A MPTCP-based RTT-aware Packet Delivery Prioritisation Algorithm in AR/VR Scenarios

Abstract

This work proposes, describes and performs performance analysis of a Round-Trip Time (RTT)-aware packet delivery prioritisation algorithm (RDPA) for networked Augmented Reality/Virtual Reality (AR/VR) content distribution. In this approach, the proposed algorithm uses the built-in multipath delivery feature of MPTCP. RDPA tracks, identifies and redirects the priority packets through the subflow that presents best opportunities to deliver the content with the lowest latency in the next transmission interval. This subflow selection is based on a linear regression that analyses each subflow behaviour and identifies the best subflow in terms of latency. The assessment of this algorithm is performed in a Network Simulator 3-based simulation environment and indicates performance improvements varying from 8% to 36% (peak performance) when compared with the MPTCP default operation.

An Innovative Algorithm for Improved Quality Multipath Delivery of Virtual Reality Content

“…1) Linear regression: For the sake of a light-weight algorithm, this work extends a previous research [22], [27] and simplifies the linear regression applied to PHB report to extract only the slope of the linear regression for any given subflow feature performance (delay, throughout, etc.). Equation 1 describes how the slope is obtained (i.e., in this case, it is the covariance of x and y divided by the sum of squares (variance) of x).…”

“…In [21], a network performance enhancement using a Redundant MPTCP (RMPTCP) packet scheduler targeting optimal failover time and smoother latency variations was developed. The authors in [22] demonstrated the benefits achieved by improving the management of the subflow communication while. the work in [23] demonstrates the benefits of an improved MPTCP congestion control.…”

“…The motivation behind the definition of these weights sought to explore the impact of QM4VR when improving specific VR dataflows (e.g., tracking and interaction) in the VR environment and, for that matter, QM4VR targets the improvement of the latency (decreasing delay) and throughput (increasing overall combined MPTCP performance). For assessment purposes, QM4VR algorithm is compared to the following two algorithms: Default -a round-robin approach based on MPTCP (employs the default MPTCP NS-3 implementation) and RTTLow -a RTT-aware MPTCP enhancement (focuses on achieving a low RTT average value [22]). The graphs in Figure 8 depict the results for use cases t1, t2 and t3 configured as described in Table II.…”