Laihyuk Park
  Woongsoo Na
  WiMAX mobile devices are known to have severe communication qualities due to signal degradation in cell boundaries and shaded areas. To solve this problem, various researches attempt to increase signal sensitivity in those areas [1][2]. For instance, vehicles can be equipped with WiMAX antenna on the roof or glass of the vehicle so that the mobile devices can increase receiver signal sensitivity. Through this approach, a large variety of applications can be created by passing the WiMAX traffic to mobile devices in the vehicle. The vehicle might use a gateway that transparently distributes the WiMAX data to mobile users to augment the WiMAX data service. One of the potential technologies achieving this goal would be via wireless local area network (WLAN) such as IEEE 802.11. However, if a significant number of APs are densely located, the throughput of the mobile devices will be tremendously degraded due to interference among the WiFi networks.
Basic Vehicle Model

  In this research, we assume that vehicles are embedded with WiMAX antenna which distributes WiMAX traffic to WiFi in-vehicle wireless devices forming a basic service set (BSS). We research a mobility-aware interference avoidance scheme among those BSSs which works well even under the situation that BSSs are densely located. Therefore, to cope with dynamicity of the topology, we exploit mobility vector and location information of neighboring APs from a global positioning system (GPS).
            
(a) Short interference duration        (b) Long interference duration
Different interference duration due to dynamicity of the topology
내장형 안테나 어레이 기반의 차세대 차량용 이동통신 시스템 기술 연구 (Next Generation Vehicular Mobile Service System based on Embedded Antenna Array), KCC, 2009.03~2012.02 [ppt]
휴대폰을 이용한 차량용 개인화 서비스 플랫폼 기술 개발 (Personalized Service Platform for Vehicular Services using Smart Phone), KAIARI, 2010.06~2011.05 ETRI, 2010.06~2011.01 [Final Report] [ppt]
L. Park, G. Lee, W. Na, C. Lee, C. Park, Y. Cho, and S. Cho, " Mobility-Aware Interference Avoidance Scheme for Vehicular WLANs," KSII Transactions on Internet and Information Systems, vol. 5, no. 12, pp. 2272-2293, December 2011. [PDF]
최용훈, 이정륜, 조성래, 조용수, "차량 이동성 관리 표준화 및 연구 동향," 한국통신학회학회지 (정보와통신), 제29권, 제2호, February 2012. [PDF]
조용수, 추호성, 임성준, 이정우, 이정륜, 최용훈, 조성래, 고요한, "내장형 안테나 어레이 기반의 차세대 차량용 이동통신 시스템 기술," 한국통신학회학회지 (정보와통신), 제28권, 제2호, January 2011. [PDF]
박래혁, 이건우, 나웅수, 조성래, "모바일 IEEE 802.11 BSS간 지능적 간섭회피 기법(Intelligent Interference Avoidance Scheme for Mobile IEEE 802.11 BSS)," 한국통신학회논문지, 제35권, 제10호, October 2010. [PDF]
나웅수, 배형철, 조성래, "IEEE802.11 기반 모바일 BSS 및 고정 BSS간 지능적 간섭 회피 기법(A Novel Interference Avoidance Technique for Mobile BSS and Fixed BSS," 한국통신학회 추계종합학술발표회, 서강대학교, November 2011. 우수논문상 (Best Paper Award), [PDF]
나웅수, 이건우, 박래혁, 서승범, 조성래, 장한식, "휴대폰을 이용한 차량 내 개인화 서비스 플랫폼(A Personalization Service Platform in Vehicle Using Cellular Phone)," 한국통신학회 동계종합학술발표회, 강원도 용평, February 2011. [PDF]