Jani Peltotalo

Peer-to-Peer Streaming Technology Survey

Lately there has been a growing interest in the use of peer-to-peer technologies for deploying large-scale live media streaming systems over the Internet. In this paper we give a brief survey on the peer-to-peer streaming field and have also a closer look on selected applications. In practice, we analyse the selected peer-to-peer streaming systems (Octoshape, SopCast, TVAnts and TVU networks) and see if they are suitable for mobile usage. This paper also shows results from an experimental test carried out by using selected applications with a PC over different network connections (EDGE, UMTS, HSDPA, ADSL and LAN). None of the selected applications are designed to be used in a mobile environment, so there is still a lot of work to do to have optimized systems in the mobile network environment.

A Real-Time Peer-to-Peer Streaming System for Mobile Networking Environment

Peer-to-peer is emerging as a potentially disruptive technology for content distribution in the mobile Internet. In addition to the already well-known peer-to-peer file sharing, real-time peer-to-peer streaming is gaining popularity. This paper presents an effective real-time peer-to-peer streaming system for the mobile environment. The basis for the system is a scalable overlay network which groups peers into clusters according to their proximity using RTT values between peers as a criteria for the cluster selection. The actual media delivery in the system is implemented using the partial RTP stream concept: the original RTP sessions related to a media delivery are split into a number of so-called partial streams according to a pre-defined set of parameters in such a way that it allows low-complexity reassembly of the original media session in real-time at the receiving end. Partial streams also help in utilizing the upload capacity with finer granularity than just per one original stream. This is beneficial in mobile environments where bandwidth can be scarce.

RTSP-based Mobile Peer-to-Peer Streaming System

Peer-to-peer is emerging as a potentially disruptive technology for content distribution in the mobile Internet. In addition to the already well-known peer-to-peer file sharing, real-time peer-to-peer streaming is gaining popularity. This paper presents an effective real-time peer-to-peer streaming system for the mobile environment. The basis for the system is a scalable overlay network which groups peer into clusters according to their proximity using RTT values between peers as a criteria for the cluster selection. The actual media delivery in the system is implemented using the partial RTP stream concept: the original RTP sessions related to a media delivery are split into a number of so-called partial streams according to a predefined set of parameters in such a way that it allows low-complexity reassembly of the original media session in real-time at the receiving end. Partial streams also help in utilizing the upload capacity with finer granularity than just per one original stream. This is beneficial in mobile environments where bandwidth can be scarce.

Reliable, server-friendly and bandwidth-efficient file delivery system using FLUTE server file format

The use of Forward Error Correction (FEC) codes is a classical solution to improve the reliability of multicast and broadcast transmissions in a packet erasure channel. However, FEC encoding on-the-fly increases the load of the server and it may decrease the overall performance of the file delivery system. This paper presents a reliable, server-friendly and bandwidth-efficient file delivery system using the server file format for File Delivery over Unidirectional Transport (FLUTE) protocol. The FLUTE server file format enables storage of pre-composed source symbols and pre-calculated FEC symbols into a media container file, so there is no need to source symbol construction and FEC encoding on-the-fly. Additionally, the actual transmission is controlled by file delivery hint tracks containing cookbook instructions that ease the encapsulation of source and FEC symbols into a transmittable packet stream.

Personal mobile broadcasting based on the 3GPP MBMS system

During the past few years a new trend, user generated content, has gained more and more popularity. Current website-based sharing services provide already means to share content to a group of other users, but it is not possible to share content with other mobile users at a competitive cost. The increasing use of mobile devices in our daily life will create demand for the new types of services in the usergenerated content field. This paper presents a personal mobile broadcasting system as an extension to the currently existing 3GPP MBMS system. A new user-level interface between the BM-SC and the personal mobile broadcaster is proposed. Also some new functionality, to be able to restrict the delivery only to a subset of user population, are presented in the paper.

Scalable packet loss recovery for mobile P2P streaming

In a real-time peer-to-peer streaming system peers in the overlay network may arrive and depart in a very dynamic fashion especially in mobile environment. This manifests itself by a sudden uncontrolled disappearance of a sender and, as a consequence, packets being lost at the receiving side. To ensure seamless media playback the data should not have interruptions. Therefore, if some data packets are missing those should be requested and retrieved from other peers before the playback point reaches the gap in the reception buffer. This paper presents a scalable two-stage packet loss recovery mechanism for a real-time peer-to-peer streaming system using RTCP and RTSP.

Using SIP Extensions for Signalling in Stream Service System

This paper describes some aspects of signalling in an access network independent service control system, which can be used for instance to order stream based personalized services for a number of terminals, wired or wireless, with different capabilities. Functions of the control system include the handling of capability negotiations and service initiation between the client and the media server system. Overview of the system is given and special attention is paid to the use of SIP and SIP extensions with XML content for managing the parameter negotiations. Resource reservation is also made possible to the service control system by making use of the bandwidth broker of the network service provider.