Enhancing multimedia streaming over existing wireless LAN technology using the Unified Link Layer API

Abstract

SUMMARYThis paper examines how multimedia streaming scenarios can be enhanced by cross-layer interaction, and in particular link performance information and configuration options provided by the recently developed Unified Link Layer API (ULLA). It provides results of an experimental implementation developed for this purpose in a wireless LAN (WLAN) environment. Multimedia streaming is an application that is gaining in popularity for mobile devices and in particular mobile Internet-based content broadcasting is rapidly emerging as a key feature on mobile devices. In these scenarios, the wireless link (last hop) is normally the performance bottleneck due to the dynamic and limited capacity of the wireless medium. The use of ULLA in this context can provide the ability to tailor the video transmission to the wireless link performance and also to configure the links in response to performance problems or environmental changes. For this purpose the focus of multimedia streaming has been on WLAN link technology and dynamic adaptation (i.e., dynamic channel selection and video transcoding) using a dynamic resource reservation overlay protocol.

Improving UDP performance using intermediate QoD‐aware hop system for wired/wireless multimedia communication systems

“…This block is reachable under the following condition: Arrival_counter < Num_of_packets and flag=0. Hence the following condition should be implemented in block (6):…”

“…One good approach was to combine the well-known techniques of dynamic resource selection and dynamic content adaptation to resolve inherent problems of multimedia streaming regarding congestion and interference over wireless networks [6]. This was based on the use of a unified link layer API not only to tailor video transmission with respect to the wireless link performance, but also to configure the links to react to environmental changes or performance obstacles [6]. Another method on multimedia streaming over wireless networks incorporated an unequal error protection (UEP) coding technique with multimedia applications for better utilization of channel resources [7].…”

Adaptive cognitive media delivery over composite wireless networks

“…In order to provide a combined dissatisfaction level for all users we take each d u and weight it with the corresponding user privilege level W u before summation to arrive at a combined overall dissatisfaction (D), for all users, as defined in (2). The privilege level is a way to take into account that some users may be more important and should have a lower dissatisfaction level than other users.…”

“…This is a particular problem associated with adaptive CoD delivery, which continuously adapts itself to the observed performance, especially when there are several radio resource options available that can dynamically be selected. Previous research in the field of cognitive radio (CR) resource management has considered opportunistic resource sharing (such as within [1][2][3][4]). However, application of these techniques to adaptive OTT CoD media delivery introduces different problems related to the adaptive nature of the application traffic and associated fairness considerations, outlined in [5], which will interact with the dynamic channel state estimation and modelling approach.…”

New video discarding policies for improving UDP performance over wired/wireless networks

“…RELATED WORK There are many research ideas proposed to improve multimedia streaming over wireless networks, which can be classified based on the hosting layer. For example, in the application layer, many schemes were proposed [31][32][33][34]. Detailedly, Burza et al [31] proposed a method that delays the transmission of I-frames received by overwhelmed buffers.…”