4 research outputs found
Can Terahertz Provide High-Rate Reliable Low Latency Communications for Wireless VR?
Wireless virtual reality (VR) imposes new visual and haptic requirements that
are directly linked to the quality-of-experience (QoE) of VR users. These QoE
requirements can only be met by wireless connectivity that offers high-rate and
high-reliability low latency communications (HRLLC), unlike the low rates
usually considered in vanilla ultra-reliable low latency communication
scenarios. The high rates for VR over short distances can only be supported by
an enormous bandwidth, which is available in terahertz (THz) frequency bands.
Guaranteeing HRLLC requires dealing with the uncertainty that is specific to
the THz channel. To explore the potential of THz for meeting HRLLC
requirements, a quantification of the risk for an unreliable VR performance is
conducted through a novel and rigorous characterization of the tail of the
end-to-end (E2E) delay. Then, a thorough analysis of the tail-value-atrisk
(TVaR) is performed to concretely characterize the behavior of extreme wireless
events crucial to the real-time VR experience. System reliability for scenarios
with guaranteed line-of-sight (LoS) is then derived as a function of THz
network parameters after deriving a novel expression for the probability
distribution function of the THz transmission delay. Numerical results show
that abundant bandwidth and low molecular absorption are necessary to improve
the reliability. However, their effect remains secondary compared to the
availability of LoS, which significantly affects the THz HRLLC performance. In
particular, for scenarios with guaranteed LoS, a reliability of 99.999% (with
an E2E delay threshold of 20 ms) for a bandwidth of 15 GHz along with data
rates of 18.3 Gbps can be achieved by the THz network (operating at a frequency
of 1 THz), compared to a reliability of 96% for twice the bandwidth, when
blockages are considered.Comment: arXiv admin note: text overlap with arXiv:1905.0765