KIPS Transactions on Computer and Communication Systems (정보처리학회논문지:컴퓨터 및 통신 시스템)

Korea Information Processing Society (한국정보처리학회)
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Flow-based Seamless Handover Scheme for WLANs Using an Overlaid 4G Network

중첩된 4G망을 이용한 플로우 기반의 끊김없는 WLAN 핸드오버 방안

  • Received : 2013.08.21
  • Accepted : 2013.12.09
  • Published : 2014.01.31
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Abstract

The rapid increase of mobile devices such as smart phone and smart pad have raised the needs for seamless multimedia services during moving at anytime and anywhere. Current 4G mobile devices are equipped with both 4G (LTE) and WLAN (WiFi) interfaces, and mobile services operators provide wireless Internet services using 4G network with a wider coverage and WiFi zone. Generally users prefer to use the Internet services through WLAN rather than LTE in the coverage of WLAN. However, since WLAN has a long L2 handover latency, it is difficult to support seamless services during a handover. In this paper, we proposed an efficient handover scheme based on flow mobility for WLANs to support a seamless service during handovers by using the overlaid 4G network with a wider coverage. Also, we showed the outperformance of the proposed scheme on a testbed.

스마트 폰, 스마트 패드 등 다양한 모바일 기기의 등장으로 언제, 어디서나 이동 중에도 끊김없는 멀티미디어 서비스의 필요성이 증대하고 있다. 현재 4G 모바일 기기들은 4G (LTE)와 WLAN (WiFi) 인터페이스를 동시에 가지고 있으며, 이동 통신사업자들은 커버리지가 넓은 4G망 뿐만 아니라 WiFi zone을 통하여 무선 인터넷 서비스를 지원하고 있다. 일반적으로 사용자들은 WLAN 커버리지내에서는 LTE를 통한 서비스 보다도 데이터 사용량에 제한이 없는 WLAN을 통한 서비스를 선호하고 있다. 그러나 WLAN은 L2 핸드오버 지연이 매우 크기 때문에 핸드오버를 수행하는 동안에 끊김없는 서비스가 어려운 문제가 있다. 본 논문에서는 flow mobility를 기반으로 WLAN 간에 핸드오버를 수행하는 동안 서비스 반경이 넓은 4G망을 활용하여 끊김없는 서비스를 지원할 수 있는 방안을 제안하였으며, 테스트베드 구현을 통하여 제안 방안의 우수성을 검증하였다.

Keywords

References

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