Real-time traffic support in heterogeneous mobile networks

Abstract

Multi-hop mobile wireless networks have been proposed for a variety of applications where support for realtime multimedia services will be necessary. Support for these applications requires that the network is able to offer quality of service (QoS) appropriate for the latency and jitter bounds of the real-time application constraints. In this paper, we analyze the primary challenges of realizing QoS in mobile wireless networks with heterogeneous devices and propose a QoS framework for real-time traffic support. We address the problem in three ways: estimate the path quality for real-time flows, mitigate the impact of node heterogeneity on service performance, and reduce the impact of interfering non-realtime traffic. Specifically, our proposed QoS framework first utilizes a call setup protocol at the IP layer to discover paths for real-time flows, as well as to perform admission control by accurate service quality prediction. The underlying routing protocol also enables transparent path selection among heterogeneous nodes to provide stable paths for real-time traffic delivery. We then use a prioritized MAC protocol to provide priority access for flows with real-time constraints to reduce interference from unregulated non-real-time traffic. We foresee the utility of our proposed solution in heterogeneous mobile networks, such as campus or community-wide wireless networks. In these environments, resource-rich or fixed wireless routers may be leveraged to achieve better service quality when heterogeneity of node capability and movement is significant. Through experimental results, we demonstrate the utility and efficiency of our approach.

Efficient and Reliable Dissemination in Mobile Ad Hoc Networks by Location Extrapolation

“…Sun et al [17] propose a cross-layer QoS framework between MAC and IP for utilizing prioritization support in MAC. This paper assumes stability or low node mobility.…”

Disseminating data with time constraint based on multichannel over ubiquitous computing environments

“…Therefore, this study focuses on the problem of maintaining connectivity at the network and transport layer in spite of the mobility of the mobile hosts. Moreover, many researchers [25] have proposed supporting real time applications in a ubiquitous environment. Typical applications that require real-time services [30] include audio playback, image browsing, video conference ,and video-on-demand.…”