Results 251 to 260 of about 4,905,659 (296)

Nitrogen vacancies in graphitic carbon nitride and their role in heterogeneous photocatalysis.

open access: yesMater Horiz
Landi A   +7 more
europepmc   +1 more source

Uplink Grant-Free NOMA With Sinusoidal Spreading Sequences

IEEE Transactions on Communications, 2021
Grant-access based legacy networks are unable to deliver Uplink (UL) dominated sporadic transmission of short packets with low signalling overhead, which are the requirements of Massive Machine Type Communication (mMTC). Hence, grant-free Non-Orthogonal Multiple Access (NOMA) techniques are more suited for mMTC. Due to the inherent sparsity in the user
Shah Mahdi Hasan   +2 more
openaire   +1 more source

Integrated Grant-Free Scheme for URLLC and mMTC

2020 IEEE 3rd 5G World Forum (5GWF), 2020
In this paper, we study a grant-free (GF) scheme to efficiently support the IoT user equipments (UEs). Compared with the existing studies regarding the GF schemes where only one type of the IoT UEs is considered, we develop an integrated GF scheme to support both the ultra-reliable low-latency communications (URLLC) and massive machine type ...
Seokjae Moon, Jang-Won Lee
openaire   +1 more source

HARQ-Based Grant-Free NOMA for mMTC Uplink

IEEE Internet of Things Journal, 2021
Massive machine-type communication (mMTC) is one of the most rewarding and at the same time challenging components in the fifth-generation (5G) cellular solutions supporting the Internet of Things (IoT). The 5G mMTC is considering the use of a combination of two key mMTC enabling technologies—grant-free (GF) transmission and nonorthogonal multiple ...
Faramarz Jabbarvaziri   +2 more
openaire   +1 more source

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