In machine-type communications (MTC), contention-based random access is employed to
support a number of MTC devices with a limited number of resource blocks (RBs). Since …

In machine-type communication (MTC), since multiple active devices are located randomly
in a cell, the arrival time of multiple signals can be different. A priori information on the arrival …

As a building block toward a simple and scalable solution for massive random access, we
introduce collision-resolution algorithms using successive interference cancellation (SIC) …

Most existing studies on joint activity detection and channel estimation for grant-free massive
random access (RA) systems assume perfect synchronization among all active users, which …

In internet of things, a central node to multiple sensor nodes is usually a short-range
communication network, which generally uses random multiple access to resolve collision at …

In this paper, an improved preamble detection and round-trip delay (RTD) estimation
algorithm is proposed for random access, particularly in the context of airborne wireless …

Due to concurrent access attempts from massive machine-type devices (MTDs) within the
wide beam coverage, the existing contention-based random access (RA) scheme suffers …

In this paper, we propose an early preamble collision detection (e-PACD) scheme at the first
step of random access (RA) procedure based on tagged preambles (PAs), which consist of …

With the increasing number of Internet of Things (IoT) devices, machine-type communication
(MTC) has become an important use case of the fifth-generation communication systems …

The massive amounts of machine-type user equipments (UEs) will be supported in the future
fifth generation (5G) networks. However, the potential large random access (RA) delay calls …