Massive machine-type communications (mMTC) is one of the main three focus areas in the
5th generation (5G) of wireless communications technologies to enable connectivity of a …

Massive access, also known as massive connectivity or massive machine-type
communication (mMTC), is one of the main use cases of the fifth-generation (5G) and …

As one of the key enabling technologies of emerging smart societies and industries (ie,
industry 4.0), the Internet of Things (IoT) has evolved significantly in both technologies and …

In this paper, we consider a massive grant-free non-orthogonal multiple access (GF-NOMA)
scheme, where devices have strict latency requirements and no retransmission …

Low-Earth orbit (LEO) satellites can play an important role in providing seamless coverage
for the Internet of Things (IoT). In satellite-based IoT (SIoT) networks, IoT devices can …

This paper considers the massive connectivity problem in an asynchronous grant-free
random access system, where a huge number of devices sporadically transmit data to a …

In this article, we propose a two-tier communication strategy to facilitate data collection in
unmanned aerial vehicle (UAV)-enabled massive Internet of Things (IoT) systems through …

Massive MIMO based grant-free random access (mGFRA) is a promising RA technique for
massive access with low signaling overhead. However, due to a limited orthogonal …

This paper considers joint active user detection (AUD) and channel estimation (CE) for
massive connectivity scenarios with sporadic traffic. The state-of-art method under a …

Although grant-based mechanisms have been a predominant approach for wireless access
for years, the additional latency required for initial handshake message exchange and the …