虚拟现实多径通信中的延迟和信息新鲜度
Latency and Information Freshness in Multipath Communications for Virtual Reality
摘要：
无线虚拟现实（VR）和增强现实（AR）将有助于人们越来越多地远程工作和社交。然而，VR/AR体验非常容易受到各种延迟和时间差异的影响，这可能导致晕动病和不适。本文建模和利用多路径和冗余的存在，以提高无线VR通信的定时性能。我们考虑多描述编码（MDC），一种方案，其中视频流被编码在Q个流（Q = 2在本文中）称为描述符和独立地提供了多个路径。我们还考虑了一个交替的方案，简单地切换路径之间。我们分析了两个相关指标的全分布：数据包延迟和信息的峰值年龄（PAOI），它测量接收器处的信息的新鲜度。结果显示了图像质量、帧速率和延迟之间有趣的权衡：完全复制导致更少的丢失帧，但比具有更少冗余的方案具有更高的延迟。即使是简单的交替方案也可以在PAoI方面优于复制，但MDC可以利用描述符的独立可解码性来更快地提供帧的基本版本，同时仍然以略高的延迟获得全质量帧。
英文摘要：
Wireless Virtual Reality (VR) and Augmented Reality (AR) will contribute to people increasingly working and socializing remotely. However, the VR/AR experience is very susceptible to various delays and timing discrepancies, which can lead to motion sickness and discomfort. This paper models and exploits the existence of multiple paths and redundancy to improve the timing performance of wireless VR communications. We consider Multiple Description Coding (MDC), a scheme where the video stream is encoded in Q streams (Q = 2 in this paper) known as descriptors and delivered independently over multiple paths. We also consider an alternating scheme, that simply switches between the paths. We analyze the full distribution of two relevant metrics: the packet delay and the Peak Age of Information (PAoI), which measures the freshness of the information at the receiver. The results show interesting trade-offs between picture quality, frame rate, and latency: full duplication results in fewer lost frames, but a higher latency than schemes with less redundancy. Even the simple alternating scheme can outperform duplication in terms of PAoI, but MDC can exploit the independent decodability of the descriptors to deliver a basic version of the frames faster, while still getting the full-quality frames with a slightly higher delay.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
