Hyun-yong Hwang

Dynamic RACH preamble allocation scheme

Machine-to-Machine (M2M) communication is used for automated data transmission and measurement between remote electronic devices. Every device that can use M2M communication will become a significant component of the Internet of Things (IoT) and Big Data. And there are many different applications of M2M communication (e.g., fleet management, smart metering, smart grid, and home/factory/city automation). Machine-Type-Communication (MTC) is a new service defined by the 3GPP to enable M2M devices to communicate with each other over LTE-Advanced cellular networks. Since the number of M2M devices can be fairly large compared to the H2H devices, current RACH procedure may cause a QoS degradation of H2H devices. In this paper, we propose a novel dynamic RACH preamble allocation scheme that can adjust the range of available RACH preamble according to network condition dynamically. The dynamic RACH preamble allocation scheme can be an efficient solution that can alleviate the overload problem.

An efficient signaling procedure for stationary machine type devices

This paper proposes an efficient signaling procedure for stationary machine type devices (MTDs). In the proposed scheme, network nodes store the parameters for the stationary MTDs in order to reduce the signaling overhead which can be generated during the configuration parameter setup process. In addition, by using the stored parameters, MTDs can transmit the small-sized data with the reduced signal procedure. The numerical results have shown that the proposed scheme can increase the number of supportable devices by about 93 % compared with the conventional scheme.

Random access method with access time distribution scheme

Machine-to-Machine (M2M) communication, a promising technology enables ubiquitous connection between massive autonomous devices without human intervention. M2M communication is one of the core technologies supporting data exchange among sensing devices, processing devices, and actuating devices to facilitate various M2M applications (e.g., telematics, smart metering, smart grid, and home/factory/city automation). Machine Type Communication (MTC) is a new service defined by the 3GPP to enable M2M devices to communicate with each other over LTE-Advanced cellular networks. For huge numbers of MTC devices, one of the challenging issues is to provide an efficient way for multiple access in the network. In this paper, we propose a novel scheme named Access Time Distribution (ATD) that can distribute access time to reduce a random access overload. The ATD scheme can be an effective solution that can alleviate the overload problem.

CAN gateway for fast vehicle to vehicle (V2V) communication

Intelligent transport systems (ITS) use information and communication technologies to improve vehicle safety on roadways and effective traffic flow management. A vehicle communicates with other vehicles and/or infrastructures with wired/wireless communication technologies. In-vehicle networks are composed of numerous electronic control units (ECUs) according to the type of service in various domains (e.g. powertrain domain, body domain, and chassis domain). Vehicle to vehicle (V2V) messages related to vehicle safety should meet low-latency requirements. In addition, the information contained in V2V messages is associated with specific ECUs. For the interworking between the V2V communications and in-vehicle networks, we should consider a new method that responses necessary ECUs for specific V2V message. In this paper, we propose an effective controller area network (CAN) gateway method. This method uses CAN gateway searching for a network table based on the CAN frame for V2V message. Because of simple structure and method, the proposed method can be a good solution that controls the ECUs with ease. And it also can make V2V messages at high speed.

Design of new AUTOSAR memory stack for diagnostic message

AUTOSAR was jointly developed by automotive manufacturers, suppliers, and semiconductor chip vendors in order to overcome the complexity of contemporary automotive Electrics/Electronics architecture. AUTOSAR provides memory cluster for reading and writing data to non-volatile memory media such as Flash or EEPROM memory. In this paper, we propose new memory cluster architecture which can access internal RAM, Flash ROM, and EEPROM directly. The new architecture which has additional function is AUTOSAR-compliant memory cluster architecture which can access Flash memory and EEPROM respectively. And it can also access internal RAM, Flash ROM, and EEPROM by using diagnostic message. To make a component based design possible, we designed memory cluster modules that use a layered architecture that supports the decoupling of automotive hardware and system software.