Ubi-Flex-Cloud: ubiquitous flexible cloud computing: status quo and research imperatives

Akhilesh S. Thyagaturu, Giang Nguyen, Bhaskar Prasad Rimal, Martin Reisslein

Research output: Contribution to journalReview articlepeer-review

2 Scopus citations


Purpose: Cloud computing originated in central data centers that are connected to the backbone of the Internet. The network transport to and from a distant data center incurs long latencies that hinder modern low-latency applications. In order to flexibly support the computing demands of users, cloud computing is evolving toward a continuum of cloud computing resources that are distributed between the end users and a distant data center. The purpose of this review paper is to concisely summarize the state-of-the-art in the evolving cloud computing field and to outline research imperatives. Design/methodology/approach: The authors identify two main dimensions (or axes) of development of cloud computing: the trend toward flexibility of scaling computing resources, which the authors denote as Flex-Cloud, and the trend toward ubiquitous cloud computing, which the authors denote as Ubi-Cloud. Along these two axes of Flex-Cloud and Ubi-Cloud, the authors review the existing research and development and identify pressing open problems. Findings: The authors find that extensive research and development efforts have addressed some Ubi-Cloud and Flex-Cloud challenges resulting in exciting advances to date. However, a wide array of research challenges remains open, thus providing a fertile field for future research and development. Originality/value: This review paper is the first to define the concept of the Ubi-Flex-Cloud as the two-dimensional research and design space for cloud computing research and development. The Ubi-Flex-Cloud concept can serve as a foundation and reference framework for planning and positioning future cloud computing research and development efforts.

Original languageEnglish (US)
JournalApplied Computing and Informatics
StateAccepted/In press - 2022


  • Cloud computing
  • Flexibility
  • Low-latency
  • Mobility
  • OpenStack
  • Scalability
  • Ubiquity

ASJC Scopus subject areas

  • Software
  • Information Systems
  • Computer Science Applications


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