Tae-Sub Kim

Vertical handover between LTE and wireless LAN systems based on common resource management (CRRM) and generic link layer (GLL)

It is expected that many heterogeneous wireless networking systems such as 3GPP Long-term Evolution (LTE) systems, WiMAX/WiBro systems and WLAN systems will be exist in next generation wireless communication environment. Under such environment, various communication services will be introduced by integrating heterogeneous wireless networking technologies, especially at the radio access networks. In order to provide such integrated communication services, integrated radio resource management and seamless vertical handover across such heterogeneous access networks should be supported. In this paper, to tackle these problems, we propose a Generic Link Layer (GLL) based common radio resource management (CRRM). In particular, we propose the network architecture and functions of each network element for integrated radio resource management among heterogeneous access networks. Then, we propose policy-based and multi criteria decision making (MCDM) based seamless vertical handover schemes between LTE and next generation WLAN systems. Performance of the proposed vertical handover schemes are evaluated via extensive simulation studies. Simulation results show that the proposed VHO schemes outperform other VHO schemes such as received signal strength (RSS) based VHO scheme in terms of throughput, handover success rate and the service cost.

Designs of a Secure Wireless LAN Access Technique and an Intrusion Detection System for Home Network

IEEE 802.11i standard supports a secure access control for wireless LAN and IEEE 802.1x standard includes various authentication method protocols. It is expected that next generation wireless LAN security techniques will be based on IEEE 802.1x and IEEE 802.11i standards. However, at present users who are not familiar with a computer and an authentication details have difficulty to setup the network security based on IEEE 802.11i. Accordingly, this paper proposes authentication scenarios to minimize the process needed by users, a password method which is changed randomly and periodically, and authentication protocols. The proposed protocols provide convenience for nonprofessional computer users as well as secure the home network environment against the unwanted attacks such as a dictionary attack or a replay attack and it uses SNMP and the system to be able to detect an intrusion it supposes will occur.

Proximity User Detection Based Resource Allocation Scheme for Device-to-device Communication

Abstract In this paper, we propose a resource allocation schemes, called proximity user detection-based resource allocation (PUDRA), or advanced proximity user detection-based resource allocation (APUDRA) in an LTE-Advanced device-to-device (D2D) network. In the proposed schemes, in order to reduce the interference between macro user equipment (mUEs) and D2D links or between D2D links, D2D link shall use a frequency bandwidth that the neighboring mUEs or D2D links do not use. We analyzed and compared the two schemes and the random resource allocation scheme in terms of the system throughput for downlink and outage probability according to the number of D2D receivers (D2DRs). Simulation results show that the APUDRA scheme has better performance than the PUDRA and random resource allocation scheme performance in terms of the system throughput and outage probability for mUEs and D2DRs.

Vertical Handoff Decision System based on Support Vector Machine

It is expected that many heterogeneous wireless systems, such as 3GPP LTE systems, WiMAX systems and WLAN systems, will coexist in the next generation wireless communication environments. Integrated radio resource management and seamless vertical handoff (VHO) should be supported to provide integrated communication services over multi-radio access networks. A new class of adaptive VHO system that views the handoff problem as a pattern recognition problem is proposed. In this paper, we propose a unified radio resource management (URRM) architecture and Support Vector Machine (SVM) based vertical handoff decision system. Extensive simulation studies show the proposed VHO algorithm outperforms RSS based VHO algorithms in terms of throughput and service cost.