The KIPS Transactions:PartC (정보처리학회논문지C)

Korea Information Processing Society (한국정보처리학회)
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A scheme to minimize transmission delay during handoff for rt-VBR service in the wireless ATM Networks

무선 ATM에서 핸드오프 동안 실시간 VBR 서비스를 위한 전송 지연의 최소화 방안

  • 김준배 (청주대학교 대학원 전자공학과) ;
  • 장동혁 (충청대학 컴퓨터학부) ;
  • 이선숙 (대전대학교 교육대학원) ;
  • 이재홍 (담양대학 인터넷정보미디어공학부) ;
  • 김승환 (충청대학 컴퓨터학부) ;
  • 권오석 (충남대학교 컴퓨터공학과) ;
  • 박진수 (청주대학교 전자공학과)
  • Published : 2002.04.01
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Abstract

In general, requirements for QoS are different according to the type of services in wire-line and wireless ATM networks, and real-time video service is more sensitive to cell transmission delay than to cell loss. Existing handoff schemes emphasizing prevention of cell loss had limitations in cell transmission delay to satisfy QoS. In this paper, a novel scheme to transmit ATM cells with low CLP(when CLP = 0) prior to others and discarding cells with high CLP(when CLF = 1) in ATM cell header among cells to be forwarded to new base station during handoffs in real-time VBR service is proposed. The proposed scheme is proven to be suitable for the satisfaction of QoS of real-time VBR service and appropriate for fast handoffs by giving high CLP value to less meaningful MPEG frames through simulations.

일반적으로 유선 및 무선 ATM망에서 서비스 품질(QoS)에 대한 요구 사항은 서비스 유형에 따라 다르며, 실시간 비디오 서비스는 셀 손실보다 셀 전송 지연에 더 민감하다. 셀 손실 방지를 강조하고 있는 기존 핸드오프 방안들은 QoS를 만족시키기 위해 셀 전송 지연이 큰 단점을 가지고 있었다. 본 논문에서는 실시간 VBR 서비스에서 핸드오프 동안 새로운 기지국으로 전달될 셀 들 중에서 ATM 셀 헤더의 셀손실 우선순위(CLP)가 낮은 셀은 전달하고 CLP가 높은 셀은 폐기함으로써 셀 전송 지연을 최소화하는 방안을 제안한다. 제안된 방안은 MPEG 비디오 프레임을 대상으로 시뮬레이션을 통해 실시간 VBR 서비스의 QoS를 만족시키고 신속한 핸드오프에 적절하다는 것을 보여 주었다.

Keywords

References

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