Grant-Free Radio Access for Short-Packet Communications over 5G Networks

Amin Azari, Petar Popovski, Guowang Miao, Cedomir Stefanovic

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

34 Citations (Scopus)


Radio access management plays a vital role in delay and energy consumption of connected devices. The radio access in existing cellular networks is unable to efficiently support massive connectivity, due to its signaling overhead. In this paper, we investigate an asynchronous grant-free narrowband data transmission protocol that aims to provide low energy consumption and delay, by relaxing the synchronization/reservation requirement at the cost of sending several packet copies at the transmitter side and more complex signal processing at the receiver side. Specifically, the timing and frequency offsets, as well as sending of multiple replicas of the same packet, are exploited as form of diversities at the receiver-side to trigger successive interference cancellation. The proposed scheme is investigated by deriving closed-form expressions for key performance indicators, including reliability and battery-lifetime. The performance evaluation indicates that the scheme can be tuned to realize long battery lifetime radio access for low-complexity devices. The obtained results indicate existence of traffic load regions, where synchronous access outperforms asynchronous access and vice versa.

Original languageEnglish
Title of host publicationProceedings of IEEE Global Communications Conference Globecom 2017
Number of pages7
Publication date2018
ISBN (Print)978-1-5090-5020-8
ISBN (Electronic)978-1-5090-5019-2
Publication statusPublished - 2018
EventIEEE GLOBECOM 2017: Global Hub: Connecting East and West - , Singapore
Duration: 4 Dec 20178 Dec 2017


ConferenceIEEE GLOBECOM 2017
Internet address


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