MOTH- Mobility-induced Outages in THz: A Beyond 5G (B5G) application

Rohit Singh, Douglas C. Sicker, Kazi Mohammed Saidul Huq

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


5G will enable the growing demand for Internet of Things (IoT), high-resolution video streaming, and low latency wireless services. Demand for such services is expected to growth rapid, which will require a search for Beyond 5G technological advancements in wireless communications. Part of these advancements is the need for additional spectrum, namely moving toward the terahertz (THz) range. To compensate for the high path loss in THz, narrow beamwidths are used to improve antenna gains. However, with narrow beamwidths, even minor fluctuations in device location (such as through body movement) can cause frequent link failures due to beam misalignment. In this paper, we provide a solution to these small-scale indoor movement that result in mobility-induced outages. Like a moth randomly flutters about, Mobility-induced Outages in THz (MOTH) can be ephemeral in nature and hard to avoid. To deal with MOTH we propose two methods to predict these outage scenarios: (i) Align-After-Failure (AAF), which predicts based on fixed time margins, and (ii) Align-Before-Failure (ABF), which learns the time margins through user mobility patterns. In this paper, two different online classifiers were used to train the ABF model to predicate if a mobility-induced outage is going to occur; thereby, significantly reducing the time spent in outage scenarios. Simulation results demonstrate a relationship between optimal beamwidth and human mobility patterns. Additionally, to cater to a future with dense deployment of Wireless Personal Area Network (WPAN), it is necessary that we have efficient deployment of resources (e.g., THz-APs). One solution is to maximize the user coverage for a single AP, which might be dependent on multiple parameters. We identify these parameters and observe their tradeoffs for improving user coverage through a single THz-AP.
Original languageEnglish
Title of host publication2020 IEEE 17th Annual Consumer Communications and Networking Conference, CCNC 2020
Place of PublicationLas Vegas, NV, USA, USA
PublisherInstitute of Electrical and Electronics Engineers
Number of pages9
ISBN (Electronic)9781728138930
ISBN (Print)978-1-7281-3894-7
Publication statusPublished - 26 Mar 2020
Externally publishedYes

Publication series

Name2020 IEEE 17th Annual Consumer Communications and Networking Conference, CCNC 2020


  • Beam Alignment
  • Beyond 5G (B5G)
  • Indoor Mobility
  • Online Perceptron
  • Online Stochastic Gradient Descent (SGD)
  • Terahertz (THz)


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