Limitation of EDCA/HCCA for Video Transmission

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Presentation transcript:

Limitation of EDCA/HCCA for Video Transmission July 2007 doc.: IEEE 802.11-07/xxxxr0 July 2007 Limitation of EDCA/HCCA for Video Transmission Date: 2007-07-18 Authors: 0:15 Notice: This document has been prepared to assist IEEE 802.11. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.11. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures <http:// ieee802.org/guides/bylaws/sb-bylaws.pdf>, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair stuart@ok-brit.com as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.11 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at <patcom@ieee.org>. Akira Yamada, NTT DoCoMo, Akira Yamada, NTT DoCoMo.

July 2007 doc.: IEEE 802.11-07/xxxxr0 July 2007 Abstract This presentation shows typical functional limitations of existing MAC protocols (EDCA and HCCA) for Video transmission 0:15 0:30 Akira Yamada, NTT DoCoMo, Akira Yamada, NTT DoCoMo.

HCCA issue : Cell Overlapping July 2007 doc.: IEEE 802.11-07/xxxxr0 July 2007 HCCA issue : Cell Overlapping HCCA parameters are configured in each HCs CFP / CP may differ among HCs [1] If CFP/CP differ between AP1 and AP2, packets may collide in cell overlapping area due to lack of inter-HC coordination Control access phase 1:00 1:30 Akira Yamada, NTT DoCoMo, Akira Yamada, NTT DoCoMo.

EDCA Issue : Packet collision with large number of STAs in same AC July 2007 doc.: IEEE 802.11-07/xxxxr0 July 2007 EDCA Issue : Packet collision with large number of STAs in same AC Prioritization access for RT traffic is realized by shorter AIFSN/CWmin than those of Non-RT traffic in EDCA (Video) AIFSN = 2, CWmin = 7, (Voice) AIFSN = 2, CWmin = 3 Large number of STAs that belong to same AC makes higher collision probability by shorter CWmin! Simulation : Effect of shorter CWmin Topology 2min 802.11a 24Mbps / Only UL traffic / 12 STAs CWmin : 3 CWmin : 7 CWmin : 15 Smaller CWmin increases packet collisions and retransmissions Lower throughput Large end-to-end delay Akira Yamada, NTT DoCoMo, Akira Yamada, NTT DoCoMo.

EDCA issue : Limited support of AC_VI July 2007 EDCA issue : Limited support of AC_VI EDCA defines four types of ACs AC_VO, AC_VI, AC_BE, AC_BK Video transmissions can be categorized to some types (e.g. ITU-T document [2]) Conversational Voice and Video (Video Phone/Bidirectional) Duplex system Carrying both voice and video Delay sensitive Streaming audio/video (One-way video) No duplex Not so stringent requirement for delay Akira Yamada, NTT DoCoMo,

EDCA Issue : Limited support of AC_VO (Cont.) July 2007 EDCA Issue : Limited support of AC_VO (Cont.) However those applications have different performance targets for delay [3] Video Phone : < 150 ms (Preferred) , <400 ms (Limit), <1% PLR Streaming audio/video : < 10s, <1% PLR In IEEE802.11e (EDCA), those two types of video are assumed to belong to same AC Impossible to prioritize Video-phone by EDCA Different Requirement for Delay Figure 1/G.1010 – Mapping of user-centric QoS requirements Akira Yamada, NTT DoCoMo,

Possible Approach for VTS-MAC July 2007 Possible Approach for VTS-MAC HCCA issue: Lack of inter-AP coordination High complexity QoS Scheme Intserv HCCA VTS-MAC Lower complexity than HCCA More effective QoS than EDCA VTS-MAC? Low High Complexity EDCA EDCA issue: Packet collision with small CWmin Limited support of AC_VI Diffserv Akira Yamada, NTT DoCoMo,

Summary Functional limitations in existing WLAN MAC protocols July 2007 Summary Functional limitations in existing WLAN MAC protocols HCCA issue Severe packet collision due to lack of Inter-AP Coordination EDCA issue Packet collision with large number of STAs Cannot support multiple types of Video communication Possible approach for VTS-MAC Lower complexity than HCCA More effective QoS than EDCA Akira Yamada, NTT DoCoMo,

Reference [1] IEEE802.11e Standard July 2007 Reference [1] IEEE802.11e Standard [2] ITU-T G.1010 End-user multimedia QoS categories Akira Yamada, NTT DoCoMo,