This paper experimentally analyzes the negative impact of contention caused by neighboring Wi-Fi networks operating on overlapping channels on Virtual Reality (VR) streaming over Wi-Fi, focusing on scenarios of partial and full channel overlap within an 80 MHz channel. Our results show that (i) increasing the number of 80 MHz Overlapping Basic Service Sets (OBSSs) intensifies contention and degrades VR streaming performance; (ii) OBSS activity on the secondary-sided 40 MHz portion degrades performance more than activity on the primary-sided 40 MHz portion; (iii) for the same aggregate load, full channel overlap with two 40 MHz OBSS contenders is less detrimental than partial overlap with a single high-load 40 MHz contender, but more disruptive than full overlap with two 80 MHz contenders; and (iv) full channel overlap with two 40 MHz OBSS contenders has a smaller impact on VR streaming under symmetric traffic loads than under asymmetric loads. Moreover, our results demonstrate that our previously proposed Network-aware Step-wise adaptive bitrate algorithm for VR streaming (NeSt-VR) effectively mitigates performance degradation in OBSS environments, enabling VR streaming under heavier OBSS traffic conditions.

翻译：本文通过实验分析了相邻Wi-Fi网络在重叠信道上运行所产生的竞争对基于Wi-Fi的虚拟现实（VR）流传输的负面影响，重点关注80 MHz信道内部分重叠与完全重叠的场景。我们的研究结果表明：（i）增加80 MHz重叠基本服务集（OBSS）的数量会加剧竞争并降低VR流传输性能；（ii）在次侧40 MHz频段上的OBSS活动比在主侧40 MHz频段上的活动对性能的影响更大；（iii）在相同总负载条件下，与两个40 MHz OBSS竞争者完全重叠信道的情况，比与单个高负载40 MHz竞争者部分重叠信道的损害更小，但比与两个80 MHz竞争者完全重叠信道的破坏性更大；（iv）在对称流量负载下，与两个40 MHz OBSS竞争者完全重叠信道对VR流传输的影响小于非对称负载下的影响。此外，我们的结果表明，我们先前提出的用于VR流传输的网络感知步进式自适应比特率算法（NeSt-VR）能有效缓解OBSS环境下的性能下降，使VR流传输能够在更重的OBSS流量条件下实现。