1. Kongju National University,Division of Information & Communication Engineering,Cheonan,Korea
2. Pukyong National University,Department of Information and Communication Engineering,Busan,Korea
3. Electronics and Telecomm. Research Institute,Mobile Core Network Research Section,Daejeon,Korea
4. Kyung Hee University,Department of Electronic Engineering,Yongin-Si,Korea
5. Soonchunhyang University,Department of Internet of Things,Asan,Korea