Priority-based initial access for URLLC traffic in massive IoT networks: Schemes and performance analysis
Peer reviewed, Journal article
Accepted version
Permanent lenke
https://hdl.handle.net/11250/3070117Utgivelsesdato
2020Metadata
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Originalversjon
Weerasinghe, T. N., Balapuwaduge, I. A.M. & Li, F. Y. (2020). Priority-based initial access for URLLC traffic in massive IoT networks: Schemes and performance analysis. Computer Networks, 178, 1-16.doi: 10.1016/j.comnet.2020.107360Sammendrag
At a density of one million devices per square kilometer, the10’s of billions of devices, objects, and machines
that form a massive Internet of things (mIoT) require ubiquitous connectivity. Among a massive number of
IoT devices, a portion of them require ultra-reliable low latency communication (URLLC) provided via fifth
generation (5G) networks, bringing many new challenges due to the stringent service requirements. Albeit a surge
of research efforts on URLLC and mIoT, access mechanisms which include both URLLC and massive machine
type communications (mMTC) have not yet been investigated in-depth. In this paper, we propose three novel
schemes to facilitate priority-based initial access for mIoT/mMTC devices that require URLLC services while also
considering the requirements of other mIoT/mMTC devices. Based on a long term evolution-advanced (LTEA) or 5G new radio frame structure, the proposed schemes enable device grouping based on device vicinity
or/and their URLLC requirements and allocate dedicated preambles for grouped devices supported by flexible
slot allocation for random access. These schemes are able not only to increase the reliability and minimize the
delay of URLLC devices but also to improve the performance of all involved mIoT devices. Furthermore, we
evaluate the performance of the proposed schemes through mathematical analysis as well as simulations and
compare the results with the performance of both the legacy LTE-A based initial access scheme and a grant-free
transmission scheme.