A QoS-aware routing protocol with adaptive feedback scheme for video streaming for mobile networks

One of the major challenges for the transmission of time-sensitive data like video over mobile ad-hoc networks (MANETs) is the deployment of an end-to-end QoS support mechanism. Therefore, several approaches and enhancements have been proposed concerning the routing protocols. In this paper we propose a new QoS routing protocol based on AODV (named AQA-AODV), which creates routes according to application QoS requirements. We have introduced link and path available bandwidth estimation mechanisms and an adaptive scheme that can provide feedback to the source node about the current network state, to allow the application to appropriately adjust the transmission rate. In the same way, we propose a route recovery approach into the AQA-AODV protocol, which provides a mechanism to detect the link failures in a route and re-establish the connections taking into account the conditions of QoS that have been established during the previous route discovery phase. The simulation results reveal performance improvements in terms of packet delay, number of link failures and connection setup latency while we make more efficient use of the available bandwidth than other protocols like AODV and QAODV. In terms of video transmission, the obtained results prove that the combined use of AQA-AODV and the scalable video coding provides an efficient platform for supporting rate-adaptive video streaming.Castellanos Hernández, WE.; Guerri Cebollada, JC.; Arce Vila, P. (2016). A QoS-aware routing protocol with adaptive feedback scheme for video streaming for mobile networks. Computer Communications. 77:10-25. doi:10.1016/j.comcom.2015.08.012S10257

Multi-description multipath video streaming in wireless ad hoc networks

In this paper, multiple description coding (MD coding or MDC) coupled with multipath transport is considered to provide robust video streaming in error-prone wireless ad hoc networks. Two problems are investigated for multi-description multipath (MDMP) video streaming in the unicast setting. The first one addresses multipath selection for balanced two-description coded video streaming. An interference-aware MDMP routing is formulated for single-radio networks by employing a time-division link scheduling method to eliminate interference, based on which an optimal path selection associated with the minimum reconstruction distortion of received video may be obtained with high complexity. A heuristic solution of low complexity is developed for the interference-aware multipath routing, by introducing a path metric taking into account intra-flow interference, inter-flow interference, link bandwidth and link “up” probability. The second problem touches on unbalanced-path based joint MD video coding and packet allocation for multiple paths of varying bandwidth and loss probabilities. An unbalanced-path based joint two-description video coding and description packet allocation utilizing redundant slices is proposed, which allocates slices in each description to two paths with varying bandwidth and optimally selects the amount of inserted redundancy according to different loss rates. Simulation results demonstrate the effectiveness of both the proposed MDMP routing scheme and the unbalanced-path based joint MD video coding and packet allocation approach in the wireless ad hoc networks