ubiquitous and mobile lear...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:
  • Int. J. Pervasive Computing and Communications

دوره 4  شماره 

صفحات  -

تاریخ انتشار 2008