An architecture for QoS-enabled video telephony in a 3GPP 4G evolved packet core environment

The mobility management architecture in current generation LTE networks results in high signaling traffic. In this chapter, we present an Evolved Packet Core (EPC) architecture based on Software Defined Networking (SDN) concepts. The proposed EPC architecture centralizes the control plane functionality of the EPC thereby eliminating the use of mobility management protocols and reducing mobility related signaling overheads. The architecture utilizes the global network knowledge with SDN for mobility management. The proposed architecture has been implemented in the ns-3 simulator. A prototype testbed has also been implemented using the Floodlight SDN controller, a Software Defined Radio platform and relevant software.

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Impact of soft handover and pilot pollution on video telephony in a commercial network

2010 16th Asia-Pacific Conference on Communications (APCC) ◽

10.1109/apcc.2010.5679998 ◽

2010 ◽

Cited By ~ 2

Author(s):

Lu Chen ◽

Kumbesan Sandrasegaran ◽

Riyaj Basukala ◽

Faisal Mohd. Madani ◽

Cheng-Chung. Lin

Keyword(s):

Video Telephony ◽

Soft Handover ◽

Pilot Pollution ◽

Commercial Network

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How Late Can you Update? Detecting Blur and Transients in Gaze-Contingent Multi-Resolutional Displays

Proceedings of the Human Factors and Ergonomics Society Annual Meeting ◽

10.1177/154193120504901705 ◽

2005 ◽

Vol 49 (17) ◽

pp. 1527-1530 ◽

Cited By ~ 2

Author(s):

Lester C. Loschky ◽

George W. McConkie

Keyword(s):

Virtual Reality ◽

Eye Movement ◽

Good News ◽

Image Degradation ◽

Transmission Bandwidth ◽

Video Telephony ◽

Processing Resources ◽

Single User

This study investigated perceptual disruptions in gaze-contingent multi-resolutional displays (GCMRDs) due to delays in updating the image after an eye movement. GCMRDs can be used to save processing resources and transmission bandwidth in many single-user display applications such as virtual reality, simulators, video-telephony, remote piloting, and teleoperation. The current study found that image update delays after an eye movement could be as long as 60 ms without significantly increasing the detectability of image degradation and/or transients due to the update. This is good news for designers of GCMRD applications, since it is ample time to update their displays after an eye movement without disrupting perception.

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