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Submission doc.: IEEE 802.11-14/1397r0 Month Year Myeong-Jin Kim, Korea UniversitySlide 1 Discussion on Frame Structure for Future WLAN Systems with OFDMA.

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Presentation on theme: "Submission doc.: IEEE 802.11-14/1397r0 Month Year Myeong-Jin Kim, Korea UniversitySlide 1 Discussion on Frame Structure for Future WLAN Systems with OFDMA."— Presentation transcript:

1 Submission doc.: IEEE 802.11-14/1397r0 Month Year Myeong-Jin Kim, Korea UniversitySlide 1 Discussion on Frame Structure for Future WLAN Systems with OFDMA Date: 2014-10-31 Authors:

2 Submission doc.: IEEE 802.11-14/1397r0 Month Year Myeong-Jin Kim, Korea UniversitySlide 2 Abstract This contribution discusses on frame structure of OFDMA in HEW to enhance the efficiency of WLAN systems.

3 Submission doc.: IEEE 802.11-14/1397r0Month Year Myeong-Jin Kim, Korea UniversitySlide 3 OFDMA in HEW OFDMA is crucial technology for high efficient WLAN 802.11ax has considered OFDMA for efficient use of sp ectrum resources and spectral frequency reuse. In order to serve users having different link quality, the following TXVECTOR parameters should be considere d as user-specific values -MCS: indicates the modulation and coding scheme -NUM_STS: indicates the number of space-time streams -STBC: indicates whether STBC is used -FEC_CODING: indicates which FEC encoding is used How to determine user-specific values?

4 Submission doc.: IEEE 802.11-14/1397r0Month Year Myeong-Jin Kim, Korea UniversitySlide 4 UL MU Transmission in HEW 802.11ax has discussed UL MU transmission and issues to support UL MU transmission. Issue on synchronization for UL MU transmission -Time synchronization -Frequency synchronization -Power synchronization Solution(s) for synchronization in UL MU transmission -Longer CP size -Adjustment procedure for synchronization -UL MU only for STAs who are sufficiently synchronized Another solution with OFDMA?

5 Submission doc.: IEEE 802.11-14/1397r0Month Year Myeong-Jin Kim, Korea UniversitySlide 5 Frame Structure Example to Solve Previous Mentioned Problems Proposed frame structure with OFDMA - To assign control channel which is separated from data subchannels Subcarrier logical number OFDMA symbol number Control subchannel Data subchannel

6 Submission doc.: IEEE 802.11-14/1397r0Month Year Myeong-Jin Kim, Korea UniversitySlide 6 Conclusion We discussed frame structure of OFDMA to enhance ef ficiency in HEW. In order to serve users having different link quality and support UL MU transmission, we need to discuss fram e structure of OFDMA. We introduced a example of OFDMA frame structure.

7 Submission doc.: IEEE 802.11-14/1397r0Month Year Myeong-Jin Kim, Korea UniversitySlide 7 References [1] IEEE 802.11-13/1382r0, "Discussion on OFDMA in HEW" [2] IEEE 802.11-14/1210r1, "HEW PPDU Format for Supporting MIMO-OFDMA" [3] IEEE 802.11-13/1388r1, "Uplink Multi-User Transmission“ [4] IEEE 802.11-14/0802r0, "Consideration on UL MU Transmission“

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