spaper16_slides - MULTIPLE TREE VIDEO MULTICAST OVER...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Wei Wei and Avideh Zakhor Presented By, Sneha Borra - 81415985 Sravani Boggaram - 39997921 MULTIPLE TREE VIDEO MULTICAST OVER WIRELESS AD HOC NETWORKS
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
INTRODUCTION Multiple tree construction schemes Routing protocols for video streaming over wireless ad hoc networks. The main idea is to split the video into multiple parts and send each part over a disjoint tree so that increases robustness.
Background image of page 2
Two new multiple tree multicast protocols SCHEME 1 constructs two disjoint multicast trees in a serial but distributed fashion, and is called as serial multiple disjoint tree multicast routing protocol. SCHEME 2 is called parallel multiple nearly disjoint multicast trees protocol which achieves reasonable tree connectivity. Simulations show that video quality for both schemes is higher than that of single tree multicast.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Applications Currently video applications are expected to become available on wireless ad hoc networks due to the increase in the bandwidth of wireless channels and also the computational power of mobile devices. Examples include video conferencing at a location without wireless infrastructure, search and rescue operations after a disaster, transmitting video on the battlefield. Interactive video applications are delay and loss sensitive. Hence late arriving video packets are useless to the decoder.
Background image of page 4
CHALLENGES FOR SUPPORTING VIDEO COMMUNICATION The topology of ad hoc networks may change frequently. Limited battery life of mobile devices. Lower wireless network capacity compared to wired networks. Higher random packet loss due to multiple wireless links. Delay and loss sensitive nature of interactive video communication.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
MULTIPLE DESCRIPTION CODING(MDC) Natural technique for multiple tree video multicast communication. Feedback techniques are not applicable. Basic idea Generates multiple compressed descriptions of the media such that a reasonable reconstruction is achieved if any one of the multiple description is available for decoding. Reconstruction quality is improved as more descriptions become available.
Background image of page 6
MDC (continued) Advantage No specific one description is needed in order to render the remaining descriptions. Disadvantage Penalty in coding efficiency and bit rate. Multicasting MDC Used in peer-to-peer networks to prevent web servers from being overwhelmed by large number of requests.
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
EXISTING TECHNIQUES On-demand multicast routing protocol(ODMRP) Single tree multicast protocol. Builds multicast mesh by periodically flooding the network with control packets. Creates and maintains the forwarding state of each node, when the source has packets to send. Takes advantage of the broadcast nature by forwarding group flooding
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/30/2011 for the course CIS 6930 taught by Professor Staff during the Fall '08 term at University of Florida.

Page1 / 43

spaper16_slides - MULTIPLE TREE VIDEO MULTICAST OVER...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online