Reed-Solomon Forward Error Correction (FEC) Schemes Status of This Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.
SUMMARYThis paper presents the results of performance tests carried out for a file delivery system based on the file delivery over unidirectional transport (FLUTE) protocol. FLUTE is a file transport protocol used to deliver files over IP networks, including the Internet and unidirectional systems, from a sender to one or more receivers. FLUTE uses UDP, an unreliable transport protocol, and so reliable delivery must be guaranteed by other means. This paper shows how FLUTE manages to recover from packet losses using forward path redundancy (forward error correction (FEC) and repeat transmissions in a data carousel), and a simple HTTP-based point-to-point file repair scheme which is specified in 3GPP and DVB standards. The results presented in this paper show that careful optimization of FEC overhead, and the number of repeat transmissions, gives the best system performance in most cases. Based on the simplified error reception and distribution model depicted in this study, it is illustrated that the simple client-server pointto-point file repair is optimal only for small groups. Several options to improve the configuration of FLUTE senders are provided, to deliver reception guarantees with optimal data expense from the system point of view.
This paper shows the architecture and discusses about the implementation of an access network independent service control system that can be used to order stream-based services for terminals with different capabilities. A control system is implemented to handle the parameter negotiation and service initiation between the client and the server system. The stream-based service is adapted to different access networks via the control system's parameter negotiation procedure. The stream application may also dynamically change service parameters like bandwidth. In addition, the control system allows us to separate the service control entity from the entities involved in the service contents (e.g. user can order a media stream with his GSM phone to hi "future" TV).
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