'Retransmissions' diaporamas de présentation

Wireless TCP Introduction

Wireless TCP Introduction. The problems of Standard TCP over wireless link and basic solution Several implementations of wireless TCP I-TCP (Indirect TCP) Snoop Protocol Delayed duplicated ACK Multiple Acknowledgements Freeze TCP Comments and discussion.

807 views • 79 slides

Reliable Transport and Code Distribution in Wireless Sensor Networks

Reliable Transport and Code Distribution in Wireless Sensor Networks. Thanos Stathopoulos CS 213 Winter 04. Reliability: Introduction. Not an issue on wired networks TCP does a good job Link error rates are usually ~ 10 -15 No energy cost However, WSNs have: Low power radios

770 views • 66 slides

A Tutorial on SIP

A Tutorial on SIP. Jonathan Rosenberg Chief Scientist. Developed in mmusic group in IETF Proposed standard RFC2543, Feb. 1999 Work began 1995 Part of Internet Multimedia Conferencing Suite Main functions Invitation of users to sessions

787 views • 64 slides

Epidemics

Epidemics. Spring 2008: CS525 Farhana Ashraf and Fariba Khan. Problem: Multicast. Simultaneously deliver information to a group of destinations. Examples: News groups Update for replicated database systems Real-time media ( i.e. Sports) Conference bridge

640 views • 54 slides

Computer Networks An Introduction

Computer Networks An Introduction. Prepared by S.Perry (February 2010). To present a comprehensive view of the principles and fundamental concepts in Computer Networks To learn about the basics in design and implementation of network protocols

660 views • 43 slides

Multihop Over the Air Programming

Multihop Over the Air Programming. Thanos Stathopoulos LECS Lab, UCLA. Introduction. Nature of sensor networks Expected to operate for long periods of time Human intervention impractical or detrimental to sensing process Nevertheless, code needs to be updated Add new functionality

520 views • 36 slides

Using redundancy to enable interactive connectivity for moving vehicles

Using redundancy to enable interactive connectivity for moving vehicles. Ratul Mahajan Microsoft Research Collaborators: Aruna Balasubramanian, Jitu Padhye, Sharad Agarwal, Abhinav Jain, Brian Levine, Arun Venkataramani, John Zahorjan, Brian Zill.

441 views • 33 slides

WiFi, Bluetooth & Layers

700 views • 32 slides

Packet service in UMTS: delay-throughput performance of the downlink shared channel

Packet service in UMTS: delay-throughput performance of the downlink shared channel. Flaminio Borgonovo, Antonio Capone, Matteo Cesana, Luigi Fratta. 1. Introduction. In the last ten years: IP applications has pushed the data traffic to grow quickly

461 views • 31 slides

CSEE W4140 Networking Laboratory

417 views • 24 slides

The Layers of a Network and Error Correction

The Layers of a Network and Error Correction. Wade Trappe. Lecture Overview. Layers Components The 7 Layers of OSI Their Purpose Error Correcting Codes Definitions Some Basic Results Major Math will be presented on the board. Layering.

468 views • 23 slides

Limited Transmit for TCP

Limited Transmit for TCP. Paul Amer CISC 856 - TCP/IP & Upper Layer Protocols May 17, 2011. references: RFC 3042 Hari Balakrishnan's PhD Thesis. Motivation: World Wide Web. Empirical data shows that more than half of all objects downloaded from the Web are small (e.g., < 10KB)

437 views • 23 slides

Simulation of Adaptive Bit Loading for Wireless Network Channels

Simulation of Adaptive Bit Loading for Wireless Network Channels. By: Nithin Dinker Kamath. Introduction. Why to use Adaptive Bit Loading? Wireless channels are inherently heterogeneous Signal Fading and Distortion Due to Atmospheric Condition Inter Symbol Interference (ISI)

424 views • 22 slides

Voice over IP

Voice over IP. Why Challenges/solutions Voice codec and packet delay. Motivation: Benefits: Reduce backbone network costs: managing a single packet backbone instead of multiple backbones (packet switching for IP and circuit switching for voice). No way for TDM networks to support IP traffic

397 views • 11 slides

381 views • 10 slides