Transcript Peer to peer Straightforward Protocol - IITK

Peer to peer
Straightforward Protocol
Sourav Anand
Indian institute of Technology, Kanpur
About the Paper
Authors:
Cristóbal Medina-López, Juan Pablo García-Ortiz, J.A.M Naranjo, L.G. Casado,
Vicente González-Ruiz
Published at The Fourth W3C Web and TV Workshop. Munich, Germany, 2014
Introduction

P2PSP (Peer to Peer Straightforward Protocol) is a communication protocol
of the application layer for streaming multimedia content on the Internet,
that is, where users play the stream in sync. This can be used to build a
variety of live broadcasting services ranging from small meetings to large
systems IPTV . Unlike traditional CS ( Client-Server ) and CDN ( Content
Delivery Network ) based video streaming, P2P contributes its upstream
bandwidth to the system. Therefore, in general, P2P systems are more
scalable architectures based on the model client-server .This protocol helps
in reducing the bandwidth usage of the source of the broadcast by using the
upload bandwidth of the peers connected to the source.

P2PSP has been specially defined for streaming live footage. Thus, it can be
transmitted through a communications network based on packet switching an
event that is occurring at that time, in the same way you can already created
or recorded events.
Introduction

A typical real-time streaming scenario using the C/S mode:
Introduction

An equivalent scenario to the exhibit in previous slide but using the P2PSP:
Architecture

P2PSP is a hybrid structure of Mesh Network in which every peer is connected
to each other and Star Network where there are some sources and every peer
is connected to one of the server directly. A pure P2PSP overlay lies in one
extreme where there is just one server and every peer is connected to each
other. One part of the media is sent to each of the peer which in turn sends
that part to all other peers connected in the network. The other extreme is
where a large group of P2PSP teams are connected to each other in a star
structure which results in requirement of more upload bandwidth from the
source since the same packet will be transmitted more than one time from
single/multiple source(s) of broadcast.
Key Features

Independent of broadcast content, bit-rate, format, resolution etc.

Can be used for broadcasting content in local area network.

Peers can be hosted in private networks, even if they are behind NATs.

The basic module is very simple, which allows it to be run on less powerful
systems.