Showing papers by "Rapeepat Ratasuk published in 2015"

Random access response message transmission

Abstract: Systems, methods, apparatuses, and computer program products for random access procedure are provided. One method includes selecting, by a user equipment, a subframe for a first transmission of a preamble based on a configuration broadcast by an evolved node B (eNB). The method may also include repeating the preamble within a preamble repetition period based on a configuration broadcast by the eNB.

Frequency hopping method for machine type communication

Abstract: A method and apparatus may include receiving, by a machine type communication user equipment, parameters for frequency hopping in downlink or uplink. The parameters comprise an "X," 'Ύ," and "Z" parameters, "X" corresponds to a duration for which the same physical resource blocks are used for transmission. 'Ύ" corresponds to a frequency hopping period, and "Z" corresponds to a frequency hopping pattern indication. The method may also include performing frequency hopping in accordance with the parameters.

MACHINE-TYPE COMMUNICATIONS: CURRENT STATUS AND FUTURE PERSPECTIVES TOWARD 5G SYSTEMS The authors provide a clear mapping between the main MTC service requirements and their associated challenges. Their goal is to develop a comprehensive understanding of these challenges and the potential solutions. This study presents, in part, a roadmap from the current cellular technologies toward fully MTC-capable 5G mobile systems.

Abstract: Machine-type communications (MTC) enables a broad range of applications from mission-critical services to massive deployment of autonomous devices. To spread these applications widely, cellular systems are considered as a potential candidate to provide connectivity for MTC devices. The ubiquitous deployment of these systems reduces network installation cost and provides mobility support. However, based on the service functions, there are key challenges that currently hinder the broad use of cellular systems for MTC. This article provides a clear mapping between the main MTC service requirements and their associated challenges. The goal is to develop a comprehensive understanding of these challenges and the potential solutions. This study presents, in part, a roadmap from the current cellular technologies toward fully MTC-capable 5G mobile systems.

Clusterhead-based control for both in-coverage and out-of-coverage d2d communications

Abstract: Methods, apparatuses, and computer program products for providing uniform user equipment initialization procedure for both in-coverage and out-of-coverage device-to device communications are disclosed herein, incorporating a novel tri-timer design: an initial timer, a search timer, and an active timer. In a method a determination is made regarding a user equipment as being a clusterhead candidate which can act as a clusterhead of a cluster. The user equipment searches for a suitable cell or cluster to join. If a suitable cell or a cluster is not found, the user equipment is selected to be a clusterhead which will act as the clusterhead of its own cluster. After selecting the user equipment to be a clusterhead and establishing its cluster, the user equipment transmits a discovery signal which alerting other user equipment to the clusterhead, to which the other user equipment can join. The user equipment as clusterhead then maintains the cluster.