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A TXOP Sharing Scheme for QoS Strategy of IEEE 802.11ac DL MU-MIMO MAC

IEEE 802.11ac DL MU-MIMO MAC의 QoS 정책을 고려한 TXOP 공유 방안

  • Lee, Ji-Young (Dept. of Advanced Engineering, Graduate School, Kyungnam University) ;
  • Seok, Seung-Joon (Dept. of Computer Engineering, Kyungnam University)
  • 이지영 (경남대학교 대학원 첨단공학과) ;
  • 석승준 (경남대학교 컴퓨터공학과)
  • Received : 2014.08.18
  • Accepted : 2014.10.20
  • Published : 2014.10.28

Abstract

To improve the efficiency of wireless channel, IEEE 802.11ac uses the DL MU-MIMO MAC scheme through which an AP transmits multiple frames to different mobile nodes simultaneously. IEEE 802.11ac DL MU-MIMO MAC needs a new step, called as TXOP sharing, between legacy IEEE 802.11n DL SU-MIMO's two operations, the obtaining an EDCA TXOP and the transmitting multiple frames for EDCA TXOP. In the TXOP sharing operation, both wireless channel destinations and frames transmitted for its TXOP period should are determined. So this paper deals with the TXOP sharing for improving IEEE 802.11ac MAC performance. However, the EDCA priority based method mentioned by IEEE 802.11ac standard document not fair among the buffers and the frames of buffers, and occurs in high_loss rate and high_delay about specific buffers. In this paper, we propose a new scheme of the TXOP sharing with sequencing p-AC, s-AC in similar properties, and all S-AC. This method provides a differentiated service without damage of EDCA characteristics.

IEEE 802.11ac 무선 랜에서는 무선 채널의 효율성을 높이기 위하여 공간 분할된 다중채널을 활용하여 AP로부터 다중의 단말기들을 향해 서로 다른 프레임들을 동시에 전송할 수 있는 DL MU-MIMO MAC 기술을 도입하였다. IEEE 802.11ac DL-MIMO MAC 기술은 기존 DL SU-MIMO MAC 동작의 두 단계 동작인 무선채널 획득단계와 프레임 전송단계 사이에 TXOP 기간 동안 채널별 목적지 단말기와 전송될 프레임을 선정하는 TXOP 공유단계가 있다. 따라서 IEEE 802.11ac의 MAC 성능을 향상시키기 위해서는 TXOP 공유단계의 성능이 중요하게 고려되어야 한다. 하지만 표준에서 예시적으로 제시한 우선순위 TXOP 공유방식은 버퍼와 버퍼 내 프레임에 대하여 공정하게 다루지 못하고, 많은 지연시간과 특정 버퍼에 대해서는 높은 손실률을 일으키는 문제점이 있다. 본 논문에서는 각 AC가 가지고 있는 속성의 특성을 최대한 살기기 위하여 p-AC, 유사속성 s-AC, 전체 s-AC, 순으로 TXOP를 공유하는 방안을 제시한다. 이는 기존의 EDCA 특성을 해치지 않는 범위 내에서 차별화된 서비스를 제공할 수 있는 방법이다.

Keywords

References

  1. Eng Hwee Ong, Kneckt, J., Alanen, O., Zheng Chang, Huovinen, T., Nihtila, T., "IEEE 802.11ac: Enhancements for very high throughput WLANs," IEEE 22nd International Symposium on Personal Indoor and Mobile Radio Communications (PIMRC 2011), pp.849-853, 2011.
  2. Haoming Li, Alireza Attar and Victor C. M. Leung, "Multi User Medium Access Control in Wireless Local Area Network,"Wireless Communications and Networking Conference(IEEE WCNC 2010), 2010.
  3. Chunhui Zhu, Bhatt, A., Youngsoo Kim, Aboul-magd, O. and Chiu Ngo, "Multi-User Support in Next Generation WLAN," The IEEE Consumer Communications and Networking Conference, pp.1120-1121, 2011.
  4. Chunhui Zhu, Bhatt, A., Youngsoo Kim, Aboul-magd, O. and Chiu Ngo, "MAC Enhancements for Downlink Multi-User MIMO Transmission in Next Generation WLAN," The IEEE Consumer Communications and Networking Conference, pp.832-837, 2012.
  5. Elli Kartsakli, Nizar Zorba, Luis Alonso and Christos V. Verikoukis, "A Threshold-Selective Multiuser Downlink MAC Scheme for 802.11n Wireless Networks,"IEEE Transactions on Wireless Communications, Vol.10, No.3, 2011.
  6. Elli Kartsakli, Nizar Zorba, Luis Alonso and Christos V. Verikoukis, "Multiuser MAC Protocols for 802.11n Wireless Networks,"IEEE International Conference on Communications(IEEE ICC 2009), 2009.
  7. Charfi, E., Chaari, L. and Kamoun, L. "PHY/MAC Enhancements and QoS Mechanisms for Very High Throughput WLANs: A Survey," The IEEE Communications Surveys & Tutorials, Issue(99), pp.1-22, 2013.
  8. Haitao Wu, Wang, A., Qian Zhang, Xuemin Shen, "IEEE 802.11e Enhanced Distributed Channel Access (EDCA) Throughput Analysis," IEEE Transactions on Wireless Communications, 2007.
  9. IEEE $P802.11ac^{TM}/D3.0$, Draft STANDARD for Wireless LAN Medium Access Control (MAC) and Physical Layer(PHY) specifications Amendment 4: Enhancements for Very High Throughput for Operation in Bands below 6 GHz, 2013.
  10. IEEE Std $802.11ac^{TM}$ IEEE Standard for Information technology -- Telecommunications and information exchange between systems Local and metropolitan area networks--Specific requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications, 2013.
  11. J.S.Lee, M.H.Cheong, S.K.Lee, "802.11ac wireless LAN Technology", Korea Information and Communications Society, v.30 no.6, pp.13-19, 2013.
  12. Wai Leong Pang, David Chieng and Nurul Nadia Ahmad, "Adaptive Priority Sliding Admission Control and Scheduling Scheme for DCF and EDCA WLANs," Wireless Personal Communications, Volume 70, Issue(1), pp.295-321, 2013. https://doi.org/10.1007/s11277-012-0695-2
  13. Michelle X. Gong, Eldad Perahia, Robert Stacey, Roy Want and Shiwen Mao, "A CSMA/CA MAC Protocol for Multi-User MIMO Wireless LANs," Global Telecommunications Conference(IEEE GLOBECOM 2010), 2010.
  14. Michelle X. Gong, Eldad Perahia, Roy Want and Shiwen Mao,"Training Protocols for Multi-User MIMO Wireless LANs," 2010 IEEE 21st International Symposium on Personal Indoor and Mobile Radio Communications(PIMRC), 2010.
  15. Aboul-Magd, O., Uikun Kwon, Youngsoo Kim, Chunhui Zhu, "Managing Downlink MU-MIMO Transmission Using Group Membership," IEEE Consumer Communications and Networking Conference (CCNC), 2013.