Please use this identifier to cite or link to this item:
https://hdl.handle.net/11000/5284
On the Capacity of 5G NR Grant-Free Scheduling
with Shared Radio Resources to Support
Ultra-Reliable and Low-Latency Communications
Title: On the Capacity of 5G NR Grant-Free Scheduling
with Shared Radio Resources to Support
Ultra-Reliable and Low-Latency Communications |
Authors: Lucas Estañ, María del Carmen Gozalvez, Javier ![](/image/ORCID.jpg) Sepulcre, Miguel ![](/image/ORCID.jpg) |
Department: Departamentos de la UMH::Ingeniería de Comunicaciones |
Issue Date: 2019-08-10 |
URI: http://hdl.handle.net/11000/5284 |
Abstract:
5G and beyond networks are being designed to support the future digital society,
where numerous sensors, machinery, vehicles and humans will be connected in the so-called
Internet of Things (IoT). The support of time-critical verticals such as Industry 4.0 will be especially
challenging, due to the demanding communication requirements of manufacturing applications
such as motion control, control-to-control applications and factory automation, which will require
the exchange of critical sensing and control information among the factory nodes. To this aim,
important changes have been introduced in 5G for Ultra-Reliable and Low-Latency Communications
(URLLC). One of these changes is the introduction of grant-free scheduling for uplink transmissions.
The objective is to reduce latency by eliminating the need for User Equipments (UEs—sensors, devices
or machinery) to request resources and wait until the network grants them. Grant-free scheduling
can reserve radio resources for dedicated UEs or for groups of UEs. The latter option is particularly
relevant to support applications with aperiodic or sporadic tra_c and deterministic low latency
requirements. In this case, when a UE has information to transmit, it must contend for the usage
of radio resources. This can lead to potential packet collisions between UEs. 5G introduces the
possibility of transmitting K replicas of the same packet to combat such collisions. Previous studies
have shown that grant-free scheduling with K replicas and shared resources increases the packet
delivery. However, relying upon the transmission of K replicas to achieve a target reliability level
can result in additional delays, and it is yet unknown whether grant-free scheduling with K replicas
and shared resources can guarantee very high reliability levels with very low latency. This is the
objective of this study, that identifies the reliability and latency levels that can be achieved by 5G
grant-free scheduling with K replicas and shared resources in the presence of aperiodic tra_c, and as
a function of the number of UEs, reserved radio resources and replicas K. The study demonstrates
that current Fifth Generation New Radio (5G NR) grant-free scheduling has limitations to sustain
stringent reliability and latency levels for aperiodic tra_c.
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Keywords/Subjects: grant-free scheduling URLLC ultra-reliable and low-latency communications 5G |
Knowledge area: . Ingeniería eléctrica. Electrotecnia. Telecomunicaciones |
Type of document: application/pdf |
Access rights: info:eu-repo/semantics/openAccess |
DOI: https://doi.org/10.3390/s19163575 |
Appears in Collections: Artículos Ingeniería Comunicaciones
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