무선 LAN에서 Ad-Hoc과 Infrastructure 모드의 자동전환 기술 설계 및 구현

Design and Implementation of an Automatic Switching Technology Between Ad-Hoc and Infrastructure Modes in Wireless LANs

  • 신택수 (광운대학교 전자통신공학과 통신프로토콜 연구실) ;
  • 조성민 (광운대학교 전자통신공학과 통신프로토콜 연구실) ;
  • 민상원 (광운대학교 전자통신공학과 통신프로토콜 연구실)
  • 발행 : 2006.09.01

초록

본 논문은 IEEE 802.11b-무선 LAM 환경에서 ad-hoc 방식과 infrastructure 방식 사이의 자동 모드 전환 기술을 제안하였다. 또한 관련된 기술을 Linux 환경에 맞추어 설계 및 구현을 하였다. 제안된 메커니즘은 AP (Access Point) 서비스 영역 외곽에 switching area를 정의하고 해당 영역에 머무르는 노드는 AP와 음영지역에 있는 ad-hoc 노드를 연결 가능하게 해준다. 본 기술을 활용하여 기존 IEEE 802.11b 환경에서는 서비스가 불가능한 음영지역에 있는 노드에게도 인터넷 서비스를 제공할 수 있게 한다. 성능 검증은 switching area 감지, 패킷 전달 상황 캡춰, FTP 전송을 통한 처리량 측정으로 이루어졌고 그 결과 제안된 메커니즘기 무선 LAN 서비스를 향상 시킨다는 것을 확인할 수 있었다.

In this paper, we propose an automatic switching technology between the ad-hoc and the infrastructure modes without user intervention in the IEEE 802.11b wireless LAN. Also, we design our proposed technology and implemented on the Linux machine. For this operation, the area within an Access Point (AP) coverage is defined as a switching area, and a node without any transmission in this area is assumed to be able to relay frames between the AP and nodes in the shaded area that is outside the coverage and cannot reach the AP. By using the proposed technology, it is possible to provide the seamless Internet access service to nodes at the ad-hoc mode in the shaded area. In this paper, we explains the operation of the detection method of the switching area, presents the flowchart and implementation environment. To prove the operation of our technology, we obtain the results of captured packets transmitted between nodes and throughput results through ftp transmission experiment. Hence, we can see that our proposed scheme can be improve the wireless access service in wireless and mobile networks.

키워드

참고문헌

  1. S. Corson et al.,. 'Mobile Ad-Hoc Networking (MANET): Routing Protocol Performance Issues and Evaluation Considerations,' RFC 2501, IETF, January 1999
  2. IEEE Std. 802.11-1997, 'Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications,' November 1997
  3. IEEE Std. 802. 11b-1999, 'Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifiations: Higher-Speed Physical Layer Extension in the 2.4 GHz Band,' September 1999
  4. E. Amre, 'Implementation Options for the Distribution System in the 802.11 Wireless LAN Infrastructure Network,' IEEE International Conference, 2000
  5. S. Basagni et al., Mobile Ad-Hoc Networking, Wiley-Interscience, 2005
  6. C. Siva Ram Murthy et al., Ad-Hoc Wireless Networks - Architectures and Protocols, Prentice Hall PTR, 2004
  7. M. S. Gast, 802.11 Wireless Networks The Definitive Guide, O'reilly, 2002
  8. F. Rob, Building Wireless Community Networks, O'reilly, 2002
  9. 신택수, 민상원, 'WLAN에서 자동 BSS-IBSS 모드 변환 기능 연구,' 한국통신학회 하계종합학술발표회, 2004
  10. S. Michel, 'The Linux iPAQ HOWTO,' http://mstempin.free.fr/linux-ipaq
  11. T. Jean, 'Linux Wireless LAN HOWTO, ' http://www.hpl.hp.com/persoal/Jean_Tourrilhes/Linux/Wireless.html
  12. G. David, 'Wireless Networking with Linux and IEEE 802.11b,' Linux-Kongress, 2001
  13. R. Love, Linux Kernel Development - A Practical Guide to The Design and Implementation of The Linux Kernel, Developer's Library, 2004
  14. K. Wehrle et al., The Linux Networking Architecture - Design and Implementation of Network Protocols in The Linux Kernel, Prentice-Hall, 2005
  15. W. Stevens, Advanced Programming in The UNIX Environment 2nd, Addison-Wesley, 2005
  16. A. Rubini et al., Lima: Device Drivers- 3nded., O'reilly, 2005
  17. D. Bovet et aI., Understanding The Linux Kernel - 2nded., O'reilly, 2003