THESIS
2016
xiv, 122 pages : illustrations ; 30 cm
Abstract
With advances in networking, storage and processing capabilities, mobile devices can now
share videos with each other. In this thesis,we study how to achieve efficient live streaming
among cooperative wireless devices. In such a mobile peer-to-peer (P2P) streaming network,
mobile stations (MSs) relay their received packets in a multi-hop manner by means
of broadcasting using a secondary channel (such as Wi-Fi or Bluetooth). Such network
greatly increases network scalability by multiplying its available bandwidth, extends its
coverage and improves its recovery efficiency.
The design of the broadcast overlay is crucial to streaming efficiency in terms of achievable
streaming rate. We hence first propose a novel overlay called LocalTree which seeks to
minimize the total netwo...[
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With advances in networking, storage and processing capabilities, mobile devices can now
share videos with each other. In this thesis,we study how to achieve efficient live streaming
among cooperative wireless devices. In such a mobile peer-to-peer (P2P) streaming network,
mobile stations (MSs) relay their received packets in a multi-hop manner by means
of broadcasting using a secondary channel (such as Wi-Fi or Bluetooth). Such network
greatly increases network scalability by multiplying its available bandwidth, extends its
coverage and improves its recovery efficiency.
The design of the broadcast overlay is crucial to streaming efficiency in terms of achievable
streaming rate. We hence first propose a novel overlay called LocalTree which seeks to
minimize the total network traffic while covering all the clients. LocalTree takes advantage
of stable clusters of MSs to construct streaming overlay. It combines the strengths of both
structured and unstructured overlay designs, and is simple and effective.
We next investigate live free viewpoint video (FVV) streaming in a wireless cooperative multihop network. An FVV is composed of a large number of camera-captured anchor
views, with virtual views (not captured by any camera) rendered from their nearby anchors
using techniques such as depth-image-based rendering (DIBR). Given limited wireless
bandwidth at the MSs, we seek to maximize the received video quality (i.e., minimize
distortion). We propose a distributed algorithm called PAFV (Peer-Assisted Freeview
Video), which achieves scalability and high video quality.
Packet loss is inevitable in wireless video streaming due to dynamic channel condition.
To address this, we finally study P2P cooperative error recovery for video broadcasting.
In our system, an MS may generate some parity packets and share them to its neighbors.
An important problem is to minimize the total number of parity packets generated while
achieving a certain residual loss rate. We propose BOPPER (Broadcast-based P2P Error
Recovery), a novel and fully distributed algorithm to achieve low residual loss.
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