REAL – TIME MOBILE P2P VIDEO STREAMING OVERLAY

Wathsala VithanageLanka Software Foundation

How P2P Streaming Works

IP – Multicasting [PeerCast]

Distributed Hash Tables [Tribler, DistribuStream]

Problem with IP – Multicasting

Fails when IP – Multicasting is not available on network hardware

Multicasting is not available on mobile broadband connections

Therefore not suitable for mobile devices

Problem with Existing DHT based Systems

Work like bittorrent

Offloads the streaming device [but still there can be more than one recipient connected to the source device]

Recipient will have to relay the stream at least to one node

Therefore not suitable for mobile devices [Bandwidth and CPU power is limited]

Problem with Searching

Searching is either provided as a centralized solution or not provided at all

Centralized systems Torent search engines Centralized indexing systems

Problem?

Existing systems are not suitable for mobile devices

Searching is not distributed [low on availability]

Solution

A System that scales well for mobile devices

A system with a distributed search engine

Built on top of DHTs

Using RTP

Hierarchical Overlay

Overlay is split in to two classes

Super nodes [Resourceful, Stays longer in the network]

Regular nodes [Typical smart phones connected through mobile broadband]

Hierarchical Overlay

Goal

No sharing of bandwidth at regular nodes

Hierarchical Overlay

• Only super nodes can function as bootstrap nodes

• A node which has been elected as a super node should at least have one super node as its immediate neighbour.

Searching

A Tag Overlay

Before streaming distribute tags

Searching

Key Word Results

England S5, S6, S16

ODI S6, S9

Cricket S0, S1, S6, S9

Searching

Unique Streams

Weight

S6 1

S9 0.66

S0 0.33

S1 0.33

S5 0.33

S9 0.33

Streaming

• Route a message towards the stream key

• Establish an RTP stream via the path taken by the message

• Start playing RTP video

Q & A