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Abstract Existing terminal oriented handover mechanisms capable of meeting the strict delay bounds of real time
 

Summary: Abstract ­ Existing terminal oriented handover mechanisms
capable of meeting the strict delay bounds of real time
applications such as VoIP do not consider the QoS of candidate
handover networks. In this paper ECHO ­ a QoS based
handover solution for VoIP­ is proposed. ECHO is endpoint
centric and does not require any network support; it leverages
the SCTP transport protocol. ECHO incorporates network
metrics that directly affect VoIP quality into the handover
decision process. A dynamic variant of the ITU-T E-Model is
used to calculate how the network metrics map to a user
perceived voice quality metric known as the MOS. The MOS
value is then used to make handover decisions between each of
the available access networks. The results show that the addition
of the QoS capabilities significantly improves the handover
decisions that are made.
I. INTRODUCTION
An increasing variety of options for wireless network
access, coupled with increased capabilities of mobile end-
terminals provide users with the possibility of seamlessly
accessing the network via different radio access technologies.

  

Source: Atiquzzaman, Mohammed - School of Computer Science, University of Oklahoma

 

Collections: Computer Technologies and Information Sciences