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Doc.: IEEE 802.11-11/1489r0 Submission Nov. 2011 Heejung Yu, ETRISlide 1 Green-Field 11ac Packet for TGah Date: 2011-11-06 Authors:

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Presentation on theme: "Doc.: IEEE 802.11-11/1489r0 Submission Nov. 2011 Heejung Yu, ETRISlide 1 Green-Field 11ac Packet for TGah Date: 2011-11-06 Authors:"— Presentation transcript:

1 doc.: IEEE 802.11-11/1489r0 Submission Nov. 2011 Heejung Yu, ETRISlide 1 Green-Field 11ac Packet for TGah Date: 2011-11-06 Authors:

2 doc.: IEEE 802.11-11/1489r0 Submission Nov. 2011 Heejung Yu, ETRISlide 2 Abstract In this submission, the 11ac greed field format for IEEE 802.11ah PHY is proposed with the similar approach in 802.11n.

3 doc.: IEEE 802.11-11/1489r0 Submission Backgound The down-clocked version of 11ac is considered as the most possible candidate for 11ah. 11ah devices operate in sub 1GHz channels. There is no legacy devices like 11a/b/g/n. Therefore, we do not need to consider the backward compatibility with legacy devices. Unlike 11n, 11ac considers only mixed mode format with L-STF, L-LTF, L-SIG. To improve the efficiency, the greed field format should be included for 11ah without considering backward compatibility. Sept. 2011 Heejung Yu, ETRISlide 3

4 doc.: IEEE 802.11-11/1489r0 Submission GF format in 11n 11n mixed mode format 11n greenfield format –Reduced packet overhead Nov. 2011 Heejung Yu, ETRISlide 4 Legacy part

5 doc.: IEEE 802.11-11/1489r0 Submission Frame format in 11ac The current 11ac packet L-STF, L-LTF, L-SIG are not needed. If MU-MIMO is not necessary in 11ah, VHT-SIG B is not needed. Since the maximum N sts is 4, we can save one bit in VHT-SIG A. –With this saved bit and reserved bits, the additional transmission technique for range extension can be indicated. Nov. 2011 Heejung Yu, ETRISlide 5

6 doc.: IEEE 802.11-11/1489r0 Submission GF format for 11ah (1) GF format Nov. 2011 Heejung Yu, ETRISlide 6 If MU-MIMO is not considered, it is not included. The bit allocation can be modified. -Max N sts = 4. -More MSC indication for adopting some range extension technique.

7 doc.: IEEE 802.11-11/1489r0 Submission GF format for 11ah (2) In most use cases, the packet size may be small. Therefore, the reduction of pakcet overhead is significant in terms of efficiency. Nov. 2011 Heejung Yu, ETRISlide 7

8 doc.: IEEE 802.11-11/1489r0 Submission Conclusions In this submission, we consider the GF 11ac frame format for 11ah PHY. 11ah do not consider the backward compatibility. With GF format, we can improve the system efficiency. Nov. 2011 Heejung Yu, ETRISlide 8

9 doc.: IEEE 802.11-11/1489r0 Submission Straw poll Do you support that the TGah frame structure is in the form of green field format without consideration of backward compatibility? Y/N/A : 16 / 0 /32 Nov. 2011 Heejung Yu, ETRISlide 9

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