Abstract
The flourishing of Internet of Things (IoT) applications, characterized by vast transmitter populations and the sporadic transmission of small data units, demands innovative solutions for the sharing of the wireless medium. In this context, satellite connectivity is an important enabler for all scenarios in which terminals are under-served by terrestrial communications and are thus fundamental for providing worldwide coverage. In turn, the design of medium access policies that attain efficient use of the scarce spectrum and can cope with flexible yet unpredictable IoT traffic is of the utmost importance. Starting from these remarks, we investigate in this work the coexistence of a quality of service (QoS)-constrained service with IoT traffic in a shared spectrum as alternative to a more traditional orthogonal allocation among the two services, with an eye on satellite applications. Leaning on analytical tools, we provide achievable rate regions, assuming a slotted ALOHA access method for IoT terminals and accounting for practical aspects, such as the transmission of short packets. Interesting trends emerge, showcasing the benefit of an overlay allocation with respect to segregating the resources for the two services.
Highlights
Massive machine-type communications (MMTC) and the Internet of Things (IoT) are attracting steadily growing research and industry attention, emerging as a fundamental component for next-generation wireless systems
The selected configurations are in line with low-Earth orbit (LEO) satellite systems targeting IoT applications, e.g., [36]
We investigated the potential of letting two services, a quality of service (QoS)-constrained (Sa) and a mMTC (Sb), share a common spectrum by overlaying their transmissions in an additive white gaussian noise (AWGN) scenario modeling the uplink of a satellite communication system
Summary
Massive machine-type communications (MMTC) and the Internet of Things (IoT) are attracting steadily growing research and industry attention, emerging as a fundamental component for next-generation wireless systems. Examples of practical relevance span a wide set of scenarios, ranging from smart agriculture or industry, where sensors may collect data (e.g., temperature, pressure, and presence of chemical substances) and deliver status information to a common gateway, to environmental monitoring or asset tracking [1,2,3] Support for this multitude of use cases is already provided by terrestrial networks in a number of well-established commercial products [4], e.g., LoRa [5,6,7], SigFox [8], Ingenu [9], as well as by standardized approaches, such as NB-IoT and LTE-M [10]. Satellite IoT connectivity is one of the key scenarios included in the nonterrestrial networks (NTN) standardization efforts within the 3GPP ecosystem, and is aimed to become part of the standard already from Release 17
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