Nam Hoon Park

Solving the data overload: Device-to-device bearer control architecture for cellular data offloading

The explosive growth of the mobile user population and multimedia services are causing a severe traffic overload problem in the cellular network. The Third-Generation Partnership Project (3GPP) has defined data offloading as a critical area to cope with this problem. Local IP access (LIPA) and selected IP traffic offload (SIPTO) are considered to be the typical technologies to implement cellular data offloading. Currently, device-to-device (D2D) communication has been proposed as a new dataoffloading solution. The D2D communication underlying a cellular infrastructure reduces the radio access network load as well as the core network load. The cellular network needs to establish a new type of radio bearer for D2D communications, and this bearer can provide the direct traffic path between devices. In this article, we propose a D2D bearer control architecture for D2D communications supported by a longterm evolution-advanced (LTE-A) infrastructure. This could be a feasible and efficient solution for offloading data from the cellular network.

Development of device-to-device(D2D) communication based new mobile proximity multimedia service business models

Mobile and wireless technology is advancing forward to deliver more connected devices and richer multimedia content and applications. The number of mobile subscriptions continues to grow along with an explosive increase in the mobile data traffic demand. Thereby, it creates a significant network capacity shortage concerns for mobile network operators. In order to address this problem, it is essential to increase the network capacity at a low additional cost. The device-to-device (D2D) communication based proximity service is believed to have a promising future mobile communication technology that is capable to create new mobile service opportunities and offload traffic to the eNB. In this article, we present perspectives, possibilities and challenging issues of the D2D communication based new mobile proximity multimedia services. Based on the scenario analysis process, we propose three types of D2D services, an Ad hoc D2D type, an agent-based D2D type and a mesh D2D type. Finally, we argue on the several challenging issues that are essential in provisioning the D2D based proximity services.