Mobility management for multimedia services in heterogeneous environments

2012 ◽  
Vol 8 (3) ◽  
pp. 266
Author(s):  
Elena Apostol ◽  
Valentin Cristea
Author(s):  
Truong Cong Thang ◽  
Yong Man Ro

Content adaptation currently appears to be the key solution to support the quality of service (QoS) for multimedia services over heterogeneous environments. In this chapter, we study modality conversion as an important adaptation method. We point out two main challenging issues of the problem of modality conversion: (1) the quantification of the content value (quality) when contents are drastically scaled and/or converted to other modalities and (2) the method to accurately decide the modality and content value for each object given that quantification. Accordingly, we will present in detail the solutions as well as the open questions to these two issues. Moreover, we discuss the benefits and obstacles as well as future trends of modality conversion in realizing the goal of universal multimedia access.


Author(s):  
Jianfeng Guan ◽  
Changqiao Xu ◽  
Hongke Zhang ◽  
Huachun Zhou

The organization of this chapter is as follows: It begins by analyzing the mobility challenges under the multi-accessing wireless heterogeneous environments. Next the chapter gives a brief introduction of the mobility management. Afterwards it introduces the state-of-art of the mobility management solutions and describes the respective approaches and compares their advantages and disadvantages. The last section concludes this chapter.


Author(s):  
Nuno Coutinho ◽  
Susana Sargento

Heterogeneity is seen as the prevailing feature in Next Generation Networks, requiring the development of novel solutions to overcome the challenges posed by future communication environments. Thus, the major goal is to transform the diversity into an opportunity to increase user experience, which can be achieved through context-awareness. Considering this, and given the increasing demand for group-based multimedia services, this chapter focuses on providing an effective multimedia group communication in heterogeneous environments, developing an architecture driven by the available context information. It introduces a hierarchical architecture that employs the concept of abstract trees to control multiparty content distribution in a scalable way, being the trees built based on intelligent network selection schemes fed by available context information. The chapter’s ultimate goal is to find the best compromise between service personalization and resources optimization, developing an architecture flexible enough to properly react to context changes.


Author(s):  
Ulrike Lucke

Applications and infrastructures of the future will have to be intelligent to some extent, which means that they should automatically adapt to the current situation and intention of the user. This regards basic interoperability issues in heterogeneous environments as well as advanced behavior of software. Two technological trends contribute to solve this problem: service-orientation and context-awareness. We present a system architecture and realization that makes use of these trends. Its scope is education in general, or the interconnection of face-to-face and online learning in particular. The focus of this article is to explain the technical architecture behind these applications. Its validity is demonstrated with the help of selected use cases.


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