Abstract
Abstract 3rd Generation Partnership Project specified Application Layer - Forward Error Correction (AL-FEC) to be used for Enhanced Multimedia Broadcast Multicast Services (E-MBMS) in Long Term Evolution (LTE) networks. Specifically, Raptor coding is applied to both streaming and file delivery services. This article focuses on streaming services and investigates the optimum configuration of the AL-FEC mechanism depending on the signal-to-interference plus noise power ratio conditions. These configurations are compared with a scenario without an application layer protection to obtain the potential gain that can be achieved by means of AL-FEC. This article also studies the multiplexing of services within the AL-FEC time interleaving. These analyses were performed using a proprietary system level simulator and assuming both pedestrian and vehicular users. Different quality criterions were used to ensure the completeness of the study. Results show the significant benefit of using AL-FEC in E-MBMS in terms of coverage and service quality.
Highlights
Universal mobile telecommunications systems (UMTS) integrated in March 2005—Release 6—Multimedia Broadcast Multicast Services (MBMS) as a technical feature to provide an efficient delivery mode of mass multimedia services such as mobile TV [1]
This article has presented some guidelines for the efficient transmission of Enhanced Multimedia Broadcast Multicast Services (E-MBMS) services proposing the utilization of Application Layer - Forward Error Correction (AL-forward error correction (FEC)) protection based on Raptor codes for the transmission of streaming services over Long Term Evolution (LTE) networks
Several AL-FEC configurations with different protection periods and code rates have been compared with the transmission of streaming services without AL-FEC protection
Summary
Universal mobile telecommunications systems (UMTS) integrated in March 2005—Release 6—Multimedia Broadcast Multicast Services (MBMS) as a technical feature to provide an efficient delivery mode of mass multimedia services such as mobile TV [1]. This can result in high loss rates for users with poor channel conditions [2] To overcome these problems and increase the robustness of the p-t-m transmissions, MBMS introduced an additional forward error correction (FEC) mechanism at the application layer (AL-FEC) based on Raptor codes for both streaming and file delivery services [3]. Concerning the application of AL-FEC protection for broadcast and multicast services over wireless mobile networks, this topic has extensively been studied in 3rd Generation (3G) including file delivery [11,12,13] and streaming services [13,14] These works analyzed the system trade-offs between AL-FEC and PHY-FEC for MBMS and concluded that only a well-designed system that combines both coders can maximize efficiency and user perception. It is important to note that among the 10 subframes included
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